Storage tank breather valve

Abstract

The invention relates to the technical field of storage tank safety devices, and discloses a storage tank breather valve which comprises a valve body, a pressure cavity is defined by the upper portion of an inner cavity of the valve body through a pressure end valve hole, a vacuum cavity is defined by the lower portion of the inner cavity of the valve body through a partition plate and a vacuum end valve hole, the lower end of the valve body is an air inlet, and a first sealing structure is arranged on the pressure end valve hole. A first sealing structure is arranged on the vacuum end valve hole, a second sealing structure is arranged on the vacuum end valve hole, each of the first sealing structure and the second sealing structure comprises a valve seat, a valve disc, a sealing membrane and a membrane fixing circular plate, more than two annular grooves are formed in the lower surface of the valve disc, and the sealing membrane is arranged on the lower surface of the valve disc and covers the annular grooves; the membrane fixing circular plate is arranged in the middle of the lower surface of the valve disc and used for pressing the membrane sealing piece, the valve seat is provided with more than two sealing pointed cones, and the sealing pointed cones and the annular grooves are arranged correspondingly. According to the storage tank breather valve, complete sealing can be achieved, and the zero-leakage sealing effect of the breather valve is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of storage tank safety devices, and in particular to a storage tank breathing valve. Background Art

[0002] As one of the safety accessories of storage tanks, the function of the breathing valve is to reduce the evaporation loss of volatile liquids in normal pressure and low pressure storage tanks. The breathing valve can not only maintain the air pressure balance in the tank to ensure that the tank is not damaged when it is overpressured or underpressured, but also use the pressure bearing capacity of the tank itself to reduce the volatilization and loss of the medium in the tank, which plays an important role in safety and environmental protection.

[0003] Under normal working conditions, when the storage tank outputs materials, the breathing valve starts to inhale air into the tank; when filling materials into the storage tank, the breathing valve starts to exhale the gas in the tank to the outside of the tank; due to climate change and other reasons, the vapor pressure of the material in the tank increases or decreases, and the breathing valve exhales steam or inhales air or nitrogen. The sealing structure of the existing breathing valves all adopts a single pointed cone structure valve seat, the sealing performance is unstable, and there is a leakage problem after long-term use; and the sealing structure of the existing breathing valve uses PTFE or FEP film as a sealing diaphragm for sealing. The durability of these two materials is poor, and they cannot self-recover after deformation, resulting in a prominent leakage problem of the breathing valve, exceeding 2000ppm; in addition, as the use time of the breathing valve increases, the valve disc is repeatedly impacted by the medium steam in the storage tank, causing the valve disc to gain weight, and often jamming, sticking, and clogging; in addition, the existing integrated structure breathing valve and split structure breathing valve cavity are asymmetrically designed, and the valve disc is always in an eccentric state after opening, which is prone to jamming and valve stem fracture.

[0004] To sum up, the current breathing valve sealing structure and materials have leakage problems after long-term use, and the valve disc is in an eccentric state when opened, resulting in unstable airflow. Once the breathing valve has an abnormal operating condition, there will be major safety hazards and environmental risks in the storage and transportation tank area. Therefore, it is urgent to develop a zero-leakage self-stabilizing sealing structure and its breathing valve device to achieve zero leakage and self-stabilization of the breathing valve, solve safety hazards, meet safety and environmental protection requirements, and ensure personal and property safety. Summary of the invention

[0005] The purpose of the present invention is to overcome the problem of leakage of the tank breathing valve in the prior art after long-term use, and to provide a new tank breathing valve. According to the tank breathing valve of the present invention, zero leakage can be achieved, potential safety hazards can be solved, and safety and environmental protection requirements can be met to ensure personal and property safety.

[0006] In order to achieve the above-mentioned objectives, the present invention provides a tank breathing valve, including a valve body, the upper part of the inner cavity of the valve body is defined by a pressure cavity through a pressure end valve hole, the lower part of the inner cavity of the valve body is defined by a vacuum cavity through a partition and a vacuum end valve hole, the lower end of the valve body is an air inlet, a first sealing structure is arranged on the pressure end valve hole, and a second sealing structure is arranged on the vacuum end valve hole, wherein the first sealing structure and the second sealing structure each include a valve seat, a valve disc, a sealing diaphragm and a solid film circular plate, more than two annular grooves are formed on the lower surface of the valve disc, the sealing diaphragm is arranged on the lower surface of the valve disc and covers the annular grooves, the solid film circular plate is arranged in the middle of the lower surface of the valve disc for pressing the sealing diaphragm, the valve seat has more than two sealing pointed cones, the top of the sealing pointed cones faces upward, and the sealing pointed cones on the valve seat and the annular grooves on the valve disc are arranged corresponding to each other.

[0007] Preferably, the number of the sealing cone on the valve seat and the annular groove on the valve disc are both two, the annular groove located on the inner ring is a level I annular groove, and the annular groove located on the outer ring is a level II annular groove.

[0008] Preferably, the sealing tip cone configured corresponding to the level I annular groove is a low-peak sealing tip cone, and the sealing tip cone configured corresponding to the level II annular groove is a high-peak sealing tip cone, and the height of the high-peak sealing tip cone is greater than the height of the low-peak sealing tip cone.

[0009] Preferably, the ring diameters of the low-peak sealing cones in the first sealing structure and the second sealing structure are both equal to the diameter of the air inlet at the lower end of the valve body.

[0010] Preferably, the height h of the low peak sealing cone is 1 The height h of the peak sealing cone 2 The relationship between them is: 2 =h 1 +a, where a is 0.1-0.8mm.

[0011] Preferably, the inner angles of the low-peak sealing cone and the high-peak sealing cone are 45-75°, and the cones are rounded with a diameter of 0.1-0.3 mm.

[0012] Preferably, a non-Newtonian fluid buffer ring is provided in the level II annular groove.

[0013] Preferably, the non-Newtonian fluid buffer ring is made of polyurethane elastomer.

[0014] Preferably, the waistlines of the level I annular groove and the level II annular groove are S-shaped.

[0015] Preferably, the upper and lower curvatures of the waistlines of the level I annular groove and the level II annular groove are 1.1-1.2 rad.

[0016] Preferably, the center ring diameter D of the first-level annular groove is 1 and the center ring diameter D of the II-level annular groove 2 The relationship between them is: 2 =D 1 +b, where b is 14-30mm.

[0017] Preferably, the width of the level I annular groove is 5-8 mm.

[0018] Preferably, the width of the level II annular groove is 8-12 mm.

[0019] Preferably, the depths of the level I annular groove and the level II annular groove are respectively 2.5-3.2 mm.

[0020] Preferably, the sealing membrane comprises a polymer layer and a fluororubber layer.

[0021] Preferably, the polymer layer is made of polytetrafluoroethylene.

[0022] Preferably, the sealing membrane has a thickness of 0.5-1.1 mm.

[0023] Preferably, the hardness of the sealing membrane is HR50-HR75.

[0024] Preferably, the sealing membrane is in a ring shape.

[0025] Preferably, a plurality of rotor wings are formed along the outer circumference of the lower surface of the valve disc.

[0026] Preferably, adjacent rotors are arranged staggered with each other.

[0027] Preferably, the radian of each rotor is 0.3 rad to 0.4 rad.

[0028] Preferably, the gap between two adjacent rotors is 3-6 mm.

[0029] Preferably, the number of the rotors is 15-20.

[0030] Preferably, in the first sealing structure, a first telescopic valve stem structure is arranged on the valve disc, the upper end of the first telescopic valve stem structure is fixed to the top of the pressure chamber, and the lower end is connected to the upper surface of the valve disc.

[0031] Preferably, the first retractable valve stem structure includes a valve stem, a rod sleeve and a valve stem positioning sleeve, the rod sleeve is arranged on the outside of the valve stem, and a plurality of rows of first ceramic balls are arranged inside the valve stem positioning sleeve. The valve stem equipped with the valve sleeve can move up and down along the ceramic balls in the valve stem positioning sleeve.

[0032] Preferably, central axes of the valve stem positioning sleeve, the valve disc of the first sealing structure and the pressure-end valve hole overlap.

[0033] Preferably, the top of the valve stem positioning sleeve is fixed by a fixing cross ring.

[0034] Preferably, in the second sealing structure, a second retractable valve stem structure is arranged under the valve disc, and the second retractable valve stem structure includes an I-type valve stem and a cross positioning ring, the I-type valve stem passes through the cross positioning ring, and the upper end of the I-type valve stem is fixed on the valve disc, and the cross positioning ring is fixed to the vacuum end valve hole through the cross disc, and a plurality of rows of second ceramic balls are arranged inside the cross positioning ring, and the I-type valve stem can move up and down along the ceramic balls in the cross positioning ring.

[0035] Preferably, central axes of the cross positioning ring, the valve disc of the second sealing structure and the vacuum end valve hole overlap.

[0036] Preferably, the circumference of the lower end of the valve body is arranged as an arc structure.

[0037] Preferably, the left side of the bottom partition of the vacuum chamber is configured as an arc structure.

[0038] Preferably, a vacuum fire-blocking disk is provided on the side of the vacuum cavity, and the vacuum fire-blocking disk is correspondingly provided with a vacuum rainproof cover.

[0039] Preferably, a pressure fire-retardant disk is provided on the top of the pressure cavity, and the pressure fire-retardant disk is correspondingly provided with a pressure rain cover.

[0040] Preferably, a pressure pipe flame arrester and a pipe flange are provided on the side of the pressure chamber.

[0041] According to the storage tank breathing valve of the present invention, a sealing structure is provided on both the pressure end valve hole and the vacuum end valve hole, and the valve disc of the sealing structure is formed with more than two annular grooves, and the valve seat is provided with more than two sealing cones, and the sealing cones are arranged one-to-one with the annular grooves; and the valve disc is also provided with a sealing diaphragm covering the annular grooves. Through such a structural configuration, a complete seal can be achieved between the valve disc and the valve seat, achieving a zero-leakage sealing effect of the breathing valve.

[0042] In a more preferred embodiment, a non-Newtonian fluid buffer ring is arranged in the annular groove of the outer ring of the valve disc, which can slowly contain the sealing cone when the valve disc is in a static state, thereby achieving a better sealing effect.

[0043] In another preferred embodiment, a composite sealing diaphragm composed of a polymer layer and a fluororubber layer is used. It has the advantages of efficient sealing, high elasticity, and corrosion resistance. It has self-recovery properties, which solves the problem that plastic deformation of plastic materials such as FEP cannot be recovered, and can achieve efficient sealing over a long life cycle.

[0044] In another more preferred embodiment, a plurality of rotor structures are formed on the periphery of the valve disc, so that the valve disc can rotate after being opened, so that the dirt and dust accumulated above the valve disc can be spun off by centrifugal force to achieve self-cleaning; in addition, the valve disc can remain self-stable after opening, solving the problem of valve disc eccentricity. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a structural schematic diagram of the sealing structure in the storage tank breathing valve of the present invention;

[0046] Figure 2 It is a structural schematic diagram of the valve disc in the storage tank breathing valve of the present invention;

[0047] Figure 3 It is a schematic diagram of the valve disc in the storage tank breathing valve of the present invention;

[0048] Figure 4 It is a structural schematic diagram of a sealing diaphragm in a storage tank breathing valve according to the present invention;

[0049] Figure 5 It is a schematic diagram of the installation of the sealing structure on the pressure end valve hole in the storage tank breathing valve of the present invention;

[0050] Figure 6 It is a structural schematic diagram of a valve stem connected to a sealing structure on a valve hole at the pressure end;

[0051] Figure 7 It is a schematic diagram of the installation of the sealing structure on the vacuum end valve hole in the storage tank breathing valve of the present invention;

[0052] Figure 8 It is a structural schematic diagram of a valve stem connected to a sealing structure on a valve hole at a vacuum end;

[0053] Fig. 9 A schematic structural diagram of an embodiment of the storage tank breathing valve of the present invention;

[0054] Fig.10 A schematic structural diagram of another embodiment of the storage tank breathing valve of the present invention.

[0055] Description of Reference Numerals

[0056] 1. Valve hole at pressure end; 2. Fastener; 3. O-ring; 4. Valve seat; 5. Sealing diaphragm; 6. Solid film disc; 7. Valve disc fastening screw; 8. Valve disc; 9. Non-Newtonian fluid buffer ring; 10. Valve stem; 11. Stem sleeve; 12. Valve stem positioning sleeve; 121. First ceramic ball; 13. Valve hole at vacuum end; 41. Low peak sealing cone; 42. High peak sealing cone; 51. Polymer layer; 52. Fluororubber layer; 81. Rotor; 82. I-level annular concave Groove; 83, II-level annular groove; 15, cross positioning ring; 16, fastening nut; 17, I-type valve stem O-ring; 18, I-type valve stem; 151, cross plate; 152, second ceramic ball; 20, inner common cavity; 21, vacuum cavity; 25, pressure cavity; 22, vacuum flame arrester; 23, vacuum rain cover; 26, fixed cross ring; 27, pressure flame arrester; 28, pressure rain cover; 30, pressure pipeline flame arrester; 31, pipeline flange. DETAILED DESCRIPTION

[0057] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0058] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, unless otherwise specified, features defined as "first" and "second" may explicitly or implicitly include one or more of the features; "plurality" means two or more. The term "including" and any variation thereof means non-exclusive inclusion, and one or more other features, integers, steps, operations, units, components and / or combinations thereof may exist or be added.

[0059] In addition, terms indicating orientation or positional relationships, such as “center,” “lateral,” “up,” “down,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inside,” and “outside,” are described based on the orientation or relative positional relationships shown in the accompanying drawings and are merely simplified descriptions for the convenience of describing the present application. They do not indicate that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limitations on the present application.

[0060] In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internally connected between two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0061] like Figure 1-10 As shown, the storage tank breathing valve described in the present invention includes a valve body, the upper part of the inner cavity of the valve body is defined by a pressure cavity 25 through a pressure end valve hole 1, and the lower part of the inner cavity of the valve body is defined by a vacuum cavity 21 through a partition and a vacuum end valve hole 13, the lower end of the valve body is an air inlet, a first sealing structure is arranged on the pressure end valve hole 1, and a second sealing structure is arranged on the vacuum end valve hole 13, wherein the first sealing structure and the second sealing structure each include a valve seat 4, a valve disc 8, a sealing diaphragm 5 and a solid film circular plate 6, more than two annular grooves are formed on the lower surface of the valve disc 8, the sealing diaphragm 5 is arranged on the lower surface of the valve disc 8 and covers the annular grooves, the solid film circular plate 6 is arranged in the middle of the lower surface of the valve disc 8, and is used to press the sealing diaphragm 5, the valve seat 4 has more than two sealing cones, the top of the sealing cones faces upward, and the sealing cones on the valve seat 4 and the annular grooves on the valve disc 8 are arranged corresponding to each other.

[0062] In this article, the "upper part" of the inner cavity of the valve body refers to the part from above 60% height position of the valve body to the top in the height direction of the valve body.

[0063] Herein, the "lower portion" of the inner cavity of the valve body refers to a portion from below the 50% height position of the valve body to above the 10% height position of the valve body in the height direction of the valve body.

[0064] According to the storage tank breathing valve described in the present invention, in the sealing structure arranged on the pressure end valve hole 1 and the vacuum end valve hole 13, the sealing cone on the valve seat extends into the annular groove on the valve disc, and under the cooperation of the sealing diaphragm, complete sealing can be achieved to achieve zero leakage.

[0065] In the tank breathing valve of the present invention, the number of the sealing cone on the valve seat 4 and the annular groove on the valve disc 8 can be two or more, specifically, for example, two, three, four or more. The more the number of the sealing cone and the annular groove, the better the sealing effect, but the higher the production cost of the valve seat 4 and the valve disc 8. Therefore, in order to balance the sealing effect and the production cost, in a preferred case, the number of the sealing cone on the valve seat 4 and the annular groove on the valve disc 8 are both two.

[0066] When the number of the sealing cone on the valve seat 4 and the number of the annular groove on the valve disc 8 are both two, the annular groove located on the inner ring is the level I annular groove 82, and the annular groove located on the outer ring is the level II annular groove 83. Further preferably, the sealing cone corresponding to the level I annular groove 82 is the low-peak sealing cone 41, and the sealing cone corresponding to the level II annular groove 83 is the high-peak sealing cone 42, and the height of the high-peak sealing cone 42 is greater than the height of the low-peak sealing cone 41.

[0067] When the number of the sealing cones on the valve seat 4 and the annular grooves on the valve disc 8 is greater than two (such as three, four or more), preferably, the innermost sealing cone is a low-peak sealing cone, and at least one of the other sealing cones except the innermost sealing cone is a high-peak sealing cone; more preferably, the outermost sealing cone is a high-peak sealing cone, and the other sealing cones except the outermost sealing cone are low-peak sealing cones.

[0068] By configuring the height of the sealing cone in the above manner, a better sealing effect can be obtained.

[0069] More preferably, the height h of the low peak sealing cone is 1 The height h of the peak sealing cone 2 The relationship between them is: 2 =h 1 +a, wherein a is 0.1-0.8 mm, preferably 0.3-0.6 mm, more preferably 0.4-0.5 mm. In some embodiments, the height h of the low peak sealing cone is 1 is 2.8-3.2 mm, and most preferably is 2.8 mm; the height h of the peak sealing cone 2 3-3.6mm, most preferably 3.2mm.

[0070] In the tank breathing valve described in the present invention, preferably, the inner angles of the low-peak sealing cone and the high-peak sealing cone are 45-75°, more preferably 50-70°, and most preferably 60°.

[0071] In the tank breathing valve described in the present invention, preferably, the tips of the low-peak sealing cone and the high-peak sealing cone are processed into arcs so that the arc diameter of the tips is 0.1-0.3 mm.

[0072] In the storage tank breathing valve of the present invention, preferably, a non-Newtonian fluid buffer ring 9 is arranged in at least one annular groove on the valve disc (8). With such a structural arrangement, the non-Newtonian fluid buffer ring 9 has the characteristics of slowly sinking when slightly touched and rebounding quickly when strongly touched, and can well contain the sealing cone slowly when the valve disc 8 is in a static state, and protect the sealing diaphragm 5 when the impact force of the valve disc 8 is large after it is opened, thereby reducing impact damage.

[0073] In a more preferred embodiment, when the valve seat 4 is provided with a high peak sealing cone and a low peak sealing cone, a non-Newtonian fluid buffer ring 9 is provided in an annular groove on the valve disc corresponding to the high peak sealing cone.

[0074] In a specific implementation, when the number of the sealing cone on the valve seat 4 and the number of the annular groove on the valve disc 8 are both two, a non-Newtonian fluid buffer ring 9 is provided in the II-level annular groove 83 .

[0075] In the storage tank breathing valve of the present invention, the material of the non-Newtonian fluid buffer ring 9 is preferably polyurethane elastomer.

[0076] In the tank breathing valve of the present invention, preferably, the waistline of the I-level annular groove 82 and the II-level annular groove 83 is S-shaped. Such a structural design can reduce the pressure of the outer contour of the annular groove on the sealing diaphragm when the sealing diaphragm 5 is concave, thereby reducing the wear of the sealing diaphragm. In a more preferred embodiment, the upper and lower curvatures of the waistline of the I-level annular groove 82 and the II-level annular groove 83 are 1.1-1.2 rad, and most preferably 1.15 rad.

[0077] In the tank breathing valve of the present invention, preferably, the center ring diameter D of the first-level annular groove 82 is 1 and the center ring diameter D of the II-level annular groove 83 2 The relationship between them is: 2 =D 1 +b, wherein b is 14-30 mm, preferably 16-26 mm, more preferably 18-24 mm, and most preferably 20 mm.

[0078] In a preferred embodiment, when the diameter of the air inlet at the lower end of the valve body of the storage tank breathing valve is D, the center ring diameter D of the first-level annular groove 82 is 1 =D, and at the same time, the ring diameter of the low-peak sealing cone 41 in the first sealing structure and the second sealing structure is equal to the diameter of the air inlet.

[0079] In the storage tank breathing valve of the present invention, preferably, the width of the level I annular groove 82 is 5-8 mm, most preferably 6 mm.

[0080] In the storage tank breathing valve of the present invention, preferably, the depth of the level I annular groove 82 is 2.5-3.2 mm, most preferably 2.8 mm.

[0081] In the storage tank breathing valve of the present invention, preferably, the width of the II-level annular groove 83 is 8-12 mm, and most preferably is 10 mm.

[0082] In the storage tank breathing valve of the present invention, preferably, the depth of the II-level annular groove 83 is 2.5-3.2 mm, and most preferably is 2.8 mm.

[0083] In the tank breathing valve of the present invention, the valve seat 4 is an integrally formed structure, and the height of the valve seat 4 is designed to be 30-40 mm, preferably 32-38 mm, and most preferably 35 mm. Through such a valve seat structure design, the strength can be maintained, and the deformation can be controlled to be less than 0.1%, ensuring that the sealing structure can obtain a better sealing effect.

[0084] In the tank breathing valve of the present invention, preferably, the sealing diaphragm 5 includes a polymer layer 51 and a fluororubber layer 52. The material of the polymer layer 51 is preferably polytetrafluoroethylene. In a more preferred embodiment, the sealing diaphragm 5 is formed by vulcanizing and gluing a polytetrafluoroethylene diaphragm and a fluororubber diaphragm. In this embodiment, the sealing diaphragm 5 has the dual advantages of low leakage rate of the polytetrafluoroethylene diaphragm and high elasticity of the fluororubber diaphragm, which is more conducive to obtaining a zero-leakage sealing effect.

[0085] In the storage tank breathing valve of the present invention, preferably, the thickness of the sealing diaphragm 5 is 0.5-1.1 mm, and most preferably is 0.9 mm.

[0086] In the storage tank breathing valve described in the present invention, preferably, in the sealing diaphragm 5, the ratio of the thickness of the polymer layer 51 to the fluororubber layer 52 is 1:1-4, specifically, for example, it can be 1:1, 1:1.2, 1:1.4, 1:1.5, 1:1.6, 1:1.8, 1:2, 1:2.2, 1:2.4, 1:2.5, 1:2.6, 1:2.8, 1:3, 1:3.2, 1:3.4, 1:3.6, 1:3.8 or 1:4.

[0087] In the storage tank breathing valve of the present invention, preferably, the hardness of the sealing diaphragm 5 is HR50-HR75, and most preferably HR60.

[0088] In the tank breathing valve of the present invention, the sealing diaphragm 5 is annular. The size design of the annular sealing diaphragm ensures that it can cover all the annular grooves on the valve disc 8.

[0089] In the storage tank breathing valve described in the present invention, the coverage range of the sealing diaphragm 5 is not particularly limited, as long as it can completely cover all the annular grooves on the valve disc 8. In a preferred case, the coverage range of the sealing diaphragm 5 is such that when the sealing cone on the valve seat fully enters the annular groove on the valve disc, the outer periphery and inner periphery of the sealing diaphragm 5 can still completely cover the outermost annular groove and the innermost annular groove on the valve disc, respectively. In some embodiments, when the sealing diaphragm 5 is annular, the outer diameter of the sealing diaphragm is 1-30 mm larger than the outer diameter of the outermost annular groove on the valve disc 8, preferably 5-20 mm larger; the inner diameter of the sealing diaphragm is 1-30 mm smaller than the inner diameter of the innermost annular groove on the valve disc 8, preferably 5-20 mm smaller.

[0090] In the tank breathing valve described in the present invention, preferably, a plurality of rotor wings 81 are formed along the outer periphery of the lower surface of the valve disc 8 .

[0091] In this context, the "lower surface" of the valve disc 8 refers to the lower surface of the valve disc in the installed state, specifically Figure 1 shown.

[0092] According to the tank breathing valve described in the present invention, a plurality of rotor structures are formed on the outer periphery of the valve disc, so that the valve disc can rotate after being opened, so that the dirt and dust accumulated above the valve disc can be spun off by centrifugal force to achieve self-cleaning; in addition, the valve disc can maintain self-stability after opening, solving the problem of valve disc eccentricity.

[0093] In the tank breathing valve of the present invention, the number of the rotors 81 may be 15-20, and most preferably 17. The rotors 81 may be vertically arranged on the outer periphery of the valve disc 8 .

[0094] In the tank breathing valve described in the present invention, adjacent rotors are arranged in a staggered manner. Specifically, a gap is formed between adjacent rotors, and a partial overlap is formed in the radial direction. In a specific embodiment, the gap c between two adjacent rotors can be 3-6 mm, and most preferably 5 mm. In the radial direction of the valve disc, the overlapping portion between two adjacent rotors accounts for 1-30% of the rotor, preferably 5-20%.

[0095] In the tank breathing valve of the present invention, the radian k of the rotor 81 may be 0.3 rad to 0.4 rad, preferably 0.32 rad to 0.38 rad, and most preferably 0.36 rad.

[0096] In the tank breathing valve of the present invention, in a preferred embodiment, when the diameter of the air inlet of the tank breathing valve is D, the outer diameter D of the valve disc is 3 =D+(40mm~60mm), rotor radius R4 =(0.15~0.25)*D, the height of the rotor is 0.628*(0.1*D+12)mm. This design can make the valve disc rise to the maximum height at 1.07 times the opening pressure. At the same time, after opening, the valve disc can rotate at a speed of 20-30r / s to keep the valve disc self-stable, and can use centrifugal force to spin off the dirt and dust accumulated above the valve disc to achieve self-cleaning.

[0097] In the tank breathing valve of the present invention, in a preferred embodiment, a circular ring structure is provided at the bottom or side of the rotors to connect the rotors together so as to keep the valve disc from being deformed. The width of the circular ring structure can be 5-10 mm, and most preferably 8 mm.

[0098] In the tank breathing valve described in the present invention, the valve disc body, the rotor 81 and the ring structure used to connect the rotor into one are an integrally formed structure, and its material can be corrosion-resistant materials such as stainless steel or polyphenylene sulfide.

[0099] In the storage tank breathing valve described in the present invention, the valve seat 4 is installed on the valve hole (such as the pressure end valve hole 1 or the vacuum end valve hole 13). Specifically, an O-ring 3 is arranged between the upper end of the valve hole and the valve seat 4, and is fixed by a fastener 2 (such as a fastening screw). According to such a valve seat installation method, the defects existing in the existing basic valve seat installation methods (such as liquid nitrogen cold installation or metal glue sealing) can be overcome. Specifically, there is a slight deformation after the liquid nitrogen cold installation is completed, and the metal glue sealing has a problem of poor sealing and leakage, and both the liquid nitrogen cold installation and the metal glue sealing have the problem of being unable to be disassembled and repaired.

[0100] In the first sealing structure installed on the pressure end valve hole 1, the valve seat 4 is installed on the pressure end valve hole 1, an O-ring 3 is arranged between the upper end of the pressure end valve hole 1 and the valve seat 4, and the valve seat 4 is fixed to the pressure end valve hole by a plurality of (such as 4) fasteners (such as fastening screws). A first telescopic valve stem structure is arranged on the valve disc 8, the upper end of the first telescopic valve stem structure is fixed to the top of the breathing valve body, and the lower end is connected (such as spiral connection) to the upper surface of the valve disc 8. The sealing diaphragm 5 is arranged on the lower surface of the valve disc 8 and is pressed by the solid film circular plate 6 and the valve disc fastening screw 7. In a preferred case, the first telescopic valve stem structure includes a valve stem 10, a rod sleeve 11 and a valve stem positioning sleeve 12, the rod sleeve 11 is arranged outside the valve stem 10, and a plurality of rows (such as 4 rows) of first ceramic balls 121 are arranged inside the valve stem positioning sleeve 12, and the valve stem 10 equipped with the valve sleeve can move up and down along the ceramic balls in the valve stem positioning sleeve 12. Preferably, the central axes of the valve stem positioning sleeve 12 , the valve disc 8 and the pressure end valve hole 1 overlap. Preferably, the top of the valve stem positioning sleeve 12 is fixed by a fixing cross ring 26 .

[0101] In the present invention, the valve stem 10 is preferably made of stainless steel.

[0102] In the present invention, the material of the rod sleeve 11 is preferably PEEK (polyetheretherketone) composite graphite material. The rod sleeve made of PEEK composite graphite material can prevent the exhaled medium of the breathing valve from corroding the valve stem 10. At the same time, the rod sleeve of this material has excellent self-lubrication, static conductivity and low temperature resistance, and can realize the normal use of the breathing valve at a low temperature of -40°C.

[0103] In the present invention, the valve stem positioning sleeve 12 is used to control the displacement movement of the valve stem 10 and the rod sleeve 11. The valve stem positioning sleeve 12 is located in the center position. At the same time, 4 rows of 5 to 20 ceramic balls are longitudinally distributed inside the valve stem positioning sleeve 12. The particle size of the ceramic balls is 2 mm to 4 mm. The distance between the rod sleeve 11 and the surrounding ceramic balls is 0.08-0.12 mm (preferably 0.1 mm). The ceramic balls in the valve stem positioning sleeve 12 can effectively convert any lateral force of the valve stem 10 and the rod sleeve 11 into longitudinal force, avoid eccentric rotation of the valve disc 8, and can keep the coaxiality deviation of the valve disc 8 less than 0.05 mm when the valve disc 8 returns to the seat, so that the valve disc 8 and the valve seat 4 are completely sealed.

[0104] In the present invention, the opening pressure P of the pressure end breathing valve is adjusted by the total weight M of the valve disc 8, the non-Newtonian fluid buffer ring 9, the sealing diaphragm 5, the solid film disc 6, the valve disc fastening screw 7, the valve stem 10 and the stem sleeve 11. 1 , P 1 =1.27*Mg / D, where D is the diameter of the air inlet at the lower end of the valve body of the tank breathing valve.

[0105] In the second sealing structure installed on the vacuum end valve hole 13, the valve seat 4 is installed on the vacuum end valve hole 13, an O-ring 3 is arranged between the upper end of the vacuum end valve hole 13 and the valve seat 4, and the valve seat 4 is fixed to the vacuum end valve hole 13 by a plurality of (e.g., 4) fasteners (e.g., fastening screws). A second telescopic valve stem structure is arranged below the valve disc 8, the second telescopic valve stem structure includes an I-type valve stem 18 and a cross positioning ring 15, the I-type valve stem 18 penetrates the cross positioning ring 15, and the upper end of the I-type valve stem 18 is fixed to the valve disc 8, the cross positioning ring 15 is fixed to the vacuum end valve hole 13 by a cross disc 151 (specifically, the cross disc 151, the valve seat 4 and the vacuum end valve hole 13 are fixed together by fasteners), and a plurality of rows (e.g., 4 rows) of second ceramic balls 152 are arranged inside the cross positioning ring 15, and the I-type valve stem 18 can move up and down along the ceramic balls in the cross positioning ring 15. Further preferably, the I-shaped valve stem 18 passes through the valve disc 8, the solid film circular plate 6 and the cross positioning ring 15 from top to bottom in sequence, and an I-shaped valve stem O-ring 17 is provided between the upper end of the I-shaped valve stem 18 and the valve disc 8; on the lower surface of the valve disc 8, the solid film circular plate 6 is tightened by a fastening nut 16. Further preferably, the central axes of the cross positioning ring 15, the valve disc 8 and the vacuum end valve hole overlap.

[0106] In the present invention, an I-shaped valve stem 18 is installed at the center position of the valve disc 8. The I-shaped valve stem 18 is made of stainless steel and passes through the valve disc 8, the solid film circular plate 6, the fastening nut 16 and the (vacuum valve stem) cross positioning ring 15 from top to bottom. An I-shaped valve stem O-ring 17 is arranged between the upper end cap of the I-shaped valve stem 18 and the valve disc 8. The fastening nut 16 is tightened by rotation, and the I-shaped valve stem O-ring 17 is deformed to realize the sealing of the stamped rotor valve disc 14.

[0107] In the present invention, the four ends of the cross disk 151 of the (vacuum valve stem) cross positioning ring 15 are installed on the vacuum end valve hole through the valve seat fastening screws, and a trap is set at the center position of the (vacuum valve stem) cross positioning ring 15. 4 rows of 5 to 9 ceramic balls distributed longitudinally are set inside the trap. The particle size of the ceramic balls is 2mm to 4mm. The distance between the I-type valve stem 18 and the surrounding ceramic balls is 0.08-0.12mm (preferably 0.1mm). The ceramic balls 151 in the (vacuum valve stem) cross positioning ring 15 can effectively convert any lateral force of the I-type valve stem 18 into longitudinal force, avoid eccentric rotation of the valve disc 8, and can keep the coaxiality deviation of the valve disc 8 less than 0.05mm when the valve disc 8 returns to the seat, so that the valve disc 8 and the valve seat 4 are completely sealed.

[0108] In the present invention, in a more preferred embodiment, the valve disc 8 used for the second sealing structure is formed by stamping, and is also called a stamped rotor valve disc.

[0109] In the present invention, the opening pressure P of the vacuum end breathing valve is adjusted by the total weight M of the stamped rotor valve disc, the non-Newtonian fluid buffer ring 9, the sealing diaphragm 5, the solid film disc 6, the fastening nut 16, the I-type valve stem O-type sealing ring 17 and the I-type valve stem 18. 2 (such as -300Pa gauge pressure), P 2 =1.27*Mg / D, where D is the diameter of the air inlet at the lower end of the valve body of the tank breathing valve.

[0110] In the tank breathing valve of the present invention, preferably, the lower end of the valve body is circumferentially arranged as an arc structure. The arc of the arc structure can be 0.4-0.6 rad, and the most preferred is 0.53 rad. Through such a structural design, low pressure drop flow of gas at the air inlet can be achieved.

[0111] In the storage tank breathing valve described in the present invention, preferably, the left side of the bottom partition of the vacuum cavity 21 is set to an arc structure. The curvature of the arc structure can be 1-1.1rad, and the most preferred is 1.05rad. When the air inlet diameter of the storage tank breathing valve is D, the arc radius of the arc structure is preferably 0.5-0.75D, and the most preferred is 2D / 3. Through such a structural design, the gas in the inner common cavity 20 of the breathing valve can be uniformly entered into the pressure cavity 25, or the air in the vacuum cavity 21 can be uniformly entered into the inner common cavity 20, thereby reducing pressure loss.

[0112] In the tank breathing valve of the present invention, preferably, a vacuum fire-blocking disk 22 is provided on the side of the vacuum cavity 21, and a vacuum rain cover 23 is correspondingly configured for the vacuum fire-blocking disk 22. When the diameter of the air inlet of the tank breathing valve is D, the arc radius of the vacuum rain cover 23 can be 1.4-1.6D, preferably 1.5D; the arc can be 1-1.2rad, preferably 1.1rad. Through such a structural design, the gas pressure loss during breathing of the breathing valve can be reduced.

[0113] In the storage tank breathing valve of the present invention, in one embodiment, as Fig. 9 As shown, a pressure fire-blocking disk 27 is provided on the top of the pressure cavity 25, and a pressure rain cover 28 is correspondingly configured for the pressure fire-blocking disk 27. When the diameter of the air inlet of the tank breathing valve is D, the arc radius of the pressure rain cover 28 can be 3.4-3.6D, preferably 3.5D; the arc can be 0.7-0.8rad, preferably 0.75rad. Through such a structural design, the gas pressure loss during breathing of the breathing valve can be reduced.

[0114] In the storage tank breathing valve of the present invention, in another embodiment, as Fig.10 As shown, a pressure pipe flame arrester 30 and a pipe flange 31 are provided on the side of the pressure chamber 25 .

[0115] In some embodiments, the storage tank breathing valve includes a valve body, the upper part of the inner cavity of the valve body is defined by a pressure cavity 25 through a pressure end valve hole 1, the lower part of the inner cavity of the valve body is defined by a vacuum cavity 21 through a partition and a vacuum end valve hole 13, the lower end of the valve body is an air inlet, a first sealing structure is provided on the pressure end valve hole 1, and a second sealing structure is provided on the vacuum end valve hole 13, wherein the first sealing structure and the second sealing structure each include a valve seat 4, a valve disc 8, a sealing diaphragm 5 and a solid film circular plate 6, two annular grooves are formed on the lower surface of the valve disc 8, the sealing diaphragm 5 is provided on the lower surface of the valve disc 8, and covers the annular grooves, the solid film circular plate 6 is provided in the middle of the lower surface of the valve disc 8, and is used to press the sealing diaphragm 5, the valve seat 4 has two sealing cones, and the The top of the sealing cone faces upward, and the sealing cone on the valve seat 4 and the annular groove on the valve disc 8 are configured corresponding to each other; wherein the annular groove located on the inner ring is a level I annular groove 82, and the annular groove located on the outer ring is a level II annular groove 83, the sealing cone corresponding to the level I annular groove 82 is a low-peak sealing cone 41, and the sealing cone corresponding to the level II annular groove 83 is a high-peak sealing cone 42, and the height of the high-peak sealing cone 42 is greater than the height of the low-peak sealing cone 41; a non-Newtonian fluid buffer ring 9 is arranged in the level II annular groove 83; the sealing diaphragm 5 is annular, and the sealing diaphragm 5 includes a polymer layer 51 and a fluororubber layer 52, and the material of the polymer layer 51 is preferably polytetrafluoroethylene; a plurality of rotors 81 are formed along the periphery of the lower surface of the valve disc 8;

[0116] In the first sealing structure installed on the pressure-end valve hole 1, the valve seat 4 is installed on the pressure-end valve hole 1, an O-ring 3 is arranged between the upper end of the pressure-end valve hole 1 and the valve seat 4, and the valve seat 4 is fixed to the pressure-end valve hole by a plurality of fasteners; a first telescopic valve stem structure is arranged on the valve disc 8, the upper end of the first telescopic valve stem structure is fixed to the top of the breathing valve body, and the lower end is connected to the upper surface of the valve disc 8; the first telescopic valve stem structure includes a valve stem 10, a rod sleeve 11 and a valve stem positioning sleeve 12, the rod sleeve 11 is arranged on the outside of the valve stem 10, and a plurality of rows of first ceramic balls 121 are arranged inside the valve stem positioning sleeve 12, and the valve stem 10 equipped with the valve sleeve can move up and down along the ceramic balls in the valve stem positioning sleeve 12;

[0117] In the second sealing structure installed on the vacuum end valve hole 13, the valve seat 4 is installed on the vacuum end valve hole 13, an O-ring 3 is arranged between the upper end of the vacuum end valve hole 13 and the valve seat 4, and the valve seat 4 is fixed to the vacuum end valve hole 13 by a plurality of fasteners; a second telescopic valve stem structure is arranged below the valve disc 8, the second telescopic valve stem structure includes an I-type valve stem 18 and a cross positioning ring 15, the I-type valve stem 18 passes through the cross positioning ring 15, and the upper end of the I-type valve stem 18 is fixed to the valve disc 8, the cross positioning ring 15 is fixed to the vacuum end valve hole 13 by a cross disc 151 (specifically, the cross disc 151, the valve seat 4 and the vacuum end valve hole 13 are fixed together by fasteners), and a plurality of rows of second ceramic balls 152 are arranged inside the cross positioning ring 15, and the I-type valve stem 18 can move up and down along the ceramic balls in the cross positioning ring 15;

[0118] The circumference of the lower end of the valve body is set to a circular arc structure, and the left side of the bottom partition of the vacuum chamber 21 is set to a circular arc structure;

[0119] A vacuum fire-blocking disk 22 is disposed on the side of the vacuum cavity 21 , and a vacuum rain cover 23 is configured correspondingly to the vacuum fire-blocking disk 22 ; a pressure fire-blocking disk 27 is disposed on the top of the pressure cavity 25 , and a pressure rain cover 28 is configured correspondingly to the pressure fire-blocking disk 27 .

[0120] In other embodiments, the storage tank breathing valve includes a valve body, the upper part of the inner cavity of the valve body is defined by a pressure cavity 25 through a pressure end valve hole 1, the lower part of the inner cavity of the valve body is defined by a vacuum cavity 21 through a partition and a vacuum end valve hole 13, the lower end of the valve body is an air inlet, a first sealing structure is provided on the pressure end valve hole 1, and a second sealing structure is provided on the vacuum end valve hole 13, wherein the first sealing structure and the second sealing structure each include a valve seat 4, a valve disc 8, a sealing diaphragm 5 and a solid film circular plate 6, two annular grooves are formed on the lower surface of the valve disc 8, the sealing diaphragm 5 is provided on the lower surface of the valve disc 8 and covers the annular grooves, the solid film circular plate 6 is provided in the middle of the lower surface of the valve disc 8 for pressing the sealing diaphragm 5, the valve seat 4 has two sealing cones, The top of the sealing cone faces upward, and the sealing cone on the valve seat 4 and the annular groove on the valve disc 8 are configured corresponding to each other; wherein the annular groove located on the inner ring is a level I annular groove 82, and the annular groove located on the outer ring is a level II annular groove 83, the sealing cone corresponding to the level I annular groove 82 is a low-peak sealing cone 41, and the sealing cone corresponding to the level II annular groove 83 is a high-peak sealing cone 42, and the height of the high-peak sealing cone 42 is greater than the height of the low-peak sealing cone 41; a non-Newtonian fluid buffer ring 9 is arranged in the level II annular groove 83; the sealing diaphragm 5 is annular, and the sealing diaphragm 5 includes a polymer layer 51 and a fluororubber layer 52, and the material of the polymer layer 51 is preferably polytetrafluoroethylene; a plurality of rotors 81 are formed along the outer periphery of the lower surface of the valve disc 8;

[0121] In the first sealing structure installed on the pressure-end valve hole 1, the valve seat 4 is installed on the pressure-end valve hole 1, an O-ring 3 is arranged between the upper end of the pressure-end valve hole 1 and the valve seat 4, and the valve seat 4 is fixed to the pressure-end valve hole by a plurality of fasteners; a first telescopic valve stem structure is arranged on the valve disc 8, the upper end of the first telescopic valve stem structure is fixed to the top of the valve body of the breathing valve, and the lower end is connected to the upper surface of the valve disc 8; the first telescopic valve stem structure includes a valve stem 10, a rod sleeve 11 and a valve stem positioning sleeve 12, the rod sleeve 11 is arranged on the outside of the valve stem 10, and a plurality of rows of first ceramic balls 121 are arranged inside the valve stem positioning sleeve 12, and the valve stem 10 equipped with the valve sleeve can move up and down along the ceramic balls in the valve stem positioning sleeve 12;

[0122] In the second sealing structure installed on the vacuum end valve hole 13, the valve seat 4 is installed on the vacuum end valve hole 13, an O-ring 3 is arranged between the upper end of the vacuum end valve hole 13 and the valve seat 4, and the valve seat 4 is fixed to the vacuum end valve hole 13 by a plurality of fasteners; a second telescopic valve stem structure is arranged below the valve disc 8, the second telescopic valve stem structure includes an I-type valve stem 18 and a cross positioning ring 15, the I-type valve stem 18 passes through the cross positioning ring 15, and the upper end of the I-type valve stem 18 is fixed to the valve disc 8, the cross positioning ring 15 is fixed to the vacuum end valve hole 13 by a cross disc 151 (specifically, the cross disc 151, the valve seat 4 and the vacuum end valve hole 13 are fixed together by fasteners), and a plurality of rows of second ceramic balls 152 are arranged inside the cross positioning ring 15, and the I-type valve stem 18 can move up and down along the ceramic balls in the cross positioning ring 15;

[0123] The circumference of the lower end of the valve body is set to a circular arc structure, and the left side of the bottom partition of the vacuum chamber 21 is set to a circular arc structure;

[0124] A vacuum fire-blocking disk 22 is disposed on the side of the vacuum cavity 21 , and a vacuum rain cover 23 is correspondingly configured on the vacuum fire-blocking disk 22 ; a pressure pipe flame arrester 30 and a pipe flange 31 are disposed on the side of the pressure cavity 25 .

[0125] In the tank breathing valve of the above embodiment, under the action of the low-peak sealing cone 41, the sealing diaphragm 5 is sunk into the level I annular groove 82 by 0.2mm-0.5mm; under the action of the high-peak sealing cone 42, the sealing diaphragm 5 is sunk into the level II annular groove 83 by 0.6mm-0.9mm. Such a design forms a double high-efficiency seal, which effectively reduces 95% of the breathing valve leakage under the joint action of the low-peak sealing cone 41 and the sealing diaphragm 5 sunk into the level I annular groove 82, and effectively reduces 99.9999% of the breathing valve leakage under the joint action of the high-peak sealing cone 42 and the sealing diaphragm 5 sunk into the level II annular groove 83. At the same time, a non-Newtonian fluid buffer ring 9 is arranged in the level II annular groove 83. The material is polyurethane elastomer, which can slowly contain the high-peak sealing cone 42 when the valve disc is in a static state, so as to realize the complete sealing of the rotor valve disc and the valve seat 4 and achieve zero leakage.

[0126] The following examples further illustrate the storage tank breathing valve of the present invention. The examples are implemented based on the technical solution of the present invention, and provide detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to the following examples.

[0127] Example 1

[0128] like Figure 1-9As shown, the storage tank breathing valve includes a valve body, the upper part of the inner cavity of the valve body is defined by a pressure cavity 25 through a pressure end valve hole 1, the lower part of the inner cavity of the valve body is defined by a vacuum cavity 21 through a partition and a vacuum end valve hole 13, the lower end of the valve body is an air inlet (the diameter of the air inlet is D), the pressure end valve hole 1 is provided with a first sealing structure, and the vacuum end valve hole 13 is provided with a second sealing structure; the circumference of the lower end of the valve body is set as an arc structure with an arc of 0.53 rad; the left side of the bottom partition of the vacuum cavity 21 is set as an arc structure with an arc of 1.05 rad and an arc radius of 2D / 3; a vacuum fire retardant disk 22 is provided on the side of the vacuum cavity 21, and a vacuum rain cover 23 is correspondingly configured for the vacuum fire retardant disk 22; a pressure fire retardant disk 27 is provided on the top of the pressure cavity 25, and a pressure rain cover 28 is correspondingly configured for the pressure fire retardant disk 27.

[0129] The first sealing structure and the second sealing structure each include a valve seat 4, a valve disc 8, a sealing diaphragm 5 and a solid film circular plate 6. Two annular grooves are formed on the lower surface of the valve disc 8. The sealing diaphragm 5 is arranged on the lower surface of the valve disc 8 and covers the annular grooves. The solid film circular plate 6 is arranged in the middle of the lower surface of the valve disc 8 to press the sealing diaphragm 5. The valve seat 4 has two sealing cones. The tops of the sealing cones face upwards. The sealing cones on the valve seat 4 and the annular grooves on the valve disc 8 are arranged correspondingly to each other. The annular groove on the inner ring is the Class I annular groove 82, and the annular groove on the outer ring is the Class II annular groove 83. A non-Newtonian fluid buffer ring 9 is arranged in the Class II annular groove 83, and the material is polyurethane elastomer; the waistline of the Class I annular groove 82 and the Class II annular groove 83 is S-shaped, and the upper and lower arcs of the waistline of the Class I annular groove 82 and the Class II annular groove 83 are 1.15 rad; the relationship between the center ring diameter D1 of the Class I annular groove 82 and the center ring diameter D2 of the Class II annular groove 83 is: D2=D1+b, which b is 20 mm, D1=D, the width of the I-level annular groove 82 is 6 mm, and the depth is 2.8 mm; the width of the II-level annular groove 83 is 10 mm, and the depth is 2.8 mm; the sealing cone corresponding to the I-level annular groove 82 is a low-peak sealing cone 41, and the sealing cone corresponding to the II-level annular groove 83 is a high-peak sealing cone 42, the height of the high-peak sealing cone 42 is greater than the height of the low-peak sealing cone 41, and the relationship between the height h1 of the low-peak sealing cone 41 and the height h2 of the high-peak sealing cone 42 is h2=h1+a, where a is 0.4 mm, the height of the valve seat 4 is 35 mm, the inner angle of the low peak sealing cone 41 and the high peak sealing cone 42 is 60°, and the low peak sealing cone 41 and the high peak sealing cone 42 are arc-processed so that the arc diameter of the cone is 0.2 mm; the sealing diaphragm 5 is formed by vulcanization and gluing of a polytetrafluoroethylene diaphragm and a fluororubber diaphragm, the sealing diaphragm 5 is annular, has a thickness of 0.9 mm, a hardness of HR60, and a thickness ratio of the polytetrafluoroethylene diaphragm to the fluororubber diaphragm is 1:2;

[0130] Seventeen rotors 81 are vertically formed along the outer circumference of the lower surface of the valve disc 8. A circular ring structure is provided at the bottom of the rotors to connect the rotors together. The width of the circular ring structure is 8 mm. Adjacent rotors are arranged staggered with each other. The gap c between two adjacent rotors is 5 mm. The curvature k of the rotor 81 is 0.36 rad. The valve disc 8, the rotor 81 and the circular ring structure are stainless steel integrally formed structures. The outer diameter D of the valve disc 8 is 1.3 mm. 3 =D+50mm, rotor radius R 4=0.2D, the height of the rotor is 0.628*(0.1*D+12)mm;

[0131] In the first sealing structure installed on the pressure end valve hole 1, the valve seat 4 is installed on the pressure end valve hole 1, an O-ring 3 is arranged between the upper end of the pressure end valve hole 1 and the valve seat 4, and the valve seat 4 is fixed to the pressure end valve hole by 4 fastening screws; a first telescopic valve stem structure is arranged on the valve disc 8, the upper end of the first telescopic valve stem structure is fixed to the top of the breathing valve body, and the lower end is connected to the upper surface of the valve disc 8; the first telescopic valve stem structure includes a valve stem 10, a rod sleeve 11 and a valve stem positioning sleeve 12, the rod sleeve 11 is arranged on the outside of the valve stem 10, and 4 rows of first ceramic balls 121 are arranged inside the valve stem positioning sleeve 12 (15 ceramic balls are distributed longitudinally in each row, the particle size of the ceramic balls is 3mm, and the distance between the rod sleeve 11 and the surrounding ceramic balls is 0.1mm), and the valve stem 10 equipped with the valve sleeve can move up and down along the ceramic balls in the valve stem positioning sleeve 12;

[0132] In the second sealing structure installed on the vacuum end valve hole 13, the valve seat 4 is installed on the vacuum end valve hole 13, an O-ring 3 is arranged between the upper end of the vacuum end valve hole 13 and the valve seat 4, and the valve seat 4 is fixed to the vacuum end valve hole 13 by 4 fastening screws; a second telescopic valve stem structure is arranged under the valve disc 8, and the second telescopic valve stem structure includes an I-type valve stem 18 and a cross positioning ring 15, the I-type valve stem 18 passes through the cross positioning ring 15, and the upper end of the I-type valve stem 18 is fixed to the valve On the disk 8, the cross positioning ring 15 is fixed on the vacuum end valve hole 13 through the cross disk 151 (specifically, the cross disk 151, the valve seat 4 and the vacuum end valve hole 13 are fixed together by fastening screws), and 4 rows of second ceramic balls 152 are arranged inside the cross positioning ring 15 (15 ceramic balls are distributed longitudinally in each row, the particle size of the ceramic balls is 3 mm, and the distance between the rod sleeve 11 and the surrounding ceramic balls is 0.1 mm), and the I-type valve stem 18 can move up and down along the ceramic balls in the cross positioning ring 15.

[0133] Example 2

[0134] The storage tank breathing valve described in Example 1 is used, wherein the air inlet diameter D of the breathing valve is 300 mm, which is called breathing valve A1.

[0135] The breathing valve A1 was tested using the VENTIL CT800-T4 breathing valve test device, with the pressure end opening pressure being 1350 Pa and the vacuum end opening pressure being -300 Pa. The test standard was based on API 2000-2014 "Venting Atmospheric and Low-pressure Storage Takns" and ISO 28300-2008 "Petroleum, petrochemical and natural gas industries-Venting of atmospheric and low-pressure storage tanks".

[0136] As a result, under the test pressure of 1012Pa (1350Pa*75%), the leakage rate of breathing valve A1 was 0Nml / min, and when the leakage rate of breathing valve A1 was 1Nml / min, the test pressure was 1300Pa, reaching 96% of the opening pressure; under the test pressure of -225Pa (-300Pa*75%), the leakage rate of breathing valve A1 was 0Nml / min, and when the leakage rate of breathing valve A1 was 1Nml / min, the test pressure was -290Pa, reaching 96% of the opening pressure.

[0137] Example 3

[0138] The storage tank breathing valve described in Example 1 is used, wherein the air inlet diameter D of the breathing valve is 150 mm, which is called breathing valve A2.

[0139] The breathing valve A1 was tested using the VENTIL CT800-T4 breathing valve test device, with the pressure end opening pressure being 1750 Pa and the vacuum end opening pressure being -300 Pa. The test standard was based on API 2000-2014 "Venting Atmospheric and Low-pressure Storage Takns" and ISO 28300-2008 "Petroleum, petrochemical and natural gas industries-Venting of atmospheric and low-pressure storage tanks".

[0140] As a result, under the test pressure of 1310Pa (1750Pa*75%), the leakage rate of breathing valve A2 was 0Nml / min, and when the leakage rate of breathing valve A2 was 1Nml / min, the test pressure was 1700Pa, reaching 97% of the opening pressure; under the test pressure of -225Pa (-300Pa*75%), the leakage rate of breathing valve A2 was 0Nml / min, and when the leakage rate of breathing valve A2 was 1Nml / min, the test pressure was -290Pa, reaching 96% of the opening pressure.

[0141] Example 4

[0142] The storage tank breathing valve described in Example 1 is used, wherein the air inlet diameter D of the breathing valve is 200 mm, which is called breathing valve A3.

[0143] The breathing valve A1 was tested using the VENTIL CT800-T4 breathing valve test device, with the pressure end opening pressure being 1350 Pa and the vacuum end opening pressure being -300 Pa. The test standard was based on API 2000-2014 "Venting Atmospheric and Low-pressure Storage Takns" and ISO 28300-2008 "Petroleum, petrochemical and natural gas industries-Venting of atmospheric and low-pressure storage tanks".

[0144] As a result, under the test pressure of 1012Pa (1350Pa*75%), the initial leakage rate of breathing valve A3 was 0Nml / min, and the leakage rate of breathing valve A3 was 1Nml / min at 1300Pa (1350Pa*96%). After being left to stand for 365 consecutive days and testing the leakage rate every 10 days, the average leakage rate was 1.2Nml / min. When the sealing diaphragm was disassembled, it was found that the deformation of the sealing diaphragm was 0.8%, but it still maintained a good elastic state.

[0145] The breathing valve A3 was subjected to repeated jump tests at an opening pressure of 1350Pa. At a test pressure of 1012Pa (1350Pa*75%), the initial leakage rate of the breathing valve A3 was 0Nml / min, and the leakage rate was 1Nml / min at 1300Pa (1350Pa*96%). The test was carried out for 110,000 times. The leakage rate was 0Nml / min at the test pressure of 1012Pa, and the leakage rate was 39Nml / min at 1300Pa. After standing for 20 minutes, the leakage rate at 1300Pa was 1Nml / min. It can be seen that the composite sealing diaphragm has a strong self-recovery function.

[0146] Example 5

[0147] This embodiment uses the breathing valve A3 to conduct experiments.

[0148] The LDAR test of the breathing valve installed on the tank was carried out using the phx42-7314 total hydrocarbon analyzer from the German LDARtools company. The test method was carried out in accordance with HJ1230-2021 "Detection and Repair of Volatile Organic Compound Leaks in Industrial Enterprises". The breathing valve A3 was installed on the top of a 5000 cubic benzene tank. When the pressure of the benzene tank was 1020Pa, the VOCs concentration at the outlet of the breathing valve A3 device was measured to be 0ppm. When the pressure of the benzene tank was 1300Pa, the VOCs concentration at the outlet of the breathing valve A3 device was measured to be 0.3ppm. It can be seen that the sealing effect of the breathing valve is good and the leakage rate is small.

[0149] After using the breather valve A3 for one year, the valve stem of the breather valve A3 was disassembled and inspected during the annual inspection. The initial surface roughness of the valve stem was 8μm. After one year, the surface of the valve stem of the breather valve A3 was smooth and uniform, with a maximum roughness of 8.5μm. It can be seen that the rotor valve disc is well centered when opened, solving the problem of unstable airflow caused by the eccentric state of the ordinary valve disc.

[0150] Moreover, the composite sealing diaphragm used in the breathing valve A3 has no creases on its surface, and the composite sealing diaphragm deforms by 0.5% and still maintains a good elastic state.

[0151] It can be seen from the above embodiments that the storage tank breathing valve according to the present invention can achieve complete sealing and achieve a zero-leakage sealing effect of the breathing valve.

[0152] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A tank breathing valve, comprising a valve body, wherein the upper part of the inner cavity of the valve body is defined by a pressure cavity (25) through a pressure end valve hole (1), and the lower part of the inner cavity of the valve body is defined by a vacuum cavity (21) through a partition and a vacuum end valve hole (13), the lower end of the valve body is an air inlet, a first sealing structure is provided on the pressure end valve hole (1), and a second sealing structure is provided on the vacuum end valve hole (13), wherein: The first sealing structure and the second sealing structure each comprise a valve seat (4), a valve disc (8), a sealing diaphragm (5) and a solid film circular plate (6); the lower surface of the valve disc (8) is formed with more than two annular grooves; the sealing diaphragm (5) is arranged on the lower surface of the valve disc (8) and covers the annular grooves; the solid film circular plate (6) is arranged in the middle of the lower surface of the valve disc (8) and is used to press the sealing diaphragm (5); the valve seat (4) has more than two sealing cones, the tops of the sealing cones face upward, and the sealing cones on the valve seat (4) and the annular grooves on the valve disc (8) are arranged corresponding to each other.

2. The tank breathing valve according to claim 1, characterized in that: The number of the annular grooves on the sealing cone on the valve seat (4) and the valve disc (8) are both two, the annular groove located on the inner ring is a level I annular groove (82), and the annular groove located on the outer ring is a level II annular groove (83).

3. The tank breathing valve according to claim 2, characterized in that: The sealing cone corresponding to the I-level annular groove (82) is a low-peak sealing cone (41), and the sealing cone corresponding to the II-level annular groove (83) is a high-peak sealing cone (42), and the height of the high-peak sealing cone (42) is greater than the height of the low-peak sealing cone (41); Preferably, the ring diameter of the low peak sealing cone (41) in the first sealing structure and the second sealing structure is equal to the diameter of the air inlet at the lower end of the valve body.

4. The tank breathing valve according to claim 3, characterized in that: The relationship between the height h1 of the low peak sealing cone (41) and the height h2 of the high peak sealing cone (42) is: h2=h1+a, wherein a is 0.1-0.8 mm.

5. The tank breathing valve according to claim 3 or 4, characterized in that: The inner angles of the low-peak sealing cone (41) and the high-peak sealing cone (42) are 45-75°, and the cones are processed into arcs with an arc diameter of 0.1-0.3 mm.

6. The tank breathing valve according to any one of claims 2 to 5, characterized in that: A non-Newtonian fluid buffer ring (9) is arranged in the II-level annular groove (83); Preferably, the material of the non-Newtonian fluid buffer ring (9) is polyurethane elastomer.

7. The tank breathing valve according to any one of claims 2 to 6, characterized in that: The waistlines of the level I annular groove (82) and the level II annular groove (83) are S-shaped; Preferably, the upper and lower curvatures of the waistlines of the level I annular groove (82) and the level II annular groove (83) are 1.1-1.2 rad.

8. The tank breathing valve according to any one of claims 2 to 6, characterized in that: The relationship between the center ring diameter D1 of the level I annular groove (82) and the center ring diameter D2 of the level II annular groove (83) is: D2=D1+b, wherein b is 14-30 mm.

9. The tank breathing valve according to any one of claims 2 to 6, characterized in that: The width of the level I annular groove (82) is 5-8 mm, the width of the level II annular groove (83) is 8-12 mm, and the depths of the level I annular groove (82) and the level II annular groove (83) are 2.5-3.2 mm.

10. The tank breathing valve according to any one of claims 1 to 9, characterized in that: The sealing diaphragm (5) comprises a polymer layer (51) and a fluororubber layer (52); Preferably, the material of the polymer layer (51) is polytetrafluoroethylene; Preferably, the thickness of the sealing membrane (5) is 0.5-1.1 mm; Preferably, the hardness of the sealing membrane (5) is HR50-HR75.

11. The tank breathing valve according to any one of claims 1 to 10, characterized in that: The sealing diaphragm (5) is in the shape of a circular ring.

12. The tank breathing valve according to claim 1, characterized in that: A plurality of rotor blades (81) are formed along the outer periphery of the lower surface of the valve disc (8).

13. The tank breathing valve according to claim 12, characterized in that: Adjacent rotors are arranged staggered with each other.

14. The tank breathing valve according to claim 12 or 13, characterized in that: The radian of each rotor is 0.3rad to 0.4rad.

15. The tank breathing valve according to claim 12 or 13, characterized in that: The gap between two adjacent rotors is 3-6mm.

16. The tank breathing valve according to claim 12 or 13, characterized in that: The number of the rotors (81) is 15-20.

17. The tank breathing valve according to any one of claims 1 to 16, characterized in that: In the first sealing structure, a first telescopic valve stem structure is arranged on the top of the valve disc (8), the upper end of the first telescopic valve stem structure is fixed to the top of the pressure chamber (25), and the lower end is connected to the upper surface of the valve disc (8).

18. The tank breathing valve according to claim 17, characterized in that: The first telescopic valve stem structure comprises a valve stem (10), a rod sleeve (11) and a valve stem positioning sleeve (12); the rod sleeve (11) is arranged outside the valve stem (10); a plurality of rows of first ceramic balls (121) are arranged inside the valve stem positioning sleeve (12); the valve stem (10) equipped with the valve sleeve can move up and down along the ceramic balls in the valve stem positioning sleeve (12).

19. The tank breathing valve according to claim 18, characterized in that: The central axes of the valve stem positioning sleeve (12), the valve disc (8) of the first sealing structure and the pressure end valve hole (1) overlap; Preferably, the top of the valve stem positioning sleeve (12) is fixed by a fixing cross ring (26).

20. The tank breathing valve according to any one of claims 1 to 16, characterized in that: In the second sealing structure, a second telescopic valve stem structure is arranged below the valve disc (8), and the second telescopic valve stem structure includes an I-type valve stem (18) and a cross positioning ring (15), the I-type valve stem (18) passes through the cross positioning ring (15), and the upper end of the I-type valve stem (18) is fixed on the valve disc (8), the cross positioning ring (15) is fixed on the vacuum end valve hole (13) through a cross disc (151), and a plurality of rows of second ceramic balls (152) are arranged inside the cross positioning ring (15), and the I-type valve stem (18) can move up and down along the ceramic balls in the cross positioning ring (15).

21. The tank breathing valve according to claim 20, characterized in that: The central axes of the cross positioning ring (15), the valve disc (8) of the second sealing structure and the vacuum end valve hole (13) overlap.

22. The tank breathing valve according to any one of claims 1 to 21, characterized in that: The circumference of the lower end of the valve body is arranged as an arc structure.

23. The tank breathing valve according to any one of claims 1 to 21, characterized in that: The left side of the bottom partition of the vacuum chamber (21) is arranged in an arc structure.

24. The tank breathing valve according to any one of claims 1 to 23, characterized in that: A vacuum fire-blocking disk (22) is provided on the side of the vacuum cavity (21), and a vacuum rainproof cover (23) is correspondingly configured for the vacuum fire-blocking disk (22).

25. The tank breathing valve according to any one of claims 1 to 24, characterized in that: A pressure fire-retardant disk (27) is arranged on the top of the pressure cavity (25), and a pressure rain cover (28) is correspondingly arranged on the pressure fire-retardant disk (27).

26. The tank breathing valve according to any one of claims 1 to 24, characterized in that: A pressure pipe flame arrester (30) and a pipe flange (31) are provided on the side of the pressure chamber (25).

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