JPH04152994A - Controller for clothes drier - Google Patents

Abstract

PURPOSE:To exactly detect the clogging of a filter by informing a fact of abnormality by an informing means, when a temperature excessive rise preventing means is operated plural times in the course of operation. CONSTITUTION:A microcomputer 15 monitors a machine temperature by a thermostat 8, and if normal (turn-on state), a drying operation is executed continuously. In this case, when the machine temperature rises abnormally, and the thermostat 8 becomes a turn-off state, an air blasting operation is executed for 30 seconds. By this air blasting operation, only the motor 2 is energized and a fan 3 and a drum 4 are driven, air is allowed to circulate in the machine and the inside of the machine is cooled. Subsequently, the energizing of the motor 2 is also stopped for five seconds, the fan 3 and the drum 4 are stopped, and also, by executing the air blasting operation again for one minute and 30 seconds, the temperature of an object to be dried is lowered enough. Next, unless the thermostat 8 is reset, it is judged to be an abnormal temperature rise in the machine generated by other cause than clogging of a filter 10, and an informing means 14 is operated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a control device for a clothes dryer that dries clothes using hot air from a heater or burner.

BACKGROUND OF THE INVENTION Conventionally, a control device for a clothes dryer of this type immediately stops operation and issues an abnormality alarm when it detects an abnormal temperature rise inside the machine due to a clogged filter in the drum or the like.

Problems to be Solved by the Invention However, with this conventional configuration, when a small amount of synthetic fiber such as a cutter shirt is dried, it sticks to the filter in the drum, reducing the amount of air circulating inside the machine. As a result, there was a problem in that the temperature inside the aircraft rose abnormally, resulting in an abnormality notification.

In view of the above problems, it is an object of the present invention to accurately detect clogging of a filter without malfunctioning even when a single cutter shirt is dried.

Means for Solving the Issues In order to solve the above issues, the present invention provides an over-temperature rise prevention means that operates when an abnormal temperature rise inside the aircraft is detected, a notification means for notifying an abnormal state, and a means for preventing the above-mentioned temperature rise. A control means that inputs the state of the prevention means and controls a heat source, a motor serving as a drive source, and the notification means? A first means for solving the problem is that the control means notifies the notification means of an abnormality when the temperature overrise prevention means operates a plurality of times during operation.

Further, in the first problem solving means, the control means:
When the temperature overrise prevention means operates for the first time during operation, the air blowing operation is performed for a predetermined period of time, and then the air blowing operation is stopped for a predetermined period of time.

Furthermore, in the first problem-solving means, the control means, when the first overtemperature rise prevention means operates during operation,
After performing ventilation operation for a predetermined time, it is stopped for a predetermined time,
The third problem-solving means is to notify the abnormality of υ using the notification means when the overtemperature rise prevention means does not recover even after a predetermined period of time has elapsed after the air blowing operation is performed again.

Effect: According to the first problem-solving means, an abnormality is notified when the temperature overrise prevention means operates multiple times, so even if a cutter shirt sticks to the filter in the drum once, it will not malfunction. .

Further, according to the second problem solving means, by stopping the air blowing operation for a predetermined period of time, it is possible to remove cutter shirts and the like stuck to the filter in the drum.
malfunction? It can be prevented.

Furthermore, according to the third problem-solving means, an abnormality is notified when the overtemperature rise prevention means does not recover even after performing air blowing operation for a predetermined period of time, so filter clogging can be detected at an early stage. , or abnormal temperature rises due to causes other than filter clogging can be detected.

Example Hereinafter, one example of the present invention will be explained.
I will refer to and explain. FIG. 3 is a longitudinal sectional view of a clothes dryer according to an embodiment of the present invention, in which a motor 2 serving as a driving source is provided at the bottom of the main body 1, and a fan is provided on the back side of the main body 1 together with the motor 2. Belts 5 and 6 are stretched between the fan 3 and a rotary drum 4 provided in front of the fan 3, respectively, so that the fan 3 and the rotary drum 4 are rotated by the drive of the motor 2. Further, a heater 7 serving as a heat source is disposed on the front example 1 of the main body 1, and hot air heated through the heater γ by the rotation of the fan 3 is introduced into the rotating drum 4 and is housed in the rotating drum 4. The item to be dried (clothing) is heated and dried. Note that arrow A in the figure indicates the flow of wind. Further, 8 is a thermostat which is a means for preventing excessive temperature rise and is turned off when an abnormal temperature t in the cabin is detected. Reference numeral 9 is an electrode, which is brought into contact with the material to be dried in the rotating drum 4 during operation. Reference numeral 10 denotes a buoy letter for collecting the textile debris in the exhaust gas. When the filter 10 becomes clogged due to accumulation of textile debris, the door 11 is opened and the filter 10 is removed from the drum 4 to remove the textile debris. The structure is such that it can be attached to the drum 4 again after being removed. The abnormal temperature rise inside the machine detected by the thermostat 8 is mainly caused by the decrease in the amount of air circulating inside the machine due to the aforementioned clogging of the filter 1o. Therefore, by removing the scum from the filter 1o, the abnormal temperature rise inside the aircraft can be eliminated.

Next, FIG. 1 is a block diagram of a control device according to an embodiment of the present invention, in which a control means 10 consisting of a microcomputer is shown.
operates according to a pre-programmed procedure while inputting the state of the thermostat 8 and detecting the degree of dryness of the object to be dried via the resistance detection means 12 for detecting the electrical resistance value of the electrode 9. The microcomputer 1o controls the operation of the motor 2 and the heater through the load drive means 13i, and informs the user of the operating state and abnormal state by means of a notification means 14 comprising a light emitting diode, a buzzer, etc.

The operation of the clothes dryer control device having the above configuration will be explained below with reference to the flowchart shown in FIG. The microcomputer 15 sets the initial value of the variable N to 0 in step 100, monitors the temperature inside the machine using the thermostat 8 in step 101, and continues drying operation if the temperature is normal (on state). When the temperature inside the machine rises abnormally, that is, when the thermostat 8 turns off, only the stem is energized and the fan 3 and drum 4 are driven to circulate air within the machine, thereby cooling the machine interior.

During this time, the temperature of the material to be dried, which has risen to an abnormal temperature, is temporarily lowered. Then, in step 104, motor 2
By stopping the power supply to the fan 3 and the drum 4, even if the cutter shirt or the like gets stuck to the filter and the thermostand 8 is turned off. , you can get rid of it.

Further, in step 105, the air blowing operation is performed again for 1 minute and 30 seconds to sufficiently lower the temperature of the material to be dried.

Daughter lv2 at step 103 and step 105
Even if the filter 10 is actually clogged after several minutes of air blowing operation, the thermostat 8 is designed to recover, so in step 106,
If thermostat 8 has not reset, filter 1
It is determined that the abnormal temperature rise inside the machine is due to a cause other than the clogging, and the process goes to step 108, where the notification means 14 is operated to notify the user of the abnormal temperature rise. If the thermostat 8 has returned, go to step 107.
It is determined whether N=2, that is, whether or not the thermostat 8 has operated for the second time.

If it is the second time, the process goes to step 10B and the notification means 14 is activated to notify the user of the abnormal temperature rise.

This is an operation to notify the user that the filter 10i in the drum 4 needs to be cleaned. Also, if thermostat 8 is working for the first time, step 1
Return to 01, perform normal drying operation, and turn off the thermostat.
-8 to monitor cabin temperature.

In this embodiment, an electric clothes dryer in which the heat source is a heater has been described, but the same effect can be obtained in a gas clothes dryer in which the heat source is Ganubhana.

Effects of the Invention As is clear from the embodiments described above, according to the present invention, an abnormality is notified when the thermostand operates multiple times.
Even if the cutter shirt gets stuck to the filter inside the drum, it will no longer cause a malfunction that would alert you to an abnormality.

Also, by providing a stop period during ventilation operation.

It is possible to remove stuff such as canter shirts stuck to the filter inside the drum.

Furthermore, an abnormality is notified when the thermostat does not return even after performing the predetermined air blowing operation, so filter clogging can be detected early, or is the abnormal temperature rising due to a cause other than filter clogging?
It can be detected and notified to the user, making it possible to realize a safe clothes dryer.

[Brief explanation of the drawing]

Fig. 1 (d) is a block diagram of a control device for a clothes dryer showing an embodiment of the present invention, and Fig. 2 is a flowchart 1-1 showing the control contents of the control device for the clothes dryer. is a sectional view of the clothes dryer. 8...Thermostat (temperature overrise prevention means). 10... Filter 14... Notification means, 1
6...Microcomputer. Name of agent: Patent attorney Akira Okaji and two others

Claims (2)

[Claims] (1) A temperature rise prevention means that operates when an abnormal temperature rise inside the machine is detected, a notification means that notifies an abnormal state, and the state of the temperature rise prevention means is input, and the heat source and the motor serving as the drive source are connected. control means for controlling the notification means, wherein the control means is configured to notify of an abnormality by the notification means when the temperature overrise prevention means operates a plurality of times during operation. Device. (2) The control device for a clothes dryer according to claim 1, wherein the control means performs the air blowing operation for a predetermined time and then stops the operation for a predetermined time when the temperature overrise prevention means operates for the first time during operation. (2) When the overtemperature rise prevention means operates for the first time during operation, the control means performs the blowing operation for a predetermined period of time, stops the operation for a predetermined period of time, performs the blowing operation again, and even if the predetermined period of time elapses. 2. The control device for a clothes dryer according to claim 1, wherein when the overtemperature rise prevention means does not recover, the notification means notifies the user of the abnormality.