Anti-blocking storage tank breather valve and storage tank

Abstract

The utility model discloses an anti-blocking storage tank breather valve and a storage tank, the storage tank breather valve comprises a valve body, a valve cavity in the valve body is divided into a pressure cavity communicated with a tank body of the storage tank and a vacuum cavity provided with an external communication port, and the external communication port is opened downwards; the valve disc assembly comprises a pressure valve disc assembly and a vacuum valve disc assembly which are axially arranged in the valve cavity in a spaced mode, and the vacuum cavity comprises a middle spacing cavity located between the pressure valve disc assembly and the vacuum valve disc assembly and an air inlet and outlet channel communicating with the external communicating opening and the middle spacing cavity; the fins are arranged in the air inlet and outlet channels and are distributed in a downward inclined mode. According to the storage tank breather valve, the situation of internal blockage can be effectively avoided, so that the pressure valve disc assembly of the storage tank breather valve can normally exhale and inhale, and the operation safety of a storage tank can be further improved.

Description

Technical Field

[0001] This application belongs to the technical field of storage tank safety equipment, and specifically relates to a clogging-proof storage tank breather valve and a storage tank. Background Art

[0002] The storage tank breather valve is an essential accessory in a storage tank, which can effectively prevent the storage tank from overpressure and negative pressure collapse, and balance the overpressure and vacuum caused by the inlet and outlet of the medium in the tank and the transfer. When the existing storage tank breather valve is in a sandstorm or rain and snow environment, if the external sandstorm or rain and snow is large, the gas mixed with external sandstorm or rain and snow can easily enter the interior of the storage tank breather valve, making it easier for the external sandstorm or rain and snow to accumulate on the pressure valve disc seat. The above situation can easily cause the pressure valve disc to fail to jump normally, and then lead to the abnormal operation of the storage tank breather valve, unable to ensure the safe operation of the storage tank breather valve and / or the storage tank, bringing great potential safety hazards. Summary of the Utility Model

[0003] The purpose of this application is to provide a clogging-proof storage tank breather valve and a storage tank, which have the advantage of further improving the safety of the storage tank operation.

[0004] To achieve the above purpose, the first aspect of this application provides a clogging-proof storage tank breather valve, which includes:

[0005] A valve body, the valve cavity inside the valve body is divided into a pressure cavity communicating with the tank body of the storage tank and a vacuum cavity provided with an external communication port, and the opening of the external communication port faces downward;

[0006] A valve disc assembly, including a pressure valve disc assembly and a vacuum valve disc assembly arranged axially spaced from each other in the valve cavity. The vacuum cavity includes an intermediate interval cavity between the pressure valve disc assembly and the vacuum valve disc assembly and an air inlet and outlet passage communicating the external communication port with the intermediate interval cavity;

[0007] Fins, which are arranged in the air inlet and outlet passage and are distributed obliquely downward.

[0008] In the embodiment of this application, the cross-section of the fin is linear or arc-shaped.

[0009] In the embodiment of this application, the cross-section of the fin is arc-shaped, and the included angle range between the two circumferential side end faces of the fin is 50° - 70°.

[0010] In the embodiment of this application, the included angle range between the tangent line at the midpoint of the fin and the vertical plane is 40° - 50°.

[0011] In the embodiment of this application, the number of fins is multiple, and the multiple fins are axially spaced in the air inlet and outlet passage along the valve body.

[0012] In an embodiment of the present application, an external communication port is formed at the bottom end of the valve cavity with the opening facing downward. In the radial direction of the valve body, the air inlet and outlet flow passage is adjacent to the intermediate spacing cavity.

[0013] In an embodiment of the present application, a storage tank communication port is further formed at the bottom end of the valve cavity. The pressure chamber includes an end cover cavity between the top wall of the valve body and the vacuum valve disc assembly, and an air inlet communication flow passage connecting the storage tank communication port and the end cover cavity. The air inlet communication flow passage and the air inlet and outlet flow passage are respectively arranged on two radial sides of the valve cavity.

[0014] In an embodiment of the present application, the storage tank breather valve further includes:

[0015] A connection seat, which is docked with the storage tank communication port and is formed with a storage tank connection passage for connecting the tank body;

[0016] Wherein, the pressure chamber further includes an intermediate connection cavity formed between the connection seat and the pressure valve disc assembly, and the storage tank connection passage, the intermediate connection cavity, the air inlet communication flow passage and the end cover cavity are connected in sequence.

[0017] In an embodiment of the present application, the central axis of the intermediate spacing cavity, the central axis of the intermediate connection cavity and the central axis of the storage tank connection passage coincide.

[0018] The second aspect of the present application provides a storage tank, which includes the anti-blocking storage tank breather valve described above.

[0019] It can be seen from the above technical solutions that the storage tank breather valve includes a valve body and a valve disc assembly. The valve cavity inside the valve body is divided into a pressure chamber communicating with the tank body of the storage tank and a vacuum chamber provided with an external communication port, and the opening of the external communication port faces downward; the valve disc assembly includes a pressure valve disc assembly and a vacuum valve disc assembly arranged axially spaced from each other in the valve cavity. The vacuum chamber includes an intermediate spacing cavity between the pressure valve disc assembly and the vacuum valve disc assembly and an air inlet and outlet flow passage connecting the external communication port and the intermediate spacing cavity; fins are arranged in the air inlet and outlet flow passage and are distributed obliquely downward. Since the external communication port is formed at the bottom end of the valve body and fins are provided in the air inlet and outlet flow passage in this embodiment, the setting of the fins can both increase the difficulty of the first gas entering the air inlet and outlet flow passage and the intermediate spacing cavity from the outside, that is, it can block the rain, snow or sand carried in the first gas during the inhalation process of the storage tank breather valve, which is beneficial to reducing the amount of rain, snow or sand entering the inside of the storage tank breather valve, and further can alleviate or avoid the situation of rain, snow and sand blocking the inside of the storage tank breather valve, improving the working reliability and use safety of the storage tank breather valve, and further ensuring the normal operation of the storage tank equipped with the storage tank breather valve.

[0020] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent specific embodiment part. Description of the Drawings

[0021] The accompanying drawings are used to provide a further understanding of the embodiments of the present application, and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present application, but do not constitute a limitation to the embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings. In the drawings:

[0022] Figure 1 It is the first sectional view of the storage tank breather valve in the embodiment of the present utility model;

[0023] Figure 2 It is the overall structure diagram of the storage tank breather valve in the embodiment of the present utility model;

[0024] Figure 3 It is the first perspective sectional view of the valve body in the embodiment of the present utility model;

[0025] Figure 4 It is the second perspective sectional view of the valve body in the embodiment of the present utility model;

[0026] Figure 5 It is the third perspective sectional view of the valve body in the embodiment of the present utility model;

[0027] Figure 6 It is the fourth perspective sectional view of the valve body in the embodiment of the present utility model;

[0028] Figure 7 It is the first perspective structural view of the valve body in the embodiment of the present utility model;

[0029] Figure 8 It is the second perspective structural view of the valve body in the embodiment of the present utility model;

[0030] Figure 9 It is the second sectional view of the storage tank breather valve in the embodiment of the present utility model;

[0031] Figure 10 is Figure 9 the partial enlarged view at A in;

[0032] Figure 11 is Figure 9 the partial enlarged view at B in;

[0033] Figure 12 It is the structural diagram of the sealing structure on the pressure valve disc assembly in the embodiment of the present utility model;

[0034] Figure 13 It is the structural diagram of the sealing structure on the vacuum valve disc assembly in the embodiment of the present utility model.

[0035] Explanation of reference numerals

[0036] 1 Valve body 101 Pressure chamber

[0037] 102 Vacuum chamber 103 Storage tank connection port

[0038] 104 External connection port 105 Intermediate spacer chamber

[0039] 106 Inlet and outlet air flow path 107 End cap chamber

[0040] 108 Inlet connection flow path 109 Storage tank connection channel

[0041] 110 Intermediate connection chamber 111 End cap part

[0042] 112 Cylindrical part 113 Vacuum valve guide rod sleeve

[0043] 2 Pressure valve disc assembly 201 Valve seat

[0044] 202 Valve disc 203 First guide arc surface

[0045] 204 Second guide arc surface 205 Guide inclined surface

[0046] 206 Pressure end valve hole 3 Vacuum valve disc assembly

[0047] 301 Vacuum end valve hole 4 Connection seat

[0048] 5 First partition 6 Second partition

[0049] 7 Third partition 8 First circular arc plate

[0050] 801 First side opening 9 Second circular arc plate

[0051] 901 Second side opening 10 Connection cylinder

[0052] 11 Fourth partition 12 Fins

[0053] 13 Flame arrestor disc 14 Heat insulation pad

[0054] 15 Sealing structure 1501 Annular sealing protrusion

[0055] 1502 Annular groove 1503 Flexible sealing diaphragm

[0056] 16 Vacuum valve guide rod 17 Pressure valve guide rod sleeve

[0057] 18 Pressure valve guide rod 19 One - word positioning plate Detailed implementation method

[0058] The following will describe in detail the specific embodiments of the present application with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustrating and explaining the present application, and are not used to limit the present application.

[0059] In an embodiment of the present application, a clogging - proof storage tank breather valve is provided. The storage tank breather valve includes:

[0060] A valve body 1, in which a valve cavity inside the valve body 1 is partitioned into a pressure chamber 101 communicating with the tank body of the storage tank and a vacuum chamber 102 provided with an external communication port 104, and the opening of the external communication port 104 faces downward;

[0061] A valve disc assembly, including a pressure valve disc assembly 2 and a vacuum valve disc assembly 3 axially spaced from each other in the valve cavity. The vacuum chamber 102 includes an intermediate spacer chamber 105 between the pressure valve disc assembly 2 and the vacuum valve disc assembly 3 and an air inlet - outlet passage 106 communicating the external communication port 104 with the intermediate spacer chamber 105;

[0062] Fins 12, arranged in the air inlet - outlet passage 106 and distributed obliquely downward.

[0063] Specifically, in this embodiment, the valve body 1 includes a cylindrical portion, a horizontal connection portion, and a vertical connection portion. The horizontal connection portion is disposed on the peripheral wall of the cylindrical portion and is distributed in the horizontal direction. The vertical connection portion is distributed in the vertical direction and its top is connected to the horizontal connection portion. The cavities inside the cylindrical portion, the cavities inside the horizontal connection portion, and the cavities inside the vertical connection portion together form a valve cavity. The pressure chamber 101 and the intermediate spacer chamber 105 are both formed inside the cylindrical portion. The air inlet and outlet passage 106 is distributed in the vertical direction and is formed inside the vertical connection portion and is located outside the intermediate spacer chamber 105. The external communication port 104 is formed at the bottom of the vertical connection portion. When the tank breather valve is applied to an environment with strong wind, sand, rain, or snow, during the inhalation process of the tank breather valve, the external first gas enters the cavity in the horizontal connection portion of the air inlet and outlet passage 106 through the external communication port 104, and then enters the intermediate spacer chamber 105 from the cavity in the horizontal connection portion. If the pressure in the intermediate spacer chamber 105 is greater than the pressure in the pressure chamber 101 (i.e., when the internal pressure of the tank body is lower than the inhalation pressure), the vacuum valve disc assembly 3 will experience a lifting phenomenon. At this time, the external first gas then enters the pressure chamber 101 and the tank body of the storage tank from the intermediate spacer chamber 105. Since the opening of the external communication port 104 in this embodiment faces downward and the air inlet and outlet passage 106 is distributed in the vertical direction, the external first gas (which may contain rain, snow, or sand particles) has to move upward from bottom to enter the air inlet and outlet passage 106 after passing through the external communication port 104 (during this process, the external force acting on the first gas decreases, and some rain, snow, or sand particles may fall under the action of gravity and drop outside the tank breather valve), move upward to the top of the air inlet and outlet passage 106, change the flow direction, and then enter the cavity in the horizontal connection portion and the intermediate spacer chamber 105 between the pressure valve disc assembly 2 and the vacuum valve disc assembly 3. Compared with rain, snow, or sand particles directly entering the inside of the tank breather valve from the top or the lateral side of the valve body 1, the tank breather valve in this embodiment increases the difficulty of the first gas containing rain, snow, or sand particles entering the pressure chamber 101 from the outside, and can avoid blockage inside the tank breather valve. In addition, the setting of the fins 12 can not only increase the difficulty of the first gas entering the air inlet and outlet passage 106 and the intermediate spacer chamber 105 from the outside, that is, it can block the rain, snow, or sand carried in the first gas during the inhalation process of the tank breather valve, improve the difficulty of the rain, snow, or sand carried in the first gas moving to the intermediate spacer chamber 105, and is beneficial to reducing the amount of rain, snow, or sand entering the inside of the tank breather valve, and further can alleviate or avoid the situation of rain, snow, and sand blocking the inside of the tank breather valve.

[0064] When the tank breather valve in this embodiment needs to exhale (i.e., the internal pressure of the tank body exceeds the exhalation pressure), the pressure valve disc assembly 2 experiences a lifting phenomenon. The gas in the pressure chamber 101 enters the intermediate spacer chamber 105, and then flows to the outside through the cavity in the horizontal connection portion and the air inlet and outlet passage 106.

[0065] In another embodiment of the present invention, as Figures 1-9 shown, the external communication port 104 is formed at the bottom end of the valve cavity with the opening facing downward. In the radial direction of the valve body 1, the air inlet and outlet passage 106 is adjacent to the intermediate spacer cavity 105.

[0066] Specifically, the first gas from the outside (which may contain rain, snow or sand grains) needs to move upward from the bottom after passing through the external communication port 104 and enter the air inlet and outlet passage 106 (during this process, the external force on the first gas decreases, and some rain, snow or sand grains may fall under the action of gravity and drop outside the storage tank breather valve), then move upward to the top of the air inlet and outlet passage 106, change the flow direction and enter the intermediate spacer cavity 105 between the pressure valve disc assembly 2 and the vacuum valve disc assembly 3; when the storage tank breather valve needs to exhale (that is, the internal pressure of the tank exceeds the exhalation pressure), the pressure valve disc assembly 2 jumps up, and the gas in the pressure cavity 101 enters the intermediate spacer cavity 105 and then flows to the outside through the air inlet and outlet passage 106. This setting can not only avoid blockage inside the storage tank breather valve, but also make the layout inside the valve body 1 more compact, which is beneficial to reducing the overall volume of the storage tank breather valve and realizing the miniaturized design of the storage tank breather valve.

[0067] Furthermore, the fin 12 can also guide the gas when it flows out of the storage tank breather valve, so that the second gas exhaled from the storage tank breather valve can flow out quickly (that is, this kind of fin 12 setting can make the resistance when the second gas in the storage tank is discharged much smaller than the resistance when the first gas is inhaled, so as to meet the best flow channel design); in addition, when the storage tank breather valve exhales, the first gas in the intermediate spacer cavity 105 meets the exhaled second gas and generates condensed water, and the setting of the fin 12 can quickly lead the condensed water flowing out to the air inlet and outlet passage 106 to the outside of the storage tank breather valve.

[0068] In an embodiment of the present application, the cross-section of the fin 12 is linear or arc-shaped. The fins 12 with the above two cross-sectional shapes can not only block the entry of the external first gas into the interior of the storage tank breather valve and quickly lead the second gas or condensed water exhaled from the storage tank breather valve out of the storage tank breather valve, but also have the advantages of simple structure, convenient production and manufacturing, and can reduce the production difficulty and cost of the breather valve.

[0069] In an embodiment of the present application, the cross-section of the fin 12 is arc-shaped, and the included angle range between the two circumferential side end faces of the fin 12 is 50° - 70°. Further, in this embodiment, the included angle between the two circumferential side end faces of the fin 12 is preferably 60°. This value can not only make the fin 12 have a wide enough gas blocking surface (that is, the bottom surface of the fin 12), but also enable the fin 12 to smoothly guide the second gas and / or condensed water exhaled from the storage tank breather valve, and can also avoid wasting the production material of the fin 12, which is beneficial to reducing the production cost of the storage tank breather valve.

[0070] In an embodiment of the present application, the range of the angle between the tangent line at the middle position point of the fin 12 and the vertical plane is 40° - 50°. In this embodiment, the middle position point of the fin 12 refers to the middle position point of the fin 12 in the width direction. Further, the angle between the tangent line at the middle position point of the fin 12 and the vertical plane is preferably 45°. Such a setting can enable the fin 12 to have the best layout form, enabling the fin 12 to have the best blocking effect on the first gas moving upward, and at the same time, enabling it to have the best guiding effect on the second gas and condensate moving downward.

[0071] In an embodiment of the present application, the number of fins 12 is multiple (such as 2), and the multiple fins 12 are spaced along the axial direction of the valve body 1 in the air inlet and outlet flow channel 106. Specifically, two adjacent fins 12 are staggered in the vertical direction. The above structure is conducive to fully meeting the ventilation volume requirements of the storage tank breather valve. In addition, by arranging the multiple fins 12 at intervals in the vertically distributed air inlet and outlet flow channel 106, the upward movement power of rain, snow or sand is reduced (compared with the outside, the first gas entering the air inlet and outlet flow channel 106 is less, so the upward movement power of the rain, snow or sand mixed in the first gas is reduced). Since the gravity of the above rain, snow or sand remains unchanged, the difficulty of the rain, snow or sand mixed in the first gas moving upward increases. In addition, the probability of the rain, snow or sand colliding with the fins 12 and falling after entering the air inlet and outlet flow channel 106 and separating from the first gas is increased, further increasing the difficulty of the rain, snow or sand mixed in the first gas moving into the middle interval cavity 105, which is conducive to reducing the amount of rain, snow or sand entering the inside of the storage tank breather valve, and further can alleviate or avoid the situation of rain, snow and sand blocking the inside of the storage tank breather valve. Further, in this embodiment, the thickness of the fin 12 is 5 mm, so that the fin 12 has sufficient structural strength.

[0072] In an embodiment of the present application, a storage tank connection port 103 is further formed at the bottom end of the valve cavity (the opening of the storage tank connection port 103 faces downward). The pressure chamber 101 includes an end cap chamber 107 between the top wall of the valve body 1 and the vacuum valve disc assembly 3 and an intake connection flow channel 108 connecting the storage tank connection port 103 and the end cap chamber 107. The intake connection flow channel 108 and the air inlet and outlet flow channel 106 are respectively arranged on the radial two sides of the valve cavity.

[0073] Specifically, the temperature of the storage medium inside the tank body is 3°C to 5°C higher than its freezing point. When the storage tank breather valve in this embodiment is in a cold working environment (such as -20°C to -50°C), the first gas from the outside is cold air, and the second gas exhaled by the storage tank breather valve is hot air. After the vacuum valve disc assembly 3 jumps up, the first gas from the outside enters the end cover cavity 107 and the intake connection flow channel 108 from the intermediate interval cavity 105, and then enters the tank body of the storage tank from the intake connection flow channel 108 and the storage tank connection port 103. Since the storage tank connection port 103 in this embodiment is formed at the bottom end of the valve cavity, and the end cover cavity 107 is at the top end of the valve cavity, it shows that the first gas entering the pressure cavity 101 has to vertically pass through the entire valve cavity to enter the tank body. And because the inlet and outlet air flow channels 106 and the intake connection flow channel 108 are respectively on the two radial sides of the valve cavity, the first gas has to bypass from one radial side of the cylindrical part 112 to the other radial side when entering the tank body from the outside, with a long passing path and the need to change the flow direction multiple times, which further greatly increases the difficulty of the first gas entering the tank body from the outside. This is beneficial to making the first gas entering the tank body more gentle, and then making the pressure valve disc assembly 2 less likely to jump up, reducing the probability of water vapor generated by the encounter of the first gas and the second gas and condensing on the pressure valve disc assembly 2, and further improving the working reliability and use safety of the storage tank breather valve.

[0074] Furthermore, although multiple chambers are provided inside the storage tank breather valve in this embodiment to increase the difficulty of the first gas entering the tank body, by increasing the flow area of the gas inside the storage tank breather valve (such as increasing the radial width of the inlet and outlet air flow channels 106 and the intake connection flow channel 108), the ventilation volume of the storage tank breather valve can still meet the API2000 standard (or ISO28300 standard).

[0075] In an embodiment of the present application, the storage tank breather valve further includes:

[0076] A connection seat 4, which is docked with the storage tank connection port 103 and is formed with a storage tank connection channel 109 for connecting the tank body;

[0077] Wherein, the pressure cavity 101 further includes the storage tank connection channel 109 and an intermediate connection cavity 110 formed between the connection seat 4 and the pressure valve disc assembly 2. The storage tank connection channel 109, the intermediate connection cavity 110, the intake connection flow channel 108 and the end cover cavity 107 are sequentially connected. Among them, the storage tank connection channel 109, the intermediate connection cavity 110, the intermediate interval cavity 105 and the end cover cavity 107 are sequentially distributed along the axial direction from the first axial end to the second axial end.

[0078] Specifically, the upper end of the connecting seat 4 is connected to the valve body 1 by a bolt or a snap-fit structure, the tank connecting port 103 is formed at the bottom end of the intermediate connecting cavity 110, and the tank connecting channel 109 is connected to the intermediate connecting cavity 110 at one end away from the tank body. In the starting state of the vacuum valve disc assembly 3, the external first gas first enters the end cover cavity 107 from the intermediate partition cavity 105, and then enters the tank body after passing through the air intake connecting channel 108, the intermediate connecting cavity 110 and the tank connecting channel 109. The above-mentioned arrangement extends the flow path of the first gas entering the tank body, improves the smoothness of the flow of the first gas, allows the first gas to enter the tank body more smoothly, reduces the disturbance of the gas in the tank body, and thereby makes the breathing of the tank breathing valve more stable, which is beneficial to further ensure the reliability of the use of the tank breathing valve.

[0079] In one embodiment of the present application, Figures 1-2 As shown, the valve body 1 includes a hollow cylindrical portion 112 and an end cover portion 111, the intermediate partition cavity 105, the inlet and outlet flow channels 106, the intake connecting flow channel 108 and the intermediate connecting cavity 110 are all formed inside the cylindrical portion 112, and the end cover portion 111 covers the axial end of the cylindrical portion 112 and forms an end cover cavity 107.

[0080] Specifically, the end cover cavity 107 is formed by being recessed upward from the bottom surface of the end cover portion 111, and the end cover portion 111 is matched with the top of the barrel portion 112 by bolts or a snap-fit structure. Preferably, the end cover portion 111 is fixed to the barrel portion 112 by a snap-fit structure so that the two form a stable and good match; further, the corner connection between the top wall of the end cover cavity 107 and the peripheral wall of the end cover cavity 107 is formed as a smooth arc transition, and the radius of the arc here is in the range of 0.1R 端盖部 ~0.15R 端盖部 , that is, the radius of the arc can be 0.1R 端盖部 , 0.125R 端盖部 , 0.135R 端盖部 , 0.15R 端盖部 etc.; preferably, the radius of the arc is 0.125R 端盖部 , where R 端盖部 is the radius of the end cover portion 111 . This arrangement can not only improve the stress concentration of the end cover portion 111 and the breathing valve of the storage tank, but also optimize the fluidity of the gas in the end cover cavity 107 .

[0081] In one embodiment of the present application, Figure 1 and Figures 3-7 As shown, the tank breathing valve also includes:

[0082] The partition assembly is used to separate the valve cavity into various chambers. In this embodiment, each chamber includes an intermediate partition cavity 105, an intermediate connecting cavity 110, an inlet and outlet flow channel 106 and an air intake connecting flow channel 108.

[0083] Specifically, the partition assembly includes:

[0084] The first arc plate 8 is arranged between the pressure valve disc assembly 2 and the vacuum valve disc assembly 3 and is used to cooperate with the pressure valve disc assembly 2 and the vacuum valve disc assembly 3 to divide and form an intermediate interval cavity 105 in the valve cavity;

[0085] The second arc plate 9 is arranged below the pressure valve disc assembly 2. In the horizontal plane, the second arc plate 9 is arranged opposite to the first arc plate 8;

[0086] The connecting cylinder 10 is arranged between the second arc plate 9 and the connecting seat 4. The pressure valve disc assembly 2, the second arc plate 9 and the connecting cylinder 10 cooperate to divide and form an intermediate connecting cavity 110 in the valve cavity;

[0087] The first partition 5, one side of the first partition 5 is connected to the outer peripheral edge of the vacuum valve disc assembly 3, and the other side of the first partition 5 is connected to the inner peripheral wall of the cylindrical body part 112;

[0088] The second partition 6 is arranged on the first end side of the first partition 5;

[0089] The third partition 7 is arranged on the second end side of the first partition 5. The first partition 5, the second partition 6, the third partition 7, the second arc plate 9 and the connecting cylinder 10 cooperate to divide and form an air inlet and outlet channel 106 in the valve cavity;

[0090] The fourth partition 11 is arranged above the connecting cylinder 10. One side of the fourth partition 11 is connected to the side of the connecting cylinder 10 away from the second arc plate 9, and the other side of the fourth partition 11 is connected to the inner peripheral wall of the cylindrical body part 112, and is used to cooperate with the second partition 6, the third partition 7 and the first arc plate 8 to divide and form an air inlet connecting channel 108 in the valve cavity.

[0091] In this embodiment, both the first partition 5 and the fourth partition 11 are arranged horizontally and are arc-shaped. The first partition 5 and the fourth partition 11 are respectively on the radial two sides of the connecting cylinder 10. The second partition 6, the third partition 7, the first arc plate 8 and the second arc plate 9 are all arranged vertically. The vertical two ends of the second partition 6 are respectively connected to the first end side of the first partition 5 and the first end side of the fourth partition 11. The vertical two ends of the third partition 7 are respectively connected to the second end side of the first partition 5 and the second end side of the fourth partition 11; A first side opening 801 communicating the air inlet and outlet channel 106 and the intermediate interval cavity 105 is formed between the circumferential two ends of the first arc plate 8, and a second side opening 901 communicating the air inlet connecting channel 108 and the intermediate connecting cavity 110 is formed between the circumferential two ends of the second arc plate 9.

[0092] Furthermore, an arc transition is adopted between the inner peripheral wall of the cylindrical body portion 112, the outer side wall of the second arc plate 9, the outer side wall of the connecting cylinder 10 and the fins 12, which is beneficial to improving the flow smoothness of the gas in the inlet and outlet air flow channels 106.

[0093] In an embodiment of the present application, a hydrophobic coating is provided on the inner cavity wall of the vacuum cavity 102.

[0094] Specifically, the inner cavity wall of the vacuum cavity 102 includes the bottom wall of the first partition plate 5, the inner side wall of the cylindrical body portion 112, the inner side wall of the first arc plate 8, the outer side wall of the second arc plate 9 and the outer peripheral wall of the connecting cylinder 10. The hydrophobic coating in this embodiment can be selected as a methyl silicone coating (or other superhydrophobic material coatings). Since methyl silicone has high weather resistance, waterproof, moisture-proof and chemical-resistant stability, and the coating is transparent, hard, wear-resistant, heat-resistant and has excellent water repellency.

[0095] In an embodiment of the present application, the central axis of the intermediate spacer cavity 105, the central axis of the intermediate connection cavity 110 and the central axis of the storage tank connection channel 109 coincide.

[0096] Specifically, an interface flange portion for connecting the tank body is formed at the bottom of the connecting seat 4. A storage tank communication port 103 for allowing air flow to enter the interior of the storage tank breather valve is provided on the interface flange portion. The selection of the storage tank breather valve model is related to the volume of the tank body and the breathing gas volume per unit time. In this embodiment, the diameter of the interface flange portion is the size of the storage tank breather valve model. The above setting can make the flow field inside the valve body 1 more evenly distributed, which is beneficial to reducing the tremor situation of the storage tank breather valve.

[0097] In an embodiment of the present application, the storage tank breather valve further includes a flame arrester disk 13, and the flame arrester disk 13 is arranged in the storage tank connection channel 109.

[0098] Specifically, when non-oily substances are stored in the tank body, the flame arrester disk 13 is arranged in the flame arrester disk installation groove. When the storage tank breather valve in this embodiment is applied in a cold environment (such as in winter in northern China, where the temperature can reach -20°C and the night temperature can even reach -40°C), the above setting can facilitate the storage tank breather valve to use the storage medium in the tank body (the storage substance has a relatively high temperature) to heat the flame arrester disk 13, which can effectively prevent the flame arrester disk 13 from freezing.

[0099] In an embodiment of the present application, the thickness range of the flame arrester disc 13 is 3 mm to 5 mm. The above numerical range will not make the flame arrester disc 13 too thick to affect the ventilation volume of the flame arrester disc 13. The thickness of the flame arrester disc 13 can be selected as 3 mm, 4 mm or 5 mm, and specifically can be determined according to the ventilation volume of the storage tank breather valve to be satisfied; further, the flame arrester disc 13 is preferably a metal mesh type flame arrester disc, and the number of mesh holes of the metal mesh of the flame arrester layer of the metal mesh type flame arrester disc ranges from 16 meshes to 22 meshes.

[0100] In another embodiment of the present application, in this embodiment, the valve body 1 and the connecting seat 4 are integrally cast, and the combined body of the valve body 1 and the connecting seat 4 is made of stainless steel.

[0101] In an embodiment of the present application, the storage tank breather valve further includes a heat preservation pad 14 provided on the outer peripheral side of the cylinder part 112. Among them, the heat preservation pad 14 can be selected as a sponge pad, which can effectively ensure the temperature inside the storage tank breather valve and prevent condensed water from condensing on the pressure valve disc assembly 2.

[0102] In an embodiment of the present application, as Figures 10-13 shown, sealing structures 15 are formed on both the pressure valve disc assembly 2 and the vacuum valve disc assembly 3. The number of sealing structures 15 on the vacuum valve disc assembly 3 is greater than the number of sealing structures 15 on the pressure valve disc assembly 2 (for example, the number of sealing structures 15 on the vacuum valve disc assembly 3 is 2 groups, 3 groups, 4 groups or other numbers, and the number of sealing structures 15 on the pressure valve disc assembly 2 corresponds to 1 group, 2 groups, 3 groups or other numbers). Among them, both the pressure valve disc assembly 2 and the vacuum valve disc assembly 3 include a valve seat 201 and a valve disc 202 located above the valve seat 201. The sealing structure 15 includes:

[0103] An annular sealing protrusion 1501 formed on the top of the valve seat 201;

[0104] An annular groove 1502 formed on the valve disc and opposite to the annular sealing protrusion 1501 up and down;

[0105] A flexible sealing diaphragm 1503 provided on the valve disc and covering the annular groove 1502. In the state where the valve seat 201 and the valve disc are in a fitting and sealing state, the annular sealing protrusion 1501 at least partially extends into the annular groove 1502, and the flexible sealing diaphragm 1503 pushed by the protruding end of the annular sealing protrusion 1501 elastically extends towards the inside of the annular groove 1502.

[0106] Specifically, the opening of the annular groove 1502 faces downward. A fitting sealing surface is formed on the valve disc 202. The flexible sealing diaphragm 1503 is arranged on the bottom wall of the valve disc 202 and simultaneously covers the opening of the annular groove 1502. When the valve disc 202 approaches the valve seat 201 downward, the annular sealing projection 1501 on the valve seat 201 can at least partially extend upward into the annular groove 1502. At this time, the annular sealing projection 1501 and the flexible sealing diaphragm 1503 form a sealing structure 15. Further, since the intermediate spacer cavity 105 communicates with the outside, the outside first gas easily enters the inside of the storage tank breather valve during the inhalation process of the storage tank breather valve, and no condensed water will be generated on the vacuum valve disc assembly 3. Therefore, in this embodiment, two sets of sealing structures 15 are provided on the vacuum valve disc assembly 3 to ensure that the storage tank breather valve has sufficient sealing performance (in this embodiment, the flexible sealing diaphragms 1503 of the two sets of sealing structures 15 are integrally formed); during the exhalation process of the storage tank breather valve, the second gas exhaled from the tank body and the first gas from the outside are likely to generate condensed water when they meet (the condensed water is likely to freeze after the temperature drops). If multiple sets of sealing structures 15 are provided on the pressure valve disc assembly 2, it is easier for the pressure valve disc assembly 2 to accumulate water and cause icing. Therefore, only one set of sealing structure 15 can be provided on the pressure valve disc assembly 2 in this embodiment.

[0107] In this embodiment, the setting of the sealing structure 15 can not only ensure the sealing performance of the storage tank breather valve, effectively reduce the probability of leakage of the storage tank breather valve, but also further reduce the possibility of icing and frosting on the pressure valve disc assembly 2, further improving the safety performance and environmental protection performance of the storage tank breather valve, which is beneficial to ensuring personal safety and property safety.

[0108] Further, the height range of the valve seat 201 of the pressure valve disc assembly 2 can be 25 mm to 35 mm. Preferably, the height of the valve seat 201 of the pressure valve disc assembly 2 is 30 mm to ensure that the valve seat 201 of the pressure valve disc assembly 2 has sufficient strength.

[0109] The height range of the annular sealing projection 1501 of the sealing structure 15 is 3 mm to 3.4 mm. For example, the height of the annular sealing projection 1501 of the sealing structure 15 is 3 mm, 3.1 mm, 3.2 mm or 3.4 mm; the inner angle of the annular sealing projection 1501 of the sealing structure 15 can be 45° - 80°. Preferably, the height of the annular sealing projection 1501 of the sealing structure 15 is 3.2 mm, and the inner angle of the annular sealing projection 1501 of the sealing structure 15 is 60°.

[0110] Further, the flexible sealing diaphragm 1503 is a perfluoroethylene propylene copolymer component, that is, the flexible sealing diaphragm 1503 in the sealing structure 15 is made of perfluoroethylene propylene copolymer material (FEP). The thickness range of the flexible sealing diaphragm 1503 is 0.5 mm to 3 mm. For example, the thickness of the flexible sealing diaphragm 1503 is 0.5 mm, 1 mm, 1.5 mm, 2 mm or 3 mm. Preferably, in this embodiment, the thickness of the flexible sealing diaphragm 1503 is 1.5 mm, so that the flexible sealing diaphragm 1503 has a certain hardness.

[0111] In another embodiment of the present application, the flexible sealing diaphragm 1503 is a composite component of a perfluoroethylene propylene copolymer sheet layer and a vinylidene fluoride ether rubber layer. The above flexible sealing diaphragm 1503 can be obtained by bonding the perfluoroethylene propylene copolymer sheet layer and the vinylidene fluoride ether rubber layer, and then subjecting the bond of the perfluoroethylene propylene copolymer sheet layer and the vinylidene fluoride ether rubber layer to vacuum pressing.

[0112] The flexible sealing diaphragm 1503 prepared by the above method can delay the freezing time, reduce the adhesion strength of the ice layer in the storage tank breather valve, so that the storage tank breather valve can be normally opened in a low-temperature environment. At the same time, the flexible sealing diaphragm 1503 can also maintain good elasticity in the leakage interval of the storage tank breather valve from above 0.85 times the opening pressure to below the opening pressure (that is, the multiple range is 0.85 times - 1 times the opening pressure), thereby reducing the leakage amount of the storage tank breather valve. Perfluoroethylene propylene copolymer and vinylidene fluoride ether rubber can be commercially obtained.

[0113] Further, in the pressure valve disc assembly 2, the range of the difference between the radius of the valve disc 202 and the radius of the valve seat 201 is 20 mm to 30 mm. For example, the difference between the radius of the valve disc 202 and the radius of the valve seat 201 is 20 mm, 22 mm, 25 mm, 27 mm or 30 mm. Preferably, in this embodiment, the difference between the radius of the valve disc 202 and the radius of the valve seat 201 is 25 mm.

[0114] Further, the range of the difference between the radius of the valve seat 201 of the vacuum valve disc assembly 3 and the radius of the valve disc 202 of the pressure valve disc assembly 2 is 10 mm to 20 mm. For example, the difference between the radius of the valve seat 201 of the vacuum valve disc assembly 3 and the radius of the valve disc 202 of the pressure valve disc assembly 2 is 10 mm, 12 mm, 15 mm, 17 mm or 20 mm. Preferably, the difference here is 15 mm, which is convenient for installing and overhauling the valve disc 202 of the pressure valve disc assembly 2 by removing the end cover part 111.

[0115] Further, in the vacuum valve disc assembly 3, the height of the valve seat 201 ranges from 25 mm to 35 mm. For example, the height of the valve seat 201 is 25 mm, 27 mm, 30 mm, 32 mm, or 35 mm. Preferably, the height of the valve seat 201 is 30 mm to ensure that the valve seat 201 of the vacuum valve disc assembly 3 has sufficient strength. The height of the annular sealing protrusion 1501 ranges from 3 mm to 3.4 mm. For example, the height of the annular sealing protrusion 1501 is 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, or 3.4 mm. Preferably, the height of the annular sealing protrusion 1501 is 3.2 mm, and the inner angle of the annular sealing protrusion 1501 is 60°. In addition, the distance between the two sealing structures 15 on the vacuum valve disc assembly 3 is 8 mm.

[0116] Further, the inner diameter of the cylinder part 112 is determined according to the radius of the valve seat 201 of the vacuum valve disc assembly 3. The difference range between the inner diameter of the cylinder part 112 and the radius of the valve seat 201 of the vacuum valve disc assembly 3 is 15 mm to 25 mm. For example, the difference between the inner diameter of the cylinder part 112 and the radius of the valve seat 201 of the vacuum valve disc assembly 3 is 15 mm, 17 mm, 20 mm, 22 mm, or 25 mm. Preferably, the difference here is preferably 20 mm.

[0117] Further, the thickness ranges of the first arc plate 8, the second arc plate 9, and the connecting cylinder 10 are all 4 mm to 6 mm. For example, the thicknesses of the first arc plate 8, the second arc plate 9, and the connecting cylinder 10 are all 4 mm, 4.5 mm, 5 mm, or 6 mm. Preferably, the above thicknesses are all 5 mm to balance the processing cost of the storage tank breather valve and the structure and strength of the storage tank breather valve.

[0118] Further, in the vacuum valve disc assembly 3, the difference range between the radius of the valve disc and the radius of the valve seat 201 is 20 mm to 30 mm. For example, the difference between the radius of the valve disc and the radius of the valve seat 201 is 20 mm, 22 mm, 25 mm, 27 mm, or 30 mm. Preferably, in this embodiment, the difference between the radius of the valve disc and the radius of the valve seat 201 is 25 mm.

[0119] In an embodiment of the present application, a pressure end valve hole 206 is formed on the valve seat 201 of the pressure valve disc assembly 2, and a vacuum end valve hole 301 is formed on the valve seat 201 of the vacuum valve disc assembly 3. The central axis of the pressure end valve hole 206, the central axis of the vacuum end valve hole 301, and the central axis of the cylinder part 112 coincide. This setting can make the flow field inside the cylinder part 112 more evenly distributed, which is beneficial to reducing the tremor of the storage tank breather valve.

[0120] Further, the inner diameter of the cylinder part 112 is determined according to the ventilation volume of the storage tank breather valve. Specifically, the inner diameter of the cylinder part 112 is determined according to the following formula (1):

[0121]

[0122] Among them, D1 is the inner diameter of the cylinder part 112, D2 is the diameter of the intermediate spacing cavity 105 or the diameter of the intermediate connection cavity 110 (in this embodiment, the diameter of the intermediate spacing cavity 105 is the same as the diameter of the intermediate connection cavity 110), and D is the diameter of the connection port where the storage tank connection channel 109 is connected to the tank body, and the unit is all mm.

[0123] Furthermore, the thickness range of the cylinder part 112 is all 4 mm to 6 mm. Preferably, in this embodiment, the thickness of the cylinder part 112 is all 5 mm, so as to balance the processing cost of the storage tank breather valve and the structure and strength of the storage tank breather valve.

[0124] Furthermore, the storage tank breather valve further includes a vacuum valve guide rod 16 and a first fixed film plate. A first flat head nut is provided at the bottom of the vacuum valve guide rod 16. The vacuum valve guide rod 16 is threadedly connected to the valve disc 202 of the vacuum valve disc assembly 3. The first fixed film plate is below the flexible sealing diaphragm 1503 of the sealing structure 15. The first fastening screw passes through the first fixed film plate, the flexible sealing diaphragm 1503, the valve disc 202 of the vacuum valve disc assembly 3 and the first flat head nut and is threadedly connected; a vacuum valve guide rod sleeve 113 extending upward is formed on the end cover part 111. A vacuum guide rod accommodation cavity for accommodating the vacuum valve guide rod 16 with an inner diameter of 13 mm is formed inside the vacuum valve guide rod sleeve 113. The thickness of the vacuum valve guide rod sleeve 113 is 5 mm. The difference between the inner diameter of the vacuum guide rod accommodation cavity and the outer diameter of the vacuum valve guide rod 16 is 1 mm. When the pressure in the intermediate spacing cavity 105 is normal, the valve disc 202 of the vacuum valve disc assembly 3 presses on the valve seat 201 of the vacuum valve disc assembly 3 by its own gravity. The top of the flexible sealing diaphragm 1503 of the sealing structure 15 is in close contact with the annular sealing protrusion 1501 and forms an efficient seal. The storage tank breather valve in this embodiment can adjust the lifting pressure of the vacuum valve disc assembly 3 by adjusting the weight of the valve disc 202 of the vacuum valve disc assembly 3. The opening pressure of the vacuum valve disc assembly 3 is determined by the total weight of the valve disc 202 of the vacuum valve disc assembly 3, the vacuum valve guide rod 16, the flexible sealing diaphragm 1503, the first fixed film plate, the first flat head nut, and the first counterweight plate.

[0125] Furthermore, a first limiting structure is provided at the top of the vacuum valve guide rod 16. When the valve disc 202 of the vacuum valve disc assembly 3 rises to a certain height, it cannot continue to rise. The maximum height at which the valve disc 202 of the vacuum valve disc assembly 3 rises is called the maximum lifting height of the valve disc 202 of the vacuum valve disc assembly 3. The maximum lifting height of the valve disc 202 of the vacuum valve disc assembly 3 should meet the air ventilation requirement of the storage tank breather valve and should be greater than 0.5D.

[0126] Further, the storage tank breather valve further includes a pressure valve guide rod sleeve 17, a pressure valve guide rod 18, and a one-word positioning plate 19. The pressure valve guide rod sleeve 17 is installed at the bottom of the valve seat 201 of the pressure valve disc assembly 2 through the one-word positioning plate 19 and a bolt assembly. Among them, the width range of the one-word positioning plate 19 is 15 mm to 25 mm. Preferably, the width of the one-word positioning plate 19 is 20 mm, and the one-word positioning plate 19 and the pressure valve guide rod sleeve 17 are integrally formed. A pressure guide rod accommodating cavity for accommodating the pressure valve guide rod 18 with an inner diameter of 13 mm is formed inside the pressure valve guide rod sleeve 17. The thickness of the pressure valve guide rod sleeve 17 is 5 mm. The difference between the inner diameter of the pressure guide rod accommodating cavity and the outer diameter of the pressure valve guide rod 18 is 1 mm. The manufacturing material of the pressure valve guide rod 18 includes polyphenylene sulfide material (PPS) and a fibrous body (such as glass fiber or carbon fiber). Further, the content of the fibrous body is not less than 30 wt%, enhancing the strength of the polyphenylene sulfide material (PPS). A flat head nut is provided at the top of the pressure valve guide rod 18. The second fixed film plate is below the flexible sealing diaphragm 1503, and the fastening screw passes through the second fixed film plate, the flexible sealing diaphragm 1503, the valve disc 202 of the pressure valve disc assembly 2, and the flat head nut and is threadedly connected.

[0127] When the pressure in the pressure chamber 101 is normal, the valve disc 202 of the pressure valve disc assembly 2 presses on the valve seat 201 of the pressure valve disc assembly 2 by its own gravity. The top of the flexible sealing diaphragm 1503 and the annular sealing protrusion 1501 of the sealing structure 15 are in close contact to form an efficient seal. The breather valve of this embodiment can adjust the lifting pressure of the pressure valve disc assembly 2 by adjusting the weight of the valve disc 202 of the pressure valve disc assembly 2. The opening pressure of the pressure valve disc assembly 2 is determined by the total weight of the valve disc 202 of the pressure valve disc assembly 2, the pressure valve guide rod 18, the flexible sealing diaphragm 1503, the second fixed film plate, the second flat head nut, and the second weight plate.

[0128] In another embodiment, the one-word positioning plate 19 in the storage tank breather valve is replaced with a cross positioning plate. The pressure valve guide rod sleeve 17 is installed at the bottom of the valve seat 201 of the pressure valve disc assembly 2 through the cross positioning plate and a bolt assembly. Among them, the width range of the cross positioning plate is 5 mm to 15 mm. Preferably, the width of the cross positioning plate is 10 mm, and the cross positioning plate and the pressure valve guide rod sleeve 17 are integrally formed.

[0129] Further, a second limiting structure is provided at the top of the pressure valve guide rod 18. When the valve disc 202 of the pressure valve disc assembly 2 rises to a certain height, it cannot continue to rise. The maximum height at which the valve disc 202 of the pressure valve disc assembly 2 rises is called the maximum lifting height of the valve disc 202 of the pressure valve disc assembly 2. The maximum lifting height of the valve disc 202 of the pressure valve disc assembly 2 should meet the ventilation volume requirement of the storage tank breather valve and should be greater than 0.5D.

[0130] In an embodiment of the present application, a first diversion arc surface 203 and a second diversion arc surface 204 are further provided on the valve seat 201 of the pressure valve disc assembly 2, which are respectively located radially inside and radially outside the annular sealing protrusion 1501. Both the first diversion arc surface 203 and the second diversion arc surface 204 are smooth arc surfaces, and the radius range of the smooth arc surface is 1.6 mm to 2.4 mm. Preferably, the radius of the smooth arc surface is 2 mm. This setting can timely divert the condensed water that condenses and accumulates on the radial two sides of the annular sealing protrusion 1501 in the sealing structure 15, and avoid the condensed water from freezing at the position where the sealing structure 15 is located and freezing the valve seat 201 and the valve disc of the pressure valve disc assembly 2 together.

[0131] In an embodiment of the present application, a diversion inclined surface 205 is further formed on the valve seat 201 of the pressure valve disc assembly 2, and the diversion inclined surface 205 gradually slopes downward in the radially outward direction of the valve seat 201.

[0132] Specifically, the diversion inclined surface 205 is a smooth inclined surface, and the diversion inclined surface 205 gradually slopes downward in the radially outward direction of the valve seat 201, and its inclination angle range is 5° to 10°. Preferably, the inclination angle of the diversion inclined surface 205 is 7.5°. This setting can timely divert the condensed water flowing onto the diversion inclined surface 205 out of the valve seat 201 of the pressure valve disc assembly 2, and avoid the condensed water from accumulating on the valve seat 201 of the pressure valve disc assembly 2 and freezing.

[0133] In an embodiment of the present application, a diversion groove (not shown in the figure) is formed at the radial edge position of the valve disc 202 of the pressure valve disc assembly 2, and the opening of the diversion groove faces downward. This setting not only facilitates the accumulation of condensed water at the position where the diversion groove is located, but also facilitates the diversion of the condensed water to the outside of the valve disc, further reducing the possibility of the valve disc 202 and the valve seat 201 of the pressure valve disc assembly 2 freezing together. Further, the diversion groove is annular, and the difference range between the radius of the valve disc 202 of the pressure valve disc assembly 2 and the radius of the diversion groove is 5 mm to 10 mm. Preferably, the difference between the radius of the valve disc 202 of the pressure valve disc assembly 2 and the radius of the diversion groove is 7.5 mm.

[0134] In an embodiment of the present application, the manufacturing material of the valve disc 202 of the pressure valve disc assembly 2 includes polyphenylene sulfide (PPS). The valve disc 202 made of this material can prevent the pressure valve disc assembly 2 of the storage tank breather valve from freezing in an environment of -50 °C, and can effectively protect the valve disc 202 of the pressure valve disc assembly 2. Further, the manufacturing material of the valve disc 202 of the pressure valve disc assembly 2 further includes a fibrous body, such as glass fiber or carbon fiber with a content of not less than 30 wt%, for increasing the strength of polyphenylene sulfide (PPS). Further, the manufacturing material of the valve disc 202 of the pressure valve disc assembly 2 may further include a content of not less than polyethylene (POE) or ethylene propylene diene monomer (EPDM). The content range of polyethylene (POE) or ethylene propylene diene monomer (EPDM) is 3-15 wt%, which increases the toughness and low-temperature resistance of the valve disc 202 of the pressure valve disc assembly 2.

[0135] In an embodiment of the present application, the manufacturing material of the valve disc 202 of the vacuum valve disc assembly 3 is stainless steel. This material has the advantages of anti-crystallization and strong corrosion resistance, and can effectively protect the valve disc 202 of the vacuum valve disc assembly 3.

[0136] In another embodiment of the present application, a storage tank is provided. The storage tank includes a tank body and a storage tank breather valve for the breathing of the tank body.

[0137] The anti-clogging storage tank breather valve and storage tank of the present application will be further described below through embodiments. The embodiments are implemented on the premise of the technical solution of the present application, and the detailed implementation manners and specific operation processes are given. However, the protection scope of the present application is not limited to the following embodiments.

[0138] Embodiment 1

[0139] Taking the storage tank breather valve A1 applied to a 5000-cubic crude oil tank as an example (this storage tank breather valve A1 was tested for 24 hours in an environment of -30°C), the diameter of the interface flange part at the bottom of the connecting seat 4 is DN200, the diameter of the cylinder part 112 (here referring to the diameter of the cylinder part 112) is 500 mm, and the overall height of the storage tank breather valve is 500 mm. The diameter of the valve seat 201 of the pressure valve disc assembly 2 is 200 mm, and the diameter of the valve disc 202 of the pressure valve disc assembly 2 is 260 mm. The diameter of the valve seat 201 of the vacuum valve disc assembly 3 is 200 mm, and the diameter of the valve disc 202 of the vacuum valve disc assembly 3 is 300 mm. By adjusting the weights of the valve disc 202 of the pressure valve disc assembly 2 and the valve disc 202 of the vacuum valve disc assembly 3, the opening pressures of the pressure valve disc assembly 2 and the vacuum valve disc assembly 3 are changed. The set pressure of the pressure valve disc assembly 2 is set to 1600 Pa. The lengths of the pressure valve guide rod 18 and the pressure valve guide rod sleeve 17 are set so that the maximum lift height of the valve disc 202 of the pressure valve disc assembly 2 is 60 mm, and the pressure at which the valve disc 202 of the pressure valve disc assembly 2 reaches the maximum lift height is 1728 Pa, that is, the overpressure is 8%. The reseating pressure of the valve disc 202 of the pressure valve disc assembly 2 is 1440 Pa. The set pressure of the valve disc 202 of the vacuum valve disc assembly 3 is set to -300 Pa. The lengths of the vacuum valve guide rod 16 and the vacuum valve guide rod sleeve 113 are set so that the maximum lift height of the valve disc 202 of the vacuum valve disc assembly 3 is 60 mm. The pressure when the valve disc 202 of the vacuum valve disc assembly 3 reaches the maximum lift height is -324 Pa, that is, the overpressure is 8%. The reseating pressure of the valve disc 202 of the vacuum valve disc assembly 3 is -270 Pa.

[0140] When the gas pressure in the crude oil tank is positive pressure and exceeds the exhalation set pressure of 1600 Pa of the storage tank breather valve, the valve disc 202 of the pressure valve disc assembly 2 rises upward, and the intake connection flow channel 108 and the inlet and outlet air flow channel 106 are connected. When the pressure in the crude oil tank exceeds 1728 Pa, the valve disc 202 of the pressure valve disc assembly 2 fully lifts off. The gas in the tank passes through the intake connection flow channel 108 and via the inlet and outlet air flow channel 106 to the outside. When the gas pressure in the tank is lower than the reseating pressure of 1440 Pa of the valve disc 202 of the pressure valve disc assembly 2, the valve disc 202 of the pressure valve disc assembly 2 quickly reseats. The flexible sealing diaphragm 1503 and a ring-shaped sealing protrusion 1501 on the valve disc 202 of the pressure valve disc assembly 2 cooperate with each other to form an efficient seal, and the leakage rate is not higher than 0.0025 m 3 / h. This leakage rate meets the API2000 standard (this standard is the standard for the safety management of storage tank systems in the oil and gas industry issued by the American Petroleum Institute) and belongs to a low leakage rate.

[0141] When the gas in the crude oil tank is under negative pressure and lower than the negative pressure setting pressure of -300 Pa, the valve disc 202 of the vacuum valve disc assembly 3 rises upward, the air inlet and outlet flow channel 106 and the air inlet connecting flow channel 108 are connected, the pressure in the crude oil tank is lower than -324 Pa, the valve disc 202 of the vacuum valve disc assembly 3 fully lifts off, and the outside inhales into the tank through the air inlet and outlet flow channel 106 via the air inlet connecting flow channel 108 to supplement the pressure in the tank. When the gas pressure in the tank is higher than the reseating pressure of -270 Pa of the valve disc 202 of the vacuum valve disc assembly 3, the valve disc 202 of the vacuum valve disc assembly 3 quickly reseats, and the flexible sealing diaphragm 1503 and the two annular sealing protrusions 1501 on the valve disc 202 of the vacuum valve disc assembly 3 cooperate with each other to form an efficient seal, and the leakage rate is not higher than 0.0025 m 3 / h, and this leakage rate meets the API2000 standard and belongs to a low leakage rate.

[0142] Example 2

[0143] Taking the storage tank breathing valve A2 applied to a 3000-cubic diesel oil tank as an example, the diameter of the interface flange part at the bottom of the connecting seat 4 of this storage tank breathing valve is selected as DN150, and the gas pressure in the diesel oil storage tank is set as positive pressure and exceeds the exhalation setting pressure of the storage tank breathing valve by 1000 Pa for testing. The test results show that the leakage rate of the storage tank breathing valve in the above situation is not higher than 0.0015 m 3 / h, and this leakage rate meets the API2000 standard and belongs to a low leakage rate;

[0144] The gas in the diesel oil storage tank is set as negative pressure and lower than the negative pressure setting pressure of -300 Pa for testing. The test results show that the leakage rate of the storage tank breathing valve in the above situation is not higher than 0.0015 m 3 / h, and this leakage rate meets the API2000 standard and belongs to a low leakage rate. The other settings of the storage tank breathing valve in Example 2 are the same as those in Example 1 and will not be elaborated here.

[0145] Example 3

[0146] Taking the integrated breathing storage tank breathing valve A3 applied to a 2000-cubic gasoline tank as an example, the diameter of the interface flange part at the bottom of the connecting seat 4 of this storage tank breathing valve is DN100, and the gas pressure in the gasoline tank is set as positive pressure and exceeds the exhalation setting pressure of the storage tank breathing valve by 1000 Pa for testing. The test results show that the leakage rate of the storage tank breathing valve in the above situation is not higher than 0.0015 m 3 / h, and this leakage rate meets the API2000 standard and belongs to a low leakage rate;

[0147] The gas in the gasoline tank is set as negative pressure and lower than the negative pressure setting pressure of -300 Pa for testing. The test results show that the leakage rate of the storage tank breathing valve in the above situation is not higher than 0.0015 m 3 / h. This leakage rate meets the API 2000 standard and belongs to low leakage. The other settings of the storage tank breather valve in Example 3 are the same as those in Example 1 and will not be elaborated here.

[0148] Example 4

[0149] Taking the storage tank breather valve A4 applied to a 1000-cubic lubricating oil tank as an example, the diameter of the interface flange part at the bottom of the connecting seat 4 of this storage tank breather valve is DN50. The gas pressure in the lubricating oil storage tank is set to positive pressure and exceeds the exhalation set pressure of the storage tank breather valve by 800 Pa for testing. The test results show that the leakage rate of the storage tank breather valve in the above situation is not higher than 0.0015 m 3 / h. This leakage rate meets the API 2000 standard and belongs to low leakage;

[0150] The gas in the lubricating oil storage tank is set to negative pressure and is lower than the negative pressure set pressure of -300 Pa for testing. The test results show that the leakage rate of the storage tank breather valve in the above situation is not higher than 0.0015 m 3 / h. This leakage rate meets the API 2000 standard and belongs to low leakage. The other settings of the storage tank breather valve in Example 4 are the same as those in Example 1 and will not be elaborated here.

[0151] In the description of the present application, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0152] In the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected with", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0153] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0154] Although the embodiments of this application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting this application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. The anti-blocking storage tank breather valve is characterized in that, The storage tank breathing valve comprises: A valve body (1), wherein a valve cavity inside the valve body (1) separates a pressure cavity (101) connected to a tank body of a storage tank and a vacuum cavity (102) provided with an external communication port (104), wherein the external communication port (104) opens downward; A valve disc assembly, comprising a pressure valve disc assembly (2) and a vacuum valve disc assembly (3) which are axially spaced from each other and arranged in the valve cavity, wherein the vacuum cavity (102) comprises an intermediate spacer cavity (105) between the pressure valve disc assembly (2) and the vacuum valve disc assembly (3), and an inlet and outlet flow channel (106) connecting the external communication port (104) and the intermediate spacer cavity (105); The fins (12) are arranged in the inlet and outlet air flow passages (106) and are distributed in a downwardly inclined manner.

2. The anti-clogging storage tank breather valve according to claim 1, wherein The cross section of the fin (12) is linear or arc-shaped.

3. The anti-blocking storage tank breather valve according to claim 2, characterized in that, The cross section of the fin (12) is in the shape of an arc, and the angle between the two circumferential side end surfaces of the fin (12) is in the range of 50°-70°.

4. The anti-clogging storage tank breather valve according to claim 1, characterized in that, The angle between the tangent line at the middle point of the fin (12) and the vertical plane is in the range of 40°-50°.

5. The anti-clogging storage tank breather valve according to claim 1, characterized in that, The number of the fins (12) is multiple, and the multiple fins (12) are distributed in the inlet and outlet flow channel (106) along the axial direction of the valve body (1) at intervals.

6. The anti-clogging storage tank breather valve according to claim 1, wherein The external communication port (104) is formed at the bottom end of the valve cavity with its opening facing downwards, and in the radial direction of the valve body (1), the inlet and outlet flow channels (106) are closely adjacent to the intermediate spacer cavity (105).

7. The anti-clogging storage tank breather valve according to claim 1, characterized in that, A tank communication port (103) is also formed at the bottom end of the valve cavity. The pressure cavity (101) includes an end cover cavity (107) between the top wall of the valve body (1) and the vacuum valve disc assembly (3), and an air intake communication channel (108) connecting the tank communication port (103) and the end cover cavity (107). The air intake communication channel (108) and the inlet and outlet flow channels (106) are respectively arranged on both radial sides of the valve cavity.

8. The anti-blocking storage tank breather valve according to claim 7, characterized in that, The storage tank breathing valve also includes: A connecting seat (4) docked with the tank communication port (103) and formed with a tank connecting passage (109) for connecting the tank body; The pressure chamber (101) further comprises an intermediate connecting chamber (110) formed between the connecting seat (4) and the pressure valve disc assembly (2), and the storage tank connecting channel (109), the intermediate connecting chamber (110), the air intake connecting channel (108) and the end cover chamber (107) are connected in sequence.

9. The anti-clogging storage tank breather valve according to claim 8, characterized in that, The central axis of the intermediate compartment (105), the central axis of the intermediate connection chamber (110) and the central axis of the storage tank connection channel (109) coincide with each other.

10. Storage tank, characterized in that, The storage tank comprises an anti-clogging storage tank breathing valve according to any one of claims 1-9.

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