DE3017109C2 - - Google Patents

Description

The invention relates to a method for operating a Drum washing and drying machine.

Combined washing and drying machines are known where the process heat by a radiation principle acting heater is supplied and which is a condensation device for washing out have expelled steam. (DE-OS 20 47 856)

Have washer-dryer of the type currently in use the advantage of being able to wash in a single device, Allow spinning and drying of laundry and therefore in confined spaces compared to two Individual devices are preferred.

On the other hand, they have a number of significant ones Disadvantages, primarily due to the drying process are caused. The drying process can usually only with a poor efficiency carry out what is due to excessively long drying times noticeable.

The invention is therefore based on the object the combined drum washing and drying machines the drying process of the type mentioned at the beginning accelerate and improve efficiency to expire.

The solution to this problem is through the main claim marked procedures achieved.

Further refinements of the invention result from the subclaims.

It is known from DE-OS 22 33 698, the drum a drum washing and drying machine during the Drying to drive at a speed at which the Laundry is on the drum jacket, and this drum operation through several reversing phases during which the laundry is circulated to interrupt. This is supposed to be achieved that a washed laundry item can be dried in one operation.

Furthermore, DE-OS 19 24 961 Drum drive method become known, in which also the Drum driven at one speed with the laundry lying on the drum jacket, interrupted by several reversing phases. This Process should be suitable for sensitive Dry fabric types by rubbing between the items of laundry is reduced.

Is particularly disadvantageous in the described Process seen that the laundry during the drying process rests on the drum jacket and the air with a certain overpressure into the drum is.

A uniform air temperature distribution during of the drying process is the concern of Laundry on the drum jacket in the two above Procedure difficult.  

The washer dryer operated with the measure according to the invention have surprising compared to the known methods significant improvements in the drying process reveal. The drying time was compared the previous way of working noticeably shortened. Another Advantage can also be seen in the fact that higher Heating outputs can be used, whereby the rate of evaporation in the laundry bound moisture increases.

An embodiment of the invention is based on the Drawing explained in more detail below.

It shows

Fig. 1 is a drum type washing and drying machine in which the inventive method is applicable, as viewed from the side in section;

Fig. 2 is a speed-time diagram for the drying process.

The laundry drum 3 is rotatably mounted in the tub 1 of the washer dryer 2 . The laundry drum 3 is driven by a drive motor 4 via a belt drive 5 , several speeds being adjustable.

In the lower area of the tub, a heating device 6 is arranged, which serves both for heating the wash liquor in the wash cycle and for heating in the drying cycle. By irradiating the rotating laundry drum 3 required for the drying process heat is supplied.

The steam expelled from the laundry is passed into a condensation device 7 for condensation.

Fig. 2 shows a speed-time diagram of a method according to the invention. Here, in the drying program with the heater 6 switched on, the laundry drum 3 is first moved at the normal laundry circulation speed n 1, which is generally around 50 rpm. After the time t ₁, the speed of the drum 3 is briefly accelerated to an intermediate spin speed n ₂ for the period t ₂ and then returned to the normal laundry circulation speed n ₁. This process can be repeated several times in the drying operation and can also be provided at least once in the subsequent cooling phase with the heating switched off.

The advantageous in the method described above Speeds and times may vary depending on the circumstances of the washer dryer may be different.

Have a washer dryer with a 5 liter drum z. B. the following ranges for the speeds and times proven to be cheap:

• n ₁ = 50 rpm, t ₁ = 3-10 min
• n ₂ = 200-450 rpm, t ₂ = 5-30 sec

With the method according to the invention, an additional Blowers for air circulation can be dispensed with and still work with higher heating outputs. It automatically turns into a uniform in the system Air and temperature distribution, whereby the Drying process is significantly favored.

Claims (3)

1. A method of operating a drum type washing and drying machine during the drying process, in which the laundry drum with Wäscheumwälzdrehzahl and at a speed bie which abuts the laundry against the drum casing, is driven thereby, characterized in that the laundry drum during the predominant period of the drying process with the Laundry circulation speed is driven, brought to an intermediate spin speed at least once briefly and is then driven again with the laundry circulation speed. 2. The method according to claim 1, characterized in that that the laundry drum also in the cooling phase heating switched off briefly at least once is brought to the intermediate spin speed. 3. The method according to claim 1 or 2, characterized by the repeated application of the following drum drive period:

• - Laundry circulation speed approx. 50 rpm for a period of 3-10 min.
• - intermediate spin speed between 200 and 450 rpm for a period of 5-30 sec.