Breather valve for atmospheric storage tank

Abstract

The application discloses a breather valve for normal-pressure storage tanks, which comprises an outer bin, a sealing tank and a ventilation pipeline. The outer bin is provided with an air inlet and an air outlet. The ventilation pipeline is arranged at the bottom of the outer bin and is communicated with the air inlet. The air outlet is higher than the sealing tank. The sealing tank is inverted and buckled at the ventilation pipeline. There is a space between the side wall of the sealing tank and the inner wall of the outer bin and the side wall of the ventilation pipeline. A sealing liquid is arranged between the sealing tank and the inner wall of the outer bin and the side wall of the ventilation pipeline. The top of the sealing tank is provided with a ventilation opening. The edge of the ventilation opening is provided with an annular protrusion extending towards the air inlet. A sealing disc is arranged in the ventilation pipeline and is arranged opposite to the annular protrusion. The outer bin is provided with an elastic lifting structure. The elastic lifting structure is connected with the sealing disc and is used for driving the sealing disc to be tightly attached to the annular protrusion. The problem that when the temperature difference of the outside changes little, nitrogen or other inert gases still need to be filled and discharged to the normal-pressure storage tank, thereby causing a large amount of resource waste is solved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of storage tanks, and in particular to a breathing valve for a normal pressure storage tank. Background Art

[0002] At present, atmospheric pressure storage tanks used to store oil are placed in an environment exposed to air and are stored in a nitrogen-sealed manner. In this way, when the outside temperature drops, nitrogen needs to be filled into the tank due to cold contraction. When the outside temperature rises, nitrogen needs to be released from the tank due to thermal expansion.

[0003] However, since weather changes are uncontrollable factors, when the external temperature difference changes slightly, nitrogen or other inert gases need to be filled and discharged into the atmospheric pressure storage tank, resulting in a large waste of resources. In addition, filling and deflating the atmospheric pressure storage tank in a short period of time will cause the equipment to operate frequently, causing damage to the equipment life. Summary of the Invention

[0004] The purpose of the present disclosure is to provide a breathing valve for a normal pressure storage tank, which solves the existing problem that when the external temperature difference changes slightly, nitrogen or other inert gases need to be charged and discharged into the normal pressure storage tank, resulting in a large amount of resource waste.

[0005] To achieve the above-mentioned object, the first aspect of the present disclosure provides a breathing valve for a normal pressure storage tank, comprising an outer chamber, a sealing tank and a ventilation pipe;

[0006] The outer bin is provided with an air inlet and an air outlet, the ventilation pipe is provided at the bottom of the outer bin and is connected to the air inlet, and the air outlet is higher than the sealed tank;

[0007] The sealing tank is inverted onto the ventilation duct, a gap is formed between the side wall of the sealing tank and the inner wall of the outer bin and the side wall of the ventilation duct, and a sealing liquid is provided between the sealing tank and the inner wall of the outer bin and the side wall of the ventilation duct;

[0008] The top of the sealed tank is provided with a vent, the edge of the vent is provided with an annular protrusion extending toward the air inlet, and a sealing disk is provided in the ventilation pipe, and the sealing disk is arranged opposite to the annular protrusion;

[0009] An elastic lifting structure is provided on the outer bin, and the elastic lifting structure is connected to the sealing disk to drive the sealing disk to be tightly attached to the annular protrusion.

[0010] In some embodiments, a plurality of annular sleeves are sequentially sleeved on the outside of the sealed can, each annular sleeve has the same height, and there is a gap between each annular sleeve;

[0011] Along the direction from the sealing can to the annular sleeve, the distance between the bottom of each annular sleeve and the bottom of the sealing can increases in sequence;

[0012] The sealing liquid is sealed and filled between each of the annular sleeves. In some embodiments, a plurality of partitions are provided between the inner wall of the annular sleeve away from the sealing tank and the outer wall of the sealing tank;

[0013] The partition includes a first plate portion, a second plate portion fixedly arranged between two adjacent annular sleeves, and a connecting plate portion. The first plate portion is fixedly arranged between the outer wall of the sealed tank and the inner annular sleeve, and the connecting plate portion is connected between the tops of the first and second plate portions.

[0014] In some embodiments, the elastic lifting structure includes a lifting sleeve and a lifting shaft, the lifting sleeve passes through the outer compartment, a connecting structure is provided between the lifting shaft and the lifting sleeve, and the upper end of the lifting shaft is fixed to the lifting sleeve through the connecting structure;

[0015] The sealing disk is connected to the lower end of the lifting shaft. A first annular fixing plate is provided on the outer side wall of the lifting sleeve. A first elastic member is provided on the side of the first annular fixing plate facing the outer bin. The first elastic member is fixedly connected to the outer bin.

[0016] In some embodiments, the connecting structure includes a second sleeve, the second sleeve is sleeved to the lower end of the lifting sleeve, and the lower end of the second sleeve is provided with a clamping portion extending toward the axis direction of the lifting sleeve;

[0017] A second annular fixing plate is provided on the upper end of the lifting shaft, a second elastic member is provided on the side of the clamping portion facing the second annular fixing plate, and the second elastic member abuts against the second annular fixing plate.

[0018] In some embodiments, the outer chamber is provided with a first sleeve, and the lifting sleeve passes through the first sleeve.

[0019] In some embodiments, a first limiting tube is provided at the center of the vent, a first fixed shaft is provided on the side wall of the first limiting tube, the other end of the first fixed shaft is connected to the annular protrusion, and the lifting shaft passes through the first limiting tube.

[0020] In some embodiments, a second limiting tube is provided at the center position of the ventilation duct, a second fixed shaft is provided on the side wall of the second limiting tube, the other end of the second fixed shaft is connected to the inner wall of the ventilation duct, and the lifting shaft can extend into the second limiting tube.

[0021] In some embodiments, the sealing disk can be sleeved onto the annular protrusion, and the inner side wall of the sealing disk fits with the annular protrusion.

[0022] In some embodiments, a sealing gasket is provided on the outer side wall of the annular protrusion, and after the sealing disk is sleeved onto the annular protrusion, the sealing gasket is attached to the inner side wall of the sealing disk.

[0023] By adopting the above technical solution and the above structural setting, the air inlet of the breathing valve for the atmospheric pressure storage tank is connected to the upper end opening of the atmospheric pressure storage tank, the above annular protrusion fits tightly with the sealing disk, and the sealing liquid heights on both sides are at the same horizontal line. When the external environment and temperature rise, the petroleum in the atmospheric pressure storage tank is gasified, converted into light hydrocarbon gas and rises into the ventilation pipe, so that the light hydrocarbon gas can be temporarily stored in the ventilation pipe. When the light hydrocarbon gas in the ventilation pipe exceeds the capacity of the ventilation pipe, the light hydrocarbon gas will push the sealing disk to move upward, thereby pushing the annular protrusion and the sealing tank to move upward, thereby increasing the space so that more light hydrocarbon gas can be accommodated. The sealing liquid between the sealing tank and the inner wall of the outer warehouse and the ventilation pipe forms a liquid level difference due to the maintenance of constant pressure and sealing effect. However, when excessive light hydrocarbon gas enters the ventilation pipe and the sealing tank, the light hydrocarbon gas will push the sealing tank to the highest point, so that the sealing tank is separated from the sealing liquid, and the light hydrocarbon gas is released from the air outlet.

[0024] When the outside temperature drops, the light hydrocarbon gas used in the atmospheric pressure storage tank is liquefied, and the pressure in the sealed tank decreases, resulting in different pressures on both sides of the sealing disk, causing the sealing disk to move downward, thereby causing the elastic pulling structure to move downward, and the sealing disk to separate from the annular protrusion, allowing the outside gas to enter the atmospheric pressure storage tank through the ventilation pipe. At the same time, the sealing liquid between the sealing tank and the inner wall of the outer warehouse and the ventilation pipe can keep the pressure in the sealed tank unchanged.

[0025] The effects that can be achieved through the above settings are:

[0026] 1. By setting up an elastic lifting structure, the sealing disc can be driven to move up and down, thereby achieving close contact and separation with the annular protrusion, and ultimately achieving connection and blocking of external gas;

[0027] 2. By setting up a vent, the normal pressure storage tank can be connected to the outside atmosphere, so that the gas can circulate between them when necessary;

[0028] 3. By setting a sealing liquid between the sealed tank and the inner wall of the outer chamber and the side wall of the ventilation pipe, the pressure in the sealed tank can be kept constant at all times, further stabilizing the state of the oil in the atmospheric pressure storage tank.

[0029] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings are used to provide further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure, but do not constitute a limitation of the present disclosure.

[0031] In the attached figure:

[0032] Figure 1 This is a schematic diagram of the overall structure of the breathing valve for atmospheric pressure storage tanks of the present invention;

[0033] Figure 2 yes Figure 1 A magnified view of the structure at point A above;

[0034] Figure 3 It is a partial structural diagram of the sealing tank, annular sleeve and partition of the present invention;

[0035] Figure 4 It is a partial structural diagram of the sealing tank and the annular sleeve of the present invention;

[0036] Figure 5 It is a partial structural schematic diagram of the sealing tank and the annular sleeve of the present invention.

[0037] Description of reference numerals:

[0038] 1. Outer compartment; 2. Elastic lifting structure; 21. Lifting sleeve; 3. Sealing tank; 31. Vent; 32. Annular protrusion; 4. Vent duct; 41. Second position limiting tube; 42. Second fixed shaft; 11. Air inlet; 12. Air outlet; 5. Sealing disk; 6. Lifting shaft; 61. Second annular fixing plate; 62. Second elastic member; 7. Connecting structure; 8. First annular fixing plate; 9. First elastic member; 71. Second shaft sleeve; 72. Clamping portion; 10. First shaft sleeve; 13. First position limiting tube; 14. First fixed shaft; 16. Sealing liquid; 17. Annular sleeve; 19. Partition; 191. First plate portion; 192. Second plate portion; 193. Connecting plate portion. DETAILED DESCRIPTION

[0039] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0040] The present disclosure provides a breathing valve for a normal pressure storage tank, such as Figure 1 and Figure 2As shown, it includes an outer warehouse 1, a sealing tank 3 and a ventilation duct 4; an air inlet 11 and an air outlet 12 are provided on the outer warehouse 1, the ventilation duct 4 is arranged at the bottom of the outer warehouse 1 and is connected with the air inlet 11, and the air outlet 12 is higher than the sealing tank 3; the sealing tank 3 is turned upside down to the ventilation duct 4, and there is a gap between the side wall of the sealing tank 3 and the inner wall of the outer warehouse 1 and the side wall of the ventilation duct 4, and a sealing liquid 16 is provided between the sealing tank 3 and the inner wall of the outer warehouse 1 and the side wall of the ventilation duct 4; an air vent 31 is provided on the top of the sealing tank 3, and an annular protrusion 32 extending toward the air inlet 11 is provided on the edge of the air vent 31, and a sealing disk 5 is provided in the ventilation duct 4, and the sealing disk 5 is arranged opposite to the annular protrusion 32; an elastic pulling structure 2 is provided on the outer warehouse 1, and the elastic pulling structure 2 is connected to the sealing disk 5 to drive the sealing disk 5 to fit tightly onto the annular protrusion 32.

[0041] Through the above-mentioned structural arrangement, the air inlet 11 of the breathing valve for the atmospheric pressure storage tank is connected to the upper end opening of the atmospheric pressure storage tank, the above-mentioned annular protrusion 32 is tightly fitted with the sealing disk 5, and the heights of the sealing liquid 16 on both sides are at the same horizontal line. When the outside world and the temperature rise, the petroleum in the atmospheric pressure storage tank is gasified, converted into light hydrocarbon gas and rises into the ventilation pipe 4. In this way, the light hydrocarbon gas can be temporarily stored in the ventilation pipe 4. When the light hydrocarbon gas in the ventilation pipe 4 exceeds the capacity of the ventilation pipe 4, the light hydrocarbon gas will push the sealing disk 5 to The elastic lifting structure 2 moves upward, and then pushes the annular protrusion 32 and the sealing tank 3 to move upward, thereby increasing the space to accommodate more light hydrocarbon gas. The sealing liquid 16 between the sealing tank 3 and the inner wall of the outer chamber 1 and the ventilation pipe 4 forms a liquid level difference due to maintaining constant pressure and sealing effect. However, when excessive light hydrocarbon gas enters the ventilation pipe 4 and the sealing tank 3, the light hydrocarbon gas will push the sealing tank 3 to the highest point, so that the sealing tank 3 is separated from the sealing liquid 16, and the light hydrocarbon gas is released from the outlet 12.

[0042] When the outside temperature drops, the light hydrocarbon gas used in the atmospheric pressure storage tank is liquefied, and the pressure in the sealing tank 3 decreases, resulting in different pressures on both sides of the sealing disk 5, causing the sealing disk 5 to move downward, thereby causing the elastic pulling structure 2 to move downward, and the sealing disk 5 to separate from the annular protrusion 32, allowing the outside gas to enter the atmospheric pressure storage tank through the ventilation pipe 4. At the same time, the sealing liquid 16 between the sealing tank 3 and the inner wall of the outer warehouse 1 and the ventilation pipe 4 can keep the pressure in the sealing tank 3 unchanged.

[0043] In this way, when the sealing disk 5 is sealed, the exhaust action is completed, and when the sealing disk 5 is opened, the air intake action is completed. When the external temperature rises by a small margin, the light hydrocarbon gas can be temporarily stored in the ventilation pipe 4. When the external temperature drops, the light hydrocarbon gas is liquefied and refluxed, thereby reducing the input of inert gases such as nitrogen, saving resources and protecting the service life of the equipment.

[0044] In some embodiments, as Figure 3、 Figure 4 and Figure 5 As shown, multiple annular sleeves 17 are sequentially sleeved on the outside of the sealing tank 3, each annular sleeve 17 has the same height, and there is a gap between each annular sleeve 17; along the direction of the sealing tank 3 toward the annular sleeve 17, the distance between the bottom of each annular sleeve 17 and the bottom of the sealing tank 3 increases successively; the sealing liquid 16 is sealed and filled between each annular sleeve 17. Through the above-mentioned structural arrangement, when the light hydrocarbon gas in the ventilation pipe 4 increases, the sealing disk 5 is subjected to upward pressure. When the sealing disk 5 is in close contact with the annular protrusion 32 to form a seal, the exhaust action is completed. However, as the external temperature continues to rise, the light hydrocarbon gas in the sealing tank 3 continues to increase until it exceeds the capacity of the sealing tank 3, and then the elastic pulling structure 2 drives the sealing tank 3 to move upward, and the multiple annular sleeves 17 connected to the sealing tank 3 also move upward. When the light hydrocarbon gas is excessive, the bottom of the sealing tank 3 is first separated from the sealing liquid, and the excess light hydrocarbon gas is output from the lower end of the sealing tank 3 to the air outlet 12 for release. If the light hydrocarbon gas continues to increase sharply, the bottom of the annular sleeve 17 is separated from the sealing liquid 16 in sequence from high to low, so that the light hydrocarbon gas can be output not only from the bottom of the sealing tank 3, but also from the bottom of the annular sleeve 17 that is separated from the sealing liquid, thereby increasing the emission of light hydrocarbon gas. At the same time, when a large amount of gas is generated in the atmospheric pressure storage tank and needs to be discharged, the gas can be continuously discharged from the channel between the sealed tank 3 and the innermost annular sleeve 17. If the exhaust volume in the atmospheric pressure storage tank is further increased, the gas can be output from the channel between the two adjacent annular sleeves 17 to avoid the sudden rise and fall of the sealed tank 3, ensure the stability of the sealed tank 3, and avoid the sealing liquid from being splashed randomly due to the sudden rise and fall of the sealed tank 3.

[0045] When too much light hydrocarbon gas enters the ventilation pipe 4 in a short period of time, the sealing tank 3 is subjected to uneven force. When it tilts to one side, one side of the annular sleeve 17 is separated from the sealing liquid 16, so that the excess light hydrocarbon gas can be discharged from the gap between the annular sleeves 17, thereby achieving the purpose of maintaining the stability of the breathing valve.

[0046] In some embodiments, as Figure 3 、 Figure 4 and Figure 5 As shown, a plurality of partitions 19 are provided between the inner wall of the annular sleeve 17 away from the sealed tank 3 and the outer wall of the sealed tank 3; the partition 19 includes a first plate portion 191, a second plate portion 192 fixedly provided between two adjacent annular sleeves 17, and a connecting plate portion 193. The first plate portion 191 is fixedly provided between the outer wall of the sealed tank 3 and the inner annular sleeve 17, and the connecting plate portion 193 is connected between the top of the first plate portion 191 and the second plate portion 192.

[0047] Through the above arrangement, multiple annular sleeves 17 can be simultaneously raised along with the sealed tank 3, thereby achieving the sequential separation of the bottoms of multiple annular sleeves 17 from the sealing liquid 16, thereby increasing the amount of light hydrocarbon gas, and correspondingly increasing the number of annular sleeves 17 separated from the sealing liquid 16, thereby increasing the number of channels for releasing light hydrocarbon gas. In addition, multiple exhaust channels are formed between the sealed tank 3 and the annular sleeve 17 by the partition 19. In this way, when the gas in the atmospheric storage tank is discharged and the sealed tank 3 is tilted to a certain extent, the gas to be discharged can be discharged from the exhaust channel between the tilted end of the sealed tank 3 and the annular sleeve 17, thereby facilitating the discharge of gas and facilitating the return of the sealed tank 3 to its original position.

[0048] In some embodiments, as Figure 1 and Figure 2 As shown, the elastic lifting structure 2 includes a lifting sleeve 21 and a lifting shaft 6. The lifting sleeve 21 passes through the outer warehouse 1. A connecting structure 7 is provided between the lifting shaft 6 and the lifting sleeve 21. The upper end of the lifting shaft 6 is fixed to the lifting sleeve 21 through the connecting structure 7; the sealing disk 5 is connected to the lower end of the lifting shaft 6, and a first annular fixing plate 8 is provided on the outer wall of the lifting sleeve 21. A first elastic member 9 is provided on the side of the first annular fixing plate 8 facing the outer warehouse 1, and the first elastic member 9 is fixedly connected to the outer warehouse 1.

[0049] Through the above-mentioned structural setting, when the light hydrocarbon gas in the ventilation pipe 4 increases, the sealing disk 5 is subjected to upward pressure, and the lifting shaft 6 drives the sealing disk 5 to rise. When the light hydrocarbon gas exceeds the capacity of the ventilation pipe 4, the sealing disk 5 is in close contact with the above-mentioned annular protrusion 32, thereby driving the sealing tank 3 to move upward together. When the light hydrocarbon gas is excessive, the sealing tank 3 will be separated from the sealing liquid 16, and the light hydrocarbon gas will move from the lower end of the sealing tank 3 to the air outlet 12 and be released from the air outlet 12.

[0050] When the light hydrocarbon gas in the ventilation pipe 4 decreases, the sealing disk 5 is subjected to downward pressure, and the lifting shaft 6 drives the sealing disk 5 to descend. As the light hydrocarbon gas decreases, the sealing disk 5 separates from the annular protrusion 32, allowing the external gas to enter the breathing valve for the atmospheric pressure storage tank from the air outlet 12, and then enter the ventilation pipe 4 from the air vent 31, and finally enter the atmospheric pressure storage tank from the air inlet 11 to balance the pressure. When the lifting shaft 6 falls to the lower end of the lifting sleeve 21, but the light hydrocarbon gas is still decreasing, the lifting shaft 6 drives the connecting structure 7 to move the lifting sleeve 21 downward. At this time, the first elastic member 9 provides a reaction force to the lifting sleeve 21, so that the lifting sleeve 21 is buffered downward, and the lifting shaft 6 is also buffered.

[0051] Among them, the first elastic member 9 is a first spring, which is sleeved on the outer wall of the above-mentioned lifting sleeve 21, and the upper end of the first spring is connected to the first annular fixing plate 8, and the lower end is connected to the top of the outer warehouse 1, so that the first spring can give the first annular fixing plate 8 an upward elastic force.

[0052] In some embodiments, as Figure 1 and Figure 2 As shown, the connecting structure 7 includes a second sleeve 71, which is sleeved onto the lower end of the lifting sleeve 21, and the lower end of the second sleeve 71 is provided with a clamping portion 72 extending toward the axial direction of the lifting sleeve 21; the upper end of the lifting shaft 6 is provided with a second annular fixing plate 61, and the clamping portion 72 is provided with a second elastic member 62 on the side facing the second annular fixing plate 61, and the second elastic member 62 is in contact with the second annular fixing plate 61.

[0053] Through the above-mentioned structural setting, the above-mentioned clamping part 72 abuts against the lifting shaft 6. When the lifting shaft 6 falls, the clamping part 72 can limit the lifting shaft 6 in the lifting sleeve 21. Since the clamping part 72 is provided with a second elastic member 62, after the lifting shaft 6 drops, the second annular fixing plate 61 abuts against the second elastic member, thereby performing secondary buffering on the falling of the lifting shaft 6.

[0054] The second elastic member 62 is a second spring, which is sleeved on the upper end of the lifting shaft 6 . The upper end of the second spring abuts against the second annular fixing plate 61 , and the lower end is connected to the clamping portion 72 .

[0055] In some embodiments, as Figure 1 As shown, the outer compartment 1 is provided with a first sleeve 10 , and the lifting sleeve 21 passes through the first sleeve 10 .

[0056] The first sleeve 10 limits the vertical movement of the lifting sleeve 21, thereby keeping the lifting shaft 6 in vertical motion.

[0057] In some embodiments, as Figure 1 and Figure 4 As shown, a first limiting tube 13 is provided at the center of the vent 31 , a first fixed shaft 14 is provided on the side wall of the first limiting tube 13 , the other end of the first fixed shaft 14 is connected to the annular protrusion 32 , and the lifting shaft 6 passes through the first limiting tube 13 .

[0058] Through the above-mentioned structural arrangement, the first position-limiting tube 13 limits the movement of the above-mentioned lifting shaft 6. The first position-limiting tube 13 allows the lifting shaft 6 to only move vertically up and down, thereby preventing the lifting shaft 6 from deviating.

[0059] In some embodiments, as Figure 1As shown, a second limiting tube 41 is provided at the center position of the ventilation pipe 4, a second fixed shaft 42 is provided on the side wall of the second limiting tube 41, and the other end of the second fixed shaft 42 is connected to the inner wall of the ventilation pipe 4, and the lifting shaft 6 can be extended into the second limiting tube 41.

[0060] Through the above-mentioned structural arrangement, the second position-limiting tube 41 secondarily limits the movement of the lifting shaft 6 , so that the lifting shaft 6 can only move vertically up and down through the second position-limiting tube 41 , thereby more effectively preventing the lifting shaft 6 from deviating.

[0061] In some embodiments, as Figure 1 The sealing disk 5 shown can be sleeved onto the annular protrusion 32 , and the inner side wall of the sealing disk 5 fits with the annular protrusion 32 .

[0062] Through the above-mentioned structural setting, the sealing disk 5 is in close contact with the above-mentioned annular protrusion 32 to prevent air leakage, and after the sealing disk 5 contacts the annular protrusion 32, it is more convenient to drive the annular protrusion 32 to rise.

[0063] In some embodiments, as Figure 1 As shown, a sealing gasket 15 is provided on the outer side wall of the annular protrusion 32 . After the sealing disc 5 is sleeved onto the annular protrusion 32 , the sealing gasket 15 is attached to the inner side wall of the sealing disc 5 .

[0064] The above-mentioned structural arrangement makes the seal between the sealing disk 5 and the annular protrusion 32 tighter, thereby effectively preventing the leakage of light hydrocarbon gas in the ventilation pipe 4.

[0065] In summary, the air inlet 11 of the breathing valve for the atmospheric pressure storage tank is connected to the upper end opening of the atmospheric pressure storage tank, the annular protrusion 32 is tightly fitted with the sealing disk 5, and the heights of the sealing liquid 16 on both sides are at the same horizontal line. When the outside environment and temperature rise, the petroleum in the atmospheric pressure storage tank is gasified, converted into light hydrocarbon gas and rises into the ventilation pipe 4. In this way, the light hydrocarbon gas can be temporarily stored in the ventilation pipe 4. When the light hydrocarbon gas in the ventilation pipe 4 exceeds the capacity of the ventilation pipe 4, the light hydrocarbon gas will push the sealing disk 5 to As the seal tank 3 moves upward, the lifting shaft 6 rises accordingly, pushing the annular protrusion 32 and the sealing tank 3 upward, thereby increasing the space to accommodate more light hydrocarbon gas. The sealing liquid 16 between the sealing tank 3 and the inner wall of the outer chamber 1 and the ventilation pipe 4 forms a liquid level difference due to maintaining constant pressure and sealing effect. However, when excessive light hydrocarbon gas enters the ventilation pipe 4 and the sealing tank 3, the light hydrocarbon gas will push the sealing tank 3 to the highest point, causing the sealing tank 3 to separate from the sealing liquid 16, allowing the light hydrocarbon gas to be released from the outlet 12.

[0066] When the outside temperature drops, the light hydrocarbon gas used in the atmospheric pressure storage tank is liquefied, and the pressure in the sealing tank 3 decreases, resulting in different pressures on both sides of the sealing disk 5, causing the sealing disk 5 to move downward, thereby causing the lifting shaft 6 and the elastic pulling structure 2 to move downward, and the sealing disk 5 to separate from the annular protrusion 32, allowing the outside gas to enter the atmospheric pressure storage tank through the ventilation pipe 4. At the same time, since the sealing liquid 16 between the sealing tank 3 and the inner wall of the outer warehouse 1 and the ventilation pipe 4 can keep the pressure in the sealing tank 3 unchanged, when the pressure on the upper part of the sealing disk 5 is too large, the first elastic member 9 and the second elastic member 62 can buffer the lifting sleeve 21 and the lifting shaft 6 during the descent process.

[0067] During the movement, the lifting shaft 6 is sleeved with the first limiting tube 13 and the second limiting tube 41 , so that the direction of the lifting shaft 6 is fixed during the movement, thereby effectively preventing the lifting shaft 6 from deviating.

[0068] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0069] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0070] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A breathing valve for a normal pressure storage tank, characterized in that: It comprises an outer compartment (1), a sealed tank (3) and a ventilation pipe (4); The outer bin (1) is provided with an air inlet (11) and an air outlet (12); the ventilation pipe (4) is provided at the bottom of the outer bin (1) and is in communication with the air inlet (11); and the air outlet (12) is higher than the sealed can (3); The sealing tank (3) is inverted onto the ventilation pipe (4), and a gap is formed between the side wall of the sealing tank (3) and the inner wall of the outer bin (1) and the side wall of the ventilation pipe (4), and a sealing liquid is provided between the sealing tank (3) and the inner wall of the outer bin (1) and the side wall of the ventilation pipe (4); The top of the sealed tank (3) is provided with a vent (31), the edge of the vent (31) is provided with an annular protrusion (32) extending toward the air inlet (11), and a sealing disk (5) is provided in the ventilation pipe (4), and the sealing disk (5) is arranged opposite to the annular protrusion (32); An elastic lifting structure (2) is provided on the outer chamber (1), and the elastic lifting structure (2) is connected to the sealing disk (5) so as to drive the sealing disk (5) to be tightly attached to the annular protrusion (32); A plurality of annular sleeves (17) are sequentially sleeved on the outside of the sealing tank (3), each annular sleeve (17) has the same height, and there is a gap between each annular sleeve (17); Along the direction from the sealing tank (3) toward the annular sleeve (17), the distance between the bottom of each annular sleeve (17) and the bottom of the sealing tank (3) increases in sequence; The sealing liquid (16) is sealed and filled between each of the annular sleeves (17).

2. A breathing valve for an atmospheric pressure storage tank according to claim 1, characterized in that: A plurality of partitions (19) are provided between the inner wall of the annular sleeve (17) and the outer wall of the sealing tank (3) away from the sealing tank (3); The partition (19) comprises a first plate portion (191), a second plate portion (192) fixedly arranged between two adjacent annular sleeves (17), and a connecting plate portion (193); the first plate portion (191) is fixedly arranged between the outer wall of the sealed tank (3) and the inner annular sleeve (17); and the connecting plate portion (193) is connected between the tops of the first plate portion (191) and the second plate portion (192).

3. The breathing valve for atmospheric pressure storage tank according to claim 1, characterized in that: The elastic lifting structure (2) comprises a lifting sleeve (21) and a lifting shaft (6); the lifting sleeve (21) passes through the outer compartment (1); a connecting structure (7) is provided between the lifting shaft (6) and the lifting sleeve (21); and the upper end of the lifting shaft (6) is fixed to the inside of the lifting sleeve (21) via the connecting structure (7); The sealing disk (5) is connected to the lower end of the lifting shaft (6), and a first annular fixing plate (8) is provided on the outer wall of the lifting sleeve (21). A first elastic member (9) is provided on the side of the first annular fixing plate (8) facing the outer bin (1), and the first elastic member (9) is fixedly connected to the outer bin (1).

4. A breathing valve for an atmospheric pressure storage tank according to claim 3, characterized in that: The connecting structure (7) includes a second sleeve (71), the second sleeve (71) is sleeved on the lower end of the lifting sleeve (21), and the lower end of the second sleeve (71) is provided with a clamping portion (72) extending toward the axial direction of the lifting sleeve (21); A second annular fixing plate (61) is provided at the upper end of the lifting shaft (6), and a second elastic member (62) is provided on the side of the clamping portion (72) facing the second annular fixing plate (61), and the second elastic member (62) is in contact with the second annular fixing plate (61).

5. The breathing valve for atmospheric pressure storage tank according to claim 3, characterized in that: The outer compartment (1) is provided with a first shaft sleeve (10), and the lifting sleeve (21) passes through the first shaft sleeve (10).

6. The breathing valve for atmospheric pressure storage tank according to claim 3, characterized in that: A first position-limiting tube (13) is provided at the center of the vent (31), a first fixed shaft (14) is provided on the side wall of the first position-limiting tube (13), the other end of the first fixed shaft (14) is connected to the annular protrusion (32), and the lifting shaft (6) passes through the first position-limiting tube (13).

7. The breathing valve for atmospheric pressure storage tank according to claim 3, characterized in that: A second position-limiting tube (41) is provided at the center of the ventilation pipe (4), a second fixed shaft (42) is provided on the side wall of the second position-limiting tube (41), the other end of the second fixed shaft (42) is connected to the inner wall of the ventilation pipe (4), and the lifting shaft (6) can extend into the second position-limiting tube (41).

8. The breathing valve for atmospheric pressure storage tank according to claim 1, characterized in that: The sealing disc (5) can be sleeved onto the annular protrusion (32), and the inner side wall of the sealing disc (5) fits with the annular protrusion (32).

9. The breathing valve for atmospheric pressure storage tank according to claim 8, characterized in that: A sealing gasket (15) is provided on the outer side wall of the annular protrusion (32), and after the sealing disc (5) is sleeved onto the annular protrusion (32), the sealing gasket is attached to the inner side wall of the sealing disc (5).

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