DE2044478A1 - Dishwashing method and device for washing machines - Google Patents

Description

Patent attorneys. -

DipUng. C. Wallach ίί Ζ 8 3 4

Dipl. Ing. G. Koch 2044Ä78

Dr. T. Haibach. * U4 «m / 0-

a Munich .2 I 8, Sep. 1970

Kaufingerstr. 8, Tel. 240276

INDUSTRY A.ZANUSSI S.p.A. - Pordenone / Italy,

Washing method and device for washing machines.

The invention relates to an improved rinse cycle for washing machines and a device for performing the same.

In standard washing machines this gets into the fabric Detergents that have penetrated the laundry during the wash cycle are generally washed down in a multi-stage rinse cycle simultaneous back and forth rotation of the laundry container removed, whereby by the time control device several times in succession (usually four to six times) full water supply and drainage is controlled. In this way a satisfactory rinsing of the laundry is achieved, wherein however, you have to accept the disadvantage that this takes a relatively long time and consumes considerable water is needed. The rinse water is namely after each one

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"Rinsing stage drained completely in order to dilute and discharge the detergent retained in the laundry. ₀ Furthermore, there are dead times between each flushing water drain when the following water inflow into the tub.

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The invention is intended to implement a flushing method, that takes less time than with the previously known washing machines. Furthermore, this rinsing process should require a smaller amount of water than before.

According to the invention, the problem is solved by means of a flushing process solved, which consists in the fact that after draining the detergent solution into the tub of the washing machine water up to a first predetermined level is admitted that the mopping container is alternately rotated back and forth and at the same time more water until a second predetermined one is reached Levels is admitted that any number of times water between this second and a lower lying third level is removed and approved, the laundry container is alternately rotated back and forth on the same side, and that finally the water is completely drained from the tub of the washing machine.

This method according to the invention is carried out with the aid of a device which has a first water level regulator, which consent is given upon reaching a first predetermined level of the water admitted into the tub through an inlet valve for alternating back and forth rotation of the laundry container,

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and a second water level regulator, which at Reaching a second level above the first level certain level closes the water inlet valve and sets the drain pump in operation to partially drain the water to bring about until a third predetermined level is reached, in which the second water regulator is the drain pump stops and the inlet valve opens again. ·

Further characteristics, purposes and advantages of the invention result can be derived from the following description of an exemplary embodiment, reference is made to the drawing in which

Figo 1 shows the overall electrical diagram of the device according to the invention and

the Fig.2-6 the device in different operating phases for Illustrate the execution of a complete rinse cycle.

The device shown in Figure 1 comprises two water level sensors 10 and 11 (which preferably consist of ordinary pressure switches), each of which has a movable contact 12 or 13, which is suitable depending on the water level one of two different ones in the tub of the washing machine To take up work positions. In particular, the sensor 10 is such calibrated that its movable contact 12 then reaches the position in which it connects two fixed contacts 14 and 15 together when the water level in the tub is a first predetermined Level reached (which corresponds to such a water level

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can speak g feel which the rotation of the wash basket no damage to the laundry contained therein give rise), while the movable contact 12 with an empty pan (or _e is at least with a very low water level in the tub) into that position in which it two fixed contact 14 and l6 connects together. The sensor 11, however, is calibrated in such a way that its movable contact 13 comes into a position in which it connects two fixed contacts 17 and 18 to one another when the water level in the tub reaches a second, higher predetermined level, while the movable contact 13 moves into one second position in which he has two fixed cones bars 17 and 19 connects when the water in the tub sinks below a predetermined third level, which is close to the first-mentioned level. As will be explained in more detail below, this third level can be higher or lower than the first. It only has to be of such a height that the laundry container can be rotated without the risk of damaging the laundry contained in it.

The two sensors 10 and 11 are in an electrical circuit, which is fed via two lines 20 and 24 and also the drive motor 35 of the time control device of the Ma ~ machine ^ the drive motor 29 of the laundry basket, an electric valve 23 to the water inlet in the washing tub and a drain pump 28 includes. The fixed contacts 14 and 17 of the two Sensors are directly connected to the feed line 20, while the fixed contacts 16 and 19 with each other and with a movable contact 21 are connected, which is actuated by a cam of the timing device

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and a fixed contact 22 cooperates, which is connected to the line 24 via the solenoid valve 23. The fixed contact 15 of the sensor 10 is in turn connected to a movable contact 30 which is actuated by a slow cam of the timing device and cooperates with a fixed contact 31 which is connected to a movable contact 32 which is actuated by a rapid cam of the timing device and works with two permanent contacts 33 and 3.4. The latter two contacts are connected to the line 24 via the windings of the motor 29, the two motor windings being arranged in such a way that the rotation of the motor is caused in one direction of rotation when the contact 33 is fed, while the rotation in the other direction of rotation is caused is caused when the contact 34 is fed. The fixed contact 15 of the sensor 10 is also connected to a movable contact 36 which is actuated by a slow cam of the time control device and cooperates with a fixed contact 37 which is connected to the line 24 via the motor 35. The movable contact 36 is also connected to a further movable contact 38 which is actuated by a slow cam of the timing control device and cooperates with a fixed contact 39 which is connected to the line 20. Finally, the fixed contact 18 of the sensor 11 is connected to a fixed contact 25 which interacts with a movable contact 26 which is actuated by a slow cam of the timing device and which also cooperates with a fixed contact 27 which is located directly on the line 20. The movable one

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Contact 26 is via the drain pump 28 with the line 24 tied together"

The explained arrangement of the cam of the timing device and the calibration of the water level sensor 10 described and 11 call the following operation of the one shown in Fig.l Device emerges,

At the end of the washing cycle and after the discharge of the washing liquor contains the various parts of the apparatus in the state shown in Figure "2 state, _o h", the water level sensor 10 has its movable contact 12 in the position in which the contacts 14 and L6 together are connected, while the movable contact 13 of the water level sensor 11 is in a position in which it connects the contacts 17 and 19 with each other. Contacts and 22, 30 and 31, 32, 33 and 34 are open, while contacts 36 and 37 and contacts 38 and 39 are closed and the changeover contact 26 rests on the fixed contact 27. As a result, the solenoid valve 23 and the motor are located 29 in the idle state, while the motor 35 of the time control device is fed via the closed contact pairs 36 and 37 as well as 38 and 39 and the drain pump 28 via the closed contact pair 26 and 27 »

After draining off the detergent solution, the timer contacts 38 and 39 open, while contacts 30 and 31, 21 and 22, and 25 and 26 are closed (As a result, contacts 26 and 27 are opened). As a result, the timing device is stopped and so is the

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Drain pump 28 stops while the solenoid valve 23 is opened and the water inlet into the tub of the washing machine begins (state according to Fig. 3).

As soon as the water in the tub has reached the level, at which.der sensor 10 switches over, its movable arrives Contact 12 in the position according to FIG Time control device is fed again and the beginning of a Series of Umschaltuijprt the movable contact 32 between the fixed contacts 33 and 34 can control so that the drive motor 29 of the laundry basket is caused to rotate alternately in one direction and in the other direction of rotation.

Despite the fact that sensor 10 has responded, the solenoid valve is activated 23 further fed via the contact 13 of the sensor 11, see above that water continues to be let into the tub. This what- inlet tv is only ended when the highest water level in the tub is reached, so that the WasserstandfUhler 11 responds and switches its movable contact I3 to the position of Fig.5. As a result, the solenoid valve 23 is blocked while the drain pump 28 is operated to remove water from the Lower the tub and vibrate the tub a little. The water drainage is ended when the water level in the Tub has sunk to a level at which the switching of the Wasserstandftthlers 11 is caused «In this state the drain pump 28 is stopped while the solenoid valve 23 is opened again to allow fresh water into the Let in tub.

From that moment on, a series of ab \\ digits takes place Actuation of the solenoid valve and the drain pump and consequently

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its an alternating partial water inlet and outlet the tub, while the laundry basket continues to be turned back and forth alternately. After the lower calibration level of the sensor 11 is close to the upper calibration level of the sensor 10, it is ensured that the laundry basket is never without Vorhan ™ the being of water in the tub rotates »

The alternating partial water inflow and outflow is ended when the time control device enables the return of the movable

^ Chen contacts 21, 26, 30, 32 and 38 in the position according to Fig.2 controls, in which the drain pump 28 remains in operation until the water is completely drained from the tub. The complete Waaserablaß can be preceded by a phase as shown in Fig. 6, in which the laundry basket is alternately rotated back and forth without a partial water supply. and indulgence is evoked »This phase would have the task cause a more effective dilution of the detergent contained in the fibers of the fabrics and could through the Time control device by opening contacts 21 and 22 as well

. 25 and 26 without simultaneous closing of contacts 26 and can be controlled, furthermore, the timing device could do the repetition further alternating water inlets and outlets (FIGS. 4 and 5) and in between each phase according to the one according to FIG. 6 steer,,

The flushing method implemented by the device described is both energetic and delicate Washing programs applicable and especially with the latter

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advantageous because the laundry is subjected to a low mechanical effect during the washing cycle. Rinsing the This is because washing is always carried out with sufficient water

and

stood in the tub and the dissolution / removal of the detergent is achieved in a continuous progression.

It should be noted that the water level sensors are expedient in this way must be calibrated so that it is prevented that they respond when the water level differences are too small and their movable ones Contacts have excessive discontinuity.

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Claims (1)

204U78 Claims Ι ») Rinsing process for washing machines, characterized in that, that initially let water in the tub of the washing machine until it reaches a first predetermined level is that the laundry basket is alternately rotated back and forth, while at the same time continue to water until reaching a two- ™ th predetermined level is admitted, that then alternately water is partially withdrawn and admitted again, so that the water level in the tub is between the second predetermined level and a third lower predetermined level The level fluctuates and that eventually the water is completely drained 2 «Method according to claim 1, characterized in that after the alternating partial water drainage and supply and before the final complete drainage of the laundry basket is alternately rotated back and forth at ^ Koniantem water level. 3. The method according to claims 1 and 2, characterized in that the phase of the alternating partial water abundance allowance is repeated several times, with a phase of alternating rotation of the laundry basket in between is carried out at a constant water level. -10- 109830/1 U2 204U78 Αλ 4ο Device for carrying out the method according to Claims 1-3, characterized by a first water level regulator, which consent · to the alternate rotation of the Laundry basket then there when that through an inlet valve in the tub taken in water a first predetermined level achieved, as well as by a second water level regulator, the after reaching a second, higher predetermined water inlet level (s) The tub closes the valve and the drain pump starts operating to partially drain the water until it is reached bring about a third predetermined level at which the second water level controller stops the drain pump and the inlet valve opens again. 5. Apparatus according to claim 4, characterized in that there are switching contacts in the electrical feed circuits of the inlet valve and the drain pump, which are opened by the time control device of the machine after a predetermined time in order to terminate the alternating actuations of the inlet valve and the drain pump _o - 6 β device according to claims 4 and 5, characterized in that that the drain pump has an electrical feed circuit in which a Schaltkoiiakt is located on the part of the Zext control device of the machine according to a predetermined Time is closed to cause the final complete drainage of the tub. -11- 109830/1142