Patent ID: 6623257
Filing Date: 2003-09-23
Classification: F04B

Abstract:
A system for supplying a fixed amount of fluid comprising:a fluid accommodating unit comprising a fluid accommodating bag for accommodating fluid therein and a bellows pump connected to the fluid accommodating bag for pumping the fluid; and a fluid supplying device in which the pump driving mechanism for driving the bellows pump is disposed detachably to the fluid accommodating unit, the system supplying a fixed amount of the fluid by the fluid accommodating unit in the fluid supplying device when the fluid is being supplied, wherein the bellows pump connected to the fluid accommodating bag comprises a bellows and two check valves arranged in a fluid inlet and a fluid outlet of the bellows, respectively, wherein the check valves of the bellows pump are each comprising a valve base whose downstream surface is curved to be convex toward the downstream side and a valve body made from an elastic thin plate for covering the downstream surface of the valve base, wherein the valve base having more than one fluid-flow-through holes piercing from the fluid upstream surface all the way to the downstream surface, wherein the valve body is fixed to the valve base on its periphery and has a hole at its center for allowing the flow of the fluid, wherein the pump-driving mechanism of the fluid supplying device is adapted to drive the bellows so as to expand and contract the bellows at a predetermined stroke when the fluid accommodating unit is placed in the system for supplying a fixed amount of fluid, wherein an outlet of the bellows pump is provided with a sealing-valve mechanism for closing the outlet, and the fluid supplying device is provided with a sealing-valve driving device for driving the sealing-valve mechanism when the bellows pump is not being driven, wherein the afore mentioned sealing-valve mechanism comprises a cylinder which vertically moves so that the periphery of the valve body hole of the check valve arranged at the downstream surface can be pushed against the valve base while allowing the fluid to flow-through the inside of the cylinder.