PUMP EQUIPPED WITH PULSATION REDUCING DEVICE

摘要

PROBLEM TO BE SOLVED: To miniaturize an entire pump and to reduce an area occupied by installing while ensuring the increase in the internal capacity of an air chamber used for reducing pulsation so as to increase a pulsation reducing effect. SOLUTION: A reciprocating pump portion 4 is constructed by providing a first diaphragm 7 driven by an air cylinder portion 14 to be elongated/ contracted and deformed in one side part of a partition wall 1 provided with inlet and outlet passage 2 and 3, and check valves 16a and 16b alternately opened/closed in a pump operation chamber 9a formed in the first diaphragm 7. In the other side of the partition wall 1, a second diaphragm 17 having a liquid chamber 20a for storing liquid discharged from the pump portion 4 and a device side air chamber 20b separated from the liquid chamber 20a and deformed by elongation/contraction, and thereby a pulsation reducing portion 5 is provided for absorbing the pulsation of the liquid discharged from the pump portion 4 by the capacity change of the liquid chamber 20a. A separation air chamber 30 separate from the device side air chamber 20b is provided, and both 20b and 30 are connected to each other by a tube 40.