ES2245926T3 - OPTIMIZATION PROCEDURE OF THE OPERATING CYCLE OF A DISHWASHER AND DISHWASHER THAT USES THIS PROCEDURE. - Google Patents

Abstract

Optimization procedure for the operation cycle of a dishwasher that includes a tank (3) filled with liquid from a water intake, which includes a wash cycle (c1), followed by a rinse cycle (CR), characterized in that it includes the following steps: - measurement of the amount of water remaining (Qi) in the tank after an emptying operation (V) at the end of the wash cycle (C1); and - programming at least one supplementary rinse (Ri1, Ri2) in the rinse cycle (CR) when said amount of water remaining (Qi) is greater than a threshold value (QS1).

Description

Cycle optimization procedure operation of a dishwasher and dishwasher that uses this process.

The present invention relates to a dishwasher equipped with a control procedure of the washing bath that the rinse cycle is optimized.

In general, it may happen that in the During an operating cycle of this type of device, the wash quality degrades occasionally and randomly without The user can attribute a cause. It is mainly the case if an excessively large amount of foam due to the washing product It develops during the wash cycle. This may occur in case of detergent overdose or if a untimely combination of certain detergents with a certain type of food waste; can be treated by example of certain detergents with a significant amount of yolk.

The current programming procedures of the wash and rinse cycle (see for example DE-A-19638514) are based on the measure of a society degree. This measure can be carried out by water turbidimetry using optical means, but to solve the problem mentioned above this type of measure is not adapted, since the foam that forms and has then problems to be evacuated during emptying catches an amount of dirt difficult to detect by turbidimetry.

This is why the invention does not seek to measure the water turbidity during washing and even less in the rinse next, but proposes to measure the residual amount of water at the end wash, which from a certain threshold constitutes the Undoubted indicator that the dilution factor (detergent + micro waste) is not enough to get a wash result irreproachable. In this case, the rinse is automatically increased by one or several rinses.

The interest of adapting the number of rinses in function of a more or less complete emptying parameter at the end the washing cycle also allows to avoid saturation of the usual filters of this type of home appliance.

More precisely the invention has as its object a optimization procedure of the operating cycle of a dishwasher as described in claim 1.

According to a variant of the invention, the measurement of the amount of water remaining at the bottom of the tank is a measure direct by direct manometric height, for example by an analog pressure gauge (piezoelectric or other).

According to another variant, the measurement stage of the amount of water remaining can be effected differentially by measuring the volume of water to contribute at the beginning of the cycle of rinse to reach a volume at the bottom of the tank, standard default.

The measurement can be performed over the time of water supply or be carried out with the help of a flow meter to measure the complementary volume of water to contribute to reach A standard level

The invention also has as its object a dishwasher carrying out the process of the invention.

This device includes a tank filled with liquid from a water outlet that includes a solenoid valve and means for closing the solenoid valve when the amount of water necessary for the operation of the wash cycle or the rinse cycle is equal to a predetermined amount of water and a programmer of the wash cycle and rinse cycle, characterized in that it includes means to measure the amount of water remaining in the tank after an emptying operation end the wash cycle and some means to control the programmer so that you schedule at least one supplemental rinse in the rinse cycle when said amount of water remaining is greater than a threshold value.

For this, any means of precise measurement of the water level, including a pressure gauge or Also a float.

The means for closing the solenoid valve can be of the pressure switch type.

The invention and other advantages will be better understood. will appear with the reading of the following description given by title non-limiting and thanks to the attached figures, among the which:

- Figure 1 represents a schematic view and partial of a dishwasher;

- Figure 2 illustrates the main stages of An example of a method according to the invention.

In general, a dishwasher 1, schematized in Figure 1, includes a wrap or box 2, a Cuba 3 in which dishware baskets 4,5 are mounted, irrigation windlass 6.7 and a water level regulating device 10. This water level regulating device 10 may be constituted, in a known way, by an air pressure switch whose chamber, delimited by a flexible membrane, is attached to the chamber compression, flared, arranged in the device tank home appliance The pressure switch membrane, which moves under the effect of the relative pressure variations of the atmosphere, acts on an electrical contactor that gives the level signal reached to automatism. This level reached is not, on the other part, necessarily chosen to correspond to a volume of water available at the bottom of the tank enough to run the device as normal (or nominal). A variant of the invention, in This case can be: provided that the detection of the level of water is thin enough to control a volume of water precise, compatible with the operating thresholds of the present procedure, you can match the level reached with the volume of water at the bottom of the tank just needed, and enough, for a good functioning of the device. The device water level control 10 thus allows to obtain a well-determined level, necessary for security and safety reasons saving water.

The dishwasher also includes a pump of emptying that allows to renew the liquid in the bottom of the tank. The Bottom of the tank includes a recycling pump equipped with a water guide pipe rejected to the windlass of bottom irrigation and a drain pump attached to a conduction of evacuation. Some filters and micro filters allow water recycling clean to feed the windlasses in a closed circuit that the volume of water introduced from the outside is saved.

In general, wash cycles (water + detergent) and rinse cycles (water only) are sequenced in bathrooms through emptying operations during which it is only The drain pump is activated.

Figure 2 schematizes the main stages of An example of a method according to the invention.

The first stage concerns a standard cycle of wash C 1.

The second stage corresponds to an operation of V emptied from the tank.

The third stage corresponds to the first phase of the rinse cycle C_ {R}, that is to the first operation of Fill the tank with clean rinse water R_ {1}. During this operation, the amount of water required Q_ {N} is measured in parallel to reach the standard amount of water Q_ {R} to contribute to the tank to reach a predetermined standard level N_ {R}. The quantity Q_ {i} = Q_ {R} - Q_ {N} corresponds to the quantity of water remaining in the tank after emptying. If Q_ {i} is higher at a threshold value Q_ {S1}, then the rinse cycle is automatically programmed for a supplemental rinse R_ {i1}.

Classically, the rinse cycle is followed by a drying cycle C_ after a new emptying V. In the if the quantity Q_ {i} is less than the threshold value Q_ {S1}, then the rinse cycle is a standard cycle. He standard rinse cycle may be limited to either a single rinse R 1 as illustrated in Figure 2, either in two phases rinse R_ {1} and R2_. In the latter case, the rinse R2 will be in hot bath.

Also if Q_ {i} is greater than an amount threshold Q_ {S2} higher than Q_ {S1}, can be programmed a second supplementary rinse R_ {i2}.

In the context of the invention, the dishwasher is equipped with a sensor so that the volume is accurately measured of water to be added to the first rinse bath after emptying The last wash bath. Typically, water volumes corresponding to the preset level N_ {R} can, for a dishwasher, staggered from 1 to 6 liters, the threshold Q_ {S1} can be set in an order of magnitude of 0.5 liters and accuracy cumulative of the two measuring means must be better than half of the threshold value, for example ± 0.15 liters for each.

The information provided by the collector report directly to the programmer, who then selects automatically the optimal number of rinses. The collector can be a small flowmeter arranged in the water supply line of the domestic appliance.

Water volume measurement to be added during the first rinse to complete the amount of water until reaching the standard level of the first rinse bath can be performed also thanks to an accountant who reports on the time of water supply, carried out at a regulated flow on arrival of the water. If this time is less than a critical threshold, predefined, the machine automatism triggers in the During the cycle, at least one additional rinse.

Claims (8)

1. Procedure for optimizing the operating cycle of a dishwasher that includes a tank (3) filled with liquid from a water intake, which includes a wash cycle (c_ {{{{}}}), followed by a cycle of rinse (C_ {R}), characterized in that it includes the following steps: - measurement of the amount of water remaining (Q_ {i}) in the tank after an emptying operation (V) at the end of the wash cycle (C 1); Y - programming of at least one rinse supplementary (R_ {i1}, R_ {i2}) in the rinse cycle (C_ {R}) when said amount of water remaining (Q_ {) is greater than one threshold value (Q_ {S1}). 2. Procedure for optimizing the operating cycle of a dishwasher according to claim 1, characterized in that the step of measuring the amount of water remaining (Q_ {) is carried out differentially by measuring the volume of water (Q_ {N }) to be provided at the beginning of the rinse cycle (C_ {R}) to reach a standard predetermined volume (Q_ {R}) at the bottom of the tank. 3. Procedure for optimizing the operating cycle of a dishwasher according to claim 2, characterized in that the differential measurement stage is carried out in the presence of a pressure switch (10) measuring a manometric height of water. 4. Dishwasher (1) that includes a tank (3) filled with liquid from a water intake that includes a solenoid valve and means to close the solenoid valve when the amount of water necessary for the operation of the wash cycle ( C_ {i}) or the rinse cycle (C_ {R}) is equal to a predetermined amount of water and a wash cycle and rinse cycle programmer, characterized in that it includes means for measuring the amount of water remaining (Q_ {i}) in the tank after the emptying operation (V) at the end of the wash cycle (C_ {1}) and means to control the programmer so that it schedules at least one additional rinse (R_ {i1}, R_ {i2}) in the rinse cycle (C_ {R}) when said amount of water remaining (Q_ {) is greater than a threshold value (Q_ {S1}). 5. Dishwasher according to claim 4, characterized in that the means for closing the solenoid valve include a pressure switch (10). 6. Dishwasher according to one of claims 4 or 5, characterized in that the means for measuring the amount of water remaining (Q_) in the tank after an emptying operation (V) at the end of the washing cycle includes means of type of analog pressure gauge. 7. Dishwasher according to one of claims 4 or 5, characterized in that the means for measuring the amount of water remaining (Q_) in the tank after an emptying operation (V) at the end of the washing cycle include means for measure the water feed time of the tank during the first bath of the rinse cycle. A dishwasher according to one of claims 4 or 5, characterized in that the means for measuring the amount of water remaining (Q_) in the tank after an emptying operation (V) at the end of the washing cycle includes a sensor of flow to measure the complementary volume of water (Q_ {R}) to be supplied to complete the volume of the bottom of the tank at a predetermined level (N_ {R}), during the first bath of the rinse cycle.