An explosion-proof water-cooled frequency converter

Abstract

The present invention discloses an explosion-proof water-cooled frequency converter, which relates to the technical field of frequency converters. It includes a box body, a box door, frequency converter components, a controller and an audible and visual alarm. A horizontal plate, a vertical plate and a partition are fixed at the bottom of the box body, which divide the space of the box body into a working cavity, a cooling cavity, a water removal cavity and a buffer cavity. The present invention is provided with a horizontal plate, a vertical plate, a partition, a water-cooling member, a condensate removal member and a driving member. Since the working cavity is a relatively enclosed space, and the moisture in the air is condensed and continuously discharged from the working cavity through the condensate removal member, thereby reducing the moisture in the air in the working cavity, avoiding the corrosion or short circuit of the frequency converter components caused by high-humidity air, reducing the service life of the frequency converter and improving the stability of the device operation.

Description

Technical Field

[0001] The present invention relates to the technical field of frequency converters, and particularly to an explosion-proof water-cooled frequency converter. Background Technique

[0002] A frequency converter is a power control device that uses the on-off action of power semiconductor devices to convert the power frequency power supply into electrical energy of another frequency. Its main function is to convert alternating current into direct current, and then convert direct current into alternating current. As the power of frequency converters in coal mines increases, the traditional air-cooled heat dissipation method can no longer meet the requirements, and the water-cooled heat dissipation method is becoming more and more common. At present, there are mainly two water-cooled heat dissipation methods for underground explosion-proof frequency converters. One is the external water supply cooling method, and the other is the internal water circulation cooling method.

[0003] Chinese invention patent, application publication number CN118659307A discloses an explosion-proof frequency converter with a water-cooled structure. By setting a protection mechanism and a drying mechanism, after the cooling pipe leaks, the power supply of the frequency converter components during operation can be cut off to protect the frequency converter components. At the same time, the isolation between the frequency converter components and the cooling pipe can be realized, reducing the contact between water and the frequency converter components, and further protecting the frequency converter components. When the cooling pipe leaks, the flashing of the flashing light can remind the staff to deal with the leakage phenomenon in time, further reducing the damage of the leakage to the frequency converter components. By drying the air, the condensation on the surface of the cooling pipe caused by the temperature difference can be reduced, further reducing the contact between water and the frequency converter components, and protecting the frequency converter components again.

[0004] The above solution solves the technical problems proposed in its background technology. However, in actual applications, the above solution and existing explosion-proof water-cooled frequency converters still have certain defects. For example:

[0005] First of all, in order to cool the frequency converter components in the explosion-proof box, the explosion-proof box is generally not closed, and the outside air with high humidity will enter the explosion-proof box, which will cause corrosion or short circuit of the components, reducing the service life of the frequency converter and the operating stability.

[0006] Secondly, when the cooling water pipe bursts, in order to prevent water from contacting the frequency converter components, the circuit needs to be immediately disconnected for shutdown and maintenance, which will affect production and reduce production efficiency. Summary of the Invention

[0007] The purpose of the present invention is to provide an explosion-proof water-cooled frequency converter to solve the problems proposed in the above background technology.

[0008] To achieve the above object, the present invention provides the following technical solutions: An explosion-proof water-cooled frequency converter, comprising a box body, a box door, frequency converter components, a controller and an audible and visual alarm. A cross plate, a vertical plate and a partition plate are fixed at the bottom of the box body, which divide the space of the box body into a working cavity, a cooling cavity, a water removal cavity and a buffer cavity;

[0009] Temperature sensors, humidity sensors and a first air pressure sensor are fixed on the side wall of the working cavity, and the temperature sensors, humidity sensors and the first air pressure sensor are all electrically connected to the controller;

[0010] A water-cooling component is arranged in the cooling cavity, and heat exchange and cooling of the gas in the working cavity are realized through the water-cooling component;

[0011] A water outlet groove is formed on the plate body of the partition plate, a condensate removal component is arranged in the water removal cavity, and a driving component is arranged outside the condensate removal component, and the condensate generated by the water-cooling component is removed by the condensate removal component;

[0012] A drain pipe and a water quantity indicating component communicated with the water removal cavity are arranged at the bottom of the box body, and the water quantity in the water removal cavity is detected through the water quantity indicating component;

[0013] A fan hole is formed on the plate body of the vertical plate, and an electronic fan is fixed in the fan hole;

[0014] An air inlet assembly is arranged on the top of the cross plate, and a plurality of cold air outlet pipes communicated with the buffer cavity are fixed on the top of the vertical plate. After the electronic fan is turned on, the air in the working cavity enters the cooling cavity through the air inlet assembly;

[0015] The water-cooling component includes a water inlet pipe and a water outlet pipe, the water inlet pipe and the water outlet pipe are fixedly communicated with a refrigeration water tank, a water pump is connected to the pipe body of the water inlet pipe, and a curved pipe is formed between the water inlet pipe and the water outlet pipe, and the curved pipe is located in the cooling cavity.

[0016] Furthermore, the condensate removal component includes a water scraping ring movably inserted into the curved pipe, a movable plate is fixed at the top end of the water scraping ring, a reciprocating lead screw and a guide rod are movably connected between the inner walls on both sides of the cooling cavity, and the reciprocating lead screw and the guide rod are movably screwed and movably inserted into the movable plate respectively;

[0017] A second rotating shaft and two parallel first rotating shafts are movably connected to the side plate of the water removal cavity, a water absorption belt is connected between the second rotating shaft and the two first rotating shafts, the top water absorption belt is located directly below the water outlet groove and contacts the bottom end of the partition plate;

[0018] A fixed rod is fixed on the side plate of the water removal cavity, a scraper is fixed on the rod body of the fixed rod, and the top plate body of the scraper is pressed against the water absorption belt.

[0019] Furthermore, the driving component includes a worm gear fixed on the rod body of the reciprocating lead screw and a worm movably connected to the box body, and the worm is meshed with the worm gear;

[0020] A second pulley is fixed on each of the two first rotating shaft bodies extending out of the box body. A second belt is connected between the two second pulleys. A fixing plate is fixed on the side of the box body. A motor is fixed on the plate body of the fixing plate. The output end of the motor is fixed to the end of the first rotating shaft.

[0021] A first pulley is fixed on one of the first rotating shaft bodies and on the worm rod body extending out of the box body. A first belt is connected between the two first pulleys.

[0022] Further, the water quantity indicating member is a liquid flow meter, which is connected to the pipe body of the drain pipe.

[0023] Further, the air inlet assembly includes an annular outer shell. Two extension plates are formed on the inner side of the annular outer shell. A support plate is fixed between the inner walls of the annular outer shell. A vertical rod is fixed to the top end of the support plate. A water blocking plate is fixed to the top end of the vertical rod. An insertion plate is formed on the outer side of the water blocking plate. The insertion plate extends into the U-shaped groove formed by the two extension plates.

[0024] Further, the top plate body of the water blocking plate is curved.

[0025] Further, a gas dispersion member is provided on the side wall of the box body to disperse the cold air discharged through the cold air outlet pipe.

[0026] Further, the gas dispersion member includes a connecting plate. A fixed pipe is fixed on the plate body of the connecting plate. A jack is opened at the bottom of the fixed pipe. The jack is adapted to the cold air outlet pipe.

[0027] The side wall of the fixed pipe is movably connected with a movable shaft. A plurality of windmill blades are fixed on the shaft body of the movable shaft.

[0028] A plurality of connecting rods are fixed on the shaft body of the movable shaft. The end of the connecting rod is fixed to the rotating cylinder. A plurality of inclined air outlet holes are opened on the outer side of the rotating cylinder.

[0029] After the driving force of the cold air is applied to the windmill blades, the movable shaft and the rotating cylinder are driven to rotate by the windmill blades.

[0030] Further, a circular through hole is opened at the top end of the box body. A pressure relief device is arranged on the top of the circular through hole to relieve the pressure generated in the box body due to explosion.

[0031] Further, the pressure relief device includes a bursting disc fixed on the top of the circular through hole. A first grid baffle and a second grid baffle are fixed to the top end of the box body. The first grid baffle and the second grid baffle are located outside the bursting disc.

[0032] A number of pressure relief holes are provided on the plates of the first grid baffle and the second grid baffle, and the pressure relief holes on the plates of the first grid baffle and the second grid baffle are staggered.

[0033] The tops of the first grid baffle and the second grid baffle are fixed with a top cover. The inner wall of the top cover is fixed with a second air pressure sensor. A vertical groove is provided on the outer side of the top cover. A folding sealing cloth is fixed in the vertical groove. The bottom end of the folding sealing cloth is fixed with a counterweight. An electromagnet is fixed on the outer side of the top cover.

[0034] The electromagnet and the counterweight are magnetically attracted to each other, and the electromagnet is electrically connected to the controller.

[0035] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0036] This explosion-proof water-cooled frequency converter is provided with a horizontal plate, a vertical plate, a partition plate, a water-cooling component, a condensate removal component and a driving component. Since the working cavity is a relatively enclosed space, and the moisture in the air is condensed and continuously discharged from the working cavity through the condensate removal component, thereby reducing the moisture in the air in the working cavity, avoiding the corrosion or short circuit of the frequency converter components caused by high-humidity air, improving the service life of the frequency converter and improving the stability of the operation of the device.

[0037] At the same time, an air intake assembly is provided. When the top of the curved pipe bursts, the sprayed water will be blocked by the bottom extension plate and the plug plate. Even if some water splashes out from the gap formed by the plug plate and the top extension plate, the curved plate body at the top of the water baffle will also block the splashed water. The blocked water flows back into the cooling cavity through the water baffle, so that it will not enter the working cavity, effectively preventing the frequency converter components from contacting with water. In this way, when the curved pipe bursts, there is no need to immediately disconnect the circuit for shutdown and maintenance, reducing the impact on production and improving production efficiency.

[0038] Secondly, a gas dispersion component is provided on the side wall of the box body to disperse the cold air discharged through the cold air outlet pipe. First, since the air flow will diffuse to the outside of the rotating cylinder, the coverage range of the air flow is increased. Second, the air flow disturbs the air in the working cavity, increasing the heat exchange efficiency between the air in the working cavity and the frequency converter components, and thus improving the heat exchange effect on the frequency converter components.

[0039] In addition, a pressure relief device is provided. First, the pressure relief device relieves the pressure generated by the explosion in the box body, improving the safety of the device. Second, after the pressure relief device works, the folding sealing cloth on the pressure relief device is in an unfolded state, realizing the sealing of the working cavity. The burning frequency converter components or other electrical components in the box body will go out due to the exhaustion of oxygen in the working cavity, thereby improving the fire safety of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 Right side axonometric view of the present invention;

[0041] Figure 2 Left rear axonometric view of the present invention;

[0042] Figure 3 Right side axonometric view of the present invention after removing the box door of the box body;

[0043] Figure 4 Left side axonometric view of the present invention after removing the box door of the box body;

[0044] Figure 5 Bottom view of the present invention after removing the box door of the box body;

[0045] Figure 6 Half-sectional view of the present invention;

[0046] Figure 7 Axonometric view of the condensate removal part of the present invention;

[0047] Figure 8 Axonometric view of the driving part of the present invention;

[0048] Figure 9 Half-sectional view of the air intake assembly of the present invention;

[0049] Figure 10 Half-sectional view of the gas dispersion part of the present invention;

[0050] Figure 11 Half-sectional view of the pressure relief device of the present invention.

[0051] In the figure: 1. Box body; 201. Horizontal plate; 202. Vertical plate; 2021. Electric fan; 203. Partition board; 204. Water outlet groove; 3. Inverter components; 4. Water-cooling part; 401. Water inlet pipe; 402. Curved pipe; 5. Condensate removal part; 501. Guide rod; 502. Reciprocating lead screw; 503. Movable plate; 504. Water scraping ring; 505. First rotating shaft; 506. Second rotating shaft; 507. Absorbent belt; 508. Fixed rod; 509. Scraper; 6. Drain pipe; 7. Liquid flowmeter; 8. Driving part; 801. Worm gear; 802. Worm; 803. First pulley; 804. First belt; 805. Second pulley; 806. Second belt; 807. Fixed plate; 808. Motor; 9. Air intake component; 901. Annular outer shell; 902. Extension plate; 903. Support plate; 904. Vertical rod; 905. Water baffle; 906. Insert plate; 10. Cold air outlet pipe; 11. Gas dispersion part; 111. Connecting plate; 112. Fixed pipe; 113. Movable shaft; 114. Windmill blades; 115. Rotating cylinder; 116. Air outlet hole; 117. Connecting rod; 12. Pressure relief device; 121. Bursting disc; 122. First grid baffle; 123. Second grid baffle; 124. Top cover; 125. Counterweight; 126. Folding sealing cloth; 127. Electromagnet; 13. Temperature sensor; 14. Humidity sensor; 15. First air pressure sensor; 16. Sound and light alarm. Specific embodiments

[0052] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0053] Embodiment 1: As Figures 1 - 9 shown, the present invention provides a technical solution: an explosion-proof water-cooled inverter, including a box body 1, a box door, inverter components 3, a controller, and a sound and light alarm 16 electrically connected to the controller. A horizontal plate 201, a vertical plate 202, and a partition board 203 are fixed at the bottom of the box body 1, which divide the space of the box body 1 into a working chamber, a cooling chamber, a water removal chamber, and a buffer chamber. When the box door is closed, the working chamber, the cooling chamber, the water removal chamber, and the buffer chamber are all closed spaces. A temperature sensor 13, a humidity sensor 14, and a first air pressure sensor 15 are fixed on the side wall of the working chamber, and the temperature sensor 13, the humidity sensor 14, and the first air pressure sensor 15 are all electrically connected to the controller. It should be noted that the functions of the temperature sensor 13, the humidity sensor 14, and the first air pressure sensor 15 are to detect the temperature, humidity, and air pressure in the working chamber respectively, and the detected data are transmitted to the controller in real time.

[0054] A water-cooling component 4 is arranged in the cooling cavity, and heat exchange and cooling of the working cavity gas are achieved through the water-cooling component 4. Specifically, as Figure 6 and Figure 7 shown, the water-cooling component 4 includes a water inlet pipe 401 and a water outlet pipe. The water inlet pipe 401 and the water outlet pipe are fixedly communicated with the refrigeration water tank. Among them, the refrigeration water tank can be a water tank with a built-in refrigerator, and the water in the tank is cooled by the built-in refrigerator, or it can be a heat exchanger, and the water in the tank is cooled by exchanging heat with external cold water to realize the refrigeration of the water in the tank. This is prior art and will not be elaborated in this solution. A water pump is connected to the pipe body of the water inlet pipe 401, and the suction of the water pump is used to make the water in the refrigeration water tank flow into the water inlet pipe 401. To increase the refrigeration efficiency, a curved pipe 402 is formed between the water inlet pipe 401 and the water outlet pipe located in the cooling cavity. An installation plate and a clamp are fixed on the side wall of the cooling cavity, and the outer pipe body of the curved pipe 402 is fixed by the clamp to improve the placement stability of the water inlet pipe 401 in the cooling cavity.

[0055] In addition, as Figure 6 shown, to improve the heat exchange efficiency, the curved pipe 402 is located in the middle of the cooling cavity, and there is a certain space between it and the top and bottom of the cooling cavity.

[0056] A water outlet groove 204 is opened on the plate body of the partition plate 203. To facilitate the water condensed by the water-cooling component 4 to flow into the water outlet groove 204, the plate body at the top of the partition plate 203 is inclined towards the water outlet groove 204 (i.e., a slope is formed). A condensate removal component 5 is arranged in the water removal cavity, and a driving component 8 is arranged outside the condensate removal component 5, and the condensate generated by the water-cooling component 4 is removed by the condensate removal component 5.

[0057] Among them, as Figures 6 - 8 shown, the condensate removal component 5 includes a water scraping ring 504 that is movably inserted into the curved pipe 402. A movable plate 503 is fixed at the top end of the water scraping ring 504. In this way, when the movable plate 503 moves left and right on the pipe body of the curved pipe 402, the condensate drops adhered to the pipe body of the curved pipe 402 are scraped off by the water scraping ring 504.

[0058] As Figure 7 shown, a reciprocating lead screw 502 and a guide rod 501 are movably connected between the inner walls on both sides of the cooling cavity. The reciprocating lead screw 502 and the guide rod 501 are movably screwed and movably inserted into the movable plate 503 respectively. In this way, when the reciprocating lead screw 502 rotates, the movable plate 503 is guided by the guide rod 501 to realize the reciprocating movement of the movable plate 503 along the pipe body of the curved pipe 402.

[0059] A second rotating shaft 506 and two parallel first rotating shafts 505 are movably connected to the side plate of the water removal chamber. A water absorption belt 507 is connected between the second rotating shaft 506 and the two first rotating shafts 505. It should be noted that the top water absorption belt 507 is located directly below the water outlet groove 204 and contacts the bottom end of the partition plate 203, thereby blocking the water outlet groove 204 and reducing the entry of external air into the cooling chamber.

[0060] In this solution, the water absorption belt 507 can be made of cotton material, polymer material or non-woven fabric, and is used to adsorb the water flowing in and out of the water outlet groove 204. A fixed rod 508 is fixed on the side plate of the water removal chamber. A scraper 509 is fixed on the rod body of the fixed rod 508, and the top plate body of the scraper 509 is pressed against the water absorption belt 507. In this way, when the water absorption belt 507 rotates, the water absorption belt 507 adsorbs the water flowing in and out of the water outlet groove 204, and the water adsorbed on the water absorption belt 507 is separated from the water absorption belt 507 under the extrusion of the scraper 509 and enters the water removal chamber. It can be known that since the working chamber is a relatively closed space and the moisture in the air is condensed and continuously discharged from the working chamber through the condensate removal member 5, the moisture in the air in the working chamber is reduced, avoiding the corrosion or short circuit of the inverter components caused by high-humidity air, improving the service life of the inverter and the stability of the device operation.

[0061] As Figure 7 and Figure 8 shown, the driving member 8 includes a worm gear 801 fixed on the rod body of the reciprocating lead screw 502 and a worm 802 movably connected to the box body 1. The worm 802 meshes with the worm gear 801. Second belt wheels 805 are fixed on the shaft bodies of the two first rotating shafts 505 extending out of the box body 1. A second belt 806 is connected between the two second belt wheels 805. A fixing plate 807 is fixed on the side of the box body 1. A motor 808 electrically connected to the controller is fixed on the plate body of the fixing plate 807, and the output end of the motor 808 is fixed to the end of the first rotating shaft 505. First belt wheels 803 are fixed on the shaft body of one of the first rotating shafts 505 and the rod body of the worm 802 extending out of the box body 1. A first belt 804 is connected between the two first belt wheels 803.

[0062] After starting the motor 808, under the driving action of the second belt 806 and the first belt 804, the movement of the water absorption belt 507 and the reciprocating movement of the movable plate 503 on the body of the curved tube 402 are realized.

[0063] In addition, in this solution, only one driving motor is used to realize the operation of the condensate removal member 5, which can reduce the manufacturing cost of the device.

[0064] It can be understood that when the curved tube 402 bursts, a large amount of water will enter the water removal cavity through the water absorption belt 507. To detect the amount of water and thus know whether the curved tube 402 has burst, as Figure 2 and Figure 4 shown, a drain pipe 6 communicating with the water removal cavity and a water volume indicating member electrically connected to the controller are provided at the bottom of the box body 1. Among them, the water volume indicating member can be a water level sensor installed in the water removal cavity or a liquid flow meter 7 connected to the pipe body of the drain pipe 6. In this solution, to improve the detection sensitivity and facilitate installation, the water volume indicating member is preferably the liquid flow meter 7. When the liquid flow meter 7 detects that the amount of water discharged from the drain pipe 6 reaches the threshold value, the controller controls the sound and light alarm 16 to give an alarm, thereby reminding the staff to carry out maintenance.

[0065] As Figure 5 shown, a fan hole is formed on the plate body of the vertical plate 202, and an electronic fan 2021 is fixed in the fan hole. After the electronic fan 2021 is started, the air in the working cavity is circulated.

[0066] As Figure 3 and Figure 9 shown, an air intake assembly 9 is provided at the top of the horizontal plate 201. As Figure 4 shown, a plurality of cold air outlet pipes 10 communicating with the buffer cavity are fixed at the top of the vertical plate 202. After the electronic fan 2021 is started, the air in the working cavity enters the cooling cavity through the air intake assembly 9. The hot air exchanges heat with the water-cooled member 4 in the cooling cavity and then enters the buffer cavity, and finally is discharged into the working cavity through the cold air outlet pipes 10, realizing the cooling of the frequency converter components in the working cavity.

[0067] Specifically, as Figure 9 shown, the air intake assembly 9 includes an annular outer shell 901. Two extension plates 902 are formed inside the annular outer shell 901. A support plate 903 is fixed between the inner walls of the annular outer shell 901. A vertical rod 904 is fixed at the top of the support plate 903, and a water baffle 905 is fixed at the top of the vertical rod 904. An insertion plate 906 is formed outside the water baffle 905. The insertion plate 906 extends into the U-shaped groove formed by the two extension plates 902, and the length of the insertion plate 906 extending into the U-shaped groove is 1 / 3 of the length of the U-shaped groove. In this way, since there is a large gap between the insertion plate 906 and the side wall of the U-shaped groove, the airflow entering the air intake assembly 9 will not be blocked.

[0068] It should be noted that when the top of the curved tube 402 bursts, the ejected water will be blocked by the extension plate 902 and the insertion plate 906 at the bottom. In addition, in this solution, the top plate of the water baffle 905 can be set to a curved surface. In this way, even if some water splashes out from the gap formed by the insertion plate 906 and the top extension plate 902, the curved surface plate at the top of the water baffle 905 will also block the splashing water. The blocked water flows back into the cooling cavity through the water baffle 905, and thus will not enter the working cavity, effectively preventing the frequency converter components from contacting water. In this way, when the curved tube 402 bursts, there is no need to immediately disconnect the circuit for shutdown and maintenance, reducing the impact on production and improving production efficiency.

[0069] It should be added that due to the need for maintenance or operation by the staff, after the box door is closed, the outside air will enter the working cavity. The temperature sensor 13, humidity sensor 14, and first air pressure sensor 15 are used to detect the temperature, humidity, and air pressure in the working cavity respectively. The detected data is transmitted to the controller in real time. When the temperature in the working cavity is higher than the set value, the controller controls the electronic fan 2021 to start, and cools the working cavity through the water cooling part 4. When the humidity value in the working cavity exceeds the set value, the controller drives the driving part 8 to start, and the moisture in the air condenses and is continuously discharged from the working cavity through the condensate removal part 5, thereby reducing the moisture in the air in the working cavity. When the air pressure in the working cavity is higher than the set value, the controller controls the sound and light alarm 16 to give an alarm.

[0070] Embodiment 2: On the basis of Embodiment 1, as Figure 4 and Figure 10 shown, a gas dispersion part 11 is provided on the side wall of the box body 1. The cold air discharged through the cold air outlet pipe 10 is dispersed by the gas dispersion part 11, thereby improving the heat exchange effect between the cold air and the frequency converter components.

[0071] Specifically, the gas dispersion part 11 includes a connecting plate 111. A fixed pipe 112 is fixed on the plate body of the connecting plate 111. A jack is opened at the bottom of the fixed pipe 112, and the jack is adapted to the cold air outlet pipe 10. In this way, the gas dispersion part 11 is a separate installation component and is not fixed to the cold air outlet pipe 10. In this way, when the gas dispersion part 11 is damaged, it can be replaced separately without affecting the air output of the cold air outlet pipe 10.

[0072] A movable shaft 113 is movably connected to the side wall of the fixed pipe 112. A plurality of windmill blades 114 are fixed on the shaft body of the movable shaft 113. A rotating cylinder 115 is fixed to the shaft body of the movable shaft 113 through a plurality of connecting rods 117. The rotating cylinder 115 coincides with the central axis of the fixed pipe 112 and can rotate relative to the fixed pipe 112. A plurality of inclined air outlet holes 116 are formed on the outer side of the rotating cylinder 115. Specifically, during operation, after the driving force of the cold air is applied to the windmill blades 114, the movable shaft 113 and the rotating cylinder 115 are driven to rotate by the windmill blades 114. Since the air outlet holes 116 are inclined outward on the rotating cylinder 115, when the rotating cylinder 115 rotates, the air flow will diffuse to the outside of the rotating cylinder 115, increasing the coverage area of the air flow. In addition, as the rotating cylinder 115 rotates, the air flow disturbs the air in the working chamber, increasing the heat exchange efficiency between the air in the working chamber and the frequency converter components, thereby improving the heat exchange effect on the frequency converter components.

[0073] Embodiment 3: When the frequency converter components in the box body 1 explode, the air pressure in the box body 1 rises sharply. To prevent the air pressure from damaging the outer shell of the box body 1 and other components in the box body 1, on the basis of Embodiment 1 or Embodiment 2, as Figure 1 and Figure 11 shown, a circular through-hole is formed at the top of the box body 1, and a pressure relief device 12 is arranged at the top of the circular through-hole. The pressure relief device 12 relieves the pressure generated in the box body 1 due to the explosion.

[0074] Specifically, as Figure 11 shown, the pressure relief device 12 includes a bursting disc 121 fixed to the top of the circular through-hole. The bursting disc 121 can be made of a metal film, a polymer film or other composite materials, and its applicable pressure depends on the number and volume of the electrical components in the box body 1. A first grid baffle 122 and a second grid baffle 123 are fixed to the top of the box body 1. The first grid baffle 122 and the second grid baffle 123 are located outside the bursting disc 121. A plurality of pressure relief holes are formed on the plates of the first grid baffle 122 and the second grid baffle 123, and the pressure relief holes on the plates of the first grid baffle 122 and the second grid baffle 123 are staggered. In this way, when the bursting disc 121 bursts, the first grid baffle 122 and the second grid baffle 123 block the generated fragments while not affecting the pressure relief, preventing the fragments from hurting people and improving the safety of using the device.

[0075] In addition, a top cover 124 is fixed to the tops of the first partition baffle 122 and the second partition baffle 123. A second air pressure sensor electrically connected to the controller is fixed to the inner wall of the top cover 124. A vertical groove is formed in the outer side of the top cover 124, and a folding sealing cloth 126 is fixed in the vertical groove. The folding sealing cloth 126 can be made of non-woven fabric coated with flame retardant material and silicone rubber material, so as to improve the fireproof performance and sealing performance of the folding sealing cloth 126. A counterweight 125 is fixed to the bottom end of the folding sealing cloth 126, and an electromagnet 127 is fixed to the outer side of the top cover 124. The energized electromagnet 127 attracts the counterweight 125. In this way, when the bursting disc 121 bursts, the second air pressure sensor detects a pressure change. At this time, the controller controls the electromagnet 127 to power off, and the counterweight 125 moves downward under the action of its gravity until it contacts the top surface of the box body 1. At this time, the folding sealing cloth 126 is in an unfolded state, realizing the sealing of the working chamber. The burning frequency converter components or other electrical components in the box body 1 will go out due to the exhaustion of oxygen in the working chamber, thereby improving the fireproof safety of the device.

[0076] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended embodiments and their equivalents.

Claims

1. An explosion-proof water-cooled frequency converter, comprising a box body (1), a box door, frequency converter components (3), a controller and an audible and visual alarm (16), characterized in that: A horizontal plate (201), a vertical plate (202) and a partition plate (203) are fixed to the bottom of the box body (1), which divide the space of the box body (1) into a working chamber, a cooling chamber, a water removal chamber and a buffer chamber; A temperature sensor (13), a humidity sensor (14) and a first air pressure sensor (15) are fixed to the side wall of the working chamber. The temperature sensor (13), the humidity sensor (14) and the first air pressure sensor (15) are all electrically connected to the controller; A water-cooling component (4) is arranged in the cooling chamber, and heat exchange and cooling of the gas in the working chamber are achieved through the water-cooling component (4); A water outlet groove (204) is formed on the plate body of the partition plate (203). A condensate removal component (5) is arranged in the water removal chamber, and a driving component (8) is arranged outside the condensate removal component (5). The condensate generated by the water-cooling component (4) is removed through the condensate removal component (5); A drain pipe (6) and a water quantity indicating component, which are communicated with the water removal chamber, are arranged at the bottom of the box body (1). The water quantity in the water removal chamber is detected through the water quantity indicating component; A fan hole is formed on the plate body of the vertical plate (202), and an electronic fan (2021) is fixed in the fan hole; An air inlet component (9) is arranged at the top of the horizontal plate (201), and a plurality of cold air outlet pipes (10) communicated with the buffer chamber are fixed to the top of the vertical plate (202). After the electronic fan (2021) is turned on, the air in the working chamber enters the cooling chamber through the air inlet component (9); The water-cooling component (4) includes a water inlet pipe (401) and a water outlet pipe. The water inlet pipe (401) and the water outlet pipe are fixedly communicated with a refrigeration water tank. A water pump is connected to the pipe body of the water inlet pipe (401). A curved pipe (402) is formed between the water inlet pipe (401) and the water outlet pipe, and the curved pipe (402) is located in the cooling chamber; The condensate removal component (5) includes a water scraping ring (504) movably inserted into the curved pipe (402). A movable plate (503) is fixed to the top end of the water scraping ring (504). A reciprocating lead screw (502) and a guide rod (501) are movably connected between the two inner side walls of the cooling chamber. The reciprocating lead screw (502) and the guide rod (501) are movably screwed and movably inserted into the movable plate (503) respectively; A second rotating shaft (506) and two parallel first rotating shafts (505) are movably connected to the side plate of the water removal chamber. A water absorption belt (507) is connected between the second rotating shaft (506) and the two first rotating shafts (505). The top water absorption belt (507) is located directly below the water outlet groove (204) and is in contact with the bottom end of the partition plate (203); A fixed rod (508) is fixed to the side plate of the water removal chamber, and a scraper (509) is fixed to the rod body of the fixed rod (508). The top plate body of the scraper (509) is pressed against the water absorption belt (507); 2. The explosion-proof water-cooled frequency converter according to claim 1, wherein: The driving component (8) includes a worm gear (801) fixed to the rod body of the reciprocating lead screw (502) and a worm (802) movably connected to the box body (1). The worm (802) is meshed with the worm gear (801); On the shafts of two first rotating shafts (505) extending out of the box body (1), second belt pulleys (805) are fixed. A second belt (806) is connected between the two second belt pulleys (805). A fixing plate (807) is fixed on the side of the box body (1). A motor (808) is fixed on the plate body of the fixing plate (807). The output end of the motor (808) is fixed to the end of the first rotating shaft (505). On the shaft of one of the first rotating shafts (505) and on the rod body of a worm (802) extending out of the box body (1), first belt pulleys (803) are fixed. A first belt (804) is connected between the two first belt pulleys (803).

3. An explosion-proof water-cooled frequency converter according to claim 1, characterized in that: The water quantity indicating member is a liquid flow meter (7), which is connected to the pipe body of the drain pipe (6).

4. An explosion-proof water-cooled frequency converter according to claim 1, characterized in that: The air inlet assembly (9) includes an annular outer shell (901). Two extension plates (902) are formed on the inner side of the annular outer shell (901). A support plate (903) is fixed between the inner walls of the annular outer shell (901). A vertical rod (904) is fixed to the top end of the support plate (903). A water baffle (905) is fixed to the top end of the vertical rod (904). An insertion plate (906) is formed on the outer side of the water baffle (905). The insertion plate (906) extends into the U-shaped groove formed by the two extension plates (902).

5. The explosion-proof water-cooled frequency converter according to claim 4, characterized in that: The top plate body of the water baffle (905) is curved.

6. The explosion-proof water-cooled frequency converter according to claim 1, characterized in that: A gas dispersion member (11) is provided on the side wall of the box body (1). The cold air discharged through the cold air outlet pipe (10) is dispersed by the gas dispersion member (11).

7. An explosion-proof water-cooled frequency converter according to claim 6, characterized in that: The gas dispersion member (11) includes a connecting plate (111). A fixed pipe (112) is fixed on the plate body of the connecting plate (111). A jack is opened at the bottom of the fixed pipe (112), and the jack is adapted to the cold air outlet pipe (10). A movable shaft (113) is movably connected to the side wall of the fixed pipe (112). A plurality of windmill blades (114) are fixed on the shaft of the movable shaft (113). A plurality of connecting rods (117) are fixed on the shaft of the movable shaft (113). The end of the connecting rod (117) is fixed to a rotating cylinder (115). A plurality of inclined air outlet holes (116) are opened on the outer side of the rotating cylinder (115). After the driving force of the cold air is applied to the windmill blades (114), the windmill blades (114) drive the movable shaft (113) and the rotating cylinder (115) to rotate.

8. An explosion-proof water-cooled frequency converter according to claim 1, characterized in that: A circular through hole is opened at the top end of the box body (1). A pressure relief device (12) is arranged on the top of the circular through hole. The pressure generated in the box body (1) due to explosion is relieved by the pressure relief device (12).

9. The explosion-proof water-cooled frequency converter according to claim 8, wherein: The pressure relief device (12) includes a bursting disc (121) fixed on the top of the circular through hole. A first grid baffle (122) and a second grid baffle (123) are fixed to the top end of the box body (1). The first grid baffle (122) and the second grid baffle (123) are located outside the bursting disc (121). A plurality of pressure relief holes are opened on the plate bodies of the first grid baffle (122) and the second grid baffle (123). The pressure relief holes on the plate bodies of the first grid baffle (122) and the second grid baffle (123) are staggered. The top ends of the first grid baffle (122) and the second grid baffle (123) are fixed with a top cover (124). A second air pressure sensor is fixed to the inner wall of the top cover (124). A vertical groove is formed on the outer side of the top cover (124). A folding sealing cloth (126) is fixed in the vertical groove. The bottom end of the folding sealing cloth (126) is fixed with a counterweight (125). An electromagnet (127) is fixed to the outer side of the top cover (124). The electromagnet (127) is magnetically attracted to the counterweight (125), and the electromagnet (127) is electrically connected to the controller.

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