Patent ID: 9239047
Filing Date: 2016-01-19
CPC Classification: F04B

Claim Text:
1. A bellows pump comprising: a case member that forms an axial space therein; closed-bottomed cylindrical bellows that are arranged in the axial space to extend and contract in an axial direction and axially separate the axial space into a pump chamber and an operation chamber; suction valves that are provided on a suction side of the pump chamber and guide a fluid to be transferred to the pump chamber; and discharge valves that are provided on a discharge side of the pump chamber and discharge the fluid to be transferred from the pump chamber, wherein the bellows are extended and contracted by introducing a working fluid into the operation chamber and discharging the working fluid from the operation chamber, thus transferring the fluid to be transferred, each of the bellows is configured by alternately forming mountain portions and valley portions along the axial direction and having, on a predetermined position in the axial direction where a valley portion is formed, an annular ring portion extending in a radial direction from the valley portion to a mountain portion, the radial direction being perpendicular to the axial direction, each of the bellows further including at least one additional annular ring portion, the at least one additional annular ring portion extending in the radial direction from another valley portion to another mountain portion and being formed at a predetermined interval relative to the annular ring portion in the axial direction, and each of the annular ring portion and the at least one additional annular ring portion being integrally formed as a single piece with the valley portions and the mountain portions of the bellows.