JPS5856640Y2 - Clothes dryer with dryness detection - Google Patents

Description

[Detailed explanation of the invention] Conventional clothes dryers with dryness detection use a temperature detection method that utilizes the temperature difference between the exhaust temperature during drying and room temperature, and an electrode that is installed in the rotating drum and the clothes are brought into contact with this electrode. By doing so, the resistance between the electrodes, which changes depending on the degree of dryness of the clothing, can be detected.
There is an electrode method that amplifies this and interrupts the circuit.

In general, the former temperature detection method has the problem that the exhaust temperature changes depending on the amount and type of clothes, regardless of drying, so that uneven drying occurs or clothes tend to be undried.

In addition, in the latter electrode method, since the electrodes are installed inside the rotating drum, a slider must be installed on the outer periphery of the rotating drum to take the potential between the electrodes, which increases the cost and reduces the durability of the slider. Conventional electrode-based dryness detection has problems with the structure of the dryer and the location of the electrodes, resulting in uneven drying.

Particularly when the amount of material to be dried is small, there is a problem in that it operates regardless of the drying state because it does not come into contact with the electrodes.

In the present invention, the front surface of the rotating drum is divided into an inner circumferential plate and an outer circumferential plate, and the inner circumferential plate has a through hole for hot air flowing through the person at its lower part, a clothing slot in the center, and an outer circumferential plate. The outer circumferential plate is fixed to the front part of the frame, and the outer circumferential plate is rotatably supported with respect to the fixed inner circumferential plate, and on the inner surface of the lower part of the inner circumferential plate, a plate is deviated in the rotational direction of the rotating drum to adjust the degree of dryness of the clothes. By providing a sensing electrode, the clothes can be brought into contact with the electrodes without using a slider, and dryness can be detected with high accuracy. At the same time, the drying efficiency of clothes can be increased. be.

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

In FIG. 1, 1 is an outer frame of the clothes dryer, 2 is a rotating drum rotatably provided within the outer frame 1, and 3 is a rotating drum 2.
This is a fan case installed at the rear of the
Equipped with rotatable.

Reference numeral 5 designates a drive motor, and a drum pulley 6 and a fan pulley 7 are provided at both ends of the rotating shaft of the drive motor 5. The power of the drum pulley 6 is transmitted to the rotating drum 2 via the belt 8; The power of the fan 7 is transmitted to the fan 4 via the fan belt 9.

10 is a plurality of baffles provided in the rotating drum 2;
The clothes in the rotating drum 2 are agitated by falling over.

The rotating drum 2 has a front surface divided into an inner peripheral plate 11 and an outer peripheral part 12, and the inner peripheral plate 11 has a flange 1 on the inner peripheral part.
1a to form a clothing input port 13 and is fixed to the front surface of the main body 1.

Further, the outer circumferential plate 12 is rotatably supported by the outer circumferential portion of the fixed inner circumferential plate 11 via a bearing 14 .

15 is a lid provided on the main body 1 so as to be openable and closable so as to cover the clothes input port 13; 16 is an inner circumferential plate 1 of the rotating drum 2;
This heater case 16 is disposed in a space between the outer frame 1 and the front surface of the outer frame 1, and the heater case 16 is equipped with a heater 17 made of a positive characteristic semiconductor resistance element.

A backing 1 18 is attached to the front surface of the outer frame 1 and the flange 11 a of the inner peripheral plate 11, facing the heater 17.
9, this filter cover 18 has a plurality of intake holes 18a.
and a filter 20 is interposed between the heater 17 and the heater 17.

Reference numeral 21 designates a plurality of through holes provided in the lower part of the inner circumferential plate 11 facing the heater 17 .

Reference numeral 22 denotes an inner circumferential plate 11 constituting the front part of the rotating drum 2.
As shown in FIG. 2, an electrode is attached to the lower inner surface of the rotary drum 2 so as to be offset by about 45° in the rotational direction of the rotary drum 2.

Generally speaking, in rotary drum type clothes dryers, it is well known that the number of rotations of the drum is adjusted appropriately according to the diameter of the rotary drum in order to improve the agitation of the clothes and the hot air effect. It was confirmed through experiments that the angle was set to the optimum condition and that the position where the clothes uniformly hit the electrodes was optimal regardless of the amount and type of clothes.

FIG. 3 shows a dryness detection circuit equipped with the electrode 22, 23 is a relay, 24 is a delay circuit, 25 is an amplifier circuit, 26 is a door switch, 27 is a thermostat, 22
is an electrode, and 5 is a drive motor.

To explain the dryness detection operation in the above configuration, the rotary drum 2 is rotationally driven by the drive motor 5, and the hot air heated by the heater 17 is applied to the inner circumferential plate 11 constituting the front side of the rotary drum 2 by the rotation of the fan 4. It is supplied into the rotating drum 2 through the provided through hole 21, and
Dry the clothes inside.

The clothes in the rotating drum 2 are always in contact with the electrodes 22 while the rotating drum 2 is rotating, and while the clothes are wet, the electrodes 22 are in a conductive state, and the current amplified by the amplifier circuit 25 causes the relay to The closed state of 23 is maintained.

During this operation process, when hot air is supplied into the rotating drum 2 through the through hole 21 provided in the lower part of the inner circumferential plate 11 and exhausted outside the machine through the exhaust passage 28, the hot air inside the rotating drum 2 is Due to the relationship between the position of the through hole 21 and the exhaust direction, it is difficult to generate a flow of hot air in the upper part of the path, that is, in the vicinity of the clothes input port 13 of the rotating drum 2. In the air near the input port 13,
A force that tends to be drawn toward the exhaust flow side acts, and this causes negative pressure to be generated near the clothes input port 13.

Due to the generation of the negative pressure described above, the clothes in the rotary drum 2 tend to move near the clothes input port 13, that is, to the front side of the rotary drum 2, and as a result, the electrodes 22 are moved closer to the outer frame 1. Inner peripheral plate 1 fixed to the front part of
1, the clothes will surely come into contact with this electrode 22, and the accuracy of detecting dryness of the clothes will be significantly improved.

This effect is particularly effective when the amount of material to be dried is small.

Moreover, since the electrode 22 is provided on the inner surface of the lower part of the inner circumferential plate 11 at an offset position in the rotation direction of the rotary drum 2, the clothes that move and roll in the rotation direction when the rotary drum 2 rotates are , it is easy to make contact with the electrode 22, and the detection accuracy is improved.

As the clothes dry, the electrodes 22 become non-conductive.

In this case, after the electrodes 22 become non-conductive, the delay circuit 2
4 is activated to shut off the relay 23 after a certain period of time has passed, thereby preventing the clothes from being left undried.

Further, the electrode 22 is connected to an inner circumferential plate 1 fixed to the front surface of the main body 1.
1, the conventional slider is not required.

As described above, according to the present invention, the front part of the rotating drum is divided into an inner circumferential plate and an outer circumferential plate, and the inner circumferential plate has a through hole in its lower part for blowing hot air and a central part for inserting clothes. Each opening is formed and fixed to the front part of the outer frame, an outer circumferential plate is rotatably supported by the outer circumference of the fixed inner circumferential plate, and electrodes for detecting dryness of clothes are provided on the inner circumferential plate. When hot air is supplied into the rotating drum from the lower part of the inner peripheral plate on the front surface of the rotating drum and is exhausted outside the machine from the exhaust passage via the rear surface of the rotating drum, the upper part of the hot air path inside the rotating drum is ,
In other words, since the area near the clothes input port of the rotating drum becomes negative pressure, the clothes inside the rotating drum are attracted to the front side of the rotating drum.As a result, the clothes come into contact with the electrodes reliably, so that the clothes are removed. Dryness detection accuracy has been significantly improved,
In particular, by providing an electrode on the inner surface of the lower part of the inner circumferential plate offset in the direction of rotation of the rotating drum, when the rotating drum rotates, the clothes move in the drum in the direction of rotation and roll. , the contact between the electrode and clothing is extremely good, and even a small amount of material to be dried makes sure contact with the electrode.
Dryness can be detected accurately.

Furthermore, since the electrodes are attached to the inner circumferential plate fixed to the front surface of the main body, it is possible to provide a practical clothes dryer with dryness detection, which eliminates the need for a conventional slider.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a clothes dryer showing an embodiment of the present invention, FIG. 2 is a front view of the outer frame of the dryer, and FIG. 3 is a dryness detection circuit diagram of the dryer. 1... Outer frame, 2... Rotating drum, 11
...Inner circumference plate, 12...Outer circumference plate, 13.
...Clothing slot, 21...Through hole, 22.
·····electrode.

Claims (1)

[Scope of utility model registration request] A rotary drum is rotatably provided within the outer frame, and hot air is supplied into the rotary drum from the front and exhausted from the rear to dry the clothes inside the rotary drum. It is divided into an inner circumferential plate and an outer circumferential plate, and the inner circumferential plate has a through hole for hot air flowing through the person in its lower part and a clothing slot in its central part, and is fixed to the front part of the outer frame,
The outer circumferential plate is rotatably supported by the outer circumference of the fixed inner circumferential plate, and electrodes are provided on the inner surface of the lower part of the inner circumferential plate to detect the degree of dryness of the clothes by being offset in the rotational direction of the rotating drum. Clothes dryer equipped with dryness detection.