JPH0510296A - Air blower - Google Patents

Abstract

PURPOSE:To restrict increase of the air blowing noise and deviation of the air blowing performance of an air blower by composing an air blower of vanes, an orifice surrounding the periphery of the discharge side of the vanes, and a cylindrical ring surrounding the periphery of the suction side of the periphery of the vanes, which is not surrounded by the orifice. CONSTITUTION:In the case that an air blower 12 is operated under the condition that a draft resistance point is higher than a design operating point, the air flow W1 blown out from the suction side 5a to the periphery of the vane 5 is separated from the air flow X1 flowing from the periphery at the peripheral part 5b of the vane 5 to restrict the collision thereof by surrounding the periphery of the suction side 5a of the vane 5 with a cylindrical ring 13. Or, a part of the air flow W1 passes between the inner wall 13a of the ring 13 and the peripheral part 5b to return to the suction side 5a, and is sucked to the inside of an impeller 3 again. Next, since the air flow blown from a space between the ring 13 and an orifice 6 is pulled to the suction side 5a with the air flow X1 by the viscosity of the air flow sucked from the suction side 5a and combined with the air flow of the suction side to be sucked to the impeller 3, in the case of the operation of the air blower 1 under the described condition, increase of the air blowing noise and deviation of the air blowing performance are restricted.

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 for 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 axial-flow type blower, and FIG. 6 shows the structure of an outdoor unit of a separate type air conditioner equipped with a conventional axial-flow type blower. .

In the figure, reference numeral 1 is an axial flow type blower,
2 is a motor. Reference numeral 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, and 6 is an orifice surrounding the outer circumference of the discharge side 5c of the blade 5. Reference numeral 7 denotes a box body 8, a heat exchanger 9 provided on the suction side of the blower 1, a compressor 10 provided inside the box body 8, and a fan guard 11 provided on the discharge side of the blower 1. Is an outdoor unit of a separate type air conditioner.

The operation of the axial-flow type blower configured as described above will be described below. First, when the impeller 3 is rotated in a predetermined rotation direction by the motor 2, the air that has passed through the heat exchanger 9 and has undergone heat exchange flows into the impeller 3 and the impeller 5
The static pressure and dynamic pressure are added by the action of and are discharged to the outside of the impeller 3 to perform a blowing action.

[0006]

However, in the above-mentioned configuration, as shown in FIG. 7, the outdoor unit 7 having the blower 1 is installed in a small installation space where the equipment is downsized and the discharge side has no margin. When the blower 1 is operated under conditions where the ventilation resistance is higher than the design operating point, such as when installed, under the conditions as described above, the flow from the suction side 5a of the blades 5 of the impeller 3 as shown in FIG. The axial velocity component of the air flow is reduced,
Since the velocity component in the radial direction increases, the flow W1 is inclined to the outer peripheral side, blows to the outer periphery of the blade 5 not surrounded by the orifice 6, and collides with the airflow X1 flowing from the outer periphery. The flow is greatly disturbed.

Further, the inflow of the air flow X1 from the outer circumference is obstructed. Therefore, the turbulent sound generated from the impeller 3 increases,
The blower noise of the blower 1 was increased and the blower performance was also deteriorated. Therefore, when the blower 1 is operated under the condition that the ventilation resistance is higher than the design operation point, there is a problem that the blower noise of the blower 1 is increased and the deterioration of the blower performance must be suppressed.

In view of the above problems, the present invention has an advantage that, when the blower is operated under the condition that the ventilation resistance is higher than the design operating point, the airflow flowing from the suction side of the impeller blows out to the outer periphery of the impeller, (EN) Provided is a blower which prevents collision with an air flow flowing from the outer periphery at the outer peripheral portion and suppresses deterioration of blower performance as well as an increase in blower noise of the blower.

[0009]

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. And an orifice surrounding the discharge side outer circumference of the blade, and a cylindrical ring surrounding the suction side circumference of the blade not surrounded by the orifice.

The diameter of the ring is slightly larger than the inner diameter of the orifice.

[0011]

With this configuration, when the blower is operated under conditions where the ventilation resistance is higher than the design operating point, the air flow blown from the suction side of the blade to the outer periphery is separated from the air flow flowing from the outer periphery at the outer peripheral portion of the blade. Collision is suppressed, and a part of the airflow blown to the outer periphery passes through between the inner wall of the cylindrical ring and the blade, returns to the suction side of the blade, and is sucked into the impeller again. Further, the airflow blown from between the ring and the orifice is attracted to the suction side of the blade due to the viscosity of the airflow sucked from the suction side of the blade together with the inflow airflow on the outer peripheral side, and joins with the airflow of the suction side into the impeller and is sucked. Be done.

Further, by making the diameter of the ring slightly larger than the inner diameter of the orifice, the air flow blown to the outer periphery is more positively formed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment 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.

FIGS. 1 and 2 show the structure of an axial flow type blower according to an embodiment of the present invention, and FIG. 3 shows a separate type in which the axial flow type blower according to one embodiment of the present invention is mounted. The structure of the outdoor unit of an air conditioner is shown.

In the figure, reference numeral 12 designates a motor 2 and a motor 2
An impeller 3 including a hub 4 attached to the blade 4 and a plurality of blades 5 provided around the hub 4, and a discharge side 5 of the blade 5.
Orifice 6 surrounding the outer circumference of c and orifice 6 of blade 5
It is an axial flow type blower composed of a cylindrical ring 13 surrounding the outer circumference of the suction side 5a among the outer circumferences not surrounded by.

At this time, the diameter of the ring 13 is made slightly larger than the inner diameter of the orifice 6 so that the air flow is narrowed.

The operation of the impeller of the axial flow type blower configured as described above will be described below.

First, when the impeller 3 is rotated in a predetermined rotation direction by the motor 2, the air that has passed through the heat exchanger 9 and has undergone heat exchange flows into the impeller 3 and the vanes 5 act to cause static pressure and dynamic movement. A pressure is applied and the air is discharged to the outside of the impeller 3 and the blower 12 performs a blowing action.

Here, when the blower 12 is operated under the condition that the ventilation resistance is higher than the design operating point as shown in FIG.
As shown in FIG. 2, the airflow W1 blown from the suction side 5a of the blade 5 to the outer periphery of the blade 5 is prevented from being separated from and colliding with the airflow X1 flowing from the outer periphery at the outer peripheral portion 5b of the blade, and
A part of the airflow W1 passes between the inner wall 13a of the cylindrical ring 13 and the outer peripheral portion 5b of the blade 5, returns to the suction side 5a of the blade 5, and is sucked into the impeller 3 again.

At this time, since the airflow seems to be narrowed due to the difference in diameter between the ring 13 and the orifice 6, the ring 13
The airflow blown from between the nozzle 6 and the orifice 6 is attracted to the suction side 5a of the blade 5 by the viscosity of the airflow sucked from the suction side 5a of the blade 5 together with the inflow airflow X1 on the outer peripheral side, and the airflow of the suction side to the impeller 3 is obtained. Is joined and sucked.

As described above, according to the present embodiment, when the blower 12 is operated under the condition that the ventilation resistance is higher than the designed operating point by surrounding the outer periphery of the suction side 5a of the blade 5 with the cylindrical ring 13. From the suction side 5a of the blade 5 to the blade 5
The airflow W1 that blows to the outer periphery of the blade 5 is suppressed from colliding by being separated from the airflow X1 flowing from the outer periphery at the outer peripheral portion 5b of the blade 5,
Moreover, a part of the air flow W1 is the inner wall 13 of the cylindrical ring 13.
It passes through between a and the outer peripheral part 5b of the blade 5, returns to the suction side 5a of the blade 5, and is sucked into the impeller 3 again.

Further, the airflow blown from between the ring 13 and the orifice 6 is accompanied by the airflow X1 on the outer peripheral side and the viscosity of the airflow sucked from the suction side 5a of the blade 5 due to the viscosity of the blade 5.
Is attracted to the suction side 5a, and the impeller 3 merges with the air flow on the suction side and is sucked. Therefore, when the blower 12 is operated under the condition that the ventilation resistance is higher than the design operating point, it is possible to suppress an increase in the blowing noise of the blower 12 and also to suppress the deterioration of the blowing performance.

[0023]

As described above, the present invention has an impeller including a motor, a hub attached to the motor, and a plurality of blades provided around the hub, and a discharge side of the blade. The blower operates under the condition that the ventilation resistance is higher than the design operating point, by configuring the orifice surrounding the outer circumference of the fan and the cylindrical ring surrounding the suction-side outer circumference of the blade not surrounded by the orifice. If
Prevents the airflow that flows in from the suction side of the impeller from blowing out to the outer circumference of the impeller and colliding with the airflow that flows from the outer circumference at the outer circumference of the impeller, suppressing the blower noise of the blower and suppressing the deterioration of blower performance. be able to.

By making the diameter of the ring slightly larger than the inner diameter of the orifice, the air flow blown to the outer periphery can be more positively formed.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view of the essential parts of the present invention when the blower is operated under the condition that the ventilation resistance is higher than the design operating point.

FIG. 3 is a cross-sectional view of an outdoor unit of a separate type air conditioner equipped with an axial flow type blower according to an embodiment of the present invention.

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

FIG. 5 is a cross-sectional view of a conventional main part when a blower is operated under a condition where ventilation resistance is higher than a design operating point.

FIG. 6 is a sectional view of an outdoor unit of a separate type air conditioner equipped with a conventional axial-flow blower.

FIG. 7 is an aerodynamic characteristic diagram showing design operating points and operating operating points of an axial-flow type blower and a conventional axial-flow type blower according to an embodiment of the present invention.

[Explanation of symbols]

2 motor 3 impeller 4 hubs 5 feathers 5a Suction side 5c Discharge side 6 orifices 12 blower 13 ring

Claims (2)

[Claims] 1. An impeller composed of a motor, a hub attached to the motor, and a plurality of blades provided around the hub, an orifice surrounding an outer circumference of the blade on the discharge side, and A blower composed of a cylindrical ring that surrounds the outer circumference of the suction side of the outer circumference of the blade that is not surrounded by the orifice. 2. The blower according to claim 1, wherein the diameter of the ring is set to be slightly larger than the inner diameter of the orifice.