JPS6198299A - Controller of 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 relates to a device for drying clothes while stirring them in a rotating drum, and more particularly to a control device for a dryer configured to automatically detect the completion of drying.

[Technical background of the invention and its problems]

Conventionally, hot air is supplied into a rotating drum driven by a motor to dry the clothes inside, and the completion of drying of the clothes can be automatically detected.

The detection methods include cloth resistance detection method and exhaust temperature detection method. The former method utilizes the fact that the cloth resistance changes depending on the degree of dryness, but the apparent cloth resistance detected changes depending on the type of cloth and the contact pressure between the electrode and the cloth, that is, the amount of cloth. There is a concern that this results in large variations in the degree of dryness.

On the other hand, the latter method utilizes the characteristic that the exhaust temperature rises rapidly near the completion of drying, but has the disadvantage that the temperature state is easily influenced by the ambient temperature and the amount of cloth.

[Purpose of the invention]

The present invention has been made to eliminate the above-mentioned drawbacks,
The purpose is to provide a dryer control device that can provide a stable drying effect that is not affected by ambient temperature, amount of cloth, or type of cloth.

[Summary of the invention]

In the ilJ# installation of the dryer according to the present invention, in order to detect the weight ω of clothes during drying, a heavy water detection element is provided on the bearing of the rotating drum or the legs of the main body, etc., and the weight is determined by the detection signal from this weight detection element. The completion of drying is determined by sequentially calculating the rate of change over time.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is an outer box, and a rotating drum 2 is provided inside the outer box, and this rotating drum 2 is rotatable via a front bearing 3 and a rear bearing 4 at an appropriate stationary part inside the outer N1. is supported by This rotary drum 2 is rotated together with a fan 6 by a motor 5.

This fan 6 constitutes a hot air supply device 9 (i.e., the outside air is sucked in by the rotation of the fan 6) together with a heater 8 made of, for example, a positive temperature coefficient thermistor.
When introduced into the rotating drum 2 via the air lower, it is hot-aired by the heater 8, passes through the rotating drum 2, and is discharged outside the machine via the exhaust duct 10. Arrow 11 indicates the flow of wind at this time. Further, the outer box 1 has a clothing entrance/exit 12 facing the inside of the rotating drum 2, which is opened and closed by a door 13. Now, in the above dryer, in order to detect the weight of the clothes stored in the rotary drum 2, two weight detection elements 14 are installed, for example, between the front bearing 3 and the rear bearing 4, the weight of the rotary drum 2 is determined. It is interposed and provided on the inner circumferential side of the upper half to which it is applied.

Next, the electrical configuration will be explained along with its operation.

First, for convenience of explanation, the elapse of the drying time T, the weight M of the clothing, and the weight change rate m will be explained with reference to FIGS. 3 and 4. First, when the motor 5 and the heater 8 start being energized, that is, during the heating period T+, the evaporation rate gradually increases, but eventually shifts to a constant rate drying period T2 in which the evaporation rate is constant. When this period T2 continues for a while, the amount of moisture contained in the clothes decreases and the evaporation rate gradually decreases, leading to a lapse rate drying period T3. During the constant rate drying period T2, the evaporation rate, that is, the evaporated fleas per unit time is constant, so the decreasing slope of the weight IM of the clothing is constant as shown in Figure 4, and therefore the weight change rate is as shown in Figure 3. m indicates a constant value of +01. On the other hand, when entering the lapse rate drying period T3, as shown in FIG. 4, as the evaporation rate decreases, the gradient of decrease in the weight IM of the clothing suddenly becomes more gradual compared to that during the constant rate drying period T2. Therefore, the weight change rate m gradually decreases from ml as shown in FIG.

Next, drying completion control using the characteristics of weight change rate will be explained with reference to FIG. In FIG. 2, a control circuit 15 is configured to control energization/disconnection of the motor 5 and heater 8, and a weight detection circuit 16 is configured to include the weight detection element 14. The weight detection circuit 16 receives the timing signal S5 from the time signal generation circuit 17, for example, as shown in FIGS.
As shown with ..., it is supplied at predetermined fixed time intervals. As a result, the control circuit 15 stops the rotating drum 2 for a predetermined short period of time by cutting off the power to the motor 5 every time it receives the timing signal S after the start of the drying operation, and during this period, the weight detection circuit 16 detects that the rotating drum 2 is stationary. The weight of the rotating drum 2, and therefore the weight of the clothing, is detected by the weight detection element 14 under the condition that no extra kinetic inertia is acting, and the weight detection signal S2 is sent to the rate of change calculation circuit 18.
give to This change rate calculation circuit 18 sequentially calculates the weight change rate from the weight detection signal S2 given at regular intervals,
The values are sequentially applied to the drying rate judgment circuit 19. This drying rate judgment circuit 19 calculates the weight change rate given from the change rate calculation circuit 18 to a predetermined set value. (See FIG. 3), and when the drying completion signal S3 is lowered to this set value ll1o, a drying completion signal S3 is given to the control circuit 15. Upon receiving this drying completion signal S3, the control circuit 15 performs desired operation stop control, such as continuing the drying operation for replenishment for a predetermined period of time, then switching to cold air operation, and then stopping the operation. .

It goes without saying that the present invention is not limited to the above embodiments. That is, as the heavy water detection element, a weight detection blocker may be interposed in the leg of the dryer main body, and the rotating drum may be stopped as necessary when detecting the weight. Further, the dryness degree determination control based on the weight change rate as described above may be activated after detecting by some means that the dryness of the clothing has reached a predetermined level.

In the above description, the rate of change in weight when outputting the drying completion signal does not necessarily mean that the rate of change is zero, but only that it is a rate of change that corresponds to the target degree of dryness.

〔Effect of the invention〕

As described above, the present invention is configured to judge the degree of dryness, such as completion of drying, based on the weight change rate as the clothes dry.The weight change rate does not change depending on the type of cloth, base, or ambient temperature. Drying (67 “g @ 0” * Cj5
Gt 6 n'j! lj 1K @E kt'
)3e"1j, and therefore a stable drying effect can be obtained.

[Brief explanation of the drawing]

The drawings relate to one embodiment of the present invention, in which Fig. 1 is a schematic vertical view of the dryer, Fig. 2 is a block diagram of electrical components, and Figs. 3 and 4 are graphs showing the drying time. It is a characteristic curve diagram showing the weight change rate of clothing and the heavy color change of clothing. In the figure, 2 is a rotating drum, 9 is a hot air supply device, 14 is a weight detection element, 15 is a control circuit, 16 is a weight detection circuit, 17
18 is a time signal generation circuit, 18 is a change rate calculation circuit, and 19 is a drying rate determination circuit. Applicant Toshiba Corporation Figure 1 Figure 2

Claims (1)

[Claims] 1. In a device that supplies hot air into a rotating drum to dry clothes stored therein, it includes a weight detection circuit including a detection element that detects the weight of the rotation drum, and a detection signal from the weight detection circuit. a calculation circuit that calculates a weight change rate as the clothes dry, and a determination circuit that outputs a drying completion signal when the weight change rate reaches a predetermined value;
A control device for a dryer, characterized in that a desired operation stop control is performed based on the drying completion signal.