WO2009107278A1 - 樹脂製ファン - Google Patents
樹脂製ファン Download PDFInfo
- Publication number
- WO2009107278A1 WO2009107278A1 PCT/JP2008/069855 JP2008069855W WO2009107278A1 WO 2009107278 A1 WO2009107278 A1 WO 2009107278A1 JP 2008069855 W JP2008069855 W JP 2008069855W WO 2009107278 A1 WO2009107278 A1 WO 2009107278A1
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- WO
- WIPO (PCT)
- Prior art keywords
- resin
- rib
- fan
- radial
- cylindrical
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0005—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fibre reinforcements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0046—Details relating to the filling pattern or flow paths or flow characteristics of moulding material in the mould cavity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/02—Selection of particular materials
- F04D29/023—Selection of particular materials especially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
- F04D29/329—Details of the hub
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/38—Blades
- F04D29/384—Blades characterised by form
- F04D29/386—Skewed blades
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
- B29C2045/0044—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks expelling moulding material outside the mould cavity at the weld line location
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/3835—Designing moulds, e.g. using CAD-CAM
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/08—Blades for rotors, stators, fans, turbines or the like, e.g. screw propellers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/08—Blades for rotors, stators, fans, turbines or the like, e.g. screw propellers
- B29L2031/087—Propellers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/40—Organic materials
- F05D2300/44—Resins
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/60—Properties or characteristics given to material by treatment or manufacturing
- F05D2300/603—Composites; e.g. fibre-reinforced
- F05D2300/6034—Orientation of fibres, weaving, ply angle
Definitions
- the present invention relates to a resin fan provided for cooling a radiator or an air conditioning condenser.
- a fan provided for cooling a vehicle radiator or an air conditioning condenser is generally formed by resin molding.
- Such fans are mainly designed for performance and the dimensions of each part, but because of the resin molding method, if the thickness of each part increases, it takes time to cool down after resin molding, resulting in production efficiency. Therefore, the thickness of each part is preferably as thin as possible. This is the same from the viewpoint of weight reduction.
- the strength of the fan decreases. Needless to say, it is not preferable to reduce the thickness of the product because the product quality is required to have sufficient strength to prevent damage after the start of use.
- the mechanical strength differs depending on the direction of the reinforcing fibers.
- FIG. 6A in the weld portion, when the resins P1 and P2 injected from different gates flow from the A direction and the B direction and merge, ), The flow of one resin P1 and the other resin P2 is bilaterally symmetric at the tip of the flow of the merged resins P1 and P2.
- the present invention has been made based on such a technical problem, and an object of the present invention is to provide a resin fan that can increase the mechanical strength in the weld portion in consideration of the direction of the reinforcing fibers.
- the resin fan of the present invention is formed of a resin containing glass fiber, and includes a plurality of blades and a boss portion to which the blades are integrally attached and connected to a motor.
- the boss part includes a plurality of radial ribs extending radially and a cylindrical cylindrical rib in which one ends of the radial ribs are integrally connected.
- a resin agitation part for increasing complexity is formed.
- the flow of the resin is complicated three-dimensionally when the resin that has passed through the part that forms one radial rib and the resin that has passed through the part that forms the other radial rib merge. This complicates the orientation of the glass fibers contained in both resins.
- a convex portion protruding to the outer peripheral side and / or the inner peripheral side of the cylindrical rib can be formed.
- the resin passing through the part forming the one radial rib and the part forming the other radial rib When flowing into the part forming the cylindrical rib through the part forming the radial rib adjacent to each other, the resin passing through the part forming the one radial rib and the part forming the other radial rib.
- the flow of resin is complicated because the cross-sectional area suddenly increases when it flows into the convex portion from the cylindrical rib.
- the projecting portion can be formed so that the projecting dimension gradually decreases from one side of the fan to the other side. Thereby, the direction component which goes to the one surface side from the other surface side of a fan can also be produced in the flow of resin, and a flow is further complicated.
- the cylindrical rib is preferably formed so that its radial thickness gradually decreases with a gradient of 3 degrees or more from one side of the fan to the other side.
- the cylindrical rib protrude toward the other surface side of the fan rather than the radial rib.
- the direction from the radial rib toward the protruding portion of the cylindrical rib, that is, toward the other surface side of the fan Components are produced, which also complicates the resin flow.
- the resin agitation portion comprising the convex portion formed on the cylindrical rib, the gradient of the thickness of the cylindrical rib, the projection of the cylindrical rib with respect to the radial rib, the portion forming one radial rib
- the flow of the resin when the resin that has passed through and the resin that has passed through the portion that forms the other radial rib merge can be complicated three-dimensionally. Thereby, the orientation of the glass fiber contained in both resins can be complicated. As a result, it is possible to increase the mechanical strength at the portion where the resin that has passed through the portion that forms one radial rib and the resin that has passed through the portion that forms the other radial rib merge.
- FIG. It is a figure for showing schematic shape of a fan in this embodiment, (a) is a figure seen from the disk part side of one side, (b) is from the side where the cylindrical rib etc. of the other side were formed.
- FIG. It is a figure which shows the principal part of a fan, (a) is a top view, (b) is a perspective sectional view. It is a figure which shows the principal part of the conventional fan as a comparative example, (a) is a top view, (b) is a perspective sectional view.
- FIG. 1A and 1B are diagrams for illustrating a schematic shape of a fan 10 according to the present embodiment, where FIG. 1A is a view seen from the disk portion 13 side on one side, and FIG. 1B is a cylindrical rib 16 on the other side. It is the figure seen from the side in which etc. were formed.
- the fan 10 includes a boss portion 11 for mounting on a shaft of a motor (not shown) for driving the fan 10, and a plurality of blades provided so as to protrude from the boss portion 11 to the outer peripheral side. 12 and the boss portion 11 and the blade 12 are made of resin mixed with glass fibers.
- the boss portion 11 is formed integrally with the circular disc-shaped disc portion 13 and the outer peripheral portion of the disc portion 13 so as to extend toward one surface side of the disc portion 13, and the base portion 12 a of the blade 12 is made to extend. And a support rib 14 for supporting the support rib 14.
- a shaft hole 15 into which a motor shaft (not shown) is inserted is formed at the center of the disk portion 13.
- a cylindrical cylindrical rib (cylindrical rib) 16 formed to extend toward one surface side of the disc portion 13 is formed on the outer peripheral side of the shaft hole 15.
- a radial rib 18 that extends substantially radially around the shaft hole 15 and a reinforcing rib 19 provided between the adjacent radial ribs 18, 18 are formed.
- the reinforcing ribs 19 include those that are continuous in the circumferential direction around the shaft hole 15 and those that extend obliquely between the adjacent radial ribs 18 and 18.
- a plurality of cooling holes 20 are formed in the disk portion 13 so as to penetrate through both sides of the disk portion 13 at positions not interfering with the support ribs 14, the cylindrical ribs 16, the radial ribs 18 and the reinforcing ribs 19.
- Such a fan 10 is formed by injecting resin from a gate formed in a mold, and cooling and solidifying.
- gate positions P1, P2,... For forming the fan 10 are located at a plurality of locations on the disk portion 13.
- the radial ribs 18, 18 adjacent to each other are provided in the middle portion of the portion where the cylindrical rib 16 is connected, with a convex portion (resin stirring portion) 30. Is formed.
- the inner peripheral surface 16b of the cylindrical rib 16 is formed in a circular shape in cross section.
- the cylindrical rib 16 is formed so that its radial thickness T gradually decreases from the base portion 16c of the cylindrical rib 16 on the disk portion 13 side toward the distal end portion 16d side.
- the height H1 of the cylindrical rib 16 from the disk portion 13 is set to be higher than the height H2 of the radial rib 18 connected to the cylindrical rib 16 (H1> H2).
- the height H1 can be set higher by about 1.0 mm than the height H2.
- the resin flow direction at the tip end portion 16 d of the cylindrical rib 16 is the axial direction of a shaft (not shown) inserted through the shaft hole 15. This further complicates the resin flow at the tip 16d of the cylindrical rib 16. Thereby, the orientation of the glass fibers mixed in the resin is further complicated.
- the radial ribs 18, 18 adjacent to each other form a convex portion 30 in the middle portion of the portion connected to the cylindrical rib 16, and the cylindrical rib 16 is
- the radial thickness T is formed so as to gradually decrease from the base portion 16c toward the distal end portion 16d, and the height H1 of the cylindrical rib 16 is higher than the height H2 of the radial rib 18.
- the convex portion 30 is formed, the thickness T of the cylindrical rib 16 is formed so as to gradually decrease from the base portion 16c toward the distal end portion 16d side, and the height of the cylindrical rib 16 is further increased. Since the effect in the case where the height H1 is set to be higher than the height H2 of the radial rib 18 has been examined, the result will be shown.
- the fan 10 as shown in FIG. 1 was formed of polypropylene (PP) containing 30% glass fiber.
- a convex portion 30 is formed at an intermediate portion of a portion where the adjacent radial ribs 18 and 18 are connected to the cylindrical rib 16.
- the convex portion 30 has a curvature radius R of 1.25 mm, and a curvature radius r of a continuous portion between the cylindrical rib 16 and the convex portion 30 is 1.0 mm.
- the thickness T of the tip portion 16d was 2.5 mm.
- the height H1 of the cylindrical rib 16 was set to 13.5 mm
- the height H2 of the radial rib 18 was set to 12.5 mm
- the cylindrical rib 16 was formed to be higher than the radial rib 18.
- the fan 10 ′ formed of polypropylene (PP) containing 30% glass fiber is similar to the fan 10 of the example in the outer periphery of a cylindrical rib 16 ′ having a diameter of 35 mm.
- the surface 16 a ′ was formed in a circular shape without forming the convex portion 30.
- the cylindrical rib 16 ′ has a normal draft angle (a mold gradient necessary for removing the fan 10 from the mold) of 1 °.
- the cylindrical rib 16 ′ was formed at the same height as the radial rib 18.
- FIG. 4A shows the analysis result of the comparative example
- FIG. 4B shows the analysis result of the example.
- FIG. 4A in the comparative example, in the weld portion where the resin that has passed through one radial rib 18 and the resin that has passed through the other radial rib 18 merge in the cylindrical rib 16 ′.
- the flow direction of the resin tends to be a specific direction (the portion within the dotted line in the figure).
- Example and the comparative example the high temperature durability test rotated by 200Hr and 1700 rpm in a 110 degreeC environment was done.
- the comparative example whitening and generation of cracks were observed in the cylindrical rib 16 ′.
- no particular problem was observed.
- the shape of the convex part 30 was illustrated in the said embodiment, it is not restricted to this.
- the convex part 30 can also be made into the cross-sectional shape of a quadratic curve instead of a fixed curvature radius.
- the projecting dimension Z of the convex portion 30 from the cylindrical rib 16 is gradually decreased from the base portion 30a on the disk portion 13 side toward the distal end portion 30b. May be. Thereby, the flow of the resin in the convex part 30 can be further complicated, and the above effect can be made more remarkable.
- the convex portion 30 can be formed so as to protrude not on the outer peripheral surface 16 a side but on the inner peripheral surface 16 b side of the cylindrical rib 16. Moreover, it can also form so that it may protrude to both the outer peripheral surface 16a side and the inner peripheral surface 16b side. In addition to this, as long as it does not depart from the gist of the present invention, the configuration described in the above embodiment can be selected or changed to another configuration as appropriate.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
このようなファンは、主に性能面を主眼としてその形状や各部寸法が設計されているが、樹脂成形という製法ゆえ、各部の肉厚が大きくなると樹脂成形後の冷却に時間がかかり、生産効率の低下を招くため、各部の肉厚はなるべく薄くするのが好ましい。これは、軽量化という観点からしても同様である。その一方で、肉厚が薄くなるとファンの強度が低下する。製品品質としては、使用開始後に破損等が生じない十分な強度が要求されるため、むやみに肉厚を薄くするのが好ましくないのは言うまでもない。
ところが、図6(a)に示すように、前記のウェルドの部分においては、互いに異なるゲートから注入された樹脂P1、P2がA方向、B方向から流れてきて合流するときに、図6(b)に示すように、合流した樹脂P1、P2の流れの先端部において、一方の樹脂P1と他方の樹脂P2の流れが左右対称となる。その結果、強化繊維Fの方向が樹脂の合わせ目に平行となりやすく、この部分は他の部分に比較すると特定の方向(図中X方向)の強度低下を招いてしまう。
このような問題は、特許文献1に記載の技術のように、ウェルドの部分の肉厚を厚くするのみでは十分に解決できるものではない。
本発明は、このような技術的課題に基づいてなされたもので、強化繊維の方向を考慮し、ウェルドの部分における機械的強度を高めることのできる樹脂製ファンを提供することを目的とする。
樹脂攪拌部においては、一方の放射状リブを形成する部分を通ってきた樹脂と、他方の放射状リブを形成する部分を通ってきた樹脂とが合流するときの樹脂の流れを3次元的に複雑化することで、双方の樹脂に含有されるガラス繊維の配向を複雑化する。
この凸部は、ファンの一面側から他面側に向けて、その突出寸法が漸次小さくなるよう形成することもできる。これにより、樹脂の流れに、ファンの他面側から一面側に向かうような方向成分も生じさせることができ、流れがさらに複雑化する。
図1は、本実施の形態におけるファン10の概略形状を示すための図であり、(a)は一面側のディスク部13側から見た図、(b)は他面側の円筒状リブ16等が形成された側から見た図である。
図1に示すように、ファン10は、ファン10を駆動するための図示しないモータのシャフトに取り付けるためのボス部11と、ボス部11から外周側に張り出すように設けられた複数枚のブレード12とから形成され、これらボス部11とブレード12は、ガラス繊維が混在する樹脂によって形成されている。
ディスク部13の中央部に、図示しないモータのシャフトが挿通されるシャフト孔15が形成されている。ディスク部13において、シャフト孔15の外周側には、ディスク部13の一方の面側に向けて延出するよう形成された筒状の円筒状リブ(筒状リブ)16が形成されている。
つまり、凸部30が形成された部分において、一方の放射状リブ18を通ってきた樹脂と、他方の放射状リブ18を通ってきた樹脂とが合流するときには、両側の円筒状リブ16から凸部30に樹脂が流れ込むと、その断面積が急激に拡大するため、樹脂の流れが乱れ、樹脂が撹拌される。これにより、凸部30内で樹脂が合流したときに、樹脂に混在するガラス繊維の配向が複雑化する。
ファン10の成形時に、ゲート位置P1、P2、…から注入され、放射状リブ18、18およびディスク部13を通ってきた樹脂が円筒状リブ16に流れ込むと、樹脂は、基部16cから先端部16dに向けて流れる。このとき、円筒状リブ16の厚さTが基部16cから先端部16dに向けて漸次小さくなるため、樹脂が基部16cから先端部16dに向けて流れるときの樹脂の流れが複雑になる。これにより、樹脂に混在するガラス繊維の配向が複雑化する。また、この影響により、凸部30に両側の円筒状リブ16から樹脂が流れ込んだときの流れも、より一層複雑化し、凸部30内におけるガラス繊維の配向がさらに複雑化する。
ファン10の成形時に、ゲート位置P1、P2、…から注入され、放射状リブ18、18およびディスク部13を通ってきた樹脂が円筒状リブ16に流れ込むと、円筒状リブ16の先端部16dにおいて、樹脂は、放射状リブ18の先端部18aから円筒状リブ16の先端部16dに向けて流れる。つまり、円筒状リブ16の先端部16dにおける樹脂の流れ方向は、シャフト孔15に挿通されるシャフト(図示無し)の軸線方向となる。すると、円筒状リブ16の先端部16dにおける樹脂の流れがさらに複雑になる。これにより、樹脂に混在するガラス繊維の配向がさらに複雑化する。
しかも、全体の肉厚を増すのではなく、凸部30の部分のみ突出させることで十分な強度向上効果が得られるため、成形に要する時間が長期化したり著しく重量増となることもなく、高い生産効率と経済性を維持できる。
(実施例)
ここで、図1に示したようなファン10を、ガラス繊維を30%含有させたポリプロピレン(PP)により形成した。ファン10は、径35mmの円筒状リブ16の外周面16aにおいて、互いに隣接する放射状リブ18、18がこの円筒状リブ16に接続された部分の中間部に凸部30を形成した。凸部30は、その曲率半径Rを1.25mmとし、円筒状リブ16と凸部30との連続部の曲率半径rを1.0mmとした。また、円筒状リブ16を、その径方向の厚さTが、基部16cから先端部16d側に向けて漸次小さくなるように、θ=3°で形成した。先端部16dの厚さTは2.5mmとした。さらに円筒状リブ16の高さH1を13.5mmとし、放射状リブ18の高さH2を12.5mmとし、円筒状リブ16の方が放射状リブ18よりも高くなるように形成した。
(比較例)
比較のため、図3に示したように、実施例のファン10と同様、ガラス繊維を30%含有させたポリプロピレン(PP)により形成したファン10’は、径35mmの円筒状リブ16’の外周面16a’を、凸部30を形成せずに、円形状とした。また、円筒状リブ16’は、通常の抜き勾配(金型からファン10を脱型する際に必要な金型の勾配)を1°とした。さらに円筒状リブ16’は、放射状リブ18と同じ高さに形成した。
その結果を図4に示す。図4(a)は比較例の解析結果、(b)は実施例の解析結果である。
図4(a)に示すように、比較例の場合、一方の放射状リブ18を通ってきた樹脂と、他方の放射状リブ18を通ってきた樹脂とが円筒状リブ16’において合流するウェルド部において、樹脂の流れ方向が特定の方向になりがちとなっている(図中点線内の部分)。
これに対し、図4(b)に示すように、実施例の場合、一方の放射状リブ18を通ってきた樹脂と、他方の放射状リブ18を通ってきた樹脂とが合流するウェルド部に形成された凸部30において、樹脂の流れ方向が複雑になっていることが確認された(図中点線内の部分)。
その結果、比較例においては、円筒状リブ16’に白化およびクラックの発生が認められた。これに対し実施例においては、特に不具合は認められなかった。
これ以外にも、本発明の主旨を逸脱しない限り、上記実施の形態で挙げた構成を取捨選択したり、他の構成に適宜変更することが可能である。
Claims (5)
- ガラス繊維を含有した樹脂により形成され、複数枚のブレードと、前記ブレードが一体に取り付けられ、モータに接続されるボス部と、を備えたファンであって、
前記ボス部は、
放射状に延びる複数本の放射状リブと、
前記放射状リブの一端が一体に連結された筒状の筒状リブと、
を備え、
前記筒状リブは、前記ファンの成形工程にて、前記ファンを形成する金型に注入された前記樹脂が、互いに隣接する前記放射状リブを形成する部分を通って前記筒状リブを形成する部分に流れ込んだときに、一方の前記放射状リブを形成する部分を通ってきた前記樹脂と、他方の前記放射状リブを形成する部分を通ってきた前記樹脂とが合流する箇所に、一方の前記放射状リブを形成する部分を通ってきた前記樹脂に含有される前記ガラス繊維と、他方の前記放射状リブを形成する部分を通ってきた前記樹脂に含有される前記ガラス繊維との配向を複雑化するための樹脂攪拌部が形成されていることを特徴とする樹脂製ファン。 - 前記樹脂攪拌部は、前記筒状リブの外周側および/または内周側に突出する凸部であることを特徴とする請求項1に記載の樹脂製ファン。
- 前記凸部は、前記ファンの一面側から他面側に向けて、その突出寸法が漸次小さくなるよう形成されていることを特徴とする請求項2に記載の樹脂製ファン。
- 前記筒状リブは、前記ファンの一面側から他面側に向けて、その径方向の厚さが3度以上の勾配で漸次小さくなるよう形成されていることを特徴とする請求項1に記載の樹脂製ファン。
- 前記筒状リブは、前記放射状リブよりも、前記ファンの他面側に突出していることを特徴とする請求項1に記載の樹脂製ファン。
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CN200880114363.0A CN101952101B (zh) | 2008-02-28 | 2008-10-31 | 树脂制风扇 |
EP08872832.4A EP2258532B1 (en) | 2008-02-28 | 2008-10-31 | Resin fan |
US12/746,987 US8596984B2 (en) | 2008-02-28 | 2008-10-31 | Resin fan |
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JP2008048487A JP4969493B2 (ja) | 2008-02-28 | 2008-02-28 | 樹脂製ファン |
JP2008-048487 | 2008-02-28 |
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US (1) | US8596984B2 (ja) |
EP (1) | EP2258532B1 (ja) |
JP (1) | JP4969493B2 (ja) |
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WO (1) | WO2009107278A1 (ja) |
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JP2015209832A (ja) * | 2014-04-30 | 2015-11-24 | 日清紡メカトロニクス株式会社 | 樹脂製ファンの中央部の形状 |
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Also Published As
Publication number | Publication date |
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JP4969493B2 (ja) | 2012-07-04 |
CN101952101B (zh) | 2014-10-15 |
JP2009202481A (ja) | 2009-09-10 |
US8596984B2 (en) | 2013-12-03 |
EP2258532B1 (en) | 2017-02-22 |
EP2258532A1 (en) | 2010-12-08 |
EP2258532A4 (en) | 2015-04-08 |
US20100272573A1 (en) | 2010-10-28 |
CN101952101A (zh) | 2011-01-19 |
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