KR20040096144A - washing machine having emergency drying function and control method the same - Google Patents

Abstract

PURPOSE: A washing machine having an emergency drying function and a control method thereof are provided to complete a drying operation by supplying power through a separate route if the drying operation stops by an abnormal-off of a thermostat. CONSTITUTION: A washing machine having an emergency drying function is composed of a heater(12) for heating the air circulating through the inside of the washing machine; a heater overheating-prevention unit for supplying power of a first route to the heater and cutting off the power of the first route if the heater is overheated over a preset temperature; a temperature detecting unit for detecting the inside temperature of the washing machine; a switching unit for supplying power of a second route to the heater; and a control unit(21) for controlling the switching unit according to a detection value of the temperature detecting unit as the heater overheating-prevention unit is turned off.

Description

Washing machine having emergency drying function and control method the same}

The present invention relates to a washing machine, and more particularly, to a washing machine having an emergency dry driving function and a control method thereof.

In general, a washing machine may be classified into a washing method in which laundry is put in an upper side and a washing machine is rotated in a pearl shaper, that is, a rotary blade and a washing tank, and a washing method is performed by putting laundry in a front side and rotating a drum.

Nowadays, the awareness of the drum-type washing machine, which consumes less water and damages the laundry, is increasing and its usage is increasing. Also, to increase the user's convenience, a dry washing machine is available that can be washed and dried. .

1, the general drying drum washing machine rotates by the main body 1, the tub 2, and a drum motor (not shown) to drain the drum 3 and wash water to perform washing and drying. Pump (4), fan motor (5) for circulating air for drying laundry in drum (3), heater (11) for heating air circulated by fan motor (5), dry duct (Duct) And a water supply valve 7 for supplying water such that air containing water passes through the drum 3 to condense, and a thermistor 8 for detecting a temperature in the dry duct.

At this time, the drying related circuit configuration of the combined drying drum washing machine of Figure 1 with reference to Figure 2 as follows.

The fan motor 5, the heater 11, the thermostat 12, the thermistor 8 and the relay 13 are connected in series at the power supply stage, and the control unit 21 is connected to the dry duct through the thermistor 8. It is configured to detect the temperature to control the relay 13.

In this case, the heater 11 is 'off' when the heater 11 is overheated above a predetermined temperature, and the thermostat 12 for disconnecting power to the heater 11 is connected in series.

Briefly explaining the administrative process of the dry-use drum washing machine configured as described above are as follows.

First, the user puts laundry into the drum 3 and starts washing by pressing a predetermined operation key.

Subsequently, the controller 21 of the washing machine detects the quantity of laundry and performs water supply accordingly, and then drives the drum motor to perform washing.

And rinsing is performed by repeating water supply and drainage.

Subsequently, the drum motor is driven at a set speed for a time set manually by the user or automatically set according to the amount of washing cloth, and the pump 4 is driven to perform dehydration.

When dehydration is completed, the fan motor 5, the heater 11, the water supply valve 7, the pump 4, and the drum motor are driven to perform drying (S24).

At this time, the drying process in more detail, first, as the drum (3) is rotated by the drum motor at the same time as the fan motor (5) and the heater (11) operates, high-temperature dry air inside the drum (3) It passes through the laundry, absorbs the moisture of the laundry, and circulates back to the fan motor 5 side.

On the other hand, the microcomputer proceeds with reference to the measured value of the thermistor 8.

Subsequently, when it is determined that the drying is completed, the microcomputer stops the operation of various loads such as the fan motor 5, the heater 11, the drum motor, the water supply valve 7, and the pump 4 and ends the drying.

At this time, if a power failure occurs while the drying is in progress or the power cord is inadvertently unplugged by the user, the drying fan motor 5 stops operation and the thermostat 12 is stopped due to the heat generated from the heater 11. The case where 'off' occurs.

Therefore, even when the power cord is plugged in again or the power is supplied in the power failure state and the drying operation is performed, since the thermostat 12 is in an 'off' state, power is not applied to the heater 11 and thus drying is not performed.

At this time, the thermostat 12 is provided with a reset button 12-1 for switching the thermostat 12 back to the 'on' state, as shown in FIG. You should find this and press the reset button 12-1.

Therefore, there is a problem inconvenient to the user because the service man has to wait for the dry operation not to wait until the serviceman comes to press the reset button 12-1 of the thermostat (12).

Accordingly, the present invention has been made to solve the above-described problems, and provides a washing machine having an emergency drying operation function and a control method thereof to solve the user's inconvenience by performing emergency drying operation at the time of abnormal thermostat off. Has its purpose.

1 is a cross-sectional view showing the configuration of a general dry drum washing machine

Figure 2 is a circuit diagram showing a drying related configuration of a washing machine according to the prior art

3 is a perspective view showing the structure of the thermostat of FIG.

Figure 4 is a circuit diagram showing a drying related configuration of the washing machine having an emergency operation function according to the present invention

5 is a flowchart illustrating a control method of a washing machine having an emergency driving function according to the present invention.

-Explanation of symbols for the main parts of the drawing-

5: fan motor

8: Thermistor 11: Thermostat

12: heater 13: first relay

21: control unit 22: second relay

Washing machine having an emergency drying operation function according to the present invention is a heater for heating the air circulated inside the washing machine, and supply the power of the first path to the heater and the power supply of the first path when the heater is overheated over a predetermined temperature Heater overheating prevention means for shutting off the lamp, temperature detecting means for detecting the temperature inside the washing machine, switching means for supplying power of the second path to the heater, and detection values of the temperature detection means when the heater overheating prevention means is turned off. And a control unit for controlling the switching means.

The control method of the washing machine having an emergency drying operation function according to the present invention comprises the steps of determining whether the heater overheat prevention means is off, and if the heater overheat prevention means is turned off by detecting the temperature detection value of the temperature detection means whether the abnormal thermostat off And determining, and if the thermostat is abnormally off, controlling the switching means to supply power to the heater and perform a drying operation.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of a washing machine having an emergency drying operation function and a control method according to the present invention in detail.

4 is a circuit diagram illustrating a drying related configuration of a washing machine having an emergency driving function according to the present invention, and FIG. 5 is a flowchart illustrating a control method of the washing machine having an emergency driving function according to the present invention.

Drying-related configuration of the washing machine having an emergency operation function according to the present invention, as shown in Figure 4, the fan motor 5, the heater 11, the thermostat 12, thermistor 8, the first to the power stage The relay 13 is connected in series, and the second relay 22 is connected in parallel at both ends of the thermostat 12, and the control unit 21 detects the temperature in the dry duct through the thermistor 8 so that the relay ( 13) and determines the abnormal 'off' of the thermostat 12 according to the temperature detection value of the thermistor 8 when the thermostat 12 is turned off, and if the abnormal thermostat 12 is turned off, the second relay 22 It is configured to supply power to the heater 11 by turning on.

The control method of the washing machine having the emergency driving function according to the present invention configured as described above will be described with reference to FIGS. 5 and 4.

First, the control unit 21 reads the temperature inside the dry duct of the washing machine through the thermistor 8 from time to time.

Subsequently, it is determined whether the thermostat 12 is 'off' (S51).

At this time, when a power failure occurs or the power cord is unplugged during the drying operation, the thermostat 12 is 'off' because the fan motor 5 does not operate and the heat generated by the heater 11 is not cooled accordingly.

Therefore, when the thermostat 12 is 'off', the controller 21 reads the thermistor 8 temperature detection value at that time (S52), and if the thermostat 12 is abnormally turned off according to the temperature detection value, In the state in which power is normally supplied, the heater 11 is not overheated, and the heater 11 is overheated due to the interruption of the power supply to determine whether the thermostat 12 is 'off' (S53).

Subsequently, when the thermostat 12 is abnormally 'off', the determination result S53 turns on the second relay 22 to supply power to the heater 11 (S54).

At this time, the thermostat 12 is abnormally turned off to display a message indicating that the drying administration is an emergency measure.

Then proceed with the remaining drying stroke (S55), and determines whether the drying stroke is completed (S56), and ends when the drying stroke is completed.

On the other hand, if the determination result (S51), the thermostat 12 is not 'off' proceeds to the normal drying operation (S55), and determines whether the drying administration is completed (S56), and ends when the drying administration is completed.

On the other hand, if the thermostat 12 is normally 'off', the determination result (S53) displays an error message and ends.

Washing machine having an emergency drying operation function and the control method according to the present invention to eliminate the inconvenience of the user because the remaining drying operation is performed by supplying a separate path power when the drying stop due to abnormal thermostat 'off' There is.

Claims (4)

A heater for heating air circulated inside the washing machine; Heater overheat prevention means for supplying power of the first path to the heater and cutting off the power supply of the first path when the heater is overheated above a predetermined temperature; Temperature detecting means for detecting a temperature inside the washing machine; Switching means for supplying power of a second path to the heater; And a control unit for controlling the switching means according to the detected value of the temperature detecting means when the heater overheat prevention means is turned off. According to claim 1, The switching means is a washing machine having an emergency operation function, characterized in that connected to both ends of the heater overheat prevention means. A heater overheat prevention means for supplying power of a first path to the heater and blocking the power supply of the first path when the heater is overheated above a preset temperature, a temperature detecting means for detecting a temperature inside the washing machine, and a second A washing machine having switching means for supplying power of a path to the heater, Determining whether the heater overheat prevention means is turned off; Determining whether an abnormal thermostat is turned off by sensing a temperature detection value of a temperature detection means when the heater overheat prevention means is turned off; And controlling the switching means to supply power to a heater and perform a drying operation when the thermostat is abnormally turned off. The method of claim 3, wherein The step of determining whether or not the abnormal thermostat off is an emergency operation function characterized in that the step of determining the abnormal thermostat off when the temperature detection value of the temperature detection means at the time when the heater overheat prevention means is off less than the thermostat off set value Control method of the washing machine having a.