Seal structure, storage tank breathing valve, and storage tank

Abstract

The present application relates to the technical field of storage tanks and discloses a seal structure, a breathing valve for a storage tank, and a storage tank. The seal structure includes a valve seat and a valve disc that are arranged opposite each other and tightly seal against each other, wherein the tightly sealing surface of one of the valve disc and the valve seat is provided with an inner ring groove and an outer ring groove surrounding the inner ring groove, and the tightly sealing side of the other is formed with an inner ring seal protrusion aligned with the inner ring groove and an outer ring seal protrusion aligned with the outer ring groove, and a flexible seal diaphragm covered by the inner ring groove and the outer ring groove, wherein, when the valve seat and the valve disc are in a tightly sealed state, at least a portion of the inner ring seal protrusion extends into the inner ring groove, and the outer ring seal protrusion extends at least a portion of the outer ring groove, and the flexible seal diaphragm is pressed by the protruding ends of the inner ring seal protrusion and the outer ring seal protrusion, and elastically extends toward the inside of the inner ring groove and the outer ring groove. The sealing structure can improve the breathing valve of the storage tank, the sealing property and safety of the storage tank.

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims the benefit of Chinese Patent Application No. 202310372469.7 filed on April 10, 2023, Chinese Patent Application No. 202311168691.1 filed on September 11, 2023, Chinese Patent Application No. 202311168701.1 filed on September 11, 2023, and Chinese Patent Application No. 202322458198.5 filed on September 11, 2023, the contents of which are incorporated herein by reference.

[0002] The present application relates to the technical field of storage tanks, and more particularly to a seal structure, a breathing valve for a storage tank, and a storage tank. [Background technology]

[0003] Breathing valves, a safety accessory for storage tanks, reduce evaporation loss of volatile liquids in normal and low-pressure storage tanks. Breathing valves not only maintain air pressure balance within the tank and prevent damage to the tank from overpressure or underpressure, but also utilize the tank's own pressure load capacity to reduce evaporation and loss of the medium within the tank, playing an important role in both safety and environmental protection.

[0004] Under normal operating conditions, when a storage tank discharges material to the outside, the breathing valve of the storage tank begins to draw air into the tank. When a storage tank is filled with material, the breathing valve of the storage tank begins to discharge the gas inside the tank to the outside. If the vapor pressure of the material inside the tank increases or decreases due to factors such as climate change, the breathing valve of the storage tank will discharge vapor or inhale air or nitrogen. The sealing structure design of existing storage tank breathing valves is relatively weak (e.g., only a single-layer seal), which makes the sealing structure unstable and leads to leakage problems after long-term use. Abnormal operation of a storage tank breathing valve creates serious safety hazards and environmental risks in the storage tank area, making it difficult to ensure the safety of people and property. Summary of the Invention [Problem to be solved by the invention]

[0005] The object of the present application is to provide a sealing structure, a breathing valve for a storage tank, and a storage tank that have a simple structure, and have the advantages of effectively improving the sealing performance, safety, and environmental friendliness of the storage tank, and ensuring the safety of individuals and property. [Means for solving the problem]

[0006] In order to achieve the above object, a first aspect of the present application provides a seal structure, the seal structure comprising: a valve seat and a valve disc that are disposed opposite each other and tightly seal against each other, wherein the tight seal surface of one of the valve disc and the valve seat is provided with an inner ring groove and an outer ring groove surrounding the outside of the inner ring groove, and the tight seal surface of the other is formed with an inner ring seal protrusion aligned with the inner ring groove and an outer ring seal protrusion aligned with the outer ring groove; a flexible seal diaphragm provided on the sealing surface and covering the inner ring groove and the outer ring groove; When the valve seat and valve disc are tightly sealed, the inner ring seal projection extends at least partially into the inner ring groove, the outer ring seal projection extends at least partially into the outer ring groove, and the flexible seal diaphragm, pressed by the respective protruding ends of the inner ring seal projection and the outer ring seal projection, elastically extends toward the inside of the inner ring groove and the outer ring groove.

[0007] In the embodiment of the present application, there is one inner ring groove, one outer ring groove, one inner ring seal projection, and one outer ring seal projection, or a plurality of such grooves are distributed concentrically.

[0008] In the embodiment of the present application, the inner ring groove and the outer ring groove are recessed into the sealing surface of the valve disc, the flexible sealing diaphragm is covered by the sealing surface of the valve disc, and the inner ring seal protrusion and the outer ring seal protrusion are both formed on the sealing side of the valve seat; Optionally, the flexible sealing diaphragm is pressed against the tight sealing surface of the valve disc by a diaphragm retainer disc.

[0009] In the embodiment of the present application, the protruding ends of the inner ring seal projection and the outer ring seal projection all constitute tapered ends that press against the flexible seal diaphragm, and the tapered ends have tip contact surfaces that contact the flexible seal diaphragm formed as arcuate surfaces; Optionally, the range of the included angle of the tapered end is between 45° and 75°; Optionally, the arc diameter of the arc surface is in the range of 0.1 mm to 0.3 mm.

[0010] In the embodiment of the present application, the projection height of the outer ring seal projection is greater than the projection height of the inner ring seal projection, Optionally, the difference between the protrusion height of the outer ring seal protrusion and the protrusion height of the inner ring seal protrusion ranges from 0.1 mm to 0.8 mm.

[0011] In the present embodiment, the corner joints between the side wall of the inner ring groove, the side wall of the outer ring groove, and the sealing surface of the valve disc all transition in a smooth arc; Optionally, the radian range of the transition arc formed is 1.1 rad to 1.2 rad.

[0012] In the present embodiment, the seal structure comprises: The outer ring groove further includes a buffer ring disposed in the recessed groove of the outer ring groove, and the protruding end of the outer ring seal protrusion presses the flexible seal diaphragm toward the buffer ring; Optionally, the material of the buffer ring is a polyurethane elastomer.

[0013] In an embodiment of the present application, the flexible sealing diaphragm includes a polymer sheet layer and a fluoroelastomer composite layer laminated together, Optionally, the fluororubber composite layer is made of a raw material composition containing a fluororubber, an inorganic filler, an acid absorber, a vulcanizing agent, a release agent, and a colorant; Optionally, the polymer sheet forming the polymer sheet layer is one or more selected from polyetheretherketone, polytetrafluoroethylene, and polyimide; Optionally, the polymer sheet layer has a thickness of 0.1 mm to 1 mm; Optionally, the thickness ratio of the polymer sheet layer to the fluororubber composite layer is in the range of 0.25 to 1; Optionally, the flexible sealing diaphragm is toric.

[0014] In the present embodiment, the valve disc is a rotor valve disc that is self-rotatable by the drive of the overflow gas flow.

[0015] In the present embodiment, the rotor valve disc comprises: a disk body having both an inner ring groove and an outer ring groove formed on its disk surface; a rotor ring suspended downward from the periphery of the disk body and including a plurality of rotors spaced apart from one another in the circumferential direction, with gap-like gas flow channels formed between adjacent two rotors, and an overflow gas flow flowing from the inside to the outside through the gap-like gas flow channels drives the valve disk to rotate itself; Optionally, the rotor radian is between 0.3 rad and 0.4 rad; Optionally, the number of rotors is between 15 and 20; Optionally, the width of the interstitial gas flow channels ranges from 3mm to 6mm.

[0016] A second aspect of the present application is a breathing valve for a storage tank having a pressure end and a vacuum end provided therein, The breathing valve of the storage tank includes the above-mentioned sealing structure, and the sealing structure provides a breathing valve of the storage tank that is provided at the pressure end and / or the vacuum end.

[0017] In an embodiment of the present application, the seal structure includes a pressure end seal structure provided at the pressure end and a vacuum end seal structure provided at the vacuum end, and a valve stem is connected to a valve disc of the seal structure, with the valve stem connected to the pressure end seal structure extending from the disc surface of the valve disc in a direction away from the valve seat, and the valve stem connected to the vacuum end seal structure extending from the disc surface of the valve disc in a direction on the same side as the valve seat.

[0018] In the embodiment of the present application, at the pressure end, a pressure end mounting seat extending radially inward is formed on the inner wall of the housing of the breathing valve of the storage tank, and a pressure end valve hole is formed around the pressure end mounting seat; at the vacuum end, a vacuum end mounting seat for mounting a vacuum end seal structure is provided inside the housing of the breathing valve of the storage tank, and a vacuum end valve hole is formed around the vacuum end mounting seat; an intake port is formed at the bottom of the housing of the breathing valve of the storage tank, and the central axes of the pressure end valve hole, the vacuum end valve hole, and the intake port overlap.

[0019] In the embodiment of the present application, at the pressure end, a valve stem positioning sleeve is fixedly provided within the breathing valve of the storage tank, fitted onto the valve stem of the pressure end seal structure, and a plurality of positioning balls are provided between the inner peripheral wall of the valve stem positioning sleeve and the outer peripheral side of the valve stem, and the plurality of positioning balls are arranged at intervals in the circumferential direction and stacked in the axial direction.

[0020] In the embodiment of the present application, a bushing is fitted onto the outside of the valve stem, and the outer peripheral wall of the bushing contacts the positioning ball.

[0021] In the embodiment of the present application, at the pressure end, a pressure end mounting seat extending radially inward is formed on the inner wall of the housing of the storage tank breathing valve, and the valve seat of the pressure end seal structure is seated on and firmly connected to the peripheral edge of the seat body of the pressure end mounting seat, and an annular seal ring is provided at the contact portion between the bottom of the valve seat and the peripheral edge of the seat body.

[0022] In the present embodiment, at the vacuum end, the breathing valve of the storage tank is a vacuum end mounting seat provided in a housing of a breathing valve of the storage tank, used for mounting a vacuum end seal structure, and having a vacuum end valve hole formed around it; a valve stem positioning sleeve inserted into a valve stem fixing disk, wherein a valve stem having a vacuum end seal structure passes through the valve stem positioning sleeve and is connected to the valve disk; a valve stem positioning sleeve inserted into the valve stem fixing disk, a portion of which extends into the vacuum end valve hole, the valve stem passing through the valve stem positioning sleeve and connected to the valve disk of the vacuum end seal structure; The valve stem further includes a plurality of positioning balls provided between the inner peripheral wall of the valve stem positioning sleeve and the outer peripheral side of the valve stem, spaced apart in the circumferential direction, and stacked in the axial direction.

[0023] In the embodiment of the present application, the valve seat of the vacuum end seal structure is seated on and firmly connected to the peripheral edge of the seat body of the vacuum end mounting seat, and an annular seal ring is provided at the contact portion between the bottom of the valve seat and the peripheral edge of the seat body.

[0024] In an embodiment of the present application, the breathing valve of the storage tank is a valve stem connected to a valve disc; a valve stem positioning sleeve fixedly fitted onto the outside of the valve stem; The valve stem further includes a plurality of positioning balls provided between the inner peripheral wall of the valve stem positioning sleeve and the outer peripheral side of the valve stem, spaced apart in the circumferential direction, and stacked in the axial direction.

[0025] In the embodiment of the present application, the housing of the breathing valve for the storage tank has a straight cylindrical portion and a tapered portion whose diameter narrows inward from the bottom of the straight cylindrical portion, and the peripheral wall of the tapered portion is formed as a circular arc wall.

[0026] In an embodiment of the present application, a vacuum chamber located at the vacuum end is formed inside the housing of the storage tank breathing valve, and the storage tank breathing valve is located on one lateral side of the vacuum chamber and further includes a vacuum fireproof panel fitted into the side wall of the housing, and the side wall of the vacuum chamber facing away from the vacuum fireproof panel is an arc wall.

[0027] In an embodiment of the present application, the breathing valve of the storage tank further includes a vacuum rain cover that is disposed outside the vacuum fireproof panel and has an arcuate shape.

[0028] A third aspect of the present application provides a storage tank including the above-described storage tank breathing valve. [Effects of the Invention]

[0029] As can be seen from the above technical solution, the seal structure includes a valve seat, a valve disc, and a flexible seal diaphragm, the valve seat and the valve disc being disposed opposite each other and tightly sealing against each other, the sealing surface of one of the valve disc and the valve seat being provided with an inner ring groove and an outer ring groove surrounding the inner ring groove, and the sealing surface of the other being provided with an inner ring seal protrusion aligned with the inner ring groove and an outer ring seal protrusion aligned with the outer ring groove. The flexible seal diaphragm is disposed on the sealing surface and covers the inner ring groove and the outer ring groove. When the valve seat and the valve disc are tightly sealed together, the inner ring seal protrusion at least partially extends into the inner ring groove, and the outer ring seal protrusion at least partially extends into the outer ring groove. The flexible seal diaphragm is pressed by the protruding ends of the inner ring seal protrusion and the outer ring seal protrusion, elastically extending toward the inside of the inner ring groove and the outer ring groove, thereby achieving a double high-performance seal and significantly improving sealing performance. When the above-mentioned sealing structure is used in the breathing valve of a storage tank, it can effectively reduce the probability of leakage of the breathing valve of the storage tank, improve the safety and environmental friendliness of the breathing valve of the storage tank, and help to ensure the safety of individuals and the safety of property.

[0030] Other features and advantages of the embodiments of the present application are described in detail in the specific embodiments section below. [Brief explanation of the drawings]

[0031] The drawings are included to provide a further understanding of the invention, constitute a part of this specification, and together with the following specific embodiments are used to explain, but not to limit, the invention. [Figure 1] FIG. 2 is a partial structural schematic diagram of a sealing structure of a breathing valve pressure end of a storage tank in an embodiment of the present application. [Figure 2] FIG. 2 is a structural schematic diagram of a valve disc in an embodiment of the present application at a first viewing angle. [Figure 3] FIG. 2 is a structural schematic diagram of a valve disc in an embodiment of the present application at a second viewing angle. [Figure 4] FIG. 2 is a structural schematic diagram of a flexible seal diaphragm in an embodiment of the present application. [Figure 5] 1 is a structural schematic diagram of a sealing structure of a pressure end of a breathing valve of a storage tank in an embodiment of the present application. [Figure 6] 1 is a structural schematic diagram of the positioning mechanism of the pressure end of the breathing valve of the storage tank in an embodiment of the present application; [Figure 7] FIG. 2 is a structural schematic diagram of a sealing structure at the vacuum end of a breathing valve of a storage tank in an embodiment of the present application. [Figure 8] 1 is a structural schematic diagram of a positioning mechanism for the vacuum end of a breathing valve of a storage tank in an embodiment of the present application. FIG. [Figure 9] FIG. 2 is a structural schematic diagram of a breathing valve of an atmospheric pressure storage tank in an embodiment of the present application. [Figure 10] FIG. 2 is a structural schematic diagram of a breathing valve of a piped storage tank in an embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0032] Hereinafter, specific embodiments of the present application will be described in detail with reference to the drawings. It should be understood that the specific embodiments described in this specification are for the purpose of explaining and interpreting the present application, and are not intended to limit the present application.

[0033] This application discloses a new seal structure for a breathing valve of a storage tank. As shown in Figures 1, 5, and 7, in one specific embodiment, the seal structure comprises: a valve disc 8 and a valve seat 4 that are disposed opposite each other and tightly seal against each other, wherein an inner ring groove 82 and an outer ring groove 83 surrounding the inner ring groove 82 are formed on the tight seal surface of one of the valve disc 8 and the valve seat 4, and an inner ring seal protrusion 41 aligned with the inner ring groove 82 and an outer ring seal protrusion 42 aligned with the outer ring groove 83 are formed on the other tight seal side; a flexible seal diaphragm (5) provided on the tight seal surface and covering the inner ring groove (82) and the outer ring groove (83); When the valve seat 4 and valve disc 8 are tightly sealed, the inner ring seal projection 41 extends at least partially into the inner ring groove 82, and the outer ring seal projection 42 extends at least partially into the outer ring groove 83, and the flexible seal diaphragm 5, which is pressed by the respective protruding ends of the receiving inner ring seal projection 41 and the outer ring seal projection 42, elastically extends toward the inside of the inner ring groove 82 and the outer ring groove 83.

[0034] The present application aims to improve the sealing performance of a seal structure. Specifically, when both an inner ring groove 82 and an outer ring groove 83 are formed in a valve disc 8, both an inner ring seal protrusion 41 and an outer ring seal protrusion 42 are formed corresponding to a valve seat 4, and the openings of the inner ring groove 82 and the outer ring groove 83 face downward. A flexible seal diaphragm 5 is provided on the ceiling wall of the cavity in the valve disc 8 and covers both the openings of the inner ring groove 82 and the outer ring groove 83. When the valve disc 8 moves downward and approaches the valve seat 4, at least a portion of the inner ring seal protrusion 41 and the outer ring seal protrusion 42 of the valve seat 4 extend upward into the inner ring groove 82 and the outer ring groove 83, at which point the inner ring seal protrusion 41 and the outer ring seal protrusion 42 form a first seal structure and a second seal structure, respectively, with the flexible seal diaphragm 5. Alternatively, when both an inner ring groove 82 and an outer ring groove 83 are formed in the valve seat 4, both an inner ring seal protrusion 41 and an outer ring seal protrusion 42 are formed corresponding to the valve disc 8, with the openings of the inner ring groove 82 and the outer ring groove 83 facing upward. A flexible sealing diaphragm 5 is mounted on the top wall of the valve seat 4, covering both the openings of the inner ring groove 82 and the outer ring groove 83. When the valve disc 8 moves downward toward the valve seat 4, the inner ring seal protrusion 41 and the outer ring seal protrusion 42 of the valve disc 8 extend at least partially upward into the inner ring groove 82 and the outer ring groove 83, at which point the inner ring seal protrusion 41 and the outer ring seal protrusion 42 form a first seal structure and a second seal structure with the flexible sealing diaphragm 5, respectively. In this embodiment, the first seal structure and the second seal structure cooperate to achieve a double high-performance seal, greatly improving sealing performance. When the above-mentioned sealing structure is used in the breathing valve of a storage tank, it can effectively reduce the probability of leakage of the breathing valve of the storage tank, improve the safety and environmental friendliness of the breathing valve of the storage tank, and help to ensure the safety of individuals and the safety of property.

[0035] In one embodiment of the present application, there is one each of the inner ring groove 82, the outer ring groove 83, the inner ring seal projection 41, and the outer ring seal projection 42, or a plurality of them are distributed concentrically.

[0036] Specifically, the number of inner ring grooves 82 and outer ring grooves 83 in this embodiment is not limited to one, i.e., it is not limited to a double seal structure, but may be two, three, four or any other number, and therefore the number of inner ring seal protrusions 41 and outer ring seal protrusions 42 may also be two, three, four or any other number.

[0037] In one embodiment of the present application, the inner ring groove 82 and the outer ring groove 83 are provided within the tight seal surface of the valve disc 8, the flexible seal diaphragm 5 is covered by the tight seal surface of the valve disc 8, and the inner ring seal protrusion 41 and the outer ring seal protrusion 42 are both formed on the tight seal side of the valve seat 4.

[0038] Optionally, the flexible sealing diaphragm 5 is pressed against the tight sealing surface of the valve disc 8 by a diaphragm fixed disc 6 .

[0039] Specifically, the seal structure in this embodiment further includes a diaphragm fixing disk 6 and a valve disk fastening screw 7, the diaphragm fixing disk 6 is disposed below the flexible seal diaphragm 5 and radially covers a portion of the flexible seal diaphragm 5 from the inside to the outside, and the valve disk fastening screw 7 passes through the diaphragm fixing disk 6 and is connected to the valve disk 8, thereby attaching the flexible seal diaphragm 5. When the valve disc 8 moves downward and approaches the valve seat 4, at least a portion of the inner ring seal protrusion 41 and the outer ring seal protrusion 42 of the valve seat 4 extend upward into the inner ring groove 82 and the outer ring groove 83, and at this time, all positions of the flexible sealing diaphragm 5 corresponding to the inner ring seal protrusion 41 and the outer ring seal protrusion 42 adaptively recess upward, causing elastic deformation, and the flexible sealing diaphragm 5 acts together with the inner ring seal protrusion 41 and the outer ring seal protrusion 42 at the two locations where elastic deformation has occurred, thereby forming the first seal structure and the second seal structure.

[0040] In one embodiment of the present application, the protruding ends of the inner ring seal projection 41 and the outer ring seal projection 42 all constitute tapered ends that press against the flexible seal diaphragm 5, and the tapered ends have tip contact surfaces that contact the flexible seal diaphragm 5 formed as arcuate surfaces, Optionally, the range of the included angle of the tapered end is between 45° and 75°; Optionally, the arc diameter of the arc surface is in the range of 0.1 mm to 0.3 mm.

[0041] Specifically, the cross sections of the inner ring seal projection 41 and the outer ring seal projection 42 may be triangular or trapezoidal, and the tips of either of these two types of annular seal projections may be tapered, which allows the flexible seal diaphragm 5 to deform more greatly when the valve disc 8 approaches the valve seat 4, which is advantageous for further enhancing the sealing effect of the seal structure. Furthermore, in this embodiment, the cross sections of the inner ring seal projection 41 and the outer ring seal projection 42 are preferably triangular, and the interior angle of the tapered end (in this embodiment, the interior angle here refers to the smaller of the two angles formed by the opposing vertical side walls of the tapered end) is preferably 60°, and the tapered end is formed into an arc surface through a rounding process, with the arc diameter of the arc surface ranging from 0.1 mm to 0.3 mm. In the above configuration, when inner ring seal projection 41 and outer ring seal projection 42 press flexible seal diaphragm 5 upward, damage to flexible seal diaphragm 5 due to concentration of force can be avoided.

[0042] In one embodiment of the present application, the projection height of the outer ring seal projection 42 is greater than the projection height of the inner ring seal projection 41, Optionally, the difference between the protrusion height of the outer ring seal projection 42 and the protrusion height of the inner ring seal projection 41 ranges from 0.1 mm to 0.8 mm.

[0043] Specifically, the height of inner ring seal projection 41 ranges from 2.4 mm to 3.2 mm, but in this embodiment, the height of inner ring seal projection 41 is preferably 2.8 mm, and the height of outer ring seal projection 42 ranges from 2.8 mm to 3.6 mm, and in this embodiment, the height of outer ring seal projection 42 is preferably 3.2 mm. With the above configuration, if the first seal structure has sufficient sealing performance, the overall sealing performance can be further improved by forming a second seal structure with even higher sealing performance. Furthermore, when a seal structure having inner ring sealing projection 41 and outer ring sealing projection 42 configured to have the above projection height is used in a breathing valve of a storage tank, even if the valve disc 8 is pushed upward by the flow of gas inside the breathing valve of the storage tank and becomes eccentrically tilted (i.e., the heights of the radially opposing sides of the valve disc 8 are different), if the higher inner ring sealing projection 41 comes out of the inner ring groove 82, the above configuration will cause a part of the outer ring sealing projection 42 to extend into the outer ring groove 83, i.e., the protruding end of the outer ring sealing projection 42 will press against the flexible sealing diaphragm 5, ensuring that the flexible sealing diaphragm 5 elastically extends toward the inside of the outer ring groove 83.In other words, even in this case, the seal structure can ensure good sealing properties and there are no concerns about gas leakage, etc. Furthermore, if there are multiple inner ring grooves 82, outer ring grooves 83, inner ring seal projections 41, and outer ring seal projections 42, not only will production costs increase, but because there will be differences in the height of each seal projection in the same radial direction, the depth of the annular grooves is limited, making it difficult for all seal projections to extend into their corresponding annular grooves at the same time, and as a result, improvement in the sealing performance of the seal structure will not be proportional to the number of seal projections or the number of annular grooves. Therefore, to keep production costs down and ensure sufficient sealing effect of the seal structure, the number of inner ring grooves 82, outer ring grooves 83, inner ring seal projections 41, and outer ring seal projections 42 is preferably one.

[0044] Furthermore, in this embodiment, the diameter of the inner ring seal protrusion 41 corresponds to the inner diameter of the interface flange of the storage tank's breathing valve, and the diameter of the inner ring seal protrusion 41 is D. The difference between the diameters of the outer ring seal protrusion 42 and the inner ring seal protrusion 41 ranges from 14 mm to 30 mm, and optionally, in this embodiment, the difference between the diameters of the outer ring seal protrusion 42 and the inner ring seal protrusion 41 is 20 mm. The width of the inner ring groove 82 is preferably 6 mm, and the depth of the inner ring groove 82 is preferably 2.8 mm, and the size of the diameter D1 of the center annular line of the inner ring groove 82 corresponds to D. The difference between the diameter D2 of the center annular line of the outer ring groove 83 and the diameter D1 of the center annular line of the inner ring groove 82 ranges from 14 mm to 30 mm, and optionally, in this embodiment, the difference between the diameter D2 of the center annular line of the outer ring groove 83 and the diameter D1 of the center annular line of the inner ring groove 82 is 20 mm. Referring to FIG. 3, the width of the outer ring groove 83 is preferably 10 mm, and the depth of the outer ring groove 83 is preferably 2.8 mm.

[0045] In one embodiment of the present application, the seal structure comprises: a buffer ring 9 disposed in the recessed groove of the outer ring groove 83, and the protruding end of the outer ring seal protrusion 42 presses the flexible seal diaphragm 5 toward the buffer ring 9; Optionally, the material of the buffer ring 9 is a polyurethane elastomer.

[0046] Specifically, the buffer ring 9 in this embodiment is a non-Newtonian fluid buffer ring made of polyurethane elastomer. This buffer ring has the property of sinking slowly when lightly touched and rebounding rapidly when strongly touched, allowing it to slowly accommodate the outer ring sealing protrusion 42 when the valve disc 8 is stationary. This protects the flexible sealing diaphragm 5 and reduces impact loss when the impact force is large when the valve disc 8 is seated after opening.

[0047] In one embodiment of the present application, the corner joints between the side wall of the inner ring groove 82, the side wall of the outer ring groove 83, and the tight-fitting sealing surface of the valve disc 8 all transition along a smooth arc, Optionally, the radian range of the transition arc formed is 1.1 rad to 1.2 rad.

[0048] Specifically, the corner positions of the vertical side walls of the inner ring groove 82 and the outer ring groove 83, and the top wall of the cavity of the valve disc 8 (i.e., the tight-fitting sealing surface of the valve disc 8) transition along a smooth arc, and when the flexible sealing diaphragm 5 is recessed into the inner ring groove 82 and the outer ring groove 83, the above configuration can reduce the pressure exerted by both sides of the bottom ends of the inner ring groove 82 and the outer ring groove 83 on the flexible sealing diaphragm 5, and further reduce wear of the flexible sealing diaphragm 5. Furthermore, in this embodiment, the radian of the formed transition arc is 1.15 rad, Furthermore, the corner joint between the side wall of the inner ring groove 82 and the top wall of the inner ring groove 82 also transitions in a smooth arc, and the corner position between the side wall of the outer ring groove 83 and the top wall of the outer ring groove 83 also transitions in a smooth arc, and the radian range of the transition arcs at the above two locations is all 1.1 rad to 1.2 rad, and furthermore, in this embodiment, the radian range of the transition arcs at the above two locations is all 1.15 rad.

[0049] In one embodiment of the present application, as shown in FIG. 4, the flexible sealing diaphragm 5 includes a polymer sheet layer 51 and a fluororubber composite material layer 52, which are laminated together. Optionally, the fluororubber composite layer 52 is made of a raw material composition containing a fluororubber, an inorganic filler, an acid absorbent, a vulcanizing agent, a mold release agent, and a colorant; Optionally, the polymer sheet forming the polymer sheet layer 51 is one or more selected from polyetheretherketone, polytetrafluoroethylene, and polyimide; Optionally, the thickness of the polymer sheet layer 51 is between 0.1 mm and 1 mm; Optionally, the thickness ratio of the polymer sheet layer 51 to the fluororubber composite layer 52 is in the range of 1:1 to 1:4; Optionally, the flexible sealing diaphragm 5 is toroidal.

[0050] Specifically, in the flexible sealing diaphragm 5, the polymer sheet layer 51 plays a supporting role, preventing the diaphragm from being too soft and causing its edges to sag, reducing sealing performance and further causing gas leakage from the storage tank's breathing valve. The polymer sheet is pre-treated with a lubricant and thermal conductive agent, resulting in excellent lubrication, thermal conductivity, and abrasion resistance. The fluororubber composite layer 52 has good elasticity and appropriate elastic deformation, providing excellent sealing performance for the storage tank's breathing valve. The combination of the polymer sheet layer 51 and the fluororubber composite layer 52 significantly reduces leakage from the storage tank's breathing valve. Furthermore, the sealing diaphragm 5 made of the above materials also has good durability and ductility, ensuring the sealing structure's long-term sealing effect and helping to maintain the reliability of the storage tank's breathing valve.

[0051] In specific embodiments, the thickness of the polymer sheet layer 51 may be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1 mm.

[0052] In the flexible sealing diaphragm 5, the thicknesses of the polymer sheet layer 51 and the fluororubber composite layer 52 must satisfy a predetermined relationship to satisfy basic usage requirements. In a specific embodiment, the thickness of the fluororubber composite layer 52 is equal to the thickness of the polymer sheet layer 51, or the thickness of the fluororubber composite layer 52 is greater than the thickness of the polymer sheet layer 51. In a preferred embodiment, the thickness ratio of the polymer sheet layer 51 to the fluororubber composite layer 52 is in the range of 1:1 to 1:4, and specifically may be, for example, 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.

[0053] In the flexible sealing diaphragm 5, the polymer sheet layer 51 is formed of a polymer sheet. In a specific embodiment, the polymer sheet forming the polymer sheet layer 51 may be a material known to those skilled in the art, and specifically, the polymer sheet may be one or more selected from polyetheretherketone (PEEK), polytetrafluoroethylene (PTFE), and polyimide (PI), and is most preferably polytetrafluoroethylene.

[0054] In an optional embodiment, the polymer sheet layer 51 is entirely formed of a polymer sheet, and the polymer sheet needs to be pre-treated before use, including adding lubricants and thermal conductive agents to improve its lubricity, thermal conductivity, and abrasion resistance, and further surface treatment of the polymer sheet.

[0055] As for the flexible sealing diaphragm 5, the inventors of the present application have conducted research and found that when a composite diaphragm made of a fluororubber composite layer 52 made from a raw material containing fluororubber and a polymer sheet layer 51 is used as a sealing material for a breathing valve of a storage tank, leakage can be significantly reduced. In the present application, the fluororubber composite layer 52 is made from a raw material composition containing fluororubber, an inorganic filler, an acid absorbent, a vulcanizing agent, a mold release agent, and a colorant. The fluororubber composite layer 52 is produced by kneading, refining, heat-adhering, and vulcanizing the raw material composition.

[0056] In one embodiment of the present application, the fluororubber may be any fluororubber known in the art, as long as it can maintain the shape and mechanical strength of the gasket in an oily or acidic / basic environment. In a specific embodiment, the fluororubber in the raw material composition may be 26-type fluororubber and / or 246-type fluororubber.

[0057] In one embodiment of the present application, the inorganic filler may be any material commonly selected in the art, as long as it can fill rubber. In a preferred embodiment, in order to ensure that the flexible sealing diaphragm 5 has a good yield deformation over the leakage section from 0.75 times the opening pressure of the breathing valve of the storage tank to the opening pressure or less, and to further reduce the leakage rate of the breathing valve of the storage tank, the inorganic filler in the raw material composition is one or more selected from white carbon, calcium silicate, magnesium silicate, aluminum silicate, calcium carbonate, barium sulfate, diatomaceous earth, graphite, silicon nitride, and boron nitride.

[0058] In one embodiment of the present application, the acid absorbent refers to an additive that absorbs acidic substances released during rubber production. The acid absorbent may be one commonly selected in the art, as long as it can absorb acidic substances released during rubber production. In a preferred embodiment, the acid absorbent in the raw material composition is one or more selected from magnesium oxide, calcium oxide, zinc oxide, and calcium hydroxide.

[0059] In one embodiment of the present application, the vulcanizing agent may be selected from those commonly used in the art. In a specific embodiment, the vulcanizing agent in the raw material composition is one or more selected from N,N'-dicinnamylidene-1,6-hexanediamine, 2,2-(4-hydroxyphenyl)hexafluoropropane, diisopropylbenzene peroxide, and 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane.

[0060] In one embodiment of the present application, the release agent may be any release agent known to those skilled in the art. In a specific embodiment, the release agent in the raw material composition is one or more selected from zinc stearate, ammonium stearate, and paraffin.

[0061] In one embodiment of the present application, the colorant may be any colorant known to those skilled in the art as long as it can color the composite diaphragm. In a specific embodiment, the colorant in the raw material composition is one or more selected from iron oxide, colloidal graphite, and carbon black.

[0062] In one embodiment of the present application, the amounts of the fluororubber, inorganic filler, acid absorbent, vulcanizing agent, mold release agent, and colorant used need to be reasonably controlled to improve the yield recovery of the fluororubber composite layer 52 and further reduce leakage from the storage tank breathing valve. In a specific embodiment, the weight ratio of the amounts of the fluororubber, inorganic filler, acid absorbent, vulcanizing agent, mold release agent, and colorant used in the raw material composition may be 100:(10-60):(0.001-20):(0.001-5):(0.2-2):(0.001-3).

[0063] In one embodiment of the present application, whether or not a vulcanization accelerator is added to the raw materials for producing the fluororubber composite material layer 52 is determined as needed. In a specific embodiment, the raw material composition also contains a vulcanization accelerator. In a preferred embodiment, the weight ratio of the fluororubber to the vulcanization accelerator is 100:0.001 to 2, and specifically, for example, may be 100:0.001, 100:0.1, 100:0.2, 100:0.5, 100:0.6, 100:0.7, 100:0.8, 100:0.9, or 100:1. The vulcanization accelerator is preferably triallyl isocyanurate.

[0064] In the seal structure of the present application, the hardness of the flexible seal diaphragm 5 is preferably HR50-HR75, most preferably HR60.

[0065] In the seal structure of the present application, the annular flexible seal diaphragm 5 is designed to a size that can cover all of the annular grooves of the valve disc 8 .

[0066] In the seal structure of the present application, the coverage area of ​​the flexible sealing diaphragm 5 is not particularly limited, as long as it completely covers all of the annular grooves of the valve disc 8. Preferably, the coverage area of ​​the flexible sealing diaphragm 5 is such that, even when the sealing protrusions of the valve seat 4 are fully inserted into the annular grooves of the valve disc 8, the outer and inner peripheries of the flexible sealing diaphragm 5 completely cover the outermost and innermost annular grooves of the valve disc 8, respectively. In some embodiments, when the flexible sealing diaphragm 5 is annular, the outer diameter of the flexible sealing diaphragm 5 is 1 mm to 30 mm, preferably 5 mm to 20 mm, larger than the outer diameter of the outermost annular groove of the valve disc 8, and the inner diameter of the flexible sealing diaphragm 5 is 1 mm to 30 mm, preferably 5 mm to 20 mm smaller than the inner diameter of the innermost annular groove of the valve disc 8.

[0067] In the seal structure of the present application, the valve disc 8 is a rotor valve disc that can rotate by itself due to the flow of overflow gas. As shown in Figures 2 and 3, for example, the rotor valve disc is a disk body having both an inner ring groove 82 and an outer ring groove 83 formed on the disk surface; a rotor ring that is suspended downward from the periphery of the disk body and includes a plurality of rotors 81 that are spaced apart from one another in the circumferential direction, with gap-like gas flow channels formed between adjacent two rotors 81, and an overflow gas flow that flows from the inside to the outside through the gap-like gas flow channels drives the valve disk 8 to rotate itself; Optionally, the rotor radian is between 0.3 rad and 0.4 rad; Optionally, the number of rotors is between 15 and 20; Optionally, the width of the interstitial gas flow channels ranges from 3mm to 6mm.

[0068] Specifically, as shown in FIGS. 2 and 3, the valve disc 8 has an integrally molded structure (i.e., the disc body and the rotor ring are integrally molded). The material of the valve disc 8 may be a corrosion-resistant material such as stainless steel or polyphenylene sulfide. The difference between the outer diameter D3 of the valve disc 8 and the diameter D1 of the center annular line of the inner ring groove 82 ranges from 40 mm to 60 mm. In this embodiment, the number of rotors 81 is preferably 17. If the radius of each rotor 81 is R, then R = (0.15 to 0.25) * D. Two adjacent rotors 81 are staggered circumferentially on the valve disc 8. Furthermore, in this embodiment, the width of the gap-like gas flow channel is preferably 5 mm. If the height of the rotor 81 is h, then h = 0.628 * (0.1 * D + 12). In the above design, the valve disc 8 jumps to its maximum height at 1.07 times the opening pressure, and the rotation speed of the valve disc 8 after opening reaches 20 r / s to 30 r / s. This is beneficial for maintaining the stability of the valve disc 8 itself, and also enables the centrifugal force to remove dirt and dust accumulated on the valve disc 8, realizing self-cleaning. In addition, an 8 mm wide ring is provided on the side edge of the rotor 81, which connects all the rotors 81 together and prevents the valve disc 8 from deforming as a whole.

[0069] In another embodiment of the present application, the interstitial gas flow channels may be gradually tapered in an inward-to-outward direction (not shown), i.e., the width of the interstitial gas flow channels decreases from the inside to the outside, thereby causing the pressure of the overflow gas flow to be greater at the radially outer side of the interstitial gas flow channels, and exerting greater pressure on the radially outer side walls of the interstitial gas flow channels, facilitating self-rotation of the rotor valve disc by the action of the overflow gas flow.

[0070] When the sealing structure of the above embodiment is used in a storage tank breathing valve, the inner ring sealing protrusions 41 act to cause the flexible sealing diaphragm 5 to sink 0.2 to 0.5 mm into the inner ring groove 82, and the outer ring sealing protrusions 42 act to cause the flexible sealing diaphragm 5 to sink 0.6 to 0.9 mm into the outer ring groove 83. This design achieves a double high-performance seal, where the inner ring sealing protrusions 41 and the flexible sealing diaphragm 5 sinking into the inner ring groove 82 together effectively reduce leakage from the storage tank breathing valve by 95%, and the outer ring sealing protrusions 42 and the flexible sealing diaphragm 5 sinking into the outer ring groove 83 together effectively reduce leakage from the storage tank breathing valve by 99.9999%. In addition, the buffer ring 9 is installed in the outer ring groove 83, allowing the outer ring sealing protrusions 42 to slowly accommodate when the valve disc 8 is stationary, achieving a complete seal between the valve disc 8 and the valve seat 4 and completely eliminating leakage.

[0071] The present application also discloses a breathing valve for a storage tank having a pressure end and a vacuum end therein, and as shown in Figures 9 and 10, the breathing valve for the storage tank includes the seal structure in the above embodiment, and the seal is configured at the pressure end and / or the vacuum end.

[0072] In one embodiment of the present application, as shown in Figure 9 or Figure 10, the seal structure includes a pressure end seal structure (see Figure 5) provided at the pressure end and a vacuum end seal structure (see Figure 7) provided at the vacuum end, and a valve stem 10 is connected to a valve disc 8 of the seal structure, and the valve stem 10 connected to the pressure end seal structure extends from the disc surface of the valve disc 8 in a direction opposite to the valve seat 4, and the valve stem 10 connected to the vacuum end seal structure extends from the disc surface of the valve disc 8 in a direction on the same side as the valve seat 4.

[0073] Furthermore, at the pressure end, a pressure end mounting seat 1 extending radially inward is formed on the inner wall of the housing of the storage tank breathing valve, and the valve seat 4 of the pressure end seal structure is seated on the periphery of the seat body of the pressure end mounting seat 1 and firmly connected, and an annular seal ring 3 is provided at the contact part between the bottom of the valve seat 4 and the periphery of the seat body.

[0074] Specifically, the storage tank breathing valve further includes a housing, within which a pressure chamber 18 and a vacuum chamber 19 are formed below the pressure chamber 18. The pressure end is located within the pressure chamber 18, and the vacuum end is located above the vacuum chamber 19. At the pressure end, a pressure end mounting seat 1 is provided within the storage tank breathing valve, and a pressure end valve hole is formed in the pressure end mounting seat 1. A valve seat 4 is attached to the pressure end valve hole. The valve seat 4 is machined as a whole. The height of the valve seat 4 ranges from 30 mm to 40 mm, but in this embodiment, the height of the valve seat 4 is preferably 35 mm. At this height, the valve seat 4 can maintain its strength, and its deformation is controlled to less than 0.1%. An annular seal ring 3 is provided at the contact portion between the bottom of the valve seat 4 and the periphery of the seat body of the pressure end mounting seat 1. The valve seat 4 is fixed to the pressure end mounting seat 1 with four valve seat fastening screws 2. The above structural design has the advantages of excellent sealing, resistance to deformation, and ease of installation, removal, and repair. Furthermore, at the pressure end, the valve disc 8 is machined from a single piece of material, and the material of the valve disc 8 is optionally a corrosion-resistant material such as stainless steel or polyphenylene sulfide.

[0075] At the pressure end, a valve stem positioning sleeve 12 fitted onto the valve stem 10 of the pressure end seal structure is fixedly provided inside the breathing valve of the storage tank, and as shown in Figure 6, a plurality of positioning balls 121 are provided between the inner peripheral wall of the valve stem positioning sleeve 12 and the outer peripheral side of the valve stem 10, and the plurality of positioning balls 121 are spaced apart in the circumferential direction and stacked in the axial direction.

[0076] Specifically, at the pressure end, the valve stem 10 is disposed above the valve disc 8 and screwed into the center of the top surface of the valve disc 8. The valve stem 10 is made of stainless steel. The upper end of the valve stem positioning sleeve 12 is connected to the housing of the storage tank's breathing valve. The valve stem positioning sleeve 12 is located at the center of the pressure chamber 18 in the horizontal direction and is used to control the displacement of the valve stem 10. The number of rows of positioning balls 121 in the vertical direction ranges from 5 to 20. Four positioning balls 121 are distributed at equal intervals in the circumferential direction. The positioning balls 121 are made of ceramic and the particle size range of the positioning balls 121 is 2 mm to 4 mm. In the above configuration, the positioning ball 121 in the valve stem positioning sleeve 12 can effectively convert any lateral force applied to the valve stem 10 at the pressure end into a longitudinal force, thereby reducing fatigue damage to the valve stem 10, preventing eccentric rotation of the pressure end valve disc 8, keeping the concentricity deviation of the pressure end valve disc 8 when returning to less than 0.05 mm, and improving the sealing effect between the pressure end valve disc 8 and the valve seat 4.

[0077] Additionally, at the pressure end, the central axes of the valve stem positioning sleeve 12, the valve disc 8, and the pressure end valve bore overlap.

[0078] In one embodiment of the present application, a bushing 11 is fitted onto the outside of the valve stem 10 , and the outer peripheral wall of the bushing 11 contacts the positioning ball 121 .

[0079] Specifically, the bushing 11 is made of a PEEK composite graphite material, which prevents corrosion of the valve stem 10 due to the medium sprayed from the storage tank's breathing valve. Furthermore, the bushing 11 made of this material has excellent self-lubrication, electrostatic conductivity, and low-temperature resistance, allowing the storage tank's breathing valve to function normally even in temperatures as low as -40°C. Furthermore, the distance between the bushing 11 and the positioning ball 121 is 0.1 mm, which effectively converts any lateral force applied to the bushing 11 and valve stem 10 at the pressure end into a longitudinal force, thereby preventing eccentric rotation of the valve disc 8 at the pressure end.

[0080] In one embodiment of the present application, at the vacuum end, the breathing valve of the storage tank is a vacuum end mounting seat 13 provided in the housing of the breathing valve of the storage tank, used to mount the vacuum end seal structure, and having a vacuum end valve hole formed around it; a valve stem fixing disk 15 that is provided on the side of the vacuum end mounting seat 13 that is away from the valve disk 8 of the vacuum end seal structure and covers the vacuum end valve hole; a valve stem positioning sleeve 12 inserted into a valve stem fixing disk 15, wherein a valve stem 10 having a vacuum end seal structure passes through the valve stem positioning sleeve 12 and is connected to the valve disk 8; The valve stem further includes a plurality of positioning balls 121 that are provided between the inner peripheral wall of the valve stem positioning sleeve 12 and the outer peripheral side of the valve stem 10, are spaced apart in the circumferential direction, and are stacked in the axial direction.

[0081] Specifically, the storage tank's breathing valve has a vacuum end mounting seat 13 below the pressure end mounting seat 1, a vacuum end valve hole formed in the vacuum end mounting seat 13, and a valve seat 4 installed in the vacuum end valve hole and fixed to the vacuum end mounting seat 13 by four valve seat fastening screws 2. The vacuum end valve disc 8 is made of stainless steel sheet or stamped from a corrosion-resistant material such as polyphenylene sulfide to meet the opening pressure requirement of -300 Pa.

[0082] As shown in Figures 7 and 8, at the vacuum end, the storage tank breathing valve further includes a press end cap 14 located above the center of the valve disc 8, and a valve stem fixing disc 15 is fixed below the vacuum end mounting seat 13 with a fastening screw. The valve stem 10 at the vacuum end is a "U"-shaped valve stem, and a valve stem positioning sleeve 12 is located at the center of the valve stem fixing disc 15. The upper end of the valve stem 10 passes through the valve stem positioning sleeve 12, diaphragm fixing disc 6, and valve disc 8 from bottom to top and is connected to the press end cap 14. A fastening nut 16 located below the diaphragm fixing disc 6 is fitted onto the valve stem 10, and the fastening nut 16 and the press end cap 14 act together to tighten and attach the valve stem 10, diaphragm fixing disc 6, and valve disc 8. The number of rows of the positioning balls 121 in the vertical direction ranges from 5 to 9, and the four positioning balls 121 are evenly spaced in the circumferential direction. The positioning balls 121 are made of ceramic, and the particle size ranges from 2 mm to 4 mm. The distance between the valve stem 10 and the positioning balls 121 is 0.1 mm. In the above configuration, the positioning balls 121 in the valve stem positioning sleeve 12 can effectively convert any force applied laterally to the valve stem 10 at the vacuum end into a force applied vertically, thereby dispersing stiffness stress and reducing fatigue damage to the valve stem 10, which is beneficial to improving the durability of the valve stem 10 and the storage tank breathing valve. In addition, the positioning ball 121 is also advantageous in reducing the movement resistance of the valve stem 10, which in turn improves the smooth rotation of the valve stem 10 and the valve disc 8 and prevents the valve stem 10 from getting stuck. It also prevents the eccentric rotation of the vacuum end valve disc 8, keeping the coaxiality deviation of the vacuum end valve disc 8 when it returns to less than 0.05 mm, and further improves the sealing effect between the vacuum end valve disc 8 and the valve seat 4.

[0083] Furthermore, at the vacuum end, the central axis of the valve stem fixing disk 15, the central axis of the valve disk 8, and the central axis of the vacuum end valve hole overlap.

[0084] In one embodiment of the present application, the valve seat 4 of the vacuum end seal structure is seated on the periphery of the seat body of the vacuum end mounting seat 13 and firmly connected to it, and an annular seal ring 3 is provided at the contact portion between the bottom of the valve seat 4 and the periphery of the seat body.

[0085] Specifically, an annular seal ring 3 is provided at the contact area between the bottom of the valve seat 4 of the vacuum end seal structure and the periphery of the seat body of the vacuum end mounting seat 13, and the valve seat 4 is fixed to the vacuum end mounting seat 13 with four valve seat fastening screws 2. The above structural design has the advantages of excellent sealing properties, resistance to deformation, and ease of installation, removal, and repair.

[0086] In one embodiment of the present application, at the vacuum end, the breathing valve of the storage tank further includes a sealing member provided at the tip of the valve stem 10 for sealing the gap between the valve stem 10 and the valve disc 8. Specifically, the sealing member is an O-seal ring 17 provided between the lower end surface of the press end cap 14 and the top surface of the valve disc 8. When the fastening nut 16 is tightened, the O-seal ring 17 is deformed, thereby sealing the gap between the valve stem 10 and the valve disc 8.

[0087] In one embodiment of the present application, the opening pressure P1 of the storage tank's breathing valve at the pressure end is adjusted by the total weight M of the valve disc 8, buffer ring 9, flexible sealing diaphragm 5, diaphragm fixing disc 6, valve disc fastening screw 7, valve stem 10, and bushing 11, and is P1=1.27*Mg / D.

[0088] In one embodiment of the present application, the opening pressure P2 (e.g., -300 Pa gauge pressure) of the storage tank's breathing valve at the vacuum end is adjusted by the total weight M of the valve disc 8, buffer ring 9, flexible sealing diaphragm 5, diaphragm fixing disc 6, fastening nut 16, O-seal ring 17, and valve stem 10, where P2=1.27*Mg / D.

[0089] In one embodiment of the present application, the storage tank breathing valve further includes an interface flange, a vacuum fireproof panel 22, a vacuum rain cover 23, a fixing long bolt, and a hanger, and a pressure chamber 18 and a vacuum chamber 19 below the pressure chamber 18 are formed inside the housing, the pressure chamber 18 is at the pressure end, and the vacuum chamber 19 is at the vacuum end, and the sealing structure, valve stem 10, valve stem positioning sleeve 12, positioning ball 121, etc. in the above embodiment are provided at all positions where the pressure end and the vacuum end are located.

[0090] Furthermore, at the pressure end, a pressure end mounting seat 1 extending radially inward is formed on the inner wall of the housing of the storage tank breathing valve, and a pressure end valve hole is formed around the pressure end mounting seat 1; at the vacuum end, a vacuum end mounting seat 13 for attaching a vacuum end seal structure is provided inside the housing of the storage tank breathing valve, and a vacuum end valve hole is formed around the vacuum end mounting seat 13; an air intake port is formed at the bottom of the housing of the storage tank breathing valve, and the central axes of the pressure end valve hole, the vacuum end valve hole, and the air intake port overlap.

[0091] Specifically, the housing of the storage tank's breathing valve has a straight cylindrical section and a tapered section tapering inward from the bottom of the straight cylindrical section, with the peripheral wall of the tapered section formed as an arc. The radius of the arc wall is D, which ranges from 0.4 rad to 0.6 rad, most preferably 0.53 rad, to achieve low pressure loss of gas flow at the interface flange. The interface flange is located below the tapered section and has an inlet port through which gas flows into the storage tank's breathing valve. The central axes of the inlet port, the pressure end valve hole, and the vacuum end valve hole are aligned, allowing the gas flow to stably enter the storage tank's breathing valve from the inlet port of the interface flange and reducing vibration of the storage tank's breathing valve. This structural design prevents eccentricity during rotation of the valve disc 8. Based on this, the inner ring seal protrusion 41 and the outer ring seal protrusion 42 can simultaneously press the seal diaphragm 5, thereby forming the first seal structure and the second seal structure, and effectively ensuring the sealing performance of the seal structure. The hanger is provided above the straight cylindrical portion.

[0092] In one embodiment of the present application, the housing of the storage tank breathing valve further includes a vacuum chamber 19 located at the vacuum end and a common chamber 20 communicating with the pressure chamber 18. The storage tank breathing valve further includes a vacuum firestop 22 located on one lateral side of the vacuum chamber 19 and fitted into the side wall of the housing. The side wall of the vacuum chamber 19 away from the vacuum firestop 22 is an arc-shaped wall, with a radian range of 1 rad to 1.1 rad, most preferably 1.05 rad. The inner diameter of the interface flange of the storage tank breathing valve (i.e., the diameter of the intake port of the storage tank breathing valve) is D, and the radius of the arc-shaped wall is preferably 0.5 to 0.75D, most preferably 2D / 3. With this configuration, gas in the common chamber 20 uniformly enters the pressure chamber 18, or air in the vacuum chamber 19 uniformly enters the common chamber 20, thereby reducing pressure loss.

[0093] In one embodiment of the present application, the storage tank breathing valve further includes an arc-shaped vacuum rain cover 23 that is provided on the outside of the vacuum fireproof panel 22. Specifically, the vacuum rain cover 23 is fixed to the housing with long fixing bolts and is provided on the outside of the vacuum fireproof panel 22. When the inner diameter of the interface flange of the storage tank breathing valve (i.e., the diameter of the air inlet of the storage tank breathing valve) is D, the arc radius of the vacuum rain cover 23 is in the range of 1.4D to 1.6D, preferably 1.5D, and its radian range is 1 rad to 1.2 rad, preferably 1.1 rad. The above configuration helps to further reduce the loss of gas pressure when the storage tank breathing valve breathes.

[0094] As shown in FIG. 9, for example, the storage tank breathing valve may further include a fixed cross ring 24, a pressure fire protection panel 25, and a pressure rain cover 26. The fixed cross ring 24 is installed inside the housing and connects the valve stem positioning sleeve 12 to the housing. The pressure fire protection panel 25 is installed on the top of the housing and is located above the fixed cross ring 24. The pressure rain cover 26 is fixed to the housing with fixed long bolts and is located above the pressure fire protection panel 25. If the inner diameter of the interface flange of the storage tank breathing valve (i.e., the diameter of the intake port of the storage tank breathing valve) is D, the arc radius of the pressure rain cover 26 is in the range of 3.4D to 3.6D, preferably 3.5D, and the radian range of the pressure rain cover 26 is 0.7 rad to 0.8 rad, preferably 0.75 rad. This is advantageous for reducing gas pressure loss when the storage tank breathing valve is breathing. A hanger is installed on the top of the pressure rain cover 26.

[0095] As shown in FIG. 10, the breathing valve of the storage tank further includes a pressure pipe flame arrestor 27 and a pipe flange 21, the pressure pipe flame arrestor 27 is provided on a housing corresponding to the pressure chamber 18, the pipe flange 21 is provided on the pressure pipe flame arrestor 27, and the hanger is provided on the top of the housing.

[0096] In another embodiment of the present application, there is provided a storage tank including the breathing valve of the storage tank of the above embodiment.

[0097] The breathing valve for a storage tank and the storage tank of the present application will be further described below with reference to examples. The examples are implemented on the premise of the technical solution of the present application, and show detailed embodiments and specific operation processes, but the protection scope of the present application is not limited to the following examples.

[0098] Manufacturing Example 1 (1) Manufacturing of fluoroelastomer composite materials Fluorocarbon rubber (10 kg of Fluorocarbon Rubber 246), inorganic fillers (1 kg of calcium silicate, 1 kg of magnesium silicate, 0.5 kg of calcium carbonate, and 0.1 kg of graphite), acid absorbers (0.5 kg of calcium oxide and 0.5 kg of calcium hydroxide), vulcanizing agent (0.01 kg of 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane), vulcanization accelerator (0.01 kg of triallyl isocyanurate), release agent (0.01 kg of paraffin), and colorant (0.15 kg of iron oxide) were added to a kneader and kneaded at 50 rpm for 30 min at 70 °C. The resulting product was then refined 30 times with a roll distance of 1 mm at a roll temperature of 140 °C to obtain a fluorocarbon rubber composite.

[0099] (2) Manufacturing of composite diaphragms The fluororubber composite material was spread on a 0.2 mm thick PTFE polymer sheet and heat-bonded at 160°C for 10 minutes to obtain a pre-vulcanized composite diaphragm. The diaphragm was then vulcanized at 240°C for 16 hours to obtain a composite diaphragm comprising a 0.7 mm fluororubber composite layer and a 0.2 mm PTFE polymer sheet layer.

[0100] Example 1 As shown in Figures 1 to 9, the housing of the storage tank breathing valve has a straight cylindrical portion and a tapered portion whose diameter tapers inward from the bottom of the straight cylindrical portion. An interface flange is provided below the tapered portion, and the peripheral wall of the tapered portion is formed as a circular arc wall. The radius of the circular arc wall is D, and its radian is 0.53 rad to achieve low pressure loss of gas flow at the interface flange. A hanger is provided above the straight cylindrical portion. A pressure chamber 18, a vacuum chamber 19, and a common chamber 20 are formed inside the housing, and are connected to each other. The pressure end is located within the pressure chamber 18, and the vacuum end is located above the vacuum chamber 19. A vacuum firestop 22 is located on one lateral side of the vacuum chamber 19 and is embedded in the side wall of the housing. The side wall of the vacuum chamber 19 away from the vacuum firestop 22 is a circular arc wall, and the radian of the circular arc wall is 1.05 rad. If the inner diameter of the interface flange of the storage tank's breathing valve (i.e., the diameter of the inlet of the storage tank's breathing valve) is D, the radius of the arc wall is 2D / 3. The vacuum fireproof panel 22 is located on one lateral side of the vacuum chamber 19 and is fitted into the side wall of the housing, and the side wall of the vacuum chamber 19 away from the vacuum fireproof panel 22 is an arc wall, and the radian of the arc wall is 1.05 rad. If the inner diameter of the interface flange of the storage tank's breathing valve (i.e., the diameter of the inlet of the storage tank's breathing valve) is D, the radius of the arc wall is 2D / 3. A fixed cross ring 24 is installed inside the housing, a pressure fireproof panel 25 is installed on the top of the housing and fixed above the cross ring 24, a pressure rain cover 26 is fixed to the housing with fixed long bolts and is located above the pressure fireproof panel 25, where D is the inner diameter of the interface flange of the storage tank's breathing valve (i.e., the diameter of the air inlet of the storage tank's breathing valve), the arc radius of the pressure rain cover 26 is 3.5D, and the radian of the pressure rain cover 26 is 0.75 rad. A hanger is installed on the top of the pressure rain cover 26.

[0101] The pressure end and vacuum end of the storage tank's breathing valve are provided with a pressure end seal structure and a vacuum end seal structure, respectively. The pressure end seal structure and vacuum end seal structure each include a valve seat 4, a valve disc 8, and a flexible sealing diaphragm 5. The valve seat 4 has a height of 35 mm. An inner ring groove 82 and an outer ring groove 83 are formed on the sealing surface of the valve disc 8, and the flexible sealing diaphragm 5 is covered by the sealing surface of the valve disc 8. An inner ring seal protrusion 41 and an outer ring seal protrusion 42 are formed on the sealing side of the valve seat 4, and the flexible sealing diaphragm 5 is pressed against the sealing surface of the valve disc 8 by the diaphragm fixing disc 6. The protruding ends of the inner ring seal protrusion 41 and the outer ring seal protrusion 42 all form tapered ends that press against the flexible sealing diaphragm 5, and the tip contact surfaces of the tapered ends that contact the flexible sealing diaphragm 5 are formed as arc surfaces. The cross sections of the inner ring seal projection 41 and the outer ring seal projection 42 are preferably triangular, with the inner angle of the tapered end being 60°. The projection height of the outer ring seal projection 42 is greater than that of the inner ring seal projection 41, with the height of the inner ring seal projection 41 being 2.8 mm and the height of the outer ring seal projection 42 being 3.2 mm. The diameter of the inner ring seal projection 41 matches the inner diameter of the interface flange of the storage tank's breathing valve, with the diameter of the inner ring seal projection 41 being D, the difference between the diameters of the outer ring seal projection 42 and the inner ring seal projection 41 being 20 mm. The width of the inner ring groove 82 is 6 mm, the depth of the inner ring groove 82 is 2.8 mm, and the size of the diameter D1 of the center annular line of the inner ring groove 82 matches D. The difference between the diameter D2 of the central annular line of the outer annular groove 83 and the diameter D1 of the central annular line of the inner annular groove 82 is 20 mm, the width of the outer annular groove 83 is 10 mm, and the depth of the outer annular groove 83 is 2.8 mm.

[0102] The pressure end seal structure and the vacuum end seal structure further include a buffer ring 9 disposed in the groove of the outer ring groove 83. The buffer ring 9 is a non-Newtonian fluid buffer ring made of polyurethane elastomer. The corner positions between the side walls of the inner ring groove 82, the side walls of the outer ring groove 83, and the sealing surface of the valve disc 8 transition along a smooth arc, and the radian of the formed transition arc is 1.15 rad. The flexible sealing diaphragm 5 includes a polymer sheet layer 51 and a fluororubber composite layer 52 stacked together, the fluororubber composite layer 52 being made of a raw material composition containing fluororubber, an inorganic filler, an acid absorbent, a vulcanizing agent, a release agent, and a colorant, the polymer sheet forming the polymer sheet layer 51 being selected from polyether ether ketone, polytetrafluoroethylene, and polyimide, the thickness of the polymer sheet layer 51 being 0.1, the thickness ratio of the polymer sheet layer 51 to the fluororubber composite layer 52 being in the range of 1:1, the flexible sealing diaphragm 5 being annular, and the hardness of the flexible sealing diaphragm 5 being HR60, The valve disc 8 is a rotor valve disc, and the rotor valve disc includes a disc body having both an inner ring groove 82 and an outer ring groove 83 formed on its disc surface, and a rotor ring suspended downward from the periphery of the disc body and including a plurality of rotors 81 spaced apart from one another in the circumferential direction, with a gap-like gas flow channel formed between two adjacent rotors 81, the rotor radian being 0.35 rad, the number of rotors being 17, and the width of the gap-like gas flow channel being 5 mm; A valve stem 10 is connected to the valve disc 8 of the seal structure, and the material of the valve stem 10 is stainless steel. The valve stem 10 connected to the pressure end seal structure extends from the disc surface of the valve disc 8 in a direction opposite to the valve seat 4, and the valve stem 10 connected to the vacuum end seal structure extends from the disc surface of the valve disc 8 in a direction on the same side as the valve seat 4. At the pressure end, a pressure end mounting seat 1 extending radially inward is formed on the inner wall of the housing of the storage tank breathing valve. The valve seat 4 of the pressure end seal structure is seated on and firmly connected to the periphery of the seat body of the pressure end mounting seat 1, and an annular seal ring 3 is provided at the contact portion between the bottom of the valve seat 4 and the periphery of the seat body.

[0103] At the pressure end, a valve stem positioning sleeve 12 is fixedly mounted within the storage tank's breathing valve, fitted onto a valve stem 10 with a pressure end seal structure. A plurality of positioning balls 121 are mounted between the inner peripheral wall of the valve stem positioning sleeve 12 and the outer peripheral side of the valve stem 10. The positioning balls 121 are spaced apart circumferentially and stacked in the axial direction. The number of rows of the positioning balls 121 in the vertical direction is 10. Four positioning balls 121 are equally spaced apart circumferentially. The positioning balls 121 are made of ceramic and have a particle size range of 3 mm. A bushing 11 is fitted onto the outside of the valve stem 10, and the outer peripheral wall of the bushing 11 contacts the positioning balls 121. The bushing 11 is made of a PEEK composite digraphite material.

[0104] At the vacuum end, the storage tank breathing valve further includes a vacuum end mounting seat 13, which is installed within the storage tank breathing valve housing and is used to mount the vacuum end seal structure, and which has a vacuum end valve hole formed around it; a valve stem fixing disk 15, which is installed on the side of the vacuum end mounting seat 13 away from the valve disk 8 of the vacuum end seal structure and covers the vacuum end valve hole; a valve stem positioning sleeve 12 inserted into the valve stem fixing disk 15, through which the valve stem 10 of the vacuum end seal structure passes and is connected to the valve disk 8; and a plurality of positioning balls 121, which are arranged between the inner peripheral wall of the valve stem positioning sleeve 12 and the outer peripheral side of the valve stem 10, are spaced apart circumferentially and stacked axially. The valve stem 10 is a "U"-shaped valve stem. There are seven rows of positioning balls 121 in the vertical direction, and four positioning balls 121 are distributed at equal intervals in the circumferential direction. The positioning balls 121 are made of ceramic, with a particle size range of 3 mm, and the distance between the valve stem 10 and the positioning balls 121 is 0.1 mm. The valve seat 4 of the vacuum end seal structure is seated on and firmly connected to the periphery of the seat body of the vacuum end mounting seat 13, and an annular seal ring 3 is provided at the contact portion between the bottom of the valve seat 4 and the periphery of the seat body.

[0105] Example 2 The storage tank breathing valve in Example 1 is adopted, where the inner diameter of the interface flange (i.e., the diameter of the inlet of the storage tank breathing valve) D is 300 mm, and is called the storage tank breathing valve A1.

[0106] Using the VENTIL CT800-T4 storage tank breathing valve test equipment, the breathing valve A1 of the storage tank was tested with an opening pressure of 1350 Pa at the pressure end and an opening pressure of -300 Pa at the vacuum end. The test was conducted in accordance with the methods of the standard API2000-2014 "Venting Atmospheric and Low-pressure Storage Tanks" and ISO 28300-2008 "Petroleum, petrochemical and natural gas industries - Venting of atmospheric and low-pressure storage tanks".

[0107] As a result, the storage tank's breathing valve A1 has a leakage rate of 0 Nml / min at a test pressure of 1012 Pa (1350 Pa * 75%), and when the leakage rate of the storage tank's breathing valve A1 is 1 Nml / min, the test pressure is 1300 Pa, which reaches 96% of the opening pressure. The storage tank's breathing valve A1 has a leakage rate of 0 Nml / min at a test pressure of -225 Pa (-300 Pa * 75%), and when the leakage rate of the storage tank's breathing valve A1 is 1 Nml / min, the test pressure is -290 Pa, which reaches 96% of the opening pressure.

[0108] Example 3 The storage tank breathing valve in Example 1 is adopted, where the inner diameter of the interface flange (i.e., the diameter of the inlet of the storage tank breathing valve) D is 150 mm, and is called storage tank breathing valve A2.

[0109] The VENTIL CT800-T4 storage tank breathing valve test device was used to test the storage tank breathing valve A2, with the pressure end opening pressure set to 1750 Pa and the vacuum end opening pressure set to -300 Pa. The test was performed in accordance with the standard API 2000-2014 "Venting Atmospheric and Low-pressure Storage Tanks" and ISO 28300-2008 "Petroleum, petrochemical and natural gas industries - Venting of atmospheric and low-pressure storage tanks".

[0110] As a result, the storage tank's breathing valve A2 has a leakage rate of 0 Nml / min at a test pressure of 1310 Pa (1750 Pa * 75%), and when the leakage rate of the storage tank's breathing valve A2 is 1 Nml / min, the test pressure is 1700 Pa, which reaches 97% of the opening pressure. The storage tank's breathing valve A2 has a leakage rate of 0 Nml / min at a test pressure of -225 Pa (-300 Pa * 75%), and when the leakage rate of the storage tank's breathing valve A2 is 1 Nml / min, the test pressure is -290 Pa, which reaches 96% of the opening pressure.

[0111] Example 4 The storage tank breathing valve in Example 1 is adopted, where the inner diameter of the interface flange (i.e., the diameter of the inlet of the storage tank breathing valve) D is 200 mm, and is called storage tank breathing valve A3.

[0112] Using the VENTIL CT800-T4 storage tank breathing valve test device, the storage tank breathing valve A3 was tested with an opening pressure of 1350 Pa at the pressure end and -300 Pa at the vacuum end. The test was conducted in accordance with the standard API 2000-2014 "Venting Atmospheric and Low-pressure Storage Tanks" and ISO 28300-2008 "Petroleum, petrochemical and natural gas industries - Venting of atmospheric and low-pressure storage tanks".

[0113] As a result, the storage tank's breathing valve A3 had an initial leakage rate of 0 Nml / min at a test pressure of 1012 Pa (1350 Pa * 75%), and a leakage rate of 1 Nml / min at 1300 Pa (1350 Pa * 96%). After being left stationary for 365 consecutive days, the leakage rate was tested every 10 days, and the average leakage rate was 1.2 Nml / min. After dismantling, it was found that the flexible sealing diaphragm was deformed by 0.8%, but still maintained good elasticity.

[0114] The storage tank's breathing valve A3 was repeatedly tested at an opening pressure of 1350 Pa. At a test pressure of 1012 Pa (1350 Pa * 75%), the initial leakage rate was 0 Nml / min, and at 1300 Pa (1350 Pa * 96%), the leakage rate was 1 Nml / min. After 110,000 tests, the leakage rate was 0 Nml / min at a test pressure of 1012 Pa, 39 Nml / min at 1300 Pa, and 1 Nml / min at 1300 Pa after 20 minutes of rest. This shows that the composite flexible sealing diaphragm has a very high self-healing function.

[0115] Example 5 In this example, the breathing valve A3 of the storage tank was used for the experiment.

[0116] A phx42-7314 total hydrocarbon analyzer from LDARtools, Germany, was used to conduct LDAR testing on the storage tank's breathing valve. The testing method was in accordance with HJ1230-2021, "Detection and Repair of Volatile Organic Compound Leaks in Industrial Enterprises." The breathing valve A3 was installed on top of a 5,000 cubic meter benzene storage tank. Measurements were conducted at a pressure of 1,020 Pa, revealing a VOC concentration of 0 ppm at the outlet of the breathing valve A3. Measurements were conducted at a pressure of 1,300 Pa, revealing a VOC concentration of 0.3 ppm at the outlet of the breathing valve A3. This indicates that the breathing valve on the storage tank has a relatively good sealing effect and a relatively low leakage rate.

[0117] After one year of use, the storage tank breathing valve A3 was disassembled for annual inspection and the internal condition was inspected. The initial surface roughness of the valve stem of the storage tank breathing valve A3 was 8μm. After one year, the valve stem of the storage tank breathing valve A3 had a smooth and uniform surface with a maximum roughness of 8.5μm. This confirmed that the rotor valve disc was firmly centered when opened, solving the problem of unstable air flow caused by the eccentricity of the normal valve disc.

[0118] Furthermore, the composite flexible sealing diaphragm used in the breathing valve A3 of the storage tank has no creases on the surface and maintains a good elastic state even when deformed by 0.5%.

[0119] As can be seen from the above embodiments, the storage tank breathing valve described in the present application can achieve a perfect seal and obtain a sealing effect that reduces leakage of the storage tank breathing valve to zero.

[0120] Example 6 The storage tank breathing valve was arranged according to the method of Example 1, with the following differences: In the first and second sealing structures, three annular grooves were formed on the underside of the valve disc 8, and three corresponding sealing protrusions were provided on the valve seat 4, with the tops of the sealing protrusions facing upward. The sealing protrusions on the valve seat 4 and the annular grooves on the valve disc 8 were arranged corresponding to each other. Here, the annular groove on the inner ring was the first annular groove, the annular groove on the middle ring was the second annular groove, and the annular groove on the outer ring was the third annular groove, and a non-Newtonian fluid buffer ring made of polyurethane elastomer was installed in the second annular groove. The corner joints between the side walls of the first, second, and third annular grooves and the sealing surface of the valve disc all transition along smooth arcs. The relationship between the diameter D1 of the center annular groove and the diameter D2 of the center annular groove is D2 = D1 + b. The relationship between the diameter D2 of the center annular groove and the diameter D3 of the center annular groove is D3 = D2 + b, where b is 15 mm and D1 = D. The first annular groove is 6 mm wide and 2.8 mm deep, the second annular groove is 10 mm wide and 2.8 mm deep, and the third annular groove is 6 mm wide and 2.8 mm deep. The seal protrusion corresponding to the first annular groove is a first seal protrusion, and the seal protrusions corresponding to the second and third annular grooves are a second and third seal protrusion, the protrusion height of the second seal protrusion is the same as the protrusion height of the third seal protrusion and is greater than the protrusion height of the first seal protrusion, the protrusion height h1 of the first seal protrusion and the protrusion height h2 of the second seal protrusion are related to each other by h2 = h1 + a, where a is 0.4 mm. Here, the storage tank breathing valve has an interface flange inner diameter (i.e., the diameter of the storage tank breathing valve's inlet) D of 300 mm and is called storage tank breathing valve A4.

[0121] Using the VENTIL CT800-T4 storage tank breathing valve test device, the storage tank breathing valve A4 was tested with an opening pressure of 1350 Pa at the pressure end and -300 Pa at the vacuum end. The test was conducted in accordance with the standard API 2000-2014 "Venting Atmospheric and Low-pressure Storage Tanks" and ISO 28300-2008 "Petroleum, petrochemical and natural gas industries - Venting of atmospheric and low-pressure storage tanks".

[0122] As a result, the storage tank's breathing valve A4 has a leakage rate of 0.5 Nml / min at a test pressure of 1012 Pa (1350 Pa * 75%), and when the leakage rate of the storage tank's breathing valve A4 is 1 Nml / min, the test pressure is 1150 Pa, which reaches 85% of the opening pressure. The storage tank's breathing valve A4 has a leakage rate of 0.7 Nml / min at a test pressure of -225 Pa (-300 Pa * 75%), and when the leakage rate of the storage tank's breathing valve A4 is 1 Nml / min, the test pressure is -250 Pa, which reaches 83% of the opening pressure.

[0123] As can be seen from the above, the present application provides a sealing structure, a breathing valve for a storage tank, and a storage tank, in which the protruding ends of the inner ring sealing protrusion 41 and the outer ring sealing protrusion 42 press against the flexible sealing diaphragm 5, which elastically extends toward the inside of the inner ring groove 82 and the outer ring groove 83, thereby achieving a double high-performance seal in the sealing structure and significantly improving sealing performance. When used in a breathing valve for a storage tank, the sealing structure can effectively reduce the probability of leakage from the breathing valve for the storage tank. Furthermore, when the target axis of the valve disc 8 overlaps with the center axis of the valve seat 4, and there is only one inner ring groove 82, one outer ring groove 83, one inner ring seal protrusion 41, and one outer ring seal protrusion 42, the above design of the seal structure can ensure that the seal diaphragm 5 can elastically extend in both the inner ring groove 82 and the outer ring groove 83, and can ensure that the seal diaphragm 5 is always in close contact with the inner ring seal protrusion 41 and the outer ring seal protrusion 42, thereby ensuring the sealing performance of the seal structure. If there are multiple inner ring grooves 82, one outer ring groove 83, one inner ring seal protrusion 41, and one outer ring seal protrusion 42, not only will production costs increase, but it will also be difficult to ensure that the seal diaphragm 5 can elastically extend in the inner ring groove 82 when the valve disc 8 and valve seat 4 are properly fitted or eccentric, making it difficult to ensure the sealing effectiveness of the seal structure.

[0124] Furthermore, the flexible sealing diaphragm 5 includes a laminated polymer sheet layer 51 and a fluoroelastomer composite layer 52, which significantly reduces leakage from the storage tank's breathing valve. Furthermore, the sealing diaphragm 5 made of the above materials also has good durability and ductility, ensuring a long-term sealing effect for the seal structure and helping to maintain the reliability of the storage tank's breathing valve. The valve stem 10, valve stem positioning sleeve 12, and positioning ball 121 of the storage tank's breathing valve convert any force applied laterally to the valve stem 10 into a force applied vertically, thereby dispersing stiffness stress and reducing fatigue damage to the valve stem 10, which is beneficial to improving the durability of the valve stem 10 and the storage tank's breathing valve. The positioning ball 121 is advantageous in reducing the movement resistance of the valve stem 10, improving the smooth rotation of the valve stem 10 and valve disc 8, and preventing the valve stem 10 from getting stuck. It also prevents eccentric rotation of the valve disc 8. The central axes of the intake port, pressure end valve hole, and vacuum end valve hole are aligned, allowing the gas flow from the intake port to the storage tank's breathing valve to flow stably, reducing vibration of the storage tank's breathing valve. The above structural design prevents eccentric rotation of the valve disc 8.

[0125] Although the preferred embodiments of the present application have been described in detail above, the present application is not limited thereto. Within the scope of the technical concept of the present application, the technical solutions of the present application may be modified in a number of simple ways, including combining each technical feature in any other suitable manner, and these simple modifications and combinations shall also be deemed to be the contents disclosed in the present application, and all fall within the scope of protection of the present application.

[0126] In the description of this application, the terms "first" and "second" are for descriptive purposes only and cannot be understood to indicate relative importance or to imply the number of technical features shown. Thus, unless otherwise specified, a feature qualified by "first" or "second" may explicitly or implicitly include one or more of that feature. "Multiple" means two or more. The term "comprises" and any variations thereof imply an inclusive inclusion, where one or more other features, integers, steps, operations, units, components, and / or combinations thereof may be present or additional.

[0127] Furthermore, terms indicating orientations or relative positional relationships, such as "center," "lateral," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," are based on the orientations or relative positional relationships shown in the drawings and are merely used to facilitate and simplify the description of this application, and do not indicate that the devices or elements they refer to have a specific orientation or must be configured or operate in a specific orientation, and therefore cannot be understood as limiting this application.

[0128] Furthermore, unless otherwise expressly defined and limited, the terms "attach," "couple," and "connect" should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, or an integral connection. They may also refer to a mechanical connection or an electrical connection. They may also refer to a direct connection, an indirect connection via an intermediate medium, or internal communication between two elements. The specific meanings of the above terms in this application can be understood by those skilled in the art depending on the specific circumstances. [Explanation of symbols]

[0129] 1 Pressure end mounting seat 2 Valve seat fastening screws 3 Annular seal ring 4 Valve seats 5 Flexible sealing diaphragm 6 Diaphragm fixing disk 7 Valve disc fastening screw 8 valve disc 9 Buffer ring 10 Valve stem 11 Bush 12 Valve stem positioning sleeve 121 Positioning ball 13 Vacuum end mounting seat 41 Inner ring seal protrusion 42 Outer ring seal protrusion 51 polymer sheet layer 52 Fluorine rubber composite layer 81 Rotor 82 Inner ring groove 83 Outer ring groove 14 Press end cap 15 Valve stem fixing disc 16 Fastening nut 17 O seal ring 18 Pressure Chamber 19 Vacuum Chamber 20 Common Chamber 21 Piping flange 22 Vacuum fire protection panel 23 Vacuum Rain Cover 24 Fixed cross ring 25 Pressure Fireproof Panel 26 Pressure Rain Cover 27 Pressure piping flame arrester

Claims

1. A seal structure, the seal structure comprising: a valve seat (4) and a valve disc (8) that are disposed opposite each other and tightly seal against each other, wherein an inner ring groove (82) and an outer ring groove (83) surrounding the inner ring groove (82) are formed on the tight seal surface of one of the valve disc (8) and the valve seat (4), and an inner ring seal protrusion (41) aligned with the inner ring groove (82) and an outer ring seal protrusion (42) aligned with the outer ring groove (83) are formed on the other tight seal side; a flexible seal diaphragm (5) provided on the tight-fitting seal surface and covering the inner ring groove (82) and the outer ring groove (83); a seal structure characterized in that, when the valve seat (4) and the valve disc (8) are tightly sealed, at least a portion of the inner ring seal projection (41) extends into the inner ring groove (82), and at least a portion of the outer ring seal projection (42) extends into the outer ring groove (83), and the flexible seal diaphragm (5), which is pressed by the respective protruding ends of the inner ring seal projection (41) and the outer ring seal projection (42), elastically extends toward the inside of the inner ring groove (82) and the outer ring groove (83).

2. 2. The seal structure according to claim 1, wherein the inner ring groove (82), the outer ring groove (83), the inner ring seal projection (41), and the outer ring seal projection (42) are each one or a plurality of them are distributed concentrically.

3. the inner ring groove (82) and the outer ring groove (83) are recessed into the tight seal surface of the valve disc (8), the flexible seal diaphragm (5) is covered by the tight seal surface of the valve disc (8), and the inner ring seal protrusion (41) and the outer ring seal protrusion (42) are both formed on the tight seal side of the valve seat (4), 2. The sealing arrangement according to claim 1, characterized in that optionally, the flexible sealing diaphragm (5) is pressed against the tight-fitting sealing surface of the valve disc (8) by a diaphragm fixed disc (6).

4. The protruding ends of the inner ring seal projection (41) and the outer ring seal projection (42) all constitute tapered ends that press against the flexible seal diaphragm (5), and the tapered ends have tip contact surfaces that contact the flexible seal diaphragm (5) formed as arcuate surfaces; Optionally, an included angle of the tapered end ranges from 45° to 75°; 2. The seal structure according to claim 1, wherein optionally, the arc diameter of the arc surface is in the range of 0.1 mm to 0.3 mm.

5. The projection height of the outer ring seal projection (42) is greater than the projection height of the inner ring seal projection (41), 2. The seal structure according to claim 1, wherein optionally, a difference between the projection height of the outer ring seal projection (42) and the projection height of the inner ring seal projection (41) ranges from 0.1 mm to 0.8 mm.

6. The corner joints between the side walls of the inner ring groove (82), the side walls of the outer ring groove (83), and the tight-fitting sealing surface of the valve disc (8) all transition in a smooth arc; 2. The seal arrangement of claim 1, wherein optionally, the transition arc formed has a radian range of 1.1 rad to 1.2 rad.

7. The seal structure includes: a buffer ring (9) provided in the recessed groove of the outer ring groove (83), wherein the protruding end of the outer ring seal protrusion (42) presses the flexible seal diaphragm (5) toward the buffer ring (9); 2. The sealing arrangement according to claim 1, characterized in that optionally the material of said damping ring (9) is a polyurethane elastomer.

8. The flexible sealing diaphragm (5) includes a polymer sheet layer (51) and a fluororubber composite material layer (52) that are laminated together; Optionally, the fluororubber composite layer (52) is made of a raw material composition containing a fluororubber, an inorganic filler, an acid absorber, a vulcanizing agent, a release agent, and a colorant; Optionally, the polymer sheet forming the polymer sheet layer (51) is one or more selected from polyetheretherketone, polytetrafluoroethylene, and polyimide; Optionally, the thickness of said polymer sheet layer (51) is between 0.1 mm and 1 mm; Optionally, the thickness ratio of the polymer sheet layer (51) to the fluororubber composite layer (52) is in the range of 1:1 to 1:4; 8. A sealing arrangement according to any one of claims 1 to 7, characterized in that optionally, the flexible sealing diaphragm (5) is toric.

9. The seal structure according to any one of claims 1 to 7, characterized in that the valve disc (8) is a rotor valve disc that is self-rotatable by being driven by the flow of overflow gas.

10. The rotor valve disc is a disk body having both the inner ring groove (82) and the outer ring groove (83) formed on its disk surface; a rotor ring suspended downward from the periphery of the disk body and including a plurality of rotors (81) spaced apart from one another in the circumferential direction, with gap gas flow channels formed between adjacent two of the rotors (81), and the flow of the overflow gas flowing through the gap gas flow channels from the inside to the outside drives the valve disk (8) to rotate itself; Optionally, said rotor radian is between 0.3 rad and 0.4 rad; Optionally, the number of rotors is between 15 and 20; 10. The seal arrangement of claim 9, wherein optionally, the width of the interstitial gas flow channel ranges from 3 mm to 6 mm.

11. A breathing valve for a storage tank having a pressure end and a vacuum end provided therein, The breathing valve for a storage tank includes the seal structure according to any one of claims 1 to 10, and the seal structure is provided at the pressure end and / or the vacuum end.

12. 12. The breathing valve for a storage tank according to claim 11, wherein the seal structure includes a pressure end seal structure provided at the pressure end and a vacuum end seal structure provided at the vacuum end, a valve stem (10) is connected to the valve disc (8) of the seal structure, the valve stem (10) connected to the pressure end seal structure extends from the disc surface of the valve disc (8) in a direction away from the valve seat (4), and the valve stem (10) connected to the vacuum end seal structure extends from the disc surface of the valve disc (8) in a direction on the same side as the valve seat (4).

13. 13. The breathing valve for a storage tank according to claim 12, wherein at the pressure end, a pressure end mounting seat (1) extending radially inward is formed on an inner wall of the housing of the breathing valve for the storage tank, and a pressure end valve hole is circumferentially formed around the pressure end mounting seat (1); at the vacuum end, a vacuum end mounting seat (13) for mounting the vacuum end seal structure is provided inside the housing of the breathing valve for the storage tank, and a vacuum end valve hole is circumferentially formed around the vacuum end mounting seat (13); an intake port is formed at a bottom of the housing of the breathing valve for the storage tank, and central axes of the pressure end valve hole, the vacuum end valve hole, and the intake port overlap.

14. 13. The storage tank breathing valve according to claim 12, wherein a valve stem positioning sleeve (12) fitted onto the valve stem (10) of the pressure end seal structure is fixedly provided within the storage tank breathing valve at the pressure end, and a plurality of positioning balls (121) are provided between the inner peripheral wall of the valve stem positioning sleeve (12) and the outer peripheral side of the valve stem (10), the plurality of positioning balls (121) being spaced apart in the circumferential direction and stacked in the axial direction.

15. 15. The breathing valve for a storage tank according to claim 14, characterized in that a bushing (11) is fitted onto the outside of the valve stem (10), and the outer circumferential wall of the bushing (11) contacts the positioning ball (121).

16. 13. The storage tank breathing valve according to claim 12, wherein at the pressure end, a pressure end mounting seat (1) extending radially inward is formed on the inner wall of the housing of the storage tank breathing valve, the valve seat (4) of the pressure end seal structure is seated on and firmly connected to the peripheral edge of the seat body of the pressure end mounting seat (1), and an annular sealing ring (3) is provided at the contact portion between the bottom of the valve seat (4) and the peripheral edge of the seat body.

17. At the vacuum end, the storage tank's breathing valve a vacuum end mounting seat (13) provided in a housing of the breathing valve of the storage tank, used to mount the vacuum end seal structure, and having a vacuum end valve hole formed around it; a valve stem fixing disk (15) provided on the vacuum end mounting seat (13) on a side of the vacuum end seal structure that is away from the valve disk (8) and that covers the vacuum end valve hole; a valve stem positioning sleeve (12) inserted into the valve stem fixing disk (15), wherein the valve stem (10) of the vacuum end seal structure passes through the valve stem positioning sleeve (12) and is connected to the valve disk (8); 13. The breathing valve for a storage tank according to claim 12, further comprising a plurality of positioning balls (121) arranged between the inner peripheral wall of the valve stem positioning sleeve (12) and the outer peripheral side of the valve stem (10), the positioning balls (121) being spaced apart in the circumferential direction and stacked in the axial direction.

18. 18. The breathing valve for a storage tank according to claim 17, wherein the valve seat (4) of the vacuum end seal structure is seated on and firmly connected to the peripheral edge of the seat body of the vacuum end mounting seat (13), and an annular seal ring (3) is provided at the contact portion between the bottom of the valve seat (4) and the peripheral edge of the seat body.

19. The breathing valve of the storage tank is a valve stem (10) connected to the valve disc (8); a valve stem positioning sleeve (12) fixedly fitted onto the outside of the valve stem (10); 12. The breathing valve for a storage tank according to claim 11, further comprising a plurality of positioning balls (121) arranged between the inner peripheral wall of the valve stem positioning sleeve (12) and the outer peripheral side of the valve stem (10), the positioning balls (121) being spaced apart in the circumferential direction and stacked in the axial direction.

20. 12. The breathing valve for a storage tank according to claim 11, wherein the housing of the breathing valve for a storage tank has a straight cylindrical portion and a tapered portion whose diameter tapers inward from a bottom of the straight cylindrical portion, and the peripheral wall of the tapered portion is formed as an arc wall.

21. 12. The storage tank breathing valve according to claim 11, wherein a vacuum chamber (19) located at the vacuum end is formed inside the housing of the storage tank breathing valve, the storage tank breathing valve further includes a vacuum fireproof panel (22) located on one lateral side of the vacuum chamber (19) and fitted into the side wall of the housing, and the side wall of the vacuum chamber (19) away from the vacuum fireproof panel (22) is an arc wall.

22. 22. The storage tank breathing valve according to claim 21, further comprising a vacuum rain cover (23) disposed outside the vacuum fireproof panel (22) and having an arcuate shape.

23. A storage tank, 23. A storage tank comprising a storage tank breathing valve according to any one of claims 11 to 22.

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