Structure and heat dissipation method of annular cooling channel at rotor end of doubly fed motor

Abstract

This invention discloses a structure and method for an annular cooling channel at the rotor end of a doubly-fed induction generator (DFIG), relating to the field of motor heat dissipation. Specifically, it includes a motor housing and a rotor rotatably disposed inside the housing, with a rotating shaft fixedly positioned at the center of the rotor. The invention utilizes the rotation of the rotating shaft to drive a support tube, causing the coolant within the annular cooling tube to rotate at high speed. This, combined with the stirring effect of an interference plate, creates strong turbulence, enhancing heat dissipation at the rotor end. The high-speed rotation of the cooling fan generates airflow through a converging shroud, forcing the airflow to concentrate through the middle of the rotor, reducing airflow leakage at the end, increasing the airflow speed in the middle, and improving the overall heat dissipation efficiency and temperature uniformity in the middle. The rotation of the rotating shaft also causes multiple sets of inclined fan blades on the outer wall of the annular cooling tube to generate airflow, enhancing airflow on the outside of the rotor. Therefore, by addressing heat dissipation at the rotor end, the middle of the rotor, and the outside of the rotor, the heat dissipation effect of the DFIG rotor is improved collectively.

Description

Technical Field

[0001] This invention relates to the field of motor heat dissipation technology, and more specifically, to a doubly fed motor rotor end annular cooling channel structure and heat dissipation method. Background Technology

[0002] During the operation of a doubly fed motor, the rotor, as a key component, generates heat at high speed, which is one of the important factors affecting the motor's performance and lifespan. Especially under high load and long-term operation conditions, the rotor end is prone to forming local high-temperature areas due to its long heat dissipation path and relatively limited heat dissipation area. This not only reduces the motor's efficiency but may also accelerate the aging of the motor's insulation materials and even cause motor failure, seriously affecting the motor's reliability and service life.

[0003] Currently, heat dissipation technologies for motor rotors mainly focus on heat dissipation design on the rotor surface or outside, such as using a fan to directly blow on the rotor surface, or setting heat dissipation fins or heat dissipation holes on the motor housing. However, these technologies have limited heat dissipation effect on the internal parts of the rotor end and cannot effectively solve the problem of local high temperature caused by poor heat dissipation at the rotor end.

[0004] In addition, the heat generated in the middle of the rotor and the area between the rotor and the stator is different during motor operation. When the fan blows directly on the rotor surface, the airflow is insufficient due to the shielding effect of the rotor structure (such as the rotor core, windings, etc.), resulting in poor heat dissipation.

[0005] Furthermore, the air gap between the rotor and stator is one of the important channels for heat dissipation of the motor. However, when the fan blows directly on the rotor surface, it may not be able to fully cover this area, causing heat to accumulate in the air gap and affecting the overall heat dissipation effect of the motor. Here is a solution. Summary of the Invention

[0006] To overcome the above-mentioned defects of the prior art, the present invention provides a doubly fed motor rotor end annular cooling channel structure and heat dissipation method.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a doubly fed motor rotor end annular cooling channel structure, including a motor housing and a rotor rotatably disposed inside the motor housing, a rotating shaft is fixedly disposed at the center of the rotor, and annular cooling pipes for cooling the rotor end are disposed on both outer walls of the rotor, and multiple sets of inclined fan blades are fixedly installed on the outer circumferential wall of a set of annular cooling pipes.

[0008] A liquid inlet pipe is provided at the center of the rotating shaft, and annular conveying cavities are provided on the inner walls of both sides of the rotating shaft. The annular conveying cavities are connected to the liquid inlet pipe through connecting pipes, and the output end of the annular conveying cavities is connected to annular cooling pipes through multiple sets of support pipes.

[0009] A gathering cover is fixedly installed at the end of a set of annular cooling pipes, and a cooling fan is fixedly installed on the outer wall of the rotating shaft near the end of the gathering cover, with the cooling fan facing the gathering cover.

[0010] Furthermore, a liquid outlet pipe is provided on the inner wall of the rotating shaft, and the output end of the annular cooling pipe is connected to the liquid outlet pipe through a return pipe.

[0011] Furthermore, the annular cooling pipe is internally fitted with multiple sets of circularly arrayed interference plates.

[0012] Furthermore, multiple sets of the fan blades are evenly distributed on the outer wall of the annular cooling pipe, and multiple sets of the annular cooling pipe are evenly distributed on the outer side of the annular conveying cavity.

[0013] Furthermore, a pair of support feet are fixedly installed on the bottom side wall of the motor housing, and heat dissipation holes are provided on the side wall of the motor housing near the cooling fan.

[0014] Furthermore, an annular limiting plate is fixedly installed on the end wall of the support tube near the rotating shaft, a locking sleeve is slidably installed on the side wall of the support tube near the rotating shaft, a connecting sleeve is fixedly installed at the output end of the annular conveying cavity, the locking sleeve is threadedly connected to the connecting sleeve, and a rubber pad is fixedly installed on the side wall of the connecting sleeve near the locking sleeve.

[0015] The heat dissipation method for the annular cooling channel structure at the rotor end of a doubly-fed motor includes the following steps:

[0016] Coolant circulation path: Coolant is introduced into the inlet pipe, and then enters two annular delivery chambers through the connecting pipe. The coolant inside the annular delivery chamber is distributed into the annular cooling pipe by multiple sets of support pipes, and then enters the outlet pipe through the return pipe, and is output through the outlet pipe.

[0017] Rotor end heat dissipation: When the shaft rotates, the support tube drives the annular cooling tube to rotate with it. The coolant inside the annular cooling tube rotates at high speed. Combined with the interference of the interference plate, the coolant inside the annular cooling tube is disturbed and stirred, causing the coolant to form strong turbulence in the annular pipe.

[0018] Heat dissipation in the middle and outer part of the rotor: When the shaft rotates, multiple sets of inclined fan blades on the outer wall of the annular cooling pipe generate airflow, which enhances the airflow on the outside of the rotor. The wind speed generated by the high-speed rotation of the cooling fan blows towards the converging shroud. The converging shroud forces the airflow to concentrate through the middle of the rotor by contracting the airflow channel, reducing airflow leakage at the end and increasing the wind speed in the middle.

[0019] The technical effects and advantages of this invention are as follows:

[0020] 1. The present invention uses a rotating shaft to drive the support tube to rotate with it. The coolant inside the annular cooling tube rotates at high speed. Combined with the interference of the interference plate, the coolant inside the annular cooling tube is stirred, so that the coolant forms strong turbulence in the annular pipe, which enhances the heat dissipation effect of the coolant on the rotor end.

[0021] 2. The present invention generates airflow through multiple sets of inclined fan blades on the outer wall of the annular cooling pipe by rotating the shaft, which enhances the airflow on the outside of the rotor. The wind speed generated by the high-speed rotation of the cooling fan blows towards the converging shroud. The converging shroud forces the airflow to concentrate through the middle of the rotor by contracting the airflow channel, reducing airflow leakage at the end and increasing the wind speed in the middle. The overall heat dissipation efficiency of the middle of the rotor is higher and the temperature uniformity is better.

[0022] 3. This invention uses the rotation of the shaft to drive the support tube, causing the coolant in the annular cooling tube to rotate at high speed. Combined with the stirring of the interference plate, it forms strong turbulence, which enhances the heat dissipation at the rotor end. The wind speed generated by the high-speed rotation of the cooling fan is compressed through the airflow channel by the converging shroud, forcing the airflow to concentrate through the middle of the rotor, reducing airflow leakage at the end, increasing the wind speed in the middle, and improving the overall heat dissipation efficiency and temperature uniformity in the middle. The rotation of the shaft causes multiple sets of inclined fan blades on the outer wall of the annular cooling tube to generate airflow, enhancing the airflow on the outside of the rotor. In other words, it improves the heat dissipation effect of the doubly-fed motor rotor by starting from the heat dissipation at the rotor end, the heat dissipation in the middle of the rotor, and the heat dissipation on the outside of the rotor. Attached Figure Description

[0023] Figure 1 This is a three-dimensional view of the heat dissipation structure on the outside of the rotor in this invention.

[0024] Figure 2 This is a cross-sectional view of the rotor inside the present invention.

[0025] Figure 3 This is a three-dimensional view of a portion of the heat dissipation structure in this invention.

[0026] Figure 4 This is a three-dimensional view of a portion of the heat dissipation structure in this invention.

[0027] Figure 5 This is a cross-sectional view of the internal structure of the shell in this invention.

[0028] Figure 6 This is a perspective view of the overall structure of the present invention.

[0029] The attached figures are labeled as follows:

[0030] 1. Rotor; 2. Shaft; 31. Annular cooling pipe; 32. Fan blades; 33. Inlet pipe; 34. Outlet pipe; 35. Annular conveying chamber; 36. Connecting pipe; 37. Interference plate; 38. Support pipe; 39. Return pipe; 4. Cooling fan; 5. Gathering cover; 6. Heat dissipation hole; 7. Motor housing; 8. Support foot; 91. Locking sleeve; 92. Circular limiting plate; 93. Connecting sleeve; 94. Rubber pad. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1: Please refer to Figures 1-6 As shown, the following solutions can be used to address the problems of localized high temperatures at the rotor end due to poor heat dissipation and the poor cooling effect of direct fan cooling, which are difficult to solve effectively.

[0033] The doubly fed motor rotor end annular cooling channel structure in this embodiment includes a motor housing 7 and a rotor 1 rotatably disposed inside the motor housing 7. A rotating shaft 2 is fixedly disposed at the center of the rotor 1. Annular cooling pipes 31 for cooling the ends of the rotor 1 are disposed on both outer walls of the rotor 1. Multiple sets of inclined fan blades 32 are fixedly installed on the outer circumferential wall of a set of annular cooling pipes 31. When the rotating shaft 2 rotates, the fan blades 32 generate airflow, enhance the airflow outside the rotor 1, and improve the heat dissipation effect.

[0034] A liquid inlet pipe 33 is provided at the center of the rotating shaft 2. Annular conveying chambers 35 are provided on the inner walls of the rotating shaft 2 on both sides of the rotor 1. The annular conveying chambers 35 are connected to the liquid inlet pipe 33 through a connecting pipe 36, so that the coolant can enter from the liquid inlet pipe 33 and be distributed into the two annular conveying chambers 35.

[0035] The output end of the annular conveying chamber 35 is connected to the annular cooling pipe 31 through multiple sets of support pipes 38 to deliver coolant into the annular cooling pipe 31;

[0036] A set of annular cooling pipes 31 is fixedly provided with a gathering cover 5 at the end. A cooling fan 4 is fixedly provided on the outer wall of the rotating shaft 2 near the end of the gathering cover 5. The cooling fan 4 is positioned towards the gathering cover 5.

[0037] When the shaft 2 rotates, the wind generated by the high-speed rotation of the cooling fan 4 blows towards the converging cover 5. The converging cover 5 forces the airflow to concentrate through the middle of the rotor 1 by contracting the airflow channel, reducing airflow leakage at the end and increasing the wind speed in the middle, thereby improving the heat dissipation efficiency of the middle of the rotor 1.

[0038] Through the annular cooling pipe 31 and the inclined fan blades 32 on its outer wall, combined with the liquid inlet pipe 33 at the center of the rotating shaft 2, the annular conveying chamber 35 and the cooling fan 4, comprehensive heat dissipation is achieved at the end, middle and outer sides of the rotor 1. When the rotating shaft 2 rotates, the coolant in the annular cooling pipe 31 rotates at high speed and forms strong turbulence, which enhances the heat dissipation at the end of the rotor 1.

[0039] Meanwhile, the airflow generated by the cooling fan 4 is concentrated through the middle of the rotor 1 after being contracted by the converging cover 5, which improves the airflow speed and heat dissipation efficiency in the middle. In addition, the inclined fan blades 32 on the outer wall of the annular cooling pipe 31 enhance the airflow on the outside of the rotor 1, further improving the overall heat dissipation effect and effectively solving the problem of local high temperature at the end of the rotor 1 caused by poor heat dissipation.

[0040] Example 2: Please refer to Figures 1-6 As shown, a liquid outlet pipe 34 is also provided on the inner wall of the rotating shaft 2. The output end of the annular cooling pipe 31 is connected to the liquid outlet pipe 34 through the return pipe 39; so that the coolant can be discharged through the return pipe 39 and the liquid outlet pipe 34 after completing the heat dissipation of the rotor 1.

[0041] The annular cooling pipe 31 is internally fixed with multiple sets of circular array interference plates 37;

[0042] When the shaft 2 rotates, the support tube 38 drives the annular cooling tube 31 to rotate with it. The coolant inside the annular cooling tube 31 rotates at high speed. Combined with the interference effect of the interference plate 37, the coolant inside the annular cooling tube 31 is stirred, so that the coolant forms strong turbulence in the annular pipe, thereby enhancing the heat dissipation effect of the coolant on the end of the rotor 1.

[0043] Multiple sets of fan blades 32 are evenly distributed on the outer wall of the annular cooling pipe 31 to ensure the consistency and uniformity of heat dissipation effect. Multiple sets of annular cooling pipes 31 are evenly distributed on the outer side of the annular conveying cavity 35.

[0044] A pair of support feet 8 are fixedly installed on the bottom side wall of the motor housing 7 to provide stable support for the motor. Heat dissipation holes 6 are provided on the side wall of the motor housing 7 near the cooling fan 4.

[0045] Please see Figure 5 As shown, a circular limiting plate 92 is fixedly installed on the end wall of the support tube 38 near the rotating shaft 2, a locking sleeve 91 is slidably installed on the side wall of the support tube 38 near the rotating shaft 2, a connecting sleeve 93 is fixedly installed at the output end of the annular conveying cavity 35, the locking sleeve 91 is threadedly connected to the connecting sleeve 93, and a rubber pad 94 is fixedly installed on the side wall of the connecting sleeve 93 near the locking sleeve 91.

[0046] It needs to be explained here that: the locking sleeve 91 is rotated, the locking sleeve 91 moves towards the connecting sleeve 93 and is threadedly connected to the outer wall of the connecting sleeve 93 until the locking sleeve 91 is pressed against the outer wall of the rubber pad 94 to seal the support tube 38. The return tube 39 is also connected to the rotating shaft 2 in the same way.

[0047] By opening a liquid outlet pipe on the inner wall of the rotating shaft 2, the coolant in the annular cooling pipe 31 can be smoothly discharged through the return pipe 39 and the liquid outlet pipe 34, forming a complete coolant circulation system.

[0048] Multiple circular arrays of interference plates 37 are set inside the annular cooling pipe 31. When the rotating shaft 2 drives the annular cooling pipe 31 to rotate, the interference plates 37 stir the coolant to form strong turbulence, which enhances the heat dissipation effect on the end of the rotor 1.

[0049] In addition, the connection structure design between the support tube 38 and the rotating shaft 2 ensures the sealing and stability of the cooling system, thereby further improving the heat dissipation efficiency and reliability of the doubly fed motor rotor 1.

[0050] In this invention, as can be seen from Embodiment 1 and Embodiment 2:

[0051] The rotation of the shaft 2 drives the support tube 38 to make the coolant in the annular cooling tube 31 rotate at high speed. Combined with the stirring of the interference plate 37, it forms strong turbulence, which enhances the heat dissipation at the end of the rotor 1. The wind speed generated by the high-speed rotation of the cooling fan 4 is narrowed by the converging cover 5, which forces the airflow to concentrate through the middle of the rotor 1, reduces the airflow leakage at the end, increases the wind speed in the middle, and improves the overall heat dissipation efficiency and temperature uniformity in the middle. The rotation of the shaft 2 causes the multiple sets of inclined fan blades 32 on the outer wall of the annular cooling tube 31 to generate airflow, which enhances the airflow on the outside of the rotor 1. That is, from the heat dissipation at the end of the rotor 1, the heat dissipation in the middle of the rotor 1, and the heat dissipation on the outside of the rotor 1, the heat dissipation effect of the doubly fed motor rotor 1 is improved.

[0052] Working principle: Coolant circulation path: Coolant is introduced into the inlet pipe 33, and the coolant enters the two annular delivery chambers 35 through the connecting pipe 36. The coolant inside the annular delivery chamber 35 is distributed into the annular cooling pipe 31 by multiple sets of support pipes 38, and then enters the outlet pipe 34 through the return pipe 39, and is output through the outlet pipe 34.

[0053] Heat dissipation at the end of rotor 1: When the shaft 2 rotates, the support tube 38 drives the annular cooling tube 31 to rotate with it. The coolant inside the annular cooling tube 31 rotates at high speed. Combined with the interference of the interference plate 37, the coolant inside the annular cooling tube 31 is disturbed and stirred, so that the coolant forms strong turbulence in the annular pipe, which enhances the heat dissipation effect of the coolant on the end of rotor 1.

[0054] Heat dissipation in the middle and outer parts of rotor 1: When the shaft 2 rotates, multiple sets of inclined fan blades 32 on the outer wall of the annular cooling pipe 31 generate airflow, enhancing the airflow on the outer side of rotor 1. The wind speed generated by the high-speed rotation of the cooling fan 4 blows towards the converging cover 5. The converging cover 5 forces the airflow to concentrate through the middle of rotor 1 by contracting the airflow channel, reducing airflow leakage at the end and increasing the wind speed in the middle. The overall heat dissipation efficiency of the middle part of rotor 1 is higher and the temperature uniformity is better.

[0055] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A double-fed motor rotor end annular cooling channel structure, comprising a motor shell (7) and a rotor (1) rotatably arranged inside the motor shell (7), and a rotating shaft (2) fixedly arranged at the center of the rotor (1), characterized in that, The outer wall of the rotor (1) is provided with annular cooling pipes (31) for cooling the end of the rotor (1), and the outer circumferential wall of a group of the annular cooling pipes (31) is fixedly provided with a plurality of groups of obliquely arranged fan blades (32); The center of the rotating shaft (2) is provided with a liquid inlet pipe (33), the inner wall of the rotating shaft (2) located on both sides of the rotor (1) is provided with an annular conveying cavity (35), the annular conveying cavity (35) is communicated with the liquid inlet pipe (33) through a connecting pipe (36), and the output end of the annular conveying cavity (35) is connected with the annular cooling pipe (31) through a plurality of support pipes (38); The end of a group of the annular cooling pipes (31) is fixedly provided with a converging cover (5), the outer wall of the rotating shaft (2) close to the end of the converging cover (5) is fixedly provided with a heat dissipation fan (4), and the heat dissipation fan (4) is arranged towards the converging cover (5); The inner wall of the rotating shaft (2) is further provided with a liquid outlet pipe (34), and the output end of the annular cooling pipe (31) is connected with the liquid outlet pipe (34) through a backflow pipe (39).

2. The doubly-fed machine rotor end- turn annular cooling channel structure of claim 1, wherein: The inner wall of the rotating shaft (2) is further provided with a liquid outlet pipe (34), and the output end of the annular cooling pipe (31) is connected with the liquid outlet pipe (34) through a backflow pipe (39).

3. The doubly-fed machine rotor end- turn annular cooling channel structure of claim 1, wherein: A plurality of groups of the fan blades (32) are uniformly distributed on the outer side wall of the annular cooling pipe (31), and a plurality of groups of the annular cooling pipes (31) are uniformly distributed on the outer side of the annular conveying cavity (35).

4. The doubly-fed machine rotor end- turn annular cooling channel structure of claim 1, wherein: The bottom side wall of the motor shell (7) is fixedly provided with a pair of support feet (8), and the side wall of the motor shell (7) close to the heat dissipation fan (4) is provided with a heat dissipation hole (6).

5. The doubly-fed machine rotor end- turn annular cooling channel structure of claim 1, wherein: The end wall of the support pipe (38) close to the rotating shaft (2) is fixedly provided with a circular ring limiting plate (92), the side wall of the support pipe (38) close to the rotating shaft (2) is slidably provided with a locking sleeve (91), the output end of the annular conveying cavity (35) is fixedly provided with a connecting sleeve (93), the locking sleeve (91) is threadedly connected with the connecting sleeve (93), and the side wall of the connecting sleeve (93) close to the locking sleeve (91) is fixedly provided with a rubber pad (94).

6. A method of heat dissipation from a double-fed machine rotor end annular cooling channel structure, characterized by, The double-fed motor rotor end annular cooling channel structure comprises the following steps: The cooling liquid circulation path is as follows: cooling liquid is input into the liquid inlet pipe (33), the cooling liquid enters two annular conveying cavities (35) through the connecting pipe (36) respectively, the cooling liquid in the annular conveying cavities (35) is distributed into the annular cooling pipes (31) through a plurality of support pipes (38), and then enters the liquid outlet pipe (34) through the backflow pipe (39) and is output through the liquid outlet pipe (34); When the rotating shaft (2) rotates, the support pipe (38) drives the annular cooling pipe (31) to rotate, the cooling liquid in the annular cooling pipe (31) rotates at high speed, the interference and stirring of the interference plate (37) to the cooling liquid in the annular cooling pipe (31) are matched, the cooling liquid in the annular pipe forms strong turbulent flow, and the end of the rotor (1) is cooled. The middle and outer side of the rotor (1) are cooled: when the rotating shaft (2) rotates, the airflow is generated by the multiple sets of inclined fan blades (32) on the outer wall of the annular cooling pipe (31), which enhances the air flow on the outer side of the rotor (1), and the wind speed generated by the high-speed rotation of the cooling fan (4) blows towards the converging cover (5), the converging cover (5) forces the airflow to pass through the middle of the rotor (1) through the contraction airflow channel, reduces the leakage of the end airflow, and improves the middle wind speed.

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