CN108953985B - High-pressure composite container with sealing structure - Google Patents

Abstract

The invention discloses a high-pressure composite container with a sealing structure, which comprises a shell, a supporting lining, an end head, a bottleneck valve and a reinforcing layer, wherein the shell is provided with a sealing ring; wherein, a bottle mouth is arranged on the shell; the support lining is provided with a clamping groove which is clamped on the inner wall of the bottle mouth; the end is provided with an installation groove, the supporting lining is fixedly arranged in the installation groove, and the inner side wall of the installation groove is abutted with the outer wall of the bottle mouth; the bottle mouth valve is fixedly arranged in the end head in a penetrating way; the reinforcing layer is wrapped on the shell. According to the high-pressure composite container with the sealing structure, the bottle opening can be wrapped in the clamping groove through the matching of the supporting lining and the end head, namely, the inner wall and the outer wall of the bottle opening are simultaneously extruded and sealed, so that a sealing interface for the bottle opening is increased, a leakage path is prolonged, leakage and permeation of high-pressure gas in the container are prevented, the structural strength of the bottle opening is enhanced, and the bottle opening is prevented from being deformed due to the change of pressure in the container.

Description

High-pressure composite container with sealing structure

Technical Field

The invention relates to a composite container, in particular to a high-pressure composite container with a sealing structure.

Background

Most taxis are modified with Compressed Natural Gas (CNG) to replace fuel oil, and the working pressure of a common CNG high-pressure gas cylinder is 20 MPa; some vehicle manufacturers have introduced CNG or CNG and fuel hybrid vehicles, such as audi, general purpose, etc. The automobile adopting the hydrogen medium battery is also the current hotspot, the working pressure of the hydrogen storage high-pressure gas cylinder is generally 35MPa and 70MPa, and an IV-shaped cylinder (a high-pressure plastic inner container composite container) with 70MPa is the current heating point. In addition to vehicles, high-pressure gas cylinders are also fully applied in other fields, for example, a plastic liner composite container (working pressure 2MPa) is adopted for part of liquefied petroleum gas in Europe. A large number of high-pressure containers are widely used in daily life, and the traditional pure metal or metal lining composite container has the problem of heavy weight and is difficult to transport; and the higher the storage pressure is, the more complicated the production process of the metal plastic liner is, the higher the cost is, and the risk of being corroded by high-pressure gas also exists. In order to meet the requirement of light weight, a high-pressure plastic liner composite container is produced, and due to the characteristics of plastics, the product has excellent performances of corrosion resistance, fatigue resistance, light weight and the like. Compared with a pure metal or metal lining composite container, the tightness of the high-pressure plastic liner composite container is guaranteed more rigorously, and the main reason is that the plastic liner shell and the metal end are made of different materials, so that the connection between the plastic liner and the metal end is loosened in the repeated use process, and the sealing performance is reduced.

In view of the current situation, the connection between the metal end and the plastic inner container is a hot point and a difficult point for research. Fig. 1 is a composite container of a high-pressure plastic liner in the prior art, which comprises a metal end 1, a plastic liner 2 and a reinforcing layer 3, wherein the metal end 1 is installed on the plastic liner 2, and then the plastic liner is wound and wrapped by the reinforcing layer 3. Fig. 2 is a view showing a sealing structure in the high pressure plastic liner composite container shown in fig. 1, and as shown in fig. 1 and 2, the large-area contact of the metal end 1 with the plastic liner 2 is technically impossible and expensive even if feasible; the sealing structure does not consider the limit on the axes of the metal end 1 and the plastic inner container 2; the structure does not consider the pressurization that the internal pressure of the plastic inner container 2 is changed continuously when winding, which can cause the joint of the metal end 1 and the plastic inner container 2 to generate a gap to cause leakage; the structure does not consider the limit of a bottle opening when bearing the installation torque, and the bonding strength of the metal end 1 and the reinforcing layer 3 is reduced after the installation; the escape path P of the compressed gas in the structure is short, so that the risk of escape of the compressed gas can be increased, and particularly, the compressed gas is small molecular gas CNG, hydrogen, helium and the like. Therefore, it is necessary to develop a sealing structure capable of solving the above problems.

Disclosure of Invention

The invention aims to provide a high-pressure composite container with a sealing structure, which is used for solving the problems in the prior art, preventing leakage and permeation of high-pressure gas medium in the high-pressure composite container and ensuring the sealing property of the container.

The invention provides a high-pressure composite container with a sealing structure, which comprises:

the bottle opening is arranged on the shell;

the supporting lining is provided with a clamping groove, and the clamping groove is clamped on the inner wall of the bottle opening;

the end head is provided with an installation groove, the support lining is fixedly arranged in the installation groove, and the inner side wall of the installation groove is abutted with the outer wall of the bottle mouth;

the bottleneck valve is fixedly arranged in the end head in a penetrating way;

and the reinforcing layer is wrapped on the shell.

The high-pressure composite container with the sealing structure as described above, wherein preferably, the support lining includes a vertical section and a horizontal section perpendicular to each other, an outer diameter of the horizontal section is larger than an outer diameter of the vertical section, a boss is disposed on the vertical section, and the clamping groove is formed between the boss and the horizontal section.

The high-pressure composite container with the sealing structure as described above, wherein preferably, the horizontal section is provided with a notch.

The high-pressure composite container with the sealing structure as described above, wherein preferably, the mounting groove includes a first groove and a second groove, an inner thread is provided on an inner side wall of the first groove, and the support liner is fixedly connected with the first groove through the inner thread;

and after the support lining is fixedly connected with the first groove, the inner side wall of the second groove is extruded on the outer wall of the bottle mouth.

The high-pressure composite container with the sealing structure is characterized in that the end head comprises a fixing part, a fixing hole for penetrating the bottleneck valve is formed in the fixing part, a first limiting step is arranged on the inner wall of the fixing hole, and the first limiting step is abutted with one end, far away from the horizontal section, of the support lining;

and a second limit step is formed between the first groove and the second groove and is abutted against the boss.

The high-pressure composite container with the sealing structure as described above, preferably, a positioning section is provided on the fixing portion, and two or more tangent planes are provided on a side wall of the positioning section, and an obtuse angle is formed between two adjacent tangent planes.

The high-pressure composite container with the sealing structure as described above, wherein preferably, the end head further includes a transition portion, an outer diameter of the transition portion is larger than an outer diameter of the fixing portion, and an arc-shaped pressure-resistant bearing surface is provided on the transition portion;

the fixed part and the transition part are integrally formed.

The high-pressure composite container with the sealing structure preferably further comprises a first sealing ring and a second sealing ring, wherein a first sealing groove is formed at the bottom of the transition part, and the first sealing ring is arranged in the first sealing groove;

and a second sealing groove is formed in the inner side wall of the second groove, and the second sealing ring is arranged in the second sealing groove.

The high-pressure composite container with the sealing structure as described above, wherein preferably, the fixing portion includes a fixing section and a guide section, and the first limit step is formed between the guide section and the first groove;

the high-pressure composite container with the sealing structure further comprises a third sealing ring, wherein a third sealing groove is formed in the inner side wall of the guide section, and the third sealing ring is arranged in the third sealing groove;

the high-pressure composite container with the sealing structure further comprises a fourth sealing ring, a fourth sealing groove is formed in the end face, far away from the guide section, of the fixing section, and the fourth sealing ring is arranged in the fourth sealing groove.

The high-pressure composite container having a sealed structure as described above, wherein preferably, the casing has a layered structure including at least two layers or more;

the shell is made of one or a combination of more than two of PA, PE, polyester, PP, POM and EVOH.

According to the high-pressure composite container with the sealing structure, the bottle opening can be wrapped in the clamping groove through the matching of the supporting lining and the end head, namely, the inner wall and the outer wall of the bottle opening are simultaneously extruded and sealed, so that a sealing interface for the bottle opening is increased, a leakage path is prolonged, leakage and permeation of high-pressure gas in the container are prevented, the structural strength of the bottle opening is enhanced, and the bottle opening is prevented from being deformed due to the change of pressure in the container.

Drawings

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

FIG. 1 is a composite container with a high pressure plastic liner in the prior art;

FIG. 2 is a sealing structure of the high pressure plastic liner composite container shown in FIG. 1;

FIG. 3 is a schematic structural diagram of a high pressure composite container with a sealing structure provided by an embodiment of the present invention;

FIG. 4 is a cross-sectional view of a high pressure composite container having a sealing structure provided by an embodiment of the present invention;

FIG. 5 is an enlarged view of a portion of FIG. 4;

FIG. 6 is a cross-sectional view of FIG. 5 with the finish valve removed;

FIG. 7 is a schematic view of a support liner;

FIG. 8 is a cross-sectional view of the support liner;

FIG. 9 is a schematic view of the tip;

fig. 10 is a cross-sectional view of the tip.

Description of reference numerals:

1-metal end 2-plastic inner container 3-reinforced layer

4-leakage path

100-end head 110-fixing part 111-fixing section

112-guide section 120-transition 130-fixing hole

140-positioning structure 150-section 160-mounting groove

161-first groove 162-second groove 163-first limit step

164-second limit step 200-support liner 210-vertical section

220-horizontal segment 230-boss 240-gap

250-card slot 260-torsion-resistant boss 300-shell

310-neck opening 400-neck opening valve 500-reinforced layer

a-first sealing ring b-second sealing ring c-third sealing ring

d-fourth sealing ring

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.

Referring to fig. 3 to 6, an embodiment of the present invention provides a high pressure composite container with a sealing structure, which includes a shell 300, a support liner 200, a head 100, a finish valve 400, and a reinforcing layer 500; wherein, a bottle mouth 310 is arranged on the shell 300; the support lining 200 is provided with a clamping groove 250, and the clamping groove 250 is clamped on the inner wall of the bottle mouth 310; the end head 100 is provided with a mounting groove 160, the support lining 200 is fixedly arranged in the mounting groove 160, and the inner side wall of the mounting groove 160 is abutted against the outer wall of the bottle mouth 310; the bottleneck valve 400 is fixedly arranged in the end head 100 in a penetrating way; the reinforcing layer 500 is wrapped on the housing 300, wherein the reinforcing layer may be made of a fiber composite material.

The supporting lining 200 can be clamped on the inner wall of the bottle opening 310 through the clamping groove 250, and the end head 100 can be clamped on the outer wall of the bottle opening 310 through the mounting groove 160, so that the whole bottle opening 310 is wrapped, gas leakage is effectively prevented, and sealing performance is guaranteed; in addition, by the cooperation of support liner 200 and tip 100, the structural strength at the mouth 310 is enhanced, preventing the mouth 310 from deforming due to changes in pressure within the container. The material of the tip 100 and the support lining 200 may be metal, specifically, aluminum alloy or stainless steel.

The housing 300 is made of plastic and is obtained by a blow molding or rotational molding process. According to the permeation characteristics of different molecular weights for bearing high-pressure gas, the shell 300 with a layered structure may be adopted to prevent permeation of small molecule gas such as hydrogen molecules and ensure sealing performance when storing different gases, in this embodiment, the shell 300 may be a layered structure including at least two layers. The material of the case 300 may be one or a combination of two or more of PA, PE, polyester, PP, POM, and EVOH. That is, the layered structure of each layer may be a single material or a combination of two or more materials.

Specifically, as shown in fig. 5, 7 and 8, the support liner 200 includes a vertical section 210 and a horizontal section 220 perpendicular to each other, an outer diameter of the horizontal section 220 is larger than an outer diameter of the vertical section 210, a boss 230 is disposed on the vertical section 210, and a clamping groove 250 is formed between the boss 230 and the horizontal section 220; a straight section is arranged on the shell 300, the bottle mouth 310 is arranged on the straight section, and the bottle mouth 310 extends in a direction perpendicular to the straight section; bottleneck 310 can be blocked between boss 230 and horizontal segment 220 from this, and horizontal segment 220 can the butt on the straight section of casing 300 to realized the parcel to bottleneck 310 inboard, end 100 can wrap up the lateral wall of bottleneck 310 simultaneously, thereby realized the parcel to the wall everywhere on bottleneck 310, guaranteed the leakproofness. In addition, the horizontal section 220 may extend a leakage path of the gas, further preventing the gas from leaking.

It will be appreciated that, since the mouth 310 is provided on the plastic shell 300 and the mouth 310 are generally integrally formed by blow molding or rotational molding, relative rotation between the support liner 200 and the shell 300 is facilitated when the shell 300 is assembled with the support liner 200 after molding. In order to avoid this problem, in this embodiment, as shown in fig. 7 and 8, a notch 240 may be provided on the horizontal segment 220, and when the raw material of the shell 300 is extruded by the die, after the molten raw material is extruded into the notch 240, a force resisting circumferential relative rotation may be formed between the shell 300 and the supporting lining 200, so that the shell 300 and the supporting lining 200 may not rotate circumferentially separately, thereby facilitating the subsequent precision machining of the shell 300. Wherein, on opening 240 can set up the surface or the edge of horizontal segment 220, in order to guarantee closely laminating in order to realize sealedly between horizontal segment 220 upper surface and the casing 300, opening 240 sets up the marginal position at horizontal segment 220, and opening 240 is the arc, has evenly arranged a plurality of openings 240 in horizontal segment 220's circumference simultaneously.

In order to further prevent the rotation between the housing 300 and the supporting liner 200, as shown in fig. 7, an anti-torsion boss 260 may be disposed on the horizontal section 220, and more than two tangential planes are disposed on the anti-torsion boss 260 in the circumferential direction, and an obtuse angle is formed between two adjacent tangential planes, so that the support in each direction can be realized through the tangential planes, thereby effectively preventing the rotation between the housing 300 and the supporting liner 200.

Specifically, as shown in fig. 9 and 10, the mounting groove 160 includes a first groove 161 and a second groove 162, an inner sidewall of the first groove 161 is provided with an internal thread, and the support liner 200 is fixedly connected to the first groove 161 by the internal thread; when the support liner 200 is fixedly connected to the first groove 161, the inner sidewall of the second groove 162 is pressed against the outer wall of the bottle mouth 310; therefore, the bottle mouth 310 is extruded by the fastening force between the supporting lining 200 and the end head 100, the tight fit of the sealing interface among the end head 100, the supporting lining 200 and the bottle mouth 310 is ensured, and the sealing performance is ensured.

As shown in fig. 10, the tip 100 includes a fixing portion 110, a fixing hole 130 for passing through the bottleneck valve 400 is disposed on the fixing portion 110, a first limit step 163 is disposed on an inner wall of the fixing hole 130, and the first limit step 163 abuts against one end of the support liner 200 far away from the horizontal section 220; a second limit step 164 is formed between the first groove 161 and the second groove 162, and the second limit step 164 abuts the boss 230. Therefore, the installation limit of the tip 100 in the axial direction is realized through the arrangement of the first limit step 163 and the second limit step 164.

It should be noted that the fiber composite material is generally wound on the outer surface of the plastic shell 300, and if the surface of the plastic shell 300 or the tip 100 is a smooth circular arc surface, the relative rotation between the reinforcing layer 500 and the tip 100 will be caused. In order to avoid this problem, in this embodiment, as shown in fig. 9, the fixing portion 110 may be provided with a positioning section, a side wall of the positioning section may be provided with more than two cut surfaces 150, and an obtuse angle is formed between two adjacent cut surfaces 150; therefore, in the process of winding the plastic shell 300 and the end head 100 by using the fiber composite material, the force resisting the circumferential relative rotation can be formed between the end head 100 and the reinforcing layer 500 through the tangent plane 150, so that the end head 100 and the reinforcing layer 500 cannot rotate in a circumferential separation manner, and the subsequent high-torque assembly of the bottleneck valve 400 is facilitated.

Further, as shown in fig. 5, 6, 9 and 10, the tip 100 further includes a transition portion 120, an outer diameter of the transition portion 120 is greater than an outer diameter of the fixing portion 110, and an arc-shaped pressure-resistant bearing surface is disposed on the transition portion 120; the fixing portion 110 and the transition portion 120 are integrally formed. The lower surface of the transition part 120 can be tightly attached to the plastic shell 300, and the arc-shaped pressure-resistant bearing surface can be in butt joint with the arc surface on the plastic shell 300 to form complete radian transition, so that the reinforcing layer 500 can be tightly attached to the plastic shell 300, the compactness of the structure is ensured, and meanwhile, the end head 100 and the support lining 200 can bear higher internal pressure of a container, and the damages such as deformation and flying out of the container are avoided.

Further, as shown in fig. 5 and 6, the high-pressure composite container further includes a first sealing ring a and a second sealing ring b, a first sealing groove is disposed at the bottom of the transition portion 120, and the first sealing ring a is disposed in the first sealing groove; a second sealing groove is formed in the inner sidewall of the second groove 162, and a second sealing ring b is disposed in the second sealing groove. Gas permeation from the sealing interface between tip 100 and plastic housing 300 may be further prevented by the first and second seal grooves.

Further, as shown in fig. 5, the fixing portion 110 includes a fixing section 111 and a guide section 112, and a first limit step 163 is formed between the guide section 112 and the first groove 161; the high-pressure composite container also comprises a third sealing ring c, wherein a third sealing groove is formed in the inner side wall of the guide section 112, and the third sealing ring c is arranged in the third sealing groove; the high-pressure composite container further comprises a fourth sealing ring d, a fourth sealing groove is formed in the end face, far away from the guide section 112, of the fixing section 111, and the fourth sealing ring d is arranged in the fourth sealing groove. When the threaded connection of the end head 100 and the bottleneck valve 400 is tightened, the third sealing ring c and the fourth sealing ring d are effectively compressed, so that an effective sealing interface for preventing gas medium leakage and permeation is formed, and excellent sealing performance between the end head 100 and the bottleneck valve 400 is formed.

Wherein, the diameter of each sealing ring can be 2 mm-4 mm, and the compression amount can be 20% -30%; the material of the sealing ring may be FKM, EPDM, FVMQ, PTFE, silicone resin, or other material having hydrogen gas corrosion resistance and low temperature resistance, and preferably, the material of the sealing ring is one of FKM, EPDM, and PTFE.

Further, as shown in fig. 9, in order to facilitate the positioning of the bottleneck valve 400 between the installation and the head 100, the head 100 may be provided with a positioning structure 140; the positioning structure 140 may be a concave pit, a slot 250, or the like, and in this embodiment, the positioning structure 140 is a notch 240 disposed on an edge of the end face of the tip 100.

According to the high-pressure composite container with the sealing structure, the bottle opening can be wrapped in the clamping groove through the matching of the supporting lining and the end head, namely, the inner wall and the outer wall of the bottle opening are simultaneously extruded and sealed, so that a sealing interface for the bottle opening is increased, a leakage path is prolonged, leakage and permeation of high-pressure gas in the container are prevented, the structural strength of the bottle opening is enhanced, and the bottle opening is prevented from being deformed due to the change of pressure in the container.

The construction, features and functions of the present invention are described in detail in the embodiments illustrated in the drawings, which are only preferred embodiments of the present invention, but the present invention is not limited by the drawings, and all equivalent embodiments modified or changed according to the idea of the present invention should fall within the protection scope of the present invention without departing from the spirit of the present invention covered by the description and the drawings.

Claims (7)

1. A high pressure composite container with a sealed structure, comprising:

the bottle opening is arranged on the shell;

the supporting lining is provided with a clamping groove, and the clamping groove is clamped on the inner wall of the bottle opening;

the end head is provided with an installation groove, the support lining is fixedly arranged in the installation groove, and the inner side wall of the installation groove is abutted with the outer wall of the bottle mouth;

the bottleneck valve is fixedly arranged in the end head in a penetrating way;

the reinforcing layer is wrapped on the shell;

the supporting lining comprises a vertical section and a horizontal section which are perpendicular to each other, the outer diameter of the horizontal section is larger than that of the vertical section, a boss is arranged on the vertical section, and the clamping groove is formed between the boss and the horizontal section;

the horizontal section is provided with a notch;

the end head comprises a fixing part and a transition part, and the fixing part and the transition part are integrally formed;

the sealing structure further comprises a first sealing ring and a second sealing ring, wherein a first sealing groove is formed in the bottom of the transition part, and the first sealing ring is arranged in the first sealing groove; the mounting groove comprises a first groove and a second groove;

and a second sealing groove is formed in the inner side wall of the second groove, and the second sealing ring is arranged in the second sealing groove.

2. The high-pressure composite container with a sealing structure according to claim 1, wherein an inner side wall of the first groove is provided with an internal thread, and the support liner is fixedly connected with the first groove through the internal thread;

and after the support lining is fixedly connected with the first groove, the inner side wall of the second groove is extruded on the outer wall of the bottle mouth.

3. The high-pressure composite container with the sealing structure according to claim 2, wherein the fixing portion is provided with a fixing hole for penetrating the bottleneck valve, the inner wall of the fixing hole is provided with a first limiting step, and the first limiting step is abutted with one end of the support lining, which is far away from the horizontal section;

and a second limit step is formed between the first groove and the second groove and is abutted against the boss.

4. The high-pressure composite container with a sealing structure according to claim 3, wherein a positioning section is provided on the fixing portion, and more than two cut surfaces are provided on a side wall of the positioning section, and an obtuse angle is formed between two adjacent cut surfaces.

5. The high-pressure composite container with a sealing structure according to claim 3, wherein the transition portion has an outer diameter larger than that of the fixing portion, and an arc-shaped pressure-resistant bearing surface is provided on the transition portion.

6. The high-pressure composite container with a sealing structure according to claim 3, wherein the fixing portion includes a fixing section and a guide section, the guide section and the first groove forming the first stopper step therebetween;

the high-pressure composite container with the sealing structure further comprises a third sealing ring, wherein a third sealing groove is formed in the inner side wall of the guide section, and the third sealing ring is arranged in the third sealing groove;

the high-pressure composite container with the sealing structure further comprises a fourth sealing ring, a fourth sealing groove is formed in the end face, far away from the guide section, of the fixing section, and the fourth sealing ring is arranged in the fourth sealing groove.

7. The high-pressure composite container with a sealing structure according to claim 1, wherein the casing has a layered structure including at least two layers or more;

the shell is made of one or a combination of more than two of PA, PE, polyester, PP, POM and EVOH.

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