A device for testing the tightness of frozen soil at low temperatures

Abstract

The utility model proposes a kind of low temperature under frozen soil's leakproofness testing device, specifically on low temperature liquid storage technical field, low temperature under frozen soil's leakproofness testing device includes sealing assembly and cooling assembly, in which: the sealing assembly inside is provided with accommodating space, the cooling assembly is used to cool the accommodating space, the sealing assembly top and bottom are connected with air inlet pipe and air outlet pipe, the top and bottom of the accommodating space each are provided with sealing ring, the accommodating space inside contains frozen soil layer, the frozen soil layer top and bottom are respectively with sealing ring contact, the cooling assembly is cooled to frozen soil layer and makes the water-containing soil freezing between sealing ring and the frozen soil layer form crystal seal, the utility model is cooled using cooling assembly, so that frozen soil layer and sealing ring are through water-containing soil freezing to form crystal, to complete the sealing of frozen soil layer and sealing ring, when more accurate and convenient to the frozen soil layer internal leakproofness is detected.

Description

Technical Field

[0001] This utility model relates to the field of cryogenic liquid storage technology, and in particular to a sealing test device for frozen soil at low temperatures. Background Technology

[0002] Hydrogen is considered an important component of the future low-carbon new energy structure, and the importance of large-scale hydrogen storage technology is becoming increasingly prominent. Currently, large-scale hydrogen storage using underground space can reduce costs and improve economic efficiency and energy security.

[0003] Underground hydrogen storage requires consideration of the cavern's sealing. Natural permafrost has the advantage of sealing underground natural gas, but permafrost also requires consideration of environmental sealing. Traditional sealing methods use the pre-tightening force of bolts to generate sufficient pressure between the gasket and the flange sealing surface, so that the deformation of the gasket surface is sufficient to fill the microscopic unevenness of the flange sealing surface, thereby achieving the purpose of sealing. However, because metal flanges and gaskets will shrink in low-temperature environments, the gasket seal will fail during the process of changing from high ambient temperature or room temperature to low temperature.

[0004] Furthermore, since the roughness of frozen soil is greater than that of metal flanges, the contact sealing between frozen soil and gasket is more difficult than the contact sealing between traditional gasket and metal flange, which makes it more difficult to test the airtightness. In view of this, this utility model proposes a sealing performance testing device for frozen soil at low temperature. Utility Model Content

[0005] To address the problem of permafrost's sealing performance easily failing, this invention proposes a sealing performance testing device for permafrost at low temperatures.

[0006] This utility model is achieved through the following technical solution:

[0007] This utility model proposes a sealing performance testing device for frozen soil at low temperatures, comprising a sealing component and a cooling component, wherein:

[0008] The sealing assembly has an internal receiving space, and the cooling assembly is used to cool the receiving space. The top and bottom of the sealing assembly are connected to an air inlet pipe and an air outlet pipe. A sealing ring is provided at the top and bottom of the receiving space. The receiving space contains a frozen soil layer, and the top and bottom of the frozen soil layer are in contact with the sealing rings. The cooling assembly is used to cool the frozen soil layer and cause the water-containing soil between the sealing ring and the frozen soil layer to freeze and form a crystal seal, forming a gas chamber located between the upper and lower sides of the frozen soil layer and the sealing assembly. The air inlet pipe is used to introduce gas into the gas chamber for testing.

[0009] Furthermore, the sealing assembly includes an upper flange, a lower flange, screws, and nuts. The screws are disposed between the upper flange and the lower flange, and both ends of the plurality of screws are fixedly connected to the upper flange and the lower flange by the nuts, forming a receiving space located inside the plurality of screws.

[0010] Furthermore, the bottom of the upper flange and the top of the lower flange are provided with grooves, the upper flange and the lower flange are attached to the upper and lower sides of the frozen soil layer, and a gas chamber is formed between the grooves and the frozen soil layer.

[0011] Furthermore, the cooling component includes a heat exchange coil disposed on the outside of the permafrost layer or a retaining sleeve disposed on the outside of the receiving component, the retaining sleeve being filled with a cryogenic liquid.

[0012] Furthermore, the cooling assembly also includes an inlet pipe disposed at one end of the heat exchange coil and an outlet pipe disposed at the other end of the heat exchange coil, or includes an inlet pipe disposed on one side of the retaining sleeve and an inlet pipe disposed on the other side of the retaining sleeve.

[0013] The beneficial effects of this utility model are:

[0014] The sealing test device for frozen soil at low temperatures proposed in this utility model uses a cooling component to cool the soil, causing the frozen soil layer and the sealing ring to freeze and form crystals through the water-containing soil, thereby completing the sealing of the frozen soil layer and the sealing ring. This can avoid the failure of sealing caused by the shrinkage of the flange and gasket when the temperature changes, and is more accurate and convenient for testing the air permeability of the internal sealing of the frozen soil layer. Attached Figure Description

[0015] Figure 1 This is a cross-sectional perspective view of the sealing performance testing device for frozen soil at low temperatures according to this utility model.

[0016] Figure 2 This is an overall structural diagram of the sealing performance testing device for frozen soil at low temperatures according to this utility model.

[0017] Figure 3 This is a structural diagram of another embodiment of the sealing performance testing device for frozen soil at low temperatures according to this utility model;

[0018] In the diagram: 1. Inlet pipe, 2. Nut, 3. Upper flange, 4. Screw, 5. Lower flange, 6. Retaining sleeve, 7. Liquid inlet pipe, 8. Gas outlet pipe, 9. Liquid outlet pipe, 10. Frozen soil layer, 11. Sealing ring, 12. Gas chamber, 13. Heat exchange coil.

[0019] The purpose, features, and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] To more clearly and completely illustrate the technical solution of this utility model, the following description, in conjunction with the accompanying drawings, will provide further details.

[0021] Please refer to Figures 1-3 This utility model proposes a sealing performance testing device for frozen soil at low temperatures, comprising a sealing component and a cooling component, wherein:

[0022] The sealing assembly has an internal containment space. The cooling assembly is used to cool the containment space. The top and bottom of the sealing assembly are connected to an air inlet pipe 1 and an air outlet pipe 8. The top and bottom of the containment space are each provided with a sealing ring 11. The containment space contains a frozen soil layer 10. The top and bottom of the frozen soil layer 10 are in contact with the sealing ring 11. The cooling assembly is used to cool the frozen soil layer 10 and cause the water-containing soil between the sealing ring 11 and the frozen soil layer 10 to freeze and form a crystal seal, forming a gas chamber 12 located between the upper and lower sides of the frozen soil layer 10 and the sealing assembly. The air inlet pipe 1 is used to introduce gas into the gas chamber 12 for testing.

[0023] In a specific embodiment, the air inlet pipe 1 is used to introduce the gas for testing, and the containment space is used to contain the frozen soil layer 10. Subsequently, the cooling component cools down the frozen soil layer 10, and the water-containing soil between the frozen soil layer 10 and the sealing ring 11 is cooled and crystals are formed. The crystals adhere to the frozen soil layer 10 and the sealing ring 11 to form a seal. The formed crystal structure can prevent gas leakage. After the seal is completed, a certain amount / pressure of helium gas is introduced into the air inlet pipe 1. After maintaining this for a period of time, it is detected whether there is helium gas leakage in the gas pipe 8. This can complete the test of the internal sealing performance of the frozen soil layer 10. This utility model uses the cooling component to cool down the frozen soil layer 10, so that the water-containing soil between the frozen soil layer 10 and the sealing ring 11 freezes and forms crystals, thereby completing the seal between the frozen soil layer 10 and the sealing ring 11. Subsequently, the air inlet pipe 1 is used to introduce gas into the frozen soil layer 10 and detect whether there is leakage in the gas pipe 8. This makes the test of the internal sealing performance of the frozen soil layer 10 more accurate and convenient.

[0024] Furthermore, the sealing assembly includes an upper flange 3, a lower flange 5, a screw 4, and a nut 2. The screw 4 is disposed between the upper flange 3 and the lower flange 5. Both ends of the multiple screws 4 are fixedly connected to the upper flange 3 and the lower flange 5 by the nuts 2, forming a receiving space located inside the multiple screws 4.

[0025] In a specific embodiment, the screw 4 is provided with threads at both ends, and the upper flange 3 and the lower flange 5 are provided with multiple holes. The threaded end of the screw 4 passes through the holes on the upper flange 3 and the lower flange 5 and is fixedly connected with the nut 2. An accommodating space is formed inside the multiple screws 4 between the upper flange 3 and the lower flange 5, and the accommodating space is used to accommodate the frozen soil layer 10.

[0026] Furthermore, the bottom of the upper flange 3 and the top of the lower flange 5 are provided with grooves, the upper flange 3 and the lower flange 5 are attached to the upper and lower sides of the frozen soil layer 10, and a gas chamber 12 is formed between the grooves and the frozen soil layer 10.

[0027] In a specific embodiment, grooves are formed at the bottom of the upper flange 3 and the top of the lower flange 5, and a gas chamber 12 is formed between the grooves and the frozen soil layer 10. Gas is introduced into the gas chamber 12 through the air inlet pipe 1 to detect the frozen soil layer 10.

[0028] Furthermore, the cooling component includes a heat exchange coil 13 disposed outside the frozen soil layer 10 or a retaining sleeve 6 disposed outside the housing component, the retaining sleeve 6 being filled with a cryogenic liquid.

[0029] In a specific implementation, the cooling component cools the frozen soil layer 10 in the containment space, and the cooled frozen soil layer 10 forms a sealing structure with the sealing ring 11 to prevent leakage of the frozen soil layer 10 during testing. The cooling component can be configured with a retaining sleeve 6 on the outside of the entire containment component, or the heat exchange coil 13 can be configured to surround the outside of the frozen soil layer 10. The retaining sleeve 6 can cover the entire surface of the object at the same time, making the temperature distribution more uniform.

[0030] Furthermore, the cooling assembly also includes an inlet pipe 7 disposed at one end of the heat exchange coil 13 and an outlet pipe 9 disposed at the other end of the heat exchange coil 13, or includes an inlet pipe 7 disposed on one side of the retaining sleeve 6 and an inlet pipe 7 disposed on the other side of the retaining sleeve 6.

[0031] In a specific embodiment, the inlet pipe 7 is used to introduce low-temperature liquid for cooling, while the outlet pipe 9 is used to discharge low-temperature liquid or gas for cooling. The cooling liquid or gas in the inlet pipe 7 enters the retaining sleeve 6 or the heat exchange coil 13, and then cools the area around the frozen soil layer 10 before being discharged from the outlet pipe 9.

[0032] Of course, there may be other implementations of this utility model. Based on this implementation, other implementations obtained by those skilled in the art without any creative effort are all within the scope of protection of this utility model.

Claims

1. A sealing performance testing device for frozen soil at low temperatures, characterized in that, Includes sealing components and cooling components, wherein: The sealing assembly has an internal receiving space, and the cooling assembly is used to cool the receiving space. The top and bottom of the sealing assembly are connected to an air inlet pipe and an air outlet pipe. A sealing ring is provided at the top and bottom of the receiving space. The receiving space contains a frozen soil layer, and the top and bottom of the frozen soil layer are in contact with the sealing rings. The cooling assembly is used to cool the frozen soil layer and cause the water-containing soil between the sealing ring and the frozen soil layer to freeze and form a crystal seal, forming a gas chamber located between the upper and lower sides of the frozen soil layer and the sealing assembly. The air inlet pipe is used to introduce gas into the gas chamber for testing.

2. The sealing performance testing device for frozen soil at low temperatures according to claim 1, characterized in that, The sealing assembly includes an upper flange, a lower flange, screws, and nuts. The screws are disposed between the upper flange and the lower flange. Both ends of the multiple screws are fixedly connected to the upper flange and the lower flange by the nuts, forming a receiving space located inside the multiple screws.

3. The sealing performance testing device for frozen soil at low temperatures according to claim 2, characterized in that, The bottom of the upper flange and the top of the lower flange are provided with grooves, the upper flange and the lower flange are attached to the upper and lower sides of the frozen soil layer, and a gas chamber is formed between the groove and the frozen soil layer.

4. The sealing performance testing device for frozen soil at low temperatures according to claim 1, characterized in that, The cooling component includes a heat exchange coil disposed on the outside of the permafrost layer or a retaining sleeve disposed on the outside of the receiving component, the retaining sleeve being filled with a cryogenic liquid.

5. The sealing performance testing device for frozen soil at low temperatures according to claim 4, characterized in that, The cooling assembly further includes an inlet pipe disposed at one end of the heat exchange coil and an outlet pipe disposed at the other end of the heat exchange coil, or includes an inlet pipe disposed on one side of the retaining sleeve and an inlet pipe disposed on the other side of the retaining sleeve.

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