Washing machine with improved pump control device for closing a

Details Washing machine with improved pump control device for closing a Washing machine with improved pump control device for closing a

1989-06-09

1990-08-07

Coe, Philip R.

Textiles: fluid treating apparatus

Machines

Single tub and automatic sequential operation mechanism

68208, D06F 3302, D06F 3908

Patent

active

049457357

ABSTRACT:
Washing machine is provided with improved pump control device for closing a valve, in particular a flap valve, for detergent economy, and control device suited for use in a washing machine.
A washing machine comprising a tub (104), a solenoid valve (3) for the water feed into the tub (104), a discharge pipe (103), a delivery pipe (107), a pump (101) and a valve preferably a flap type (102) for detergent economy located at the mouth of the discharge pipe (103) at the tub (104), the washing machine (100) comprising a control device (1) for pulse-operating the pump (101) to create a water head in the discharge pipe (103) which is able to close the valve (102), the device (1) comprising a resistor (2) the resistance of which varies directly as a function of its temperature and which is connected in parallel with the solenoid valve (3) and in series with the pump (101), the device (1) for pulse-operating the pump (101) further comprising means (14) which dissipate heat when traversed by current and which thermally coupled with the variable resistor (2), the means (14 ) maintaining the temperature of the resistor (2) relatively high so that its resistance remains high during the operating stages of the washing machine (100) subsequent to starting.

REFERENCES:
patent: 3285038 (1966-11-01), Wolverton
patent: 4821537 (1989-04-01), Zinkann et al.

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