JPS60222095A - 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 invention dehumidifies exhaust gas from a drying room by heat exchange.
With n number 1, I searched for #IbI and tried to deceive and rescue Nasu.

(b) Prior Art Regarding this type of clothes dryer, for example, Japanese Patent Application Laid-Open No. 58-180
What is shown in Publication No. 199 is a drying operation in which a constant drying period (a period in which the measured temperature difference in the drying chamber is approximately constant) is followed by a lapse rate drying period (a period in which the measured temperature difference increases again). Can be controlled.

That is, as shown in Fig. 5, the temperature difference is measured after a predetermined preheating period from the start of operation and is used as a reference value. It is determined that the period has shifted to the decreasing rate drying period, and the drying operation is terminated.

However, this conventional example cannot cope with a very small amount of load such as only a few handkerchiefs, or when the load is made of synthetic fibers. That is, when a small amount of load or the load is a synthetic fiber, the measured temperature difference becomes one hour characteristic as shown in Figure 6, and there is a constant drying period, and most of the water evaporates during the preheating time. As the drying period begins, the temperature difference after the reference value is memorized will gradually rise as it attempts to reach the saturated state, making it difficult to reach a temperature difference of (reference value + predetermined value) or more, resulting in overdrying. There was a drawback.

(C) Purpose of the Invention The present invention is capable of ending a drying operation in a good drying state regardless of the amount of load, even when the load is very small or for synthetic fibers, and also allows drying to be completed without any load. If so, the drying operation can be completed in a short time, thereby preventing wasted operating time and unnecessary power consumption.

(d) Structure of the Invention The clothes dryer of the present invention heat-exchanges the exhaust gas from the drying chamber to remove moisture, and then reheats it with a heater and supplies it to the drying chamber. A first heat-sensitive means for measuring the temperature of the exhaust gas at the outlet of the drying chamber, a second heat-sensitive means for measuring the temperature of the exhaust gas after heat exchange or the temperature of the outside air for heat exchange after the heat exchange; a storage means for storing the difference in temperature measured after a predetermined time as a reference value; and if the reference value is greater than or equal to a predetermined upper limit value, the drying operation is terminated; and if the reference value is below the upper limit value ν, the drying operation is terminated; A combination of a first control means for changing the predetermined value in accordance with the reference value, and a second control means for terminating the drying operation when the measured temperature difference reaches the sum of the reference value and the predetermined value. When the measured temperature difference exceeds a predetermined upper limit during the heating period, it is determined that there is no load and the drying operation is terminated. A-C also adjusts the drying end point by changing the predetermined value according to the temperature difference, and can handle even a small load.1. The drying operation is configured to end after the specified drying time.

(e) Example Based on FIGS. 1, 2, and 3, (1
) is a metal machine frame of a clothes dryer, and a resin front plate (2) and a metal rear plate (3) are fixed to the front and rear opening edges. <April Clothes entrance/exit formed on the front panel (2),
(5) is the door that opens and closes this entrance, (6) is the machine frame (1)
A metal annular drum support plate (7) is located at the front of the machine frame (1) and fixed to the front plate (2).
) is a metal partition plate placed at the rear of the interior. Here, the drum support plate (6) and the partition plate (7) are made of thick sheet metal, and the partition plate (7) is installed on both sides of the machine frame (1) and firmly fixed, and extends radially from the center. Multiple vents (
8〉... is drilled.

(9) is a long support shaft that is inserted through the center of the partition plate (7) from the front and rear directions and is fixed, and its rear end is connected to the rear plate (3).
It is fixed to the central boss (10) which bulges out to the rear with bolts and washers.

(11) is a resin-molded drum serving as a drying chamber, and the front opening edge is attached to the outer peripheral edge of the drum support plate (6) with felt (12).
) and are rotatably fitted. A bearing (13) is fixed to the center of the rear surface of the drum (11), rotatably inserted into the front end of the support shaft (9), and prevented from being removed with bolts and washers. Furthermore, this drum (1
1) is formed with a hot air outlet (14) consisting of a large number of through holes or radial slits on the rear surface.

A sole member (15) is made of felt or the like and is fixed to the rear surface of the drum with an adhesive or the like, and is in sliding contact with the front surface of the partition plate (7).

(16) is a circulation path that connects the hot air population (17) formed on the lower left side of the drum support plate (6) to the ventilation hole (8) of the partition plate (7) from the rear side of the plate. Enter IJ (17>
A cam-shaped heater (18) made of a positive temperature coefficient thermistor is provided opposite to L, which is fixed to the drum support plate (6).
The cylindrical circulation casing (2) is airtightly covered and fixed to the rear surface of the letter-shaped duct 1-(19) and the partition plate (7).
0). The circulation casing (20) is a resin molded product, and is integrally formed with a downward circulation pipe (21), which is connected and communicated with the duct (19) at the inner bottom of the machine frame (1). 19> has a drain hole (22) vertically provided at the bottom that projects outside the machine.

(23> is a resin cooling casing of almost the same shape that is fixed to the rear side of the circulation casing (20) so as to be continuous with it, and a downward exhaust pipe (24) separated from the circulation pipe (21).
is integrally formed, and this is connected to the exhaust port (25) on the bottom of the machine frame (1).
). And this cooling one-thing (2
3> and the rear part of the exhaust pipe (24) are covered by the rear plate (3).

(26) is a heat exchange type double-sided fan disposed across the circulation casing (20) and the cooling casing (23), and is rotatably supported on the rear part of the spindle (9>) via metal. (27) is a rotation transmission pulley connected to this fan (26).

(28) is a motor installed at the inner bottom of the machine frame (1),
The drum (11) is rotated by a pulley including an idler pulley and a belt, and the pulley and fan (
26) is rotated via a belt.

(29) ... is an air intake port radially drilled in the central bulge of the rear plate (3), and (30) is a bulge in the rear plate (3) to cover the area where the belt is stretched. This is the formed cover.

(31) is a filter device installed from the inside so as to cover the hot air outlet (14) on the rear surface of the drum (11).

Further, (32) is a first thermistor located on the back side of the partition plate (7) to detect the exhaust temperature of the drum outlet (14);
(33) is a second thermistor that is located in the duct (19) and detects the temperature of the exhaust gas after mechanical heat exchange and dehumidification.

In addition, this second carmister (33) is a double-sided puan (26).
Alternatively, if a dehumidifier is separately provided, the temperature of the cooling outside air after passing through the dehumidifier may be detected.

Next, the circuit configuration will be explained based on Fig. 4. (34)
is the power switch, (35) is the first door switch, (36
) is a DC converting circuit. (37) is a waveform shaping circuit that converts a commercial frequency AC voltage into a rectangular wave pulse and applies it to a microcomputer (hereinafter referred to as microcomputer) (38).
Use for time counting. (39) is a clock oscillation circuit that advances the program in the microcomputer (38).
(40) is an initial reset circuit which sets the program in the microcomputer (38) to the initial state when the power switch (34) is pressed.

(41>(42> is the above first and second thermistor (32)
(33) is a voltage comparator circuit that divides the voltage value with a resistor and inputs it, and the other input terminal is the output signal of the ladder circuit (43) that generates a staircase wave upon receiving the output from the microcomputer (38). is entered. Here, the ladder circuit (43
) is connected to the output terminals (a) to (g) of the microcomputer (38), and changes the ladder output stepwise as signals are sequentially output from each output terminal.

The microcomputer (38) receives a signal from any of the output terminals (A) to (G) when there is an input to the input terminals (J) and (S) due to conduction of the voltage comparator circuits (41) and (42). The microcomputer (38) itself determines when the temperature is reached and knows the respective temperature. (44) is a second switch for determining whether the door (5) is closed, and (45) is a start switch.

(46) is turned on by the output signal from the microcomputer (38)
L.

(47) is a triac that energizes the motor (28), (47) is ONL based on the output signal from the microcomputer (38), and (4j) is a triac that energizes the heater (18). .

Thus, during drying work, power is supplied to the motor (28) and heater (18), and the fan (26) and drum (11) are powered.
Rotate.

Thus, the drying air heated by the heater (18) is distributed between the hot air inlet (17), the drum (11), and the filter device (31).
- Hot air outlet (14) - Vent (8) - Fan (26) -
Circulation casing 20) - circulation pipe (21) - duct (1
9) - Heater (18>) to dry the clothes in the drum (11). On the other hand, outside air is circulated through the air intake (29) - cooling casing (23) - fan (26) - cooling pipe (24).
)-exhaust port (25).

Then, heat exchange is performed between the front and rear surfaces of the fan (26),
The drying air discharges the moisture coming out of the clothes in the duct (19) and is discharged as drain from the drain hole (22), and the air itself is circulated with its humidity reduced.

Next, to explain the control operation, after the power switch (34) is closed, the start switch (45) is depressed and the seventh
As shown in the figure, the temperature measured by the first and second thermistors <32) (33) is the input terminal (38) of the microcomputer (38).
After detecting that 5 (5) is closed, the motor (28) and heater (18) are energized to start heating and drying operation. The measured temperature is always updated to the latest value from the start of operation until the operating time (tl), which is a predetermined heating period, is reached. This operating time (tl) was selected to be 15 minutes as a result of various experiments.

When the operating time reaches 15 minutes, the measured temperature difference between the first and second thermistors (32) (33) at that time is set as the reference value (A).
and 5 deg as a predetermined value (B), respectively, are stored in the microcomputer (38), and then this reference value (A) is compared with a predetermined upper limit value (30 deg),
If the reference value (A) is greater than or equal to the upper limit (30 degrees), it is determined that the drying operation is no-load operation, the drying operation is ended, and the entire process is completed by performing a cold air operation for 5 minutes. In addition, the reference value (A
) is below the upper limit (30 deg) and the measured temperature difference between the first and second thermisters (32) and (33) rises to a value greater than the sum of (A), and this state remains for a predetermined period of time (3 minutes). ) If this continues, the microcomputer (38) will judge that the load of clothes etc. has been sufficiently dried, and during this operating time (T), the heater (18) will be turned off to 0FFu to shift from drying operation to cold air operation, and after 5 minutes the entire process will be completed. Finished.

For safety, when the operating time reaches 200 minutes, the entire process is completed after shifting from drying operation to cold air operation.

(F) Effects of the Invention According to the present invention, since the reference value (A) exceeds the upper limit when drying is performed without a load, the drying operation can be completed regardless of the outside temperature, and the drying process can be carried out with just a few handkerchiefs. Even if the load enters the lapse rate drying period during the preheating period, such as in the case of minute loads or synthetic fibers, the reference value (A) can be maintained by reducing the predetermined value (B). ) and the predetermined value (B) to easily reach a constant temperature difference of π1j, and therefore a clothes dryer that does not waste power as in the prior art can be obtained.

[Brief explanation of drawings]

The drawings all relate to an embodiment of the clothes dryer of the present invention, and FIG. 1 is a side sectional view, FIG. 2 is a rear sectional view, FIG. 3 is a front view of main parts, FIG. 4 is an electric circuit diagram, and FIG. The figure is a general temperature difference one hour characteristic diagram, FIG. 6 is a temperature difference one hour characteristic diagram in the case of a minute load, and FIG. 7 is a flow chart A. (11)...Drum (drying room), <18>...
Heater, (26)...Heat exchange type double-sided cyan, (32
)...First thermistor (first heat sensitive means), (33
)...Second thermistor (second heat sensitive means>, (38)
...Microcomputer. Applicant Sanyo Electric Co., Ltd. Agent Patent Attorney Shizuo Sano

Claims (1)

[Claims] (1) In a clothes dryer where the exhaust air from the drying chamber is heat-exchanged to remove moisture, then reheated by a heater and supplied to the drying chamber, the exhaust air at the outlet of the drying chamber is Difference between the first heat-sensitive means for measuring temperature, the second heat-sensitive means for measuring the temperature of exhaust gas after heat exchange or the temperature of outside air for heat exchange after heat exchange, and the measured temperature a predetermined time after the start of operation. storage means for storing the reference value as a reference value; and if the reference value is greater than or equal to a predetermined upper limit value, the drying operation is terminated, and if the reference value is less than or equal to the upper limit value, the predetermined value is changed in accordance with the reference value. and a second control means for terminating the drying operation when the measured temperature difference reaches the sum of the reference value and the predetermined value.
control means;