Dehumidifying device for switch cabinet

Abstract

A semiconductor chilling plate is fixed in a cabinet body, a heating surface is provided with a fan, a refrigeration surface is sealed in a channel, the upper part of the channel is open, the lower part of the channel is provided with an air suction port, the air suction port is provided with an air suction fan, the lower part of the air suction port is funnel-shaped, the funnel-shaped bottom is communicated with a drain pipe, and the drain pipe extends out of the cabinet body. The drain pipe is wrapped with a heat-insulating material; a temperature and humidity sensor is arranged in the cabinet body, temperature sensors are arranged on the refrigerating face and the heating face, the temperature and humidity sensor, the fan, the semiconductor refrigerating piece, the temperature sensors and the air suction fan are connected to a control panel through wires, and the control panel is provided with a display screen, an adjusting knob and a switch button. The utility model has the advantages that the refrigerating surface is arranged in the channel, the cooling capacity is controlled within the range of the refrigerating surface, water vapor condensation is facilitated, the fan is arranged outside the heating surface, heat can be quickly dissipated, a water collecting tank is omitted, the bottom of the channel is used for draining water, the heat insulation material isolates the cooling capacity, and no condensed water is formed outside the channel.

Description

Technical Field

[0001] The utility model belongs to the field of electrical switch cabinets and relates to a humidity regulation structure inside the switch cabinet. Background Art

[0002] A switch cabinet is an electrical device that controls the on and off of various devices. The external line of the switch cabinet first enters the main control switch inside the cabinet and then enters the sub-control switch, and each branch is set according to its needs. The components inside the switch cabinet mainly include circuit breakers, disconnectors, load switches, operating mechanisms, transformers, and various protection devices, etc.

[0003] Electrical equipment has certain requirements for the environmental humidity. Excessive humidity will have an adverse impact on electrical equipment. Generally, it is required that the relative humidity does not exceed 90% (below 25°C). In the switch project, when the relative humidity is greater than 80%, it is called high humidity. Therefore, the switch cabinet needs to be kept dry. Existing switch cabinets are generally installed outdoors. Although certain waterproof and moisture-proof measures are taken, they only play a role in preventing rainwater in the open air. During daily maintenance, moisture will enter the inside of the cabinet through the position of the cabinet door, resulting in the inside of the cabinet being damp, reducing the insulation performance, water molecules adhering to the surface of electrical components, affecting the working stability of electrical components, and when the humidity is too high and water condenses, it will cause corrosion and reduced lifespan of the metal structure of electrical components, and will also cause situations such as short circuits, flashovers, tripping, and burning.

[0004] A semiconductor refrigeration chip is a refrigeration device made based on the Peltier effect. Without a refrigerant, relying on the characteristics of semiconductor materials, after being energized, heat is absorbed and released at both ends respectively. Using a semiconductor refrigeration chip for dehumidification in a switch cabinet is a way, such as in patent CN201922491222.9. When using a semiconductor refrigeration chip for dehumidification, the structure for condensing and discharging moisture needs to be considered. A condensate plate is installed on one side of the refrigeration chip, and a water collection tank is connected below the condensate plate. The discharge pipe of the water collection tank extends outside the cabinet. Such a structure can play a certain dehumidification effect. At the same time, the condensate plate and the water collection tank receive cold energy. When the temperature difference between the inside and outside is large and the humidity inside the cabinet is also high, condensate water may appear on the outer wall of the water collection tank. If it causes dripping, it will also affect the safety of nearby devices.

[0005] Currently, the dehumidification devices of switch cabinets have problems such as low efficiency and a structure to be optimized. It is necessary to improve the dehumidification and moisture-proof devices of switch cabinets to solve the above problems. Summary of the Utility Model

[0006] The purpose of the utility model is to propose a dehumidification device for a switch cabinet.

[0007] Technical solution of the utility model: A dehumidification device for a switch cabinet. A semiconductor refrigeration sheet is fixed inside the cabinet. A fan is installed on the heating surface of the semiconductor refrigeration sheet. The refrigerating surface is enclosed in a channel made of heat-insulating material. The upper part of the channel is open, and the lower part of the channel is provided with an air inlet. An air suction fan is installed at the air inlet. The heat-insulating material below the air inlet shrinks into a funnel shape. The bottom of the funnel shape is connected to a drain pipe. The drain pipe extends outside the cabinet, and the outside of the drain pipe is wrapped with heat-insulating material. A temperature and humidity sensor is arranged inside the cabinet. Temperature sensors are arranged on both the refrigerating surface and the heating surface. The temperature and humidity sensor, the fan, the semiconductor refrigeration sheet, the temperature sensor, and the air suction fan are connected to a control board through wires. The control board has a display screen, an adjustment knob, and a switch button.

[0008] Preferably, the control board is fixed on the outer surface of the cabinet or arranged inside the cabinet and is in the same space as the semiconductor refrigeration sheet.

[0009] Furthermore, at least one semiconductor refrigeration sheet is provided, and each operates independently.

[0010] Furthermore, a serial port is reserved on the control board for communication with a host computer through the serial port.

[0011] Furthermore, an aluminum film is attached to the inner wall of the channel.

[0012] Advantages of the utility model: 1) The refrigerating surface is arranged in the channel, and the cold quantity is controlled within its range, which is beneficial to the condensation of water vapor. 2) A fan is arranged outside the heating surface, which can dissipate heat quickly. The fan can be started before the semiconductor refrigeration sheet is powered on for refrigeration to reduce the temperature of the hot surface in advance. After the humidity of the dehumidification device reaches the set target value after refrigeration, the semiconductor refrigeration sheet is powered off to stop refrigeration, while the heating surface fan continues to operate and is delayed to close, and the heat of the heating surface is further dissipated before the fan is closed. Through the above process, the heating surface is more fully cooled, the temperature of the refrigerating surface is lower, and the refrigeration efficiency is improved. 3) The water collecting tank is omitted, and the bottom of the channel is used for drainage, and the heat-insulating material isolates the cold quantity, and no condensed water is formed outside the channel. Description of the drawings

[0013] Figure 1 It is a structural schematic diagram of the utility model. Detailed implementation manners

[0014] A dehumidifying device for a switchgear cabinet. A semiconductor refrigerating sheet 2 is fixed inside the cabinet body 1. A fan 3 is installed covering the heating surface 21 of the semiconductor refrigerating sheet 2. The refrigerating surface 22 is enclosed in a channel 4 made of heat-insulating material 41. The upper part of the channel 4 is open, and an air suction port 42 is provided at the lower part of the channel 4. An air suction fan 9 is installed at the air suction port 42. The heat-insulating material 41 below the air suction port 42 shrinks into a funnel shape, and the bottom of the funnel shape is connected to a drain pipe 5. The drain pipe 5 extends outside the cabinet body 1, and the outside of the drain pipe 5 is wrapped with heat-insulating material; a temperature and humidity sensor 7 is arranged inside the cabinet body 1, and temperature sensors 6 are arranged on both the refrigerating surface 22 and the heating surface 21. The temperature and humidity sensor 7, the fan 3, the semiconductor refrigerating sheet 2, the temperature sensor 6, and the air suction fan 9 are connected to a control board 8 through a wire 10. The control board 8 has a display screen 81, an adjustment knob 82, a switch button 83, and a serial port 84. Communication is carried out with a host computer through the serial port 84. For the convenience of operation, the control board 8 can be fixed on the outer surface of the cabinet body 1. If the outer surface is not convenient for installation, it is arranged inside the cabinet body 1 and in the same cabinet space as the semiconductor refrigerating sheet.

[0015] For a switchgear cabinet with a relatively small volume, if the cooling capacity of one semiconductor refrigerating sheet can meet the dehumidification requirement of the switchgear cabinet, then one refrigerating sheet is adopted. First, the temperature and humidity inside the cabinet are collected by the temperature and humidity sensor 7, and the temperatures of the refrigerating surface 22 and the heating surface 21 are collected by the temperature sensor 6 and displayed on the display screen 81; second, the humidity start value and the humidity target value are set through the adjustment knob 82 on the control board 8; third, when the humidity inside the cabinet reaches the start value, the single-chip microcomputer inside the control board 8 controls the semiconductor refrigerating sheet 2 to be powered on. The refrigerating surface of the semiconductor refrigerating sheet 2 starts to refrigerate, and the temperature continuously decreases. The air inside the cabinet is disturbed by the fan 3, and the air suction fan 9 generates suction to suck the air into the channel 4. In the channel 4, the air contacts the refrigerating surface whose temperature is lower than the dew point of the air, and the moisture in the air condenses into water droplets. The water droplets flow to the drain pipe 5 under the action of gravity and are discharged outside the cabinet. Finally, when the humidity inside the cabinet drops to the humidity target value, the single-chip microcomputer controls the semiconductor refrigerating sheet 2 to be powered off, and the semiconductor refrigerating sheet 2 stops refrigerating. The temperature of the refrigerating surface 22 rises above the dew point of the air, and the dehumidification stops. When the humidity inside the cabinet reaches the set humidity start value again, the single-chip microcomputer will automatically control and power on the semiconductor refrigerating sheet 2 again, and the device starts the next round of dehumidification cycle.

[0016] In this application, a fan 3 is added to the heating surface 21 of the thermoelectric cooler 2 to specifically dissipate heat from the heating surface of the thermoelectric cooler quickly. Moreover, the logic of "starting the fan in advance before the thermoelectric cooler is powered on and delaying for a period of time to turn off the fan after the thermoelectric cooler is powered off" is added to the single-chip microcomputer program in the control board 8. The fan 3 is started in advance before the thermoelectric cooler 2 starts refrigerating to lower the temperature of the heating surface. After refrigeration, when the humidity in the cabinet reaches the set target value, the thermoelectric cooler stops refrigerating, while the fan 3 continues to operate for a period of time to further dissipate the heat from the heating surface. Through the above process, the heating surface 21 of the thermoelectric cooler 2 can be dissipated more fully, making the temperature of the cooling surface 22 lower and improving the refrigeration efficiency of the device. Preferably, the fan 3 is started when the humidity value reaches 1% less than the starting value, and the fan 3 is turned off when the temperature of the heating surface 21 drops to the ambient temperature of the cabinet. If the humidity still does not reach the starting value after the fan 3 has been started for 15 minutes, the fan is turned off. At the same time, the fan 3 can disturb the gas in the cabinet, making the humidity in the cabinet uniform and promoting the diffusion of the humid air to the inlet above the channel 4, accelerating the gas circulation; the heat on the heating surface 21 can also dry the air in the cabinet after entering the cabinet.

[0017] For a relatively large switch cabinet, when the cooling capacity of a single thermoelectric cooler cannot meet the dehumidification requirements of the switch cabinet, the number of thermoelectric coolers in the device can be expanded. For example, two or three cooling chips can be used, each operating independently. One or more cooling chips can be selectively turned on according to the humidity situation in the cabinet, ultimately achieving the purpose of both dehumidification and power consumption savings.

[0018] Furthermore, an aluminum film is attached to the inner wall of the channel 4. The aluminum film is smooth. If condensed water is generated on the inner wall of the channel 4, the condensed water on the aluminum film is likely to slide down, being able to drain away the condensed water in a timely manner.

Claims

1. A dehumidifying device for a switch cabinet, in which a semiconductor refrigerating sheet (2) is fixed inside a cabinet body (1), and is characterized in that: in The heating surface (21) of the thermoelectric cooler (2) is covered and installed with a fan (3), and the cooling surface (22) is enclosed in a channel (4) made of heat-insulating material (41). The upper part of the channel (4) is open, and the lower part of the channel (4) is provided with an air inlet (42). An air suction fan (9) is installed at the air inlet (42). The heat-insulating material (41) below the air inlet (42) shrinks into a funnel shape, and the bottom of the funnel shape is connected to a drain pipe (5). The drain pipe (5) extends outside the cabinet (1), and the outside of the drain pipe (5) is wrapped with heat-insulating material; a temperature and humidity sensor (7) is arranged inside the cabinet (1), and temperature sensors (6) are arranged on both the cooling surface (22) and the heating surface (21). The temperature and humidity sensor (7), the fan (3), the thermoelectric cooler (2), the temperature sensor (6), and the air suction fan (9) are connected to a control board (8) through wires (10). The control board (8) has a display screen (81), an adjustment knob (82), and a switch button (83).

2. The dehumidification device for switchgear according to claim 1, characterized in that: The control board (8) is fixed on the outer surface of the cabinet (1) or arranged inside the cabinet (1) and is in the same space as the thermoelectric cooler (2).

3. The dehumidifying device for switchgear according to claim 1, characterized in that: At least one thermoelectric cooler (2) is provided, and each operates independently.

4. The dehumidifying device for switchgear according to claim 1, characterized in that: A serial port (84) is reserved on the control board (8), and communication is carried out with a host computer through the serial port (84).

5. The dehumidifying device for switchgear as described in claim 1, characterized in that: An aluminum film is attached to the inner wall of the channel (4).

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