Motor rotor and compressor with internal flow channel

Abstract

The present invention discloses a motor rotor, comprising: a permanent magnet; and a main shaft, which is arranged outside the permanent magnet and is used to carry the permanent magnet and make the permanent magnet rotate around the rotating shaft of the motor rotor; wherein the main shaft is provided with a flow channel, and the two ends of the flow channel are respectively connected to the permanent magnet and the outside of the main shaft, so that the cooling medium outside the main shaft can be conducted to the permanent magnet through the flow channel. In the embodiment of the present invention, by opening a flow channel connected to the permanent magnet on the main shaft, the permanent magnet can be cooled by the cooling medium outside the main shaft, so as to improve the heat dissipation effect of the main shaft and the permanent magnet.

Description

Technical Field

[0001] The invention relates to the field of air conditioning, and in particular to a motor rotor and a compressor with an internal flow channel. Background Art

[0002] At present, air conditioners compress refrigerant by driving compressors with motors. When existing central air conditioners use high-power motors, tens of kilowatts of heat will be generated between the motor rotor and the motor stator. This high heat generation is usually harmful. The motor rotor and motor stator that are at high temperature for a long time will reduce the service life, increase the failure rate, and in serious cases, demagnetize the permanent magnets in the motor rotor. Therefore, it is necessary to dissipate the heat generated by the rotation of the motor rotor from the inside of the compressor motor as quickly as possible through a reasonable heat dissipation method to keep the motor temperature within a reasonable range.

[0003] At present, the heat dissipation media used by relevant air-conditioning motors include: forced air cooling, forced water cooling and refrigerant cooling. Among them, refrigerant cooling is the best cooling solution because of the high thermal conductivity of the refrigerant and the ability to ensure the insulation level of the motor and the cleanliness of the environment in which the internal electrical components are located.

[0004] Correspondingly, the refrigerant cooling and heat dissipation scheme in the relevant air-conditioning motor is as follows: a refrigerant inlet is opened on the barrel of the motor, and a spiral cooling channel is added on the inner surface of the barrel. The motor stator is fixed to the inner surface of the barrel by means of a shrink sleeve, so as to form a closed cavity in cooperation with the spiral cooling channel on the inner surface of the barrel. The refrigerant enters the spiral cooling channel through the opening at one end of the motor, absorbs the heat of the motor stator through vaporization, and the vaporized cooling medium is discharged from the spiral cooling channel at the other end of the motor, and gathers in the motor cavity to form high pressure, and then flows through the air gap channel between the motor stator and the motor rotor, thereby absorbing the heat of the motor rotor, and finally the refrigerant that has absorbed the motor stator is discharged from the outlet of the motor barrel.

[0005] The above refrigerant cooling and heat dissipation solution has some technical problems:

[0006] The refrigerant has the lowest temperature near the entrance of the spiral cooling channel and has the strongest heat dissipation capacity. As the refrigerant flows, the liquid refrigerant gradually absorbs heat and evaporates, and the heat dissipation capacity gradually weakens. Until the exit of the spiral cooling channel, the refrigerant has the weakest heat absorption capacity, resulting in poor uniformity of the temperature field on the surface of the motor stator.

[0007] In addition, although the gaseous refrigerant that enters the gap between the motor stator and the motor rotor from the other end of the motor can take away the heat by flowing, the gaseous refrigerant that enters the gap can only cool the surface of the rotor and cannot cool the inside of the rotor in time, causing local high temperature of the motor. At this time, if the motor works in a high temperature environment for a long time, it may cause the permanent magnet in the motor rotor to demagnetize, directly affecting the motor performance; in severe cases, it may even cause the motor to fail to operate normally, posing a hidden danger to the reliability of the compressor. Summary of the invention

[0008] At least one object of the present invention is to provide a motor rotor with an internal flow channel, by opening a flow channel connected to the permanent magnet on the main shaft, so that the permanent magnet can be cooled by the cooling medium outside the main shaft, so as to improve the heat dissipation effect of the main shaft and the permanent magnet. The many technical effects that can be produced by the preferred technical solution among the many technical solutions provided by the present invention are described in detail below.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] The present invention provides a motor rotor, comprising: a permanent magnet; and a main shaft, which is arranged outside the permanent magnet and is used to carry the permanent magnet and make the permanent magnet rotate around the rotating shaft of the motor rotor; wherein the main shaft is provided with a flow channel, and the two ends of the flow channel are respectively connected to the permanent magnet and the outside of the main shaft, so that the cooling medium outside the main shaft can be conducted to the permanent magnet through the flow channel.

[0011] As an optimization of any technical solution or any optimized technical solution provided above or below the present invention, the main shaft has a shoulder, and the flow channel is opened from the end face of the shoulder perpendicular to the main shaft axis, obliquely toward the permanent magnet to the axis of the main shaft.

[0012] As an optimization of any technical solution or any optimized technical solution provided above or below the present invention, the number of the flow channels is 4 to 8, and the flow channels are evenly opened on the main shaft along the circumference of the main shaft.

[0013] As an optimization of any technical solution or any optimized technical solution provided above or below the present invention, the number of the flow channels is an even number, and the aperture range of the flow channels is 3 to 5 mm.

[0014] As an optimization of any technical solution or any optimized technical solution provided above or below the present invention, the permanent magnet includes at least one through hole along the axial direction of the main shaft, and the through hole is connected to the flow channel, so that the cooling medium can flow through the interior of the permanent magnet.

[0015] As an optimization of any technical solution or any optimized technical solution provided in the foregoing or later text of the present invention, the main shaft includes: a first shaft segment, having a first shaft shoulder, and abutting against the first end of the permanent magnet; a second shaft segment, having a first shaft ring, and abutting against the second end of the permanent magnet; and a sleeve, which is mounted on the outside of the first shaft segment, the permanent magnet and the second shaft segment, and is positioned along the axial direction of the main shaft through the first shaft ring.

[0016] As an optimization of any technical solution or any optimized technical solution provided in the foregoing or later text of the present invention, the flow channel is opened from the end face of the first shoulder perpendicular to the axis of the main shaft, and the end face of the first collar perpendicular to the axis of the main shaft and away from the permanent magnet, obliquely toward the permanent magnet to the axis of the main shaft.

[0017] As an optimization of any technical solution or any optimized technical solution provided above or below the present invention, the outer diameter of the sheath is consistent with the outer diameter of the first shaft ring.

[0018] As an optimization of any technical solution or any optimized technical solution provided above or below the present invention, the first shaft segment and the second shaft segment have the same outer diameter and are interference fit with the sleeve.

[0019] As an optimization of any technical solution or any optimized technical solution provided in the foregoing or later text of the present invention, the first shaft segment, the second shaft segment and the permanent magnet respectively have positioning grooves along the axial direction of the main shaft, and the positioning grooves can be inserted with guide rods, thereby positioning the first shaft segment, the second shaft segment and the permanent magnet along the circumferential direction of the main shaft.

[0020] The present invention also provides a compressor, comprising: a cylinder; a motor stator installed on the cylinder; and a motor rotor, as described above, rotatably installed on the cylinder and arranged inside the electrode stator, capable of rotating relative to the electrode stator under the drive of electromagnetic force.

[0021] As an optimization of any technical solution or any optimized technical solution provided in the foregoing or later text of the present invention, a spiral cooling channel extending along the axial direction of the main shaft is provided between the motor stator and the cylinder, and a gap channel is provided between the motor stator and the motor rotor; the refrigerant of the compressor can flow through the spiral cooling channel, the gap channel, the flow channel of the main shaft and the through hole in the permanent magnet, so as to cool the motor stator and the motor rotor.

[0022] As an optimization of any technical solution or any optimized technical solution provided above or below the present invention, the compressor includes: a refrigerant inlet, opened at one end of the cylinder, for introducing the refrigerant into the spiral cooling channel; and a refrigerant outlet, opened in the cylinder and at the same end of the cylinder as the refrigerant inlet, capable of guiding the refrigerant after cooling the motor stator and the motor rotor out of the compressor.

[0023] Based on the above technical solution, the embodiment of the present invention opens a flow channel connected to the permanent magnet on the main shaft so that the permanent magnet can be cooled by the cooling medium outside the main shaft, thereby improving the heat dissipation effect of the main shaft and the permanent magnet. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0025] Figure 1 A schematic diagram of the cross-sectional structure of a motor rotor passing through an axis line provided by an embodiment of the present invention;

[0026] Figure 2 A schematic diagram of the structure of a compressor provided by an embodiment of the present invention;

[0027] Figure 3 This is a schematic structural diagram of the cross-sectional angle of the motor rotor perpendicular to the axial direction provided by an embodiment of the present invention.

[0028] Figure numerals: 1. permanent magnet, 11. through hole, 2. main shaft, 21. flow channel, 22. first shaft section, 221. first shaft shoulder, 23. second shaft section, 231. first shaft ring, 24. sleeve, 3. motor stator, 4. cylinder, 5. spiral cooling channel, 6. gap channel, 7. refrigerant inlet, 8. refrigerant outlet. DETAILED DESCRIPTION

[0029] The contents of the present invention and the differences between the present invention and the prior art can be understood with reference to the accompanying drawings and text content. The technical scheme (including the preferred technical scheme) of the present invention is further described in detail below by means of the accompanying drawings and by listing some optional embodiments of the present invention. It should be noted that any technical feature and any technical scheme in the present embodiment are one or more of a variety of optional technical features or optional technical schemes. In order to describe the need for brevity, it is impossible to list all the alternative technical features and alternative technical schemes of the present invention in this document, and it is not convenient for the implementation method of each technical feature to emphasize that it is one of the multiple optional implementation methods. Therefore, those skilled in the art should know that any technical means provided by the present invention can be replaced or any two or more technical means or technical features provided by the present invention can be combined with each other to obtain a new technical scheme.

[0030] Any technical features and any technical solutions in this embodiment do not limit the protection scope of the present invention. The protection scope of the present invention should include any alternative technical solutions that can be thought of by those skilled in the art without creative work, as well as new technical solutions obtained by those skilled in the art by combining any two or more technical means or technical features provided by the present invention.

[0031] The following is combined with Figures 1 to 3 The technical solution provided by the present invention is described in more detail.

[0032] like Figure 1 As shown, a motor rotor provided by the present invention comprises: a permanent magnet 1; and a main shaft 2, which is arranged outside the permanent magnet 1 and is used to carry the permanent magnet 1 and make the permanent magnet 1 rotate around the rotating shaft of the motor rotor; wherein the main shaft 2 is provided with a flow channel 21, and the two ends of the flow channel 21 are respectively connected to the permanent magnet 1 and the outside of the main shaft 2, so that the cooling medium outside the main shaft 2 can be conducted to the permanent magnet 1 through the flow channel 21.

[0033] Since the rotation of the motor rotor depends on the magnetic field generated by the permanent magnet 1, the embodiment of the present invention wraps the permanent magnet 1 inside the main shaft 2, and opens a flow channel 21 in the main shaft 2 to achieve airflow interaction between the permanent magnet 1 and the outside of the main shaft 2, so that the permanent magnet 1 can be cooled by the cooling medium outside the main shaft 2.

[0034] After the cooling medium outside the spindle 2 is conducted to the permanent magnet 1, the permanent magnet 1 and the inside of the spindle 2 can be cooled in various ways. For example, a corresponding cooling channel 21 can be provided on the surface where the spindle 2 and the permanent magnet 1 are connected, so that the cooling medium can flow through the outer surface of the permanent magnet 1 and the inner surface of the spindle 2; or a certain gap can be provided between the permanent magnet 1 and the spindle 2, so that the cooling medium can flow through the gap between the permanent magnet 1 and the spindle 2 to cool both.

[0035] like Figure 1 , Figure 3 As shown, as an optimization of any technical solution or any optimized technical solution provided in the foregoing or later text of the present invention, the main shaft 2 has a shoulder, and the flow channel 21 is opened from the end face of the shoulder perpendicular to the axis of the main shaft 2, obliquely toward the permanent magnet 1 to the axis of the main shaft 2.

[0036] The flow channel 21 is opened from the shoulder of the main shaft 2 and extends obliquely to the permanent magnet 1, so that the length of the flow channel 21 can be made as long as possible and the inlet of the flow channel 21 can simultaneously receive the cooling medium of the flow channel 21 in both the axial and radial directions of the main shaft 2.

[0037] Since the flow channel 21 is opened on the motor rotor, it will affect the balance of the motor rotor during operation. Based on this, as an optimization of any technical solution or any optimized technical solution provided in the foregoing or later text of the present invention, the number of the flow channels 21 is 4 to 8, and the flow channels 21 are evenly opened on the main shaft 2 along the circumference of the main shaft 2.

[0038] The cooling effect of the flow channels 21 on the permanent magnet 1 and the main shaft 2 increases as the number of the flow channels 21 increases, but the number of the flow channels 21 is also affected by the size of the shaft shoulder end face. If too many flow channels 21 are opened from the shaft shoulder end face of the main shaft 2, the mechanical strength of the entire main shaft 2 will be reduced. Therefore, taking both into consideration, the number of the flow channels 21 is selected to be 4 to 8, which can meet the cooling needs of the flow channels 21 and the size strength requirements of the shaft shoulder end face.

[0039] Furthermore, in order to improve the rotational stability of the main shaft 2 during rotation and take into account the influence of the flow channel 21 on the structural strength of the rotor, as an optimization of any technical solution or any optimized technical solution provided in the foregoing or later text of the present invention, the number of the flow channels 21 is an even number, and the aperture range of the flow channels 21 is 3 to 5 mm.

[0040] As an optimization of any technical solution or any optimized technical solution provided above or below the present invention, the permanent magnet 1 includes at least one through hole 11 along the axial direction of the main shaft 2, and the through hole 11 is connected to the flow channel 21, so that the cooling medium can flow through the interior of the permanent magnet 1.

[0041] The through hole 11 opened inside the permanent magnet 1 along the axial direction of the main shaft 2, together with the flow channel 21, can guide the cooling medium outside the main shaft 2 through the flow channel 21 and flow through the through hole 11, thereby cooling the permanent magnet 1 from the inside.

[0042] The through hole 11 can be connected to the flow channel 21 indirectly through other flow channels 21 or gaps provided between the permanent magnet 1 and the main shaft 2. Specifically, the gap between the main shaft 2 and the permanent magnet 1 can be used as an intermediate structure connecting the flow channel 21 and the through hole 11, thereby further extending the flow length of the cooling medium between the main shaft 2 and the permanent magnet 1, so that the cooling medium can be more fully utilized.

[0043] In addition, by communicating the flow channel 21 of the spindle 2 through the through hole 11, a unidirectional cooling flow path can be formed inside the spindle 2, that is, the cooling medium can flow in from the flow channel 21 provided on the spindle 2 at one end of the permanent magnet 1, pass through the through hole 11 inside the permanent magnet 1, and then flow out from the flow channel 21 provided on the spindle 2 at the other end of the permanent magnet 1. The above-mentioned unidirectional cooling flow path can effectively avoid the accumulation and poor flow of the cooling medium inside the spindle 2 and the permanent magnet 1, and improve the cooling effect of the spindle 2 and the permanent magnet 1.

[0044] As an optimization of any technical solution or any optimized technical solution provided in the foregoing or later text of the present invention, the main shaft 2 includes: a first shaft segment 22, having a first shaft shoulder 221, and abutting against the first end of the permanent magnet 1; a second shaft segment 23, having a first shaft ring 231, and abutting against the second end of the permanent magnet 1; and a sleeve 24, which is sleeved on the outside of the first shaft segment 22, the permanent magnet 1 and the second shaft segment 23, and is positioned along the axial direction of the main shaft 2 through the first shaft ring 231.

[0045] The main shaft 2 formed by the first shaft section 22, the second shaft section 23 and the sleeve 24 can better realize the main shaft 2 and the fixed installation of the main shaft 2 to the permanent magnet 1. Specifically, the first shaft section 22, the second shaft section 23 and the permanent magnet 1 are first fixed along the axial direction of the main shaft 2 (for example, by bonding), and then the sleeve 24 is sleeved on the first shaft section 22, the second shaft section 23 and the outside of the permanent magnet 1 by heat sleeve, and forms an interference fit relationship with the first shaft section 22 and the second shaft section 23. In addition, the sleeve 24 is inserted by the first shaft shoulder 221 of the first shaft section 22, and is positioned along the axial direction of the main shaft 2 by the first shaft ring 231 of the second shaft section 23.

[0046] Through the above-mentioned installation and fixing method, the main shaft 2 can ensure that the relative position relationship of the components therein is fixed during the high-speed rotation of the motor rotor, thereby enhancing the integrity of the motor rotor. In addition, the first shaft segment 22, the second shaft segment 23 and the sleeve 24 are processed separately, which is conducive to improving the processing accuracy of each component and improving production efficiency. In addition, it also helps to ensure that after the first shaft segment 22, the second shaft segment 23 and the sleeve 24 are assembled, the flow channel 21 and the through hole 11 can flow smoothly along the axial direction of the main shaft 2.

[0047] Accordingly, as an optimization of any technical solution or any optimized technical solution provided in the foregoing or later text of the present invention, the flow channel 21 is opened from the end face of the first shoulder 221 perpendicular to the axis of the main shaft 2, and the end face of the first shaft ring 231 perpendicular to the axial direction of the main shaft 2 and away from the permanent magnet 1, obliquely toward the permanent magnet 1 to the axis of the main shaft 2.

[0048] The above-mentioned flow channel 21 is opened obliquely to the permanent magnet 1 to the axis of the main shaft 2, including the situation that the end of the flow channel 21 is directly opened to the axis of the main shaft 2, and also includes the situation that the extension line of the flow channel 21 is opened to the axis of the main shaft 2. The specific situation is determined according to the axial length of the main shaft 2 and the angle at which the flow channel 21 is opened.

[0049] In order to ensure a smooth surface of the assembled electrode rotor, as an optimization of any technical solution or any optimized technical solution provided above or below in the present invention, the outer diameter of the sheath 24 is consistent with the outer diameter of the first shaft ring 231 .

[0050] As an optimization of any technical solution or any optimized technical solution provided above or below in the present invention, the first shaft segment 22 and the second shaft segment 23 have the same outer diameter and are interference fit with the sleeve 24. In addition, the permanent magnet 1 and the sleeve 24 can also be interference fit to strengthen the connection strength between the main shaft 2 and the permanent magnet 1 and improve the operating reliability of the compressor motor.

[0051] In order to prevent the flow channel 21 and the through hole 11 from being misaligned, as an optimization of any technical solution or any optimized technical solution provided in the foregoing or later text of the present invention, the first shaft segment 22, the second shaft segment 23 and the permanent magnet 1 respectively have positioning grooves along the axial direction of the main shaft 2, and the positioning grooves can be inserted with guide rods, so as to position the first shaft segment 22, the second shaft segment 23 and the permanent magnet 1 along the circumferential direction of the main shaft 2.

[0052] like Figure 2 As shown, the present invention also provides a compressor, comprising: a cylinder 4; a motor stator 3, mounted on the cylinder 4; and the motor rotor as described above, rotatably mounted on the cylinder 4 and arranged inside the electrode stator, capable of rotating relative to the electrode stator under the drive of electromagnetic force.

[0053] As an optimization of any technical solution or any optimized technical solution provided in the foregoing or later text of the present invention, a spiral cooling channel 5 extending axially along the main shaft 2 is provided between the motor stator 3 and the cylinder 4, and a gap channel 6 is provided between the motor stator 3 and the motor rotor; the refrigerant of the compressor can flow through the spiral cooling channel 5, the gap channel 6, the flow channel 21 of the main shaft 2 and the through hole 11 in the permanent magnet 1, thereby cooling the motor stator 3 and the motor rotor.

[0054] Through the spiral cooling channel 5 and the gap channel 6, the inner and outer surfaces of the motor stator 3 can be evenly contacted with the cooling medium and fully dissipate heat, so that the motor stator 3 is maintained in a good temperature range. In addition, the gap channel 6 can also cool the outside of the motor rotor, and in combination with the internal cooling channel 21 of the electrode rotor formed by the channel 21 and the through hole 11, the electrode rotor can also obtain good heat dissipation from the inner and outer surfaces respectively.

[0055] As an optimization of any technical solution or any optimized technical solution provided in the foregoing or later text of the present invention, the compressor includes: a refrigerant inlet 7, which is opened at one end of the cylinder 4 and is used to introduce the refrigerant into the spiral cooling channel 5; and a refrigerant outlet 8, which is opened in the cylinder 4 and is at the same end of the cylinder 4 as the refrigerant inlet 7, and can guide the refrigerant after cooling the motor stator 3 and the motor rotor out of the compressor.

[0056] Combination Figure 2 , and based on the above-mentioned settings of the refrigerant inlet 7 and the refrigerant outlet 8, in the cooling circulation system in the compressor, the liquid low-temperature cooling medium enters from the refrigerant inlet 7, and stays in the spiral cooling channel 5 between the cylinder 4 and the motor stator 3, and takes away the heat from the inner surface of the cylinder 4 and the outer surface of the stator; the cooling medium is vaporized after fully absorbing heat in the spiral cooling channel 5, and flows out from the outlet of the spiral cooling channel 5 in the form of gas, and gathers in the cavity formed by the first shaft segment 22 and the cylinder 4; with the accumulation of gaseous cooling medium in the cavity, the pressure gradually increases , a part of the gaseous cooling medium located in the first shaft segment 22 flows through the gap between the motor stator 3 and the motor rotor, and the other part flows from the flow channel 21 opened in the first shaft segment 22 to the through hole 11 inside the permanent magnet 1, and after sufficient heat exchange in the through hole 11, it flows out from the flow channel 21 opened in the second shaft segment 23; at this time, both parts of the gaseous cooling medium are guided to the cavity between the second main shaft 2 and the cylinder 4, and flow out of the compressor through the refrigerant outlet 8 opened in the cylinder 4, and take away the heat absorbed during the flow process.

[0057] Based on the above technical solution, the embodiment of the present invention opens a flow channel 21 connected to the permanent magnet 1 on the main shaft 2, so that the permanent magnet 1 can be cooled by the cooling medium outside the main shaft 2, thereby improving the heat dissipation effect of the main shaft 2 and the permanent magnet 1.

[0058] In addition, the flow channel 21 of the main shaft 2 and the through hole 11 of the permanent magnet 1 are added to the entire heat dissipation cycle in the compressor, so that the cooling medium can continuously take away the heat of the motor rotor and maintain the motor rotor in a reasonable temperature range.

[0059] Unless otherwise stated, any technical solution disclosed in the present invention disclosed above, if it discloses a numerical range, then the disclosed numerical range is a preferred numerical range, and any technician in the field should understand that the preferred numerical range is only a numerical value with a more obvious technical effect or representative value among many implementable numerical values. Since there are too many numerical values ​​to be exhaustive, the present invention discloses some numerical values ​​to illustrate the technical solution of the present invention, and the numerical values ​​listed above should not constitute a limitation on the scope of protection of the present invention.

[0060] If the words "first", "second" and so on are used in this article to limit components, those skilled in the art should know that the use of "first" and "second" is only for the convenience of description to distinguish the components. Unless otherwise stated, the above words have no special meaning.

[0061] At the same time, if the above-mentioned invention discloses or involves components or structural parts that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connected by bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (for example, manufactured by one-piece molding using a casting process) (except when it is obviously impossible to use an one-piece molding process).

[0062] In addition, the terms used in any technical solution disclosed in the present invention to indicate positional relationships or shapes include states or shapes that are similar, similar or close to them unless otherwise stated. Any component provided by the present invention may be assembled from multiple separate components or may be a separate component manufactured by an integrated molding process.

[0063] If the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are used in the description of the present invention, the orientation or position relationship indicated by the above terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the referred device, mechanism, component or element must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A motor rotor, characterized in that: include: permanent magnet; as well as A main shaft, arranged outside the permanent magnet, used to carry the permanent magnet and make the permanent magnet rotate around the rotating shaft of the motor rotor; Among them, the main shaft is provided with a flow channel, and the two ends of the flow channel are respectively connected to the permanent magnet and the outside of the main shaft, so that the cooling medium outside the main shaft can be conducted to the permanent magnet through the flow channel; the permanent magnet includes at least one through hole along the axial direction of the main shaft, and the through hole is connected with the flow channel, so that the cooling medium can flow through the interior of the permanent magnet.

2. The motor rotor according to claim 1, characterized in that: The main shaft has a shaft shoulder, and the flow channel is opened from the end surface of the shaft shoulder which is perpendicular to the main shaft axis and obliquely toward the permanent magnet to the axis of the main shaft.

3. The motor rotor according to claim 2, characterized in that: The number of the flow channels is 4 to 8, and the flow channels are evenly opened on the main shaft along the circumference of the main shaft.

4. The motor rotor according to claim 3, characterized in that: The number of the flow channels is an even number, and the aperture of the flow channels ranges from 3 to 5 mm.

5. The motor rotor according to claim 1, characterized in that: The main axis comprises: A first shaft segment having a first shaft shoulder and abutting against a first end of the permanent magnet; a second shaft segment having a first shaft ring and abutting against the second end of the permanent magnet; and The sheath is sleeved on the outside of the first shaft segment, the permanent magnet and the second shaft segment, and is positioned along the axial direction of the main shaft through the first shaft ring.

6. The motor rotor according to claim 5, characterized in that: The flow channel is respectively opened from the end surface of the first shoulder perpendicular to the main shaft axis and the end surface of the first collar perpendicular to the main shaft axis and away from the permanent magnet, obliquely toward the permanent magnet to the main shaft axis.

7. The motor rotor according to claim 5, characterized in that: The outer diameter of the sheath is consistent with the outer diameter of the first collar.

8. The motor rotor according to claim 5, characterized in that: The first shaft section and the second shaft section have the same outer diameter and are interference fit with the sleeve.

9. The motor rotor according to claim 5, characterized in that: The first shaft segment, the second shaft segment and the permanent magnet respectively have positioning grooves along the axial direction of the main shaft, and the positioning grooves can be inserted with guide rods to position the first shaft segment, the second shaft segment and the permanent magnet along the circumferential direction of the main shaft.

10. A compressor, characterized in that: include: Cylinder; A motor stator is mounted on the cylinder; as well as The motor rotor, as described in any one of claims 5 to 9, is rotatably mounted on the cylinder and arranged inside the motor stator, and can rotate relative to the motor stator under the drive of electromagnetic force.

11. The compressor according to claim 10, characterized in that A spiral cooling channel extending along the axial direction of the main shaft is provided between the motor stator and the barrel, and a gap channel is provided between the motor stator and the motor rotor; The refrigerant of the compressor can flow through the spiral cooling channel, the gap channel, the flow channel of the main shaft and the through hole in the permanent magnet, so as to cool the motor stator and the motor rotor.

12. The compressor according to claim 11, characterized in that The compressor comprises: A refrigerant inlet is provided at one end of the cylinder and is used to introduce refrigerant into the spiral cooling channel; and The refrigerant outlet is opened in the cylinder and is located at the same end of the cylinder as the refrigerant inlet, and can guide the refrigerant after cooling the motor stator and the motor rotor out of the compressor.

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