Metering dispenser of a screw pump

Details Metering dispenser of a screw pump Metering dispenser of a screw pump

1987-11-25

1988-10-18

Marmor, Charles A.

Dispensing

Automatic control

Constant weight, volume or pressure control by output

222 56, 222255, 222413, 222542, 417295, 418 48, B67D 548, B67D 552

Patent

active

047780800

ABSTRACT:
This disclosure relates to a metering dispenser which dispenses fluid in accurate proportion to the pump revolution speed, and to an improved shaft seal for the motor drive shaft of a metering dispenser. An elastic sleeve membrane is mounted inside an expanded area provided in a part of the peripheral wall of the pump casing so that a constant-pressure chamber is formed to the outside of this sleeve membrane, and the pressure inside the pump casing is maintained within a set pressure range by introducing a pressurized fluid into this constant-pressure chamber and releasing the pressurizing fluid from the constan-pressure chamber as needed. The improved shaft seal includes a circular channel formed at the center of the shaft seal, this circular channel and the aforementioned constant-pressure chamber being linked, and the internal pressure of the pump casing acting upon the pressure inside this circular channel via the elastic sleeve membrane of the constant-pressure chamber so that the pressure inside the circular channel and the internal pressure of the pump casing are always equal.

REFERENCES:
patent: 4682710 (1987-07-01), Turner, Jr. et al.
Technical Article of Japan Accumulator Co. in Shizuoka, Japan.

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