JP3071287B2 - Blower impeller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a blade of a blower impeller which can reduce noise of a blower composed of a plurality of blades.

[0002]

2. Description of the Related Art FIG. 6A is a perspective view of a blower impeller, and FIG. 6B is a sectional view of the impeller blade. The blower impeller a has four blades c attached to the outer periphery of a truncated conical hub portion b. Conventionally, this type of blade c uses a solid metal or resin as shown in FIG. 6 (b). Thus, it was formed into a predetermined design size and shape to obtain the performance as a blower. c 'is the wing c
, C ″ indicates the blade pressure surface side, d indicates the blade leading edge of blade c, and e indicates the blade trailing edge.

[0003]

However, in the above-mentioned structure, as shown in FIG. 7, when air flows from the leading edge d to the trailing edge e of the blade a with the rotation of the blade c of the impeller a. In addition, pressure fluctuations occurring after the turbulent flow transition point f when the flow transitions from laminar flow to turbulent flow on the blade pressure surface side c ″ of the blade c, and the discharge of the wake vortex g from the blade trailing edge e. The pressure wave generated by the fluctuation of the lift of the blade c and the discharge of the wake vortex g propagates to the boundary layer fluctuation start point h on the upstream side of the blade, and the blade moves after the boundary layer fluctuation start point h on the blade suction side c ′. Variation of surface boundary layer i
Because of the high level of pressure pulsation caused by the generation of turbulence, turbulent noise having a broadband spectrum has been generated on the impeller blade surface.

The present invention suppresses the occurrence of various pressure fluctuations and pressure waves on the impeller blade surface, which occur in the conventional example, and generates the pressure waves from the impeller blade surface without deteriorating the performance of the blower. An object of the present invention is to provide a fan impeller for reducing the turbulent noise.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned drawbacks in the conventional example, the present invention provides a blower impeller having a hollow layer inside a plurality of blades, , At least a part of the blade pressure surface side or the blade suction surface side,
A porous pressure fluctuation cushioning member having a number of small holes or continuous pores in which the hollow layer communicates with the outside is used.

Further, the present invention uses a porous pressure fluctuation cushioning member having a large number of small holes or continuous pores in which the hollow layer communicates with the outside at least at a part of the leading edge side or the trailing edge side of the blade. doing.

Further, according to the present invention, a hollow layer is provided inside a plurality of blades constituting a fan impeller, and a short pipe communicating between the hollow layer and the outside is provided on the trailing edge side of the blade to receive only static pressure. It has a resonance type silencer.

Further, according to the present invention, a hollow layer is provided inside a plurality of blades constituting a fan impeller, and the entire surface of the blades or
At least a part of the blade pressure surface side or the blade suction surface side is provided with a resonance type silencer provided with a short pipe in which the hollow layer communicates with the outside and is inclined in the fluid flow direction so as to receive only static pressure. I have.

[0009]

According to the above construction, the blower impeller of the present invention is provided with a hollow layer inside the blade of the impeller, and the hollow layer is provided on the front surface of the blade or at least a part on the pressure side or the suction side. When the air flows from the leading edge of the impeller to the trailing edge of the impeller, the air pressure is reduced to the side of the impeller or the impeller. The noise generated on the negative pressure side is absorbed by the porous pressure fluctuation reducing member, and the hollow layer inside the blade has a resonance type silencer structure to reduce noise.

When porous pressure fluctuation reducing members are used on both the pressure surface side and the suction surface side, air flows in and out between the blade pressure surface and the blade suction surface on the blade surface. When the pressure fluctuation on the wing surface becomes high, air flows from the wing surface with high pressure to the wing surface with low pressure, and as a result, the air is suppressed and the noise generated from on the wing surface is reduced. Further, since a part of the air flows out from the blade pressure surface side to the blade suction surface side, there is an effect that the flow of the flow from the blade suction surface is suppressed and the generation of the pressure wave accompanying the peeling is reduced. In addition, a hollow layer is provided inside the blade of the impeller, and at least a part of the leading edge side or the trailing edge side of the blade has pores or continuous pores communicating with the hollow layer and the outside, which alleviates porous pressure fluctuation. Due to the use of the components, the noise generated by the collision of air at the leading edge of the blade when air flows from the leading edge to the trailing edge of the impeller, The noise generated by the wake is absorbed, and the hollow layer inside the wing has a resonance-type silencer structure to reduce noise.

In addition, a hollow layer is provided inside the blade of the impeller,
Suppressing the noise generated by the wake at the trailing edge of the wing by using a resonance type silencer that has a short pipe on the trailing edge side of the wing and that communicates the outside with the hollow layer to receive only static pressure Plan.

Further, a hollow layer is provided inside the blade of the impeller,
A resonance type silencer in which the hollow layer and the outside communicate with the entire surface of the wing, or at least a part of the pressure side or the suction side, and a short pipe inclined in the fluid flow direction so as to receive only static pressure is provided. With this structure, when air flows from the leading edge of the impeller to the trailing edge of the blade, noise generated on the pressure side or the negative pressure side of the blade can be suppressed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. Fig. 1 (a) is a perspective view of a fan impeller, and Fig. 1 (b).
FIG. 2 is a sectional view of the blade of the impeller, and FIG. 2 is a diagram showing a use state of the impeller. In these figures, reference numeral 1 denotes a blower impeller. The blower impeller 1 is rotatably attached to the electric motor 3 by an impeller boss portion 2 and comes to a predetermined position with respect to the opening of the air guider 4. The motor 3 is mounted on the motor support 5 and fixed. When the electric motor 3 is driven to rotate the impeller 1 in a predetermined rotation direction, air is sucked in from A in FIG. 2 and blown out in the direction of B to function as a blower.

As shown in FIGS. 1A and 1B, a blower impeller 1
The wing 7 is attached to the outer peripheral portion of the hub 6 having a truncated cone shape. A hollow layer 8 having a streamlined cross section is formed inside the blade 7, and a main part of the blade pressure surface side 7a and the blade suction surface side 7b of the blade 7 is made of a porous member, for example, a number of small holes. ,
Alternatively, the pressure change buffer member 9 is made of a porous metal or resin in a continuous pore state. In addition, the pressure fluctuation buffering member 9 is such that the hollow layer 8 inside the blade 7 is
Alternatively, it is attached so as to communicate with the blade suction side 7b.

When the impeller 1 rotates with the above configuration, air flows from the leading edge 7c of the impeller 1 along the blade pressure surface side 7a and the blade suction surface 7b, and flows from the blade trailing edge 7d. It is blown out in a predetermined direction. At this time, the blade pressure surface side 7a
Alternatively, the noise generated on the blade negative pressure surface side 7b is absorbed by the porous pressure fluctuation buffer member 9, and the hollow layer 8 inside the blade acts as a resonance type silencer to muffle the noise. Further, if porous members 9 are used on both surfaces of the blade pressure surface side 7a and the blade suction surface side 7b, the blade pressure surface side 7
a and the outflow and inflow of air between the blade suction side 7b, when the pressure fluctuation on one of the blade surfaces becomes high, the air flows from the high pressure blade surface to the low pressure blade surface. The noise that flows out and is consequently suppressed is reduced. Further, since a part of the air flows out from the blade pressure surface side 7a to the blade suction surface side 7b, there is also an effect of suppressing the separation of the flow from the blade suction surface, thereby reducing the generation of pressure waves accompanying the separation. There is action.

In the above embodiment, the blade pressure surface side 7 of the blade 7 is used.
Although the main part of the blade a and the blade suction surface side 7b is made of the porous member 9, the blade pressure surface side 7a or a part of the blade suction surface 7b may be made of the porous member 9.

Next, a second embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. The same members as those in the first embodiment are denoted by the same reference numerals. FIG. 3A is a perspective view of a blower impeller, and FIG. 3B is a cross-sectional view of the blade of the impeller.

As shown in FIGS. 3 (a) and 3 (b), the impeller 1 has a wing 7 attached to an outer peripheral portion of a hub 6 having a truncated cone shape. The porous pressure fluctuation buffer member 9 using a large number of small holes forming a part of the blade 7 or a porous metal or resin in a continuous pore state has a blade leading edge 7c and a blade trailing edge 7c.
d, and the hollow layer 8 inside the wing communicates with the outside by a pressure fluctuation buffering member 9 at the wing leading edge 7c or the wing trailing edge 7d.

In this second embodiment, too, the blower impeller 1 is rotatably mounted on the electric motor 3 and the air guider 4
The motor 3 is installed at a predetermined position with respect to the opening, and the motor 3 is attached and fixed to the motor support 5. When the blower impeller 1 is driven by the electric motor 3 in a predetermined rotation direction, air is sucked in from A in FIG. 2 and is blown out in the direction of B to operate as a blower.

When the impeller 1 rotates as described above, air flows from the blade leading edge 7c of the impeller 1 along the blade pressure side 7a and the blade suction side 7b, and flows from the blade trailing edge 7d. It is blown out in a predetermined direction. At this time, since the porous pressure fluctuation buffering member 9 is used for the wing leading edge 7c or the trailing edge 7d, air flows from the wing leading edge 7c of the impeller 1 to the wing trailing edge 7c.
d, the noise generated by the collision at the wing leading edge 7c and the noise generated by the wake at the wing trailing edge 7d are absorbed, and the hollow layer 8 inside the wing is a resonance type silencer. The structure is designed to muffle sound.

In the above embodiment, the porous pressure fluctuation buffering member 9 is attached to the wing leading edge 7c and the wing trailing edge 7d. 7c or a part of the wing trailing edge 7d.

A third embodiment of the present invention will be described with reference to FIGS. The same members as those in the first embodiment are denoted by the same reference numerals. FIG. 4A is a perspective view of a blower impeller, and FIG. 4B is a cross-sectional view of the blade of the impeller. Fig. 4 (a)
As shown in (b), the impeller 1 of the blower has a wing 7 attached to an outer peripheral portion of a hub 6 having a truncated cone shape, and a short pipe 10 communicating with a hollow layer 8 inside the wing is formed at a trailing edge 7d of the wing. The opening 11 is provided in the wing trailing edge 7d to form a resonance type silencer.

In the third embodiment, too, the impeller 1 is rotatably mounted on the electric motor 3 by the impeller boss 2 and is installed at a predetermined position with respect to the opening of the air guider 4. It is attached and fixed to the support base 5. When the impeller 1 is driven in a predetermined rotation direction by the electric motor 3, air is sucked from A in FIG. 2 and discharged in the direction of B to operate as a blower.

When the impeller 1 rotates as described above, air flows from the blade leading edge 7c of the impeller 1 along the blade pressure side 7a and the blade suction side 7b, and from the blade trailing edge 7d. It is blown out in a predetermined direction. At this time, the noise generated by the wake at the wing trailing edge 7d is provided by providing a structure of a resonance type silencer in which a large number of short tubes 10 penetrating the wing trailing edge 7d are provided so as to receive only static pressure. To mute the sound.

A fourth embodiment of the present invention will be described with reference to FIGS. The same members as those in the first embodiment are denoted by the same reference numerals. FIG. 5A is a perspective view of a blower impeller, and FIG. 5B is a cross-sectional view of the blade of the impeller.

As shown in FIGS. 5 (a) and 5 (b), the blower impeller 1 has blades 7 mounted on the outer peripheral portion of a truncated conical hub portion 6, and the blades 7 have a blade pressure surface side 7a and a blade suction surface. A plurality of short pipes 10 are formed to be inclined in the flow direction so that only the static pressure is applied to the side 7b, and an opening 11 is provided in communication with the hollow layer 8 inside the blade to form a resonance type silencer.

In the fourth embodiment, too, the impeller 1 is rotatably mounted on the electric motor 3 and is installed so as to be at a predetermined position with respect to the air guider 4, and the electric motor 3 is mounted and fixed on the electric motor support base 5. ing. When the impeller 1 is driven in a predetermined rotation direction by the electric motor 3, air is sucked in from A in FIG. 2 and is blown out in the direction of B to operate as a blower. When the impeller 1 rotates, air flows from the blade leading edge 7c of the impeller 1 along the blade pressure surface side 7a and the blade suction surface 7b of the blade 7, and flows from the blade trailing edge 7d to a predetermined position. It is blown out in the direction of.

A number of short tubes 10 are provided to penetrate the entire surface or a part of the blade pressure surface side 7a or the blade suction surface side 7b of the blade 7,
By taking the structure of a resonance type silencer in which the short pipe 10 is inclined in the flow direction so as to receive only the static pressure, the air is impeller 1
The noise generated on the blade pressure surface side 7a or the blade suction surface side 7b of the blade 7 when flowing from the blade front edge portion 7c to the blade rear edge portion 7d can be reduced.

In the above embodiment, a plurality of short tubes 10 are formed on the blade pressure surface side 7a and the blade suction surface side 7b so as to be inclined in the flow direction. 7a
Alternatively, it may be formed on any part of the blade suction side 7b.

[0030]

According to the present invention, a hollow layer is provided inside a blade of a blower impeller, and a large number of small holes or continuous holes communicating the hollow layer with the outside at the front surface of the blade or at least a part of the pressure surface side or the blade suction surface side. Noise generated on the blade pressure surface side or blade suction surface side when air flows from the blade leading edge and the blade trailing edge of the impeller due to the use of the pores and the porous pressure fluctuation buffer member The porous member absorbs sound, and the hollow layer inside the wing has a resonance type silencer structure to muffle the sound.

When porous pressure fluctuation buffer members are used on both the blade pressure surface side and the blade suction surface side, air flows in and out between the blade pressure surface and the blade suction surface on the blade surface. When the pressure fluctuation on one of the wing surfaces becomes high, air flows out onto the wing surface with the other low pressure, and as a result, the air is suppressed and the noise generated on the wing surface is reduced. Furthermore, because some air flows out from the blade pressure surface to the blade suction surface side,
There is also an effect of suppressing the separation of the flow from the blade negative pressure surface, and the generation of a pressure wave due to the separation can be reduced.

Further, a hollow layer is provided inside the blade of the blower impeller, and a porous member having a number of small holes or continuous pores at least at a part of a leading edge side or a trailing edge side of the blade which allows the hollow layer to communicate with the outside. As the air flows from the leading edge of the impeller to the trailing edge of the impeller, the noise generated by the collision at the leading edge of the blade and the wake at the trailing edge of the blade And the hollow layer inside the wing can be silenced by the structure of a resonance type silencer.

Also, a hollow layer is provided inside the impeller wing,
Generated by the wake at the trailing edge of the wing by using a resonance type silencer structure that has a large number of short tubes on the trailing edge side of the wing and that communicates with the outside, and that receives only static pressure Noise can be reduced.

Also, a hollow layer is provided inside the blade of the impeller,
A structure of a resonance type silencer in which a hollow layer and the outside communicate with the entire surface of the blade or at least a part on the pressure surface side or the blade suction surface side, and a short pipe is provided which is inclined in a fluid flow direction so as to receive only static pressure. By taking the air from the leading edge of the impeller,
Noise generated on the pressure surface side or the suction side of the blade when flowing to the blade trailing edge can be reduced.

[Brief description of the drawings]

FIG. 1A is a perspective view of a blower impeller according to a first embodiment of the present invention, and FIG. 1B is a cross-sectional view of the blade of the impeller.

FIG. 2 is a sectional view of a blower using an impeller.

FIG. 3 (a) is a perspective view of a blower impeller according to a second embodiment of the present invention, and FIG. 3 (b) is a sectional view of the blade of the impeller.

FIG. 4A is a perspective view of a blower impeller according to a third embodiment of the present invention, and FIG. 4B is a cross-sectional view of the blade of the impeller.

FIG. 5A is a perspective view of a blower impeller according to a fourth embodiment of the present invention, and FIG. 5B is a cross-sectional view of the blade of the impeller.

FIG. 6A is a perspective view of a conventional fan impeller, and FIG. 6B is a sectional view of the blade.

FIG. 7 is a schematic view of the principle of pressure and noise generation on the blade surface of a conventional blower impeller.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 blower impeller 2 impeller boss 3 motor 4 air guider 5 motor support 6 hub 7 blade 7 a blade pressure surface side 7 b blade suction surface 7 c blade front edge 7 d blade rear edge 8 hollow layer 9 pressure fluctuation buffer member 10 Short pipe 11 Opening

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-12199 (JP, A) JP-A-58-45029 (JP, A) JP-A-1-203698 (JP, A) Japanese Utility Model Showa 50- 125109 (JP, U) Japanese Utility Model Showa 64-53843 (JP, U) Japanese Utility Model Utility Model No. 2-34797 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24F 1/00 316 F03D 1/06 F04D 29/38

Claims (4)

(57) [Claims] 1. A hollow layer is provided inside a plurality of blades constituting a fan impeller, and the hollow layer and the outside communicate with the entire surface of the blade or at least a part of the blade pressure surface side or the blade suction surface side. A blower impeller using a porous pressure fluctuation buffer member having a large number of small holes or continuous pores. 2. A porous pressure fluctuation cushioning member having a number of small holes or continuous pores communicating between the hollow layer and the outside is used at least on a part of the blade at the leading edge side or the trailing edge side. Blower impeller as described. 3. A resonance type silencer which receives only a static pressure by providing a hollow layer inside a plurality of blades constituting a fan impeller, and providing a short pipe communicating between the hollow layer and the outside at a trailing edge side of the blade. Blower impeller equipped with. 4. A hollow layer is provided inside a plurality of blades constituting a fan impeller, and the hollow layer and the outside communicate with the entire surface of the blade or at least a part of the blade pressure surface side or the blade suction surface side. A blower impeller provided with a resonance type silencer provided with a short pipe inclined in a fluid flow direction so as to receive only static pressure.