JP2007120445A - Turbo fan - Google Patents

Turbo fan Download PDF

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JP2007120445A
JP2007120445A JP2005315637A JP2005315637A JP2007120445A JP 2007120445 A JP2007120445 A JP 2007120445A JP 2005315637 A JP2005315637 A JP 2005315637A JP 2005315637 A JP2005315637 A JP 2005315637A JP 2007120445 A JP2007120445 A JP 2007120445A
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Japan
Prior art keywords
shroud
fitting portion
fan
blade
concave
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JP5007457B2 (en
Inventor
Atsushi Edayoshi
敦史 枝吉
Hisafumi Ikeda
尚史 池田
Kazutaka Suzuki
一隆 鈴木
Katsumi Shibayama
勝巳 柴山
Hiroshi Nakajima
中島　　浩
Takashi Kawai
孝 河合
Kazushi Hori
収志 堀
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NIPPON KOBUNSHI KK
Mitsubishi Electric Corp
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NIPPON KOBUNSHI KK
Mitsubishi Electric Corp
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Priority to JP2005315637A priority Critical patent/JP5007457B2/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • F04D29/282—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/02—Selection of particular materials
    • F04D29/023—Selection of particular materials especially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/624—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/626—Mounting or removal of fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2230/00—Manufacture
    • F05D2230/20—Manufacture essentially without removing material
    • F05D2230/23—Manufacture essentially without removing material by permanently joining parts together
    • F05D2230/232—Manufacture essentially without removing material by permanently joining parts together by welding
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2230/00—Manufacture
    • F05D2230/50—Building or constructing in particular ways
    • F05D2230/53—Building or constructing in particular ways by integrally manufacturing a component, e.g. by milling from a billet or one piece construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/40—Organic materials
    • F05D2300/43—Synthetic polymers, e.g. plastics; Rubber

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To surely perform welding in assembly, prevent assembly defects and inhibit worsening of noise in connection with a turbo fan molded from thermoplastic resin. <P>SOLUTION: The turbo fan 1 is molded from thermoplastic resin so that a fan body 9, which is integrally molded in a state that a plurality of blades 3 are erectly provided on the periphery of a boss around a main plate 2 having at a central part the boss 2b fixed to a rotary shaft of a motor, and a shroud 4 forming a suction guide wall are fixed into a one body. A concave fitting portion 5, which has at a bottom a flat face 5b perpendicular to the rotary shaft, is formed on a blade tip side of each blade 3. A convex fitting portion 7, which extends parallel to the rotary shaft and has at a bottom a flat face 7b perpendicular to the rotary shaft, is formed at a position of the shroud 4 opposite to each blade 3 of the fan body 9, and at least the concave fitting portions 5 and the convex fitting portions 7 are closely contacted and integrally joined. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、空気調和機に搭載される熱可塑性樹脂にて成形されるターボファンに係り、騒音悪化を抑制しつつ溶着組立性の向上及び強度向上を図ったターボファンに関するものである。   The present invention relates to a turbofan molded from a thermoplastic resin mounted on an air conditioner, and more particularly to a turbofan that improves weld assembly and strength while suppressing noise deterioration.

従来のターボファンは、主板と裏側に開口をもつ袋状の中空構造の複数の翼とが熱可塑性樹脂にて一体成形されたファン本体と、シュラウドとで構成されている。
また、ファン本体のそれぞれの翼には翼先端部から翼中空部に連通する嵌合メス部が形成され、シュラウドの各翼相当位置にはシュラウドよりファン高さ方向に延出する嵌合オス部が形成されている。 A conventional turbofan is composed of a fan body in which a main plate and a plurality of wings having a bag-like hollow structure having openings on the back side are integrally formed of a thermoplastic resin, and a shroud.
Further, each blade of the fan body has a fitting female portion communicating from the blade tip to the blade hollow portion, and a fitting male portion extending from the shroud in the fan height direction at each blade of the shroud. Is formed.

そして、シュラウドの嵌合オス部はファン本体の嵌合メス部に挿入後、シュラウドの表面とファン本体の傾斜面となる翼先端溶着部及びシュラウドの嵌合オス部の側面とファン本体の嵌合メス部の側面が固着されて一体となり、ターボファンが形成されている。
このように形成されたシュラウドとファン本体の両者を固着させる際、シュラウドの嵌合オス部とファン本体の嵌合メス部とにより、容易かつ正確に位置決めが可能なため、製造精度が向上すると共に、生産性を向上させることができる（例えば、特許文献１参照）。
特許第３５０９４５６号公報 Then, after the fitting male part of the shroud is inserted into the fitting female part of the fan main body, the blade tip welded part which becomes the inclined surface of the shroud surface and the fan main body and the side of the male male part of the shroud and the fan main body are fitted A side surface of the female portion is fixed and integrated to form a turbo fan.
When fixing both the shroud and the fan body formed in this manner, the positioning can be easily and accurately performed by the fitting male part of the shroud and the fitting female part of the fan body, thereby improving the manufacturing accuracy. , Productivity can be improved (see, for example, Patent Document 1).
Japanese Patent No. 3509456

従来のターボファンは上述のように構成され、シュラウドとファン本体の固着時の製造精度が向上し、生産性の向上が可能である。
しかし、シュラウドとファン本体との溶着面は、シュラウドの表面とファン本体の傾斜面となる翼先端溶着部及びシュラウドの嵌合オス部の側面とファン本体の嵌合メス部の側面であり、シュラウドとファン本体の組立て溶着時にターボファンの回転軸方向（上下方向）に両者が加圧されるが、ファン本体の翼先端溶着部は翼の回転方向に傾斜設置されているので翼先端溶着部は傾斜面となり、そのために上下方向の力が逃げ、翼に水平方向の力が付加されて溶着力が低下し、均等に溶着されないおそれがある。
また、水平方向の力を吸収するのは、シュラウドの嵌合オス部とファン本体の嵌合メス部の側面のみであるため、シュラウドの嵌合オス部とシュラウドの接続面に応力が集中して破損するおそれがある。 The conventional turbofan is configured as described above, and the manufacturing accuracy at the time of fixing the shroud and the fan body is improved, and the productivity can be improved.
However, the welding surface between the shroud and the fan main body is the surface of the shroud, the blade tip welded portion that becomes the inclined surface of the fan main body, the side surface of the fitting male portion of the shroud, and the side surface of the female fitting portion of the fan main body. When the fan body is assembled and welded, both are pressurized in the direction of the rotation axis (vertical direction) of the turbofan, but the blade tip welded part of the fan body is inclined in the blade rotation direction, so the blade tip welded part is As a result, the vertical force escapes and a horizontal force is applied to the wing, resulting in a decrease in the welding force, which may result in an uneven welding.
Also, since the horizontal force is absorbed only by the side of the mating male part of the shroud and the female fitting part of the fan body, stress is concentrated on the mating male part of the shroud and the connecting surface of the shroud. There is a risk of damage.

本発明は上述のような問題点を解消するためになされたもので、熱可塑性樹脂にて成形されるターボファンに関し、組立て時の溶着を確実に行い、組立て不具合の発生を防止し、騒音の悪化の抑制を図ったターボファンを得ることを目的とする。   The present invention has been made to solve the above-described problems, and relates to a turbofan molded from a thermoplastic resin, which reliably welds at the time of assembly, prevents the occurrence of assembly problems, and reduces noise. The purpose is to obtain a turbofan that suppresses deterioration.

本発明に係るターボファンは、中央部にモータの回転軸に固定されるボスを有する主板の周辺で該ボスの周囲に複数枚の翼を立設した状態で一体成形されたファン本体と、吸込み導風壁を形成するシュラウドとが固着されて一体となるよう熱可塑性樹脂で成形されたターボファンにおいて、各翼の翼先端側に、底部に回転軸と垂直方向の平坦面を有する凹状嵌合部をそれぞれ形成し、かつシュラウドのファン本体の各翼と相対する位置に、回転軸と平行に延出し、底部に回転軸と垂直な平坦面を有する凸状嵌合部をそれぞれ形成し、少なくとも前記凹状嵌合部と前記凸状嵌合部の平坦面が密着して一体に接合されるようにしたものである。   A turbofan according to the present invention includes a fan body integrally formed with a plurality of blades standing on the periphery of a main plate having a boss fixed to a rotating shaft of a motor at a central portion, and a suction In a turbofan molded with a thermoplastic resin so that the shroud that forms the air guide wall is fixed and integrated, a concave fitting with a flat surface perpendicular to the rotation axis at the bottom of each blade at the blade tip side Forming a convex fitting portion having a flat surface extending in parallel with the rotation axis and having a flat surface perpendicular to the rotation axis at a position facing each blade of the fan body of the shroud. The flat surfaces of the concave fitting portion and the convex fitting portion are in close contact and are integrally joined.

以上説明したように、本発明によれば、各翼の翼先端側に形成された凹状嵌合部及びシュラウドのファン本体の各翼と相対する位置に形成された凸状嵌合部はそれぞれ回転軸と垂直な平坦面を有するので、シュラウドとファン本体の組立時のターボファン回転軸方向に加圧される際、少なくとも凸状嵌合部及び凹状嵌合部の両平坦面で確実に力を受けて溶着されるので、組立て不具合が防止でき、さらに凸状嵌合部及び凹状嵌合部のそれぞれの前記平坦面と側面、さらにシュラウド表面と翼先端側の接合面とが同時に溶着されてシュラウドとファン本体の溶着面となり、全体として溶着面が増加し強度が向上し、品質の高いターボファンが得られる。   As described above, according to the present invention, the concave fitting portion formed at the blade tip side of each blade and the convex fitting portion formed at a position facing each blade of the fan body of the shroud are respectively rotated. Since it has a flat surface perpendicular to the shaft, when pressure is applied in the direction of the rotation axis of the turbofan during assembly of the shroud and the fan body, force is surely applied to at least the flat surfaces of the convex fitting portion and the concave fitting portion. Since it is received and welded, assembly failure can be prevented, and the flat surface and side surface of each of the convex fitting portion and the concave fitting portion, and the shroud surface and the joint surface on the blade tip side are simultaneously welded to form the shroud. As a whole, the welding surface of the fan body is increased, the welding surface is increased, the strength is improved, and a high-quality turbo fan is obtained.

実施の形態１．
図１は本発明の実施の形態１に係るターボファンのシュラウドとファン本体の組立時の状態を示す斜視図、図２は同ターボファンの構成を示す斜視図、図３は同ターボファンのファン本体の構成を示す斜視図、図４は同ターボファンのファン本体の翼一枚の部分を示す拡大斜視図、図５は同ターボファンのシュラウドのファン内部側から見た状態を示す斜視図、図６（ａ）はシュラウドとファン本体の組立時の状態の概略を示す縦断面図、図６（ｂ）はシュラウドとファン本体の組立時の状態の概略を示す斜視図、図７（ａ）はファン本体の嵌合凹部近傍の空気の流れＡの様子を示した斜視図、図７（ｂ）はファン本体の嵌合凹部近傍の空気流れＡの様子を示した模式図である。 Embodiment 1 FIG.
1 is a perspective view showing a state of an assembly of a shroud and a fan body of a turbo fan according to Embodiment 1 of the present invention, FIG. 2 is a perspective view showing a configuration of the turbo fan, and FIG. 3 is a fan of the turbo fan FIG. 4 is a perspective view showing a configuration of the main body, FIG. 4 is an enlarged perspective view showing a portion of one blade of the fan main body of the turbo fan, and FIG. 5 is a perspective view showing a state of the turbo fan shroud as viewed from the inside of the fan. 6A is a longitudinal sectional view showing an outline of a state when the shroud and the fan body are assembled, FIG. 6B is a perspective view showing an outline of a state when the shroud and the fan body are assembled, and FIG. FIG. 7 is a perspective view showing the state of air flow A in the vicinity of the fitting recess of the fan body, and FIG. 7B is a schematic diagram showing the state of air flow A in the vicinity of the fitting recess of the fan body.

図１、図２において、本発明の実施の形態１に係るターボファン１は、円盤状の主板２の周辺部に複数の翼３が立設した状態で一体成形されたファン本体９と、ファン本体９の複数の翼３の翼先端側に組み付けられ、ファンの吸込導風路を形成するシュラウド４とで構成されている。
その主板２は、その中央部にモータを覆うように形成された凸形状のハブ２ａと、ハブ２ａの中心部にモータのシャフトが高さ方向（図１の上下方向）に挿入されて固定されるボス２ｂとを有している。 1 and 2, a turbo fan 1 according to Embodiment 1 of the present invention includes a fan main body 9 integrally formed with a plurality of blades 3 standing on the periphery of a disk-shaped main plate 2, and a fan. The main body 9 includes a shroud 4 which is assembled to the blade tip side of the plurality of blades 3 and forms a fan air intake passage.
The main plate 2 has a convex hub 2a formed so as to cover the motor at the center thereof, and the shaft of the motor is inserted and fixed in the height direction (vertical direction in FIG. 1) at the center of the hub 2a. Boss 2b.

また、図３、図４、図６（ａ）、（ｂ）において、主板２に立設する翼３は、その翼先端側の翼先端部３ａと、内部が中空の翼中空部３ｂとを有して形成されている。
そして、翼３の翼先端部３ａのうち、シュラウド４との接合面３ｃには、翼先端側に開口をもち翼先端部３ａから主板２側へ向け徐々に狭くなる凹状嵌合部５が形成されている。その凹状嵌合部５は回転軸方向に延びる凹状嵌合部側面５ａと、底部に回転軸と垂直方向で主板２と平行な底部である凹状嵌合部平坦面５ｂとを有している。 3, 4, 6 (a) and 6 (b), a blade 3 standing on the main plate 2 includes a blade tip 3 a on the blade tip side and a blade hollow 3 b having a hollow inside. It is formed.
Of the blade tip 3a of the blade 3, a concave fitting portion 5 having an opening on the blade tip side and gradually narrowing from the blade tip 3a toward the main plate 2 is formed on the joint surface 3c with the shroud 4. Has been. The concave fitting portion 5 has a concave fitting portion side surface 5a extending in the rotation axis direction and a concave fitting portion flat surface 5b which is a bottom portion perpendicular to the rotation axis and parallel to the main plate 2.

さらに、図５に示すように、シュラウド４には、ファン本体９の翼３と相対する位置に、先細り形状の凸状嵌合部７が形成されている。その凸状嵌合部７は回転軸方向に延びる凸状嵌合部側面５ａと、底部に回転軸と垂直方向で主板２と平行な底部である凸状嵌合部平坦面７ｂと、シュラウド外側表面に開口をもつ嵌合凹部７ｃとを有している。   Further, as shown in FIG. 5, the shroud 4 is formed with a tapered convex fitting portion 7 at a position facing the blade 3 of the fan main body 9. The convex fitting portion 7 includes a convex fitting portion side surface 5a extending in the rotation axis direction, a convex fitting portion flat surface 7b which is a bottom portion perpendicular to the rotation axis and parallel to the main plate 2, and a shroud outer side. It has a fitting recess 7c having an opening on the surface.

ファン組立時、図２、図６（ａ）、（ｂ）に示すように、翼３の凹状嵌合部５にシュラウド４の凸状嵌合部７が挿入され、ターボファン１の回転軸方向（上下方向）にシュラウド４、主板２が加圧される際、凸状嵌合部７及び凹状嵌合部５の各平坦面７ｂ、５ｂと各側面部７ａ、５ａ、さらにシュラウド４と翼先端部３ａの接合面３ｃとがシュラウド４とファン本体９の溶着面となり、例えば超音波溶着にて一体に組み立てられる。なお組立て固着方法として、接着剤等用いてもよい。   When the fan is assembled, as shown in FIGS. 2, 6 (a) and 6 (b), the convex fitting portion 7 of the shroud 4 is inserted into the concave fitting portion 5 of the blade 3, and the rotation direction of the turbofan 1 When the shroud 4 and the main plate 2 are pressed in the vertical direction, the flat surfaces 7b and 5b and the side surface portions 7a and 5a of the convex fitting portion 7 and the concave fitting portion 5, and the shroud 4 and the blade tip The joint surface 3c of the portion 3a serves as a welding surface for the shroud 4 and the fan main body 9, and is integrally assembled by, for example, ultrasonic welding. Note that an adhesive or the like may be used as an assembly fixing method.

この実施の形態１のようにターボファン１を形成することにより、ファン本体９の翼先端部３ａの凹状嵌合部５とシュラウド４におけるファン本体９の翼３と相対する位置に形成される凸状嵌合部７とはそれぞれ回転軸と垂直な平坦面５ａ、７ａを有するので、シュラウド４とファン本体９の組立て溶着時においてターボファン１の回転軸方向（上下方向）に加圧される際、凸状嵌合部７及び凹状嵌合部５の両平坦面５ａ、７ａで確実に力を受けて溶着されるので、組立て不具合が防止できる。
さらに、凸状嵌合部７及び凹状嵌合部５のそれぞれの平坦面５ｂ、７ｂ及び側面５ａ、７ａ、さらにシュラウド４と翼３の接合面３ｃとが同時に溶着されてシュラウド４とファン本体９の溶着面となり、従来のターボファンに比べ全体として溶着面が増加して強度が向上し、品質の高いターボファンを得られる。 By forming the turbo fan 1 as in the first embodiment, a convex formed at a position opposite to the concave fitting portion 5 of the blade tip 3 a of the fan main body 9 and the blade 3 of the fan main body 9 in the shroud 4. Since the shape fitting portion 7 has flat surfaces 5a and 7a perpendicular to the rotation axis, respectively, when the shroud 4 and the fan body 9 are assembled and welded, the pressure is applied in the rotation axis direction (vertical direction) of the turbofan 1 Since both the flat surfaces 5a and 7a of the convex fitting portion 7 and the concave fitting portion 5 are welded by receiving the force with certainty, assembly problems can be prevented.
Further, the flat surfaces 5b and 7b and the side surfaces 5a and 7a of the convex fitting portion 7 and the concave fitting portion 5, respectively, and the shroud 4 and the joint surface 3c of the blade 3 are welded simultaneously, so that the shroud 4 and the fan main body 9 are welded. Compared with the conventional turbofan, the welded surface increases as a whole, the strength is improved, and a high-quality turbofan can be obtained.

また、嵌合凹部がファン外側に突出している場合、この突出部によりシュラウド４の表面の空気の流れＡが拡散されて乱されることにより、吹出口８からの空気の流れと干渉、乱れ騒音が悪化してしまうが、この実施の形態１のように、シュラウド４の凸状嵌合部７のシュラウド外側表面に開口をもつ嵌合凹部７ｃは、図７（ａ）、（ｂ）に示すように、シュラウド４の外側に突出せず、へこんだ凹形状となるため、シュラウド４の表面の空気の流れＡは嵌合凹部７ｃを通って拡散しないため、ファン吹出口８からの流れに乱れを与えず騒音悪化を抑制することができる。   In addition, when the fitting recess protrudes to the outside of the fan, the air flow A on the surface of the shroud 4 is diffused and disturbed by the protrusion, thereby interfering with the air flow from the outlet 8 and turbulence noise. As shown in the first embodiment, the fitting recess 7c having an opening on the outer surface of the shroud 4 of the shroud 4 is shown in FIGS. 7 (a) and 7 (b). As described above, the air flow A on the surface of the shroud 4 does not diffuse through the fitting recess 7 c because it does not protrude outward from the shroud 4, and is therefore disturbed by the flow from the fan outlet 8. Noise deterioration can be suppressed without giving any noise.

実施の形態２．
図８は本発明の実施の形態２に係るターボファンの構成を示す斜視図、図９は同ターボファンのシュラウドとファン本体の組立時の状態を示す斜視図、図１０は同ターボファンのシュラウドのファン内部側から見た状態を示す斜視図である。
この実施の形態２において、実施の形態１と同様の構成は実施の形態１と同一符号を付して重複した構成の説明を省略する。
図８、図９において、この実施の形態２における主板２に立設する翼３は実施の形態１の中空構造と異なり、薄肉で平板状に構成されている。 Embodiment 2. FIG.
FIG. 8 is a perspective view showing a configuration of a turbo fan according to Embodiment 2 of the present invention, FIG. 9 is a perspective view showing a state when the turbo fan shroud and the fan body are assembled, and FIG. 10 is a turbo fan shroud. It is a perspective view which shows the state seen from the fan inside side.
In the second embodiment, the same configurations as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and the description of the overlapping configurations is omitted.
8 and 9, the blade 3 standing on the main plate 2 in the second embodiment is configured to be thin and flat unlike the hollow structure of the first embodiment.

その翼３の翼先端部３ａのうち、シュラウド４との接合面３ｃには翼先端側に開口をもち翼先端部３ａから主板２側へ向け徐々に先細り形状の凹状嵌合部５が形成されている。その凹状嵌合部５は底部に主板２との平行の凹状嵌合部平坦面５ｂを有している。
また、図９、図１０に示すように、シュラウド４におけるファン本体９の翼３と相対する位置に、ファン内部側面から回転軸と平行に延出し、先細りの薄肉平板状の凸状嵌合部７が形成されている。その凸状嵌合部７は底部に回転軸と垂直で主板２と平行な平坦面７ｂを有している。 Of the blade tip 3a of the blade 3, a concave fitting portion 5 having an opening on the blade tip side and gradually tapering from the blade tip 3a toward the main plate 2 is formed on the joint surface 3c with the shroud 4. ing. The concave fitting portion 5 has a concave fitting portion flat surface 5b parallel to the main plate 2 at the bottom.
Further, as shown in FIGS. 9 and 10, in the shroud 4, at the position facing the blade 3 of the fan main body 9, the taper-shaped thin flat plate-like convex fitting portion that extends from the inner side surface of the fan in parallel with the rotation axis. 7 is formed. The convex fitting portion 7 has a flat surface 7b at the bottom that is perpendicular to the rotation axis and parallel to the main plate 2.

ファン組立て時、図９に示すように、翼３の凹状嵌合部５にシュラウド４と平板状の凸状嵌合部７が挿入され、ターボファン１の回転軸方向（上下方向）にシュラウド４、主板２が加圧される際、凸状嵌合部７及び凹状嵌合部５の各平坦面７ｂ、５ｂと各側面部７ａ、５ａ、さらにシュラウド４と翼先端部３ａの接合面３ｃとがシュラウド４とファン本体９の溶着面となり一体に組み立てられる。   When the fan is assembled, as shown in FIG. 9, the shroud 4 and the flat convex fitting portion 7 are inserted into the concave fitting portion 5 of the blade 3, and the shroud 4 is arranged in the rotational axis direction (vertical direction) of the turbofan 1. When the main plate 2 is pressed, the flat surfaces 7b and 5b and the side surfaces 7a and 5a of the convex fitting portion 7 and the concave fitting portion 5, and the joint surface 3c of the shroud 4 and the blade tip portion 3a Becomes a welding surface of the shroud 4 and the fan main body 9 and is assembled integrally.

この実施の形態２のようにターボファンを形成することにより、翼３が中空構造でなく薄肉平板状であっても、ファン本体９の翼３の凹状嵌合部５及びシュラウド４におけるファン本体４の翼３と相対する位置に形成される凸状嵌合部７には、それぞれ回転軸と垂直な平坦面５ｂ、７ｂを有するので、シュラウド４とファン本体９の組立て溶着時のターボファンの回転軸方向（上下方向）に加圧される際、凸状嵌合部７および凹状嵌合部５の両平坦面５ａ、７ａで確実に力を受けて溶着されので、組立て不具合が防止できる。
さらに、凸状嵌合部７及び凹状嵌合部５のそれぞれの平坦面５ｂ、７ｂ及び側面５ａ、７ａ、さらにシュラウド４と翼先端部３ａの接合面３ｃとが同時に溶着されてシュラウド４とファン本体９の溶着面となり、、従来のターボファンに比べ全体として溶着面が増加して強度が向上し、品質の高いターボファンを得られる。 By forming the turbo fan as in the second embodiment, even if the blade 3 is not a hollow structure but a thin flat plate shape, the fan body 4 in the concave fitting portion 5 of the blade 3 of the fan body 9 and the shroud 4. Since the convex fitting portion 7 formed at a position facing the blade 3 has flat surfaces 5b and 7b perpendicular to the rotation axis, the rotation of the turbofan during assembly and welding of the shroud 4 and the fan body 9 is performed. When pressure is applied in the axial direction (vertical direction), both the flat surfaces 5a and 7a of the convex fitting portion 7 and the concave fitting portion 5 are surely welded and welded, so that assembly problems can be prevented.
Further, the flat surfaces 5b and 7b and the side surfaces 5a and 7a of the convex fitting portion 7 and the concave fitting portion 5, respectively, and the shroud 4 and the joint surface 3c of the blade tip portion 3a are welded at the same time, so that the shroud 4 and the fan. It becomes the welding surface of the main body 9, and as a whole, the welding surface is increased as compared with the conventional turbofan, the strength is improved, and a high quality turbofan can be obtained.

また、この実施の形態２では、主板２に立設する翼３は薄肉で平板状に構成され、翼３の凹状嵌合部５に嵌合するシュラウド４におけるファン本体９の翼３と相対する位置に形成される凸状嵌合部７も薄肉平板状であるので、翼３とシュラウド４の凸状嵌合部７とが中空である実施の形態１に比べ、主板２と主板２に形成される翼３との一体成形が容易であり、シュラウド４とシュラウド４に形成される複数の凸状嵌合部７との一体成形も容易となった。   In the second embodiment, the blade 3 standing on the main plate 2 is thin and has a flat plate shape, and is opposed to the blade 3 of the fan main body 9 in the shroud 4 fitted to the concave fitting portion 5 of the blade 3. Since the convex fitting portion 7 formed at the position is also a thin flat plate, it is formed on the main plate 2 and the main plate 2 as compared with the first embodiment in which the convex fitting portion 7 of the wing 3 and the shroud 4 is hollow. It is easy to integrally mold the blade 3 and the shroud 4 and the plurality of convex fitting portions 7 formed on the shroud 4.

本発明の実施の形態１に係るターボファンのシュラウドとファン本体の組立時の状態を示す斜視図。The perspective view which shows the state at the time of the assembly of the shroud and fan main body of the turbofan which concerns on Embodiment 1 of this invention. 同ターボファンの構成を示す斜視図。The perspective view which shows the structure of the turbo fan. 同ターボファンのファン本体の構成を示す斜視図。The perspective view which shows the structure of the fan main body of the turbo fan. 同ターボファンのファン本体の翼一枚の部分を示す拡大斜視図。The expansion perspective view which shows the part of one blade of the fan main body of the turbofan. 同ターボファンのシュラウドのファン内部側から見た状態を示す斜視図。The perspective view which shows the state seen from the fan inner side of the shroud of the turbofan. （ａ）はシュラウドとファン本体の組立て時の縦断面概略図。（ｂ）はシュラウドとファン本体の組立て時の斜視概略図。(A) is a longitudinal cross-sectional schematic diagram at the time of an assembly of a shroud and a fan main body. FIG. 4B is a schematic perspective view when the shroud and the fan main body are assembled. （ａ）はファン本体の嵌合凹部近傍の空気の流れＡの様子を示した斜視図。（ｂ）はファン本体の嵌合凹部近傍の空気の流れＡの様子を示した模式図。(A) is the perspective view which showed the mode of the air flow A of the fitting recessed part vicinity of a fan main body. (B) is the schematic diagram which showed the mode of the air flow A near the fitting recessed part of a fan main body. 本発明の実施の形態２に係るターボファンの構成を示す斜視図。The perspective view which shows the structure of the turbo fan which concerns on Embodiment 2 of this invention. 同ターボファンのシュラウドとファン本体の組立時の状態を示す斜視図。The perspective view which shows the state at the time of the assembly of the shroud and fan body of the turbofan. 同ターボファンのシュラウドのファン内部側から見た状態を示す斜視図。The perspective view which shows the state seen from the fan inner side of the shroud of the turbofan.

符号の説明Explanation of symbols

１ ターボファン、２ 主板、２ａ ハブ、２ｂ ボス、３ 翼、３ａ 翼先端部、３ｂ 翼中空部、３ｃ 接合面、４ シュラウド、５ 凹状嵌合部、５ａ 凹状嵌合部側面、５ｂ 凹状嵌合部平坦面、７ 凸状嵌合部、７ａ 凸状嵌合部側面、７ｂ 凸状嵌合部平坦面、７ｃ 嵌合凹部、８ ファン吹出口、９ ファン本体、Ａ 空気の流れ。
1 turbofan, 2 main plate, 2a hub, 2b boss, 3 blade, 3a blade tip, 3b blade hollow, 3c joint surface, 4 shroud, 5 concave fitting portion, 5a concave fitting side surface, 5b concave fitting Part flat surface, 7 convex fitting part, 7a convex fitting part side face, 7b convex fitting part flat surface, 7c fitting concave part, 8 fan outlet, 9 fan body, A air flow.

Claims (4)

中央部にモータの回転軸に固定されるボスを有する主板の周辺で該ボスの周囲に複数枚の翼を立設した状態で一体成形されたファン本体と、吸込み導風壁を形成するシュラウドとが固着されて一体となるよう熱可塑性樹脂で成形されたターボファンにおいて、
各翼の翼先端側に、底部に回転軸と垂直な平坦面を有する凹状嵌合部をそれぞれ形成し、かつシュラウドのファン本体の各翼と相対する位置に、回転軸と平行に延出し、底部に回転軸と垂直な平坦面を有する凸状嵌合部をそれぞれ形成し、少なくとも前記凹状嵌合部と前記凸状嵌合部の平坦面が密着して一体に接合されたことを特徴とするターボファン。 A fan body integrally molded with a plurality of blades standing around the boss around the main plate having a boss fixed to the rotating shaft of the motor in the center; and a shroud forming a suction air guide wall In a turbofan molded with a thermoplastic resin so that is fixed and united,
A concave fitting portion having a flat surface perpendicular to the rotation axis is formed on the blade tip side of each blade, and extends parallel to the rotation shaft at a position facing each blade of the fan body of the shroud, A convex fitting portion having a flat surface perpendicular to the rotation axis is formed at the bottom, respectively, and at least the concave fitting portion and the flat surface of the convex fitting portion are in close contact and integrally joined. Turbo fan to do. 前記凸状嵌合部はシュラウド外側表面に開口をもつ嵌合凹部を有することを特徴とする請求項１記載のターボファン。   The turbofan according to claim 1, wherein the convex fitting portion has a fitting concave portion having an opening on an outer surface of the shroud. 前記凸状嵌合部は薄肉平板状であることを特徴とする請求項１記載のターボファン。   The turbofan according to claim 1, wherein the convex fitting portion has a thin flat plate shape. 前記凹状嵌合部を有する翼は薄肉平板状であることを特徴とする請求項１又は３記載のターボファン。
The turbofan according to claim 1 or 3, wherein the blade having the concave fitting portion is a thin flat plate.
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