KR101455986B1 - Dish washer and method for controlling thereof - Google Patents

Abstract

The present invention relates to a dishwasher, and more particularly, to a dishwasher including a tub forming a space in which a tableware is washed; A sump receiving wash water supplied to the tub; And a heater for heating the washing water accommodated in the sump to supply the turbo steam.

According to the present invention, it is possible to easily remove the food waste attached to the utensil by supplying steam to the tub in which the utensil is housed, and sterilization treatment of the utensil and the tub is also possible. Further, since it is not necessary to provide a separate heater, a water supply device, and a nozzle for supplying the steam, it is easy to manufacture and the cost can be greatly reduced.

Dishwasher, Steam, Heater

Description

DISH WASHER AND METHOD FOR CONTROLLING THEREOF [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dishwasher, and more particularly to a dishwasher capable of further improving the washing performance of a dishware.

A general dishwasher is a device for washing foreign matter such as food waste attached to the surface of a tableware by spraying high-pressure washing water to a tableware stored therein.

The dishwasher includes a water supply device for supplying wash water from the outside and a drain device for discharging the wash water back to the outside. In the dishwasher, a tub is formed to receive a dishwasher, and a washing water is sprayed to the tub at a high pressure.

The washing water injected into the tub is collected by a sump provided on the lower side of the tub, and the foreign substances contained in the washing process are crushed and filtered. Then, the dishware is washed while forming a circulating flow path which is pumped upward by the driving unit and sprayed to the tub through the spraying arm.

In order to improve the washing performance of such a dishwasher, various measures have recently been proposed. Particularly, the dishwasher is divided into the preliminary washing and main washing, and the washing water is sprayed in the preliminary washing section, thereby allowing the food waste attached to the dish to be called so that the dishwasher can be easily washed during the washing . In addition, a dishwasher is also provided that supplies detergent to the washing water so that the food waste falls off smoothly, and irradiates ultraviolet rays to the dishwasher to clean the dishwasher.

However, the conventional dishwasher has a problem that the cleaning efficiency can not be sufficiently increased despite the above-mentioned improvement. Especially, when the food is left for a long time after using the tableware and the food is attached to the tableware in a dry state, it is not easy to remove it by merely spraying the high-pressure washing water.

In order to overcome the above-mentioned problems, the above-mentioned problems can not be completely solved even if the preliminary washing is carried out as described above. In addition, it takes a long time to perform the above-mentioned function, and thus the cleaning stroke is long.

Further, when the used dishware is left for a long time and the bacteria propagate, it is not easy to remove it by the conventional dishwasher. Of course, although a dishwasher for irradiating ultraviolet rays and achieving a sterilizing effect has appeared, sterilization is performed only for a portion irradiated with ultraviolet rays, and the above problems can not be completely solved even in this case.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a dishwasher in which cleaning of food waste can be smoothly removed.

The present invention also provides a dishwasher capable of effectively sterilizing all the dishes and all the space inside the tub.

The above object of the present invention can be achieved by a washing machine comprising: a tub forming a space in which a tableware is washed; A sump receiving wash water supplied to the tub; And a heater for heating the washing water accommodated in the sump to supply the turbo steam.

Preferably, the heater is configured to heat the washing water so that the washing water is washed with the hot washing water when the washing water is pumped into the tub and circulated washing is performed.

At this time, the heater is configured to adjust the heating capacity, and the washing water can be heated to a higher heating capacity than when the washing water is circulated while the steam is supplied.

The controller may further include a controller for controlling the amount of wash water accommodated in the sump, wherein the controller controls the steam generator so that when the steam is supplied to the steam generator by the heater, It is preferable to be configured to control the water level to be maintained lower than when it is made.

The water supply device may further include a water supply device for supplying wash water to the sump and a drain device for discharging wash water accommodated in the sump, wherein the water supply device and the drainage device can be controlled by the control part.

The controller may further include a sensor unit for measuring the level of the washing water accommodated in the sump, and the controller senses the level of the washing water by the sensor unit.

In this case, the controller may maintain the level of the washing water accommodated in the sump higher than the installation position of the heater while the steam is supplied.

Meanwhile, the controller may control the heater to discharge the residual water of the sump and generate fresh water before generating the steam.

Preferably, the steam is supplied to the turbine using a flow path through which the washing water moves when the dishwasher is washed with the washing water. At this time, a part of the steam is supplied to the turbine along the flow path, Can be supplied.

It is another object of the present invention to provide a method of controlling a dishwasher having a heater for heating washing water contained in a sump, the method comprising the steps of: washing the dishwasher using high temperature washing water using the heater; And a control step of controlling to perform the supplying step.

Specifically, a washing circulation step of heating the washing water accommodated in the sump with the heater to circulate the washing water in the tub to wash the dishware; And a steam supplying step of supplying the turbo steam by heating the washing water accommodated in the sump with the heater.

At this time, it is preferable that the steam supply step adjusts the amount of wash water accommodated in the sump prior to generating the steam by heating the wash water.

Here, it is preferable that the steam supply step maintains the amount of the washing water accommodated in the sump less than the amount of the washing water circulated in the washing and circulating step.

Preferably, the steam supply step maintains the level of the washing water accommodated in the sump higher than the level at which the heater is installed.

On the other hand, it is also possible to control to discharge residual water present in the sump prior to performing the steam supply step.

According to the present invention, it is possible to easily remove the food waste attached to the utensil by supplying steam to the tub in which the utensil is housed, and sterilization treatment of the utensil and the tub is also possible.

Further, since it is not necessary to provide a separate heater, a water supply device, and a nozzle for supplying the steam, it is easy to manufacture and the cost can be greatly reduced.

Hereinafter, a first preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic view showing a schematic configuration of a dishwasher according to a first embodiment.

The dishwasher includes a cabinet (1) forming an outer appearance, a tub (10) forming a space for washing dishes and a washing water used for washing the dishes are installed in the cabinet (1) (Not shown).

Inside the tub 10, a rack 11 for storing dishes and at least one spraying arm 12 for spraying the pumped washing water to the dishes may be provided. At this time, the spray guns 12 may be formed with spray holes for spraying washing water. The spray gun 12 is preferably rotatably installed at a position corresponding to the rack 11 so as to uniformly spray wash water on the tableware.

The driving unit 20 may be provided with a water supply unit 55 for supplying washing water from an external monastery and a drainage unit 50 for discharging washing water stored in the sump 30 to the outside have.

The driving unit 20 is formed on the lower side of the tub 10 and is capable of receiving wash water sprayed from the spray gun 12 to fall down. In this case, a connection pipe 13 for pumping the washing water upward may be further provided, and the connection pipe 13 is connected to the spraying arm 12.

FIG. 2 is an exploded perspective view illustrating components of the driving unit in an exploded manner.

The driving unit 20 includes a sump 30 for receiving washing water, a water supply unit 55 for supplying washing water to the sump 30, a drainage unit 50 installed in the sump 30 for draining wash water, A cleaning pump disposed inside the sump 30 for pumping the washing water contained in the sump 30 and a part of the pumped washing water may be configured to include filtering means for guiding to the spray gun 12 and for filtering the remaining washing water have.

The sump 30 forms a space for receiving washing water and a drain chamber 32 communicating with the drainage unit 50 may be formed at one side of the sump 30. [ A flow control device 35 may be provided outside the sump 30 and a flow control valve 36 may be axially coupled to the flow control device 35.

The water supply device 55 is connected to an outside monastery to supply washing water, and is connected to one side of the sump 30. [ However, it is also possible to directly supply it to the inside of the tub 10, which is merely an embodiment. The water supply device 55 may include a water supply pipe 56 for supplying washing water and a water supply valve 57 for selectively opening and closing the water supply pipe 56.

The drainage device 50 may include a drain pump 53 installed in the drainage chamber 32. The drain pump 53 is composed of a drain motor 51 and an impeller 52.

The washing pump may include a washing motor 41 installed at a lower portion of the sump 30 to generate a driving force and an impeller 42 installed at the filtering means to pump wash water. At this time, a dispenser 43 is rotatably mounted on the shaft of the washing pump, and a disposer 43 capable of crushing food waste is axially coupled to the shafts of the washing pump. The disposer 43 is provided with a predetermined mesh It is preferable that the screen 44 be disposed.

The filtering means includes a pump housing 60 in which a space for installing the impeller 42 is formed, a filter housing 70 installed to cover the upper side of the pump housing 60, And a cover 80 installed to cover the upper side of the cover 80. At this time, the pump housing 60 is disposed on the lower surface of the filter housing 70, and the cover 80 is disposed on the upper surface of the filter housing 70.

The dust collection chamber 71 may be formed in the filter housing 70 and a drain pipe 72 communicating with the drain chamber 32 may be formed in the dust collection chamber 71. At this time, the drain pipe 72 may be formed to be protruded downward by a predetermined length as compared with the bottom surface of the filter housing 70 so as to be located in the drainage chamber 32 when assembled.

The cover 80 is preferably provided with a filter 81 so as to correspond to the dust collecting chamber 71 of the filter housing 60 and more preferably a plurality of collection holes 82 outside the filter 81, Can be formed. The recovery hole 82 communicates with the sump 20. [

At least one main channel connected to the dust collecting arm 12 and a sampling channel passing through the dust collecting chamber 71 may be provided in the filter housing 70, respectively. Further, it is preferable to further include a flow control valve 36 which is axially coupled to the flow control device 35, so that the flow path inside the filter housing 70 is determined.

On the other hand, it is preferable that a part of the washing water always flows into the sampling flow path irrespective of which main flow path is opened by the flow path control valve 36. This is because only the foreign matter filtering function against the washing water can be continuously performed.

The washing water flowing into the dirt collecting chamber 71 through the sampling flow path may overflow through the filter 81 located above the dirt collecting chamber 71. At this time, it is preferable that the filter 81 filters the foreign substances contained in the washing water.

The wash water filtered in the overflow process and the wash water sprayed through the spray gun 12 and dropped to the cover 80 are introduced into the sump 20 again through the recovery hole 82, .

3 is a cross-sectional view showing a cross section of the driving unit 20. Fig. Hereinafter, the heater 100 installed in the driving unit 20 will be described in detail with reference to FIG.

As shown in FIG. 3, in the present embodiment, it is preferable to further include a heater 100 for supplying steam to the tub 10.

This is because the food on the surface of the dishes can not be completely removed only by spraying the dishes with high pressure. In this case, it is difficult to remove the food which is firmly attached to the tableware in a dry state, and it may take a long time to sufficiently be called.

Therefore, according to the present invention, the heater 100 may be provided for heating the washing water to generate hot steam at the tub 10. The steam can be easily absorbed into the food attached to the tableware at a much higher temperature than the washing water, so that the food can be sufficiently called in a short time. Accordingly, when the steam is supplied to the tub 10 as in the present invention, the food attached to the dishes can be easily removed by the washing water, and the washing performance can be greatly improved upon dishwashing.

In addition, according to the present invention, the sterilizing action can be performed by the steam. This is because the steam has a high temperature of up to 100 DEG C and therefore has the same effect as boiling a dish. Conventional sterilization apparatus using ultraviolet rays is sterilized only at a portion where the cost is high and ultraviolet rays are irradiated, whereas when steam is used according to the present invention, steam is supplied to all surfaces of the tableware and the inside of the tub 10 It is possible to sterilize the whole surface, and the cost is low.

At this time, it is preferable that the steam is separately supplied before or after the main washing. This is because the food attached to the tableware can be called prior to the washing, or the tableware and the tub can be finally sterilized after the washing is completed. However, this is merely an embodiment, and in the case where this washing is performed several times, it is also possible to supply steam at the intermediate stage and to supply the steam while the present washing is proceeding.

In the present invention, it is preferable that the heater 100 is installed to heat the washing water stored in the sump 30 to supply steam. Of course, it is also possible to generate steam by supplying water separately from the water supply device 55 without using the washing water accommodated in the sump 30. However, in the case of generating steam using water supplied separately, a separate flow path and a valve connected to the water supply device 55 and a nozzle for supplying steam to the tub are additionally required. There is a possibility of becoming complicated.

Accordingly, the present embodiment includes a heater 100 at an inner lower portion of the sump 30, and the heater 100 heats the washing water stored in the sump 30 to generate steam. At this time, the steam may be supplied to the tub 10 by using a flow path through which washing water moves for washing dishes.

That is, the washing water sprayed to the tub 10 drops downward and is collected by the sump 30. Most of the dishwashers have a flow path communicating with the tub 10 on the upper side of the sump 30. [ Since the steam has a property of rising as a gas, steam can be supplied to the tub 10 along a flow path communicating with the tub. Accordingly, in the case of the present embodiment, the steam can be supplied to the tub 10 through the recovery hole 82 formed in the cover 80, and the like.

In the case where the heater 100 generates steam by heating the washing water stored in the sump 30, it is necessary to provide a separate nozzle for supplying steam because the steam is supplied using the conventional washing water flow path There is no. In addition, when the nozzle is provided, steam is condensed on the surface of the nozzle. In contrast, the present invention minimizes the condensation of steam during the supply of steam, thereby supplying a larger amount of steam.

At this time, some of the steam supplied by the heater 100 may be supplied through the path where the washing water of the sump 30 is supplied to the tub 10. The steam generated in the sump 30 flows into the filter housing 70 through the opening formed in the lower side of the pump housing 60 and flows into the tub 10 through the spray arm 12 along the main flow path. . In this case, there is an advantage that the washing water can sterilize the flow path pumped from the sump 30 to the tub 10.

Meanwhile, in the present embodiment, it is preferable that the heater 100 is configured to be able to heat the washing water so that the dishwashing can be performed using the high-temperature washing water when the washing water is circulated for washing dishes. This is because the higher the temperature of the washing water is, the easier it is to remove and remove the food attached to the dish, thereby improving the washing performance of the dishwasher during the washing cycle.

Accordingly, in the present embodiment, the heater 100 may supply the steam to the tub 10 by heating the washing water accommodated in the sump 30 according to the operation of the dishwasher, It is also possible to supply the washing water.

That is, the heater 100 may generate steam by heating the washing water to 100 ° C or higher, and may generate hot water by heating to 100 ° C or lower when the washing is progressed.

At this time, various methods are available for controlling the temperature of the washing water heated by the heater 100.

First, the heater 100 may be constituted by a variable heater whose heating capacity is regulated to control the temperature of the washing water. In this case, when the steam is supplied to the tub 10, it is preferable to heat the washing water by increasing the amount of the invention so that the heater can generate steam. In addition, when washing water is circulated for washing, it is preferable that the washing water is heated to a relatively low calorific value and supplied with hot water at a predetermined temperature.

It is also possible to control the temperature of the washing water by controlling the amount of the washing water heated by the heater 100. When the heating value of the heater is constant, the temperature of the washing water increases as the amount of the washing water decreases.

Therefore, when supplying steam, it is preferable to maintain a small amount of washing water in comparison with the case where the washing cycle is performed, and to heat the washing water to such a high temperature that steam can be generated from the washing water.

Accordingly, in the present embodiment, the control unit 110 further includes a heater 100 capable of adjusting the heating capacity according to the contents to be operated, and a controller 110 for controlling the amount of washing water accommodated in the sump 30 .

As described above, the heater 100 preferably heats the wash water with a higher heating capacity than when the washing water is circulated while the steam is being supplied.

The controller 110 may control the water level of the washing water to be maintained at a lower level than when the washing water is circulated while the steam is supplied. This is because, even if the heater 100 capable of controlling the amount of heat generation is used, the time for generating steam can be shortened according to the amount of the washing water.

4 is a block diagram showing the contents to be controlled by the control unit.

4, the water supply unit 55 and the drainage unit 50 according to the present embodiment are preferably controlled by the control unit 110, respectively. Accordingly, the control unit 110 controls the water supply unit 55 to supply the washing water or the drainage unit 50 to discharge the washing water to regulate the amount of the washing water accommodated in the sump 30.

In addition, the present embodiment may further include a sensor unit 120 for measuring the level of the washing water accommodated in the sump 30. At this time, the controller 110 may control the amount of washing water accommodated in the sump 30 while sensing the level measured by the sensor unit 120.

For example, if the sensor unit 120 measures that the level of the washing water is lowered to a level not pumping the driving unit 20 during the washing operation of the tableware using the washing water, It is possible to control the water supply device 55 to supply the washing water.

Alternatively, when it is determined that the amount of washing water is high enough to prevent steam from being generated compared to the heating capacity of the heater during the operation of supplying steam, the control unit 110 controls the drainage unit 50 to supply a predetermined amount of washing water It is possible to discharge it.

Here, when the steam is generated by the heater, the sensor unit 120 may include a high-water level sensor 121 so that the amount of the wash water does not exceed a preferable amount. The high-level sensor 121 may be formed at a height corresponding to a position of an opening formed in a lower portion of the pump housing.

Here, the control unit 110 may maintain the level of the washing water accommodated in the sump 30 higher than the position where the heater is installed during operation of the heater.

Generally, the heater 100 used in the dishwasher transfers heat generated by an internal heating element to washing water in contact with the outer surface of the heater, thereby heating the washing water. Therefore, when the level of the washing water is not maintained higher than the installation position of the heater, the surface of the heater 100 may be overheated and damaged, and the heating efficiency by the heater 100 may be significantly reduced .

The heater 100 is installed below the sump 30 and the control unit 110 controls the level of the washing water of the heater 100 to be lower than the level of the heater 100 ) Is always higher than the installed position. The control unit 110 may sense the level of the washing water by the sensor unit 120 or may include a low water level sensor 122 for sensing a minimum water level at a location where the heater 100 is installed, May be separately provided.

Meanwhile, the controller 110 may control the water supply to be performed by draining the residual water of the sump 30 before generating the steam by heating the heater 100.

When the washing water contains dirt in the process of washing the dishware, there is a fear that a bad odor is generated when the washing water is heated. In particular, when steam is supplied for sterilization of dishes in the final stage of dishwashing, the user may be discomforted due to the malodor.

Accordingly, in this embodiment, before the controller 110 selectively generates steam, the water supply device 55 and the drain device (not shown) may be provided to discharge the residual water in the sump 30 and supply steam using freshly supplied washing water. (50).

Hereinafter, a second embodiment of a preferred control method of the dish washer according to the present invention will be described with reference to Figs. 5 and 6. Fig.

The dishwasher is a device for washing dishes stored in the tub 10 using washing water. The dishwasher may include a heater 100 for heating the washing water in which the sump 30 is received. At this time, the dishwasher can be controlled to heat the washing water using the heater 100 so that the dishwashing can be performed using the high-temperature washing water, and the steam is supplied to the tub 10 by heating the washing water. . That is, one heater 100 may be used to control the supply of hot wash water during dishwashing, or may be controlled to supply steam to the tub 10 at a point in time when no dishwashing is performed.

As shown in FIG. 5, the control method of the dishwasher according to the present embodiment is a washing cycle in which the washing water accommodated in the sump 30 is heated by the heater, the washing water is circulated to the tub 10, And a steam supplying step S2 of supplying steam to the tub 10 by heating the washing water accommodated in the sump 30 in step S1.

Here, the washing circulation step S1 and the steam supplying step S2 may be included a plurality of times according to the operation details of the dishwasher, and the order of the washing circulation step S1 and the steam supplying step may also be changed It is possible.

FIG. 6 is a flow chart showing the controlled contents of the steam supply step S2 in FIG.

5, the steam supplying step S2 of the present embodiment includes adjusting the amount of the washing water accommodated in the sump 30 before the steam is generated by heating the washing water to the heater 100 . In this case, it is more preferable that the amount of the washing water is controlled to be less than the amount of the washing water circulated in the washing and circulating step.

In the washing and circulating step S1, washing water having a certain level or more is required to pump the washing water by the driving unit 20, and more than a predetermined amount of washing water is required to improve washing efficiency.

 The steam supply step S2 does not require the washing water to be pumped by the driving unit 20 and when the heater 100 having the same heating value is used, As shown in Fig.

Of course, if the heater 100 is constituted by a variable heater capable of controlling the amount of heat generated, the amount of heat generated by the heater 100 may be increased to generate steam in the steam supply step S2. However, even in this case, there is an advantage that the time taken to generate steam can be shortened by heating in a state where the amount of washing water is reduced.

Meanwhile, the steam supplying step (S2) heats the washing water using the heater (100) after adjusting the amount of the washing water. When the washing water reaches a boiling point of the water temperature, steam is generated and supplied to the tub 10. At this time, the steam may be supplied for a predetermined time so as to perform a blowing function to easily remove the dirt attached to the dishware or to sterilize the tub 10 and the dishware.

However, it is preferable that the water level of the washing water is controlled to be maintained at a level higher than a position at which the heater 100 is installed during the steam supplying step S2.

When the time for supplying the steam is long, the washing water stored in the sump 30 may evaporate and the water level may be lowered to the lower part of the heater 100. [ In this case, the surface of the heater 100 may be overheated and damaged, and the heating efficiency by the heater 100 may be significantly reduced. Therefore, it is preferable that the water level of the washing water accommodated in the sump 30 is sensed while the steam supplying step S2 is performed to maintain the water level higher than the level at which the heater 100 is installed.

Therefore, in the present embodiment, a position slightly higher than the position where the heater 100 is installed is set to the lowest water level of the washing water, and when the water level of the washing water accommodated in the sump 30 in the steam supplying step S2 is lower than the lowest When the water level is reached, a certain amount of wash water can be controlled to be supplied.

At this time, the amount of the washing water to be supplied is preferably set in consideration of the capacity of the heater 100 and the heating efficiency of the washing water. In this case, however, it is preferable to supply water so as to maintain the water level lower than the water level of the washing water accommodated in the sump 30 in the washing circulation step S1. This is to efficiently generate steam as described above.

Meanwhile, when the washing and circulating step S1 is performed after the steam supplying step, it is preferable that the washing water is further supplied before the washing circulation is performed by pumping the washing water. Since the amount of the washing water accommodated in the sump 30 is reduced in the steam supplying step S2, the washing water must be replenished so that the washing circulation can be performed.

When the steam supply step S2 is performed after the last washing cycle S1, as shown in FIG. 6, the step of discharging residual water present in the sump prior to the steam supply step is performed .

The washing water at the end of the washing circulation step (S1) may contain foreign matter washed in the washing cycle. When the washing water containing foreign substances is heated to supply steam, odor may be generated.

Therefore, if the steam supplying step S2 is performed for the purpose of sterilization or the like, the residual water is drained before the steam supplying step S2, the new washing water is supplied, and then the steam supplying step S2 is performed .

1 is a schematic view showing a schematic configuration of a dishwasher according to a first preferred embodiment of the present invention,

FIG. 2 is an exploded perspective view illustrating the components of the driving unit of FIG. 1,

FIG. 3 is a cross-sectional view of the driving unit of FIG. 1,

4 is a block diagram showing control contents of the control unit,

FIG. 5 is a schematic view showing a schematic flow of a dishwasher control method according to a second preferred embodiment of the present invention, and FIG.

FIG. 6 is a flow chart showing controlled contents in the steam supply step in FIG. 5; FIG.

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

10: tub 20:

30: Sump 50: Drain

55: water supply device 80: cover

100: heater 110:

120: sensor part S1: washing cycle step

S2: Steam supply step

Claims (17)

A tub forming a space in which the tableware is cleaned; A sump receiving wash water supplied to the tub; And a heater for supplying the turbine steam by heating the washing water accommodated in the sump, Wherein the steam is supplied to the tub through a flow path communicating the tub and the sump, and a part of the steam is supplied to the tub through a flow path through which the washing water is supplied to the tub. The method according to claim 1, Wherein the heater heats the washing water so that washing with the hot washing water is performed when the washing water is pumped to the tub and circulated washing is performed. 3. The method of claim 2, Wherein the heater is configured to adjust the heating capacity so that the washing water is heated to a higher heating capacity than when the washing water is circulated while the steam is supplied. The method according to claim 2 or 3, Further comprising a controller for controlling the amount of wash water received in the sump. 5. The method of claim 4, Wherein the control unit controls the water level of the washing water to be maintained at a lower level than when the washing water is circulated while the steam is supplied so that steam is easily generated by the heater. 6. The method of claim 5, Further comprising a water supply device for supplying wash water to the sump and a drain device for discharging wash water accommodated in the sump, wherein the water supply device and the drainage device are controlled by the control part. 5. The method of claim 4, And a sensor unit for measuring the level of the washing water accommodated in the sump, Wherein the controller senses the level of the wash water by the sensor unit. 8. The method of claim 7, Wherein the control unit maintains the level of the washing water accommodated in the sump to be higher than the installation position of the heater while the steam is supplied. 5. The method of claim 4, Wherein the control unit discharges the remaining water of the sump and controls the water supply to be newly performed before generating the steam by heating the heater. The method according to claim 1, The flow path through which the steam is supplied to the tub and the sump communicates with the sump is formed in a cover provided to cover the upper side of the sump and is a recovery hole formed to allow the washing water to flow back into the sump from the tub Dishwasher. The method according to claim 1, Wherein the passage through which the washing water for supplying a part of the steam to the tub is supplied to the tub is a washing water spraying rock formed along the main passage through which the washing water is supplied to the tub. delete A control method for a dishwasher having a variable heater capable of controlling a heating value for heating washing water contained in a sump, A washing circulation step of heating the washing water accommodated in the sump with the heater and circulating the washing water in the tub to wash the tableware; And And a steam supplying step of supplying the turbine steam by heating the washing water accommodated in the sump with the heater, The steam supply step may be performed before the washing circulation step, during the washing circulation step, or after the washing circulation step, discharging residual water present in the sump prior to performing the steam supplying step, Wherein the steam supplying step further comprises adjusting an amount of washing water accommodated in the sump in accordance with an amount of heat generated by the heater before steam is generated. delete 14. The method of claim 13, Wherein the steam supply step maintains the amount of wash water received in the sump less than the amount of wash water circulated in the wash cycle. 14. The method of claim 13, Wherein the steam supply step maintains the level of the washing water accommodated in the sump higher than the level at which the heater is installed. delete

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