A positive pressure control system exhaust valve for positive pressure explosion-proof equipment

Abstract

The present invention discloses a positive pressure control system exhaust valve for positive pressure explosion-proof equipment, which relates to the technical field of exhaust valves and includes a valve body, including a valve cavity, an air inlet end, an air outlet end, a pressure relief component, and an opening and closing component; the pressure relief component includes a filter plate, a channel, a magnetic attraction plate, and a valve piece; the opening and closing component includes a left opening and closing piece, a right opening and closing piece, and two groups of reset pieces. In this device, the left opening and closing piece and the right opening and closing piece automatically adjust the opening and closing states according to the actual situation of the air flow, ensuring that the system can operate effectively at different air flow speeds. Especially in the case of high air flow speed, the right opening and closing piece disconnects, causing the valve piece to flip and expand the air flow passing rate, quickly relieving pressure. This enables the valve piece to operate stably in a high-pressure environment, reducing the risk of damage caused by high pressure, avoiding the oscillation problem caused by high-speed air flow, and improving the stability and durability of the system.

Description

Technical Field

[0001] The present invention relates to the field of exhaust valves, and in particular to a positive pressure control system exhaust valve for positive pressure explosion-proof equipment. Background Art

[0002] Positive pressure explosion protection prevents explosion by isolating combustible substances from ignition sources. For example, when a positive pressure explosion-proof distribution cabinet operates in a flammable and explosive environment, it usually fills clean air or inert gas into the cabinet by opening an intake solenoid valve, so that the air pressure inside the cabinet is greater than the external air pressure, thereby making it difficult for the external flammable and explosive mixed gas to enter the cabinet, avoiding contact with the electric sparks generated by the components inside the cabinet during operation and thus preventing explosion. However, when the air pressure inside the cabinet exceeds the safety threshold, the exhaust valve will open to exhaust gas to maintain a stable air pressure.

[0003] Existing explosion-proof positive pressure cabinets usually are equipped with exhaust solenoid valves to prevent the internal pressure from exceeding the safety limit. Such valve plates use elastic sheets and are fixed at the valve orifice position by magnetic attraction. Although this design allows the elastic sheet to tilt appropriately to release excess pressure when the internal pressure increases, in the face of extremely high internal pressure, the elastic sheet may not be able to reset due to excessive tilting. In addition, even during the tilting process of the elastic sheet, part of its structure may still block the valve orifice, hindering the rapid exhaust process, and the oscillation of the elastic sheet caused by the high-speed air flow further reduces the exhaust efficiency, which is not conducive to improving explosion-proof safety. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention lies in: the problem that the elastic sheet of the existing exhaust solenoid valve has a slow pressure relief and is not conducive to improving explosion-proof safety in the face of extremely high internal pressure.

[0005] The above technical problem is solved by the following technical solutions: The present invention provides a positive pressure control system exhaust valve for positive pressure explosion-proof equipment, which includes a valve body, comprising a valve cavity, an intake end arranged at one end of the valve cavity, an outlet end arranged at the other end of the valve cavity, a pressure relief component arranged inside the valve cavity, and an opening and closing component arranged at one end of the pressure relief component;

[0006] The pressure relief component includes a filter plate arranged on the inner end face of the intake end, a channel arranged on one side of the filter plate, a magnetic attraction plate arranged at the inner port of the channel, and a valve sheet arranged on the inner end face of the magnetic attraction plate;

[0007] The opening and closing component includes a left opening and closing member arranged on one side of the valve sheet, a right opening and closing member arranged on the other side of the valve sheet, and two groups of reset members arranged inside the valve cavity.

[0008] In a preferred embodiment of the positive pressure control system exhaust valve for positive pressure explosion-proof equipment according to the present invention: It further includes a detection unit, which includes a shell cover arranged at the end of the valve body, an L-shaped plate arranged outside the shell cover, a gas pressure detection module arranged inside the shell cover, and a sealing ring arranged between the shell cover and the valve body.

[0009] In a preferred embodiment of the positive pressure control system exhaust valve for positive pressure explosion-proof equipment according to the present invention:

[0010] The valve piece includes reinforcing ribs embedded in the surface of the valve piece, and two groups of connecting rods protruding from both sides of the reinforcing ribs.

[0011] In a preferred embodiment of the positive pressure control system exhaust valve for positive pressure explosion-proof equipment according to the present invention: The first rotating part and the second rotating part have the same structure, and are respectively penetrated by a limiting rod and arranged in a slotted groove;

[0012] One end of the slotted groove is provided with an inclined support surface.

[0013] In a preferred embodiment of the positive pressure control system exhaust valve for positive pressure explosion-proof equipment according to the present invention: The first rotating part includes a turntable hinged to the limiting rod, and a gear ring protruding from the circumferential side of the turntable.

[0014] In a preferred embodiment of the positive pressure control system exhaust valve for positive pressure explosion-proof equipment according to the present invention: The hinged end includes a hinged groove opened on its end face;

[0015] And the hinged groove is hinged to one of the connecting rods.

[0016] In a preferred embodiment of the positive pressure control system exhaust valve for positive pressure explosion-proof equipment according to the present invention:

[0017] The reset member includes a rack meshed at the bottom of the turntable, and a long spring arranged at the rear end of the rack;

[0018] The gear ring is an irregular gear, and one side of the long spring is fixedly connected to the rack, and the other side is fixedly connected to the side wall of the slotted groove.

[0019] In a preferred embodiment of the positive pressure control system exhaust valve for positive pressure explosion-proof equipment according to the present invention: The limiting part includes a sliding groove opened at its end, a limiting ring slidably arranged inside the sliding groove, a short spring arranged on one side of the limiting ring, and a thin rope arranged on the other side of the limiting ring.

[0020] In a preferred embodiment of the positive pressure control system exhaust valve for positive pressure explosion-proof equipment according to the present invention:

[0021] One end of the limiting ring is provided with an inclined surface, and the inclined surface is slidably matched with the connecting rod.

[0022] The beneficial effects of the present invention are as follows: In this device, the left opening and closing member and the right opening and closing member automatically adjust the opening and closing states according to the actual situation of the airflow, ensuring that the system can operate effectively at different airflow speeds. Especially in the case of high airflow speed, the right opening and closing member disconnects, causing the valve plate to flip to expand the airflow passing rate and quickly relieve pressure. This enables the valve plate to operate stably in a high-pressure environment, reducing the risk of damage caused by high pressure, avoiding the oscillation problem caused by high-speed airflow, and improving the stability and durability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the present invention and do not limit the present invention. Among them:

[0024] Figure 1 Shows the overall structural schematic diagram of the positive pressure control system exhaust valve for positive pressure explosion-proof equipment of the present invention;

[0025] Figure 2 Shows the partial cross-sectional structural schematic diagram of the positive pressure control system exhaust valve for positive pressure explosion-proof equipment of the present invention;

[0026] Figure 3 Shows the structural schematic diagram after the pressure relief component and the opening and closing component of the present invention are opened;

[0027] Figure 4 Shows the structural schematic diagram after the pressure relief component and the opening and closing component of the present invention are closed;

[0028] Figure 5 Shows the structural schematic diagram of the right opening and closing member of the present invention;

[0029] Figure 6 Shows Figure 4 The enlarged schematic diagram of the limiting part structure at A in

[0030] Figure 7 Shows the operation process diagram of the pressure relief component and the opening and closing component of the present invention.

[0031] In the figure: 1. Valve body; 2. Detection unit; 11. Valve cavity; 12. Intake end; 13. Outlet end; 14. Pressure relief component; 15. Opening and closing component; 21. Shell cover; 22. L-shaped plate; 23. Air pressure detection module; 24. Sealing ring; 31. Limit rod; 111. Groove; 141. Filter plate; 142. Channel; 143. Magnetic attraction plate; 144. Valve plate; 151. Left opening and closing part; 152. Right opening and closing part; 153. Reset part; 1111. Inclined support surface; 1441. Reinforcing rib; 1442. Connecting rod; 1511. First rotating part; 1512. Hinge end; 1521. Second rotating part; 1522. Limiting part; 1531. Rack; 1532. Long spring; 15111. Turntable; 15112. Gear ring; 15121. Hinge groove; 115221. Slide groove; 15222. Limiting ring; 15223. Short spring; 15224. Thin string; 152221. Inclined surface. Detailed implementation manners

[0032] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below in conjunction with the detailed implementation manners and the accompanying drawings.

[0033] The terms used in the present invention are those general terms that are currently widely used in the art in consideration of the functions of the present invention. However, these terms may change according to the intentions of those of ordinary skill in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in this case, their detailed meanings will be described in the detailed description of the present invention. Therefore, the terms used in the specification should not be understood as simple names, but based on the meanings of the terms and the overall description of the present invention.

[0034] Referring to Figures 1 to 7 , this embodiment provides a positive pressure control system exhaust valve for positive pressure explosion-proof equipment, including a valve body 1, including a valve cavity 11, an intake end 12 provided at one end of the valve cavity 11, an outlet end 13 provided at the other end of the valve cavity 11, a pressure relief component 14 provided inside the valve cavity 11, and an opening and closing component 15 provided at one end of the pressure relief component 14;

[0035] The pressure relief component 14 includes a filter plate 141 provided on the inner end face of the intake end 12, a channel 142 provided on the filter plate 141, a magnetic attraction plate 143 provided at the inner port of the channel 142, and a valve plate 144 provided on the inner end face of the magnetic attraction plate 143;

[0036] The opening and closing component 15 includes a left opening and closing part 151 provided on one side of the valve plate 144, a right opening and closing part 152 provided on the other side of the valve plate 144, and two groups of reset parts 153 provided inside the valve cavity 11.

[0037] In this embodiment, the intake end 12 of the valve body 1 is connected and communicated with the inside of the positive pressure explosion-proof device. The air flow enters the valve cavity 11 through the intake end 12 and finally is discharged to the atmosphere through the outlet end 13, while the inside of the valve cavity 11 is sealed. This design ensures that under normal working conditions, the valve body 1 can effectively discharge the gas inside the positive pressure explosion-proof device to the atmosphere in a controlled manner, while preventing potential dangerous gases from the outside from entering the cabinet, thus ensuring the safe operation of the entire system.

[0038] It should be particularly noted that a pressure relief component 14 and an opening and closing component 15 are installed at the inner valve port of the intake end 12. The opening and closing component 15 controls the degree of opening and closing of the pressure relief component 14, thereby controlling the degree of air flow influx at the intake end 11. This design enables the system to adjust the air flow rate according to actual needs, ensuring both the normal introduction of gas and the control of the gas flow rate by adjusting the opening degree when necessary, so as to achieve the purpose of safe pressure relief.

[0039] Specifically, the through hole of the intake end 12 is circular, and a set of filter plates 141 is clamped on the inner diameter of the channel 142 at the inner side of the intake end 12. A magnetic attraction plate 143 is fixedly connected by threads on the inner end face of the channel 142. The magnetic attraction plate 143 is fixedly connected to the valve cavity 11 by bolts at the four corners. The magnetic attraction plate 143 is a metal magnetic attraction plate, and a through groove is formed through the position of the magnetic attraction plate 143 facing the intake end 12 to facilitate the normal entry and exit of air flow. A set of valve plates 144 is magnetically attracted to the back of the magnetic attraction plate 143. This design not only ensures the smooth passage of air flow, but also realizes the precise control of air flow through the cooperation of the magnetic attraction plate 143 and the valve plates 144.

[0040] After installing the positive valve body 1, the valve plates 144 will present two different working modes according to the air pressure change in the positive pressure cabinet cavity. In the first working mode, the air pressure in the positive pressure cavity has not exceeded the set threshold value. At this time, the valve plates 144 are attracted by the magnetic attraction plate 143 and cover the entrance of the intake end 12. Therefore, the explosion-proof positive pressure cabinet does not need to perform exhaust pressure relief operations. In the second working mode, the air pressure in the positive pressure cavity exceeds the threshold value. The force of the air pressure causes the valve plates 144 to be at least partially pushed open. The higher the air pressure in the positive pressure cavity, the larger the pushed-open range. The gas is exhausted and pressure-relieved through the air flow inlet in the cabinet, effectively preventing potential dangers caused by excessive pressure.

[0041] In this embodiment, a left opening and closing member 151 is provided on one side of the valve plate 144, and a right opening and closing member 152 is provided on the other side; the left opening and closing member 151 is hinged to the valve plate 144, and the right opening and closing member 152 is slidably connected to the valve plate 144. When the airflow velocity is relatively high, the right opening and closing member 152 will be disconnected from the valve plate 144, causing it to flip to one side, thereby increasing the airflow rate, quickly exhausting and relieving pressure, and meeting the explosion-proof requirements; when the airflow velocity decreases, the reset member 153 at the bottom of the left opening and closing member 151 and the right opening and closing member 152 operates, causing the right opening and closing member 152 to close again with the valve plate 144, and the valve plate 144 is attracted by the magnetic suction plate 143 and covers the entrance of the air inlet end 12. This design enables the system to automatically adjust the opening and closing state according to the actual airflow conditions, which not only ensures the safety of the system, but also improves the response speed and efficiency of the system.

[0042] In addition, the present embodiment further includes a detection unit 2, including a shell cover 21 disposed at the end of the valve body 1, an L-shaped plate 22 disposed on the outside of the shell cover 21, an air pressure detection module 23 disposed on the inside of the shell cover 21, and a sealing ring 24 disposed between the shell cover 21 and the valve body 1. The function of the detection unit 2 is to monitor the air pressure in the explosion-proof positive pressure cabinet in real time to ensure that the air pressure in the cabinet is kept within a safe range.

[0043] In this embodiment, the detection unit 2 includes a plurality of air pressure detection modules 23 for detecting the air pressure in the cabinet, and the shell cover 21 has a signal transmission interface with the air pressure detection module 23. A set of sealing rings 24 are embedded between the shell cover 21 and the valve body 1 to ensure the sealing arrangement between the shell cover 21 and the valve body 1, that is, the inner cavity of the valve body 1 forms a sealed cavity, which is two independent cavities with the shell cover 21. One side of the L-shaped plate 22 is fixedly connected to the bottom of the valve body 1, and the other side is connected to the shell cover 21 and the side of the valve body 1. This design not only ensures the sealing of the detection unit 2, but also facilitates installation and maintenance.

[0044] When the shell cover 21 and the valve body 1 are installed on the side wall of the explosion-proof positive pressure cabinet, it is only necessary to open an air vent and an air pressure detection port in the cabinet on the side wall of the explosion-proof positive pressure cabinet. When fixed, the air vent is connected to the air inlet end 12, and the air pressure detection port in the cabinet is connected to the air pressure detection module 23. While the pressure can be vented and explosion-proof, the air pressure in the cabinet can also be monitored in real time. This design enables the explosion-proof positive pressure cabinet to not only have the function of safe pressure relief, but also monitor the air pressure status in the cabinet in real time to ensure the safe and stable operation of the entire system.

[0045] Reference Figure 2 and Figure 6 As an optional embodiment, the valve plate 144 includes a reinforcing rib 1441 embedded in the surface of the valve plate, and two groups of connecting rods 1442 protruding from both sides of the reinforcing rib 1441.

[0046] In this embodiment, the valve plate 144 is made of magnetically attractable metal material, and reinforcing ribs 1441 are embedded on its surface. Two sets of connecting rods 1442 protrude from both ends of the reinforcing ribs 1441. The reinforcing ribs 1441 can increase the toughness of the valve plate 144 to withstand stronger pressure. One of the connecting rods 1442 on both sides of the reinforcing ribs 1441 is hinged to the left opening and closing member 151, and the other set of connecting rods 1442 is slidably connected to the right opening and closing member 152. After the connecting rod 1442 is disconnected from the right opening and closing member 152, the left opening and closing member 151 is rotatably connected to the other set of connecting rods 1442.

[0047] In an embodiment provided by the present application, the left opening and closing member 151 includes a first rotating portion 1511 and a hinged end 1512 protruding from one end of the first rotating portion 1511.

[0048] The right opening and closing member 152 includes a second rotating portion 1521 and a limiting portion 1522 protruding from one end of the second rotating portion 1521.

[0049] In an embodiment provided by the present application, the first rotating portion 1511 and the second rotating portion 1521 have the same structure and are respectively penetrated by the limiting rod 31 in the slotted opening 111.

[0050] One end of the slotted opening 111 is provided with an inclined support surface 1111.

[0051] The first rotating portion 1511 includes a turntable 15111 hinged to the limiting rod 31 and a gear ring 15112 protruding from the periphery of the turntable.

[0052] In this embodiment, two sets of symmetrical slotted openings 111 are penetrated in the inner side of the valve cavity 11. The slotted openings 111 provide space for installing the right opening and closing member 152 and the left opening and closing member 151. Among them, the left opening and closing member 151 is composed of a first rotating portion 1511 and a hinged end 1512 protruding from its front end; while the right opening and closing member 152 is composed of a second rotating portion 1521 and a limiting portion 1522 protruding from its front end. The first rotating portion 1511 and the second rotating portion 1521 have the same structure, but the hinged end 1512 and the limiting portion 1522 have different structures.

[0053] Specifically, the first rotating portion 1511 is composed of a turntable 15111 and a gear ring 15112 protruding from the periphery of the turntable 15111. A shaft hole is provided at the center of the turntable 15111, which is convenient for the right opening and closing member 152 and the left opening and closing member 151 to be preset at designated positions from two sets of slotted openings 111 on one side of the valve cavity 11 during the installation process, and the limiting rod 31 penetrates from the outside of the valve body 1 to the inside of the valve cavity 11 to limit the center of the turntable 15111 at a predetermined position. In addition, the second rotating portion 1521 is also restricted by the limiting rod 31 at a predetermined position.

[0054] Preferably, the first rotating part 1511 has a shape as shown in Figure 5 Figure, with one side being a straight edge and the other side being an inclined edge. When the air pressure in the positive pressure chamber has not exceeded the set threshold, the valve plate 144 fits on the magnetic attraction plate 143. At this time, the hinged end 1512 protruding in the direction of the straight edge of the first rotating part 1511 is connected to the valve plate 144 by a hinge, so that it can just horizontally fit on the end face of the magnetic attraction plate 143; and the inclined edge of the first rotating part 1511 fits with the inclined support surface 1111 inside the slot 111, which can increase the stability when the valve plate 144 fits. Similarly, when the air pressure in the positive pressure chamber has not exceeded the set threshold, the right opening and closing part 152 also maintains a parallel relationship with the left opening and closing part 151, jointly maintaining the valve plate 144 horizontally fitting on the magnetic attraction plate 143.

[0055] In an embodiment provided by the present application, the hinged end 1512 includes a hinged groove 15121 opened on its end face;

[0056] and the hinged groove 15121 is hinged with one of its connecting rods 1442.

[0057] In an embodiment provided by the present application, the reset member 153 includes a rack 1531 engaged at the bottom of the turntable 15111, and a long spring 1532 provided at the rear end of the rack 1531;

[0058] The toothed ring 15112 is an irregular gear, and one side of the long spring 1532 is fixedly connected to the rack 1531, and the other side is fixedly connected to the side wall of the slot 111.

[0059] In this embodiment, the front end of the hinged end 1512 is provided with a hinged groove 15121, and this hinged groove 15121 can be hinged with the connecting rod 1442. Irregular toothed rings 15112 are arrayed on the periphery of the turntable 15111, and the toothed rings can drive the reset member 153 to move. When the air pressure in the positive pressure chamber has not recovered to be lower than the set threshold, the reset member 153 causes the left opening and closing part 151 and the right opening and closing part 152 to reset.

[0060] Among them, the reset member 153 includes a rack 1531 slidably arranged at the bottom of the slot 111, and a long spring 1532 at the rear end of the rack 1531. When the air pressure in the positive pressure chamber exceeds the set threshold, the air flow will lift the valve plate 144 to flip. During the flipping process of the valve plate 144, it will drive the left opening and closing part 151 and the right opening and closing part 152 on both sides to deflect in angle, and then cause the racks 1531 at the bottoms of the two to slide, and finally squeeze the long spring 1532, thereby avoiding the valve plate from being damaged due to the oscillation caused by the air flow in the conventional valve plate.

[0061] In summary, when the valve plate 144 flips, the device can drive the rack 1531 to slide and compress the long spring 1532; when the pressure recovers, the long spring 1532 rebounds to drive the rack 1531 to reset, and drives the opening and closing assembly 15 to return to its position through gear transmission. The left opening and closing member 151 is connected to the valve plate 144 through the hinge end 1512, avoiding the elastic deformation dependence of the valve plate 144 and reducing irreversible damage caused by plastic deformation. The hinge structure converts the movement of the valve plate 144 into a stable rotational movement instead of free vibration, which can achieve the effect of suppressing air flow oscillation.

[0062] Referring to Figures 2 to 7 , in some embodiments, the limiting portion 1522 includes a chute 15221 opened at its end, a limiting ring 15222 slidably disposed inside the chute 15221, a short spring 15223 disposed on one side of the limiting ring 15222, and a thin string 15224 disposed on the other side of the limiting ring 15222.

[0063] As an alternative embodiment, one end of the limiting ring 15222 is formed as an inclined surface 152221, and the inclined surface 152221 is slidably engaged with the connecting rod 1442.

[0064] In this embodiment, both the limiting portion 1522 and the hinge end 1512 are connected to the connecting rod 1442 at both ends of the valve plate 144. However, the difference is that when the air pressure in the positive pressure chamber is much greater than the set threshold value, the limiting portion 1522 will disconnect from the connecting rod 1442, making the valve plate 144 in a single-sided hinged state. As a result, under the action of the air flow, it will no longer block the valve port and achieve rapid exhaust.

[0065] Specifically, compared with the hinge end 1512, the limiting portion 1522 has a chute 15221 opened on its end surface, so that the limiting ring 15222 inside the chute 15221 can slide back and forth, thereby disconnecting the connection relationship with the connecting rod 1442. A set of short springs 15223 are fixedly clamped between the limiting ring 15222 and the end surface of the chute 15221. The short springs 15223 have the function of reconnecting the connecting rod 1442 and the limiting ring 15222. And a set of thin strings 15224 are fixedly connected to one side of the limiting ring 15222. The thin strings 15224 are wrapped around the circumferential side of the second rotating portion 1521 of the right opening and closing member 152 and are finally fixedly connected to the rack 1531 at the bottom of the second rotating portion 1521, ensuring that after the valve plate 144 flips upward, the turntable 15111 can drive the rack 1531 to slide and displace the limiting ring 15222 through the thin strings 15224.

[0066] Such as Figure 7The operating state of the valve plate 144 shown under the air pressure thresholds in different positive pressure chambers. When the air pressure in the positive pressure chamber has not exceeded the set threshold, the valve plate 144 is attracted by the magnetic attraction plate 143 and covers the inlet of the air inlet end 12. Neither the left opening and closing member 151 nor the right opening and closing member 152 moves. Therefore, the explosion-proof positive pressure cabinet does not need to perform exhaust and pressure relief operations.

[0067] When the air pressure in the positive pressure chamber exceeds the set threshold, the valve plate 144 breaks through the adsorption effect restricted by the magnetic attraction plate 143 and begins to turn upward, so that the left opening and closing member 151 and the right opening and closing member 152 move simultaneously, and the turntable 15111 at their respective bottoms drives the rack 1531 to slide, compressing the long spring 1532, converting the original elastic opening and closing of the valve plate itself into a more secure hinge, thereby avoiding the problem of valve plate damage caused by the oscillation of the conventional valve plate foot and air flow.

[0068] When the air pressure in the positive pressure chamber exceeds the set limit, the valve plate 144 tilts at a greater angle, so that the rack 1531 at the bottom of the right opening and closing member 152 slides, causing the thin rope 15224 to pull the limit ring 15222 to have a large displacement. After that, the limit ring 15222 is no longer connected to the connecting rod 1442, and the valve plate 144 is in a single-sided hinge state. Then, under the action of the air flow, it will turn to one side until it no longer blocks the valve port, achieving the effect of rapid exhaust and explosion protection. In addition, when the air pressure returns to normal, the valve plate 144 begins to fall due to gravity in the valve cavity 11, and finally, through the sliding fit of the inclined surface 152221 at one end of the limit ring 15222, it is sleeved with the limit ring 15222 again, and the valve plate 144 covers the inlet of the air inlet end 12.

[0069] In summary, the left opening and closing member 151 and the right opening and closing member 152 of the present device can automatically adjust their opening and closing degrees according to the actual air flow conditions. When the internal pressure exceeds the threshold, the connecting rod 1442 between the right opening and closing member 152 and the valve plate 144 is disconnected, and the valve plate 144 only flips through the hinge point of the left opening and closing member 151. The valve plate 144 can be completely flipped to one side, no longer blocking the valve port, forming a fully open channel, and the air flow can be discharged without hindrance, achieving rapid pressure relief. This design effectively avoids the safety hazards caused by excessive internal pressure. In addition, at low pressure, the limit ring 15222 locks the valve plate 144 with the connecting rod 1442 through the short spring 15223; at high pressure, only the right connection is disconnected, and the left hinge point still maintains structural rigidity, avoiding the valve plate from being torn due to excessive flipping.

[0070] Finally, it should be pointed out that the methods and devices described in detail above are only examples, and those skilled in the art can modify these examples in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A positive pressure control system exhaust valve for positive pressure explosion-proof equipment, characterized in that: include, A valve body (1), comprising a valve chamber (11), an air inlet end (12) arranged at one end of the valve chamber (11), an air outlet end (13) arranged at the other end of the valve chamber (11), a pressure relief component (14) arranged inside the valve chamber (11), and an opening and closing component (15) arranged at one end of the pressure relief component (14); The pressure relief assembly (14) comprises a filter plate (141) arranged on the inner end surface of the air inlet end (12), a channel (142) arranged on one side of the filter plate (141), a magnetic attraction plate (143) arranged at the inner port of the channel (142), and a valve plate (144) arranged on the inner end surface of the magnetic attraction plate (143); The opening and closing assembly (15) comprises a left opening and closing member (151) arranged on one side of the valve plate (144), a right opening and closing member (152) arranged on the other side of the valve plate (144), and two sets of reset members (153) arranged inside the valve cavity (11); The left opening and closing member (151) comprises a first rotating portion (1511) and a hinged end (1512) protruding from one end of the first rotating portion (1511); The right opening and closing member (152) comprises a second rotating portion (1521) and a limiting portion (1522) protruding from one end of the second rotating portion (1521); The valve plate (144) comprises a reinforcing rib (1441) embedded in the surface of the valve plate (144), and two groups of connecting rods (1442) protruding from both sides of the reinforcing rib (1441); The hinged end (1512) is hingedly connected to one of the connecting rods (1442); The first rotating part (1511) and the second rotating part (1521) are respectively penetrated by a limiting rod (31) and arranged in the slot (111); The first rotating part (1511) comprises a rotating disk (15111) hingedly connected to the limiting rod (31), and a gear ring (15112) protruding from the circumference of the rotating disk (15111); The limiting rod (31) passes through the inner side of the valve cavity (11). Furthermore, the second rotating portion (1521) is also hinged to the axis of the limiting rod (31); The reset member (153) comprises a rack (1531) meshed with the bottom of the rotating disk (15111), and a long spring (1532) arranged at the rear end of the rack (1531); The gear ring (15112) is an irregular gear, and one side of the long spring (1532) is fixedly connected to the rack (1531), and the other side is fixedly connected to the side wall of the slot (111); The limiting portion (1522) comprises a sliding groove (15221) opened at the end of the limiting portion (1522), a limiting ring (15222) slidably arranged inside the sliding groove (15221), a short spring (15223) arranged on one side of the limiting ring (15222), and a thin rope (15224) arranged on the other side of the limiting ring (15222); The limiting ring (15222) is slidably matched with the connecting rod (1442).

2. The positive pressure control system exhaust valve for positive pressure explosion-proof equipment according to claim 1, characterized in that: It also comprises a detection unit (2), comprising a shell cover (21) arranged at the end of the valve body (1), an L-shaped plate (22) arranged on the outside of the shell cover (21), an air pressure detection module (23) arranged on the inside of the shell cover (21), and a sealing ring (24) arranged between the shell cover (21) and the valve body (1).

3. The positive pressure control system exhaust valve for positive pressure explosion-proof equipment according to claim 2, characterized in that: The first rotating part (1511) and the second rotating part (1521) have the same structure; One end of the slot (111) is formed into a diagonal support surface (1111).

4. The positive pressure control system exhaust valve for positive pressure explosion-proof equipment according to claim 3, characterized in that: The hinged end (1512) comprises a hinged groove (15121) opened on the end surface of the hinged end (1512).

5. The positive pressure control system exhaust valve for positive pressure explosion-proof equipment according to claim 4, characterized in that: One end of the limiting ring (15222) is provided with an inclined surface (152221), and the inclined surface (152221) is slidably matched with the connecting rod (1442).

Images