Pumps – Condition responsive control of pump drive motor – Single motor control element responsive to means sensing...
Patent
1980-04-14
1982-10-05
Croyle, Carlton R.
Pumps
Condition responsive control of pump drive motor
Single motor control element responsive to means sensing...
417 42, 417 45, 417 53, 417265, F04B 4906
Patent
active
043526365
ABSTRACT:
A pump for producing a substantially smooth and continuous outflow of liquid at relatively high pressure has two piston assemblies flow connected in series. The first piston assembly includes a pressure piston having a long suction stroke and a relatively short and abrupt expulsion stroke. A valve at the inlet of the pressurization piston allows flow to enter (but not exit), and a valve at the outlet of the pressurization piston allows flow to exit (but not enter). The second piston assembly includes a damper piston which functions as a mechanically driven damper to smooth the outflow from the pressure piston. This smoothing is accomplished by storing of the liquid displaced by the expulsion stroke of the pressure piston and then delivering the stored pressurized liquid to the pump outlet during the suction stroke of the pressure piston.
The drive for the pistons is constructed to produce an increased outflow of pressurized liquid for a short interval at the beginning of the expulsion stroke of the pressure piston to compensate for compressibility of the liquid at high pressure. At low pressure, the stepper motor drive is slowed down in response to the sensing of the increase of the outflow during this short interval to maintain the outflow smooth and continuous during this part of the cycle of operation.
REFERENCES:
patent: 3597114 (1971-08-01), Hrdina
patent: 3847507 (1974-11-01), Sakiyama et al.
patent: 4067666 (1978-01-01), Richards
patent: 4128476 (1978-12-01), Rock
patent: 4137011 (1979-01-01), Rock
patent: 4180375 (1979-12-01), Magnussen
patent: 4245963 (1981-01-01), Hutchins et al.
Bradley Martin P. T.
Miller Leslie A.
Patterson Williams G.
Rochkind Allen B.
Croyle Carlton R.
Feix Donald C.
Look Edward
Spectra-Physics Inc.
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