Control cabinet in an explosion-proof plant environment

Abstract

The application discloses an explosion-proof workshop environment control cabinet and relates to the field of control cabinet equipment.The control cabinet comprises a positive pressure cabinet body with a sealing design, a positive exhaust structure is arranged on the side wall of the cabinet body, the positive exhaust structure comprises an exhaust fan and a sealing box, the exhaust fan is used for actively exhausting the gas in the cabinet body to the sealing box, a gas pipe is arranged on the top of the sealing box, the gas pipe comprises a main gas pipe and branch gas pipes, the main gas pipe is connected to the cabinet body and is provided with a control valve thereon, the branch gas pipes are connected to a heat dissipation box, an exhaust pipe is arranged at the end of the heat dissipation box and is connected to the cabinet body, and an exhaust pipe connected to the outside is arranged at the bottom of the cabinet body.The application actively exhausts the gas by the exhaust fan and cooperates with the heat dissipation box for circulating cooling, so that the gas is returned to the cabinet body after being cooled, the positive pressure maintenance and the efficient heat dissipation are realized, the gas source energy consumption is greatly reduced through gas recycling, the multistage filtration of the electrostatic dust collecting plate and the filter cylinder is suitable for the high dust environment, and the control cabinet is particularly suitable for high-risk places such as ammunition assembly.

Description

Technical Field

[0001] This invention relates to the field of control cabinet equipment, specifically a control cabinet for use in explosion-proof workshop environments. Background Technology

[0002] In environments with explosive gases or dust, such as petrochemical, military ammunition, and powder metallurgy industries, the safety of electrical control equipment is paramount. Positive pressure control cabinets, a commonly used type of explosion-proof electrical equipment, maintain a higher internal pressure than the external pressure by introducing protective gas into the sealed cabinet, effectively preventing external gases or dust from entering and ensuring safe operation.

[0003] Existing positive pressure control cabinets are mainly divided into two types: positive pressure ventilation type and positive pressure compensation type. Neither of these can meet the needs of specific high-risk scenarios in practical applications. While positive pressure ventilation provides excellent heat dissipation through continuous gas replacement, it places extremely high demands on the air source. In workshops with extremely high dust concentrations, such as those used for ammunition assembly, the air source must be degreased, dust-free, and dehydrated. Continuous operation of a clean air source is costly and places a heavy load on the air supply system.

[0004] While positive pressure compensation saves on air supply, it relies on the airtightness of the cabinet to maintain pressure. This means that when high-power frequency converters or servo drives are installed inside the cabinet, heat cannot be effectively dissipated, causing heat to accumulate inside the cabinet, resulting in serious temperature rise problems and affecting the lifespan of electrical components.

[0005] In addition, in specific production environments, filtration devices are usually installed at the air inlet to prevent flammable and explosive dust from entering the cabinet. In high-concentration dust environments, the filter screen is prone to clogging, leading to poor air intake and failure of positive pressure. If dust penetrates the filter layer and enters the cabinet, it not only adheres to the heat sink and affects heat dissipation efficiency, but even trace amounts of chemical dust can cause combustion and explosion accidents under the action of hot surfaces. Summary of the Invention

[0006] The purpose of this invention is to provide a control cabinet for explosion-proof workshop environments to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a control cabinet for an explosion-proof workshop environment, comprising a cabinet body, wherein an active ventilation structure is provided on the side wall of the cabinet body, the active ventilation structure comprising an exhaust fan and a sealing box, wherein the exhaust fan can actively exhaust the gas inside the cabinet body, and the sealing box is fixedly installed on the side wall of the cabinet body; The top of the sealed box is equipped with an air pipe, which includes a main air pipe and branch air pipes. The main air pipe is connected to the cabinet body, and the branch air pipes are connected to the heat dissipation box. The heat dissipation box is equipped with an exhaust pipe at its end, which is connected to the cabinet body; The bottom of the cabinet is equipped with an air vent pipe, which is located inside the lower cabinet and connected to the outside.

[0008] Preferably, the cabinet is a sealed design and a positive pressure cabinet.

[0009] Preferably, the exhaust fan is fixedly installed inside the inner bracket by a bracket, and the inner bracket is fixedly connected to the sealing box.

[0010] Preferably, the exhaust fan is provided with an electrostatic dust collection plate on its outer side, and the electrostatic dust collection plate is fixedly installed in the sealed box by a pole.

[0011] Preferably, the main gas pipe is equipped with a control valve, and the opening degree of the control valve is negatively correlated with the internal temperature of the cabinet; When the temperature inside the cabinet is lower than the first set value, the control valve is in the open state, and the gas flows directly back to the cabinet through the main gas pipe. When the temperature inside the cabinet is higher than the second set value, the control valve opening decreases or closes, and the gas enters the heat dissipation box through the branch gas pipe for cooling and then flows back to the cabinet through the exhaust pipe.

[0012] Preferably, the air pipe is connected to an external air source via a three-way valve.

[0013] Preferably, the heat sink is provided with heat sink fins inside, and the heat sink fins are arranged at intervals.

[0014] Preferably, the branch air pipe is equipped with a filter cartridge.

[0015] Preferably, a booster fan is coaxially mounted on the exhaust fan, and an air collection shroud is provided between the booster fan and the exhaust fan. The air collection shroud is mounted on a sleeve, and the sleeve is connected to the booster fan.

[0016] Preferably, the mounting shaft of the booster fan is sealed to the sealing box and connected to an external motor.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention uses an exhaust fan to draw hot air from inside the cabinet into a sealed box, and then sends it to a heat dissipation box via a branch pipe. After heat exchange with the heat sink, the air is returned to the cabinet via the exhaust pipe. This method utilizes the flowing gas to remove heat from the heat sink without wasting a large amount of clean gas inside the cabinet, achieving efficient thermal management under low gas consumption conditions. 2. The present invention sets an electrostatic dust collection plate in the sealed box and a filter cartridge on the branch gas pipe, which can effectively intercept dust particles carried in the circulating gas, prevent dust from accumulating in the cabinet or adhering to the heat sink and affecting the heat dissipation efficiency, and at the same time prevent the chemical dust from causing combustion and explosion accidents under the action of hot surfaces. It is particularly suitable for dangerous places with high dust concentrations, such as ammunition assembly. 3. The present invention sets up heat sinks arranged vertically at intervals inside the heat sink, which increases the contact area between the gas and the heat sink and the heat exchange path, thereby improving the cooling efficiency; at the same time, the coaxial arrangement of the booster fan and the exhaust fan and the cooperation of the gas collection shroud enhance the driving force of gas circulation, further improving the heat dissipation effect. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure of the present invention; Figure 3 This is a schematic diagram of the structure of the invention and a diagram of the internal structure of the heat sink; Figure 4 This is a schematic diagram of the structure of the present invention.

[0019] In the diagram: 1—cabinet body; 11—lower cabinet body; 2—Active ventilation structure; 21—Exhaust fan; 211—Bracket; 212—Inner bracket; 22—Sealed box; 23—Electrostatic dust collection plate; 231—Upright pole; 25—Booster fan; 26—Gas collection hood; 27—Sleeve; 3—Trachea; 31—Main air tube; 311—Control valve; 32—Branch air tube; 321—Filter cartridge; 4—Heat sink; 41—Heat fins; 42—Exhaust pipe; 5—Air outlet pipe. Detailed Implementation

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

[0021] Please see Figures 1 to 4 This invention provides a technical solution: a control cabinet for an explosion-proof workshop environment, comprising a cabinet body 1. The cabinet body 1 is an entirely sealed design, a positive pressure cabinet. The cabinet body 1 can be formed by welding steel plates, with all joints sealed. A sealing strip is provided between the cabinet door and the cabinet body to ensure sufficient sealing performance and maintain internal positive pressure. After a protective gas, such as clean air or inert gas, is introduced into the cabinet body 1, the internal pressure is maintained higher than the external ambient pressure, thereby preventing external explosive gases or dust from entering the cabinet.

[0022] An active ventilation structure 2 is provided on the side wall of the cabinet 1. The active ventilation structure 2 includes an exhaust fan 21 and a sealed box 22. The exhaust fan 21 can actively exhaust the gas inside the cabinet 1, and the sealed box 22 is fixedly installed on the side wall of the cabinet 1. Specifically, the exhaust fan 21 is fixedly installed in the inner bracket 212 by a bracket 211, and the inner bracket 212 is fixedly connected to the sealed box 22. When the exhaust fan 21 is started, it draws the hot gas inside the cabinet 1 into the sealed box 22.

[0023] An electrostatic dust collection plate 23 is provided on the outer side of the exhaust fan 21, and the electrostatic dust collection plate 23 is fixedly installed in the sealed box 22 by a support rod 231. The electrostatic dust collection plate 23 is located downstream of the exhaust fan 21 in the air outlet direction, that is, the gas discharged from the exhaust fan 21 first passes through the electrostatic dust collection plate 23. The electrostatic dust collection plate 23 includes a discharge electrode and a dust collection electrode. After the discharge electrode is connected to a high-voltage power supply, it generates a corona discharge, which charges the dust particles in the passing gas. The charged dust particles are then adsorbed by the dust collection electrode under the action of the electric field force. The power supply for the electrostatic dust collection plate 23 can be taken from the power supply inside the cabinet 1, and supplied after step-up rectification. The power supply line needs to be sealed. The electrostatic dust collection plate 23 can be set as a detachable structure as needed for easy periodic cleaning and maintenance.

[0024] The top of the sealed box 22 is equipped with an air pipe 3. The air pipe 3 includes a main air pipe 31 and branch air pipes 32. The diameter of the main air pipe 31 is usually larger than that of the branch air pipes 32 to ensure that most of the gas can quickly return through the main air pipe 31. The main air pipe 31 is connected to the cabinet 1, and a control valve 311 is provided on the main air pipe 31. The control valve 311 is preferably a mechanical manual regulating valve or a mechanical automatic regulating valve, such as a ball valve, butterfly valve, or gate valve. The flow channel opening is adjusted by the mechanical movement of the valve core. It does not rely on electromagnetic force to drive, so there is no electromagnetic interference or circuit spark problem, and it is suitable for explosion-proof environments. The opening of the control valve 311 can be manually or automatically adjusted according to the temperature sensor signal inside the cabinet 1: when the temperature is low, the opening is increased to allow more gas to return directly; when the temperature is high, the opening is decreased to force more gas into the heat dissipation box 4 for cooling.

[0025] The air pipe 3 is connected to an external air source via a three-way valve. The three-way valve allows the invention to both replenish protective gas into the cabinet 1 via an external air source and circulate gas within the cabinet via the main air pipe 31 and branch air pipes 32. During normal operation, the external air source continuously or intermittently replenishes protective gas into the cabinet 1 through the three-way valve to maintain positive pressure. Simultaneously, the gas within the cabinet, driven by the exhaust fan 21, either flows back through the main air pipe 31 or enters the heat dissipation box 4 via the branch air pipe 32 for cooling before flowing back.

[0026] The heat dissipation box 4 is equipped with heat dissipation fins 41 arranged vertically at intervals. The heat dissipation box 4 is a metal box with good thermal conductivity, which can be made of extruded aluminum alloy or welded copper plate. The number, thickness, and spacing of the heat dissipation fins 41 can be designed according to actual heat dissipation requirements. Typically, the spacing between adjacent heat dissipation fins 41 is 5mm to 20mm, and the thickness of the heat dissipation fins 41 is 0.5mm to 3mm. The heat dissipation fins 41 can be integrally formed with the inner wall of the heat dissipation box 4, or they can be fixed to the inner wall of the heat dissipation box 4 by means of plug-in, welding, or bolt connection. The vertically spaced heat dissipation fins 41 form multiple parallel gas flow channels. When the gas flows through the heat dissipation fins 41, it fully exchanges heat with the surface of the heat dissipation fins 41, transferring heat to the heat dissipation fins 41, and then the heat dissipation fins 41 conduct to the outer wall of the heat dissipation box 4 and dissipate it into the surrounding environment. To further improve heat dissipation efficiency, heat dissipation fins can also be provided on the outer wall of the heat dissipation box 4 to increase the heat exchange area with the outside air.

[0027] The branch air pipe 32 is equipped with a filter cartridge 321. The filter cartridge 321 contains a filter element, which can be made of materials such as HEPA high-efficiency filter paper, activated carbon filter layer, or non-woven fabric filter layer. The filtration accuracy can be selected according to the requirements of the operating environment. In high-dust environments such as ammunition assembly, HEPA-grade high-efficiency filter elements are used. Both ends of the filter cartridge 321 are connected to the branch air pipe 32, and the connection can be a threaded connection or a quick-connect coupling for easy filter element replacement. The housing of the filter cartridge 321 is usually made of transparent material or has a transparent observation window, allowing operators to visually inspect the filter element for blockage and replace it promptly.

[0028] The heat dissipation box 4 is equipped with an exhaust pipe 42 at its end, which connects to the cabinet 1. Gas cooled by the heat sink 41 inside the heat dissipation box 4 is returned to the cabinet 1 through the exhaust pipe 42, achieving the recycling of protective gas. The exhaust pipe 42 can be connected to the cabinet 1 at the upper, middle, or lower part of the cabinet 1, depending on actual needs. It is preferably located at the upper part of the cabinet 1, allowing the cooled gas to enter from the top, utilizing the natural convection principle of cold air sinking and hot air rising to enhance the gas circulation effect within the cabinet.

[0029] The bottom of the cabinet 1 is equipped with a vent pipe 5, which is located inside the lower cabinet 11 and connected to the outside. The lower cabinet 11 is an independent chamber at the bottom of the cabinet 1, and the vent pipe 5 is located within it to provide dust protection. A one-way valve or a back pressure valve can be installed on the vent pipe 5 to ensure that exhaust is automatically opened only when the internal pressure of the cabinet 1 exceeds a set value. The outlet end of the vent pipe 5 can be connected to a safe discharge area or to a gas recovery device for further utilization.

[0030] A booster fan 25 is coaxially mounted on the exhaust fan 21. A gas collection hood 26 is provided between the booster fan 25 and the exhaust fan 21. The gas collection hood 26 is mounted on a sleeve 27, and the sleeve 27 is connected to the booster fan 25.

[0031] The booster fan 25 and the exhaust fan 21 are coaxially mounted, meaning they share the same shaft and are connected on the same axis. The blade diameter and blade angle of the booster fan 25 can be designed according to the required boost value. Typically, the blade diameter of the booster fan 25 is slightly smaller than that of the exhaust fan 21, but the rotation speed is the same, thereby achieving a higher gas pressure boost.

[0032] The gas collection shroud 26 is shaped like a trumpet or a cone, with its larger end near the exhaust fan 21's outlet and its smaller end connected to the booster fan 25's inlet. The function of the gas collection shroud 26 is to effectively collect the gas discharged from the exhaust fan 21, reducing gas diffusion and energy loss during flow, and transferring as much kinetic energy as possible from the exhaust fan 21 to the booster fan 25, thus improving energy utilization efficiency. The gas collection shroud 26 can be fixed to the sleeve 27 by welding or bolting. The sleeve 27 is fitted onto the connecting shaft between the exhaust fan 21 and the booster fan 25, serving a supporting and positioning function.

[0033] The mounting shaft of the booster fan 25 is sealed to the sealing housing 22 and connected to an external motor. The mounting shaft of the booster fan 25 passes through the wall of the sealing housing 22, and a sealing device is installed at the passage. The sealing device can be a mechanical seal, including components such as a rotating ring, a stationary ring, a spring, and a sealing ring. The rotating ring rotates with the shaft, and the stationary ring is fixed to the wall of the sealing housing 22. A sealing surface is formed between the rotating ring and the stationary ring, and the spring force keeps them in contact, achieving dynamic sealing of the rotating shaft. The sealing device can also be a magnetic seal, which achieves non-contact power transmission through magnetic coupling, completely eliminating the possibility of leakage and making it more suitable for explosion-proof environments.

[0034] The external motor is an explosion-proof motor, and its output shaft is connected to the mounting shaft of the booster fan 25 via a coupling, or driven by belt drive, gear drive, or other means. When belt drive is used, the belt and pulley should be located outside the sealed box 22 and a protective cover should be provided to ensure safety.

[0035] The booster fan 25 significantly enhances the driving force of gas flow throughout the entire circulation loop. Hot gas extracted from the cabinet 1 enters the gas collection hood 26 under the drive of the exhaust fan 21. After being collected by the gas collection hood 26, it enters the booster fan 25, where it undergoes secondary pressurization. This ensures the gas has sufficient pressure to overcome the flow resistance in subsequent flow channels, including the control valve 311, filter cartridge 321, heat sink 41 flow channels, and exhaust pipe 42, smoothly completing the entire circulation process. The booster fan 25 is particularly suitable for applications with long pipes, numerous bends, or high flow resistance within the heat sink 4, ensuring the adaptability of this invention under various installation conditions.

[0036] In this embodiment, the heat dissipation box 4 is located outside the cabinet 1 and is fixedly installed on the top of the cabinet 1. The heat dissipation box 4 is provided with an air inlet connected to a branch air pipe 32 and an exhaust port connected to an exhaust pipe 42. Gas enters from the side and exits from the bottom. The hot gas is driven to move by the booster fan 25 to prevent gas stagnation or backflow.

[0037] The heat sink 41 inside the heat sink 4 is divided into two groups, which are arranged alternately in the vertical direction, forming a meandering "S"-shaped gas flow channel. As the gas flows through this channel, it constantly changes its flow direction, colliding and contacting the surface of the heat sink 41 thoroughly, greatly enhancing the heat exchange effect. At the same time, the meandering channel prolongs the residence time of the gas inside the heat sink 4, allowing the gas more time to transfer heat to the heat sink 41.

[0038] The surface of the heat sink 41 can also be roughened or have tiny raised structures to increase the heat dissipation area and promote airflow turbulence, thereby further improving the convective heat transfer coefficient. Roughening can be achieved by methods such as sandblasting, chemical etching, or rolling.

[0039] In this embodiment, the control valve 311 is an electrically adjustable valve, and its actuator is an electric actuator. The electric actuator receives control signals from the control system and drives the valve core to move, thereby achieving precise adjustment of the opening degree of the main air pipe 31. The electric actuator is powered by an intrinsically safe power supply or an explosion-proof power supply to ensure safe use in explosion-proof environments.

[0040] The control system includes a temperature sensor and a pressure sensor. The temperature sensor is located inside the cabinet 1 to detect the temperature inside the cabinet; the pressure sensor is located inside the cabinet 1 to detect the pressure inside the cabinet. The signals from the temperature sensor and the pressure sensor are transmitted to the controller. The controller calculates based on preset temperature and pressure thresholds and outputs a control signal to the electric actuator of the control valve 311.

[0041] Specifically as follows: When the temperature inside the cabinet is lower than the first set temperature, the controller determines that the heat dissipation demand is low and controls the control valve 311 to open to the maximum, so that most of the extracted hot gas flows directly back to the cabinet 1 through the main gas pipe 31, reducing the amount of gas flowing through the heat dissipation box 4, reducing the heat dissipation load of the heat dissipation box 4, and saving energy.

[0042] When the temperature inside the cabinet rises to between the first and second set temperatures, the controller linearly adjusts the opening of the control valve 311 according to the temperature value. The higher the temperature, the smaller the opening of the control valve 311, forcing more gas into the heat sink 4 for cooling. The relationship between the opening of the control valve 311 and the temperature can be achieved using proportional control or proportional-integral control to achieve smooth regulation.

[0043] When the temperature inside the cabinet is higher than the second set temperature, the controller determines that the heat dissipation demand is high and controls the control valve 311 to open to the minimum, so that as much of the extracted hot gas as possible enters the heat dissipation box 4 for sufficient cooling and then flows back, thereby achieving maximum heat dissipation efficiency.

[0044] Work process: Initially, an external air source supplies protective gas into the cabinet 1 through the air pipe 3 and the three-way valve, raising the internal air pressure of the cabinet 1 to the set positive pressure value. Once the internal air pressure of the cabinet 1 reaches the set value, the three-way valve adjusts to maintain the air supply, and the control valve 311 is in the open state.

[0045] When the electrical components inside cabinet 1 generate a large amount of heat and the internal temperature rises above the set temperature, control valve 311 gradually reduces its opening under the action of the controller. Most of the gas extracted by exhaust fan 21 enters heat dissipation box 4 through branch pipe 32 for forced cooling.

[0046] The hot gas entering the heat sink 4 first undergoes secondary filtration through filter cartridge 321 to further remove any remaining dust and impurities, protecting the heat sink 41 from dust contamination. The filtered hot gas then enters the interior of the heat sink 4 and flows along the channels between the spaced heat sink 41s. During this flow, the hot gas exchanges heat thoroughly with the surface of the heat sink 41s, and the heat is conducted through the heat sink 41s to the outer wall of the heat sink 4, where it is carried away by the ambient air. For heat sinks 4 equipped with auxiliary cooling fans, the fans are simultaneously activated, forcing airflow over the heat sink fins on the outer wall of the heat sink 4, accelerating heat dissipation.

[0047] The cooled gas temperature drops significantly and is re-introduced into cabinet 1 via exhaust pipe 42 at the end of heat dissipation box 4. Upon entering cabinet 1, the cooled gas mixes with the hot air inside, lowering the overall temperature. Simultaneously, the cooling gas enters from the bottom or lower-middle part of cabinet 1, utilizing the natural convection effect of cold air sinking and hot air rising to promote overall gas circulation within the cabinet, resulting in a more uniform temperature distribution and preventing localized hot spots.

[0048] In embodiments equipped with a booster fan 25, the hot gas extracted by the exhaust fan 21 is collected by the gas collection hood 26 and enters the booster fan 25. The booster fan 25 pressurizes the gas and then sends it into the sealed box 22 for further processing. The additional driving force provided by the booster fan 25 ensures that the gas can still flow smoothly through the heat dissipation box 4 and return to the cabinet 1 even when the opening of the control valve 311 is reduced, ensuring the smooth flow of the circulation loop. When the pressure inside the cabinet 1 becomes too high due to gas circulation or external gas supply, the excess gas is discharged to the outside through the exhaust pipe 5 at the bottom of the cabinet 1, ensuring that the pressure inside the cabinet is maintained within the set positive pressure range.

[0049] During the above process, the opening degree of control valve 311 can be flexibly adjusted according to actual needs to achieve a balance between temperature control and energy consumption optimization. Specifically, when the temperature inside the cabinet is low, the system can appropriately increase the opening degree of control valve 311, allowing more hot gas to flow directly back into the cabinet through the main gas pipe 31, thereby reducing the amount of gas entering the heat dissipation box 4 and effectively reducing the energy consumption required for heat dissipation. Conversely, when the temperature inside the cabinet is high, the opening degree of control valve 311 can be appropriately reduced to guide more hot gas into the heat dissipation box 4 for sufficient cooling, thereby improving the overall heat dissipation efficiency and ensuring that the equipment operates stably within a suitable temperature range.

[0050] As is known from common technical knowledge, this invention can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative and not exhaustive. All modifications within the scope of this invention or its equivalents are included in this invention.

Claims

1. A control cabinet for use in explosion-proof workshop environments, characterized in that: Includes a cabinet (1), and an active ventilation structure (2) is provided on the side wall of the cabinet (1). The active ventilation structure (2) includes an exhaust fan (21) and a sealing box (22). The exhaust fan (21) can actively exhaust the gas inside the cabinet (1), and the sealing box (22) is fixedly installed on the side wall of the cabinet (1). The top of the sealed box (22) is provided with an air pipe (3), which includes a main air pipe (31) and a branch air pipe (32). The main air pipe (31) is connected to the cabinet (1), and the branch air pipe (32) is connected to the heat dissipation box (4). The heat dissipation box (4) is provided with an exhaust pipe (41) at its end, and the exhaust pipe (41) is connected to the cabinet (1); The bottom of the cabinet (1) is provided with an air vent (5), which is located inside the lower cabinet (11) and connected to the outside.

2. The control cabinet for an explosion-proof workshop environment according to claim 1, characterized in that: The cabinet (1) is a sealed design and a positive pressure cabinet.

3. The control cabinet for an explosion-proof workshop environment according to claim 1, characterized in that: The exhaust fan (21) is fixedly installed in the inner bracket (212) by the bracket (211), and the inner bracket (212) is fixedly connected to the sealing box (22).

4. The control cabinet for an explosion-proof workshop environment according to claim 1, characterized in that: An electrostatic dust collection plate (23) is provided on the outside of the exhaust fan (21), and the electrostatic integrated plate (23) is fixedly installed in the sealed box (22) by a pole (231).

5. The control cabinet for an explosion-proof workshop environment according to claim 1, characterized in that: The main air pipe (31) is equipped with a control valve (311), and the opening degree of the control valve (311) is negatively correlated with the internal temperature of the cabinet (1). When the temperature inside the cabinet is lower than the first set value, the control valve (311) is in the open state, and the gas flows directly back to the cabinet (1) through the main gas pipe (31). When the temperature inside the cabinet is higher than the second set value, the opening of the control valve (311) is reduced or closed, and the gas enters the heat dissipation box (4) through the branch gas pipe (32), is cooled, and then flows back to the cabinet (1) through the exhaust pipe (42).

6. The control cabinet for an explosion-proof workshop environment according to claim 1, characterized in that: The air pipe (3) is connected to an external air source via a three-way valve.

7. The control cabinet for an explosion-proof workshop environment according to claim 1, characterized in that: The heat sink (4) is equipped with heat sinks (41) inside, and the heat sinks (41) are arranged at intervals.

8. The control cabinet for an explosion-proof workshop environment according to claim 1, characterized in that: The branch trachea (32) is equipped with a filter cartridge (321).

9. The control cabinet for an explosion-proof workshop environment according to claim 1, characterized in that: A booster fan (25) is coaxially mounted on the exhaust fan (21). A gas collection hood (26) is provided between the booster fan (25) and the exhaust fan (21). The gas collection hood (26) is mounted on a sleeve (27), and the sleeve (27) is connected to the booster fan (25).

10. The control cabinet for an explosion-proof workshop environment according to claim 9, characterized in that: The mounting shaft of the booster fan (25) is sealed to the sealing box (22) and connected to an external motor.

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