JP2644957B2 - Blower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blower used for an air conditioner or the like.

[0002]

2. Description of the Related Art In recent years, blowers such as axial flow blowers have been widely used as commercial type blowers such as air conditioners from business use to home use. Accordingly, there is a tendency that higher performance and lower noise are desired.

Hereinafter, the above-described conventional blower will be described with reference to the drawings. 5 to 8 show the structure of a conventional blower. In the figure, 1 is a mixed flow type blower, 2 is a motor, and 3 is an impeller including a hub 4 attached to the motor 2 and a plurality of blades 5 provided around the hub 4. Reference numeral 6 denotes an orifice surrounding the outer periphery of the discharge side 5c of the blade 5.

The operation of the blower constructed as described above will be described below. First, the impeller 3 is driven by the motor 2.
Is rotated in a predetermined rotation direction, air flows into the impeller 3, the static pressure and the dynamic pressure are applied by the action of the blade 5, the air is discharged out of the impeller 3, and blows out of the blower 1 to perform the air blowing action. Do

[0005]

However, in the above configuration, as shown in FIG. 8, the centrifugal force acting on the air flow increases at the outer peripheral portion 5b of the impeller 3, and the impeller 3 of the impeller 3 The airflow flowing from the suction side 5a also has a reduced axial velocity component and an increased radial velocity component, so that the flow is inclined toward the outer peripheral side, and a part of the flow is in the vicinity of the pressure surface side 5b1 of the outer peripheral portion 5b of the blade 5. From the vicinity of the suction side 5b2,
It blows out to the outer periphery of the blade 5 not surrounded by the orifice 6 and causes a flow to be sucked from the center between the blades of the impeller 3.

In particular, since the pressure distribution between the blades of the impeller 3 is high on the pressure surface side and low on the negative pressure surface side, the outer peripheral portion 5b of the blade 5
From the vicinity of the pressure surface side 5b1 to the outer periphery of the negative pressure surface side 5b
2 and the airflow W2 blown out from the vicinity of the suction surface side 5b2 of the outer peripheral portion 5b of the blade 5 toward the outer periphery at a certain distance, flow in opposite directions to each other, so that the suction surface side of the outer peripheral end 5d. A vortex U1 is generated at 5d2. This vortex U1 is directed from the suction side 5a to the vicinity of the orifice 6,
The vortex U1 comes into contact with the inner wall of the orifice 6 when sucked into the orifice 6, and the vortex U1 collapses, so that the flow is largely disturbed at the outer peripheral portion 5b of the blade 5 inside the orifice 6. Therefore, there is a problem that the air blowing performance of the impeller 3 is deteriorated and the generated turbulent noise increases.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention is directed to a suction surface side of an outer peripheral end portion of a blade due to an airflow circling from a pressure surface side to a suction surface side of an outer periphery of a blade not surrounded by an orifice and an airflow blowing from the vicinity of the suction surface to the outer periphery. When the vortex generated in the orifice is sucked into the orifice, it comes into contact with the inner wall of the orifice, suppresses collapse, prevents large flow turbulence on the outer periphery of the blade inside the orifice, and suppresses the increase in ventilation noise Is what you do.

[0008]

In order to solve this problem, a blower according to the present invention comprises a motor, a hub attached to the motor, and a plurality of blades provided around the hub. an impeller has, is constituted by an orifice which surrounds the outer periphery of the discharge side of the vane, surrounded by the orifice
Of the blades in the flat portion perpendicular to the rotation axis of the impeller.
When cutting at the surface, rotate the cross-sectional shape of the outer periphery of the blade
And the outer peripheral end of the blade is substantially circular.
It is inclined backward in the anti-rotation direction from the arc-shaped apex .

[0009]

With this configuration, when a vortex generated on the suction surface side of the outer peripheral end of the blade not surrounded by the orifice is sucked into the orifice, the airflow flowing from the pressure surface side of the outer peripheral portion to the suction surface side is further diverted. Since the airflow blown out from the negative pressure surface side of the outer peripheral portion is suppressed, the vortex at the outer peripheral end of the blade moves inward, does not contact the inner wall of the orifice, does not collapse, is discharged from the impeller, and Reduce flow disturbances on the side.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. The same components as those of the conventional example are denoted by the same reference numerals to avoid duplication, and description thereof is omitted.

1 to 3 show the structure of a blower according to an embodiment of the present invention. In the figure, 8 is the hub 4
8e are shown in FIG.
The outer periphery of the blade 8 outside the dotted line,
The blade 8 in the portion surrounded by the blade 6 is directly connected to the rotation axis of the impeller 3.
When cutting at the intersecting plane, the cross-sectional shape of the outer peripheral portion 8e is rotated.
It has a substantially arc shape convex in the rolling direction, and the outer peripheral end 8f has a substantially arc-shaped peak.
It is inclined backward in the anti-rotation direction from the point .

The operation of the impeller of the blower constructed as described above will be described below. First, when the impeller 3 rotates in a predetermined rotation direction by the motor 2, air flows into the impeller 3, and the static pressure and the dynamic pressure are added by the action of the blade 8 to be discharged out of the impeller 3. The panel 7 deflects the airflow discharged substantially in the axial flow direction in the substantially radial direction and blows the airflow out of the blower 1 to perform a blowing operation.

Here, as shown in FIG.
At the outer peripheral portion 8e of the blade 8 surrounded by the orifice 6
Suction side 8d of the outer peripheral end 8d of the blade 8 not surrounded by
When the vortex U1 generated in Step 2 is sucked into the orifice 6, the airflow W1 flowing from the pressure surface side 8e1 of the outer peripheral portion 8e of the blade 8 to the negative pressure surface side 8e2 becomes easier to flow,
Since the airflow W2 blown out from the negative pressure surface side 8e2 of the outer peripheral portion 8e of the blade 8 is suppressed, the blade 8 surrounded by the orifice 6 is controlled.
In the outer peripheral portion 8e, the vortex U1 moves inward from the outer peripheral end 8f, does not contact the inner wall of the orifice 6, is not collapsed, is discharged from the impeller 3, and suppresses the turbulence of the flow in the outer peripheral portion 8e.

As described above, according to one embodiment of the present invention,
The part of the blade 8 surrounded by the orifice 6 is rotated by the rotation of the impeller 3.
Cross section of outer peripheral portion 8e when cut along a plane perpendicular to the axis of rotation
The shape is a substantially arc shape convex in the rotation direction, and the outer peripheral end 8f is the outer periphery.
When the vortex U1 generated on the negative pressure surface side 8d2 of the outer peripheral end 8d of the blade 8 not surrounded by the orifice 6 is sucked into the orifice 6 by tilting backward from the substantially arc-shaped vertex of the portion 8e in the anti-rotation direction. In addition, the airflow W1 wrapping around from the pressure surface side 8e1 of the outer peripheral portion 8e of the blade 8 to the negative pressure surface side 8e2 becomes easier to wrap around, and the negative pressure surface side 8e of the outer peripheral portion 8e of the blade 8 becomes easier.
2 is suppressed, the vortex U1 is formed at the outer peripheral end 8e of the outer peripheral portion 8e of the blade 8 surrounded by the orifice 6.
move inward from f and do not contact the inner wall of the orifice 6,
Without being collapsed, the flow is discharged from the impeller 3 and the disturbance of the flow in the outer peripheral portion 8e can be suppressed.

Therefore, it is possible to suppress an increase in the blowing noise due to the disturbance of the flow at the outer peripheral portion 8e of the blade 8 surrounded by the orifice 6.

In this embodiment, an axial flow type blower has been described as an example. However, a similar effect can be obtained with a diagonal flow type blower.

[0017]

As described above, the blower of the present invention comprises an impeller comprising a motor, a hub attached to the motor, a plurality of blades provided around the hub, And an orifice surrounding the outer circumference on the discharge side,
The part of the blade surrounded by the orifice is
When cut on a plane perpendicular to the rotation axis of the car, the blades
The cross-sectional shape of the outer peripheral portion is substantially arc-shaped convex in the rotation direction,
The outer peripheral end of the blade is located in the anti-rotation direction
By inclining , when the vortex generated on the suction surface side of the outer peripheral end of the blade not surrounded by the orifice is sucked into the orifice, the air flow wrapping from the pressure surface side of the outer peripheral portion of the blade to the suction surface side is easier to turn around Since the airflow blown from the negative pressure surface side of the outer peripheral portion of the blade is suppressed, the vortex moves inward from the end at the outer peripheral portion of the blade surrounded by the orifice, does not contact the inner wall of the orifice, does not collapse Thus, the turbulence of the flow discharged from the impeller at the outer peripheral portion can be suppressed. Therefore, it is possible to suppress an increase in the blowing noise due to the disturbance of the flow at the outer peripheral portion of the blade.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an axial-flow type blower according to an embodiment of the present invention.

FIG. 2 is a plan view of an axial blower according to an embodiment of the present invention.

FIG. 3 is a side view of a main part of the blower of FIG. 1 viewed from a direction of an arrow (lateral direction).

FIG. 4 is an enlarged view of a main part showing an airflow state of the axial-flow type blower according to the embodiment of the present invention.

FIG. 5 is a sectional view of a conventional axial flow type blower.

FIG. 6 is a plan view of a conventional axial flow type blower.

FIG. 7 is a side view of a main part of the blower of FIG. 5 viewed from the direction of an arrow (lateral direction).

FIG. 8 is an enlarged view of a main part showing an airflow state of a conventional axial flow type blower.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Blower 2 Motor 3 Impeller 4 Hub 6 Orifice 8 Blade 8e Outer peripheral part 8f Outer peripheral end

 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-59-185898 (JP, A) JP-A-62-1199998 (JP, A) JP-A-1-315696 (JP, A) JP-A-5-1985 44694 (JP, A) JP-A-6-50287 (JP, A)

Claims (1)

(57) [Claims] 1. An impeller comprising a motor, a hub attached to the motor, a plurality of blades provided around the hub, and an orifice surrounding an outer periphery of a discharge side of the blade. Of the part surrounded by the orifice
The blade is cut along a plane perpendicular to the rotation axis of the impeller.
When doing, the cross-sectional shape of the outer peripheral portion of the blade is convex in the rotation direction.
And the outer peripheral end of the blade is the substantially arc-shaped top.
A blower characterized by being inclined backward in a counter-rotating direction from a point .