Fire-retardant vacuum pressure breather valve

Abstract

The invention discloses a fire-retardant vacuum pressure breather valve, and particularly relates to the technical field of breather valves, the fire-retardant vacuum pressure breather valve comprises a shell and further comprises an exhaust valve plate arranged in the shell, a buffer block is arranged above the exhaust valve plate, a piston cavity is formed in the buffer block, a damping cavity is formed in the outer side of the piston cavity, and the damping cavity is communicated with the exhaust valve plate. A piston part connected with the exhaust valve plate is arranged in the piston cavity, a one-way air inlet mechanism is arranged at the bottom of the piston cavity, a one-way exhaust mechanism is arranged on the side wall of the piston cavity and located below the piston part, and damping holes distributed in an array mode are formed in the outer side of the damping cavity. A temperature control shielding mechanism is arranged above the damping cavity and used for shielding the damping hole in a stepped mode, so that the moving speed of the exhaust valve plate driven by the piston part is in negative correlation with the temperature, the opening time of the exhaust valve plate can be adjusted according to the temperature, and the influence of mechanical abrasion or low-temperature freezing on the sensitivity of the valve body is reduced as much as possible.

Description

Technical Field

[0001] The present invention relates to the technical field of breathing valves, and more particularly to a fire-retardant vacuum pressure breathing valve. Background Art

[0002] The fire-arresting breathing valve is a safety device that integrates breathing regulation and fire-arresting functions. It is mainly used to control the gas pressure inside closed equipment such as storage tanks and containers, and prevent external flames or explosion waves from entering the equipment through the breathing channel, thereby ensuring the safe operation of the equipment. The breathing valve senses the pressure difference between the inside and outside of the equipment through the valve plate or diaphragm. When the pressure exceeds the set value, the valve disc opens to exhaust. When the pressure is lower than the set value, the valve disc opens to intake air. The breathing valve senses the pressure difference between the inside and outside of the equipment through the valve disc or diaphragm. When the pressure exceeds the set value, the valve disc opens to exhaust. When the pressure is lower than the set value, the valve disc opens to intake air. When the flame or explosion wave passes through the breathing valve, the tiny channel of the fire-arresting core splits the flame front into multiple small flames, and quickly reduces the flame temperature through heat conduction and the cooling effect of the wall, making it impossible to maintain combustion.

[0003] In the existing technology, although the breathing fire arrester can regulate pressure and prevent fire, under high-temperature conditions, the medium in the tank is heated and the volatilization effect is enhanced, causing the gas to expand thermally, resulting in a sharp rise in the pressure gradient. The thermal stress shortens the pressure threshold trigger cycle, causing the valve plate opening and closing frequency to increase abnormally. This unplanned reciprocating motion will aggravate the mechanical fatigue loss of the transmission mechanism, causing the valve response lag and the action sensitivity to attenuate. In the low-temperature operation scenario, when the breathing valve performs the pressure regulation function, the thermodynamic exchange process between the medium and the environment causes the air phase change and condensation, and the ice crystal precipitates form a mechanical blockage on the surface of the valve plate guide rod, causing the moving pair to stagnate. This type of physical blocking effect not only prolongs the ventilation cycle and aggravates the heat loss of the system, but also causes the oil freezing point to decrease, causing wax precipitation, and forming deposits in the valve body flow channel, ultimately resulting in a reduction in the gas flow cross-sectional area and a reduction in gas exchange efficiency. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a fire-retardant vacuum pressure breathing valve to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a fire-retardant vacuum pressure breathing valve, comprising a housing, and further comprising: An exhaust valve plate is arranged in the housing, a buffer block is provided above the exhaust valve plate, a piston cavity is defined in the buffer block, and a damping cavity is provided outside the piston cavity; A piston portion connected to an exhaust valve plate is provided in the piston cavity, a one-way air intake mechanism is provided at the bottom of the piston cavity, and a one-way exhaust mechanism is provided on the side wall of the piston cavity, and the one-way exhaust mechanism is located below the piston portion; A damping hole array is provided on the outside of the damping cavity. A temperature control shielding mechanism is provided above the damping cavity for stepwise shielding of the damping holes, so that the movement speed of the piston part driving the exhaust valve plate is negatively correlated with the temperature.

[0006] Preferably, a fire blocking part is provided in the housing, which includes a connection channel communicating with the housing. A fire blocking component is provided at the opening of the connection channel, and a protective cover is provided outside the connection channel.

[0007] Preferably, the outside of the connection channel is fixedly connected to the protective cover through a plurality of connecting rods. The fire blocking component includes a plurality of fire blocking sheets, and a plurality of fire blocking holes are provided on the fire blocking sheets. The fire blocking holes on every two adjacent fire blocking sheets communicate with each other.

[0008] Preferably, an adjusting part is provided in the housing, which includes an air inlet valve seat and an air outlet valve seat. An air inlet valve plate that can move up and down and cooperate with the air inlet valve seat is provided in the housing, and the exhaust valve plate can cooperate with the exhaust valve seat.

[0009] Preferably, conveying holes are respectively provided on the air inlet valve seat and the air outlet valve seat, and a conveying pipe is provided on the inner wall of the housing. The two ends of the conveying pipe are respectively communicated with the corresponding conveying holes.

[0010] Preferably, a sliding cylinder is provided at the top of the housing, a sliding rod is slidably connected in the sliding cylinder, and the lower end of the sliding rod is fixedly connected to the air inlet valve plate.

[0011] Preferably, the piston part includes a piston plate, a piston rod and an elastic component. The piston plate is slidably connected in the piston cavity. The bottom of the piston plate is provided with a piston rod that penetrates through the buffer block and is fixedly connected to the exhaust valve plate, and an elastic component is provided on the piston rod.

[0012] Preferably, the one-way air inlet mechanism includes an air inlet hole and a single air inlet component provided in the air inlet hole, and the one-way air exhaust mechanism includes an air exhaust hole and a single air exhaust component provided in the air exhaust hole.

[0013] Preferably, the temperature control shielding mechanism includes a temperature sensing cavity, temperature sensing gas, a control plate and a reset component. A control groove is provided on the housing, the top of the control groove is communicated with the temperature sensing cavity, and the bottom of the control groove is communicated with the damping hole.

[0014] Preferably, a control plate is slidably connected in the control groove, and a reset component is provided on the top of the control plate.

[0015] The technical effects and advantages of the present invention: 1. Through the coordinated setting of relevant components, the present invention can match the intake / exhaust flow rate under working conditions such as temperature fluctuations, material phase changes, and environmental pressure changes, realizing the dynamic balance control of the pressure inside the tank, effectively suppressing the structural fatigue caused by overpressure and the risk of tank collapse caused by negative pressure. When an external flame invades with the gas, due to the sudden change in the flow channel cross-section, the flame front will be stretched and cooled. This stretching and cooling effect causes the flame temperature to rapidly drop below the ignition point of the combustible, thus interrupting the combustion chain reaction.

[0016] 2. At high temperatures, the action frequency of the exhaust valve plate of the present invention decreases step by step, effectively suppressing the mechanical wear of the contact interface between the valve plate and the valve seat, extending the service life of the key friction pair, and maintaining the action sensitivity of the breather valve. Under low-temperature operating conditions, the opening duration of the exhaust valve plate is shortened. This transient opening strategy effectively reduces the condensation rate of the humid and hot gas inside the tank in the valve cavity, greatly reducing the probability of ice crystals adhering to the slit channels of the flame arrester element, effectively suppressing the mechanical jamming and sealing surface failure caused by ice crystal accumulation. At the same time, the optimized opening and closing characteristics effectively control the ineffective heat loss of the breather valve, avoiding the risk of negative pressure in the storage tank caused by excessive ventilation while maintaining the pressure balance of the tank, ensuring the anti-collapse performance of the storage tank from both the thermodynamic and kinetic dimensions, and constructing an all-round safety barrier against leakage at high temperatures and ice blockage at low temperatures. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 It is a schematic diagram of the full-section front view structure of the present invention.

[0019] Figure 3 It is a schematic diagram of the structure of the control part in the present invention.

[0020] Figure 4 It is a schematic diagram of the structure of the buffer block and damping holes in the present invention.

[0021] The reference numerals are: 1, housing; 2, fire prevention part; 21, connecting channel; 22, fire prevention component; 221, fire prevention sheet; 222, fire prevention hole; 23, protective cover; 24, connecting rod; 3, adjusting part; 31, intake valve seat; 32, exhaust valve seat; 33, intake valve plate; 34, exhaust valve plate; 35, conveying hole; 36, conveying pipe; 37, sliding cylinder; 38, sliding rod; 39, piston plate; 310, piston rod; 311, elastic component; 4, control part; 41, buffer block; 42, damping regulation mechanism; 421, intake hole; 422, single intake component; 423, damping cavity; 424, exhaust hole; 425, single exhaust component; 426, temperature sensing cavity; 427, temperature sensing gas; 428, damping hole; 429, control groove; 4210, control plate; 4211, reset component; 43, piston cavity. Detailed implementation manners

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] Embodiment 1 During the operation of the storage oil tank in a gas station, the volume of its gas phase space will fluctuate dynamically due to oil product loading and unloading operations and environmental temperature changes. Under extreme weather conditions or high-intensity oil product turnover operations, the pressure in the tank will exhibit violent oscillation characteristics: when encountering a continuous high-temperature environment or a rapid oil receiving condition, the superposition of the increase in oil product vapor pressure and the thermal expansion effect will cause the pressure in the tank to rise sharply. If the pressure exceeds the design bearing limit of the storage tank, the wall material of the tank will undergo excessive elastic deformation, and local yield instability may occur under long-term action, resulting in bulging and deformation of the tank body or even tearing of the weld seam, significantly increasing the probability of fire and explosion accidents. On the contrary, in a low-temperature environment or a large-flow oil unloading operation, the shrinkage of the oil product will cause the volume of the gas phase space to increase, and the pressure in the tank will drop suddenly to form a negative pressure condition. When the absolute pressure is lower than the differential pressure safety threshold between the tank body structure strength and the atmospheric pressure, the tank wall will bear a net pressure pointing inward. In the case of the failure of the breather valve or delayed air replenishment, the tank body may be deformed by centripetal collapse, causing structural damage.

[0024] To solve the above technical problems, please refer to Figures 1 to 4As shown in the figure, the first embodiment of the present invention provides a fire - resistant vacuum pressure breathing valve, which includes a housing 1, and also includes a fire - resistant part 2 and an adjusting part 3. The fire - resistant part 2 includes a connection channel 21 communicating with the housing 1. A fire - resistant component 22 is provided at the opening of the connection channel 21, and a protective cover 23 is provided outside the connection channel 21. The adjusting part 3 includes an intake valve seat 31 and an exhaust valve seat 32. An intake valve plate 33 that can move up and down and cooperate with the intake valve seat 31 is provided inside the housing 1, and an exhaust valve plate 34 that can move up and down and cooperate with the exhaust valve seat 32 is provided inside the housing 1.

[0025] The outside of the connection channel 21 is fixedly connected to the protective cover 23 through a plurality of connecting rods 24. The fire - resistant component 22 includes a plurality of fire - resistant sheets 221, and a plurality of fire - resistant holes 222 are opened on the fire - resistant sheets 221. The fire - resistant holes 222 on every two adjacent fire - resistant sheets 221 communicate with each other.

[0026] Delivery holes 35 are respectively opened on the intake valve seat 31 and the exhaust valve seat 32. A delivery pipe 36 is provided on the inner wall of the housing 1, and both ends of the delivery pipe 36 communicate with the corresponding delivery holes 35 respectively.

[0027] A sliding cylinder 37 is provided at the top of the housing 1. A sliding rod 38 is slidably connected inside the sliding cylinder 37, and the lower end of the sliding rod 38 is fixedly connected to the intake valve plate 33.

[0028] A piston cavity 43 is opened in the buffer block 41. A piston part is provided inside the piston cavity 43. The piston part includes a piston plate 39, a piston rod 310 and an elastic component 311. Specifically, a piston plate 39 is slidably connected inside the piston cavity 43. A piston rod 310 that penetrates through the buffer block 41 and is fixedly connected to the exhaust valve plate 34 is provided at the bottom of the piston plate 39. An elastic component 311 is provided on the piston rod 310. The elastic component 311 is a spring sleeved on the piston rod 310, and the spring is located between the piston rod 310 and the exhaust valve plate 34.

[0029] During the use process, the housing 1 can be assembled with the top of the oil storage tank. When the pressure of the oil and gas in the oil storage tank is relatively high, the gas in the oil storage tank pushes the exhaust valve plate 34 to move upward. The exhaust valve plate 34 drives the piston rod 310 to move upward and compress the elastic component 311. The gas in the oil storage tank flows out from the gap between the exhaust valve plate 34 and the exhaust valve seat 32. The gas flowing out of the oil storage tank flows through the connection channel 21 to the fire - resistant component 22. The gas flows through the fire - resistant holes 222 on the fire - resistant plate to the protective cover 23, and finally the gas flows to the outside through the protective cover 23 for pressure relief operation, so that the pressure of the gas in the oil storage tank gradually decreases. When the pressure of the gas in the oil storage tank decreases to the set value, the pressure of the gas in the oil storage tank is not enough to support the exhaust valve plate 34. The exhaust valve plate 34 moves downward under the combined action of gravity and the elastic component 311. When the exhaust valve plate 34 moves downward to the limit position, the exhaust valve plate 34 completes the cooperation with the exhaust valve seat 32, and the sealing of the oil storage tank is completed.

[0030] When the pressure in the oil storage tank is low, the pressure of the external gas is greater than the pressure of the gas in the oil storage tank plus the gravity of the intake valve plate 33. At this time, the external gas enters the fire-blocking hole 222 of the fire-blocking plate through the protective cover 23. If the external gas is mixed with the fire source and enters the fire-blocking part 2 at this time, the fire source passes through the fire-blocking hole 222 of the fire-blocking plate under the drive of the gas, thereby realizing the energy loss of the flame and the interruption of the combustion chain reaction, isolating the external fire source from contacting the combustible gas in the tank, and the external gas pushes the intake valve plate 33 to move upward. The intake valve plate 33 drives the slide rod 38 to move upward relative to the slide cylinder 37, and the external gas enters the top of the shell 1 through the gap between the intake valve plate 33 and the intake valve seat 31, and the gas enters the delivery pipe 36 through the delivery hole 35 on the upper side. Then it enters the oil storage tank through the delivery hole 35 on the lower side to complete the replenishment of the pressure in the oil storage tank. When the pressure in the oil storage tank increases to within the set range, the external gas is not enough to push the intake valve plate 33. The intake valve plate 33 moves downward to the initial position under the action of gravity. The intake valve plate 33 and the intake valve seat 31 are matched, and the intake channel is closed. Through the coordinated arrangement of the intake valve plate 33, the exhaust valve plate 34, the delivery pipe 36, the elastic component 311, the slide rod 38 and the slide cylinder 37, when the pressure in the oil storage tank is affected by temperature fluctuations, material changes and environmental factors, dynamic pressure regulation, structural protection and loss control are used to adaptively adjust the intake and exhaust to ensure the safe storage of the oil storage tank and avoid cracking or deflation of the oil storage tank.

[0031] Embodiment 2 Under high-temperature operating conditions, the medium in the tank evaporates faster due to heat. The thermal expansion of the gas significantly increases the rate of pressure rise within the tank. This sudden pressure drop directly shortens the valve's operating cycle, forcing the valve disc to open and close frequently. Long-term reciprocating motion exacerbates mechanical wear on the actuator, manifesting as irreversible damage such as accumulated wear on the sealing surface and increased spring fatigue. This ultimately causes the valve's response threshold to drift and sensitivity to gradually decrease. During the breathing cycle under low-temperature operating conditions, forced convection heat transfer occurs between the cryogenic medium and the ambient environment. When the ambient humidity reaches the dew point, water vapor in the air condenses and crystallizes on the cold end surface of the valve body, forming an ice crystal deposit. This mechanically blocks the opening and closing stroke of the valve disc. The cryogenic medium also induces wax precipitation in the oil. Wax crystal deposits gradually accumulate on the inner wall of the valve cavity, forming a viscous obstruction layer that reduces the cross-sectional area for gas flow. This double obstruction effect not only reduces the valve's flow capacity but also causes abnormal negative pressure in the tank during rapid pressure relief. In extreme cases, it can cause the tank wall to become unstable and deform.

[0032] See also Figures 1 to 4 As shown, the control unit 4 includes a buffer block 41 arranged in the housing 1. The buffer block 41 is provided with a damping control mechanism 42. The damping control mechanism 42 can control the closing time of the exhaust valve plate 34 according to the change of temperature.

[0033] The unidirectional intake mechanism includes an intake hole 421 and a single intake component 422 arranged in the intake hole 421. Specifically, an intake hole 421 communicating with the piston chamber 43 is formed at the bottom of the housing 1, and a single intake component 422 is provided in the intake hole 421.

[0034] The unidirectional exhaust mechanism includes an exhaust hole 424 and a single exhaust component 425 arranged in the exhaust hole 424. Specifically, the damping regulation mechanism 42 includes a damping chamber 423 formed in the housing 1. The damping chamber 423 communicates with the piston chamber 43 through an exhaust hole 424 formed in the housing 1, and a single exhaust component 425 is provided in the exhaust hole 424.

[0035] The temperature control shielding mechanism includes a temperature sensing chamber 426, a temperature sensing gas 427, a control plate 4210 and a reset component 4211. Specifically, a temperature sensing chamber 426 is formed at the top of the housing 1, a temperature sensing gas 427 is provided in the temperature sensing chamber 426, and the volume of the temperature sensing gas 427 can change with the temperature. A plurality of damping holes 428 communicating with the damping chamber 423 are formed on the side wall of the housing 1. A control groove 429 is formed in the housing 1. The top of the control groove 429 communicates with the temperature sensing chamber 426, and the bottom of the control groove 429 communicates with the damping holes 428. A control plate 4210 capable of shielding the damping holes 428 is slidably connected in the control groove 429. A reset component 4211 is provided at the top of the control plate 4210. The reset component 4211 is a reset spring. The upper end of the reset spring is connected to the side wall of the control groove 429, and the lower end of the reset spring is connected to the control plate 4210.

[0036] Based on the above embodiments, when the external temperature is relatively high, as described above, the evaporation rate of the gas in the storage oil tank is relatively fast, the gas pressure above the storage oil tank increases, and the gas in the storage oil tank pushes the exhaust valve plate 34 upward to open. During the upward movement of the exhaust valve plate 34, the piston plate 39 is driven to move upward in the piston chamber 43 through the piston rod 310. Since the bottom of the housing 1 is provided with an air inlet hole 421 communicating with the piston chamber 43, and a single air inlet assembly 422 is provided in the air inlet hole 421, the damping control mechanism 42 includes a damping chamber 423 opened in the housing 1. The damping chamber 423 is communicated with the piston chamber 43 through an exhaust hole 424 opened in the housing 1, and a single exhaust assembly 425 is provided in the exhaust hole 424. When the piston plate 39 moves upward in the piston chamber 43, the gas in the housing 1 enters the piston chamber 43 through the air inlet hole 421. When the pressure in the storage oil tank reaches the set range, the gas in the storage oil tank is not sufficient to support the exhaust valve plate 34, and the exhaust valve plate 34 falls under the action of gravity and the reset assembly 4211. Because the temperature rises, the temperature in the temperature sensing chamber 426 rises, and the temperature sensing gas 427 in the temperature sensing chamber 426 expands due to the temperature rise. The temperature sensing gas 427 pushes the control plate 4210 in the control groove 429 to move downward and stretches the reset assembly 4211. During the downward movement of the control plate 4210, the number of damping holes 428 blocked increases, so that the number of damping holes 428 communicating with the damping chamber 423 decreases. The exhaust valve plate 34 drives the piston plate 39 to move downward in the piston chamber 43 through the piston rod 310, so that the gas in the piston chamber 43 enters the damping chamber 423 through the exhaust hole 424, and the gas is then discharged through the damping holes 428 in the damping chamber 423. Since the aperture of the damping hole 428 is relatively small, during the process of the piston plate 39 pushing the gas to discharge, the frictional resistance between the gas and the damping hole 428 serves as the resistance when the piston plate 39 moves downward. Since the number of damping holes 428 communicating with the damping chamber 423 is relatively small at this time, the gas flow rate increases, the frictional force increases, and the falling speed of the piston plate 39 slows down. The speed of the piston plate 39 driving the exhaust valve plate 34 to move downward through the piston rod 310 slows down. In the case of a relatively high temperature, the opening time of the exhaust valve plate 34 is extended, the exhaust time in the liquid storage tank increases, and the pressure difference in the storage oil tank compared with that before exhaust increases. When the exhaust valve plate 34 closes until the next opening, the time for the gas in the storage oil tank to reach the preset pressure value increases. In a high-temperature environment, the opening and closing times of the exhaust valve plate 34 are reduced, avoiding the wear of the exhaust valve plate 34 and the exhaust valve seat 32 due to frequent opening, extending the service life of the components, and ensuring the sensitivity of the breathing valve.

[0037] When the outside temperature is low and the oil storage tank needs to be exhausted, the exhaust valve plate 34 drives the piston plate 39 to move upward through the piston rod 310. During the upward movement of the piston plate 39, the gas in the shell 1 is drawn into the damping chamber 423. When the gas in the oil storage tank is not enough to support the exhaust valve plate 34, the exhaust valve plate 34 moves upward under the action of gravity and the elastic component 311. Due to the low temperature, the temperature in the temperature sensing chamber 426 is low, which reduces the volume of the gas in the temperature sensing chamber 426. The control plate 4210 moves upward under the pull of the reset component 4211. During the upward movement of the control plate 4210, the number of the damping holes 428 blocked by the control plate 4210 is reduced, so that the control plate 4210 is connected to the damping chamber 423. The number of damping holes 428 increases. When the gas in the damping chamber 423 is discharged through multiple damping holes 428, the friction resistance of the discharge is reduced, and the resistance of the piston rod 310 when falling is reduced. The time for the piston rod 310 to drive the exhaust valve plate 34 to move downward is reduced, so that the opening time of the exhaust valve plate 34 in a low temperature environment is reduced, which can effectively reduce the retention time of condensed water and prevent ice crystals from clogging the fire-blocking hole 222. The fast action can reduce the number of frictions between the exhaust valve plate 34 and the exhaust valve seat 32 at low temperatures. By reducing problems such as icing, jamming and sealing failure, the cycle of maintenance operations such as cleaning the fire-blocking layer and calibrating the spring can be extended. At the same time, excessive heat loss can be avoided, the sensitivity of the breathing valve can be guaranteed, and the oil storage tank can be prevented from being deflated.

[0038] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A fire-resistant vacuum pressure breather valve, comprising a housing, characterized in that, Further included are: An exhaust valve plate disposed inside the housing. A buffer block is provided above the exhaust valve plate. A piston chamber is formed inside the buffer block, and a damping chamber is provided outside the piston chamber; A piston portion connected to the exhaust valve plate is disposed inside the piston chamber. A one-way air intake mechanism is provided at the bottom of the piston chamber, and a one-way exhaust mechanism is provided on the side wall of the piston chamber. The one-way exhaust mechanism is located below the piston portion; Damping holes are formed in an array on the outside of the damping chamber. A temperature control shielding mechanism is provided above the damping chamber for stepwise shielding of the damping holes, so that the movement speed of the piston portion driving the exhaust valve plate is negatively correlated with the temperature.

2. The flame-retardant vacuum pressure breathing valve according to claim 1, wherein, A flame retardant portion is provided inside the housing, which includes a connection channel communicating with the housing. A flame retardant assembly is provided at the opening of the connection channel, and a protective cover is provided outside the connection channel.

3. The flame-retardant vacuum pressure breather valve according to claim 2, wherein The outside of the connection channel is fixedly connected to the protective cover through a plurality of connecting rods. The flame retardant assembly includes a plurality of flame retardant sheets, and a plurality of flame retardant holes are formed in the flame retardant sheets. The flame retardant holes on every two adjacent flame retardant sheets communicate with each other.

4. The flame arrester vacuum pressure breather valve according to claim 3, wherein An adjusting portion is provided inside the housing, which includes an intake valve seat and an exhaust valve seat. An intake valve plate that can move up and down and cooperate with the intake valve seat is provided inside the housing, and the exhaust valve plate can cooperate with the exhaust valve seat.

5. The flame-retardant vacuum pressure breathing valve according to claim 4, wherein Delivery holes are respectively formed in the intake valve seat and the exhaust valve seat. A delivery pipe is provided on the inner wall of the housing, and both ends of the delivery pipe communicate with the corresponding delivery holes respectively.

6. The flame-retardant vacuum pressure breathing valve according to claim 5, wherein, A sliding cylinder is provided at the top of the housing. A sliding rod is slidably connected inside the sliding cylinder, and the lower end of the sliding rod is fixedly connected to the intake valve plate.

7. The flame arrester vacuum pressure breathing valve according to claim 6, characterized in that, The piston portion includes a piston plate, a piston rod and an elastic component. The piston plate is slidably connected inside the piston chamber. A piston rod that penetrates through the buffer block and is fixedly connected to the exhaust valve plate is provided at the bottom of the piston plate, and an elastic component is provided on the piston rod.

8. The fire - resistant vacuum pressure breathing valve according to claim 7, characterized in that, The one-way air intake mechanism includes an air intake hole and a single air intake component disposed inside the air intake hole. The one-way exhaust mechanism includes an exhaust hole and a single exhaust component disposed inside the exhaust hole.

9. The fireproof vacuum pressure breather valve according to claim 8, wherein, The temperature control shielding mechanism includes a temperature sensing chamber, temperature sensing gas, a control plate and a reset component. A control groove is formed in the housing. The top of the control groove communicates with the temperature sensing chamber, and the bottom of the control groove communicates with the damping hole.

10. The fire-resistant vacuum pressure breathing valve according to claim 9, wherein, A control plate is slidably connected inside the control groove, and a reset component is provided at the top of the control plate.

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