Gas cylinder fixing device and gas cylinder assembly with same

Abstract

The utility model provides a gas cylinder fixing device and a gas cylinder assembly with the gas cylinder fixing device. The gas cylinder fixing device comprises a base, a gas cylinder fixing part and a gas cylinder fixing part, the fixing assembly comprises an outer sleeve and an inner sleeve which are oppositely arranged, the outer sleeve is used for fixing the gas cylinder to the base, the outer sleeve and / or the base abut against the gas cylinder through the inner sleeve, the radial size of the inner sleeve is variable, and the outer sleeve and the inner sleeve are matched to fix the gas cylinder. According to the technical scheme, the problem that in the prior art, a gas cylinder fixing device is complex in structure can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, in particular to a gas cylinder fixing device and a gas cylinder assembly having the same. Background Art

[0002] With the increase of environmental awareness, new energy vehicles, especially hydrogen energy vehicles, are gradually becoming popular among the public. In China, the number of heavy trucks is close to 9 million, accounting for only about 4% of the total number of road vehicles, but the annual carbon dioxide emissions of heavy trucks account for about 54% of all models. Therefore, hydrogen heavy trucks have great strategic significance for achieving the dual carbon goals. The hydrogen storage method of hydrogen heavy trucks is mainly to store hydrogen in the form of high-pressure gas in hydrogen storage cylinders, and the hydrogen storage cylinders are integrated in the hydrogen storage system.

[0003] At present, most hydrogen storage cylinders are Type III hydrogen storage cylinders, which are carbon fiber wrapped cylinders. When the pressure inside the cylinder is high or low, the diameter of the cylinder will change. When the pressure in the cylinder is high, the increased diameter will increase the deformation displacement of the cylinder fixing assembly along the length direction, thereby causing the strength of the fixing assembly to fail. In the prior art, a spring is generally arranged between the fixing assembly and the saddle, or multiple springs are arranged between the fixing assemblies, which makes the device structure more complicated and inconvenient to install and disassemble. Utility Model Content

[0004] The utility model provides a gas cylinder fixing device and a gas cylinder assembly having the same, so as to solve the problem of complex structure of the gas cylinder fixing device in the prior art.

[0005] According to one aspect of the utility model, a gas cylinder fixing device is provided, which includes: a base; a fixing component, the fixing component includes an outer sleeve and an inner sleeve arranged relatively to each other, the outer sleeve is used to fix the gas cylinder on the base, the outer sleeve, and / or the base abuts against the gas cylinder through the inner sleeve, the radial size of the inner sleeve is variable, and the outer sleeve cooperates with the inner sleeve to fix the gas cylinder.

[0006] Furthermore, the outer side of the inner sleeve has a first abutment surface, the inner side of the inner sleeve has a second abutment surface, the inner sleeve abuts against the outer sleeve through the first abutment surface, and the inner sleeve abuts against the gas cylinder through the second abutment surface, the first abutment surface is a convex structure, and / or the second abutment surface is a groove structure.

[0007] Furthermore, the inner sleeve includes a plurality of support structures arranged at intervals along the circumferential direction, the plurality of support structures together form the inner sleeve, and each support structure is provided with a first abutting surface and a second abutting surface.

[0008] Furthermore, each support structure includes a plurality of support units connected in sequence along the circumferential direction, each support unit includes an upper support segment and a lower support segment, the top of the upper support segment forms a first abutment surface, and the bottom of the lower support segment forms a second abutment surface.

[0009] Furthermore, the inner sleeve has a corrugated structure along the circumferential direction.

[0010] Furthermore, the gas cylinder fixing device also includes an elastic pad, which is arranged on the inner side of the inner sleeve.

[0011] Furthermore, a limiting structure is provided on the outer sleeve, and the limiting structure can limit the relative position of the inner sleeve in the outer sleeve in the axial direction.

[0012] Furthermore, the outer sleeve has a plurality of limiting protrusions on one side facing the inner sleeve, and both ends of the outer sleeve along the axial direction are provided with limiting protrusions, and the plurality of limiting protrusions cooperate with each other to form a limiting structure.

[0013] Furthermore, the outer sleeve includes a plurality of outer rings connected in sequence along the circumferential direction, and two adjacent outer rings are detachably connected. The plurality of outer rings cooperate with each other to form a receiving space, and the inner sleeve and the gas cylinder are located in the receiving space.

[0014] According to another aspect of the utility model, a gas cylinder assembly is provided, which includes a gas cylinder and the above-mentioned gas cylinder fixing device.

[0015] By applying the technical solution of the utility model, the base can fix the position of the gas cylinder fixing device, and the fixing assembly includes an outer sleeve and an inner sleeve, the radial size of the inner sleeve is variable, and the outer sleeve cooperates with the inner sleeve to fix the position of the gas cylinder in the fixing assembly. Through the above arrangement, when the gas cylinder is in a high pressure state, the volume of the gas cylinder will expand, and the inner sleeve will absorb the stress generated by the gas cylinder on the inner sleeve after the expansion, and then the radial size of the inner sleeve will also change with the gas cylinder to fix the position of the gas cylinder, and at the same time, the strength failure of the inner sleeve can be avoided; when the gas cylinder is in a low pressure state, the volume of the gas cylinder will shrink, and the gas cylinder will unload the force on the inner sleeve, and the radial size of the inner sleeve will become smaller. In this way, only the inner sleeve can meet the requirements of the gas cylinder being in different pressure states, and the size of the inner sleeve can be changed according to the change of the gas cylinder to fix the position of the gas cylinder, avoiding the gas cylinder from moving in the axial or radial direction, while ensuring the fixing effect of the fixing assembly on the gas cylinder, the device structure is greatly simplified and the convenience of disassembly and assembly is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1A schematic diagram of assembling a gas cylinder fixing device and a gas cylinder provided in the first embodiment of the utility model is shown;

[0018] Figure 2 The structure diagram of the inner sleeve provided in the first embodiment of the utility model is shown;

[0019] Figure 3 A schematic diagram of the structure of a gas cylinder fixing device provided in Embodiment 1 of the present utility model is shown;

[0020] Figure 4 A structural schematic diagram of a gas cylinder assembly provided in Embodiment 1 of the present utility model is shown.

[0021] The above drawings include the following reference numerals:

[0022] 01. Gas cylinder;

[0023] 10. Base;

[0024] 20. Fixing components;

[0025] 21, outer jacket; 211, outer ring;

[0026] 22. Inner sleeve;

[0027] 2201, first abutting surface; 2202, second abutting surface;

[0028] 221. Support structure;

[0029] 2211, upper supporting section; 2212, lower supporting section;

[0030] 30. Elastic pad;

[0031] 40. Limiting protrusion;

[0032] 50. Flange; 60. Fastener;

[0033] 70. Reinforcement plate. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0035] like Figure 1 and Figure 2As shown, the embodiment of the utility model provides a gas cylinder fixing device, which includes: a base 10 and a fixing assembly 20. The fixing assembly 20 includes an outer sleeve 21 and an inner sleeve 22 arranged opposite to each other, the outer sleeve 21 is used to fix the gas cylinder 01 on the base 10, the outer sleeve 21 and the base 10 are in contact with the gas cylinder 01 through the inner sleeve 22, the radial size of the inner sleeve 22 is variable, and the outer sleeve 21 and the inner sleeve 22 cooperate to fix the gas cylinder 01.

[0036] Optionally, the outer sleeve 21 may abut against the gas cylinder 01 through the inner sleeve 22 , or the base 10 may abut against the gas cylinder 01 through the inner sleeve 22 .

[0037] By applying the technical solution of the utility model, the base 10 can fix the position of the gas cylinder fixing device, and the fixing assembly 20 includes an outer sleeve 21 and an inner sleeve 22. The radial size of the inner sleeve 22 is variable, and the outer sleeve 21 cooperates with the inner sleeve 22 to fix the position of the gas cylinder 01 in the fixing assembly 20. Through the above arrangement, when the gas cylinder 01 is in a high pressure state, the volume of the gas cylinder 01 will expand, and at this time, the inner sleeve 22 will absorb the stress generated by the expansion of the gas cylinder 01 on the inner sleeve 22, and then the radial size of the inner sleeve 22 will also change with the gas cylinder 01 to fix the position of the gas cylinder 01, and at the same time, the strength failure of the inner sleeve 22 can be avoided; when the gas cylinder 01 is in a low pressure state, the volume of the gas cylinder 01 will shrink, and the gas cylinder 01 will unload the force on the inner sleeve 22, and at this time, the radial size of the inner sleeve 22 will become smaller. In this way, when the gas cylinder 01 is in different pressure states, the size of the inner sleeve 22 can be changed according to the changes of the gas cylinder 01 to fix the position of the gas cylinder 01 and prevent the gas cylinder 01 from moving axially or radially. While ensuring the fixing effect of the fixing component 20 on the gas cylinder 01, the device structure is greatly simplified and the convenience of disassembly and assembly is improved.

[0038] Specifically, the base 10 and the outer sleeve 21 in the fixing assembly 20 are fixedly connected by welding.

[0039] In the present application, the inner sleeve 22 is an elastic structure, and the material of the inner sleeve 22 is not limited, as long as the stress on the inner sleeve 22 is less than the yield strength and tensile strength of the inner sleeve 22. Preferably, the inner sleeve 22 is made of steel, which has good yield strength and tensile strength performance and low production cost. Specifically, stainless steel, spring steel and the like can be used.

[0040] Among them, the inner sleeve 22 adopts an integrally formed structure. Compared with the prior art in which the deformation displacement is provided by the spring between the fixing assembly 20 and the base 10, when installing the spring, the preload force of the spring needs to be corrected in advance, which makes the installation more difficult. The inner sleeve 22 of the present application calculates the tensile strength in advance, and can be directly assembled with the outer sleeve 21 and the gas cylinder 01 after processing and forming, which is very convenient to operate.

[0041] Further, the outer side of the inner sleeve 22 has a first abutting surface 2201, and the inner side of the inner sleeve 22 has a second abutting surface 2202. The inner sleeve 22 abuts against the outer sleeve 21 through the first abutting surface 2201, and the inner sleeve 22 abuts against the gas cylinder 01 through the second abutting surface 2202. The first abutting surface 2201 is a convex structure, and the second abutting surface 2202 is a groove structure. Through the above arrangement, it can be ensured that the inner sleeve 22 has a deformation space for the inner sleeve 22 in the radial direction between the outer sleeve 21 and the gas cylinder 01, and in this way, the axial length of the inner sleeve 22 can be longer than the circumferential length of the gas cylinder 01, so as to provide the inner sleeve 22 with a deformation displacement in the circumferential direction when the gas cylinder 01 expands.

[0042] In another embodiment of the present application, the first abutting surface 2201 may be a convex structure, and the structure of the second abutting surface 2202 is not limited. In another embodiment, the second abutting surface 2202 may be a groove structure, and the structure of the first abutting surface 2201 is not limited. As long as the inner sleeve 22 can be ensured to be between the outer sleeve 21 and the gas cylinder 01, and there is a deformation space for the inner sleeve 22 in the radial direction, it will be sufficient.

[0043] In other embodiments, the inner sleeve 22 may be a corrugated sleeve structure arranged along the axial direction, and the radial dimension of the inner sleeve 22 may be adjusted by deforming in the axial direction, thereby enabling the gas cylinder 01 to generate radial deformation inside the inner sleeve 22 .

[0044] like Figures 1 to 3 As shown, the inner sleeve 22 includes a plurality of support structures 221 arranged at intervals along the circumferential direction, and the plurality of support structures 221 together form the inner sleeve 22, and each support structure 221 is provided with a first abutting surface 2201 and a second abutting surface 2202. Through the above arrangement, the intervals between the support structures 221 can provide the inner sleeve 22 with a deformation displacement in the circumferential direction, and thus when the plurality of support structures 221 are connected to fix the position of the gas cylinder 01, the intervals between the support structures 221 will become smaller, and at this time the inner sleeve 22 will provide a pre-tightening force for the gas cylinder 01 to fix the position of the gas cylinder 01 and reduce the displacement of the gas cylinder 01 when the volume changes. In this embodiment, the inner sleeve 22 includes two support structures 221. In other embodiments of the present application, the number of support structures 221 can also be set to 3, 5 or 7, etc.

[0045] Each support structure 221 includes a plurality of support units connected in sequence along the circumferential direction, and each support unit includes an upper support segment 2211 and a lower support segment 2212. The top of the upper support segment 2211 forms a first abutting surface 2201, and the bottom of the lower support segment 2212 forms a second abutting surface 2202. Through the above arrangement, the upper support segment 2211 and the lower support segment 2212 can form a space between the outer sleeve 21 and the inner sleeve 22 to place the inner sleeve 22. The inner sleeve 22 can abut and support the outer sleeve 21 through the first abutting surface 2201 on the upper support segment 2211, and contact the gas cylinder 01 through the second abutting surface 2202 on the lower support segment 2212. At the same time, the outer sleeve 21 limits the displacement of the inner sleeve 22 in the radial direction through the first abutting surface 2201.

[0046] In the present application, the specific structure of the inner sleeve 22 is not limited. The upper support segment 2211 and the lower support segment 2212 can be the same structure or different structures. The upper support segment 2211 and the lower support segment 2212 can be set to a rectangular structure, a conical structure, a trapezoidal structure or other special-shaped structures.

[0047] Specifically, the inner sleeve 22 is a corrugated structure along the circumferential direction. Through the above arrangement, the corrugated structure is easier to process than a variable structure such as a rectangle, and the corrugated structure can make it easier for the inner sleeve 22 to restore its original structure after being deformed. In this embodiment, the length of each support unit in the corrugated structure in the circumferential direction is not specifically limited.

[0048] Among them, the upper support section 2211 and the lower support section 2212 are set to be an arc structure. Preferably, the bending angle of the upper support section 2211 is greater than the bending angle of the lower support section 2212, so that the curvature of the lower support section 2212 can be relatively gentler than the upper support section 2211, and at the same time, the contact area between the lower support section 2212 and the gas cylinder 01 is increased, so that the stress can be transmitted to the inner sleeve 22 faster, so that the inner sleeve 22 can quickly sense the deformation of the gas cylinder 01 and absorb the stress caused by the deformation of the gas cylinder 01, thereby generating deformation displacement, reducing the force on the outer sleeve 21 while stably fixing the position of the gas cylinder 01.

[0049] In other embodiments of the present application, multiple lower support segments may be provided between two adjacent upper support segments 2211, or multiple upper support segments 2211 may be provided between two adjacent lower support segments 2212, or a support unit may include multiple upper support segments 2211 and multiple lower support segments 2212 connected in sequence. In this embodiment, two lower support segments 2212 are provided between two adjacent upper support segments 2211.

[0050] Preferably, the structures of the support units on each support structure 221 are the same, so that the inner sleeve 22 is subjected to uniform force at different circumferential positions, thereby avoiding excessive difference in the deformation of the inner sleeve 22 at different circumferential positions, thereby extending the overall service life of the inner sleeve 22.

[0051] Specifically, the gas cylinder fixing device further includes an elastic pad 30, which is arranged on the inner side of the inner sleeve 22. One side of the elastic pad 30 abuts against the inner sleeve 22, and the other side of the elastic pad 30 abuts against the gas cylinder 01. Through the above arrangement, the elastic pad 30 can deform with the gas cylinder 01 and can buffer the volume deformation of the gas cylinder 01. At the same time, the elastic pad 30 can increase the friction between the fixing component 20 and the gas cylinder 01, so as to enhance the fixing effect of the fixing component 20 on the gas cylinder 01.

[0052] In the application, the elastic pad 30 can be made of rubber or silicone, as long as it can deform when subjected to force and can still return to its original shape after the force is released.

[0053] In other embodiments of the present application, an anti-slip protrusion or groove may also be provided on the side of the elastic pad 30 facing the gas cylinder 01 to further enhance the friction between the gas cylinder 01 and the fixing assembly 20 .

[0054] like Figure 2 and Figure 4 As shown, a limiting structure is provided on the outer sleeve 21, and the limiting structure can limit the relative position of the inner sleeve 22 in the axial direction inside the outer sleeve 21. Because the inner sleeve 22 needs to be deformed, there is no fixed connection relationship between the inner sleeve 22, the outer sleeve 21 and the elastic pad 30. Although the gas cylinder 01 will generate stress on the elastic pad 30 and the fixing assembly 20 when it is deformed, and will squeeze the elastic pad 30 and the fixing assembly 20, that is, the inner sleeve 22 will not be excessively displaced relative to the outer sleeve 21 and the elastic pad 30. However, there is no connection relationship between the inner sleeve 22 and the outer sleeve 21, and there is still a situation where the inner sleeve 22 and the outer sleeve 21 will be relatively displaced. If the inner sleeve 22 and the outer sleeve 21 are relatively displaced, the fixing effect of the fixing assembly 20 on the gas cylinder 01 will be reduced. Through the above-mentioned arrangement, it can be ensured that the first abutting surface 2201 of the inner sleeve 22 is always inside the outer sleeve 21, so as to prevent the inner sleeve 22 from sliding out or falling off from the outer sleeve 21 when it is deformed, so as to ensure the stability of the fixing assembly 20 on the gas cylinder 01.

[0055] In this embodiment, the limiting structure can be arranged on the side of the outer sleeve 21 away from the inner sleeve 22, or on the side facing the inner sleeve 22. The limiting structure can extend radially to the elastic layer, so that the limiting structure has a better limiting effect.

[0056] Specifically, the outer sleeve 21 has a plurality of limiting protrusions 40 on one side facing the inner sleeve 22, and both ends of the outer sleeve 21 along the axial direction are provided with limiting protrusions 40, and the plurality of limiting protrusions 40 cooperate with each other to form a limiting structure. Through the above arrangement, the inner sleeve 22 is located inside the plurality of limiting protrusions 40 in the axial direction of the outer sleeve 21, so that the position of the inner sleeve 22 in the axial direction is limited to avoid relative displacement between the inner sleeve 22 and the outer sleeve 21 in the axial direction.

[0057] Among them, two limiting protrusions 40 can be set, and the two limiting protrusions 40 are respectively arranged axially at the two ends of the inner side of the outer sleeve 21, or multiple limiting protrusions 40 are respectively arranged on the two ends of the inner side of the outer sleeve 21. In this embodiment, the number of limiting protrusions 40 is not limited, and can be set to three, five, ten or twelve.

[0058] In this embodiment, the specific form of the limiting protrusion 40 is not limited, and the limiting protrusion 40 can be configured as a limiting strip, or a limiting block or other structures.

[0059] like Figure 3 As shown, the outer sleeve 21 includes a plurality of outer rings 211 connected in sequence along the circumferential direction, and two adjacent outer rings 211 are detachably connected. The plurality of outer rings 211 cooperate with each other to form a receiving space, and the inner sleeve 22 and the gas cylinder 01 are located in the receiving space. Through the above arrangement, different numbers and sizes of outer rings 211 can be selected to form the outer sleeve 21 according to different specifications and models of gas cylinders 01, thereby improving the applicability of the outer sleeve 21. Moreover, the installation and disassembly are very convenient, which improves the convenience of assembling or replacing the fixing assembly 20.

[0060] Specifically, at least one outer ring 211 is connected to the base 10 , and the plurality of support structures 221 are arranged in one-to-one correspondence with the plurality of outer rings 211 .

[0061] Preferably, there is a gap between each outer ring 211. With the above arrangement, when adjacent outer rings 211 are connected close together, the inner sleeve 22 will be squeezed and elastically deformed, thereby providing the gas cylinder 01 with the preload force required for installation.

[0062] like Figure 4 As shown, flanges 50 are respectively provided at both ends of the outer ring 211 along the circumferential direction, and two adjacent outer rings 211 are connected by the flanges 50. The flanges 50 have corresponding connection holes, and two adjacent flanges 50 can be connected by fasteners 60. Through the above arrangement, the structure is simple, not only the disassembly and assembly operation is very convenient, but also the production cost of the device is saved.

[0063] Specifically, a reinforcing plate 70 is further provided between the flange 50 and the outer ring 211. In the present application, the outer ring 211 is made of metal and is also processed by an integral molding process, so that the structural strength of the fixing assembly 20 can be ensured. The reinforcing plate 70 is welded between the flange 50 and the outer ring 211 to strengthen the connection strength between the flange 50 and the outer ring 211, and at the same time prevent the flange 50 and the outer ring 211 from being deformed, which can further improve the structural strength of the outer ring 211.

[0064] In another embodiment of the utility model, a gas cylinder assembly is provided, which includes a gas cylinder 01 and the above-mentioned gas cylinder fixing device. Through the above-mentioned arrangement, when installing the gas cylinder 01, the adjacent outer rings 211 are connected close together, and the inner sleeve 22 will be squeezed and elastically deformed, so that the pre-tightening force required for installation can be provided to the gas cylinder 01, and at the same time, the friction effect of the elastic pad 30 on the gas cylinder can be cooperated to fix the position of the gas cylinder 01 relative to the base 10. When the gas in the gas cylinder 01 changes, the deformation of the gas cylinder 01 can be absorbed by the inner sleeve 22 with a corrugated structure, further ensuring that the gas cylinder 01 maintains a relatively stable and static working state on the base 10.

[0065] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0066] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0067] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0068] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0069] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0070] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. 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 fixing device, characterized in that: The gas cylinder fixing device comprises: Base (10); A fixing assembly (20), the fixing assembly (20) comprising an outer sleeve (21) and an inner sleeve (22) arranged opposite to each other, the outer sleeve (21) being used to fix the gas cylinder (01) on the base (10), the outer sleeve (21) and / or the base (10) being in contact with the gas cylinder (01) through the inner sleeve (22), the radial dimension of the inner sleeve (22) being variable, the outer sleeve (21) and the inner sleeve (22) cooperating to fix the gas cylinder (01).

2. The gas cylinder fixing device according to claim 1, characterized in that: The outer side of the inner sleeve (22) has a first abutting surface (2201), and the inner side of the inner sleeve (22) has a second abutting surface (2202). The inner sleeve (22) abuts against the outer sleeve (21) via the first abutting surface (2201), and the inner sleeve (22) abuts against the gas cylinder (01) via the second abutting surface (2202). The first abutting surface (2201) is a convex structure, and / or the second abutting surface (2202) is a concave structure.

3. The gas cylinder fixing device according to claim 2, characterized in that: The inner sleeve (22) comprises a plurality of support structures (221) arranged at intervals along the circumferential direction, the plurality of support structures (221) together form the inner sleeve (22), and each of the support structures (221) is provided with the first abutment surface (2201) and the second abutment surface (2202).

4. The gas cylinder fixing device according to claim 3, characterized in that: Each of the support structures (221) includes a plurality of support units connected in sequence along the circumferential direction, and each of the support units includes an upper support segment (2211) and a lower support segment (2212), the top of the upper support segment (2211) forms the first abutment surface (2201), and the bottom of the lower support segment (2212) forms the second abutment surface (2202).

5. The gas cylinder fixing device according to any one of claims 1 to 4, characterized in that: The inner sleeve (22) is a corrugated structure along the circumferential direction.

6. The gas cylinder fixing device according to claim 1, characterized in that: The gas cylinder fixing device further comprises an elastic pad (30), and the elastic pad (30) is arranged on the inner side of the inner sleeve (22).

7. The gas cylinder fixing device according to claim 1, characterized in that: The outer sleeve (21) is provided with a limiting structure, and the limiting structure can limit the relative position of the inner sleeve (22) in the axial direction within the outer sleeve (21).

8. The gas cylinder fixing device according to claim 7, characterized in that: The outer sleeve (21) has a plurality of limiting protrusions (40) on one side facing the inner sleeve (22), and both ends of the outer sleeve (21) arranged along the axial direction are provided with the limiting protrusions (40), and the plurality of limiting protrusions (40) cooperate with each other to form the limiting structure.

9. The gas cylinder fixing device according to claim 1, characterized in that: The outer sleeve (21) comprises a plurality of outer rings (211) connected in sequence along the circumferential direction, and two adjacent outer rings (211) are detachably connected. The plurality of outer rings (211) cooperate with each other to form a receiving space, and the inner sleeve (22) and the gas cylinder (01) are located in the receiving space.

10. A gas cylinder assembly, characterized in that: The gas cylinder assembly comprises a gas cylinder (01) and a gas cylinder fixing device according to any one of claims 1 to 9.

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