WO2020134422A1

WO2020134422A1 - Motor rotor, compressor, refrigerant circulation system, and cooling device

Info

Publication number: WO2020134422A1
Application number: PCT/CN2019/112758
Authority: WO
Inventors: 刘华; 张治平; 钟瑞兴; 李宏波; 陈玉辉; 叶文腾; 亓静利
Original assignee: 珠海格力电器股份有限公司
Priority date: 2018-12-25
Filing date: 2019-10-23
Publication date: 2020-07-02
Also published as: CN111371221A

Abstract

A motor rotor (21), a compressor, a refrigerant circulation system, and a cooling device. The motor rotor (21) comprises: a hollow portion, which is disposed at an inner part of the motor rotor (21) and which communicates with an end portion of the motor rotor (21) that is used for a compression unit rotation portion connected to the compressor; and a vent hole, which communicates with the hollow portion and a radial outer side of the motor rotor (21). The compressor comprises the aforementioned motor rotor (21). The present motor rotor (21) and the compressor may solve the problem of heat concentration of the motor rotor (21), which is beneficial in ensuring that a motor in the compressor cools fully, and achieves efficient and reliable operation.

Description

Motor rotor, compressor, refrigerant circulation system and refrigeration equipment

Related application

This application is based on the Chinese patent application with the application number of 201811595308.X and the application date of December 25, 2018, the name of the invention is "motor rotor, compressor, refrigerant circulation system and refrigeration equipment", and claims its priority The disclosure content of the Chinese patent application is hereby incorporated into this application as a whole.

Technical field

The present disclosure relates to the technical field of compressors and refrigeration, in particular to a motor rotor, compressor, refrigerant circulation system and refrigeration equipment.

Background technique

Compressors, such as centrifugal compressors and screw compressors, are widely driven by permanent magnet synchronous motors as power. However, the permanent magnet synchronous motor will generate too much heat during use, causing the motor temperature to rise too fast. If the internal temperature of the motor is too high, it will accelerate the aging of the insulation layer of the enameled wire and affect the insulation performance; especially the permanent magnets inside the rotor will cause demagnetization due to long-term working in a high-temperature working environment. Therefore, it is necessary to take corresponding heat dissipation and cooling measures to take away the heat inside the motor and reduce the temperature of the motor.

Regarding the problem of motor cooling, most compressors of the related art use evaporative or liquid-jet cooling methods to cool the motor, mainly after the liquid refrigerant passes through the motor cooling flow path, it absorbs the heat of the stator surface and becomes gaseous, and then from the end of the motor containing cavity It is discharged, and then flows to the other end of the accommodating cavity of the motor through the matching gap between the stator and the rotor, and the surface of the rotor is cooled again. The above cooling method mainly cools the surface of the rotor and the stator. The internal cooling is insufficient, and there is a phenomenon of temperature concentration inside the rotor, which cannot achieve a good cooling effect. If the refrigerant supply is increased to eliminate the local high temperature, the cooling effect is limited, and the cooling capacity is lost, resulting in a decline in compressor performance.

Summary of the invention

The purpose of the present disclosure is to provide a motor rotor, a compressor, a refrigerant circulation system and a refrigeration equipment, aiming to improve the internal cooling effect of the motor rotor.

A first aspect of the present disclosure provides a motor rotor, including:

The hollow portion is provided inside the rotor of the motor, and communicates with an end of the rotor of the motor for connecting to the rotating portion of the compression unit connected to the compressor; and

The vent hole communicates the hollow portion and the radially outer side of the motor rotor.

In some embodiments, the motor rotor includes permanent magnets.

In some embodiments, the motor rotor includes:

A shaft section at the first end, fixedly arranged at the first end of the permanent magnet; and

The second end shaft segment is fixedly arranged at the second end of the permanent magnet.

In some embodiments,

The first end shaft segment includes a first axial hole and a plurality of first perforations connecting the first axial hole and the radially outer side of the motor rotor, and the hollow portion includes the first axial Hole, the vent hole includes the first perforation; and/or,

The second end shaft section includes a second axial hole and a plurality of second perforations connecting the second axial hole and the radial outer side of the motor rotor, and the hollow portion includes the second axial Hole, the vent hole includes the second perforation.

In some embodiments, both the first axial hole and the second axial hole are axial through holes.

In some embodiments, one of the first axial hole and the second axial hole is an axial through hole, and the other is a blind hole with an open end facing the permanent magnet, the permanent magnet has communication A third axial hole of the first axial hole and the second axial hole.

In some embodiments,

The end of the rotor of the motor is provided with an axial notch for cooperating with the rotating part of the compression unit, and a side wall of the axial notch is provided with a first leakage which is recessed radially outward and communicates with the hollow part Slot; and/or

The end surface of the motor rotor is provided with a second leakage groove communicating with the hollow portion.

A second aspect of the present disclosure provides a compressor including the motor rotor of the first aspect of the present disclosure.

In some embodiments, the compressor includes a housing, a compressor rotor, and a motor stator. The housing has a motor housing cavity and a compression cavity. The motor stator is fixedly disposed in the motor housing cavity and has a rotor installation. Hole, the compressor rotor is rotatably provided in the housing, the compressor rotor includes:

The motor rotor is located in the motor accommodating cavity and penetrates the rotor mounting hole, and the vent hole communicates with the motor accommodating cavity; and

The rotating part of the compression unit is located in the compression cavity and is fixedly connected to the end of the rotor of the motor and forms an air intake path communicating with the hollow part with the rotor of the motor. The fluid in the compression cavity passes through the The air intake passage enters the hollow portion and enters the motor accommodating cavity through the vent hole.

In some embodiments,

The end of the rotor of the motor is provided with an axial notch for cooperating with the rotating part of the compression unit. A side wall of the axial notch is provided with a first leakage groove recessed radially outward. The gas passage includes the first leak groove; and/or

An end face of the rotation part of the compression unit cooperates with an end face of the motor rotor, a second leakage groove is provided on the end face of the motor rotor, and the intake passage includes the second leakage groove; and/or

The end face of the rotation part of the compression unit cooperates with the end face of the rotor of the motor, the end face of the rotation part of the compression unit is provided with a third leakage groove, and the intake passage includes the third leakage groove.

In some embodiments, the motor stator has a return flow hole provided in the axial direction, and the fluid part in the motor receiving cavity flows from one end of the motor stator through the return flow hole to the other side of the motor stator One end partly flows from one end of the motor stator to the other end of the motor stator through the matching gap between the rotor mounting hole and the motor rotor.

In some embodiments, the return flow hole includes:

A gas return hole, located above the rotor of the compressor, for circulating gas; and/or,

The liquid return hole is located under the compressor rotor and is used to circulate liquid.

In some embodiments, the housing is provided with:

Cooling fluid inlet;

A spiral groove is provided on the inner wall of the housing, and forms a spiral cooling flow channel with the outer circumferential surface of the motor stator, the first end of the spiral cooling flow channel communicates with the cooling fluid inlet, and the spiral cooling flow The second end of the channel communicates with the motor housing cavity at one end of the motor stator; and

The cooling fluid outlet communicates with the motor housing cavity at the other end of the motor stator.

In some embodiments, the compressor includes a gas bearing through which the compressor rotor is rotatably supported in the housing.

In some embodiments, the compressor is a centrifugal compressor, and the rotation part of the compression unit is an impeller.

A third aspect of the present disclosure provides a refrigerant circulation system including the compressor described in the second aspect of the present disclosure.

A fourth aspect of the present disclosure provides a refrigeration device including the compressor described in the second aspect of the present disclosure.

Based on the motor rotor and the compressor provided with the rotor provided by the present disclosure, since the hollow portion and the vent holes communicating with the hollow portion and the radial outer side of the motor rotor are provided in the motor rotor, the hollow portion and the motor rotor are used for connection and compression The end of the rotating part of the compressor's compression unit is in communication. In a compressor having the rotor of the motor, an intake passage communicating with the hollow portion may be formed between the rotating section of the compression unit and the motor rotor, and the compression unit may be rotated through the intake passage The fluid in the part enters the hollow part, and as the rotor of the motor rotates, the fluid can flow out of the vent hole to the accommodating cavity of the motor, so that the inside of the motor rotor can be cooled, which can solve the problem of concentrated heating of the motor rotor and help ensure that the compressor has sufficient cooling of the motor , To achieve efficient and reliable operation.

The refrigerant circulation system and refrigeration equipment provided by the present disclosure have the same advantages as the compressor provided by the present disclosure.

Other features and advantages of the present disclosure will become clear through the following detailed description of exemplary embodiments of the present disclosure with reference to the drawings.

BRIEF DESCRIPTION

The drawings described herein are used to provide a further understanding of the present disclosure and form a part of the present application. The exemplary embodiments and descriptions of the present disclosure are used to explain the present disclosure and do not constitute an undue limitation on the present disclosure. In the drawings:

FIG. 1 is a schematic sectional view of a compressor according to an embodiment of the present disclosure.

2 is a schematic cross-sectional structural view of a motor rotor of a compressor according to an embodiment of the present disclosure.

3 is a schematic cross-sectional structural view of a motor rotor of a compressor according to an embodiment of the present disclosure.

4 is a schematic diagram of an end surface structure of a motor rotor of a compressor according to an embodiment of the present disclosure.

5 is a schematic cross-sectional structure diagram of a motor stator of a compressor according to an embodiment of the present disclosure.

6 is a schematic diagram of the flow of a cooling fluid inside a compressor according to an embodiment of the present disclosure.

7 is a schematic diagram of an end surface structure of a motor rotor of a compressor according to an embodiment of the present disclosure.

FIG. 8 is a schematic view of an end surface structure of a motor rotor of a compressor according to an embodiment of the present disclosure.

detailed description

The technical solutions in the embodiments of the present disclosure will be described clearly and completely in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, but not all the embodiments. The following description of at least one exemplary embodiment is actually merely illustrative, and in no way serves as any limitation to the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present disclosure.

Unless specifically stated otherwise, the relative arrangement of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure. At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn according to the actual proportional relationship. Techniques, methods and equipment known to those of ordinary skill in the related art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorized specification. In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiment may have different values. It should be noted that similar reference numerals and letters indicate similar items in the following drawings, therefore, once an item is defined in one drawing, there is no need to discuss it further in subsequent drawings.

In the description of this disclosure, it should be understood that the use of "first", "second" and other words to define parts is only for the purpose of distinguishing the corresponding parts. Unless otherwise stated, the above words are not special Meaning, and therefore cannot be understood as a limitation to the protection scope of the present disclosure.

In the description of the present disclosure, it should be understood that the orientation words such as “front, back, up, down, left, right”, “horizontal, vertical, vertical, horizontal” and “top and bottom” indicate the orientation Or the positional relationship is only for the convenience of describing the present disclosure and simplifying the description. Unless otherwise stated, these directional terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation Therefore, it should not be construed as limiting the scope of protection of the present disclosure; the directional words "inner and outer" refer to the inner and outer relative to the contour of each component itself.

As shown in FIGS. 1 to 6, an embodiment of the present disclosure provides a motor rotor 21. The motor rotor 21 includes a hollow portion and a vent hole. The hollow portion is provided inside the motor rotor 21 and communicates with the end of the motor rotor 21 for connecting to the rotating portion of the compression unit connected to the compressor. The vent hole connects the hollow portion and the radially outer side of the motor rotor.

The embodiment of the present disclosure also provides a compressor including the motor rotor 21. The compressor includes a housing 10, a compressor rotor 20, and a motor stator 30. The compressor rotor 20 includes the aforementioned motor rotor 21.

As shown in FIG. 1, the housing 10 has a motor accommodating cavity 14 and a compression cavity. The motor stator 30 is fixedly disposed in the motor accommodating cavity 14 and has a rotor mounting hole 31.

As shown in FIG. 1, the compressor rotor 20 is rotatably provided in the housing 10 and includes a motor rotor 21 and a compression unit rotating part.

The motor rotor and the compressor having the rotor of the embodiment of the present disclosure are provided with a hollow portion and a vent hole communicating with the hollow portion and the radial outer side of the motor rotor in the motor rotor. The hollow portion and the motor rotor are used for connection and compression The end of the rotating part of the compressor's compression unit is in communication. In a compressor having the rotor of the motor, an intake passage communicating with the hollow portion may be formed between the rotating section of the compression unit and the motor rotor, and the compression unit may be rotated through the intake passage The fluid in the part enters the hollow part, and as the rotor of the motor rotates, the fluid can flow out of the vent hole to the accommodating cavity of the motor, so that the inside of the motor rotor can be cooled, which can solve the problem of concentrated heating of the motor rotor and help ensure that the compressor has sufficient cooling of the motor , To achieve efficient and reliable operation.

As shown in FIGS. 1 to 3 and 6, the motor rotor 21 is located in the motor accommodating cavity 14 and penetrates the rotor mounting hole 31. The motor rotor 21 has a hollow portion and a vent hole (a vent hole is not shown in FIG. 1 ), and the vent hole communicates with the hollow portion and the motor accommodating cavity 14.

The rotating part of the compression unit is located in the compression cavity, and is fixedly connected to the end of the motor rotor 21 and forms an intake path communicating with the hollow portion between the motor rotor 21. The fluid in the compression cavity enters the hollow portion through the intake path and passes through The air hole enters the motor accommodating chamber 14.

As shown in FIG. 1, in some embodiments, the housing 10 includes a motor barrel 11 and first volutes 12 and a first volute respectively disposed at two axial ends (left and right ends in FIG. 1) of the motor barrel 11. Two volutes 13.

As shown in FIG. 1, in some embodiments, the compressor may be a centrifugal compressor, and the rotating part of the compression unit is an impeller of the centrifugal compressor. The compression unit rotating parts may be provided on only one side of the motor rotor, or the compression unit rotating parts may be provided on both sides of the motor rotor, respectively. The rotating part of the compression unit on each side may be single-stage or multi-stage. For example, when the rotation part of the compression unit is an impeller, the number of impellers on the rotor side of the motor may be one, or may be two or more.

As shown in FIG. 1, in some embodiments, the compressor rotor 20 includes a motor rotor 21, a primary impeller 22 and a secondary impeller 23. The compressor rotor 20 further includes a first lock lever 24, a second lock lever 25, a first lock nut 26, and a second lock nut 27. The first-stage impeller 22 is fixed to the left end of the motor rotor 21 through the first lock lever 24 and the first lock nut 26, and the second-stage impeller 23 is fixed to the motor rotor 21 through the second lock lever 25 and the second lock nut 27 Right end. The first locking bar 24 and the second locking bar 25 and the motor rotor 21 may be provided integrally, or may be provided separately and then connected together by a connection method such as a screw connection. Corresponding to the first-stage impeller 22 and the second-stage impeller 23, there are two compression chambers, which are a first-stage compression chamber 15 and a second-stage compression chamber 16, respectively. The first-stage impeller 22 is located in the first-stage compression chamber 15 and the second-stage impeller 23 is located in the second-stage compression chamber 16.

In some embodiments (not shown), the compressor may have other compression unit rotating parts. For example, the compression unit rotating part may be a screw, and it is not excluded as a movable scroll or roller.

As shown in FIG. 1, in some embodiments, the compressor further includes a motor stator 30, a first diffuser 40, a first bearing housing 50, a first radial bearing 60, a second diffuser 70, and a second bearing The seat 80 and the second radial bearing 90 and the unillustrated first thrust bearing and second thrust bearing.

As shown in FIGS. 1 and 6, the motor stator 30 is fixed to the housing 10 and has a rotor mounting hole 31, and the motor rotor 21 passes through the rotor mounting hole 31.

The first bearing housing 50 and the second bearing housing 80 are respectively fixed inside the motor barrel 11 of the housing 10 and located at both ends of the motor stator 30 in the axial direction. The first radial bearing 60 is located in the first bearing housing 50 and the second radial bearing 90 is located in the second bearing housing 80. The first radial bearing 60 and the second radial bearing 90 are respectively supported on both axial ends of the motor rotor 21, so as to support the motor rotor 21 in the motor accommodating cavity 14 in the motor barrel 11 of the housing 10.

The compressor rotor 20 further includes a thrust disk 28 provided at one axial end (left end in FIG. 1) of the motor rotor 21. A first thrust bearing is provided between the first bearing seat 50 and the thrust disk 28, and a second thrust bearing is provided at the end of the first diffuser 40 facing away from the diffuser structure on the diffuser 40, so that the motor rotor 21 The upper limit in the axial direction is located in the motor accommodating cavity 14 of the housing 10.

The first diffuser 40 and the second diffuser 70 respectively have a diffuser structure, such as a blade or a diffuser surface, and integrate a sealing structure, such as a comb tooth, so that the first diffuser 40 and the second diffuser 70 It is also used to isolate the primary compression chamber 15 from the motor accommodation chamber 14 and the secondary compression chamber 16 from the motor accommodation chamber 14 to prevent the fluid in the primary compression chamber 15 and the secondary compression chamber 16 from passing through the compressor rotor 20 and the first The gap between the diffuser 40 and the gap between the compressor rotor 20 and the second diffuser 70 leak into the motor accommodating chamber 14.

As shown in FIGS. 1 to 3 and 6, in some embodiments, the motor rotor includes permanent magnets 211. The permanent magnet 211 can generate a magnetic field, which is used to drive the motor rotor 21 and the compressor rotor 20 to rotate when the winding of the motor stator 30 is energized.

The embodiments of the present disclosure are suitable for motor cooling of various compressors, especially for motor cooling of compressors using permanent magnet synchronous motors, which is beneficial to solve the problem of uniformity of motor cooling and helps to avoid motor rotors caused by long-term operation in high-temperature environments The permanent magnet is demagnetized and the motor is damaged.

As shown in FIGS. 1 to 3 and 6, in some embodiments, the motor rotor 21 includes a permanent magnet 211, a first end shaft segment 212 and a second end shaft segment 213.

The permanent magnet 211 may be a solid cylinder as shown in FIG. 2 or a hollow cylinder with a through hole as shown in FIG. 3. The permanent magnet 211 as the motor rotor 21 and the motor stator 30 together constitute a motor that drives the compressor rotor 20 to rotate. The material of the permanent magnet 211 is, for example, magnetic steel.

The first end shaft section 212 is fixedly disposed at the first end of the permanent magnet 211. The second end shaft section 213 is fixedly disposed at the second end of the permanent magnet 211.

As shown in FIGS. 2 and 3, in some embodiments, the motor rotor 21 further includes a mounting sleeve 214 integrally provided on the end of the first end shaft section 212 near the permanent magnet 211. The permanent magnet 211 and the second end shaft section 213 are fixedly installed in the mounting sleeve 214 by a hot sleeve method.

In some embodiments not shown, an independent mounting sleeve may be provided, and the first end shaft section, the permanent magnet, and the second end shaft section are all sleeved in the mounting sleeve by means of a heat sleeve.

As shown in FIGS. 2 and 3, in some embodiments, the first end shaft segment 212 includes a first axial hole 2121 and a radially outer side (and the motor housing cavity 14) that communicates the first axial hole 2121 with the motor rotor ) Of the plurality of first perforations 2122, the hollow portion includes a first axial hole 2121, and the vent hole includes a first perforation 2122. The second end shaft section 213 includes a second axial hole 2131 and a plurality of second perforations 2132 connecting the second axial hole 2131 to the radially outer side of the motor rotor (and the motor housing cavity 14), and the hollow portion includes the second shaft To the hole 2131, the vent hole includes a second perforation 2132.

As shown in FIGS. 2, 3 and 6, the hollow portions and the vent holes are symmetrically distributed. The hollow portion is an axial hole, and the vent hole is a radial hole. A plurality of vent holes are evenly distributed on the corresponding shaft sections in the axial direction and the circumferential direction, respectively. It is also possible to set the number of vent holes of the shaft sections at both ends to be the same and/or to set the angle to the same. The above various arrangements are beneficial to the dynamic balance of the motor rotor 21.

The plurality of vent holes of the motor rotor 21 may be neatly arranged, or may be staggered or spirally arranged. The cross-sectional shape of the vent hole is not limited, and for example, it may be circular, square, triangular, or the like.

As shown in FIG. 2, in some embodiments, the first axial hole 2121 and the second axial hole 2131 are both axial through holes. In FIG. 2, the permanent magnet 211 is a solid cylinder made of permanent magnets. At this time, air intake passages need to be provided at both ends of the motor rotor, and each air intake passage supplies fluid to the hollow portion of the corresponding end for cooling the motor rotor 21.

For better cooling, one or more holes can be made in the permanent magnet. On the one hand, these holes can allow fluid to enter the interior of the permanent magnet to better cool the motor rotor. On the other hand, the hole in the aforementioned one or some holes that connects the two axial end surfaces of the permanent magnet can also serve to connect the motor rotor. The role of the hollow side. At this time, the air intake passage may be provided at both ends of the motor rotor, or the air intake passage may be provided only at one end of the motor rotor.

As shown in FIG. 3, in some embodiments, one of the first axial hole 2121 and the second axial hole 2131 is an axial through hole, and the other is a blind hole with an open end facing the permanent magnet 211, the permanent magnet 211 There is a third axial hole 2111 communicating the first axial hole 2121 and the second axial hole 2131. Affected by the permanent magnet material, the size of the third axial hole 2111 is preferably less than or equal to 4 mm in diameter.

As shown in FIGS. 1 to 3 and FIG. 6, in some embodiments, the end of the motor rotor 21 is provided with an axial recess for cooperating with the rotating portion of the compression unit, and the side wall of the axial recess is provided with a radial direction The first leak groove 2124 recessed on the outer side, and the intake passage includes the first leak groove 2124. In FIG. 2 or FIG. 3, the left end of the first end shaft segment 211 at the left end of the motor rotor 21 is provided with a first axial recess 2123, and the second end shaft segment 212 at the right end of the motor rotor 21 The right end is provided with a second axial notch 2133.

The first leakage groove 2124 of an embodiment will be described below with reference to FIG. 4 by taking the left end surface of the motor rotor 21 as an example. As shown in FIG. 4, four first leakage grooves 2124 are provided on the side wall of the first axial recess 2123 at the left end of the first end shaft section 211 at the left end of the motor rotor 21. The four first leakage slots 2124 are evenly distributed along the axial direction of the motor rotor 21. The cross-sectional shape of the first leak groove 2124 is V-shaped.

In the embodiment shown in FIG. 2, the first leakage grooves are provided in the axial notches at the left and right ends of the motor rotor 21. In the embodiment shown in FIG. 3, a first leak groove is provided in the axial recess 2133 at the right end of the motor rotor 21.

As shown in FIG. 2, the first axial notch 2123 is provided at the end of the first axial hole 2121, and the second axial notch 2133 is provided at the end of the first axial hole 2131.

As shown in FIG. 3, the first axial notch 2123 and the first axial hole 2121 are located at both ends of the first end shaft segment 212, and are separated by a partition wall 2125 in the middle. The second axial recess 2133 is provided at the end of the first axial hole 2131.

As shown in FIG. 7, in some embodiments, the end surface of the rotating portion of the compression unit cooperates with the end surface of the motor rotor 21. The end surface of the motor rotor 21 is provided with a second leakage groove 2126, and the intake passage includes the second leakage groove 2126.

As shown in FIG. 8, in some embodiments, the end surface of the rotation portion of the compression unit cooperates with the end surface of the motor rotor 21, the end surface of the rotation portion of the compression unit is provided with a third leakage groove 221, and the intake passage includes the third leakage groove 221.

In order to allow the intake passage to introduce the fluid in the compression chamber into the hollow portion of the motor rotor 21, in some embodiments, two or three of the first leakage groove, the third leakage groove, and the second leakage groove may be included at the same time.

The cross-sectional shape of the aforementioned various leak grooves is not limited, in addition to the V-shape, for example, it may be arc-shaped, square-shaped, trapezoidal, U-shaped, and the like. The number of the aforementioned various leakage slots is not limited, for example, it may be less than 4 or greater than 4. The cross-sectional size of the leakage groove is suitable for passing the fluid used for cooling the motor rotor 21.

In the above embodiment, the motor rotor 21 includes a three-segment structure, and the left and right end shaft sections are processed into a hollow structure with an integral permanent magnet in the middle, which is beneficial to simplify the structure and reduce assembly. The motor rotor 21 has a plurality of vent holes, and a plurality of perforations are made in the motor rotor 21 to form a honeycomb-shaped pore. When the motor rotor 21 rotates at a high speed, a fluid such as a refrigerant flows through the hollow portion and the vent hole, the motor can be The heat inside the rotor 21 is taken away.

As shown in FIG. 1, FIG. 5 and FIG. 6, in some embodiments, the motor stator 30 has a return flow hole provided along the axial direction. The fluid in the motor accommodating cavity 14 flows from one end of the motor stator 30 to the other end of the motor stator 30 through the return flow hole, and partly flows from one end of the motor stator 30 to the motor through the matching gap 311 between the rotor mounting hole 31 and the motor rotor 21 The other end of the stator 30.

As shown in FIGS. 1, 5 and 6, the return flow hole includes: a return air hole 32 located above the compressor rotor 20 for circulating gas; and/or a liquid return hole 33 located below the compressor rotor 20 for For circulating liquids. Referring to FIG. 5, in some embodiments, the return flow hole includes three return air holes 32 and three return liquid holes 33.

The provision of the return flow hole can cool the inside of the motor stator 30, and also increase the flow area when the fluid flows back, which is conducive to heat dissipation of the motor.

As shown in FIG. 6, in some embodiments, the housing 10 is further provided with a cooling fluid inlet 111, a spiral groove 112 and a cooling fluid outlet 113. The spiral groove 112 is provided on the inner wall of the motor barrel 11 of the housing 10 and forms a spiral cooling flow path with the outer circumferential surface of the motor stator 30. The first end of the spiral cooling flow path communicates with the cooling fluid inlet 111. The second end communicates with the motor accommodating cavity 14 at one end of the motor stator 30 (the left end shown in FIG. 6). The cooling fluid outlet 113 communicates with the motor accommodating chamber 14 at the other end (the right end shown in FIG. 6) of the motor stator 30. The cooling fluid outlet 113 is provided at the right end of the motor barrel 11.

After the gas in the compression chamber leaks into the hollow portion of the motor rotor 21 through the air intake passage at one or both ends of the motor rotor, the motor rotor 21 is cooled, and then the motor rotor 21 passes through The air holes are thrown out into the motor housing cavity 14 to take away the heat inside the motor rotor 21 and mix with the fluid that enters the left end of the motor housing cavity 14 through the spiral cooling flow path, and then pass through the return flow hole and the rotor mounting hole 31 to the motor rotor 21 The matching gap 311 between them flows to the right end of the accommodating chamber of the motor, and then flows out of the compressor through the cooling fluid outlet 113.

In the compressor of the present disclosure, the rotor may be supported on the housing through various types of bearings, such as sliding bearings, rolling bearings, hydraulic bearings, magnetic suspension bearings, and the like.

In some embodiments, the compressor includes a gas bearing, and the compressor rotor 20 is rotatably supported on the housing 10 through the gas bearing. The gas bearing is, for example, a dynamic pressure gas bearing or a static pressure gas bearing. The gas bearing can use the same gas as the working gas compressed by the compressor as the suspension gas, so that the installation position of the vent hole of the motor rotor does not need to avoid the installation position of the gas bearing.

Since the motor rotor has a hollow portion, it is beneficial to reduce the weight of the motor rotor and is more suitable for gas bearing applications.

As shown in FIG. 1, in some embodiments, the aforementioned first radial bearing 60, second radial bearing 90, first thrust bearing, and second thrust bearing are all dynamic pressure gas bearings.

The working process and principle of the cooling fluid circulation of the motor in the compressors of the above embodiments using the refrigeration compressor used as a refrigerant circulation system as an example will be described below with reference to FIGS. 1 to 6.

The cooling medium as the cooling fluid enters the spiral cooling channel through the cooling fluid inlet 111, the cooling fluid spirally flows between the motor barrel 11 and the motor stator 30, the cooling fluid flowing in the spiral channel continuously absorbs heat, and reduces the surface of the motor stator 30 temperature. The refrigerant as a cooling fluid leaking from both ends of the motor rotor 21 enters the hollow portion of the motor rotor 21, absorbs the heat inside the motor rotor 21, and then is thrown out of the vent hole of the motor rotor 21 under the action of high-speed rotation. 21 internal cooling. After the refrigerant accumulates at the left end of the motor accommodating cavity 14, a part of it flows to the right end of the motor accommodating cavity 14 through the matching gap 311 between the motor stator 30 and the motor rotor 21 to absorb the heat of the outer surface of the motor rotor 21. At the same time, because the motor stator 30 is provided with an air return hole 32 at the upper portion and a liquid return hole 33 at the lower portion, the gas refrigerant at the left end of the motor accommodating chamber 14 will also flow to the right end of the motor accommodating chamber 14 through the air return hole 32, and the liquid refrigerant at the left end of the motor accommodating chamber 14 will It flows to the right end of the motor accommodating chamber 14 through the liquid return hole 33, and takes away the internal heat of the motor stator 30, so that the motor is cooled more fully.

When each radial bearing and each thrust bearing is a gas bearing, since each gas bearing is located in the motor accommodating chamber 14, the refrigerant in the motor accommodating chamber 14 can directly supply gas to the gas bearing and cool the gas bearing. Therefore, the compressor of the above embodiment not only helps solve the problem of internal cooling of the motor rotor 21, but also supplies gas to the gas bearing of the compressor, omits an external gas supply device, and further improves the working stability and reliability of the compressor.

The compressor of the embodiment of the present disclosure can make the motor rotor cool evenly, eliminate the local high temperature phenomenon caused by concentrated heat, and help ensure the safe and reliable operation of the compressor.

Embodiments of the present disclosure also provide a refrigerant circulation system, including the aforementioned compressor. At this time, the working medium of the compressor is the refrigerant in the refrigerant circulation system.

An embodiment of the present disclosure also provides a refrigeration device, including the aforementioned compressor. The compressor may be a centrifugal compressor, a screw compressor, or the like.

The refrigerant circulation system and the refrigeration equipment of the embodiments of the present disclosure have the advantages that the compressor of the embodiments of the present disclosure has.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure but not to limit them; although the present disclosure has been described in detail with reference to the preferred embodiments, persons of ordinary skill in the art should understand that: Modifications or equivalent replacements of some technical features of the disclosed specific embodiments shall be covered by the scope of the technical solutions claimed in the present disclosure.

Claims

A motor rotor, including:

The hollow portion is provided inside the rotor of the motor, and communicates with an end of the rotor of the motor for connecting to the rotating portion of the compression unit connected to the compressor; and

The vent hole communicates the hollow portion and the radially outer side of the motor rotor.
The motor rotor according to claim 1, comprising a permanent magnet (211).
The motor rotor according to claim 2, comprising:

A first end shaft section (212) fixedly arranged at the first end of the permanent magnet (211); and

The second end shaft segment (213) is fixedly arranged at the second end of the permanent magnet (211).
The motor rotor according to claim 3, wherein

The first end shaft section (212) includes a first axial hole (2121) and a plurality of first perforations (2122) connecting the first axial hole (2121) and the radially outer side of the motor rotor , The hollow portion includes the first axial hole (2121), and the vent hole includes the first perforation (2122); and/or,

The second end shaft section (213) includes a second axial hole (2131) and a plurality of second perforations (2132) connecting the second axial hole (2131) and the radially outer side of the motor rotor The hollow portion includes the second axial hole (2131), and the vent hole includes the second perforation (2132).
The motor rotor according to claim 4, wherein the first axial hole (2121) and the second axial hole (2131) are both axial through holes.
The motor rotor according to claim 4, wherein one of the first axial hole (2121) and the second axial hole (2131) is an axial through hole, and the other is an open end facing the A blind hole of a permanent magnet (211), the permanent magnet (211) has a third axial hole (2111) communicating the first axial hole (2121) and the second axial hole (2131).
The motor rotor according to claim 1, wherein

The end of the motor rotor (21) is provided with an axial notch for cooperating with the rotating part of the compression unit, and the side wall of the axial notch is provided with a recessed radially outward and communicating with the hollow part First leak slot (2124); and/or

The end surface of the motor rotor (21) is provided with a second leakage groove (2126) communicating with the hollow portion.
A compressor comprising the motor rotor (21) according to any one of claims 1 to 7.
The compressor according to claim 8, comprising a housing (10), a compressor rotor (20) and a motor stator (30), the housing (10) has a motor housing cavity (14) and a compression cavity, the The motor stator (30) is fixedly arranged in the motor accommodating cavity (14) and has a rotor mounting hole (31), the compressor rotor (20) is rotatably provided in the housing (10), the The compressor rotor (20) includes:

The motor rotor (21) is located in the motor housing cavity (14) and penetrates the rotor mounting hole (31), and the vent hole communicates with the motor housing cavity (14); and

The rotating part of the compression unit is located in the compression cavity and is fixedly connected to the end of the motor rotor (21) and forms an intake passage communicating with the hollow part between the motor rotor (21) and the compression The fluid in the cavity enters the hollow portion through the air intake passage, and enters the motor accommodating cavity (14) through the vent hole.
The compressor according to claim 9, wherein

The end of the motor rotor (21) is provided with an axial notch for cooperating with the rotating part of the compression unit, and a side wall of the axial notch is provided with a first leakage groove recessed radially outward ( 2124), the intake passage includes the first leak groove (2124); and/or

The end surface of the rotation part of the compression unit is matched with the end surface of the motor rotor (21), and a second leakage groove (2126) is provided on the end surface of the motor rotor (21), and the intake passage includes the second leakage Slot (2126); and/or

The end face of the rotation part of the compression unit cooperates with the end face of the rotor (21) of the motor, the end face of the rotation part of the compression unit is provided with a third leakage groove (221), and the intake passage includes the third leakage groove (221).
The compressor according to claim 9, wherein the motor stator (30) has a return flow hole provided in the axial direction, and the fluid portion in the motor accommodating chamber (14) is separated from the motor stator (30) One end of the motor flows to the other end of the motor stator (30) through the return flow hole, partly from one end of the motor stator (30) between the rotor mounting hole (31) and the motor rotor (21) The matching clearance (311) flows to the other end of the motor stator (30).
The compressor according to claim 11, wherein the return flow hole includes:

The air return hole (32) is located above the compressor rotor (20) and is used to circulate gas; and/or,

The liquid return hole (33) is located below the compressor rotor (20) and is used to circulate liquid.
The compressor according to claim 9, wherein the housing (10) is provided with:

Cooling fluid inlet (111);

A spiral groove (112) is provided on the inner wall of the casing (10), and forms a spiral cooling channel with the outer circumferential surface of the motor stator (30), the first end of the spiral cooling channel and the cooling The fluid inlet (111) communicates, and the second end of the spiral cooling channel communicates with the motor accommodating chamber (14) at one end of the motor stator (30); and

The cooling fluid outlet (113) communicates with the motor housing cavity (14) at the other end of the motor stator (30).
The compressor according to any one of claims 8 to 13, wherein the compressor includes a gas bearing, and the compressor rotor (20) is rotatably supported by the housing (10) through the gas bearing )Inside.
The compressor according to any one of claims 8 to 13, wherein the compressor is a centrifugal compressor, and the compression unit rotating portion is an impeller.
A refrigerant circulation system comprising the compressor according to any one of claims 8 to 15.
A refrigeration equipment comprising the compressor according to any one of claims 8 to 15.