FR2572429A1 - WASHING MACHINE WITH AUTOMATIC CONTROL. - Google Patents

Abstract

AUTOMATICALLY CONTROLLED WASHING MACHINE INCLUDING A WASHING PRODUCT ADDING DEVICE HYDRAULICALLY CONNECTED TO THE UPPER ZONE OF A LAUNDRY TANK AND THE CONTENTS OF WHICH CAN BE BROUGHT TO THIS LAUNDRY TANK BY THE WATER OF A DUCT. ORDERED FRESH WATER SUPPLY. THE PUMP13, DURING THE DELIVERY AND OR FOR A LAP OF TIME, SHORT IN COMPARISON OF THE DURATION OF THE WASHING PROGRAM, AFTER THE DELIVERY, OF THE CONTENTS OF THE WASHING PRODUCT ADDING DEVICE TO THE LAUNDRY TANK CAN BE TRAINED IN A MANNER THAT THE WATER COLUMN IN THE DRAIN LINE DOES NOT REACH THE SPILL LEVEL.

Description

WASHING MACHINE WITH AUTOMATIC CONTROL.

  The invention relates to an automatically controlled washing machine comprising an addition device of the washing product hydraulically coupled to the upper zone of a laundry tub and whose contents can be brought to this laundry tub by the water from a controlled fresh water supply line, and a drain line connected to the lowest point of the laundry tub, up to the pour level above the highest point of the latter and containing a pump for evacuation

laundry.

  By the German utility model 69 23 774, there is known such a washing machine in which in the

  drain line between the pump and the discharge level

  In addition, there is a bag-shaped enlargement which increases the volume of the water column in the drain line. The purpose of this device is to ensure that at the end of a wash cycle after stopping the pump, a significant portion of this water column flows back into the laundry tub so that the outlet mouth of the the driving

  emptying is covered by an increased amount of water.

  This amount of water collects a large portion of the wash product fed at the beginning of the next wash cycle, prevents it from disappearing into the drain line and can dissolve it. This device known to avoid losses

  washing agent nevertheless has a limitation.

  The bag-shaped enlargement, in addition to the elements of

  additional construction involved, requires an increase in

  the necessary volume in the rear space

  close to the washing machine. Moreover, the result

  tat, as to the reduction of losses in detergent,

is still not satisfactory.

  The object of the invention is therefore to improve

  current washing machines with regard to

  losses of detergent, while avoiding the widening

  Known bags in the drain line

  and without any other mechanical modification.

  According to the invention, this result is achieved by the fact that the pump, during the supply, and / or for the period of time, runs in comparison with the duration of the washing program, after the delivery of the contents of the device. addition of the detergent to the laundry tub, can be driven so that the water column in the drain line does not reach the expected discharge level. This gives the water column potential energy that is sufficient to make it flow back after stopping the pump. It then exceeds its rest position and a portion is forced back into the laundry tub by bringing there at the same time the washing product reached in the drain line. There this part of the water column and washing product that it contains

  mix with the rest of the contents of the laundry tub.

  For this purpose, it suffices that the pump, according to an advantageous feature of the invention, is driven

  at least once during a short period of operation.

  Another advantageous particularity consists in

  drive the pump with reduced drive power.

  It is therefore necessary to ensure that the training power

  be established so that the water column in the drain line does not reach the expected discharge level. In this case, it is not absolutely necessary that a short period of determined operation of the pump

be observed.

  The reduced drive power can also be achieved by running the pump against

  its normal direction of rotation. For this purpose, a simple change

  meaning of the drive motor of the pump in the

control circuit is sufficient.

  In the case of the time limitation of the

  the pump's running time, it turned out to be

  advantageously that this is at most 0.5 s.

  By operating the pump more than once

  consecutively according to a feature also

  In the process of the invention, the probability of an intimate mixing of the initially-obtained washing product is increased accordingly.

  in the drain line with the contents of the laundry tub.

  By allowing downtime between the operating pulses and the natural oscillations of the water column, a continuously oscillating laminar flow can be obtained in the drain line without any of the parts of the water column adjacent to the flow container. The detergent is mixed with remote parts which, even during their reflux, do not reach the laundry tub, so they can not contribute to the recovery of the leftover detergents. The agreement of downtime is

  mainly conditioned by resistance to hearing

  the drain line. Thus, for example, the layout of the discharge hose and the shape of the pump chambers and pallets, as well as the separators of lint or pliers possibly interposed may have a

  considerable influence on the flow resistance.

  According to the experience, the time frame for the functioning

  impulse should not exceed 0.5 s, otherwise the water column would exceed the discharge level

and escape.

  According to another characteristic of the drum washing machine according to the invention, it is particularly advantageous to actuate the drum during the operating interval or intervals. In doing so, the portion of the water column flowing back into the laundry tub is driven by the drum and intimately mixed with the contents remaining in the laundry tub. It is then suddenly avoided that the portion of the water column discharged into the laundry tub stagnates in front of the outlet mouth of the drain line and, during the next pump operation pulse, either

  again sucked into the drain line.

  The invention will be better understood using the

  description of an embodiment taken as an example but

  non-limiting, and illustrated by the accompanying drawing, in which: Figure 1 shows schematically the mechanical parts essential for the invention of a washing machine commercially available; FIG. 2 is an operating diagram for the freshwater solenoid valve, the pump motor and

drum training.

  The washing machine represented comprises in the

  1 of its bodywork a freshwater supply pipe 2 which can be controlled by means of one or more solenoid valves 3. The pipe 2 opens

  in a device 4 for adding the washing product comprising

  so many compartments containing different doses of this detergent. The outlet S of the device 4 is connected to the upper zone of the laundry tank 6 and can let the fresh water arriving flow as well as the dose of the washing product to be added to the laundry tank. A security system, not shown, authorizes the filling

  from the laundry tub 6 up to the overflow level 7.

  In the laundry tub 6, a washing drum 8 is rotatably mounted horizontally. It can be driven in both directions of rotation by a not shown drive system. At the lowest point of the laundry tub 6 is connected an outlet mouth 9 opening into a drain line 10 which has an elastic connection 11 leading to a fixed clamp separator 12 and a pump 13 connected thereto. On the discharge side of the pump, the drain line 10 is extended by a tube

  ascending 14 rising to the height of the level of

  15 to which an exhaust hose 16 is attached to

  outside the boundaries 1 of the bodywork.

  Normally, the liquid in the ascending tube 14 does not rise higher than in the laundry tub 6. But as soon as the pump 13 is routinely driven by its motor 17 in its normal direction of rotation, the liquid rises up to level of discharge 15 and then flows through the

  flexible 16 in an output pipe not shown.

  The operation of the device according to the invention is explained using the diagram of FIG. 2: at the beginning of the cycle of a treatment program by channel

  humid, one activates in the usual way one of the electro-

  valves 3, for example by means of an electromagnet not shown

  sented. As a result, fresh water passes through one of the compartments of the device 4 for adding the detergent and discharges the dose contained therein into the detergent tank. As it is empty so far, the first fresh water with a large part of the dose of the detergent flows to the outlet mouth 9 and from there

in the elastic connection 11.

  Without the invention, this part of the washing product would not participate in the next washing process and, upon completion of the washing, would be removed by the pump without having been used. According to the invention, however, during (FIG. 2) and / or after supplying the fresh water, the pump 13 is actuated at intervals by engaging the motor 17 in an impulse manner so that the water column rise briefly in ascending tube 14, but without reaching spill level 15. This condition

  can be very easily realized by a mode of function-

  in which the reduced power pump 13 is driven, for example by a motor operating with a lack of tension or by turning it in the direction of rotation opposite to its normal direction of rotation. When the pump 13 stops during the interruption of the pulses, the water column refluxes and goes far enough that the part of the water column which, before the operating impulse, is contained in the elastic connection and possibly also in the separator of clamps 12 and carrying with it the "lost" part of the dose of detergent, is discharged from the mouth 9 and reaches the laundry tank 6. There it is mixed with the rest of the content of the

laundry tub.

  If, according to FIG. 2, during the driving intervals of the pump, the drum drive system is additionally turned on, the drum 8 can then pick up the part of the water column that flows back into the drum. laundry and mix it turbulently and intensively with

rest of the content.

  With the duration D1: 0.5 s indicated in FIG. 2 for the operating pulse and D2 = 1.5 s for stopping the pump 13, under the conditions illustrated in FIG. water column of the drain pipe, a clean oscillation which is characterized by a laminar flow in alternating direction. In such a case, it is still only the contents of the zones of the drain line 10-which are close to the laundry tub, namely the contents of the elastic connection 11, which is pushed back into the laundry tub 6 so that the detergent it contains

  added to the rest of the laundry bin contents. With the function

  drum 8, this dose of

  washing is mixed with the rest of the contents of the laundry tub.

  As with the use of an electronic programmer

  magnetic for the washing machine, it is not easy to observe the operating times D1 and stop D2 having the small values indicated, it is recommended to drive the pump 13 with a sufficiently low power so that its flow is not sufficient to raise the water column in the tube 14 to the level of discharge 15. This can for example be done by using electrical provisions for the electric drive motor 17 or mechanical provisions for the 13, for example by appropriate configuration of the pallets during the rotation of the pump in the opposite direction. In this case, the duration of the operating pulse D1 does not matter in

  regarding fluid mechanics if one abstracts

  This is because the pump during operation causes turbulence and mixing in the water column. Despite this, it remains advantageous to give the duration of the shutdown D2 to the natural oscillations of the water column in order to preserve the flow

laminar.

  The flow conditions of the washing machines being of different natures in terms of fluid mechanics, no precise indication can be provided on the duration of the impulse operation of the pump 13 nor on the duration of the driving of the drum. The lines of the diagram in Figure 2 therefore continue with

  dashes to the right. Depending on the case, it is necessary to

  undermine if only a few operating intervals

  are necessary for the pump 13 with operationcorres-

  short duration of the drum, or if a greater number of operating intervals for the pump are required

  with longer actuation of the drum.

Claims (8)

  1. Automatically controlled washing machine comprising an add-on device. a washing product hydraulically coupled to the upper area of a laundry tub and the contents of which can be supplied to the laundry tub by the water of a controlled fresh water supply line, and a connected drain line at the lowest point of the   laundry tub, up to the level of discharge   above the highest point thereof and containing a pump for discharging the laundry, characterized in that the pump (13), during the supply, and / or for a period of time, runs in comparison the duration of the washing program, after the contents of the device (4) for adding the detergent to the laundry tub (6), can be driven in such a way that the water column in the pipe   drain (10) does not reach the discharge level (15).   2. Washing machine according to claim 1,   controlled by the fact that the pump (13) is driven at least   once during a short period of operation (D1).   Washing machine according to claim 1 or 2, characterized in that the pump (13) is entrained   with reduced drive power.   4. Washing machine according to any one of the   I to 3, characterized in that the pump (13)   is driven against its normal direction of rotation.   Washing machine according to Claim 2 or 4, characterized in that the operating time (D1) is not more than 0.5 s.   6. Washing machine according to any one of the   1 to 5, characterized in that the pump (13)   is driven more than once consecutively (Figure 2).   Washing machine according to claim 6,   characterized by the fact that the stopping times (D2) between the operating pulses are tuned to the natural oscillations of the water column.   8. Drum-washing machine according to any one   Claims 1 to 7, characterized in that the   drum (8) - from the washing machine is also driven   during the operating interval (s) (D1 + D2).