Blower

Abstract

This specification discloses a blower. The blower applies a technology capable of suppressing noise generated when air flows in the nozzle pipe. The blower has: a fan; a housing that has an outlet and houses the fan; and a nozzle that can be installed at the outlet. The nozzle has: a nozzle pipe through which air flows inside; and a plate member disposed inside the nozzle pipe. The rear end surface of the plate member is inclined with respect to the flow direction of air flowing inside the nozzle pipe.

Description

Technical Field

[0001] The technology disclosed in this specification relates to a blower. Background Art

[0002] Patent Document 1 discloses a blower. The blower has a fan, a housing, and a nozzle. The housing has an outlet and houses the fan. The nozzle can be attached to the outlet. The nozzle has a nozzle tube through which air flows inside.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2014 - 148951 Summary of the Invention

[0006] Problems to be Solved by the Invention

[0007] In the above blower, when an operator inserts a hand through the front opening of the nozzle tube, in order to prevent the hand from touching the housing, a proximity prevention member having a plate member is sometimes disposed inside the nozzle tube. However, if a plate member is disposed inside the nozzle tube, noise sometimes occurs when air flows through the nozzle tube. In this specification, a technology capable of suppressing noise generated when air flows in the nozzle tube is disclosed.

[0008] Solution to the Problem

[0009] This specification discloses a blower. The blower has: a fan; a housing that has an outlet and houses the fan; and a nozzle that can be attached to the outlet. The nozzle has: a nozzle tube through which air flows inside; and a plate member disposed inside the nozzle tube. The rear end surface of the plate member is inclined with respect to the flow direction of air flowing inside the nozzle tube.

[0010] The air flowing into the nozzle tube flows around the plate member. Thereby, a turbulent flow is generated. When the rear end surface of the plate member is not inclined with respect to the plane orthogonal to the flow direction, since a turbulent flow is generated, noise sometimes occurs in a relatively narrow specific frequency range. In the above structure, since the rear end surface of the plate member is inclined with respect to the flow direction, it is possible to change the position and distribution where the turbulent flow is generated in the flow direction. Thereby, generation of noise can be suppressed.

[0011] In addition, this specification discloses a blower. The blower has: a fan; a housing that has an outlet and houses the fan; and a nozzle that can be attached to the outlet. The nozzle has: a nozzle tube through which air flows inside; and a plate member disposed inside the nozzle tube. The plate member has a slit that penetrates the plate member in the flow direction of the air flowing inside the nozzle tube.

[0012] In the case where the plate member does not have a slit, since turbulent flow is generated, noise may be generated in a relatively narrow specific frequency range. In the above structure, since the plate member has a slit, the air flows not only around the plate member but also through the slit. Compared with the case where the plate member does not have a slit, it is possible to change the position and distribution where turbulent flow is generated. Thereby, generation of noise can be suppressed. Description of the Drawings

[0013] Figure 1 It is a perspective view of the blower 2 of the first embodiment.

[0014] Figure 2 It is a longitudinal sectional view near the motor 70 of the blower 2 of the first embodiment.

[0015] Figure 3 It is a cross-sectional view of the blower 2 of the first embodiment.

[0016] Figure 4 It is a cross-sectional view of the nozzle 80 of the first embodiment.

[0017] Figure 5 It is a rear view of the nozzle 80 of the first embodiment.

[0018] Figure 6 It is a sectional perspective view near the rear end face 84a of the proximity prevention member 84 in the nozzle 80 of the first embodiment.

[0019] Figure 7 It is a perspective view of the blower 102 of the second embodiment.

[0020] Figure 8 It is a cross-sectional view of the blower 102 of the second embodiment.

[0021] Figure 9 It is a cross-sectional view of the nozzle 80 of the third embodiment.

[0022] Figure 10 It is a cross-sectional view of the nozzle 80 of the fourth embodiment.

[0023] Description of Reference Numerals

[0024] 2, 102, blower; 4, 104, housing; 6, 106, main housing; 14, 114, handle; 24, 124, trigger; 32, housing; 34, volute; 40, fan storage chamber; 42, 142, air flow path; 60, motor storage chamber; 62, air inlet; 64, 164, discharge port; 70, 170, motor; 70a, 170a, shaft; 72, control board; 74, 174, fan; 80, nozzle; 82, nozzle pipe; 84, approach prevention member; 84a, 92a, 94a, rear end face; 88, noise suppression mechanism; 92, central plate member; 94, outer plate member; 98, notch; 176, stator vane; 286, slit; B, battery pack. Detailed Description of the Invention

[0025] The following describes representative and non - limiting specific examples of the present invention in detail with reference to the accompanying drawings. This detailed description is only intended to show those skilled in the art the details of the preferred examples for implementing the present invention, and is not intended to limit the scope of the present invention. Additionally, the disclosed additional features and technical solutions can be used separately or jointly with other features and technical solutions to provide a further improved blower.

[0026] Furthermore, the combination of features and processes disclosed in the following detailed description is not necessarily required in the broadest sense when implementing the present invention, and is only described to specifically illustrate representative specific examples of the present invention. And when providing additional and useful embodiments of the present invention, the various features of the following representative specific examples and the various features recited in the claims do not have to be combined in the specific examples or the recited order as described herein.

[0027] All features described in this specification and / or claims are intended to be defined separately from the structures of the features described in the embodiments and / or claims as limitations on the disclosure of the original application and the specific matters recited in the claims, and are disclosed separately and independently of each other. And all numerical ranges and descriptions related to organizations or groups are intended to disclose their intermediate structures as limitations on the disclosure of the original application and the specific matters recited in the claims.

[0028] In one or more embodiments, it may be that the rear end face of the plate member is located on the upstream side in the flow direction as it goes toward the inner side in the radial direction of the nozzle pipe.

[0029] In the above structure, when the rear end face of the plate member is more located on the upstream side in the flow direction as it gets closer to the inner side in the radial direction of the nozzle pipe, it is possible to change the position and distribution of the generation of turbulent flow in the flow direction in the radial direction of the nozzle pipe. Thereby, the generation of noise can be further suppressed.

[0030] In one or more embodiments, it may also be that the rear end surface of the plate member is located on the downstream side in the flow direction as it goes toward the inner side in the radial direction of the nozzle tube.

[0031] In the above structure, when the rear end surface of the plate member is more located on the downstream side in the flow direction as it gets closer to the inner side in the radial direction of the nozzle tube, the position and distribution where turbulence is generated in the flow direction can be changed in the radial direction of the nozzle tube. Thereby, generation of noise can be further suppressed.

[0032] In one or more embodiments, it may also be that the rear end surface of the plate member is inclined at an angle of 30 degrees or more and 85 degrees or less with respect to the flow direction.

[0033] When the rear end surface of the plate member is inclined at an angle less than 30 degrees with respect to the flow direction, the strength of the plate member is insufficient. In addition, when the rear end surface of the plate member is inclined at an angle greater than 85 degrees with respect to the flow direction, generation of noise cannot be sufficiently suppressed. In the above structure, the strength of the proximity member can be ensured, and generation of noise can be suppressed.

[0034] In one or more embodiments, it may also be that the plate member has a notch.

[0035] In the above structure, by the simple structure of providing a notch in the plate member, the position and distribution where turbulence is generated are changed, and generation of noise can be suppressed.

[0036] In one or more embodiments, it may also be that the plate member has a recess.

[0037] In the above structure, by the simple structure of providing a recess in the plate member, the position and distribution where turbulence is generated are changed, and generation of noise can be suppressed.

[0038] In one or more embodiments, it may also be that a portion with a surface roughness of 0.1 or more is formed on the plate member.

[0039] When a portion with a surface roughness of 0.1 or more is not formed on the plate member, generation of noise cannot be sufficiently suppressed. In the above structure, the position and distribution where turbulence is generated are changed, thereby generation of noise can be suppressed.

[0040] In one or more embodiments, it may also be that the width of the plate in the flow direction is 10% or more of the inner diameter of the nozzle tube.

[0041] When the width of the plate member is less than 10% of the inner diameter of the nozzle tube, the strength of the plate member is insufficient. In the above structure, the strength of the plate member can be ensured.

[0042] In one or more embodiments, when observing the nozzle in the flow direction, the thickness of the plate member may be 1% or more and 8% or less of the inner diameter of the nozzle tube.

[0043] When the thickness of the plate member is less than 1% of the inner diameter of the nozzle tube, the strength of the plate member is insufficient. In addition, when the thickness of the plate member is greater than 8% of the inner diameter of the nozzle tube, the flow path resistance in the nozzle tube becomes large. In the above structure, the strength of the plate member can be ensured, and the excessive flow path resistance of the nozzle tube can be suppressed.

[0044] (First Embodiment)

[0045] Refer to Figures 1 to 6 , and the blower 2 of the first embodiment will be described. The blower 2 is a handheld blower. The blower 2 can blow up fallen leaves on the ground and the like. Hereinafter, the direction in which the shaft 70a of the motor 70 (refer to Figure 2 ) extends will be referred to as the left-right direction, the direction orthogonal to the left-right direction will be referred to as the front-rear direction, and the direction orthogonal to the left-right direction and the front-rear direction will be referred to as the up-down direction.

[0046] As Figure 1 shown, the blower 2 includes a housing 4, leg members 16, a plurality (two in this embodiment) of battery packs B, a trigger 24, and a main power switch 26. As Figure 2 shown, the housing 4 includes a left housing 4a that defines the outer shape of the left half of the housing 4 and a right housing 4b that defines the outer shape of the right half of the housing 4.

[0047] As Figure 1 shown, the housing 4 includes a main housing 6, side housings 8, a front connection portion 10, a rear connection portion 12, and a handle 14. The side housings 8 are fixed to the left side surface of the main housing 6 by screws.

[0048] The front connection portion 10 extends upward from the upper front side of the main housing 6. The rear connection portion 12 extends upward from the upper rear side of the main housing 6. The handle 14 extends from the upper rear side of the front connection portion 10 to the upper front side of the rear connection portion 12. The handle 14 is disposed on the upper side of the main housing 6. The handle 14 is held by the operator. The leg members 16 are fixed to the lower portion of the main housing 6. When the blower 2 is placed on the ground, only the leg members 16 are in contact with the ground.

[0049] Two battery packs B are detachably mounted on the front surface of the main housing 6. The two battery packs B are electrically connected in series. In addition, in a modified example, the two battery packs B may be electrically connected in parallel. The battery pack B includes, for example, a lithium-ion battery.

[0050] The trigger 24 is mounted on the handle 14. The trigger 24 is pressed by the finger of the hand of the operator holding the handle 14.

[0051] The main power switch 26 is disposed on the middle plane 28. The middle plane 28 is disposed near the left side surface of the housing 4 and faces upward. The main power switch 26 is operated by a hand of the operator different from the hand holding the grip handle 14. The main power switch 26 is a switch for switching between the on state and the off state of the blower 2. When the blower 2 is in the off state, the rotation of the motor 70 described later is prohibited. In this case, even if the trigger 24 is pushed in, the motor 70 does not rotate. On the other hand, when the blower 2 is in the on state, the rotation of the motor 70 is permitted. In this case, when the trigger 24 is pushed in, the motor 70 rotates.

[0052] As Figure 2 shown, the housing 4 has a housing 32 and a volute 34. The housing 32 has a fan accommodation chamber 40 inside. The volute 34 is integrally formed with the housing 32. The volute 34 is disposed on the outer side in the radial direction of the housing 32 in the radial direction of the central axis AX extending in the left-right direction. As Figure 3 shown, the volute 34 has an air flow path 42 inside for air to flow. The air flow path 42 communicates with the fan accommodation chamber 40. The air flow path 42 extends in a spiral around the central axis AX. The air flow path 42 communicates with the outside of the blower 2 via the discharge port 64 of the volute 34.

[0053] As Figure 2 shown, the housing 4 has a motor accommodation chamber 60 and a suction port 62. The motor accommodation chamber 60 is demarcated by the main housing 6 and the side housing 8. The motor accommodation chamber 60 is disposed on the left side of the fan accommodation chamber 40. The suction port 62 is disposed on the right side surface of the housing 32 in the right housing 4b. The suction port 62 penetrates the right side surface of the housing 32. The suction port 62 communicates with the fan accommodation chamber 40. The suction port 62 is covered by a cover 68. A plurality of small openings are formed in the cover 68.

[0054] The blower 2 further has a motor 70, a control board 72, a fan 74, and a blade 76. The motor 70 and the control board 72 are disposed in the motor accommodation chamber 60. The motor 70 is a prime mover, for example, a brushless motor. In addition, in a modified example, the motor 70 may also be an engine or a brushed motor. The motor 70 rotates using the power of two battery packs B. The control board 72 controls the rotation of the motor 70 according to the operation of the trigger 24.

[0055] The fan 74 and the blade 76 are arranged in the fan storage chamber 40. The fan 74 is fitted near the right end portion of the shaft 70a of the motor 70. The fan 74 is a centrifugal fan. The blade 76 is fitted to the shaft 70a at a position to the right of the fan 74. When the motor 70 rotates, the fan 74 and the blade 76 rotate about the central axis AX. Thereby, air flows into the fan storage chamber 40 through the air inlet 62. Dust (such as fallen leaves and small stones) that has invaded the fan storage chamber 40 together with the air is crushed by the blade 76. The air flowing into the fan storage chamber 40 is sent by the fan 74 to the outside in the radial direction of the central axis AX.

[0056] As Figure 1 shown, a nozzle 80 is detachably mounted at the air outlet 64 of the volute 34. As Figure 4 shown, the nozzle 80 has a nozzle tube 82 and a proximity prevention member 84. The nozzle tube 82 has a substantially cylindrical shape extending in the longitudinal direction. The air passing through the air outlet 64 flows inside the nozzle tube 82. The proximity prevention member 84 is integrally formed with the nozzle tube 82. The proximity prevention member 84 is arranged inside the nozzle tube 82. When an operator inserts a hand through the front end opening of the nozzle tube 82, the proximity prevention member 84 inhibits the hand from touching the housing 4 (see Figure 3 ). The proximity prevention member 84 is arranged near the center in the longitudinal direction of the nozzle tube 82. Further, in a direction orthogonal to the flow direction of the air flowing inside the nozzle tube 82 (i.e., the direction from the rear end portion of the proximity prevention member 84 toward the front end portion), the length L1 of the proximity prevention member 84 is the same as the inner diameter D1 of the nozzle tube 82. The length L1 of the proximity prevention member 84 and the inner diameter D1 of the nozzle tube 82 are 82 mm.

[0057] The proximity prevention member 84 has four central plate members 92 and four outer plate members 94. The four central plate members 92 and the four outer plate members 94 are integrally formed. The sides of the four central plate members 92 and the sides of the four outer plate members 94 are arranged along the flow direction. The four central plate members 92 are arranged at positions radially inward of the four outer plate members 94 with respect to the nozzle tube 82. As Figure 5As shown, when observing the approach prevention member 84 in the flow direction, the four central plate members 92 are connected at an angle of 90 degrees to each other. The shape formed by connecting the four central plate members 92 has a substantially quadrilateral shape. The four outer plate members 94 extend from the corners of the quadrilateral formed by connecting the four central plate members 92 to the inner surface of the nozzle tube 82. The four outer plate members 94 are arranged at intervals of 90 degrees from each other in the circumferential direction of the inner peripheral surface of the nozzle tube 82. The respective thicknesses T1 of the central plate member 92 and the outer plate member 94 are the same. The respective thicknesses T1 of the central plate member 92 and the outer plate member 94 are 1 mm or more and 5 mm or less. In the present embodiment, the respective thicknesses T1 of the central plate member 92 and the outer plate member 94 are 2 mm. In addition, the respective thicknesses T1 of the central plate member 92 and the outer plate member 94 are 1% or more and 8% or less of the inner diameter D1 of the nozzle tube 82. In the present embodiment, the respective thicknesses T1 of the central plate member 92 and the outer plate member 94 are 2.5% of the inner diameter D1 of the nozzle tube 82.

[0058] As Figure 4 shown, in the flow direction, the respective widths W1 of the central plate member 92 and the outer plate member 94 are the same. The respective widths W1 of the central plate member 92 and the outer plate member 94 are 10 mm or more. In the present embodiment, the respective widths W1 of the central plate member 92 and the outer plate member 94 are 15 mm. In addition, the respective widths W1 of the central plate member 92 and the outer plate member 94 are 10% or more of the inner diameter D1 of the nozzle tube 82. In the present embodiment, the respective widths W1 of the central plate member 92 and the outer plate member 94 are 18% of the inner diameter D1 of the nozzle tube 82. In addition, in a modified example, the respective widths W1 of the central plate member 92 and the outer plate member 94 may also be 20% or more of the inner diameter D1 of the nozzle tube 82.

[0059] The rear end surface 84a of the approach prevention member 84 is constituted by the rear end surface 92a of the central plate member 92 and the rear end surface 94a of the outer plate member 94. The rear end surface 92a of the central plate member 92 and the rear end surface 94a of the outer plate member 94 are inclined with respect to the flow direction. In addition, the inclination means that an angle greater than 0 degrees is formed with respect to the flow direction, and an angle greater than 0 degrees is formed with respect to a plane orthogonal to the flow direction. The rear end surface 92a of the central plate member 92 and the rear end surface 94a of the outer plate member 94 are not parallel to the plane orthogonal to the flow direction and are inclined with respect to the plane orthogonal to the flow direction.

[0060] As Figure 6As shown, in the flow direction, the central portion 92b of the rear end face 92a of the central plate member 92 is located at the most upstream position, and the both end portions 92c of the rear end face 92a of the central plate member 92 are located at the most downstream position. Further, the central portion 92b refers to the center in the longitudinal direction of the rear end face 92a of the central plate member 92 when observing the approach prevention member 84 in the flow direction, and the both end portions 92c refer to both ends in the longitudinal direction of the rear end face 92a of the central plate member 92 when observing the approach prevention member 84 in the flow direction. The central portion 92b of the rear end face 92a of the central plate member 92 is located at the innermost position in the radial direction of the inner surface of the nozzle tube 82, and the both end portions 92c of the rear end face 92a of the central plate member 92 are located at the outermost position in the radial direction of the inner surface of the nozzle tube 82. The rear end face 92a of the central plate member 92 is located on the upstream side in the flow direction (i.e., on the discharge port 64 side) as it goes toward the inner side in the radial direction of the nozzle tube 82. The rear end face 92a of the central plate member 92 forms the noise suppression mechanism 88. The rear end face 92a of the central plate member 92 is inclined at an angle of 30 degrees or more and 85 degrees or less with respect to the flow direction (i.e., at an angle of 5 degrees or more and 60 degrees or less with respect to the plane orthogonal to the flow direction). In the present embodiment, the rear end face 92a of the central plate member 92 is inclined at an angle of 60 degrees with respect to the flow direction (i.e., at an angle of 30 degrees with respect to the plane orthogonal to the flow direction). Further, preferably, the rear end face 92a of the central plate member 92 is inclined at an angle of 40 degrees or more and 80 degrees or less with respect to the flow direction (i.e., at an angle of 10 degrees or more and 50 degrees or less with respect to the plane orthogonal to the flow direction).

[0061] As Figure 4 shown, the rear end face 94a of the outer plate member 94 is located on the upstream side in the flow direction as it goes toward the inner side in the radial direction of the nozzle tube 82. The rear end face 94a of the outer plate member 94 forms the noise suppression mechanism 88. The rear end face 94a of the outer plate member 94 is inclined at an angle of 30 degrees or more and 85 degrees or less with respect to the flow direction (i.e., at an angle of 5 degrees or more and 60 degrees or less with respect to the plane orthogonal to the flow direction). In the present embodiment, the rear end face 94a of the outer plate member 94 is inclined at an angle of 60 degrees with respect to the flow direction (i.e., at an angle of 30 degrees with respect to the plane orthogonal to the flow direction). Further, preferably, the rear end face 94a of the outer plate member 94 is inclined at an angle of 40 degrees or more and 80 degrees or less with respect to the flow direction (i.e., at an angle of 10 degrees or more and 50 degrees or less with respect to the plane orthogonal to the flow direction). In the present embodiment, the inclination angle of the rear end face 94a of the outer plate member 94 is the same as the inclination angle of the rear end face 92a of the central plate member 92. Further, in a modified example, the inclination angle of the rear end face 94a of the outer plate member 94 may be different from the inclination angle of the rear end face 92a of the central plate member 92.

[0062] A plurality of notches 98 are formed at the front end portions of the central plate member 92 and the outer plate member 94. The notches 98 are recessed rearward from the front end portions of the central plate member 92 and the outer plate member 94. The notches 98 form the noise suppression mechanism 88.

[0063] The surface roughness Ra of each of the rear end surfaces 92a of the central plate member 92 and the rear end surfaces 94a of the outer plate member 94 is 0.1 or more. In the present embodiment, the surface roughness Ra of each of the rear end surfaces 92a of the central plate member 92 and the rear end surfaces 94a of the outer plate member 94 is 0.1. The surface roughness Ra represents the arithmetic mean roughness. Further, in a modified example, the surface roughness Ra of each of the rear end surfaces 92a of the central plate member 92 and the rear end surfaces 94a of the outer plate member 94 may also be 0.2 or more and 8 or less. In the present embodiment, the approach prevention member 84 having the central plate member 92 and the outer plate member 94 is formed by die forming, and a texture is formed on the inner surface of the forming die, thereby adjusting the surface roughness Ra of each of the rear end surfaces 92a of the central plate member 92 and the rear end surfaces 94a of the outer plate member 94. Further, in a modified example, for example, the rear end surfaces 92a of the central plate member 92 and the rear end surfaces 94a of the outer plate member 94 may be subjected to sandblasting, and the rear end surfaces 92a of the central plate member 92 and the rear end surfaces 94a of the outer plate member 94 may be processed using a file, thereby adjusting the surface roughness Ra of each of the rear end surfaces 92a of the central plate member 92 and the rear end surfaces 94a of the outer plate member 94. In the present embodiment, the portions where the surface roughness Ra of each of the central plate member 92 and the outer plate member 94 is 0.1 form the noise suppression mechanism 88. Further, in a modified example, the noise suppression mechanism 88 may include portions where the surface roughness Ra of each of the central plate member 92 and the outer plate member 94 is 0.1 or more, or may include portions where the surface roughness Ra is 0.2 or more and 8 or less.

[0064] Next, the air supply operation of the blower 2 will be described. As Figure 2 shown, the handle 14 is held by the operator. When the operator presses the trigger 24 to rotate the motor 70, the fan 74 rotates about the axis 70a. Thereby, air flows from the suction port 62 into the fan housing chamber 40. The air flowing into the fan housing chamber 40 is sent by the fan 74 to the outside in the radial direction of the central axis AX and passes through the air flow path 42. As Figure 3 shown, the air flowing through the air flow path 42 flows toward the discharge port 64 and then flows into the nozzle tube 82. As Figure 4As shown, the air flowing into the nozzle tube 82 flows around the approach prevention member 84. The rear end surfaces 92a of the central plate member 92 and 94a of the outer plate member 94 are located on the upstream side in the flow direction as they go toward the inner side in the radial direction of the nozzle tube 82. Therefore, the position and distribution where turbulence is generated in the flow direction change in the radial direction of the nozzle tube 82. In addition, the air flows along the notches 98 formed at the front end portions of the central plate member 92 and the outer plate member 94, thereby generating turbulence. As a result, within the set flow rate of the blower 2, even when air flows in the nozzle tube 82, the generation of noise can be suppressed. The air flowing around the approach prevention member 84 is discharged from the front end opening of the nozzle tube 82.

[0065] (Effect)

[0066] In the present embodiment, the blower 2 includes: a fan 74; a housing 4 that has a discharge port 64 and houses the fan 74; and a nozzle 80 that can be attached to the discharge port 64. As Figure 4 shown, the nozzle 80 includes: a nozzle tube 82 through which air flows inside; and plate members 92, 94 that are disposed inside the nozzle tube 82. The rear end surfaces 92a, 94a of the plate members 92, 94 are inclined with respect to the flow direction of the air flowing inside the nozzle tube 82.

[0067] The air flowing into the nozzle tube 82 flows around the plate members 92, 94. Thereby, turbulence is generated. When the rear end surfaces of the plate members are not inclined with respect to the plane orthogonal to the flow direction, since turbulence is generated, noise may be generated within a relatively narrow specific frequency range. In the above structure, since the rear end surfaces 92a, 94a of the plate members 92, 94 are inclined with respect to the flow direction, the position and distribution where turbulence is generated in the flow direction can be changed. Thereby, the generation of noise can be suppressed.

[0068] In addition, the rear end surfaces 92a, 94a of the plate members 92, 94 are located at positions on the upstream side in the flow direction as they go toward the inner side in the radial direction of the nozzle tube 82.

[0069] In the above structure, when the rear end surfaces 92a, 94a of the plate members 92, 94 are located more on the upstream side in the flow direction as they are closer to the inner side in the radial direction of the nozzle tube 82, the position and distribution where turbulence is generated in the flow direction can be changed in the radial direction of the nozzle tube 82. Thereby, the generation of noise can be further suppressed.

[0070] In addition, the rear end surfaces 92a, 94a of the plate members 92, 94 are inclined with respect to the flow direction at an angle of 30 degrees or more and 85 degrees or less.

[0071] When the rear end faces 92a, 94a of the plate members 92, 94 are inclined at an angle less than 30 degrees with respect to the flow direction, the strength of the plate members 92, 94 is insufficient. In addition, when the rear end faces 92a, 94a of the plate members 92, 94 are inclined at an angle greater than 85 degrees, it is impossible to sufficiently suppress the generation of noise. In the above structure, it is possible to ensure the strength of the proximity prevention member 84 and suppress the generation of noise.

[0072] In addition, the plate members 92, 94 have notches 98.

[0073] In the above structure, by the simple structure of providing the notches 98 in the plate members 92, 94, the position and distribution of the generation of turbulent flow change, and the generation of noise can be suppressed.

[0074] In addition, portions with a surface roughness of 0.1 or more are formed in the plate members 92, 94.

[0075] When portions with a surface roughness Ra of 0.1 or more are not formed in the plate members 92, 94, it is impossible to sufficiently suppress the generation of noise. In the above structure, by the change in the position and distribution of the generation of turbulent flow, the generation of noise can be suppressed.

[0076] In addition, the width W1 of the plate members 92, 94 in the flow direction is 10% or more of the inner diameter D1 of the nozzle tube 82.

[0077] When the width W1 of the plate members 92, 94 is less than 10% of the inner diameter D1 of the nozzle tube 82, the strength of the plate members 92, 94 is insufficient. In the above structure, the strength of the plate members 92, 94 can be ensured.

[0078] In addition, when observing the nozzle 80 in the flow direction, the thickness T1 of the plate members 92, 94 is 1% or more and 8% or less of the inner diameter D1 of the nozzle tube 82.

[0079] When the thickness T1 of the plate members 92, 94 is less than 1% of the inner diameter D1 of the nozzle tube 82, the strength of the plate members 92, 94 is insufficient. In addition, when the thickness T1 of the plate members 92, 94 is greater than 8% of the inner diameter D1 of the nozzle tube 82, the flow path resistance in the nozzle tube 82 becomes large. In the above structure, the strength of the plate members 92, 94 can be ensured, and the excessive flow path resistance of the nozzle tube 82 can be suppressed.

[0080] (Corresponding relationship)

[0081] The central plate member 92 and the outer plate member 94 are an example of the "plate member".

[0082] (Second Embodiment)

[0083] Refer to Figure 7And Figure 8 Describe the second embodiment. In the second embodiment, the points different from the first embodiment are described, and for the points the same as those in the first embodiment, the same reference numerals are assigned and the description is omitted. The nozzle 80 described in the first embodiment can be applied to the blower 102 of this embodiment. The structure of the blower 102 other than the nozzle 80 is described below. As Figure 7 shown, the blower 102 has a housing 104 and a trigger 124. The housing 104 has a main housing 106, a front connection portion 110, a rear connection portion 112, and a handle 114. The rear end opening of the main housing 106 is covered by a cover member 128. The cover member 128 has a plurality of suction ports 128a. The plurality of suction ports 128a penetrate the cover member 128 in the thickness direction. A discharge port 164 is formed at the front end portion of the main housing 106. The nozzle 80 is installed at the discharge port 164. The front connection portion 110 extends upward from the upper front side of the main housing 106. The rear connection portion 112 extends upward from the upper rear side of the main housing 106. A battery pack B is detachably installed at the rear connection portion 112. The handle 114 extends from the upper rear side of the front connection portion 110 to the upper front side of the rear connection portion 112. The trigger 124 is installed on the handle 114.

[0084] As Figure 8 shown, the blower 102 has a motor housing 168, a motor 170, a fan 174, and a stator vane 176. The motor housing 168, the motor 170, the fan 174, and the stator vane 176 are arranged inside the main housing 106. The motor housing 168 is fixed relative to the main housing 106. The motor 170 is arranged inside the motor housing 168. The motor 170 has the same structure as the motor 70 in the first embodiment. The rear end portion of the shaft 170a of the motor 170 projects rearward from the rear end portion of the motor housing 168. The fan 174 is fitted to the rear end portion of the shaft 170a. The fan 174 is an axial flow fan. When the shaft 170a rotates, the fan 174 rotates. The air is pressed from the rear side to the front side by the fan 174, and the air flows from the rear end opening to the discharge port 164 in the air flow path 142 formed inside the main housing 106.

[0085] The stator vane 176 is arranged at a position downstream of the fan 174 in the air flow direction and upstream of the approach prevention member 84 in the air flow direction. The stator vane 176 is formed independently of the approach prevention member 84. The stator vane 176 is arranged on the fan 174 side of the approach prevention member 84 in the flow direction. The stator vane 176 has a plurality of fins, and the plurality of fins are arranged at equal intervals in the circumferential direction along the outer peripheral surface of the motor housing 168, and the illustration thereof is omitted. The stator vane 176 adjusts the flow of the air pressed by the fan 174. Thus, the air whose flow has been adjusted by the stator vane 176 flows inside the nozzle tube 82 of the nozzle 80.

[0086] (Third Embodiment)

[0087] Refer to Figure 9 , and the third embodiment will be described. In the third embodiment, the points different from those in the first embodiment will be described, and for the points the same as those in the first embodiment, the same reference numerals will be given and the description will be omitted. In the third embodiment, the inclination direction of the rear end face 92a of the central plate member 92 is different from that of the rear end face 92a of the central plate member 92 in the first embodiment, and the inclination direction of the rear end face 94a of the outer plate member 94 is different from that of the rear end face 94a of the outer plate member 94 in the first embodiment. The central portion of the rear end face 92a of the central plate member 92 is located at the most downstream position, and both end portions of the rear end face 92a of the central plate member 92 are located at the most upstream position. The rear end face 92a of the central plate member 92 is located on the downstream side in the flow direction as it goes toward the inner side in the radial direction of the nozzle tube 82. The rear end face 92a of the central plate member 92 is inclined at an angle of 30 degrees or more and 85 degrees or less with respect to the flow direction (that is, an angle of 5 degrees or more and 60 degrees or less with respect to a plane orthogonal to the flow direction). In the present embodiment, the rear end face 92a of the central plate member 92 is inclined at an angle of 60 degrees with respect to the flow direction (that is, an angle of 30 degrees with respect to a plane orthogonal to the flow direction). In addition, preferably, the rear end face 92a of the central plate member 92 is inclined at an angle of 40 degrees or more and 80 degrees or less with respect to the flow direction (that is, an angle of 10 degrees or more and 50 degrees or less with respect to a plane orthogonal to the flow direction).

[0088] The rear end face 94a of the outer plate member 94 is located on the downstream side in the flow direction as it goes toward the inner side in the radial direction of the nozzle tube 82. The rear end face 94a of the outer plate member 94 is inclined at an angle of 30 degrees or more and 85 degrees or less with respect to the flow direction (that is, an angle of 5 degrees or more and 60 degrees or less with respect to a plane orthogonal to the flow direction). In the present embodiment, the rear end face 94a of the outer plate member 94 is inclined at an angle of 60 degrees with respect to the flow direction (that is, an angle of 30 degrees with respect to a plane orthogonal to the flow direction). In addition, preferably, the rear end face 94a of the outer plate member 94 is inclined at an angle of 40 degrees or more and 80 degrees or less with respect to the flow direction (that is, an angle of 10 degrees or more and 50 degrees or less with respect to a plane orthogonal to the flow direction). A notch 98 is formed in the rear end face 92a of the central plate member 92 and the rear end face 94a of the outer plate member 94.

[0089] In the present embodiment, the rear end faces 92a and 94a of the plate members 92 and 94 are located on the downstream side in the flow direction as they go toward the inner side in the radial direction of the nozzle tube 82.

[0090] In the above-described structure, when the rear end faces 92a and 94a of the plate members 92 and 94 are located more downstream in the flow direction as they are closer to the inner side in the radial direction of the nozzle tube 82, it is possible to change the position and distribution where turbulent flow is generated in the flow direction in the radial direction of the nozzle tube 82. Thereby, generation of noise can be further suppressed.

[0091] (Fourth Embodiment)

[0092] Refer to Figure 10 , and the fourth embodiment will be described. In the fourth embodiment, the points different from the first embodiment will be described, and for the points the same as those in the first embodiment, the same reference numerals will be given and the description will be omitted. In the fourth embodiment, the proximity prevention member 84 also has a plurality of slits 286. The slits 286 are formed in both the central plate member 92 and the outer plate member 94. The slits 286 penetrate the central plate member 92 from the rear end face 92a of the central plate member 92 toward the front end portion (i.e., in the flow direction). Further, the slits 286 penetrate the outer plate member 94 from the rear end face 94a of the outer plate member 94 toward the front end portion (i.e., in the flow direction). The slits 286 extend parallel to the flow direction. In addition, in a modified example, the slits 286 may also extend obliquely with respect to the flow direction. When air flows inside the nozzle tube 82, the air can flow in the slits 286.

[0093] In the present embodiment, the blower 2 has: a fan 74; a housing 4 that has an air outlet 64 and houses the fan 74; and a nozzle 80 that can be attached to the air outlet 64. The nozzle 80 has: a nozzle tube 82 through which air flows inside; and plate members 92 and 94 that are disposed inside the nozzle tube 82. The plate members 92 and 94 have slits 286 that penetrate the plate members 92 and 94 in the flow direction in which air flows inside the nozzle tube 82.

[0094] When the plate members 92 and 94 do not have the slits 286, turbulent flow is generated, and thus noise may be generated in a relatively narrow specific frequency range. In the above-described structure, since the plate members 92 and 94 have the slits 286, air flows not only around the plate members 92 and 94 but also in the slits 286. Compared with the case where the plate members 92 and 94 do not have the slits 286, it is possible to change the position and distribution where turbulent flow is generated. Thereby, generation of noise can be suppressed.

[0095] (Modified Example of the Fourth Embodiment)

[0096] In a modification of the fourth embodiment, the rear end surface 92a of the central plate member 92 and the rear end surface 94a of the outer plate member 94 are not inclined. That is, the rear end surface 92a of the central plate member 92 and the rear end surface 94a of the outer plate member 94 are arranged parallel to a plane orthogonal to the flow direction.

[0097] (Fifth Embodiment)

[0098] The fifth embodiment will be described. In the fifth embodiment, the points different from the first embodiment will be described, and for the points the same as those in the first embodiment, the same reference numerals will be given and the description will be omitted. In the fifth embodiment, the approach prevention member 84 has recesses instead of the notches 98. The recesses are formed in both the central plate member 92 and the outer plate member 94. The recesses are arranged near the front end portions of the central plate member 92 and the outer plate member 94. The recesses are recessed from the side surfaces of the central plate member 92 and the outer plate member 94.

[0099] In the present embodiment, the plate members 92, 94 have recesses.

[0100] In the above structure, by the simple structure of providing recesses in the plate members 92, 94, the position and distribution of the generation of turbulent flow are changed, and the generation of noise can be suppressed.

[0101] It may also be that the approach prevention member 84 in one embodiment does not form the notch 98. Additionally, it may also be that the approach prevention member 84 does not form recesses.

[0102] It may also be that the approach prevention member 84 in one embodiment does not include a portion with a surface roughness Ra of 0.1 or more. Additionally, it may also be that the overall surface roughness Ra of the approach prevention member 84 is 0.1 or more.

[0103] The number of the central plate members 92 in one embodiment is not limited to four, and may be three or less, or may be five or more. Additionally, the number of the outer plate members 94 in one embodiment is not limited to four, and may be three or less, or may be five or more.

[0104] It may be that the approach prevention member 84 of one embodiment only has an outer plate member 94. In this case, it may also be that when observing the outer plate member 94 in the flow direction, the outer plate member 94 extends from the first position on the inner surface of the nozzle tube 82 to the second position on the inner surface of the nozzle tube 82. The first position has a 180-degree interval from the second position in the circumferential direction of the inner surface of the nozzle tube 82. It may also be that the rear end surface 94a of the outer plate member 94 is inclined at a certain angle with respect to the flow direction. Additionally, it may be that the rear end surface 94a of the outer plate member 94 is located on the upstream side of the flow direction as it goes from the first position toward the second position. Additionally, it may be that the rear end surface 94a of the outer plate member 94 is located on the downstream side of the flow direction as it goes from the first position toward the second position.

Claims

1. A blower, wherein, the blower has: a fan; a housing having an outlet and housing the fan; and a nozzle that can be attached to the outlet, the nozzle having: a nozzle tube through which air flows inside; and a plate member disposed inside the nozzle tube, the plate member having: two side surfaces disposed along the flow direction of air flowing inside the nozzle tube; and a rear end surface that connects the rear ends of the two side surfaces, and the rear end surface of the plate member is inclined with respect to the flow direction.

2. The blower according to claim 1, wherein, the rear end surface of the plate member is located on the upstream side of the flow direction as it goes toward the inner side in the radial direction of the nozzle tube.

3. The blower according to claim 1, wherein, the rear end surface of the plate member is located on the downstream side of the flow direction as it goes toward the inner side in the radial direction of the nozzle tube.

4. The blower according to claim 1, wherein, the rear end surface of the plate member is inclined with respect to the flow direction at an angle of 30 degrees or more and 85 degrees or less.

5. The blower according to claim 1, wherein, the plate member has a slit that penetrates the plate member in the flow direction.

6. A blower, wherein, the blower has: a fan; a housing having an outlet and housing the fan; and a nozzle that can be attached to the outlet, the nozzle having: a nozzle tube through which air flows inside; and a plate member disposed inside the nozzle tube, the plate member having: two side surfaces disposed along the flow direction of air flowing inside the nozzle tube; a rear end surface that connects the rear ends of the two side surfaces; and a front end portion that connects the front ends of the two side surfaces, the plate member having a slit that penetrates the plate member from the rear end surface to the front end portion in the flow direction.

7. The blower according to any one of claims 1 to 6, wherein, the plate member has a notch.

8. The blower according to any one of claims 1 to 6, wherein, the plate member has a recess.

9. The blower according to any one of claims 1 to 6, wherein, a portion having a surface roughness of 0.1 or more is formed on the plate member.

10. The blower according to any one of claims 1 to 6, wherein, the width of the plate member in the flow direction is 10% or more of the inner diameter of the nozzle tube.

11. The blower according to any one of claims 1 to 6, wherein, when observing the nozzle in the flow direction, the thickness of the plate member is 1% or more and 8% or less of the inner diameter of the nozzle tube.

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