JP2011074763A - Impeller and blower having the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an impeller having superior silentness and rigidity and enabling the weight to be reduced, and also provide a blower having the impeller. <P>SOLUTION: This impeller 29 includes a metal impeller body 15 which is provided around a rotating shaft 11 and comprises a plurality of blades 13, and resin leading edge covering parts 19a which cover the surfaces of the blades 13 along the leading edges 13a of the blades 13 which are the forward edges in the rotating direction. The impeller 29 is of a propeller type in which the plurality of blades 13 extend radially outward from the rotating shaft 11. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an impeller and a blower provided with the impeller.

  Conventionally, blowers such as turbofans and propeller fans have been used for various purposes. These blowers include an electric motor as a power generation source and an impeller that is attached to a drive shaft of the electric motor and rotates. This impeller includes a plurality of blades provided around the rotation shaft.

  For example, an impeller of a turbofan disclosed in Patent Document 1 includes an aluminum hub and a shroud, and a plurality of resin blades (blades) arranged between them in a circumferential direction. have. An impeller disclosed in Patent Document 2 includes a metal disk, a plurality of metal spider parts attached to the disk, and a resin blade (blade) integrally formed with each spider part. have.

  Usually, since the impeller receives a large force due to centrifugal force, air resistance, and the like during high-speed rotation, the impeller is required to have rigidity capable of withstanding the force. Further, as disclosed in Patent Documents 1 and 2, each blade of the impeller is usually formed into a shape (so-called aerofoil shape) in which the thickness on the front edge side is thick and the thickness on the rear edge side is thin. ing. It is known that the aerodynamic characteristics are improved by having each blade have such a shape, so that the quietness during the rotation of the impeller is improved.

JP-A-6-307390 JP 2002-242886 A

  When each blade is formed of resin as in Patent Documents 1 and 2, there is an advantage that even a complicated three-dimensional shape such as an airfoil shape can be easily formed. On the other hand, in order to provide the required rigidity, it is necessary to increase dimensions such as the thickness of each blade, for example. Therefore, in the impellers of Patent Documents 1 and 2, it is difficult to reduce the weight while maintaining the required rigidity.

  Then, this invention is made | formed in view of this point, The place made into the objective is providing the impeller which is excellent in silence and rigidity, and can be reduced in weight, and a blower provided with the same. is there.

  The impeller of the present invention includes a metal impeller body (15) including a plurality of blades (13) provided around the rotation shaft (11), and an edge on the front side in the rotational direction of each blade (13). A resin-made front edge covering portion (19a) covering the surface of the blade (13) along a certain front edge (13a).

  In this configuration, since the impeller body (15) including the plurality of blades (13) is made of metal, rigidity can be imparted to the entire blade (13) without increasing the thickness of the blade (13). it can. Therefore, compared with the case where the plurality of blades (13) are formed of resin, the blades (13) can be significantly thinned, and as a result, the impeller can be reduced in weight. Become. And since it has the resin front edge coating | coated part (19a) which coat | covers the surface of a blade | wing (13) along the front edge (13a) of a blade | wing (13), the aerodynamic characteristic of an impeller improves. Noise during rotation of the impeller can be reduced. That is, in this configuration, the overall rigidity of each blade (13) is obtained by making the impeller body (15) made of metal, while the quietness during rotation is achieved by the resin front edge covering portion (19a). It is obtained by providing. Therefore, the impeller of this configuration is excellent in quietness and rigidity and can be reduced in weight.

  Moreover, when the said several blade | wing (13) is a plate-shaped object shape | molded by processing a sheet metal, a blade | wing (13) can be shape | molded easily at low cost. On the other hand, since it is difficult to thicken a part of the blade (13) in the sheet metal processing, the blade (13) becomes a thin plate shape including the front edge (13a), and the aerodynamic characteristics are not necessarily limited. Not a high shape. Even in the case where the blade is formed by sheet metal processing in this way, the surface of the blade (13) is covered with the front edge covering portion made of resin along the front edge (13a) of the blade (13) as in this configuration. The aerodynamic characteristics of the blades can be improved by covering with (19a). Therefore, according to this configuration, both quietness and low cost can be achieved.

  The propeller-shaped impeller in which the plurality of blades (13) extend radially outwardly about the rotating shaft (11) tends to be inferior in terms of noise reduction compared to other types of impellers. Therefore, the present invention is particularly effective for a propeller type impeller.

  The propeller-shaped impeller body (15) may be a plate-like body formed by processing a sheet metal. In this case, of the surface of the impeller body (15), a central region on the radially inner side where the plurality of blades (13) are connected to each other has a resin-made central covering portion (19b) covering the central region. ) Is preferably provided.

  In this configuration, the impeller body (15) including the plurality of blades (13) can be easily formed at low cost by sheet metal processing, but it is difficult to thicken part of the blades (13) by sheet metal processing. It is. Therefore, the impeller body (15) is plate-shaped throughout. Further, in the case of the propeller-shaped impeller, a large load is likely to be applied to the proximal end portion of each blade (13) during rotation. In particular, in the case of the impeller body (15) formed into a plate shape by sheet metal processing as in this configuration, a large load is likely to be applied to the radially inner central region where the plurality of blades (13) are connected to each other. . Therefore, the rigidity of the impeller can be further improved by covering the surface of the central region of the surface of the impeller body (15) with the resin-made central covering portion (19b) as in this configuration. Can do.

  Further, the propeller-shaped impeller body (15) is provided with a through-hole (23) into which the drive shaft (33) of the electric motor (31) can be inserted at a position where the rotation shaft (11) passes. The center cover portion (19b) has a shaft hole (25) at a position where the rotation shaft (11) passes, and a shaft (25) through which the drive shaft (33) of the electric motor (31) can be inserted. You may have the boss | hub part (27) which is provided and whose thickness of an axial direction is larger than a surrounding site | part.

  In this configuration, since the center covering portion (19b) is made of resin, the boss portion (27) having a large thickness can be easily provided by resin molding. Since the boss portion (27) is thicker in the axial direction than the surrounding portion, the impeller (29) is stable to the drive shaft (33) when the drive shaft (33) of the electric motor (31) is inserted. To be supported.

  The leading edge covering portion (19a) extends along the leading edge (13a) so that the entire thickness including the leading edge covering portion (19a) and the blade (13) increases toward the outer side in the radial direction. The surface of the blade (13) may be covered.

  In the propeller-shaped impeller, the front edge (13a) of the blade (13) becomes larger as the rotational speed is increased outward in the radial direction. Therefore, by providing the front edge covering portion (19a) so that the entire thickness including the front edge covering portion (19a) and the blades (13) increases toward the outer side in the radial direction as in this configuration, the aerodynamic characteristics are improved. It can improve further and can further improve silence.

  Since the blower of the present invention includes the impeller and the electric motor (31) having the drive shaft (33) fixed to the impeller, the weight can be reduced, and the silence and rigidity can be achieved. Are better. Thereby, since it becomes possible to rotate an impeller at high speed rather than before, a big air volume can be obtained.

  As described above, according to the present invention, it is possible to provide an impeller that is excellent in quietness and rigidity and can be reduced in weight.

It is a perspective view which shows the air blower concerning one Embodiment of this invention. It is a perspective view which shows the impeller main body in the impeller of the air blower of FIG. The impeller concerning 1st Embodiment of this invention is shown, (a) is the IIIa-IIIa sectional view taken on the line of FIG. 1, (b) is the IIIb-IIIb sectional view, (c) is IIIc-IIIc 3 is a cross-sectional view taken along a line, (d) is a cross-sectional view taken along the line IIId-IIId in FIG. 1, and (e) is a cross-sectional view taken along the line IIIe-IIIe. The impeller concerning 2nd Embodiment of this invention is shown, (a) is the IIIa-IIIa sectional view taken on the line of FIG. 1, (b) is the IIIb-IIIb sectional view, (c) is IIIc-IIIc It is line sectional drawing. The impeller concerning 3rd Embodiment of this invention is shown, and it is the IIIb-IIIb sectional view taken on the line of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<Blower>
As shown in FIG. 1, a blower 35 according to an embodiment of the present invention includes an electric motor 31 as a drive source and an impeller 29 attached to a drive shaft 33 of the electric motor 31. The impeller 29 has a propeller shape in which two blades 13 extend radially around the rotation shaft 11. The blower 35 is a propeller fan including the propeller-shaped impeller 29.

<First Embodiment>
The impeller 29 according to the first embodiment of the present invention includes a metal impeller body 15 and a resin coating portion 19 that covers a part of the surface of the impeller body 15.

  As shown in FIG. 2, the impeller body 15 is a thin plate-like molded body formed by processing a single sheet metal, and has a substantially uniform thickness throughout. The impeller body 15 has two blades 13 provided around the rotation shaft 11 so as to extend in the radial direction. The impeller body 15 has a through-hole 23 into which the drive shaft 33 of the electric motor 31 can be inserted at a position including the rotation shaft 11.

  The two blades 13 are respectively provided at positions that are rotationally symmetric with respect to the rotational axis 11.

  The covering portion 19 includes a leading edge covering portion 19a and a center covering portion 19b and a trailing edge covering portion 19c. The leading edge covering portion 19a, the center covering portion 19b, and the trailing edge covering portion 19c continuously cover the surface of the impeller body 15, and may be applied to the surface of the impeller body 15 by a method such as injection molding described later. Covered.

  The front edge covering portion 19 a covers the surface of the blade 13 along the front edge 13 a that is the front edge of each blade 13 in the rotational direction. As shown in FIG. 1 and FIGS. 3A to 3D, the front edge covering portion 19 a is formed along the front edge 13 a of each blade 13 of the impeller body 15 with one of the front surface 13 b and the back surface 13 c of each blade 13. Each part is covered with a strip. The front edge covering portion 19a covers a portion of the front surface 13b of each blade 13 on the front edge 13a side in a band shape and is folded back at the front edge 13a, and further covers a portion on the front edge 13a side of the back surface 13c in a band shape. Yes.

  The thickness and width of the front edge covering portion 19a are not particularly limited, and may be appropriately set in consideration of the shape and size of the impeller 29, the rotational speed of the impeller 29 during use, and the like. In the present embodiment, the leading edge covering portion 19a is provided such that the entire thickness including the blade 13 and the leading edge covering portion 19a is substantially the same over the entire radial direction. That is, the thickness t1 (see FIG. 3A) of the radially outer portion of the blade 13, the thickness t2 of the radially intermediate portion of the blade 13 (see FIG. 3B), the radially inner side of the blade 13 The thickness t3 (see FIG. 3C) of the portion and the thickness t4 (see FIG. 3D) of the portion further inside in the radial direction of the blade 13 are set to be approximately the same.

  The width w1 of the radially outer portion of the blade 13 and the width w2 of the radially middle portion are substantially the same, and the radially inner width w3 is such that the width w1, the width w1, so as to be gently connected to the center covering portion 19b. An inner width w4 that is larger than w2 and further in the radial direction is larger than the width w3. A radially inner portion of the leading edge covering portion 19a is continuously connected to the central covering portion 19b.

  As shown in FIG. 1 and FIG. 3E, the center covering portion 19 b covers the center region 21 on the radially inner side where the two blades 13 are connected to each other on the surface 13 b of the impeller body 15. Here, the center region 21 of the impeller body 15 has a predetermined spread in all directions radially outward along the surface 15b of the impeller body 15 from the periphery of the through-hole 23 as shown in FIG. Refers to the area. In the present embodiment, the center region 21 is a substantially circular region around the rotation shaft 11 in the impeller body 15. The center covering portion 19b covers almost the entire center region 21. Similarly, the center covering portion 19b is provided on the back surface 13c at a position facing the center region 21 of the front surface 13b. The thickness of the center covering portion 19b is not particularly limited, and may be set as appropriate in consideration of the shape and size of the impeller 29, the rotation speed during use, and the like. In the present embodiment, the total thickness t5 including the impeller body 15 and the center covering portion 19b is set to be approximately the same as the thicknesses t1 to t4.

  The center covering portion 19b has a boss portion 27 having a larger axial thickness than the surrounding portion at a position including the rotation shaft 11. The boss portion 27 has a shaft hole 25 that communicates with the through hole 23 and into which the drive shaft 33 of the electric motor 31 can be inserted. The boss portion 27 has a plurality of reinforcing ribs 27a along the outer periphery of the base end portion. As shown in FIG. 1, the center covering portion 19 b is continuously connected to a trailing edge covering portion 19 c provided in a strip shape along the rear edge 13 e of the impeller body 15.

  The rear edge covering portion 19 c is provided only at the radially inner portion of the rear edge 13 of the impeller body 15. Since a relatively large load is applied to the radially inner portion of the rear edge 13 of the impeller body 15 when the impeller 29 rotates, such a rear edge covering portion 19c is provided, so that the impeller 29 The rigidity is further enhanced and it is possible to rotate at higher speed.

  Next, a method for manufacturing the impeller 29 will be described. First, the impeller body 15 is formed by processing a sheet metal using a processing method such as pressing. As the material of the impeller body 15, various metals such as aluminum and iron can be used. However, for example, aluminum or an alloy thereof is preferably used because it can be further reduced in weight. As the aluminum alloy, for example, a 1000-7000 series material standardized by Japanese Industrial Standard can be used. Hereinafter, the case where an aluminum alloy is used will be described as an example.

  Next, pretreatment is performed by immersing the impeller body 15 made of the aluminum alloy obtained above in a pretreatment liquid such as a basic aqueous solution or an acidic aqueous solution. Examples of the pretreatment liquid include basic aqueous solutions such as sodium hydroxide, potassium hydroxide and ammonia, and acidic aqueous solutions such as hydrochloric acid, nitric acid and sulfuric acid. This step can be omitted if necessary. After the pretreatment, the impeller body 15 is preferably washed with water.

  Next, the impeller body 15 is immersed in an aqueous solution such as ammonia, hydrazine, or a water-soluble amine compound to form fine irregularities on the surface of the impeller body 15, and a nitrogen-containing compound is adsorbed on the surface. Examples of the water-soluble amine compound include methylamine, dimethylamine, ethylamine, diethylamine, ethylenediamine, ethanolamine, allylamine, and aniline. After performing this process, the impeller body 15 is dried for a predetermined time.

  Next, a portion of the surface of the impeller body 15 that is covered with the front edge covering portion 19a, the center covering portion 19b, and the rear edge covering portion 19c is coated with a thermoplastic resin by a method such as injection molding. Integrate. That is, the thermoplastic resin is injected into the mold in a state where the impeller body 15 is disposed in the mold of the injection molding machine. Thereby, the impeller 29 is obtained.

  As the thermoplastic resin, for example, polyphenylene sulfide (PPS) or a mixture of this PPS and another resin can be used. Examples of other resins include polycarbonate and polyethylene terephthalate. A filler such as a filler may be added to the thermoplastic resin.

  As shown in FIG. 1, the impeller 29 obtained as described above inserts the drive shaft 33 of the electric motor 31 into the through hole 23 and the shaft hole 25, and the tip of the drive shaft 33 protrudes from the boss portion 27. By fitting the stopper 32, it is fixed to the drive shaft 33.

  As described above, in this embodiment, since the impeller body 15 including the plurality of blades 13 is made of metal, rigidity can be imparted to the entire blades 13 without increasing the thickness of the blades 13. . Therefore, compared with the case where the plurality of blades 13 are made of resin, the blades 13 can be significantly thinned, and as a result, the impeller can be reduced in weight. In addition, since the front edge covering portion 19a made of resin that covers the surface of the blade 13 is provided along the front edge 13a of the blade 13, the aerodynamic characteristics of the impeller are improved and noise during rotation of the impeller is reduced. Can be reduced. That is, the portion that needs to be thickened to improve the aerodynamic characteristics (the leading edge portion of the impeller) is made of resin, thereby achieving both weight reduction and noise reduction.

  Moreover, in this embodiment, since the several blade | wing 13 is a plate-shaped object shape | molded by processing a sheet metal, the blade | wing 13 can be shape | molded easily at low cost. And since the surface of the said blade | wing 13 is coat | covered with the resin front edge coating | coated part 19a along the front edge 13a of the blade | wing 13, the aerodynamic characteristic of the blade | wing 13 can be improved. Therefore, according to the present embodiment, both quietness and low cost can be achieved.

  In this embodiment, since the impeller body 15 is a propeller shape and is a plate-like body formed by processing a sheet metal, the impeller body 15 including the plurality of blades 13 can be manufactured at a low cost by sheet metal processing. Easy to mold. Moreover, since the center region 21 on the radially inner side where the plurality of blades 13 are connected to each other on the surface of the impeller body 15 is provided with a resin-made center coating portion 19b that covers the center region 21, the blades The rigidity of the vehicle 29 can be further improved.

  In the present embodiment, the impeller body 15 is provided with a through-hole 23 into which the drive shaft 33 of the electric motor 31 can be inserted at a position where the rotation shaft 11 passes. The center covering portion 19b is provided with a shaft hole 25 that communicates with the through hole 23 and into which the drive shaft 33 of the electric motor 31 can be inserted at a position where the rotary shaft 11 passes, and has an axial thickness that is greater than that of the surrounding portion. May have a large boss portion 27. Since the center covering portion 19b is made of resin, the thick boss portion 27 can be easily provided by resin molding. Since the boss portion 27 is thicker in the axial direction than the surrounding portion, the impeller 29 is stably supported by the drive shaft 33 when the drive shaft 33 of the electric motor 31 is inserted.

Second Embodiment
4A and 4B show an impeller 29 according to the second embodiment of the present invention, in which FIG. 4A is a cross-sectional view taken along line IIIa-IIIa in FIG. 1, and FIG. ) Is a sectional view taken along line IIIc-IIIc. In addition, about the site | part of the same structure as 1st Embodiment, the same code | symbol as 1st Embodiment is attached | subjected and description is abbreviate | omitted.

  The impeller 29 of the second embodiment is different from the first embodiment in that the thickness of the leading edge covering portion 19b that covers the blade 13 differs depending on the location. As shown in FIGS. 4A to 4C, the leading edge covering portion 19a is formed on the leading edge 13a so that the entire thickness including the leading edge covering portion 19a and the blade 13 increases toward the outer side in the radial direction. The surface of the blade 13 is covered along. That is, the thickness t1 of the radially outer portion is larger than the thickness t2 of the radially middle portion, and the thickness t2 is larger than the thickness t3 of the radially inner portion.

  In a propeller-shaped impeller, the leading edge 13a of the blade 13 increases as the rotational speed increases radially outward. Therefore, the aerodynamic characteristics are further improved by providing the leading edge covering portion 19a so that the total thickness including the leading edge covering portion 19a and the blades 13 increases toward the outer side in the radial direction as in the second embodiment. And quietness can be further enhanced.

<Third Embodiment>
FIG. 5 shows an impeller 29 according to a third embodiment of the present invention, and is a cross-sectional view taken along line IIIb-IIIb in FIG. In addition, about the site | part of the same structure as 1st Embodiment, the same code | symbol as 1st Embodiment is attached | subjected and description is abbreviate | omitted.

  The impeller 29 of the third embodiment is different from the first embodiment in that the front edge covering portion 19a is covered only on the surface 13b of the blade 13. Although not shown in FIG. 5, in the third embodiment, the center covering portion 19 b and the trailing edge covering portion 19 c are not covered on the back surface of the impeller body 15, and are covered only on the surface. .

  Further, as shown in FIG. 5, the front edge covering portion 19a is provided such that the thickness on the front edge 13a side is large and the thickness decreases as the front edge 13a moves away. Thereby, the aerodynamic characteristic of the blade | wing 13 improves more.

  As in the third embodiment, depending on the shape and size of the impeller 29, the rotational speed at the time of use, etc., it is only necessary to provide the covering portion 19 only on the front surface or the back surface of the impeller body 15. Thereby, the usage-amount of resin of the coating | coated part 19 can be reduced and cost can be reduced.

<Other embodiments>
The present invention is not limited to the above-described embodiment, and various modifications and improvements can be made without departing from the spirit of the present invention. For example, in the above-described embodiment, the case where the plurality of blades 13 are plate-like bodies formed by processing sheet metal has been described as an example, but the present invention is not limited to this. The blades 13 may be formed using other processing methods such as casting and forging.

  Moreover, although the said embodiment gave and demonstrated the case where the impeller main body 15 was a plate-shaped object integrally processed by processing a sheet metal, it is not limited to this. The impeller body 15 may be formed by separately molding each blade 13. Specifically, for example, a cylindrical hub (not shown) to which the drive shaft 33 of the electric motor 31 is attached is separately formed, and each blade 13 separately formed is welded, bonded, screwed, etc. to the outer peripheral portion of the hub. You may join by the joining means.

  Moreover, although the said embodiment gave and demonstrated the case where injection molding was used as an example as a method of coat | covering the resin-made coating | covering part 19 to the blade | wing 13, it is not limited to this, For example, the coating | coated part 19 is used with an adhesive agent etc. A method of joining to the impeller body 15 can also be used.

  Moreover, in the said embodiment, the case where the rear edge coating | coated part 19c coat | covered along the rear edge of the impeller main body 15 and the center coating | coated part 19b which coat | covers the center area | region 21 of the impeller main body 15 is mentioned as an example. Although described, the center covering portion 19b and the trailing edge covering portion 19c are not essential and may be omitted.

  In the above-described embodiment, the case where the leading edge covering portion 19a, the center covering portion 19b, and the trailing edge covering portion 19c are continuously (integrally) connected has been described as an example, but the present invention is not limited thereto. The front edge covering portion 19a, the center covering portion 19b, and the rear edge covering portion 19c may be covered separately on the respective covering portions.

  In the above embodiment, the case where the center covering portion 19b has the boss portion 27 into which the drive shaft 33 of the electric motor 31 is inserted has been described as an example. However, the present invention is not limited to this. The boss portion 27 is not made of resin as in the above-described embodiment, and may be formed of other materials such as metal. For example, when the boss portion 27 is made of metal, it may be joined to the impeller body 15 by welding or the like.

  In the embodiment, the case where the blower 35 is a propeller fan has been described as an example. However, the present invention can also be applied to other blowers such as a turbo fan and a sirocco fan. For example, in the case of a turbofan, an impeller having a hub portion (not shown) fixed to the drive shaft 33 of the electric motor 31 and a plurality of blades arranged along the circumferential direction of the hub portion is used. . The plurality of blades are formed separately.

DESCRIPTION OF SYMBOLS 11 Rotating shaft 13 Blade 13a Blade front edge 15 Impeller body 19 Cover portion 19a Front edge cover portion 19b Center cover portion 21 Center region 23 Through hole 25 Shaft hole 27 Boss portion 29 Impeller 31 Motor 33 Motor drive shaft 35 Blower

Claims (7)

A metal impeller body (15) including a plurality of blades (13) provided around the rotating shaft (11);
An impeller comprising a resin-made front edge covering portion (19a) covering the surface of the blade (13) along a front edge (13a) which is an edge on the front side in the rotation direction of each blade (13).   The impeller according to claim 1, wherein the plurality of blades (13) are plate-like bodies formed by processing a sheet metal.   The impeller according to claim 1 or 2, wherein the plurality of blades (13) have a propeller shape extending radially outward from the rotation axis (11) as a center. The impeller body (15) is a plate-like body formed by processing a sheet metal,
Of the surface of the impeller body (15), a center region on the inner side in the radial direction where the plurality of blades (13) are connected is provided with a resin center coating portion (19b) covering the center region. The impeller according to claim 3. The impeller body (15) is provided with a through hole (23) into which the drive shaft (33) of the electric motor (31) can be inserted at a position where the rotating shaft (11) passes.
The center cover portion (19b) has a shaft hole (25) at a position where the rotation shaft (11) passes, and a shaft (25) through which the drive shaft (33) of the electric motor (31) can be inserted. The impeller according to claim 4, wherein the impeller is provided with a boss portion (27) having a larger axial thickness than a surrounding portion.   The front edge covering portion (19a) is formed along the front edge (13a) so that the total thickness including the front edge covering portion (19a) and the blade (13) increases toward the outer side in the radial direction. The impeller according to any one of claims 3 to 5, which covers the surface of the blade (13). The impeller (29) according to any one of claims 1 to 6,
And a motor (31) having a drive shaft (33) fixed to the impeller (29).

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