Pumps – Expansible chamber type – Having pumping chamber pressure responsive distributor
Reexamination Certificate
1999-10-05
2001-05-08
Freay, Charles G. (Department: 3746)
Pumps
Expansible chamber type
Having pumping chamber pressure responsive distributor
C417S413100, C092S099000
Reexamination Certificate
active
06227826
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to pumps, and more particularly to a diaphragm activated compression pump, which produces little friction force during its pumping operation.
Conventional compression pumps have different designs including reciprocating type, rotary type, vane wheel type, or eddy flow type. Either of the known compression pump designs produces high friction force and heat. In order to minimize friction between parts, lubricating oil shall be applied. Further, because the fluid chamber in a convention compression pump is not kept in a perfect airtight condition, the fluid compression effect is not satisfactory.
SUMMARY OF THE INVENTION
The present invention has been accomplished to provide a compression pump, which eliminates the aforesaid drawbacks. It is one object of the present invention to provide a compression pump, which keeps the fluid chamber in a perfect airtight condition during its operation. It is another object of the present invention to provide a compression pump, which produces little friction force and heat during its operation. According to one aspect of the present invention, the compression pump comprises a base frame, a pressure cylinder fastened to the base frame, the pressure cylinder having a fluid chamber, a fluid inlet, and a fluid outlet, and a fluid pumping mechanism mounted in between the base frame and the pressure cylinder, the fluid pumping mechanism comprising an actuating member fixedly connected between the pressure cylinder and the base frame, the actuating member having an integrated semispherical diaphragm reciprocated in and out of the fluid chamber to draw fluid into the fluid chamber through the fluid inlet and to force fluid out of the fluid chamber through the fluid outlet, a reciprocating rod driven to reciprocate the diaphragm of the actuating member, and a supporting cup connected between the actuating member and the reciprocating rod for enabling the diaphragm of the actuating member to be moved in and out of the fluid chamber in the pressure cylinder. According to another aspect of the present invention, a first one-way valve is mounted in the fluid inlet for letting fluid pass from an external fluid source to the fluid chamber and preventing fluid from escaping out of the fluid chamber through the fluid inlet, and a second one-way valve is mounted in the fluid outlet for letting fluid pass out of the fluid chamber to the outside of the pressure cylinder through the fluid outlet and preventing fluid to flow back to the inside of the fluid chamber. According to still another aspect of the present invention, the pressure cylinder has a plurality of annular grooves at the back side wall of a rear flange thereof, and the actuating member of the fluid pumping mechanism has a plurality of coupling flanges respectively engaged into the annular grooves at the pressure cylinder to seal the gap between the pressure cylinder and the actuating member.
REFERENCES:
patent: 3289547 (1966-12-01), Kytta
patent: 4393749 (1983-07-01), Miyazaki
patent: 4571160 (1986-02-01), King et al.
patent: 5192198 (1993-03-01), Gebauer et al.
patent: 5863184 (1999-01-01), Juterbock et al.
Dougherty & Troxell
Freay Charles G.
Gray Michael K.
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