CN111371221A

CN111371221A - Motor rotor, compressor, refrigerant circulation system and refrigeration equipment

Info

Publication number: CN111371221A
Application number: CN201811595308.XA
Authority: CN
Inventors: 刘华; 张治平; 钟瑞兴; 李宏波; 陈玉辉; 叶文腾; 亓静利
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2018-12-25
Filing date: 2018-12-25
Publication date: 2020-07-03
Also published as: WO2020134422A1

Abstract

The disclosure provides a motor rotor, a compressor, a refrigerant circulating system and refrigeration equipment. The motor rotor includes: a hollow part arranged in the motor rotor and communicated with the end part of the motor rotor used for connecting with the compression unit rotating part of the compressor; and a vent hole communicating the hollow portion with a radial outer side of the motor rotor. The compressor comprises the motor rotor. The motor rotor and the compressor can solve the problem of heating concentration of the motor rotor, are favorable for ensuring sufficient cooling of the motor in the compressor, and realize high-efficiency and reliable operation.

Description

Motor rotor, compressor, refrigerant circulation system and refrigeration equipment

Technical Field

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

Background

Compressors, such as centrifugal compressors, screw compressors, etc., are widely driven using permanent magnet synchronous motors as power. However, the permanent magnet synchronous motor generates excessive heat during use, which causes the temperature of the motor to rise too fast. If the internal temperature of the motor is too high, the aging of the insulating layer of the enameled wire is accelerated, and the insulating property is influenced; particularly, the permanent magnet inside the rotor can cause demagnetization when working in a high-temperature working environment for a long time. Therefore, corresponding heat dissipation and cooling measures need to be taken to take away the heat inside the motor and reduce the temperature of the motor.

To the motor cooling problem, the compressor of prior art adopts evaporation formula or hydrojet formula cooling method cooling motor mostly, and liquid refrigerant mainly is after passing through motor cooling runner, absorbs the heat on stator surface and becomes the gaseous state, and later holds the one end in chamber from the motor and discharges, and the other end that holds the chamber to the motor is flowed to the fit clearance between rethread stator and the rotor, cools off once more the surface of rotor. The above cooling method mainly cools the surfaces of the rotor and the stator, the internal cooling is not sufficient, the temperature concentration phenomenon exists in the rotor, and the better cooling effect cannot be achieved. If the local high temperature is eliminated by increasing the refrigerant supply, the cooling effect is limited, and the performance of the compressor is reduced due to the loss of cooling capacity.

Disclosure of Invention

The utility model aims at providing a motor rotor, compressor, refrigerant circulating system and refrigeration plant, aim at improving the inside cooling effect of motor rotor.

A first aspect of the present disclosure provides an electric machine rotor comprising:

a hollow part disposed inside the motor rotor and communicated with an end of the motor rotor for connecting with a compression unit rotating part of a compressor; and

and the vent hole is communicated with the hollow part and the radial outer side of the motor rotor.

In some embodiments, the electric machine rotor comprises permanent magnets.

In some embodiments, the electric machine rotor comprises:

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

and the second end shaft section is fixedly arranged at the second end of the permanent magnet.

In some embodiments of the present invention, the,

the first end shaft section includes a first axial hole and a plurality of first perforations communicating the first axial hole with a radially outer side of the motor rotor, the hollow portion includes the first axial hole, and the vent hole includes the first perforations; and/or the presence of a gas in the gas,

the second end shaft section includes a second axial hole and a plurality of second perforations that communicate the second axial hole with a radially outer side of the motor rotor, the hollow portion includes the second axial hole, and the vent hole includes the second perforations.

In some embodiments, the first axial bore and the second axial bore are both axial through bores.

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, and the permanent magnet has a third axial hole communicating the first axial hole and the second axial hole.

In some embodiments of the present invention, the,

the end part of the motor rotor is provided with an axial notch matched with the rotating part of the compression unit, and the side wall of the axial notch is provided with a first leakage groove which is recessed towards the radial outer side and communicated with the hollow part; and/or

And a second leakage groove communicated with the hollow part is arranged on the end surface of the motor rotor.

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

In some embodiments, the compressor includes a housing having a motor receiving cavity and a compression cavity, a compressor rotor and a motor stator fixedly disposed in the motor receiving cavity and having a rotor mounting hole, the compressor rotor rotatably disposed in the housing, the compressor rotor comprising:

the motor rotor is positioned in the motor accommodating cavity and penetrates through the rotor mounting hole, and the vent hole is communicated with the motor accommodating cavity; and

and the compression unit rotating part is positioned in the compression cavity, is fixedly connected to the end part of the motor rotor and forms an air inlet passage communicated with the hollow part with the motor rotor, and fluid in the compression cavity enters the hollow part through the air inlet passage and enters the motor accommodating cavity through the vent hole.

In some embodiments of the present invention, the,

the end part of the motor rotor is provided with an axial notch which is used for being matched with the rotating part of the compression unit, the side wall of the axial notch is provided with a first leakage groove which is recessed towards the radial outer side, and the air inlet passage comprises the first leakage groove; and/or

The end face of the rotating part of the compression unit is matched with the end face of the motor rotor, a second leakage groove is formed in the end face of the motor rotor, and the air inlet passage comprises the second leakage groove; and/or

The end face of the compression unit rotating portion is matched with the end face of the motor rotor, a third leakage groove is formed in the end face of the compression unit rotating portion, and the air inlet passage comprises the third leakage groove.

In some embodiments, the motor stator has a backflow through hole arranged along an axial direction, and the fluid in the motor accommodating cavity flows partially from one end of the motor stator to the other end of the motor stator through the backflow through hole and partially from one end of the motor stator to the other end of the motor stator through a fit gap between the rotor mounting hole and the motor rotor.

In some embodiments, the reflow via includes:

the air return hole is positioned above the compressor rotor and used for circulating gas; and/or the presence of a gas in the gas,

and the liquid return hole is positioned below the compressor rotor and used for circulating liquid.

In some embodiments, the housing has disposed thereon:

a cooling fluid inlet;

the spiral groove is arranged on the inner wall of the shell and forms a spiral cooling flow channel with the outer peripheral surface of the motor stator, the first end of the spiral cooling flow channel is communicated with the cooling fluid inlet, and the second end of the spiral cooling flow channel is communicated with the motor accommodating cavity at one end of the motor stator; and

and the cooling fluid outlet is communicated with the motor accommodating cavity at the other end of the motor stator.

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

In some embodiments, the compressor is a centrifugal compressor and the compression unit rotating portion is an impeller.

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.

A fourth aspect of the present disclosure provides a refrigeration apparatus including the compressor of any one of the second aspects of the present disclosure.

Based on this motor rotor and have compressor of this rotor that this disclosure provided, because of set up well kenozooecium and the air vent that all communicates with well kenozooecium and motor rotor radial outside in motor rotor, well kenozooecium and motor rotor be used for with the tip intercommunication of the compression unit rotation portion of being connected the compressor, in the compressor that has this motor rotor, can form the admission passage with well kenozooecium intercommunication between compression unit rotation portion and the motor rotor, can make the interior fluid of compression unit rotation portion get into well kenozooecium through the admission passage, along with motor rotor rotates, this fluid can follow the air vent and flow out to the motor and hold the chamber, thereby can cool off motor rotor inside, can solve motor rotor and generate heat and concentrate the problem, do benefit to and guarantee that motor cooling is abundant in the compressor.

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

Other features of the present disclosure and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the disclosure and together with the description serve to explain the disclosure and not to limit the disclosure. In the drawings:

fig. 1 is a schematic cross-sectional structure diagram of a compressor according to an embodiment of the present disclosure.

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

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

Fig. 4 is a schematic end view of a motor rotor of a compressor according to an embodiment of the present disclosure.

Fig. 5 is a schematic cross-sectional view illustrating a motor stator of a compressor according to an embodiment of the present disclosure.

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

Detailed Description

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present disclosure, it should be understood that the terms "first", "second", etc. are used to define the components, and are used only for convenience of distinguishing the corresponding components, and if not otherwise stated, the terms have no special meaning, and thus, should not be construed as limiting the scope of the present disclosure.

In the description of the present disclosure, it is to be understood that the positional or orientational relationships indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom" are merely for convenience in describing the present disclosure and for simplicity in description, and in the absence of a contrary indication, these directional terms are not intended to indicate and imply that the referenced device or element must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be taken as limiting the scope of the present disclosure; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

As shown in fig. 1 to 6, 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 an end portion of the motor rotor 21 for connecting a compression unit rotating portion of the compressor. The vent hole is communicated with the hollow part and the radial 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 chamber 14 and a compression chamber. The motor stator 30 is fixedly disposed in the motor accommodating chamber 14 and has a rotor mounting hole 31.

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

The utility model discloses electric motor rotor and have compressor of this rotor, because of set up well kenozooecium and the air vent that all communicates with well kenozooecium and the radial outside of electric motor rotor in electric motor rotor, well kenozooecium and electric motor rotor be used for with the tip intercommunication of the compression unit rotation portion of being connected the compressor, in the compressor that has this electric motor rotor, can form the admission passage with well kenozooecium intercommunication between compression unit rotation portion and the electric motor rotor, can make the interior fluid of compression unit rotation portion get into well kenozooecium through the admission passage, along with electric motor rotor rotates, this fluid can flow out to the motor and hold the chamber from the air vent, thereby can cool off electric motor rotor is inside, can solve electric motor rotor and generate heat and concentrate the problem, do benefit to guaranteeing that.

As shown in fig. 1 to 3 and 6, the motor rotor 21 is located in the motor accommodating cavity 14 and passes through the rotor mounting hole 31. The motor rotor 21 has a hollow portion and a vent hole (the vent hole is not shown in fig. 1) that communicates with both the hollow portion and the motor accommodating chamber 14.

The compression unit rotation part is located the compression intracavity, and fixed connection forms the air inlet passage with hollow portion intercommunication between motor rotor 21 and the motor rotor 21 in the motor rotor 21 tip, and the fluid in the compression intracavity gets into hollow portion through the air inlet passage to get into motor and hold chamber 14 through the air vent.

As shown in fig. 1, in some embodiments, the housing 10 includes a motor cylinder 11 and a first volute 12 and a second volute 13 respectively disposed at both axial ends (left and right ends in fig. 1) of the motor cylinder 11.

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

As shown in fig. 1, in some embodiments, 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 primary impeller 22 is fixed to the left end of the motor rotor 21 by a first locking lever 24 and a first locking nut 26, and the secondary impeller 23 is fixed to the right end of the motor rotor 21 by a second locking lever 25 and a second locking nut 27. The first locking lever 24 and the second locking lever 25 may be integrally provided with the motor rotor 21, or may be separately provided and then connected together by a connection method such as a screw connection. Two compression chambers are provided corresponding to the first-stage impeller 22 and the second-stage impeller 23, and are the first-stage compression chamber 15 and the 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, such as a screw, not excluded as an orbiting scroll, a roller, etc.

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 60, a second bearing housing 80, and a second radial bearing 90, and a first thrust bearing and a second thrust bearing, not shown.

As shown in fig. 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 is inserted into the rotor mounting hole 31.

The first bearing seat 50 and the second bearing seat 80 are respectively fixed inside the motor cylinder 11 of the housing 10 and are respectively located at two axial ends of the motor stator 30. A first radial bearing 60 is located within the first bearing housing 50 and a second radial bearing 90 is located within the second bearing housing 80. The first radial bearing 60 and the second radial bearing 90 are respectively supported at both axial ends of the motor rotor 21, thereby supporting the motor rotor 21 in the motor accommodating chamber 14 in the motor cylinder 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 arranged between the first bearing seat 50 and the thrust disk 28, and a second thrust bearing is arranged at the end of the first diffuser 40 facing away from the diffuser structure on the diffuser 40, so that the motor rotor 21 is axially confined in the motor accommodating chamber 14 of the housing 10.

The first diffuser 40 and the second diffuser 70 respectively have a diffuser structure, such as a vane or a diffuser surface, and are integrated with a sealing structure, such as a comb tooth, so that the first diffuser 40 and the second diffuser 70 are also used for isolating the space where the first-stage compression cavity 15 and the motor accommodating cavity 14 are located and isolating the second impeller 23 of the second-stage compression cavity 16 and the motor accommodating cavity 14, respectively, and prevent the fluid in the first-stage compression cavity 15 and the second-stage compression cavity 16 from leaking into the motor accommodating cavity 14 through the gap between the compressor rotor 20 and the first diffuser 40 and the gap between the compressor rotor 20 and the second diffuser 70.

As shown in fig. 1-3, 6, in some embodiments, the motor rotor includes permanent magnets 211. The permanent magnet 211 may 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.

The embodiment of the disclosure is suitable for cooling motors of various compressors, is particularly suitable for cooling the motor of the compressor adopting the permanent magnet synchronous motor, is favorable for solving the problem of uniformity of motor cooling, and is favorable for avoiding motor damage caused by demagnetization of a permanent magnet due to long-term operation of a motor rotor in a high-temperature environment.

As shown in fig. 1-3, 6, in some embodiments, electric machine 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 may be a hollow cylinder having a through hole as shown in fig. 3. The permanent magnet 211 as the motor rotor 21 and the motor stator 30 together form a motor for driving the compressor rotor 20 to rotate. The material of the permanent magnet 211 is, for example, magnetic steel.

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

As shown in fig. 2 and 3, in some embodiments, electric machine rotor 21 further includes a mounting sleeve 214 integrally disposed at an end of first end shaft segment 212 proximate permanent magnet 211. The permanent magnet 211 and the second end shaft section 213 are fixedly mounted in the mounting sleeve 214 by shrink-fitting.

In some embodiments, not shown, a separate mounting sleeve may be provided, and the first end shaft segment, the permanent magnet and the second end shaft segment are all nested within the mounting sleeve by way of a shrink fit.

As shown in fig. 2 and 3, in some embodiments, first end shaft segment 212 includes a first axial bore 2121 and a plurality of first perforations 2122 communicating first axial bore 2121 with the radially outer side of the motor rotor (and motor housing cavity 14), the hollow portion includes first axial bore 2121, and the vent hole includes first perforations 2122. The second end shaft segment 213 includes a second axial hole 2131 and a plurality of second perforations 2132 that communicate the second axial hole 2131 with the radially outer side of the motor rotor (and the motor accommodating chamber 14), the hollow portion includes the second axial hole 2131, and the vent hole includes the second perforations 2132.

As shown in fig. 2, 3 and 6, the hollow portion and the vent hole are axisymmetrically distributed. The hollow part is an axial hole, and the vent holes are radial holes. The plurality of vent holes are respectively and uniformly distributed on the corresponding shaft sections along the axial direction and the circumferential direction. The number of the ventilation holes of the two end shaft sections can be set to be the same and/or the angle can be set to be the same. The above arrangements facilitate dynamic balancing of the motor rotor 21.

The plurality of ventilation holes of the motor rotor 21 may be regularly arranged, or may be arranged in a staggered manner or in a spiral manner. The cross-sectional shape of the vent hole is not limited, and may be, for example, a circular shape, a square shape, a triangular shape, or the like.

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

For better cooling, the permanent magnets may be provided with one or several holes. These holes allow, on the one hand, the entry of fluid inside the permanent magnets for better cooling of the motor rotor and, on the other hand, the hole or holes communicating with the two axial end faces of the permanent magnets, also serve to communicate with the hollows on both sides of the motor rotor. In this case, the intake passage may be provided at both ends of the motor rotor, or the 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, and the permanent magnet 211 has a third axial hole 2111 communicating with the first axial hole 2121 and the second axial hole 2131. The size of the third axial bore 2111 is preferably less than or equal to 4mm in diameter, subject to the permanent magnet material.

As shown in fig. 1 to 3 and 6, in some embodiments, the end of the motor rotor 21 is provided with an axial recess for engaging with the rotating portion of the compression unit, a first leakage groove recessed radially outward is provided on a side wall of the axial recess, and the intake passage includes the first leakage groove. In fig. 2 or 3, a first axial notch 2123 is provided at a 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 a right end of the second end shaft section 212 at the right end of the motor rotor 21.

The first leakage groove of an embodiment will be described 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 a side wall of the first axial recess 2123 of the left end portion of the first end shaft section 211 of the left end of the motor rotor 21. Four first leak grooves 2124 are uniformly distributed in the axial direction of the motor rotor 21. The cross-sectional shape of the first leakage groove 2124 is V-shaped.

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

As shown in fig. 2, a first axial recess 2123 is provided at an end of the first axial hole 2121, and a second axial recess 2133 is provided at an end of the first axial hole 2131.

As shown in fig. 3, the first axial recess 2123 and the first axial hole 2121 are provided at both ends of the first end shaft section 212, and are separated by a separation wall 2125. The second axial recess 2133 is provided at an end of the first axial hole 2131.

In some embodiments, an end surface of the rotating portion of the compression unit is engaged with an end surface of the motor rotor 21, the end surface of the motor rotor 21 is provided with a second leakage groove, and the intake passage includes the second leakage groove.

In some embodiments, an end surface of the compression unit rotating portion is fitted with an end surface of the motor rotor 21, the end surface of the compression unit rotating portion is provided with a third leakage groove, and the intake passage includes the third leakage groove.

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

The cross-sectional shape of the various leakage grooves is not limited, and may be, for example, an arc shape, a square shape, a trapezoidal shape, a U-shape, or the like, in addition to the V-shape. The number of the various leakage grooves is not limited, and may be, for example, less than 4 or greater than 4. The cross-sectional size of the leakage grooves is preferably such that it is sufficient for the passage of fluid for cooling the motor rotor 21.

In the above embodiment, the motor rotor 21 includes a three-section structure, the left and right end shaft sections are processed into a hollow structure, and the middle is an integral permanent magnet, which is beneficial to simplifying the structure and reducing the assembly. The motor rotor 21 is formed with a plurality of ventilation holes, and a plurality of perforations are formed in the motor rotor 21 to form honeycomb-shaped pores, so that when the motor rotor 21 rotates at a high speed, heat inside the motor rotor 21 can be taken away by flowing a fluid such as a refrigerant through the hollow portion and the ventilation holes.

As shown in fig. 1, 5 and 6, in some embodiments, the motor stator 30 has axially disposed return through-holes therein. The fluid in the motor accommodating chamber 14 flows partially from one end of the motor stator 30 to the other end of the motor stator 30 through the return through hole, and partially flows from one end of the motor stator 30 to the other end of the motor stator 30 through the fitting gap 311 between the rotor mounting hole 31 and the motor rotor 21.

As shown in fig. 1, 5 and 6, the reflow via hole includes: a return air hole 32 located above the compressor rotor 20 for circulating air; and/or, a liquid return hole 33 is positioned below the compressor rotor 20 for circulating liquid. Referring to fig. 5, in some embodiments, the return through-holes include three return air holes 32 and three return liquid holes 33.

The backflow through holes are arranged, so that the interior of the motor stator 30 can be cooled, the flow area of the fluid during backflow is increased, and the heat dissipation of the motor is facilitated.

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 disposed on the inner wall of the motor cylinder 11 of the housing 10, and forms a spiral cooling flow passage with the outer circumferential surface of the motor stator 30, a first end of the spiral cooling flow passage is communicated with the cooling fluid inlet 111, and a second end of the spiral cooling flow passage is communicated with the motor accommodating chamber 14 at one end (left end shown in fig. 6) of the motor stator 30. The cooling fluid outlet 113 communicates with the motor accommodating chamber 14 at the other end (right end in fig. 6) of the motor stator 30. The cooling fluid outlet 113 is provided at the right end of the motor cylinder 11.

After gas in the compression cavity leaks to the hollow part of the motor rotor 21 through the gas inlet passage at one end or two ends of the motor rotor, the motor rotor 21 is cooled, then the gas is thrown out of the vent holes in the motor rotor 21 to the motor accommodating cavity 14 under the action of high-speed rotation of the motor rotor 21, the heat inside the motor rotor 21 is taken away, the gas is mixed with fluid entering the left end of the motor accommodating cavity 14 through the spiral cooling flow channel, then the gas flows to the right end of the motor accommodating cavity through the backflow through hole and the matching gap 311 between the rotor mounting hole 31 and the motor rotor 21, and then the gas 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 by various types of bearings, such as a sliding bearing, a rolling bearing, a fluid bearing, a magnetic levitation bearing, and the like.

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

The motor rotor is provided with the hollow part, so that the weight of the motor rotor is favorably reduced, and the motor rotor is more suitable for gas bearing application.

As shown in fig. 1, in some embodiments, the first radial bearing 60, the second radial bearing 90, the first thrust bearing, and the second thrust bearing are all hydrodynamic gas bearings.

The operation and principle of the motor cooling fluid circulation will be described below with reference to fig. 1 to 6, taking the refrigeration compressor used as a refrigerant circulation system as an example for the compressor of each of the above embodiments.

A cooling medium as a cooling fluid enters the spiral cooling flow passage through the cooling fluid inlet 111, the cooling fluid spirally flows between the motor cylinder 11 and the motor stator 30, and the cooling fluid flowing in the spiral flow passage continuously absorbs heat to lower the temperature of the surface of the motor stator 30. The refrigerant, which is a cooling fluid, leaked from both end portions of the motor rotor 21 enters the hollow portion of the motor rotor 21, absorbs heat inside the motor rotor 21, and is then ejected from the vent hole of the motor rotor 21 by high-speed rotation, thereby cooling the inside of the motor rotor 21. After the refrigerant is gathered at the left end of the motor accommodating cavity 14, a part of the refrigerant flows to the right end of the motor accommodating cavity 14 through a matching gap 311 between the motor stator 30 and the motor rotor 21, and absorbs the heat on the outer surface of the motor rotor 21. Meanwhile, because motor stator 30 upper portion sets up return air hole 32, the lower part is equipped with liquid return hole 33, the gaseous state refrigerant that the motor held 14 left ends in chamber also can hold 14 right-hand members in chamber through return air hole 32 flow direction motor, and the liquid state refrigerant that the motor held 14 left ends in chamber can hold 14 right-hand members in chamber through liquid return hole 33 flow direction motor, takes away the inside heat of motor stator 30, makes the motor cooling more abundant.

When each radial bearing and each thrust bearing are gas bearings, because each gas bearing is located in the motor accommodating cavity 14, the refrigerant in the motor accommodating cavity 14 can directly supply gas to the gas bearings and cool the gas bearings. Therefore, the compressor of the above embodiment is not only beneficial to solving the problem of cooling the inside of the motor rotor 21, but also can supply air to the gas bearing of the compressor, thereby omitting an external air supply device and further improving the working stability and reliability of the compressor.

The compressor disclosed by the embodiment of the disclosure can enable the motor rotor to be cooled uniformly, eliminate the phenomenon of high local temperature caused by concentrated heat and be beneficial to ensuring the safe and reliable operation of the compressor.

The embodiment of the present disclosure further provides a refrigerant circulation system, including the compressor. At this time, the working medium of the compressor is the refrigerant in the refrigerant circulating system.

The embodiment of the disclosure also provides a refrigeration device, which comprises the compressor. The compressor may be a centrifugal compressor, a screw compressor, or the like.

The refrigerant circulation system and the refrigeration equipment of the embodiment of the disclosure have the advantages of the compressor of the embodiment of the disclosure.

Finally, it should be noted that: the above examples are intended only to illustrate the technical solutions of the present disclosure and not to limit them; although the present disclosure has been described in detail with reference to preferred embodiments, those of ordinary skill in the art will understand that: modifications to the embodiments of the disclosure or equivalent replacements of parts of the technical features may be made, which are all covered by the technical solution claimed by the disclosure.

Claims

1. An electric machine rotor, comprising:

2. An electric machine rotor, according to claim 1, characterized in that it comprises permanent magnets (211).

3. The electric machine rotor as recited in claim 2, comprising:

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

a second end shaft section (213) fixedly arranged at a second end of the permanent magnet (211).

4. The electric machine rotor of claim 3,

the first end shaft segment (212) comprises a first axial bore (2121) and a plurality of first perforations (2122) communicating the first axial bore (2121) with a radially outer side of the electric machine rotor, the hollow comprises the first axial bore (2121), and the vent comprises the first perforations (2122); and/or the presence of a gas in the gas,

the second end shaft segment (213) includes a second axial hole (2131) and a plurality of second perforations (2132) that communicate the second axial hole (2131) with a radial outer side of the motor rotor, the hollow portion includes the second axial hole (2131), and the vent hole includes the second perforations (2132).

5. The electric machine rotor according to claim 4, characterized in that the first axial hole (2121) and the second axial hole (2131) are each axial through holes.

6. An electric machine rotor, according to claim 4, characterized in that one of said first axial hole (2121) and said second axial hole (2131) is an axial through hole, the other is a blind hole with an open end facing said permanent magnet (211), said permanent magnet (211) having a third axial hole (2111) communicating said first axial hole (2121) and said second axial hole (2131).

7. The electric machine rotor of claim 1,

the end part of the motor rotor (21) is provided with an axial notch matched with the rotating part of the compression unit, and the side wall of the axial notch is provided with a first leakage groove which is recessed towards the radial outer side and communicated with the hollow part; and/or

And a second leakage groove communicated with the hollow part is arranged on the end surface of the motor rotor (21).

8. Compressor, characterized in that it comprises an electric machine rotor (21) according to any one of claims 1 to 7.

9. The compressor of claim 8, comprising a housing (10), a compressor rotor (20) and a motor stator (30), wherein the housing (10) has a motor accommodating chamber (14) and a compression chamber, the motor stator (30) is fixedly disposed in the motor accommodating chamber (14) and has a rotor mounting hole (31), the compressor rotor (20) is rotatably disposed in the housing (10), and the compressor rotor (20) comprises:

the motor rotor (21) is positioned in the motor accommodating cavity (14) and penetrates through the rotor mounting hole (31), and the vent hole is communicated with the motor accommodating cavity (14); and a compression unit rotating part which is positioned in the compression cavity, is fixedly connected to the end part of the motor rotor (21) and forms an air inlet passage communicated with the hollow part with the motor rotor (21), and fluid in the compression cavity enters the hollow part through the air inlet passage and enters the motor accommodating cavity (14) through the vent hole.

10. The compressor of claim 9,

the end part of the motor rotor (21) is provided with an axial notch matched with the rotating part of the compression unit, the side wall of the axial notch is provided with a first leakage groove which is recessed towards the radial outer side, and the air inlet passage comprises the first leakage groove; and/or

The end face of the rotating part of the compression unit is matched with the end face of the motor rotor (21), a second leakage groove is formed in the end face of the motor rotor (21), and the air inlet passage comprises the second leakage groove; and/or

The end face of the compression unit rotating portion is matched with the end face of the motor rotor (21), a third leakage groove is formed in the end face of the compression unit rotating portion, and the air inlet passage comprises the third leakage groove.

11. The compressor of claim 9, wherein the motor stator (30) has a backflow through hole formed therein in an axial direction, and the fluid in the motor receiving chamber (14) flows partially from one end of the motor stator (30) to the other end of the motor stator (30) through the backflow through hole, and partially from one end of the motor stator (30) to the other end of the motor stator (30) through a fitting gap (311) between the rotor mounting hole (31) and the motor rotor (21).

12. The compressor of claim 11, wherein the return through-hole comprises:

a return air hole (32) located above the compressor rotor (20) for circulating air; and/or the presence of a gas in the gas,

and the liquid return hole (33) is positioned below the compressor rotor (20) and is used for circulating liquid.

13. Compressor according to claim 9, characterized in that the shell (10) is provided with:

a cooling fluid inlet (111);

the spiral groove (112) is arranged on the inner wall of the shell (10) and forms a spiral cooling flow channel with the outer peripheral surface of the motor stator (30), the first end of the spiral cooling flow channel is communicated with the cooling fluid inlet (111), and the second end of the spiral cooling flow channel is communicated with the motor accommodating cavity (14) at one end of the motor stator (30); and

and a cooling fluid outlet (113) communicating with the motor accommodating chamber (14) at the other end of the motor stator (30).

14. Compressor according to any one of claims 8 to 13, characterized in that it comprises a gas bearing by means of which the compressor rotor (20) is rotatably supported within the housing (10).

15. The compressor of any one of claims 8 to 13, wherein the compressor is a centrifugal compressor and the compression unit rotating part is an impeller.

16. A refrigerant circulation system comprising the compressor of any one of claims 8 to 15.

17. A refrigeration apparatus, characterized by comprising a compressor according to any one of claims 8 to 15.