CN217735745U

CN217735745U - Compressor

Info

Publication number: CN217735745U
Application number: CN202221729326.4U
Authority: CN
Inventors: 张赣波; 曹小军; 郭莉娟
Original assignee: Guangdong Meizhi Compressor Co Ltd
Current assignee: Guangdong Meizhi Compressor Co Ltd
Priority date: 2022-07-06
Filing date: 2022-07-06
Publication date: 2022-11-04
Anticipated expiration: 2032-07-06

Abstract

The utility model discloses a compressor, the compressor includes housing assembly, motor element, the first pump body, the second pump body and to well barrel, the first pump body includes first bearing and first bent axle, first bearing cup joints in the outside of first bent axle, the second pump body includes second bearing and second bent axle, the second bearing cup joints in the outside of second bent axle, motor element locates between the first pump body and the second pump body, install to well barrel through installing at housing assembly during the installation, install first bearing location in to well barrel along axial one end, install second bearing location in to well barrel along the axial other end, make first bent axle and second bent axle can use the centering barrel to realize the centering installation as the benchmark in the assembly, the centering installation accuracy of first bent axle and second bent axle has been improved, make the axiality precision of first bent axle and second bent axle higher, thereby be favorable to reducing the vibration of compressor, improve the stationarity and the reliability of compressor operation.

Description

Compressor

Technical Field

The utility model relates to a compressor technical field, in particular to compressor.

Background

In the related art, the rotary compressor widely adopts a single pump body structure, under the single pump body structure, a single motor drives a single crankshaft of a single pump body to compress a refrigerant for refrigeration, the main way of improving the discharge capacity of the rotary compressor is to increase the number of cylinders and the structural size of the cylinders, the former is limited by the assembly precision of the crankshaft, and the latter is limited by the cost and the weight. If increase the pump body quantity, then can be under the condition that does not change compressor main casing main casing body principal dimension, increase the discharge capacity of compressor by one time, its realization mode is to install two pump bodies respectively in the both sides of a motor, drags the bent axle of two pump bodies simultaneously with a motor and compresses the refrigerant. However, because one crankshaft is added to the compressor, the coaxiality of the two crankshafts is difficult to guarantee, and the reliability and the stability of the operation of the compressor are reduced, so that how to realize the centering installation of the two crankshafts in the assembly process of the double-pump compressor becomes a technical problem which needs to be solved urgently at present.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a compressor can realize the centering installation of two bent axles in assembling process, improves the axiality of two bent axles to improve compressor operation's stationarity and reliability.

The utility model discloses according to the utility model discloses compressor of first aspect embodiment, include:

a housing assembly having a cavity;

the first pump body is arranged in the cavity and comprises a first bearing and a first crankshaft, and the first bearing is sleeved on the outer side of the first crankshaft;

the second pump body is arranged in the cavity and comprises a second bearing and a second crankshaft, and the second bearing is sleeved on the outer side of the second crankshaft;

the motor assembly is arranged between the first pump body and the second pump body and comprises a rotor and a stator, and the rotor is arranged on the inner side of the stator and is respectively connected with the first crankshaft and the second crankshaft;

the middle cylinder body is arranged in the cavity and sleeved outside the stator;

the first bearing is installed at one end of the centering cylinder body in the axial direction in a positioning mode, and the second bearing is installed at the other end of the centering cylinder body in the axial direction in a positioning mode.

According to the utility model discloses compressor of first aspect embodiment has following beneficial effect at least:

when the compressor is installed, through be provided with the cylinder body in the casing subassembly to well, install first bearing location in the cylinder body along axial one end to well, install second bearing location in the cylinder body along axial other end to well, make first bent axle and second bent axle can use the cylinder body to realize the centering installation as the benchmark when the assembly, the centering installation accuracy of first bent axle and second bent axle has been improved, make the axiality precision of first bent axle and second bent axle higher, thereby be favorable to reducing the vibration of compressor, improve the stationarity and the reliability of compressor operation.

According to some embodiments of the present invention, one end of the centering barrel body along the axial direction is provided with a first positioning portion and a first connecting portion, the other end is provided with a second positioning portion and a second connecting portion, the first bearing is provided with a first matching positioning portion and a first matching connecting portion, the second bearing is provided with a second matching positioning portion and a second matching connecting portion, the first bearing is positioned on the centering barrel body through the matching of the first positioning portion and the first matching positioning portion, and is penetrated to the first connecting portion and the first matching connecting portion through a first connecting member to be fixed; the second bearing is positioned on the centering cylinder body through the matching of the second positioning part and the second matching positioning part, and is penetrated and connected to the second connecting part and the second matching connecting part through a second connecting part so as to be fixed.

According to the utility model discloses a some embodiments, first locating part includes a plurality of first locating holes, and is a plurality of first locating hole is followed the circumference interval distribution to well barrel.

The utility model discloses a according to the utility model discloses a some embodiments, second location portion includes a plurality of second locating holes, and is a plurality of the second locating hole is followed to the circumference interval distribution of well barrel.

According to the utility model discloses a some embodiments, first locating hole with the quantity and the size homogeneous phase of second locating hole are the same, and corresponding first locating hole with the coaxial setting of second locating hole.

According to some embodiments of the utility model, first connecting portion include a plurality of first connecting holes, and is a plurality of first connecting hole is followed the circumference interval distribution to well barrel.

According to the utility model discloses a some embodiments, the second connecting portion include a plurality of second connecting holes, and is a plurality of the second connecting hole is followed the circumference interval distribution to well barrel.

According to some embodiments of the utility model, the quantity and the size homogeneous phase of first connecting hole with the second connecting hole are the same, and corresponding first connecting hole with the coaxial setting of second connecting hole.

According to some embodiments of the utility model, the both ends of the well barrel are provided with first flange and second flange respectively, first flange with the second flange is all followed the radial extension of well barrel, first location portion with first connecting portion set up in first flange, second location portion with the second connecting portion set up in the second flange.

According to some embodiments of the invention, the housing assembly comprises a main housing, the first flange and the second flange are welded and fixed to an inner wall of the main housing.

According to some embodiments of the utility model, first flange is provided with a plurality ofly, and is adjacent be formed with first concave position between the first flange, the inner wall of first concave position with the inner wall of the main casing body encloses to be provided with the passageway that supplies the lubricating oil circulation.

Additional aspects and advantages of the present invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

Additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic cross-sectional view of a compressor according to some embodiments of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

fig. 3 is a schematic top view of a centering cylinder according to some embodiments of the present invention;

FIG. 4 is a sectional view taken along line B-B of FIG. 3;

fig. 5 is a schematic top view of a first bearing according to some embodiments of the present invention;

FIG. 6 is a cross-sectional view taken at C-C of FIG. 5;

fig. 7 is a schematic top view of a second bearing according to some embodiments of the present invention;

fig. 8 is a cross-sectional view taken along line D-D of fig. 5.

The reference numbers are as follows:

a housing assembly 100; a main housing 110;

a first pump body 200; a first bearing 210; a first fitting positioning hole 211; a first mating connection hole 212; a first mating flange 213; a first crankshaft 220; the first cylinder 230; the first piston 240; a first connecting member 250;

a second pump body 300; a second bearing 310; a second fitting positioning hole 311; a second mating connection aperture 312; a second mating flange 313; a second crankshaft 320; a second cylinder 330; a second piston 340; a second connector 350;

a motor assembly 400; a stator 410; a rotor 420;

centering the cylinder 500; a first flange 510; a first positioning hole 511; a first connection hole 512; a first recess 513; a second flange 520; and a second connection hole 522.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, if there are first and second descriptions for distinguishing technical features, they are not interpreted as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the precedence of the indicated technical features.

In the description of the present invention, unless there is an explicit limitation, the terms such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the terms in the present invention by combining the specific contents of the technical solution.

In the related art, the rotary compressor widely adopts a single-pump body structure, under the single-pump body structure, a single motor drags a single crankshaft of a single pump body to compress refrigerant for refrigeration, the main way of improving the discharge capacity of the rotary compressor is to increase the number of cylinders and the structural size of the cylinders, the former is limited by the assembly precision of the crankshaft, and the latter is limited by the cost and the weight. If increase the pump body quantity, then can be under the condition that does not change compressor main casing main casing body principal dimension, increase the discharge capacity of compressor by one time, its realization mode is to install two pump bodies respectively in the both sides of a motor, drags the bent axle of two pump bodies simultaneously with a motor and compresses the refrigerant. However, because one crankshaft is added to the compressor, the coaxiality of the two crankshafts is difficult to guarantee, and the reliability and the stability of the operation of the compressor are reduced, so that how to realize the centering installation of the two crankshafts in the assembly process of the double-pump compressor becomes a technical problem which needs to be solved urgently at present.

Therefore, the utility model provides a compressor, this compressor can realize the centering installation of two bent axles in the assembling process to improve the axiality of two bent axles, improve the stationarity and the reliability of compressor operation.

Referring to fig. 1, a first aspect of the present invention provides a compressor, which is a dual-pump rotary compressor, and may be a vertical or horizontal structure. The compressor includes a housing assembly 100, a motor assembly 400, a first pump body 200, a second pump body 300, and a centering cylinder 500. The interior of the housing assembly 100 is hollow to form a cavity, the first pump body 200, the second pump body 300, the motor assembly 400 and the centering cylinder 500 are all arranged in the cavity, the first pump body 200 and the second pump body 300 are opposite to two ends of the motor assembly 400, and the centering cylinder 500 is sleeved outside the motor assembly 400.

Specifically, the first pump body 200 includes a first bearing 210 and a first crankshaft 220, and the first bearing 210 is sleeved on an outer side of the first crankshaft 220. Of course, the first pump body 200 further includes at least one first cylinder 230, the first bearing 210 is a main bearing and is installed on one side of the first cylinder 230 facing the motor assembly 400, the first crankshaft 220 is provided with a first eccentric portion, the outer side of the first eccentric portion is sleeved with the first piston 240, and the first eccentric portion is located in the first cylinder 230 and is used for driving the first piston 240 to compress the refrigerant in the first cylinder 230. In some embodiments, the first pump body 200 includes two first cylinders 230, and the first bearing 210 is mounted at the end of the first cylinder 230 closest to the motor assembly 400.

The second pump body 300 includes a second bearing 310 and a second crankshaft 320, and the second bearing 310 is sleeved on the outer side of the second crankshaft 320. Of course, the second pump body 300 further includes at least one second cylinder 330, the second bearing 310 is a main bearing and is installed on one side of the second cylinder 330 facing the motor assembly 400, the second crankshaft 320 is provided with a second eccentric portion, the outer side of the second eccentric portion is sleeved with the second piston 340, and the second eccentric portion is located in the second cylinder 330 and used for driving the second piston 340 to compress the refrigerant in the second cylinder 330. In some embodiments, the second pump body 300 includes two second cylinders 330, and the second bearing 310 is mounted at an end of the second cylinder 330 closest to the motor assembly 400.

The motor assembly 400 is disposed between the first pump body 200 and the second pump body 300, and includes a rotor 420 and a stator 410, the rotor 420 is mounted inside the stator 410 and can rotate relative to the stator 410, and the first crankshaft 220 and the second crankshaft 320 are respectively connected to two ends of the rotor 420 along an axial direction. Therefore, when the motor assembly 400 is operated, the rotor 420 can drive the first crankshaft 220 and the second crankshaft 320 to rotate simultaneously.

Referring to fig. 3 and 4, the middle cylinder 500 is substantially cylindrical, but may be a cylinder of other shape and fitted and fixed to the outside of the stator 410. The first bearing 210 is positioned to be installed at one end of the centering cylinder 500 in the axial direction, and the second bearing 310 is positioned to be installed at the other end of the centering cylinder 500 in the axial direction. Therefore, the first crankshaft 220 and the second crankshaft 320 can be installed in a centering manner by taking the centering cylinder 500 as a reference during assembly, so that the centering installation precision of the first crankshaft 220 and the second crankshaft 320 is improved, the coaxiality precision of the first crankshaft 220 and the second crankshaft 320 is higher, the vibration of the compressor is reduced, and the running stability and reliability of the compressor are improved.

Specifically, referring to fig. 3 and 4, one end of the middle cylinder 500 in the axial direction is provided with a first positioning portion and a first connecting portion, and the other end is provided with a second positioning portion and a second connecting portion.

Referring to fig. 5 and 6, the first bearing 210 is provided with a first coupling positioning portion coupled with the first positioning portion and a first coupling connecting portion coupled with the first connecting portion, and referring to fig. 7 and 8, the second bearing 310 is provided with a second coupling positioning portion coupled with the second positioning portion and a second coupling connecting portion coupled with the second connecting portion. Both the first positioning part and the first matching positioning part can be through holes, and the first bearing 210 can be positioned at the end part of the centering cylinder 500 by penetrating and connecting the first positioning piece to the through holes; or one of the first positioning portion and the first matching positioning portion is a positioning hole, and the other is a positioning block, and the positioning block extends into the positioning hole so as to position the first bearing 210 at the end of the middle cylinder 500. The second positioning portion and the second matching positioning portion may have a similar structure to the first positioning portion and the second matching positioning portion. Referring to fig. 2, both the first connection portion and the first mating connection portion may be a counterbore or a through hole or a bayonet, and the first bearing 210 may be fixed to the end of the centering cylinder 500 by the first connection member 250 penetrating into the counterbore or the through hole or the bayonet. The second connecting portion and the second mating connecting portion may have a structure similar to that of the first connecting portion and the second mating connecting portion.

When the compressor is installed, the first bearing 210 is positioned in the centering cylinder 500 by the cooperation of the first positioning portion and the first matching positioning portion, then the first bearing 210 is fixedly connected to the centering cylinder 500 by the first connecting member 250 penetrating to the first connecting portion and the first matching connecting portion, the second bearing 310 is positioned in the centering cylinder 500 by the cooperation of the second positioning portion and the second matching positioning portion, and then the second bearing 310 is fixedly connected to the centering cylinder 500 by the second connecting member 350 penetrating to the second connecting portion and the second matching connecting portion, so that the first crankshaft 220 and the second crankshaft 320 can be centered and installed by using the centering cylinder 500 as a reference during assembly, the centering installation accuracy of the first crankshaft 220 and the second crankshaft 320 is improved, the coaxiality accuracy of the first crankshaft 220 and the second crankshaft 320 is higher, the vibration of the compressor is reduced, and the running stability and reliability of the compressor are improved.

Specifically, the utility model discloses a design is to the terminal surface depth of parallelism at well barrel 500 edge axial both ends to can control the centering installation accuracy of first bent axle 220 and second bent axle 320. For example, the parallelism a of the end surfaces of the centering cylinder 500 at both ends in the axial direction is designed to be 0.01mm or less, and the coaxiality b of the first crank shaft 220 and the second crank shaft 320 is 0.5 × a × h/d, where h is the height of the centering cylinder 500 in the axial direction and d is the outer diameter of the centering cylinder 500. Therefore, the smaller the parallelism of the end faces of the inner cylinder 500 at both ends in the axial direction, the higher the accuracy of the coaxiality of the first crankshaft 220 and the second crankshaft 320.

Referring to fig. 3 and 4, it can be appreciated that in some embodiments of the present invention, the first positioning portion includes a plurality of first positioning holes 511, and the plurality of first positioning holes 511 are spaced apart along a circumferential direction of the centering cylinder 500. Referring to fig. 5 and 6, correspondingly, the first matching positioning portion includes a plurality of first matching positioning holes 211, and the first matching positioning holes 211 and the first positioning holes 511 are arranged in a one-to-one correspondence manner. The first positioning element penetrates through the first positioning hole 511 and the first matching positioning hole 211, so that the first bearing 210 is positioned at the end of the centering cylinder 500, and the first positioning element can be a positioning pin or other structural elements. First locating hole 511 can be the hole of round hole or square hole or other shapes, through being provided with a plurality of first locating holes 511 to with a plurality of first locating holes 511 along circumference interval distribution, thereby make first bearing 210 can be located the tip to well barrel 500 more firmly at the in-process of installation, thereby can reduce the first pump body 200 and rock to well barrel 500 relatively, be favorable to further improving the precision of the centering installation of first bent axle 220.

Similarly, the second positioning portion includes a plurality of second positioning holes, and the plurality of second positioning holes are distributed at intervals along the circumferential direction of the centering cylinder 500. Correspondingly, referring to fig. 7 and 8, the second matching positioning portion includes a plurality of second matching positioning holes 311, and the second matching positioning holes 311 and the second positioning holes are arranged in a one-to-one correspondence. The second positioning element is inserted into the second positioning hole and the second matching positioning hole 311, so as to position the second bearing 310 at the end of the middle cylinder 500. The second locating hole can be round hole or square hole or the hole of other shapes, through being provided with a plurality of second locating holes to with a plurality of second locating holes along circumference interval distribution, thereby make second bearing 310 can be positioned the tip to well barrel 500 more firmly at the in-process of installation, thereby can reduce the second pump body 300 and rock to well barrel 500 relatively, be favorable to further improving the precision of the centering installation of second bent axle 320.

It is understood that, referring to fig. 3, in some embodiments of the present invention, two first positioning holes 511 are provided, and the included angle between the two first positioning holes 511 is 180 °, i.e. the two first positioning holes 511 are arranged opposite to each other at 180 °. Therefore, the two first positioning holes 511 can be symmetrically distributed at the end of the centering cylinder 500, so that the stress distribution of the first bearing 210 and the centering cylinder 500 is more uniform during positioning, and the positioning stability is improved. Meanwhile, the number of the first positioning holes 511 is two, so that the positioning of the first bearing 210 is relatively stable on one hand, and the positioning speed is relatively high on the other hand.

Similarly, two second positioning holes are arranged and are oppositely distributed at 180 degrees. Therefore, the two second positioning holes are symmetrically distributed at the end part of the centering cylinder 500, so that the stress distribution of the second bearing 310 and the centering cylinder 500 is more uniform during positioning, and the positioning stability is improved. Meanwhile, the number of the second positioning holes is two, so that the positioning of the second bearing 310 is relatively stable on one hand, and the positioning speed is relatively high on the other hand.

It should be noted that, referring to fig. 3 and 4, in some embodiments of the present invention, the quantity and size of the first positioning hole 511 and the second positioning hole are the same, and the corresponding first positioning hole 511 and the second positioning hole are coaxially disposed, so that the processing of the middle cylinder 500 is more convenient, and the structure of the first positioning part and the second positioning part is also the same, thereby reducing the number of the model and specification of the component and improving the convenience of installation. Accordingly, the number and size of the first and second engagement positioning holes 211 and 311 are the same, so that the first and

second bearings

210 and 310 can be conveniently machined.

It will be appreciated that, with reference to fig. 3, in some embodiments of the present invention, the first connection portion includes a plurality of first connection holes 512, the plurality of first connection holes 512 are spaced apart along the circumference of the centering cylinder 500, correspondingly, with reference to fig. 5, the first mating connection portion includes a plurality of first mating connection holes 212, and the first mating connection holes 212 are disposed in one-to-one correspondence with the first connection holes 512. Referring to fig. 2, the first bearing 210 is fixed to the end of the centering cylinder 500 by the first connection member 250 penetrating the first connection hole 512 and the first coupling connection hole 212, and the first connection member 250 may be a bolt or the like. Through being provided with a plurality of first connecting holes 512 for the tie point of first bearing 210 and centering barrel 500 is more, and the tie point is along circumference interval distribution moreover, thereby makes the first bearing 210 and the distribution of being connected atress of centering barrel 500 more even, is favorable to improving the stability of being connected of first bearing 210 and centering barrel 500.

Similarly, referring to fig. 4, in some embodiments of the present invention, the second connecting portion includes a plurality of second connecting holes 522, the plurality of second connecting holes 522 are distributed along the circumferential direction of the centering cylinder 500 at intervals, correspondingly, the second matching connecting portion includes a plurality of second matching connecting holes 312, and the second matching connecting holes 312 and the second connecting holes 522 are arranged in a one-to-one correspondence. Through being provided with a plurality of second connecting holes 522 for the second bearing 310 is more with the tie point of centering barrel 500, and the tie point is along circumference interval distribution moreover, thereby makes the second bearing 310 more even with the distribution of being connected atress of centering barrel 500, is favorable to improving the connection steadiness of second bearing 310 with centering barrel 500.

It should be noted that, referring to fig. 3 and 4, in some embodiments of the present invention, the number and size of the first connection holes 512 and the second connection holes 522 are the same, and the corresponding first connection holes 512 and the second connection holes 522 are coaxially disposed, so that the middle cylinder 500 is more conveniently processed, and the first connection members 250 and the second connection members 350 have the same structure, thereby reducing the number of model specifications of the components and facilitating the improvement of the convenience of installation. Of course, at this time, the first connecting member 250 and the second connecting member 350 may be the same connecting member, that is, one connecting member simultaneously passes through the coaxial first connecting hole 512, the first mating connecting hole 212, the second connecting hole 522 and the second mating connecting hole 312, so that the number of connecting members can be further reduced, and the convenience of installation is improved. Accordingly, the number and size of the first and second coupling holes 212 and 312 are the same, so that the first and

second bearings

210 and 310 can be conveniently machined.

It will be appreciated that, with reference to fig. 3, in some embodiments of the present invention, the end of the centering cylinder 500 is provided with a first flange 510 extending in the radial direction, and the first positioning portion and the first connecting portion are both provided on the first flange 510. The middle cylinder 500 is provided with the first flange 510 extending in the radial direction at the end portion, so that the end portion of the middle cylinder 500 has more area in the radial direction, and thus the first positioning portion and the first connection portion can be provided on the first flange 510, so that the first positioning portion and the first connection portion are more conveniently provided, and the first flange 510 can improve the structural strength of the end portion of the middle cylinder 500, so that the middle cylinder 500 and the first bearing 210 are more reliably connected. Similarly, the first bearing 210 may also be provided with a first mating flange 213 corresponding to the first flange 510, and the first mating positioning portion and the first mating connection portion are provided on the first mating flange 213.

It is understood that in some embodiments of the present invention, the first connection portion includes a plurality of first connection holes 512, so that the first flange 510 is correspondingly provided with a plurality of first connection holes 512, the plurality of first flanges 510 are spaced apart from each other along the circumferential direction of the centering cylinder 500, and one first connection hole 512 is formed on each first flange 510, so that each first connection hole 512 can be spaced apart from each other along the circumferential direction of the centering cylinder 500. Of course, the plurality of first flanges 510 may be uniformly distributed, so that the force applied to the middle cylinder 500 is more uniform when the middle cylinder is coupled to the first bearing 210. When the number of the first positioning portions is less than the number of the first connecting portions, at this time, the first positioning portions and the first connecting portions are simultaneously disposed on a part of the first flange 510, and only the first connecting portions are disposed on the other part of the first flange 510.

Similarly, referring to fig. 4, the other end of the centering cylinder 500 is provided with a second flange 520 extending in the radial direction, and the second positioning portion and the second connecting portion are both provided in the second flange 520. The middle cylinder 500 is provided with the second flange 520 extending in the radial direction at the end portion, so that the end portion of the middle cylinder 500 has more area in the radial direction, and the second positioning portion and the second connecting portion can be arranged on the second flange 520, so that the arrangement of the second positioning portion and the second connecting portion is more convenient, and the second flange 520 can improve the structural strength of the end portion of the middle cylinder 500, so that the connection of the middle cylinder 500 and the second bearing 310 is more reliable. In some embodiments of the present invention, the second connecting portion includes a plurality of second connecting holes 522, so that the second flange 520 is correspondingly provided with a plurality of second connecting holes 522, and the plurality of second connecting holes 520 are circumferentially spaced from the centering cylinder 500, and each second connecting hole 522 is provided on each second flange 520, so that each second connecting hole 522 can be circumferentially spaced from the centering cylinder 500. Of course, the plurality of second flanges 520 may be uniformly distributed, so that the middle cylinder 500 is more uniformly stressed when being connected with the second bearing 310. When the number of the second positioning portions is less than that of the second connecting portions, at this time, the second positioning portions and the second connecting portions are simultaneously disposed on a part of the second flange 520, and only the second connecting portions are disposed on the other part of the second flange 520. Similarly, the second bearing 310 may also be provided with a second mating flange 313 corresponding to the second flange 520, and the second mating positioning portion and the second mating connecting portion are provided on the second mating flange 313.

It is understood that, referring to fig. 1, in some embodiments of the present invention, the housing assembly 100 includes a main housing 110, an upper housing and a lower housing, the upper housing and the lower housing are respectively connected to both ends of the main housing 110 in an axial direction, and the first flange 510 and the second flange 520 of the centering cylinder 500 are fixedly connected to an inner wall of the main housing 110 by welding or the like. At this time, the first pump body 200 and the second pump body 300 are not directly fixedly connected to the main housing 110, but are connected to the main housing 110 through the middle cylinder 500, so that the first pump body 200 and the second pump body 300 can be prevented from being directly welded to the main housing 110, adverse effects of welding deformation on centering of the first crankshaft 220 and the second crankshaft 320 can be reduced, deformation of cylinder vane grooves of the first pump body 200 and the second pump body 300 can also be reduced, and friction loss of the vane can be reduced.

It will be appreciated that, with reference to fig. 3, in some embodiments of the present invention, the main housing 110 is generally cylindrical, and therefore the outer walls of the first flange 510 and the second flange 520 may also be arc-shaped, and the outer diameters of the first flange 510 and the second flange 520 are the same, so that the first flange 510 and the second flange 520 can be more closely fitted to the inner wall of the main housing 110, thereby making the connection more compact and reliable.

Referring to fig. 3, when a plurality of first flanges 510 are provided at the end of the middle cylinder 500, a first recess 513 is formed between the adjacent first flanges 510, and a passage through which the lubricating oil can flow is formed between the inner wall of the first recess 513 and the inner wall of the main housing 110. Similarly, when a plurality of second flanges 520 are provided to the end of the centering cylinder 500, a second recess is formed between the adjacent second flanges 520, and a passage through which the lubricating oil can flow is formed between the inner wall of the second recess and the inner wall of the main housing 110.

The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims

1. A compressor, characterized by comprising:

a housing assembly having a cavity;

the first bearing is positioned and installed at one end of the centering cylinder body along the axial direction, and the second bearing is positioned and installed at the other end of the centering cylinder body along the axial direction.

2. The compressor according to claim 1, wherein one end of the centering barrel in the axial direction is provided with a first positioning portion and a first connecting portion, and the other end is provided with a second positioning portion and a second connecting portion, the first bearing is provided with a first fitting positioning portion and a first fitting connecting portion, the second bearing is provided with a second fitting positioning portion and a second fitting connecting portion, the first bearing is positioned on the centering barrel by fitting of the first positioning portion and the first fitting positioning portion, and is penetrated to the first connecting portion and the first fitting connecting portion by a first connecting member to be fixed; the second bearing is positioned on the centering cylinder body through the matching of the second positioning part and the second matching positioning part, and is connected to the second connecting part and the second matching connecting part in a penetrating manner through a second connecting piece to be fixed.

3. The compressor of claim 2, wherein the first positioning portion includes a plurality of first positioning holes that are spaced apart in a circumferential direction of the centering cylinder.

4. The compressor of claim 3, wherein the second positioning portion includes a plurality of second positioning holes, and the plurality of second positioning holes are distributed at intervals in the circumferential direction of the centering cylinder.

5. The compressor of claim 4, wherein the first positioning holes and the second positioning holes are the same in number and size, and the corresponding first positioning holes and the corresponding second positioning holes are coaxially arranged.

6. The compressor of claim 2, wherein the first connection portion includes a plurality of first connection holes spaced apart in a circumferential direction of the centering cylinder.

7. The compressor of claim 6, wherein the second connecting portion includes a plurality of second connecting holes spaced apart along a circumferential direction of the centering cylinder.

8. The compressor of claim 7, wherein the first connection holes and the second connection holes are equal in number and size, and the corresponding first connection holes and second connection holes are coaxially arranged.

9. The compressor according to any one of claims 2 to 8, wherein both ends of the centering cylinder are provided with a first flange and a second flange, respectively, each of the first flange and the second flange extends in a radial direction of the centering cylinder, the first positioning portion and the first connecting portion are provided to the first flange, and the second positioning portion and the second connecting portion are provided to the second flange.

10. The compressor of claim 9, wherein the housing assembly includes a main housing, the first and second flanges being welded to the main housing.

11. The compressor of claim 10, wherein the first flanges are provided in plurality, a first recess is formed between adjacent first flanges, and a channel for communicating lubricating oil is defined between an inner wall of the first recess and an inner wall of the main housing.