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

Abstract

The invention discloses a positive pressure control system exhaust valve for positive pressure explosion-proof equipment, and relates to the technical field of exhaust valves, the positive pressure control system exhaust valve comprises a valve body which comprises a valve cavity, an air inlet end, an air outlet end, a pressure relief assembly and an opening and closing assembly; the pressure relief assembly comprises a filter plate, a channel, a magnetic suction plate and a valve plate; the opening and closing assembly comprises a left opening and closing piece, a right opening and closing piece and two sets of reset pieces. The opening and closing states of the left opening and closing piece and the right opening and closing piece are automatically adjusted according to the actual airflow situation, and it is ensured that the system can effectively operate at different airflow speeds. Particularly, under the condition of high airflow speed, the right opening and closing piece is disconnected, the valve plate is turned over to increase the airflow passing rate, and pressure is released quickly. The valve plate can stably run in a high-pressure environment, the damage risk caused by high pressure is reduced, the oscillation problem caused by high-speed airflow is avoided, and the stability and durability of a system are improved.

Description

Technical Field

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

[0002] Positive pressure explosion-proofing prevents explosions by isolating combustible materials from ignition sources. For example, when a positive pressure explosion-proof distribution cabinet works in an inflammable and explosive environment, it usually opens the air inlet solenoid valve to fill the cabinet with clean air or inert gas, so that the air pressure inside the cabinet is greater than the external air pressure, so that the external inflammable and explosive mixed gas is not easy to enter the cabinet, avoiding contact with the electric sparks generated by the components in the cabinet during operation and causing explosions. However, when the air pressure in the cabinet exceeds the safety threshold, the exhaust valve will open to exhaust and maintain a stable air pressure.

[0003] Existing explosion-proof positive pressure cabinets are usually equipped with exhaust solenoid valves to prevent the internal pressure from exceeding the safety limit. This type of valve uses a spring and is fixed to the valve port by magnetic attraction. Although this design allows the spring to properly tilt up when the internal pressure increases to release excess pressure, in the face of extremely high internal pressure, the spring may be unable to reset due to excessive tilting. In addition, even when the spring is tilting, part of its structure may still block the valve port, hindering the rapid exhaust process, and the spring vibration caused by the high-speed airflow 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 is that the spring of the existing exhaust solenoid valve has a slow pressure release under extremely high internal pressure and is not conducive to improving explosion-proof safety.

[0005] The above technical problem is solved by the following technical solution: The present invention proposes a positive pressure control system exhaust valve for positive pressure explosion-proof equipment, which includes a valve body, including a valve cavity, an air inlet end arranged at one end of the valve cavity, an air 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; The pressure relief assembly includes a filter plate disposed on the inner end surface of the air inlet end, a channel disposed on the filter plate, a magnetic plate disposed at the inner port of the channel, and a valve plate disposed on the inner end surface of the magnetic plate; The opening and closing assembly comprises a left opening and closing member arranged on one side of the valve plate, a right opening and closing member arranged on the other side of the valve plate, and two groups of reset members arranged on the inner side of the valve cavity.

[0006] In a preferred embodiment of the positive pressure control system exhaust valve for positive pressure explosion-proof equipment described in the present invention: it also includes a detection unit, including a shell cover arranged at the end of the valve body, an L-shaped plate arranged on the outside of the shell cover, an air pressure detection module arranged on the inside of the shell cover, and a sealing ring arranged between the shell cover and the valve body.

[0007] In a preferred embodiment of the positive pressure control system exhaust valve for positive pressure explosion-proof equipment of the present invention: The valve plate comprises a reinforcing rib embedded in the surface of the valve plate, and two groups of connecting rods protruding from both sides of the reinforcing rib.

[0008] In a preferred embodiment of the positive pressure control system exhaust valve for positive pressure explosion-proof equipment of 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 the slot; One end of the slot is formed into a diagonal support surface.

[0009] In a preferred embodiment of the positive pressure control system exhaust valve for positive pressure explosion-proof equipment of the present invention: the first rotating part includes a turntable hinged to the limit rod, and a gear ring protruding from the circumference of the turntable.

[0010] In a preferred embodiment of the positive pressure control system exhaust valve for positive pressure explosion-proof equipment of the present invention: the hinged end includes a hinged groove opened on its end surface; The hinge groove is hinged to one of the connecting rods.

[0011] In a preferred embodiment of the positive pressure control system exhaust valve for positive pressure explosion-proof equipment of the present invention: The reset member includes a rack meshed with the bottom of the rotating disk, and a long spring arranged at the rear end of the rack; 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 slotted side wall.

[0012] In a preferred embodiment of the positive pressure control system exhaust valve for positive pressure explosion-proof equipment described in the present invention: the limiting portion includes a slide groove opened at its end, a limiting ring slidably arranged on the inner side of the slide 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.

[0013] In a preferred embodiment of the positive pressure control system exhaust valve for positive pressure explosion-proof equipment of the present invention: One end of the limiting ring is provided with an inclined surface, and the inclined surface is slidably matched with the connecting rod.

[0014] The beneficial effect of the present invention is that the left and right opening and closing parts of the device automatically adjust the opening and closing states according to the actual airflow conditions, ensuring that the system can operate effectively at different airflow speeds. In particular, under high airflow speed conditions, the right opening and closing part is disconnected, causing the valve plate to flip over to increase the airflow rate and quickly release pressure. This allows the valve plate to operate stably under high-pressure environments, reduces the risk of damage caused by high pressure, avoids oscillation problems caused by high-speed airflow, and improves the stability and durability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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 are briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the present invention, but are not intended to limit the present invention. Among them: Figure 1 The overall structural schematic diagram of the positive pressure control system exhaust valve for positive pressure explosion-proof equipment of the present invention is shown; Figure 2 A partial cross-sectional structural schematic diagram of an exhaust valve of a positive pressure control system for positive pressure explosion-proof equipment according to the present invention is shown; Figure 3 It shows a schematic diagram of the structure of the pressure relief assembly and the opening and closing assembly of the present invention after opening; Figure 4 It shows a schematic diagram of the structure of the pressure relief assembly and the opening and closing assembly of the present invention after closing; Figure 5 A schematic diagram of the structure of the right opening and closing member of the present invention is shown; Figure 6 Shows Figure 4 An enlarged schematic diagram of the limiter structure at position A in FIG. Figure 7 The diagram shows the operation process of the pressure relief assembly and the opening and closing assembly of the present invention.

[0016] In the figure: 1, valve body; 2, detection unit; 11, valve cavity; 12, air inlet end; 13, air outlet end; 14, pressure relief assembly; 15, opening and closing assembly; 21, shell cover; 22, L-shaped plate; 23, air pressure detection module; 24, sealing ring; 31, limit rod; 111, slot; 141, filter plate; 142, channel; 143, magnetic plate; 144, valve plate; 151, left opening and closing member; 152, right opening and closing member; 153, reset member; 1111, Diagonal support surface; 1441, reinforcing ribs; 1442, connecting rod; 1511, first rotating part; 1512, hinged 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 rope; 152221, inclined plane. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with specific implementation methods and drawings.

[0018] The terms used in the present invention are those general terms currently widely used in the art in consideration of the functions of the present invention, but these terms may vary according to the intention of a person 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 rather as a general description based on the meaning of the terms and the present invention.

[0019] Reference Figure 1 to Figure 7 , the present embodiment provides a positive pressure control system exhaust valve for positive pressure explosion-proof equipment, comprising a valve body 1, including a valve chamber 11, an air inlet end 12 disposed at one end of the valve chamber 11, an air outlet end 13 disposed at the other end of the valve chamber 11, a pressure relief component 14 disposed inside the valve chamber 11, and an opening and closing component 15 disposed at one end of the pressure relief component 14; The pressure relief assembly 14 includes a filter plate 141 disposed on the inner end surface of the air inlet end 12, a channel 142 disposed on the filter plate 141, a magnetic attraction plate 143 disposed at the inner port of the channel 142, and a valve plate 144 disposed on the inner end surface of the magnetic attraction plate 143; The opening and closing assembly 15 includes a left opening and closing member 151 disposed on one side of the valve plate 144 , a right opening and closing member 152 disposed on the other side of the valve plate 144 , and two sets of restoring members 153 disposed inside the valve cavity 11 .

[0020] In this embodiment, the air inlet end 12 of the valve body 1 is connected to the inside of the positive pressure explosion-proof device, and the airflow enters the valve cavity 11 through the air inlet end 12, and finally is discharged to the atmosphere through the air 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 and controllably discharge the gas inside the positive pressure explosion-proof device to the atmosphere, and at the same time prevents potential dangerous gases from the outside from entering the cabinet, thereby ensuring the safe operation of the entire system.

[0021] It should be noted that a pressure relief component 14 and an opening and closing component 15 are installed at the inner valve port of the air inlet end 12, and the opening and closing component 15 controls the degree of airflow inflow from the air inlet end 11 by controlling the opening and closing degree of the pressure relief component 14. This design allows the system to adjust the flow rate of the airflow according to actual needs, which not only ensures the normal introduction of gas, but also controls the flow rate of gas by adjusting the opening and closing degree when necessary, thereby achieving the purpose of safe pressure relief.

[0022] Specifically, the through hole of the air inlet end 12 is in the shape of a circular hole, and a group of filter plates 141 are clamped on the aperture of the channel 142 on the inner side of the air inlet end 12, and a magnetic plate 143 is threadedly fixedly connected to the inner end face of the channel 142. The magnetic plate 143 is fixedly connected to the valve cavity 11 at four corners by bolts, and the magnetic plate 143 is a metal magnetic plate. A through groove is provided through the position of the magnetic plate 143 facing the air inlet end 12 to facilitate the normal inflow and outflow of air. A group of valve plates 144 are magnetically attracted to the back of the magnetic plate 143. This design not only ensures the smooth passage of airflow, but also realizes precise control of airflow through the cooperation of the magnetic plate 143 and the valve plate 144.

[0023] After the positive valve body 1 is installed, the valve plate 144 will present two different working modes according to the changes in the air pressure in the positive pressure cabinet cavity. In the first working mode, the air pressure in the positive pressure chamber has not exceeded the set threshold value. At this time, the valve plate 144 is attracted by the magnetic plate 143 and covers the entrance of the air inlet end 12. Therefore, the explosion-proof positive pressure cabinet does not need to perform exhaust and pressure relief operations. In the second working mode, the air pressure in the positive pressure chamber exceeds the threshold value, and the force of the air pressure causes the valve plate 144 to be at least partially pushed open. The higher the air pressure in the positive pressure chamber, the larger the range of pushing open. The gas is exhausted and pressure relieved through the air flow inlet in the cabinet, thereby effectively preventing potential dangers caused by excessive pressure.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] In this embodiment, the valve plate 144 is made of a magnetic metal material, and a reinforcing rib 1441 is embedded in its surface, and two groups of connecting rods 1442 are protruded at both ends of the reinforcing rib 1441; the reinforcing rib 1441 can increase the toughness of the valve plate 144 to cope with stronger pressure, and the connecting rods 1442 on both sides of the reinforcing rib 1441, one connecting rod 1442 is hinged to the left opening and closing part 151, and the other group of connecting rods 1442 is slidingly connected to the right opening and closing part 152, after the connecting rod 1442 is disconnected from the right opening and closing part 152, the left opening and closing part 151 is rotatably connected to the other group of connecting rods 1442.

[0030] In one embodiment provided in the present application, the left opening and closing member 151 includes a first rotating portion 1511 and a hinge end 1512 protruding from one end of the first rotating portion 1511; 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 .

[0031] In an embodiment provided in 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 and disposed in the slot 111; One end of the slot 111 is formed as a diagonal support surface 1111 .

[0032] The first rotating portion 1511 includes a rotating disk 15111 hinged to the limiting rod 31 and a gear ring 15112 protruding from the circumference of the rotating disk.

[0033] In this embodiment, two groups of symmetrical slots 111 are provided through the inner side of the valve cavity 11, and the slots 111 provide space for installing the right opening and closing member 152 and the left opening and closing member 151. 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; and the right opening and closing member 152 is composed of a second rotating portion 1521 and a stopper 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 stopper 1522 have different structures.

[0034] Specifically, the first rotating part 1511 is composed of a rotating disk 15111 and a gear ring 15112 protruding from the peripheral side of the rotating disk 15111. An axial hole is provided at the axis of the rotating disk 15111, so that the right opening and closing member 152 and the left opening and closing member 151 are preset at the designated position from the two groups of slots 111 on one side of the valve cavity 11 during the installation process, and the limiting rod 31 passes through from the outside of the valve body 1 to the inside of the valve cavity 11, so as to limit the axis of the rotating disk 15111 at the predetermined position. In addition, the second rotating part 1521 is also limited at the predetermined position by the limiting rod 31.

[0035] Preferably, the first rotating part 1511 is as follows Figure 5 The shape shown has a straight edge on one side and a beveled edge on the other side. When the air pressure in the positive pressure chamber has not exceeded the set threshold value, the valve plate 144 fits on the magnetic plate 143. At this time, the hinged end 1512 protruding in the straight edge direction of the first rotating part 1511 is connected to the valve plate 144 by a hinged manner, so that it can just fit horizontally on the end face of the magnetic plate 143; and the beveled edge of the first rotating part 1511 fits with the diagonal support surface 1111 on the inner side of the groove 111, which can increase the stability of the valve plate 144 when it fits. Similarly, when the air pressure in the positive pressure chamber has not exceeded the set threshold value, the right opening and closing member 152 maintains a parallel relationship with the left opening and closing member 151, and jointly maintains the valve plate 144 horizontally fitting on the magnetic plate 143.

[0036] In one embodiment provided in the present application, the hinge end 1512 includes a hinge groove 15121 opened on its end surface; The hinge slot 15121 is hinged to a connecting rod 1442 .

[0037] In one embodiment provided in the present application, the reset member 153 includes a rack 1531 meshed with the bottom of the rotating disk 15111, and a long spring 1532 disposed 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 .

[0038] In this embodiment, the front end of the hinge end 1512 is provided with a hinge groove 15121, and the hinge groove 15121 can be hinged with the connecting rod 1442. An irregular gear ring 15112 is arranged on the peripheral side of the rotating disk 15111, and the gear ring can drive the reset member 153 to move. When the air pressure in the positive pressure chamber is not restored to a value lower than the set threshold, the reset member 153 causes the left opening and closing member 151 and the right opening and closing member 152 to reset.

[0039] The reset member 153 includes a rack 1531 slidably disposed 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 airflow will lift the valve plate 144 to flip, and during the flipping process of the valve plate 144, the left opening and closing member 151 and the right opening and closing member 152 on both sides will be driven to deflect, thereby causing the rack 1531 at the bottom of the two to slide, and finally squeeze the long spring 1532, thereby preventing the conventional valve plate from vibrating due to the airflow and causing damage to the valve plate.

[0040] 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 is restored, the long spring 1532 rebounds and drives the rack 1531 to reset, and drives the opening and closing component 15 to return to its original 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 the irreversible damage caused by plastic deformation. The hinged structure converts the movement of the valve plate 144 into a stable rotational motion rather than free vibration, which can achieve the effect of suppressing airflow oscillation.

[0041] Reference Figure 2 to Figure 7 In some embodiments, the limiting portion 1522 includes a slide groove 15221 opened at its end, a limiting ring 15222 slidably arranged on the inner side of the slide 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.

[0042] As an optional embodiment, one end of the limiting ring 15222 is formed into an inclined surface 152221 , and the inclined surface 152221 is slidably matched with the connecting rod 1442 .

[0043] In this embodiment, the limiter 1522 and the hinged end 1512 are both connected to the connecting rods 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, the limiter 1522 will disconnect from the connecting rod 1442, so that the valve plate 144 is in a single-side hinged state, and then under the action of the airflow, the valve port will no longer be blocked, so that rapid exhaust can be achieved.

[0044] Specifically, compared with the hinged end 1512, the limiting portion 1522 is provided with a sliding groove 15221 on its end surface, so that the limiting ring 15222 inside the sliding groove 15221 can slide forward and backward, thereby disconnecting the connection with the connecting rod 1442. A group of short springs 15223 are fixedly connected between the limiting ring 15222 and the end surface of the sliding groove 15221, and the short springs 15223 have the function of allowing the connecting rod 1442 and the limiting ring 15222 to be sleeved together again. A group of thin ropes 15224 are fixedly connected to one side of the limiting ring 15222. The thin ropes 15224 are wrapped around the second rotating part 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 part 1521, so as to ensure that after the valve plate 144 is flipped upward, the turntable 15111 can drive the rack 1531 to slide, and the limiting ring 15222 can be displaced through the thin ropes 15224.

[0045] like Figure 7 The valve plate 144 is shown in the operating state under different pressure thresholds in the positive pressure chamber. When the pressure in the positive pressure chamber has not exceeded the set threshold, the valve plate 144 is attracted by the magnetic plate 143 and covers the entrance of the air inlet end 12. The left opening and closing member 151 and the right opening and closing member 152 do not move, so the explosion-proof positive pressure cabinet does not need to perform exhaust and pressure relief operations.

[0046] When the air pressure in the positive pressure chamber exceeds the set threshold, the valve plate 144 breaks through the adsorption effect of the magnetic plate 143 and begins to flip upward, so that the left opening and closing member 151 and the right opening and closing member 152 move at the same time, causing the turntable 15111 at the bottom of each of them to drive the rack 1531 to slide, compressing the long spring 1532, and converting the original elastic opening and closing of the valve plate into a more stable hinge, thereby avoiding the problem of valve plate damage caused by conventional valve plate pressure feet and shock caused by airflow.

[0047] When the air pressure in the positive pressure chamber exceeds the set limit, the valve plate 144 tilts up at a greater angle, so that the rack 1531 at the bottom of the right opening and closing member 152 slides, and the thin rope 15224 pulls the limit ring 15222 to cause a large displacement, and the limit ring 15222 is no longer connected to the connecting rod 1442, so that the valve plate 144 is in a single-sided hinged state, and then it will flip to one side under the action of the airflow until it no longer blocks the valve port, achieving the effect of rapid exhaust and explosion prevention. In addition, when the air pressure returns to normal, the valve plate 144 begins to fall in the valve chamber 11 due to gravity, and finally slides with the limit ring 152221 at one end of the limit ring 15222, and is again connected with the limit ring 15222, and the valve plate 144 covers the entrance of the air inlet end 12.

[0048] In summary, the left opening and closing member 151 and the right opening and closing member 152 of the device can automatically adjust their opening and closing degrees according to the actual airflow conditions. When the internal pressure exceeds the threshold, the right opening and closing member 152 is disconnected from the connecting rod 1442 of the valve plate 144, and the valve plate 144 is flipped only 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 airflow can be discharged without obstruction. Rapid pressure relief is achieved. 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 side connection is disconnected, and the left hinge point still maintains structural rigidity to prevent the valve plate from tearing due to excessive flipping.

[0049] Finally, it should be pointed out that the methods and devices described in detail above are only embodiments, and those skilled in the art can modify these embodiments in different ways without departing 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 cavity (11), an air inlet end (12) arranged at one end of the valve cavity (11), an air outlet end (13) arranged at the other end of the valve cavity (11), a pressure relief component (14) arranged inside the valve cavity (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 groups of reset members (153) arranged inside the valve cavity (11).

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 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).

4. The positive pressure control system exhaust valve for positive pressure explosion-proof equipment according to claim 3, characterized in that: 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).

5. The positive pressure control system exhaust valve for positive pressure explosion-proof equipment according to claim 4, characterized in that: The first rotating part (1511) and the second rotating part (1521) have the same structure, and are respectively penetrated by a limiting rod (31) and arranged in the slot (111); One end of the slot (111) is formed into a diagonal support surface (1111).

6. The positive pressure control system exhaust valve for positive pressure explosion-proof equipment according to claim 5, characterized in that: 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).

7. The positive pressure control system exhaust valve for positive pressure explosion-proof equipment according to claim 6, characterized in that: The hinged end (1512) comprises a hinged groove (15121) formed on an end surface of the hinged end (1512); Furthermore, the hinge groove (15121) is hingedly connected to one of the connecting rods (1442).

8. The positive pressure control system exhaust valve for positive pressure explosion-proof equipment according to claim 6, characterized in that: 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).

9. The positive pressure control system exhaust valve for positive pressure explosion-proof equipment according to claim 8, characterized in that: The limiting portion (1522) comprises a sliding groove (15221) opened at the end of the limiting portion (1522), a limiting ring (15222) slidably arranged on the inner side of 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).

10. The positive pressure control system exhaust valve for positive pressure explosion-proof equipment according to claim 9, 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).

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