JP2880022B2 - 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 drum type clothes dryer, and more particularly, to a dehumidification type drum having a rotatable drum for storing clothes and a double-blade fan for both a blower and a heat exchanger. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clothes dryer, and relates to a configuration for reducing damage to cloths of clothes during delicate drying.

[0002]

2. Description of the Related Art In general, when drying clothes using a drum-type clothes dryer, if the repeated operation (tumbling) of lifting the clothes by rotating the drum and dropping the clothes by its own weight is continued for a long time, the clothes may be damaged. It tends to occur easily. In order to cope with this problem, a method has been conventionally considered in which the rotation of the drum is stopped for a certain period of time during the drying operation to reduce the mechanical force applied to the clothes during tumbling.

[0003] That is, conventionally, there has been proposed a method of drying while alternately rotating and stopping the rotation of the drum at regular intervals regardless of the humidity and temperature in the drum. An example of controlling the intermittent rotation of the drum temporally and controlling the intermittent rotation is disclosed in Japanese Patent Publication No. 63-78. Further, as an object for the purpose of reducing the damage to the cloth, one disclosed in JP-A-63-95100 can be mentioned. There is proposed a method in which the drum rotates when the temperature in the drum exceeds a predetermined value, and stops when the temperature drops by a certain value.

[0004]

The clothes dryer disclosed in Japanese Patent Publication No. 63-78 proposes a method of intermittently rotating a drum. However, this clothes dryer aims at uniform irradiation of a germicidal lamp provided for drying clothes, and a method of reducing mechanical force by tumbling to prevent damage to the cloth and the temperature inside the drum. There has not been enough study on stabilization of the

On the other hand, in the clothes dryer disclosed in JP-A-63-95100, an improvement has been made to intermittently control the rotation of the drum in order to reduce damage to the cloth. However, since there is no control such as input switching of the drying heater, the temperature in the drum rises quickly when drying small-volume clothes. Then, the time difference between the rotation and the stop of the drum becomes small, and the effect of reducing the damage to the cloth is small.

[0006] As described above, although studies have been made to reduce the damage to clothes caused by intermittent tumbling, delicate (drying) of fashionable clothes made of synthetic fibers, sweaters made of wool, blouses made of silk, and the like has been performed. It has been difficult to dry clothes (sometimes requiring special care) without compromising its hand.

In particular, these delicate garments are rarely dried by being mixed with cotton underwear and the like, and are often dried alone. Strength increases. And
When the stop time of the drum is short, problems such as the effect of intermittent tumbling are difficult to be obtained and the contact between the warm air and the clothes is deteriorated.

[0008]

SUMMARY OF THE INVENTION The present invention provides a rotatable drum for storing clothes to be dried, a fan having a function of circulating hot air and dehumidifying and cooling, and a drum and a fan which are independent of each other. In a drum-type clothes dryer having a driving device for driving the drum, a reversing device for rotating the drum in both forward and reverse directions, and a duct serving as a path of circulation hot air, a plurality of drying heaters are provided in the duct. It is located at both high and low positions, and during the drying tumbling operation, the drum is intermittently rotated for a predetermined time and the drum is stopped.
Sometimes only the heater at the low position is ON controlled,
Are substantially half the input of the total heat capacity of the heater disposed in the location, a drum-type clothes dryer, characterized in that it has an intermittent tumbling course.

That is, in the drum-type clothes dryer of the present invention, a plurality of clothes-drying heaters are arranged at both the upper and lower positions, and the rotation of the drum is reduced in order to stably reduce the mechanical force applied to the clothes by tumbling. A predetermined rotation time and stop time are set and controlled in order to alternately perform the stop and the stop, and when the rotation of the drum is stopped, only the heater (lower half) disposed at a low position is turned on. Accordingly, the gist of the present invention is to reduce hot air that does not come into contact with clothing and to suppress a rapid rise in the temperature in the drum.

When a small amount of delicate clothes is dried by the drum-type clothes dryer of the present invention, it is preferable to control the rotation time of the drum to be not more than one fifth of the stop time.

In the case of a small amount of drying during intermittent tumbling, since the contact between the warm air and the clothes deteriorates and the drying efficiency decreases, the drum is rotated in the opposite direction so that the clothes fall in front of the drying heater. Is preferably controlled.

Furthermore, the amount of delicate clothes to be dried comes the drying time is prolonged somewhat more, only while the drum is rotating, dry <br/> disposed high and low position It is preferable to control so that the drying heater is input.

According to the drum type clothes dryer of the present invention, when the temperature in the drum exceeds a predetermined value at the end of drying, the drum continuously moves in the forward direction in order to prevent wrinkles of the clothes at the end of drying. It is preferable to control the rotation.

[0014]

When the rotation and the stop of the drum are alternately performed, the rotation time of the drum during the drying operation is shortened. Therefore, the mechanical force due to the tumbling is greatly reduced, and the cloth damage to the clothing is reduced. As a result, delicate garments that have been difficult to dry with a conventional drum-type clothes dryer can be dried well.

By controlling one of the plurality of drying heaters to turn on the input, a rapid rise in the temperature inside the drum is prevented, and damage to the cloth due to high temperatures can be prevented.

In the case of a small amount of drying, by controlling the drum to rotate in the reverse direction so that the clothes fall in front of the heater in the drum when the drum is stopped, good contact between the clothes and the warm air is maintained.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to this.

FIG. 1 shows a sectional structure of a drum type clothes dryer according to the present invention. A drum 1 for storing clothes to be dried has a drum shaft 4 whose one (rear) side is horizontal.
, And the other (front) side is rotatably supported by the support plate 3. On the side wall surface on the rear side of the drum 1, a lint filter 6 and a filter guard 5 are provided before the exhaust port 7. 1
Reference numeral 7 denotes a tumbling drum baffle fixed to the inner surface of the peripheral wall of the drum 1.

Behind the drum 1, a two-blade fan 8, which serves as a blower for circulating warm air and a heat exchanger for cooling and dehumidifying, is rotatably provided on the horizontal drum shaft 4. The drum 1 can be rotated in both forward and reverse directions by a drum driving motor 19 via a drum belt 16. On the other hand, the two-wing fan 8 is rotated independently of the drum 1 by a fan driving motor 18 via a fan belt 15.

Reference numeral 10 denotes a duct for circulating warm air. Reference numeral 11 denotes a clothes drying heater provided in the duct 10,
Generally, a PTC (semiconductor) heater is used. As shown by a broken line in FIG. 2, the heater 11 is provided divided into two (11a and 11b) of a high position and a low position. These heaters 11a and 11b are controlled independently.

Reference numeral 2 denotes a hot air outlet provided in the support plate 3. Reference numeral 12 denotes a drain port provided at the lowest position of the duct 10. 13 and 14 are thermistors provided in the hot air circulation path. That is, thermistor 1
3 is behind the exhaust port 7, and the thermistors 14 are 11a and 11
b. These thermistors 13 and 14 are used for detecting the end of drying, detecting abnormal temperature rise, and the like. Reference numeral 21 denotes a thermistor attached near the suction port on the cooling side of the two-wing fan 8, and detects an outside air temperature such as an indoor temperature in a room where the drum-type clothes dryer is installed.

Hereinafter, the operation of the drum type clothes dryer will be described. When the two-wing fan 8 rotates, the air flows in the direction indicated by the arrow A.
Flows in the direction of That is, after the air flows from the rear side to the front side through the duct 10, the air is heated by the heater 11 to become hot air, and is blown into the drum 1 from the hot air outlet 2. The warm air blown into the drum 1 comes into contact with the clothes inside, and the lint filter 6 and the exhaust port 7 contain a large amount of moisture.
And returns to the two-sided fan 8 again.

On the surface on the opposite side (rear side) of the two-wing fan 8, as shown by an arrow B, cold outside air is taken into the inside of the machine and discharged again outside the machine to flow in the direction of A. Cools hot and humid hot air to dehumidify. The water condensed at this time is discharged to the drain port 12 below the duct 10.
From the aircraft.

On the other hand, the drum 1 has a low speed (40 to 60 rpm).
m). Then, a cycle (tumbling) in which the clothes are lifted upward by the centrifugal force due to the rotation of the drum 1 and the action of the drum baffle 17 and fall under their own weight is repeated. Thereby, the clothing keeps good contact with the warm air. By repeating the above, the clothes in the drum 1 are dried.

Two thermistors 13 for detecting hot air temperature
When the temperature difference of 14 becomes equal to or more than the set value, it is determined that the drying is completed, and the operation is controlled so as to stop. If the temperature detected by the thermistor 13 exceeds a certain value, it is determined that the temperature inside the drum 1 is too high, and the heaters 11a and 1
Control is also performed so as to cut any one of 1b and lower the temperature inside the drum 1.

Next, control of the drum 1 and the drying heater 11 will be described. In the standard drying (non-delicate drying) course, the drum 1 rotates continuously in the forward direction (clockwise direction in FIG. 2) or alternately repeats the forward and reverse rotations. Controlled. At this time, the drying heater 11 is basically controlled so as to receive all inputs. However, "weak" with the heater switch
Is selected, control is performed so that one of the heaters 11a and 11b is turned on.

On the other hand, when the delicate drying course is selected, as shown in FIG.
Is controlled according to the timing chart of FIG. That is, the drum 1 rotates in the reverse direction for 10 seconds, and then stops for 300 seconds,
Next, control is performed such that the operation of rotating in the same direction for 10 seconds is repeated. At the same time, the drying heater 11 receives all inputs. When the drum 1 stops, the heater 11 in the low position
a holds the ON state, and the heater 11b at the high position
Becomes OFF. When the drum 1 rotates again, the heater 11b at the high position is controlled to be turned on. During this time, the two-wing fan 8 is continuously rotating.

If the rotation speed of the drum 1 is set to 45 to 68 rpm when the diameter of the drum 1 is about 600 mm, the clothes are tumbled so as to fall near the heater 11a as shown in FIG. In the stopped state, the warm air hits the clothes well. Therefore, it is possible to prevent a decrease in drying efficiency, which occurs when the hot air is discharged without coming into contact with the clothes, and a sensing failure due to a rapid rise in the temperature of the hot air discharged from the drum 1. Also,
If the detected temperature of the thermistor 13 exceeds the set value at the end of drying, the rotation of the drum 1 can be continuously rotated in the positive direction to prevent wrinkling of clothes at the end of drying.

In the delicate drying course, since the rotation time of the drum 1 during the drying operation is shorter than that in the standard drying course, the mechanical force applied to the clothes is greatly reduced, and the damage to the cloth is significantly reduced. In an evaluation test using a sweater made of 100% wool, the shrinkage rate of the sweater in the delicate dry course is 15% or less compared to 35% or more of the standard dry course. This is hand washing
It is the same value as the case of the shade. From this evaluation test, it can be seen that according to this drum-type clothes dryer, it is possible to dry delicate clothes such as fashionable clothes of synthetic fibers, sweaters of wool, and blouses of silk without impairing the feeling of the clothes. .

Further, by controlling the input of the drying heater 11, an abnormal rise in temperature of the clothes can be suppressed, and the clothes can be prevented from being damaged by high-temperature hot air. Further, the contact between the warm air and the clothes is good, and waste is eliminated, so that good drying can be performed without lowering the drying efficiency.
In addition, since the drum 1 is controlled to be continuously rotated at the end of drying, wrinkles at the end of drying can be prevented.

[0031]

According to the drum type clothes dryer of the present invention,
It becomes possible to dry delicate clothes such as synthetic clothes, wool sweaters, silk blouses, etc. without impairing the feeling.

[Brief description of the drawings]

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

FIG. 2 is an explanatory diagram of the internal configuration of a drum viewed from the front of the drum-type clothes dryer.

FIG. 3 is a timing chart showing an example of a control method of a drum and a heater for drying in the drum type clothes dryer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drum 4 Drum shaft 8 Two-wing fan 10 Duct 11 (11a / 11b) Drying heater 17 Drum baffle 18 Fan drive motor 19 Drum drive motor

──────────────────────────────────────────────────続 き Continued on the front page (72) Noriaki Miyoshi, Inventor 22-22, Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Inside Sharp Corporation (72) Inventor Kazutoshi 22-22, Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Sharp shares Inside the company (72) Inventor Yuji Onishi 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Inside Sharp Corporation (72) Inventor Minoru Tatana 22-22, Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Inside Sharp Corporation (56) Reference Reference JP-A-63-95100 (JP, A) JP-A-4-56496 (JP, U) JP-A-1-168297 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) D06F 58/02 D06F 58/28

Claims (5)

(57) [Claims] 1. A rotatable drum for storing clothes to be dried, a fan having a function of circulating hot air and dehumidifying cooling, and a driving device for driving the drum and the fan independently of each other; In a drum-type clothes dryer including a reversing device for rotating a drum in both forward and reverse directions and a duct serving as a path of hot air for circulation, a plurality of drying heaters are arranged in both upper and lower positions in the duct. During the drying tumbling operation, the drum is intermittently rotated for a predetermined period of time, and only the heater at the low position when the drum is stopped is controlled to be ON , so that the heat disposed at both the high and low positions. are substantially half the input of the total heat capacity of the motor, the drum type clothes dryer, characterized in that it has an intermittent tumbling course. 2. The drum-type clothes dryer according to claim 1, wherein the rotation time of the drum in the intermittent tumbling course is controlled to be one fifth or less of the stop time. 3. The drum-type clothes dryer according to claim 1, wherein the drum is controlled to rotate in the reverse direction in the intermittent tumbling course. 4. A plurality of drying heaters are provided in two parts, and during the rotation of the drum in the intermittent tumbling course,
The drum-type clothes dryer according to claim 1, wherein the heaters disposed at both the high and low positions are controlled to be turned on. 5. The drum-type clothes dryer according to claim 1, wherein the drum-type clothes dryer is controlled to continuously rotate in a forward direction when the temperature in the drum exceeds a predetermined value.