JP2021004563A - Centrifugal impeller and manufacturing method of centrifugal impeller - Google Patents

Abstract

To efficiently and inexpensively manufacture a centrifugal impeller having a circular main plate, a cylindrical hub protruding from the circular main plate, and a torsion portion at the hub side, and also having a plurality of blade parts protruding from the circular main plate and the hub to one side in an axial direction while having a highly-efficient three-dimensional shape.SOLUTION: A resin-made interpolation member 36 in which notched holes 42 are formed at a resin-made blade main body 35 having a circular main plate 39, a hub 40 and blade parts 41, and which has interpolation parts 44 for filling the notched holes 42, and a resin-made front face plate 37 abut on each other from both sides of the blade main body 35, fusion boss parts 51 formed at the circular main plate 39 and the blade part 41, and filling the notched parts 50 which are opened at an external periphery of the circular main plate 39 protrude to the front face plate 37 side, and integrated with the interpolation member 36, and tip parts of the fusion boss parts 51 which are mildly fit into recesses 53 formed at the front face plate 37 are fused to the recesses 53.SELECTED DRAWING: Figure 3

Description

本発明は、支軸が挿通される挿通孔を中央部に有する円形主板と、略截頭円錐形状の外面を有しつつ前記挿通孔に同軸に連なる筒状に形成されて前記円形主板から前記挿通孔の軸方向一側に突出するハブと、捩じり上げられた捩じり部分を前記ハブ側の端部に有しつつ前記挿通孔の軸線方向から見て相互に重なり合うのを避ける位置で前記円形主板および前記ハブから前記軸方向一側に突出する複数の羽根部とを備える遠心羽根車、ならびにその遠心羽根車の製造方法に関する。 In the present invention, a circular main plate having an insertion hole through which a support shaft is inserted is formed in a central portion, and a cylindrical main plate having a substantially conical outer surface and coaxially connected to the insertion hole is formed from the circular main plate. A position where a hub protruding in one axial direction of the insertion hole and a twisted portion twisted up are held at the end on the hub side while avoiding overlapping with each other when viewed from the axial direction of the insertion hole. The present invention relates to a centrifugal impeller including the circular main plate and a plurality of blade portions projecting from the hub to one side in the axial direction, and a method for manufacturing the centrifugal impeller.

遠心ファンが、それぞれ軸方向に型抜き可能として形成された樹脂製の入口部と出口部とに軸方向に２分割されて成るようにしたものが、特許文献１で知られており、またハブに一体成形されるハブ側翼と、シュラウドに一体成形されるシュラウド側翼とで翼が構成されるようにしたものが、特許文献２で知られている。 It is known in Patent Document 1 that the centrifugal fan is divided into two in the axial direction into a resin inlet portion and an outlet portion formed so as to be die-cut in the axial direction, respectively, and a hub. It is known in Patent Document 2 that a wing is composed of a hub side wing integrally molded with the shroud and a shroud side wing integrally molded with the shroud.

特開昭５９−０１８２９６号公報JP-A-59-018296 特許第５２６９０２５号公報Japanese Patent No. 5269025

上記特許文献１で開示されたものでは、入口部および出口部がそれぞれ軸方向に厚くなり、遠心羽根車の軸方向大型化を招いてしまう。しかも入口部の羽根部が宙に浮いた状態となって樹脂製の羽根部の剛性が脆弱になり易く、振動や騒音が生じ易くなる。 In the one disclosed in Patent Document 1, the inlet portion and the outlet portion become thicker in the axial direction, respectively, which causes the centrifugal impeller to become larger in the axial direction. Moreover, the blades at the entrance are in a state of floating in the air, and the rigidity of the resin blades tends to be weakened, so that vibration and noise are likely to occur.

また上記特許文献２で開示されたものでは、翼による流体の送り出し効率を高めるためにハブと一体成形されるハブ側翼に捩じりを設ける際に、アンダーカットが生じないようにするためにはスライドコア、湾曲中子および引き抜き中子等を有する複雑な金型が必要となり、コストの増大を招いてしまう。 Further, in the one disclosed in Patent Document 2, in order to prevent undercut when twisting the hub side blade integrally molded with the hub in order to improve the efficiency of fluid delivery by the blade. A complicated mold having a slide core, a curved core, a drawn core, and the like is required, which causes an increase in cost.

本発明は、かかる事情に鑑みてなされたものであり、高効率な三次元形状を有しつつ効率よく低コストで製造可能とした遠心羽根車を提供することを目的とする。 The present invention has been made in view of such circumstances, and an object of the present invention is to provide a centrifugal impeller that has a highly efficient three-dimensional shape and can be manufactured efficiently and at low cost.

上記目的を達成するために、本発明は、支軸が挿通される挿通孔を中央部に有する円形主板と、略截頭円錐形状の外面を有しつつ前記挿通孔に同軸に連なる筒状に形成されて前記円形主板から前記挿通孔の軸方向一側に突出するハブと、捩じり上げられた捩じり部分を前記ハブ側の端部に有しつつ前記挿通孔の軸線方向から見て相互に重なり合うのを避ける位置で前記円形主板および前記ハブから前記軸方向一側に突出する複数の羽根部とを備える遠心羽根車において、前記円形主板、前記ハブおよび前記羽根部が樹脂製の羽根車本体に一体に設けられ、前記羽根車本体に、前記挿通孔の軸線方向での前記羽根部の投影を含む形状の切り抜き孔が形成され、当該切り抜き孔を埋めて前記円形主板、前記ハブおよび前記羽根部の表面に滑らかに連なる補間部を有する樹脂製の補間部材が、前記羽根車本体に前記挿通孔の軸線方向他側から当接され、複数の前記羽根部に前記補間部材とは反対側から樹脂製の前面プレートが当接され、前記円形主板および複数の前記羽根部に、前記円形主板の外周寄りに配置されて当該円形主板の外周に開口する切欠き部が形成され、前記切欠き部を埋めつつ前記前面プレート側に突出する複数の溶着ボス部が、前記補間部材の外周に連なる外端面を有しつつ当該補間部材に一体に突設され、前記複数の溶着ボス部の先端部をそれぞれ緩く嵌合させる複数の凹部が前記前面プレートに形成され、前記溶着ボス部の先端部が前記凹部に溶着されることを第１の特徴とする。 In order to achieve the above object, the present invention has a circular main plate having an insertion hole through which a support shaft is inserted in the central portion, and a tubular shape having a substantially cylindrical outer surface and coaxially connected to the insertion hole. A hub that is formed and projects from the circular main plate to one side in the axial direction of the insertion hole, and a twisted portion that is twisted up at the end of the hub side, as viewed from the axial direction of the insertion hole. In a centrifugal impeller including the circular main plate and a plurality of blades projecting from the hub to one side in the axial direction at positions avoiding overlapping with each other, the circular main plate, the hub, and the blades are made of resin. A cutout hole provided integrally with the impeller body and having a shape including projection of the blade portion in the axial direction of the insertion hole is formed in the impeller body, and the cutout hole is filled with the circular main plate and the hub. A resin interpolation member having an interpolation portion smoothly connected to the surface of the blade portion is brought into contact with the impeller body from the other side in the axial direction of the insertion hole, and the plurality of blade portions are referred to as the interpolation member. A resin front plate is abutted from the opposite side, and the circular main plate and the plurality of blades are formed with notches arranged near the outer periphery of the circular main plate and open to the outer periphery of the circular main plate. A plurality of welding boss portions projecting toward the front plate side while filling the notch portions are integrally projected from the interpolation member while having an outer end surface connected to the outer periphery of the interpolation member, and the plurality of welding boss portions are formed. The first feature is that a plurality of recesses for loosely fitting the tip portions are formed on the front plate, and the tip portions of the welding boss portions are welded to the recesses.

また本発明は、第１の特徴の構成に加えて、前記溶着ボス部の前記外端面から内方に離隔した位置で当該溶着ボス部の先端部に、当該溶着ボス部の前記凹部への溶着前には縦断面三角形状である突部が、一体に突設されることを第２の特徴とする。 Further, in addition to the configuration of the first feature, the present invention welds the welded boss portion to the tip portion of the welded boss portion at a position separated inward from the outer end surface of the welded boss portion to the recessed portion. The second feature is that the protrusions having a triangular vertical cross section are integrally projected in the front.

本発明は、第１または第２の特徴の構成に加えて、前記突部の溶着前の前記凹部の閉塞端部に、少なくとも前記突部を溶着させるための溶着面と、前記前面プレートの周方向で前記溶着面の両側に配置される逃がし溝とが形成されることを第３の特徴とする。 In the present invention, in addition to the configuration of the first or second feature, at least a welding surface for welding the protrusion to the closed end of the recess before welding the protrusion, and the circumference of the front plate. A third feature is that relief grooves arranged on both sides of the welded surface are formed in the direction.

本発明は、第３の特徴の構成に加えて、前記逃がし溝の前記前面プレートの外周側の端部が、当該前面プレートの外周から内方に間隔をあけた位置に設定されることを第４の特徴とする。 In the present invention, in addition to the configuration of the third feature, the end portion of the relief groove on the outer peripheral side of the front plate is set at a position spaced inward from the outer circumference of the front plate. It is a feature of 4.

さらに本発明は、第４の特徴を有する遠心羽根車を製造するための遠心羽根車の製造方法において、前記切欠き部を有する前記羽根車本体、前記凹部を有する前記前面プレートならびに先端部に前記突部が設けられた前記溶着ボス部を有する前記補間部材をそれぞれ射出成形する工程と；前記溶着ボス部を前記凹部に緩く嵌合して前記突部を前記凹部の閉塞端部に当接させつつ前記羽根車本体、前記前面プレートおよび前記補間部材を重ね合わせた状態で少なくとも前記突部を加熱溶融して前記溶着ボス部を前記凹部に溶着する工程と；をこの順に実行することを第５の特徴とする。 Further, the present invention relates to the impeller body having the notch portion, the front plate having the recessed portion, and the tip portion in the method for manufacturing the centrifugal impeller for producing the centrifugal impeller having the fourth feature. A step of injection molding each of the interpolation members having the welding boss portion provided with the protrusion; the welding boss portion is loosely fitted into the recess and the protrusion is brought into contact with the closed end portion of the recess. A fifth step is to heat and melt at least the protrusions in a state where the impeller body, the front plate, and the interpolation member are overlapped, and weld the welding boss portion to the recesses in this order. It is a feature of.

本発明の第１の特徴によれば、円形主板、ハブおよび羽根部を一体に有する樹脂製の羽根車本体に、羽根部の投影を含む形状の切り抜き孔が形成されるので、羽根部が捩じり部分を有した三次元形状のものであっても樹脂成形時のアンダーカット形状を回避することが可能であり、また切り抜き孔が樹脂製の補間部材が有する補間部で埋められるので、高効率な三次元形状の羽根部を有する遠心羽根車を低コストで薄型に製作することができる。またこのような遠心羽根車を成形する金型装置は、スライドコア、湾曲中子および引き抜き中子等や、それらを動かすための可動機構が不要となることから、製造コストが著しく低減される。しかも可動機構が不要となることで余裕が生じたスペースには複数個のキャビティを設けることができ、いわゆる「多数個取りの樹脂成形金型」を使用して遠心羽根車の部品を一挙に大量に製作することができることから、低コストで三次元形状の遠心羽根車を製作することができる。また補間部材に突設される複数の溶着ボス部が、羽根車本体の複数の羽根部および円形主板に形成されて当該円形主板の外周に開口する切欠き部を埋めつつ前面プレートに形成された凹部に溶着されるので、補間部材が、羽根車本体および前面プレートに一挙に連結、固定されることになり、これにより三次元形状の遠心羽根車を容易に製作することができる。しかも溶着ボス部が、前面プレートの外周により近い位置で前面プレートの凹部に緩く嵌合された状態で溶着されることになり、溶着時のガス抜け性を高めて溶着不良が生じないようにすることができる。 According to the first feature of the present invention, the blade portion is twisted because a cutout hole having a shape including the projection of the blade portion is formed in the resin impeller body having the circular main plate, the hub and the blade portion integrally. It is possible to avoid the undercut shape at the time of resin molding even if it has a three-dimensional shape having a rim portion, and the cutout hole is filled with the interpolation portion of the resin interpolation member, so that the height is high. A centrifugal impeller having an efficient three-dimensionally shaped blade can be manufactured thinly at low cost. Further, the mold device for forming such a centrifugal impeller does not require a slide core, a curved core, a drawing core, or a movable mechanism for moving them, so that the manufacturing cost is significantly reduced. Moreover, multiple cavities can be provided in the space where a movable mechanism is not required, and a large number of centrifugal impeller parts can be installed at once using a so-called "many-piece resin molding die". Since it can be manufactured in the above, it is possible to manufacture a three-dimensional centrifugal impeller at low cost. Further, a plurality of welding boss portions projecting from the interpolation member are formed on the front plate while filling the notches formed on the plurality of blade portions of the impeller body and the circular main plate and opening on the outer periphery of the circular main plate. Since it is welded to the recess, the interpolation member is connected and fixed to the impeller body and the front plate at once, whereby a three-dimensional centrifugal impeller can be easily manufactured. Moreover, the welding boss portion is welded in a state of being loosely fitted to the concave portion of the front plate at a position closer to the outer circumference of the front plate, thereby improving the gas release property at the time of welding and preventing welding failure. be able to.

また本発明の第２の特徴によれば、溶着ボス部の先端部に、当該溶着ボス部の凹部への溶着前には縦断面三角形状である突部が一体に突設され、その突部が、溶着ボス部の外端面から内方に離隔した位置に配置されるので、溶着時に溶着ボス部の先端部の突部を溶け易くしつつ、溶けた樹脂が遠心羽根車の外周側にはみ出すことを抑制することができ、溶着工程後に、たとえばショットブラスト加工等のバリ取り仕上げを施すことが不要となる。 Further, according to the second feature of the present invention, a protrusion having a triangular vertical cross section is integrally projected from the tip of the welding boss portion before welding the welding boss portion to the recess, and the protrusion is formed. However, since it is arranged at a position separated inward from the outer end surface of the welding boss portion, the melted resin protrudes to the outer peripheral side of the centrifugal impeller while making it easier to melt the protrusion at the tip of the welding boss portion during welding. This can be suppressed, and it becomes unnecessary to perform a deburring finish such as shot blasting after the welding process.

本発明の第３の特徴によれば、凹部の閉塞端部に、溶着面と、その溶着面の両側の逃がし溝とが形成されるので、溶着時に生じたガスを前面プレートの外周側に逃がしつつ溶着時に溶けた樹脂が遠心羽根車の外周にはみ出すことを防止して、バリ取り仕上げを施すことを不要とすることができる。 According to the third feature of the present invention, a welding surface and relief grooves on both sides of the welding surface are formed at the closed end of the recess, so that the gas generated during welding is released to the outer peripheral side of the front plate. On the other hand, it is possible to prevent the resin melted at the time of welding from protruding to the outer periphery of the centrifugal impeller, and it is possible to eliminate the need for deburring finish.

本発明の第４の特徴によれば、逃がし溝が前面プレートの外周に開口することがないので、樹脂が溶けた際に生じるガスを逃がし溝から前面プレートの外周側に逃がして溶着不良が生じることを防止しつつ、溶けた樹脂を逃がし溝側に溜めることで、溶着時に溶けた樹脂が遠心羽根車の外周側にはみ出すことをより確実に防止して、バリ取り仕上げを施すことを不要とすることができる。 According to the fourth feature of the present invention, since the relief groove does not open on the outer periphery of the front plate, the gas generated when the resin melts is released from the relief groove to the outer periphery side of the front plate, resulting in poor welding. By accumulating the melted resin on the groove side while preventing this, it is more reliable to prevent the melted resin from squeezing out to the outer peripheral side of the centrifugal impeller during welding, and it is not necessary to perform deburring finish. can do.

さらに本発明の第５の特徴によれば、羽根車本体、前面プレートおよび補間部材をそれぞれ射出成形し、その後で、溶着ボス部を前面プレートの凹部に緩く嵌合しつつ羽根車本体、前面プレートおよび補間部材を重ね合わせて加熱溶融により溶着ボス部の先端部を凹部に溶着することにより、溶着時に溶けた樹脂が遠心羽根車の外周にはみ出すことを防止しつつ、補間部材と、羽根車本体および前面プレートとを一挙に連結、固定することができ、これにより製作工程を簡易化するとともに、高効率な三次元形状の羽根部を有する遠心羽根車を低コストで薄型に製作することができる。 Further, according to the fifth feature of the present invention, the impeller body, the front plate and the interpolation member are injection-molded, respectively, and then the impeller body and the front plate are loosely fitted into the recesses of the front plate while the welding boss portion is loosely fitted. By superimposing the interpolation members and welding the tip of the welding boss to the recesses by heating and melting, the resin melted during welding is prevented from protruding to the outer periphery of the centrifugal impeller, while the interpolation member and the impeller body. And the front plate can be connected and fixed at once, which simplifies the manufacturing process and makes it possible to manufacture a centrifugal impeller with highly efficient three-dimensional blades at low cost and thinly. ..

電動流体ポンプの一部切欠き斜視図である。It is a partially cutaway perspective view of an electric fluid pump. 遠心羽根車の斜視図である。It is a perspective view of a centrifugal impeller. 遠心羽根車の分解斜視図である。It is an exploded perspective view of a centrifugal impeller. 前面プレートの凹部付近の斜視図である。It is a perspective view near the recess of the front plate. 図２の５−５線に沿う断面図である。It is sectional drawing which follows the 5-5 line of FIG.

本発明の実施の形態について添付の図１〜図５を参照しながら説明すると、先ず図１において、この電動流体ポンプは、ポンプ室６を内部に有するケーシング７と、ケーシング７に支持される支軸８と、その支軸８に回転自在に支持されるロータ１０と、当該ロータ１０に固定されて前記ポンプ室６に収容される遠心羽根車９と、前記ケーシング７外で前記ロータ１０を囲繞するステータ１１とを備える。 An embodiment of the present invention will be described with reference to FIGS. 1 to 5 attached. First, in FIG. 1, the electric fluid pump has a casing 7 having a pump chamber 6 inside and a support supported by the casing 7. The shaft 8, the rotor 10 rotatably supported by the support shaft 8, the centrifugal impeller 9 fixed to the rotor 10 and housed in the pump chamber 6, and the rotor 10 outside the casing 7 are surrounded. The stator 11 is provided.

前記ケーシング７は、前記ポンプ室６の中央部上端に開口する吸入口１２を形成しつつ上下方向に延びる吸入筒部１３ｂならびに前記ポンプ室６内の外周部に連なって接線方向に延びる吐出筒部１３ｃを有するポンプケース１３と、当該ポンプケース１３に結合される缶状のケース部材１４とで構成され、当該ケース部材１４および前記ポンプケース１３間に前記ポンプ室６が形成される。 The casing 7 has a suction cylinder portion 13b extending in the vertical direction while forming a suction port 12 opening at the upper end of the central portion of the pump chamber 6, and a discharge cylinder portion extending tangentially to the outer peripheral portion in the pump chamber 6. The pump case 13 having the 13c and a can-shaped case member 14 coupled to the pump case 13 are formed, and the pump chamber 6 is formed between the case member 14 and the pump case 13.

前記ポンプケース１３は下方に開放した皿状のポンプケース主部１３ａと、そのポンプケース主部１３ａの上端中央部に連設される前記吸入筒部１３ｂと、前記ポンプケース１３の外周に連設される前記吐出筒部１３ｃと、前記ポンプケース主部１３ａ下端から半径方向外方に張り出す第１のフランジ部１３ｄとを一体に有して合成樹脂で形成され、前記第１のフランジ部１３ｄは、その半径方向外方側が内方側よりも前記ケース部材１４側に寄せられた段付きに形成される。 The pump case 13 is connected to a dish-shaped pump case main portion 13a that is open downward, a suction cylinder portion 13b that is connected to the central portion of the upper end of the pump case main portion 13a, and an outer circumference of the pump case 13. The discharge cylinder portion 13c to be formed and the first flange portion 13d projecting outward in the radial direction from the lower end of the pump case main portion 13a are integrally provided and formed of synthetic resin, and the first flange portion 13d is formed. Is formed with a step in which the outer side in the radial direction is closer to the case member 14 side than the inner side.

前記ケース部材１４は、前記ポンプケース主部１３ａの内径よりも小さな内径を有して上方を開放した有底円筒部１４ａと、その有底円筒部１４ａの上端部から半径方向外方に張り出して前記第１のフランジ部１３ｄに下方から当接、嵌合される第２のフランジ部１４ｂとを一体に有して合成樹脂により形成される。 The case member 14 has a bottomed cylindrical portion 14a having an inner diameter smaller than the inner diameter of the pump case main portion 13a and opening upward, and the case member 14 projecting outward in the radial direction from the upper end portion of the bottomed cylindrical portion 14a. The first flange portion 13d is integrally provided with a second flange portion 14b that is brought into contact with and fitted from below, and is formed of a synthetic resin.

前記ケーシング７には、中間ケース部材１５と、その中間ケース部材１５を前記ケーシング７との間に挟むカバー部材１６が結合される。前記中間ケース部材１５は、前記有底円筒部１４ａを同軸に囲繞する円筒状のケース部材主部１５ａと、そのケース部材主部１５ａの上部から半径方向外方に張り出す第３のフランジ部１５ｂと、前記ケース部材主部１５ａの下部から半径方向外方に張り出す第４のフランジ部１５ｃとを一体に有し、前記ケース部材主部１５ａの上部および前記第３のフランジ部１５ｂは、前記第２のフランジ部１４ｂに前記第３のフランジ部１５ｂを下方から当接させて前記第２のフランジ部１４ｂに嵌合され、前記第１のフランジ部１３ｄおよび第３のフランジ部１５ｂが相互間に前記第２のフランジ部１４ｂを挟んで結合される。 An intermediate case member 15 and a cover member 16 that sandwiches the intermediate case member 15 between the casing 7 are coupled to the casing 7. The intermediate case member 15 includes a cylindrical case member main portion 15a that coaxially surrounds the bottomed cylindrical portion 14a, and a third flange portion 15b that projects outward in the radial direction from the upper portion of the case member main portion 15a. And a fourth flange portion 15c projecting outward in the radial direction from the lower portion of the case member main portion 15a, and the upper portion of the case member main portion 15a and the third flange portion 15b are described. The third flange portion 15b is brought into contact with the second flange portion 14b from below and fitted to the second flange portion 14b, and the first flange portion 13d and the third flange portion 15b are between each other. The second flange portion 14b is sandwiched between the two flange portions 14b.

前記カバー部材１６は、下端部を閉じた有底筒状に形成されるカバー部材主部１６ａと、そのカバー部材主部１６ａの上端部から半径方向外方に張り出して前記中間ケース部材１５の下端部の前記第４のフランジ部１５ｃに下方から結合される第５のフランジ部１６ｂが一体に設けられて成り、前記第４のフランジ部１５ｃおよび前記第５のフランジ部１６ｂ間には環状のシール部材１７が挟持される。 The cover member 16 protrudes outward in the radial direction from the cover member main portion 16a formed in a bottomed tubular shape with the lower end portion closed and the upper end portion of the cover member main portion 16a, and the lower end of the intermediate case member 15. A fifth flange portion 16b to be integrally provided to the fourth flange portion 15c of the portion is integrally provided, and an annular seal is provided between the fourth flange portion 15c and the fifth flange portion 16b. The member 17 is sandwiched.

前記ケース部材１４における前記有底円筒部１４ａの外面には前記ステータ１１が固定されており、このステータ１１は前記中間ケース部材１５における前記ケース部材主部１５ａで囲繞される。また前記カバー部材１６の前記カバー部材主部１６ａ内には、制御回路基板１８が収容、固定される。 The stator 11 is fixed to the outer surface of the bottomed cylindrical portion 14a of the case member 14, and the stator 11 is surrounded by the case member main portion 15a of the intermediate case member 15. Further, the control circuit board 18 is housed and fixed in the cover member main portion 16a of the cover member 16.

前記支軸８の最上方位置にある一端部は、前記ケーシング７における前記ポンプケース１３に設けられて前記吸入口１２の内側に配置される保持部２０に保持される。 One end of the support shaft 8 at the uppermost position is held by a holding portion 20 provided in the pump case 13 in the casing 7 and arranged inside the suction port 12.

前記保持部２０は、下方に開放した嵌合凹部２１を有して前記吸入筒部１３ｂの前記ポンプ室６側の端部内の中央部に配置されるものであり、この保持部２０は、前記吸入筒部１３ｂの前記ポンプ室６側の端部内周に、周方向に間隔をあけて配置される複数の支持腕部２２を介して一体に連設される。また前記ケース部材１４は、前記有底円筒部１４ａの下端閉塞部から上方に延びる円筒状の支持筒部１４ｃを一体に有しており、前記支軸８の前記一端部が前記嵌合凹部２１に嵌合、固定され、前記支軸８の他端部は前記支持筒部１４ｃ内に嵌合される。 The holding portion 20 has a fitting recess 21 opened downward and is arranged at the central portion in the end portion of the suction cylinder portion 13b on the pump chamber 6 side, and the holding portion 20 is the holding portion 20. It is integrally provided on the inner circumference of the end portion of the suction cylinder portion 13b on the pump chamber 6 side via a plurality of support arm portions 22 arranged at intervals in the circumferential direction. Further, the case member 14 integrally has a cylindrical support cylinder portion 14c extending upward from the lower end closing portion of the bottomed cylindrical portion 14a, and the one end portion of the support shaft 8 is the fitting recess 21. The other end of the support shaft 8 is fitted and fixed in the support cylinder portion 14c.

前記ロータ１０は、ロータハブ２４と、そのロータハブ２４に固定されるボンド磁石２５とから成る。前記ロータハブ２４は、前記支持筒部１４ｃを同軸に囲繞する円筒状の磁石支持部２４ａと、その磁石支持部２４ａよりも小径に形成されて前記支軸８を同軸に囲繞しつつ前記磁石支持部２４ａの上端部から上方に延出される延出筒部２４ｂとが同軸にかつ一体に連設されて成り、前記ボンド磁石２５は前記磁石支持部２４ａの外周にアウトサート成形され、前記延出筒部２４ｂの上部には、前記遠心羽根車９がスナップフィット等によって固定される。 The rotor 10 includes a rotor hub 24 and a bond magnet 25 fixed to the rotor hub 24. The rotor hub 24 has a cylindrical magnet support portion 24a that coaxially surrounds the support cylinder portion 14c, and the magnet support portion 24a that is formed to have a diameter smaller than that of the magnet support portion 24a and that coaxially surrounds the support shaft 8. The extension cylinder portion 24b extending upward from the upper end portion of the 24a is coaxially and integrally connected to the extension cylinder portion 24b, and the bond magnet 25 is outsert-formed on the outer periphery of the magnet support portion 24a to form the extension cylinder. The centrifugal impeller 9 is fixed to the upper portion of the portion 24b by a snap fit or the like.

前記ロータ１０と、そのロータハブ２４が有する前記延出筒部２４ｂに固定される前記遠心羽根車９とは、前記支軸８に、第１および第２の滑り軸受３０，３１を介して回転自在に支持される。 The rotor 10 and the centrifugal impeller 9 fixed to the extension cylinder portion 24b of the rotor hub 24 are rotatable on the support shaft 8 via first and second slide bearings 30 and 31. Supported by.

前記第１の滑り軸受３０は、前記保持部２０との間にワッシャ２８を介在させて前記延出筒部２４ｂの上部に圧入される。また前記第２の滑り軸受３１は、前記第１の滑り軸受３０とは軸方向に間隔をあけて前記延出筒部２４ｂの下部に圧入される。 The first slide bearing 30 is press-fitted into the upper portion of the extension cylinder portion 24b with a washer 28 interposed between the first slide bearing 30 and the holding portion 20. Further, the second slide bearing 31 is press-fitted into the lower portion of the extension cylinder portion 24b at an axial distance from the first slide bearing 30.

図２を併せて参照して、前記遠心羽根車９は、羽根車本体３５と、前記支軸８の軸線方向両側から前記羽根車本体３５を挟む補間部材３６および前面プレート３７とが接合されて成り、前記羽根車本体３５、前記補間部材３６および前記前面プレート３７は、それぞれ樹脂製であり、たとえばガラス繊維が混入されたポリフェニレンサルファイド（ＰＰＳ）樹脂により形成される。 With reference to FIG. 2, in the centrifugal impeller 9, the impeller body 35, an interpolation member 36 sandwiching the impeller body 35 from both sides in the axial direction of the support shaft 8, and a front plate 37 are joined. The impeller body 35, the interpolation member 36, and the front plate 37 are each made of resin, and are formed of, for example, polyphenylene sulfide (PPS) resin mixed with glass fibers.

図３を併せて参照して、前記羽根車本体３５は、前記支軸８および前記ロータ１０の前記延出筒部２４ｂが挿通される挿通孔３８を中央部に有する円形主板３９と、略截頭円錐形状の外面を有しつつ前記挿通孔３８に同軸に連なる筒状に形成されて前記円形主板３９から前記挿通孔３８の軸方向一側（電動流体ポンプへの組み付け時に上側）に突出するハブ４０と、前記ロータ１０の回転進行方向（この実施の形態ではロータ１０上方からみて右回り）に向かって捩じり上げられた捩じり部分４１ａを前記ハブ４０側の端部に有しつつ前記挿通孔３８の軸線方向から見て相互に重なり合うのを避ける位置で前記円形主板３９および前記ハブ４０から前記軸方向一側に突出する複数（たとえば５個の）羽根部４１とを一体に有する。 With reference to FIG. 3, the impeller body 35 has a circular main plate 39 having an insertion hole 38 in the center through which the extension cylinder portion 24b of the support shaft 8 and the rotor 10 is inserted, and substantially the same. It has a conical outer surface and is formed in a tubular shape coaxially connected to the insertion hole 38, and projects from the circular main plate 39 to one side in the axial direction of the insertion hole 38 (upper side when assembled to the electric fluid pump). The hub 40 and a twisted portion 41a twisted up toward the rotation traveling direction of the rotor 10 (clockwise when viewed from above the rotor 10 in this embodiment) are provided at the end on the hub 40 side. At the same time, the circular main plate 39 and the plurality (for example, five) blade portions 41 projecting from the hub 40 to one side in the axial direction are integrally formed at a position where the insertion holes 38 do not overlap each other when viewed from the axial direction. Have.

また前記羽根車本体３５には、前記挿通孔３８の軸線方向での前記円形主板３９および前記ハブ４０への前記羽根部４１の投影を含む形状の切り抜き孔４２が、前記羽根部４１に個別に対応して形成される。 Further, in the impeller body 35, a cutout hole 42 having a shape including the projection of the blade portion 41 on the circular main plate 39 and the hub 40 in the axial direction of the insertion hole 38 is individually provided in the blade portion 41. Correspondingly formed.

前記補間部材３６は、前記羽根車本体３５の前記切り抜き孔４２を埋めて前記円形主板３９、前記ハブ４０および前記羽根部４１の表面に滑らかに連なる補間部４４を有するものであり、前記円形主板３９に前記挿通孔３８の軸線方向他側から当接する円形補助板４３と、当該円形補助板４３から突出する前記補間部４４とを一体に有し、前記円形補助板４３は、前記円形主板３９と同径に形成される。 The interpolation member 36 has an interpolation portion 44 that fills the cutout hole 42 of the impeller body 35 and is smoothly connected to the surfaces of the circular main plate 39, the hub 40, and the blade portion 41, and the circular main plate. The circular auxiliary plate 43 that comes into contact with the insertion hole 38 from the other side in the axial direction and the interpolation portion 44 that protrudes from the circular auxiliary plate 43 are integrally provided, and the circular auxiliary plate 43 is the circular main plate 39. Is formed to have the same diameter as.

また前記補間部４４は、前記切り抜き孔４２のうち前記円形主板３９に対応する部位を埋める主板補間部分４４ａと、前記切り抜き孔４２のうち前記ハブ４０に対応する部分を埋めるハブ補間部分４４ｂとを有する。 Further, the interpolation unit 44 includes a main plate interpolation portion 44a that fills a portion of the cutout hole 42 that corresponds to the circular main plate 39, and a hub interpolation portion 44b that fills the portion of the cutout hole 42 that corresponds to the hub 40. Have.

前記前面プレート３７は、前記羽根車本体３５における複数の前記羽根部４１の前記捩じり部分４１ａを除く部分に前記補間部材３６とは反対側から当接するものであり、環状板部４５と、その環状板部４５の内周に連なって前記羽根車本体３５とは反対側にわずかに突出する短円筒部４６とを一体に有する。前記短円筒部４６と、前記羽根車本体３５の前記ハブ４０に挿通される前記延出筒部２４ｂのうち前記ハブ４０からの突出部および前記ハブ４０との間には、前記ケーシング７の前記吸入口１２に通じる環状の入口部４７（図１参照）が形成される。 The front plate 37 abuts on the portions of the impeller body 35 other than the twisted portions 41a of the plurality of blade portions 41 from the side opposite to the interpolation member 36, and the annular plate portion 45 and the annular plate portion 45. It integrally has a short cylindrical portion 46 that is connected to the inner circumference of the annular plate portion 45 and slightly projects to the side opposite to the impeller body 35. The casing 7 is located between the short cylindrical portion 46 and the extension cylinder portion 24b inserted into the hub 40 of the impeller body 35, which protrudes from the hub 40 and the hub 40. An annular inlet 47 (see FIG. 1) leading to the suction port 12 is formed.

前記羽根車本体３５の前記円形主板３９および複数の前記羽根部４１には、前記円形主板３９の外周寄りに配置されて当該円形主板３９の外周に開口する切欠き部５０が形成され、前記補間部材３６の前記円形補助板４３には、前記切欠き部５０を埋めつつ前記前面プレート３７側に突出する複数の溶着ボス部５１が、前記前面プレート３７への溶着を可能として一体に突設される。これらの溶着ボス部５１は、前記補間部材３６の外周すなわち前記円形補助板４３の外周に面一に連なる外端面５１ａを有しつつ前記切欠き部５０を埋めた状態では前記羽根部４１に滑らかに連なる湾曲形状に形成される。 The circular main plate 39 and the plurality of blade portions 41 of the impeller body 35 are formed with notches 50 arranged near the outer periphery of the circular main plate 39 and open to the outer periphery of the circular main plate 39, and the interpolation is performed. A plurality of welding boss portions 51 projecting toward the front plate 37 while filling the notch 50 are integrally projected from the circular auxiliary plate 43 of the member 36 so as to enable welding to the front plate 37. To. These welded boss portions 51 have an outer end surface 51a that is flush with the outer circumference of the interpolation member 36, that is, the outer circumference of the circular auxiliary plate 43, and are smooth on the blade portion 41 when the notch portion 50 is filled. It is formed in a curved shape that is continuous with.

また前記溶着ボス部５１の前記外端面５１ａから内方に離隔した位置で当該溶着ボス部５１の先端部には突部５２が一体に突設されており、前記突部５２は、前記溶着ボス部５１の前記前面プレート３７への溶着前の縦断面形状を三角形状として前記溶着ボス部５１の先端部から突出する。 Further, a protrusion 52 is integrally projected from the tip of the welding boss 51 at a position separated inward from the outer end surface 51a of the welding boss 51, and the protrusion 52 is formed by the welding boss. The vertical cross-sectional shape of the portion 51 before welding to the front plate 37 is formed into a triangular shape and protrudes from the tip portion of the welding boss portion 51.

一方、前記前面プレート３７の環状板部４５には、図４で明示するように、前記溶着ボス部５１の先端部をそれぞれ緩く嵌合させる複数個（この実施の形態では５個）の凹部５３が形成され、前記溶着ボス部５１の先端部は、図５で示すように、前記凹部５３に溶着される。 On the other hand, as shown in FIG. 4, a plurality of recesses 53 (five in this embodiment) in which the tip portions of the welding boss portions 51 are loosely fitted to the annular plate portion 45 of the front plate 37 are loosely fitted. Is formed, and the tip of the welding boss portion 51 is welded to the recess 53 as shown in FIG.

前記突部５２の溶着前の前記凹部５３の閉塞端部には、少なくとも前記突部５２を溶着させるための溶着面５４と、前記前面プレート３７の周方向で前記溶着面５４の両側に配置される逃がし溝５５とが形成され、前記逃がし溝５５の前記前面プレート３７の外周側の端部は、当該前面プレート３７の外周から内方に間隔をあけた位置に設定される。 At the closed end of the recess 53 before welding of the protrusion 52, at least a welding surface 54 for welding the protrusion 52 and a welding surface 54 are arranged on both sides of the welding surface 54 in the circumferential direction of the front plate 37. A relief groove 55 is formed, and the end portion of the relief groove 55 on the outer peripheral side of the front plate 37 is set at a position spaced inward from the outer circumference of the front plate 37.

ところで前記溶着ボス部５１の前記凹部５３への溶着時には、縦断面形状を三角形状とした前記突部５２の頂点部位から加熱溶融されつつ前記溶着面５４に圧し当てられ、これにより前記突部５２は前記溶着面５４と溶け合いつつ圧し延ばされて前記前面プレート３７の前記環状板部４５と一体化される。 By the way, when the welding boss portion 51 is welded to the recess 53, it is pressed against the welding surface 54 while being heated and melted from the apex portion of the protrusion 52 having a triangular vertical cross-sectional shape, whereby the protrusion 52 is pressed. Is stretched while being melted with the welded surface 54 and integrated with the annular plate portion 45 of the front plate 37.

しかも前記補間部材４４は、金型の樹脂射出位置が前記突部５２に配置されて射出成形されるものであり、それにより補間部材４４を形成する樹脂がガラス繊維を含有するＰＰＳ樹脂であるときに、突部５２でのガラス繊維含有量を低下させ、突部５２を溶け易くして溶着を容易とすることができる。 Moreover, when the interpolation member 44 is injection-molded with the resin injection position of the mold arranged at the protrusion 52, and the resin forming the interpolation member 44 is a PPS resin containing glass fiber. In addition, the glass fiber content at the protrusion 52 can be reduced to facilitate melting of the protrusion 52 and facilitate welding.

このような遠心羽根車９を製作するにあたっては、前記切欠き部５０を有する前記羽根車本体３５、前記凹部５３を有する前記前面プレート３７ならびに先端部に前記突部５２が設けられた前記溶着ボス部５１を有する前記補間部材３６をそれぞれ射出成形する工程の後に、前記溶着ボス部５１を前記凹部５３に緩く嵌合して前記突部５２を前記凹部５３の閉塞端部に当接させつつ前記羽根車本体３５、前記前面プレート３７および前記補間部材３６を重ね合わせた状態で少なくとも前記突部５２を加熱溶融して前記溶着ボス部５１を前記凹部５３に溶着すればよい。 In manufacturing such a centrifugal impeller 9, the impeller body 35 having the notch 50, the front plate 37 having the recess 53, and the welding boss provided with the protrusion 52 at the tip. After the step of injection molding the interpolating member 36 having the portion 51, the welding boss portion 51 is loosely fitted into the recess 53, and the protrusion 52 is brought into contact with the closed end portion of the recess 53. At least the protrusion 52 may be heated and melted in a state where the impeller body 35, the front plate 37, and the interpolation member 36 are overlapped, and the welding boss portion 51 may be welded to the recess 53.

次にこの実施の形態の作用について説明すると、挿通孔３８を中央部に有する円形主板３９と、略截頭円錐形状の外面を有しつつ前記挿通孔３８に同軸に連なる筒状に形成されて前記円形主板３９から前記挿通孔３８の軸方向一側に突出するハブ４０と、捩じり上げられた捩じり部分４１ａを前記ハブ４０側の端部に有しつつ前記挿通孔３８の軸線方向から見て相互に重なり合うのを避ける位置で前記円形主板３９および前記ハブ４０から前記軸方向一側に突出する複数の羽根部４１とが樹脂製の羽根車本体３５に一体に設けられ、その羽根車本体３５に、前記挿通孔３８の軸線方向での前記羽根部４１の投影を含む形状の切り抜き孔４２が形成され、当該切り抜き孔４２を埋めて前記円形主板３９、前記ハブ４０および前記羽根部４１の表面に滑らかに連なる補間部４４を有する樹脂製の補間部材３６が、前記羽根車本体３５に前記挿通孔３８の軸線方向他側から当接される。 Next, the operation of this embodiment will be described. The circular main plate 39 having the insertion hole 38 in the center and the tubular shape having a substantially conical outer surface and coaxially connected to the insertion hole 38 are formed. The axis of the insertion hole 38 while having a hub 40 projecting from the circular main plate 39 on one side in the axial direction of the insertion hole 38 and a twisted portion 41a twisted up at the end on the hub 40 side. The circular main plate 39 and a plurality of blade portions 41 projecting from the hub 40 to one side in the axial direction are integrally provided on the resin impeller body 35 at positions where they do not overlap each other when viewed from the direction. A cutout hole 42 having a shape including a projection of the blade portion 41 in the axial direction of the insertion hole 38 is formed in the impeller body 35, and the cutout hole 42 is filled to fill the circular main plate 39, the hub 40, and the blade. A resin-made interpolation member 36 having an interpolation portion 44 smoothly connected to the surface of the portion 41 is brought into contact with the impeller body 35 from the other side in the axial direction of the insertion hole 38.

したがって羽根部４１が捩じり部分４１ａを有した三次元形状のものであっても樹脂成形時のアンダーカット形状を回避することが可能であり、また切り抜き孔４２が樹脂製の補間部材３６が有する補間部４４で埋められることにより、高効率な三次元形状の羽根部４１を有する遠心羽根車を低コストで薄型に製作することができる。またこのような遠心羽根車を成形する金型装置は、スライドコア、湾曲中子および引き抜き中子等や、それらを動かすための可動機構が不要となることから、製造コストが著しく低減される。しかも可動機構が不要となることで余裕が生じたスペースには複数個のキャビティを設けることができ、いわゆる「多数個取りの樹脂成形金型」を使用して遠心羽根車の部品を一挙に大量に製作することができることから、低コストで三次元形状の遠心羽根車を製作することができる。 Therefore, even if the blade portion 41 has a three-dimensional shape having a twisted portion 41a, it is possible to avoid the undercut shape at the time of resin molding, and the interpolation member 36 whose cutout hole 42 is made of resin By being filled with the interpolating portion 44 having, a centrifugal impeller having a highly efficient three-dimensionally shaped blade portion 41 can be manufactured thinly at low cost. Further, the mold device for forming such a centrifugal impeller does not require a slide core, a curved core, a drawing core, or a movable mechanism for moving them, so that the manufacturing cost is significantly reduced. Moreover, multiple cavities can be provided in the space where a movable mechanism is not required, and a large number of centrifugal impeller parts can be installed at once using a so-called "many-piece resin molding die". Since it can be manufactured in the above, it is possible to manufacture a three-dimensional centrifugal impeller at low cost.

また前記円形主板３９および複数の前記羽根部４１に、前記円形主板３９の外周寄りに配置されて当該円形主板３９の外周に開口する切欠き部５０が形成され、前記切欠き部５０を埋めつつ前記前面プレート３７側に突出する複数の溶着ボス部５１が、前記補間部材３６の外周に連なる外端面５１ａを有しつつ当該補間部材３６に一体に突設され、前記溶着ボス部５１の先端部をそれぞれ緩く嵌合させる凹部５３が前記前面プレート３７に形成され、前記溶着ボス部５１の先端部が前記凹部５３に溶着されるので、前記補間部材３６が、前記羽根車本体３５および前記前面プレート３７に一挙に連結、固定されることになり、これにより三次元形状の遠心羽根車を容易に製作することができる。しかも前記溶着ボス部５１が、前記前面プレート３７の外周により近い位置で前記前面プレート３７の前記凹部５３に緩く嵌合された状態で溶着されることになり、溶着時のガス抜け性を高めて溶着不良が生じないようにすることができる。 Further, in the circular main plate 39 and the plurality of blade portions 41, a notch portion 50 arranged near the outer periphery of the circular main plate 39 and opening to the outer periphery of the circular main plate 39 is formed, and the notch portion 50 is filled. A plurality of welding boss portions 51 projecting toward the front plate 37 side are integrally projected from the interpolation member 36 while having an outer end surface 51a connected to the outer periphery of the interpolation member 36, and the tip portion of the welding boss portion 51. A recess 53 is formed in the front plate 37 to loosely fit each of the above, and the tip of the welding boss portion 51 is welded to the recess 53. Therefore, the interpolation member 36 can be used in the impeller body 35 and the front plate. It will be connected and fixed to 37 at once, which makes it possible to easily manufacture a three-dimensionally shaped centrifugal impeller. Moreover, the welding boss portion 51 is welded in a state of being loosely fitted to the recess 53 of the front plate 37 at a position closer to the outer circumference of the front plate 37, thereby improving the gas release property at the time of welding. It is possible to prevent poor welding from occurring.

また前記溶着ボス部５１の前記外端面５１ａから内方に離隔した位置で当該溶着ボス部５１の先端部に、当該溶着ボス部５１の前記凹部５３への溶着前には縦断面三角形状である突部５２が一体に突設されるので、溶着時に前記溶着ボス部５１の先端部の前記突部５２を溶け易くしつつ、溶けた樹脂が遠心羽根車の外周側にはみ出すことを抑制することができ、溶着工程後に、たとえばショットブラスト加工等のバリ取り仕上げを施すことが不要となる。 Further, the welded boss portion 51 has a triangular vertical cross section before being welded to the tip portion of the welded boss portion 51 at a position separated inward from the outer end surface 51a of the welded boss portion 51 to the recess 53. Since the protrusions 52 are integrally projected, the protrusions 52 at the tip of the welding boss 51 can be easily melted at the time of welding, and the melted resin can be prevented from protruding to the outer peripheral side of the centrifugal impeller. It is not necessary to perform deburring finish such as shot blasting after the welding process.

また前記突部５２の溶着前の前記凹部５３の閉塞端部に、少なくとも前記突部５２を溶着させるための溶着面５４と、前記前面プレート３７の周方向で前記溶着面５４の両側に配置される逃がし溝５５とが形成されるので、溶着時に生じたガスを前記前面プレート３７の外周側に逃がしつつ溶着時に溶けた樹脂が遠心羽根車の外周にはみ出すことを防止して、バリ取り仕上げを施すことを不要とすることができる。 Further, at least a welding surface 54 for welding the protrusion 52 and a welding surface 54 for welding the protrusion 52 to the closed end of the recess 53 before welding of the protrusion 52 are arranged on both sides of the welding surface 54 in the circumferential direction of the front plate 37. Since the relief groove 55 is formed, the gas generated during welding is released to the outer peripheral side of the front plate 37, and the resin melted during welding is prevented from squeezing out to the outer periphery of the centrifugal impeller, resulting in a deburring finish. It can be unnecessary to apply.

しかも前記逃がし溝５５の前記前面プレート３７の外周側の端部が、当該前面プレート３７の外周から内方に間隔をあけた位置に設定されるので、逃がし溝５５が前面プレート３７の外周に開口することがなく、樹脂が溶けた際に生じるガスを逃がし溝５５から前面プレート３７の外周側に逃がして溶着不良が生じることを防止しつつ、溶けた樹脂を前記逃がし溝５５側に溜めることで、溶着時に溶けた樹脂が遠心羽根車の外周側にはみ出すことをより確実に防止して、バリ取り仕上げを施すことを不要とすることができる。 Moreover, since the end portion of the relief groove 55 on the outer peripheral side of the front plate 37 is set at a position spaced inward from the outer circumference of the front plate 37, the relief groove 55 opens on the outer periphery of the front plate 37. By accumulating the melted resin on the relief groove 55 side while preventing the gas generated when the resin is melted from the escape groove 55 to the outer peripheral side of the front plate 37 and causing poor welding. It is possible to more reliably prevent the resin melted at the time of welding from squeezing out to the outer peripheral side of the centrifugal impeller, and to eliminate the need for deburring finish.

さらに遠心羽根車９を製作するにあたっては、前記切欠き部５０を有する前記羽根車本体３５、前記凹部５３を有する前記前面プレート３７ならびに先端部に前記突部５２が設けられた前記溶着ボス部５１を有する前記補間部材３６をそれぞれ射出成形する工程と、前記溶着ボス部５１を前記凹部５３に緩く嵌合して前記突部５２を前記凹部５３の閉塞端部に当接させつつ前記羽根車本体３５、前記前面プレート３７および前記補間部材３６を重ね合わせた状態で少なくとも前記突部５２を加熱溶融して前記溶着ボス部５１を前記凹部５３に溶着する工程とを、この順に実行するので、溶着時に溶けた樹脂が遠心羽根車の外周にはみ出すことを防止しつつ、前記補間部材３６と、前記羽根車本体３５および前記前面プレート３７とを一挙に連結、固定することができ、これにより製作工程を簡易化するとともに、高効率な三次元形状の羽根部４１を有する遠心羽根車を低コストで薄型に製作することができる。。 Further, in manufacturing the centrifugal impeller 9, the impeller body 35 having the notch 50, the front plate 37 having the recess 53, and the welding boss portion 51 provided with the protrusion 52 at the tip. The impeller main body while loosely fitting the welding boss portion 51 into the recess 53 and bringing the protrusion 52 into contact with the closed end portion of the recess 53. 35, the step of heating and melting at least the protrusion 52 in a state where the front plate 37 and the interpolation member 36 are overlapped and welding the welding boss 51 to the recess 53 is performed in this order. While preventing the sometimes melted resin from protruding to the outer periphery of the centrifugal impeller, the interpolation member 36, the impeller body 35, and the front plate 37 can be connected and fixed at once, whereby the manufacturing process can be performed. It is possible to manufacture a centrifugal impeller having a highly efficient three-dimensionally shaped blade portion 41 at low cost and thinly. ..

以上、本発明の実施の形態について説明したが、本発明は上記実施の形態に限定されるものではなく、特許請求の範囲に記載された本発明を逸脱することなく種々の設計変更を行うことが可能である。 Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various design changes are made without departing from the present invention described in the claims. Is possible.

８・・・支軸
９・・・遠心羽根車
３５・・・羽根車本体
３６・・・補間部材
３７・・・前面プレート
３８・・・挿通孔
３９・・・円形主板
４０・・・ハブ
４１・・・羽根部
４１ａ・・・捩じり部分
４２・・・切り抜き孔
４４・・・補間部
５０・・・切欠き部
５１・・・溶着ボス部
５１ａ・・・溶着ボス部の外端面
５２・・・突部
５３・・・凹部
５４・・・溶着面
５５・・・逃がし溝 8 ... Support shaft 9 ... Centrifugal impeller 35 ... Impeller body 36 ... Interpolation member 37 ... Front plate 38 ... Insertion hole 39 ... Circular main plate 40 ... Hub 41 ... Blade portion 41a ... Twisted portion 42 ... Cutout hole 44 ... Interpolation portion 50 ... Notch portion 51 ... Welding boss portion 51a ... Outer end surface 52 of the welding boss portion ... Protrusion 53 ... Recess 54 ... Welding surface 55 ... Relief groove

Claims (5)

支軸（８）が挿通される挿通孔（３８）を中央部に有する円形主板（３９）と、略截頭円錐形状の外面を有しつつ前記挿通孔（３８）に同軸に連なる筒状に形成されて前記円形主板（３９）から前記挿通孔（３８）の軸方向一側に突出するハブ（４０）と、捩じり上げられた捩じり部分（４１ａ）を前記ハブ（４０）側の端部に有しつつ前記挿通孔（３８）の軸線方向から見て相互に重なり合うのを避ける位置で前記円形主板（３９）および前記ハブ（４０）から前記軸方向一側に突出する複数の羽根部（４１）とを備える遠心羽根車において、前記円形主板（３９）、前記ハブ（４０）および前記羽根部（４１）が樹脂製の羽根車本体（３５）に一体に設けられ、前記羽根車本体（３５）に、前記挿通孔（３８）の軸線方向での前記羽根部（４１）の投影を含む形状の切り抜き孔（４２）が形成され、当該切り抜き孔（４２）を埋めて前記円形主板（３９）、前記ハブ（４０）および前記羽根部（４１）の表面に滑らかに連なる補間部（４４）を有する樹脂製の補間部材（３６）が、前記羽根車本体（３５）に前記挿通孔（３８）の軸線方向他側から当接され、複数の前記羽根部（４１）に前記補間部材（３６）とは反対側から樹脂製の前面プレート（３７）が当接され、前記円形主板（３９）および複数の前記羽根部（４１）に、前記円形主板（３９）の外周寄りに配置されて当該円形主板（３９）の外周に開口する切欠き部（５０）が形成され、前記切欠き部（５０）を埋めつつ前記前面プレート（３７）側に突出する複数の溶着ボス部（５１）が、前記補間部材（３６）の外周に連なる外端面（５１ａ）を有しつつ当該補間部材（３６）に一体に突設され、前記複数の溶着ボス部（５１）の先端部をそれぞれ緩く嵌合させる複数の凹部（５３）が前記前面プレート（３７）に形成され、前記溶着ボス部（５１）の先端部が前記凹部（５３）に溶着されることを特徴とする遠心羽根車。 A circular main plate (39) having an insertion hole (38) through which the support shaft (8) is inserted in the center, and a tubular shape coaxially connected to the insertion hole (38) while having a substantially head-shaped conical outer surface. A hub (40) formed and projecting from the circular main plate (39) to one side of the insertion hole (38) in the axial direction, and a twisted portion (41a) twisted up on the hub (40) side. A plurality of protrusions from the circular main plate (39) and the hub (40) in the axial direction at positions that are held at the ends of the insertion holes (38) and avoid overlapping with each other when viewed from the axial direction of the insertion holes (38). In a centrifugal impeller including a blade portion (41), the circular main plate (39), the hub (40), and the blade portion (41) are integrally provided on a resin impeller body (35), and the blades are provided. A cutout hole (42) having a shape including a projection of the blade portion (41) in the axial direction of the insertion hole (38) is formed in the vehicle body (35), and the cutout hole (42) is filled with the circular shape. A resin interpolation member (36) having an interpolation portion (44) smoothly connected to the surfaces of the main plate (39), the hub (40), and the blade portion (41) is inserted into the impeller body (35). The hole (38) is abutted from the other side in the axial direction, and the resin front plate (37) is abutted against the plurality of blade portions (41) from the side opposite to the interpolation member (36), and the circular main plate is abutted. (39) and the plurality of blade portions (41) are formed with cutout portions (50) arranged near the outer periphery of the circular main plate (39) and open to the outer periphery of the circular main plate (39). A plurality of welding boss portions (51) projecting toward the front plate (37) side while filling the notch portion (50) have an outer end surface (51a) connected to the outer periphery of the interpolation member (36) and the interpolation member. A plurality of recesses (53) are formed in the front plate (37) so as to project integrally with (36) and loosely fit the tip portions of the plurality of welding boss portions (51), respectively, and the welding boss portion (37) is formed. A centrifugal impeller, characterized in that the tip end portion of 51) is welded to the recess (53). 前記溶着ボス部（５１）の前記外端面（５１ａ）から内方に離隔した位置で当該溶着ボス部（５１）の先端部に、当該溶着ボス部（５１）の前記凹部（５３）への溶着前には縦断面三角形状である突部（５２）が、一体に突設されることを特徴とする請求項１に記載の遠心羽根車。 Welding of the welding boss (51) to the recess (53) of the welding boss (51) at the tip of the welding boss (51) at a position separated inward from the outer end surface (51a) of the welding boss (51). The centrifugal impeller according to claim 1, wherein a protrusion (52) having a triangular vertical cross section is integrally provided in front of the protrusion. 前記突部（５２）の溶着前の前記凹部（５３）の閉塞端部に、少なくとも前記突部（５２）を溶着させるための溶着面（５４）と、前記前面プレート（３７）の周方向で前記溶着面（５４）の両側に配置される逃がし溝（５５）とが形成されることを特徴とする請求項２に記載の遠心羽根車。 At least on the welded surface (54) for welding the protrusion (52) to the closed end of the recess (53) before welding of the protrusion (52), and in the circumferential direction of the front plate (37). The centrifugal impeller according to claim 2, wherein relief grooves (55) arranged on both sides of the welded surface (54) are formed. 前記逃がし溝（５３）の前記前面プレート（３７）の外周側の端部が、当該前面プレート（３７）の外周から内方に間隔をあけた位置に設定されることを特徴とする請求項３に記載の遠心羽根車。 3. A third aspect of the present invention, wherein the end portion of the relief groove (53) on the outer peripheral side of the front plate (37) is set at a position spaced inward from the outer circumference of the front plate (37). The centrifugal impeller described in. 請求項４に記載の遠心羽根車を製造するための遠心羽根車の製造方法において、前記切欠き部（５０）を有する前記羽根車本体（３５）、前記凹部（５３）を有する前記前面プレート（３７）ならびに先端部に前記突部（５２）が設けられた前記溶着ボス部（５１）を有する前記補間部材（３６）をそれぞれ射出成形する工程と；前記溶着ボス部（５１）を前記凹部（５３）に緩く嵌合して前記突部（５２）を前記凹部（５３）の閉塞端部に当接させつつ前記羽根車本体（３５）、前記前面プレート（３７）および前記補間部材（３６）を重ね合わせた状態で少なくとも前記突部（５２）を加熱溶融して前記溶着ボス部（５１）を前記凹部（５３）に溶着する工程と；をこの順に実行することを特徴とする遠心羽根車の製造方法。 In the method for manufacturing a centrifugal impeller for manufacturing a centrifugal impeller according to claim 4, the impeller body (35) having the notch (50) and the front plate (53) having the recess (53). 37) and the step of injection molding the interpolation member (36) having the welding boss portion (51) provided with the protrusion (52) at the tip portion; the welding boss portion (51) is formed into the recess (51). The impeller body (35), the front plate (37), and the interpolating member (36) are loosely fitted into the impeller body (35) and brought into contact with the closed end of the recess (53). The centrifugal impeller is characterized in that at least the protrusion (52) is heated and melted and the welding boss portion (51) is welded to the recess (53) in this order. Manufacturing method.

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