JPS60246797A - dryer control device - 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 dryer used in general households.

Conventional structure and its problems Traditionally, dryers such as drum-type clothes dryers that dry clothes with hot air use mechanical timers to determine the appropriate operating time for chains with a certain amount of cloth depending on the type of cloth. It was common to set However, with this configuration, the timer setting relies on the user's experience and intuition, which causes problems such as drying of the clothes, damaging the clothes, and wasting power. There is also a method that detects the dry state by detecting the surface resistance of the cloth using an electrode and detecting the exhaust temperature using an exhaust temperature sensing element, but if the amount of cloth is small, the cloth may not come into contact with the electrode.
In some cases, the optimum drying condition could not be detected. In addition, it is necessary to apply a high voltage to detect high resistance using electrodes, which poses a safety problem.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional problems and provides a dryer control device capable of detecting the optimum drying state even when the amount of cloth is small.

Composition of the Invention The dryer control device of the present invention includes an exhaust temperature detection means for detecting exhaust temperature, and compares the output of the exhaust temperature detection means with a predetermined value, and detects that the output of the exhaust temperature detection means is equal to or higher than the predetermined value. a first timer means for measuring the time from the start of operation until the first timer outputs the control signal; a calculation means for determining the length of time, and a calculation means for measuring the time determined by the calculation means, interrupting the time measurement while the comparison means is outputting the control signal, and outputting the control signal when the time measurement is finished. a second timer output means, a first control means for stopping the operation of the heater only when a control signal is output from the comparison means, and a signal output from the second timer means. It is equipped with a second control means for stopping the operation of the heater motor, and is configured to obtain an optimum drying condition.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In FIG. 1, reference numeral 1 denotes an exhaust temperature detecting means which detects the exhaust temperature during operation of the dryer.

Comparison means 2 compares the output of the exhaust gas temperature detection means 1 with a predetermined value, and outputs a control signal when the output of the exhaust temperature detection means 1 exceeds the predetermined value. Reference numeral 3 denotes a first timer means, which measures the time from the start of operation of the dryer until the comparison means 2 outputs a control signal.

Reference numeral 4 denotes a calculation means, which determines a length of time corresponding to the time measured by the first timer means 3 when the comparison means 2 outputs a control signal. Reference numeral 6 denotes a second timer means, which measures the time determined by the calculation means 4, interrupts the time measurement while the comparison means 4 is outputting the control signal, and starts the control when the time measurement ends. Output a signal. Reference numeral 7 denotes a first control means, which cuts off power to the heater 9 while the comparison means 2 outputs a control signal. 5 is a second control means which, when a control signal is inputted from the second timer means 6, controls the heater 9. The power supply to the motor 8 is cut off, and the operation is completed.

Next, the operation of the above configuration will be explained.

When the operation starts, the exhaust gas temperature rises, but the change varies depending on the amount of cloth, as shown in FIG. In FIG. 2, T1 indicates the case where the amount of cloth is large, and T2 indicates the case where the amount of cloth is small.

Then, when the exhaust temperature is T (for example, 65"C), a control signal is output from the comparison means 2. At this time, the time measured by the first timer means 3 is a, if the amount of cloth is large. can be,
If the amount of cloth is small, it is a2. The calculating means 4 calculates the time from the start of operation until the exhaust gas temperature reaches Ta (ttla, if the amount of cloth is large).

When the amount of cloth is small, the time to energize the heater 9 is determined according to a). This time is 1 when the amount of cloth is large, and is 2 when the amount of cloth is small.

For example, if a is 0 to 8 minutes, b is 6 minutes, and a is 8 minutes.
-15, b is 9 minutes.

The second timer means 6 measures the time determined by the calculation means 4. However, when the control signal is output from the comparison means 2, the second timer means 6 interrupts the time measurement, and the first control means 7 cuts off the power supply to the heater 9.

The second timer means 6 starts the second timer when the time measurement ends.
A control signal is output to the control means 6. This second control means 5
For example, the heater 9 is activated by the control signal of the second timer means 6.
．． The power to the motor 8 is cut off, and the operation is completed. At this time, the drying rate of the cloth has reached a predetermined value. The flow of the above operations is as shown in the flowchart of FIG.

Since the operation is controlled using the exhaust gas temperature as an input signal in this way, the drying completion state of the cloth can be accurately detected without being affected by the type or amount of cloth.

In the embodiment, the entire control device is provided by a microcomputer, but the control device is not necessarily limited to this.

Effects of the Invention As is clear from the above explanation, according to the present invention, the length of the subsequent operation time is determined according to the time when the exhaust gas temperature reaches a predetermined value, and the length of time when the heater is not energized is determined according to the time when the exhaust gas temperature reaches a predetermined value. Since there is no time measurement, even if the temperature is controlled, the dryness of the cloth will surely reach a predetermined value when the operation is stopped, and the cloth will not become undried or overdried.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a control device for a dryer showing an embodiment of the present invention, Fig. 2 is a characteristic diagram showing the operating time and exhaust temperature of the dryer, and Fig. 3 is a diagram showing the operation of the control device. It is a flowchart. 1... Exhaust temperature detection means, 2... Comparison means, 3... First timer means, 4...
Calculating means, 5... Second control means, 6...
・Second timer means, 7...first control means,
8...Motor, 9...Heater. Name of agent: Patent attorney Toshio Nakao and one other person Hibiki

Claims (1)

[Claims] an exhaust temperature detection means for detecting the exhaust gas temperature; a comparison means for comparing the output of the exhaust temperature detection means with a predetermined value and outputting a control signal when the output of the exhaust temperature detection means exceeds the predetermined value; a first timer means for measuring the time from the start until the comparison means outputs the control signal;
A calculation means for determining a length of time according to the time measured by the first timer means, and a calculation means for measuring the time determined by the calculation means, and interrupting the time measurement while the comparison means outputs a control signal. a second timer means for outputting a control signal when the time measurement ends; a first control means for completely stopping the operation of the heater only when a control signal is output from the comparison means; A control device for a dryer comprising a second control means for stopping operation of a heater and a motor based on an output signal from the means.