A high-voltage asynchronous motor cooling ventilation system

Abstract

The application discloses a high-voltage asynchronous motor cooling ventilation system and relates to the technical field of motor cooling. The system comprises a shell, an equipment cavity and a heat exchange cavity are arranged in the shell, a heat exchange assembly is arranged in the heat exchange cavity, the inside of the heat exchange cavity is separated into heat exchange channels by the heat exchange assembly, a rotor and a stator are arranged in the inside of the equipment cavity, a support frame matched with the stator is arranged on the inner wall of the equipment cavity, a plurality of limiting blocks matched with the circumferential side of the stator and circumferentially distributed are arranged on the support frame, and a heat exchange gap is formed between the stator and the support frame. The annular beam waist plate and other settings of the adjusting assembly are adjusted, the first detecting piece is phase changed under the action of temperature and drives the adjusting piece to work, the flow guide plate is moved to the outlet end of the heat exchange channel, more low-temperature gas after heat exchange is guided into the flow guide cavity and the subsequent passage, and the dynamic distribution of the cooling medium is realized.

Description

Technical Field

[0001] This invention relates to the field of motor cooling technology, and more particularly to a cooling and ventilation system for a high-voltage asynchronous motor. Background Technology

[0002] As the international community continues to pay more attention to energy conservation and environmental protection, energy-saving, high-efficiency, and high-power-density motors have become the future development trend. As a result, the structural requirements of high-voltage asynchronous motors are becoming more and more compact, while the single-unit capacity is becoming larger and larger. This requires the limited heat dissipation area to remove more heat, making the internal heat generation problem of the motor particularly prominent.

[0003] Taking the YXKK series motor as an example, its cooling air path is divided into two parts: the internal air path and the external air path. The internal air path adopts a closed circulation structure. A centrifugal fan is installed at the end of the motor shaft. The centrifugal fan generates sufficient pressure to force the internal fluid to circulate. The external air path has an external fan installed coaxially at the other end of the motor shaft, which allows the low-temperature outside air to enter the cooling pipe. The forced convection heat exchange between the inside and outside of the cooling pipe achieves the purpose of cooling the fluid in the internal air path.

[0004] However, finite element analysis revealed that the magnetic field distribution is most uniform and strongest in the central region of the stator core, resulting in the greatest core loss and consistently higher temperature in this area compared to other parts. Current technologies employ air cooling, liquid cooling, and a combination of both for the stator and rotor. However, due to limitations in the stator-motor housing installation, uneven distribution of cooling medium flow, and heat attenuation, the actual heat dissipation in the central region of the stator remains unsatisfactory, with temperatures often hovering around 110°C. Frequent motor starts or heavy-load starts further exacerbate this problem. This is because the starting current can reach 5-7 times the rated value, generating a huge instantaneous thermal shock. The cooling system's response often exhibits inertia; the fan needs time to establish stable air pressure and flow, but heat is already rapidly generated in the central region. Frequent starts and heavy-load starts cause heat to accumulate continuously in the central region, preventing timely removal and exacerbating the temperature rise issue.

[0005] Furthermore, even if a stable air pressure and flow rate have been established inside the motor, the installation method of the stator and the housing restricts the flow direction of the cooling medium. That is, the cooling medium can only pass through the gap between the rotor and the stator, and only a very small part will directly act on the outer circumference of the stator. This makes it impossible for the cooling system to effectively dissipate heat from the middle of the stator. When the temperature in the middle of the stator is significantly higher than that at the end of the stator, the existing technology is also unable to make adaptive adjustments for this area.

[0006] To address these issues, this invention proposes a high-voltage asynchronous motor cooling and ventilation system. Summary of the Invention

[0007] The purpose of this invention is to provide a high-voltage asynchronous motor cooling and ventilation system to solve the technical problems mentioned in the background section.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a high-voltage asynchronous motor cooling and ventilation system, comprising a housing, wherein an equipment cavity and a heat exchange cavity are provided inside the housing, a heat exchange component is provided inside the heat exchange cavity, and heat exchange channels are formed inside the heat exchange cavity by the heat exchange component, a rotor and a stator are provided inside the equipment cavity, a support frame matching the stator is provided on the inner wall of the equipment cavity, and a plurality of circumferentially distributed limiting blocks matching the circumferential side of the stator are provided on the support frame, and a heat exchange gap is formed between the stator and the support frame;

[0009] The heat exchange cavity is provided with a flow guide cavity located below the heat exchange channel. The flow guide cavity is provided with a flow guide corresponding to the outlet end of the heat exchange channel. The equipment cavity is provided with an adjustment assembly located on the circumferential side of the stator. The adjustment assembly includes a first detection element located inside the limiting plate and close to the flow guide cavity. An adjustment element is provided between the first detection element and the flow guide cavity. The adjustment element can adjust the flow rate of the heat exchange medium in the heat exchange gap under the action of the first detection element.

[0010] Preferably, the support frame is provided with an annular plate, and an annular cavity is formed between the annular plate and the support frame. The adjusting component includes a main hydraulic cylinder that penetrates the support frame and extends into the guide cavity. A first piston rod is slidably connected to the inside of the main hydraulic cylinder. An installation groove is provided on the inner wall of the guide cavity. Two symmetrically arranged auxiliary hydraulic cylinders are provided in the installation groove. A second piston rod is slidably connected to the inside of each of the two auxiliary hydraulic cylinders. The main hydraulic cylinder and the two auxiliary hydraulic cylinders are connected by a pipe. The guide component includes a guide plate that is fixedly connected to the two second piston rods. A plurality of guide wheels located inside the installation groove are provided at the bottom of the guide plate.

[0011] Preferably, the first detection element is located at the middle of the stator circumference, the first piston rod is fixedly connected to the first detection element, and the first detection element is made of phase change material;

[0012] When the first detection element deforms at high temperature, the first piston rod moves under the push of the first detection element and causes the hydraulic oil in the main hydraulic cylinder to enter the two auxiliary hydraulic cylinders. The second piston rod pushes the guide plate to move towards the side closer to the outlet end of the heat exchange channel under hydraulic drive. Conversely, the guide plate resets.

[0013] Preferably, the flow guide cavity is provided with multiple air inlet pipes, the outlet end of the air inlet pipes passes through the annular plate into the annular cavity, the annular cavity is provided with an auxiliary plate that matches the flow guide plate, the auxiliary plate can guide the cooling medium in the annular cavity into the air inlet pipes, and the inner wall of the annular cavity is provided with multiple oblique holes that penetrate into the heat exchange gap.

[0014] Preferably, the angle between the extended axis of the outlet end of the air inlet pipe and the center line of the stator is an acute angle, and the multiple air inlet pipes located on both sides of the main hydraulic cylinder are symmetrically arranged along the center line of the stator.

[0015] Preferably, the inner wall of the support frame is provided with an annular waist plate located in the middle of the stator circumference, and the heat exchange gap diameter of the annular waist plate area is smaller than the heat exchange gap diameter of the stator end areas.

[0016] Preferably, the bottom of the device cavity is provided with a radial adjustment mechanism, which includes a second detection element disposed within a corresponding limiting block. Two symmetrically arranged annular bars are disposed within the annular cavity, and the two annular bars divide the middle of the annular cavity into a central cavity. An elastic element is disposed on one side opposite to the two annular bars, and an adjustment cavity is formed between the elastic element and the annular bar. An actuator matching the second detection element is disposed at the bottom of the device cavity. The actuator can expand or contract the elastic element under the action of the second detection element to change the volume of the central cavity.

[0017] Preferably, the actuator includes a hydraulic tank fixedly connected to the equipment cavity, a piston plate is slidably connected to the inside of the hydraulic tank, a piston shaft fixedly connected to the second detection element is fixedly connected to the piston plate, and a plurality of connecting pipes fixedly connected to the annular strip and communicating with the adjustment cavity are fixedly connected to the hydraulic tank.

[0018] The hydraulic tank, connecting pipe, and regulating chamber are all filled with liquid medium, and the volume of the hydraulic tank is greater than the volume of the regulating chamber.

[0019] Preferably, the second detection element and the first detection element are symmetrically arranged along the axis of the stator. The second detection element is a phase change material, which can deform under the action of temperature and drive the piston shaft and piston plate to move in the hydraulic tank, so that the liquid medium drives the two elastic elements to contract or expand to change the volume of the central cavity.

[0020] The elastic element includes two connecting pieces that are fixedly connected to the annular bar and coaxially arranged, and a movable ring is fixedly connected to one end of the two connecting pieces away from the annular bar.

[0021] Preferably, each of the two movable rings is provided with a baffle on one side of the central cavity. The baffle and the adjacent air inlet pipe form a shielding cooperation. When the two movable rings approach each other under the drive of the liquid medium, the baffle can shield the air outlet of the adjacent air inlet pipe.

[0022] The beneficial effects of this invention are:

[0023] This invention, through the configuration of adjustment components, flow guide cavities, flow guide elements, and annular waist plates, utilizes a first detection element to directly sense and respond to the temperature in the middle of the stator. When the temperature in this area rises, the first detection element undergoes a phase change and drives the adjustment element to work, causing the flow guide plate to move towards the outlet end of the heat exchange channel. This guides more of the low-temperature gas that has undergone heat exchange into the flow guide cavity and subsequent passages, achieving dynamic distribution of the cooling medium. This improves problems such as poor motor heat dissipation caused by lag in the cooling system response and the inability of fixed flow paths to adjust for hot spots. Furthermore, utilizing the Venturi effect, when the cooling medium flows through the waist area formed by the annular waist plate, the flow velocity increases and the static pressure decreases. This causes more of the low-temperature gas in the annular cavity to be drawn into the mainstream of the heat exchange gap under the action of pressure difference, forming a strong jet flow. This flow not only directly impacts and destroys the high-temperature boundary layer on the stator surface, enhancing the heat exchange intensity, but its strong mixing with the mainstream also significantly improves the uniformity of the temperature field, allowing heat to be carried away more efficiently. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of a high-voltage asynchronous motor cooling and ventilation system according to the present invention.

[0025] Figure 2 This is a schematic planar cross-sectional view of a high-voltage asynchronous motor cooling and ventilation system according to the present invention.

[0026] Figure 3 This is a schematic cross-sectional view of the cooling and ventilation system of the present invention from another angle.

[0027] Figure 4 for Figure 2 A magnified view of a portion of point A in the middle.

[0028] Figure 5 This is a cross-sectional schematic diagram showing the cooperation between the auxiliary hydraulic cylinder and the main hydraulic cylinder of the present invention.

[0029] Figure 6 This is a schematic cross-sectional view of the auxiliary hydraulic cylinder of the present invention.

[0030] Figure 7 for Figure 6 A magnified view of a portion of point C.

[0031] Figure 8 This is a schematic diagram showing the cooperation between the annular waist plate and the limiting plate of the present invention.

[0032] Figure 9 for Figure 2 A magnified view of a portion of point B in the middle.

[0033] The attached figures are labeled as follows:

[0034] 1. Shell; 11. Equipment cavity; 12. Heat exchange cavity; 13. Heat exchange channel; 14. Stator; 15. Support frame; 16. Heat exchange gap; 17. Limiting block; 18. Annular plate;

[0035] 2. Heat exchange components;

[0036] 3. Flow guide cavity; 31. Flow guide component; 32. Inlet pipe; 33. Auxiliary plate; 34. Angled hole;

[0037] 4. Adjustment assembly; 41. First detection element; 42. Adjustment element; 421. Main hydraulic cylinder; 422. First piston rod; 423. Secondary hydraulic cylinder; 424. Second piston rod; 425. Guide wheel;

[0038] 5. Circular waistband;

[0039] 6. Adjusting mechanism; 61. Second detection piece; 62. Annular bar; 63. Central cavity; 64. Elastic element; 641. Connecting piece; 642. Movable ring; 65. Adjusting cavity; 66. Actuator; 661. Hydraulic tank; 662. Piston shaft; 663. Connecting pipe;

[0040] 7. Baffle. Detailed Implementation

[0041] 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.

[0042] Example 1

[0043] Due to factors such as limitations in the installation method of the stator and motor housing, uneven distribution of cooling medium flow, and heat attenuation, the actual heat dissipation effect in the middle area of ​​the stator is still not ideal, and the temperature is often maintained at around 110℃. Frequent or heavy-load starts of the motor will further exacerbate this problem. This is because the current during motor start-up can reach 5-7 times the rated value, generating a huge instantaneous thermal shock. The response of the cooling system often has inertia, and it takes time for the fan to establish stable air pressure and flow. However, heat is already rapidly generated in the middle. Frequent and heavy-load starts cause heat to accumulate continuously in the middle, which cannot be dissipated in time, making the problem of temperature rise in the middle more prominent.

[0044] Furthermore, even if a stable air pressure and flow rate have been established inside the motor, the installation method of the stator and the housing restricts the flow direction of the cooling medium. That is, the cooling medium can only pass through the gap between the rotor and the stator, and only a very small part will directly act on the outer circumference of the stator. This makes it impossible for the cooling system to effectively dissipate heat from the middle of the stator. When the temperature in the middle of the stator is significantly higher than that at the end of the stator, the existing technology is also unable to make adaptive adjustments for this area.

[0045] This embodiment was invented to solve the above problems.

[0046] Please see Figures 1 to 9 As shown, a high-voltage asynchronous motor cooling and ventilation system according to an embodiment of the present invention includes a housing 1, an equipment cavity 11 and a heat exchange cavity 12, and a heat exchange assembly 2. In this embodiment, the heat exchange assembly 2 includes multiple staggered plates spaced apart, and multiple uniformly distributed heat exchange tubes are installed on the staggered plates. A draft fan matching the heat exchange tubes is provided on one side of the housing 1, which can introduce low-temperature gas from outside the motor into the multiple heat exchange tubes. An exhaust fan corresponding to the draft fan is provided on the other side of the housing 1, and the gas after heat exchange is discharged from the exhaust fan. The above process is the external air duct system of the motor. The draft fan and the exhaust fan are existing technologies and will not be described in detail here. Heat exchange channels 13 are formed inside the heat exchange cavity 12 by the heat exchange assembly 2. A rotor and a stator 14 are provided inside the equipment cavity 11. A rotating shaft coaxially arranged with the rotor is provided inside the equipment cavity 11, and the rotating shaft is close to the heat exchange. A centrifugal fan is installed on one side of the inlet end of channel 13. When the centrifugal fan rotates, it can guide the gas in the equipment cavity 11 into the heat exchange channel 13. Under its continuous action, the gas can flow in an "S" shape along the heat exchange channel 13, so that the gas in the equipment cavity 11 can fully exchange heat with the low temperature gas inside through the contact heat exchange tube. When the gas after heat exchange is ejected from the outlet end of the heat exchange channel 13, the temperature reaches the minimum. A support frame 15 matching the stator 14 is installed on the inner wall of the equipment cavity 11. Multiple circumferentially distributed limiting blocks 17 matching the circumferential side of the stator 14 are installed on the support frame 15. A heat exchange gap 16 is formed between the stator 14 and the support frame 15. The gas after heat exchange can not only pass through the gap between the rotor and the stator 14, but also pass through the heat exchange gap 16 under the action of air pressure. When the low temperature gas passes through the heat exchange gap 16, it will dissipate heat and cool the outer circumferential side of the stator 14.

[0047] Furthermore, a flow guide cavity 3 is provided in the heat exchange cavity 12 below the heat exchange channel 13. A flow guide 31 corresponding to the outlet end of the heat exchange channel 13 is provided in the flow guide cavity 3. The flow guide 31 can guide part of the low temperature gas at the outlet end of the heat exchange channel 13 into the flow guide cavity 3. An adjustment component 4 is provided in the equipment cavity 11 on the outer circumference side of the stator 14. The adjustment component 4 includes a first detection element 41 located in the limiting plate and close to the flow guide cavity 3. An adjustment element 42 is provided between the first detection element 41 and the flow guide cavity 3. The adjustment element 42 can adjust the flow rate of the heat exchange medium in the heat exchange gap 16 under the action of the first detection element 41.

[0048] Please see Figures 2 to 7 As shown, an annular plate 18 is provided inside the support frame 15, and an annular cavity is formed between the annular plate 18 and the support frame 15. The adjusting component 42 includes a main hydraulic cylinder 421 that penetrates the support frame 15 into the guide cavity 3. The main hydraulic cylinder 421 is internally sealed and slidably connected to a first piston rod 422. An installation groove is provided on the inner wall of the guide cavity 3. Two symmetrically arranged auxiliary hydraulic cylinders 423 are provided in the installation groove. The two auxiliary hydraulic cylinders 423 are internally sealed and slidably connected to second piston rods 424 respectively. The main hydraulic cylinder 421 and the two auxiliary hydraulic cylinders 423 are connected by a pipe. The guide component 31 includes a guide plate fixedly connected to the two second piston rods 424. In this embodiment, the guide plate includes an arc-shaped plate located at the outlet end of the heat exchange channel 13. A connecting plate located in the heat exchange cavity 12 is fixedly connected to one side of the arc-shaped plate. Multiple guide wheels 425 located inside the installation groove are provided at the bottom of the guide plate. The guide wheels 425 can reduce friction and assist the movement of the guide plate. It should be noted that the connecting plate and the guide cavity 3 are clearance-fitted.

[0049] Please see Figure 4 As shown, the first detection element 41 is located in the middle of the circumferential side of the stator 14. The first piston rod 422 is fixedly connected to the first detection element 41, and the first detection element 41 is made of phase change material. In this embodiment, the first detection element 41 is made of shape memory alloy. The surface of the shape memory alloy forms a surface contact with the circumferential side of the stator 14. When the temperature in the middle of the stator 14 rises significantly, the shape memory alloy will induce a phase change, causing the first piston rod 422 to move under the push of the first detection element 41 and the hydraulic oil in the main hydraulic cylinder 421 to enter the two auxiliary hydraulic cylinders 423. The second piston rod 424 pushes the guide plate to move towards the side closer to the outlet end of the heat exchange channel 13 under hydraulic drive. Conversely, when the temperature in the middle of the stator 14 decreases, the guide plate resets. During this process, the amount of movement of the guide plate will be dynamically adjusted according to the temperature change in the middle region of the stator 14.

[0050] Furthermore, the flow guide cavity 3 is provided with multiple air inlet pipes 32, the outlet end of the air inlet pipe 32 passes through the annular plate 18 into the annular cavity, and an auxiliary plate 33 matching the flow guide plate is provided in the annular cavity. The auxiliary plate 33 can guide the cooling medium in the annular cavity into the air inlet pipe 32. Multiple oblique holes 34 are opened on the inner wall of the annular cavity, which penetrate into the heat exchange gap 16. In this embodiment, when the gas is ejected from the oblique holes, its ejection direction is basically the same as the direction of gas flow in the heat exchange gap 16, and the angle between the two movement directions is an acute angle.

[0051] Furthermore, since the outlet ends of heat exchange assembly 2 and heat exchange channel 13 are both located above stator 14, uneven flow distribution inevitably occurs when gas flows through heat exchange gap 16 and enters the annular cavity, resulting in a certain degree of temperature difference in the radial direction of stator 14. To avoid this problem, the angle between the extended axis of the outlet end of inlet pipe 32 and the center line of stator 14 is acute. Figure 3 As shown, multiple air inlet pipes 32 located on both sides of the main hydraulic cylinder 421 are symmetrically arranged along the center line of the stator 14. When gas enters the annular cavity through the air inlet pipe 32, it will directly impact the arc surface of the support frame 15 and change the flow direction of the gas, so that more gas can flow towards the bottom of the stator 14, minimizing the problem of uneven flow distribution.

[0052] Additionally, please see Figure 3 As shown, the outlet end of the intake pipe 32 is not only located above the stator 14, but also part of the outlet end of the intake pipe 32 is located in the area below the stator 14, so that some of the gas in the guide cavity 3 that has not been heat exchanged flows directly into the middle and lower area of ​​the annular cavity, further improving the heat dissipation uniformity of the stator 14 in the radial direction.

[0053] To further improve the heat dissipation efficiency of the gas to the stator 14, an annular waist plate 5 is provided on the inner wall of the support frame 15, located in the middle of the circumference of the stator 14. The diameter of the heat exchange gap 16 in the area of ​​the annular waist plate 5 is smaller than the diameter of the heat exchange gap 16 at both ends of the stator 14. The two sides of the annular waist plate 5 are chamfered.

[0054] When in use, after the motor starts, the centrifugal fan and the induced draft fan on the shaft work synchronously. When the centrifugal fan rotates, it can guide the gas in the equipment cavity 11 to the heat exchange channel 13. When the induced draft fan is working, the low-temperature gas outside the motor can enter multiple heat exchange tubes. After the gas in the heat exchange channel 13 and the low-temperature gas in the heat exchange tubes have fully exchanged heat, it is ejected from the outlet end of the heat exchange channel 13.

[0055] When the motor starts, the magnetic field distribution in the central region of the stator core 14 is the most uniform and has the highest intensity, resulting in the greatest core loss and consistently higher temperature in this region compared to other parts. Therefore, as the temperature in this region gradually increases, the first detection element 41 undergoes a phase change due to the temperature change, which in turn generates a large pushing force on the first piston rod 422, causing the first piston rod 422 to move within the main hydraulic cylinder 421. This causes the liquid medium in the main hydraulic cylinder 421 to enter the interior of the two auxiliary hydraulic cylinders 423 through the pipe. Under the push of the liquid medium, the two second piston rods 424 push the guide plate to move towards the side closer to the outlet end of the heat exchange channel 13, thereby allowing more low-temperature gas to enter the guide cavity 3 under the action of the guide plate. The auxiliary plate 33 can guide the low-temperature gas into multiple air inlets, so that the low-temperature gas enters the annular cavity and is ejected from the inclined hole 34. The ejected gas mixes with the mainstream gas in the heat exchange gap 16, improving the heat exchange efficiency of the stator 14.

[0056] Furthermore, since the inner wall of the support frame 15 is provided with an annular waist plate 5 located in the middle of the circumference of the stator 14, the diameter of the heat exchange gap 16 in the annular waist plate 5 region is smaller than the diameter of the heat exchange gap 16 at both ends of the stator 14. The two sides of the annular waist plate 5 are chamfered. This configuration forms a waist region in the middle of the heat exchange gap 16. According to Bernoulli's law and the Venturi effect, when the cooling medium flows through the waist region, the flow velocity will increase due to the sudden reduction of the flow cross section. At the same time, the static pressure value in this region will decrease, forming a local low-pressure area. Since the oblique hole 34 is opened on the inner wall of the waist region, and the inlet of the oblique hole 34 is... The end is connected to the annular cavity. Under the action of the Venturi effect, the gas in the annular cavity will be drawn into the mainstream of the heat exchange gap 16 more under the action of the pressure difference inside and outside the inclined hole 34, forming an additional jet gas flow. This gas flow mixes and disturbs with the mainstream gas, which can effectively destroy the thermal boundary layer on the circumferential side of the stator 14, allowing more areas of the wall to directly contact the low-temperature gas flow, thereby improving the heat exchange efficiency of the stator 14. At the same time, the jet gas flow of the inclined hole 34 promotes the turbulence of the fluid in the pipe, enhances the overall mixing ability of the cooling gas flow, makes the temperature distribution more uniform, and reduces the risk of local overheating.

[0057] In summary, this invention, through the adjustment of the component 4, the flow guide cavity 3, the flow guide 31, and the annular waist plate 5, utilizes the direct sensing and response of the first detection element 41 to the temperature in the middle of the stator 14. When the temperature in this area rises, the first detection element 41 undergoes a phase change and drives the adjustment element 42 to work, causing the flow guide plate to move towards the outlet end of the heat exchange channel 13. This guides more low-temperature gas that has undergone heat exchange to the flow guide cavity 3 and subsequent passages, achieving dynamic distribution of the cooling medium. This improves the problems of poor motor heat dissipation caused by the lag in the cooling system response and the inability of the fixed flow path to adjust for hot spots.

[0058] Furthermore, utilizing the Venturi effect, when the cooling medium flows through the waist region formed by the annular waist plate 5, the flow velocity increases and the static pressure decreases, causing the low-temperature gas in the annular cavity to be drawn into the mainstream of the heat exchange gap 16 under the action of pressure difference, forming a strong jet airflow. This airflow not only directly impacts and destroys the high-temperature boundary layer on the surface of the stator 14, enhancing the heat transfer intensity, but its strong mixing with the mainstream also significantly improves the uniformity of the temperature field, allowing heat to be carried away more efficiently.

[0059] Example 2

[0060] In actual use, it was found that, relying solely on the arrangement of the intake pipe 32 and the inclined setting of its outlet end, there is still a certain degree of temperature difference on the radial direction of the circumferential side of the stator 14. Moreover, this temperature difference changes dynamically during motor operation, and the fixed airflow channel setting is difficult to match this change in real time. Therefore, this embodiment makes further improvements based on the above embodiment.

[0061] Please see Figures 2 to 9 As shown, a radial adjustment mechanism 6 is provided at the bottom of the device cavity 11, which includes a second detection element 61 disposed in the corresponding limiting block 17. Two symmetrically arranged annular bars 62 are disposed in the annular cavity, and the two annular bars 62 divide the middle of the annular cavity into a central cavity 63. An elastic element 64 is disposed on the opposite side of the two annular bars 62, and an adjustment cavity 65 is formed between the elastic element 64 and the annular bars 62. An actuator 66 matching the second detection element 61 is provided at the bottom of the device cavity 11. The actuator 66 can cause the elastic element 64 to expand or contract under the action of the second detection element 61, so as to change the volume of the central cavity 63.

[0062] The actuator 66 includes a hydraulic tank 661 fixedly connected to the equipment cavity 11. A piston plate is slidably connected inside the hydraulic tank 661. A piston shaft 662 fixedly connected to the second detection element 61 is fixedly connected to the piston plate. Multiple connecting pipes 663 fixedly connected to the annular bar 62 and communicating with the adjustment cavity 65 are fixedly connected to the hydraulic tank 661.

[0063] It should be added that the hydraulic tank 661, the connecting pipe 663 and the regulating cavity 65 are all filled with liquid medium, and the volume of the hydraulic tank 661 is larger than the volume of the regulating cavity 65. When the second detection element 61 deforms under temperature change and pushes the piston shaft 662 and the piston plate to move, the movement of the piston plate can be amplified under the volume difference, making the deformation of the elastic element 64 more obvious.

[0064] Furthermore, the second detection element 61 and the first detection element 41 are symmetrically arranged along the axis of the stator 14. The second detection element 61 is a phase change material, which can deform under the action of temperature and drive the piston shaft 662 and the piston plate to move in the hydraulic tank 661, so that the liquid medium drives the two elastic elements 64 to contract or expand to change the volume of the central cavity 63. In this embodiment, the material of the second detection element 61 is the same as that of the first detection element 41.

[0065] The elastic element 64 includes two connecting pieces 641 that are fixedly connected to the annular bar 62 and coaxially arranged. The ends of the two connecting pieces 641 away from the annular bar 62 are fixedly connected to a movable ring 642. In this embodiment, the connecting pieces 641 are made of rubber or flexible material. The movable ring 642 is in sliding fit with the inner wall of the central cavity 63. If necessary, grease can also be applied to this area. When the liquid medium in the hydraulic tank 661 is squeezed into the regulating cavity 65, the two connecting pieces 641 deform. This not only pushes the two movable rings 642 closer to each other to adjust the volume in the central cavity 63, but also makes the outer wall fit tightly against the inner wall of the central cavity 63 during the deformation process, thus avoiding wasteful leakage of gas in the central cavity 63.

[0066] Each of the two movable rings 642 is provided with a baffle 7 on one side of the central cavity 63. The baffle 7 forms a shielding cooperation with the adjacent air inlet pipe 32. When the two movable rings 642 approach each other under the drive of the liquid medium, the baffle 7 can shield the air outlet of the adjacent air inlet pipe 32.

[0067] Based on the above embodiments, during use, when the temperature in the middle region of the stator 14 gradually increases and causes the second detection element 61 to undergo a phase change, the piston shaft 662 and the piston plate move downward under the action of the second detection element 61 and squeeze the liquid medium in the hydraulic tank 661. The liquid medium enters the corresponding adjustment chamber 65 through multiple connecting pipes 663. The two elastic elements 64 extend under hydraulic action, causing the two movable rings 642 to move closer to each other. At this time, the volume in the central cavity 63 decreases. When the low-temperature gas in the guide cavity 3 enters the central cavity 63 through the air inlet pipe 32, the volume in the central cavity 63 decreases, thereby increasing its internal air pressure and improving the uniformity of the distribution of low-temperature gas in the radial region of the stator 14.

[0068] Furthermore, when the two movable rings 642 approach each other, the baffle 7 can block part of the air inlet pipes 32 located on both sides of the main hydraulic cylinder 421, reducing their air inlet flow rate. This allows more low-temperature gas in the guide cavity 3 to be discharged from the air inlet pipes 32 at the two edges of the stator 14. This not only further reduces the radial temperature difference of the stator 14, but also increases the gas flow velocity through the blocked part of the air inlet pipe 32 because the outlet cross-sectional area is reduced while the inlet cross-sectional area remains unchanged, thus further improving the heat exchange efficiency.

[0069] In summary, this invention, through the radial adjustment mechanism 6, the elastic element 64, and the baffle 7, enables the second detection element 61 to sense the area with the greatest temperature change when a temperature difference occurs in the stator 14 in the radial direction. This element deforms under the temperature change, driving the piston plate in the hydraulic tank 661 to move, pressing the liquid medium into the adjustment chamber 65. This causes the elastic element 64 to deform, allowing the volume of the central cavity 63 to be adjusted in real time according to temperature feedback. This changes the internal air pressure and actively guides the cooling airflow to preferentially flow to the higher temperature area, effectively compensating for the uneven airflow distribution caused by the fixed structure.

[0070] Furthermore, by bringing the two movable rings 642 closer together, the baffle 7 gradually blocks part of the intake pipe 32. The flow rate of the blocked intake pipe 32 decreases, while the intake pipes 32 at both ends of the stator 14 that are not blocked receive relatively more airflow. This not only encourages the cooling medium to actively flow to the area with more urgent heat dissipation needs, improving the temperature uniformity of the stator 14 in the circumferential direction, but also increases the gas velocity flowing through it due to the reduced outlet cross-sectional area of ​​the blocked intake pipe 32. According to the principles of fluid mechanics, the higher velocity can disrupt the thermal boundary layer, thereby locally enhancing the heat transfer efficiency and preventing the problem of rapid temperature rise in this area due to the reduced flow rate of the cooling medium.

[0071] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A cooling and ventilation system for a high-voltage asynchronous motor, comprising a housing, wherein the housing contains an equipment cavity and a heat exchange cavity, characterized in that, The heat exchange cavity is provided with heat exchange components, and heat exchange channels are formed inside the heat exchange cavity by the heat exchange components. The equipment cavity is provided with a rotor and a stator. The inner wall of the equipment cavity is provided with a support frame that matches the stator. The support frame is provided with a plurality of circumferentially distributed limiting blocks that match the circumferential side of the stator. A heat exchange gap is formed between the stator and the support frame. The heat exchange cavity is provided with a flow guide cavity located below the heat exchange channel. The flow guide cavity is provided with a flow guide corresponding to the outlet end of the heat exchange channel. The equipment cavity is provided with an adjustment assembly located on the circumferential side of the stator. The adjustment assembly includes a first detection element located inside the limiting plate and close to the flow guide cavity. An adjustment element is provided between the first detection element and the flow guide cavity. The adjustment element can adjust the flow rate of the heat exchange medium in the heat exchange gap under the action of the first detection element.

2. The high-voltage asynchronous motor cooling and ventilation system according to claim 1, characterized in that, An annular plate is provided inside the support frame, and an annular cavity is formed between the annular plate and the support frame. The adjusting component includes a main hydraulic cylinder that penetrates the support frame and extends into the guide cavity. A first piston rod is slidably connected to the inside of the main hydraulic cylinder. An installation groove is provided on the inner wall of the guide cavity. Two symmetrically arranged auxiliary hydraulic cylinders are provided in the installation groove. A second piston rod is slidably connected to the inside of each of the two auxiliary hydraulic cylinders. The main hydraulic cylinder and the two auxiliary hydraulic cylinders are connected by a pipe. The guide component includes a guide plate that is fixedly connected to the two second piston rods. Multiple guide wheels located inside the installation groove are provided at the bottom of the guide plate.

3. The high-voltage asynchronous motor cooling and ventilation system according to claim 2, characterized in that, The first detection element is located at the middle of the stator circumference side, the first piston rod is fixedly connected to the first detection element, and the first detection element is made of phase change material; When the first detection element deforms at high temperature, the first piston rod moves under the push of the first detection element and causes the hydraulic oil in the main hydraulic cylinder to enter the two auxiliary hydraulic cylinders. The second piston rod pushes the guide plate to move towards the side closer to the outlet end of the heat exchange channel under hydraulic drive. Conversely, the guide plate resets.

4. The high-voltage asynchronous motor cooling and ventilation system according to claim 1, characterized in that, The flow guide cavity is provided with multiple air inlet pipes, and the outlet end of the air inlet pipes passes through the annular plate into the annular cavity. An auxiliary plate matching the flow guide plate is provided in the annular cavity. The auxiliary plate can guide the cooling medium in the annular cavity into the air inlet pipes. Multiple oblique holes penetrating into the heat exchange gap are opened on the inner wall of the annular cavity.

5. A high-voltage asynchronous motor cooling and ventilation system according to claim 4, characterized in that, The angle between the extended axis of the outlet end of the air inlet pipe and the center line of the stator is an acute angle, and multiple air inlet pipes located on both sides of the main hydraulic cylinder are symmetrically arranged along the center line of the stator.

6. A high-voltage asynchronous motor cooling and ventilation system according to claim 1, characterized in that, The inner wall of the support frame is provided with an annular waist plate located in the middle of the stator circumference. The heat exchange gap diameter of the annular waist plate area is smaller than the heat exchange gap diameter of the stator end areas.

7. A high-voltage asynchronous motor cooling and ventilation system according to claim 2, characterized in that, The bottom of the device cavity is provided with a radial adjustment mechanism, which includes a second detection element disposed within a corresponding limiting block. Two symmetrically arranged annular bars are disposed within the annular cavity, and the two annular bars separate the middle part of the annular cavity into a central cavity. An elastic element is disposed on one side opposite to the two annular bars, and an adjustment cavity is formed between the elastic element and the annular bars. An actuator matching the second detection element is disposed at the bottom of the device cavity. The actuator can expand or contract the elastic element under the action of the second detection element to change the volume of the central cavity.

8. A high-voltage asynchronous motor cooling and ventilation system according to claim 7, characterized in that, The actuator includes a hydraulic tank fixedly connected to the equipment cavity, a piston plate is slidably connected inside the hydraulic tank, a piston shaft fixedly connected to the second detection element is fixedly connected to the piston plate, and multiple connecting pipes fixedly connected to the annular bar and communicating with the adjustment cavity are fixedly connected to the hydraulic tank. The hydraulic tank, connecting pipe, and regulating chamber are all filled with liquid medium, and the volume of the hydraulic tank is greater than the volume of the regulating chamber.

9. A high-voltage asynchronous motor cooling and ventilation system according to claim 8, characterized in that, The second detection element is symmetrically arranged with the first detection element along the axis of the stator. The second detection element is a phase change material, which can deform under the action of temperature and drive the piston shaft and piston plate to move in the hydraulic tank, so that the liquid medium drives the two elastic elements to contract or expand to change the volume of the central cavity. The elastic element includes two connecting pieces that are fixedly connected to the annular bar and coaxially arranged, and a movable ring is fixedly connected to one end of the two connecting pieces away from the annular bar.

10. A high-voltage asynchronous motor cooling and ventilation system according to claim 9, characterized in that, Both of the movable rings are provided with baffles on one side of the central cavity. The baffles form a shielding cooperation with the adjacent air inlet pipe. When the two movable rings approach each other under the drive of the liquid medium, the baffles can shield the air outlet of the adjacent air inlet pipe.

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