JPS62117597A - Recirculation type 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 (a) Industrial Application Field The present invention includes a circulating air path that cools the exhaust air from the drying chamber with a dehumidifier to remove moisture, then reheats it with a heater and supplies it to the drying chamber. This invention relates to a circulating clothes dryer.

(B) Prior art In a conventional circulating clothes dryer, there is a first 16 heat element that measures the temperature of the air before it passes through the dehumidifier in the circulation air path, and a temperature of the air after it passes through the dehumidifier in the circulation air path. It is desirable to automatically control the dryer based on the temperature difference with the second heat-sensitive element that measures the temperature. For example, see Japanese Patent Application Laid-Open No. 60-75099. Automatic control was difficult because the temperature difference between the first and second heat-sensitive elements did not reach a constant value. As an improvement plan, for example, as shown in Japanese Patent Application No. 59-80521, as a control method for a minute load, the temperature difference between the first and second specific times during the heating period is defined as the heating temperature difference. If it is above a predetermined upper limit, it is considered as no load and the process is terminated, and if it is below the upper limit, it is considered as a small load and the predetermined value is changed and automatically controlled. For this reason, there is a problem in that a special control program is required for automatic control of minute loads and automatic control of special loads, resulting in a large number of programs.

(c) Problems to be Solved by the Invention The present invention solves the drawbacks of the prior art in that a special control program is required in the case of a very small load or a special load, resulting in a large number of old programs. This allows the drying operation to be completed in a short period of time to avoid wasting power consumption due to wasted operating time.

(d) Means for solving the problem The circulating clothes dryer of the present invention cools the IJ air from the drying chamber with a dehumidifier to remove moisture, then reheats it with a heater and supplies it to the drying chamber. In the device having a circulating air path, a humidity sensing element is disposed in the circulating air path between the drying room and the dehumidifier, and after a predetermined time has elapsed from the start of operation, the humidity sensing element outputs a voltage proportional to humidity. is obtained, and when the output 1 pressure reaches a substantially constant value, that voltage value is stored as a reference value, and the drying operation is terminated when the subsequent output voltage value reaches a predetermined value or less than the reference value. It is characterized by the fact that it is made to do so.

(E) Function The humidity sensing element outputs an output tlE proportional to the humidity due to moisture coming out of the clothes stored in the drying chamber, and the output voltage allows the circulation type clothes dryer to operate stably and even under very small loads. Easily identify and drive automatically.

(F) Embodiment An embodiment of the present invention will be explained based on the drawings. (1) is an outer box whose rear opening is covered with a back plate (2), and a clothes slot (4) which is opened and closed by a door (3) is provided on the front side. (6) is a drum that serves as a drying chamber for storing clothes, and a front plate (9) is fixed to the front end of its peripheral wall (7).
The edge of this front plate (9) is connected to the outer periphery flange (12) of the drum support plate (11) fixed to the front surface of the outer box and the felt (
13) etc. are fully fitted through the sliding member. drum(
6) A shaft (14) is protruded from the center of the rear wall (8), and the metal (17) is inserted into the 111 (16) formed at the center of the support plate (15). ), and a tapping screw (19) is screwed into the tip of the shaft (14) through a washer (18).
It is designed so that it does not come out from the tube (16). Support plate (
15), both ends of which are fixed to flanges (20) and (21) formed at the rear ends of the upper and lower surfaces of the outer box (1), as shown in FIG. The rear wall (8) of the drum (6) is provided with a plurality of air discharge holes 22), and the rear duct (23) communicates with the inside of the drum (6) through the discharge holes (22). It is fixed to the support plate (15). The discharge hole (22) has a removable filter cover (24) having a filter net (24).
25). (26) is the rear duct (23
) and the rear wall (8) of the drum (6). The outlet (33) of the rear duct (23)
) is connected to the suction duct (36) of the circulation fan casing (35) via a connecting vibe (34). Inside this fan casing (35), a circulation fan (37>) consisting of a centrifugal fan is provided as shown in FIG.

This fan (37) is connected to a motor (41) by a small pulley (39) fixed to its shaft (38) and a belt (40).
It is rotated by being connected to a large pulley (43) fixed to a shaft (42). Shaft (42) of motor (41)
A small pulley (44) can also be fixed, and by winding a belt (45) between this small pulley 44) and the outer periphery of the drum (6), the drum (6) can also be allowed to rotate at a low speed.

In FIG. 2, (46) is an idler pulley that adjusts the tension of the belt (45). Circulation fan casing (35)
The discharge duct (47> is connected to a large number of vibrators (48) of the dehumidifier (48).
49). The dehumidifier (48) consists of a large number of vibrators (49) and a large number of cooling fins (50) orthogonal to the vibrators. In Fig. 3, (51) is a cooling fan, which is installed in a cooling fan casing (52), and the suction duct (53) of this casing (52) is an outside air intake opening on the top surface of the outer box (1). (54). The cooling fan (5 pieces) is fixed to the shaft 38) of the circulation fan (37). Then, as the cooling fan (51) rotates, outside air is sucked through the outside air intake port (54) through the filter (61) as shown by the dotted line arrow in Figure 3, and sent to the cooling fins (50).
9) A cooling air path is formed by cooling the moist, warm air passing through the inside, condensing the moisture contained in it, and exiting it through the numerous exhaust holes (56) provided on the bottom of the outer box (1). do.

There is a front duct (57) on the other end of the large number of vibrators (49).
One end is read directly and the condensed water is passed through this front duct (
The water is drained out of the machine from the drain hose '(58) connected to the bottom of the unit 57). The other end of the front duct (57) is connected to the drum support board (11), and the drum support board (11) has a large number of air intakes that communicate between the inside of the front duct (57) and the inside of the drum (6). A hole <59> is provided. Mata Daku 1
- A heater (60) is installed inside (57).

Then, when the heater (60) is energized and the motor (41) is rotated, the circulation fan (37>) and the cooling fan (
51) and the drum (6) rotate, air heated by the heater (60) is supplied from the intake hole (59) to the inside of the drum (6) as shown by the solid arrow in FIGS. 3 and 4, and the air inside the drum is Moisture is allowed to evaporate from the clothes, and this hot and humid air is discharged into the rear duct (23) through the filter cover (25) and the discharge hole (22), and the continuous vibrator (34) is discharged from the rear duct (23). through the pipes (49) of the dehumidifier (48), where it is cooled and the moisture contained therein is condensed as described above, and then sent to the front duct (5).
7) to the heater (60) and heated again.
The solid arrows represent the circulation air path, which repeats the cycle of being supplied from the intake hole (59) to the drum (6). Inside the circulation fan casing (35> discharge dug) (47) is a humidity sensing element (47) for measuring the humidity of the air before passing through the dehumidifier in the circulation air path, that is, the drum outlet humidity.
61) is provided. Here, humidity sensitivity 9T-(61)
Ceramic humidity sensors are used as

Next, the control circuit will be explained based on the number ζ in Figure 5, (63)
is the power switch, (64) is the first door switch, (41)
) is the motor, and <60> is the heater.

(65) is a DC converting circuit, and the waveform shaping circuit (66) converts the DC voltage rectified into rectangular wave pulses into a rectangular wave pulse, which is then applied to a microcomputer (67) and used for time counting. (68) is a clock oscillation circuit that generates pulses used to advance the program in the microcomputer (67).

Reference numeral 69 denotes an initial reset circuit, and when the source switch (63) is pressed, this initial reset circuit is activated and the program in the microcomputer (67) is set to its initial state. (70) is a thermistor for temperature compensation, (62) is a square wave generation circuit for operating the humidity sensing element (61), and (71) is a circuit for logarithmically converting the output of the fan humidity sensing element (61). The divided voltage value is input to the voltage comparator (72). The other input terminal of the voltage comparator (72) receives an output signal from a ladder circuit (74) which generates a staircase wave upon receiving the output from the microcomputer (67). This ladder circuit is connected to the output terminals (A), (B), ... (G) of the microcomputer (67), and as signals are sequentially output from each output terminal, the output voltage of the ladder circuit (74) increases. When the voltage comparator (72) becomes conductive and there is an input to the microcomputer (67), it is a signal from any of the output terminals (A), (B), ... (G). The microcomputer (67) itself determines whether this is the time when the drum exit humidity of the circulation air path is known. (77) is a second door switch for determining whether or not the clothes loading door is closed. (78) is 5
The 0/60HztU conversion switch (75) is a start switch for starting the drying operation. (79> is the first
When the start switch (75) is pressed in the relay winding, the first relay contact (79a) is closed via the microcomputer (67) and the motor (41) is energized. Also, (80) is the second relay winding, (8
1) is a light emitting diode for displaying the drying operation, and when the drying process has progressed, a signal output from the microcomputer (67) causes the light emitting diode (8) to be activated via a transistor.
1) and lights it up to indicate that the drying process is in progress, and at the same time, energizes the second relay winding (80) to close the second relay contact (80a) and switch the first door switch (6).
4) etc., the heater <60) is energized. (84) is a buzzer for ending operation, (85) is a 1" light emitting diode for indicating cold air operation that lights up during cold air operation, (8
6) is a tfl plug. In addition, (87) is a moisture sensitive element (
61) is a ceramic heater for heating and cleaning that is integrated into the heater.

The operation of the above configuration will be explained below. When the power-on switch (63) is pressed, DC voltage is applied to the microcomputer (67) through the DC conversion circuit (65), and the initial clear circuit (69) is activated to set the program in the microcomputer to its initial state. do. The program is sequentially advanced by signals from the clock oscillation circuit (68), but first the humidity sensing element (61) and the ladder circuit (74)! The drum outlet humidity is measured at 1 second intervals by a pressure comparator (72), and the values are stored in 4 m of RAM in the microcomputer (67). If the start switch (75) is pressed and the clothes loading door 3) is closed, the first and second door switches (64) (77) are closed, and the second door switch (77) is closed. The microcomputer (67) detects and outputs an output current to the first relay winding (79), causing the first relay contact (7
9a) and energize the motor (41) to turn the drum (6)
At the same time, both the fans (37) and (51) are rotated, and at the same time, a single output current is output to the second relay winding (80), the second relay contact (80a) is closed, and the heater (60) is energized to dry. Start driving. Also microcomputer (67)
The operation time is counted by counting the number of pulses of the power AC wave converted into a rectangular wave by the waveform shaping circuit (66). This counting is done by using a specific address in the RAM as a time counter, and the time counted and stored here is updated every minute.

Next, examples (1), (2), (3) will be explained based on FIG.
) Figures 7(a), 7(b), and 7(c) show the fluctuation curves of fixed load, overload, and special load, respectively. To explain the control method in 3), immediately after starting the drying process, the moisture sensing element (
61) is determined as II+, and this is set as the initial value (
A). If the drying operation continues after that, the output voltage will increase rapidly, but for a predetermined period of time (T
I) The output voltage value after the elapsed time is set as the reference value (B). When this reference value is stored, examples (1) and <2> have reached a steady state, but in example (3), the voltage value is in a fluctuating state. Therefore, in example (3), even if a voltage value higher than the reference value (B) is generated after storing the reference value (B), that voltage value is considered invalid and is not stored. Here, we compare the initial value (A) and the standard value (B) and check whether the result is (A<B).We proceed to the next step by checking the circle, but in this case, we are sure that (
A < B), so next we define C as the cold air transition reference voltage. This C is calculated by the reference value BXI/, and this k is set to a predetermined constant. Then, the output voltage After passing through a steady state, it rapidly decreases, and when the cold air transition reference voltage IEC is reached, a transition to cold air operation is made.

Here, the microcomputer (67) outputs a cleaning output, energizes the cleaning heater (87), and senses /! The J element (61) is heated and cleaned.

This time is about 1 minute at most. Thereafter, the cold air operation is stopped after a certain predetermined time (T2) has elapsed.

Next, examples (4) and (5) (see FIG. 7(d) and FIG. 7(e)) will be explained. They show a small amount load and a very small amount load, respectively. In this case, the output voltage increases and then decreases immediately after a while, but this case can also be controlled by the control method described above.

Next, let us explain about example (6) (see Fig. 7 (f')). This shows no load, but in this case, the reference value (B
) and the initial value (A), it becomes (A>B), so it is possible to determine that there is no load, shift to cold air operation, and stop the operation.

Next, referring to FIG. 8, this flowchart shows the control method described so far. A
is the voltage value immediately after starting drying operation as the initial value,
B is the voltage value when the elapsed time reaches TI as the reference value, C is the voltage value calculated from the reference value of B, and D is the load difference between the reference value (B) and the initial value (A). E is the reference voltage for transitioning to cold air operation.

Further, T1 indicates the elapsed time (10 minutes in this example) for storing the reference value (B), and T2 indicates the maximum operating time (150 minutes in this example), which is the time for the humidity sensing element (61 minutes).
), etc., is a failure.

(G) Effects of the Invention According to the present invention, the humidity due to moisture coming out of clothes is detected by a humidity sensing element and an output voltage proportional to the humidity is obtained. The rate is also the same, and the clothes drying operation can be automatically terminated regardless of the amount of clothes loaded.

Therefore, no special program is required even if there is a very small load or a special load, and no load can be quickly determined and the clothes drying operation can be stopped.

[Brief explanation of drawings]

The drawings all show embodiments of the circulating clothes dryer of the present invention,
Figure 1 is a front view, Figure 2 is a rear view with the back plate removed, and Figures 3 and 4 are the I-I' line and m-
Fig. 5 is a control circuit diagram, Fig. 6 is a humidity sensor control circuit diagram, Fig. 7 is a variation curve diagram of output voltage at various clothing loads, and (a) is a diagram for a fixed load. (b) is a fluctuation curve diagram of overload, (c) is a fluctuation curve diagram of special load, (d) is a fluctuation curve diagram of small load,
(e) is a variation curve diagram for a minute load, (f') is a variation curve diagram for no load, and FIG. 8 is a flowchart. (6th drum, (48), dehumidifier, (61)
... Moisture sensing element, (87) ... Ceramic heater for heating cleaning.

Claims (1)

[Claims] (1) In a device having a circulation air passage that cools exhaust air from a drying room with a dehumidifier to remove water, reheats it with a heater, and supplies the air to the drying room, the exhaust air between the drying room and the dehumidifier is A humidity sensing element is disposed in the circulating air passage, and after a predetermined time has elapsed from the start of operation, the humidity sensing element obtains an output voltage proportional to humidity, and when the output voltage reaches a substantially constant value, the voltage value is determined. A circulating clothes dryer characterized in that the drying operation is ended when the output voltage value is stored as a reference value and the subsequent output voltage value reaches a predetermined value or less than the reference value.