A damp-proof electrical distribution cabinet special for geothermal energy supply and distribution system

Abstract

The present application relates to the technical field of power distribution equipment, and particularly relates to a damp-proof electrical power distribution cabinet special for geothermal energy supply and distribution system. The damp-proof electrical power distribution cabinet special for geothermal energy supply and distribution system comprises a power distribution cabinet body and a self-adaptive dehumidification system. The self-adaptive dehumidification system comprises: a condensation component arranged on the side wall of the power distribution cabinet body, one side of the condensation component facing the inside of the power distribution cabinet body forms a condensation surface, and the condensation component is used for condensing water in the hot and humid air flow in the inside of the power distribution cabinet body onto the condensation surface; a heat-driven flow guide component arranged in the inside of the power distribution cabinet body, and used for guiding the hot and humid air flow to the condensation surface according to the temperature in the inside of the power distribution cabinet body; and a liquid discharge component used for collecting and discharging the condensed water on the condensation surface. The power distribution cabinet provided by the present application realizes the continuous and directional discharge of water vapor in the cabinet under the high-temperature and high-humidity working condition of the geothermal station without consuming additional electric energy and without relying on regular maintenance.

Description

Technical Field

[0001] This invention relates to the technical field of power distribution equipment, and in particular to a moisture-proof electrical distribution cabinet specifically designed for geothermal energy supply and distribution systems. Background Technology

[0002] Geothermal energy supply and distribution systems are typically deployed near geothermal wellheads, heat exchange stations, or geothermal generator units. These sites share common characteristics: the underground thermal fluid continuously releases heat and moisture into the surrounding space during extraction and heat exchange, resulting in a persistently high-temperature and high-humidity environment. Relative humidity is generally above 80%, and in some enclosed or semi-enclosed equipment rooms, it even approaches saturation humidity. Simultaneously, electrical components such as circuit breakers, contactors, and frequency converters inside the distribution cabinet generate heat during operation, typically making the cabinet interior temperature higher than the exterior temperature. Conversely, when the system shuts down or the load suddenly drops, the cabinet interior temperature decreases rapidly. This periodic temperature change between operation and shutdown, coupled with the high humidity, makes it easy for moisture in the air inside the cabinet to reach its dew point during the temperature drop phase. This condensation forms on the surfaces of metal conductors, insulators, and circuit boards, leading to safety hazards such as decreased insulation resistance, potential breakdown, and accelerated corrosion of metal components.

[0003] Currently, the industry mainly adopts two types of solutions to address the issue of condensation prevention in power distribution cabinets.

[0004] The first type is electric heating dehumidification, which involves installing a heater inside the cabinet to continuously heat the air and maintain the temperature above the dew point, thus preventing condensation. This solution is applicable to industrial scenarios with stable power supply and continuous operation, but it has significant limitations in field geothermal stations: Firstly, the heater requires continuous power consumption, increasing energy consumption and the burden on power supply design at remote sites with limited power supply capacity; secondly, the heater itself is an additional heat source, and in scenarios where the distribution cabinet already needs to dissipate heat due to internal components, there is a functional conflict between heating and heat dissipation. If the heater malfunctions and shuts down, the temperature inside the cabinet drops rapidly, which may trigger a more severe condensation event.

[0005] The second type is adsorption dehumidification, which places moisture-absorbing materials such as silica gel and molecular sieves inside the cabinet, relying on physical or chemical adsorption to reduce the humidity inside the cabinet. The moisture-absorbing capacity of the materials is limited, and they will tend to saturate in a short time under continuous high humidity conditions. They need to be removed and regenerated or replaced periodically. In unattended field stations, the maintenance cost is high, the reliability is difficult to guarantee, and it cannot actively deal with the situation where a large amount of water vapor is released instantaneously due to a sudden drop in the temperature inside the cabinet. Summary of the Invention

[0006] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a moisture-proof electrical distribution cabinet specifically designed for geothermal energy supply and distribution systems. This moisture-proof electrical distribution cabinet, through the coordinated operation of condensation components, thermally driven flow guiding components, and drainage components, constructs a passive adaptive dehumidification closed loop. This loop uses the natural temperature difference outside the cabinet as a cold source and waste heat inside the cabinet as the driving force. Without consuming additional electrical energy or relying on regular maintenance, it achieves continuous and directional discharge of water vapor from the cabinet under high-temperature and high-humidity conditions at geothermal stations.

[0007] (II) Technical Solution To achieve the above objectives, this application provides a moisture-proof electrical distribution cabinet specifically designed for geothermal energy supply and distribution systems, comprising: a cabinet body; and an adaptive dehumidification system disposed on the cabinet body, the adaptive dehumidification system comprising: a condensation component disposed on the side wall of the cabinet body, the side of the condensation component facing the interior of the cabinet body forming a condensation surface for condensing moisture in the hot and humid airflow inside the cabinet body onto the condensation surface; a heat-driven flow guiding component disposed inside the cabinet body for guiding the hot and humid airflow to the condensation surface according to the temperature inside the cabinet body; and a drainage component for collecting and draining condensate from the condensation surface.

[0008] In one possible implementation, the condensation assembly includes: a thermally conductive substrate disposed through the side wall of the main body of the distribution cabinet; heat dissipation fins fixed to the end face of the thermally conductive substrate extending to the outside of the main body of the distribution cabinet; and a condensation plate fixed to the end face of the thermally conductive substrate extending to the inside of the main body of the distribution cabinet, wherein the side of the condensation plate facing the inside of the main body of the distribution cabinet forms a condensation surface.

[0009] In one possible implementation, the condensation assembly also includes a heat pipe, with the evaporation end of the heat pipe thermally connected to the condenser plate and the condensation end of the heat pipe thermally connected to the heat dissipation fins.

[0010] In one possible implementation, the condenser plate has several guide grooves on the side facing the inside of the distribution cabinet. The width and depth of each guide groove gradually decrease along the drain direction. The ends of each guide groove converge at the bottom of the condenser plate. The bottom of the condenser plate has a liquid outlet connected to the drain assembly. A hydrophobic coating is provided on the ridge between two adjacent guide grooves. A hydrophilic coating is provided on the concave surface inside each guide groove. The hydrophobic and hydrophilic coatings are distributed alternately.

[0011] In one possible implementation, the thermally driven flow guiding assembly includes a gas collecting hood, a rotating baffle, a snap-action bimetallic temperature controller, and a flow guiding tube. The gas collecting hood is fixed to the top wall inside the main body of the distribution cabinet, with its opening facing vertically downwards. The side wall of the gas collecting hood has an air outlet. The rotating baffle is hinged to the air outlet. The fixed end of the snap-action bimetallic temperature controller is connected to the gas collecting hood, and its free end is connected to the rotating shaft of the rotating baffle. The snap-action bimetallic temperature controller is configured such that when the internal temperature of the main body of the distribution cabinet is lower than a preset threshold, it continuously applies a constraint force to the rotating shaft through its free end to keep the rotating baffle closed. When the temperature rises to the preset threshold, it undergoes a snap deformation to release the constraint force and drive the rotating baffle to open the air outlet. One end of the flow guiding tube is connected to the air outlet, and the other end is connected to the condensation surface.

[0012] In one possible implementation, the free end of the snap-action bimetallic thermostat is positioned adjacent to the condensing surface, and the free end applies a momentary mechanical shock to the condensing surface when the snap-action bimetallic thermostat undergoes a snap deformation.

[0013] In one possible implementation, a vent hood is provided at the bottom of the condenser plate, with the outlet of the vent hood facing the heating element inside the main body of the distribution cabinet. The vent hood is used to direct the cold air at the bottom of the condenser plate to the heating element.

[0014] In one possible implementation, the drain assembly includes: a funnel disposed below the condensation surface for collecting condensate dripping from the condensation surface; a drain pipe vertically connecting the funnel to the inlet of the trap; and a trap whose outlet extends through the side wall of the main body of the distribution cabinet for forming a liquid seal between the drain pipe and the outlet through the condensate stored inside.

[0015] In one possible implementation, a flap is hinged to the outlet end of the water trap, and a counterweight is provided on the flap. The counterweight applies a restoring force to the flap to keep it closed. The flap is configured to open when the weight of the condensate column in the drain pipe exceeds the restoring force, and to reset and close when the weight of the condensate column is lower than the restoring force.

[0016] In one possible implementation, the drain assembly further includes a sealing ball and a limiting guide rail; the limiting guide rail is located inside the water inlet end of the trap and extends vertically, and the sealing ball can slide up and down along the limiting guide rail; a valve seat is provided at the water inlet end of the trap, the density of the sealing ball is less than the density of condensate, and the sealing ball and the valve seat are magnetically attracted to each other; the valve seat is located at a preset sealing position inside the trap, and the sealing ball is configured to float on the liquid surface when the liquid level inside the trap is higher than the preset sealing position, and fall down along the limiting guide rail to the valve seat and magnetically attract the valve seat when the liquid level drops below the preset sealing position, so as to seal the water inlet end of the trap.

[0017] (III) Beneficial Effects Compared with the prior art, the present invention provides a moisture-proof electrical distribution cabinet specifically for geothermal energy supply and distribution systems, which has the following beneficial effects: The geothermal energy supply and distribution system-specific moisture-proof electrical distribution cabinet provided by this invention features a condensation component that provides a condensation interface inside the cabinet that is consistently lower than the dew point of the surrounding air. This interface concentrates water vapor in the gas phase inside the cabinet, converting it into liquid water, allowing the water vapor to be removed from the gas phase at a fixed point through condensation. A thermally driven flow guiding component uses the cabinet's internal temperature as a control signal to directionally guide the hot and humid airflow to the condensation interface. It autonomously adjusts the flow guiding state without external control circuit intervention, increasing the water vapor flux reaching the condensation surface per unit time. A drain component continuously discharges the liquid water precipitated on the condensation interface out of the cabinet, preventing the accumulated liquid from evaporating back into the cabinet's gas phase. These three components, connected in series, form a unidirectional dehumidification channel of "water vapor accumulation → condensation and liquefaction → discharge outside the cabinet." The higher the humidity and the greater the temperature difference inside the cabinet, the greater the dehumidification flux, exhibiting adaptive adjustment characteristics. The condensation component uses the natural low temperature outside the cabinet as the cold source, while the heat-driven flow guiding component uses the waste heat generated by the electrical components inside the cabinet as the driving force. The entire system operation requires no additional power input and does not involve consumables that need to be replaced regularly. It can achieve continuous and reliable passive adaptive dehumidification under the long-term high temperature and high humidity conditions of the geothermal station. Attached Figure Description

[0018] Figure 1 This invention provides a structural schematic diagram of a moisture-proof electrical distribution cabinet specifically designed for geothermal energy supply and distribution systems. Figure 2 A schematic diagram of the structure of a condensation component provided by the present invention; Figure 3 A schematic diagram of the structure of a condenser plate provided by the present invention; Figure 4 This is a schematic diagram of the structure of a drainage component provided by the present invention.

[0019] Marked in the attached diagram: 1. Main body of the power distribution cabinet; 2. Condensation assembly; 21. Condensation surface; 22. Thermally conductive substrate; 23. Heat dissipation fins; 24. Condensation plate; 241. Airflow channel; 25. Heat pipe; 3. Thermally driven flow guiding assembly; 31. Gas collection hood; 32. Rotary baffle; 33. Snap-on bimetallic temperature control plate; 34. Flow guiding pipe; 4. Drainage assembly; 41. Funnel; 42. Drainage pipe; 43. Water trap; 431. Valve seat; 44. Flip plate; 441. Counterweight; 45. Sealing ball; 46. Limiting guide rail. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figures 1 to 4 This application provides a moisture-proof electrical distribution cabinet for a geothermal energy supply and distribution system, comprising: a cabinet body 1; an adaptive dehumidification system disposed on the cabinet body 1, the adaptive dehumidification system comprising: a condensation component 2 disposed on the side wall of the cabinet body 1, the side of the condensation component 2 facing the inside of the cabinet body 1 forming a condensation surface 21, used to condense moisture in the hot and humid airflow inside the cabinet body 1 onto the condensation surface 21; a heat-driven flow guiding component 3 disposed inside the cabinet body 1, used to guide the hot and humid airflow to the condensation surface 21 according to the temperature inside the cabinet body 1; and a drain component 4, used to collect and drain the condensate on the condensation surface 21.

[0022] In this invention, the condensation component 2 provides a condensation interface inside the cabinet that is consistently lower than the dew point of the surrounding air. This interface concentrates water vapor in the gas phase inside the cabinet, converting it into liquid water, allowing the water vapor to be removed from the gas phase at a fixed point through condensation. The thermally driven flow guiding component 3 uses the cabinet temperature as a control signal to guide the hot and humid airflow to the condensation interface. It autonomously adjusts the flow guiding state without external control circuit intervention, increasing the water vapor flux reaching the condensation surface 21 per unit time. The drain component 4 continuously drains the liquid water precipitated on the condensation interface out of the cabinet, preventing the accumulated liquid from evaporating back into the gas phase inside the cabinet. These three components, connected in series, form a unidirectional dehumidification channel of "water vapor accumulation → condensation and liquefaction → discharge outside the cabinet." The higher the humidity and the greater the temperature difference inside the cabinet, the greater the dehumidification flux, exhibiting adaptive adjustment characteristics. The condensation component 2 uses the natural low temperature outside the cabinet as the cold source, and the heat-driven flow guiding component 3 uses the waste heat generated by the electrical components inside the cabinet as the driving force. The entire system operation does not require additional power input, nor does it involve consumables that need to be replaced regularly. It can achieve continuous and reliable passive adaptive dehumidification under the long-term working conditions of high temperature and high humidity in the geothermal station.

[0023] Specifically, the condensation component 2 uses the temperature difference between the inside and outside of the cabinet to precipitate water vapor at a designated interface, rather than allowing it to condense randomly on the surface of conductive metal parts or insulating materials; the thermally driven flow guiding component 3 uses the temperature signal of the hot and humid airflow inside the cabinet as the driving condition, and only triggers the flow guiding when the hot and humid airflow accumulates and there is a risk of condensation. When it is not in the above state, the flow guiding channel is closed to avoid ineffective exchange of gases inside and outside the cabinet; the drain component 4 establishes a complete drain channel from the condensation surface 21 to the outside of the cabinet to ensure that condensate does not accumulate inside the cabinet.

[0024] In one specific embodiment, the geothermal energy supply and distribution system is installed near the geothermal wellhead, in a high-temperature and high-humidity environment year-round, with consistently high water vapor partial pressure in the air. During equipment operation, the temperature inside the cabinet is higher than the ambient temperature. When the system is shut down or the load drops sharply, the temperature inside the cabinet drops rapidly, making it easy for large-area condensation to occur on the surfaces of the metal parts and insulating materials inside the cabinet. In this scenario, the thermally driven flow guiding component 3 automatically activates when hot and humid airflow accumulates inside the cabinet, guiding the hot and humid airflow to the condensation surface 21 of the condensation component 2 to concentrate and precipitate condensate. The drainage component 4 continuously discharges the condensate outside the cabinet, maintaining a relatively low humidity state inside the cabinet, thereby reducing the probability of condensation on the surfaces of conductive and insulating parts.

[0025] In related technologies, two types of solutions are usually adopted to address the moisture problem of power distribution cabinets: one is to install heating rods or dehumidifiers inside the cabinet to reduce relative humidity by increasing the temperature inside the cabinet. This solution requires continuous power consumption and relies on a stable external power supply, which poses a reliability risk in scenarios where the power supply conditions of outdoor geothermal stations are limited; the other is to use adsorption materials such as silica gel and molecular sieves to adsorb water vapor inside the cabinet. This requires regular replacement or regeneration of the adsorption materials. In unattended scenarios, the maintenance cycle is short, the operation and maintenance cost is high, and the adsorption capacity is limited, making it difficult to cope with continuous high humidity conditions.

[0026] In this embodiment of the invention, the condensation component 2 utilizes natural temperature difference to achieve water vapor condensation, the thermally driven flow guiding component 3 is autonomously triggered by the temperature difference inside the cabinet as the driving condition, the entire adaptive dehumidification system does not require continuous power supply, and the drainage component 4 completes the discharge of condensate by gravity and liquid seal principle. The overall operation process does not consume additional energy and does not involve periodic replacement of consumables, making it well applicable to unattended geothermal station scenarios in the field.

[0027] In some embodiments, the condensation assembly 2 includes: a thermally conductive substrate 22, which is disposed through the side wall of the main body 1 of the power distribution cabinet; heat dissipation fins 23, which are fixed to the end face of the thermally conductive substrate 22 extending to the outside of the main body 1 of the power distribution cabinet; and a condensation plate 24, which is fixed to the end face of the thermally conductive substrate 22 extending to the inside of the main body 1 of the power distribution cabinet, and the side of the condensation plate 24 facing the inside of the main body 1 of the power distribution cabinet forms a condensation surface 21.

[0028] In this invention, the condensation assembly 2 consists of three parts: a thermally conductive substrate 22, heat dissipation fins 23, and a condenser plate 24, forming a complete heat transfer path from the inner condensation surface 21 of the main body 1 of the distribution cabinet to the outer heat dissipation surface. The thermally conductive substrate 22 is installed through the side wall of the main body 1 of the distribution cabinet, and is in contact with both the space inside the cabinet and the external environment, using the outside atmosphere as a natural cold source, eliminating the need for a compressor, refrigerant, and related piping required for active cooling. The heat dissipation fins 23 are fixed to the end face of the thermally conductive substrate 22 extending to the outer side of the main body 1 of the distribution cabinet, increasing the contact area with the outside air to reduce the thermal resistance of the outside heat dissipation and maintain the outer end face at a lower temperature level. The condenser plate 24 is fixed to the end face of the thermally conductive substrate 22 extending to the inner side of the main body 1 of the distribution cabinet, forming a fixed interface with the lowest temperature inside the cabinet, where water vapor preferentially precipitates rather than randomly condensing on the surface of conductive or insulating components.

[0029] Specifically, the through-mounting of the heat-conducting substrate 22 means that its two ends are exposed to the hot and humid environment inside the cabinet and the air environment outside the cabinet, respectively. The temperature difference between the two sides is the basis for maintaining the condensation effect. The arrangement of the heat dissipation fins 23 can be adapted to the ventilation conditions of the installation site. For example, in a natural ventilation scenario, the fin spacing can be appropriately increased to reduce airflow resistance, while in a scenario with forced ventilation, the number of fins can be appropriately increased to improve heat transfer intensity. As the only fixed interface with a continuously low temperature inside the cabinet, the condensation plate 24 limits the location of condensation to a controllable area. The surfaces of other conductive and insulating components inside the cabinet have relatively higher temperatures, and their tendency to condense water vapor is lower than that of the condensation plate 24, thus reducing the risk of surface condensation.

[0030] In one specific embodiment, the distribution cabinet is installed in an open outdoor geothermal station, where there is a certain natural wind speed throughout the year. The heat dissipation fins 23 are arranged facing the prevailing wind direction, and the outer end face maintains a low temperature level through heat dissipation via the fins. A stable heat transfer channel is established between the condenser plate 24 inside the cabinet and the heat dissipation fins 23 outside the cabinet through a thermally conductive substrate 22. When the hot and humid airflow inside the cabinet comes into contact with the condenser plate 24, water vapor precipitates on the surface of the condenser plate 24 and collects as liquid condensate, without diffusing and precipitating onto the surfaces of other components inside the cabinet; the location of condensation is clearly constrained.

[0031] In some embodiments, the condensation assembly 2 further includes a heat pipe 25, the evaporation end of the heat pipe 25 being thermally connected to the condenser plate 24, and the condensation end of the heat pipe 25 being thermally connected to the heat dissipation fins 23.

[0032] In this invention, the evaporation end of the heat pipe 25 is thermally connected to the condenser plate 24, and the condensation end is thermally connected to the heat dissipation fins 23. A heat transfer path is established between the condenser plate 24 and the heat dissipation fins 23 by utilizing the phase change cycle of the working fluid within the heat pipe 25. The heat transfer capacity of the heat pipe 25 automatically increases as the temperature difference between its two ends increases. The higher the temperature of the condenser plate 24, the faster the rate at which the heat pipe 25 transfers heat to the heat dissipation fins 23. Objectively, this provides a certain degree of adaptive regulation of the temperature of the condenser plate 24, helping to maintain the low temperature of the condenser plate 24 within a wider operating range.

[0033] Specifically, heat pipe 25 utilizes the phase change process of the working fluid absorbing heat and vaporizing at the evaporation end and releasing heat and liquefying at the condensation end to transfer heat. Compared with the heat-conducting substrate 22, which relies on cross-sectional thermal conductivity, heat pipe 25 has a stronger equivalent heat transfer capacity under the same heat transfer channel cross-section. It can reduce the thermal resistance between the condenser plate 24 and the heat dissipation fins 23 without increasing the cross-section of the heat-conducting substrate 22 (i.e., without enlarging the side wall mounting holes). In addition, the heat transfer of heat pipe 25 is positively correlated with the temperature difference between its two ends. When the heat load inside the cabinet increases and the temperature of the condenser plate 24 tends to rise, the heat transfer from heat pipe 25 to the heat dissipation fins 23 is enhanced, forming a negative feedback on the temperature of the condenser plate 24, without the need for additional adjustment mechanisms.

[0034] In one specific embodiment, the ambient temperature of the geothermal station is high in summer, and the heat dissipation conditions outside the cabinet are relatively poor. Relying solely on the heat conduction of the heat-conducting substrate 22 may not be sufficient to transfer the heat accumulated on the condenser plate 24 to the heat dissipation fins 23 in a timely manner, causing the temperature of the condenser surface 21 to rise and the condensation efficiency to decrease. After introducing the heat pipe 25, the working fluid phase change cycle continuously transfers the heat on the condenser plate 24 to the heat dissipation fins 23, enabling the condenser plate 24 to maintain a certain degree of subcooling in the high-temperature season and maintain its continuous condensation capacity for water vapor inside the cabinet.

[0035] In some embodiments, the condenser plate 24 is provided with a plurality of guide grooves 241 on the side facing the inside of the distribution cabinet body 1. The width and depth of each guide groove 241 gradually decrease along the drain direction. The ends of each guide groove 241 converge at the bottom of the condenser plate 24. The bottom of the condenser plate 24 is provided with a liquid outlet communicating with the drain assembly 4. A hydrophobic coating is provided on the ridge between two adjacent guide grooves 241. A hydrophilic coating is provided on the concave surface inside each guide groove 241. The hydrophobic coating and the hydrophilic coating are distributed alternately.

[0036] In this invention, the condenser plate 24 has several guide grooves 241 on the side facing the inside of the distribution cabinet body 1. The width and depth of the grooves gradually decrease along the drainage direction. The ends of each guide groove 241 converge at the bottom of the condenser plate 24, and the bottom of the condenser plate 24 has an outlet connected to the drainage assembly 4. A hydrophobic coating is provided on the ridge between two adjacent guide grooves 241, and a hydrophilic coating is provided on the concave surface inside each guide groove 241. The hydrophobic and hydrophilic coatings are distributed alternately. The hydrophilic coating on the concave surface of the groove, combined with the capillary pressure gradient generated by the gradual decrease in the width and depth of the groove along the drainage direction, provides a driving force for the condensate to flow towards the outlet. The wettability contrast between the hydrophobic coating on the ridge and the hydrophilic coating inside the groove causes the condensate droplets to not spread on the ridge but actively converge towards the concave surface of the adjacent groove. The two mechanisms work together to ensure that the condensate flows directionally to the outlet along the designed path after precipitation, reducing the overall residence time of the condensate on the condenser surface 21.

[0037] Specifically, the width and depth of the channel gradually decrease along the drainage direction, meaning that the liquid faces a continuously contracting flow channel cross-section in the drainage direction. The capillary pressure generated by the concave surface of the hydrophilic channel increases as the cross-section decreases, forming an increasing capillary pressure gradient along the drainage direction. This provides additional driving force for the condensate in addition to gravity, which is especially important when the amount of condensate is small and the gravity of the liquid column is insufficient to provide effective driving force. The hydrophobic and hydrophilic coatings are alternately distributed on the ridge and the concave surface of the channel. The contrast in wettability between the two prevents the droplets from spreading stably on the ridge and tends to migrate into the adjacent hydrophilic channel, preventing the liquid film from spreading across the entire condensation surface 21. The spread of the liquid film covering the condensation surface 21 would create a continuous thermal resistance, weakening the heat transfer from water vapor to the condensation surface 21, thus affecting the condensation rate. The combination of the guide channel 241 and the two types of coatings causes the condensate to flow directionally in the form of a liquid column rather than spreading in the form of a liquid film, which helps maintain the effective low-temperature area of ​​the condensation surface 21.

[0038] In one specific embodiment, the temperature difference between the inside and outside of the geothermal station cabinet is small during the transition season, resulting in a low condensation rate and a small amount of condensate per unit time. On the flat condensing surface 21 without the guide groove 241, a small amount of condensate spreads evenly in the form of a thin film, and the liquid film adheres for a long time, creating a continuous thermal resistance on the condensing surface 21. However, on the condensing plate 24 equipped with the guide groove 241 and two types of coatings, droplets are collected towards the concave surface of the groove under the action of the hydrophobic coating on the ridge, and then flow towards the outlet along the capillary pressure gradient. Even when the amount of condensate is small, the condensate can still flow directionally to the outlet for discharge, and the liquid film coverage area on the condensing surface 21 is relatively small, thus maintaining the effective condensing surface area 21.

[0039] In some embodiments, the thermally driven flow guiding assembly 3 includes a gas collecting hood 31, a rotating baffle 32, a snap-action bimetallic temperature control plate 33, and a flow guiding pipe 34. The gas collecting hood 31 is fixed to the inner top wall of the main body 1 of the distribution cabinet, with its opening facing vertically downwards. The side wall of the gas collecting hood 31 is provided with an air outlet. The rotating baffle 32 is hinged to the air outlet. The fixed end of the snap-action bimetallic temperature control plate 33 is connected to the gas collecting hood 31, and the free end is connected to the rotating shaft of the rotating baffle 32. The snap-action bimetallic temperature control plate 33 is configured such that when the internal temperature of the main body 1 of the distribution cabinet is lower than a preset threshold, it continuously applies a constraint force to the rotating shaft through its free end to keep the rotating baffle 32 closed. When the temperature rises to the preset threshold, it undergoes a snap deformation to release the constraint force and drive the rotating baffle 32 to open the air outlet. One end of the flow guiding pipe 34 is connected to the air outlet, and the other end is connected to the condensation surface 21.

[0040] In this invention, the gas collecting hood 31, the rotating baffle 32, the snap-action bimetallic temperature controller 33, and the guide pipe 34 together constitute the thermally driven flow guiding assembly 3. The gas collecting hood 31 is fixed to the inner top wall of the main body of the distribution cabinet 1, with its opening facing vertically downwards, collecting the rising hot and humid airflow that accumulates on the top of the cabinet. The snap-action bimetallic temperature controller 33 is configured to undergo a sudden deformation when the temperature inside the cabinet reaches a preset threshold, driving the rotating baffle 32 to switch directly from a closed state to an open state, opening the air outlet on the side wall of the gas collecting hood 31. The guide pipe 34 directly connects the air outlet to the condensation surface 21, allowing the hot and humid airflow accumulated in the gas collecting hood 31 to be directionally transported to the condensation surface 21 without diffusion or dilution within the cabinet space. The entire flow guiding triggering process uses the temperature inside the cabinet as the driving signal, requiring no external power supply or control system intervention.

[0041] Specifically, the opening of the gas collection hood 31 faces vertically downwards. This utilizes the physical property that hot, humid air has a lower density than dry, cold air, allowing the rising hot, humid airflow to naturally enter and accumulate within the hood without the need for mechanical suction. The "jump" characteristic of the snap-action bimetallic temperature control plate 33 is fundamentally different from that of a regular gradually bending bimetallic plate—a regular bimetallic plate bends continuously with temperature, causing the rotating baffle 32 to remain in a semi-open state for a long period over a considerable temperature range, resulting in a small flow guide cross-section and inability to completely close. The snap-action temperature control plate, however, deforms rapidly when the temperature reaches a preset threshold, driving the rotating baffle 32 to switch directly from completely closed to fully open. It also has a certain temperature hysteresis range, preventing the rotating baffle 32 from repeatedly opening and closing due to minor temperature fluctuations near the threshold. The guide pipe 34 directly connects the outlet to the condensing surface 21, ensuring that the airflow delivered to the condensing surface 21 maintains a high humidity concentration and increases the condensation rate per unit area.

[0042] In one specific embodiment, after the electrical equipment of the geothermal station's distribution cabinet is started, the load continues to rise, and the temperature inside the cabinet rises accordingly. Under the action of buoyancy, the hot and humid airflow continuously gathers towards the top of the cabinet and enters the gas collection hood 31. When the temperature inside the cabinet rises to the preset threshold of the snap-action bimetallic temperature controller 33, the temperature controller undergoes a snap deformation, the rotating baffle 32 fully opens the air outlet, and the hot and humid airflow accumulated in the gas collection hood 31 is directionally transported to the condensing surface 21 through the guide pipe 34 for condensation, completing one active dehumidification process; after the temperature inside the cabinet drops back to the lower limit of the hysteresis range, the temperature controller resets, and the rotating baffle 32 closes the air outlet again.

[0043] In some embodiments, the free end of the snap-action bimetallic thermostat 33 is disposed adjacent to the condensing surface 21, and the free end applies a momentary mechanical shock to the condensing surface 21 when the snap-action bimetallic thermostat 33 undergoes a snap deformation.

[0044] In this invention, the free end of the snap-action bimetallic temperature control plate 33 is disposed adjacent to the condensing surface 21. When a snap-action deformation occurs, the free end applies an instantaneous mechanical shock to the condensing surface 21. The snap-action deformation has a large displacement and a fast action speed. The free end completes the displacement in a very short time, and the resulting impact force acts directly on the condensing surface 21, providing additional inertial force to the condensed water droplets attached to the condensing surface 21, causing the droplets to overcome surface tension and detach from the condensing surface 21 in advance.

[0045] Specifically, under the combined influence of surface tension and gravity, condensate droplets on the condensing surface 21 will stably adhere to the surface before their volume reaches the critical value for self-sliding. When the condensation rate is low, the droplet accumulation rate is slow, and a large number of small droplets cover the condensing surface 21 for a long time, creating thermal resistance to the effective low-temperature area of ​​the condensing surface 21. The instantaneous mechanical shock generated by the sudden deformation applies external force to the droplets before their volume reaches the critical value, causing the droplets to fall off prematurely, reducing the residence time of the droplets on the condensing surface 21, and maintaining a larger effective condensing surface area 21. It is worth noting that the timing of the shock and the timing of the flow guide opening are completely synchronized—when the temperature inside the cabinet rises to the preset threshold, on the one hand, the rotating baffle 32 opens, and a new batch of hot and humid airflow will reach the condensing surface 21 through the flow guide pipe 34; on the other hand, the free end applies an instantaneous mechanical shock to the condensing surface 21, causing the existing droplets to fall off more quickly, leaving a larger effective condensing surface area 21 before the new airflow arrives. The two actions are coordinated in timing.

[0046] In some embodiments, the bottom of the condenser plate 24 is provided with an air guide hood, the outlet of which faces the heating element inside the main body 1 of the distribution cabinet. The air guide hood is used to guide the cold air at the bottom of the condenser plate 24 to the heating element.

[0047] In this invention, a vent hood is provided at the bottom of the condenser plate 24, with the outlet of the vent hood facing the heating element inside the main body 1 of the distribution cabinet. This vent hood is used to guide the cold air at the bottom of the condenser plate 24 to the heating element. The dry, cold air that has been condensed and dehumidified by the condenser plate 24 and settled at the bottom of the condenser plate 24 is guided by the vent hood to cover the heating element and directly cool it. After the cold air flows through the heating element, it is heated, its temperature increases, its density decreases, and it generates buoyancy and moves upward. This corresponds to the collection area of ​​the vent hood 31, pushing the hot and humid airflow into the vent hood 31 and maintaining the thermal circulation inside the cabinet.

[0048] Specifically, the outlet of the air guide hood faces the heating element, allowing the cold air to act on the surface of the heating element in a more concentrated manner. Compared with the state where the cold air naturally diffuses at the bottom of the cabinet without the air guide hood, this increases the concentration of contact between the cold air and the heating element, resulting in a more directional cooling effect. The airflow heated by the heating element rises to the top of the cabinet, corresponding to the opening position of the air collection hood 31. This creates a directional airflow path inside the cabinet, starting from the bottom of the condenser plate 24, flowing through the air guide hood to the heating element, rising heated and entering the air collection hood 31, and being guided by the guide pipe 34 to the condenser surface 21. This forms a passive thermodynamic cycle driven by the waste heat of the heating element, where dehumidification and heat dissipation are achieved simultaneously in the same airflow cycle.

[0049] In some embodiments, the drain assembly 4 includes: a funnel 41 disposed below the condensation surface 21 for collecting condensate dripping from the condensation surface 21; a drain pipe 42 vertically connecting the funnel 41 to the inlet end of the water trap 43; and a water trap 43, the outlet end of which extends through the side wall of the main body 1 of the distribution cabinet for forming a liquid seal between the drain pipe 42 and the outlet end through the condensate stored inside.

[0050] In this invention, the drainage assembly 4 consists of three parts: a funnel 41, a drainage pipe 42, and a water trap 43, which respectively perform the functions of collecting condensate, guiding vertical flow, and sealing discharge. The funnel 41 is located below the condensation surface 21 to collect the condensate dripping from the condensation surface 21; the drainage pipe 42 vertically connects the funnel 41 and the inlet end of the water trap 43, guiding the condensate downward by gravity; the outlet end of the water trap 43 extends through the side wall of the main body 1 of the distribution cabinet, and its bent pipe structure forms a liquid seal between the inlet end and the outlet end, establishing a gas barrier between the drainage channel and the external environment of the cabinet through the condensate stored inside.

[0051] Specifically, funnel 41 is positioned below the condensation surface 21, with a diameter larger than the outlet, providing a certain tolerance range for the position of condensate droplets and reducing the possibility of skewed droplets falling into the cabinet. The drain pipe 42 is vertically arranged, with gravity aligned with the liquid flow direction, and is not driven by power. The pipe diameter and length should be matched to the expected maximum condensate generation rate to avoid insufficient drainage and condensate backflow into funnel 41 at high condensation rates due to an insufficient pipe diameter. The trap 43 utilizes the normally retained condensate within the trap to form a continuous liquid column between the drain pipe 42 and the outlet, physically isolating the gas passage and preventing external air from flowing back into the cabinet along the drain channel. Compared to a mechanical seal cap at the outlet, the liquid seal requires no active switching action during normal drainage; drainage and sealing can be achieved simultaneously, without involving mechanical moving parts, eliminating the risk of valve jamming or wear.

[0052] In one specific embodiment, there are many insects at the outdoor installation site of the geothermal station. If the outlet of the drain pipe 42 is not sealed, insects can enter the cabinet along the drain pipe 42, affecting the safety of electrical equipment. At the same time, when the wind speed is high, external air may form a backflow along the drain pipe 42, introducing humid air from outside back into the cabinet and weakening the dehumidification effect. The condensate retained in the water trap 43 forms a liquid seal, which can continuously provide gas isolation in both of the above situations without the need for sensor triggering or manual intervention.

[0053] In some embodiments, a flap 44 is hinged to the outlet end of the water trap 43. The flap 44 is provided with a counterweight 441, which applies a reset force to the flap 44 to keep it closed. The flap 44 is configured to open when the weight of the condensate column in the drain pipe 42 exceeds the reset force, and to reset and close when the weight of the condensate column is lower than the reset force.

[0054] In this invention, a counterweight 441 is provided on the flap 44 hinged to the outlet end of the water trap 43. The counterweight 441 applies a reset force to the flap 44, keeping the flap 44 closed under normal conditions. The flap 44 is configured to open when the weight of the condensate column in the drain pipe 42 exceeds the reset force, and to close when the weight of the condensate column is lower than the reset force. The flap 44 forms a mechanical barrier at the outlet end, and together with the liquid seal in the water trap 43, forms a series sealing structure, which compensates for the relatively weakened sealing ability of the liquid seal when the liquid level is insufficient, and improves the overall sealing reliability of the drain channel.

[0055] Specifically, the magnitude of the restoring force exerted by the counterweight 441 on the flap 44 determines the minimum gravity threshold of the condensate column in the drain pipe 42 required for the flap 44 to open. The condensate column must accumulate to a certain height in the drain pipe 42 before its gravity can overcome the restoring force of the counterweight 441 and push the flap 44 open to drain the liquid. The mass of the counterweight 441 can be selected according to the condensate generation rate at the installation site to match the drainage rhythm with the condensation rate. The liquid seal relies on a certain height of condensate continuously remaining in the bend of the water trap 43. When the condensate generation rate is low, the height of the liquid seal column is relatively small, and external pressure fluctuations may damage the liquid seal. At this time, the flap 44 remains closed when the liquid level is insufficient to drive its opening, blocking the path of external air into the water trap 43 from the liquid outlet direction, forming a double protection with the liquid seal. The two complement each other in function.

[0056] In one specific embodiment, during the transitional season, the humidity inside the geothermal station cabinet is low, resulting in a slower condensate generation rate. The liquid level in the trap 43 remains near the bottom of the trap, and the liquid seal column is relatively short. At this time, occasional strong winds cause a brief period of positive pressure at the outlet. If relying solely on the liquid seal, this positive pressure could rupture the liquid column, allowing outside air to enter the cabinet. Since the weight of the condensate column is insufficient to overcome the restoring force of the counterweight 441, the flap 44 remains closed. The positive pressure acts on the closed flap 44 and is not directly transmitted to the liquid seal, thus maintaining the integrity of the liquid seal.

[0057] In some embodiments, the drain assembly 4 further includes a sealing ball 45 and a limiting guide rail 46; the limiting guide rail 46 is disposed inside the water inlet end of the water trap 43 and extends vertically, and the sealing ball 45 can slide up and down along the limiting guide rail 46; a valve seat 431 is provided at the water inlet end of the water trap 43, the density of the sealing ball 45 is less than the density of condensate, and the sealing ball 45 and the valve seat 431 are magnetically attracted to each other; the valve seat 431 is located at a preset sealing position in the water trap 43, and the sealing ball 45 is configured to float on the liquid surface when the liquid level in the water trap 43 is higher than the preset sealing position, and fall down along the limiting guide rail 46 to the valve seat 431 and magnetically attract the valve seat 431 when the liquid level drops below the preset sealing position, so as to block the water inlet end of the water trap 43.

[0058] In this invention, a vertically extending limiting guide rail 46 is provided on the inner side of the water inlet end of the water trap 43, and the sealing ball 45 can slide up and down along the limiting guide rail 46. A valve seat 431 is provided at the water inlet end of the water trap 43. The density of the sealing ball 45 is less than that of condensate, and the sealing ball 45 and the valve seat 431 are magnetically attracted to each other. The sealing ball 45 is configured to float on the liquid surface when the liquid level in the water trap 43 is higher than the preset sealing position, and to fall down along the limiting guide rail 46 to the valve seat 431 and magnetically attract the valve seat 431 when the liquid level drops below the preset sealing position, thereby sealing the water inlet end of the water trap 43. When the liquid level in the water trap 43 continues to drop due to evaporation or long-term disuse, and is eventually insufficient to maintain an effective liquid seal, the sealing ball 45 automatically sits down and seals, replacing the liquid seal with a mechanical dry seal to maintain the sealing state of the drainage channel.

[0059] Specifically, the fact that the density of the sealing ball 45 is less than that of the condensate is a structural prerequisite for its liquid level response behavior. When the liquid level is high, the sealing ball 45 floats on the liquid surface, not obstructing the downward flow of condensate in the drain pipe 42, and not interfering with the smooth flow of the normal drain channel. The limiting guide rail 46 constrains the movement path of the sealing ball 45, causing it to move downward along a fixed trajectory when the liquid level drops, ensuring that the landing point is precisely aligned with the valve seat 431, guaranteeing the repeatability and consistency of the magnetic attraction between the sealing ball 45 and the valve seat 431, and preventing the sealing ball 45 from deviating from the valve seat 431 due to vibration or water flow disturbance inside the cabinet. Magnetic attraction provides additional holding force compared to pure gravity pressing. When there are occasional positive pressure fluctuations in the drain pipe 42, the magnetic force provides the sealing ball 45 with anti-back pressure capability, reducing the risk that the sealing ball 45 will be pushed off the valve seat 431 due to positive pressure fluctuations. When the sealing ball 45 floats up to release the seal, the liquid level needs to rise to a height that can provide sufficient buoyancy to overcome the magnetic force. This threshold objectively requires that a certain liquid level accumulate in the water trap 43 before drainage can resume, so as to avoid the sealing ball 45 from frequently rising and falling when the liquid level only rises slightly.

[0060] In one specific embodiment, during the shutdown and maintenance of the geothermal station equipment, no new condensate is added, and the liquid level in the trap 43 continues to decrease with evaporation. After the liquid level drops to the valve seat 431, the sealing ball 45 falls to the valve seat 431 under the constraint of the limiting guide rail 46, magnetically engaging with the valve seat 431 and sealing the inlet of the trap 43. The drainage channel remains sealed during shutdown, requiring no manual operation. After resumption of operation, condensate re-accumulates in the trap 43, the liquid level rises, and the sealing ball 45 gains sufficient buoyancy to overcome the magnetic force and floats up, automatically releasing the seal and restoring normal drainage. The entire switching process is triggered by changes in liquid level, requiring no external control intervention.

[0061] It should be noted that the embodiments referred to in the specification, such as "one embodiment," "embodiment," "exemplary embodiment," and "some embodiments," may include specific features, structures, or characteristics, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0062] It should be readily understood that “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest manner, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on something” but also “on something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0063] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0064] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0065] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A moisture-proof electrical distribution cabinet specifically designed for geothermal energy supply and distribution systems, characterized in that, include: Main body of the power distribution cabinet (1); An adaptive dehumidification system is installed on the main body (1) of the power distribution cabinet. The adaptive dehumidification system includes: A condensation component (2) is disposed on the side wall of the main body (1) of the power distribution cabinet. The side of the condensation component (2) facing the inside of the main body (1) of the power distribution cabinet forms a condensation surface (21) for condensing the moisture in the hot and humid airflow inside the main body (1) of the power distribution cabinet onto the condensation surface (21). A heat-driven flow guiding component (3) is disposed inside the main body (1) of the power distribution cabinet and is used to guide hot and humid airflow to the condensing surface (21) according to the temperature inside the main body (1) of the power distribution cabinet. The drain assembly (4) is used to collect and drain the condensate on the condensate surface (21).

2. The moisture-proof electrical distribution cabinet for geothermal energy supply and distribution systems according to claim 1, characterized in that, The condensation component (2) includes: A heat-conducting substrate (22) is provided through the side wall of the main body (1) of the power distribution cabinet; Heat dissipation fins (23) are fixed to the end face of the heat-conducting substrate (22) extending to the outside of the main body (1) of the power distribution cabinet; A condenser plate (24) is fixed to the end face of the heat-conducting substrate (22) extending to the inside of the main body (1) of the power distribution cabinet. The condenser plate (24) facing the inside of the main body (1) of the power distribution cabinet forms the condenser surface (21).

3. The moisture-proof electrical distribution cabinet for geothermal energy supply and distribution systems according to claim 2, characterized in that, The condensation assembly (2) also includes a heat pipe (25), the evaporation end of which is thermally connected to the condenser plate (24), and the condensation end of which is thermally connected to the heat dissipation fins (23).

4. The moisture-proof electrical distribution cabinet for geothermal energy supply and distribution systems according to claim 2, characterized in that, The condenser plate (24) has several guide grooves (241) on the side facing the inside of the main body (1) of the power distribution cabinet. The width and depth of each guide groove (241) gradually decrease along the drain direction. The ends of each guide groove (241) converge at the bottom of the condenser plate (24). The bottom of the condenser plate (24) is provided with a liquid outlet that communicates with the drain assembly (4). A hydrophobic coating is provided on the ridge between two adjacent flow guide grooves (241), and a hydrophilic coating is provided on the concave surface inside each flow guide groove (241). The hydrophobic coating and the hydrophilic coating are distributed alternately.

5. The moisture-proof electrical distribution cabinet for geothermal energy supply and distribution systems according to claim 1, characterized in that, The thermally driven flow guiding assembly (3) includes a gas collection hood (31), a rotating baffle (32), a snap-action bimetallic temperature control plate (33), and a flow guiding pipe (34). The gas collection hood (31) is fixed to the inner top wall of the main body (1) of the power distribution cabinet, with the opening facing vertically downwards. The side wall of the gas collection hood (31) is provided with an air outlet. The rotating baffle (32) is hinged to the air outlet; The fixed end of the snap-action bimetallic temperature control plate (33) is connected to the gas collection hood (31), and the free end is connected to the rotating shaft of the rotating baffle (32). The snap-action bimetallic temperature control plate (33) is configured such that when the internal temperature of the main body (1) of the power distribution cabinet is lower than a preset threshold, the free end continuously applies a constraint force to the rotating shaft to keep the rotating baffle (32) closed. When the temperature rises to the preset threshold, a snap deformation occurs to release the constraint force and drive the rotating baffle (32) to open the gas outlet. One end of the guide pipe (34) is connected to the air outlet, and the other end is connected to the condensation surface (21).

6. The moisture-proof electrical distribution cabinet for geothermal energy supply and distribution systems according to claim 5, characterized in that, The free end of the snap-action bimetallic thermostat (33) is arranged adjacent to the condensing surface (21), and the free end applies instantaneous mechanical shock to the condensing surface (21) when the snap-action bimetallic thermostat (33) undergoes a snap deformation.

7. The moisture-proof electrical distribution cabinet for geothermal energy supply and distribution systems according to claim 2, characterized in that, The bottom of the condenser plate (24) is provided with an air guide hood, the outlet of which faces the heating element inside the main body (1) of the power distribution cabinet. The air guide hood is used to guide the cold air at the bottom of the condenser plate (24) to the heating element.

8. The moisture-proof electrical distribution cabinet for geothermal energy supply and distribution systems according to claim 1, characterized in that, The drainage assembly (4) includes: A funnel (41) is placed below the condensation surface (21) to collect the condensed water dripping from the condensation surface (21); The drain pipe (42) is vertically connected to the inlet end of the funnel (41) and the water trap (43); A water trap (43) with its outlet end protruding through the side wall of the main body (1) of the distribution cabinet is used to form a liquid seal between the drain pipe (42) and the outlet end through the condensate stored inside.

9. The moisture-proof electrical distribution cabinet for geothermal energy supply and distribution systems according to claim 8, characterized in that, The outlet end of the water trap (43) is hinged with a flap (44), and the flap (44) is provided with a counterweight (441). The counterweight (441) applies a reset force to the flap (44) to keep it closed. The flap (44) is configured to open when the weight of the condensate column in the drain pipe (42) exceeds the reset force, and to reset and close when the weight of the condensate column is lower than the reset force.

10. The moisture-proof electrical distribution cabinet for geothermal energy supply and distribution system according to claim 8, characterized in that, The drainage assembly (4) further includes a sealing ball (45) and a limiting guide rail (46); the limiting guide rail (46) is located on the inner side of the water inlet end of the water trap (43) and extends vertically; the sealing ball (45) can slide up and down along the limiting guide rail (46); a valve seat (431) is provided at the water inlet end of the water trap (43); the density of the sealing ball (45) is less than the density of condensate; the sealing ball (45) and the valve seat (431) are connected. The valve seat (431) is located in a preset sealing position within the water trap (43). The sealing ball (45) is configured to float on the liquid surface when the liquid level in the water trap (43) is higher than the preset sealing position, and to fall down to the valve seat (431) along the limiting guide rail (46) and magnetically engage with the valve seat (431) when the liquid level drops below the preset sealing position, so as to block the water inlet end of the water trap (43).

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