Explosion-proof positive pressure system
By introducing cleaning and alarm components into the explosion-proof positive pressure system, the problems of spark particle blockage and lack of alarm were solved, realizing automatic cleaning and alarm functions, and ensuring the stability and safety of the device.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NANYANG HENGJU ELECTRICAL EQUIP CO LTD
- Filing Date
- 2025-05-26
- Publication Date
- 2026-05-05
AI Technical Summary
Existing explosion-proof positive pressure control devices lack cleaning functions, the spark particle blocking plate is easily clogged and has no alarm indication, and cannot provide timely warnings when the air pressure is abnormal.
The design includes a cleaning component and an alarm component. The cleaning component uses a motor-driven screw to move a scraper to clean impurities on the spark particle blocking plate. The alarm component uses a magnetic safety valve to trigger a buzzer to sound an alarm.
The system enables automatic cleaning of the spark particle blocking plate to prevent blockage, and automatically alarms when the air pressure is abnormal, ensuring the safe and reliable operation of the device.
Smart Images
Figure CN224195377U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of explosion-proof device technology, specifically relating to an explosion-proof positive pressure system. Background Technology
[0002] Explosion-proof refers to the ability to withstand the impact and heat of an explosion without loss and still function normally. Preventing an explosion requires considering three necessary conditions; restricting any one of these conditions limits the occurrence of an explosion. Appropriate explosion-proof instruments and electrical equipment should be selected. Standard structures include: flameproof, increased safety, pressurized, sand-filled, intrinsically safe, and oil-filled.
[0003] Chinese patent application number 2013203965924 discloses an explosion-proof positive pressure control device. The device includes a cabinet with an inlet pipe, an exhaust pipe, and a mechanical pressure gauge. A diaphragm-type pressure reducing valve is installed on the inlet pipe, and a pneumatic micro-pressure switch is mounted on the diaphragm-type pressure reducing valve. An adjustable one-way throttle valve, an explosion-proof flame arrestor cap, and an exhaust buffer are connected in series on the exhaust pipe. A spark particle blocking plate is installed in the exhaust buffer. This invention overcomes the shortcomings of existing technologies by using only pneumatic and mechanical components, providing a stable and reliable positive pressure explosion-proof environment while eliminating the dangers posed by electrical equipment.
[0004] The aforementioned patent does not have a cleaning function and cannot clean the spark particle baffle in the exhaust buffer zone. After long-term use, the spark particle baffle is prone to blockage due to the accumulation of impurities on one end. In addition, the original device does not have an alarm function. When the air pressure inside the cabinet increases abnormally, it cannot alarm to alert the staff when exhausting through the magnetic safety valve. Utility Model Content
[0005] To address the problems mentioned in the background art, this utility model provides an explosion-proof positive pressure system with a cleaning function, which can clean the spark particle blocking plate.
[0006] To achieve the above objectives, this utility model provides the following technical solution: an explosion-proof positive pressure system, comprising a cabinet, an air inlet pipe fixed at one end of the cabinet, a pneumatic micro-pressure switch installed in the air inlet pipe, a pressure gauge fixed on one side of the upper end of the cabinet, a magnetic safety valve installed on one side of the pressure gauge, a buffer box installed on one side of the cabinet, the buffer box being connected to the cabinet via an exhaust pipe, an adjustable one-way throttle valve installed on the exhaust pipe, a spark particle blocking plate installed on one side inside the buffer box, an alarm component installed at the position corresponding to the magnetic safety valve at the upper end of the cabinet, and a cleaning component installed at the position corresponding to the spark particle blocking plate inside the buffer box.
[0007] Preferably, the cleaning assembly includes a motor, a chip discharge port, a movable plate, a collection box, a lead screw, a scraper, and an installation assembly. A motor is installed on one side of the upper part of the cabinet, corresponding to the spark particle blocking plate. A lead screw is installed at the motor output end, and a movable plate is threaded onto the surface of the lead screw. Both ends of the movable plate are in close contact with the inner wall of the buffer box. A scraper is fixed to the end of the movable plate near the spark particle blocking plate. A chip discharge port is opened at the lower end of the buffer box, corresponding to the scraper. A collection box is installed at the lower end of the buffer box, corresponding to the chip discharge port. The collection box and the buffer box are connected by the installation assembly.
[0008] Preferably, the installation assembly includes a folding plate, a positioning plate, fixing bolts, and fixing holes. The folding plate is welded to the lower end of the buffer box at the position corresponding to the collection box. The positioning plate is fixed to the rear end of the folding plate. The collection box and the folding plate are connected by fixing bolts. The lower end of the collection box is provided with fixing holes corresponding to the fixing bolts. The folding plate is provided with through holes corresponding to the fixing bolts.
[0009] Preferably, the alarm assembly includes a fixed box, a sliding plate, a sliding rod, a top plate, a connecting plate, a buzzer, an exhaust port, and a buffer assembly. The fixed box is fixed at the upper end of the cabinet, corresponding to the position of the magnetic safety valve. A sliding plate slides inside the fixed box, and a sliding rod is fixed to the upper end of the sliding plate. A sliding hole corresponding to the sliding rod is provided at the upper end of the fixed box, and a top plate is fixed to the upper end of the sliding rod. A connecting plate is provided on the upper side of the fixed box, corresponding to the position of the top plate. A buzzer is installed at the lower end of the connecting plate, corresponding to the position of the top plate, and a switch is provided at the lower end of the buzzer. An exhaust port is provided at one end of the fixed box, and the connecting plate is connected to the fixed box via the buffer assembly.
[0010] Preferably, the buffer assembly includes a vertical plate, a sliding groove, a fixing rod, and a spring. The vertical plate is fixed at the upper end of the fixed box at a position corresponding to the connecting plate. One end of the vertical plate is provided with a sliding groove corresponding to the connecting plate. Two fixing rods are provided in the sliding groove. A spring is sleeved on the outside of the fixing rod at the upper end of the connecting plate.
[0011] Preferably, one side of the connecting plate is provided with a sliding hole corresponding to the fixing rod, and the vertical plate and the fixing box, as well as the fixing box and the cabinet, are all welded by spot welding.
[0012] Compared with the prior art, the beneficial effects of this utility model are:
[0013] 1. This utility model, by setting up a cleaning component, turns on the motor to drive the lead screw to rotate in the buffer box. The rotation of the lead screw drives the moving plate to move in the buffer box. The movement of the moving plate drives the scraper to scrape and clean the impurities attached to one end of the spark particle blocking plate. The impurities fall into the collection box through the chip discharge port. By setting up the cleaning component, the spark particle blocking plate can be cleaned, avoiding the blockage caused by a large amount of impurities accumulating on one end of the spark particle blocking plate after long-term use.
[0014] 2. This utility model, by setting an alarm component, when the internal pressure of the cabinet increases abnormally, the magnetic safety valve is opened and gas enters the fixed box. The increased internal pressure of the fixed box pushes the slide plate upward, which in turn pushes the slide rod upward. The top plate at the upper end of the slide rod contacts the switch at the lower end of the buzzer, thereby activating the buzzer alarm. The gas is discharged through the exhaust port. By setting the alarm component, the cabinet can automatically alarm and alert the staff when the internal pressure increases abnormally. Attached Figure Description
[0015] Figure 1 This is a perspective view of the present utility model;
[0016] Figure 2 This is a sectional perspective view of the present invention;
[0017] Figure 3 This is a perspective view of the collection box of this utility model during installation;
[0018] Figure 4 This is a perspective view of the alarm component of this utility model;
[0019] In the diagram: 1. Cabinet; 2. Cleaning assembly; 21. Motor; 22. Chip outlet; 23. Moving plate; 24. Collection box; 25. Lead screw; 26. Scraper; 27. Mounting assembly; 271. Folding plate; 272. Positioning plate; 273. Fixing bolt; 274. Fixing hole; 3. Alarm assembly; 31. Fixing box; 32. Slide plate; 33. Slide rod; 34. Top plate; 35. Connecting plate; 36. Buzzer; 37. Exhaust port; 38. Buffer assembly; 381. Vertical plate; 382. Slide groove; 383. Fixing rod; 384. Spring; 4. Exhaust pipe; 5. Buffer box; 6. Adjustable one-way throttle valve; 7. Pressure gauge; 8. Pneumatic micro-pressure switch; 9. Air inlet pipe; 10. Magnetic safety valve; 11. Spark particle blocking plate. Detailed Implementation
[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0021] Example 1
[0022] Please see Figure 1-4This utility model provides the following technical solution: an explosion-proof positive pressure system, including a cabinet 1, an air inlet pipe 9 fixed at one end of the cabinet 1, a pneumatic micro-pressure switch 8 installed in the air inlet pipe 9, a pressure gauge 7 fixed on one side of the upper end of the cabinet 1, a magnetic safety valve 10 installed on one side of the pressure gauge 7, a buffer box 5 installed on one side of the cabinet 1, the buffer box 5 and the cabinet 1 are connected by an exhaust pipe 4, an adjustable one-way throttle valve 6 is installed on the exhaust pipe 4, a spark particle blocking plate 11 is installed on one side inside the buffer box 5, an alarm component 3 is installed at the position corresponding to the magnetic safety valve 10 at the upper end of the cabinet 1, and a cleaning component 2 is installed at the position corresponding to the spark particle blocking plate 11 inside the buffer box 5.
[0023] Specifically, the cleaning component 2 includes a motor 21, a chip discharge port 22, a movable plate 23, a collection box 24, a lead screw 25, a scraper 26, and an installation component 27. The motor 21 is installed on one side of the upper part of the cabinet 1, corresponding to the position of the spark particle blocking plate 11. The output end of the motor 21 is provided with a lead screw 25. The movable plate 23 is threadedly connected to the surface of the lead screw 25. Both ends of the movable plate 23 are in close contact with the inner wall of the buffer box 5. The scraper 26 is fixed to one end of the movable plate 23 near the spark particle blocking plate 11. The chip discharge port 22 is opened at the lower end of the buffer box 5, corresponding to the position of the scraper 26. The collection box 24 is provided at the lower end of the buffer box 5, corresponding to the position of the chip discharge port 22. The collection box 24 and the buffer box 5 are connected by the installation component 27.
[0024] By adopting the above technical solution, the motor 21 is turned on to drive the lead screw 25 to rotate in the buffer box 5. The rotation of the lead screw 25 drives the moving plate 23 to move in the buffer box 5. The movement of the moving plate 23 drives the scraper 26 to scrape and clean the impurities attached to one end of the spark particle blocking plate 11. The impurities fall into the collection box 24 through the chip discharge port 22. By setting the cleaning component 2, the spark particle blocking plate 11 can be cleaned, avoiding the spark particle blocking plate 11 from being blocked by a lot of impurities attached to one end after long-term use.
[0025] Specifically, the installation component 27 includes a folding plate 271, a positioning plate 272, a fixing bolt 273, and a fixing hole 274. The folding plate 271 is welded to the lower end of the buffer box 5 at the position corresponding to the collection box 24. The positioning plate 272 is fixed to the rear end of the folding plate 271. The collection box 24 and the folding plate 271 are connected by the fixing bolt 273. The lower end of the collection box 24 is provided with a fixing hole 274 corresponding to the fixing bolt 273. The folding plate 271 is provided with a through hole corresponding to the fixing bolt 273.
[0026] By adopting the above technical solution, when installing the collection box 24, the collection box 24 is placed on the folding plate 271, and one end of the collection box 24 is tightly attached to one end of the folding plate 271. At the same time, the rear end of the collection box 24 is tightly attached to the positioning plate 272. Then, the fixing bolt 273 can be screwed into the fixing hole 274 at the lower end of the collection box 24 to fix the collection box 24. By setting the installation component 27, it is easy to install and fix the collection box 24, which facilitates the disassembly and assembly of the collection box 24, and facilitates the cleaning of impurities in the collection box 24.
[0027] In this embodiment, when using the explosion-proof positive pressure device, the device is installed in a suitable position, and the pneumatic micro-pressure switch 8 is turned on to send air into the cabinet 1 through the air inlet pipe 9 to maintain positive pressure inside the cabinet 1. Explosive substances generated inside the cabinet 1 are discharged from the exhaust pipe 4 into the buffer box 5 for isolation and buffering. The spark particle baffle 11 can filter out spark particles in the gas. The adjustable one-way throttle valve 6 is used to control the exhaust gas flow rate. The magnetic safety valve 10 on the cabinet 1... When the internal air pressure abnormally increases, the system can automatically open to perform emergency air exhaust and depressurization, ensuring the safety of cabinet 1. By setting up cleaning component 2, the motor 21 drives the lead screw 25 to rotate in the buffer box 5. The rotation of the lead screw 25 drives the moving plate 23 to move within the buffer box 5. The movement of the moving plate 23 drives the scraper 26 to scrape and clean impurities attached to one end of the spark particle blocking plate 11. The impurities fall into the collection box 24 through the chip discharge port 22. The cleaning component 2 can clean the spark particle blocking plate 11, preventing prolonged use of the spark particle blocking plate 11. When the particle blocking plate 11 is clogged with a lot of impurities, the collection box 24 is installed by setting the installation component 27. The collection box 24 is placed on the folding plate 271 and one end of the collection box 24 is pressed tightly against one end of the folding plate 271. At the same time, the rear end of the collection box 24 is pressed tightly against the positioning plate 272. Then, the fixing bolt 273 can be screwed into the fixing hole 274 at the lower end of the collection box 24 to fix the collection box 24. The installation component 27 facilitates the installation and fixing of the collection box 24, which in turn facilitates the disassembly and assembly of the collection box 24 and the cleaning of impurities in the collection box 24.
[0028] Example 2
[0029] The difference between this embodiment and embodiment 1 is that the alarm component 3 includes a fixed box 31, a sliding plate 32, a sliding rod 33, a top plate 34, a connecting plate 35, a buzzer 36, an exhaust port 37, and a buffer component 38. The fixed box 31 is fixed at the upper end of the cabinet 1 at the position corresponding to the magnetic safety valve 10. The sliding plate 32 slides inside the fixed box 31. The sliding rod 33 is fixed at the upper end of the sliding plate 32. The fixed box 31 has a sliding hole corresponding to the sliding rod 33 at the upper end. The top plate 34 is fixed at the upper end of the sliding rod 33. The connecting plate 35 is set at the position corresponding to the top plate 34 on the upper side of the fixed box 31. The buzzer 36 is installed at the lower end of the connecting plate 35 at the position corresponding to the top plate 34. The buzzer 36 has a switch at the lower end. An exhaust port 37 is opened at one end of the fixed box 31. The connecting plate 35 and the fixed box 31 are connected by the buffer component 38.
[0030] By adopting the above technical solution, when the internal pressure of the cabinet 1 increases abnormally, the magnetic safety valve 10 is opened and gas enters the fixed box 31. The internal pressure of the fixed box 31 increases, thereby pushing the slide plate 32 to move upward. The slide plate 32 pushes the slide rod 33 to move upward. The top plate 34 at the upper end of the slide rod 33 contacts the switch at the lower end of the buzzer 36, thereby activating the buzzer 36 to sound an alarm. The gas is discharged through the exhaust port 37. By setting the alarm component 3, the cabinet 1 can automatically alarm and alert the staff when the internal pressure increases abnormally.
[0031] Specifically, the buffer assembly 38 includes a vertical plate 381, a sliding groove 382, a fixing rod 383, and a spring 384. The vertical plate 381 is fixed at the upper end of the fixed box 31 at a position corresponding to the connecting plate 35. One end of the vertical plate 381 is provided with a sliding groove 382 corresponding to the connecting plate 35. Two fixing rods 383 are provided in the sliding groove 382. A spring 384 is sleeved on the outside of the fixing rod 383 at the upper end of the connecting plate 35.
[0032] By adopting the above technical solution, when the top plate 34 contacts the buzzer 36, the connecting plate 35 at the upper end of the buzzer 36 slides in the groove 382 of the vertical plate 381, and the spring 384 on the fixing rod 383 is compressed. By setting the buffer assembly 38, the contact between the top plate 34 and the buzzer 36 can be buffered, so as to avoid the top plate 34 moving upward too fast and causing damage to the buzzer 36.
[0033] Specifically, the connecting plate 35 has a sliding hole on one side corresponding to the fixing rod 383, and the vertical plate 381 and the fixing box 31, as well as the fixing box 31 and the cabinet 1, are all spot welded together.
[0034] By adopting the above technical solution, the connecting plate 35 can slide on the fixed rod 383, and the spot welding makes the vertical plate 381 and the fixed box 31, as well as the fixed box 31 and the cabinet 1, more secure.
[0035] In this embodiment, by setting the alarm component 3, when the internal pressure of the cabinet 1 increases abnormally, the magnetic safety valve 10 is opened and gas enters the fixed box 31. The internal pressure of the fixed box 31 increases, thereby pushing the slide plate 32 to move upward. The slide plate 32 pushes the slide rod 33 to move upward. The top plate 34 at the upper end of the slide rod 33 contacts the switch at the lower end of the buzzer 36, thereby activating the buzzer 36 to sound an alarm. The gas is discharged through the exhaust port 37. By setting the alarm component 3, the cabinet 1 can automatically alarm and alert the staff when the internal pressure increases abnormally. By setting the buffer component 38, when the top plate 34 contacts the buzzer 36, the connecting plate 35 at the upper end of the buzzer 36 slides in the slide groove 382 of the vertical plate 381. The spring 384 on the fixed rod 383 is compressed. By setting the buffer component 38, the contact of the top plate 34 with the buzzer 36 can be buffered, avoiding damage to the buzzer 36 caused by the excessive upward movement speed of the top plate 34.
[0036] In this utility model, the motor 21 is a previously disclosed technology, and the selected model is 5IK120GN-CF.
[0037] The buzzer 36 in this utility model is a previously disclosed technology, and the selected model is AD16-22SM.
[0038] The structure and working principle of the cabinet 1, exhaust pipe 4, buffer box 5, adjustable one-way throttle valve 6, pressure gauge 7, pneumatic micro-pressure switch 8, air inlet pipe 9, magnetic safety valve 10, and spark particle blocking plate 11 in this utility model have been disclosed in an explosion-proof positive pressure control device disclosed in Chinese patent application number 2013203965924. Its working principle is that the pneumatic micro-pressure switch 8 is turned on to send air into the cabinet 1 through the air inlet pipe 9 to maintain the positive pressure inside the cabinet 1, and the explosive substances generated inside the cabinet 1 are discharged from the exhaust pipe 4 into the buffer box 5 for isolation and buffering. The spark particle blocking plate 11 can filter out spark particles in the gas. The adjustable one-way throttle valve 6 is used to control the gas flow rate of the exhaust. When the gas pressure inside the cabinet 1 increases abnormally, the magnetic safety valve 10 on the cabinet 1 can automatically open with the increased gas pressure to perform emergency exhaust and depressurization to ensure the safety of the cabinet 1.
[0039] The working principle and usage process of this utility model: When using the explosion-proof positive pressure device, install the device in a suitable position, turn on the pneumatic micro-pressure switch 8 to send air into the cabinet 1 through the air inlet pipe 9 to maintain the positive pressure inside the cabinet 1, and discharge the explosive substances generated inside the cabinet 1 into the buffer box 5 through the exhaust pipe 4 for isolation and buffering. The spark particle blocking plate 11 can filter out the spark particles in the gas. The adjustable one-way throttle valve 6 is used to control the gas flow rate of the exhaust. The magnetic safety valve 10 on the cabinet 1 can automatically open when the gas pressure inside the cabinet 1 increases abnormally, and perform emergency exhaust and pressure reduction to ensure the safety of the cabinet 1. By setting the cleaning component 2, the motor 21 is turned on to drive the lead screw 25 to rotate in the buffer box 5. The rotation of the lead screw 25 drives the moving plate 23 to move in the buffer box 5. The movement of the moving plate 23 drives the scraper 26 to scrape and clean the impurities attached to one end of the spark particle blocking plate 11. The impurities fall into the collection box 24 through the chip discharge port 22. By setting the cleaning component 2, the spark particle blocking plate 11 can be cleaned. To prevent the spark particle blocking plate 11 from becoming clogged due to excessive impurities after prolonged use, the collection box 24 is installed using the mounting component 27. The collection box 24 is placed on the folding plate 271, with one end of the collection box 24 tightly against the folding plate 271 and the rear end of the collection box 24 tightly against the positioning plate 272. Then, the fixing bolts 273 are screwed into the fixing holes 274 at the lower end of the collection box 24 to secure it. The installation component 27 facilitates... The collection box 24 is installed and fixed, which facilitates its disassembly and cleaning of impurities. An alarm component 3 is installed so that when the internal pressure of the cabinet 1 increases abnormally, the magnetic safety valve 10 is opened, and gas enters the fixed box 31. The increased internal pressure of the fixed box 31 pushes the slide plate 32 upward, which in turn pushes the slide rod 33 upward. The top plate 34 at the upper end of the slide rod 33 contacts the switch at the lower end of the buzzer 36, thus activating the buzzer 36 to sound an alarm. The pressure is discharged through the vent 37. The alarm component 3 can automatically alarm and alert the staff when the internal pressure of the cabinet 1 increases abnormally. The buffer component 38 can buffer the contact between the top plate 34 and the buzzer 36, so that the connecting plate 35 at the upper end of the buzzer 36 slides in the groove 382 of the vertical plate 381, and the spring 384 on the fixing rod 383 is compressed. The buffer component 38 can buffer the contact between the top plate 34 and the buzzer 36, so as to avoid the buzzer 36 being damaged by the top plate 34 moving upward too fast.
[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. An explosion-proof positive pressure system, comprising a cabinet (1), wherein an air inlet pipe (9) is fixed at one end of the cabinet (1), a pneumatic micro-pressure switch (8) is installed in the air inlet pipe (9), a pressure gauge (7) is fixed on one side of the upper end of the cabinet (1), a magnetic safety valve (10) is installed on one side of the pressure gauge (7), a buffer box (5) is installed on one side of the cabinet (1), the buffer box (5) is connected to the cabinet (1) through an exhaust pipe (4), an adjustable one-way throttle valve (6) is installed on the exhaust pipe (4), and a spark particle blocking plate (11) is installed on one side inside the buffer box (5), characterized in that: An alarm component (3) is installed at the upper end of the cabinet (1) corresponding to the position of the magnetic safety valve (10), and a cleaning component (2) is installed inside the buffer box (5) corresponding to the position of the spark particle blocking plate (11).
2. The explosion-proof positive pressure system according to claim 1, characterized in that: The cleaning component (2) includes a motor (21), a chip discharge port (22), a moving plate (23), a collection box (24), a lead screw (25), a scraper (26), and an installation component (27). The motor (21) is installed on one side of the upper end of the cabinet (1) at a position corresponding to the spark particle blocking plate (11). A lead screw (25) is provided at the output end of the motor (21). A moving plate (23) is threaded onto the surface of the lead screw (25). Both ends of the moving plate (23) are in close contact with the inner wall of the buffer box (5). A scraper (26) is fixed at one end of the moving plate (23) near the spark particle blocking plate (11). A chip discharge port (22) is provided at the lower end of the buffer box (5) at a position corresponding to the scraper (26). A collection box (24) is provided at the lower end of the buffer box (5) at a position corresponding to the chip discharge port (22). The collection box (24) and the buffer box (5) are connected by the installation component (27).
3. The explosion-proof positive pressure system according to claim 2, characterized in that: The installation assembly (27) includes a folding plate (271), a positioning plate (272), a fixing bolt (273), and a fixing hole (274). The folding plate (271) is welded to the lower end of the buffer box (5) at the position corresponding to the collection box (24). The positioning plate (272) is fixed to the rear end of the folding plate (271). The collection box (24) and the folding plate (271) are connected by the fixing bolt (273). The lower end of the collection box (24) is provided with a fixing hole (274) corresponding to the fixing bolt (273). The folding plate (271) is provided with a through hole corresponding to the fixing bolt (273).
4. The explosion-proof positive pressure system according to claim 1, characterized in that: The alarm assembly (3) includes a fixed box (31), a sliding plate (32), a sliding rod (33), a top plate (34), a connecting plate (35), a buzzer (36), an exhaust port (37), and a buffer assembly (38). The fixed box (31) is fixed at the upper end of the cabinet (1) at a position corresponding to the magnetic safety valve (10). A sliding plate (32) slides inside the fixed box (31), and a sliding rod (33) is fixed to the upper end of the sliding plate (32). The upper end of the fixed box (31) is equipped with a... A sliding hole corresponding to the sliding rod (33) is provided. A top plate (34) is fixed at the upper end of the sliding rod (33). A connecting plate (35) is provided on the upper side of the fixed box (31) at the position corresponding to the top plate (34). A buzzer (36) is installed at the lower end of the connecting plate (35) at the position corresponding to the top plate (34). A switch is provided at the lower end of the buzzer (36). An exhaust hole (37) is opened at one end of the fixed box (31). The connecting plate (35) and the fixed box (31) are connected by a buffer assembly (38).
5. The explosion-proof positive pressure system according to claim 4, characterized in that: The buffer assembly (38) includes a vertical plate (381), a slide groove (382), a fixing rod (383), and a spring (384). The vertical plate (381) is fixed at the upper end of the fixed box (31) at a position corresponding to the connecting plate (35). One end of the vertical plate (381) is provided with a slide groove (382) corresponding to the connecting plate (35). Two fixing rods (383) are provided in the slide groove (382). A spring (384) is sleeved on the outside of the fixing rod (383) at the upper end of the connecting plate (35).
6. The explosion-proof positive pressure system according to claim 5, characterized in that: The connecting plate (35) has a sliding hole on one side corresponding to the fixing rod (383). The vertical plate (381) and the fixing box (31) and the fixing box (31) and the cabinet (1) are all welded by spot welding.