JPS59197297A - 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 Field of Industrial Application The present invention is applicable to the type and amount of clothing, voltage fluctuations, ambient temperature fluctuations,
The present invention relates to a control device for a dryer that can obtain a preferable dry finish condition in accordance with the heater capacity.

Conventional configurations and their problems Currently, the most commonly used dryers use a method of drying by manually setting a timer for one hour, but this method does not affect the user's experience. Since the above timer is set for one hour based on this, under-drying or over-drying tends to occur.
In the case of over-drying, energy is wasted, and in the case of under-drying, it is necessary to set the timer for one hour again, which is inconvenient in terms of usability.

Another possible method is to obtain a preset delay time from a predetermined drying level, but there is a problem in that the user must decide on the above set time depending on the type and amount of clothing. .

OBJECT OF THE INVENTION The present invention solves the above-mentioned conventional problems.The present invention aims to adjust the temperature of the atmosphere inside the drum, the temperature of the exhaust air from inside the drum, and the temperature inside the drum according to the type and amount of clothing, voltage fluctuations, ambient temperature fluctuations, and heater capacity. relative humidity, relative humidity exhausted from inside the drum,
The electrical resistance of clothing changes as the drying time passes,
Since the change is closely related to the drying level of the clothes, the dryer control device detects the drying level at two points, sets a delay time corresponding to the required time, and obtains a good dry finish. The purpose is to provide.

Structure of the Invention The present invention is a dryer control device that detects two dryness levels using a dryness level detection means that detects the dryness level of clothes, and sets a delay time corresponding to the required time. By controlling the operating time according to the change in time between drying levels, it is possible to automatically obtain a good drying state.

DESCRIPTION OF EMBODIMENTS The present invention will now be described in detail. FIG. 1 is a block diagram showing the configuration of an embodiment, in which numeral 1 denotes dryness level detection means for detecting the dryness level of clothing. Reference numeral 2 denotes a dryness level determination means, into which the output of the dryness level detection means 1 and the output of the storage means 3 are input. Here, the storage means 3 stores data regarding the dryness level, data regarding changes thereof, data for driving the heater and motor for a predetermined period of time in accordance with changes in the dryness level, and the like.

The outputs of the dryness level determining means 2 and the storage section 3 are both input to the control means 4. The control means 4 controls the heater drive means 5 to control power supply to the heater. Then, the motor drive means 6 is controlled to control the power supply to the motor. The control means 4 supplies power to the motor and heater to perform hot air drying, and the drying level determining means 2 detects a change in the drying level based on the output that indicates that the drying level has reached an inflection point. The heater and the motor are supplied with power for a predetermined period of time.

FIG. 2 shows a specific configuration of this embodiment, in which a temperature detection element is used as the dryness level detection means. In the figure, reference numeral 7 denotes a rotating drum serving as a drying chamber, which is rotatably supported within an outer box 8, and its rotation stirs the material to be dried 9 inside p.

Reference numeral 10 denotes a motor provided at the lower part of the outer box 1, which rotates the rotary ram 7 via a belt 11, and also rotates a fan 13 within a fan case 12 via the belt 11. When this fan 13 is rotated, outside air is sucked into the outer box 8 through the intake port 14, and a drum front plate 15 which is disposed on the front surface of the rotating drum 7 and fixed to the outer box 8
The hot air is turned into hot air by the heater 16 for generating hot air inside, and is supplied into the rotating drum Y from the vent portion 15a of the drum front plate 150. Then, the hot air that has removed moisture from the dried material 9 in the rotating drum T is transferred to the filter cover 17 and the filter 1.
8. The air is discharged out of the outer box 8 through the ventilation port 7a provided on the rotating drum 7 and the ventilation port 12a of the fan case 12. In this way, the material to be dried 9 in the rotating drum 7 is dried with hot air.

1a (l-i7a) A thermistor having a negative resistance-temperature characteristic, which is a degree detection element, is used to detect the temperature of hot air discharged from inside the rotating drum 7, that is, the exhaust temperature, for example.
It is provided in the exhaust passage section of the fan case 12.

Reference numeral 19 denotes a microcomputer, which determines the temperature based on a built-in program and generates signals for driving the heat and motor, respectively.

Specifically, a storage section 19a that stores temperature data, etc., an input section 19b that inputs the output of the temperature detection element 1a, an output section 19C1 that outputs control signals to the heater drive means 5 and the motor drive means 6; section 19a, input section 19b
, and an arithmetic control section 19d that controls the output section 19c and performs data comparison operations.

By the way, when the dried material 9 in the rotary drum Y is dried by hot air drying as described above, the exhaust temperature detected by the thermistor 1a and the drying rate of the dried material 9 change over time as shown in FIG. It has been experimentally shown that. In Fig. 3, the preheating period 14 and 11 is required for damp clothes and the temperature rise in the cabin, and although the temperature rises rapidly, it hardly contributes to drying the clothes 9 and -. It is a period.

Period B 1iJJ is a constant rate drying period in which the moisture contained in the clothes begins to evaporate steadily, and although the width is approximately constant, it is a period in which the drying of the clothes progresses rapidly. Period C is the final stage of drying, and the moisture content in the clothes has decreased.
This is a period in which the temperature begins to rise and the drying of clothes progresses slowly.The more clothes there are, the smaller the changes in temperature during this time, and the thicker the types of clothes, the more the changes in temperature will be smaller. It has been experimentally revealed that the lower the ambient temperature, the smaller the change, and the smaller the heater capacity, the smaller the change. In other words, the time required for the exhaust gas temperature at two points T1 to T2 (Δt
), a good dry finish can be obtained by setting the delay time (t2) accordingly.

When the dryness level detection means 1 is replaced with a humidity detection element,
It has been experimentally revealed that the relative humidity detected by the humidity detection element and the drying rate of the material to be dried 9 change over time as shown in FIG. 4.

As shown in FIG. 4, in the final stage of drying, the relative humidity changes rapidly after point D1. Relative humidity D1 at two points
Since the time dt1 required from D2 to D2 is the same as the relationship between temperature and drying rate, the delay time (t
By setting 3), a good dry finish can be obtained.

It has been experimentally revealed that if the dryness level detection means is replaced with something that detects the resistance value of clothing (for example, an electrode), the resistance value and drying rate change over time as shown in Figure 6. There is.

Note that the element (electrode) 20 for detecting the resistance value of clothing may be provided at a position facing the inner surface of the rotating drum 7 and making good contact with the clothing, as shown in FIG.

The resistance value of the clothing changes rapidly in the final stage of drying, as seen from point D2 onward in FIG. Resistance value R1 at two points
Since the time Δt2 required from to R2 is the same as the relationship between the temperature and the drying rate, a good dry finish can be obtained by setting the delay time t4 according to this 1jt2.

According to the above embodiment, the user does not need to determine the drying time based on the type and amount of clothing, power supply voltage fluctuation, ambient temperature fluctuation, heater capacity, etc., and it is possible to automatically obtain a good dry finish. .

Effects of the Invention The present invention detects the dryness level at two points using a dryness level detection means that detects the dryness level, sets a delay time according to the required time, and controls the drying operation. A dry finish can be obtained. In other words, it eliminates the troublesome and error-prone operation of setting the drying time by the user, and prevents resetting the drying time in the case of under-drying and unnecessary use of energy in the case of over-drying. Therefore, it is possible to provide an excellent control device for a dryer that can always obtain a good dry finish reverse condition.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a control configuration of a dryer in an embodiment of the present invention, FIG. 2 is a diagram showing its specific configuration,
Figure 3 shows the temporal changes in the exhaust temperature and the drying rate of the items to be dried, Figure 4 shows the temporal changes in the relative humidity of the exhaust air and the drying rate of the items to be dried, and Figure 5 shows the changes in the drying rate of the clothes. It is a figure which shows the time change of a resistance value and the drying rate of a to-be-dried material. DESCRIPTION OF SYMBOLS 1... Dryness level detection means, 2... Dryness level discrimination means, 3... Memory means, 4... Control means, 5... Heater drive means, 6... ...Motor drive means, end...Rotating drum, 10...
Motor, 16... Heater, 19... Microcomputer. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure ε1) Figure 2 ρ Figure 3 1 hour Question 4 Figure 1 hour Question 5 Figure 1 hour

Claims (1)

[Claims] A dryer control device that detects dryness levels at two points using dryness level detection means that detects dryness levels, and sets a delay time corresponding to the required time.