JP2006214371A - Blower - Google Patents

Abstract

An object of the present invention is to provide a blower that achieves low power consumption with low noise.
A cross section in which an outer peripheral side is concaved on a suction surface side of an outer peripheral end portion of an impeller, and an impeller composed of a hub and a plurality of blades provided around the hub. Is provided with a substantially U-shaped groove 5, and the heights H 1, H 2,... Hn of the groove 5 are equal to each other, so that the vortex generated in the blade 2 is not separated but the blade 2 Since it adheres to the blades 2 up to the trailing edge, it does not collide with the next blade in the rotational direction, and this makes it possible to reduce noise and improve blowing efficiency.
[Selection] Figure 1

Description

  The present invention relates to a blower, and more particularly to an axial fan.

  In an outdoor unit of an air conditioner, an axial blower fan is used.

  A conventional blower is shown in FIGS. 5 to 8 (see, for example, Patent Document 1).

  As shown in FIG. 8, a general blower 1 of this type includes a hub 4, a blade trailing edge 2c provided around the hub 4 in the air outflow direction, and a blade leading edge in the air introduction direction. A blade outer peripheral portion 2d that forms an outer periphery with a portion 2b, and the outline α of the blade trailing edge portion is composed of a plurality of blades 2 formed with reverse arc-shaped edges that are concave in the introduction direction from the air outflow direction The impeller 3 is provided.

The blade trailing edge vortex shown in FIG. 6, that is, the vortex caused by the flow from the pressure surface to the suction surface of the blade at the trailing edge of the next blade in the rotational direction as shown in FIG. The noise reduction of the blower is achieved without collision and noise generation.
Japanese Patent Laid-Open No. 2002-257088

  However, in the above-described conventional configuration, the chord length in the vicinity of the hub is shortened due to the reverse arc shape, so that the amount of work increases and the rotational speed for obtaining a predetermined air volume increases, leading to an increase in power consumption of the motor.

  The present invention solves the above-described conventional problems, and an object of the present invention is to provide a blower that is low in noise and reduces power consumption.

  In order to solve the conventional problems, a blower according to the present invention includes a motor, a hub attached to the motor, and an impeller composed of a plurality of blades provided around the hub, and the blade The cross section with the concave outer periphery on the suction surface side of the outer peripheral end of the car is configured with a substantially U-shaped groove to suppress the separation of vortices generated by the blades, thereby reducing noise and blowing efficiency It becomes possible to improve.

  In the blower of the present invention, each maximum height of the groove is expanded from the front edge to the rear edge of the blade.

As a result, a large vortex at the time of a large air volume or high static pressure can be absorbed, thereby reducing noise and improving air blowing efficiency.
Moreover, the air blower of this invention provided the said groove | channel from the approximate center of a blade | wing to the rear edge. As a result, the blades can be used in the conventional form up to the vicinity of the vortex separation, and the vortex separation region can be brought into a vortex separation prevention state, and a better performance can be obtained. It becomes.

  As described above, the blower of the present invention can reduce noise and improve blowing efficiency.

  In a first aspect of the present invention, there is provided an impeller including a motor, a hub attached to the motor, and a plurality of blades provided around the hub, and a suction surface side of an outer peripheral end portion of the impeller. This is a groove with a substantially U-shaped cross section with a concave outer periphery. By making this configuration, it is possible to suppress the vortex generated by the wings from peeling off, and to reduce noise and improve air blowing efficiency. Is possible.

  In the second invention, the maximum heights of the grooves of the first invention are particularly enlarged from the leading edge to the trailing edge of the blade. By making this configuration, the maximum height at the time of large air flow or high static pressure is large. It is possible to absorb vortices, further reduce noise and improve air blowing efficiency.

  In the third invention, the groove of the first invention is provided from the substantially center to the rear edge of the blade, and this configuration makes it possible to provide a groove only in a portion where vortex separation is large and obtain better performance. Therefore, it is possible to reduce noise and improve air blowing efficiency.

  Embodiments of the present invention will be described below with reference to FIGS. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
1 to 2 show a blower of (Embodiment 1) of the present invention.

  An impeller 3 composed of a hub 4 and a plurality of blades 2 provided around the hub 4, and a substantially U-shape having a concave outer peripheral side on the suction surface side of the outer peripheral end 6 of the impeller 3. The groove 5 is provided.

  As shown in FIG. 1, the heights H1, H2,.

  As shown in FIG. 2, the vortex generated in the wing is not separated but attached to the blade to the trailing edge of the blade as shown in FIG. 2, so that it does not collide with the next blade in the rotational direction, thereby reducing noise. It becomes possible to improve ventilation efficiency.

(Embodiment 2)
FIG. 3 shows a blower according to Embodiment 2 of the present invention.

  The first embodiment is different from the first embodiment in that the heights H1, H2,... Hn of the grooves increase from the front edge to the rear edge of the blade as shown in FIG.

  This does not prevent the vortex from developing from the leading edge to the trailing edge, and the vortex is not separated but attached to the blade until the trailing edge of the blade, so it does not collide with the next blade in the direction of rotation. It becomes possible to reduce noise and improve blowing efficiency.

(Embodiment 3)
FIG. 4 shows a blower according to Embodiment 3 of the present invention.

  As shown in FIG. 4, the first embodiment is different from the first embodiment in that the groove does not extend from the front edge of the blade to an arbitrary position but is provided from an arbitrary position.

  This does not prevent the vortex from developing from the leading edge to the trailing edge, and the vortex is not separated but attached to the blade until the trailing edge of the blade, so it does not collide with the next blade in the direction of rotation. It becomes possible to reduce noise and improve blowing efficiency.

  As described above, since the blower according to the present invention can reduce noise and improve the blowing efficiency, it can be applied not only to an axial-flow blower for air conditioning but also to a blower such as a cooling fan or a ventilation fan.

The expanded sectional view of the air blower in Embodiment 1 of this invention Vortex flow diagram of blower of the same embodiment The expanded sectional view of the air blower in Embodiment 2 of this invention The expanded sectional view of the air blower in Embodiment 3 of this invention Expanded sectional view of a blower in a conventional blower A perspective view of a conventional blower Vortex flow diagram of conventional blower Plan view of conventional blower

Explanation of symbols

1 Blower 2 Blade 3 Impeller 4 Hub 5 Groove 6 Outer part

Claims (3)

An impeller composed of a motor, a hub attached to the motor, and a plurality of blades provided around the hub, and an outer peripheral side recessed on the suction surface side of the outer peripheral end of the impeller A blower with a substantially U-shaped cross section. The blower according to claim 1, wherein each maximum height of the groove increases from a front edge to a rear edge of the blade. The blower according to claim 1, wherein a groove is provided from substantially the center of the blade to the rear edge.

Images