JP2010008018A - Heat exchange pipe with inner fin and heat exchanger using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchange pipe with an inner fin, preventing the occurrence of brazing failure in brazing to a header tank. <P>SOLUTION: This heat exchange pipe 12 with an inner fin includes: a flat pipe body 20; and one corrugated inner fin 22 including wave crest parts 28, wave bottom parts 29, 29A and connecting parts 31 connecting the wave crest parts 28 and the wave bottom parts 29, 29A. The pipe body 20 includes: one lower wall 23; two upper walls 24 having a width smaller than that of the lower wall 23 and opposite to the lower wall 23; a connecting wall 25 connecting both side edges of the lower wall 23 and one side edge of each upper wall 24; a projecting wall 26 provided on the other side edge of each upper wall 24 to project toward the lower wall 23 side; and a flat presser wall 27 provided on the forward edge of the projecting wall 26 to project toward the connecting wall 25 side. The inner fin 22 is brazed to the pipe body 20 in the state of being clamped between the lower wall 23 and the presser wall 27 of the pipe body 20. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a heat exchange pipe with an inner fin that is suitably used for an evaporator and a condenser of a car air conditioner that is a refrigeration cycle mounted on an automobile, for example, and a heat exchanger using the same.

  For example, as a heat exchange pipe with an inner fin used for an evaporator of a car air conditioner, a flat tube body having two fluid circulation parts arranged in the width direction, and a wave crest part, a wave bottom part, and a wave crest part and a wave bottom part are connected. And a corrugated inner fin disposed across both fluid circulation portions of the pipe body, and the pipe body is one first flat wall, approximately half the width of the first flat wall. And two second flat walls facing the first flat wall, connecting walls connecting both side edges of the first flat wall and one side edge of each second flat wall, and each second flat A protruding wall provided on the other side edge of the wall so as to protrude toward the first flat wall and having a tip edge separated from the inner fin, the first flat wall, the second flat wall, the connecting wall, A fluid circulation part is formed by the protruding wall, and one of the inner fins Min inner fin has been known one which is brazed to the pipe main body in a state of being sandwiched by both the projecting wall of the tube body (see Patent Document 1).

  The heat exchange tube with an inner fin described in Patent Document 1 is manufactured as follows. First, a first part that forms the first flat wall, a second part that has approximately half the width of the first part and forms two second flat walls, and the first part and both second parts Flat tube body manufacturing comprising two third parts that connect and form a connecting wall, and a fourth part that is provided on the side edge of each second part opposite to the third part and that forms a protruding wall Prepare a metal plate. Next, after bending the fourth portion of the metal plate vertically upward with respect to the second portion, an inner fin is placed on the first portion. A sandwiched portion is formed at the center in the width direction of the inner fin. Next, the metal plate is bent at both third portions, the sandwiched portions of the inner fins are sandwiched by the fourth portions, and the fourth portions are brought into close contact with each other via the sandwiched portions to obtain a bent body. . Thereafter, the bent body is heated to a predetermined temperature, the wave crest portion and wave bottom portion of the inner fin are brazed to the second portion and the first portion, and both the fourth portions are brazed to the sandwiched portion of the inner fin. In this way, a heat exchange tube with an inner fin composed of a tube main body composed of a first flat wall, two second flat walls, two connecting walls, and two protruding walls, and an inner fin is manufactured.

  The manufacture of the heat exchange pipe with an inner fin described in Patent Document 1 is performed by the following method simultaneously with the manufacture of the heat exchanger. That is, the two header tanks are arranged at intervals, and the above-described bent bodies and outer fins are alternately arranged. Next, both ends of the bent body are inserted into the tube insertion holes formed in both header tanks. Thereafter, all the parts are temporarily fixed by appropriate means, and the temporary fixing body is heated to a predetermined temperature, thereby manufacturing the heat exchange pipe with the inner fin from the bent body, the heat exchange pipe with the inner fin and both header tanks, The heat exchange tube with the inner fin and the outer fin, and the outer fin and the side plate are brazed simultaneously. Thus, a heat exchanger is manufactured.

However, in the heat exchange pipe with an inner fin described in Patent Document 1, the tip edge of the protruding wall of the pipe body is separated from the inner fin, and thus there are the following problems. That is, also in the bending body mentioned above for manufacturing the heat exchange tube with an inner fin described in Patent Document 1, the tip edge of the fourth portion is separated from the inner fin. Therefore, when the both ends of the bent body are inserted into the pipe insertion holes of the header tank, the second flat wall and the connecting wall until the leading edge of the protruding wall of the bent body comes into contact with the first flat wall via the inner fin. Is deformed, and the protruding wall side portions of both the second flat walls of the bent body are deformed inward in the height direction. Therefore, a gap is formed between the peripheral edge portion of the pipe insertion hole in the header tank and the manufactured heat exchange pipe with inner fin, and the brazing property between the header tank and the heat exchange pipe with inner fin is lowered. Defects may occur.
JP 2003-302186 A

  An object of the present invention is to provide a heat exchange pipe with an inner fin and a heat exchanger using the same, which can solve the above-mentioned problems and prevent the occurrence of brazing failure when brazing with a header tank.

  In order to achieve the above object, the present invention comprises the following aspects.

1) It consists of a flat tube body having at least two fluid circulation parts arranged in the width direction, a wave crest part, a wave bottom part, and a connecting part that connects the wave crest part and the wave bottom part, and all fluid circulation parts of the pipe body It consists of one corrugated inner fin arranged across, and the tube body has one first flat wall, a width equal to or smaller than the width of the first flat wall, and at least a part thereof faces the first flat wall. Two second flat walls, a connecting wall that connects both side edges of the first flat wall and one side edge of each second flat wall, and a first flat on the other side edge of each second flat wall A heat exchange pipe with an inner fin in which a fluid circulation part is formed by a first flat wall, a second flat wall, a connecting wall, and a protruding wall.
A flat pressing wall protruding to the connecting wall side is provided at the leading edge of each protruding wall of the tube body, and the inner fin is sandwiched between the first flat wall and the pressing wall of the tube body, Heat exchange tube with inner fin brazed to the tube body.

  2) The side edges of the pipe body on the side where the projecting walls of both the second flat walls are abutted and the projecting walls are brazed to each other in a surface contact state. Heat exchange tube with inner fins.

  3) The heat exchange tube with an inner fin as described in 1) above, wherein a gap is provided between the projecting walls of the tube body.

  4) The heat exchange pipe with an inner fin as described in 3) above, wherein the width of the gap between the projecting walls of the pipe body is equal over the entire height of the gap.

  5) When the width of the gap between the projecting walls of the pipe body is Wmm and the height of the pipe body is Hmm, heat exchange with an inner fin as described in 4) above satisfying the relationship H / 2 ≦ W ≦ H. tube.

  6) The heat exchange pipe with an inner fin as described in 3) above, wherein the gap between the projecting walls of the pipe body is narrowed from the second flat wall side toward the first flat wall side.

  7) The heat exchange tube with an inner fin as described in 6) above, wherein the cross-sectional shape of the gap between the projecting walls of the tube body is V-shaped.

  8) When the width of the opening of the gap between the projecting walls of the pipe body is W1 mm, the height of the gap is Dmm, and the height of the pipe body is Hmm, H / 2 ≦ W1 ≦ H, H / 2 The heat exchange pipe with an inner fin as described in 7) above that satisfies the relationship ≦ D <H.

  9) A curved portion having an arc-shaped cross section that is curved outward in the width direction toward the outer side in the height direction of the pipe body is provided on the second flat wall side portion of both protruding walls of the pipe body. The heat exchange tube with an inner fin as described in 6) above, wherein a gap is formed between the curved portions of the protruding walls.

  10) When the width of the opening of the gap between the curved portions of the two protruding walls of the tube body is W1 mm, the radius of curvature of the outer surface of the curved portion is Rmm, and the height of the tube body is Hmm, H / 2 ≦ W1 The heat exchange pipe with an inner fin as described in 9) above that satisfies the relations of ≦ H and H / 2 ≦ R ≦ H.

  11) The heat exchange tube with an inner fin according to any one of the above 3) to 10), wherein a gap between the projecting walls of the tube main body is provided at a central portion in the width direction of the tube main body.

  12) The gap between the two protruding walls of the pipe body is provided so as to be biased to one side from the center in the width direction of the pipe body. Heat exchange tube with inner fins.

  13) At the intermediate portion in the width direction on the outer surface of the second flat wall of the pipe body, a concave groove is formed which is recessed toward the first flat wall by deforming the second flat wall, and the inner fin is the bottom of the concave groove. In a state of being sandwiched between the wall portion and the first flat wall, it is brazed to the bottom wall portion and the first flat wall of the concave groove, and the first flat wall, the second flat wall, 13. The heat exchange pipe with an inner fin according to any one of 1) to 12) above, wherein a fluid circulation part composed of a connecting wall and a protruding wall is divided into a plurality of parts.

  14) a pair of header tanks arranged at a distance from each other and a plurality of heat exchange pipes arranged between both header tanks and having both ends connected to both header tanks; However, the heat exchanger which consists of a heat exchange pipe | tube with an inner fin in any one of said 1) -13.

  15) Each header tank is arranged side by side in the ventilation direction, and has header sections connected to each other. A heat exchange pipe is arranged between the header sections of both header tanks, and the header section The heat exchanger as described in 14) above, which is communicated with the heat exchanger.

  16) A pair of header tanks arranged at a distance from each other and a plurality of heat exchange pipes arranged between the header tanks and connected at both ends to the header tanks. Are arranged side by side in the ventilation direction and have header parts connected to each other, and the heat exchange pipe is composed of a heat exchange pipe with an inner fin as described in 11) above. Two fluid circulation portions are provided, a notch is formed in a portion existing in a gap between the protruding walls at both ends in the length direction of the first flat wall of the tube body, and the two fluid circulations in the tube body Both end portions in the length direction of the portion where the portion is provided protrude beyond the portion present in the gap between the protruding walls of the first flat wall, and both fluid circulation portions of the pipe body are respectively Header of header tank Heat exchanger that is vented into the header portion together is disposed between.

  The heat exchange pipe with inner fin of 1) above is provided with a flat pressing wall protruding toward the connecting wall at the tip edge of each protruding wall of the pipe body, and the inner fin is the first flat wall of the pipe body. Since it is brazed to the pipe body in a state of being sandwiched by the pressing wall, it is manufactured as follows. That is, a first part that forms the first flat wall, a second part that has approximately half the width of the first part and that forms two second flat walls, and the first part and both second parts Two third parts that connect and form a connecting wall, a fourth part that is provided on a side edge of each second part opposite to the third part and that forms a protruding wall, and a second part in the fourth part A flat metal plate for manufacturing a pipe body is prepared, which is provided on a side edge opposite to the portion and includes a fifth portion that forms a pressing wall. Next, the fifth portion of the metal plate is bent at a right angle upward with respect to the fourth portion, and the fourth portion is bent at a right angle upward with respect to the second portion, and then made of an aluminum bare material on the first portion. Place the inner fin. Next, the metal plate is bent at both third portions, the side edges where the fourth portions of the second portions are formed are brought into contact with each other, the fourth portions are brought into close contact with each other, and both the fifth portion and the first portion are By sandwiching the inner fin, a bent body is obtained. Thereafter, the bent body is heated to a predetermined temperature, both the fourth portions are brazed to each other, the wave crest portion and the wave bottom portion of the inner fin are brazed to the second portion and the first portion, and the inner fin is further moved to the first portion. And brazing the fifth part. In this way, the heat exchange tube with inner fins of the above 1) is manufactured. The production of the heat exchange pipe with inner fins of 1) is performed as follows simultaneously with the production of the heat exchanger. That is, the two header tanks are arranged at intervals, and the above-described bent bodies and outer fins are alternately arranged. Next, both ends of the bent body are inserted into the tube insertion holes formed in both header tanks. Thereafter, all the parts are temporarily fixed by appropriate means, and the temporary fixing body is heated to a predetermined temperature, thereby manufacturing the heat exchange pipe with the inner fin from the bent body, the heat exchange pipe with the inner fin and both header tanks, The heat exchange tube with the inner fin and the outer fin, and the outer fin and the side plate are brazed simultaneously. Thus, a heat exchanger is manufactured.

  According to the heat exchange pipe with inner fins of 1) above, a flat pressing wall protruding to the connecting wall side is provided at the tip edge of each protruding wall of the pipe body, and the inner fin is connected to the pipe body. Since it is brazed to the pipe body in a state of being sandwiched between the first flat wall and the presser wall, the fifth part forming the presser wall is interposed via the inner fin even in the state of the bent body described above. It abuts on the first part forming the first flat wall. Therefore, when the end of the bent body is inserted into the pipe insertion hole of the header tank, the second portion forming the second flat wall and the third portion forming the connecting wall are prevented from being deformed. It is prevented that the fourth portion side portion is deformed so as to be recessed inward in the height direction. As a result, a gap does not occur between the peripheral portion of the pipe insertion hole in the header tank and the bent body, and the occurrence of brazing failure during brazing with the header tank due to the gap is prevented. Further, even in the state of the folded body described above, the inner fin is sandwiched between the first portion that forms the first flat wall and the fifth portion that forms the pressing wall. It is possible to prevent the displacement of the inner fin when inserted into the pipe insertion hole of the tank. Therefore, the strength reduction of the heat exchange tube with the inner fin after brazing is prevented.

  According to the heat exchange pipe with inner fins of 3) above, since a gap is provided between the projecting walls of the pipe body, when this heat exchange pipe with inner fins is used for an evaporator of a car air conditioner, It becomes possible to drain condensed water using the gap.

  According to the heat exchange pipe with inner fins of 5) above, in the heat exchange pipe with inner fins of 4) above, the width of the gap between the projecting walls of the pipe body is equal over the entire height of the gap. When the width of the gap between the projecting walls of the pipe body is Wmm and the height of the pipe body is Hmm, the relationship H / 2 ≦ W ≦ H is satisfied. When used in an evaporator, the condensed water can be effectively drained using the gap.

  According to the heat exchange pipe with inner fins of 6) above, the gap between the projecting walls of the pipe body is narrowed from the second flat wall side to the first flat wall side. When the heat exchange pipe is used in an evaporator of a car air conditioner, the drainage of condensed water using the gap is further improved.

  According to the heat exchange pipe with an inner fin of the above 8), in the heat exchange pipe with an inner fin of the above 7), the cross-sectional shape of the gap between the projecting walls of the pipe body is V-shaped. When the width of the opening of the gap between the two protruding walls is W1 mm, the height of the gap is Dmm, and the height of the pipe body is Hmm, H / 2 ≦ W1 ≦ H and H / 2 ≦ D <H. Since the relationship is satisfied, when this heat exchange pipe with an inner fin is used in an evaporator of a car air conditioner, it becomes possible to effectively drain condensed water using the gap.

  According to the heat exchange pipe with inner fins of 10) above, the cross-section curved outward in the width direction toward the outside in the height direction of the pipe body at the second flat wall side portion of the both protruding walls of the pipe body In the heat exchange pipe with an inner fin as described in 9) above, in which an arc-shaped curved portion is provided and a gap is formed between the curved portions of both projecting walls, When the width of the opening between the gaps is W1 mm, the radius of curvature of the outer surface of the curved portion is Rmm, and the height of the tube body is Hmm, the relationship of H / 2 ≦ W1 ≦ H and H / 2 ≦ R ≦ H Therefore, when this heat exchange pipe with an inner fin is used for an evaporator of a car air conditioner, condensed water can be effectively drained using the gap.

  According to the heat exchange pipe with inner fins of the above 13), it is possible to effectively prevent displacement when the end portion of the heat exchange pipe with inner fins is inserted into the pipe insertion hole of the header tank.

  According to the heat exchangers of 14) to 16), the same effects as described in the heat exchange pipe with inner fins of 1) are obtained.

  According to the heat exchanger of 16), the number of parts is reduced as compared with the case where separate heat exchange tubes are arranged between the header portions of both header tanks.

  Embodiments of the present invention will be described below with reference to the drawings. In the embodiment described below, the heat exchanger according to the present invention is applied to an evaporator of a car air conditioner using a chlorofluorocarbon refrigerant.

  In the following description, the term “aluminum” includes aluminum alloys in addition to pure aluminum.

  In the following description, regarding the evaporator using the heat exchange pipe with inner fins, the downstream side of the air flowing in the ventilation gap between adjacent heat exchange pipes with inner fins (direction indicated by arrow X in FIG. 1) 1 is referred to as the front, the opposite side is referred to as the rear, and the top and bottom and the left and right in FIG. Moreover, about the description regarding the heat exchange pipe | tube with an inner fin, and its manufacturing method, suppose that the upper and lower sides and right and left of FIGS. 3-9 and FIG.

  Moreover, the same code | symbol is attached | subjected to the same part and the same thing through all drawings, and the overlapping description is abbreviate | omitted.

Embodiment 1
This embodiment is shown in FIGS. FIG. 1 shows the whole structure of an evaporator using a heat exchange pipe with an inner fin according to the present invention, and FIG. 2 shows the structure of the main part of the evaporator. 3 and 4 show a heat exchange tube with an inner fin, and FIG. 5 shows a manufacturing method thereof.

  1 and 2, the evaporator (1) includes an aluminum refrigerant inlet / outlet header tank (2) and an aluminum refrigerant turn header tank (3) that are spaced apart in the vertical direction, and both header tanks ( 2) A heat exchange core section (4) provided between (3).

  The refrigerant inlet / outlet tank (2) is connected to the refrigerant inlet header (5) located on the front side (downstream in the ventilation direction) and the refrigerant inlet header (5) located on the rear side (upstream in the ventilation direction) And an integrated refrigerant outlet header (6). An aluminum refrigerant inlet pipe (7) is connected to the refrigerant inlet header section (5) of the refrigerant inlet / outlet tank (2), and an aluminum refrigerant outlet pipe (8) is also connected to the refrigerant outlet header section (6). Yes.

  The refrigerant turn header tank (3) includes a first intermediate header portion (9) located on the front side and a second intermediate header portion (on the rear side) connected and integrated with the first intermediate header portion (9). And 11).

  The heat exchange core section (4) includes a heat exchange pipe group (13) composed of a plurality of heat exchange pipes with inner fins (12) extending in the vertical direction and spaced apart in the horizontal direction. A plurality of rows, here two rows, are arranged outside the heat exchange tubes (12) at the left and right ends and between the heat exchange tubes (12) with adjacent inner fins in each heat exchange tube group (13). Aluminum corrugated outer fins (14) are placed so as to straddle the heat exchange tubes (12) with inner fins of the front and rear heat exchange tube groups (13), and brazed to the heat exchange tubes (12) with inner fins. The aluminum side plates (15) are respectively arranged outside the outer fins (14) at the left and right ends and brazed to the outer fins (14).

  The heat exchange pipes (12) with inner fins in the front heat exchange pipe group (13) are the refrigerant inlet header part (5) of the refrigerant inlet / outlet header tank (2) and the first intermediate header part of the refrigerant turn header tank (3). (9), and both upper and lower end portions thereof are pipe insertion holes (not shown) formed in the refrigerant inlet header portion (5) of the refrigerant inlet / outlet header tank (2) and the refrigerant turn header tank ( It is inserted into a pipe insertion hole (16) formed in the first intermediate header portion (9) of 3) and brazed to both header tanks (2) and (3). The heat exchange pipe (12) with inner fins in the rear heat exchange pipe group (13) is a refrigerant outlet header section (6) of the refrigerant inlet / outlet header tank (2) and a second intermediate header of the refrigerant turn header tank (3). The upper and lower end portions are arranged between the pipe insertion hole (not shown) and the refrigerant turn header tank formed in the refrigerant outlet header part (5) of the refrigerant inlet / outlet tank (2). It is inserted into a pipe insertion hole (16) formed in the second intermediate header portion (9) of (3) and brazed to both header tanks (2) and (3).

  The heat exchange pipe (12) with an inner fin is disposed across the flat aluminum pipe body (20) having two fluid circulation sections (21) and both fluid circulation sections (21) of the pipe body (20). And a single aluminum corrugated inner fin (22).

  As shown in detail in FIG. 3 and FIG. 4, the pipe body (20) of the heat exchange pipe (12) with the inner fin is composed of one lower wall (23) (first flat wall) and lower wall (23). Two upper walls (24) (second flat wall) that have approximately half the width (width less than or equal to the width) and face the lower wall (23) as a whole, and the central part in the vertical direction is outward in the horizontal direction A connecting wall (25) having a protruding arc-shaped cross-sectional shape and integrally connecting the left and right side edges of the lower wall (23) and the left and right outer edges of each upper wall (24); A protruding wall (26) that is integrally provided on the inner edge of the upper wall (24) in the left-right direction so as to be perpendicular to the upper wall (24) and protrudes toward the lower wall (23), and each protruding wall (26) And a flat pressing wall (27) which is provided integrally with the protruding wall (26) so as to be perpendicular to the front end edge thereof and protrudes outward in the left-right direction (on the connecting wall (25) side). The side edges of the upper side wall (24) of the pipe body (20) on the inner side in the left-right direction (the side where the projecting wall (26) is provided) are abutted with each other, and both projecting walls (26) are in surface contact. Are brazed to each other.

  The inner fin (22) includes a flat wave crest (28), a flat wave bottom (29), and a connecting portion (31) that connects the wave crest (28) and the wave bottom (29). The width of the wave bottom at the center in the left-right direction of the inner fin (22) is larger than the width of the other wave bottom (29) and the wave crest (28). The wide wave bottom is indicated by (29A). The width of the wide wave bottom (29A) is equal to or greater than the total width of the two holding walls (27) of the tube body (20). In addition, the widths of the wave bottom part (29) and the wave crest part (28) other than the wide wave bottom part (29A) of the inner fin (22) are equal.

  Then, in the state where the wide wave bottom (29A) of the inner fin (22) is sandwiched between the lower wall (23) and the holding wall (27) of the pipe body (20), the inner fin (22) 20) is brazed. That is, the wave bottom (29) is brazed to the lower wall (23), the wide wave bottom (29A) is brazed to the lower wall (23) and the holding wall (27), and the wave crest (28) is brazed to the upper wall (24). Has been. Further, the protruding walls (26) of the pipe body (20) are brazed together.

  Hereinafter, the manufacturing method of the heat exchange pipe | tube (12) with an inner fin is demonstrated with reference to FIG.

  First, a flat metal plate (35) for manufacturing a tube body made of an aluminum brazing sheet having a brazing filler metal layer on both sides as shown in FIG. 5 (a) is prepared. The metal plate (35) has one first part (36) that forms the lower wall (23) and approximately half the width of the first part (36) and forms two upper walls (24). A second portion (37), two third portions (38) that connect the first portion (36) and both second portions (37) and form a connecting wall (25), and each second portion ( A fourth portion (39) provided on a side edge opposite to the third portion (38) in 37) and forming a protruding wall (26); a second portion (37) in the fourth portion (39); Consists of a fifth part (41) which is provided on the opposite side edge and forms a pressing wall (27).

  Next, the fifth portion (41) of the metal plate (35) is bent upward at a right angle with respect to the fourth portion (39) (see FIG. 5 (b)), and the fourth portion (39) is turned into the second portion ( Bend upward at a right angle to 37) (see Fig. 5 (c)).

  Next, after placing an inner fin (22) made of an aluminum bare material on the first portion (36), the metal plate (35) is bent at both third portions (38) (FIGS. 5D and 5E). The side edges of the second portions (37) where the fourth portions (39) are formed are brought into contact with each other, the fourth portions (39) are brought into close contact with each other, and the fifth portions (41) and The wide wave bottom part (29A) of the inner fin (22) is sandwiched by the one part (36) to obtain a bent body (42) (see FIG. 5 (f)).

  Thereafter, the bent body (42) is heated to a predetermined temperature, and the brazing material layer of the metal plate (35) is used to braze both the fourth portions (39), and the wave of the inner fin (22). The top part (28) and the wave bottom part (29) are brazed to the second part (37) and the first part (36), and the wide wave bottom part (29A) of the inner fin (22) is joined to the first part (36) and Brazing the fifth part (41). Thus, the pipe body (20) comprising the lower wall (23), the two upper walls (24), the two connecting walls (25), the two protruding walls (26), and the two pressing walls (27), and the inner A heat exchange pipe (12) with an inner fin composed of the fin (22) is manufactured.

  The heat exchange pipe (12) with the inner fin is manufactured by the method described below simultaneously with the manufacture of the evaporator (1) shown in FIG. That is, the refrigerant inlet / outlet header tank (2) and the refrigerant turn header tank (3) are arranged at intervals. In addition, the bent bodies (42) and the outer fins (14) described above are alternately disposed, and the side plates (15) are disposed outside the outer fins (14) at both ends.

  Next, both ends of the bent body (42) are inserted into the pipe insertion holes (16) formed in the refrigerant inlet / outlet header tank (2) and the refrigerant turn header tank (3). At this time, the wide wave bottom part (29A) of the inner fin (22) is formed by the first part (36) of the bent body (42) (the part which becomes the first flat wall of the pipe body (20)) and the fifth part (41). ) (The portion to be the holding wall (27)), the fifth portion (41) is in contact with the first portion (36) via the inner fin (22). . Therefore, when the end of the bent body (42) is inserted into the pipe insertion hole (16) of both header tanks (2) and (3), the second portion (37) (the portion that becomes the second flat wall) and The deformation of the third part (38) (the part that becomes the connecting wall (25)) is prevented, and the part on the fourth part (39) (the part that becomes the protruding wall (26)) side of both the second parts (37) It is prevented from being deformed so as to be recessed inward in the tube height direction. As a result, it is possible to prevent a gap from being generated between the peripheral portion of the pipe insertion hole (16) and the bent body (42) in both header tanks (2) and (3). Further, the inner fin (22) includes a first portion (36) of the bent body (42) (a portion that becomes the first flat wall of the pipe body (20)) and a fifth portion (41) (the pressing wall (27)). To prevent misalignment when inserting the end of the bent body (42) into the pipe insertion holes (16) of both header tanks (2) (3). it can.

  Thereafter, all the parts are temporarily fixed by appropriate means, and the temporary fixing body is heated to a predetermined temperature, thereby producing the heat exchange pipe (12) with the inner fin from the bent body (42) as described above. , Heat exchange pipe with inner fin (12) and both header tanks (2) (3), heat exchange pipe with inner fin (12) and outer fin (14), outer fin (14) and side plate (15) Are brazed at the same time. Thus, the evaporator (1) is manufactured.

  When the evaporator (1) is manufactured, the heat exchange pipe with an inner fin (due to the gap generated between the peripheral edge of the pipe insertion hole (16) and the bent body (42) in both header tanks (2) (3) ( The occurrence of poor brazing between 12) and both header tanks is prevented. Further, it is possible to prevent displacement of the inner fin (22) when the end of the bent body (42) is inserted into the pipe insertion hole (16) of both header tanks (2) (3). The strength reduction of the heat exchange pipe (12) with the inner fin after attachment is prevented.

Embodiment 2
This embodiment is shown in FIG.

  As shown in FIG. 6, in the case of the heat exchange pipe (50) with the inner fin of the second embodiment, the width of the upper wall (24) of the pipe body (51) is the heat exchange pipe (12) with the inner fin of the first embodiment. The width of the upper wall (24) of the pipe body (20) is narrower, and a gap (52) is formed between the left and right inner edges of the upper wall (24) and the protruding walls (26). ing. The gap (52) is formed at the center in the width direction of the pipe body (51). The width of the wide wave bottom (29A) of the inner fin (22) is wider than the width of the wide wave bottom (29A) of the inner fin (22) of the heat exchange pipe (50) with the inner fin of the first embodiment. ing.

  The width of the gap (52) between the projecting walls (26) of the pipe body (51) is the same over the entire height of the gap (52). When the width of the gap (52) is Wmm and the height of the tube body (51) is Hmm, it is preferable that the relationship of H / 2 ≦ W ≦ H is satisfied.

  Other configurations are the same as those of the heat exchange pipe (50) with the inner fin of the first embodiment.

  When the heat exchange pipe with inner fin (50) of Embodiment 2 is used in the evaporator (1) shown in FIG. 1, the condensed water generated in the outer fin (14) enters the gap (52), and the gap ( 52) The drainage will be improved because it will flow down.

Embodiment 3
This embodiment is shown in FIG.

  As shown in FIG. 7, in the case of the heat exchange pipe (55) with an inner fin of this embodiment, the width of one upper wall (24) of the pipe body (56) is larger than the width of the other upper wall (24). The gap (52) between the projecting walls (26) of the pipe main body (56) is shifted in the width direction from the center in the width direction of the pipe main body (56). Other configurations are the same as those of the heat exchange pipe (50) with the inner fin of the second embodiment.

  When the heat exchange pipe with inner fin (55) of Embodiment 3 is used in the evaporator (1) shown in FIG. 1, the condensed water generated in the outer fin (14) enters the gap (52) and enters the gap ( 52) The drainage will be improved because it will flow down. The position of the gap (52) is determined to be an optimal position in order to improve the drainage of the condensed water generated in the outer fin (14).

Embodiment 4
This embodiment is shown in FIG.

  As shown in FIG. 8, in the case of the heat exchange pipe (60) with an inner fin of this embodiment, each projecting wall (26) of the pipe body (61) extends from the upper wall (24) side to the lower wall (23) side. The lower end portions (tip portions) are in contact with each other. Therefore, it narrowed from the upper wall (24) side to the lower wall (23) side between the left and right inner edges of the upper wall (24) of the pipe body (61) and the protruding walls (26). A gap (62) having a width is formed. When the width of the opening of the gap (62) is W1 mm and the height of the pipe body (61) is Hmm, it is preferable that the relationship of H / 2 ≦ W1 ≦ H is satisfied.

  Other configurations are the same as those of the heat exchange pipe (50) with the inner fin of the second embodiment.

  When the heat exchange pipe (60) with inner fins of Embodiment 4 is used in the evaporator (1) shown in FIG. 1, the condensed water generated in the outer fin (14) enters the gap (62) and enters the gap ( 62) The drainage will be improved because it will flow down.

  In addition, in the case of the heat exchange pipe (60) with inner fins of the fourth embodiment, similarly to the heat exchange pipe (55) with inner fins of the third embodiment, the distance between the two protruding walls (26) of the pipe body (61) is reduced. The gap (62) may be formed so as to be shifted in the width direction from the center portion in the width direction of the pipe body (61).

Embodiment 5
This embodiment is shown in FIG.

  As shown in FIG. 9, in the case of the heat exchange pipe (75) with an inner fin of this embodiment, the upper part (the height of the pipe main body (76) is formed on the upper part of both projecting walls (26) of the pipe main body (76). A curved portion (77) having an arcuate cross section that is curved outward in the left-right direction (outward in the width direction of the pipe body (76)) is provided. Therefore, between the left and right inner edges of the upper wall (24) of the pipe body (76) and the curved portions (77) of both protruding walls (26), the upper wall (24) side to the lower wall (23) A gap (78) having a width that narrows toward the side is formed. When the width of the opening of the gap (78) is W1 mm, the radius of curvature of the outer surface of the curved portion (77) is Rmm, and the height of the pipe body (76) is Hmm, H / 2 ≦ W1 ≦ H, H / 2 It is preferable that the relationship of ≦ R ≦ H is satisfied. The lower portions excluding the curved portions (77) of the projecting walls (26) of the pipe body (76) are brazed to each other in a surface contact state.

  Other configurations are the same as those of the heat exchange pipe (12) with the inner fin of the first embodiment.

  When the heat exchange pipe with inner fin (75) of Embodiment 5 is used in the evaporator (1) shown in FIG. 1, the condensed water generated in the outer fin (14) enters the gap (78), and the gap ( 78) The drainage will be improved because it will flow down.

  In addition, in the case of the heat exchange pipe (75) with inner fins of the fifth embodiment, similarly to the heat exchange pipe (55) with inner fins of the third embodiment, the distance between the protruding walls (26) of the pipe body (76) The gap (78) may be formed so as to be shifted in the width direction from the center portion in the width direction of the pipe body (76).

Embodiment 6
This embodiment is shown in FIG.

  As shown in FIG. 10, in the case of the heat exchange pipe (80) with inner fins of this embodiment, the upper part of both protruding walls (26) of the pipe body (81) is inclined outward in the left-right direction. An inclined portion (82) is provided. Accordingly, between the left and right inner edges of the upper wall (24) of the pipe body (81) and between the inclined portions (82) of both protruding walls (26), the upper wall (24) side to the lower wall (23) A gap (83) having a width narrowed toward the side is formed. When the width of the opening of the gap (83) is W1 mm, the height of the gap (83) is Dmm, and the height of the pipe body (81) is Hmm, H / 2 ≦ W1 ≦ H, H / 2 ≦ D < It is preferable that the relationship of H is satisfied. The lower portions excluding the inclined portions (82) of both projecting walls (26) of the pipe body (81) are brazed to each other in a surface contact state.

  When the heat exchange pipe with inner fin (80) of Embodiment 6 is used in the evaporator (1) shown in FIG. 1, the condensed water generated in the outer fin (14) enters the gap (83), and the gap ( 83) The drainage will be improved because it will flow down.

  In addition, in the case of the heat exchange pipe (80) with inner fins of the sixth embodiment, similarly to the heat exchange pipe (55) with inner fins of the third embodiment, the distance between the two protruding walls (26) of the pipe body (81) The gap (83) may be formed so as to be shifted in the width direction from the center portion in the width direction of the pipe body (81).

Embodiment 7
This embodiment is shown in FIG. 11 and FIG.

  As shown in FIGS. 11 and 12, in the case of the heat exchange pipe with inner fin (65) of this embodiment, the width of the pipe body (66) in the left-right direction is the same as that of the heat exchange pipe with inner fin of Embodiment 1 (12). 1 in the evaporator (1) shown in FIG. 1 provided with an inner fin on the upstream side in the ventilation direction and an inner fin on the downstream side in the ventilation direction (12) Is substantially equal to the distance between the downstream edge of the air flow direction. Therefore, the width in the left-right direction of the lower wall (23), the upper wall (24) and the gap (52), and the inner fin (22) of the pipe body (66) is the heat exchange pipe (50) with the inner fin of the second embodiment. This is wider than the width in the left-right direction of the lower wall (23), the upper wall (24) and the gap (52), and the inner fin (22). Further, the portion between the left and right fluid circulation portions (21) at both ends in the length direction of the lower wall (23) of the pipe body (66), that is, the left and right protruding walls at both ends in the length direction of the lower wall (23) ( 26) Notch (67) is formed in the portion existing in the gap (52) between the two, and the length direction of the portion where the two fluid circulation portions (21) are provided in the pipe body (66) Both end portions protrude from a portion of the lower wall (23) that exists in the gap (62) between the left and right protruding walls (26). The protrusion is indicated by (68).

  Other configurations are the same as those of the heat exchange pipe (50) with the inner fin of the second embodiment.

  The heat exchange pipe (65) with an inner fin according to the seventh embodiment allows ventilation in the width direction between the refrigerant inlet / outlet header tank (2) and the refrigerant turn header tank (3) of the evaporator (1) shown in FIG. The header tanks (2) and (3) are arranged so as to be aligned in a line at intervals in the length direction. Then, one end projecting portion (68) of the portion of the tube main body (66) where the one fluid circulation portion (21) is provided is formed in the inlet header portion (5) of the refrigerant inlet / outlet tank (2). A pipe inserted into the insertion hole and brazed to the refrigerant inlet / outlet header tank (2), and the other end protruding portion (68) is also formed in the first intermediate header portion (9) of the refrigerant turn header tank (3). It is inserted into the insertion hole (16) and brazed to the refrigerant turn header tank (3). In addition, a pipe formed in the outlet header portion (6) of the refrigerant inlet / outlet header tank (2) is formed at one end protruding portion (68) of the portion of the pipe body (66) where the other fluid circulation portion (21) is provided. A pipe inserted into the insertion hole and brazed to the refrigerant inlet / outlet header tank (2), and the other end protrusion (68) is also formed in the second intermediate header part (11) of the refrigerant turn header tank (3). It is inserted into the insertion hole (16) and brazed to the refrigerant turn header tank (3).

Embodiment 8
This embodiment is shown in FIG.

  As shown in FIG. 13, in the case of the heat exchange pipe (70) with an inner fin of this embodiment, an intermediate part in the width direction of the upper wall (24) constituting each fluid circulation part (21) in the pipe body (71). In addition, the upper wall (24) is deformed to form a concave groove (72) that is recessed toward the lower wall (23). Therefore, a part of the upper wall (24) faces the lower wall (23). Further, a wide wave bottom part (29B) wider than the other wave bottom part (29) is provided in the intermediate part in the width direction of the part existing in each fluid circulation part (21) of the inner fin (22). . Then, the wide wave bottom part (29B) present in each fluid circulation part (21) of the inner fin (22) is sandwiched between the bottom wall part (72a) and the lower wall (23) of the concave groove (72). In this state, it is brazed to the bottom wall portion (72a) and the lower wall (23) of the concave groove (72), and the lower wall (23), the upper wall (72b) by the both side wall portions (72b) of the concave groove (72). 24), each fluid circulation part (21) composed of the connecting wall (25) and the protruding wall (26) is divided into a plurality of, here two parts.

  Other configurations are the same as those of the heat exchange pipe (65) with inner fins of the seventh embodiment, and are used for the evaporator (1) in the same manner as the heat exchange pipe (65) with inner fins of the fifth embodiment.

  The heat exchange pipes with inner fins (50), (55), (60), (65), (70), (75), and (80) of Embodiments 2 to 8 are the same as the heat exchange pipes with inner fins of Embodiment 1 (12). It is manufactured in the same way.

  In the above embodiment, the heat exchange pipes (12) (50) (55) (60) (65) (70) (75) (80) with inner fins are used in the evaporator of a car air conditioner. It is not limited and can be used for capacitors and heater cores.

It is a partially-omission perspective view which shows the whole structure of the evaporator using the heat exchange pipe | tube with an inner fin of Embodiment 1 of this invention. It is an AA line expanded sectional view of FIG. It is a cross-sectional view which shows the heat exchange pipe | tube with an inner fin of Embodiment 1 of this invention. FIG. 4 is a partially enlarged view of FIG. 3. It is a figure which shows the one part process of the method of manufacturing the heat exchange pipe | tube with an inner fin of Embodiment 1 of this invention. It is a cross-sectional view which shows the heat exchange pipe | tube with an inner fin of Embodiment 2 of this invention. It is a cross-sectional view which shows the heat exchange pipe | tube with an inner fin of Embodiment 3 of this invention. It is a cross-sectional view which shows the heat exchange pipe | tube with an inner fin of Embodiment 4 of this invention. It is a cross-sectional view which shows the heat exchange pipe | tube with an inner fin of Embodiment 5 of this invention. It is a cross-sectional view which shows the heat exchange pipe | tube with an inner fin of Embodiment 6 of this invention. It is a cross-sectional view which shows the heat exchange pipe | tube with an inner fin of Embodiment 7 of this invention. FIG. 10 is a partially omitted perspective view of the heat exchange pipe with an inner fin shown in FIG. 9. It is a cross-sectional view which shows the heat exchange pipe | tube with an inner fin of Embodiment 8 of this invention.

Explanation of symbols

(1): Evaporator (heat exchanger)
(2): Header tank for refrigerant entry / exit
(3): Header tank for refrigerant turn
(5): Entrance header
(6): Exit header
(9): First intermediate header
(11): Second intermediate header
(12) (50) (55) (60) (65) (70) (75) (80): Heat exchange pipe with inner fin
(20) (51) (56) (61) (66) (71) (76) (81): Pipe body
(21): Fluid distribution department
(22): Inner fin
(23): Lower wall (first flat wall)
(24): Upper wall (second flat wall)
(25): Connecting wall
(26): Protruding wall
(27): Retaining wall
(28): Wave peak
(29) (29A) (29B): Wave bottom
(31): Connection part
(77): Curved part
(52) (62) (78) (83): Gap
(67): Notch
(72): Groove
(72a): Bottom wall
(72b): Side wall

Claims (16)

A flat tube main body having at least two fluid circulation portions arranged in the width direction, a wave crest portion, a wave bottom portion, and a connecting portion that connects the wave crest portion and the wave bottom portion, and spans all the fluid flow portions of the pipe main body. The corrugated inner fin is disposed, and the pipe body has two first flat walls, a width equal to or smaller than the width of the first flat wall, and at least a part thereof facing the first flat wall. The second flat wall, a connecting wall that connects both side edges of the first flat wall and one side edge of each second flat wall, and the other side edge of each second flat wall on the first flat wall side A heat exchange pipe with an inner fin in which a fluid circulation part is formed by a first flat wall, a second flat wall, a connecting wall, and a protruding wall.
A flat pressing wall protruding to the connecting wall side is provided at the leading edge of each protruding wall of the tube body, and the inner fin is sandwiched between the first flat wall and the pressing wall of the tube body, Heat exchange tube with inner fin brazed to the tube body. The inner fin according to claim 1, wherein the side edges of the pipe body on the side where the projecting walls are provided are abutted and the projecting walls are brazed to each other in a surface contact state. With heat exchange tube. The heat exchange tube with an inner fin according to claim 1, wherein a gap is provided between the projecting walls of the tube body. The heat exchange pipe with an inner fin according to claim 3, wherein the width of the gap between the projecting walls of the pipe body is equal over the entire height of the gap. The heat exchange tube with an inner fin according to claim 4, wherein the width of the gap between the projecting walls of the tube main body is Wmm and the height of the tube main body is Hmm, and the relationship of H / 2≤W≤H is satisfied. The heat exchange tube with an inner fin according to claim 3, wherein a gap between the projecting walls of the tube body is narrowed from the second flat wall side toward the first flat wall side. The heat exchange tube with an inner fin according to claim 6, wherein the cross-sectional shape of the gap between the projecting walls of the tube body is V-shaped. When the width of the opening of the gap between the projecting walls of the pipe body is W1 mm, the height of the gap is Dmm, and the height of the pipe body is Hmm, H / 2 ≦ W1 ≦ H, H / 2 ≦ D The heat exchange pipe with an inner fin according to claim 7, which satisfies the relationship <H. A portion of the both protruding walls of the tube body on the second flat wall side is provided with a curved portion having an arc-shaped cross section that is curved outward in the width direction toward the outside in the height direction of the tube body. The heat exchanger tube with an inner fin according to claim 6, wherein a gap is formed between the curved portions. When the width of the opening of the gap between the curved portions of the two protruding walls of the tube body is W1 mm, the radius of curvature of the outer surface of the curved portion is Rmm, and the height of the tube body is Hmm, H / 2 ≦ W1 ≦ The heat exchange tube with an inner fin according to claim 9, satisfying a relationship of H and H / 2 ≦ R ≦ H. The heat exchange tube with an inner fin according to any one of claims 3 to 10, wherein a gap between the projecting walls of the tube main body is provided at a central portion in the width direction of the tube main body. The gap between the projecting walls of the pipe body is provided with an inner fin according to any one of claims 3 to 10, wherein the gap is provided on either side from the center in the width direction of the pipe body. Heat exchange tube. A concave groove that is recessed toward the first flat wall by deforming the second flat wall is formed in the widthwise intermediate portion of the outer surface of the second flat wall of the tube body, and the inner fin is a bottom wall portion of the concave groove. The first flat wall, the second flat wall, and the connecting wall are brazed to the bottom wall portion and the first flat wall of the groove and sandwiched by the first flat wall and the first flat wall. The heat exchange pipe with an inner fin according to any one of claims 1 to 12, wherein a fluid circulation part including the protruding wall is divided into a plurality of parts. A pair of header tanks arranged at a distance from each other, and a plurality of heat exchange pipes arranged between both header tanks and having both end portions respectively connected to both header tanks, The heat exchanger which consists of a heat exchange pipe | tube with an inner fin in any one of Claims 1-13. Each header tank is arranged side by side in the ventilation direction, and has a header portion connected to each other. A heat exchange pipe is arranged between the header portions of both header tanks and communicates with the header portion. The heat exchanger according to claim 14, wherein A pair of header tanks arranged at a distance from each other, and a plurality of heat exchange pipes arranged between both header tanks and having both ends connected to both header tanks, The heat exchange pipes are arranged side by side in the ventilation direction and have header parts connected to each other, and the heat exchange pipe is composed of the heat exchange pipe with inner fins according to claim 11. A fluid circulation part is provided, a notch is formed in a portion existing in a gap between both protruding walls at both longitudinal ends of the first flat wall of the pipe body, and two fluid circulation parts in the pipe body are provided. Both end portions in the length direction of the provided portion protrude from the portion existing in the gap between the protruding walls of the first flat wall, and both fluid circulation portions of the pipe body are respectively connected to both header tanks. The head Heat exchanger that is vented into the header portion together is disposed between the parts.

Images