JPH03140198A - Clothing dryer - Google Patents

Abstract

PURPOSE:To accurately judge prescribed time required for residual drying by performing an air blasting operation for the prescribed time without performing a heating operation immediately when a drying operation is started. CONSTITUTION:A prescribed time counting part 10 supplies an output signal to a control means 8 after the lapse of the prescribed time after starting the drying operation. A discharge temperature comparison part 11 compares and judges whether or not a discharge temperature when starting the drying operation exceeds a prescribed value by receiving the output signal of a discharge temperature detecting part 1, and supplies the output signal to the control means 8. The rotary driving of a drum 2 and an air blasting fan 4 are started to start the drying operation, however, at this time, only the air blasting operation is performed, and no heat source 3 is energized. Air blasting time in the case of starting the drying operation is set at around four minutes, and after that, the drying operation by hot blasting is performed by operating a heat driving means 6. After the heat source 3 is energized and the drying operation is started, the change ratio of the discharge temperature for drying time differs based on the volume of clothing or a dehydration ratio at the start of the drying operation, however, it is possible to comparatively accurately predict drying operation time.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to clothes dryers used in general households, etc.
In particular, it relates to its control means.

2. Description of the Related Art Conventionally, this type of drying machine for drying clothes has been manufactured, for example, by
The configuration was as shown in the 1990 publication. The mechanism will be explained with reference to the block diagram in FIG. 3 and the structural diagram of the dryer in FIG. 4. In Fig. 4, 1 is a discharge temperature detection unit that measures the discharge temperature, 2 is a drum that stores clothes, 3 is a heat source for turning intake air into hot air, and 4 is a blower fan that produces intake air. .

On the other hand, in FIG. 3, 5 is a prediction unit that detects the change in the discharge temperature detection unit 1 during drying operation and detects the time required for remaining drying, and the heat source 3 is activated according to the output signal. A control means 8 is provided to control the heating drive means 6 to drive and the blower means 7 to drive the blower fan 4 .

When the drying operation is started, the exhaust temperature rises over time as shown in Figure 5, but the rate of increase in the T1 section varies depending on the type of clothing, as shown in sections a to C. From this, it was possible to predict the time T2 to T4 required for drying each remaining portion.

Problems to be Solved by the Invention In such a conventional configuration, the remaining drying time is predicted based on the change in exhaust temperature at the beginning of the drying operation. If you turn on the power again and restart drying operation before the drum has cooled down, the temperature inside the drum will be high from the beginning of operation, for example, the exhaust temperature change curve as shown in pattern a in Figure 2. Therefore, since the regular temperature characteristics as shown in FIG. 5 are not drawn, there is a high possibility that an error will occur in determining the remaining drying time. Furthermore, if the dryer is placed in a place exposed to direct sunlight during the summer, the temperature inside the drum will rise, and there is also a high possibility that the remaining drying time will be incorrectly determined.

The present invention solves this problem by providing a clothes dryer that can accurately determine the time required for remaining drying, regardless of the situation or situation before the start of drying operation. The purpose is to provide

Means for Solving the Problem In order to solve this problem, the present invention is configured such that when the drying operation is started, the air blowing operation is performed for a predetermined period of time without heating immediately, and as a second means. , the above-mentioned blowing operation is provided for a predetermined period of time only when the discharge temperature at the start of the drying operation is equal to or higher than a predetermined value.

Function: With this configuration, the temperature inside the drum at the beginning of the drying operation is maintained at a constant level similar to the outside temperature, making it possible to normally detect the remaining predetermined time in any case. becomes. Additionally, the exhaust temperature at the beginning of the drying operation determines the previous usage conditions and conditions such as direct sunlight applied to the dryer, so that the blower operation can be set only when necessary. As a result, the remaining drying time can be accurately detected regardless of the state before the start of the drying operation.

Example Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a schematic diagram of a clothes dryer according to an embodiment of the present invention. In FIG. 1, 10 is a predetermined time measuring section which provides an output signal to the control means 8 when a predetermined time has elapsed from the start of the drying operation. Reference numeral 11 denotes a discharge temperature comparing means, which receives an output signal from the discharge temperature detection section 1, compares and determines whether the discharge temperature at the start of the drying operation is equal to or higher than a predetermined value, and provides an output signal to the control means 8. Note that the discharge temperature detection section 1, the remaining required time 1m prediction section 5, the heating driving means 6, and the blowing means 7 have the same functions as the conventional one shown in FIG.

In the above configuration, in order to start the drying operation, the fourth
The rotation of the drum 2 and the blower fan 4 shown in the figure is started, but at this time, the heat source 3 is not energized except for the blower operation. Therefore, as shown in Figure 2, the discharge temperature becomes stable over time as in section T2, regardless of the state before the start of the drying operation. , if the temperature inside the drum 2 has risen due to strong direct sunlight,
As shown in the pattern, the discharge temperature approaches the pattern b in other cases due to the feeding operation as time passes, and the time T1 until the pattern a approaches the pattern b is the Although it depends on the amount and the temperature inside the drum 2 at the start of the drying operation, it has been experimentally found that the degree of decentralization is about 1 to 3. Therefore, the air blowing operation time at the start of the drying operation is set to about 4 minutes, and then the heating drive means 6 is operated to perform the drying operation using hot air.

After energizing the heat source 3 and starting the drying operation, as shown in the conventional example, the drying time is adjusted depending on the amount of clothes and the dehydration rate at the start of the drying operation, as shown in the temperature curve in Figure 5. Although the rate of change in exhaust gas temperature varies from a to C, the approximate remaining time for the subsequent drying operation is T2 to C.
It can be predicted as T4.

However, by performing air blowing operation for a predetermined time at the start of drying operation in this way, it is possible to accurately detect the remaining operating time, but in the case of pattern b in Figure 2, only the air blowing operation time is detected. This will extend the overall driving time.

Therefore, as a second measure, if the exhaust gas temperature at the start of operation is not particularly high, or if the exhaust temperature immediately after the start of operation has not decreased over the elapsed time, start the ventilation operation at that point. It is determined that there is no problem in detecting the remaining time even if there is no drying time, and a drying operation using heat development is carried out immediately.

Effects of the Invention As described above, according to the present invention, it is possible to relatively accurately predict the remaining drying operation time regardless of the operating condition or operating environment of the dryer at the time of starting the drying operation, and By detecting the discharge temperature at the start of the drying operation, it is also possible to detect the remaining drying operation time without performing the blowing operation if it is not necessary.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a clothes dryer according to an embodiment of the present invention.
Figure 2 is a characteristic diagram of the exhaust temperature at the start of operation of the clothes dryer, Figure 3 is a block diagram of a conventional clothes dryer, Figure 4 is a structural diagram of the clothes dryer, and Figure 5 is the amount of clothes. FIG. 3 is a characteristic diagram showing the relationship between drying time and discharge temperature according to FIG. DESCRIPTION OF SYMBOLS 1... Discharge temperature detection unit, 3... Heat source, 4... Ventilation fan, 5... Remaining time prediction unit, 6... Heating drive means, 7... Visceral delivery means, 8 ...control means, 10
. . . Predetermined time measuring section, 11 . . . Discharge temperature comparison means.

Claims (1)

[Scope of Claims] 1. A heating drive means for heating intake air, and an air blower for sucking air into a drying chamber, removing moisture from the drying chamber by the air heated by the heating drive means, and discharging the hot air from the drying chamber. and the heating driving means is stopped for a predetermined time at the beginning of the drying operation, and the remaining time required for the drying operation is predicted based on the degree of rise in the discharge temperature at the time when the heating driving means is started. Clothes dryer equipped with control means for controlling. 2. The control means controls the heating drive means to stop for a predetermined period of time before estimating the remaining time only when the discharge temperature at the start of operation is equal to or higher than a predetermined temperature. clothes dryer.