JPS61263490A - 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 an automatic drying type clothes dryer for use in general households.

BACKGROUND OF THE INVENTION Conventionally, this type of clothes dryer has detected the temperature of the drying exhaust gas to determine when drying has ended. Namely.

The exhaust temperature rises from near room temperature at the start of drying to the temperature required for evaporation of moisture, and then a constant temperature is maintained as the supply of heat and the heat exhausted as steam are balanced (constant rate drying). ), and the amount of steam decreases and the supplied heat is exhausted as it is, so it rises. As can be seen from this characteristic, the end of the constant rate drying region can be confirmed by the rise in exhaust gas temperature, so this temperature rise was detected and the operation was stopped after a certain period of time delay.

Problems to be Solved by the Invention However, the conventional drying end determination method incorrectly detects when the exhaust temperature rises due to tangling of clothes in the constant rate drying region, and ends drying before it is completely dry. The present invention solves these conventional problems and provides a clothes dryer with improved dryness detection performance.

Means for Solving the Problems In order to achieve the above object, the clothes drying model of the present invention detects when the temperature change in the exhaust gas temperature within a certain period of time is greater than or equal to a specified value, and then detects when the temperature change within a certain period of time becomes negative. This configuration includes a sensor that cancels the detection when the sensor detects the sensor, and a control device that delays the detection by a predetermined time and stops the sensor.

Effects With the above configuration, even if the exhaust temperature once becomes high and the control device stops drying, if the temperature change becomes negative thereafter, the control device causes drying to be performed again.

EXAMPLE Hereinafter, an example of the present invention will be described based on the accompanying drawings.

In FIG. 1, an outer box 1 is provided with a drum for storing clothes and rotating the drum. 3 is a front plate that rotatably supports the front part of the drum 2 and is fixed to the outer box 1; 4 is the front plate of the outer box 1;
A heat source is fixed between the heater cover 6 and the front plate 3. Reference numeral 6 designates a fan that converts air into hot air through the heat source 4 and guides it into the drum to remove moisture from clothing and discharge it to the outside of the machine. Reference numeral 7 designates a sensor that detects the temperature of the exhaust gas.

Reference numeral 8 is a control device for controlling the heat source 4 and the motor 9 by detecting the temperature of the sensor 7. The motor 9 drives the drum 2 and the fan 6. 2 and the power is turned on, the heat source 4 is heated, and the motor 9 rotates the drum 2 and fan 6, and hot air enters the drum 2, absorbs moisture from the clothes, and is discharged to the outside of the machine.

At this time, sensor 7 detects the temperature of the exhaust gas. As shown in Figure 2, the temperature of the exhaust gas initially rises from near room temperature to the temperature required for evaporation of moisture, and then the heat supply and the heat exhausted in the form of steam are balanced, and the temperature remains constant. The temperature is maintained (
constant rate drying area). As the clothes dry, the amount of steam decreases and the supplied heat is exhausted along with the steam, causing the temperature to rise. By utilizing this point and sensing the temperature change ΔD over a certain time Δt, drying can be detected when the temperature change ΔD on a certain predetermined plate after the careful drying region is reached. Normally, after detection, it is necessary to slightly overdry to reduce uneven drying, and a so-called delay time is provided in which hot air is continued to be blown for a certain period of time. Depending on the type and amount of clothing, the cloth may become tangled or unravel while driving carefully. At that time, if the cloth gets stuck, the hot air will not diffuse sufficiently into the clothes, resulting in hot air! The temperature of the exhaust air rises rapidly as a portion of the air is discharged, but once the hot air is separated, the hot air is dispersed and removes the moisture from the clothing, causing the temperature to drop (Part A in Figure 2). However, if the clothes dry and the temperature rises, the temperature will not come down unless you turn off the heat source. Therefore, even if △D exceeds a predetermined value, it will drop immediately thereafter, that is, △D
If the detected value is canceled once the value becomes negative, it is possible to prevent false detection that the dry state is dry due to cloth.

Effects of the Invention As is clear from the above embodiments, the clothes dryer of the present invention detects once when the temperature of the exhaust gas exceeds a certain temperature difference from a state where there is little change within a certain period of time, and then The dryness detection performance can be improved by canceling detection when the temperature change within a certain period of time becomes negative, and stopping after a predetermined delay if the temperature change within a certain period of time after detection is positive. be.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a clothes dryer showing an embodiment of the present invention;
FIG. 2 is a characteristic diagram showing exhaust temperature and operating time. 2...Drum, 4...Heat source, 6...
...Fan, 7...Sensor, 8...
·Control device.

Claims (1)

[Claims] A drum for rotating clothes, a heat source for drying clothes, and a fan for guiding and discharging heat from the heat source into the drum.
The drum is equipped with a sensor that detects the temperature of the exhaust gas from the drum, and the sensor detects when the temperature of the exhaust gas changes within a certain period of time is greater than or equal to a specified value, and the temperature change within the subsequent period of time becomes negative. A clothes dryer having a control device that cancels the detection at certain times, delays the detection for a predetermined period of time, and then stops the clothes dryer.