JPS5932499A - Control apparatus of 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 the Invention The present invention relates to a control device for a dryer equipped with a rotating drum for transferring articles to be dried such as clothes.

4^ Problems with the structure of the conventional example Conventionally, in this type of dryer, the degree of dryness of the material to be dried is electrically detected using electrodes, but the detection level is around 100% drying rate, ,.

A drying rate of 10 that can be judged as dry by the feel of the vanes.
It was lower than 1-103%. For this reason, a method has been adopted in which drying is continued for a certain period of time after the detection level is detected, but it is known that this time varies greatly depending on the weight of the clothing and other factors.

Therefore, in the past, a method was used in which the user externally determined the weight of the clothing and set a certain drying time after the detection level was detected, but this setting placed a burden on the user. It was a hassle.

Purpose of the Invention The present invention solves the above conventional problems, and automatically sets a fixed drying time after detecting a fixed drying level, thereby reducing the burden on the user and improving drying performance. The purpose is to

Structure of the Invention In order to achieve the above object, the present invention includes a motor that rotationally drives a rotating drum into which a material to be dried is charged, and a heating element that heats the air fed into the motor and the rotating drum. A timer that controls and pages the energization of the motor, current detection means for detecting the current of the motor, and comparison means that receives the output of the current detection means as an input, and inputs the output of the comparison means to the timer. The drying time is automatically set according to the weight of the material to be dried.

Description of examples Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is an electrical block diagram of the control device, in which the dryness detection means is constituted by, for example, an electrode provided in a rotating drum. B is a current detection means for detecting the current of the motor for driving the rotating drum, and its output is input to a comparison circuit C. In comparator circuit C, depending on the input,
Set the time of timer D. Timer D is operated by the output of the dryness detection means, generates a timer output after a certain period of time determined by the comparison circuit C, and energizes the heater connected to timer D, which is a heating element for heating dry air. cut off.

Fig. 2 shows a specific circuit diagram, in which 1 is a commercial power source, and this commercial power source 1 connects an electrode 3, which is a dryness detection means, and air entering the drying chamber through a switch 2 that opens and closes when the door is opened and closed. It is applied to the heater 4 for heating. Therefore, when the door is open, the electrode 3 is isolated from one commercial power supply line.

The output of the electrode 3 is input to the control circuit 6 via the comparator 6. That is, the dryness detection output from the electrode 3 is input. Until this detection input is input, the comparator 6
energize.

Reference numeral 7 denotes a power light cut-off switch, which connects the commercial power source 1 to the load and the control circuit. Switch 2 has a drying heater connected in series, and a switch 4
, 4 and a motor 8 for rotating the rotary drum serving as a dryer are connected to the heater 4.4 and the motor 8, which are controlled by bidirectional semiconductor switching elements 9.10.11.

When the power light cut-off switch 7 is turned on, the AC power is turned on through the resistor 12. Diode 13. It is rectified and smoothed by a capacitor 14, and supplies DC power to the following control circuit. The DC power is applied to the microcomputer 6', which is the main part of the control circuit 6, and the microcomputer 6' becomes operational.

15.16 is a switch for setting the strength of the heater 4.4; when the switch 16 is pressed, the heater is set to high; when the switch 16 is pressed, the heater is set to low. The outputs of these switches 15 and 16 are input to the microcomputer 6', and the settings are stored in a storage section provided inside the microcomputer 6'.

1 is a start switch for starting the drying operation, and is input to the microcomputer 6'.

Now, when the start switch 17 is pressed, the microcomputer 6' starts the driver 18. Via a resistor 19, the bidirectional semiconductor switching element 9.10.11 is controlled.

In other words, when the heater strength setting is strong, the heater 4.4
and the bidirectional semiconductor switching element 9.10.11 is made conductive in order to energize the motor 8.

6 Pages As time progresses and the drying of the clothes inside the drum progresses, the impedance of the electrode 3 provided inside the drum to be in contact with the clothes increases. Since this electrode 3 is connected to the switch 2 and the diode 20° resistor 21, 22, when the impedance between the electrodes 3 becomes large, the voltage between the electrodes 3 becomes large. Also, at this time, the resistance 22 is several M.
A resistance of Ω is sufficient.

The voltage between the electrodes 3 is input to the gate of a field effect transistor 5, which is a comparator. The drain of the field effect transistor 5 is connected to the above-mentioned direct power source by a resistor 23.2.
A voltage divided by 4 is applied.

Therefore, in the field effect transistor 5, when the gate applied voltage and the divided voltage are compared and the divided voltage is higher, the field effect transistor 6 becomes conductive, and the transistor 26 is turned on via the resistor 25. Continuity, resistance 2
The signal is input to the microcomputer via 4. The microcomputer 6' can determine the dry state inside the 7-page drum by checking the conduction state of the transistor 26.

27 is a Zener diode provided so that the gate of the field effect transistor 6 is not reverse biased.

As mentioned above, as the clothes dry, as a result,
Since the transistor 26 begins to conduct, the microcomputer 6' detects that the progress of drying the clothes has become constant and has reached a level higher than 10 bells. After this detection, the micro combi coater 6' operates the internal first timer, and after the timer operation is completed, the power supply to the heater 4.4 is stopped, and after further operating the internal second timer, The energization of the motor 8 is also stopped. At this time, the setting value of the first timer is
Determined by the amount of clothing inside the drum. That is, the output of the lance 28 is rectified by the rectifier diode 29, and the output of the lance 28 is rectified by the electrolytic capacitor 30. Comparators 32 and 3, which are the comparison circuit C, are smoothed by the discharge resistor 31.
Enter 3.

A reference voltage divided by resistors 34, 36° and 36 is applied to comparators 32,33.

Now, when the weight of the clothing is small, the voltage across the capacitor 3o is low, and when the weight increases, the voltage becomes high. Therefore, when the weight is very small, the outputs of the comparators 32 and 33 are LOW, and when the weight is large, the outputs of the comparators 32 and 33 are both HIGH. In the middle, only the comparator 33 becomes HIGH. The microcomputer 6' receives the output of the comparator as input, and can detect the weight of the clothing based on its state.

When the weight is large, the set value of the first timer is set large, and when the weight is small, the set value is set small.

Therefore, the drying time can be set according to the weight of the clothes in the drum.

In addition, 37 is a stop switch, and when this stop switch 37 is pressed, the power supply to the heater 4.4 is immediately stopped.
A 9-page third timer installed inside the microcomputer 6' operates, and after a certain period of time, the motor 8
Power to the unit will also be stopped.

Effects of the Invention As described above, according to the present invention, after detecting a certain drying state, the subsequent fixed drying time is determined depending on the weight of the object to be dried, and the drying operation is automatically performed, which is troublesome. Good drying performance can be obtained without the need for extensive time setting operations.

[Brief explanation of the drawing]

FIG. 1 is an electrical diagram of a dryer control system according to an embodiment of the present invention, and FIG. 2 is a specific circuit diagram thereof. B...Current detection means, C...Comparison circuit (comparison means), D...Timer. Name of agent: Patent attorney Toshio Nakao and 1 other person
1 figure

Claims (1)

[Claims] A motor that rotationally drives a rotating drum into which the material to be dried is loaded, a timer that controls energization of the motor and a heating element that heats the air sent into the rotating drum, and a current detection means that detects the current of the motor. and a comparison means which inputs the output of the current detection means, and is configured to input the output of the comparison means to the timer.