Cold-resistant storage tank breather valve and storage tank

Abstract

The cold-resistant storage tank breather valve comprises a valve body, and a valve cavity in the valve body is divided into a pressure cavity communicating with a tank body of the storage tank and a vacuum cavity provided with an external communicating opening; 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 at intervals; a storage tank connecting channel is formed in the connecting base, and the two ends of the storage tank connecting channel are connected with the pressure cavity and the tank body correspondingly; and the fire retardant disc is arranged in the storage tank connecting channel. The storage tank breather valve and the storage tank have the advantages that smooth breathing can be achieved in the cold environment, the fire retardant disc is prevented from being frozen, and safe operation of the storage tank is guaranteed.

Description

Technical Field

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

[0002] The storage tank breather valve is an essential component in storage tank accessories, which can effectively prevent the overpressure of the storage tank and the negative pressure from sucking the tank flat, and balance the overpressure and vacuum caused by the entry and transfer of the medium in the tank. In winter in northern China, the ambient temperature can reach -20°C, and the night temperature can even reach -40°C. However, in the prior art, most of the flame arresters of the breather valve are arranged at the positions where the air flow inlet and outlet are located. This setting form is likely to cause the flame arrester on the breather valve to freeze in the cold working environment, and then easily lead to poor breathing of the breather valve and inability to ensure the safe operation of the storage tank. Summary of the Utility Model

[0003] The purpose of this application is to provide a cold-resistant storage tank breather valve and a storage tank, which have the advantages of being able to breathe smoothly in a cold environment and ensuring the safe operation of the storage tank.

[0004] To achieve the above purpose, in the first aspect of this application, a cold-resistant storage tank breather valve is provided, which includes:

[0005] A valve body, which is cylindrical and includes a valve cavity with a closed first axial end and an open second axial end. A pressure chamber and a vacuum chamber with an external communication port are separated in the valve cavity, and the external communication port is formed at the second axial end;

[0006] A valve body, in which the valve cavity inside the valve body is separated into a pressure chamber communicating with the tank body of the storage tank and a vacuum chamber provided with an external communication port;

[0007] A valve disc assembly, including a pressure valve disc assembly and a vacuum valve disc assembly that are axially spaced from each other and arranged at the radial middle part of the valve cavity;

[0008] A connection seat, in which a storage tank connection channel is formed inside. The two ends of the storage tank connection channel are respectively connected to the pressure chamber and the tank body;

[0009] A flame arrester, which is arranged in the storage tank connection channel.

[0010] In an embodiment of this application, an annular installation groove is formed on the peripheral wall of the storage tank connection channel, and the flame arrester is installed in the annular installation groove.

[0011] In an embodiment of this application, the flame arrester is provided with mesh holes, and the number range of the mesh holes is 16 mesh - 22 mesh.

[0012] In an embodiment of this application, the thickness range of the flame arrester is 3mm - 7mm.

[0013] In an embodiment of the present application, the opening of the external communication port faces downward. The vacuum chamber includes an intermediate spacer chamber between the pressure valve disc assembly and the vacuum valve disc assembly, and an air inlet / outlet channel connecting the external communication port and the intermediate spacer chamber. The air inlet / outlet channel is vertically distributed and located outside the intermediate spacer chamber.

[0014] In an embodiment of the present application, the external communication port is formed at the bottom end of the valve chamber with its opening facing downward. In the radial direction of the valve body, the air inlet / outlet channel is adjacent to the intermediate spacer chamber.

[0015] In an embodiment of the present application, a storage tank communication port is further formed at the bottom end of the valve chamber. The pressure chamber includes an end cover chamber between the top wall of the valve body and the vacuum valve disc assembly, and an air inlet communication channel connecting the storage tank communication port and the end cover chamber. The air inlet communication channel and the air inlet / outlet channel are respectively arranged on two radial sides of the valve chamber.

[0016] In an embodiment of the present application, the pressure chamber further includes an intermediate connection chamber formed between the connection seat and the pressure valve disc assembly. The valve body includes a cylindrical part and an end cover part. The intermediate spacer chamber, the air inlet / outlet channel, the air inlet communication channel, and the intermediate connection chamber are all formed inside the cylindrical part. The end cover part covers the axial end of the cylindrical part and forms the end cover chamber.

[0017] In an embodiment of the present application, the central axis of the intermediate spacer chamber, the central axis of the intermediate connection chamber, and the central axis of the storage tank connection channel coincide.

[0018] The second aspect of the present application provides a storage tank, which includes the above-mentioned cold-resistant storage tank breather valve.

[0019] It can be seen from the above technical solutions that the storage tank breather valve includes a valve body, a valve disc assembly, a connection seat, and a flame arrester disc. The valve chamber inside the valve body is partitioned into a pressure chamber communicating with the tank body of the storage tank and a vacuum chamber provided with an external communication port; the valve disc assembly includes a pressure valve disc assembly and a vacuum valve disc assembly axially spaced from each other and arranged in the radial middle part of the valve chamber; a storage tank connection channel is formed inside the connection seat, and both ends of the storage tank connection channel are respectively connected to the pressure chamber and the tank body; the flame arrester disc is arranged in the storage tank connection channel, which is convenient for the storage tank breather valve to heat the flame arrester disc with the storage medium in the storage tank, effectively preventing the flame arrester disc from freezing, and further effectively ensuring the breathing smoothness of the storage tank breather valve, which is beneficial to further improving the operation safety of the storage tank breather valve and the storage tank in a cold environment.

[0020] 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

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

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

[0023] Figure 2 is the second sectional view of the storage tank breather valve in the embodiment of the present utility model;

[0024] Figure 3 is Figure 2 the partial enlarged view at position A in;

[0025] Figure 4 is Figure 2 the partial enlarged view at position B in;

[0026] Figure 5 is the overall structure diagram of the storage tank breather valve in the embodiment of the present utility model;

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

[0028] Figure 7 is the second perspective sectional view of the valve body in the embodiment of the present utility model;

[0029] Figure 8 is the third perspective sectional view of the valve body in the embodiment of the present utility model;

[0030] Figure 9 is the fourth perspective sectional view of the valve body in the embodiment of the present utility model;

[0031] Figure 10 is the first perspective structural view of the valve body in the embodiment of the present utility model;

[0032] Figure 11 is the second perspective structural view of the valve body in the embodiment of the present utility model;

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

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

[0035] Explanation of reference numerals

[0036] 1 Valve body 101 Pressure chamber

[0037] 102 Vacuum chamber 103 Storage tank connection port

[0038] 104 External connection port 105 Intermediate spacer chamber

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

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

[0041] 110 Intermediate connection chamber 111 End cap part

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

[0043] 2 Pressure valve disc assembly 201 Valve seat

[0044] 202 Valve disc 203 First guide arc surface

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

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

[0047] 301 Vacuum end valve hole 4 Connection seat

[0048] 5 First partition 6 Second partition

[0049] 7 Third partition 8 First circular arc plate

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

[0051] 901 Second side opening 10 Connection cylinder

[0052] 11 Fourth partition 12 Fins

[0053] 13 Flame arrestor disc 14 Heat insulation pad

[0054] 15 Sealing structure 1501 Annular sealing projection

[0055] 1502 Annular groove 1503 Flexible sealing diaphragm

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

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

[0058] The following provides a detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only for explaining and understanding the present application, and are not used to limit the present application.

[0059] In an embodiment of the present application, a cold-resistant storage tank breather valve is provided. As Figures 1-2 and Figure 5 shown, the storage tank breather valve includes:

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

[0061] A valve disc assembly, including a pressure valve disc assembly 2 and a vacuum valve disc assembly 3 that are axially spaced from each other and arranged at the radial middle part of the valve cavity;

[0062] A connection seat 4, inside which a storage tank connection channel 109 is formed, and both ends of the storage tank connection channel 109 are respectively connected to the pressure cavity 101 and the tank body;

[0063] A flame arrester disc 13, which is arranged in the storage tank connection channel 109.

[0064] Specifically, the upper end of the connection seat 4 is connected to the valve body 1 through a bolt or snap structure. When the storage tank breather valve in this embodiment is in a cold working environment, such as -20°C to -50°C, the first external gas, such as cold air, enters the vacuum cavity 102 through the external communication port 104. If the pressure in the vacuum cavity 102 is greater than the pressure in the pressure cavity 101 (that is, when the internal pressure of the storage tank is lower than the suction pressure), the vacuum valve disc assembly 3 will have a lifting phenomenon. At this time, the first external gas then enters the pressure cavity 101, the storage tank connection channel 109, and the storage tank in sequence from the vacuum cavity 102; when the storage tank breather valve needs to exhale (that is, when the internal pressure of the storage tank exceeds the exhale pressure), the pressure valve disc assembly 2 has a lifting phenomenon, and the gas in the pressure cavity 101 enters the vacuum cavity 102 and then flows to the outside through the external communication port 104;

[0065] Furthermore, the storage medium in the storage tank has a relatively high temperature (such as 10°C to 50°C). The flame arrester disc 13 is arranged in the storage tank connection channel 109, which is convenient for the storage tank breather valve to heat the flame arrester disc 13 by using the storage medium in the storage tank, effectively preventing the flame arrester disc 13 from freezing, and further effectively ensuring the breathing smoothness of the storage tank breather valve, which is beneficial to further improving the operation safety of the storage tank breather valve and the storage tank in a cold environment.

[0066] In an embodiment of the present application, an annular mounting groove is formed on the peripheral wall of the storage tank connection channel 109, and the flame arrestor 13 is installed in the annular mounting groove. Further, the annular mounting groove is formed at one end of the storage tank connection channel 109 close to the pressure chamber 101, and the flame arrestor 13 is embedded in the annular mounting groove. The top wall and the bottom wall of the annular mounting groove both play a role in stopping the flame arrestor 13, preventing the flame arrestor 13 from falling off the annular mounting groove, ensuring the installation stability of the flame arrestor 13, and enabling the flame arrestor 13 to perform the flame arrest performance well.

[0067] In an embodiment of the present application, the flame arrestor 13 is provided with mesh holes, and the number range of the mesh holes is 16 mesh - 22 mesh. Specifically, the radial dimension of the flame arrestor 13 is determined according to the radial dimension of the annular mounting groove (or the radial dimension of the connection seat 4). In this embodiment, the flame arrestor 13 is preferably a metal mesh type flame arrestor, and the mesh holes are arranged on the flame arrest layer of the metal mesh type flame arrestor. Further, the number of the mesh holes is preferably 20 mesh. The above number of mesh holes can ensure that the storage tank breather valve has sufficient ventilation volume.

[0068] In an embodiment of the present application, the thickness range of the flame arrestor 13 is 3 mm - 7 mm. Further, in this embodiment, the thickness of the flame arrestor 13 is preferably 5 mm. The flame arrestor 13 with this thickness value has sufficient strength and can avoid waste of production materials.

[0069] Further, the opening of the external communication port 104 faces downward. The vacuum chamber 102 includes an intermediate spacer chamber 105 between the pressure valve disc assembly 2 and the vacuum valve disc assembly 3 and an air inlet / outlet flow channel 106 connecting the external communication port 104 and the intermediate spacer chamber 105. The air inlet / outlet flow channel 106 is vertically distributed and located outside the intermediate spacer chamber 105.

[0070] Specifically, in this embodiment, the valve body 1 includes a cylindrical portion, a horizontal connection portion, and a vertical connection portion. The horizontal connection portion is disposed on the peripheral wall of the cylindrical portion and is distributed in the horizontal direction. The vertical connection portion is distributed in the vertical direction and its top is connected to the horizontal connection portion. The cavity inside the cylindrical portion, the cavity inside the horizontal connection portion, and the cavity 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 inlet and outlet air flow 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. When the tank breather valve is applied to an environment with strong wind and sand or heavy rain and snow, during the inhalation process of the tank breather valve, the outside first gas enters the inlet and outlet air flow passage 106 through the external communication port 104, then flows through the cavity in the horizontal connection portion of the inlet and outlet air flow passage 106, and then enters the intermediate spacer chamber 105 from the cavity in the horizontal connection portion. If the pressure in the intermediate spacer chamber 105 is greater than the pressure in the pressure chamber 101 (i.e., the internal pressure of the tank body is lower than the inhalation pressure), the vacuum valve disc assembly 3 will have a liftoff phenomenon. At this time, the outside first gas then enters the pressure chamber 101 and the tank body of the storage tank from the intermediate spacer chamber 105. Since the opening of the external communication port 104 in this embodiment faces downward and the inlet and outlet air flow passage 106 is distributed in the vertical direction, the outside first gas (which may contain rain, snow, or sand particles) has to move upward from bottom to top to enter the inlet and outlet air flow passage 106 after passing through the external communication port 104 (during this process, the external force received by the first gas decreases, and some rain, snow, or sand particles may fall under the action of gravity and drop to the outside of the tank breather valve), move upward to the top of the inlet and outlet air flow passage 106, change the flow direction, and then enter the cavity in the horizontal connection portion and the intermediate spacer chamber 105 between the pressure valve disc assembly 2 and the vacuum valve disc assembly 3. Compared with rain, snow, or sand particles directly entering the inside of the tank breather valve from the top or the lateral side of the valve body 1, the tank breather valve in this embodiment increases the difficulty of the first gas containing rain, snow, or sand particles entering the pressure chamber 101 from the outside, and can avoid the occurrence of blockage inside the tank breather valve.

[0071] When the tank breather valve in this embodiment needs to exhale (i.e., the internal pressure of the tank body exceeds the exhalation pressure), the pressure valve disc assembly 2 has a liftoff phenomenon, and the gas in the pressure chamber 101 enters the intermediate spacer chamber 105 and then flows to the outside through the inlet and outlet air flow passage 106.

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

[0073] Specifically, the first gas from the outside (rain, snow or sand particles may be mixed in the first gas) needs to move upward from the outside communication port 104 and enter the inlet and outlet air flow channel 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 storage tank breather valve), move upward to the top of the inlet and outlet air flow channel 106, change the flow direction, and then enter the intermediate 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 body exceeds the exhaling pressure), the pressure valve disc assembly 2 has a jumping phenomenon, the gas in the pressure chamber 101 enters the intermediate cavity 105, and then flows to the outside through the inlet and outlet air flow channel 106. Such a setting can not only avoid blockage inside the storage tank breather valve, but also make the layout inside the valve body 1 more compact, which is beneficial to reducing the overall volume of the storage tank breather valve and realizing the miniaturized design of the storage tank breather valve.

[0074] In an embodiment of the present application, a storage tank connection port 103 is further formed at the bottom end of the valve cavity (the opening of the storage tank connection port 103 faces downward), and the pressure chamber 101 includes an end cover cavity 107 between the top wall of the valve body 1 and the vacuum valve disc assembly 3 and an air inlet connection flow channel 108 connecting the storage tank connection port 103 and the end cover cavity 107. The air inlet connection flow channel 108 and the inlet and outlet air flow channel 106 are respectively arranged on the radial two sides of the valve cavity.

[0075] Specifically, the end of the storage tank connection channel 109 far from the storage tank is communicated with the intermediate connection cavity 110, and the storage tank connection channel 109, the intermediate connection cavity 110, the intermediate cavity 105 and the end cover cavity 107 are sequentially distributed along the axial direction from the first axial end to the second axial end.

[0076] The temperature of the storage medium inside the tank body is 3°C to 5°C higher than its freezing point. When the breather valve of the storage tank 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 of the storage tank is hot air. After the vacuum valve disc assembly 3 jumps up, the first gas from the outside enters the end cover cavity 107 and the intake connection flow channel 108 from the intermediate separation cavity 105, and then enters the tank body from the intake connection flow channel 108 and the storage tank connection port 103. Since the storage tank connection port 103 in this embodiment is formed at the bottom end of the valve cavity, and the end cover cavity 107 is at the top end of the valve cavity, it shows that the first gas entering the pressure cavity 101 has to vertically pass through the entire valve cavity to enter the tank body. And because the air inlet and outlet flow channel 106 and the intake connection flow channel 108 are respectively on the radial two sides of the valve cavity, so when the first gas enters the tank body from the outside, it has to go around from one radial side of the cylindrical part 112 to the other radial side, with a long passing path and needing to change the flow direction multiple times, further increasing the difficulty of the first gas entering the tank body from the outside greatly, which is beneficial to making the first gas entering the tank body more gentle, and then making the pressure valve disc assembly 2 less likely to jump up, so as to reduce the probability of water vapor generated when the first gas and the second gas meet and condensing on the pressure valve disc assembly 2, further improving the working reliability and use safety of the breather valve of the storage tank.

[0077] Further, although multiple chambers that can increase the difficulty of the first gas entering the tank body are provided inside the breather valve of the storage tank in this embodiment, by increasing the flow area of the gas inside the breather valve of the storage tank (such as increasing the radial width of the air inlet and outlet flow channel 106 and the intake connection flow channel 108), the ventilation volume of the breather valve of the storage tank can still meet the API2000 standard (or ISO28300 standard).

[0078] When the breather valve of the storage tank in this embodiment needs to exhale (that is, the internal pressure of the tank body exceeds the exhalation pressure), the pressure valve disc assembly 2 has a jumping-up phenomenon, and the gas in the pressure cavity 101 enters the intermediate separation cavity 105, and then flows to the outside through the air inlet and outlet flow channel 106.

[0079] In one embodiment of the present application, as Figures 1-2 shown, the pressure cavity 101 further includes an intermediate connection cavity 110 formed between the connection seat 4 and the pressure valve disc assembly 2. The valve body 1 includes a hollow cylindrical part 112 and an end cover part 111. The intermediate separation cavity 105, the air inlet and outlet flow channel 106, the intake connection flow channel 108, and the intermediate connection cavity 110 are all formed inside the cylindrical part 112, and the end cover part 111 covers the axial end of the cylindrical part 112 and forms an end cover cavity 107.

[0080] Specifically, the end - cover cavity 107 is formed by recessing upward from the bottom surface of the end - cover part 111. The top of the end - cover part 111 and the top of the cylinder part 112 are cooperated through a bolt or a snap - fit structure. Preferably, the end - cover part 111 is fixed on the cylinder part 112 through a snap - fit structure so that the two form a stable and good cooperation. Further, the corner connection between the top wall of the end - cover cavity 107 and the peripheral wall of the end - cover cavity 107 is formed as a smooth arc transition, and the radius 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 kind of setting can not only improve the stress concentration situation of the end - cover part 111 and the storage - tank breather valve, but also optimize the fluidity of the gas in the end - cover cavity 107.

[0081] In an embodiment of the present application, as Figures 6-11 shown, the storage - tank breather valve further includes:

[0082] A partition assembly for separating and forming each chamber in the valve cavity. In this embodiment, each chamber includes an intermediate interval cavity 105, an intermediate connection cavity 110, an air inlet and outlet flow channel 106, and an air - inlet communication flow channel 108.

[0083] Specifically, the partition assembly includes:

[0084] A first arc - shaped 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 separate and form an intermediate interval cavity 105 in the valve cavity;

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

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

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

[0088] A second partition 6, arranged on the first - end side of the first partition 5;

[0089] 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 partition and form an air inlet and outlet flow channel 106 in the valve cavity.

[0090] 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 body part 112. It is used to act together with the second partition plate 6, the third partition plate 7 and the first arc plate 8 to partition and form an air inlet connecting flow channel 108 in the valve cavity.

[0091] In this embodiment, both the first partition plate 5 and the fourth partition plate 11 are arranged horizontally and are arc-shaped. The first partition plate 5 and the fourth partition plate 11 are respectively on the two radial 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 vertically. The two vertical 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 two vertical 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 for connecting the air inlet and outlet flow channel 106 and the intermediate interval cavity 105 is formed between the two circumferential ends of the first arc plate 8. A second side opening 901 for connecting the air inlet connecting flow channel 108 and the intermediate connection cavity 110 is formed between the two circumferential ends of the second arc plate 9. The above settings further extend the flow path of the first gas in the storage tank breather valve, increase the number of turns required for the first gas to flow in the storage tank breather valve, further improve the smoothness of the first gas flow, further reduce the disturbance of the gas in the tank body, and thus make the breathing of the storage tank breather valve more stable, which is beneficial to further ensure the use reliability of the storage tank breather valve.

[0092] 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 coincide with the central axis of the storage tank connection channel 109.

[0093] Specifically, the bottom of the connection seat 4 forms an interface flange part for connecting the tank body. The interface flange part is provided with a storage tank connection port 103 for allowing air flow to enter the interior of the storage tank breather valve. The selection of the storage tank breather valve model is related to the volume of the tank body and the breathing gas volume per unit time. In this embodiment, the diameter of the interface flange part is the model size of the storage tank breather valve. The above settings can make the flow field inside the valve body 1 more evenly distributed, which is beneficial to reducing the tremor situation of the storage tank breather valve.

[0094] In an embodiment of the present application, the storage tank breather valve further includes fins 12 arranged in the air inlet and outlet flow channel 106 and distributed obliquely downward.

[0095] Specifically, the downward inclination arrangement of the fins 12 can block the upward flowing first gas, increasing the difficulty for the first gas to enter the pressure chamber 101 and the tank body. That is, it can block the rain, snow or sand and dust mixed in the first gas during the inhalation process of the storage tank breather valve, which is beneficial to reducing the amount of rain, snow or sand and dust entering the interior of the storage tank breather valve, and further can alleviate or avoid the situation of rain, snow, sand and dust blocking the interior of the storage tank breather valve; it can also guide the gas when it flows out of the storage tank breather valve, enabling the second gas exhaled from the storage tank breather valve to flow out quickly (that is, the setting of such fins 12 can make the resistance when the second gas in the tank body is discharged much smaller than the resistance when the first gas is inhaled, so as to meet the optimal flow channel design); in addition, when the storage tank breather valve exhales, the first gas in the intermediate cavity 105 meets the exhaled second gas and generates condensed water, and the setting of the fins 12 can quickly lead the above-mentioned condensed water flowing out to the air inlet and outlet channel 106 to the outside of the storage tank breather valve.

[0096] In an embodiment of the present application, the cross-section of the fin 12 is linear or arc-shaped. The fins 12 with the above two cross-sectional shapes can not only block the entry of the external first gas into the interior of the storage tank breather valve and quickly lead out the second gas or condensed water exhaled from the storage tank breather valve, but also have the advantages of simple structure, convenient production and manufacturing, and can reduce the production difficulty and cost of the breather valve.

[0097] Further, in this embodiment, the number of fins 12 can be multiple (such as 2). The multiple fins 12 are sequentially arranged on the inner peripheral wall of the cylindrical body 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 spacing between two vertically adjacent fins 12 meets the ventilation requirements of the storage tank breather valve. In addition, the multiple fins 12 are arranged at intervals in the vertically distributed air inlet and outlet channels 106, which reduces the upward movement power of rain, snow or sand (compared with the outside, less first gas enters the air inlet and outlet channels 106, so the upward power of rain, snow or sand mixed in the first gas is reduced). Since the gravity of the above-mentioned rain, snow or sand remains unchanged, the difficulty of upward movement of rain, snow or sand mixed in the first gas increases. In addition, the probability of rain, snow or sand colliding with the fins 12 and falling after entering the air inlet and outlet channels 106 and separating from the first gas is increased, further enhancing the difficulty of rain, snow or sand mixed in the first gas moving to the middle interval cavity 105. Further, an arc transition is adopted between the inner peripheral wall of the cylindrical body 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 between the inner peripheral wall of the cylindrical body 112, the outer side wall of the second arc plate 9, the outer side wall of the connecting cylinder 10 and the fins 12 ranges from 40° to 50°. Preferably, the above included angle is 45°, so as to change 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 ability to drain condensate water.

[0098] In an embodiment of the present application, a hydrophobic coating is provided on the inner cavity wall of the vacuum cavity 102.

[0099] Specifically, the inner cavity wall of the vacuum cavity 102 includes the bottom wall of the first partition 5, the inner side wall of the cylindrical body 112, the inner side wall of the first arc plate 8, the outer side wall of the second arc plate 9, and the outer peripheral wall of the connecting cylinder 10. The hydrophobic coating in this embodiment can be selected as a methyl silicone coating (or other super-hydrophobic material coatings). Since methyl silicone has high weather resistance, waterproof, moisture-proof and chemical-resistant stability, and the coating is transparent, hard, wear-resistant, heat-resistant and has excellent water repellency.

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

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

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

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

[0104] An annular groove 1502 formed on the valve disc and vertically opposite to the annular sealing projection 1501;

[0105] A flexible sealing diaphragm 1503 provided on the valve disc and covering the annular groove 1502. In the state where the valve seat 201 and the valve disc are in a fitting and sealing state, the annular sealing projection 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 projection 1501 elastically extends towards the inside of the annular groove 1502.

[0106] Specifically, the opening of the annular groove 1502 faces downward, a fitting and sealing surface is formed on the valve disc 202, the flexible sealing diaphragm 1503 is provided on the bottom wall of the valve disc 202 and simultaneously covers the opening of the annular groove 1502. When the valve disc 202 approaches the valve seat 201 downward, the annular sealing projection 1501 on the valve seat 201 can at least partially extend upward into the annular groove 1502. At this time, the annular sealing projection 1501 and the flexible sealing diaphragm 1503 form 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 tank breather during the inhalation process of the tank breather, and no condensate 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 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 tank breather, the second gas exhaled from the tank body and the first gas from the outside are likely to meet and generate condensate (the condensate is likely to freeze after the temperature drops). If multiple sets of sealing structures 15 are provided on the pressure valve disc assembly 2, it is easier for the pressure valve disc assembly 2 to accumulate water and cause icing. Therefore, only one set of sealing structure 15 can be provided on the pressure valve disc assembly 2.

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

[0108] 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.

[0109] The height range of the annular sealing protrusion 1501 of the sealing structure 15 is 3 mm to 3.4 mm. For example, the height of the annular sealing protrusion 1501 of the sealing structure 15 is 3 mm, 3.1 mm, 3.2 mm or 3.4 mm; the inner angle of the annular sealing 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 3.2 mm, and the inner angle of the annular sealing protrusion 1501 of the sealing structure 15 is 60°.

[0110] The flexible sealing diaphragm 1503 is a fabricated part made of fluorinated ethylene propylene copolymer, that is, the flexible sealing diaphragm 1503 in the sealing structure 15 is made of fluorinated ethylene 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 to make the flexible sealing diaphragm 1503 have a certain hardness.

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

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

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

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

[0115] Further, in the vacuum valve disc assembly 3, the height range of the valve seat 201 is 25 mm to 35 mm. For example, the height of the valve seat 201 is 25 mm, 27 mm, 30 mm, 32 mm or 35 mm. Preferably, the height of the valve seat 201 is 30 mm to ensure that the valve seat 201 of the vacuum valve disc assembly 3 has sufficient strength; the height range of the annular sealing projection 1501 is 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.

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

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

[0118] Further, in the vacuum valve disc assembly 3, the 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.

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

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

[0121]

[0122] Wherein, D1 is the inner diameter of the cylinder part 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 tank body, and the units are all mm.

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

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

[0125] 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 to which the valve disc 202 of the vacuum valve disc assembly 3 rises is called the maximum lifting height of the valve disc 202 of the vacuum valve disc assembly 3. The maximum lifting height of the valve disc 202 of the vacuum valve disc assembly 3 should meet the ventilation volume requirements of the storage tank breather valve and should be greater than 0.5D.

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

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

[0128] In another embodiment, the one - character positioning plate 19 in the storage tank breather valve is replaced with a cross - shaped 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 - shaped positioning plate and a bolt assembly. Among them, the width range of the cross - shaped positioning plate is 5 mm to 15 mm. Preferably, the width of the cross - shaped positioning plate is 10 mm, and the cross - shaped positioning plate and the pressure valve guide rod sleeve 17 are integrally formed.

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

[0130] In an embodiment of the present application, a first 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 on the radially inner side and the radially outer side of the annular sealing projection 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 out the condensed water that accumulates on the radially two sides of the annular sealing projection 1501 in the sealing structure 15, and avoid the condensed water from freezing at the position of the sealing structure 15 and freezing the valve seat 201 and the valve disc of the pressure valve disc assembly 2 together.

[0131] In an embodiment of the present application, a 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.

[0132] 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 out the condensed water flowing onto the flow guiding inclined surface 205 from the valve seat 201 of the pressure valve disc assembly 2, and avoid the condensed water from accumulating on the valve seat 201 of the pressure valve disc assembly 2 and freezing.

[0133] In an embodiment of the present application, a 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 condensed water at the position where the flow guiding groove is located, but also facilitates the guiding of the condensed water to the outside of the valve disc, further reducing the possibility of the valve disc 202 and the valve seat 201 of the pressure valve disc assembly 2 freezing together. Further, the 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.

[0134] 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 storage tank breather valve from freezing at -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%, 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 also include polyethylene (POE) or ethylene propylene diene monomer (EPDM) with a content of not less than 3% to 15 wt%, increasing the toughness and low-temperature resistance of the valve disc 202 of the pressure valve disc assembly 2.

[0135] In an embodiment of the present application, the 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.

[0136] In another embodiment of the present application, a storage tank is provided, which includes a tank body and the above-mentioned cold-resistant storage tank breather valve.

[0137] The following examples are used to further illustrate the cold-resistant storage tank breather valve and storage tank of the present application. The examples 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 examples.

[0138] Example 1

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

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

[0141] When the gas in the crude oil tank is under negative pressure and lower than the negative pressure setting pressure of -300 Pa, the valve disc 202 of the vacuum valve disc assembly 3 rises upward, the air inlet and outlet flow channel 106 and the air inlet connecting flow channel 108 are connected, the pressure in the crude oil tank is lower than -324 Pa, and the valve disc 202 of the vacuum valve disc assembly 3 fully lifts off. The outside inhales into the tank through the air inlet and outlet flow channel 106 via the air inlet connecting flow channel 108 to supplement the pressure in the tank. When the gas pressure in the tank is higher than the reseating pressure of -270 Pa of the valve disc 202 of the vacuum valve disc assembly 3, the valve disc 202 of the vacuum valve disc assembly 3 quickly reseats. 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. This leakage rate meets the API2000 standard and belongs to a low leakage rate.

[0142] Example 2

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

[0144] The gas in the diesel oil storage tank is set to negative pressure and lower than the negative pressure setting pressure of -300 Pa for testing. The test results show that the leakage rate of the storage tank 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 a low leakage rate. The other settings of the storage tank breather valve in Example 2 are the same as those in Example 1 and will not be elaborated here.

[0145] Example 3

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

[0147] The gas in the gasoline tank is set to negative pressure and lower than the negative pressure setting pressure of -300 Pa for testing. The test results show that the leakage rate of the storage tank 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 storage tank breather valve in Example 3 are the same as those in Example 1, which will not be elaborated here.

[0148] Example 4

[0149] Taking the storage tank breather valve A4 applied to a 1000-cubic lubricating oil tank as an example, the diameter of the interface flange part at the bottom of the connecting seat 4 of this storage tank breather valve is DN50. The gas pressure in the lubricating oil storage tank is set to positive pressure and exceeds the exhalation set pressure of the storage tank breather valve by 800 Pa for the test. The test results show that the leakage rate of the storage tank breather valve in the above situation is not higher than 0.0015 m 3 / h. This leakage rate meets the API2000 standard and belongs to low leakage;

[0150] The gas in the lubricating oil storage tank is set to negative pressure and is lower than the negative pressure set pressure of -300 Pa for the test. The test results show that the leakage rate of the storage tank breather valve in the above situation is not higher than 0.0015 m 3 / h. This leakage rate meets the API2000 standard and belongs to low leakage. The other settings of the storage tank breather valve in Example 4 are the same as those in Example 1, which will not be elaborated here.

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

[0152] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or communication with each other; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal connection 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 this application can be understood according to specific circumstances.

[0153] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", 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 the present 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 may 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.

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

Claims

1. Cold-resistant storage tank breather valve, characterized in that, The storage tank breather valve includes: A valve body (1), in which a valve cavity inside the valve body (1) is partitioned into a pressure cavity (101) communicating with the tank body of the storage tank and a vacuum cavity (102) provided with an external communication port (104); A valve disc assembly, including a pressure valve disc assembly (2) and a vacuum valve disc assembly (3) that are axially spaced from each other and arranged at the radial middle part of the valve cavity; A connection seat (4), inside which a storage tank connection channel (109) is formed, and both ends of the storage tank connection channel (109) are respectively connected to the pressure cavity (101) and the tank body; A flame arrester disc (13), which is arranged in the storage tank connection channel (109).

2. The cold-resistant storage tank breather valve according to claim 1, characterized in that, An annular installation groove is formed on the peripheral wall of the storage tank connection channel (109), and the flame arrester disc (13) is installed in the annular installation groove.

3. The cold-resistant storage tank breather valve 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 cold-resistant storage tank breather valve according to claim 1, characterized in that, The thickness range of the flame arrester disc (13) is 3 mm - 7 mm.

5. The cold-resistant storage tank breather valve according to any one of claims 1-4, characterized in that, The opening of the external communication port (104) faces downward. The vacuum cavity (102) includes an intermediate spacer cavity (105) between the pressure valve disc assembly (2) and the vacuum valve disc assembly (3), and an air inlet and outlet flow channel (106) connecting the external communication port (104) and the intermediate spacer cavity (105). The air inlet and outlet flow channel (106) is vertically distributed and located outside the intermediate spacer cavity (105).

6. The cold-resistant storage tank breather valve according to claim 5, characterized in that, The external communication port (104) is formed at the bottom end of the valve cavity with the opening facing downward. In the radial direction of the valve body (1), the air inlet and outlet flow channel (106) is adjacent to the intermediate spacer cavity (105).

7. The cold-resistant storage tank breather valve according to claim 5, characterized in that, A storage tank communication port (103) 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 air inlet communication flow channel (108) connecting the storage tank communication port (103) and the end cover cavity (107). The air inlet communication flow channel (108) and the air inlet and outlet flow channel (106) are respectively arranged on the radial two sides of the valve cavity.

8. The cold-resistant storage tank breather valve according to claim 7, characterized in that, The pressure cavity (101) further includes an intermediate connection cavity (110) formed between the connection seat (4) and the pressure valve disc assembly (2). The valve body (1) includes a cylindrical part (112) and an end cover part (111). The intermediate spacer cavity (105), the air inlet and outlet flow channel (106), the air inlet communication flow channel (108), and the intermediate connection cavity (110) are all formed inside the cylindrical part (112). The end cover part (111) covers the axial end of the cylindrical part (112) and forms the end cover cavity (107).

9. The cold-resistant storage tank breather valve according to claim 8, characterized in that, The central axis of the intermediate spacer cavity (105), the central axis of the intermediate connection cavity (110), and the central axis of the storage tank connection channel (109) coincide.

10. Storage tank, characterized in that, The storage tank includes a tank body and a cold-resistant storage tank breather valve according to any one of claims 1 - 9.

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