阅读说明：本技术 塑料内胆高压容器 (Plastic inner container high-pressure container ) 是由 于海泉 刘超 张强 于 2019-03-25 设计创作，主要内容包括：本发明提供了一种塑料内胆高压容器,包括瓶头,瓶头设有盘形凸缘,塑料内胆与瓶头一体成型,且塑料内胆包覆所述盘形凸缘,形成内侧包覆部和外侧包覆部；瓶头的内端通过螺纹连接的方式设置有螺母,螺母向外端方向顶紧所述内侧包覆部,使内侧包覆部夹紧在盘形凸缘与所述螺母之间。本发明通过在瓶头上设置盘形凸缘,将塑料内胆与瓶头一体成型,使塑料内胆包覆盘形凸缘,通过在瓶头的内端设置螺母,通过螺母顶紧内侧包覆部,使内侧包覆部夹紧在盘形凸缘与螺母之间,从而螺母将塑料内胆与瓶头的连接起始点牢牢钳住,在高压情况下,保证瓶头与塑料内胆的位移同步,防止高压情况下塑料内胆变形时从与金属瓶端头的连接起始点撕裂。(The invention provides a plastic liner high-pressure container, which comprises a bottle head, wherein the bottle head is provided with a disc-shaped flange, the plastic liner and the bottle head are integrally formed, and the plastic liner coats the disc-shaped flange to form an inner coating part and an outer coating part; the inner end of the bottle head is provided with a nut in a threaded connection mode, and the nut tightly props the inner side coating part towards the outer end direction, so that the inner side coating part is clamped between the disc-shaped flange and the nut. The invention has the advantages that the disk-shaped flange is arranged on the bottle head, the plastic liner and the bottle head are integrally molded, the disk-shaped flange is coated on the plastic liner, the nut is arranged at the inner end of the bottle head, the inner coating part is tightly propped against the nut, and the inner coating part is clamped between the disk-shaped flange and the nut, so that the nut firmly clamps the connection starting point of the plastic liner and the bottle head, the bottle head and the plastic liner are ensured to be synchronously displaced under the high pressure condition, and the plastic liner is prevented from being torn from the connection starting point with the end of the metal bottle when being deformed under the high pressure condition.)

1. A plastic liner high-pressure container comprises a plastic liner and a metal bottle head penetrating through the plastic liner, wherein the plastic liner and the metal bottle head are integrally formed by injection molding; the bottle head main body penetrates through the plastic liner and is provided with an inner end positioned inside the plastic liner and an outer end positioned outside the plastic liner;

the plastic inner container covers the disc-shaped flange, an inner side covering part is formed on one side, close to the inner end, of the disc-shaped flange, and an outer side covering part is formed on one side, close to the outer end, of the disc-shaped flange;

the inner end is provided with a nut in a threaded connection mode, and the nut tightly pushes the inner side coating part towards the outer end direction.

2. The high-pressure container with the plastic liner as claimed in claim 1, wherein a clamping flange is provided on a side of the nut abutting against the inner cladding, and the inner cladding is formed with a clamping groove adapted to the clamping flange.

3. The plastic liner high pressure container as claimed in claim 2, wherein the clinch flange is provided with a slip-proof structure.

4. The high pressure container with plastic liner as claimed in claim 1, wherein a first engaging groove is formed on a surface of the disc-shaped flange adjacent to the inner end, and a first protrusion engaging with the first engaging groove is formed on the inner covering portion.

5. The high-pressure container with the plastic liner as claimed in claim 4, wherein the first engaging groove is a dovetail groove, and the first protrusion is a dovetail protrusion engaged with the first engaging groove.

6. The high pressure container with plastic liner as claimed in claim 1, wherein a second engaging groove is formed on a surface of the disc-shaped flange adjacent to the outer end, and a second protrusion engaging with the second engaging groove is formed on the outer covering portion.

7. The high-pressure container with the plastic liner as claimed in claim 6, wherein the second slot is a dovetail groove, and the second protrusion is a dovetail protrusion engaged with the second slot.

8. The high pressure container with plastic liner as claimed in claim 6 or 7, wherein the outer side of the plastic liner is provided with a winding layer, and the outer cladding part is clamped between the disc-shaped flange and the winding layer.

9. The high pressure container with a plastic liner as claimed in claim 8, wherein the head body is provided at an outer circumference thereof with an insertion groove, and the winding layer is inserted into the insertion groove.

10. The high pressure container with a plastic inner container as claimed in claim 1, wherein the disc-shaped flange is provided with a through hole, and the plastic inner container fills the through hole.

11. The high pressure container with plastic liner as claimed in claim 10, wherein the through hole is a stepped hole formed by two holes having different diameters coaxially connected, and the hole having the larger diameter is closer to the outer end.

12. The high pressure container with a plastic liner as claimed in any one of claims 1 to 7, wherein a third engaging groove is formed on the outer circumference of the bottle head main body, and a third protrusion engaged with the third engaging groove is formed on the inner covering portion.

Technical Field

The invention relates to the technical field of pressure containers, in particular to a plastic liner high-pressure container.

Background

With the continuous and deep environmental protection requirements, new energy and clean energy technologies are continuously developed in recent years. The use of high density, clean energy, represented by hydrogen, is continually being promoted. Meanwhile, new requirements are provided for the industries of containing, storing and transporting gas energy. Accordingly, the IV type fully-wound composite gas cylinder with higher volume-weight ratio and fatigue resistance is valued by the storage and transportation industry.

The IV type fully-wound composite material gas cylinder is characterized in that: the inner container made of plastic material is used for sealing, and the resin-based composite material formed by a fiber winding process is used as a framework for bearing pressure. At present, in part of patent achievements at home and abroad, a plurality of structural modes and manufacturing methods of metal bottle heads (or called bottle mouths) with plastic inner containers are provided, and the technical problems of the structural modes and the manufacturing methods mentioned in the patents are as follows: firstly, the pressure for bearing and installing the gas cylinder is low. Because the metal bottle head and the plastic liner have poor connectivity, the metal bottle head and the plastic liner deform asynchronously under the action of high pressure, so that the interface of the metal material and the plastic material is separated, leakage occurs, and even potential safety hazards are caused. And secondly, the temperature of the gas cylinder fluctuates greatly in the gas loading and unloading process, and due to expansion with heat and contraction with cold, the shrinkage rates of the metal cylinder head and the nonmetal plastic liner are different, so that a small gap is generated on a connecting interface of the metal material and the plastic material, and leakage occurs.

Thus, there is a need in the art for a plastic liner high pressure vessel that is highly sealed and capable of withstanding high pressure gas filling.

Disclosure of Invention

In order to solve the above technical problems, the present invention provides a plastic liner high pressure container, so as to solve the problems in the prior art that the metal port and the plastic liner have poor connectivity, and the metal port and the plastic liner deform asynchronously under the action of high pressure, so that the interface between the metal material and the plastic material is separated, thereby causing leakage, and even the plastic liner and the bottle head are torn at the connection starting point, thereby causing potential safety hazards.

Aiming at the problems, the invention provides a plastic liner high-pressure container which comprises a plastic liner and a metal bottle head penetrating through the plastic liner, wherein the plastic liner and the metal bottle head are integrally formed by injection molding, and the metal bottle head comprises a bottle head main body and a disc-shaped flange arranged on the periphery of the bottle head main body in a protruding mode; the bottle head main body penetrates through the plastic inner container and is provided with an inner end positioned inside the plastic inner container and an outer end positioned outside the plastic inner container.

The plastic inner container covers the disc-shaped flange, an inner covering part is formed on one side, close to the inner end, of the disc-shaped flange, and an outer covering part is formed on one side, close to the outer end, of the disc-shaped flange.

The inner end is provided with a nut in a threaded connection mode, and the nut tightly pushes the inner side coating part towards the outer end direction.

Preferably, one side of the nut, which abuts against the inner side coating portion, is provided with a clamping flange, and the inner side coating portion is provided with a clamping groove matched with the clamping flange.

Preferably, the clinch flange is provided with a non-slip structure.

Preferably, a first clamping groove is formed in the surface of one side, close to the inner end of the bottle head, of the disc-shaped flange, and a first protrusion clamped with the first clamping groove is formed in the inner side coating portion.

Preferably, the first slot is a dovetail slot, and the first protrusion is a dovetail protrusion engaged with the first slot.

Preferably, a second clamping groove is formed in one side, close to the outer end, of the disc-shaped flange, and a second protrusion clamped with the second clamping groove is arranged on the outer side wrapping portion.

Preferably, the second slot is a dovetail slot, and the second protrusion is a dovetail protrusion engaged with the second slot.

Preferably, the outer side of the plastic inner container is provided with a winding layer, and the outer side coating part is clamped between the disc-shaped flange and the winding layer.

Preferably, the periphery of the bottle head main body is provided with an embedded groove, and the winding layer is embedded into the embedded groove.

Preferably, a through hole is formed in the disc-shaped flange, and the through hole is filled with the plastic inner container.

Preferably, the through hole is a stepped hole, the stepped hole is formed by coaxially connecting two holes with different diameters, and the hole with the larger diameter is closer to the outer end.

Preferably, the periphery of the bottle head main body is provided with a third clamping groove, and the inner side coating part is provided with a third protrusion clamped with the third clamping groove.

According to the technical scheme, the invention has at least the following advantages and positive effects:

in the invention, the disk-shaped flange is arranged on the bottle head main body, and the plastic liner and the metal bottle head are integrally formed, so that the disk-shaped flange is coated by the plastic liner, the plastic liner and the metal bottle head are combined into a tight whole, and the tightness of the seal between the plastic liner and the metal bottle head is effectively improved; the nut is arranged at the inner end of the metal bottle head, and the inner side coating part is tightly pressed by the nut, so that the inner side coating part is clamped between the disc-shaped flange and the nut, the connection starting point of the plastic liner and the metal bottle head (namely the combination starting point of the inner side coating part and the bottle head main body) is firmly clamped by the nut, the metal bottle head and the plastic liner are ensured to be synchronously displaced under the high-pressure condition, and the plastic liner is prevented from being torn from the connection starting point of the metal bottle head when being deformed under the high-pressure condition.

Drawings

FIG. 1 is a sectional view of the port structure of the high-pressure container with plastic liner according to one embodiment of the present invention;

fig. 2 to 4 are partially sectional schematic views of the connection structure of the metal bottle head, the plastic liner, the nut, the winding layer and other components in the embodiments of the present invention.

The reference numerals are explained below: 1. a metal bottle head; 11. a bottle head main body; 111. an inner end; 112. an outer end; 113. a third card slot; 114. a groove is embedded; 12. a disk-shaped flange; 121. a first card slot; 122. a second card slot; 123. a through hole; 2. a plastic inner container; 21. an inner coating portion; 22. an outer coating portion; 3. a nut; 31. clamping the flange; 4. and (4) winding the layers.

Detailed Description

Exemplary embodiments that embody features and advantages of the invention are described in detail below in the specification. It is to be understood that the invention is capable of other embodiments and that various changes in form and details may be made therein without departing from the scope of the invention and the description and drawings are to be regarded as illustrative in nature and not as restrictive.

Referring to fig. 1 to 4, an embodiment of the present invention provides a plastic liner high pressure container used as a storage bottle/can for storing high pressure gas.

The plastic liner high-pressure container mainly comprises a plastic liner 2 and a metal bottle head 1 penetrating through the plastic liner 2, wherein the plastic liner 2 and the metal bottle head 1 are integrally formed by injection molding. The main body part of the plastic liner is cylindrical, two ends of the main body part are closed by an elliptic, spherical or dished seal head part, and the main body part and the seal head part are of an integral structure. The metal bottle head 1 penetrates out of the sealing head part of the plastic inner container. Fig. 1 to 4 only show the structure of the joint of the metal bottle head 1 and the plastic liner 2, that is, the structure of one end port of the plastic liner high-pressure container.

In this embodiment, the metal bottle head 1 includes a head body 11 and a disk-shaped flange 12 protruding from the outer periphery of the head body 11. The metal bottle head 1 is generally made of metal material with relatively high melting point, so that in the specific manufacturing process, the plastic liner 2 and the metal bottle head 1 can be integrally injection molded by matching the molded metal bottle head 1 with a corresponding injection mold. The tip body 11 extends through the plastic liner 2 and has an inner end 111 located inside the plastic liner 2 and an outer end 112 located outside the plastic liner 2. The plastic liner 2 covers the disc-shaped flange 12, an inner covering part 21 is formed on one side of the disc-shaped flange 12 close to the inner end 111, and an outer covering part 22 is formed on one side of the disc-shaped flange 12 close to the outer end 112, so that the tightness of the seal between the plastic liner and the bottle head is improved.

Under the condition of high pressure, the connection starting point of the plastic liner 2 and the metal bottle head 1 is the place which is most easily torn due to deformation, on one hand, the connection starting point of the plastic liner 2 and the metal bottle head 1 is often the place with the fastest deformation speed when the plastic liner 2 expands and deforms; on the other hand, the connection starting point of the plastic liner 2 and the metal bottle head 1 is the place where stress concentration is most likely to occur. In order to solve this problem, in this embodiment, the inner end 111 is provided with the nut 3 by screwing, and the nut 3 presses the inner coating 21 toward the outer end 112, so that the inner coating 21 is clamped between the disc-shaped flange 12 and the nut 3. The direction of the outer end 112 is also the direction from the inner end 111 to the outer end 112, so that the nut 3 firmly clamps the connection starting point of the plastic liner 2 and the metal bottle head 1 (i.e. the combination starting point of the inner cladding 21 and the bottle head body 11), thereby ensuring that the displacement of the metal bottle head 1 and the plastic liner 2 is synchronous under high pressure, and preventing the deformation displacement of the inner cladding 21 from exceeding the displacement of the metal bottle head 1 to generate relative movement when the plastic liner 2 deforms under high pressure, thereby preventing the connection starting point of the metal bottle head 1 from being torn.

In the actual production manufacturing, the nut 3 can be screwed at the inner end 111 of the bottle head main body 11 according to a preset position, then the metal bottle head 1 screwed with the nut 3 is matched with a corresponding injection mold to complete the integrated molding of the plastic liner 2, the metal bottle head 1 and the nut 3, the plastic liner 2 can be combined with the metal bottle head 1 and the nut 3 more tightly and fully through the injection molding mode, on one hand, the sealing performance of the plastic liner 2 and the metal bottle head 1 can be ensured, and on the other hand, the connection strength and reliability of the plastic liner 2 and the metal bottle head 1 and the nut 3 can be effectively improved. The metal bottle head 1 and the nut 3 are preferably made of hard die steel, so that the nut 3 is guaranteed to have the same hardness as the metal bottle head 1 when being bolted and cannot be damaged easily. Before the plastic inner container 2, the metal bottle head 1 and the nut 3 are integrally formed by using a casting process, the metal bottle head 1 and the nut 3 should be fully preheated. Or after the plastic liner 2 and the metal bottle head 1 are integrally formed through an injection molding process, the nut 3 is screwed on the inner end 111 of the bottle head main body 11, so that the nut 3 tightly pushes the inner side coating part 21 towards the outer end 112, and an extrusion pre-tightening force to the disc-shaped flange 12 is provided for a connection starting point of the plastic liner 2 and the metal bottle head 1 (namely, a combination starting point of the inner side coating part 21 and the bottle head main body 11), thereby preventing the connection starting point from being torn due to relative deformation displacement.

In one embodiment, as shown in fig. 2 and 3, the side of the nut 3 abutting against the inner cladding 21 is provided with a clamping flange 31, and the inner cladding 21 is provided with a clamping groove adapted to the clamping flange 31 (in the figure, the clamping groove coincides with the clamping flange 31). Therefore, when the pressure of high-pressure gas in the gas cylinder is applied, even if the plastic liner 2 expands outwards and deforms, the clamping flange 31 on the nut 3 clamps the inner cladding part 21 through the clamping groove, and the nut 3 tightly pushes the inner cladding part 21, so that the inner cladding part 21 cannot move out from between the nut 3 and the disc-shaped flange 12, the synchronous movement of the metal bottle head 1 and the plastic liner 1 when the plastic liner 2 deforms is further ensured, and the plastic liner 2 is prevented from being torn from the connection starting point of the metal bottle head 1 when deforming under the high-pressure condition. In addition, the clamping flange 31 and the clamping groove can increase the contact area between the nut 3 and the inner coating portion 21, so as to increase the friction force, so that the nut 3 is difficult to rotate, and further, the nut 3 has the self-locking function, so that the looseness can be effectively prevented, and the compression of the nut 3 on the inner coating portion 21 can be ensured. In order to further increase the frictional force between the nut 3 and the inner coating portion 21 and improve the self-locking capability of the nut 3, notches, knurls, longitudinal anti-slip threads, or the like may be provided around the outer side of the clinching flange 31 as an anti-slip structure, so that the frictional force between the nut 3 and the inner coating portion 21 is increased and the self-locking capability of the nut 3 is further improved.

In one embodiment, as shown in fig. 2 and 3, a first locking groove 121 is formed on one side of the disc-shaped flange 12 close to the inner end 111 of the bottle head main body 11, and the first locking groove 121 may be a continuous ring shape in the circumferential direction or an intermittent ring shape; one or more first card slots 121 may be opened in the radial direction. The inner cover 21 has a first protrusion (in the figure, the first protrusion overlaps the first engaging groove 121) that engages with the first engaging groove 121. By this arrangement, the contact area of the plastic liner 2 with the disc-shaped flange 12 is further increased, and the sealing performance and the reliability of the connection are improved. Particularly, when the nut 3 is provided, the nut 3 tightly presses the inner cladding 21 of the plastic liner 2 against the disc-shaped flange 12, so that the first protrusion on the inner cladding 21 is difficult to be pulled out from the first engaging groove 121, the first protrusion on the inner cladding 21 and the first engaging groove 121 are always in an engaged state, and slippage or separation between the inner cladding 21 and the disc-shaped flange 12 is effectively prevented.

In order to further improve the connection reliability between the inner coating portion 21 and the disk-shaped flange 12, the first engaging groove 121 may be formed as a dovetail groove, and the first protrusion may be formed as a dovetail protrusion engaged with the first engaging groove 121. In the injection molding process, the scheme is not difficult to realize, and the structure with large inside and small outside in the tail groove is matched with the structure with large head and small neck of the tail lug, so that the dovetail lug is difficult to pull out from the dovetail groove, the connection reliability between the inner cladding part 21 and the disk-shaped flange 12 is further improved, and the relative movement or the separation is prevented. The third engaging groove 113 may be formed on the outer periphery of the bottle head body 11, and the inner coating portion 21 may be provided with a third protrusion (in the drawing, the third protrusion overlaps the third engaging groove 113) that engages with the third engaging groove 113, so that the inner coating portion 21 is prevented from moving or tilting in the axial direction by the mutual engagement of the third engaging groove 113 and the third protrusion, thereby further ensuring the close contact between the inner coating portion 21 and the disc-shaped flange 12 and preventing the first protrusion of the inner coating portion 21 from being pulled out of the first engaging groove 121 of the disc-shaped flange 12.

As shown in fig. 4, in order to improve the connection reliability between the outer cladding 22 and the disc-shaped flange 12, similarly, a second locking groove 122 may be formed on the disc-shaped flange 12 on the side close to the outer end 112 of the bottle head main body 11, and the second locking groove 122 may be a continuous ring shape in the circumferential direction or may be discontinuous; one or more second card slots 122 may be opened in the radial direction. The outer cover 22 has a second protrusion (in the figure, the second protrusion overlaps the second locking groove 122) that engages with the second locking groove 122. Thereby, the contact area of the plastic liner 2 with the disc-shaped flange 12 is further increased, and the sealing performance and the reliability of the connection are improved. The second engaging groove 122 may be a dovetail groove, and the second protrusion is a dovetail protrusion engaged with the second engaging groove 122, so that the second protrusion is difficult to be pulled out from the second engaging groove 122, thereby further improving the connection reliability between the outer cladding portion 22 and the disc-shaped flange 12 and preventing relative movement or separation.

In order to further improve the reliability of the connection between the outer cladding 22 and the disc-shaped flange 12, the wrapping layer 4 may be provided on the outer side of the plastic liner 2, and the outer cladding 22 may be clamped between the disc-shaped flange 12 and the wrapping layer 4. The wrapping layer 4 tightly wraps the outside of the outside wrapping portion 22, and applies pressure to the outside wrapping portion 22 so that the outside wrapping portion 22 tightly fits to one side of the disc-shaped flange 12. The outer cladding part 22 of the plastic inner container 2 is difficult to move or tilt axially relative to the disc-shaped flange 12, so that the second protrusion on the outer cladding part 22 cannot be pulled out of the second clamping groove 122 of the disc-shaped flange 12, and slippage or separation between the outer cladding part 22 and the disc-shaped flange 12 is effectively prevented. In order to further secure the pressing action of the wrapping layer 4 on the outer wrapping 22, an insertion groove 114 may be provided on the outer periphery of the head main body 11, and the wrapping layer 4 is inserted into the insertion groove 114, so that the starting point of the bonding of the wrapping layer 4 to the head main body 11 is fixed relative to the head main body 11, thereby securing that the wrapping layer 4 does not collapse and lose the pressing action on the outer wrapping 22.

In one embodiment, as shown in fig. 4, the disc-shaped flange 12 is provided with a plurality of through holes 123, the through holes 123 can be circumferentially arranged on the disc-shaped flange 12, and the through holes 123 are filled with the plastic material of the plastic liner 2, so as to ensure that the plastic liner 2 cannot be separated from the disc-shaped flange 12 due to deformation. Specifically, by the injection molding method in the above embodiment, the injection molding material of the plastic liner 2 flows into and fills the through hole 123, and after condensation, the plastic material of the plastic liner 2 naturally fills the through hole 123 to form a cylinder. In order to further increase the relative movement resistance of the plastic inner container 2 with respect to the through hole 123, the through hole 123 may be designed as a stepped shaft, and the stepped shaft may be specifically formed by coaxially connecting two holes with different diameters, and the hole with the larger diameter is closer to the outer end 112. Through the arrangement, the contact area between the plastic inner container 2 and the through hole 123 can be effectively increased, so that the relative movement resistance between the through hole 123 and the plastic inner container 2 is increased, the cylinder breakage or other part breakage caused by the continuous movement of the plastic inner container 2 relative to the disc-shaped flange 12 is prevented, and the safety is improved.

While the present invention has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.