KR101611297B1 - Method of controlling dish washer - Google Patents

Abstract

A method of controlling a dishwasher according to the present invention includes the steps of washing a dishwasher with wash water in which detergent is dissolved; Draining the wash water in which the detergent is dissolved; Rinsing the tableware with wash water in which the detergent is not dissolved; And rinsing the tableware with wash water in which the descaling agent is dissolved.

Description

[0001] METHOD OF CONTROLLING DISH WASHER [0002]

The present invention relates to a control method of a dishwasher, and more particularly, to a control method of a dishwasher in which a dispensing time point of a descaling agent is optimized.

If the washing water has a hardness of 60 ppm or more, it is inevitably scaled when the hard water is heated. Most dishwashers have a stroke to heat the washing water, so that various problems due to the scale may occur if proper treatment of the hard water is not performed.

In order to remove the scale generated by the dishwasher, it is necessary to supply an appropriate amount of descaling agent according to the hardness of the washing water. Since a considerable amount of the generated scale is discarded together with the drainage in the dishwasher, the amount of descaling agent actually required is very small. When the descaling agent is supplied excessively, there arises a problem in the product reliability, and since too little supply may degrade the descaling performance, it needs to be injected exactly as required. However, it is not easy for the user to accurately meter the required amount of descaling agent, and there is a very troublesome problem.

A problem to be solved by the present invention is to provide a control method of a dishwasher in which a supply timing of a descaling agent is optimized.

It is another object of the present invention to provide a dishwasher control method capable of minimizing the amount of descaling agent supplied while ensuring sufficient descaling performance.

In addition, in the state where the rinsing step is completed, the scale component contained in the washing water remaining in the tub or the like is minimized, so that even if the remaining washing water is completely removed by natural drying or drying, And to provide a control method of a dishwasher.

A method of controlling a dishwasher according to the present invention includes the steps of washing a dishwasher with wash water in which detergent is dissolved; Draining the wash water in which the detergent is dissolved; Rinsing the tableware with wash water in which the detergent is not dissolved; And rinsing the tableware with wash water in which the descaling agent is dissolved.

Alternatively, the method of the present invention for controlling a dishwasher of the present invention comprises the steps of: washing a tableware with a detergent; Performing rinsing to remove the detergent used for the dishwashing; The washing water used for the rinsing is drained, and then the descaling agent is supplied together with the washing water to rinse the tableware.

The control method of the dishwasher of the present invention has an effect of minimizing the consumption amount of the descaling agent by optimizing the dispensing time of the descaling agent so that the descaling operation can be smoothly performed.

The control method of the dish washer according to the present invention minimizes the scale component contained in the washing water remaining in the tub or the like in the state where the rinsing step is completed, so that even if the remaining washing water is completely removed by natural drying or drying , There is an effect that contamination due to the scale does not occur.

In addition, the control method of the dishwasher of the present invention has an effect of preventing the antagonistic action by the detergent in the process of operating the descaling agent, thereby improving the descaling performance.

1 is a perspective view of a dishwasher according to an embodiment of the present invention.
2 shows the dishwasher with the door opened.
Figure 3 shows the main arrangements inside the dishwasher.
4 schematically shows a descaling solvent supply device.
FIG. 5 is a graph showing the scale generation rate according to the pH of the raw water.
FIG. 6 is a graph showing the correlation between the pH and the scale generation rate when the temperature is different according to the detergent concentration and the rinsing concentration.
7 is a graph showing a scale generation rate according to the temperature of the raw water by the amount of citric acid supplied.
Fig. 8 shows the scale generation rate according to the concentration of citric acid when the rinse is put in. Fig.
Fig. 9 is a graph showing the scale generation rate according to the concentration of citric acid when the detergent is put in. Fig.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

1 is a perspective view of a dishwasher according to an embodiment of the present invention. 2 shows the dishwasher with the door opened. Figure 3 shows the main arrangements inside the dishwasher. 4 schematically shows a descaling solvent supply device. 1 to 4, a dishwasher according to an embodiment of the present invention includes a casing 3 forming an outer shape, a tub 6 disposed inside the casing 3 to form a washing space for washing dishes, A sump 20 for collecting washing water for dish washing, and a descaling solvent supplying device 100 for discharging a descaling agent to the washing water which is supplied to the sump 20. As shown in Fig. The descaling agent is released in a dissolved state by the washing water. Hereinafter, the descaling agent combines with metal ions (for example, Ca ²⁺ , Mg ²⁺ ) in the hard water to inhibit scale formation, And a solution in which the descaling agent is dissolved is defined as a descaling solvent.

The descaling agent (d: see Fig. 4) is based on an acid composition. For example, a descaling agent such as hydrochloric acid, citric acid, malic acid, tartaric acid, acetic acid, Organic acids such as lactic acid and formic acid, and chemical substances such as phosphoric acid and sulfamic acid. These chemical substances are not limited to solid or powdery solid forms, . In particular, organic acids such as citric acid are harmless to the human body and are environmentally friendly.

The casing (3) may include a cabinet (1) formed with a dishware inlet and a door (2) opening and closing the dishware inlet. The door 2 may be provided with a handle 2a, a control panel 5 for controlling the operation of the dishwasher, and a display 4 for indicating the operating state of the dishwasher.

The tub 6 is provided with racks 7a and 7b on which dishes are placed and nozzles for receiving washing water from the sump 20 and spraying the dishes with the dishes placed on the racks 7a and 7b. A plurality of racks 7a and 7b may be provided. In this embodiment, an upper rack 7a and a lower rack 7b are disposed below the upper rack 7a. The nozzles 8a, 8b and 8c may be provided with a plurality of nozzles 8a, 8b and 8c so that the washing water can be sprayed in various directions. An intermediate nozzle 8b disposed between the upper rack 7a and the lower rack 7b for spraying washing water downward toward the lower rack 7b and a lower nozzle 8b disposed between the upper rack 7a and the lower rack 7b, And a lower nozzle 8c arranged below the lower nozzle 8c for spraying the washing water upward. Although not shown, guide ducts for guiding the washing water from the sump 20 to the respective nozzles corresponding to the constitution of the nozzles And a flow-switching portion (not shown) for selectively interrupting the guide flow paths may be further provided. A washing pump 40 for feeding wash water contained in the sump 20 by the guide flow path and a heater 52 for heating washing water in the sump 20 may be further provided.

The dishwasher may include a water supply device (30) for supplying wash water to the sump (20). The water supply device (30) can be disposed between the tub (6) and the cabinet (1). The water supply device 30 is provided with a flow path for guiding the flow of the washing water introduced therein and water chambers for containing the washing water guided along the flow path and connected to a water supply lake into which raw water (for example, tap water) A flow meter 33 for sensing the amount of raw water coming into the water supply hose connection port 32a, a water chamber 31 for storing the introduced rinsing water, (Not shown) that communicates the flow path with the atmosphere to prevent the siphon phenomenon from flowing into the atmosphere.

According to the embodiment, the water supply device 30 may further include not only a flow path for supplying the washing water to the sump 20, but also a flow path for supplying washing water to the tub 6 directly, without passing through the sump 20. [ .

The water supply device 30 includes a sump drainage connection port 32c connected to a sump drainage channel (not shown) through which the washing water used for dishwashing is discharged from the sump 20 and a sump drainage connection port 32c for draining water to be introduced into the drainage pump And a drain pump inflow connection port 32d connected to the pump inflow conduit (not shown).

The washing pump 40 includes a washing water guide 41 for guiding the washing water in the sump 20 to the nozzles 8a, 8b and 8c side, an impeller 42 rotatably provided in the washing water guide 41, And a cleaning motor 43 for rotating the cleaning motor 42.

The water supply valve 113 interrupts the washing water supplied to the sump 20. When water is supplied from the water supply device 30 to the sump 20 according to the embodiment, And may be provided to intermittently supply water from the external water source when water is supplied directly to the sump 20 from the external water source. The operation of the water supply valve 113, the cleaning motor 43, and the like is controlled by a control unit (not shown).

The sump 20 and the tub 6 are communicated with each other so that the sump 2 is sprayed through the nozzles 8a, 8b and 8c so that the reduced amount of the washing water flows into the tub 6 again. The tub 6 is also in communication with the washing water outlet 112h of the descaling solvent supply device 100 to be described later through the sump 20. Accordingly, the washing water outlet 112h is opened in accordance with the level of the tub 6, The water pressure acting on the water surface also changes.

The sump 20 may further include a filter 51. In this case, the washing water injected into the tub 6 through the nozzles 8a, 8b and 8c passes through the filter 51 and is filtered , And then flows back to the sump 20.

Further, the dishwasher may include an additive introducing mechanism 9 for introducing detergent or rinse into the washing water, and the additive introducing mechanism may be configured to insert the detergent for washing or the rinsing rinse into the tub 6 ).

4 schematically shows a descaling solvent supply device. The descaling solvent supply device 100 is an embodiment of an apparatus for supplying a descaling agent into washing water. The descaling solvent dispensing apparatus 100 described below discharges the descaling solvent on the flow path of the washing water supplied to the sump 20, but is not necessarily limited thereto. According to the embodiment, the descaling agent may be a powder- , Or particulate form.

4, the descaling solvent supply device 100 includes a solvent accommodating portion 111 containing a descaling agent, and a water supply portion 111 which guides the washing water in the water supply process, bypasses the solvent accommodating portion 111, And a branched flow path 120 branched from the main flow path 112 and guiding the washing water guided along the main flow path 112 to the solvent containing portion 111 do.

The main oil passage 112 is divided into an upstream side oil passage 112a corresponding to the upstream side and a downstream side oil passage 112b corresponding to the downstream side on the basis of a portion communicated with the inlet of the branch passage 120 .

The descaling agent can be introduced into the solvent accommodating portion 111 in the form of powder or granules. It is preferable that the descaling agent is not dissolved in the washing water but only a part thereof is dissolved and the rest is deposited in a sufficient amount. That is, the washing water in the solvent accommodating portion 111 maintains the saturated or supersaturated state for a sufficient time until the descaling agent is exhausted and becomes unsaturated, and the solvent discharge valve 130 is opened each time for descaling agent supply Depending on the embodiment, the time may be set so that the descaling solvent may be injected approximately 4,000 to 5,000 times before the washing water in the solvent containing portion 111 reaches the unsaturated state.

The solvent accommodating portion 111 has a solvent outlet 111h through which the generated descale solvent is discharged. A solvent discharge valve 130 for opening and closing the solvent discharge port 111h may be further provided. Preferably, the solvent discharge port 111h is kept closed by the solvent discharge valve 130 during the water supply. The solvent discharge valve 130 may be a solenoid valve.

The branched flow path 120 includes an atmospheric communication port 123 positioned above the solvent discharge port 111h and communicating with the atmosphere. The atmospheric communication port 123 preferably communicates with the atmosphere even when water is supplied into the solvent accommodating portion 111. The atmospheric pressure acts through the atmospheric communication port 123. When the water supply is stopped while the washing water is filled in the solvent accommodating portion 111, the branch flow path 120 is connected to the downstream side 122 The head of the water is kept constant. Particularly, since the supply of the water to the sump 20 is performed while the solvent discharge port 111h is closed and a substantially constant atmospheric pressure acts on the air communication port 123, The descaling solvent can be quantitatively discharged from the receiving portion 111 when the solvent discharge valve 130 is opened. In particular, since the constant head-to-head difference is always maintained, the amount of descascase solvent to be introduced is kept constant even if the water pressure varies depending on the local characteristics of the dishwasher.

On the other hand, when the solvent discharge port 111h is closed by the solvent discharge valve 130 and the washing water flows through the branch flow path 120 to fill the solvent receiving portion 111, the washing water is no longer supplied to the solvent containing portion 111, and flows into the water supply device 30 through the air communication port 123. Thereafter, when the water supply is stopped, the quantity exceeding the maximum water level H in the downstream branch passage 122 and the quantity remaining in the upstream branch passage 121 out of the total washing water in the branch passage 123, And descends by its own weight and flows into the sump 20 along the oil passage 112.

The water level H in the downstream side, that is, the branch passage 122, is determined by the atmospheric pressure acting through the air communication port 123 when the water supply is stopped while the solvent containing portion 111 is filled with the washing water, Is maintained at a constant water head difference DELTA H with respect to the solvent discharge port 111h, and is hereinafter defined as a water head difference maintenance water level H. The water level in the tub 6 is maintained at the water level difference maintenance level H or lower so that the descale solvent can be discharged from the solvent containing portion 111 by the water head difference DELTA H at the time of opening the solvent discharge valve 130 desirable. And a water level sensor (not shown) for sensing the water level in the tub 6 may be further provided.

When the water level in the tub 6 sensed by the water level sensor reaches a predetermined water level or the water level sensed through the flow meter 33 reaches a preset water level, (113) is interrupted. Thereafter, the control unit opens the solvent discharge valve 130 at a predetermined time to discharge the descaling solvent from the solvent containing portion 111 to the main oil passage 112b, and then opens the water supply valve 113 again So that the washing water flows along the main oil passage 112b and is supplied to the sump 20 together with the descaling solvent. In order for the descaling solvent to be supplied quantitatively, it is preferable that the opening of the solvent discharge valve 130 is controlled on the basis of time. In other words, by controlling the opening time of the solvent discharge valve 130 to be constant, the amount of the descaling solvent supplied through the descaling solvent supply device 100 can be constantly controlled.

In the meantime, in the embodiment, the branch flow path 120 has the atmospheric communication port 123 at the uppermost end of the flow path, and the upstream branch flow path 121 guides the washing water upward in the direction of the air communication port 123 And the downstream branch flow path 122 is configured to guide the washing water in the downward direction, but the present invention is not limited thereto. The position of the atmosphere communication port 123 can be changed as much as possible within a range in which the water level in the downstream branch flow path 122 maintains a constant head difference with respect to the solvent discharge port 111h.

Generally, the dishwasher is provided with washing and rinsing steps. The cleaning stroke is intended to remove contamination on the dishes, and detergent for dishwashing may be injected during the administration process. Hereinafter, the washing water in which the detergent is dissolved is referred to as detergent water. The cleaning stroke may be constituted by a single stroke in which water supply and drainage are performed once, but it is also possible to perform water supply and drainage several times according to the embodiment. For example, the rinsing may include one or more pre-rinses and a pre-rinsing followed by a pre-rinsing. The preliminary washing is a step of roughly removing the contamination from the tableware before the main washing. In the preliminary washing, washing water (hereinafter referred to as raw water) in which the detergent is not dissolved is sprayed onto the tableware. Preliminary cleaning may be carried out several times for a sufficient degree of contamination removal and dewatering, and after each preliminary cleaning, draining is carried out and next preliminary cleaning or main cleaning may be carried out. After the wash water sprayed in each preliminary wash step is drained, the next preliminary wash or main wash step may be carried out. During this washing, detergent water is sprayed through the nozzles 8a, 8b and 8c, and the detergent water is preferably sprayed in a heated state by the heater 52.

The rinsing step is performed after rinsing the tableware, mainly after the rinsing step has been carried out. However, according to the embodiment, a menu is provided for the user to select only the rinsing step separately. The detergent is not put in the rinsing cycle, the rinsing water supplied from the external water source is used as is, or the rinsing water mixed with the rinsing rinse (hereinafter referred to as rinsing water) may be used. For example, the rinsing cycle may include at least one normal rinse and a heated rinse followed by a regular rinse. During normal rinsing, unheated raw water or rinse water is sprayed on the tableware, and raw water or rinse water heated by the heater 52 is sprayed onto the tableware during the heating and rinsing.

A control method of a dishwasher according to an embodiment of the present invention includes the steps of washing dishes with washing water (detergent water) in which the detergent is dissolved, draining the washing water in which the detergent is dissolved, (Raw water or rinse water), and rinsing the tableware with the wash water in which the descaling agent is dissolved.

FIG. 5 is a graph showing the scale generation rate according to the pH of the raw water. FIG. 6 is a graph showing the correlation between the pH and the scale generation rate when the temperature is different according to the detergent concentration and the rinsing concentration. 7 is a graph showing a scale generation rate according to the temperature of the raw water by the amount of citric acid supplied. Fig. 8 shows the scale generation rate according to the concentration of citric acid when the rinse is put in. Fig. Fig. 9 is a graph showing the scale generation rate according to the concentration of citric acid when the detergent is put in. Fig.

Referring to FIG. 5, the scale is increased as the pH of the wash water is increased. Hereinafter, the scale generation rate will be referred to as a scale amount (hereinafter referred to as a reference amount) when a constant amount of hard water (hereinafter, referred to as a hardness of 300 ppm) is left at a predetermined temperature and pH for a set time Quot;) is a ratio of the amount of scales generated in each experiment. For example, FIG. 5 is a graph showing the change in scale generation rate according to the pH condition of the washing water when washing water is sprayed on the dishware for the set time with the same amount of wash water (300 ppm hardness) as in the comparative example. In FIG. 5, the pH of the washing water was controlled by the amount of hydrochloric acid (HCl) and sodium hydroxide (NaOH). As can be seen from FIG. 5, when the washing water is acidic, scale formation is inhibited. However, in the case of basicity of pH 8 to 9 or more, a larger amount of scale is generated as the pH value is increased.

In particular, the detergent acts as a factor for increasing the pH value of the washing water, and a large amount of scale is generated during the washing of the tableware using the detergent water. On the contrary, the rinse acts as a factor for decreasing the pH of the washing water, and scaling is inhibited during a general rinse using the rinse water to rinse the tableware.

The effect of detergent and rinse on scale formation can be seen from FIG. 6, the pH of the rinse water is about 7.4, and the pH is about 6.2 when the rinse is concentrated (rinse (x5)). As can be seen from the figure, although the scale generation rate tends to be higher as the temperature of the washing water is higher under any condition, it can be seen that the scale generation rate is lower in the case of the rinsing water than in the detergent water or the raw water at the same temperature. That is, it is presumed that the rinsing has the function of suppressing the scale generation or removing the generated scale, and it is preferable that the descaling agent is not added before the general rinsing step in which the rinsing is performed, but the rinsing is performed by rinsing It is advisable to put it in after the descaling function has been performed. In this case, since the descaling effect by the rinsing has already been carried out, sufficient descaling performance can be ensured even if a small amount of descaling agent is added.

Rinsing also has the effect of lowering the rate of scale formation by itself or by interaction with a descaler agent. Referring to FIG. 8, it can be seen that the scale generation rate is lower than in the case where the rinse is introduced into the washing water, and the scale generation rate becomes lower as the concentration of citric acid supplied as a descaling agent becomes higher. Accordingly, the descaling agent may be supplied at the stage where the rinsing is applied during the rinsing cycle, for example, it may be supplied together with the rinsing at the time of general rinsing, or may be supplied together with the unheated raw water and rinsing after the heating rinsing. However, in the latter case, if the rinse cycle is completed after the heating rinse, the remaining components of the rinse may remain on the tableware, so that the rinse cycle is completed by spraying the washing water dissolved in the de- In this case, citric acid which is harmless to the human body is suitable for the descaling agent even if the remaining ingredients remain in the tableware after the rinse is completed.

Further, FIG. 7 shows the case where the raw water having a hardness of 300 ppm, the low concentration of citric acid into the raw water, and the high concentration of the citric acid into the raw water are not added but the detergent or rinse is not added. Scale formation rate. The graph shows that the higher the concentration of citric acid, the lower the scale generation rate. Second, the higher the temperature of the wash water, the higher the scale generation rate.

Especially, in order to aggressively remove scales generated in a high temperature environment, it is preferable that the descaling agent is supplied together with unheated raw water after the heating and rinsing is completed. For example, after the heated rinse, a step of spraying the descaler with the wash water may be additionally performed. After the washing water used in the heating and rinsing is drained, the raw water is supplied again to the sump 20. In this process, the descaling solvent can be supplied through the descaling solvent supply device 100.

Referring again to FIG. 6, it can be seen that the detergent added to the washing water not only increases the pH value but also increases the scale generation rate. In particular, referring to Fig. 9, it can be seen that even when the concentration of citric acid supplied to the detergent solution increases in the state where detergent is added, the scale generation rate is not significantly lowered unless the concentration of citric acid exceeds a considerable degree (approximately 1000 ppm) have. Therefore, the descaling agent is supplied to the detergent solution. If the amount of the descaling agent supplied is too small, the descaling effect is not smoothly performed. If the amount of the descaling agent is large, the consumption of the descaling agent increases accordingly, to be. Therefore, it is preferable that the descaling agent is not added during the step of spraying the detergent solution onto the tableware (for example, main washing). In the following example of the courses that can be provided through the dishwasher (see Table 1), consider the appropriate time for the descaling agent to be introduced.

course wash rinsing dry Reserve 1 Spare 2 Reserve 3 This washing General 1 General 2 Heated rinse Rapid / Dry o o o o (50 ° C) o o o (72 [deg.] C.) o rapidity o o o (50 ° C) o (50 ° C) strong o o o (60 [deg.] C.) o O o (70 [deg.] C.) o delicacy o o o (50 ° C) o o Scale removal o

First, the rapid / drying course comprises a first preliminary wash (preliminary 1), a second preliminary wash (preliminary 2), a third preliminary wash (preliminary 3), a wash stroke consisting of main wash, a first general rinse (general 1) A second general rinse (general 2), and a heating rinse, and a drying cycle. Hereinafter, the rapid / dry course will be described.

The preliminary cleaning step is called contamination of the tableware in advance so that the cleaning ability in the subsequent cleaning step can be improved. After the preliminary cleaning, the heater 52 is operated to heat the washing water, and the main washing in which the heated detergent water is sprayed onto the tableware is performed. The temperature of the detergent water during this wash reaches approximately 50 ° C. It is preferable that the heater 52 is not operated in the preliminary cleaning stage when the main cleaning is performed using the cleaning water heated by the heater 52. However, according to the embodiment, the heater 52 Of course.

The rinsing cycle of the rapid / dry course includes a first general rinse (general 1), a second general rinse (general 2), and a heated rinse. During the first general rinse and / or the second general rinse, the rinsing water may be injected into the dishware, and the raw water heated by the heater 52 during the heated rinse is injected into the dishware. Since the temperature in the tub 6 is raised by the heated rinsing, the drying efficiency in the subsequent drying step is increased. During the heated rinse, the temperature of the raw water reaches approximately 72 ° C. The dishwasher may include an exhaust duct (not shown) for guiding the discharge of air into the tub 6 and an exhaust fan (not shown) for feeding air through the exhaust duct. During the drying stroke, The humid air in the tub 6 is continuously discharged to the outside through the exhaust duct to lower the humidity inside the tub 6 and the dishes are dried.

In the rapid / dry course thus constituted, the supply of the descaling agent can be carried out during the heating rinsing or after the heating rinsing. During the heating and rinsing, the detergent charged during the main washing remains in the tub 6, so that descaling effects may be inhibited by the detergent even when the descaling agent is added. Therefore, in the rapid / dry course, the washing water used in the heating and rinsing is drained, the descaling agent is supplied to the sump 20 together with the raw water, and the washing water is supplied into the tub 6 through the nozzles 8a, 8b, And is preferably controlled to be sprayed. After the descaling agent is supplied, drainage is carried out, and a drying step can be carried out.

The rapid course may include a first preliminary wash, a second preliminary wash, a wash stroke consisting of main wash, a rinse stroke consisting of a single heat rinse stroke, and a drying stroke. In the present washing, the dishwashing is performed by the washing water heated by the heater 52. After the main cleaning, drainage is performed, and a heated rinse is performed to remove the detergent component remaining in the tableware. The supply of the descaling agent in the rapid course may be carried out during the heated rinsing or after the heated rinsing, as in the case of the rapid / dry course, but preferably after the heated rinsing. It is preferable that after the washing water used in the heating and rinsing is drained, the descaling agent is supplied to the sump 20 together with the raw water and the washing water is sprayed into the tub 6 through the nozzles 8a, 8b and 8c . After the descaling agent is supplied, drainage is carried out and a drying stroke can be carried out.

The intensive course may include a washing step consisting of a first preliminary washing, a second preliminary washing, a main washing, a rinsing step consisting of a first general rinse, a second general rinse, a heated rinse, and a drying step. During the main washing, the dishwashing is performed by the detergent water heated by the heater 52. During this wash, the temperature of the detergent water reaches approximately 60 ° C, and the temperature of the raw water during the heating rinse reaches approximately 70 ° C. The supply of the descaling agent in the strong course can be carried out during the heating rinsing or after the heating rinsing, as in the above-mentioned courses, but preferably after the heating rinsing. After the descaling agent is supplied, drainage is carried out and a drying stroke can be carried out.

The delicate course may include a washing step consisting of a first preliminary washing, a second preliminary washing, a main washing, a rinsing step consisting of a first general rinse, a heated rinse, and a drying step. During the main washing, the dishwashing is performed by the detergent water heated by the heater 52. During this wash, the temperature of the detergent water reaches approximately 50 ° C, and the temperature of the raw water during the heating rinse reaches approximately 68 ° C. In the delicate course, the supply of the descaling agent can be carried out during the heating rinsing or after the heating rinsing, similarly to the above-mentioned courses, but preferably after the heating rinsing. After the descaling agent is supplied, drainage is carried out and a drying stroke can be carried out.

In the above course, the descaling agent was supplied to the raw water supplied to the sump 20 after performing at least one rinse after the main washing in which the detergent was put in order to avoid the antagonistic action with the detergent. Rinsing may be applied during normal rinsing performed after the present cleaning, and the descaling agent may be supplied during normal rinsing. In this case, after rinsing is performed, drainage is performed, and subsequently, raw water is used again The rinsing must be performed. In particular, when the subsequent rinsing step is completed with the heating rinsing, the scale may be again generated in a high temperature environment. Therefore, preferably, the descaling agent is supplied together with the raw water at the last stage of the rinsing cycle, and when the last stage of the rinsing cycle is the heated rinse cycle, the high-temperature rinsing water is drained and then the descaling agent is supplied . Since the descaling agent supplied in the last stage of the rinsing cycle remains in a small amount in the washing water adsorbed to the constitution of the tub 6 or the heater 52 after the drainage is performed, .

Claims (15)

Washing the dishware with wash water in which the detergent is dissolved;
Draining the wash water in which the detergent is dissolved;
Rinsing the tableware with wash water in which the detergent is not dissolved;
Rinsing the tableware with wash water in which the descaling agent is dissolved; And
And a step of rinsing the dishwasher with the cleansing water dissolved in the descaling agent, and then discharging the air in the tub accommodated in the dishwasher by operating an exhaust fan. The method according to claim 1,
The step of washing the tableware with the washing water in which the detergent is dissolved,
And heating the washing water. The method according to claim 1,
The step of rinsing the tableware with the washing water dissolved in the descaling agent,
Wherein the detergent is drained after the undissolved washing water is drained. The method according to claim 1,
The step of rinsing the tableware with wash water in which the detergent is not dissolved,
And rinsing the tableware with wash water in which the rinse is dissolved. The method according to claim 1,
Wherein the descaling agent comprises an organic acid. 6. The method of claim 5,
Wherein the organic acid is citric acid. The method according to claim 1,
Wherein the descaling agent is charged in a predetermined amount each time. The method according to claim 1,
In the dishwasher,
A tub for receiving the dishware; and a sump for containing wash water supplied into the tub,
Wherein the descaling agent is supplied while supplying washing water from the outside of the tub to the sump. delete The method according to claim 1,
The step of rinsing the tableware with the washing water in which the detergent is not dissolved,
And heating the washing water. The method according to claim 1,
A preliminary washing step of washing the tableware with washing water in which the detergent is not dissolved; And
Further comprising the step of draining the wash water used in the preliminary washing step,
The step of washing the tableware with the washing water in which the detergent is dissolved,
Wherein the washing is performed after the washing water used in the preliminary washing step is drained. The method according to claim 1,
The step of rinsing the tableware with the washing water dissolved in the descaling agent,
A method of controlling a dishwasher as a last step of a rinse cycle. The detergent is added to wash the dishes;
Performing rinsing to remove the detergent used for the dishwashing;
After draining the washing water used for the rinsing, rinsing the tableware by supplying the descaling agent together with the washing water;
And the exhaust fan is operated to discharge the air in the tub accommodated in the tableware to the outside. 14. The method of claim 13,
The rinsing to remove the detergent used for the dishwashing is performed,
And spraying high-temperature washing water heated by the heater to the tableware. 14. The method of claim 13,
The rinsing to remove the detergent used for the dishwashing is performed,
A method of controlling a dishwasher, the method comprising: spraying a rinse-dissolved wash water onto the tableware.

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