Two-stage pump assembly

Details Two-stage pump assembly Two-stage pump assembly

1986-01-28

1987-07-21

Croyle, Carlton R.

Pumps

Condition responsive control of pump drive motor

Plural pumps having separate drive motors, supply sources,...

417 18, 417 45, 417 63, 417265, F04B 4106, F04B 4906, F04B 300

Patent

active

046815139

ABSTRACT:
An accurately controllable two-stage pump assembly comprising two plunger pumps connected in series. The suction port of the outlet pump A is connected to the discharge port of the inlet pump B, so that the discharge port of the outlet pump A and the suction port of the inlet pump B act as the discharge port and the suction port, respectively, of the whole pump assembly. While the inlet pump B is delivering fluid from the whole pump assembly, the outlet pump A completes the filling stroke of the whole pump assembly and fully increases the pressure inside the chamber of the outlet pump A. While the inlet pump B is filling, the outlet pump A is in the stage of displacement stroke and delivers fluid from the whole pump assembly. The plungers of the pumps are moved via cams by stepper motors which swing or rotate back and forth within a certain angular range.

REFERENCES:
patent: 4137011 (1979-01-01), Rock
patent: 4225290 (1980-09-01), Allington
patent: 4236877 (1980-12-01), Curtis
patent: 4321014 (1982-03-01), Eburn, Jr. et al.
patent: 4352636 (1982-10-01), Patterson et al.
patent: 4359312 (1982-11-01), Funke et al.
patent: 4389163 (1983-06-01), Magnussen, Jr. et al.
patent: 4552513 (1985-11-01), Miller et al.
patent: 4556367 (1985-12-01), Schmid
patent: 4600365 (1986-07-01), Riggenmann

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