Patent ID: 7204961
Filing Date: 2007-04-17
Classification: F04B,Y10T

Abstract:
1. A liquid feed apparatus comprising a liquid feed chamber having an inlet port and one outlet port and having a variable volume, and a deformable diaphragm constituting at least one of side surfaces defining said liquid feed chamber, said diaphragm being deformed in a direction in which the volume of said liquid feed chamber increases, so as to introduce fluid into said liquid feed chamber through said inlet port, and said diaphragm being deformed in a direction in which the volume of said liquid feed chamber decreases, so as to discharge the fluid through said outlet port, said liquid feed chamber being provided in the inlet port with a valve for decreasing a resistance of fluid flowing into from the outside, and in the outlet port with a valve located for decreasing a resistance of fluid flowing out to the outside, but increasing a resistance of fluid flowing into from the outside, said liquid feed chamber has a peripheral part circumscribing the liquid feed chamber, the outlet port is formed at said peripheral part of the liquid feed chamber, said valves provided in the inlet port and said outlet port are molded integrally through silicon processing in a liquid feed chamber substrate formed therein with said liquid feed chamber, and each of said valves is composed of a valve seat part and resiliently deformable beams integrally incorporated with the valve seat part so that the valve seat part is pressed against the associated inlet or outlet port by a force exerted by the beams resiliently deformed, the valve seat part is displaceable to and from the associated inlet or outlet port.