JPS602294A - 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 (A) Field of Industrial Application The present invention relates to a clothes dryer for drying clothes washed by a water washer and a dry washing machine.

(B) Prior Art Conventional clothes dryers are operated by an operator who changes the set temperature of a temperature control thermostat or the like depending on when drying washed items and when drying dry items.

However, when drying clothes that have been washed with petroleum-based solvents, if you forget to change the temperature setting and run the machine at a high temperature, there is a risk of ignition, and the fabric is easily damaged by the heat.

(c) Purpose of the Invention The object of the present invention is to provide a clothes dryer that automatically changes the drying temperature between washed items and dry items.

B) Structure of the Invention The clothes dryer of the present invention comprises a hot air supply means, a drying chamber to which hot air is supplied from the hot air supply means, and a gas detection means installed in an exhaust path from the drying chamber.

The hot air supply means is controlled so as not to raise the temperature of the hot air to a high temperature before a predetermined time has elapsed from the start of operation, and after the elapse of the predetermined time, when the gas detection means does not detect a dry laundry solvent, the hot air is The hot air supply device is configured to include temperature control means for controlling the hot air supply means so that the temperature is high and low when detected.

There may be a certain amount of lag time between when the solvent gas is released from the clothing and when it is detected by the gas detection means.
Since the temperature control means does not raise the temperature of the hot air to a high temperature for a predetermined time after the start of operation, the temperature of the hot air does not become high during this delay time.

09 Embodiment (0) shown in Figure 1 is an embodiment of the clothes dryer of the present invention. (1) is an operation panel with a timer knob (2) for setting drying time and a thermometer (3). ) and a steam gauge (4) are attached. (5) is a door for putting in and taking out clothes, and (6) is a door for cleaning the lint filter α provided inside.

Figure 2 is a sectional view taken along line A-A' in Figure 1. Air is taken in from the intake port ttn by the fan QS, and air is taken in from the radiator (
7) and reaches the drum αQ that stores the dried material. The hot air after drying the clothes passes through a filter +14) to remove lint and is then exhausted to the outside. High-temperature steam is supplied to the radiator (7) from the steam inlet α2 via the solenoid valve (8), and is discharged from the drain pipe (131).The hot air temperature is controlled by opening and closing the solenoid valve (8). The hot air temperature is detected by a thermistor (9) installed directly below the radiator 17).

The gas sensor is provided directly below the drum aα. If the clothes placed in the drum αQ are dry laundry, the dry laundry solvent gas released from the clothes is detected and the resistance value of the clothes is lowered. However, in the case of washed items, there is no change in resistance value.

The clothes dryer (0) of this embodiment consists of the electric circuit system shown in FIG. , the fan motors (7) 8 and the drum motor (to) are energized.

FIG. 4 shows the details of the temperature control circuit α (to). When the timer drive motor αη starts operating, the timer contact is off, the solenoid valve (8) for steam supply control is not energized and closed, and the radiator (7)
is not heated. When the predetermined time T has elapsed, the timer contact
closes, so the solenoid valve (8) is opened when the output of the OR gate 3 reaches high level, and the radiator (7) is opened.
) to heat. The inputs to the OR gate are the outputs of the AND gate (To) and □□□.

A voltage comparator (c) is connected to one input of the A'ND gate sill.
The output signal is inverted by the inverter (to) and is input to one input of the AND gate (2) without being inverted. The other input 1 of the AND gate (to) contains the output of the voltage comparator Qυ, and A
The other input of the ND gate (C) contains the output of the voltage comparator (B).
The inversion input of □ is equipped with a thermistor (9) that detects the hot air temperature.
) and the resistor (R1), a voltage obtained by dividing the DC power supply voltage (Vc) is input. This voltage corresponds to the hot air temperature. The non-inverting input of the voltage comparator Q11 A corresponding voltage is inputted, and a voltage corresponding to 140°C is inputted to the non-inverting input of the voltage comparator (2).

Therefore, the output of voltage comparator +211 indicates that the hot air temperature is 80℃.
It is a high level when it is less than 80°C, and it is a low level when it is 80°C or more. Further, the output of the voltage comparator (2) is at a high level when the hot air temperature is less than 120°C, and is at a low level when the hot air temperature is 120°C or higher. The voltage of the capacitor (0) is input to the inverting input of the voltage comparator, and the resistor (R3) (R4) is input to the non-inverting input of the voltage comparator.
The monthly divided voltage is input. Capacitor (0)
The voltage is the voltage divided by the gas sensor (2) and the resistor (R2) and charged through the diode (D).

The circuit constants of the gas sensor 1201 and resistors (R2) to (R4) are such that when the gas sensor detects petroleum dry solvent gas and lowers its own resistance, the output of the voltage comparator (c) becomes a low level. I have decided to do so.

Now, when I put the laundry in the drum aα and wind up the timer (up to one knob), the drum starts rotating and the fan α
Wind is distributed by 9. However, since the timer contact (2) is off at this time, the air supplied to the drum 00 is air that has not been heated to a high temperature.

Drum (if the laundry put in 101 is dry laundry,
It takes some time for the solvent gas to be released from the laundry and detected by the gas sensor (A), and the partial voltage v8 due to the gas sensor (■) and the resistor (R2) I is determined by the delay time t as shown in Figure 5. It peaks at After that, the temperature gradually decreases as the drying progresses. Since the capacitor (0) maintains the maximum value of v8, the capacitor voltage Va maintains the peak value of v8 even after the delay time t as shown in FIG.

Therefore, if the predetermined time T is set to be longer than the delay time t, the output of the voltage comparator θ will already be at a low level when the timer contact 2 closes, that is, when the predetermined time T has elapsed. If the output from the voltage comparator is low level,
The AND gate (c) cuts the output of the voltage comparator @, and on the other hand, the output of the inverter (4) becomes high level, so the AND gate □□□ transmits the output of the voltage comparator L211 to the OR gate surface. However, the output of the voltage comparator (211) becomes high level when the hot air temperature is less than 80℃,
It becomes low level above 0°C. Therefore, the solenoid valve (8) is controlled to be opened when the hot air temperature is less than 80°C and closed when it is 80°C or higher. In the end, this resulted in a hot air temperature of 8
It is kept around 0°C. Even if the drying progresses and the solvent is no longer detected, the capacitor voltage Va maintains the peak value of Vs, so the hot air temperature is still maintained at around 80°C.

If the laundry placed in drum a [ll] is washed, the output of the voltage comparator is at a high level because the gas sensor ■ does not detect the solvent, and the AND gate (5) ORs the output of the voltage comparator. Inform the gate. Since the output of the inverter ■ becomes a low level, the AND gate is connected to the voltage comparator C! Cut the output of 11. However, the output of the voltage comparator is a signal that becomes high level when the hot air temperature is less than 120°C, and becomes low level when the hot air temperature is 120°C or higher. Therefore, after a predetermined period of time has elapsed, the electric/magnetic valve (8) is controlled to open when the hot air temperature is less than 120°C and close when it is 120°C or higher, and the hot air temperature is ultimately maintained at around 120°C. .

As another embodiment, as shown in FIG. 6, the relay contact (support) is removed from the temperature control circuit αQ and is instead turned on from the start of operation until a predetermined time and turned off after a predetermined time. One example is a timer contact (29) installed on the output side of the voltage comparator. In this case, from the start of operation until a predetermined time, it is forced to dry with hot air at around <80°C, the same as drying laundry. Drying is performed.The operation after the predetermined time has elapsed is the same as that of the circuit 081 described above.

(f) Effects of the Invention According to the clothes dryer of the present invention, the gas detection means detects the solvent for dry washing, and automatically lowers the drying temperature of the dry items to a lower temperature than the drying temperature of the washed items. This simplifies operation as there is no need to change the set temperature.There is no risk of ignition caused by a mistake in the reed temperature setting, making it highly safe.Furthermore, the drying temperature is not set to a high temperature for a specified period of time after the start of operation, making it easy to detect gas. Safety is maintained even if detection of the solvent by means is time consuming.

[Brief explanation of the drawing]

FIG. 1 is a front view of an embodiment of the clothes dryer of the present invention, FIG. 2 is a sectional view taken along line AA' in FIG. 1, and FIG. 3 is a schematic electrical circuit diagram of the clothes dryer shown in FIG. 1. , Fig. 4 is a detailed circuit diagram of the temperature control circuit, and Fig. 5 shows Vs in the circuit shown in Fig. 4.
FIG. 6 is a characteristic diagram showing an example of the time change of Vc and Vc, and FIG. 6 is a circuit diagram showing a main part of another embodiment. (0)...Clothing dryer, (7)...Radiator,
(8)... Solenoid valve, (9)... Thermistor, (+0
1...Drum, all...Intake port, Uri...Steam inlet, (131...-Drain pipe, α--Temperature control circuit, ■...Gas sensor, QB@(c)...・Voltage comparator, c!41 device...AND gate, @...inverter, □□□...OR gate, @ (29')...
timer contact. ward g -to @ general

Claims (1)

[Claims] 1. A hot air supply means, a drying chamber to which hot air is supplied from the hot air supply means, a gas detection means installed in the exhaust path from the drying chamber, and a temperature of the hot air set to a high temperature before a predetermined time elapses from the start of operation. The hot air supply means is controlled so that the temperature of the hot air is set to a high temperature when the dry laundry solvent is not detected by the gas detection means after the elapse of the predetermined period of time, and the temperature of the hot air is set to a low temperature when the dry laundry solvent is detected. A clothes dryer comprising a temperature control means for controlling the temperature.