CN108799108B

CN108799108B - Pump body assembly, fluid machinery and heat exchange equipment

Info

Publication number: CN108799108B
Application number: CN201810793003.3A
Authority: CN
Inventors: 魏会军; 徐嘉; 杜忠诚; 李直; 杨森; 梁社兵; 任丽萍; 张荣婷; 史正良; 刘喜兴
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2018-07-18
Filing date: 2018-07-18
Publication date: 2024-06-18
Anticipated expiration: 2038-07-18
Also published as: CN108799108A

Abstract

The invention provides a pump body assembly, a fluid machine and heat exchange equipment. Wherein, pump body subassembly includes: an upper flange; an upper limit plate; the upper limiting plate is positioned between the upper flange and the air cylinder; the piston assembly is arranged in the cylinder and comprises a piston sleeve and a piston arranged in the piston sleeve in a sliding manner, the upper end face of the piston sleeve is provided with a first extension part, and the first extension part stretches into the central hole of the upper limiting plate and is in limiting fit with the lower end face of the upper flange so as to prevent the piston sleeve from displacing relative to the upper flange in the radial direction. The invention effectively solves the problems that the piston sleeve of the pump body assembly is easy to eccentrically rotate and the working efficiency of the pump body assembly is influenced in the prior art.

Description

Pump body assembly, fluid machinery and heat exchange equipment

Technical Field

The invention relates to the technical field of pump body components, in particular to a pump body component, a fluid machine and heat exchange equipment.

Background

At present, in the operation process of the pump body assembly, the piston sleeve is easy to eccentric and obliquely rotate, so that the piston sleeve is easy to rub with the cylinder and the piston, and the working efficiency and the working performance of the pump body assembly are seriously affected.

Disclosure of Invention

The invention mainly aims to provide a pump body assembly, a fluid machine and heat exchange equipment, so as to solve the problem that a piston sleeve of the pump body assembly is easy to eccentrically rotate and the working efficiency of the pump body assembly is influenced in the prior art.

In order to achieve the above object, according to one aspect of the present invention, there is provided a pump body assembly comprising: an upper flange; an upper limit plate; the upper limiting plate is positioned between the upper flange and the air cylinder; the piston assembly is arranged in the cylinder and comprises a piston sleeve and a piston arranged in the piston sleeve in a sliding manner, the upper end face of the piston sleeve is provided with a first extension part, and the first extension part stretches into the central hole of the upper limiting plate and is in limiting fit with the lower end face of the upper flange so as to prevent the piston sleeve from displacing relative to the upper flange in the radial direction.

Further, the lower end face of the upper flange is provided with a concave part, and the first extension part extends into the concave part and is limited and stopped with the concave part in the radial direction of the piston sleeve.

Further, the lower end face of the upper flange is provided with a limiting part extending towards the piston sleeve, and the limiting part and the first extending part limit the stop, so that the piston sleeve is prevented from displacing in the radial direction relative to the upper flange.

Further, the pump body assembly further comprises a lower flange positioned below the piston assembly and a lower wear-reducing ring arranged in the cylinder, wherein the surface, facing the lower flange, of the piston sleeve is provided with a limiting protrusion, the lower wear-reducing ring is provided with a central hole, and the limiting protrusion extends into the central hole and is in limiting stop with the lower flange so as to prevent the piston sleeve from displacing in the radial direction relative to the lower flange.

Further, the surface of the lower flange facing the piston sleeve is provided with a second limiting groove, and the limiting protrusion stretches into the second limiting groove so as to prevent the piston sleeve from displacing in the radial direction relative to the lower flange.

Further, the surface of the lower flange facing the piston sleeve is provided with a second extension part, and the second extension part and the limiting protrusion limit the stop, so that the piston sleeve is prevented from displacing relative to the lower flange in the radial direction.

Further, the second extension portion is located outside the limit projection.

Further, the second extension portion is located inside the limit projection.

Further, the limiting bulge is a convex ring extending towards the lower flange, and the convex ring and the piston sleeve are coaxially arranged.

Further, the limit protrusions are a plurality of bosses extending towards the lower flange, and the bosses are arranged at intervals along the circumferential direction of the piston sleeve.

Further, the pump body assembly further comprises a structural member positioned below the air cylinder, and the lower end face of the piston sleeve is provided with a limiting protrusion which is in limiting fit with the structural member so as to prevent the piston sleeve from displacing in the radial direction relative to the structural member.

Further, the structural member below the cylinder is a lower flange.

Further, the surface of the lower flange facing the piston sleeve is provided with a second limit groove, and the limit protrusion extends into the second limit groove so as to prevent the piston sleeve from displacing in the radial direction relative to the lower flange.

Further, the structure comprises a lower flange and a lower limiting plate, the lower limiting plate and the lower flange are both positioned below the air cylinder, the lower limiting plate is positioned between the air cylinder and the lower flange, and the limiting protrusion and the lower limiting plate are limited to stop, so that the piston sleeve is prevented from displacing in the radial direction relative to the lower limiting plate.

Further, the limiting protrusion extends into the central hole of the lower limiting plate and is in limiting fit with the inner surface of the central hole of the lower limiting plate.

Further, the surface of the lower limiting plate facing the piston sleeve is provided with a third limiting groove, and the limiting protrusion extends into the third limiting groove and is limited by the third limiting groove.

Further, the pump body assembly further includes: the lower flange is positioned below the piston assembly; the rotating shaft penetrates through the upper flange, the upper limiting plate, the piston sleeve and the lower flange in sequence, and the rotating shaft is coaxially arranged with the upper flange and the lower flange.

According to another aspect of the present invention, there is provided a fluid machine comprising the pump body assembly described above.

According to another aspect of the present invention there is provided a heat exchange device comprising a fluid machine as described above.

By applying the technical scheme of the invention, the pump body assembly comprises an upper flange, an upper limiting plate, a cylinder and a piston assembly. Wherein, go up the limiting plate and be located between flange and the cylinder. The piston assembly is arranged in the cylinder, the piston assembly comprises a piston sleeve and a piston arranged in the piston sleeve in a sliding manner, the upper end face of the piston sleeve is provided with a first extension part, and the first extension part stretches into a central hole of the upper limiting plate and is in limiting fit with the lower end face of the upper flange so as to prevent the piston sleeve from displacing in the radial direction relative to the upper flange. Like this, in pump body subassembly operation in-process, the first extension of piston sleeve stretches into the centre bore of limiting plate and with the spacing cooperation of the lower terminal surface of last flange, go up the flange and play spacing, the effect of support to the piston sleeve, and then prevent that the piston sleeve from taking place radial direction's removal in the operation in-process, guarantee that the piston sleeve can normally rotate, solved the piston sleeve of the pump body subassembly among the prior art easily take place eccentric rotation, influence pump body subassembly work efficiency's problem, promoted pump body subassembly's operational reliability and working property.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

FIG. 1 shows a schematic exploded view of a first embodiment of a pump body assembly according to the present invention;

FIG. 2 shows a cross-sectional view of the pump body assembly of FIG. 1;

FIG. 3 shows a bottom view of an upper flange of the pump body assembly of FIG. 1;

FIG. 4 shows a cross-sectional view of a piston sleeve of the pump body assembly of FIG. 1;

FIG. 5 shows a schematic exploded view of a second embodiment of a pump body assembly according to the present invention;

FIG. 6 shows a cross-sectional view of the pump body assembly of FIG. 5;

FIG. 7 shows a schematic perspective view of the upper flange of the pump body assembly of FIG. 5;

FIG. 8 shows a schematic perspective view of a piston sleeve of the pump body assembly of FIG. 5;

FIG. 9 shows a schematic exploded view of a third embodiment of a pump body assembly according to the present invention;

FIG. 10 shows a cross-sectional view of the pump body assembly of FIG. 9;

FIG. 11 shows a bottom view of an upper flange of the pump body assembly of FIG. 9;

FIG. 12 shows a top view of the lower flange of the pump body assembly of FIG. 9;

FIG. 13 shows a schematic exploded view of a fourth embodiment of a pump body assembly according to the present invention;

FIG. 14 shows a cross-sectional view of the pump body assembly of FIG. 13;

FIG. 15 shows a schematic perspective view of the upper flange of the pump body assembly of FIG. 13;

FIG. 16 shows a top view of the lower flange of the pump body assembly of FIG. 13;

FIG. 17 shows a cross-sectional view of the lower flange of FIG. 16;

FIG. 18 shows an exploded view of a fifth embodiment of a pump body assembly according to the present invention;

FIG. 19 shows a cross-sectional view of the pump body assembly of FIG. 18;

FIG. 20 shows a schematic perspective view of the upper flange of the pump body assembly of FIG. 18;

FIG. 21 shows an exploded view of a sixth embodiment of a pump body assembly according to the present invention;

FIG. 22 shows a cross-sectional view of the pump body assembly of FIG. 21;

FIG. 23 shows a schematic perspective view of an upper flange of the pump body assembly of FIG. 21;

FIG. 24 shows a cross-sectional view of a piston sleeve of the pump body assembly of FIG. 21;

FIG. 25 shows an exploded view of a seventh embodiment of a pump body assembly according to the present invention;

FIG. 26 shows a cross-sectional view of the pump body assembly of FIG. 25;

FIG. 27 shows a schematic perspective view of an upper flange of the pump body assembly of FIG. 25;

FIG. 28 shows a top view of the lower stop plate of the pump body assembly of FIG. 25;

FIG. 29 shows a cross-sectional view of the lower stop plate of FIG. 28; and

Fig. 30 shows a cross-sectional view of a piston sleeve of the pump body assembly of fig. 25.

Wherein the above figures include the following reference numerals:

11. An upper flange; 111. a concave portion; 112. a limit part; 12. a lower flange; 121. the second limit groove; 122. a second extension; 13. a lower limit plate; 131. the third limit groove; 14. an upper limit plate; 20. a cylinder; 30. a rotating shaft; 40. a piston sleeve; 41. a first extension; 43. a limit protrusion; 50. a piston; 60. and a lower wear ring.

Detailed Description

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.

It is noted that all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs unless otherwise indicated.

In the present invention, unless otherwise indicated, terms of orientation such as "upper" and "lower" are used generally with respect to the orientation shown in the drawings or to the vertical, vertical or gravitational orientation; also, for ease of understanding and description, "left, right" is generally directed to the left, right as shown in the drawings; "inner and outer" refer to inner and outer relative to the outline of the components themselves, but the above-described orientation terms are not intended to limit the present invention.

The application provides a pump body assembly, a fluid machine and heat exchange equipment, and aims to solve the problem that a piston sleeve of the pump body assembly in the prior art is easy to eccentrically rotate and affects the working efficiency of the pump body assembly.

Example 1

As shown in fig. 1 and 2, the pump body assembly includes an upper flange 11, an upper limiting plate 14, a cylinder 20, and a piston assembly. Wherein the upper limiting plate 14 is located between the upper flange 11 and the cylinder 20. The piston assembly is disposed in the cylinder 20, and the piston assembly includes a piston sleeve 40 and a piston 50 slidably disposed in the piston sleeve 40, wherein an upper end surface of the piston sleeve 40 has a first extension portion 41, and the first extension portion 41 extends into a central hole of the upper limiting plate 14 and is in limiting fit with a lower end surface of the upper flange 11, so as to prevent the piston sleeve 40 from being displaced relative to the upper flange 11 in a radial direction.

By applying the technical scheme of the embodiment, in the operation process of the pump body assembly, the first extension part 41 of the piston sleeve 40 stretches into the central hole of the upper limit plate 14 and is in limit fit with the lower end face of the upper flange 11, the upper flange 11 plays a role in limiting and supporting the piston sleeve 40, further, the piston sleeve 40 is prevented from moving in the radial direction in the operation process, the piston sleeve 40 is ensured to normally rotate, the problems that the piston sleeve of the pump body assembly is easy to eccentrically rotate and the working efficiency of the pump body assembly is influenced in the prior art are solved, and the operation reliability and the working performance of the pump body assembly are improved.

As shown in fig. 1, 3 and 4, the lower end surface of the upper flange 11 has a recess 111, and the first extension 41 extends into the recess 111 and comes into a limit stop with the recess 111 in the radial direction of the piston sleeve 40. Specifically, the upper flange 11 is fixedly connected with the upper limiting plate 14, and the first extension portion 41 of the piston sleeve 40 extends into the central hole of the upper limiting plate 14 and is in limit stop with the concave portion 111 of the upper flange 11, so that radial limit of the upper flange 11 to the piston sleeve 40 is realized. In the operation process of the pump body assembly, the concave part 111 and the first extension part 41 limit the stop, so that the first extension part 41 is guaranteed to rotate in the concave part 111, and the first extension part 41 cannot shift in the radial direction, so that the upper flange 11 is used for limiting and supporting the upper end of the piston sleeve 40, the piston sleeve 40 is prevented from eccentric and oblique rotation, the normal operation of the pump body assembly is guaranteed, and the working reliability of the pump body assembly is improved.

In the present embodiment, the first extension portion 41 and the recess 111 are annular, and the first extension portion 41, the recess 111, and the piston sleeve 40 are coaxially disposed. Thus, the piston sleeve 40 is eccentrically disposed from the upper flange 11, and the eccentric amount is the eccentric amount e of the pump body assembly. In this way, the first extension portion 41 of the piston sleeve 40 can rotate around the central axis of the piston sleeve 40 (or the central axis of the recess 111) in the recess 111 of the upper flange 11, so as to ensure the limit and support reliability of the upper flange 11 to the piston sleeve 40.

The structure of the first extension 41 is not limited to this. Optionally, the first extension 41 is a double-layer annular structure, and at least one layer of annular structure performs a limit stop with the inner groove wall or the outer groove wall of the recess 111. Thus, the above arrangement makes the structure of the first extension portion 41 more diversified, and further makes the processing and manufacturing of the piston sleeve 40 easier and simpler, and reduces the labor intensity of the staff.

In other embodiments not shown in the drawings, the first extension is a plurality of boss structures, and the plurality of bosses are disposed at intervals along the circumferential direction of the piston sleeve.

In the present embodiment, the recess 111 is a groove. The structure is simple and easy to process and realize.

In the present embodiment, the groove width of the groove is larger than the thickness of the first extension 41. Like this, above-mentioned setting guarantees that first extension 41 is located the recess, and then guarantees that the recess can carry out limit stop to first extension 41, promotes the spacing reliability of flange 11 to piston sleeve 40, promotes the operational reliability of pump body subassembly.

In the present embodiment, a first predetermined distance is provided between the inner wall of the groove and the surface of the first extension 41 on the side near the center of the piston sleeve 40, and the first predetermined distance is 5um or more and 40um or less. Specifically, the inner groove wall of the groove performs a limit stop on the surface of the first extension 41 on the side close to the center of the piston sleeve 40, preventing radial displacement therebetween. Meanwhile, in order to ensure that the piston sleeve 40 can normally rotate, a first preset distance is reserved between the inner side groove wall of the groove and the surface of the first extension part 41, which is close to the center side of the piston sleeve 40, so that the groove can radially limit the first extension part 41, the first extension part 41 can rotate relative to the groove, and the running reliability of the pump body assembly is further improved.

In the present embodiment, the concave portion 111 is provided eccentrically to the upper flange 11, and the eccentric amount is e. Therefore, the eccentric amount of the pump body assembly is determined in the mode, so that the eccentric amount of the pump body assembly is easier to ensure, and the determination of the eccentric amount e is more reliable and simpler.

As shown in fig. 1 and 2, the pump body assembly further includes a lower flange 12 and a shaft 30. Wherein the lower flange 12 is located below the piston assembly. The rotating shaft 30 sequentially penetrates through the upper flange 11, the upper limiting plate 14, the piston sleeve 40 and the lower flange 12, and the rotating shaft 30 is coaxially arranged with the upper flange 11 and the lower flange 12. During operation of the pump body assembly, the rotary shaft 30 rotates around the central axis of the upper flange 11, the piston sleeve 40 rotates around the central axis of the concave part 111, the piston 50 only reciprocates relative to the piston sleeve 40, the piston 50 reciprocates relative to the rotary shaft 30, and the two reciprocating motions are mutually perpendicular, namely, the operation of the pump body assembly follows the principle of a cross slide block mechanism. With the reciprocating motion between the piston 50 and the piston sleeve 40, the head cambered surface of the piston 50, the inner surface of the cylinder 20, and the two cavity volumes formed between the guide holes of the piston sleeve 40 gradually change, thus completing the air suction, compression and exhaust processes.

In this embodiment, the surface of the lower flange 12 facing the piston sleeve 40 has an eccentric boss, and the eccentric boss can extend into the piston sleeve 40 to limit the piston sleeve 40 in the radial direction, so as to prevent the displacement of the lower end of the piston sleeve 40 in the radial direction relative to the cylinder 20 and the rotating shaft 30, thereby affecting the operation reliability of the pump body assembly.

The structure of the lower flange 12 is not limited to this. In other embodiments not shown in the drawings, the surface of the lower flange facing the piston sleeve is a plane having a predetermined distance from the lower end surface of the piston sleeve.

The application also provides a fluid machine (not shown) comprising a pump body assembly as described above. Alternatively, the fluid machine is a compressor.

The application also provides a heat exchange device (not shown) comprising a fluid machine as described above. Optionally, the heat exchange device is an air conditioner.

Example two

The pump body assembly in the second embodiment is different from the first embodiment in that: the upper flange 11 and the lower flange 12 are different in structure.

As shown in fig. 5 to 8, the lower end surface of the upper flange 11 has a limiting portion 112 extending toward the piston sleeve 40, and the limiting portion 112 is limited to stop against the first extending portion 41 to prevent the piston sleeve 40 from being displaced in a radial direction relative to the upper flange 11. In the operation process of the pump body assembly, the side surface of the first extension part 41 and the side surface of the limiting part 112 can be in limiting fit, radial displacement between the two is prevented, further, the piston sleeve 40 is prevented from being displaced in the radial direction relative to the upper flange 11, stable operation of the piston sleeve 40 is ensured, and the operation reliability and the working efficiency of the pump body assembly are improved.

As shown in fig. 6, the stopper 112 is located inside the first extension 41. Specifically, the outer side of the stopper 112 performs a stopper to the surface of the first extension 41 on the side close to the center of the piston sleeve 40, preventing radial displacement therebetween.

Alternatively, a second predetermined distance is provided between the outer side surface of the limiting portion 112 and the surface of the first extending portion 41 on the side close to the center of the piston sleeve 40, and the second predetermined distance is greater than or equal to 5um and less than or equal to 40um. Like this, the above-mentioned numerical range both guarantees that spacing portion 112 can radially spacing to first extension portion 41, still makes first extension portion 41 can rotate for spacing portion 112, and then promotes the operational reliability of pump body subassembly.

In other embodiments not shown in the drawings, the limiting portion is located outside the first extending portion. Specifically, the inner side of the first extension part faces the surface of the side, far away from the center of the piston sleeve, of the limiting part to carry out limiting stop, so that radial displacement between the limiting part and the surface is prevented.

Alternatively, the limiting portion 112 has a ring-shaped structure.

Alternatively, the limiting portion 112 is eccentrically disposed on the upper flange 11, and the eccentric amount is e.

The structure of the stopper 112 is not limited to this. Alternatively, the limiting portion 112 is formed of a plurality of circular arc segments, and the plurality of circular arc segments are eccentrically disposed on the upper flange 11 around the formed circle by an amount e.

In this embodiment, the surface of the lower flange 12 facing the piston sleeve 40 is planar.

Example III

The pump body assembly in the third embodiment differs from the second embodiment in that: the lower flange 12 is of different construction.

As shown in fig. 9 to 12, the pump body assembly further includes a lower flange 12 located below the piston assembly, the surface of the lower flange 12 facing the piston sleeve 40 has a second limiting groove 121, and the limiting protrusion 43 extends into the second limiting groove 121 to prevent the piston sleeve 40 from being displaced in a radial direction relative to the lower flange 12. In this way, the lower flange 12 is in limit fit with the limit projection 43 of the piston sleeve 40 to limit the piston sleeve 40 in the radial direction. Meanwhile, the upper end of the piston sleeve 40 is supported by the upper flange 11 in a limiting manner, so that the upper end and the lower end of the piston sleeve 40 are supported in a limiting manner, the influence on the normal operation of the pump body assembly caused by structural interference between the piston sleeve 40 and the piston 50 or the cylinder 20 is avoided, and the operation reliability and the working performance of the pump body assembly are improved.

Specifically, the second limiting groove 121 is eccentrically disposed on the lower flange 12, and the limiting protrusion 43 extends into the second limiting groove 121, and the limiting protrusion 43 can limit and stop with the inner or outer groove wall of the second limiting groove 121, so as to realize the limit stop of the lower flange 12 on the piston sleeve 40.

Optionally, the second limiting groove 121 is an annular groove. The structure is simple and easy to realize.

Example IV

The pump body assembly in the fourth embodiment differs from that in the third embodiment in that: the pump body components are structurally different.

As shown in fig. 13 to 17, the pump body assembly further includes a lower flange 12 located below the piston assembly and a lower wear ring 60 disposed in the cylinder 20, the surface of the piston sleeve 40 facing the lower flange 12 has a limiting protrusion 43, the lower wear ring 60 has a central hole, and the limiting protrusion 43 extends into the central hole and is in limiting stop with the lower flange 12 to prevent the piston sleeve 40 from being displaced in a radial direction relative to the lower flange 12. Thus, the limiting protrusion 43 extends into the central hole of the lower wear ring 60 and is in limiting fit with the lower flange 12, so that the lower flange 12 can limit the piston sleeve 40 in the radial direction, so as to limit the lower end of the piston sleeve 40. Meanwhile, the upper end of the piston sleeve 40 is supported by the upper flange 11 in a limiting manner, so that the upper end and the lower end of the piston sleeve 40 are supported in a limiting manner, the influence on the normal operation of the pump body assembly caused by structural interference between the piston sleeve 40 and the piston 50 or the cylinder 20 is avoided, and the operation reliability and the working performance of the pump body assembly are improved.

Specifically, the outer surface of the lower wear ring 60 is matched with the inner circular surface of the cylinder 20, the inner surface of the lower wear ring 60 is matched with the limit protrusion 43 of the piston sleeve 40, the lower wear ring 60 rotates relative to the cylinder 20 and the limit protrusion 43, and the rotation speed of the lower wear ring 60 relative to the cylinder 20 and the rotation speed of the lower wear ring 60 relative to the limit protrusion 43 are smaller than the rotation speed of the rotating shaft 30, and the power consumption of the pump body assembly is reduced due to the fact that the power consumption of the friction pair is proportional to the square of the rotation speed.

As shown in fig. 16 and 17, the surface of the lower flange 12 facing the piston sleeve 40 has a second limiting groove 121, and the limiting protrusion 43 extends into the second limiting groove 121 to prevent the piston sleeve 40 from being displaced in a radial direction relative to the lower flange 12. Specifically, the limiting protrusion 43 extends into the central hole of the lower wear ring 60 and is in limiting stop with the second limiting groove 121 on the lower flange 12, so as to limit the piston sleeve 40 in the radial direction, further ensure that the lower end of the piston sleeve 40 cannot displace in the radial direction relative to the lower flange 12, and improve the operational reliability of the pump body assembly.

Example five

The pump body assembly in the fifth embodiment differs from the fourth embodiment in that: the lower flange 12 is of different construction.

As shown in fig. 18 and 20, the surface of the lower flange 12 facing the piston sleeve 40 has a second extension 122, and the second extension 122 is stopped by the stop protrusion 43 to prevent the piston sleeve 40 from being displaced in the radial direction relative to the lower flange 12. Specifically, the limiting protrusion 43 extends into the central hole of the lower wear ring 60 and is in limiting stop with the second extending portion 122 on the lower flange 12, so as to limit the piston sleeve 40 in the radial direction, further ensure that the lower end of the piston sleeve 40 cannot displace in the radial direction relative to the lower flange 12, and improve the operational reliability of the pump body assembly.

As shown in fig. 19, the second extension 122 is located outside the limit projection 43. Specifically, the inner side of the second extension 122 performs a limit stop against the surface of the limit projection 43 on the side away from the center of the piston sleeve 40, preventing radial displacement therebetween.

Alternatively, the second extension 122 is an eccentric boss, and the amount of eccentricity between the eccentric boss and the lower flange 12 is e.

Alternatively, the limiting projection 43 is a collar extending toward the lower flange 12, and the collar is disposed coaxially with the piston sleeve 40. The structure is simple and easy to realize.

Note that the structure of the stopper projection 43 is not limited to this. Alternatively, the limiting projection 43 is a plurality of bosses extending toward the lower flange 12, and the plurality of bosses are disposed at intervals along the circumferential direction of the piston sleeve 40.

Example six

The pump body assembly in the sixth embodiment differs from that in the third embodiment in that: the pump body components are structurally different.

As shown in fig. 21 to 24, the pump body assembly further includes a structural member located below the cylinder 20, and the lower end surface of the piston sleeve 40 has a limiting protrusion 43, and the limiting protrusion 43 is in limiting fit with the structural member to prevent the piston sleeve 40 from being displaced in a radial direction relative to the structural member. Wherein, the structure includes lower flange 12 and lower limiting plate 13, lower limiting plate 13 and lower flange 12 all are located the below of cylinder 20, and lower limiting plate 13 is located between cylinder 20 and the lower flange 12, spacing protruding 43 and the spacing backstop of lower limiting plate 13 to prevent that piston sleeve 40 from taking place radial direction's displacement for lower limiting plate 13, the side of first extension 41 and the side spacing cooperation of the spacing portion 112 of upper flange 11, and then prevent piston sleeve 40 and take place radial direction's displacement for upper flange 11, guarantee the steady operation of piston sleeve 40, promote pump body subassembly's operational reliability and work efficiency. In this way, the upper end and the lower end of the piston sleeve 40 are respectively limited and stopped by the upper limiting plate 14 and the lower limiting plate 13 by the arrangement, so that the upper end and the lower end of the piston sleeve 40 cannot displace in the radial direction relative to the upper flange and the lower flange, the stable rotation of the piston sleeve 40 in the cylinder 20 is further ensured, and the operation reliability of the pump body assembly is improved.

As shown in fig. 22, the limiting projection 43 extends into the central hole of the lower limiting plate 13 and is in limiting engagement with the inner surface of the central hole of the lower limiting plate 13. Specifically, the lower limiting plate 13 is fixedly connected with the lower flange 12, the outer surface of the limiting protrusion 43 and the inner surface of the central hole of the lower limiting plate 13 are in limiting stop, so that the limiting stop of the lower limiting plate 13 to the limiting protrusion 43 (the piston sleeve 40) is realized, the piston sleeve 40 is prevented from displacing in the radial direction relative to the lower limiting plate 13 or the lower flange 12, and the operation reliability of the pump body assembly is further improved.

Example seven

The pump body assembly in the seventh embodiment differs from that in the sixth embodiment in that: the lower limiting plate 13 has different structures

As shown in fig. 25 to 30, the surface of the lower limiting plate 13 facing the piston sleeve 40 is provided with a third limiting groove 131, and the limiting protrusion 43 extends into the third limiting groove 131 and is in limiting stop with the third limiting groove 131. Specifically, the limiting protrusion 43 is in limiting fit with the groove wall of the third limiting groove 131, so that the lower limiting plate 13 limits the radial direction of the piston sleeve 40, the piston sleeve 40 operates more stably, and the operation reliability of the pump body assembly is improved.

From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

In the pump body assembly operation process, the first extension of piston sleeve stretches into the centre bore of limiting plate and with the spacing cooperation of lower terminal surface of last flange, go up the flange and play spacing, the effect of support to the piston sleeve, and then prevent that the piston sleeve from taking place radial direction's removal in the operation process, guarantee that the piston sleeve can normally rotate, solved the piston sleeve of the pump body assembly among the prior art easily take place eccentric rotation, influence pump body assembly work efficiency's problem, promoted pump body assembly's operational reliability and working property.

It will be apparent that the embodiments described above are merely some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A pump body assembly, comprising:

an upper flange (11);

An upper limit plate (14);

a cylinder (20), the upper limiting plate (14) is positioned between the upper flange (11) and the cylinder (20);

The piston assembly is arranged in the cylinder (20) and comprises a piston sleeve (40) and a piston (50) arranged in the piston sleeve (40) in a sliding manner, the upper end face of the piston sleeve (40) is provided with a first extension part (41), and the first extension part (41) stretches into a central hole of the upper limiting plate (14) and is in limit fit with the lower end face of the upper flange (11) so as to prevent the piston sleeve (40) from displacing relative to the upper flange (11) in the radial direction;

the lower end surface of the upper flange (11) is provided with a concave part (111), and the first extension part (41) extends into the concave part (111) and is in limit stop with the concave part (111) in the radial direction of the piston sleeve (40);

The pump body assembly further comprises a lower flange (12) positioned below the piston assembly and a lower wear-reducing ring (60) arranged in the cylinder (20), a limiting protrusion (43) is arranged on the surface, facing the lower flange (12), of the piston sleeve (40), the lower wear-reducing ring (60) is provided with a central hole, and the limiting protrusion (43) stretches into the central hole of the lower wear-reducing ring (60) and is in limiting stop with the lower flange (12), so that the piston sleeve (40) is prevented from being displaced relative to the lower flange (12) in the radial direction.

2. Pump body assembly according to claim 1, characterized in that the surface of the lower flange (12) facing the piston sleeve (40) has a second limit groove (121), the limit projection (43) extending into the second limit groove (121) to prevent displacement of the piston sleeve (40) in radial direction with respect to the lower flange (12).

3. Pump body assembly according to claim 1, characterized in that the surface of the lower flange (12) facing the piston sleeve (40) has a second extension (122), which second extension (122) comes into limit stop with the limit projection (43) to prevent displacement of the piston sleeve (40) in radial direction with respect to the lower flange (12).

4. A pump body assembly according to claim 3, wherein the second extension (122) is located outside the limit projection (43).

5. A pump body assembly according to claim 3, wherein the second extension (122) is located inside the limit projection (43).

6. Pump body assembly according to claim 1, characterized in that the limit projection (43) is a collar extending towards the lower flange (12), and in that the collar is arranged coaxially with the piston sleeve (40).

7. Pump body assembly according to claim 1, characterized in that the limit projection (43) is a plurality of bosses extending towards the lower flange (12), and in that a plurality of said bosses are arranged at intervals along the circumference of the piston sleeve (40).

8. The pump body assembly of claim 1, further comprising:

The rotating shaft (30), the rotating shaft (30) is sequentially arranged on the upper flange (11) in a penetrating mode, the upper limiting plate (14), the piston sleeve (40) and the lower flange (12) in a penetrating mode, and the rotating shaft (30) is coaxially arranged with the upper flange (11) and the lower flange (12).

9. A fluid machine comprising a pump body assembly according to any one of claims 1 to 8.

10. A heat exchange device comprising the fluid machine of claim 9.