JP2011122457A - Closed impeller - Google Patents

Closed impeller Download PDF

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JP2011122457A
JP2011122457A JP2009278156A JP2009278156A JP2011122457A JP 2011122457 A JP2011122457 A JP 2011122457A JP 2009278156 A JP2009278156 A JP 2009278156A JP 2009278156 A JP2009278156 A JP 2009278156A JP 2011122457 A JP2011122457 A JP 2011122457A
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blade
front plate
blade tip
bulging
conical
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JP5534792B2 (en
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Ryohei Adachi
良平 安達
Hi So
飛 宋
Hisayoshi Ono
尚由 小野
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Yamada Manufacturing Co Ltd
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Yamada Seisakusho KK
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Abstract

<P>PROBLEM TO BE SOLVED: To secure strength with a simple structure and prevent drop of efficiency without blocking flow of fluid in an impeller. <P>SOLUTION: This impeller includes a truncated cone-shaped front plate 1 and a plurality of blades 2 having one end surfaces of unit blade plates 21 extending in radial directions formed as blade tip surfaces 21a. The blades 2 and the front plate 1 are made of synthetic resin material containing glass fiber and the like. Resin surface temperature is raised by keeping surfaces 1b thereof and the blade tip surfaces 21a in contact and giving energy from an outside under appropriate pressure. A welding part 50 is formed out of molten resin of the surfaces 1b and the blade tip surfaces 21a thereby. The welding part 50 is formed with lower content of glass fiber and the like than base material, and a bulge welding part p where the same bulges to blade 2 side surfaces is formed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、ガラス繊維等が含有する合成樹脂材の羽根及びフロントプレートから成るクローズドインペラに関する。   The present invention relates to a closed impeller including a synthetic resin blade and a front plate contained in glass fiber or the like.

合成樹脂製の羽根と側板に超音波を与えて加熱軟化させ、軟化した材料を羽根部側端面と後面シュラウド側面間に介在させて一体に溶着することが特許文献1(特開昭53−54301号)に開示されている。羽根の根元とベースとなる後面シュラウドとの溶着部は、強度を確保する必要があるため、溶着部を構成する軟化した軟化材料も多くなって厚肉化し、且つ、はみ出しが大きくなることから、前記はみ出し内には多くの軟化材料(溶融樹脂)と共にガラス繊維が流動することになって、そのはみ出しは強く硬いものとなる。その結果、はみ出しの加工や除去することが困難であった。   Patent Document 1 (Japanese Patent Laid-Open No. 53-54301) discloses that synthetic resin blades and side plates are heated and softened by applying ultrasonic waves, and the softened material is interposed between the blade portion side end surface and the rear shroud side surface and is integrally welded. No.). Because the welded portion between the blade base and the rear shroud serving as the base needs to ensure strength, the softened softening material that forms the welded portion also increases in thickness, and the protrusion increases. Glass fiber flows with a lot of softening material (molten resin) in the protrusion, and the protrusion becomes strong and hard. As a result, it was difficult to process or remove the protrusion.

そのようなことから、大きなはみ出しがそのまま残ることになって、インペラ下面の流路の平滑さを損ないインペラ内の流動抵抗が大きくなり、効率を低下させる不具合があった。また、前記はみ出しを小さくしようと羽根部と後面シュラウド間に介在される軟化材料の厚さを変化させる押圧力、超音波の強さの条件を規制しようとしても、これらを厳格に規制することは困難であり、工程管理が面倒となって量産することが難しいという不具合があった。その不具合を解消するために、羽根と後面シュラウドの溶着部面に溝等を形成して、羽根部に側端縁からはみ出しが形成されないようにしたものが特許文献1(特開昭53−54301号)に開示されている。   For this reason, there is a problem that a large protrusion remains as it is, the smoothness of the flow path on the lower surface of the impeller is impaired, the flow resistance in the impeller is increased, and the efficiency is lowered. Moreover, even if it is going to regulate the conditions of the pressing force and the ultrasonic strength that change the thickness of the softening material interposed between the blade part and the rear shroud so as to reduce the protrusion, these are strictly regulated. There is a problem that it is difficult and mass production is difficult due to troublesome process management. In order to solve this problem, Patent Document 1 (Japanese Patent Laid-Open No. 53-54301) is provided with a groove or the like formed on the welded portion surface of the blade and the rear shroud so that the blade portion does not protrude from the side edge. No.).

しかし、溶着時に溝との位置あわせ、溝の挿入などの工程管理が面倒となる不具合が生ずる。このようなことから複雑な工程管理を必要としない平面同士によって溶着部を形成し、インペラの効率を低下させないという課題を解決することが困難であった。言い換えると、羽根とシュラウドとを超音波等によって溶着部の強度を確保しつつ、且つ工程管理が面倒になることなく容易な構造でインペラの効率を低下させないクローズドインペラ(構造)とすることは困難であった。   However, there is a problem that process management such as alignment with the groove and insertion of the groove becomes troublesome at the time of welding. For this reason, it has been difficult to solve the problem that the welded portion is formed by planes that do not require complicated process management and the impeller efficiency is not lowered. In other words, it is difficult to make the blade and shroud a closed impeller (structure) that ensures the strength of the welded portion by ultrasonic waves and the like, and does not reduce the efficiency of the impeller with an easy structure without troublesome process control. Met.

特開昭53−54301号JP-A-53-54301

このため、本発明が解決しようとする課題(技術的課題又は目的等)は、簡易な構造であって強度が確保され、且つ、インペラ内の流体の流れを阻害することなく、効率を低下させないクローズドインペラを提供することである。   For this reason, the problem (technical problem or purpose) to be solved by the present invention is a simple structure, the strength is ensured, and the flow of the fluid in the impeller is not hindered and the efficiency is not lowered. To provide a closed impeller.

そこで、発明者は上記課題を解決すべく鋭意,研究を重ねた結果、請求項1の発明を、裁頭円錐状のフロントプレートと、複数放射方向に延びる単位羽根板の一端面を羽根先端面として形成した羽根とを備え、該羽根及び前記フロントプレートはガラス繊維等が含有する合成樹脂材からなり、前記フロントプレートの表面と前記羽根先端面とが接触されて適宜な加圧下で外部からエネルギーを与えることにより樹脂表面温度を上昇させることで、前記フロントプレート表面と前記羽根の羽根先端面との溶融樹脂によって溶着部が形成され、該溶着部は前記羽根及び前記フロントプレートよりガラス繊維等の含有量が少なくなって形成され、該ガラス繊維等の含有量が少ない溶着部から前記羽根側面に膨出した膨出溶着部が形成され、該膨出溶着部の表面に前記円錐状のフロントプレート及び前記羽根先端面の円錐状傾斜方向且つ羽根放射方向に沿って滑らかな連続表面が形成されてなることを特徴とするクローズドインペラとしたことにより、前記課題を解決した。   In view of the above, the inventor has intensively and intensively studied to solve the above-described problems. As a result, the invention according to claim 1 is changed from the front face of the truncated cone and one end face of the unit blade extending in a plurality of radial directions to the blade tip face. The blade and the front plate are made of a synthetic resin material containing glass fiber or the like, and the surface of the front plate and the blade tip surface are brought into contact with each other to generate energy from the outside under appropriate pressure. By increasing the surface temperature of the resin by providing a weld portion is formed by the molten resin between the front plate surface and the blade tip surface of the blade, and the weld portion is made of glass fiber or the like from the blade and the front plate. A bulging weld portion bulging from the welding portion having a low content of glass fiber or the like to the blade side surface is formed, and the bulging melt is formed. The closed impeller is characterized in that a smooth continuous surface is formed on the surface of the conical front plate and the conical inclined direction of the blade tip surface and the blade radial direction. Solved.

請求項2の発明を、請求項1において前記膨出溶着部の表面は、ショットブラストにより前記円錐状のフロントプレート及び前記羽根先端面の円錐状傾斜方向且つ羽根放射方向に沿って滑らかな連続表面が形成されてなることを特徴とするクローズドインペラとしたことにより、前記課題を解決した。請求項3の発明を、請求項1において、前記羽根先端面の幅方向の側縁部に溜り用欠肉部が形成されてなることを特徴とするクローズドインペラとしたことにより、前記課題を解決した。   According to a second aspect of the present invention, in the first aspect, the surface of the bulging weld portion is a continuous surface that is smooth along the conical inclined direction of the conical front plate and the blade tip surface and the blade radial direction by shot blasting. The above-mentioned problem has been solved by using a closed impeller characterized in that is formed. According to a third aspect of the present invention, there is provided a closed impeller according to the first aspect, wherein a pooled impeller portion is formed at a side edge portion in the width direction of the blade tip surface, thereby solving the above-mentioned problem. did.

請求項1の発明において、フロントプレートと羽根とからなるクローズドインペラを簡単な構造で製造することができ、且つ、フロントプレートと羽根先端とを簡単に溶着して製造することができる。特に、振動溶着の一つである超音波溶着法などにて簡単に製造できる。また、容易に相互部材の接合部を溶融して固着可能にすると共に該相互部材間の接合部に隙間が生じることなく密着状態となる構造によりクローズドインペラ内流路における接合部の密閉性が確保されるのでインペラ効率を向上させることができ、且つ、何らの接着剤を使用しないことから環境に優れた構造とすることができる利点がある。さらに、形成されたインペラ内の流路を滑らかな連続表面にすることができることにより効率を低下させないクローズドインペラとすることができる。   In the first aspect of the invention, the closed impeller including the front plate and the blade can be manufactured with a simple structure, and the front plate and the blade tip can be easily welded. In particular, it can be easily manufactured by an ultrasonic welding method which is one of vibration welding. In addition, the joint of the mutual members can be easily melted and fixed, and the tightness of the joint in the flow path in the closed impeller is ensured by the structure in which the joints between the mutual members are in close contact with each other without any gaps. Therefore, the impeller efficiency can be improved, and since no adhesive is used, there is an advantage that a structure excellent in environment can be obtained. Furthermore, since the flow path in the formed impeller can be made into a smooth continuous surface, it can be set as the closed impeller which does not reduce efficiency.

請求項2の発明では、膨出溶着部からのバリ状突起部を簡単に除去できると共に前記円錐状フロントプレート及び前記羽根先端面の円錐状傾斜方向且つ羽根先端の放射方向に沿って滑らかな連続表面を容易に形成することができるので、クローズドインペラ内の流路を良好な状態にすることができる。請求項3の発明では、溜り用欠肉部には膨出溶着部の膨出肉部が溜まり膨出溶着部が羽根面より膨出することが少なくでき、円錐状フロントプレートと羽根先端との溶着部を確保しつつ、羽根面に対して膨出溶着部の連続表面をより滑らかな流路に形成することができる。   According to the second aspect of the present invention, the burr-like projections from the bulging welds can be easily removed, and the conical front plate and the blade tip surface can be smoothly continuous along the cone inclined direction and the blade tip radial direction. Since the surface can be easily formed, the flow path in the closed impeller can be in a good state. In the third aspect of the invention, the bulging weld portion of the bulging weld portion accumulates in the pooled lacking portion so that the bulging weld portion is less likely to bulge from the blade surface, and the conical front plate and the blade tip The continuous surface of the bulging weld part can be formed in a smoother flow path with respect to the blade surface while securing the weld part.

(A)はウォーターポンプのハウジングの壁面と本発明との関係を示す要部断面図、(B)はY1−Y1矢視拡大断面図、(C)は(B)の(ア)部拡大断面図、(D)は(C)の(イ)部の拡大断面図である。(A) is principal part sectional drawing which shows the relationship between the wall surface of the housing of a water pump, and this invention, (B) is Y1-Y1 arrow expanded sectional view, (C) is the (A) expanded sectional view of (B). FIG. 4D is an enlarged cross-sectional view of part (A) of (C). (A)は単位羽根板とフロントプレートとを溶着させる状態の要部断面図、(B)は(A)の(ウ)部拡大断面図、(C)は単位羽根板とフロントプレートとの溶着過程における要部拡大断面図、(D)は単位羽根板とフロントプレートとが溶着完了した要部拡大断面図である。(A) is a cross-sectional view of the main part in a state in which the unit vane plate and the front plate are welded, (B) is an enlarged cross-sectional view of the (C) part of (A), and (C) is a weld of the unit vane plate and the front plate. The principal part expanded sectional view in a process, (D) is the principal part expanded sectional view which the unit blade and the front plate completed welding. (A)はベースプレート付き羽根に溶着完了した断面図、(B)は(A)のX1−X1矢視拡大断面図である。(A) is sectional drawing which completed welding to the blade | wing with a baseplate, (B) is an X1-X1 arrow expanded sectional view of (A). (A)は(C)のベースプレート付き羽根とフロントプレートとを溶着した直後の一部拡大断面図、(B)は(C)のベースプレート付き羽根とフロントプレートとを溶着した直後のY2−Y2矢視拡大断面図、(C)はベースプレート付き羽根とフロントプレートとを溶着した直後のクローズドインペラの断面図、(D)は(C)のクローズドインペラ状態にショットブラスト処理した直後のクローズドインペラの断面図、(E)は(A)の状態と対照的にショットブラスト処理した直後の一部拡大断面図、(F)は(B)の状態と対照的にショットブラスト処理した直後のY3―Y3矢視拡大断面図である。(A) is a partially enlarged cross-sectional view immediately after welding the blade with a base plate and the front plate of (C), and (B) is a Y2-Y2 arrow immediately after welding the blade with the base plate and the front plate of (C). (C) is a cross-sectional view of a closed impeller immediately after welding a blade with a base plate and a front plate, and (D) is a cross-sectional view of a closed impeller immediately after shot blasting in the closed impeller state of (C). , (E) is a partially enlarged cross-sectional view immediately after shot blasting in contrast to the state of (A), and (F) is a view of arrows Y3-Y3 immediately after shot blasting in contrast to the state of (B). It is an expanded sectional view. (A)は単位羽根板の両側に形成された膨出溶着部の張出し部の張出し状態を示す平面図、(B)は(A)の平面図から単位羽根板を直線状(曲線有り)として膨出溶着部の張出し部が模式的に形成された平面図、(C)乃至(E)は単位羽根板を直線状として膨出溶着部の張出し部が模式的に形成された他の張出し状態を示す実施例の平面図である。(A) is a plan view showing the overhanging state of the overhanging portion of the bulging weld portion formed on both sides of the unit blade plate, and (B) is a unit blade plate that is straight (with a curve) from the plan view of (A) The top view in which the overhang part of the bulging weld part is schematically formed, and (C) to (E) are other overhang states in which the overhang part of the bulge weld part is schematically formed with the unit blade plate being linear. It is a top view of the Example which shows these. (A)は単位羽根板の先端に溜り用欠肉部を形成した断面図、(B)は(A)を溶着した直後の断面図、(C)は(B)の状態後にショットブラスト処理した断面図である。(A) is a cross-sectional view in which a pooled hollow portion is formed at the tip of a unit blade, (B) is a cross-sectional view immediately after welding (A), and (C) is shot blasted after the state of (B). It is sectional drawing.

以下、本発明の実施形態について図面に基づいて説明する。1はフロントプレートであって、裁頭円錐状(ラッパ形状)の環状板である。断面的に見ると、軸方向に対して、先端側が窄まる凸をなし、外周に行くほど高さが低くなり、中心に円形孔1aの開いた円(輪)板である。厚みは適宜選択され、0.数mm乃至数mmのもの、例えば、約1乃至2mm内外で、材質は、ガラス繊維等が含有する硬質の合成樹脂材である。第1実施形態では、任意の円錐の頂部を切除した扁平ラッパ形状の環状板なるフロントプレート1である。つまり、第1実施形態では円錐形タイプとして説明する。該フロントプレート1の円錐面の表面1b〔図3(A)において円錐面内側〕の仮想頂点箇所の円錐頂角(立体角ともいう)をφとする〔図3(A)参照〕。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a front plate, which is a truncated conical (trumpet-shaped) annular plate. When viewed from a cross-section, a circular (ring) plate having a convex shape whose front end side is narrowed with respect to the axial direction and having a height lower toward the outer periphery and having a circular hole 1a at the center. The thickness is appropriately selected, and is 0. A material of several mm to several mm, for example, about 1 to 2 mm inside and outside, is a hard synthetic resin material containing glass fiber or the like. In the first embodiment, the front plate 1 is a flat trumpet-shaped annular plate obtained by cutting off the top of an arbitrary cone. That is, the first embodiment will be described as a conical type. A cone apex angle (also referred to as a solid angle) at a virtual apex portion of the conical surface 1b (inside the conical surface in FIG. 3A) of the front plate 1 is defined as φ (see FIG. 3A).

2は羽根であって、該羽根2の根元側に円板なるベースプレート3が一体形成されている。このような部材をベースプレート3付き羽根2と称する。前記羽根2は、筒状のボス部22の外周に複数の単位羽根板21,21,・・の基部が一体形成されている。前記ボス部22は、中心部に貫通孔が形成された金属製のボス部本体22aと、該ボス部本体22aに対して外周側の厚肉部22bから構成されている。該厚肉部22bは、前記単位羽根板21の根元と、前記ベースプレート3の中心部とが一体となるように形成されている。つまり、金属製のボス部本体22aを除く羽根2と前記ベースプレート3とは同一材質のガラス繊維等が含有する硬質の合成樹脂材にて構成されている。該ベースプレート3と前記羽根2は、PPS(ポリフェニレンサルファイド)、PPA(ポリフタルアミド)などの熱可塑性樹脂に、ガラス繊維、炭素繊維などの繊維を含有された合成樹脂材で形成されることが好ましい。   Reference numeral 2 denotes a blade, and a base plate 3 which is a disc is integrally formed on the base side of the blade 2. Such a member is referred to as a blade 2 with a base plate 3. In the blade 2, bases of a plurality of unit blade plates 21, 21,... Are integrally formed on the outer periphery of a cylindrical boss portion 22. The boss portion 22 includes a metal boss portion main body 22a having a through-hole formed in the center portion, and a thick portion 22b on the outer peripheral side with respect to the boss portion main body 22a. The thick portion 22b is formed so that the base of the unit blade plate 21 and the central portion of the base plate 3 are integrated. That is, the blade 2 except the metal boss main body 22a and the base plate 3 are made of a hard synthetic resin material containing glass fibers of the same material. The base plate 3 and the blades 2 are preferably formed of a synthetic resin material in which fibers such as glass fibers and carbon fibers are contained in a thermoplastic resin such as PPS (polyphenylene sulfide) and PPA (polyphthalamide). .

前記単位羽根板21において、前記ベースプレート3の固着側の反対側は〔図3(A)において先端側〕羽根先端面21aとして、前記フロントプレート1の形状に対応した形状であって、円錐面の一部となっている。詳述すると、前記羽根2を構成する複数の単位羽根板21,21,・・の羽根先端面21a,21a,・・は、前記フロントプレート1の表面1bの円錐頂角φと同一の円錐頂角φとなるような円錐面の一部として構成されている。   In the unit blade plate 21, the side opposite to the fixing side of the base plate 3 [tip side in FIG. 3A] is a blade tip surface 21 a corresponding to the shape of the front plate 1 and having a conical surface. It has become a part. More specifically, the blade tip surfaces 21a, 21a,... Of the plurality of unit blade plates 21, 21,... Constituting the blade 2 are conical crests that are the same as the cone apex angle φ of the surface 1b of the front plate 1. It is configured as a part of a conical surface having an angle φ.

さらに、前記フロントプレート1及び単位羽根板21の素材断面としてみると、同一のガラス繊維等が含有する硬質の合成樹脂材でありながら、図1(C)に示すように、それぞれの表層部(約10μm〜数十μm)にはガラス繊維等が存在しない合成樹脂が形成されており、その下側(表層下)には、ガラス繊維等が存在している合成樹脂が存在していることが実験的に判明している。また、前記フロントプレート1及び単位羽根板21も、同一材質でありながら、別々に成形することから、ガラス繊維等が含有する量が若干変化することもあるため、各部を材料部として表示する。   Furthermore, when viewed as the material cross section of the front plate 1 and the unit blade 21, as shown in FIG. 1 (C), each surface layer portion ( A synthetic resin having no glass fiber or the like is formed in about 10 μm to several tens of μm), and a synthetic resin in which glass fiber or the like is present is present on the lower side (under the surface layer). Experimentally known. Further, since the front plate 1 and the unit vane plate 21 are also formed of the same material but are separately formed, the amount contained in the glass fiber or the like may be slightly changed, so that each part is displayed as a material part.

そこで、前記単位羽根板21の表層下のa部は、ガラス繊維が適宜含有された合成樹脂、その表層のb部は、合成樹脂又はガラス繊維等が殆ど無い合成樹脂として構成され、前記フロントプレート1の表層下のc部は、ガラス繊維等が適宜含有された合成樹脂、その表層のd部は、合成樹脂又はガラス繊維等が殆ど無い合成樹脂として構成されている。前記フロントプレート1及び単位羽根板21なる製品において、表層に合成樹脂のみ(ガラス繊維等が存在しない、又は殆ど無い部位)が形成されることは、射出成形の成形型において、溶融樹脂のガラス繊維等は流速の速い中心部を流動し、表層は合成樹脂又はガラス繊維等が殆ど無い合成樹脂の層となる特性がある。特に、図1及び2の拡大断面図において、点、点とした印は、ガラス繊維等を表し、その点が無い前記表層部b,dのところは、合成樹脂又はガラス繊維等が殆ど無い合成樹脂を表している。   Therefore, the a part under the surface layer of the unit blade 21 is configured as a synthetic resin appropriately containing glass fibers, and the b part of the surface layer is configured as a synthetic resin or a synthetic resin almost free of glass fibers, etc. The part c below the surface layer 1 is configured as a synthetic resin appropriately containing glass fibers, and the surface part d is configured as a synthetic resin having almost no synthetic resin or glass fibers. In the product consisting of the front plate 1 and the unit blade 21, only a synthetic resin (a portion in which glass fiber or the like is not present or almost absent) is formed on the surface layer. And the like flow in the central portion where the flow velocity is fast, and the surface layer has a characteristic of becoming a synthetic resin layer having almost no synthetic resin or glass fiber. In particular, in the enlarged cross-sectional views of FIGS. 1 and 2, a point or a mark indicating a point represents a glass fiber or the like, and the surface layer portions b and d having no point have a synthetic resin or a synthetic material having almost no glass fiber or the like. Represents resin.

前記フロントプレート1の表面と前記羽根先端面21aとが接触されて適宜な加圧力が加えられつつ〔図2(A)及び(B)参照〕、温度が上がるようなエネルギーが与えられて、前記フロントプレート1の表面と前記羽根2の羽根先端面21aとが溶着される。この溶着(超音波溶着)について詳述する。前記フロントプレート1の表面と前記羽根先端面21aとが接合する部分に超音波溶着させる場合、まずは前記単位羽根板21の表層部bと、前記フロントプレート1の表層部dとが溶融する。そして、単位羽根板21の表層下部aと、前記フロントプレート1の表層下部cとが溶融する。   While the surface of the front plate 1 and the blade tip surface 21a are in contact with each other and an appropriate pressurizing force is applied (see FIGS. 2A and 2B), energy that increases the temperature is given, The surface of the front plate 1 and the blade tip surface 21a of the blade 2 are welded. This welding (ultrasonic welding) will be described in detail. When ultrasonic welding is performed on a portion where the surface of the front plate 1 and the blade tip surface 21a are joined, first, the surface layer portion b of the unit blade plate 21 and the surface layer portion d of the front plate 1 are melted. Then, the surface layer lower part a of the unit blade 21 and the surface layer lower part c of the front plate 1 are melted.

超音波溶着時に掛かる圧力(押圧力)によって、まずは表層部b,d(合成樹脂、又はガラス繊維等が殆ど無い合成樹脂)が溶融して〔図2(C)参照〕、さらに表層下部a,c(ガラス繊維等が適宜含有された合成樹脂)が溶融して成る溶融樹脂は溶着部50として構成され、両者間の結合材となる。該溶着部50の溶融樹脂において最初に溶融された前記表層部b,d(ガラス繊維等の殆ど無い合成樹脂)は前記単位羽根板21の側面側に流動すると共に、その後、溶融された表層下部a,c(ガラス繊維等が適宜含有された合成樹脂)の流動によって、膨出溶着部Pが形成される。   First, the surface layer portions b and d (synthetic resin or synthetic resin having almost no glass fiber or the like) are melted by the pressure (pressing force) applied at the time of ultrasonic welding (see FIG. 2 (C)), A molten resin obtained by melting c (synthetic resin appropriately containing glass fiber or the like) is formed as a welded portion 50, and serves as a binder between the two. The surface layer portions b and d (synthetic resin having almost no glass fiber or the like) first melted in the molten resin of the welded portion 50 flow to the side surface side of the unit vane plate 21, and then the melted lower portion of the surface layer. The bulging weld P is formed by the flow of a and c (synthetic resin appropriately containing glass fibers and the like).

すなわち、前記溶着部50は、単位羽根板21とフロントプレート1とを結合する溶着部qと単位羽根板21の側面側とフロントプレート1との間に亘る膨出溶着部Pとから成る。そして、該膨出溶着部Pは、合成樹脂部の割合が、表層下部a,c(ガラス繊維等が適宜含有された合成樹脂)と比較して多い状態となっている。つまり、前記膨出溶着部Pは、合成樹脂部に対してのガラス繊維等の割合が少ない状態にある。該膨出溶着部Pは、起伏状等の張出し部Paとバリ状突起部Pbとから構成されている。   That is, the welded portion 50 includes a welded portion q that joins the unit blade plate 21 and the front plate 1, and a bulge welded portion P that extends between the side surface of the unit blade plate 21 and the front plate 1. And the bulging weld part P is in a state in which the ratio of the synthetic resin part is larger than the surface layer lower parts a and c (synthetic resin appropriately containing glass fibers and the like). That is, the bulging weld part P is in a state where the ratio of glass fibers or the like to the synthetic resin part is small. The bulging weld portion P is composed of a bulge-like overhanging portion Pa and a burr-like projection Pb.

以上の説明は、溶融又は溶着について詳述したが、構造について説明する。本発明では、円錐状に傾斜した立体角φを有する羽根先端面21aと円錐状の立体角φを有するフロントプレート1との溶着部から溶融された合成樹脂等が前記単位羽根板21の側面側から膨出されて膨出溶着部Pが形成されている。これは、前記各円錐状面を有する羽根先端面21aと前記フロントプレート1との接合された円錐状面(極緩やかな曲面で、立体角φ)から押し流されて形成される。前記膨出溶着部Pは、前記フロントプレート1と接合した羽根先端面21aの側縁において筋交的に羽根2とフロントプレート1の両部材に接合されている。筋交なるがゆえに、インペラの剛性を高め、強固にできる。   The above description details the melting or welding, but the structure will be described. In the present invention, the synthetic resin or the like melted from the welded portion between the blade tip surface 21 a having a conical solid angle φ and the front plate 1 having a conical solid angle φ is the side surface side of the unit blade plate 21. The bulging welding part P is formed by bulging out from. This is formed by being swept away from a conical surface (an extremely gentle curved surface, solid angle φ) where the blade tip surface 21a having each conical surface and the front plate 1 are joined. The bulging weld part P is joined to both members of the blade 2 and the front plate 1 at the side edge of the blade tip surface 21 a joined to the front plate 1. Because of the bracing, the rigidity of the impeller can be increased and strengthened.

前記膨出溶着部Pは、羽根先端面21aとフロントプレート1との接合された円錐状面の曲面(立体角φ)を流動して張出し部Paとして形成され、更にその表面に薄肉状片のバリ状突起部Pbが形成されている。この膨出溶着部Pは、傾斜した各羽根先端面21aとフロントプレート1との溶着部から羽根先端面21aの側端縁外方に形成されることにより、各羽根先端面21aとフロントプレート1との溶着接合面が拡大され相互部材間の溶着部をより強固にできる。   The bulging weld P is formed as an overhanging portion Pa by flowing on the curved surface (solid angle φ) of the conical surface where the blade tip surface 21a and the front plate 1 are joined, and a thin piece on the surface thereof. A burr-like protrusion Pb is formed. The bulging weld portion P is formed on the outer side edge of the blade tip surface 21a from the welded portion between the inclined blade tip surface 21a and the front plate 1, so that each blade tip surface 21a and the front plate 1 are formed. As a result, the welded joint surface between the two members can be enlarged and the welded portion between the mutual members can be made stronger.

また、前記膨出溶着部Pは前記フロントプレート1側では羽根2の厚さ方向に大きくなって、各羽根先端面21a側では該先端面の側端縁を囲むように羽根面(側面)へ食み出して張出し部Paとして形成され、前記フロントプレート1に対する各羽根先端面21aを保持固定する役目がある。このように形成された膨出溶着部Pの表面において、起伏状等の張出し部Paとバリ状突起部Pbが任意形成される。それらをショットブラストによりバリ状突起部Pbを除去すると共に起伏状等の張出し部Paをフロントプレート1の円錐状方向且つ円錐状に傾斜した羽根先端面21aの傾斜且つ放射方向に沿って滑らかな連続表面を形成する。   Further, the bulging weld portion P becomes larger in the thickness direction of the blade 2 on the front plate 1 side, and on the blade tip surface 21a side to the blade surface (side surface) so as to surround the side edge of the tip surface. It protrudes and is formed as an overhanging portion Pa, and serves to hold and fix each blade tip surface 21a with respect to the front plate 1. On the surface of the bulging weld part P formed in this way, an overhanging part Pa and a burr-like protrusion Pb are arbitrarily formed. The burr-shaped protrusions Pb are removed by shot blasting, and the bulge-like overhanging portion Pa is smoothly continuous along the conical direction of the front plate 1 and the blade tip surface 21a inclined conically, along the radial direction. Forming a surface.

また、膨出溶着部Pの表面におけるバリ状突起部Pbの除去痕が残った場合でも、除去痕は円錐状の傾斜方向且つ羽根2の単位羽根板21の放射方向に沿った滑らかな連続表面に形成される。滑らかな連続表面は、起伏状等の張出し部Paを平滑にすることだけではなく、起伏状等の張出し部Paにおいて凹凸の角部を羽根先端面21aの傾斜方向且つ放射方向に曲線状にして滑らかな起伏状等の張出し部Pa形状とすることが含まれる。すなわち、各羽根先端面21aの単位羽根板21の厚さ方向の端縁側に膨出した膨出溶着部Pの表面には、羽根先端面21aの傾斜且つ放射方向に沿ってバリ状突起Pbや起伏状の張出し部Paを平滑又は曲線状に滑らかな連続表面が形成される。   Even when the removal mark of the burr-like protrusion Pb on the surface of the bulging weld P remains, the removal mark is a smooth continuous surface along the conical inclined direction and the radial direction of the unit blade plate 21 of the blade 2. Formed. The smooth continuous surface not only smooths the undulation-like overhanging portion Pa, but also makes the corners of the unevenness in the undulation-like overhanging portion Pa curved in the inclination direction and radial direction of the blade tip surface 21a. It is included in the shape of an overhanging portion Pa such as a smooth undulation. That is, on the surface of the bulging weld portion P that bulges toward the edge in the thickness direction of the unit blade plate 21 of each blade tip surface 21a, the burr-like projections Pb or the like along the inclination and radial direction of the blade tip surface 21a A smooth continuous surface is formed on the undulating overhanging portion Pa in a smooth or curved shape.

クローズドインペラ内の流体が羽根2とフロントプレート1との溶着部より膨出した膨出溶着部Pにおいて滑らかに流れる流路となるように、該流路の一部を構成する膨出溶着部Pの表面が円錐状傾斜且つ羽根放射の方向に平滑状面又は起伏状等の曲面からなる滑らかな連続表面に形成されている。前記滑らかな連続表面を有する前記膨出溶着部Pが設けられることによりフロントプレート1と各羽根先端面21aとの溶着により形成されたクローズドインペラ内の流路において、流体の流れ方向に滑らかに流動させることができ、インペラ効率の低下を防ぐことができる。   A bulging weld P that constitutes a part of the flow path so that the fluid in the closed impeller becomes a flow path that smoothly flows in the bulge weld P that bulges from the weld between the blade 2 and the front plate 1. Is formed into a smooth continuous surface having a conical slope and a curved surface such as a smooth surface or an undulating shape in the direction of blade radiation. By providing the bulging weld portion P having the smooth continuous surface, the fluid flows smoothly in the flow direction of the fluid in the flow path in the closed impeller formed by welding the front plate 1 and each blade tip surface 21a. It is possible to prevent the impeller efficiency from being lowered.

また、前記滑らかな連続表面を有する膨出溶着部を設けるクローズドインペラ構造としたことで、前記膨出溶着部Pを小さくしようとする厳格な規制や面倒な工程管理が必要なくなり、生産を容易にすることができる。すなわち、量産性を高めることができる。羽根2の単位羽根板21の先端部とフロントプレート1とを溶着させることで、羽根2の根元とベースプレート3とを溶着させた溶着部(従来技術)より強度確保が容易となり溶着部が薄肉化できる。つまり、溶着部が薄肉化されることで、溶融樹脂を生成する際にガラス繊維等を適宜含有している合成樹脂よりガラス繊維等が少ない状態の合成樹脂を膨出溶着部Pに設けることができる。そのため、膨出溶着部の表面が加工し易くなることから、ショットブラストにより膨出溶着部Pの表面形成を容易にすることができるようになる。即ち、ショットブラストにより膨出溶着部の表面に発生したバリ状突起部を除去すると共に、該表面の粗い起伏、凸凹などをフロントプレート及び羽根の径方向(円錐状傾斜方向)且つ羽根放射方向に沿って滑らかな連続表面を容易に形成することができる。   In addition, the closed impeller structure provided with the bulging weld portion having a smooth continuous surface eliminates the need for strict regulation and troublesome process control for reducing the bulging welding portion P, and facilitates production. can do. That is, mass productivity can be improved. By welding the tip of the unit blade plate 21 of the blade 2 and the front plate 1, it is easier to secure strength than the welded portion (conventional technology) in which the base of the blade 2 and the base plate 3 are welded, and the welded portion is thinned. it can. That is, when the welded portion is thinned, the swelled welded portion P can be provided with a synthetic resin having less glass fibers or the like than a synthetic resin appropriately containing glass fibers or the like when the molten resin is generated. it can. Therefore, since the surface of the bulging weld portion can be easily processed, the surface formation of the bulging weld portion P can be facilitated by shot blasting. That is, burr-like protrusions generated on the surface of the bulging and welding part by shot blasting are removed, and rough undulations and irregularities on the surface are removed in the radial direction of the front plate and the blade (conical inclined direction) and the blade radial direction. A smooth continuous surface can be easily formed along.

図5(A)乃至(E)に示すように、前記膨出溶着部Pの張出し部Paは、羽根先端面21aの放射方向又は幅方向において膨出する大きさが異なる場合がある。例えば前記膨出溶着部Pの張出し部Pが略一様の大きさで膨出されていたり〔図5(B)及び(C)参照〕、また、図5(D)及び(E)に示すように、一様の大きさでない、大きさが異なるものがある。一様の大きさの場合は〔図5(C)参照〕、連続表面が平滑し易く、滑らかな面を形成することができる。一様の大きさでない、大きさが異なる場合は〔図5(D)及び(E)参照〕、連続表面が曲線状にし易く、滑らかな曲面を形成することができる。   As shown in FIGS. 5A to 5E, the overhanging portion Pa of the bulging weld portion P may have a different bulging size in the radial direction or the width direction of the blade tip surface 21a. For example, the overhanging portion P of the bulging welded portion P is bulged with a substantially uniform size (see FIGS. 5B and 5C), or as shown in FIGS. 5D and 5E. As such, there are some that are not uniform in size but different in size. In the case of a uniform size (see FIG. 5C), the continuous surface is easy to smooth, and a smooth surface can be formed. When the sizes are not uniform and the sizes are different [see FIGS. 5D and 5E], the continuous surface can be easily curved, and a smooth curved surface can be formed.

また、膨出溶着部Pの張出し部が局部的に形成されたもの、即ち、膨出溶着部の張出し部が形成されない箇所を有するものであっても膨出溶着部Pの大きさが異なるものであり、該膨出溶着部Pの張出し部がフロントプレート1及び羽根先端面21aに対して部分的に形成され、膨出溶着部Pの連続表面は、滑らかな繋ぎ面と連続表面とを形成することで、滑らかな流路が形成され、インペラの効率低下を防ぐことができる。   In addition, even if the overhanging portion of the bulging weld portion P is locally formed, that is, the bulging welding portion P has a different size even if it has a portion where the overhanging portion of the bulging welding portion is not formed. The protruding portion of the bulging weld portion P is partially formed with respect to the front plate 1 and the blade tip surface 21a, and the continuous surface of the bulging weld portion P forms a smooth connecting surface and a continuous surface. By doing so, a smooth flow path is formed, and a decrease in the efficiency of the impeller can be prevented.

前記膨出溶着部Pの張出し部は、図5(C)及び(D)に示すように、羽根先端面21aの両側面において膨出する大きさが異なるように形成されることがある。膨出溶着部Pの張出し部は羽根先端面21aの両側面において膨出する大きさが均一又は略均一であったり、均一でなく、大きさを異ならせたものがある。例えば、インペラの回転方向に対して、回転方向側(「回転前側」という。)に膨出を大きくし、それに対して回転方向と反対側(「回転後側」という。)に膨出を小さくして形成する。これは回転前側の羽根面は流体を押し流すポンプ作用面であるため、フロントプレート1と羽根先端面21aとの溶着を強固にし、且つ膨出溶着部の連続表面により滑らかな流路を形成することができる。   As shown in FIGS. 5C and 5D, the overhanging portion of the bulging weld P may be formed to have different bulging sizes on both side surfaces of the blade tip surface 21a. The overhanging portion of the bulging weld portion P may be uniform or substantially uniform in size on both side surfaces of the blade tip surface 21a, or may be different in size. For example, with respect to the rotation direction of the impeller, the bulge is increased on the rotation direction side (referred to as “pre-rotation side”), while the bulge is decreased on the side opposite to the rotation direction (referred to as “rotation rear side”). To form. This is because the blade surface on the front side of the rotation is a pumping surface that pushes fluid, so that the front plate 1 and the blade tip surface 21a are firmly welded, and a smooth flow path is formed by the continuous surface of the bulging weld portion. Can do.

また、回転前側の膨出を小さくし、それに対して回転後側の膨出を大きくして形成する。これは回転前側の羽根面は流体を押し流すポンプ作用面であるため、フロントプレート1と羽根先端面21aとの膨出溶着部Pを小さくして流路への膨出を小さく且つ連続表面をより滑らかにしつつ、その反対側(背面)における膨出溶着部Pの連続表面を滑らかな形状とし、流体の流れを円滑にでき、羽根2の背面で強固に保持することができる。   Further, the bulge on the front side of the rotation is reduced and the bulge on the rear side of the rotation is increased. This is because the blade surface on the front side of the rotation is a pump action surface that pushes the fluid, so that the bulging weld portion P between the front plate 1 and the blade tip surface 21a is reduced, and the bulge to the flow path is reduced and the continuous surface is further increased. While smoothing, the continuous surface of the bulging weld P on the opposite side (back surface) can be made into a smooth shape, the fluid can flow smoothly, and can be firmly held on the back surface of the blade 2.

羽根先端面の放射方向が略湾曲状に曲がっているようにすれば、適宜大きさのインペラ径に対して羽根先端面の放射方向の長さを直線的なものに比べ有効的に長くすることができ、フロントプレートとの接合面(羽根先端面の放射方向)の領域が増える(接合面積の増加)ことから、溶着部及び膨出溶着部が増えてインペラの剛性を高め、且つ、ポンプ効率を向上させることができる。   If the radial direction of the blade tip surface is bent in a substantially curved shape, the length of the radial direction of the blade tip surface with respect to the appropriately large impeller diameter should be effectively increased compared to a linear one. Because the area of the joint surface with the front plate (radial direction of the blade tip surface) increases (increased joint area), the welded part and the bulge weld part increase to increase the rigidity of the impeller, and the pump efficiency Can be improved.

前記膨出溶着部Pは羽根先端面21aの両側に形成された前記フロントプレート1の表面1b(円錐の内周面)との間に溜り用欠肉部(空間)20が形成され、その空間は膨出溶着部を形成する溶融樹脂の溜まり部としての役目を有する。前記溜り用欠肉部20は、羽根先端面21aを先細形状に形成する欠肉部によって羽根先端面21aと接合する前記フロントプレート1の表面1bとの間に形成される空間である。前記羽根先端面21aに形成された膨出溶着部Pの溜り用欠肉部20に、膨出溶着部Pが膨出され、その空間内に膨出溶着部Pが形成される。それにより膨出溶着部Pは、羽根2の側面より膨出する大きさを小さくすることができ、容易にインペラ内に滑らかな流路を形成することができる。   The bulging weld portion P is formed with a pooled lacking portion (space) 20 between the front surface 1b (conical inner peripheral surface) of the front plate 1 formed on both sides of the blade tip surface 21a. Has a role as a pool of molten resin forming the bulging weld. The pool lacking portion 20 is a space formed between the front surface 1b of the front plate 1 joined to the blade tip surface 21a by the lacking portion that forms the blade tip surface 21a in a tapered shape. The bulging weld portion P is bulged in the pooling lacking portion 20 of the bulging weld portion P formed on the blade tip surface 21a, and the bulging weld portion P is formed in the space. As a result, the bulging weld portion P can be reduced in size from the side surface of the blade 2, and a smooth flow path can be easily formed in the impeller.

また、膨出溶着部Pの溜まり部を形成する羽根先端面21aの先細形状に形成した欠肉部の形状は、三角形状、四角形状又は凹状、弧状形などがある。羽根先端面21aは、フロントプレート1の内周面の円錐状面、弧状円錐状面に適合した円錐状面、弧状円錐状面が形成される。羽根先端面21aとフロントプレート1の内周面とは円錐状面、弧状円錐状面とが接合され溶着部が形成されると共に、その溶着部の側面側に羽根先端面21aとフロントプレート1との間に形成された空間を膨出溶着部Pが溜まる溜り用欠肉部20として形成され、膨出溶着部Pが羽根2の側面から大きく膨出しないようにし、インペラ内の流路における突起をより小さくして、より滑らかな流路を形成することができる。さらに、インペラの効率低下をより防ぐことができる。   Moreover, the shape of the thin part formed in the taper shape of the blade | wing tip surface 21a which forms the pool part of the bulging welding part P has a triangular shape, square shape, a concave shape, an arc shape, etc. The blade tip surface 21a is formed with a conical surface on the inner peripheral surface of the front plate 1, a conical surface adapted to the arc conical surface, and an arc conical surface. The blade tip surface 21a and the inner peripheral surface of the front plate 1 are joined to a conical surface and an arc conical surface to form a welded portion, and the blade tip surface 21a and the front plate 1 are formed on the side of the welded portion. The space formed between them is formed as a pool lacking portion 20 in which the bulging weld portion P accumulates, so that the bulging weld portion P does not bulge greatly from the side surface of the blade 2, and a protrusion in the flow path in the impeller Can be made smaller and a smoother flow path can be formed. Further, it is possible to prevent the impeller efficiency from being lowered.

ここで、適宜な加圧下で外部からエネルギーを与えることにより樹脂表面温度を上昇させることで、前記フロントプレートと前記羽根先端面とを溶着する手段についてについて例を挙げる。(1)熱板溶着法、(2)振動溶着法、(3)レーザー照射溶着法、(4)高周波溶着法、(5)超音波溶着法などが挙げられる。
これらを簡単に説明すると、(1)熱板溶着法とは、両方の樹脂表面を予め高温にしておき、それ同士を押し付けることでお互いの樹脂を溶かし、溶着する手法である。
(2)振動溶着法とは、約数百Hzの振動を加えることで樹脂を溶かし溶着する方法である。
(3)レーザー照射溶着法とは、レーザー光線を溶着する箇所に当てることで樹脂を溶かし、溶着する方法である。
Here, an example will be given of a means for welding the front plate and the blade tip surface by increasing the resin surface temperature by applying energy from the outside under an appropriate pressure. (1) Hot plate welding method, (2) Vibration welding method, (3) Laser irradiation welding method, (4) High frequency welding method, (5) Ultrasonic welding method and the like.
Briefly explaining these, (1) hot plate welding is a technique in which both resin surfaces are preliminarily heated to melt each other's resin by pressing them together and welding.
(2) The vibration welding method is a method in which a resin is melted and welded by applying vibration of about several hundred Hz.
(3) The laser irradiation welding method is a method in which a resin is melted by applying a laser beam to a position to be welded, and welding is performed.

(4)超音波溶着法とは、約数万Hzの音波を溶着する部材に加えることで樹脂を溶かし、溶着する方法である。この場合には、好ましくは、前記羽根先端面21a,21a,・・上に、先端面より小さな三角形状の突起が設けられる。
他にも溶着方法は存在するが、主要な溶着方法としては以上である。
(4) The ultrasonic welding method is a method in which a resin is melted and welded by applying a sound wave of about several tens of thousands of Hz to a member to be welded. In this case, preferably, a triangular protrusion smaller than the tip surface is provided on the blade tip surfaces 21a, 21a,.
There are other welding methods, but the main welding methods are as described above.

例えば、前記超音波溶着法で本発明のクローズドインペラ構造を溶着した場合、円錐状に傾斜した立体角φを有する前記フロントプレートと前記羽根2全体の単位羽根板21、21、…上面の羽根先端面21a、21a、…とを微振動にて溶着する構成にすれば、前記フロントプレート及び羽根先端面の円錐状に傾斜した平面による「調芯作用」によって中心位置を一致させて2部材を高精度に一体化することができ、且つ、前記フロントプレートと前記羽根先端面との間に形成される膨出溶着部は円錐状傾斜且つ羽根放射方向に沿った連続表面が容易に形成することができるので、剛性が高く効率の良いクローズドインペラができる。つまり、前記フロントプレート1の表面1bに、前記羽根先端面21a,21a,・・と、接合する箇所に、溝などを設けて位置決めするという必要性は、一切しなくても、微振動にて溶着する構成によって自ずと相互の中心位置を一致することができ、極めて安価に製造できる利点もある。   For example, when the closed impeller structure of the present invention is welded by the ultrasonic welding method, the front blade having the solid angle φ inclined in a conical shape and the unit blades 21, 21,... If the surfaces 21a, 21a,... Are welded by slight vibration, the center position is made to coincide with each other by “centering action” by the conically inclined plane of the front plate and the blade tip surface. It can be integrated with high accuracy, and the bulging weld formed between the front plate and the blade tip surface can be easily formed with a conical slope and a continuous surface along the blade radial direction. As a result, a closed impeller with high rigidity and efficiency can be obtained. In other words, the need to position the front surface 1b of the front plate 1 by providing grooves or the like at the blade tip surfaces 21a, 21a,... The center positions can be made to coincide with each other by the welded structure, and there is an advantage that it can be manufactured at a very low cost.

前記フロントプレート1及び羽根先端面21a形状は、円錐面の一部とした内容であり、該円錐面を弧状(曲面)とした弧状円錐面にしたものがある。該弧状円錐面には、断面円弧の中間が内側に凹む形状の弧状円錐面や、断面円弧の中間が外側に膨らむ弧状円錐面などがある。   The shape of the front plate 1 and the blade tip surface 21a is a part of a conical surface, and there is an arc conical surface in which the conical surface is an arc (curved surface). The arc-shaped conical surface includes an arc-shaped conical surface having a shape in which the middle of the cross-section arc is recessed inward, and an arc-shaped conical surface in which the middle of the cross-section arc swells outward.

1…フロントプレート、1b…表面、2…羽根、21…単位羽根板、
21a…羽根先端面、3…ベースプレート、20…溜り用欠肉部、50…溶着部、
q…結合溶着部、P…膨出溶着部。
DESCRIPTION OF SYMBOLS 1 ... Front plate, 1b ... Surface, 2 ... Blade | wing, 21 ... Unit blade | wing plate,
21a ... blade tip surface, 3 ... base plate, 20 ... pooled portion, 50 ... welded portion,
q: Bonded weld, P: bulge weld.

Claims (3)

裁頭円錐状のフロントプレートと、複数放射方向に延びる単位羽根板の一端面を羽根先端面として形成した羽根とを備え、該羽根及び前記フロントプレートはガラス繊維等が含有する合成樹脂材からなり、前記フロントプレートの表面と前記羽根先端面とが接触されて適宜な加圧下で外部からエネルギーを与えることにより樹脂表面温度を上昇させることで、前記フロントプレート表面と前記羽根の羽根先端面との溶融樹脂によって溶着部が形成され、該溶着部は前記羽根及び前記フロントプレートよりガラス繊維等の含有量が少なくなって形成され、該ガラス繊維等の含有量が少ない溶着部から前記羽根側面に膨出した膨出溶着部が形成され、該膨出溶着部の表面に前記円錐状のフロントプレート及び前記羽根先端面の円錐状傾斜方向且つ羽根放射方向に沿って滑らかな連続表面が形成されてなることを特徴とするクローズドインペラ。   It comprises a truncated conical front plate and a blade formed by using one end surface of a unit blade plate extending in a plurality of radial directions as a blade tip surface, and the blade and the front plate are made of a synthetic resin material containing glass fiber or the like. The surface of the front plate and the blade tip surface are brought into contact with each other to increase the resin surface temperature by applying energy from the outside under appropriate pressure, so that the front plate surface and the blade tip surface of the blade are A welded portion is formed by the molten resin, and the welded portion is formed with less glass fiber content than the blade and the front plate, and swells from the welded portion with less glass fiber content to the side surface of the blade. An extended bulging weld portion is formed, and the conical front plate and the tip end surface of the conical inclined direction on the surface of the bulging weld portion and Closed impeller characterized by comprising formed a smooth continuous surface along the root radial direction. 請求項1において、前記膨出溶着部の表面は、ショットブラストにより前記円錐状のフロントプレート及び前記羽根先端面の円錐状傾斜方向且つ羽根放射方向に沿って滑らかな連続表面が形成されてなることを特徴とするクローズドインペラ。   2. The surface of the bulging weld portion according to claim 1, wherein a smooth continuous surface is formed by shot blast along the conical inclined direction of the conical front plate and the blade tip surface and the blade radial direction. Closed impeller characterized by. 請求項1において、前記羽根先端面の幅方向の側縁部に溜り用欠肉部が形成されてなることを特徴とするクローズドインペラ。
The closed impeller according to claim 1, wherein a pooled thin portion is formed at a side edge portion in a width direction of the blade tip surface.
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