Underground chamber with breathing gas storage film

Abstract

The utility model provides an underground chamber with a breathing gas storage membrane, which comprises an embedded part and a gas storage membrane, the embedded part comprises a main body and a cover body, a cavity with an opening at the upper end is formed in the main body, a working cavity is formed in the main body, and the cover body is arranged at the opening end at the upper end of the main body; the main body is of a circular-truncated-cone-shaped structure with a small upper end and a large lower end, and the cover body is of an inverted circular-truncated-cone-shaped structure with a large upper end and a small lower end; the gas storage film is arranged in the working cavity, a cavity is formed in the gas storage film, a gas storage cavity is formed in the gas storage film, and a compression cavity is formed between the inner wall of the working cavity and the outer wall of the gas storage film; the first pipe body assembly is communicated with the gas storage cavity; and the second pipe body assembly is communicated with the compression cavity. The underground chamber with the breathing gas storage film is compact in structure, low in construction difficulty, good in sealing performance, capable of achieving stable output of medium gas, small in occupied area, low in manufacturing cost, good in using effect and wide in application range.

Description

Technical Field

[0001] The utility model relates to a gas storage device, in particular to an underground chamber with a breathing gas storage membrane. Background Art

[0002] Carbon dioxide energy storage (CES) technology is a new type of physical energy storage technology based on compressed air energy storage (CAES) and Brayton power generation cycle. The energy storage duration can exceed 16 hours, and the energy release power can reach GW level. It has the advantages of large energy storage density, long operation life, and compact system equipment. It is suitable for large-scale long-term energy storage and has good development and application prospects. In the application of existing technologies, during the low electricity price period, normal-pressure gaseous carbon dioxide is converted into high-pressure liquid carbon dioxide through multi-stage compressors, and electrical energy is stored in the form of the internal energy of carbon dioxide; during the high electricity consumption period, high-pressure liquid carbon dioxide is expanded into normal-pressure gaseous carbon dioxide through multi-stage expanders for power generation, ultimately realizing the storage and release of electrical energy. In current technologies, there are mainly the following three storage methods at the gas storage end of compressed air energy storage and carbon dioxide energy storage: 1. Underground cave gas storage: Utilize natural caves underground, such as salt caverns, depleted oil and gas wells, or newly built gas storage wells, etc., as places to store high-pressure carbon dioxide. However, suitable natural caves are not available everywhere, and there are certain limitations in site selection; the influence of alternating stress on the cave wall during gas charging and discharging may cause collapse over time. 2. Artificial chamber gas storage: It is composed of a concrete lining and a sealing layer in cooperation with surrounding rocks. However, this scheme is only applicable to areas with many hard rock types and extensive underlying distributions, and the site selection of facilities is relatively demanding; moreover, the supporting facilities for carbon dioxide energy storage must be built near the artificial chamber. Therefore, when selecting the site of the artificial chamber, it is necessary to consider that there is sufficient flat ground for building a factory nearby or the conditions for land leveling, which increases the difficulty of site selection of the artificial chamber to a certain extent. 3. High-pressure metal tank gas storage: Build large high-pressure metal containers and store high-pressure carbon dioxide by introducing it into them. This scheme has no requirements for the construction location and only requires a site to be provided. However, the construction cost of high-pressure containers is too high, and metal containers with a thickness of usually 50 - 80 mm are required. Content of the Utility Model

[0003] Technical Problems to be Solved

[0004] The technical problem to be solved by the utility model is to provide an underground chamber with a breathing gas storage membrane that is based on mechanics, has high structural strength, good sealing performance, and can stably output gas pressure.

[0005] Technical Solutions for Solving the Problems

[0006] The utility model provides an underground chamber with a breathing gas storage membrane, which includes:

[0007] The embedded part is buried underground and includes a main body 1 and a cover 3. A chamber with an open upper end is formed in the main body 1 to form a working chamber, and the cover 3 is arranged at the open upper end of the main body 1 to make the working chamber form a sealed chamber.

[0008] The gas storage film 2 is arranged in the working chamber. A chamber is provided in the gas storage film 2 to form a gas storage chamber 20, and a compression chamber 10 is formed between the inner wall of the working chamber and the outer wall of the gas storage film 2.

[0009] The first pipe body assembly 5 is communicated with the gas storage chamber 20 and is used for inputting or outputting the medium gas in the gas storage chamber 20.

[0010] The second pipe body assembly 6 is communicated with the compression chamber 10 and is used for inputting or outputting the air in the compression chamber 10 and making the gas storage chamber 20 form compression or expansion.

[0011] Further, the main body 1 is in a frustum shape with a smaller upper end and a larger lower end.

[0012] Further, the open upper end of the main body 1 extends upward to form a neck 13. The top surface of the neck 13 serves as a lower support surface 13a for supporting the cover 3, and a sealing ring is provided between the contact surface of the lower support surface 13a and the cover 3.

[0013] Further, the lower end of the second pipe body assembly 6 is located inside the neck.

[0014] Further, the cover 3 realizes sealing through its own gravity and the soil pressure on its upper end and can withstand high pressure.

[0015] Further, the included angle α between the side wall 12 and the bottom surface 11 of the main body 1 is greater than or equal to 50° and less than or equal to 65°.

[0016] Further, the included angle α between the side wall 12 and the bottom surface 11 of the main body 1 is greater than or equal to 57° and less than or equal to 58°.

[0017] Further, the ratio of the diameter of the neck of the main body 1 to the diameter of its bottom surface is greater than or equal to 1 / 5 and less than 1 / 3.

[0018] Further, a fillet is provided between the side wall and the bottom surface of the main body 1.

[0019] Further, the cover 3 is in an inverted frustum structure with a larger upper end and a smaller lower end.

[0020] Further, the cover body 3 includes a parallel lower bottom surface 3a and an upper bottom surface 3b, and the area of the upper bottom surface 3b is larger than that of the lower bottom surface 3a. The lower bottom surface 3a serves as a sealing surface for fitting the open end face of the main body 1 to seal the working cavity, and the upper bottom surface 3b serves as a supporting surface for piling soil or rock to generate a downward pressure on the cover body 3.

[0021] Further, the upper bottom surface 3b and the lower bottom surface 3a are circular surfaces arranged coaxially and are connected by an inclined surface 3c.

[0022] Further, the included angle β between the inclined surface 3c and the upper bottom surface 3b is greater than or equal to 10° and less than or equal to 20°

[0023] Further, the included angle β between the inclined surface 3c and the upper bottom surface 3b is greater than or equal to 16° and less than or equal to 17°

[0024] Further, the diameter ratio of the upper bottom surface 3b to the lower bottom surface 3a is greater than or equal to 3:1 and less than or equal to 5:1.

[0025] Further, both the main body 1 and the cover body 3 are made of reinforced concrete.

[0026] Further, the diameter of the lower bottom surface 3a is the same as the diameter of the neck of the main body 1.

[0027] Further, a manhole passage 7 is provided on the cover body 3. The manhole passage 7 extends upward to the ground for maintenance, and a sealing door is provided on the manhole passage 7.

[0028] Further, the sealing door is arranged at the lower end of the manhole passage 7 and opens inward.

[0029] Further, the lower end of the manhole passage 7 is located inside the neck of the main body.

[0030] Further, the first pipe assembly 5 includes a first inlet pipe 51 for air intake into the air storage cavity and a first outlet pipe 52 for air outlet from the air storage cavity. A first turbine generator 511 is provided on the first inlet pipe 51, a first compressor 521 is provided on the first outlet pipe 52, and a liquid storage tank 53 for storing a medium is provided between the first inlet pipe 51 and the first outlet pipe 52.

[0031] Further, the second pipe assembly 6 includes a second inlet pipe 61 for air intake into the compression cavity and a second outlet pipe 62 for air outlet from the compression cavity. A second compressor 611 is provided on the second inlet pipe 61, and a second turbine generator 621 is provided on the second outlet pipe 62.

[0032] Beneficial effects

[0033] The utility model relates to an underground chamber with a breathable gas storage membrane, which aims to solve the problems existing in existing gas storage and redesigns and optimizes the structure of the underground chamber based on mechanics, so that the chamber is not restricted by regions and environments and can be dug downward on any flat ground. The pressure-bearing principle is used to effectively improve the pressure-bearing capacity, and the artificial chamber is universalized at a lower cost. The cone is used as the main shape of the underground chamber, and the gravity of the underground rock layer itself is effectively used, so that the pressure of the high-pressure gas in the chamber acts on the underground rock layer itself over a large area, thereby reducing the top outlet pressure. The trapezoidal steel-concrete cover body with a larger upper portion and a smaller lower portion is used to effectively increase the weight of the cover body itself and ensure its strength, while reducing the sealing size. A sealing ring is used as one of the sealing methods to reduce the difficulty of sealing. The top of the steel-concrete cover is filled with a large amount of rock layer, which increases the pressure of the underground chamber. Increase weight to achieve low-difficulty and high-quality sealing; built-in breathing gas storage membrane, the gas membrane is mainly used to isolate air and carbon dioxide, and by controlling the air pressure in the chamber to make the gas membrane shrink or expand, finally obtaining a stable carbon dioxide output pressure; the release process of the air in the tank is also connected to the generator, and the internal energy is converted into electrical energy to achieve the purpose of energy conservation and emission reduction; it occupies a small area, and most of the buildings of the gas storage facilities constructed by this plan are underground, and only the positions of the inlet and outlet air pipes and maintenance pipes need to be left on the ground, and the corresponding ground can still be used to accommodate other equipment, reducing the cost of land use; the underground chamber with a breathing gas storage membrane of the utility model has a compact structure, low construction difficulty, good sealing performance, can achieve stable output of medium gas, and occupies a small area, low manufacturing cost, good use effect and wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic structural diagram of an underground chamber with a breathing gas storage membrane according to the present invention;

[0035] Figure 2 This is a schematic structural diagram of the main body of the underground chamber with a breathing gas storage membrane of the utility model;

[0036] Figure 3 This is a structural diagram of the cover of the underground chamber with a breathing gas storage membrane of the utility model;

[0037] Figure 4 This is a pipe connection diagram of the underground chamber with a breathing gas storage membrane of the utility model;

[0038] Figure 5 This is a force analysis diagram of the underground chamber with a breathing air storage membrane of the utility model. DETAILED DESCRIPTION

[0039] The following describes the embodiments of the present utility model in detail with reference to the accompanying drawings.

[0040] See Figures 1 - 5 The utility model provides an underground chamber with a breathing gas storage membrane, which includes embedded parts, a gas storage membrane 2, a first pipe body component 5 and a second pipe body component 6.

[0041] The embedded part is buried underground and is made of reinforced concrete as a underground project. The embedded part includes a main body 1 and a cover 3. A chamber is formed inside the main body 1, and the upper end of the chamber is open (has an opening), forming a working chamber. The cover 3 is arranged (closed) on the upper open end of the main body 1, making the working chamber form a sealed chamber.

[0042] In this application, the main body 1 is a frustum-shaped structure with a smaller upper end and a larger lower end, that is, a structure similar to a cone, and its side wall is an inclined plane. Therefore, the internal working chamber also forms a frustum (cone) structure with a smaller upper end and a larger lower end, which can reduce the pressure at the upper open end, reduce the difficulty of sealing construction, and achieve better and more stable sealing. In this embodiment, the angle α between the side wall 12 and the bottom surface 11 of the main body 1 is greater than or equal to 50° and less than or equal to 65°. Preferably, the angle α is greater than or equal to 57° and less than or equal to 58°. At the same time, the upper open end of the main body 1 extends vertically upward to form a neck 13. The neck 13 is cylindrical, and its internal forms a neck opening, which serves as the open end of the main body (working chamber). The top surface of the neck 13 is a plane, which serves as the lower support surface 13a for supporting the cover 3. At the same time, a sealing ring is provided between the contact surface of the lower support surface 13a and the cover 3. The cover 3 is fitted and installed on the top surface of the neck 13, and the sealing is achieved through the self-weight of the cover 3 and the pressure of the soil or rock on the upper end of the cover 3, and it can withstand the high pressure in the working chamber. Therefore, an annular groove is provided on the top surface of the neck 13, and a sealing ring is provided in the annular groove. The thickness of the sealing ring is greater than the depth of the annular groove, and its upper end protrudes outside the annular groove. When the cover is closed, it is compressed and deformed and fits the lower surface of the cover 3 to form a seal. In order to further improve the sealing reliability, the above annular groove can be multiple and coaxially arranged, that is, multiple coaxial sealing rings are provided to achieve a multi-channel sealing structure, greatly improving the sealing reliability. In this application, the bottom surface of the main body 1 is a plane, and the ratio of the diameter of the neck of the main body 1 to the diameter of the bottom surface of the main body 1 is greater than or equal to 1 / 5 and less than 1 / 3, preferably 1 / 4, that is, the diameter of the bottom surface of the main body 1 is 4 times the diameter of the neck 13. At this ratio, combined with the slope of the side wall of the main body 1, it can reduce the construction difficulty, improve the overall structural strength and pressure-bearing capacity. At the same time, within the pressure-bearing capacity range, the aperture is minimized to facilitate the sealing of the cover 3, reduce the pressure at the upper open end of the main body during work, and thus greatly reduce the sealing construction difficulty and improve the sealing reliability and stability. In order to facilitate construction and improve the structural strength at the same time, a fillet is provided between the side wall and the bottom surface of the main body 1, that is, it is connected by an arc transition to avoid generating acute angles and improve the compressive strength.

[0043] Meanwhile, the cover body 3 is an inverted frustum structure with a larger upper end and a smaller lower end. Specifically, the cover body 3 has parallel lower bottom surface 3a and upper bottom surface 3b, and the area of the upper bottom surface 3b is larger than that of the lower bottom surface 3a. The lower bottom surface 3a serves as a sealing surface for fitting the end face of the open end (neck) of the main body 1 to achieve the sealing of the working chamber. The upper bottom surface 3b serves as a supporting surface for piling soil or rock. The soil or rock exerts a downward pressure on the cover body 3, and together with the self-weight of the cover body 3, the lower bottom surface 3a of the cover body 3 is pressed tightly against the top surface of the upper open end (neck) of the main body 1 to achieve sealing. In this embodiment, the upper bottom surface 3b and the lower bottom surface 3a are coaxial circular surfaces, and the diameter of the upper bottom surface 3b is larger than that of the lower bottom surface 3a. The diameter ratio of the two is greater than or equal to 3:1 and less than or equal to 5:1. Preferably, it is 4. At the same time, the upper bottom surface 3b and the lower bottom surface 3a are connected by an inclined surface 3c to form a frustum-shaped structure with a larger upper end and a smaller lower end. To improve the structural strength and increase the weight to a certain extent, the upper bottom surface extends upward for a short distance to form a cylindrical structure, which avoids generating acute angles at the edges of the upper and lower bottom surfaces, improves the structural strength and pressure-bearing capacity, and at the same time increases a certain thickness and its own weight. In this embodiment, the angle β between the inclined surface 3c and the upper bottom surface 3b is greater than or equal to 10° and less than or equal to 20°. Preferably, the angle β is greater than or equal to 16° and less than or equal to 17°. In combination with the diameter ratio of the upper and lower bottom surfaces, while ensuring the structural strength, it can maximize the compression area at the upper end and transmit it to the lower bottom surface to form a pressing surface for the neck, improve the pressing force, improve the pressure-bearing capacity of the working chamber, and at the same time improve the sealing performance. In this application, the diameter of the lower bottom surface 3a is the same as the diameter (outer diameter) of the neck of the main body 1. Therefore, the lower bottom surface 3a can transmit all the pressures of the cover body 3 and the upper part of the cover body 3 to the neck to achieve pressing and sealing, and at the same time bear the pressure inside the working chamber to maximize the utilization of the pressure. At the same time, with the above parametric settings, the area of the upper bottom surface of the cover body 3 is equal to or slightly larger than the bottom surface of the main body 1.

[0044] The gas storage film 2 is arranged in the working chamber and can undergo elastic deformation. A chamber is provided inside the gas storage film 2 to form a gas storage chamber 20 for storing the medium gas. At the same time, a compression chamber 10 is formed between the inner wall of the working chamber and the outer wall of the gas storage film 2 for introducing compressed air and controlling the pressure in the gas storage chamber.

[0045] The first pipe body assembly 5 is connected to the gas storage cavity 20 and is used for the input or output of the medium gas in the gas storage cavity 20. Specifically, the first pipe body assembly 5 includes a first inlet pipe 51 and a first outlet pipe 52. The first inlet pipe 51 is used for the inlet of the gas storage cavity, and the first outlet pipe 52 is used for the outlet of the gas storage cavity. One end of each of them is located in the gas storage cavity 20, and the other end passes through the cover body and extends to the ground. At the same time, a first turbine generator 511 is provided on the first inlet pipe 51, and a first compressor 521 is provided on the first outlet pipe 52. Both the first compressor 521 and the first turbine generator 511 are located on the ground. A liquid storage tank 53 is provided between the first inlet pipe 51 and the first outlet pipe 52 for storing the medium. That is, the inlet end of the liquid storage tank 53 is connected to the first outlet pipe 52, and a first compressor is provided on the first outlet pipe 52 to compress the low-pressure medium in the gas storage cavity into a high-pressure medium and store it in the liquid storage tank. The outlet end of the liquid storage tank 53 is connected to the first inlet pipe 51, and a first turbine generator is provided on the first inlet pipe 51. The high-pressure medium output by the liquid storage tank is expanded and generated electricity by the first turbine expansion generator to form a gaseous low-pressure medium, which is transmitted into the gas storage cavity 20 for storage to form a cycle. In this application, the medium is carbon dioxide;

[0046] The second pipe body assembly 6 is connected to the compression cavity 10 and is used for the input or output of the air in the compression cavity 10, so as to cause the gas storage cavity 20 to be compressed or expanded to generate different gas storage pressures. Specifically, the second pipe body assembly 6 includes a second inlet pipe 61 and a second outlet pipe 62. The second inlet pipe 61 is used for the inlet of the compression cavity. Therefore, a second compressor 611 is provided on the second inlet pipe 61 to compress the air in the environment and transport it into the compression cavity. The second outlet pipe 62 is used for the exhaust of the compression cavity, and a second turbine generator 621 is provided on the second outlet pipe 62, which can expand and generate electricity for the discharged compressed gas to improve the energy utilization rate and avoid or reduce losses; in this application, the lower end of the second pipe body assembly 6 is located in the neck to avoid contact with the gas storage film, improve the use stability and extend the service life.

[0047] At the same time, a manhole passage 7 is provided on the cover body 3. The manhole passage 7 extends upward to the ground for maintenance. A sealing door is provided on the manhole passage 7. In this embodiment, the sealing door is arranged at the lower end of the manhole passage 7 and opens inward, which can increase the sealing reliability of the sealing door, that is, the sealing door is pressed against the bottom surface of the cover body by the internal pressure. The greater the pressure, the better the sealing performance. While improving the sealing performance, the use reliability is greatly improved; and the lower end of the manhole passage 7 is also located in the neck of the main body to avoid contact with the gas storage film; the manhole passage is a vertically arranged steel pipe structure with an anti-rust coating on the surface. It can adopt a multi-section structure and is installed in an assembled and spliced form, which is convenient for production, transportation and assembly.

[0048] The following is a simple acceptance analysis of the embedded parts (main body and cover) in this application:

[0049] Refer to Figure 5 , the lower bottom surface 3a of the cover 3 fits with the top surface of the neck of the main body 1. The pressing of the neck of the main body 1 is achieved through the weight of the cover 3 itself. At the same time, the top of the cover 3 is covered with soil or rock, and the gravity of the soil or rock forms a pressure on the cover. This pressure is transmitted to the neck of the main body through the lower bottom surface of the cover; at the same time, since the area of the upper bottom surface 3b of the cover is larger than that of the lower bottom surface 3a, therefore, the contact area with the soil or rock can be increased, that is, the pressure of the upper-end soil and rock on the cover is increased, more soil or rock can be borne, indirectly, the pressure of the lower bottom surface of the cover on the neck of the main body is increased, the overall sealing performance is improved, and at the same time, the pressure-bearing capacity of the working cavity is increased; at the same time, the side wall of the cover is an inclined surface, which can generate a certain inclined pressure on the soil at the lower end of the inclined surface. Since the main body is a frustum structure with a smaller upper end and a larger lower end, this part of the soil is just located outside the side wall of the main body. The force generated by the inclined surface of the cover can be transmitted to the side wall of the main body 1 through the soil or rock, and thus the internal pressure-bearing capacity can be increased; inside the main body 1, the pressure generated in the working cavity (including the gas storage cavity and the compression cavity) will generate an outward thrust on the side wall of the working cavity and the lower bottom surface of the cover. There is an inward pressure outside the main body. Therefore, through this structural setting, the pressure-bearing capacity of the working cavity inside the main body can be greatly improved, which is suitable for different gas storage requirements and has a wide range of applications.

[0050] The following describes the working process of the underground chamber with a breathing gas storage membrane of the present utility model, which includes the following steps:

[0051] S1. Energy storage stage: At low electricity prices at night, the 1.5 Mpa gaseous carbon dioxide in the gas storage cavity is compressed by the first compressor through the first outlet pipe, compressed to 7.5 Mpa and stored in the liquid storage tank; at this time, the carbon dioxide in the gas storage cavity gradually decreases, and the atmospheric normal-pressure air is compressed by the second compressor to form 1.5 Mpa compressed air, which is stored in the compression cavity through the second inlet pipe, thereby maintaining the pressure in the gas storage cavity or the working cavity;

[0052] S2. Energy release stage: At high electricity prices during the day, the 7.5 Mpa liquid carbon dioxide in the liquid storage tank is expanded and generated electricity by the first turbine expander generator. The expanded 1.5 Mpa gaseous carbon dioxide enters the underground gas storage cavity through the first inlet pipe. At this time, the carbon dioxide in the gas storage cavity gradually increases. At the same time, the high-pressure air in the compression cavity is discharged through the second outlet pipe, thereby maintaining the pressure in the gas storage cavity or the working cavity. The discharged compressed air generates electric energy through the second turbine expansion generator and returns to the atmosphere, converting internal energy into electric energy to achieve the purpose of energy conservation and emission reduction.

[0053] In order to maintain a stable pressure input or output, in this embodiment, the pressure of the compressed air filled into the compression chamber is the same as the pressure of the carbon dioxide discharged from the air storage chamber; the pressure of the carbon dioxide filled into the air storage chamber is the same as the pressure of the compressed air discharged from the compression chamber.

[0054] The utility model relates to an underground chamber with a breathable gas storage membrane, which aims to solve the problems existing in existing gas storage and redesigns and optimizes the structure of the underground chamber based on mechanics, so that the chamber is not restricted by regions and environments and can be dug downward on any flat ground. The pressure-bearing principle is used to effectively improve the pressure-bearing capacity, and the artificial chamber is universalized at a lower cost. The cone is used as the main shape of the underground chamber, and the gravity of the underground rock layer itself is effectively used, so that the pressure of the high-pressure gas in the chamber acts on the underground rock layer itself over a large area, thereby reducing the top outlet pressure. The trapezoidal steel-concrete cover body with a larger upper portion and a smaller lower portion is used to effectively increase the weight of the cover body itself and ensure its strength, while reducing the sealing size. A sealing ring is used as one of the sealing methods to reduce the difficulty of sealing. The top of the steel-concrete cover is filled with a large amount of rock layer, which increases the pressure of the underground chamber. Increase weight to achieve low-difficulty and high-quality sealing; built-in breathing gas storage membrane, the gas membrane is mainly used to isolate air and carbon dioxide, and by controlling the air pressure in the chamber to make the gas membrane shrink or expand, finally obtaining a stable carbon dioxide output pressure; the release process of the air in the tank is also connected to the generator, and the internal energy is converted into electrical energy to achieve the purpose of energy conservation and emission reduction; it occupies a small area, and most of the buildings of the gas storage facilities constructed by this plan are underground, and only the positions of the inlet and outlet air pipes and maintenance pipes need to be left on the ground, and the corresponding ground can still be used to accommodate other equipment, reducing the cost of land use; the underground chamber with a breathing gas storage membrane of the utility model has a compact structure, low construction difficulty, good sealing performance, can achieve stable output of medium gas, and occupies a small area, low manufacturing cost, good use effect and wide range of applications.

[0055] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. An underground chamber with a breathing air storage membrane, characterized in that, Comprising: Embedded parts, buried underground, including a main body and a cover body. A chamber with an open upper end is formed inside the main body to form a working chamber, and the cover body is arranged at the open upper end of the main body to make the working chamber form a sealed chamber; the main body is a frustum-shaped structure with a smaller upper end and a larger lower end, and the cover body is an inverted frustum structure with a larger upper end and a smaller lower end; A gas storage membrane, arranged in the working chamber. A chamber is provided inside the gas storage membrane to form a gas storage chamber, and a compression chamber is formed between the inner wall of the working chamber and the outer wall of the gas storage membrane; A first pipe body assembly, communicated with the gas storage chamber, for inputting or outputting the medium gas in the gas storage chamber; A second pipe body assembly, communicated with the compression chamber, for inputting or outputting the air in the compression chamber and making the gas storage chamber form compression or expansion.

2. The underground chamber with a breathing air storage membrane according to claim 1, wherein: The open upper end of the main body extends upward to form a neck, and the top surface of the neck serves as a lower support surface for supporting the cover body. A sealing ring is provided between the contact surface of the lower support surface and the cover body.

3. The underground chamber with a breathing air storage membrane as claimed in claim 1, wherein: The cover body realizes sealing through its own gravity and the soil pressure on its upper end and can withstand high pressure.

4. The underground chamber with a breathing air storage membrane according to claim 1, characterized in that: The included angle α between the side wall and the bottom surface of the main body is greater than or equal to 50° and less than or equal to 65°.

5. The underground chamber with a breathing air storage membrane according to claim 2, wherein: The ratio of the diameter of the neck of the main body to the diameter of its bottom surface is greater than or equal to 1 / 5 and less than 1 / 3.

6. The underground chamber with a breathing air storage membrane as claimed in claim 1, wherein: The cover body includes a parallel lower bottom surface and an upper bottom surface, and the area of the upper bottom surface is larger than that of the lower bottom surface. The lower bottom surface serves as a sealing surface for fitting the end surface of the open end of the main body to realize the sealing of the working chamber, and the upper bottom surface serves as a supporting surface for piling soil or rock and generating a downward pressure on the cover body.

7. The underground chamber with a breathing air storage membrane according to claim 6, characterized in that: The upper bottom surface and the lower bottom surface are circular surfaces arranged coaxially and are connected by an inclined surface.

8. The underground chamber with a breathing air storage membrane according to claim 7, characterized in that: The included angle β between the inclined surface and the upper bottom surface is greater than or equal to 10° and less than or equal to 20°.

9. The underground chamber with a breathing air storage membrane according to claim 6 or 8, characterized in that: The ratio of the diameter of the upper bottom surface to the diameter of the lower bottom surface is greater than or equal to 3:1 and less than or equal to 5:

1.

10. The underground chamber with a breathing air storage membrane according to claim 1, characterized in that: A manhole passage is provided on the cover body. The manhole passage extends upward to the ground for maintenance, and a sealing door is provided on the manhole passage.

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