JPH0274300A - Clothes dryer - Google Patents

Abstract

PURPOSE:To avoid the problem of spontaneous combustion for using a dryer with safety by rotating a drum when a temperature higher than the specified one is detected while the drum is stopped after operation. CONSTITUTION:A drum 4 that contains clothes to be dried is rotated and hot air is supplied in it. A temperature sensor 20 that detects the temperature of drying clothes is furnished in the drum. A rotation controller 20 is provided to rotate the drum 4 when a temperature higher than the specified one is detected even while the drum is stopped after operation. As a result, when clothes are left in heaps on the bottom of the drum 4 and the temperature of clothes rises above the specified temperature, the drum 4 is rotated. Thereby, the temperature of clothes is lowered avoiding spontaneous combustion.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a so-called drum-type clothes dryer.

(Prior Art) Conventionally, this type of drum-type clothes dryer includes a drum that houses clothes to be dried and is driven to rotate, and hot air is supplied to the inside of this drum to dry the clothes to be dried. I try to let them do it.

(Problems to be Solved by the Invention) In the clothes dryer as described above, the clothes are left piled at the bottom of the drum unless the clothes are taken out after the end of operation.

When left unattended, abnormal heat is generated inside the pile of clothes, and the temperature reaches as high as 80['C]. This problem also occurs when clothes that have been dried in the sun are simply piled up and left to dry without using a dryer, and oils such as tempura oil may adhere to clothes that generate abnormal heat. If there was any residue that could not be removed by washing, there was a risk that it would spontaneously ignite and become a source of fire.

The present invention has been made in view of the above-mentioned circumstances, and therefore, its purpose is to prevent the problem of spontaneous ignition and to provide safety even when clothes with oil on them are not taken out after the end of operation. To provide an excellent clothes dryer that can be used for

[Structure of the Invention] (Means for Solving the Problems) The clothes dryer of the present invention is arranged so that the clothes to be dried are placed facing the inside of a drum that accommodates the clothes to be dried and is driven to rotate and to which hot air is supplied. A temperature sensor for detecting temperature is provided, and rotation control means is provided for rotating the drum when the temperature sensor detects a temperature equal to or higher than a set value when the drum has stopped rotating after the end of operation. It is something that shows its characteristics in certain places.

(Operation) According to the above means, if the temperature of the clothes rises above a certain level in a situation where the clothes are left in a pile at the bottom of the drum, the drum is rotated at that point. Therefore, the temperature of the clothing can be lowered and spontaneous combustion can be avoided.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

First, in FIG. 2 showing the overall configuration, reference numeral 1 denotes an outer box, which has an entrance/exit 2 for drying material formed on its front surface, and a door 3 for opening/closing the entrance/exit 2. 4 is a drum whose front side is fitted and supported by an annular support portion 5 provided on the outer box 1;
It is rotatably provided within the outer box 1 by fitting and supporting the rear side of the casing 6 fixedly disposed within the outer box 1. 7 is a double-blade fan that also serves as a heat exchanger.
The inside of the casing 6 is partitioned into an exhaust gas introduction chamber 8 on the front side and an outside air introduction chamber 9 on the rear side, and is rotatably supported by a support 10. A heater case 11 is provided so as to communicate from the exhaust gas introduction chamber 8 into the drum 4, and is provided with a heater 12 made of, for example, a PTC heater. Reference numeral 13 denotes a motor disposed at the bottom of the outer box 1. This motor 13 rotationally drives the fan 7 via a belt transmission mechanism 15 mainly including a belt 14, and also rotates the fan 7 via a belt transmission mechanism 15 that mainly includes a belt 14.
The drum 4 is rotationally driven through the. 1
Reference numeral 7 denotes an exhaust port formed in the casing 6. When the fan 7 is driven to rotate, the air inside the drum 4 is discharged from the exhaust port 17 into the exhaust introduction chamber 8, as shown by the arrow in the figure. The exhaust gas is returned from the exhaust introduction chamber 8 to the drum 4 through the heater 12 and circulated. However, the air thus circulated is heated and turned into hot air when it passes through the heater 12, and the hot air is therefore supplied into the drum 4. On the other hand, on the back side of the outer box 1, an outside air intake port 18 is formed which communicates with a portion near the center of the outside air introduction chamber 9, and an outside air outlet 19 is formed which communicates with a portion near the periphery of the outside air introduction chamber 9. When the fan 7 is driven to rotate, air outside the outer box 1 is sucked into the outside air introduction chamber 9 through the outside air intake port 18, and then exhausted to the outside of the machine through the outside air outlet 19. In this way, heat is exchanged between the air inside the drum 4 and the outside air via the fan, and the air inside the drum 4 is dehumidified, in other words, significant moisture is removed from the material to be dried.

Reference numeral 20 denotes a temperature sensor disposed on the lower front part of the casing 6 so as to face the inside of the drum 4. The temperature sensor 20 is made of, for example, a heat wire sensor, and measures the temperature of clothes to be dried (not shown) housed in the drum 4 by direct contact with the temperature sensor 20. It can be detected without any problem.

Reference numeral 21 denotes a dryness sensor disposed at the upper front of the casing 6 so as to face the inside of the rotating drum 4. This sensor is equipped with a pair of electrodes, and measures the resistance value of the object to be dried that is in contact with the pair of electrodes. It is designed to output a detection signal indicating.

Next, in FIG. 3 showing the electrical configuration, 22 is a power switch, 23 is a power circuit that is driven when the power switch 22 is turned on, and the heater 12 and motor 13
is adapted to be directly energized from this power supply circuit 23. Reference numeral 24 denotes a rectifier circuit for rectifying and smoothing the output of the power supply circuit 23, and the rectifier circuit 24 supplies power to an operation control circuit 25, which is a rotation control means.

The operation control circuit 25 is composed of a microcomputer, and receives a start signal from a start switch 26, and receives an open door detection signal and a closed door detection signal from a door switch 27 that responds to the opening and closing of the layer 3. It receives a clock pulse from the clock pulse generation circuit 28, a temperature detection signal from the temperature sensor 20, and a dryness detection signal from the dryness sensor 21 as inputs, and these input signals and the pre-stored The energization state of the heater 12 and motor 13 is controlled via a drive circuit 29 based on a control program.

Therefore, the outline of the control content by the operation control circuit 25 and the related effects will be explained below with reference to FIG. 1.

That is, when the power is turned on by the power switch 22, the operation control circuit 25 first performs an initialization operation and then waits until the start switch 26 is turned on.
Step St, S2). And start switch 26
When the heater 1 is turned on, the heater 1 is
2 and the motor 13 (step S3). As a result, the motor 13 rotates the drum 4 and the fan 7, and the heater 12 generates heat, thus starting the operation, especially the hot air drying process.

However, after this, the dryness detection signal of the dryness sensor 21 is read, and it is determined whether the dryness of the clothes to be dried in the drum 4, which is indicated by the dryness detection signal, has reached the operation end value. Step S4. S5), when the degree of dryness reaches the operation end value, the power supply to the heater 12 is terminated (step 5 (i). Therefore, in response to such a power outage of the heater 12, the operation changes from the hot air drying process to the cold air drying process. Then, the operation control circuit 25 reads the temperature detection signal of the temperature sensor 21, and determines whether the temperature of the clothes to be dried in the drum 4, which is indicated by the temperature detection signal, is below the set value in this case. Steps S7 and S8) determine whether the motor 13 has descended to the set value or not, and when it is determined that the motor has descended below the set value, the energization to the motor 13 is terminated (step S9). As a result, the cold air drying process is completed and the operation of the dryer is ended. It should be noted that during this drying completion operation, a configuration may be adopted in which a buzzer or the like is used to notify that fact.

Next, the operation control circuit 25 determines whether or not the power switch 22 is turned off (step S10), and when the power switch 22 is turned off, it assumes that the clothes to be dried have been taken out from the drum 4 and starts operating. However, if the drying process is not turned off, it is assumed that the clothes to be dried are not taken out from the drum 4 and the operation continues. While this operation continues (after the dryer has finished operating and the drum 4 has stopped rotating), the temperature detection signal of the temperature sensor 21 is read, and the inside of the drum 4 indicated by the temperature detection signal is read. In this case, the temperature of the clothes to be dried is set to 6, for example.
0["It is determined whether or not the value has increased to 01 or higher (step S, 312). If the value has not risen to the set value or higher, the process returns to step SIO and waits for the power switch 22 to be turned off. is completed, but when the value rises to the set value or more, the motor 13 is energized (step S1
3). Therefore, the drum 4 and the fan 7 are driven to rotate, and the same operation as in the cold air drying process described above is performed to cool the clothes to be dried in the drum 4. Therefore, even if there is oil such as oil on the drying clothes that cannot be removed by washing, the temperature will be lowered, so it will never spontaneously combust like in the past. , can eliminate the risk of fire. Note that the operation at this time may be performed simply by rotating the drum 4 without blowing air by rotating the fan 7. In other words, in order to lower the temperature of the clothes, the drum 4 may be rotated. It alone has sufficient effect.

Moreover, after the above-mentioned cooling operation is started, the process returns to step S7, and therefore, when the temperature of the clothes to be dried in the drum 4, which is indicated by the temperature detection signal of the temperature sensor 21, falls below the set value, the motor 13 The operation is terminated after the power supply is terminated, and the operation is terminated after waiting for the power switch 22 to be turned off.

[Effects of the Invention] As is clear from the above description, according to the clothes dryer of the present invention, the temperature of the clothes can be kept constant even when the clothes are left stacked at the bottom of the drum. When the temperature rises above this point, the drum is rotated, which lowers the temperature of the clothing and prevents spontaneous combustion, which is an excellent effect that makes it safe to use. It is something that plays.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a flowchart for explaining functions.・FIG. 2 is a vertical sectional side view of the overall configuration, and FIG. 3 is a block diagram of the electrical configuration. In the drawing, 4 is a drum, 7 is a fan, 12 is a heater, 13
20 is a temperature sensor, and 25 is an operation control circuit (rotation control means).

Claims (1)

[Claims] 1. A drum that accommodates clothes to be dried and is driven to rotate, and is configured to supply hot air to the inside of this drum to dry the clothes to be dried. The drum is equipped with a temperature sensor that detects the temperature of the clothes to be dried, and when the drum stops rotating after the end of operation and the temperature sensor detects a temperature equal to or higher than a set value, the drum is stopped. A clothes dryer characterized by comprising a rotation control means for rotating the clothes dryer.