JP2002339898A - Blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blower capable of improving the sucking performance. SOLUTION: The blower has a fan housing 3 with an intake 7 and an outlet 8, and an impeller 2 stored in the housing 3. Air sucked from the intake 7 by the rotation of the impeller 2 is blown out of the outlet 8. The intake 7 is formed as cylindrically projecting from the side surface of the fan housing 3, and ribs 19 are provided in the base part 7a of the intake 7. The inner diameter Y of the intake 7 on the top 19a of the ribs 19 is larger than the inner diameter X at the top end part 7b of the intake 7. The section area of the air channel on the top 19a of the ribs 19 is secured, and the quantity of sucked air is increased. Therefore, the sucking performance is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blower for blowing air sucked from a suction port by a rotating motion of an impeller from a blow port.

[0002]

2. Description of the Related Art Heretofore, there has been known a blower in which an impeller is provided in a housing having an inlet and an outlet, and air sucked from the inlet through the rotational movement of the impeller is blown from the outlet. The blower is used for blowing out dust, litter, wood chips, and the like, or suction work for collecting dust, small wood chips, and the like.

When a blower is used for the blowing operation, an accessory nozzle is attached to the outlet, and nothing is attached to the inlet. On the other hand, when using a blower for the suction work, a dust bag attached to the outlet is attached,
An accessory nozzle is attached to the suction port. The suction port formed in the housing is formed to protrude cylindrically from a side surface of the housing so that a nozzle or the like of an accessory can be attached and detached.

FIG. 9 is a sectional view of a suction port 31 formed in the fan housing 30. A mesh-shaped rib 32 is formed at the base of the suction port 31 so that a finger does not hit an impeller housed in the fan housing 30. Also,
A hook-shaped mounting groove for mounting an accessory nozzle is formed on the outer peripheral surface or the inner peripheral surface of the suction port 31 (see FIGS. 1 and 2). The protrusion formed on the nozzle 21 is fitted into a mounting groove formed on the inner peripheral surface or the outer peripheral surface of the suction port 31, and the nozzle 21 is attached to the suction port 31 by rotating the nozzle 21.

FIG. 10 shows a parting of a mold for forming the suction port 31. Between the upper mold 33 and the lower mold 34,
A cavity 35 for forming the fan housing 30 and the suction port 31 is formed. Further, a cavity 36 for forming a rib is formed in the lower mold 34. Upper mold 3
The parting lines of the lower mold 3 and the lower mold 34 are substantially located on the upper surface 32a of the rib 32 (that is, the surface on the tip end side of the rib 32). After filling the cavities 35 and 36 with resin, the upper mold 33 is pulled upward from the upper surface 32a of the rib 32, and the lower mold 34 is pulled downward.

[0006]

In a blower which goes through such a manufacturing process, the upper die 33 is attached to the upper surface 32 of the rib 32.
As shown in FIG. 9, the inner diameter X of the distal end portion 31a of the suction port 31
Is made larger than the inner diameter Y of the suction port 31 on the upper surface 32a of the upper surface. Since the inner diameter X of the distal end portion 31a of the suction port 31 is fixedly determined by the diameter of the nozzle, when X> Y, the inner diameter of the suction port 31 at the upper surface 32a of the rib 32 decreases. As a result, the cross-sectional area of the air passage at the suction port 31 is also reduced at the upper surface 32a of the rib 32, which causes a problem that the suction capacity is reduced. Particularly, since a large amount of air is sucked into the suction port 31 of the blower to increase the pressure, the influence of the passage having a smaller cross-sectional area than that of the blowout port is large.

[0007] Therefore, an object of the present invention is to provide a blower capable of improving the suction capacity.

[0008]

In order to solve the above-mentioned problems, the present inventor has designed the inside diameter of the suction port to increase from the tip to the base of the suction port. That is, the invention of claim 1 includes a fan housing having an inlet and an outlet, and an impeller housed in the fan housing, and blows out the gas sucked from the inlet by the rotational motion of the impeller. A blower that blows out of your mouth,
The suction port is formed so as to protrude from the side surface of the fan housing in a cylindrical shape, and a rib is provided at a base of the suction port. The rib is closer to the distal end than the inner diameter of the distal end of the suction port. The above-mentioned problem has been solved by a blower characterized in that the inside diameter of the suction port in terms of (1) is large.

According to a second aspect of the present invention, in the blower according to the first aspect, an inner peripheral surface of the suction port is formed to have a taper whose width gradually decreases from a rib toward a tip end of the suction port. It is characterized by being performed.

Further, according to a third aspect of the present invention, in the blower according to the first or second aspect, the suction port is disposed on an axis of the impeller, and the gas sucked from the suction port changes its direction. Flows along the inner surface of the fan housing substantially orthogonal to the axis of the impeller, and the inner surface of the fan housing around the suction port, over the entire circumference of the suction port, or partially on the entire circumference, A projection is formed to project in the axial direction of the vehicle.

According to a fourth aspect of the present invention, there is provided a fan housing having a suction port and an air outlet, and an impeller housed in the fan housing. A blower that blows out the interposed gas from the air outlet, wherein the air inlet is disposed on an axis of the impeller, and the gas sucked from the air inlet changes direction, and is substantially aligned with the axis of the impeller. A protrusion that flows along the inner surface of the fan housing orthogonal to the inner surface of the fan housing around the suction port and that protrudes in the axial direction of the impeller over the entire circumference of the suction port or at a part of the entire circumference. The above-mentioned problem has been solved by a blower characterized by being formed.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A blower according to an embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a plan view (including a partial cross section) of the blower, and FIG. 2 is a side view (including a partial cross sectional view) of the blower. The blower includes a blower main body 4 and a handle 5 coupled to the blower main body 4. This blower is used as a kind of a power tool, and is configured to be small and lightweight so as to be hand-held.

The blower body 4 includes a fan housing 3 having an inlet 7 and an outlet 8, and a fan housing 3.
It has an impeller 2 housed therein, a drive shaft 6 coupled to the impeller 2, and an electric motor 1 directly connected to the drive shaft 6. The air sucked from the suction port 7 is blown out from the blowout port 8 by the rotation of the impeller 2.

The fan housing 3 sandwiches the impeller 2 from both sides in the axial direction, and has a pair of disk-shaped side walls 16, 16 orthogonal to the axis of the impeller 2 and a peripheral wall connecting the outer peripheries of the pair of side walls 16, 16. 17 is comprised. The side walls 16, 16
The peripheral wall 17 forms a space for accommodating the impeller 2 and a spiral chamber 9 that collects air from the impeller 2 and guides the air to the outlet 8.

The suction port 7 is formed so as to protrude in a cylindrical shape from the side surface of the fan housing 3 (more specifically, the outer surface of the side wall 16) on the axis of the impeller 2. Suction port 7
The base 7a is provided with a net-like rib 19 for safety so that a finger does not hit the impeller 2 housed in the fan housing 3. A hook-shaped mounting groove 20 for mounting an accessory nozzle is formed on the inner peripheral surface of the suction port 7. The nozzle 21 is attached to the suction port 7 by fitting the protrusion 21 a formed on the nozzle 21 into the attachment groove 20 and rotating the nozzle 21. The detailed configuration of the suction port 7 will be described later (see FIGS. 3 to 5).

The outlet 8 is formed to extend from the spiral chamber 9 in the tangential direction of the impeller 2. At the tip end of the outlet 8, there is formed a mounting portion 8a to which accessories such as a dust bag or a nozzle are mounted.

On the inner surface 16 c of the fan housing 3 around the suction port 7, the impeller 2 extends over the entire circumference of the suction port 7.
Is formed in the axial direction. The projection 18 has a flat inner surface 16 c orthogonal to the axis of the impeller 2.
Projecting toward the impeller 2 by a dimension Z (see FIG. 8).
The protrusion 18 is provided between the inner surface 16 c and the inner peripheral surface 7 of the suction port 7.
c near the intersection with the inner peripheral surface 7 of the suction port 7.
It does not protrude radially inward of the suction port 7 than c. The surface shape of the projection 18 is formed in a smooth arc shape. Further, in this embodiment, the protrusion 18 is provided on the entire circumference around the suction port 7, but may be provided partially on the entire circumference of the suction port 7.

The peripheral wall 17 of the fan housing 3 is formed with a dividing surface 17a extending in a direction orthogonal to the axis of the impeller 2, and the dividing surface 17a divides the fan housing 3 into two in the direction of the axis of the impeller 2. You. Each of the divided bodies 3a and 3b of the fan housing 3 is manufactured by injection molding or the like of engineering plastics such as polycarbonate and nylon, and is joined by joining means such as bolts.

The impeller 2 housed in the fan housing 3 is a so-called centrifugal impeller that causes a sucked air to flow outwardly perpendicular to the axis of the impeller 2. Due to the rotational movement of the impeller 2, the air flowing in the suction port 7 in the axial direction of the impeller 2 changes its direction by approximately 90 degrees in the impeller 2 and flows in the radial direction of the impeller 2 (see FIG. 8).

The drive shaft 6 is fixed to the center of the impeller 2 by fixing means such as press-fitting or bolt connection. The drive shaft 6 extends to the inside of the electric motor 1. The drive shaft 6 has one end rotatably supported by a bearing provided on the electric motor 1 and the other end rotatably supported by a bearing provided on the fan housing 3.

The electric motor 1 has a substantially cylindrical motor housing 11 connected to the fan housing 3 by bolts or the like.
And the stator 1 mounted in the motor housing 11
2 and a rotor 13 coupled to the drive shaft 6 and arranged inside the stator 12.

This blower is used for performing a blowing operation or a suction operation. FIG. 3 shows a blower having a nozzle 21 attached to the outlet 8 for performing a blowing operation. 4 and 5 show a blower in which a dust collection bag 22 is attached to the outlet 8 for performing a suction operation. For example, when used for blowing out dust and small pieces of wood, an accessory nozzle 21 is attached to the blowout port 8 of the blower as shown in FIG. Then, the tip of the nozzle 21 is directed toward an object such as dust, small pieces of wood, etc.
Blow out the air with increased pressure. On the other hand, when used for a suction operation for collecting dust, small pieces of wood, and the like, an accessory dust collecting bag 22 is attached to the outlet 8 of the blower, and an accessory nozzle 21 is attached to the inlet 7. Then, the tip of the nozzle 21 is directed toward an object such as dust or small pieces of wood, and the object is sucked and collected in the dust bag 22.

FIG. 6 shows a detailed view of the suction port 7. The inner diameter Y of the suction port 7 on the upper surface 19a of the rib 19 (that is, the surface on the tip 7b side of the suction port 7) is larger than the inner diameter X of the tip 7b of the suction port 7. The inner peripheral surface 7c of the suction port 7 is formed into a taper whose width gradually decreases from the rib 19 toward the tip end 7b of the suction port 7. Here, it is most preferable that the width from the rib 19 to the tip 7d of the suction port 7 is gradually reduced. However, the width from the rib 19 to the tip 7d is gradually reduced. And 7d from the middle
It may be formed into a taper whose width gradually increases.

FIG. 7 shows a parting of a mold for forming the suction port 7 of the fan housing 3. Upper mold 23 and lower mold 2
4, a cavity 25 for forming the fan housing 3 and the suction port 7 is formed. In addition, lower mold 24
Is formed with a cavity 26 for molding the rib 19. In the vicinity of the rib 19, the parting line 27 of the upper die 23 and the lower die 24 is substantially located on the upper surface 19 a of the rib 19. In the above embodiment, the upper die 2 is located near the rib 19.
3 and the parting line 27 of the lower mold 24 are substantially located on the upper surface 19a of the rib 19, but in consideration of the ease of the deburring operation,
The parting line 27 may be located slightly on the front end portion 7b side from the upper surface 19a of the rib 19.

The edge of the inner peripheral surface 7c of the suction port 7 is mainly formed by the lower die 24, and the outer peripheral surface 24a of the lower die 24 that forms the inner peripheral surface 7c of the suction port 7 gradually approaches the tip. The taper is formed to have a narrow width. In consideration of the ease of deburring work, etc., a part 23a of the upper
Of the inner peripheral surface 7c is formed. Inner peripheral surface 7c of suction port 7
In the vicinity, the parting line 28 between the upper mold 23 and the lower mold 24 is located slightly closer to the base 7a than the tip 7d of the suction port 7. Further, the hook-shaped mounting groove 20 is provided with the upper mold 23 and the lower mold 2.
4 are formed respectively.

After filling the cavities 25 and 26 with the resin, the upper mold 23 is pulled upward from the parting lines 27 and 28, and the lower mold 34 is pulled downward.

As shown in FIG. 8, when the impeller 2 is rotated, air is sucked from the suction port 7. Since the inner diameter Y of the suction port 7 at the upper surface 19 a of the rib 19 is larger than the inner diameter X of the tip 7 b of the suction port 7, the upper surface 19
The cross-sectional area of the air passage at a can be secured, and the intake air volume can be increased. Further, since the inner peripheral surface 7c of the suction port 7 is formed in a tapered shape, the flow of the air becomes smooth, and the loss of the air volume can be reduced.

The sucked air turns 90 degrees and flows in the radial direction of the impeller 2. Since the protrusion 18 is formed at a position where the air sucked from the air inlet changes its direction by approximately 90 degrees, the flow of the air becomes smooth and the loss of the air volume can be reduced. It has been confirmed by experiments that the intake air volume increases and the sound also decreases.

It should be noted that the present invention is not limited to the blower of the above embodiment, but can be applied to the blowers of other embodiments.
For example, in the above embodiment, the mounting groove 20 is formed on the inner peripheral surface 7c of the suction port 7, and the nozzle 21 is provided inside the suction port 7.
The mounting groove 2 is provided outside the suction port 7.
0 may be formed and the nozzles may be fitted.

[0030]

According to the first aspect of the present invention, since the inside diameter of the suction port at the front end side of the rib is larger than the inside diameter of the front end of the suction port, the surface at the front end side of the rib can be reduced. The cross-sectional area of the gas passage can be ensured, and the intake air volume increases.
Therefore, the suction capacity can be improved.

According to the second aspect of the present invention, since the inside of the suction port is formed to be tapered, the flow of gas becomes smooth and the loss of air volume can be reduced. Therefore,
The suction capacity can be further improved in combination with the effect of the first aspect.

According to the third aspect of the present invention, since the gas sucked from the inlet is formed at a position where the direction of the gas changes by approximately 90 degrees, the flow of the gas becomes smooth and the loss of air volume is reduced. be able to. As a result, the intake air volume increases and the sound also decreases. Therefore, the suction ability can be further improved in combination with the effect of the first aspect.

According to the fourth aspect of the present invention, the projection is formed at a position where the gas is sucked from the suction port and turned around 90 degrees so as to flow along the inner surface of the fan housing. And the loss of air volume can be reduced. As a result, the intake air volume increases and the sound also decreases. Therefore, the suction capacity can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view (including a partial cross section) showing a blower according to an embodiment of the present invention.

FIG. 2 is a side view (including a partial cross section) of the blower.

FIG. 3 is a side view showing a blower provided with a nozzle.

FIG. 4 is a side view showing a blower to which a dust collection bag is attached.

FIG. 5 is a plan view showing a blower to which a dust bag is attached.

FIG. 6 is a sectional view of a suction port.

FIG. 7 is a close-up view of a mold.

FIG. 8 is a diagram showing the flow of air when the impeller is rotated.

FIG. 9 is a sectional view showing a conventional suction port.

FIG. 10 is a sectional view of a conventional mold.

[Explanation of symbols]

 2 Impeller 3 Fan Housing 7 Suction Port 7a Base 7b Tip 7c Inner Surface 8 Outlet 16c Inner Surface 18 Protrusion 19 Rib

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Miki Morimoto 762 Mezaki-cho, Fuchu-shi, Hiroshima Ryobi Co., Ltd. F-term (reference) 3H034 AA02 BB02 BB06 CC03 DD02 DD28 EE18

Claims (4)

[Claims] 1. A fan housing having an inlet and an outlet, and an impeller housed in the fan housing, wherein the gas sucked from the inlet by the rotational movement of the impeller is blown out from the outlet. In the blower, the suction port is formed so as to protrude in a cylindrical shape from a side surface of a fan housing, a rib is provided at a base of the suction port, and the rib is larger than an inner diameter of a tip portion of the suction port. The blower according to any one of claims 1 to 3, wherein the inner diameter of the suction port on the surface on the front end side is large. 2. The blower according to claim 1, wherein an inner peripheral surface of the suction port is formed into a taper whose width gradually decreases from a rib toward a tip end of the suction port. 3. The fan inlet is disposed on an axis of the impeller, and the gas sucked from the inlet changes its direction, and extends along an inner surface of the fan housing substantially orthogonal to the axis of the impeller. Flows on the inner surface of the fan housing around the suction port,
The blower according to claim 1, wherein a protrusion protruding in an axial direction of the impeller is formed over an entire circumference or a part of the entire circumference of the suction port. 4. A fan housing having an inlet and an outlet, and an impeller housed in the fan housing, wherein a gas sucked from the inlet by rotation of the impeller is discharged from the outlet. A blower that blows air from the fan housing, wherein the suction port is disposed on an axis of the impeller, and the gas sucked from the suction port changes its direction, and the inside of the fan housing is substantially orthogonal to the axis of the impeller. A flow that flows along the side surface, and a protrusion that projects in the axial direction of the impeller is formed on the inner surface of the fan housing around the suction port, over the entire circumference of the suction port or at a part of the entire circumference. Blower.