Intelligent low-voltage power distribution cabinet with anti-condensation function and control method thereof

Abstract

The invention discloses an intelligent low-voltage power distribution cabinet with an anti-condensation function and a control method thereof, relates to the technical field of power distribution cabinets, solves the problem of condensation of the power distribution cabinet in a seasonal environment with large day and night temperature difference, and comprises a cabinet body, a mounting plate, an induction dehumidification structure, a temperature control structure and a control module. The induction dehumidification structure comprises a semiconductor dehumidification module, a temperature and humidity sensor, an air inlet fan and an air outlet fan. The semiconductor dehumidification module is obliquely arranged in the dehumidification air channel below the mounting plate, the cold end face of the semiconductor dehumidification module right faces inlet air flow, the hot end face of the semiconductor dehumidification module is externally connected with a cooling fan, and a condensate water collecting box is arranged below the semiconductor dehumidification module. The temperature control structure comprises a constant-temperature heating module and a temperature measuring assembly. The control module monitors the environment in the cabinet in real time, when the condensation risk is detected, the semiconductor dehumidification module is started to reduce the absolute humidity of air, the constant-temperature heating module, the air inlet fan and the air outlet fan are coordinated to operate, and the anti-condensation cabinet has the advantages of being good in anti-condensation effect, low in energy consumption and reliable in operation.

Description

Technical Field

[0001] The present application relates to the technical field of power distribution cabinets, and in particular to an intelligent low-voltage power distribution cabinet with an anti-condensation function and a control method thereof. Background Art

[0002] Low-voltage distribution cabinets (LVDCs) are critical equipment used in a wide range of industrial and residential applications within power distribution systems. However, in environments with significant seasonal temperature swings between day and night, drastic temperature fluctuations can easily lead to dew point temperatures in LVDCs, causing condensation on the surfaces of electrical components within the cabinets. This condensation accumulation not only accelerates corrosion of metal components and degrades insulation performance, but can also pose safety risks such as short circuits and electrical creepage.

[0003] Currently, existing low-voltage distribution cabinets mostly use passive anti-condensation measures, such as natural ventilation, electric heating, and desiccant dehumidification. These measures mostly rely on environmental changes or physical adsorption and cannot actively reduce absolute humidity. They are only suitable for use in ordinary environments and cannot effectively solve the condensation problem of distribution cabinets in environments with large seasonal day and night temperature differences. Summary of the Invention

[0004] In this regard, the present application aims to provide an intelligent low-voltage distribution cabinet with anti-condensation function and a control method thereof. By setting an induction dehumidification structure and a temperature control structure in the distribution cabinet, the condensation problem of the distribution cabinet in an environment with large seasonal temperature difference between day and night can be effectively improved, thereby ensuring the safe operation of the distribution cabinet.

[0005] The present application provides an intelligent low-voltage power distribution cabinet with anti-condensation function and a control method thereof, which adopts the following technical solutions: An intelligent low-voltage power distribution cabinet with an anti-condensation function, comprising a cabinet body, a mounting plate for mounting electrical components, and an induction dehumidification structure, a temperature control structure, and a control module electrically connected to each other. Wherein, the inductive dehumidification structure includes a semiconductor dehumidification module, a temperature and humidity sensor arranged in the cabinet, an air inlet fan and an air outlet fan arranged on different side walls of the cabinet, and the air outlet fan is located above the air inlet fan; the cabinet is provided with a concave partition located below the mounting plate, the concave partition is separated by an exhaust port, the concave partition and the bottom of the cabinet form a dehumidification air duct, and the air inlet fan is located in the dehumidification air duct; the semiconductor dehumidification module is arranged obliquely in the dehumidification air duct, the cold end face of the semiconductor dehumidification module is facing the air flow direction of the air inlet fan, and its hot end face faces the outside of the cabinet and is connected to the heat dissipation fan; a condensed water collection box is provided below the semiconductor dehumidification module; The temperature control structure includes a constant temperature heating module embedded in the mounting plate near the dehumidification structure and a temperature measuring component arranged in the cabinet. The control module controls the semiconductor dehumidification module to reduce the absolute humidity of the air, and at the same time coordinates the control of the air inlet fan, air outlet fan and constant temperature heating module.

[0006] Preferably, the condensate collection box is provided with a drain pipe, the other end of the drain pipe is connected to the outside of the cabinet, the drain pipe is provided with a water pump electrically connected to the control module, the mounting plate is connected to a heat conducting plate at the heat-generating electrical component, the drain pipe is laid in contact with the heat conducting plate, the contact surface between the drain pipe and the heat conducting plate is filled with high thermal conductivity silicone grease, and the drain pipe is wrapped with insulation material; the contact surface between the heat conducting plate and the mounting plate is provided with a temperature sensor, and when the temperature exceeds the set threshold, the control module starts the water pump to accelerate the circulation of condensate to assist in heat dissipation.

[0007] Preferably, the temperature measurement component includes three temperature sensors, and the three temperature sensors are distributed in the upper, middle and lower areas of the cabinet.

[0008] Preferably, the temperature control structure also includes a two-way vent arranged on the side wall of the cabinet, and a filter and an electric damper are provided in the two-way vent, and the electric damper is controlled to open and close by a controller; the air inlet fan and the air outlet fan are respectively located in the cabinet near the two-way vent.

[0009] Preferably, the control module includes: Dew point calculation module, which calculates the current dew point temperature based on temperature and humidity data based on the Antoine equation; The mode switching module starts the semiconductor dehumidification module when the temperature inside the cabinet is lower than the dew point temperature, and activates the constant temperature heating module when the surface temperature of the electrical components is close to the dew point temperature.

[0010] A control method for an intelligent low-voltage distribution cabinet with an anti-condensation function comprises the following steps: S1. Use a temperature and humidity sensor group to collect temperature and humidity data from multiple areas within the cabinet. S2. The control module calculates the current dew point temperature and humidity gradient distribution; S3. When humidity saturation is detected in any area, the semiconductor dehumidification module is activated until the absolute humidity drops to a safe threshold; S4. When the difference between the surface temperature of the electrical component and the dew point temperature is ≤1°C, the constant temperature heating module is triggered to perform local temperature control.

[0011] Preferably, in step S3, the working power of the semiconductor dehumidification module is directly proportional to the degree of humidity exceeding the standard, and the temperature difference between the inside and outside of the cabinet is monitored in real time during the dehumidification process, and the cooling power is automatically reduced when the temperature difference is ≥15°C.

[0012] Preferably, in step S4, the constant temperature heating module adopts a pulse heating method, the heating cycle is synchronized with the sampling frequency of the temperature and humidity sensor, and the heating time t in each cycle satisfies: t=Kp*ΔT+Ki*∫ΔTdt Among them, ΔT is the difference between the dew point temperature and the actual temperature, and Kp and Ki are PID control parameters.

[0013] In summary, this application has at least one of the following beneficial effects: This application actively reduces the absolute humidity inside the cabinet through a semiconductor dehumidification module, and combines the dynamic calculation of the dew point based on the Antoine equation and the local temperature control of the constant temperature heating module to eliminate the condensation conditions from the root. Compared with traditional passive methods (such as electric heating or desiccant), it can effectively improve the condensation problem of the distribution cabinet in an environment with large seasonal day and night temperature differences, ensuring the safe operation of the distribution cabinet.

[0014] Utilize condensed water circulation to dissipate heat. The condensed water generated by the semiconductor dehumidification module is circulated to the heat conduction plate through the drainage pipe. The water flow is used to assist in heat dissipation. The condensed water is then distributed out of the cabinet to achieve waste heat recovery and reduce additional heat dissipation energy consumption. The dehumidification air duct formed by the concave partition and the cabinet body, and the upper and lower air inlet and outlet fans, forced air circulation ensures uniform humidity control. In addition, the use of two-way vents to intelligently switch between natural ventilation and forced dehumidification modes can better improve the condensation problem caused by large temperature differences. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the cabinet structure of this embodiment of the present application; Figure 2 is a side view schematic diagram of the mounting plate, the insulation plate and the drain pipe of this embodiment of the present application; Figure 3 This is a schematic diagram of the back of the mounting plate, insulation board and drain pipe of this embodiment of the present application.

[0016] Explanation of the accompanying symbols: 1. Cabinet; 101. Mounting plate; 2. Induction dehumidification structure; 21. Semiconductor dehumidification module; 3. Temperature control structure; 4. Air inlet fan; 5. Air outlet fan; 6. Concave partition; 61. Exhaust port; 7. Dehumidification air duct; 71. Filter screen block; 8. Cooling fan; 81. Air guide hood; 9. Condensate collection box; 10. Drain pipe; 11. Heat conduction plate; 12. Constant temperature heating module; 13. Two-way vent; 131. Filter; 132. Electric damper. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0018] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0019] In this application, terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "center," "vertical," "horizontal," "inclined," and "longitudinal" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe this application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.

[0020] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0021] Additionally, the term "plurality" shall mean two or more.

[0022] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] The present invention discloses an intelligent low-voltage power distribution cabinet with an anti-condensation function, comprising a cabinet 1. A mounting plate 101 is provided within the cabinet 1 for mounting electrical components. The cabinet 1 also includes an electrically interconnected induction dehumidification structure 2, a temperature control structure 3, and a control module. The control module adjusts the induction dehumidification structure 2 and the temperature control structure 3 according to temperature and humidity fluctuations within the cabinet 1, thereby improving condensation in environments with large seasonal daytime and nighttime temperature differences and ensuring safe operation of the cabinet.

[0024] Specifically, the inductive dehumidification structure 2 includes a semiconductor dehumidification module 21 located below the mounting plate 101, a temperature and humidity sensor installed in the cabinet 1, and an air inlet fan 4 and an air outlet fan 5 installed on different side walls in the cabinet 1. Among them, the air outlet fan 5 is located above the air inlet fan 4. The cabinet 1 is sealed with a concave partition 6 located below the mounting plate 101, and the concave partition 6 and the bottom of the cabinet 1 form a dehumidification duct 7. The air inlet fan 4 is located in the dehumidification duct 7 and is used to discharge external air; the dehumidification duct 7 is provided with a filter screen block 71 (breathable type) between the air inlet fan 4 and the semiconductor dehumidification module 21. The concave partition 6 is spaced apart with exhaust ports 61 to discharge the dehumidified cold air into the cabinet 1 to take away excess heat (i.e., heat dissipation).

[0025] Furthermore, the semiconductor dehumidification module 21 is arranged obliquely in the dehumidification air duct 7. The cold end face of the semiconductor dehumidification module 21 is directly opposite the airflow direction of the air inlet fan 4, and its hot end face faces the outside of the cabinet 1 and is connected to the heat dissipation fan 8. The heat dissipation fan 8 is located outside the cabinet 1, and a guide air cover 81 is provided between the hot end face of the semiconductor dehumidification module 21 and the heat dissipation fan 8 to ensure that the heat dissipation airflow is discharged out of the cabinet in one direction.

[0026] Furthermore, a condensate collection tank 9 is located below the semiconductor dehumidification module 21 to collect condensate for centralized processing. A drain pipe 10 is connected to the bottom of the condensate collection tank 9, the other end of which is connected to the exterior of the cabinet 1. A water pump electrically connected to the control module is installed in the drain pipe 10. Heat-prone electrical components (such as transformers and resistors) are placed on the mounting plate 101 near the bottom of the cabinet 1. When using cold air for heat dissipation, this effectively dissipates heat through natural convection by utilizing the rising heat. A heat conducting plate 11 is attached to the mounting plate 101 near the heat-prone electrical components, and the drain pipe 10 is laid against the heat conducting plate 11. The contact surface between the drain pipe 10 and the heat conducting plate 11 is filled with highly thermally conductive silicone grease, and the drain pipe 10 is wrapped with insulating material. A temperature sensor is installed on the contact surface between the heat conducting plate 11 and the mounting plate 101. When the temperature exceeds a set threshold, the control module activates the water pump to accelerate the circulation of the condensate to assist in heat dissipation.

[0027] In addition, the temperature control structure 3 includes a constant temperature heating module 12 embedded in the mounting plate 101 near the concave partition 6, and a temperature measuring component arranged in the cabinet 1. The control module controls the semiconductor dehumidification module 21 to reduce the absolute humidity of the air, and at the same time coordinates the control of the air inlet fan 4, the air outlet fan 5 and the constant temperature heating module 12.

[0028] Furthermore, the temperature control structure 3 includes a two-way vent 13 located on the side wall of the cabinet 1. The two-way vent 13 is equipped with a filter 131 and an electric damper 132 (e.g., an electric shutter damper, whose blades are driven by a motor to open and close). The electric damper 132 is controlled by a controller. The air inlet fan 4 and the air outlet fan 5 are located in the cabinet 1 near the two-way vent 13.

[0029] Furthermore, the temperature measurement component includes three temperature sensors, and the three temperature sensors are distributed in the upper, middle and lower areas of the cabinet 1.

[0030] The control module further includes a dew point calculation module and a mode switching module. The dew point calculation module calculates the current dew point temperature based on temperature and humidity data using the Antoine equation. When the temperature inside the cabinet 1 falls below the dew point, the semiconductor dehumidification module 21 is activated. When the surface temperature of the electrical components approaches the dew point, the constant temperature heating module 12 is activated.

[0031] A control method for an intelligent low-voltage distribution cabinet with an anti-condensation function comprises the following steps: S1. Collect temperature and humidity data from multiple areas within cabinet 1 using a temperature and humidity sensor group.

[0032] S2. The control module calculates the current dew point temperature and humidity gradient distribution.

[0033] S3. When it is detected that the humidity in any area is saturated, the semiconductor dehumidification module 21 is activated until the absolute humidity drops to a safe threshold.

[0034] S4. When the difference between the surface temperature of the electrical component and the dew point temperature is ≤1°C, the constant temperature heating module 12 is triggered to perform local temperature control.

[0035] Furthermore, in step S3, the working power of the semiconductor dehumidification module 21 is directly proportional to the degree of humidity exceeding the standard, and the temperature difference between the inside and outside of the cabinet 1 is monitored in real time during the dehumidification process. When the temperature difference is ≥15°C, the cooling power is automatically reduced.

[0036] Furthermore, in step S4, the constant temperature heating module 12 adopts a pulse heating method, the heating cycle is synchronized with the sampling frequency of the temperature and humidity sensor, and the heating time t in each cycle satisfies: t=Kp*ΔT+Ki*∫ΔTdt Among them, ΔT is the difference between the dew point temperature and the actual temperature, and Kp and Ki are PID control parameters.

[0037] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An intelligent low-voltage power distribution cabinet with an anti-condensation function, comprising a cabinet body (1), characterized in that: The cabinet (1) is provided with a mounting plate (101) for mounting electrical components, and the cabinet (1) is provided with an induction dehumidification structure (2), a temperature control structure (3), and a control module that are electrically connected to each other; The inductive dehumidification structure (2) comprises a semiconductor dehumidification module (21), a temperature and humidity sensor arranged in the cabinet (1), an air inlet fan (4) and an air outlet fan (5) arranged on different side walls of the cabinet (1), wherein the air outlet fan (5) is located above the air inlet fan (4); the cabinet (1) is provided with a concave partition (6) located below the mounting plate (101), the concave partition (6) is provided with an exhaust port (61) at intervals, the concave partition (6) and the bottom of the cabinet (1) form a dehumidification air duct (7), and the air inlet fan (4) is located in the dehumidification air duct (7); the semiconductor dehumidification module (21) is arranged obliquely in the dehumidification air duct (7), the cold end face of the semiconductor dehumidification module (21) is opposite to the air flow direction of the air inlet fan (4), and the hot end face thereof faces the outside of the cabinet (1) and is connected to a heat dissipation fan (8); a condensed water collection box (9) is provided below the semiconductor dehumidification module (21); The temperature control structure (3) includes a constant temperature heating module (12) embedded in the mounting plate (101) near the dehumidification structure, and a temperature measuring component arranged in the cabinet (1). The control module controls the semiconductor dehumidification module (21) to reduce the absolute humidity of the air, and coordinates and controls the operation of the air inlet fan (4), the air outlet fan (5) and the constant temperature heating module (12).

2. The intelligent low-voltage power distribution cabinet with anti-condensation function according to claim 1, characterized in that: The condensed water collection box (9) is provided with a drain pipe (10), the other end of the drain pipe (10) is connected to the outside of the cabinet (1), the drain pipe (10) is provided with a water pump electrically connected to the control module, the mounting plate (101) is connected to a heat-conducting plate (11) at a location of the heat-generating electrical component, the drain pipe (10) is laid in contact with the heat-conducting plate (11), the contact surface between the drain pipe (10) and the heat-conducting plate (11) is filled with high thermal conductivity silicone grease, and the drain pipe (10) is wrapped with an insulating material; the contact surface between the heat-conducting plate (11) and the mounting plate (101) is provided with a temperature sensor, and when the temperature exceeds a set threshold, the control module starts the water pump to accelerate the circulation of the condensed water to assist in heat dissipation.

3. The intelligent low-voltage power distribution cabinet with anti-condensation function according to claim 1, characterized in that: The temperature measurement component comprises three temperature sensors, and the three temperature sensors are distributed in the upper, middle and lower areas of the cabinet (1).

4. The intelligent low-voltage power distribution cabinet with anti-condensation function according to claim 1, characterized in that: The temperature control structure (3) further comprises a two-way vent (13) provided on a side wall of the cabinet (1), wherein a filter (131) and an electric damper (132) are provided in the two-way vent (13), and the electric damper (132) is controlled to open and close by a controller; the air inlet fan (4) and the air outlet fan (5) are respectively located on the cabinet (1) near the two-way vent (13).

5. The intelligent low-voltage power distribution cabinet with anti-condensation function according to claim 1, characterized in that: The control module includes: Dew point calculation module, which calculates the current dew point temperature based on temperature and humidity data based on the Antoine equation; The mode switching module starts the semiconductor dehumidification module (21) when the temperature in the cabinet (1) is lower than the dew point temperature, and activates the constant temperature heating module (12) when the surface temperature of the electrical component is close to the dew point temperature.

6. A control method for an intelligent low-voltage distribution cabinet with anti-condensation function according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. Collect temperature and humidity data of multiple areas in the cabinet (1) through the temperature and humidity sensor group; S2. The control module calculates the current dew point temperature and humidity gradient distribution; S3. When it is detected that the humidity in any area is saturated, the semiconductor dehumidification module (21) is started until the absolute humidity drops to a safe threshold; S4. When the difference between the surface temperature of the electrical component and the dew point temperature is ≤1°C, the constant temperature heating module (12) is triggered to perform local temperature control.

7. The control method of the intelligent low-voltage power distribution cabinet with anti-condensation function according to claim 6, characterized in that: In step S3, the operating power of the semiconductor dehumidification module (21) is directly proportional to the degree of humidity exceeding the standard, and the temperature difference between the inside and outside of the cabinet (1) is monitored in real time during the dehumidification process. When the temperature difference is ≥15°C, the cooling power is automatically reduced.

8. The control method of the intelligent low-voltage power distribution cabinet with anti-condensation function according to claim 6, characterized in that: In step S4, the constant temperature heating module (12) adopts a pulse heating method, the heating cycle is synchronized with the sampling frequency of the temperature and humidity sensor, and the heating time t in each cycle satisfies: t=Kp*ΔT+Ki*∫ΔTdt Among them, ΔT is the difference between the dew point temperature and the actual temperature, and Kp and Ki are PID control parameters.

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