JPH0727028Y2 - Drum washing machine door opening and closing device and control method - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door opening / closing device for a drum washing machine, and in particular, detects the water level and internal temperature of the drum washing machine so that the door can be automatically opened only in a safe state. The present invention relates to a door safety device for a drum washing machine and a control method thereof.

[0002]

2. Description of the Related Art A conventional door opening / closing device for a drum washing machine is designed to open / close a door by using an electronic switch or a gear group.
If you have to open the door to add, reduce or organize laundry during use, the door cannot be opened without turning off the power, so always turn off the power and open the door. There is a hassle to open it.
In the case of the latter opening / closing device, if the door can be opened during use, it does not matter if there is no water in the drum, but if it is full, water will flow out. Or, when the drum is heated, there is a risk of being burned due to the outflow of heated water, and there is a problem that the surrounding environment is polluted.

A typical example of the prior art is US Pat.
No. 10,777. This patent stops the operation of the washing machine when it detects the non-operating position of the sensor switch or when it detects that the access door has not been hooked, the access door is hooked, and the sensor switch installed on the access door operates This is a control system for access doors that ensures that This patent guarantees that the washing machine operates when the door of the washing machine is hung, and when the washing water is filled in the drum washing machine or when the washing water is hot, the washing machine door Does not prevent you from opening.

[0004]

SUMMARY OF THE INVENTION The present invention has been devised to solve the above problems, and an object thereof is to provide an apparatus and method for opening a door of a washing machine in a safe state. Another object of the present invention is to provide a device and method for detecting the water level inside the washing machine and opening the door of the washing machine only when the washing machine has a certain amount of washing water or less. is there. Yet another object of the present invention is to provide an apparatus and method for detecting the temperature inside the washing machine and opening the door of the washing machine only when the temperature is below a certain temperature.

To achieve the above object, the water level inside the washing machine is sensed, and when the water level is below a certain value, the temperature inside the washing machine is sensed, and when the temperature is below a certain value, the door is opened. Send a signal to the hanging device to open the door of the washing machine. The device according to the present invention comprises door signal output means for outputting a door opening signal to the microcomputer according to a user's selection,
Water level sensing means for sensing and outputting the water level inside the washing machine drum, temperature sensing means for sensing and outputting the internal temperature of the washing machine drum, and processing by receiving signals from the water level sensing means and the temperature sensing means A microcomputer for outputting a door open signal when the water level and temperature in the drum are below a predetermined value by outputting an abnormality presence / absence signal, display means for receiving the signal from the microcomputer and displaying the state, and the microcomputer. And a door opening / closing drive means for receiving a signal to open the door. The method of controlling the device according to the present invention is as follows. After initialization and outputting and inputting a signal to each input / output port, storing data input to the input port, and delaying a signal input from the door opening input port in the input port for a predetermined time, If the door opening signal is not input, the process returns to the main program, and if the door opening signal is input, the process proceeds to the next step. And a step of determining a water level in the washing machine drum when a door opening signal is input in the step and the step, and in the step, when the water level is equal to or higher than a predetermined value, a drainage stroke is executed to determine an abnormal state. The step of displaying and repeating from the step of determining the water level in the washing machine drum; and in the step, if the water level is below a predetermined value, the drum internal temperature is above a predetermined value. Repeating from the step of judging whether there is a certain value and the step of judging whether the drum internal temperature is equal to or higher than a predetermined value by displaying an abnormal state after delaying for a predetermined time if the drum internal temperature is equal to or higher than a predetermined value. And a step of driving the door opening / closing part to display that there is no abnormality when the drum internal temperature is not higher than a predetermined level.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following is a detailed description of an embodiment of the present invention with reference to the drawings. FIG. 1 is a circuit diagram of a door opening / closing device of a drum washing machine according to the present invention. Microcomputer 1
Receives and processes a signal corresponding to the state of each unit and controls each unit. The door signal output unit 2 has an anode connected to the output port 02 of the microcomputer and a cathode connected to the switch S.
A diode D1 connected to one terminal of W1 and a switch SW whose other terminal is connected to a common contact of resistors R6 and R7
1, a terminal R1 connected to the input port I3 of the microcomputer, a resistor R6 having the other side commonly connected to the resistor R7 and the switch SW1, and a resistor R7 having a terminal other than the one connected to the common contact grounded. It

The water level sensing unit 3 has a first terminal connected to the power supply VCC2, a third terminal grounded, a second terminal connected to one terminal of the resistor R8, and a water level sensor connected to the input port I2 of the microcomputer 1. Terminals other than the terminal connected to the second terminal of the water level sensor are configured by a resistor R8 that is grounded.

The temperature sensing unit 4 includes a thermistor Th and a resistor R.
The input terminal of the thermistor Th is connected to the power supply VCC2, and the other side terminal is connected to the common terminal of the resistors R4 and R5. Further, the other terminal of the resistor R4 other than the terminal connected to the common contact is connected to the input port I1 of the microcomputer 1, and the other terminal of the resistor R5 is connected to the ground. The abnormality presence / absence display portion 5 includes a buffer IC 1 and a light emitting diode L.
It is composed of an ED and a resistor R9, which are connected in series in the order described above, and a buffer I which is one end of the series connection.
One terminal of C1 is connected to the output port 02 of the microcomputer 1, and one terminal of the resistor R9, which is the other end of the series connection, is connected to the output port 03 of the microcomputer 1.

The door opening / closing drive unit 6 includes a solenoid SOL, a triac TRIAC, a transistor TR1 and a resistor R.
1, R2 and R3, one terminal of the solenoid SOL is connected to the common AC power supply AC, and the other terminal is commonly connected to one terminal of the triac TRIAC and the power supply VCC1. The other side terminal of the triac TRIAC is connected to the other side of the common AC power supply AC to which the solenoid SOL is not connected, and the gate terminal of the triac TRIAC is a resistor R.
1 is connected to the collector terminal of the transistor TR1. The base terminal of the transistor TR1 is connected to the output port 01 of the microcomputer 1 through the resistor R3,
The emitter terminal is grounded. The resistor R2 is connected to the base terminal of the transistor TR1 and the common contact of the resistor R3, and the remaining terminals are grounded.

Reference numerals not described in the drawings are S for spring, D-HOOK for door hook, and D for door.
FIG. 2 is a flowchart showing the method according to the present invention. Hereinafter, the operation and effect of the present invention will be described with reference to the drawings. First, when power is applied to the drum washing machine, after initialization, the microcomputer 1 which is the control unit of the drum washing machine outputs and inputs respective signals from the respective input / output terminals and is programmed in advance. Although the control is performed in the state, the high signal "1" is output from the output terminals 02 and 03 (step 101), and at this time, the high signal "1" from the output terminal 02 is the light emitting diode of the abnormality presence / absence display portion 5. A high signal “1” from the output terminal 03, which is a drive signal for the LED 1 and the door signal input unit 2, is used as a drive control signal for the abnormality presence / absence display unit 5.

Next, in step 102, the water level, temperature, and door signal in the washing machine drum are received from the input terminals I1, I2, I3 of the microcomputer 1 at any time to be confirmed, and are stored in the microcomputer 1. In a RAM (not shown), a predetermined time for noise prevention is delayed in step 103 to maintain a standby state.
When the door switch SW of the door signal output unit 2 is turned on in the above-mentioned state, the high signal "1" is output from the output terminal 0 of the microcomputer 1 by the diode D1, the door switch SW.
And a resistor R to the door signal input terminal I3 of the microcomputer 1.

Therefore, in the microcomputer 1, it is judged whether there is a signal input from the door signal input terminal I3, and if there is no door signal, the process returns to the main routine,
If there is a door signal, the next step is performed (step 104) to detect the water level inside the washing machine drum, and at this time, the water level sensor LS operates according to the water level in the drum as shown in FIG. Then, a signal having a predetermined frequency is generated and input to the input terminal I2 of the microcomputer 1.
Therefore, the microcomputer 1 counts the frequency with respect to the input signal input through the input terminal I2, and inputs the frequency equal to or higher than the reference frequency (for example, 24,77 KHz) set in the programmed state in advance. If it is determined, the microcomputer 1 considers that there is water in the drum, and if a frequency below the reference frequency is input, it is determined that there is no water (step 105).

When it is determined that the drum is filled with water, the drainage process is performed (step 106), and the high signal "1" at the output terminal 0 of the microcomputer 1 is inverted and converted into the low signal "0". Output (step 107). Therefore, the high / low signal "1" from the output terminal 0 of the microcomputer 1 is displayed on the abnormality presence / absence display portion 5 as the buffer IC1 and the light emitting lamp LED1.
Since the current flows through the resistor R9, the issuing lamp LED1 is turned on, indicating that water is draining due to water in the drum, and step 10 is performed until the drainage stroke ends.
5, 106 and 107 are repeatedly performed.

On the other hand, if the water level detection unit 3 inputs a frequency below an arbitrary reference frequency, the microcomputer 1 considers that there is no water in the drum, and detects the temperature in the drum, which is the next step. However, in the temperature detecting process, the temperature inside the drum is detected by the thermistor Th whose resistance value changes according to the temperature. At this time, the signal detected by the thermistor Th is transferred to the microcomputer through the resistor R4. 1 is input to the input terminal I1 and the signal voltage is equal to or higher than the arbitrarily set reference voltage, the microcomputer 1 determines that the temperature inside the drum is high. It is determined that the internal temperature is low (step 108), and the time for predetermined cooling is delayed (step 109).

Subsequently, through the output terminal 03, the high signal "1" is converted into the low signal "0", and the low signal "0" is output to cause the abnormality presence / absence display portion 5 to turn on the light emitting diode LED1. Steps 108-110 are repeatedly performed until the temperature becomes lower than a predetermined reference temperature, indicating that the temperature is being heated, that is, the temperature is increasing.

On the other hand, when the temperature is input from the temperature detecting unit 4 at an arbitrary reference voltage or less with respect to the temperature, it is considered that the temperature in the drum is not heated, and the door opening / closing drive unit 6 in the next stage is considered. At this time, when the signal or the like input from the water level detection unit 3 and the temperature detection unit 4 in the microcomputer 1 is detected below the arbitrarily selected reference frequency and voltage. Only, the high signal "1" is output from the output terminal 01 (step 111).
Therefore, in the door opening / closing drive unit 6, when the water level and the temperature in the drum become equal to or lower than the arbitrarily set reference value through the above process, the high signal "1" is output from the output terminal 01 of the microcomputer 1 through the resistor R3. Since the transistor TR1 is driven by being turned on, the gate terminal G of the triac TRIAC is triggered, the triac TRIAC is turned on, and the common AC power supply AC drives the solenoid SOL. It means that the door D is opened by pulling the door hook D-HOOK communicating with this. Next, the output port 03 outputs a high signal "1" to prevent current from flowing through the light emitting diode LED1 to turn off the light emitting diode LED1 and display that there is no abnormality (step 112).

[0017]

As described above, according to the present invention, when the door of the drum washing machine is opened and closed, when the water level and the temperature in the drum are detected and the value is above the arbitrarily set reference value, the presence / absence of an abnormality is displayed. When the door of the drum washing machine is opened / closed, the water in the drum flows out to the outside when the door is opened and closed. It is possible to obtain an excellent effect that problems such as burns due to hot water inside can be solved.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a door opening / closing device of a drum washing machine according to the present invention.

FIG. 2 is a flowchart showing a control process of a door opening / closing device according to the present invention.

FIG. 3 is a graph showing an output frequency with respect to a water level sensed by a sensing sensor of a water level sensing unit according to the present invention.

[Explanation of symbols]

 1 Microcomputer 2 Door signal output unit 3 Water level sensing unit 4 Temperature sensing unit 5 Abnormality presence / absence display unit 6 Door opening / closing drive unit AC common AC power supply R1-R8 resistance TRIAC TRIAC TR transistor LED LED light lamp D diode LS water level sensor Th thermistor SOL solenoid

Claims (3)

[Scope of utility model registration request] 1. A door opening / closing device for a drum washing machine,
A door signal output means for outputting a door open signal by the user's washing, a water level sensing means for sensing a water level inside the washing machine drum and outputting a signal corresponding to the water level, and a temperature inside the washing machine drum. Temperature sensing means for sensing the temperature and outputting a signal corresponding to the temperature, and processing by receiving signals from the water level sensing means and the temperature sensing means and outputting an abnormality presence / absence signal to determine the water level and temperature in the drum. A microcomputer that outputs a door open signal, a display unit that receives an abnormality presence / absence signal from the microcomputer and displays the status thereof, and a door that opens the door by receiving a door open signal from the microcomputer when A door opening / closing device for a drum washing machine, which is configured by an opening drive means. 2. The microcomputer performs a drainage function until the water level in the drum is a predetermined value or more and becomes a predetermined value or less, and when the temperature in the drum is a predetermined value or more, it is less than or equal to a predetermined value. 2. The door opening / closing device for a drum washing machine according to claim 1, wherein a predetermined time is delayed until the time. 3. A method of controlling a door opening / closing device of a drum washing machine, the steps of initializing and outputting and inputting a signal at each input / output port, and storing data input at the input port. The signal input from the door opening input port among the input ports is delayed for a predetermined time and then input, and it is determined whether the door opening signal is input from the door opening input port, and the door opening signal is not input. In the case of returning to the main program, when the door opening signal is input, the step proceeds to the next step, and in the step, when the door opening signal is input, determining the water level in the washing machine drum, and the step In the case where the water level is above a predetermined value, a step of performing a drainage stroke, displaying an abnormal state, and repeating the steps of judging the water level in the washing machine drum; In the case where the water level is lower than or equal to a predetermined value, a step of determining whether the drum inner temperature is higher than or equal to a predetermined value, and in the step, when the drum inner temperature is higher than or equal to the predetermined value, a predetermined time is delayed to cause an abnormal condition. Is displayed, and a step of repeating from the step of determining whether the drum internal temperature is equal to or higher than a predetermined value, and in the step, if the drum internal temperature is not equal to or higher than the predetermined value, the door opening / closing drive means is driven, and the display means is abnormal. A method for controlling a door opening / closing device of a drum washing machine, the method comprising the step of displaying that there is no.