JPS59222197A - 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 The present invention relates to a clothes dryer that automatically stops operating when finished drying reaches a certain level.

Conventionally, there has been a clothes dryer shown in Japanese Patent Application Laid-open No. 53-2757 as shown in FIG. In the figure, 1 is an outer box of the clothes dryer, 2 is a drum rotatably supported by the outer box, and is driven by a motor 4 via a bell 31Fc.

5 is a filter installed in the exhaust port 2a provided at the center of the rear of the drum 2; 6 is a heater; the air flowing in from the intake lower provided on the back plate of the outer box 1 is heated by the heater 6, and the inside of the drum 2 is heated. It flows in as wind. Reference numeral 8 denotes an exhaust air passage provided behind the drum 2, in which a fan 9 is disposed, and this fan 9 is rotationally driven by the motor 4 via a belt 10. The exhaust air passage 8 communicates with the exhaust port 5a of the drum 2 and guides the air after heat exchange with the clothing to the outside through the exhaust port 11. The intake air dust detector is located near the intake lower 0 above, and consists of a temperature sensing element such as a thermistor.
The entire temperature of the air flowing into the outer box 1 from the intake lower is detected.

Reference numeral 13 denotes an exhaust temperature detector disposed within the exhaust air passage 8, which is comprised of a temperature sensing element such as a thermistor, and detects the temperature of the air passing through the exhaust air passage 8. 14 is a door for putting in and taking out clothes.

FIG. 2 is a block diagram of the control device for the clothes dryer shown in FIG. 1, where the same reference numerals as in FIG. 1 indicate the same parts. Reference numeral 15 denotes a temperature difference detection unit which receives temperature signals from the intake air temperature detector 12 and the exhaust temperature detector 13 and detects the temperature difference between the two. Reference numeral 16 denotes a comparison section that compares the output of the temperature difference detection section 15 with a preset temperature set to a predetermined value, and the motor 4 and heater 6 are connected to the output end of this comparison section.

Next, the operation will be explained with reference to the characteristic diagram of intake air temperature and exhaust air temperature with respect to drying time shown in FIG. Initially, the hot air supplied from the heater 6 is used to heat the clothes and the moisture absorbed by them, and then the clothes dry over time, but the heat is consumed as latent heat. The exhaust gas temperature hardly changes. Eventually, when the degree of dryness approaches 100%, heat is again consumed as a thermosensor, so the exhaust gas temperature rises rapidly. Therefore, the approximate dryness of clothing is indirectly detected from the difference between the exhaust air temperature and the intake air temperature.

When the comparator 16 detects that the temperature difference of the absorption air, which is the output of the temperature difference detector 15, has reached the set temperature, the comparator 16 stops the power supply to the motor 4 and the heater 6, and stops the operation of the clothes dryer.

However, it has been found that the exhaust temperature at the end of drying varies depending on the amount of clothes in the drum 2, which is the removed and dried material. If we take the point that all clothes are at the same degree of dryness as the standard, the larger the amount, the higher the exhaust temperature will be. Therefore, in conventional clothes dryers, the difference in intake and exhaust temperatures at which they stop operating is constant, so if the amount of clothes is too small, it will overdry and consume power unnecessarily; However, there was a drawback that the operation was stopped due to insufficient drying.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and is equipped with two temperature detectors with different detection response speeds in the exhaust air path, and uses this temperature detector to determine the dryness of clothes. The overall purpose is to provide a complete clothes dryer that automatically stops the operation of the dryer by detecting the same.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 is a cross-sectional view of the clothes drying method of the present invention, with reference numerals 1 to 1.
1 and 14 are the same as the conventional ones, so their explanation will be omitted. 20 is a first exhaust gas temperature detector which is arranged in the exhaust air passage 8 and has a relatively fast detection response; 21 is arranged in the exhaust air passage 8 near this detector 20 and has a detection response sound which is slower than this; This is the second exhaust gas temperature detector.

FIG. 5 is a block diagram of the control device for the clothes dryer shown in FIG.
21 is a temperature difference detector that receives all the temperature inputs from No. 1 and detects the temperature difference between the two, and 23 is the first exhaust temperature detector 2.
0 and set temperature tI″f: the first comparator inputs and fully compares both, and 24 inputs the temperature difference and set temperature jzk, which are output signals from the temperature difference detector 22, and compares both. 25f'i A timer that measures a predetermined time from the start of drying.
6 is connected. This output switch 26 inputs the outputs of the first and second comparators 23 and 24 and switches these signals. Note that the motor 4 and heater 6 are connected to the output end of the output switch 26.

Next, the entire operation will be explained with reference to the characteristic diagram shown in FIG. 6th
The figure shows the detected temperature characteristics of the first and second exhaust temperature detectors 20 and 21, which correspond to the exhaust temperature with respect to the drying time.The characteristic shown at A in the figure is the first exhaust temperature when there is a small amount of clothing. Detection temperature of the detector, characteristic A shown by the broken line! is the temperature detected by the second exhaust gas temperature detector 21 at that time. In addition, there is a small amount of damage to the clothes.

is about 1/1o of the rated load of the clothes dryer.

Further, the characteristic shown in B is the temperature detected by the first exhaust temperature detector 20 when the amount of clothing is about 1/2 of the rated load, that is, a medium load, B! is the temperature detected by the second exhaust gas temperature detector 21, and similarly, C, C2 indicate the respective detected temperatures at the rated load state. A line connecting the temperatures detected by the first exhaust gas temperature detector 20 for each characteristic indicates the exhaust temperature during finishing drying. 6th
As can be seen from the figure, the characteristics that indicate the dryness of the finish are that an inflection point P appears near a small load, and at a load amount that reaches finish dryness in a shorter time than the inflection point P, the exhaust air during finish drying. The temperature decreases in inverse proportion to the amount of load. Furthermore, if it takes longer than point P, the exhaust temperature during finishing drying increases in proportion to the load amount.

The temperature difference between the detected temperatures of the first and second exhaust temperature detectors 20.21 (hereinafter referred to as temperature difference Δt) is detected at the beginning of drying and at the end of drying, when the exhaust temperature changes rapidly. This is the second exhaust temperature detector 21 which has a slow detection response to changes in exhaust temperature.
This is because it cannot follow the temperature change. After that, when there is no change in exhaust temperature, the first and second exhaust temperature detectors 20
．． The detection outputs of 21 match and the temperature difference becomes Δt tsQ//. When the drying progresses to 1- and approaches the final drying, the exhaust temperature rises again and a temperature difference /'t occurs. This upper row-
The rate of change in exhaust gas temperature becomes steeper as the amount of clothing decreases.

The detected temperature signal of the first exhaust gas temperature detector 20 is input to the first comparator 23 . This comparator compares the temperature with a preset temperature t1. This set temperature t is set to the bleed air temperature when a small amount of load is applied. When the temperature detected by the first exhaust gas temperature detector 20 is reached, the comparator 23 outputs a signal from its output terminal.
Higb" signal is sent to the output switch 26. At the same time, the detection signals from the first and second exhaust temperature detectors 20 and 21 are input to the temperature difference detector 22, which detects the difference between the two, i.e. Generates t'l to temperature difference.Temperature difference △t
is input to the second comparator 24 and compared with the set temperature t2.

On the other hand, when the load is kV for a longer drying time than the inflection point P, the exhaust temperature during final drying increases as the amount of clothing increases. From this, the first and second exhaust temperature detectors 20.2
If a response time constant of 1 is appropriately selected, the degree of dryness of clothing can be indirectly detected by the temperature difference t. In the final drying process, the temperature difference t is constant for each load.

This temperature difference is preset as a value of the set temperature △t,
It is input to the second comparator 24. When the temperature difference t becomes the set temperature difference Δt, the comparator 24 sends an XHigh" signal to the output switch 26 from its output terminal.

The timer time 'r of the timer 25 is set to a time near the inflection point P of the characteristic indicating the finished dryness. This time T is 20
It is around 1 minute. The output signal of the timer 25 is sent to the output switch 26.
This switching device sends the output signals to all morphs 4 and the heater 6 of the first comparator 23 during the time T measured by the timer 25 from the start of drying, and after that time, the switching device sends the output signals to all the morphs 4 and the heater 6 from the start of drying. 24 is transmitted to the motor 4 and heater 6.

Then, the motor 4 and heater 6 are set to 'Hi' from the output switch 26.
g) When the signal 1 is input, the power supply will be stopped [2] The operation of the clothes dryer will be terminated.

In the description of this invention, we have described an exhaust-type clothes dryer that exhausts all of the air that dried clothes inside the drum to the outside. In the case of a circulation type clothes dryer having a circulating air passage for blowing air into the clothes dryer, the same operation as described above can be performed by detecting the temperature inside the circulation air passage. After detecting finished drying, the dryer may be completely stopped, or the dryer may be operated with cold air or a buzzer may be used to alert the dryer.

As described above, according to the present invention, a timer is provided to measure a predetermined period of time from the start of drying of clothes, and when the load is small such as finishing drying while the timer is operating, when the exhaust temperature reaches a predetermined level, drying is performed. The operation of the machine is terminated 12, and after a predetermined period of time, the operation is terminated based on the difference in temperature detected by two temperature detectors with different detection response speeds.
It is possible to perform drying with a constant finish regardless of the amount of clothes, from a small load of clothes to a rated load.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional clothes dryer, Fig. 2 is a block diagram of the control device shown in Fig. 1, Fig. 3 is a characteristic diagram of intake air and exhaust temperature with respect to drying time, and Fig. 4 [7+ is according to this invention]. FIG. 5 is a sectional view of the clothes dryer, FIG. 5 is a block diagram of the control device shown in FIG. 4, and FIG. 6 is a characteristic diagram of exhaust temperature versus drying time. 1... Outer box, 2... Drum, 4... Motor, 6...
... Heater, 8... Exhaust air path, 20... First exhaust temperature detector, 21... Second exhaust temperature detector, 22.
...Temperature difference detector, 23...First comparator, 24...
- Second comparator, 25... timer. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Agent Masuo Oiwa Figure 1 Figure 2 Figure 3 Yabu J'lz Time Figure 4

Claims (1)

[Scope of Claims] 1) A drum rotatably supported within an outer box, a heated air supply means for supplying heated air into the drum, a driving means for rotating the drum, and air discharged from the drum. What is claimed is: 1. A clothes dryer equipped with two temperature detectors having different detection response speeds for detecting the temperature of the clothes dryer, characterized in that the clothes dryer is equipped with a timer that measures a predetermined time from the start of drying. 2) The time measured by the timer is such that the operation of the clothes dryer is stopped when either one of the two temperature detectors reaches a preset temperature.
Clothes dryer as described in section. 3) After the time measured by the timer, the operation of the clothes dryer is stopped when the detected temperatures of the two temperature detectors reach a predetermined relationship. Clothes dryer as described.