CN219655350U - Breather valve sealing mechanism and storage tank burn-resistant breathing device - Google Patents

Abstract

The utility model provides a breather valve sealing mechanism, comprising: an annular seal groove formed in a working end face of the valve disc, the cross section of the annular seal groove being configured to increase in width inwardly from the working end face, and first cone tips being formed at both side wall ends of the annular seal groove; a containment seal ring mounted within the annular seal groove; and an annular projection formed on the working end surface of the valve seat, the cross section of which is configured to be tapered, thereby forming a second taper at the end of the annular projection; the valve disc can be seated on the valve seat, the second cone tip is wrapped by the containing sealing ring to form a first seal, and the first cone tip is tightly attached to the conical inclined surface of the annular bulge to form a second seal and a third seal on the inner side and the outer side of the first seal respectively. The utility model also provides a burning-resistant breathing device of the storage tank.

Description

Breather valve sealing mechanism and storage tank burn-resistant breathing device

Technical Field

The utility model belongs to the technical field of storage tank safety devices, and particularly relates to a breather valve sealing mechanism and a storage tank burn-resistant breathing device.

Background

The breather valve is used as one of the safety accessories of the storage tank and has the function of reducing the evaporation loss of volatile liquid in the normal-pressure and low-pressure storage tanks. The breather valve not only can maintain the air pressure balance in the tank and ensure that the storage tank is prevented from being damaged in case of overpressure and negative pressure, but also can reduce volatilization and loss of medium in the storage tank by utilizing the pressure bearing capacity of the storage tank, and has important roles on safety and environmental protection.

Under normal working conditions, the breather valve starts to inhale air into the tank when the storage tank outputs materials outwards, and starts to exhale the gas in the tank to the outside of the tank when the storage tank is filled with materials. The vapor pressure of the materials in the tank is increased or reduced due to climate change and the like, and the breather valve exhales vapor or inhales air or nitrogen. Under abnormal working conditions, when a fire disaster occurs, the evaporation amount of liquid in the tank is increased rapidly due to heating of the storage tank, and the breather valve begins to exhale outwards of the tank, so that the storage tank is prevented from being damaged due to overpressure. Under other working conditions, such as pressurized delivery of volatile liquid, chemical reaction of internal and external heat transfer devices, misoperation and the like, the breather valve performs exhalation or inhalation so as to avoid damage to the storage tank caused by overpressure or super vacuum. And meanwhile, the breather valve exhales outside the tank, and in case of lightning strike, the breather valve fires, and materials exhaled by the breather valve can be continuously combusted. In the traditional concept, the flame arrester or the flame arrester disk has a burning-resistant function, german PTB respectively carries out burning-resistant experiments on the pipeline detonation flame arrester according to the USCG standard and the vertical and horizontal installation positions (the tail end of the flame arrester directly faces the atmosphere), and the conventional flame arrester is found to have burning resistance of at most 30 minutes, however, according to the international standard, the burning-resistant time of the all-weather breather valve is not less than 2 hours. Therefore, the common respiratory valve is additionally provided with the common flame arrester, which cannot meet the international standard of 2 hours of burn resistance, and the product is blank in China and is not yet applied. Meanwhile, after the fire-resistant flame arrester is additionally arranged on the breather valve with a common structure, the structure of the breather valve is increased, so that the problem of the overall weight rise of the breather valve is solved, the top of the storage tank is limited in bearing weight due to the steel body structure, the top of the storage tank is easy to sink, and the safety risk is brought to the storage tank.

The breather valve disc should possess certain sealing ability with the disk seat to reduce breather valve leakage storage tank material, domestic standard SY0511 "petroleum storage tank annex part 1: the leakage test pressure is 75% of the opening pressure in the breather valve ", the leakage amount of the breather valve below DN150 is less than 0.04m3/h, and the leakage amount of the breather valve above DN200 is less than 0.4m3/h. International standard API2000 specifies that the respiratory valve leakage below DN150 is less than 0.0142m3/h and the respiratory valve leakage above DN200 is less than 0.1416m3/h. The leakage amount of the breather valve of the domestic common sealing structure cannot meet the standard requirement of the API2000, so how to realize the efficient sealing of the breather valve is a fundamental way for reducing the leakage amount of the breather valve.

At present, the domestic breather valve pays attention to the design of the valve disc opening pressure and ventilation volume to meet the standard, so that consideration on the leakage volume of the breather valve is deficient, and when 75% of the opening pressure is caused, the valve disc is leaked with a lot of storage tank media, and the leaked storage tank media are directly discharged into the atmosphere, so that air pollution is caused, and meanwhile, loss of the storage tank media is caused. According to SY0511 standard calculation, DN200 breather valve leakage amount 3504m 3/year at 75% opening pressure, while the same-size API standard breather valve leakage amount 1240m 3/year, the breather valve leakage amount is greatly reduced. According to the API2000 standard, domestic respiratory valves cannot meet international standard requirements. Because the domestic breather valve leakage is large at present, and safety risks and environmental protection problems exist, a high-efficiency sealing structure capable of reducing the breather valve leakage is needed.

Disclosure of Invention

Aiming at the technical problems, the utility model aims to provide the breather valve sealing mechanism and the storage tank burning-resistant breathing device, which can realize high-efficiency sealing of the breather valve in a storage tank pressure normal state, effectively prevent gas in the storage tank from leaking into the atmosphere, and improve the burning-resistant fire-retardant performance of the breather valve.

To this end, according to a first aspect of the present utility model, there is provided a breather valve seal mechanism comprising: an annular seal groove formed in a working end face of the valve disc, the cross section of the annular seal groove being configured to increase in width inwardly from the working end face, and first cone tips being formed at both side wall ends of the annular seal groove; a containment seal ring mounted within the annular seal groove; and an annular projection formed on the working end surface of the valve seat, the cross section of which is configured to be tapered, thereby forming a second taper at the end of the annular projection; the valve disc can be seated on the valve seat, the second cone tip is wrapped by the containing sealing ring to form a first seal, and the first cone tip is tightly attached to the conical inclined surface of the annular bulge to form a second seal and a third seal on the inner side and the outer side of the first seal respectively.

In one embodiment, the annular seal groove has a trapezoidal cross-sectional shape, and the internal angle of the trapezoid is set to 45-60 °.

In one embodiment, the included angle of the conical surface of the second conical tip is set to 90-100 °.

In one embodiment, the first cone tip and the second cone tip are both processed with an arc, and the diameter of the arc is 0.1-0.3 mm.

In one embodiment, the inner wall surface of the annular seal groove and the conical inclined surface of the annular protrusion are both subjected to grinding treatment, and the surface roughness of the annular seal groove is less than 2 microns.

In one embodiment, the containing seal ring is a non-newtonian fluid foaming seal ring capable of resisting the impact of the second cone tip and wrapping the second cone tip when the valve disc falls back into contact with the second cone tip.

According to a second aspect of the present utility model, there is provided a burn-resistant breathing apparatus for a storage tank, comprising: a main valve body; a pressure valve disposed within the main valve body, the pressure valve including a pressure valve seat fixed to an inner wall of the main valve body and a pressure valve disc adaptable to the pressure valve seat, the pressure valve being capable of opening when a pressure of gas within the tank exceeds a predetermined pressure of the pressure valve to reduce a pressure of the gas within the tank; the vacuum valve comprises a mounting cover arranged at the upper end of the air suction hole, a vacuum valve seat arranged in the air suction hole and a vacuum valve disc, the vacuum valve disc is connected with the mounting cover through a balance spring, the vacuum valve disc can be tightly attached to the vacuum valve seat under the action of the balance spring to close the vacuum valve, and the vacuum valve can be downwards moved to be opened when the gas in the storage tank is under negative pressure and is lower than the preset pressure of the vacuum valve so as to supplement the pressure in the gas in the storage tank; the breather valve sealing mechanisms are adopted between the pressure valve disc and the pressure valve seat and between the vacuum valve disc and the vacuum valve seat.

In one embodiment, a fire-resistant and fire-retarding component is arranged at the upper end opening of the main valve body and comprises a heat-insulating layer and a fire-resistant and fire-retarding disk, the fire-resistant and fire-retarding disk is arranged below the heat-insulating layer,

the upper end of the main valve body is provided with a concave table-shaped annular disc, and the fire-resistant and fire-retarding component is fixedly arranged in the table-shaped annular disc.

In one embodiment, the pressure valve seat comprises an annular supporting plate and a pressure valve seat body which is configured into a cylinder shape, the pressure valve seat body is installed in an inner hole of the annular supporting plate in an interference fit mode, a first annular bulge is configured at the upper end, a first annular sealing groove is configured at the lower end face of the pressure valve disc, a first containing sealing ring is installed in the first annular sealing groove,

the pressure valve disc is correspondingly arranged above the pressure valve seat body, can be seated on the pressure valve seat body, and forms a seal with the first annular sealing groove through the first annular bulge, so that the pressure valve is closed, and can be lifted to open the pressure valve.

In one embodiment, a lifting valve rod sleeve assembly is connected to the upper end of the pressure valve disc, the lifting valve rod sleeve assembly comprises a valve rod sleeve and a pressure valve rod which is installed in the valve rod sleeve in an adapting mode, the pressure valve rod is fixedly connected with the pressure valve disc, the valve rod sleeve is fixedly connected to the lower end face of the top of the main valve body, and the pressure valve disc can push the pressure valve rod to move in a lifting mode along the valve rod sleeve.

In one embodiment symmetrically distributed weight plates are provided on the pressure valve disc, the predetermined pressure of the pressure valve being adjusted by adjusting the weight of the weight plates.

In one embodiment, the vacuum valve seat is configured into a cylinder shape, the vacuum valve seat is installed in the air suction hole in an interference fit manner, the lower end of the vacuum valve seat is configured with a second annular bulge, the upper end surface of the vacuum valve disc is configured with a second annular sealing groove, a second containing sealing ring is installed in the second annular sealing groove,

the vacuum valve disc can be tightly attached to the vacuum valve seat under the action of the balance spring, and a seal is formed between the second annular bulge and the second annular seal groove, so that the vacuum valve is closed, and the vacuum valve can be opened by moving downwards under the action of air pressure.

In one embodiment, the mounting cover comprises a cylindrical body and a top plate arranged at the upper end of the cylindrical body, the upper end of the balance spring is fixedly connected with the top plate, the cylindrical body is provided with a plurality of ventilation holes,

the diameter of the cylindrical body is larger than that of the air suction hole, and the cylindrical body is fixed on the upper end face of the pressure valve disc and is communicated with the air suction hole.

In one embodiment, a spring stop collar is arranged in the cylindrical body, the spring stop collar is fixed on the lower end face of the top plate, and the balance spring is arranged in the spring stop collar.

Compared with the prior art, the utility model has the advantages that:

according to the breather valve sealing mechanism, the triple sealing member is formed between the valve disc and the valve seat, and the containing sealing ring with non-Newtonian characteristic is adopted, so that the breather valve can be effectively sealed when the pressure of the storage tank is normal, and gas in the storage tank can be effectively prevented from leaking into the atmosphere. According to the burn-resistant breather valve device for the storage tank, which is disclosed by the utility model, the pressure valve disc and the vacuum valve disc are integrated in the same structure, so that the ultra-compact burn-resistant breather valve is formed, the structure of the breather valve body is greatly simplified, the weight of the valve body is obviously reduced, the load on the top of the storage tank is very favorable to be reduced, and the risk of collapse of the top of the storage tank is avoided. The fire-resistant breather valve device for the storage tank utilizes the fire-resistant assembly formed by the fire-resistant plate and the high-temperature-resistant heat insulation layer, and can continuously resist fire for more than 2.5 hours under the condition that the breather valve fires, so that flame and high temperature can be effectively prevented from being transferred to the inside of the storage tank, explosion and fire are prevented, and the safety of a tank area is ensured. And, rain-proof cover that inflammable plastics that the storage tank was set up with resistant breather valve device can burn out in 3 minutes of burning to realize the quick diffusion of heat when the breather valve burns, the gaseous export of pressure valve sets up to perpendicularly upwards simultaneously, and the heat of flame can be taken away by surrounding air rapidly, is favorable to avoiding the heat accumulation very much, effectively reduces heat transfer to resistant fire-retardant dish and high temperature resistant insulating layer, has prevented the emergence of explosion conflagration, ensures the safety in tank field.

Drawings

The present utility model will be described below with reference to the accompanying drawings.

Fig. 1 schematically shows the structure of a breather valve seal mechanism according to the present utility model.

Fig. 2 schematically shows the structure of a burn-resistant breathing apparatus for a storage tank according to the present utility model.

Fig. 3 schematically shows the structure between the valve disc and the valve seat in the burn-resistant breathing apparatus of the tank shown in fig. 2.

Fig. 4 shows an exhalation state of the burn resistant breather valve device for a tank according to the present utility model.

Fig. 5 shows an inhalation state of the burn resistant breather valve device for a tank according to the present utility model.

Fig. 6 shows a cross-sectional view along line A-A of fig. 2.

Fig. 7 shows a structure of a mounting cap in the burn-resistant breather valve device for a tank shown in fig. 1.

Fig. 8 shows the structure of a test device for a burn-resistant breather valve device for a tank.

In the present utility model, all of the figures are schematic drawings which are intended to illustrate the principles of the utility model only and are not to scale.

Detailed Description

The utility model is described below with reference to the accompanying drawings.

In the present utility model, directional terms or qualifiers "upper end", "lower end" and the like used in the present utility model are used with reference to fig. 2. They are not intended to limit the absolute position of the parts involved, but may vary according to the specific circumstances.

Fig. 1 shows the structure of a burn-resistant breather valve device 100 for a tank of a breather valve seal mechanism 40 according to the present utility model. As shown in fig. 1, the breather valve sealing mechanism 40 includes an annular seal groove 401 formed in the working end surface of the valve disc 400, a containing seal ring 420 mounted in the annular seal groove 401, and an annular protrusion 301 formed in the working end surface of the valve seat 300. The cross section of the annular seal groove 401 is configured to increase in width inwardly from the working end face, and a first taper 402 is formed at both side wall ends of the annular seal groove (401). The cross section of the annular protrusion 301 is configured to be tapered such that a second taper 302 is formed at the end of the annular protrusion 301. The valve disc 400 can be seated against the valve seat 300 to form a first seal by wrapping the second cone tip 302 with the containment ring 420 and to form a second seal and a third seal on the inner and outer sides of the first seal by the close engagement of the first cone tip 402 with the tapered slope of the annular protrusion 301. Therefore, a triple sealing structure is formed between the valve disc and the valve seat, so that the valve disc and the valve seat are mutually meshed to form high-efficiency sealing, and no gas leakage is ensured when the valve disc and the valve seat are sealed and closed.

In one embodiment, the annular seal groove 401 has a trapezoidal cross-sectional shape with the interior angle of the trapezoid set at 45-60 °. Preferably, the cross-sectional shape of the annular seal groove 401 is an isosceles trapezoid, and the inner angle of the isosceles trapezoid is set to 60 °.

The included angle of the conical surface of the second cone tip 302 is set to 90-100. Preferably, the cone angle of the second cone tip 302 is set at 95 °.

The first cone tip 402 and the second cone tip 302 are both processed with an arc, and the diameter of the arc is set to be 0.1-0.3 mm.

The inner wall surface of the annular seal groove 401 and the conical inclined surface of the annular bulge 301 are subjected to grinding treatment, so that the surface roughness of the inner wall surface of the annular seal groove 401 and the conical inclined surface of the annular bulge 301 is less than 2 microns, and the sealing performance between the valve disc and the valve seat is greatly improved.

In accordance with the present utility model, the containing seal 420 employs a non-Newtonian fluid foaming seal having creep characteristics, the containing seal 420 being capable of resisting the impact of the second cone tip 302 at the moment the valve disc 400 falls back into contact with the second cone tip 302 of the valve seat 300 and being capable of wrapping the second cone tip 302 to form a seal.

For example, in one embodiment, the non-newtonian fluid foaming seal is prepared using dihydroxypolydimethylsiloxane, boric acid, polytetrafluoroethylene, white carbon black, and a simethicone solvent. When the valve disc 400 is seated after being opened, the non-newton fluid foaming sealing ring is in contact with the second conical tip 302 of the valve seat 300 instantly, the non-newton characteristics have impact resistance to avoid damage of sealing materials, and meanwhile, after the valve disc 400 is seated, the second conical tip 302 of the valve seat 300 is wrapped due to creep characteristics of the non-newton fluid foaming sealing ring, so that efficient sealing is formed. Therefore, the breather valve is sealed efficiently when the pressure of the storage tank is normal, and gas in the storage tank is prevented from leaking into the atmosphere.

The utility model also provides a storage tank burn-resistant breathing apparatus 100. Fig. 2 schematically shows the structure of the burn-resistant breather valve device 100 for a tank according to the present utility model. As shown in fig. 2, the fire-resistant breather valve device 100 for a storage tank includes a main valve body 2, a fire-resistant and fire-retardant assembly 30, a pressure valve formed inside the main valve body 2, a vacuum valve integrated on the pressure valve, and a rain cover 19 provided above the main valve body 2. The main valve body 2 is constructed in a cylindrical structure, and the upper and lower ends are provided with openings, and the fire-resistant and fire-retarding assembly 30 is installed at the upper end opening of the main valve body 2. The lower end of the main valve body 2 is configured as an inlet flange 1 for connection with a tank outlet (not shown). The pressure valve comprises a pressure valve seat 3 fixed on the inner wall of the main valve body and a pressure valve disc 4 capable of adapting to the pressure valve seat 3, and an upper cavity 41 and a lower cavity 42 are respectively formed on the upper side and the lower side of the pressure valve disc 4. The vacuum valve is integrated on the pressure valve disk 4, which comprises a vacuum valve seat 14 and a vacuum valve disk 15 which can be fitted to the vacuum valve seat 14. The breather valve sealing mechanism 40 described above is used between the pressure valve disc 4 and the pressure valve seat 3, and between the vacuum valve disc 15 and the vacuum valve seat 14.

In practical application, when the gas pressure in the storage tank exceeds the preset pressure of the pressure valve, the pressure valve disc 4 can be integrally lifted upwards under the action of the gas pressure to automatically open the pressure valve, and gas in the storage tank can enter the lower cavity 42 from the inlet flange 1, enter the upper cavity 41 through the pressure valve, further move upwards to pass through the upper cavity 41, and finally be discharged to the atmosphere through the fire-resistant and fire-retarding component 30, so that the expansion of the storage tank can be effectively prevented. And when the gas in the storage tank is negative pressure and is lower than the preset pressure of the vacuum valve, the fire-resistant breather valve device 100 for the storage tank can automatically open the vacuum valve under the action of the gas pressure, so that external air is sucked into the upper cavity 41 from the fire-resistant fire-retardant component 30, then enters the lower cavity 42 through the vacuum valve, and then enters the storage tank through the inlet flange 1, thereby supplementing the gas pressure of the storage tank, and effectively preventing the storage tank from being shrunken.

The burn-resistant breather valve device 100 for a storage tank is connected with an outlet of the storage tank through an inlet flange 1, when the pressure of the storage tank exceeds the expiration pressure, the burn-resistant breather valve device 100 for the storage tank can automatically exhale the gas in the storage tank through a pressure valve disc 4, and when the pressure of the storage tank is lower than the inspiration pressure, the burn-resistant breather valve device 100 for the storage tank can automatically inhale air into the storage tank through a vacuum valve disc 15 (see below). The diameter of the medium side flange 1 is related to the volume of the storage tank and the breathing gas amount in unit time, and can be set according to actual needs.

As shown in fig. 2, the main valve body 2 has a cylindrical shape. Preferably, the main valve body 2 is made of stainless steel, and the main valve body 2 is integrally cast. The top of the main valve body 2 is provided with an inward concave table-shaped annular disk 101, and the fire-resistant and fire-retarding component 30 is screwed on the table-shaped annular disk 101 arranged at the top of the main valve body 2.

According to the present utility model, firestop assembly 30 comprises insulation layer 17 and firestop tray 16, with firestop tray 16 mounted below insulation layer 17. Preferably, the fire resistant firestop plate 16 is made from a stainless steel corrugated plate reel, and the fine gaps between the corrugated plates are sprayed with a heat insulating coating to achieve that the corrugated firestop plate is able to withstand a fire for more than 2 hours. The heat insulating layer 17 is arranged above the fire-resistant plate 16 and is made of a cured polyimide and phthalonitrile blend material. When the heat insulation layer 17 is subjected to high temperature, a thermal insulation carbon layer is formed on the surface of phthalonitrile, and polyimide is raised by 60 ℃ in thermal degradation temperature, so that the thermal insulation carbon layer is decomposed at 1050 ℃, and the heat insulation layer 17 has excellent heat insulation performance. The heat insulating layer 17 can insulate heat from being transferred to the fire-resistant fire-retardant plate 16, and flame and high temperature are prevented from being transferred to the inside of the storage tank. When the fire-resistant breather valve device 100 for the storage tank is ignited, the fire-resistant assembly 30 formed by the fire-resistant plate 16 and the heat insulation layer 17 can last for over 2.5 hours, so that flame and high temperature are effectively prevented from being transferred to the inside of the storage tank, explosion and fire are prevented, and the safety of a tank area is ensured.

As shown in fig. 2, a rain cover 19 is mounted on the upper end surface of the main valve body 2 above the fire-resistant assembly 30. In one embodiment, a rain cover 19 is fixedly mounted to the outer wall of the main valve body 2 by upper top mounting bolts 18. The rain cover 19 is made of inflammable plastic, and the inflammable plastic is polymethyl methacrylate with a melting point of 150 ℃. The flammable plastic rain cover 19 is effective to prevent rain, insects and dust from entering the insulation layer 17 and the gaps of the fire resistant tray 16. When the fire resistant breather valve device 100 for the storage tank accidentally catches fire, the inflammable plastic rain cover 19 can be burnt out within 3 minutes of combustion, so that rapid diffusion of heat during combustion of the fire resistant breather valve is realized, and meanwhile, as the gas outlet of the fire resistant breather valve device 100 for the storage tank is arranged vertically upwards, the exhaust gas outlet of the pressure valve disc 4 is formed vertically upwards, so that heat of flame can be rapidly taken away by surrounding air, and heat accumulation is avoided very advantageously.

According to the utility model, the pressure valve seat 3 comprises an annular support plate 31 and a pressure valve seat body 32 which is configured in the shape of a cylinder. The annular support plate 31 is fixed to the inner wall of the main valve body 2. The pressure valve seat body 32 is mounted in an interference fit in the inner bore of the annular support plate 31. The pressure valve disk 4 is correspondingly disposed above the pressure valve seat body 32. The pressure valve disc 4 and the pressure valve seat body 32 are sealed in a matching way by adopting a breather valve sealing mechanism 40 a. As shown in fig. 3, the upper end of the pressure valve seat body 32 is configured with a first annular projection 301a, the lower end surface of the pressure valve disk 4 is configured with a first annular seal groove 401a, and a first containing seal ring 420a is installed in the first annular seal groove 401 a. The pressure valve disc 4 corresponds to be set up in the top of pressure valve seat body 32, and pressure valve disc 4 can sit on pressure valve seat body 32, and forms sealedly with first annular seal groove 401a through first annular protrusion 301a in order to close the pressure valve, has realized that the breather valve is sealed in the high efficiency when storage tank pressure normal state, avoids gas leakage in the storage tank to the atmosphere.

In one embodiment, the first annular seal groove 401a is disposed near the outer edge of the pressure valve disc 4, and the cross section of the first annular seal groove 401a is trapezoidal, and the inner angle of the trapezoid is 60 °, so that the first conical tip 402a is formed at the inner and outer sides of the first annular seal groove 401a, respectively. The first annular protrusion 301a is provided as a triangular cone tip having an angle of 95 ° so as to form a second cone tip 301a at the upper end of the pressure valve seat body 32. The first cone tip 402a and the second cone tip 301a are both processed by arc treatment, and the diameter of the arc is 0.1-0.3 mm. The trapezoid groove surface of the pressure valve disc 4 and the triangle inclined surface of the pressure valve seat 3 are subjected to grinding treatment, and the surface roughness of the trapezoid groove surface of the pressure valve disc 4 and the triangle inclined surface of the pressure valve seat body 32 is less than 2 microns. A first containing sealing ring 420a is installed in the first annular sealing groove 401a, and the first containing sealing ring 420a is made of sealing materials prepared by foaming non-Newtonian fluid. The pressure valve disc 4 is pressed on the pressure valve seat body 32, the triangular pointed cone of the pressure valve seat body 32 enters the trapezoidal groove of the pressure valve disc 4, the triangular pointed cone of the second cone point 301a is embedded into the first containing sealing ring 420a, and the first containing sealing ring 420a has creep characteristic to wrap the triangular pointed cone of the pressure valve seat body 32 to form a seal. While the first pointed cone 402a on the inner and outer sides of the trapezoid groove of the pressure valve disc 4 is tightly attached to the triangular inclined surface of the pressure valve seat body 32 to form a seal. Thus, together, a triple seal arrangement is formed whereby the pressure valve disc 4 and the pressure valve seat body 32 intermesh to form an efficient seal, ensuring that a seal is formed between the pressure valve disc 4 and the pressure valve seat body 32 so that no gas leaks when the tank pressure is below the take-off pressure of the pressure valve disc 4.

A lift valve rod sleeve assembly is connected to the upper end of the pressure valve disc 4. Preferably, two lifting valve rod sleeve assemblies are arranged, and the two lifting valve rod sleeve assemblies are radially symmetrically distributed. The lifting valve rod sleeve assembly comprises a valve rod sleeve 9 and a pressure valve rod 7 which is adaptively arranged in the valve rod sleeve 9, the pressure valve rod 7 is fixedly connected with the pressure valve disc 4, and the valve rod sleeve 9 is fixedly connected with the lower end face of a table-type annular disc 101 at the top of the main valve body 2. The upper end of the pressure valve rod 7 is inserted into the valve rod sleeve and can move up and down along the valve rod sleeve 9. In one embodiment, the pressure valve stem 15 is fixedly connected to the pressure valve disk 14 by threads. The diameter of the pressure valve rod 7 rod body is smaller than the inner diameter of the valve rod sleeve 9 by 1mm. The valve stem cover 9 is mounted on the lower end surface of the mesa-type annular disk 101 by screw connection. In one embodiment, the valve stem cover 9 is a cylindrical structure, and the valve stem cover 9 is made of stainless steel.

According to the utility model, symmetrically distributed weight plates 5 are provided on the pressure valve disk 4, and the predetermined pressure of the pressure valve (i.e. the tripping pressure of the pressure valve disk 4) can be adjusted by placing different weights on the weight plates 5.

In one embodiment, threaded holes for mounting corresponding pressure valve stems 7 are provided in each case in the upper end face of the pressure valve disk 4, the threaded holes being distributed symmetrically in the radial direction. The counterweight tray 5 is provided with a through mounting hole. The pressure valve rod 7 passes through the mounting hole of the counterweight disc 5 and is mounted in the threaded hole of the pressure valve disc 4, and the counterweight disc 5 is fixedly mounted on the upper end surface of the pressure valve disc 4 in a threaded screwing mode. In the embodiment shown in fig. 1-4, 2 lift valve stem sleeve assemblies and 2 counterweight trays 5 are provided. In practical use, the take-off pressure of the pressure valve disk 4 is adjusted by adjusting the weight of the counterweight tray 5.

When the pressure in the tank is normal, the pressure valve disc 4 presses against the pressure valve seat body 32 by its own weight and forms a seal by the breather valve seal mechanism 40a to close the pressure valve. Therefore, the lower end face of the pressure valve disc 4 and the upper end face of the pressure valve seat body 32 can be tightly contacted to form high-efficiency seal, and no gas leakage is ensured when the pressure of the storage tank is lower than the tripping pressure of the pressure valve disc 4 between the pressure valve disc 4 and the sealing face of the pressure valve seat body 32.

When the gas in the storage tank is positive pressure and higher than the jump pressure of the pressure valve disc 4, as shown in fig. 4, the pressure valve disc 4 is lifted upwards under the action of the gas pressure, the pressure valve rod 7 is lifted upwards as well, and the pressure valve disc 4 cannot be lifted continuously up to a certain height because the top end of the pressure valve rod 7 cannot pass through the sleeve 9, and the maximum height of the lifting of the pressure valve disc 4 is called the maximum jump height of the pressure valve disc 4. At this time, the lower end surface of the pressure valve disc 4 is separated from the upper end surface of the pressure valve seat body 32, a gap is formed therebetween, and the pressure valve is in an open state. The gas in the storage tank enters the lower cavity 42, passes through the gap between the pressure valve disc 4 and the pressure valve seat body 32 and enters the upper cavity 41, and is discharged to the atmosphere through the fire-resistant and fire-retardant assembly 30, so that the expansion of the storage tank can be effectively prevented.

When the pressure in the storage tank is lower than the backseat pressure of the pressure valve disc 4, the pressure valve disc 4 falls back onto the pressure valve seat body 32 from the maximum jump height, and the bottom surface of the pressure valve disc 4 and the top surface of the pressure valve seat body 32 form high-efficiency sealing again.

According to the utility model, a suction hole 43 is provided in the middle of the pressure valve disc 4, and a vacuum valve is integrally installed at the position of the suction hole 43. The suction openings 43 are preferably arranged in a circular shape, so that the pressure valve disk 4 forms an annular disk-like structure. As shown in fig. 1, the vacuum valve includes a mounting cap 11 provided at an upper end of a suction hole 43, a vacuum valve seat 14 which is interference-fitted in the suction hole 43 and is configured in a cylindrical shape, and a vacuum valve disc 15, the vacuum valve disc 15 being connected to the mounting cap 11 by a balance spring 13. The vacuum valve disk 15 can be closed against the vacuum valve seat 14 by the counter spring 13 and can be moved downwards by the air pressure to open the vacuum valve. The vacuum valve disc 15 and the vacuum valve seat 14 are sealed in a matching way by adopting a breather valve sealing mechanism 40 b. As shown in fig. 3, the lower end of the vacuum valve seat 14 is configured with a second annular protrusion 301b, the upper end surface of the vacuum valve disk 15 is configured with a second annular seal groove 401b, and a second containing seal ring 420b is installed in the second annular seal groove 401 b. The vacuum valve disc 15 is correspondingly arranged below the vacuum valve seat 14, and the vacuum valve disc 15 can be seated against the vacuum valve seat 14 under the action of the balance spring 13 and forms a seal with the second annular seal groove 401b by the second annular projection 301b to close the vacuum valve.

In one embodiment, the vacuum valve disk 15 is pressed against the vacuum valve seat 14 by means of the spring force of the balancing spring 13. The second annular seal groove 401b is disposed at a position close to the outer edge of the vacuum valve disc 15, the section of the second annular seal groove 401b is trapezoid, and the inner angle of the trapezoid is 60 degrees, so that first conical points 402b are formed on the inner side and the outer side of the second annular seal groove 401b respectively. The second annular protrusion 301b is provided as a triangular cone tip having an angle of 95 ° so as to form a second cone tip 301b at the lower end of the vacuum valve seat 14. The first cone tip 402b and the second cone tip 301b are both processed by an arc, and the diameter of the arc is 0.1-0.3 mm. The trapezoid groove surface of the vacuum valve disc 15 and the triangle inclined surface of the vacuum valve seat 14 are subjected to grinding treatment, and the surface roughness of the trapezoid groove surface of the vacuum valve disc 15 and the triangle inclined surface of the vacuum valve seat 14 is less than 2 microns. A second containing sealing ring 420b is installed in the second annular sealing groove 401b, and the second containing sealing ring 420b is made of sealing materials prepared by foaming non-Newtonian fluid. The vacuum valve disc 15 is pressed on the vacuum valve seat 14, the triangular pointed cone of the vacuum valve seat 14 enters the trapezoidal groove of the vacuum valve disc 15, the triangular pointed cone of the second cone tip 301b is embedded into the second containing sealing ring 420b, and the second containing sealing ring 420b has creep characteristic to wrap the triangular pointed cone of the vacuum valve seat 14 to form a seal. While the first pointed cone 402b on the inner side and the outer side of the trapezoid groove of the vacuum valve disc 15 are tightly attached to the triangular inclined surfaces of the vacuum valve seat 14 to form a seal. Thus, together, a triple seal is formed, the vacuum valve disc 15 and the vacuum valve seat 14 intermesh to form an efficient seal, ensuring that a seal is formed between the vacuum valve disc 15 and the vacuum valve seat 14 to ensure that no gas leaks when the tank pressure is above the take-off pressure of the vacuum valve disc 15.

As shown in fig. 5, the mounting cover 11 includes a cylindrical body 111 and a top plate 112 disposed at an upper end of the cylindrical body 111, the upper end of the balance spring 13 is fixedly connected to the top plate 112, and the cylindrical body 111 is provided with a plurality of ventilation holes 113 penetrating through a sidewall of the cylindrical body. In order to ensure the ventilation effect of the mounting cover 11, ventilation holes 113 are distributed on the cylindrical body 11 and are used for providing channels for the suction of the vacuum valve. The diameter of the cylindrical body 11 is larger than the diameter of the suction hole 43, and the cylindrical body 111 is fixed to the upper end surface of the pressure valve disk 4 and communicates with the suction hole 43. In a preferred embodiment, the diameter of the mounting cap 11 is set to be 20mm larger than the diameter of the suction hole 43 in the middle of the pressure valve disc 4, and the lower end of the mounting cap 11 is mounted to the upper end of the middle of the pressure valve disc 4 by brazing. The mounting cover 11 is preferably made of stainless steel.

A spring stopper 12 having a cylindrical shape is provided in the cylindrical body 111, the spring stopper 12 is fixed to the lower end surface of the top plate 112, and a balance spring 13 is provided in the spring stopper 12. In a preferred embodiment, the spring stop collar 12 is mounted on the inner central position of the mounting cover 11 by brazing, the top end of the balance spring 13 is vertically mounted on the inner central position of the mounting cover 11 by brazing, and the diameter of the spring stop collar 12 is larger than the diameter of the balance spring 13 by 2mm. The lower end of the balance spring 13 is fixedly connected with the vacuum valve disc 15 into a whole through threads. In actual use, the predetermined pressure of the vacuum valve (i.e., the take-off pressure of the vacuum valve disc 15) can be adjusted by changing the spring force of the balance spring 13.

When the pressure in the tank is normal, the vacuum valve disc 15 presses against the vacuum valve seat 14 by the spring force of the balance spring 13 and forms a seal by the breather valve seal mechanism 40b to close the pressure valve. Therefore, the upper end face of the vacuum valve disc 15 and the lower end face of the vacuum valve seat 14 are tightly contacted to form high-efficiency seal, and no gas leakage is ensured when the pressure of the storage tank is higher than the tripping pressure of the vacuum valve disc 15 between the vacuum valve disc 15 and the sealing face of the vacuum valve seat 14.

When the gas in the tank is at a negative pressure and below the trip pressure of the vacuum valve disc 15, the vacuum valve disc 15 is able to move downwards and lengthen the balancing spring 13 under the action of the gas pressure, as shown in fig. 5. The distance that the vacuum valve disc 15 moves downward is limited under the influence of the balancing spring 13, and the maximum distance that the vacuum valve disc 15 moves downward is called the maximum take-off height of the vacuum valve disc 15. At this time, the upper end surface of the vacuum valve disk 15 is separated from the lower end surface of the vacuum valve seat 14, and a space is formed therebetween, so that the suction hole 43 is opened to place the vacuum valve in an open state. Air outside the fire-resistant breather valve device 100 for the storage tank is sucked into the upper cavity 41 from the fire-resistant assembly 30, sequentially passes through the air holes 113 on the mounting cover 11, the air suction holes 43, the gap between the upper end surface of the vacuum valve disc 15 and the lower end surface of the vacuum valve seat 14, and then enters the lower cavity 42, and further enters the storage tank through the inlet flange 1, so that the air pressure in the storage tank is supplemented, and the air collapse of the storage tank is prevented.

When the pressure in the storage tank is higher than the back seat pressure of the vacuum valve disc 15, the vacuum valve disc 15 falls back to the vacuum valve seat 14 from the maximum jump height under the action of the balance spring 13, so that the upper end surface of the vacuum valve disc 15 and the lower end surface of the vacuum valve seat 14 are sealed again with high efficiency.

The fire resistant breather valve device 100 for a storage tank according to the present utility model can be applied particularly to an explosion zero zone, where the explosion zero zone refers to an environment where explosive gas or dust continuously occurs or occurs for a long period of time, for example, an area above the liquid surface of a storage tank, a gas pipe in the tank zone, a dock-and-ship-land butt joint pipe, and the like belong to the explosion zero zone.

According to the breather valve sealing mechanism 40, a triple sealing member is formed between the valve disc and the valve seat, and meanwhile, a containing sealing ring with non-Newtonian characteristics is adopted, so that the breather valve can be effectively sealed when the pressure of the storage tank is normal, and gas in the storage tank is effectively prevented from leaking into the atmosphere. The fire-resistant breather valve device 100 for the storage tank is arranged at the top of the storage tank, and the pressure valve disc 4 and the vacuum valve disc 15 are integrated in the same structure, so that an ultra-compact fire-resistant breather valve is formed, the structure of a breather valve body is greatly simplified, the weight of the valve body is obviously lightened, the load on the top of the storage tank is very beneficial to being lightened, and the risk of collapse of the top of the storage tank is avoided. The fire-resistant breather valve device 100 for the storage tank can continuously resist fire for more than 2.5 hours under the condition of firing of the breather valve by utilizing the fire-resistant assembly 30 formed by the fire-resistant plate 16 and the high-temperature-resistant heat insulation layer 17, so that flame and high temperature can be effectively prevented from being transferred into the storage tank, explosion and fire are prevented, and the safety of a tank area is ensured. And, the rain cover 19 that the inflammable plastics that the storage tank was with resistant breather valve device 100 set up can burn out in 3 minutes of burning to realize the quick diffusion of heat when the breather valve burns, the gaseous export of pressure valve sets up perpendicularly upwards simultaneously, and the heat of flame can be taken away by surrounding air rapidly, is favorable to avoiding heat accumulation very much, effectively reduces heat transfer to resistant fire-retardant disk 16 and high temperature resistant insulating layer 17, has prevented the emergence of explosion conflagration, ensures the safety in tank field.

The burn-resistant breather valve device 100 for a tank will be described below by taking a specific tank as an example.

Example 1:

taking an ultra-compact burn-resistant breather valve applied to a 3000-cube naphtha storage tank as an example, the diameter of an inlet flange 1 of the breather valve is DN150, the diameter of a main valve body 2 of the breather valve is 310mm, the overall height of the ultra-compact burn-resistant breather valve is 350mm, and the overall weight is 53kg, so that compared with 80kg of the weight of the breather valve with the same specification in the domestic market, the overall weight of the ultra-compact burn-resistant breather valve is greatly reduced. The diameter of the pressure valve seat 3 is 210mm and the diameter of the pressure valve disc 4 is 250mm. The weights of the two weight plates 5 were adjusted so that the take-off pressure of the pressure valve disk 4 was 1000Pa. The lengths of the two pressure valve stems 7 and the depths of the inner bores of the respective valve stem sleeves 9 were adjusted so that the maximum take-off height of the pressure valve disc 4 was set to 50mm. The pressure valve disk 4 is capable of reaching a maximum take-off height of a pressure of 1090Pa, i.e. an overpressure of 9%. The recoil pressure of the pressure valve disc 4 was 850Pa. The diameter of the suction hole 43 in the middle of the pressure valve disc 4 is 105mm, the diameter of the vacuum valve seat 14 is 100mm, the diameter of the spring mounting cover 11 is 125mm, the diameter of the vacuum valve disc 15 is 136mm, and the rigidity and the working force of the balance spring 13 are regulated so that the tripping pressure of the vacuum valve disc 15 is 300Pa below zero and the stretching working stroke of the balance spring 13 is 50mm below zero at 330 Pa. The breather valve sealing mechanism 40 is adopted between the pressure valve disc 4 and the pressure valve seat 3 and between the vacuum valve disc 15 and the vacuum valve seat 14, so that the ultra-compact burn-resistant breather valve can be effectively ensured to have no gas leakage in a normal state.

When the pressure of the gas in the naphtha storage tank exceeds the jump pressure 1000Pa of the pressure valve disc 4 in the burn-resistant breather valve, the pressure valve disc 4 rises upwards, the pressure valve disc 4 fully jumps, the gas in the naphtha storage tank enters the lower cavity 42 from the breather valve inlet flange 1 and moves upwards through the pressure valve disc 4 to enter the upper cavity 41, and is discharged to the atmosphere through the burn-resistant fire-retardant disk 16 and the heat insulation layer 17. Until the gas pressure in the naphtha storage tank is lower than the back seat pressure 850Pa of the pressure valve disc 4, the pressure valve disc 4 is quickly seated, and the lower end surface of the pressure valve disc 4 and the upper end surface of the pressure valve seat 3 are reformed into an efficient seal.

When the gas in the naphtha storage tank is negative pressure and is lower than the tripping pressure of the vacuum valve disc 15 by 300Pa, the vacuum valve disc 15 is sunk downwards and stretches the balance spring 13, the gas pressure in the naphtha storage tank is lower than 330Pa, the vacuum valve disc 15 is completely opened, air outside the ultra-compact burning-resistant breather valve is sucked into the upper cavity 41 from the heat insulation layer 17 and the burning-resistant fire-retardant disc 16, then enters the lower cavity 42 through the breather hole of the mounting cover 11 and the vacuum valve disc 15, and finally the air enters the storage tank from the breather valve inlet flange 1 to supplement the gas pressure of the storage tank. Until the gas pressure in the naphtha storage tank is higher than the back seat pressure-270 Pa of the vacuum valve disc 15, the vacuum valve disc 9 is quickly lifted under the action of the balance spring 13, and the upper end surface of the vacuum valve disc 15 and the lower end surface of the vacuum valve seat 14 are reformed into efficient sealing.

The utility model also provides a burn-in resistant breather valve testing device 200 for testing the performance of the burn-in resistant breather valve device 100 for a storage tank. As shown in fig. 6, the burn-in resistant breather valve testing device 200 is connected to the inlet flange 1 of the tank burn-in resistant breather valve device 100. The naphtha volatile gas and the air mixed gas are introduced into the combustion gas inlet 201 through the burning-resistant breather valve testing device, the shutoff valve 203 is opened, the flow is controlled through the detection of the flowmeter 202, the top end of the burning-resistant breather valve device 100 for the ultra-compact storage tank is ignited, the inflammable plastic rain cover 19 burns to the end after 230 seconds of ignition and combustion, the naphtha volatile gas at the top end of the burning-resistant breather valve device 100 for the storage tank is continuously combusted, the flame sensor 206 at the lower end of the burning-resistant breather valve device 100 for the storage tank does not detect flame all the time in the 2-hour process of the combustion of the naphtha volatile gas, and the ultra-compact burning-resistant breather valve of the naphtha storage tank can meet the requirement of burning resistance for 2 hours. Wherein 204 is a combustion gas buffer tank, 207 is a rupture disk, and 205 is a pressure gauge.

Example 2:

taking an ultra-compact burn-resistant breather valve applied to a 5000-cube gasoline storage tank as an example, the diameter of an inlet flange 1 of the breather valve is DN200, the diameter of a main valve body 2 of the breather valve is 380mm, the overall height of the ultra-compact burn-resistant breather valve is 390mm, and the overall weight is 85kg, so that compared with 120kg of the weight of the breather valve with the same specification in the domestic market, the overall weight of the ultra-compact burn-resistant breather valve is greatly reduced. The diameter of the pressure valve seat 3 is 280mm, and the diameter of the pressure valve disc 4 is 340mm. The weights of the two weight plates 5 were adjusted so that the take-off pressure of the pressure valve disk 4 became 1350Pa. The lengths of the two pressure valve stems 7 and the depth of the inner holes of the valve stem sleeves 9 were adjusted so that the maximum take-off height of the pressure valve disc 4 was set to 55mm. The pressure valve disc 4 is capable of achieving a maximum take-off height of 1472Pa, i.e. an overpressure of 9%. The recoil pressure of the pressure valve disc 4 is 1150Pa. The diameter of the suction hole 43 in the middle of the pressure valve disc 4 is 155mm, the diameter of the vacuum valve seat 14 is 150mm, the diameter of the mounting cover 11 is 175mm, the diameter of the vacuum valve disc 14 is 186mm, the rigidity and the working force of the balance spring 13 are regulated, the tripping pressure of the vacuum valve disc 15 is 300Pa, and the stretching working stroke of the balance spring 13 is 50mm when 330 Pa. The breather valve sealing mechanism 40 is adopted between the pressure valve disc 4 and the pressure valve seat 3 and between the vacuum valve disc 15 and the vacuum valve seat 14, so that the ultra-compact burn-resistant breather valve can be effectively ensured to have no gas leakage in a normal state.

When the pressure of the gas in the gasoline storage tank exceeds the jump pressure 1350Pa of the pressure valve disc 4 of the burn-resistant breather valve, the pressure valve disc 4 rises upwards, the pressure valve disc 4 fully jumps, the gas in the gasoline storage tank enters the lower cavity 42 from the breather valve inlet flange 1 and moves upwards through the pressure valve disc 4 to enter the upper cavity 41, and is discharged to the atmosphere through the burn-resistant fire-retardant disc 16 and the heat insulation layer 17. Until the gas pressure in the naphtha storage tank is lower than the recoil pressure 1150Pa of the pressure valve disc 4, the pressure valve disc 4 is quickly seated, and the lower end surface of the pressure valve disc 4 and the upper end surface of the pressure valve seat 3 are reformed into an efficient seal.

When the gas in the gasoline storage tank is negative pressure and is lower than the tripping pressure of the vacuum valve disc 15 by-300 Pa, the vacuum valve disc 15 is sunk downwards, the gas pressure in the gasoline storage tank is lower than-330 Pa, the vacuum valve disc 15 is completely opened, air outside the ultra-compact burning-resistant breather valve is sucked into the upper cavity 41 from the heat insulation layer 17 and the burning-resistant fire-retardant disc 16, then enters the lower cavity 42 through the breather hole of the mounting cover 11 and the vacuum valve disc 15, and finally the air enters the storage tank from the breather valve inlet flange 1 to supplement the gas pressure of the storage tank. Until the gas pressure in the naphtha storage tank is higher than the back seat pressure-270 Pa of the vacuum valve disc 15, the naphtha storage tank is quickly lifted under the action of the balance spring 13, and the upper end face of the vacuum valve disc 15 and the lower end face of the vacuum valve seat 14 are reformed into efficient sealing.

As shown in fig. 6, the mixed gas of the gasoline volatile gas and the air is introduced into the combustion gas inlet 201 through the fire-resistant breather valve testing device 200, the shutoff valve 203 is opened, the flow is controlled through the detection of the flowmeter 202, the top end of the fire-resistant breather valve device 100 for the ultra-compact storage tank is ignited, the inflammable plastic rain cover 19 burns to be completely burned after 230 seconds of ignition combustion, the gasoline volatile gas at the top end of the fire-resistant breather valve device 100 for the storage tank is continuously burned, and in the 2-hour process of burning the gasoline volatile gas, the flame sensor 206 at the lower end of the fire-resistant breather valve device 100 for the storage tank always does not detect flame, so that the ultra-compact fire-resistant breather valve of the gasoline storage tank can meet the requirement of fire resistance and burning for 2 hours.

Example 3:

taking an ultra-compact fire-resistant breather valve applied to a 10000 cubic benzene storage tank as an example, the diameter of an inlet flange 1 of the breather valve is DN300, the diameter of a main valve body 2 of the breather valve is 550mm, the overall height of the ultra-compact fire-resistant breather valve is 580mm, and the overall weight is 180kg, so that compared with the weight of the breather valve with the same specification in the domestic market, the overall weight of the ultra-compact fire-resistant breather valve is greatly reduced. The diameter of the pressure valve seat 3 is 380mm and the diameter of the pressure valve disc 4 is 440mm. The weights of the two weight plates 5 were adjusted so that the take-off pressure of the pressure valve disk 4 became 750Pa. The lengths of the two pressure valve stems 7 and the depths of the inner bores of the respective valve stem sleeves 9 were adjusted so that the maximum take-off height of the pressure valve disc 4 was set to 60mm. The pressure valve disc 4 is capable of reaching a maximum take-off height of 825Pa, i.e. an overpressure of 9%. The recoil pressure of the pressure valve disc 4 was 640Pa. The diameter of the suction hole 43 in the middle of the pressure valve disc 4 is 255mm, the diameter of the vacuum valve seat 14 is 250mm, the diameter of the spring mounting cover 11 is 275mm, the diameter of the vacuum valve disc 14 is 290mm, the rigidity and the working force of the balance spring 13 are regulated, the tripping pressure of the vacuum valve disc 15 is 300Pa, and the stretching working stroke of the balance spring 13 is 50mm when 330 Pa. The breather valve sealing mechanism 40 is adopted between the pressure valve disc 4 and the pressure valve seat 3 and between the vacuum valve disc 15 and the vacuum valve seat 14, so that the ultra-compact burn-resistant breather valve can be effectively ensured to have no gas leakage in a normal state.

When the pressure of the gas in the benzene storage tank exceeds the tripping pressure 750Pa of the pressure valve disc 4 of the burn-resistant breather valve, the pressure valve disc 4 rises upwards, the pressure valve disc 4 fully trips, the gas in the benzene storage tank enters the lower cavity 42 from the breather valve inlet flange 1 and moves upwards through the pressure valve disc 4 to enter the upper cavity 41, and is discharged to the atmosphere through the burn-resistant fire-retardant disc 16 and the heat insulation layer 17. Until the gas pressure in the benzene storage tank is lower than the back seat pressure 640Pa of the pressure valve disc 4, the pressure valve disc 4 is quickly seated, and the lower end surface of the pressure valve disc 4 and the upper end surface of the pressure valve seat 3 are reformed into an efficient seal.

When the gas in the benzene storage tank is negative pressure and is lower than the tripping pressure of the vacuum valve disc 15 by 300Pa, the vacuum valve disc 15 is sunk downwards and stretches the balance spring 13, the gas pressure in the benzene storage tank is lower than 330Pa, the vacuum valve disc 15 is completely opened, air outside the ultra-compact burning-resistant breather valve is sucked into the upper cavity 41 from the heat insulation layer 17 and the burning-resistant fire-retardant disc 16, then enters the lower cavity 42 through the breather hole of the mounting cover 11 and the vacuum valve disc 15, and finally the air enters the storage tank from the breather valve inlet flange 1 to supplement the gas pressure of the storage tank. When the gas pressure in the benzene storage tank is higher than the back seat pressure-270 Pa of the vacuum valve disc 15, the vacuum valve disc 9 is quickly lifted, and the upper end face of the vacuum valve disc 15 and the lower end face of the vacuum valve seat 14 are sealed again with high efficiency.

As shown in fig. 6, the mixture of the benzene volatile gas and the air is introduced into the combustion gas inlet 201 through the fire-resistant breather valve testing device 200, the shutoff valve 203 is opened, the flow is controlled by the detection of the flowmeter 202, the top end of the fire-resistant breather valve device 100 for the ultra-compact storage tank is ignited, the inflammable plastic rain cover 19 burns to be depleted after 230 seconds of ignition and combustion, the benzene volatile gas at the top end of the fire-resistant breather valve device 100 for the storage tank is continuously combusted, and the flame sensor 206 at the lower end of the fire-resistant breather valve device 100 for the storage tank does not detect flame all the time in the 2-hour process of the combustion of the benzene volatile gas, so that the ultra-compact fire-resistant breather valve of the benzene storage tank can meet the requirement of fire-resistant combustion for 2 hours.

In the description of the present utility model, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, in the description herein, reference to the terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Finally, it should be noted that the above description is only of a preferred embodiment of the utility model and is not to be construed as limiting the utility model in any way. Although the utility model has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the techniques described in the foregoing examples, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (14)

1. A breather valve seal mechanism, comprising:

an annular seal groove (401) formed on the working end surface of the valve disc (400), the cross section of which is configured to be gradually increased in width from the working end surface inwards, and first conical points (402) are formed at the two side wall ends of the annular seal groove (401);

a containment seal ring (420) mounted within the annular seal groove (401); and

an annular protrusion (301) formed on a working end surface of the valve seat (300), the cross section of which is configured to be tapered, so that a second taper point (302) is formed at an end portion of the annular protrusion (301);

the valve disc (400) can be seated on the valve seat (300), a first seal is formed by wrapping the second conical tip (302) by the containing sealing ring (420), and a second seal and a third seal are respectively formed on the inner side and the outer side of the first seal by tightly attaching the first conical tip (402) to the conical inclined surface of the annular bulge (301).

2. The breather valve seal mechanism of claim 1, wherein the annular seal groove (401) has a trapezoidal cross-sectional shape, and an inner angle of the trapezoid is set to 45-60 °.

3. The breather valve seal mechanism of claim 1 or 2, wherein the taper angle of the second cone tip (302) is set to 90-100 °.

4. A breather valve seal mechanism according to claim 3, wherein the first cone tip (402) and the second cone tip (302) are each circular-arc-shaped, and the diameter of the circular arc is 0.1-0.3 mm.

5. The breather valve seal mechanism of claim 4, wherein the inner wall surface of said annular seal groove (401) and the tapered slope of said annular protrusion (301) are both subjected to a grinding treatment, and the surface roughness thereof is less than 2 μm.

6. The respiratory valve sealing mechanism according to claim 1, wherein the containment seal (420) is a non-newtonian fluid foaming seal capable of resisting impact of the second cone tip (302) and capable of wrapping the second cone tip (302) when the valve disc falls back into contact with the second cone tip (302).

7. A burn-resistant breathing apparatus for a storage tank, comprising:

A main valve body (2);

a pressure valve arranged in the main valve body, the pressure valve comprising a pressure valve seat (3) fixed on the inner wall of the main valve body and a pressure valve disc (4) adaptable to the pressure valve seat, the pressure valve being capable of opening when the gas pressure in the tank exceeds a predetermined pressure of the pressure valve to reduce the gas pressure in the tank; and

the middle part of the pressure valve disc is provided with a suction hole (43), the vacuum valve is integrally arranged at the position of the suction hole, the vacuum valve comprises a mounting cover (11) arranged at the upper end of the suction hole, a vacuum valve seat (14) arranged in the suction hole and a vacuum valve disc (15), the vacuum valve disc is connected with the mounting cover through a balance spring (13), and can be tightly attached to the vacuum valve seat under the action of the balance spring to close the vacuum valve and can be downwards moved to be opened when the gas in the storage tank is at a negative pressure and is lower than the preset pressure of the vacuum valve so as to supplement the pressure in the gas in the storage tank;

wherein the breather valve seal mechanism according to any one of claims 1 to 6 is employed between the pressure valve disc and the pressure valve seat, and between the vacuum valve disc and the vacuum valve seat.

8. The fire resistant breathing apparatus of claim 7 wherein a fire resistant assembly (30) is provided at the upper opening of the main valve body, the fire resistant assembly comprising a heat insulating layer (17) and a fire resistant tray (16), the fire resistant tray (16) being disposed below the heat insulating layer (17),

the upper end of the main valve body is provided with a concave table-type annular disc (101), and the fire-resistant and fire-retarding component is fixedly arranged in the table-type annular disc.

9. The device of claim 7, wherein the pressure valve seat comprises an annular supporting plate (31) and a pressure valve seat body (32) which is configured into a cylinder shape, the pressure valve seat body is installed in an inner hole of the annular supporting plate in an interference fit manner, a first annular bulge (301 a) is configured at the upper end, a first annular sealing groove (401 a) is configured at the lower end face of the pressure valve disc, a first containing sealing ring (420 a) is installed in the first annular sealing groove (401 a),

the pressure valve disc is correspondingly arranged above the pressure valve seat body, can be seated on the pressure valve seat body, and forms a seal with the first annular sealing groove (401 a) through the first annular bulge (301 a), so that the pressure valve is closed, and can be lifted to open the pressure valve.

10. The storage tank burn-resistant breathing apparatus according to claim 7, wherein a lifting valve rod sleeve assembly is connected to the upper end of the pressure valve disc, the lifting valve rod sleeve assembly comprises a valve rod sleeve (9) and a pressure valve rod (7) which is installed in the valve rod sleeve in an adapting mode, the pressure valve rod is fixedly connected with the pressure valve disc, the valve rod sleeve is fixedly connected to the lower top end face of the main valve body, and the pressure valve disc can push the pressure valve rod to move in a lifting mode along the valve rod sleeve.

11. The tank burn-resistant breathing apparatus according to claim 7 or 10, wherein symmetrically distributed weight plates (5) are provided on the pressure valve disc, and the predetermined pressure of the pressure valve is adjusted by adjusting the weight of the weight plates.

12. The device of claim 7, wherein the vacuum valve seat (14) is configured in a cylinder shape, the vacuum valve seat is installed in the air suction hole in an interference fit manner, a second annular protrusion (301 b) is configured at the lower end of the vacuum valve seat, a second annular sealing groove (401 b) is configured at the upper end surface of the vacuum valve disc, a second containing sealing ring (420 b) is installed in the second annular sealing groove (401 b),

The vacuum valve disc can be tightly attached to the vacuum valve seat under the action of the balance spring, and a seal is formed between the second annular bulge (301 b) and the second annular sealing groove (401 b), so that the vacuum valve is closed, and the vacuum valve can be downwards moved under the action of air pressure to be opened.

13. The fire resistant breathing apparatus of the storage tank according to claim 7, wherein the mounting cover comprises a cylindrical body (111) and a top plate (112) arranged at the upper end of the cylindrical body, the upper end of the balance spring is fixedly connected with the top plate, the cylindrical body is provided with a plurality of ventilation holes (113),

the diameter of the cylindrical body is larger than that of the air suction hole, and the cylindrical body is fixed on the upper end face of the pressure valve disc and is communicated with the air suction hole.

14. The fire resistant breathing apparatus of the storage tank according to claim 13, wherein a spring stop collar (12) is provided in the cylindrical body, the spring stop collar is fixed on the lower end face of the top plate, and the balance spring is provided in the spring stop collar.