DE2045500A1 - Drum washing machine equipped to dry the laundry - Google Patents

Description

Drum washing machine equipped to dry the laundry

They are laundry treatment machines that work according to the drum principle known, which are set up for washing and drying laundry. With these machines is for the necessary heating the lye during the wash cycle, an electrical heating device is arranged outside the drum shell. For the drying process these machines are equipped with an additional electrical heating device.

In many machines there is the one intended for the drying process Heating device even made up of several radiators (DT-OS 1 585 995 and PR-PS 1 522 357), so during the various To be able to set different heating outputs phases of the drying process. The installation of multiple heating devices in a drum washing machine, however, presents a number of considerable difficulties, which begin with the lack of space and extend to the difficulty of assembly and possible maintenance or repairs.

The invention relates to a drum washing machine equipped for drying the laundry with devices for heating the washing or rinsing liquid and for heating the drying air and aims to largely avoid the aforementioned difficulties. For this purpose, it is proposed according to the invention that the devices for heating the washing or rinsing liquid and for Brwärme the drying air consist of a common electric heater which is controllable via a thermo-electric converter and a thyristor.

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209112/1 * 60

VPA 70/9233

The application of the inventive concept "brings a whole series of advantages for drum washing machines used for drying. A considerably smaller installation space is required for the entire heating system, which can be controlled by the thyristor, up to that given by the dimensioning of the heating system and by the maximum voltage Upper limit can be found.

Further advantages are to be mentioned

The simple differentiation of the heating power during drying to adapt to different types of fabric, such as linen "" or synthetic fibers. A division of the radiator is no longer required for this purpose, as the phase control control makes it possible to set any values for the heating energy to adjust.

The practically stepless control of the heating processes, which increases the duration of both the washing and drying processes can be shortened, since the cooling phases that are significant in terms of time down to the lower response limit of a conventional temperature controller can be switched off.

The very simple adaptation to reduced connection values, provided Machines have to be delivered to other countries in which different electrical values must be observed.

The possibility of the drying process being purely temperature-dependent without a timer to be controlled, as the humidity in the laundry room decreases steadily during the drying process.

The proposed new device also makes it possible, with very simple means, to increase the heating power during the washing process in the idle times of the drive by the motor power.

■ -3-209812 / Ufi

VPA 70/9233

The arrangement of a boil-dry protection for the heating is also simplified, since only one heating element needs to be monitored. Purely this heating can be used, for example, on the one protruding from the tub Arrange a suitable temperature sensor, e.g. an NTC thermistor, at the end of the radiator feed.

Closely, the new device enables a machine * which is provided with a condenser with cooling water. That in the drying phase the cooling water is switched on depending on the temperature will. This way the machine can start the Drying process can be heated up faster.

To explain the invention it should be noted that the common electric radiators too, of course - the usual ones Adapted to conditions - can be formed in several parts. However, this is of subordinate importance for the present invention. It is only important that the common radiator is used by both Processes, i.e. both washing and drying, are used will. The use of a thyristor-controlled heater for a tumble dryer is known per se (DT-OS 1 565 100), The known device is concerned but in contrast to the invention only with a dryer, while the invention relates to a drum washing machine which is also used for drying. The characteristic the invention is seen in the two-purpose common radiator.

In the embodiment of the invention you can use the common Radiator controlling thyristor via a temperature controller conventional Control design discontinuously. If, on the other hand, a contactless component is used as a temperature-sensitive element * such as an NTC or PTC resistor, it is a continuous one Control of the thyristor assigned to the common heating element is possible.

Because during the drying process, in addition to the temperature, the moisture content Also plays an essential role is an arrangement of

209812/1460 " ⁴ "

VPA 70/9233

Advantage "with the thyristor controlling the common heating element in addition to being controlled by a temperature regulator, it can also be controlled via a moisture-dependent resistor, often referred to as a "humistor".

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The invention is explained in more detail with the aid of some exemplary embodiments shown in the drawing.

FIG. 1 shows a vertical section through a drum washing machine _{9 that can be} loaded with a jacket, while FIGS. 2 to 3a show two circuit examples for a thyristor-controlled heater *

In the drum washing machine that can be loaded with a jacket, 11 denotes the outer housing and 12 denotes the tub _a. In the tub, the drum 13 holding the laundry is arranged with a horizontal drum axis. The common heating element 15 and a temperature sensor 16 that monitors the washing or drying process are located in the space between the tub and the drum.

A part of the wall of the suds container is removed during drying a sprinkler 19 covered with a cooling water film serving to precipitate the expelled moisture. ^ The draining cooling water is fed to the drain pump 20.

A circuit example for the operation of a thyristor-controlled heater is shown in FIGS. 2 and 2a. With the radiator 15, a thyristor is connected in series 21 _t whose grating 22 in known manner via a trigger diode 23 to a parallel current path 24 are connected, in the one behind the other a plurality of matching resistors 25, a serving as temperature or humidity-sensing resistor 16 and a Capacitor 27 are connected. Depending on the electrical data 18 of the voltage phase ", the thyristor is ignited at a certain point (Fig _o 2a). Since the thyristor is only effective in one current direction, there is a parallel

209812 / H60 ' ~ ⁵ ~

YPA 70/9253

IeI to him a rectifier 29 to suppress the negative Avoid half-wave. This half-wave (Fig. 2a) kanit through the Control circuit are not affected.

-Fig. 3 shows a circuit analogous to FIG. 2, in which only the thyristor 21 by a double thyristor arrangement effective in both directions (Triac 31) is replaced, the mode of operation is indicated schematically in Fig. 3a. -. ■ ":

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5 figures

■■ ■ ^'■:., - ι

209812 / H60

Claims (4)

■ '. "VPA 70/9233 Claims (λ) Drum washing machine equipped for drying the laundry with devices for heating the washing or rinsing liquid and for heating the drying air, characterized in that the devices for heating the washing or rinsing liquid and for heating the drying air consist of a common electric heater, the can be controlled via a thermo-electrical converter (16) and a thyristor (21 or 31). 2. Drum washing machine according to claim 1, characterized in that that the thyristor controlling the common heating element can be controlled discontinuously via a temperature regulator of conventional design is. 3. Drum washing machine according to claim 1, characterized in that the thyristor controlling the common heating element has a temperature-dependent resistance (NTC or PTC) continuously is controllable. 4. drum washing machine according to claim 2 or 3, characterized in that that the thyristor controlling the common heating element in addition to being controlled by a temperature controller a humidity-dependent resistor (humistor) can be controlled. 209812/1460