CN217029322U

CN217029322U - Multi-stage middle-open pump bearing cooling structure

Info

Publication number: CN217029322U
Application number: CN202220218820.8U
Authority: CN
Inventors: 蒋敦军; 戴鑫宇; 蒋伟民; 向庆; 李明
Original assignee: Hunan Credo Pump Co ltd
Current assignee: Hunan Credo Pump Co ltd
Priority date: 2022-01-26
Filing date: 2022-01-26
Publication date: 2022-07-22
Anticipated expiration: 2032-01-26

Abstract

The utility model discloses a multi-stage axially split pump bearing cooling structure which comprises a pump shell body and a pump shaft, wherein the pump shell body is formed by assembling an upper shell and a lower shell, two ends of the lower shell are respectively provided with a first bearing part and a second bearing part, the first bearing part comprises a first bearing body and a first bearing part, and the second bearing part comprises a second bearing body and a second bearing part. According to the utility model, the first bearing body is provided with the first inlet hole and the first outlet hole, the second bearing body is provided with the second inlet hole and the second outlet hole in a matching manner, one end of the first connecting pipe is connected with the balance pipe, the other end of the first connecting pipe is connected with the first inlet hole, and the second connecting pipe is connected with the first outlet hole and the second inlet hole, so that liquid enters the first cooling cavity through the balance pipe and the first connecting pipe to cool the first bearing part, and then enters the second cooling cavity through the second connecting pipe to cool the second bearing part, and the service life of the bearing part is effectively prolonged.

Description

Multi-stage middle-open pump bearing cooling structure

Technical Field

The utility model relates to the technical field of centrifugal pumps, in particular to a multi-stage split pump bearing cooling structure.

Background

The existing multistage split pump is provided with multistage impellers in the middle of a pump shaft, each impeller is provided with a guide vane for drainage, two ends of the pump shaft are supported by bearing parts and are arranged in the bearing parts, and shaft seal devices are symmetrically arranged at the extending parts of the pump shaft at the first section and the tail section of the pump; be provided with the bearing in the bearing portion, the both ends card of pump shaft is put in the bearing, and the pump shaft can drive the inner ring of bearing in the rotation and rotate in the lump, so, at the well turn-on pump operation in-process, the bearing can produce great heat, and the heat is delayed can't distribute out then can cause the bearing life-span to reduce, is unfavorable for the improvement of well turn-on pump quality.

Therefore, it is desirable to provide a multi-stage split pump bearing cooling structure to solve the above-mentioned problems.

SUMMERY OF THE UTILITY MODEL

Based on this, it is necessary to provide a multistage middle open pump bearing cooling structure to the not enough of prior art, effectively cools down the bearing at the pump shaft rotation in-process, improves the life of bearing.

In order to solve the technical problems, the technical scheme adopted by the utility model is as follows: a multi-stage pump-in bearing cooling structure comprises a pump shell body and a pump shaft, wherein the pump shell body is formed by assembling an upper shell and a lower shell, a pump cavity is formed by the upper shell and the lower shell in a surrounding mode, and the pump shaft is arranged in the pump cavity; the two ends of the lower shell are respectively provided with a first bearing part and a second bearing part, and the two ends of the pump shaft are respectively clamped in the first bearing part and the second bearing part; a first balance cavity and a second balance cavity are respectively arranged at two ends of the pump shell body on one side of the first bearing part and one side of the second bearing part, and a balance pipe is arranged between the first balance cavity and the second balance cavity;

the first bearing part comprises a first bearing body and a first bearing piece, a first annular spacer block is arranged on the inner side part of the first bearing body, the first annular spacer block divides the inner side of the first bearing body into a first accommodating cavity and a first cooling cavity, the first bearing piece is accommodated in the first accommodating cavity, one end of the pump shaft penetrates through the first bearing piece, a first inlet hole and a first outlet hole are formed in the first bearing body, the first inlet hole and the first outlet hole are communicated with the first cooling cavity, a first connecting pipe is connected to the balance pipe, and the first connecting pipe is communicated with the first inlet hole;

the second bearing part comprises a second bearing body and a second bearing piece, a second annular spacer block is arranged on the inner side part of the second bearing body, the second annular spacer block divides the inner side of the second bearing body into a second accommodating cavity and a second cooling cavity, the second bearing piece is accommodated in the second accommodating cavity, one end of the pump shaft penetrates through the second bearing piece, a second inlet hole and a second outlet hole are formed in the second bearing body, and the second inlet hole and the second outlet hole are communicated with the second cooling cavity; and a second connecting pipe is arranged between the first outlet hole and the second inlet hole, one end of the second connecting pipe is arranged on the first bearing body and is communicated with the first cooling cavity, and the other end of the second connecting pipe is arranged on the second bearing body and is communicated with the second cooling cavity.

In one embodiment, the second bearing body is provided with a third connecting pipe at the second outlet hole.

In one embodiment, a switch valve is arranged on the first connecting pipe.

In one embodiment, the first bearing body includes a first bearing seat and a first sealing plate, the first bearing seat is disposed in abutting connection with the first sealing plate, the second bearing body includes a second bearing seat and a second sealing plate, and the second bearing seat is disposed in abutting connection with the second sealing plate.

In one embodiment, the first bearing seat is provided with first butt blocks at intervals in a first cooling cavity, the first butt blocks are provided with first butt holes, the first sealing plate is provided with first fixing holes, and the first butt holes are matched with the first fixing holes; the first butt joint block is fixedly connected with the first sealing plate through a first bolt, and the first bolt penetrates through the first fixing hole and then is clamped in the first butt joint hole; the second bearing seat is provided with second butt joint blocks at intervals in a second cooling cavity, the second butt joint blocks are provided with second butt joint holes, the second sealing plate is provided with second fixing holes, and the second butt joint holes are matched with the second fixing holes; the second butt joint block is fixedly connected with the second sealing plate through a second bolt, and the second bolt penetrates through the second fixing hole and then is clamped in the second butt joint hole.

In one embodiment, a first fixing lug extends outwards from the peripheral side of the first bearing body, the first fixing lug is of a semicircular structure, and the first fixing lug is connected with the lower shell side through a first bolt piece; the second bearing body week side outwards extends has the fixed lug of second, the fixed lug of second is half ring-shaped structure, the fixed lug of second passes through second bolt spare and is connected with lower casing side.

In one embodiment, a first throttle plate and a first end cover are arranged at two ends of the lower shell on one side of the first bearing part, a second throttle plate and a second end cover are arranged at one side of the second bearing part, the first balance cavity is formed by the first throttle plate, the first end cover and the upper shell in a surrounding mode, and one end of the balance pipe is arranged on the upper shell and is communicated with the first balance cavity; the second balance cavity is formed by enclosing the second throttle plate, the second end cover and the upper shell, and the other end of the balance pipe is arranged on the upper shell and communicated with the second balance cavity; the pump shaft penetrates through the first throttle plate, the first end cover, the second throttle plate and the second end cover respectively, and gaps are formed between the pump shaft and the first throttle plate and between the pump shaft and the second throttle plate respectively.

In one embodiment, mechanical seal cavities are arranged at two ends of the pump shell body and on the inner sides of the first balance cavity and the second balance cavity, and a mechanical seal flushing pipe is connected between the two mechanical seal cavities.

In one embodiment, a support plate is arranged in the pump shell body, the support plate divides the pump cavity into a first cavity and a second cavity, the pump shaft is arranged through the support plate, the forward impeller is arranged in the first cavity, and the reverse impeller is arranged in the second cavity; an upper support plate is arranged in the upper shell, a lower support plate is arranged in the lower shell, the upper support plate and the lower support plate are arranged in a butt joint mode, and the upper support plate and the lower support plate form a support plate structure; the supporting plate is provided with a ring cylinder body, a supporting ring groove is formed in the ring cylinder body, and the pump shaft penetrates through the supporting ring groove.

In one embodiment, the pump further comprises a guide vane assembly, the guide vane assembly is fixedly arranged in a pump cavity, impellers are arranged on the pump shaft at intervals, the guide vane assembly is sleeved on the outer side part of the impeller, and the guide vane assembly is sleeved on the outer side part of the impeller; the upper shell is provided with a water outlet port and a water inlet port, and the water outlet port is communicated with the water inlet port through a conduction pipe; be in a plurality of in first cavity stator assembly will first cavity divide into first order water absorption chamber, a plurality of first transition runner and middle runner in proper order, be in a plurality of in the second cavity stator assembly will second cavity divide into secondary water absorption chamber, at least one second transition runner and water outlet flow way in proper order, water sucking mouth and delivery port have been seted up on the casing down, water sucking mouth and first order water absorption chamber intercommunication set up, delivery port and water outlet flow way intercommunication set up, water outlet port and middle runner intercommunication set up, water inlet port and secondary water absorption chamber intercommunication set up.

In summary, in the multi-stage pump-in bearing cooling structure of the present invention, the first bearing body is provided with the first inlet hole and the first outlet hole, the second bearing body is provided with the second inlet hole and the second outlet hole in a matching manner, one end of the first connecting pipe is connected to the balance pipe, the other end of the first connecting pipe is connected to the first inlet hole, and the second connecting pipe is connected to the first outlet hole and the second inlet hole, so that the liquid in the first balance cavity and/or the second balance cavity enters the first cooling cavity through the balance pipe and the first connecting pipe to perform the cooling treatment on the first bearing, and the liquid enters the second cooling cavity through the second connecting pipe from the first cooling cavity to perform the cooling treatment on the second bearing, thereby effectively prolonging the service life of the bearing.

Drawings

FIG. 1 is a schematic structural diagram of a multi-stage axially split pump bearing cooling structure according to the present invention;

FIG. 2 is a schematic structural view of a multi-stage axially split pump bearing cooling structure of the present invention after the upper housing is hidden;

FIG. 3 is a structural cross-sectional view of a multi-stage axially split pump bearing cooling structure according to the present invention;

FIG. 4 is a schematic view of the structure of the upper housing of the present invention;

FIG. 5 is a schematic view of the structure of the lower housing of the present invention;

FIG. 6 is a schematic view of the pump shaft and bearing assembly of the present invention;

FIG. 7 is an exploded view of the first bearing portion of the present invention;

fig. 8 is an exploded view of the second bearing portion of the present invention.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1 to 8, the multi-stage axially split pump bearing cooling structure of the present invention includes a pump casing body 100 and a pump shaft 200, wherein the pump casing body 100 is assembled by an upper casing 110 and a lower casing 120 which are horizontally split, a pump cavity 400 is formed by surrounding the upper casing 110 and the lower casing 120, and the pump shaft 200 is disposed in the pump cavity 400.

The multi-stage split pump bearing cooling structure further comprises a guide vane assembly 300, wherein the guide vane assembly 300 is fixedly arranged in the pump cavity 400, the impeller 210 is arranged on the pump shaft 200 at intervals, and the guide vane assembly 300 is sleeved at the outer side part of the impeller 210 and used for guiding liquid conveyed by the impeller 210 so as to facilitate the rotation of the impeller 210 to realize the acting effect on the liquid; a first bearing 500 and a second bearing 600 are respectively disposed at two ends of the lower housing 120, and two ends of the pump shaft 200 are respectively clamped in the first bearing 500 and the second bearing 600; the upper housing 110 is provided with a water outlet port 111 and a water inlet port 112, and the water outlet port 111 and the water inlet port 112 are communicated through a conduction pipe 113.

A first balance cavity 130 and a second balance cavity 140 are respectively arranged at two ends of the pump casing body 100 on one side of the first bearing part 500 and one side of the second bearing part 600, and a balance pipe 150 is arranged between the first balance cavity 130 and the second balance cavity 140 so as to reduce the pressure in the high-pressure end balance cavity; the pump casing body 100 is provided with a mechanical seal cavity 160 at both ends thereof inside the first balance cavity 130 and the second balance cavity 140, and a mechanical seal flushing pipe 170 is connected between the two mechanical seal cavities 160, so that the liquid flows to cool the mechanical seal components in the mechanical seal cavity 160.

Specifically, a first throttle plate 131 and a first end cap 132 are disposed at one side of the first bearing portion 500 at two ends of the lower housing 120, a second throttle plate 141 and a second end cap 142 are disposed at one side of the second bearing portion 600 of the lower housing 120, the first balance cavity 130 is enclosed by the first throttle plate 131, the first end cap 132 and the upper housing 110, one end of the balance pipe 150 is disposed on the upper housing 110 and is communicated with the first balance cavity 130; the second balance cavity 140 is defined by the second throttle plate 141, the second end cap 142 and the upper shell 110, and the other end of the balance pipe 150 is disposed on the upper shell 110 and is communicated with the second balance cavity 140; the pump shaft 200 is respectively disposed through the first throttle plate 131, the first end cap 132, the second throttle plate 141, and the second end cap 142, and there are small gaps between the pump shaft 200 and the first throttle plate 131 and the second throttle plate 141, so that when liquid flows, the liquid can enter the first balance cavity 130 and the second balance cavity 140 through the gaps, so that the pressure of the first balance cavity 130 is always equal to or slightly higher than the pressure in the second balance cavity 140.

The first bearing portion 500 includes a first bearing body 510 and a first bearing 520, a first annular spacer 511 is disposed at an inner side portion of the first bearing body 510, the first ring-shaped partition 511 partitions the inner side of the first bearing body 510 into a first receiving chamber 512 and a first cooling chamber 513, the first bearing 520 is accommodated in the first accommodating chamber 512, one end of the pump shaft 200 is disposed through the first bearing 520, the first bearing body 510 is provided with a first inlet hole 514 and a first outlet hole 515, the first inlet hole 514 and the first outlet hole 515 are communicated with the first cooling chamber 513, a first connection pipe 700 is connected to the middle of the balance pipe 150, the first connection pipe 700 is communicated with the first inlet hole 514, so that the liquid in the first balance cavity 130 and/or the second balance cavity 140 enters the first cooling cavity 513 through the balance pipe 150 and the first connection pipe 700, so as to cool the first bearing 520.

The second bearing portion 600 includes a second bearing body 610 and a second bearing 620, a second annular spacer 611 is disposed at an inner side portion of the second bearing body 610, the second annular spacer 611 partitions the inner side of the second bearing body 610 into a second receiving cavity 612 and a second cooling cavity 613, the second bearing 620 is received in the second receiving cavity 612, one end of the pump shaft 200 is disposed through the second bearing 620, the second bearing body 610 is provided with a second inlet hole 614 and a second outlet hole 615, and the second inlet hole 614 and the second outlet hole 615 are disposed in communication with the second cooling cavity 613; a second connecting pipe 800 is arranged between the first outlet hole 515 and the second inlet hole 614, one end of the second connecting pipe 800 is arranged on the first bearing body 510 and is communicated with the first cooling cavity 513, the other end of the second connecting pipe 800 is arranged on the second bearing body 610 and is communicated with the second cooling cavity 613, and liquid in the first cooling cavity 513 enters the second cooling cavity 613 through the second connecting pipe 800, so that the second bearing 620 is cooled, and the service life of the second bearing 520 is effectively prolonged.

In one embodiment, the second bearing body 610 is provided with a third connecting pipe 900 at the second outlet hole 615, and the third connecting pipe 900 discharges the liquid in the second cooling cavity 613, so that the liquid in the first cooling cavity 513 and the second cooling cavity 613 can be continuously replaced, thereby more efficiently performing the cooling operation on the first bearing 520 and the second bearing 620 and effectively prolonging the service life of the second bearing 620.

In one embodiment, the first connection pipe 700 is provided with a switch valve 710 for performing a turn-off or turn-on operation on the liquid delivered from the balance pipe 150 to the first connection pipe 700; when there is no need to cool the first bearing 520 and the second bearing 620, the switching valve 710 is turned off to prevent the liquid from flowing into the first cooling chamber 513 through the first connection pipe 700.

In one embodiment, the first bearing body 510 includes a first bearing seat 501 and a first sealing plate 502, the first bearing seat 501 is disposed in an abutting relationship with the first sealing plate 502 to seal the first cooling chamber 513, so as to prevent the liquid in the first cooling chamber 513 from flowing to the outside and affecting the usability of the product; specifically, the first bearing seat 501 is provided with first butt blocks 516 at intervals in the first cooling chamber 513, a first butt hole 517 is provided on the first butt block 516, a first fixing hole 518 is provided on the first sealing plate 502, and the first butt hole 517 and the first fixing hole 518 are provided in a matching manner; the first butt-joint block 516 is fixedly connected with the first sealing plate 502 through a first bolt 519, and the first bolt 519 penetrates through the first fixing hole 518 and then is clamped in the first butt-joint hole 517 so as to ensure stable butt-joint of the first bearing seat 501 and the first sealing plate 502.

The first bearing unit 510 has a first fixing protrusion 530 extending from the circumferential side thereof, the first fixing protrusion 530 is formed in a semicircular ring shape to conform to the cross-sectional shape of the side portion of the lower housing 120, and the first fixing protrusion 530 is connected to the side portion of the lower housing 120 by a first bolt member, so that the stability of the connection between the first bearing unit 500 and the lower housing 120 is improved.

In one embodiment, the second bearing body 610 includes a second bearing seat 601 and a second sealing plate 602, where the second bearing seat 601 and the second sealing plate 602 are disposed in an abutting manner to perform a sealing operation on the second cooling cavity 613, so as to prevent liquid in the second cooling cavity 613 from flowing to the outside and affecting the usability of the product; specifically, the second bearing seat 601 is provided with a second docking block 606 at an interval in the second cooling chamber 613, the second docking block 606 is provided with a second docking hole 617, the second sealing plate 602 is provided with a second fixing hole 618, and the second docking hole 617 is arranged to match with the second fixing hole 618; the second docking block 606 is fixedly connected to the second sealing plate 602 by a second bolt 619, and the second bolt 619 penetrates through the second fixing hole 618 and then is clamped in the second docking hole 617, so as to ensure stable docking between the second bearing seat 601 and the second sealing plate 602.

The second bearing body 610 has a second fixing protrusion 630 extending outward from the circumferential side thereof, the second fixing protrusion 630 has a semicircular ring-shaped structure so as to be consistent with the cross-sectional shape of the side of the lower housing 120, and the second fixing protrusion 630 is connected to the side of the lower housing 120 via a second bolt, thereby improving the stability of the connection between the second bearing part 600 and the lower housing 120.

In one embodiment, a support plate 180 is disposed within the pump housing body 100, the support plate 180 divides the pump chamber 400 into a first cavity 410 and a second cavity 420, and the pump shaft 200 is disposed through the support plate 180; specifically, an upper support plate 181 is arranged in the upper housing 110, a lower support plate 182 is arranged in the lower housing 120, the upper support plate 181 is in butt joint with the lower support plate 182, and the upper support plate 181 and the lower support plate 182 are combined to form a support plate 180 structure.

The guide vane assemblies 300 in the first cavity 410 divide the first cavity 410 into a first-stage water suction chamber 411, a plurality of first transition flow passages 412 and a middle flow passage 413 from left to right in sequence, the guide vane assemblies 300 in the second cavity 420 divide the second cavity 420 into a second-stage water suction chamber 421, at least one second transition flow passage 422 and a water outlet flow passage 423 from right to left in sequence, the lower shell 120 is provided with a water suction port 121 and a water outlet port 122, the water suction port 121 is communicated with the first-stage water suction chamber 411, the water outlet port 122 is communicated with the water outlet flow passage 423, the water outlet port 111 is communicated with the middle flow passage 413, and the water inlet port 112 is communicated with the second-stage water suction chamber 421.

When the impeller 210 rotates synchronously with the pump shaft 200, external liquid enters the primary water suction chamber 411 from the water suction port 121, works on the liquid by the rotation of the impeller 210, so that the energy of the liquid is increased, the liquid entering the primary water suction chamber 411 enters the intermediate flow passage 413 after passing through the plurality of first transition flow passages 412 in sequence, the liquid in the intermediate flow passage 413 is conveyed to the secondary water suction chamber 421 by the conduction pipe 113, the liquid continues to work by the rotation of the impeller 210, so that the energy of the liquid is further increased, the liquid entering the secondary water suction chamber 421 passes through the at least one second transition flow passage 422 in sequence and then enters the water outlet flow passage 423, and finally the liquid is continuously sent out from the water outlet 122.

In one embodiment, a ring cylinder 190 is disposed on the support plate 180, a support ring groove 191 is disposed on the ring cylinder 190, and the pump shaft 200 is disposed through the support ring groove 191; specifically, an upper ring column 1901 is disposed in the middle of the upper support plate 181, a lower ring column 1902 is disposed in the middle of the lower support plate 182, the upper ring column 1901 is in butt joint with the lower ring column 1902, and the upper ring column 1901 and the lower ring column 1902 form a ring column 190 structure.

It should be noted that the mechanical seal assembly, impeller 210, is of conventional construction, and does not relate to the inventive point of the present invention per se, and the solutions in the prior art can be adopted; in this embodiment, the impeller 210 may be mounted on the pump shaft 200 in a snap-fit manner to rotate together with the pump shaft 200, and the impeller 210 in the first cavity 410 and the impeller 210 in the second cavity 420 are oppositely mounted on the pump shaft 200, so that the axial force borne by the pump shaft 200 maintains a balanced state as much as possible.

When the pump works, the external driving device drives the pump shaft 200 to rotate, the pump shaft 200 drives the inner rings on the first bearing 520 and the second bearing 620 to rotate together when rotating, and the rotation of the inner rings can enable the first bearing 520 and the second bearing 620 to generate heat, so that the temperature of the first bearing 520 and the second bearing 620 rises when in operation; the impeller 210 rotates synchronously with the pump shaft 200, external liquid enters the primary water suction chamber 411 from the water suction port 121, works on the liquid through the rotation of the impeller 210 to increase the energy of the liquid, the liquid entering the primary water suction chamber 411 enters the intermediate flow passage 413 after sequentially passing through the plurality of first transition flow passages 412, the liquid in the intermediate flow passage 413 is conveyed to the secondary water suction chamber 421 through the conduction pipe 113, the liquid continues to work through the rotation of the impeller 210 to further increase the energy of the liquid, the liquid entering the secondary water suction chamber 421 sequentially passes through the at least one second transition flow passage 422 and then enters the water outlet flow passage 423, and finally the liquid is continuously sent out from the water outlet 122; while the liquid flows in the pump chamber 400, a small amount of liquid enters the first balance cavity 130 and the second balance cavity 140 through the gap between the pump shaft 200 and the first throttle plate 131 and the second throttle plate 141, and then enters the first cooling cavity 513 through the balance pipe 150 and the first connecting pipe 700, so that the first bearing 520 is cooled; in addition, the liquid in the first cooling chamber 513 enters the second cooling chamber 613 through the second connecting pipe 800, so that the second bearing 620 is cooled, and the service life of the bearing is effectively prolonged.

In summary, in the multi-stage pump-in bearing cooling structure of the present invention, the first bearing body 510 is provided with the first inlet hole 514 and the first outlet hole 515, the second bearing body 610 is provided with the second inlet hole 614 and the second outlet hole 615, one end of the first connecting pipe 700 is connected to the balance pipe 150, the other end of the first connecting pipe 700 is connected to the first inlet hole 514, and the second connecting pipe 800 is connected to the first outlet hole 515 and the second inlet hole 614, so that the liquid in the first balance cavity 130 and/or the second balance cavity 140 enters the first cooling cavity 513 via the balance pipe 150 and the first connecting pipe 700 to perform the cooling treatment on the first bearing 520, and the liquid enters the second cooling cavity 613 from the first cooling cavity 513 via the second connecting pipe 800 to perform the cooling treatment on the second bearing 620, thereby effectively prolonging the service life of the bearing.

The above examples are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. The utility model provides a multistage well pump bearing cooling structure which characterized in that: the pump casing comprises a pump casing body and a pump shaft, wherein the pump casing body is formed by assembling an upper casing and a lower casing, a pump cavity is formed by enclosing the upper casing and the lower casing, and the pump shaft is arranged in the pump cavity; the two ends of the lower shell are respectively provided with a first bearing part and a second bearing part, and the two ends of the pump shaft are respectively clamped in the first bearing part and the second bearing part; a first balance cavity and a second balance cavity are respectively arranged at two ends of the pump shell body on one side of the first bearing part and one side of the second bearing part, and a balance pipe is arranged between the first balance cavity and the second balance cavity;

2. The multi-stage split pump bearing cooling structure of claim 1, wherein: and a third connecting pipe is arranged at the second outlet of the second bearing body.

3. The multi-stage split pump bearing cooling structure of claim 1, wherein: and a switch valve is arranged on the first connecting pipe.

4. The multi-stage split pump bearing cooling structure according to any one of claims 1 to 3, wherein: the first bearing body comprises a first bearing seat and a first sealing plate, the first bearing seat is in butt joint with the first sealing plate, the second bearing body comprises a second bearing seat and a second sealing plate, and the second bearing seat is in butt joint with the second sealing plate.

5. The multi-stage split pump bearing cooling structure of claim 4, wherein: the first bearing seat is provided with first butt-joint blocks at intervals in a first cooling cavity, the first butt-joint blocks are provided with first butt-joint holes, the first sealing plate is provided with first fixing holes, and the first butt-joint holes are matched with the first fixing holes; the first butt joint block is fixedly connected with the first sealing plate through a first bolt, and the first bolt penetrates through the first fixing hole and then is clamped in the first butt joint hole; the second bearing seat is provided with second butt joint blocks at intervals in a second cooling cavity, the second butt joint blocks are provided with second butt joint holes, the second sealing plate is provided with second fixing holes, and the second butt joint holes are matched with the second fixing holes; the second butt joint block is fixedly connected with the second sealing plate through a second bolt, and the second bolt penetrates through the second fixing hole and then is clamped in the second butt joint hole.

6. The multi-stage split pump bearing cooling structure according to any one of claims 1 to 3, wherein: a first fixing bump extends outwards from the peripheral side of the first bearing body, the first fixing bump is of a semicircular structure, and the first fixing bump is connected with the side of the lower shell through a first bolt; the second bearing body extends outwards in the peripheral side to form a second fixing protruding block, the second fixing protruding block is of a semicircular structure, and the second fixing protruding block is connected with the lower shell through a second bolt piece.

7. The multi-stage axially split pump bearing cooling structure according to any one of claims 1 to 3, characterized in that: a first throttle plate and a first end cover are arranged at one side of a first bearing part at two ends of the lower shell, a second throttle plate and a second end cover are arranged at one side of a second bearing part at the lower shell, the first balance cavity is formed by the first throttle plate, the first end cover and the upper shell in an enclosing manner, and one end of the balance pipe is arranged on the upper shell and is communicated with the first balance cavity; the second balance cavity is formed by enclosing the second throttle plate, the second end cover and the upper shell, and the other end of the balance pipe is arranged on the upper shell and communicated with the second balance cavity; the pump shaft penetrates through the first throttle plate, the first end cover, the second throttle plate and the second end cover respectively, and gaps are formed between the pump shaft and the first throttle plate and between the pump shaft and the second throttle plate respectively.

8. The multi-stage axially split pump bearing cooling structure according to any one of claims 1 to 3, characterized in that: the pump casing body is characterized in that mechanical seal cavities are arranged at the two ends of the pump casing body on the inner sides of the first balance cavity and the second balance cavity, and a mechanical seal flushing pipe is connected between the two mechanical seal cavities.

9. The multi-stage axially split pump bearing cooling structure according to any one of claims 1 to 3, characterized in that: a support plate is arranged in the pump shell body, the support plate divides the pump cavity into a first cavity and a second cavity, and the pump shaft penetrates through the support plate; an upper support plate is arranged in the upper shell, a lower support plate is arranged in the lower shell, the upper support plate and the lower support plate are arranged in a butt joint mode, and the upper support plate and the lower support plate form a support plate structure; the supporting plate is provided with a ring cylinder body, a supporting ring groove is formed in the ring cylinder body, and the pump shaft penetrates through the supporting ring groove.

10. The multi-stage axially split pump bearing cooling structure according to claim 9, wherein: the guide vane assembly is fixedly arranged in a pump cavity, impellers are arranged on the pump shaft at intervals, and the guide vane assembly is sleeved on the outer side of each impeller; the upper shell is provided with a water outlet port and a water inlet port, and the water outlet port is communicated with the water inlet port through a conduction pipe; be in a plurality of in first cavity stator assembly will first cavity divide into first order water absorption chamber, a plurality of first transition runner and middle runner in proper order, be in a plurality of in the second cavity stator assembly will second cavity divide into secondary water absorption chamber, at least one second transition runner and water outlet flow way in proper order, water sucking mouth and delivery port have been seted up on the casing down, water sucking mouth and first order water absorption chamber intercommunication set up, delivery port and water outlet flow way intercommunication set up, water outlet port and middle runner intercommunication set up, water inlet port and secondary water absorption chamber intercommunication set up.