Liquid cooling motor rotor cooling structure for compressor

Abstract

The utility model discloses a liquid cooling motor rotor cooling structure for a compressor, which belongs to the technical field of motor cooling and comprises a motor main body and a cooling assembly, and the cooling assembly used for cooling is mounted on the inner side of the motor main body. The motor main body comprises a motor base, a motor stator, a motor rotor, a motor front cover and a motor rear cover, the motor stator is fixedly pressed on the inner side of the motor base, and the motor rotor sleeves a projecting shaft of the compressor; the cooling assembly comprises a cooling pipe, one end of the cooling pipe is fixedly installed on the inner side wall of the motor base in a communicated mode, the other end of the cooling pipe is bent to face the inner side wall of the motor rotor, and liquid spraying holes are formed in the end, facing the motor rotor, of the cooling pipe. Through the mode, the motor rotor can be directly sprayed by cooling oil in the operation process through the arrangement of the cooling pipe and the liquid spraying holes, and the temperature of the motor rotor is remarkably reduced, so that the risk that the motor rotor is demagnetized due to high temperature is reduced.

Description

Technical Field

[0001] This utility model relates to the field of motor cooling technology, specifically to a liquid-cooled motor rotor cooling structure for compressors. Background Technology

[0002] Permanent magnet synchronous motors have the characteristics of small size, high overall operating efficiency, high power factor, large starting torque, good power performance, and low temperature rise. However, since permanent magnet motors use magnets for excitation, it is necessary to control the temperature of the magnets to avoid demagnetization caused by long-term high-temperature operation. Existing liquid-cooled permanent magnet synchronous motors generally use indirect cooling of the stator to cool the motor.

[0003] For example, Chinese patent application CN117767662A discloses a stator cooling structure and a motor. The stator cooling structure includes a housing and a stator core. The inner side wall of the housing is provided with a first cooling channel, and the outer side wall of the housing is provided with an oil inlet communicating with the first cooling channel. The stator core is installed in the housing and the stator core is provided with at least one second cooling channel. The two ends of each second cooling channel extend to the two ends of the stator core, and the second cooling channels are spaced apart along the circumferential direction of the stator core and are all communicating with the first cooling channel.

[0004] However, the stator cooling structure and the lack of cooling for the motor rotor during use make it difficult for the heat of the motor rotor to dissipate. Long-term high-temperature working environment can easily cause demagnetization of the permanent magnets.

[0005] Based on this, the present invention designs a liquid-cooled motor rotor cooling structure for compressors to solve the above problems. Utility Model Content

[0006] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a liquid-cooled motor rotor cooling structure for compressors.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A liquid-cooled motor rotor cooling structure for a compressor includes a motor body and a cooling assembly.

[0009] A cooling component for cooling and temperature reduction is installed inside the motor body;

[0010] The motor body includes a motor base, a motor stator, a motor rotor, a motor front cover, and a motor rear cover. The motor stator is fixedly press-fitted into the inner side of the motor base, the motor rotor is sleeved on the compressor extension shaft, and the motor rear cover and motor front cover are fixedly installed at the upper and lower ends of the motor base. The inner side of the motor base is connected to the cooling assembly.

[0011] The cooling assembly includes a cooling pipe, one end of which is connected to and fixedly installed on the inner wall of the motor base, and the other end of which is bent toward the inner wall of the motor rotor. A spray hole is provided on the end of the cooling pipe facing the motor rotor.

[0012] Furthermore, the motor base sidewall has a radially provided channel to connect the cooling pipe to the outside of the motor base.

[0013] Furthermore, the inner side of the motor rotor has multiple channels along the axial direction for discharging cooling oil.

[0014] Furthermore, a liquid return assembly is also installed at the lower end of the motor base, and the liquid return assembly is connected to the motor rotor.

[0015] Furthermore, the liquid return assembly includes a reflux seat and a first sealing ring. The lower part of the reflux seat is disc-shaped, and the upper part is cylindrical. A through hole is provided in the middle of the reflux seat for the compressor extension shaft to pass through. The upper end of the lower part of the reflux seat is fixedly connected to the motor base, and the upper part of the reflux seat is rotatably connected to the motor rotor. The first sealing ring is fixedly installed on the upper end of the reflux seat and is rotatably sealed to the motor rotor. A liquid storage tank is provided on the upper part of the reflux seat. The liquid storage tank is an annular deep groove and is located below the channel of the motor rotor. A liquid outlet channel is provided on the lower part of the reflux seat. One end of the liquid outlet channel is connected to the liquid storage tank, and the other end of the liquid outlet channel is connected to the outside of the reflux seat.

[0016] Furthermore, a filter assembly is also installed on the outside of the motor base, and the filter assembly is connected to the rear cover of the motor.

[0017] Furthermore, the filter assembly includes a filter housing, a filter top cover, a filter screen, a second sealing ring, and two limiting seats. The filter housing is fixedly installed on the outside of the motor base channel and is in contact with the motor rear cover. The filter housing has an oil outlet corresponding to the channel of the motor base and an oil inlet on the outside of the filter housing. The filter top cover is fixedly installed on the upper end of the filter housing. Two limiting seats are fixedly installed on the inner side wall of the filter housing. The inner side of the two limiting seats has a sliding groove for use with the filter screen. The second sealing ring is sleeved on the outside of the filter screen frame. The filter screen frame is sealed and abutted against the filter housing and the filter top cover through the second sealing ring. The filter screen frame is also sealed and slidably connected to the limiting seats through the second sealing ring.

[0018] Furthermore, the filter housing and the filter top cover are fixedly connected by bolts, and the filter screen separates the oil inlet and oil outlet of the filter housing on both sides.

[0019] Compared with the prior art, the advantages of this utility model are as follows: 1. By setting up cooling pipes and spray holes, the motor rotor can be directly sprayed with cooling oil during operation, which significantly reduces the temperature of the motor rotor and thus reduces the risk of demagnetization of the motor rotor due to high temperature.

[0020] 2. The channel design between the motor base and the motor rotor allows for rapid entry and exit of cooling oil, facilitating the quick removal of heat by the cooling oil and improving the cooling effect.

[0021] 3. The filter screen prevents impurities in the cooling oil from accumulating inside the motor rotor and reducing its performance. The filter housing and top cover facilitate regular cleaning and replacement of the filter screen. The filter housing also allows for easy drainage of used cooling oil. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This utility model discloses a three-dimensional cooling structure for a liquid-cooled motor rotor in a compressor. Figure 1 ;

[0024] Figure 2 This is a front view of a liquid-cooled motor rotor cooling structure for a compressor according to this utility model;

[0025] Figure 3 This is a top view of a liquid-cooled motor rotor cooling structure for a compressor according to this utility model;

[0026] Figure 4 For along Figure 3 AA with a portion removed from the solid Figure 1 ;

[0027] Figure 5 For along Figure 3 BB with part of its three-dimensional structure removed Figure 1 ;

[0028] Figure 6 This utility model discloses a three-dimensional cooling structure for a liquid-cooled motor rotor in a compressor. Figure 2 ;

[0029] Figure 7 For along Figure 3 AA with a portion removed from the solid Figure 2 ;

[0030] Figure 8 for Figure 7 Enlarged view of point C in the middle;

[0031] Figure 9 For along Figure 3 BB with part of its three-dimensional structure removed Figure 2 ;

[0032] Figure 10 for Figure 9 Enlarged view of point D in the middle.

[0033] The labels in the diagram represent:

[0034] 1. Motor body; 11. Motor frame; 12. Motor stator; 13. Motor rotor; 14. Motor front cover; 15. Motor rear cover; 2. Cooling assembly; 21. Cooling pipe; 22. Spray nozzle; 3. Liquid return assembly; 31. Reflux seat; 32. First sealing ring; 33. Liquid storage tank; 34. Liquid outlet channel; 4. Filter assembly; 41. Filter housing; 42. Filter top cover; 43. Filter screen; 44. Second sealing ring; 45. Limiting seat. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0036] The terms "left," "right," "front," "back," "up," and "down" used in the following description refer to the orientation from the perspective of the front view.

[0037] Example 1: In some embodiments, please refer to the accompanying drawings. Figures 1-10 A liquid-cooled motor rotor cooling structure for a compressor includes a motor body 1 and a cooling component 2.

[0038] A cooling component 2 for cooling is installed inside the motor body 1;

[0039] The motor body 1 includes a motor base 11, a motor stator 12, a motor rotor 13, a motor front cover 14, and a motor rear cover 15. The motor stator 12 is fixedly press-fitted into the inner side of the motor base 11. The motor rotor 13 is sleeved on the compressor extension shaft. The motor rear cover 15 and the motor front cover 14 are fixedly installed at the upper and lower ends of the motor base 11. The inner side of the motor base 11 is connected to the cooling assembly 2.

[0040] The cooling assembly 2 includes a cooling pipe 21. One end of the cooling pipe 21 is connected to and fixedly installed on the inner wall of the motor base 11. The other end of the cooling pipe 21 is bent toward the inner wall of the motor rotor 13. A spray hole 22 is opened on the end of the cooling pipe 21 toward the motor rotor 13.

[0041] When the liquid-cooled motor rotor cooling structure of the compressor is in normal use, the motor rotor 13 drives the compressor extension shaft to rotate under the action of the motor stator 12. Cooling oil is transported from the cooling pipe 21 and sprayed onto the inner wall of the rotating motor rotor 13 through the spray hole 22. The cooling oil cools the motor rotor 13. Through the setting of the cooling pipe 21 and the spray hole 22, the motor rotor 13 can be directly sprayed with cooling oil during operation, which significantly reduces the temperature of the motor rotor 13, thereby reducing the risk of demagnetization of the motor rotor 13 due to high temperature.

[0042] Example 2: In some embodiments, such as Figure 4 and Figure 5 As shown, in a preferred embodiment of the present invention, the side wall of the motor base 11 is provided with a channel along the radial direction so that the cooling pipe 21 is connected to the outside of the motor base 11.

[0043] The inner side of the motor rotor 13 has multiple channels along the axial direction for discharging cooling oil.

[0044] When the liquid-cooled motor rotor cooling structure of the compressor is in normal use, the cooling oil enters the cooling pipe 21 from the channel of the motor base 11, and then is sprayed onto the inner wall of the motor rotor 13 from the spray hole 22 for cooling. After use, the cooling oil flows out from the channel of the motor rotor 13. The channel setting of the motor base 11 and the motor rotor 13 allows the cooling oil to enter and exit quickly, which facilitates the cooling oil to quickly carry away the heat and improve the cooling effect.

[0045] Example 3: In some embodiments, such as Figures 1-10 As shown, in a preferred embodiment of the present invention, a liquid return assembly 3 is also installed at the lower end of the motor base 11, and the liquid return assembly 3 is connected to the motor rotor 13.

[0046] The liquid return assembly 3 includes a reflux seat 31 and a first sealing ring 32. The lower part of the reflux seat 31 is disc-shaped, and the upper part of the reflux seat 31 is cylindrical. A through hole is provided in the middle of the reflux seat 31 for the compressor extension shaft to pass through. The upper end of the lower part of the reflux seat 31 is fixedly connected to the motor base 11, and the upper part of the reflux seat 31 is rotatably connected to the motor rotor 13. The first sealing ring 32 is fixedly installed on the upper end of the reflux seat 31 and is rotatably connected to the motor rotor 13. A liquid storage tank 33 is provided on the upper part of the reflux seat 31. The liquid storage tank 33 is an annular deep groove and is located below the channel of the motor rotor 13. A liquid outlet channel 34 is provided on the lower part of the reflux seat 31. One end of the liquid outlet channel 34 is connected to the liquid storage tank 33, and the other end of the liquid outlet channel 34 is connected to the outside of the reflux seat 31.

[0047] A filter assembly 4 is also installed on the outside of the motor base 11, and the filter assembly 4 is connected to the motor rear cover 15.

[0048] The filter assembly 4 includes a filter housing 41, a filter top cover 42, a filter screen 43, a second sealing ring 44, and two limiting seats 45. The filter housing 41 is fixedly installed on the outside of the channel of the motor base 11. The filter housing 41 is in contact with the motor rear cover 15. The filter housing 41 has an oil outlet corresponding to the channel of the motor base 11, and an oil inlet is opened on the outside of the filter housing 41. The filter top cover 42 is fixedly installed on the upper end of the filter housing 41. Two limiting seats 45 are fixedly installed on the inner side wall of the filter housing 41. The inner side of the two limiting seats 45 has a sliding groove for use with the filter screen 43. The second sealing ring 44 is sleeved on the outside of the frame of the filter screen 43. The frame of the filter screen 43 is sealed and abutted to the filter housing 41 and the filter top cover 42 through the second sealing ring 44. The frame of the filter screen 43 is sealed and slidably connected to the limiting seats 45 through the second sealing ring 44.

[0049] The filter housing 41 and the filter top cover 42 are fixedly connected by bolts, and the filter screen 43 separates the oil inlet and oil outlet of the filter housing 41 on both sides.

[0050] When the liquid-cooled motor rotor cooling structure of this compressor is in normal use, the cooling oil enters from the oil inlet of the filter housing 41, flows through the filter screen 43 for filtration, and the filtered cooling oil enters the channel of the motor base 11 from the oil outlet of the filter housing 41. After the cooling oil cools the motor rotor 13, it flows from the channel of the motor rotor 13 into the liquid storage tank 33 on the upper part of the return seat 31, and then is discharged from the liquid storage tank 33 through the liquid outlet channel 34. The first sealing ring 32 ensures the sealing effect between the motor rotor 13 and the return seat 31. The filter screen 43 prevents impurities in the cooling oil from entering the inner side of the motor rotor 13 and accumulating, thereby reducing the performance of the motor rotor 13. The filter housing 41 and the filter top cover 42 facilitate the periodic cleaning and replacement of the filter screen 43. The filter housing 41 also allows for convenient discharge of the used cooling oil.

[0051] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A liquid-cooled motor rotor cooling structure for a compressor, comprising a motor main body (1), characterized by: Also include cooling components (2), the motor body (1) inside installation is used for cooling cooling cooling components (2); The motor body (1) includes a motor base (11), a motor stator (12), a motor rotor (13), a motor front cover (14) and a motor rear cover (15), the motor stator (12) is fixedly pressed into the inside of the motor base (11), the motor rotor (13) is sleeved on the compressor extension shaft, the motor rear cover (15) and the motor front cover (14) are fixedly installed on the upper and lower ends of the motor base (11), and the inside of the motor base (11) is connected with the cooling component (2); The cooling component (2) includes a cooling pipe (21), one end of the cooling pipe (21) is communicated and fixedly installed on the inner wall of the motor base (11), the other end of the cooling pipe (21) is bent towards the inner wall of the motor rotor (13), and a liquid injection hole (22) is formed in the end of the cooling pipe (21) towards the motor rotor (13).

2. The liquid-cooled motor rotor cooling structure for a compressor according to claim 1, characterized by The side wall of the motor base (11) is provided with a channel along the radial direction to communicate the cooling pipe (21) with the outside of the motor base (11).

3. The liquid-cooled motor rotor cooling structure for a compressor according to claim 1, characterized by The inside of the motor rotor (13) is provided with a plurality of channels along the axial direction for discharging cooling oil.

4. The liquid-cooled motor rotor cooling structure for a compressor according to claim 2, characterized by The lower end of the motor base (11) is also provided with a liquid return component (3), and the liquid return component (3) is connected with the motor rotor (13).

5. The liquid-cooled motor rotor cooling structure for a compressor according to claim 4, characterized by The liquid return component (3) includes a return seat (31) and a first sealing ring (32), the lower part of the return seat (31) is disc-shaped, the upper part of the return seat (31) is cylindrical, a through hole is formed in the middle of the return seat (31) for the compressor extension shaft to pass through, the upper end of the lower part of the return seat (31) is fixedly connected with the motor base (11), the upper part of the return seat (31) is rotatably connected with the motor rotor (13), the first sealing ring (32) is fixedly installed on the upper end of the return seat (31) and is sealingly rotatably connected with the motor rotor (13), a liquid storage groove (33) is formed in the upper part of the return seat (31), the liquid storage groove (33) is an annular deep groove, the liquid storage groove (33) is located below the channel of the motor rotor (13), a liquid outlet channel (34) is formed in the lower part of the return seat (31), one end of the liquid outlet channel (34) is communicated with the liquid storage groove (33), and the other end of the liquid outlet channel (34) is communicated with the outside of the return seat (31).

6. The liquid-cooled motor rotor cooling structure for a compressor according to claim 3, characterized by The outside of the motor base (11) is also provided with a filter component (4), and the filter component (4) is connected with the motor rear cover (15).

7. The liquid-cooled motor rotor cooling structure for a compressor according to claim 6, characterized by The filter assembly (4) comprises a filter shell (41), a filter top cover (42), a filter screen (43), a second sealing ring (44) and two limiting seats (45), the filter shell (41) is fixedly installed outside the passage of the motor base (11), the filter shell (41) is in contact connection with the motor rear cover (15), the filter shell (41) is provided with an oil outlet corresponding to the passage of the motor base (11), the filter shell (41) is provided with an oil inlet outside, the filter top cover (42) is fixedly installed on the upper end of the filter shell (41), two limiting seats (45) are fixedly installed on the inner side wall of the filter shell (41), the inner side of the two limiting seats (45) is provided with a sliding groove matched with the filter screen (43), the second sealing ring (44) is sleeved outside the frame of the filter screen (43), the frame of the filter screen (43) is in sealing abutting connection with the filter shell (41) and the filter top cover (42) through the second sealing ring (44), and the frame of the filter screen (43) is in sealing sliding connection with the limiting seat (45) through the second sealing ring (44).

8. The liquid-cooled motor rotor cooling structure for a compressor according to claim 7, characterized by The filter shell (41) and the filter top cover (42) are fixedly connected through bolts, and the filter screen (43) separates the oil inlet and the oil outlet of the filter shell (41) on both sides.

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