Patent ID: 7510103
Filing Date: 2009-03-31
Classification: B05C,F04B,G01F

Abstract:
1. A device for delivering a fixed quantity of liquid, comprising: a pump section for metering the delivered liquid to provide a desired amount, said pump section including a cylinder block having a penetration hole to form a plunger chamber, a plunger reciprocating in said plunger chamber and a motor for moving said plunger by a desired stroke; a valve section for switching between liquid flow channels for suction and delivery; a reservoir section for reserving the liquid and being communicable with said pump section depending upon the position of said valve section; a delivery section having a delivery port for delivering the liquid; and a control section for operating the plunger so that one delivery cycle is carried out by one sucking operation and one discharging operation of the plunger, wherein said valve section is slidingly connected to said pump section, and a maximum advance position of said plunger at the time of completing the delivery of one delivery cycle is controlled by a position where a fore end surface of said plunger contacts an end of said penetration hole, and wherein said valve section includes a slide valve brought into close contact with said cylinder block under action of air pressure.