JP2005065359A

JP2005065359A - Cooling fan for rotary electric machine and its manufacturing process

Info

Publication number: JP2005065359A
Application number: JP2003207302A
Authority: JP
Inventors: Hiromoto Shimaya; 宏基嶋屋; Tatsuya Katayama; 達也片山
Original assignee: Nishishiba Electric Co Ltd
Current assignee: Nishishiba Electric Co Ltd
Priority date: 2003-08-12
Filing date: 2003-08-12
Publication date: 2005-03-10
Anticipated expiration: 2023-08-12
Also published as: JP3834775B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high efficiency low noise cooling fan for rotary electric machine in which torsional strength is ensured. <P>SOLUTION: Since the fan for cooling the interior of a rotary electric machine is a centrifugal cooling fan where the blade has an annular, arcuate or wing-like cross-section, blade fixing angle can be set larger than that of a conventional one and since section modulus is increased in the torsional direction, sufficient strength can be attained against torsional vibration of an engine. Furthermore, inlet angle and outlet angle of the blade can be determined arbitrarily by employing an arcuate shape or the fan efficiency can be enhanced while reducing noise by employing a blade shape having inside/outside diameter ratio of 0.6 or above. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は回転電機の機内冷却をするための回転電機用冷却ファンとその製造方法に関する。
【０００２】
【従来の技術】
従来の冷却ファンを備えた回転電機を図３及び図４を参照して説明する。
図３は従来の冷却ファンを備えた回転電機の断面図であり、１は回転機フレーム、２は回転機フレーム１に嵌装された固定子、３は回転機フレーム１の両側に設けられた軸受、４は軸受３に支持されたシャフト、５はシャフト４に嵌装され，固定子２とギャップを介して配設された回転子、６はシャフト４に嵌装された冷却ファンである。
【０００３】
このような構成の回転電機では、冷却ファン６により冷却風Ｗを回転軸の一方、図では右側から吸引し、回転子５および固定子２を冷却して回転軸の他方、図では左側から排気する冷却構造となっている。環状の中空羽根に関しては、例えば特許文献１に開示されている。
【０００４】
図４は従来の冷却ファンの詳細図であり、同図（ａ）は側面図、同図（ｂ）は平面図である。冷却ファンは、主板７と羽根８と副板９とから構成されている。この羽根８は所定幅に切断した所定径の丸形鋼管内に整形用金型の一方を挿入し、その後丸形鋼管を整形用金型の他方に設けたプレス機械により押圧して所望の中空羽根を製作する。
【０００５】
【特許文献１】
特開昭５９−２１２１３７号公報
【０００６】
【発明が解決しようとする課題】
上記のような回転電機はディーゼルエンジンやガスエンジンと組合わせられることが多く、これら内燃式原動機は一般にピストンの往復運動を回転運動に変換する際、ねじり振動が発生することが知られている。従来の冷却ファンの羽根は、エンジンのねじり振動と共振すると、強度が十分でないため破断に至る可能性があった。
【０００７】
本発明（請求項１乃至請求項３対応）は、上記状況に鑑みてなされたもので、その課題は、冷却ファンの羽根断面を環状でかつ円弧形状または翼形状とすることによりねじり方向の強度を確保すると共に、高効率で低騒音の回転電機用冷却ファンとその製造方法を提供することにある。
【０００８】
【課題を解決するための手段】
上記課題を達成するために、請求項１に記載の発明は、回転電機の機内冷却をするための回転電機用冷却ファンにおいて、冷却ファンはその羽根断面形状が環状で、かつ円弧形状または翼形状であることを特徴とする。
【０００９】
請求項１に記載の発明によると、従来の羽根に比べ羽根取り付け角度θが大きくなるので、ねじり方向の断面係数が大となり、原動機のねじり振動に対して十分な強度が得られる。また、円弧形状とすることで羽根の入口角と出口角を任意に決定することができ、あるいは内外径比が０．６以上のものに翼形状を採用するとファン効率の向上と共に騒音を低減させることが可能となる。
【００１０】
請求項２に記載の回転電機用冷却ファンの製造方法の発明は、パイプをオス金型とメス金型の間に配設した後、前記オス金型に圧力を加えて前記パイプをプレス成型して所定の形状とする前に、前記パイプ内に中子を挿入し、さらに圧力を加えて所定の形状とすることを特徴とする。
請求項２に記載の発明によると、溶接作業の必要がなく、プレス作業のみで容易に羽根を製作でき、製作時間が短く安価な冷却ファンを提供できる。
【００１１】
請求項３に記載の発明は、請求項２記載の回転電機用冷却ファンの製造方法において、規格品のパイプからプレスにて羽根形状を成型する際、中子を使用することを特徴とする。
請求項３に記載の発明によると、プレス時に押し過ぎ等による作業ミスを防止でき、所定の形状が安定して得られ、また複雑な形状にも対応することができる。
【００１２】
請求項４に記載の発明は、請求項２記載の回転電機用冷却ファンの製造方法において、規格品のパイプからプレスにて羽根形状を成型する際、前記メス金型に磁石を設けたことを特徴とする。
請求項４に記載の発明によると、プレス時にパイプを金型に設置する際、パイプの位置決めをする必要がなく、常に金型の中央にパイプが設置されるので、作業ミスを防止でき、品質を向上させることができる。
【００１３】
【発明の実施の形態】
以下、本発明の実施形態を図を参照して説明する。
図１は本発明の第１実施形態（請求項１対応）の回転電機用冷却ファンの構成図であり、同図（ａ）は側面図、同図（ｂ）は正面図である。なお、本実施形態の回転電機の冷却ファンが、既に説明した図４の従来の回転電機の冷却ファンと同一構成部分には同一符号を付して重複説明は省略する。
【００１４】
図１に示すように、本実施形態の冷却ファンは遠心型冷却ファンであり、主板７と羽根８と副板９とが一体に構成されており、羽根８の断面形状は環状でかつ円弧状に形成されている。この羽根８の枚数は任意とすることができる。
【００１５】
このように、断面形状が環状でかつ円弧状に形成された羽根８は、従来の羽根に比べて羽根取付角度θが大きくなるため、ねじり方向の断面係数が大となり、冷却ファンのねじり方向の固有振動数を上げることができる。その結果、ディーゼルエンジンやガスエンジン等、原動機のねじり振動の周波数と冷却ファンの固有振動数を十分離すことが可能となり、共振により破損に至る可能性が非常に小さくなる。また、円弧状とすることで羽根の入口角と出口角を任意に決定することができ、ファン効率の向上と騒音を低減させることが可能となる。
【００１６】
本発明の第１実施形態の変形例として、第１実施形態の羽根断面形状を翼形状とするものであり、第１実施形態と同様の効果がある。また、内外径比が０．６以上のものに翼形状を採用すると、著しいファン効率の向上と騒音を低減させることが可能となる。
【００１７】
図２は本発明の第２実施形態（請求項２対応）の羽根の製造方法を説明するための図であり、同図（ａ）はパイプをメス金型上に配置した側面図、同図（ｂ）はオス金型に所定の圧力を加えてパイプを所定形状にプレス成型した側面図である。
【００１８】
図において、本実施形態の羽根は、同図（ａ）に示すように市販されている規格パイプ１０、例えば一般構造用鋼管をメス金型１２上に配置し、次に、オス金型１１に所定の圧力を加えてパイプ１０をプレス成型して所定形状の羽根に成型する。
【００１９】
本実施形態では、上記のようにパイプをプレス成型して所定形状の羽根を成型するので、従来のように溶接作業の必要性がなくなり、プレス作業のみで容易に羽根を製作することができるので、製作時間が短く安価な冷却ファンを提供できる。
【００２０】
本発明の第３実施形態（請求項３対応）は、パイプをプレス成型して羽根を製作する際、図２（ｂ）に示すように、パイプ１０が所定の形状になる前に羽根断面の中空部分の中央部に中子１４を挿入する。このようにすると、パイプ１０のプレス時に押し過ぎ等による作業ミスを防止でき、所定形状の羽根を安定して得られる。また、オス金型１１、メス金型１２及び中子１４を変更することにより異なる円弧形状または翼形状の羽根を容易に成型することができる。
【００２１】
本発明の第４実施形態（請求項４対応）は、オス金型１１またはメス金型１２もしくは両方の金型の中心状に磁石１３を埋め込むと、プレス時にパイプ１０を金型に設置する際、パイプの位置決めをする必要がなく、常に金型の中央にパイプが設置されるので、作業ミスを防止でき、品質を向上させることができる。
【００２２】
【発明の効果】
以上説明したように、本発明によれば、羽根断面形状が環状でかつ円弧形状または翼形状とすることで、エンジンのねじり振動に対して十分な強度を確保すると共に、高効率で低騒音の冷却ファンを得ることが可能となる。
【００２３】
また、規格のパイプからプレス成型する際、金型に磁石を埋め込むとパイプの位置決めをする必要がなく、容易に羽根が製造でき、製作時間の短縮と安価な冷却ファンが製造可能となる。
【図面の簡単な説明】
【図１】本発明の第１実施形態の回転電機用冷却ファンの構成図であり、同図（ａ）は側面図、同図（ｂ）は正面図。
【図２】本発明の第２実施形態の羽根の製造方法を説明するための図であり、同図（ａ）はパイプをメス金型上に配置した側面図、同図（ｂ）はオス金型に所定の圧力を加えてパイプを所定形状にプレス成型した側面図。
【図３】従来の冷却ファンを備えた回転電機の断面図。
【図４】従来の冷却ファンの構成図て、同図（ａ）は側面図、同図（ｂ）は平面図。
【符号の説明】
１…回転電機のフレーム、２…固定子、３…軸受、４…シャフト、５…回転子、６…冷却ファン、７…主板、８…羽根、９…副板、１０…規格パイプ、１１…オス金型、１２…メス金型、１３…磁石、１４…中子。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cooling fan for a rotating electrical machine for cooling the inside of the rotating electrical machine and a method for manufacturing the same.
[0002]
[Prior art]
A conventional rotating electrical machine having a cooling fan will be described with reference to FIGS.
FIG. 3 is a cross-sectional view of a conventional rotating electrical machine equipped with a cooling fan. 1 is a rotating machine frame, 2 is a stator fitted to the rotating machine frame 1, and 3 is provided on both sides of the rotating machine frame 1. A bearing 4 is a shaft supported by the bearing 3, 5 is a rotor fitted to the shaft 4 through a gap with the stator 2, and 6 is a cooling fan fitted to the shaft 4.
[0003]
In the rotating electrical machine having such a configuration, the cooling fan 6 sucks the cooling air W from one side of the rotary shaft, in the drawing, from the right side, cools the rotor 5 and the stator 2, and exhausts from the other side of the rotary shaft, in the drawing, from the left side. It has a cooling structure. For example, Patent Document 1 discloses an annular hollow blade.
[0004]
4A and 4B are detailed views of a conventional cooling fan. FIG. 4A is a side view and FIG. 4B is a plan view. The cooling fan is composed of a main plate 7, a blade 8 and a sub plate 9. The blade 8 is inserted into a round steel pipe having a predetermined diameter cut into a predetermined width, one of the shaping molds is inserted, and then the round steel pipe is pressed by a press machine provided on the other of the shaping molds to obtain a desired hollow shape. Make feathers.
[0005]
[Patent Document 1]
JP-A-59-212137 [0006]
[Problems to be solved by the invention]
The rotary electric machine as described above is often combined with a diesel engine or a gas engine. It is known that these internal combustion motors generally generate torsional vibration when converting the reciprocating motion of the piston into the rotational motion. When the blades of the conventional cooling fan resonate with the torsional vibration of the engine, there is a possibility that the blades may break due to insufficient strength.
[0007]
The present invention (corresponding to claims 1 to 3) has been made in view of the above situation, and the problem is that the strength of the torsional direction is improved by making the blade cross section of the cooling fan into an annular shape and an arc shape or a blade shape. It is another object of the present invention to provide a cooling fan for a rotating electrical machine with high efficiency and low noise and a method for manufacturing the same.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is a cooling fan for a rotating electrical machine for cooling the interior of the rotating electrical machine, wherein the cooling fan has an annular blade cross-sectional shape and an arc shape or a blade shape. It is characterized by being.
[0009]
According to the first aspect of the present invention, the blade attachment angle θ is larger than that of the conventional blade, so that the sectional modulus in the torsional direction is large, and sufficient strength against the torsional vibration of the prime mover can be obtained. In addition, it is possible to arbitrarily determine the inlet and outlet angles of the blades by using an arc shape, or if the blade shape is adopted for an inner / outer diameter ratio of 0.6 or more, the fan efficiency is improved and noise is reduced. It becomes possible.
[0010]
In the invention of the method of manufacturing a cooling fan for a rotating electrical machine according to claim 2, after the pipe is disposed between the male mold and the female mold, pressure is applied to the male mold to press-mold the pipe. Before the predetermined shape is obtained, a core is inserted into the pipe, and pressure is further applied to obtain the predetermined shape.
According to the second aspect of the present invention, there is no need for a welding operation, and the blade can be easily manufactured only by the pressing operation, and an inexpensive cooling fan can be provided with a short manufacturing time.
[0011]
According to a third aspect of the present invention, in the method for manufacturing a cooling fan for a rotating electric machine according to the second aspect, a core is used when a blade shape is molded from a standard pipe by a press.
According to the third aspect of the present invention, it is possible to prevent an operational error due to excessive pressing during pressing, to obtain a predetermined shape stably, and to cope with a complicated shape.
[0012]
According to a fourth aspect of the present invention, in the method for manufacturing a cooling fan for a rotating electric machine according to the second aspect, when the blade shape is molded from a standard pipe by a press, a magnet is provided in the female mold. Features.
According to the invention described in claim 4, when installing the pipe in the mold at the time of pressing, it is not necessary to position the pipe, and the pipe is always installed in the center of the mold. Can be improved.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a configuration diagram of a cooling fan for a rotating electrical machine according to a first embodiment of the present invention (corresponding to claim 1), wherein FIG. 1 (a) is a side view and FIG. 1 (b) is a front view. Note that the same components of the cooling fan of the rotating electrical machine of this embodiment as those of the conventional rotating electrical machine of FIG.
[0014]
As shown in FIG. 1, the cooling fan of this embodiment is a centrifugal cooling fan, and a main plate 7, a blade 8, and a sub-plate 9 are integrally formed, and the blade 8 has an annular and arcuate cross-sectional shape. Is formed. The number of blades 8 can be arbitrarily set.
[0015]
As described above, the blade 8 having an annular cross-sectional shape and an arc shape has a larger blade attachment angle θ than the conventional blade, and therefore has a larger section coefficient in the torsional direction, and the cooling fan in the torsional direction. The natural frequency can be increased. As a result, it is possible to sufficiently separate the torsional vibration frequency of the prime mover and the natural frequency of the cooling fan, such as a diesel engine or a gas engine, and the possibility of damage due to resonance becomes very small. Further, by making the shape arc, it is possible to arbitrarily determine the inlet angle and the outlet angle of the blade, and it is possible to improve fan efficiency and reduce noise.
[0016]
As a modification of the first embodiment of the present invention, the blade cross-sectional shape of the first embodiment is a wing shape, and there is an effect similar to that of the first embodiment. In addition, when the blade shape is adopted for an inner / outer diameter ratio of 0.6 or more, it is possible to significantly improve fan efficiency and reduce noise.
[0017]
FIG. 2 is a view for explaining a blade manufacturing method according to a second embodiment (corresponding to claim 2) of the present invention, wherein FIG. 2 (a) is a side view in which a pipe is arranged on a female die, and FIG. (B) is the side view which applied the predetermined pressure to the male metal mold | die, and press-molded the pipe in the predetermined shape.
[0018]
In the figure, the blade of the present embodiment has a standard pipe 10 that is commercially available, for example, a general structural steel pipe disposed on a female mold 12 as shown in FIG. The pipe 10 is press-molded by applying a predetermined pressure to form a blade having a predetermined shape.
[0019]
In the present embodiment, as described above, the pipe is press-molded to form a blade having a predetermined shape, so that there is no need for welding work as in the prior art, and the blade can be easily manufactured by only the press work. It can provide an inexpensive cooling fan with short production time.
[0020]
According to the third embodiment of the present invention (corresponding to claim 3), when a blade is manufactured by press molding a pipe, as shown in FIG. The core 14 is inserted into the central part of the hollow part. If it does in this way, the work mistake by excessive pushing etc. at the time of pressing of pipe 10 can be prevented, and the blade of predetermined shape can be obtained stably. Further, by changing the male die 11, the female die 12 and the core 14, different arc-shaped or wing-shaped blades can be easily formed.
[0021]
In the fourth embodiment of the present invention (corresponding to claim 4), when the magnet 13 is embedded in the center of the male mold 11 or the female mold 12 or both molds, the pipe 10 is installed in the mold during pressing. It is not necessary to position the pipe, and the pipe is always installed at the center of the mold, so that it is possible to prevent work mistakes and improve the quality.
[0022]
【The invention's effect】
As described above, according to the present invention, the blade cross-sectional shape is annular, circular arc shape, or blade shape, so that sufficient strength against torsional vibration of the engine is secured, and high efficiency and low noise are achieved. A cooling fan can be obtained.
[0023]
Further, when press molding from a standard pipe, if the magnet is embedded in the mold, it is not necessary to position the pipe, the blade can be easily manufactured, the manufacturing time can be shortened, and an inexpensive cooling fan can be manufactured.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a cooling fan for a rotating electrical machine according to a first embodiment of the present invention, where FIG. 1 (a) is a side view and FIG. 1 (b) is a front view.
FIGS. 2A and 2B are diagrams for explaining a blade manufacturing method according to a second embodiment of the present invention, in which FIG. 2A is a side view in which a pipe is placed on a female mold, and FIG. The side view which applied the predetermined pressure to the metal mold | die and press-molded the pipe in the predetermined shape.
FIG. 3 is a cross-sectional view of a rotating electrical machine having a conventional cooling fan.
4A and 4B are configuration diagrams of a conventional cooling fan, in which FIG. 4A is a side view and FIG. 4B is a plan view.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Rotating electrical machine frame, 2 ... Stator, 3 ... Bearing, 4 ... Shaft, 5 ... Rotor, 6 ... Cooling fan, 7 ... Main plate, 8 ... Blade, 9 ... Sub-plate, 10 ... Standard pipe, 11 ... Male mold, 12 ... female mold, 13 ... magnet, 14 ... core.

Claims

A cooling fan for a rotating electrical machine for cooling an interior of the rotating electrical machine, wherein the cooling fan has an annular blade cross-sectional shape and an arc shape or a blade shape.

After placing the pipe between the male and female molds, insert the core into the pipe before applying pressure to the male mold to press-mold the pipe into a predetermined shape. Further, a method for manufacturing a cooling fan for a rotating electric machine, wherein pressure is further applied to form a predetermined shape.

3. The method of manufacturing a cooling fan for a rotating electrical machine according to claim 2, wherein a core is used when the blade shape is molded from a standard pipe by a press.

3. The method of manufacturing a cooling fan for a rotating electrical machine according to claim 2, wherein a magnet is provided in the female die when a blade shape is molded from a standard pipe by a press. Production method.