JPH05126094A - Air blower - Google Patents

Abstract

PURPOSE:To improve a decrease in blasting noise and blasting performance by fixing orifice rings to outer part tips at the discharge sides of blades and by providing plate-like ribs at both the negative pressure surface side and the pressure surface side at the outer end parts of the blades surrounded with no orifice rings. CONSTITUTION:The impeller 3 of an air blower 1 comprises a hub 4 mounted on a motor 2, and a plurality of blades 5 provided around the hub 4. In this case, orifice rings 8 are fixed to the outer end parts 5d at the discharge sides 5c of the blades 5. The orifice rings are unitedly rotated with the impeller 3. Meanwhile, plate-like ribs 9a, 9b are provided at both the negative pressure surface side and the pressure surface side at the outer end parts of the blades 5 surrounded with no orifice rings 8. A turbulent flow boundary layer generated on the surfaces of the orifice rings 8 are discharged outside the impeller 3 without disturbing the turbulent flow boundary layer. This inhibits an increase in blasting noise caused by turbulent flow at the outer part of the impeller 3 and deterioration in blasting performance respectively.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art In recent years, blowers such as axial blowers have been widely used as blowers such as separate type air conditioners from commercial use to household use, and are being used for downsizing of equipment and diversification of equipment installation conditions. Accordingly, there is a tendency for higher performance and lower noise.

The conventional blower described above will be described below with reference to the drawings. 4 and 5 show the structure of a conventional blower. In the figure, 1 is a mixed-flow blower, 2 is a motor, and 3 is an impeller composed of a hub 4 attached to the motor 2 and a plurality of blades 5 provided around the hub 4. , 6 are the discharge sides 5 of the blades 5.
It is an orifice that surrounds the outer circumference of c. Reference numeral 7 denotes a panel which is arranged on the discharge side of the impeller 3 and deflects the air flow discharged from the blades 5 in a substantially axial direction in a substantially radial direction.

The operation of the blower configured as above will be described below. First, the impeller 3 is driven by the motor 2.
When is rotated in a predetermined rotation direction, air flows into the impeller 3, and static pressure and dynamic pressure are added by the action of the blades 5 and the air is discharged to the outside of the impeller 3 and is substantially axially moved by the panel 7. The discharged airflow is deflected in a substantially radial direction and blows out of the blower 1 to perform an air blowing action.

[0005]

However, in the above configuration, the inside of the impeller of FIG. 7 is shown in which the magnitude of the velocity vector of the air flow is indicated by the size of the arrow and the magnitude of the velocity fluctuation is indicated by the size of the circle. As shown in the schematic view of the air flow inside the fan of FIG. 6 based on the vector of the air flow of the fan and the measurement result of the speed fluctuation, the panel 7 is installed on the discharge side of the impeller 3 and the air flow discharged from the impeller 3 is substantially axis-shaped. Since the air is deflected in the substantially radial direction from the flow direction, a high static pressure condition is set for the blower 1, and the impeller 3
The airflow flowing from the suction side 5a of the blade 5 also has an axial velocity component that decreases and a radial velocity component that increases, so that it becomes a flow that is inclined toward the outer peripheral side, and a part of it becomes the outer peripheral portion 5b of the blade 5.
From the vicinity of the pressure surface side 5b1 and the vicinity of the negative pressure surface side 5b2 to the outer periphery not surrounded by the orifices 6 of the blades 5, and the flow sucked from the center between the blades of the impeller 3 is caused.

In particular, the negative pressure surface side 5b of the outer peripheral portion 5b of the blade 5
The air flow W1 blown from the vicinity of 2 to the outer circumference has a pressure distribution between the blades of the impeller 3 that is high on the pressure surface side and low on the suction surface side, so that the velocity of the air flow is high and the flow is disturbed due to the development of the boundary layer. Become. Further, this air flow W1 disturbs the air flow W2 blown from the vicinity of the pressure surface side 5b1 of the outer peripheral portion 5b of the blade 5 to the outer periphery to become a large turbulent flow, which is sucked from the center between the blades of the impeller 3 and the outer peripheral portion 5b of the blade 5. The flow is greatly disturbed by.

Also in the portion of the blade 5 surrounded by the orifice 6, the pressure surface side 5b of the outer peripheral portion 5b of the blade 5 is
The airflow W3 that blows out from the vicinity of 1 through the outer peripheral end 5d of the blade 5 and the orifice 6 to the vicinity of the negative pressure surface side 5b2 causes the outer peripheral end 5d of the blade 5 and the orifice 6 to approach and interfere with each other. 5 is disturbed at the time of passing the outer peripheral end 5d of the blade 5, and the flow sucked into the surface of the orifice 6 from the outer periphery of the blade 5 is bent from the radial direction to the axial direction to disturb the turbulent boundary layer, and The flow is greatly disturbed at the outer peripheral portion 5b of the blade 5 in the enclosed portion.

Therefore, there is a problem that the blowing performance of the impeller 3 is deteriorated and the turbulent sound generated is increased.

In view of the above problems, the present invention provides a blower having a panel for deflecting the air flow discharged to the discharge side of an impeller from a substantially axial direction to a substantially radial direction under high static pressure conditions. Part of the airflow flowing in from the suction side of the impeller blows out from the vicinity of the pressure surface side and the vicinity of the negative pressure surface of the blade outer periphery to the outer circumference of the impeller not surrounded by the orifice, respectively. The turbulent flow is generated on the surface of the orifice by preventing the flow sucked from the center of the blade of the impeller and by passing the air flow between the outer peripheral edge of the blade and the orifice even in the part surrounded by the orifice. It is intended to provide a blower which prevents disturbance of a boundary layer and suppresses deterioration of blower performance and increase of blower noise.

[0010]

In order to solve this problem, the blower of the present invention comprises a motor, a hub attached to the motor, and a plurality of blades provided around the hub. An impeller, an orifice ring fixed to the tip of the discharge-side outer peripheral portion of the blade, and attached to both the negative pressure surface side and the pressure surface side of the outer peripheral end portion of the blade not surrounded by the orifice ring. And a plate-shaped rib.

[0011]

With this configuration, the blower having a panel for deflecting the air flow discharged on the discharge side of the impeller from the substantially axial flow direction to the substantially radial direction is used under high static pressure conditions. In this case, the flow velocity of the airflow from the vicinity of the suction surface of the outer peripheral portion of the blade is suppressed to suppress the flow of the turbulent flow to the outer periphery of the impeller not surrounded by the orifice, and from the vicinity of the outer peripheral portion of the pressure surface to the outer periphery. Prevents disturbing the airflow that blows out, allows the airflow to smoothly flow in from the outer circumference, suppresses turbulence of the flow on the outer circumference side, and because the orifice ring is fixed to the tip of the outer circumference on the discharge side of the blade. The turbulent boundary layer generated on the surface of the orifice ring does not pass between the outer peripheral edge of the blade and the orifice ring even in the part surrounded by the orifice ring, which rotates integrally with the impeller. Stirring From being prevented, the air flow is discharged out of the impeller.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. In addition, in order to avoid duplication, the same components as those of the conventional example will be denoted by the same reference numerals and description thereof will be omitted.

1 and 2 show the structure of a blower according to an embodiment of the present invention. In the figure, 8 is an orifice ring, which is an outer peripheral end 5d of the discharge side 5c of the blade 5.
It is fixed to and rotates integrally with the impeller 3. 9a,
9b, the rib height increases sequentially from the suction side 5a to the discharge side 5c of the blade 5 attached to both the negative pressure surface side and the pressure surface side of the outer peripheral end portion 5d of the blade 5 not surrounded by the orifice ring 8. It is a plate-like rib and is formed in a shape that smoothly connects to the orifice ring 8. The operation of the impeller of the blower configured as above will be described below.

First, when the impeller 3 is rotated in a predetermined rotation direction by the motor 2, air flows into the impeller 3, and static pressure and dynamic pressure are added by the action of the blade 5 to the outside of the impeller 3. The airflow that is discharged and discharged in the substantially axial direction by the panel 7 is deflected in the substantially radial direction and blows out to the outside of the blower 1 to perform a blowing operation.

Here, as shown in FIG. 3, an airflow W1 in which the velocity of the airflow is disturbed from the vicinity of the suction surface 5b2 of the outer peripheral portion 5b of the blade 5 is attached to the suction surface side of the outer peripheral end 5d of the blade 5. The airflow W that is suppressed by the plate-shaped ribs 9a and does not blow out to the outer circumference of the impeller 3 that is not surrounded by the orifice ring 8 but blows to the outer circumference from the vicinity of the pressure surface side 5b1 of the outer peripheral portion 5b.
2 is prevented from disturbing, the airflow sucked from the outer periphery from the center of the blade is also smoothly flowed in, and the turbulence of the flow on the outer peripheral side is also suppressed. Further, the pressure surface side 5b of the outer peripheral portion 5b of the blade 5
The airflow W2 blown from the vicinity of 1 to the outer periphery is suppressed by the plate-shaped rib 9b attached to the pressure surface side of the outer peripheral end portion 5d of the blade 5, and the impeller 3 not surrounded by the orifice ring 8 is provided.
Flow to the discharge side without blowing out to the outer circumference.

Further, since the orifice ring 8 is fixed to the outer peripheral end 5d of the discharge side 5c of the blade 5 and rotates integrally with the impeller 3, the outer peripheral end 5d of the discharge side 5c of the blade 5 and the orifice ring 8 are formed. Since the airflow W3 does not pass through the space and flows on the pressure surface side 5b1, the airflow W3 is discharged to the outside of the impeller 3 without disturbing the turbulent boundary layer generated on the surface of the orifice ring 8.

As described above, rib heights are successively increased from the suction side 5a to the discharge side 5c of the blade 5 on both the suction surface side and the pressure surface side of the outer peripheral end portion 5d of the blade 5 which is not surrounded by the orifice ring 8. The plate-shaped ribs 9a and 9b that become higher are attached, and the orifice ring 8 is attached to the discharge side 5c of the blade 5.
By being fixed to the outer peripheral end 5d and rotating integrally with the impeller 3, the airflow W1 in which the velocity of the airflow is disturbed from the vicinity of the suction surface 5b2 of the outer peripheral portion 5b of the blade 5 is not surrounded by the orifice 6. It does not blow out to the outer circumference of the impeller 3, prevents disturbance of the air flow W2 blown from the vicinity of the pressure surface side 5b1 of the outer circumference 5b to the outer circumference, and suppresses turbulence of the flow on the outer circumference side, and also the suction side of the impeller 3 It is possible to suppress a flow of a part of the airflow flowing in from the vicinity of the pressure surface of the outer peripheral portion of the blade to the outer periphery of the impeller not surrounded by the orifice and to be sucked from the center between the blades of the impeller. Furthermore, the discharge side 5 of the blade 5
Since the air flow does not pass between the outer peripheral end 5d of c and the orifice ring 8, it is possible to prevent the turbulent boundary layer generated on the surface of the orifice ring 8 from being disturbed.

Therefore, it is possible to suppress an increase in blast noise due to the turbulence of the flow in the outer peripheral portion 5b of the blade 5, and to suppress deterioration of the blast performance of the blower 1.

In this embodiment, the oblique flow type blower has been described as an example, but the same effect can be obtained with an axial flow type blower.

[0020]

As described above, the blower of the present invention includes the motor, the hub attached to the motor, the impeller including the plurality of blades provided around the hub, and the blade. An orifice ring fixed to the tip of the outer peripheral portion on the discharge side, and plate-shaped ribs attached to both the negative pressure surface side and the pressure surface side of the outer peripheral end portion of the blade not surrounded by the orifice ring. By doing so, it is possible to suppress an increase in blowing noise due to the turbulence of the flow in the outer peripheral portion of the blade and to suppress deterioration of the blowing performance of the blower.

[Brief description of drawings]

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

FIG. 2 is a side view of the blower shown in FIG.

FIG. 3 is an enlarged view of a main part showing a state of air flow of a mixed flow type blower according to an embodiment of the present invention.

FIG. 4 is a cross-sectional view of a conventional mixed-flow blower.

5 is a side view of the blower shown in FIG.

FIG. 6 is an enlarged view of a main part showing a state of air flow of a conventional mixed-flow blower.

FIG. 7 is an enlarged view of a main part showing an airflow velocity vector and velocity fluctuation measurement results inside an impeller of a conventional mixed-flow blower.

[Explanation of symbols]

 1 Blower 2 Motor 3 Impeller 4 Hub 5 Blade 8 Orifice ring 5d Outer peripheral end 9a Negative pressure side rib 9b Pressure side rib

Claims (1)

[Claims] 1. An impeller composed of a motor, a hub attached to the motor, and a plurality of blades provided around the hub, and fixed to the tip of the outer peripheral portion of the blade on the discharge side. And a blower having plate-shaped ribs attached to both sides of the negative pressure surface side and the pressure surface side of the outer peripheral end of the blade not surrounded by the orifice ring.