CN218972398U - Gas cylinder and liner assembly thereof - Google Patents

Abstract

The utility model discloses a gas cylinder and a liner assembly thereof. The inner container is internally provided with an air storage cavity, and a connecting port communicated with the air storage cavity is formed in the inner container. The valve seat is provided with a valve pipe which is connected with the inner container and is communicated with the gas storage cavity through the connecting port. The inside of the connecting sleeve piece is hollow, and the connecting sleeve piece is fixedly sleeved on the outer side or the inner side of the valve pipe and is fixedly connected with the inner container. The gas cylinder and the liner assembly thereof have the advantages of good connection stability between the valve seat and the liner, difficult leakage of gas in the liner, good sealing performance and high reliability.

Description

Gas cylinder and liner assembly thereof

Technical Field

The utility model relates to the field of gas cylinders, in particular to a gas cylinder and a liner assembly thereof.

Background

The gas cylinder is mainly used for storing various compressed gases, such as nitrogen, hydrogen, natural gas and the like, and has wide application. The gas cylinder generally comprises a liner, a wear-resistant valve seat connected to one end of the liner, and a cylinder valve connected to the valve seat and communicated with the liner, so that the interior of the liner is inflated or deflated by operating the cylinder valve.

However, in the long-term use process of the gas cylinder, cracks or gaps are easy to appear at the joint of the inner container and the valve seat, so that the valve seat and the inner container are separated, gas in the inner container leaks, sealing failure and inner container collapse are caused, and the use reliability of the inner container is poor.

Disclosure of Invention

The utility model has the advantages that the gas cylinder and the liner assembly thereof are provided, the connection stability of the valve seat and the liner is good, the gas in the liner is not easy to leak, the sealing performance is good, and the reliability is high.

To achieve at least one of the above advantages, one advantage of the present utility model is to provide a gas cylinder liner assembly, comprising: the inner container is internally provided with an air storage cavity, and a connecting port communicated with the air storage cavity is formed in the inner container; the valve seat is provided with a valve pipe which is connected with the inner container and is communicated with the gas storage cavity through the connecting port; and the connecting sleeve piece is hollow, fixedly sleeved on the outer side or the inner side of the valve pipe and fixedly connected with the inner container.

According to one embodiment of the utility model, the valve seat is provided with an extension part which extends outwards along the radial direction of the valve tube and is connected with the outer wall of the inner container, one of two surfaces of the outer wall of the inner container and the extension part, which are close to each other, is provided with at least one rotation stopping groove, and the other surface is provided with at least one rotation stopping part which can be matched and arranged in the rotation stopping groove.

According to an embodiment of the present utility model, the inner container includes two end cylinders and a middle cylinder, the middle cylinder is located between the two end cylinders and is respectively communicated with the two end cylinders to form the gas storage cavity, one of the end cylinders and the middle cylinder forms an annular gap extending along an axial direction, and the other one is inserted into the annular gap along the axial direction and then is correspondingly welded and connected with the end cylinder or the middle cylinder.

According to one embodiment of the utility model, the inner container is provided with an inner extension pipe, the inner extension pipe extends from the connecting port to a direction close to the air storage cavity, the connecting sleeve comprises an inner sleeve part, an outer sleeve part and an annular bottom wall formed between the outer sleeve part and the inner sleeve part, an annular gap is formed by surrounding the annular bottom wall, the inner wall of the outer sleeve part and the outer wall of the inner sleeve part, and the valve pipe is sleeved in the inner extension pipe and is spliced in the annular gap together with the inner extension pipe.

According to an embodiment of the utility model, at least two sealing elements are included, at least one of which is arranged between the inner wall of the outer jacket portion and the inner extension tube, at least one of which is arranged between the inner extension tube and the annular bottom wall.

According to one embodiment of the utility model, a connecting thread is formed in the valve tube, an external thread is formed on the outer wall of the inner sleeve part and used for being in threaded connection with the connecting thread, an internal thread is formed on the inner wall of the inner sleeve part and used for being in threaded connection with the bottle valve, and the rotation directions of the internal thread and the external thread are opposite.

According to an embodiment of the present utility model, the connection sleeve includes a connection pipe and an overhanging portion, the overhanging portion extends radially outwards from an outer wall of the connection pipe and is integrally formed with the liner, and the valve pipe passes through the connection port to be connected in the connection pipe in a sealing manner.

According to an embodiment of the present utility model, the inner container has an extension tube, the extension tube extends from the connection port to a direction away from the air storage cavity, the extension tube is sleeved in the valve tube, the connection sleeve is in a sleeve shape, the connection sleeve is sleeved in the valve tube and integrally formed with the extension tube, and the air bottle inner container assembly includes at least one sealing member, and the sealing member is configured to be disposed between a bottle valve and the valve tube, or between the bottle valve and the connection sleeve.

According to an embodiment of the present utility model, the valve seat is made of metal, and the inner container is made of plastic.

The utility model also provides a gas cylinder, which comprises a cylinder valve and the gas cylinder liner assembly, wherein the cylinder valve is sleeved in the valve seat or the connecting sleeve and is communicated with the gas storage cavity.

Drawings

Fig. 1 shows a cross-sectional view of a cylinder liner assembly according to a first embodiment of the present utility model.

Fig. 2 shows a cross-sectional view of the valve seat, the connection kit and the liner end portion of the first embodiment of the present utility model after connection.

Fig. 3 shows a cross-sectional view of a cylinder liner assembly according to a second embodiment of the present utility model.

Fig. 4 shows a cross-sectional view of a valve seat, a connection sleeve and an end portion of a liner of a second embodiment of the present utility model after connection.

Fig. 5 shows a cross-sectional view of a cylinder liner assembly according to a third embodiment of the present utility model.

Fig. 6 shows a cross-sectional view of a valve seat, a connection sleeve and an end portion of a liner of a third embodiment of the present utility model after connection.

Fig. 7 shows an enlarged schematic view of the portion a in fig. 2, 4 and 6.

Fig. 8 shows an enlarged schematic view of the portion B in fig. 4.

Fig. 9 shows an enlarged schematic view of the portion C in fig. 6.

Reference numerals

10. An inner container; 101. a gas storage chamber; 12. an end cylinder; 1201. a connection port; 1202. a notch; 12021. a notch surface; 123. a rotation stopping groove; 13. a middle cylinder; 14. an inner extension tube 15, an extension tube 16 and a conical groove;

20. a valve seat; 21. a valve tube; 22. an extension part; 221. a rotation stopping part;

30. a connection kit; 31. an inner sleeve portion, 32, an outer sleeve portion; 33. an annular bottom wall; 34. a connecting pipe; 35. an overhanging portion; 36. a conical protrusion;

40. and a seal.

Detailed Description

The following description is presented to enable one of ordinary skill in the art to make and use the utility model. The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art. The basic principles of the utility model defined in the following description may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the utility model.

It will be appreciated by those skilled in the art that in the present disclosure, the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc. refer to an orientation or positional relationship based on that shown in the drawings, which is merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore the above terms should not be construed as limiting the present utility model.

It will be understood that the terms "a" and "an" should be interpreted as referring to "at least one" or "one or more," i.e., in one embodiment, the number of elements may be one, while in another embodiment, the number of elements may be plural, and the term "a" should not be interpreted as limiting the number.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may communicate with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Referring to fig. 1 to 6, a cylinder liner assembly according to a preferred embodiment of the present utility model will be described in detail below, wherein the cylinder liner assembly includes a liner 10, a valve seat 20, and a connection sleeve 30.

Specifically, an air storage cavity 101 is formed in the liner 10, and a connection port 1201 communicating with the air storage cavity 101 is formed in the liner 10.

The valve seat 20 has a valve tube 21, and the valve tube 21 is connected to the inner container 10 and communicates with the gas storage chamber 101 through the connection port 1201.

The connecting sleeve 30 is hollow, as shown in fig. 2 or fig. 6, the connecting sleeve 30 is fixedly sleeved on the inner side of the valve tube 21 and fixedly connected with the liner 10, or as shown in fig. 4, the connecting sleeve 30 is fixedly sleeved on the outer side of the valve tube 21 and fixedly connected with the liner 10.

In this way, the valve seat 20 and the liner 10 are stably connected and not easily separated, and the gas stored in the liner 10 cannot leak due to the separation of the valve seat 20 and the liner 10, so that the sealing performance and the use reliability of the gas cylinder liner 10 are improved.

Further, the liner 10 may be a plastic liner, and the plastic liner is made of PE, PA, PPS, EVOH, or other nonmetallic materials with good gas compatibility with high-pressure gas, such as hydrogen. The plastic liner material can be single-layer or multi-layer thermoplastic material, and the thickness of the plastic liner is preferably 3mm-8mm. When a plurality of layers of thermoplastic materials are used, the liner 10 at least comprises a gas barrier layer, which achieves a high barrier function to gas. The valve seat 20 may be a metal valve seat, preferably made of 6061 aluminum alloy or 316 stainless steel or 316L stainless steel or other metal materials with good compatibility with high pressure gases such as hydrogen.

It will be appreciated that the metal valve seat 20 has the advantages of good wear resistance, high strength, etc., while the plastic liner 10 has the advantages of low cost and light weight, etc. Therefore, the air bladder set formed by combining the metal valve seat 20 and the plastic inner bladder 10 has excellent market application value and wider application range. However, the difference between the thermal expansion and cold contraction properties of the metal material and the plastic material is large. Therefore, the joint between the metal valve seat 20 and the plastic liner 10 is easily cracked due to expansion and contraction, and the liner is more easily sealed and failed and collapsed. The connection sleeve 30 of the present application can be fixedly connected with the metal valve seat 20 and the plastic liner 10, respectively. Thus, the improvement of the sealing performance of the air bladder assembly having the metal valve seat 20 and the plastic liner 10 is more remarkable. Therefore, the air bladder assembly having the metal valve seat 20 and the plastic inner bladder 10 has high applicability, is not easily damaged, and has high use reliability.

According to some preferred embodiments of the present utility model, referring to fig. 1 and 2, the liner 10 includes two end cylinders 12 and an intermediate cylinder 13, and the intermediate cylinder 13 is located between the two end cylinders 12 and is respectively in communication with the two end cylinders 12 to form the gas storage chamber 101, one of the end cylinders 12 and the intermediate cylinder 13 forms an annular gap 1202 extending along an axial direction, and the other is inserted into the annular gap 1202 along an axial direction and then is welded to the end cylinder 12 or the intermediate cylinder 13.

Specifically, the end cylinder 12 forms an annular notch 1202, and the intermediate cylinder 13 is inserted into the annular notch 1202 axially and then welded to the end cylinder 12.

Alternatively, the middle cylinder 13 forms an annular notch 1202, and the end cylinder 12 is inserted into the annular notch 1202 axially and then welded to the middle cylinder 13. The whole inner container 10 formed by welding has good connection stability and good sealing performance.

In addition, the intermediate cylinder 13 may be sleeved outside the end cylinder 12, and in this case, as shown in fig. 1, a notch surface 12021 of the annular notch 1202 may be formed on an outer wall surface of the end cylinder 12, and a notch surface 12021 of the annular notch 1202 may be formed on an inner wall surface of the intermediate cylinder 13.

The intermediate cylinder 13 may be fitted inside the end cylinder 12, and in this case, the notch surface 12021 of the annular notch 1202 may be formed on the inner wall surface of the end cylinder 12 or on the outer wall surface of the intermediate cylinder 13.

Specifically, the two parts are in interference fit, the radial contact surfaces of the two parts are tightly attached, the flatness tolerance of the two radial contact surfaces is 0.01mm-1mm, and the perpendicularity relative to the axis is 0.01mm-1mm, so that the integral sealing performance of the liner 10 formed by welding is further ensured.

In particular, the end cylinder 12 and the intermediate cylinder 13 may be welded using infrared or laser. When laser welding is used, one of the end cylinder 12 and the intermediate cylinder 13 is made of a light-absorbing material, and the other is made of a light-transmitting material. When infrared welding is used, the end cylinder 12 and the intermediate cylinder 13 have no transparency requirement.

According to some preferred embodiments of the present utility model, referring to fig. 2 and 7, the valve seat 20 has an extension 22, and the extension 22 extends radially outwardly along the valve tube 21 and is connected to the outer wall of the inner container 10. At least one rotation stopping groove 123 is formed on one of the two surfaces of the outer wall of the liner 10 and the outer extension 22, which are close to each other, and at least one rotation stopping portion 221 is formed on the other surface, which is capable of being cooperatively disposed in the rotation stopping groove 123. In this way, the valve seat 20 and the liner 10 are not easy to rotate relatively, so that the connection stability between the valve seat 20 and the liner 10 is further improved, and the sealing performance of the gas cylinder liner assembly is enhanced.

Specifically, the outer wall of the liner 10 is provided with the rotation stopping groove 123, and the outer extension 22 of the valve seat 20 is provided with the rotation stopping portion 221.

Alternatively, the outer wall of the liner 10 is provided with the rotation stop portion 221, and the outer extension 22 of the valve seat 20 is provided with the rotation stop groove 123.

Further, the number of the rotation stopping portions 221 is plural, the rotation stopping portions 221 are annularly spaced around the axis of the liner 10 or the valve seat 20, the number of the rotation stopping grooves 123 is plural, and the rotation stopping grooves 123 are disposed in one-to-one correspondence with the rotation stopping portions 221, so as to further prevent the relative rotation between the valve seat 20 and the liner 10.

According to some preferred examples of the present utility model, referring to fig. 2, the inner container 10 has an inner extension pipe 14, the inner extension pipe 14 extends from the connection port 1201 to a direction approaching the gas storage chamber 101, the connection kit 30 includes an inner sleeve portion 31, an outer sleeve portion 32, and an annular bottom wall 33 formed between the outer sleeve portion 32 and the inner sleeve portion 31, the annular bottom wall 33, an inner wall of the outer sleeve portion 32, and an outer wall of the inner sleeve portion 31 are surrounded to form an annular gap, and the valve pipe 21 is sleeved in the inner extension pipe 14 and is inserted in the annular gap together with the inner extension pipe 14. In this way, the connection sleeve 30, the liner 10 and the valve tube 21 have good connection stability, thereby further improving the sealing performance and the use reliability of the whole gas cylinder liner assembly.

Further, a connecting thread is formed in the valve tube 21, an external thread is formed on the outer wall of the inner sleeve portion 31 for screwing the connecting thread, an internal thread is formed on the inner wall of the inner sleeve portion 31 for screwing the bottle valve, and the directions of the internal thread and the external thread are opposite. In this way, the connection sleeve 30 is difficult to rotate when the bottle valve is rotated, thereby ensuring that the connection sleeve 30 does not come loose.

Further, the female screw and the male screw are not equal in pitch, thereby functioning to further prevent the connection sleeve 30 from being loosened.

Specifically, the connection sleeve 30 may be made of metal.

Specifically, referring to FIG. 2, the cylinder liner assembly includes at least two seals 40, at least one seal 40 being disposed between the inner wall of the outer sleeve portion 32 and the inner extension tube 14, at least one seal 40 being disposed between the inner extension tube 14 and the annular bottom wall 33. The double sealing element 40 is adopted, so that the sealing effect is improved, and the high-pressure gas is reliably sealed. Specifically, the sealing member 40 is a sealing ring. The sealing ring is preferably made of silicon rubber, fluorosilicone rubber, fluorocarbon rubber, ethylene propylene diene monomer rubber, hydrogenated butadiene acrylonitrile or other rubber materials with good compatibility with high-pressure gas.

According to other preferred examples of the present utility model, referring to fig. 4, the connection kit 30 includes a connection pipe 34 and an overhanging portion 35, the overhanging portion 35 extends radially outwards from the outer wall of the connection pipe 34 and is integrally formed with the liner 10, and the valve pipe 21 is sealingly connected in the connection pipe 34 through the connection port 1201. Therefore, the firm connection between the connecting sleeve 30 and the valve tube 21 of the valve seat 20 and the inner container 10 is realized, and the tightness is strong, so that the overall connection stability, tightness and reliability of the gas cylinder inner container assembly are further improved.

Preferably, in combination with fig. 4 and 8, the valve tube 21 is sleeved in the connecting tube 34 in an interference fit manner, one of two opposite surfaces of the overhanging portion 35 and the inner container 10, which are close to each other, is provided with a plurality of tapered protrusions 36 arranged at intervals, the other is provided with a plurality of tapered grooves 16 arranged at intervals, and a plurality of tapered protrusions 36 are arranged in a one-to-one correspondence manner in a plurality of tapered grooves 16.

Further, referring to fig. 4, the cylinder liner assembly includes at least one seal 40, the seal 40 being disposed between the connecting tube 34 and the valve tube 21. Specifically, the sealing member 40 is a sealing ring. The sealing ring is preferably made of silicon rubber, fluorosilicone rubber, fluorocarbon rubber, ethylene propylene diene monomer rubber, hydrogenated butadiene acrylonitrile or other rubber materials with good compatibility with high-pressure gas.

In particular, the connection kit 30 may be a plastic piece.

According to other preferred examples of the present utility model, referring to fig. 6, the liner 10 has an extension tube 15, the extension tube 15 extends from the connection port 1201 to a direction away from the gas storage chamber 101, the extension tube 15 is sleeved in the valve tube 21, the connection sleeve 30 is sleeved in the valve tube 21, and the connection sleeve 30 is integrally formed with the extension tube 15. In this way, the connection sleeve 30 is firmly connected with the valve tube 21 of the valve seat 20 and the liner 10, so as to further improve the connection stability and sealing performance of the formed gas cylinder liner assembly.

Further, referring to fig. 6 and 9, the connection sleeve 30 is sleeved in the valve tube 21 in an interference fit manner, one of the connection sleeve 30 and the extension tube 15 is provided with a plurality of tapered protrusions 36 arranged at intervals, the other is provided with a plurality of tapered grooves 16 arranged at intervals, and the tapered protrusions 36 are correspondingly arranged in the tapered grooves 16 one by one, so that the connection firmness and stability of the connection sleeve 30, the liner 10 and the valve seat 20 are further improved.

Further, the material of the connecting sleeve 30 and the material of the inner container 10 are the same, and both are plastic.

Further, referring to fig. 6, the cylinder liner assembly includes at least one seal 40, the seal 40 being adapted to be disposed between a cylinder valve 50 and the valve tube 21, or between the cylinder valve 50 and the connection kit 30. Specifically, the sealing member 40 is a sealing ring. The sealing ring is preferably made of silicon rubber, fluorosilicone rubber, fluorocarbon rubber, ethylene propylene diene monomer rubber, hydrogenated butadiene acrylonitrile or other rubber materials with good compatibility with high-pressure gas.

A gas cylinder comprising a cylinder valve and a gas cylinder liner assembly as described above, the cylinder valve being journaled in the valve seat 20 or connection kit 30 and communicating with the gas storage chamber 101.

It will be appreciated by persons skilled in the art that the embodiments of the utility model described above and shown in the drawings are by way of example only and are not limiting. The advantages of the present utility model have been fully and effectively realized. The functional and structural principles of the present utility model have been shown and described in the examples and embodiments of the utility model may be modified or practiced without departing from the principles described.

Claims (10)

1. Gas cylinder inner bag subassembly, its characterized in that includes:

the inner container is internally provided with an air storage cavity, and a connecting port communicated with the air storage cavity is formed in the inner container;

the valve seat is provided with a valve pipe which is connected with the inner container and is communicated with the gas storage cavity through the connecting port; the method comprises the steps of,

the connecting sleeve is hollow, fixedly sleeved on the outer side or the inner side of the valve tube and fixedly connected with the inner container.

2. The cylinder liner assembly of claim 1, wherein the valve seat has an outer extension extending radially outward along the valve tube and connecting the liner outer wall, one of the two surfaces of the liner outer wall and the outer extension adjacent to each other being provided with at least one rotation stop slot, the other one being provided with at least one rotation stop portion mateable within the rotation stop slot.

3. The gas cylinder liner assembly according to claim 1, wherein the liner comprises two end cylinders and a middle cylinder, the middle cylinder is located between the two end cylinders and is respectively communicated with the two end cylinders to form the gas storage cavity, one of the end cylinders and the middle cylinder forms an annular gap extending along the axial direction, and the other one of the end cylinders and the middle cylinder is correspondingly welded and connected with the end cylinder or the middle cylinder after being axially inserted into the annular gap.

4. The gas cylinder liner assembly according to claim 1, wherein the liner has an inner extension tube extending from the connection port in a direction toward the gas storage chamber, the connection sleeve includes an inner sleeve portion, an outer sleeve portion, and an annular bottom wall formed between the outer sleeve portion and the inner sleeve portion, the annular bottom wall, the inner wall of the outer sleeve portion, and the outer wall of the inner sleeve portion enclosing to form an annular gap, the valve tube being sleeved in the inner extension tube and inserted in the annular gap together with the inner extension tube.

5. The gas cylinder liner assembly of claim 4, including at least two seals, at least one of said seals being disposed between said outer jacket portion inner wall and said inner extension tube, at least one of said seals being disposed between said inner extension tube and said annular bottom wall.

6. The cylinder liner assembly of claim 4, wherein the valve tube has a connecting thread formed therein, the outer wall of the inner sleeve portion has an external thread for threadedly connecting the connecting thread, the inner wall of the inner sleeve portion has an internal thread for threadedly connecting the valve tube, and the internal thread and the external thread are oppositely threaded.

7. The gas cylinder liner assembly of claim 1, wherein the connection sleeve includes a connection tube and an overhang portion extending radially outwardly from an outer wall of the connection tube and integrally formed with the liner, the valve tube sealingly connected within the connection tube through the connection port, the gas cylinder liner assembly including at least one seal disposed between the connection tube and the valve tube.

8. The gas cylinder liner assembly of claim 1, wherein the liner has an extension tube extending from the connection port in a direction away from the gas storage chamber, the extension tube being sleeved in the valve tube, the connection sleeve being sleeve-shaped, the connection sleeve being sleeved in the valve tube and integrally formed with the extension tube, the gas cylinder liner assembly including at least one seal for being disposed between a cylinder valve and the valve tube, or for being disposed between a cylinder valve and the connection sleeve.

9. The cylinder liner assembly of claim 1, wherein the valve seat is metallic and the liner is plastic.

10. A gas cylinder, characterized by comprising a cylinder valve and a gas cylinder liner assembly according to any one of claims 1 to 9, wherein the cylinder valve is connected in the valve seat or the connection sleeve member and is communicated with the gas storage cavity.

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