Motor Rotor, Compressor, Refrigerant Circulation System and Refrigeration Equipment

Abstract

The present disclosure provides an electric motor rotor, a compressor, a refrigerant circulation system, and a refrigeration device. The electric motor rotor includes: a hollow portion disposed inside the electric motor rotor and communicating with an end portion of the electric motor rotor for rotatingly connecting to a compression unit of a compressor; and a ventilation hole communicating the hollow portion with the radial outside of the electric motor rotor. The compressor includes the aforementioned electric motor rotor. The electric motor rotor and the compressor of the present disclosure can solve the problem of concentrated heat generation of the electric motor rotor, which is conducive to ensuring sufficient cooling of the electric motor in the compressor and achieving efficient and reliable operation.

Description

Technical Field

[0001] The present disclosure relates to the technical fields of compressors and refrigeration, and particularly to an electric motor rotor, a compressor, a refrigerant circulation system, and a refrigeration device. Background Art

[0002] Compressors, such as centrifugal compressors, screw compressors, etc., widely use permanent magnet synchronous motors as power for driving. However, excessive heat is generated during the use of permanent magnet synchronous motors, resulting in too rapid an increase in the motor temperature. If the temperature inside the motor is too high, it will accelerate the aging of the insulating layer of the enameled wire and affect the insulation performance; especially the permanent magnets inside the rotor will cause demagnetization due to working in a high-temperature environment for a long time. Therefore, corresponding heat dissipation and cooling measures need to be taken to remove the heat inside the motor and reduce the motor temperature.

[0003] Regarding the problem of motor cooling, most of the existing compressors use evaporative or liquid injection cooling methods to cool the motor. Mainly, after the liquid refrigerant passes through the motor cooling flow path, it absorbs the heat on the stator surface and becomes gaseous, and then is discharged from one end of the motor accommodation cavity, and then flows through the fitting gap between the stator and the rotor to the other end of the motor accommodation cavity to cool the surface of the rotor again. The above cooling methods mainly cool the surfaces of the rotor and the stator, and the internal cooling is not sufficient. There is a phenomenon of temperature concentration inside the rotor, and a good cooling effect cannot be achieved. If the refrigerant supply is increased to eliminate local high temperature, the cooling effect is limited, and it brings cold loss, resulting in a decline in the performance of the compressor. Summary of the Invention

[0004] The purpose of the present disclosure is to provide an electric motor rotor, a compressor, a refrigerant circulation system, and a refrigeration device, aiming to improve the internal cooling effect of the electric motor rotor.

[0005] The first aspect of the present disclosure provides an electric motor rotor, including:

[0006] A hollow part, disposed inside the electric motor rotor and communicating with the end of the electric motor rotor for rotatingly connecting with the compression unit of the compressor; and

[0007] Vent holes, communicating the hollow part with the radial outside of the electric motor rotor.

[0008] In some embodiments, the electric motor rotor includes permanent magnets.

[0009] In some embodiments, the electric motor rotor includes:

[0010] A first end shaft section, fixedly disposed at the first end of the permanent magnet; and

[0011] A second end shaft section, fixedly disposed at the second end of the permanent magnet.

[0012] In some embodiments,

[0013] The first end shaft segment includes a first axial hole and a plurality of first through holes that communicate the first axial hole with the radial outside of the motor rotor. The hollow portion includes the first axial hole, and the ventilation holes include the first through holes; and / or,

[0014] The second end shaft segment includes a second axial hole and a plurality of second through holes that communicate the second axial hole with the radial outside of the motor rotor. The hollow portion includes the second axial hole, and the ventilation holes include the second through holes.

[0015] In some embodiments, both the first axial hole and the second axial hole are axial through holes.

[0016] 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 a third axial hole that communicates the first axial hole and the second axial hole.

[0017] In some embodiments,

[0018] An axial notch for cooperating with the rotating part of the compression unit is provided at the end of the motor rotor. A first leakage groove that recesses radially outward and communicates with the hollow portion is provided on the side wall of the axial notch; and / or

[0019] A second leakage groove that communicates with the hollow portion is provided on the end face of the motor rotor.

[0020] A second aspect of the present disclosure provides a compressor, including the motor rotor of the first aspect of the present disclosure.

[0021] In some embodiments, the compressor includes a housing, a compressor rotor, and a motor stator. The housing has a motor accommodation cavity and a compression cavity. The motor stator is fixedly arranged in the motor accommodation cavity and has a rotor mounting hole. The compressor rotor is rotatably arranged in the housing. The compressor rotor includes:

[0022] The motor rotor, located in the motor accommodation cavity and passing through the rotor mounting hole, and the ventilation holes communicate with the motor accommodation cavity; and

[0023] A rotating part of the compression unit, located in the compression cavity, fixedly connected to the end of the motor rotor and forming an intake passage communicating with the hollow portion between the rotating part of the compression unit and the motor rotor. The fluid in the compression cavity enters the hollow portion through the intake passage and enters the motor accommodation cavity through the ventilation holes.

[0024] In some embodiments,

[0025] An axial notch for cooperating with a rotating part of the compression unit is provided at an end of the motor rotor, and a first leakage groove recessed radially outward is provided on a side wall of the axial notch. The intake passage includes the first leakage groove; and / or

[0026] An end face of the rotating part of the compression unit cooperates with an end face of the motor rotor. A second leakage groove is provided on this end face of the motor rotor. The intake passage includes the second leakage groove; and / or

[0027] An end face of the rotating part of the compression unit cooperates with an end face of the motor rotor. A third leakage groove is provided on this end face of the rotating part of the compression unit. The intake passage includes the third leakage groove.

[0028] In some embodiments, a return through hole is axially provided inside the motor stator. A part of the fluid in the motor accommodation cavity flows from one end of the motor stator to the other end through the return through hole, and a part flows from one end of the motor stator to the other end through a fitting clearance between the rotor mounting hole and the motor rotor.

[0029] In some embodiments, the return through hole includes:

[0030] A gas return hole, located above the compressor rotor, for gas circulation; and / or,

[0031] A liquid return hole, located below the compressor rotor, for liquid circulation.

[0032] In some embodiments, the housing is provided with:

[0033] A cooling fluid inlet;

[0034] A spiral groove, provided on an inner wall of the housing, forms a spiral cooling flow path with an outer peripheral surface of the motor stator. A first end of the spiral cooling flow path communicates with the cooling fluid inlet, and a second end of the spiral cooling flow path communicates with the motor accommodation cavity at one end of the motor stator; and

[0035] A cooling fluid outlet, communicating with the motor accommodation cavity at the other end of the motor stator.

[0036] In some embodiments, the compressor includes a gas bearing, and the compressor rotor is rotatably supported in the housing by the gas bearing.

[0037] In some embodiments, the compressor is a centrifugal compressor, and the rotating part of the compression unit is an impeller.

[0038] A third aspect of the present disclosure provides a refrigerant circulation system, including the compressor according to any one of the second aspects of the present disclosure.

[0039] The fourth aspect of the present disclosure provides a refrigeration device, including the compressor described in any one of the second aspects of the present disclosure.

[0040] Based on the motor rotor provided by the present disclosure and the compressor having this rotor, due to the hollow part being provided in the motor rotor and the ventilation holes being communicated with both the hollow part and the radially outer side of the motor rotor, and the hollow part being communicated with the end of the motor rotor for connecting the rotating part of the compression unit of the compressor, in the compressor having this motor rotor, an intake passage communicated with the hollow part can be formed between the rotating part of the compression unit and the motor rotor. Through the intake passage, the fluid in the rotating part of the compression unit can enter the hollow part. As the motor rotor rotates, this fluid can flow out from the ventilation holes to the motor accommodation cavity, thereby cooling the inside of the motor rotor, solving the problem of concentrated heat generation of the motor rotor, facilitating ensuring sufficient cooling of the motor in the compressor, and achieving efficient and reliable operation.

[0041] The refrigerant circulation system and the refrigeration device provided by the present disclosure have the same advantages as the compressor provided by the present disclosure.

[0042] Through the following detailed description of the exemplary embodiments of the present disclosure with reference to the accompanying drawings, other features and advantages of the present disclosure will become clear. Description of the Drawings

[0043] The drawings described herein are used to provide a further understanding of the present disclosure, form a part of this application, and the schematic embodiments of the present disclosure and their descriptions are used to explain the present disclosure, and do not constitute an improper limitation to the present disclosure. In the drawings:

[0044] Figure 1 It is a schematic cross-sectional structure diagram of the compressor according to an embodiment of the present disclosure.

[0045] Figure 2 It is a schematic cross-sectional structure diagram of the motor rotor of the compressor according to an embodiment of the present disclosure.

[0046] Figure 3 It is a schematic cross-sectional structure diagram of the motor rotor of the compressor according to an embodiment of the present disclosure.

[0047] Figure 4 It is a schematic end-face structure diagram of the motor rotor of the compressor according to an embodiment of the present disclosure.

[0048] Figure 5 It is a schematic cross-sectional structure diagram of the motor stator of the compressor according to an embodiment of the present disclosure.

[0049] Figure 6 It is a schematic diagram of the flow of the fluid for internal cooling in the compressor according to an embodiment of the present disclosure. Detailed Embodiments

[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present disclosure with reference to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. The description of at least one exemplary embodiment is actually only illustrative and in no way limits the present disclosure and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts belong to the scope of protection of the present disclosure.

[0051] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and 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 the convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0052] In the description of the present disclosure, it should be understood that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Without further statement, the above terms have no special meanings and thus cannot be construed as limiting the scope of protection of the present disclosure.

[0053] In the description of the present disclosure, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are only for the convenience of describing the present disclosure and simplifying the description. Without contrary description, these orientation words 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, and thus cannot be construed as limiting the scope of protection of the present disclosure; the orientation words "inner, outer" refer to the inside and outside relative to the contour of each component itself.

[0054] As Figures 1 to 6 shown, an embodiment of the present disclosure provides a motor rotor 21. The motor rotor 21 includes a hollow portion and a ventilation hole. The hollow portion is disposed inside the motor rotor 21 and communicates with an end of the motor rotor 21 for rotatingly connecting to a compression unit of a compressor. The ventilation hole communicates the hollow portion with the radial outside of the motor rotor.

[0055] An 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.

[0056] As Figure 1 shown, the housing 10 has a motor accommodation cavity 14 and a compression cavity. The motor stator 30 is fixedly arranged in the motor accommodation cavity 14 and has a rotor mounting hole 31.

[0057] As Figure 1 shown, the compressor rotor 20 is rotatably arranged in the housing 10 and includes a motor rotor 21 and a compression unit rotating part.

[0058] For the motor rotor in the embodiment of the present disclosure and the compressor having the rotor, due to the provision of a hollow part and a ventilation hole communicating with both the hollow part and the radially outer side of the motor rotor in the motor rotor, the hollow part communicates with the end of the motor rotor for connecting the compression unit rotating part of the compressor. In the compressor having the motor rotor, an intake passage communicating with the hollow part can be formed between the compression unit rotating part and the motor rotor. Through the intake passage, the fluid in the compression unit rotating part can enter the hollow part. As the motor rotor rotates, the fluid can flow out from the ventilation hole to the motor accommodation cavity, thereby cooling the inside of the motor rotor, solving the problem of concentrated heat generation of the motor rotor, facilitating ensuring sufficient cooling of the motor in the compressor, and achieving efficient and reliable operation.

[0059] As Figures 1 to 3 、 Figure 6 shown, the motor rotor 21 is located in the motor accommodation cavity 14 and passes through the rotor mounting hole 31. The motor rotor 21 has a hollow part and a ventilation hole ( Figure 1 the ventilation hole is not shown), and the ventilation hole communicates with both the hollow part and the motor accommodation cavity 14.

[0060] The compression unit rotating part is located in the compression cavity, fixedly connected to the end of the motor rotor 21, and forms an intake passage communicating with the hollow part between the compression unit rotating part and the motor rotor 21. The fluid in the compression cavity enters the hollow part through the intake passage and enters the motor accommodation cavity 14 through the ventilation hole.

[0061] As Figure 1 shown, in some embodiments, the housing 10 includes a motor cylinder 11 and a first volute 12 and a second volute 13 respectively arranged at the axial two ends ( Figure 1 the left and right ends in

[0062] As Figure 1As shown, in some embodiments, the compressor may be a centrifugal compressor, and the rotating part of the compression unit is the impeller of the centrifugal compressor. The rotating part of the compression unit may be provided only on one side of the motor rotor, or 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 rotating part of the compression unit is an impeller, the number of impellers on one side of the motor rotor may be one or more than two.

[0063] As Figure 1 As shown, in some embodiments, the compressor rotor 20 includes a motor rotor 21, a first-stage impeller 22, and a second-stage impeller 23. The compressor rotor 20 further includes a first locking rod 24, a second locking rod 25, a first locking nut 26, and a second locking nut 27. The first-stage impeller 22 is fixed to the left end of the motor rotor 21 through the first locking rod 24 and the first locking nut 26, and the second-stage impeller 23 is fixed to the right end of the motor rotor 21 through the second locking rod 25 and the second locking nut 27. The first locking rod 24 and the second locking rod 25 may be integrally provided with the motor rotor 21 or may be separately provided and then connected together through a connection method such as threaded connection. Corresponding to the first-stage impeller 22 and the second-stage impeller 23, there are two compression chambers, namely a first-stage compression chamber 15 and a second-stage compression chamber 16. 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.

[0064] In some embodiments not shown, the compressor may have other rotating parts of the compression unit. For example, the rotating part of the compression unit may be a screw, and it is not excluded to be a moving scroll, a roller, etc.

[0065] As Figure 1 As shown, 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 60, a second bearing housing 80, a second radial bearing 90, and a first thrust bearing and a second thrust bearing not labeled.

[0066] As Figure 1 and Figure 6 As shown, the motor stator 30 is fixed to the housing 10 and has a rotor mounting hole 31, and the motor rotor 21 is inserted into the rotor mounting hole 31.

[0067] The first bearing housing 50 and the second bearing housing 80 are respectively fixed inside the motor cylinder 11 of the housing 10 and are respectively located at the axial two ends of the motor stator 30. 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 respectively support the two axial ends of the motor rotor 21, thereby supporting the motor rotor 21 in the motor accommodation cavity 14 inside the motor cylinder 11 of the housing 10.

[0068] The compressor rotor 20 further includes a thrust disk 28 disposed at one axial end ( Figure 1 the left end in the following) of the motor rotor 21. A first thrust bearing is provided between the first bearing housing 50 and the thrust disk 28, and a second thrust bearing is provided at one end of the first diffuser 40 facing away from the diffusing structure on the diffuser 40. Thus, the motor rotor 21 is axially limited within the motor accommodation cavity 14 of the housing 10.

[0069] The first diffuser 40 and the second diffuser 70 respectively have diffusing structures, such as vanes or diffusing surfaces, and integrated sealing structures, such as comb teeth, so that the first diffuser 40 and the second diffuser 70 are also respectively used to isolate the first-stage compression cavity 15 from the motor accommodation cavity 14 and isolate the space where the second-stage compression cavity 16 and the second impeller 23 are located from the motor accommodation cavity 14, preventing the fluid in the first-stage compression cavity 15 and the second-stage compression cavity 16 from leaking into the motor accommodation cavity 14 through the gaps between the compressor rotor 20 and the first diffuser 40 and between the compressor rotor 20 and the second diffuser 70.

[0070] As Figures 1 to 3 and Figure 6 shown, in some embodiments, the motor rotor includes a permanent magnet 211. The permanent magnet 211 can generate a magnetic field for driving the motor rotor 21 and the compressor rotor 20 to rotate when the windings of the motor stator 30 are energized.

[0071] The embodiments of the present disclosure are applicable to the motor cooling of various compressors, especially applicable to the motor cooling of compressors using permanent magnet synchronous motors, which is beneficial to solving the problem of uniform motor cooling and avoiding the demagnetization of permanent magnets caused by the long-term operation of the motor rotor in a high-temperature environment, thereby avoiding motor damage.

[0072] As Figures 1 to 3 and Figure 6 shown, in some embodiments, the motor rotor 21 includes a permanent magnet 211, a first end shaft section 212, and a second end shaft section 213.

[0073] The permanent magnet 211 can be a solid cylinder as Figure 2 shown, or can be a hollow cylinder with a through hole as Figure 3 shown. The permanent magnet 211, together with the motor stator 30, constitutes a motor for driving the compressor rotor 20 to rotate. The material of the permanent magnet 211 is, for example, magnetic steel.

[0074] 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.

[0075] As Figure 2 and Figure 3As shown, in some embodiments, the motor rotor 21 further includes a mounting sleeve 214 integrally provided at one end of the first end shaft section 212 close to the permanent magnet 211. The permanent magnet 211 and the second end shaft section 213 are fixedly installed in the mounting sleeve 214 by shrink fitting.

[0076] 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 shrink fitting.

[0077] As Figure 2 and Figure 3 shown, in some embodiments, the first end shaft section 212 includes a first axial hole 2121 and a plurality of first through holes 2122 communicating the first axial hole 2121 with the radial outside of the motor rotor (and the motor accommodation cavity 14). The hollow part includes the first axial hole 2121, and the ventilation holes include the first through holes 2122. The second end shaft section 213 includes a second axial hole 2131 and a plurality of second through holes 2132 communicating the second axial hole 2131 with the radial outside of the motor rotor (and the motor accommodation cavity 14). The hollow part includes the second axial hole 2131, and the ventilation holes include the second through holes 2132.

[0078] As Figure 2 、 Figure 3 and Figure 6 shown, the hollow part and the ventilation holes are axially symmetrically distributed. The hollow part is an axial hole, and the ventilation holes are radial holes. The plurality of ventilation holes are uniformly distributed on the corresponding shaft sections along the axial direction and the circumferential direction respectively. The number and / or the angle of the ventilation holes at both end shaft sections can also be set to be the same. The above various setting methods are beneficial to the dynamic balance of the motor rotor 21.

[0079] The plurality of ventilation holes of the motor rotor 21 can be arranged neatly, or staggered or spirally arranged, etc. The cross-sectional shape of the ventilation holes is not limited, for example, it can be circular, square, triangular and other shapes.

[0080] As Figure 2 shown, in some embodiments, both the first axial hole 2121 and the second axial hole 2131 are axial through holes. Figure 2 In, the permanent magnet 211 is a solid cylinder made of a permanent magnet. At this time, air inlet passages need to be correspondingly provided at both ends of the motor rotor, and each air inlet passage supplies fluid to a part of the hollow part at the corresponding end for cooling the motor rotor 21.

[0081] For better cooling, one or more holes may be formed in the permanent magnet. On the one hand, these holes allow the fluid to enter the interior of the permanent magnet to better cool the motor rotor. On the other hand, the holes that connect the two axial end faces of the permanent magnet among the aforementioned one or more holes can also serve to connect the hollow parts on both sides of the motor rotor. At this time, an air inlet passage may be correspondingly provided at both ends of the motor rotor, or an air inlet passage may be provided only at one end of the motor rotor.

[0082] As Figure 3 shown, 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 has a third axial hole 2111 that connects 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 a diameter less than or equal to 4 mm.

[0083] As Figures 1 to 3 、 Figure 6 shown, in some embodiments, an axial notch for cooperating with the rotating part of the compression unit is provided at the end of the motor rotor 21, and a first leakage groove recessed radially outward is provided on the side wall of the axial notch. The air inlet passage includes the first leakage groove. In Figure 2 or Figure 3 , a first axial notch 2123 is provided at the left end of the first end shaft section 211 at the left end of the motor rotor 21, and a second axial notch 2133 is provided at the right end of the second end shaft section 212 at the right end of the motor rotor 21.

[0084] The following takes the left end face of the motor rotor 21 as an example to illustrate the first leakage groove of an embodiment. As Figure 4 shown, four first leakage grooves 2124 are provided on the side wall of the first axial notch 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 grooves 2124 are evenly distributed along the axial direction of the motor rotor 21. The cross-sectional shape of the first leakage groove 2124 is V-shaped. Figure 4 shown, four first leakage grooves 2124 are provided on the side wall of the first axial notch 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 grooves 2124 are evenly distributed along the axial direction of the motor rotor 21. The cross-sectional shape of the first leakage groove 2124 is V-shaped.

[0085] In Figure 2 the embodiment shown, first leakage grooves are provided in the axial notches at both the left and right ends of the motor rotor 21. In Figure 3 the embodiment shown, a first leakage groove is provided in the axial notch 2133 at the right end of the motor rotor 21.

[0086] As Figure 2 shown, 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.

[0087] As Figure 3As shown, the first axial notch 2123 and the first axial hole 2121 are respectively disposed at two ends of the first end shaft section 212, and are separated by a partition wall 2125 in the middle. The second axial notch 2133 is disposed at the end of the first axial hole 2131.

[0088] In some embodiments, the end face of the rotating part of the compression unit is in cooperation with the end face of the motor rotor 21. A second leakage groove is provided on this end face of the motor rotor 21, and the intake passage includes the second leakage groove.

[0089] In some embodiments, the end face of the rotating part of the compression unit is in cooperation with the end face of the motor rotor 21. A third leakage groove is provided on this end face of the rotating part of the compression unit, and the intake passage includes the third leakage groove.

[0090] In order to introduce the fluid in the compression cavity into the hollow part of the motor rotor 21 through the intake passage, in some embodiments, it may include two or three of the first leakage groove, the third leakage groove, and the second leakage groove at the same time.

[0091] The cross-sectional shapes of the various leakage grooves described above are not limited. Except for the V shape, for example, they can also be arc-shaped, square, trapezoidal, U-shaped, etc. The numbers of the various leakage grooves described above are also not limited. For example, they can also be less than 4 or more than 4. The cross-sectional size of the leakage groove is preferably such that the fluid for cooling the motor rotor 21 can pass through.

[0092] In the above embodiments, the motor rotor 21 includes a three-section structure. The left and right two end shaft sections are processed into hollow structures, and the middle is an integral permanent magnet, which is beneficial to simplifying the structure and reducing assembly. The motor rotor 21 is provided with a plurality of ventilation holes. A plurality of through holes are made on the motor rotor 21 to form honeycomb-like pores. When the motor rotor 21 rotates at a high speed, by flowing fluids such as refrigerant through the hollow part and the ventilation holes, the heat inside the motor rotor 21 can be taken away.

[0093] As Figure 1 、 Figure 5 and Figure 6 shown, in some embodiments, the motor stator 30 has a return through hole provided axially. Part of the fluid in the motor accommodation cavity 14 flows from one end of the motor stator 30 to the other end through the return through hole, and part flows from one end of the motor stator 30 to the other end through the fitting gap 311 between the rotor mounting hole 31 and the motor rotor 21.

[0094] As Figure 1 、 Figure 5 and Figure 6 shown, the return through hole includes: a return air hole 32, located above the compressor rotor 20, for circulating gas; and / or, a return liquid hole 33, located below the compressor rotor 20, for circulating liquid. Refer to Figure 5, in some embodiments, the reflux through - holes include three gas - return holes 32 and three liquid - return holes 33.

[0095] Providing the reflux through - holes can cool the inside of the motor stator 30 and also increase the flow - through area during fluid reflux, which is beneficial to the heat dissipation of the motor.

[0096] As Figure 6 shown, 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 arranged on the inner wall of the motor cylinder 11 of the housing 10, forming a spiral cooling flow - path with the outer peripheral surface of the motor stator 30. The first end of the spiral cooling flow - path is communicated with the cooling fluid inlet 111, and the second end of the spiral cooling flow - path is communicated with the motor accommodation cavity 14 at one end ( Figure 6 the left end shown) of the motor stator 30. The cooling fluid outlet 113 is communicated with the motor accommodation cavity 14 at the other end ( Figure 6 the right end shown) of the motor stator 30. The cooling fluid outlet 113 is arranged at the right end of the motor cylinder 11.

[0097] After the gas in the compression cavity leaks to the hollow part of the motor rotor 21 through the air - intake passage at one or both ends of the motor rotor, it cools the motor rotor 21. Then, under the action of the high - speed rotation of the motor rotor 21, it is thrown out from the ventilation holes on the motor rotor 21 into the motor accommodation cavity 14, taking away the heat inside the motor rotor 21. It mixes with the fluid entering the left end of the motor accommodation cavity 14 through the spiral cooling flow - path, and then flows to the right end of the motor accommodation cavity through the cooperation gap 311 between the reflux through - holes and the rotor mounting hole 31, and finally flows out of the compressor through the cooling fluid outlet 113.

[0098] In the compressor of the present disclosure, the rotor can be supported on the housing by various types of bearings, such as sliding bearings, rolling bearings, hydrostatic bearings, magnetic levitation bearings, etc.

[0099] In some embodiments, the compressor includes a gas bearing, and the compressor rotor 20 is rotatably supported on the housing 10 by the gas bearing. The gas bearing is, for example, a hydrodynamic gas bearing or can also be a hydrostatic gas bearing. Using a gas bearing can use the same gas as the working medium gas compressed by the compressor as the suspension gas, so that the setting position of the ventilation holes of the motor rotor does not need to avoid the installation position of the gas bearing.

[0100] Since the motor rotor has a hollow part, it is beneficial to reduce the weight of the motor rotor and is more suitable for the application of gas bearings.

[0101] As Figure 1 shown, in some embodiments, the aforementioned first radial bearing 60, second radial bearing 90, first thrust bearing, and second thrust bearing are all hydrodynamic gas bearings.

[0102] The following will describe Figures 1 to 6 taking the compressor of each of the above embodiments as an example of a refrigeration compressor used in a refrigerant circulation system to illustrate the working process and principle of the motor cooling fluid circulation.

[0103] The refrigerant serving as the cooling fluid enters the spiral cooling flow path through the cooling fluid inlet 111. The cooling fluid flows spirally between the motor cylinder 11 and the motor stator 30. The cooling fluid flowing in the spiral flow path continuously absorbs heat and reduces the temperature of the surface of the motor stator 30. The refrigerant serving as the 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 from the vent holes of the motor rotor 21 under the action of high-speed rotation to cool the inside of the motor rotor 21. After the refrigerant accumulates at the left end of the motor accommodation chamber 14, a part of it flows to the right end of the motor accommodation chamber 14 through the fitting clearance 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, since a gas return hole 32 is provided in the upper part of the motor stator 30 and a liquid return hole 33 is provided in the lower part, the gaseous refrigerant at the left end of the motor accommodation chamber 14 also flows to the right end of the motor accommodation chamber 14 through the gas return hole 32, and the liquid refrigerant at the left end of the motor accommodation chamber 14 flows to the right end of the motor accommodation chamber 14 through the liquid return hole 33, taking away the heat inside the motor stator 30 and making the motor cooling more sufficient.

[0104] When each radial bearing and each thrust bearing are gas bearings, since each gas bearing is located in the motor accommodation chamber 14, the refrigerant in the motor accommodation chamber 14 can directly supply gas to the gas bearings and cool the gas bearings. Therefore, the compressor of the above embodiments not only helps to solve the problem of cooling the inside of the motor rotor 21, but also can supply gas to the gas bearings of the compressor, eliminating the need for an external gas supply device, and further improving the working stability and reliability of the compressor.

[0105] The compressor of the embodiments of the present disclosure can make the cooling of the motor rotor uniform, eliminate the phenomenon of locally high temperature caused by concentrated heat, and is beneficial to ensuring the safe and reliable operation of the compressor.

[0106] The 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.

[0107] The embodiments of the present disclosure also provide a refrigeration device including the aforementioned compressor. The compressor can be a centrifugal compressor, a screw compressor, etc.

[0108] The refrigerant circulation system and the refrigeration device of the embodiments of the present disclosure have the advantages of the compressor of the embodiments of the present disclosure.

[0109] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure rather than to limit them; although the present disclosure has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: it is still possible to modify the specific implementation manners of the present disclosure or perform equivalent replacements on some technical features, and they should all be covered within the scope of the technical solutions claimed by the present disclosure.

Claims

1. A compressor, characterized in that, Comprising a housing (10), a compressor rotor (20) and a motor stator (30), the housing (10) has a motor accommodation cavity (14) and a compression cavity, the motor stator (30) is fixedly arranged in the motor accommodation cavity (14) and has a rotor mounting hole (31), the compressor rotor (20) is rotatably arranged in the housing (10), and the compressor rotor (20) includes: A motor rotor (21), including a hollow part and a ventilation hole, the hollow part is arranged inside the motor rotor (21) and communicates with the end of the motor rotor (21) for connecting the rotating part of the compression unit of the compressor, the ventilation hole communicates the hollow part with the radial outside of the motor rotor, the motor rotor (21) is located in the motor accommodation cavity (14) and passes through the rotor mounting hole (31), and the ventilation hole communicates with the motor accommodation cavity (14); and The rotating part of the compression unit, located in the compression cavity, is fixedly connected to the end of the motor rotor (21), and an intake passage communicating with the hollow part is formed between one end of the rotating part of the compression unit close to the motor rotor (21) and the end of the motor rotor (21) connecting the rotating part of the compression unit. The intake passage is configured to introduce the fluid in the compression cavity into the hollow part of the motor rotor (21), so that the fluid in the compression cavity enters the hollow part through the intake passage and enters the motor accommodation cavity (14) through the ventilation hole; wherein An axial notch for cooperating with the rotating part of the compression unit is provided at the end of the motor rotor (21), an axial protrusion located in the axial notch for cooperating with the axial notch is provided at one end of the rotating part of the compression unit close to the motor rotor (21), and a first leakage groove recessed radially outward is provided on the side wall of the axial notch. The intake passage includes the first leakage groove; and / or The end face of the rotating part of the compression unit cooperates with the end face of the motor rotor (21), a second leakage groove is provided on the end face of the motor rotor (21), and the intake passage includes the second leakage groove; and / or The end face of the rotating part of the compression unit cooperates with the end face of the motor rotor (21), and a third leakage groove is provided on the end face of the rotating part of the compression unit. The intake passage includes the third leakage groove.

2. The compressor according to claim 1, wherein The motor rotor (21) includes a permanent magnet (211).

3. The compressor according to claim 2, characterized in that, The motor rotor (21) includes: A first end shaft section (212), fixedly arranged at the first end of the permanent magnet (211); and A second end shaft section (213), fixedly arranged at the second end of the permanent magnet (211).

4. The compressor according to claim 3, wherein The first end shaft section (212) includes a first axial hole (2121) and a plurality of first through holes (2122) communicating the first axial hole (2121) with the radial outside of the motor rotor. The hollow part includes the first axial hole (2121), and the ventilation hole includes the first through holes (2122); and / or, The second end shaft section (213) includes a second axial hole (2131) and a plurality of second through holes (2132) that communicate the second axial hole (2131) with the radially outer side of the motor rotor. The hollow portion includes the second axial hole (2131), and the vent holes include the second through holes (2132).

5. The compressor according to claim 4, wherein, Both the first axial hole (2121) and the second axial hole (2131) are axial through holes.

6. The compressor according to claim 4, characterized in that, 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) has a third axial hole (2111) that communicates the first axial hole (2121) and the second axial hole (2131).

7. The compressor according to any one of claims 1 to 6, characterized in that, Inside the motor stator (30), there are axially arranged return through holes. A part of the fluid in the motor accommodation cavity (14) flows from one end of the motor stator (30) to the other end through the return through holes, and a part flows from one end of the motor stator (30) to the other end through the clearance (311) between the rotor mounting hole (31) and the motor rotor (21).

8. The compressor according to claim 7, characterized in that, The return through holes include: Gas return holes (32), located above the motor rotor (21) for gas circulation; and / or, Liquid return holes (33), located below the motor rotor (21) for liquid circulation.

9. The compressor according to any one of claims 1 to 6, characterized in that, On the housing (10), there are provided: A cooling fluid inlet (111); A spiral groove (112), provided on the inner wall of the housing (10), forming a spiral cooling flow path with the outer peripheral surface of the motor stator (30). The first end of the spiral cooling flow path communicates with the cooling fluid inlet (111), and the second end of the spiral cooling flow path communicates with the motor accommodation cavity (14) at one end of the motor stator (30); and A cooling fluid outlet (113), communicating with the motor accommodation cavity (14) at the other end of the motor stator (30).

10. The compressor according to any one of claims 1 to 6, characterized in that, The compressor includes a gas bearing, and the compressor rotor (20) is rotatably supported in the housing (10) by the gas bearing.

11. The compressor according to any one of claims 1 to 6, characterized in that The compressor is a centrifugal compressor, and the compression unit rotating part is an impeller.

12. A refrigerant circulation system, characterized in that, A compressor comprising any one of claims 1 to 11.

13. A refrigeration device, characterized in that, A compressor comprising any one of claims 1 to 11.

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