JP2010233739A - Laundry drying method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laundry drying method which enables an improvement in the drying efficiency and reduces power consumption. <P>SOLUTION: The laundry drying method by a washing/drying machine includes: a step of dewatering the laundry by a controlling section rotating a washing/dewatering tank by controlling a washing/dewatering tank-driving section in a state that hot air is not supplied by a hot air-supplying section; and a step of drying the laundry by the controlling section supplying hot air into the washing/dewatering tank while rotating the washing/dewatering tank by controlling the hot air-supplying section and the washing/dewatering tank-driving section. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a laundry drying method using a laundry dryer for performing laundry from laundry to drying.

  In recent years, various types of washing and drying machines have been proposed that continuously perform from washing to drying. Such a laundry dryer performs a drying process of heating and drying the laundry by supplying warm air to the laundry after performing normal washing, rinsing, and dehydration processes.

JP 2002-360966 A

  In such a washing and drying machine, improvement in drying efficiency and reduction in power consumption are desired.

  The present invention has been made in view of the above-described demand, and an object of the present invention is to provide a laundry drying method capable of improving drying efficiency and reducing power consumption.

  In order to solve the above-described problems, the present invention provides a laundry dewatering tub in which laundry is stored, a laundry dewatering drive unit that rotates the laundry dewatering tub, and a hot air supply unit that supplies warm air into the laundry dewatering tub. And a laundry drying method using a washing and drying machine comprising: a controller for controlling the laundry dewatering tub driving unit and the hot air supply unit, wherein the control unit supplies hot air by the hot air supply unit In a state where the laundry dewatering tub driving unit is controlled, the laundry dewatering tub is rotated to dehydrate the laundry, and the control unit includes the hot air supply unit and the laundry demounting unit. And controlling the water tank driving unit to supply warm air to the laundry dewatering tank while rotating the laundry dewatering tank to dry the laundry.

  In the conventional laundry drying method using a laundry dryer, warm air is supplied in a state where the laundry has a high moisture content to dry the laundry, so the drying efficiency of the laundry is low and excessive. Electricity was consumed. On the other hand, the laundry drying method of the present invention supplies the warm air after the laundry is dehydrated and the degree of dehydration is increased to dry the laundry, thereby improving the drying efficiency and reducing the power consumption. Can be made.

  The hot air supply unit includes a fan that blows air and a PTC heater that warms the air blown by the fan, and the step of drying the laundry includes the step of drying the laundry by the control unit, the fan and the PTC heater. A step of supplying a first hot air by controlling, and a second hot air heated by the control unit more strongly than the first hot air by controlling the fan and the PTC heater. Providing a step.

  Since the PTC heater tends to flow a large current in a low temperature state at the initial stage of driving, in a conventional laundry drying method in which the PTC heater is operated in a strong state from the beginning, a large current flows to prevent a short circuit. A low wattage PTC heater was used. In contrast, the laundry drying method of the present invention first operates the PTC heater in a weak state to supply the first hot air, and then operates in the strong state after the PTC heater has warmed up. Since the second warm air warmed stronger than that is supplied, a high-wattage PTC heater can be used.

  The washing and drying machine further includes a rotating blade provided at a bottom of the washing and dewatering tank, and the washing and dehydrating driving unit rotates the rotating blade and supplies the first strength hot air. The control unit controls the washing / dehydrating drive unit and the hot air supply unit to rotate the rotor blades while the washing / dehydrating tub is stationary while the first dehydrating tub is rotated in the first washing / dehydrating tub. A sub-step of supplying warm air, and the control unit controls the washing / dehydrating drive unit and the warm air supplying unit to rotate the washing / dehydrating tub and the rotating blades integrally with each other. It is desirable to alternately include sub-steps for supplying the first hot air into the tank.

  According to this configuration, it is possible to prevent the laundry from sticking to the laundry dewatering tub and to prevent the laundry from being wrinkled.

  In addition, the washing and drying machine has a ventilation connection part that connects the washing dewatering tub and the hot air supply unit so as to allow ventilation, a drainage connection part that connects the washing and dehydration tub and an external drainage port so as to allow drainage, In the step of drying the laundry, the control unit includes the first temperature sensor provided in the ventilation connection part and the second temperature sensor provided in the drainage connection part. When the difference between the detection result of one temperature sensor and the detection result of the second temperature sensor is equal to or greater than a predetermined value, it is desirable to end the step of drying the laundry.

  According to this configuration, the laundry drying method of the present invention can be suitably terminated by suitably detecting the laundry drying.

  According to the present invention, after the laundry is dehydrated and the degree of dehydration is increased, warm air is supplied to dry the laundry, so that the drying efficiency can be improved and the power consumption can be reduced.

It is an external appearance perspective view which shows the washing-drying machine which concerns on embodiment of this invention. It is a figure which shows the structure of the washing-drying machine which concerns on embodiment of this invention, and is AA line principal part sectional drawing of FIG. It is a block diagram which shows the washing-drying machine which concerns on embodiment of this invention. It is a timing chart for demonstrating the laundry drying method by the washing dryer which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings as appropriate. Similar parts are denoted by the same reference numerals, and redundant description is omitted. FIG. 1 is an external perspective view showing a washing / drying machine according to an embodiment of the present invention. FIG. 2 is a view showing the structure of the washing / drying machine according to the embodiment of the present invention, and is a cross-sectional view taken along line AA of FIG. FIG. 3 is a block diagram showing the washing / drying machine according to the embodiment of the present invention. FIG. 4 is a timing chart for explaining a laundry drying method by the laundry dryer according to the embodiment of the present invention.

<Exterior of washing dryer 1>
As shown in FIG. 1, a washing / drying machine 1 according to an embodiment of the present invention includes a side plate 2a formed of a steel plate, a lower base 2b formed of a synthetic resin, and a top cover 3 formed of a synthetic resin. And a housing 1k composed of As shown in FIG. 2, the top cover 3 has a laundry entry / exit 3a such as clothes in the center, and the laundry dryer 1 has an outside for opening and closing the laundry entry / exit 3a. A lid 4 is provided. In FIG. 2, the closed state of the outer lid body 4 is indicated by a solid line, and the open state of the outer lid body 4 is indicated by a two-dot chain line.

<Top cover 3>
The top cover 3 in which the laundry entry / exit 3a is formed is configured by combining a plurality of members as necessary, and is fitted so as to cover the upper part of the washing / drying machine 1 and is attached to the side frame (not shown) with an attaching screw. )). The laundry entrance 3a formed in the top cover 3 is configured to be openable and closable by an outer lid body 4 rotatably attached to the top cover 3 by a base hinge h1 (see FIG. 2).

  As shown in FIG. 2, a powder detergent charging box 3 d for a user to insert powder detergent is formed on the front edge portion of the top cover 3 on the left side of the contact surface 3 b of the outer lid body 4. The bottom surface of the powder detergent charging box 3d is formed so that the powder detergent charged smoothly flows down to the powder detergent charging port 13. As shown in FIG. 1, a switch mounting surface 3c arranged on the front side of the top cover 3 has a push button type power switch s1 for turning on / off the power and an opening / closing operation for the outer lid body 4. An outer lid opening / closing instruction switch s2 and a detergent amount detection instruction switch s3 are mounted.

<Outer lid 4>
As shown in FIG. 2, the outer lid 4 that opens and closes the laundry entrance 3a is formed of synthetic resin and rotates to the base hinge h1 so that the laundry entrance 3a of the top cover 3 can be opened and closed. A rear lid 4b (see FIG. 1) provided freely (in the directions of arrows α1 and α2 in the figure), and a front lid connected to the front edge of the rear lid 4b in a flexible manner by an intermediate hinge h2 (see FIG. 2). 4a. The opening / closing operation | movement of the laundry entrance / exit 3a by the outer cover body 4 is electrically or manually performed.

  A handle is formed on the front lid portion 4a of the outer lid body 4 shown in FIG. 1 by denting the rear end portion of the front lid portion 4a so that the user inserts a fingertip when the outer lid body 4 is manually opened and closed. A portion 4a2, a handle lid portion 4a1 elastically supported rotatably by a torsion spring or the like so as to close the opening of the handle portion 4a2, and a front side of the handle lid portion 4a1 to operate and display the washing / drying machine 1 And an operation display panel unit 4a3. In FIG. 2, the configurations of the handle lid portion 4a1, the handle portion 4a2, and the operation display panel portion 4a3 are omitted.

  As shown in FIG. 1, the operation display panel 4 a 3 is disposed on the upper surface of the front lid portion 4 a of the outer lid body 4, and the operation button bu operated mainly with the outer lid body 4 closed and the washing / drying machine 1. A display panel P for displaying the operation state is connected to a panel control circuit board (not shown). The panel control circuit board is connected to a main control board, a power control board, etc. (not shown) via a bus line.

<Opening / closing of the outer lid 4>
The electric opening / closing drive mechanism that electrically opens and closes the outer lid body 4 shown in FIG. 1 drives the rear lid portion 4b with an opening / closing drive motor using the base hinge h1 (see FIG. 2) as a fulcrum (see FIG. 1). 2 (see arrows α1 and α2 in FIG. 2), and the front lid portion 4a is driven around the intermediate hinge h2 (see FIG. 2), and the front lid portion 4a and the rear lid portion 4b are folded (two points in FIG. 2). Opening and closing operations are performed in a closed state (see a solid line in FIG. 2) in which the front lid portion 4a and the rear lid portion 4b are spread and flattened.

  Alternatively, instead of this configuration, the rear lid portion 4b and the front lid portion 4a are opened and closed by being bent and extended by an open / close drive motor so as to be in an open / closed state at the position of the intermediate hinge h2 (see FIG. 2). You may comprise as follows. For the opening / closing control of the outer lid body 4, an outer lid full-opening detection sensor and an outer lid full-closing detection sensor (not shown) for detecting the full-open / full-closed state of the outer lid body 4 are provided. Yes.

  On the other hand, when the user manually opens and closes the outer lid body 4, when the user presses the handle lid portion 4a1 with the fingertip, the handle lid portion 4a1 rolls backward to insert the fingertip into the handle portion 4a2. Then, by grasping the handle portion 4 a 2 and raising and lowering the front lid portion 4 a of the outer lid body 4, the outer lid body 4 is opened and closed. The electric opening / closing drive mechanism that opens and closes the outer lid body 4 takes into account the form of the opening / closing drive motor so as not to cause a large mechanical load resistance when the user manually operates the outer lid body 4 to open / close. It is desirable to interpose a clutch mechanism in the transmission system.

<Outer tank 5>
As shown in FIG. 2, in the case 1 k of the washing / drying machine 1, four outer tanks 5 for storing washing water are engaged with and suspended from the corner plates provided at the four upper corners of the case 1 k. It is supported by a suspension member (not shown), and is arranged vertically in the center of the washer / dryer 1. The suspension member includes an anti-vibration mechanism having an elastic material such as a spring and a damping mechanism due to the viscosity of a fluid such as air. The outer tub 5 is supported in an anti-vibration manner through this anti-vibration mechanism, and the whirling motion at the start of the dehydration operation is suppressed.

  The outer tub 5 is formed of a synthetic resin in a bottomed cylindrical shape that is long in the axial direction. The outer tub 5 is formed with an air trap 5a for water level detection on the lower side wall thereof, and is connected to a pressure-sensitive water level detection sensor c2 which is a water level detection means via an air tube c1, and has a drainage and drainage at the bottom. An exhaust port 5b is provided. A washing / dehydrating drive device 10 is attached to the outside of the bottom of the outer tub 5 via a steel plate attachment base 18. In the outer tub 5, a laundry 19 such as clothes is placed, and an inner tub 6 in which washing, rinsing, dehydration, and drying are performed is concentrically provided rotatably.

<Outer tank upper cover 9>
As shown in FIG. 2, the upper opening end of the outer tub 5 in which the inner tub 6 is accommodated has an inner garment inlet 9 a on the outer tub so as to cover the gap between the outer tub 5 and the inner tub 6. A cover 9 is attached. The inner garment insertion port 9a of the outer tub upper cover 9 is covered with an unillustrated inner lid so as to be freely opened and closed, but the explanation of the inner lid is omitted here.

  The outer tub upper cover 9 has water spouts 11 for spraying water circulated into the inner tub 6 that is opened toward the inner tub 6 and circulated during the washing process, and drying air into the inner tub 6 during the drying process. A jet port 12 for jetting is attached. Moreover, the detergent inlet 13 and the water supply port 14 are attached to the outer tank upper cover 9 so as to open toward the gap between the inner tank 6 and the outer tank 5. The detergent charging port 13 is connected to the powder detergent charging box 3d through the bellows tube j1.

<Inner tank 6>
The inner tub 6 disposed in the outer tub 5 is a washing and dewatering tub, and is formed in a bottomed cylindrical shape that is long in the axial direction using a stainless steel plate. A small hole 6a for water flow and ventilation is formed in the peripheral wall of the inner tub 6, and the fluid for balancing moves to the upper edge of the small hole 6a in the direction opposite to the bias of the laundry 19 during the high-speed rotation dehydration process. A fluid balancer 6b that suppresses vibration due to the bias of the laundry 19 is provided. The inner tub 6 rotates at a high speed during the dehydration process, and centrifugal dehydration is performed in which moisture contained in the laundry 19 is separated from the laundry 19 by centrifugal force and discharged from the dewatering holes.

  In the center of the inner bottom surface portion in the inner tub 6, a rotary blade 30 is provided rotatably for washing, rinsing and the like by moving the laundry 19 up and down and stirring. The rotary blade 30 is rotationally driven by the washing / dehydrating drive device 10, and performs washing, rinsing, and the like by repeating forward / reverse rotation. In the drying operation, the rotor blade 30 is dried by repeating forward / reverse rotation.

<Laundry dehydration drive device 10>
The washing / dehydrating drive device 10 has a built-in drive motor, an electromagnetically operated clutch mechanism, and a planetary gear reduction mechanism using a reversible rotation type capacitor phase-separated single-phase induction motor, an inverter-driven motor, and the like. By controlling, the stirring drive mode in which the rotor blade 30 is repeatedly rotated in the forward and reverse (reciprocating) directions while the inner tank 6 is stationary, and the dehydration drive mode in which the inner tank 6 and the rotor blade 30 are integrally rotated in the same direction. And a drive function for selectively executing.

<Washing water circulation during the washing process>
Next, a configuration will be described in which washing water is discharged from the inner tub 6 and supplied and circulated again during the washing process. The drainage / exhaust port 5b of the outer tub 5 shown in FIG. 2 is connected to the water inlet of the drainage electromagnetic valve 16 and the water inlet of the electric circulation pump P1 via the bellows pipe j2 and the internal pipe k1. The drain electromagnetic valve 16 and the electric circulation pump P1 are attached to a strength member (not shown) in the housing 1k, and the water outlet of the drain electromagnetic valve 16 is connected to an external drain hose 17. The water outlet of the electric circulation pump P1 is connected to the water spout 11 via an internal pipe k3 in which the internal pipe k2, the bellows pipe j3, and the lint filter f1 are detachably installed.

The drainage / exhaust port 5b, the bellows pipe j2, the internal pipe k1, the electric circulation pump P1, the internal pipes k2, k3, the bellows pipe j3, and the water spout 11 constitute a washing water circulation mechanism.
In the washing process in which the washing water is circulated, in addition to the washing water contained in the laundry 19, a minimum water level (a water level having a height of 1/2 from the inner bottom surface of the inner tub 6 from the extent that the rotary blade 30 sinks). ) Washing water is applied and washing is performed.

<Configuration of drying mechanism>
A water-cooled dehumidifying mechanism 20 for dehumidifying the air containing moisture absorbed from the laundry 19 in the drying process with the cooling water flowing on the outer surface of the water-cooled dehumidifying plate 22 is dehumidified on the rear side of the housing 1k. is set up. The basic structure of the water-cooled dehumidifying mechanism 20 is to suck out the humid air in the outer tub 5 in the drying process from the drainage / exhaust port 5b, and to cool and dehumidify with cooling water flowing on the outer surface of the water-cooled dehumidifying plate 22 to reduce the absolute humidity. It heats after making it fall, and comprises the dry air circulation system which blows in into the inner tank 6 from the upper direction.

  The water-cooled dehumidifying mechanism 20 includes a water-cooled dehumidifying air passage 21 that is an air passage for drying air connected from the drainage / exhaust port 5b through the bellows tube j4. A water-cooled dehumidifying plate 22 is installed in the water-cooled dehumidifying air passage 21, and a yarn waste filter f2 for removing yarn waste contained in the drying air, an electric blower 23 for blowing the drying air, and after dehumidification And an electric heater Hp for heating the drying air.

  Specifically, the water-cooled dehumidifying air passage 21 is provided with a rising air passage 21a extending upward from the bellows tube j4 with the drainage / exhaust port 5b as an inlet, and the water-cooling dehumidifying plate 22 is provided in the rising air passage 21a. Is installed. Then, a descending air passage (not shown) that is folded back from the upper end portion of the ascending air passage 21a and extends downward is provided, and the lint filter f2 is detachably installed in the folded portion. A humidity sensor (not shown) that is sensitive to the humidity of the air flowing through the descending air path is installed in the descending air path. An intake port of the electric blower 23 is connected to a lower end portion of the descending air passage, and an ascending air passage (not shown) extending upward from the exhaust port of the electric blower 23 is provided. The tip of the ascending air path is connected to the above-described blast port 12 through the air heating tube k4 and the bellows tube j5. In the air heating tube k4, an electric heater Hp such as a PTC (Positive Temperature Coefficient) heater for heating circulating air for drying in the drying process is provided.

  The washer / dryer 1 further includes a first temperature sensor 41 and a second temperature sensor 42. The first temperature sensor 41 is provided in the ventilation connection portion that connects the inner tub 6 and the electric heater Hp so as to be permeable, in the present embodiment, in the water-cooled dehumidification air passage 21, and the air discharged from the inner tub 6. Detect the temperature. The second temperature sensor 42 is provided in the drainage connection portion that connects the inner tub 6 and the external drainage port so as to allow drainage, in this embodiment, the external drainage hose 17, and the drainage of the drainage discharged from the inner tub 6. Detect temperature.

  As shown in FIG. 3, the washing / drying machine 1 includes a control unit 50 including the above-described panel control circuit board, main control board, power control board, and the like. The control unit 50 includes a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read-Only Memory), an input / output circuit, and the like, and opens and closes the power switch s1 and the outer lid body 4. Input / output signals based on user operations such as an operation button bu of the operation display panel unit 4a3, and detection of the first temperature sensor 41, the second temperature sensor 42, etc. Based on the results, the driving of the outer lid 4, the washing / dehydrating drive device 10, the drainage electromagnetic valve 16, the electric blower 23, the electric circulation pump P1, the electric heater Hp, the display panel P, and the like is controlled.

<Laundry drying method>
Then, the laundry drying method by the laundry dryer 1 is demonstrated with reference to FIG. This laundry drying method is a method applied to the laundry 19 in which a normal washing course (washing → rinsing → dehydration) by the washing / drying machine 1 is performed, and is based on the operation of the operation button bu by the user. In addition, it may be applied continuously after the end of the normal washing course, or may be applied to clothes that need to be dried separately from the washing course.

  First, the control unit 50 opens the drain electromagnetic valve 16 and controls the washing / dehydrating drive device 10 to rotate the inner tub 6 and the rotary blade 30 integrally in the same direction (dehydrating step). In the dehydration step, the electric blower 23 and the electric heater Hp are in an OFF state, and the laundry 19 accommodated in the inner tub 6 is dehydrated by the centrifugal force applied by the inner tub 6 and the rotary blades 30.

Subsequently, after a predetermined time has elapsed from the start of the dehydration step (time t ₁ ), the control unit 50 turns on the electric blower 23, turns the electric heater Hp into a weak state, and supplies the first hot air to the inner tank 6. (Preliminary drying step). In the preliminary drying step and the main drying step described later, the control unit 50 raises the water-cooled dehumidifying air passage 21 by opening a solenoid valve (not shown) and supplying water (for example, tap water) to the water-cooled dehumidifying plate 21. Cools the air and removes moisture contained in the air. This electromagnetic valve is a normally closed valve provided in a water channel that supplies water (for example, tap water) to the water-cooled dehumidifying air channel 21 and is opened at the start of the preliminary drying step.

Here, at time t _{1 to} t ₂ and t _{3 to} t ₄ , the control unit 50 drives and controls the washing / dehydrating drive device 10 to rotate the rotor blade 30 in the forward and reverse directions while the inner tub 6 is stationary. Let The control unit 50 at time _{t 2 ~t 3, t 4 ~t} 5, by controlling the driving of the washing dewatering driving device 10, the inner tub 6 and the rotary vanes 30 rotate integrally. To rotate only the rotating blade 30 forward and backward at times t _{1 to} t ₂ and t _{3 to} t ₄ prevents the laundry 19 from sticking to the inner tub 6, and further prevents the laundry 19 from wrinkling. This is to prevent it.

Subsequently, after a predetermined time has elapsed from the start of the preliminary drying step (time t ₅ ), the control unit 50 sets the electric heater Hp to a strong state and supplies the second hot air heated from the first hot air to the inner tank. 6 (main drying step). In the main drying step, the control unit 50 drives and controls the washing / dehydrating drive device 10 to rotate the inner tub 6 and the rotary blade 30 integrally.

Subsequently, the control unit 50 dries the laundry 19 when the difference between the detection result of the first temperature sensor 41 and the detection result of the second temperature sensor 42 is equal to or greater than a predetermined value (time t ₆ ). And the electromagnetic valve provided in the water channel for supplying water (for example, tap water) to the water-cooled dehumidifying air channel 21 is closed, and the electric blower 23, the electric heater Hp, the inner tank 6, and the rotation are closed. The driving of the wing 30 is stopped. When the difference between the detection result of the first temperature sensor 41 (the temperature of the air discharged from the inner tub 6) and the detection result of the second temperature sensor 42 (the temperature of the waste water) is a predetermined value or more, This is a case where the laundry 10 is sufficiently dried and the temperature of the air discharged from the inner tub 6 becomes high. The predetermined value is determined in advance by experiments or the like and stored in the control unit 50. In the preliminary drying step, the control unit 50 also dries the laundry 19 when the difference between the detection result of the first temperature sensor 41 and the detection result of the second temperature sensor 42 is equal to or greater than a predetermined value. The step of performing is finished.

  According to the laundry drying method by the drying washing machine 1 described above, since the laundry 19 is dehydrated and the laundry 19 is dried by supplying warm air after the degree of dehydration is increased, the drying efficiency is improved, and Power consumption can be reduced. First, the electric heater Hp, which is a PTC heater, is operated in a weak state to supply the first hot air, and after the electric heater Hp is warmed, the electric heater Hp is operated in a strong state to be warmed stronger than the first hot air. Since the second warm air is supplied, a high wattage PTC heater can be used as the electric heater Hp. Further, by using the detection results of the first temperature sensor 41 and the second temperature sensor 42, it is possible to suitably detect the drying of the laundry 19 and suitably terminate the laundry drying method of the present invention.

  As mentioned above, although embodiment of this invention was described with reference to drawings suitably, this invention is not limited to the said embodiment, A design change is possible suitably in the range which does not deviate from the summary of this invention. For example, the electric heater Hp may be a heater other than the PTC heater. In this case, the electric heater Hp can be driven in a strong state even in the preliminary drying step. Moreover, the structure which starts the detection by the 1st temperature sensor 41 and the 2nd temperature sensor 42 after predetermined time progress after starting this drying step may be sufficient.

1 Washing and drying machine 6 Inner tank (washing and drying tank)
10 Laundry dehydration drive unit (Laundry dehydration drive unit)
23 Electric blower (fan, hot air supply unit)
30 Rotating Blade 41 First Temperature Sensor 42 Second Temperature Sensor 50 Control Unit Hp Electric Heater (PTC Heater, Hot Air Supply Unit)

Claims (4)

A laundry dewatering tank in which laundry is stored;
A washing / dehydrating drive unit for rotating the washing / dehydrating tank;
A warm air supply unit for supplying warm air into the washing and dewatering tank;
A control unit for controlling the washing and dewatering tub driving unit and the hot air supply unit;
A laundry drying method using a laundry dryer comprising:
The controller is configured to dehydrate the laundry by rotating the laundry dewatering tub by controlling the laundry dewatering tub driving unit in a state where the hot air is not supplied by the hot air supply unit; ,
The controller controls the hot air supply unit and the washing / dehydrating tub driving unit to supply hot air into the washing / dehydrating tub while rotating the washing / dehydrating tub to dry the laundry. Steps,
A method for drying laundry, comprising: The warm air supply unit
A fan that blows air,
A PTC heater for warming air blown by the fan;
With
The step of drying the laundry includes
A sub-step in which the control unit supplies the first hot air by controlling the fan and the PTC heater;
A sub-step for supplying a second hot air heated stronger than the first hot air by the control unit controlling the fan and the PTC heater;
The laundry drying method according to claim 1, further comprising: The washing and drying machine further includes a rotary blade provided at the bottom of the washing and dewatering tank,
The washing and dehydrating drive unit rotates the rotary blade,
Supplying the warm air of the first strength,
The control unit controls the washing / dehydrating drive unit and the warm air supply unit to rotate the rotor blades while the washing / dehydrating tub is stationary, while rotating the rotor blades in the washing / dehydrating tub. Supplying wind,
The control unit controls the washing / dehydrating drive unit and the hot air supply unit to rotate the washing / dehydrating tub and the rotary blade integrally while the first hot air is supplied into the washing / dehydrating tub. Supplying step;
The laundry drying method according to claim 2, wherein the laundry drying method is alternately included. The washing dryer is
A ventilation connection part for connecting the washing and dewatering tub and the hot air supply part in a breathable manner;
A drainage connection part for connecting the washing dewatering tank and the external drainage port so as to allow drainage,
A first temperature sensor provided in the vent connection;
A second temperature sensor provided at the drainage connection,
With
In the step of drying the laundry, when the difference between the detection result of the first temperature sensor and the detection result of the second temperature sensor is equal to or greater than a predetermined value, the control unit The method for drying laundry according to any one of claims 1 to 3, wherein the step of drying is finished.

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