JP2007198336A - Impeller of fan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an impeller of a fan wherein weight-reduction and the productivity are improved, while the gas-volume performance and noise-reduction are preserved. <P>SOLUTION: The impeller comprises a hub part (not shown) which is rotatably driven by receiving torque from the outside, and a plurality of airfoil blades 4 placed radially extendedly around the hub part. In order to ensure the form of the leading-edge of the each blade 4, at the time of reducing the thickness of the thick-wall part 17 in the blade 4, a mold core (not shown) for a reduced-thickness part 13 is slid linearly to mold the reduced-thickness part 13. The form of the thick airfoil leading-edge of the blade 4 is ensured. Consequently, the gas-volume performance is improved, and the noise-reduction is attained. Further, by reducing the thickness of the thick-wall part 17 in the leading edge 5, production in the thin-wall molding-method can be attained, and the production is stably performed. Since the thin-walled blade can be molded all over the blade area, the weight of the single blade 4 can be reduced. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a blower impeller used for a blower or the like.

  A conventional blower impeller will be described with reference to FIGS. 12 is a perspective view of a conventional blower impeller, FIG. 13 is a plan view of the blades of the blower impeller, FIG. 14 is a cross-sectional view taken along the line AA in FIG. 13, and FIG. It is sectional drawing.

  A conventional blower impeller 2 includes a substantially cylindrical hub portion 3 and blades 4 formed integrally with the hub portion 3, and a predetermined edge 1 is thinly provided on the suction surface side of the blade 4. . A motor shaft (not shown) of a motor (not shown) is fixed to the hub portion 3 of the blower impeller 2, and the motor shaft (not shown) is placed in an appropriate casing (not shown) and blown by rotating in the direction of the arrow by the motor. Produces an effect. At this time, air enters from the front edge 5 of the blower impeller 2 and flows out from the rear edge 6.

Further, since the tapered portions 7 and 8 are provided in the three sides of the suction face 1 on the suction surface side, the shape of the edge 1 is smooth, which promotes characteristic peeling on the suction surface side of the blower impeller 2. As a result, there is very little increase in noise. Therefore, the low noise effect of the thick wing shape can be maintained as it is (see, for example, Patent Document 1).
JP-A-7-189985

  The effect of the agitation of the blower impeller according to the prior art can be useful for weight reduction. However, with the configuration of the conventional blower impeller, the low noise effect and the effect of improving the air flow performance of the thick-walled impeller are reduced. In other words, in the case of putting the eggplant on the suction surface side, there is a problem that it causes some separation, which causes turbulence and leads to deterioration of the air flow performance, and also causes a slight increase in noise due to turbulence noise. there were. Furthermore, since this technique alone has a large thickness of the tip portion (outer peripheral portion) of the blower impeller, there is a problem that productivity (resin molding) is deteriorated.

  The present invention solves the above-described conventional problems, and an object of the present invention is to provide a blower impeller that achieves weight reduction and productivity improvement while maintaining air volume performance and low noise.

  In order to solve the above-described conventional problems, a blower impeller according to the present invention includes a hub portion that is rotationally driven by receiving a rotational force from the outside, and a plurality of wing-shaped radii extending radially around the hub portion. In order to secure the leading edge shape of the blade, in order to steal the thick part of the blade, the mold stealing part is formed by sliding the mold core of the meat stealing part in a linear direction. Therefore, it is possible to secure the leading edge shape of the thick airfoil of the blade, improve air flow performance and reduce noise, and thin the wall by stealing the thick part of the leading edge. It becomes possible to produce by the method, and stable production becomes possible. Further, since the thin blade can be formed over almost the entire area of the blade, the weight of the blade can be reduced.

The blower impeller of the present invention includes a hub portion that is rotationally driven by receiving a rotational force from the outside, and a plurality of wing-like blades radially extending around the hub portion. In stealing the thick part of the blade to ensure the leading edge shape, the mold stealing part is formed by sliding the mold core of the meat stealing part in the same direction as the rotation direction of the blade, The stealing of meat is possible in a large area, and the leading edge shape can be secured in a larger area.

  The blower impeller of the present invention can secure the front edge shape of the thick airfoil of the blade, thereby suppressing the separation of the front edge, so that it is possible to ensure the improvement in air flow performance and low noise, Moreover, by stealing the thick part of the leading edge, it is possible to produce with a thin molding method, and stable production is possible. In addition, since the thin blade is formed over almost the entire area of the blade, the weight of the blade itself can be reduced.

  1st invention consists of the hub part which receives rotational force from the outside, and is rotationally driven, and the several blade | wing blade extended radially around the said hub part, The front edge shape of the said blade | wing is made. To secure the thick part of the blade for securing, the mold stealing part is formed by sliding the mold core of the meat stealing part in a linear direction, and the leading edge shape of the thick airfoil of the blade As a result, it is possible to improve the air flow performance and reduce noise, and by stealing the thick part of the leading edge, it is possible to produce with a thin molding method, and stable production is possible. Become. Further, since the thin blade can be formed over almost the entire area of the blade, the weight of the blade can be reduced.

  A second invention comprises a hub portion that is rotationally driven by receiving a rotational force from the outside, and a plurality of wing-shaped blades radially extending around the hub portion, and the leading edge shape of the blade is In order to secure the thick part of the blade for securing, the mold core is formed by sliding the mold core of the meat stealing part in the same direction as the direction of rotation of the blade. Stealing is possible, and a leading edge shape can be secured in a larger area.

  In the third invention, in particular, in the mold core of the meat stealing portion of the first or second invention, the portion for forming the tip portion of the blade is in the outer peripheral direction, and the portion for forming the blade portion of the blade is in the inner periphery. Inclined in each direction, the mold core can be easily slid and productivity is improved.

  In particular, the fourth aspect of the present invention is the one in which the blade shape of any one of the first to third aspects is gradually changed to smoothly connect the trailing edge shape, and the trailing edge peeling is surely suppressed. As a result, the air flow performance can be improved.

  In the fifth aspect of the invention, in particular, there is provided a hole that communicates the cavity portion of the blade of any one of the first to fourth aspects and the surface of the blade, and water is accumulated in the cavity portion. Since it can prevent, the imbalance of the fan impeller by the freezing of the water etc. can be prevented.

  In the sixth invention, in particular, the opening of the hole of the fifth invention is inclined in the leeward direction so as not to receive dynamic pressure, and generation of sound from the hole can be prevented.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
1 is a perspective view of a blower impeller according to the first embodiment of the present invention, FIG. 2 is a plan view of the blades of the blower impeller, FIG. 3 is a cross-sectional view taken along a line CC in FIG. These are DD sectional drawings of FIG.

1 to 4, the blower impeller 2 includes a hub portion 3 on a substantially circular cylinder or a truncated cone, and blades 4 integrally and radially extending around the hub portion 3. A meat stealing portion 13 is provided at the front edge 5 of the blower impeller 2. As shown in FIG. 3, the surface shape through which the air of the leading edge 5 flows is ensured, and a cavity portion 9 for securing the meat stealing portion 13 is formed. There is a step 10 in the linear direction on the tip portion 14 and the wing portion 15 of the blade 4 so that the mold core slides linearly so that the hollow portion 9 is formed.

  By adopting such a shape, the leading edge shape of the thick-walled airfoil is ensured, leading edge peeling can be suppressed, and air flow performance improvement and noise reduction can be ensured. Further, by providing the meat stealing portion 13 in the thick portion of the front edge 5, it is possible to produce with a thin molding method, and stable production is possible. Further, since the blade 4 is formed with a thin wall over almost the entire area, the weight of the blade 4 itself can be reduced.

(Embodiment 2)
FIG. 5 is a plan view of a blower impeller in the second embodiment of the present invention. In addition, about the same part as the fan impeller in the said 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the present embodiment, the die core (not shown) is slid in the same rotation direction as that of the blower impeller 2 to form the cavity portion 9 so that the tip portion 14 and the wing portion of the blade 4 are formed. 15 is provided with a step 10 in the rotation direction (on the concentric circle of the axis).

  As described above, according to the present embodiment, it is possible to steal meat in a large area, and it is possible to secure a leading edge shape in a larger area.

(Embodiment 3)
FIG. 6 is a partial cross-sectional view (cross-sectional view taken along the line DD of FIG. 2) of the blower impeller in the third embodiment of the present invention. In addition, about the same part as the fan impeller in the said 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In this embodiment, when the thick portion is stealed in order to secure the leading edge shape of the blade 4, a portion of the die core (not shown) of the meat stealing portion 13 that forms the tip portion 14 of the blade 4. Is provided with a taper 11 in the outer peripheral direction, and a portion forming the wing portion 15 is provided in the inner peripheral direction. This facilitates the sliding of the mold core and improves the productivity of the blower impeller 2.

(Embodiment 4)
FIG. 7 is a partial cross-sectional view (cross-section CC of FIG. 2) of the blower impeller in the fourth embodiment of the present invention, and FIG. 8 is a perspective view of the blower impeller. In addition, about the same part as the fan impeller in the said embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the present embodiment, in order to secure the leading edge shape of the blades 4, when the thick portion 17 is stealed, the shape of the stealed meat is gradually changed so as to be smoothly connected to the trailing edge 6. By adopting such a shape, it is possible to improve the performance by suppressing the peeling that occurs from the vicinity of the trailing edge 6.

(Embodiment 5)
FIG. 9 is a plan view of a blower impeller according to the fifth embodiment of the present invention, and FIG. 10 is a sectional view taken along line FF in FIG. In addition, about the same part as the fan impeller in the said embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

In this embodiment, as shown in FIGS. 9 and 10, when the thick portion 17 is stealed in order to secure the leading edge shape of the blade 4, the meat stealed hollow portion 9 and the blade surface 4 a are communicated with each other. A hole 12 is formed. Since the holes 12 can prevent water from collecting in the hollow portion 9, unbalance of the blower impeller 2 due to freezing of the water or the like can be prevented.

(Embodiment 6)
FIG. 11: is sectional drawing (FF cross section of FIG. 9) of the blade | wing of the fan impeller in the 6th Embodiment of this invention. In addition, about the same part as the fan impeller in the said embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the present embodiment, in order to secure the leading edge shape of the blade 4, the thick portion 17 is stealed so that the hole 12 for communicating the stealed cavity 9 and the blade surface 4 a is not subjected to dynamic pressure. The opening is provided so as to incline in the leeward direction, so that it is possible to prevent the generation of cavity noise caused by an air flow colliding with the edge tip of the hole 12.

  As described above, the blower impeller according to the present invention can achieve weight reduction and productivity improvement while maintaining a thick blade type blade shape with low noise and excellent air volume performance. It can be applied to other uses.

The perspective view of the fan impeller in Embodiment 1 of this invention Top view of the blades of the blower impeller CC sectional view of FIG. DD sectional view of FIG. The top view of the fan impeller in Embodiment 2 of this invention Partial sectional view of a blower impeller in Embodiment 3 of the present invention Partial sectional view of a blower impeller in Embodiment 4 of the present invention Perspective view of the blower impeller The top view of the fan impeller in Embodiment 5 of this invention FF sectional view of FIG. Sectional drawing of the blade | wing of the fan impeller in Embodiment 6 of this invention A perspective view of a conventional blower impeller Top view of the blades of the blower impeller AA sectional view of FIG. BB sectional view of FIG.

Explanation of symbols

2 impeller 3 hub portion 4 blade 5 leading edge 6 trailing edge 9 hollow portion 12 hole 13 meat stealing portion 17 thick portion

Claims (6)

A hub portion that is rotationally driven by receiving a rotational force from the outside, and a plurality of wing-shaped blades radially extending around the hub portion, and in order to ensure the leading edge shape of the blade, A blower impeller characterized in that when stealing a thick portion, the die core is formed by sliding a mold core of the meat stealing portion in a linear direction. A hub portion that is rotationally driven by receiving a rotational force from the outside, and a plurality of wing-shaped blades radially extending around the hub portion, and in order to ensure the leading edge shape of the blade, A fan impeller characterized in that when the thick portion is stealed, the die stealing portion is formed by sliding the mold core of the meat stealing portion in the same direction as the rotation direction of the blade. The portion of the mold core of the meat stealing portion is inclined in the outer peripheral direction, and the portion of the blade forming the wing portion is inclined in the inner peripheral direction, respectively. The blower impeller described in 2. The blower impeller according to any one of claims 1 to 3, wherein the surface shape of the blade stealing the meat is gradually changed and smoothly connected to the trailing edge shape. The blower impeller according to any one of claims 1 to 4, wherein a hole is provided to communicate the cavity portion where the blade is stealed and the surface of the blade. The blower impeller according to claim 5, wherein the opening of the hole is inclined in the leeward direction so as not to receive dynamic pressure.

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