JPH05161794A - Clothes drying machine - Google Patents

Abstract

PURPOSE:To automatically stop the operation in the optimum operation period in response to the volume of the clothes to be dried in a clothes drying machine automatically stopping the operation in response to the dried state. CONSTITUTION:The first temperature sensor 12 is arranged below a hot-air blowout port guiding the hot air into a rotary drum from a heater 7, and the second temperature sensor 13 is arranged above it. The temperature difference between the first and second temperature sensors 12, 13 detected by a temperature detecting means is detected by a temperature difference detecting means 17. The temperature difference detected by the temperature difference detecting means 17 is compared with the preset value by a comparing means 18, the operation period is set by a calculating means 19 based on the information obtained by the comparing means 18, and the heater 7 and a motor 2 are controlled based on the operation period set by the calculating means 19. The calculating means 19 sets the operation period long when the temperature difference detected by the temperature difference detecting means 17 is small, and the operation is automatically stopped in the optimum operation period in response to the volume of the closes to be dried.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary drum type clothes dryer which automatically stops its operation depending on the dry state of clothes.

[0002]

2. Description of the Related Art Heretofore, a clothes dryer of this type has been generally shown in FIGS. Hereinafter, description will be given based on the drawings.

As shown in the figure, a motor 2 serving as a drive source is provided above the dryer main body 1, and a fan 3 provided on the back side of the motor 2 and the dryer main body 1 and the fan 3 are provided.
Belts 5 and 6 are respectively stretched between the belt 3 and the rotary drum 4 provided in front of the fan 3, and the fan 3 and the rotary drum 4 are rotated by driving the motor 2. Further, a heater 7 having a positive temperature characteristic serving as a heat source is arranged on the front side of the dryer main body 1, and hot air heated through the heater 7 by the rotation of the fan 3 is rotated through a hot air outlet 8 to a rotary drum. Four
The article to be dried (clothes) that has been introduced into the inside and stored in the rotary drum 4 is heated and dried. Arrow A indicates the flow of wind. The hot air outlet 8 is viewed from the front as shown in FIG.
It is located below the center of rotation of the rotary drum 4 and is arranged on the front side in the direction of rotation of the rotary drum 4 (arrow B). This is because the hot air coming out of the hot air outlet 8 is the rotating drum 4.
This is for efficiently hitting the material to be dried which is rotationally stirred. Further, the electrode 9 is used for the rotating drum 4 during operation.
It is designed to come into contact with the material to be dried inside. As shown in FIG. 8, the electrode 9 is composed of two conductive members 10 and an insulating member 11, and by detecting the resistance value r between the conductive members 10, the dry state of the material to be dried can be detected. There is.

The operation of the above structure will be described. From time t2 when the resistance value r between the conductive members 10 becomes larger than the set value a continuously for a predetermined time T1 as shown in FIG.
The operation is terminated at time t4 when the constant delay time T3 has elapsed. The delay time T3 is set because the drying is insufficient at the time t2.

[0005]

In such a conventional clothes dryer, since the delay time T3 is constant regardless of the capacity of the material to be dried, the drying is insufficient due to the size of the material to be dried. However, there is a problem that it may be overdried.

The present invention is intended to solve the above problems, and an object thereof is to automatically stop the operation in an optimum operation time according to the capacity of the material to be dried.

[0007]

In order to achieve the above object, the present invention provides a heater having a positive temperature characteristic as a heat source, a motor as a driving source, a rotary drum for rotating and stirring an object to be dried, A first temperature sensor disposed below the hot air outlet for introducing hot air from the heat source into the rotary drum; a second temperature sensor disposed above the hot air outlet; And temperature detecting means for detecting the temperature from the second temperature sensor, temperature difference detecting means for detecting the temperature difference between the first and second temperature sensors detected by the temperature detecting means, and the temperature difference detecting means. Comparing means for comparing the temperature difference detected by the comparator with a set value, calculating means for setting an operating time based on the information obtained by the comparing means, and the heater based on the operating time set by the calculating means. and And control means for controlling the serial motor, said calculation means, when the temperature difference detected by the temperature difference detecting means is smaller are the SUMMARY that it has to set a longer operation time.

[0008]

According to the present invention, by the above-mentioned means for solving the problem, the temperature difference between the two temperature sensors arranged at the hot air outlet is calculated to automatically operate in the optimum operating time according to the capacity of the material to be dried. Can be stopped.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
Will be described with reference to. The same components as those of the above-mentioned conventional example are designated by the same reference numerals and the description thereof will be omitted.

As shown in the figure, the first temperature sensor 12
Is disposed below the hot air outlet 8 and detects the temperature of the hot air coming out from the lower portion. The second temperature sensor 13 is arranged above the hot air outlet 8 and detects the temperature of the hot air coming out of the upper portion. Further, the electrode 9 is adapted to come into contact with the material to be dried in the rotary drum 4 during operation. The resistance detecting means 14 detects the resistance value R between the two conductive members 10 of the electrode 9, and the temperature detecting means 15 detects the temperatures Ts1 and Ts2 from the two temperature sensors 12 and 13. Microcomputer 16
Is a temperature difference detecting means 1 for detecting a temperature difference Td between the two temperature sensors 12, 13 detected by the temperature detecting means 15.
7, a comparing means 18 for comparing the temperature difference detected by the temperature difference detecting means 17 with a set value, and a calculating means 19 for setting an operating time based on the information obtained by the comparing means 18. The control means 20 is the microcomputer 1
The operation of the heater 7 and the motor 2 is controlled according to the control signal output from the motor 6.

The operation in the above structure will be described with reference to FIGS. 4 and 5. Time t6 when the resistance value R between the two conductive members 10 of the electrode 9 becomes continuously larger than the set value b for a predetermined time T5. Thus, the operation ends at time t8 when the delay time T7 has elapsed. The delay time T7 is determined by the temperature difference Td between the two temperature sensors 12 and 13. The delay time T7 is set to be long when the temperature difference Td is small. On the contrary, when the temperature difference Td is large, the delay time T7 is set to be short. The delay time T7 is set because the drying is insufficient at the time t6, and the time (T7) until an appropriate dry condition is determined by the capacity of the material to be dried. That is, when the capacity of the material to be dried is large, it is necessary to lengthen the delay time T7. Here, when the volume of the material to be dried is large, the temperature difference T
d becomes small. This is because the heater 7 has a positive temperature characteristic, and the temperature of hot air becomes high when the amount of air passing therethrough is small. When the volume of the material to be dried is large, the hot air outlet 8 is entirely closed by the material to be dried, and the temperature Ts1 of the first temperature sensor 12 arranged below the hot air outlet 8 is arranged above the hot air outlet 8. Also, the temperature Ts2 of the second temperature sensor 13 is increased and the temperature difference Td is decreased. On the contrary, when the capacity of the material to be dried is small, the delay time T7 may be short. If the volume of the material to be dried is small, the hot air outlet 8
It is easy to block only the lower part of the and the upper part is difficult to block. That is, the temperature Ts1 of the first temperature sensor 12 arranged below the hot air outlet 8 is high, but the temperature Ts2 of the second temperature sensor 13 arranged above is lower than the temperature Ts1. Therefore, the temperature difference Td becomes large. As described above, the delay time T7 is set by utilizing the fact that the temperature difference Td changes depending on the size of the material to be dried, and the operation is automatically stopped at the optimum operating time according to the capacity of the material to be dried. Can be made.

[0012]

As is apparent from the above embodiments, according to the present invention, a heater having a positive temperature characteristic as a heat source,
A motor serving as a drive source, a rotary drum for rotating and stirring the material to be dried, a first temperature sensor arranged below a hot air outlet for introducing hot air from the heat source into the rotary drum, and the hot air blowing A second temperature sensor arranged above the outlet, a temperature detecting means for detecting the temperature from the first and second temperature sensors, and a first and second temperature detected by the temperature detecting means. Temperature difference detecting means for detecting the temperature difference of the sensor, comparing means for comparing the temperature difference detected by the temperature difference detecting means with a set value, and operating time is set based on the information obtained by the comparing means. The calculation means includes control means for controlling the heater and the motor based on the operating time set by the calculation means, and the calculation means has a small temperature difference detected by the temperature difference detection means. Huang it is so arranged that setting a longer operation time can be realized an excellent clothes dryer can be stopped automatically operated in the optimum operating time in accordance with the capacity of the material to be dried.

[Brief description of drawings]

FIG. 1 is a block diagram of a clothes dryer according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of the clothes dryer.

FIG. 3 is a front view of the clothes dryer.

FIG. 4 is a diagram showing a change with time of a detected resistance value of an electrode of the clothes dryer.

FIG. 5 is a view showing a time change of temperature of the first and second temperature sensors of the clothes dryer.

FIG. 6 is a vertical sectional view of a conventional clothes dryer.

FIG. 7 is a front view of the clothes dryer.

FIG. 8 is an enlarged perspective view of an electrode of the clothes dryer.

FIG. 9 is a diagram showing a change with time of a detection resistance value of an electrode of the clothes dryer.

[Explanation of symbols]

 2 motor 4 rotating drum 7 heater 8 hot air outlet 12 first temperature sensor 13 second temperature sensor 15 temperature detecting means 17 temperature difference detecting means 18 comparing means 19 computing means 20 control means

Claims (1)

[Claims] 1. A heater having a positive temperature characteristic as a heat source, a motor as a drive source, a rotary drum for rotating and stirring an object to be dried, and a hot air outlet for introducing hot air from the heat source into the rotary drum. A first temperature sensor disposed at a lower portion of the hot air outlet, a second temperature sensor disposed at an upper portion of the hot air outlet, and temperature detection means for detecting temperatures from the first and second temperature sensors. A temperature difference detecting means for detecting a temperature difference between the first and second temperature sensors detected by the temperature detecting means, and a comparing means for comparing the temperature difference detected by the temperature difference detecting means with a set value. Comprising: calculating means for setting an operating time based on the information obtained by the comparing means; and controlling means for controlling the heater and the motor based on the operating time set by the calculating means, the calculating means Is a clothes dryer in which the operating time is set to be long when the temperature difference detected by the temperature difference detecting means is small.