JPS59200700A - 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 [Technical Field of the Invention] The present invention forms a hot air circulation path using a nine-rotation drum, a circulation fan, a heating fan, and a heat exchanger.

By cooling the heat exchanger, moisture from the clothes stored in the rotating drum is condensed and recovered. This paper relates to the improvement of a device for detecting the degree of dryness of dried objects in a so-called dehumidifying type clothes dryer. 70300 is a sectional view showing a conventional clothes dryer shown in FIG.

In the figure, +1+ is an outer box, (21 is a drum rotatably supported inside the outer box fil, and is driven by a motor (5) via a drum bell H31%. (5) is installed at the rear of the drum (2). The exhaust duct is equipped with a circulation fan (
6) in the device N, this circulation fan (61 is the fan bell)
It is rotationally driven by a motor (4) via 1 f71%.

(8) is a heat exchanger whose one end is connected to the intake duct (5) and the other end is connected to the intake duct (9). Is αO within the intake tact (9) due to the heater? This is installed and the drum (2)
, heating the air in the circulation path formed by the exhaust tact (5), the heat exchanger (8) and the intake duct (9). I
is installed near the heat exchanger (8) and transfers outside air to the heat exchanger (8).
) is a cooling fan that completely cools the heat exchanger (8) by blowing air, and is rotationally driven by a motor (4) via a fan belt 2G2. Q31 is a drain pipe installed at the bottom of the intake duct (9) to discharge the water (hereinafter referred to as dehumidified water) condensed by the heat exchanger (8) to the outside. An electrode I for detecting the presence or absence is provided. Q51 is a door that handles the clothes input slot on the front side of the outer box (1).

In the clothes dryer shown in Fig. 1, when drying is started by putting the items to be dried in the drum (2), the drum (2) is powered by the motor (4) via the drum bell (31-'FE-). Therefore, it rotates around the horizontal axis. At the same time, the motor (4
A circulation fan (6) and a cooling fan (
11) operates, the circulation fan (6) sucks the air in the drum [2], and blows it back into the drum (2) via the exhaust duct H51, the heat exchanger (8), and the intake duct (9). Circulate the air so that (Hereinafter, this air will be referred to as circulating air.) At this time, the circulating air heated by the heater aαl in the intake duct (9) evaporates moisture from the material to be dried that has been put into the drum (2). Therefore, drum (2)
The air flowing out becomes hot and humid. On the other hand, the cooling fan (11) takes in outside air and blows it to cool the heat exchanger (8). When the high-temperature and humid air passes through the heat exchanger (8), it is dehumidified by heat exchange with outside air, and the dehumidified water is discharged to the outside from the drain pipe 113+.

FIG. 2 is a block diagram showing the control system W of the clothes dryer shown in FIG. 1. In FIG. 9, the same reference numerals as in FIG.
. (support) is a judgment circuit 9 that inputs the detection signal from the electrode H and judges the presence or absence of dehumidified water.The output of the judgment circuit 9 is a timer (
211 is connected. The timer el11 stops the supply of the motor (4) and the heater (9) after a certain period of time when the determination screen head determines that the dehumidified water has run out.

Next? The operation of the clothes dryer having the above structure will be explained with reference to a drying characteristic diagram shown in FIG. FIG. 3 shows the dryness of clothes and the amount of dehumidified water with respect to the drying time. In FIG. 1, the graph indicated by A shows the dryness of the clothes, and B shows the change in the amount of dehumidified water per unit time. After the dryer starts operating, dehumidified water will begin to be discharged outside a few minutes later. When the degree of dryness exceeds a certain value, the amount of dehumidified water becomes constant, and as the drying progresses and the degree of dryness approaches, the amount gradually decreases and finally reaches zero.

However, at this point, the clothes are not yet dry.

When the dehumidified water passes through the drain pipe Q3, the electrode α sends a signal to the determination circuit ■. Since the dehumidified water intermittently flows out through the drain pipe a, the signal becomes a pulse.

When the determination circuit (a) determines that there is no longer a detection pulse from the electrode (141), it activates the timer Qυ.

When the timer 〇〇 measures the preset time t, it stops power supply to the motor (4) and the heater aω, and ends the drying operation.

As described above, in the conventional apparatus, the drying operation is stopped after a predetermined period of time has elapsed after determining the presence or absence of dehumidifying water and detecting that the dehumidifying hydraulic power 5 has been exhausted. However, the time from when the dehumidifying water runs out until the finished dryness is reached varies depending on the amount of clothing. For this reason.

There are drawbacks such as overdrying or insufficient drying depending on the amount of clothing.

[Purpose of the invention]

This invention was made to eliminate the above-mentioned conventional drawbacks, and provides a clothes dryer that can accurately detect the degree of dryness of the object to be dried, which is affected by the amount of the object to be dried. The purpose is to! :do.

[Embodiments of the invention]

FIG. 4 is a sectional view of a clothes dryer according to an embodiment of the invention, and FIG. 5 is a block diagram showing a clothes dryer control device according to an embodiment of the invention. (To) is a temperature detector installed in the exhaust duct (5) to detect the temperature of the circulating air.
It is connected to the. (36) is a timer that measures a certain period of time from the start of drying, and its output is connected to the integration circuit (3).The comparator (32) is connected to the detection signal of the temperature detector (7) and the integration circuit (31). An integral signal is input and the magnitude relationship between the two is compared.A motor (4) and a heater shaft are connected to the output end of the comparator (32).

Next, the operation will be explained with reference to the characteristic diagram shown in No. 6-. 6th
The figure shows the temperature detection signal of the temperature detector (to) and the integral signal of the integrating circuit (31) with respect to the drying time. The graph shown at A1 in the figure is the temperature detection signal when there is a small amount of clothes to be dried. This corresponds to the temperature characteristics of the circulating air in the exhaust duct (5). Characteristic A2 indicated by a broken line indicates the integral signal at that time. Talented. B1 is a temperature detection signal when there is a large amount of clothing, and B2 is an integral signal.In the beginning, the heat supplied from the heater (II) is used as sensible heat to raise the temperature of the moisture that permeates through the clothing. After that, the clothes dry over time, but the temperature of the circulating air does not change because the heat is consumed as latent heat. Eventually, when the degree of dryness approaches 100%, the heat is consumed again as sensible heat. Therefore, the temperature of the circulating air rises rapidly.During the time T measured by the timer (33) from the start of drying, the integral circuit (33) is not activated.
The integrated signal of the temperature detection signal over time shows the same value. Even after the drying progresses, there is no change in the temperature of the circulating air, so the two values show the same value. Then, as the drying approaches the end, the temperature of the circulating air increases and a difference is detected between the temperature detection signal and the integral signal. The rate of change in the temperature of the circulating air increases for the characteristic A1, which has a small amount of clothing, than for the characteristic B1, which has a large amount of clothing, and is inversely proportional to the amount of clothing. Also,
The rate at which the integral signal follows the circulating air temperature will depend on the rate of change of the temperature detection signal; that is, the smaller the amount of clothing, the greater the difference between the temperature detection signal and the integral signal. On the other hand, if finish drying is defined as the point in time when the degree of dryness of the clothes reaches 100%, the finished circulating air temperature increases as the amount of clothes increases. From this, it is possible to indirectly detect the degree of dryness of clothing by selecting the integration time constant of the integration circuit (3) appropriately, based on the signal difference between the temperature detection signal and the integral signal. If you set the signal difference △t at the time, the rate of change in the circulating air temperature is large in the case of a small amount of clothing, so the circulating air temperature is low when the difference between the detected temperature signal and the integral signal reaches the set signal difference △t. Conversely, when the amount of is large, the temperature of the circulating air that reaches the set signal difference Δt becomes high.

The comparator (32) calculates the difference between the temperature detection signal from the temperature detector (to) and the integral signal from the integrating circuit (6) as the set signal difference △t.
When they match, the power supply to the motor (4) and heater (1) is stopped, and the operation of the clothes dryer is ended.

By the way, in the above explanation, the temperature sensor C31 is connected to the exhaust duct (
51, but the above-mentioned operation can be expected if it is installed in a circulating air passage such as the intake tact (9).

Further, in the above embodiment, the operation of the clothes dryer is terminated immediately after finish drying is detected, but the power supply to the heater 01 may be completely stopped and cold air operation may be performed.

〔Effect of the invention〕

As explained above, this invention utilizes the fact that the temperature of the circulating air during finishing and the rate of change at that time is correlated with the amount of material to be dried. A temperature detector is used to detect the temperature, an integration circuit that integrates the detection signal from the temperature sensor with a predetermined time constant, and a comparator that compares the detection signal of the temperature detector and the integral signal from the integration circuit. This is because the degree of dryness of the material to be dried is detected.

It is possible to provide a clothes dryer that can accurately detect the degree of dryness of objects to be dried regardless of the amount of objects to be dried, and can end its operation with a certain level of finished drying.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional clothes dryer. Fig. 2 is a block diagram showing the control device, Fig. 3 is a characteristic diagram showing the relationship between dryness and dehumidifying water amount with respect to drying time, and Fig. 4 is a cross section showing a clothes dryer according to an embodiment of the present invention. FIG. 5 is a block diagram showing an embodiment of a control device for a clothes dryer according to the present invention. FIG. 6 is a characteristic diagram showing the circulating air temperature detection signal and integral signal with respect to drying time. (11 is the outer box, (2) is the drum, (5) is the exhaust duct, (6) is the circulation fan, (8) is a heat exchanger, (9) is an intake duct. (101 is a cooling fan, α fist is a temperature detector, (31
) is an integrating circuit, (32) is a comparator, and (33) is a timer. Agent Masuo Oiwa 1st Figure 12j1 1υ Figure 3 Figure 4

Claims (1)

[Claims] (11. A rotatable drum is provided inside the main body. 2. Heated air is supplied into the drum, and the high-temperature and humid air exhausted from the drum is recirculated through a heat exchanger. A dehumidifying type clothes dryer having a structure in which a circulating air path is formed so as to be heated by the heat source, and outside air is perpendicularly crossed in the heat exchanger by the circulating air path and the cooling fan,
a temperature detector installed in the circulating air passage to detect the temperature in the circulating air passage; an integrating circuit that integrates a detection signal from the temperature detector with a predetermined time constant; and a detection signal from the temperature detector. A comparator that compares the A11 minute signal from the integrating circuit and a clothes dryer that compares the A11 minute signal from the integrating circuit. (2) The detection signal from the temperature tW detector and the integral signal from the integrating circuit. The clothes dryer according to claim 1, characterized in that the operation of the clothes dryer is stopped when a predetermined relationship is reached.The detection signal from the temperature sensor and the integral signal from the integration circuit. The clothes dryer according to claim 1, characterized in that the clothes dryer operates with cold air for a desired time after reaching a predetermined relationship. The clothes dryer according to any one of claims 1 to 3, characterized in that the clothes dryer does not operate until the detected temperature continuously reaches a substantially constant temperature ζ.