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JP2940301B2 - Centrifugal fan - Google Patents

Centrifugal fan

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Publication number
JP2940301B2
JP2940301B2 JP13894292A JP13894292A JP2940301B2 JP 2940301 B2 JP2940301 B2 JP 2940301B2 JP 13894292 A JP13894292 A JP 13894292A JP 13894292 A JP13894292 A JP 13894292A JP 2940301 B2 JP2940301 B2 JP 2940301B2
Authority
JP
Japan
Prior art keywords
hub
shroud
centrifugal fan
suction
fan
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.)
Expired - Lifetime
Application number
JP13894292A
Other languages
Japanese (ja)
Other versions
JPH05312191A (en
Inventor
匡史 東田
政和 平居
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daikin Industries Ltd
Original Assignee
Daikin Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Daikin Industries Ltd filed Critical Daikin Industries Ltd
Publication of JPH05312191A publication Critical patent/JPH05312191A/en
Application granted granted Critical
Publication of JP2940301B2 publication Critical patent/JP2940301B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

PURPOSE:To restrain generation and growth of partial break away generated on the corner parts between blades and a shroud as far as possible. CONSTITUTION:This centrifugal fan is provided with a hub 9 connected to the rotary shaft 2a of a fan motor 2, a shroud 10 which is opposed to the hub 9 and provided with a suction port 11 on the center part, and many blades 12,... arranged between the outer circumferential parts of the hub 9 and the shroud 10 at regular intervals in the circumferential direction. Rounded corner part 13 with radius of curvature of which radius becomes larger going from the suction side toward the blow out side is provided on the corner part between the negative pressure face 12a of each blade 12 and the shroud 10.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【産業上の利用分野】本願発明は、遠心ファンに関し、
さらに詳しくはファンモータの回転軸が連結されるハブ
と、該ハブと対向し且つ中心部に吸込口を有するシュラ
ウドと、前記ハブとシュラウドとの外周部間に円周方向
等間隔で配置された多数の羽根とを備えた遠心ファンの
構造に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal fan,
More specifically, a hub to which a rotation shaft of a fan motor is connected, a shroud facing the hub and having a suction port at a center portion, and a circumferentially equidistant space between the hub and the outer periphery of the shroud are arranged. The present invention relates to a structure of a centrifugal fan having a large number of blades.

【0002】[0002]

【従来の技術】例えば、天井埋込式空気調和機において
は、図7に示すように、ケーシング1の天板1aに支持
されたファンモータ2の回転軸2aに枢着されたファン
ロータ3を備えた遠心ファンAが用いられている(例え
ば、特開平2ー218895号公報参照)。図7におい
て、符号4はファンロータ3の外周側を囲繞するように
配置された熱交換器4、5は熱交換器4の下方に配置さ
れたドレンパン、6はファンモータ2をケーシング天板
1aに支持するためのブラケット、7はファンロータ3
の吸込側に設けられた吸込ガイド、8は吹出空気通路で
ある。
2. Description of the Related Art For example, in an in-ceiling type air conditioner, as shown in FIG. 7, a fan rotor 3 pivotally mounted on a rotating shaft 2a of a fan motor 2 supported on a top plate 1a of a casing 1 is provided. A centrifugal fan A provided is used (for example, see Japanese Patent Application Laid-Open No. 2-218895). In FIG. 7, reference numeral 4 denotes heat exchangers 4 and 5 arranged so as to surround the outer peripheral side of the fan rotor 3, a drain pan arranged below the heat exchanger 4, 6 denotes a fan motor 2 and a casing top plate 1 a. Bracket for supporting the fan rotor 7
The suction guide 8 provided on the suction side of the air outlet 8 is a blow air passage.

【0003】そして、前記ファンロータ3は、ファンモ
ータ2の回転軸2aが連結されるハブ9と、該ハブ9と
対向し且つ中心部に吸込口11を有するシュラウド10
と、前記ハブ9とシュラウド10との外周部間に円周方
向等間隔で配置された多数の羽根12,12・・とによ
って構成されている(図8参照)。
The fan rotor 3 has a hub 9 to which the rotating shaft 2a of the fan motor 2 is connected, and a shroud 10 facing the hub 9 and having a suction port 11 at the center.
And a large number of blades 12, 12,... Arranged at equal circumferential intervals between the outer peripheral portions of the hub 9 and the shroud 10 (see FIG. 8).

【0004】[0004]

【発明が解決しようとする課題】上記のような構造のフ
ァンロータ3を矢印Mで示す方向に回転させた場合、図
9に示すように、流入境界層B1内の渦糸が羽根12の
前縁に巻きついて生じる馬蹄形渦E1、シュラウド面境
界層B2が羽根列内で転向する際に羽根圧力面12aか
ら負圧面12bへ向かう二次流れE2、遠心作用による
羽根面境界層B3内の半径方向流れおよびこれらの相互
作用によってシュラウド10と羽根負圧面12bとのコ
ーナ部に局所的剥離E3が生じ、該局所的剥離E3は、図
10ないし図12に示すように、吸込側から吹出側に向
かって徐々に成長して大きくなるという事実がある。
If the fan rotor 3 of the above-mentioned structure [0005] is rotated in the direction indicated by the arrow M, as shown in FIG. 9, vortex inflow boundary layer B 1 is vane 12 A horseshoe-shaped vortex E 1 generated around the leading edge, a secondary flow E 2 from the blade pressure surface 12a to the suction surface 12b when the shroud surface boundary layer B 2 turns in the blade row, and a blade surface boundary layer B due to centrifugal action. 3 and the interaction between them, a local separation E 3 occurs at the corner between the shroud 10 and the blade suction surface 12b, and the local separation E 3 , as shown in FIGS. There is the fact that it gradually grows and grows from the suction side to the outlet side.

【0005】このような局所的剥離E3の発生、成長
は、乱流騒音の発生源となるとともに、ファン性能の低
下をも引き起こすところから、その解消が待たれてい
る。
[0005] The occurrence and growth of such local delamination E 3 is a source of turbulent noise and also causes a reduction in fan performance.

【0006】本願発明は、上記の点に鑑みてなされたも
ので、遠心ファンにおける羽根とシュラウドとのコーナ
部に生ずる局所的剥離の発生、成長を可及的に抑制し得
るようにすることを目的とするものである。
SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has an object to minimize the occurrence and growth of local peeling occurring at the corner between a blade and a shroud in a centrifugal fan. It is the purpose.

【0007】[0007]

【課題を解決するための手段】請求項1の発明では、上
記課題を解決するための手段として、図面に示すよう
に、ファンモータ2の回転軸2aが連結されるハブ9
と、該ハブ9と対向し且つ中心部に吸込口11を有する
シュラウド10と、前記ハブ9とシュラウド10との外
周部間に円周方向等間隔で配置された多数の羽根12,
12・・とを備えた遠心ファンにおいて、前記各羽根1
2の負圧面12bとシュラウド10とのコーナ部に、吸
込側から吹出側に向かうに従って大きくなるR部13を
それぞれ設けている。
According to the first aspect of the present invention, as a means for solving the above-mentioned problems, as shown in the drawings, a hub 9 to which a rotating shaft 2a of a fan motor 2 is connected.
A shroud 10 facing the hub 9 and having a suction port 11 at the center, and a number of blades 12 arranged at equal circumferential intervals between outer peripheral portions of the hub 9 and the shroud 10;
12. In the centrifugal fan provided with
At the corners of the negative pressure surface 12b and the shroud 10, R portions 13 are provided which increase in size from the suction side to the blow side.

【0008】請求項2の発明では、上記課題を解決する
ための手段として、図面に示すように、前記請求項1記
載の遠心ファンにおいて、前記各羽根12の負圧面12
bとハブ9とのコーナ部に、吹出側に向かうに従って大
きくなるR部14をそれぞれ設けている。
According to the invention of claim 2, as a means for solving the above-mentioned problem, as shown in the drawing, in the centrifugal fan according to claim 1, the negative pressure surface 12 of each of the blades 12 is provided.
At the corners between the b and the hub 9, there are provided R portions 14 which become larger toward the blow-out side.

【0009】[0009]

【作用】請求項1の発明では、上記手段によって次のよ
うな作用が得られる。
According to the first aspect of the present invention, the following effects can be obtained by the above means.

【0010】即ち、各羽根12の負圧面12bとシュラ
ウド10とのコーナ部に、吸込側から吹出側に向かうに
従って大きくなるR部13をそれぞれ設けたことによ
り、羽根圧力面12aから負圧面12bへ向かう二次流
れE2(図9参照)がスムーズとなり、前記コーナ部に
おける局所的剥離E3(図9参照)の発生、成長が抑制
されることとなる。
That is, by providing R portions 13 that increase in size from the suction side to the discharge side at the corners of the suction surface 12b of each blade 12 and the shroud 10, the blade pressure surface 12a moves from the blade pressure surface 12a to the suction surface 12b. The oncoming secondary flow E 2 (see FIG. 9) becomes smooth, and the occurrence and growth of local separation E 3 (see FIG. 9) in the corner portion are suppressed.

【0011】請求項2の発明では、上記手段によって次
のような作用が得られる。
According to the second aspect of the present invention, the following effects can be obtained by the above means.

【0012】即ち、各羽根12の負圧面12bとハブ9
とのコーナ部に、吹出側に向かうに従って大きくなるR
部14をそれぞれ設けたことにより、ハブ側においても
若干生じるであろう局所的剥離の発生、成長をも抑制さ
れることとなる。
That is, the suction surface 12b of each blade 12 and the hub 9
R increases at the corners toward the outlet side
Providing the portions 14 also suppresses the occurrence and growth of local exfoliation that may occur slightly on the hub side.

【0013】[0013]

【発明の効果】請求項1の発明によれば、ファンモータ
2の回転軸2aが連結されるハブ9と、該ハブ9と対向
し且つ中心部に吸込口11を有するシュラウド10と、
前記ハブ9とシュラウド10との外周部間に円周方向等
間隔で配置された多数の羽根12,12・・とを備えた
遠心ファンにおいて、前記各羽根12の負圧面12bと
シュラウド10とのコーナ部に、吸込側から吹出側に向
かうに従って大きくなるR部13をそれぞれ設けて、羽
根圧力面12aから負圧面12bへ向かう二次流れE2
(図2参照)がスムーズとなるようにしたので、前記コ
ーナ部における局所的剥離E3(図9参照)の発生、成
長が抑制されることとなり、乱流騒音の低減およびファ
ン性能の向上に大いに寄与するという優れた効果があ
る。
According to the first aspect of the present invention, a hub 9 to which the rotating shaft 2a of the fan motor 2 is connected, a shroud 10 facing the hub 9 and having a suction port 11 at the center,
In a centrifugal fan provided with a large number of blades 12, 12,... Arranged at equal intervals in the circumferential direction between the outer peripheral portions of the hub 9 and the shroud 10, the negative pressure surface 12b of each blade 12 and the shroud 10 The corner portions are provided with R portions 13 that increase from the suction side to the blowout side, respectively, and a secondary flow E 2 from the blade pressure surface 12a to the negative pressure surface 12b is provided.
(See FIG. 2), the occurrence and growth of the local peeling E 3 (see FIG. 9) in the corner portion are suppressed, and the turbulence noise is reduced and the fan performance is improved. There is an excellent effect that contributes greatly.

【0014】請求項2の発明によれば、請求項1記載の
遠心ファンにおいて、各羽根12の負圧面12aとハブ
9とのコーナ部に、吹出側に向かうに従って大きくなる
R部14をそれぞれ設けて、ハブ側においても若干生じ
るであろう局所的剥離の発生、成長をも抑制できるよう
にしたので、乱流騒音の低減およびファン性能の向上に
より一層寄与するという優れた効果がある。
According to the second aspect of the present invention, in the centrifugal fan according to the first aspect, R portions 14 that increase in size toward the blowing side are provided at the corners of the suction surface 12a of each blade 12 and the hub 9, respectively. As a result, the occurrence and growth of local delamination, which may occur slightly on the hub side, can also be suppressed, so that there is an excellent effect that turbulence noise is reduced and fan performance is further improved.

【0015】[0015]

【実施例】以下、添付の図面を参照して、本願発明の好
適な実施例を説明する。
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

【0016】下記各実施例の遠心ファンは、従来技術の
項において説明した天井埋込式空気調和機(図7参照)
の送風装置として使用されるものであり、ファンモータ
2と、該ファンモータ2の回転軸2aが連結されるファ
ンロータ3とによって構成されている。
The centrifugal fan according to each of the following embodiments is a ceiling-mounted air conditioner described in the section of the prior art (see FIG. 7).
And comprises a fan motor 2 and a fan rotor 3 to which a rotating shaft 2a of the fan motor 2 is connected.

【0017】実施例1 図1ないし図6には、本願発明の実施例1にかかる遠心
ファンが示されている。本実施例は、請求項1および2
の発明に対応するものである。
Embodiment 1 FIGS. 1 to 6 show a centrifugal fan according to Embodiment 1 of the present invention. This embodiment relates to claims 1 and 2
It corresponds to the invention of the above.

【0018】前記ファンロータ3は、図1に示すよう
に、前記ファンモータ2の回転軸2aに連結される断面
略V字状のハブ9と、該ハブ9と対向し且つ中心部に吸
込口11を有するシュラウド10と、前記ハブ9とシュ
ラウド10との外周部間に円周方向等間隔で配置された
多数の羽根12,12・・とからなっている。
As shown in FIG. 1, the fan rotor 3 has a hub 9 having a substantially V-shaped cross section connected to the rotation shaft 2a of the fan motor 2, and a suction port at the center facing the hub 9. And a plurality of blades 12, 12,... Disposed at equal circumferential intervals between outer peripheral portions of the hub 9 and the shroud 10.

【0019】しかして、前記各羽根12の負圧面12b
とシュラウド10とのコーナ部には、図2および図4な
いし図6に示すように、吸込側から吹出側に向かうに従
って大きくなるR部13がそれぞれ設けられている。ま
た、前記各羽根12の負圧面12bとハブ9とのコーナ
部にも、吸込側から吹出側に向かうに従って大きくなる
R部14がそれぞれ設けられている。これらのR部1
3,14は、ファンロータ3を製作するに際して加工上
からできることのあるR部より大きなものとされてい
る。
The negative pressure surface 12b of each of the blades 12
As shown in FIG. 2 and FIGS. 4 to 6, R corners 13 which increase from the suction side to the discharge side are provided at the corners of the shroud 10 and the shroud 10, respectively. Also, the corners between the negative pressure surface 12b of each of the blades 12 and the hub 9 are also provided with R portions 14 that increase in size from the suction side to the blow side. These R parts 1
The portions 3 and 14 are larger than the R portions that can be formed from the processing when the fan rotor 3 is manufactured.

【0020】上記のように構成された遠心ファンにおい
ては、次のような作用が得られる。
In the centrifugal fan configured as described above, the following operation can be obtained.

【0021】既に、従来技術の項において説明したよう
に、ファンロータ3を矢印M方向に回転させると、吸込
空気流は、図2および図3に矢印Fで示すように流れる
が、その際シュラウド面境界層が羽根列内で転向する際
に羽根圧力面12aから負圧面12bへ向かう二次流れ
2(図2参照)が生ずる。ところが、本実施例におけ
るように、各羽根12の負圧面12bとシュラウド10
とのコーナ部に、吸込側から吹出側に向かうに従って大
きくなるR部13をそれぞれ設けた場合、前記二次流れ
2がスムーズとなる。従って、前記コーナ部における
局所的剥離の発生、成長が抑制されることとなって、乱
流騒音の低減およびファン性能の向上が図れるのであ
る。
When the fan rotor 3 is rotated in the direction of arrow M as already described in the section of the prior art, the suction air flow flows as shown by arrow F in FIGS. When the surface boundary layer turns in the blade row, a secondary flow E 2 (see FIG. 2) from the blade pressure surface 12a to the suction surface 12b occurs. However, as in the present embodiment, the suction surface 12b of each blade 12 and the shroud 10
The corner portion between the case where a larger R 13 toward the suction side in the outlet side respectively, the secondary flow E 2 becomes smoother. Therefore, the occurrence and growth of local peeling at the corners are suppressed, so that turbulent noise can be reduced and fan performance can be improved.

【0022】また、本実施例においては、各羽根12の
負圧面12bとハブ9とのコーナ部にも、吹出側に向か
うに従って大きくなるR部14をそれぞれ設けるように
しているため、ハブ側においても若干生じるであろう局
所的剥離の発生、成長をも抑制できることとなり、乱流
騒音の低減およびファン性能の向上がより一層図れるこ
ととなるのである。
In the present embodiment, the corners between the suction surface 12b of each blade 12 and the hub 9 are also provided with R portions 14 which become larger toward the blow-out side. Therefore, it is possible to suppress the occurrence and growth of local peeling, which may occur slightly, thereby further reducing turbulence noise and improving fan performance.

【0023】なお、羽根12とハブ9あるいはシュラウ
ド10とのコーナ部には、ファンロータ3の製作時に加
工上からできるR部ができることがあるが、該R部は小
さいため上記したような局所的剥離の発生、成長を抑制
する作用は得られない。
In the corner between the blade 12 and the hub 9 or the shroud 10, there is a case where an R portion can be formed from the processing when the fan rotor 3 is manufactured. The effect of suppressing the occurrence of peeling and growth cannot be obtained.

【0024】上記実施例では、羽根12の負圧面12b
とハブ9とのコーナ部にもR部14を設けるようにして
いるが、羽根12の負圧面12bとシュラウド10との
コーナ部にのみR部13を設けるようにした場合であっ
ても、ほぼ同様な作用効果を期待することができること
は勿論である。
In the above embodiment, the suction surface 12b of the blade 12
Although the R portion 14 is also provided at the corner portion of the blade 9 and the hub 9, even when the R portion 13 is provided only at the corner portion between the suction surface 12 b of the blade 12 and the shroud 10, almost Needless to say, the same operation and effect can be expected.

【0025】本願発明は、上記各実施例の構成に限定さ
れるものではなく、発明の要旨を逸脱しない範囲におい
て適宜設計変更可能なことは勿論である。
The invention of the present application is not limited to the configuration of each of the above embodiments, and it is a matter of course that the design can be changed as appropriate without departing from the gist of the invention.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本願発明の実施例1にかかる遠心ファンの斜視
図である。
FIG. 1 is a perspective view of a centrifugal fan according to a first embodiment of the present invention.

【図2】本願発明の実施例1にかかる遠心ファンの要部
拡大斜視図である。
FIG. 2 is an enlarged perspective view of a main part of the centrifugal fan according to the first embodiment of the present invention.

【図3】本願発明の実施例1にかかる遠心ファンの部分
拡大断面図である。
FIG. 3 is a partially enlarged sectional view of the centrifugal fan according to the first embodiment of the present invention.

【図4】図3のIV−IV拡大断面図である。FIG. 4 is an enlarged sectional view taken along line IV-IV of FIG. 3;

【図5】図3のV−V拡大断面図である。FIG. 5 is an enlarged sectional view taken along line VV of FIG. 3;

【図6】図3のVI−VI拡大断面図である。FIG. 6 is an enlarged sectional view taken along the line VI-VI in FIG. 3;

【図7】一般的な遠心ファンの使用例である天井埋込式
空気調和機の縦断面図である。
FIG. 7 is a longitudinal sectional view of a ceiling-embedded air conditioner that is a usage example of a general centrifugal fan.

【図8】従来の遠心ファンの部分拡大断面図である。FIG. 8 is a partially enlarged sectional view of a conventional centrifugal fan.

【図9】従来の遠心ファンにおける局所的剥離発生の状
態を説明する説明図である。
FIG. 9 is an explanatory diagram illustrating a state of occurrence of local separation in a conventional centrifugal fan.

【図10】図8のX−X拡大断面図である。FIG. 10 is an enlarged sectional view taken along line XX of FIG. 8;

【図11】図8のXI−XI拡大断面図である。FIG. 11 is an enlarged sectional view taken along the line XI-XI of FIG. 8;

【図12】図8のXII−XII拡大断面図である。FIG. 12 is an enlarged sectional view taken along the line XII-XII of FIG.

【符号の説明】[Explanation of symbols]

2はファンモータ、2aは回転軸、3はファンロータ、
9はハブ、10はシュラウド、11は吸込口、12は羽
根、12aは圧力面、12bは負圧面、13,14はR
部。
2 is a fan motor, 2a is a rotating shaft, 3 is a fan rotor,
9 is a hub, 10 is a shroud, 11 is a suction port, 12 is a blade, 12a is a pressure surface, 12b is a suction surface, and 13 and 14 are R.
Department.

Claims (2)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】 ファンモータ(2)の回転軸(2a)が
連結されるハブ(9)と、該ハブ(9)と対向し且つ中
心部に吸込口(11)を有するシュラウド(10)と、
前記ハブ(9)とシュラウド(10)との外周部間に円
周方向等間隔で配置された多数の羽根(12),(1
2)・・とを備えた遠心ファンであって、前記各羽根
(12)の負圧面(12b)とシュラウド(10)との
コーナ部には、吸込側から吹出側に向かうに従って大き
くなるR部(13)をそれぞれ設けたことを特徴とする
遠心ファン。
1. A hub (9) to which a rotating shaft (2a) of a fan motor (2) is connected, and a shroud (10) opposed to the hub (9) and having a suction port (11) in a center portion. ,
A large number of blades (12), (1) arranged at equal circumferential intervals between outer peripheral portions of the hub (9) and the shroud (10).
2) A centrifugal fan comprising: a radius portion, which becomes larger from the suction side to the air outlet side, at a corner between the suction surface (12b) of each of the blades (12) and the shroud (10). (13) A centrifugal fan provided with (13).
【請求項2】 前記各羽根(12)の負圧面(12a)
とハブ(9)とのコーナ部に、吹出側に向かうに従って
大きくなるR部(14)をそれぞれ設けたことを特徴と
する前記請求項1記載の遠心ファン。
2. A suction surface (12a) of each of the blades (12).
The centrifugal fan according to claim 1, characterized in that R corners (14) which increase in size toward the air outlet side are provided at the corners of the hub and the hub (9).
JP13894292A 1992-03-11 1992-05-29 Centrifugal fan Expired - Lifetime JP2940301B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1200592 1992-03-11
JP4-12005 1992-03-11

Publications (2)

Publication Number Publication Date
JPH05312191A JPH05312191A (en) 1993-11-22
JP2940301B2 true JP2940301B2 (en) 1999-08-25

Family

ID=11793472

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13894292A Expired - Lifetime JP2940301B2 (en) 1992-03-11 1992-05-29 Centrifugal fan

Country Status (1)

Country Link
JP (1) JP2940301B2 (en)

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JP4994421B2 (en) * 2009-05-08 2012-08-08 三菱電機株式会社 Centrifugal fan and air conditioner
JP5164932B2 (en) 2009-06-11 2013-03-21 三菱電機株式会社 Turbofan and air conditioner
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2295818A2 (en) 2009-08-11 2011-03-16 Sanyo Denki Co., Ltd. Centrifugal fan
US10415584B2 (en) 2017-10-20 2019-09-17 Minebea Mitsumi Inc. Impeller and fan using the same

Also Published As

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