JP6421322B2 - Blower - Google Patents

Description

  The present invention relates to a blower, and more particularly to a blower that gives a refreshing feeling by blowing air or promotes air circulation in a space.

  Conventionally, this type of air blower includes an impeller and a motor in a base serving as a pedestal, and air is circulated so as to blow out horizontally from an annular air blower provided at the top of the base. In addition, a home blower that generates a flow of air is known (for example, see Patent Document 1).

  Hereinafter, the blower will be described with reference to FIGS. 14 and 15.

  FIG. 14 is a front view of the blower assembly 100, and FIG. 15 is a cross-sectional view of the blower assembly 100. The blower assembly 100 has an annular nozzle 101 that defines a central opening 102. A motor 122 that creates an air flow through the annular nozzle 101 is disposed within the base 116 along with the motor housing 126. Further, an impeller (impeller) 130 is connected to a rotating shaft extending outward from the motor 122, and the diffuser 132 is positioned on the downstream side of the impeller 130. The motor 122 is connected to an electrical connection unit and a power source, and a plurality of selection buttons 120 allows the user to operate the blower assembly 100.

  With the above configuration, the above-described blower assembly 100 operates as follows. In other words, the motor 122 is driven by the user appropriately selecting from a plurality of selection buttons 120. Thus, the motor 122 is activated and air is drawn into the blower assembly 100 through the air inlet 124. Air flows through the outer casing 118 to the inlet 134 of the impeller 130. The air flow that exits the outlet 136 of the diffuser 132 and the exhaust portion of the impeller 130 is divided into two air flows that travel in opposite directions through the internal passage 110.

  The air flow is throttled as it enters the mouth 112 and is further throttled at the outlet 144 of the mouth 112. This throttling creates pressure in the system.

  The air flow thus created overcomes the pressure produced by the restriction and the air flow exits through the outlet 144 as the primary air flow. The primary air flow is concentrated or focused toward the user depending on the arrangement of the guide portion 148. The secondary air flow is generated by entrainment of air from the outside environment, particularly from the area around the outlet 144 and around the outer edge of the annular nozzle 101. This secondary air flow passes through the central opening 102 where there is a total air flow that mixes with the primary air flow and is discharged forward from the blower assembly 100.

JP 2010-077969 A

Such a conventional air blower has provided the guide part 148 in the downstream area of the high pressure air outlet, thereby realizing an expanded blowing air. However, if the angle of the guide portion 148 is widened to a certain degree or more in order to expand the airflow, the airflow will not flow along the guide portion 148 . In other words, there was a limit to expanding the blowing wind beyond a certain level. In addition, in order to solve this problem, it is necessary to extend the length of the guide portion 148 in the flow direction of the blown air, thereby increasing the size of the blower.

  Therefore, the present invention solves the above-described conventional problems, and an object of the present invention is to provide a blower capable of blowing air over a wider range than before without increasing the size.

  The present invention provides a high-pressure air generating means including a suction port for taking air into a cylindrical housing, an impeller for generating high-pressure air, and a motor for driving the impeller, and the high-pressure air A first air passage that guides the air taken in from the air inlet to the air outlet through the high-pressure air generating means, and the air that is attracted by the air that is blown out from the air outlet A plurality of suction air suction ports of the same shape provided at equal intervals in the circumferential direction of the housing, a suction air mixing unit for mixing the air sucked into the plurality of suction air suction ports, and the suction air An attraction air outlet for blowing out the air mixed in the mixing section; a second air passage communicating the attraction air outlet from the attraction air inlet through the attraction air mixing section; and the attraction air inlet A feeding device with adjusting means for changing the opening area A device, thereby is to achieve the intended purpose.

  ADVANTAGE OF THE INVENTION According to this invention, the air blower which can ventilate more widely than before can be provided, without enlarging by adjusting the air quantity which flows in into an attraction air mixing part.

The perspective view of the air blower of the state which has not mounted | wore the adjustment means of Embodiment 1 of this invention The upper perspective view of the internal member of Embodiment 1 of the present invention The lower perspective view of the internal member of Embodiment 1 of the present invention Sectional drawing of the internal member of Embodiment 1 of this invention The figure which looked at the air blower of Embodiment 1 of this invention from the upper surface side. The figure which looked at the air blower of Embodiment 1 of this invention from the lower surface side. The perspective view of the adjustment means of Embodiment 1 of this invention The perspective view of the air blower in case the attraction | suction air inlet of Embodiment 1 of this invention is not obstruct | occluded The perspective view of the air blower at the time of closing the attracting air suction inlet of Embodiment 1 of this invention Sectional drawing of the air blower of Embodiment 1 of this invention (A) The schematic diagram of the flow of the blowing air of the air blower in case the induced air suction port of Embodiment 1 of this invention is not obstruct | occluded, (b) The obstruction air suction port of Embodiment 1 of this invention is obstruct | occluded. Schematic diagram of the flow of blown air from the blower when The perspective view of the air blower in case the attraction | suction air inlet of Embodiment 2 of this invention is not obstruct | occluded The perspective view of the air blower at the time of closing the attracting air suction inlet of Embodiment 2 of this invention Front view showing an example of conventional technology Sectional drawing which shows an example of a prior art

  A blower device according to the present invention includes a suction port for taking air into a cylindrical housing, an impeller for generating high-pressure air, and a high-pressure air generating unit configured by a motor for driving the impeller. The air outlet for blowing out the high-pressure air, the first air passage for guiding the air taken in from the suction port to the air outlet through the high-pressure air generating means, and the air blown out from the air outlet. A plurality of air inlets of the same shape provided at equal intervals in the circumferential direction of the housing, and an air intake mixing unit that mixes the air sucked into the air inlets. An attraction air outlet for blowing out the air mixed in the attraction air mixing section; a second air passage communicating with the attraction air outlet from the attraction air inlet through the attraction air mixing section; and the attraction Adjuster that changes the opening area of the air inlet A blower having and. Thereby, it becomes possible to blow in a wider range than before without increasing the size of the blower.

  Moreover, the air blower which concerns on this invention may provide the adjustment means which obstruct | occludes the same area in all the attraction | suction air suction inlets, respectively. Thereby, even if all the attracting air suction ports are closed, it becomes possible to provide the symmetries of the blowing air with respect to the central axis of the housing.

  Further, the blower according to the present invention is a cover in which the adjusting means is configured in a cylindrical shape and covers the attraction air suction port by sliding on the outer peripheral side of the housing, and the cover includes the attraction air suction port. A cover opening that is equal to or larger than the opening area and smaller than the sum of the opening area and the area of the side surface of the casing sandwiched between two adjacent attraction air suction ports is equal to the circumferential direction of the cover, etc. You may provide the same number as the said attraction | suction air suction inlet in a space | interval. Thereby, regardless of the size of the attraction air inlet and the attraction air outlet, the user can arbitrarily and easily change the nature of the blowing air.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention. The following embodiment is an example embodying the present invention, and is not an accurate one that limits the technical scope of the present invention. Moreover, the same code | symbol is attached | subjected about the same site | part through all drawings, and description is abbreviate | omitted. Furthermore, in each drawing, the description of the details of each part not directly related to the present invention is omitted.

(Embodiment 1)
Hereinafter, the configuration of Embodiment 1 of the present invention will be described in detail with reference to FIGS.

  As shown in FIG. 1, the blower 11 without the adjustment means includes a main housing 12, a sub-housing 13, and an internal member 14.

  FIG. 1 is a perspective view of the blower without the adjusting means attached. The main housing 12 has a hollow cylindrical shape, and has a circular opening on the upper surface when the air blowing direction (arrow 50) is upward. In addition, a concave portion 51 is provided on the side surface of the main housing 12 over the entire circumference from the outer peripheral wall of the main housing 12 toward the central axis of the main housing 12 near the center in the height direction.

  The recess 51 has a depth of about half the thickness of the wall surface of the main housing 12. In addition, a plurality of rectangular attracting air suction ports 19 (six in the first embodiment) are provided on the bottom surface of the recess 51 (side surface of the main housing 12).

  The attraction air suction port 19 is a rectangular opening having a long side length X, a short side length Y, and an opening area Z, and is connected to the internal space from the outer surface of the main housing 12. Are provided as openings. Moreover, the attraction | suction air inlet 19 is arrange | positioned at equal intervals in the circumferential direction so that a long side may become parallel to a ventilation direction. In addition, the side surface of the main housing 12 sandwiched between two adjacent attraction air inlets 19 is defined as a bottom rectangular portion 23 (shaded area in FIG. 1), and will be used for the following description. When the bottom rectangular portion 23 is defined in more detail, a rectangle having two sides which are adjacent to each other between the two attraction air suction ports 19 among a plurality of sides constituting the two attraction air suction ports 19 adjacent to each other. Can be an area.

  The sub-housing 13 has a hollow cylindrical shape, and a suction port 15 that is opened in a slit shape is provided below the side surface.

  The internal member 14 is inserted into the hollow interior of the main housing 12. Further, at the center of the internal member 14, an attracting air mixing portion 21 is provided in which air sucked through the attracting air suction port 19 is mixed. In addition, on the upper surface when the air blowing direction (arrow 50) is set to the upper side, an induced air outlet 17 that is a circular opening surrounded by the inner peripheral wall 54 is provided. Further, the upper surface of the internal member 14 is provided with an air outlet 18 configured to be sandwiched between the outer peripheral wall of the internal member 14 and the inner peripheral wall of the main housing 12. The details of the portion of the internal member 14 inserted into the main housing 12 will be described below.

  FIG. 2 is a top perspective view of the internal member. As shown in FIG. 2, the internal member 14 forms an axisymmetric bowl-shaped body. In addition, the inner member 14 is configured such that the outer peripheral wall 55 gradually increases in diameter from the lower side (bottom surface 53) toward the induced air outlet 17. That is, the outer peripheral wall 55 is inclined from the center of the circle to the outer side from the lower side to the upper side. With this configuration, the air path formed by the outer peripheral wall 55 of the internal member and the inner periphery of the main housing 12 is increased in pressure from the bottom surface to the outlet 18 during blowing. The internal member 14 is provided with six communicating hollow protrusions 16 projecting radially from the wall surface of the outer peripheral wall 55 of the inner member 14 toward the outer periphery.

  The communication hollow convex portion 16 includes a hollow portion 41 having a rectangular opening portion 40 having a long side length X, a short side length Y, and an opening area Z, similarly to the attracting air suction port 19. A joint surface 43 is provided on the periphery of the opening 40. The joint surface 43 is configured so as to be in close contact with the inner wall of the main housing 12 and the periphery of the attraction air inlet 19 when the internal member 14 is inserted into the main housing 12. The communicating hollow convex portion 16 communicates with the induced air mixing portion 21 through the hollow portion 41.

  FIG. 3 is a lower perspective view of the internal member. As shown in FIG. 3, a cylindrical depression 52 is provided at the center of the bottom surface 53 on the outer peripheral side of the internal member 14. A motor constituting the high-pressure air generating means is fixed to the depression 52, details of which will be described later.

  4 is a cross-sectional view taken along a plane passing through A-A ′ in FIG. 2 and parallel to the blowing direction 50. As shown in FIG. 4, an inner peripheral convex portion 44 that protrudes from the inner peripheral wall toward the induced air mixing portion 21 is provided at a position sandwiched between the hollow portions 41 on the inner peripheral side of the internal member 14. The inner circumferential convex portion 44 extends vertically from the vicinity of the upper end of the hollow portion 41 to the inner bottom surface of the inner member 14.

  In addition, the inner member 14 is configured such that the inner peripheral wall 54 gradually increases in diameter from the upper end of the opening 40 toward the induced air outlet 17. That is, the inner peripheral wall 54 is provided with an inclination 56 from the center of the circle to the outer side from the lower side to the upper side.

  FIG. 5 is a view of the air blower as viewed from the upper surface side. As shown in FIG. 5, the blower 11 has an internal member 14 inserted in the hollow interior of the main housing 12. The central axis of the internal member 14 in the air blowing direction coincides with the central axis of the main housing 12 in the air blowing direction. Further, the inner peripheral wall 54 of the inner member 14 is configured to project inward in the central axis direction from the circular opening of the inner member 14 downward (bottom surface 53). Further, the six communicating hollow convex portions 16 are respectively connected to the six attraction air suction ports 19 so that the attraction air suction port 19 and the attraction air mixing portion 21 communicate with each other. However, in FIG. 5, only three instruction lines are drawn for the six communicating hollow convex portions 16 and the six attracting air suction ports 19 in order to prioritize the visibility of the drawing.

  In addition, the arrow 42 has shown the path of the attraction | suction wind from the outer periphery of the air blower 11 until it mixes in the attraction air mixing part 21. FIG.

  FIG. 6 is a view of the air blower as viewed from the lower surface side. As shown in FIG. 6, the bottom surface of the sub-housing 13 is provided with a bottom surface suction port 45 that is opened in a slit shape.

  The above is the detailed structure of the main housing 12, the sub-housing 13, and the internal member 14. By combining these, the first air passage and the second air passage are formed. That is, the air outlet 15 and the bottom surface inlet 45 are blown out by the region surrounded by the inner peripheral wall of the main housing 12, the inner peripheral wall of the sub-housing 13, the outer peripheral wall of the internal member 14, and the outer peripheral wall of the communication hollow protrusion 16. A first air passage communicating up to 18 is formed. Further, the induced air inlet port 19, the inner peripheral wall (hollow portion 41) of the hollow convex portion 16, and the inner wall of the internal member 14, the induced air outlet port 17 through the induced air mixing portion 21 from the induced air inlet port 19. A second air passage communicating with is constructed.

  Note that the first air passage and the second air passage do not have air traffic, that is, are configured independently of each other. The shape of each air passage will be described in detail later with reference to other drawings.

  Next, details of the cover, which is the adjusting means, will be described with reference to FIG. 7. FIG. 7 is a perspective view of the adjusting means.

  As shown in FIG. 7, the cover 20 (adjusting means) is configured in a hollow cylindrical shape, and the thickness of the cylindrical side wall portion is a thickness that complements the recessed portion of the recessed portion 51, that is, the wall surface of the main housing 12. The thickness is about half of the thickness.

  Further, on the side surface of the cover 20, a cover opening 24 that is equal to or larger than the opening area Z of the attraction air suction port 19 and smaller than the sum of the opening area Z and the surface area of the bottom rectangular portion 23 is a circle of the cover 20. The same number (at six in the first embodiment) of the induced air suction ports 19 is provided at equal intervals in the circumferential direction.

  FIG. 8 is a perspective view of the air blower when the attracting air inlet is not closed. In FIG. 8, the blower 11 is configured so that the cover 20 is sandwiched and attached by the step of the recess 51, and the cover opening 24 communicates with the induced air mixing unit 21. The case where the cover 20 does not block the attraction air suction port 19 refers to the case where the cover opening 24 is disposed at a position where it does not cover the attraction air suction port 19. In this state, the entire opening area Z of the attracting air suction port 19 is used for sucking the attracting air.

  FIG. 9 is a perspective view of the blower when the attracting air suction port is closed. As shown in FIG. 9, the cover 20 is slidably moved concentrically with the air inlet 17 while covering the air inlet 19, and is in a position to close a part of the air inlet 19. Can be moved. Moreover, when the cover 20 is slid by the said structure, each attraction air inlet 19 can be obstruct | occluded simultaneously by the same area, respectively.

  In FIG. 9, the cover 20 closes about 30% of each attraction air inlet 19. The area of the cover opening 24 is equal to or larger than the opening area Z of the attracting air suction port 19, but is smaller than the sum of the opening area Z and the surface area of the bottom rectangular portion 23. That is, no matter where the cover 20 is moved, the attracting air suction port 19 is not completely closed.

  Next, the operation principle of the blower 11 will be described with reference to FIGS. 10 and 11. 10 is a cross-sectional view of the blower, and FIG. 11 is a schematic view of the blown air when the attracting air suction port is not closed and when it is closed. However, the blockage mentioned here does not mean blocking the 100% induction wind, but means blocking a part of the attraction air suction port 19, and the same applies to the following description.

  As shown in FIG. 10, a high-pressure air generating means 28 including an impeller 26 that generates high-pressure air 25 and a motor 27 that rotates the impeller 26 is provided around the suction port 15 in the sub-housing 13. Yes. The motor 27 is fixed to the depression 52 of the internal member 14.

  In the above-described configuration, as shown in FIG. 10, the high-pressure air 25 generated by operating the high-pressure air generating means 28 passes from the suction port 15 and the bottom surface suction port 45 to the outlet 18 via the high-pressure air generating means 28. It flows through the first airway that communicates. That is, in FIG. 10, it is an air path which shows the flow of the high pressure air 25, Comprising: The part in the air blower 11 becomes the above-mentioned 1st air path.

  The attraction air 31 is attracted by the high-pressure air 25 discharged from the air outlet 18 and is taken into the air blower 11 from the attraction air suction port 19. And the attraction air 31 flows through the 2nd wind path connected to the attraction air blower outlet 17 via the attraction air mixing part 21 from the attraction air suction inlet 19, and is discharged | emitted from the attraction air blower outlet 17. FIG. That is, in FIG. 10, it is an air path which shows the flow of the attraction air 31, Comprising: The part in the air blower 11 becomes the above-mentioned 2nd air path. At this time, in the present embodiment, the inner peripheral convex portion 44 is provided, but the inner peripheral convex portion 44 blocks the mutual interference of the plurality of attraction airs 31 and collects the attraction air 31 in the attraction air mixing portion 21. Therefore, improvement in the air blowing performance can be expected.

  In the operation state of the blower 11 shown above, the opening area of the induced air suction port 19 is changed using the cover 20, and the amount of air flowing into the induced air mixing unit 21 is changed, so that the second air path and It becomes possible to adjust the pressure of the area | region 32 downstream of the induction air blower outlet 17. FIG.

  Further, the direction of the flow of the high-pressure air 25 blown out from the induced air outlet 17 is affected by the pressure in the second air path and the region 32 downstream of the induced air outlet 17.

  That is, the flow of the high-pressure air 25 can be changed by adjusting the amount of air flowing into the induction air mixing unit 21 and the induction air outlet 17. And it becomes possible to change the direction of the blowing wind 33 with which the high pressure air 25 and the attraction air 31 were combined by this.

  Fig.11 (a) is a schematic diagram of the flow of the blowing air of the air blower when the attraction | suction air inlet is not obstruct | occluded. As shown in FIG. 11 (a), when all the attracting air suction ports 19 are not closed at all, the high-pressure air 25 blown out from the pulling air outlet 17 is almost straight in the same direction as the direction of the outlet 18. Flowing into. For this reason, the blowing air 33 also flows almost straight in the same direction as the direction of the air outlet 18.

  However, as described with reference to FIG. 9, the amount of air flowing into the attraction air mixing unit 21 is reduced by reducing the total opening area of the attraction air suction port 19 in all the attraction air suction ports 19. Let As a result, the pressure in the region 32 downstream of the second air passage and the induced air outlet 17 is reduced. As a result, as shown in FIG. 11 (b), the high-pressure air 25 blown out from the induction air outlet 17 is attracted to a region where the pressure is low, and the air currents collide at the collision point 34, and thereafter, the air flows toward the downstream direction. Flows in a distributed manner. In addition, FIG.11 (b) is a schematic diagram of the flow of the blowing air of an air blower when the attraction | suction air suction inlet is obstruct | occluded.

  As described above, the blown air 33 changes to an air flow that concentrates at one point as it approaches the collision point 34 in the upstream region from the collision point 34. On the other hand, in the region downstream of the collision point 34, the airflow changes as the distance from the collision point 34 increases.

  As a result, when the user is upstream from the collision point 34, that is, when the user is close to the blower 11, it is possible to receive the blown air 33 with an increased flow rate so that the user concentrates on one point. become. On the other hand, when the user is downstream from the collision point 34, that is, when the user is far from the blower 11, the flow rate of the blown air on the wind receiving surface becomes more uniform, and the wind receiving area is expanded. By this phenomenon, more users can enjoy the gentle blowing air 33 without increasing the size of the blower 11.

  By the way, the pressure of the area | region 32 falls and the collision point 34 is a position closer to an air blower, so that the sum total of the opening area of the attraction air inlet 19 becomes small compared with the opening area of the attraction air blower outlet 17. Move to. That is, since the high-pressure air 25 is bent sharply so as to flow into the region 32 and the airflows collide with each other, the loss due to this collision becomes large. As a result, not only the flow rate but also the flow rate deteriorates. Therefore, it is desirable that the opening area of the induced air inlet 19 is always equal to or more than about twice the opening area of the induced air outlet 17 so that both the flow velocity and the flow rate do not deteriorate.

In the present embodiment, six attraction air inlets 19 are provided, and the total opening area of the attraction air inlets 19 is the opening of the attraction air outlet 17 when the cover 20 does not block the attraction air inlet 19 at all. It is set to be about 1.5 times the area. Further, when the induced air suction port 19 is closed by the cover 20, the opening area of the induced air outlet 17 is set to be approximately the same.

  Thereby, it can be set as the air blower which obtains sufficient flow velocity and does not reduce a flow rate.

  In the present embodiment, the suction port 15 and the bottom surface suction port 45 are provided on the side surface and the bottom surface of the sub-housing 13, respectively. However, it is not always necessary to provide the bottom suction port 45 on the bottom surface.

  Moreover, in this Embodiment, although the blower outlet 18 is provided in circular slit shape, if the induced air blower outlet 17 is provided so that it may be located inside the blower outlet 18, it will become the shape of the blower outlet 18. There is no particular limitation.

  Further, in the present embodiment, the cover 20 is provided so as to be manually moved on the concentric circle with the attraction air outlet 17, but there is no particular designation in the range and the moving method of the cover 20.

  Moreover, in this Embodiment, although the inner peripheral convex part 44 is provided, this inner peripheral convex part 44 has interrupted the mutual interference of the several attraction air 31. FIG. That is, since the attraction air 31 can be collected in the attraction air mixing part 21, the improvement of ventilation performance can be expected.

(Embodiment 2)
Hereinafter, the configuration of the second embodiment of the present invention will be described in detail with reference to FIGS. 12 and 13. 12 is a perspective view of a blower provided with a rib around the attraction air suction port when the attraction air suction port is not closed. FIG. 13 is an attraction of the rib when the attraction air suction port is closed by about 30%. It is a perspective view of the air blower provided in the air suction port periphery.

  As shown in FIGS. 12 and 13, the blower 11 includes a first rib 35 that defines the position of the cover 20 when the cover 20 does not block the opening area of the induced air suction port 19, and the induced air suction port 19. Second ribs 36 are provided to determine the position of the cover 20 when the opening area is closed as much as possible.

  The first rib 35 is located near the upper circumferential portion of the attracting air suction port 19 and the end in the circumferential direction, and the second rib 36 is located near the upper circumferential portion of the attracting air suction port 19 and the central portion in the circumferential direction. ing. Further, both the first ribs 35 and the second ribs 36 are provided in the circumferential direction of the main housing 12 at the same number as the induced air suction ports 19 (six in the second embodiment).

  This prevents the user from moving and using the cover 20 to a position where both the flow velocity and the flow rate of the blower 11 are deteriorated, and the position of the cover 20 intended by the designer. It becomes possible for the user to easily determine within the range. As a result, it is possible to change the properties of the blowing air 33 in which both the flow velocity and the flow rate are compatible.

  In the present embodiment, six rectangular parallelepiped first ribs 35 and six second ribs 36 are provided on the side of the air outlet 18 around the attraction air suction port 19. There is no particular designation in the shape and number of the second ribs 36 and the installation location.

  The blower according to the present invention makes it possible to provide a blower that can blow air over a wider range than before without increasing the size.

DESCRIPTION OF SYMBOLS 11 Blower 12 Main housing 13 Sub housing 14 Internal member 15 Suction port 16 Communication hollow convex part 17 Inductive air blower outlet 18 Outlet 19 Inductive air suction inlet 20 Cover 21 Induced air mixing part 23 Bottom rectangular part 24 Cover opening part 25 High-pressure air 26 Impeller 27 Motor 28 High-pressure air generating means 31 Attracting air 32 Region 33 Blowing air 34 Collision point 35 First rib 36 Second rib 40 Opening portion 41 Hollow portion 42 Arrow 43 Joining surface 44 Inner peripheral convex portion 45 Bottom suction port 50 Blowing direction 51 Concave portion 52 Recessed portion 53 Bottom surface 54 Inner peripheral wall 55 Outer peripheral wall

Claims (3)

In the cylindrical housing,
A suction port for taking in air;
High-pressure air generating means comprising an impeller for generating high-pressure air and a motor for driving the impeller;
An air outlet provided on a predetermined circular surface of the housing, for blowing out the high-pressure air;
A first air passage for guiding the air taken in from the suction port to the air outlet through the high-pressure air generating means;
A plurality of air inlets of the same shape provided at equal intervals in the circumferential direction of the housing, which are attracted to the air blown out from the air outlet and suck in air;
An attraction air mixing unit that mixes air sucked into the plurality of attraction air inlets;
An induced air blowout port that is provided on the center side of the blowout port on the predetermined surface and blows out the air mixed in the induced air mixing unit;
A second air passage communicating the attraction air outlet from the attraction air inlet through the attraction air mixing unit;
The air blower provided with the adjustment means which changes the opening area of the said attraction | suction air suction inlet. The adjusting means is
The air blower according to claim 1, wherein the same area is closed at all the attraction air inlets. The adjusting means is
A cover that is configured in a cylindrical shape and covers the attraction air inlet by sliding on the outer peripheral side of the housing,
The cover includes
A cover opening that is equal to or larger than the opening area of the attraction air suction port and smaller than the sum of the opening area and the area of the side surface of the casing sandwiched between two adjacent attraction air suction ports is the cover. The air blower according to claim 2, wherein the same number as the attraction air suction ports is provided at equal intervals in the circumferential direction.

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