KR101257506B1 - A dish washer and method of controlling the same - Google Patents

Abstract

Dishwasher according to an embodiment of the present invention, the quantity detection unit for measuring the amount of washing water introduced into; A microcomputer that reads the amount of the washing water measured by the quantity detecting unit and stops or further supplies the washing water therefrom; And a water supply valve whose operation is controlled by the microcomputer, wherein the quantity detecting unit detects a change in pressure due to a hall sensor reading the rotation speed of the flow meter rotated by the supplied washing water, and the supplied washing water. It consists of a pressure sensor for sensing, the microcomputer is characterized in that for determining whether to change the set frequency in accordance with the pressure measured by the pressure sensor.

By the dishwasher as proposed, it is possible to accurately measure the amount of washing water introduced into the dishwasher, and thus has the advantage of more precisely controlling the amount of washing water supplied into the dishwasher.

In addition, by changing the set frequency of the Hall sensor for controlling the amount of washing water flowing in, it is possible to more accurately control the amount of washing water even if the water pressure of the washing water is different depending on the environment of the dishwasher is used. have.

Dishwasher, Quantity Detector, Hall Sensor, Pressure Sensor

Description

A dish washer and method of controlling the same}

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

Figure 2 is a block diagram illustrating a dishwasher according to an embodiment of the present invention.

Figure 3 is a schematic view showing a method for measuring the washing water inflow amount according to an embodiment of the present invention.

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

5 is a flowchart illustrating a control method of the dish washing machine according to the second embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

100: air brake 200: quantity detection unit

300: microcomputer 400: memory unit

500 drive unit

The present invention relates to a dishwasher, and more particularly, to a dishwasher and a method of controlling the same, which can prevent a variation in water supply amount according to a use environment of the dishwasher.

In general, the dishwasher is a convenient kitchen appliance that automatically removes food debris such as rice paste attached to the tableware by spraying high-pressure washing water and then removes it.

In detail, the dishwasher includes a tub in which a washing tank is formed and a sump mounted on the bottom of the tub to store washing water. In addition, a detergent inlet for introducing a predetermined amount of detergent into the inner surface of the door is formed, and a predetermined amount of detergent is supplied into the detergent inlet.

Further, the washing water is moved to the spray nozzle by the pumping action of the washing pump mounted inside the sump, and the washing water moved to the spray nozzle is sprayed at high pressure through the spray hole formed at the end of the spray nozzle.

In addition, the washing water sprayed at the high pressure hits the surface of the tableware, and dirt, such as food residues on the tableware, falls to the bottom of the tub.

On the other hand, in the conventional dishwasher, the washing water supplied to the sump moves through a predetermined air brake, and the predetermined flowmeter mounted in the air brake rotates as the washing water is supplied.

In addition, the predetermined microcomputer may estimate the amount of washing water introduced into the dishwasher by sensing the rotation speed of the flow meter.

However, in the conventional dishwasher, since the amount of washing water is controlled only by the rotational speed of the flowmeter, when the water pressure of the incoming washing water is different due to the difference in the environment in which the dishwasher is used, the rotational speed of the flowmeter is the same. Nevertheless, there is a problem in that the amount of water actually introduced is different.

Accordingly, since the amount of washing water to be introduced for washing the dishes is not accurately controlled, there is a problem that the trust in the dishwasher is lowered.

The present invention is proposed to solve the above problems, it is possible to accurately measure the amount of washing water flowing into the dishwasher, accordingly the tableware that can more precisely control the amount of washing water supplied into the dishwasher An object of the present invention is to propose a washing machine and a control method thereof.

In addition, by changing the set frequency of the Hall sensor for controlling the amount of incoming washing water, the dishwasher can more accurately control the amount of washing water even if the water pressure of the washing water is different depending on the environment of the region where the dishwasher is used. And a control method thereof.

Dishwasher according to an embodiment of the present invention for achieving the above object, the quantity detection unit for measuring the amount of washing water introduced into; A microcomputer that reads the amount of the washing water measured by the quantity detecting unit and stops or further supplies the washing water therefrom; And a water supply valve whose operation is controlled by the microcomputer, wherein the quantity detecting unit detects a change in pressure due to a hall sensor reading the rotation speed of the flow meter rotated by the supplied washing water, and the supplied washing water. It consists of a pressure sensor for sensing, the microcomputer is characterized in that for determining whether to change the set frequency in accordance with the pressure measured by the pressure sensor.

In the control method of the dishwasher according to another aspect of the present invention, the amount of washing water flowing into the dishwasher is measured at a predetermined frequency by the hall sensor, and the pressure changed as the washing water is introduced is measured by the pressure sensor. step; Determining whether the frequency measured by the hall sensor reaches a first preset frequency; Storing the pressure measured by the pressure sensor when the frequency measured by the hall sensor reaches a first set frequency; And calculating a difference value between the pressure measured by the pressure sensor and the reference pressure stored in the memory unit, wherein the first preset frequency is differently set depending on whether the difference value is within a set value range. It features.

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By the dishwasher and its control method as proposed, it is possible to accurately measure the amount of washing water flowing into the dishwasher, and thus the advantage of more precisely controlling the amount of washing water supplied into the dishwasher have.

In addition, by changing the set frequency of the Hall sensor for controlling the amount of washing water flowing in, it is possible to more accurately control the amount of washing water even if the water pressure of the washing water is different depending on the environment of the dishwasher is used. have.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail. However, one of ordinary skill in the art who understands the spirit of the present invention can easily suggest another embodiment by adding, changing, deleting or adding components within the scope of the same spirit, but this also falls within the scope of the spirit of the present invention. something to do.

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

Referring to Figure 1, the air brake 100 according to an embodiment of the present invention is attached to the outer surface of the tub, and performs the function of delivering the wash water to the sump mounted on the bottom of the tub.

In detail, the air brake 100 has an air inlet 130 opening at a predetermined size at an upper corner to allow indoor air to be sucked, and a water supply formed at one side of the bottom to supply raw water for dish washing. The hose connector 110 and the water supply passage 113 which is a path through which the washing water introduced from the water hose hose 110 moves.

The other side of the water supply hose connector 110 is connected to a water supply hose, and the water supply hose is connected to a water supply valve for supplying external raw water into the dishwasher.

In addition, the flow meter 111 formed at the end of the water supply passage 113, rotated by the wash water to detect the flow rate and formed in the substantially central portion of the air brake 100 penetrates the side of the tub inside the washing tank And a cleaning tank air inlet 140 for communicating with the air inlet 130.

The flow rate of the flow meter 111 is detected by a microcomputer, which will be described later, and the microcomputer accurately measures the amount of washing water by using the speed of the flow meter 111 and the pressure measured by a pressure sensor (to be described later). Can be controlled.

The water supply flow passage 113 is formed vertically from the bottom to the top, has an approximately n-shape so as to be bent at a predetermined height and continue to the bottom, and the flow meter 111 is positioned at the end side of the flow passage.

In addition, by forming the washing water inlet 114 of the flow meter 111 to face upward, the impeller (to be described later) formed in the flow meter 111 is rotated by the free fall force of the washing water.

In addition, in order to prevent the noise generated in the washing tank from propagating through the air inlet 130 to the outside, it is extended to a predetermined length from the upper surface of the air brake 100 and is formed to be inclined at a predetermined angle. The first air guide wall 131 is included. In addition, the contacting surface of the washing tank air inlet 140 is formed to be inclined at a predetermined angle so that the air suction passage from the air inlet 130 to the washing tank air inlet 140 forms an S shape. Two air guide wall 132 is included.

Meanwhile, the air brake 100 has a washing water outlet 115 through which the washing water rotated by the impeller in the flow meter 111 while passing through the washing water inlet 114 is formed, and passes through the washing water outlet 115. A sump feed connector 112 is included which is an inlet for one wash water to flow into the sump.

In addition, the floater 120 is located on the top of the sump water supply connector 112 and the upper portion of the plotter 120 in order to detect the level of water rising while the washing water is supplied into the sump through the sump water supply connector 112. Is formed in the plotter lever 121 to rise or fall together as the plotter 120 is raised or lowered, and a micro switch 170 formed on the upper side of the plotter lever 121 to detect the full water level. .

In addition, the sump drain connector 161 formed on the bottom surface of the air brake 100 and pumped by the drain pump (not shown), and the wash water introduced into the sump drain connector 161. The drain passage 163 is moved, and a drain hose connector 162 formed at an end of the drain passage and connected to the drain hose.

In addition, a siphon prevention check valve 152 mounted on an upper portion of the drain passage 163 to prevent the siphon phenomenon in which the washing water is continuously discharged through the drain passage 163 even after the drainage is stopped. More included.

In addition, the backwash prevention check valve 160 is further included to prevent the washing water moving along the drain flow passage 163 through the sump drain connector 161 to flow back to the drain pump by stopping the drain.

2 is a block diagram illustrating a dish washer according to an embodiment of the present invention, Figure 3 is a block diagram showing a method of measuring the washing water inflow amount according to an embodiment of the present invention.

2 and 3, the dishwasher according to the embodiment of the present invention includes a water supply valve 510 for allowing external raw water to flow into the dishwasher, and a driving unit 500 for operating the water supply valve 510. And a quantity detector 200 capable of sensing the amount of washing water introduced into the dishwasher, and driving the driving unit 500 according to the amount of washing water measured or calculated by the quantity detector 200. The microcomputer 300 to control and the memory unit 400 that stores the value measured by the quantity sensor 200 is included.

In addition, the quantity detecting unit 200 is a Hall sensor 210 that can detect the rotational speed of the impeller rotated by the incoming washing water, and a pressure sensor 220 that can measure the air pressure changed by the incoming washing water It can be made of).

In detail, as shown in FIG. 3, the flow meter 111 includes an impeller 111a that rotates by washing water falling along a water supply flow path, and has a magnet attached to a rotating shaft of the impeller 111a. The magnet 111b is provided.

In addition, the hall sensor 210 for detecting a pulse generated by the rotation of the magnet 111b is connected to the microcomputer 300.

The microcomputer 300 controls the flow rate by calculating the number of output waveforms (hereinafter, referred to as a frequency) transmitted from the hall sensor 210. Therefore, the quantity detecting unit 200 capable of detecting the amount of the washing water flowing in may be implemented by the hall sensor 210.

In addition, the lower bottom of the dishwasher is equipped with a pressure sensor 220 that can detect the pressure change by the washing water supplied to the sump, the pressure sensor 220 detects the air pressure changed by the washing water supplied to the sump can do.

In this case, the pressure sensor 220 may be made of a piezoelectric element that generates a voltage when the pressure is received in a predetermined direction or may be made of an electric pressure sensor to change the output voltage according to the fluctuation range of air pressure.

In addition, the microcomputer 300 may read the pressure measured by the pressure sensor 220, and calculate the amount of the washing water supplied into the washing machine from the microcomputer 300.

The microcomputer 300 may determine whether the number of output waveforms sensed by the hall sensor 210, that is, the measured frequency is equal to a preset frequency, and the measured frequency does not reach the set frequency. In this case, the water supply valve 510 may be operated by the driving unit 500 to control the washing water to further flow into the dishwasher.

In addition, the microcomputer 300 may compare the pressure measured by the pressure sensor 220 with a preset pressure. When the measured pressure does not reach the set pressure, the microcomputer 300 operates the water supply valve 500. More washing water may be introduced into the dishwasher.

The set frequency and the set pressure may be stored in the memory unit 400, and the microcomputer 300 may set the set frequency and the set pressure according to the measured values of the hall sensor 210 and the pressure sensor 220. Can be changed.

To this end, the memory unit 400 may be formed of a nonvolatile memory device in which data may be preserved even when power is not applied.

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

First, when a washing course is input through a predetermined key input unit provided in the dishwasher, the water supply valve 510 is operated to supply the washing water into the dishwasher (S10).

In addition, while the washing water is supplied into the dishwasher, frequency measurement by the hall sensor 210 and pressure measurement by the pressure sensor 220 are performed.

Then, the microcomputer 300 determines whether the frequency measured by the hall sensor 210 has reached the set frequency (S11), and if the measured frequency does not reach the set frequency, the washing water is further supplied. .

Meanwhile, when the frequency measured by the hall sensor 210 reaches the set frequency, the microcomputer 300 determines whether the pressure measured by the pressure sensor 210 reaches the set pressure (S12). ).

When the pressure measured by the pressure sensor 210 does not reach the set pressure, the washing water is further supplied into the dishwasher. In addition, when the pressure measured by the pressure sensor 210 reaches the set pressure, the microcomputer 300 stops the operation of the water supply valve 510 to stop the supply of the washing water. (S13).

After the supply of the washing water is stopped, washing strokes such as washing the stored dishes by pumping the stored washing water at high pressure and spraying the washing water at high pressure through the spray nozzle are performed (S14).

5 is a flowchart illustrating a control method of the dish washing machine according to the second embodiment of the present invention.

First, when a washing course is input through a predetermined key input unit provided in the dishwasher, the water supply valve 510 is operated to supply the washing water into the dishwasher (S100).

In addition, while the washing water is supplied into the dishwasher, frequency measurement by the hall sensor 210 and pressure measurement by the pressure sensor 220 are performed.

In addition, the microcomputer 300 determines whether the frequency measured by the hall sensor 210 has reached the first set frequency (S110), and if the measured frequency does not reach the set frequency, the washing water is further supplied. To control.

On the other hand, when the frequency measured by the hall sensor 210 reaches a set frequency, the microcomputer 300 stores the pressure measured by the pressure sensor 210 in the memory unit 400 (S120). ).

Next, the microcomputer 300 determines whether the absolute value of the difference between the measured pressure stored in the memory unit 400 and the pre-stored reference pressure is within a set value (S130).

When the absolute value of the difference between the pressure measured by the pressure sensor 220 and the reference pressure is within the set value, the operation of the water supply valve 510 is stopped, and thus the inflow of the washing water is stopped (S150).

However, when the absolute value of the difference between the measured pressure and the reference pressure exceeds a set value, the microcomputer 300 changes and stores the first set frequency to a second set frequency (S140).

In detail, when the absolute value of the difference between the measured pressure and the reference pressure exceeds a set value, the microcomputer 300 compares the measured pressure with the reference pressure to determine the second set frequency.

In other words, when the measured pressure is greater than the reference pressure, the second set frequency is set to a value smaller than the first set frequency, and when the measured pressure is smaller than the reference pressure, the second set frequency is set to the first pressure. It is set to a value greater than 1 setting frequency.

According to the embodiment of the present invention as described above, it is possible to measure the amount of the washing water supplied by the pressure sensor as well as the hall sensor, and thus has the effect of more accurately controlling the amount of the washing water supplied.

By the dishwasher and its control method as proposed, it is possible to accurately measure the amount of washing water flowing into the dishwasher, and thus the advantage of more precisely controlling the amount of washing water supplied into the dishwasher have.

In addition, by changing the set frequency of the Hall sensor for controlling the amount of incoming washing water, it is possible to more accurately control the amount of washing water even if the water pressure of the washing water is different depending on the environment of the dishwasher is used. There is this.

Claims (6)

Quantity detection unit for measuring the amount of washing water flowing into the interior; A microcomputer that reads the amount of the washing water measured by the quantity detecting unit and stops or further supplies the washing water therefrom; And A water supply valve whose operation is controlled by the microcomputer; The quantity detecting unit comprises a Hall sensor for reading the rotational speed of the flow meter rotated by the supplied washing water, and a pressure sensor for detecting a change in pressure by the supplied washing water, The microcomputer dishwasher, characterized in that for determining whether to change the set frequency in accordance with the pressure measured by the pressure sensor. The method of claim 1, And a memory unit for storing the frequency measured by the hall sensor and the pressure measured by the pressure sensor. The method of claim 2, The microcomputer, When the frequency measured by the hall sensor reaches the set frequency, And determining whether the set frequency is changed by determining whether an absolute value of the difference between the pressure measured by the pressure sensor and the reference pressure pre-stored in the memory unit is within a set value. delete Measuring the amount of washing water flowing into the dishwasher at a predetermined frequency by the hall sensor, and a pressure which is changed as the washing water is introduced by the pressure sensor; Determining whether the frequency measured by the hall sensor reaches a first preset frequency; Storing the pressure measured by the pressure sensor when the frequency measured by the hall sensor reaches a first set frequency; And Comprising a step of calculating the difference value between the pressure measured by the pressure sensor and the reference pressure stored in the memory unit, And the first set frequency is set differently according to whether the difference value is within a set value range. 6. The method of claim 5, The difference value between the pressure measured by the pressure sensor and the reference pressure stored in the memory unit is an absolute value of the difference, And when the absolute value is greater than the set value, the first set frequency is changed.

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