KR-102962661-B1 - PRESSURE VESSEL AND MANUFACTURING METHOD THEREOF

KR102962661B1KR 102962661 B1KR102962661 B1KR 102962661B1KR-102962661-B1

Abstract

The present invention relates to a pressure vessel and a method for manufacturing the same, and provides a pressure vessel comprising: a liner having an inlet formed on one side; a boss coupled to the inlet of the liner; a composite layer arranged to surround the outer surface of the liner and extending to the outer surface of the boss; and at least one ring member inserted and coupled to the outer surface of the boss to fill the gap formed between the outer surface of the boss and the side end of the composite layer.

Inventors

김대근
이교민
고영관
김원영
강인보
김예은

Assignees

롯데케미칼 주식회사

Dates

Publication Date: 20260508
Application Date: 20201120

Claims (7)

A liner with an injection port formed on one side; A boss coupled to the injection port of the above-mentioned liner; A composite layer disposed to wrap around the outer surface of the liner and extending to the outer surface of the boss; and It includes at least one ring member that is inserted and coupled to the outer surface of the boss to fill the gap formed between the outer surface of the boss and the side end of the composite layer. A pressure vessel characterized by the above-mentioned ring member being tapered, with the outer surface widening towards the top.
In paragraph 1, A pressure vessel characterized in that a screw thread is formed on the inner surface of the ring member, and a corresponding screw thread is formed on the outer surface of the outer boss of the boss.
In paragraph 1, A pressure vessel characterized by having a plurality of protrusions formed along the circumference on the inner surface of the ring member, and a fixing groove formed on the outer surface of the outer boss of the boss to exert a bonding force with the protrusions.
In any one of paragraphs 1 through 3, A pressure vessel characterized in that the above ring member is formed as a tapered cylinder with an enlarged outer diameter.
In paragraph 1, The above composite layer has a plurality of layers, and A pressure vessel characterized in that a plurality of ring members are inserted corresponding to the height of the side end of the composite layer, and are sequentially inserted into the outer surface of the boss corresponding to the formation of the spaced-out space.
A method for manufacturing a pressure vessel comprising a liner, a boss coupled to an inlet of the liner, and a composite layer disposed to surround the outer surface of the liner and extending to the outer surface of the boss, wherein A step of forming a composite layer by winding a composite material onto the outer surface of the above liner; A step of attaching at least one ring member to the outer surface of the boss to fill the gap formed between the outer surface of the boss and the side end of the composite layer while performing the winding process of the composite layer; and The final winding process includes a step of compressing and covering the upper portion of the ring member with a composite layer; A method for manufacturing a pressure vessel characterized in that the above-mentioned ring member is tapered, with the outer surface widening towards the top.
In paragraph 6, The above composite layer is formed in multiple layers, and multiple ring members are inserted, A method for manufacturing a pressure vessel characterized by sequentially inserting a plurality of ring members corresponding to the side height of the composite layer formed sequentially.

Description

Pressure vessel and manufacturing method thereof The present invention relates to a pressure vessel and a method for manufacturing the same, and more specifically, to a pressure vessel and a method for manufacturing the same that can improve the interfacial bonding performance between a boss and a composite layer and the structural rigidity of a boss of a pressure vessel used for storing high-pressure gas, etc. Generally, natural gas vehicles or hydrogen fuel cell vehicles are equipped with pressure vessels that compress gaseous fuel to high pressure for storage. The pressure vessel includes a plastic liner for weight reduction, a composite layer made of thermosetting fiber composite material surrounding the outer shell of the liner, and a boss, which is a metallic nozzle for the inflow and outflow of fuel. The material for lightweighting the liner is made of plastic materials such as polyolefin resins and polyamide resins, the composite layer is manufactured using a filament winding process that wraps the surface of the liner with a composite material composed of carbon fibers or glass fibers to maintain strength, and the boss is made of metallic material to ensure a robust connection with a regulator or valve made of metal. In such conventional pressure vessels, an inlet is formed that allows gaseous fuels such as LPG, CNG, and hydrogen gas to enter and exit, and a metallic boss is inserted into this inlet. However, since the plastic liner and the metallic boss are made of different materials, there is a problem with the bonding, and there is always a risk of internal gas leakage due to repetitive fatigue loading during continuous fuel filling. Therefore, to prevent gas leakage between the plastic liner and the metallic boss, a high-strength metal material must be applied to the boss, and the improvement of the interfacial bonding between the plastic liner and the metallic boss determines the product's performance. Conventionally, only simple structural bonding was applied to the interface between the plastic liner and the metallic boss, which presented a problem where the risk of leakage through the interface persisted during prolonged charging and discharging. In addition, conventional pressure vessels had weak interfacial adhesion between the metallic boss and the composite layer due to the difference in materials. Consequently, there was a problem in that severe deformation and damage were induced in the boss during tests where direct impact was applied to the boss, such as drop tests. FIG. 1 is a perspective view showing a pressure vessel according to the present invention. FIGS. 2 and FIGS. 3 are perspective views showing a ring member of a pressure vessel according to the present invention. FIG. 4 is a perspective view showing the application state of one ring member to a pressure vessel according to the present invention. Figure 5 is a cross-sectional view of Figure 4. FIG. 6 is a perspective view showing the application state of three ring members to a pressure vessel according to the present invention. FIG. 7 is a drawing sequentially illustrating the process of applying a ring member in a pressure vessel according to the present invention. The present invention is susceptible to various modifications and may take various forms, and embodiments are to be described in detail in the text. However, this is not intended to limit the invention to the specific disclosed forms, and it should be understood that the invention includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention. Similar reference numerals have been used for similar components in the description of each figure. The above terms are used solely for the purpose of distinguishing one component from another. The terms used in this application are used merely to describe specific embodiments and are not intended to limit the invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. FIG. 1 is a perspective view showing a pressure vessel according to the present invention, shown with the composite layer excluded. FIG. 2 and FIG. 3 are perspective views showing a ring member of a pressure vessel according to the present invention, FIG. 4 is a perspective view showing the application state of one ring member to a pressure vessel according to the present invention, FIG. 5 is a cross-sectional view of FIG. 4, and FIG. 6 is a perspective view showing the application state of three ring members to a pressure vessel according to the present invention. Referring to the attached drawings, a pressure vessel (100) according to an embodiment of the present invention comprises a liner (110) that is formed of a hollow cylindrical cylinder and maintains the airtightness of gaseous fuel. High-pressure gaseous fuel is stored in the