JPH05245296A - Drum type clothing drier - Google Patents

Abstract

PURPOSE:To easily detect a cutoff of a belt driving a rotary drum by an in expensive method during the drying operation and prevent irregular drying. CONSTITUTION:A drum type clothing drier is provided with a current detecting device detecting the current value flowing in a driving motor and a comparing means comparing the currents Ia, Ib detected by the current detecting device with the preset current value A, and the operation of the driving motor is stopped when the current values Ia, Ib detected by the current detecting device are judged to be lower than the preset current value A, i.e., Ia, Ib<A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drum type clothes dryer.

[0002]

2. Description of the Related Art The structure of a conventional rotary drum type clothes dryer will be described below with reference to FIG. The rotary drum type clothes dryer includes a drum 1 for storing drying clothes. The drum 1 is rotatably supported by a support plate 3 provided with a plurality of hot air blowing holes 2. An exhaust port 7 is provided on the rear surface of the drum 1, and a thread waste filter 6 is provided so as to cover the exhaust port 7. The lint filter 6 is protected by a filter guard 5 and is structured so that it can be easily attached to and detached from the drum 1.

Behind the drum 1 is provided a double-blade fan 8 which also functions as a heat exchanger for dehumidification. The double-blade fan 8 is rotatably supported by the drum shaft 4. The drum 1 is rotated by a drum driving motor 19 via a drum belt 16. On the other hand, the both-wing fan 8 is rotated by a fan driving motor 18 via a fan belt 15.

Due to the rotation of the double-blade fan 8, the air flows in the direction of arrow A.
Direction, that is, through the duct 10 into the drum 1 from the air outlet 2 and then through the thread waste filter 6 and the exhaust port 7 to return to the double-blade fan 8 again. A heater 11 is provided in the duct 10 and in front of the air outlet 2.

The air is heated by the heater 11 to become warm air, which heats the clothes in the drum 1 to evaporate the moisture.

On the other hand, the drum is low speed (40-60 vpm)
The clothes for drying are rotated by the centrifugal force generated by the rotation of the drum 1 and lifted above the drum 1 by the drum baffle 17 and dropped by the weight of the drum 1 (tamping). Good contact with clothing is maintained. By repeating the above steps, the clothes inside the drum 1 are dried.

However, in the above clothes dryer, if the belt 16 for transmitting the rotation of the drum driving motor 19 to the drum is broken during operation, the function of the dryer cannot be utilized and sufficient drying cannot be performed. There was a flaw.

Therefore, in order to solve the above drawbacks, a technique disclosed in Japanese Utility Model Laid-Open No. 60-33996 is known.

This is because an idler pulley that gives tension to the belt is attached to the tip of the idler arm, and when the belt is broken, the idler arm rotates, and the rotation of the idler arm activates a detection switch to dry the circuit. When the belt is cut, the abnormality notification circuit is energized to notify that the belt is broken.

[0010]

In the above-mentioned structure, since the breakage of the belt is mechanically detected, a detection component is required and the cost is high, and a place to mount the component is also required. Since it was complicated, it took time to assemble.

[0011]

As a means for solving the above-mentioned problems, the present invention comprises a rotary drum for accommodating an object to be dried and a belt and a drive motor for independently driving a double-blade fan, A drum type clothes dryer having a heater for supplying heated air to a rotating drum, wherein the drive motor and the heater are controlled by a control circuit such as a computer; and a current detection device for detecting a current value flowing through the drive motor. Provided with a comparison means for comparing the current value detected by the current detection device with a preset current value, and it is determined that the current value detected by the current detection device is lower than the preset current value. If so, a control device for stopping the operation of the drive motor is provided.

[0012]

[Operation] If the belt is cut during the drying operation, the load on the drive motor is reduced, and the current value detected by the current detection device is reduced, and it is determined that the current value is lower than the preset value compared with the preset current value. If this happens, it is determined that the belt has run out, and the dryer operation automatically stops.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional view of a drum type clothes dryer of the present invention, FIG. 2 is a block diagram thereof, and FIG. 3 is a flowchart thereof. The same parts as those in the conventional example are designated by the same reference numerals.

The structure is almost the same as that of the conventional rotary drum type clothes dryer. The drum 1 for containing the clothes for drying is rotatably supported by the drum shaft 4 and the other side is rotatably supported by the support plate 3. It is supported.

A yarn waste filter 6 and a filter guard 5 are provided on the side surface of the drum 1 before the exhaust port 7. 17
Is a drum baffle fixed to the inner peripheral surface of the drum 1. Reference numeral 8 denotes a double-blade fan, which allows the drive motor 18 to rotate via the fan belt 15 independently of the drum 1. Reference numeral 19 denotes a drum driving motor, which is a drum belt 1
The drum 1 is rotated via 6. Reference numeral 11 is a drying heater (PTC heater), and 2 is a warm air outlet provided in the support plate 3.

Reference numeral 10 is a duct for circulating warm air, and 12 is a drain port provided at the lowest position of the duct 10.
Reference numerals 13 and 14 denote thermistors provided in the warm air circulation path, which are used for detection of completion of drying, detection of temperature rise, and the like.

FIG. 2 is a block diagram of an embodiment of the drum type clothes dryer according to the present invention. An input switch 21 for instructing start / pause, a thermistor signal 22 for detecting the circulating air temperature, a drum drive motor current detection device signal 23, etc. are input to the microcomputer 25 of the control circuit 24 and stored in the microcomputer. The operation of the display unit 27, the heater 11, the drum driving motor 19, and the fan driving motor 18 is controlled via the driver 26 based on a program.

Next, the operation of the drum type clothes dryer according to the present invention will be described with reference to the simple flowchart of FIG. When the operation is started, the PTC heater 11, the double-wing fan 8 driving motor 18 and the drum driving motor 1
Energization is performed on 9. The drum drive motor 19 repeats normal rotation → stop → reverse → stop in order to prevent the cloth from being twisted and entangled.

The current values Ia and Ib applied to the drum driving motor 19 at the time of normal rotation and at the time of reverse rotation are detected, and the microcomputer 25 compares them with the reference value A.

If each of Ia and Ib is A or less, it is determined that the drum belt 16 is broken, the heater 11, the drum driving motor 19, and the fan driving motor 18 are de-energized to notify the abnormality of the display unit 27. Energize the lamp.

In addition to the present embodiment, it is possible to perform the measurement a plurality of times in order to improve the accuracy and perform the rendering processing in a form that makes it easy to compare the data of the drum driving motor current.

It has been known that the current value of the drive motor is detected and the capacity of the material to be dried in the drum is determined based on the current value. This control device has the above-mentioned means of the present invention. It goes without saying that the capacity determination and the belt breakage detection can be performed with a single current detection device by adding.

In the present invention, in which the belt breakage is detected by the current value and the operation of the dryer is stopped, it is well known that the notifying means for notifying the belt breakage is provided, and a detailed description thereof will be omitted.

[0024]

Since the present invention is constructed as described above, it has the following effects. Since it is only necessary to provide a current detection device and compare the current value during operation with a preset current value, it is possible to carry out with a slight cost increase compared with a control circuit consisting of a conventional microcomputer, and a control circuit The place where the is installed can be installed in almost the same place as before.

Further, in the case of having the control circuit for detecting the capacity of the material to be dried by the current detection, it can be easily implemented by only changing a part of the comparing means.

[Brief description of drawings]

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

FIG. 2 is a control block diagram of the same.

FIG. 3 is a flowchart of the same operation.

FIG. 4 is a vertical sectional view of a conventional drum type clothes dryer.

[Explanation of symbols]

 11 heater 18 fan drive motor 19 drum drive motor 23 current detector 24 control circuit 25 microcomputer 26 driver 27 display section

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Onishi 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Within Sharp Co., Ltd. Co., Ltd. (72) Inventor Masahiro Sato 22-22 Nagachimachi, Abeno-ku, Osaka-shi, Osaka Prefecture Sharp Corporation (72) Inventor Susumu Kitamura 22-22 Nagaike-cho, Abeno-ku, Osaka City, Osaka

Claims (1)

[Claims] 1. A rotary drum for accommodating a material to be dried, a belt for independently driving a double-blade fan, and a drive motor, a heater for supplying heated air to the rotary drum, the drive motor and the heater. In a drum type clothes dryer controlled by a control circuit including a computer, a current detection device for detecting a current value flowing in the drive motor, a current value detected by the current detection device and a preset current value. And a control device for stopping the operation of the drive motor when it is determined that the current value detected by the current detection device is lower than a preset current value. Drum type clothes dryer characterized by.