JPS6036098A - Clothes 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 This invention relates to a clothes dryer, and more particularly to a temperature control device for a clothes dryer.

(B) Prior art In conventional clothes dryers, especially steam-type clothes dryers, the heat capacity of the radiator is large, so even if the hot air temperature reaches a preset target temperature and the steam supply to the radiator is stopped, The hot air temperature kept rising and then dropping.

Therefore, even if a target temperature suitable for the clothes to be dried is set during operation, the hot air temperature actually becomes higher than the target temperature, and there is a risk that the clothes may be damaged by the heat. 6th
The figure is a graph showing that the hot air temperature exceeds the target temperature in this way.

(c) Purpose of the Invention The present invention provides a clothes dryer that minimizes damage to clothes due to heat by minimizing the time during which hot air temperature exceeds a target temperature.

B) Structure of the Invention The clothes dryer of the present invention comprises: a balloon heating means for heating the air sent to the clothes to be dried into hot air; a hot air temperature means for detecting the temperature of the hot air and outputting a corresponding signal; The target temperature means outputs a signal corresponding to the target temperature of the balloon heating means, and the control means controls on/off the balloon heating means, and the control means controls the output of the hot air temperature means at the beginning of operation. The balloon heating means is turned on until reaching the output of the target temperature means, and then turned off, and after being turned off, the maximum amount by which the output of the hot air temperature means exceeds the output of the target temperature means, that is, the amount of retardation. After that, the balloon heating means is turned off while the sum of the output of the hot air temperature means and the after-cooling amount exceeds the output of the target temperature means, and is turned on otherwise. It is characterized by the fact that it operates as follows.

(E) Embodiment (1) shown in FIG. 1 is an embodiment of the clothes dryer of the present invention, which is a steam-type clothes dryer having a clothes loading door (2) at the front. Above this door (2), there is a main switch (3) for turning on and off the power, a keyboard switch (4) for setting the operating cost, local setting, or temperature, and an automatic detection course set as the operating course. Dryness adjustment knob (5) for adjusting the degree of dryness at the end time when
, a fluorescent display tube (6) for displaying the hour, a fluorescent display tube (7) for displaying the temperature, and a steam pressure gauge (8) for displaying the power of the steam that is the heat source for drying.

As shown in Fig. 2, a drying drum (10) is rotatably provided in the drying chamber formed in the center of the clothes dryer (1), a radiator (9) is provided in the upper part of the drying drum (10), and a radiator (9) is provided in the lower part of the drying drum (10). A bottomed cylindrical filter (+1) and an exhaust blower (I2) are installed at the bottom. The radiator (9) is
It is connected to a steam supply pipe (one steam valve) via a steam valve (+3), and is also connected to a discharge pipe (15).

The drying drum (10) is rotated by a motor (18) via a pulley (16) θ, and the exhaust blower (12) is rotated by another motor (19). When the exhaust blower (12) is rotated, air is sucked in from the intake port (7!0) and flows into the radiator (9!
), the hot air enters the drying drum (lO), removes moisture from the clothes, and is then discharged from the exhaust port (2). A hot air temperature detector (4) made of a thermistor is provided between the radiator (9) and the drying drum (lO), and an outlet temperature detector (24) also made of a thermistor is provided on the outlet side of the drying drum (10). ) is provided.

・124 is the printed circuit board that constitutes the control circuit body.
).

FIG. 3 is a block diagram of the control circuit. 04 is a central processing bag V (in this embodiment, I
' Built-in A and M. Hereinafter, it will be abbreviated as CPU. ), 13
fil is a ROM that stores a program. C
ICs (3+1) and (31) for input/output expansion are connected to the PU (32), making it possible to handle output from a large number of people. The signals input to the CPU (3Zi) via these ICs (Sakaki and (31) are A/
Through the D converter (33), there are signals from the hot air temperature detector (33), the outlet temperature detector (12 = l), and the dryness adjustment knob (5), and also controls the operation course, time, temperature settings, and operation start/stop operations. signals from the keyboard switch (4) for the
32) from the reset circuit (35) and a signal from the external interrupt circuit output that generates a rectangular wave voltage at the power supply frequency for time measurement and inputs it to the external interrupt terminal of CPUO2. There is. On the other hand, the signal output from the CPU ('4) via the IC (30) and (311) is the fluorescent display tube (6) used to display time, etc.
signal to the fluorescent display tube (7) for temperature display, control to the A/D converter state (f1, drive signal to the W + air valve θ field, signal to the drum motor (18) There is a drive signal, a drive signal to the fan motor (+9) (No. X-) and a drive signal to the buzzer (38).

Next, the operation will be explained according to the flowchart shown in FIG.

First, when the power is turned on, the reset circuit (35) operates,
CPU (3a starts execution from the instruction stored in the start address of ROMC UQ, resets all outputs and at the same time clears the RAM area, including setting the temperature to 0, then starts at 50/60 Hz. Specification changeover switch (input the open/closed state of 3 funerals and select 59Hz specification or 60Hz
Determine the specifications. Then, the inlet temperature and outlet temperature of the drying drum (lO) and the setting values of the dryness adjustment knob (5) are read through the cpU (A2J) and A/D converter (g), and the time is read in by the fluorescent display tube (Gl (7)). The input of the keyboard switch (4) is checked while the temperature is displayed, and when there is an input, the corresponding processing is performed.Here, when the start key in the keyboard switch (4) is pressed, the running flag is turned on, When the stop key is pressed, all outputs are turned off and the running flag is turned off.

Next, check the status of the door switch, check whether the driving course has been set, and check the status of the driving flag.

When the door is closed, a driving course is set, and the driving flag is turned on, the driving state is entered.

Since time counting is an interrupt process by an external interrupt circuit (three forces), it is always executed as a separate process.

During operation, the exhaust blower (
I2) is constantly rotated, and the drum drive morph (18)
The drying drum (lO) is rotated for 15 seconds and stopped for 2 seconds.

The drying operation is completed by first performing a hot air operation for a set time, then performing a cold air operation for a predetermined time.

First, check whether or not the cold air operation is in progress. If the cold air operation is not in progress, check whether the hot air operation time has timed up. If the time has not expired, add the additional temperature to the hot air inlet temperature. Values and keyboard switches (4)
Compare with the target temperature set in . If the former is smaller than the latter, open the steam valve (13) to heat the air, otherwise close the steam valve (13) to stop heating.

Initially, the reheating temperature is set to O, so the hot air is heated to the set target temperature, and then heating is stopped. However, even if the steam valve (13) is closed, the hot air temperature still rises. Since the after-cooling temperature is 0, the steam valve 03)
The change in the inlet temperature after cooling is measured, the inlet temperature is detected just before it starts to fall after rising, and the difference between this temperature and the target temperature is set as the new after-temperature. As a result, from now on, the opening/closing control of the steam valve 03) is performed based on a temperature that is 4 J lower than the target temperature.

FIG. 5 shows this situation, where a is the aftercooling temperature. The hot air temperature is based on the target temperature only once.

When the hot air operation time has elapsed, the steam valve (13) is closed and a cold air operation is performed to send cold air to the clothes. When the predetermined cold air operation time has elapsed or the outlet temperature falls below 45°C, all outputs are turned off and the running flag is turned off.
End the drying operation.

(f) Effects of the Invention The clothes dryer of this invention controls the hot air temperature based on the value obtained by subtracting the reheating temperature from the target temperature, so that the thermal 1' applied to the clothes can be minimized. can do.

In addition, the aftercooling temperature fluctuates depending on the load, temperature, steam pressure, etc., but since the aftercooling temperature is measured every time it is operated, the aftercooling temperature is always appropriate and highly efficient.

[Brief explanation of the drawing]

Fig. 1 is a front view of one embodiment of the clothes dryer of the present invention, Fig. 2 is a side sectional view of the same, Fig. 3 is a control circuit diagram thereof, and Fig. 4 shows the operation of the control circuit shown in Fig. 3. The flowchart shown in FIG. 5 is a hot air temperature characteristic diagram of the clothes dryer shown in FIG. 1. FIG. 6 is a diagram corresponding to FIG. 5 in a conventional device. (+) - Clothes dryer, (4) Keyboard switch, (9) Radiator, (13) Steam valve (1
4)...Steam supply pipe, (22)...Printed circuit board,
Hot air temperature detector, ('12, CPU. Figure 1, Figure 83n)

Claims (1)

[Claims] ], an air heating means for heating the air sent to the clothes to be dried to make hot air, a hot air temperature means for detecting the temperature of the hot air and outputting a corresponding signal, and a target for outputting a signal corresponding to the target temperature of the hot air. It is equipped with a control means for controlling on/off the temperature means and the air heating means, and the control means controls the air heating means at the beginning of operation until the output of the hot air temperature means reaches the output of the target temperature means. Turn it on, turn it off after reaching it, and after turning it off, measure the maximum amount by which the output of the hot air temperature means exceeds the output of the target temperature means, that is, the amount of retardation. Clothes drying characterized in that the wind heating means is turned off while the value added with the amount of reheating exceeds the output of the one standard temperature means, and other gates are turned on. Machine.