WO2018139863A1

WO2018139863A1 - Heat exchanger of refrigerator

Info

Publication number: WO2018139863A1
Application number: PCT/KR2018/001098
Authority: WO
Inventors: 박태균; 김주혁; 이응열; 최지원
Original assignee: 엘지전자 주식회사
Priority date: 2017-01-25
Filing date: 2018-01-25
Publication date: 2018-08-02
Also published as: KR20180087775A; CN110494709A; EP3575723A1; US20210131749A1; EP3575723A4

Abstract

A heat exchanger of a refrigerator according to the present invention is a micro-channel type heat exchanger of a refrigerator comprising: a first heat exchanging unit including a plurality of flat tubes for exchanging heat between a refrigerant and air and connected to an inlet pipe through which the refrigerant flows; a second heat exchanging unit including a plurality of flat tubes for exchanging heat between the refrigerant and air, disposed on the outside of the first heat exchanging unit and connected to a discharge tube through which the refrigerant is discharged; and a connection pipe for connecting the first heat exchanging unit and the second heat exchanging unit and supplying the refrigerant discharged from the first heat exchanging unit to the second heat exchanging unit, wherein the first heat exchanging unit is arranged to exchange heat with air that has been heat-exchanged with the second heat exchanging unit, and the sum of the cross sectional areas of the flat tubes of the first heat exchanging unit is larger than the sum of the cross sectional areas of the flat tubes of the second heat exchanging unit.

Description

Heat exchanger of refrigerator

The present invention relates to a heat exchanger of a refrigerator.

In general, the heat exchanger may be used as a condenser or evaporator in a refrigeration cycle device consisting of a compressor, a condenser, an expansion device, and an evaporator.

In addition, the heat exchanger is installed in a vehicle, a refrigerator, etc. to exchange the refrigerant with air.

The heat exchanger may be classified into a fin tube type heat exchanger and a micro channel heat exchanger according to the structure.

Finned tube heat exchangers are made of copper, and micro-channel heat exchangers are made of aluminum.

The micro channel type heat exchanger has a good efficiency compared to the fin tube type heat exchanger because a fine flow path is formed therein.

Since a small microchannel type heat exchanger used in a conventional refrigerator or the like is manufactured in a one turn method, only a simple refrigerant path can be designed, and there is a problem in that heat exchange efficiency is lowered. In addition, the small microchannel type heat exchanger used in a refrigerator or the like has the same number of refrigerant tubes at the inlet and the outlet, so that the temperature difference between the refrigerant and the air is large in the portion where the high temperature refrigerant flows in, so that the heat exchange amount is large but the heat exchange efficiency is high. Is low and the temperature difference between the refrigerant and the air is small in the outflow portion of the low-temperature refrigerant is small heat exchange amount, but the heat exchange efficiency is high, there is a disadvantage that the overall heat exchange efficiency is lowered.

In addition, the conventional heat exchanger has the same cross-sectional area of the refrigerant tube in the inflow portion and the outflow portion, the change in the specific volume of the refrigerant, there is a problem that the heat exchange amount is lowered.

An object of the present invention is to provide a heat exchanger of a refrigerator in which a coolant flows smoothly even when used as a condenser.

Another object of the present invention is to provide a heat exchanger of a refrigerator having a plurality of heat and excellent heat exchange efficiency.

Still another object of the present invention is to provide a heat exchanger of a refrigerator which minimizes a pressure difference between refrigerants in a plurality of rows.

The objects of the present invention are not limited to the above-mentioned objects, and other objects that are not mentioned will be clearly understood by those skilled in the art from the following description.

The heat exchanger of the refrigerator according to the present invention heats the second heat exchanger to the outside air before the first heat exchanger, and increases the sum of the cross-sectional areas of the flat tubes of the first heat exchanger and the cross-sectional area of the flat tubes of the second heat exchanger. It is done.

When the intermediate heat exchanger is disposed between the first heat exchanger and the second heat exchanger, the sum of the cross sectional areas of the flat tubes of the intermediate heat exchanger is less than or equal to the sum of the cross sectional areas of the flat tubes of the first heat exchanger.

In addition, the heat exchanger of the refrigerator according to the present invention is the inner diameter of the flat tube of the first heat exchanger, the inner diameter of the second flat tube is the same, the number of the flat tube of the first heat exchanger is a large number of the flat tube of the second heat exchanger. It is characterized by.

The heat exchanger of the refrigerator of the present invention has one or more of the following effects.

First, the second heat exchanger is heat-exchanged with the outside air before the first heat exchanger, and the optimum heat exchange amount considering the specific volume by increasing the sum of the cross-sectional areas of the flat tubes of the first heat exchanger and the cross-sectional area of the flat tubes of the second heat exchanger. There is an advantage to realize the heat exchange efficiency.

Second, by arranging the heat exchange surface of the first heat exchanger in multiple rows, it is possible to maximize space utilization.

Third, even when a plurality of micro channel type heat exchangers are stacked, a small refrigerant pressure difference is formed between the first heat exchange part and the second heat exchange part, so that the refrigerant flows smoothly.

Fourth, in an environment where a large heat exchange amount is required, the intermediate heat exchange part can be used, and even when the intermediate heat exchange part is used, the heat exchange efficiency and the heat exchange amount can be improved.

1 is a block diagram showing a refrigeration cycle apparatus according to a first embodiment of the present invention.

FIG. 2 is a perspective view illustrating the inside of the outdoor unit illustrated in FIG. 1.

3 is a perspective view of the outdoor heat exchanger shown in FIG. 2.

4 is an exploded perspective view of the outdoor heat exchanger illustrated in FIG. 2.

5 is a cross-sectional view of the first heat exchanger illustrated in FIG. 4.

6 is a cross-sectional view of the second heat exchanger illustrated in FIG. 4.

FIG. 7 is a graph showing the amount of heat exchange according to the area ratio of the flat tubes of the first heat exchange part and the second heat exchange part.

8 is a plan view of an outdoor heat exchanger according to a second embodiment of the present invention.

9 is a plan view of an outdoor heat exchanger according to a third embodiment of the present invention.

10 is a plan view of an outdoor heat exchanger according to a fourth embodiment of the present invention.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms, and only the embodiments make the disclosure of the present invention complete, and the general knowledge in the art to which the present invention belongs. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

The spatially relative terms " below ", " beneath ", " lower ", " above ", " upper " It may be used to easily describe the correlation of components with other components. Spatially relative terms are to be understood as including terms in different directions of the component in use or operation in addition to the directions shown in the figures. For example, when flipping a component shown in the drawing, a component described as "below" or "beneath" of another component may be placed "above" the other component. Can be. Thus, the exemplary term "below" can encompass both an orientation of above and below. The components can be oriented in other directions as well, so that spatially relative terms can be interpreted according to the orientation.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, “comprises” and / or “comprising” refers to a component, step, and / or operation that excludes the presence or addition of one or more other components, steps, and / or operations. I never do that.

Unless otherwise defined, all terms (including technical and scientific terms) used in the present specification may be used in a sense that can be commonly understood by those skilled in the art. In addition, the terms defined in the commonly used dictionaries are not ideally or excessively interpreted unless they are specifically defined clearly.

In the drawings, the thickness or size of each component is exaggerated, omitted, or schematically illustrated for convenience and clarity of description. In addition, the size and area of each component does not necessarily reflect the actual size or area.

In addition, the angle and direction mentioned in the process of demonstrating the structure of an Example are based on what was described in drawing. In the description of the structure constituting an embodiment in the specification, if the reference point and the positional relationship with respect to the angle is not clearly mentioned, reference is made to related drawings.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing a refrigeration cycle apparatus according to a first embodiment of the present invention, Figure 2 is a perspective view showing the inside of the outdoor unit shown in FIG.

1 and 2, the refrigeration cycle apparatus according to the present embodiment includes a compressor 10 for compressing a refrigerant, an outdoor heat exchanger 20 in which the refrigerant is heat-exchanged with outdoor air, and an expansion mechanism for expanding the refrigerant ( 12) and an indoor heat exchanger (13) in which the refrigerant exchanges heat with the indoor air.

The refrigerant compressed by the compressor 10 may pass through the outdoor heat exchanger 20 to be condensed by heat exchange with outdoor air.

The outdoor heat exchanger 20 may be used as a condenser.

The refrigerant condensed in the outdoor heat exchanger 20 may flow to the expansion mechanism 12 and expand. The refrigerant expanded by the expansion mechanism 12 may be exchanged with the indoor air and evaporated while passing through the indoor heat exchanger 13.

The indoor heat exchanger 12 may be used as an evaporator to evaporate the refrigerant.

The refrigerant evaporated in the indoor heat exchanger 12 may be recovered by the compressor 10.

The refrigerant is operated in a cooling cycle while circulating the compressor 10, the outdoor heat exchanger 20, the expansion mechanism 12, and the indoor heat exchanger 13.

The compressor 10 may be connected to a suction channel of the compressor 10 for guiding the refrigerant passing through the indoor heat exchanger 13 to the compressor 10. The accumulator 14 in which the liquid refrigerant accumulates may be installed in the suction passage of the compressor 10.

The indoor heat exchanger 13 may have a refrigerant passage through which the refrigerant passes.

The refrigeration cycle apparatus may be a separate air conditioner in which the indoor unit I and the outdoor unit O are separated, and in this case, the compressor 10 and the outdoor heat exchanger 20 may be installed inside the outdoor unit I. In addition, the refrigeration cycle apparatus may be a refrigerator, the indoor heat exchanger (13) is arranged to heat exchange with the air in the food storage, the outdoor heat exchanger (20) machine 20 may heat exchange with the air outside the food storage. In the case of the refrigerator, the indoor unit I and the outdoor unit O may be arranged together in the main body.

The expansion mechanism 12 may be installed in either the indoor unit I or the outdoor unit O.

The indoor heat exchanger 13 may be installed inside the indoor unit (I).

The outdoor unit O may be provided with an outdoor fan 15 for blowing outdoor air to the outdoor heat exchanger 20.

The indoor unit I may be provided with an indoor fan 16 for blowing indoor air to the indoor heat exchanger 13.

3 is a perspective view of the outdoor heat exchanger 20 shown in FIG. 2, FIG. 4 is an exploded perspective view of the outdoor heat exchanger 20 shown in FIG. 2, and FIG. 5 is a first heat exchanger 100 shown in FIG. 4. 6 is a cross-sectional view of the second heat exchanger 200 shown in FIG. 4.

The outdoor heat exchanger 20 is a micro channel type heat exchanger. The outdoor heat exchanger 20 is made of aluminum.

The outdoor heat exchanger 20 includes a first heat exchanger 100 and a second heat exchanger 200. Unlike the present embodiment, the outdoor heat exchanger 20 may have two or more heat exchangers stacked.

The outdoor heat exchanger 20 is connected to the first heat exchanger 100, the second heat exchanger 200 stacked with the first heat exchanger 100, and the first heat exchanger 100 to supply refrigerant. The tube 22 and the discharge tube 24 connected to the second heat exchange part 200 to discharge the refrigerant, the first heat exchange part 100 and the second heat exchange part 200 are connected, and the refrigerant is connected to the first refrigerant. It includes a connecting pipe 25 for flowing from the heat exchange unit 100 to the second heat exchange unit 200.

The first heat exchange part 100 is disposed to exchange heat with air heat exchanged with the second heat exchange part 200. Specifically, the first heat exchanger 100 and the second heat exchanger 200 are disposed on a path through which the external air flows, and the external air is primarily heat exchanged with the second heat exchanger 200, and the secondary air is secondary. Thus, heat exchange with the first heat exchanger 100. More specifically, the outdoor unit includes an air inlet part H1 through which external air is introduced, and an air outlet part H2 through which the inlet air exchanges heat with the heat exchange parts and flows out, and the second heat exchange part 200 includes a first heat exchanger. It is disposed adjacent to the air inlet portion H1 relative to the portion 100.

Therefore, the first heat exchange part 100 through which the high temperature refrigerant flows is disposed in a region having a high outside temperature, and the second heat exchange part 200 through which the low temperature refrigerant flows is disposed in a region where the temperature of the outside air is low, The heat exchange efficiency of the outdoor heat exchanger 20 is improved.

The first heat exchange part 100 and the second heat exchange part 200 may be arranged to define a heat exchange surface P intersecting with the flow direction of air. The first heat exchanger 100 and the second heat exchanger 200 cross the air flow direction, and form a heat exchange surface through which the air can pass through the heat exchanger. The first heat exchange part 100 and the second heat exchange part 200 may be stacked along the flow direction of air.

The first heat exchange part 100 and the second heat exchange part 200 are manufactured by stacking a plurality of flat tubes 50. The first heat exchange part 100 and the second heat exchange part 200 arrange the flat tube 50 horizontally to allow the refrigerant to move horizontally.

Specifically, the flat tubes 50 of the first heat exchange part 100 and the second heat exchange part 200 are horizontally disposed horizontally when the air flow direction is in the front-rear direction, and the plurality of flat tubes ( 50 may be stacked in a vertical direction. Heat is exchanged with the refrigerant in the flat tube 50 while air passes through the space between the plurality of flat tubes 50 stacked in the vertical direction (longitudinal direction). The plurality of flat tubes 50 stacked vertically define a heat exchange surface P1 together with fins 60 to be described later.

The first heat exchange part 100 may include a flat tube 50, a left header, a right header, and a fin 60. In detail, the first heat exchange part 100 includes a plurality of first flat tubes 51 having a plurality of flow paths formed therein, and a first fin 61 connecting the first flat tubes 51 to conduct heat. The first left header 71 is coupled to one side of the plurality of first flat tubes 51 and communicates with one side of the plurality of first flat tubes 51, and the refrigerant flows, and the other side of the plurality of first flat tubes 51. It is coupled to, and the first right header 81 in communication with the other side of the plurality of first flat tube 51 flows the refrigerant.

The first flat tube 51 is disposed to extend in the transverse direction. Inside the first flat tube 51, a flow path through which a refrigerant flows is formed.

The first flat tube 51 is disposed horizontally, and a plurality of first flat tubes 51 are stacked in the vertical direction. A plurality of flow paths may be formed in the first flat tube 51.

The left side of the first flat tube 51 communicates with the first left header 71, and the right side communicates with the first right header 81.

The first fin 61 is formed by bending in the vertical direction, and connects two first flat tubes 51 stacked in the vertical direction to conduct heat.

The first right header 81 is in communication with the other side of the plurality of first flat tubes 51. The first right header 81 extends in the vertical direction and is connected to the inflow pipe 22. The inside of the first right header 81 is formed as one space, and distributes and supplies the refrigerant introduced through the inflow pipe 22 to the plurality of first flat tubes 51.

One inlet pipe 22 may be connected to the first right header 81, and a plurality of inlet pipes 22 may be connected to the first right header 81. In the first embodiment, the inlet pipe 22 may include a first inlet pipe 22a and a second inlet pipe 22b disposed below the first inlet pipe 22.

The first left header 71 communicates with one side of the plurality of first flat tubes 51. The first left header 71 extends long in the vertical direction and is connected to the connecting pipe 25. The inside of the first left header 71 is formed as one space, and guides the refrigerant discharged to the other side of the plurality of first flat tubes 51 to the connection pipe 25.

One connector 25 may be connected to the first left header 71, and a plurality of connectors 25 may be connected. In the first embodiment, one connecting pipe 25 is connected to the center of the first left header 71. One side of the connection pipe 25 is connected to the first left header 71 of the first heat exchange part 100, and the other side is connected to the second left header 70 of the second heat exchange part 200.

The refrigerant introduced through the inlet pipe 22 is supplied to each of the first flat tubes 51 through the first right header 81, and the refrigerant passing through the first flat tube 51 exchanges heat with air. It is supplied to the connecting pipe 25 through the first left header 71. The inlet pipe 22 is connected to the compressor 10 to supply the high temperature and high pressure refrigerant to the first heat exchange unit 100.

The second heat exchange part 200, like the first heat exchange part 100, may include a plurality of flat tubes 50, fins 60, a left header, and a right header.

In detail, the second heat exchange part 200 includes a plurality of second flat tubes 52, a second fin 62, a second left header 70, and a second right header 80.

The second heat exchange part 200 includes a plurality of second flat tubes 52 having a plurality of flow paths formed therein, a second fin 62 connecting the second flat tubes 52 to conduct heat, and a plurality of It is coupled to one side of the second flat tube 52, the second left header 70 and the plurality of second flat tube 52 and the other side of the second flat tube 52 is in communication with one side of the plurality of second flat tube 52, , A second right header 80 in communication with the other sides of the plurality of second flat tubes 52, through which the refrigerant flows.

The second flat tube 52 is disposed to extend in the transverse direction. A flow path through which the refrigerant flows is formed in the second flat tube 52.

The second flat tube 52 is disposed horizontally, and a plurality of second flat tubes 52 are stacked in the vertical direction. A plurality of flow paths may be formed in the second flat tube 52.

The left side of the second flat tube 52 communicates with the second left header 70, and the right side communicates with the second right header 80.

The second fin 62 is formed by bending in the vertical direction and connecting two second flat tubes 52 stacked in the vertical direction to conduct heat.

The second right header 80 communicates with the other side of the plurality of second flat tubes 52. The second right header 80 extends long in the vertical direction and is connected to the outlet pipe 24. The inside of the second right header 80 is formed as one space, and supplies the refrigerant discharged from the plurality of second flat tubes 52 to the outlet pipe 24.

One outlet pipe 24 may be connected to the second right header 80, and a plurality of outlet pipes 24 may be connected to the second right header 80.

The second left header 70 communicates with one side of the plurality of second flat tubes 52. The second left header 70 extends long in the vertical direction and is connected to the connecting pipe 25. The inside of the second left header 70 is formed as one space, and supplies the refrigerant supplied through the connection pipe 25 to the plurality of second flat tubes 52.

One connector 25 may be connected to the second left header 70, and a plurality of connectors 25 may be connected. In the first embodiment, one connecting pipe 25 is connected to the center of the second left header 70. Since the connecting pipe 25 connects the first left header 71 and the second left header 70, the connecting pipe 25 has a length and a manufacturing cost is reduced.

The refrigerant heat-exchanged in the first heat exchange part 100 has a large specific volume because it is a gaseous state of high temperature and high pressure discharged from the compressor 10. Refrigerant heat exchanged in the second heat exchanger 200 is a heat exchange is completed in the first heat exchanger 100, a gas or a mixed state of the gas and liquid having a temperature relatively lower than the refrigerant of the first heat exchanger 100 Have. Therefore, the specific volume of the refrigerant heat exchanged in the second heat exchange part has a specific volume smaller than that of the refrigerant heat exchanged in the first heat exchange part 100.

At this time, if the heat exchange area of the first heat exchange part 100 and the heat exchange area of the second heat exchange part 200 are the same, the first heat exchange part 100 may be due to the large specific volume of the refrigerant in the first heat exchange part 100. ), The amount of heat exchange and efficiency is greatly reduced.

Therefore, in the embodiment, the sum of the cross-sectional areas of the flat tubes 50 of the first heat exchange part 100 is greater than the sum of the cross-sectional areas of the flat tubes 50 of the second heat exchange part 200, and thus, the first heat exchange part ( 100, it is possible to improve the heat exchange amount.

For example, the ratio of the sum of the cross sectional areas of the flat tubes 50 of the first heat exchange part 100 and the cross sectional areas of the flat tubes 50 of the second heat exchange part 200 is 7 to 9: 1 to 2. Can be. The ratio of the sum of the cross-sectional areas of the flat tubes 50 of the first heat exchange part 100 and the cross-sectional area of the flat tubes 50 of the second heat exchange part 200 is preferably 8: 2. At this time, it is preferable to minimize the heat exchange between the first heat exchange part 100 and the second heat exchange part 200. Specifically, the heat exchange surfaces of the first heat exchange unit 100 and the heat exchange surfaces P1 and P2 of the second heat exchange unit 200 are spaced apart from each other.

Specifically, the cross-sectional area of the flat tubes 50 of the first heat exchanger 100 and the cross-sectional area of the flat tubes 50 of the second heat exchanger 200 can be adjusted by varying the inner diameter of the flat tube 50, but In consideration of cost and convenience of manufacture, it is desirable to adjust the number of flat tubes 50 having the same inner diameter.

The inner diameter of the flat tube 50 of the first heat exchange part 100 and the inner diameter of the second flat tube 52 are the same, and the number of the flat tubes 50 of the first heat exchange part 100 is the second heat exchange part. It may be larger than the number of flat tubes 50 of the (200). The inner diameter of the flat tube 50 of the first heat exchange part 100 and the inner diameter of the second flat tube 52 are the same, and the number of the flat tubes 50 of the first heat exchange part 100 and the second heat exchange part The ratio of the number of the flat tubes 50 of the 200 may be 7 to 9: 1 to 2. The inner diameter of the flat tube 50 of the first heat exchange part 100 and the inner diameter of the second flat tube 52 are the same, and the number of the flat tubes 50 of the first heat exchange part 100 and the second heat exchange part It is preferable that the ratio of the number of the flat tubes 50 of 200 is 8: 2.

When the number of the flat tubes 50 of the first heat exchange part 100 is greater than the number of the flat tubes 50 of the second heat exchange part 200, the first flat tube of the first heat exchange part 100 ( The pitch between the 51 and the pitch between the second flat tube 52 of the second heat exchange part 200 is preferably the same. Of course, the pitch between the first flat tubes 51 of the first heat exchange part 100 may be smaller than the pitch between the second flat tubes 52 of the second heat exchange.

For more efficient heat exchange and air flow, the first flat tubes 51 of the first heat exchange part 100 and the second flat tube 52 of the second heat exchange are viewed in the air flow direction (front and rear direction). ) May be arranged not to overlap each other. The air passing between the first flat tubes 51 of the first heat exchange part 100 flows into the space between the second flat tubes 52 of the second heat exchange, changes its direction, and increases the time for which the air stays. do.

FIG. 7 is a graph showing the heat exchange amount according to the area ratio of the flat tube 50 of the first heat exchange part 100 and the second heat exchange part 200.

Referring to FIG. 7, the inner diameter of the flat tube 50 of the first heat exchange part 100 and the inner diameter of the second flat tube 52 are the same, and the inner diameter of the flat tube 50 of the first heat exchange part 100 is the same. When the ratio of the number and the number of the flat tubes 50 of the second heat exchange part 200 is 8: 2, it can be seen that it has the maximum heat exchange amount.

8 is a plan view of an outdoor heat exchanger 20 according to a second embodiment of the present invention.

Compared to the first embodiment, the second embodiment has a difference in the number of heat exchange surfaces of the first heat exchange part 100 or the second heat exchange part 200.

Referring to FIG. 8, the flat tubes 50 of the first heat exchange part 100 or the second heat exchange part 200 are divided into a plurality of flat tube 50 groups, and the plurality of flat tube 50 groups are air. A plurality of columns may be formed along the flow direction of the.

Since the refrigerant in the first heat exchange part 100 has a larger specific volume than the refrigerant in the second heat exchange part 200, the flat tubes 50 of the first heat exchange part 100 are flat tubes of the second heat exchange part 200. Should have a number greater than (50). At this time, when the first heat exchanger 100 and the second heat exchanger 200 are arranged in one row, a problem arises in that the size of the first heat exchanger 100 becomes excessively large.

Therefore, in the second embodiment, the heat exchange surface of the first heat exchange part 100 is arranged in multiple rows. In detail, the first heat exchange part 100 defines a heat exchange surface P1 by forming a group by arranging a plurality of first flat tubes 51 having a predetermined pitch up and down. The plurality of flat tube groups 50 may form a plurality of rows along the air flow (front and rear) direction. That is, the heat exchange surfaces P1a, P1b, and P1c are spaced apart along the front and rear directions to form a plurality of rows.

At this time, the left header or the right header may be arranged in plurality in correspondence with each heat exchange surface. Specifically, the first right header 81 may be disposed on each of the heat exchange surfaces of the first heat exchange part 100. Three first right headers 81 are disposed on one side of three heat exchange surfaces of the first heat exchange unit 100. An inlet pipe 22 is connected to each first right header 81. The first left header 71 may be disposed on each of the heat exchange surfaces of the first heat exchange part 100. Three first left headers 71 are disposed on the other side of the three thermal bridge screens of the first heat exchanger 100. A connecting pipe 25 is connected to each first left header 71.

Therefore, the heat exchange area of the first heat exchange part 100 may be improved, and the first heat exchange part 100 may be arranged in multiple rows in a limited space, thereby maximizing space utilization.

9 is a plan view of an outdoor heat exchanger 20 according to a third embodiment of the present invention.

Compared to the second embodiment, the third embodiment has a difference in the structure of the left header or the right header.

Referring to FIG. 9, the left header or the right header of the third embodiment may be in communication with a plurality of flat tubes 50 disposed on each heat exchange surface. Specifically, the first left header 71 of the first heat exchange part 100 communicates with the plurality of heat exchange surfaces. One first left header 71 and a plurality of heat exchange surfaces communicate with each other. The first right header 81 of the first heat exchange part 100 communicates with the plurality of heat exchange surfaces. One first right header 81 and a plurality of heat exchange surfaces communicate with each other.

Therefore, since the left header or the right header can be shared, the manufacturing cost can be reduced.

10 is a plan view of an outdoor heat exchanger 20 according to a fourth embodiment of the present invention.

Compared to the third embodiment, the fourth embodiment further includes an intermediate heat exchanger 300.

Referring to FIG. 10, the intermediate heat exchange part 300 includes a plurality of flat tubes 50 for exchanging refrigerant and air, and heat exchanges the refrigerant discharged from the first heat exchange part 100 to the second heat exchange part 200. Supplies).

The intermediate heat exchange part 300 is arranged to heat the refrigerant passing through the first heat exchange part 100 and to supply the second heat exchange part 200.

The intermediate heat exchanger 300 may include a flat tube 50, a third left header 73, a third right header 83, and a fin 60, similarly to the first heat exchanger 100.

Specifically, the third left header 73 is connected to the left side of the flat tube 50 of the intermediate heat exchanger 300, and the third right header 83 is connected to the right side thereof. The flat tube 50 of the intermediate heat exchange part 300 defines a heat exchange surface P3.

The third left header 73 is connected via the first left header 71 and the first connector 25a, and the third right header 83 is the second right header 80 and the second connector 25b. Is connected via).

The specific volume of the refrigerant in the intermediate heat exchange part 300 is smaller than the specific volume of the refrigerant in the first heat exchange part 100 and larger than the specific volume of the refrigerant in the second heat exchange part 200.

The sum of the cross-sectional areas of the flat tubes 50 of the intermediate heat exchange part 300 is less than or equal to the sum of the cross-sectional areas of the flat tubes 50 of the first heat exchange part 100, and the flat tubes of the second heat exchange part 200. 50) can be larger than the sum of the cross-sectional areas.

The sum of the cross-sectional areas of the flat tubes 50 of the first heat exchange part 100 and the sum of the cross-sectional areas of the flat tubes 50 of the intermediate heat exchange part 300, and the flat tubes 50 of the second heat exchange part 200. The ratio of the sum of the cross-sectional areas may be composed of 7-9: 7-9: 1-2.

Specifically, as described above, for convenience of manufacture, the inner diameter of the flat tube 50 of the first heat exchange part 100, the inner diameter of the second flat tube 52 and the flat tube of the intermediate heat exchange part 300 ( The inner diameter of the 50 is the same, the number of the flat tube 50 of the intermediate heat exchange unit 300 is less than or equal to the number of the flat tube 50 of the first heat exchange unit 100, the second heat exchange unit 200 ) May be greater than the number of flat tubes 50.

Therefore, in an environment where a large heat exchange amount is required, the intermediate heat exchange part 300 can be used, and even when the intermediate heat exchange part 300 is used, the heat exchange efficiency and the heat exchange amount can be improved.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above embodiments but may be manufactured in various forms, and having ordinary skill in the art to which the present invention pertains. It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

Claims

In the heat exchanger of the refrigerator composed of a micro-channel type,

A first heat exchanger including a plurality of flat tubes configured to exchange heat between the refrigerant and the air, and connected with an inlet pipe through which the refrigerant flows;

A second heat exchange part including a plurality of flat tubes for exchanging a refrigerant and air, the second heat exchange part being disposed outside the first heat exchange part and connected to a discharge tube through which the refrigerant is discharged;

And a connecting pipe connecting the first heat exchanger and the second heat exchanger and supplying the refrigerant discharged from the first heat exchanger to the second heat exchanger.

The first heat exchanger is arranged to exchange heat with air heat exchanged with the second heat exchanger,

The ratio of the sum of the cross-sectional areas of the flat tubes of the first heat exchange unit and the cross-sectional area of the flat tubes of the second heat exchange unit is 7 to 9: 1 to 2 heat exchanger of the refrigerator.
The method according to claim 1,

An air inlet unit through which external air is introduced; And

Further, the air flowing in and the heat exchange with the heat exchange portion further comprises an air outlet portion,

And the second heat exchange part is disposed adjacent to the air inlet part relative to the first heat exchange part.
The method according to claim 1,

The flat tubes of the first heat exchanger are divided into a plurality of flat tube groups, and the plurality of flat tube groups form a plurality of rows along a flow direction of air.
The method according to claim 1,

The first heat exchanger or the second heat exchanger,

A plurality of said flat tubes extending laterally and spaced apart in the longitudinal direction;

A pin connecting the flat tube to conduct heat;

A left header coupled to one side of the plurality of flat tubes and in communication with one side of the plurality of flat tubes;

And a right header coupled to the other side of the plurality of flat tubes and communicating with the other side of the plurality of flat tubes so that the refrigerant flows.
The method according to claim 4,

In the first heat exchanger,

A plurality of fins connecting the plurality of flat tubes and the plurality of flat tubes defines a heat exchange surface that intersects the flow direction of air,

The heat exchange surface is a heat exchanger of the refrigerator which is arranged a plurality of spaced apart.
The method according to claim 5,

The left header or the right header is a plurality of heat exchangers of the refrigerator disposed to correspond to each of the heat exchange surface.
The method according to claim 5,

And the left header or the right header communicates with a plurality of flat tubes disposed on the respective heat exchange surfaces.
The method according to claim 4,

The connecting pipe is a heat exchanger of the refrigerator connecting the left header of the first heat exchange part and the right header of the second heat exchange part.
The method according to claim 1,

It further comprises a plurality of flat tubes for heat exchange between the refrigerant and air, and further comprises an intermediate heat exchanger for heat-exchanging the refrigerant discharged from the first heat exchanger to supply to the second heat exchanger,

The sum of the cross sectional areas of the flat tubes of the intermediate heat exchange part is less than or equal to the sum of the cross sectional areas of the flat tubes of the first heat exchange part, and the sum of the cross sectional areas of the flat tubes of the second heat exchange part.
In the heat exchanger of the refrigerator composed of a micro-channel type,

A first heat exchanger including a plurality of flat tubes configured to exchange heat between the refrigerant and the air, and connected with an inlet pipe through which the refrigerant flows;

A second heat exchange part including a plurality of flat tubes for exchanging a refrigerant and air, the second heat exchange part being disposed outside the first heat exchange part and connected to a discharge tube through which the refrigerant is discharged;

And a connecting pipe connecting the first heat exchanger and the second heat exchanger and supplying the refrigerant discharged from the first heat exchanger to the second heat exchanger.

The first heat exchanger is arranged to exchange heat with air heat exchanged with the second heat exchanger,

The inner diameter of the flat tube of the first heat exchange part and the inner diameter of the second flat tube are the same,

The ratio of the number of the flat tubes of the first heat exchange unit and the number of the flat tubes of the second heat exchange unit is 7 ~ 9: 1 ~ 2 heat exchanger of the refrigerator.
The method according to claim 10,

A plurality of flat tubes for heat exchange between the refrigerant and air, further comprising an intermediate heat exchanger for heat-exchanging the refrigerant discharged from the first heat exchanger and supplying to the second heat exchanger,

The number of flat tubes of the intermediate heat exchanger is less than or equal to the number of flat tubes of the first heat exchanger, and is greater than the number of flat tubes of the second heat exchanger.
In the heat exchanger of the refrigerator composed of a micro-channel type,

A first heat exchanger including a plurality of flat tubes configured to exchange heat between the refrigerant and the air, and connected with an inlet pipe through which the refrigerant flows;

A second heat exchange part including a plurality of flat tubes for exchanging a refrigerant and air, the second heat exchange part being disposed outside the first heat exchange part and connected to a discharge tube through which the refrigerant is discharged;

And a connecting pipe connecting the first heat exchanger and the second heat exchanger and supplying the refrigerant discharged from the first heat exchanger to the second heat exchanger.

The first heat exchanger is arranged to exchange heat with air heat exchanged with the second heat exchanger,

The sum of the cross sectional areas of the flat tubes of the first heat exchange unit is greater than the sum of the cross sectional areas of the flat tubes of the second heat exchange unit.
The method according to claim 12,

It further comprises a plurality of flat tubes for heat exchange between the refrigerant and air, and further comprises an intermediate heat exchanger for heat-exchanging the refrigerant discharged from the first heat exchanger to supply to the second heat exchanger,

The sum of the cross sectional areas of the flat tubes of the intermediate heat exchange part is less than or equal to the sum of the cross sectional areas of the flat tubes of the first heat exchange part, and the sum of the cross sectional areas of the flat tubes of the second heat exchange part.
In the heat exchanger of the refrigerator composed of a micro-channel type,

A first heat exchanger including a plurality of flat tubes configured to exchange heat between the refrigerant and the air, and connected with an inlet pipe through which the refrigerant flows;

A second heat exchange part including a plurality of flat tubes for exchanging a refrigerant and air, the second heat exchange part being disposed outside the first heat exchange part and connected to a discharge tube through which the refrigerant is discharged;

And a connecting pipe connecting the first heat exchanger and the second heat exchanger and supplying the refrigerant discharged from the first heat exchanger to the second heat exchanger.

The first heat exchanger is arranged to exchange heat with air heat exchanged with the second heat exchanger,

The inner diameter of the flat tube of the first heat exchange part and the inner diameter of the second flat tube are the same,

The number of flat tubes of the first heat exchanger is larger than the flat tubes of the second heat exchanger.
The method according to claim 12,

It further comprises a plurality of flat tubes for heat exchange between the refrigerant and air, and further comprises an intermediate heat exchanger for heat-exchanging the refrigerant discharged from the first heat exchanger to supply to the second heat exchanger,

The inner diameter of the flat tube of the third heat exchange part and the inner diameter of the first flat tube are the same,

The number of flat tubes of the third heat exchange unit is less than or equal to the number of flat tubes of the first heat exchange unit, the heat exchanger of the refrigerator larger than the number of flat tubes of the second heat exchange unit.