JPS63260598A - Clogging display unit for 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 (a) Industrial Application Field The present invention heat-exchanges exhaust gas discharged from a rotating drum through a filter to remove moisture, and then changes the exhaust gas to have positive resistance temperature characteristics. The present invention relates to a clogging indicator in a clothes dryer which is reheated by a honeycomb-shaped heater and then supplied to the rotating drum.

(b) Prior art An example of a control device for this type of clothes dryer is
It is disclosed in Japanese Patent No. 6839. This device detects the exhaust gas temperature before and after heat exchange, and uses the temperature difference to control the drying operation, and uses a filter to remove lint generated during drying from the drum exhaust. but,
If the filter becomes clogged or the heater itself becomes clogged, the circulation rate decreases, and the heater input decreases, the temperature difference increases and the drying operation continues for a long time, resulting in so-called over-drying. become a state.

(C) Problems to be Solved by the Invention The present invention detects filter clogging and heater clogging and displays them separately, while activating a buzzer when the door is opened during the display, thereby providing both visual and auditory information. The system accurately informs the user of clogging, prevents overdrying, and simplifies post-work.

(d) Means for Solving the Problem The solution according to the present invention includes a first heat-sensitive means for measuring the temperature of the exhaust gas discharged from the rotating drum through the filter, and a first heat-sensitive means for measuring the temperature of the exhaust gas discharged from the rotating drum through the filter, and a second heat sensitive means for measuring the temperature or the temperature after heat exchange of the cooling air for heat exchange; and a storage section for storing the difference in temperature measured by the first and second heat sensitive means after a predetermined time from the start of operation as a reference value. and a drying operation control means that allows the heating drying operation to end when the measured temperature difference reaches a predetermined value or more than the reference value, and a drying operation control means that allows the heating drying operation to be terminated when the measured temperature difference reaches a predetermined value or more than the reference value; Detects that the difference in the measured temperature between the third heat sensitive means and the first heat sensitive means or the second heat sensitive means exceeds the upper or lower limit of the predetermined temperature J& range. a display control unit that operates one of the indicators based on the detected force that the upper limit has been exceeded, and operates the other indicator based on the detected force that the lower limit has been exceeded;
This configuration includes a buzzer control unit that operates a buzzer when the door is opened while any of the indicators is in operation.

(e) Effect The temperatures detected by the first, second, and third heat sensitive means have the characteristics shown in FIG. 4 during normal conditions when the filter and heater are not clogged, and Or a second sense! The measurement temperature difference with the first method is 70 degrees, 8
It is in a substantially constant range around 0deg.

However, if the filter becomes clogged, the heated air to the rotating drum becomes congested and concentrates on the third heat-sensitive means, and as shown in Fig. 5, the measured temperature difference exceeds the upper limit of a certain range. If only the heater becomes clogged with fine lint that has passed through the filter, the third heat-sensitive means will be cooled by the air outside the circulation path from the communication port, and the measured temperature difference will fall below the lower limit of a certain range, as shown in Figure 6. I will overcome it.

Furthermore, if the heater and filter become clogged, characteristics similar to those of a clogged filter will be obtained, as shown in FIG.

Therefore, if it is detected that the measured temperature difference between the third heat sensitive means and the first or second heat sensitive means exceeds a certain range above or below, filter clogging or heater clogging can be detected.
In addition to distinguishing this and displaying it with a display, if the screen is opened without noticing the display, a buzzer will be activated to alert the user to the display, informing the user of the clog both visually and aurally, and ensuring that the work is done afterwards. Close.

(f) Embodiment To explain based on FIGS. 1 and 2, (1) is a metal machine frame of a clothes dryer, and the entire front plate (2
) and the rear plate made of gold M (3) are fixed. (4) is the clothing entrance/exit formed on the front panel (2), and (5) is the i
The door that opens and closes the entrance (6) is a metal annular drum support plate (7) located at the front of the machine frame (1) and fixed to the machine frame (1) and the front plate (2). ) is a metal partition plate placed at the rear of the machine frame (1).Here, the partition plate (
7) are installed and fixed on both sides of the machine frame (1), and have a plurality of vent holes (8) radially extending from the center.

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

(10) is a resin molded drum that serves as a drying chamber, and the entire opening edge is attached to the outer peripheral edge of the drum support plate (6) with felt (
) and are rotatably fitted. In addition, this drum (10) has a bearing fixed to the center of the rear surface, which is connected to the support shaft (
9) is rotatably inserted into the front end and prevented from being removed with a bolt and washer. Furthermore, this drum (10) has a hot air outlet (12) formed on its rear surface consisting of a number of through holes or radial slits.

(13) connects the hot air inlet (14) formed in the lower row (Jlll) of the drum support plate (6) to the vent hole (7) of the partition plate (7).
The L-shaped duct (15) fixed to the drum support plate (6) and the rear surface of the partition plate (7) are airtightly covered and stopped. cylindrical circulation casing (16). The duct (15) has a honeycomb-shaped heater (17) having positive resistance temperature characteristics.
A communication port (18) is provided at the top near the hot air inlet (14) to communicate the circulation path (13) with the inside of the machine frame (1), and a drain hole protruding outside the machine is provided at the bottom. (19) is installed vertically. The circulation casing (16) integrally forms a downward circulation pipe (20), which is connected and communicated with the duct (15) at the inner bottom of the machine frame (1).

(21) is a cooling casing of almost the same shape that is fastened to the rear side of the circulation casing (16), and integrally forms a cooling path (22) that is partitioned with the circulation pipe (20). , which communicates with the cold air outlet (23) on the bottom of the machine frame (1). The rear plate (3) covers the rear part of the cooling casing (21) and the cooling passage (22).

(24) is a heat exchange type double-sided fan disposed across the circulation casing (16) and the cooling casing (21), and is rotatably supported at the rear of the support shaft (9) via metal. ing. <25025) is a rotation transmission boob connected to this funk 24).

(26) is a motor installed at the inner bottom of the machine frame (1),
Pulley (27) including A/F driver pulley and belt (2)
8) rotates the drum (10) at low speed,
The fan (24) is rotated at high speed via pulleys (25) (25) and a belt (28).

29) is a sealing material that seals between the hot air outlet (12)... and the vent (8), and 30)... is a sealing material that seals between the hot air outlet (12)... and the vent (8).
) is a cold air inlet drilled radially in the central bulge of 6.
(31) is a filter device detachably attached from the inside so as to cover the hot air outlet (12) on the rear surface of the drum (11).

And (32), (33), and (34) are the first, fJj2,
These are first, second, and third thermistors serving as third heat-sensitive means. 2
The thermistor (33) is located in the duct (15) and measures the exhaust temperature after heat exchange and dehumidification and before reheating, and the third thermistor (30) is located in the communication port (18) in the duct (15) and The exhaust temperature after reheating is assumed to be located near the population <14)... Furthermore, this second thermistor (33)
The double-sided fan (24) may be used to detect the outside air temperature after heat exchange, or if a dehumidifier is separately provided, the temperature of the cooling outside air after passing through the dehumidifier may be detected.

Next, explaining the control circuit, (35) is a start switch, (36) is a first door switch, and (37) is a direct current converting circuit. (38) is a waveform shaping circuit that converts a commercial frequency AC voltage into a rectangular wave pulse and applies it to a micro combinator (hereinafter referred to as "maifun") (39), which is used for time counting. <40) is a clock oscillation circuit that advances the program in the microcomputer (39).

(41) is an initial reset circuit that sets the program in the microcomputer (39) to its initial state when the power is turned on. (42), (43), and (44) are voltage comparator circuits in which the electrical values of the first, second, and third thermistors (32), (33, and 34) are divided by resistors and inputted, and the other input An output signal from a ladder circuit (45) that generates a staircase wave in response to an output from a microcomputer (39) is input to one terminal. Here, the ladder circuit (45) is the microcomputer (3).
It is fully connected to the output terminals (a) to (g) of 9), and changes the ladder output in a stepwise manner as signals are sequentially output from each output terminal. The microcomputer (39) is a voltage comparison circuit (
42) When (43>(44)) becomes conductive and input, the microcontroller (39) itself judges which of the output terminals (a) to (g) the signal is coming from, and outputs the signal from each output terminal. It is supposed to know the temperature.

(46) is a second Ji switch for determining whether the door (5) is closed or not, (47) is a variable resistor for adjusting the drying rate, (48) is a stop switch, and <49) is a microcontroller (
The output signal from 39) turns on the motor (26).
The triac (50') is the microcomputer (39
) is activated by the output signal from the self-holding relay (5
0) contact, (51') is the contact of the control relay (51) that is activated by the output signal from the microcomputer (39), (5
2) is an LED for indicating the operating status, (53) is an LED for indicating a clogged filter, (54) is an LED for indicating a clogged heater, and 55 is a buzzer for notifying the end of operation or an abnormality. be.

Thus, the motor (26) and heater (
17) to rotate the fan (24) and drum (10). Then, the drying air heated by the heater 17) flows through the hot air inlet (14) - drum (lO) - filter device (31) - hot air outlet (12> - vent (8) - fan (24) - circulation casing ( 16) - Circulation pipe (20)
- Goku I - (15) - Heater (17) is circulated in this order to dry the clothes in the drum (10). On the other hand, the outside air is connected to the cold air inlet (30) - cooling casing (21) - fan (24)
- Cooling path (22) - Cold air outlet (23) flows in this order.

Then, heat exchange is performed between the front and rear surfaces of the fan (24),
The drying air discharges moisture from the clothes in the duct (15) and is discharged as drain from the drain hole (19), and the air itself is circulated with its humidity reduced. Further, most of the thread layer etc. coming out of the clothing can be removed by the filter device (31).

Next, the control operation of the microcomputer (39) during operation is
The explanation will be based on the floats in the figure. First, when the start switch (35) is operated, the microcomputer (39) is reset and self-maintained.Then, the microcomputer (39) is reset and self-maintained.
39) is RAM (Random Access Memory) (56)
or a separate driving time counter (57
) and startup time counter (5g> (can also be used as the operating time counter)), and record the contents of the operating time counter (57) in the ROM (read only memory) (59). 15 minutes, 180
It is determined by the minute and time control section (6o), and the contents of the startup time counter (58) are also memorized for 10 seconds (this time can be changed and set appropriately in advance) and the time control section (6o).
0). In addition, the microcomputer (39) starts temperature measurement by each thermistor (32), (33), and (34), stores the measured value in the RAM (56), and
The digitized value of the variable resistor (47) is stored in the RAM (5
G) and set a start flag in RAM (56).

The motor control unit (61) of the microcomputer (39) controls the triac (49) of the motor (26) by 0.2 seconds during the 10 seconds that the startup time counter (58) is counting.
A signal of N-0, OFF for 1 second is output, and the motor (26) is started by phase control so that a drive torque greater than the friction torque is not applied. Therefore, the rotating drum (IOC fan (24), pulley (25) (25>), pulley (27),
Sufficient friction is generated between the belts (28), (28), etc., and slippage is reduced. When this starting time has elapsed and the rotating drum (10) reaches a certain number of rotations, a continuous ON signal is output to the triac (49) of the motor (2G).

When the LED (53) or the LED (54) turns off and the stroke control unit (62) determines that the cold air operation command is not issued, the heater (17) is turned on by the heater control unit (63) to perform drying operation. . That is, the motor control section (61)
The heater control section (63) constitutes a drying operation control means.

After the start of operation, the microcomputer (39) calculates the difference (C) between the temperature measured by the third thermistor (34) and the temperature measured by the second thermistor (33) using the calculation unit (64), and calculates this temperature difference (
C) and a plurality of reference temperature Jti differences are compared and detected by the abnormality detection section (65). This reference temperature difference is ROM (59)
120deg, 110deg, 90deg stored in advance
deg, 60deg, and 40deg, which are used as reference inputs in that order. Such a detection part (65) is 120 degrees
When a temperature difference between the above and 39 degrees or less is detected, the heater control unit (63) turns off the heater (17) and changes to cold air operation, and lights up (blinks) the LEDs (53) and (54). (53) (54) are lit (flashing)
The stop switch (48) indicates an abnormality.
) etc., the display operation can be read unless the power is cut off.

The microcomputer (39) is controlled by the display control section (72).
When the temperature is above 39 degrees, the LED (53) lights up (blinks), and when the temperature is below 39 degrees, the LED (54) lights up (blinks).
A clogged filter (or even a clogged heater) is displayed at D (53), and a clogged heater is displayed at an LED (54) to facilitate subsequent repair work.

A clogged fill letter or a clogged heater may be caused by a temperature difference (
The fact that the determination can be made by detecting C) becomes clear from the simplified configuration diagrams shown in FIGS. 8(a) and 8(b). That is, when the filter unit R (31) becomes clogged, the internal pressure of the rotating drum (10) increases, and as shown in FIG. (1) When the third thermistor (34) has been heated by a portion of the reheated exhaust gas, it is now heated by the majority of the reheated exhaust gas, raising the measured temperature.

Therefore, a temperature difference of 12 Odeg or more is created.

In addition, if the heater (17) becomes clogged with fine threads M that have passed through the filter device (31), the hot air inlet (1
4) The pressure in the vicinity decreases, and air in the machine frame (1) conversely enters from the communication port (18), etc., as shown by No. 8'rA (b). Then, the third thermistor (34), which had been heated by a part of the reheated exhaust gas until now, is now cooled by the outside air and lowers the measured temperature. follow τ
, resulting in a one-quality difference of 39 degrees or less.

Furthermore, in case the filter device (31) and heater (17)
If both of the heaters (17) become clogged, either of the conditions shown in Figure 8 (a) and (b) will occur depending on the magnitude of the ventilation resistance in each, but generally the heater (17) is clogged after 1000 hours or more. Since it only comes into being through use, the 8th
The state is often rA(A).

In this way, even when the heater (17) is clogged to some extent, the communication port (18) is located at the top of the duct (15) and the hot air inlet (
14) Because it is located near..., the reheated exhaust gas tends to rise due to natural convection, making it possible for the third Nami 2 (34) to measure high temperatures even if the overall circulating air volume decreases. There is. Also, for that purpose, as shown in Figure 9,
The third thermistor is connected to the communication port (18) at the top of the duct.
34) can be placed immediately below and stopped by the hand (66).

Normally, the abnormality detection unit (65) detects a temperature difference (C)
It is detected within a predetermined range from the upper limit of 89 deg to the lower limit of 60 deg, and in this normal state, the setting unit (67) stores 15 deg as the predetermined value (B) in the RAM (56).

When the temperature difference (C) detected by the detection unit (65) exceeds the lower limit of the predetermined range in the range up to 40 deg due to a slight clogging, or exceeds the upper limit of the predetermined range in the range up to 1109 deg, the microcomputer (39) Predetermined value correction section (
68) subtracts 2 degrees from the predetermined value (B) or changes 15 degrees to 13 degrees. Further, the predetermined value correction section (6B) has a detected temperature difference (C) of 110
When detecting from deg to 119deg, 2 more
Subtract only deg or directly from 13deg
Change to eg.

And then, 15 minutes passed from the start of the drive! - Then, calculation W (64) calculates the difference (A) between the temperature measured by the first nermisk (32) and the temperature measured by the second thermistor (33), and converts that value to the reference value in 15 minutes. (As) as R
A M (56). From then on, until the total operating time reaches 180 minutes, the temperature difference (A) will be (
The dryness detection unit (69) determines whether the standard value (As) exceeds a predetermined value (B).
When it is too late, the heater control unit (63) controls the heater (1).
7) is turned off to end the drying operation, and the process control section (62
) to shift to cold air operation.

For cold air operation, the motor (26) is controlled by the motor control unit (61).
) only! It is driven by a-axle, and has a cold air counter (
70), 5 minutes can be measured. After this time has elapsed, the motor (26) is stopped, and the buzzer (55) for notifying the end is operated for a certain period of time by the buzzer control section (71) to complete the entire operation.

After the start of operation, the LED (53) was closed due to clogging during operation.
Alternatively, if (54) is lit (blinking), the system immediately shifts to cold air operation (5 minutes), and when the door (5) is opened during this cold air operation or after the cold air operation ends, the motor (26) is turned off. Stop and stop the appropriate display indicating that it is in cold air operation. When the door (5) is opened either during the operation or after the operation has ended, the buzzer I (ss) for notifying an abnormality is activated for only 5 seconds and the entire operation is completed.

That is, if the door is opened while an abnormality is being displayed, a buzzer (55) will also notify the user of the abnormality, clearly informing the user of the clogging. Also, an error message appears after the cold air operation ends!
If i(5) is not opened, the display will continue until this time.Furthermore, after opening the door, remove the filter, etc., and -C will also turn on the LED.
The displays (53) and (54) will continue unless the power source is shut off once using the stop switch (48) or the like.

(G) Effects of the Invention According to the present invention, when the door is opened while the clogging is being displayed, the buzzer is activated immediately when the user is located near the dryer, and the clogging is detected both visually and audibly. Since it is immediately clear that the buzzer operation is different from the end buzzer, the clogging display can be easily noticed. Therefore, it is possible to provide an apparatus that can promptly and differentiatedly deal with clogging of the C1 filter or heater, and makes the work after clogging easier.

[Brief explanation of the drawing]

Fig. 1 is a control circuit diagram of the device of the present invention, Fig. 2 is a side sectional view of the clothes dryer according to the invention, Fig. 3 is a flowchart for explaining the operation, and Fig. 4 is a normal time-temperature diagram. Characteristic diagram, Figure 5 is a time-temperature characteristic diagram when the filter is clogged, Figure 6
The figure is a time-temperature characteristic diagram when the heater is clogged, Figure 7 is a time-temperature characteristic diagram when the filter and heater are clogged, and Figure 8 is a time-temperature characteristic diagram when the heater is clogged.
Figures (A) and (B) are simplified configuration diagrams when the filter is clogged and when the heater is clogged, and Figure 9 is an enlarged sectional view of the main parts. (10)...Rotating drum, (17)... heater,(
24)...Fan, (31)...Filter device,
<32) (33) (34)...First, second, and third thermistors, <39>...Microcomputer, (53)...LED for indicating filter clogging, (54)... LED for indicating heater clogging, (61)...Motor control unit, (63)...Heater control unit, (65)...
Abnormality detection section, (68>...predetermined value correction section, (71)
...Buzzer control section.

Claims (1)

[Claims] (1) A door is installed at the clothing entrance and exit, and the exhaust gas discharged from the rotating drum through a filter is heat-exchanged to remove moisture.
In a clothes dryer in which the exhaust air is reheated by a honeycomb-shaped heater with positive resistance temperature characteristics and circulated to the rotating drum, the temperature of the exhaust gas discharged from the rotating drum through the filter is measured. a first heat-sensitive means for measuring the temperature of the exhaust gas before reheating after heat exchange or a temperature of cooling air for heat exchange after heat exchange; a storage unit that stores the difference in temperature measured by the second heat-sensitive means as a reference value; a drying operation control unit that ends the heating drying operation when the measured temperature difference reaches a predetermined value or more than the reference value; A third heat sensitive means that measures the temperature of the exhaust gas after being reheated by the heater in the vicinity of the communication port with the outside of the circulation path, and a difference in the measured temperature between the third heat sensitive means and the first heat sensitive means or the second heat sensitive means. a detection unit that detects that the temperature has exceeded the upper or lower limit of a predetermined temperature range, and operates one of the indicators based on the detection force that the upper limit has been exceeded, and the detection unit that operates the one indicator based on the detection force that the lower limit has been exceeded. A clogged clothes dryer indicator comprising a display control unit that operates the other indicator, and a buzzer control unit that operates a buzzer when the door is opened while either indicator is operating. Device.