APF active power filter with high heat dissipation function

Abstract

The invention relates to the field of active power filters, and discloses an APF active power filter with a high heat dissipation function, the APF active power filter comprises a filter body and a heat dissipation assembly, the heat dissipation assembly comprises a heat conduction unit, a liquid storage unit and an air cooling unit, the heat conduction unit comprises a heat conduction box, the interior of the heat conduction box is hollow, and an inlet hole and an outlet hole are formed in the upper surface of the heat conduction box; an outlet pipe is arranged at the upper orifice of the outlet hole, an inlet pipe is arranged at the upper orifice of the inlet hole, the pipe wall of the inlet pipe is divided into two sections which are coaxial and unequal in diameter along the axial lead direction, the two sections are respectively an upper section and a lower section, the pipe diameter of the upper section is larger than that of the lower section, so that a step surface is formed, and a core pipe is arranged at the cavity bottom of the heat conduction box; the upper end of the core pipe is closed and located in the lower section of the inlet pipe, a piston is sleeved with the core pipe, a thermal expansion medium is stored in the space below the piston, a connecting rod is arranged on the upper surface of the piston, the upper end of the connecting rod extends out of the core pipe and is provided with a sealing plate, a spring is arranged between the piston and the upper end of the core pipe, and the sealing plate is attached to the step face at the beginning.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of active power filter, in particular to the field of heat dissipation of active power filter, and specifically to an APF active power filter with high heat dissipation function. BACKGROUND

[0002] The active power filter (APF) is one of the core devices of modern power quality management, mainly used for dynamic suppression of harmonics, compensation of reactive power and unbalanced current. When it is running, a large amount of heat will be generated, so a heat dissipation system is needed to dissipate heat and ensure the stability of its operation.

[0003] Based on the search of active power filter heat dissipation, a Chinese utility model patent was found, with the authorization announcement number CN208539570U, which discloses a liquid-cooled active power filter, which takes away the heat generated by each power device through the cooling liquid circulation loop. Although it realizes effective liquid cooling heat dissipation, it still has some deficiencies, specifically: the heat generated by different parts of the active power filter is very different, for example, the core heat source is the power unit, the secondary heat source is the reactor, and the weak heat source is the DC side capacitor, so the heat generated by different parts of the active power filter is different, and the heat dissipation capacity required is also different. In addition, in different working environments, the heat generated by the same part is also different, but the heat dissipation performance of the heat dissipation system is fixed, which is prone to problems of excessive heat dissipation or insufficient heat dissipation in time. The former will lead to energy waste and increase the operating cost, and the latter is prone to heat accumulation and high-temperature operating environment.

[0004] Based on the above problems, the present application provides an APF active power filter with high heat dissipation function. SUMMARY

[0005] To solve the problems mentioned in the above background, the present application provides an APF active power filter with high heat dissipation function.

[0006] To achieve the above technical purpose, the technical scheme adopted by the present application is as follows.

[0007] An APF active power filter with high heat dissipation function, comprising a filter body and a heat dissipation assembly for dissipating heat of the filter body, the heat dissipation assembly comprising a heat conduction unit, a liquid storage unit and an air cooling unit. The heat conduction unit comprises a heat conduction box, the inside of the heat conduction box is hollow, and the upper surface is provided with an inlet hole and an outlet hole, the upper hole of the outlet hole is provided with an outlet pipe, the upper hole of the inlet hole is provided with an inlet pipe, the pipe wall of the inlet pipe is divided into two coaxial sections of different diameters along the axial line direction and is respectively an upper section and a lower section, the diameter of the upper section is larger than that of the lower section, and a step surface is formed at the connection between the two sections. A core pipe is arranged at the middle position of the cavity bottom of the heat conduction box, the upper end of the core pipe is closed and coaxially arranged in the lower section of the inlet pipe, a piston is sleeved in the core pipe, the space below the core pipe stores heat expansion medium, the upper surface of the piston is provided with a connecting rod, the upper end of the connecting rod extends out of the core pipe and is provided with a sealing plate, a spring is arranged between the piston and the upper end of the core pipe, and the lower surface of the sealing plate is initially attached to the stepped surface.

[0008] As a further improvement and optimization of the application, a convex pipe is arranged at the lower hole of the inlet hole, the lower pipe of the convex pipe is provided with a partition plate, the partition plate is provided with a communication hole communicated with the convex pipe, and the partition plate is provided with an avoiding hole for avoiding the core pipe.

[0009] As a further improvement and optimization of the application, the heat conduction unit is provided with a plurality of and is correspondingly distributed at each heat generating part of the filter body according to the actual layout of the electronic components in the filter body.

[0010] As a further improvement and optimization of the application, the liquid storage unit includes a liquid storage tank, and a side pipe one and a side pipe two are arranged in the liquid storage tank. One end of the side pipe one is located in the liquid storage tank and close to the upper end of the liquid storage tank, the other end of the side pipe one extends out of the liquid storage tank and is provided with a pipeline one, and the pipeline one is connected with the inlet pipe. One end of the side pipe two is located in the liquid storage tank and close to the lower end of the liquid storage tank, the other end of the side pipe two extends out of the liquid storage tank and is provided with a pipeline three, and a one-way valve is arranged at the connection position of the pipeline three and the side pipe two, and the one-way valve is used for allowing the fluid to flow into the side pipe two from the pipeline three in one direction.

[0011] As a further improvement and optimization of the application, the air cooling unit includes an outer shell, and the two ends of the outer shell are open and connected with two air vents arranged on the shell of the filter body. A motor is arranged in the outer shell, a fan shaft is coaxially arranged at the output end of the motor, the fan shaft is in the shape of a hollow shaft, a pipeline four is connected with the tail end of the fan shaft through a rotary joint. A plurality of centrifugal blades are arranged on the outer circular surface of the fan shaft in the circumferential direction, a fan is arranged outside the fan shaft, and the fan is located on the side away from the motor.

[0012] As a further improvement and optimization of the application, a fixing ring is coaxially arranged around the fan shaft, the inner ring surface of the fixing ring is connected with the side away from the fan shaft of the centrifugal blade, the centrifugal blade is hollow inside, the outer circular surface of the fan shaft is provided with a side hole communicated with the centrifugal blade, and the outer ring surface of the fixing ring is provided with a centrifugal hole communicated with the centrifugal blade. The outer circular surface of the fixing ring is provided with a plurality of annular side inner fins arranged along the axis of the fixing ring, and the two side inner fins located at the two sides in the array direction are respectively close to the two end surfaces of the fixing ring. The outer ring surface of the side inner fins is coaxially provided with side outer fins, and the outer ring surfaces of all the side outer fins are provided with a closed ring.

[0013] As a further improvement and optimization of the application, the outer ring surface of the closed ring is provided with main fins.

[0014] As a further improvement and optimization of the application, the end surface of the side outer fin is provided with a notch, the upper orifice of the notch of the uppermost side outer fin is blocked, the lower end surface of the closed ring is provided with a liquid receiving hopper, and the outer surface of the liquid receiving hopper is connected with a ring pipe.

[0015] As a further improvement and optimization of the application, the end of the third pipe is connected with the ring pipe, and the end of the fourth pipe is provided with the second pipe, and the second pipe is connected with the outlet pipe.

[0016] Compared with the prior art, the application has the following beneficial effects: I. It needs to be pointed out that different heating parts of the filter body produce different heat, and the optimal working temperature range is also different, which is not described in the prior art. On the one hand, for a single heat conduction unit, the opening size of the liquid flow supply pipe is controlled by the thermal expansion medium, the more heat generated by the heating part, the larger the opening for the liquid flow, and the more liquid participating in the flow, thereby achieving the purpose of self-adaptive heat dissipation. On the one hand, for a plurality of heat conduction units, the spring force coefficient is changed to adjust the distribution amount of the liquid flow, and the optimal working temperature of the heating part is lower, and the spring force coefficient of the corresponding heat conduction unit is smaller, thereby ensuring that each heating part can be as close to the optimal working temperature as possible, and the working performance of the filter body can be improved.

[0017] II. The centrifugal blade is provided, on the one hand, to achieve the basic cooling liquid circulation function, on the other hand, the faster the speed, the faster the cooling liquid flow speed, and the higher the heat dissipation efficiency, on the other hand, the periphery of the centrifugal blade is connected with a plurality of side inner fins and side outer fins, and the cooling liquid absorbing heat can be thrown out by centrifugal force, spread on the side inner fins or side outer fins, realize high-efficiency heat exchange, thereby improving the heat dissipation effect of the air cooling on the cooling liquid, and improving the overall heat dissipation effect of the filter body. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Structure diagram of the application Figure 1 ; Figure 2 Structure diagram of the application Figure 2 ; Figure 3 Structure diagram of the heat dissipation assembly Figure 4is a sectional view of the heat conduction unit; Figure 5 is a sectional view of the liquid storage unit; Figure 6 is a structural schematic view of the air cooling unit; Figure 7 is an internal schematic view of the air cooling unit; Figure 8 is a sectional view of the air cooling unit; Figure 9 is a partial sectional view of the air cooling unit; Figure 10 is a schematic view of the centrifugal blade, the fixed ring and the fan shaft.

[0019] The reference signs in the drawings are as follows: 100, filter body; 200, heat dissipation assembly; 201, heat conduction unit; 202, liquid storage unit; 2021, liquid storage tank; 2022, side pipe one; 2023, side pipe two; 2024, one-way valve; 203, air cooling unit; 204, pipe one; 205, pipe two; 206, pipe three; 207, heat conduction box; 208, inlet pipe; 209, convex pipe; 210, partition plate; 211, outlet pipe; 212, core pipe; 213, piston; 214, connecting rod; 215, spring; 216, sealing plate; 217, outer shell; 218, motor; 219, fan shaft; 220, centrifugal blade; 221, fan; 222, pipe four; 223, main fin; 224, ring pipe; 225, side outer fin; 226, notch; 227, side inner fin; 228, liquid receiving hopper; 229, fixed ring; 230, centrifugal hole. DETAILED DESCRIPTION

[0020] In order to further explain the technical means and effects adopted by the present application to achieve the predetermined object of the present application, the specific embodiments, structures, features and effects according to the present application are described in detail as follows in combination with the drawings and preferred embodiments.

[0021] Referring to Figure 1 and Figure 2 The APF active power filter with high heat dissipation function comprises a filter body 100 and a heat dissipation assembly 200 for dissipating heat of the filter body 100.

[0022] Referring to Figure 3The heat dissipation assembly 200 comprises a heat conduction unit 201, a liquid storage unit 202 and an air cooling unit 203, wherein the heat conduction unit 201 is provided with a plurality of heat conduction units and is distributed at the heat generating parts according to the actual layout in the filter body 100, absorbs the heat at the heat generating parts, the liquid storage unit 202 stores the cooling liquid, the air cooling unit 203 is used for forming a circulating flow among the three and dissipating the heat of the cooling liquid outwardly, so that the liquid cooling heat dissipation of the filter body 100 is realized. Compared with the existing conventional liquid cooling heat dissipation technology, the liquid cooling heat dissipation of the present scheme can adjust and distribute the heat dissipation performance according to the actual situation of each heat generating part of the filter body 100, maximize the play of the heat dissipation performance, which will be described in detail below.

[0023] With reference to Figure 4 The heat conduction unit 201 is made of a heat conduction material, for example, copper, which comprises a heat conduction box 207, the inside of the heat conduction box 207 is hollow and the upper surface is provided with an inlet hole and an outlet hole, The upper hole of the outlet hole is provided with an outlet pipe 211.

[0024] The upper hole of the inlet hole is provided with an inlet pipe 208 and the lower hole is provided with a convex pipe 209.

[0025] The pipe wall of the inlet pipe 208 is divided into two coaxial segments of different diameters along the axial direction and is respectively an upper segment and a lower segment, the diameter of the upper segment is larger than that of the lower segment, and a step surface is formed at the connection between the two.

[0026] The lower pipe of the convex pipe 209 is provided with a partition plate 210, and the partition plate 210 is provided with a communication hole in communication with the convex pipe 209.

[0027] The middle position of the cavity bottom of the heat conduction box 207 is provided with a core pipe 212, the upper end of the core pipe 212 is closed and coaxially located in the lower segment of the inlet pipe 208, and the partition plate 210 is provided with an avoiding hole for avoiding the core pipe 212.

[0028] The core pipe 212 is sleeved with a piston 213, the space below the core pipe 212 is stored with a thermal expansion medium such as air alcohol and the like, the upper surface of the piston 213 is provided with a connecting rod 214, the upper end of the connecting rod 214 extends out of the core pipe 212 and is provided with a sealing plate 216, and the spring 215 is arranged between the piston 213 and the upper end of the core pipe 212.

[0029] At the beginning, the lower surface of the sealing plate 216 is in close contact with the stepped surface, and the inlet pipe 208 is blocked. When the filter body 100 operates and generates heat at the heat generating part, the heat is conducted to the thermal expansion medium, causing the thermal expansion medium to expand and push the piston 213 upward, so that the sealing plate 216 moves upward. The outer diameter of the sealing plate 216 is smaller than the upper section of the inlet pipe 208, so the inlet pipe 208 is opened, and the actual flow opening size of the inlet pipe 208, that is, the flow rate, depends on the distance between the sealing plate 216 and the stepped surface. The greater the distance, the greater the opening for liquid flow, and the greater the liquid flow rate. Conversely, the smaller the distance, the smaller the opening for liquid flow, and the smaller the liquid flow rate. Therefore, it has the following technical advantages: It should be noted that different heat generating parts of the filter body 100 generate different heat, and the optimal working temperature range is also different, which is not described in detail in the prior art. On the one hand, for a single heat conduction unit 201, the opening size of the inlet pipe 208 for liquid flow is controlled by the thermal expansion medium. The more heat generated by the heat generating part, the larger the opening for liquid flow, and the more liquid participating in the flow, thereby achieving the purpose of self-adaptive heat dissipation. On the one hand, for a plurality of heat conduction units 201, the distribution amount of liquid flow is adjusted by changing the spring force coefficient of the spring 215. The lower the optimal working temperature of the heat generating part, the smaller the spring force coefficient of the spring 215 of the corresponding heat conduction unit 201, thereby ensuring that each heat generating part can be at the optimal working temperature as much as possible, and improving the working performance of the filter body 100.

[0030] Referring to Figure 3 With Figure 5 , the liquid storage unit 202 includes a liquid storage tank 2021, and the liquid storage tank 2021 is provided with a side pipe one 2022 and a side pipe two 2023.

[0031] One end of the side pipe one 2022 is located in the liquid storage tank 2021 and close to the upper end of the liquid storage tank 2021, and the other end of the side pipe one 2022 extends out of the liquid storage tank 2021 and is provided with a pipeline one 204, and the pipeline one 204 is connected with the inlet pipe 208.

[0032] One end of the side pipe two 2023 is located in the liquid storage tank 2021 and close to the lower end of the liquid storage tank 2021, and the other end of the side pipe two 2023 extends out of the liquid storage tank 2021 and is provided with a pipeline three 206, and the connection part of the two is provided with a one-way valve 2024, and the one-way valve 2024 is used for allowing the fluid to flow into the side pipe two 2023 from the pipeline three 206 in one direction. It can be realized in the prior art, and is not described in detail.

[0033] Referring to Figures 6-10 , the air cooling unit 203 includes an outer shell 217, and the outer shell 217 is open at both ends and connected with two ventilation holes provided on the shell of the filter body 100.

[0034] A motor 218 is arranged in the outer shell 217, and a fan shaft 219 is coaxially arranged at the output end of the motor 218, the fan shaft 219 is in the shape of a hollow shaft, and a pipeline four 222 is connected to the end of the fan shaft 219 through a rotary joint technology, a plurality of centrifugal blades 220 are arranged on the outer circumferential surface of the fan shaft 219 in the circumferential direction, and a fan 221 is arranged outside the fan shaft 219 and located on the side of the centrifugal blades 220 away from the motor 218; the motor 218 is started to drive the fan shaft 219 to rotate, and the fan shaft 219 rotates with the fan 221, so that a flow of air is formed in the outer shell 217, which can take away the heat of the cooling liquid, and the fan shaft 219 rotates at a high speed with the centrifugal blades 220.

[0035] The outer periphery of the fan shaft 219 coaxially has a fixing ring 229, the inner annular surface of the fixing ring 229 is connected to the side of the centrifugal blades 220 away from the fan shaft 219, the centrifugal blades 220 are hollow inside, the outer circumferential surface of the fan shaft 219 is provided with side holes in communication with the centrifugal blades 220, and the outer annular surface of the fixing ring 229 is provided with centrifugal holes 230 in communication with the centrifugal blades 220; the centrifugal blades 220 rotate at a high speed to generate centrifugal force, and the cooling liquid is thrown out through the centrifugal holes 230 under the action of the centrifugal force.

[0036] The outer circumferential surface of the fixing ring 229 is provided with annular side inner fins 227, the side inner fins 227 are arranged in multiple along the axial line of the fixing ring 229, and the two side inner fins 227 located at the two sides in the array direction are close to the two end surfaces of the fixing ring 229 respectively.

[0037] The outer annular surface of the side inner fin 227 is coaxially provided with a side outer fin 225, and the outer annular surfaces of all the side outer fins 225 are provided with a closed ring, and the outer annular surface of the closed ring is provided with a main fin 223.

[0038] The end surface of the side outer fin 225 is provided with a notch 226, and the upper aperture of the notch 226 of the uppermost side outer fin 225 is blocked.

[0039] The lower end surface of the closed ring is provided with a liquid receiving hopper 228, and the outer surface of the liquid receiving hopper 228 is connected with a ring pipe 224; the cooling liquid thrown out by centrifugal force finally flows into the ring pipe 224 through the notch 226 and the liquid receiving hopper 228, and at the same time, the airflow generated by the fan 221 cooperates with the main fin 223 to achieve heat dissipation of the cooling liquid.

[0040] Referring to Figure 3 , the end of the pipeline three 206 is connected with the ring pipe 224.

[0041] The end of the pipeline four 222 is provided with a pipeline two 205, and the pipeline two 205 is connected with the outlet pipe 211.

[0042] The working principle of the present application is: The motor 218 drives the fan shaft 219 to rotate, and when the fan shaft 219 rotates, a cooling air flow is formed in the outer housing 217 through the rotation of the fan 221, for cooperating with the main fins 223 to dissipate heat from the cooling liquid; At the same time, the fan shaft 219 rotates at high speed with the centrifugal blades 220, and under the action of centrifugal force, the cooling liquid is thrown out through the centrifugal holes 230 and finally enters the liquid storage tank 2021 through the gap 226, the liquid receiving hopper 228, the ring pipe 224, the pipe 206, the side pipe 2023, while the cooling liquid in the liquid storage tank 2021 flows into the heat conduction box 207 through the side pipe 2022, the pipe 204, the inlet pipe 208, the area between the step surface and the sealing plate 216, the convex pipe and the communication hole, and the cooling liquid in the heat conduction box 207 flows into the fan shaft 219 through the outlet pipe 211, the pipe 205 and the pipe 222; In this way, the circulation of the cooling liquid is realized, and the liquid cooling heat dissipation of the filter body 100 is realized.

[0043] From the above: I. It needs to be clear that different heat generating parts of the filter body generate different heat, and the best working temperature range is also different, which is not described in the prior art; On the one hand, for a single heat conduction unit, the opening size of the inlet pipe for liquid flow is controlled by the thermal expansion medium, and the more heat generated by the heat generating part, the larger the opening for liquid flow, and the more liquid participating in the flow, so as to realize the purpose of self-adaptive heat dissipation; On the other hand, for multiple heat conduction units, the spring force coefficient is changed to adjust the distribution of liquid flow, and the lower the best working temperature of the heat generating part, the smaller the spring force coefficient of the corresponding heat conduction unit, so as to ensure that each heat generating part can be at the best working temperature as much as possible, and the working performance of the filter body can be improved.

[0044] II. The setting of the centrifugal blades, on the one hand, can realize the basic function of circulating flow of the cooling liquid, on the other hand, the faster the speed, the faster the flow speed of the cooling liquid, and the higher the heat dissipation efficiency, on the other hand, the periphery of the centrifugal blades is connected with multiple side inner fins and side outer fins, and the cooling liquid absorbing heat can be thrown out through the centrifugal force, and laid on the side inner fins or side outer fins, realizing high-efficiency heat exchange, thereby improving the heat dissipation effect of the air cooling on the cooling liquid, and improving the overall heat dissipation effect of the filter body.

[0045] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed with the preferred embodiments as above, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, as long as the changes or modifications do not deviate from the technical solution of the present application. Any modification, change, equivalent change and modification of the above embodiments made according to the technical essence of the present application still belong to the scope of the technical solution of the present application.

Claims

1. An APF (Active Power Filter) with high heat dissipation function, comprising a filter body (100) and a heat dissipation assembly (200) for dissipating heat from the filter body (100), characterized in that, The heat dissipation assembly (200) includes a heat conduction unit (201), a liquid storage unit (202), and an air cooling unit (203). The heat conduction unit (201) includes a heat conduction box (207). The heat conduction box (207) is hollow inside and has an inlet and an outlet on its upper surface. An outlet pipe (211) is provided at the upper opening of the outlet, and an inlet pipe (208) is provided at the upper opening of the inlet. The pipe wall of the inlet pipe (208) is divided into two coaxial sections with unequal diameters along the axial direction, which are the upper section and the lower section, respectively. The diameter of the upper section is larger than that of the lower section, and a step surface is formed at the connection between the two. A core tube (212) is provided at the middle position of the bottom of the heat-conducting box (207). The upper end of the core tube (212) is closed and coaxially located in the lower section of the inlet tube (208). A piston (213) is sleeved inside the core tube (212). The space below the piston (213) in the core tube (212) stores a thermal expansion medium. A connecting rod (214) is provided on the upper surface of the piston (213). The upper end of the connecting rod (214) extends out of the core tube (212) and is provided with a sealing plate (216). A spring (215) is provided between the piston (213) and the upper end of the core tube (212). Initially, the lower surface of the sealing plate (216) is in contact with the step surface.

2. The APF active power filter with high heat dissipation function according to claim 1, characterized in that, A protruding tube (209) is provided at the lower opening of the inlet hole. A partition plate (210) is provided at the lower opening of the protruding tube (209). A connecting hole communicating with the protruding tube (209) is provided on the partition plate (210). A clearance hole for avoiding the core tube (212) is provided on the partition plate (210).

3. An APF active power filter with high heat dissipation function according to claim 1 or 2, characterized in that, Multiple heat conduction units (201) are provided and are distributed at various heat-generating parts of the filter body (100) according to the actual layout of the electronic components inside the filter body (100).

4. The APF active power filter with high heat dissipation function according to claim 1, characterized in that, The liquid storage unit (202) includes a liquid storage tank (2021), and a side pipe 1 (2022) and a side pipe 2 (2023) are provided inside the liquid storage tank (2021). One end of the side pipe (2022) is located inside the storage tank (2021) and close to the upper end of the storage tank (2021). The other end of the side pipe (2022) extends out of the storage tank (2021) and is provided with a pipe (204). The pipe (204) is connected to the inlet pipe (208). One end of the second side pipe (2023) is located inside the storage tank (2021) and close to the lower end of the storage tank (2021). The other end of the second side pipe (2023) extends out of the storage tank (2021) and is connected to the third pipe (206). A one-way valve (2024) is provided at the connection between the two. The one-way valve (2024) is used to allow fluid to flow unidirectionally from the third pipe (206) into the second side pipe (2023).

5. An APF active power filter with high heat dissipation function according to claim 4, characterized in that, The air-cooled unit (203) includes an outer shell (217), which has openings at both ends and is connected to two ventilation holes respectively provided on the housing of the filter body (100); A motor (218) is installed inside the outer casing (217). A fan shaft (219) is coaxially installed at the output end of the motor (218). The fan shaft (219) is hollow and the end of the fan shaft (219) is connected to a pipe (222) through a rotary joint. The outer surface of the fan shaft (219) is arranged with several centrifugal blades (220) in a circumferential array. A fan (221) is arranged on the outside of the fan shaft (219). The fan (221) is located on the side of the centrifugal blades (220) away from the motor (218).

6. An APF active power filter with high heat dissipation function according to claim 5, characterized in that, A retaining ring (229) is coaxially located around the fan shaft (219). The inner ring surface of the retaining ring (229) is connected to the side of the centrifugal blade (220) away from the fan shaft (219). The centrifugal blade (220) is hollow inside. The outer circular surface of the fan shaft (219) is provided with a side hole that communicates with the centrifugal blade (220). The outer ring surface of the retaining ring (229) is provided with a centrifugal hole (230) that communicates with the centrifugal blade (220). The outer circular surface of the fixing ring (229) is provided with annular inner fins (227). Multiple inner fins (227) are arranged in an array along the axis of the fixing ring (229). The two inner fins (227) located on the outermost sides of the array direction are close to the two end faces of the fixing ring (229). The outer ring surface of the inner side fin (227) is coaxially provided with outer side fins (225), and a closed ring is provided between the outer ring surfaces of all the outer side fins (225).

7. An APF active power filter with high heat dissipation function according to claim 6, characterized in that, The outer ring surface of the closed ring is provided with main fins (223).

8. An APF active power filter with high heat dissipation function according to claim 6, characterized in that, The end face of the outer side fin (225) is provided with a notch (226). The upper opening of the notch (226) of the uppermost outer side fin (225) is blocked. The lower end face of the sealing ring is provided with a liquid receiving hopper (228). The outer surface of the liquid receiving hopper (228) is connected to a ring tube (224).

9. An APF active power filter with high heat dissipation function according to claim 8, characterized in that, The end of pipe three (206) is connected to the ring pipe (224), and the end of pipe four (222) is provided with pipe two (205), which is connected to the outlet pipe (211).

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