Blower nozzle

Abstract

To provide a blower nozzle excellent in working efficiency.SOLUTION: The blower nozzle 1 has a blower mounting port 2 mounted on a blower to blow out air from a wide blowout port 4, and includes a streamline type flow dividing blade 11 for dividing an air flow vertically entering from an opening surface of the blower mounting port 2 and going straight near a nozzle inner wall 13 at a front edge 12. In a cross-sectional view of a blower nozzle (1) including the opening surface long axis (La) of a blow-out opening (4) and a central axis (C) in the blowing direction, which passes through the center of the opening surface of a blower mounting opening (2) and is perpendicular to the opening surface, the angle of attack (α) of a blade shape and a leading edge (12) is set such that the speed of an air flow passing the surface of a dividing blade (11) is higher on the side (16) facing a nozzle inner wall (13) than on the side (18) not facing the inner wall (13).SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a blower nozzle. [Background technology]

[0002] Conventionally, blower nozzles with flat and wide outlets have been proposed and sold as components that can be attached to handheld blowers (air blowers) to improve the efficiency of blowing away fallen leaves and grass clippings, draining water from cars after washing, draining water from the bathroom after bathing, etc. (Patent Document 1, Patent Document 2).

[0003] Various improvements have been made to wide-shaped blower nozzles, including those that can be angled by 90° around the central axis of the airflow direction so that the outlet can remain parallel to the work surface even when the machine is turned sideways depending on the work environment (Patent Document 3, Patent Document 4), those that are fitted with a soft rubber protector to prevent the tip from coming into contact with the vehicle body and damaging the painted surface (Non-Patent Document 1), and those that are said to have internal blades to spread the air evenly (Non-Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Design Registration No. 1349171 [Patent Document 2] Design Registration No. 810854 [Patent Document 3] Japanese Patent Application Laid-Open No. 2009-264296 [Patent Document 4] Japanese Patent Application Laid-Open No. 2008-038686 [Non-patent literature]

[0005] [Non-Patent Document 1] Mercari, HIDE's request for two items (URL: https: / / jp.mercari.com / item / m27481638631) [Non-patent document 2] Mercari, ABS Makita Rechargeable Blower with Expanding Diffusion Nozzle, Hard Material [Car Wash Drainer] (URL: https: / / jp.mercari.com / item / m46392827266) Summary of the Invention [Problem to be solved by the invention]

[0006] However, with wide-shaped blower nozzles, the airflow tends to weaken toward both ends of the outlet, making it impossible to blow away water droplets over a wide area, and the sweeping range must overlap, so improvements in work efficiency are still insufficient. Furthermore, there are problems such as the inner surface accidentally being partially turned upside down when the object to be cleaned comes into contact with the protective member, or the protective member getting caught on something and shifting its position. Furthermore, the dimensions of the cutouts in the blower outlet vary slightly depending on the blower manufacturer or individual blower, resulting in problems with versatility, such as the blower nozzle not fitting properly when manufactured with high dimensional precision out of a relatively rigid plastic. Furthermore, whether the blower is held from above with one hand or with both hands, as in Patent Documents 3 and 4, blowers are commercially available from a variety of manufacturers, including several major manufacturers, and compatible models are also available. The position of the blower's air outlet pins varies slightly from manufacturer to manufacturer, which creates a problem when attaching a wide blower nozzle to all of these models, with the long axis of the opening not being precisely horizontal or perpendicular to the vertical direction. While issues of horizontality and verticality are merely a matter of error in practice, they are required for commercial viability in terms of aesthetic appeal when installed. Ensuring precise horizontality and verticality for all models, including compatible models, would require a vast range of variations. Therefore, in some cases, it may be preferable from the perspective of versatility to simply adjust the nozzle around the central axis of the airflow direction and fix it at any angle.

[0007] In view of the above-mentioned current situation, an object of the present invention is to provide a blower nozzle that is excellent in work efficiency. [Means for solving the problem]

[0008] One aspect of the present invention, which has been made to achieve the above object, is a blower nozzle that, when attached to a blower mounting port, emits air from a wide outlet. The blower nozzle includes streamlined diverting vanes that divide at their leading edges the airflow that enters perpendicularly through the opening of the blower mounting port and travels straight along the nozzle interior wall. The airfoil shape and leading edge angle of attack α are set so that, in a cross-sectional view including the longitudinal axis La of the opening of the outlet and the central axis C of the airflow direction passing through the center point of the opening of the blower mounting port and perpendicular to the opening, the airflow passing through the surface of the diverting vanes is faster on the side facing the nozzle inner wall than on the side not facing the nozzle inner wall. With this configuration, the diverting vanes create an effect in which the pressure on the side facing the nozzle inner wall is lower than on the side not facing the nozzle inner wall in a cross-sectional view, and the airflow is drawn into the spatial region surrounded by the nozzle inner wall and the diverting vanes. This allows air to be discharged with sufficient wind pressure even near both longitudinal ends of the outlet, improving work efficiency.

[0009] In the blower nozzle, it is preferable that the center line of the diverter vane be warped toward the side facing the nozzle inner wall with respect to the chord line. With this configuration, even when the angle of attack α of the leading edge of the diverter vane is small, the effect of lowering the pressure on the side facing the nozzle inner wall in cross section becomes more pronounced than on the side not facing the nozzle inner wall.

[0010] In the blower nozzle, the angle of attack α of the leading edge is preferably set within a range of (r1 / 4.205r2)*25° to (r1 / 4.205r2)*35°, where r1 is the ratio (L1 / L2) of the length (width) L1 of the outlet opening major axis La to the opening diameter L2 of the blower mounting opening, and r2 is the ratio (L3 / L2) of the distance L3 between the leading edges of a pair of diverter vanes to the opening diameter L2 of the blower mounting opening. With this configuration, the optimal angle of attack α for suppressing airflow separation and turbulence can be set depending on the extent to which the outlet is widened and the leading edge distance L3.

[0011] The blower nozzle preferably includes a cylindrical joint with a blower mounting port, a nozzle positioning ring, and a nozzle body with an outlet, the cylindrical joint having a male thread on its outer periphery for attachment to the nozzle body, the male thread mating with female threads formed on the nozzle positioning ring and the nozzle body's inner periphery, and the nozzle positioning ring and nozzle body are rotated toward each other at any position on the male thread to butt together and tighten, allowing the nozzle body's wide outlet to rotate around the cylindrical joint's airflow direction central axis C to the extent of the male thread and be fixed at any angle and distance from the blower mounting port. This configuration allows the nozzle body alone to be easily rotated around the airflow direction central axis and fixed at any angle without changing the orientation of the blower, which is preferable in terms of work efficiency and ease of handling.

[0012] It is preferable that the blower nozzle is a blower nozzle equipped with a protective member made of an elastic material that covers the periphery of the hard outlet, and that a first convex portion formed on the inner peripheral surface of the protective member covers the opening edge of the outlet, thereby preventing the opening edge from coming into direct contact with the object to be sprayed, and that a concave portion or a second convex portion formed on the inner peripheral surface of the protective member, separate from the first convex portion, is fitted into a convex portion or a concave portion formed on the outer surface of the nozzle body. According to this configuration, since the first convex portion covers the opening edge of the outlet, even if the object to be cleaned comes into contact with the protective member, a part of the inner peripheral surface is unlikely to turn inside out and spread outward, and the concave portion formed on the inner peripheral surface of the protective member prevents the object to be cleaned from coming into contact with the object to be cleaned. The first or second convex portion fits into the convex portion or concave portion formed on the outer surface of the nozzle body, which makes it easier to prevent the protective member from shifting from its attached position and from being turned up or falling off.

[0013] It is preferable that the blower nozzle have, on the inner periphery near the blower mounting port, alternating thickened portions and thinned portions starting from the opening edge and extending in the direction of airflow in. With this configuration, even if the blower nozzle is manufactured with high dimensional accuracy using a relatively rigid plastic, the thinned portions are prone to deformation, so even if the dimensions of the notch and / or L-shaped groove in the blower outlet vary slightly depending on the blower manufacturer or individual blower, the deformation will accommodate the dimensional errors, allowing the pair of pins in the thickened portions to fit snugly into the notch in the blower outlet or the pair of pins on the outer periphery to fit snugly into the L-shaped groove in the blower outlet, improving versatility. [Effects of the Invention]

[0014] The blower nozzle of the present invention can provide an excellent nozzle in at least one of the aspects of work efficiency, ease of handling, and versatility. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 2 is a front view of the blower nozzle according to the first embodiment. [Figure 2] FIG. 2 is a cross-sectional view of the blower nozzle according to the first embodiment. [Figure 3] FIG. 2 is a bottom view of the blower nozzle according to the first embodiment. [Figure 4] FIG. 10 is a front view of a blower nozzle according to a second embodiment. [Figure 5] 10A is a plan view of a protection member for a blower nozzle according to a second embodiment, FIG. 10B is a cross-sectional view taken along line AA, and FIG. [Figure 6] FIG. 10 is a front view of a nozzle body of a blower nozzle according to a second embodiment. [Figure 7] FIG. 10 is a bottom view of the blower nozzle according to the third embodiment. [Figure 8] FIG. 10 is a cross-sectional view taken along line CC of the blower nozzle according to the third embodiment. [Figure 9] FIG. 10 is a front view of a blower nozzle according to a fourth embodiment in which the overall nozzle length is minimized. [Figure 10]FIG. 10 is a front view of a joint of a blower nozzle according to a fourth embodiment. [Figure 11] FIG. 10 is a DD cross-sectional view of a nozzle positioning ring of a blower nozzle according to a fourth embodiment. [Figure 12] FIG. 10 is a DD cross-sectional view of a nozzle body of a blower nozzle according to a fourth embodiment. [Figure 13] A photo of the air outlet area of ​​a typical new blower. [Figure 14] A photo of the air outlet of a typical old-fashioned blower. DETAILED DESCRIPTION OF THE INVENTION

[0016] The following defines the terms used in this specification. In this specification, the "leading edge of the diverter vane" refers to the point at which the center line of the blade thickness (hereinafter also referred to as the "camber line") and the outer surface of the diverter vane intersect, when viewed from a cross section (hereinafter also referred to as the "blowing surface") that includes the long axis La of the opening surface of the outlet of the blower nozzle and the central axis of the air flow direction that passes through the center point of the opening surface of the blower mounting port and is perpendicular to the opening surface. In this specification, the "trailing edge of the diverter vane" means the point at which the mean camber line intersects with the outer surface of the diverter vane, the point being farther from the blower mounting port. In this specification, the term "chord line" means a straight line connecting the leading edge and the trailing edge. In this specification, the "angle of attack α" refers to the angle formed by the chord line with respect to a streamline (or central axis of the airflow direction) that passes through the center point of the opening surface of the blower mounting port and is perpendicular to the opening surface. In this specification, "hard" means that the modulus of elasticity is higher than that of the protective member. In this specification, the terms "thickened portion" and "thinned portion" simply refer to portions of the inner periphery near the blower attachment port that are thicker or thinner (relatively) than each other. Therefore, the wall thickness near the blower attachment port may be the same as, thicker than, or thinner than the wall thickness outside the blower attachment port.

[0017] (First embodiment) The blower nozzle 1 according to the first embodiment shown in FIGS. 1 and 2 has a shape in which a blower mounting port 2 is attached to a blower to blow in an airflow and a wide outlet port 4 from which the airflow is discharged.

[0018] The blower nozzle 1 according to this embodiment has a pair of outer wall pins 3 formed on its outer periphery 6 near the blower mounting port 2, facing each other. The outer wall pins 3 are generally cylindrical, with their cylindrical axes A1 and A2 coaxially defining a radial axis R1 perpendicular to the central axis C of the airflow direction. The outer wall pins 3 can be attached to the blower 54 shown in FIG. 13 by fitting into opposing L-shaped grooves 56 formed on the inner periphery of the blower 54 from the air outlet peripheral edge 55. The inner periphery 8 near the blower mounting port 2 is thickened, and a pair of inner wall pins 5 are formed in this thickened portion 7 facing each other. The inner wall pins 5, like the outer wall pins 3, are generally cylindrical, with their cylindrical axes A3 and A4 coaxially defining a radial axis R2 perpendicular to the central axis C of the airflow direction. The inner wall pin 5 can be attached to the blower 50 by fitting into an L-shaped notch 53 formed in the periphery 52 of the air outlet of an older model blower 50, as shown in Figure 14, which has a smaller air outlet diameter than the latest model. The angle between R1 and R2 is approximately 5°.

[0019] The blower nozzle 1 of this embodiment is provided with a pair of diverting blades 11 that divide the airflow moving straight near the wall surface inside the nozzle at a leading edge 12, at a position symmetrical with respect to a plane including the short axis of the opening surface of the outlet 4 and the central axis C of the airflow direction that passes through the center point of the opening surface of the blower mounting port 2 and is perpendicular to the opening surface.

[0020] The airfoil shape, surface smoothness, and angle of attack α of the diverter vane 11 in the blower nozzle 1 according to this embodiment are set so that the laminar state of the airflow is maintained even near the trailing edge 14 and no vortices or airflow separation occurs.

[0021] The airfoil shape of the diverter vane 11 in the blower nozzle 1 according to this embodiment is set so that the speed of the airflow passing over the surface of the diverter vane 11 is faster on a side 16 facing the nozzle inner wall 13 than on a side 18 not facing the nozzle inner wall 13, in a cross section including the major axis La of the opening surface of the outlet 4 and the central axis C of the airflow direction. The airfoil shape of the diverter vane 11 in this embodiment is streamlined, particularly, has a rounded leading edge 12 and a pointed trailing edge 14. Therefore, the thickness of the diverter vane 11 is non-uniform from the leading edge 12 to the trailing edge 14, and the center line of the thickness is warped toward the side 16 facing the nozzle inner wall 13 with respect to the chord line.

[0022] The angle of attack α of the leading edge 12 in the blower nozzle 1 of this embodiment is set so that the speed of the airflow passing through the surface of the diverter vane 11 is faster on the side 16 facing the nozzle inner wall 13 than on the side 18 not facing it, in a cross-sectional view including the long axis La of the opening surface of the outlet 4 and the central axis C of the airflow direction. As a result of various experiments and studies conducted by the inventors, it was found that the angle of attack α tends to be smaller when the length (width) of the opening surface major axis La of the outlet 4 is narrow, tends to be larger when it is wider, tends to be larger when the diverter vane 11 is located further inward, and tends to be smaller when it is located further outward. Therefore, based on experience, the angle of attack α is typically set within the range of (r1 / 4.205r2)*25° to (r1 / 4.205r2)*35° under typical wind speed conditions for commercially available blowers, where r1 is the ratio (L1 / L2) of the length (width) L1 of the opening major axis La of the nozzle outlet 4 to the opening diameter L2 of the blower mounting port 2, and r2 is the ratio (L3 / L2) of the distance L3 between the leading edges of the pair of diverter vanes 11 to the opening diameter L2 of the blower mounting port 2. A more preferable upper limit for the angle of attack α is (r1 / 4.205r2)*33° to suppress the occurrence of airflow separation and turbulence. A more preferable lower limit for the angle of attack α is (r1 / 4.205r2)*27° to avoid weakening the wind near both ends of the nozzle outlet.

[0023] In the blower nozzle 1 according to this embodiment, L1=185 mm, L2=40 mm, and L3=44 mm, so the angle of attack α is set in the range of 25° to 35°.

[0024] (Second embodiment) The difference between the first embodiment and the second embodiment of the blower nozzle 21 shown in Figures 4, 5 and 6 is that a protective member 22 is attached to cover the hard peripheral edge 29 of the outlet of the nozzle body 26, and the underside 31 of a first protrusion 23 formed in a canopy-like shape around the inner surface 28 of the protective member 22 abuts against the opening edge 24 of the outlet 4, preventing the opening edge 24 from coming into direct contact with the object to be sprayed, and a second protrusion 25 formed in a ridge-like shape around the inner circumference 28 of the protective member 22 below the first protrusion 23 fits into a recess 27 formed in the outer surface of the nozzle body 26.

[0025] As shown in FIG. 5(a), the protective member 22 has a size that allows it to cover the outlet peripheral edge 29, and is provided with two bridge portions 30 for maintaining its shape.

[0026] The protective member 22 is made of a TPU elastomer, which has relatively low elasticity and high dimensional accuracy compared to latex, which is used in rubber bands. It can also be made of ordinary rubber (such as silicone rubber, styrene rubber, or butadiene rubber).

[0027] (Third embodiment) The difference between the blower nozzle 41 according to the third embodiment shown in Figures 7 and 8 and the first embodiment is that the inner circumference 8 near the blower mounting port 2 has thickened portions 47 and thinned portions 48 that start from the opening edge 45 and extend in the airflow inflow direction, alternating along the circumferential direction. In this embodiment, a pair of opposing wide, thickened portions 50a having inner wall pins 5 formed on their upper surfaces are alternately arranged in the circumferential direction with thinned portions 48 and narrow, thickened portions 50b having no pins on their upper surfaces, and have the same width.

[0028] The 14 thinned portions 48 have the same thickness as the wall thickness other than in the vicinity of the blower mounting port 2, and have the property of being relatively more easily deformed than the thickened portion 47, which is made by compressing the outer periphery 6 in the vicinity of the blower mounting port 2. The ratio of the width of the thinned portion 48 to the width of the narrow thickened portion 50b is usually in the range of 4:5 to 3:2, depending on the material and the required strength, and is set to 1:1 in this embodiment. The ratio of the thickness of the thinned portion 48 to the thickness of the thickened portion 47 depends on the material and the required strength, but is usually in the range of 2:3 to 1:3, and in this embodiment it is 1:2.

[0029] (Fourth embodiment) The difference between the blower nozzle 61 of the fourth embodiment shown in Figure 9 and the second embodiment is that the fourth embodiment comprises a cylindrical joint 62 having a blower mounting port, a nozzle positioning ring 64, and a nozzle body 66 having an outlet 4, which are detachable from one another. The outer wall surfaces of the nozzle positioning ring 64 and nozzle body 66 shown in Figure 9 near the joint mounting port are thick, and the thick portions 57, 67 have inverted trapezoidal grooves 59, 69 formed at 22 regular intervals. 10 has a male screw 78 formed on its outer periphery 76 for attachment to a nozzle body 66. The shape of the threads of the male screw 78 is generally a crest-valley shape when viewed in any cross section including the central axis C in the air blowing direction. 11 and 12, female threads 79, 80 are formed on the inner peripheries 38, 58 near the joint attachment ports of the nozzle positioning ring 64 and the nozzle body 66. The shape of the female threads 79, 80 is a peak-valley shape that is roughly congruent with the male thread 78 when viewed in any cross section including the central axis C in the airflow direction. Male threads 78 formed on the cylindrical joint 62 and female threads 79, 80 formed on the inner periphery 68 of the nozzle positioning ring 64 and the nozzle body 66 near the joint mounting opening are adapted to mate with each other.

[0030] To use the nozzle positioning ring, first engage the pair of pins 3 formed on the outer periphery 76 of the cylindrical joint 62 or the pair of pins 5 formed on the inner periphery 8 with the grooves or notches in the blower outlet. Next, engage the female threads 79 of the nozzle positioning ring 64 with the male threads 78 of the cylindrical joint 62, and screw the nozzle positioning ring 64 clockwise while placing your fingers against the grooves 59 until it reaches the bottom of the male threads 78. Next, engage the female threads 80 of the nozzle body 66 with the male threads 78 of the cylindrical joint 62, and screw the ring 64 clockwise while placing your fingers against the grooves 69. When the total nozzle length (the shortest distance from the opening of the blower mounting port to the opening of the outlet 4) reaches the desired length and the major axis La of the opening of the outlet 4 reaches the desired angle with respect to the vertical plane including the blower handle, stop screwing the nozzle body 66 in and turn the nozzle positioning ring 64 counterclockwise until the nozzle positioning ring 64 is abutted against the thick-walled portion 57 of the nozzle body 66 and tightened. This allows the wide outlet 4 of the nozzle body 66 to be fixed at a desired angle and over the entire nozzle length.

[0031] The blower nozzle 61 according to the above-described embodiments can be manufactured using commercially available 3D CAD software and a 3D printer. Specific molding methods that can be used include optical molding, material extrusion, and material jetting, but in this embodiment, material extrusion is used. Specific materials for the nozzle body 66, nozzle positioning ring 64, and cylindrical joint 62 can be selected from polycarbonate (PC), polypropylene (PP), acrylonitrile / butadiene / styrene copolymer (ABS), acrylonitrile-styrene-acrylate (ASA), thermoplastic polyurethane elastomer (TPU), polycarbonate-acrylonitrile / butadiene / styrene copolymer (PC-ABS), polylactic acid (PLA), nylon, glycol-modified polyethylene terephthalate (PETG), photocurable resin, etc., depending on the modeling method. In this embodiment, PETG is used because of its ease of availability and performance.

[0032] The embodiments of the present invention are not limited to the above-described embodiments, and not all of the configurations described in the above-described embodiments are essential requirements of the present invention. The present invention may be modified in various ways within the scope of the technical concept thereof. For example, in the first embodiment, the airfoil shape, surface smoothness, and angle of attack α of the diverter vane 11 are set so that the laminar state of the airflow is maintained near the trailing edge 14 and so that vortices and airflow separation do not occur. However, even if a vortex occurs near the trailing edge 14 of the diverter vane 11, if the vortex separates from the diverter vane 11 and flows toward the outlet 4, the vortex itself can repel water droplets, and this is acceptable. In the second embodiment, the second protrusion 25 is formed on the inner periphery 28 of the protective member 22. However, instead of this, a first recess of any shape may be formed. In this case, it is preferable to form a protrusion on the outer surface of the nozzle body 26 that is shaped to fit into the first recess. In the third embodiment described above, thinned portion 48 has the same thickness as the wall thickness other than in the vicinity of the blower mounting port, and thickened portion 47 is made twice as thick as thinned portion 48. However, instead of this, in a blower nozzle having a uniform wall thickness, only the inner circumference 8 in the vicinity of the blower mounting port may be thinned like grooves that are parallel to each other along the inflow direction of the airflow, so that the grooved portions correspond to thinned portion 48 and the portions other than the grooved portions correspond to thickened portion 47. In the fourth embodiment, the shape of the thread of the male screw 78 is triangular (triangular thread), but it may be a trapezoidal thread, a square thread, a sawtooth thread, etc. Furthermore, the shape of the thread of the corresponding female screws 79, 80 does not necessarily have to be congruent with that of the male screw 78. In the above embodiment, the number of bridge portions 30, the number of grooves 59, 69 in the thick portions 57, 67, etc. are all optional. [Industrial Applicability]

[0033] The blower nozzle according to the present invention makes draining work more efficient and is therefore suitable for a variety of uses where water droplets may remain after washing with water, such as car wash services at gas stations, cleaning services for the exterior glass of buildings, and cleaning services for areas around water such as bathtubs and sinks, and has great industrial applicability. [Explanation of symbols]

[0034] 1, 21, 41, 61 Blower nozzle 2 Blower mounting port 3 Exterior wall pins 4 Air outlet 5 Inner wall pin 6, 76 perimeter 7, 57, 67 Thick part 8, 38, 58, 68 (Nozzle) inner circumference 11 Diversion wing 12 leading edge 13 Nozzle inner wall 14 Trailing edge 16 Airflow on the facing side 18 Airflow on the opposite side 22 Protective material 23 First convex part 24 Opening edge 25 Second convex part 26, 66 nozzle body 27 Recess 28 Inner surface of protective member 29 Outlet periphery 30 Crosslinked part 31 Underside of first convex portion 45 Opening edge 47 Thickened area 48 Thinned parts 50a Wide and thickened section 50b Narrow thickened part 51 Old-fashioned blower 52, 55 Air outlet periphery 53 L-shaped notch 54 New Blower 56 L-shaped inner groove 59, 69 Groove 62 Cylindrical joint 64 Nozzle positioning ring 78 Male thread 79,80 Female thread

Claims

1. This blower nozzle has a blower mounting port attached to a blower and blows air from a wide outlet. It is equipped with streamlined flow dividing blades that divide the airflow that enters vertically from the opening surface of the blower mounting port and travels straight along the nozzle inner wall at the leading edge. A blower nozzle in which the blade shape and the angle of attack α of the leading edge are set so that, in a cross-sectional view including the long axis La of the opening surface of the outlet and the central axis C of the airflow direction that passes through the center point of the opening surface of the blower mounting port and is perpendicular to the opening surface, the airflow passing through the surface of the diverting blade is faster on the side facing the nozzle inner wall than on the side not facing the nozzle.

2. 2. The blower nozzle according to claim 1, wherein the center line of the blade thickness of the flow dividing vane is warped toward the side facing the nozzle inner wall with respect to the chord line.

3. The angle of attack α of the leading edge is the ratio (L1 / L2) of the length (width) L1 of the opening surface major axis La of the outlet to the opening diameter L2 of the blower mounting port. １ The ratio (L3 / L2) of the distance L3 between the leading edges of a pair of diverter blades to the opening diameter L2 of the blower mounting port is defined as r ２ As such, (r １ / 4.205r ２ ) * 25° ~ (r １ / 4.205r ２ 2. The blower nozzle of claim 1, wherein the angle is set within the range of 1 / 35°.

4. 2. The blower nozzle of claim 1, comprising a cylindrical joint having a blower mounting port, a nozzle positioning ring, and a nozzle body having an outlet port, The cylindrical joint has a male thread on its outer periphery for attachment to the nozzle body, and this male thread fits into female threads formed on the inner periphery of the nozzle positioning ring and the nozzle body. By rotating the nozzle positioning ring and the nozzle body in a direction approaching each other at any position on the male thread and butting them together and tightening them, the wide outlet of the nozzle body can be rotated around the airflow direction central axis C of the cylindrical joint to the extent that the male thread is formed, and the blower nozzle can be fixed at any angle and distance from the blower mounting port.

5. A blower nozzle equipped with a protective member made of an elastic material that covers the periphery of a hard outlet, The first protrusion formed on the inner circumferential surface of the protective member covers the opening edge of the outlet, thereby preventing the opening edge from directly contacting the target to be sprayed, 2. The blower nozzle according to claim 1, wherein a recess or a second protrusion formed on the inner peripheral surface of the protective member, separate from the first protrusion, is fitted into a protrusion or a recess formed on the outer surface of the nozzle body.

6. 2. The blower nozzle according to claim 1, wherein the inner periphery near the blower mounting opening has thickened portions and thinned portions extending from the opening edge along the inflow direction of the airflow, alternating along the circumferential direction.

Images