JPS5913675B2 - Dryer filter clogging alarm device - Google Patents

Description

Detailed Description of the Invention The present invention allows hot air heated by a plurality of self-heating heaters having positive temperature characteristics to flow into a drying object storage by rotating a fan, and exchanging heat with the drying object. This invention relates to a filter clogging alarm device for a dryer that controls the input wattage of the heater by controlling the airflow that passes through the self-heating heater. without being influenced,
The purpose of this is to enable accurate filter clogging notification to be performed at all times.

Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings.

In FIG. 1, 1 is a cabinet for a clothes dryer which has an open air intake 2 at the lower front and a hot air outlet 3 at the upper rear; 4 has a drying material inlet 5 at the center of the front; It is a drying material storage (hereinafter referred to as a drum) which has a large number of hot air suction holes 6 circumferentially on the front side, and a filter mounting part 1 on the rear side.
has been established.

Reference numeral 8 denotes a large number of hot air exhaust holes provided circumferentially in the filter mounting portion 1.

A plurality of baffles 9 are fixed to the inner wall of the drum 4 to promote transfer of the material to be dried.

Reference numeral 10 denotes a suction wind tunnel that guides external air sucked in from the open air intake port 2 into the drum 4. Inside this suction wind tunnel 10, a plurality of self-heating heaters 11 having positive temperature characteristics are provided.

Reference numeral 12 denotes a filter storage device in which a filter 13 made of a breathable material such as sponge is attached, and a plurality of slit-shaped intake ports 14 are provided on the front surface of the filter storage device 12. ing.

Reference numeral 15 denotes a fan, which causes the hot air heated by the self-heating heater 11 to flow into the drum 4, exchange heat with the material to be dried, and exhaust the air through a filter.

Reference numeral 16 denotes an exhaust wind tunnel, and one end of this exhaust wind tunnel 16 is attached with a drum bearing 1B that supports the drum rotating shaft IT, and the opening at the other end communicates with a hot air exhaust port 3 provided at the upper rear surface of the false casing 1. There is.

Reference numeral 19 denotes a filter storage device which is equipped with a filter 20 in an appropriate manner, and the front surface of this filter storage device 19 is provided with a plurality of filter hot air intake holes 21, and the filter storage device 19 is detachably attached to the filter mounting portion T of the drum 4. Installed.

22 is a motor, and a drum rotation pulley 24 and a fan rotation pulley 25 are fixed to both ends of a motor shaft 23.

Further, the rotation of the motor 22 is transmitted to the drum 4 via the drum belt 26, and is also transmitted to the fan 15 via the fan belt 2T and fan pulley 28.

Reference numeral 29 denotes a sliding receiver, and the rotation transmitted from the motor 22 via the drum rotation pulley 24 and drum belt 26 is smoothly transmitted to the drum 4 by the sliding receiver 29 and the bearing 18.

30 is a door for opening and closing the drying material inlet 5, and 31 is an installation leg.

Reference numeral 32 denotes an air volume adjustment knob provided at the front upper part of the outer casing 1, which rotates.

A rod 33 has the function of converting the rotational movement of the air volume adjustment knob 32 into a reciprocating movement by an appropriate method.

34 is a movable plate provided in the exhaust air tunnel 16, and this movable plate 34 operates in conjunction with the rod 32 around a fulcrum 35 to adjust the exhaust air volume.

Fig. 2 shows an embodiment of the filter clogging alarm circuit, in which 36 is a power supply switching contact, 31 is a heater switching contact, and together with the power supply switching contact 36, each is built into a timer (not shown). has been done.

Reference numeral 22 denotes a motor provided via a power supply switching contact 36, and reference numeral 11 indicates four self-heating heaters (hereinafter referred to as self-heating heaters) having positive temperature characteristics provided via heater switching contacts 3T.

A current transformer 3B detects the current flowing through the self-heating heater 11, and the voltage detected by the current transformer 3B is smoothed by a diode 39 and a capacitor 40.

41 and 42 are resistors that divide the smoothed voltage, 43 is a resistor connected to the collector of the transistor 44, and 45 is a resistor connected between the emitters of the transistors 44 and 46.

41 is a diode that converts the voltage obtained through the heater switching contact 31 into direct current; the voltage is stepped down by a resistor 4B, and smoothed by a capacitor 49;
The voltage is maintained at a constant voltage by a resistor 50 and a Zener diode 51, and further divided by a resistor 52 and one of resistors 53, 54, and 55.

Reference numeral 56 denotes a reference potential switching contact for selecting one of the resistors 53, 54, and 55, and this reference potential switching contact 56 is configured to work in conjunction with the air volume adjustment knob 33.

5γ is a clogging indicator meter, and this clogging indicator meter 51 is connected in series with a resistor 58 and also connected to the collector of the transistor 46.

In addition, the resistors 42.43, 45.52 and the resistors 53, 54
．． 55 and transistors 44, 46 form a differential amplifier, resistors 53, 54, 55 determine the operating reference potential of transistor 46, and normally the potential of resistor 42 is set to resistor 53, 54, . If the potential is set higher than the potential of transistor 55, transistor 44 is activated and
6 is in the off state.

In this state, when the voltage obtained from the current transformer 3B becomes low, the potential across the resistor 42 becomes low, and when this potential becomes lower than the reference potential of the resistors 53, 54, 55, the transistor 44 is turned off and the transistor 46
is activated, and current flows through the clogging indicator meter 5T to notify the clogging state.

It is also possible to replace the clogging indicator meter 5T with a buzzer and notify of clogging with a buzzer.

Furthermore, the relationship between the resistors 53 and 54.55 is such that the resistance value is 53.
>54>55, and the reference potential switching contact 56 is in contact with the resistor 53 when using the rated wattage, and is interlocked with the air volume adjustment knob 32 so as to be in contact with the resistor 55 when using the minimum wattage.

Next, the drying operation of the object to be dried will be explained.

First, clothes are put into the drum 4 from the drying material input port 5,
When a timer (not shown) is set, the power supply opening/closing contact 36 and the heater opening/closing contact 3T are turned on, and the motor 22, self-heating heater 11, and clogging alarm circuit are energized.

Then, by energizing the motor 22, the drum rotating pulley 2
The rotation is transmitted to the drum 4 via the drum belt 26 and the drum belt 26, and the baffle 9 starts transferring the clothes.

On the other hand, the rotation of the motor 22 is also transmitted to the fan 15 via the fan rotation pulley 25, the fan belt 2T, and the fan pulley 28, so that the fan 15 rotates.

As the fan 15 rotates, external air is sucked in through the slit-shaped intake port 14 provided on the front surface of the filter housing 12.

The drawn air in the row passes through a filter 13 and an intake air tunnel 10, and is heated by a self-heating heater 11.

This heated hot air is guided into the drum 4 through a large number of hot air suction holes 6 provided circumferentially on the front surface of the drum 4.

The heated air introduced into the drum 4 absorbs moisture from the clothes while passing through the clothes, thereby performing a drying action.

After completing this drying action, the hot air containing moisture is transferred to filter hot air intake holes 21 provided in a plurality of filter housings 19.
It passes through the filter 20, and then through the hot air exhaust holes 8 provided circumferentially in the rear of the drum 4, through the exhaust air tunnel 16, and then through the hot air exhaust port 3 provided above the rear surface of the cabinet 1. It is then discharged to the dryer.

Clothes are dried by continuously performing such actions.

When the timer approaches the OFF state, the heater opening/closing contact 3γ is turned OFF, and the supply of electricity to the self-heating heater 11 is stopped.

Operation continues in this state until the timer turns off.

In this case, cold air is sucked into the drum 4 to cool the clothes and prevent wrinkles from forming.

After this cold air process has been carried out for several minutes, the power switch 36 is turned off, and the motor 22 is stopped, thereby completely completing the drying process.

Lint generated from the clothes during the drying process is collected by a filter 20 provided in the drum 4, and dust such as lint contained in the outside air is collected by a filter 13 provided in the outside air intake port 2. Ru.

In the above configuration, when the reference potential switching contact 56 is brought into contact with the resistor 53 and the heater is used at its rated value, the potential of the resistor 42 is reduced when the filter 20 provided in the drum 4 and the filter 13 provided in the outside air intake port 2 are not clogged. is resistance 5
3, the transistor 46 is turned off and the clogging indicator meter 5γ does not operate.

When the dryer is used repeatedly several dozen times, each filter 13, 20 gradually becomes clogged, and as the exhaust air volume decreases, the air volume passing through the self-heating heater 11 also decreases, and the temperature of the heater 11 decreases due to clogging. It rises more than when it is not doing so, and the resistance increases.

As a result, the current flowing through the self-heating heater 11 decreases, so the voltage detected by the current transformer 38 decreases, and the potential applied to the resistor 42 also decreases.

When the potential of this resistor 42 becomes lower than the reference potential of the resistor 53 at the rated heater capacity, the transistor 46 is turned on and energizes the clogging indicator meter 5T to notify the clogging.

If the exhaust air volume at the current rated heater capacity is set to A, and the movable plate 35 is adjusted using the air volume adjustment knob 32 to change the exhaust air volume to B and C to control the input wattage of the heater, the input wattage of the heater may be controlled due to clogging of various filters. When the air volume to be notified is A, X
, when B is Y, and when C is Z.

Converting this into a current change, the current changes from A' to X'
, B' to Y', and C' to Z', the clogging is notified, but at the rated heater capacity, X
(7) Even if it is possible to make a notification when the current is reached, when the air volume is adjusted, for example, when the air volume is 8 o'clock, even if there is no clogging, the current B' is smaller than X', so the notification is made.

Also, if the minimum usage watt hour, that is, the clogging alarm current Z'II at the exhaust air volume of C, is set to notify the clog, when used at the air volume of A or H, the clogging will occur considerably. Otherwise, it will not be possible to report.

However, according to the present invention, a plurality of resistors each having a different resistance value are provided to constitute the differential amplifier, and the plurality of resistors are switched in conjunction with the air volume adjustment.
If the air volume changes due to air volume adjustment, the reference potential will also change in conjunction with it. Therefore, accurate clogging notification must be performed at all times without being affected by the control of heater input wattage due to air volume adjustment. I can do it.

[Brief explanation of drawings]

Fig. 1 is a side sectional view of a clothes dryer that employs the filter clogging alarm device of the present invention, Fig. 2 is a circuit diagram of the clogging alarm device, and Fig. 3 shows the relationship between exhaust air volume and heater current change. This is a graph showing. 4... Storage for items to be dried, 11... Self-generating heater, 15... Fan, 13.20...
...filter, 53.54.55...resistance.

Claims (1)

[Claims] 1. By the rotation of the fan, hot air heated by a plurality of self-heating heaters having positive temperature characteristics flows into the drying material storage, exchanges heat with the drying material, and exhausts the air, and then the self-heating heater In a dryer that controls the input wattage of the heater by adjusting the amount of air passing through the self-heating heater, the current change in the heater due to the change in the amount of air passing through the self-heating heater is detected to prevent clogging of the filter provided in the air circulation path. A dryer characterized in that a clogging alarm circuit is provided to notify the user of clogging, a plurality of resistors each having a different resistance value are provided constituting a differential amplifier, and the plurality of resistors are switched in conjunction with the air volume adjustment. Filter clogging alarm device.