Dishwasher with reversible motor pumping system

Details Dishwasher with reversible motor pumping system Dishwasher with reversible motor pumping system

1991-11-15

1993-02-09

Coe, Philip R.

Cleaning and liquid contact with solids

Apparatus

With movable means to cause fluid motion

134111, 134179, 134188, 4151691, A47L 1508

Patent

active

051846381

ABSTRACT:
In a reversible motor pumping system of a dishwasher, the reversible electrical motor has a drag shaft on which are mounted the impellers of a circulation pump and a discharge pump. The discharge pump is provided in a hydraulic discharge circuit so as to force fluid from the dishwasher after having washed the objects in the dishwasher. The discharge pump includes a lateral wall defining a chamber of a substantially circular section in which the impeller of the discharge pump is housed. An aspiration inlet is open to the chamber and communicates with the interior of the dishwasher while a delivery outlet is open to the chamber at a location spaced from the aspiration inlet such that a portion of the lateral wall defining the chamber extends between the aspiration inlet and the discharge outlet. This portion of the lateral wall constitutes a tooth of the discharge pump having a reduced inner diameter. At least one air intake is open to the chamber at the tooth of the discharge pump. Thus, the reduced pressure at the tooth of the discharge pump inhibits water being forced through the discharge circuit from flowing back through the air intake and into the bottom of the dishwasher. Therefore, problems which would otherwise occur in such a case are alleviated.

REFERENCES:
patent: 2019143 (1935-10-01), La Bour
patent: 3612714 (1971-10-01), Ruspino

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