Pressure shell, high-pressure tank provided with the pressure shell, manufacturing method of the high-pressure tank and manufacturing apparatus of the high-pressure tank

A manufacturing method of the high-pressure tank provided with a pressure shell which is formed by winding reinforcement fibers provided with resin material for hardening on an outer surface of an hollow tank base body, wherein

• fluid for pressure regulation is filled in the inside of the tank base body,
• in forming a lowermost fiber layer, pressure applied to the fluid for pressure regulation is set to a given pressure and the reinforcement fibers are wound around the tank base body while applying a given tension to the reinforcement fibers,
• in laminating new fiber layers, the fiber layers are laminated in multiple layers in a state that the pressure applied to the fluid for pressure regulation is gradually decreased corresponding to the number of laminated layers, and a tension applied to the reinforcement fibers is gradually increased corresponding to the number of laminated layers thus forming the pressure shell, and
• when the inside of the tank base body is emptied, a compressive force is applied to the lower fiber layers and, at the same time, a tensile force is applied to the upper fiber layers among the multi-laminated fiber layers.

A manufacturing apparatus of a high-pressure tank which includes a pressure shell which is formed by winding reinforcement fibers provided with resin material for hardening on an outer surface of a hollow tank base body using a reinforcement fiber winding means, wherein

• fluid for pressure regulation is filled in the inside of the tank base body and, at the same time, the manufacturing apparatus includes pressure regulating means which regulates a pressure applied to the fluid for pressure regulation,
• in forming the lowermost fiber layer, the reinforcement fibers are wound around the tank base body to form the fiber layer by setting the pressure applied to the fluid for regulating pressure to a given pressure using the pressure regulating means and by applying a given tension to the reinforcement fibers using the reinforcement fiber winding means,
• in laminating new fiber layers, the fiber layers are laminated in multiple layers to form the pressure shell by gradually decreasing the pressure applied to the fluid for regulating pressure using the pressure regulating means corresponding to the number of laminated layers and, at the same time, by gradually increasing the tension applied to the reinforcement fibers using the reinforcement fiber winding means corresponding to the number o f laminated layers, and
• in a state that the inside of the tank base body is emptied, a compressive stress is applied to the lower fiber layers among the multi-laminated fiber layers and, at the same time, a tensile stress is applied to the upper fiber layers.