Diaphragm type sand-proof, frost-proof and fire-retardant integrated breather valve

Abstract

The utility model relates to the technical field of breather valves, in particular to a diaphragm type sand-proof anti-freezing fire-retardant integrated breather valve which comprises a valve seat covering a tank opening of a storage tank in a sealing mode, an air inlet hole is formed in the valve seat in a penetrating mode, a supporting ring is arranged on the outer side of the air inlet hole in a surrounding mode, and an annular groove is formed in the upper annular face of the supporting ring in a concave mode. A groove cavity of the annular groove is communicated with a tank cavity of the storage tank through an air guide pipe; a valve cover is installed on the valve seat, a breathing film capable of covering the air inlet hole and the annular groove is arranged between the valve cover and the valve seat in a clamped mode, and the air inlet end of the air inlet hole is provided with an inverted conical filter screen in a communicating mode so as to complete the breathing action capable of preventing sand in a matched mode. According to the utility model, the conical filter screen is communicated and mounted at the air inlet, so that impurities such as sand and dust are effectively prevented from entering the breather valve, and the cleanness and normal work of the valve body are ensured. Meanwhile, due to the design of the inverted conical filter screen, the filtering area is increased, the filtering efficiency is improved, sand and dust can slide down and be cleaned conveniently, and the maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of breathing valves, in particular to a diaphragm type anti-sand, anti-freezing and fire-blocking integrated breathing valve. Background Art

[0002] The main purpose of the breathing valve is to be installed at the mouth of the storage tank, and to be isolated from the atmosphere within a certain pressure range, and to be connected to the atmosphere when the pressure exceeds or falls below this pressure range. Commonly used breathing valves are generally composed of two parts: a negative pressure chamber and a positive pressure chamber, and the negative pressure chamber and the positive pressure chamber are arranged separately from each other. The breathing action of the breathing valve is as follows: when the gas pressure in the storage tank is greater than the external atmospheric pressure, the valve disc of the negative pressure chamber is compressed by the gas in the storage tank, and the valve disc of the positive pressure chamber is lifted up by the gas pressure in the storage tank, and the gas is released into the outside air. When the external atmospheric pressure is greater than the gas pressure in the storage tank, the valve disc of the positive pressure chamber is compressed, and the valve disc of the negative pressure chamber is lifted up by the atmosphere, and the gas enters the storage tank, so that the pressure inside and outside the storage tank is balanced.

[0003] Patent announcement number CN209041679U discloses a diaphragm-type antifreeze and anti-crystallization breathing valve. The breathing valve sets a polymer diaphragm as a valve disc, so that the polymer diaphragm plays a sealing role, which solves the problem of freezing and crystallization of oil, gas or water vapor between the traditional valve disc and the valve seat, so that the breathing valve can basically avoid freezing and crystallization, ensuring that the breathing valve can be ventilated smoothly and open normally.

[0004] The above-mentioned breathing valve is widely used in high-altitude cold areas due to its superior anti-freezing and anti-crystallization performance. However, during its use, it was found that in the spring in high-altitude cold areas, sandstorms are rampant, which will cause the sand, gravel and other debris to be easily adsorbed into the interior of the breathing valve when the breathing valve is inhaled, thereby polluting the materials, clogging the valve, and even scratching the diaphragm in severe cases, which will cause the sealing of the breathing valve to fail, causing toxic and harmful polluted gases to leak for a long time and pollute the environment. It can be seen that the current anti-sand treatment of the breathing valve is imminent. Utility Model Content

[0005] In order to avoid and overcome the technical problems existing in the prior art, the utility model provides a diaphragm-type sand-proof, anti-freeze and fire-proof integrated breathing valve, which can effectively prevent wind and sand from entering the breathing valve through the air inlet of the breathing valve, thereby further improving the safety of the use of the breathing valve.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] The diaphragm-type sand-proof, antifreeze and fire-resistant integrated breathing valve comprises a valve seat which is sealed and covered on the mouth of the storage tank, an air inlet hole is penetrated through the valve seat, a support ring is arranged around the outer side of the air inlet hole, an annular groove is concavely arranged on the upper ring surface of the support ring, and the groove cavity of the annular groove is connected with the tank cavity of the storage tank through an air guide pipe; a valve cover is installed on the valve seat, a breathing membrane which can cover the air inlet hole and the annular groove is sandwiched between the valve cover and the valve seat, and an inverted conical filter screen is installed at the air inlet end of the air inlet hole to cooperate in completing the breathing action that can prevent sand.

[0008] As a further solution of the utility model: the support ring is coaxially mounted on the top of the valve seat, and the inner hole in the center of the support ring constitutes the air inlet hole.

[0009] As a further solution of the utility model: the valve cover comprises an inner sleeve and an outer sleeve which are coaxially sleeved inside and outside, and the top ends of the inner sleeve and the outer sleeve are both sealed ends; the sealing cover at the barrel mouth of the bottom end of the inner sleeve is covered with an inner breathing membrane which can shrink or expand under the action of pressure, and the sealing cover at the barrel mouth of the bottom end of the outer sleeve is covered with an outer breathing membrane which can shrink or expand under the action of pressure; the valve cover is coaxially installed on the support ring, and the barrel mouths of the bottom ends of the inner sleeve and the outer sleeve are staggered and docked with the notch of the annular groove, the outer breathing membrane covers the outer edge of the notch of the annular groove, the inner breathing membrane covers the inner edge of the notch of the annular groove and at the same time covers the inner hole of the support ring; the inner breathing membrane is provided with a flow hole connecting the annular groove and the inner sleeve barrel cavity; the inner breathing membrane and the outer breathing membrane are integrally connected to form the breathing membrane.

[0010] As a further solution of the utility model: a coaxial sealing sleeve at the top end of the inner hole is provided with an inner valve ring, and the upper ring surface of the inner valve ring is a conical surface; a cover plate which can press the inner breathing membrane onto the upper ring surface of the inner valve ring is coaxially installed on the inner side surface of the inner breathing membrane, and a positioning groove is coaxially opened on the lower plate surface of the cover plate, and the upper ring surface of the inner valve ring can reversely press the inner breathing membrane into the positioning groove under the action of the gravity of the cover plate.

[0011] As a further solution of the utility model: an outer valve ring is coaxially arranged on the outer edge of the annular groove, and the upper ring surface of the outer valve ring is a conical surface, and the outer breathing membrane is covered on the upper ring surface.

[0012] As a further solution of the utility model: an inner positioning ring is coaxially fixed to the tube mouth at the bottom end of the inner sleeve, and the outer edge of the inner breathing membrane and the inner edge of the outer breathing membrane are coaxially sealed and clamped between the tube mouth at the bottom end of the inner sleeve and the inner positioning ring.

[0013] As a further solution of the utility model: an outer positioning ring is coaxially fixed to the tube mouth at the bottom end of the outer sleeve, and the outer edge of the outer breathing membrane is coaxially sealed and clamped between the tube mouth at the bottom end of the outer sleeve and the outer positioning ring.

[0014] As a further solution of the utility model: the tops of the inner sleeve and the outer sleeve cooperate to form a stepped structure with a high center and a low circumference.

[0015] As a further solution of the utility model: a ventilation cavity communicated with the tank cavity of the storage tank is formed inside the valve seat, and the ventilation cavity is communicated with the annular groove through an air guide pipe.

[0016] As a further solution of the utility model: lifting ears for lifting are fixedly installed on both sides of the support ring.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] 1. The utility model effectively prevents impurities such as sand and dust from entering the breathing valve by installing a conical filter at the air inlet, ensuring the cleanliness and normal operation of the valve body. At the same time, the design of the inverted conical filter not only increases the filtration area and improves the filtration efficiency, but also facilitates the sliding and cleaning of sand and dust, reducing maintenance costs.

[0019] 2. The filter holes on the filter net are evenly opened on the side, so that the airflow can pass evenly, avoiding local blockage and poor airflow, improving the filtration efficiency, and ensuring the stability and reliability of the breathing valve.

[0020] 3. The breathing valve realizes the double protection of the inner and outer breathing membranes through the ingenious combination of valve seat, valve cover, support ring, inner breathing membrane and outer breathing membrane, effectively preventing the leakage of sand and gas. At the same time, the staggered docking design of the inner sleeve and the outer sleeve allows the airflow to pass smoothly, ensures the sealing of the valve body, and improves the durability and safety of the breathing valve.

[0021] 4. The design of the inner valve ring and the cover plate enables the inner breathing membrane to be pushed into the positioning groove under the gravity of the cover plate, thus achieving the stable installation and positioning of the inner breathing membrane. This design not only improves the stability of the inner breathing membrane, but also ensures the accurate alignment of the flow holes, avoiding the problem of airflow obstruction.

[0022] 5. The design of the outer valve ring enables the outer breathing membrane to stably cover the outer edge of the annular groove, improving the sealing and stability of the breathing valve. At the same time, the conical surface design of the outer valve ring facilitates the fitting and disassembly of the outer breathing membrane, reducing the difficulty of maintenance.

[0023] 6. The fixed design of the inner positioning ring enables the edges of the inner and outer breathing membranes to be stably clamped between the tube mouth of the inner sleeve (or outer sleeve) and the inner positioning ring, ensuring the stable installation and sealing of the breathing membrane.

[0024] 7. The fixed design of the outer positioning ring further enhances the stability of the outer breathing membrane, avoids loosening or falling off caused by airflow impact, and improves the durability and reliability of the breathing valve.

[0025] 8. The tops of the coaxially connected inner sleeve and outer sleeve cooperate to form a stepped structure with high center and low periphery. This structure is not only beautiful, but also increases the stability of the valve cover and improves the overall performance of the breathing valve.

[0026] 9. The connecting design of the ventilation cavity and the air duct enables the gas in the tank cavity to be ventilated smoothly through the breathing valve, ensuring the normal operation of the tank.

[0027] 10. The lifting ears fixed on both sides of the support ring facilitate the lifting and transportation of the breathing valve, reduce the difficulty of installation and maintenance, improve the portability and practicality of the breathing valve, and make the breathing valve more convenient to use in various scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the internal structure of the utility model.

[0029] Figure 2 for Figure 1 A in the figure is an enlarged structural diagram.

[0030] Figure 3 It is a schematic diagram of the overall structure of the utility model.

[0031] In the figure: 1. valve seat; 11. ventilation cavity; 2. support ring; 21. annular groove; 22. inner valve ring; 23. outer valve ring; 24. inner hole; 25. lifting ear; 26. support seat; 3. air guide tube; 4. valve cover; 41. inner sleeve; 411. micro negative pressure cavity; 412. inner breathing membrane; 4121. flow hole; 413. inner positioning ring; 42. outer sleeve; 421. micro positive pressure cavity; 422. outer breathing membrane; 423. outer positioning ring; 424. filling valve; 425. liquid level gauge; 43. pressure plate; 44. connecting rod; 45. cover plate; 451. positioning groove; 452. gasket; 453. locking bolt; 454. locking nut; 5. filter screen. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] See also Figure 1 to Figure 3In the embodiment of the utility model, the diaphragm type anti-sand, anti-freezing and fire-proof integrated breathing valve includes a valve seat 1, a valve cover 4, an air guide pipe 3, a support ring 2 and a filter screen 5.

[0034] The valve seat 1 is used to cover the tank opening, and the flange at the bottom thereof is matched with the flange at the tank opening, and then is sealed and fixedly installed on the tank opening by bolts. A ventilation cavity 11 is formed inside the valve seat 1, which is connected to the inner cavity of the tank through the tank opening.

[0035] A support ring 2 is coaxially arranged on the top of the valve seat 1, and the bottom of the support ring 2 and the valve seat 1 are connected to each other through a plurality of metal air guide tubes 3, and the two ends of each air guide tube 3 are respectively connected to the ventilation cavity 11 and the annular groove 21 on the upper ring surface of the support ring 2. In this embodiment, four air guide tubes 3 are used, and the four air guide tubes 3 are sequentially distributed along the circumference of the valve seat 1 to form a four-legged support.

[0036] An outer valve ring 23 is coaxially sealed on the outer ring surface of the support ring 2, i.e., on the outer edge of the notch of the annular groove 21. An outer valve ring 23 is coaxially sealed on the inner ring surface of the support ring 2, i.e., in the inner hole 24. The upper ring surfaces of the outer valve ring 23 and the inner valve ring 22 are both conical surfaces. The mirror-grade conical surface cooperates with the breathing membrane made of nanomaterials to form a highly reliable sealing pair. This sealing pair utilizes the ultra-smooth surface and precise geometric shape of the mirror-grade conical surface to ensure the tight fit and uniform force of the sealing interface; at the same time, the breathing membrane made of nanomaterials further enhances the sealing effect and durability of the sealing pair with its ultra-thinness, high air permeability and excellent wear resistance, so it is called a highly reliable sealing pair. The surface of the breathing membrane has been specially treated, and it is not easy to sag or absorb any medium. In extremely cold weather, the valve seat 1 of the breathing valve and the surface of the breathing membrane will not freeze or crystallize. In addition, the breathing membrane has high flexibility. If a small amount of frost or crystals are produced on the surface of the metal valve seat 1, the exhaled pressure will blow them off during the breathing process of the breathing valve; at the same time, the conical surface plays a drainage role, further ensuring the long-term stable operation of the breathing valve.

[0037] Lifting ears 25 for lifting are fixedly installed on both sides of the support ring 2, which facilitates the lifting and transportation of the breathing valve, reduces the difficulty of installation and maintenance, improves the portability and practicality of the breathing valve, and enables the breathing valve to be more conveniently used in various scenarios.

[0038] A support seat 26 is installed on the other two sides of the support ring 2. The support seat 26 is used to cooperate with the pressure plate 43 on the valve cover 4. Then, the valve cover 4 is installed on the valve seat 1 by tightening with screws.

[0039] The valve cover 4 includes an inner sleeve 41 and an outer sleeve 42 which are coaxially sleeved inside and outside, and the inner sleeve 41 and the outer sleeve 42 are fixedly connected to each other through a plurality of connecting rods 44 arranged along the circumference of the inner sleeve 41. The top ends of the inner sleeve 41 and the outer sleeve 42 are both sealed ends, and the two top ends cooperate to form a stepped structure with a high center and a low circumference, which optimizes the external dimensions of the valve cover 4 and reduces the manufacturing cost. The barrel openings at the bottom ends of the inner sleeve 41 and the outer sleeve 42 are both located in the same plane and are covered by a breathing membrane that changes from the inside to the outside in a wavy manner. The breathing membrane located at the barrel opening of the inner sleeve 41 is called the inner breathing membrane 412, and the breathing membrane located at the barrel opening of the outer sleeve 42 is called the outer breathing membrane 422. The breathing membrane made of nanometers adopts the above-mentioned wavy structure and has a micro-positive pressure and micro-negative pressure flexible sealing surface. Among them, the wavy structure increases the contact area between the breathing membrane and the load medium, is more conducive to increasing the sealing specific pressure, and cooperates with the mirror-grade valve seat 1 to form a highly reliable seal. In addition, the wave-like structure still has high toughness and high ductility at low temperatures, which means that higher sealing performance can be achieved even at low temperatures.

[0040] In order to fix the breathing membrane on the sleeve, an outer positioning ring 423 coaxial with the outer sleeve 42 is installed at the tube mouth of the outer sleeve 42 by screwing, and the outer edge sealing clamp of the breathing membrane is arranged between the outer positioning ring 423 and the tube mouth of the outer sleeve 42. An inner positioning ring 413 is coaxially installed with the inner sleeve 41 at the tube mouth of the inner sleeve 41 by screwing, and the middle sealing clamp of the breathing membrane is arranged between the inner positioning ring 413 and the tube mouth of the inner sleeve 41. At this time, the clamping cavity formed between the outer sleeve 42 and the inner sleeve 41 forms a sealed cavity under the sealing cooperation of the outer breathing membrane 422. A liquid injection valve 424 and a liquid level gauge 425 are also installed on the top of the outer sleeve 42, and a certain amount of antifreeze is injected into the sealed cavity through the liquid injection valve 424, and the liquid level of the antifreeze in the sealed cavity is measured by the liquid level gauge 425, so as to adjust the pressure of the sealed cavity in real time according to the breathing state of the breathing valve, and improve the smoothness of breathing. At this time, the sealed cavity is filled with a certain amount of antifreeze, so its pressure is greater than the atmospheric pressure, so it is called a micro-positive pressure cavity 421. The inner sleeve 41 forms a micro-negative pressure cavity 411 with variable pressure under the sealing cooperation of the inner breathing membrane 412 and the flow holes 4121 uniformly opened circumferentially on the inner breathing membrane 412. A cover plate 45 is coaxially installed at the center of the inner surface of the inner breathing membrane 412, and a gasket 452 is coaxially installed at the center of the outer surface of the inner breathing membrane 412. The locking bolt 453 passes through the cover plate 45, the inner breathing membrane 412 and the gasket 452 in sequence, and is threadedly connected with the locking nut 454 to seal the cover plate 45 on the inner breathing membrane 412, so that when the valve cover 4 is covered on the valve seat 1, under the action of the gravity of the cover plate 45, it can cooperate with the upper ring surface of the inner valve ring 22 to press the inner breathing membrane 412 into the positioning groove 451, thereby improving the sealing degree of the inner hole 24 as the air inlet. A sand-proof net is coaxially and sealedly fixedly installed at the lower hole end of the inner hole 24. The sand-proof net is an inverted conical filter screen 5, and the bottom of the filter screen 5 is open, but its bottom is also pressed against the top of the valve seat 1 to form a sealed end. The filter holes on the filter screen 5 are evenly distributed on the side, and the aperture of the filter holes is determined according to the particle size of the wind and sand at the location.

[0041] Initial state:

[0042] When installing the valve cover 4, align the through hole on the pressure plate 43 with the threaded hole on the support seat 26, and then the screws pass through the through hole and are threadedly connected with the threaded hole to fix the valve cover 4 on the valve seat 1. At this time, the upper ring surface of the outer valve ring 23 is pressed against the outer side of the outer breathing membrane 422 from bottom to top, and the upper ring surface of the inner valve ring 22 is pressed against the outer side of the inner breathing membrane 412 from bottom to top. At the same time, the inner breathing membrane 412 is pressed in the annular groove 21 under the cooperation of the cover plate 45 and the inner valve ring 22.

[0043] Exhalation status:

[0044] When the gas pressure in the storage tank is greater than the external atmospheric pressure, the breathing valve is in the exhalation state. The gas in the storage tank first enters the ventilation chamber 11, and then enters the annular groove 21 through multiple air guide tubes 3. Then part of the gas enters the micro-negative pressure chamber 411 through the flow hole 4121, causing the micro-negative pressure chamber 411 to expand, so that under the action of the expansion pressure, the inner breathing membrane 412 is further pressed against the inner valve ring 22 through the cover plate 45, thereby improving the sealing of the air inlet; another part of the gas, under the action of pressure, lifts up the outer breathing membrane 422, so that a leaking gap is generated between the outer breathing membrane 422 and the outer valve ring 23, so that the gas can be discharged, thereby reducing the gas pressure in the storage tank and achieving the corresponding pressure balance.

[0045] Inhalation state:

[0046] When the gas pressure in the storage tank is less than the external atmospheric pressure, the breathing valve is in the inhalation state. Under the extrusion of atmospheric pressure, the gas in the micro-negative pressure chamber 411 enters the annular groove 21 through the flow hole 4121, and enters the storage tank through the air guide tube 3 and the ventilation chamber 11; when the gas in the micro-negative pressure chamber 411 gradually decreases, the micro-negative pressure chamber 411 presents a negative pressure state, and the cover plate 45 moves up under the action of negative pressure, so that an air intake gap appears between the inner breathing membrane 412 and the inner valve ring 22; then, the outside atmosphere is filtered through the filter screen 5 and enters the annular groove 21 through the air intake hole through the air intake gap, thereby increasing the gas pressure in the storage tank and achieving the corresponding pressure balance. During the air intake process, due to the antifreeze in the micro-positive pressure chamber 421 and its internal pressure, the outer breathing membrane 422 is always pressed against the outer valve ring 23, and is always in a sealed state.

[0047] 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 within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. Diaphragm type anti-sand, anti-freeze and fire-retardant integrated breathing valve, characterized in that: The invention comprises a valve seat (1) which is sealed and covered on the mouth of a storage tank, an air inlet hole is formed through the valve seat (1), a support ring (2) is arranged around the outer side of the air inlet hole, an annular groove (21) is arranged on the upper ring surface of the support ring (2), and the groove cavity of the annular groove (21) is connected with the tank cavity of the storage tank through an air guide pipe (3); a valve cover (4) is installed on the valve seat (1), a breathing membrane which can cover the air inlet hole and the annular groove (21) is sandwiched between the valve cover (4) and the valve seat (1), and an inverted conical filter screen (5) is installed in communication with the air inlet end of the air inlet hole to cooperate with and complete a breathing action capable of preventing sand.

2. The diaphragm type anti-sand, anti-freezing and fire-retardant integrated breathing valve according to claim 1 is characterized in that: The support ring (2) is coaxially mounted on the top of the valve seat (1), and the inner hole (24) at the center of the support ring (2) constitutes the air inlet hole.

3. The diaphragm type anti-sand, anti-freezing and fire-retardant integrated breathing valve according to claim 2 is characterized in that: The valve cover (4) comprises an inner sleeve (41) and an outer sleeve (42) which are coaxially sleeved inside and outside, and the top ends of the inner sleeve (41) and the outer sleeve (42) are both sealed ends; the sealing cover at the tube mouth of the bottom end of the inner sleeve (41) is provided with an inner breathing membrane (412) which can shrink inward or expand outward under the action of pressure, and the sealing cover at the tube mouth of the bottom end of the outer sleeve (42) is provided with an outer breathing membrane (422) which can shrink inward or expand outward under the action of pressure; the valve cover (4) is coaxially mounted on the support ring (2), and the inner sleeve (41) and the outer sleeve (42) are provided with a sealing cover at the tube mouth of the bottom end of the inner sleeve (41). The barrel openings at the bottom are all staggered and docked with the notches of the annular groove (21); the outer breathing membrane (422) covers the outer edge of the notch of the annular groove (21); the inner breathing membrane (412) covers the inner edge of the notch of the annular groove (21) and simultaneously covers the inner hole (24) of the support ring (2); the inner breathing membrane (412) is provided with a flow hole (4121) connecting the annular groove (21) and the barrel cavity of the inner sleeve (41); the inner breathing membrane (412) and the outer breathing membrane (422) are integrally connected to form the breathing membrane.

4. The diaphragm type anti-sand, anti-freezing and fire-retardant integrated breathing valve according to claim 3 is characterized in that: The inner valve ring (22) is coaxially provided at the top of the inner hole (24), and the upper ring surface of the inner valve ring (22) is a conical surface; the inner side surface of the inner breathing membrane (412) is coaxially provided with a cover plate (45) which can press the inner breathing membrane (412) onto the upper ring surface of the inner valve ring (22), and a positioning groove (451) is coaxially provided on the lower plate surface of the cover plate (45), and the upper ring surface of the inner valve ring (22) can reversely press the inner breathing membrane (412) into the positioning groove (451) under the action of the gravity of the cover plate (45).

5. The diaphragm type anti-sand, anti-freezing and fire-retardant integrated breathing valve according to claim 4 is characterized in that: An outer valve ring (23) is coaxially arranged on the outer edge of the notch of the annular groove (21) on the sealing sleeve. The upper ring surface of the outer valve ring (23) is a conical surface, and the outer breathing membrane (422) covers the upper ring surface.

6. The diaphragm type anti-sand, anti-freezing and fire-retardant integrated breathing valve according to claim 5 is characterized in that: An inner positioning ring (413) is coaxially fixedly connected to the tube mouth at the bottom end of the inner sleeve (41), and the outer edge of the inner breathing membrane (412) and the inner edge of the outer breathing membrane (422) are coaxially sealed and clamped between the tube mouth at the bottom end of the inner sleeve (41) and the inner positioning ring (413).

7. The diaphragm type anti-sand, anti-freezing and fire-retardant integrated breathing valve according to claim 6 is characterized in that: An outer positioning ring (423) is coaxially fixedly connected to the tube mouth at the bottom end of the outer sleeve (42), and the outer edge of the outer breathing membrane (422) is coaxially sealed and clamped between the tube mouth at the bottom end of the outer sleeve (42) and the outer positioning ring (423).

8. The diaphragm type anti-sand, anti-freezing and fire-retardant integrated breathing valve according to claim 7 is characterized in that: The tops of the inner sleeve (41) and the outer sleeve (42) cooperate to form a stepped structure with a high center and a low circumference.

9. The diaphragm type anti-sand, anti-freezing and fire-retardant integrated breathing valve according to claim 8 is characterized in that: A ventilation cavity (11) communicating with the tank cavity of the storage tank is formed inside the valve seat (1), and the ventilation cavity (11) is communicated with the annular groove (21) via the air guide pipe (3).

10. The diaphragm type anti-sand, anti-freezing and fire-retardant integrated breathing valve according to claim 9 is characterized in that: Lifting ears (25) for lifting are fixedly mounted on both sides of the support ring (2).

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