WO2013021690A1

WO2013021690A1 - Portable fan

Info

Publication number: WO2013021690A1
Application number: PCT/JP2012/060405
Authority: WO
Inventors: 幸大栗原; 佳史山本
Original assignee: シャープ株式会社
Priority date: 2011-08-09
Filing date: 2012-04-18
Publication date: 2013-02-14
Also published as: JP5566347B2; JP2013036413A; CN202648042U

Abstract

A portable fan that is capable of improving safety is provided. A blower fan is covered with a case, and an air intake for drawing in air, and an air outlet for blowing the air out are provided to the case. The portable fan is configured such that the air outlet is positioned so as to be biased toward the front side of the case, enabling a distance to be kept from the rear, which serves as the installation surface.

Description

Portable blower

The present invention relates to a portable blower provided with a blower fan in a portable casing.

A conventional portable blower is disclosed in Patent Document 1. In this portable blower, a suction port is opened on the back surface of a portable thin box-shaped housing, and an air outlet is opened on the front surface. An air passage that connects the suction port and the air outlet is provided in the housing, and a blower fan including an axial fan is disposed in the air passage. Further, a rotatable stand is provided on the side surface of the housing. When the stand is rotated and brought into contact with the installation surface of the table, the case can be set up on the table by supporting the stand.

When the blower fan is driven in a state where the casing stands on the installation surface of the table by the stand, outside air flows into the air passage from the suction port. At this time, the rear surface of the casing is inclined to face the installation surface, and an air flow is sent obliquely upward from the front outlet toward the user's head and the like. Thereby, coolness can be obtained easily outdoors and indoors.

JP 2008-57519 A

However, according to the conventional portable blower described above, since the blower fan is exposed, foreign matter enters the rotating part, which is dangerous for the user and may damage the device. In addition, there is no problem when it is installed on a table, but there is a problem that if it is hung from the neck, the inlet or outlet of the blower is blocked. Furthermore, since the blower fan can be seen directly from the outside, there is a problem that it is not beautiful in appearance.

In order to solve the above-mentioned problems, a portable blower of the present invention includes a blower fan, a flat housing that houses the blower fan, a suction port that is formed in the housing, and the blower fan sucks in air, and In the portable air blower having an air outlet for blowing out the sucked air, the air inlet and the air outlet are formed on a peripheral side surface of the housing, and are respectively located on both front and rear sides in the air blowing direction of the air blowing fan. It is characterized by.

The portable air blower according to the present invention is characterized in that the air outlet is unevenly distributed on one surface side of the housing.

In the portable air blower of the present invention, an attachment portion for attaching a strap for carrying the portable air blower is provided on a peripheral side surface where the air outlet is located, and the attachment portion is located in the housing more than the air outlet. It is close to the other side of the body.

The portable air blower of the present invention is characterized in that the suction port is formed at a position closer to the other surface side than the one surface side of the casing.

The portable air blower according to the present invention is characterized in that a recess is formed on a peripheral side surface of the housing where the suction port is located, and the suction port is opened in the recess. .

The portable air blower according to the present invention is characterized in that the casing is formed with a curved surface on one side and / or the other side.

The portable air blower of the present invention is characterized in that the casing has a thickness at the center portion larger than a thickness at the edge portion.

In the portable air blower according to the present invention, the suction port and the air outlet are formed on the peripheral side surface of the housing, and are located on both the front and rear sides in the air blowing direction of the blower fan. Since the blower fan is not directly visible from the outside, it can be made beautiful in appearance. Moreover, in order to ensure ventilation performance, the suction port was provided in the recessed part of the housing so that it was not blocked by clothes. Similarly, the air outlet was devised so as not to be blocked by being formed on the surface opposite to the surface in contact with the person.

Here, the casing can be configured to have a smooth curved appearance, generally a rectangular parallelepiped, a suction port at the lower part of the main body that is not directly visible from the outside, and a blower outlet at the upper surface of the main body. Thereby, it can be made beautiful in appearance.

According to the present invention, since the positions of the suction port and the air outlet are not affected by the form of use, the air blowing performance can be sufficiently exerted both when used on a desktop and when suspended from the neck.

Also, the appearance is covered with a case with a smooth curve, and the blower fan is housed inside, so the appearance is beautiful.

The external view which looked at the portable air blower of this invention from the front. The external view which looked at the portable air blower of this invention from the back. The external view which looked at the portable air blower of this invention from the upper surface. The structure figure which removed the lid | cover, ion generator, and battery of the back surface of the portable air blower of this invention. The structure figure which removed the front case, the ventilation fan, and the partition panel of the portable air blower of this invention. Sectional drawing which shows the internal structure of the portable air blower of this invention cut | disconnected by centerline AA of FIG. The external appearance schematic diagram of the ion generator used for this invention. The external appearance schematic diagram of the battery used for this invention. The external appearance schematic diagram of the ventilation fan used for this invention. The external appearance schematic diagram of the control board of this invention. The external appearance schematic diagram of the partition panel of this invention. The schematic diagram which shows the use condition of the portable air blower of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is an external view of a portable blower 1 according to the present invention as seen from the front. The portable blower 1 includes a flat housing 2 that houses a blower fan 17 (see FIG. 6) described later. On the peripheral side surface of the housing 2, a suction port 6 through which the blower fan 17 sucks air and a blower port 7 through which the sucked air is blown out are formed. As an example, the housing 2 is formed in a portable size of about 100 mm in length, 80 mm in width, and 30 mm in thickness, and has a thin box shape with a substantially rectangular front view. In FIG. 1, the air outlet 7, which will be described in detail later, is provided at the upper end portion of the housing 2, and the suction port 6 is hidden at the lower end portion in the state of FIG. 1. As shown in FIG. 2, the suction port 6 is provided in the lower part on the back side.

In addition, the display unit 4 is provided on the front case 2a constituting the housing 2. The display unit 4 displays operation information of the portable blower 1 using a display unit such as an LED. It is also preferable to display the operation status of the apparatus, the operation time, the accumulated operation time, and the remaining battery level using display means such as LED or liquid crystal.

Next, FIG. 2 is an external view of the portable air blower 1 of the present invention as seen from the back, showing a state in which the legs 3 are closed. The rear case 2b facing the front case 2a constitutes a housing 2 that forms an exterior part by fitting with the front case 2a. There is a lid 2g at the center of the back case 2b, and the lid 2g is removed from the back case 2b to cover the built-in ion generator 18 and battery 19 (see FIG. 6) in a replaceable manner.

The leg 3 is a substantially U-shaped bar member pivotally supported on both side surfaces of the housing 2 at the center of the main body with the direction connecting the air outlet 7 and the suction port 6 as the longitudinal direction. A storage portion 2f formed as a groove-shaped recess is provided in 2b for storage. The leg 3 is stored in the lower part in the vertical direction when not in use. By providing the pivot shafts of the legs 3 at substantially the center left and right in the vertical direction of the housing 2, the legs 3 can be rotated at an angle of less than 180 ° when viewed from the stored state. The legs 3 can be held at a plurality of opening angles, and the portable air blower 1 can be installed by standing the casing 2 on the installation surface of the table by supporting the legs 3 with the legs 3 open. it can. Therefore, the leg 3 constitutes a support portion that supports the housing 2 when the portable air blower 1 is installed on the installation surface of the tabletop.

At the lower end of the housing 2 and at the lower end of the back case 2b, a storage portion 2f is continuous in the width direction of the back case 2b, and an outside air suction port 6 is formed so as to be integrated with the storage portion 2f. . A net is attached to the suction port 6 to prevent dust from being sucked. The suction port 6 is always visible from the outside on the back case 2b side when the leg 3 is opened and stored, and can suck in the outside air without being affected by the opening and closing of the leg 3.

The front case 2a and the back case 2b constituting the housing 2 are formed with curved surfaces in the vertical direction and the left-right direction, and a curved surface having a large radius is given to a portion corresponding to a ridge line of a normal housing. Therefore, the portable air blower 1 does not have a clear ridge line unlike a normal cuboid casing. With this configuration, the housing 2 has a shape in which the thickness direction of the center portion is greatly expanded.

FIG. 3 is an external view of the portable air blower 1 of the present invention as viewed from above, and an air outlet 7 is opened on the upper surface of the external part formed by the front case 2a and the back case 2b. The opening is provided with a blowing grid 2d, and the center of the outlet 7 which is the opening is formed so as to be largely deviated toward the front case 2a. The front case 2a and the back case 2b are aligned at the center line in the thickness direction of the housing 2, and each bulge height is about 15 mm as an example. Therefore, the center of the blower outlet 7 is on the front side of the center line in the thickness direction.

The casing 2 is formed with a curved surface having a large radius, and the outlet 7 is biased toward the front case 2a, so that the portable blower 1 can be placed on a table without using the legs 3 described later. When placed directly on the head or suspended from the neck, a distance L (see FIG. 12) is ensured between the contact surface with the table or the human body and the center of the air outlet 7, and air flow is good. To be made.

In FIG. 1, a power switch 5 is provided on a side cover 2 c on the right side of the portable blower 1. When the power switch 5 is set to the [ON] position, the blower fan 17 and the ion generator 18 are energized to start operation. The display unit 4 displays driving information and driving information such as the ion generation status of the ion generator 18 and the remaining battery level status of the battery 19.

FIG. 4 is a structural diagram in which the back cover 2g, the ion generator 18 and the battery 19 are removed from the portable blower 1 of the present invention. The back case 2b is provided with a lid 2g so as to be detachable, and the interior corresponding to the lid 2g is recessed to the front case 2a side, and an isolation chamber 22b for storing the ion generator 18 near the blowout port 7, Next to this, an isolation chamber 22c for storing the battery 19 is formed.

Holes

221a and 221b for discharging the ions generated by the ion generator 18 are provided in the bottom wall of the rear case 2b of the isolation chamber 22b that houses the ion generator 18. The ion generator 18 is fitted in the

ion discharge holes

221a and 221b so as to correspond to the

ion discharge portions

18a and 18b of the ion generator 18 shown in FIG. The bottom wall of the rear case 2b of the isolation chamber 22b constitutes a part of the air passage 8 described later.

In the

isolation chambers

22b and 22c, the respective terminal portions 15a are exposed, and the terminal 18d of the ion generator 18 shown in FIG. 7 contacts the terminal portion 15a exposed to the isolation chamber 22b side. Further, the terminal 19b on the side of the main body 19a of the battery 19 shown in FIG. 8 contacts the terminal 15a exposed in the isolation chamber 22c and supplies power to the control board 15 (see FIG. 6).

FIG. 5 is a structural view in which the front case 2a, the blower fan 17, and the partition panel 22 (shown in FIG. 6) of the portable blower 1 of the present invention are removed. Three plate-shaped airflow guides 221c are installed on the bottom wall of the isolation chamber 22b provided in the back case 2b on the surface on the air passage 8 side toward the inside of the housing 2. This airflow guide 221c has an effect of correcting that the airflow (see FIG. 6) sent out as shown by the arrow A2 is biased in the upper right direction of the page because the blower fan 17 is a turbo fan. The inclination of the airflow guide 221c intersects the airflow sending direction. In FIG. 5, a shutter 7 a is shown inside the air outlet 7. The shutter 7 a opens and closes the air outlet 7 in conjunction with the power switch 5.

FIG. 6 is a cross-sectional view showing the internal structure of the portable blower 1 of the present invention cut along the center line AA of FIG. As shown in FIG. 6, the suction port 6 and the blowout port 7 are located on both front and rear sides of the blower fan 17 in the blowing direction. A control board 15 on which the control circuit of the portable blower 1 is mounted is attached to the inside of the

isolation chambers

22b and 22c provided in the back case 2b. As shown in FIG. 4, each of the

isolation chambers

22 b and 22 c is provided with a notch, and a terminal portion 15 a provided on the control board 15 is fitted into each notch. Two terminal portions 15 a are installed in the isolation chamber 22 b for storing the ion generator 18, and one terminal portion 15 a is installed in the isolation chamber 22 c for storing the battery 19. The ion generator 18 and the battery 19 housed in the

isolation chambers

22b and 22c, respectively, are connected to the control board 15 via the terminal portion 15a. A schematic external view of the control board 15 of the present invention is shown in FIG. Components are mounted on both sides of the control board 15, and a terminal portion 15a is mounted on the surface facing the back case 2b.

Subsequently, FIG. 7 shows a schematic external view of the ion generator 18 used in the present invention. FIG. 8 shows a schematic external view of a battery 19 used in the present invention. The ion generator 18 disposed in the isolation chamber 22b has a plurality of

ion emitting portions

18a and 18b facing the air passage 8. Each

ion emission part

18a, 18b is provided with a counter electrode 181 and a needle-like discharge electrode 182, respectively. The main body portion 18c of the ion generator 18 has a built-in high-voltage electricity generation circuit, and operates by receiving power supply from the battery 19 through a terminal portion 15a from a terminal 18d provided on the side surface.

A high voltage having an AC waveform or an impulse waveform is applied to the discharge electrode 182 by the high voltage electricity generation circuit. As described above, the ion generator 18 has a plurality of discharge electrodes 182, and a positive voltage is applied to one discharge electrode 182, and ions generated by ionization are combined with moisture in the air and mainly H ⁺ (H ₂ O) Positive cluster ions consisting of m are formed. A negative voltage is applied to the other discharge electrode 182, and ions generated by ionization combine with moisture in the air to form negative cluster ions mainly composed of O ₂ ⁻ (H ₂ O) n. Here, m and n are arbitrary natural numbers.

The positive ions H ⁺ (H ₂ O) m and the negative ions O ₂ ⁻ (H ₂ O) n are simultaneously sent in the air to aggregate and surround them on the surface of airborne bacteria and odor components. Then, as shown in the formulas (1) to (3), the active species [.OH] (hydroxyl radical) and H ₂ O ₂ (hydrogen peroxide) are generated on the surface of airborne bacteria and odor components. Destroy them.

H ⁺ (H ₂ O) m + O ₂ ⁻ (H ₂ O) n → OH + 1 / 2O ₂ + (m + n) H ₂ O (1)
^{_{H + (H 2 O) m}} + H + (H 2 O) m '+ O 2 - (H 2 O) n + O 2 - (H 2 O) n'
→ 2 OH + O ₂ + (m + m ′ + n + n ′) H ₂ O (2)
^{_{H + (H 2 O) m}} + H + (H 2 O) m '+ O 2 - (H 2 O) n + O 2 - (H 2 O) n'
→ H ₂ O ₂ + O ₂ + (m + m ′ + n + n ′) H ₂ O (3)
In the above formula, m ′ and n ′ are arbitrary natural numbers.

Further, a blower fan 17 is provided between the control board 15 and the front case 2a. The blower fan 17 is stopped by a boss standing from the back case 2b via a vibration isolating rubber. FIG. 9 is a schematic external view of the blower fan 17 used in the present invention. As shown in FIG. 9, the blower fan 17 is a double-sided suction type turbo fan, and two

intake ports

17 a and 17 a (one on the lower surface) opened in the axial direction of the housing 17 b are arranged in the thickness direction of the housing 2. Is done. The housing 17b has a substantially rectangular parallelepiped shape with a small thickness, a delivery port 17c is provided on one side surface, and the other three side surfaces are covered.

In addition, an air passage 8 is formed inside the front case 2a by being covered with a partition panel 22 that connects the blower fan 17 and the outlet 7. FIG. 11 shows a schematic external view of the partition panel 22 of the present invention. The blower fan 17 of FIG. 9 is inserted into the opening 222b of the partition panel 22. At this time, the outlet 17c of the blower fan 17 is arranged in the direction of the blower guide 221c. The partition panel 22 is a wall body having a substantially U-shaped cross section, and is combined with the bottom wall of the isolation chamber 22 b to form the air passage 8. In the air passage 8, the airflow guide 221 c described above protrudes and is installed to guide the airflow from the blower fan 17 to the air outlet 7.

In such a structure, when the portable blower 1 of the present invention is operated, the blower fan 17 sucks the air sucked from the suction port 6 of the housing 2 as indicated by the arrow A1 between the control board 15 and the blower fan 17. The air is supplied through two routes: a route passing through the front case 2a and a route passing through the gap 25 formed between the front case 2a and the blower fan 17. As the air is blown, one of the suction paths passes through the control board 15 and the isolation chamber 22c to cool each of the bottom walls of the control board 15 and the isolation chamber 22c and indirectly cool the battery 19. Further, the other suction path passes through the side of the control board 15 and reaches the gap 25 with the front case 2 a to cool the control board 15.

Also, the air sent from the blower fan 17 as shown by the arrow A2 cools the bottom wall of the isolation chamber 22b and indirectly cools the ion generator 18 when flowing through the air passage 8. As described above, the air flow guide 221 c for rectifying the sent air flow is provided on the bottom wall of the isolation chamber 22 b toward the air passage 8. The airflow guide 221c is a plurality of plates erected on the bottom wall of the isolation chamber 22b. The airflow guide 221c functions to increase the surface area of the isolation chamber 22b and significantly cools the isolation chamber 22b.

Next, the configuration of the leg 3 will be described. The leg 3 is pivotally supported by the housing 2 by a hinge mechanism. Although the hinge mechanism of the leg 3 is omitted in the drawing, it includes a gear and a spring. Gears formed as a latch mechanism are integrally provided at the left and right ends of the U-shaped leg 3 and are inserted into the left and right through through holes provided on both sides of the back case 2b. It is supported rotatably. The gear is formed with a plurality of teeth around the entire periphery of the left and right shaft portions where the legs 3 are open. A shaft is disposed between adjacent teeth of the gear. One end of the spring is hooked to a shaft and the other end is hooked to a boss standing on the rear case 2b, and constitutes a biasing means for biasing the shaft in a direction of pressing the shaft against the gear.

Rotating the leg 3 causes the gear to rotate integrally, and the shaft moves in the direction of the gear tip against the biasing force of the spring. Then, the relative movement of the shaft between the teeth in the circumferential direction allows the opening / closing angle of the leg 3 to be restricted, and coupled with the shape of the storage portion 2f of the housing 2, the leg 3 can be moved to an appropriate angle less than 180 °. Can be arranged at an angle. Thereby, when the leg 3 is placed on the installation surface of the table, it is possible to maintain a posture in which the back case 2b of the housing 2 is inclined to face the installation surface of the table.

In addition, when the legs 3 are wide open and the back surface of the housing 2 is directed to the tabletop, the portable air blower 1 can be kept in a low posture, and airflow can be blown out at an elevation angle of about 30 ° to 40 °. Furthermore, if the legs 3 are opened narrowly so that the air outlet 7 is lowered, the airflow can be blown downward, and it is installed on the bed headboard (plate on the bed head). Airflow can be sent to the user.

Next, the suction port 6 will be described. The suction port 6 is formed in the lower end portion of the back case 2 as shown in FIGS. A recess-shaped storage portion 2f connected to a groove shape for storing the leg 3 is formed at the lower end portion and both end portions of the back case 2b. Thereby, the leg 3 comes to follow an outer wall surface so that the external appearance of the back case 2b may not be impaired when accommodated.

In addition, a lid 2g can be attached to and detached from the rear case 2b so that the

isolation chambers

22b and 22c are exposed at the portion facing the

isolation chambers

22b and 22c described above so that the ion generator 18 and the battery 19 can be replaced. Is provided. Even when the lid 2g is attached to the back case 2b, a gap is formed between the end surface of the leg 3 stored in the storage portion 2f and the lower end surface of the lid 2g, and the leg 3 is stored in the storage portion 2f ( As shown in FIG. 5, the air inlet 6 is not blocked, and the airflow sucked into the air inlet 6 is always secured. Further, the gap is provided over the full width of the leg 3, and the opening area of the suction port 6 does not change even when the leg 3 is opened or closed. Here, the suction port 6 is provided continuously at the lower end of the back case 2b and at the bottom of the groove-shaped storage portion 2f. Therefore, as shown in FIG. 6, the suction port 6 is formed in a portion that is recessed by one step with respect to the installation surface of the back case 2b. Therefore, even if the lid 2g is placed on the installation surface of the back case 2b as shown in FIG. 6, the suction port 6 is not blocked. Therefore, the airflow sucked into the suction port 6 can always be secured. As a result, the blowing performance of the blower fan 17 is ensured both when the leg 3 is used and when it is not used.

In such a configuration, an operation state will be described with reference to FIG. When the power switch 5 is turned [ON], the operation is started. By the operation of the blower fan 17, air is sent from the suction port 6 provided in the back case 2 b to the inside of the housing 2 as indicated by an arrow A <b> 1. The air that has passed through the blower fan 17 and circulated in the air passage 8 circulates in the air passage 8 as indicated by an arrow A2, and includes ions generated by the ion generator 18. And as shown to arrow A3, the airflow containing a positive ion and a negative ion is blown out toward the upper user's head etc. from the blower outlet 7. FIG. Thereby, while being able to obtain coolness easily outdoors and indoors, disinfection around a user and odor removal can be performed.

FIG. 12 is a schematic view showing a usage state of the portable blower 1 of the present invention. The portable blower 1 of the present invention is provided with a mounting portion 2h for attaching a neck strap outside the housing 2 and on the upper part of the rear case 2b, and the portable blower 1 is suspended from the neck of the user by connecting the neck strap. Can be carried down. In the state where the neck strap is used, as shown in FIG. 12, the length of the neck strap is set so that the portable blower 1 is positioned around the upper abdomen from the chest S of the user. Although it is self-evident, the portable blower 1 at this time is in a posture in which the back case 2b is in contact with the chest S of the user and the air outlet 7 is directed almost directly above. When the power switch 5 is turned on while the portable air blower 1 is suspended from the user's neck or held, the outside air passes through the gap between the user and the housing 2 as indicated by an arrow A1. Is guided to the suction port 6. And the airflow containing ion is sent upwards from the blower outlet 7 as shown by arrow A3.

The portable air blower 1 of the present invention is designed so that the back side (the back case 2b side) of the housing 2 is in contact with the user, and the air outlet 7 is more than the center line in the thickness direction of the housing 2. It is formed to be biased toward the front side (front case 2a side), and such an installation method and usage method are made possible. Since the position of the person's face is slightly forward compared to the position of the person's chest when walking or sitting, it is advantageous that the air outlet 7 is biased to the front of the housing 2. . Moreover, it becomes easy to select the installation position of the blower outlet 7 for making the blowing airflow direction upward and forward by forming the entire housing 2 with a curved surface having a large radius. As a result, the distance L from the rear surface of the housing 2 to the center of the air outlet can be longer than when the air outlet 7 is arranged on the center line in the thickness direction of the housing 2, and the air flow is improved. Therefore, coolness can be obtained even when the portable blower 1 is carried, and sterilization and odor removal around the user can be performed by the action of positive and negative ions.

Also, a shutter 7a that operates in conjunction with the operation switch 5 is provided at the air outlet 7 so that foreign matter does not enter. When the portable blower 1 is used over the neck, it is predicted that the air outlet 7 faces upward. Therefore, when a user eats and drinks, a piece of food or a beverage may spill out and fall into the outlet 7 unfortunately. This is to prevent such unforeseen events.

The power switch 5 is provided with a protrusion on the back surface that penetrates the back case 2b. By operating the arm (not shown) of the shutter 7a, the protrusion 7 moves the position of the shutter 7a toward the back case 2b. . When blowing, the shutter 7a moves to the front of the isolation chamber 22b provided in the back case 2b so as not to block ventilation.

In the above embodiment, only negative ions may be emitted by the ion generator 18. Thereby, a user's relaxation effect can be acquired.

According to the present invention, it can be used for a portable blower device or a portable aroma device provided with a blower fan in a portable casing.

DESCRIPTION OF SYMBOLS 1 Portable air blower 2 Case 2a Front case

2b Rear case

2c Side cover 2g Lid 22b, 22c Isolation room 3 Leg 4 Display part 5 Power switch 6 Suction port 7 Outlet 8 Air passage 17 Blower fan 18 Ion generator 19 Battery 22 Partition panel 25 Clearance

Claims

In a portable air blower having a blower fan, a flat housing that houses the blower fan, a suction port that is formed in the housing, and the blower fan sucks air and a blower outlet that blows out the sucked air.
The portable air blower according to claim 1, wherein the air inlet and the air outlet are formed on a peripheral side surface of the housing and are respectively located on both front and rear sides in the air blowing direction of the blower fan.
The portable air blower according to claim 1, wherein the air outlet is unevenly distributed on one surface side of the housing.
A mounting portion for attaching a strap for carrying the portable blower is provided on a peripheral side surface where the air outlet is located,
The portable air blower according to claim 2, wherein the attachment portion is closer to the other surface side of the housing than the air outlet.
The portable air blower according to claim 2 or 3, wherein the suction port is formed at a position closer to the other surface side than the one surface side of the casing.
On the peripheral side surface where the suction port of the housing is located, a recess is formed,
The portable air blower according to claim 1 or 2, wherein the suction port is opened in the recess.
The portable air blower according to claim 1 or 2, wherein the casing is formed with a curved surface on one side and / or the other side.
The portable air blower according to claim 1, wherein the casing has a thickness at a center portion larger than a thickness at an edge portion.