JP2000337293A - Impeller for sirocco fan - Google Patents
Impeller for sirocco fanInfo
- Publication number
- JP2000337293A JP2000337293A JP11145217A JP14521799A JP2000337293A JP 2000337293 A JP2000337293 A JP 2000337293A JP 11145217 A JP11145217 A JP 11145217A JP 14521799 A JP14521799 A JP 14521799A JP 2000337293 A JP2000337293 A JP 2000337293A
- Authority
- JP
- Japan
- Prior art keywords
- impeller
- blade
- bent
- sirocco fan
- vanes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、金属板の切り起こ
しによって形成される複数の羽根を周方向に等間隔に配
列して成るシロッコファン用羽根車に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impeller for a sirocco fan in which a plurality of blades formed by cutting and raising a metal plate are arranged at equal intervals in a circumferential direction.
【０００２】[0002]
【従来の技術】遠心ファンの一種であるシロッコファン
はケーシング内で回転駆動される円筒状の羽根車を有
し、広い流量範囲での運転が可能であるために産業用換
気ファン等として広く利用されている。2. Description of the Related Art A sirocco fan, which is a kind of centrifugal fan, has a cylindrical impeller that is driven to rotate in a casing and can be operated in a wide flow rate range, so that it is widely used as an industrial ventilation fan. Have been.
【０００３】ところで、板金製のシロッコファン用羽根
車は、鉄又はアルミニウムの金属板にプレス加工による
切り起こしによって複数の羽根（ブレード）を等間隔に
突設して成る羽根板を形成し、この羽根板を円筒状に巻
き、これに支持プレートを取り付けて構成されている。[0003] By the way, a sheet metal sirocco fan impeller is formed by cutting and raising a metal plate of iron or aluminum by pressing to form a plurality of blades (blades) projecting at equal intervals. The blade is wound in a cylindrical shape, and a support plate is attached to the blade.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、従来の
シロッコファン用羽根車にあっては、金属板のプレス加
工によって形成される羽根は一般的には切り起こされた
まままであり、その周縁にはバリが発生していた。However, in conventional impellers for sirocco fans, the blades formed by pressing a metal plate generally remain cut and raised, and the periphery thereof is Burrs were occurring.
【０００５】ところで、近年、大風量の特性を活かして
家庭用キッチンのレンジフードにシロッコファンが用い
られるようになったため、羽根車を家庭で清掃する機会
が増えつつある。従って、羽根車の製造時に羽根の周縁
に発生したバリを取り除くことが清掃時の安全を確保す
る上から望ましい。By the way, in recent years, sirocco fans have been used as range hoods in home kitchens by taking advantage of the characteristics of a large air volume, so that opportunities for cleaning impellers at home are increasing. Therefore, it is desirable to remove burrs generated on the periphery of the blade during manufacture of the impeller from the viewpoint of ensuring safety during cleaning.
【０００６】そこで、従来は羽根車の羽根にブラシ掛け
や塗装等の後処理を施していたが、これらの後処理はコ
ストアップの要因となっていた。特に、金属板としてメ
ッキ材を使用した場合、ブラシ掛けによるバリ取りはメ
ッキの剥れや羽根の変形を招くために羽根の板厚を薄く
することができず、羽根車の高重量化を招く原因となっ
ていた。Therefore, conventionally, post-treatments such as brushing and painting have been applied to the blades of the impeller, but these post-treatments have caused an increase in cost. In particular, when a plating material is used as a metal plate, deburring by brushing causes peeling of plating and deformation of the blade, so that the blade thickness cannot be reduced, and the weight of the impeller increases. Was causing it.
【０００７】ところで、羽根の板厚を薄くした場合、プ
レス加工によっても羽根の周縁にバリが発生しにくい工
法（上下抜き等）も存在するが、この種の工法では金型
の管理が難しいためにバリ対策がなされていないのが現
状である。[0007] By the way, when the thickness of the blade is reduced, there is also a method (such as vertical punching) in which burrs are hardly generated on the peripheral edge of the blade even by press working. However, it is difficult to manage a mold with this type of method. At present, no burr measures are taken.
【０００８】他方、羽根の剛性アップや静音化を目的と
して羽根の周縁を折り曲げる提案がなされている（実開
昭６１−１７９３９５号、特公平５−７８６７７号公報
参照）が、この種の提案ではその目的から羽根の周縁を
部分的に折り曲げているに過ぎず、羽根車の清掃等のメ
ンテナンスにおける安全を確保するためのバリ対策とし
ては不十分である。On the other hand, proposals have been made to bend the periphery of the blade for the purpose of increasing the rigidity of the blade and reducing noise (see Japanese Utility Model Laid-Open No. 61-179395 and Japanese Patent Publication No. 5-78677). For this purpose, the periphery of the blade is only partially bent, and is not sufficient as a burr measure for ensuring safety in maintenance such as cleaning of the impeller.
【０００９】本発明は上記問題に鑑みてなされたもの
で、その目的とする処は、コストアップを招くことなく
羽根の全周縁にバリ対策を施してメンテナンス時の安全
性を確保するとともに、羽根の剛性を高めて薄肉軽量化
を図ることができるシロッコファン用羽根車を提供する
ことにある。SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and its object is to provide a burr countermeasure to the entire periphery of the blade without increasing the cost, to ensure safety during maintenance, and to improve the safety of the blade. It is an object of the present invention to provide a sirocco fan impeller capable of increasing the rigidity of the sirocco and reducing the thickness and weight.
【００１０】[0010]
【課題を解決するための手段】上記目的を達成するた
め、請求項１記載の発明は、金属板の切り起こしによっ
て形成される複数の羽根を周方向に等間隔に配列して成
るシロッコファン用羽根車において、前記各羽根の全周
縁を曲げ加工によって折り曲げたことを特徴とする。Means for Solving the Problems To achieve the above object, an invention according to claim 1 is for a sirocco fan in which a plurality of blades formed by cutting and raising a metal plate are arranged at equal intervals in a circumferential direction. In the impeller, the entire periphery of each of the blades is bent by bending.
【００１１】請求項２記載の発明は、請求項１記載の発
明において、前記各羽根の全周縁をその端縁が羽根の湾
曲方向内側になるように折り曲げ、その折り曲げ部を羽
根の内面に密着させたことを特徴とする。According to a second aspect of the present invention, in the first aspect of the present invention, the entire peripheral edge of each of the blades is bent so that the edge is inside the bending direction of the blade, and the bent portion is closely attached to the inner surface of the blade. It is characterized by having made it.
【００１２】従って、本発明によれば、羽根車の製造時
に各羽根の全周縁を曲げ加工によって折り曲げたため、
後処理を要することなく低コストで各羽根におけるバリ
の発生を全周縁に亘って防ぐことができ、当該羽根車の
清掃等のメンテナンス時の安全性を確保することができ
る。Therefore, according to the present invention, since the entire periphery of each blade is bent by bending at the time of manufacturing the impeller,
The generation of burrs on each blade can be prevented over the entire periphery at low cost without requiring post-processing, and safety during maintenance such as cleaning of the impeller can be ensured.
【００１３】又、各羽根はこれの全周縁が折り曲げられ
ることによって剛性が高められるため、その厚さを薄く
して羽根車全体の軽量化を図ることができる。Further, since the rigidity of each blade is increased by bending the entire periphery thereof, the thickness can be reduced to reduce the weight of the entire impeller.
【００１４】[0014]
【発明の実施の形態】以下に本発明の実施の形態を添付
図面に基づいて説明する。Embodiments of the present invention will be described below with reference to the accompanying drawings.
【００１５】図１はシロッコファンの正面図、図２は図
１の矢視Ａ方向の図、図３は本発明に係るシロッコファ
ン用羽根車の斜視図、図４は同羽根車を構成する羽根板
の部分斜視図、図５は同羽根板の部分断面図である。FIG. 1 is a front view of a sirocco fan, FIG. 2 is a view in the direction of arrow A in FIG. 1, FIG. 3 is a perspective view of an impeller for a sirocco fan according to the present invention, and FIG. FIG. 5 is a partial perspective view of the blade plate, and FIG. 5 is a partial sectional view of the blade plate.
【００１６】図１に示すシロッコファン１は板金製のケ
ーシング２内に本発明に係る羽根車３を回転自在に収納
して構成されており、羽根車３はケーシング２の一方の
端面に複数のブラケット４を介して取り付けられた電動
モータ５の駆動軸６の端部に片持状態で取り付けられて
いる。A sirocco fan 1 shown in FIG. 1 is constructed by rotatably storing an impeller 3 according to the present invention in a casing 2 made of sheet metal. It is attached in a cantilevered state to an end of a drive shaft 6 of an electric motor 5 attached via a bracket 4.
【００１７】又、上記ケーシング２の両端面には円形の
吸入口２ａが開口しており、各吸入口２ａの周縁には、
空気を前記羽根車３に導くためのベルマウス状のインレ
ットリング７が取り付けられている。そして、ケーシン
グ２内にはスクロール状の流路が形成されており、ケー
シング２の上部には矩形の吐出口２ｂが開口している
（図２参照）。A circular suction port 2a is opened at both end surfaces of the casing 2, and a peripheral edge of each suction port 2a is
A bellmouth-shaped inlet ring 7 for guiding air to the impeller 3 is attached. A scroll-shaped flow path is formed in the casing 2, and a rectangular discharge port 2b is opened in an upper part of the casing 2 (see FIG. 2).
【００１８】ところで、前記羽根車３は両吸込型であっ
て、図３に示すように、該羽根車３は複数枚の羽根（ブ
レード）８を円周方向に等角度ピッチで配列して円筒状
に成形されており、その両端には補強リング９，１０が
それぞれ取り付けられ、中央部には円板状の支持プレー
ト（バックプレート）１１が取り付けられている。そし
て、支持プレート１１の中心部にはプレス加工によって
一体成形されたハブ１２が固定されており、羽根車３は
このハブ１２を介して前記電動モータ５の駆動軸６に取
り付けられている（図２参照）。The impeller 3 is of a double suction type. As shown in FIG. 3, the impeller 3 has a plurality of blades (blades) 8 arranged at a constant angular pitch in a circumferential direction. Reinforcing rings 9 and 10 are respectively attached to both ends thereof, and a disc-shaped support plate (back plate) 11 is attached to a central portion. A hub 12 integrally formed by press working is fixed to the center of the support plate 11, and the impeller 3 is attached to the drive shaft 6 of the electric motor 5 via the hub 12 (FIG. 2).
【００１９】ところで、羽根車３の製造に際しては、図
４及び図５に示すように、厚さｔ＝０．３ｍｍの帯状の
亜鉛メッキ鋼板にプレス加工による切り起こしによって
円弧曲面状の複数の羽根８を等間隔ピッチＰで同側に一
体に突設して羽根板１３を得る。この羽根板１３を得る
過程において、切り起こされた各羽根８の全周縁は、図
示のようにその端縁が羽根８の湾曲方向内側（つまり、
羽根８の端縁に発生したバリが内側になる方向）になる
ようにブレード順送型を用いた曲げ加工（ヘム加工）に
よって折り曲げられ、その折り曲げ部８ａ，８ｂは羽根
８の内面に密着される（図５参照）。尚、折り曲げ部８
ａ，８ｂは従来はスクラップとして廃棄されていた部分
である。When the impeller 3 is manufactured, as shown in FIGS. 4 and 5, a plurality of circular arc-shaped blades are formed by cutting and raising a strip-shaped galvanized steel sheet having a thickness t = 0.3 mm by pressing. 8 are integrally protruded on the same side at an equal pitch P to obtain a blade plate 13. In the process of obtaining the blade plate 13, the entire periphery of each of the cut and raised blades 8 has, as shown in FIG.
The blade 8 is bent by a bending process (hem processing) using a progressive blade so that the burr generated on the edge of the blade 8 becomes inward, and the bent portions 8a and 8b are adhered to the inner surface of the blade 8. (See FIG. 5). The bent portion 8
Reference numerals a and 8b denote parts that have been conventionally discarded as scrap.
【００２０】而して、上述のようにして羽根板１３が得
られると、図４及び図５に示すように全く同一の２枚の
羽根板１３を羽根ピッチＰの半分である（Ｐ／２）ピッ
チだけ長さ方向にずらせてこれらを上下に重ね合わせ、
重ね合わされた２枚の羽根板１３を羽根８が内側になる
ようにして円筒状に巻き付けて羽根車本体を得る。する
と、羽根車本体の内周側には１枚の羽根板１３に形成さ
れた羽根８の倍の数の羽根８が（Ｐ／２）ピッチで円周
方向に配列されることとなる。When the blades 13 are obtained as described above, two identical blades 13 are half the blade pitch P as shown in FIGS. 4 and 5 (P / 2). ) These are shifted up and down by the pitch,
The impeller body is obtained by winding the two superposed blade plates 13 in a cylindrical shape with the blades 8 inside. Then, on the inner peripheral side of the impeller body, the number of blades 8 which is twice the number of blades 8 formed on one blade plate 13 is arranged in the circumferential direction at a (P / 2) pitch.
【００２１】以上の工程を経て得られる羽根車本体の両
端部に前記補強リング９，１０を嵌着するとともに、中
央部に前記ハブ１２が予め固定された支持プレート１１
を取り付けることによって図３に示すシロッコファン用
羽根車３が得られ、該羽根車３は、図２に示すように支
持プレート１１の中心部に固定されたハブ１２に挿通す
る電動モータ５の出力軸６に取り付けられて前述のよう
にケーシング２の内部に回転自在に収納される。The reinforcing rings 9 and 10 are fitted to both ends of the impeller body obtained through the above steps, and the hub 12 is fixed to the center of the support plate 11 in advance.
By attaching the impeller, an impeller 3 for a sirocco fan as shown in FIG. 3 is obtained, and the impeller 3 has an output of an electric motor 5 inserted into a hub 12 fixed to the center of the support plate 11 as shown in FIG. It is attached to the shaft 6 and is rotatably housed inside the casing 2 as described above.
【００２２】而して、図１及び図２に示すシロッコファ
ン１において、電動モータ５によって羽根車３がケーシ
ング２内で所定の速度で回転駆動されると、ケーシング
２の両側に開口する前記吸入口２ａからケーシング２内
に吸い込まれた空気が羽根車３の両端開口部から軸方向
（図２の左右方向）に吸い込まれて昇圧され、昇圧され
た空気は径方向外方に排出されてケーシング２内のスク
ロール状の流路を通って吐出口２ｂからケーシング２外
へ排出される。尚、本実施の形態に係る羽根車３は２枚
の羽根板１３を二重巻きして構成されるため、羽根８の
枚数は１枚の羽根板１３の羽根８の倍（羽根ピッチは１
／２）となり、これによって羽根車３の静圧能力が高め
られる。In the sirocco fan 1 shown in FIGS. 1 and 2, when the impeller 3 is driven to rotate at a predetermined speed in the casing 2 by the electric motor 5, the suction opening on both sides of the casing 2 is provided. The air sucked into the casing 2 from the opening 2a is sucked in the axial direction (left-right direction in FIG. 2) from the openings at both ends of the impeller 3, and the pressure is increased. The gas is discharged from the discharge port 2b to the outside of the casing 2 through a scroll-shaped flow path in the inside of the casing 2. In addition, since the impeller 3 according to the present embodiment is configured by winding two blades 13 twice, the number of the blades 8 is twice the number of the blades 8 of one blade 13 (the blade pitch is 1).
/ 2), whereby the static pressure capability of the impeller 3 is increased.
【００２３】以上のように、本実施の形態では、羽根車
３の製造時に各羽根８の全周縁を曲げ加工（ヘム加工）
によってバリが内側になる方向に折り曲げたため、ブラ
シ掛けや塗装等の後処理を要することなく低コストで各
羽根８におけるバリの発生を全周縁に亘って防ぐことが
でき、当該羽根車３の清掃等のメンテナンス時の安全性
を確保することができる。尚、前述のように各羽根８の
折り曲げ部８ａ，８ｂは従来はスクラップとして廃棄さ
れていた部分であるため、新たにコストアップとなる要
因は存在しない。As described above, in the present embodiment, the entire periphery of each blade 8 is bent (hemmed) when the impeller 3 is manufactured.
The burr is bent inward so that burr generation on each blade 8 can be prevented over the entire periphery at low cost without requiring post-processing such as brushing or painting, and the impeller 3 is cleaned. Safety during maintenance such as can be ensured. As described above, since the bent portions 8a and 8b of the blades 8 are portions that have been conventionally discarded as scrap, there is no new cost increase factor.
【００２４】又、各羽根８はこれの全周縁が折り曲げら
れることによって剛性が高められるため、その厚さを薄
くして羽根車３全体の軽量化を図ることができる。具体
的には、従来は厚さ０．４〜０．８ｍｍの金属板を使用
していたが、本実施の形態ではそれよりも薄い０．３ｍ
ｍの亜鉛メッキ鋼板を使用することができ、アルミニウ
ム板を使用する場合よりも軽量化を図ることができた。Further, since the rigidity of each blade 8 is increased by bending the entire periphery thereof, the thickness of the blade 8 can be reduced and the weight of the entire impeller 3 can be reduced. Specifically, conventionally, a metal plate having a thickness of 0.4 to 0.8 mm was used, but in the present embodiment, a thinner 0.3 m is used.
m can be used, and the weight can be reduced as compared with the case where an aluminum plate is used.
【００２５】尚、以上は本発明を両吸込型の羽根車に対
して適用した形態について述べたが、本発明は片吸込型
の羽根車に対しても同様に適用可能であることは勿論で
ある。Although the present invention has been described with reference to the embodiment in which the present invention is applied to a double suction type impeller, the present invention is naturally applicable to a single suction type impeller. is there.
【００２６】[0026]
【発明の効果】以上の説明で明らかなように、本発明に
よれば、金属板の切り起こしによって形成される複数の
羽根を周方向に等間隔に配列して成るシロッコファン用
羽根車において、前記各羽根の全周縁を曲げ加工によっ
て折り曲げたため、コストアップを招くことなく羽根の
全周縁にバリ対策を施してメンテナンス時の安全性を確
保するとともに、羽根の剛性を高めて当該シロッコファ
ン用羽根車の薄肉軽量化を図ることができるという効果
が得られる。As is apparent from the above description, according to the present invention, in a sirocco fan impeller in which a plurality of blades formed by cutting and raising a metal plate are arranged at equal intervals in a circumferential direction, Since the entire periphery of each blade is bent by bending, the entire periphery of the blade is secured against burrs without increasing the cost, ensuring safety during maintenance, and increasing the rigidity of the blade to increase the rigidity of the blade for the sirocco fan. The effect that the thickness and weight of the vehicle can be reduced can be obtained.
【図１】シロッコファンの正面図である。FIG. 1 is a front view of a sirocco fan.
【図２】図１の矢視Ａ方向の図である。FIG. 2 is a view in the direction of arrow A in FIG. 1;
【図３】本発明に係るシロッコファン用羽根車の斜視図
である。FIG. 3 is a perspective view of an impeller for a sirocco fan according to the present invention.
【図４】本発明に係るシロッコファン用羽根車を構成す
る羽根板の部分斜視図である。FIG. 4 is a partial perspective view of a blade plate constituting the sirocco fan impeller according to the present invention.
【図５】本発明に係るシロッコファン用羽根車を構成す
る羽根板の部分断面図である。FIG. 5 is a partial sectional view of a blade plate constituting the sirocco fan impeller according to the present invention.
１ シロッコファン ３ シロッコファン用羽根車 ５ 電動モータ ６ 出力軸 ８ 羽根 ８ａ，８ｂ 折り曲げ部 １３ 羽根板 Reference Signs List 1 sirocco fan 3 impeller for sirocco fan 5 electric motor 6 output shaft 8 blade 8a, 8b bent portion 13 blade plate
Claims (2)
複数の羽根を周方向に等間隔に配列して成るシロッコフ
ァン用羽根車において、 前記各羽根の全周縁を曲げ加工によって折り曲げたこと
を特徴とするシロッコファン用羽根車。1. A sirocco fan impeller in which a plurality of blades formed by cutting and raising a metal plate are arranged at equal intervals in a circumferential direction, wherein the entire periphery of each blade is bent by bending. Sirocco fan impeller.
湾曲方向内側になるように折り曲げ、その折り曲げ部を
羽根の内面に密着させたことを特徴とする請求項１記載
のシロッコファン用羽根車。2. The sirocco fan according to claim 1, wherein the entire periphery of each of the blades is bent so that the edge thereof is inside the bending direction of the blade, and the bent portion is closely attached to the inner surface of the blade. Impeller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11145217A JP2000337293A (en) | 1999-05-25 | 1999-05-25 | Impeller for sirocco fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11145217A JP2000337293A (en) | 1999-05-25 | 1999-05-25 | Impeller for sirocco fan |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2011150000A Division JP5250085B2 (en) | 2011-07-06 | 2011-07-06 | Sirocco fan impeller for range hood |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000337293A true JP2000337293A (en) | 2000-12-05 |
Family
ID=15380081
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11145217A Pending JP2000337293A (en) | 1999-05-25 | 1999-05-25 | Impeller for sirocco fan |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000337293A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019011704A (en) * | 2017-06-30 | 2019-01-24 | パナソニックＩｐマネジメント株式会社 | Centrifugal impeller of sirocco fan, and range hood using the same |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2419411A (en) * | 1944-11-13 | 1947-04-22 | Robert A Mayne | Blower |
| US3010187A (en) * | 1958-03-10 | 1961-11-28 | Vernco Corp | Method of making double bladed blower wheel |
| JPS50148908A (en) * | 1974-05-20 | 1975-11-28 | ||
| JPS5865521A (en) * | 1981-10-14 | 1983-04-19 | Mitsuike Kogyo Kk | Curling forming method |
| JPS5947397U (en) * | 1982-09-22 | 1984-03-29 | 有限会社加藤製作所 | multi-blade fan impeller |
| JPS61186129A (en) * | 1985-02-13 | 1986-08-19 | Toyota Motor Corp | Hemming process for drawings |
| JPH05113197A (en) * | 1991-10-23 | 1993-05-07 | Fuji Kogyo Kk | Manufacture of multiblade fan |
| JPH11216521A (en) * | 1998-01-27 | 1999-08-10 | Hoshino Kinzoku Kogyo Kk | Curling method of punching material |
-
1999
- 1999-05-25 JP JP11145217A patent/JP2000337293A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2419411A (en) * | 1944-11-13 | 1947-04-22 | Robert A Mayne | Blower |
| US3010187A (en) * | 1958-03-10 | 1961-11-28 | Vernco Corp | Method of making double bladed blower wheel |
| JPS50148908A (en) * | 1974-05-20 | 1975-11-28 | ||
| JPS5865521A (en) * | 1981-10-14 | 1983-04-19 | Mitsuike Kogyo Kk | Curling forming method |
| JPS5947397U (en) * | 1982-09-22 | 1984-03-29 | 有限会社加藤製作所 | multi-blade fan impeller |
| JPS61186129A (en) * | 1985-02-13 | 1986-08-19 | Toyota Motor Corp | Hemming process for drawings |
| JPH05113197A (en) * | 1991-10-23 | 1993-05-07 | Fuji Kogyo Kk | Manufacture of multiblade fan |
| JPH11216521A (en) * | 1998-01-27 | 1999-08-10 | Hoshino Kinzoku Kogyo Kk | Curling method of punching material |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019011704A (en) * | 2017-06-30 | 2019-01-24 | パナソニックＩｐマネジメント株式会社 | Centrifugal impeller of sirocco fan, and range hood using the same |
| JP7090218B2 (en) | 2017-06-30 | 2022-06-24 | パナソニックＩｐマネジメント株式会社 | Sirocco fan impeller, range hood using it |
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