JP7030474B2 - Fan - Google Patents

Description

The present invention relates to a fan that blows air toward an object to be dried, such as clothes that have been dried in a room.

Conventionally, there has been a situation in which it is necessary to dry an object to be dried such as laundry indoors, so-called room drying, in all seasons depending on the weather, the season, and the housing environment. When the room is dried in this way, it is required to efficiently dry the laundry in a short time while preventing uneven drying. For example, in the laundry blower / dryer disclosed in Patent Document 1, a fan is installed on the upper part of the laundry to be dried, and the air is blown from the upper part of the laundry to dry the laundry. A dryer has been proposed.

Japanese Unexamined Patent Publication No. 2012-20097

In the configuration disclosed in Patent Document 1, the laundry is not efficiently exposed to the wind depending on the position of the laundry. Therefore, the effect of sufficiently improving the drying efficiency cannot be obtained, and the drying time may be long, which may cause an increase in cost. Further, in order to directly blow the wind on the entire laundry, it is necessary to devise a position for hanging the laundry, which causes a problem that it takes time and effort.

The present invention has been made in view of such circumstances, and the position of an object to be dried such as clothing is specified by using a temperature detecting means such as an infrared sensor, and the object to be dried is directly blown. Therefore, we provide a fan that can efficiently dry the object to be dried at low cost.

In order to solve such a problem, the present invention is provided with a fan main body and a temperature detecting means provided in the fan main body, and is configured to blow air toward an object to be dried based on the temperature detection result of the temperature detecting means. Provide a fan.

The electric fan controls the fan main body to control a blower portion, a swing device for swinging the blower portion, a swing drive unit for driving the swing device, and a swing angle of the blower portion. The temperature detecting means detects the temperature of the object to be dried and its surroundings, the position of the object to be dried is specified based on the detection result of the temperature detecting means, and the identified object to be dried is specified. The control unit determines the swing angle of the blower based on the position of the object, the swing drive unit drives the swing device based on the determined swing angle, and the blower drives the swing device. It may be configured to blow air toward the object to be dried.

The fan blows air from the blower portion to the object to be dried and its surroundings, and based on the temperature change of the object to be dried due to the heat of vaporization generated by the object to be dried, the fan is between the object to be dried and its surroundings. In some cases, the temperature difference is detected and the position of the object to be dried is specified.

The fan may be configured to detect the temperature of the object to be dried and its surroundings by swinging the blower portion by the swing device.

When a plurality of the objects to be dried are detected, the fan may be configured to set the swing angle of the blower portion at an intermediate position between the plurality of objects to be dried.

When a plurality of the objects to be dried are detected, the fan may be configured to swing the blower portion in a range in which the objects to be dried are detected to blow air toward the plurality of objects to be dried. ..

According to the electric fan of the present invention, the temperature detecting means such as an infrared sensor is provided in the electric fan main body, and the air is blown toward the object to be dried based on the detection result of the temperature detecting means. It is possible to efficiently dry the object to be dried at low cost by directly blowing the wind on the object to be dried such as clothing.

It is a perspective photograph figure of the fan main body which concerns on embodiment of this invention. Same as above, it is a front view of the fan body. Same as above, is a right side view of the fan body. Same as above, it is a perspective view of the fan body with the blower directed to the right. Same as above, it is a perspective view of the fan body with the blower facing upward. Same as above, it is a photographic diagram showing a state in which an object to be dried is placed diagonally to the left front of the fan body. Same as above, it is a flowchart explaining the operation of the electric fan main body. Same as above, same as above, is a photograph of the upper surface of the base provided with the operation unit and the display unit. Same as above, it is a figure which shows the detection field of view and division range of an infrared sensor. Same as above, it is a block diagram which shows the structure of an electric fan. Same as above, it is a figure which shows an example of the display screen when a tablet terminal is used as a portable information terminal device.

Hereinafter, preferred embodiments of the electric fan of the present invention will be described with reference to the drawings.

1 to 5 show the appearance of the electric fan main body 1 according to the embodiment of the present invention. In each of these figures, 2 is a base placed on the floor or the like in the room. Reference numeral 3 is a support column that goes upward from the base 2. Reference numeral 4 is a blower unit that sends out wind. An infrared sensor 5 as a temperature detecting means for detecting the temperature of the object to be dried and its surroundings is provided on the front side of the upper surface of the blower unit 4. A swing device 6 for swinging the blower portion 4 in an arbitrary direction is provided between the upper end portion of the support column 3 and the blower portion 4, and the neck is a drive source for driving the swinger. A swing drive unit 27 (see FIG. 10) is provided.

The swing device 6 can be driven by the swing drive unit 27 alone or in combination in the horizontal direction on the left and right and the vertical (elevation) direction on the top and bottom. FIG. 4 shows a state when the blower unit 4 is driven to the right. FIG. 5 shows a state when the blower unit 4 is driven upward. The swing angle of the blower unit 4 is controlled by the control unit 18 (see FIG. 10). The control unit 18 can control the drive direction and drive amount of the blower unit 4 to fix the blower unit 4 at a predetermined swing angle. Two stepping motors, one for left-right drive and the other for up-down drive, can be used for the swing drive unit 27. By giving an appropriate pulse drive signal to the stepping motor from the control unit 18, the swing angle and swing speed of the blower unit 4 can be easily adjusted.

The base 2 is formed on a flat surface whose outer shape is substantially circular in a plan view. On the front upper surface of the base 2, an operation unit 7 with a plurality of keys and buttons and a display unit 8 with a display body such as an LED are provided. On the front side of the side surface of the base 2, a light receiving unit 9 that receives a signal from a remote controller 40 (see FIG. 6) as a remote control body is provided.

The support column 3 constitutes an elevating device that raises and lowers the blower unit 4 including the swing device 6. The support column 3 includes a cylindrical support column base portion 10 extending vertically from the rear upper surface of the base 2, and a sliding rod 11 vertically slidably assembled inside the support column base portion 10. By pushing the lock button 12 provided at the rear of the upper part of the support column base 10 against the urging force of an elastic body (not shown), the engagement between the support column base portion 10 and the sliding rod 11 is released, and the ventilation unit is released. The sliding rod 11 that supports the swinging device 6 and the swinging device 6 slides up and down with respect to the support column base 10.

The blower unit 4 includes a blower drive unit 28, a fan 14 that is rotationally driven by the blower drive unit 28, and a fan guard 15 that is a net-like guard that covers the fan 14. As the blower drive unit 28, for example, a DC (direct current) motor can be adopted. By controlling the duty ratio of the pulse drive signal supplied to the DC motor, the rotation speed of the fan 14 can be arbitrarily changed.

The blower drive portion 28 of the blower portion 4 is covered with a drive portion cover 16 having an open front side. A fan guard 15 is attached to the peripheral edge of the opening of the drive unit cover 16.

The infrared sensor 5 as a temperature detecting means detects the infrared radiant energy emitted by the object at a position away from the object, digitally outputs a thermal image converted into temperature by, for example, a microcomputer with an AD converter, and outputs the thermal image according to the detected temperature. The detection temperature can be displayed in color with the set color. The infrared sensor 5 is provided in the fan main body 1. When the infrared sensor 5 is a one-pixel sensor, the infrared sensor 5 needs to store the detected temperature at a predetermined swing angle while swinging the blower unit 4, so that the blower unit 4 capable of swinging movement can be used. It is preferable to install it. For example, in FIG. 1, it is provided on the front side of the upper surface of the fan guard 15. However, when a multi-pixel infrared array sensor is used, the infrared sensor 5 can be installed on a base 2, a support column 3, or the like. As the infrared sensor 5, for example, a thermopile type infrared sensor that detects the temperature of an object by generating a thermoelectromotive force according to the amount of incident energy when receiving infrared rays emitted from the object can be used. ..

The fan body 1 further includes a wireless communication unit 20 (see FIG. 10) and is connected to the portable information terminal device 41 using a wireless protocol. The portable information terminal device 41, for example, transmits / receives a signal to and from a corresponding WiFi (registered trademark) module (not shown) in the fan main body 1 to display the temperature distribution, air volume, etc. detected by the fan main body 1. Operations such as adjusting the air volume of the fan body 1 can be performed remotely.

The electric fan main body 1, the infrared sensor 5, the remote controller 40, and the portable information terminal device 41 constitute the electric fan according to the present embodiment.

The operation of the electric fan according to the present embodiment having the above configuration will be described with reference to the flowchart shown in FIG.

As shown in FIG. 6, the electric fan main body 1 of the present embodiment is placed so that the object to be dried 17 such as clothes falls within the range of the swinging motion. In the figure, a wet towel as the object to be dried 17 is hung on a hanger at a position diagonally to the left and front of the fan body 1. When the room drying mode is started by operating the room drying button 31 (see FIG. 8) of the operation unit 7 or operating the remote controller 40, the air blowing unit 4 is swung to blow air by the infrared sensor 5. Temperature detection is started (step S1). Hereinafter, the operation of the step S1 is also referred to as “scan”.

As shown in FIG. 9, the infrared sensor 5 detects the temperature of each division range 22 in which the detection field of view 21 is divided into a plurality of ranges. The range of the detection field of view 21 can be arbitrarily set within the range in which the swinging motion of the blower unit 4 is possible. The size of each division range 22 is set so as to be within the viewing angle range of the infrared sensor 5. The number of divisions of the detection field of view 21 is arbitrary, and in FIG. 9, it is divided into 3 in the vertical direction and 9 in the horizontal direction.

In order to detect the temperature of the divided range 22 set in advance, the blower unit 4 stops at a swing angle corresponding to each divided range 22, and detects the temperature by the infrared sensor 5 at each position. The detected temperature is stored in the storage unit 23 together with the position information of the division range 22, and a temperature distribution map is created. The swing angle of the blower unit 4 is controlled based on the drive signal transmitted from the swing control unit 18 to the swing drive unit 27. The order in which each division range 22 is scanned is not particularly limited.

In step S2, the position of the object to be dried 17 is specified based on the detection result of the temperature detecting means 5. Here, the position of the object to be dried is specified by blowing air from the blower unit 4 to the wet object 17 and its surroundings and utilizing the heat of vaporization generated by the object 17 to be dried. When the wet object to be dried 17 is exposed to wind, the water content of the object to be dried 17 is vaporized, so that the temperature of the object to be dried 17 becomes lower than the temperature around it. Based on the temperature change 17 of the object to be dried 17, the temperature difference between the object to be dried 17 and its surroundings is detected by the infrared sensor 5, and the position of the object to be dried 17 is specified.

The temperature display can be displayed, for example, in five stages for each predetermined temperature difference, based on the temperature of the division range 22 having the lowest temperature, for example. Here, it is preferable to specify the division range 22 (a group (lump)) having the lowest temperature as the position of the object to be dried 17. However, the temperature difference between the lowest divided range 22 and the adjacent divided range 22 is as small as one step, and the temperature difference between the adjacent divided range 22 and the adjacent divided range 22 is two or three steps. In the case of a large temperature, a group of division ranges 22 from the lower temperature to the second stage may be specified as the position of the object to be dried 17.

In step S3, the control unit 18 determines the swing angle of the blower unit 4 based on the position of the object to be dried 17 specified in step S2.

When the object to be dried 17 is one, or when the object to be dried 17 is biased to a part of the detection field of view 21, the low temperature division range 22 is one or several division ranges. It is a state in which 22 are gathered together to form a group. When there is only one divided range 22 having a low temperature, the blower portion 4 is directed to the divided range 22, and the swing angle is determined so that the wind directly hits the portion to be dried 17. By directly hitting the portion 17 to be dried by the wind, in one example, the drying time can be shortened to about 2 hours from about 4 hours in normal room drying. When several low-temperature division ranges 22 are gathered together and the low-temperature ranges are grouped together to form a group, the blower portion 4 is directed to one of the low-temperature division ranges 22 to be covered. The swing angle is determined so that the dry matter 17 is exposed to the wind. Alternatively, the swing angle is determined so that the blower portion 4 is directed to the division range 22 having the lowest temperature.

When a plurality of groups of the low temperature division range 22 are detected apart from each other, or when a group of the low temperature division range 22 is detected in a long continuous state in the left-right direction or the vertical direction, the object to be dried 17 is detected. It can be detected that there are multiple. In this case, the swing angle of the blower portion 4 can be set at an intermediate position between the plurality of objects to be dried 17 so that the objects to be dried 17 do not have uneven drying. For example, when two objects to be dried 17 are detected, the blower portion 4 swings to the division range 22 existing at the center position (of a group) of the two division ranges 22 where it can be determined that each object to be dried 17 exists. Set the angle. When there are three or more objects to be dried 17, the swing angle of the blower portion 4 may be set in the division range 22 at the same distance from all the division ranges 22 where it can be determined that the object to be dried 17 is present. When a group of the divided range 22 having a low temperature is detected in a long state in the left-right direction or the vertical direction, the swing angle of the blower portion 4 may be set in the central portion of the group of the divided range 22 having a low temperature.

Similar to the above, when a plurality of objects to be dried 17 are detected, the blower portion 4 can be swung in the range where the objects to be dried 17 are detected to blow air toward the plurality of objects to be dried 17. With such a configuration, it is possible to improve the efficiency of drying by directly blowing wind on each object to be dried 17. In this case, if the upper and lower left and right upper and lower limits of the divided range 22 having a low temperature are set as the upper and lower left and right upper and lower limits of the swing motion, air can be blown toward the object to be dried 17 within a range without waste.

In step S4, the swing device 6 is driven by the swing drive unit 27 based on the swing angle determined in step S3.

In step S5, the blower unit 4 blows air toward the object to be dried 17 at the position of the swing angle moved in step S4. By making the air volume of the blown air weaker than the air volume in step S1, the drying efficiency can be economically increased. In step S5, for example, the wind speed is preferably about 2 m / s.

By periodically checking how much the object to be dried 17 has dried during drying, it is effective because the time until the object to be dried 17 can be predicted and the air volume can be adjusted. In this case, ventilation, swinging, and temperature detection (scanning) can be performed a plurality of times at a predetermined scan interval time.

In step S6 and step S7, it is determined whether to perform the scan again. After the elapse of the preset scan interval time (step S6), if it is preset to perform multiple scans (step S7, Yes), the process proceeds to step S8 to stop the preset ventilation. It is determined whether the time has passed, the temperature of the object to be dried 17 has risen to the ambient temperature, or the temperature has reached a preset temperature. These three conditions may be used alone or in combination of two or three. If "Yes" in step S8, the blast is stopped. If "No" in step S8, the process returns to step S1 to perform scanning again, and "identifying the position of the object to be dried" in step S2, "determining the swing angle" in step S3, and "driving the swing device" in step S4. Then, the "blower" of step S5 is performed.

To determine whether or not the temperature of the object to be dried 17 has risen to the ambient temperature, the temperature of the object to be dried 17 is measured by the infrared sensor 5, and the measured current temperature is stored in the storage unit 23 at the time of scanning in step S1. It can be done by comparing with the ambient temperature. The temperature of the object to be dried 17 may be continuously measured during ventilation, or may be measured at regular time intervals. If the temperature of the object to be dried 17 and the ambient temperature are about the same at the time of the above re-scanning, the blowing may be stopped even if the preset time for stopping the blowing has not elapsed. good.

If it is determined in step S7 that it is not preset to perform multiple scans (No), the process proceeds to step S9, and the time for stopping the preset ventilation has elapsed or the temperature is to be dried. It is determined whether the temperature of the object 17 has risen to the ambient temperature or has reached a preset temperature. These three conditions may be used alone or in combination of two or three, respectively. If "Yes" in step S9, the blast is stopped. If "No" in step S9, the process returns to step S5 to continue blowing air. Whether or not the temperature of the object to be dried 17 has risen to the ambient temperature can be determined in the same manner as described above. If the fan main body 1 does not perform scanning a plurality of times, step S6, step S7, and step S8 can be omitted.

The configuration of the fan main body 1 of the present embodiment will be described with reference to the block diagram shown in FIG.

The control unit 18 provided inside the fan body 1 is based on the operation information of the operation unit 7, the communication information from the remote controller 40 received by the light receiving unit 9, and the communication information from the portable information terminal device 41. Control the operation of 1. The control unit 18 identifies the object to be dried to specify the position of the object to be dried 17 from the storage unit 23 that stores the temperature information measured by the infrared sensor 5 that is the temperature detecting means and the temperature information stored in the storage unit 23. A swing angle determining section 25 that determines the swing angle of the blower section 4 from the position of the section 24 and the specified object 17 to be dried, and an air volume based on the determined swing angle and a predetermined set air volume or air volume adjustment. A swing angle / air volume control unit 26 for controlling is provided.

Inside the fan main body 1, a drive unit 19 controlled by a swing angle / air volume control unit 26 is provided. The drive unit 19 is a drive source for the swing motion of the blower unit 4, a swing drive unit 27 for driving the swing device 6 for swinging the blower unit 4, and a drive source for the rotary motion of the fan 14. , A blower drive unit 28 that drives a blower unit 4 that sends out wind is provided.

Inside the fan body 1, a wireless communication unit 20 such as a WiFi module that performs wireless communication with a portable information terminal device 41 such as a smartphone or tablet terminal is further provided. The wireless communication unit 20 transmits temperature distribution information in the range of the detection field 21 acquired by using the infrared sensor 5 and current air volume information and displays them on the portable information terminal device 41, or from the portable information terminal device 41. It receives the transmitted instruction signal such as air volume adjustment and sends control information to the control unit 18.

On the upper surface of the base 2, a display unit 8 for displaying the operating state of the fan main body 1 by lighting an LED or the like is provided.

FIG. 11 shows an example of the display screen 42 when a tablet terminal is used as the portable information terminal device 41. A temperature distribution display unit 43 is provided in the center of the display screen 42. The temperature distribution display unit 43 displays the temperature of each division range 22 detected by the infrared sensor 5, and in the figure, the range of the detection field of view 21 is divided into 3 rows × 9 columns and displayed. An air volume display unit 44 is provided on the left side of the display screen 42. The air volume display unit 44 can display the air volume during operation. An air volume adjusting button 45 is provided on the right side of the display screen. By operating the air volume adjusting button 45, the strength of the air volume of the air blowing unit 4 can be controlled.

An example of a specific operation of the fan main body 1 will be described.

When the user operates the operation unit 7 or the remote controller 40 to turn on the power of the electric fan main body 1, the display unit 8 displays the power on state. When the user further presses the room drying button 31 provided on the operation unit 7 of the base 2 or the remote controller 40, the room drying mode is started, and the air blower unit 4 is swung toward the object to be dried 17 and its surroundings. And blow air, and start temperature detection by the infrared sensor 5.

The infrared sensor 5 detects the temperature of each division range 22 in which the detection field of view 21 is divided into a plurality of ranges.

In order to detect the temperature of the divided range 22 set in advance, the blower unit 4 stops at the swing angle corresponding to each divided range 22, and detects the temperature of the infrared sensor 5 at each position. The detected temperature is stored in the storage unit 23 together with the position information of the division range 22. The information is transmitted to the portable information terminal device 41, and a temperature distribution map (see FIG. 11) is displayed on the portable information terminal device 41.

As shown in FIG. 11, the temperature of the object to be dried 17 becomes lower than the temperature around the wet object 17 to be dried because the air from the blower portion 4 hits the wet object 17 and the moisture of the object 17 is vaporized. In addition, a group of division ranges 35, 36, 37, 38 having a low temperature is specified as the position of the object to be dried 17.

When the position of the object to be dried 17 is specified, the swing angle of the blower portion 4 is determined so as to blow air toward the position. In FIG. 11, the swing angle is determined at the position of the division range 35. The swing device 6 is driven by the swing drive unit 27 based on the determined swing angle. At the position of the moved swing angle, the blower unit 4 blows air toward the object to be dried 17 (division range 35). The air volume of the blown air may be weaker than the air volume at the time of scanning, and the wind speed may be, for example, about 2 m / s. This air volume can be changed by remote control from the portable information terminal device 41.

If the time to stop the preset blast has passed, the temperature of the object to be dried 17 has risen to the ambient temperature, or the preset temperature has been reached, the blast is stopped and the room drying mode is used. Is finished. The preset time for stopping the ventilation may be determined in consideration of the indoor environment, the amount of the object to be dried 17, and the like, and may be, for example, 2 hours. The preset temperature can be, for example, the same temperature as room temperature. The room temperature can be measured by, for example, a thermometer (not shown) provided in the fan main body 1. The measured room temperature can be displayed on the display unit 8 as shown in FIG. 8, for example.

As described above, in the present embodiment, the electric fan includes the electric fan main body 1 and the temperature detecting means 5 provided in the electric fan main body 1, and is directed toward the object to be dried 17 based on the temperature detection result of the temperature detecting means 5. It is configured to blow air.

In this case, by directly blowing wind on the object to be dried 17 such as clothes based on the detection result of the temperature detecting means 5, the object to be dried 17 can be dried efficiently at low cost.

In the fan of the present embodiment, the fan main body 1 has a blower unit 4, a swing device 6 for swinging the blower unit 4, a swing drive unit 27 for driving the swing device 6, and a neck of the blower unit 4. A control unit 18 for controlling the swing angle is provided, the temperature detecting means 5 detects the temperature of the object to be dried 17 and its surroundings, and the position of the object to be dried 17 is specified based on the detection result of the temperature detecting means 5. The control unit 18 determines the swing angle of the blower unit 4 based on the specified position of the object to be dried 17, and the swing drive unit 27 drives the swing device 6 based on the determined swing angle. In some cases, the blower unit 4 blows air toward the object to be dried 17.

In this case, the temperature detecting means 5 is used to identify the position of the object to be dried 17 such as clothes, and the object to be dried 17 is directly blown by air, so that the drying efficiency of the object to be dried 17 can be achieved with a simple structure at low cost. Can be improved.

The fan of the present embodiment blows air from the blower unit 4 to the object to be dried 17 and its surroundings, and based on the temperature change of the object to be dried 17 due to the heat of vaporization generated in the object to be dried 17, the object to be dried 17 and its surroundings In some cases, the temperature difference between the two is detected and the position of the object to be dried 17 is specified.

In this case, the position of the object to be dried 17 can be reliably specified at low cost.

The fan of the present embodiment may be configured to swing the blower portion 4 by the swing device 6 to detect the temperature of the object to be dried 17 and its surroundings.

In this case, the temperature of each division range 22 can be efficiently detected within the range of the detection field of view 21, and the temperature distribution can be acquired.

When a plurality of objects to be dried 17 are detected, the fan of the present embodiment may be configured to set the swing angle of the blower unit 4 at an intermediate position between the plurality of objects to be dried 17.

In this case, the drying time can be shortened even for a plurality of objects 17 to be dried.

When a plurality of objects to be dried 17 are detected, the fan of the present embodiment is configured to swing the blower portion 4 in the range where the objects to be dried 17 are detected to blow air toward the plurality of objects to be dried 17. In some cases.

In this case, it is possible to suppress the drying unevenness of the plurality of objects to be dried 17 and evenly improve the drying efficiency of all the objects to be dried 1.

Although the present invention has been described above based on the embodiments, the present invention can be modified in various ways. For example, on the display screen 42 of the portable information terminal device 41, the split range 22 to be blown may be arbitrarily selected, the swing angle of the blower unit 4 may be set, and the swing device 6 may be remotely controlled. Further, on the display screen 42 of the portable information terminal device 41, it may be possible to set whether or not to perform scanning a plurality of times and set the scan interval time.

1 Fan body 4 Blower 5 Temperature detection means (infrared sensor)
6 Swing device 17 Dry object 18 Control unit 27 Swing drive unit

Claims (4)

The main body of the electric fan and
It is equipped with a temperature detecting means provided on the fan body.
Based on the temperature detection result of the temperature detecting means, the air is blown toward the object to be dried .
The fan body
Blower and
A swinging device that swings the blower,
A swing drive unit that drives the swing device,
A control unit for controlling the swing angle of the blower unit is provided.
The temperature detecting means detects the temperature of the object to be dried and its surroundings, and
The position of the object to be dried is specified based on the detection result of the temperature detecting means, and the position of the object to be dried is specified.
Based on the specified position of the object to be dried, the control unit determines the swing angle of the blower unit.
The swing device is driven by the swing drive unit based on the determined swing angle.
The structure is such that the blower unit blows air toward the object to be dried.
The temperature difference between the object to be dried and its surroundings is detected based on the temperature change of the object to be dried due to the heat of vaporization generated in the object to be dried by blowing air from the blower unit to the object to be dried and its surroundings. However, the configuration is such that the position of the object to be dried is specified.
The control unit blows the amount of air blown by the blower when specifying the position of the object to be dried, and the amount of air blown toward the object to be dried by the blower after the position of the object to be dried is specified. A fan characterized by being controlled to be stronger than . The fan according to claim 1 , wherein the blower is swung by the swing device to detect the temperature of the object to be dried and its surroundings. The fan according to claim 1 or 2 , wherein when a plurality of the objects to be dried are detected, the swing angle of the blower portion is set at an intermediate position between the plurality of objects to be dried. The present invention is characterized in that when a plurality of the objects to be dried are detected, the blower portion is swung to move the blower portion within the range in which the objects to be dried are detected to blow air toward the plurality of objects to be dried. The electric fan according to any one of 1 to 3 .

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