Storage tank breather valve and storage tank

Abstract

A storage tank breather valve and a storage tank. The storage tank breather valve comprises a valve body (1) and a valve disk assembly. A valve cavity inside of the valve body is separated into a pressure cavity (101) in communication with a tank body of the storage tank and a vacuum cavity (102) provided with an external communication port (104), and an opening of the external communication port faces downward. The valve disk assembly comprises a pressure valve disk assembly (2) and a vacuum valve disk assembly (3) which are axially spaced apart from each other in the valve cavity. The vacuum cavity comprises an intermediate spacer cavity (105) between the pressure valve disk assembly and the vacuum valve disk assembly and an air inlet and outlet flow channel (106) in communication with the external communication port and the intermediate spacer cavity. The air inlet and outlet flow channel is vertically distributed and located on an outer side of the intermediate spacer cavity. The storage tank breather valve can prevent internal blockage, such that the pressure valve disk assembly can normally exhale and inhale.

Description

Breathing valve and storage tank

[0001] Cross-references to related applications

[0002] This application claims the benefit of Chinese patent applications 202411444520.1, 202422507394.1, 202422507134.4, and 202422506790.2, all filed on October 16, 2024, the contents of which are incorporated herein by reference. Technical Field

[0003] This invention belongs to the field of storage tank safety equipment technology, specifically relating to a storage tank breather valve and a storage tank. Background Technology

[0004] Tank breather valves are essential accessories for storage tanks, effectively preventing overpressure and negative pressure collapse, and balancing overpressure and vacuum caused by the entry, exit, and transfer of media within the tank. In existing technologies, the external connection port of most tank breather valves is located at the top of the valve body or on the lateral side (such as the breather valves in CN114321408B and CN220540398U). When these breather valves are in windy, sandy, or snowy environments, if the external wind, sand, or snow is heavy, the gas mixed with it can move directly downwards or laterally into the breather valve. The short movement path and lack of change in direction make it easier for external wind, sand, or snow to accumulate on the pressure valve disc and seat. This can easily prevent the pressure valve disc from properly opening. Furthermore, if the flame arrestor plate is installed at an external connection point, external wind, sand, rain, or snow can easily enter and clog it, significantly weakening the ventilation performance of the tank's breather valve and potentially causing tank collapse or bulging accidents. All of these situations will lead to the breather valve malfunctioning, compromising the safe operation of the breather valve and / or the tank itself, and posing significant safety hazards. Summary of the Invention

[0005] The purpose of this invention is to provide a breather valve for a storage tank and a storage tank, which can effectively improve the operational safety of the storage tank.

[0006] To achieve the above objectives, a first aspect of the present invention provides a tank breather valve, the tank breather valve comprising:

[0007] The valve body contains a valve cavity that separates a pressure chamber connected to the tank body of the storage tank from a vacuum chamber with an external connection port, the opening of which faces downwards; and

[0008] Valve disc assembly, including a pressure valve disc assembly and a vacuum valve disc assembly disposed axially spaced apart from each other in a valve chamber;

[0009] The vacuum chamber includes an intermediate partition cavity between the pressure valve disc assembly and the vacuum valve disc assembly, and an inlet and outlet airflow channel connecting the external connection port to the intermediate partition cavity. The inlet and outlet airflow channels are distributed vertically and located outside the intermediate partition cavity.

[0010] In an embodiment of the present invention, an external communication port is formed at the bottom of the valve cavity with the opening facing downwards, and the inlet and outlet airflow passages are adjacent to the intermediate spacer cavity in the radial direction of the valve body.

[0011] In an embodiment of the present invention, the tank breather valve further includes fins disposed in the inlet and outlet airflow channels and distributed downwardly.

[0012] Optionally, the cross-section of the fins is either straight or arc-shaped.

[0013] In an embodiment of the present invention, a storage tank connection port is also formed at the bottom end of the valve cavity. The pressure cavity includes an end cap cavity between the top wall of the valve body and the vacuum valve disc assembly, and an air inlet connection channel connecting the storage tank connection port and the end cap cavity. The air inlet connection channel and the air inlet and outlet channels are respectively arranged on the radial sides of the valve cavity.

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

[0015] The connecting seat connects to the tank connection port and forms a tank connection channel for connecting the tank body;

[0016] The pressure chamber also includes a tank connection channel and an intermediate connection cavity formed between the connection seat and the pressure valve disc assembly. The tank connection channel, the intermediate connection cavity, the air inlet communication channel and the end cover cavity are connected in sequence.

[0017] In an embodiment of the present invention, the central axis of the intermediate partition cavity and the central axis of the intermediate connecting cavity coincide with the central axis of the tank connecting channel.

[0018] In an embodiment of the present invention, the tank breather valve further includes a flame arrestor plate, which is disposed in the tank connection channel or at the location of the external connection port.

[0019] In an embodiment of the present invention, the valve body includes a hollow cylindrical portion and an end cap portion. An intermediate partition cavity, an inlet / outlet airflow passage, an inlet connecting passage, and an intermediate connecting cavity are all formed inside the cylindrical portion. The end cap portion covers the axial end of the cylindrical portion and forms an end cap cavity.

[0020] In an embodiment of the present invention, the tank breather valve further includes:

[0021] A diaphragm assembly is used to divide the valve cavity into individual chambers.

[0022] In embodiments of the present invention, the partition assembly further includes:

[0023] The first arc plate is disposed between the pressure valve disc assembly and the vacuum valve disc assembly, and is used to work together with the pressure valve disc assembly and the vacuum valve disc assembly to separate and form an intermediate spacer cavity within the valve cavity.

[0024] In embodiments of the present invention, the partition assembly further includes:

[0025] The second arc plate is located below the pressure valve disc assembly. On the horizontal plane, the second arc plate is positioned opposite to the first arc plate.

[0026] A connecting cylinder is positioned between the second arc plate and the connecting seat;

[0027] The pressure valve disc assembly, the second arc plate, and the connecting cylinder work together to separate and form an intermediate connecting cavity within the valve chamber.

[0028] In embodiments of the present invention, the partition assembly further includes:

[0029] The first partition plate has one side connected to the outer periphery of the vacuum valve disc assembly and the other side connected to the inner periphery of the cylinder.

[0030] The second partition is disposed on the first end side of the first partition;

[0031] The third partition is located on the second end side of the first partition;

[0032] The first partition, the second partition, the third partition, the second arc plate, and the connecting cylinder work together to separate and form inlet and outlet airflow channels within the valve cavity.

[0033] In embodiments of the present invention, the partition assembly further includes:

[0034] The fourth baffle is located above the connecting cylinder. One side of the fourth baffle is connected to the side of the connecting cylinder away from the second arc plate, and the other side of the fourth baffle is connected to the inner circumferential wall of the cylinder body. It works together with the second baffle, the third baffle and the first arc plate to separate and form an air intake communication channel in the valve cavity.

[0035] In embodiments of the present invention, both the pressure valve disc assembly and the vacuum valve disc assembly have sealing structures formed thereon, and the number of sealing structures on the vacuum valve disc assembly is greater than the number of sealing structures on the pressure valve disc assembly.

[0036] In embodiments of the present invention, both the pressure valve disc assembly and the vacuum valve disc assembly include a valve seat and a valve disc located above the valve seat, and the sealing structure includes:

[0037] An annular sealing protrusion is formed on the top of the valve seat;

[0038] An annular groove is formed on the valve disc and is vertically opposite to the annular sealing protrusion.

[0039] A flexible sealing diaphragm is disposed on the valve disc and covers the annular groove. When the valve seat and the valve disc are in a closed and sealed state, the annular sealing protrusion extends at least partially into the annular groove. The flexible sealing diaphragm, pushed by the protruding end of the annular sealing protrusion, elastically extends toward the annular groove.

[0040] In an embodiment of the present invention, the valve seat of the pressure valve disc assembly is further provided with a first guide arc surface and a second guide arc surface located radially inside the annular sealing protrusion and radially outside the annular sealing protrusion, respectively.

[0041] In an embodiment of the present invention, a flow guiding slope is also formed on the valve seat of the pressure valve disc assembly, and the flow guiding slope gradually slopes downward in the radially outward direction of the valve seat.

[0042] In an embodiment of the present invention, a guide groove is formed at the radial edge of the valve disc of the pressure valve disc assembly.

[0043] In embodiments of the present invention, the flexible sealing diaphragm is a perfluoroethylene-propylene copolymer component, or...

[0044] The flexible sealing diaphragm is a composite material consisting of a perfluoroethylene propylene copolymer sheet and a polyvinylidene fluoride rubber layer.

[0045] In embodiments of the present invention, the valve disc of the pressure valve disc assembly is made of polyphenylene sulfide.

[0046] A second aspect of the present invention provides a storage tank including the aforementioned storage tank breather valve.

[0047] As can be seen from the above technical solution, the tank breather valve provided by the present invention has an external connection port that faces downwards and an inlet / outlet airflow channel that is vertically distributed, which increases the difficulty for sand or snow to enter the tank breather valve. This effectively avoids the problem of sand or snow easily entering the tank breather valve and causing blockage, allowing the pressure valve disc assembly of the tank breather valve to breathe normally, improving the working reliability and safety of the tank breather valve, and thus ensuring that the tank with the breather valve installed can operate normally.

[0048] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0049] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. Those skilled in the art can obtain other drawings based on the structures shown in these drawings without any inventive effort. In the drawings:

[0050] Figure 1 is a first cross-sectional schematic diagram of the breather valve of the storage tank in an embodiment of the present invention;

[0051] Figure 2 is a second cross-sectional schematic diagram of the breather valve of the storage tank in an embodiment of the present invention;

[0052] Figure 3 is a magnified view of part A in Figure 2;

[0053] Figure 4 is a magnified view of part B in Figure 2;

[0054] Figure 5 is a schematic diagram of the overall structure of the tank breather valve in an embodiment of the present invention;

[0055] Figure 6 is a first-view cross-sectional view of the valve body in an embodiment of the present invention;

[0056] Figure 7 is a second-view cross-sectional view of the valve body in an embodiment of the present invention;

[0057] Figure 8 is a third-view cross-sectional view of the valve body in an embodiment of the present invention;

[0058] Figure 9 is a fourth-view cross-sectional view of the valve body in an embodiment of the present invention;

[0059] Figure 10 is a first-view structural view of the valve body in an embodiment of the present invention;

[0060] Figure 11 is a second-view structural view of the valve body in an embodiment of the present invention;

[0061] Figure 12 is a schematic diagram of the first sealing structure in an embodiment of the present invention;

[0062] Figure 13 is a schematic diagram of the second sealing structure in an embodiment of the present invention.

[0063] Figure Reference Numerals 1. Valve Body 101. Pressure Chamber 102. Vacuum Chamber 103. Tank Connection Port 104. External Connection Port 105. Intermediate Spacing Chamber 106. Inlet / Outlet Airflow Channel 107. End Cover Chamber 108. Inlet Airflow Channel 109. Tank Connection Channel 110. Intermediate Connection Chamber 111. End Cover 112. Cylinder 113. Vacuum Valve Guide Rod Sleeve 2. Pressure Valve Disc Assembly 201. Valve Seat 202. Valve Disc 203. First Guide Arc Surface 204. Second Guide Arc Surface 205. Guide Inclined Surface 206. Pressure End Valve Hole 3. Vacuum Valve Disc Assembly 301. Vacuum End Valve Hole 4. Connecting Seat 5. First Baffle 6. Second Baffle 7. Third Baffle 8. First Arc Plate 801. First Side Opening 9. Second Arc Plate 901. Second Side Opening 10. Connecting Cylinder 11. Fourth Baffle 12. Fin 13. Flame Arrestor Plate14 Insulation pad 15 Sealing structure 1501 Annular sealing protrusion 1502 Annular groove 1503 Flexible sealing diaphragm 16 Vacuum valve guide rod 17 Pressure valve guide rod sleeve 18 Pressure valve guide rod 19 Single-piece positioning plate Detailed Implementation

[0064] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0065] In existing technologies, the external connection port of the breather valve of a storage tank is mostly located at the top of the valve body or on the lateral side of the valve body. When the breather valve of the above-mentioned structure is in a windy, sandy, rainy, or snowy environment, if the external wind, sand, rain, or snow is heavy, the gas mixed with the external wind, sand, rain, or snow can move directly downwards or laterally into the interior of the breather valve. The movement path is short and there is no need to change the direction of movement, making it easier for the external wind, sand, rain, or snow to accumulate on the pressure valve disc and valve seat. The above situation can easily cause the pressure valve disc to fail to open normally, which in turn causes the breather valve of the storage tank to malfunction, making it impossible to ensure the safe operation of the breather valve and / or the storage tank, and bringing great safety hazards.

[0066] To avoid the above situation, embodiments of the present invention provide a tank breather valve, which includes:

[0067] Valve body 1, the valve cavity inside valve body 1 is divided into a pressure chamber 101 communicating with the tank body of the storage tank and a vacuum chamber 102 having an external communication port 104, the opening of the external communication port 104 facing downwards; and

[0068] The valve disc assembly includes a pressure valve disc assembly 2 and a vacuum valve disc assembly 3, which are axially spaced from each other in the valve chamber;

[0069] The vacuum chamber 102 includes an intermediate spacer 105 between the pressure valve disc assembly 2 and the vacuum valve disc assembly 3, and an inlet / outlet airflow channel 106 connecting the external connection port 104 and the intermediate spacer 105. The inlet / outlet airflow channel 106 is vertically distributed and located outside the intermediate spacer 105.

[0070] Specifically, in this embodiment, the valve body 1 includes a cylindrical part, a horizontal connecting part, and a vertical connecting part. The horizontal connecting part is disposed on the peripheral wall of the cylindrical part and distributed in the horizontal direction. The vertical connecting part is distributed in the vertical direction and its top is connected to the horizontal connecting part. The cavity inside the cylindrical part, the cavity inside the horizontal connecting part, and the cavity inside the vertical connecting part together form the valve cavity. The pressure cavity 101 and the intermediate partition cavity 105 are both formed inside the cylindrical part. The inlet and outlet airflow passage 106 is formed inside the vertical connecting part, and the external communication port 104 is formed at the bottom of the vertical connecting part. When the breather valve of the storage tank is used in environments with strong winds, sandstorms, or heavy rain and snow, during the intake process of the breather valve, the first gas from the outside enters the inlet / outlet air passage 106 through the outside connection port 104, then flows through the inlet / outlet air passage 106 into the cavity in the horizontal connection part, and then enters the intermediate partition cavity 105 from the cavity in the horizontal connection part. If the pressure in the intermediate partition cavity 105 is greater than the pressure in the pressure chamber 101 (i.e., when the internal pressure of the tank is lower than the intake pressure), the vacuum valve disc assembly 3 will start. At this time, the first gas from the outside enters the pressure chamber 101 and the tank body of the storage tank from the intermediate partition cavity 105. Since the external connection port 104 in this embodiment faces downwards and the inlet / outlet airflow channels 106 are vertically distributed, the first gas from the outside (which may contain rain, snow, or sand particles) must move upwards into the inlet / outlet airflow channels 106 after passing through the external connection port 104. (During this process, the external force on the first gas decreases, and some rain, snow, or sand particles may fall under gravity and land outside the tank breather valve.) It then moves upwards to the top of the inlet / outlet airflow channels 106, changes its flow direction, and enters the cavity in the horizontal connection portion and the intermediate spacer cavity 105 between the pressure valve disc assembly 2 and the vacuum valve disc assembly 3. Compared to rain, snow, or sand particles directly entering the tank breather valve from the top or side of the valve body 1, the tank breather valve in this embodiment increases the difficulty for the first gas containing rain, snow, or sand particles to enter the pressure chamber 101 from the outside, thus preventing blockage inside the tank breather valve.

[0071] In this embodiment, when the tank breathing valve needs to exhale (i.e., the internal pressure of the tank exceeds the exhalation pressure), the pressure valve disc assembly 2 will start, and the gas in the pressure chamber 101 will enter the intermediate partition chamber 105, and then flow to the outside through the cavity in the horizontal connection part and the inlet and outlet airflow passage 106.

[0072] In another embodiment of the present invention, as shown in Figures 1-2 and 5-9, the external communication port 104 is formed at the bottom of the valve cavity with the opening facing downwards, and the inlet and outlet airflow passage 106 is adjacent to the intermediate spacer cavity 105 in the radial direction of the valve body 1.

[0073] Specifically, the first gas from the outside (which may contain rain, snow, or sand) passes through the external connection port 104 and moves upward into the inlet / outlet airflow channel 106. (During this process, the external force on the first gas decreases, and some rain, snow, or sand may fall under gravity and land outside the tank's breather valve.) It then moves upward to the top of the inlet / outlet airflow channel 106, changes its flow direction, and enters the intermediate partition cavity 105 between the pressure valve disc assembly 2 and the vacuum valve disc assembly 3. When the tank's breather valve needs to exhale (i.e., the internal pressure of the tank exceeds the exhalation pressure), the pressure valve disc assembly 2 activates, and the gas in the pressure chamber 101 enters the intermediate partition cavity 105, then flows to the outside through the inlet / outlet airflow channel 106. This design avoids blockage inside the tank's breather valve and allows for a more compact internal layout of the valve body 1, reducing the overall volume of the breather valve and facilitating its miniaturization.

[0074] In one embodiment of the present invention, a storage tank connection port 103 is also 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 cavity 107 between the top wall of the valve body 1 and the vacuum valve disc assembly 3, and an air inlet connection channel 108 connecting the storage tank connection port 103 and the end cap cavity 107. The air inlet connection channel 108 and the air inlet and outlet channels 106 are respectively arranged on the radial sides of the valve cavity.

[0075] Specifically, the temperature of the storage medium inside the tank is 3°C to 5°C higher than its freezing point. When the tank breather valve in this embodiment is in a cold working environment (e.g., -20°C to -50°C), the first gas from the outside is cold air, and the second gas exhaled by the tank breather valve is hot air. After the vacuum valve disc assembly 3 is activated, the first gas from the outside enters the end cover cavity 107 and the air inlet connecting channel 108 from the intermediate partition cavity 105, and then enters the tank body of the storage tank from the air inlet connecting channel 108 and the storage tank connecting port 103. Since the tank connection port 103 is formed at the bottom of the valve cavity and the end cap cavity 107 is at the top of the valve cavity in this embodiment, the first gas entering the pressure chamber 101 must pass vertically through the entire valve cavity to enter the tank. Since the inlet and outlet airflow channels 106 and the inlet connecting flow channel 108 are respectively on the radial sides of the valve cavity, the first gas entering the tank from the outside must go around from one radial side of the cylinder part 112 to the other radial side. The path is long and the flow direction needs to be changed multiple times, which further increases the difficulty of the first gas entering the tank from the outside. This is conducive to making the first gas entering the tank more smoothly, thereby reducing the likelihood of the pressure valve disc assembly 2 jumping less, reducing the probability of the first gas and the second gas meeting and generating condensate (or water vapor) which condenses on the pressure valve disc assembly 2, and further improving the working reliability and safety of the tank breather valve.

[0076] Furthermore, although the interior of the tank breather valve in this embodiment is provided with multiple chambers that can increase the difficulty for the first gas to enter the tank, the ventilation volume of the tank breather valve can still meet the API2000 standard (or ISO28300 standard) by increasing the flow area of ​​the gas inside the tank breather valve (such as increasing the radial width of the inlet and outlet airflow channels 106 and the inlet connecting flow channel 108).

[0077] In one embodiment of the present invention, the tank breather valve further includes:

[0078] The connecting seat 4 is connected to the tank connection port 103 and forms a tank connection channel 109 for connecting the tank body;

[0079] The pressure chamber 101 also includes a tank connection channel 109 and an intermediate connection cavity 110 formed between the connecting seat 4 and the pressure valve disc assembly 2. The tank connection channel 109, the intermediate connection cavity 110, the air inlet communication channel 108 and the end cover cavity 107 are connected in sequence. The tank connection channel 109, the intermediate connection cavity 110, the intermediate partition cavity 105 and the end cover cavity 107 are distributed in sequence along the axial direction from the first axial end to the second axial end.

[0080] Specifically, the upper end of the connecting seat 4 is connected to the valve body 1 by bolts or a snap-fit ​​structure. The tank connection port 103 is formed at the bottom of the intermediate connection cavity 110. The end of the tank connection channel 109 away from the tank body is connected to the intermediate connection cavity 110. When the vacuum valve disc assembly 3 is in the pop-up state, the external first gas first enters the end cover cavity 107 from the intermediate partition cavity 105, and then enters the tank body through the air inlet connection channel 108, the intermediate connection cavity 110 and the tank connection channel 109. The above arrangement extends the flow path of the first gas into the tank body, improves the stability of the first gas flow, and allows the first gas to enter the tank body more smoothly, reducing the disturbance of the gas in the tank body. This makes the breathing of the tank breather valve more stable, which is conducive to further ensuring the reliability of the tank breather valve.

[0081] In one embodiment of the present invention, as shown in Figures 1-2, the valve body 1 includes a hollow cylindrical portion 112 and an end cap portion 111. An intermediate partition cavity 105, an inlet / outlet airflow channel 106, an inlet connecting channel 108, and an intermediate connecting cavity 110 are all formed inside the cylindrical portion 112. The end cap portion 111 covers the axial end of the cylindrical portion 112 and forms an end cap cavity 107.

[0082] Specifically, the end cap cavity 107 is recessed upward from the bottom surface of the end cap portion 111. The end cap portion 111 and the top of the cylindrical portion 112 are fitted together by bolts or a snap-fit ​​structure. Preferably, the end cap portion 111 is fixed to the cylindrical portion 112 by a snap-fit ​​structure to ensure a stable and good fit between the two. Furthermore, the corner connection between the top wall and the peripheral wall of the end cap cavity 107 is formed as a smooth arc transition, where the radius of the arc is 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 The radius of the end cap 111 is such that this arrangement can improve the stress concentration of the end cap 111 and the tank breather valve, and also optimize the flow of gas in the end cap cavity 107.

[0083] In one embodiment of the present invention, as shown in Figures 6-11, the tank breather valve further includes:

[0084] The baffle assembly is used to divide the valve cavity into various chambers. In this embodiment, each chamber includes an intermediate partition chamber 105, an intermediate connecting chamber 110, an inlet / outlet airflow passage 106, and an inlet connecting passage 108.

[0085] Specifically, the partition assembly includes:

[0086] The first arc plate 8 is disposed between the pressure valve disc assembly 2 and the vacuum valve disc assembly 3, and is used to work together with the pressure valve disc assembly 2 and the vacuum valve disc assembly 3 to separate and form an intermediate spacer cavity 105 in the valve cavity.

[0087] The second arc plate 9 is located below the pressure valve disc assembly 2. On the horizontal plane, the second arc plate 9 is positioned opposite to the first arc plate 8.

[0088] The connecting cylinder 10 is disposed 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 work together to separate and form an intermediate connecting cavity 110 in the valve cavity.

[0089] The first partition 5 has one side connected to the outer periphery of the vacuum valve disc assembly 3, and the other side connected to the inner periphery of the cylinder 112.

[0090] The second partition 6 is disposed on the first end side of the first partition 5;

[0091] The third partition 7 is disposed 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 work together to separate and form an inlet and outlet airflow channel 106 in the valve cavity.

[0092] The fourth partition 11 is disposed 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 cylinder part 112. It is used to work together with the second partition 6, the third partition 7 and the first arc plate 8 to separate and form an air intake communication channel 108 in the valve cavity.

[0093] In this embodiment, the first partition 5 and the fourth partition 11 are both arranged horizontally and are arc-shaped. The first partition 5 and the fourth partition 11 are respectively located on the radial 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 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 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 is formed between the two circumferential ends of the first arc plate 8, which connects the inlet and outlet airflow channel 106 and the intermediate partition cavity 105. A second side opening 901 is formed between the two circumferential ends of the second arc plate 9, which connects the inlet airflow channel 108 and the intermediate connecting cavity 110. The above-mentioned settings further extend the flow path of the first gas in the tank breather valve, increase the number of turns required for the first gas to flow in the tank breather valve, further improve the stability of the first gas flow, further reduce the disturbance of the gas in the tank, and thus make the breathing of the tank breather valve more stable, which is conducive to further ensuring the reliability of the tank breather valve.

[0094] In one embodiment of the present invention, the tank breather valve further includes fins 12 disposed in the inlet and outlet airflow passages 106 and distributed downwardly.

[0095] Optionally, the cross-section of the fin 12 is either straight or arc-shaped.

[0096] Specifically, in this embodiment, the number of fins 12 can be multiple (e.g., 2, 3, 4, or other numbers). Multiple fins 12 are sequentially and alternately arranged on the inner peripheral wall of the cylinder 112, the outer side wall of the second arc plate 9, and the outer side wall of the connecting cylinder 10. The spacing between two vertically adjacent fins 12 meets the ventilation requirements of the tank's breather valve. The arrangement of the fins 12 increases the difficulty for the first gas to enter the inlet / outlet airflow channel 106 and the intermediate partition cavity 105 from the outside, thus blocking rain, snow, or sand mixed in the first gas during the intake process of the tank's breather valve. Furthermore, by spaced out multiple fins 12 in the vertically distributed inlet / outlet airflow channels 106, the upward force of rain, snow, or sand is reduced (compared to the outside, less first gas enters the inlet / outlet airflow channel 106, thus reducing the upward force on the rain, snow, or sand mixed in the first gas). Since the gravity of the rain, snow, or sand remains unchanged, the rain, snow, or sand mixed in the first gas is also reduced. The increased difficulty of upward movement of wind and sand, as well as the increased probability of rain, snow, or wind and sand colliding with the fins 12 and falling after entering the inlet / outlet airflow channel 106, thus separating from the first gas, further increases the difficulty of rain, snow, or wind and sand mixed in the first gas moving into the intermediate compartment 105. This helps reduce the amount of rain, snow, or wind and sand entering the tank's breather valve, thereby further alleviating or preventing rain, snow, or wind and sand from clogging the inside of the tank's breather valve. It can also guide the gas as it flows out of the tank's breather valve, allowing the second gas exhaled from the tank's breather valve to flow out quickly (i.e., this fin arrangement makes the resistance when the second gas is discharged from the tank much less than the resistance when the first gas is drawn in, thus satisfying the optimal flow channel design). In addition, when the tank's breather valve exhales, the first gas in the intermediate compartment 105 and the exhaled second gas meet and produce condensate. The fin arrangement can quickly guide the condensate flowing out of the inlet / outlet airflow channel 106 to the outside of the tank's breather valve.

[0097] Furthermore, the inner peripheral wall of the cylinder 112, the outer peripheral wall of the second arc plate 9, the outer peripheral wall of the connecting cylinder 10, and the fin 12 are connected by an arc transition. The included angle between the inner peripheral wall of the cylinder 112, the outer peripheral wall of the second arc plate 9, the outer peripheral wall of the connecting cylinder 10, and the fin 12 is in the range of 40°-50°. For example, the included angle between the inner peripheral wall of the cylinder 112, the outer peripheral wall of the second arc plate 9, the outer peripheral wall of the connecting cylinder 10, and the fin 12 is in the range of 40°, 42°, 45°, 47°, or 50°. Preferably, the included angle is 45°, so as to change the flow direction of the first gas inflow or the second gas outflow. In this embodiment, the cross-section of the fin 12 is preferably arc-shaped, the arc being 1 / 6 of a full circle, and the thickness of the fin 12 is 5mm, which is beneficial to further improve the ability to drain condensate.

[0098] In one embodiment of the present invention, the inner wall of the vacuum chamber 102 is provided with a hydrophobic coating or an oleophobic coating.

[0099] Specifically, the inner wall of the vacuum chamber 102 includes the bottom wall of the first partition 5, the inner side wall of the cylindrical part 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. When the substance stored in the storage tank is a non-oily substance, a hydrophobic coating is provided on the inner wall of the vacuum chamber 102. In this embodiment, the hydrophobic coating can be a methylsilicone coating (or other superhydrophobic material coating). Since methylsilicone has high weather resistance, water resistance, moisture resistance and chemical resistance, and the coating is transparent, hard, wear-resistant, heat-resistant and has excellent hydrophobicity.

[0100] When the stored substance in the tank is an oily substance, an oleophobic coating is provided on the inner wall of the vacuum chamber 102. In this embodiment, the oleophobic coating is a nano-coating (or other oleophobic and hydrophobic material coating). The nano-coating utilizes nanomaterials to introduce changes in surface rheological properties and form nanostructures, and has good hydrophobic and oleophobic properties as well as high temperature resistance and corrosion resistance. The above-mentioned arrangement can prevent the oily gas volatilized at high temperature in the tank from cooling and solidifying in the breather valve of the storage tank and forming sticky oil on the inner wall of the vacuum chamber 102, thereby preventing the pressure valve disc assembly 2 from failing to perform the start-up operation normally.

[0101] In one embodiment of the present invention, the central axis of the intermediate partition cavity 105 and the central axis of the intermediate connecting cavity 110 coincide with the central axis of the tank connecting channel 109.

[0102] Specifically, the bottom of the connecting seat 4 has an interface flange for connecting the tank. The selection of the tank breather valve model is related to the tank volume and the amount of breathable air per unit time. In this embodiment, the diameter of the interface flange is the size of the tank breather valve model. The above setting can make the flow field distribution inside the valve body 1 more uniform, which is beneficial to reduce the vibration of the tank breather valve.

[0103] In one embodiment of the present invention, the tank breather valve further includes a flame arrestor plate 13, which is disposed in the tank connection channel 109 or at the location of the external connection port 104.

[0104] Specifically, the upper end of the connecting seat 4 is connected to the connecting cylinder 10 by bolts or a snap-fit ​​structure. The interior of the connecting seat 4 has a flame arrestor plate mounting groove. When the tank stores non-oily substances, the flame arrestor plate 13 is set in the flame arrestor plate mounting groove. When the tank breather valve in this embodiment is applied to a cold environment (such as in the winter in northern regions, where the temperature can reach -20°C and the nighttime temperature can even reach -40°C), the above setting can facilitate the tank breather valve to use the storage medium in the tank (which has a high temperature) to heat the flame arrestor plate 13, which can effectively prevent the flame arrestor plate 13 from freezing.

[0105] When the stored substance in the tank in this embodiment is an oily substance, the flame arrestor plate 13 covers the external connection port 104 (not shown in the figure of this embodiment) in the horizontal direction. This arrangement extends the outflow path of the oily gas exhaled from the tank's breather valve, which helps to reduce the possibility of oily gas accumulating and condensing at the flame arrestor plate 13.

[0106] In one embodiment of the present invention, the thickness of the flame arrestor plate 13 ranges from 3mm to 5mm. This range ensures that the flame arrestor plate 13 is not too thick, thus affecting its ventilation capacity. The thickness of the flame arrestor plate 13 can be selected as 3mm, 4mm, or 5mm, specifically determined based on the required ventilation capacity of the tank's breather valve. Further, the flame arrestor plate 13 is preferably a metal mesh type, with the mesh size of the flame arrestor layer ranging from 16 mesh to 22 mesh.

[0107] In another embodiment of the present invention, the valve body 1 and the connecting seat 4 are integrally cast, and the assembly of the valve body 1 and the connecting seat 4 is made of stainless steel.

[0108] In one embodiment of the present invention, the tank breather valve further includes a heat tracing jacket disposed on the outer periphery of the connecting seat 4.

[0109] Specifically, when the substance stored in the tank is an oily substance, the tank breather valve also includes a heat tracing jacket set on the outer periphery of the connecting seat 4. An insulation cavity is formed between the heat tracing jacket and the valve seat 201. A heat source jacket inlet and a heat source jacket outlet are formed on the cavity wall of the insulation cavity. The storage medium (the storage medium has a high temperature) or steam in the tank can be used for heat tracing to heat the flame arrestor plate 13 located on the connecting seat 4. Through heat tracing, heat is continuously transferred to the vicinity of the flame arrestor plate 13, which can effectively prevent easily condensable high-viscosity oil from condensing at the flame arrestor plate 13, thereby ensuring that the tank breather valve has sufficient ventilation.

[0110] In one embodiment of the present invention, the tank breather valve further includes a heat insulation pad 14 or a heat tracing coil disposed on the outer periphery of the cylinder portion 112.

[0111] Specifically, when the substance stored in the tank is a non-oily substance, a heat-insulating pad 14, such as a sponge pad, is provided on the outer periphery of the cylinder part 112 to effectively ensure the temperature inside the breather valve of the storage tank and prevent condensation on the pressure valve disc assembly 2; when the substance stored in the storage tank is an oily substance, a heat tracing coil is provided around the outer periphery of the cylinder part 112, and the two ends of the heat tracing coil are provided with a heat tracing medium inlet and a heat tracing medium outlet. In this embodiment, the heat tracing medium is preferably steam. This arrangement further ensures that the inside of the breather valve of the storage tank has a sufficiently high temperature to prevent oily gas from condensing inside the breather valve of the storage tank.

[0112] Tank breather valves are suitable not only for environments with heavy rain, snow, or sandstorms, but also for cold environments (such as winters in northern regions where temperatures can reach -20°C, and nighttime temperatures can even reach -40°C). During tank operation, the storage temperature of the medium inside the tank often needs to be 3°C to 5°C higher than its freezing point. However, in existing technologies, due to the temperature difference between the inside and outside of the tank, the second gas inside the tank encounters the first gas outside during the exhalation process. Water vapor condenses into water droplets and adheres to the inner wall and valve disc of the breather valve. In extremely low temperatures, this further frosts and freezes, reducing the sealing performance of the breather valve, increasing leakage, and in severe cases, freezing the valve disc and seat together, preventing the valve disc from opening properly and the breather valve from functioning correctly. On the other hand, if the valve body and valve disc of the breather valve are in contact with water vapor for a long time, it will accelerate the corrosion of the valve body and valve disc, forming a rust layer. The rust layer will further exacerbate the freezing and frost formation of water vapor. Both of these situations will cause the breather valve to malfunction, thus compromising the safe operation of the storage tank.

[0113] When applied to cold environments, in this embodiment of the invention, both the pressure valve disc assembly 2 and the vacuum valve disc assembly 3 of the tank breather valve have sealing structures 15 (as shown in Figures 3-4 and 12-13), and 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 (e.g., the number of sealing structures 15 on the vacuum valve disc assembly 3 is 2, 3, 4, or other numbers, while the number of sealing structures 15 on the pressure valve disc assembly 2 is 1, 2, 3, or other numbers). 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:

[0114] An annular sealing protrusion 1501 is formed on the top of the valve seat 201;

[0115] An annular groove 1502 is formed on the valve disc and is vertically opposite to the annular sealing protrusion 1501.

[0116] A flexible sealing diaphragm 1503 is disposed on the valve disc and covers the annular groove 1502. When the valve seat 201 and the valve disc are in a closed and sealed state, the annular sealing protrusion 1501 extends at least partially into the annular groove 1502. The flexible sealing diaphragm 1503, pushed by the protruding end of the annular sealing protrusion 1501, elastically extends toward the annular groove 1502.

[0117] Specifically, the opening of the annular groove 1502 faces downward, a fitting sealing surface is formed on the valve disc 202, and the flexible sealing diaphragm 1503 is disposed 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 protrusion 1501 on the valve seat 201 can extend upward into the annular groove 1502 at least partially. At this time, the annular sealing protrusion 1501 and the flexible sealing diaphragm 1503 form a sealing structure 15. Furthermore, since the intermediate partition cavity 105 is connected to the outside, the first gas from the outside can easily enter the interior of the tank breather valve during the intake process of the tank breather valve, and no condensation 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 tank breather valve has sufficient sealing performance (in this embodiment, the flexible sealing diaphragm 1503 of the two sets of sealing structures 15 are integrally formed); during the exhalation process of the tank breather valve, the second gas exhaled from the tank and the first gas from the outside can easily generate condensation (condensation is easy to freeze after the temperature drops). If multiple sets of sealing structures 15 are provided on the pressure valve disc assembly 2, water will more easily accumulate on the pressure valve disc assembly 2 and cause freezing. Therefore, in this embodiment, only one set of sealing structures 15 can be provided on the pressure valve disc assembly 2.

[0118] The sealing structure 15 in this embodiment can not only ensure the sealing performance of the tank breather valve and effectively reduce the probability of leakage, but also further reduce the possibility of icing and frosting of the pressure valve disc assembly 2, thereby further improving the safety and environmental performance of the tank breather valve and helping to protect personal and property safety.

[0119] In one embodiment of the present invention, the flexible sealing diaphragm 1503 is a perfluoroethylene propylene copolymer (FEP) material, that is, the flexible sealing diaphragm 1503 in the sealing structure 15 is made of FEP. The thickness of the flexible sealing diaphragm 1503 is in the range of 0.5 mm to 3 mm, such as 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 degree of hardness.

[0120] In another embodiment of the present invention, the flexible sealing diaphragm 1503 is a composite material of a perfluoroethylene propylene copolymer sheet and a polyvinylidene fluoride rubber layer. The aforementioned flexible sealing diaphragm 1503 can be obtained by bonding the perfluoroethylene propylene copolymer sheet and the polyvinylidene fluoride rubber layer together, and then vacuum-pressing the bonded mixture.

[0121] The flexible sealing diaphragm 1503 prepared by the above method can delay freezing time and reduce the adhesion strength of ice layer in the breather valve of the storage tank, allowing the breather valve to open normally in low-temperature environments. Simultaneously, the flexible sealing diaphragm 1503 maintains good elasticity in the leakage range of the breather valve from 0.85 times to below the opening pressure (i.e., the multiple range is 0.85 to 1 times the opening pressure), thereby reducing the leakage of the breather valve. Perfluoroethylene-propylene copolymer and polyvinylidene fluoride rubber are commercially available.

[0122] Furthermore, the height range of the valve seat 201 of the pressure valve disc assembly 2 can be 25mm to 35mm, such as 25mm, 27mm, 30mm, 32mm or 35mm. Preferably, the height of the valve seat 201 of the pressure valve disc assembly 2 is 30mm to ensure that the valve seat 201 of the pressure valve disc assembly 2 has sufficient strength.

[0123] The height of the annular sealing protrusion 1501 of the sealing structure 15 can range from 3mm to 3.4mm, such as 3mm, 3.1mm, 3.2mm, or 3.4mm; the inner angle of the annular sealing protrusion 1501 of the sealing structure 15 can be 45°-80°. Preferably, the height of the annular sealing protrusion 1501 of the sealing structure 15 is 3.2mm, and the inner angle of the annular sealing protrusion 1501 of the sealing structure 15 is 60°.

[0124] Furthermore, in the pressure valve disc assembly 2, the difference between the radius of the valve disc 202 and the radius of the valve seat 201 is in the range of 20mm to 30mm, such as 20mm, 22mm, 25mm, 27mm or 30mm. Preferably, in this embodiment, the difference between the radius of the valve disc 202 and the radius of the valve seat 201 is 25mm.

[0125] Furthermore, 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 in the range of 10mm to 20mm. 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 10mm, 12mm, 15mm, 17mm or 20mm. Preferably, the difference is 15mm, which facilitates the installation and maintenance of the valve disc 202 of the pressure valve disc assembly 2 by removing the end cover 111.

[0126] Furthermore, in the vacuum valve disc assembly 3, the height of the valve seat 201 ranges from 25mm to 35mm, such as 25mm, 27mm, 30mm, 32mm, or 35mm. Preferably, the height of the valve seat 201 is 30mm to ensure sufficient strength. The height of the annular sealing protrusion 1501 ranges from 3mm to 3.4mm, such as 3mm, 3.1mm, 3.2mm, 3.3mm, or 3.4mm. Preferably, the height of the annular sealing protrusion 1501 is 3.2mm, and the inner angle of the annular sealing protrusion 1501 is 60°. Additionally, the distance between the two sealing structures 15 on the vacuum valve disc assembly 3 is 8mm.

[0127] Furthermore, the inner diameter of the cylindrical body 112 is determined according to the radius of the valve seat 201 of the vacuum valve disc assembly 3. The difference between the inner diameter of the cylindrical body 112 and the radius of the valve seat 201 of the vacuum valve disc assembly 3 is in the range of 15mm to 25mm. For example, the difference between the inner diameter of the cylindrical body 112 and the radius of the valve seat 201 of the vacuum valve disc assembly 3 is 15mm, 17mm, 20mm, 22mm or 25mm. Preferably, the difference is 20mm.

[0128] Furthermore, the thickness of the first arc plate 8, the second arc plate 9, and the connecting cylinder 10 is all in the range of 4mm to 6mm, such as the thickness of the first arc plate 8, the second arc plate 9, and the connecting cylinder 10 being 4mm, 4.5mm, 5mm, or 6mm. Preferably, the above thicknesses are all 5mm, so as to balance the processing cost of the tank breather valve with the structure and strength of the tank breather valve.

[0129] Furthermore, in the vacuum valve disc assembly 3, the difference between the radius of the valve disc and the radius of the valve seat 201 is in the range of 20mm to 30mm, such as 20mm, 22mm, 25mm, 27mm or 30mm. Preferably, in this embodiment, the difference between the radius of the valve disc and the radius of the valve seat 201 is 25mm.

[0130] In one embodiment of the present invention, 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 portion 112 coincide. This arrangement can make the flow field distribution inside the cylinder portion 112 more uniform, which is beneficial to reduce the vibration of the breather valve of the storage tank.

[0131] Furthermore, the inner diameter of the cylindrical section 112 is determined based on the ventilation rate of the tank's breather valve. Specifically, the inner diameter of the cylindrical section 112 is determined according to the following formula (1):

[0132] Wherein, D′1 is the inner diameter of the cylindrical part 112, D′2 is the diameter of the intermediate partition cavity 105 or the diameter of the intermediate connecting cavity 110 (in this embodiment, the diameter of the intermediate partition cavity 105 and the diameter of the intermediate connecting cavity 110 are the same), and D is the diameter of the connection port of the tank connecting channel 109 connecting to the tank body, all in mm.

[0133] Furthermore, the thickness of the cylindrical part 112 is in the range of 4mm to 6mm. Preferably, in this embodiment, the thickness of the cylindrical part 112 is 5mm, so as to balance the processing cost of the tank breather valve with the structure and strength of the tank breather valve.

[0134] Furthermore, the tank breather valve also includes a vacuum valve guide rod 16 and a first solid film circular plate. The bottom of the vacuum valve guide rod 16 is provided with a first flat-head nut. The vacuum valve guide rod 16 and the valve disc 202 of the vacuum valve disc assembly 3 are threaded together. The first solid film circular plate is located below the flexible sealing diaphragm 1503 of the sealing structure 15. A first fastening screw passes through the first solid film circular plate, the flexible sealing diaphragm 1503, the valve disc 202 of the vacuum valve disc assembly 3, and the first flat-head nut, forming a threaded connection. An upwardly extending vacuum valve guide rod sleeve 113 is formed on the end cap 111. The interior of the vacuum valve guide rod sleeve 113 forms a vacuum guide rod receiving cavity with an inner diameter of 13mm for accommodating the vacuum valve guide rod 16. The thickness of the vacuum valve guide rod sleeve 113 is 5mm. The difference between the inner diameter of the cavity and the outer diameter of the vacuum valve guide rod 16 is 1mm. When the pressure of the intermediate partition cavity 105 is normal, the valve disc 202 of the vacuum valve disc assembly 3 presses against the valve seat 201 of the vacuum valve disc assembly 3 by its own weight. The flexible sealing diaphragm 1503 of the sealing structure 15 and the top of the annular sealing protrusion 1501 are in close contact and form an efficient seal. In this embodiment, the tank breather valve can adjust the opening pressure of the vacuum valve disc assembly 3 by adjusting the counterweight 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, vacuum valve guide rod 16, flexible sealing diaphragm 1503, first solid film circular plate, first flat-head nut, and first counterweight plate of the vacuum valve disc assembly 3.

[0135] Furthermore, the top of the vacuum valve guide rod 16 is provided with a first limiting structure. 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 that the valve disc 202 of the vacuum valve disc assembly 3 can rise to is called the maximum starting height of the valve disc 202 of the vacuum valve disc assembly 3. The maximum starting height of the valve disc 202 of the vacuum valve disc assembly 3 should meet the ventilation requirements of the tank breather valve and should be greater than 0.5D.

[0136] Furthermore, the tank breather valve also includes a pressure valve guide sleeve 17, a pressure valve guide rod 18, and a single-piece positioning plate 19. The pressure valve guide sleeve 17 is installed at the bottom of the valve seat 201 of the pressure valve disc assembly 2 via the single-piece positioning plate 19 and bolt assembly. The width of the single-piece positioning plate 19 is in the range of 15mm to 25mm, preferably 20mm. The single-piece positioning plate 19 and the pressure valve guide sleeve 17 are integrally formed. The pressure valve guide rod sleeve 17 has an internal pressure guide rod receiving cavity with an inner diameter of 13mm for accommodating the pressure valve guide rod 18. The thickness of the pressure valve guide rod sleeve 17 is 5mm. The difference between the inner diameter of the pressure guide rod receiving cavity and the outer diameter of the pressure valve guide rod 18 is 1mm. The pressure valve guide rod 18 is made of polyphenylene sulfide (PPS) and fiber (such as glass fiber or carbon fiber). Furthermore, the fiber content is not less than 30wt% to enhance the strength of the polyphenylene sulfide (PPS). The top of the pressure valve guide rod 18 is provided with a flat-head nut. The second solid membrane disc is below the flexible sealing diaphragm 1503. The fastening screw passes through the second solid membrane disc, the flexible sealing diaphragm 1503, the valve disc 202 of the pressure valve disc assembly 2, and is threadedly connected to the flat-head nut. When the pressure in the pressure chamber 101 is normal, the valve disc 202 of the pressure valve disc assembly 2 presses against the valve seat 201 of the pressure valve disc assembly 2 by its own weight. The flexible sealing diaphragm 1503 of the sealing structure 15 and the top of the annular sealing protrusion 1501 are in close contact and form an efficient seal. In this embodiment, the tank breather valve can adjust the opening pressure of the pressure valve disc assembly 2 by adjusting the counterweight 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, the pressure valve guide rod 18, the flexible sealing diaphragm 1503, the second solid film circular plate, the second flat-head nut, and the second counterweight plate of the pressure valve disc assembly 2.

[0137] In another embodiment, the single-slot positioning plate 19 in the tank breather valve is replaced with a cross positioning plate, and 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 bolt assembly. The width of the cross positioning plate is in the range of 5mm to 15mm, preferably 10mm, and the cross positioning plate and the pressure valve guide rod sleeve 17 are integrally formed.

[0138] Furthermore, the top of the pressure valve guide rod 18 is provided with a second limiting structure. 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 that the valve disc 202 of the pressure valve disc assembly 2 can rise to is called the maximum starting height of the valve disc 202 of the pressure valve disc assembly 2. The maximum starting height of the valve disc 202 of the pressure valve disc assembly 2 should meet the ventilation requirements of the breather valve of the storage tank and should be greater than 0.5D.

[0139] In one embodiment of the present invention, the valve seat 201 of the pressure valve disc assembly 2 is further provided with a first guide arc surface 203 and a second guide arc surface 204 located radially inner and radially outer of the annular sealing protrusion 1501, respectively. The first guide arc surface 203 and the second guide arc surface 204 are both smooth arc surfaces with a radius ranging from 1.6 mm to 2.4 mm. Preferably, the radius of the smooth arc surface is 2 mm. This arrangement can promptly guide the condensate that has accumulated on both radial sides of the annular sealing protrusion 1501 in the sealing structure 15 out, preventing the condensate from freezing at the location of the sealing structure 15 and freezing the valve seat 201 and the valve disc of the pressure valve disc assembly 2 together.

[0140] In one embodiment of the present invention, a flow guiding slope 205 is also formed on the valve seat 201 of the pressure valve disc assembly 2, and the flow guiding slope 205 gradually slopes downward in the radially outward direction of the valve seat 201.

[0141] Specifically, the guide slope 205 is a smooth slope, and the guide slope 205 gradually slopes downward in the radial outward direction of the valve seat 201, with an inclination angle ranging from 5° to 10°. Preferably, the inclination angle of the guide slope 205 is 7.5°. This arrangement can promptly guide the condensate flowing onto the guide slope 205 to the valve seat 201 of the pressure valve disc assembly 2, preventing condensate from accumulating on the valve seat 201 of the pressure valve disc assembly 2 and freezing.

[0142] In one embodiment of the present invention, a guide groove (not shown in the figure) is formed at the radial edge of the valve disc 202 of the pressure valve disc assembly 2. The opening of the guide groove faces downward. This arrangement facilitates the accumulation of condensate at the location of the guide groove and also facilitates the guidance of condensate 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 guide groove is annular, and the difference between the radius of the valve disc 202 of the pressure valve disc assembly 2 and the radius of the guide groove ranges from 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 guide groove is 7.5 mm.

[0143] In one embodiment of the present invention, the valve disc 202 of the pressure valve disc assembly 2 is made of polyphenylene sulfide (PPS), and the valve seat 201 of the pressure valve disc assembly 2 is made of stainless steel. The valve disc 202 of the pressure valve disc assembly 2, made of the above two materials respectively, can prevent the pressure valve disc assembly 2 of the tank breather valve from freezing at -50°C, and can effectively protect the valve disc 202 of the pressure valve disc assembly 2. Furthermore, the valve disc 202 of the pressure valve disc assembly 2 also includes fibrous material, such as glass fiber or carbon fiber with a content of not less than 30 wt%, to increase the strength of polyphenylene sulfide (PPS). Furthermore, the valve disc 202 of the pressure valve disc assembly 2 may also include polyethylene (POE) or ethylene propylene diene monomer (EPDM) rubber, with the content of polyethylene (POE) or EPDM rubber ranging from 3 to 15 wt%, to increase the toughness and low temperature resistance of the valve disc 202 of the pressure valve disc assembly 2.

[0144] In one embodiment of the present invention, the valve disc 202 of the vacuum valve disc assembly 3 is made of stainless steel, which has the advantages of being anti-crystallization and highly corrosion resistant, and can effectively protect the valve disc 202 of the vacuum valve disc assembly 3.

[0145] In another embodiment of the present invention, a storage tank is provided, the storage tank including a tank body and the aforementioned storage tank breathing valve for breathing the tank body.

[0146] The following embodiments further illustrate the tank breather valve and tank of the present invention. These embodiments are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operating procedures; however, the scope of protection of the present invention is not limited to the following embodiments.

[0147] Example 1

[0148] Taking the breather valve A1 of a 5000 cubic meter crude oil tank as an example (this breather valve A1 was tested for 24 hours at -30℃), the diameter of the interface flange at the bottom of the connecting seat 4 is DN200, the diameter of the cylinder part 112 (referring to the diameter of the cylinder part 112) is 500mm, and the overall height of the breather valve is 500mm. The diameter of the valve seat 201 of the pressure valve disc assembly 2 is 200mm, and the diameter of the valve disc 202 of the pressure valve disc assembly 2 is 260mm. The diameter of the valve seat 201 of the vacuum valve disc assembly 3 is 200mm, and the diameter of the valve disc 202 of the vacuum valve disc assembly 3 is 300mm. The opening pressures of the pressure valve disc assembly 2 and vacuum valve disc assembly 3 are changed by adjusting the counterweights 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 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 opening height of the valve disc 202 of the pressure valve disc assembly 2 is 60 mm. The pressure at which the valve disc 202 of the pressure valve disc assembly 2 reaches the maximum opening height is 1728 Pa, which is an overpressure of 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, and the lengths of the vacuum valve guide rod 16 and the vacuum valve guide rod sleeve 113 are set so that the maximum jump height of the valve disc 202 of the vacuum valve disc assembly 3 is 60 mm, the pressure of the valve disc 202 of the vacuum valve disc assembly 3 when it reaches the maximum jump height is -324 Pa, that is, 8% overpressure, and the reseating pressure of the valve disc 202 of the vacuum valve disc assembly 3 is -270 Pa.

[0149] When the gas pressure inside the crude oil tank is positive and exceeds the exhalation setting pressure of 1600 Pa for the tank's breather valve, the valve disc 202 of the pressure valve disc assembly 2 rises, connecting the inlet connecting channel 108 and the inlet / outlet airflow channel 106. When the pressure inside the crude oil tank exceeds 1728 Pa, the valve disc 202 of the pressure valve disc assembly 2 fully opens, and the gas inside the tank flows to the outside through the inlet connecting channel 108 and the inlet / outlet airflow channel 106. When the gas pressure inside the tank is lower than the reseating pressure of 1440 Pa for 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 an annular sealing protrusion 1501 on the valve disc 202 of the pressure valve disc assembly 2 cooperate to form a highly efficient seal, with a leakage rate not exceeding 0.0025 m³. 3 The leakage rate of / h meets the API 2000 standard (a standard issued by the American Petroleum Institute for the safety management of storage tank systems in the oil and gas industry) and is considered a low leakage rate.

[0150] When the gas inside the crude oil tank is under negative pressure and below the negative pressure setting pressure of -300Pa, the valve disc 202 of the vacuum valve disc assembly 3 rises, connecting the inlet / outlet airflow channel 106 and the inlet connecting channel 108. When the pressure inside the crude oil tank is below -324Pa, the valve disc 202 of the vacuum valve disc assembly 3 fully activates, allowing external gas to be drawn into the tank through the inlet / outlet airflow channel 106 and the inlet connecting channel 108, replenishing the tank pressure. When the gas pressure inside the tank exceeds the reseating pressure of the valve disc 202 of the vacuum valve disc assembly 3 (-270Pa), the valve disc 202 of the vacuum valve disc assembly 3 quickly reseats. 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 to form a highly efficient seal, with a leakage rate not exceeding 0.0025m. 3 / h, this leakage rate meets the API2000 standard and is considered a low leakage rate.

[0151] Example 2

[0152] Taking the breather valve A2 used in a 3000 cubic meter diesel tank as an example, the diameter of the interface flange at the bottom of the connecting seat 4 of this breather valve is selected as DN150. The gas pressure inside the diesel tank is set to positive pressure and exceeds the breather valve's exhalation setting pressure by 1000 Pa for testing. The test results show that under the above conditions, the leakage of the breather valve is no higher than 0.0015 m³. 3 / h, this leakage rate meets the API2000 standard and is considered a low leakage rate;

[0153] The gas inside the diesel storage tank was set to a negative pressure, 300 Pa lower than the set negative pressure, for testing. The test results showed that under these conditions, the leakage of the tank's breather valve was no higher than 0.0015 m³. 3 / h, this leakage rate meets the API2000 standard and is considered a low leakage rate. The other settings of the tank breather valve in Example 2 are the same as in Example 1, and will not be repeated here.

[0154] Example 3

[0155] Taking the breather valve A3, used in a 2000 cubic meter gasoline tank, as an example, the diameter of the interface flange at the bottom of the connecting seat 4 of this breather valve is DN100. A test was conducted with the gas pressure inside the gasoline tank set to positive pressure and exceeding the breather valve's exhalation setting pressure by 1000 Pa. The test results show that under these conditions, the leakage of the breather valve is no higher than 0.0015 m³. 3 / h, this leakage rate meets the API2000 standard and is considered a low leakage rate;

[0156] The gas inside the gasoline tank was set to a negative pressure, 300 Pa lower than the set negative pressure, and the test results showed that the leakage of the tank's breather valve was no higher than 0.0015 m³ under these conditions. 3 / h, this leakage rate meets the API2000 standard and is considered a low leakage rate. The other settings of the tank breather valve in Example 3 are the same as in Example 1, and will not be repeated here.

[0157] Example 4

[0158] Taking the breather valve A4 used in a 1000 cubic meter lubricating oil tank as an example, the diameter of the interface flange at the bottom of the connecting seat 4 of this breather valve is DN50. A test was conducted with the gas pressure inside the lubricating oil tank set to positive pressure and exceeding the breather valve's exhalation setting pressure by 800 Pa. The test results show that under these conditions, the leakage of the breather valve is no higher than 0.0015 m³. 3 / h, this leakage rate meets the API2000 standard and is considered a low leakage rate;

[0159] The gas inside the lubricating oil storage tank was set to a negative pressure, 300 Pa lower than the set negative pressure, for testing. The test results showed that under these conditions, the leakage of the tank's breather valve was no higher than 0.0015 m³. 3 / h, this leakage rate meets the API2000 standard and is considered a low leakage rate. The other settings of the tank breather valve in Example 4 are the same as in Example 1, and will not be repeated here.

[0160] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0161] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0162] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0163] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A tank breather valve, characterized in that The storage tank breather valve includes: The valve body (1) has a valve cavity inside which is divided into a pressure chamber (101) communicating with the tank body of the storage tank and a vacuum chamber (102) having an external communication port (104), the external communication port (104) opening downwards; and The valve disc assembly includes a pressure valve disc assembly (2) and a vacuum valve disc assembly (3) disposed axially spaced from each other in the valve chamber; The vacuum chamber (102) includes an intermediate spacer (105) between the pressure valve disc assembly (2) and the vacuum valve disc assembly (3) and an inlet / outlet airflow channel (106) connecting the external communication port (104) and the intermediate spacer (105). The inlet / outlet airflow channel (106) is vertically distributed and located outside the intermediate spacer (105).

2. A tank breather valve according to claim 1, characterised in that, The external communication port (104) is formed downward at the bottom of the valve cavity. In the radial direction of the valve body (1), the inlet and outlet airflow passage (106) is adjacent to the intermediate spacer cavity (105).

3. The tank breather valve of claim 1, wherein, The tank breathing valve also includes fins (12) disposed in the inlet and outlet airflow channels (106) and distributed downwardly; Optionally, the cross-section of the fin (12) is either straight or arc-shaped.

4. A tank breather valve according to any one of claims 1 to 3, characterised in that, The bottom end of the valve cavity is also formed with a storage tank connection port (103). The pressure chamber (101) includes an end cap cavity (107) between the top wall of the valve body (1) and the vacuum valve disc assembly (3) and an air inlet connection channel (108) connecting the storage tank connection port (103) and the end cap cavity (107). The air inlet connection channel (108) and the air inlet and outlet channels (106) are respectively arranged on the radial sides of the valve cavity.

5. A tank breather valve according to claim 4, wherein, The tank breather valve also includes: The connecting seat (4) is connected to the tank communication port (103) and forms a tank connection channel (109) for connecting the tank body; The pressure chamber (101) further includes an intermediate connecting chamber (110) formed between the connecting seat (4) and the pressure valve disc assembly (2), and the tank connecting channel (109), the intermediate connecting chamber (110), the air inlet connecting channel (108) and the end cover chamber (107) are connected in sequence.

6. A tank breather valve according to claim 5, wherein, The central axis of the intermediate partition cavity (105), the central axis of the intermediate connecting cavity (110), and the central axis of the tank connecting channel (109) coincide.

7. A tank breather valve according to claim 5 or 6, characterised in that, The tank breathing valve also includes a flame arrestor plate (13), which is located in the tank connection channel (109) or at the location of the external connection port.

8. A tank breather valve according to any one of claims 5 to 7, wherein The valve body (1) includes a cylindrical part (112) and an end cap part (111). The intermediate partition cavity (105), the inlet and outlet airflow passage (106), the inlet connecting passage (108), and the intermediate connecting cavity (110) are all formed inside the cylindrical part (112). The end cap part (111) covers the axial end of the cylindrical part (112) and forms the end cap cavity (107).

9. A tank breather valve according to claim 8, characterised in that, The tank breather valve also includes: A partition assembly is used to divide the valve cavity into individual chambers.

10. A tank breather valve according to claim 9, characterised in that, The partition assembly includes: A first arc plate (8) is disposed between the pressure valve disc assembly (2) and the vacuum valve disc assembly (3) for working together with the pressure valve disc assembly (2) and the vacuum valve disc assembly (3) to separate and form the intermediate spacer cavity (105) in the valve cavity.

11. A tank breather valve according to claim 10, wherein, The partition assembly also includes: The second arc plate (9) is disposed below the pressure valve disc assembly (2). On the horizontal plane, the second arc plate (9) is disposed opposite to the first arc plate (8). A connecting cylinder (10) is disposed 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) work together to separate and form the intermediate connecting cavity (110) within the valve cavity.

12. A tank breather valve according to claim 11, characterised in that, The partition assembly also includes: The first partition (5) has one side connected to the outer periphery of the vacuum valve disc assembly (3) and the other side connected to the inner periphery of the cylindrical part (112). The second partition (6) is disposed on the first end side of the first partition (5); The third partition (7) is disposed 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) work together to separate and form the inlet and outlet airflow channels (106) within the valve cavity.

13. A tank breather valve according to claim 12, characterised in that, The partition assembly also includes: A fourth partition (11) is disposed 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 cylinder part (112). It is used to work together with the second partition (6), the third partition (7) and the first arc plate (8) to separate and form the air intake communication channel (108) in the valve cavity.

14. A tank breather valve according to any one of claims 1 to 13, wherein Both the pressure valve disc assembly (2) and the vacuum valve disc assembly (3) have sealing structures (15) formed on them. 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).

15. A tank breather valve according to claim 14, characterised in that, 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), and the sealing structure (15) includes: An annular sealing protrusion (1501) is formed on the top of the valve seat (201); An annular groove (1502) is formed on the valve disc (202) and is vertically opposite to the annular sealing protrusion (1501); A flexible sealing diaphragm (1503) is disposed on the valve disc (202) and covers the annular groove (1502). In the closed and sealed state between the valve seat (201) and the valve disc (202), the annular sealing protrusion (1501) extends at least partially into the annular groove (1502). The flexible sealing diaphragm (1503), pushed by the protruding end of the annular sealing protrusion (1501), elastically extends toward the annular groove (1502).

16. A tank breather valve according to claim 15, characterised in that, The valve seat (201) of the pressure valve disc assembly (2) is further provided with a first guide arc surface (203) and a second guide arc surface (204) located radially inside the annular sealing protrusion (1501) and radially outside the annular sealing protrusion (1501), respectively.

17. A tank breather valve according to claim 15 or 16, characterised in that, The pressure valve disc assembly (2) also has a flow guide slope (205) formed on the valve seat (201), which gradually slopes downward in the radially outward direction of the valve seat (201).

18. A tank breather valve according to any one of claims 15 to 17, wherein, A guide groove is formed at the radial edge of the valve disc (202) of the pressure valve disc assembly (2).

19. A tank breather valve according to any one of claims 15 to 18, wherein, The flexible sealing diaphragm (1503) is made of perfluoroethylene-propylene copolymer, or, The flexible sealing diaphragm (1503) is a composite material consisting of a perfluoroethylene propylene copolymer sheet and a polyvinylidene fluoride rubber layer.

20. A tank breather valve according to any one of claims 15 to 19, wherein, The valve disc (202) of the pressure valve disc assembly (2) is made of polyphenylene sulfide.

21. A storage tank characterized by, The storage tank includes a tank body and a storage tank breather valve according to any one of claims 1-20.

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