Helical metering pump having different sized rotors

Details Helical metering pump having different sized rotors Helical metering pump having different sized rotors

1990-08-30

1992-04-28

Vrablik, John J.

Rotary expansible chamber devices

With plural working fluid inlet or outlet passages

418 48, 418153, 137 99, F04C 500, F04C 1100, G05D 1102

Patent

active

051082730

ABSTRACT:
A pump assembly includes commonly driven coaxially positioned helical rotors, rotatably engageable within corresponding stators. Each combination of rotor and stator defines a pump having a different volumetric flow rate, each pump discharging to a common discharge port, thereby providing an accurately proportioned mixed fluid of two separate fluids. The rotors are integrally molded from a thermoplastic material and include an integral drive shaft suitable for interconnection to an electric motor. The two rotors are simultaneously driven by a common drive shaft and therefore produce a constant mixed ratio irrespective of rotational speed.

REFERENCES:
patent: 2329386 (1943-09-01), Brennan
patent: 2691346 (1948-09-01), Conery
patent: 2733854 (1956-02-01), Chang
patent: 3203350 (1965-08-01), Chang

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