Pumps – Motor driven – Fluid motor
Patent
1994-11-03
1996-10-15
Freay, Charles G.
Pumps
Motor driven
Fluid motor
417393, 417566, 92104, 251297, F04B 4306
Patent
active
055649114
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE PRESENT INVENTION
The present invention relates to pumps and more particularly but not exclusively to air operated pumps to move liquid, including liquid having suspended solids (sludge).
The invention also pertains to a control valve and more particularly to a control valve in which the conventional ball and spring detent mechanism is replaced with a polymeric O-ring or rings.
The invention also relates to diaphragms employed in air operated pumps to move liquid.
BACKGROUND OF THE INVENTION
Compressed air operated pumps are known to consist of reciprocating dual diaphragms located within a metal pump body. The pump chambers are serviced by cast metal manifolds. The overall weight of these previously known pumps is considerable which is of a major disadvantage where the unit must be manhandled. This problem is exacerbated in cramped areas such as mines.
Control valves such as spindle valves often include a positive locating device or detent mechanism. The locating device or detent mechanism positively orients the shaft or spindle of the valve with respect to the sleeve or valve body. Prior art spindle valves tended to jam because the steel balls of the detent mechanisms were susceptible to wear, the wear pattern increasing the likelihood of jamming between the shaft and the sleeve or body of the valve.
Compressed air operated pumps are known to consist of reciprocating dual diaphragms located within a metal pump body. The pump chambers are serviced by manifolds. For example, such a pump is described in U.S.. Pat. No. 4,238,992.
The pump described in the abovementioned USA patent suffers from the disadvantage that the diaphragms fail at an unacceptably low number of cycles.
OBJECT OF THE INVENTION
It is the object of the present invention to overcome or substantially ameliorate at least one of the above disadvantages.
SUMMARY OF THE INVENTION
There is disclosed herein a pump comprising: pump chambers; being associated with a respective pump chamber so as to divide its pump chamber into a pumped fluid sub-chamber and a working fluid sub-chamber; unison to vary the volume of the sub-chambers upon the flow of working fluid to or from the working fluid sub-chambers; the working fluid sub-chambers to cause reciprocation of the diaphragms; fluid sub-chamber permitting delivery of fluid to its associated pump chamber; fluid sub-chamber permitting the fluid to be pumped to flow from the respective sub-chamber; and pumped fluid sub-chamber, each manifold being of a unitary construction of plastics material and having a first duct communicating with the associated first valve, and a second duct associated with the respective second valve of the associated pumped fluid sub-chamber.
There is further disclosed herein a spindle valve comprising a spindle shaft which slides within a cylindrical body, the body having a plurality of ports which cooperate with machined portions of the spindle shaft, the shaft also comprising two or more locating grooves, the body including at least one internal groove in which is located an O-ring. The O-ring allows the spindle shaft to slide axially and rotate within the spindle body. When the O-ring is situated around one of the locating grooves on the spindle shaft, interference between the O-ring and the shaft axially stabilizes the spindle shaft until such a time as the axial position of the shaft is changed by the application of some external force.
There is further disclosed herein a pump diaphragm formed of resilient material and comprising: piston; and and/or the peripheral portion.
Preferably, the central portion is of a circular configuration and the peripheral portion is of an annular configuration. The hinge means includes two annular hinge portions, a first one of the hinge portions connecting the intermediate portion with the peripheral portion, and the other hinge portion connecting the central portion and the intermediate portion.
Preferably, the hinge means serves to reduce deformation-generated heat stress.
BRIEF DESCRIPTION OF THE DRAWINGS
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REFERENCES:
patent: 3072149 (1963-01-01), Hasbany
patent: 3174500 (1965-03-01), Johnson
patent: 3735781 (1973-05-01), Kesti
patent: 3860034 (1975-01-01), Rupp
patent: 4237775 (1980-12-01), Eisele
patent: 4381180 (1983-04-01), Sell
patent: 4521165 (1985-06-01), Handleman
patent: 4895494 (1990-01-01), Gardner
patent: 5180270 (1992-04-01), Kozumplik, Jr.
PCT search report, PCT/AU93/00086 Jun. 1993.
Freay Charles G.
Joe Santa & Associates Pty Limited
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