KR0141778B1 - A clothing dryer - Google Patents

Abstract

The present invention relates to a dehumidifying clothes dryer having a function of controlling the air volume for drying. In the related art, the dehumidification performance of the heat exchange fan is reduced in order to reduce power because the dehumidification performance is largely dependent on the air volume for cooling. Lowering the air volume for drying lowers the power, but the air volume for the cooling air also decreases, resulting in poor dehumidification performance. In addition, since it is difficult to control the linear air volume, there is a problem that the condition time due to the heater on / off may be long by controlling at a predetermined rotational speed (RPM). Therefore, the present invention controls the amount of air flowing into the PTC heater by the damper, but the heat exchange amount to be the same as the conventional to further improve the performance and to shorten the drying time.

Description

Dehumidifying clothes dryer with air volume control

1 is a structural diagram of a conventional clothes dryer.

2 is a circuit diagram of a conventional clothes dryer.

3 is a structural diagram of a dehumidifying clothes dryer having a function of controlling the air volume for drying the present invention.

4 is a circuit diagram of a dehumidifying clothes dryer having an airflow control function for drying the present invention.

FIG. 5 is a structure of the rotation speed detecting book and an output waveform thereof in FIG.

6 and 3, the operation principle of the damper and a detailed view thereof.

7 is a characteristic diagram of the air flow rate and power of the PCT heater.

8 is a characteristic diagram of power and current sensing amount by a sensor.

9 is a characteristic diagram showing the relationship between air volume and dehumidification performance in FIG.

FIG. 10 is a characteristic diagram showing the relationship between the air volume and the inductive resistance in FIG.

11 is a temperature pattern diagram according to a conventional time.

12 is a temperature pattern diagram according to the present invention time.

13 is a control flowchart showing the operation of the conventional clothes dryer.

14 is a flow chart illustrating the operation of the dehumidifying clothes dryer of the present invention.

* Explanation of symbols for main parts of the drawings

21: motor 22: drum

24: PCT heater 25: temperature sensor 2

26 duct 27 drain

28: temperature sensor 1 29: heat exchange fan

30: fan case 31: damper

32: heater case

The present invention relates to a clothes dryer that can shorten the drying time without reducing the drying performance by controlling the internal circulation air volume in multiple stages. In particular, the air volume for drying air is controlled by a damper without reducing the air volume for cooling. The present invention relates to a dehumidifying clothes dryer having a function of controlling air volume for drying to reduce energy consumption by controlling power amount without lowering dehumidification performance.

As shown in FIG. 1, the conventional clothes dryer has a motor 1 for driving the drum 2 and the heat exchange fan 9, and a PTC that supplies a heat source. Heater 4, a heat exchange fan 9 for circulating drying air and cooling air and allowing heat exchange to be carried out, and drying air generated from the heat exchange fan 9 toward the PTC heater 4 A duct 6 having a drain hole 7 for discharging the dehumidified water, a temperature sensor 8 for detecting the temperature inside the drum, and a temperature outside the drum after dehumidification. It consists of a temperature sensor 25, a rotational speed sensor 11 for detecting the rotational speed of the motor 1, a fan pulley 12 and the like inserted into the motor shaft (13).

In the circuit configuration of the conventional clothes dryer, as shown in FIG. 2, the power supply unit 14 for supplying power to each part necessary for the dryer to operate and the output values of various sensors are recognized to recognize the drying state, The microcomputer 17 which performs load control according to the above, and receives the temperature value of the drum before and after the drying sensed by the temperature sensor 1 (8) and the temperature sensor 2 (5) and converts it into digital data to convert the microcomputer (17). Analog digital conversion unit 16 to be transmitted to), the rotational speed detection unit 11 for detecting the rotational speed (RPM) of the motor 1 and outputting to the microcomputer 17, and the microcomputer 17 And a load driver 15 for driving the load of the motor 1 and the heater 4 and the like according to the control output.

Looking at the prior art configured in this way in more detail as follows.

When the garment to be dried is put in the drum 2 and the start key is pressed, the microcomputer 17 recognizes the load and load driving signal for driving the motor 1 and the PTC heater 4 by the load driving unit 15. Outputs

Then, the motor 1 rotates by the operation of the load driver 15, and the PTC heater 4 operates to generate heat.

The heat generated in this way is supplied into the drum 2 and penetrated into the clothes.

The motor 1 and the PC heater 4 start to operate and proceed with the temperature pattern shown in FIG. 11 as time passes.

At this time, the small amount (S) will reach the temperature limit line (T _P ) faster than the large amount ( _S ).

Accordingly, the microcomputer 17 turns the PTC heater 4 on or off so as not to damage the garment so as not to exceed the temperature limit line T _P.

At this time, when the quantity is small, the section in which the PTC heater 4 is turned off is a part without heat generation, so that the time is delayed by that much and the drying time is increased.

For example, as shown in FIG. 11, when the amount is small, the drying time delay becomes Δtl + Δt2 + Δt3, and when the amount is large, Δt4 + Δt5, so that the drying time increases when the quantity is small. At this time, the heat exchange fan 9 discharges the drying air inside the drum to the outside of the drum, and sucks cold air introduced from the outside together with the discharged drying air and sends it to the duct 6.

Then, the drying air and the cold air introduced from the outside are mixed to condense the moisture and discharge the changed water to the drain 7, and the mixed air not changed into the water passes through the duct 6 to the PTC heater 4. To pass.

The PTC heater 4 then heats the delivered mixed air and supplies the heated air into the drum 1.

After a certain time after the motor 1 and the PC heater 4 start to operate, the microcomputer 17 converts the signal detected by the temperature sensor 1 (8) and the temperature sensor 2 (5) into analog / digital conversion. The unit 16 receives a data value converted into a digital signal and detects a quantity.

At this time, the temperature sensor 1 (8) detects the temperature inside the drum 1, the temperature sensor 2 (5) detects the temperature outside the drum after dehumidification and outputs it to the analog / digital conversion unit 16.

Here, as to the quantity detection method, as shown in FIG. 12, the temperature sensor value (ΔT = temperature sensor 1-temperature sensor 2) after a predetermined time (t) is obtained, and the obtained temperature sensor value (ΔT) is obtained. Quantity detection (q = 1 / ΔT) is performed.

At this time, if the detected amount of water is small and the clothes are weak to heat (for example, thin clothing, chemical fibers, lingerie), the microcomputer 17 drives the speed of the motor 1 at a predetermined speed (RPM). do.

In addition, when the clothing to be dried is not weak to heat and has a large amount of water, the same pattern as described above is performed. The reason is that the PTC heater 4 has a low power, as shown in the graph shown in FIG. This is because the internal temperature of the drum also decreases.

Therefore, when the drum's internal temperature is dried at a low temperature that does not cause clothing damage, and the drying degree reaches ΔT above 100% of K, the drying is judged to be complete and the motor 1 and the PTC heater 4 which are loads are turned off. And end the drying operation.

In the clothes dryer operating as described above, the PTC heater 4 controls the air volume by controlling the speed of the heat exchange fan 9 which is the air volume generation source because the power is controlled by the air volume, and most of them control the speed of the motor. By changing the speed of the heat exchange fan or by installing a motor for driving the fan separately, the air volume is changed by adjusting the speed.

At this time, the rotational speed (RPM) sensor 11 for detecting the rotational speed of the motor 1 is a fan pulley made of a permanent magnet fixed to be rotatable by engaging with the motor shaft 13 as shown in FIG. When the 12 is rotated, it is fixed to the outer case so that the Hall sensor detects the N pole and the S pole of the permanent magnet of the fan pulley 12 and transmits it to the rotation speed sensor 11 to detect the rotation speed.

FIG. 5 (b) shows the output waveform diagram of the high speed rotation and the low speed rotation state of the permanent magnet sensed by the rotation speed sensor 11.

As described above, referring to FIG. 13, the temperature detected by the temperature sensors 1, 2 (8) and 5 after turning on the motor 1 and the TPC heater 4 is described. Based on the detected quantity (q) (S1).

After sensing the quantity, it is checked whether the clothing to be dried is a thin clothing drying course which is weak to heat such as chemical fiber. (S2)

If the thin clothing drying course in the step S2, the motor 1 is driven at a predetermined rotational speed (RPM) (S3), and then the difference (ΔT) between the drum internal temperature and the drum internal temperature is a predetermined value (K). If larger, it is determined that the drying is completed, the motor 1 and the PTC heater 4 are turned off and finished. If not, the motor 1 is continuously driven at a predetermined rotational speed RPM (S4).

And if it is not a thin clothing drying course in step S2, and if the quantity is small (S5) to rotate at a predetermined rotational speed as in the step S3, if the amount is large continue to the existing operating speed (RPM) To operate (S6). After that, if the difference between the drum internal temperature and the drum external temperature (ΔT) is greater than the predetermined value (K), it is determined that drying is completed, and the motor drying (1) and the TPC heater (4) are turned off to finish the drying of clothes. If not large, wait until the temperature difference ΔT is larger than the predetermined value K. (S7)

The clothing is dried by the same process as described above.

However, in the prior art operating as described above, as shown in FIG. 9, when the speed of the heat exchange fan is lowered to decrease the power, the dehumidification performance is insignificant in the drying air volume but largely depends on the cooling air volume. The air volume for drying is lowered, so the power is lowered, but the air volume for cooling is also reduced, resulting in poor dehumidification performance. Also, it is difficult to control the air volume linearly, so that the heater is turned on / off by a predetermined rotational speed (RPM). There is a problem in that the drying time is long.

Therefore, an object of the present invention for solving the conventional problems as described above is a dehumidifying clothes dryer having a drying air air volume control function to adjust the power by controlling the amount of air flowing into the PTC heater by the damper It is to provide.

Another object of the present invention is to provide a dehumidifying clothes dryer having a function of controlling the air volume for drying to allow the power control of the heater to be controlled by controlling the internal circulation air volume in multiple stages.

Still another object of the present invention is to provide a dehumidifying clothes dryer having a function of controlling air volume for drying to further improve performance and to shorten the drying time by making the heat exchange amount as in the prior art.

Another object of the present invention is to control the amount of power without reducing the dehumidification performance by controlling by the damper to shorten the drying time to prevent damage to clothes with water, to reduce energy consumption by reducing the power consumption drying air It is to provide a dehumidifying clothes dryer with air flow control.

The dehumidifying clothes dryer having a function of controlling the air volume for drying to achieve the above object is a motor 21 for driving the drum 22 and the heat exchange fan as shown in FIGS. 3 and 4, and a heat source. PTC heater 24 as a source to be supplied, a heat exchange fan 29 for circulating drying air and cooling air and performing heat exchange, and air generated in the heat exchange fan 29 To be moved toward the PTC heater 24, the duct 26 having a drain 27 for discharging the dehumidified water, and installed between the duct 26 and the heater case 32 for drying air Damper 31 for controlling the amount of air flows toward the heater 24, a temperature sensor 1 (28) for detecting the internal temperature of the drum (1), and a temperature sensor for detecting the external temperature of the drum (1) after dehumidification 2 (25), a current sensor 34 for detecting a load current characteristic, and a value obtained through the sensors. It consists of a microcomputer (37) for recognizing the drying progress state of the clothing and controlling the respective parts according to the clothes, and a damper position detecting unit (36) for detecting the position of the damper (31).

Referring to the operation and effects of the present invention configured as described above in detail.

When the clothes to be dried are put in the drum 22 and the start key is pressed, the microcomputer 27 recognizes them and outputs a driving signal to the load driver 35 to drive the motor 21 and the PTC heater 24. do.

Then, the drum 21 rotates at a predetermined rotational speed RPM, and the PTC heater 24 heats the air outside the drum to supply the drum 1 to the inside.

The microcomputer 37 drives the heat exchange fan 29.

Then, the heat exchange fan 29 sucks the dry air discharged from the drum and cold air introduced from the outside of the clothes dryer to perform a heat exchange operation.

Accordingly, the drying air and the cold air are mixed to condense moisture and discharged into water through the drain hole 27, and the other mixed air is transferred to the duct 26.

At this time, as shown in (a) of FIG. 6, the damper 31 located between the duct 26 and the heater case 32 is set to the maximum off state (a position) as shown in (b) of FIG. Let this be the maximum.

In FIG. 6B, the size of Q 'is c plane b plane a plane.

While the clothes drying operation is performed for a predetermined time by the same operation as described above, when a predetermined time t elapses, the microcomputer 37 inputs the temperature from the temperature sensor 1 (8) and the temperature sensor 2 (5), respectively. The temperature difference DELTA T is obtained, and the quantity of water is sensed using the temperature difference DELTA T.

That is, the temperature sensor 1 (28) detects the drum internal temperature, the temperature sensor 2 (25) detects the drum external temperature and outputs to the analog / digital conversion unit 19, respectively, the analog / digital conversion unit 19 ) Converts the sensed temperature value into digital data and transmits it to the microcomputer 37.

Accordingly, the microcomputer 37 calculates the temperature difference ΔT (ΔT = sense temperature of the temperature sensor 1-sensing temperature of the temperature sensor 2) to determine the amount of the quantity ( )

At this time, if it is determined that the calculated quantity is obtained or the temperature sensed by the temperature sensor 1 (28) during operation has reached the temperature limit line (T _P ), the microcomputer 37 controls the load driver 35 to The damper 31 is closed by only a predetermined amount in the fully open state in one step so that the air volume decreases. At this time, the air volume varies depending on the positions a, b, and c of the damper 31 shown in (b) of FIG. 6. For example, the relationship between the air volume and resistance shown in FIG. 10 is a graph. If the position of the damper 31 changes from a to c at, the intersection of the drying air curve and the heat exchange fan characteristic curve curve becomes small from Q11 to Q'11 at the damper position.

Eventually, when the air volume changes from Q8 to Q'8 as shown in FIG. 7, the power decreases from P8 to P'8 so that the temperature pattern of the present invention increases gradually as shown in FIG. The on / off section of 24) does not occur.

In addition, the microcomputer 37 senses the amount of current by the current sensor 34, checks the change of the temperature sensor 1 (28) per unit time, and if the constant period with little change occurs, the drying proceeds at the damper position. If the temperature sensor 1 (28) changes per unit time even in the first stage damper position, the damper position is closed in two stages so that the air volume is further reduced so that the damper is changed by the change of the current sensor 34 and the temperature sensor 1 (28). Determine the proper location and proceed with drying.

When the temperature difference ΔT at which the degree of drying is 100% reaches a predetermined value (K: constant constant), it is determined that the drying is completed, and the motor 21 and the PTC heater 24 are turned off and the drying is finished.

Since the cooling air does not change as the drying air is controlled by the damper 31 as described above, the dehumidifying performance generated by the rotation control method is reduced although the dehumidifying performance is slightly reduced as shown in FIG. Much less than degradation.

Referring to FIG. 14 again, the operation so far is detected by first turning on the motor 21 and the TPC heater 24 which are the loads, and keeping the damper 31 open as much as possible. )

If the amount detected in step S11 is a small amount, the damper 31 is closed by a predetermined amount in one step, and then the amount of current flowing through the load is sensed to check whether the power is supplied to the appropriate heater. If the power is not properly supplied, the damper 31 is closed again in two steps, and the process proceeds to the process of sensing the current amount. In addition, if the quantity is not a small amount in the above, it is determined whether the temperature detected by the temperature sensor 1 (28) exceeds the temperature limit line (T _P ), if it is exceeded, the damper 31 is closed in one step, and if not exceeded, the temperature in the drum If the temperature difference (△ T) after dehumidification is greater than the value of the temperature difference (K) when the drying degree is 100%, the drying is completed. Therefore, turn off the load, close the damper completely, and finish the drying.

As described in detail above, the present invention controls the drying air volume by means of a damper without reducing the cooling air volume, thereby reducing the amount of power and reducing drying time without deteriorating the dehumidification performance and preventing damage to clothing. It also has the effect of reducing energy consumption and saving energy.

Claims (1)

In the dryer for drying the clothes in the drum by driving the drum, the PTC heater and the heat exchange fan by driving the motor, the temperature sensor 1, 2 for sensing the drum inside and the drum outside temperature, respectively, the drying through the heat exchange fan A dehumidifying clothes dryer having a drying air air volume control function, further comprising a duct for moving the air to the PTC heater and a damper for controlling the air volume on one side of the duct.