Patent ID: 6422430
Filing Date: 2002-07-23
Classification: F04B

Abstract:
A pressure pump for high viscosity fluid in which, in order to draw and deliver by pressure a high viscosity fluid stored in a can therefrom, a follow plate unit for sealing an upper surface of said can to apply pressure to said high viscosity fluid stored therein is attached to a lower end of a transport pipe capable of being moved up-and-down with respect to said can, said pressure pump characterized in that said follow plate unit comprises: a follow plate body having a guide passage for the high viscosity fluid; a cylinder fitted on an outer surface of said follow plate body so as to be capable of being moved upward and downward along a vertical direction; an upper plate attached to said cylinder so as to be capable of being moved upward and downward along therewith; a lower plate attached to a lower portion of said follow plate body; and a ring elastic sealing member interposed between said upper plate and said lower plate; wherein a pressure chamber for making a compressed air flow in-and-out is provided between said follow plate body and said cylinder; a compressed air inlet/outlet port is provided on said cylinder so as to communicate with said pressure chamber; said ring elastic sealing member comprises an upper ring elastic sealing member and a lower ring type elastic sealing member; said lower ring type elastic sealing member is fixed to said lower plate; said upper ring elastic sealing member is fixed to said upper plate; said upper ring elastic sealing member and said lower ring type elastic sealing member are bonded with each other at outer peripheral portions thereof to be formed into a contact portion which is to be brought into contact with a wall inner surface of said can; and an outer diameter of said ring elastic sealing member is extended or contracted by flow-in or flow-out of the compressed air to or from said pressure chambers.