Steam recovery device of industrial cooling tower

Abstract

The utility model relates to the technical field of steam recovery, in particular to a steam recovery device of an industrial cooling tower, which can recover residual heat in steam, reduce heat waste, improve the steam recovery effect and reduce water resource waste. Comprising a shell, a heat recovery assembly, a condensation assembly, a recovery filtering assembly and an air exhaust assembly, the heat recovery assembly is installed at the lower end in the shell, the condensation assembly is installed in the shell and located above the heat recovery assembly, the input end of the recovery filtering assembly is installed on the inner wall of the shell, and the air exhaust assembly is installed at the top end of the shell.

Description

Technical Field

[0001] This utility model relates to the technical field of steam recovery, and in particular to a steam recovery device for industrial cooling towers. Background Technology

[0002] A cooling tower is a device that uses water as a circulating coolant to absorb heat from a system and release it into the atmosphere to lower the water temperature. Its principle is based on the heat exchange between water and airflow, which generates steam. The steam evaporates, carrying away heat through evaporation, convection, and radiation, thus dissipating waste heat generated in industrial processes or refrigeration and air conditioning systems to lower the water temperature. However, a large amount of water in the cooling tower is released into the air and cannot be recovered, and evaporation carries away a significant amount of heat, resulting in energy waste. The prior art publication number CN203657540U discloses a cooling tower capable of recovering evaporated water. It features a cooling tower cylinder with a fan at the top. A humidified heat chamber for introducing humid air is installed at the top of the cooling tower cylinder, formed by an inner sealing plate and an inner ring plate, communicating with the cooling tower cylinder. An upper ring plate is located above the inner sealing plate, and a lower ring plate is located below the inner ring plate, forming a cold air chamber for introducing cold air. Air mixing chambers are installed on the left and right sides of the cold air chamber, communicating with both the humidified heat chamber and the cold air chamber. Dry, cold air mixes with the humidified heat air to form mixed air. Water vapor in the mixed air is condensed and collected by a water collector into a water collection tank. Therefore, the evaporated water in the humidified heat air exiting the tower is effectively collected, resulting in mixed air with a low water vapor content. However, it is not very effective at absorbing water vapor in cold, humid air, resulting in a large amount of water vapor being released into the air, polluting the environment, wasting water resources, and increasing the amount of water needed for replenishment. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides an industrial cooling tower steam recovery device that can recover the residual heat in water vapor, reduce heat waste, improve the water vapor recovery effect, and reduce water resource waste.

[0004] This utility model discloses an industrial cooling tower steam recovery device, comprising a shell, a heat recovery component, a condensation component, a recovery filter component, and an extraction component. The heat recovery component is installed at the lower end of the shell, the condensation component is installed inside the shell and above the heat recovery component, the input end of the recovery filter component is installed on the inner wall of the shell, and the extraction component is installed at the top of the shell. The extraction component extracts air from the shell, increasing the flow rate of water vapor inside the shell. The water vapor enters through the bottom of the shell, and the heat recovery component recovers the remaining heat in the water vapor. The temperature of the high-temperature water vapor drops rapidly, and the theoretical water content of the water vapor also decreases as the temperature decreases, turning saturated water vapor into supersaturated water vapor, which is more conducive to water recovery. The condensation component condenses and recovers the water vapor, and the recovery filter component can recover the condensed water and filter out impurities in the water while recovering the water, improving its practicality.

[0005] Preferably, the heat recovery assembly includes a heat recovery box, multiple spiral heat exchange tubes, an inlet pipe, and a hot water pipe. The heat recovery box is fixedly installed on the lower inner wall of the shell. Multiple spiral heat exchange tubes are installed inside the heat recovery box. The inlet end of the spiral heat exchange tubes is connected to the lower part of the shell, and the outlet end of the spiral heat exchange tubes is connected to the upper part of the shell. The inlet end of the heat recovery box is connected to the inlet pipe, which extends to the outside of the shell. The upper outlet end of the heat recovery box is connected to the hot water pipe, which extends to the outside of the shell, and each hot water pipe is equipped with a temperature control valve. Water vapor enters the shell and then flows into the spiral heat exchange tubes. Water is introduced into the heat recovery box through the inlet pipe. The heat in the water vapor is transferred into the water in the heat recovery box through the spiral heat exchange tubes, causing the temperature of the high-temperature water vapor to drop rapidly. After the temperature drops, the theoretical water content of the water vapor also decreases, and the saturated water vapor becomes supersaturated water vapor, which is more conducive to water recovery. After the water temperature in the heat recovery box rises, it is discharged through the hot water pipe to recover the remaining heat in the water vapor and reduce heat waste.

[0006] Preferably, the condensation assembly includes a water tank, a condenser shroud, multiple condenser strips, a condensate pipe, a water pump, and a return pipe. The water tank is fixedly installed on the lower outer wall of the housing, and the condenser shroud is installed on the upper inner wall of the housing. The condenser shroud is hollow and conical. Multiple condenser strips are installed on the bottom side wall of the condenser shroud. The inlet end of the condenser shroud is connected to the condensate pipe, and the inlet end of the condensate pipe is connected to the outlet end of the water pump. The water pump is installed on the top of the water tank, and the inlet end of the water pump is located inside the water tank. The outlet end of the condenser shroud is connected to the return pipe, and the outlet end of the return pipe is connected to the inside of the water tank. The water pump is started to draw cooling water from the water tank and input it into the condenser shroud through the condensate pipe. The return pipe ensures that the water in the condenser shroud is always kept at a low temperature. Water vapor comes into contact with the lower low-temperature side wall of the condenser shroud and condenses rapidly on the side wall. Then, the condensate flows towards the housing along the inclined side wall under the action of gravity. The condenser strips increase the contact area of ​​the water vapor and guide the water vapor.

[0007] Preferably, the system also includes two support rods, a guide block, a connecting pipe, and multiple heat dissipation fins. The top left and right sides of the guide block are mounted on the bottom sidewall of the condenser shroud via the support rods. The lower part of the guide block is conical, and the upper part is frustum-shaped. A cooling chamber is formed inside the frustum-shaped chamber, which is connected to two connecting pipes. The front connecting pipe is connected to the inside of the condenser shroud, and the output end of the rear connecting pipe is connected to the return water pipe. Multiple heat dissipation fins are evenly installed on the sidewall of the water tank, and multiple heat dissipation holes are formed at the outer ends of the heat dissipation fins. When the water vapor moves upward, it is guided by the conical shape at the bottom of the guide block, causing the water vapor to flow towards the condenser shroud. A portion of the condensate in the condenser shroud is input into the cooling chamber through the connecting pipe. When the water vapor passes above the guide block, it can be condensed, improving the condensation effect. The heat dissipation fins can increase the heat dissipation effect of the water inside the water tank, ensuring that the water is always kept at a low temperature.

[0008] Preferably, the recycling filter assembly includes a collection ring, a collection pipe, a filter box, two insert plates, a filter element, two limiting blocks, and a sealing cover. The collection ring is installed on the inner wall of the housing and located below the guide block. The collection pipe is installed on the side wall of the housing, with its inlet end above the collection ring and its outlet end connected to the filter box. The outlet end of the filter box communicates with the inside of the water tank. Insert plates are installed on the front and rear side walls of the filter box, and limiting grooves are formed inside the insert plates. The filter element is located inside the filter box, and limiting blocks are installed at both the front and rear ends of the filter element. The filter element has a slidable limit block installed in the limit groove. A sealing cover is installed on the left side wall of the filter element, and the sealing cover is bolted to the left side wall of the filter box. The condensate flowing down the outer wall of the condenser cover and guide block is collected by the collection ring and flows into the collection pipe. The filter element filters impurities, allowing the water to be recycled. Unscrewing the bolts and pulling the sealing cover moves the filter element out of the filter box for replacement and cleaning, ensuring filtration efficiency. The limit block and the plate work together to ensure the seal between the filter element and the filter box.

[0009] Preferably, the air extraction assembly includes an air outlet hood, an air blower, an air pipe, and multiple air outlets. The air outlet hood is installed on the top of the housing, and an air blowing chamber is opened in the upper part of the air outlet hood. Multiple air outlets are evenly installed on the inner wall of the air outlet hood, and the input end of the air outlet is connected to the inside of the air blowing chamber. The output end of the air outlet is inclined upward. The air blower is installed on the outer wall of the housing, and the output end of the air blower is connected to the air pipe. The output end of the air pipe is connected to the air blowing chamber. When the air blower is started, air is blown into the air blowing chamber through the air pipe and blown out to the top of the air outlet hood through the air outlets, thereby reducing the pressure at the top output end of the air outlet hood and increasing the flow velocity of water vapor inside the housing.

[0010] Preferably, the device also includes a water supply pipe, a baffle plate, a drain pipe, and a humidity sensor. The water supply pipe is connected to the upper part of the water tank, the baffle plate is installed on the inner wall of the water tank, and the drain pipe is connected to the lower part of the outer wall of the water tank. A valve is installed on the drain pipe, and the humidity sensor is installed on the lower inner wall of the housing. The humidity sensor is connected to the controller and monitors the moisture content in the water vapor inside the housing in real time and sends the data to the server. The server compares the data with preset data to facilitate timely activation of the equipment. The water supply pipe facilitates the replenishment of cooling water into the water tank, and the baffle plate can stratify the interior of the water tank, allowing easily sedimented substances to settle to the bottom of the water tank. After a certain period of time, the sediment can be discharged through the drain pipe.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: the air extraction component extracts air from the inside of the shell, increasing the flow rate of water vapor inside the shell. The water vapor enters through the bottom of the shell, and the heat recovery component recovers the remaining heat in the water vapor. The temperature of the high-temperature water vapor drops rapidly, and the theoretical water content of the water vapor also decreases after the temperature drops, turning saturated water vapor into supersaturated water vapor, which is more conducive to water recovery. The condensation component condenses and recovers the water vapor, and the recovery filtration component can recover the condensed water and filter out impurities in the water while recovering the water, thus improving its practicality. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a three-dimensional structural diagram of the rear of this utility model;

[0014] Figure 3 This is a partial cross-sectional structural schematic diagram of the present invention;

[0015] Figure 4 This is a schematic diagram of the internal structure of this utility model;

[0016] Figure 5 This is a front cross-sectional structural diagram of the present invention;

[0017] Figure 6 This is a schematic diagram of the left-side cross-sectional structure of this utility model;

[0018] The following are labels in the attached diagram: 1. Shell; 2. Heat recovery box; 3. Spiral heat exchange tube; 4. Inlet pipe; 5. Hot water pipe; 6. Water tank; 7. Condensation hood; 8. Condensation bar; 9. Condensate pipe; 10. Water pump; 11. Return pipe; 12. Collection ring; 13. Collection pipe; 14. Support rod; 15. Guide block; 16. Connecting pipe; 17. Heat dissipation fins; 18. Filter box; 19. Insert plate; 20. Filter element; 21. Limiting insert; 22. Sealing cover; 23. Water supply pipe; 24. Partition plate; 25. Discharge pipe; 26. Humidity sensor; 27. Exhaust hood; 28. Air blower; 29. ​​Air pipe; 30. Exhaust head. Detailed Implementation

[0019] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete. Example 1

[0020] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 6 As shown, the heat recovery box 2 is fixedly installed on the lower inner wall of the shell 1. Multiple spiral heat exchange tubes 3 are installed inside the heat recovery box 2. The inlet end of the spiral heat exchange tubes 3 is connected to the lower part of the shell 1, and the outlet end of the spiral heat exchange tubes 3 is connected to the upper part of the shell 1. A water inlet pipe 4 is connected to the inlet end of the heat recovery box 2, extending to the outside of the shell 1. A hot water pipe 5 is connected to the upper outlet end of the heat recovery box 2, extending to the outside of the shell 1. Each hot water pipe 5 is equipped with a temperature control valve. The water tank 6 is fixedly installed on the lower outer wall of the shell 1. A condenser hood 7 is installed on the upper inner wall of the shell 1. The condenser hood 7 is hollow and conical. Multiple condenser strips 8 are installed on the bottom side wall of the condenser hood 7. A condensate water pipe 9 is connected to the inlet end of the condenser hood 7, and the inlet end of the condensate water pipe 9 is connected to the outlet end of the water pump 10. The water pump 10 is installed on the water tank 6. The top of the tank 6, and the input end of the water pump 10 is located inside the tank 6. The output end of the condenser shroud 7 is connected to the return water pipe 11. The output end of the return water pipe 11 is connected to the inside of the tank 6. The collecting ring 12 is installed on the inner wall of the housing 1 and is located below the guide block 15. The collecting pipe 13 is installed on the side wall of the housing 1. The input end of the collecting pipe 13 is located above the collecting ring 12. The output end of the collecting pipe 13 is connected to the filter box 18. The output end of the filter box 18 is connected to the inside of the tank 6. The front and rear side walls of the filter box 18 are equipped with insert plates 19. The insert plates 19 have a limit groove inside. The filter element 20 is located inside the filter box 18. The front and rear ends of the filter element 20 are equipped with limit inserts 21. The limit inserts 21 are slidably installed in the limit groove. The left side wall of the filter element 20 is equipped with a sealing cover plate 22. The sealing cover plate 22 is installed on the left side wall of the filter box 18 by bolts.

[0021] Water vapor enters the shell 1 and flows into the spiral heat exchange tube 3. Water is then introduced into the heat recovery tank 2 through the water inlet pipe 4. The spiral heat exchange tube 3 conducts heat from the water vapor into the water in the heat recovery tank 2, causing the temperature of the high-temperature water vapor to drop rapidly. As the temperature decreases, the theoretical water content of the water vapor also decreases, transforming saturated water vapor into supersaturated water vapor, which is more conducive to water recovery. After the water temperature in the heat recovery tank 2 increases, it is discharged through the hot water pipe 5, recovering the remaining heat in the water vapor and reducing heat waste. The water pump 10 is started to draw cooling water from the water tank 6 and input it into the condenser 7 through the condensate pipe 9. The return water pipe 11 ensures that the condenser 7... The water in the container is always kept at a low temperature. Water vapor comes into contact with the low-temperature side wall of the condenser 7 and condenses rapidly on the side wall. Then, the condensate flows down the inclined side wall to the shell 1 under the action of gravity. The condenser bar 8 can increase the contact area of ​​water vapor and guide the water vapor. The condensate flowing down the outer wall is collected by the collection ring 12 and flows into the collection pipe 13. Impurities are filtered by the filter element 20, so that the water can be recycled. Unscrewing the bolt and pulling the sealing cover 22 will move the filter element 20 out of the filter box 18 for replacement and cleaning, ensuring filtration efficiency. The limit block 21 and the insert plate 19 can ensure the sealing between the filter element 20 and the filter box 18. Example 2

[0022] like Figure 3 , Figure 5 and Figure 6 As shown, based on Embodiment 1, the guide block 15 is mounted on the bottom sidewall of the condenser shroud 7 via support rods 14 on its top left and right sides. The lower part of the guide block 15 is conical, and the upper part is frustum-shaped. A cooling chamber is formed inside the frustum-shaped chamber, which is connected to two connecting pipes 16. The front connecting pipe 16 is connected to the inside of the condenser shroud 7, and the output end of the rear connecting pipe 16 is connected to the return water pipe 11. Multiple heat dissipation fins 17 are evenly installed on the sidewall of the water tank 6, and multiple heat dissipation holes are formed at the outer ends of the heat dissipation fins 17. An exhaust shroud 27 is installed on the top of the housing 1. An air blowing chamber is provided on the upper part of the air outlet hood 27. Multiple air outlets 30 are evenly installed on the inner wall of the air outlet hood 27. The input end of the air outlet 30 is connected to the inside of the air blowing chamber, and the output end of the air outlet 30 is tilted upward. The air blower 28 is installed on the outer wall of the housing 1. The output end of the air blower 28 is connected to the air pipe 29. The output end of the air pipe 29 is connected to the air blowing chamber. The water supply pipe 23 is connected to the upper part of the water tank 6. The partition 24 is installed on the inner wall of the water tank 6. The lower part of the outer wall of the water tank 6 is connected to the discharge pipe 25. A valve is provided on the discharge pipe 25. The humidity sensor 26 is installed on the lower inner wall of the housing 1.

[0023] As water vapor moves upward, it is guided by the cone shape at the bottom of the guide block 15, causing it to flow towards the condenser 7. A portion of the condensate in the condenser 7 is input into the cooling chamber through the connecting pipe 16. As the water vapor passes above the guide block 15, it is condensed, improving the condensation effect. The heat dissipation fins 17 enhance the heat dissipation of the water inside the water tank 6, ensuring the water remains at a low temperature. The air blower 28 blows air into the air blowing chamber through the air pipe 29, and then blows it out through the air outlet 30 towards the top of the air outlet hood 27, reducing... The pressure at the top of the vent 27 increases the flow rate of water vapor inside the housing 1. The humidity sensor 26 is connected to the controller. The humidity sensor 26 monitors the moisture content of water vapor inside the housing 1 in real time and sends the data to the server. The server compares the data with preset data to facilitate timely start-up of the equipment. Cooling water is replenished to the water tank 6 through the water supply pipe 23. The partition 24 can divide the interior of the water tank 6 into layers, allowing easily sedimented substances to settle to the bottom of the water tank 6. After a certain period of time, the sediment can be discharged through the discharge pipe 25.

[0024] like Figures 1 to 6As shown, this utility model discloses an industrial cooling tower steam recovery device. During operation, a humidity sensor 26 is connected to a controller. The humidity sensor 26 monitors the moisture content of water vapor inside the shell 1 in real time and sends the data to a server. The server compares the data with preset data and promptly activates the device. The blower 28 blows air into the blowing chamber through the air pipe 29 and out through the air outlet 30 to the top of the air outlet hood 27, reducing the pressure at the top of the air outlet hood 27 and increasing the flow velocity of water vapor inside the shell 1. The water vapor enters the shell 1 and then flows into the spiral heat exchange tube 3. Water is then introduced into the heat recovery tank 2 through the water inlet pipe 4. The spiral heat exchange tube 3 conducts heat from the water vapor into the water in the heat recovery tank 2, causing the temperature of the high-temperature water vapor to drop rapidly. After the water temperature in the heat recovery tank 2 increases, it is discharged through the hot water pipe 5, recovering the remaining heat from the water vapor. The water pump 10 is then activated to cool the water in the water tank 6. Water is extracted and fed into the condenser 7 through the condensate pipe 9. The return water pipe 11 ensures that the water in the condenser 7 is always kept at a low temperature. Water vapor comes into contact with the low-temperature side wall of the condenser 7 and condenses rapidly on the side wall. Then, the condensate flows down the inclined side wall to the shell 1 under the action of gravity. When the water vapor moves upward, it is guided by the cone at the bottom of the guide block 15, so that the water vapor flows towards the condenser 7. A part of the condensate in the condenser 7 is fed into the cooling chamber through the connecting pipe 16. When the water vapor passes above the guide block 15, it can be condensed. The condensate flowing down the outer wall of the condenser 7 and the guide block 15 is collected by the collecting ring 12 and flows into the collecting pipe 13. Impurities are filtered by the filter element 20, so that the water can be recycled. Unscrewing the bolt and pulling the sealing cover 22 moves the filter element 20 out of the filter box 18 for replacement and cleaning. Cooling water is replenished to the water tank 6 through the water supply pipe 23.

[0025] The water pump 10, filter element 20, humidity sensor 26 and air blower 28 of the industrial cooling tower steam recovery device of this utility model are commercially available. Technical personnel in this industry only need to install and operate them according to the accompanying instruction manual, without requiring any creative work from those skilled in the art.

[0026] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An industrial cooling tower steam recovery device, characterized in that, It includes a housing (1), a heat recovery component, a condensation component, a recovery filter component and an air extraction component. The heat recovery component is installed at the lower end of the housing (1), the condensation component is installed inside the housing (1) and located above the heat recovery component, the input end of the recovery filter component is installed on the inner wall of the housing (1), and the air extraction component is installed at the top of the housing (1). The heat recovery assembly includes a heat recovery box (2), multiple spiral heat exchange tubes (3), a water inlet pipe (4), and a hot water pipe (5). The heat recovery box (2) is fixedly installed on the lower part of the inner wall of the shell (1). Multiple spiral heat exchange tubes (3) are installed inside the heat recovery box (2). The input end of the spiral heat exchange tube (3) is connected to the lower part of the shell (1), and the output end of the spiral heat exchange tube (3) is connected to the upper part of the shell (1). The input end of the heat recovery box (2) is connected to the water inlet pipe (4), and the input end of the water inlet pipe (4) extends to the outside of the shell (1). The upper output end of the heat recovery box (2) is connected to the hot water pipe (5), and the hot water pipe (5) extends to the outside of the shell (1). Each hot water pipe (5) is equipped with a temperature control valve.

2. The industrial cooling tower steam recovery device as described in claim 1, characterized in that, The condensation assembly includes a water tank (6), a condenser cover (7), multiple condenser strips (8), a condensate pipe (9), a water pump (10), and a return pipe (11). The water tank (6) is fixedly installed on the lower outer wall of the housing (1). The condenser cover (7) is installed on the upper inner wall of the housing (1). The condenser cover (7) is hollow and conical. Multiple condenser strips (8) are installed on the bottom side wall of the condenser cover (7). The input end of the condenser cover (7) is connected to the condensate pipe (9). The input end of the condensate pipe (9) is connected to the output end of the water pump (10). The water pump (10) is installed on the top of the water tank (6), and the input end of the water pump (10) is located inside the water tank (6). The output end of the condenser cover (7) is connected to the return pipe (11). The output end of the return pipe (11) is connected to the inside of the water tank (6).

3. The industrial cooling tower steam recovery device as described in claim 2, characterized in that, It also includes two support rods (14), guide blocks (15), connecting pipes (16) and multiple heat dissipation fins (17). The top left and right sides of the guide block (15) are mounted on the bottom side wall of the condenser cover (7) through the support rods (14). The lower part of the guide block (15) is set as a cone, and the upper part of the guide block (15) is set as a frustum. A cooling chamber is opened inside the frustum. The cooling chamber is connected to two connecting pipes (16). The front connecting pipe (16) is connected to the inside of the condenser cover (7), and the output end of the rear connecting pipe (16) is connected to the return water pipe (11). Multiple heat dissipation fins (17) are evenly installed on the side wall of the water tank (6), and multiple heat dissipation holes are opened at the outer end of the heat dissipation fins (17).

4. The industrial cooling tower steam recovery device as described in claim 3, characterized in that, The recycling filter assembly includes a collection ring (12), a collection pipe (13), a filter box (18), two insert plates (19), a filter element (20), two limiting blocks (21), and a sealing cover (22). The collection ring (12) is installed on the inner wall of the housing (1) and located below the guide block (15). The collection pipe (13) is installed on the side wall of the housing (1). The input end of the collection pipe (13) is located above the collection ring (12), and the output end of the collection pipe (13) is connected to the filter box (18). The output end of the filter box (18) is connected to the inside of the water tank (6). The front and rear side walls of the filter box (18) are equipped with insert plates (19). The insert plates (19) have a limit groove inside. The filter element (20) is located inside the filter box (18). The front and rear ends of the filter element (20) are equipped with limit blocks (21). The limit blocks (21) are slidably installed in the limit groove. The left side wall of the filter element (20) is equipped with a sealing cover plate (22). The sealing cover plate (22) is installed on the left side wall of the filter box (18) by bolts.

5. The industrial cooling tower steam recovery device as described in claim 1, characterized in that, The air extraction assembly includes an air hood (27), an air blower (28), an air pipe (29), and multiple air outlets (30). The air hood (27) is installed on the top of the housing (1). An air blowing chamber is opened on the upper part of the air hood (27). Multiple air outlets (30) are evenly installed on the inner wall of the air hood (27). The input end of the air outlet (30) is connected to the inside of the air blowing chamber. The output end of the air outlet (30) is tilted upward. The air blower (28) is installed on the outer wall of the housing (1). The output end of the air blower (28) is connected to the air pipe (29). The output end of the air pipe (29) is connected to the air blowing chamber.

6. The industrial cooling tower steam recovery device as described in claim 2, characterized in that, It also includes a water supply pipe (23), a partition (24), a drain pipe (25), and a humidity sensor (26). The water supply pipe (23) is connected to the upper part of the water tank (6), the partition (24) is installed on the inner wall of the water tank (6), the lower part of the outer wall of the water tank (6) is connected to the drain pipe (25), a valve is installed on the drain pipe (25), and the humidity sensor (26) is installed on the lower inner wall of the housing (1).

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