CN111750265A

CN111750265A - Low-temperature liquid gas storage bottle

Info

Publication number: CN111750265A
Application number: CN202010422335.8A
Authority: CN
Inventors: 刘济华
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-05-15
Filing date: 2020-05-15
Publication date: 2020-10-09
Anticipated expiration: 2040-05-15
Also published as: CN111750265B

Abstract

A low-temperature liquid gas storage bottle belongs to the field of safety protection, and particularly relates to a storage bottle for supplying a gas source to operating personnel under polluted air. The invention relates to a low-temperature liquid gas storage bottle, wherein a shell is provided with a heat absorption layer in addition to a vacuum heat insulation layer. The heat absorption layer absorbs a small part of heat which cannot be isolated by the vacuum heat insulation layer by utilizing the principle that the gas absorbs heat when the liquid state is changed into the gas state and the temperature is not changed, so that the stored liquid gas is kept in a low-temperature state, and the liquid gas can be stored for a long time. When the gas is in a liquid state, the pressure borne by the storage bottle is not high, and the sealing cover plays a role of a safety valve and has certain safety. The required bottle shell every layer next door of low pressure state is thinner, makes the weight of storing the bottle lighter, is convenient for transport and carry. If the low-temperature liquid gas storage bottle contains liquid air, the low-temperature liquid gas storage bottle can be used as a gas supply source in a harmful gas environment, and has wide application value.

Description

Low-temperature liquid gas storage bottle

Technical Field

The invention belongs to the field of safety protection, and particularly relates to a storage bottle for supplying air source to operators in polluted air.

Background

In the polluted air environment, workers must firstly solve the breathing problem, particularly the space operation of leaking harmful gas, virus and the like, and the workers only need to carry a mask to supply fresh air. The fresh air supplied by the prior art is filled in a high-pressure tank, and the pressure is generally up to 40MPa for containing more air. Because the air tank for containing air is required to bear higher pressure, the tank wall is thicker, the tank body is heavier, and certain high-pressure expansion and cracking danger exists, so that the air tank is not suitable for carrying. A gas of the same mass is less voluminous when in a liquid state than when at a high pressure, and therefore contains more mass of the gas in the liquid state than the gas at the same volume and pressure.

The known liquid gas storage dewar tank has a vacuum heat insulating layer to keep the liquid gas in low temperature. If the total weight of the dewar tank containing the liquid gas is 30Kg, the total weight of the dewar tank containing the same mass of gas is 200 Kg. The liquid state for storing the gas supply source is smaller than the gas in the high pressure state, and the total weight of the stored gas with the same mass is about 7 times smaller. Although the pressure born by the liquid gas contained in the dewar is not high, the vacuum heat insulation layer cannot reach absolute vacuum and is difficult to reach 100 percent heat insulation, so that the long-term storage of the liquid gas is difficult to guarantee in a non-sealing state.

At present, the dewar tank is required to bear higher pressure to contain liquid gas to achieve a sealed state. If the Dewar tank containing the liquid gas is not sealed, the Dewar tank does not need to bear larger pressure, but the stored liquid gas can slowly leak. In order to store liquid gas for a longer time, people research on a vacuum heat insulation layer of a dewar tank at present. The method of increasing the thickness of the vacuum heat insulation layer, vacuumizing the multi-layer carbon fiber at intervals and the like is adopted, so that a certain effect is achieved. On the basis, a large amount of experimental research is carried out on the liquid gas storage tank capable of storing the liquid gas for a long time, and finally, the liquid gas storage bottle which is light in weight, low in temperature, convenient to carry and carry is invented.

Disclosure of Invention

The invention relates to a low-temperature liquid gas storage bottle, wherein a shell is provided with a low-temperature heat-absorbing layer besides a vacuum heat-insulating layer. The heat absorption layer absorbs a small part of heat which cannot be isolated by the vacuum heat insulation layer by utilizing the principle that the gas changes from liquid to gas to absorb heat without changing the temperature, so that the stored liquid gas is kept in the original low-temperature state. As long as the gas is in the liquid state, the pressure to which the storage bottle is subjected is low. The walls of the bottle housing required for the low pressure state need not be subjected to a high pressure, thereby reducing the weight of the stored bottles.

When the liquid gas in the heat absorbing layer is affected by heat which is not isolated by the outer insulating layer at a small part, the gas will change from liquid to gas by absorbing the heat, and the gas will absorb the heat when changing into gas, although the temperature is not increased. When the pressure of the heat absorption layer is increased to a certain value, the safety valve automatically discharges gas to reduce the pressure of the heat absorption layer. The pressure reduction process of the heat absorption layer needs to absorb heat, the heat insulation layer is arranged on the outer layer, heat cannot be continuously supplied, the pressure in the heat absorption layer can be reduced quickly, and the safety valve cannot leak air any more. The heat absorption layer absorbs heat through the gasification and decompression processes to keep the original low-temperature state of the liquid gas in the bottle, so that the liquid gas in the bottle can be stored for a long time.

In order to fully utilize the characteristic that the gas is changed from liquid to gas and needs vaporization heat, a delivery pipe for changing the liquid into the gas is arranged in the liquid gas. When the liquid state changes into the gas state, the temperature is not increased, but heat is absorbed, so that the gas state generated in the guide pipe is used for absorbing the heat of the liquid gas, and the temperature of the liquid gas is still kept in the original low-temperature state. When the liquid state changes into the gas state, pressure is generated, and the gas with the pressure is discharged from the delivery pipe through the one-way valve. The pressure reduction process of the exhausted gas with pressure needs to absorb heat, so that the pressure in the conduit is quickly reduced, and the gas is not exhausted any more.

The sealing cover of the low-temperature liquid gas storage bottle has the function of a safety valve. The sealing cover is vacuum and has heat insulation effect. When the pressure in the storage bottle exceeds a certain value, the inner layer of the sealing cover is extruded to deform, and air leakage is caused. When the pressure of the heat absorption layer is reduced to safe air pressure, the deformation of the inner layer of the sealing cover is restored to the original state and the air is not leaked any more. Once the pressure in the reservoir increases suddenly, the closure will be ejected, substantially deflating the reservoir housing.

The invention mainly stores the liquid gas by heat insulation and heat absorption, so that the liquid gas is kept in a low-temperature and low-pressure state. Because the safe pressure value of the storage bottle can be designed to be lower, the storage bottle shell does not need to bear higher pressure, and the thickness of each layer of partition walls can be reduced so as to reduce the whole weight of the storage bottle. In order to further reduce the weight of the bottle shell and increase the strength of the shell, a method for installing a support ring in each layer of partition wall is adopted to increase the strength of each layer of partition wall and simultaneously play a role in fixing each layer of partition wall. The support ring in the vacuum insulation layer needs to be made of a material with poor thermal conductivity, and the support ring in the heat absorption layer needs to be made of a material with low thermal conductivity. The invention is further illustrated with reference to the following figures and examples.

Drawings

Fig. 1 is an overall front sectional view of a cryogenic liquid gas storage cylinder according to the present invention.

FIG. 2 is an elevational and plan view of a cryogenic liquid gas storage bottle support ring of the present invention.

FIG. 3 is an assembled view of a cryogenic liquid gas storage cylinder of the present invention.

Fig. 4 is a schematic view of the closure of the present invention.

Figure 5 is a schematic view of the check valve of the present invention.

In the figure: 1. a housing; 2. an inner shell; 3. an inner container; 4. a conduit; 5. a tube support; 6. a fixing ring; 7. a stent ring; 8. a transfusion tube; 9. sealing the cover; 10. a vacuum check valve; 11. a liquid-gas check valve; 12. a liquid inlet check valve; 13. a fixed mount; 14. a spiral column.

Detailed Description

The shell of the low-temperature liquid gas storage bottle is composed of an outer shell (1), an inner shell (2) and an inner container (3) which are ellipsoidal or cylindrical and have different curvature radiuses, and is shown in figure 1. A vacuum heat insulation layer is formed between the outer shell (1) and the inner shell (2); a liquid gasification heat absorption layer is arranged between the inner shell (2) and the inner container (3). A plurality of bracket rings (7) are arranged between the inner shell (2) and the outer shell (1) in the vacuum heat insulation layer, and a plurality of holes are arranged on the bracket rings (7); a plurality of fixing rings (6) for fixing are also arranged between the inner container (3) and the inner shell (2), and a plurality of holes are also arranged on the fixing rings (6) to lead the gas to be conducted, as shown in figure 2. The fixing ring (6) and the support ring (7) are made of materials with good heat insulation effect, and the inner container (3) and the inner shell (2) are supported and fixed and need good heat insulation.

In the inner container (3), a liquid-gas one-way valve (11) is arranged at the bottom, and the liquid-gas one-way valve (11) is connected with the guide pipe (4) inwards. The conduit (4) is a gas delivery pipe for changing liquid state into gas state, and the gas changes from liquid state into gas state, although the temperature does not change, but needs vaporization heat to absorb heat. When the gas is changed from liquid state to gas state, the pressure is increased, the gas with increased pressure is discharged through the liquid-gas one-way valve (11), and the heat absorption is also needed when the pressure of the discharged gas is reduced. The gas discharged by the liquid-gas one-way valve (11) enters the heat absorption layer, and then is discharged out from the bottle mouth through the heat absorption layer. The process of gas discharge decompression of the heat absorption layer also absorbs heat and absorbs heat from the inner shell (2) and the inner container (3) so as to maintain the low-temperature state of the inner container (3).

The storage bottle shell composed of the outer shell (1), the inner shell (2) and the inner container (3) is divided into an upper part and a lower part when being manufactured, as shown in figure 3. The upper part of the bottle shell is fixed through a fixing ring (6) and a support ring (7) respectively, the inner shell and the outer shell are bonded or welded at the bottle mouth, and the upper end of the inner container (3) is provided with a liquid inlet one-way valve (12). The one-way valve is externally connected with the transfusion tube (8), and the transfusion tube (8) is fixed on the bottle mouth through a fixing frame (13). The upper end in the inner container (3) is provided with a fixed pipe bracket (5), the lower half part of the inner container (3) is provided with a liquid-gas one-way valve (11) and a guide pipe (4), and the lower half part and the upper half part of the inner container (3) are connected in an abutting mode. After the inner container (3) is installed, the fixing ring (6) is installed and fixed in the lower half part of the inner shell (2), and then the lower half part and the upper half part of the inner shell (2) are connected in an abutting mode. After the vacuum one-way valve (10) and the support ring (7) are arranged on the lower half part of the shell (1), the lower half part and the upper half part of the shell (1) are connected in an abutting mode. The storage bottle shell is manufactured by assembling from inside to outside, and different adhesives are selected according to different materials for butting the upper part and the lower part and can also be welded on.

After the low-temperature liquid gas storage bottle is manufactured, the heat insulation layer is vacuumized through the vacuum one-way valve (10), and then liquid gas is filled into the inner container (3) through the liquid inlet one-way valve (12) in a low-temperature environment through the liquid conveying pipe (8). When liquid gas is filled into the inner container (3), the gas originally existing in the inner container (3) is expelled through the guide pipe (4). When the inner container (3) is filled with liquid gas, the liquid gas is continuously filled into the heat absorption layer through the conduit (4) and the liquid gas one-way valve (11), and when the heat absorption layer is filled with the liquid gas, the liquid gas flows out of the storage bottle opening. When the liquid gas flows out of the storage bottle opening, the liquid gas in the storage bottle is filled, the filling of the liquid gas is stopped, the sealing cover (9) is closed, and the filling of the liquid gas in the storage bottle is completed.

The space above the cover (9) as shown in fig. 4 is evacuated in order to provide thermal insulation. A spiral column (14) is arranged in the center of the inner layer of the sealing cover (9) and is tightly plugged into or screwed into the infusion tube (8), and when the sealing cover (9) is applied with a certain outward acting force, the spiral column (14) is released and pulled out. When the pressure of the heat absorption layer in the storage bottle is increased, the conical surface of the inner layer in the sealing cover (9) is firstly extruded, so that the inner layer of the sealing cover (9) is deformed and deflated. When the gas in the heat absorption layer leaks, the heat absorption is needed, meanwhile, the pressure is reduced, and the sealing cover (9) is restored and deformed so that the gas does not leak. The designed closure cap (9) also functions as a safety valve in practice.

The low-temperature liquid gas storage bottle body is provided with three one-way valves which have the same structure, but have different sizes, and the spring coefficients of the top sealing ball are also different, as shown in figure 5. The vacuum one-way valve (10) is screwed on the shell (1) by a screw thread and is used for sucking vacuum; when the vacuum one-way valve (10) is unscrewed, air can enter, the heat insulation degree of the heat insulation layer is reduced, and the heat absorption layer obtains heat, so that liquid gas in the bottle can be quickly discharged. The liquid-gas one-way valve (11) is arranged on the inner container (3) and is used for discharging liquid gas when the liquid gas becomes gaseous state, and the gas in the heat absorption layer can not flow into the inner container (3). The liquid inlet one-way valve (12) is arranged on the inner container (3) and is used for filling liquid gas into the inner container (3) only and not flowing out of the inner container (3) through the infusion tube (8). The spring coefficient used in each one-way valve is determined according to the pressure to be born by the walls of the outer shell (1), the inner shell (2) and the inner container (3) and the area of the air outlet, so that the pressure in the heat absorption layer and the inner container is in a safe range.

The low-temperature liquid gas storage bottle is mainly used for containing nontoxic and harmless liquid gas, particularly liquid air, and can be used as a gas supply source for improving ambient air. The liquid air stored in the low-temperature storage bottle can be used as a source of fresh air and is convenient to carry and carry. The storage bottle can be used as a supplied air source in fire escape, medical operation in virus environment and the like, and can help people to avoid the damage and infection of toxic and harmful gases. The invention has wide application value in the field of safety protection.

Claims

1. The utility model provides a low temperature liquid gas storage bottle comprises shell (1), inner shell (2), inner bag (3), pipe (4), closing cap (9), spiral post (14), mount (13), solid fixed ring (6), support ring (7), transfer line (8), check valve (10, 11, 12), its characterized in that: a heat absorption layer is formed between the inner shell (2) and the inner container (3), and the conduit (4) leads gas into the heat absorption layer through the one-way valve (11).

2. A cryogenic liquid gas storage cylinder according to claim 1, wherein: the space at the upper end of the sealing cover (9) is vacuumized, and the center of the inner layer is provided with a spiral column (14) inserted or screwed into the infusion tube (8).

3. A cryogenic liquid gas storage cylinder according to claim 1, wherein: a fixing ring (6) is arranged between the inner shell (2) and the inner container (3), a bracket ring (7) is arranged between the outer shell (1) and the inner shell (2), and a plurality of holes are formed in the fixing ring (6) and the bracket ring (7).