Axial Flow Blower

Abstract

To provide an axial blower enabling suppression of reduction of air quality and furthermore enabling air velocity to be effectively increased.SOLUTION: The axial blower comprises: a housing 10 in which a draft air duct 17 leading from a suction port 15 to a delivery port 16 is formed; an electric motor 30; and an air blowing fan 40 for blowing air from the suction port 15 to the delivery port 16. In the housing 10, a portion of the draft air duct 17 extending in the rotation axis direction of the air blowing fan 40 is formed, and a blast pipe 12 is provided in which the leading end opening functions as a delivery port 16. At the front end of the blowout pipe 12 comprised of a straight pipe, an R portion (a first R portion ) 19a is provided which is comprised of a rounded circular arc at the outside.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to an axial flow blower. [Background technology]

[0002] An axial blower for blowing away fallen leaves and dust by discharging a high-speed airflow includes a housing in which an airflow passage is formed, a motor case disposed within the airflow passage, an electric motor (hereinafter simply referred to as a motor) housed within the motor case, and a blower fan connected to a drive unit of the motor. In such an axial blower, the blower fan is rotated by the driving force of the motor, generating an airflow from the intake port of the airflow passage to the exhaust port (see, for example, Patent Document 1).

[0003] Conventional axial flow blowers include a cylindrical or tubular blowing pipe (also called a blower nozzle, blower pipe, nozzle, etc.) extending in the front-to-rear direction (longitudinal direction) attached to an opening formed in a housing, with the front opening (tip opening) of the blowing pipe forming the discharge port and the blowing pipe having a tapered shape that tapers off (see, for example, Patent Documents 1 to 3). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-076355 A [Patent Document 2] JP 2019-152105 A [Patent Document 3] US Patent Application Publication No. 2015 / 0143657 Summary of the Invention [Problem to be solved by the invention]

[0005] Generally, motor-driven axial flow blowers have a weaker air blowing force (flow velocity) than centrifugal blowers, so the wind velocity has been increased by tapering the tip of the blowing pipe at a specified angle to throttle the air passing through it, as disclosed in the above Patent Documents 1 to 3. However, while the above-mentioned tapered shape increases the wind velocity, it also reduces the amount of air that can be blown out.

[0006] For this reason, it is possible to increase the air volume by making the blower fan larger or increasing the rotation speed of the motor, but making the blower fan larger will result in a larger blower, and increasing the rotation speed of the motor will increase the operating noise of the blower, causing noise problems.Since the operating noise of the blower is smaller in a motor-driven type than in an engine-driven type, it is not desirable to increase the rotation speed of the motor to increase the air volume.

[0007] The present invention has been made in consideration of the above-mentioned problems, and an object of the present invention is to provide an axial flow blower that can effectively increase air speed while suppressing a decrease in air volume. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems, the axial blower of the present invention comprises a housing in which an intake port and an exhaust port are formed, and in which an air passage is formed connecting the intake port to the exhaust port, an electric motor arranged within the housing, and a blower fan connected to the electric motor and rotates within the air passage by the driving force of the electric motor, thereby blowing air from the intake port to the exhaust port, wherein the housing is provided with an outlet pipe which forms part of the air passage extending in the direction of the rotation axis of the blower fan and has a tip opening which serves as the exhaust port, and the tip of the outlet pipe is provided with an R portion consisting of an arc which is rounded on the outside.

[0009] In a preferred embodiment, the blowing pipe may be a straight pipe.

[0010] In another preferred embodiment, the R portion may be a first R portion, and a second R portion formed of an inwardly rounded arc may be connected to the tip of the first R portion.

[0011] In another preferred embodiment, the radius of the arc of the second R-portion may be smaller than the radius of the arc of the first R-portion.

[0012] In another preferred embodiment, a straight portion having a constant diameter may be connected to the tip end of the second R portion.

[0013] In another preferred embodiment, the ratio of the diameter of the straight portion to the diameter of the tip portion of the blowing pipe may be set within a range of 70% to 90%.

[0014] In another preferred embodiment, the ratio of the radius of the arc of the first R-portion to the diameter of the straight portion may be set within a range of 10% to 30%.

[0015] In another preferred embodiment, the diameter of the tip of the blowing pipe may be 90 mm, the radius of the arc of the first R portion may be 10 to 25 mm, and the radius of the arc of the second R portion may be less than 10 mm.

[0016] In another preferred embodiment, a straight portion having a constant diameter may be connected to the tip of the R portion.

[0017] In another preferred embodiment, a straightening vane serving as a stationary vane for straightening the flow of air blown out by the blower fan may be disposed downstream of the blower fan serving as a moving blade, and the R portion may be disposed downstream of the straightening vane. Effect of the Invention

[0018] According to the present invention, by providing a rounded portion at the tip of the blow-out pipe provided in the housing, it is possible to effectively increase the wind speed while suppressing a decrease in the air volume. [Brief description of the drawings]

[0019] [Figure 1] 1 is an overall perspective view showing an axial flow blower according to an embodiment of the present invention as viewed from above; [Diagram 2] 1 is an overall perspective view showing an axial flow blower according to an embodiment of the present invention as viewed from below; [Diagram 3] FIG. 2 is a vertical cross-sectional view showing a drive portion of the axial flow blower according to the embodiment of the present invention. [Figure 4] FIG. 2 is a vertical sectional perspective view showing a drive portion of an axial flow blower according to an embodiment of the present invention. [Diagram 5] FIG. 2 is an enlarged vertical cross-sectional view showing a tip portion of an axial flow blower according to an embodiment of the present invention. [Figure 6] 6 is an enlarged vertical cross-sectional view illustrating the air flow near the tip of the blowing pipe shown in FIG. 5. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, the present invention will be described in detail with reference to the drawings showing the embodiments of the present invention. In this specification, the air intake side (in other words, the operator side) is referred to as the rear side or base side, the air discharge side (in other words, the side opposite to the operator side) is referred to as the front side or tip side, the side where the handle that the operator holds is provided is referred to as the upper side, and the opposite side is referred to as the lower side.

[0021] As shown in Figures 1 and 2, the axial blower 1 of this embodiment includes a housing 10 in which an air passage 17 is formed, which connects from an inlet 15 to a discharge outlet 16. In addition, within the housing 10, as shown in Figures 3 and 4, there are provided a motor case 20, an electric motor 30, a blower fan 40 connected to the electric motor 30, and a baffle plate 60 arranged in the air passage 17.

[0022] In the axial flow blower 1, the driving force of the electric motor 30 rotates the blower fan 40 in the air passage 17, generating a high-speed airflow from the suction port 15 toward the discharge port 16, and the airflow is discharged to the outside from the discharge port 16. An operator can blow away fallen leaves and dust by blowing the airflow from the discharge port 16 onto the ground while holding the axial flow blower 1.

[0023] The housing 10 includes a main body 11 and an outlet pipe 12 protruding forward from the main body 11 .

[0024] The main body 11 is a resin cylinder or box extending in the front-rear direction and having an open front end face. The left and right side surfaces and the bottom surface of the rear part of the main body 11 are each formed with an intake port 15 consisting of a plurality of slit holes. Hereinafter, the intake port 15 formed on the left and right side surfaces (side walls) of the rear part of the main body 11 and taking in outside air (air) from the side into the main body 11 (air passage 17) may be referred to as a side intake port 13, and the intake port 15 formed on the bottom surface (bottom wall) of the rear part of the main body 11 and taking in outside air (air) from below into the main body 11 (air passage 17) may be referred to as a bottom intake port 14. In this embodiment, the rear end surface of the main body 11 (in other words, the rear end part of the air passage 17) is closed by a rear wall 18 formed in a rectangular shape (without an intake port).

[0025] The blow pipe 12 is a cylindrical member (straight pipe) made of resin and extending in the front-rear direction. The rear part of the blow pipe 12 is inserted into and attached to the front opening of the main body 11. The front part of the blow pipe 12 protrudes forward from the front opening of the main body 11. The front opening (tip opening) of the blow pipe 12 forms the discharge port 16.

[0026] As shown in Figures 3 and 4, an external cylinder 50 is formed in the center of the main body 11. The external cylinder 50 is a cylindrical member made of resin and extends in the front-rear direction. The front part of the external cylinder 50 extends straight in the front-rear direction (the diameter is constant in the front-rear direction) and is formed to have a slightly smaller diameter than the rear end (base end) of the blow-off pipe 12. The rear part of the external cylinder 50 is formed in a tapered shape such that the diameter increases from the front side to the rear side, and the rear end of the external cylinder 50 is formed to have a slightly larger diameter than the rear end (base end) of the blow-off pipe 12.

[0027] The front edge portion (opening at the front end face) of the external cylinder 50 extends to the rear edge portion of the blow-off pipe 12. Also, the outer surface of the rear edge portion (opening at the rear end face) of the external cylinder 50 contacts the inner surface of the rear portion of the main body 11. In other words, the external cylinder 50 is interposed between the blow-off pipe 12 and the suction port 15 formed at the rear portion of the main body 11.

[0028] Here, the blowing pipe 12 and the outer cylinder 50 are arranged concentrically, and are arranged so that their central axes coincide with each other.

[0029] An air passage 17 is formed by the blow-out pipe 12, the outer cylinder body 50, and the internal space at the rear of the main body 11. The air passage 17 is an air passage that extends approximately straight in the front-rear direction from the suction port 15 to the discharge port 16.

[0030] The motor case 20 is a resin container disposed within the housing 10. The motor case 20 is a cylindrical member, and is disposed in the center of the air passage 17 (on the rotation axis of the blower fan 40 described below). The rear end face of the motor case 20 opens in a circular shape, and the front end is closed in a conical shape.

[0031] The motor case 20 is disposed in the center of the front part of the external cylinder body 50. The front part (conical part) of the motor case 20 protrudes forward beyond the front end face of the external cylinder body 50. The motor case 20 is supported in the center of the external cylinder body 50 by a plurality of straightening plates 60, as shown in Figs. 3 and 4.

[0032] The rectifying plate 60 is interposed between the inner surface of the front part of the external cylinder body 50 and the outer surface of the motor case 20. The rectifying plate 60 is a rectangular plate-shaped member made of resin and extending in the radial direction of the air passage 17. The inner end of the rectifying plate 60 is connected to the outer peripheral surface of the motor case 20. Moreover, the outer end of the rectifying plate 60 is connected to the inner peripheral surface of the front part of the external cylinder body 50. In other words, the rectifying plate 60 is a support member interposed between the inner surface of the air passage 17 and the outer surface of the motor case 20.

[0033] The straightening vane 60 straightens the airflow in the air passage 17 (more specifically, the airflow sent out by the blower fan 40 downstream of the blower fan 40, which will be described later). The straightening vane 60 is also called a stator vane. In this embodiment, a plurality of straightening vanes 60 (five in the illustrated example) are disposed at equal intervals in the circumferential direction of the external cylinder body 50.

[0034] In this embodiment, the motor case 20, the rectifying plates 60 and the external cylinder body 50 are one integrally molded component. However, the motor case 20, the rectifying plates 60 and the external cylinder body 50 may be formed by assembling a plurality of components.

[0035] 3 and 4, the electric motor 30 is an electric motor, and is housed in the motor case 20. The electric motor 30 is disposed in the center (on the rotation axis of the blower fan 40 described below) of the air passage 17 (the outer cylinder body 50 or the motor case 20). The electric motor 30 is configured such that when a current is supplied to a coil of the main body 31, a rotating shaft 32 protruding from the main body 31 rotates around an axis O.

[0036] The main body 31 is fixed inside the motor case 20. With the main body 31 fixed inside the motor case 20, the rotating shaft 32 protrudes rearward beyond the rear end surface of the motor case 20.

[0037] The blower fan 40 is disposed behind the motor case 20 and inside the front part of the external cylinder body 50. The blower fan 40 includes a connecting portion 41 and a plurality of blade portions .

[0038] The connecting part 41 is a short cylindrical member and is formed to have approximately the same diameter as the motor case 20. The rear end face of the connecting part 41 is closed with a spherical surface (in other words, dome-shaped), and the front end face of the connecting part 41 is opened in a circular shape. A boss 43 is formed in the center of the connecting part 41, and an insertion hole 44 is formed in the boss 43, into which the rotating shaft part 32 of the electric motor 30 is inserted. The connecting part 41 is fixed to the rotating shaft part 32 of the electric motor 30 by fitting the rotating shaft part 32 of the electric motor 30 into the insertion hole 44 of the connecting part 41.

[0039] Furthermore, the connecting portion 41 rotates relative to the motor case 20 and forms a part of the motor case 20 as a rear case of the motor case 20 .

[0040] In the axial blower 1 of this embodiment, a plurality of blades 42 are arranged (protruding) on ​​the outer circumferential surface of the connecting portion 41. In this embodiment, a plurality of blades 42 (12 blades in the illustrated example) are arranged at equal intervals in the circumferential direction of the connecting portion 41. When the electric motor 30 is driven to rotate the rotating shaft 32 and the blower fan 40 around the axis O, each blade 42 blows air from the rear (upstream side) to the front (downstream side) in the air passage 17. That is, in the axial blower 1, as shown in Figs. 3 and 4, when the blower fan 40 rotates in the air passage 17 by the driving force of the electric motor 30, a high-speed air flow is generated from the upstream intake port 15 to the downstream discharge port 16. The blades 42 of the blower fan 40 are also called rotor blades. In detail, as shown in FIG. 6, when the blade portion (moving blade) 42 of the blower fan 40 rotates within the air passage 17 by the driving force of the electric motor 30, the high-speed air flowing downstream of the electric motor 30 flows while swirling inside the cylindrical blowing pipe 12.

[0041] In this embodiment, the electric motor 30 (its rotating shaft portion 32) and the blower fan 40 are arranged with their rotation axis O facing in the front-to-rear direction, and the rotation axis O of the electric motor 30 (its rotating shaft portion 32) and the blower fan 40 coincides with the central axis of the blower pipe 12, the outer cylinder body 50, and the motor case 20, and the blower passage 17 formed by the blower pipe 12, the outer cylinder body 50, etc. extends approximately straight in the direction of the rotation axis O of the blower fan 40.

[0042] In the axial flow blower 1, as shown in Figures 1, 2 and 3, a handle 70 is provided on the upper surface of the main body 11. The handle 70 is a cylindrical member extending in the front-rear direction and is a part that is gripped by an operator. The front and rear ends of the handle 70 are connected to the front and rear ends of the upper surface of the main body 11. A throttle lever 71 is provided at the front of the handle 70 as an operating means for increasing or decreasing the rotation of the rotating shaft 32 of the electric motor 30 when gripped by an operator.

[0043] A control case 80 is formed inside the front end portion of the handle 70 (the portion connected to the main body portion 11). A control device (not shown) is housed inside the control case 80, which controls the drive of the electric motor 30, i.e., the rotation of the blower fan 40, based on a signal from the throttle lever 71. A power cable (not shown) that is connected to a battery 75 as a power source is connected to the control device. In addition, the control device and the throttle lever 71 are connected by a signal cable (not shown) that is passed through the handle 70. A power supply cable (not shown) that is connected to the electric motor 30 is connected to the control device.

[0044] As shown in FIGS. 1, 2 and 3, in the axial flow blower 1, a battery 75 serving as a power source for the control device and the like is mounted on the rear surface of the main body 11 (on the upper part of the rear wall 18 that forms the rear surface).

[0045] When blowing away fallen leaves and dust with the axial blower 1, an operator holds the handle 70 with his / her hand and carries the axial blower 1. Then, by operating the throttle lever 71 of the handle 70 to rotate the blower fan 40, a high-speed air flow is generated in the air passage 17, and outside air (air) is taken in (from the side and below) from the suction port 15 (the side suction port 15A and the lower suction port 15B) into the air passage 17, and the air flow is blown onto the ground from the discharge port 16.

[0046] In addition to the above configuration, in the axial blower 1 of this embodiment, in order to increase the wind speed while suppressing a decrease in the volume of the airflow blown onto the ground from the outlet 16, the front end (tip) of the outlet pipe 12 forming the front part of the air passage 17 has a tapered shape consisting of a corner R (R part).

[0047] 5 and 6, a rounded portion (first rounded portion) 19a is provided at the front opening, i.e., the tip (downstream end) of the cylindrical blow-out pipe 12. The rounded portion 19a is formed around the entire circumference of the tip of the blow-out pipe 12 and is configured as a circular arc that is rounded on the outside.

[0048] In addition, the R portion (second R portion) 19b is provided (connected) continuously to the tip end (downstream end) of the R portion (first R portion) 19a. The R portion 19b is formed around the entire circumference of the tip end of the R portion 19a and is configured as an inwardly rounded arc. In this embodiment, the radius of the arc of the front R portion 19b is smaller than the radius of the arc of the rear R portion 19a.

[0049] Furthermore, a straight portion 19c is provided (connected) continuously to the tip (downstream end) of the R portion (second R portion) 19b. The straight portion 19c is a cylindrical portion extending in the front-rear direction (having a constant diameter in the front-rear direction). In this embodiment, the front opening (tip opening) of the straight portion 19c constitutes the discharge port 16.

[0050] In this embodiment, the R portion 19a, the R portion 19b, and the straight portion 19c are integrally formed with the blow-out pipe 12. However, the R portion 19a, the R portion 19b, and the straight portion 19c do not have to be integrally formed with the blow-out pipe 12.

[0051] As described above, by providing the R portion (first R portion) 19a, the air coming out of the outlet 16 is prevented from spreading in the circumferential direction of the blow-out pipe 12, so that the wind speed can be increased while suppressing a decrease in the air volume (see FIG. 6).

[0052] Furthermore, if the tip of the outlet pipe 12 is edged, there is a possibility that wind noise will occur. However, by providing the second R section 19b, the wind flowing straight through the outlet pipe 12 in the direction of the rotation axis O of the blower fan 40 and the wind guided by the first R section 19a to be slightly inclined inward can be smoothly joined together and then sent out, thereby effectively reducing noise.

[0053] Furthermore, by providing the straight portion 19c, the straightness of the airflow sent out from the outlet 16 can be maintained, so that the airflow speed can be increased more effectively.

[0054] In the above-mentioned configuration, the R-portion 19a, the R-portion 19b, and the straight portion 19c can be set arbitrarily, but if the R-portion 19a and the R-portion 19b are too large, the reduction in the air volume becomes large. Also, if the R-portion 19a is too small, it becomes difficult to obtain the effect of increasing the air velocity while suppressing the reduction in the air volume.

[0055] Therefore, in order to balance the decrease in air volume and the increase in air speed, it has been confirmed that the ratio (φDc / φD) of the aperture (inner diameter) φDc of the straight portion 19c to the aperture (inner diameter on the upstream side of the R portion 19a) φD of the tip of the blow-off pipe 12 is preferably set within a range of 70% to 90% (in other words, 70% or more and 90% or less). It has also been confirmed that the ratio (Ra / φDc) of the radius Ra of the arc of the first R portion 19a to the aperture (inner diameter) φDc of the straight portion 19c is preferably set within a range of 10% to 30% (in other words, 10% or more and 30% or less). In other words, it is preferable that the ratio (Ra / φD) of the arc radius Ra of the first R portion 19a to the diameter φD of the tip of the blow-off pipe 12 is set within the range of 7% to 27% (in other words, 7% or more and 27% or less), and the ratio (Rb / φD) of the arc radius Rb of the second R portion 19b to the diameter φD of the tip of the blow-off pipe 12 is set to less than 15%.

[0056] As an example, when the diameter (inner diameter on the upstream side of the R portion 19a) φD of the tip of the blowing pipe 12 is about 90 mm, it is preferable that the radius Ra of the arc of the first R portion 19a is 10 mm to 25 mm, and the radius of the arc of the second R portion 19b is less than 10 mm. Also, the length of the straight portion 19c is preferably about 0.5 mm to 5.0 mm, although it is not limited thereto.

[0057] It is not necessary for the blow-out pipe 12 to have all of the R portion 19a, the R portion 19b, and the straight portion 19c. For example, it may have only the R portion 19a, or only the R portion 19a and the R portion 19b. Also, the straight portion 19c may be provided continuously to the tip end (downstream end) of the R portion 19a without the R portion 19b.

[0058] As described above, the axial flow blower 1 of this embodiment is provided with the R portion (first R portion) 19a, which is formed of an arc with a rounded outward shape, at the tip of the straight blowout pipe 12. This prevents the air discharged from the outlet 16 from spreading in the circumferential direction of the blowout pipe 12, making it possible to increase the wind speed while suppressing a decrease in the air volume (see FIG. 6).

[0059] In addition, an R section (second R section) 19b consisting of an inwardly rounded arc is connected to the tip of the R section (first R section) 19a. As a result, if the tip of the blow-out pipe 12 is an edge, there is a possibility that wind noise will occur, but by providing the second R section 19b, the wind flowing straight through the blow-out pipe 12 in the direction of the rotation axis O of the blower fan 40 and the wind guided by the first R section 19a to be slightly inclined inward can be smoothly joined and sent out at the place where they join, so that noise can be effectively reduced.

[0060] In addition, the radius of the circular arc of the R portion (second R portion) 19b is smaller than the radius of the circular arc of the R portion (first R portion) 19a, thereby making it possible to effectively reduce noise with a relatively small change in shape.

[0061] In addition, a straight section with a constant diameter is connected to the tip of the R section (second R section) 19b. As a result, by providing the straight section 19c, the straightness of the airflow sent out from the outlet 16 can be maintained, and the airflow speed can be increased more effectively.

[0062] Further, a straightening vane 60 serving as a stator vane for straightening the flow of air sent out by the blower fan 40 is disposed downstream of the blower fan 40 serving as a moving vane, and the R portion 19a is disposed downstream of the straightening vane 60. As a result, by straightening the flow of air sent out by the blower fan 40 (moving vane) with the straightening vane 60 (stator vane), the flow of air guided by the tapered R portion 19a can be guided more smoothly.

[0063] As described above, according to the axial flow blower 1 of the present embodiment, by providing the R portion 19a at the tip of the blow-out pipe 12 provided in the housing 10, it is possible to effectively increase the wind speed while suppressing a decrease in the air volume.

[0064] Although an example of an embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and can be appropriately modified without departing from the spirit of the present invention.

[0065] For example, in the axial blower 1 of this embodiment, a removable blowing pipe 12 is attached to the opening of the main body 11, but the blowing pipe 12 does not have to be removable and may be formed integrally with the main body 11. [Explanation of symbols]

[0066] 1 Axial blower 10. Housing 11 Main body 12 Outlet pipe 13 Side intake port 14 Lower suction port 15 Intake port 16 Outlet 17 Air duct 18 Back wall 19a Part R (Part 1R) 19b Part R (Part 2R) 19c straight section 20 Motor case 30 Electric Motor 31 Main body 32 Rotating shaft 40 Blower fan (moving blade) 41 Connecting part 42 Wings 43 Boss 44 Insertion hole 50 Outer cylinder 60 Current plate (static vane) 70 Handle 71 Throttle lever 75 Battery 80 Control Case

Claims

1. a housing in which an inlet and an outlet are formed and in which an air passage is formed connecting the inlet and the outlet; an electric motor disposed within the housing; a blower fan connected to the electric motor and rotated in the air passage by a driving force of the electric motor to blow air from the suction port to the discharge port, The housing is provided with an outlet pipe that forms a part of the air passage extending in a direction of a rotation axis of the blower fan and has a tip opening that serves as the outlet port, The tip of the blowing pipe is provided with an R portion formed of an arc having a rounded outer side, The blowing pipe is a straight pipe, The R portion is a first R portion, and a second R portion is connected to a tip portion of the first R portion and is formed around the entire circumference of the tip portion of the first R portion and is configured as an inwardly rounded arc, a radius of the arc of the second R-portion is smaller than a radius of the arc of the first R-portion, A straight portion having a constant diameter is connected to the tip of the second R portion, 4. An axial flow blower, wherein a ratio of a diameter of the straight portion to a diameter of the tip portion of the blowing pipe is set within a range of 70% to 90%.

2. 2. The axial flow blower according to claim 1, wherein a ratio of a radius of the arc of the first R-portion to a diameter of the straight portion is set within a range of 10% to 30%.

3. 3. The axial blower according to claim 2, wherein a diameter of a tip of the blowing pipe is 90 mm, a radius of the arc of the first R portion is 10 mm to 25 mm, and a radius of the arc of the second R portion is less than 10 mm.

4. 4. The axial blower according to claim 1, wherein a straightening vane serving as a stationary vane for straightening the flow of air blown out by the blower fan is disposed downstream of the blower fan as a moving blade, and the R portion is disposed downstream of the straightening vane.

5. An axial blower as described in any one of claims 1 to 4, characterized in that a handle which is gripped by an operator is provided on the upper surface of the housing.

6. An axial blower as described in Claim 5, characterized in that a control device is housed inside the handle for controlling the drive of the electric motor and thereby controlling the rotation of the blower fan.

7. An axial blower as described in claim 6, characterized in that the control device is housed inside the front end of the handle.

8. An axial blower as described in any one of claims 1 to 7, characterized in that a battery serving as a power source is mounted on the rear surface of the housing.

Images