An explosion-proof positive pressure cabinet

Abstract

This utility model discloses an explosion-proof positive pressure cabinet, which includes a cabinet body and at least one exhaust pipe. The exhaust pipe is characterized by: a protruding post inside the exhaust pipe; a plurality of equally spaced exhaust holes on the outer wall of the protruding post, communicating with the interior of the cabinet body; an inclined pressure relief section on the protruding post; a filter screen for neutralizing harmful gases at the top of the protruding post; and a liftable piston and adjusting plate inside the exhaust pipe. The piston is fitted onto the outer wall of the protruding post and maintains a distance from the inner bottom of the exhaust pipe. The gas pressure relief threshold is adjusted by adjusting bolts, effectively balancing the pressure difference between the inside and outside of the cabinet and preventing deformation of the cabinet body due to continuous pressure. When the internal pressure of the cabinet exceeds the set threshold, the high-temperature gas medium is neutralized and cooled by the piston and pressure relief section, thereby ensuring that the discharged gas meets safety standards, significantly improving the product's safety, durability, and service life.

Description

Technical Field

[0001] This utility model relates to the field of explosion-proof equipment technology, and in particular to an explosion-proof positive pressure cabinet. Background Technology

[0002] With the rapid development of industries such as petrochemicals, metal smelting, and pharmaceuticals, explosion-proof positive pressure cabinets are being used more and more widely in system control. In hazardous gas environments, how to accurately use positive pressure explosion-proof controllers is crucial. Because electrical equipment inevitably generates electric sparks or forms hot surfaces during operation, once they come into contact with explosive gas mixtures on site, they can lead to explosion accidents, directly endangering the safety of users' property and lives.

[0003] Existing explosion-proof cabinets generally use positive pressure ventilation systems for heat dissipation. Fresh air is forced into the cabinet by a fan or ventilator to create internal positive pressure. Since the air pressure inside the cabinet is higher than that outside, the air is naturally discharged through the gaps or connections between the cabinet and the door, achieving air exchange between the inside and outside and effectively reducing the temperature of the internal electrical equipment.

[0004] However, existing explosion-proof positive pressure cabinets have the following shortcomings in practical applications:

[0005] 1) When the internal pressure of the explosion-proof positive pressure cabinet rises abnormally and is depressurized, the high-temperature gas inside the cabinet may flow out rapidly. If there are flammable and explosive substances in the surrounding environment, it may cause an explosion hazard.

[0006] 2) Existing explosion-proof positive pressure cabinets usually lack a mechanism to effectively balance the pressure difference between the internal air pressure and the external air pressure after the internal air pressure increases. During long-term operation, the cabinet may deform due to the continuous pressure difference, which will affect its explosion-proof performance and structural stability, and reduce its service life.

[0007] Therefore, the applicant has made beneficial designs and found a way to solve the above problems. The technical solution to be introduced below is generated in this context. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the traditional explosion-proof positive pressure cabinet design and to provide a product that improves safety, durability, and service life.

[0009] An explosion-proof positive pressure cabinet includes a cabinet body, the cabinet body having at least one exhaust pipe, characterized in that: a protruding post is provided inside the exhaust pipe, the outer wall of the protruding post has a plurality of equally spaced exhaust holes communicating with the interior of the cabinet body, the protruding post has an inclined pressure relief section, the top of the protruding post has a filter screen for neutralizing harmful gases, the exhaust pipe has a liftable piston and an adjusting plate, the piston is sleeved on the outer wall of the protruding post and maintains a distance from the inner bottom of the exhaust pipe, the adjusting plate is located above the filter screen, a spring is provided between the adjusting plate and the piston, the top of the exhaust pipe has a vent plate, the vent plate has an adjusting bolt and abuts against the adjusting plate.

[0010] Preferably, the vent plate has a plurality of vent holes, and the vent plate is fixed to the top of the exhaust pipe by screws.

[0011] Preferably, the exhaust pipe is provided with a flange, which is connected and fixed to the cabinet by screws, and the outer wall of the exhaust pipe is provided with a number of equally spaced heat dissipation fins.

[0012] Preferably, the protruding post has a blind hole and communicates with the interior of the cabinet, and the vent is located on the side wall of the blind hole.

[0013] Preferably, the exhaust pipe is provided with a plurality of equally spaced guide grooves evenly distributed around a dot as the axis, and the bottom of the guide groove is provided with a threaded hole.

[0014] Preferably, the piston and adjusting plate are provided with guide blocks and are slidably disposed in the guide groove, the threaded hole is provided with a guide rod and passes through the guide block, the other end of the guide rod is connected and fixed to the vent plate by screws, and the adjusting plate is provided with a plurality of equally spaced air outlet holes.

[0015] Preferably, the piston is provided with a through hole for accommodating the protrusion, the two ends of the through hole are provided with expansion portions, a first sealing ring is provided between the through hole and the protrusion, and a second sealing ring is provided between the piston and the exhaust pipe.

[0016] Preferably, the spring is disposed on the outer wall of the guide rod, and the two ends of the spring abut against the guide block.

[0017] Preferably, the pressure relief section is located near the top of the protrusion, and the filter screen is made of activated carbon fiber. Beneficial effects

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] (1) This utility model uses a balance mechanism that adjusts the upper limit of the pressure relief threshold by rotating the adjusting bolt to effectively balance the pressure difference between the inside and outside of the explosion-proof positive pressure cabinet. This mechanism avoids the deformation of the cabinet caused by the continuous pressure difference, significantly improves the structural stability, and effectively extends the service life.

[0020] (2) In this utility model, when the internal pressure of the cabinet continues to rise and exceeds the set upper limit of the threshold, the high-temperature gas medium pushes the piston to rise through the exhaust hole. When a gap is formed between the piston and the pressure relief part for the high-temperature gas medium to pass through, the high-pressure high-temperature gas medium first passes through the filter screen for neutralization treatment, effectively reducing the concentration of harmful gases in the gas medium and ensuring that the emitted gas meets safety standards. Subsequently, the gas medium is further discharged through the regulating plate and the vent plate. Through multi-stage blocking and cooling, it is finally discharged to the external environment at a safe temperature. Through the above design, the safety, durability and service life of the explosion-proof positive pressure cabinet are significantly improved. Attached Figure Description

[0021] Figure 1 This is a structural schematic diagram of an explosion-proof positive pressure cabinet according to the present invention;

[0022] Figure 2 This utility model Figure 1 A magnified view of part A of an explosion-proof positive pressure cabinet;

[0023] Figure 3 This is a side cross-sectional view of an explosion-proof positive pressure cabinet according to the present invention.

[0024] Figure 4 This utility model Figure 3 A magnified view of part B of an explosion-proof positive pressure cabinet;

[0025] The correspondence between the labels and component names in the attached figures is as follows:

[0026] Reference numerals: 1. Cabinet; 2. Exhaust pipe; 3. Piston; 4. Adjusting plate; 5. Spring; 6. Ventilation plate; 7. Adjusting bolt; 8. Guide block; 9. Guide rod; 91. Filter screen; 21. Protruding column; 22. Pressure relief part; 23. Exhaust hole; 24. Flange; 25. Blind hole; 26. Guide groove; 27. Threaded hole; 28. Heat dissipation fins; 31. Through hole; 32. Expansion part; 33. First sealing ring; 34. Second sealing ring; 41. Air outlet; 61. Ventilation hole. Detailed Implementation

[0027] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] In this embodiment of the utility model, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0030] Reference example Figures 1 to 4 An explosion-proof positive pressure cabinet includes a cabinet body 1. The cabinet body 1 is provided with at least one exhaust pipe 2. A protruding post 21 is provided inside the exhaust pipe 2. The outer wall of the protruding post 21 is provided with a plurality of equally spaced exhaust holes 23, which communicate with the interior of the cabinet body 1. The protruding post 21 is provided with an inclined pressure relief part 22. A filter screen 91 for neutralizing harmful gases is provided at the top of the protruding post 21. A liftable piston 3 and an adjusting plate 4 are provided inside the exhaust pipe 2. The piston 3 is sleeved on the outer wall of the protruding post 21 and maintains a distance from the inner bottom of the exhaust pipe 2. The adjusting plate 4 is located above the filter screen 91. A spring 5 is provided between the section plate 4 and the piston 3. A vent plate 6 is provided at the top of the exhaust pipe 2. The vent plate 6 is provided with an adjusting bolt 7 and abuts against the adjusting plate 4. The existing cabinet 1 usually comes with a pressure gauge to monitor the pressure inside the cabinet. When adjusting the upper limit of the pressure threshold, it is necessary to ensure that the cabinet 1 is in a power-off state to avoid accidents during operation. In addition, the air source is continuously input into the cabinet 1. After tightening the adjusting bolt 17 a few turns, the upper limit of the threshold is adjusted. When the pressure reaches the set upper limit of the threshold, the piston 3 moves to allow the internal pressure to be released.

[0031] It is worth mentioning that the vent plate 6 is provided with several vent holes 61. The vent plate 6 is fixed to the top of the exhaust pipe 2 by screws. The vent plate 6 blocks the high-speed, high-temperature gas medium, thereby further reducing the flow speed before discharge, increasing the time that the high-temperature gas medium stays in the exhaust pipe 2, increasing its heat exchange time and reducing the temperature. Finally, the gas medium is safely discharged through the vent holes 61.

[0032] It is worth mentioning that the exhaust pipe 2 is equipped with a flange 24, which is connected and fixed to the cabinet 1 by screws. The outer wall of the exhaust pipe 2 is equipped with several equally spaced heat dissipation fins 28. The heat dissipation fins 28 increase the contact area between the exhaust pipe 2 and the outside air, thereby improving the heat exchange effect and preventing the exhaust pipe 2 from continuously heating up during the continuous exhaust process.

[0033] It is worth mentioning that the protruding column 21 is provided with a blind hole 25 and communicates with the interior of the cabinet 1, and the exhaust hole 23 is provided on the side wall of the blind hole 25;

[0034] It is worth mentioning that the exhaust pipe 2 is evenly distributed with several equally spaced guide grooves 26 around the dot as the axis. The bottom of the guide groove 26 is provided with a threaded hole 27. The guide groove 26 provides a guiding function for the lifting and lowering of the piston 3 and the adjusting plate 4. The threaded hole 27 allows the guide rod 9 to be quickly disassembled or connected to it.

[0035] It is worth mentioning that the piston 3 and the adjusting plate 4 are provided with guide blocks 8, which are slidably set in the guide groove 26. The threaded hole 27 is provided with a guide rod 9, which passes through the guide block 8. The other end of the guide rod 9 is connected and fixed to the vent plate 6 by screws. The adjusting plate 4 is provided with several equally spaced air outlets 41. The adjusting plate 4 blocks the high-speed high-temperature gas medium, thereby further reducing its flow speed and increasing the time that the high-temperature gas medium stays in the exhaust pipe 2. This allows the high-temperature gas medium to transfer heat to the exhaust pipe 2 through thermal radiation. After heat exchange, the temperature of the high-temperature gas medium is reduced, and the air outlets 41 allow the high-temperature gas medium to enter the next layer.

[0036] It is worth mentioning that the piston 3 is provided with a through hole 31 to accommodate the protrusion 21. The two ends of the through hole 31 are provided with expansion portions 32. A first sealing ring 33 is provided between the through hole 31 and the protrusion 21, and a second sealing ring 34 is provided between the piston 3 and the exhaust pipe 2. When the piston 3 rises, the high-temperature gas medium smoothly enters the pressure relief portion 22 along the guide of the expansion portion 32. The first sealing ring 33 and the second sealing ring 34 improve the sealing between the piston 3 and the exhaust pipe 2.

[0037] It is worth mentioning that the spring 5 is set on the outer wall of the guide rod 9, and the two ends of the spring 5 abut against the guide block 8;

[0038] It is worth mentioning that the pressure relief part 22 is located near the top of the protrusion 21, and the filter screen 91 is made of activated carbon fiber. When the electrical components inside the cabinet 1 overheat or malfunction, they will release organic compounds (VOCs). The activated carbon fiber will adsorb the harmful gases and prevent them from being directly emitted into the environment.

[0039] The working principle of this utility model is described as follows.

[0040] Example 1

[0041] By rotating the adjusting bolt 7, the distance between the adjusting plate 4 and the piston 3 is adjusted, thereby changing the preload of the spring 5. The change in the preload of the spring 5 is directly converted into a force acting on the piston 3, thereby adjusting the balance mechanism of the upper limit of the pressure relief threshold. This effectively balances the pressure difference between the inside and outside of the explosion-proof positive pressure cabinet. This mechanism avoids the deformation of the cabinet 1 caused by the continuous pressure difference, significantly improves the structural stability, and effectively extends the service life.

[0042] Example 2

[0043] When the internal pressure of cabinet 1 continues to rise and exceeds the set threshold limit, the high-pressure high-temperature gas medium pushes the piston 3 to rise through the exhaust port 23. When a gap is formed between the through hole 31 and the pressure relief part 22 for the high-temperature gas medium to pass through, the high-pressure high-temperature gas medium first passes through the filter screen 91 for neutralization treatment, effectively reducing the concentration of harmful gases in the gas medium and ensuring that the emitted gas meets safety standards. In addition, the filter screen 91 also effectively reduces the flow rate of the gas medium.

[0044] Subsequently, the gas medium flows through the regulating plate 4 and the vent plate 6, further reducing its flow velocity. Through multi-stage blocking and cooling, it is finally discharged into the external environment at a safe temperature. The above design significantly improves the safety, durability and service life of the explosion-proof positive pressure cabinet.

[0045] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present utility model. It should not be construed that the specific implementation of the present utility model is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present utility model, and all such deductions or substitutions should be considered to fall within the scope of protection defined by the claims submitted by the present utility model.

Claims

1. An explosion-proof positive pressure cabinet, comprising a cabinet body (1), wherein the cabinet body (1) is provided with at least one exhaust pipe (2), characterized in that: The exhaust pipe (2) is provided with a protruding post (21). The outer wall of the protruding post (21) is provided with several equally spaced exhaust holes (23) and communicates with the interior of the cabinet (1). The protruding post (21) is provided with an inclined pressure relief part (22). The top of the protruding post (21) is provided with a filter screen (91) for neutralizing harmful gases. The exhaust pipe (2) is provided with a liftable piston (3) and an adjusting plate (4). The piston (3) is sleeved on the outer wall of the protruding post (21) and maintains a distance from the inner bottom of the exhaust pipe (2). The adjusting plate (4) is located above the filter screen. A spring (5) is provided between the adjusting plate (4) and the piston (3). The top of the exhaust pipe (2) is provided with a vent plate (6). The vent plate (6) is provided with an adjusting bolt (7) and abuts against the adjusting plate (4).

2. The explosion-proof positive pressure cabinet according to claim 1, characterized in that: The vent plate (6) is provided with a number of vent holes (61), and the vent plate (6) is fixed to the top of the exhaust pipe (2) by screws.

3. The explosion-proof positive pressure cabinet according to claim 1, characterized in that: The exhaust pipe (2) is provided with a flange (24), which is connected and fixed to the cabinet (1) by screws. The outer wall of the exhaust pipe (2) is provided with a number of equally spaced heat dissipation fins (28).

4. The explosion-proof positive pressure cabinet according to claim 1, characterized in that: The protruding post (21) is provided with a blind hole (25) and communicates with the interior of the cabinet (1). The exhaust hole (23) is provided on the side wall of the blind hole (25).

5. The explosion-proof positive pressure cabinet according to claim 1, characterized in that: The exhaust pipe (2) has several equally spaced guide grooves (26) evenly distributed around the dot as the axis, and the bottom of the guide grooves (26) is provided with threaded holes (27).

6. The explosion-proof positive pressure cabinet according to claim 5, characterized in that: The piston (3) and the adjusting plate (4) are provided with guide blocks (8) and are slidably disposed in the guide groove (26). The threaded hole (27) is provided with a guide rod (9) and passes through the guide block (8). The other end of the guide rod (9) is connected and fixed to the vent plate (6) by screws. The adjusting plate (4) is provided with several equally spaced air outlet holes (41).

7. The explosion-proof positive pressure cabinet according to claim 1, characterized in that: The piston (3) is provided with a through hole (31) for accommodating the protrusion (21), and expansion portions (32) are provided at both ends of the through hole (31). A first sealing ring (33) is provided between the through hole (31) and the protrusion (21), and a second sealing ring (34) is provided between the piston (3) and the exhaust pipe (2).

8. The explosion-proof positive pressure cabinet according to claim 1, characterized in that: The spring (5) is disposed on the outer wall of the guide rod (9), and the two ends of the spring (5) abut against the guide block (8).

9. The explosion-proof positive pressure cabinet according to claim 1, characterized in that: The pressure relief part (22) is located near the top of the protrusion (21), and the filter screen (91) is made of activated carbon fiber.

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