Alternating current low voltage switchgear and control method thereof

Abstract

The application discloses an alternating current low-voltage switch cabinet and a control method thereof, wherein the alternating current low-voltage switch cabinet comprises a sealed cabinet body installed on the ground and an electric control unit installed in the sealed cabinet body; at least two air control chambers are arranged in the space between the electric control unit and the rear side wall of the sealed cabinet body, the structures of all the air control chambers are the same, the shape of the air duct in each air control chamber is a U-shaped type, and a water storage bend is formed at the bottom of each air duct. An upper ultrasonic atomization sheet and a lower ultrasonic atomization sheet are arranged at the bottom of each air duct, the upper ultrasonic atomization sheet is higher than the corresponding water storage bend, and the lower ultrasonic atomization sheet is arranged in the water storage bend; a water storage pool is installed underground, and the water in the water storage pool is circulated between each water storage bend and the water storage pool through a circulating pipeline. The application utilizes the water mist formed by underground water to reduce the temperature or increase the temperature, consumes less electric energy, and is beneficial to the operation and maintenance cost of an outdoor new energy automobile charging station.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of new energy automobile charging station equipment, and particularly relates to an alternating current low-voltage switch cabinet and a control method thereof. BACKGROUND

[0002] With the increasing number of new energy vehicles, the demand for charging is increasing, and new energy vehicle charging stations are being continuously expanded. Outdoor charging stations are more than indoor charging stations due to the following reasons: outdoor charging stations can utilize open spaces such as roadside, square, and open parking lot, and do not need to build a special indoor space. In areas where land resources are relatively abundant, the cost of obtaining a site is low. Secondly, the outdoor environment is well ventilated, which is conducive to heat dissipation of charging pile equipment, reduces the probability of equipment failure caused by overheating, prolongs the service life of the equipment, and reduces the operation and maintenance cost. However, the power of new energy vehicle charging stations is getting larger and larger. In order to meet the large power supply requirements of charging stations, at least one dedicated alternating current low-voltage switch cabinet is provided for the charging station. However, the current outdoor alternating current low-voltage switch cabinet has some deficiencies

[0003] 1. The optimal working temperature of the switch cabinet is usually between 5℃ and 40℃. In order to solve the problem of heat dissipation in summer, the existing outdoor new energy vehicle charging station switch cabinet is equipped with a special air conditioning system. However, the air conditioning system itself has high energy consumption, which is not conducive to controlling the operation and maintenance cost of the outdoor new energy vehicle charging station. In addition to the above heat dissipation problem, there is a problem of too low temperature in winter. The performance of electrical components in the switch cabinet, such as circuit breakers, contactors, and relays, will be affected. For example, the action time of some relays may be longer, the viscosity of the lubricating oil increases, and the normal operation of the mechanism is affected. In order to solve the problem of low temperature, the conventional treatment method is to increase the electric heating device in the cabinet body. However, the electric heating device, like the air conditioning system, also has the problem of high energy consumption. In view of the energy consumption problem, there is a method of using geothermal resources to reduce energy consumption, for example, the patent with the application number CN201320867649.4 discloses a preinstalled transformer substation with a heat dissipation function box. It has a simple structure, and through the combination of cooling water atomizing head heat exchange and air exchange fan, low-temperature air can effectively reduce the temperature inside the box, and reduce the energy consumption and cost of air conditioning cooling. However, most new energy vehicle charging stations consider charging safety, site cost, and other factors. Most new energy vehicle charging stations in the future are open-air charging stations, and are adjacent to highways for easy charging, such as new energy vehicle charging stations for high-speed servers. The amount of dust in these places is large, and the dust in the air mixes with the circulating water. If it is operated for a long time, the dust content in the sealed cooling chamber is large, causing the nozzle and pipeline to be blocked. Therefore, the preinstalled transformer substation with a heat dissipation function box has the defect of not setting a filter device.

[0004] 2. In areas where the temperature is not particularly high or low throughout the year, the outdoor charging station switch cabinet is equipped with air cooling. The cabinet has ventilation holes, and heat exchange with the external environment is achieved through a fan. Air cooling consumes less energy, but outdoor dust is heavy, and simple dust screens cannot solve the dust problem, so the cabinet still needs to be cleaned manually regularly.

[0005] 3. In humid regions or during the rainy season, to address the issue of high humidity, existing switchgear adds a drying layer to the dustproof mesh. For example, patent application number 202411552390.3 discloses a photovoltaic power generation distribution cabinet whose filter plate structure consists of a polyester fiber layer sandwiched with an absorbent cotton layer. The absorbent cotton layer can be dried after absorbing water to restore its drying capacity. The principle of dust prevention and dehumidification is to utilize two sets of fans and two sets of filter plates, with the fans rotating in both directions to achieve the reuse of the filter plates. However, as dust gradually increases, the ventilation effect of the polyester fiber layer deteriorates accordingly. While reverse blowing can indeed remove some easily falling dust, stubborn particles such as oil stains are difficult to blow off after adhering to the polyester fiber layer, still requiring regular manual cleaning, resulting in high maintenance costs.

[0006] In summary, there is currently a lack of a dedicated AC low-voltage switchgear for charging stations that can simultaneously achieve heat dissipation and insulation, while also being energy-efficient and dust-free. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides an AC low-voltage switchgear, comprising a sealed cabinet installed on the ground and an electrical control unit installed inside the sealed cabinet; at least two air control chambers are provided in the space between the electrical control unit and the rear wall of the sealed cabinet, all air control chambers have the same structure, and the air duct inside each air control chamber is U-shaped, thus forming a water trap at the bottom of each air duct; a fan is provided at one end of the air duct and faces the electrical control unit, and the other end of the air duct extends downward to the middle of the rear wall, with the air outlet of the air duct exposed outside the sealed cabinet; each air duct has an upper ultrasonic atomizing plate and a lower ultrasonic atomizing plate at its bottom, the upper ultrasonic atomizing plate being higher than the corresponding water trap, and the lower ultrasonic atomizing plate being located in the water trap; each air duct... Each duct is equipped with a reusable drying filter plate, positioned above the corresponding ultrasonic atomizing plate. A transverse dust trap is installed within each duct, located between the ultrasonic atomizing plate and the drying filter plate. The inner surface of each water trap's sidewall is covered with an adhesive cloth, and two drive rollers are located on the outer sidewall. The water trap's sidewall has openings corresponding to the two drive rollers, with the adhesive cloth extending from each opening and wrapping around the corresponding drive rollers. Each opening is equipped with a suitable sealing block. An underground water storage tank is included, with water circulating between each water trap and the tank via a circulation pipe. Each water trap's connection to the circulation pipe is equipped with a filter screen.

[0008] The preferred scheme of the alternating current low-voltage switch cabinet in the application is that the outer surface of the side wall of each water trap is provided with a transverse sliding groove corresponding to each blocking piece, and a telescopic motor connected with the blocking piece is arranged in the transverse sliding groove

[0009] The preferred scheme of the alternating current low-voltage switch cabinet in the application is that each two adjacent air control chambers are communicated through a ventilation pipe, the ventilation pipe is located between the dry filter plate and the corresponding upper ultrasonic atomization piece, and the ventilation pipe is provided with an electromagnetic valve.

[0010] The preferred scheme of the alternating current low-voltage switch cabinet in the application is that the side wall material of the water storage pool is stainless steel, and a water pump in communication with the corresponding circulating pipeline is arranged in the water storage pool.

[0011] The alternating current low-voltage switch cabinet in the application has the following beneficial effects:

[0012] 1. The water storage pool is buried underground, and the underground temperature remains constant all year round. In summer, the water temperature in the water storage pool is much lower than the ambient temperature, and the low-temperature water mist is used to reduce the inlet air temperature and cool the electric control unit, and at the same time, the heat is taken out, and the external circulation cooling is realized.

[0013] 2. In winter, the sealed cabinet body is isolated from the external air, and the water mist with a temperature higher than the ground surface is used to heat the internal circulation air, and the heat absorbed by the water is absorbed by the underground soil.

[0014] 3. In the process of external circulation cooling, the dust in the air is brought into the water storage pool after the external air is mixed with the water mist, and the dust in the air is removed while cooling.

[0015] 4. While utilizing water mist for cooling or heating, the system also captures dust from the air. Due to intermolecular forces, most of the small water droplets in the mist adhere to the dust filter surface as they pass through. These droplets then coalesce into larger droplets, eventually carrying the dust back into the water trap. Some of the dust in the water trap adheres to the adhesive cloth on the side wall of the trap. This adhesive cloth removes the dust, preventing it from sticking to the side wall of the trap and improving the cleaning effect. The dust-adhesive cloth, drive roller, and sealing block work together to automatically complete the cleaning process, solving the problem of high labor costs caused by the need for manual cleaning of conventional dust filters. It also overcomes the technical challenge of incomplete cleaning in existing forward and reverse blowing systems.

[0016] 5. Internal circulation can be achieved by raising the water level and sealing the water trap. External circulation can be achieved by lowering the water level and connecting the water trap to the outside. The system automatically switches between internal and external modes based on weather conditions such as high heat, high humidity, and low temperature, further reducing energy consumption for heat dissipation or insulation. It balances the heat dissipation needs in summer and the warmth requirements in winter, avoiding the high energy consumption issues of existing refrigeration and heating systems, and also features automatic dust removal.

[0017] This invention also provides a control method for an AC low-voltage switchgear. Based on the aforementioned AC low-voltage switchgear, two air control chambers are provided, one of which is the first air control chamber, and the other is the second air control chamber. When the internal temperature of the sealed cabinet is higher than the optimal operating temperature of the electrical control unit, for example in summer, the heat from the electrical control unit needs to be expelled from the sealed cabinet.

[0018] First, the water pump corresponding to the first air control chamber injects an appropriate amount of water into the water trap of the first air control chamber, making the water level level with the lower ultrasonic atomizing plate of the first air control chamber, and the water circulates between the water trap and the water tank; the lower ultrasonic atomizing plate is activated to spray water mist, the fan starts and rotates forward, and outside air enters the air duct of the first air control chamber, mixes with the water mist and is cooled, and then passes through the drying filter plate and enters the sealed cabinet. The fan of the second air control chamber starts and rotates in reverse, and the heat inside the sealed cabinet is discharged with the air after passing through the drying filter plate in the air duct of the second air control chamber.

[0019] When the drying filter plate of the first air control chamber is saturated with water, the water pump corresponding to the first air control chamber causes all the water in the water storage bend of the first air control chamber to be discharged into the water storage pool, the lower ultrasonic atomizing sheet stops, the fan of the first air control chamber reverses to seal the heat in the cabinet, the heat in the cabinet is discharged after the air passes through the drying filter plate in the air duct of the first air control chamber, the drying filter plate is heated and gradually recovers the water absorption capacity, if the heat in the cabinet is not enough to dry the drying filter plate, the electric heating wire of the first air control chamber is started to heat up until the drying filter plate recovers the water absorption capacity. The water pump corresponding to the second air control chamber injects an appropriate amount of water into the water storage bend of the second air control chamber, so that the water level is flush with the lower ultrasonic atomizing sheet of the second air control chamber, and the water circulates between the water storage bend and the water storage pool; the fan of the second air control chamber rotates forward, external air enters the air duct of the second air control chamber and is mixed with water mist to cool down, and then passes through the drying filter plate and enters the cabinet.

[0020] When the drying filter plate of the second air control chamber is saturated with water, the water pump corresponding to the first air control chamber causes all the water in the water storage bend of the first air control chamber to be discharged into the water storage pool, the lower ultrasonic atomizing sheet stops, the fan of the second air control chamber reverses, the heat in the cabinet is discharged after the air passes through the drying filter plate in the air duct of the second air control chamber, the drying filter plate is heated and recovers the water absorption capacity, if the heat in the cabinet is not enough to dry the drying filter plate, the electric heating wire of the second air control chamber is started to heat up until the drying filter plate recovers the water absorption capacity. The water pump corresponding to the first air control chamber injects an appropriate amount of water into the water storage bend of the first air control chamber, so that the water level is flush with the lower ultrasonic atomizing sheet of the first air control chamber, and the water circulates between the water storage bend and the water storage pool; the fan of the first air control chamber rotates forward, external air enters the air duct of the first air control chamber and is mixed with water mist to cool down, and then passes through the drying filter plate and enters the cabinet;

[0021] Finally, repeat the above steps until the internal temperature of the sealed cabinet is not higher than the optimal working temperature of the electric control unit.

[0022] The application also provides another control method for an alternating current low-voltage switch cabinet, based on the above-mentioned alternating current low-voltage switch cabinet, the air control chamber is provided with two, one of which is the first air control chamber, and the other is the second air control chamber, when the internal temperature of the sealed cabinet is lower than the optimal working temperature of the electric control unit, the steps are as follows:

[0023] Firstly, the water pump corresponding to the first air control chamber injects appropriate amount of water into the water trap of the first air control chamber, the water trap stores water, the water level is flush with the upper ultrasonic atomizing piece of the first air control chamber, and the water circulates between the water trap and the water storage pool. The upper ultrasonic atomizing piece starts to spray water mist, and the fan starts and rotates forward. The water pump corresponding to the second air control chamber injects appropriate amount of water into the water trap of the second air control chamber, the water trap stores water, the water level is flush with the upper ultrasonic atomizing piece of the second air control chamber, and the water circulates between the water trap and the water storage pool. The fan starts and reverses; the electromagnetic valve of the ventilation pipe is opened, and the air circulates in the sealed cabinet body, the first air control chamber and the second air control chamber.

[0024] Secondly, the air mixes with the water mist and warms up in the process of flowing through the first air control chamber, and the mixed air enters the sealed cabinet body after passing through the drying filter plate of the first air control chamber; when the drying filter plate of the first air control chamber is saturated with water, the upper ultrasonic atomizing piece of the first air control chamber stops, and the fan reverses; the upper ultrasonic atomizing piece of the second air control chamber starts, and the fan rotates forward; the air flows reversely, and the air mixes with the water mist and warms up in the process of flowing through the second air control chamber. The mixed air enters the sealed cabinet body after passing through the drying filter plate of the second air control chamber, and the dry air passes through the drying filter plate of the second air control chamber, and the drying filter plate gradually recovers the water absorption capacity; when the drying filter plate of the second air control chamber is saturated with water, the upper ultrasonic atomizing piece of the second air control chamber stops, and the fan rotates forward; the upper ultrasonic atomizing piece of the first air control chamber starts, and the fan reverses; the air flows forward, and the air mixes with the water mist and warms up in the process of flowing through the first air control chamber. The mixed air enters the sealed cabinet body after passing through the drying filter plate of the first air control chamber, and the dry air passes through the drying filter plate of the second air control chamber, and the drying filter plate gradually recovers the water absorption capacity;

[0025] Finally, the above steps are repeated until the temperature inside the sealed cabinet body is not lower than the optimal working temperature of the electronic control unit.

[0026] The application also provides a cleaning method of the alternating current low-voltage switch cabinet, based on the alternating current low-voltage switch cabinet, each water trap is provided with a turbidity meter and a drain pipe, dust in the air is mixed with air and water mist, the water mist passes through the dust blocking net, and more and more small water droplets are gathered on the dust blocking net, and the water droplets containing dust continuously drip to the water trap under the action of gravity, and when the turbidity value of water in a certain water trap is greater than a set value, the specific cleaning steps are as follows: firstly, the water pump of the circulating pipeline is stopped, water circulation is stopped, the drain pipe is opened, and water in the water trap is sucked and discharged, and most of the dust mixed in the water is directly discharged. After the sewage is discharged, the telescopic shafts of the two telescopic motors are retracted, the blocking blocks are withdrawn from the corresponding openings along the transverse sliding grooves, and the two openings are opened. Then, the two drive rollers are synchronously forward rotated, and a section of dust-sticking cloth with dust adhered is wound on the right drive roller. The corresponding telescopic motor of the right drive roller drives the corresponding blocking block to the opening, and a gap is left between the opening and the blocking block, and the gap width is not greater than the thickness of the dust-sticking cloth. The two drive rollers are synchronously reversely rotated, and part of the dust on the dust-sticking cloth is scraped off by the gap width, compared with the existing forward and reverse blowing dust removal, the direct scraping force is large, and the dust-sticking cloth is particularly suitable for stubborn dirt such as oil dirt particles, and the dust removal effect is more thorough. Until the section of dust-sticking cloth with dust adhered is wound on the left drive roller, the telescopic motor corresponding to the right drive roller drives the blocking block to retract. Then, the telescopic motor corresponding to the left drive roller drives the corresponding blocking block to the opening, and a gap is left between the opening and the blocking block, and the gap width is not greater than the thickness of the dust-sticking cloth. The two drive rollers are synchronously forward rotated, and part of the dust on the dust-sticking cloth is scraped off, until the section of dust-sticking cloth with dust adhered is wound on the right drive roller, and the telescopic motor corresponding to the left drive roller drives the blocking block to retract. The forward and reverse dust scraping steps are repeated, and the dust on the dust-sticking cloth cannot be completely removed at a time, and the cleaning can be repeated for multiple times, until the dust on the dust-sticking cloth is completely scraped off, the dust-sticking cloth is reset, the telescopic shafts of the two telescopic motors are extended, the blocking blocks block the corresponding openings along the transverse sliding grooves, the cleaning is completed, the water pump of the circulating pipeline is started, and water circulation is restored. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only show some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0028] Figure 1 It is a perspective view of the alternating current low-voltage switch cabinet hidden behind the rear wall in the present application;

[0029] Figure 2 It is a perspective view of the alternating current low-voltage switch cabinet in the present application;

[0030] Figure 3 is a cross-sectional view of the AC low-voltage switch cabinet in the present application;

[0031] Figure 4 is a perspective view of Figure 3

[0032] Figure 5 is a perspective view of the AC low-voltage switch cabinet in the present application after hiding the electric control unit and part of the sealed cabinet body;

[0033] Figure 6 is a structural schematic view of a single air control chamber in the present application;

[0034] Figure 7 is a cross-sectional view of Figure 6 in the A-A direction;

[0035] Figure 8 is a cross-sectional view of Figure 6 in the B-B direction;

[0036] Figure 9 is a perspective view of Figure 6

[0037] The figure marks: sealed cabinet body 1, water storage pool 2, water pump 3, electric control unit 4, air control chamber 5, air duct 6, fan 7, upper ultrasonic atomization sheet 8, lower ultrasonic atomization sheet 9, water trap 10, dry filter plate 11, ventilation pipe 12, electromagnetic valve 13, water inlet pipe 14, water return pipe 15, electric heating wire 16, drain pipe 17, driving roller 18, telescopic motor 19, dust blocking net 20, dust sticking cloth 21, guide roller 22, opening 23, plugging block 24, transverse sliding groove 25, dust collecting box 26. DETAILED DESCRIPTION

[0038] In view of the deficiencies in the prior art, the present inventors have long-term research and a large number of practices, and have come up with the technical solution of the present application. The technical solution, its implementation process and principles will be further explained in the following in combination with the drawings in the embodiments of the present application and specific implementation cases.

[0039] Example 1:

[0040] As Figure 1 and Figure 2 ​​As shown, the embodiment one provides an alternating current low-voltage switch cabinet, including a sealed cabinet body 1 installed on the ground and a water storage tank 2 installed underground. The side wall of the water storage tank 2 is made of stainless steel, and the water storage tank 2 is provided with a water pump 3 in communication with the corresponding circulating pipeline. Stainless steel has good heat conductivity and strong corrosion resistance. The water storage tank 2 is buried underground 5-10 meters, and the water storage tank 2 with fast heat conduction is beneficial to heat exchange between water and underground soil. An electric control unit 4 is installed in the sealed cabinet body 1. The electric control unit 4 is provided with at least an even number of air control chambers 5 in the space between the electric control unit 4 and the rear wall of the sealed cabinet body 1. In this embodiment, six air control chambers 5 are taken as an example. All the air control chambers 5 have the same structure, and all the air control chambers 5 are arranged in a linear type along the length direction of the sealed cabinet body 1 at the rear of the sealed cabinet body 1.

[0041] The specific structure of each air control chamber 5 is as follows:

[0042] As Figure 3 , Figure 4 and Figure 5As shown, the shape of the air duct 6 inside each air control chamber 5 is U-shaped, and a water trap 10 is formed at the bottom of each air duct 6. The cross-sectional shape of the air duct 6 is rectangular, one end of the air duct 6 is provided with two air fans 7 and faces the electric control unit 4, the other end of the air duct 6 extends downward to the middle of the rear wall, and the air outlet of the air duct 6 is exposed to the sealed cabinet 1. An upper ultrasonic atomizing sheet 8 and a lower ultrasonic atomizing sheet 9 are arranged at the bottom of each air duct 6, the upper ultrasonic atomizing sheet 8 is higher than the corresponding water trap 10, and the lower ultrasonic atomizing sheet 9 is located in the water trap 10. When the water level of the water trap 10 is higher than the entire water trap 10, the water trap 10 is sealed by water, so that the air control chamber 5 is blocked from the outside. In addition, three reusable drying filter plates 11 are arranged in each air duct 6, and the drying agent filled in the drying filter plate 11 can be montmorillonite drying agent, which has the characteristics of fast adsorption speed and large adsorption capacity. The montmorillonite drying agent can be dried at a lower temperature (such as 60-80℃), and the adsorbed water can be removed, so that the drying agent can be reused. The drying agent filled in the drying filter plate 11 can also be active alumina drying agent, which has a large specific surface area and strong adsorption performance, and can adsorb water by physical adsorption. The alumina drying agent can be regenerated by blowing dry air, so that the water in the drying agent is carried out, thereby restoring its drying capacity, and avoiding high-temperature reduction treatment. In addition, activated carbon drying agent also adsorbs water in air by physical adsorption, and can also be restored by blowing dry air. The specific drying agent to be used is determined according to the specific situation, and the present embodiment is not limited. The drying filter plate 11 is located above the corresponding ultrasonic atomizing sheet, and an electric heating wire 16 is arranged above each drying filter plate 11 in each air duct 6. The drying filter plate 11 intercepts the water in the air to prevent excessive humidity from entering the inside of the sealed cabinet 1. The electric heating wire 16 can be started and stopped according to the temperature requirement to reduce energy consumption. In addition, each adjacent two air control chambers 5 are connected by a ventilation pipe 12, the ventilation pipe 12 is located between the drying filter plate 11 and the corresponding upper ultrasonic atomizing sheet 8, and the ventilation pipe 12 is provided with a solenoid valve 13. In the internal circulation mode, the solenoid valve 13 is opened to realize the flow of air in the sealed cabinet 1.

[0043] In the present embodiment, the water below or above the temperature of the sealed cabinet 1 is atomized by the ultrasonic atomizing sheet, and then mixed with air, which has a much higher effect on air cooling or heating than using a heat exchanger. If the heat exchange device such as heat exchange sheet or heat exchange pipe is connected with the circulating pipeline of the present embodiment, the air temperature is indirectly increased or decreased by using such heat exchange device, on the one hand, the effect of cooling or heating is not as good as the ultrasonic atomizing sheet in the present embodiment, on the other hand, the flow channel diameter inside the heat exchange sheet, heat exchange pipe and other heat exchange devices is small, the flow resistance is large, the power of the water pump 3 needs to be increased, and the energy consumption is increased accordingly, which cannot further reduce the energy consumption of the heat dissipation process or the energy consumption of the heating process.

[0044] The principle of repeated use of the drying filter plate 11 in this embodiment is the same as that of the existing rotary dehumidifier, which switches between moisture absorption and regeneration, regenerates by using the heat discharged from the sealed cabinet 1, avoids direct heat discharge and causes heat waste, so as to achieve the effect of energy saving and emission reduction.

[0045] As shown in Figure 1 The embodiment also includes a control unit and a temperature and humidity sensor installed in the sealed cabinet 1, a liquid level sensor installed at each water trap 10, a drain pipe, a turbidity meter, and a solenoid valve 13 installed in the circulating pipeline. The drain pipe 17 is connected to an external suction system for quickly pumping out sewage in the water trap 10.

[0046] The water in the water storage tank 2 in this embodiment is circulated between each water trap 10 and the water storage tank 2 through the circulating pipeline, that is, all water traps 10 share the water in the water storage tank 2. In addition, a filter screen is provided at the interface between each water trap 10 and the circulating pipeline, which can prevent dust from flowing back to the water storage tank 2. The circulating pipeline includes a water inlet pipe 14 and a water return pipe 15, and the water pump 3 is connected to the lower end of the water inlet pipe 14. The upper end of the water inlet pipe 14 is connected to the corresponding water trap 10, and the water return pipe 15 extends downward from the water trap 10 to the water storage tank 2. The solenoid valve 13 of the circulating pipeline is installed in the water return pipe 15. The water level in the water trap 10 is controlled by the on-off of the solenoid valve 13 of the water return pipe 15 and the start-stop of the water pump 3. The input end of the control unit is electrically connected to the temperature and humidity sensor, all liquid level sensors and all turbidity meters, and the output end is electrically connected to all water pumps 3, all electric heating wires 16, all upper ultrasonic atomizing sheets 8, all lower ultrasonic atomizing sheets 9, all fans 7, all driving rollers 18 and all telescopic motors 19. The control unit, temperature and humidity sensor and liquid level sensor are not shown in the figure. The storage unit of the control unit stores an automatic temperature control program, which can automatically start and stop each component according to the temperature and humidity in the sealed cabinet 1.

[0047] Each air duct 6 in the embodiment is provided with a transverse dust screen 20 between the upper ultrasonic atomizing sheet 8 and the drying filter plate 11. The dust screen 20 can intercept most of the water mist, prolong the effective water absorption time of the drying filter plate 11, and also intercept dust. When the water in the water storage bend 10 is turbid, part of the dust in the water will adhere to the side wall of the water storage bend 10. In order to clean the dust, a dust sticking cloth 21 is covered on the inner surface of the side wall of each water storage bend 10. The cross-sectional shape of the water storage bend 10 is rectangular, and a guide roller 22 is arranged at each corner. The dust sticking cloth 21 is wound from the outside of the guide roller 22 in sequence, so that the dust sticking cloth 21 is attached to the side wall. Two drive cylinders 18 are arranged outside the side wall of the water storage bend 10. The side wall of the water storage bend 10 is provided with an opening 23 corresponding to each drive cylinder 18. The two ends of the dust sticking cloth 21 respectively extend from the two openings 23 and are wound on the two drive cylinders 18 in correspondence. In addition, each opening 23 is provided with a corresponding sealing block 24. The outer surface of the side wall of each water storage bend 10 is provided with a transverse sliding groove 25 corresponding to each sealing block 24. A telescopic motor 19 connected with the sealing block 24 is arranged in the transverse sliding groove 25. The sealing block 24 is pushed to slide along the transverse sliding groove 25 to the corresponding opening 23 by the telescopic motor 19. The telescopic shaft of the telescopic motor 19 is extended to push the sealing block 24 to the corresponding opening 23 along the transverse sliding groove 25, so as to block the opening 23. Conversely, the telescopic shaft of the telescopic motor 19 is retracted to pull the sealing block 24 along the transverse sliding groove 25, so that the sealing block 24 exits from the corresponding opening 23, thereby opening the corresponding opening 23.

[0048] Embodiment two:

[0049] Embodiment two provides a control method of an alternating current low-voltage switch cabinet. Based on the alternating current low-voltage switch cabinet of embodiment one, the control method of the embodiment is used for heat dissipation control. The control wind chamber 5 is at least two, and can also be four, six, eight, etc. The embodiment is not limited. Two control wind chambers 5 form a group. The more the number of control wind chambers 5, the stronger the heat dissipation capacity.

[0050] Taking a group of control wind chambers 5 as an example: one of the control wind chambers 5 is the first control wind chamber 5, and the other control wind chamber 5 is the second control wind chamber 5. When the temperature inside the sealed cabinet body 1 is higher than the best working temperature of the electric control unit 4, for example in summer, the heat of the electric control unit 4 needs to be discharged from the sealed cabinet body 1.

[0051] Firstly, under the control of the control unit, the first air control chamber 5 corresponding water pump 3 to the first air control chamber 5 water storage bend 10 injection of an appropriate amount of water, water level with the first air control chamber 5 lower ultrasonic atomizing piece 9 flush, and water in the water storage bend 10 and water storage pool 2 circulation flow. Here through the liquid level sensor feedback real-time water level, through the electromagnetic valve 13 opening degree of backwater pipe 15 and the power of water pump 3 to achieve water circulation, but the liquid level remains unchanged. Lower ultrasonic atomizing piece 9 start to spray water mist, fan 7 start and positive rotation, external air into the first air control chamber 5 air duct 6 and water mist mixed after cooling, and then through the drying filter plate 11, into the sealed cabinet 1. The second air control chamber 5 fan 7 start and reverse, the heat inside the sealed cabinet 1 with air through the drying filter plate 11 in the second air control chamber 5 air duct 6 after discharge.

[0052] Through the temperature and humidity sensor feedback sealed cabinet 1 inside temperature and humidity data, when the first air control chamber 5 drying filter plate 11 saturated after absorbing water, the control unit makes the first air control chamber 5 corresponding water pump 3 to the first air control chamber 5 water storage bend 10 in all discharge into the water storage pool 2, lower ultrasonic atomizing piece 9 stop, the first air control chamber 5 fan 7 reverse sealed cabinet 1 heat with air through the drying filter plate 11 in the first air control chamber 5 air duct 6 after discharge, drying filter plate 11 heat and gradually restore the ability to absorb water, if the heat inside the sealed cabinet 1 is not enough to dry the drying filter plate 11, the first air control chamber 5 electric heating wire 16 start to warm up, until the drying filter plate 11 restore the ability to absorb water. The second air control chamber 5 corresponding water pump 3 to the second air control chamber 5 water storage bend 10 injection of an appropriate amount of water, water level with the second air control chamber 5 lower ultrasonic atomizing piece 9 flush, and water in the water storage bend 10 and water storage pool 2 circulation flow; The second air control chamber 5 fan 7 positive rotation, external air into the second air control chamber 5 air duct 6 and water mist mixed after cooling, and then through the drying filter plate 11, into the sealed cabinet 1.

[0053] When the drying filter plate 11 of the second air control chamber 5 is saturated with water, the corresponding water pump 3 of the second air control chamber 5 makes all the water in the water storage bend 10 of the first air control chamber 5 flow into the water storage pool 2, the lower ultrasonic atomizing sheet 9 stops, the fan 7 of the second air control chamber 5 reverses, the heat in the sealed cabinet body 1 is discharged after the air passes through the drying filter plate 11 in the air duct 6 of the second air control chamber 5, the drying filter plate 11 is heated and restores the water absorption capacity, if the heat in the sealed cabinet body 1 is not enough to dry the drying filter plate 11, the electric heating wire 16 of the second air control chamber 5 is started to heat up until the drying filter plate 11 restores the water absorption capacity. The corresponding water pump 3 of the first air control chamber 5 injects an appropriate amount of water into the water storage bend 10 of the first air control chamber 5, so that the water level is flush with the lower ultrasonic atomizing sheet 9 of the first air control chamber 5, and the water circulates between the water storage bend 10 and the water storage pool 2; the fan 7 of the first air control chamber 5 rotates forward, the external air enters the air duct 6 of the first air control chamber 5, is mixed with the water mist to reduce the temperature, and then passes through the drying filter plate 11 to enter the sealed cabinet body 1;

[0054] The last control unit repeats the above steps until the internal temperature of the sealed cabinet body 1 is not higher than the optimal working temperature of the electric control unit 4. If there are two or more groups of air control chambers 5, the same steps are taken to improve the heat dissipation power.

[0055] The heat dissipation principle of the embodiment is: the optimal working temperature range of the low-voltage AC switch cabinet is usually 5-35°, because the underground soil layer temperature is relatively constant relative to the ground, and is stable at 15-20℃ in summer, and the temperature relative to the ground is above 40, the low-temperature water mist is used to reduce the inlet air temperature, and the electric control unit 4 is cooled, and the heat is taken out, and the external circulation cooling is realized. Compared with the existing air conditioning system cooling, the water mist cooling method formed by using underground water consumes less electric energy, which is beneficial to the operation and maintenance cost of the outdoor new energy vehicle charging station.

[0056] The drying agent of the drying filter plate 11 in the embodiment is montmorillonite drying agent.

[0057] Embodiment three:

[0058] Embodiment three provides another control method of a low-voltage AC switch cabinet, based on the low-voltage AC switch cabinet of embodiment one, the control method of embodiment three is used for temperature control, and embodiment three and embodiment two are the same, that is, the air control chamber 5 is provided with at least two, and the number of air control chambers 5 is even.

[0059] When the internal temperature of the sealed cabinet body 1 is lower than the optimal working temperature of the electric control unit 4, the steps are as follows:

[0060] Firstly, the control unit makes the water pump 3 corresponding to the first air control chamber 5 injects an appropriate amount of water into the water storage bend 10 of the first air control chamber 5, the water seal stores the water bend 10, the water level is flush with the upper ultrasonic atomizing piece 8 of the first air control chamber 5, and the water circulates between the water storage bend 10 and the water storage pool 2, the upper ultrasonic atomizing piece 8 starts to spray water mist, and the fan 7 starts and rotates in the positive direction. The water pump 3 corresponding to the second air control chamber 5 injects an appropriate amount of water into the water storage bend 10 of the second air control chamber 5, the water seal stores the water bend 10, the water level is flush with the upper ultrasonic atomizing piece 8 of the second air control chamber 5, and the water circulates between the water storage bend 10 and the water storage pool 2, the fan 7 starts and rotates in the reverse direction. Here, the water level is obtained in real time according to the liquid level sensor, and the water circulation is realized by the opening degree of the electromagnetic valve 13 of the backwater pipe 15 and the power of the water pump 3. The control unit opens the electromagnetic valve 13 of the ventilation pipe 12, and the air circulates in the sealed cabinet body 1, the first air control chamber 5 and the second air control chamber 5.

[0061] Secondly, the air mixes with the water mist and is heated during the process of flowing through the first air control chamber 5, and the mixed air enters the sealed cabinet body 1 after passing through the drying filter plate 11 of the first air control chamber 5. When the drying filter plate 11 of the first air control chamber 5 is saturated with water, the control unit stops the upper ultrasonic atomizing piece 8 of the first air control chamber 5, the fan 7 reverses, the upper ultrasonic atomizing piece 8 of the second air control chamber 5 starts, and the fan 7 rotates in the positive direction; the air flows in the reverse direction, the air mixes with the water mist and is heated during the process of flowing through the second air control chamber 5, and the mixed air enters the sealed cabinet body 1 after passing through the drying filter plate 11 of the second air control chamber 5, and the drying air passes through the drying filter plate 11 of the second air control chamber 5, and the drying filter plate 11 gradually recovers the water absorption capacity; when the drying filter plate 11 of the second air control chamber 5 is saturated with water, the upper ultrasonic atomizing piece 8 of the second air control chamber 5 stops, the fan 7 rotates in the positive direction; the upper ultrasonic atomizing piece 8 of the first air control chamber 5 starts, and the fan 7 reverses; the air flows in the positive direction, the air mixes with the water mist and is heated during the process of flowing through the first air control chamber 5, and the mixed air enters the sealed cabinet body 1 after passing through the drying filter plate 11 of the first air control chamber 5, and the drying air passes through the drying filter plate 11 of the second air control chamber 5, and the drying filter plate 11 gradually recovers the water absorption capacity;

[0062] Finally, the above steps are repeated until the temperature inside the sealed cabinet body 1 is not lower than the optimal working temperature of the electric control unit 4.

[0063] The principle of increasing the temperature inside the sealed cabinet body 1 in the embodiment is that the temperature of the underground 5-10 soil layer is usually 5-10℃ in winter. The temperature is relatively high compared with the ground zero, and the water temperature is used to heat the internal circulating air to keep the temperature inside the sealed cabinet body 1 not lower than 5°, so that the electric control unit 4 is kept in the optimal working state, and the energy consumption is lower compared with the existing electric auxiliary heating device, and the natural resources are fully utilized.

[0064] The drying agent of the drying filter plate 11 in the embodiment is active alumina or active carbon drying agent.

[0065] It should be understood that the above-mentioned embodiments only serve the purpose of illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it. It cannot be considered that the specific implementation of the present application is limited to these descriptions. For ordinary skilled in the art to which the present application belongs, without departing from the concept of the present application, some simple deductions or substitutions can be made. Any equivalent changes or modifications made in accordance with the spirit and essence of the present application should be covered within the protection scope of the present application.

[0066] Example Four:

[0067] The embodiment four provides a cleaning method of an alternating current low-voltage switch cabinet, which is applied to the alternating current low-voltage switch cabinet of the embodiment one. Dust in the air is mixed with air and water mist, the water mist passes through the dust blocking net 20, and more and more small water drops are gathered on the dust blocking net 20. Under the action of gravity, the water drops with dust are continuously dropped to the water storage bend 10. When the turbidity value of the water in a certain water storage bend 10 is greater than a set value, the specific cleaning steps are as follows: firstly, the water pump 3 of the circulating pipeline is stopped, the water circulation is stopped, the drain pipe 17 is opened, and the water in the water storage bend 10 is sucked and discharged, so that most of the dust mixed in the water is directly discharged. When the sewage is discharged, the telescopic shafts of the two telescopic motors 19 are retracted, the blocking blocks 24 are withdrawn from the corresponding openings 23 along the transverse sliding grooves 25, and the two openings 23 are opened. Then, the two drive rollers 18 are synchronously and positively rotated, so that the dust-sticking cloth 21 with dust is wound on the right drive roller 18. The corresponding telescopic motor 19 of the right drive roller 18 pushes the corresponding blocking block 24 to the opening 23, and a gap is left between the opening 23 and the blocking block 24, and the gap width is not greater than the thickness of the dust-sticking cloth 21. The two drive rollers 18 are synchronously and reversely rotated, and part of the dust on the dust-sticking cloth 21 is scraped off by the gap width. Compared with the existing positive and reverse blowing dust cleaning, the scraping force is large, and the dust cleaning effect is more thorough. In order to collect the scraped dust, the dust collecting box 26 is arranged below the opening 23, and the scraped dust falls into the dust collecting box 26, so that the dust can be conveniently collected and treated. Until the dust-sticking cloth 21 with dust is wound on the left drive roller 18, the corresponding telescopic motor 19 drives the blocking block 24 to retract. Then, the corresponding telescopic motor 19 of the left drive roller 18 pushes the corresponding blocking block 24 to the opening 23, and a gap is left between the opening 23 and the blocking block 24, and the gap width is not greater than the thickness of the dust-sticking cloth 21. The two drive rollers 18 are synchronously and positively rotated, so that part of the dust on the dust-sticking cloth 21 is scraped off. Until the dust-sticking cloth 21 with dust is wound on the right drive roller 18, the corresponding telescopic motor 19 drives the blocking block 24 to retract. The positive and reverse dust scraping steps are repeated, the dust on the dust-sticking cloth 21 cannot be completely removed at a time, and the cleaning can be repeated for multiple times until the dust on the dust-sticking cloth 21 is completely scraped off. The dust-sticking cloth 21 is reset, the telescopic shafts of the two telescopic motors 19 are extended, the blocking blocks 24 block the corresponding openings 23 along the transverse sliding grooves 25, the cleaning is completed, the water pump 3 of the circulating pipeline is started, and the water circulation is restored.

Claims

1. A low-voltage AC switchgear, characterized in that: The system includes a sealed cabinet installed on the ground and an electrical control unit installed inside the sealed cabinet. At least two air control chambers are provided in the space between the electrical control unit and the rear wall of the sealed cabinet. All air control chambers have the same structure, and the air duct inside each air control chamber is U-shaped, thus forming a water trap at the bottom of each air duct. One end of the air duct is equipped with a fan facing the electrical control unit, and the other end of the air duct extends downwards to the middle of the rear wall, with the air outlet of the air duct exposed outside the sealed cabinet. Each air duct has an upper ultrasonic atomizing plate and a lower ultrasonic atomizing plate at its bottom. The upper ultrasonic atomizing plate is higher than the corresponding water trap, and the lower ultrasonic atomizing plate is located within the water trap. Each air duct is equipped with a reusable drying filter plate, which is located above the corresponding ultrasonic atomizing plate. Each air duct is also equipped with a transverse dust trap, which is located between the upper ultrasonic atomizing plate and the drying filter plate. The inner surface of the side wall of each water trap is covered with a layer of adhesive cloth, and the outer side wall is equipped with two drive rollers. The side wall of the water trap has openings that correspond one-to-one with the two drive rollers. The two ends of the adhesive cloth extend from the two openings and are wrapped around the two drive rollers one-to-one. Each opening is equipped with a suitable sealing block. It includes an underground water storage tank, in which water circulates between each water trap and the water storage tank through a circulation pipe; each water trap and the circulation pipe interface is equipped with a filter screen.

2. The AC low-voltage switchgear according to claim 1, characterized in that: Each water trap sidewall has a transverse sliding groove on its outer surface that corresponds to each sealing block. The transverse sliding groove is equipped with a telescopic motor connected to the sealing block. The telescopic motor pushes the sealing block to slide along the transverse sliding groove to the corresponding opening.

3. The AC low-voltage switchgear according to claim 2, characterized in that: Each pair of adjacent air control chambers is connected by a ventilation duct, which is located between the drying filter plate and the corresponding upper ultrasonic atomizing plate, and the ventilation duct is equipped with a solenoid valve.

4. The AC low-voltage switchgear according to claim 3, characterized in that: The side walls of the water storage tank are made of stainless steel, and a water pump connected to the corresponding circulation pipeline is installed inside the water storage tank.

5. The AC low-voltage switchgear according to claim 4, characterized in that: Each air duct is equipped with an electric heating wire located above the corresponding drying filter plate.

6. A control method for an AC low-voltage switchgear, characterized in that: Based on the AC low-voltage switchgear according to claim 5, there are two air control chambers, one of which is the first air control chamber and the other is the second air control chamber. When the internal temperature of the sealed cabinet is higher than the optimal operating temperature of the electrical control unit, the steps are as follows: S1. The water pump corresponding to the first air control chamber injects an appropriate amount of water into the water trap of the first air control chamber, so that the water level is level with the lower ultrasonic atomizing plate of the first air control chamber, and the water circulates between the water trap and the water tank; the lower ultrasonic atomizing plate is activated to spray water mist, the fan is activated and rotates forward, the outside air enters the air duct of the first air control chamber and mixes with the water mist, then cools down, and then passes through the drying filter plate and enters the sealed cabinet. S2. The fan in the second air control chamber starts and reverses, and the heat inside the sealed cabinet is discharged after passing through the drying filter plate in the air duct of the second air control chamber with the air. S3. When the drying filter plate in the first air control chamber is saturated with water; The water pump corresponding to the first air control chamber drains all the water in the water trap of the first air control chamber into the water storage tank. The lower ultrasonic atomizing plate stops, and the fan of the first air control chamber reverses. The heat inside the sealed cabinet is discharged after passing through the drying filter plate in the air duct of the first air control chamber with the air. The drying filter plate is heated and gradually restores its water absorption capacity. If the heat inside the sealed cabinet is insufficient to dry the drying filter plate, the electric heating wire of the first air control chamber is activated to raise the temperature until the drying filter plate restores its water absorption capacity. The water pump corresponding to the second air control chamber injects an appropriate amount of water into the water trap of the second air control chamber, so that the water level is level with the lower ultrasonic atomizing plate of the second air control chamber, and the water circulates between the water trap and the water tank; the fan of the second air control chamber rotates in the forward direction, and the outside air enters the air duct of the second air control chamber and mixes with the water mist before being cooled down, and then passes through the drying filter plate before entering the sealed cabinet. S4. When the drying filter plate in the second air control chamber is saturated with water; The water pump corresponding to the second air control chamber drains all the water in the trap of the first air control chamber into the water storage tank. The ultrasonic atomizing plate stops, the fan in the second air control chamber reverses, and the heat in the sealed cabinet is discharged with the air through the drying filter plate in the air duct of the second air control chamber. The drying filter plate is heated and regains its water absorption capacity. If the heat in the sealed cabinet is insufficient to dry the drying filter plate, the electric heating wire in the second air control chamber is activated to raise the temperature until the drying filter plate regains its water absorption capacity. The water pump corresponding to the first air control chamber injects an appropriate amount of water into the water trap of the first air control chamber, so that the water level is level with the lower ultrasonic atomizing plate of the first air control chamber, and the water circulates between the water trap and the water tank; the fan of the first air control chamber rotates in the forward direction, and the outside air enters the air duct of the first air control chamber and mixes with the water mist before being cooled down, and then passes through the drying filter plate and enters the sealed cabinet. S5. Repeat S3~S4 until the internal temperature of the sealed cabinet is not higher than the optimal operating temperature of the electrical control unit.

7. A control method for an AC low-voltage switchgear, characterized in that: Based on the AC low-voltage switchgear according to claim 5, there are two air control chambers, one of which is the first air control chamber and the other is the second air control chamber. When the internal temperature of the sealed cabinet is lower than the optimal operating temperature of the electrical control unit, the steps are as follows: S1. The water pump corresponding to the first air control chamber injects an appropriate amount of water into the water trap of the first air control chamber, and the water trap is sealed so that the water level is level with the upper ultrasonic atomizing plate of the first air control chamber and the water circulates between the water trap and the water tank. The upper ultrasonic atomizing plate is activated to spray water mist, and the fan is started and rotates in the forward direction. S2. The water pump corresponding to the second air control chamber injects an appropriate amount of water into the water trap of the second air control chamber, and the water trap is sealed so that the water level is flush with the upper ultrasonic atomizing plate of the second air control chamber and the water circulates between the water trap and the water tank. The fan starts and reverses; the solenoid valve of the ventilation pipe opens, and the air circulates in the sealed cabinet, the first air control chamber and the second air control chamber. S3. As air flows through the first air control chamber, it mixes with water mist and heats up. The mixed air then passes through the drying filter plate in the first air control chamber before entering the sealed cabinet. When the drying filter plate in the first air control chamber becomes saturated with water, the upper ultrasonic atomizing plate in the first air control chamber stops, and the fan reverses direction. The upper ultrasonic atomizing plate in the second air control chamber starts, and the fan rotates forward. Air flows in the opposite direction, mixing with water mist and heating up as it flows through the second air control chamber. The mixed air then passes through the drying filter plate in the second air control chamber before entering the sealed cabinet, while the dried air passes through... The air passes through the drying filter plate in the second air control chamber, and the drying filter plate gradually regains its water absorption capacity. When the drying filter plate in the second air control chamber is saturated with water, the upper ultrasonic atomizing plate in the second air control chamber stops, and the fan rotates forward. The upper ultrasonic atomizing plate in the first air control chamber starts, and the fan rotates in reverse. The air flows in the forward direction, and during the process of the air flowing through the first air control chamber, it mixes with the water mist and heats up. The mixed air passes through the drying filter plate in the first air control chamber before entering the sealed cabinet. At the same time, the dry air passes through the drying filter plate in the second air control chamber, and the drying filter plate gradually regains its water absorption capacity. S4. Repeat S3 until the internal temperature of the sealed cabinet is not lower than the optimal operating temperature of the electrical control unit.

8. A cleaning method for a low-voltage AC switchgear, characterized in that: Based on the AC low-voltage switchgear described in claim 5, each water trap is equipped with a turbidity meter and a drain pipe. Dust in the air mixes with water mist, and as the water mist passes through the dust filter, more and more small water droplets accumulate on the filter. Under the action of gravity, water droplets mixed with dust continuously drip into the water trap. When the turbidity value of the water in a certain water trap exceeds a set value, the cleaning steps are as follows: S1. The water pump in the circulating pipeline stops, stopping water circulation; S2. The drain pipe is opened, and the water in the trap is pumped out. S3, the telescopic shafts of the two telescopic motors retract, and the sealing block exits from the corresponding opening along the transverse slide; S4. The two drive rollers rotate synchronously in the forward direction, causing a section of sticky cloth with dust to wrap around the right drive roller. S5. The telescopic motor corresponding to the right drive roller pushes the corresponding sealing block to the opening, and there is a gap between the opening and the sealing block, the width of which is no greater than the thickness of the dust-adhesive cloth. S6. The two drive rollers rotate in reverse synchronously, and some of the dust on the adhesive cloth is scraped off until the section of the adhesive cloth with dust is wrapped around the left drive roller. The telescopic motor corresponding to the right drive roller drives the sealing block to retract. S7. The telescopic motor corresponding to the left drive roller pushes the corresponding sealing block to the opening, and there is a gap between the opening and the sealing block, the width of which is no greater than the thickness of the dust-adhesive cloth. S8. The two drive rollers rotate synchronously in the forward direction, and some of the dust on the sticky cloth is scraped off until the section of sticky cloth with dust is wrapped around the right drive roller. The telescopic motor corresponding to the left drive roller drives the sealing block to retract. S9. Repeat S5-S8 until all the dust on the adhesive cloth is scraped off. The adhesive cloth is reset, the telescopic shafts of the two telescopic motors extend, and the sealing block blocks the corresponding opening along the transverse slide. The cleaning is complete, the water pump in the circulation pipe is turned on, and water circulation is restored.

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