A method for forming a liner structure of a gas-charged pressure vessel and the liner structure

Abstract

The present application relates to a method for forming a liner structure of a gas-filled pressure vessel, comprising the following steps: providing a composite material blank, which is composed of a first high-density thermoplastic, a second high-density thermoplastic, a first adhesive layer, a gas barrier layer, a second adhesive layer, and a third high-density thermoplastic in sequence; providing a liner structure forming mold, which is formed by combining two left-right symmetrical mold halves to form a cavity; placing the composite material blank in the cavity, and blow molding the cavity to melt and bond the composite material blank through the left-right symmetrical mold halves, thereby forming a hollow liner structure; and generating a joint line at the mold joint of the liner structure, wherein the liner structure has a W-shaped cross section with the joint line as the center point.

Description

[0001] Technical Field: This invention relates to a method for molding the inner liner structure of a pressure vessel for loading gas and the inner liner structure thereof, particularly the inner liner structure of a pressure vessel for loading gas made of a composite material preform and the molding method thereof. Background technology:

[0002] Liquefied petroleum gas (LPG) is an important energy source widely used in daily life. It is not only a driving force for economic development but also an indispensable material for people's lives. Currently, the main energy sources used by domestic households are natural gas and LPG. Because the main components of LPG are propane and butane, it produces more heat energy when burned than natural gas (methane and ethane). Therefore, commercial establishments (such as snack stalls and restaurants) almost always use LPG as fuel.

[0003] On the other hand, since the container is a pressurized steel cylinder and exists in the daily lives of ordinary people, its safe use is a very important issue.

[0004] Generally speaking, the airtightness of the outlet valve of a pressure vessel for composite gas is of utmost concern. However, even if the airtightness of the outlet valve is quite good, there will still be volatilization problems. The key is that the inner liner structure itself will also have slight leakage or volatilization problems. Therefore, how to develop an inner liner structure with better sealing effect is a problem that the industry urgently needs to solve. Summary of the Invention:

[0005] In view of the shortcomings of the prior art, the present invention provides a method for forming the inner liner structure of a gas-filled pressure vessel, comprising, in sequence:

[0006] A composite material preform is provided, the composite material preform being sequentially formed by stacking a first high-density thermoplastic plastic, a second high-density thermoplastic plastic, a first adhesive layer, a gas barrier layer, a second adhesive layer, and a third high-density thermoplastic plastic;

[0007] A liner structure forming mold is provided, wherein the liner structure forming mold is formed by joining two symmetrical molds to form a cavity;

[0008] The composite material blank is placed in the cavity, the cavity is blow-formed, and the composite material blank is melt-bonded through the left and right symmetrical molds to form a hollow inner liner structure.

[0009] The feature is that a seam line is generated at the membrane joint of the inner liner structure, wherein the inner liner structure with the seam line as the center point has a W-shaped cross-section.

[0010] The method for forming the inner liner structure of the gas-carrying pressure vessel includes forming a protrusion at the center point of the joint line and forming a symmetrical concave portion on both sides of the protrusion.

[0011] The method for forming the inner liner structure of the gas-carrying pressure vessel includes forming a protrusion at the center point of the joint line and forming a symmetrical concave portion on both sides of the protrusion.

[0012] The method for forming the inner liner structure of the gas-carrying pressure vessel includes forming a protrusion at the center point of the joint line and forming a symmetrical concave portion on both sides of the protrusion.

[0013] The method for forming the inner liner structure of the gas-carrying pressure vessel includes forming a protrusion at the center point of the joint line and forming a symmetrical concave portion on both sides of the protrusion.

[0014] The method for forming the inner liner structure of the gas-carrying pressure vessel includes forming a protrusion at the center point of the joint line and forming a symmetrical concave portion on both sides of the protrusion.

[0015] In addition, the application further provides an inner liner structure of a gas-carrying pressure vessel formed by the forming method.

[0016] The method for forming the inner liner structure of the gas-carrying pressure vessel includes forming a protrusion at the center point of the joint line and forming a symmetrical concave portion on both sides of the protrusion.

[0017] The method for forming the inner liner structure of the gas-carrying pressure vessel includes forming a protrusion at the center point of the joint line and forming a symmetrical concave portion on both sides of the protrusion.

[0018] The method for forming the inner liner structure of the gas-carrying pressure vessel includes forming a protrusion at the center point of the joint line and forming a symmetrical concave portion on both sides of the protrusion. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The application provides a method for forming an inner liner structure of a gas-carrying pressure vessel.

[0020] Figure 2 The application provides an inner liner structure of a gas-carrying pressure vessel.

[0021] Figure 3 A schematic view of a top surface of the inner liner structure of the present application;

[0022] Figure 4 A schematic view of a partial cross-sectional view of the inner liner structure of the gas-filled pressure vessel of the present application;

[0023] Figure 5 A schematic view of a partial cross-sectional view of the inner liner structure of the gas-filled pressure vessel of the present application.

[0024] Reference Signs:

[0025] Composite material embryo 10

[0026] First high-density thermoplastic plastic 101

[0027] Second high-density thermoplastic plastic 102

[0028] First adhesive layer 103

[0029] Gas barrier layer 104

[0030] Second adhesive layer 105

[0031] Third high-density thermoplastic plastic 106

[0032] Inner liner structure forming mold 20

[0033] Left-right symmetrical molds 21, 22

[0034] Cavity 23

[0035] Inner liner structure 100

[0036] Film joint 30

[0037] Seam line 31

[0038] Protrusion 32

[0039] Indentation 33

[0040] Joint thickness of protrusion A1

[0041] Thickness of indentation A2

[0042] Joint thickness of gas barrier layer B1

[0043] Thickness of gas barrier layer B2 DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described in detail below in combination with specific embodiments.

[0045] It should be noted that unless otherwise defined, technical and scientific terms used in one or more embodiments of the specification have the meanings commonly understood by one of ordinary skill in the art in the field of the disclosure. The words "first", "second", and similar terms of distinction do not necessarily imply any actual order, quantity, or importance, but are used to distinguish one element from another. The words "include" or "contain" and similar terms mean that the elements or objects listed before the words encompass the elements or objects listed after the words and their equivalents, and do not exclude other elements or objects. The words "connected" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The words "up", "down", "left", "right", and the like are only used to represent relative positional relationships, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0046] Please refer to Figure 1 With Figure 2 , Figure 1 is a process of forming an inner liner structure of a gas-filled pressure vessel, Figure 2 is a partial cross-sectional view of the inner liner structure forming mold and the inner liner structure, and the forming method comprises the following steps:

[0047] A composite material blank 10 is provided, which is composed of a first high-density thermoplastic plastic 101, a second high-density thermoplastic plastic 102, a first adhesive layer 103, a gas barrier layer 104, a second adhesive layer 105, and a third high-density thermoplastic plastic 106.

[0048] An inner liner structure forming mold 20 is provided, which is formed by two left and right symmetrical molds 21, 22 to form a cavity 23 for blowing the inner liner;

[0049] The composite material blank 10 is placed in the cavity 23, and the cavity 23 is blow molded, and the composite material blank 10 is fused and joined through the left and right symmetrical molds 21, 22, and an inner liner structure 100 with a hollow is formed; characterized in that a seam line 31 is generated at the seam 30 of the inner liner structure 100, wherein the inner liner structure 100 with the seam line 31 as the center point has a W-shaped cross section.

[0050] Please refer to Figure 3 The top surface of the inner liner structure after demolding can be seen as the appearance of the seam line 31 at the seam 30.

[0051] Please continue to refer to Figure 2, the left-right symmetrical molds 21, 22 form a protruding portion 32 at the center of the seam line 31 and a pair of symmetrical concave portions 33 on both sides of the protruding portion after the fusion bonding of the composite material embryo 10 after the film combining, thereby forming a so-called W-shaped cross section. Accordingly, the design of the two left-right symmetrical molds 21, 22 also has a configuration corresponding to the protruding portion 32 and the concave portion 33, and the two composite material embryos 10 are pressed and cut to produce the joint 30 after being bonded.

[0052] Please refer to Figure 4 , the protruding portion 32 has a joint thickness A1 at the joint 30 that is greater than the thickness A2 of the concave portion 33.

[0053] Please refer to Figure 5 , in the protruding portion 32, the gas barrier layer 104 of the composite material embryo 10 is fused and bonded to each other at the joint 30, and the joint thickness B1 of the gas barrier layer 104 is greater than the thickness B2 of the gas barrier layer 104.

[0054] The material of the gas barrier layer 104 includes ethylene vinyl alcohol copolymer (EVOH).

[0055] The second high-density thermoplastic plastic 102 can be used high-density thermoplastic plastic or equivalent recycled material.

[0056] The first high-density thermoplastic plastic 101 and the third high-density thermoplastic plastic 106 are one or more selected from the group consisting of polyethylene (PE), polypropylene (PP), and polyamide (PA).

[0057] In addition, the present application further provides an inner container structure 100 of a gas-loaded pressure container, which is made by the above-mentioned molding method. Figures 2 to 5 The W-shaped cross section, the protruding portion 32 and the concave portion 33 are as described above, and will not be described again. The inner container structure 100 of the gas-loaded pressure container provided by the present application has a joint thickness A1 of the protruding portion 32 at the joint 30 that is greater than the thickness A2 of the concave portion 33, and in the protruding portion 32, the joint thickness B1 of the gas barrier layer 104 is greater than the thickness B2 of the gas barrier layer 104, so that the gas barrier layer 104 is not easy to be interrupted or faulted, and the sealing effect is good. Accordingly, the gas leakage rate of the pressure container can be greatly reduced, and the safety of the pressure container can be improved.

[0058] One or more embodiments of the specification are intended to encompass all such substitutions, modifications and variations as fall within the broad scope of the appended claims. Accordingly, any omission, modification, substitution, improvement, etc. made in the spirit and principle of one or more embodiments of the specification shall be included in the scope of protection of the present disclosure.

Claims

1. A method for forming a liner structure of a gas-charged pressure vessel, comprising sequentially: providing a composite blank, the composite blank being sequentially composed of a first high-density thermoplastic, a second high-density thermoplastic, a first adhesive layer, a gas barrier layer, a second adhesive layer, and a third high-density thermoplastic; providing a liner structure forming mold, the liner structure forming mold being formed into a cavity after two left-right symmetrical mold halves are combined; placing the composite blank in the cavity, blow molding the cavity, and fusing the composite blank via the left-right symmetrical mold halves to form a hollow liner structure; characterized in that generating a seam line at the combined halves of the liner structure, wherein the liner structure has a W-shaped cross-section with the seam line as a center point.

2. The method of claim 1, wherein the method further comprises: the center point of the seam line forms a protruding portion, and a pair of symmetrical concave portions are formed on both sides of the protruding portion.

3. The method of claim 2, wherein the method further comprises the step of: the thickness of the protruding portion at the combined halves is greater than the thickness of the concave portions. ​ 4. The method of claim 3, wherein the method further comprises the step of: in the protruding portion, the gas barrier layers of the composite blank are fused and combined with each other, and the combined thickness of the gas barrier layers is greater than the thickness of the gas barrier layers. ​ 5. The method of claim 4, wherein the method further comprises the step of: the material of the gas barrier layer comprises ethylene-vinyl alcohol copolymer. ​ 6. The method of claim 1, wherein the method further comprises: the first high-density thermoplastic and the third high-density thermoplastic are one or more selected from the group consisting of polyethylene (PE), polypropylene (PP), and polyamide (PA).

7. A liner structure of a gas-charged pressure vessel, formed by the method of any one of claims 1 to 6.

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