Sealing structure for high-purity nitrogen storage

Abstract

The sealing structure comprises a gas storage bottle, a valve seat and a valve are arranged at the position of a bottle mouth of the gas storage bottle, an annular partition plate is arranged in the middle of an inner cavity of the valve seat, and the upper end and the lower end of the annular partition plate are each provided with an empty groove; a bottle mouth of the gas storage bottle and a valve pipe of the valve are installed in the two empty grooves respectively and tightly attached to the end face of the annular partition plate, and a communicating pipe is installed in the middle of the annular partition plate in a threaded mode. According to the sealing structure disclosed by the invention, the valve can be mounted on the bottle mouth of the gas storage bottle through the valve seat, and the gap between the valve seat and the bottle mouth of the gas storage bottle is sealed by adopting the piston plug, so that the piston plug is always clung to the lower end surface of the annular partition plate under the pressure action of high-purity nitrogen and is deformed; the sealing element on the valve is prevented from being influenced by the pressure of high-purity nitrogen by blocking the gap between the annular partition plate and the bottle mouth of the gas storage bottle, so that the leakage of the high-purity nitrogen can be effectively prevented, and the sealing effect of the gas storage bottle is ensured.

Description

Technical Field

[0001] This utility model relates to the technical field of high-purity nitrogen storage equipment, specifically to a sealing structure for high-purity nitrogen storage. Background Technology

[0002] High-purity nitrogen is an inert diatomic gas with extremely high purity. It is colorless, tasteless, and odorless, and is widely used in many fields such as semiconductor manufacturing, optical instruments, chemical manufacturing, food industry, and pharmaceutical industry as a protective gas, carrier gas, or reaction gas to improve product quality, extend shelf life, or achieve specific process requirements. High-purity nitrogen is generally stored in high-pressure gas cylinders to prevent nitrogen leakage and ensure the safe storage and effective use of nitrogen.

[0003] However, as the internal storage pressure of gas cylinders increases, the reliability requirements for the sealing structure become extremely high. Existing high-pressure gas cylinders primarily use flanges and metal gaskets or additional sealing rings to seal the nozzle and valve. However, these sealing rings and metal gaskets are susceptible to wear and aging under the high pressure inside the cylinder, leading to seal failure and affecting its sealing performance. Therefore, those skilled in the art have provided a sealing structure for high-purity nitrogen storage to solve the problems mentioned in the background section. Utility Model Content

[0004] The purpose of this invention is to provide a sealing structure for storing high-purity nitrogen, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A sealing structure for storing high-purity nitrogen includes: a gas storage cylinder, a valve seat and a valve at the cylinder nozzle, wherein an annular partition is provided at the middle position of the valve seat cavity, and the upper and lower ends of the annular partition are divided into slots, the cylinder nozzle and the valve tube of the valve are respectively installed inside the two slots and closely attached to the end face of the annular partition, and a connecting pipe is threadedly installed at the middle position of the annular partition, the two ends of the connecting pipe extending into the cylinder nozzle and the valve tube of the valve and communicating with them, and a piston plug is provided at the end of the connecting pipe inside the cylinder nozzle, the piston plug fitting against the inner wall of the cylinder nozzle and closely attached to the lower end face of the annular partition.

[0007] Preferably, sealing gaskets are laid at both the upper and lower ends of the annular partition, and the nozzle of the gas storage cylinder and the valve pipe of the valve are tightly attached to the end face of the annular partition through the sealing gaskets.

[0008] Preferably, the inner walls of both empty slots are provided with threaded grooves, and the nozzle of the gas storage cylinder and the valve pipe of the valve are respectively installed inside the two empty slots through the threaded grooves.

[0009] Preferably, a threaded hole is provided at the middle position of the annular partition, and the connecting pipe is threaded into the interior of the annular partition through the threaded hole and extends to its upper and lower ends.

[0010] Preferably, a through hole is provided at the middle position of the piston plug, and the piston plug is fitted onto the outer wall of the connecting pipe through the through hole. The outer wall of the connecting pipe located below the piston plug is provided with an end plate for limiting its position, and the diameter of the end plate is larger than the inner diameter of the through hole.

[0011] Preferably, a limiting nut is provided at one end of the outer wall of the connecting pipe above the annular partition. The limiting nut is threaded onto the outer wall of the connecting pipe and closely attached to the upper end face of the annular partition, and the internal thread of the limiting nut is opposite in direction to the internal thread of the threaded hole.

[0012] Preferably, a groove is provided on the lower end face of the valve tube at the position corresponding to the limit nut, and the valve tube is engaged above the limit nut and closely attached to the upper end face of the annular partition through the groove.

[0013] Compared with the prior art, the advantages of this utility model are:

[0014] By installing a valve seat on the nozzle of the gas cylinder, the valve can be installed on the nozzle, preventing the valve's seals from being affected by the pressure of high-purity nitrogen. This avoids wear and aging of the valve seals due to the pressure of high-purity nitrogen, ensuring the valve's usability. Furthermore, using a piston plug to seal the gap between the valve seat and the gas cylinder nozzle allows the piston plug to remain tightly against the lower end face of the annular partition and deform under the pressure of high-purity nitrogen, sealing the gap between the annular partition and the gas cylinder nozzle. This effectively prevents the leakage of high-purity nitrogen and ensures the sealing effect of the gas cylinder. Attached Figure Description

[0015] Figure 1 This is a perspective view of a gas storage cylinder according to an embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of the connection structure between the valve, valve seat, and gas cylinder nozzle according to an embodiment of the present invention;

[0017] Figure 3 This is a perspective view of a valve seat according to an embodiment of the present invention;

[0018] Figure 4 This is a split view of a valve seat according to an embodiment of the present invention.

[0019] In the diagram: 1. Gas cylinder; 2. Valve seat; 201. Empty groove; 202. Threaded groove; 21. Annular partition; 211. Threaded hole; 22. Connecting pipe; 221. End plate; 23. Piston plug; 231. Through hole; 24. Limit nut; 3. Valve; 301. Groove. Detailed Implementation

[0020] In the description of this utility model, it should be understood that the terms "center," "lateral," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. Additionally, the term "comprising" and any variations thereof are intended to cover non-exclusive inclusion.

[0021] Combination Figures 1-4 As shown, a valve seat 2 and a valve 3 are provided at the nozzle of the gas cylinder 1. An annular partition 21 is provided in the middle of the inner cavity of the valve seat 2. The upper and lower ends of the annular partition 21 are divided into slots 201. The nozzle of the gas cylinder 1 and the valve tube of the valve 3 are respectively installed inside the two slots 201 and are tightly attached to the end face of the annular partition 21. Furthermore, a connecting pipe 22 is threadedly installed in the middle of the annular partition 21. The two ends of the connecting pipe 22 extend into the interior of the nozzle of the gas cylinder 1 and the valve tube of the valve 3 and are connected to them. A piston plug 23 is provided at the end of the outer wall of the connecting pipe 22 that is inside the nozzle of the gas cylinder 1. The piston plug 23 is attached to the inner wall of the nozzle of the gas cylinder 1 and is tightly attached to the lower end face of the annular partition 21.

[0022] In one embodiment, when installing the valve seat 2, the valve seat 2 can be threaded onto the outer wall of the nozzle of the gas cylinder 1 through the threaded groove 202 on the inner wall of the lower slot 201. The annular partition 21 inside the valve seat 2 is tightly attached to the upper end face of the nozzle of the gas cylinder 1. The sealing gasket on the lower end face of the annular partition 21 seals the gap between the annular partition 21 and the nozzle of the gas cylinder 1. At the same time, the piston plug 23 installed below the annular partition 21 through the connecting pipe 22 is inserted into the nozzle of the gas cylinder 1. The piston plug 23 seals the gap between the inner wall of the nozzle of the gas cylinder 1 and the sealing gasket on the lower end face of the annular partition 21. The installation of the valve seat 2 is thus completed, which can provide a double seal between the valve seat 2 and the nozzle of the gas cylinder 1, improving the sealing effect between the valve seat 2 and the nozzle of the gas cylinder 1.

[0023] In one embodiment, when the piston plug 23 is installed on the valve seat 2, the piston plug 23 can first be fitted onto the outside of the connecting pipe 22 through the through hole 231, and then the connecting pipe 22 can be installed inside the annular partition 21 through the threaded hole 211, so that the end plate 221 at the lower end of the connecting pipe 22 presses the piston plug 23 against the lower end face of the annular partition 21. Then, the limiting nut 24 is installed at the upper end of the connecting pipe 22, so that the limiting nut 24 is tightly attached to the upper end face of the annular partition 21. Tighten the connecting pipe 22 to complete the installation of the piston plug 23. The structure is simple, the disassembly is convenient, and the subsequent maintenance work is convenient.

[0024] In one embodiment, when the piston plug 23 is used to seal between the valve seat 2 and the nozzle of the gas storage bottle 1, the piston plug 23 can always be tightly attached to the lower end face of the annular partition 21 and deform under the pressure of the high-purity nitrogen inside the gas storage bottle 1, sealing the gap between the annular partition 21 and the nozzle of the gas storage bottle 1, preventing the valve seat 2 from having a gap with the nozzle of the gas storage bottle 1, effectively preventing the leakage of high-purity nitrogen, and ensuring the sealing effect of the gas storage bottle 1.

[0025] In one embodiment, when installing valve 3, the valve tube on valve 3 can be installed into valve seat 2 through the threaded groove 202 on the inner wall of the slot 201 above the annular partition 21. The valve tube of valve 3 is then fitted over the connecting pipe 22 and tightly against the sealing gasket on the upper end face of the annular partition 21. The sealing gasket seals the gap between the valve tube, the connecting pipe 22, and the annular partition 21, thus completing the installation of valve 3. Valve 3 can then be installed on the nozzle of gas cylinder 1 via valve seat 2, preventing the seals on valve 3 from being exposed to high-purity nitrogen. The pressure of the gas prevents the seals on valve 3 from being worn or aged due to the pressure of high-purity nitrogen, thus avoiding leakage. This ensures the usability of valve 3. Furthermore, since the valve tube is engaged with the limit nut 24 above the groove 301, the limit nut 24 will not interfere with the installation of the valve tube. This prevents gaps between the valve tube and the annular partition 21 caused by the limit nut 24 interfering with the installation of the valve tube, thus ensuring the sealing performance of valve 3.

[0026] The working principle of this utility model is as follows: When the valve 3 is installed on the gas cylinder 1 for use, the valve seat 2 can be threaded onto the outer wall of the gas cylinder 1's nozzle through the threaded groove 202 on the inner wall of the lower slot 201. The annular partition 21 inside the valve seat 2 is tightly pressed against the upper end face of the gas cylinder 1's nozzle. The sealing gasket on the lower end face of the annular partition 21 seals the gap between the annular partition 21 and the gas cylinder 1's nozzle. Simultaneously, the piston plug 23, installed below the annular partition 21 via the connecting pipe 22, is inserted into the gas cylinder 1's nozzle. The piston plug 23 seals the gap between the inner wall of the gas cylinder 1's nozzle and the sealing gasket on the lower end face of the annular partition 21, thus completing the installation of the valve seat 2. Finally, the valve tube on the valve 3 is installed into the valve cylinder through the threaded groove 202 on the inner wall of the upper slot 201. In seat 2, the valve tube of valve 3 is fitted onto the outside of the connecting pipe 22 and tightly against the sealing gasket on the upper end face of the annular partition 21. The sealing gasket seals the gap between the valve tube, the connecting pipe 22, and the annular partition 21, thus completing the installation of valve 3. Valve 3 can be installed on the nozzle of gas cylinder 1 through valve seat 2. Under the pressure of high-purity nitrogen inside gas cylinder 1, piston plug 23 is always tightly against the lower end face of annular partition 21 and deforms, sealing the gap between annular partition 21 and the nozzle of gas cylinder 1. This prevents the seals on valve 3 from being affected by the pressure of high-purity nitrogen, avoiding wear and aging of the seals on valve 3 caused by the pressure of high-purity nitrogen, which could lead to leakage of valve 3. This effectively prevents the leakage of high-purity nitrogen and ensures the sealing effect of gas cylinder 1.

[0027] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A sealing structure for storing high-purity nitrogen, comprising: A gas storage cylinder (1) is characterized in that a valve seat (2) and a valve (3) are provided at the nozzle of the gas storage cylinder (1), wherein an annular partition (21) is provided at the middle position of the inner cavity of the valve seat (2), and the upper and lower ends of the annular partition (21) are divided by empty slots (201). The nozzle of the gas storage cylinder (1) and the valve tube of the valve (3) are respectively installed inside the two empty slots (201) and closely attached to the end face of the annular partition (21). A connecting pipe (22) is threadedly installed at the middle position of the partition (21). The two ends of the connecting pipe (22) extend to the nozzle of the gas storage cylinder (1) and the valve pipe of the valve (3) and are connected to them respectively. A piston plug (23) is provided at one end of the outer wall of the connecting pipe (22) inside the nozzle of the gas storage cylinder (1). The piston plug (23) fits against the inner wall of the nozzle of the gas storage cylinder (1) and is tightly attached to the lower end face of the annular partition (21).

2. The sealing structure for high-purity nitrogen storage according to claim 1, characterized in that, Sealing gaskets are laid at both the upper and lower ends of the annular partition (21), and the nozzle of the gas storage bottle (1) and the valve tube of the valve (3) are tightly attached to the end face of the annular partition (21) through the sealing gaskets.

3. The sealing structure for storing high-purity nitrogen according to claim 1, characterized in that, The inner walls of the two empty slots (201) are provided with threaded grooves (202), and the nozzle of the gas storage bottle (1) and the valve pipe of the valve (3) are respectively installed inside the two empty slots (201) through the threaded grooves (202).

4. The sealing structure for storing high-purity nitrogen according to claim 1, characterized in that, A threaded hole (211) is provided at the middle position of the annular partition (21), and the connecting pipe (22) is threadedly installed inside the annular partition (21) through the threaded hole (211) and extends to its upper and lower ends.

5. The sealing structure for storing high-purity nitrogen according to claim 1, characterized in that, The piston plug (23) has a through hole (231) at the middle position. The piston plug (23) is fitted onto the outer wall of the connecting pipe (22) through the through hole (231). The outer wall of the connecting pipe (22) is provided with an end plate (221) for limiting its position at one end below the piston plug (23). The diameter of the end plate (221) is larger than the inner diameter of the through hole (231).

6. A sealing structure for storing high-purity nitrogen according to claim 4, characterized in that, A limiting nut (24) is provided at one end of the outer wall of the connecting pipe (22) above the annular partition (21). The limiting nut (24) is threaded onto the outer wall of the connecting pipe (22) and closely attached to the upper end face of the annular partition (21). The internal thread of the limiting nut (24) is opposite to the internal thread of the threaded hole (211).

7. A sealing structure for storing high-purity nitrogen according to claim 6, characterized in that, The valve tube of the valve (3) has a groove (301) at the position corresponding to the limiting nut (24) on the lower end face. The valve tube of the valve (3) is engaged above the limiting nut (24) and closely attached to the upper end face of the annular partition (21) through the groove (301).

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