EP-4741702-A1 - PRESSURE VESSEL AND METHOD FOR MANUFACTURING PRESSURE VESSEL
Abstract
A pressure vessel according to the present invention comprises a hollow liner (2) having a pair of protruding portions (23A), (23B) that protrude in directions moving away from one other, a pair of mouthpieces (4A), (4B) that are connected to the pair of protruding portions (23A), (23B) by means of a fastening structure that involves rotation, and a fiber-reinforced resin layer (3) obtained by winding fibers around the outer peripheral surfaces of the liner (2) and the mouthpieces (4A), (4B). The pressure vessel is characterized in that the fastening directions in the connections between the pair of protruding portions (23A), (23B) and the mouthpieces (4A), (4B) are set to the directions in which the respective mouthpieces (4A), (4B) are fastened to the pair of protruding portions (23A), (23B) when the fibers are wound around the outer surface of the liner (2).
Inventors
- YOSHIOKA JUNYA
- IWASE WATARU
- FUKUDA KEIKO
- MASUDA NAOKI
- KAMIYA KEN
Assignees
- Yachiyo Industry Co., Ltd.
Dates
- Publication Date
- 20260513
- Application Date
- 20240830
Claims (3)
- A pressure vessel comprising: a hollow liner having a pair of projections projecting in directions away from each other; a pair of neck fittings connected to the pair of projections via a rotational fastening mechanism; and a fiber-reinforced resin layer formed by winding a fiber around outer circumferential surfaces of the liner and the neck fittings, wherein fastening directions in the connection between the pair of projections and the neck fittings are set to directions in which the neck fittings are respectively fastened to the pair of projections in an operation of winding the fiber around an outer surface of the liner.
- The pressure vessel according to claim 1, wherein the fastening mechanism between the pair of projections and the neck fittings comprises a threaded engagement mechanism, and the fastening mechanism is formed such that the fastening direction in the threaded connection between the projection and the neck fitting on one side is opposite to the fastening direction in the threaded connection between the projection and the neck fitting on the other side.
- A method for manufacturing a pressure vessel including a hollow liner having a pair of projections projecting in directions away from each other, and a pair of neck fittings connected to the pair of projections via a rotational fastening mechanism, the method comprising: a fastening step of fastening each of the neck fittings to the corresponding one of the pair of projections; and a fiber-reinforced resin layer forming step of rotationally driving the liner and winding a fiber around an outer circumferential surface of the liner to form a fiber-reinforced resin layer, wherein the pair of neck fittings and the pair of projections are formed such that the pair of neck fittings are respectively fastened to the pair of projections in an operation of winding the fiber around an outer surface of the liner by synchronously rotating a drive shaft and the neck fittings with the drive shaft fitted in the pair of neck fittings in the fiber-reinforced resin layer forming step.
Description
TECHNICAL FIELD The present invention relates to a pressure vessel and a method for manufacturing a pressure vessel. BACKGROUND ART A pressure vessel is known which includes a liner having a shell for holding a gas or liquid and a pair of projections projecting outward from the shell, metal neck fitting members provided on the outer circumferences of the projections, and a fiber-reinforced resin layer covering the liner and the neck fitting members (Patent Literature 1). For example, in forming the fiber-reinforced resin layer by filament winding, while a drive shaft fitted to the neck fittings is being rotationally driven to rotate the neck fittings and the liner together, a fiber-reinforced resin is wound around the outer circumference of the liner. CITATION LIST Patent Literature Patent Literature 1: JP2009-58111APatent Literature 2: JP2017-122464A SUMMARY OF INVENTION Technical Problem In the background art, some pressure vessels employ a threaded engagement mechanism to connect a pair of projections and neck fittings, as described in Patent Literature 1. All of threads provided in such a threaded engagement mechanism are right-handed threads (or left-handed threads). Therefore, for example, when unidirectional tension acts on the fiber during filament winding, the tension acts on one of the pair of projections in a neck-fitting fastening direction, while the tension acts on the other projection in a neck-fitting loosening direction. This poses a problem in that the neck fitting on the other side rotates in the loosening direction relative to the liner during filament winding, making it difficult to securely fasten the neck fitting. As described in Patent Literature 2, a method for preventing a neck fitting from rotating relative to a liner is provided by forming a rotation restriction portion, such as a recess or a boss, on the neck fitting. However, this method has a drawback in that the neck fitting structure becomes complicated, which tends to cause forming defects and also increases production costs. The present invention is intended to provide a pressure vessel and a method for manufacturing a pressure vessel that prevent a neck fitting from rotating relative to a liner during manufacturing. Solution to Problem In order to solve the aforementioned problem, the present invention includes a hollow liner having a pair of projections projecting in directions away from each other, a pair of neck fittings connected to the pair of projections via a rotational fastening mechanism, and a fiber-reinforced resin layer formed by winding a fiber around outer circumferential surfaces of the liner and the neck fittings. Fastening directions in the connection between the pair of projections and the neck fittings are set to directions in which the neck fittings are respectively fastened to the pair of projections in an operation of winding the fiber around an outer surface of the liner. Further, the present invention provides a method for manufacturing a pressure vessel including a hollow liner having a pair of projections projecting in directions away from each other, and a pair of neck fittings connected to the pair of projections via a rotational fastening mechanism, the method including: a fastening step of fastening each of the neck fittings to the corresponding one of the pair of projections; and a fiber-reinforced resin layer forming step of rotationally driving the liner and winding a fiber around an outer circumferential surface of the liner to form a fiber-reinforced resin layer. The pair of neck fittings and the pair of projections are formed such that the pair of neck fittings are respectively fastened to the pair of projections in an operation of winding the fiber around an outer surface of the liner by synchronously rotating a drive shaft and the neck fittings with the drive shaft fitted into the pair of neck fittings in the fiber-reinforced resin layer forming step. According to the present invention, it is possible to prevent the neck fittings from rotating relative to the liner during manufacturing without providing a special shape to the liner or the neck fittings. Further, it is preferable that the fastening mechanism between the pair of projections and the neck fittings includes a threaded engagement mechanism and be formed such that a fastening direction in the threaded connection between the projection and the neck fitting on one side is opposite to a fastening direction in the threaded connection between the projection and the neck fitting on the other side. According to the present invention, with a simple structure, it is possible to prevent the neck fittings from rotating relative to the liner during manufacturing. Advantageous Effects of Invention According to a pressure vessel and a method for manufacturing a pressure vessel of the present invention, it is possible to prevent a neck fitting from rotating relative to a liner during manufacturing. BRIEF DESCRIPTION OF DRAWINGS [FIG. 1] FI