JPS59197298A - 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 suitable 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 has to judge and determine the set time depending on the type and amount of clothing.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned problems of the conventional art.The present invention is aimed at solving the above-mentioned conventional problems.
The relative humidity inside the drum, the relative humidity exhausted from the drum, the electrical resistance of the clothes, etc. change over time, and these changes are closely related to the dryness level of the clothes. It is an object of the present invention to provide a control device for a dryer that detects the point at which the ratio of drying temperature suddenly changes from the previous point and obtains a desirable drying finish state based on the detected point.

Structure of the Invention The present invention includes a dryness level detection means for detecting the dryness level of clothing, detects an inflection point of the dryness level based on the information, and detects a change in the dryness level based on the inflection point of the dryness level. The device is equipped with a drying level change detecting means for setting the drying period, and automatically maintains a good drying condition by controlling the operating time according to the change in the drying level after the inflection point of the drying level. It is something that can be obtained.

DESCRIPTION OF EMBODIMENTS The present invention will be described in detail below. FIG. 1 is a process diagram showing the construction of an embodiment, in which numeral 1 indicates a dryness level detection means for detecting the dryness level of clothing.

Reference numeral 2 denotes dryness level determining means, which is similar to the dryness level detecting means 1.
and the output of the storage means 3 are input. In addition, the storage means 3 stores data regarding the drying level, data regarding changes thereof, and data on driving the heater and motor for a predetermined period of time in response to changes in the drying level.

The outputs of the dryness level determining means 2 and the storage section 3 are both input to the control means 4. The M control means 4 controls the heater drive means 6 to control power supply to the heater. It controls the motor drive means 6 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 the drying level is at an inflection point. Accordingly, the configuration is such that power is supplied to the heater and motor 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.

Reference numeral 1o denotes a motor provided at the lower part of the outer box 1, which rotates the rotary drum 7 via a belt 11 and also rotates a fan 13 in 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 the drum, which is arranged on the front surface of the rotating drum 7 and fixed to the outer box 8, is used for generating hot air inside the Ij plate 15. It is hot weathered by the heater 16 of
The air is supplied into the rotating drum 7 through the vent portion 15a of the drum front plate 16. The hot air that has removed moisture from the dried material 9 inside the rotating drum is then released through the filter cover 17, the filter 18, the vent section 7a provided on the rotating drum 7, and the vent section 12a of the fan case 12. It is discharged outside the box 8. In this manner, the material to be dried 9 in the rotating drum 7 is dried with hot air.

Reference numeral 1a denotes a thermistor having a negative resistance-temperature characteristic, which is a temperature detection element, and is installed, for example, in the exhaust passage of the fan case 12 so as to detect the temperature of the hot air discharged from the rotating drum 7, that is, the exhaust temperature. There is.

Reference numeral 19 denotes a microcomputer, which determines the temperature based on a built-in program and generates signals for driving the heater 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, the heater, a driving means 5. Output section 19C2 that outputs a control signal to the motor and sounding means 6; the storage section 19a; input section 19;
b, and an arithmetic control section 19d that controls the output section 19c and performs data comparison operations.

By the way, when the object 9 to be dried inside the rotating drum is dried by hot air drying as described above, the exhaust temperature detected by the thermistor 10 and the drying rate of the object 9 to be dried change over time as shown in FIG. It has been experimentally shown that this will be the case. In FIG. 3, period m1 is a preheating period required for the temperature of damp clothes and the inside of the machine to rise, and although the temperature rises rapidly, it is a period that hardly contributes to drying the clothes. Period B is a constant rate drying period in which the moisture contained in the clothing begins to evaporate steadily, and is a period in which the temperature is approximately constant but the drying of the clothing progresses rapidly. Period C is the final stage of drying, and the moisture content in the clothes has decreased, so the temperature begins to rise and the drying of the clothes progresses slowly.
The change in temperature at this time will be smaller as the amount of clothing increases, the thicker the type of clothing, the smaller the change will be, and the lower the ambient water temperature, the smaller the change will be. Furthermore, it has been experimentally revealed that the smaller the heater capacity, the smaller the change.

Furthermore, the smaller the change in temperature (ΔT/Δt), the longer the time (t2) required to completely dry the clothes (2 points) after the temperature inflection point (point D), that is, the time to change the drying rate from X to Z. (t2) becomes longer.

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. The smaller the change in relative humidity (JH/Jt) at this time, the longer the time required for the clothes to dry completely (the time the drying rate goes from Xl to 21). The type and amount of clothing, fluctuations in ambient temperature, fluctuations in power supply voltage, and size of heater capacity are the same as the relationship between temperature and drying rate.

It has been experimentally shown that when the dryness level detection means is replaced with something that detects the resistance value of clothing (for example, an electrode), the temporal changes in resistance value and drying rate become as shown in Figure 5. .

The element (electrode) 20 that detects the resistance value of clothing is
In the case shown in FIG. 2, it is preferable to face the inner surface of the rotating drum 7 and to provide good contact with clothing.

The resistance value of the clothing changes rapidly in the final stage of drying, as seen from point 02 onwards in FIG. The change in resistance value at this time (lR/Δt2) is /''・The time required for the clothes to completely dry (the time the drying rate changes from X2 to 22)
becomes longer. Please note that the type and amount of clothing, ambient temperature fluctuations,
Regarding the power supply voltage fluctuation and the size of the heater capacity, the relationship between the temperature and the drying rate is as described above.

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, amount of heater waste, etc., and can automatically obtain a good dry finish state. I can do it.

Effects of the Invention The present invention detects an inflection point of the dryness level using a dryness level detection means that detects the dryness level, sets a period for detecting a change in the dryness level based on the inflection point of the dryness level, and uses the information to determine the dryness level. Since the operation is controlled, a good 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. It is possible to provide an excellent dryer control device that can always obtain a good dry finish state.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the 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... Storage means, 4... Control means, 6... Heater drive means, 6... ...Motor driving means, 7...Rotating tram, 10...Motor, 16...Heater, 19...Microcomputer. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure δ Figure 3 One hour Figure 4 Temporary viewing

Claims (1)

[Claims] A control device for a dryer that detects an inflection point of the dryness level using a dryness level detection means that detects the dryness level, and sets a period for detecting a change in the dryness level based on the inflection point of the dryness level.