KR100290230B1 - Method for controlling over pressure of drum type washing machine - Google Patents

Abstract

PURPOSE: An over pressure control method for a drum type washing machine is provided to properly resolve the pressure increase due to the water of a high temperature and a bleaching agent for preventing the water leakage and explosion due to the over pressure in advance, thereby increasing the reliability of the washing machine. CONSTITUTION: An over pressure control method for a drum type washing machine includes the steps of determining whether a previous stroke is a water supply stroke if an internal pressure of the washing machine is higher than a preset reference pressure(S21,S22), reducing the internal pressure by stopping the washing stroke if yes(S23), determining whether a heater is turned on if the previous stroke is not the water supply stroke(S27), and resolving the over pressure in the washing machine if yes(S28-S31).

Description

Overpressure control method of drum washing machine

The present invention relates to a washing machine, and more particularly to a method for controlling overpressure of a drum washing machine.

Generally, a washing machine is a machine for washing laundry by performing washing, rinsing, and dehydrating strokes according to a predetermined algorithm. The washing machine is classified into a pulsator type, a stirring type, a drum type, and the like according to a washing method.

At this time, as shown in FIG. 1, the drum washing machine includes a main body 1, a tub 2 fixed by a damper (not shown) inside the main body 1, and laundry into the tub 2 and a motor. Receiving the driving force of the (10) through the belt (11) to rotate the drum related to the washing process 3, the thermistor (4) for measuring the temperature of the washing water supplied to the drum (3), the detergent Detergent container (5), the water supply pipe (6) for supplying the washing water or the washing water mixed with the detergent of the detergent container (5) is connected to the detergent container (5), drain pipe for discharging the washing water used in the washing stroke to the outside ( 7) is connected to the end of the drain pipe 7 is configured to include a pump (8) and a drain hose (9) for forcibly pumping the washing water.

And when looking at the operation of the drum washing machine configured as described above, first, the user opens the door (not shown) attached to the front of the main body 1, puts the laundry, and enters the washing command through the control panel, the washing water is the detergent container ( It is filled in the drum 7 by the guidance of the water supply pipe 6 through 5). Subsequently, when the washing water is filled above a certain level, the motor 10 is driven and the drum 3 rotates to perform washing.

In this case, when the user selects the washing to be boiled, the washing water is heated up to 97 ° C. using an internal heater and the washing is performed using the heated washing water heated as described above.

When the washing is completed, the pump 8 is operated so that the washing water is drained to the outside via the drain pipe 7 and the drain hose 9, and when the draining is completed, the rinsing and dehydration stroke is continuously performed to terminate the washing administration. .

Drum washing machine according to the prior art has the following problems.

First, when a user inputs a washing instruction requiring high temperature washing water such as boil- ing washing, the washing water is heated using an internal heater.

At this time, if the user injects hydrogen peroxide-based bleach during washing, the pressure inside the closed washing tank will be increased by a certain level due to the bleach due to the water temperature.In severe cases, the washing machine will not be able to overcome the pressure and explode. Can be.

Second, if washing water is rotated rapidly during washing administration using high temperature washing water, the internal pressure increases rapidly due to the flow of washing water and the overpressure is discharged through the detergent water supply port. In this process, noise is generated and severe overpressure is generated. In this case, internal washing water is discharged.

Accordingly, an object of the present invention is to provide an overpressure control method for a drum washing machine, which is designed to solve the above-mentioned problems in general and to solve the overpressure inside the drum washing machine.

1 is a cross-sectional view showing the structure of a general drum washing machine.

2 is a cross-sectional view showing the structure of a drum washing machine according to the present invention.

3 is a flowchart illustrating a method for controlling an overpressure of a drum washing machine according to the present invention.

* Explanation of symbols for main parts of the drawings

1: body 2: tub

3: drum 4: thermistor

5: detergent container 6: water pipe

7: drain pipe 8: pump

9: drain hose 10: motor

11: belt

The present invention provides a method for controlling an overpressure of a drum washing machine, the method comprising: measuring an internal pressure of a drum washing machine and comparing the pressure with a reference pressure to determine whether an overpressure has occurred, and determining a cause of the overpressure according to the determination result; And depressurizing the inside of the drum washing machine according to the determination result.

Hereinafter, the overpressure control method of the drum washing machine according to the present invention will be described with reference to the accompanying drawings.

2 is a cross-sectional view showing the structure of a drum washing machine according to the present invention, and FIG. 3 is a flowchart showing the overpressure control method of the drum washing machine according to the present invention.

As shown in Figure 2, the drum washing machine according to the present invention is the same as the drum washing machine according to the prior art except that the pressure sensor 12 is installed on one side of the water supply pipe (6).

Looking at the overpressure control method of the drum washing machine configured as described above are as follows. First, it is determined whether the internal pressure of the drum washing machine measured by the pressure sensor 12 is greater than or equal to a predetermined reference pressure (S21).

Subsequently, when the internal pressure of the drum washing machine is lower than the preset reference pressure, the determination result (S21) is determined to be normal, and the washing process currently in progress is continued.

On the other hand, the determination result (S21), if the internal pressure of the drum washing machine is more than the predetermined reference pressure determines whether the previous stroke of the current ongoing stroke is water supply administration (S22).

At this time, if the previous stroke is a water supply stroke, the pressure inside the closed drum washing machine may increase due to the heat of the washing water, and thus it is determined whether the previous stroke is water supply.

Subsequently, the determination result (S22), if the previous stroke is the water supply stroke, the washing is stopped (S23), and a predetermined amount of cold water is supplied (S24), and the internal temperature is lowered.

Then, after a predetermined time, it is determined whether the internal pressure drops to a predetermined level or more (S25), and when the internal pressure drops, the washing administration resumes (S26).

On the other hand, if the determination result (S25), the internal pressure does not fall above a predetermined level, cold water is supplied again (S24), and the determination step (S25) is performed again.

Subsequently, the determination result (S22), it is determined whether the heater (not shown) is the "on" state if the previous stroke is not the water supply stroke (S27).

At this time, the drum washing machine is equipped with a heater therein to directly use the cold water when performing the washing washing. And the user can use the bleach in the rinsing stroke, each time the bleach is used, the residue is attached to the heater surface and the amount of the adhesion to the heater surface increases as the number of uses increases.

In addition, when the heater is operated in a 'ON' state with a certain amount of hydrogen peroxide-based bleach attached to the surface of the heater, the hydrogen peroxide-based bleach may be boiled by the high temperature of the wash water, thereby increasing the internal pressure. Therefore, it is determined whether the heater is 'ON' state.

When the heater is in the 'ON' state, the determination result (S27) determines that the pressure rise by the hydrogen peroxide-based bleach adhering to the heater surface stops the washing operation (S28), and sequentially performs drainage and water supply (S29, S30), washing is resumed (S31).

At this time, in order to relieve the overpressure inside the washing machine and at the same time to remove the hydrogen peroxide-based bleach component is to sequentially perform drainage and water supply.

On the other hand, the determination result (S27), if the heater is not in the 'ON' state is determined as a failure of the washing machine (S32), generates an alarm and displays an error message such as displaying the failure state through the display unit (S33).

The overpressure control method of the drum washing machine according to the present invention detects the pressure rise due to the high temperature wash water and the bleach, and solves it properly, thereby preventing safety accidents such as washing water leakage and explosion due to overpressure and improving the reliability of the washing machine. It works.

Claims (6)

An overpressure control method for a drum washing machine having a heater, the method comprising: determining whether a previous stroke is a water supply stroke when an internal pressure of the drum washing machine is equal to or greater than a preset reference pressure; Stopping the washing stroke and depressurizing the inside of the drum washing machine when it is determined that the previous stroke is water supply stroke; Determining whether the heater is on if the previous stroke is not a water supply stroke; And, if the heater is on, the over-pressure control method of the drum washing machine comprising the step of releasing the over-pressure inside the drum washing machine to determine the occurrence of over-pressure. The overpressure control method of claim 1, wherein if the previous stroke is a water supply stroke, the step of determining an overpressure is a step of determining an overpressure generated by supplying high temperature washing water. The overpressure control method of claim 1, wherein the determining of the overpressure when the heater is on is determined by the occurrence of the overpressure caused by the bleach component attached to the heater surface. The process of claim 1, wherein the depressurizing the inside of the drum washing machine comprises: stopping the current stroke, determining whether the pressure drops by supplying a predetermined amount of cold water, and when the pressure is lowered, the stroke that is currently in progress. Overpressure control method of the drum washing machine, characterized in that the step consisting of restarting. The overpressure control of the drum washing machine according to claim 1, wherein the overpressure inside the drum washing machine is performed by stopping the current stroke and restarting the washing by sequentially performing drainage and water supply. Way. The method of claim 1, further comprising: determining whether the heater is in the 'on' state and outputting an error message by determining that the heater is not in the 'on' state as a failure of the drum washing machine. Overpressure control method of drum washing machine.

Images