Pumps – Condition responsive control of pump drive motor – Having timer or delay means
Patent
1987-08-07
1988-09-13
Croyle, Carlton R.
Pumps
Condition responsive control of pump drive motor
Having timer or delay means
417 37, 417135, 417136, 417140, 417478, 119 3, F04F 106
Patent
active
047706104
ABSTRACT:
A pump for pumping a slurry of frail material is provided by a rigid chamber which is connected to a source of negative air pressure when an inlet valve is open and an outlet valve closed to suck the slurry through the open inlet valve into the chamber, the amount of slurry in the chamber is sensed and when it reaches a preset amount a controller is triggered to disconnect the source of negative pressure and close the inlet valve, and then admit air under positive pressure to the chamber, then open the outlet valve to drive the contents of the chamber through the outlet by replacing a significant amount of the contents with air. The controller then causes the air pressure in the chamber to be reduced and closes the outlet valve, and then reconnects the chamber to the source of negative pressure and then opens the inlet valve to commence a second cycle. The inlet and outlet valves are bladder type valves to protect the frail material and permit simplified operation.
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Croyle Carlton R.
Innovac Technology Inc.
Olds Ted
Rowley C. A.
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