JPH0350560B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a dryer for drying clothes used in general households.

Conventional structure and its problems Traditionally, methods for detecting the completion of drying in clothes dryers include installing electrodes inside the drum to electrically detect the wetness of the clothes, and using a thermistor to measure the temperature difference between the intake and exhaust air. A method is used to detect this and control the electric circuit. However, the former electrode method has the disadvantage that it is necessary to provide an attachment part for the electrode inside the drum, resulting in a complicated structure and a complicated electric circuit. The latter method of detecting the temperature difference between intake and exhaust using a thermistor, etc.
Publication No. 30478, Japanese Patent Publication No. 55-133300, Japanese Patent Application Publication No. 1987-133300
Although it is described in Publication No. 56-57499, etc., it is activated when the intake and exhaust temperatures reach a certain set value, and it depends on the type of clothing (for example, slightly thick clothing, jeans, judo uniform, etc.). This was inconvenient because many of the products were insufficiently dried.

OBJECTS OF THE INVENTION An object of the present invention is to provide a dryer that can perform appropriate drying depending on the type of items to be dried (for example, regular clothes, slightly thick clothes, thick clothes).

Structure of the Invention The dryer of the present invention includes a box, a drum rotatably housed in the box and into which materials to be dried are charged.
an intake passage and an exhaust passage that guide air from the box body to the drum; a heater provided in the intake passage to heat the intake air; a temperature detection element provided in each of the intake passage and the exhaust passage; a signal generating means for generating a drying end signal when the detected temperature difference of the temperature sensing element reaches a predetermined set value; and an actuating section that operates to end the drying based on the signal generated by the means; The means is a bridge circuit incorporating each of the temperature detection elements and a variable resistor, and the set value of the detected temperature difference can be variably switched by the variable resistor.

Therefore, if the temperature difference between the suction and exhaust air is set in advance according to the type of material to be dried by changing the resistance value of the variable resistor built into the bridge circuit, the temperature difference between the suction and exhaust air can be adjusted to the set value. When the drying temperature is reached, the actuating part is activated, allowing proper drying without excess or deficiency.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 to 4. In Figures 1 to 3,
1 is a box of a clothes dryer, and 2 is a drum which is rotationally driven by a motor 3 via a belt 4 and a pulley 5. Reference numeral 6 denotes an exhaust fan which is driven by the motor 3 via a belt 7 and pulleys 8 and 9. Reference numeral 11 denotes a filter that captures dust scattered from the clothes in the drum 2. Reference numeral 12 denotes a door, which is opened and closed to throw clothes into the drum 2. A heater 13 heats the air sucked into the drum 2. Reference numerals 25 and 26 are an intake port and an exhaust port provided on the back surface of the box body 1, respectively.
is heated and sucked into the drum 2 through the intake port 28 of the drum 2. Further, the humid air inside the drum 2 is discharged to the outside of the drum 2 by the exhaust fan 6, and is further discharged to the outside from the exhaust port 26 of the box body 1 via the exhaust path 29.

Reference numeral 14 denotes an intake side temperature sensing element (thermistor) provided in the vicinity of the intake port 25 of the box body 1, and numeral 15 denotes an exhaust side temperature sensing element (thermistor) provided in the vicinity of the exhaust port 26 of the box body 1. 16 is a control panel, and as shown in FIG. 2, this panel is provided with a power switch 17 and push button switches 18, 19, 20 for setting the temperature difference between intake and exhaust.

In FIG. 3, 21 indicates a DC power supply, and 22
and 23 are the respective sensing elements 14 and 15, respectively.
They are also fixed resistors and variable resistors built into the bridge circuit. The variable resistor 23 has a resistance setting value that changes variably when any one of the push button switches 18, 19, and 20 is pressed. Also, 2
4 is an operating part, which finally includes a motor 3 and a heater 1.
3, and when the detected temperature difference between intake and exhaust reaches a set value, drying is terminated.

Next, the relationship between the drying time and the intake/exhaust temperature depending on the type of clothing and the amount put in will be explained. In other words, in a household electric clothes dryer with a power supply of 100 V, a heater of 1200 W, an exhaust air volume of 2 m ² /min, and a drying capacity of 2 kg (dry cloth), it is possible to dry ordinary cotton underwear, towels, and thick clothing (jeans, judo uniforms). The relationship between drying time (minutes) and suction/exhaust temperature (°C) for each input amount (g) was investigated. The results are shown in FIGS. 4 and 5, respectively. Figure 4 shows cotton underwear and towels, and Figure 5 shows cotton underwear and towels.
The figure shows test results for drying thick jeans and judo uniforms.

In general, clothes that are dried in dryers can be roughly divided into three types: cotton underwear, followed by children's clothes, pants, work clothes, and thick jeans. Therefore,
A detailed test of these three types revealed that the fourth
As shown in the figure, for cotton underwear, the amount of clothing input (A...
500g, B...1000g, C...2000g),
When the temperature difference (d) between intake and exhaust reaches 26℃, it becomes almost 100
It was found to be % dry. Furthermore, in the case of thick jeans, as shown in Figure 5, regardless of the amount of clothing input (D...500g, E...1000g),
When the temperature difference (d′) between intake and exhaust reaches 35℃, it becomes almost 100
It was found to be % dry.

Therefore, from this test result, it is clear that clothing, for example,
Determine the intake/exhaust temperature difference set value for three types of clothing: regular clothing, slightly thick clothing, and thick clothing (jeans) (for example, set the set value to approximately 26°C for regular clothing, approximately 30°C for slightly thick clothing, and In this case, the temperature will be approximately 35℃). This allows for a dry finish (nearly 100%) tailored to each garment. Furthermore, it has been found that this phenomenon takes almost the same value even if the outside air temperature changes (5 to 35°C) as long as the output (1200W) of the heater 13 does not change, so there is no need to correct for outside air temperature changes. do not have.

In other words, the operation is extremely simple and the second
Turn on the power switch 17 shown in the figure, and turn on the push button switches 18, 19, 2 according to the type of clothes to be dried (normal clothes, slightly thick clothes, thick clothes).
Just press either 0. As a result, the degree of drying can be set according to the type of clothes to be dried by changing the resistance value of the variable resistor 23 incorporated in the bridge circuit and variably changing the set value of the detected temperature difference between intake and exhaust. I do. Then, when the detected temperature difference between intake and exhaust reaches the set value, the drying is completed by the operating section 24.

In the above explanation, the test results for regular cotton clothing were explained, but since chemical fibers require less drying time, it is only necessary to press the push button switch 18 (...regular clothing).

Furthermore, a variable resistance switch can be used in place of the variable resistance 23 as means for variably switching the set value of the temperature difference between the intake and exhaust air.

Effects of the Invention According to this invention, the temperature difference between intake and exhaust air can be set in stages according to the type (drying ease) of items to be dried, such as clothes, by switching the variable resistor built into the bridge circuit. This has the advantage that the object to be dried can be properly dried, and the operation can be performed easily and reliably.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of one embodiment of this invention, Figure 2 is a front view of its control panel, Figure 3 is a circuit diagram of the bridge circuit, and Figure 4 is for drying ordinary cotton clothing (underwear, towels). FIG. 5 is a graph showing the relationship between time and intake/exhaust temperature. FIG. 5 is a graph showing the relationship between drying time and intake/exhaust temperature for thick clothing (jeans, judo uniform). DESCRIPTION OF SYMBOLS 1... Box body, 2... Drum, 3... Motor, 27... Intake path, 29... Exhaust path, 14, 15... Temperature detection element, 23... Variable resistance, 24... Operating part.

Claims (1)

[Scope of Claims] 1. A box, a drum that is rotatably housed in the box and into which materials to be dried are introduced, an intake passage and an exhaust passage that guide air from the box to the drum, and an air intake passage within the intake passage. a heater installed in the heater to heat the intake air;
Temperature sensing elements provided in the intake passage and the exhaust passage, a signal generating means for generating a drying end signal when the detected temperature difference of each temperature sensing element reaches a predetermined set value, and a signal generated by the means. an actuating section that operates to complete drying; the signal generating means is a bridge circuit incorporating each of the temperature detection elements and a variable resistor, and the variable resistor variably sets a set value of the detected temperature difference. A switchable dryer.