JP3152578B2 - Rotary drum type 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 structure for detecting an abnormality such as a belt rotating a rotating drum of a rotating drum type clothes dryer.

[0002]

2. Description of the Related Art In a rotating drum type clothes dryer, a rotating drum for storing clothes is rotated via a belt wrapped around a pulley mounted on a drive shaft of a drive motor. If the belt tension mechanism breaks down, the rotating drum will not normally rotate or stop. In such a case, hot air is intensively applied to some of the clothes in the drum, and the clothes that are weak to heat are discolored or burnt, and in the worst case, they are ignited.

[0003]

In order to solve such a problem, for example, in the invention of Japanese Patent Application Laid-Open No. 60-48795, an abnormality is detected by detecting a displacement of a spring of a tension mechanism. However, when the detection is performed using such a mechanical structure, mechanical parts are required and the cost is increased, and the assembling is troublesome.

The present invention has been made in view of the above circumstances, and an object of the present invention is to make it possible to detect an abnormality of a belt or the like rotating a rotating drum in a rotating drum type clothes dryer with a simple configuration.

[0005]

According to the first aspect of the present invention, there is provided a rotary drum type clothes dryer configured to rotate a rotary drum for storing clothes through a belt by operating a drive motor. Rotation amount detection means for detecting the rotation amount of the drive motor, power supply stop means for stopping power supply to the drive motor in an initial operation, and the drive motor detected by the rotation amount detection means during the power supply stop. An abnormality notification output means for outputting an abnormality notification when the rotation amount exceeds a set value is provided.

According to a second aspect of the present invention, in the first aspect of the invention, the rotation amount detecting means detects a rotation amount of a pulley mounted on a drive shaft of the drive motor and on which the belt is wound. did.

According to a third aspect of the present invention, in the second aspect of the present invention, the rotation amount of the pulley is set to a rotation speed until the pulley stops and / or a time until the pulley stops rotating. And

[0008]

According to the first aspect of the present invention, when the amount of rotation of the drive motor due to inertia when the power supply to the drive motor is stopped in the early stage of operation exceeds the set value, an abnormality notification output is performed. If the belt is properly hanging on the pulley,
Since the load from the belt side is applied to the drive motor, the amount of inertial rotation is small, and increases in an abnormal state.

According to the second aspect of the present invention, the rotation amount of the drive motor is detected by the rotation amount of the pulley on which the belt is applied.

According to the third aspect of the present invention, when the number of rotations until the pulley stops and / or the time until the pulley stops rotating exceeds the set value, the abnormality notification output is performed.

[0011]

1 is a sectional view of a rotary drum type clothes dryer according to the present invention, and FIG. 2 is a block diagram showing the structure.

First, the overall structure of the rotary drum type clothes dryer will be briefly described. Reference numeral 1 denotes a rotating drum for storing clothes, and the rotating drum 1 is rotatably provided in the apparatus with a rotating shaft 2 protruding to a rear portion thereof, and a belt 3 wound around the outer periphery.
Is to be rotated. Reference numeral 4 denotes a drive motor, and a pulley 6 on which the belt 3 is hung is attached to one end of a drive shaft 5. The drive motor 4 is provided with a unique rotation amount detection sensor. A magnet is buried in a part of the pulley 6, and a Hall element 7 is disposed so as to face the pulley 6. The magnet and the Hall element 7 constitute a rotation amount detecting unit. In the Hall element 7, the pulley 6
A pulse corresponding to the number of rotations is generated. Reference numeral 8 denotes a tension mechanism, which is engaged with the belt 3 to apply tension. Reference numeral 10 denotes a two-sided fan, which is rotatably provided by being inserted into the rotary shaft 2 and rotated by a belt 13 wrapped around a pulley 12 attached to the other end of the drive shaft 5.

In the above configuration, the driving motor 4
Is operated, the rotary drum 1 and the double-sided fan 10 are both rotated, and the air passage 15 below the rotary drum 1 is rotated.
The drying operation of the clothes is performed by turning on the heater 16 provided at the front of the garment. That is, by the rotation of the double-sided fan 10, air is circulated in the rotary drum 1 on one side, from the rear to the lower part of the rotary drum 1, and further from the front into the rotary drum 1 as indicated by the arrows, and The cooling air introduced into the device from below is discharged from the rear lower portion to the outside of the device. In this way, heat exchange is performed in the double-sided fan 10 portion, whereby the humid air from inside the rotary drum 1 is cooled to generate condensed water, which is discharged from the drain port 17 and Is dried. Each of 18 is a temperature sensor for detecting the temperature of the circulating air.

In FIG. 2, reference numeral 20 denotes a control unit constituted by a microcomputer. The control unit 20 includes the drive motor 4, the Hall element 7, the heater 16, the temperature sensor 1
8 is connected, and further, a buzzer 21 for abnormality notification,
The display unit 22, the door switch 23, and the operation keys 24 are connected. The control unit 20 constitutes a power supply stop unit and an abnormality notification output unit.

The operation will be described with reference to the flowchart of FIG. The drive motor 4 is turned on (step 1)
Thereafter, when the rotation amount of the drive motor 4 reaches a fixed amount (1260 rpm during high power operation and 1150 rpm during normal operation) (step 2), the drive motor 4 is turned off (step 3). The rotation amount detection of the drive motor 4 is performed by a rotation amount detection sensor provided in the drive motor 4.
Then, the number of pulses P until the pulley 6 stops from the Hall element 7 and the time T until the pulse is no longer obtained, that is, the time until the pulley stops, are detected (step 4). Is compared with the set value (steps 5 and 6), and if either of them exceeds the set value, a notification is output indicating that there is an abnormality (step 7), and the buzzer 21 sounds. In this way, if there is an abnormality, the operation is automatically stopped to avoid concentrated heating of the clothing,
Further, the user is notified of the abnormality of the belt 3 and the like by the sound of the buzzer 21. If it is determined in Steps 5 and 6 that both the values do not exceed the set values and that the operation is normal, the drive motor 4 is turned on again (Step 8) and the normal operation starts.

In the above, if the belt 3 has come off and no load is applied from the belt 3 side, the drive motor 4
, The number of pulses P and the time T until the pulse is no longer obtained increase and exceed the set value. For example, in the case of normal coasting rotation, the pulse number P is 30, even when there is no clothes in the rotating drum 1 (no load).
The time T is about 3.5 seconds (when there is clothing, the pulse number P is further reduced and the time T is shortened). However, when the belt 3 is cut, the number of pulses P and the time T increase several times. Therefore, the set value pulse number P is 5
Abnormality determination is performed with 0 and the set value time T being 5 seconds.

In the above embodiment, the inertial rotation detection of the drive motor 4 is obtained from the pulley 6 side, but it may be obtained from the rotation amount detection sensor of the drive motor 4.

[0018]

According to the first aspect of the present invention, it is possible to provide a highly safe rotary drum type clothes dryer in which the operation is automatically stopped when there is an abnormality such as a broken belt. In a simple configuration, it is easy to assemble and at low cost.

Further, since the abnormality is detected in the early stage of the operation, the abnormality can be detected before the temperature in the rotating drum rises, so that the safety is extremely improved and the unnecessary operation in the abnormal state can be prevented.

Further, when the rotating drum is started, a large force is applied, so that the belt is likely to be cut. However, since the detection is performed when the belt is likely to be cut, the detection efficiency is high.

Further, according to the second and third aspects of the invention, the accuracy of abnormality detection is improved, and the effect of the first aspect is further enhanced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a rotary drum type clothes dryer according to the present invention.

FIG. 2 is a block diagram of the rotary drum type clothes dryer of the present invention.

FIG. 3 is a flowchart for explaining the operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotary drum 3 Belt 4 Drive motor 7 Hall element (rotation amount detection means) 2O control part (power supply stop means, abnormality notification output means)

Claims (3)

(57) [Claims] 1. A rotating drum type clothes dryer configured to rotate a rotating drum storing clothes through a belt by operation of a driving motor, a rotation amount detecting unit detecting a rotation amount of the driving motor, A power supply stopping means for stopping power supply to the drive motor at an early stage of operation, and an abnormality for outputting an abnormality notification output when the rotation amount of the drive motor detected by the rotation amount detection means during the power supply stop exceeds a set value. A rotary drum type clothes dryer, comprising: a notification output unit. 2. The rotary drum type clothes dryer according to claim 1, wherein said rotation amount detecting means detects a rotation amount of a pulley mounted on a drive shaft of said drive motor and to which said belt is applied. 3. The rotary drum type clothes dryer according to claim 2, wherein the amount of rotation of the pulley is set to a number of rotations until the pulley stops and / or a time until the pulley stops rotating.