DE1201292B - Automatic washing machine - Google Patents

Description

Automatic washing machine The invention relates to an automatic washing machine in which at least two different water levels can be set for the washing and rinsing cycles. For this purpose, two level switches are required in conventional washing machines.

The arrangement of two level switches has the disadvantage, in addition to the material expenditure, that the setting of the switches is difficult given the small distance between the two levels. In practice, the difference between - the two levels is therefore considered to be much greater than would be necessary for reasons of washing technology.

The invention is based on the object of two different levels can be set using just one level switch and the program switch.

The invention consists in that when using one in the water supply line lying solenoid valve with flow regulator the lower water level of a Level switch and the difference in the amount of water from the lower to the upper level over time can be controlled by the program switch.

This results in great accuracy, especially at the upper water level achieved with a single simple level switch.

The invention is explained in more detail using an example with the aid of the drawing. It shows F i g. 1 the position of the individual switching elements to one another and FIG. 2 shows a program section as far as it relates to the control of the two water levels.

The solenoid valve Z is located in the water supply line a to the washing machine, which is not shown in full. Two parallel circuits lead to its winding via the main switch H. In one circuit there is the level switch N for the lower washing level and, behind it, the contact P1 controlled by the program switch, which is closed when the lower washing level is desired. Contact P2 for the upper wash level, controlled by the program switch, is located in the circuit parallel to this.

The function is as follows: If the lower water level is desired (main wash and 1st rinse cycle), contact P is closed at the time of the program. Since the main switch H is closed at the same time and the level switch N is in the "empty" position, the solenoid valve Z receives power, which opens it and water flows in until the lower water level is reached and the level switch N switches to the "full" position . The solenoid valve is de-energized. At the same time, the program switch is switched to the next program level in a manner known per se via the line b, which is now under voltage, and a cap button.

If the upper water level is desired (pre-wash and 2nd to 5th rinsing), then contact P2 is closed at the time in accordance with the program, whereby the solenoid valve Z is under voltage and the water flows in. After reaching the lower wash levels, the level switch N switches turn on the line b and a dome magnet program cbalter on, JE but is not simultaneously interrupted power to the solenoid valve Z, but the contact P2 is still a fixed period of z. B. closed for 30 seconds, which is necessary to allow the difference in the amount of water to flow in between the lower and upper washing level.

The accuracy achieved here for the amount of water flowing in between the lower and upper washing level depends on the valve design . The flow rate of commercially available valves with flow regulators can, however , be kept constant between 2 to 10 atmospheres, so that a level accuracy that has not been achieved before or that can only be achieved with great effort is achieved with simple means.

Should the water pressure be below 2 atmospheres and thus a little less Water flow, this inaccuracy is largely compensated by that during the also longer time until reaching the lower water level the laundry can absorb more water and thus the total amount flowing in is greater can be than with normal water pressure.

Claims (2)

Patent claims: 1. Automatic washing machine, in which washing can be carried out either with a lower or upper water level for the various washing phases , characterized in that when using a solenoid valve with a flow regulator located in the water supply, the lower water level from a level switch and the difference in the amount of water from lower. to the upper water level can be timed from the P, program switch. 2. Automatic washing machine according to claim 1, characterized in that in series with the solenoid valve there are two parallel circuits which can be switched on by the program switch, one of which can be switched off by a level switch monitoring the lower washing level.