JPS64236Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a clothes dryer for use in general households.

Conventional Structure and Problems Conventionally, this type of clothes dryer detects a predetermined drying level of the drying object by contacting the object to be dried and its electrical resistance, and from that point on, the temperature detection element detects the dryness of the object. The hot air drying operation is stopped after calculating and controlling the delay time due to the temperature rise of the internally circulating hot air.
Temperature rise detection was inconsistent and varied widely depending on the mounting position of the temperature detection element, making it impossible to always maintain a constant finished state.

Purpose of the invention The present invention solves these conventional problems and provides a clothes dryer that can ensure a uniform finish.

Structure of the invention The clothes dryer of the invention has a means for drying the air with heated hot air and bringing it into contact with the object to be dried, and detecting a predetermined drying level of the object to be dried by the electric resistance of the air, and and a means for stopping the hot air drying operation after calculating and controlling the delay time by the temperature rise of the circulating hot air in the refrigerator from the time when the temperature detecting element It is installed in the front ventilation passage, and the drying finish state is uniform during the delay time.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

In the drawings, reference numeral 1 denotes a rotating drum serving as a drying chamber, which is rotatably supported within an outer box 2, and its rotation causes the material to be dried 3 inside to rotate and fall. Reference numeral 4 denotes a motor provided in the outer box 1, which rotates the rotary drum 1 via a belt 5, and also drives a dehumidifying fan 8 in the fan case 7 via a belt 6.
(hereinafter referred to as the fan) are rotated at the same time.

When the fan 8 is rotated, the air in the rotating drum 1 is sent from the filter cover 9 through the filters 10 and 11 as shown by the arrow, through the fan case 7, and into the heater cover 13 through the ventilation passage 12. , a heater 1 installed inside the drum front plate 14
5, the hot air is blown into the drum 1 through the ventilation holes 19. After the hot air warms the material to be dried in the rotating drum 1, the hot air that has removed moisture repeats the above-mentioned ventilation cycle. During the hot air circulation cycle, the hot air containing a large amount of humidity is transferred to the drum 1 of the fan 8.
Touch the inner wall on the side.

At that time, the outside air is also touching the wall on the outside air side of the fan 8, so due to the temperature difference at that time, the water vapor in the hot air condenses on the inside wall of the fan 8.
Water droplets blown away by the rotation of the fan case 7 are drained out of the machine through a drain hole 16 provided in the fan case 7. By repeating the above-described cycle, water is removed from the material to be dried, and the material to be dried 3 in the drum 1 is dehumidified and dried.

An electrode 17 is attached in front of the heater 15 and on the side of the drum front plate 14 facing the rotary drum 1, in order to come into contact with the material 3 to be dried and detect its electric resistance.

Reference numeral 18 denotes a temperature detection element, which is composed of a thermistor having negative resistance-temperature characteristics, and is installed in the ventilation path before reaching the heat exchange section between the filters 10 and 11 in the rotating drum 1 and the fan 8 to dehumidify. provided to detect the previous temperature.

Therefore, the material to be dried 3' in the rotary drum 1 is dried by hot air drying as described above, a predetermined drying rate is detected by the electrode 17, and the subsequent temperature rise ΔT (Fig. 3) is calculated as the temperature. The delay time is measured by the detection element 18 and calculated, and as a result, it is controlled by a control circuit that turns off the power.

The operation of the above configuration will be explained below. The temperature detection element 18 that detects the temperature is placed in the heat exchange section, that is, in the ventilation passage before it comes into contact with the fan 8, so it is at a position close to the temperature inside the refrigerator.
In addition, the temperature of the hot air can be measured at a position where the influence of turbulence caused by the fan 8, condensed water during heat exchange, and outside air temperature is minimized, and the temperature detection element 1
In addition to improving the detection accuracy of 8, by performing temperature detection in the above-mentioned state, calculations and input values can be performed accurately, delay time can be made more accurate, and the finished state can be made uniform.

Effects of the Invention As described above, the clothes dryer of the present invention has a means for detecting a predetermined drying level of the drying object by contacting the object to be dried based on its electrical resistance, and a temperature detection element to detect the dryness level from when the drying level is reached. A means for stopping the hot air drying operation after a predetermined period of time has elapsed, and the temperature detection element is provided in the ventilation path before reaching the heat exchanger, so that the hot air drying operation is always stopped in a constant state and the finish is uniform. It is something that can be done.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a clothes dryer according to an embodiment of the present invention, FIG. 2 is a control circuit of the same clothes dryer, and FIG. 3 is a change diagram of drying rate and exhaust temperature. 3... Material to be dried, 8... Fan, 18... Temperature detection element.

Claims (1)

[Scope of utility model registration request] A means for detecting a predetermined drying level of the drying object by contacting the drying object by its electrical resistance; and a means for detecting a predetermined drying level of the drying object by detecting the predetermined drying level; 2. A clothes dryer, comprising means for determining a delay time from when a dryness level is detected to when a hot air drying operation is stopped, and wherein the temperature detection element is provided in a ventilation path at a stage before reaching a heat exchange section.