Patent ID: 7048801
Filing Date: 2006-05-23
Classification: F04B,H01L,Y10T

Abstract:
1. In combination with an acting element for exerting a predetermined action on a chemical solution, a chemical pump for pumping said chemical solution through said acting element, comprising: a pressure chamber divided by a movable partition member into a first chamber and a second chamber; a single driving element for driving said partition member to reciprocate, thereby changing a volume ratio between said first chamber and said second chamber while the sum of the volumes of said first and second chambers is held constant; and a pipe provided outside said pressure chamber, for passing said chemical solution between said first chamber and said second chamber, wherein said single driving element drives said partition member in such a manner that, when the volume of said first chamber decreases, the decreased volume of said first chamber is equal to an increased volume of said second chamber, and when the volume of said first chamber increases, the increased volume of said first chamber is equal to a decreased volume of said second chamber, and the chemical solution sucked and introduced into said first chamber by driving said partition member in a first direction is moved via said acting element inserted in said pipe into said second chamber by driving said partition member in a second direction, and is then discharged out of said second chamber by driving said partition member in said first direction again.