KR102408615B1 - Dishwasher and Controlling method therefor - Google Patents

Abstract

The present invention relates to a dishwasher for washing dishes or cooking utensils by spraying washing water, and a method for controlling the same. A method for controlling a dishwasher according to an embodiment of the present invention includes the steps of supplying washing water to a sump by opening a water supply valve, and changing the rotation speed of the washing pump in a stepwise manner so that at least one of a plurality of spray arms receives washing water. Including the variable spraying step of spraying, the washing water can be evenly sprayed to the washing object.

Description

Dishwasher and control method therefor

The present invention relates to a dishwasher and a method for controlling the same, and more particularly, to a dishwasher for washing dishes or cooking utensils by spraying washing water, and a method for controlling the same.

A dishwasher is a home appliance that washes contaminants such as food residues on dishes or cooking utensils (hereinafter, 'to be washed') by high-pressure washing water sprayed from a jet arm.

A dishwasher generally includes a tub forming a washing chamber and a sump mounted on the bottom of the tub to store washing water. Then, the washing water is moved to the jet arm by the pumping action of the washing pump mounted inside the sump, and the washing water moved to the jet arm is injected at high pressure through the jet port formed in the jet arm. Then, the washing water sprayed at high pressure collides with the surface of the washing target, and the dirt on the washing target falls to the bottom of the tub.

Meanwhile, in the dishwasher, rinsing is performed to remove residual dirt by spraying washing water to the object to be washed. During the rinsing, in the final rinsing in which heated washing water is sprayed, all residual dirt should be removed as much as possible. Accordingly, it is required that the washing water is evenly sprayed on the washing object. Korean Patent Registration No. KR 10-1202072 discloses a control method of a dishwasher that performs a washing cycle.

SUMMARY OF THE INVENTION An object of the present invention is to provide a dishwasher in which a spray range of washing water is variable during rinsing and a method for controlling the same.

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

In order to achieve the above object, a control method of a dishwasher according to an embodiment of the present invention includes a water supply step of supplying washing water to a sump by opening a water supply valve, and a plurality of minutes by changing the rotation speed of the washing pump in a stepwise manner. At least one of the sandstone includes a variable spraying step in which the washing water is sprayed, so that the washing water can be evenly sprayed to the washing object.

In the variable injection step, the washing pump may repeat the number of rotations increasing stepwise and then decreasing stepwise.

In the variable injection step, the number of steps in which the rotational speed of the washing pump increases may be the same as the number of steps in which the number of steps decreases.

In the variable injection step, the cycle in which the rotation speed of the washing pump is changed may be constant.

In the variable injection step, the cycle of changing the number of rotations of the washing pump may be greater than or equal to the maximum time during which the rotating injection arm rotates once.

In the variable injection step, the cycle of changing the rotational speed of the washing pump may be longer than the time during which the rotating injection arm rotates once at the lowest rotational speed of the washing pump.

In the variable injection step, the washing pump may have a constant increase/decrease width in each step of the rotation speed.

In the variable jet stage, the washing pump can pump the washing water to the upper jet arm.

In the variable injection stage, the rotation speed of the upper injection arm can be changed in a stepwise manner.

In the variable spraying step, the spraying direction of the washing water in the upper spraying arm may be changed to a stepped shape.

The rotational speed of the washing pump in the variable injection step may be less than or equal to the maximum rotational speed of the washing pump in the top injection step and greater than or equal to the maximum rotational speed of the washing pump in the lower injection step.

The control method of the dishwasher further includes an upper injection step of maintaining a constant rotational speed of the washing pump after the variable jetting step, and a draining step of stopping the operation of the washing pump after the upper jetting step and draining the washing water stored in the sump to the outside. may include

In the upper injection step, the washing pump may maintain an average value of the number of rotations at which the number of rotations is changed in the variable injection step.

The control method of the dish washing machine may further include a heating step of heating the washing water supplied to the sump, and in the variable spraying step, at least one of the plurality of jet arms may spray the heated washing water.

The water supply step, the heating step, and the variable spray step are a heating rinsing cycle, and in the control method of the dishwasher, the washing water supplied from an external water source is mixed with a rinsing detergent before the heat rinsing cycle is performed, and at least one of the plurality of spray arms is sprayed after It may further include a rinsing cycle for draining.

In order to achieve the above object, a dish washing machine according to an embodiment of the present invention includes a tub, a plurality of jet arms disposed vertically to spray washing water in the tub, a sump in which washing water is stored, and a plurality of washing water stored in the sump. a washing pump that pumps pressure to at least one of the jet arms of Washing water can be sprayed.

The controller may repeatedly increase the number of rotations of the washing pump in a stepwise manner and then decelerate in a stepwise manner.

The control unit may change the rotation speed of the washing pump at a constant cycle.

The control unit may change the rotation speed of the washing pump by a constant increase/decrease width.

The control unit may connect the washing pump to the upper injection arm by controlling the switching valve when changing the rotation speed of the washing motor to a step type.

The control unit may change the rotation speed of the washing motor to a step type and then maintain it constant, and may operate the drain pump after stopping the operation of the washing motor.

The dishwasher may further include a heater for heating the washing water sprayed to the plurality of jet arms, and at least one of the plurality of jet arms may jet the washing water heated by the heater.

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

According to the dishwasher and the control method thereof of the present invention, there are one or more of the following effects.

First, there is an advantage in that the washing water can be evenly sprayed on the washing object by varying the number of rotations of the washing pump that pumps washing water to the jet arm that sprays washing water in a stepwise manner to vary the spray range of the washing water in a stepwise fashion.

Second, there is an advantage in that the number of rotations of the washing pump can be varied with the same cycle and the same increase/decrease width to secure the filterable water level and the washable water circulating water level.

Third, the number of rotations of the washing pump is changed, but the number of rotations is maintained while the washing arm rotates at least once, so that the washing arm can rotate at least once in the spraying direction of the constant washing water.

Fourth, there is also the advantage of increasing the rinsing performance by repeatedly increasing and decreasing the number of rotations of the washing pump in a stepwise fashion between the injection pressure at which the washing water is injected to the washing arm and the injection pressure that can secure the lowest water level.

Fifth, there is an advantage in that the number of rotations of the washing pump is changed in a stepwise manner, and the number of rotations is maintained at a constant level to collect waste before draining into the filter and to stably collect the washing water into the sump.

Sixth, there is also an advantage of completely removing the remaining dirt on the washing target by evenly spraying the washing water on the washing target in the final step of spraying the heated washing water.

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

1 is a cross-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 process in a general washing course of a dishwasher according to an embodiment of the present invention.
4 is a diagram illustrating a control method during heating and rinsing of a dishwasher according to an embodiment of the present invention.
5 is a view showing the control of the rotation speed of the washing pump in the control method of the dishwasher according to an embodiment of the present invention.
6 is a perspective view of an upper injection arm of a dishwasher according to an embodiment of the present invention.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the art to which the present invention pertains It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout.

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

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

Dishwasher 1 according to an embodiment of the present invention includes a case 11 forming an exterior, a tub 12 in which a washing object is accommodated, and a front surface of the tub 12 to open and close the tub 12 . a door 20, a sump 100 disposed below the tub 12 to store washing water, a plurality of spray arms 13, 14, 15 for spraying washing water into the tub 12, and a plurality of A filter 200 for filtering the washing water sprayed from at least one of the jet arms 13, 14, and 15 and returned to the sump 100, a washing pump 150 for pressurizing the washing water stored in the sump 100, and washing and a switching valve 130 for flowing the washing water pressurized by the pump 150 to at least one of the plurality of injection arms 13 , 14 and 15 .

The tub 11 is formed in a hexahedral shape with an open front 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 and 17 in which the object to be washed is accommodated. The plurality of racks 16 and 17 include a lower rack 16 disposed below the washing chamber 12a and an upper rack 17 disposed above. The lower rack 16 and the upper rack 17 are vertically spaced apart, and can be pulled out by sliding forward of the tub 11 .

A plurality of injection arms (13, 14, 15) are arranged in the vertical direction. A plurality of spray arms (13, 14, 15) are disposed at the lower end of the washing chamber (12a) and spray the washing water from the lower side to the upper side toward the lower rack (16), the lower spray arm (13), the lower spray arm ( 13) is disposed in the middle portion in the height direction of the washing chamber 12a, which is the upper side of the upper side of the upper jet arm 14, which sprays washing water from the bottom to the top toward the upper rack 17, and the upper side of the upper jet arm 14 It is disposed on the upper end of the washing chamber (12a) and includes a top spray arm (15) for spraying washing water from the upper side to the lower side toward the upper rack (17). The lower blast arm 13 is disposed below the lower rack 16 , the upper blast arm 14 is disposed between the upper rack 17 and the lower rack 16 , and the top blast arm 15 is the upper rack (17) is arranged on the upper side. According to the embodiment, the upper injection arm 14 may be sprayed downward toward the lower rack 16 , and may be simultaneously sprayed upward and downward toward both the upper rack 17 and the lower rack 16 .

Each of the lower injection arm 13 and the upper injection arm 14 rotates around the center of the bar in a bar shape. Each of the lower injection arm 13 and the upper injection arm 14 rotates by supply of washing water. A nozzle (not shown) is formed on the upper surface of each of the lower injection arm 13 and the upper injection arm 14 .

The plurality of jet arms 13 , 14 , and 15 receive washing water from the washing pump 150 through the plurality of jet arm connection passages 18 , 19 , and 21 . The plurality of injection arm connection passages 18, 19 and 21 include a lower injection arm connection passage 18 connected to the lower injection arm 13, an upper injection arm connection passage 19 connected to the upper injection arm 14, and It includes a top spray rock connection passage 21 connected to the top spray rock (15).

The lower blast arm 13, the upper blast arm 14, and the top blast arm 15 are wash pumps through the lower blast arm connection passage 18, the upper blast arm connection passage 19, and the top blast arm connection passage 21, respectively. Washing water is supplied from 150.

The sump 100 is disposed below the bottom 12b of the tub 12 to collect washing water. The sump 100 is connected to the water supply passage 23 through which the washing water supplied from the external water source flows. The water supply passage 23 is provided with a water supply valve 22 for controlling the 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 passage 23 .

The sump 100 is connected to a drain passage 24 that guides the stored washing water to the outside of the dishwasher 1 . A drain pump 25 for draining the washing water in the sump 100 through the drain passage 24 is provided in the drain passage 24 . The drain pump 25 includes a drain motor (not shown) that generates a rotational force. When the drain pump 25 operates, the washing water stored in the sump 100 flows out of the case 11 through the drain passage 24 .

The filter 200 is mounted in the communication hole 12c to filter dirt from the washing water moving from the tub 12 to the sump 100 . In the filter 200 , the mesh-formed lower part is inserted into the sump 100 , and the opened upper part protrudes toward the upper side of the tub 12 . Washing water sprayed through the plurality of spray arms 13, 14, and 15 falls to the bottom 12b of the tub 12 together with the dirt on the object to be washed. Washing water flowing over the bottom 12b of the tub 12 flows into the upper part of the filter 200 , passes through the lower mesh, and is stored in the sump 100 after the waste is filtered. In order for the filter 200 to smoothly filter the dirt, the level of the washing water stored in the sump 100 needs to be maintained above the lower end of the filter 200 .

The switching valve 130 selectively supplies the washing water pumped by the washing pump 150 to at least one of the lower injection arm 13 , the upper injection arm 14 , and the top injection arm 15 . The switching valve 130 selectively connects at least one of the washing water supply passage 180 and the plurality of injection arm connection passages 18 , 19 , and 21 .

The washing pump 150 supplies the washing water stored in the sump 100 to at least one of the plurality of spray arms 13 , 14 , and 15 . The washing pump 150 includes a washing motor 157 that generates a rotational force, and an impeller 155 that is rotated by the washing motor 157 to pressurize washing water. The washing motor 157 is a motor whose RPM can be varied, and a change in the number of rotations (the number of rotations with respect to time) of the washing pump 150 means a change in the RPM of the washing motor 157 . The washing pump 150 may maintain the rotation speed or change the rotation speed during operation. The rotation speed of the washing pump 150 is proportional to the flow rate of the washing water pumped by the washing pump 150 . When the rotation speed of the washing pump 150 is changed, the injection direction of the washing water sprayed from at least one of the plurality of injection arms 13 , 14 , and 15 connected to the washing pump 150 is changed. When the washing pump 150 is connected to at least one of the lower injection arm 13 and the upper injection arm 14, if the rotation speed of the washing pump 150 is changed, the lower injection arm 13 and/or the upper injection arm 14 ), the rotational speed is changed.

The washing pump 150 is connected to the sump 100 and the water collecting passage 170 . The washing pump 150 is connected to the switching valve 130 and the washing water supply passage 180 . When the washing pump 150 is operated, the washing water stored in the sump 100 flows into the washing pump 150 through the water collecting flow path 170 and then is pressurized to the switching valve 130 through the washing water supply path 180 . Since the water collecting passage 170 is connected to the side of the washing pump 150, the level of the washing water stored in the sump 100 so that the washing water flows into the washing pump 150 during the operation of the washing pump 150 is 170) needs to be maintained beyond the connecting part.

The heater 140 is coupled to the lower side of the washing pump 150 to heat the washing water in the washing 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 sprayed into the tub 12 through at least one of the plurality of spray arms 13 , 14 , and 15 . According to an embodiment, the heater 140 may be disposed inside the sump 100 .

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

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

In this embodiment, the control unit 29 sequentially performs preliminary washing 1 (P310), preliminary washing 2 (P320), preliminary washing 3 (P330), main washing (P340), rinsing (P350) and heat rinsing (P360). do.

The plurality of preliminary washings (P310, P320, and P330) is a process of spraying washing water to the washing target to remove dirt attached to the washing target. In each of the plurality of preliminary washings P310 , P320 , and P330 , the controller 29 controls the water supply valve 22 to supply washing water from an external water source into the sump 100 . After supplying water, the control unit 29 operates the washing pump 150 to pump the washing water in the sump 100 and controls the switching valve 130 to provide washing water through at least one of the plurality of spray arms 13, 14, and 15. spray the The washing water sprayed through at least one of the plurality of jet arms (13, 14, 15) drops the dirt attached to the washing object to the bottom (12b) of the tub (12) and collects it in the filter (26). After the washing water is sprayed, 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 washing (P310, P320, P330) is exemplified to be performed three times, but may be performed at least once or more various times according to the embodiment.

The main washing (P340) is a process of spraying heated washing water to the washing target to heat the washing target and removing dirt attached to the washing target. In the main washing (P340), the control unit 29 controls the water supply valve 22 to supply washing water from an external water source to the sump 100, then controls the heater 140 to heat the washing water, and the washing pump 150. to spray the heated washing water through at least one of the plurality of jet arms 13 , 14 , and 15 , and then operate the drain pump 25 to drain the washing water in the sump 100 to the outside. During the main washing (P340), a washing detergent may be mixed with washing water.

The rinsing ( P350 ) is a process of removing residual dirt attached to the object to be washed. In the rinsing (P350), the controller 29 controls the water supply valve 22 to supply washing water from an external water source to the sump 100, and then operates the washing pump 150 to operate the plurality of spray arms 13, 14, 15 ), the washing water is sprayed through at least one, and the drain pump 25 is operated to drain the washing water in the sump 100 to the outside. During rinsing (P350), a rinsing detergent may be mixed with washing water.

Heat rinsing (P360) is a process of spraying heated washing water to the washing target to heat the washing target, and finally removing the residual dirt attached to the washing target. In the heat rinsing (P360), the controller 29 controls the water supply valve 22 to supply washing water from an external water source to the sump 100, then controls the heater 140 to heat the washing water, and the washing pump 150. to spray the heated washing water through at least one of the plurality of jet arms 13 , 14 , and 15 , and then operate the drain pump 25 to drain the washing water in the sump 100 to the outside.

4 is a diagram illustrating a control method during heating and rinsing of a dishwasher according to an embodiment of the present invention.

The control unit 29 performs water supply (P361) of the heat rinsing (P360). The control unit 29 controls the water supply valve 22 to supply washing water from an external water source to the sump 100 . When the control unit 29 opens the water supply valve 22 , the washing water supplied from the external water source flows into the sump 100 through the water supply passage 23 . The control unit 29 determines that the level of the washing water supplied to the sump 100 at the highest rotational speed of the washing pump 150 is the water level at which the filter 200 can smoothly filter the dirt (filterable water level) and the washing pump By 150, the water supply valve 22 is controlled to be higher than the level at which the washing water can flow (the level at which the washing water can be circulated). When the washing water is supplied to the target water level, the control unit 29 closes the water supply valve 22 and ends the water supply P361.

When the water supply (P361) is completed, the control unit 29 performs the first tower spray (P362). In the first top spray (P362), the control unit 29 operates the heater 140 to heat the washing water. In addition, by controlling the switching valve 130 to connect the washing water supply flow path 180 and the top jet arm connection flow path 21 , the washing pump 150 is connected to the top jet arm 15 . The control unit 29 operates the washing pump 150 to pressurize the washing water stored in the sump 100 to the top spray arm 15 . The control unit 29 sprays the washing water heated through the top spray arm 15 downward toward the upper rack 17 .

The control unit 29 controls the washing pump 150 until the level of the washing water supplied to the sump 100 is lowered in the first tower injection P362 to reach the filterable water level and the washing water circulating water level (the highest target rotational speed). Gradually increase the rotation speed. When the rotation speed of the washing pump 150 reaches the highest target rotation speed, the control unit 29 maintains it for a predetermined time and then completes the first tower spraying (P362).

When the first top injection (P362) is completed, the control unit 29 performs the first lower injection (P363). In the first lower injection (P363), the control unit 29 continuously operates the heater 140 and controls the switching valve 130 to connect the washing water supply flow path 180 and the lower injection arm connection flow path 18. The washing pump 150 is connected to the lower injection arm 13 . The control unit 29 lowers the rotation speed of the washing pump 150 to the extent that the washing water can be sprayed through the lower injection arm 13 (the minimum target rotation speed). The control unit 29 operates without interruption after the first top injection (P362) with the washing pump 150 lowering only the rotational speed to pressurize the washing water stored in the sump 100 to the lower injection arm 13 . The control unit 29 sprays the washing water heated through the lower spray arm 13 upward toward the lower rack 16 .

When the rotation speed of the washing pump 150 reaches the minimum target rotation speed, the control unit 29 maintains it for a predetermined time, then temporarily stops the operation of the washing pump 150 and operates the washing pump 150 again to operate the washing pump 150 ) is controlled to be the lowest target rotation speed. When the rotation speed of the washing pump 150 reaches the minimum target rotation speed, the control unit 29 maintains it for a predetermined time and then ends the first lower injection (P363).

When the first lower injection (P363) is completed, the control unit 29 performs the first variable injection (P364). In the first variable injection (P364), the control unit 29 continuously operates the heater 140 and controls the switching valve 130 to connect the washing water supply flow path 180 and the upper jet arm connection flow path 19. The washing pump 150 is connected to the upper injection arm 14 . The control unit 29 changes the number of rotations of the washing pump 150 in a stepwise manner. In the first variable injection (P364), the control unit 29 repeatedly increases the rotation speed of the washing pump 150 in a stepwise manner and then decreases in a stepwise manner. In the first variable injection (P364), when the control unit 29 changes the rotation speed of the washing pump 150 to a step shape, the rotation speed of the upper jet arm 14 is changed to a step shape, and the spray direction of the washing water is also changed to a step shape. is changed

The controller 29 determines that the rotation speed of the washing pump 150 is less than or equal to the highest target rotation speed of the washing pump 150 in the first top injection P362 and the lowest rotation speed of the washing pump 150 in the first lower injection P363. The rotational speed of the washing pump 150 is changed so that it becomes more than the target rotational speed. The control unit 29 sets the rotation speed of the washing pump 150 to the highest rotation speed of the washing pump 150 in the first top injection (P362) and the highest rotation speed of the washing pump 150 in the first lower injection (P363). vary between numbers.

A detailed description of the first variable injection P364 will be described later with reference to FIG. 5 or less.

The control unit 29 changes only the rotation speed of the washing pump 150 and operates without interruption after the first lower injection P363 to pressurize the washing water stored in the sump 100 to the upper injection arm 14 . The control unit 29 sprays the washing water heated through the upper spray arm 14 upward toward the upper rack 17 . The control unit 29 ends the first variable injection (P364) after changing the number of rotations of the washing pump 150 to a step type for a predetermined time.

When the first variable injection (P364) is completed, the control unit 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, in the same manner as in the first tower injection (P362), to turn the washing pump 150 into the top portion. It is connected to the sandstone 15 and increases the rotation speed of the washing pump 150 to the highest target rotation speed.

When the second top injection (P365) is completed, the control unit 29 performs the second lower injection (P366). In the second lower injection (P366), the controller 29 continuously operates the heater 140 and controls the switching valve 130 to lower the washing pump 150 in the same manner as in the second lower injection (P366). It is connected to the injection arm 13 and lowers the rotation speed of the washing pump 150 to the lowest target rotation speed. Even in the second lower injection (P366), the control unit 29 temporarily stops the operation of the washing pump 150 while the rotational speed of the washing pump 150 maintains the lowest target rotational speed.

When the second lower injection (P366) is completed, the control unit 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 to turn the washing pump 150 to the upper, in the same manner as in the first variable injection (P364). It is connected to the injection arm 14, and the number of rotations of the washing pump 150 is changed to a step type.

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 to end the heating of the washing water. The operation of the heater 140 may be stopped at the beginning or end of the upper injection (P368). In the upper injection (P368), the control unit 29 maintains the switching valve 130 to connect the washing pump 150 and the upper injection arm 14 after the second variable injection (P367). In the upper injection (P368), the control unit 29 operates the washing pump 150 without interruption after the second variable injection (P367), but maintains the rotational speed of the washing pump 150 constant. The controller 29 determines that the number of rotations of the washing pump 150 is the average value (or the highest and lowest rotations) of the rotations of the washing pump 150 in the second variable injection P367 (or the first variable injection P364). In the upper injection (P368), the control unit 29 controls the filterable water level, the wash water circulating water level, and the washing pump 150 to secure the washing water injection flow rate through the upper injection (P368). By maintaining the rotational speed of the filter 200, dirt is collected in the sump 100, and washing water is collected in the sump 100. The control unit 29 maintains the rotational speed of the washing pump 150 for a predetermined time, and then the washing pump 150 ) to stop the upper injection (P368).

When the upper injection (P368) is completed, the control unit 29 performs drainage (P369). The controller 29 operates the drain pump 25 to drain the washing 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 drain passage 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 to end the heat rinsing (P360).

In the above-described embodiment, the second top injection (P365), the second lower injection (P366) and the second variable injection (P367) may be omitted, and in this case, after the first variable injection (P364), the upper injection (P368) and The drainage P369 may be sequentially performed.

In the above-described embodiment, in the first variable injection (P364) and second variable injection (P367) steps, it has been described that the upper injection arm 14 sprays the washing water, but according to the embodiment, the lower injection arm 13 sprays the washing water. can be sprayed

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

5 shows the number of rotations of the washing pump 150 according to time during the first variable injection (P364) and the second variable injection (P367). In FIG. 5 , x denotes a cycle in which the rotational speed of the washing pump 150 is changed, and y denotes a step-by-step increase/decrease in which the rotational speed of the washing pump 150 is changed. z denotes the number of steps in which the rotational speed of the washing pump 150 increases and decreases, and yz denotes the overall increase/decrease width of the change in the rotational speed of the washing pump 150 .

The change period (x) of the rotation speed of the washing pump 150 is preferably equal to or greater than the maximum time the upper injection arm 14 rotates once. The rotation speed w of the upper injection arm 14, which is changed according to the rotation speed of the washing pump 150, is changed, and the rotation speed w of the upper injection arm 14 when the rotation speed of the washing pump 150 is the lowest. ) is the lowest. When the rotation speed w of the upper injection arm 14 is the lowest, the time for one rotation of the upper injection arm 14 becomes the maximum. The change period (x) of the rotation speed is preferably equal to or greater than the time for one rotation at the lowest rotation speed of the washing pump 150 .

The change period (x) of the rotation speed of the washing pump 150 is the same as the time during which the rotation speed of the washing pump 150 is maintained. When the rotation speed of the washing pump 150 is maintained, the injection direction of the washing water sprayed from the nozzle 14a of the upper injection arm 14 is kept constant, so that the upper injection arm 14 performs at least one rotation in the same injection direction. The washing water is sprayed evenly on the horizontal surface. In this embodiment, the change period (x) of the rotation speed of the washing pump 150 is 5 seconds.

When the number of rotations of the washing pump 150 is maintained constant and then changed abruptly to a step-like change that is kept constant again, the injection direction of the washing water may be uniformly changed. The spraying direction of the washing water is related to the opening direction of the nozzle 14a and the flow rate of the washing water according to the rotation speed of the washing pump 150 as well as the rotational speed of the upper jet arm 14 . According to these complex factors, the inventors of the present invention, through experiments, change the number of rotations of the washing pump 150 to the change period (x) of the above-described washing pump 150 rather than the case where the rotation speed of the washing pump 150 is gradually changed in a linear or curved shape. When changing to a step type, the spray direction of the washing water was changed evenly to obtain a result of uniformly acting on the washing object.

The washing pump 150 repeats that the number of rotations increases in a stepwise manner and then decreases in a stepwise manner. It is preferable that the number (z) of the steps in which the rotation speed of the washing pump 150 is increased is equal to the number (z) of the steps in which the rotation speed is decreased. The number of rotations of the washing pump 150 is increased or It is preferable that the number of steps to be reduced (z) is an even number.

When the rotation speed of the washing pump 150 increases and decreases, it is preferable that the increase/decrease width (y) for each step is constant. When the number of rotations of the washing pump 150 is repeatedly increased or decreased in a stepwise manner, it is preferable that the overall increase/decrease width yz of the change in the number of rotations of the washing pump 150 is constant. In this embodiment, the number (z) of the steps for increasing or decreasing the rotation speed is 4, and the increase/decrease width (y) for each step is 200 RPM. Accordingly, in this embodiment, the total increase/decrease width yz is 800 RPM.

The inventors of the present invention, through experiments, when changing the rotational speed of the washing pump 150 to an irregular step shape, the water level is abruptly lowered, so that the filterable water level and the washing water circulating water level are not secured or the washing water is sprayed through the nozzle 14a I got an inconsistent result. However, as described above, when the number of rotations of the washing pump 150 is changed to a constant step type by equalizing the step-by-step increase/decrease width (y) and the number of steps (z) to increase/decrease, the filterable water level and the washing water circulating water level The result was obtained that the washing water was continuously sprayed through the nozzle 14a while securing the .

In the above, preferred embodiments of the present invention have been illustrated and described, but the present invention is not limited to the specific embodiments described above, and in the technical field to which the present invention belongs, without departing from the gist of the present invention as claimed in the claims Various modifications may be made by those of ordinary skill in the art, and these modifications should not be individually understood from the technical spirit or perspective of the present invention.

11: Case 12: Tub
12a: washing room 12b: floor
12c: communication hole 13: lower sandstone
14: Upper Sandstone 15: Top Sandstone
22: water supply valve 25: drain pump
100: sump 130: selector valve
140: heater 150: washing pump
200: filter

Claims (22)

A tub for receiving a washing object, a plurality of jet arms for spraying washing water, a sump for storing washing water, and a washing pump for pressurizing the washing water stored in the sump to the plurality of jet arms, wherein the plurality of jet arms In the control method of a dishwasher comprising: a silver upper blast arm; a top blast arm disposed on an upper side of the upper blast arm;
a water supply step of supplying washing water to the sump by opening a water supply valve;
By operating the washing pump, the washing water stored in the sump is pumped to the top spray arm, and the number of rotations of the washing pump is increased stepwise up to the maximum target rotation speed at which the level of the washing water supplied to the sump reaches the washing water circulating level. top spraying step;
a lower jet step of operating the washing pump to pump the washing water stored in the sump to the lower jet arm, and lowering the rotation speed of the washing pump to the lowest target rotation speed at which the washing water can be sprayed through the lower jet arm; and
A variable jetting step of operating the washing pump to pump the washing water stored in the sump to the upper jet arm, and changing the number of rotations of the washing pump in a stepwise manner so that at least one of the plurality of jet arms jets washing water do,
In the variable spraying step, the control method of the dishwasher for varying the rotation speed of the washing pump between the highest target rotation speed and the lowest target rotation speed. The method of claim 1,
A control method of a dishwasher in which the number of rotations of the washing pump in the variable spraying step increases in a stepwise manner and then decreases in a stepwise manner. 3. The method of claim 2,
In the variable injection step, the number of steps in which the number of rotations of the washing pump increases is the same as the number of steps in which the number of steps decreases. The method of claim 1,
In the variable spraying step, the washing pump has a constant cycle for changing the number of rotations of the washing pump. 5. The method of claim 4,
Among the plurality of jet arms, the jet arm to which the washing water is sprayed is formed in a bar shape and rotates,
In the variable spraying step, in the washing pump, a cycle in which the number of revolutions is changed is equal to or greater than a maximum time for which the rotating spray arm rotates once. 5. The method of claim 4,
Among the plurality of jet arms, the jet arm to which the washing water is sprayed is formed in a bar shape and rotates,
In the variable spraying step, a cycle in which the rotational speed of the washing pump is changed is equal to or longer than the time during which the rotating spray arm rotates once at the lowest rotational speed of the washing pump. The method of claim 1,
In the variable spraying step, the washing pump has a constant increase/decrease width for each step of the number of revolutions. delete The method of claim 1,
The upper injection arm is formed in a bar shape and rotates,
The control method of the dishwasher in which the rotation speed of the upper injection arm is changed in a stepwise manner in the variable injection step. The method of claim 1,
In the variable spraying step, the upper spraying arm controls the washing water in a stepwise manner in which the spraying direction is changed. delete The method of claim 1,
an upper injection step of maintaining a constant rotational speed of the washing pump after the variable injection step; and
and a draining 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,
In the upper spraying step, the washing pump maintains an average value of the number of revolutions at which the number of revolutions is changed in the variable spraying step. The method of claim 1,
Further comprising a heating step of heating the washing water supplied to the sump,
In the variable spraying step, at least one of the plurality of spray arms sprays the heated washing water. 15. The method of claim 14,
The water supply step, the heating step, and the variable spray step are a heating rinse cycle,
and a rinsing cycle of mixing washing water supplied from an external water source with a rinsing detergent before performing the heating rinsing cycle, and draining the washing water after at least one of the plurality of spray arms sprays. a tub in which the object to be washed is accommodated;
a plurality of spray arms that spray washing water into the tub and are vertically disposed;
a sump in which washing water is stored;
a washing pump that pressurizes the washing water stored in the sump to at least one of the plurality of jet arms; and
A control unit for controlling the washing pump,
The plurality of injection arms includes an upper injection arm, a top injection arm disposed on an upper side of the upper injection arm, and a lower injection arm disposed below the upper injection arm,
The control unit is
When the washing water stored in the sump is pumped to the top spray arm, the number of rotations of the washing pump is increased stepwise up to the highest target rotation speed at which the level of the washing water supplied to the sump reaches the washing water circulating water level,
When the washing water stored in the sump is pumped to the lower jet arm, the rotation speed of the washing pump is lowered to the lowest target rotation speed at which the washing water can be sprayed through the lower jet arm,
When the washing water stored in the sump is pressurized to the upper spray arm, the dishwasher changes the rotation speed of the washing pump in a stepwise fashion between the highest target rotation speed and the lowest target rotation speed. 17. The method of claim 16,
The control unit may increase the number of rotations of the washing pump in a stepwise manner and then repeat the stepwise deceleration. 17. The method of claim 16,
The controller is configured to change the rotation speed of the washing pump at a constant cycle. 17. The method of claim 16,
The controller is configured to change the rotation speed of the washing pump by a constant increase/decrease width. 17. The method of claim 16,
Further comprising a switching valve selectively connecting the washing pump to at least one of the plurality of injection arms,
The controller may control the switching valve to connect the washing pump to the upper jet arm when changing the number of revolutions of the washing motor in a stepwise manner. 17. The method of claim 16,
Further comprising a drain pump for draining the washing water stored in the sump to the outside,
The controller is configured to change the rotation speed of the washing motor to a step type and then to maintain it constant, and to operate the drain pump after stopping the operation of the washing motor. 17. The method of claim 16,
Further comprising a heater for heating the washing water sprayed to the plurality of spray arms,
At least one of the plurality of spray arms sprays the washing water heated by the heater.

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