JP2532465B2 - Clothes dryer control device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clothes dryer control device that detects temperatures of intake air and exhaust air in a drying chamber and automatically stops drying by utilizing the temperature difference. is there.

2. Description of the Related Art Conventionally, a control device for this type of clothes dryer has been disclosed in Japanese Patent Laid-Open No. 58-
It had the structure shown in the 198398 publication.

That is, a thermistor that detects the temperature of the intake side and the exhaust side of the drying chamber is provided, the temperature difference between the intake side and the exhaust side is detected by the signal from the thermistor, and when the temperature difference reaches a predetermined value or more, the timer counts. Was operated and the operation was stopped after the set time. The temperature difference increases as the degree of dryness increases, and after reaching a predetermined degree of dryness, the degree of dryness can be set by controlling the time by a timer.

Problems to be Solved by the Invention However, in the conventional configuration, when the thermistor fails,
There is a problem that the temperature difference due to the signal from the thermistor does not reach a predetermined value or more, so that the timer does not perform the time counting operation and the drying operation does not end.

In view of the above problems, it is an object of the present invention to provide a clothes dryer control device capable of reliably ending the drying operation even when the temperature detecting means such as the thermistor fails.

Means for Solving the Problems In order to achieve the above object, a control device for a clothes dryer according to the present invention is a temperature detecting means for detecting intake and exhaust temperatures of a drying chamber for storing clothes dried by hot air, and The temperature detection means detects the temperature difference between the intake air and the exhaust gas, and starts the timer timing operation when the temperature difference reaches a predetermined value and when an abnormality that occurs in the temperature detection means or the device is detected. The temperature difference detecting means for ending the drying when the time measured by the timer reaches a predetermined time is provided.

Action With the above configuration, when the temperature detecting means or the device is normal, the timer starts the time counting operation when the temperature difference reaches the predetermined value or more, and stops the operation after the predetermined time. Further, even when the temperature detecting means or the equipment is abnormal, the timer can start the time counting operation, and the operation can be stopped without fail after a predetermined time.

Practical Examples An embodiment of the present invention will be described below with reference to FIGS.

The configuration of the control device for the clothes dryer in this embodiment is the first
As shown in the figure, the temperature detection means 3 and 4 detect the temperatures of the intake side and the exhaust side of the drying chamber where the hot air is introduced to dry the clothes, and the detection signals are output to the temperature difference detection means 12. Has been done. The temperature difference detecting means 12 detects the difference between the intake air temperature and the exhaust gas temperature, and starts the time counting operation of the timer 5 when the temperature difference reaches or exceeds a predetermined value. The timer 5 controls the energization of the heater 1 and the motor 2 that generate hot air, and opens the contact 13 between the heater 1 and the motor 2 and the AC power supply 11 for a predetermined time to stop the drying operation.

Next, the abnormality detecting means of the temperature difference detecting means 12 will be described with reference to FIG. That is, the temperature detecting means (thermistor) 3
Alternatively, the DC voltage V _CC is applied to the series body of the resistor 7 and the series body of the resistors 8 and 9 at 4 and the midpoints a and b of the respective series bodies are applied.
The voltage of is input to the comparator 10.

In the above configuration, the operation will be described. The clothes in the drying chamber are agitated by the heater 1 and the motor 2 and are dried by hot air. At this time, the temperature difference detecting means 12 activates the timer 5 when the temperature difference exceeds a predetermined value if the temperature difference shows a normal state as shown in FIG. However, if an abnormal phenomenon as shown in Fig. 3b is shown, or if a failure occurs in the temperature detecting means 3, 4, etc.,
The comparator 10 compares the reference voltage b (divided voltage composed of the resistors 9 and 10) with the divided voltage a of the thermistor 6 and the reference resistor 7 to detect an abnormality in the temperature detecting means. Further, the abnormality of the equipment is detected by analyzing the abnormal temperature curve as shown in FIG. 3B (for example, whether the temperature difference after a lapse of a certain time after the start of the drying operation is a certain value or more). In this case, the timer operation is forcibly started so that the drying operation is finished early.

EFFECTS OF THE INVENTION As is apparent from the above-described embodiments, according to the present invention, even if an abnormality occurs in the clothes dryer and the data such as the temperature detection is incorrect, the drying operation is always ended, so that the loss of the dried clothes is prevented. It is also excellent in terms of device safety. Also,
Since the timer operates even when an abnormality is detected, it is possible to return to normal drying completion without immediately ending drying if an abnormality is detected by mistake, and improve the reliability of false detection. it can.

[Brief description of drawings]

FIG. 1 is a block diagram of a control device for a clothes dryer according to an embodiment of the present invention, FIG. 2 is a circuit diagram of the abnormality detecting means, and FIG. 3 is a graph showing changes in temperature difference between intake and exhaust during a drying operation. It is the figure shown. 3,4 ... Temperature detection means, 5 ... Timer, 12 ... Temperature difference detection means.

Claims (1)

(57) [Claims] 1. A temperature detecting means for detecting an intake air temperature and an exhaust gas temperature of a drying chamber for storing clothes dried by hot air, and a temperature difference between the intake air and the exhaust gas is detected from the temperature detecting means, and the temperature difference is a predetermined value. Clothes equipped with a temperature difference detection means for starting the time counting operation of the timer when the temperature detection means or the abnormality detected in the device is detected and for ending the drying when the time measurement of the timer reaches a predetermined time. Dryer controller.