Motor rotor and compressor

Abstract

The application provides a motor rotor and a compressor, wherein the motor rotor comprises a rotor core, a rotor shaft hole, a rotor skew slot and at least one refrigerant through hole are arranged on the rotor core, the rotor shaft hole, the rotor skew slot and the refrigerant through hole all penetrate through opposite ends of the rotor core, the rotor shaft hole is located at an axis position of the rotor core, the refrigerant through hole is located between the rotor skew slot and the rotor shaft hole, the rotor skew slot and the refrigerant through hole are both in a skew shape, and the skew directions of the rotor skew slot and the refrigerant through hole are opposite. In the motor rotor and the compressor provided by the application, the rotor skew slot and the refrigerant through hole are arranged in a skew shape, and the skew directions of the rotor skew slot and the refrigerant through hole are opposite, so that the stability of a compressor pump body is improved, and the energy efficiency of the compressor is improved.

Description

Technical Field

[0001] This application relates to the field of compressor technology, and in particular to an electric motor rotor and a compressor. Background Technology

[0002] A compressor is a driven fluid machine that raises low-pressure gas to high-pressure gas. It is the heart of a refrigeration system. It draws in low-temperature, low-pressure refrigerant gas through the suction pipe, and uses the motor to drive the piston to compress the low-temperature, low-pressure refrigerant gas, and then discharges high-temperature, high-pressure refrigerant gas through the discharge pipe, thereby providing power for the refrigeration cycle.

[0003] Existing compressors generally include a housing, a motor assembly, and a pump assembly. The motor assembly and the pump assembly are driven together and are both housed within the housing. The motor assembly includes a stator and a rotor, with the rotor fixed to the stator via a shaft.

[0004] To reduce the additional torque and electromagnetic noise caused by the tooth harmonic magnetic field and to improve the stability of the pump body, rotary compressor motor rotors are generally equipped with rotor skew slots. Simultaneously, to reduce oil yield, the motor rotor also has a refrigerant through-hole near the shaft, the refrigerant through-hole being aligned with the skew direction of the rotor skew slots.

[0005] However, in actual use, it was found that the compressor pump body was not stable enough and was prone to abnormal noises. Summary of the Invention

[0006] In view of the deficiencies in the prior art, the purpose of this invention is to provide a motor rotor and a compressor that overcome the difficulties of the prior art and improve the energy efficiency of the compressor while improving the stability of the pump body.

[0007] According to one aspect of the present invention, an electric motor rotor is provided, the electric motor rotor comprising: a rotor core;

[0008] The rotor core has a rotor shaft hole, a rotor slot and at least one refrigerant through hole. The rotor shaft hole, rotor slot and refrigerant through hole all pass through the opposite ends of the rotor core. The rotor shaft hole is located on the axis of the rotor core and the refrigerant through hole is located between the rotor slot and the rotor shaft hole.

[0009] The rotor groove and the refrigerant through hole are both twisted, and the twisting directions of the rotor groove and the refrigerant through hole are opposite.

[0010] Optionally, in the motor rotor, the rotation direction of the rotor slot is opposite to the rotation direction of the rotor core, and the rotation direction of the refrigerant through hole is the same as the rotation direction of the rotor core.

[0011] Optionally, in the motor rotor, at least two refrigerant through holes are provided on the rotor core, and the at least two refrigerant through holes are evenly distributed along the circumference of the rotor core.

[0012] Optionally, in the motor rotor, the rotor core is formed by stacking multiple rotor laminations from top to bottom.

[0013] Optionally, in the motor rotor, the skew angle between any adjacent rotor laminations is the same.

[0014] Optionally, the motor rotor also includes guide bars, which are disposed within the rotor's inclined slots.

[0015] Optionally, the motor rotor further includes: a first end ring and a second end ring;

[0016] The first end ring and the second end ring are respectively disposed on the two end faces of the rotor core.

[0017] According to another aspect of the invention, a compressor is provided, the compressor comprising a motor rotor as described above.

[0018] In the motor rotor and compressor provided by the present invention, by setting the rotor slant slot and the refrigerant through hole in a twisted shape, and making the twisting directions of the rotor slant slot and the refrigerant through hole opposite, the stability of the compressor pump body is improved and the energy efficiency of the compressor is improved. Attached Figure Description

[0019] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, so that the characteristics and advantages of the present invention will become more apparent.

[0020] Figure 1 This is a cross-sectional view of the motor rotor according to an embodiment of the present invention;

[0021] Figure 2 This is a top view of the motor rotor according to an embodiment of the present invention. Detailed Implementation

[0022] The embodiments of the present invention will be described in detail below. Although the present invention will be described and illustrated in conjunction with some specific embodiments, it should be noted that the present invention is not limited to these embodiments. On the contrary, any modifications or equivalent substitutions made to the present invention should be covered within the scope of the claims of the present invention.

[0023] Furthermore, to better illustrate the present invention, numerous specific details are set forth in the following detailed embodiments. Those skilled in the art will understand that the present invention can be practiced without these specific details. In other instances, well-known structures and components have not been described in detail in order to highlight the main points of the invention.

[0024] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, so that the characteristics and advantages of the present invention will become more apparent.

[0025] Please refer to the reference. Figure 1 and Figure 2 This is a schematic diagram of the motor rotor structure according to an embodiment of the present invention. Figure 1 and Figure 2 As shown, the motor rotor 10 includes: a rotor core 1; the rotor core 1 has a rotor shaft hole 2, a rotor slot 3 and at least one refrigerant through hole 4, the rotor shaft hole 2, the rotor slot 3 and the refrigerant through hole 4 all pass through the opposite ends of the rotor core 1, the rotor shaft hole 2 is located on the axis of the rotor core 1, and the refrigerant through hole 4 is located between the rotor shaft hole 2 and the rotor slot 3; wherein, the rotor slot 3 and the refrigerant through hole 4 are both twisted, and the twisting directions of the rotor slot 3 and the refrigerant through hole 4 are opposite.

[0026] Specifically, a rotor shaft hole 2 is provided at the axial position (i.e., the center position) of the rotor core 1, which is used to fix it to the motor shaft. A rotor groove 3 is provided at the edge of the rotor core 1, which can reduce the additional torque and electromagnetic noise caused by the tooth harmonic magnetic field. At least one refrigerant through hole 4 is provided between the rotor shaft hole 2 and the rotor groove 3, extending along the axial direction of the rotor core 1 and penetrating both opposite ends of the rotor core 1. The refrigerant through hole 4 allows the refrigerant compressed by the compressor cylinder to pass through the motor rotor 10, thereby reducing the oil output rate.

[0027] like Figure 1 and Figure 2 As shown, the rotor shaft hole 2 is a straight groove, and the center line of the rotor shaft hole 2 coincides with the center axis of the rotor core 1. The rotor inclined groove 3 and the refrigerant through hole 4 are both inclined spiral grooves. The twisting direction of the rotor inclined groove 3 is opposite to the twisting direction of the refrigerant through hole 4.

[0028] Specifically, the rotation direction of the rotor slot 3 is required to be opposite to the rotation direction of the rotor core 1. Correspondingly, the rotation direction of the refrigerant through-hole 4 is the same as the rotation direction of the rotor core 1. That is, viewed from top to bottom, if the rotor core 1 rotates counterclockwise, then the rotor slot 3 rotates clockwise from top to bottom, and the refrigerant through-hole 4 rotates counterclockwise from top to bottom. Conversely, viewed from top to bottom, if the rotor core 1 rotates clockwise, then the rotor slot 3 rotates counterclockwise from top to bottom, and the refrigerant through-hole 4 rotates clockwise from top to bottom.

[0029] In this embodiment, the rotor core 1 is formed by stacking multiple rotor laminations (not shown in the figure) from top to bottom. Each rotor lamination is provided with a first through hole and a second through hole. The first through hole corresponds to the rotor inclined slot 3. The twist angle of the rotor inclined slot 3 is equal to the sum of the twist angles of each rotor lamination. The second through hole corresponds to the refrigerant through hole 4. The twist angle of the refrigerant through hole 4 is equal to the sum of the twist angles of each rotor lamination.

[0030] Preferably, the skew angle between any two adjacent rotor laminations is the same. If the rotor core 1 is formed by stacking N rotor laminations, and the skew angle between any two adjacent rotor laminations of the rotor slot 3 is α, and the skew angle between any two adjacent rotor laminations of the refrigerant through hole 4 is β, then the overall skew angle of the rotor slot 3 is equal to N×α, and the overall skew angle of the refrigerant through hole 4 is equal to N×β.

[0031] In this embodiment, a refrigerant through hole 4 is provided between the rotor shaft hole 2 and the rotor inclined slot 3. In other embodiments, two, three, or more refrigerant through holes 4 may be provided between the rotor shaft hole 2 and the rotor inclined slot 3. Preferably, at least two refrigerant through holes 4 are provided on the rotor core 1, and the at least two refrigerant through holes 4 are evenly distributed along the circumference of the rotor core 1.

[0032] Please continue to refer to this. Figure 1 The motor rotor 10 also includes a guide bar (not shown in the figure), a first end ring 5 and a second end ring 6. The guide bar is disposed in the rotor inclined groove 3, and the first end ring 5 and the second end ring 6 are respectively disposed on the two end faces of the rotor core 1.

[0033] Accordingly, this embodiment also provides a compressor, which includes: a housing, a motor assembly and a pump assembly, wherein the motor assembly and the pump assembly are drivenly connected and are both disposed within the housing; wherein the motor assembly includes a stator and a motor rotor 10 as described above, and the motor rotor 10 is fixed in the stator by a rotating shaft.

[0034] The applicant's research found that in the existing motor rotor, the refrigerant through hole and the rotor skew slot are in the same skew direction. Therefore, when the compressor is running, the high-temperature and high-pressure refrigerant gas discharged from the pump body assembly will be subjected to a downward force when passing through the refrigerant through hole of the motor rotor, which increases the flow resistance, causing the compressor power to increase and the energy efficiency to decrease. The reaction force will offset the downward pull of the motor on the rotor during operation, affecting the stability of the pump body, and thus causing abnormal noise.

[0035] Based on this, the applicant reversed the twisting direction of the refrigerant through hole and the rotor skew slot to reduce the flow resistance of the pump body assembly exhaust, improve the energy efficiency of the compressor, and at the same time reduce the axial force on the motor rotor, thereby improving the axial stability of the pump body assembly.

[0036] The motor rotor 10 provided by this invention has been tested on a compressor of a certain specification. The compressor of this specification using the motor rotor 10 is the compressor of the embodiment, and the compressor of this specification using a conventional motor rotor is the compressor of the comparative example. The unit performance of the compressor provided in this embodiment is compared with the unit performance of the compressor of the comparative example as follows:

[0037]

[0038] As shown in the table above, after adopting the motor rotor 10 provided by this invention, the compressor of this specification has a lower input power and a higher overall COP under various test conditions compared with other compressors of the same specification that use existing motor rotors.

[0039] In summary, the motor rotor and compressor of the present invention improve the stability of the compressor pump body and improve the energy efficiency of the compressor by setting the rotor slant slot and the refrigerant through hole in a twisted shape, and making the twisting direction of the rotor slant slot and the refrigerant through hole opposite.

[0040] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of this application and should not be construed as limiting the specific implementation of this application to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of this application, and all such modifications or substitutions should be considered within the scope of protection of this application.

Claims

1. An electric machine rotor, characterized in that, The motor rotor comprises: a rotor core; a rotor shaft hole, a rotor skew slot and at least one refrigerant through hole are formed in the rotor core, the rotor shaft hole, the rotor skew slot and the refrigerant through hole all penetrate through opposite ends of the rotor core, the rotor shaft hole is located at an axis position of the rotor core, and the refrigerant through hole is located between the rotor skew slot and the rotor shaft hole; wherein the rotor skew slot and the refrigerant through hole are both in a skew shape, and skew directions of the rotor skew slot and the refrigerant through hole are opposite; a rotation direction of the rotor skew slot is opposite to a rotation direction of the rotor core, and a rotation direction of the refrigerant through hole is the same as the rotation direction of the rotor core; the motor rotor further comprises a bar, and the bar is arranged in the rotor skew slot.

2. The motor rotor of claim 1, wherein, At least two refrigerant through holes are formed in the rotor core, and the at least two refrigerant through holes are uniformly distributed along a circumferential direction of the rotor core.

3. The motor rotor of claim 1, wherein The rotor core is formed by stacking a plurality of rotor laminations from top to bottom.

4. The motor rotor of claim 3, wherein Skew angles between any adjacent rotor laminations are the same.

5. The motor rotor of claim 1, wherein Further comprising: a first end ring and a second end ring; the first end ring and the second end ring are arranged on two end faces of the rotor core respectively.

6. A compressor characterized by, The motor rotor comprises: the motor rotor as claimed in any one of claims 1 to 5.

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