Gas cylinder sheath and hydrogen storage device

Abstract

The utility model provides a gas cylinder sheath and a hydrogen storage device. The gas cylinder sheath comprises a sheath body which is wound into a ring shape, a gas bottle containing cavity is defined by the protective sleeve body, the protective sleeve body is provided with a containing cavity used for containing heat exchange media, and the protective sleeve body is provided with a notch which is formed in the axial direction of the protective sleeve body in a penetrating mode. According to the gas cylinder sheath, the wrapping effect on the gas cylinder is improved through the sheath body which is wound into the ring shape, the gas cylinder can be sleeved with the sheath body through the notches formed in the sheath body in the penetrating mode, the width of the notches can be increased or decreased along with deformation of the gas cylinder, and the gas cylinder can be conveniently wrapped. And the heat exchange effect of the heat exchange medium in the accommodating cavity and the gas cylinder is improved, so that the temperature adjusting effect of the gas cylinder sheath on the gas cylinder is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas equipment technical field, especially a gas cylinder sheath, and the utility model relates to a hydrogen storage device with the gas cylinder sheath. BACKGROUND

[0002] The gas cylinder is a container for containing gas, in order to ensure the use performance of the gas cylinder, for example, the hydrogen storage gas cylinder, when hydrogen is filled into the gas cylinder, the pressure in the gas cylinder rises rapidly, which makes the temperature in the gas cylinder rise rapidly. With the decrease of the pressure in the gas cylinder, the temperature of the gas cylinder becomes lower and lower. Therefore, it is usually necessary to set a sheath structure for adjusting the temperature of the gas cylinder outside the gas cylinder, and the heat exchange medium in the sheath structure exchanges heat with the gas cylinder, so as to prevent the temperature of the gas cylinder from being too high or too low. However, the sheath structure in the prior art is not reasonable in design, and cannot meet the deformation requirement of the gas cylinder during charging or discharging, thereby affecting the temperature adjustment performance of the sheath structure on the gas cylinder. SUMMARY

[0003] Therefore, the utility model aims at providing a gas cylinder sheath to meet the deformation requirement of the gas cylinder and improve the temperature adjustment effect on the gas cylinder.

[0004] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0005] A gas cylinder sheath, comprising a sheath body wound in a ring shape;

[0006] The sheath body defines a gas cylinder accommodating cavity, and the sheath body has a containing cavity for containing a heat exchange medium, and the sheath body is provided with an opening passing through in the axial direction of the sheath body.

[0007] Further, the sheath body is made of plastic embedded with heat-conducting particles.

[0008] Further, the heat-conducting particles include any one of a first particle made of copper, a second particle made of aluminum or a third particle made of graphite.

[0009] Further, the sheath body is provided with a liquid inlet and a liquid outlet communicating with the containing cavity; the liquid inlet and the liquid outlet are arranged at opposite ends of the axial direction of the sheath body, and / or the liquid inlet and the liquid outlet are arranged on both sides of the opening.

[0010] Further, the inner side of the sheath body is provided with a heat-conducting layer, and the sheath body abuts against the gas cylinder through the heat-conducting layer; and / or the containing cavity is arranged in the sheath body.

[0011] Further, it further comprises a protective shell sleeved outside the sheath body.

[0012] Further, the protective shell is wound in a ring shape, and the outer periphery of the protective shell is provided with two adjacent connecting sides; both the connecting sides are provided with outwardly folded flanges, and the two flanges are connected through a connecting assembly and make the protective shell abut against the sheath body.

[0013] Further, at least one of the flanges and the protective shell is provided with a reinforcing rib.

[0014] Further, in the radial direction of the sheath body, both the flanges are provided corresponding to the aperture; and / or, the protective shell is made of metal material.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] The gas cylinder sheath disclosed by the utility model is provided with a sheath body wound in a ring shape, which can better fit the shape of the gas cylinder, improve the wrapping effect of the gas cylinder, and through the aperture provided through the sheath body, the sheath body can be easily sleeved on the gas cylinder, and the width of the aperture can increase or decrease with the deformation of the gas cylinder, thereby improving the heat exchange effect of the heat exchange medium in the accommodating cavity and the gas cylinder, and improving the temperature regulation effect of the gas cylinder.

[0017] In addition, the sheath body is made of plastic embedded with heat-conducting particles, which is beneficial to the lightweight of the sheath body. Considering that the heat conductivity of plastic is relatively poor, embedding heat-conducting particles in plastic greatly changes the heat conductivity of the sheath body. The first particles made of copper, the second particles made of aluminum and the third particles made of graphite all have high heat conductivity and are easy to arrange and implement. The inlet and outlet are oppositely arranged at both ends of the sheath body, which is beneficial to the exhaust of the heat exchange medium when the heat exchange medium enters, prolongs the flow path of the heat exchange medium in the accommodating cavity, and improves the heat exchange effect of the heat exchange medium. The inlet and outlet are arranged on both sides of the aperture, which is beneficial to ensuring the flow effect of the heat exchange medium in the accommodating cavity and easy to arrange and implement.

[0018] In addition, the sheath body abuts against the gas cylinder through the heat-conducting layer, which can more quickly and effectively transfer heat between the gas cylinder and the sheath body, thereby better realizing the heat exchange function of the sheath body and enabling the gas cylinder to be in a more suitable temperature environment. By arranging the protective shell, the protective shell and the sheath body cooperate to form a double protection mechanism, which is beneficial to greatly reducing the risk of damage to the gas cylinder and ensuring the safe use of the gas cylinder. The protective shell is arranged in a ring shape, which can provide uniform protection to the sheath body in the circumferential direction. The two flanges are connected through the connecting assembly, which can ensure that the protective shell does not loosen or open in the circumferential direction, and always maintains close contact and effective protection to the sheath body.

[0019] Furthermore, by setting the reinforcing ribs, the structural strength of the turned-up edges and the stability in use are improved. In the radial direction of the sheath body, the two turned-up edges are arranged corresponding to the openings, which facilitates the convenience of the protective shell when being installed. The protective shell is made of metal material, so that the protective shell can withstand greater external force impact and extrusion, and the heat exchange efficiency between the sheath body and the external environment is improved.

[0020] In addition, another purpose of the utility model is to provide a hydrogen storage device, which comprises a gas cylinder and a gas cylinder sheath as described above arranged outside the gas cylinder.

[0021] The hydrogen storage device has the gas cylinder sheath, which prevents the temperature of the gas cylinder from being too high or too low, thereby ensuring the use performance of the gas cylinder. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the application, and are incorporated herein for purposes of illustration. The embodiments of the present application, and the explanations given, serve to explain the application, and are not intended to limit the application in any manner. In the drawings:

[0023] Figure 1 A structure schematic view of the gas cylinder sheath according to the first embodiment of the utility model;

[0024] Figure 2 A front view of Figure 1 ;

[0025] Figure 3 A sectional view along the A-A direction in Figure 2 ;

[0026] Figure 4 A structure schematic view of the sheath body according to the first embodiment of the utility model;

[0027] Figure 5 A structure schematic view of the protective shell according to the first embodiment of the utility model.

[0028] BRIEF DESCRIPTION OF DRAWINGS

[0029] 1, gas cylinder; 2, sheath body; 3, protective shell;

[0030] 201, opening; 202, accommodating cavity; 203, gas cylinder accommodating cavity; 204, liquid inlet; 205, liquid outlet; 206, heat conduction layer; 207, connecting side;

[0031] 301, turned-up edge; 3011, connecting hole; 3012, reinforcing rib. DETAILED DESCRIPTION

[0032] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other in the case of no conflict.

[0033] In the description of the utility model, it should be noted that if the terms indicating the orientation or position relationship such as "upper", "lower", "inner", "back" appear, it is based on the orientation or position relationship shown in the drawing, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as the limitation of the utility model. In addition, if the terms such as "first", "second" appear, they are also only for the description purpose, and cannot be understood as indicating or implying relative importance.

[0034] The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0035] Embodiment one

[0036] The embodiment relates to a gas cylinder sheath, and aims to solve the problem that the gas cylinder sheath in the prior art cannot meet the use requirement of deformation of the gas cylinder 1 during inflation or exhaust, thereby leading to poor temperature regulation effect on the gas cylinder 1.

[0037] In terms of overall structure, the gas cylinder sheath comprises a sheath body 2 wound in a ring shape. The sheath body 2 defines a gas cylinder containing cavity 203, and has a containing cavity 202 for containing heat exchange medium. The sheath body 2 is provided with an aperture 201 penetrating along the axial direction thereof.

[0038] The gas cylinder sheath can better fit the shape of the gas cylinder 1, is beneficial to improving the wrapping effect on the gas cylinder 1, and through the aperture 201 penetrating the sheath body 2, the sheath body 2 can be sleeved on the gas cylinder 1, and the width of the aperture 201 can increase with the increase of the diameter of the gas cylinder 1 during inflation and decrease with the decrease of the diameter of the gas cylinder 1 during exhaust, thereby being beneficial to improving the heat exchange effect between the heat exchange medium in the containing cavity 202 and the gas cylinder 1, and improving the temperature regulation effect on the gas cylinder 1.

[0039] Based on the overall introduction above, an exemplary structure of the gas cylinder sheath in the embodiment is shown in Figures 1 to 5 The cross section of the gas cylinder 1 is circular, and the cross section of the sheath body 2 is also circular, which is beneficial to arrangement and implementation, and is beneficial to the sleeving effect of the sheath body 2 on the gas cylinder 1. The gas cylinder 1 in the embodiment can be a gas cylinder 1 for storing hydrogen.

[0040] In the embodiment, the sheath body 2 extends along the axial direction of the gas cylinder 1, and both ends of the gas cylinder 1 are exposed outside the sheath body 2. In this way, the heat exchange area between the sheath body 2 and the gas cylinder 1 is increased, and the heat exchange uniformity of the gas cylinder 1 is further improved, so that the gas cylinder 1 is prevented from being supercooled or overheated.

[0041] In addition, the accommodating cavity 202 is arranged in the sheath body 2, and when the accommodating cavity 202 is filled with a suitable heat exchange medium (such as water, special cooling liquid, etc.), the temperature of the gas cylinder 1 can be adjusted through heat exchange between the heat exchange medium and the gas cylinder 1. For example, when the temperature of the gas cylinder 1 is too high, heat can be transferred to the heat exchange medium, thereby achieving the effect of cooling. Conversely, when the temperature of the gas cylinder 1 is too low, the heat exchange medium can also transfer heat to the gas cylinder 1, thereby achieving the effect of heating. In specific implementation, the volume of the accommodating cavity 202 can be 1 / 3 or 1 / 2 of the volume of the sheath body 2, which is beneficial to increase the heat exchange area between the sheath body 2 and the gas cylinder 1. Of course, the volume of the accommodating cavity can also be adjusted according to the use requirements.

[0042] In the embodiment, the aperture 201 is in the shape of a long strip extending along the axial direction of the sheath body 2, and the width of the aperture 201 is set based on the deformation degree of the gas cylinder 1. Specifically, the gas cylinder 1 has two states of maximum diameter d1 and minimum diameter d2 due to inflation or deflation, and the width of the aperture 201 should be greater than or equal to the difference between the maximum diameter d1 and the minimum diameter d2.

[0043] As a preferred embodiment, the sheath body 2 is made of plastic embedded with heat-conducting particles. Plastic is selected as the base material of the sheath body 2, and plastic is relatively light, which is beneficial to the lightweight of the sheath body 2. Considering that the thermal conductivity of plastic is relatively poor, in the embodiment, the thermal conductivity of the sheath body 2 is greatly changed by embedding heat-conducting particles in the plastic. In specific operation, the heat-conducting particles can be mixed into the plastic material and formed with the sheath body 2, so that the heat-conducting particles are embedded in the sheath body 2. The sheath body 2 can be made of PA (polyamide), which has high mechanical strength, high rigidity, high toughness, and excellent fatigue resistance.

[0044] In the embodiment, the sheath body 2 is made of plastic embedded with heat-conducting particles, which combines the advantages of plastic such as formability, light weight, corrosion resistance, and good thermal conductivity brought by the heat-conducting particles, so that the sheath body 2 can effectively protect the gas cylinder 1 and has good heat exchange performance. In addition, the sheath body 2 made of plastic has a certain elasticity, which can change with the change of the diameter of the gas cylinder 1, so as to facilitate the change of the width of the aperture 201.

[0045] In practice, the heat-conducting particles include any one of the following: a first particle made of copper, a second particle made of aluminum, or a third particle made of graphite. All three types of heat-conducting particles possess high thermal conductivity and are easy to arrange. If copper particles are used as the heat-conducting particles, when there is a temperature difference between the gas cylinder 1 and the heat exchange medium, heat can be rapidly transferred through the copper particles within the material of the sheath body 2, facilitating a fast and efficient heat exchange process.

[0046] If aluminum particles are used as the second heat-conducting particles, the weight of the gas cylinder sleeve can be further reduced while ensuring a certain level of heat conduction. If graphite particles are used as the third heat-conducting particles, they not only have high heat conduction but also good chemical stability, which helps ensure the performance stability of the gas cylinder sleeve during long-term use.

[0047] like Figure 4 As shown in the diagram, the sheath body 2 in this embodiment is provided with an inlet 204 and an outlet 205 communicating with the receiving cavity 202. The inlet 204 and the outlet 205 are arranged opposite each other at both ends of the sheath body 2 along the axial direction. This arrangement ensures that after the heat exchange medium enters from the inlet 204 at one end, it flows along a relatively clear path to the outlet 205 at the other end. This makes the flow direction of the heat exchange medium relatively singular and stable, thereby helping to improve the heat exchange efficiency. Furthermore, the stable flow field can ensure the temperature uniformity of the gas cylinder 1.

[0048] Furthermore, the heat exchange medium can be vented through the outlet 205 when it flows in through the inlet 204. Moreover, positioning the inlet 204 and outlet 205 at both ends of the axial direction facilitates connection to external pipelines and reduces interference between pipes. Additionally, the inlet 204 and outlet 205 at both ends are located on opposite sides of the notch 201, which facilitates implementation and allows for the flow of the heat exchange medium into and out of the receiving cavity 202.

[0049] Both the inlet 204 and the outlet 205 are located on the side wall of the notch 201, and extend beyond the notch 201 along its length. The positions of the inlet 204 and the outlet 205 can be adjusted according to usage requirements. It is important to note that when the width of the notch 201 is at its minimum, the inlet 204 and the outlet 205 should not interfere with the sheath body 2 to ensure their effectiveness.

[0050] To further improve the heat exchange effect of the sheath body 2, such as Figure 3As shown in the figures, a heat-conducting layer 206 is arranged on the inner side of the sheath body 2, and the sheath body 2 abuts against the gas cylinder 1 through the heat-conducting layer 206. The heat-conducting layer 206 can more quickly and effectively transfer heat between the gas cylinder 1 and the sheath body 2, thereby better achieving the heat exchange function of the sheath body 2 and ensuring that the gas cylinder 1 can be in a more suitable temperature environment

[0051] Specifically, the inner periphery of the sheath body 2 in contact with the gas cylinder 1 will have some small gaps or poor contact between the two. By arranging the heat-conducting layer 206 on the inner periphery of the sheath body 2, the gap between the inner periphery of the sheath body 2 and the outer periphery of the gas cylinder 1 can be filled, which helps to ensure that the heat transfer process will not be hindered by poor contact, thereby forming a continuous heat conduction path between the gas cylinder 1, the heat-conducting layer 206 and the sheath body 2.

[0052] As a feasible implementation, the heat-conducting layer 206 in the embodiment can be made of heat-conducting silica gel. The heat-conducting silica gel not only has certain heat-conducting properties, but also has good flexibility and filling properties. In addition, the heat-conducting silica gel is also conducive to filling the irregular gaps that may exist between the gas cylinder 1 and the sheath body 2, ensuring close contact while also achieving effective heat conduction. Furthermore, the heat-conducting silica gel also has certain adhesive effect, thereby improving the connection effect between the sheath body 2 and the gas cylinder 1.

[0053] As shown in the figures, Figure 1 , Figure 2 and Figure 5 The gas cylinder sheath in the embodiment also includes a protective shell 3 arranged outside the sheath body 2. The protective shell 3 and the sheath body 2 work together to form a double protection mechanism, which enables the gas cylinder 1 to be more fully protected in various complex environments and working conditions, thereby greatly reducing the risk of damage to the gas cylinder 1 and ensuring the safe use of the gas cylinder 1. During use, transportation, storage and other processes, the gas cylinder 1 may be affected by various external factors, such as collision, friction, extrusion and harsh environmental conditions. The protective shell 3 can act as an additional barrier to effectively resist these adverse factors and reduce the risk of damage to the gas cylinder 1 and its sheath.

[0054] In specific use, the protective shell 3 can directly bear the impact force, extrusion force and other physical effects from the outside world. When a collision or extrusion event occurs, the protective shell 3 will first bear the force, and by virtue of its strength and structural characteristics, it will disperse and buffer these external forces, avoiding or reducing their impact on the internal sheath body 2 and the gas cylinder 1.

[0055] As a preferred implementation, as shown in Figure 5As shown in FIG. 1, the protective shell 3 is wound in a ring shape, and the outer periphery of the protective shell 3 has two adjacent connection sides 207. The two connection sides 207 are each provided with an outwardly folded flange 301, and the two flanges 301 are connected by a connecting assembly and abut against the sheath body 2. Here, the two connection sides 207 are adjacent to each other to form a gap therebetween, and the gap is reduced with the tightening of the two flanges 301. The protective shell 3 is wound in a ring shape to provide uniform protection to the sheath body 2 in the circumferential direction, and the two flanges 301 are connected by the connecting assembly to ensure that the protective shell 3 does not loosen or open in the circumferential direction, and always maintains close contact and effective protection to the sheath body 2.

[0056] Specifically, the two flanges 301 on the protective shell 3 are each arranged along the axial direction of the protective shell 3, and the connecting assembly is a plurality of connecting assemblies arranged along the length direction of the flange 301. In this way, on the one hand, the two flanges 301 are connected together by the connecting assembly, and on the other hand, the structure after connection is more stable, thereby facilitating the enhancement of the strength of the connection part.

[0057] In this embodiment, the connecting assembly can be, for example, a bolt and nut combination. In this case, a plurality of connecting holes 3011 are provided through the two flanges 301, and the plurality of connecting holes 3011 on the two flanges 301 are arranged one by one in correspondence. The bolt is arranged through the two connecting holes 3011 that overlap in correspondence. When the bolt and nut combination is used, the two flanges 301 can be firmly connected together by tightening the bolt, and at the same time, pressure is applied to abut the protective shell 3 against the sheath body 2.

[0058] Further, at least one of the flange 301 and the protective shell 3 is provided with a reinforcing rib 3012. The reinforcing rib 3012 is arranged to improve the structural strength and stability of the flange 301 in use. In some embodiments, as shown in FIG. 1, the two ends of each flange 301 and the protective shell 3 are respectively provided with a reinforcing rib 3012, and the reinforcing rib 3012 is in a triangular shape. The structure is simple, easy to arrange and implement, and has good structural stability. Figure 5

[0059] Of course, a plurality of reinforcing ribs 3012 can also be arranged between other positions of the flange 301 and the protective shell 3, and the structural strength of the flange 301 is improved by the cooperation of the plurality of reinforcing ribs 3012. The position and number of the reinforcing rib 3012 can be adaptively adjusted according to the use requirements in specific implementation.

[0060] As shown in FIG. 1, the two flanges 301 are connected by the connecting assembly, and the protective shell 3 is abutted against the sheath body 2. Figure 1 and Figure 2 ​As shown in the drawings, in the radial direction of the sheath body 2, the two flanges 301 are both arranged corresponding to the aperture 201. Here, the corresponding arrangement refers to that, in the radial direction of the protective shell 3, the projection of the two flanges 301 at least partially overlaps with the projection of the aperture 201. Such arrangement is conducive to further improving the connection fastening of the protective shell 3 outside the sheath body 2, and the position of the flange 301 can be positioned through the position of the aperture 201, thereby facilitating the convenience of the protective shell 3 during the installation operation, and also helping to maintain the coherence of the entire gas cylinder sheath structure. At the same time, by arranging the two flanges 301 corresponding to the aperture 201, the layout of the protective shell 3 around the sheath body 2 is more regular, and a more orderly structure is visually presented.

[0061] The protective shell 3 in the embodiment is preferably made of metal material. The metal material has high strength and toughness, which enables the protective shell 3 to withstand greater external force impact and extrusion. When the gas cylinder 1 encounters accidental collision, extrusion and the like during use, transportation or storage, the protective shell 3 made of metal material can effectively disperse and buffer these external forces by virtue of its own high strength and toughness, thereby protecting the sheath body 2 and the gas cylinder 1 from serious damage.

[0062] In addition, the protective shell 3 made of metal material can serve as an auxiliary heat conduction path. For example, when the temperature of the gas cylinder 1 changes greatly, the metal protective shell 3 can utilize its own heat conduction performance to transfer heat from the sheath body 2 to the external surrounding environment, thereby further enhancing the heat exchange capacity of the entire gas cylinder sheath system.

[0063] The gas cylinder sheath described in the embodiment is conducive to adjusting the temperature of the gas cylinder 1 during the inflation or deflation of the gas cylinder 1 by the arrangement of the sheath body 2, which can reduce the temperature fluctuation during the inflation or deflation of the gas cylinder 1, so that the temperature of the gas cylinder 1 is within a suitable range. By arranging the protective shell 3 outside the sheath body 2, the protection performance of the gas cylinder 1 is improved.

[0064] Embodiment Two

[0065] The embodiment relates to a hydrogen storage device, which comprises a gas cylinder 1 and a gas cylinder sheath as in the embodiment one arranged outside the gas cylinder 1.

[0066] The hydrogen storage device described in the embodiment is conducive to preventing the temperature of the gas cylinder 1 from being too high or too low, thereby ensuring the use performance of the gas cylinder 1.

[0067] The above description is only a preferred embodiment of the utility model, and is not used to limit the utility model. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A gas cylinder sheath, characterized in that: comprising a sheath body (2) wound in a ring shape; the sheath body (2) defines a gas cylinder accommodating cavity (203), and has a containing cavity (202) for containing a heat exchange medium, and is provided with an aperture (201) penetrating through the sheath body (2) in the axial direction thereof.

2. The gas cylinder sheath according to claim 1, characterized in that: the sheath body (2) is made of plastic embedded with heat-conducting particles.

3. The gas cylinder sheath according to claim 2, characterized in that: the heat-conducting particles comprise any one of first particles made of copper, second particles made of aluminum, or third particles made of graphite.

4. The gas cylinder sheath according to claim 1, characterized in that: the sheath body (2) is provided with a liquid inlet (204) and a liquid outlet (205) in communication with the containing cavity (202); the liquid inlet (204) and the liquid outlet (205) are arranged at opposite ends of the sheath body (2) in the axial direction, and / or the liquid inlet (204) and the liquid outlet (205) are arranged on opposite sides of the aperture (201), respectively.

5. The gas cylinder sheath according to claim 1, characterized in that: the inner side of the sheath body (2) is provided with a heat-conducting layer (206), and the sheath body (2) abuts against a gas cylinder (1) through the heat-conducting layer (206); and / or the containing cavity is arranged in the sheath body (2) in a conformal manner.

6. The gas cylinder sheath according to any one of claims 1 to 5, characterized in that: further comprising a protective shell (3) sleeved outside the sheath body (2).

7. The gas cylinder sheath according to claim 6, characterized in that: the protective shell (3) is wound in a ring shape, and the outer periphery of the protective shell (3) has two adjacent connecting sides (207); each of the two connecting sides (207) is provided with an outwardly folded flange (301), and the two flanges (301) are connected through a connecting assembly and abut against the sheath body (2).

8. The gas cylinder sheath according to claim 7, characterized in that: at least one of the flange (301) and the protective shell (3) is provided with a reinforcing rib (3012).

9. The gas cylinder sheath according to claim 7, characterized in that: in the radial direction of the sheath body (2), the two flanges (301) are arranged in correspondence with the aperture (201); and / or the protective shell (3) is made of a metal material.

10. A hydrogen storage device, characterized in that: comprising a gas cylinder (1), and the gas cylinder sheath according to any one of claims 1 to 9 sleeved outside the gas cylinder (1). ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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