JPS63318999A - 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 the Invention The present invention relates to a control device for a clothes dryer that controls a heater by turning on and off a thermostat.

2. Description of the Related Art As shown in FIG. 4, a conventional clothes dryer control device has a configuration including a time switch 1 having a timer motor 14a.
4, a motor rotates a drum in which clothes are placed, a fan that sends hot air into the drum, and a heater 16 for heating.
Electricity was applied to the drum and hot air was sent into the drum to dry the clothes. In this case, the contacts sw, sw of the time switch 14
2 is in the ON state. In addition, in order to control the temperature inside the drum at a constant level, the heater 16 is turned on depending on the temperature inside the drum.
, a thermostat 17 that turns off was connected in series.

Problems to be Solved by the Invention In such a conventional clothes dryer control device, if the thermostat 17 is malfunctioning and short-circuited, the temperature inside the drum will exceed the temperature at which the thermostat 17 is turned off. However, once the drying time is set using the time switch 14, the time switch 14 is turned off until the set time has passed and the heater is turned off. Since it is not possible to stop the power supply to 16, there is a problem that there is a risk of fire.

Furthermore, if the thermostat 17 is disconnected due to a malfunction, the heater 16 will not be energized, but the user will only notice that the clothes are not being dried until the originally set drying time has ended. The problem was that it was empty.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to operate a thermostat safely even in the event of a failure, and to quickly notify a user of an abnormality.

Means for Solving the Problems In order to achieve the above object, the present invention includes a fan that sends hot air heated by a heater into a drum, and a fan that controls the heater according to the temperature inside the drum. a temperature sensor attached near the 1111-grip thermostat, and an operation control unit that inputs temperature data of the temperature sensor and ON/OFF data of the thermostand and makes a comparison decision, the operation control unit The system is configured to stop operation earlier than usual if it is determined that there is an abnormality based on the comparison result.

Effect With the above configuration, in the event of a thermostat short-circuit failure or thermostat disconnection failure, the operation is stopped in a time shorter than the initially set drying time, thereby making it possible to quickly notify the user of the abnormality and improve safety. It is possible to achieve improvement in sexual performance.

Embodiments Hereinafter, embodiments of the present invention will be explained based on FIGS. 1 to 3.

In the clothes dryer control device of this embodiment, a motor 2 is connected to a commercial power source 1 via a contact SW1 of a time switch 4. The motor 2 rotates a drum in which clothes are placed and a fan that blows hot air into the drum via a belt. The heater 3 is connected to the contact sw1. of the time switch 4. It is connected to the commercial power supply 1 via sw2 and thermostat 6. The contact SW1 of the time switch 4 controls the motor 5,
The contact SW2 controls the heater 3, and these contacts SW,
.

SW2 is turned on and off by a timer motor 5.

Furthermore, the thermostat 6 turns on the heater when the temperature is below 60°C, and turns it off when the temperature is above 65°C.
The heater is turned on and off by not energizing the heater in the FF state.

7 is the ON/OFF detection part of the thermostat, and 100V (commercial power supply) is connected between both ends 71L and 7b of the thermostat 6.
is applied, it is determined that the thermostat 6 is in the OFF state, and both ends 72L and 7b of the thermostat 60 are turned off.
If the potential difference between them is oV, it is determined that the thermostat 6 is in the ON state, and the thermostat is turned
The data is sent to the entire operation control unit 1o. Reference numeral 8 denotes a temperature sensor, such as a thermistor, which is installed near the thermostat 6. Reference numeral 9 denotes a temperature detection section, which detects the temperature inside the drum using the temperature sensor 8. Reference numeral 10 denotes an operation control unit that controls thermostat ON and thermostat O from the OFF detection unit 7.
N. Input the OFF data and the temperature data from the temperature detection section and compare and judge. A power supply section 11 supplies power to the temperature detection section 9, the operation control section 10, and the ON/OFF detection section 7 (thermostat). Reference numeral 12 denotes a control board that includes a temperature detection section 9, an operation control section 10, a thermo ON/OFF detection section 7, a power supply section 11, and the like. Reference numeral 13 denotes a drive unit that controls the time limit of the timer motor 5 based on a signal from the operation control unit 10.

FIG. 2 is a flowchart of the operation procedure in the control board 12, and FIG. 3 is a flowchart of the operation procedure in the control board 12, and FIG.
3 is a time chart of FF signals.

The operation of the clothes dryer of this embodiment configured as described above will be explained below.

Put the clothes into the drum and turn the time switch 4.
For example, if the drying time is set to 120 minutes, the motor 2, heater 3, and control board 12 are energized to start the drying operation.

As shown in FIGS. 2 and 3, when the thermostat is normal, the timer motor is activated by the duty cycle of the ON and OFF signals of the timer motor 5 sent from the operation control section 10 to the drive section 13 of the timer motor 5. Step 6 is step 1, for example, repeating ○N for 1 minute and OFF for 3 minutes.
), when the drying time of 120 minutes has elapsed, the time switch 4 is turned off and the drying is completed. For example, if the thermostat is disconnected from the beginning due to a failure, the thermostat 6 will turn OFF and the thermostat 6 will turn OFF.
(The operation control unit 1o is set to a thermostat)
Send OFF data (step 2). Operation control section 10
inputs temperature data from the temperature detection section 9 (step 3
).

The operation control unit 10 compares and determines whether the value of this temperature data is, for example, 40° C. or less (step 4). Here, if the temperature data is below 40°C, it is below the thermostat ON temperature (60°C), so the thermostat must be in the aHoN state. However, since the thermostat OFF data is input, it can be determined that the thermostat is in a disconnected state due to a failure (step 5). Therefore, the operation control section 10 continuously turns on the duty cycle of the CAM and OFF signals of the timer motor 5 sent to the drive section 13 of the timer motor 5.
(Step 6). At this time, as shown in Figure 3,
The drying time was initially set to 120 minutes, but when the thermistor is abnormal, the ON time of the timer motor 6 is quadrupled, so the drying time becomes 30 minutes as shown in A.

Next, if the thermostat 6 is short-circuited due to a failure from the beginning, the thermostat (thermostan) is turned on.

The OFF detection unit 7 determines that the thermostat 6 is in the ON state, and sends data indicating that the thermostat is ON to the operation control unit 1o (step 2). The operation control unit 1o is a temperature detection unit 9
Input temperature data from (Step 7). The operation control unit 10 compares and determines whether the value of this temperature data is, for example, so'C or higher (step 8).

Here, if the value of the temperature data is 80° C. or higher, it is the thermostat OFF temperature (66° C.) or higher, so the thermostat 6 must be in the OFF state. However, since the thermostat ON data has been input, it can be determined that the thermostat is in a short-circuit state due to a failure (step 9). Therefore, the operation control section 10 sends the timer motor 5 to the drive section 13 of the timer motor 5.
ON.

Continuously turn on the duty cycle of the OFF signal (
Step 6). At this time as well, as shown in FIG. 3, the drying time is 30 minutes, which is the initially set μ of 120 minutes.

In this example, the ON/OFF duty of the timer motor was changed in order to shorten the drying time when the thermostat was abnormal.This was done by attaching a variable speed gear to the timer motor and changing its gear ratio to shorten the drying time. Good too. Furthermore, although an AC-controlled timer motor was used in this embodiment, a DC-controlled timer motor can be used to turn the timer motor ON and OFF directly according to the signal waveform from the operation control unit, and change the period of the signal waveform. The drying time may be shortened by Furthermore, the operation control section is configured by a microcomputer, the drying time is changed to a short time in case of an abnormality, and the contact point sw1. This can also be achieved by controlling sw2 on and off using a relay or the like.

Effects of the Invention As is clear from the above embodiments, the present invention compares and determines ON/OFF data of the thermostat and temperature data in the operation control section, and when the thermostat fails, the drying time is determined by a signal from the operation control section. It is possible to complete the process in a shorter time than the initial setting, prevent a fire from occurring, and make the user quickly recognize that there is a malfunction.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing a control device for a clothes dryer according to an embodiment of the present invention, Fig. 2 is a flowchart showing the control procedure of the control unit, Fig. 3 is a time chart of ON/OFF of the timer motor, FIG. 4 is a configuration diagram showing a conventional control device for a clothes dryer. 1°°゛°°°Commercial power supply, 2...Motor, 3.
...Heater, 4...Time switch, 5
・Old, ;7 ,/Marmotor ・6...Thermostat, 7...Ser1 ゛Tanoto ON,
OFF detection section, 8...Temperature sensor...
... Temperature detection section, 10... Operation control section, 11.
.....basket 1 part, 12.....control board, 13.
·····Drive part. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 3 (Kuu-ri"-Monuku 7) i'l Gin Figure 4

Claims (2)

[Claims] (1) A fan that sends hot air heated by a heater into the drum, and is turned on and off depending on the temperature inside the drum.
a thermostat that controls the heater; a temperature sensor installed near the thermostat;
Temperature data of the temperature sensor and O of the thermostat
N. A control device for a clothes dryer, comprising an operation control section that inputs OFF data and makes a comparison decision, and the operation control section stops the operation earlier than usual if it is determined that there is an abnormality based on the result of the comparison decision. (2) When the temperature data of the temperature sensor is equal to or lower than the ON temperature of the thermostat and the thermostat is OFF, or when the temperature data of the temperature sensor is equal to or higher than the OFF temperature of the thermostat, and the 2. A control device for a clothes dryer according to claim 1, wherein an abnormality is determined when a thermostat is turned on.