Storage tank capable of preventing oil gas from being condensed

Abstract

The utility model discloses a storage tank capable of preventing oil gas condensation, which comprises a storage tank body used for storing oily substances; the breather valve is arranged on the storage tank body and comprises a valve body, a valve cavity with the bottom end in an opening shape is formed in the valve body, the interior of the valve cavity is divided into a pressure cavity communicating with the storage tank body and a vacuum cavity provided with an external communicating opening, and the external communicating opening faces downwards; the valve disc assembly comprises a pressure valve disc assembly and a vacuum valve disc assembly which are axially arranged in the radial middle part of 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 the external communicating port with the middle spacing cavity; and the fire retardant disc is arranged at the position where the external communication port is located. The storage tank has the advantages of high breathing smoothness and high safety.

Description

Technical Field

[0001] The present application belongs to the technical field of oil and gas storage, and specifically relates to a storage tank that prevents oil and gas condensation. Background Art

[0002] The breathing valve on the storage tank is an indispensable component, which can effectively prevent the storage tank from being deflated due to overpressure and negative pressure, and balance the overpressure and vacuum caused by the inflow and outflow and transfer of the medium in the tank.

[0003] When the substance stored in the storage tank is an oil product with easy-to-condense and high-viscosity characteristics, in order to ensure that it has a certain fluidity, its storage temperature is often required to be 3 to 5°C higher than its freezing point. At this time, the top of the storage tank is mostly volatile oil and gas of the easy-to-condense and high-viscosity oil product. Because the storage tank for easy-to-condense and high-viscosity oil products often needs to take heating measures, the oil and gas temperature is generally higher than the air temperature outside the tank. During the breathing process of the breathing valve, the volatile oil and gas of the easy-to-condense and high-viscosity oil products in the tank are exhaled. In the prior art, the breathing valve of the storage tank often sets a fire arrester disk inside the breathing valve. The above-mentioned easy-to-condense and high-viscosity oil and gas are easy to contact with the fire arrester disk. When the temperature inside the valve body drops below the freezing point of the easy-to-condense and high-viscosity oil, the oil and gas solidify, which can easily lead to poor breathing of the breathing valve and fail to ensure the safe operation of the storage tank. Utility Model Content

[0004] The purpose of the present application is to provide a storage tank that is resistant to oil and gas condensation, which has the advantages of high breathing smoothness and strong safety.

[0005] In order to achieve the above object, the present application provides a storage tank for preventing oil and gas condensation, the storage tank comprising:

[0006] The tank body is used to store oily substances;

[0007] The breathing valve is arranged on the tank body and comprises:

[0008] A valve body, wherein a valve cavity inside the valve body separates a pressure cavity communicated with the storage tank body and a vacuum cavity provided with an external communication port, wherein the external communication port opens downward;

[0009] The valve disc assembly comprises a pressure valve disc assembly and a vacuum valve disc assembly which are axially spaced from each other and arranged in the radial middle part of the valve cavity, and the vacuum cavity comprises an intermediate spacer cavity between the pressure valve disc assembly and the vacuum valve disc assembly and an inlet and outlet flow channel connecting the external communication port and the intermediate spacer cavity;

[0010] The fire-blocking disk is arranged at the location of the external communication port.

[0011] In an embodiment of the present application, a mounting groove is formed on the inner side wall at the location of the external communication port in the inlet and outlet air flow channel, and the fire-blocking disk is embedded in the mounting groove.

[0012] In an embodiment of the present application, the flame arrester plate is provided with mesh holes, and the number range of the mesh holes is 16 mesh - 22 mesh.

[0013] In an embodiment of the present application, the thickness range of the flame arrester plate is 3 mm - 7 mm.

[0014] In an embodiment of the present application, the 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 spacer cavity.

[0015] 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 both radial sides of the valve cavity.

[0016] In an embodiment of the present application, the valve body includes a cylindrical part and an end cover part. The intermediate spacer cavity, the air inlet and outlet flow passage, and the air inlet communication flow passage are all formed inside the cylindrical part. The end cover part covers the axial end of the cylindrical part and forms an end cover cavity.

[0017] In an embodiment of the present application, the breather valve further includes a heating coil arranged on the outer peripheral side of the cylindrical part.

[0018] In an embodiment of the present application, the breather valve further includes:

[0019] A connecting seat, and a storage tank connecting channel for connecting the storage tank body is formed inside the seat body;

[0020] Wherein, the pressure chamber further includes the storage tank connecting channel and an intermediate connecting cavity formed between the connecting seat and the pressure valve disc assembly. The storage tank connecting channel, the intermediate connecting cavity, the air inlet communication flow passage, and the end cover cavity are connected in sequence.

[0021] In an embodiment of the present application, an oil-repellent coating is provided on the inner cavity wall of the vacuum chamber.

[0022] As can be seen from the above technical solution, the storage tank includes: a storage tank body for storing oily substances; a breather valve provided on the storage tank body and including: a valve body, the valve cavity inside the valve body being partitioned into a pressure cavity communicating with the storage tank body and a vacuum cavity provided with an external communication port, the external communication port being formed at the bottom end of the valve cavity with an opening facing downward; a valve disc assembly including a pressure valve disc assembly and a vacuum valve disc assembly axially spaced apart from each other in the radial middle part of the valve cavity, the vacuum cavity including an intermediate spacer cavity between the pressure valve disc assembly and the vacuum valve disc assembly and an air inlet / outlet passage communicating from the external communication port to the intermediate spacer cavity; a flame arrester disc provided at the position where the external communication port is located. In this embodiment, this arrangement of the flame arrester disc extends the outflow path of the oily gas exhaled by the breather valve, which is beneficial to reducing the possibility of the oily gas accumulating and condensing at the flame arrester disc, thereby ensuring the smooth breathing of the breather valve and the storage tank, and being beneficial to improving the use safety of the breather valve and the storage tank.

[0023] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent specific embodiment part. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings are used to provide a further understanding of the embodiments of the present application, and constitute a part of the specification, and are used together with the following specific embodiments 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, other drawings can be obtained based on the structures shown in these drawings without creative efforts. In the drawings:

[0025] Figure 1 is the first sectional view of the breather valve in the embodiment of the present utility model;

[0026] Figure 2 is the second sectional view of the breather valve in the embodiment of the present utility model;

[0027] Figure 3 is Figure 2 the partial enlarged view at A in

[0028] Figure 4 is Figure 2 the partial enlarged view at B in

[0029] Figure 5 is the overall structure diagram of the breather valve in the embodiment of the present utility model;

[0030] Figure 6 is the first perspective sectional view of the valve body in the embodiment of the present utility model;

[0031] Figure 7 is the second perspective sectional view of the valve body in the embodiment of the present utility model;

[0032] Figure 8 It is the third - perspective sectional view of the valve body in the embodiment of the present utility model;

[0033] Figure 9 It is the fourth - perspective sectional view of the valve body in the embodiment of the present utility model;

[0034] Figure 10 It is the first - perspective structural view of the valve body in the embodiment of the present utility model;

[0035] Figure 11 It is the second - perspective structural view of the valve body in the embodiment of the present utility model;

[0036] Figure 12 It is the structural schematic diagram of the sealing structure on the pressure valve disc assembly in the embodiment of the present utility model;

[0037] Figure 13 It is the structural schematic diagram of the sealing structure on the vacuum valve disc assembly in the embodiment of the present utility model.

[0038] Explanation of reference numerals

[0039] 1 Valve body 101 Pressure cavity

[0040] 102 Vacuum cavity 103 Storage tank connection port

[0041] 104 External connection port 105 Intermediate spacer cavity

[0042] 106 In - and - out air flow channel 107 End - cover cavity

[0043] 108 Intake connection flow channel 109 Storage tank connection channel

[0044] 110 Intermediate connection cavity 111 End - cover part

[0045] 112 Cylindrical part 113 Vacuum valve guide rod sleeve

[0046] 2 Pressure valve disc assembly 201 Valve seat

[0047] 202 Valve disc 203 First flow - guiding arc surface

[0048] 204 Second flow - guiding arc surface 205 Flow - guiding inclined surface

[0049] 206 Pressure - side valve hole 3 Vacuum valve disc assembly

[0050] 301 Vacuum - side valve hole 4 Connection seat

[0051] 5 First partition 6 Second partition

[0052] 7 Third partition 8 First circular arc plate

[0053] 801 First side opening 9 Second arc plate

[0054] 901 Second side opening 10 Connecting cylinder

[0055] 11 Fourth partition plate 12 Fins

[0056] 13 Flame arrestor disc 14 Heat tracing coil

[0057] 15 Sealing structure 1501 Annular sealing projection

[0058] 1502 Annular groove 1503 Flexible sealing diaphragm

[0059] 16 Vacuum valve guide rod 17 Pressure valve guide rod sleeve

[0060] 18 Pressure valve guide rod 19 One - character positioning plate Specific embodiments

[0061] 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 intended to limit the present application.

[0062] In an embodiment of the present application, a storage tank for preventing oil - gas condensation is provided. The storage tank includes:

[0063] A storage tank body for storing oily substances;

[0064] A breather valve provided on the storage tank body and including:

[0065] A valve body 1, in which a valve cavity inside the valve body 1 is divided into a pressure chamber 101 communicating with the storage tank body and a vacuum chamber 102 provided with an external communication port 104, and the opening of the external communication port 104 faces downward;

[0066] A valve disc assembly including a pressure valve disc assembly 2 and a vacuum valve disc assembly 3 axially spaced from each other and provided at the radial middle part of the valve cavity. The vacuum chamber 102 includes an intermediate interval chamber 105 between the pressure valve disc assembly 2 and the vacuum valve disc assembly 3 and an air inlet - outlet flow channel 106 communicating the external communication port 104 with the intermediate interval chamber 105;

[0067] A flame arrestor disc 13 provided at the position where the external communication port 104 is located.

[0068] 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 provided on the peripheral wall of the cylindrical portion and is distributed in the horizontal direction. The vertical connection portion is distributed vertically 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 formed inside the vertical connection portion, and the external communication port 104 is formed at the bottom of the vertical connection portion. The temperature of the oily substance inside the storage tank body is 3°C to 5°C higher than its freezing point. When the breather valve in this embodiment is in a cold working environment (such as -20°C to -50°C), the flame arrester disc 13 in this embodiment covers the external communication port 104 in the horizontal direction. The external first gas (such as air) enters the air inlet and outlet passage 106 through the external communication port 104, then flows through the air inlet and outlet passage 106 into the cavity in the horizontal connection portion, 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 (that is, when the internal pressure of the storage tank body is lower than the suction pressure), the vacuum valve disc assembly 3 will have a lifting phenomenon. At this time, the external first gas enters the pressure chamber 101 and the storage tank body from the intermediate spacer chamber 105; when the breather valve in this embodiment needs to exhale (that is, the internal pressure of the storage tank body exceeds the exhale pressure), the pressure valve disc assembly 2 has a lifting phenomenon. The second gas (such as oily gas) exhaled from the storage tank body 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. This setting method of the flame arrester disc 13 in this embodiment extends the outflow path of the oily gas exhaled by the breather valve, which is beneficial to reducing the possibility of the oily gas accumulating and condensing at the flame arrester disc 13, thereby ensuring the smooth breathing of the breather valve and the storage tank, and being beneficial to improving the use safety of the breather valve and the storage tank.

[0069] In an embodiment of the present application, an installation groove is formed on the inner side wall of the air inlet and outlet passage 106 at the position where the external communication port 104 is located. The flame arrester disc 13 is embedded in the installation groove. The top wall and the bottom wall of the installation groove both play a role in stopping the flame arrester disc 13, preventing the flame arrester disc 13 from falling off from the installation groove, ensuring the installation stability of the flame arrester disc 13, and enabling the flame arrester disc 13 to play a good flame retardant performance.

[0070] In an embodiment of the present application, the flame arrester disc 13 is provided with mesh holes, and the number range of the mesh holes is 16 meshes - 22 meshes. Specifically, the radial dimension of the flame arrester disc 13 is determined according to the dimension of the air inlet and outlet passage 106. In this embodiment, the flame arrester disc 13 is preferably a metal mesh type flame arrester disc, and the mesh holes are provided on the flame retardant layer of the metal mesh type flame arrester disc. Further, the number of the mesh holes is preferably 20 meshes. The above number of mesh holes can ensure that the breather valve has sufficient ventilation volume.

[0071] In an embodiment of the present application, the thickness range of the flame arrester disc 13 is 3 mm - 7 mm. Further, in this embodiment, the thickness of the flame arrester disc 13 is preferably 5 mm. The flame arrester disc 13 with this thickness value has sufficient strength and can avoid waste of manufacturing materials.

[0072] In another embodiment of the present application, as Figures 1-2 and Figures 5-11 shown, the external communication port 104 is formed at the bottom end of the valve cavity with the opening facing downward, and the inlet and outlet air flow channels 106 are distributed vertically. In the radial direction of the valve body 1, the inlet and outlet air flow channels 106 are located outside the intermediate partition cavity 105 and are adjacent to the intermediate partition cavity 105.

[0073] Specifically, therefore, the first gas from the outside (which may contain rain, snow or sand particles) has to move upward from the bottom after passing through the external communication port 104 and enter the inlet and outlet air flow channels 106 (during this process, the external force on the first gas decreases, and some rain, snow or sand particles may fall under the action of gravity and drop outside the breather valve). It moves upward to the top of the inlet and outlet air flow channels 106, changes the flow direction, and then enters the intermediate partition 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 (i.e., the internal pressure of the tank exceeds the exhaling pressure), the pressure valve disc assembly 2 has a lifting phenomenon, and the gas in the pressure cavity 101 enters the intermediate partition cavity 105 and then flows to the outside through the inlet and outlet air flow channels 106. Compared with the situation where rain, snow or sand particles directly enter the inside of the breather valve from the top or the lateral side of the valve body 1, the breather valve in this embodiment increases the difficulty for the first gas containing rain, snow or sand particles to enter the pressure cavity 101 from the outside and can avoid blockage inside the breather valve. In addition, the above arrangement can also make the layout inside the valve body 1 more compact, which is beneficial to reducing the overall volume of the breather valve and conducive to realizing the miniaturized design of the breather valve.

[0074] In an embodiment of the present application, a storage tank communication port 103 (the opening of the storage tank communication port 103 faces downward) is further 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 intake communication flow channel 108 connecting the storage tank communication port 103 and the end cover cavity 107. The intake communication flow channel 108 and the inlet and outlet air flow channels 106 are respectively arranged on the two radial sides of the valve cavity.

[0075] Specifically, the temperature of the storage medium inside the storage tank body is 3°C to 5°C higher than its freezing point. When the 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 breather valve is hot air. After the vacuum valve disc assembly 3 has a lifting phenomenon, after the vacuum valve disc assembly 3 has lifted, the first gas from the outside enters the end cap cavity 107 and the intake connection flow channel 108 from the intermediate spacer cavity 105, and then enters the storage 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 cap cavity 107 is at the top 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 storage tank body. And since the inlet and outlet flow channels 106 and the intake connection flow channel 108 are respectively on the radial two sides of the valve cavity, the first gas has to go around from one radial side of the cylindrical part 112 to the other radial side when entering the storage tank body from the outside, with a relatively long passing path and the need to change the flow direction multiple times, further greatly increasing the difficulty for the first gas to enter the storage tank body from the outside, which is beneficial to making the first gas entering the storage tank body more gentle, and then making the pressure valve disc assembly 2 less likely to have a lifting phenomenon to reduce 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, further improving the working reliability and use safety of the breather valve.

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

[0077] In an embodiment of the present application, the valve body 1 includes a cylindrical part 112 and an end cap part 111. The intermediate spacer cavity 105, the inlet and outlet flow channels 106, and the intake connection flow channel 108 are all formed inside the cylindrical part 112, and the end cap part 111 covers the axial end of the cylindrical part 112 and forms an end cap cavity 107.

[0078] Specifically, the end cap cavity 107 is recessed upward from the bottom surface of the end cap part 111. The end cap part 111 and the top of the cylindrical part 112 are cooperated through bolts or snap structures. Preferably, the end cap part 111 is fixed on the cylindrical part 112 through a snap structure to make the two form a stable and good cooperation; further, the corner connection between the top wall of the end cap cavity 107 and the peripheral wall of the end cap cavity 107 is formed as a smooth arc transition, and the radius range of the arc here 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 is the radius of the end cover part 111. This setting can not only improve the stress concentration of the end cover part 111 and the breather valve, but also optimize the fluidity of the gas in the end cover cavity 107.

[0079] In an embodiment of the present application, the breather valve further includes a tracing coil 14 arranged on the outer peripheral side of the cylinder part 112.

[0080] Specifically, both ends of the tracing coil 14 are provided with a tracing medium inlet and a tracing medium outlet. The tracing medium in this embodiment is preferably steam. This setting further ensures that the interior of the breather valve has a sufficiently high temperature to prevent the oily gas from solidifying inside the breather valve.

[0081] In an embodiment of the present application, the breather valve further includes:

[0082] A connection seat 4, which is docked with the storage tank communication port 103 and forms a storage tank connection channel 109 for connecting the storage tank body;

[0083] Among them, the pressure chamber 101 further includes the storage tank connection channel 109 and an intermediate connection chamber 110 formed between the connection seat 4 and the pressure valve disc assembly 2. The storage tank connection channel 109, the intermediate connection chamber 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 chamber 110, the intermediate interval chamber 105 and the end cover cavity 107 are sequentially distributed along the axial direction from the first axial end to the second axial end.

[0084] Specifically, the upper end of the connection seat 4 is connected to the valve body 1 through a bolt or buckle structure. The storage tank communication port 103 is formed at the bottom end of the intermediate connection chamber 110. One end of the storage tank connection channel 109 far from the storage tank body is connected to the intermediate connection chamber 110. In the lifting state of the vacuum valve disc assembly 3, the external first gas first enters the end cover cavity 107 from the intermediate interval chamber 105, and then passes through the intake connection flow channel 108, the intermediate connection chamber 110 and the storage tank connection channel 109 and then enters the storage tank body. The above setting extends the flow path of the first gas entering the storage tank body, improves the smoothness of the first gas flow, enables the first gas to enter the storage tank body more smoothly, reduces the disturbance of the gas in the storage tank body, and further makes the breathing of the breather valve more stable, which is beneficial to further ensuring the use reliability of the breather valve.

[0085] In an embodiment of the present application, the breather valve further includes a tracing jacket arranged on the outer peripheral side of the connection seat 4.

[0086] Specifically, a heat preservation 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 heat preservation cavity. The oily substance (with a relatively high temperature) in the storage tank body or steam can be used for heat tracing, so as to keep the breather valve at a relatively high temperature and prevent the oily gas from condensing inside the breather valve and sticking to the breather valve.

[0087] In an embodiment of the present application, an oil-repellent coating is provided on the inner cavity wall of the vacuum cavity 102.

[0088] 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 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 stored substance in the storage tank body is an oily substance, an oil-repellent coating is provided on the inner cavity wall of the vacuum cavity 102. The oil-repellent coating in this embodiment is a nano-coating (or other oil-repellent and water-repellent material coatings). The nano-coating utilizes the introduction of surface rheological property changes and the formation of nano-structures by nano-materials, and has good water-repellent and oil-repellent properties, as well as high temperature resistance and corrosion resistance. The above setting can prevent the oily gas volatilized at high temperature in the storage tank body from cooling and solidifying on the inner cavity wall of the vacuum cavity 102 to form sticky oil products, thereby avoiding the abnormal operation of the pressure valve disc assembly 2.

[0089] In an embodiment of the present application, the central axis of the intermediate interval cavity 105, the central axis of the intermediate connection cavity 110, and the central axis of the storage tank connection channel 109 coincide.

[0090] Specifically, an interface flange part for connecting the storage 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 inside of the breather valve is provided on the interface flange part. The selection of the breather valve model is related to the volume of the storage tank body and the breathing gas volume per unit time. In this embodiment, the diameter of the interface flange part is the breather valve model size. The above setting can make the flow field inside the valve body 1 more evenly distributed, which is beneficial to reducing the tremor of the breather valve.

[0091] In an embodiment of the present application, as Figures 5-11 shown, the breather valve further includes:

[0092] A partition plate assembly for partitioning and forming each chamber in the valve cavity. Specifically, the partition plate assembly includes:

[0093] A first arc plate 8, arranged between the pressure valve disc assembly 2 and the vacuum valve disc assembly 3, and used to cooperate with the pressure valve disc assembly 2 and the vacuum valve disc assembly 3 to partition and form an intermediate interval cavity 105 in the valve cavity;

[0094] A second arc plate 9, 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;

[0095] 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 act together to separate and form an intermediate connection cavity 110 in the valve cavity;

[0096] The first partition plate 5, one side of the first partition plate 5 is connected to the outer peripheral edge of the vacuum valve disc assembly 3, and the other side of the first partition plate 5 is connected to the inner peripheral wall of the cylinder part 112;

[0097] The second partition plate 6 is arranged on the first end side of the first partition plate 5;

[0098] The third partition plate 7 is arranged on the second end side of the first partition plate 5. The first partition plate 5, the second partition plate 6, the third partition plate 7, the second arc plate 9 and the connecting cylinder 10 act together to separate and form an air inlet and outlet flow channel 106 in the valve cavity;

[0099] The fourth partition plate 11 is arranged above the connecting cylinder 10. One side of the fourth partition plate 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 plate 11 is connected to the inner peripheral wall of the cylinder part 112, and is used to act together with the second partition plate 6, the third partition plate 7 and the first arc plate 8 to separate and form an air inlet connecting flow channel 108 in the valve cavity.

[0100] In this embodiment, both the first partition plate 5 and the fourth partition plate 11 are arranged in the horizontal direction and are arc-shaped. The first partition plate 5 and the fourth partition plate 11 are respectively on the radial two sides of the connecting cylinder 10. The second partition plate 6, the third partition plate 7, the first arc plate 8 and the second arc plate 9 are all arranged in the vertical direction. The vertical two ends of the second partition plate 6 are respectively connected to the first end side of the first partition plate 5 and the first end side of the fourth partition plate 11. The vertical two ends of the third partition plate 7 are respectively connected to the second end side of the first partition plate 5 and the second end side of the fourth partition plate 11; A first side opening 801 communicating the air inlet and outlet flow 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 flow channel 108 and the intermediate connection cavity 110 is formed between the circumferential two ends of the second arc plate 9.

[0101] In an embodiment of the present application, the breathing valve further includes fins 12 arranged in the air inlet and outlet flow channel 106 and distributed obliquely downward;

[0102] Optionally, the cross section of the fins 12 is linear or arc-shaped.

[0103] Specifically, in this embodiment, the number of fins 12 can be multiple (such as 2, 3, 4 or other numbers). The multiple fins 12 are sequentially arranged on the inner peripheral wall of the cylindrical body portion 112, the outer side wall of the second arc plate 9, and the outer side wall of the connecting cylinder 10 in an interlaced manner. The distance between two vertically adjacent fins 12 meets the ventilation requirement of the breather valve. The arrangement of the fins 12 can not only increase the difficulty for the first gas to enter the inlet and outlet air flow channels 106 and the intermediate spacer cavity 105 from the outside, that is, it can block rain, snow or sand carried in the first gas during the inhalation process of the breather valve; further, the multiple fins 12 are arranged at intervals in the vertically distributed inlet and outlet air flow channels 106, which reduces the upward movement power of rain, snow or sand (compared with the outside, less first gas enters the inlet and outlet air flow channels 106, so the upward power of rain, snow or sand carried in the first gas is reduced), and the gravity of the above rain, snow or sand remains unchanged, so the difficulty for the rain, snow or sand carried in the first gas to move upward increases. In addition, it also increases the probability that the rain, snow or sand collides with the fins 12 and falls after entering the inlet and outlet air flow channels 106 and separates from the first gas, further increasing the difficulty for the rain, snow or sand carried in the first gas to move to the intermediate spacer cavity 105, which is beneficial to reducing the amount of rain, snow or sand entering the interior of the breather valve, and further can alleviate or avoid the situation of rain, snow and sand blocking the interior of the breather valve; it can also guide the gas when it flows out of the breather valve, so that the second gas exhaled from the breather valve can flow out quickly (that is, this arrangement of the fins 12 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 breather valve exhales, the first gas in the intermediate spacer cavity 105 meets the exhaled second gas and generates condensate. The arrangement of the fins 12 can quickly guide the above condensate flowing out to the inlet and outlet air flow channels 106 to the outside of the breather valve.

[0104] Further, 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. The included angle range 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 is 40° - 50°, such as the included angle range 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 is 40°, 42°, 45°, 47° or 50°. Preferably, the above included angle is 45° for changing the flow direction of the first gas flowing in or the second gas flowing out. In this embodiment, the cross-section of the fin 12 is preferably arc-shaped, and the arc is 1 / 6 of a complete circle. The thickness of the fin 12 is 5 mm, which is beneficial to further improving the condensate drainage capacity.

[0105] 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.

[0106] In an embodiment of the present application, as Figures 2-3 and Figures 12-13 shown, sealing structures 15 are formed on both the pressure valve disc assembly 2 and the vacuum valve disc assembly 3, 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 (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:

[0107] An annular sealing protrusion 1501 formed on the top of the valve seat 201;

[0108] An annular groove 1502 formed on the valve disc and vertically opposite to the annular sealing protrusion 1501;

[0109] A flexible sealing diaphragm 1503 disposed on the valve disc and covering the annular groove 1502. In the state where the valve seat 201 and the valve disc are in sealing fit, 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.

[0110] 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 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 at least partially extend upward into the annular groove 1502. At this time, the annular sealing protrusion 1501 and the flexible sealing diaphragm 1503 form the sealing structure 15. Further, since the intermediate spacer cavity 105 communicates with the outside, the outside first gas easily enters the inside of the breathing valve during the inhalation process of the breathing valve, and no condensate is generated on the vacuum valve disc assembly 3. Therefore, two sets of sealing structures 15 are provided on the vacuum valve disc assembly 3 to ensure that the breathing 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 breathing valve, the second gas exhaled from the storage tank body and the first gas are likely to generate condensate when they meet. 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 structures 15 can be provided on the pressure valve disc assembly 2.

[0111] In this embodiment, the setting of the sealing structure 15 can not only ensure the sealing performance of the breather valve, effectively reduce the probability of leakage of the breather valve, but also further reduce the possibility of icing and frosting of the pressure valve disc assembly 2, further improving the safety performance and environmental protection performance of the breather valve, which is beneficial to ensuring personal safety and property safety.

[0112] Furthermore, the height range of the valve seat 201 of the pressure valve disc assembly 2 is 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; the height range of the annular sealing protrusion 1501 of the sealing structure 15 is 3 mm to 3.4 mm. Preferably, the height of the annular sealing protrusion 1501 of the sealing structure 15 is 3.2 mm, and the inner angle of the annular sealing protrusion 1501 of the sealing structure 15 is 60°.

[0113] In an embodiment of the present application, the flexible sealing diaphragm 1503 is a component made of perfluoroethylene propylene copolymer, 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, the thickness of the flexible sealing diaphragm 1503 in this embodiment is 1.5 mm so that the flexible sealing diaphragm 1503 has a certain hardness.

[0114] In another embodiment of the present application, the flexible sealing diaphragm 1503 is a composite component of a perfluoroethylene propylene copolymer layer and a vinylidene fluoride ether rubber layer. The above flexible sealing diaphragm 1503 can be obtained by bonding the perfluoroethylene propylene copolymer layer and the vinylidene fluoride ether rubber layer, and then subjecting the bond of the perfluoroethylene propylene copolymer layer and the vinylidene fluoride ether rubber layer to vacuum pressing.

[0115] The flexible sealing diaphragm 1503 prepared by the above method can delay the freezing time and reduce the adhesion strength of the ice layer in the breather valve, enabling the breather valve to 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 breather valve from 0.85 times the opening pressure to below the opening pressure (that is, the multiple range is from 0.85 times to 1 times the opening pressure), thereby reducing the leakage amount of the breather valve. Perfluoroethylene propylene copolymer and vinylidene fluoride ether rubber can be commercially obtained.

[0116] Further, 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 ranges from 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.

[0117] Further, 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 ranges from 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 facilitates the installation and maintenance of the valve disc 202 of the pressure valve disc assembly 2 by removing the end cover part 111.

[0118] 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 sufficient strength of the valve seat 201 of the vacuum valve disc assembly 3; the height of the annular sealing projection 1501 ranges from 3 mm to 3.4 mm. For example, the height of the annular sealing projection 1501 is 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, or 3.4 mm. Preferably, the height of the annular sealing projection 1501 is 3.2 mm, and the inner angle of the annular sealing projection 1501 is 60°. In addition, the distance between the two sealing structures 15 on the vacuum valve disc assembly 3 is 8 mm.

[0119] Further, the inner diameter of the cylindrical part 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 part 112 and the radius of the valve seat 201 of the vacuum valve disc assembly 3 ranges from 15 mm to 25 mm. For example, the difference between the inner diameter of the cylindrical 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.

[0120] Further, the thickness ranges of the first arc plate 8, the second arc plate 9, and the connecting cylinder 10 are all from 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 breather valve and the structure and strength of the breather valve.

[0121] Further, in the vacuum valve disc assembly 3, the range of the difference 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.

[0122] 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 cylindrical body portion 112 coincide. This setting can make the flow field inside the cylindrical body portion 112 more evenly distributed, which is beneficial to reducing the tremor of the breather valve.

[0123] Further, the inner diameter of the cylindrical body portion 112 is determined according to the ventilation volume of the breather valve. Specifically, the inner diameter of the cylindrical body portion 112 is determined according to the following formula:

[0124]

[0125] wherein, D1 is the inner diameter of the cylindrical body portion 112, D2 is the diameter of the intermediate spacer cavity 105 or the diameter of the intermediate connection cavity 110 (in this embodiment, the diameters of the intermediate spacer cavity 105 and the intermediate connection cavity 110 are the same), and D is the diameter of the connection port where the storage tank connection channel 109 is connected to the storage tank body, and the units are all mm.

[0126] Further, the thickness range of the cylindrical body portion 112 is 4 mm to 6 mm. Preferably, in this embodiment, the thickness of the cylindrical body portion 112 is 5 mm, so as to balance the processing cost of the breather valve and the structure and strength of the breather valve.

[0127] Further, the breathing 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. An upwardly extending vacuum valve guide rod sleeve 113 is formed on the end cover portion 111. A vacuum guide rod receiving cavity for receiving the vacuum valve guide rod 16 and having 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 receiving cavity and the outer diameter of the vacuum valve guide rod 16 is 1 mm. When the pressure in the intermediate spacer 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 projection 1501 to form an efficient seal. The breathing valve in this embodiment can adjust the popping 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.

[0128] Further, 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 popping height of the valve disc 202 of the vacuum valve disc assembly 3. The maximum popping height of the valve disc 202 of the vacuum valve disc assembly 3 should meet the breathing valve ventilation volume requirement and should be greater than 0.5D.

[0129] Further, the breathing 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 fibrous bodies (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. 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 for threaded connection.

[0130] 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 breathing valve in this embodiment can adjust the opening 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.

[0131] In another embodiment, the one-word positioning plate 19 in the breathing 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.

[0132] 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 opening height of the valve disc 202 of the pressure valve disc assembly 2. The maximum opening height of the valve disc 202 of the pressure valve disc assembly 2 should meet the air ventilation requirement of the breathing valve and should be greater than 0.5D.

[0133] In an embodiment of the present application, a first flow guiding arc surface 203 and a second flow guiding 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 flow guiding arc surface 203 and the second flow guiding 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 guide away the second gas (oily gas) passing through the position of the sealing structure 15 of the pressure valve disc assembly 2, avoiding the condensation of the second gas (oily gas) at the position of the sealing structure 15 and sticking the valve seat 201 and the valve disc 202 of the pressure valve disc assembly 2 together.

[0134] In an embodiment of the present application, a flow guiding inclined surface 205 is further formed on the valve seat 201 of the pressure valve disc assembly 2, and the flow guiding inclined surface 205 gradually slopes downward in the radially outward direction of the valve seat 201.

[0135] Specifically, the flow guiding inclined surface 205 is a smooth inclined surface, and the flow guiding 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 flow guiding inclined surface 205 is 7.5°. This setting can timely guide away the second gas (oily gas) flowing onto the flow guiding inclined surface 205, avoiding the accumulation, condensation, and sticking of the second gas (oily gas) on the valve seat 201 of the pressure valve disc assembly 2.

[0136] In an embodiment of the present application, a flow guiding 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 flow guiding groove faces downward. This setting not only facilitates the accumulation of the condensed oily substance at the position of the flow guiding groove but also facilitates guiding the condensed oily substance to the outside of the valve disc 202, further reducing the possibility of the valve disc 202 and the valve seat 201 of the pressure valve disc assembly 2 sticking together. Further, the flow guiding 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 flow guiding 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 flow guiding groove is 7.5 mm.

[0137] In an embodiment of the present application, the material for manufacturing 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 breather valve from freezing in an environment of -50°C, effectively protecting the valve disc 202 of the pressure valve disc assembly 2. Further, the material for manufacturing 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%, which is used to increase the strength of polyphenylene sulfide (PPS). Further, the material for manufacturing the valve disc 202 of the pressure valve disc assembly 2 may further include polyethylene (POE) or ethylene propylene diene monomer (EPDM) with a content of not less than 3% to 15 wt%, which increases the toughness and low-temperature resistance of the valve disc 202 of the pressure valve disc assembly 2.

[0138] In an embodiment of the present application, the material for manufacturing the valve disc 202 of the vacuum valve disc assembly 3 is stainless steel, which has the advantages of anti-crystallization and strong corrosion resistance, effectively protecting the valve disc 202 of the vacuum valve disc assembly 3.

[0139] The following is to further illustrate the oil and gas condensation prevention storage tank of the present application 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, but the protection scope of the present application is not limited to the following embodiments.

[0140] Embodiment 1

[0141] Taking the breather valve A1 applied to a 5000-cubic crude oil storage tank as an example (this breather valve A1 is 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 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 lifting 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 lifting 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 lifting 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 lifting 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.

[0142] When the gas pressure in the crude oil storage tank body is positive pressure and exceeds the exhalation set pressure of 1600 Pa of the breather valve, the valve disc 202 of the pressure valve disc assembly 2 rises upward, and the intake connection flow channel 108 is connected to the inlet and outlet air flow channel 106. When the pressure in the crude oil storage tank body exceeds 1728 Pa, the valve disc 202 of the pressure valve disc assembly 2 fully lifts off. The gas in the storage tank body 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 storage tank body 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.

[0143] When the gas inside the crude oil storage tank is under negative pressure and lower than the negative pressure set value 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 inside the crude oil storage 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 storage tank through the air inlet and outlet flow channel 106 via the air inlet connecting flow channel 108 to supplement the pressure inside the storage tank. When the gas pressure inside the storage 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.

[0144] Example 2

[0145] Taking the breather valve A2 applied to a 3000-cubic diesel storage tank as an example, the diameter of the interface flange part at the bottom of the connecting seat 4 of this breather valve is selected as DN150. The gas pressure inside the diesel storage tank is set as positive pressure and exceeds the exhalation set pressure of the breather valve by 1000 Pa for testing. The test results show that the leakage rate of the breather 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;

[0146] The gas inside the diesel storage tank is set as negative pressure and lower than the negative pressure set value of -300 Pa for testing. The test results show that the leakage rate of the breather 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 breather valve in Example 2 are the same as those in Example 1 and will not be elaborated here.

[0147] Example 3

[0148] Taking the integrated breather valve A3 applied to a 2000-cubic gasoline storage tank as an example, the diameter of the interface flange part at the bottom of the connecting seat 4 of this breather valve is DN100. The gas pressure inside the gasoline storage tank is set as positive pressure and exceeds the exhalation set pressure of the breather valve by 1000 Pa for testing. The test results show that the leakage rate of the breather 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;

[0149] The gas inside the gasoline storage tank is set as negative pressure and lower than the negative pressure set value of -300 Pa for testing. The test results show that the leakage rate of the breather valve in the above situation is not higher than 0.0015 m 3 / h. This leakage rate meets the API2000 standard and belongs to low leakage. The other settings of the breather valve in Example 3 are the same as those in Example 1 and will not be elaborated here.

[0150] Example 4

[0151] Taking the breather valve A4 applied to a 1000-cubic lubricating oil storage tank as an example, the diameter of the interface flange part at the bottom of the connecting seat 4 of this 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 breather valve by 800 Pa for testing. The test results show that the leakage rate of the breather valve in the above situation is not higher than 0.0015 m 3 / h. This leakage rate meets the API2000 standard and belongs to low leakage;

[0152] The gas in the lubricating oil storage tank body 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 breather valve in the above situation is not higher than 0.0015 m 3 / h. This leakage rate meets the API2000 standard and belongs to low leakage. The other settings of the breather valve in Example 4 are the same as those in Example 1 and will not be elaborated here.

[0153] 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 construed 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, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0154] In the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected with", "fixed" and other terms 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 communication with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it 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.

[0155] In the description of this specification, the descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean 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 representations 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 any one or more embodiments or examples in a suitable manner. 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.

[0156] 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. An oil and gas condensation-proof storage tank, characterized in that, The oil and gas condensation prevention storage tank includes: A storage tank body for storing oily substances; A breather valve provided on the storage tank body and including: A valve body (1), in which a valve chamber inside the valve body (1) is partitioned into a pressure chamber (101) communicating with the storage tank body and a vacuum chamber (102) provided with an external communication port (104), and the opening of the external communication port (104) faces downward; A valve disc assembly including a pressure valve disc assembly (2) and a vacuum valve disc assembly (3) axially spaced from each other at a radial middle part of the valve chamber. 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 and outlet flow channel (106) communicating the external communication port (104) with the intermediate spacer chamber (105); A flame arrester disc (13) provided at the position of the external communication port (104).

2. The storage tank for preventing oil and gas condensation according to claim 1, wherein An installation groove is formed on an inner side wall at the position of the external communication port (104) in the air inlet and outlet flow channel (106), and the flame arrester disc (13) is embedded in the installation groove.

3. The storage tank for preventing oil and gas condensation according to claim 1, characterized in that, The flame arrester disc (13) is provided with mesh holes, and the number range of the mesh holes is 16 mesh - 22 mesh.

4. The storage tank for preventing oil and gas condensation according to claim 1, wherein The thickness range of the flame arrester disc (13) is 3 mm - 7 mm.

5. The storage tank for preventing oil and gas condensation according to claim 1, wherein The external communication port (104) is formed at the bottom end of the valve chamber with the opening facing downward. In the radial direction of the valve body (1), the air inlet and outlet flow channel (106) is adjacent to the intermediate spacer chamber (105).

6. The storage tank for preventing oil and gas condensation according to claim 5, wherein, A storage tank communication port (103) is further formed at the bottom end of the valve chamber. The pressure chamber (101) includes an end cover chamber (107) between the top wall of the valve body (1) and the vacuum valve disc assembly (3) and an air inlet communication flow channel (108) communicating the storage tank communication port (103) with the end cover chamber (107). The air inlet communication flow channel (108) and the air inlet and outlet flow channel (106) are respectively arranged on two radial sides of the valve chamber.

7. The storage tank for preventing oil and gas condensation according to claim 6, characterized in that, The valve body (1) includes a cylindrical part (112) and an end cover part (111). The intermediate spacer chamber (105), the air inlet and outlet flow channel (106), and the air inlet communication flow channel (108) are all formed inside the cylindrical part (112), and the end cover part (111) covers an axial end of the cylindrical part (112) and forms the end cover chamber (107).

8. The storage tank for preventing oil and gas condensation according to claim 7, characterized in that, The breather valve further includes a heat tracing coil (14) provided on an outer peripheral side of the cylindrical part (112).

9. The storage tank for preventing oil and gas condensation according to claim 7, characterized in that, The breather valve further includes: A connection seat (4) docked with the storage tank communication port (103) and formed with a storage tank connection channel (109) for connecting the storage tank body; Wherein, the pressure chamber (101) further includes an intermediate connection chamber (110) formed between the connection seat (4) and the pressure valve disc assembly (2), and the storage tank connection channel (109), the intermediate connection chamber (110), the air inlet communication flow channel (108), and the end cover chamber (107) are communicated in sequence.

10. The storage tank for preventing oil and gas condensation according to any one of claims 1-9, characterized in that, An oil repellent coating is provided on an inner cavity wall of the vacuum chamber (102).

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