Airbags used in liquid storage devices and their usage methods

Abstract

This invention discloses an airbag for use in liquid storage devices and its method of application. The airbag is placed inside a reagent bottle and includes: a sealing bag, which is a hollow bag-shaped structure with a horizontal bottom surface. After inflation, the sealing bag floats above the liquid surface and its periphery is tightly fitted to the inner wall of the reagent bottle; the sealing bag is inflated through an inflation tube extending beyond the bottle opening; a compression bag is placed above the sealing bag, with its lower end face coplanar with the upper end face of the sealing bag, and the inflated compression bag is tightly fitted to the reagent bottle; the outlet tube of the compression bag extends beyond the bottle opening. This invention can effectively isolate volatile gases from the outside environment and can be used in reagent bottles stored in laboratories as well as in storage tanks used in industrial storage. The airbag for reducing exhaust gas emissions from storage tanks is easy and quick to install, requires no modification to the tank body, and can significantly reduce the cost of retrofitting existing old storage tanks for exhaust gas reduction.

Description

Technical Field

[0001] This invention relates to the field of liquid storage devices, and in particular to an airbag used in liquid storage devices and a method of using it. Background Technology

[0002] Storage of liquids containing organic matter includes the storage of laboratory liquid reagents and industrial storage. When storing liquids containing organic matter, if the liquid is highly volatile, it easily evaporates into the air, forming volatile organic compounds (VOCs) and causing air pollution. If the stored liquid is hygroscopic, it easily absorbs water, leading to a decrease in purity, especially when using hygroscopic liquid reagents in experiments, causing deviations in experimental results. If the stored liquid is easily oxidized by air, improper sealing can easily cause changes in the physicochemical properties of the liquid after oxidation, especially for high-purity liquid reagents, which will seriously affect subsequent experimental results.

[0003] Industries such as petrochemicals and chemicals have a large demand for industrial storage. Storage tanks are generally used to store organic liquids such as oils and organic chemicals. The organic liquids inside the tanks evaporate, producing volatile organic compounds (VOCs) that enter the upper gas space. These VOC-containing gases are released into the atmosphere due to the tanks' "breathing" phenomenon, causing pollution and resource loss. The venting and intake processes of storage tanks are generally referred to as "breathing." Breathing caused by liquid level changes during feeding and discharging is generally called "large breathing," while breathing caused by fluctuations in gas phase pressure within the tank due to diurnal temperature variations is called "small breathing." Typically, for oil and organic chemical storage tanks with high vapor pressure, floating roofs, external floating roof tanks, or internal floating roof tanks are installed to control VOC emissions. Installing floating roofs only reduces the concentration of exhaust gases to a certain extent and is far from meeting emission standards. Therefore, it is necessary to implement closed-loop induced draft treatment in external or internal floating roof tanks, and to recover VOCs or treat the induced gases with high-temperature oxidation.

[0004] Therefore, there is an urgent need to apply airbags to liquid storage devices, which can effectively isolate volatile gases from the outside environment. This method can be used in reagent bottles for laboratory storage as well as in storage tanks for industrial storage.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to provide an airbag for use in liquid storage devices, which can effectively isolate volatile gases from the outside environment. It can be used in reagent bottles for laboratory storage as well as in storage tanks for industrial storage.

[0007] Another objective of this invention is to provide an airbag for reducing exhaust gas emissions from storage tanks, which is easy and quick to install, requires no modification to the tank body, and can significantly reduce the cost of retrofitting existing old storage tanks for reducing exhaust gas emissions.

[0008] To achieve the above objectives, according to a first aspect of the present invention, an airbag for use in a liquid storage device is provided, disposed in a reagent bottle, comprising: a sealing bag having a hollow bag-like structure with a horizontal bottom surface, which floats above the liquid surface after inflation and is tightly fitted around the periphery of the sealing bag to the inner wall of the reagent bottle; the sealing bag is inflated through an inflation tube extending beyond the mouth of the reagent bottle; a compression bag disposed above the sealing bag with its lower end face coplanar with the upper end face of the sealing bag, which is tightly fitted to the reagent bottle after inflation; and an outlet tube of the compression bag extending beyond the mouth of the reagent bottle.

[0009] According to a second aspect of the present invention, an airbag for use in a liquid storage device is provided, disposed in an industrial storage tank, comprising: a sealing bag having a hollow bag-like structure with a horizontal bottom surface, which floats above the liquid surface after inflation and is tightly fitted around the inner wall of the storage tank; the sealing bag is inflated through an inflation tube extending beyond the air outlet of the storage tank; a compression bag disposed above the sealing bag with its lower end face coplanar with the upper end face of the sealing bag, which is tightly fitted to the storage tank after inflation; and an outlet tube of the compression bag extending beyond the air outlet of the storage tank.

[0010] Furthermore, in the above two technical solutions, the inflation pipe inlet may be equipped with a selectively opening and closing first seal and a first pressure gauge. The outlet pipe inlet may be equipped with a selectively opening and closing second seal and a second pressure gauge.

[0011] Furthermore, in the above two technical solutions, the sealing bag and compression bag of the airbag can be made of non-breathable flexible materials.

[0012] Furthermore, in the technical solution of the first aspect mentioned above, the airbag may further include: an inlet tube, which seals through the sealing bag and the compression bag, the upper end of the inlet tube protruding from the mouth of the reagent bottle, and the lower end located below the liquid surface in the reagent bottle. An outlet tube may be provided at the bottom of the reagent bottle.

[0013] Furthermore, in the technical solution of the second aspect mentioned above, a floating element may be provided at the bottom of the sealing bag to detach the bottom of the sealing bag from the liquid surface in the storage tank. A magnetic element may be provided on the upper inner wall of the compression bag to adhere to the upper part of the inner wall of the storage tank after the compression bag is inflated, thereby fixing the compression bag. A vent hole is provided at the top of the storage tank, and the airbag can be inserted into the storage tank through the vent hole in the uninflated state.

[0014] According to a third aspect of the present invention, the present invention provides a method for using an airbag in a liquid storage device, the airbag being disposed in a reagent bottle, comprising the following steps: A. Inserting an uninflated airbag into the mouth of the reagent bottle, and after the airbag falls to the liquid surface, inflating the sealing bag through an inflation tube until the air pressure in the sealing bag reaches a preset pressure value and the periphery of the sealing bag is tightly fitted to the inner wall of the reagent bottle; B. Inflating the compression bag through an outlet tube until the air pressure in the compression bag reaches a preset pressure value and the outer wall of the compression bag is tightly fitted to the inner wall of the reagent bottle, the airbag occupying the entire space above the liquid surface.

[0015] Furthermore, in the technical solution of the third aspect mentioned above, when it is necessary to add liquid to the reagent bottle: the gas in the compression bag can be released, liquid can be added through the liquid inlet tube that passes through the sealing bag and the compression bag, and then the compression bag can be re-inflated until the preset pressure value is reached.

[0016] Furthermore, in the technical solution of the third aspect mentioned above, when it is necessary to take liquid from the reagent bottle: the liquid outlet tube at the bottom of the reagent bottle can be opened, and after the liquid is taken out, air is continued to be injected into the compression bag until the outer wall of the compression bag is tightly attached to the inner wall of the reagent bottle again.

[0017] According to a fourth aspect of the present invention, a method for using an airbag in a liquid storage device is provided. The airbag is disposed in an industrial storage tank, comprising the following steps: A) Inserting an uninflated airbag into the tank vent; after the airbag reaches the liquid surface, inflating the sealed bag through an inflation tube until the air pressure in the sealed bag reaches a preset pressure value and the circumference of the sealed bag is tightly fitted against the inner wall of the tank; B) Inflating a compression bag through an outlet tube until the air pressure in the compression bag reaches a preset pressure value and the outer wall of the compression bag is tightly fitted against the inner wall of the tank. At this point, the airbag occupies the entire space above the liquid surface, and the upper part of the compression bag is magnetically attached and fixed to the inner wall of the tank, and the outlet tube is connected to the atmosphere. During large-scale breathing of the tank, both the inhaled and exhaled gases are kept as air.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1) The airbag of the present invention can be used in reagent bottles as well as in industrial storage tanks, and is suitable for all similar liquid storage devices;

[0020] 2) The airbag of the present invention is placed above the liquid surface of the liquid storage device (e.g., reagent bottle). After the sealing bag is inflated, it floats on the liquid surface and completely covers the entire liquid surface. It also fits tightly against the inner wall of the liquid storage device to form a primary seal. After the compression bag is inflated and expands, it fills the space above the sealing bag of the device to form a secondary seal. Therefore, it can effectively achieve sealing whether the liquid is stored or when adding or taking out the liquid. Under any circumstances, the liquid in the device can be completely isolated from the outside air, effectively preventing the liquid in the device from evaporating, absorbing water, or being oxidized and deteriorated by the air.

[0021] 3) The present invention allows liquid to be directly added below the liquid level in storage devices (e.g., reagent bottles) through the liquid inlet tube that passes through the sealed bag and the compression bag, while the sealed bag is still in an inflated and sealed state, thus preventing the liquid from evaporating, absorbing water, or being oxidized and deteriorated by the air during the addition of the liquid.

[0022] 4) When the airbag of the present invention is applied in industrial storage tanks, it can be used in internal floating roof or external floating roof storage tanks, as well as dome roof tanks or horizontal storage tanks. Since the airbag is easy and quick to install, it does not require disassembling the tank or modifying the tank, which can greatly reduce the cost of exhaust gas emission reduction and transformation of existing old storage tanks.

[0023] 5) The airbag of this invention can be directly placed on the floating roof of an internal or external floating roof tank. When placed in a dome-shaped or horizontal tank, the sealed bag floats on the liquid surface after inflation, completely covering the entire liquid surface and tightly adhering to the inner wall of the tank. After the compression bag is inflated, it fills the space above the sealed bag in the tank, forming a secondary seal, thus completely isolating the liquid inside the tank from the outside air. When the tank is "breathing," the tank inhales and exhales air through the compression bag of the airbag, effectively reducing exhaust emissions.

[0024] 6) Since the amount of gas generated by the small breathing of the storage tank is closely related to the gas phase space inside the storage tank, the present invention can also significantly reduce the amount of waste gas generated by the small breathing of the storage tank, effectively avoid liquid evaporation inside the equipment, and achieve near-zero emissions of waste gas from the storage tank.

[0025] 7) This invention expands the compression bag by inflating it with air. The magnetic element inside the compression bag makes the compression bag fit tightly against the top of the storage tank, so that the space at the top of the tank is also occupied by the compression bag. Even after the sealing of the compression bag outlet pipe is opened, the compression bag can still maintain a tight fit with the inner wall of the tank top under the action of the magnetic element, which plays a fixing role and prevents the compression bag from falling under its own weight and forming a gas phase space between the compression bag and the tank wall.

[0026] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it according to the contents of the specification, and to make the above and other objects, technical features and advantages of the present invention easier to understand, one or more preferred embodiments are listed below and described in detail with reference to the accompanying drawings. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the airbag in Embodiment 1 of the present invention.

[0028] Figure 2 This is a diagram showing the usage state of the airbag in a reagent bottle according to Embodiment 1 of the present invention.

[0029] Figure 3 This is a schematic diagram of the structure of the airbag in Embodiment 2 of the present invention.

[0030] Figure 4 This is a diagram showing the usage status of the airbag in an industrial storage tank according to Embodiment 2 of the present invention.

[0031] Explanation of key figure labels:

[0032] 1-Airbag, 11-Sealed bag, 110-Inflation tube, 1101-First seal, 1102-First pressure gauge, 12-Compression bag, 120-Outlet pipe, 1201-Second seal, 1202-Second pressure gauge, 121-Compression bag opening, 2-Magnetic element, 3-Inlet pipe, 31-Inlet pipe valve, 4-Outlet pipe, 41-Outlet pipe valve, 5-Floating element;

[0033] 100 - Reagent bottle, 200 - Storage tank, 201 - Vent, 202 - Rain cover. Detailed Implementation

[0034] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0035] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.

[0036] In this document, for ease of description, spatial relative terms such as “below,” “under,” “down,” “above,” “above,” “upper,” etc., are used to describe the relationship of one element or feature to another element or feature in the accompanying drawings. It should be understood that spatial relative terms are intended to encompass different orientations of an object in use or operation, in addition to those depicted in the figures. For example, if an object in the figure is flipped, an element described as “below” or “under” another element or feature would be oriented “above” that element or feature. Thus, the exemplary term “below” can encompass both the downward and upward orientations. An object may also have other orientations (rotated 90 degrees or other orientations), and the spatial relative terms used herein should be interpreted accordingly.

[0037] In this document, the terms "first," "second," etc., are used to distinguish two different elements or parts, and are not used to define specific positions or relative relationships. In other words, in some embodiments, the terms "first," "second," etc., can also be used interchangeably.

[0038] Example 1

[0039] like Figure 1 , 2 As shown, this embodiment provides an airbag for use in a liquid storage device. The airbag 1 can be placed inside a reagent bottle and can be made of an airtight flexible material, including but not limited to rubber, silicone, plastic, cloth, leather, and composite materials of the above materials. The airbag 1 includes a sealing bag 11 and a compression bag 12. The sealing bag 11 is a hollow bag-shaped structure with a horizontal bottom surface. After inflation, the sealing bag 11 can float above the liquid surface and its periphery is tightly fitted to the inner wall of the reagent bottle 100. The sealing bag 11 is inflated through an inflation tube 110 extending beyond the bottle opening. The compression bag 12 is positioned above the sealing bag 11, with its lower end face coplanar with the upper end face of the sealing bag. The compression bag 12 and the sealing bag 11 are relatively closed and in a non-communicating state. After inflation, the compression bag 12 can be tightly fitted to the reagent bottle 100. The outlet tube 120 of the compression bag 12 extends beyond the bottle opening of the reagent bottle 100.

[0040] Further as Figure 1 As shown, the inflation tube 110 passes through the compression bag 12, and its lower end is connected to the sealing bag 11. The interface is sealed. The upper end of the inflation tube 110 protrudes from the mouth of the reagent bottle 100 so that the sealing bag 11 can be inflated after the uninflated airbag is inserted into the bottle mouth. The exposed upper part of the inflation tube 110 is provided with a first sealing element 1101 and a first pressure gauge 1102. The first sealing element 1101 can be selectively opened and closed. It is opened at the beginning of inflation and closed at the end of inflation. It is opened before being inserted into the bottle mouth to evacuate the sealing bag 11. The first pressure gauge 1102 is used to monitor the pressure of the compressed air filled into the sealing bag 11 during inflation. When the preset pressure threshold is reached, inflation is stopped.

[0041] Further as Figure 1As shown, the lower end of the outlet pipe 120 is connected to the compression bag 12, and the interface is sealed. Alternatively, it can be integrally formed with the compression bag 12. The connection point is an opening 121, the size of which is adapted to the mouth of the reagent bottle 100. The upper end of the outlet pipe 120 is also exposed outside the mouth of the reagent bottle 100, so that the compression bag 12 can be inflated after the uninflated airbag is inserted into the bottle mouth. The exposed upper part of the outlet pipe 120 is provided with a second seal 1201 and a second pressure gauge 1202. The second seal 1201 can also be selectively opened and closed. It is opened at the beginning of inflation and closed at the end of inflation. It is opened before being inserted into the bottle mouth to evacuate the compression bag 12. The second pressure gauge 1102 is used to monitor the pressure of the compressed air in the compression bag 12 during inflation. When the preset pressure threshold is reached, inflation is stopped.

[0042] like Figure 2 As shown, when the airbag 1 of this embodiment 1 is applied to the reagent bottle 100, the specific method of use is as follows:

[0043] After fully deflating or evacuating the two bags of the airbag 1, place it into the reagent bottle containing the liquid through the mouth of the reagent bottle 100. The airbag 1 will fall to the liquid surface under its own weight. Open the first seal 1101 on the inflation tube 110 to inflate the sealed bag 11 with compressed air. Stop inflation when the first pressure gauge 1102 reads the preset pressure threshold P1, and close the first seal 1101. At this time, the sealed bag 11 is fully expanded and floats on the liquid surface, and the perimeter of the sealed bag 11 is tightly sealed to the inner wall of the reagent bottle 100. Fitting; Open the second seal 1201 on the outlet pipe 120, and fill the compression bag 12 with compressed air. When the second pressure gauge 1202 reads the preset pressure threshold P2, stop filling and close the second seal 1201. At this time, the compression bag 12 is fully unfolded and tightly attached to the inner wall of the reagent bottle 100. The opening 121 of the compression bag 12 is tightly attached to the bottle mouth of the reagent bottle 100, so that the gas phase space above the liquid surface in the reagent bottle 100 is completely occupied by the air bag 1, and the liquid in the reagent bottle 100 is completely isolated from the air.

[0044] It should be noted that when the airbag in Embodiment 1 is used in a reagent bottle, a liquid inlet tube 3 needs to be pre-installed in the middle of the airbag. This liquid inlet tube 3 seals through the sealing bag 11 and the compression bag 12. After the airbag is inserted into the reagent bottle as a whole, the upper end of the liquid inlet tube 3 protrudes from the bottle opening and is equipped with a liquid inlet valve 31, while the lower end is below the liquid level in the reagent bottle (see reference). Figure 2When liquid needs to be added to reagent bottle 100, the following method is used: Open the second seal 1201 of outlet pipe 120 to release the compressed air in compression bag 12. At this time, there is a certain space between compression bag 12 and the inner wall of reagent bottle, while sealing bag 11 is still in a sealed state to the lower liquid. Open inlet pipe valve 31 and add liquid to below the liquid surface through inlet pipe 3. Sealing bag 11 can gradually float up as the liquid level rises. After the liquid stops being injected, close inlet pipe valve 31 and refill compression bag 1 with compressed air through outlet pipe 120. Stop filling when the second pressure gauge 1202 reads the preset pressure threshold P2, and then close the second seal 1201 of outlet pipe.

[0045] When it is necessary to take liquid from reagent bottle 100, the following method can be used: Open the liquid outlet valve 41 on the liquid outlet pipe 4 at the bottom of reagent bottle 100. As the liquid flows out, the air bag 1 will drop as the liquid level drops. At this time, air can enter the bottle opening and will not generate negative pressure inside the bottle. After taking the liquid, close the liquid outlet valve 41, open the second seal 1201 of the outlet pipe, and fill the compression bag 12 with compressed air through the outlet pipe 120. When the second pressure gauge 1202 reads the preset pressure threshold P2 (at this time, the outer wall of the compression bag is tightly sealed to the inner wall of the reagent bottle again), stop the inflation and close the second seal 1201 of the outlet pipe.

[0046] In this embodiment, the airbag is placed above the liquid surface of the liquid storage device (e.g., a reagent bottle). After the sealing bag is inflated, it floats on the liquid surface and completely covers the entire liquid surface, forming a primary seal by tightly adhering to the inner wall of the liquid storage device. After the compression bag is inflated, it fills the space above the sealing bag of the device, forming a secondary seal. Therefore, it can effectively achieve sealing whether the liquid is stored, or when adding or removing the liquid. Under any circumstances, the liquid inside the device can be completely isolated from the outside air, effectively preventing the liquid inside the device from evaporating, absorbing water, or being oxidized and deteriorated by the air. Through the liquid inlet pipe that passes through the sealing bag and the compression bag, the liquid entering the storage device can be directly added below the liquid surface, and at this time the sealing bag is still in an inflated and sealed state, preventing the liquid from evaporating, absorbing water, or being oxidized and deteriorated by the air during the addition of the liquid.

[0047] Example 2

[0048] like Figure 3 , 4As shown, this embodiment provides an airbag for use in liquid storage equipment. The airbag 1 can be installed in an industrial storage tank. The airbag of this embodiment can be used in internal or external floating roof tanks, as well as dome-shaped or horizontal tanks. Because the airbag is easy and quick to install, without disassembling or modifying the tank, it can significantly reduce the cost of retrofitting existing old storage tanks for emission reduction. Similar to the airbag in Embodiment 1, the airbag 1 of this embodiment can be made of an airtight flexible material, including but not limited to rubber, silicone, plastic, fabric, leather, and composite materials of the above materials. The airbag 1 includes a sealing bag 11 and a compression bag 12. The sealing bag 11 is a hollow bag-shaped structure with a horizontal bottom. After inflation, the sealing bag 11 can float above the liquid surface, and the circumference of the sealing bag 11 is tightly fitted to the inner wall of the storage tank 200. Preferably, but not limitingly, the bottom of the sealing bag 11 is provided with a floating element 5, which can be used to detach the bottom of the sealing bag from the liquid surface in the storage tank, effectively preventing the liquid from corroding the sealing bag 11 and extending the service life of the airbag. The sealed bag 11 is inflated through an inflation pipe 110 extending beyond the vent 201 of the storage tank. A compression bag 12 is positioned above the sealed bag 11, with its lower end face coplanar with the upper end face of the sealed bag. The compression bag 12 and the sealed bag 11 are relatively closed and not connected. The inflated compression bag 12 can fit tightly against the inner wall of the storage tank 200. Preferably, but not limitingly, the upper inner wall of the compression bag 12 is provided with a magnetic element 2, which is used to adhere to the inner wall of the storage tank after the compression bag 12 is inflated (i.e., after it fits tightly against the inner wall of the storage tank), thus fixing the compression bag 12 to the inner wall of the storage tank. The outlet pipe 120 of the compression bag 12 extends beyond the vent 201 of the storage tank 200.

[0049] Further as Figure 3 As shown, the inflation tube 110 passes through the compression bag 12, and its lower end is connected to the sealed bag 11. The interface is sealed. The upper end of the inflation tube 110 is exposed through the vent hole of the storage tank, so that the sealed bag 11 can be inflated after the uninflated airbag is placed through the vent hole 201 of the storage tank. The exposed upper part of the inflation tube 110 is provided with a first sealing element 1101 and a first pressure gauge 1102. The first sealing element 1101 can be selectively opened and closed. It is opened when inflation begins and closed when inflation ends. It can be opened before being placed through the vent hole of the storage tank to evacuate the sealed bag 11. The first pressure gauge 1102 is used to monitor the pressure of the compressed air filled into the sealed bag 11 during inflation. When the preset pressure threshold is reached, inflation is stopped.

[0050] Further as Figure 3As shown, the lower end of the outlet pipe 120 is connected to the compression bag 12, and the interface is sealed. Alternatively, it can be integrally formed with the compression bag 12. The connection point is an opening 121, the size of which is adapted to the diameter of the vent hole 201 of the storage tank. The upper end of the outlet pipe 120 is also exposed through the vent hole 201 to inflate the compression bag 12 after the uninflated airbag is placed into the storage tank. The exposed upper part of the outlet pipe 120 is equipped with a second seal 1201 and a second pressure gauge 1202. The second seal 1201 can also be selectively opened and closed, opening at the start of inflation and closing at the end of inflation. It can be opened before being placed into the storage tank to evacuate the compression bag 12. The second pressure gauge 1102 is used to monitor the pressure of the compressed air in the compression bag 12 during inflation. When the preset pressure threshold is reached, inflation is stopped.

[0051] like Figure 4 As shown, when the airbag 1 of this embodiment 1 is applied to the storage tank 200, during the tank's large-scale breathing, both the tank inhales and exhales air. Therefore, this embodiment not only achieves the technical effect of embodiment 1 but also reduces the emissions of exhaust gas from the storage tank. The specific usage method is as follows:

[0052] After fully deflating or evacuating the two bags of airbag 1, place it into storage tank 200 through vent 201. Airbag 1 falls to the liquid surface under its own weight. Open the first seal 1101 on the inflation tube 110 to inflate compressed air into the sealed bag 11. Stop inflation when the first pressure gauge 1102 reads the preset pressure threshold P1, and close the first seal 1101. At this time, the sealed bag 11 is fully expanded and floats on the liquid surface. Since the bottom of the sealed bag is equipped with a floating element 5, the sealed bag does not directly contact the liquid surface. At this time, the perimeter of the sealed bag 11 is tightly fitted with the inner wall of storage tank 200 to achieve a seal. Open the second seal 1201 on the outlet pipe 120 and fill the compression bag 12 with compressed air. Stop filling when the second pressure gauge 1202 reads the preset pressure threshold P2, and close the second seal 1201. At this time, the compression bag 12 is fully expanded and tightly attached to the inner wall of the storage tank 200. The opening 121 of the compression bag 12 is tightly attached to the storage tank 200 and the vent 201. At this time, the magnetic element 2 is attracted to the inner wall of the top of the storage tank 200 and fixes the upper part of the compression bag 12, thereby completely occupying the space above the liquid surface in the storage tank 200 and completely isolating the liquid in the storage tank 200 from the outside air. At this time, open the second seal 1201 on the outlet pipe 120. When the storage tank is breathing, the storage tank inhales and exhales only air (that is, when there is no gas phase space between the compression bag and the inner wall of the storage tank, air is inhaled and exhaled through the inside of the compression bag 12), thereby achieving the reduction of exhaust gas emissions from the storage tank.

[0053] In this embodiment, the airbag can be placed directly on the floating roof of an internal or external floating roof tank. When placed in a dome-shaped or horizontal tank, the airbag floats on the liquid surface after inflation, completely covering the entire liquid surface and adhering tightly to the inner wall of the tank. After the compressed bag is inflated, it fills the space above the airbag in the tank, forming a secondary seal, thus completely isolating the liquid inside the tank from the outside air. When the storage tank undergoes a large breath, it inhales and exhales air through the compression bag of the airbag. In addition, since the amount of gas generated by the small breath is closely related to the gas phase space inside the storage tank, the amount of waste gas generated by the small breath can be significantly reduced, effectively preventing liquid evaporation inside the equipment and achieving near-zero emissions of storage tank waste gas. In this embodiment, by inflating the compression bag with air, the magnetic element installed inside the compression bag keeps the compression bag tightly attached to the top of the storage tank, so that the space at the top of the tank is also occupied by the compression bag. Even after the sealing of the compression bag outlet pipe is opened, the compression bag can still maintain a tight fit with the inner wall of the tank top under the action of the magnetic element, playing a fixing role and preventing the compression bag from falling under its own weight and forming a gas phase space between the compression bag and the tank wall.

[0054] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. Any simple modifications, equivalent changes, and alterations made to the foregoing exemplary embodiments should fall within the scope of protection of the present invention.

Claims

1. An airbag for use in a liquid storage device, characterized by, The airbag is arranged in an industrial storage tank, and comprises the following parts: a sealed bag, which is a hollow bag structure with a horizontal bottom surface, and after being inflated, the sealed bag floats above the liquid surface and the peripheral edge of the sealed bag closely adheres to the inner wall of the storage tank to form a primary seal; the sealed bag is inflated through an inflation pipe extending out of the gas outlet of the storage tank; a compression bag arranged above the sealed bag and having a lower end surface coplanar with the upper end surface of the sealed bag, and after being inflated, the compression bag closely adheres to the storage tank to form a secondary seal; a magnetic element is arranged on the inner wall of the upper part of the compression bag, and is used to adsorb on the upper part of the inner wall of the storage tank after the compression bag is inflated and fix the compression bag, so that the space above the liquid surface in the storage tank is completely occupied, the liquid in the storage tank is completely isolated from the air outside, and the air is inhaled and exhaled through the inside of the compression bag without gas phase space between the compression bag and the inner wall of the storage tank; the outlet pipe of the compression bag extends out of the gas outlet of the storage tank; the magnetic element arranged in the compression bag closely adheres the compression bag to the top of the storage tank, so that the space of the tank top is also occupied by the compression bag, and even after the outlet pipe seal of the compression bag is opened, the compression bag can still closely adhere to the inner wall of the tank top under the action of the magnetic element, thereby playing a fixing role and avoiding the formation of gas phase space between the compression bag and the tank wall under the action of the gravity of the compression bag.

2. The gas cell in a liquid storage device of claim 1, wherein, The inflation pipe is provided with a first seal and a first pressure gauge which are selectively opened and closed.

3. The bladder in a liquid storage device of claim 1, wherein, The outlet pipe is provided with a second seal and a second pressure gauge which are selectively opened and closed.

4. The bladder in a liquid storage device of claim 1, wherein, The sealed bag is provided with a floating element at the bottom, which is used to separate the bottom of the sealed bag from the liquid surface in the storage tank.

5. The bladder in a liquid storage device of claim 1, wherein, The top of the storage tank is provided with a vent hole, and the airbag is placed into the inside of the storage tank from the vent hole in an un-inflated state.

6. The bladder in a liquid storage device of claim 1, wherein, The sealed bag and the compression bag of the airbag are made of non-air-permeable flexible material.

7. A method of using an airbag in a liquid storage device, comprising: The airbag is arranged in an industrial storage tank, and comprises the following steps: A. The un-inflated airbag is placed into the storage tank from the vent hole, and the sealed bag is inflated through the inflation pipe until the air pressure in the sealed bag reaches a preset pressure value and the peripheral edge of the sealed bag closely adheres to the inner wall of the storage tank after the airbag falls to the liquid surface; B. The compression bag is inflated through the outlet pipe until the air pressure in the compression bag reaches a preset pressure value and the outer wall of the compression bag closely adheres to the inner wall of the storage tank, at this time, the airbag occupies the space above the liquid surface, and the upper part of the compression bag is adsorbed and fixed on the inner wall of the storage tank through the magnetic element, and the outlet pipe is connected to the atmosphere.

8. The air bag use method according to claim 7, wherein When the storage tank performs a large breathing, the inhaled and exhaled gas of the storage tank is air.

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