KR101053608B1 - Control method of condensation type clothes dryer - Google Patents

Abstract

The present invention relates to a control method of a condensation type clothes dryer that prevents temperature rise due to no-load operation and improves drying performance for small loads. In the condensation type clothes dryer having a humidity sensor for detecting the step of performing a drying mode when the user inputs an operation start command; Periodically reading the dryness detected through the humidity sensor until the second preset time is reached after the preset first preset time elapses; Determining whether the dryness below the predetermined target value is detected one or more times or the dryness above the target value is continuously detected among the read dryness levels; If the dryness below the target value is detected at least once, determining the small load and continuing the drying mode until the preset third set time is reached; In addition, when the dryness higher than the target value is continuously detected, the operation is determined as a no load to perform the cooling mode.

Therefore, the present invention can detect no load and small load and improve the reliability and drying performance of the product by performing the appropriate stroke according to the load.

Dryer / Condensation / Humidity Sensor / No Load / Small Load

Description

Control method of condensing type clothes drier

1 is a longitudinal sectional view showing a structural example of a general condensation type clothes dryer

Figure 2 is a cross-sectional view of the main part of the condensation type clothes dryer of Figure 1

3 is a flowchart showing a control method of the condensation type clothes dryer according to the present invention.

4 is a diagram illustrating the administrative process of the present invention according to time.

The present invention relates to a condensation type clothes dryer, and more particularly, to a control method of a condensation type clothes dryer that can prevent the temperature rise due to no-load operation and improve the drying performance for a small load.

In general, a clothes dryer is a device that blows hot air generated by a heater into a drum to dry a drying object, and is largely an exhaust type clothes dryer and a condensation type according to a treatment method of wet air generated by drying a drying object. It is classified as a clothes dryer.

The exhaust type clothes dryer uses a method of discharging the wet air discharged from the drum to the outside of the dryer, and the condensation type clothes dryer removes moisture by condensing the wet air discharged from the drum in the condenser, and the dried air is removed from the drum. Send and recycle.

The structure of the condensation type clothes dryer will be described with reference to FIGS. 1 and 2 as follows.

1 and 2 show the structure of the condensation type clothes dryer according to the present invention, arrow I in these figures shows the flow of outside air, arrow II shows the flow of circulating air.

As shown in the drawing, a drum 11 in which a drying object is accommodated is rotatably installed in a main body 10 having a door 12 installed at a front surface thereof, and the drum 11 is a motor installed under the main body 10. It is connected to the belt 19 by 17 and is comprised so that it may rotate.

In addition, a condenser 13 is installed below the main body 10 to condense the hot and humid air circulating through the drum 11 to remove the moisture to make the circulated air dry. The front part and the rear part are connected to the circulation duct 14 connected to the front and the rear of the drum 11, respectively, and the air discharged through the drum 11 passes through the condenser 13 and flows back into the drum 11 again. It is configured to be.

In addition, the circulation duct 14 is provided with a heater 15 for heating the air passing through the condenser 13 and a circulation fan 16 for forcibly circulating the air through the circulation duct 14, the circulation The fan 16 is configured to be connected to and drive on another axis of the motor 17 which drives the drum 11.                         

On the other hand, in order to condense the air circulated through the circulation duct 14 by heat exchange in the condenser 13, the external cold air must be supplied to the condenser 13, one side of the condenser 13 for this purpose The outside air supply duct 18 is connected to the outside of the main body 10, the outside of the condenser 13 connected to the outside air supply duct 18 is forced to suck the outside air through the outside air supply duct 18 to the main body A cooling fan 20 and a cooling fan driving motor 21 for discharging into 10 are installed.

Here, the cooling fan drive motor 21 is a variable speed motor capable of speed conversion, a BLDC motor (Brushless DC Motor), etc. may be used, the motor 17 for rotating the circulation fan 16 and the drum 11 Separately from) drives only the cooling fan 20.

On the other hand, the lower part of the condenser 13, a condenser (not shown) for collecting condensed water generated during the condensation process and the condensate reservoir for forcibly discharging the condensed water collected in the drip tray to the outside or installed in the main body (10) The pump 23 conveying by (not shown) is provided.

Reference numeral 22 is a lint filter that filters foreign substances such as seams from the air discharged to the circulation duct 14 through the front of the drum 11.

In addition, a humidity sensor 30 is installed at the front lower side of the drum 11 to detect a degree of drying of the drying object.

The humidity sensor 30 has two metal plates side by side and wires are connected to each metal plate. When the object to be dried is contacted between the metal plates on both sides, the resistance value of the object to be dried is changed to a microcontroller (not shown). ) To detect the dryness of the object to be dried.

That is, the humidity sensor 30 is in a state in which the circuit is electrically connected when the dry object containing moisture comes into contact with both metal plates at the same time, and the dry object acts as a resistance in the circuit to measure a voltage value corresponding thereto. The controller is supposed to read it.

In addition, if the moisture content decreases while the drying object is dried, the resistance value increases in inverse proportion to this, and the voltage value increases in proportion to the resistance value.

Thus, when the voltage value measured by the humidity sensor 30 reaches a constant value, the microcontroller determines that the drying is completed and controls the operation of the dryer.

Here, the cooling time for lowering the temperature inside the dryer increased due to the drying stroke by setting the time to enter the cooling mode after the completion of the drying stroke to the time when the degree of drying of the drying object detected by the humidity sensor 30 is more than the target value. You can control the stroke.

However, the clothes dryer according to the prior art detects the drying state of the drying object only by the two metal plates installed in front of the humidity sensor 30, that is, the drum 11, and thus detects when the capacity of the drying object is small (small load). This did not happen.

For example, when a small amount of the drying object is added or the drying object is confined to the rear of the drum 11, the contact with the humidity sensor 30 is not made, and thus the dryness of the drying object is not detected even in a state in which the drying is in progress. In this case, there is a problem in that drying performance is deteriorated, such as ending the drying administration by determining that drying is completed in a state where drying is not completely performed.

In addition, when the drying administration is performed without the object to be dried due to mischief or carelessness of a young child, there is no way to detect such a no-load state in the related art, and thus circulating air is abnormally increased due to continuous heating of the heater. It caused product damage.

The present invention is to solve the above problems, it is an object of the present invention to provide a control method of the condensation type clothes dryer to prevent the abnormal temperature rise by detecting no load.

Another object of the present invention is to provide a control method of a condensation type clothes dryer which can sense a small amount of load and improve the drying performance for the small amount of load.

In order to achieve the above object, the present invention is mounted on the front of the drum inside the condensation type clothes dryer having a humidity sensor for detecting the dryness by the contact with the clothes, when the user inputs the operation start drying mode Performing; Periodically reading the dryness detected through the humidity sensor until the second preset time is reached after the preset first preset time elapses; Determining whether the dryness below the predetermined target value is detected one or more times or the dryness above the target value is continuously detected among the read dryness levels; If the dryness below the target value is detected at least once, determining the small load and continuing the drying mode until the preset third set time is reached; And, if the dryness above the target value is continuously detected provides a control method of the condensation type clothes dryer comprising the step of performing a cooling mode to determine no load.

Therefore, according to the present invention, by providing a dry object, that is, a load sensing algorithm, a small load can be sensed as well as no load to perform a more suitable drying operation.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described.

Since the clothes dryer component of the present invention is the same as in the prior art, the same name and the same reference numeral are used for the convenience of description and detailed description thereof will be omitted.

Referring to Figure 3, the control method of the condensation type clothes dryer according to the invention in detail as follows.

In the present invention, the humidity sensor 30 uses a contact electrode sensor and is configured to be mounted on the front of the drum 11 to sense the dryness of the cloth.

In addition, the humidity sensor 30 may be used to detect the dryness of the cloth (load) and determine whether there is no load or a small load.

First, when a user inputs a drying object in a wet state into the drum 11 and then selects a drying mode to start operation, a drying operation using warm air is performed (S12).

The drying stroke will be described in detail, thereby driving the motor 17 to rotate the circulation fan 16 and the drum 11 and to drive the heater 15. Accordingly, air flows through the circulation duct 14. The air flowing through the circulation duct 14 is heated to a high temperature by the heater 15 and then flows into the drum 11.

On the other hand, the outside air introduced by the cooling fan 20 is supplied to the condenser 13 through the outside air supply duct 18 and then heat exchanged through the condenser 10 to the outside through one side of the main body 10 After being discharged and drying the object to be dried in the drum 11, the hot and humid air is condensed by heat exchange as it passes through the condenser 13 to be dried, and then heated by the heater 15 again to form a drum ( 11) flows into.

After the drying operation is started, it is determined whether a predetermined first set time T1 has elapsed (S14).

Here, the first set time T1 is a time (for example, 1 minute and 30 seconds) to sufficiently heat the circulating air inside the main body 10 to a proper temperature after a user's driving start command is input.

As a result of the determination (S14), the dryness detected through the humidity sensor 30 is periodically read from the time point when the first setting time T1 elapses until the second setting time T2 is reached (S16, S18).

In this case, the second set time T2 is a time (for example, 12 minutes) for collecting dryness data required to determine the amount of the drying object put into the drum 11, that is, no load or small load.

It is determined whether the data below the predetermined target value MAX is detected one or more times among the dryness data read in the above process, and at the same time, whether the data above the target value MAX is continuously detected (S20). .

As a result of the determination (S20), when data more than the target value MAX is continuously detected, the drum 11 is recognized as a no-load state in which there is no drying object and a predetermined cooling time in the state in which the heater 15 is turned off (normally, 10 minutes) to perform the cooling mode (Cooling Mode) (S22).

On the other hand, when the determination result (S20), the data below the target value (MAX) is detected more than once, when it is recognized as a small load state that even a single drying object exists and reaches the preset third set time (T3) Continue the drying mode until (S24).

In this case, the third set time T3 is a time for sufficiently drying the drying object (for example, five or less garments) defined by a small load, and the first to third set time T1 ( T2) (T3) is determined by simulation before shipment.

Thereafter, when the dryness level of the dry object detected by the humidity sensor 30 reaches a target value, the drying state is recognized as a completion state and the cooling mode is performed for a preset cooling time (S26 to S30).

Therefore, the present invention can detect no load or small load using the dryness data detected by the humidity sensor 30.

As shown in FIG. 4, the heater has a heating section for heating the circulating air from the time when the user's operation start command is input to the first setting time T1, and then dried until the second setting time T2 is reached. Collect data too.

Subsequently, by using the collected dryness data, it is determined whether there is no load or a small load at a time point when the second set time T2 elapses, and an appropriate stroke is performed for the no load and the small load.

The present invention is not limited to the above-described embodiments, and can be modified by those skilled in the art as can be seen from the appended claims, and such modifications are within the scope of the present invention.

Referring to the effect of the control method of the condensation type clothes dryer according to the present invention described above are as follows.

First, it is possible to detect no load and small load and improve the reliability and drying performance of the product by performing proper stroke according to the load.

Second, no load can be detected to prevent damage to the product due to abnormal temperature rise.

Third, it is possible to improve the drying performance of the small load by preventing the end of the stroke in a state where the drying is not made by misjudged the small load at no load.

Claims (2)

In the condensation type clothes dryer having a humidity sensor mounted on the front of the drum and detecting the dryness by contact with the clothes, Performing a drying mode when a user inputs an operation start command; Periodically reading the dryness detected through the humidity sensor until the second preset time is reached after the preset first preset time elapses; Determining whether dryness below a predetermined target value is detected at least once or dryness above the target value is continuously detected among the read dryness levels; If the dryness below the target value is detected at least once, determining the small load and continuing the drying mode until the preset third set time is reached; And, If the dryness is more than the target value is detected continuously, the control method of the condensation type clothes dryer, characterized in that the step of performing a cooling mode to determine the no load. The method of claim 1, The first set time T1 is a time for heating the circulating air inside the main body to a proper temperature after a user's operation start command is input, and the second set time T2 determines whether there is no load or a small load. It is a time for collecting the dryness data required for the control, wherein the third set time (T3) is the time to dry the drying object defined by the small load to the target dryness, the control of the condensation type clothes dryer, Way.

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