JPH09253397A - Clothes drier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To judge the entanglement of objects to be dried by detecting the conducting angle of a motor voltage, to loosen the entanglement of the objects to be dried and to eliminate drying irregularity in a clothes drier for drying the objects to be dried such as clothes or the like. SOLUTION: A heater 4 is provided in a blowing route into a rotary drum 2 for drying the clothes, hot air is blown to the rotary drum 2 by a heat exchange type fan 3, the rotary drum 2 and the heat exchange type fan 3 are rotationally driven by a motor 7 and the motor 7 and the heater 4, etc., are controlled by a control means 8. The control means 8 controls the conducting angle of the voltage applied to the motor 7 corresponding to the size of the load of the motor 7 and inversely rotates the motor 7 in the case that the conducting angle is more than a first stipulated value and duration is longer than first stipulated time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clothes dryer for drying an article to be dried such as clothes.

[0002]

2. Description of the Related Art Conventionally, a clothes dryer of this type is disclosed in Japanese Patent Laid-Open No.
It was constructed as described in JP-A-3-315100. In the clothes dryer described in Japanese Patent Laid-Open No. 63-315100, since the rotating drum rotates in only one direction, if the material to be dried in the rotating drum is entangled during the drying operation, uneven drying or There are cases in which the drying operation is interrupted due to the motor lock, and as measures against this, motor lock detection or clogging detection means has been disclosed.

As another measure, Japanese Patent Publication No. 7-1148
In the one described in Japanese Patent No. 78, when the absolute value of the PTC heater current becomes equal to or less than a predetermined value, the motor is reversely rotated for a predetermined time.

[0004]

However, in such a conventional structure, the rotation of the fan is reduced especially when a motor is used which controls the conduction angle to control the phase angle to keep the rotation speed constant. Since the number of air blowers is almost constant, the air flow rate does not change. As a result, the PTC heater current does not change even when tangled with the material to be dried in the rotating drum during the drying operation, and the change in the heater current was used. There is a problem that the motor rotation direction control cannot be realized.

The present invention solves the above-mentioned conventional problems. It is possible to determine the entanglement of an object to be dried by detecting the conduction angle of the motor voltage, and to unravel the entanglement of the object to be dried to eliminate unevenness in drying. Has an aim.

[0006]

In the clothes dryer of the present invention, a heater is provided in an air blowing path into a rotating drum for drying clothes, and a hot air is blown to the rotating drum by a heat exchange type fan, thereby rotating the rotating drum. The heat exchange type fan is driven to rotate by the motor, and the motor and the heater are controlled by the control means, and the control means controls the conduction angle of the voltage applied to the motor according to the magnitude of the load of the motor. The motor is rotated in the reverse direction when the conduction angle is equal to or greater than the first specified value and the duration is equal to or greater than the first specified time.

Thus, when the material to be dried in the rotary drum is entangled, the entanglement of the material to be dried is determined by detecting the conduction angle of the motor voltage, and the motor is rotated in the reverse direction to rotate the rotary drum in the reverse direction. By this, the entanglement of the material to be dried can be disentangled, and unevenness in drying can be eliminated.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention is provided in a rotary drum for drying clothes, a blowing means for blowing warm air to the rotary drum, and a blowing path into the rotary drum. Heating means, a motor for driving the rotary drum and the blowing means to rotate, and a control means for controlling the motor, the heating means, etc., the control means corresponding to the magnitude of the load of the motor. The conduction angle of the voltage applied to the motor is controlled so that the motor is rotated in the reverse direction when the conduction angle is equal to or greater than the first specified value and the duration is equal to or greater than the first specified time. If the material to be dried is entangled, the load applied to the motor increases and the conduction angle of the motor voltage increases, and the entanglement of the material to be dried can be determined by detecting the conduction angle of the motor voltage. Entangled items to be dried By reversely rotating the rotary drum by reverse rotation of the motor case, it is possible to loosen the entanglement of the material to be dried, it is possible to eliminate drying marks.

[0009]

An embodiment of the present invention will be described below with reference to FIG.

As shown in the figure, the clothes dryer main body 1 has a rotary drum 2, a heat exchange type fan (blowing means) 3, a heater (heating means) 4, etc. inside, and heat exchange with the rotary drum 2. The mold fan 3 and the heater 4 are connected to the circulation ducts 5a, 5b, 5
c has a substantially integrated structure to form a circulating ventilation path for the circulating dehumidifying clothes dryer, and the heat exchange type fan 3 rotates, whereby the inside of the circulation ducts 5a, 5b, 5C and the inside of the rotating drum 2 are formed. It is configured to circulate air.

The heater 4 and the rotary drum 2 are provided with a circulation duct 5
They are interconnected at b. A temperature sensor 6 a for measuring the temperature of exhaust gas from the rotating drum 2 is attached to the air circulation duct 5 c between the rotating drum 2 and the heat exchange type fan 3. Further, a temperature sensor 6b that measures the temperature of the air that has become low after heat exchange is attached to the circulation duct 5a between the heat exchange type fan 3 and the heater 4. The air having a low temperature after the heat exchange inside the circulation duct 5a is reheated by the heater 4 and blown into the inside of the rotary drum 2 through the circulation duct 5b.

The rotary drum 2 rotates and the clothes to be dried are exposed to the above-mentioned heated air to evaporate moisture, and the clothes are dried. The air containing a large amount of water vapor is discharged from the rotary drum 2, and is heat-exchanged with the low temperature outside air by the heat exchange type fan 3 through the circulation duct 5c to condense the water vapor. The low-temperature air is blown to the circulation duct 5a. The water droplets are discharged to the outside of the clothes dryer main body 1 through a discharge hole (not shown).

The motor 7 is connected to the rotary drum 2 and the heat exchange type fan 3 via a belt (not shown) and serves as a power source for rotation. The control means 8 is composed of a microcomputer, has an input port 8a, a computing means 8b, a storage means 8c and an output port 8d, and has a storage means 8c and an output port 8d having a plurality of terminals and a plurality of terminals. By connecting the input port 8a and the computing means 8b, various controls relating to clothes drying are performed.

The input means 9 is a heater changeover switch 9a,
A course selection switch 9b, a start / temporary stop switch 9c, and a power switch 9d are provided for the user to input necessary initial setting operations. The display means 10 includes a clogging indicator 10a, a strong indicator 10b and a weak indicator 10c corresponding to the heater changeover switch 9a, a standard indicator 10e corresponding to the course selection switch 9b, a finish indicator 10f, and a thick material indicator. 10g, diaper sterilization indicator 10h
And a shirt display 10i. The clogging indicator 10a is attached to a path through which air is discharged from the inside of the rotary drum 2 to the circulation duct 5c, and indicates that the filter (not shown) for removing cotton dust is clogged with the temperature of the temperature sensor 6a. Displayed when detected by rising.

The rotation detecting means 11 detects the number of rotations of the rotary drum 2 and inputs its output to the control means 8. The control means 8 controls the conduction angle of the voltage applied to the motor 7 in accordance with the magnitude of the load applied to the motor 7,
When the conduction angle is equal to or greater than the first prescribed value and the duration is equal to or greater than the first prescribed time, the motor 7 is rotated in the reverse direction, and in the reverse rotation state, the conduction angle is equal to or greater than the first prescribed value and the duration is When the time is equal to or longer than the specified time of 1, the heater 4 and the motor 7 are provided with a function of cutting off the power supply.

To explain the operation in the above configuration, when a necessary initial setting operation is input from the input means 9, the input signal passes through the input port 8a of the control means 8 and the arithmetic means 8b.
At, the arithmetic processing is performed according to the program stored in the storage means 8c, and the calculation result is displayed on the display means 10 via the output port 8d.

When the start / temporary stop switch 9c of the input means 9 is pressed after confirming the content initially set by the course selection switch 9b of the input means 9 with the display content of the display means 10, a drying operation start signal It is transmitted to the calculating means 8b via the corresponding input terminal of the input port 8a, and after the necessary calculation,
A control signal is transmitted from the output port 8d to the motor 7, and as a result, the rotary drum 2 and the heat exchange type fan 3 are started.

The rotation signal detected by the rotation detecting means 11 is transmitted to the calculating means 8b via the input port 8a, and the calculating means 8b performs necessary calculation processing to generate a control signal. The control signal is applied to the gate terminal (not shown) of the bidirectional thyristor (not shown) that controls the supply voltage of the motor 7, and as shown in FIG. The voltage is supplied to the motor 7.

When the mass of the material to be dried in the rotary drum 2 is small (that is, light load), the conduction angle α becomes small and becomes αL, as shown in FIG. 2 (b). On the contrary, when the material to be dried has a large mass (that is, a heavy load), the conduction angle α is as shown in FIG.
It becomes large as shown in FIG. Further, even when the mass of the material to be dried in the rotary drum 2 is small, when the material to be dried is entangled, the conduction angle α becomes large as shown in FIG. 2C and becomes αH. In this way, the control means 8 controls the conduction angle α appropriately (addition / subtraction control) to control so that the rotational speeds of the rotary drum 2 and the heat exchange type fan 3 are always kept constant.

Next, the control of the motor 7 will be described with reference to FIG. When the drying operation is started, the control means 8 starts a rotation status monitoring subroutine of the motor 7. In step 21, it is determined whether or not the conduction angle α of the voltage supplied to the motor 7 exceeds the first specified value. If it exceeds, the process proceeds to step 22, and if it is less, the process proceeds to step 23. In step 22, it is determined whether or not the conduction angle α continuously exceeds the first specified value for a period of the first specified time or longer. If not, the process proceeds to step 23 and continues. If so, go to step 24.

In step 23, a signal for continuing normal operation is issued, and the process returns to step 21. In step 24, the operation of the motor 7 is stopped, and the process proceeds to step 25. Step 25
Then, the reverse rotation operation start signal of the motor 7 is issued and the motor 7
Is reversely rotated and the process proceeds to step 26. In step 26,
It is determined whether the conduction angle α exceeds the first specified value,
If it exceeds, proceed to step 27, and if it is less, step 2
Proceed to 8.

In step 27, it is judged whether or not the conduction angle α continuously exceeds the first specified value for the period of the first specified time or longer. If not, the process proceeds to step 28,
If it is continuing, go to step 31.

In step 28, it is judged whether or not the reversal operation period of the motor 7 has passed the second specified time. If not, the process returns to step 26, and if it has passed, the process proceeds to step 29. In step 29, the operation of the motor 7 is stopped, the process proceeds to step 30, the normal operation of the motor 7 is restarted, and the process proceeds to step 21. In step 31, power supply to the heater 4 and the motor 7 is cut off, and the process returns to the main routine.

As described above, the motor 7 is rotated in the reverse direction when the conduction angle of the voltage applied to the motor 7 is the first specified value or more and the duration is the first specified time or more. Yes, if the material to be dried is tangled in the rotating drum,
The load applied to the motor is increased and the conduction angle of the motor voltage is increased.By detecting the conduction angle of the motor voltage, the entanglement of the dried object can be determined. By rotating in reverse and rotating the rotating drum in reverse, the entanglement of the material to be dried can be loosened,
Drying unevenness can be eliminated.

[0025]

As described above, according to the invention described in claim 1 of the present invention, the rotary drum for drying clothes, the blowing means for blowing warm air to the rotary drum, and the inside of the rotary drum are provided. The heating means provided in the air blowing path, the motor that rotationally drives the rotary drum and the air blowing means, and the control means that controls the motor, the heating means, etc. Then, the conduction angle of the voltage applied to the motor is controlled, and when the conduction angle is equal to or greater than the first specified value and the duration is equal to or greater than the first specified time, the motor is reversely rotated. When the material to be dried in the rotating drum is entangled, the load applied to the motor is increased and the conduction angle of the motor voltage is increased, and the entanglement of the material to be dried can be determined by detecting the conduction angle of the motor voltage. Can be dried By reversely rotating the rotary drum by reverse rotation of the motor when the waiting can loosen tangled material to be dried, it is possible to eliminate drying marks.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of a clothes dryer according to an embodiment of the present invention.

[Fig. 2] (a) Waveform diagram of the voltage supplied to the motor under normal load of the clothes dryer (b) Waveform diagram of the voltage supplied to the motor under light load of the clothes dryer (c) Drying of the clothes Diagram of the voltage supplied to the motor when the machine is under heavy load

FIG. 3 is a flowchart illustrating a subroutine for monitoring a rotation status of a motor of the clothes dryer.

[Explanation of symbols]

 2 rotating drum 3 heat exchange type fan (blowing means) 4 heater (heating means) 7 motor 8 control means

Claims (1)

[Claims] 1. A rotating drum for drying clothes, an air blowing unit for blowing warm air to the rotating drum, a heating unit provided in an air blowing path into the rotating drum, and a rotary driving unit for rotating the rotating drum and the air blowing unit. And a control means for controlling the motor and the heating means. The control means controls the conduction angle of the voltage applied to the motor according to the magnitude of the load of the motor, and the conduction angle. Is a first specified value or more and the duration is a first specified time or more, the clothes dryer is configured to rotate the motor in a reverse direction.