Explosion-proof isolation and ventilation temperature control system for dust removal room electric control cabinet and control method

Abstract

The invention discloses an anti-explosion isolation and ventilation temperature control system for an electric control cabinet of a dust removal room and a control method, and belongs to the technical field of anti-explosion and heat management of electrical equipment. The system comprises an explosion-proof chamber which is an independent closed space and is internally provided with an electric control cabinet to realize physical isolation from a flammable and explosive environment in a dust removal room; the air inlet pipe is arranged on the side wall of the explosion-proof chamber, the air inlet end communicates with the outside, and the air outlet is formed in the explosion-proof chamber and close to the bottom; the exhaust fan is arranged at the top of the explosion-proof chamber, is communicated with the part, close to the top, in the explosion-proof chamber through a connecting air pipe and forms a bottom-to-top air convection channel with the air inlet pipe; the temperature sensor is arranged in the explosion-proof chamber; and the controller is electrically connected with the temperature sensor and the exhaust fan and controls the exhaust fan to operate according to the monitored temperature. The technical problem that explosion prevention and heat dissipation cannot be considered at the same time in the prior art is solved, heat dissipation according to needs is achieved, energy is saved, consumption is reduced, and long-term stable operation of electrical elements in the electric control cabinet is guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of electrical equipment explosion-proof and thermal management technology, specifically relating to an explosion-proof isolation and ventilation temperature control system and control method for an electrical control cabinet in a dust removal room. Background Technology

[0002] In the cigarette manufacturing industry, dust removal systems are core infrastructure for ensuring a clean production environment and achieving environmentally compliant emissions. Their operational stability directly determines the continuity, safety, and environmental compliance of the cigarette manufacturing process. The electrical control cabinet, as the core control unit of the dust removal system, integrates various key electrical control components such as frequency converters and controllers. Its stable and reliable operation is a prerequisite for precise control and efficient operation of the dust removal equipment, and is also a crucial support for ensuring safe production in the cigarette manufacturing workshop.

[0003] In actual production, the dust concentration and ambient temperature in the dust removal room of the silk-making workshop are high, and there are also risks of flammability and explosion. Traditional dust removal systems often have their electrical control cabinets directly installed inside the dust removal room, sharing the same space with the dust removal equipment. While this arrangement is simple to install and maintain, it fails to meet fire and explosion safety regulations. The electrical sparks generated during the operation of electrical components and their high-temperature surfaces can easily ignite dust, posing a significant safety hazard and seriously threatening the lives of personnel and the safety of equipment and property.

[0004] To meet fire and explosion safety requirements, there are currently two main approaches to addressing the layout relationship between dust removal rooms and electrical control cabinets.

[0005] The first approach is to continue the traditional layout, keeping the electrical control cabinet inside the dust removal room and operating it in the same space as the dust removal equipment. Only a simple cooling fan or external cooling device is added to the outside of the control cabinet, attempting to maintain equipment operation through localized cooling. While this method is simple to implement, the control cabinet still shares the same space with a flammable and explosive environment. Electrical sparks and high-temperature surfaces generated during operation are directly exposed to the dust environment, greatly increasing the risk of fire or explosion, and the safety risks cannot be fundamentally eliminated. Furthermore, the already high temperature inside the dust removal room, combined with the heat generated by the control cabinet itself, creates a double heat effect. External cooling devices, limited by localized cooling methods, have low heat exchange efficiency, making it difficult to effectively control the temperature inside the cabinet within a safe range. This leads to frequent malfunctions such as inverter burnout and equipment shutdowns caused by high temperatures. Therefore, this method only alleviates the heat dissipation problem but does not solve the safety risks; it is a stopgap measure that only addresses the symptoms, not the root cause.

[0006] The second approach is to move the electrical control cabinet out of the dust removal room and physically isolate it using a closed space or sealed cabinet to separate it from the flammable and explosive environment inside the dust removal room. While this method reduces safety risks through spatial separation, the isolation structure itself introduces new technical problems: to ensure explosion-proof performance, the isolation space must be a sealed or semi-sealed structure. This directly leads to the ineffective dissipation of heat generated by the electrical control cabinet during operation, resulting in persistently high internal temperatures. Critical components such as the frequency converter operate under high temperatures for extended periods, making them highly susceptible to overheating alarms, shutdowns, burnouts, or even explosions. Forcibly adding cooling devices to lower the temperature would compromise the airtightness of the isolation space, weakening its explosion-proof capabilities and introducing new safety risks.

[0007] In summary, both existing technical approaches have inherent defects. They either fail to meet fire and explosion safety requirements or cause serious heat dissipation problems after isolation is achieved, making it difficult to simultaneously ensure explosion safety and the heat dissipation stability of electrical equipment.

[0008] This application is submitted to address the aforementioned issues. Summary of the Invention

[0009] To address the shortcomings of existing technologies, the present invention aims to provide an explosion-proof isolation and ventilation temperature control system and method for electrical control cabinets in dust removal rooms. This solves the core technical challenge of simultaneously achieving explosion-proof safety and efficient heat dissipation in existing dust removal room electrical control cabinets, overcoming the inherent defects of the two existing technical approaches: the first approach involves placing the electrical control cabinet and the dust removal room in the same space, resulting in significant safety risks and poor heat dissipation; the second approach, with simple isolation, presents a contradiction between airtightness and heat dissipation, leading to high energy consumption and poor environmental adaptability. The present invention aims to achieve reliable physical isolation between the electrical control cabinet and the flammable and explosive environment of the dust removal room, while simultaneously achieving efficient, energy-saving, and intelligent ventilation and temperature control. This ensures the long-term stable operation of electrical components within the control cabinet, meets industrial explosion-proof safety standards and green operation and maintenance requirements, and guarantees the continuity and safety of the silk production process.

[0010] The technical solution adopted in this invention is as follows:

[0011] The first aspect of this invention provides an explosion-proof isolation and ventilation temperature control system for an electrical control cabinet in a dust removal room, comprising:

[0012] Explosion-proof room 2 is located on the ground 1. The explosion-proof room 2 is an independent and enclosed space. An electrical control cabinet 3 is installed inside the room to physically isolate the electrical control cabinet 3 from the flammable and explosive environment in the dust removal room.

[0013] An air inlet duct 6 is installed on the side wall of the explosion-proof chamber 2. Its air inlet end is connected to the outside, and its air outlet is located inside the explosion-proof chamber 2 near the bottom, for introducing outdoor air from the bottom.

[0014] The exhaust fan 11 is installed at the top of the explosion-proof room 2. Its air inlet is connected to the interior of the explosion-proof room 2 near the top through the connecting air duct 12, and its air outlet is connected to the outside. It is used to exhaust hot air from the top and form an air convection channel from bottom to top with the air inlet duct 6.

[0015] A temperature sensor is installed inside explosion-proof room 2 to monitor the indoor temperature in real time;

[0016] The controller is electrically connected to the temperature sensor and the exhaust fan 11 and is used to control the operating status of the exhaust fan 11 according to the monitored temperature.

[0017] Preferably, there are multiple electrical control cabinets 3, which are arranged at intervals along the length of the explosion-proof room 2; the air inlet end of the air inlet pipe 6 passes through the opening in the side wall of the explosion-proof room 2 and connects to the outside; the air inlet pipe 6 extends along the length of the explosion-proof room 2 and is suspended inside the explosion-proof room 2; the bottom of the air inlet pipe 6 is provided with multiple air inlets 7 corresponding to the positions of each electrical control cabinet 3, and each air inlet 7 is provided with a dustproof mesh plate.

[0018] Preferably, the exhaust fan 11 is fixedly installed on the top of the explosion-proof room 2 via the exhaust fan mounting base 10. One end of the connecting duct 12 is fixedly connected to and communicates with the exhaust end of the exhaust fan 11. The other end of the connecting duct 12 passes through the top of the explosion-proof room 2 and extends into its interior. The end of the connecting duct 12 located inside the explosion-proof room 2 is provided with a hot air exhaust outlet 13. The hot air exhaust outlet 13 is located inside the explosion-proof room 2 near the top, and a dustproof mesh is provided at the bottom of the hot air exhaust outlet 13.

[0019] Preferably, it also includes multiple sets of hangers 9 and mounting steel frames 8; the top of each set of hangers 9 is fixedly installed on the inner wall of the top of the explosion-proof chamber 2, and a mounting steel frame 8 is fixedly installed at the bottom of each set of hangers 9, forming a support structure for supporting the air inlet pipe 6; the air inlet pipe 6 is placed on the support structure.

[0020] Preferably, a doorway is provided on the side wall of the explosion-proof chamber 2, and an explosion-proof chamber door 4 is movably installed at the doorway; a plurality of observation windows 5 are provided on the side wall of the explosion-proof chamber 2 at intervals along its length outside the doorway, and explosion-proof glass is fixedly installed on the inner wall of each observation window 5.

[0021] Preferably, the exhaust end of the exhaust fan 11 is located on its side wall, and the connecting duct 12 is curved, extending from the exhaust end of the exhaust fan 11 to the top of the explosion-proof room 2 and passing through it, forming an angle transition from the side interface to the vertically downward pipe.

[0022] Preferably, the hot air outlet 13 is funnel-shaped, with its diameter gradually increasing from top to bottom.

[0023] Preferably, the air inlet duct 6 is suspended inside the explosion-proof room 2 by the hanger 9 and the mounting steel frame 8, and is located on one side of the electrical control cabinet 3; the air inlet 7 is opened on the side wall of the air inlet duct 6 and faces the waist of the electrical control cabinet, and is used to blow outdoor air towards the electrical control cabinet 3.

[0024] Preferably, it further includes an explosion-proof safety structure, the explosion-proof safety structure comprising:

[0025] An explosion-proof flame arrester installed at the connection between the connecting duct 12 and the explosion-proof room 2 is used to block the spread of explosion flames while ensuring ventilation.

[0026] And anti-static wires, which are respectively connected across the air inlet pipe 6, the connecting air pipe 12 and the explosion-proof chamber 2.

[0027] A second aspect of the present invention provides an explosion-proof isolation and ventilation temperature control method for an electrical control cabinet in a dust removal room, applied to the system described in the first aspect, comprising the following steps:

[0028] S1: Outdoor air is introduced through the air inlet pipe 6 located at the bottom of the explosion-proof chamber 2, and the outdoor air enters the explosion-proof chamber 2 from the bottom;

[0029] S2: The internal hot air is discharged from the top by the exhaust fan 11 located at the top of the explosion-proof room 2, forming a convection channel from bottom to top with the air inlet pipe 6;

[0030] S3: The temperature inside the explosion-proof chamber 2 is collected in real time by a temperature sensor, and the temperature signal is transmitted to the controller;

[0031] S4: The controller presets a first temperature threshold and a second temperature threshold, wherein the second temperature threshold is higher than the first temperature threshold;

[0032] S5: The controller compares the real-time temperature with the first temperature threshold and the second temperature threshold sequentially.

[0033] When the real-time temperature is lower than the first temperature threshold, control the exhaust fan 11 to shut down or run at low speed.

[0034] When the real-time temperature is greater than or equal to the first temperature threshold and lower than the second temperature threshold, control the exhaust fan 11 to start and run at medium speed.

[0035] When the real-time temperature is greater than or equal to the second temperature threshold, control the exhaust fan 11 to switch to high-speed operation.

[0036] The advantages of this invention over the prior art are as follows:

[0037] 1. This invention, by setting up an independent explosion-proof chamber, reliably physically isolates the electrical control cabinet from the flammable and explosive environment within the dust removal room, fundamentally eliminating the safety hazard of electrical sparks igniting dust and meeting fire and explosion protection standards. Simultaneously, through a scientific airflow organization with bottom intake and top exhaust, an upward air convection channel is formed within the explosion-proof chamber, effectively solving the heat dissipation problem in confined spaces and achieving a synergistic improvement in explosion-proof safety and thermal management efficiency.

[0038] 2. This invention utilizes the chimney effect of rising hot air. Under normal operating conditions, outdoor air is introduced through the bottom air inlet and discharged through the top hot air outlet, forming natural convection cooling with little or no energy consumption. When the temperature rises to a set threshold, the exhaust fan starts to assist in ventilation; when the temperature rises further, the exhaust fan automatically switches to high-speed operation to increase the ventilation force. This tiered cooling mode fully utilizes natural cold sources while providing forced cooling during high-temperature periods, achieving on-demand cooling.

[0039] 3. This invention monitors the interior temperature of the explosion-proof room in real time using a temperature sensor. The controller presets a first temperature threshold and a second temperature threshold. Based on the comparison between the real-time temperature and the threshold, it automatically controls the exhaust fan to switch between three states: off / low speed, medium speed, and high speed. When the real-time temperature is below the first threshold, cooling relies entirely on natural convection; when the temperature is between the two thresholds, it operates at medium speed to assist in heat dissipation; when the temperature reaches or exceeds the second threshold, it switches to high speed to enhance heat dissipation. This hierarchical control strategy avoids frequent start-stop of the fan and ensures that the temperature is always stably controlled within the suitable operating range of the electrical components.

[0040] 4. This invention incorporates a dustproof mesh at the air inlet to effectively block outdoor dust from entering the explosion-proof chamber; a dustproof mesh at the bottom of the hot air outlet prevents impurities from entering the connecting duct and damaging the exhaust fan. Simultaneously, an explosion-proof flame arrester is installed at the connection between the connecting duct and the explosion-proof chamber, ensuring ventilation while blocking the spread of explosion flames; anti-static wires are used for bridging at each connection point to eliminate the risk of static electricity ignition caused by airflow friction in dusty environments. These designs enable the system to adapt to the high-dust, high-risk environment of a silk-making workshop, ensuring long-term stable operation.

[0041] 5. This invention fully utilizes natural wind for convection cooling, only activating the exhaust fan when necessary to assist heat dissipation. Compared to traditional cooling methods that rely on external air conditioners or continuous cooling, the overall energy consumption is significantly reduced. Simultaneously, by stabilizing the temperature inside the electrical control cabinet within a suitable range (e.g., 20-25℃), it effectively eliminates inverter overheating alarms, burnouts, and even explosions, significantly reducing equipment repair and replacement frequency and maintenance costs, and extending the lifespan of electrical components.

[0042] 6. This invention adopts a modular structure design. The air inlet pipe is suspended in the air by a hanger and a steel frame, saving ground space. Door openings are opened on the side wall of the explosion-proof chamber and explosion-proof doors are installed to facilitate equipment maintenance. Multiple observation windows are set at intervals along the length of the explosion-proof chamber and are equipped with explosion-proof glass. Staff can observe the operating status of the internal equipment in real time without opening the door, promptly detect potential hazards, and improve operational safety and convenience. Attached Figure Description

[0043] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is a schematic diagram of the overall structure of the explosion-proof isolation and ventilation temperature control system for the electrical control cabinet of a dust removal room provided in an embodiment of the present invention;

[0045] Figure 2 This is a schematic diagram of the rear structure of the system provided in an embodiment of the present invention;

[0046] Figure 3 This is a schematic diagram of the internal structure of the explosion-proof room provided in an embodiment of the present invention;

[0047] Figure 4 This is a schematic diagram of the air inlet pipe structure provided in an embodiment of the present invention;

[0048] Figure 5 This is a schematic diagram of the hot air exhaust outlet structure provided in an embodiment of the present invention.

[0049] Attached reference numerals: 1. Ground; 2. Explosion-proof room; 3. Electrical control cabinet; 4. Explosion-proof room door; 5. Observation window; 6. Air inlet duct; 7. Air inlet; 8. Mounting steel frame; 9. Hanging rod; 10. Exhaust fan mounting base; 11. Exhaust fan; 12. Connecting duct; 13. Hot air exhaust outlet. Detailed Implementation

[0050] 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.

[0051] Example 1

[0052] This embodiment provides an explosion-proof isolation and ventilation temperature control system for the electrical control cabinet of a dust removal room.

[0053] like Figure 1 , Figure 2 As shown, the system includes an explosion-proof chamber 2 located on the ground 1. The explosion-proof chamber 2 is an independent, enclosed space constructed with explosion-proof building materials, effectively blocking the bidirectional transmission of internal and external ignition sources and blast shock waves. An electrical control cabinet 3 is installed inside the explosion-proof chamber 2, integrating electrical components such as frequency converters and controllers. By placing the electrical control cabinet 3 inside the explosion-proof chamber 2, physical isolation is achieved from the flammable and explosive environment inside the dust removal room.

[0054] like Figure 1 , Figure 3 As shown, the side wall of the explosion-proof chamber 2 has an opening, through which the air inlet end of the air inlet pipe 6 connects to the outside. The air inlet pipe 6 extends along the length of the explosion-proof chamber 2 and is suspended inside the explosion-proof chamber 2 by a hanger 9 and a mounting steel frame 8. Specifically, as... Figure 3 As shown, the top ends of multiple sets of hangers 9 are fixedly installed on the inner top wall of the explosion-proof chamber 2, and a mounting steel frame 8 is fixedly installed at the bottom end of each set of hangers 9, forming a support structure for supporting the air inlet pipe 6, on which the air inlet pipe 6 is placed. Multiple air inlets 7 are provided on the side wall of the air inlet pipe 6 corresponding to the positions of each electrical control cabinet 3. Each air inlet 7 is equipped with a dustproof mesh to block dust particles from the outdoor air from entering the explosion-proof chamber 2. Simultaneously, a dustproof mesh is also installed at the initial air inlet position through the opening for initial filtration.

[0055] like Figure 1 , Figure 2 , Figure 3 As shown, an exhaust fan mounting base 10 is fixedly installed on the top of the explosion-proof chamber 2, and an exhaust fan 11 is fixedly installed on the top of the explosion-proof chamber 2 via the exhaust fan mounting base 10. The exhaust end of the exhaust fan 11 is located on its side wall and communicates with the interior of the explosion-proof chamber 2 via a connecting duct 12. The connecting duct 12 is curved, with one end fixedly connected to and communicating with the exhaust end of the exhaust fan 11, and the other end passing through the top of the explosion-proof chamber 2 and extending into its interior, forming an angle transition from a side interface to a vertically downward pipe. A hot air outlet 13 is provided at the end of the connecting duct 12 inside the explosion-proof chamber 2. The hot air outlet 13 is funnel-shaped, with its diameter gradually increasing from top to bottom, and is located inside the explosion-proof chamber 2 near the top. A dustproof mesh is provided at the bottom of the hot air outlet 13 to prevent impurities in the explosion-proof chamber 2 from entering the connecting duct 12 and damaging the exhaust fan 11.

[0056] With the above structure, the air inlet duct 6 introduces outdoor air from the bottom, and the exhaust fan 11 exhausts indoor hot air from the top, forming an air convection channel from bottom to top with the air inlet duct 6, making full use of the chimney effect of rising hot air to achieve natural convection cooling.

[0057] like Figure 1 , Figure 2As shown, a doorway is provided on the side wall of the explosion-proof chamber 2, and an explosion-proof chamber door 4 is movably installed in the doorway. The explosion-proof chamber door 4 has sealing performance and explosion-proof capability, and fits tightly against the doorway when closed. Multiple observation windows 5 are provided at intervals along the length of the explosion-proof chamber 2 on the side wall outside the doorway. Each observation window 5 has explosion-proof glass fixedly installed on its inner wall, allowing personnel to observe the operating status of equipment such as the internal electrical control cabinet 3 in real time without opening the explosion-proof chamber door 4.

[0058] like Figure 3 As shown, this system also includes an explosion-proof safety structure. Specifically, a flame arrester of the explosion-proof type is installed at the connection between the air duct 12 and the explosion-proof chamber 2. This flame arrester complies with the standard "Flame Arresters for Explosion-proof Gas Pipelines" (GBT13347-2010) and can block the spread of explosion flames while ensuring ventilation, preventing the flames from spreading to the outside through the exhaust duct. Anti-static wires are connected across each connection between the air inlet duct 6, the air duct 12, and the explosion-proof chamber 2 to eliminate the risk of static electricity ignition caused by airflow friction in the dusty environment.

[0059] like Figure 1 , Figure 3 As shown, this system also includes a temperature sensor and a controller. The temperature sensor is installed inside the explosion-proof room 2 to monitor the indoor temperature in real time, with a sampling period of ≤2s, enabling rapid response to temperature changes. The controller is electrically connected to the temperature sensor and the exhaust fan 11, and is used to control the operation of the exhaust fan 11 based on the monitored temperature. The exhaust fan 11 is a variable frequency fan, and the controller can dynamically adjust the operating frequency of the exhaust fan 11 according to the temperature value monitored by the temperature sensor.

[0060] The system operation process in this embodiment is as follows:

[0061] Under normal operating conditions, the hot air in the explosion-proof chamber 2 naturally rises and gathers upwards, utilizing the chimney effect of rising hot air (hot air rises upwards). It is then discharged outdoors through the hot air outlet 13 and the connecting air duct 12. At the same time, outdoor air enters the explosion-proof chamber 2 through the air inlet 7 via the air inlet duct 6 under the action of air pressure difference, forming a natural convection cooling from bottom to top. At this time, the exhaust fan 11 is in a closed or low-speed operation state, requiring no or only a small amount of energy consumption.

[0062] When the temperature sensor detects that the internal temperature of the explosion-proof room 2 rises to the first threshold (e.g., 22°C), the controller controls the exhaust fan 11 to start running at medium speed, assisting natural convection for forced ventilation and increasing heat dissipation.

[0063] When the temperature sensor detects that the internal temperature of the explosion-proof chamber 2 has risen further to the second threshold (e.g., 25°C), the controller controls the exhaust fan 11 to switch to high-speed operation to enhance exhaust heat dissipation and ensure that the temperature inside the explosion-proof chamber 2 quickly drops back to a safe range.

[0064] This tiered control strategy enables on-demand heat dissipation, making full use of natural cooling sources while providing forced heat dissipation during high-temperature periods.

[0065] Example 2

[0066] This embodiment provides a method for explosion-proof isolation and ventilation temperature control of an electrical control cabinet in a dust removal room. This method is applied to the system described in Embodiment 1, and includes the following steps:

[0067] S1: Outdoor air is introduced through the air inlet duct 6 located at the bottom of the explosion-proof chamber 2. Specifically, the air inlet end of the air inlet duct 6 passes through an opening in the side wall of the explosion-proof chamber 2 and connects to the outside. Due to the exhaust effect of the exhaust fan 11 in step S2 or the natural convection formed by the rising hot air, a negative pressure is generated inside the explosion-proof chamber 2. Outdoor air enters the air inlet duct 6 under the action of the pressure difference between the inside and outside, and then enters the interior of the explosion-proof chamber 2 through multiple air inlets 7 at the bottom of the air inlet duct 6 corresponding to the positions of each electrical control cabinet 3. The dustproof mesh plates installed at the air inlets 7 effectively block dust particles in the outdoor air, ensuring that the air entering the explosion-proof chamber 2 is clean.

[0068] S2: The hot air inside the explosion-proof chamber 2 is exhausted from the top by an exhaust fan 11 located at the top. Specifically, the air inlet of the exhaust fan 11 is connected to the interior of the explosion-proof chamber 2 near the top via a connecting duct 12. The end of the connecting duct 12 inside the explosion-proof chamber 2 is provided with a hot air outlet 13, which is funnel-shaped and located near the top. Under the suction action of the exhaust fan 11, the hot air inside the explosion-proof chamber 2 is exhausted to the outside through the hot air outlet 13 and the connecting duct 12. Through steps S1 and S2, the air inlet duct 6 and the exhaust fan 11 form an upward air convection channel, making full use of the chimney effect of rising hot air.

[0069] S3: The temperature inside explosion-proof chamber 2 is collected in real time by a temperature sensor installed inside the chamber, and the collected temperature signal is transmitted to the controller. The sampling period of the temperature sensor is ≤2s to ensure rapid response to temperature changes.

[0070] S4: The controller presets a first temperature threshold T1 and a second temperature threshold T2, wherein the second temperature threshold T2 is higher than the first temperature threshold T1. In this embodiment, T1 is set to 22°C and T2 to 25°C.

[0071] S5: The controller compares the received real-time temperature T with the preset first temperature threshold T1 and second temperature threshold T2 in sequence, and controls the operation of the exhaust fan 11 according to the comparison results.

[0072] When the real-time temperature T is lower than the first temperature threshold T1, it indicates that the temperature inside the explosion-proof chamber 2 is within a suitable range, and natural convection cooling is sufficient to meet the heat dissipation requirements. At this time, the controller controls the exhaust fan 11 to be turned off or kept in a low-speed operation state, relying entirely on the natural convection formed by the rising hot air for passive cooling, achieving zero or low energy consumption heat dissipation.

[0073] When the real-time temperature T is greater than or equal to the first temperature threshold T1 and lower than the second temperature threshold T2, it indicates that natural convection cooling is insufficient to control the temperature within the ideal range, but the temperature difference is not yet significant. At this time, the controller controls the exhaust fan 11 to start and run at medium speed to assist natural convection in forced ventilation, thus controlling energy consumption while ensuring heat dissipation.

[0074] When the real-time temperature T is greater than or equal to the second temperature threshold T2, it indicates that the temperature inside the explosion-proof room 2 has approached or exceeded the upper limit allowed by the electrical components, requiring enhanced heat dissipation. At this time, the controller controls the exhaust fan 11 to switch to high-speed operation, increasing the exhaust force to quickly expel the hot air from the room and ensure that the temperature quickly drops back to a safe range.

[0075] Through the above-mentioned hierarchical control strategy, this method realizes the automatic adjustment of heat dissipation intensity according to the actual temperature, which not only avoids frequent start-stop of the fan, but also ensures that the temperature in the explosion-proof room 2 is always stably controlled within the appropriate operating range of the electrical components.

[0076] In this method, the exhaust fan 11 is a variable frequency fan, and the controller switches between low-speed, medium-speed, and high-speed operating states by adjusting its operating frequency. Meanwhile, the explosion-proof flame arrester installed at the connection between the air duct 12 and the explosion-proof room 2 ensures ventilation while blocking the spread of explosion flames. The anti-static wires bridging each connection effectively eliminate the risk of static electricity ignition, ensuring the safe operation of the system in dusty environments.

[0077] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, alterations, additions or substitutions made by those skilled in the art within the scope of the present invention should be protected by the present invention.

Claims

1. An explosion-proof isolation and ventilation temperature control system for an electrical control cabinet in a dust removal room, characterized in that, include: An explosion-proof room (2) is set on the ground (1). The explosion-proof room (2) is an independent closed space. An electrical control cabinet (3) is installed inside the room to physically isolate the electrical control cabinet (3) from the flammable and explosive environment in the dust removal room. An air inlet pipe (6) is installed on the side wall of the explosion-proof chamber (2), with its air inlet end connected to the outside and its air outlet located inside the explosion-proof chamber (2) near the bottom, for introducing outdoor air from the bottom. The exhaust fan (11) is installed at the top of the explosion-proof room (2). Its air inlet is connected to the interior of the explosion-proof room (2) near the top through the connecting air pipe (12), and its air outlet is connected to the outside. It is used to exhaust hot air from the top and form an air convection channel from bottom to top with the air inlet pipe (6). A temperature sensor is installed inside the explosion-proof room (2) to monitor the indoor temperature in real time; The controller, electrically connected to the temperature sensor and the exhaust fan (11), is used to control the operating status of the exhaust fan (11) according to the monitored temperature.

2. The explosion-proof isolation and ventilation temperature control system for the electrical control cabinet of a dust removal room according to claim 1, characterized in that, The electrical control cabinet (3) consists of multiple units, which are arranged at intervals along the length of the explosion-proof room (2). The air inlet end of the air inlet pipe (6) passes through the opening in the side wall of the explosion-proof room (2) and connects to the outside. The air inlet pipe (6) extends along the length of the explosion-proof room (2) and is suspended inside the explosion-proof room (2). The bottom of the air inlet pipe (6) is provided with multiple air inlets (7) corresponding to the positions of each electrical control cabinet (3). Each air inlet (7) is provided with a dustproof mesh plate.

3. The explosion-proof isolation and ventilation temperature control system for the electrical control cabinet of a dust removal room according to claim 2, characterized in that, The exhaust fan (11) is fixedly installed on the top of the explosion-proof room (2) via the exhaust fan mounting base (10). One end of the connecting duct (12) is fixedly connected to and communicates with the exhaust end of the exhaust fan (11). The other end of the connecting duct (12) passes through the top of the explosion-proof room (2) and extends into its interior. The end of the connecting duct (12) located inside the explosion-proof room (2) is provided with a hot air outlet (13). The hot air outlet (13) is located inside the explosion-proof room (2) near the top, and a dustproof mesh is provided at the bottom of the hot air outlet (13).

4. The explosion-proof isolation and ventilation temperature control system for the electrical control cabinet of a dust removal room according to claim 2, characterized in that, It also includes multiple sets of hangers (9) and mounting steel frames (8); the top of each set of hangers (9) is fixedly installed on the inner wall of the top of the explosion-proof room (2), and a mounting steel frame (8) is fixedly installed at the bottom of each set of hangers (9), forming a support structure for supporting the air inlet pipe (6); the air inlet pipe (6) is placed on the support structure.

5. The explosion-proof isolation and ventilation temperature control system for the electrical control cabinet of a dust removal room according to claim 1, characterized in that, The explosion-proof chamber (2) has a door opening on its side wall, and an explosion-proof chamber door (4) is installed in the door opening. Multiple observation windows (5) are provided on the side wall of the explosion-proof chamber (2) at intervals along its length outside the door opening, and explosion-proof glass is fixedly installed on the inner wall of each observation window (5).

6. The explosion-proof isolation and ventilation temperature control system for the electrical control cabinet of a dust removal room according to claim 3, characterized in that, The exhaust end of the exhaust fan (11) is located on its side wall, and the connecting duct (12) is curved, extending from the exhaust end of the exhaust fan (11) to the top of the explosion-proof room (2) and passing through it, forming an angle transition from the side interface to the vertical downward pipe.

7. The explosion-proof isolation and ventilation temperature control system for the electrical control cabinet of a dust removal room according to claim 3, characterized in that, The hot air outlet (13) is funnel-shaped, and its diameter gradually increases from top to bottom.

8. The explosion-proof isolation and ventilation temperature control system for the electrical control cabinet of a dust removal room according to claim 2, characterized in that, The air inlet pipe (6) is suspended inside the explosion-proof room (2) by a hanger (9) and a mounting steel frame (8), and is located on one side of the electrical control cabinet (3); the air inlet (7) is opened on the side wall of the air inlet pipe (6) and is directly opposite the waist of the electrical control cabinet, for blowing outdoor air toward the electrical control cabinet (3).

9. The explosion-proof isolation and ventilation temperature control system for the electrical control cabinet of a dust removal room according to claim 1, characterized in that, It also includes an explosion-proof safety structure, which comprises: An explosion-proof flame arrester is installed at the connection between the connecting duct (12) and the explosion-proof room (2) to block the spread of explosion flames while ensuring ventilation; and an anti-static wire is connected across the connection between the air inlet pipe (6), the connecting duct (12) and the explosion-proof room (2).

10. A method for explosion-proof isolation and ventilation temperature control of an electrical control cabinet in a dust removal room, applied to the system described in any one of claims 1 to 9, characterized in that, Includes the following steps: S1: Outdoor air is introduced through the air inlet pipe (6) located at the bottom of the explosion-proof room (2), and the outdoor air enters the explosion-proof room (2) from the bottom; S2: The internal hot air is discharged from the top by the exhaust fan (11) located at the top of the explosion-proof room (2), forming a convection channel from bottom to top with the air inlet pipe (6); S3: The temperature inside the explosion-proof room (2) is collected in real time by a temperature sensor and the temperature signal is transmitted to the controller; S4: The controller presets a first temperature threshold and a second temperature threshold, wherein the second temperature threshold is higher than the first temperature threshold; S5: The controller compares the real-time temperature with the first temperature threshold and the second temperature threshold sequentially. When the real-time temperature is lower than the first temperature threshold, the exhaust fan (11) is controlled to be turned off or run at low speed. When the real-time temperature is greater than or equal to the first temperature threshold and lower than the second temperature threshold, the exhaust fan (11) is controlled to start and run at medium speed; When the real-time temperature is greater than or equal to the second temperature threshold, control the exhaust fan (11) to switch to high-speed operation.

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