Cooling system for medium and high voltage frequency converter

Abstract

The application relates to a medium-high voltage frequency converter cooling system which comprises a cooling part and a driving part, a water inlet pipeline is connected between a water outlet end of a radiator and a water inlet end of the driving part, a communication pipeline is connected between a water outlet end of the driving part and a water inlet end of the cooling part, and a cooling pipeline is connected between a water outlet end of the cooling part and a water inlet end of the radiator. The driving part and the cooling part are arranged in the application, the water cooling of the radiator is recycled, the waste of water resources is reduced, and the use cost of the medium-high voltage frequency converter is reduced; the ion exchanger is arranged, water entering the heat exchanger is not prone to electric corrosion and electric leakage under a high voltage state, thereby reducing the consumption of the heat exchanger and prolonging the service life of the heat exchanger; the constant-pressure water tank is arranged, the water inlet pipeline keeps constant pressure, the water inlet pipeline is not prone to pressure rise and explosion, and therefore the safety of the medium-high voltage frequency converter cooling system is improved.

Description

Technical Field

[0001] This application relates to the field of medium and high voltage frequency converters, and in particular to a cooling system for medium and high voltage frequency converters. Background Technology

[0002] A frequency converter is a power control device that uses frequency conversion technology and microelectronics to control an AC motor by changing the frequency of the power supply to the motor. In many power electronic circuits, medium and high voltage frequency converters are power control devices that use the switching on and off of semiconductor power devices to change the frequency, and are used to achieve functions such as soft start, variable frequency speed regulation, power factor correction, and overcurrent / overvoltage / overload protection.

[0003] When these power devices frequently switch on and off, medium- and high-voltage frequency converters convert most of the electrical energy into heat energy. This high temperature operation makes the converters susceptible to damage. Therefore, appropriate heat sinks are needed to effectively dissipate heat from the power devices, ensuring the normal operation of the medium- and high-voltage frequency converters. Cooling methods for heat sinks in medium- and high-voltage frequency converters include natural air cooling, forced air cooling, water cooling, and oil cooling. Among these, water cooling has extremely high heat dissipation efficiency and can significantly increase the capacity of the power components.

[0004] During water cooling, the radiator needs to continuously supply cold water to cool the medium and high voltage frequency converter. The cold water cools the medium and high voltage frequency converter through the water inlet of the radiator and is discharged from the water outlet of the radiator. This makes it impossible to recycle the water source, resulting in a certain waste of water resources and increasing the operating cost of the medium and high voltage frequency converter. Summary of the Invention

[0005] To address the cost issue of water-cooled heat dissipation in medium and high voltage frequency converters, this application provides a cooling system for medium and high voltage frequency converters.

[0006] This application provides a medium- and high-voltage frequency converter cooling system, which adopts the following technical solution:

[0007] A medium- and high-voltage frequency converter cooling system includes a cooling component and a driving component. The water outlet of the radiator is connected to the water inlet of the driving component via an inlet pipe. The water outlet of the driving component is connected to the water inlet of the cooling component via a connecting pipe. The water outlet of the cooling component is connected to the water inlet of the radiator via a cooling pipe. The driving component drives the water discharged from the water outlet of the radiator to pass through the inlet pipe and the connecting pipe sequentially and enter the cooling component. The cooling component is used to cool the water discharged from the water outlet of the radiator, and the water cooled by the cooling component flows back to the water inlet of the radiator through the cooling pipe.

[0008] By adopting the above technical solution, when the medium and high voltage frequency converter is running, the radiator cools the medium and high voltage frequency converter, making it less likely to be damaged by operating at high temperature for a long time. The drive unit drives the water heated in the radiator to pass through the inlet pipe and connecting pipe in sequence and enter the cooling unit. The water transfers most of its internal heat to the cooling unit, thus cooling the water. The cooled water flows back to the water inlet of the radiator through the cooling pipe, realizing the recycling of water cooling heat dissipation of the radiator, reducing water waste and lowering the operating cost of medium, high and low voltage frequency converters.

[0009] Optionally, the cooling component includes a heat exchanger, which is connected to a cooling pipe and a drain pipe. Water enters the heat exchanger through the cooling pipe and is discharged from the drain pipe.

[0010] By adopting the above technical solution, water enters the heat exchanger through the cooling pipe and is discharged from the drain pipe. Water has a large specific heat capacity and heats up slowly. The water in the connecting pipe will transfer most of its internal energy to the water in the cooling pipe, thus achieving stable cooling of the water in the connecting pipe.

[0011] Optionally, the cooling pipe is connected to an opening and closing device, which is used to detect the water temperature in the cooling pipe and control the opening and closing of the cooling pipe. When the water temperature in the cooling pipe is lower than a preset value, the opening and closing device closes the cooling pipe; when the water temperature in the cooling pipe is equal to the preset value, the opening and closing device opens the cooling pipe.

[0012] By adopting the above technical solution, when water enters the heat exchanger through the cooling pipe and is discharged from the drain pipe, the opening and closing device is used to detect the water temperature in the cooling pipe and control the opening and closing of the cooling pipe. When the water temperature in the cooling pipe is lower than the preset value, the opening and closing device closes the cooling pipe, so that the water flow temperature in the heat exchanger is constant, thereby improving the service life of the heat exchanger.

[0013] Optionally, a filter element is connected between the driving component and the cooling component. The filter element is used to filter water in the connecting pipe. The filter element includes an ion exchanger, which is used to adsorb ions in the water. A filter pipe is connected between the water inlet of the ion exchanger and the connecting pipe, and a return pipe is connected between the water outlet of the ion exchanger and the water inlet pipe. When water in the connecting pipe enters the ion exchanger through the filter pipe, the water is filtered by the ion exchanger and then enters the water inlet pipe through the return pipe.

[0014] By adopting the above technical solution, the water in the connecting pipe enters the ion exchanger through the filter pipe. The ion exchanger adsorbs ions in the water, thereby reducing the water's conductivity and improving its electrical insulation performance. After being purified by the ion exchanger, the water flows from the outlet of the ion exchanger through the return pipe, the inlet pipe, and the connecting pipe before entering the heat exchanger. The water entering the heat exchanger is less prone to electro-corrosion and leakage under high voltage conditions, thereby reducing heat exchanger wear and extending its service life.

[0015] Optionally, the filter element further includes a filter for filtering ion exchanger in the water. The filter is connected to the return pipe, and the water discharged from the outlet of the ion exchanger passes through the filter and enters the inlet pipe.

[0016] By adopting the above technical solution, the ion exchanger adsorbs ions in the water, reducing the water's conductivity. The deionized water enters the filter from the outlet of the ion exchanger. The filter adsorbs the ion exchanger particles in the water, further improving the water's purity and making it less prone to scale buildup on the inner wall of the pipe, thereby improving the stability of water transmission.

[0017] Optionally, a control component is connected to the filter pipe. The control component is used to detect the conductivity of the water in the filter pipe and control the opening and closing of the filter pipe. When the conductivity of the water in the filter pipe is higher than a preset value, the control component drives the filter pipe to open, and the ion exchanger adsorbs ions from the water in the filter pipe.

[0018] By adopting the above technical solution, when the controller detects that the conductivity of the water in the filter pipe is higher than the preset value, the filter pipe is opened, and the water in the connecting pipe enters the ion exchanger through the filter pipe. The ion exchanger adsorbs ions in the water, thereby reducing the conductivity of the water. When the controller detects that the conductivity of the water in the filter pipe is equal to the preset value, the filter pipe is closed, and the water in the connecting pipe does not need to enter the ion exchanger for impurity removal through the filter pipe. This achieves directional opening and closing of the ion exchanger, so that the ion exchanger does not need to be in a working state all the time, thereby reducing the wear and tear of the ion exchanger and improving its service life.

[0019] Optionally, a constant pressure water tank is also included. The constant pressure water tank is connected to the water inlet pipe via an exhaust pipe and a water supply pipe. The exhaust pipe is located above the water supply pipe. When water from the radiator outlet enters the water inlet pipe, it drives the air in the water inlet pipe to enter the constant pressure water tank through the air supply pipe, which in turn drives the water in the constant pressure water tank to enter the water inlet pipe through the water supply pipe.

[0020] By adopting the above technical solution, when water from the radiator outlet enters the inlet pipe, the air in the inlet pipe enters the constant pressure water tank through the air supply pipe, and drives the water in the constant pressure water tank to enter the inlet pipe through the water supply pipe, thereby discharging the air in the inlet pipe, keeping the inlet pipe at constant pressure, and preventing the inlet pipe from becoming pressurized and exploding, thus improving the safety of the medium and high voltage frequency converter cooling system.

[0021] Optionally, the water inlet pipe is connected to a pressure gauge, which is used to detect the water pressure inside the water inlet pipe.

[0022] By adopting the above technical solution, staff can directly observe the water pressure in the inlet pipe based on the value on the pressure gauge, realizing real-time monitoring of the water pressure inside the inlet pipe, making it less likely for the inlet pipe to explode due to pressure rise, and further improving the safety of the medium and high voltage frequency converter cooling system.

[0023] Optionally, there are two drive components, with the water inlet ends of both drive components connected to a water inlet pipe and the water outlet ends of both drive components connected to a connecting pipe.

[0024] By adopting the above technical solution, the driving component drives the water at the outlet of the radiator to pass through the inlet pipe and the connecting pipe in sequence and enter the cooling component. After being cooled by the cooling component, the water flows back to the inlet of the radiator through the cooling pipe, realizing the recycling of water resources. When one of the driving components fails, the other driving component operates, thereby maintaining the stability of the water resource circulation, making it less likely for the medium and high voltage frequency converter to overheat during operation, and improving the service life of the medium and high voltage frequency converter.

[0025] Optionally, it also includes a frame, wherein the drive component, cooling component and filter component are all connected to the end face of the frame to form a limit.

[0026] By adopting the above technical solution, the drive component, cooling component, and filter component are connected to the end face of the frame to form a limit, making it difficult for the drive component, cooling component, and filter component to shift, ensuring the stability of the pipeline connection between the drive component, cooling component, and filter component, and further improving the stability of water resource circulation.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. The design of the drive and cooling components enables the cyclical use of water cooling in the radiator, reducing water waste and lowering the operating costs of medium, high, and low frequency inverters;

[0029] 2. The ion exchanger design prevents water entering the heat exchanger from undergoing electro-corrosion and leakage under high voltage conditions, thereby reducing heat exchanger wear and extending its service life.

[0030] 3. The constant pressure water tank ensures that the inlet water pipe maintains constant pressure, preventing pressure build-up and potential explosion, thereby improving the safety of the medium and high voltage frequency converter cooling system. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application.

[0032] Figure 2 This is a schematic diagram of the overall structure of the connection between the drive component, the cooling component, and the filter component in Embodiment 1 of this application.

[0033] Figure 3 This is a partial cross-sectional view of the constant pressure water tank in Embodiment 2 of this application, mainly showing the on / off components.

[0034] Figure 4 This is a cross-sectional view of the constant pressure water tank in Embodiment 2 of this application.

[0035] Explanation of reference numerals in the attached drawings: 1. Frame; 11. Base plate; 111. Water inlet; 112. Cooling hole; 113. Cooling hole; 114. Drain hole; 12. Cover plate; 13. Support column; 2. Cooling component; 21. Heat exchanger; 3. Drive component; 4. Water inlet pipe; 41. Water inlet section one; 42. Water inlet section two; 43. Water inlet section three; 5. Connecting pipe; 51. Connecting section one; 52. Connecting section two; 53. Connecting section three; 6. Cooling pipe; 7. Cooling pipe; 8. Drain pipe; 9. Opening and closing component; 91. Electric temperature regulating valve; 10. 101. Filter element; 102. Ion exchanger; 103. Filter; 14. Limiting plate; 15. Filter pipe; 16. Return pipe; 17. Control element; 171. Solenoid valve; 18. Constant pressure water tank; 181. Air outlet; 182. Connecting hole; 183. Sliding groove; 19. Exhaust pipe; 20. Water supply pipe; 22. Opening and closing valve; 23. Pressure gauge; 24. Detection float; 25. Sight glass; 26. On / off element; 261. Abutment plate; 262. On / off plate; 263. Synchronous pulley; 264. Synchronous belt; 27. Fixing column. Detailed Implementation

[0036] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0037] This application discloses a cooling system for medium and high voltage frequency converters.

[0038] Example 1

[0039] Reference Figure 1 The medium and high voltage frequency converter cooling system includes a frame 1, a cooling component 2, and a drive component 3. The frame 1 is used to fix the cooling component 2 and the drive component 3. The drive component 3 is used to drive the water from the radiator outlet into the cooling component 2. The cooling component 2 is used to cool the water discharged from the radiator outlet.

[0040] Reference Figure 1 The frame 1 includes a base plate 11, a cover plate 12, and four support columns 13. The four support columns 13 are welded and fixed to the four corners of the base plate 11, and the bottom wall of the support columns 13 is used to support the ground. The ends of the four support columns 13 away from the base plate 11 are welded and fixed to the four corners of the cover plate 12, respectively. The cooling component 2 and the driving component 3 are connected to the end face of the base plate 11 facing the cover plate 12 and are fixed together, and the cooling component 2 and the driving component 3 are located on both sides of the end face of the base plate 11.

[0041] Reference Figure 1 There are two drive components 3. In this embodiment, the drive component 3 is a water pump, which is fixed to the end face of the base plate 11 by screws. A water inlet hole 111 is provided on the end face of the base plate 11. The axis of the water inlet hole 111 is parallel to the length direction of the support column 13, and the water inlet hole 111 passes through the base plate 11 along its own axis. A water inlet pipe 4 is connected between the radiator and the drive component 3. The diameter of the water inlet hole 111 is the same as the diameter of the water inlet pipe 4.

[0042] Reference Figure 1 The water inlet pipe 4 includes a first water inlet section 41, a second water inlet section 42, and a third water inlet section 43. The ends of the first water inlet section 41, the second water inlet section 42, and the third water inlet section 43 are welded together. The other end of the first water inlet section 41 is provided with a water inlet hole 111 and is connected to the water outlet of the radiator through a flange. The outer circumferential wall of the first water inlet section 41 is pressed against the inner circumferential wall of the water inlet hole 111 to form a fixed structure. The other ends of the second water inlet section 42 and the third water inlet section 43 correspond one-to-one with the two driving components 3. The ends of the second water inlet section 42 and the third water inlet section 43 are connected to the water inlet end of the driving component 3 through a flange.

[0043] Reference Figure 1 The cooling component 2 includes a heat exchanger 21, which is fixed to the end face of the base plate 11 by screws. A connecting pipe 5 connects the heat exchanger 21 and the driving component 3. The connecting pipe 5 includes a first connecting section 51, a second connecting section 52, and a third connecting section 53. The ends of the first connecting section 51, the second connecting section 52, and the third connecting section 53 are welded together. The other ends of the second connecting section 52 and the third connecting section 53 correspond one-to-one with the two driving components 3. The ends of the second connecting section 52 and the third connecting section 53 are connected to the water outlet of the driving component 3 by flanges. The end of the first connecting section 51 away from the second connecting section 52 is connected to the water inlet of the heat exchanger 21 by flanges.

[0044] Reference Figure 1The heat exchanger 21 is connected to a cooling pipe 6. A cooling hole 112 is provided on the end face of the base plate 11. The axis of the cooling hole 112 is parallel to the axis of the water inlet 111. The diameter of the cooling pipe 6 is equal to the diameter of the cooling hole 112, and the cooling hole 112 passes through the base plate 11 along its own axis. One end of the cooling pipe 6 is connected to the water outlet of the heat exchanger 21 through a flange, and the other end of the cooling pipe 6 passes through the cooling hole 112 and is connected to the water inlet of the radiator through a flange. The outer circumference of the cooling hole 112 is pressed against the inner circumference of the cooling pipe 6 to form a fixed structure.

[0045] Reference Figure 1 The driving component 3 drives the water from the radiator outlet to pass through the inlet pipe 4 and the connecting pipe 5 in sequence and enter the heat exchanger 21. After the heat exchanger 21 cools the water, it enters the radiator inlet through the cooling pipe 6, thereby realizing the recycling of radiator water resources, reducing water waste, and lowering the operating cost of medium and high voltage frequency converters.

[0046] Reference Figure 1 The heat exchanger 21 is connected to a cooling pipe 7 and a drain pipe 8. The end face of the base plate 11 has a cooling hole 113 and a drain hole 114. The diameter of the cooling hole 113 is equal to the diameter of the cooling pipe 7, and the diameter of the drain hole 114 is equal to the diameter of the drain pipe 8. The axes of the cooling hole 113, the drain hole 114, and the cooling hole 112 are parallel to each other, and the cooling hole 113 and the drain hole 114 penetrate the base plate 11 along their own axes.

[0047] Reference Figure 1 One end of the cooling pipe 7 is connected to the heat exchanger 21 via a flange, and the other end of the cooling pipe 7 passes through a cooling hole 113 and connects to the water outlet of the cooling tower. The cooling pipe 7 is fixed to the outer wall of the cooling hole 113 and the inner wall of the cooling pipe 7. One end of the drain pipe 8 is connected to the heat exchanger 21 via a flange, and the other end of the drain pipe 8 passes through a drain hole 114 and connects to the water inlet of the cooling tower. The drain pipe 8 is fixed to the outer wall of the drain hole 114 and the inner wall of the drain pipe 8.

[0048] Reference Figure 1 Water from the cooling tower outlet enters the heat exchanger 21 through cooling pipe 7. The water in connecting pipe 5 transfers most of its internal heat to the water in cooling pipe 7, thus cooling the water in connecting pipe 5. The heated water in cooling pipe 7 enters the cooling tower inlet through drain pipe 8. The cooling tower cools the water in cooling pipe 7 and returns it from the cooling tower outlet to cooling pipe 7, thereby circulating the water in heat exchanger 21, further reducing water waste and lowering the operating cost of medium and high voltage frequency converters.

[0049] Reference Figure 1A shut-off element 9 is connected to the cooling pipe 7. The shut-off element 9 is used to detect the water temperature in the cooling pipe 7 and control the opening and closing of the cooling pipe 7. The shut-off element 9 includes an electric temperature regulating valve 91. The electric temperature regulating valve 91 is set with a preset value, which is the ambient temperature. In this embodiment, the preset value of the electric temperature regulating valve 91 is 20°C. The electric temperature regulating valve 91 compares the water temperature in the cooling pipe 7 with the preset value.

[0050] Reference Figure 1 When the water temperature in the cooling pipe 7 is lower than the preset value, the electric temperature regulating valve 91 closes the cooling pipe 7 to keep the water in the heat exchanger 21 at a constant temperature; when the water temperature in the cooling pipe 7 is equal to the preset value, the electric temperature regulating valve 91 opens the cooling pipe 7, and the water in the cooling pipe 7 enters the heat exchanger 21 stably, thereby maintaining the heat exchanger 21 to stably cool the water in the connecting pipe 5.

[0051] Reference Figure 1 and Figure 2 A filter element 10 is connected between the drive unit 3 and the heat exchanger 21. The filter element 10 is used to filter the water in the connecting pipe 5. The filter element 10 includes an ion exchanger 101 and a filter 102. The ion exchanger 101 is used to adsorb ions in the water, and the filter 102 is used to filter ion exchanger particles in the water. The ion exchanger 101 is fixed to the end face of the base plate 11 with screws. A limiting plate 14 is welded and fixed to the end face of the base plate 11 near the ion exchanger 101. The filter 102 is fixed to the end face of the limiting plate 14 with screws.

[0052] Reference Figure 2 A filter pipe 15 is connected between the connecting pipe 5 and the ion exchanger 101. One end of the filter pipe 15 is welded to the other end of the filter pipe 15, and the other end of the filter pipe 15 is connected to the inlet end of the ion exchanger 101. A return pipe 16 is connected between the inlet pipe 4 and the ion exchanger 101. One end of the return pipe 16 is welded to the inlet pipe 4, and the other end of the return pipe 16 is connected to the outlet end of the ion exchanger 101. The filter 102 is connected to the return pipe 16.

[0053] Reference Figure 2 Water in the connecting pipe 5 enters the ion exchanger 101 through the filter pipe 15. The ion exchanger 101 adsorbs ions in the water, thereby reducing the water's conductivity and making it less prone to electro-corrosion and leakage under high voltage conditions. After being adsorbed by the ion exchanger 101, the water enters the filter 102 through the return pipe 16. The filter 102 filters out the ion exchanger particles in the water and then enters the inlet pipe 4 through the return pipe 16, further improving the purity of the water and making it less prone to scale buildup on the inner wall of the pipe, thereby improving the stability of water flow in the pipe.

[0054] Reference Figure 2 A control component 17 is connected to the end face of the filter pipe 15 near the connecting pipe 5. The control component 17 is used to detect the conductivity of the water in the filter pipe 15 and control the opening and closing of the filter pipe 15. The control component 17 includes a solenoid valve 171, a conductivity meter, and a controller. The solenoid valve 171 and the conductivity meter are electrically connected to the controller. The solenoid valve 171 is used to control the opening and closing of the filter pipe 15. The conductivity meter is used to detect the conductivity of the water in the filter pipe 15 and send the conductivity to the controller. The controller is set with a preset value, which is the conductivity of high-purity water. In this embodiment, the preset value of the controller is 0.1 μS / cm. The controller compares the conductivity with the preset value.

[0055] Reference Figure 2 When the conductivity is greater than the preset value, the controller drives the solenoid valve 171 to open the filter pipe 15, and the water in the connecting pipe 5 enters the ion exchanger 101 through the filter pipe 15; when the conductivity is equal to the preset value, the controller drives the solenoid valve 171 to close the filter pipe 15, thereby realizing directional filtration of the ion exchanger 101, reducing the wear and tear of the ion exchanger 101, and thus improving the service life of the ion exchanger 101.

[0056] Reference Figure 1 The medium- and high-voltage frequency converter also includes a constant pressure water tank 18, which is fixed to the limiting plate 14 by screws. The constant pressure water tank 18 is located on the side of the limiting plate 14 near the cover plate 12. An exhaust pipe 19 and a water supply pipe 20 are connected between the constant pressure water tank 18 and the water inlet pipe 4. One end of the exhaust pipe 19 is connected to the water inlet pipe 4, and an on / off valve 22 is connected at the connection between the exhaust pipe 19 and the water inlet pipe 4. The on / off valve 22 is used to control the opening and closing of the exhaust pipe 19 and the water inlet pipe 4. The other end of the exhaust pipe 19 is fixed to the top wall of the constant pressure water tank 18 and the exhaust pipe 19 is connected to the inner cavity of the constant pressure water tank 18.

[0057] Reference Figure 1 One end of the water supply pipe 20 is connected to the water inlet pipe 4, and the other end of the water supply pipe 20 is fixed to the bottom wall of the constant pressure water tank 18, and the water supply pipe 20 is connected to the inner cavity of the constant pressure water tank 18; the exhaust pipe 19 located on the water inlet pipe 4 is higher than the water supply pipe 20 on the water inlet pipe 4.

[0058] Reference Figure 1 Open the on / off valve 22, and the exhaust pipe 19 is connected to the water inlet pipe 4. Water from the radiator outlet enters the water inlet pipe 4, driving the water in the water inlet pipe 4 to enter the inner cavity of the constant pressure water tank 18 through the exhaust pipe 19. The air pressure in the constant pressure water tank 18 increases, driving the water in the constant pressure water tank 18 to enter the water inlet pipe 4 from the water supply pipe 20, thereby releasing the air in the water inlet pipe 4 and preventing the water pressure in the water inlet pipe 4 from becoming too high and bursting, thus improving the safety of the medium and high voltage frequency converter cooling system.

[0059] Reference Figure 1 A pressure gauge 23 is connected to the water inlet pipe 4. The pressure gauge 23 is used to detect the water pressure in the water inlet pipe 4. The staff can directly observe the water pressure in the water inlet pipe 4, which further improves the safety of the medium and high voltage frequency converter cooling system.

[0060] The implementation principle of a medium- and high-voltage frequency converter cooling system in Embodiment 1 of this application is as follows: the driving component 3 drives the water at the outlet of the radiator to pass through the inlet pipe 4 and the connecting pipe 5 in sequence and enter the heat exchanger 21. After the heat exchanger 21 cools the water, it enters the inlet of the radiator through the cooling pipe 6, thereby realizing the recycling of radiator water resources, reducing water waste, and reducing the operating cost of medium- and high-voltage frequency converters.

[0061] Meanwhile, the water in the connecting pipe 5 enters the ion exchanger 101 through the filter pipe 15. The ion exchanger 101 adsorbs ions in the water, thereby reducing the water's conductivity and making it less prone to electro-corrosion and leakage under high voltage conditions. The water adsorbed by the ion exchanger 101 enters the filter 102 through the return pipe 16. The filter 102 filters the ion exchanger particles in the water and then enters the inlet pipe 4 through the return pipe 16, further improving the water's purity and making it less prone to scale buildup on the inner wall of the pipe, thereby improving the stability of water flow in the pipe.

[0062] Example 2

[0063] Reference Figure 3 and Figure 4 The difference between Embodiment 2 and Embodiment 1 is that the constant pressure water tank 18 has an air vent 181 on its top wall, which connects to the inner cavity of the constant pressure water tank 18. The constant pressure water tank 18 has a connecting hole 182 on its bottom wall, which also connects to the inner cavity of the constant pressure water tank 18. The outer circumferential wall of the external water pipe is tightly fixed against the inner circumferential wall of the connecting hole 182. When water from the external water pipe enters the inner cavity of the constant pressure water tank 18 through the connecting hole 182, it forces the air inside the constant pressure water tank 18 to be discharged from the air vent 181, thus achieving water storage in the constant pressure water tank 18.

[0064] Reference Figure 3 and Figure 4 A detection float 24 is connected to the constant pressure water tank 18. In this embodiment, the constant pressure water tank 18 is a column. A sliding groove 183 is provided on the end face of the constant pressure water tank 18. In this embodiment, the sliding groove 183 is a strip groove. The length direction of the sliding groove 183 is parallel to the axis of the constant pressure water tank 18. The depth direction of the sliding groove 183 penetrates the constant pressure water tank 18 and the sliding groove 183 is connected to the inner cavity of the constant pressure water tank 18.

[0065] Reference Figure 3 and Figure 4The end of the detection float 24 is embedded in the sliding groove 183, and the detection float 24 slides down along the length of the sliding groove 183. A viewing mirror 25 is connected to the constant pressure water tank 18. The outer circumferential wall of the viewing mirror 25 is pressed against the inner circumferential wall of the sliding groove 183, and the end face of the viewing mirror 25 is flush with the end face of the constant pressure water tank 18.

[0066] Reference Figure 3 and Figure 4 When the liquid level in the constant pressure water tank 18 decreases, the detection float 24 is driven to slide along the inner wall of the sliding groove 183 toward the bottom plate 11. The staff can directly observe the liquid level in the constant pressure water tank 18 through the viewing mirror 25, so that the staff can replenish the water in the constant pressure water tank 18 in a timely manner.

[0067] Reference Figure 3 and Figure 4 A switch 26 is connected to the constant pressure water tank 18, which controls the opening and closing of the vent 181. The switch 26 includes an abutment plate 261, a switch plate 262, two synchronous pulleys 263, and a synchronous belt 264 used in conjunction with the synchronous pulleys 263. The two synchronous pulleys 263 are rotatably connected to the corresponding inner walls of the constant pressure water tank 18, and the synchronous belt 264 is tensioned to connect the two synchronous pulleys 263. The transmission direction of the synchronous belt 264 is parallel to the axis of the constant pressure water tank 18.

[0068] Reference Figure 3 and Figure 4 One end of the abutment plate 261 is welded and fixed to the rotating shaft of one of the synchronous pulleys 263 along its length. The other end of the abutment plate 261 is used to abut the detection float 24. One end of the through-and-off plate 262 is welded and fixed to the rotating shaft of another synchronous pulley 263 along its length. The other end of the through-and-off plate 262 is used to abut the detection float 24. The length directions of the through-and-off plate 262 and the abutment plate 261 are parallel to each other, and the end face of the through-and-off plate 262 faces the air outlet 181.

[0069] Reference Figure 3 and Figure 4 When the constant pressure water tank 18 is full of water, the water covers part of the volume of the detection float 24 and drives the detection float 24 to slide along the inner wall of the sliding groove 183 toward the direction of approaching the through-break plate 262. The end of the detection float 24 abuts against the end of the through-break plate 262, driving the end face of the through-break plate 262 to press against the top wall of the inner cavity of the constant pressure water tank 18 and sealing the vent 181. At the same time, it drives the abutment plate 261 to rotate toward the direction of approaching the through-break plate 262.

[0070] Reference Figure 3 and Figure 4When the liquid level in the constant pressure water tank 18 drops, the detection float 24 slides along the inner wall of the sliding groove 183 towards the abutment plate 261 under its own weight. The end of the detection float 24 abuts against the end of the abutment plate 261, driving the through-stop plate 262 to rotate away from the vent 181, thereby opening the vent 181. Water in the external water pipe enters the inner cavity of the constant pressure water tank 18 steadily through the connecting hole 182. At the same time, air in the constant pressure water tank 18 is discharged from the vent 181. There is no need for the staff to manually open the vent 181, thereby improving the water storage efficiency of the constant pressure water tank 18.

[0071] Reference Figure 3 and Figure 4 A fixing post 27 is fixed to the end face of the through-plate 262 facing the vent 181. The diameter of the fixing post 27 is equal to the diameter of the vent 181. When the through-plate 262 rotates towards the vent 181, the outer circumferential wall of the fixing post 27 presses against the inner circumferential wall of the vent 181 to form a seal, further improving the sealing performance of the inner cavity of the constant pressure water tank 18. The fixing post 27 can be made of rubber or silicone. In this embodiment, the fixing post 27 is made of rubber, which has a certain deformation capacity, improving the stability of the fixing post 27 embedded in the vent 181.

[0072] The implementation principle of a medium- and high-voltage frequency converter cooling system in Embodiment 2 of this application is as follows: Open the on / off valve 22, and the exhaust pipe 19 is connected to the water inlet pipe 4. Water from the radiator outlet enters the water inlet pipe 4, driving the water in the water inlet pipe 4 to enter the inner cavity of the constant pressure water tank 18 through the exhaust pipe 19. The air pressure in the constant pressure water tank 18 increases, driving the water in the constant pressure water tank 18 to enter the water inlet pipe 4 from the water supply pipe 20, thereby discharging the air in the water inlet pipe 4 and preventing the water pressure in the water inlet pipe 4 from becoming too high and bursting, thus improving the safety of the medium- and high-voltage frequency converter cooling system.

[0073] When the water in the constant pressure water tank 18 is used up, the detection float 24 slides along the inner wall of the sliding groove 183 towards the abutment plate 261 under its own weight. The end of the detection float 24 abuts against the end of the abutment plate 261, driving the through-stop plate 262 to rotate away from the vent 181, thereby opening the vent 181. Water in the external water pipe enters the inner cavity of the constant pressure water tank 18 steadily through the connecting hole 182. At the same time, air in the constant pressure water tank 18 is discharged from the vent 181. There is no need for the staff to manually open the vent 181, thereby improving the water storage efficiency of the constant pressure water tank 18.

[0074] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A cooling system for medium and high voltage frequency converters, characterized in that: The device includes a cooling component (2) and a driving component (3). A water inlet pipe (4) connects the water outlet of the radiator to the water inlet of the driving component (3). A connecting pipe (5) connects the water outlet of the driving component (3) to the water inlet of the cooling component (2). A cooling pipe (6) connects the water outlet of the cooling component (2) to the water inlet of the radiator. The driving component (3) drives the water discharged from the radiator outlet through the water inlet pipe (4) and the connecting pipe (5) sequentially into the cooling component (2). The cooling component (2) cools the water discharged from the radiator outlet, and the water cooled by the cooling component (2) then flows through… The cooling pipe (6) flows back to the radiator inlet end; it also includes a constant pressure water tank (18), and the constant pressure water tank (18) is connected to the inlet pipe (4) by an exhaust pipe (19) and a water supply pipe (20). The exhaust pipe (19) located on the inlet pipe (4) is higher than the water supply pipe (20) on the inlet pipe (4). When the water at the radiator outlet end enters the inlet pipe (4), it drives the air in the inlet pipe (4) to enter the constant pressure water tank (18) through the air supply pipe, and drives the water in the constant pressure water tank (18) to enter the inlet pipe (4) through the water supply pipe (20);The constant pressure water tank (18) has an air vent (181) on its top wall, which is connected to the inner cavity of the constant pressure water tank (18). The constant pressure water tank (18) has a connecting hole (182) on its bottom wall, which is connected to the inner cavity of the constant pressure water tank (18). The outer circumferential wall of the external water pipe is abutted and fixed against the inner circumferential wall of the connecting hole (182). The constant pressure water tank (18) is connected to a detection float (24). The end face of the constant pressure water tank (18) has a sliding groove (183), which penetrates the constant pressure water tank in the depth direction. A pressure tank (18) is provided, and the sliding groove (183) is connected to the inner cavity of the constant pressure tank (18). The end of the detection float (24) is embedded in the sliding groove (183), and the detection float (24) slides down along the length of the sliding groove (183). The constant pressure tank (18) is connected to a viewing mirror (25), and the outer circumferential wall of the viewing mirror (25) abuts against the inner wall of the sliding groove (183). The constant pressure tank (18) is connected to a switching element (26), which includes an abutment plate (261), a switching plate (262), and two synchronous... A wheel (263) and a synchronous belt (264) used in conjunction with the synchronous wheel (263) are provided. The two synchronous wheels (263) are rotatably connected to the opposite inner walls of the constant pressure water tank (18) in a one-to-one correspondence. The synchronous belt (264) is tensioned to connect the two synchronous wheels (263). The transmission direction of the synchronous belt (264) is parallel to the axis of the constant pressure water tank (18). One end of the abutment plate (261) along its length is welded and fixed to the rotating shaft of one of the synchronous wheels. The other end of the abutment plate (261) along its length is used to abut against the detection float (24). One end of the through-cut plate (262) along its length is welded and fixed to the rotating shaft of another synchronous pulley. The other end of the through-cut plate (262) along its length is used to abut against the detection float (24). The length directions of the through-cut plate (262) and the abutment plate (261) are parallel to each other, and the end face of the through-cut plate (262) faces the vent (181). A fixing post (27) is fixed to the end face of the through-cut plate (262) facing the vent (181). The outer circumferential wall of the fixing post (27) abuts against the inner circumferential wall of the vent (181) to form a seal.

2. The medium- and high-voltage frequency converter cooling system according to claim 1, characterized in that: The cooling component (2) includes a heat exchanger (21), which is connected to a cooling pipe (7) and a drain pipe (8). Water enters the heat exchanger (21) through the cooling pipe (7) and is discharged from the drain pipe (8).

3. The medium- and high-voltage frequency converter cooling system according to claim 2, characterized in that: The cooling pipe (7) is connected to an opening and closing component (9). The opening and closing component (9) is used to detect the water temperature in the cooling pipe (7) and control the opening and closing of the cooling pipe (7). When the water temperature in the cooling pipe (7) is lower than the preset value, the opening and closing component (9) closes the cooling pipe (7); when the water temperature in the cooling pipe (7) is equal to the preset value, the opening and closing component (9) opens the cooling pipe (7).

4. The medium- and high-voltage frequency converter cooling system according to claim 2, characterized in that: A filter element (10) is connected between the drive element (3) and the cooling element (2). The filter element (10) is used to filter the water in the connecting pipe (5). The filter element (10) includes an ion exchanger (101). The ion exchanger (101) is used to adsorb ions in the water. A filter pipe (15) is connected between the water inlet of the ion exchanger (101) and the connecting pipe (5). A return pipe (16) is connected between the water outlet of the ion exchanger (101) and the water inlet pipe (4). When the water in the connecting pipe (5) enters the ion exchanger (101) through the filter pipe (15), the water enters the water inlet pipe (4) through the return pipe (16) after being filtered by the ion exchanger (101).

5. The medium- and high-voltage frequency converter cooling system according to claim 4, characterized in that: The filter element (10) further includes a filter (102) for filtering ion exchanger in water. The filter (102) is connected to the return pipe (16). Water discharged from the outlet of the ion exchanger (101) passes through the filter (102) and enters the inlet pipe (4).

6. The medium- and high-voltage frequency converter cooling system according to claim 4, characterized in that: A control component (17) is connected to the filter pipe (15). The control component (17) is used to detect the conductivity of the water in the filter pipe (15) and control the opening and closing of the filter pipe (15). When the conductivity of the water in the filter pipe (15) is higher than a preset value, the control component (17) drives the filter pipe (15) to open, and the ion exchanger (101) adsorbs ions from the water in the filter pipe (15).

7. The medium- and high-voltage frequency converter cooling system according to claim 1, characterized in that: The water inlet pipe (4) is connected to a pressure gauge (23), which is used to detect the water pressure in the water inlet pipe (4).

8. The medium- and high-voltage frequency converter cooling system according to claim 1, characterized in that: There are two drive components (3), and the water inlet ends of the two drive components (3) are connected to the water inlet pipe (4), and the water outlet ends of the two drive components (3) are connected to the connecting pipe (5).

9. The medium- and high-voltage frequency converter cooling system according to claim 4, characterized in that: It also includes a frame (1), and the drive component (3), cooling component (2) and filter component (10) are all connected to the end face of the frame (1) to form a limit.

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