Outdoor power distribution cabinet condensation prevention structure and method

Abstract

The application relates to the technical field of condensation prevention of power distribution cabinets, in particular to an outdoor power distribution cabinet condensation prevention structure and method, a cabinet body and an inner layer on the inner side of the cabinet body, the cabinet body and the inner layer are fixedly connected with a partition on the lower side and are broken by the partition, the upper side of the partition is an upper cavity, the lower side is a lower cavity, the inner side of the bottom end of the inner layer is communicated with a wind cylinder, a fan is rotatably arranged on the inner side of the wind cylinder, the rotating shaft of the fan is fixed on the bottom end of the cabinet body, a vent is arranged at the inner layer of the lower side of the partition, the vent is lower than the top end of the wind cylinder, because hot air floats upwards, there is a certain temperature difference in the cabinet body, the application can intensify the difference, and the temperature difference is utilized to condense the air in the cabinet and reduce the absolute humidity in the cabinet, so that condensation is prevented, the mode of intensifying the temperature difference is that the hot air on the upper side of the cabinet is well insulated, and the hot air on the upper side of the cabinet enters the inner side of the lower cavity without insulation effect under the action of internal circulation, so that a larger temperature difference is generated.

Description

Technical Field

[0001] This invention relates to the field of condensation prevention technology for power distribution cabinets, specifically to a structure and method for preventing condensation in outdoor power distribution cabinets. Background Technology

[0002] As a crucial component of the power system, distribution cabinets play a vital role in power distribution, power control, and protection. Outdoor distribution cabinets frequently face condensation issues during operation; condensation occurs when the surface temperature of their internal components falls below the dew point temperature of the air inside the cabinet.

[0003] When the surface temperature of materials inside the distribution cabinet is lower than the dew point temperature inside the cabinet, condensation will occur on their surfaces. The non-uniformity of temperature changes of the materials inside the cabinet is an important reason why their temperature is lower than the dew point temperature. For example, the outer metal cabinet cools down faster, forming a condensation surface inside the cabinet. In special weather conditions, such as the "return to spring" phenomenon in the south, the outside air is close to saturation. This near-saturated air will enter the cabinet through the heat dissipation vents and air inlets, increasing the absolute humidity inside the cabinet and causing condensation. In the operation of the power distribution cabinet, the conductive components inside the cabinet are all heat sources. Because hot air rises, there is a certain temperature difference inside the cabinet. This invention can amplify this difference and use this temperature difference to condense the air inside the cabinet, reduce the absolute humidity inside the cabinet, thereby preventing condensation, which is highly efficient and energy-saving. To some extent, heat dissipation and condensation prevention in power distribution cabinets are contradictory. To prevent condensation, it is often necessary to increase sealing to prevent the variable external air from entering the interior. This invention can cleverly balance heat dissipation and condensation prevention in power distribution cabinets, greatly ensuring the stability of power supply. Compared with the existing technology that prevents condensation by long-term heating or dehumidifier operation, it can greatly save energy consumption and waste.

[0004] Therefore, a structure and method for preventing condensation in outdoor power distribution cabinets are proposed to address the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a structure and method for preventing condensation in outdoor power distribution cabinets. This invention can increase the temperature difference between the top and bottom of the cabinet and use this temperature difference to cause the air inside the cabinet to condense, thereby reducing the absolute humidity inside the cabinet and preventing condensation. It is highly efficient and energy-saving, and takes into account both heat dissipation and condensation prevention of the power distribution cabinet, greatly ensuring the stability of the power supply of the power distribution cabinet.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an outdoor power distribution cabinet condensation prevention structure, comprising a cabinet body and an inner layer inside the cabinet body, both the cabinet body and the inner layer being fixedly connected to a partition on the lower side and interrupted by the partition, the upper side of the partition being an upper cavity and the lower side being a lower cavity, the bottom end of the inner layer being connected to a duct, a fan being rotatably mounted on the inner side of the duct, and the rotating shaft of the fan being fixed to the bottom end of the cabinet body; An air vent is provided on the inner layer of the lower side of the partition, and the air vent is lower than the top of the air duct; A condensation and dehumidification assembly is installed in the cabinet on the lower side of the partition. The condensation and dehumidification assembly includes a motor and a semiconductor cooling chip fixed inside the cabinet. A cam roller is fixedly connected to the end of the motor's main shaft. A first moisture-absorbing element is fixedly connected to the outside of the cam roller. The first moisture-absorbing element is located on the lower side of the semiconductor cooling chip. The two sides of the semiconductor cooling chip are a hot surface and a cold surface, respectively. The cold surface faces the inside of the cabinet. Insulation strips are fixedly connected to both the upper and lower sides of the semiconductor cooling chip. A heat-conducting sheet for increasing the cold source area is fixedly connected to one side of the cold surface. The rotation of the cam roller enables internal or external circulation within the cabinet, thus removing moisture while simultaneously cooling the cabinet. In this invention, whether it is internal or external circulation, the air entering the cabinet will pass through the semiconductor cooling chip.

[0007] Because hot air rises, there is already a certain temperature difference inside the cabinet. This invention can amplify this difference and use it to cause the air inside the cabinet to condense, reducing the absolute humidity inside the cabinet and thus preventing condensation. It is highly efficient and energy-saving. The way to amplify the temperature difference is as follows: the hot air on the upper side of the cabinet is well insulated, while the hot air on the upper side of the cabinet will enter the lower cavity, which has no insulation effect, under the action of internal circulation, thus creating a large temperature difference. The cabinet itself amplifies the temperature difference, which facilitates condensation drainage and transfers the condensation from inside the cabinet to the lower cavity, thereby reducing the absolute humidity inside the cabinet and preventing condensation from occurring in key locations inside the cabinet. In a preferred embodiment of the condensation prevention structure for an outdoor power distribution cabinet according to the present invention, after moisture condenses on the heat-conducting sheet and the cold surface, it falls downward onto the surface of the first moisture-absorbing element and is transferred to the second moisture-absorbing element on the hot surface by capillary action as the cam roller rotates, thereby realizing the transfer of moisture on the cold and hot surfaces and enabling the moisture to evaporate quickly after condensation.

[0008] As a preferred embodiment of the condensation prevention structure for an outdoor power distribution cabinet according to the present invention, a fixed plate is fixedly connected to the outer side of the cabinet, a slide rod is slidably connected to the inner side of the fixed plate, a slide plate is fixedly connected to the outer side of the slide rod, a second moisture-absorbing element is located between the lower side of the slide plate and the outer side of the slide rod, and a spring is fixedly connected between the slide plate and the fixed plate. The spring is located on the outer side of the slide rod to ensure that the second moisture-absorbing element is in close contact with the first moisture-absorbing element during the rotation of the cam roller.

[0009] As a preferred embodiment of the condensation prevention structure for an outdoor power distribution cabinet according to the present invention, a pressure bead is fixedly connected to the bottom end of the slide rod. The pressure bead is embedded inside the first moisture-absorbing element. During the rotation of the cam roller, the pressure bead squeezes the first moisture-absorbing element and the first moisture-absorbing element makes interference contact with the second moisture-absorbing element. The squeezed-out water enters the inside of the second moisture-absorbing element under capillary action and evaporates rapidly under the high temperature of the hot surface, thus achieving circulation.

[0010] In this invention, the humidity transfer method is as follows: after the side of the first moisture-absorbing element closest to the cabinet is moistened, as the cam roller rotates, the left cam roller rotates counterclockwise and the right cam roller rotates clockwise. Because the pressure bead can be embedded into the inside of the first moisture-absorbing element under the action of the spring, during the rotation, the pressure bead will squeeze out the water at the contact position of the first moisture-absorbing element. The squeezed-out water will be transferred to the second moisture-absorbing element that can always be in contact with the first moisture-absorbing element under capillary action. Because when the semiconductor cooling chip is working, it cools on one side and heats on the other side. The cold side is used to intensify condensation, while the hot side can be used to evaporate water, thereby making full use of electrical energy and achieving the effect of energy saving. The first and second moisture-absorbing components are made of cotton fabric. As a preferred embodiment of the condensation prevention structure for an outdoor power distribution cabinet according to the present invention, the front end of the cabinet is hinged with a cabinet door. When the cabinet door is closed, it has a sealing effect with the cabinet body. The bottom inner side of the inner layer of the cabinet body is fixedly connected with a cable outlet pipe for threading the incoming and outgoing cables of the power distribution cabinet. After the cables are threaded, the cable outlet pipe is sealed with sealant to reduce the gas exchange between the cabinet body and the outside world.

[0011] As a preferred embodiment of the condensation prevention structure for an outdoor power distribution cabinet of the present invention, a temperature sensor for obtaining the internal temperature of the cabinet is fixedly connected to the upper side of the inner layer, and a humidity sensor for obtaining the external humidity is fixedly connected to the top of the cabinet and the bottom of the inner layer. The humidity sensor inside the cabinet is placed on the lower side of the cabinet because the temperature at the bottom of the cabinet is lower and the moisture is more easily saturated. In other words, the humidity sensor is installed in a position with high relative humidity inside the cabinet, and the reference humidity value provided has more safety redundancy. When the outside temperature is lower than the inside temperature of the cabinet, the fan blows air upwards, causing the airflow in the middle of the cabinet to move upwards. Under the action of the fan's intake, the airflow on both sides of the cabinet descends, enters the inner side of the lower cavity through the air vents, and flows back to the fan's intake. During this process, because the upper part of the cabinet is insulated through the double-layer hollow structure of the cabinet body and inner layer, the lower cavity is in direct contact with the cabinet body, which has high thermal conductivity. The cabinet body is made of metal and is relatively sensitive to changes in the outside temperature. The "high temperature" air in the upper part of the cabinet enters the "low temperature" lower cavity and condenses there, thereby reducing the absolute humidity.

[0012] As a preferred embodiment of the condensation prevention structure for an outdoor power distribution cabinet according to the present invention, in the initial state, the cam roller is set vertically. At this time, the cam roller has the maximum vertical height, and the cam roller completely blocks its position. When the fan is working, it is in internal circulation.

[0013] As a preferred embodiment of the condensation prevention structure for an outdoor power distribution cabinet according to the present invention, after the cam roller rotates 90°, gaps will appear at both the upper and lower positions of the cam roller. The cam roller separates the upper and lower gaps, and the upper gap will be blocked by the descending second moisture-absorbing component. Because there is an opening at the bottom of the second moisture-absorbing component, the gap on the upper side of the cam roller forms an air inlet for air to enter the cabinet. A metal sheet can be fixed on the side of the second moisture-absorbing component near the cabinet to reduce the sliding resistance of the second moisture-absorbing component.

[0014] The notch at the bottom becomes the air outlet for the cabinet. When the fan reverses, the bottom becomes the air outlet for the fan, thus achieving external circulation.

[0015] During external circulation, the fan reverses, and the notch on the lower side becomes the air outlet for the cabinet. Negative pressure is created inside the cabinet, and the notch on the upper side of the cam roller forms an air inlet for air to enter the cabinet, thus achieving external circulation and expelling the heat inside the cabinet. This circulation can accelerate heat dissipation. As a preferred embodiment of the condensation prevention structure for an outdoor power distribution cabinet of the present invention, the inner layer is made of heat-insulating material to further enhance the heat-insulating effect and prevent condensation caused by temperature differences due to delayed heat transfer. A moisture-absorbing layer is fixedly connected to the top inner side of the inner layer to prevent the condensed liquid from dripping directly from the upper part, thus serving as a water storage transition layer.

[0016] A method for preventing condensation on outdoor electrical distribution cabinets, comprising: Method 1: Because the cabinet of the present invention has a double-layer structure, it can play a good heat preservation effect, thereby making the temperature difference between the inner side and the inside of the cabinet similar, thus reducing the possibility of condensation. The wiring components inside the distribution cabinet itself are not a large heat source. Compared with the existing technology, which also sets heating components to achieve dehumidification, the double-layer structure of the present invention will not cause the distribution cabinet to not work at a safe temperature. Method 2: In low-temperature environments, the internal temperature of the cabinet does not exceed the allowable range of the distribution cabinet. Due to the existence of tiny gaps in the cabinet, there is always airflow exchange between the inside and outside of the cabinet. When the relative humidity inside the cabinet approaches 90%, the semiconductor cooling chip does not work, the fan works, and the air is blown upward. Under the action of internal circulation, the "hot air" on the upper side comes into contact with the cold source of the cabinet on the lower side that is in direct contact with the outside. Condensation occurs at the contact surface, and the condensed water falls onto the first moisture-absorbing component, thereby reducing the absolute humidity inside the cabinet and preventing condensation. Method 3: When the external humidity is high and there is slight heat accumulation inside the cabinet, the semiconductor cooling chip works, the fan works, and the air is blown upward. Under the action of internal circulation, the "hot air" on the upper side comes into contact with the cold surface of the semiconductor cooling chip, and condensation occurs at the contact surface. The condensed water falls onto the first moisture-absorbing component, thereby reducing the absolute humidity inside the cabinet and preventing condensation. Method 4: When the temperature inside the cabinet is high, the cam roller is placed horizontally, the semiconductor cooling chip is working, the fan is working, and the air is vented downwards. The hot air inside the cabinet is discharged through the lower cavity and the outside of the cam roller. Under the action of external circulation, the outside air first passes through the cold surface of the semiconductor cooling chip. After condensation and cooling occur at the contact surface, it enters the inside of the cabinet, thereby reducing the absolute humidity inside the cabinet and achieving heat dissipation.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. This outdoor power distribution cabinet condensation prevention structure addresses the inherent temperature difference within the cabinet due to the rising of hot air. This invention amplifies this temperature difference, causing condensation inside the cabinet and reducing the absolute humidity, thus preventing condensation. It is highly efficient and energy-saving. The amplification of the temperature difference occurs as follows: the hot air on the upper side of the cabinet is well insulated, while the hot air on the upper side, through internal circulation, enters the lower cavity, which lacks insulation, creating a significant temperature difference. This temperature difference is amplified by the cabinet itself, facilitating condensation drainage and transferring condensation from inside the cabinet to the lower cavity, thereby reducing the absolute humidity and preventing condensation from occurring in critical areas within the cabinet.

[0018] 2. This outdoor power distribution cabinet condensation prevention structure can achieve internal or external circulation inside the cabinet through the rotation of the cam roller, thereby removing moisture while also ensuring heat dissipation of the cabinet.

[0019] 3. In this invention, the humidity transfer method of the outdoor power distribution cabinet condensation prevention structure is as follows: after the side of the first moisture-absorbing element close to the cabinet is moistened, as the cam roller rotates, the left cam roller rotates counterclockwise and the right cam roller rotates clockwise. Because the pressure bead can be embedded into the inner side of the first moisture-absorbing element under the action of the spring, during the rotation, the pressure bead will squeeze out the water at the contact position of the first moisture-absorbing element. The squeezed water will be transferred to the second moisture-absorbing element that can always be in contact with the first moisture-absorbing element under the capillary action. Because when the semiconductor cooling chip is working, it cools on one side and heats on the other side. The cold side is used to intensify condensation, and the hot side can be used to evaporate water, thereby making full use of electrical energy and achieving the effect of energy saving. 4. This type of outdoor distribution cabinet condensation prevention structure, when the outside temperature is lower than the cabinet's internal temperature, the fan blows air upwards, causing the airflow in the middle of the cabinet to move upwards. Under the action of the fan's air intake, the airflow on both sides of the cabinet descends, enters the inner side of the lower cavity through the air vents, and flows back to the fan's air intake. During this process, because the upper part of the cabinet is insulated through the double-layer hollow structure of the cabinet body and inner layer, the lower cavity is in direct contact with the cabinet body, which has high thermal conductivity. The cabinet body is made of metal and is relatively sensitive to changes in the outside temperature. The "high temperature" air in the upper part of the cabinet enters the "low temperature" lower cavity and condenses in the lower cavity, thereby reducing the absolute humidity.

[0020] 5. In the initial state, the cam roller is set vertically, and at this time, the cam roller has the maximum vertical height. The cam roller completely blocks its position. When the fan is working, it is an internal circulation. When it is an external circulation, the fan reverses, and the notch on the lower side becomes the air outlet of the cabinet. Negative pressure appears inside the cabinet. The notch on the upper side of the cam roller forms an air inlet to the inside of the cabinet, thereby realizing external circulation and expelling the heat inside the cabinet. This circulation can accelerate heat dissipation.

[0021] 6. This outdoor distribution cabinet condensation prevention structure activates the semiconductor cooling chip and fan when the external humidity is high and there is slight heat buildup inside the cabinet. Air is directed upwards, and under internal circulation, the "hot air" from the top comes into contact with the cold surface of the semiconductor cooling chip, causing condensation. The condensate falls onto the first moisture-absorbing element, thereby reducing the absolute humidity inside the cabinet and preventing condensation. 7. This outdoor distribution cabinet condensation prevention structure, when the temperature inside the cabinet is high, the cam roller is placed horizontally, the semiconductor cooling chip works, the fan works, and the air is discharged downwards. The hot air inside the cabinet is discharged through the lower cavity and the outside of the cam roller. Under the action of external circulation, the outside air first passes through the cold surface of the semiconductor cooling chip. After condensation and cooling occur at the contact surface, it enters the inside of the cabinet, thereby reducing the absolute humidity inside the cabinet and achieving heat dissipation. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall appearance and structure of the present invention; Figure 2 This is a schematic cross-sectional view of the overall structure of the present invention; Figure 3 For the present invention Figure 2 A magnified structural diagram at point A; Figure 4 This is a schematic diagram of the external structure of the cam roller in this invention; Figure 5 For the present invention Figure 4 A schematic diagram of the structure at point B; Figure 6 This is a schematic diagram of the external structure of the cold surface of the present invention; Figure 7 This is a schematic diagram of the internal circulation flow structure of the present invention when preventing condensation while ensuring minimal heat dissipation; Figure 8 This is a schematic diagram of the external circulation flow structure of the present invention when preventing condensation while ensuring large heat dissipation; In the diagram: 1. Cabinet body; 101. Inner layer; 1011. Air vent; 102. Upper cavity; 103. Lower cavity; 104. Outlet conduit; 105. Air duct; 2. Cabinet door; 3. Moisture-absorbing layer; 4. Temperature sensor; 5. Humidity sensor; 6. Motor; 7. First moisture-absorbing component; 71. Cam roller; 8. Second moisture-absorbing component; 9. Opening; 10. Slide plate; 11. Fixing plate; 12. Slide rod; 121. Pressure ball; 13. Fan; 14. Partition; 15. Semiconductor cooling chip; 151. Cold side; 152. Hot side; 1511. Heat-conducting sheet; 16. Insulation strip. Detailed Implementation

[0023] 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.

[0024] Example 1, please refer to Figures 1-8 The present invention provides a technical solution: An outdoor power distribution cabinet condensation prevention structure includes a cabinet body 1 and an inner layer 101 on the inner side of the cabinet body 1. Both the cabinet body 1 and the inner layer 101 are fixedly connected to a partition 14 on the lower side and are interrupted by the partition 14. The upper side of the partition 14 is an upper cavity 102 and the lower side is a lower cavity 103. The bottom end of the inner layer 101 is connected to a duct 105. A fan 13 is rotatably installed on the inner side of the duct 105. The rotation shaft of the fan 13 is fixed to the bottom end of the cabinet body 1. An air vent 1011 is provided at the inner layer 101 on the lower side of the partition 14, and the air vent 1011 is lower than the top of the air duct 105; A condensation and dehumidification assembly is installed at the cabinet 1 on the lower side of the partition 14. The condensation and dehumidification assembly includes a motor 6 and a semiconductor cooling chip 15 fixed inside the cabinet 1. A cam roller 71 is fixedly connected to the end of the main shaft of the motor 6. A first moisture-absorbing element 7 is fixedly connected to the outer side of the cam roller 71. The first moisture-absorbing element 7 is located on the lower side of the semiconductor cooling chip 15. The two sides of the semiconductor cooling chip 15 are a hot surface 152 and a cold surface 151, respectively. The cold surface 151 faces the inside of the cabinet 1. Insulation strips 16 are fixedly connected to both the upper and lower sides of the semiconductor cooling chip 15. A heat-conducting sheet 1511 for increasing the cold source area is fixedly connected to one side of the cold surface 151. The rotation of the cam roller 71 enables internal or external circulation within the cabinet 1, thereby removing moisture while simultaneously dissipating heat from the cabinet 1. In this invention, whether it is internal or external circulation, the air entering the cabinet will pass through the semiconductor cooling chip.

[0025] Because hot air rises, there is already a certain temperature difference inside the cabinet. This invention can amplify this difference and use it to cause the air inside the cabinet to condense, thereby reducing the absolute humidity inside the cabinet and preventing condensation. It is highly efficient and energy-saving. The way to amplify the temperature difference is as follows: the hot air on the upper side of the cabinet is well insulated, and under the action of internal circulation, the hot air on the upper side of the cabinet will enter the lower cavity 103, which has no insulation effect, thus creating a large temperature difference. The cabinet itself amplifies the temperature difference, which facilitates condensation drainage and transfers the condensation from inside the cabinet to the lower cavity 103, thereby reducing the absolute humidity inside the cabinet and preventing condensation from occurring in key locations inside the cabinet. Specifically, after the moisture condenses on the heat-conducting plate 1511 and the cold surface 15, it falls down to the surface of the first moisture-absorbing element 7, and is transferred to the second moisture-absorbing element 8 at the hot surface 152 by capillary action as the cam roller 71 rotates, realizing the transfer of moisture between the cold surface 151 and the hot surface 152, so that the moisture can evaporate quickly after condensation.

[0026] Specifically, a fixed plate 11 is fixedly connected to the outer side of the cabinet 1, a slide rod 12 is slidably connected to the inner side of the fixed plate 11, a slide plate 10 is fixedly connected to the outer side of the slide rod 12, a second moisture-absorbing element 8 is located between the lower side of the slide plate 10 and the outer side of the slide rod 12, and a spring is fixedly connected between the slide plate 10 and the fixed plate 11. The spring is located on the outer side of the slide rod 12 to ensure that the second moisture-absorbing element 8 is in close contact with the first moisture-absorbing element 7 during the rotation of the cam roller 71.

[0027] Specifically, a pressure bead 121 is fixedly connected to the bottom end of the slide bar 12. The pressure bead 121 is embedded in the inner side of the first moisture-absorbing element 7. During the rotation of the cam roller 71, the pressure bead 121 squeezes the first moisture-absorbing element 7 and the first moisture-absorbing element 7 makes interference contact with the second moisture-absorbing element 8. The squeezed-out water enters the inner side of the second moisture-absorbing element 8 under capillary action and evaporates quickly under the high temperature of the hot surface 152, thus achieving circulation.

[0028] In this invention, the humidity transfer method is as follows: after the side of the first moisture-absorbing element 7 near the inside of the cabinet is moistened, as the cam roller 71 rotates, the left cam roller 71 rotates counterclockwise and the right cam roller 71 rotates clockwise. Because the pressure bead 121 can be embedded into the inside of the first moisture-absorbing element 7 under the action of the spring, during the rotation, the pressure bead 121 will squeeze out the water at the contact position of the first moisture-absorbing element 7. The squeezed water will be transferred to the second moisture-absorbing element 8 that can always be in contact with the first moisture-absorbing element 7 under capillary action. Because when the semiconductor cooling chip 15 is working, it cools on one side and heats on the other side. The cold side 151 is used to intensify condensation, and the hot side 152 can be used to evaporate water, thereby making full use of electrical energy and playing an energy-saving role. The first moisture-absorbing component 7 and the second moisture-absorbing component 8 are made of cotton cloth. Specifically, cabinet 1 is hinged to a cabinet door 2 at the front end. When the cabinet door 2 is closed, it has a sealing effect with the cabinet 1. The bottom inner side of the inner layer 101 of the cabinet 1 is fixedly connected to a cable outlet pipe 104 for passing through the incoming and outgoing cables of the power distribution cabinet. After the cables are passed through, the cable outlet pipe 104 is sealed with sealant to reduce the gas exchange between the cabinet 1 and the outside.

[0029] Specifically, a temperature sensor 4 for obtaining the internal temperature of the cabinet 1 is fixedly connected to the upper side of the inner layer 101, and a humidity sensor 5 for obtaining the external humidity is fixedly connected to the top of the cabinet 1 and the bottom of the inner layer 101. The humidity sensor 5 is placed on the lower side of the cabinet because the temperature at the bottom of the cabinet is lower and the moisture is more easily saturated. In other words, the humidity sensor 5 is installed in a position with high relative humidity inside the cabinet, and the reference humidity value provided has more safety redundancy. When the outside temperature is lower than the inside temperature of the cabinet, the fan 13 blows air upwards, and the airflow in the middle of the cabinet 1 moves upwards. Under the action of the fan 13, the airflow on both sides of the cabinet 1 descends and enters the inner side of the lower cavity 103 through the air outlet 1011, and flows back to the air inlet of the fan 13. During this process, because the upper part of the cabinet 1 is insulated through the double-layer hollow structure of the cabinet 1 and the inner layer 101, the lower cavity 103 is in direct contact with the cabinet 1, which has high thermal conductivity. The cabinet 1 is made of metal and is more sensitive to changes in the outside temperature. The "high temperature" air in the upper part of the cabinet 1 enters the "low temperature" lower cavity 103 and condenses in the lower cavity 103, thereby reducing the absolute humidity.

[0030] Specifically, in the initial state, the cam roller 71 is set vertically. At this time, the cam roller 71 has the maximum vertical height. The cam roller 71 completely blocks its position. When the fan 13 is working, it is in internal circulation.

[0031] Specifically, after the cam roller 71 rotates 90°, gaps will appear at both the upper and lower positions of the cam roller 71. The cam roller 71 will separate the upper and lower gaps. The upper gap will be blocked by the descending second moisture-absorbing component 8. Because there is an opening 9 at the bottom of the second moisture-absorbing component 8, the gap on the upper side of the cam roller 71 forms an air inlet for air to enter the cabinet 1. A metal sheet can be fixed on the side of the second moisture-absorbing component 8 near the cabinet 1 to reduce the sliding resistance of the second moisture-absorbing component 8.

[0032] The notch on the lower side becomes the air outlet of cabinet 1. When fan 13 reverses, the lower part becomes the air outlet of fan 13, thus achieving external circulation.

[0033] During external circulation, the fan 13 reverses, and the lower notch becomes the air outlet of the cabinet 1. Negative pressure appears inside the cabinet, and the upper notch of the cam roller 71 forms an air inlet for air to enter the cabinet 1, thereby realizing external circulation and expelling the heat inside the cabinet. This circulation can accelerate heat dissipation. Specifically, the inner layer 101 is made of heat-insulating material, which further enhances the heat-insulating effect and prevents condensation caused by temperature differences due to delayed heat transfer. A moisture-absorbing layer 3 is fixedly connected to the top inner side of the inner layer 101 to prevent the liquid condensed on the upper part from dripping directly, thus serving as a water storage transition layer.

[0034] Method 1: Applicable to high-altitude and low-temperature areas. Because the cabinet 1 of this invention has a double-layer structure, it can play a good heat preservation role, so that the temperature difference between the inner side 101 and the gas inside the cabinet 1 is similar, thereby reducing the possibility of condensation. The wiring components inside the distribution cabinet itself are not a large heat source. Compared with the existing technology, which also sets heating components to achieve dehumidification, the double-layer structure of this invention will not cause the distribution cabinet to not work at a safe temperature. In low-temperature environments, the temperature inside cabinet 1 does not exceed the allowable range of the distribution cabinet. Due to the presence of tiny gaps in cabinet 1, there is always airflow exchange between the inside and outside of cabinet 1. When the relative humidity inside cabinet 1 approaches 90%, the semiconductor cooling chip 15 does not work, and the fan 13 works, blowing air upwards. Under the action of internal circulation, the "hot air" on the upper side comes into contact with the cold source of cabinet 1 on the lower side that is in direct contact with the outside. Condensation occurs at the contact surface, and the condensed water falls onto the first moisture-absorbing element 7, thereby reducing the absolute humidity inside cabinet 1 and preventing condensation. Example 2, please refer to Figures 1-8 The parts that are the same as in Embodiment 1 will not be repeated here. The difference is that this embodiment can be applied to special weather, such as the "return of spring" phenomenon. When the outside humidity is high and there is slight heat accumulation inside the cabinet 1, the semiconductor cooling chip 15 works and the fan 13 works, blowing air upward. Under the action of internal circulation, the "hot air" on the upper side comes into contact with the cold surface 151 of the semiconductor cooling chip 15, and condensation occurs on the contact surface. The condensed water falls onto the first moisture-absorbing element 7, thereby reducing the absolute humidity inside the cabinet 1 and preventing condensation. Example 3, please refer to Figures 1-8 The parts that are the same as in Embodiment 1 will not be repeated here. The difference is that this embodiment can be applied to hot weather, where the temperature inside the cabinet is higher than that outside. The cam roller 71 is placed horizontally, the semiconductor cooling chip 15 is working, and the fan 13 is working, blowing air downwards. The hot air inside the cabinet is discharged through the lower cavity 103 and the outside of the cam roller 71. Under the action of external circulation, the outside air first passes through the cold surface 151 of the semiconductor cooling chip 15. After condensation and cooling occur at the contact surface, it enters the inside of the cabinet 1, thereby reducing the absolute humidity inside the cabinet 1 while achieving heat dissipation.

[0035] 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 condensation prevention structure for an outdoor power distribution cabinet, comprising a cabinet body (1) and an inner layer (101) on the inner side of the cabinet body (1), characterized in that: The cabinet (1) and the inner layer (101) are both fixedly connected to the partition (14) on the lower side and are interrupted by the partition (14). The upper side of the partition (14) is the upper cavity (102) and the lower side is the lower cavity (103). The inner side of the bottom end of the inner layer (101) is connected to the air duct (105), and the air duct (105) is rotatably equipped with a fan (13) on the inner side. An air vent (1011) is provided at the inner layer (101) on the lower side of the partition (14). The air vent (1011) is lower than the top of the air duct (105). A condensing dehumidification assembly is provided at the cabinet (1) on the lower side of the partition (14). The condensing dehumidification assembly includes a motor (6) and a semiconductor cooling chip (15) fixed inside the cabinet (1). A cam roller (71) is fixedly connected to the end of the main shaft of the motor (6). A first moisture-absorbing element (7) is fixedly connected to the outside of the cam roller (71). The first moisture-absorbing element (7) is located on the lower side of the semiconductor cooling chip (15). The two sides of the semiconductor cooling chip (15) are a hot surface (152) and a cold surface (151), respectively. The cold surface (151) faces the inside of the cabinet (1). Insulation strips (16) are fixedly connected to both the upper and lower sides of the semiconductor cooling chip (15). A heat-conducting sheet (1511) for increasing the cold source area is fixedly connected to one side of the cold surface (151). The rotation of the cam roller (71) enables internal or external circulation within the cabinet (1), thereby removing moisture while also facilitating heat dissipation of the cabinet (1). After the moisture condenses on the heat-conducting plate (1511) and the cold surface (15), it will fall down to the surface of the first moisture-absorbing element (7) and be transferred to the second moisture-absorbing element (8) on the hot surface (152) by capillary action as the cam roller (71) rotates, thus realizing the transfer of moisture between the cold surface (151) and the hot surface (152) and enabling the moisture to evaporate quickly after condensation. A fixed plate (11) is fixedly connected to the outside of the cabinet (1). A slide rod (12) is slidably connected to the inside of the fixed plate (11). A slide plate (10) is fixedly connected to the outside of the slide rod (12). A second moisture-absorbing element (8) is located between the lower side of the slide plate (10) and the outside of the slide rod (12). A spring is fixedly connected between the slide plate (10) and the fixed plate (11). The spring is located on the outside of the slide rod (12) to ensure that the second moisture-absorbing element (8) is in close contact with the first moisture-absorbing element (7) during the rotation of the cam roller (71). A pressure bead (121) is fixedly connected to the bottom end of the slide bar (12). The pressure bead (121) is embedded in the inner side of the first moisture-absorbing element (7). During the rotation of the cam roller (71), as the pressure bead (121) squeezes the first moisture-absorbing element (7) and the first moisture-absorbing element (7) and the second moisture-absorbing element (8) make interference contact, the squeezed water enters the inner side of the second moisture-absorbing element (8) under capillary action. Under the high temperature of the hot surface (152), it evaporates quickly and achieves circulation.

2. The condensation prevention structure for an outdoor power distribution cabinet according to claim 1, characterized in that: The cabinet (1) is hinged to the front end of the cabinet (2). When the cabinet door (2) is closed, it has a sealing effect with the cabinet (1). The bottom inner side of the inner layer (101) of the cabinet (1) is fixedly connected to the outlet pipe (104) for passing through the incoming and outgoing cables of the distribution cabinet. After the cables are passed through, the outlet pipe (104) is sealed with sealant to reduce the gas exchange between the cabinet (1) and the outside.

3. The condensation prevention structure for an outdoor power distribution cabinet according to claim 1, characterized in that: A temperature sensor (4) for obtaining the internal temperature of the cabinet (1) is fixedly connected to the upper side of the inner layer (101), and a humidity sensor (5) for obtaining the external humidity is fixedly connected to the top of the cabinet (1) and the bottom of the inner layer (101). When the outside temperature is lower than the inside temperature of the cabinet, the fan (13) blows air upwards, and the airflow in the middle of the cabinet (1) moves upwards. Under the action of the fan (13) intake, the airflow on both sides of the cabinet (1) descends and enters the inner side of the lower cavity (103) through the air outlet (1011), and flows back to the air inlet of the fan (13). During this process, because the upper part of the cabinet (1) is insulated through the double-layer hollow structure of the cabinet (1) and the inner layer (101), the lower cavity (103) is in direct contact with the highly thermally conductive cabinet (1). The cabinet (1) is made of metal and is more sensitive to changes in the outside temperature. The "high temperature" air in the upper part of the cabinet (1) enters the "low temperature" lower cavity (103) and condenses in the lower cavity (103), thereby reducing the absolute humidity.

4. The condensation prevention structure for an outdoor power distribution cabinet according to claim 1, characterized in that: In the initial state, the cam roller (71) is set vertically. At this time, the cam roller (71) has the maximum vertical height. The cam roller (71) completely blocks its position. When the fan (13) is working, it is in internal circulation.

5. The condensation prevention structure for an outdoor power distribution cabinet according to claim 1, characterized in that: After the cam roller (71) rotates 90°, gaps will appear at both the upper and lower positions of the cam roller (71). The upper gap will be blocked by the descending second moisture-absorbing element (8). Because there is an opening (9) at the bottom of the second moisture-absorbing element (8), an air inlet for air to enter the cabinet (1) is formed on the upper side of the cam roller (71). The gap on the lower side will become the air outlet of the cabinet (1). The fan (13) reverses and the lower part becomes the air outlet of the fan (13), thus realizing external circulation.

6. The condensation prevention structure for an outdoor power distribution cabinet according to claim 1, characterized in that: The inner layer (101) is made of heat-insulating material, which further enhances the heat-insulating effect and prevents condensation caused by temperature difference due to heat transfer stagnation. A moisture-absorbing layer (3) is fixedly connected to the inner side of the top of the inner layer (101) to prevent the liquid condensed in the upper part from dripping directly, thus playing the role of water storage and transition.

7. A method for preventing condensation in an outdoor power distribution cabinet, using the power distribution cabinet condensation prevention structure as described in claim 5, characterized in that, The method is as follows: Method 1: Because the cabinet (1) is a double-layer structure, it can play a good heat preservation effect, so that the temperature difference between the inner side (101) and the inside of the cabinet (1) is similar, thereby reducing the possibility of condensation. Method 2: Under low external temperature conditions, the temperature inside the cabinet (1) does not exceed the allowable range of the distribution cabinet. Because of the existence of tiny gaps in the cabinet (1), there is always airflow exchange between the inside and outside of the cabinet (1). When the relative humidity inside the cabinet (1) approaches 90%, the semiconductor cooling chip (15) does not work, the fan (13) works, and the air is blown upward. Under the action of internal circulation, the "hot air" on the upper side comes into contact with the cold source of the cabinet (1) on the lower side that is in direct contact with the outside. Condensation occurs on the contact surface, and the condensed water falls onto the first moisture-absorbing component (7), thereby reducing the absolute humidity inside the cabinet (1) and preventing condensation. Method 3: When the external humidity is high and there is slight heat accumulation inside the cabinet (1), the semiconductor cooling chip (15) works and the fan (13) works, blowing air upward. Under the action of internal circulation, the "hot air" on the upper side comes into contact with the cold surface (151) of the semiconductor cooling chip (15), and condensation occurs on the contact surface. The condensed water falls onto the first moisture-absorbing element (7), thereby reducing the absolute humidity inside the cabinet (1) and preventing condensation. Method 4: When the temperature inside the cabinet is high, the cam roller (71) is placed horizontally, the semiconductor cooling chip (15) is working, the fan (13) is working, and the air is blown downward. The hot air inside the cabinet is discharged through the lower cavity (103) and the outside of the cam roller (71). Under the action of external circulation, the outside air first passes through the cold surface (151) of the semiconductor cooling chip (15), and after condensation occurs at the contact surface, it enters the inside of the cabinet (1), thereby reducing the absolute humidity inside the cabinet (1) and achieving heat dissipation.

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