Pumps – Condition responsive control of pump drive motor – Responsive to accumulation of pumped liquid in receiver
Patent
1987-03-10
1988-09-27
Croyle, Carlton R.
Pumps
Condition responsive control of pump drive motor
Responsive to accumulation of pumped liquid in receiver
251 75, 417 39, 417138, F04F 106
Patent
active
047738308
ABSTRACT:
A gas driven pump (102) is controlled by an asynchronous controller (101). The controller (101) has two control conduits (105,103) respectively in communication with the bottom and top regions of the chamber of the pump (102). Low pressure air is bubbled through the control conduit (105) in communication with the bottom region of the pump chamber; therefore, the pressure in that conduit, which is applied to the face top of the diaphragm (111), in a direct function of the depth of the liquid in the pump chamber. The other control conduit (103) is in communication with the bottom face of the diaphragm (111). When the difference of the pressures in the control conduits (105,103) exceeds the bias of the spring (114), the diaphragm (111) and the attached spool (128) move downward to activate a mechanically operated pilot valve (144). The pilot valve, in turn, releases supply air under pressure to switch the main valve (145) from the rest state to the operated state to initiate discharge of liquid by the pump. When the level of the liquid in the pump chamber falls to a point where the difference in the pressures in the control conduits reaches a second threshold value, the diaphragm moves upward to the rest state; the pilot valve and the main valve are deactivated; and the pump,enters the fill state.
REFERENCES:
patent: 1191469 (1916-07-01), Rixen
patent: 2551445 (1951-05-01), Lindsey et al.
patent: 2671632 (1954-03-01), Palmer
patent: 2689585 (1954-09-01), Presnell
patent: 3422768 (1969-01-01), Repp
patent: 3922111 (1975-11-01), Deters
patent: 4021147 (1977-05-01), Brekke
patent: 4207030 (1980-06-01), Pearson
patent: 4645426 (1987-02-01), Hartley et al.
Addison Pump Company
Albrecht John C.
Croyle Carlton R.
Olds Theodore
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