Internal circulation heat dissipation structure and motor

Abstract

The present application provides an internal circulation heat dissipation structure and a motor. The internal circulation heat dissipation structure comprises a motor barrel (1), the motor barrel (1) is provided with at least two liquid flow channels (17) extending in the axial direction, the motor barrel (1) between two adjacent liquid flow channels (17) is provided with an external gas flow channel (2) penetrating in the axial direction, an internal gas flow channel (21) is formed on the inner circumference of the motor barrel (1), and the internal gas flow channel (21) and the external gas flow channel (2) are connected to form an internal circulation air duct. According to the internal circulation heat dissipation structure of the present application, the humidity and cleanliness of the incoming air can be guaranteed, and at the same time, the heat exchange efficiency between the coolant and the air or the inside of the motor can be improved.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to an internal circulation heat dissipation structure and a motor. Background Art

[0002] High-speed motors have the characteristics of high efficiency, small size, compact structure, and high power density. The corresponding heat loss is also relatively concentrated, and the temperature rise inside the motor is relatively high. Excessive temperature rise at the motor stator winding will cause the winding insulation to fail, excessive temperature rise at the rotor will cause the permanent magnet to demagnetize, and excessive temperature rise at the magnetic bearing will reduce the control accuracy of the magnetic bearing. In order to ensure the safe and stable operation of high-speed motors, it is necessary to develop a new cooling structure based on the characteristics of the motor. At the same time, in order to ensure the moisture-proof, explosion-proof, dust-proof and corrosion-resistant performance of the motor, the designed heat dissipation structure must also ensure that the cleanliness and humidity of the cooling air meet the requirements.

[0003] The cooling system for high-speed motors usually adopts air cooling structure or water cooling structure. Among them, single air cooling cannot achieve internal circulation cooling. The air inlet is connected to the outside air, and the air outlet is connected to the air inlet inside the motor, which makes it difficult to ensure the humidity and cleanliness of the incoming air; at the same time, the water cooling structure is an external structure or a built-in spiral structure, and the heat exchange efficiency with the air or the inside of the motor is low. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present application is to provide an internal circulation heat dissipation structure and a motor, which can ensure the humidity and cleanliness of the incoming air, and at the same time improve the heat exchange efficiency between the coolant and the air or the inside of the motor.

[0005] In order to solve the above problems, the present application provides an internal circulation heat dissipation structure, including a motor cylinder, on which at least two liquid flow channels extending along the axial direction are arranged, and an outer gas flow channel extending along the axial direction is arranged on the motor cylinder between two adjacent liquid flow channels, and an inner gas flow channel is formed on the inner circumference of the motor cylinder, and the inner gas flow channel and the outer gas flow channel are connected to form an internal circulation air duct.

[0006] Preferably, the wall thickness of the outer gas flow channel and that between two adjacent liquid flow channels are the same.

[0007] Preferably, there are multiple liquid flow channels, which are evenly spaced apart along the circumference of the motor barrel, and the external gas flow channel and the liquid flow channel are alternately arranged along the circumference of the motor barrel; and / or, the liquid flow channel is a fin-type liquid cooling flow channel.

[0008] Preferably, the minimum distance between the outer gas flow channel and the central axis of the motor barrel is greater than the minimum distance between the liquid flow channel and the central axis of the motor barrel, and the maximum distance between the outer gas flow channel and the central axis of the motor barrel is greater than the maximum distance between the liquid flow channel and the central axis of the motor barrel.

[0009] Preferably, adjacent liquid flow channels are connected via a connecting flow channel extending along the circumference of the motor cylinder, and the connecting flow channel is located radially outside or radially inside the outer gas flow channel.

[0010] Preferably, the liquid flow channels are connected in series, and the liquid flow channels include a flow channel inlet and a flow channel outlet. The flow channel inlet is located at the starting end of the liquid flow channel, and the flow channel outlet is located at the terminal end of the liquid flow channel.

[0011] Preferably, the liquid flow channels are connected in parallel, and the liquid flow channels include a flow channel inlet and a flow channel outlet. The flow channel inlet is located at the first end of the liquid flow channel at the bottom, and the flow channel outlet is located at the second end of the liquid flow channel at the top, and the first end and the second end are different ends.

[0012] Preferably, the connecting flow channels are connected along the circumferential direction to form an annular flow channel, and the first end and the second end of the liquid flow channel are respectively provided with annular flow channels. The annular flow channel located at the first end of the liquid flow channel connects the first ends of each liquid flow channel, and the annular flow channel located at the second end of the liquid flow channel connects the second ends of each liquid flow channel.

[0013] Preferably, the liquid flow channel is divided into multiple sections along the axial direction, and the minimum distances between at least two sections of the liquid flow channel and the central axis of the motor barrel are different.

[0014] Preferably, a motor rotor is disposed in the motor cylinder, and a driving fan is disposed at one end of the motor rotor, and the driving fan provides air circulation flow power for the inner circulation air duct.

[0015] Preferably, a retaining ring is sleeved on the outer peripheral side of the driving fan, and the retaining ring is fixedly arranged on the inner wall of the motor cylinder, and the inner diameter of the retaining ring is larger than the outer diameter of the driving fan.

[0016] Preferably, a driven fan is installed on the air inlet side of the driving fan. The driven fan is installed on the motor rotor through a sliding member, and the driven fan can rotate relative to the driving fan through the sliding member.

[0017] Preferably, a first blade diffuser is provided at the first end of the motor cylinder, and a sealing fit is formed between the first blade diffuser and the motor rotor via a first seal and a first oil-blocking sleeve.

[0018] Preferably, a second blade diffuser is provided at the second end of the motor cylinder, and a sealing fit is formed between the second blade diffuser and the motor rotor via a second seal and a second oil-blocking sleeve.

[0019] Preferably, a front bearing housing is installed on the first end of the inner circumference of the motor cylinder, a rear bearing housing is installed on the second end, a motor winding is installed in the middle, and a front radial iron core, a rotor iron core, a rear radial iron core, a front axial iron core, a thrust bearing and a rear axial iron core are sequentially arranged on the motor rotor, and inner gas flow channels are respectively arranged on the front bearing housing, the front radial iron core, the motor winding, the rotor iron core, the rear radial iron core, the rear bearing housing, the front axial iron core, the thrust bearing and the rear axial iron core.

[0020] According to another aspect of the present application, a motor is provided, comprising an internal circulation heat dissipation structure, which is the internal circulation heat dissipation structure mentioned above.

[0021] The internal circulation heat dissipation structure provided by the present application includes a motor barrel, at least two liquid flow channels extending in the axial direction are arranged on the motor barrel, an outer gas flow channel extending in the axial direction is arranged on the motor barrel between two adjacent liquid flow channels, an inner gas flow channel is formed on the inner circumference of the motor barrel, and the inner gas flow channel is connected with the outer gas flow channel to form an inner circulation air duct. In the internal circulation heat dissipation structure of the present application, the gas flow channel and the liquid flow channel are directly processed on the motor barrel, which can form an integral heat dissipation structure with a more compact structure. The outer gas flow channel and the liquid flow channel are arranged alternately in the circumferential direction, and the liquid flow channel adopts a fin-type flow channel, which can ensure the contact area between the cooling liquid and the air-cooling flow channel and the inside of the motor, and can increase the heat exchange efficiency. The outer gas flow channel and the inner gas flow channel form an inner circulation flow channel located inside the motor barrel, which can ensure the humidity and cleanliness of the air intake inside the motor, and meet the requirements of the motor in terms of moisture-proof, explosion-proof, dust-proof and corrosion-proof. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic cross-sectional view of an internal circulation heat dissipation structure of an embodiment of the present application;

[0023] Figure 2 This is a three-dimensional structural diagram of an internal circulation heat dissipation structure of an embodiment of the present application;

[0024] Figure 3 This is an end view of the internal circulation heat dissipation structure of an embodiment of the present application;

[0025] Figure 4 This is a schematic diagram of the liquid flow channel structure of the internal circulation heat dissipation structure of one embodiment of the present application;

[0026] Figure 5 This is a schematic diagram of the outer gas flow channel structure of the internal circulation heat dissipation structure of one embodiment of the present application;

[0027] Figure 6 This is a schematic diagram of the structure of an internal circulation heat dissipation structure of an embodiment of the present application;

[0028] Figure 7 for Figure 6 A schematic diagram of a BB-direction cross-sectional structure of an internal circulation heat dissipation structure;

[0029] Figure 8 for Figure 6 A CC-direction cross-sectional structural diagram of an internal circulation heat dissipation structure;

[0030] Fig. 9 This is a schematic diagram of the flow channel structure of the internal circulation heat dissipation structure of an embodiment of the present application.

[0031] The reference numerals are as follows:

[0032] 1. Motor cylinder; 2. External gas flow channel; 3. First blade diffuser; 4. First seal; 5. First oil-blocking sleeve; 6. Motor rotor; 7. Front bearing housing; 8. Motor winding; 9. Rotor core; 10. Driven fan; 11. Sliding member; 12. Driving fan; 13. Retaining ring; 14. Second oil-blocking sleeve; 15. Second seal; 16. Second blade diffuser; 17. Liquid flow channel; 18. Flow channel inlet; 19. Flow channel outlet; 20. Connecting flow channel; 21. Internal gas flow channel; 22. Flow passage; 23. Conical area; 24. First annular flow channel; 25. Second annular flow channel; 26. Rear radial core; 27. Rear bearing housing; 28. Front axial core; 29. ​​Thrust bearing; 30. Rear axial core; 31. Front radial core. DETAILED DESCRIPTION

[0033] See also Figures 1 to 9 As shown, according to an embodiment of the present application, the internal circulation heat dissipation structure includes a motor barrel 1, on which at least two liquid flow channels 17 extending along the axial direction are arranged, and an outer gas flow channel 2 penetrating along the axial direction is arranged on the motor barrel 1 between two adjacent liquid flow channels 17, and an inner gas flow channel 21 is formed on the inner circumference side of the motor barrel 1, and the inner gas flow channel 21 is connected to the outer gas flow channel 2 to form an internal circulation air duct.

[0034] The internal circulation heat dissipation structure of the present application, the outer gas flow channel 2 and the liquid flow channel 17 are directly processed on the motor barrel, which can form an integral heat dissipation structure with a more compact structure. The outer gas flow channel 2 and the liquid flow channel 17 are arranged alternately in a circumferential direction, and the liquid flow channel 17 adopts a fin-type flow channel, which can ensure the contact area between the cooling liquid and the air-cooling flow channel and the inside of the motor, and can increase the heat exchange efficiency. The outer gas flow channel 2 and the inner gas flow channel 21 are connected to form an inner circulation flow channel located inside the motor barrel, so that the heat exchange air circulates inside the motor, which can ensure the humidity and cleanliness of the incoming air inside the motor, and meet the requirements of the motor in terms of moisture-proof, explosion-proof, dust-proof and corrosion-proof.

[0035] In one embodiment, the wall thickness of the outer gas flow channel 2 is the same as that of two adjacent liquid flow channels 17. The liquid flow channel 17 is, for example, a fin-type liquid cooling flow channel.

[0036] In this embodiment, the wall thickness between the outer gas flow channel 2 and the two liquid flow channels 17 on both sides of the circumference is the same, so that the heat exchange between the liquid flow channels 17 on both sides and the outer gas flow channel 2 is more uniform. The outer gas flow channel 2 and the liquid flow channel 17 are both long and narrow structures, which can ensure that the hot air flowing through the inside of the motor barrel 1 has sufficient contact area with the liquid flow channel 17, and can improve the heat exchange efficiency between the outer gas flow channel 2 and the liquid flow channel 17.

[0037] In one embodiment, there are multiple liquid flow channels 17, and the multiple liquid flow channels 17 are evenly spaced along the circumference of the motor barrel 1, and the outer gas flow channels 2 and the liquid flow channels 17 are alternately arranged along the circumference of the motor barrel 1. In this embodiment, the outer gas flow channels 2 and the liquid flow channels 17 are alternately and evenly arranged along the axial direction of the motor barrel 1, which can form multiple heat exchange structures between the outer gas flow channels 2 and the liquid flow channels 17 to increase the heat exchange area, and can also ensure that the heat exchange between the gas and the liquid is more uniform, thereby improving the heat exchange efficiency.

[0038] In one embodiment, the minimum distance between the outer gas flow channel 2 and the central axis of the motor barrel 1 is greater than the minimum distance between the liquid flow channel 17 and the central axis of the motor barrel 1, and the maximum distance between the outer gas flow channel 2 and the central axis of the motor barrel 1 is greater than the maximum distance between the liquid flow channel 17 and the central axis of the motor barrel 1, which can ensure that the radial position of the outer gas flow channel 2 in the motor barrel 1 is within the radial range of the liquid flow channel 17 in the motor barrel 1, so that the outer gas flow channel 2 can be completely in the heat exchange center area of ​​the liquid flow channel 17, thereby ensuring efficient heat exchange between gas and liquid.

[0039] In one embodiment, adjacent liquid flow channels 17 are connected through a connecting flow channel 20 extending along the circumference of the motor barrel 1, and the connecting flow channel 20 is located radially outside or radially inside the outer gas flow channel 2. In this embodiment, by providing the connecting flow channel 20 between adjacent liquid flow channels 17, the connection between adjacent liquid flow channels 17 can be easily achieved, and by providing the connecting flow channel 20 radially outside and radially inside the outer gas flow channel 2, a gap is formed between the connecting flow channel 20 and the outer gas flow channel 2, so that the setting position of the connecting flow channel 20 can avoid the outer gas flow channel 2, thereby preventing the connecting flow channel 20 from obstructing the setting of the outer gas flow channel 2.

[0040] In one embodiment, the liquid flow channels 17 are connected in series, and the liquid flow channels 17 include a flow channel inlet 18 and a flow channel outlet 19 . The flow channel inlet 18 is located at the starting end of the liquid flow channel 17 , and the flow channel outlet 19 is located at the terminal end of the liquid flow channel 17 .

[0041] In one embodiment, the liquid flow channels 17 are connected in parallel, and the liquid flow channels 17 include a flow channel inlet 18 and a flow channel outlet 19. The flow channel inlet 18 is located at the first end of the liquid flow channel 17 at the bottom, and the flow channel outlet 19 is located at the second end of the liquid flow channel 17 at the top, and the first end and the second end are different ends.

[0042] In this embodiment, the connecting flow channel 20 is connected along the circumferential direction to form an annular flow channel. A first annular flow channel 24 is provided at the first end of the liquid flow channel 17, and a second annular flow channel 25 is provided at the second end of the liquid flow channel 17. The first annular flow channel 24 located at the first end of the liquid flow channel 17 connects the first ends of each liquid flow channel 17, and the second annular flow channel 25 located at the second end of the liquid flow channel 17 connects the second ends of each liquid flow channel 17.

[0043] The fin-type liquid flow channel extending axially is connected to the annular flow channels at both ends of the barrel, and the connecting flow channel 20 between two adjacent fin-type liquid flow channels is an arc-shaped flow channel. The cooling liquid enters the first annular flow channel 24 on the left side of the motor barrel 1 from the flow channel inlet 18 at the bottom of the motor barrel 1, and then enters each fin-type liquid flow channel through the first annular flow channel 24. The cooling liquid completes heat exchange with the inner wall of the motor barrel 1 and the hot air in the external gas flow channel 2 in the fin-type liquid flow channel, and then enters the second annular flow channel 25 at the right end of the motor barrel 1, and finally flows out from the flow channel outlet 19 at the top of the right end of the motor barrel 1, and flows back to the inside of the motor after heat dissipation on the outside to perform a heat exchange cycle.

[0044] In one embodiment, the liquid flow channel 17 is divided into multiple sections along the axial direction, and the minimum distances between at least two sections of the liquid flow channel 17 and the central axis of the motor barrel 1 are different, so that suitable liquid flow channels 17 can be set for key components such as bearing assemblies and motor stators, thereby further improving the heat dissipation efficiency of these components.

[0045] The liquid flow channel 17 can penetrate the entire motor barrel 1 axially, or the liquid flow channel can be processed only on the barrel wall outside the motor stator, so as to make the structure of the barrel casting sand core simpler and facilitate production.

[0046] In one embodiment, a motor rotor 6 is disposed in the motor barrel 1, and a driving fan 12 is disposed at one end of the motor rotor 6, and the driving fan 12 provides air circulation flow power for the inner circulation air duct. The driving fan 12 is fixedly sleeved on the motor rotor 6, and the driving fan 12 is located axially outside the motor winding 8. The inner cavity of the motor barrel 1 needs to increase the axial length for installing the driving fan 12 to facilitate the installation of the driving fan 12. When the motor is started, the motor rotor 6 rotates, driving the driving fan 12 to rotate, forming a rightward wind pressure, so that the gas in the inner gas flow channel 21 on the inner circumference of the motor barrel 1 flows to the right, and the gas in the outer gas flow channel 2 of the outer barrel of the motor flows to the left, providing power for the inner circulation of air.

[0047] In one embodiment, a retaining ring 13 is sleeved on the outer peripheral side of the driving fan 12, and the retaining ring 13 is fixedly arranged on the inner wall of the motor barrel 1, and the inner diameter of the retaining ring 13 is larger than the outer diameter of the driving fan 12. In this embodiment, the outer diameter of the retaining ring 13 is slightly larger than the inner diameter of the motor barrel 1, and the retaining ring 13 is sleeved on the inner wall of the motor barrel 1 by interference fit, and the inner diameter of the retaining ring 13 is slightly larger than the outer diameter of the driving fan 12, so that the airflow on the air outlet side of the driving fan 12 can be blocked, and the hot air on the air outlet side of the driving fan 12 is effectively prevented from flowing back to the air inlet side of the driving fan 12, thereby improving the gas flow efficiency and cooling efficiency.

[0048] In one embodiment, a driven fan 10 is installed on the air inlet side of the driving fan 12. The driven fan 10 is installed on the motor rotor 6 through a sliding member 11. The driven fan 10 can rotate relative to the driving fan 12 through the sliding member 11. The driven fan 10 is driven by the wind pressure formed by the rotation of the driving fan 12. When the driving fan 12 rotates, wind pressure toward the air outlet side is formed, driving the driven fan 10 to rotate. The rotation of the driven fan 10 will form wind pressure toward the air outlet side of the driving fan 12 in the space between the driven fan 10 and the driving fan 12, preventing the hot air that flows back from the gap between the driving fan 12 and the baffle ring 13 from continuing to flow back to the side of the driven fan 10 away from the driving fan 12.

[0049] In the embodiment of the present application, the sliding member 11 is similar to a bearing structure, and its inner diameter is slightly smaller than the motor rotor 6, and is mounted on the motor rotor 6 by means of interference fit; the outer diameter side of the sliding member 11 is similar to the outer end of the bearing, and can slide circumferentially relative to the inner diameter, thereby ensuring that the rotation of the driven fan 10 installed on the outer diameter of the sliding member 11 is driven by wind pressure, rather than directly driven by the motor rotor 6. In this way, when the driving fan 12 stops rotating together with the motor rotor 6, the motor rotor 6 can still rotate under the action of inertia, providing wind pressure toward the air outlet side of the driving fan 12, and more effectively avoiding hot air backflow.

[0050] In one embodiment, a first blade diffuser 3 is disposed at the first end of the motor barrel 1 , and a sealing fit is formed between the first blade diffuser 3 and the motor rotor 6 via a first seal 4 and a first oil-blocking sleeve 5 .

[0051] In one embodiment, a second blade diffuser 16 is disposed at the second end of the motor barrel 1 , and a sealing fit is formed between the second blade diffuser 16 and the motor rotor 6 via a second seal 15 and a second oil-blocking sleeve 14 .

[0052] The first seal 4 and the second seal 15 mentioned above are both comb-teeth seals.

[0053] In this embodiment, since there are comb seals, oil-blocking sleeves, diffusers and other devices at both ends of the motor to ensure the airtightness inside the motor, and the gas flow of this application only circulates between the inside of the motor and the air duct on the cylinder, there is no need for additional air seals. Only the air seals at both ends of the motor can ensure the airtightness of the internal circulation flow channel, the structure is simpler, and implementation is more convenient.

[0054] In one embodiment, a front bearing housing 7 is installed at the first end of the inner circumference of the motor barrel 1, a rear bearing housing 27 is installed at the second end, a motor winding 8 is installed in the middle, and a front radial core 31, a rotor core 9, a rear radial core 26, a front axial core 28, a thrust bearing 29 and a rear axial core 30 are sequentially arranged on the motor rotor 6, and an inner gas flow channel 21 is respectively arranged on the front bearing housing 7, the front radial core 31, the motor winding 8, the rotor core 9, the rear radial core 26, the rear bearing housing 27, the front axial core 28, the thrust bearing 29 and the rear axial core 30.

[0055] In this embodiment, a flow channel 22 is formed between the front bearing housing 7 and the first blade diffuser 3, and a flow channel 22 is also formed between the rear axial iron core 30 and the rear bearing housing 27 and the second blade diffuser 16. The flow channels 22 at the front and rear ends connect the two ends of the outer gas flow channel 2 and the inner gas flow channel 21 in series to form a circumferentially connected internal circulation air duct, and under the driving action of the driving fan 12, the internal circulation flow of the airflow is realized.

[0056] In one embodiment, conical areas 23 are provided at both ends of the motor barrel 1. The conical areas 23 extend along the circumference of the motor barrel 1 and connect the external gas flow channel 2 with the flow channel 22. The presence of the conical areas 23 can improve the flow state of the airflow, effectively reduce the flow resistance phenomenon, reduce the gas flow noise, and improve the gas flow efficiency.

[0057] According to an embodiment of the present application, the motor includes an internal circulation heat dissipation structure, which is the internal circulation heat dissipation structure mentioned above.

[0058] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0059] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. An internal circulation heat dissipation structure, characterized in that: The motor barrel (1) comprises a motor barrel (1), wherein at least two liquid flow channels (17) extending in the axial direction are arranged on the motor barrel (1), an outer gas flow channel (2) penetrating in the axial direction is arranged on the motor barrel (1) between two adjacent liquid flow channels (17), an inner gas flow channel (21) is formed on the inner circumference of the motor barrel (1), and the inner gas flow channel (21) is connected to the outer gas flow channel (2) to form an inner circulation air channel; A motor rotor (6) is arranged inside the motor cylinder (1), a driving fan (12) is arranged at one end of the motor rotor (6), and the driving fan (12) provides air circulation flow power for the internal circulation air duct; A driven fan (10) is installed on the air inlet side of the driving fan (12), and the driven fan (10) is installed on the motor rotor (6); the driven fan (10) is driven by the wind pressure generated by the rotation of the driving fan (12), and when the driving fan (12) rotates, wind pressure is generated toward the air outlet side, driving the driven fan (10) to rotate; wherein, the rotation of the driven fan (10) forms wind pressure toward the air outlet side of the driving fan (12) in the space between the driven fan (10) and the driving fan (12).

2. The internal circulation heat dissipation structure according to claim 1, characterized in that: The wall thickness of the outer gas flow channel (2) and two adjacent liquid flow channels (17) is the same.

3. The internal circulation heat dissipation structure according to claim 1, characterized in that: There are a plurality of liquid flow channels (17), and the plurality of liquid flow channels (17) are evenly spaced and distributed along the circumference of the motor barrel (1); the external gas flow channel (2) and the liquid flow channel (17) are alternately arranged along the circumference of the motor barrel (1); and / or the liquid flow channel (17) is a fin-type liquid cooling flow channel.

4. The internal circulation heat dissipation structure according to claim 1, characterized in that: The minimum distance between the outer gas flow channel (2) and the central axis of the motor barrel (1) is greater than the minimum distance between the liquid flow channel (17) and the central axis of the motor barrel (1), and the maximum distance between the outer gas flow channel (2) and the central axis of the motor barrel (1) is greater than the maximum distance between the liquid flow channel (17) and the central axis of the motor barrel (1).

5. The internal circulation heat dissipation structure according to claim 1, characterized in that: Adjacent liquid flow channels (17) are connected via a connecting flow channel (20) extending along the circumference of the motor barrel (1), and the connecting flow channel (20) is located radially outside or radially inside the outer gas flow channel (2).

6. The internal circulation heat dissipation structure according to claim 5, characterized in that: The liquid flow channels (17) are connected in series, and the liquid flow channels (17) include a flow channel inlet (18) and a flow channel outlet (19). The flow channel inlet (18) is located at the starting end of the liquid flow channel (17), and the flow channel outlet (19) is located at the terminal end of the liquid flow channel (17).

7. The internal circulation heat dissipation structure according to claim 5, characterized in that: The liquid flow channels (17) are connected in parallel, and the liquid flow channels (17) include a flow channel inlet (18) and a flow channel outlet (19). The flow channel inlet (18) is located at a first end of the liquid flow channel (17) at the bottom, and the flow channel outlet (19) is located at a second end of the liquid flow channel (17) at the top, and the first end and the second end are different ends.

8. The internal circulation heat dissipation structure according to claim 7, characterized in that: The connecting flow channel (20) is connected along the circumferential direction to form an annular flow channel. The first end and the second end of the liquid flow channel (17) are respectively provided with the annular flow channel. The annular flow channel located at the first end of the liquid flow channel (17) connects the first ends of each of the liquid flow channels (17), and the annular flow channel located at the second end of the liquid flow channel (17) connects the second ends of each of the liquid flow channels (17).

9. The internal circulation heat dissipation structure according to claim 1, characterized in that: The liquid flow channel (17) is divided into multiple sections along the axial direction, and the minimum distances between at least two sections of the liquid flow channel (17) and the central axis of the motor barrel (1) are different.

10. The internal circulation heat dissipation structure according to claim 1, characterized in that: A retaining ring (13) is sleeved on the outer peripheral side of the driving fan (12); the retaining ring (13) is fixedly arranged on the inner wall of the motor cylinder (1); and the inner diameter of the retaining ring (13) is larger than the outer diameter of the driving fan (12).

11. The internal circulation heat dissipation structure according to claim 1, characterized in that: The driven fan (10) is mounted on the motor rotor (6) via a sliding member (11), and the driven fan (10) can rotate relative to the driving fan (12) via the sliding member (11).

12. The internal circulation heat dissipation structure according to claim 1, characterized in that: A first blade diffuser (3) is provided at the first end of the motor barrel (1), and a sealing fit is formed between the first blade diffuser (3) and the motor rotor (6) via a first seal (4) and a first oil-blocking sleeve (5).

13. The internal circulation heat dissipation structure according to claim 1, characterized in that: A second blade diffuser (16) is provided at the second end of the motor barrel (1), and a sealing fit is formed between the second blade diffuser (16) and the motor rotor (6) via a second seal (15) and a second oil-blocking sleeve (14).

14. The internal circulation heat dissipation structure according to claim 1, characterized in that: A front bearing housing (7) is installed at the first end of the inner circumference of the motor barrel (1), a rear bearing housing (27) is installed at the second end, and a motor winding (8) is installed in the middle; a front radial iron core (31), a rotor iron core (9), a rear radial iron core (26), a front axial iron core (28), a thrust bearing (29) and a rear axial iron core (30) are sequentially arranged on the motor rotor (6); and the front bearing housing (7), the front radial iron core (31), the motor winding (8), the rotor iron core (9), the rear radial iron core (26), the rear bearing housing (27), the front axial iron core (28), the thrust bearing (29) and the rear axial iron core (30) are respectively provided with the inner gas flow channel (21).

15. A motor, comprising an internal circulation heat dissipation structure, characterized in that: The internal circulation heat dissipation structure is the internal circulation heat dissipation structure according to any one of claims 1 to 14.

Images