KR20190075616A - Dishwasher and Controlling method therefor - Google Patents

Abstract

The present invention relates to a dishwasher for washing dishes and cooking utensils by spraying washing water, and a control method thereof. The control method of a dishwasher according to an embodiment of the present invention comprises: a water supply step of opening a water supply valve to supply washing water to the sump; and a variable spray step of spraying the washing water by at least one of a plurality of spray arms by changing the number of revolutions of the washing pump stepwise, so that the washing water can be sprayed evenly.

Description

[0001] Dishwasher and Controlling Method Therefor [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dishwasher and a control method thereof, and more particularly, to a dishwasher and a control method thereof for spraying washing water to wash dishes or cooking utensils.

The dishwasher is a household appliance for cleaning dirt such as food waste residing on dishes or cooking utensils (hereinafter, referred to as 'objects to be cleaned') by high-pressure washing water sprayed from the sandstone.

The dishwasher generally comprises a tub forming a washing chamber and a sump mounted on the bottom of the tub to store the washing water. Then, the washing water is moved to the spraying rock by the pumping action of the washing pump installed in the sump, and the washing water moved to the spraying rock is sprayed at high pressure through the jetting opening formed in the spraying rock. Then, the washing water sprayed at a high pressure impinges on the surface of the object to be cleaned, so that the dirt on the object to be cleaned drops to the bottom of the tub.

On the other hand, in the dishwasher, rinsing is performed in which the washing water is sprayed to the object to be cleaned to remove residual dirt. During the final rinse of spraying the heated wash water during this rinse, any remaining debris must be removed as much as possible. Accordingly, it is required that the washing water is sprayed evenly onto the object to be cleaned.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to provide a dishwasher and its control method in which the spraying range of washing water varies during rinsing.

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, a method of controlling a dishwasher according to an embodiment of the present invention includes: a water supply step of opening a water supply valve to supply washing water to a sump; Wherein at least one of the sandstones includes a variable jetting step for jetting the washing water, whereby the washing water can be evenly sprayed to the object to be cleaned.

In the variable injection stage, the washing pump can repeat the stepwise decrease in the number of revolutions after the stepwise increase.

In the variable injection stage, the number of the steps of increasing the number of revolutions of the cleaning pump may be equal to the number of steps of decreasing the number of revolutions.

In the variable injection step, the cycle of changing the number of rotations of the cleaning pump may be constant.

In the variable injection step, the cleaning pump may be at least the maximum time for one rotation of the minute sandstone in which the cycle of changing the number of rotations is rotated.

In the variable injection step, the washing pump may be at least one time at which the minute sandstone in which the cycle of changing the number of rotations is rotated, makes one revolution at the minimum number of rotations of the washing pump.

In the variable injection step, the washing pump may have a constant increasing / decreasing width of the number of rotations.

In the variable injection stage, the wash pump can pump the wash water to the upper spray sand.

In the variable injection phase, the upper jet of sandstone can change its rotational speed stepwise.

In the variable injection stage, the spray direction of the wash water in the upper spray can be changed into a stepped shape.

In the variable injection step, the number of revolutions of the washing pump may be equal to or less than the maximum number of revolutions of the washing pump in the top injection step and the maximum number of revolutions of the washing pump in the low injection step.

The control method of the dishwasher further includes an upper spraying step for keeping the rotation number of the cleaning pump constant after the variable injection step and a drainage step for stopping the operation of the washing pump after the upper spraying step and draining the wash water stored in the sump to the outside .

In the upper injection stage, the cleaning pump can maintain an average value of the number of revolutions that the number of revolutions changes in the variable injection stage.

The control method of the dishwasher further includes a heating step of heating the washing water supplied to the sump, and the variable injection step may inject at least one of the plurality of spraying arms with the heated washing water.

The water supply step, the heating step and the variable injection step are heating and rinsing steps. The control method of the dishwasher is such that the washing water supplied from the external water source is mixed with the rinsing detergent before the heating and rinsing step is performed, And a rinsing cycle for draining the washing water.

In order to achieve the above object, a dishwasher according to an embodiment of the present invention includes a tub, a plurality of spray guns arranged vertically to spray washing water in the tub, a sump in which washing water is stored, And a control unit for controlling the washing pump and the heater, wherein the control unit controls the heater to operate at least one of the plurality of spraying arms Wash water can be sprayed.

The control unit can repeat the stepwise deceleration after increasing the number of revolutions of the cleaning pump in a stepwise manner.

The control unit can change the number of revolutions of the cleaning pump at a constant cycle.

The control unit can change the number of revolutions of the cleaning pump to a constant increase / decrease width.

The control unit may control the switching valve to connect the cleaning pump to the upper spray gun when changing the rotational speed of the cleaning motor to a stepped shape.

The control unit can operate the drain pump after changing the number of revolutions of the cleaning motor to a stepwise shape and keeping it constant and stopping the operation of the cleaning motor.

The dishwasher further includes a heater for heating wash water sprayed by the plurality of spray guns, and at least one of the plurality of spray guns can spray the wash water heated by the heater.

The details of other embodiments are included in the detailed description and drawings.

According to the dishwasher and its control method of the present invention, one or more of the following effects can be obtained.

First, the number of revolutions of the washing pump that pressurizes the washing water to the minute sandstone spraying the washing water is varied stepwise, so that the range of the washing water is varied stepwise so that the washing water can be uniformly sprayed to the washing object.

Second, the number of revolutions of the cleaning pump can be changed to the same increase / decrease width as that of the same period, so that the filterable water level and the wash water circulating water level can be secured.

Third, the number of revolutions of the washing pump is changed, but the number of revolutions is maintained during at least one rotation of the washing arm, so that the washing arm can be rotated at least one revolution in a certain direction of the washing water.

Fourth, there is an advantage that the rinsing performance is improved by repeatedly increasing and decreasing the number of rotations of the washing pump in a stepwise manner between the jetting pressure at which the washing water is sprayed to the washing arm and the jetting pressure at which the lowest water level can be secured.

Fifth, the number of revolutions of the washing pump is changed stepwise, and the number of revolutions is kept constant, thereby collecting pre-discharge dirt in the filter and collecting the washing water stably in the sump.

Sixth, there is also an advantage that the washing water is sprayed evenly on the washing object in the final stage of spraying the heated washing water, thereby completely removing the residual dirt from the washing object.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

1 is a sectional view of a dishwasher according to an embodiment of the present invention.
2 is a block diagram of a dishwasher according to an embodiment of the present invention.
3 is a view showing each stroke in a general washing course of a dishwasher according to an embodiment of the present invention.
FIG. 4 is a view illustrating a method of controlling the heating of a dishwasher according to an embodiment of the present invention.
FIG. 5 is a view showing the rotation speed control of the washing pump in the control method of the dishwasher according to the embodiment of the present invention. FIG.
6 is a perspective view of the upper spray arm of the dish washer according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to 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.

Hereinafter, the present invention will be described with reference to the drawings for explaining a dishwasher and a control method thereof according to embodiments of the present invention.

1 is a sectional view of a dishwasher according to an embodiment of the present invention.

The dishwasher 1 according to the embodiment of the present invention includes a case 11 forming an outer appearance, a tub 12 accommodating the object to be cleaned, A plurality of spray guns 13, 14, 15 for spraying washing water into the tub 12, a plurality of spray guns 13, 14, 15 for spraying washing water into the tub 12, A filter 200 for filtering wash water injected from at least one of the minute sandstones 13, 14 and 15 and recovered into the sump 100, a washing pump 150 for feeding the washing water stored in the sump 100, And a switching valve (130) for flowing the washing water pumped by the pump (150) to at least one of the plurality of spraying arms (13, 14, 15).

The tub 11 is formed in a hexahedron shape with its front surface opened to form a washing chamber 12a therein. A communication hole 12c through which the washing water flows into the sump 100 is formed in the bottom 12b of the tub 11. [ The washing chamber 12a is provided with a plurality of racks 16, 17 for receiving the object to be cleaned. The plurality of racks 16 and 17 includes a lower rack 16 disposed at a lower portion of the cleaning chamber 12a and an upper rack 17 disposed at an upper portion thereof. And can be slidably pulled out of the tub 11 and pulled out from the upper and lower racks 16 and 17, respectively.

The plurality of minute dispersing sand rocks (13, 14, 15) are arranged in the vertical direction. The plurality of spraying arms 13, 14 and 15 includes a lower spraying sand 13 disposed at the lower end of the washing chamber 12a to spray washing water from the lower side to the upper side toward the lower rack 16, An upper spray arm 14 disposed at a heightwise direction of the washing chamber 12a on the upper side of the upper spray arm 13 and spraying washing water from the lower side to the upper side toward the upper rack 17, And a top fossil sand (15) disposed at an upper end of the washing chamber (12a) and spraying washing water from the upper side to the lower side toward the upper rack (17). The lower jet of sandstone 13 is disposed below the lower rack 16 and the upper jet sandstone 14 is disposed between the upper rack 17 and the lower rack 16, (17). According to the embodiment, the upper spray arm 14 can be sprayed downward toward the lower rack 16, and can be sprayed upward and downward toward both the upper rack 17 and the lower rack 16.

Each of the low-pressure sandstone (13) and the upper pressure-side sandstone (14) rotates about the center of the bar in the form of a bar. Each of the lower jet of sandstone 13 and upper jet of sandstone 14 rotates by the supply of wash water. Each of the low-pressure sandstone 13 and the upper spraystone 14 is formed with a nozzle (not shown) on the upper surface of the bar.

The plurality of minute sandstones (13, 14, 15) are supplied with the washing water from the washing pump (150) through the plurality of spraying arm connecting flow paths (18, 19, 21). The plurality of minute sandstone connecting flow paths 18, 19 and 21 are connected to the low-pressure sandstone connecting passage 18 connected to the low-pressure sandstone 13, the upper-low-pressure sandstone connecting passage 19 connected to the upper spraystone 14, And a top portion sandstone connecting passage 21 connected to the top portion sandstone 15.

The lower jet of sandstone 13, upper jet of sandstone 14 and top of vertical sandstone 15 are connected to the lower portion of the washing water tank 18 through the lower jet of sandstone connecting channel 18, upper jet sandstone connecting channel 19, (150).

The sump 100 is disposed below the bottom 12b of the tub 12 to collect wash water. The sump 100 is connected to a water supply channel 23 through which wash water supplied from an external water source flows. The water supply channel (23) is provided with a water supply valve (22) for interrupting washing water supplied from an external water source. When the water supply valve 22 is opened, the washing water supplied from the external water source flows into the sump 100 through the water supply flow passage 23.

The sump 100 is connected to a drainage passage 24 for guiding the stored wash water to the outside of the dishwasher 1. [ The drainage passage 24 is provided with a drain pump 25 for draining the wash water in the sump 100 through the drainage passage 24. The drain pump 25 includes a drain motor (not shown) for generating rotational force. When the drain pump 25 operates, the wash water stored in the sump 100 flows out of the case 11 through the drainage flow path 24.

The filter 200 is installed in the communication hole 12c to filter the dirt in the washing water moving from the tub 12 to the sump 100. [ The filter 200 is inserted into the saddle 100 with the mesh formed therein, and the opened upper portion protrudes upward from the tub 12. The washing water sprayed through the plurality of spray guns (13, 14, 15) falls to the bottom 12b of the tub 12 together with the dirt on the washing object. The washing water flowing on the bottom 12b of the tub 12 flows into the upper portion of the filter 200, passes through the lower mesh, is collected in the sump 100 after being filtered. The level of the washing water stored in the sump 100 needs to be maintained above the lower end of the filter 200 in order for the filter 200 to smoothly filter the dirt.

The switching valve 130 selectively supplies the washing water pushed by the washing pump 150 to at least one of the lower furnace sandstone 13, the upper furnace sandstone 14 and the tower furnace sandstone 15. The switching valve 130 selectively connects at least one of the washing water supply passage 180 and the plurality of spray passage connecting passages 18, 19 and 21.

The cleaning pump 150 supplies the wash water stored in the sump 100 to at least one of the plurality of spraying arms 13, 14, The cleaning pump 150 includes a cleaning motor 157 that generates a rotational force and an impeller 155 that is rotated by the cleaning motor 157 to pressurize the wash water. The cleaning motor 157 is a motor whose RPM can be varied, and the change of the number of revolutions of the cleaning pump 150 (the number of revolutions per time) means the change of the RPM of the cleaning motor 157. [ The cleaning pump 150 can maintain the rotation speed or change the rotation speed during operation. The number of revolutions of the washing pump 150 is proportional to the amount of washing water fed by the washing pump 150. When the number of revolutions of the cleaning pump 150 is changed, the direction of injection of the cleaning water sprayed from at least one of the plurality of spraying arms 13, 14, 15 connected to the cleaning pump 150 is changed. When the number of revolutions of the cleaning pump 150 is changed when the cleaning pump 150 is connected to at least one of the lower distributor sandstone 13 and the upper distributor rock 14, the lower distributor sandstone 13 and / ) Is changed.

The cleaning pump 150 is connected to the sump 100 and the storage oil passage 170. The washing pump 150 is connected to the switching valve 130 and the washing water supply passage 180. The washing water stored in the sump 100 flows into the washing pump 150 through the oil storage passage 170 and then is sent to the switching valve 130 through the washing water supply passage 180. [ The water level of the washing water stored in the sump 100 for allowing the washing water to flow into the washing pump 150 during the operation of the washing pump 150 is supplied to the side of the washing pump 150 170) connection portion.

The heater 140 is coupled to the lower side of the cleaning pump 150 to heat the cleaning water in the cleaning pump 150. The heater 140 heats the washing water flowing in the washing pump 150 when the washing pump 150 operates. The washing water heated by the heater 140 is injected into the tub 12 through at least one of the plurality of spraying arms 13, 14 and 15. The heater 140 may be disposed within the sump 100 according to an embodiment.

FIG. 2 is a block diagram of a dishwasher according to an embodiment of the present invention, and FIG. 3 is a view showing each stroke in a general washing course of a dishwasher according to an embodiment of the present invention.

The control unit 29 controls the water supply valve 22, the cleaning pump 150, the drain pump 25, the switching valve 130, and the heater 140 to perform cleaning on the object to be cleaned. The control unit 29 performs each stroke according to the washing course selected by the user.

In this embodiment, the controller 29 sequentially performs the preliminary cleaning 1 (P310), preliminary cleaning 2 (P320), preliminary cleaning 3 (P330), main cleaning (P340), rinsing (P350), and heating rinsing do.

The plurality of preliminary cleanings (P310, P320, P330) is a stroke for spraying wash water on the object to be cleaned to remove dirt attached to the object to be cleaned. In each of the plurality of preliminary cleanings (P310, P320, P330), the control unit 29 controls the water supply valve 22 to supply the wash water from the external water source into the sump 100. After the water supply, the control unit 29 operates the washing pump 150 to pressurize the washing water in the sump 100 and to control the switching valve 130 so as to discharge the washing water through at least one of the plurality of spraying arms 13, . The washing water sprayed through at least one of the plurality of spray guns 13, 14 and 15 collects the dirt attached to the object to be cleaned on the bottom 12b of the tub 12 and collects the dust on the filter 26. After spraying the washing water, the control unit 29 operates the drain pump 25 to drain the washing water in the sump 100 to the outside.

In this embodiment, the preliminary cleaning (P310, P320, P330) is performed three times, but may be performed at various times at least once depending on the embodiment.

The main cleaning (P340) is a process for heating the object to be cleaned by spraying the heated cleaning water on the object to be cleaned and removing the dirt attached to the object to be cleaned. The control unit 29 controls the water supply valve 22 to supply the washing water from the external water source to the sump 100 and then controls the heater 140 to heat the washing water, And discharges the washing water in the sump 100 to the outside by operating the drain pump 25 after spraying the heated washing water through at least one of the plurality of spray guns 13, During this wash (P340), the detergent may be mixed with the wash water.

The rinsing (P350) is a stroke for removing residual dirt attached to the object to be cleaned. The control unit 29 controls the water supply valve 22 to supply the washing water from the external water source to the sump 100 and then operates the washing pump 150 to apply a plurality of spraying arms 13, And drains the washing water in the sump 100 to the outside by operating the drain pump 25. [ During rinsing (P350), the rinse detergent may be mixed with the wash water.

The heated rinse (P360) is a stroke for heating the object to be cleaned by spraying heated washing water on the object to be cleaned, and finally removing the residual dirt attached to the object to be cleaned. The control unit 29 controls the water supply valve 22 to supply the washing water from the external water source to the sump 100 and then controls the heater 140 to heat the washing water, And discharges the washing water in the sump 100 to the outside by operating the drain pump 25 after spraying the heated washing water through at least one of the plurality of spray guns 13,

FIG. 4 is a view illustrating a method of controlling the heating of a dishwasher according to an embodiment of the present invention.

The control unit 29 performs water supply (P361) of the heated rinsing (P360). The control unit 29 controls the water supply valve 22 to supply the sump 100 with the washing water from the external water source. When the control unit 29 opens the water supply valve 22, the wash water supplied from the external water source flows into the sump 100 through the water supply flow path 23. The control unit 29 controls the level of the washing water supplied to the sump 100 from the maximum rotation speed of the washing pump 150 to a level that allows filtration of dirt to be smoothly performed in the filter 200 The water supply valve 22 is controlled such that the level of the wash water can be higher than the level of the wash water (wash water circulating water level). The controller 29 closes the water supply valve 22 and terminates the water supply P361 when the washing water is supplied to the target water level.

When the water supply P361 is completed, the controller 29 performs the first top injection P362. In the first tower injection P362, the control unit 29 operates the heater 140 to heat the washing water. The control valve 130 is also connected to connect the washing water supply passage 180 and the top portion sandstone connecting passage 21 to connect the washing pump 150 to the top portion sandstone 15. The control unit 29 operates the washing pump 150 to pressurize the wash water stored in the sump 100 to the crushed stone sandstone 15. The control unit 29 ejects the heated washing water through the top fossil sand rocker 15 toward the upper rack 17.

The controller 29 controls the flow rate of the washing water supplied to the sump 100 from the first tower injection P362 to the level of the filterable water level and the level of the wash water circulation level Increase the number of revolutions gradually. When the number of revolutions of the cleaning pump 150 reaches the maximum target revolving speed, the controller 29 holds it for a predetermined time and then completes the first top injection P362.

When the first top injection P362 is completed, the controller 29 performs the first lower injection P363. In the first lower injection P363, the controller 29 continuously operates the heater 140 and controls the switching valve 130 to connect the washing water supply passage 180 and the lower-pressure sandstone connecting passage 18 And connects the cleaning pump 150 to the low-pressure sandstone 13. The control unit 29 lowers the rotation speed of the cleaning pump 150 to the extent that the cleaning water can be sprayed through the low-pressure sandstone 13 (the minimum target rotation speed). The control unit 29 operates without interruption after the first tower injection P362 while reducing the rotation speed of the cleaning pump 150 only to pressurize the washing water stored in the sump 100 to the lower atomizing sand 13. The control unit 29 injects the heated washing water through the low-pressure sandstone 13 toward the upper rack 16.

The control unit 29 temporarily stops the operation of the cleaning pump 150 after the rotation speed of the cleaning pump 150 reaches the minimum target rotation speed for a predetermined time and operates the cleaning pump 150 again to start the cleaning pump 150 ) Is controlled to be the minimum target rotation number. When the number of revolutions of the cleaning pump 150 reaches the minimum target revolving speed, the controller 29 maintains the number of revolutions of the cleaning pump 150 for a predetermined time and ends the first lower injection (P363).

When the first lower injection P363 is completed, the controller 29 performs the first variable injection P364. The controller 29 continuously operates the heater 140 and controls the switching valve 130 to connect the washing water supply passage 180 and the upper spray arm connecting passage 19 in the first variable injection P364 And connects the cleaning pump 150 to the upper spray arm 14. The control unit 29 changes the rotation speed of the cleaning pump 150 to a step. In the first variable injection (P364), the control unit (29) repeats the stepwise decrement of the number of rotations of the cleaning pump (150) in a stepwise manner. In the first variable injection (P364), when the control unit 29 changes the rotation number of the cleaning pump 150 to the stepwise shape, the rotational speed of the upper sprayer arm 14 is changed to the stepwise shape, Is changed.

The control unit 29 determines whether the rotation speed of the cleaning pump 150 is equal to or lower than the maximum target rotation speed of the cleaning pump 150 in the first tower injection P362 and the lowest rotation speed of the cleaning pump 150 in the first lower injection P363 The rotation number of the cleaning pump 150 is changed so as to be equal to or more than the target rotation number. The control unit 29 controls the rotation speed of the cleaning pump 150 to the maximum rotation number of the cleaning pump 150 in the first top injection P362 and the maximum rotation number of the cleaning pump 150 in the first low- Variable between numbers.

A detailed description of the first variable injection P364 will be given later with reference to FIG. 5 and the following.

The control unit 29 changes the rotation number of the cleaning pump 150 and operates without interruption after the first lower injection P363 so that the wash water stored in the sump 100 is sent to the upper spray arm 14 by pressure. The control unit 29 ejects the heated washing water through the upper spray arm 14 toward the upper rack 17 upward. The control unit 29 changes the rotation number of the cleaning pump 150 to a stepwise shape for a predetermined time and then ends the first variable injection P364.

When the first variable injection P364 is completed, the controller 29 performs the second top injection P365. In the second tower injection P365, the control unit 29 continuously operates the heater 140 and controls the switching valve 130 so that the cleaning pump 150 is purged from the tower 140, similarly to the first tower injection P362. Connects to the sandstone (15), and increases the rotation speed of the cleaning pump (150) to the maximum target rotation speed.

When the second top injection P365 is completed, the controller 29 performs the second low injection P366. In the second lower injection P366, the control unit 29 continuously operates the heater 140 and controls the switching valve 130 so as to discharge the cleaning pump 150 to the lower side, similarly to the second lower injection P366. Minute sandstone 13 and reduces the rotation speed of the cleaning pump 150 to the minimum target rotation speed. The controller 29 temporarily stops the operation of the cleaning pump 150 in the middle of maintaining the minimum number of revolutions of the cleaning pump 150 in the second lower injection P366.

When the second low-pressure injection P366 is completed, the controller 29 performs the second variable injection P367. In the second variable injection P367, the control unit 29 continuously operates the heater 140 and controls the switching valve 130 so as to move the cleaning pump 150 to the upper position in the same manner as the first variable injection P364, Minute sandstone 14, and changes the number of revolutions of the cleaning pump 150 to a stepped shape.

When the second variable injection P367 is completed, the control unit 29 performs the upper injection P368. In the upper injection P368, the control unit 29 stops the operation of the heater 140 and finishes the heating of the washing water. The interruption of the operation of the heater 140 can be made at the beginning or at the end of the upper injection P368. In the upper injection P368, the control unit 29 keeps the switch valve 130 after the second variable injection P367 to connect the cleaning pump 150 and the upper spray arm 14 to each other. In the upper injection P368, the control unit 29 operates the cleaning pump 150 after the second variable injection P367 without stopping, but keeps the rotation speed of the cleaning pump 150 constant. The control unit 29 determines whether or not the rotation number of the cleaning pump 150 is equal to the average value of the rotation number of the cleaning pump 150 in the second variable injection P367 (or the first variable injection P364) The control unit 29 controls the washing pump 150 to maintain the filterable water level and the washing water circulating water level and the washing water injection flow rate through the upper spray P368, The control unit 29 maintains the rotation number of the washing pump 150 and collects the washing water in the sump 100. The controller 29 maintains the rotation speed of the washing pump 150 for a predetermined time, ) To stop the upper injection P368.

When the upper injection P368 is completed, the control unit 29 performs the drainage (P369). The control unit 29 operates the drain pump 25 to drain the wash water stored in the sump 100 to the outside. When the control unit 29 operates the drain pump 25, the washing water stored in the sump 100 flows out of the case 11 through the drainage flow path 24. When all of the washing water stored in the sump 100 is drained, the controller 29 stops the operation of the drain pump 25 and finishes the heating rinse (P360).

In the above-described embodiment, the second top injection P365, the second low injection P366, and the second variable injection P367 may be omitted. In this case, after the first variable injection P364, the upper injection P368, And the multiple P369 can be sequentially performed.

Although the upper spraying arm 14 injects the washing water in the first variable injection P364 and the second variable injection P367 in the embodiment described above, It can be sprayed.

FIG. 5 is a view illustrating control of the rotation speed of the washing pump in the control method of the dishwasher according to the embodiment of the present invention, and FIG. 6 is a perspective view of the upper spinning arm of the dishwasher according to the embodiment of the present invention.

FIG. 5 shows the number of revolutions of the cleaning pump 150 over time in the first variable injection P364 and the second variable injection P367. In FIG. 5, x denotes a period in which the number of rotations of the cleaning pump 150 is changed, and y denotes a period of increment / decrement in which the number of rotations of the cleaning pump 150 is changed. z denotes the number of steps of increasing and decreasing the number of revolutions of the cleaning pump 150, and yz means the total increment / decrement of the change in the number of revolutions of the cleaning pump 150.

It is preferable that the period of change x of the rotation number of the cleaning pump 150 is equal to or larger than the maximum time of one revolution of the upper spray arm 14. The rotational speed w of the upper spray arm 14 changed in accordance with the rotational speed of the washing pump 150 is changed and the rotational speed w of the upper spray arm 14 when the rotational speed of the washing pump 150 is the lowest ) Is the lowest. When the rotational speed w of the upper jet of sandstone 14 is the lowest, the time during which the upper jet mill 14 rotates once is the maximum. It is preferable that the changing period (x) of the number of revolutions is equal to or larger than the time of one revolution at the minimum number of revolutions of the washing pump 150. [

The period of change (x) of the number of rotations of the cleaning pump 150 is equal to the period of time during which the number of rotations of the cleaning pump 150 is maintained. The spraying direction of the washing water sprayed from the nozzle 14a of the upper spraying arm 14 is kept constant when the rotational speed of the washing pump 150 is maintained so that the upper spraying arm 14 is rotated at least one turn So that the washing water is uniformly sprayed on the horizontal plane. In this embodiment, the period (x) of changing the rotation number of the cleaning pump 150 is 5 seconds.

The injection direction of the washing water can be evenly changed during the stepwise change in which the number of revolutions of the washing pump 150 is kept constant and then abruptly changed and maintained constant again. The jetting direction of the washing water is related not only to the opening direction of the nozzle 14a and the flow rate of the washing water depending on the rotational speed of the washing pump 150 but also to the rotational speed of the upper jetting arm 14. According to such a complex factor, the inventors of the present invention have found that the number of revolutions of the washing pump 150 is changed to the changing period x of the number of revolutions of the washing pump 150 as compared with the case where the number of revolutions of the washing pump 150 is gradually changed to linear or curved When the stepwise change was made, the direction of spraying the washing water was changed evenly, and the result was that the washing object was uniformly applied.

The washing pump 150 repeats the stepwise decrease in the number of revolutions after the stepwise increase. The number z of steps of increasing the number of revolutions of the cleaning pump 150 is preferably equal to the number z of steps of decreasing the number of revolutions. The number of revolutions of the washing pump 150 is increased or decreased such that the number of revolutions of the washing pump 150 is maintained for the changing period x at the average value (intermediate value between the maximum number of revolutions and the minimum number of revolutions) It is preferable that the number (z) of steps to be reduced is an even number.

It is preferable that the increasing and decreasing width y of each step when the number of revolutions of the cleaning pump 150 increases and decreases is constant. When the number of revolutions of the cleaning pump 150 is repeatedly increased or decreased in a stepwise manner, it is preferable that the total increase / decrease width yz of the change in the number of revolutions of the cleaning pump 150 is constant. In this embodiment, the number z of steps for increasing or decreasing the number of revolutions is 4, and the increment / decrement width y for each step is 200 RPM. Thus, in this embodiment, the total increase / decrease width yz is 800 RPM.

The inventors of the present invention have experimentally found that when the number of revolutions of the washing pump 150 is changed to a stepless stepped shape, the water level is drastically lowered, and the filterable water level and the wash water circulating water level are not secured or the washing water is sprayed through the nozzle 14a . However, as described above, when the number of rotations of the cleaning pump 150 is changed stepwise to be equal to the increment / decrement width y of the step and the number z of steps to be increased or decreased, the filterable water level and the wash water circulating water level And the washing water is continuously sprayed through the nozzle 14a.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It should be understood that various modifications may be made by those skilled in the art without departing from the spirit and scope of the present invention.

11: Case 12:
12a: Cleaning chamber 12b: Floor
12c: communication hole 13: low-angle sandstone
14: Upper section sandstone 15: Top part sandstone
22: Water supply valve 25: Drain pump
100: Sump 130: Switching valve
140: heater 150: cleaning pump
200: filter

Claims (22)

A method of controlling a dishwasher, comprising: a tub receiving a washing object; a plurality of spraying arms for spraying the washing water; a sump for storing washing water; and a washing pump for feeding washing water stored in the sump to the plurality of spraying arms In this case,
A water supply step of opening the water supply valve to supply wash water to the sump; And
And a variable spraying step of spraying washing water by at least one of the plurality of spraying arms by changing the rotational speed of the washing pump stepwise. The method according to claim 1,
Wherein in the variable injection step, the washing pump repeats the stepwise decrease in the number of revolutions after the stepwise increase. 3. The method of claim 2,
Wherein the number of rotations of the washing pump is decreased in the variable injection step. The method according to claim 1,
Wherein in the variable injection step, the cycle in which the number of revolutions is changed is constant. 5. The method of claim 4,
Wherein the spray guns in which the wash water is sprayed out of the plurality of spray guns are formed into a bar shape and rotate,
Wherein in the variable injection step, the washing pump has a period of time in which the number of rotations is changed is equal to or greater than a maximum time during which the spray gun rotates once. 5. The method of claim 4,
Wherein the spray guns in which the wash water is sprayed out of the plurality of spray guns are formed into a bar shape and rotate,
Wherein the period in which the rotation number of the cleaning pump is changed in the variable injection step is equal to or longer than a period of time during which the rotary atomizing sand rotates once at the minimum rotation number of the cleaning pump. The method according to claim 1,
Wherein the washing pump in the variable spraying step has a constant increasing / decreasing width of the number of revolutions. The method according to claim 1,
Wherein the plurality of spraying fountains comprise upper spraying rockers disposed at an intermediate portion of the tub and spraying wash water,
Wherein the washing pump pumps the washing water to the upper spray gun in the variable spraying step. 9. The method of claim 8,
The upper spray gun is formed into a bar shape and rotates,
Wherein in the variable injection step, the rotational speed of the upper spray gun is changed stepwise. 9. The method of claim 8,
Wherein the spraying direction of the wash water in the upper spray gun changes stepwise in the variable spraying step. 9. The method of claim 8,
Wherein the plurality of atomizing fountains are arranged in a plane,
A top fission sandstone disposed at the top of the tub and spraying washing water downward; And
Further comprising a low-pressure sandstone disposed at a lower end of the tub for spraying wash water upward,
A top spraying step of operating the washing pump to pressurize the washing water stored in the sump to the top fractional sandstone; And
Further comprising: a low-stage injection step of operating the washing pump to pump wash water stored in the sump to the low-
Wherein the rotation number of the cleaning pump in the variable injection step is not more than the maximum rotation number of the cleaning pump in the top injection step and the maximum rotation number of the cleaning pump in the bottom injection step. The method according to claim 1,
An upper injection step of keeping the number of revolutions of the cleaning pump constant after the variable injection step; And
Further comprising a drain step of stopping the operation of the washing pump after the upper spraying step and draining the washing water stored in the sump to the outside. 13. The method of claim 12,
Wherein in the upper spraying step, the washing pump maintains an average value of the number of revolutions in which the number of revolutions is changed in the variable injection step. The method according to claim 1,
Further comprising a heating step of heating the washing water supplied to the sump,
Wherein the variable jetting step injects the heated washing water by at least one of the plurality of spraying arms. 15. The method of claim 14,
Wherein the water supply step, the heating step and the variable injection step are a heating and rinsing step,
Further comprising a rinsing step of mixing the rinsing water supplied from the external water source with the rinsing detergent to spray at least one of the plurality of fountains before discharging the rinsing water before the heating rinsing step. A tub in which the object to be cleaned is received;
A plurality of spraying arms disposed above and below spraying wash water into the tub;
A sump in which wash water is stored;
A washing pump for feeding washing water stored in the sump to at least one of the plurality of spraying arms; And
And a controller for controlling the cleaning pump and the heater,
Wherein the controller operates the heater and changes the rotational speed of the washing motor to a stepped shape to spray washing water from at least one of the plurality of spraying arms. 17. The method of claim 16,
Wherein the control unit repeats the stepwise deceleration after increasing the rotation speed of the cleaning pump in a stepwise manner. 17. The method of claim 16,
Wherein the controller changes the number of revolutions of the washing pump to a predetermined period. 17. The method of claim 16,
Wherein the control unit changes the rotation speed of the cleaning pump to a constant increase / decrease width. 17. The method of claim 16,
Further comprising a switching valve for selectively connecting the cleaning pump with at least one of the plurality of spraying arms,
Wherein the plurality of spraying fountains comprise upper spraying rockers disposed at an intermediate portion of the tub and spraying wash water,
Wherein the control unit controls the switching valve to connect the washing pump to the upper spray gun when the rotational speed of the washing motor is changed to a stepwise shape. 17. The method of claim 16,
Further comprising a drain pump for draining the wash water stored in the sump to the outside,
Wherein the control unit changes the rotation speed of the cleaning motor to a stepwise shape and keeps it constant, and operates the drain pump after stopping the operation of the cleaning motor. 17. The method of claim 16,
Further comprising a heater for heating wash water sprayed onto the plurality of spray guns,
Wherein at least one of the plurality of spray guns ejects the washing water heated by the heater.

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