JP3164884B2 - Clothes dryer - Google Patents

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 clothes by circulating warm air in a drum for drying clothes.

[0002]

2. Description of the Related Art Conventionally, in this type of clothes dryer, the rotational speed of a motor for driving a drum and a fan which is a blowing means depends on an AC power supply frequency. By changing the rotational speeds of the drum and the fan to be the same, the influence of the frequency of the drying performance was eliminated.

[0003]

In such a conventional clothes dryer, it is necessary to replace parts in accordance with the AC power supply frequency, and the products for 50 Hz and 60 Hz must be separately managed and sold. did not become. In addition, if the AC power supply frequency is used incorrectly, there is a problem that the operation sound becomes loud, the drying operation is terminated without drying, and the drying time becomes long.

The present invention solves the above-mentioned problem, and does not require replacement of parts even when the AC power supply frequency is different, and sets the rotational speeds of the drum and the fan to the set rotational speed regardless of the AC power supply frequency of 50 Hz or 60 Hz. The purpose is to control and make it possible to dry optimally even if the power supply frequency changes.

[0005]

In order to achieve the above object, the present invention provides a drum for drying clothes, a blowing means for circulating warm air into the drum, and a heating device provided in a blowing path to the drum. Means, a motor for rotating the blowing means or the drum, and a rotation control means for controlling the number of rotations of the motor, the rotation control means, power switching means for controlling the energization to the motor, a conduction time control means for controlling the conduction angle of the power switching hands stage, comprising a rotation speed setting means for setting a revolution speed of the motor, the rotational speed detection means for detecting the rotational speed of the motor, the rotational speed setting Means for controlling the conduction angle of the power switching means in accordance with the difference between the means and the detection of the rotational speed detecting means, and controlling the motor to a set rotational speed. To have. Also, do clothes drying
Ram, blowing means for circulating warm air into the drum,
Heating means provided in a blowing path to the drum;
Means or a motor for rotating the drum, and the motor
E Bei and rotation control means for controlling the rotational speed of the over data, the times
Rotation control means for controlling power supply to the motor.
Switching means and conduction of the power switching means
The conduction time control means for controlling the angle and the number of rotations of the drum are set.
Rotation speed setting means for detecting the rotation speed of the drum.
Rotation speed detection means, the rotation speed setting means and
Power switching according to the difference in detection of the rotation speed detection means
Control the conduction angle of the means and control the drum to the set number of revolutions
This is the means for solving the problem.

[0006]

According to the present invention, the number of revolutions can be controlled to the set number of revolutions irrespective of the AC power supply frequency of 50 Hz or 60 Hz by the above-mentioned problem solving means. Can be used in any area, and the number of revolutions is controlled to the set number of revolutions, so that a stable number of revolutions can be obtained.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 1, a drum 1 stores a material to be dried, and a heat exchange fan (blower means) 2 circulates warm air in the drum 1. The heat exchange fan 2 circulates warm air in the drum 1 and simultaneously takes in air from the outside to cool the fan and dehumidifies the circulating air in the drum 1. PTC
The heater (heating means) 3 is disposed in a blowing path to the drum 1, that is, in a circulating air intake, and heats the circulating air. The motor 4 drives the drum 1 and the heat exchange fan 2 to rotate, and controls the number of rotations of the motor 4 so that the number of rotations of the drum 1 and the heat exchange fan 2 can be controlled. The rotation sensor 50 for rotation control may be attached to the motor 4, but in this embodiment, the rotation sensor 50 detects the rotation speed of the drum 1, and the magnetic sensor 50a is fixed to the main body, and the magnet 50b is attached to the drum. I have it. Drum 1 with 3 magnets 50b
By installing six, the number of rotations can be detected and controlled to a set value. In this way, not only stable rotation control of the motor 4 and the drum 1 can be performed, but also a failure of the belt, which is a rotation transmitting means between the drum 1 and the motor 4, can be detected. When the drum 1 and the heat exchange fan 2 are driven by different motors respectively, the drum 1 or the heat exchange fan 2
The rotation sensor 50 is attached to the drive motor of the.

The rotation control means 5 controls the number of rotations of the drum 1 to the number of rotations set by the number of rotations setting means 6.
The difference between the rotation speed of the motor 4 and the rotation speed of the rotation speed setting means 6 is compared by the rotation speed comparison means 52, and the power switching means 54 such as a bidirectional thyristor is controlled by the conduction time control means 53. Variable number. Phase control is considered as the simplest conduction time control method. In the case of an inverter, not only the conduction time but also the frequency is controlled. The AC power supply 7 connects the PTC heaters 3a and 3b and the contacts 8a and 8b of the relay in series.

An outline of the operation of the above configuration will be described with reference to FIGS. 3 and 4. FIG.
In this case, the rotation speed of the drum 1 becomes the maximum when the full-wave current is applied. In FIG. 3B, since the current is supplied only during the conduction time T, the rotation speed of the drum 1 can be changed according to the conduction time T. Magnetic sensor 50a of rotation sensor 50 and magnet 5
As shown in FIG. 4, when four magnets 50 b are mounted on the drum 1, the on / off signal by 0 b is
During rotation, the magnetic sensor 50a turns on four times. The rotation number detecting means 51 controls the drum 1 based on the cycle Tx for each ON / OFF cycle (1/4 rotation of the drum) of the magnetic sensor 50a.
The number of rotations is detected and determined. The rotation speed comparison means 52 compares the difference between the rotation speed of the drum 1 detected and determined by the rotation speed detection means 51 and the rotation speed of the rotation speed setting means 6, and controls the power switching means 54 by the conduction time control means 53. Each time the rotation speed is determined, the drum 1 is controlled to the set rotation speed. Therefore, the time required to reach the set rotation speed is short, and a stable rotation speed can be obtained.

Next, the operation will be described in detail with reference to FIG. 5. First, at step 11, the number of revolutions of the drum 1 is set. In step 12, the ON signal of the magnetic sensor 50a is detected, and every time the ON signal is detected, in the rotation control subroutine in step 13, the set rotation speed Ns set by the rotation speed setting means 6 and the rotation speed detected by the rotation speed detection means 51 are calculated. Then, the operation amount of the rotation speed control, that is, the conduction angle is controlled according to the error from the setting, and the rotation speed control is performed. When drying is detected in step 15, the end of the drying operation is determined.

In this embodiment, the rotation sensor 50 is
Although attached to the drum 1, similar effects can be obtained by providing the heat exchange fan 2 or the motor 4. Although the case where the rotation speed of the drum 1 and the heat exchange fan 2 is driven by one motor 4 has been described, the effect is the same when two motors are provided respectively. Although the magnetic sensor 50a and the magnet 50b are used as the rotation sensor 50, a reflection type or transmission type optical sensor may be used. Also, the magnetic sensor 50a
Although the control of the number of revolutions is performed for each ON signal, the control of the number of revolutions may be performed at regular intervals.

[0013]

As is apparent from the above embodiments, according to the present invention, a drum for drying clothes, a blowing means for circulating warm air into the drum, and a heating means provided in a blowing path to the drum. Means, a motor that rotationally drives the blowing means or the drum, and rotation control means for controlling the number of rotations of the motor, wherein the rotation control means controls power supply to the motor, a conduction time control means for controlling the conduction angle of the power switching hands stage, comprising a rotation speed setting means for setting a revolution speed of the motor, the rotational speed detection means for detecting the rotational speed of the motor, the rotational speed setting Means for controlling the conduction angle of the power switching means in accordance with the difference between the means and the rotation number detection means, controlling the motor to the rotation number, and irrespective of the AC power supply frequency. It is so arranged to control the setting rotational speed, stable rotation speed of the drum or blowing means irrespective to an AC power source frequency.

Further, the rotation control means, Mo Tama other detects the rotational speed of one of the drum, it is so arranged to control the speed setting for each determined speed time to reach the set rotational speed And a stable rotation speed can be obtained.

[Brief description of the drawings]

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

FIG. 2 is a sectional view of the clothes dryer.

FIGS. 3A and 3B are current waveform diagrams of a motor of the clothes dryer.

FIG. 4 is an ON / OFF signal waveform diagram of a rotation sensor of the clothes dryer.

FIG. 5 is an operation flowchart of a main part of the clothes dryer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drum 2 Heat exchange fan (blowing means) 3 PTC heater (heating means) 4 Motor 5 Rotation control means

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shoichi Matsui 1006 Kazuma Kadoma, Kadoma City, Osaka Inside Matsushita Electric Industrial Co., Ltd. (56) References JP-A-2-63499 (JP, A)

Claims (2)

(57) [Claims] 1. A drum for drying clothes, blowing means for circulating warm air into the drum, heating means provided on a blowing path to the drum, and a motor for rotating the blowing means or the drum. A rotation control means for controlling the number of rotations of the motor, wherein the rotation control means, power switching means for controlling the energization to the motor,
A conduction time control means for controlling the conduction angle of the power switching hands stage, comprising a rotation speed setting means for setting a revolution speed of the motor, the rotational speed detection means for detecting the rotational speed of the motor, the rotational speed setting controls the conduction angle of the power switching means in response to the difference between the detection means and the rotational speed detection means, clothing dry 燥機 which is adapted to control the motor to set the rotational speed. 2. A drum for drying clothes, and said drum.
Blowing means for circulating warm air inside, and blowing to the drum
Heating means provided in the passage, the blowing means or the dryer
Motor to rotate the motor and control the number of rotations of the motor
Rotation control means, wherein the rotation control means,
Power switching means for controlling energization of the motor;
At the time of conduction for controlling the conduction angle of the power switching means
Interval control means and a rotation speed setting means for setting the rotation speed of the drum.
A step, and a rotation speed detecting means for detecting a rotation speed of the drum.
The rotation speed setting means and the rotation speed detection means.
Controls the conduction angle of the power switching means according to the difference in knowledge
And a clothes dryer that controls the drum to a set number of revolutions.