JPS6057360B2 - Dryer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for heating intake air and supplying it into a drying chamber.
The present invention relates to a dryer configured to discharge hot air from which moisture has been removed from a drying chamber, and particularly to a dryer configured to stop hot air drying by detecting the temperature of the exhaust air from the drying chamber.

Conventionally, in a dryer that dries the material to be dried in the drying chamber by drawing in outside air and heating it with a heater while supplying it to the drying chamber, the temperature of the hot air discharged from the drying chamber, that is, the exhaust temperature, has traditionally been adjusted to By utilizing the property that the drying rate of the object increases as the drying rate increases, the heater is configured to cut off the power to the heater and stop hot air drying when the exhaust temperature reaches a set value corresponding to the desired drying rate. is provided.

However, the rate of increase in exhaust temperature varies depending on the outside temperature, and therefore, in the conventional configuration described above, the timing at which the exhaust temperature reaches the set value varies greatly depending on changes in outside temperature. Therefore, there were nine colors which made the timing of stopping hot air drying inaccurate, and there was a great possibility that the drying material would be under-dryed or over-dryed. The present invention has been made to eliminate the above-mentioned drawbacks, and its purpose is to:
In a device in which hot air drying is stopped by detecting the temperature of the exhaust air from the drying chamber, there is no risk that the timing of stopping hot air drying will be inaccurate due to the influence of outside temperature; To provide a dryer capable of preventing the occurrence of situations such as under-drying or over-drying of objects to be dried.

An embodiment of the present invention will be described below based on the drawings.
First, in FIG. 1 showing the general structure of the whole, numeral 1 denotes a rotating drum serving as a drying chamber, which is rotatably supported in an outer box 2, and by its rotation, the items to be dried inside, such as clothes, are removed. Stir.

Reference numeral 3 denotes a motor disposed at the lower part of the outer box 1, which rotates the rotary drum 1 via a belt 4, and
The fan 6 inside the fan casing 5 is rotated.

When the fan 6 is rotated, outside air is sucked into the outer box 2 through the intake hole group 7, and the sucked air is diffused by the air expansion plate 8 and is then passed through a heater for generating hot air provided on the air expansion plate 8. 9, and is supplied into the rotating drum 1 through a rear ventilation hole group 10. The hot air that has removed moisture from the clothes in the rotating drum 1 is discharged into the fan casing 5 through the air gap 12 formed around the door 11 and the filter 13, and then through the exhaust duct 14 outside the outer box 2. is discharged into
In this way, the clothes in the rotating drum 1 are dried with hot air. Reference numeral 15 denotes a temperature detection element, which is arranged, for example, in the exhaust passage between the filter 13 and the fan casing 5 so as to detect the temperature of the hot air discharged from the rotary drum 1 through the air gap 12 and the filter 13, that is, the exhaust temperature. It is set up.

By the way, it has been experimentally revealed that when the clothes in the rotating drum 1 are dried by hot air drying as described above, the exhaust temperature detected by the temperature detection element 15 changes as shown in FIG. ing. That is, in FIG. 2, the horizontal axis represents the drying rate D (%) of the clothing (drying rate 1
00% does not mean zero moisture and is an artificially determined target value), and the vertical axis represents the exhaust temperature detected by the temperature detection element 15, that is, the detected temperature T (Deg), respectively.
The rising curve of the detected temperature T when the temperature of the intake air, that is, the outside temperature is 5°C, is shown in a, and similarly, when the outside temperature is 20°C and 35°C,
C. The rise curves of the detected temperature T in each case are shown in b and c, respectively. As can be understood from Fig. 2, there is a period during which the rate of increase in the detected temperature T is temporarily saturated at a drying rate of about 75% during hot air drying (Al, bl, cl in Fig. 2).
), and the detected temperature T rises again thereafter. Therefore, for each temperature characteristic curve A, b, and c, if we focus on the drying rate D when the detected temperature T rises by, for example, 7 degrees after the above-mentioned saturation period, it can be seen that the drying rate is approximately 95% in each case. . In other words, the temperature increase value of the detected temperature T after the saturation period has a characteristic that corresponds numerically to the drying rate of the clothing, regardless of the outside temperature. The feature of the present invention is that it utilizes the above characteristics, and its specific configuration will be explained with reference to the block diagram of FIG. 3.

That is, 16 is a temperature increase rate determination circuit, which will be described first. 17 is an oscillator that generates a clock pulse at a rate of, for example, one per minute; 18 is a temperature reading unit to which the clock pulse is input to its clock input terminal Ck; In other words, every minute, the exhaust temperature detected by the temperature detection element 15, that is, the detected temperature T is read, and the detected temperature value Tn read in this way is output to the subsequent stage.

19 is a memory element that temporarily stores the detected temperature value Tn output from the temperature reading section 18; 20 is the detected temperature value Tn from the temperature reading section 18 and the detected temperature value TO one minute ago stored in the memory element 19; This comparing section 20 compares the above-mentioned detected temperatures Km and TO from TO<Tn to TO≧
When the relationship Tn changes, it is assumed that the rate of increase in the detected temperature T is saturated, and a latch signal is output.

Reference numeral 21 denotes a saturation temperature storage section, which stores the detected temperature value Tn from the temperature reading section 18 as the saturation temperature value Ts when the latch signal is input to its latch terminal R.

Reference numeral 22 denotes a drying rate setting unit, which sets a predetermined temperature value (7 when setting the drying rate of clothes at the end of hot air drying to 95 to 100%) with respect to the saturation temperature value Ts from the saturation temperature storage unit 21. ~14deg) and set this as the set temperature value T.
Output as p.

On the other hand, 23 is an operating circuit, which will be described below. 24 is a comparison section, which compares the detected temperature value Tn from the temperature reading section 18 and the set temperature value Tp from the drying rate setting section 22.
When the relationship Tn≧Tp is established, a stop signal is output and this is output to the operation stop circuit section 25.

The operation stop circuit section 25 cuts off the power to the heater 9 when the stop signal is input, thereby stopping the hot air drying described above. Next, the action will be explained.

Now, when the outside temperature is, for example, 20C, the drying rate of the clothes in the rotating drum 1 increases as the hot air drying described above progresses, and the temperature detection element 15 follows this increase in the drying rate. The detected temperature T increases as shown by the temperature increase curve b in FIG. During such hot air drying, when the drying rate is in the range of about 70 to 80%, the moisture in the clothes in the rotating drum 1 actively evaporates, and the detected temperature T remains approximately constant (15 deg.
g), and the period during which the rate of increase in the detected temperature T is temporarily saturated continues for several minutes. At this time, the temperature reading section 18 reads the same detected temperature (15 degrees) from the temperature detection element 15 every minute and simultaneously outputs this as the detected temperature value Tn. Therefore, the detected temperature value Tn from the temperature reading section 18 received by the comparison section 20 and the storage element 19
The detected temperature values TO one minute before become equal, so that the comparator considers that the rate of increase in the detected temperature T has been saturated and outputs a latch signal. Then, upon receiving this latch signal, the saturation temperature storage section 21 converts the detected temperature value τn=Rl5J from the temperature reading section 18 at that point into the saturation temperature value T.
While storing as S=Rl5J, the drying rate setting section 22
is added to the saturation temperature rate TS=Rl5J and a preset temperature value, for example, R7, and this is set as the set temperature value TP.
Output as =R22. At this point, driving circuit 2
Since the detected temperature value Tn=Rl5 which is compared by the comparator 24 in 3 is in the relationship Tn<Tp with the set temperature value Tp, the comparator 24 will not output a stop signal and the hot air drying will continue. Continued. After that, when the saturation period of the increase rate of the detected temperature T has passed, the detected temperature T starts to rise again, and when the drying rate reaches approximately 95%, the detected temperature T increases to 22%.
When the temperature rises to deg, the detected temperature value τn=R22 is output from the temperature reading section 18. Then, the detected temperature value Tn and the set temperature value Tp, which are compared by the comparator 24, become Tn=Tp.
Accordingly, a stop signal is output from the comparison section 24, and the operation stop circuit section 25, which has received this stop signal, starts the heater 9.
Turn off the power to stop hot air drying. Therefore, the clothes in the rotating drum 1 are dried to a drying rate of about 95%. Also,
Even when the outside temperature is different from the above case (20° C.), the clothes in the rotating drum 1 are dried to a drying rate of about 95% by the same action as described above. It goes without saying that the object of the present invention is not limited to rotary drum dryers or clothes dryers.

As understood from the above description, the present invention is a dryer configured to heat intake air and supply it into a drying chamber, and then exhaust the hot air from which moisture has been removed from the drying chamber. There is a phenomenon in which there is a period in which the rate of increase in the temperature of the exhaust gas from the room is temporarily saturated, and the increase in the temperature of the exhaust gas after such a saturation period is the drying rate of clothes and other items to be dried, regardless of the outside temperature. It is characterized in that it utilizes the characteristics of numerical correspondence.

That is, a temperature detection element detects the temperature of the exhaust gas from the drying chamber, and a period during which the rate of increase in temperature detected by the temperature detection element temporarily saturates during hot air drying is determined, and the saturation temperature at that time is memorized. A configuration that includes a temperature increase rate determination circuit and an operation circuit that stops hot air drying when the detected temperature rises after the saturation period of the detected temperature and the difference between this and the saturation temperature becomes a set temperature or more. By doing so, the hot air drying is stopped depending on the increase in the exhaust temperature after the saturation period described above, so the timing of stopping the hot air drying becomes inaccurate due to the influence of the outside temperature. There is no risk of drying, and it is possible to prevent situations such as under-drying or over-drying of the material to be dried.

[Brief explanation of the drawing]

The drawings are for explaining one embodiment of the present invention. FIG. 1 is a schematic longitudinal sectional side view of the whole, FIG. 2 is a temperature characteristic curve diagram of exhaust temperature, and FIG. 3 is a block diagram of the electrical configuration. In the figure, 1 is a rotating drum (drying chamber), 9 is a heater, 15 is a temperature detection element, 16 is a temperature rise rate determination circuit, and 23 is an operating circuit.

Claims (1)

[Claims] 1. A device configured to heat the intake air and supply it into the drying chamber, and then exhaust the hot air deprived of moisture from the drying chamber, including a temperature detection element that detects the exhaust temperature from the drying chamber, and a temperature detection element that detects the temperature of the exhaust air from the drying chamber, and a temperature detection element that detects the temperature of the exhaust air from the drying chamber, and a temperature increase rate determination circuit that determines a period in which the rate of increase in temperature detected by the temperature detection element is temporarily saturated and stores the saturation temperature at that time; and an operating circuit that stops hot air drying when the difference between the saturation temperature and the saturation temperature exceeds a set temperature.