JPS63288197A - Control apparatus of clothing dryer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a control device for a clothes dryer that detects the temperature of intake air and exhaust air in a drying chamber and automatically stops drying by using the difference in temperature between them. be.

2. Description of the Related Art Conventionally, a control device for a clothes dryer of this kind has been disclosed in Japanese Patent Application Laid-Open No. 1986-
It had the configuration shown in Japanese Patent No. 198398.

In other words, a thermistor is installed to detect the temperature on the intake and exhaust sides of the drying chamber, and the temperature difference between the intake and exhaust sides is detected based on the signal from the thermistor. When this temperature difference reaches a predetermined value or more, the timer starts timing. The system was designed to start operation and stop operation after a set time. The above-mentioned 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 with a timer.

Problems to be Solved by the Invention However, in the conventional configuration, if the thermistor fails, the temperature difference based on the signal from the thermistor may not reach a predetermined value or more, so the timer does not measure time and the drying operation ends. The problem was that it did not.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a control device for a clothes dryer that can reliably terminate the drying operation even if a temperature detection means such as a 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 includes temperature detection means for detecting the intake and exhaust temperatures of a drying chamber in which clothes to be dried with hot air are stored; The temperature difference detection means detects a temperature difference between the intake air and the exhaust air from the temperature detection means, and when the temperature difference reaches a predetermined value, a timer operates. Alternatively, the configuration is such that the timer starts the timing operation even when an abnormality occurs in the device.

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

EXAMPLE Hereinafter, an example of the present invention will be explained with reference to FIGS. 1 to 3.

As shown in FIG. 1, the configuration of the control device for the clothes dryer in this embodiment is as shown in FIG. This detection signal is detected by the temperature difference detection means 12.
It is output to .

This temperature difference detection means 12 detects the difference between the intake air and exhaust air temperatures, and when the temperature difference reaches a predetermined value or more, the timer 6 starts the timing operation. This timer 6 controls the energization of the heater 1 and motor 2 that generate hot air.
The contact 13 between the motor 2 and the AC power source 11 is opened after a predetermined time period has elapsed to stop the drying operation.

Next, the abnormality detection means of the temperature difference detection means 12 will be explained with reference to FIG. That is, temperature detection means (thermistor) 3
Alternatively, DC voltage V is applied to 4, a series body of resistor 7, and a series body of resistors 8 and 9. . is applied, and the comparator 10 inputs the voltages at midpoints a and b of each series body.

In the above configuration, the operation is as follows: The heater 1 and motor 2 agitate the clothes in the drying chamber and dry them with hot air.The degree of dryness of the clothes depends on the change in temperature difference between the intake and exhaust air in the drying chamber. At this time, I was asked to
If the temperature difference is normal as shown in FIG.
make it work. However, if an abnormal phenomenon occurs as shown in Figure 3, or a failure occurs in the temperature detection means 3 and 4,
Using a comparator 10, the thermistor 6 and the reference resistor 7
The magnitude of the zero division voltage a is compared to detect an abnormality in the temperature detection means. Also, analysis of abnormal temperature curves as shown in Figure 3 (
For example, if the temperature difference after a certain period of time has passed after the start of drying operation is over a certain value, etc.), an abnormality in the equipment is detected. This allows the action to be completed quickly.

Effects of the Invention As is clear from the above embodiments, according to the present invention, even if an abnormality occurs in the clothes dryer and data such as temperature detection is incorrect, the drying operation is always completed, thereby preventing loss of dry clothes. It is superior in terms of safety and equipment safety.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a control device for a clothes dryer that is an embodiment of the present invention, Fig. 2 is a circuit diagram of the abnormality detection means, and Fig. 3 shows changes in temperature difference between intake air and exhaust air during drying operation. FIG. 3.4...Temperature detection means, 6...Timer, 12...Temperature difference detection means.

Claims (1)

[Claims] temperature detection means for detecting the temperature of intake air and exhaust air of a drying room in which clothes to be dried with hot air are stored; and a temperature difference between the intake air and the exhaust air from the temperature detection means, and when this temperature difference reaches a predetermined value; A control device for a clothes dryer, comprising a temperature difference detection means for performing a time measurement operation of a timer, and the temperature difference detection means starts the time measurement operation of the timer even when an abnormality occurs in the temperature detection means or the device.