KR102521865B1 - Dryer and method for clothes - Google Patents

Abstract

The present invention relates to a dryer and a control method thereof, which detects the amount of laundry stored in a drum, sets the rotational speed of the motor for a drying operation in response to the amount of laundry, and sets the laundry detection unit during drying. The rotational speed of the motor is changed in response to the dryness level of the laundry sensed by the laundry, so that the laundry is dried in a set drying time, so that the amount of laundry can be accurately calculated and the laundry is overdried or underdried. It is possible to effectively dry the laundry by solving the problem, shorten the drying time, and change the setting according to the amount and dryness of the laundry, thereby preventing the laundry from being damaged and thus saving energy. .

Description

Dryer and its control method {Dryer and method for clothes}

The present invention relates to a dryer for clothes and a control method thereof.

In general, a laundry treatment machine is a device that processes laundry through various actions such as washing, spin-drying, and/or drying, and collectively refers to a washing machine, a dehydrator, and a dryer.

The dryer is a device for drying laundry by blowing hot air into a drum into which wet laundry is put while rotating the drum.

Dryers can be divided into exhaust type dryers and condensation type dryers according to a method of treating humid air discharged from a drum after drying clothes. In addition, the dryer uses a heat pump to reduce energy consumption by using heat energy discarded in the process of exhausting or condensing to heat air.

Such a dryer is configured to dry the laundry for a predetermined time by setting a drying time according to the type of laundry rather than the amount of laundry as the laundry is dried using hot air.

Dryers have a problem in that a drum constantly rotates at a set rotational speed, and when operated for a set time, a difference occurs in the drying state of laundry depending on the amount of laundry loaded even for the same type of laundry.

In the prior art JP2017-108870, a method such as changing the drying time based on the temperature is adopted. However, if the temperature increases, the drying speed can be improved, but the laundry may be damaged, so there is a limit to increasing the temperature. In addition, the increase in drying time increases user's inconvenience as drying is not completed within the initially set time.

On the other hand, the method of setting the operation time according to the amount of laundry has been applied to conventional washing machines.

However, unlike a washing machine, a dryer has a difference in dry weight and wet weight because wet laundry is put in, and a dryer has a difference in that the change in rotational speed is not large during the drying operation, and the friction of the laundry, Since a washing machine for the purpose of removing foreign substances using dropping and a dryer for the purpose of drying have different driving methods, there is a limit to the application of the washing machine method.

In particular, since laundry in a wet state is heavier than laundry in a dry state, a lot of current is required for initial driving, and the amount of laundry measured is different due to the position of the initial laundry and the movement of the laundry by motor driving. .

In addition, there is a problem in that the amount of clothes sensed varies depending on the driving method for rotating the drum of the dryer, the speed of rotating the drum, and time.

In addition, unlike washing machines, dryers do not discharge moisture from wet laundry by centrifugal force, but dry clothes by hot air and drum rotation. When the drum is rotated at high speed, the laundry does not adhere to the drum and is not dried. In addition, when rotating at a low speed, there is a problem in that only a part of the laundry is dried because the movement of the clothes in the drum is small.

Accordingly, in order to dry the laundry, it is necessary to set the rotation speed in consideration of the amount of laundry in the drum.

An object of the present invention is to provide a dryer and a control method thereof, which quickly and accurately determine the amount of laundry loaded into the dryer and control a drying operation in response to the amount of laundry. .

The dryer according to the present invention applies operation power to a drum containing laundry, a motor for rotating the drum, a blowing fan for circulating air passing through the drum, and the motor to operate or stop the motor, and the motor a drive unit for controlling the rotational speed of the drum, a heat pump module for removing moisture from the air flowing into the drum and heating the air, a laundry sensor for detecting the dryness of the laundry, and a sensor for detecting the amount of laundry accommodated in the drum. It is divided into a sensing period and a drying period for drying the laundry, and in the sensing period, while the drum rotates and stops according to a set pattern, the amount of laundry is determined from the sensed current value, and in the drying period and a controller configured to set the rotational speed of the drum according to the amount of laundry to perform a drying operation.

In addition, the dryer of the present invention applies operation power to a drum accommodating laundry, a motor rotating the drum, a blowing fan circulating air passing through the drum, and the motor so that the motor operates or stops. A driving unit for controlling the rotational speed of the motor, a heat pump module for removing moisture from the air flowing into the drum and heating the air, and setting the rotational speed of the motor for a drying operation in response to the detected amount of laundry. and a control unit that changes the rotational speed of the motor in response to the dryness level of the laundry detected by the laundry detection unit during drying so that the laundry is dried at a set drying time.

The control unit may divide the amount of laundry into a plurality of stages and set the rotational speed to increase in stages corresponding to the amount of laundry.

The control unit may change settings to increase, maintain, or decrease the rotational speed of the motor in response to the dryness level and the amount of laundry in units of set time.

The controller classifies the dryness level into a plurality of levels, reduces the rotational speed of the motor by one level in the case of the first dryness level in which the laundry is overdried, and rotates the motor in the case of the second dryness level in the normal state speed is maintained, and in the case of the third dryness degree, which is less dry, the rotational speed of the motor is increased by one step.

A method for controlling a dryer according to the present invention includes the steps of rotating a drum loaded with laundry and sensing the amount of laundry, setting a rotational speed for a drying operation corresponding to the amount of laundry, and adjusting the rotational speed to the set rotational speed. Correspondingly, the drum is rotated and the air is circulated by a blower fan to dry the laundry; the drying operation detects the dryness level of the laundry; and changing the rotational speed.

The setting of the rotational speed may include dividing the amount of laundry into a plurality of stages, and setting the rotational speed to increase in stages corresponding to the amount of laundry.

The setting of the rotational speed may include classifying the amount of laundry into a very small amount, a small amount, a heavy amount, and a large amount of laundry, and setting the rotational speed to a first rotational speed in case of a very small amount of load; Setting a second rotational speed faster than the first rotational speed, setting the rotational speed to a third rotational speed faster than the second rotational speed in the case of a heavy load, and the rotational speed in the case of a large load. Further comprising the step of setting to the fastest fourth rotational speed.

Dividing the dryness level into a plurality of stages, reducing the rotational speed by one stage in the case of the first dryness level in which the laundry is overdried, and maintaining the rotational speed of the motor in the case of the second dryness level in the normal state. and increasing the rotational speed of the motor by one step in the case of the third drying degree less dry.

During the drying operation, the method may further include re-detecting the dryness level in units of set time, and resetting the rotational speed in response to the rediscovered dryness level.

The dryer according to the present invention configured as described above and the control method thereof measure the amount of laundry by measuring the current supplied to rotate the drum with respect to the laundry put into the dryer and extracting the force acting on the laundry in the drum. By doing so, the amount of laundry can be accurately calculated.

According to the present invention, by setting a drying time considering both the amount of laundry and the type of laundry, the problem of over-drying or under-drying of laundry can be solved and the laundry can be effectively dried.

According to the present invention, the drying time can be shortened by setting the drying time according to the amount of laundry and performing the drying operation.

The present invention can prevent laundry from being damaged by changing settings according to the amount and dryness of laundry.

In addition, the present invention can save energy by setting the drying time or the rotational speed during the drying operation according to the amount of laundry and changing the setting according to the drying degree.

1 is a perspective view of a dryer according to an embodiment of the present invention.
2 is a diagram showing the configuration of a heat pump module of the dryer of FIG. 1;
FIG. 3 is a diagram referenced to explain air circulation and refrigerant circulation of the dryer of FIG. 1;
4 is a schematic block diagram of a control configuration of a dryer according to an embodiment of the present invention.
5 is a schematic block diagram showing the control configuration of the heat pump of the dryer of the present invention.
6 is a diagram illustrating an operation pattern for detecting the amount of laundry in the dryer according to an embodiment of the present invention.
7 is a flowchart illustrating a method for controlling a dryer according to an embodiment of the present invention.
8 is a flowchart illustrating a control method according to the amount of laundry in the dryer according to an embodiment of the present invention.
9 is a flowchart illustrating a control method according to the drying degree of a dryer according to an embodiment of the present invention.
10 is a flowchart illustrating a method for changing the speed of a dryer according to an embodiment of the present invention.

Advantages and features of the present invention, and methods for achieving them, will become clear with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and can be implemented in various different forms, and the present embodiments make the disclosure of the present invention complete, and the common knowledge in the art to which the present invention belongs. It is provided to inform the holder of the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numbers designate like elements throughout the specification.

1 is a perspective view of a dryer according to an embodiment of the present invention, and FIG. 2 is a diagram showing the configuration of a heat pump module of the dryer of FIG. 1 .

The dryer 1 of the present invention is configured as shown in FIGS. 1 and 2 .

The dryer 1 according to the present invention includes a cabinet 10, a drum 30 disposed inside the cabinet and rotating laundry (cloth) therein, and a drive unit 60 for rotating the drum 30, , the heat pump module (50, 52, 53, 54, 58) that heats the air circulated in the drum 30 to dry the laundry and heats the circulated air, and the blower that circulates the air of the drum 30 A fan 64, a suction duct 68 in which air circulated from the drum 30 is sucked, a heater 69 for heating the air introduced into the drum 30, and a circulation passage 66 for guiding the flow of air includes

The cabinet 10 forms the exterior of the dryer and provides a space in which the drum 30 and other components are disposed. The cabinet 10 is formed in a rectangular parallelepiped shape as a whole.

A door 20 is disposed on the front of the cabinet 10, and the door 20 rotates left and right to open and close the inside of the cabinet 10.

The cabinet 10 includes a front cover 11, a top plate 16, side covers 12 and 13, a rear cover 15 and a base 14.

An inlet (not shown) is formed in the front cover 11, and a door 20 for opening and closing the inlet is provided. The inlet communicates with the drum 30.

The door 20 is rotatably coupled to the front cover 11 and may include a door glass 22 . The door glass 22 is made of a transparent member so that the user can look inside the drum 30 and has a convex shape toward the inside of the drum 30 .

A control panel 17 may be disposed above the front cover 11 . The control panel 17 includes a display (eg, LCD, LED panel, etc.) displaying the operating state of the dryer, and a control unit (eg, button, dial, touch screen, etc.) that receives operating commands for the dryer from the user. , a speaker (not shown) is included to output voice guidance, effect sounds, or warning sounds for operating states.

The drum 30 is disposed inside the cabinet 10, and the blowing fan 64 and the heat pump module are disposed below the drum 30 to maximize the capacity of the drum 30.

The drum 30 is formed in a cylindrical shape, the front and rear surfaces are open, and the front surface communicates with the inlet. In addition, an inlet (not shown) is formed on the rear surface of the drum 30 so that air can flow in, and the inlet is connected to a circulation passage for air circulation.

A lifter 31 is installed inside the drum 30, and the lifter 31 lifts the laundry inside while rotating, and then allows the laundry to fall freely. The drum is supported by a supporter (not shown) provided in the cabinet.

The drive unit 60 includes a motor fixed to the base 14 of the cabinet 10 . The motor provides power for rotating the drum and is also connected to the blowing fan 64 to rotate the blowing fan. The motor is a double-axis motor, and the drum 30 and the blowing fan are connected to each drive shaft. If necessary, a plurality of motors are provided so that the drum and the blowing fan can be operated by the motors connected to each other.

The motor includes a drive pulley (not shown) on which a drive belt (not shown) wound around the drum 30 is hung on a drive shaft to which the drum is connected. The rotation of the motor may rotate the drum 30 forward or reverse. An idle pulley (not shown) may be installed to adjust the tension of the drive belt. The driving belt may wrap the outer circumferential surface of the drum 30 while being caught by the driving pulley and the idle pulley. When the motor rotates, the drive belt is transported by the drive pulley, and the drum 30 is rotated by the frictional force acting between the drive belt and the drive belt.

The blowing fan may be rotated by a motor of the driving unit 60 . By rotation of the blower fan, the air in the drum 30 is introduced into the suction duct. The suction duct 68 may be included in the circulation passage 66.

When the blowing fan 64 rotates, the air discharged from the drum 30 is guided to the suction duct 68 and supplied to the blowing fan 64 . The suction duct 68 is coupled to the front surface of the front supporter and communicates with the suction port of the blowing fan 64. The blowing fan 64 circulates the air by allowing the air sucked from the drum to flow back into the drum through the heat pump module through the circulation passage 66 .

When the drum 30 rotates forward, air is introduced into the inside from the rear side and discharged from the front side. In addition, when the drum rotates in reverse, air may be introduced to the front side and air may be discharged to the rear side.

The circulation passage 66 may be configured in various ways according to embodiments. The circulation passage 66 guides the air discharged from the blowing fan to flow into the heat pump module, and also guides the air discharged from the heat pump module to flow into the drum through the heater. The circulation passage 66 is also provided on the rear side of the drum to guide heated air to flow into the drum 30 .

A circulation passage passing through the drum 30 may be formed in various ways. The circulation passage 66 may be connected to the drum to form a closed loop for air circulation. In addition, the circulation passage may be connected to an exhaust duct (not shown) for discharging air and a suction duct (not shown) through which outside air is introduced.

The filter assembly 19 is installed in the inlet and collects lint contained in the air discharged from the drum 30 and introduced into the suction duct.

FIG. 3 is a diagram referenced to explain air circulation and refrigerant circulation of the dryer of FIG. 1; As shown in FIG. 3 , the air supplied to the drum 30 heats the laundry, absorbs moisture evaporated from the laundry, and is discharged.

Air is circulated by the blowing fan (64).

Air is introduced into the evaporator 53 through the drum by a blowing fan, is condensed in the evaporator, and flows into the condenser 52 in a low-temperature, low-humidity state. The air is heated by heat exchange with the refrigerant in the condenser 52 and then introduced into the drum 30 again. Air may be additionally heated through a heater 69 installed on the circulation passage.

Either one of the heat pump module and the heater 69 can be selectively operated, and can be operated simultaneously.

Air moves in the order of the drum 30, the evaporator 53, and the condenser 52.

The refrigerant is discharged to the condenser 52 at high temperature and high pressure by the compressor 50, exchanges heat with air in the condenser, and then flows into the evaporator 53 to be evaporated. An expansion valve 59 is installed between the condenser and the evaporator. The expansion valve expands the low-temperature and high-pressure condensed refrigerant and delivers it to the evaporator. The expanded refrigerant is evaporated in the evaporator 53, introduced into the compressor 50 in a low temperature and low pressure state, and then discharged to the condenser 52 in a high temperature and high pressure state.

The heat pump module circulates the refrigerant and operates as a heat pump cycle.

Laundry accommodated inside the drum 30 is dried by heated air supplied to the drum. The air discharged from the drum absorbs moisture evaporated from the laundry during the drying process, flows into the circulation passage, is heated through a heat pump module, and then supplied to the drum again.

The heat pump module includes a compressor 50, a condenser 52, an evaporator 53, and an expansion valve.

In the heat pump module, the compressor 50, the condenser 52, and the evaporator 53 are connected by a refrigerant pipe so that the heated air is supplied to the drum through the circulation of the refrigerant and the heat exchange between the refrigerant and the air in the condenser and the evaporator. do. In some cases, the heat pump module may exchange heat through a medium other than a refrigerant.

The evaporator 53 heat-exchanges the air introduced from the drum 30 through the blowing fan 64 with the refrigerant to recover heat from the discharged air. In addition, the evaporator 53 condenses moisture contained in the introduced air.

The condenser 52 heat-exchanges the air passing through the evaporator 53 with the refrigerant, and discharges the heated air to the drum. The low-temperature, low-humidity air that passes through the evaporator flows into the condenser and is supplied to the drum in a high-temperature, low-humidity state by exchanging heat with the refrigerant.

The refrigerant discharged from the condenser passes through the evaporator and is returned to the compressor, the compressor 50 compresses the evaporated refrigerant and discharges it to the condenser, and the expansion valve expands the refrigerant condensed in the condenser 52 in the evaporator.

The condenser 52 and evaporator 53 are heat exchangers.

Since the high-temperature and high-humidity air discharged from the drum 30 has a higher temperature than the refrigerant of the evaporator 53, the heat of the air is condensed and cooled by exchanging heat with the refrigerant while passing through the evaporator. Accordingly, the hot and humid air is dehumidified and cooled by the evaporator. Condensate generated in the process of condensing air may be collected in a separate condensate housing (not shown) and drained.

In addition, the heat pump module may further include an auxiliary heat exchanger 54 and a cooling fan 58 . The auxiliary heat exchanger 54 is constituted by a detachable condensing module separated from the condenser 52 . The auxiliary heat exchanger and the cooling fan may be configured as one module or may be configured separately from each other.

The auxiliary heat exchanger 54 is installed in a refrigerant pipe extending from the condenser to the expansion valve based on the flow direction of the refrigerant, and cools the refrigerant discharged from the condenser.

The cooling fan cools the auxiliary heat exchanger by blowing air outside or inside the cabinet to the auxiliary heat exchanger.

4 is a schematic block diagram of a control configuration of a dryer according to an embodiment of the present invention. As shown in FIG. 4, the dryer 1 is configured as described above, and also includes a manipulation unit 170, an output unit 175, a communication unit 190, a driving unit 160, Includes power supply unit 150, heat pump module 120, pump 185, heater 69, sensor unit 130, memory 140, power supply unit 150, and control unit 110 that controls overall dryer operation do.

The control panel 170 includes at least one button installed on the control panel 17, a switch, and an input means such as a touch pad. The control unit 170 inputs operation settings including power input, operation mode, and laundry type settings. When the type of laundry is selected and the power key is input, the control unit 170 inputs operation setting data to the control unit.

The output unit 175 includes a display that displays information on operation settings input by the control unit 170 and outputs an operating state of the dryer, and a speaker or buzzer that outputs voice guidance, a predetermined sound effect, or a warning sound. include The display may include a menu screen for operation setting and operation control of the dryer, and may output a guide message or warning consisting of a combination of at least one of letters, numbers, and images for operation setting or operation status.

The memory 140 stores control data for operation control of the dryer, input operation setting data, operation mode data, and reference data for determining an error of the dryer. In addition, the memory 140 stores data sensed or measured during operation of the dryer and data transmitted and received through the communication unit. The memory 140 may be a storage device such as ROM, RAM, EPROM, flash drive, hard drive, etc. in terms of hardware.

The communication unit 190 transmits and receives data wired or wirelessly. The communication unit 190 can transmit/receive data by being connected to a network formed within a building or a predetermined distance, for example, a home network, and can also be connected to an external server such as the Internet and communicate with a terminal equipped with a control function. can The communication unit 270 transmits an operating state or a drying progress state of the dryer and receives a command for the dryer. The communication unit 270 transmits and receives data by including communication modules such as Wi-Fi and WiBro as well as short-range wireless communication such as ZigBee and Bluetooth.

The power supply unit 150 converts supplied commercial power to supply operating power. The power supply unit blocks overcurrent, rectifies and smooths the supplied power, and supplies operating power of a predetermined size.

The sensor unit 130 includes a plurality of sensors to measure the voltage or current of the dryer, detects the rotational speed of the motor, temperature, and humidity, and inputs them to the controller 110 .

The sensor unit 130 includes a door detection unit 131, a laundry detection unit 132, a temperature detection unit 133, a humidity detection unit 134, and a current detection unit 135. The sensor unit 130 may further include a pressure sensor to detect the pressure of the refrigerant of the heat pump module 120, a temperature sensor, and a speed sensor to detect the rotational speed of the motor or drum of the drive unit.

The temperature sensor 133 may detect the internal temperature of the drum, the temperature of the refrigerant of the heat pump module 120 or the temperature of the heat exchanger, the temperature of the heater 69, and the internal temperature of the control circuit. In addition, the temperature sensing unit is provided with a plurality of sensors, each installed at different positions to sense the temperature.

The humidity sensor 134 detects the internal humidity of the drum or the humidity of circulating air.

The laundry detecting unit 132 comes into contact with the laundry stored in the drum and detects the level of moisture contained in the laundry. The laundry detection unit may be included in the humidity detection unit, and may also be installed separately from the humidity detection unit.

The current sensing unit 135 senses the current applied to the motor of the driving unit 160 and inputs the sensed current value to the controller 110 .

The door detecting unit 131 detects whether the door 20 is opened or closed. The door detection unit 131 detects the open/closed state of the door before performing an operation according to the setting and inputs a detection signal to the control unit. In addition, the door detecting unit 131 detects whether or not laundry is jammed.

The heater 69 heats the air supplied to the drum to reach a predetermined temperature.

The heater driver (not shown) supplies operating power to the heater 69, controls the heater to operate or stop, and also controls the heating temperature of the heater. The heater driver may control the heater 69 differently between a case in which the heater 69 operates independently and a case in which the heater 69 operates simultaneously with the heat pump module 120 .

The pump 185 is operated by a pump driving unit (not shown) to discharge condensed water to the outside. The pump 185 discharges the condensed water received in the condensate housing by condensing moisture contained in the air recovered from the drum in the evaporator to the outside.

The driving unit 160 controls driving of the motor so that the motor rotates. The motor is connected to the drum 30 to provide power so that the drum rotates. In addition, the motor may be connected to the blowing fan 64 to rotate the blowing fan.

The driving unit 160 controls the motor to operate or stop in response to the control command of the controller 110, and also controls the rotational speed of the motor to operate at the set rotational speed. The driving unit 160 controls the rotation direction, rotation angle, and rotation speed of the motor according to the control command.

As the drum and the blower fan are connected to one motor, the driving unit 160 may simultaneously control the drum and the blower fan through motor control.

The drum is connected through a motor and a drive belt, and as the pulley is connected, the number of rotations of the motor relative to one rotation of the drum has a predetermined ratio. The rotational speed of the motor is different from the rotational speed of the drum. For example, a driving pulley may be installed such that the motor rotates 40 to 60 times while the drum rotates once.

In addition, the driving unit 160 may further include a separate motor connected to the blowing fan. When a plurality of motors are provided, the blowing fan can be operated regardless of the rotation of the drum.

The blowing fan 64 may rotate at the same speed as the rotational speed of the motor according to the connection structure with the drive shaft of the motor.

The blowing fan 64 controls the flow of air inside the dryer. The blowing fan 64 supplies heated air to the drum 30 and sucks air containing moisture from the drum so that it flows into the heat pump module 120 .

The heat pump module 120 includes a compressor 50 and a heat exchanger, removes moisture from circulated air through heat exchange with a refrigerant, and heats the air.

The control unit 110 stores operation settings input from the control unit 170 in the memory 140, processes data transmitted and received through the communication unit 190, and outputs the operation settings and operation status of the dryer through the output unit 175. control to be output. The controller may control the communication unit to transmit data of the dryer to the terminal when there is a terminal (not shown) loaded with an application for controlling the dryer and wirelessly connected to the dryer.

The control unit 110 controls the operation of the drum and the blowing fan through the driving unit 160 according to the operation setting input from the operation unit 170 and variably controls the operation according to the detected value of the sensor unit 130. The control unit 110 controls the heat pump module 120 during operation so that the circulating air is heated, and either the heater or the heat pump module operates, or both the heater and the heat pump module operate to supply the drum. control the temperature of the air being

The controller 110 controls a series of processes of drying laundry put into the drum. The controller 110 detects the amount of laundry put into the drum (cloth weight) and sets a drying time according to the amount of laundry. When the motor operates, the controller 110 stores and analyzes the current value detected by the current sensor 280 to determine the state of the motor and also determines the amount of laundry stored in the drum.

When the amount of laundry is detected, the controller 110 sets a rotational speed during the drying operation according to the amount of laundry. The rotational speed is the rotational speed of the motor, and when the rotational speed of the motor is changed, the rotational speed of the drum is changed accordingly.

During the drying operation, the controller 110 determines whether laundry is normally dried based on data sensed and input from a plurality of sensors of the sensor unit 130 . The controller 110 may change the drying time or the rotational speed of the motor according to the drying state of the laundry detected by the laundry detection unit.

The controller 110 increases or decreases the rotational speed of the motor by controlling the driving unit in response to the detected dryness and amount of laundry. The controller 110 may control the drum and the blowing fan by varying the rotational speed of the motor.

Also, the controller 1110 may control the air volume of the blowing fan. When the blowing fan and the drum are rotated by one motor, when the rotational speed of the drum is changed, the rotational speed of the blowing fan is also reduced, so that the amount of air blown is changed. On the other hand, when a blowing fan is provided separately, the air volume can be controlled regardless of the rotation of the drum.

During the drying operation, the controller 110 may determine the dryness level of the laundry at set time intervals and control the rotational speed of the motor in response to the dryness level and the amount of laundry.

In addition, the controller 110 may output an error through the output unit 240 when an abnormality occurs during the drying operation, and control the dryer to stop operating according to the abnormality.

5 is a schematic block diagram showing the control configuration of the heat pump of the dryer of the present invention.

As shown in FIG. 5 , the heat pump module 120 includes a heat pump controller 121, a heat pump driver 122, a compressor 50, a valve 59, a cooling fan 58, and a pressure sensor 128. ), a temperature sensor 129, a condenser 52, and an evaporator 53. In addition, the heat pump module 120 further includes an auxiliary heat exchanger.

The heat pump controller 121 controls the compressor 50 to operate according to the control command of the controller 110 . The operating frequency of the compressor of the heat pump controller 121 is set, the compressor is variably controlled according to the data sensed by the pressure sensor 128 and the temperature sensor 129, and the rotational speed of the cooling fan 58 is controlled. .

The heat pump module 120 may detect overcurrent in the heat pump driver 122 for driving the compressor 50 of the heat pump module. In addition, the power supply unit 150 may detect overcurrent of the input power. When overcurrent is detected, the heat pump module 120 or the power supply unit may output an error signal FO for overcurrent. When an error occurs, the heat pump controller 121 applies a control signal for controlling a compressor motor (not shown) provided in the compressor 50 to the heat pump driver 122, and the speed of the compressor motor is reduced.

The heat pump driving unit 122 controls driving so that the compressor 50, the valve 59, and the cooling fan 58 operate. The heat pump driving unit 122 may be separately provided by being divided into a compressor driving unit, a valve driving unit, and a fan driving unit, respectively.

The heat pump driving unit 122 supplies operating power so that the compressor 50 operates according to the setting of the heat pump controller 121 . The heat pump driver 122 may include an inverter (not shown). The heat pump driver 122 controls the opening and closing of the valve 59 that controls the flow of the refrigerant. For example, the heat pump driver 122 controls the four-way valve to change the flow path of the refrigerant, and controls the opening and closing of the valve 59 for the refrigerant discharged from the condenser so that the refrigerant expands and evaporates in the evaporator 53. .

The heat pump driver 122 supplies operating power to the fan motor so that the cooling fan 58 rotates. The cooling fan 58 rotates at a constant rotational speed by driving a fan motor. A cooling fan 58 may be provided in the auxiliary heat exchanger 54 . The auxiliary heat exchanger 54 is composed of a detachable condensing module separated from the condenser 52, and is installed in a refrigerant pipe connected from the condenser to the expansion valve based on the flow direction of the refrigerant to cool the refrigerant discharged from the condenser. . The cooling fan 58 blows air outside or inside the cabinet to the auxiliary heat exchanger to cool the auxiliary heat exchanger.

The refrigerant in the condenser 52 and evaporator 53 exchanges heat with air circulating in the drum. The condenser and the evaporator exchange heat through air circulated by the blowing fan 64 without a separate fan being installed.

The refrigerant flows in the order of the compressor 50, the condenser 52, and the evaporator 53, and the air circulates in the order of the drum, the evaporator, and the condenser. Air may pass through a heater 69 before being supplied to the drum from the condenser.

The compressor 50 discharges high-temperature, high-pressure refrigerant, and the condenser 52 condenses and discharges the refrigerant. At this time, as the refrigerant is condensed in the condenser and dissipates heat, the air passing through the condenser is heated by the heat emitted from the condenser. The compressor 50 includes a compressor motor (not shown).

The refrigerant discharged from the condenser 52 is evaporated in the evaporator by the expansion valve. In the evaporator, since an endothermic reaction of absorbing ambient heat occurs during the evaporation of the refrigerant, the air passing through the evaporator is cooled and the contained moisture is condensed to produce condensed water.

As moisture cooled and moistened in the evaporator 53 is generated as condensate, the air is dehumidified and supplied to the condenser. The air passing through the condenser is heated and supplied to the drum.

6 is a diagram illustrating an operation pattern for detecting the amount of laundry in the dryer according to an embodiment of the present invention.

As shown in FIG. 6 , the controller 110 controls the rotational speed of the motor to determine the amount of laundry.

The controller 110 divides the operation of the dryer into a sensing period for detecting the amount of laundry and a drying period for performing a drying operation for drying the laundry.

The controller 110 detects the amount of laundry by repeating an operation pattern during the sensing period.

The control unit 110 may control the driving unit 60 so that the drum rotates in one direction, then stops, and repeats rotation in the opposite direction after a predetermined period of time. The controller 110 determines the amount of laundry by storing current values measured by the current sensor 135 for each section while the drum rotates.

Hereinafter, the rotation of the drum 30 in one direction for a set period of time will be described as an operation of the drum for sensing the amount of laundry, as one operation pattern.

The controller 110 detects the amount of laundry for the 11th time period (T11). The detection period may be set to the 11th time. When the amount of laundry is detected, the controller 110 controls the driving unit to perform a drying operation in the drying section. The drying period may be set to the twelfth time period (T12), and is the time until the operation of the dryer is terminated.

The controller 110 detects the amount of laundry 5 to 6 times during the 11th time T11.

The control unit 110 controls the driving unit so that the operation pattern is repeated while changing the rotation direction during the eleventh time period T11.

The controller 110 allows the operation pattern to be performed once during the 13th time period (T13), and detects the amount of laundry once during the 13th time period (T13). In the operation pattern for the thirteenth time (T13), the drum rotates 5 to 6 times. Regardless of the rotation direction of forward rotation and reverse rotation, the operation time and detection time are applied the same.

The controller 110 divides and controls the operation pattern into an acceleration section in which the rotational speed increases to a target rotational speed, a maintenance section in which the rotational speed is maintained at the target rotational speed, and a stop section in which the rotational speed is decelerated and stopped.

In the operation pattern performed while detecting the amount of laundry, the rotational speed R1 is set as a target rotational speed at which the laundry is lifted by the rotation of the drum and falls. For example, when measuring the amount of laundry, the rotational speed R1 of the drum may be set to 39 rpm to 63 rpm. The rotation speed of the motor corresponding to the rotation speed of the drum may be set at 2000 prm to 3200 rpm, but may vary depending on the pulley ratio.

In addition, the control unit 110 may control the driving unit 60 so that the drum 30 rotates in one direction, stops, and immediately repeats rotation in the opposite direction.

At this time, as described above, the required time according to the operation pattern of No. 1 is the same as the 13th time (T13), but since it rotates immediately after stopping, the time for detecting the amount of laundry may be shorter than the 11th time (T11).

The control unit 110 controls the driving unit 160 so that the drum 30 rotates reversely, forwardly, reversely, forwardly, and reversely to detect the amount of laundry, and to perform a drying operation while maintaining the forward rotation. After detecting the amount of laundry, the controller 110 performs a set drying operation. At this time, clockwise rotation of the drum is forward rotation, and counterclockwise rotation is reverse rotation.

In addition, when detecting the amount of laundry, the controller 110 may detect the amount of laundry for 6 times starting from normal rotation. For example, the drum 30 may perform forward rotation, reverse rotation, forward rotation, reverse rotation, forward rotation, reverse rotation, forward rotation, and drying operation. It is also possible for the drum 30 to perform a drying operation while rotating in a normal rotation after the drum 30 senses the amount of laundry five times starting from normal rotation.

The controller 110 repeats reverse rotation and forward rotation to detect the amount of laundry 5 to 6 times. In some cases, upon detecting the amount of laundry, the drying operation may be performed after 5 consecutive times in one direction, or the drying operation may be performed twice in one direction, followed by rotation in a different direction, and then rotation in one direction may be repeated. When the amount of laundry is detected, the rotation direction of the drum may be set in various ways, but the controller 110 controls the driving unit to operate the drum 30 according to an operation pattern consisting of an acceleration section, a maintenance section, and a stop section.

As heated air is supplied to the drum when the drum 30 rotates forward, the drum rotates forward during the drying operation. During the drying operation, the drum may reversely rotate a predetermined number of times to prevent the laundry from becoming entangled.

When the drum 30 performs an operation pattern of accelerating, maintaining, and stopping for a set time, the drum rotates 5 to 6 times. During one operation pattern, the controller detects the amount of laundry through the current value sensed by the current sensor 135 . Regardless of the rotation direction of the drum, the control unit distinguishes an acceleration section, a maintenance section, and a stop section at equal time intervals, and detects the amount of laundry through the sensed current value.

The control unit 110 repeats the operation pattern a set number of times while changing the rotation direction of the drum to forward rotation and reverse rotation.

During one operation pattern in which the drum rotates in three sections of acceleration, maintenance, and stop, the control unit 110 divides the current measured by the current sensing unit 135 according to the interval, accumulates and stores the current. The controller 110 determines the amount of laundry by calculating an average of current values in an acceleration section and an average of current values in a sustain section, respectively.

The controller 110 calculates an average for each section of the current value detected in each operation pattern, and determines the amount of laundry based on a value obtained by subtracting the current value in the sustain section from the acceleration section. The controller 110 calculates the amount of laundry by subtracting 1/2 of the average current value of the sustain section from the average current value of the acceleration section.

The controller 110 subtracts 1/2 of the current value (average) of the holding period in order to reduce the error caused by the type of laundry and the frictional force between the drum and the drive belt.

In the case of the average of the current values collected in the acceleration section, the sum of the currents consumed to reach the target rotational speed from the stop state is averaged, and the effect of the current component due to friction acts at 50%. In addition, in the case of the average of the current values in the holding section, the friction coefficient between the drive belt 164 and the drum 30 is 100%, so the effect of the frictional force is 100%.

Accordingly, the control unit 110 subtracts the average of the current values in the sustain section from the average of the current values in the acceleration section in order to remove the effect of the frictional force of the drive belt 164, but removes the effect of the friction force in the acceleration section. 50%, whereas the influence of the frictional force in the holding section is 100%, so the amount of laundry can be determined by subtracting 1/2 of the average current value in the holding section.

Meanwhile, at the twelfth time T12 of the drying section in which the drying operation is performed, the control unit sets the rotational speed of the motor according to the amount of laundry, and the driving unit controls the motor at the set rotational speed so that the drum rotates.

At this time, the rotational speed of the motor may be set at 2000prm to 3200rpm, and may operate at a rotational speed faster than the detection period. Preferably, the rotational speed of the motor in the drying section may be set at 2500 rpm to 3200 rpm.

The control unit classifies the rotational speed of the motor according to the load level for the amount of laundry, and sets the rotational speed of the motor to increase as the amount of laundry increases.

7 is a flowchart illustrating a method for controlling a dryer according to an embodiment of the present invention.

As shown in FIG. 7 , in the dryer 1, laundry is put into the drum 30, and a mode according to the drying operation is set by the control unit 170 (S310). For example, the mode is set by classifying silk, cotton, etc. according to the type of laundry, especially the material.

The controller 110 controls the driving unit 160 to detect the amount of laundry (cloth weight) (S320). When the driving unit 160 rotates the drum according to the control command and the drum rotates according to the pattern, the current sensor 135 measures the current value of the motor.

The control unit 110 may classify and store the current value sensed by the current sensing unit for each section of the acceleration section and the maintenance section, and store each number of times, that is, each pattern.

The controller 110 sets a rotational speed for the drying operation in response to the amount of laundry (S325).

Also, the controller 110 sets a drying time corresponding to the amount of laundry (cloth weight) (S330). The set drying time is displayed on the display of the output unit 175.

The controller 110 divides the measured amount of laundry into a plurality of steps to determine the amount of laundry and sets a preset drying time accordingly.

The driving unit 160 performs a drying operation by driving a motor to rotate the drum and operating a blowing fan according to the control command of the controller (S340).

During the drying operation, the drum repeats that laundry is lifted and dropped by the drum. While the drum rotates, the air circulated by the blower fan 64 is heated by the condenser 52 or heater 69 of the heat pump module 120 and supplied to the drum, and the moisture evaporated from the laundry is included in the air. and is introduced into the evaporator through the circulation passage by the blowing fan. In the evaporator, as the refrigerant and air with a high moisture content mutually exchange heat, the air is cooled, and the moisture contained in the air is condensed to generate condensed water. The dehumidified air enters the condenser, is heated and supplied back to the drum.

The laundry detection unit 132 provided at the inner lower end of the inlet detects the dryness of the laundry in response to the current flowing when the laundry is brought into contact with the two electrodes 18 and inputs a predetermined signal to the controller (S350).

The controller 110 may determine whether the set time has elapsed (S355) and change the setting according to the dryness level in units of the set time.

When the set time has elapsed, the controller 110 determines whether the dryness of the laundry is greater than or equal to the set value, that is, whether the water content of the laundry is less than or equal to a predetermined value (S360).

When the drying time exceeds the set time and the drying level is less than the set value, the controller 110 changes the operation setting (S370) and continues drying (S340). The controller 110 may add a drying time or change a rotational speed of the drum.

When the drying time exceeds the preset time and the drying level exceeds the preset value, the controller 110 maintains the current operating state.

When the drying time is reached (S360), the controller 110 outputs a drying end notification through the output unit 175 (S350). The controller 110 outputs an end notification through a display and also outputs a notification sound according to the completion of drying through a speaker. In some cases, the controller 110 may transmit a notification message to a connected terminal.

8 is a flowchart illustrating a control method according to the amount of laundry in the dryer according to an embodiment of the present invention.

As shown in FIG. 8 , the dryer detects the amount of laundry loaded into the drum (S510).

As described above, the driving unit 160 rotates the drum according to the control command of the control unit, and the drum rotates according to a set pattern. In addition, the air moistened with moisture in the drum by the blowing fan is introduced into the heat pump module through the circulation passage, and the heated air is introduced into the drum again.

At this time, the controller 110 classifies and stores the current value sensed by the current sensor for each section of the acceleration section and the maintenance section, and calculates the amount of laundry in response to the current value (S520).

The controller 110 sets a rotational speed for the drying operation in response to the amount of laundry (cloth weight). Since the drum rotates according to the rotation of the motor, the rotational speed of the drum is determined according to the set rotational speed.

The controller 110 may divide the calculated amount of fabric into a plurality of stages and set rotational speeds for each. For example, the controller 110 may classify the amount of laundry (cloth weight) into a very small amount (A), a small amount (B), a heavy amount (C), and a large amount (D). The classification step for the amount of fabric can be divided into not only 4 steps, but also 3 steps or 5 steps, and also can be divided into various steps depending on the material.

When the amount of laundry is very small (A), the controller 110 may set the speed for the drying operation to the first rotation speed (S530).

When the amount of laundry is small (B), the controller 110 may set the speed for the drying operation to the second rotational speed (S540).

When the amount of laundry is weight (C), the controller 110 may set the speed for the drying operation to the third rotation speed (S550).

When the amount of laundry is large (D), the controller 110 may set the speed for the drying operation to a fourth rotational speed (S560).

After detecting the amount of fabric, the controller 110 performs a drying operation according to the set rotational speed (S570).

The first rotational speed is the lowest rotational speed set according to the amount of fabric, and the fourth rotational speed is the highest speed that can be set. The second rotational speed is faster than the first rotational speed, and the third rotational speed can be set to be faster than the second rotational speed and slower than the fourth rotational speed.

The first to fourth rotational speeds are set within a settable rotational speed range during the drying operation. During the drying operation, the laundry inside the drum is lifted and dropped by the rotation of the drum. Accordingly, the first to fourth rotational speeds may be set within a range of rotational speeds at which the laundry is lifted and dropped by the drum without continuously rotating along the drum.

For example, the rotational speed of the motor is 2000 prm to 3200 rpm. The rotational speed of the drum is set differently according to the pulley ratio of the drum of the motor, for example, the rotational speed of the drum may be set within a range of 39 rpm to 63 rpm.

Accordingly, the controller 110 may set the rotational speed of the motor to 2900 to 3000 rpm when the amount of laundry is very small (A) or small (B), and set to 3000 to 3200 rpm when the amount of laundry is heavy or large.

In some cases, the control unit 110 sets the rotation speed of the motor to 2500 rpm to 2600 rpm in the case of a very small amount (A), 2900 prm to 3000 rpm in the case of a small amount and weight, and 3000 prm to 3200 rpm in the case of a large load.

9 is a flowchart illustrating a control method according to the drying degree of a dryer according to an embodiment of the present invention.

As shown in FIG. 9 , during the drying operation, the laundry detecting unit 132 detects the dryness of the laundry as the electrode contacts the laundry stored in the drum (S580).

The control unit 110 calculates the dryness of the laundry according to the value input from the laundry detection unit 132 (S590). The controller 110 may set a predetermined range for the dryness of the laundry and divide the dryness into a plurality of steps. For example, the control unit 110 classifies the degree of drying into three stages, and determines the degree of drying based on the drying time. That is, the controller 110 sets a criterion for an appropriate dryness level according to the drying time, and determines that the dryness of the laundry is M (Normal) as the second dryness level if the drying time is equal to or greater than the set value. In addition, the controller 110 may determine a first dryness level of over-drying (L) when a lot of drying has been performed, and classify it into a third dryness level of under-drying (N).

Accordingly, the control unit 110, based on the drying time, reduces the rotational speed by one step in the case of overdrying (L) (S600), maintains the rotational speed in the normal state (M) (S620), and In the case of a slow and less dry state (N), the rotation speed may be increased by one step (S640).

In this case, the controller 110 may re-determine the dryness level by re-detecting the dryness level in units of set time. When the set time elapses, the drying time at which the drying operation is performed is longer than the point in time at which the drying level is previously determined, so the control unit determines the drying level again based on the time at which the drying operation is performed. That is, the dryness level determination standard at the time of determining the initial dryness level and the next dryness level determination standard may be different.

For example, a standard for dryness in a state in which drying is performed for 10 minutes and a standard for a dryness in a state in which drying is performed for 20 minutes are applied differently. The control unit classifies the first to third drying degrees based on the time during which the drying operation was performed.

When the blowing fan is connected to the motor, the control unit may vary the amount of air flowing into the drum in response to the rotational speed.

Depending on the case, when the blowing fan operates separately from the drum, the controller 110 may decrease (S610) or maintain (S630) the blowing air according to the dryness level, or increase the blowing (S650).

For example, in the case of overdrying, the rotational speed may be reduced, and in the case of less drying, the rotational speed may be increased and the blowing may be increased. In addition, the controller 110 may maintain the rotational speed and adjust airflow when the rotational speed has already reached the initial value or the maximum value.

The control unit 110 maintains the drying operation while varying the rotational speed according to the drying degree in units of set time (S660).

10 is a flowchart illustrating a method for changing the speed of a dryer according to an embodiment of the present invention.

As shown in FIG. 10 , during the drying operation, the controller 110 detects the dryness level of the laundry in response to the dryness data detected by the laundry detecting unit 132 (S670).

The controller 110 may classify the dryness level into a plurality of stages and set a reference value for them. The controller 110 may set a first set value (X) and a second set value (Y) to classify the dryness level into a plurality of stages. In some cases, the dryness level can be determined in two stages based on one set value.

The controller 110 determines whether the detected dryness level is less than the first set value (X) (S680), and if the dryness level is less than the first set value (X), compared to the drying time, the less dry state (N ) (Under Drying).

At this time, the controller 110 re-determines the drying level based on the drying time during which the drying operation was performed when the dryness level is re-detected in units of set time. That is, the first and second set values at the time of determining the initial dryness level and the first and second set values at the time of determining the next dryness level may be differently applied. The determination of the first to third dryness levels is applied in proportion to the drying time.

The controller 110 determines whether the currently set rotational speed is the maximum rotational speed that can be set (S690).

When the current rotation speed is the maximum rotation speed, that is, when the current rotation speed is the fourth rotation speed, the control unit 110 maintains the current rotation speed (S710), and increases the rotation speed by one step when it is not the maximum rotation speed (S720). For example, in the case of the current second rotational speed, the rotational speed may be increased to the third rotational speed. When the blowing fan is connected to the motor, the blowing also increases as the rotational speed increases, and when the blowing fans operate individually, the controller 110 may set the blowing amount of the blowing fan to increase (S730).

In addition, the controller 110 determines whether or not the amount of laundry is extremely small (A) when the dryness is equal to or greater than the first set value (X) and less than the second set value (Y) and is in a normal state (M) (S740). Do (S750).

When the dryness level is normal and the amount of fabric is very small (A), the control unit 110 reduces the current rotational speed by one step (S760). At this time, the control unit 110 may maintain the rotation speed when the current rotation speed is the lowest speed, and decrease the rotation speed by one step when it is not the lowest rotation speed. For example, in determining the dryness level in units of set time, when the rotational speed increases according to the dryness level after the initial rotational speed is set to the first rotational speed according to the very small amount, the rotational speed is reset again according to the re-detected dryness level. It can be reduced to the first rotational speed.

On the other hand, when the dryness level is normal and the amount of fabric is not extremely small, the controller 110 maintains the current rotational speed (S770). The control unit 110 also maintains ventilation.

When the dryness level exceeds the second set value (Y) and is in the overdry (L) state, the controller 110 reduces the rotational speed by one step (S820). In particular, if the drying degree is overdrying, the load is not large, and the rotation speed is not minimum, drying is possible even if the rotation speed is reduced, so the controller 110 reduces the rotation speed in one step) to save energy can do. For example, in the case of overdrying under a small amount of load, the second rotational speed may be reduced to the first rotational speed.

The control unit 110 may decrease the amount of airflow as the rotational speed decreases, but may maintain the airflow when the ventilation fans operate individually (S830).

Meanwhile, when overdrying and the amount of fabric is large (D) (S810), the control unit 110 maintains the current rotational speed without decreasing the rotational speed (S800). When the amount of laundry is large, drying proceeds more slowly than when the amount of laundry is small at the same rotational speed. Therefore, even in the current overdrying state, the rotational speed is maintained without decreasing under a large load. Blowing is also maintained the same (S830).

However, the control unit 110 may determine the dryness in units of set time, and reduce the rotation speed from the fourth rotation speed to the third rotation speed, which is the first step, when overdrying is detected more than the set number of times under a large load. Blowing may be reduced or maintained corresponding to the rotational speed according to the structure of the blowing fan, and when the blowing fan operates individually, blowing may be maintained (S830).

In addition, when the current rotational speed is minimum (S810), since the rotational speed cannot be reduced any more, the current rotational speed is maintained (S840). When the blowing fan operates individually, the control unit maintains the rotational speed, but may reduce the blowing air (S850).

The controller 110 may perform a drying operation according to the setting changed during the set time (S860), and reset the rotation speed by detecting the dryness again when the set time elapses. As described above, the control unit 110 controls the rotational speed in response to the dryness and the amount of fabric.

Accordingly, according to the present invention, the rotation speed during the drying operation is set according to the amount of fabric, and the rotation speed is changed according to the degree of dryness detected during the drying operation, so that the initially set drying time is not exceeded. In addition, the present invention can prevent waste of energy and prevent damage to laundry in the process of overdrying the laundry by variably controlling the rotational speed in response to the dryness level.

Even though all components constituting an embodiment of the present invention have been described as operating in combination, the present invention is not necessarily limited to these embodiments. Within the scope of the object of the present invention, depending on embodiments, all components may be selectively combined with one or more to operate.

The above description is merely an example of the technical idea of the present invention, and various modifications and variations can be made to those skilled in the art without departing from the essential characteristics of the present invention.

1: dryer 10: cabinet
30: drum 50: compressor
52: condenser 53: evaporator
60, 160: driving unit 64: blowing fan
69: heater
110: control unit 120: heat pump module
121: heat pump control unit 122: heat pump driving unit

Claims (18)

a drum containing laundry;
a motor rotating the drum;
a blowing fan for circulating air passing through the drum;
a drive unit for applying operating power to the motor to operate or stop the motor and to control a rotational speed of the motor;
a heat pump module for removing moisture from the air introduced into the drum and heating the air;
a laundry detecting unit for detecting the dryness of the laundry; and
The rotational speed of the motor for the drying operation is set in response to the detected amount of laundry, and the rotational speed of the motor is changed in response to the dryness level of the laundry detected by the laundry detection unit during drying. A control unit for drying the laundry at a set drying time;
The control unit,
Dividing the dryness level into a plurality of steps, controlling the rotational speed of the motor and the blowing amount of the blower fan in response to the dryness level and the amount of laundry;
When the laundry is overdried to a first dryness level, the rotational speed of the motor is reduced by one step and the blowing amount of the blowing fan is maintained;
When the rotational speed of the motor is detected at the first dryness level in a state where the rotational speed is the lowest, the rotational speed of the motor is maintained and the blowing amount of the blowing fan is reduced,
When the laundry is at a second dryness level in a normal state, the rotational speed of the motor is maintained or decreased according to the amount of laundry while maintaining the air flow rate of the blower fan;
In the case of a third dryness level in which the laundry is less dry, the rotational speed of the motor is increased by one step and the blowing amount of the blowing fan is increased;
When the rotational speed of the motor is the maximum rotational speed and the laundry is detected at the third dryness level, the rotational speed of the motor is maintained and the blowing amount of the blower fan is increased. According to claim 1,
The dryer according to claim 1 , wherein the control unit divides the amount of laundry into a plurality of stages and sets the rotational speed to increase in stages corresponding to the amount of laundry. According to claim 2,
The dryer, characterized in that the driving unit controls the rotational speed of the motor to 2500prm to 3200rpm in response to the control command of the control unit. According to claim 1,
The dryer according to claim 1 , wherein the control unit changes settings to increase, maintain, or decrease the rotational speed of the motor in response to the dryness level and the amount of laundry in units of set time. According to claim 1,
The dryer, characterized in that the control unit determines the drying degree in proportion to the drying time during which the drying operation was performed. According to claim 1,
The control unit classifies the amount of laundry into very small amount, small amount, heavy amount, and large amount, sets the rotational speed of the motor to the first rotational speed in the case of the extremely small amount load, and sets the rotational speed of the motor to the first rotational speed in the case of the small amount load. Set to a second rotational speed faster than 1 rotational speed, set the rotational speed of the motor to a third rotational speed faster than the second rotational speed in the case of a weight load, and set the rotational speed of the motor in the case of a large load Dryer, characterized in that set to the fastest fourth rotational speed. delete delete delete According to claim 1,
The dryer, characterized in that the control unit sets a drying time corresponding to the amount of laundry and outputs it through a display unit. Rotating a drum loaded with laundry to detect the amount of laundry;
setting a rotational speed for a drying operation in response to the amount of laundry;
rotating the drum in response to the set rotational speed and circulating air by a blowing fan to dry the laundry;
detecting a dryness level of the laundry during a drying operation; and
and changing the rotational speed in response to the dryness and the amount of laundry. According to claim 11,
The step of setting the rotational speed,
A method for controlling a dryer, characterized in that the amount of laundry is divided into a plurality of stages, and the rotational speed is set to increase in stages corresponding to the amount of laundry. According to claim 11,
In the setting of the rotational speed, the amount of laundry is classified into a very small amount, a small amount, a heavy amount, and a large amount;
Setting the rotational speed to a first rotational speed in the case of a very small load;
In the case of a small load, setting the rotational speed to a second rotational speed faster than the first rotational speed;
In the case of a weight load, setting the rotation speed to a third rotation speed faster than the second rotation speed; and
In the case of a large load, the control method of the dryer further comprising the step of setting the rotation speed to the fastest fourth rotation speed. delete delete delete According to claim 11,
During the drying operation, a step of re-detecting the drying level in units of a set time is further included,
The control method of the dryer, characterized in that for resetting the rotational speed in response to the re-sensed dryness based on the time when the drying operation was performed. According to claim 11,
The control method of the dryer, characterized in that the rotational speed of the motor for rotating the drum is 2500prm to 3200rpm.

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