KR20110046177A - Dish washer and controlling method for a dish washer - Google Patents

Abstract

PURPOSE: A dish washer and a control method of a dish washer is provided to improve drying and rinsing performance by sensing the lowering of the temperature of washing water in a rinse process. CONSTITUTION: A control method of a dish washer comprises the following steps. The washing water is heated to the preset temperature by a heater, and the heater is turned off(S1, S2, S3). The heated washing water is sprayed to the washing tub, and the set tableware is rinsed. The washing water is sprayed, and then the temperature of the washing water is compared with the set temperature(S4, S5). When the temperature of the washing water is below the preset temperature, the heater is operated again, and the washing water is heated to the preset temperature(S7). The preset rinse cycle time is increased after the washing water is heated to the preset temperature washing water(S8).

Description

Dish Washer and Control Method of Dish Washer {DISH WASHER AND CONTROLLING METHOD FOR A DISH WASHER}

The present invention relates to a dishwasher and a control method of the dishwasher.

The dishwasher is a device capable of washing dirt on the surface of the dishware by spraying high-pressure washing water onto the dishes contained in the washing tank. In general, a dishwasher forms an exterior and provides a space in which dishes are placed, a rack located within the main body, a rack for placing dishes, a spray nozzle for spraying the washing water at high pressure onto the dishes mounted on the rack, and storing the washing water. Includes sump and wash pumps and wash motors.

In the dishwasher, the dish is washed and dried through a washing stroke for washing dishes with washing water including detergent, a rinsing stroke for rinsing the washed dishes, and a drying stroke for drying the rinsed dishes.

Here, the rinsing stroke is used after heating the washing water, and for this purpose, the washing water heater is included, and whether the heated washing water is heated to a preset temperature is checked through a temperature sensor. In detail, the process of the rinsing process is performed in advance, first, before the rinsing process is started, the washing water is heated and then heated above the set temperature to stop the operation of the washing water heater and supply the washing water.

The washing motor is operated in such a state that the heated washing water is supplied, and then the rinsing stroke is performed for a predetermined time, and then the drying stroke is performed.

However, in the case of the conventional dishwasher having the above washing process, there is a problem that the drying performance after the drying stroke is poor. In order to solve this problem, there have been attempts to increase the drying performance by increasing the temperature of the hot air supplied in the drying process or by increasing the drying time. In this case, it was possible to satisfy the drying performance, but it also has the disadvantage that the washing time is longer or the energy consumption is increased.

The present invention has been made to overcome the disadvantages of the prior art as described above, and the technical problem is to provide a dishwasher that can improve the drying performance and at the same time improve the rinsing performance.

Another object of the present invention is to provide a control method of a dish washing machine that can improve drying performance and rinsing performance.

According to an aspect of the present invention for achieving the above technical problem, a washing tank for providing an internal space in which the tableware can be mounted; Located in the washing tank, the rack for mounting the object to be washed; Spraying means for spraying the washing water to the object to be cleaned mounted on the rack; Located in the lower portion of the washing tank, the sump for storing the washing water; A heater for heating the washing water in the sump; Temperature sensing means for measuring a temperature of the washing water; And a controller for controlling the operation of the spraying means, wherein the controller determines a rinsing stroke time at the time of entering the rinsing stroke, and measures the temperature of the washing water after a predetermined time has elapsed after the rinsing stroke is started. When the temperature is lower than the set temperature is provided a dishwasher, characterized in that for restarting the heater.

In the rinsing stroke, in order to increase the rinsing property and shorten the drying time, the washing water is heated and used during the rinsing stroke as described above. The present inventors have studied that the relationship between the temperature of the wash water and the rinsability and drying time has been found that maintaining the temperature of the wash water has an important effect on the improvement of the rinsability and shortening the drying time.

In particular, in the process of rinsing by heating the washing water to the set temperature and then rinsing it, the heated washing water is introduced into the washing tank due to heat loss through heat exchange between the air remaining in the washing tank and the outside air before the washing water is added. I found that it goes down below. As a result, the temperature of the washing water used in the actual rinsing stroke is lower than the set temperature, so that the temperature inside the washing tank and the surface of the dish at the time when the drying stroke starts are lower than the intended temperature. Due to this, the drying performance is insufficient, and even in the rinsing process, it was found that the rinsing performance is also lowered due to the increase in the surface tension of the detergent due to the temperature drop.

The present invention was derived based on the results of the inventors of the present invention, after heating the washing water to the set temperature in the existing rinsing stroke, improved after not considering the temperature drop thereafter, after entering the rinsing stroke After a predetermined time elapses, the temperature of the actual washing water is measured, and the heater is restarted to compensate for the temperature drop.

At this time, the control unit for controlling the operation of the dishwasher performs a rinsing stroke during the rinsing stroke time set in advance before the rinsing stroke, or during the rinsing stroke time determined by the control unit, if the temperature of the wash water in the rinsing process rinsing Increasing the stroke time improves the rinsing performance while increasing the surface temperature of the dish to improve the drying performance.

In this case, the controller may measure the temperature of the washing water after a predetermined time elapses or periodically at a predetermined time interval.

Here, such wash water temperature compensation is not necessarily limited to the rinsing stroke, but may be applied to any stroke using heated wash water. Therefore, according to another aspect of the invention, the washing tank for providing an internal space in which the tableware can be mounted; Located in the washing tank, the rack for mounting the object to be washed; Located in the lower portion of the washing tank, the sump for storing the washing water; A heater for heating the washing water in the sump; Temperature sensing means for measuring a temperature of the washing water; And a control unit controlling the operation of the spraying means, wherein the control unit measures the temperature of the washing water heated during the dish washing stroke and restarts the heater when the temperature is lower than a preset temperature. Is provided.

Here, the dish washing stroke refers to any stroke that uses heated wash water during the operation of the dish washing machine.

According to another aspect of the invention, the step of heating the washing water to a set temperature using a heater and then turning off the heater; Spraying the heated washing water into the washing tank to perform a rinsing stroke on the tableware; Comparing the temperature of the washing water with a set temperature after a predetermined time elapses after spraying the washing water; And restarting the heater when the temperature of the washing water is lower than the set temperature, thereby heating the washing water inside the washing tank to the set temperature.

Here, the step of setting the rinse stroke time during the rinse stroke; And increasing the set rinsing stroke time after the step of heating the washing water to the set temperature.

In addition, the rinsing stroke time is previously set, and may further include increasing the set rinsing stroke time after the step of heating the washing water to the set temperature.

According to aspects of the present invention having the above configuration, it is possible to maintain a sufficient temperature by detecting that the temperature of the washing water is lowered during the rinsing stroke, thereby improving rinsing properties and drying performance.

Hereinafter, with reference to the accompanying drawings will be described in detail an embodiment of a dish washing machine and a control method of the dish washing machine according to the present invention.

1 is a view schematically showing a dish washer according to an embodiment of the present invention. Referring to FIG. 1, the dishwasher 100 according to an embodiment of the present invention includes a washing tub 110 installed in a cabinet 101, a door 102 opening and closing the washing tub 110, and the washing tub ( It is installed in the 110 and includes a rack 103 for storing the dishes.

In addition, the dishwasher 100 is installed in the lower portion of the washing tank 110, the sump 106 for receiving the washing water therein, the impeller 107 for pumping the washing water in the sump 106, and the impeller And a cleaning motor 108 to drive 107.

In addition, the dishwasher 100 may include a nozzle device 105 and a rotating nozzle 104 in which the washing water pumped from the sump 106 is injected into the dishware that is the object to be washed. The nozzle device 105 is fixed to the rear side of the washing tank 110, to spray the washing water to the dishes. Then, the rotary nozzle 104 is rotated by the injection pressure of the washing water in the lower side of the rack 103, and sprays the washing water to the dishes. By spraying the washing water, dirt on the dishes can be removed, and the dishes can be washed.

On the other hand, a heater 120 for heating the washing water stored in the sump is installed inside the sump 106, and a temperature sensor 122 for measuring the temperature of the washing water on an opposite side of the heater 120 is provided. It is installed. Here, the temperature sensor 122 is located on the opposite side of the heater in order to prevent the heater 120 from affecting the temperature measurement. In addition, the temperature sensor 122 is connected to a controller (not shown) and transmits the measured result to the controller.

The embodiment having such a configuration works through the following process.

First, the user opens the door 102 of the dishwasher and pulls the rack 103 out of the washing tank. After storing the dishes in the rack 103, the door 102 is closed and power is applied to the dish washing machine.

On the other hand, when power is applied to the dishwasher and the washing step is performed, the washing water delivered from the water supply is introduced into the sump 106. After a certain amount of washing water flows into the sump, the washing motor 108 is operated.

As the impeller 107 connected to the motor 108 is rotated, the washing water is alternately pumped to the nozzle device 105 or the rotating nozzle 106 and sprayed into the washing tank. In addition, the dishes stored in the rack 103 are washed by the sprayed washing water.

In addition, the dirty washing water collected in the sump 106 in the washing step is filtered foreign matter by a filter (not shown). In addition, the washing water filtered with foreign matter is discharged to the outside of the dishwasher through a drain pump (not shown).

In addition, when the washing water is discharged to the outside, clean washing water is introduced into the sump 106 again through an inlet, and sprayed through the nozzle device and the rotating nozzle in the same manner as the washing step. In addition, the dish is subjected to a heating rinse stroke by the sprayed clean washing water. At this time, the heater 120 is operated to heat the washing water to a preset temperature, for example, 65 ° C., and then perform a heating rinse stroke for a preset time, for example, for 5 minutes. After the heating rinsing step is completed, the washing operation is completed by going through a drying step.

2 is a block diagram schematically showing the configuration of the embodiment. Referring to FIG. 2, the controller 140 checks the temperature of the washing water measured by the temperature sensor 130 and then controls whether the heater 120 is operated by comparing the measured temperature with a set temperature. In addition, the cleaning process is controlled according to the operation mode determined through the operation panel 150 installed on the front of the cabinet 110, the operation panel 150 allows the user to select the cleaning process (Not shown) are provided. In this way, the user can arbitrarily set the time of the rinsing stroke or use the control unit to quickly determine the time.

During the rinsing stroke time set or determined in this way, the controller 140 performs the rinsing stroke while controlling the operation of the washing motor 108.

3 is a flowchart illustrating an embodiment of a method for controlling a washing machine in a rinsing stroke. When the washing stroke is completed, the control unit 140 operates the heater 120 to heat the washing water to a predetermined temperature (here, about 65 ° C.) (step S1). Thereafter, the temperature of the washing water is measured to check whether the temperature is equal to or higher than the set temperature (step S2). If the set temperature is satisfied, the process proceeds to step S3 to turn off the heater and start the rinsing stroke by operating the washing motor.

At about 2 minutes after the step S3 (S4), the control unit 140 checks the temperature of the washing water once again (step S5). This is because the temperature of the washing water supplied at the start of the rinsing stroke may be lowered due to the heat exchange between the air and the outside air existing in the washing tank, and if the temperature is higher than the set temperature, the rinsing stroke is performed for the remaining time. The rinsing stroke is terminated (step S6). Here, the step S4 does not necessarily need to be performed at the time 2 minutes have elapsed, and may be performed at any time within a predetermined or set rinsing stroke time. In addition, an example in which a predetermined period is repeatedly performed may be considered.

On the other hand, when the temperature of the washing water is lower than the set temperature in the step S5 to operate the heater again (step S7). After confirming whether or not the temperature of the washing water is heated to the set temperature (step S8), the controller extends the rinse stroke time that was initially set or determined (S9). This is to prevent the temperature of the dishware from being lowered to such an extent that the rinsing water cooled during the rinsing cycle cannot sufficiently obtain sufficient rinsing properties and drying performance. It is to raise the temperature of tableware enough.

In other words, if the temperature of the wash water is too low during the rinsing process, the surface tension of the detergent or rinse remaining on the surface of the dish increases, so that it is not easily removed from the surface of the dish, so that the rinsing performance is likely to decrease, and the temperature of the surface of the dish is low. Therefore, when the drying stroke is performed only for a predetermined drying stroke time, the tableware is not sufficiently dried.

After extending the set time as described above, the operation of the heater is stopped (step S10), and when the extended set time elapses (step S11), the rinsing stroke is finished and the drying stroke is performed. Here, steps S9 and S10 may be performed in a reversed order. In addition, the degree of extending the rinsing stroke time can be easily set by those skilled in the art in consideration of the capacity of the dishwasher and the heating performance of the heater. In some cases, sufficient drying performance can be obtained without extending the rinsing stroke time. In such a case, it is also possible to proceed without extending the step S9, that is, the rinsing stroke time.

4 is a flowchart illustrating still another embodiment of the control method. Steps S1 to S8 in FIG. 4 are the same as the example shown in FIG. 3, and thus redundant descriptions thereof will be omitted. In FIG. 4, when it is detected that the temperature of the washing water is lower than the set temperature in the rinsing process, the temperature of the washing water is heated above the set temperature through the step S8, and then the rinsing stroke is performed during the initially set rinsing stroke time. Then, after the set time has elapsed (step S22), if the temperature of the washing water is measured again and measured to be higher than the set temperature, the rinsing stroke is terminated, and if the temperature is lower than the set temperature, the heater is operated again (step S23). The temperature is again heated above the set temperature (step S24).

That is, in the above embodiment, by measuring the temperature at 2 minutes after the start of the rinsing stroke and at the end of the rinsing stroke, when the temperature of the washing water is detected by measuring the temperature of the washing water at the end of the rinse stroke, the washing water is heated again to set the temperature. After the above heating, the heater is terminated (step S25), the rinse stroke time initially set is extended (step S26), and when the extended rinsing stroke time elapses (step S27), the rinse stroke is terminated.

1 is a partial cutaway view schematically showing the internal structure of an embodiment of a dishwasher according to the present invention.

2 is a block diagram showing the configuration of the embodiment shown in FIG.

3 is a flowchart illustrating a control method in the embodiment shown in FIG. 1.

4 is a flow chart showing another example of a control method in the embodiment shown in FIG.

Claims (8)

A washing tank providing an inner space in which the dishes can be placed; Located in the washing tank, the rack for mounting the object to be washed; Spraying means for spraying the washing water to the object to be cleaned mounted on the rack; Located in the lower portion of the washing tank, the sump for storing the washing water; A heater for heating the washing water in the sump; Temperature sensing means for measuring a temperature of the washing water; And A control unit for controlling the operation of the spray means; comprising a dishwasher, The control unit determines a rinsing stroke time at the time of entering the rinsing stroke, and after the predetermined time has passed after the rinsing stroke is started measuring the temperature of the washing water, the dishwasher, characterized in that for restarting the heater. The method of claim 1, And the controller increases the set rinsing stroke time when it is detected that the temperature of the washing water is lower than or equal to the set temperature during the rinsing stroke. The method of claim 1, The control unit detects the temperature of the washing water when the set rinsing stroke time elapses, and when it is detected that the temperature is lower than the set temperature, the dishwasher, characterized in that to increase the rinsing stroke time and restart the heater. A washing tank providing an inner space in which the dishes can be placed; Located in the washing tank, the rack for mounting the object to be washed; Located in the lower portion of the washing tank, the sump for storing the washing water; A heater for heating the washing water in the sump; Temperature sensing means for measuring a temperature of the washing water; And A control unit for controlling the operation of the spray means; comprising a dishwasher, The control unit measures the temperature of the washing water heated during the dish washing stroke, the dishwasher, characterized in that for restarting the heater when the temperature is lower than the set temperature. The method of claim 4, wherein The control unit dishwasher, characterized in that for increasing the preset washing stroke time when the temperature of the washing water is below the set temperature. Heating the washing water to a set temperature using a heater and then turning off the heater; Spraying the heated washing water into the washing tank to perform a rinsing stroke on the tableware; Comparing the temperature of the washing water with a set temperature after a predetermined time elapses after spraying the washing water; And If the temperature of the washing water is below the set temperature, restarting the heater to heat the washing water in the washing tank to the set temperature; Control method of a dishwasher comprising a. The method of claim 6, Setting a rinse stroke time when the rinse stroke is in progress; And And increasing the set rinsing stroke time after the step of heating the washing water to the set temperature. The method of claim 6, The rinsing stroke time is previously set, and further comprising the step of increasing the set rinsing stroke time after the step of heating the washing water to the set temperature.

Images