JPS58163400A - Clothing drier - 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 present invention relates to a clothes dryer that automatically terminates operation while restricting the level of care for clothes.

In conventional clothes dryers, the operating time is set by a timer, and the operation automatically ends when the set time elapses, and there is a difference between the exhaust temperature and the exhaust temperature. Some cars automatically stop running when the measured value reaches a certain value.

However, when using a timer to set the operating time, it is necessary to change the set time depending on the amount of laundry, type of fiber, dehydration rate, etc., and it is not always easy to set the optimal time. If the machine operates while only the difference between temperature and exhaust temperature or exhaust humidity is constant, the exhaust temperature at the end of drying will vary depending on the amount of laundry, so it is a good idea to set the temperature at the end of operation in advance. It was not possible to obtain the desired dry finish.

The present invention uses a microcomputer, stores the value in the microcomputer when the difference between the intake air temperature and the exhaust gas temperature reaches a substantially constant value after the start of operation, or when the exhaust gas temperature reaches a constant value and runs, and uses the stored value. The drying operation is also terminated when the temperature reaches a predetermined value or higher, or after a predetermined period of time has passed. The purpose is to make it possible to obtain the desired drying rate regardless of the conditions.

The present invention will be explained below based on the drawings. (1) is a start switch, 121a is a stop switch, (3) is a motor for driving the drying drum and blower, and (4) is a heater. (5)
is a DC converting circuit, which converts the DC voltage rectified into rectangular wave pulses in a waveform shaping circuit (6), and applies the pulses to a microcomputer (7) for use in time counting. 1) is a clock oscillation circuit, which is used to run the program l1 line f in the microcomputer (7), (
9) is an initial reset circuit, and when the start switch +11 is pressed, this initial reset circuit is activated and the program in the microcomputer (7) is set to the initial state. (to) is intake i! The thermistor ■ for temperature detection is a thermistor for exhaust temperature detection, and each thermistor is connected in series with a resistor (LIOI), and each divided voltage value is input to the voltage comparator circuit a-(2). The other input terminal of the comparison circuit aSS is inputted with an output signal of a ladder circuit (to) which receives the output from the L1 microcomputer (7) and generates a staircase wave.This ladder circuit is connected to the microcomputer (7). Output terminal mark (c4・
...()l, the output voltage of the ladder circuit (to) changes in a stepwise manner as signals are sequentially output from each output terminal, and the voltage comparator circuit 04Qi becomes conductive to the microcomputer (71). When there is an input, the microphone/computer itself determines which of the output terminals (A) (-...1G) the signal comes from and determines the intake air temperature and !111:gLfjA The variable resistor 0αη that is used to know the drying rate is a variable resistor built into the drying rate adjustment timer, and its slider is connected to one input terminal of the voltage comparator circuit (2). The other input terminal is connected to the ladder circuit (2).When the drying rate timer is set to a desired time, the position of the slider of the variable resistor circle is set appropriately, and this slider A voltage comparator (2) compares the partial voltage applied to the voltage and the voltage generated from the ladder circuit (to), and when this comparator becomes conductive and a signal is input to the microcomputer (71), which output terminal )(B)...When the signal comes from (G)?J
You can know the set time by reading Th. (
(2) is a 50/60H3 changeover switch. (2) is the first relay winding, and when the start switch (1) is pressed, the micro combinator (7)
), current flows through the first relay winding through the transistor, and g11JL'- contact (
2) is closed to form a self-holding circuit. Nuhiro@2 relay winding, - is a light emitting diode for displaying dry fog operation, and when the drying process has progressed, the signal output from the microcomputer (7) energizes the light emitting diode (to) via a transistor, and this It lights up to indicate that it is in the drying process, and at the same time energizes the first winding of the second relay (1), closes the second relay contact (to), and energizes the heater 4 through the first door switch w4. ing. The island is the fifth relay winding, and when the start switch (1) is pressed and the wJ2 door switch is closed, the signal output from the microcomputer (7) is passed through to the fifth relay contact (to). Close and energize the motor (3).

The hook is a buzzer to indicate the end of operation, and the fin is a light emitting diode that lights up to indicate cold air operation.

The operation of the above configuration will be explained below. When the start switch lit is pressed, a DC voltage is applied to the microcomputer +71 through the DC conversion circuit 151, and the initial clear circuit 191 is activated to quickly set the program in the microcomputer to its initial state. The program is sequentially advanced by signals from the clock generator circuit (8), but first, the output current is applied to one relay and one winding S (company) to close the V-contact (transfer) and the power supply circuit is self-maintained. 0th order intake wrinkle swelling test - Mostat and Exhaust xii
+11) and ladder circuit Q@voltage comparison I! The intake air temperature and exhaust air temperature are measured by u・(c), and the values are stored in the RAM (
stored in embedded memory). At the same time, the variable resistor surface is set by the dry control knob.
It is digitized by a voltage comparator and stored in the RAM in the microcomputer. When the door for loading type Relay winding 4I-
Output current to the motor (
3) to rotate the drying drum and blower, and at the same time output current to the 21st JV-winding section to rotate the drying drum and the blower.
The two relays and one contact are closed and the heater 14) is energized to start drying operation. Also, microcomputer +711d...
The operating time is counted by counting the number of pulses of the AC wave converted into a rectangular wave by the waveform shaping circuit (6). This counting is performed by using a specific address in the %RAM as a time counter, and the time stored here in terms of the number of stitches is updated every minute.

By the way, the difference between the intake air 'fAWIL and the exhaust gas gL temperature, that is, the intake/exhaust temperature difference, changes approximately as shown in FIG. 2 during dry operation.

That is, the difference in @exhaust temperature 11 increases for a while after the start of the drying operation, but when it reaches a certain temperature difference (4), it suddenly reaches a steady state and hardly changes. After this steady state continues for a while, the ljl exhaust temperature difference starts to increase again, but the drying rate at the time of drying is approximately 80%.

Therefore, in Figure 2, if the Km operation is stopped when the temperature difference between intake and exhaust reaches (MU10B) degrees (where B is a predetermined positive number), the operation will end with a drying rate of 80% or more. can do. In addition, by the drying rate adjustment timer,
+8) By extending the operation by an appropriate amount of time (Ts) after reaching &, you can obtain an arbitrary drying rate of 1.0 This drying rate adjustment timer does not set the total operating time for drying. , (A+B) for a short time (Tm
), there is almost no error in the drying rate due to the amount of particles, type of fiber, dehydration rate, etc.

Note that the time it takes for the intake and exhaust II degree difference to become approximately constant (Ts)
Although it differs slightly depending on the load amount and dehydration rate, the longest time among them was determined by experimenting with various loads and was set as the time (TI),
1ift record the difference in intake and exhaust temperature at that time! ! (4) and n are all you need. Since the steady state in all four cases is an ephemeral long time, the time (T1) may be set to be long enough. In addition, if the suction aMK is constant, measure only the wandering gL warm drum and this in front! , temperature m difference (4) may be used, but when used in a small room, the intake air temperature increases as the drying operation progresses, and it is difficult to obtain time for the temperatures # and (Al to become constant), so the intake air i! It is desirable to measure both wrinkle and exhaust temperature.

As a result of repeating the process, it was found that a steady state is suddenly reached after 10 minutes after the start of operation under any load. Therefore, in this example, the time (T1) tl was set to 0 minutes. . Therefore, when 10 minutes have passed after the start of operation, the memory is constantly updated and stored in the RAM until then.
The LIjA degrees and the exhaust temperature are taken out, the axes thereof are calculated, and the values are stored in another address of the RAM. After that, at the time of death when the intake and exhaust temperature difference becomes (A+5) & (in this example, B is set as 5°C), a new time count is started in addition to the time count from the beginning of operation, and (A+5) When the operating time after reaching the temperature reaches the time set by the dry travel rate adjustment timer, the drying operation ends and shifts to the cold air operation. Note that the new time count may be calculated by subtracting the time counted from the start of operation to C(A+5)II and the time of death, without separating it from the time count from the start of operation.

During dry travel delay @ discharge 9L wrinkle vertical difference is 35℃ or more,
The drying operation is stopped and the operation shifts to cold air operation, but if the small load switch is pressed halfway, 10 minutes of drying operation is guaranteed.If the 0 load is extremely small, the heater will heat the air and the air will flow out with good hot air. Since the air is exhausted as it is and the drying operation is stopped before the laundry is dry, the drying operation is guaranteed for 10 minutes when the small load switch is pressed. Also, when the difference in intake and exhaust temperatures f reaches (A+20), the drying operation is stopped and the cold air operation is started.

This is because if the setting of the drying rate adjustment timer is incorrect, more drying than necessary will not be performed. However, since drying rate adjustment tie 1 counts the time after death when the temperature difference between intake and exhaust reaches (A+5) degrees, it is said that the setting is significantly incorrect compared to the conventional timer that counts from the beginning of drying operation. Never. Furthermore, since the start of operation, 150
Even if the drying operation is still in progress after a few minutes have passed, the operation shifts to the cold air operation. This is to protect against failure of the temperature detection thermistor, etc.

If the door is opened after the start of operation, the microcomputer (71) recognizes this based on the state of the second door switch (to) and the operation start flag, and after 10 minutes has passed, the intake and exhaust temperature [!
! After calculating the tAl tube, the drying operation is interrupted and only the subsequent operation is resumed when the door is closed. However, if the door is opened less than 10 minutes after the start of operation, the time until the 1Ilj#Ii temperature difference is calculated is extended according to the duration of the door opening. In this example, when the door is open for less than 2 minutes, the time t is extended by 1 minute in the trench for measuring the temperature difference between intake and exhaust air (4), and the measurement is performed at the time of death 11 minutes after the start of operation. If the time is more than 2 minutes but less than 5 minutes, the time will be extended by 2 minutes, and if it is more than 5 minutes, the time will be reset from the beginning.

This is because the degree to which the fi & of the laundry decreases depends on the duration of the door being open, and even when drying operation resumes, the time in the trench where it suddenly reaches a steady state is interrupted.

After the drying operation is completed, the operation shifts to cold air operation, and the post-mortem ore and exhaust #1
When the temperature drops below 40℃, the third relay contact opens, stops the motor (3), and ends the cold air operation.
! Open the J-ray contact to release the self-holding of the power supply.

In this embodiment, the drying rate adjustment timer is activated when the temperature difference between the intake and exhaust reaches (A+5)t, so that an arbitrary Km rate can be obtained, which is convenient for ironing. , when there is no need to adjust the drying rate (A+5
) It is also possible to switch to cold air operation when the temperature is reached. Also, since the operation is controlled by the difference between the intake air temperature ff1 degree and the exhaust air temperature #A degree, accurate control can be achieved even if the intake air temperature fluctuates during operation, but since the intake air temperature usually does not fluctuate that much, only the exhaust temperature The operation may be controlled based on the measured value.

As described above, the present invention stores the temperature or difference in temperature in a microcomputer when the exhaust temperature reaches a substantially constant level, or when the difference between the intake air temperature and the exhaust air temperature reaches a substantially constant level. Since the drying operation is ended when the temperature reaches a predetermined value or higher, or after a predetermined period of time has elapsed since the memorized value, the temperature at the end of the drying operation is set from the beginning of the operation. Compared to machines where the total operating time from the beginning of operation is set using a timer, it is possible to obtain the desired drying rate without being affected by the amount of laundry, type of fiber, or dehydration rate. I can do it.

[Brief explanation of the drawing]

Fig. 1 is an information transmission circuit diagram for the microcomputer of the clothes dryer of the present invention, Fig. 2 is a variation curve of the gjL exhaust temperature difference, and Fig. 5 is a flowchart. M degree detection thermistor %uJ(L9(
To) Town...Voltage comparator, (2)...Ladder circuit, (171
・Old...variable resistor. Figure 3 (a)

Claims (1)

[Scope of Claims] (ll. After the start of operation, when the difference between the intake air temperature and the exhaust gas temperature or the exhaust temperature itself reaches a substantially constant value, the temperature difference or temperature [is detected and stored in the microcomputer, and the stored value is The clothes dryer is characterized in that the drying operation is ended after the humidity reaches a predetermined value or higher and the drying operation is extended by the time set by the drying rate adjustment tie i after death. (2) The intake air temperature and the exhaust air temperature The time required for the difference in temperature or the exhaust temperature itself to reach a substantially constant value is determined in advance through experiments and stored in a microcomputer.
The clothes dryer according to Item S of Item S, characterized in that the clothes dryer is configured to detect the difference between the intake air temperature and exhaust air temperature or the exhaust air temperature itself when the storage time is reached and the exhaust air temperature itself is running. (3) The drying rate control timer has a built-in variable resistor, and the partial voltage of the variable resistor and the voltage generated from the ladder circuit are connected to a voltage comparator, and the output from this voltage comparator is By inputting lI#! into the microcomputer, this microcomputer determines the time to be extended. A clothes dryer according to claim 8, characterized in that the clothes dryer is configured to: (4) In Clause 2 of the Claims, when the clothing input door is opened before the time in the trench reaches a certain value, the storage time is extended according to the time the door is opened. A clothes dryer characterized by: