JPS6182799A - Control 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 Application of the Invention] The present invention relates to a clothes dryer, and particularly to control of intermittent operation of a heater suitable for controlling the temperature of finishing hot air for clothes.

[Background of the invention]

The temperature of hot air in conventional Whirlpool dryers in the United States was controlled using a temperature adjustment thermostat that detected the exhaust temperature. (In the attached wiring diagram example, LTl, MT+, H
(3 types of T+) This method aims to keep the temperature below a certain level at any point during the operating process, and does not take into account the point of controlling the temperature depending on the degree of dryness of the clothes. Therefore, when the room temperature is high, the theme is activated at the beginning, and the drying time is lengthened due to the intermittently wasted air blowing operation time.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a clothes dryer that operates intermittently in the evening after reaching a certain level of dryness.

[Summary of the invention]

The present invention uses a humidity sensor installed in the main body to turn the heater ON and OFF after reaching a certain degree of dryness, and outputs an output signal to perform intermittent operation of the heater to adjust the degree of dryness of the clothes. In addition to providing warm air according to the
This allows efficient drying operation by eliminating wasted operating time during the initial operation of the dryer in the case of conventional temperature control.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG.

Outer frame 1. A true lid 8 having an outer frame pace 7 and an intake hole 8-1
Inside the box body, there is a drum support 12 fixed to the outer frame 1 and having a slider 12-1, and a drum support 9-2 of a heater case 9 in which a heater 10 is mounted via a heater support 11. A drum 3 containing a heat insulating plate 3-1 on the back is rotatably supported.

A filter 5 is installed on the drum 3 side of the exhaust port 12 - 2 of the drum support 12 to collect lint generated from clothing. -1, is guided to the blower 6 having a fan 6-2, and is discharged outside the machine via the exhaust pipe 14.-15 is a belt that transmits the rotation of the motor 6-1 to the drum 3; The upper part is panel 4 with control equipment 4-2 attached.
A top cover 4 with -1 is attached.

16 is a humidity sensor that detects the degree of dryness, and 17 is a temperature adjustment thermostand that adjusts the exhaust temperature.

FIG. 3 shows the details of the panel part of the present invention, and there are the following four types of temperatures selected by SW7.
Each is appropriately selected depending on the type of clothing.

a, High...Standard clothing such as cotton, Med
...i: -Manentophres C, Low ...
For clothing made of heat-resistant fibers such as chemical fibers, the temperature of hot air applied to the clothing is lower in the order of a, b, and c.

Air in d is an air blowing operation and is an operation in which the heater is not turned on, so it is not related to the intermittent operation of the heater of the present invention.

Here, the present invention relates to items a, b, and c above.

Intermittent ON-OFF operation of the heater will be explained.

Figure 4.5.6 is a diagram showing the relationship between drying time, humidity sensor resistance value, dryness of clothes, and exhaust temperature.Usually, a clothes dryer that uses a humidity sensor and uses an automatic operation termination method The control method is based on the fact that the points 81, 82 and 83 in Figure 6, when the temperature sensor changes significantly after operation, are from a damp state like ironing clothes to a normal dry state. After detecting the resistance value of the temperature sensor at 81, 82, and 83 points, cool down operation (
The configuration is such that the air blower starts (air blowing operation) and then stops.

Figure 4 shows the exhaust temperature at that time.Up to X hours, the exhaust temperature is almost constant (constant rate drying interval °), and after X hours, the temperature starts to rise. It will be like that. (
In the constant rate drying zone, moisture is contained in the clothes, so even if the temperature of the hot air applied to the clothes is high, it has little effect on the clothes, but in the constant rate drying zone, moisture is contained in the clothes. As the moisture content decreases, the temperature of the clothing fibers increases, which affects fibers that are sensitive to heat, and when they are extremely affected,
It causes shrinkage and discoloration of clothing.

If you control the temperature from the point when the clothes contain a lot of moisture, the air blowing time will be added and the drying time will become longer. ON-OFF operation shortens the drying time the most, and the effect of warm air on the clothes is also appropriate.

In the present invention, we focused on this point, and after detecting this drying point with a humidity sensor, the microcomputer turns on the heater.
In this embodiment, which outputs a -OFF signal to cause the heater to operate intermittently, the High temperature is a temperature that must not exceed this temperature during the normal drying cycle, so safety is taken into account. The temperature is adjusted using a temperature adjustment thermostat number 17, and the heater is operated intermittently for Med and LOW.

Med from the point of entering lapse rate drying (drying rate of about 90 cm)
, For low temperature control, heater ON-OF
F control is performed, and FIG. 1 shows the relationship between time and temperature.

Assuming that the temperature of Med is about 5C lower than the temperature of High, and the temperature of Low is about 5C lower, the microcomputer outputs the ON/OFF output of the heater. - Continue the OFF operation until drying is completed.

High, Med, and Low are classified based on the exhaust temperature, and this temperature is a temperature value determined by approximately converting the average @air temperature given to the clothing to the exhaust temperature depending on the type of fiber of the clothing.

By the way, the humidity sensor detects the point of ON/OFF operation of the heater, but since the relationship between the resistance value of the humidity sensor and the degree of dryness is different between the rated load and the small load, it is necessary to detect the point in time when the heater is turned ON and OFF. This is classified based on the resistance value of the humidity sensor, and since the amount of load differs, there will be a difference in the temperature rise of the exhaust gas, so in this example, the Me
d.

The heater is in intermittent operation at LOW.

The intermittent operation time of the heater depends on the rated load of the clothes dryer,
It varies depending on heater input, expected temperature, etc.
An ON-OFF chart and an overall flowchart of an embodiment of the present invention are shown in FIG. 7.8.

The circuit diagram is shown in figure tg9.

The humidity sensor 16 also detects when it is time to turn the heater on and off using PDI to PD3, and outputs an intermittent operation output to the heater as shown in Figure 8, which is pre-installed in the software, to the PG2 boat. This is to perform the main heater control.

18 is a power switch, 19 is a door switch, and 20 is a triac.

21 is a microcomputer used in this embodiment.

〔Effect of the invention〕

As described above, according to the present invention, after the degree of dryness is detected by the humidity sensor, the heater is operated intermittently according to the rated and small load output signals built into software in the microcomputer, thereby achieving an appropriate finishing hot air temperature for the clothes. In addition to obtaining
Eliminate wasted air blowing operation time during the drying operation cycle,
In addition, multiple systems that traditionally controlled temperature (Med, Lo
w) The thermostat can also be abolished, improving performance and improving performance.
It is also effective in simplifying the configuration and reducing costs by eliminating parts.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the relationship between drying operation time and exhaust temperature during heater ON-OFF cycles. FIG. 2 is a side sectional view of the clothes dryer according to the present invention. FIG. 3 is a display panel of the clothes dryer according to the present invention. FIG. 3 is a diagram showing the relationship between the degree of dryness of clothing and the resistance value of a humidity sensor. FIG. 7 is a flowchart regarding heater ON-OFF operation, and FIG. 8 is a flowchart regarding heater ON-OFF operation.
An example of an OFF chart. FIG. 9 is a circuit diagram of a dryer according to the present invention. 16... Humidity sensor, 17... Temperature adjustment thermostat, IO... Heater, 21... Microcomputer. False g times and -7ON-θFF+FF top yltRLtJri Dlucid AI'l Lu-
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Claims (1)

[Claims] 1. In a clothes dryer that sends hot air into a rotating drum to dry the clothes inside the drum, a humidity sensor installed inside the dryer detects the degree of dryness, and after a certain level of dryness is reached, the heater is turned off intermittently. 1. A method of controlling a clothes dryer, characterized in that an ON-OFF output signal is given to a heater so as to operate it.