KR0120396Y1 - Filter sensor for dryer - Google Patents

Abstract

The present invention improves the reliability of the device by accurately detecting the filter clogging of the forced hot air type laundry dryer to inform the consumer.

To this end, the present invention is the hinge lever coupled to the bracket (2) fixed to the main body (1) and the detection lever (4) which is displaced according to the change in the flow rate and flow rate of the hot air flowing in the hot air duct (3), and the bracket It is fixed to (2) is a filter clogging detection device of the forced hot air type laundry dryer consisting of a sensing means for sending a signal indicating whether the filter 7 is clogged on or off in accordance with the displacement amount of the detection lever (4) to the display.

Description

Filter Clogging Detection Device of Forced Hot Air Clothes Dryer

1 is a longitudinal sectional view showing a conventional forced hot air type laundry dryer

2 is a graph showing a correlation between temperature, current value, and electrical resistance according to a conventional filter clogging indirect sensing method.

3 is a flow chart showing a conventional filter clogging indirect detection sequence

4 is a longitudinal sectional view showing a forced hot air type laundry dryer to which the present invention is applied

5 is an enlarged detailed view of a part A of FIG.

6 is a flow chart showing the operation sequence of the present invention

* Explanation of symbols for main parts of the drawings

1: body 2: bracket

3: hot air duct 4: sensing lever

5: operation lever 6: micro switch

7: filter

The present invention relates to a filter clogging detection device of a forced hot air type laundry dryer, and more particularly, it is possible to accurately detect when the filter of the forced hot air type laundry dryer is clogged to inform the cleaning time of the filter.

In general, the forced hot air laundry dryer is a convenient device that can dry the laundry by forcibly circulating the hot air heated by the heater and the fan into the drum containing the wet laundry in a short time.

To this end, the conventional forced hot air type laundry dryer is provided with a door 14 at the center of the front surface of the main body 1, and a hot air inlet hole 15 behind the door 14 in the main body 1, as shown in FIG. Drum support member 16 is fixed to the drum support member 16, the drum support member 16 is rotated and the laundry is put in the rear of the drum support member 16 with a sealing gasket 17 therebetween. ) Is installed.

In addition, a hot air outlet hole 18 is formed at the rear center of the drum 10, and a filter 7 for filtering foreign matter is detachably mounted in front of the hot air outlet hole 18.

Then, the fan driven pulley 19 and the fan 11 are rotatably fixed to the same axis passing through the filter 7 in the rear center of the main body 1, and the fan having the gasket 20 attached to both ends thereof ( 11) The outer circumferential surface is in contact with the gasket 20 to surround the fan 11 while being connected to the drum support member 16 formed with the hot air inlet hole 15 on the front surface of the drum 10 to form a hot air duct (3a) The case 21 is installed, the hot air coming out of the drum 10 through the filter 7 in contact with the rear surface of the rotating drum 10 at the center of the fan case 21 by the fan case 21. A sealing member 22 is installed to prevent the formed hot air duct 3a from escaping.

In addition, an air inlet hole 23 is formed in the center of the rear surface of the main body 1, and an air outlet hole 24 through which the air introduced into the air inlet hole 23 escapes on the lower part of the main body 1. Is formed, the lower one side of the main body (1) due to the temperature difference between the hot air escaped from the drum 10 and the cold air introduced from the outside of the hot air duct to discharge the condensed water droplets from the front of the fan (11) 3a) The rear shaft duct 13 formed at one side of the lower portion is installed through the main body 1.

Meanwhile, the motor 9 supported by the motor support member 25 is fixed to the inside of the main body 1, and the drum pulley 27 and the fan drive pulley 28 are connected to the drive shaft 26 connected to the motor 9. Are respectively installed.

Therefore, when the wet laundry is dried, the user opens the door 14 installed on the front of the main body 1, puts the laundry into the drum 10, and applies power, and then the motor 9 is driven to the driving force. The drum pulley 27 and the fan drive pulley 28 coupled to the drive shaft 26 are rotated at the same time.

At this time, since the drum belt 29 is connected between the drum pulley 27 and the drum 10, the drum 10 is supported by the drum support member 16 and the drum pulley 27 to rotate, and the fan driving pulley ( A fan belt 30 is connected between the fan driven pulley 19 and the fan driven pulley 19 to rotate the fan 11 fixed to the same rotation shaft as the fan driven pulley 19.

That is, when the fan 11 rotates, suction force is generated, and external cold wind flows into the inner space of the main body 1 behind the fan 11 through the air inlet hole 23 formed in the rear center of the main body 1. After the main body 1, the circulating action exiting to the lower air outlet hole 24 is repeated, while in the front of the fan 11, the air introduced into the hot air duct 3a in accordance with the rotation of the fan 11 is a heater (12) flows into the drum 10 in a heated state, absorbs the moisture of the wet laundry, passes through the filter 11 to the front of the fan 11, and then again along the hot air duct 3a. You will repeat the cycle.

At this time, since the hot air escaped to the rear of the drum 10 while drying the laundry in the drum 10 contains a lot of moisture, the hot air from the front of the thin fan 11 and the hot air flowed into the main body 1. Condensation is caused by the difference in temperature between and.

The condensed water droplets flow down to the lower portion and are discharged to the outside through the discharge duct 13 formed at one side of the hot air duct 3a.

Accordingly, the hot air flowing into the drum 10 is reheated by the heater 12 in a state where moisture is removed, thereby absorbing the moisture of the laundry and drying the laundry.

On the other hand, as the drying process proceeds the blows, such as seams attached to the laundry flows with the hot air to escape from the laundry to the rear of the drum 10, the filter 11 mounted on the rear of the drum (10) Filtered out and gathered.

In addition, in the conventional laundry dryer, as shown in FIGS. 2 and 3, when the filter 11 is clogged with a predetermined amount or more in the filter 11 as the laundry is repeatedly performed, the rear of the drum 10 is blocked. As the amount of air flowing out is reduced and this causes the temperature of the heater 12 in front of the hot air inflow hole 15 to rise, which in turn causes an increase in resistance.

In addition, since the current is inversely proportional to the resistance value, a low current value is input to the CT (Current Tronsformer) in the controller (not shown). At this time, the controller compares the reference value flowing through the CT with the input value, and the LED is small when the input value is small. Flashes to indicate filter clogging.

However, the controller detects whether the conventional laundry dryer filter 11 is clogged by comparing the CT input value according to the decrease in the air volume, after converting the air volume decrease to the increase in the heater 12 temperature and resistance. Due to the indirect sensing method that needs to be derived as the change of the current value, the current value was not accurately detected due to the applied voltage and temperature change.

As a result, as the drying proceeds in the state in which the filter 11 is blocked, drying takes a long time, and excessive load is applied to devices such as the motor 9 and the heater 12 to shorten the life of the apparatus. There are many problems.

The present invention is to solve the above-mentioned problems, the filter of the forced hot-air laundry dryer to directly detect the change of the air flow rate and flow rate generated when the filter clogging of the forced hot-air laundry dryer to know the cleaning time of the filter accurately The purpose is to provide a blockage detection device.

The present invention for achieving the above object is a hinge coupled to the bracket fixed to the main body and a sensing lever which is displaced according to the change of the flow rate and flow rate of the hot air flowing in the hot air duct, fixed to the bracket and the displacement amount of the sensing lever It is on or off according to the filter clogging detection device of the forced hot air type laundry dryer consisting of a sensing means for sending a signal to the display unit indicating whether the filter is clogged.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 4 to 6.

4 is a longitudinal sectional view showing a forced hot air type laundry dryer to which the present invention is applied, and FIG. 5 is an enlarged detailed view of part A of FIG. 4, and FIG. 6 is a flowchart showing the operation procedure of the present invention, and the present invention is a The other end of the detection lever 4 inserted in the hot air duct 3 is hingedly coupled to the bracket 2 fixed to the lower part of the main body 1, and hot air is placed on the detection lever 4 upper part of the bracket 2. The micro switch 6 is equipped with an operating lever 5 that interlocks during displacement movement of the sensing lever 4 according to a change in the flow rate and flow rate of the hot wind flowing through the duct 93.

On the other hand, between the one side of the bracket (2) and the detection lever (4) is compressed by the movement of the detection lever 4 subjected to the pressure of the hot air and then the filter 7 is blocked by a foreign material a certain degree or more blocked hot air duct (3) As the amount of air flow and the flow rate of the hot air flowing through the weakening is restored, an elastic member such as a compression spring 8 for restoring the detection lever 4 is installed.

In the present invention configured as described above, as shown in FIGS. 4 to 6, when power is applied to the main body 1 to drive the motor 9, the driving force of the motor 9 is applied to the drum 10 and the fan 11. It is transmitted through the power train.

Accordingly, by the centrifugal force of the rotating fan 11, the air in the duct flows along the hot air duct 3 in the lower part, flows into the drum 10 through the heater 12, and dries the laundry. 7) to pass through the drum (10) rear and then repeat the process of recycling along the duct (3).

At this time, the humid air blown out of the rear of the drum (3) is condensed by the temperature difference with the outside air from the front of the fan (11) becomes a droplet and is discharged out through the exhaust duct (13) on one side of the hot air duct (3) Same as one.

On the other hand, when the laundry proceeds by drying as described above, the sensing lever (4) is inserted into the bracket (2) screwed to the lower part of the main body 1 so that the front end receives the wind pressure flowing through the hot air duct (3) Due to the combination, it is possible to accurately detect whether the filter 7 is blocked, which will be described in more detail as follows.

First, since there is no wind pressure in the hot air duct 3 before the power is applied, the detection lever 4 maintains the state as shown by the virtual line in FIG. 5 by the restoring force of the compression spring 8.

In this state, when the user applies power to dry the laundry, the motor 9 starts to operate. In this case, the micro switch 6 is turned on by the sensing lever 4, so that the main body 1 A lamp indicating that the filter 7 is blocked is lit on the front panel display (not shown).

After that, when the motor 9 rotates at the rated speed after a certain time, the filter 7 is not blocked and in a normal state, the air flows out of the rear of the drum 10 and flows along the hot air duct 3. As a result, the detection lever 4 is rotated counterclockwise while compressing the compression spring 8 as indicated by the solid line in FIG.

Accordingly, the movable end of the operating lever 5, which is an elastic material, also rotates in a counterclockwise direction in conjunction with this to turn off the microswitch 6, thereby indicating that the filter 7 is clogged. The lamp will turn off.

Accordingly, it can be seen that in the normal state in which the filter 7 is not blocked, drying of laundry proceeds in a state where the lamp is turned off.

On the other hand, as a lot of laundry is repeatedly carried out, when foreign matters such as seams and lint are accumulated in the filter 7, and the filter 7 is clogged, the amount of air flowing out of the rear of the drum 10 is reduced as well as the flow rate is reduced. .

Accordingly, when the wind pressure acting on the sensing lever 4 inserted in the hot air duct 3 is weaker than the restoring force of the compression spring 8, the sensing lever 4 is rotated clockwise by the restoring force of the spring and is shown in FIG. It returns to the state as shown by an imaginary line, and in connection with this, the actuating lever 5 also rises as the movable end rotates clockwise about the fixed end, so that the microswitch 6 is turned on. On the front display, a lamp indicating the filter clogging is blinking.

In the above, unlike the lighting state when the power is initially applied, when the filter 7 is blocked, the lamp is repeatedly blinked by the control of the controller, so that the user can accurately know whether the filter 7 is blocked without causing confusion. do.

At this time, the control process of the controller may be configured to immediately stop the drying of the laundry and at the same time the lamp indicating the filter clogging blinks, and may be configured so that the lamp indicating the clogging of the filter (7) flashes while the drying continues. .

In this way, the change in the air flow rate and flow rate due to the clogging of the filter 7 is directly converted into the displacement amount of the detection lever 4, and then the operating lever 5 interlocked with the filter 7 turns the micro switch 6 ON. By blinking to eliminate the detection error and to inform the consumer of the vacuum cleaner of the filter (7) to provide convenience in use, while also bringing the effect of improving the service life and efficiency of the hot-air laundry dryer.

As described above, the present invention is a very useful design to improve the reliability of the device as well as to provide convenience to the consumer by accurately detecting it when the filter (7) of the forced hot air type clothes dryer. .

Claims (3)

A sensing lever that is hinged to a bracket fixed to the main body and is displaced according to a change in the flow rate and flow rate of the hot wind flowing in the hot air duct, and is turned on or off according to the displacement of the sensing lever fixed to the bracket to block the filter. Filter clogging detection device of the forced hot air type laundry dryer, characterized in that consisting of a detection means for sending a signal to the display unit. The apparatus of claim 1, wherein the sensing means is turned on or off by an operating lever installed to interlock with the displacement of the sensing lever. According to claim 1, wherein between the sensing lever and the bracket under the pressure of the hot air is compressed when the sensing lever is rotated in the counterclockwise direction, the filter is clogged and restored when the wind pressure in the hot air duct is lowered to restore the sensing lever Filter clogging detection device of forced hot air type clothes dryer installed.