| 摘要 |
PROBLEM TO BE SOLVED: To provide a diaphragm pump can reducing pulsation with a very simple structure in diaphragm pumps which have a vibration diaphragm gripped between a pair of housings, have a pump chamber formed in at least one of an upper and a lower part of the vibration diaphragm, are provided with a suction side check valve allowing fluid flow from a suction port to the pump chamber and not allowing fluid flow in a reverse direction between the pump chamber and the suction port, are provided with a delivery side check valve allowing fluid flow from the pump chamber to a delivery port and not allowing fluid flow in a reverse direction between the pump chamber and the delivery port, and provide pump action by vibrating the vibration diaphragm. SOLUTION: In this diaphragm pump, a pulsation reduction diaphragm composed of a pair of elastic materials corresponding to the suction port and the delivery port is gripped between the pair of housings with keeping different flat surface position from the vibration diaphragm, a recess part defining a variable volume liquid chamber and a variable volume air chamber at an upper and a lower part of the pair of pulsation reduction diaphragms is formed in the pair of housings respectively, and the pair of variable volume liquid chambers are communicated to the suction port and the delivery port respectively. COPYRIGHT: (C)2009,JPO&INPIT
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