Blower

Abstract

The present invention provides an air blower that adjusts the flow of air flowing inside a casing to improve the cooling performance of a motor. The air blower includes: a fan (16) that generates an air flow in the axial direction of a rotating shaft; a cylindrical motor bracket (30) that is formed in a cylindrical shape and holds the motor radially inward; and a fan casing (3) that accommodates the motor, the motor bracket (30) and the fan (16) and forms an air flow path, and an integrally formed first rectifying portion (21 to 24) is provided on the inner side of the fan casing (3). The first rectifying portion is formed by rib-shaped leaves from the first leaf (21) to the fourth leaf (24) to weaken the swirling component of the air flow (F1, F2) discharged from the fan (16) and guide it in a manner that it flows smoothly in the axial direction as shown by the arrow (F3) in the attached figure. The motor bracket (30) is configured to have an axial length that is shorter than that of the motor.

Description

Technical Field

[0001] The present invention relates to a portable blower, which sucks air from an air inlet into a housing through the rotation of a fan housed in a housing, and discharges air from an air outlet to the outside of the housing. Background Art

[0002] As a conventional portable air blower, a blower described in Patent Document 1 is known. The air blower has the following structure, that is, a fan driven by a motor is used to introduce external air from an inlet formed in a housing, and the sucked air is blown out to any area through a nozzle installed in a blow-out port. The operator holds the handle of the air blower and performs the operation while pointing the tip of the nozzle toward the area to be blown out. Among the operations performed using the air blower, for example, there is an operation of blowing away garbage on the ground, and the handle is held in a manner that the nozzle is directed forward and obliquely downward, and the housing of the main body is swung left and right, thereby blowing away garbage on the ground while swinging the tip of the nozzle left and right. In the air blower, a centrifugal fan or an axial flow fan can be used, and the air inlet (opening) of the housing for introducing the wind passing through the fan is arranged near the motor. Moreover, in the air blower of Patent Document 1, the entire motor is accommodated inside the roughly cylindrical main body housing through the motor housing, and the motor is arranged near the axis of the main body housing. The motor housing has an inner cylinder portion that accommodates the motor and an outer cylinder portion that contacts the inner surface of the housing. By forming a radially extending stator blade portion between the inner cylinder and the outer cylinder, a rectifying effect of the air flowing in the housing is generated, thereby improving the air supply performance and reducing noise, etc. Furthermore, a discrete rectifying cone is installed at the downstream opening portion of the inner cylinder portion that holds the motor, and a plurality of auxiliary stator blades extending outward are formed on the outer surface of the rectifying cone.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2014-137030 Summary of the invention

[0006] In a portable blower, in order to improve the rectifying effect of the stator blades, it is ideal to extend the axial length of the stator blades. However, in a blower with a structure in which stator blades are provided on a motor housing, the enlargement of the stator blades will lead to the enlargement of the motor housing, resulting in an increase in the weight of the cover due to the enlargement, which impairs the portability of the blower. In addition, since the inner cylinder portion of the motor housing is used to accommodate the entire motor, the cooling performance of the motor is impaired, so it is necessary to fully consider the cooling measures of the motor for design. Furthermore, it is not good to provide a plurality of stator blades on the outer peripheral surface of the motor housing side such as the rectifying cone, which is not well formed. Depending on the structure of the stator blades, it sometimes leads to an increase in the number of parts, resulting in an increase in the manufacturing cost of the product.

[0007] Problems to be solved by the invention

[0008] The present invention is made in view of the above background, and its object is to provide the following blower, that is, avoiding the enlargement of the cover and achieving the improvement of the air supply performance or the reduction of the noise. Another object of the present invention is to provide the following blower, that is, improving the cooling performance of the motor. Still another object of the present invention is to provide the following blower, that is, by designing the shape of the stationary blades formed on the inner wall of the cover, the stationary blades can be molded by the same injection molding as before, thereby suppressing the increase in manufacturing costs.

[0009] Technical means of solving problems

[0010] If the representative features of the invention disclosed in this case are described, they are as follows. According to one feature of the present invention, the blower includes: a motor having a rotating shaft; a fan that rotates by the driving force of the motor and generates an air flow in the axial direction of the rotating shaft; a cylindrical motor bracket that is formed into a cylindrical shape extending in the axial direction and holds the motor on the radial inner side; a fan case that is formed into a cylindrical shape extending in the axial direction and accommodates the motor, the motor bracket and the fan and forms a flow path for the air flow; and a cover case that includes a fan case and a handle held by an operator, and a first rectifying portion is formed on the radial inner side of the fan case. The first rectifying portion can be a plurality of ribs protruding inward from the inner circumference of the fan case and formed integrally with the cover case. Here, the motor bracket is configured to have an axial length that is shorter than the motor.

[0011] According to another feature of the present invention, the fan case is formed by two components divided in the left-right direction perpendicular to the axial direction, and a plurality of ribs are configured to extend in the left-right direction. With the structure described above, the present invention can be easily implemented by simply changing the shape of the mold during injection molding of the cover. Furthermore, a plurality of ribs extend from the inner circumferential surface in a direction orthogonal to the dividing surface of the two components. Moreover, when viewed in the left-right direction, the shape of the rib on the side axially away from the fan is formed in a manner close to the rotation axis, and the side of the rib close to the fan is configured to include a portion extending obliquely relative to the rotation axis.

[0012] According to another feature of the present invention, the motor has: a covered portion, the radial outer side of which is covered by the motor bracket; and an exposed portion, the radial outer side of which is not covered by the motor bracket. The fan case portion of the housing has a conical portion that contracts in a manner that the diameter decreases as the motor moves away from the motor in the axial direction in the flow path direction of the air flow, and most or all of the first rectification portion is arranged in the conical portion. In addition, the first rectification portion can be configured to include a first support portion, which is supported by abutting against the outer peripheral surface of the bearing bracket of the motor.

[0013] According to another feature of the present invention, the motor bracket has an integrally formed second rectifying portion on the radially outer side. The second rectifying portion is formed on a second supporting portion that abuts against the motor and the fan housing and supports the motor. Moreover, the second rectifying portion abuts against the fan housing via an elastic body. Furthermore, the second rectifying portion includes a first rib extending in the radial direction and a second rib extending obliquely in the axial direction.

[0014] Effects of the Invention

[0015] According to the present invention, a first rectifying portion is formed on the inner circumference of the fan case, so that the swirling flow of the air discharged from the fan can be attenuated, and the air supply performance can be improved and the noise can be reduced. In addition, a second rectifying portion is formed on the motor bracket, so that in addition to rectifying the air sent from the fan, the motor can also be supported. Furthermore, the motor bracket does not cover the entire motor but supports a part, so the outer surface of the motor is exposed to the air flow, and the cooling performance of the motor is improved. Furthermore, the entire outer side of the motor is not covered, so the motor bracket can be made small and lightweight, and the entire blower can be made lightweight. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional diagram of the overall structure of the air blower 1 according to an embodiment of the present invention.

[0017] Figure 2 for Figure 1 A perspective view of the blower 1 with the left cover 2 and the nozzle 50 removed.

[0018] Figure 3 for Figure 1 A vertical cross-sectional view of the blower 1 with the left cover 2 removed.

[0019] Figure 4 for Figure 1 A horizontal cross-section of the blower 1 through the rotation axis A1.

[0020] Figure 5 To express Figure 1 1 is a perspective view of the installation state of the cover 2 and the motor bracket on the right side of the blower 1, and is a view showing the direction of wind flowing in the cover 2.

[0021] Figure 6 for Figure 5 , and is a diagram showing the flow of wind.

[0022] Figure 7 For Figure 1 1 is a perspective view of the fan assembly 10 in which the motor 11 and the fan 16 are mounted on the motor bracket 30 .

[0023] Figure 8 for Figure 71 is a side view of the fan assembly 10.

[0024] Fig. 9 for Figure 8 A three-dimensional view of a motor bracket 30 monomer.

[0025] Fig.10 for Figure 4 Cross-sectional view of section AA.

[0026] Explanation of symbols

[0027] 1: Blower

[0028] 2: Cover

[0029] 3: Fan housing

[0030] 3a, 3c: Conical part

[0031] 3b: Cylinder

[0032] 3d: concavity

[0033] 3e: convex part

[0034] 4: Battery installation

[0035] 5: Handle

[0036] 5a: Grip

[0037] 5b: Front connection

[0038] 5c: Rear connection

[0039] 6: Top

[0040] 6a: Opening

[0041] 6b: Ring groove

[0042] 7a: First air intake

[0043] 7b: Second air intake

[0044] 8: Feet

[0045] 9: Installation groove

[0046] 9a: Axial groove

[0047] 9b: Circumferential groove

[0048] 10: Fan assembly

[0049] 11: Motor

[0050] 11a: Rotation axis

[0051] 12a, 12b: Electrodes

[0052] 13: Opening

[0053] 14: Cooling fan

[0054] 15a, 15b: Bearing bracket

[0055] 15c: Suction hole

[0056] 16: Fan

[0057] 16a: Rotating shaft

[0058] 16b: Blade

[0059] 16c: Mask

[0060] 16d: Opening

[0061] 17a~17m:Threaded hole

[0062] 18a~18m: Threaded column

[0063] 19: Install components

[0064] 20: First stationary blade section (first rectifying section)

[0065] 21: First Leaf

[0066] 21a: Front end (of the first leaf)

[0067] 21b: Backend part

[0068] 22: Second Leaf

[0069] 22a: A portion (on the tip side of the second leaf)

[0070] 23: The Third Leaf

[0071] 23a: apex (of the third leaf)

[0072] 23b: Inner peripheral side edge

[0073] 24: The Fourth Leaf

[0074] 25: Motor support rib

[0075] 26: First guide

[0076] 27: Second guide part

[0077] 28: Shock absorber

[0078] 30: Motor bracket

[0079] 31: Rear wall

[0080] 31a: Opening

[0081] 31b: threaded hole

[0082] 32: Inner cylinder (motor housing)

[0083] 33: Radial rib (first rib)

[0084] 34: Middle tube

[0085] 35: Second stationary blade (second rib)

[0086] 35a: Flat surface

[0087] 35b: Bend

[0088] 36: Outer cylinder part

[0089] 36a: convex part

[0090] 36b: concave part

[0091] 37: Motor coating

[0092] 38: Motor exposed part

[0093] 39a, 39b: Opening

[0094] 40: Switch panel

[0095] 41: Switch unit

[0096] 42: Circuit board

[0097] 44: Screw

[0098] 45: Rotation direction of fan 16

[0099] 48: Elastomer

[0100] 48a: concave part

[0101] 48b: Hollow part

[0102] 50: Nozzle

[0103] 51: Spout

[0104] 52: convex part

[0105] 80: Battery pack

[0106] 81: Lock button

[0107] A1: The axis of rotation of the motor

[0108] F1: Air flow through the fan

[0109] F2: Air flow through the second stator blade

[0110] F3: Air flow through the first stator blade

[0111] F4: Flow in which the air rectified by the first stator blade is guided to the exhaust side by the second guide portion

[0112] F5: Flow in which the air rectified by the first stator blade is guided into the motor 11 by the first guide portion

[0113] L: Motor axial length

[0114] L 1 :Axial length of motor housing

[0115] L 2 : Axial length of the outer cylinder

[0116] D 1 : Diameter of motor bracket

[0117] D 2 : Diameter of the motor housing

[0118] D m : Diameter of the motor DETAILED DESCRIPTION

[0119] Example 1

[0120] Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. In addition, in the following drawings, the same reference numerals are used for the same parts, and repeated descriptions are omitted. Moreover, in this specification, the front-back and the top-bottom directions are described as the directions shown in the drawings.

[0121] Figure 1 In the embodiment, a cordless portable blower 1 includes a motor 11 (described below) inside a resin housing 2, for example. Figure 2 ) and fan 16 (described below Figure 2 ), the motor 11 (not shown) is driven by the power of the battery pack 80. The air flow generated by the rotation of the fan 16 (not shown) is ejected to the front side through the nozzle 50. The operator holds the handle 5 of the blower 1 to perform the operation. The blower 1 is usually held with the nozzle 50 tilted downward toward the front, and the handle 5 is swung back and forth and left and right, thereby swinging the top of the nozzle 50 back and forth and left and right, and the garbage in the cleaning target area such as the table or the floor is blown away.

[0122] The cover 2 includes: a fan casing 3 having a bulging diameter near the center in the front-to-back direction; a battery mounting portion 4 formed in a thin cylindrical shape on the rear side of the fan casing 3; a handle portion 5 connecting the central portion of the fan casing 3 and the rear side of the battery mounting portion 4; and a cylindrical top end portion 6 formed on the front side of the fan casing 3, and these portions are integrally manufactured by molding synthetic resin. The cover 2 is formed in a state of being divided into two by a dividing surface in the center of the left and right sides, and is fixed by a plurality of screws described later. The left side portion of the cover 2 is formed with a plurality of threaded columns 18a to 18m ( Figure 1 18c, 18i~18m are not shown, and threaded columns with threaded holes are formed at positions corresponding to these threaded columns on the right side of the cover 2.

[0123] The handle 5 is a part that the operator holds with one hand, and the front side portion of the handle 5 is formed with a front side connection portion 5b extending substantially in the vertical direction and connected to the upper surface of the fan housing 3, and the rear side connection portion 5c of the rear side portion is connected to the rear end portion of the battery mounting portion 4. A switch panel 40 is provided on the upper side of the grip portion 5a of the handle 5, and the switch panel 40 is used to operate the motor 11 (described below). Figure 2 The first air inlet 7a is formed on the left and right sides of the front connecting portion 5b of the handle portion 5. Here, the first air inlet 7a is an opening for sucking in external air, and a plurality of slender slits are formed in the horizontal direction. The second air inlet 7b is provided on the left and right sides of the rear side of the battery mounting portion 4. The first air inlet 7a and the second air inlet 7b become the air inlets of the blower 1.

[0124] A battery pack 80 is installed on the lower side of the battery mounting portion 4 of the cover 2. In order to install the battery pack 80, two rail portions (not shown in the figure) extending horizontally in the front-to-back direction are formed at a predetermined distance in the left-right direction on the battery mounting portion 4, and the battery pack 80 is installed by horizontally moving along the rail portions from the rear side to the front side of the cover 2. When the battery pack 80 is removed from the cover 2, the battery pack 80 is horizontally moved toward the rear side of the cover 2 while pressing the lock buttons 81 provided on the left and right sides. The battery pack 80 is widely used in electric tools, and is formed by accommodating a plurality of battery cells (not shown) inside a synthetic resin box. The battery cell is a secondary battery that can be repeatedly charged and discharged, and well-known battery cells such as lithium-ion battery cells can be used. The output of the battery pack 80 is, for example, DC 18V or 36V, and the voltage is arbitrary.

[0125] If the battery pack 80 is installed on the cover 2, the blower 1 can be stably placed on a table or the like through the bottom surface of the battery pack 80 and the foot 8 formed on the front side of the cover 2. The foot 8 is manufactured integrally with the fan casing 3 by molding of synthetic resin. The nozzle 50 is a discrete part connected to the opening 6a formed on the front side of the top end 6 of the cover 2, and is formed into a conical shape with a small diameter at the top and gradually becoming thicker as it moves backward from the nozzle 51 toward the axis A1 direction. The nozzle 50 has a predetermined axial length in order to increase the flow rate by narrowing the flow path of the air discharged from the top end 6, and in order to easily spray the air flow onto a specific object. The nozzle 50 is manufactured by integral molding of synthetic resin. In addition, the nozzle connected to the top end 6a is not limited to Figure 1 The nozzle 50 of the shape shown in the figure may be various nozzles or extension tubes such as a nozzle in which the tip of a cylindrical straight tube is bent flatly, a bent tube, etc.

[0126] Figure 2 It is an exploded stereoscopic view of the blower 1 of an embodiment of the present invention, and shows a state in which the nozzle 50 and the left side portion of the cover 2 are removed. The cover 2 includes a fan casing 3, a battery mounting portion 4, a handle portion 5 and a top portion 6, and is formed by dividing the left and right parts by a vertical plane passing through the rotation axis of the motor 11. On the right side of the cover 2, threaded columns 17a to 17m with threaded holes are formed, which are fixed to the left side portion of the cover 2 by a screw not shown. The fan casing 3 is a part of the cover 2, and is formed in a cylindrical shape in order to accommodate the motor 11 and the fan 16 on the inside. On the inner side of the fan casing 3, the motor 11 is held in a concentric position with the axis of the top portion 6 by a motor bracket 30.

[0127] The motor 11 is a brushed DC motor housed in a metal housing. A centrifugal cooling fan 14 is provided inside the motor 11. A rotating shaft 11a (reference symbol to be described below) protrudes to the rear of the motor 11. Figure 3 ), a fan 16 is provided. The fan 16 is manufactured by integral molding of synthetic resin, and is formed with a plurality of curved blades 16b extending obliquely toward the axial front side from a central rotating shaft portion 16a, and a conical shroud 16c is provided in a manner connecting the outer edges of the blades 16b.

[0128] The rotating shaft (not shown) of the motor 11 is arranged to be aligned with the axis A1 (see Figure 1 , Figure 3) is coaxial with the rotating shaft of the motor 11 to pivotally support the fan 16. The motor bracket 30 is formed by integral molding of synthetic resin, and has an outer cylinder portion 36 formed radially outwardly to abut against the inner wall surface of the housing 2, and an inner cylinder portion 32 formed near the axis A1 to abut against the outer peripheral surface of the housing of the motor 11. Ribs extending in the radial direction are formed between the inner cylinder portion 32 and the outer cylinder portion 36, and the outer cylinder portion 36 is fixed in a manner that is concentric with the inner cylinder portion 32. Regarding the shape of the motor bracket 30, it will be Figure 7 Described in detail in etc.

[0129] The handle 5 is formed by the following parts: a grip 5a, which is gripped by the operator; a front connection 5b, which connects the front end of the grip 5a to the fan casing 3; and a rear connection 5c, which connects the rear end of the grip 5a to the fan casing 3. Here, the connection part between the front connection 5b of the handle 5 and the front side of the fan casing 3 is divided in a manner that air cannot flow. On the other hand, the connection part between the handle 5 and the rear side of the fan casing 3 is constructed in a manner that the internal space is linked, and the air flows between the handle 5 and the fan casing 3.

[0130] The outside air introduced through the first air inlet 7a flows toward the rear side inside the handle portion 5, flows from the rear to the front side in the space inside the battery mounting portion 4, and merges with the air sucked from the second air inlet 7b to reach the fan 16. The air discharged from the fan 16 toward the front side passes through the inner side of the outer cylinder portion 36 of the motor bracket 30, reaches the space (inner space of the fan housing portion 3) housing the motor 11, and flows from the top portion 6 toward the nozzle 50 ( Figure 1 In the internal space of the fan casing 3, most of the air flows mainly along the outer peripheral part of the inner wall surface of the fan casing 3, and the flow of air near the inner peripheral side close to the outer peripheral surface of the motor 11 is reduced. Therefore, compared with the flow rate of the flowing air, it cannot be said that the cooling effect of the motor 11 is sufficiently high, but in this embodiment, a motor 11 is used that has an opening 13 on the outer peripheral surface and a cooling fan 14 on the inner side of the opening 13. The cooling fan 14 is turned on from the back side ( Figure 1 The opening (in the middle is the front surface side) draws in air and discharges the air radially outward.

[0131] The length of the inner cylinder 32 of the motor bracket 30 in the direction of the axis A1 is sufficiently shorter than the length of the motor 11 (here, the rotating shaft is not included in the length). As a result, more than half of the outer peripheral surface of the housing of the motor 11 is exposed in the air passage for the air supply. In this embodiment, the portion exposed in the air passage is defined as a motor exposed portion 38, and the portion covered by the motor bracket 30 is defined as a motor covered portion 37 (refer to the symbols to be described below). Figure 4). The cylindrical housing of the motor 11 is made of metal, so the cooling performance of the motor 11 can be improved by fully ensuring the motor exposure portion 38. Furthermore, by providing the motor exposure portion 38, the opening portion 13 can be exposed in the air passage in the fan housing portion 3, so that the cooling performance of the inside of the motor 11 can also be fully achieved.

[0132] At the front end of the motor 11, a convex bearing support 15b (hereinafter referred to as Figure 3 The motor support rib 25 is fixed to the motor support rib (first support portion) 25 (described in the figure). In order to absorb vibration during the fixing, a shock absorber 28 is installed between the motor support rib 25 and the bearing bracket 15b. The motor support rib 25 is formed in a manner extending from the inner wall portion of the fan housing 3 in the direction of the dividing surface, and is formed integrally with the cover housing 2. A curved second guide portion 27 is formed on the front side of the motor support rib 25. The second guide portion 27 forms a curved inclined surface that is continuous from the upper and lower surfaces of the motor support rib 25 to the front, connecting the top ends of the upper and lower inclined surfaces. A curved first guide portion 26 is formed on the front side of the motor support rib 25 to prevent turbulence of air on the rear surface side of the motor support rib 25. Most of the air flowing in the outer periphery of the motor 11 flows to the inside of the nozzle 50 connected to the top end portion 6, and a part of the air is sucked into the internal space of the motor 11 to the rear side through the suction hole 15c. The second guide portion 27 is a guide plate for rectifying the air flow on the downstream side of the motor support rib 25 , and suppresses turbulence of the air flow on the downstream side of the motor 11 .

[0133] On the inner peripheral surface of the fan housing 3 of the right housing 2, there are formed plate-like first blades 21 and second blades 22 extending from the inner wall to the left (see the following description). Figure 5 ), the third leaf 23 (refer to the following Figure 5 ) and the fourth blade 24. These four blades form the first stationary blade portion 20, and the first stationary blade portion 20 is formed to rectify the air flow inside the fan casing 3. In addition, Figure 2 In the figure, only a portion 22a and 23a of the front side of the second leaf 22 and the third leaf 23 are seen, and the shapes of the second leaf 22 and the third leaf 23 will be Figure 5 The first to fourth leaves 21 to 24 are examples of a first rectifying portion.

[0134] The switch panel 40 is arranged on the upper surface of the switch unit 41. The switch unit 41 is equipped with an on button for rotating the motor 11, an off button for stopping the rotation, and a battery warning light. A circuit board 42 is provided on the lower side of the switch unit 41. When the on button of the switch panel 40 is pressed, the motor 11 rotates, and thus the fan 16 rotates, sucking in outside air from the first air intake port 7a formed in the handle portion 5 and the second air intake port 7b formed on the side surface of the rear end of the battery mounting portion 4. The sucked air reaches the fan 16 from the internal space of the battery mounting portion 4, passes between the inner cylinder portion 32 and the outer cylinder portion 36 of the motor bracket 30, flows forward around the motor 11, and reaches the nozzle 50 from the top end portion 6 (refer to Figure 1 ).

[0135] Figure 3 for Figure 2 A vertical cross-sectional view of the blower 1 passing through the rotation axis A1. The fan casing 3 is shaped as follows: it has a conical portion 3a that expands conically from the cylindrical top end portion 6 side to the large diameter portion holding the motor bracket 30, and conically contracts from the rear side of the large diameter portion to the vicinity of the connection portion with the battery mounting portion 4. The motor 11 is mounted toward the rear from the motor bracket 30 to the front side. A metal mounting member 19 is provided at the rear end of the rotating shaft 11a of the motor 11, and a fan 16 for air supply is mounted on the mounting member 19. The motor 11 is arranged in a manner that the rotating shaft 11a and the axis A1 are concentric. The fan 16 is formed with a plurality of blades 16b that expand in an umbrella shape and extend from the outer peripheral side of the rotating shaft portion 16a to the rear in the direction of the axis A1. A conical hood 16c is connected to the rear edge of the blade 16b.

[0136] The motor bracket 30 is held by the outer peripheral portion of the outer cylinder 36 being clamped by the right and left portions of the housing 2. A convex portion 36a is formed on the upper side of the outer cylinder 36, and is held in the concave portion 3d of the housing 2 via an elastic body 48. The outer cylinder 36 is an example of a second support portion. The elastic body 48 is made of rubber and is a block having a space (concave portion) for accommodating the convex portion 36a. Similarly, a convex portion 36a is formed on the lower side of the motor bracket 30, and is held in the concave portion 3d of the housing 2 via an elastic body 48.

[0137] The motor 11 is a brushed direct current (DC) motor housed in a cylindrical metal housing, and the rear portion thereof is housed in the inner cylinder portion 32 of the motor bracket 30. That is, the inner cylinder portion 32 becomes the portion (motor housing portion) that houses the motor 11. Two threaded holes are formed in the rear wall portion 31 of the motor bracket 30, and the motor 11 is fixed by a screw 44 extending in a direction parallel to the axis A1. The rear side portion of the motor 11 is configured as a motor covering portion 37 whose outer peripheral surface is covered by the motor bracket 30. In this way, the motor 11 is held by using the motor bracket 30 covering the rear side and the motor support rib 25 at the front end, so that most of the outer peripheral surface of the outer casing of the motor 11 is exposed to the air path inside the fan casing 3. The air discharged from the fan 16 to the front side in the fan casing 3 flows from the top end portion 6 to the nozzle 50 side.

[0138] Figure 4 for Figure 1 A horizontal cross-sectional view of the blower 1 through the rotation axis A1. The motor 11 is arranged at the left and right center position in such a way that its rotation axis is consistent with the axis A1. Figure 1 ) and the motor 11 rotates, the fan 16 mounted on the rotating shaft (output shaft) 14 (not shown) of the motor 11 rotates, thereby generating air flows in the directions indicated by arrows F1 to F5.

[0139] Around the fan 16, the inner wall surface of the fan casing 3 that tapers conically from the front to the rear functions as a fan guide for guiding the air flowing into the fan 16 in a predetermined direction (forward). The shroud 16c of the fan 16 is arranged in a position close to the inner wall surface of the fan casing 3 in a manner that maintains a certain gap. A circular opening 16d is formed on the rear side near the axis A1 of the shroud 16c, and the air in the battery mounting portion 4 is sucked from the opening 16d by the rotation of the fan 16. The air flows radially outward along the umbrella-shaped rotating shaft portion 16a as indicated by the arrow F1 and is discharged to the front side. The air discharged from the fan 16 passes through the interior of the motor bracket 30 as indicated by the arrow F2. That is, the air flow passes through the middle cylinder portion 34 and the outer cylinder portion 36 (the symbols all refer to those described below). Figure 5 ) between the opening 39b (described below) Fig. 9), flows on the upper side of any blade (the third blade 23 in this example) of the first stationary blade portion 20 as indicated by arrow F3, flows on the upper left side of the motor support rib 25 and the upper part of the second guide portion 27 as indicated by arrow F4, and reaches the internal space of the top end portion 6, that is, the internal space of the nozzle 50. The third blade 23 is formed in a manner protruding from the inner wall surface of the fan casing 3 in the direction of the axis A1, but its inner peripheral side edge portion 23b is located at a position sufficiently away from the motor 11 and is not close to the outer peripheral surface of the motor 11. Therefore, a portion of the air flowing in the part closer to the inside than the third blade 23 abuts against the rear surface of the motor support rib 25, and the direction is bent toward the inside, flowing as indicated by arrow F5. Then, the air flowing as indicated by arrow F5 flows from the suction hole 15c to the internal space of the motor 11 due to the suction of the cooling fan 14.

[0140] Figure 4 The flow of arrows F1 to F4 indicates the air flow in the air exhausted from the fan 16 that flows from the rear to the front in the left space of the motor 11, but the air flow that flows from the rear to the front in the right space of the motor 11 also reaches the top end 6 in the same way. The inner wall surface of the front side of the fan housing 3 of the cover 2 is set to a shape that narrows at the front end toward the cylindrical top end 6, and the air flow F4 that flows forward along the outer peripheral surface of the motor 11 and the inner wall surface of the fan housing 3 toward the axis A1 is gathered and guided to the top end 6 formed into a cylindrical shape. Near the rear end of the cylindrical part of the top end 6, an annular groove 6b is formed for installing a mesh shield (not shown), and the mesh shield is used to prevent foreign matter from entering from the top end 6. Furthermore, the airflow flowing from the rear to the front in the space above and below the motor 11 also reaches the tip portion 6 in the same manner, but at this time, the first stationary blade portion for guidance is not formed in the upper and lower spaces corresponding to the arrow F3.

[0141] The fan housing 3 of the housing 2 has an outer diameter, and the horizontal and vertical cross sections are substantially the same shape, and the central diameter in the direction of the axis A1 is formed large, and the front and rear sides thereof are tapered. The motor 11 is composed of an outer cylinder 36 and an inner cylinder 32 (reference symbol). Figure 2 ) is positioned at the left-right center of the fan housing 3, and the axis A1 is arranged concentrically with the rotating shaft of the motor 11. The air passing through the top portion 6 reaches the internal space of the nozzle 50. Two convex portions 52 are formed on the outer peripheral surface near the rear end of the nozzle 50, which engage with the mounting groove portion 9 of the top portion 6.

[0142] Figure 5 To express Figure 1 1 is a perspective view of the installation state of the housing 2 and the motor bracket 30 on the right side of the blower 1, and is a view showing the direction of the wind flowing in the housing 2. The air flow indicated by arrows F1 to F5 corresponds to Figure 4 Here, the fan 16 rotates in the direction of the arrow 45, so the arrows F1 and F2 also flow axially backward while swirling in the same direction as the arrow 45. In contrast to the swirling, a second stator blade 35 (see the following description) is formed between the outer cylinder portion 36 and the middle cylinder portion 34 of the motor bracket 30. Fig. 9 ), the second stator blade 35 has an inclined surface whose position changes toward the front side as it rotates in the circumferential direction. The air flowing along the second stator blade 35 passes through the motor bracket 30 and flows toward the front side as indicated by the arrow F2. On the front side of the motor bracket 30, the air flow F3 flows while swirling on the outer peripheral surface due to the rotational force of the fan 16, but is guided here to the first stator blade portion 20 including the first blade 21, the second blade 22, the third blade 23, and the fourth blade 24. The swirling flow component in the air flow F3 is eliminated, and after being rectified into a flow close to an axial flow, it flows like the air flow F4. A portion of the air in the air flow F3 changes direction due to the motor support rib 25, as in the air flow F5, and is directed from the first guide portion 26 to the motor 11 (refer to Figure 4 )’s internal guidance.

[0143] The motor bracket 30 is clamped by the housing 2 via elastic bodies 48 at four locations on the outer circumference. On the inner circumferential surface of the housing 2, two recesses 3d and two protrusions 3e for accommodating the roughly quadrilateral elastic body 48 are alternately provided at intervals of 90 degrees in the circumferential direction. The elastic body 48 is a rubber molded product, and is formed with a recess 48a for engaging with the protrusions (36d, 3d) formed on the housing 2 or the motor bracket 30. The recess 48a has four hollow portions 48b for adjusting its cushioning characteristics. However, the shape of the elastic body 48 is arbitrary and is not limited to Figure 5 That shape.

[0144] Figure 6 for Figure 5 , and is Figure 5 The figure also shows the flow of wind. According to this figure, the side shape of the first stationary blade portion 20 formed on the inner side of the fan casing 3 of the housing 2 and including the first blade 21, the second blade 22, the third blade 23, and the fourth blade 24 is clear. The figure viewed from the side (viewed from the left) is orthogonal to the removal direction of the mold on the right side of the housing 2. It can be understood from the shapes of the first blade 21, the second blade 22, the third blade 23, and the fourth blade 24 that their plate-like extensions are consistent with the removal direction of the mold. On the other hand, Figure 6When viewed from the front-to-back direction, the shapes of the first blade 21, the second blade 22, the third blade 23, and the fourth blade 24 are not straight lines, but are slightly curved to suppress the swirling flow of the air flow F3. For example, with respect to the first blade 21, the rear end portion 21b is curved downward, and the vicinity of the front end 21a is basically formed into a horizontal plane. That is, when viewed from the left direction, the side (front side) of the first blade 21 away from the fan 16 in the direction of the axis A1 is close to the rotation axis A1, and is formed to extend obliquely from the rear side to the front side relative to the rotation axis A1. The second blade 22, the third blade 23, and the fourth blade 24 are also of the same shape.

[0145] The mounting groove 9 formed on the inner wall of the tip portion 6 is L-shaped in side view and includes an axial groove 9a extending parallel to the axis A1 and a circumferential groove 9b extending in the circumferential direction from the rear end of the axial groove. Figure 6 In the figure, only the mounting groove 9 formed in the right side portion of the housing 2 is shown, but a similar mounting groove 9 is also formed in the inner peripheral wall surface of the top end portion 6 in the left side portion of the housing 2.

[0146] Figure 7 For Figure 1 The fan assembly 10 is a three-dimensional view of a motor bracket 30 in which the motor 11 and the fan 16 are mounted. The fan assembly 10 is formed by inserting the motor 11 from the front side into the inner cylinder 32 of the motor bracket 30 and using the screw 44 (see Figure 3 ) is screwed, and the fan 16 is fixed to the rotating shaft 11a of the motor 11. Furthermore, convex parts or concave parts not shown in the figure are formed at four places on the outer peripheral surface of the outer cylinder part 36 of the motor bracket 30, and elastic bodies 48 are installed in each. Figure 3 ) A shock absorber 28 is installed. The shock absorber 28 is manufactured by integrally molding a synthetic resin or rubber, and is formed into a cup shape that covers the outer peripheral surface of the bearing bracket 15b. In addition, the shock absorber 28 has a plurality of hollow parts in order to suppress the radial vibration of the bearing bracket 15b, but the shock absorber 28 is set to any shape and has any vibration-damping characteristics.

[0147] The motor bracket 30 is formed by concentrically arranging three cylindrical parts, namely, an inner cylinder part 32, a middle cylinder part 34, and an outer cylinder part 36. The inner cylinder part 32 forms a motor housing part, and the inner peripheral surface of the inner cylinder part 32 abuts against the outer peripheral surface of the housing of the motor 11. The portion between the middle cylinder part 34 and the outer cylinder part 36 is a portion that becomes the main passage of the air discharged from the fan 16, and a second stator blade 35 extending obliquely in the circumferential direction is formed here. Seven second stator blades 35 are formed at equal intervals in the circumferential direction, and the space between them becomes an opening 39b. Between the inner cylinder part 32 and the middle cylinder part 34, eight radial ribs 33 extending in the radial direction and the axial direction are formed. The space between the eight radial ribs 33 becomes an opening 39a that is a space from the fan 16 side toward the rear side of the motor 11, but a part of the air flow ejected from the fan 16 flows from the rear to the front side of the motor bracket 30 through the opening 39b.

[0148] Figure 8 for Figure 7 The side view of the assembly (fan assembly 10) is shown. This state shows that the elastic body 48 is not installed. The inner cylinder portion 32 is the main part of the motor housing portion, and the rear side of the inner cylinder portion 32 is the rear wall portion 31. The rear wall portion 31 is formed with an opening 31a (described below). Fig. 9 ), the bearing support 15a of the motor 11 protrudes backward from the opening 31a on the rear side. Electrodes 12a and 12b for supplying power to the motor 11 are formed at two locations on the rear side of the motor 11. Lead wires not shown are connected to the electrodes 12a and 12b to supply DC power to the motor 11.

[0149] The outer cylinder 36 has a convex portion 36a formed on the upper and lower sides thereof for fitting into the concave portion of the elastic body 48. On the other hand, a concave portion 36b is formed on the left and right sides (the right side is not shown in the figure) of the outer cylinder 36 so that the elastic body 48 having a substantially rectangular shape is buried more than half in the radial direction. The elastic body 48 mounted on the concave portion 36b and the elastic body 48 mounted on the convex portion 36a are provided as the same part, but are mounted in opposite directions such that the mounting directions are radially outward and inward. In addition, the shape or mounting direction of the elastic body 48, and the positions or numbers of the concave portion 36b and the convex portion 36a are arbitrary, and other well-known mounting methods or buffer mechanisms may also be used.

[0150] The outer surface of the housing is exposed in the air passage as the motor exposed portion 38, about the rear half of the motor 11 (the front half based on the direction of the blower 1). The motor 11 has a cooling fan 14 inside, and the cooling fan 14 is used to draw air from the rear suction hole 15c (see FIG. Figure 3 ) sucks air and is discharged to the outside through the opening 13 in the radial direction through the cooling fan 14. Here, if the diameter of the motor is set to D m, then the diameter D of the inner cylinder 32 2 Slightly larger than the motor diameter D m Specifically, the diameter D 2 Let the diameter of the motor be D m Add twice the thickness of the inner cylinder 32 and the clearance required for installation. The diameter D of the outer cylinder 36 of the motor bracket 30 is 1 Constructed to be sufficiently larger than the diameter D 2 . Diameter D 1 Can be set to diameter D 2 The axial length L of the outer cylinder portion 36 of the motor bracket 30 is about 1.5 to 3 times, and is set to about 2 times in this case. 2 The length L in the axial direction of the motor 11 and the length L in the axial direction of the inner cylinder 32 are configured to be greater than 1 By adjusting the balance between the positions of the inner cylinder 32 and the outer cylinder 36 , the center of gravity of the motor 11 , and the position of the bearing bracket 15 b , the motor 11 is stably held at the axial center position inside the housing 2 .

[0151] Fig. 9 for Figure 8 A three-dimensional view of a motor bracket 30 monomer. Fig. 9 The sizes of the inner cylinder 32, the middle cylinder 34, and the outer cylinder 36 of the motor bracket 30, as well as the positional relationship between the radial ribs 33 and the second stator blades 35 connecting these cylinders can be understood. The rear surface side of the inner cylinder 32 is closed by the rear wall 31 extending in the radial direction. The central axis of the rear wall 31 is formed with a bearing bracket 15a (see Figure 8 ) is formed with an opening 31a extending therethrough. Furthermore, two threaded holes 31b are formed radially outwardly of the opening 31a. The middle cylinder portion 34 and the outer cylinder portion 36 have the same length in the axial direction. Eight radial ribs 33 are arranged at equal intervals in the circumferential direction, and seven second stationary blades 35 are arranged at equal intervals in the circumferential direction. The outer cylinder portion 36, the middle cylinder portion 34, the inner cylinder portion 32, the second stationary blades 35, and the radial ribs 33 constitute a second rectifying portion. Furthermore, the radial rib 33 is an example of a first rib, and the second stationary blade 35 is an example of a second rib.

[0152] The second stator blade 35 is a fan formed in a manner that the position of the axis A1 changes toward the circumferential direction. It is arranged at an inclination compared to the radial rib 33, and guides the air discharged from the fan 16 from the rear side while rotating toward the front side. Here, the second stator blade 35 is formed by the following parts, namely: a plane portion 35a, which is orthogonal to the axis A1; and a curved portion 35b, which is located in the front direction of the axis A1 as it moves from the connecting portion of the plane portion 35a to the circumferential direction and the same direction as the rotation direction of the fan 16. In addition, the purpose of setting the second stator blade 35 is to smoothly guide the air discharged from the fan 16 to the front side. Therefore, as long as the above purpose can be achieved, the second stator blade 35 may not be formed by only the plane portion 35a and the curved portion 35b, but may be realized by other shapes. The opening portion 39b serving as an air passage is formed between the adjacent second stator blades 35, and the air flows in the direction of the arrow F2.

[0153] Fig.10 for Figure 4 AA section. In the fan housing 3, the motor bracket 30 is sandwiched between the left and right parts of the left-right split housing 2. Therefore, the outer cylinder 36 of the motor bracket 30 is in contact with the inner wall of the fan housing 3 or in contact via an elastic body. In radial view, seven second stationary blades 35 are formed between the outer side of the middle cylinder 34 and the inner circumference of the outer cylinder 36, and the space between adjacent second stationary blades 35 becomes an opening 39b for air flow. The second stationary blades 35 not only have the function of a guide plate for guiding the air flow in a predetermined direction, but also function as a frame connecting the outer side of the middle cylinder 34 and the inner circumference of the outer cylinder 36. The space between the outer side of the inner cylinder 32 and the middle cylinder 34 is not the main space for air flow, so radial ribs 33 are provided, which become the skeleton for firmly holding the housing portion (inner cylinder 32) of the motor 11 in the motor bracket 30. The radial ribs 33 are planar and extend in the radial and axial directions, and eight of them are formed at equal intervals in the circumferential direction. The distance between the outer side of the inner tube 32 and the middle tube 34 is arbitrary, so compared with Fig.10 In the case where the opening 39b serving as the air passage is to be further enlarged, the diameter of the middle cylinder 34 can be reduced, the second stationary blade 35 can be extended in the radial direction, and the radial size of the opening 39b can be increased.

[0154] According to the embodiment described above, the first rectifying portion 20 (21 to 24) is formed on the inner circumference of the fan housing 3, so that the swirling component in the air flow discharged from the fan 16 can be attenuated, the air flow in the fan housing 3 can be smoothed, and the air supply performance of the blower 1 can be improved. In addition, the second stator blades 35 are formed on the motor bracket 30, so that the turbulence of the wind discharged from the fan 16 can be reduced. Furthermore, the second stator blades 35 are formed integrally with the motor bracket 30, so that in the case of changing the motor 11 used and adding a product change, only the shape of the motor bracket 30 needs to be changed, so the cost of design change can be reduced.

[0155] The present invention has been described above based on the embodiments, but the present invention is not limited to the embodiments, and various changes can be made within the scope of the main purpose. For example, in the embodiments, the blower is used to describe the example of the air blower, but a filter type or cyclone type cleaner is also a type of air blower, and the present invention can be applied to its housing structure. In this case, the first stationary blade portion can be provided on the inner wall portion on the downstream side of the exhaust from the fan.

Claims

1. A blower, characterized in that: include: A motor having a rotating shaft and a bearing support; a fan that is rotated by the driving force of the motor to generate an air flow; a cylindrical motor holder formed in a cylindrical shape extending in the axial direction of the rotating shaft and holding the motor radially inward; and The fan case is formed into a cylindrical shape extending in the axial direction and forms a flow path for the air flow generated by the fan and flowing in the axial direction. The fan housing comprises: A thick diameter portion, accommodating the motor, the motor bracket, and the fan; a cylindrical top end portion having an opening, the opening being configured to have a smaller diameter than the large diameter portion and passing through the axis of the rotating shaft; a conical portion connecting the large diameter portion and the tip portion and contracting in such a manner that the diameter thereof decreases as the distance from the large diameter portion in the axial direction increases; and The motor support rib is integrally formed on the conical portion in a manner of protruding inwardly from the inner circumferential surface of the conical portion. The motor support rib abuts against the bearing bracket via a damper and supports the bearing bracket.

2. The blower according to claim 1, characterized in that: The axial length of the motor bracket is shorter than that of the motor.

3. The blower according to claim 1, characterized in that: The fan case is formed by two members divided in the left-right direction perpendicular to the axial direction. The motor supporting rib extends along the left-right direction.

4. The blower according to claim 3, characterized in that: The motor includes a covered portion whose radial outer side is covered by the motor bracket, and an exposed portion whose radial outer side is not covered by the motor bracket.

5. The blower according to claim 1, characterized in that: The motor mount has a second rectifying portion.

6. The blower according to claim 5, characterized in that: The second rectifying portion is formed at a second supporting portion of the motor and the fan housing that abuts against and supports the motor.

7. The blower according to claim 6, characterized in that: The second rectifying portion abuts against the fan case via an elastic body.

8. The blower according to claim 5, characterized in that: The second flow-rectifying portion includes a first rib extending in the radial direction and a second rib extending obliquely in the axial direction.

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