DE3501760A1 - Method and apparatus for washing laundry in a drum-type washing machine - Google Patents

Abstract

What is indicated is a washing method for a drum-type washing machine, in which, in the initial phase, the washing fluid is pumped into the tub by circulation via a spray nozzle by means of a pumping device, while the drum is being operated at a stand-by speed. In a second washing phase, washing is then continued at the normal washing rate with an increase in the water level.

Description

Method and apparatus for washing

Laundry in a drum washing machine The invention relates to a method and an apparatus for washing laundry in a drum washing machine.

There are a number of different washing methods known that all essentially aim at using the washing process in a washing machine As little water as possible and with little use of energy run off permit. (DE-OS 33 08 611, EP-PS 43 122) The disadvantage of the one in DE-OS 33 08 611 consists in particular in the one for the effective implementation elaborate drum construction. The method proposed in EP-PS 43 122 on the other hand, contains some procedural steps that have a wide range of applications, e.g. for household washing machines, can hardly be carried out.

The invention is based on the object of a method and a device to create laundry washing that requires drastic use of water and energy can be lowered and which in a conventional household washing machine in relatively simple form can be realized.

The solution to this problem is characterized by that in the main claim Features achieved. Further features and configurations of the invention result from the following subclaims.

An embodiment of the invention is purely schematic in the drawing and is explained in more detail below.

The drum washing machine 1 shown has the usual arrangement from suds container 2 and the drum 3 stored in it. There is one in the drainage system Arranged pumping device 4, through which the water in the usual way via a Drain hose 5 can be conveyed out of the machine. With a corresponding Reversing device, it is equally possible, the accumulating in the process Liquid through a flow heater 6 and one directed into the interior of the drum To pump spray nozzle 7 in the circuit. Of course, separate pumps can also be used are provided. Corresponding connection devices are located in a drain part 8 for temperature, water level and caustic concentration sensors 9,10,11 arranged.

In the embodiment shown, the spray nozzle 7 is in the area of Infeed opening 12 of the machine housed.

The detergent is available in liquid or powder form on the Induction bowl 13 passed into the tub 2. The incoming crowd will limited to a low level 14, so that located in the drum 3 Do not immerse laundry in the free liquor.

The highly concentrated detergent solution then located in the tub 2 is via the pumping device 4, the flow heater 6 and the spray nozzle 7 in sprayed the inside of the drum. The drum is at least running at the applied speed (80 rpm) operated, during which a laundry ring forms on the drum shell.

A drum speed is advantageously depending on the dependency the type of laundry in the range between 150-400 rpm. chosen. Detergent or water are demanded, as it is in the area of the low level 14 to the functionally appropriate Pumping the detergent solution is necessary. A water level sensor 10 monitors while the water level.

In the water heater 6, the detergent solution is on the necessary Program temperature brought. For better moisture penetration and better distribution the To achieve laundry, the idle speed is set several times by switching to one reversing wash cycle interrupted.

After the required program temperature has been reached and after the end Fresh water is additionally fed into the tub after a predetermined period of time, until the usual washing level 15 is reached. Now the drum just becomes continue to operate in the usual way with the wash cycle speed for a certain time, until the actual washing process is then ended by pumping and spinning. The subsequent rinsing can then be carried out in the same way as the wash cycle will. An alkali concentration sensor 11 allows the rinsing process to be carried out as long as until the alkali concentration has dropped below a certain value.

Of course, it is also possible to program the rinse depending on the program Combined type of laundry or alternatively carried out with the otherwise usual dipping process.

An advantageous arrangement of the water heater 6 consists in that it is arranged below the tub 2 with an inclined slope upwards is, wherein its upper edge runs approximately in the line of the low level 14.

In a preferred embodiment, a drainage part is used in the drainage system of the machine 8 is provided, to which the condition sensors can be connected. One Prevents the self-cleaning filter device in the circulation system, which is known per se, that the spray nozzle 7 can become clogged with laundry fluff or the like.

Further refinements are also conceivable within the scope of the invention. For example, the highly concentrated detergent solution can be pre-mixed the spray nozzle 7 are supplied directly before then subsequently the one described above Pumping circuit begins.

It makes sense to carry out the washing process using the so-called lye process.

Claims (7)

Claims 1. A method for washing laundry in a drum washing machine characterized by the following process steps: - a highly concentrated detergent solution is fed to the laundry via a spray nozzle (7) directed into the interior of the drum, - The drum (3) is in one direction with at least the application speed and higher operated, - until the detergent solution in significant quantities is ejected and a certain free fleet with a low level (14) forms in the drain sump of the machine - that after reaching the predetermined free Float a pumping device (4) the liquid that collects in the sump via a Flow heater (6) of the spray nozzle (7) supplies in circulation, - that the drum barrel interrupted several times with the applied speed by switching to the reversing wash cycle will, - that after reaching the program temperature by adding Water the suds level is brought to a higher level (15) at which the laundry can immerse in the lye, - that over a certain period of time the drum with the washing cycle speed is driven, and - that the washing process by the subsequent Spin and pumping off the wash liquor is ended. 2. A method for washing laundry according to claim 1, characterized in that that when rinsing fresh water also only runs up to the low level (14) and is fed in circulation through the spray nozzle (7) of the laundry, and that this process with repeated pumping until the lye concentration falls below one certain value has decreased. 3. A method for washing laundry according to claim 1, characterized in that that the rinse cycle is carried out in the immersion process, depending on the program. 4. A method for washing laundry according to claim 1, characterized in that that the speed of the drum depending on the type of laundry when feeding the concentrated Detergent solution through the spray nozzle in a range between 80-400 rpm. controlled will. 5. Apparatus for performing the method according to claim 1, characterized characterized in that the one arranged between the pumping device (4) and the spray nozzle (7) Flow heater (6) below the tub (2) with an inclined slope is arranged at the top so that its upper edge is up to approximately the line of the low level (14) is enough. 6. Apparatus for performing the method according to claim 1, characterized characterized in that the connections for the state-dependent in a drain part (8) Monitoring elements (9,10,11) such as temperature, water level and alkali concentration sensors are arranged. 7. Apparatus for performing the method according to claim 1 and 5, characterized in that a self-cleaning known per se in the drainage system Filter device is attached.