KR20110057520A - Dish washer - Google Patents

Abstract

PURPOSE: A dish washer is provided to prevent the change of actual supplied water amount by the sensing error of a flow sensing part in each step, since the flow rate decision standard is newly calculated at each step. CONSTITUTION: The dish washer includes a first and a second sensing units(82,83), the flow sensing part(73), and a controller. The first and the second sensing units are arranged in the other location. The first and the second sensing units sense the amount quantity of specific washing water. A signal processing part outputs the signal according to the flow of the cleaning water while the amount of the cleaning water is detected in the first and the second sensing units. The controller decides the specific cleaning water amount and the flow per unit signal by using the signal outputted in the signal processing part.

Description

Dishwasher {Dish washer}

This embodiment relates to a dishwasher.

In general, the dishwasher is a device for washing dishes by high-pressure washing water sprayed from the washing nozzle.

The dishwasher includes a washing tank in which a washing space is formed, a sump provided below the washing tank to store the washing water, and a plurality of washing nozzles provided in the washing tank.

A water supply pipe and a drain pipe may be connected to the sump, and the water supply pipe may include a flow rate detection unit for detecting a flow rate of the washing water and a water supply valve. The flow meter may be a flow meter. The flow meter is rotated by the washing water passing through to generate a signal. The controller determines the amount of wash water supplied by the generated signal.

The washing water supplied to the sump is sprayed into the washing tank after being moved to the washing nozzle, and is moved to the sump again after being sprayed into the washing tank.

The dishwasher performs a plurality of strokes until the washing of the dishes is completed, and in at least one of the plurality of strokes, the washing water is supplied from the outside through the water supply pipe.

By the way, according to the conventional dishwasher, the signal generated by the flow meter is variable according to the pressure or flow rate of the washing water passing through the flow rate sensing unit, there is a problem that the water supply can not be supplied by the amount of water required in a specific stroke.

If the water is not supplied by the amount of water required in a specific stroke, there is a problem that the cleaning performance may be reduced.

An object of the present embodiment is to provide a dishwasher capable of supplying water by the required amount of water by determining the amount of washing water actually supplied and correcting the flow rate determination criteria.

In one embodiment, a dishwasher includes: a first detector and a second detector disposed at different positions to detect a specific amount of washing water between the two; A signal output unit which outputs a signal according to the flow of the washing water while the amount of the washing water is detected by the first and second sensing units; And a controller for determining a flow rate per unit signal by using the specific washing water amount and the signal output from the signal output unit.

According to another aspect of the present invention, a dishwasher includes: a washing tank in which dishes are accommodated; At least one washing nozzle provided in the washing tank to spray washing water into the dishware; Sump for supplying wash water to the at least one wash nozzle; A water supply passage for supplying the washing water to the sump from an external water supply source; A sensing unit for sensing a specific amount of the washing water supplied from the water supply source; A flow rate sensing unit provided on an upstream side of the sensing unit to output a signal according to the flow of the washing water while the specific amount of the washing water is detected; And a control unit for calculating a flow rate determination criterion using a specific amount of wash water detected by the detection unit and a signal output from the flow rate detection unit, and using the calculated flow rate determination criterion to supply the amount of wash water required by a specific stroke. Is included.

According to the proposed embodiment, the flow rate per unit pulse (flow rate determination standard) is newly calculated using the number of pulses output from the flow rate detection unit and the specific amount (absolute amount) of washing water detected by the detection unit, and the calculated flow rate determination criteria Since the water supply is performed based on the water supply, the water supply can be supplied exactly as much as the water supply required for the specific stroke.

In addition, since the flow rate determination criterion is newly calculated for every stroke in which water is supplied, it is possible to prevent the actual amount of water from being changed by the detection error of the flow rate sensing unit for each stroke.

Hereinafter, exemplary embodiments will be described in detail with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view of a dish washing machine according to a first embodiment, and FIG. 2 is a block diagram illustrating a configuration of a dish washing machine according to a first embodiment.

1 and 2, the dishwasher according to the present embodiment includes a case 1 forming an appearance and a washing tank provided in the case 1 and forming a washing space for washing dishes. (4), a sump (10) provided at the lower side of the washing tank (4) to collect washing water for washing dishes, and a door (2) for opening and closing the washing tank (4).

The control panel 3 for controlling the operation of the dish washing machine is provided on the upper side of the door 2.

Inside the washing tank 4, a plurality of racks on which tableware is placed are provided. The plurality of racks include an upper rack 11 and a lower rack 12 positioned below the upper rack 11. In this embodiment, the two racks 11 and 12 are described as an example in which the washing tank 18 is provided, but the number of the racks in this embodiment is not limited.

In addition, the washing tank 4 is provided with a plurality of washing nozzles for receiving the washing water from the sump 10 and spraying the washing water to the dishes placed on the racks 11 and 12.

The plurality of washing nozzles may include a lower nozzle 14 connected to an upper side of the sump 10 and an intermediate nozzle 15 positioned above the lower nozzle 14 to receive washing water from the sump 10. And a top nozzle 16 positioned above the intermediate nozzle 15 and receiving washing water from the sump 16.

The sump 10 is connected to a wash water guide 19 for delivering wash water to the intermediate nozzle 15 and the top nozzle 16. A single wash water flow path may be formed in the wash water guide 19, or two wash water flow paths may be partitioned.

The sump 10 may include a heating unit 20 for heating the supplied washing water, a temperature sensing unit 72 detecting a temperature of the washing water heated by the heating unit 20, and the inside of the sump 10. A washing pump 90 for pumping the washing water, a drain pump 50 for draining the washing water in the sump 10, and a flow passage adjusting unit (not shown) for adjusting a flow path of the washing water being pumped.

The flow path controller allows the washing water of the sump 10 to flow to one or more of the plurality of washing nozzles when the washing pump 90 is operated.

An inlet hole 17 for introducing the washing water may be formed at an upper side of the sump 10. The washing water sprayed from the washing nozzles 14, 15, and 16 is collected into the sump 10 through the inlet hole 17, and is again washed by the washing pump 90. 16) is supplied to one or more nozzles.

An air brake 60 is provided between the washing tank 4 and the case 1 to guide the flow of washing water and to allow external air to communicate with the air inside the washing tank 4. The air brake 60 communicates an air inlet 601 through which external air is sucked, an opening 602 communicating with the inside of the washing tank 4, and an air inlet 601 and the opening 602. A connection flow path 603 is included.

Therefore, the inside of the washing tank 4 can be maintained at an atmospheric pressure state by the air brake 60, and the inside of the washing tank 4 can be prevented from increasing in pressure by hot air.

The air brake 60 may have a first flow path 33 and a second flow path 35 partitioned from the connection flow path 603. The washing water supplied from the outside passes through the first flow passage 33 to the sump 10, and the washing water discharged from the sump 10 passes through the second flow passage 35 to the outside.

A water supply pipe 30 is connected to an inlet side of the first flow path 33, and a water softener 40 is connected to an outlet side of the first flow path 33. In addition, the softening device 40 is connected to the sump (10). In this embodiment, since the water supply pipe 30, the first flow path 33 and the softening device 40 flows the washing water to be supplied to the sump 10 from the outside, these will be collectively referred to as the water supply flow path. Can be.

A water supply valve 40 for adjusting the flow rate of the washing water and a flow rate sensing unit 73 for detecting the amount of the washing water flowing may be provided on the water supply passage.

In this embodiment, for example, the flow rate sensing unit 73 may be provided in the air brake 60, and the water supply valve 40 may be provided in the water supply pipe 30. However, in the present embodiment it is noted that there is no restriction on the position of the flow rate detection unit 73 and the water supply valve 40.

The inlet side of the drain passage 35 is connected to the connecting pipe 62 connected to the drain pump 50. The outlet side of the drain passage 35 is connected to the drain pipe 64 for discharging the washing water to the outside.

Meanwhile, a flow meter may be used as the flow rate detector 73. The flow meter is a sensor that turns the turbine and measures the flow rate as the fluid passes. When the wash water passes the flow meter, a pulse signal is generated.

The signal generated by the flow meter is transmitted to the control unit 70, and the control unit 70 controls the operation of the water supply valve 40 by using the transmitted pulse signal information. For example, the controller 70 determines the water supply amount using the generated pulse number, and controls the water supply valve 40 according to the determined water supply amount.

In the present embodiment, since the flow rate detection unit 73 outputs a pulse signal according to the flow of the washing water, it may be called a signal output unit.

The sump 10 further includes a sensing unit for sensing a specific amount of the washing water supplied. The control unit 70 maintains or corrects a flow rate determination criterion (to be described later) by using the information detected by the sensing unit and the signal output from the flow rate detecting unit 73.

In detail, the sensing unit may include a reference sensing unit 81, a first sensing unit 82 positioned above the reference sensing unit 81, and a first sensing unit 82 positioned above the first sensing unit 82. 2 sensing unit 83 is included. That is, in the present embodiment, the installation heights of the detection units 81, 82, and 83 are different from each other.

Each sensing unit 81, 82, 83 may be, for example, an electrode sensor. The reference detector 81 is grounded. The first detector 82 and the second detector 83 may be connected to the controller 70.

The specific amount of washing water between the first detector 82 and the second detector 83 is stored in the memory 71. In detail, the amount of washing water Aml to the first sensing unit 82 and the amount of washing water Bml to the second sensing unit 83 are stored, and accordingly, the specific amount of washing water BA ml is stored. Is determined.

In this embodiment, for example, the specific washing water amount may vary according to the height difference between the first sensing unit 82 and the second sensing unit 83, and in this embodiment, the specific washing water amount is 150 ml. An example is demonstrated.

On the other hand, the dishwasher according to the present embodiment is performed a plurality of strokes until the washing of the dishes. At least one of the entire strokes is supplied with water to the dishwasher from the outside. Generally, at least two water supplies are carried out in a stroke.

The water supply amount required for each of two or more strokes in which the water supply is performed may be different, and the water supply amount information required for each stroke is stored in the memory unit 71. The water supply amount information stored in the memory unit 71 is, for example, pulse number information.

For example, when 4 liters of washing water is required in one stroke, m pulse number information is stored in the memory unit 71, and the controller 40 controls the number of pulses output from the flow meter and the memory. The number of pulses stored in the unit 71 is compared to determine whether the water supply is completed.

In other words, since the flow rate per one pulse is determined, the required number of washing water is supplied using the number of pulses. Therefore, in the present embodiment, the flow rate per unit pulse is a criterion for determining the flow rate.

3 is a graph illustrating a signal change of a first sensing unit and a second sensing unit over time according to a first embodiment, and FIG. 4 is a flowchart illustrating a control method of the dish washing machine according to the first embodiment.

1 to 4, washing conditions of the dish washing machine are selected by manipulation of the control panel 3. Then, the controller 70 causes the dishwasher to operate according to the selected condition.

In general, the entire stroke of the dishwasher may consist of a washing stroke, a rinse stroke, a drying stroke, and the like. In this embodiment, it is noted that the stroke constituting the entire stroke of the dishwasher is not limited.

The washing stroke or the rinsing stroke may be repeated a plurality of times, and the washing stroke or the rinsing stroke includes a water supply stroke and a drainage stroke, respectively.

When a specific stroke constituting the stroke of the dish washing machine starts, water supply starts (S1). The controller 70 allows the water supply valve 40 to be opened for water supply. Then, the washing water flows from the water supply source to the sump 10.

While water supply is being performed, the flow rate detection unit 73 continuously outputs a pulse signal to the control unit 70 as shown in FIG. 3 (S2). The output pulse number is integrated in the controller 70.

In addition, the controller 70 detects currents of the first detector 82 and the second detector 83.

When the wash water is supplied to the sump 10, the water level of the sump 10 is increased, and when the wash water is supplied to the position of the first detection unit 82 of the sump 10, the wash water is supplied to the sump 10. The first detector 82 and the reference detector 81 are energized to decrease the current value of the first detector 82 (see 82 in FIG. 3).

Then, the controller 70 determines that the signal of the first detector 82 has changed (S3).

Then, when the water is continuously supplied to the position of the second detection unit 83 of the sump 10 while the water is being supplied, the second detection unit 83 and the reference detection unit 81 by the washing water. Is energized to decrease the current value of the second sensing unit 83 (see 83 in FIG. 31). Then, the controller 70 determines that the signal of the second detector 83 has changed (S4).

Next, the controller 70 determines the number of pulses output from the signal change time point of the first detector 82 to the signal change time point of the second detector 83.

For example, FIG. 3 shows that 10 pulses are output.

In the present exemplary embodiment, the controller 70 determines the number of pulses output from the signal change point of the first detector 82 to the signal change point of the second detector 83. 73 is located upstream of the sensing unit relative to the flow direction of the wash water.

Then, a new flow rate determination criterion is calculated using the amount of washing water (eg, 150 ml) and the number of pulses between the first and second sensing units 82 and 83 (S5).

In detail, when 10 ml of washing water is supplied, 10 pulses are output, so the unit flow rate per unit pulse is calculated as 10 ml. The calculated unit flow rate (10 ml) per unit pulse is stored in the memory unit 71 on the basis of the new flow rate determination standard (S6).

When the new flow rate determination criteria stored in the memory unit 71 are the same as the previous flow rate determination criteria, it means that the flow rate determination criteria are substantially maintained, and when the new flow rate determination criteria is different from the previous flow rate determination criteria, This means that the flow rate criterion is corrected.

Then, the controller 70 adjusts the operation of the water supply valve 40 based on the stored flow rate determination criteria. Then, the water is finally supplied exactly as the amount of washing water required in a specific stroke (S7).

Hereinafter, the technical significance of newly calculating the flow rate determination criterion using the specific amount detected by the sensing unit and the pulse signal output from the flow rate sensing unit will be described.

As described above, the memory unit 71 stores water supply amount required for a specific stroke and pulse number information corresponding thereto. For example, the number of pulses with respect to 4 liters of washing water corresponds to m, and the unit flow rate (flow rate determination standard) per unit pulse is set to 4 liters / m.

Therefore, in a specific stroke, in order to supply 4 liters of washing water, the control part 70 closes the water supply valve 40 in the state which received m pulses. However, as described above, the unit flow rate per unit pulse varies according to the flow rate or pressure of the washing water.

In the course of the water supply, the water supply valve 40 was closed by receiving m pulses, but the amount of actually washed water may be less or more than 4 liters.

Therefore, in the present embodiment, a new flow rate determination criterion is calculated using the amount of washing water and the number of pulses between the first sensing unit 82 and the second sensing unit 83, and the rest is based on the new flow rate determination criteria. Allow watering to be performed.

That is, the number of pulses previously stored in the memory unit 71 may be m, but the number of pulses calculated based on the new flow rate determination criterion may be m ± α.

In addition, the controller 70 closes the water supply valve 40 in a state of receiving m ± α pulses, and thus, the correct amount of washing water may be supplied.

The new flow rate criterion calculation may be performed at every stroke where water is supplied.

According to the present embodiment as described above, the flow rate per unit pulse (flow rate determination criteria) is newly calculated using the number of pulses output from the flow rate detection unit and the washing water of a specific amount (absolute amount) detected by the detection unit, and the calculated flow rate determination Since water supply is performed based on the criteria, it is possible to supply water as accurately as the amount of water required for a specific stroke.

In addition, since the flow rate determination criterion is newly calculated for every stroke in which water is supplied, it is possible to prevent the actual amount of water from being changed by the detection error of the flow rate sensing unit for each stroke.

5 is a cross-sectional view of the dishwasher according to the second embodiment.

The present embodiment is the same as the first embodiment in other parts, except that there is a difference in the position of the sensing unit. Therefore, hereinafter, only characteristic parts of the present embodiment will be described, and the same parts as the first embodiment will be used herein.

1 and 5, the air brake 60 is provided with a sensing unit for detecting a specific amount of washing water.

In detail, the reference detector 81, the first detector 82, and the second detector 83 are installed on the first flow path 33 of the air brake 60. The arrangement of the sensing units 81, 82, and 83 is the same as in the first embodiment.

In the present embodiment, each of the sensing units 81, 82, and 83 is positioned on the first flow path 33 through which the washing water flowing through the flow sensing unit 73 flows.

Therefore, in combination with the first embodiment and the present embodiment, the sensing unit may be disposed on a series of water supply passages connecting the external water supply source and the sump, and the flow rate detection unit may be configured based on the flow direction. It is arranged on the upstream side of the sensing unit.

1 is a cross-sectional view of the dishwasher according to the first embodiment.

2 is a block diagram for explaining the configuration of the dish washing machine according to the first embodiment.

3 is a graph illustrating signal changes of a first detector and a second detector over time according to a first embodiment;

4 is a flowchart illustrating a control method of the dish washing machine according to the first embodiment.

5 is a cross-sectional view of the dishwasher according to the second embodiment.

Claims (9)

A first detector and a second detector disposed at different positions and configured to detect a specific amount of washing water between the two; A signal output unit which outputs a signal according to the flow of the washing water while the amount of the washing water is detected by the first and second sensing units; And And a controller configured to determine a flow rate per unit signal by using the specific washing water amount and the signal output from the signal output unit. The method of claim 1, The control unit is a dishwasher for controlling the water supply valve so that the washing water is supplied by the amount of washing water required in a specific stroke, based on the determined flow rate per unit signal. The method of claim 1, The dish washer of the first sensing unit and the second sensing unit are different in installation height. The method of claim 3, wherein A reference detector installed at a lower position than the first detector and the second detector; Each sensing unit is an electrode sensor, And the reference sensing unit is grounded. The method of claim 3, wherein The signal output unit is a dish washer located on the upstream side of each sensing unit based on the flow direction of the washing water. The method of claim 1, At least one washing nozzle for spraying the washing water into the dishware, A sump for supplying washing water to the one or more washing nozzles, Each sensing unit is provided in the sump. The method of claim 1, At least one washing nozzle for spraying the washing water into the dishware, A sump for supplying washing water to the at least one washing nozzle, A water supply passage connecting the sump and an external water supply source is included. Each sensing unit is located in the water supply passage. A washing tank in which dishes are accommodated; At least one washing nozzle provided in the washing tank to spray washing water into the dishware; Sump for supplying wash water to the at least one wash nozzle; A water supply passage for supplying the washing water to the sump from an external water supply source; A sensing unit for sensing a specific amount of the washing water supplied from the water supply source; A flow rate sensing unit provided on an upstream side of the sensing unit to output a signal according to the flow of the washing water while the specific amount of the washing water is detected; And The control unit calculates the flow rate determination criteria using the specific amount of wash water detected by the detection unit and the signal output from the flow rate detection unit, and the control unit to supply the amount of wash water required by a specific stroke by using the calculated flow rate determination criteria Dishwasher included. The method of claim 8, The sensing unit includes a reference detecting unit, A first detector disposed at a position higher than the reference detector; A second sensing unit disposed at a position higher than the first sensing unit, The specific washing water amount is the amount of washing water between the first sensing unit and the second sensing unit.

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