JP3872009B2

JP3872009B2 - Air outlet device

Info

Publication number: JP3872009B2
Application number: JP2002370461A
Authority: JP
Inventors: 章吉田; 保中山; 洋一中島
Original assignee: Obayashi Corp; Kuken Kogyo Co Ltd
Current assignee: Obayashi Corp; Kuken Kogyo Co Ltd
Priority date: 2002-12-20
Filing date: 2002-12-20
Publication date: 2007-01-24
Anticipated expiration: 2022-12-20
Also published as: JP2004198084A

Description

【０００１】
【発明の属する技術分野】
本発明は、空気調和の対象となる空間における天井あるいは壁面に配置され、供給される空気調和用気体を前記空気調和対象空間に向け吹出す吹出口装置に関し、特に冷房時における吹出口周辺部への結露を防止できる吹出口装置に関する。
【０００２】
【従来の技術】
空気調和設備の一部として、ダクトを通じて供給される調和空気を室内空間に吹出す吹出口装置は、用途に応じて様々な形状のものが従来から用いられている。その中で、出入口やペリメータゾーン等の特定の箇所での使用や、吹出口形状が細幅に制限される用途に適するものとして、ライン型の吹出口装置がある。この従来のライン型の吹出口装置の一例を図３に示す。この図３は従来の吹出口装置の要部断面図である。
【０００３】
前記図３において従来の吹出口装置１００は、天井６０に配設され、ダクト（図示を省略）と接続されて調和空気を供給される略箱状体で形成される構成である。室内空間に面する開口端部には、周囲に所定幅の額縁部１０１が配設され、天井６０を形成する天井パネル６１と連結している。この従来の吹出口装置１００においては、ダクトから取入れた調和空気をそのまま開口方向もしくは内部の案内手段１０２で案内された所定方向に吹出し、調和空気を室内空間に適切に拡散させて室内空間の空気調和を図っていた。
【０００４】
この従来の吹出口装置においては、特に冷房の際、吹出す冷たい調和空気により吹出口装置１００の各部やこれらと一体化された天井パネル６１が冷却されることから、二次空気として誘引された室内の温かい空気が室内空間に面する額縁部１０１やその周囲の天井パネル６１に直接接触すると結露を生じてしまうという問題があった。こうした結露を防止するために、従来から吹出口装置１００の全面に植毛を施したり、断熱材を貼付けたりする等の断熱処理も行われていたが、吹出口装置１００の構造が複雑化し、コスト高になるばかりでなく、製造工程も複雑化して製造に手間がかかってしまうという問題も発生していた。
【０００５】
このため、近年、冷たい調和空気を吹出口装置の天井寄り部分に近付けないようにしてこれらの部分の冷却を防ぎ、結露を抑える吹出口装置が提案されている。こうした吹出口装置の一例として、特開２００２−２９５８８６号公報に記載されるものがあり、これを図４に示す。図４は従来の他の吹出口装置の縦断面図である。
【０００６】
前記図４において従来の他の吹出口装置２００は、天井６０に配設され、ダクト５０と接続されて調和空気を供給される略筒状体で形成される構成である。吹出口装置２００の室内側にはフランジ部２０１が形成される一方、ダクト５０寄りには板状の放熱フィン２０２が形成され、これらフランジ部２０１と放熱フィン２０２間の内壁にスリット状の開口部２０３が設けられる。この開口部２０３を介して、吹出口装置２００内部と天井裏の空間部１０が連通している。
【０００７】
この従来の他の吹出口装置２００においては、ダクト５０から取入れた冷房用空気を室内空間に吹出す際、開口部２０３から室内空気や冷房用空気より温度の高い前記空間部１０の空気が誘引され、この空間部１０の空気が吹出口周りに送給され、高温空気層を形成するため、吹出される冷房用空気が吹出口周りに接触するのを阻止でき、吹出口周りの表面温度低下を抑制することとなり、二次空気として誘引される室内の温かい空気が室内空間に面するフランジ部２０１やその周囲に直接接触しても、室内空気は露点まで冷えることはなく、結露発生を防げる仕組みとなっている。
【０００８】
【発明が解決しようとする課題】
従来の吹出口装置は以上のように構成されており、従来後者の場合、空間部１０からの誘引空気導入で吹出口装置２００の天井寄り部分が冷却されず、室内の温かい空気がフランジ部２０１やその周囲に直接接触しても結露を生じにくい仕組みとなっていたが、吹出口装置２００の室内開口幅や開口部２０３のスリット幅等の設定、並びに上流側のダクト５０の接続方向によっては、吹出される調和空気による空間部１０の空気の誘引効率が悪くなり、冷房用空気が吹出口周りに接触するのを一部阻止できず、適切に結露防止を図れない場合があるという課題を有していた。
【０００９】
本発明は前記課題を解消するためになされたもので、空気調和用気体の吹出しに伴う空間部の空気の誘引を確実に行わせて吹出口周りへの空気調和用気体の温度の影響を排除し、空気調和対象空間寄り部分の温度低下を防いで結露の発生を防止できる吹出口装置を提供することを目的とする。
【００１０】
【課題を解決するための手段】
本発明に係る吹出口装置は、空気調和の対象となる空間に面する天井又は壁の所定位置に配設され、空気調和用の気体を供給されて当該気体を前記空気調和対象空間へ吹出す吹出口装置において、前記空気調和用気体を供給される略筒状体で形成され、当該略筒状体の空気調和対象空間寄り所定範囲部分が当該所定範囲部分より上流側部分に対して断熱状態とされてなる吹出口本体と、当該吹出口本体の前記上流側部分における最下流側の内部に開口断面積を上流側端部から下流側端部にかけて徐々に縮小させる形状として配設される絞り部と、前記絞り部より上流側の前記吹出口本体内部に配設され、供給される空気調和用気体を整流して一様に空気調和対象空間側へ向わせる整流用羽根とを備え、前記吹出口本体が、前記空気調和対象空間寄り所定範囲部分の一又は複数箇所に前記天井又は壁の内側に存在する空間部へ通じる開口孔を穿設されると共に、空気調和対象空間側の開口端部周囲に所定幅分突出する額縁部を形成され、当該額縁部を空気調和対象空間に面する状態とされてなり、前記絞り部を通過して吹出される空気調和用気体の気流に、前記開口孔を通じて前記空間部の空気が誘引され、前記吹出口本体の開口孔より下流側の内周面近傍に前記空間部の空気の誘引気流が生じるものである。
【００１１】
このように本発明においては、略筒状の吹出口本体の空気調和対象空間寄り所定範囲部分を他の部分に対して断熱状態とすると共に、この空気調和対象空間寄り部分に天井又は壁の内側空間部へ通じる開口孔が配設され、開口孔の上流側には整流用羽根と絞り部を配設し、吹出口本体に供給された空気調和用気体が整流用羽根で整流された後絞り部を通過し、この絞り部で吹出し範囲を制限されつつ流速を高められることにより、空気調和用気体による開口孔を通じた吹出口本体内への空間部空気の誘引効率を高めて吹出口本体内へ空間部の空気を十分に導入できると共に、整流用羽根で偏流を抑えられ且つ絞り部で吹出し範囲を制限された空気調和用気体が絞り部以降の吹出口本体内周面へ近寄らないこととなり、誘引された空間部の空気を吹出口本体表面近傍に確実に存在させて空気調和用気体と吹出口本体の空気調和対象空間寄り部分との接触を阻止でき、特に冷房の場合に吹出口本体の空気調和対象空間寄り部分の温度低下とこれに伴う結露発生を抑制できる。また、空間部の空気の吹出口本体内への誘引が整流用羽根より上流側における空気調和用気体流れ状態の影響を受けにくく、吹出口本体とその上流側の空気調和用気体流路との接続関係の制約が少なくなり、吹出口設置の自由度が増す。
【００１２】
また、本発明に係る吹出口装置は必要に応じて、前記吹出口本体が、前記空気調和対象空間寄り所定範囲部分を良熱伝導性材料製とされると共に、当該良熱伝導性材料部分に一体に連結されると共に熱の授受を可能とされて前記空間部に突出するフィンを有するものである。
このように本発明においては、吹出口本体の空気調和対象空間寄り部分を良熱伝導性材料製とすると共に、良熱伝導性材料部分に一体化して天井又は壁の内側空間部に突出するフィンが配設され、空間部の熱がフィンを介して吹出口本体に伝わったり、吹出口本体の熱がフィンから空間部に放出されたりする状態が得られることにより、特に冷房の場合、一般に空気調和対象空間より高温である空間部の熱を吹出口本体とその周りにフィンを通じて伝え、吹出口周りの温度を空間部の温度に近付けることができ、吹出口近傍に誘引された空気調和対象空間内の気体と吹出口本体の額縁部等が接触した場合でも、結露をより確実に防止できる。
【００１３】
また、本発明に係る吹出口装置は必要に応じて、前記フィンが、前記吹出口本体の前記良熱伝導性材料部分における前記開口孔より上流側の所定箇所から前記空間部に天井面又は壁面と略平行として突出配設されるものである。
このように本発明においては、フィンを開口孔より上流側から空間部に突出配設すると共に、その向きを天井面又は壁面と略平行とし、空間部から開口孔にかけてフィンと天井面又は壁面とに挟まれた領域を吹出口本体内へ誘引される空間部の空気が通過することにより、誘引された空間部の空気がフィンに案内されて開口孔に向けてスムーズに導入されることとなり、誘引量を大きくすることができると共に、誘引された空間部の空気がフィンに沿って進むため、空間部の空気とフィンとの間の熱伝達を促進でき、吹出口本体の良熱伝導性材料部分における温度を空間部の温度により一層近付けられる。
【００１４】
また、本発明に係る吹出口装置は必要に応じて、前記吹出口本体が、空気調和対象空間寄り開口をアスペクト比の大きい矩形状とされると共に、前記開口孔の空気調和用気体流れ方向における開口幅を１０ｍｍとされてなり、前記絞り部の前記吹出口本体開口短辺方向における開口幅が、吹出口本体の開口幅の約４０％分とされてなるものである。
このように本発明においては、吹出口本体の開口をアスペクト比の大きい矩形状とし、開口孔の開口幅を１０ｍｍに設定すると共に、絞り部の開口幅を吹出口本体開口幅の４０％分として、絞り部と開口孔との配置関係を最適化することにより、空気調和用気体の吹出しに吹出口本体の空気調和対象空間寄り部分が干渉することもなく、誘引の効率を最大限に高めて確実に吹出口本体の内側へ空間部の空気を流入させ、吹出口本体近傍の誘引空気量を十分確保でき、吹出口周囲への結露発生を確実に防止できる。
【００１５】
【発明の実施の形態】
以下、本発明の一実施の形態に係る吹出口装置について、図１及び図２に基づいて説明する。なお、本実施の形態では天井に配設されるライン型吹出口装置の冷房時の例を示す。図１は本実施の形態に係る吹出口装置の正面図、図２は本実施の形態に係る吹出口装置の要部拡大断面図である。
前記各図に示すように、本実施の形態に係る吹出口装置１は、空気調和対象となる室内空間に面する天井６０の所定位置に配設され、調和空気を供給されてこれを前記室内空間へ吹出す略筒状体の吹出口本体２と、この吹出口本体２内に配設されて調和空気の流路を絞る絞り部３と、この絞り部３上流側に配設されて調和空気の気流を整流する整流用羽根４とを備える構成である。
【００１６】
前記吹出口本体２は、一方の開口端部を閉塞されたアスペクト比の大きい矩形開口断面形状の略筒状体で形成され、室内空間側となる他方の開口端部全周に外方へ所定幅分突出して室内空間に面する額縁部２ａを形成され、天井６０をなす各天井パネル６１とこの額縁部２ａを連結させる一方、天井６０内側の空間部１０で側部にダクト５０を接続されて調和空気を供給され、この調和空気を室内側開口端部から室内空間へ吹出す構成である。
【００１７】
この吹出口本体２の前記絞り部３より下流側となる室内空間寄り所定範囲部分は良熱伝導性の金属製とされ、且つより上流側の部分に対して断熱材５を挟んで一体化していることで断熱状態とされてなり、この室内空間寄り金属部分２ｂの複数箇所に天井６０内側の空間部１０へ通じる横長スリット状の開口孔２ｃが穿設されると共に、開口孔２ｃの上流側位置には空間部１０へ天井面と略平行に突出するフィン２ｄが一体に配設される構成である。前記開口孔２ｃの調和空気流れ方向である上下の開口幅は１０ｍｍとしている。この金属部分２ｂについては、望ましくは鋼やアルミニウム製とする。なお、吹出口本体２の金属部分２ｂ以外の部分は、空間部１０に対し断熱状態となっており、外表面に結露等が発生しないのはいうまでもない。
【００１８】
前記絞り部３は、略板状体で形成され、吹出口本体２の前記他部分における最下流側の内部に開口断面積を上流側端部から下流側端部にかけて徐々に縮小させる形状で且つ絞り流路中心を吹出口本体２の中心と一致させた状態で吹出口本体２に一体に取付けられる構成である。この絞り部３の吹出口本体２開口短辺方向における開口幅は、吹出口本体２の開口幅の４０％分としており、この絞り部３と前記開口孔２ｃとの配置関係を空間部１０からの空気誘引に最適化していることで、調和空気の開口孔２ｃを通じた空間部１０側への流出を防いで吹出口本体２内側への空間部１０空気の流入のみ許容すると共に、調和空気による誘引効率を最大限に高めて吹出口本体２内へ空間部１０空気を十分に導入できる仕組みとなっている。
【００１９】
前記整流用羽根４は、前記絞り部３より上流側の吹出口本体２内に室内空間側に向けて複数枚平行に配設される略板状体であり、ダクト５０から横方向に供給された調和空気が吹出口本体２内を下方に向う過程で偏流している状態を整流し、気流の偏りを無くして気流が一様に室内空間側に向うようにするものである。
【００２０】
次に、前記構成に基づく吹出口装置における冷房時の吹出動作について説明する。ダクト５０から供給される調和空気は横向きに吹出口本体２内に入り、下向きに向きを変えて吹出口本体２内を進んで整流用羽根４を通過する。整流用羽根４では調和空気の偏流状態が解消され、調和空気が吹出口本体２や絞り部３の内周の一部に偏って流れてそのまま室内空間に吹出されるのを防げる。
【００２１】
整流用羽根４から絞り部３に達した調和空気は、絞り部３出口を通って吹出口本体２室内側先端開口から室内空間に吹出されるが、調和空気の気流が絞り部３で速度を速められて噴射されることで、絞り部３の出口周辺にあたる各開口孔２ｃ付近の空気が調和空気の気流に誘引され、これに伴い開口孔２ｃ外側の空間部１０の空気Ｂが吹出口本体２内に吸込まれる状態となる。調和空気を吹出す間、空間部１０の空気Ｂは調和空気の気流に誘引されて各開口孔２ｃを通じ吹出口本体２内に継続して流れ込むこととなる。
【００２２】
この絞り部３から出た調和空気による誘引の際、空間部１０の空気は天井パネル６１及び額縁部２ａとフィン２ｄとの間の領域に入り込み、フィン２ｄに案内されて進むため、開口孔２ｃへスムーズに導入されることとなり、誘引を抵抗無く進行させられ、誘引空気量を十分に確保することができる。また、誘引された空間部１０の空気がフィン２ｄに沿って進むことから、空間部１０の空気からフィン２ｄへ熱が伝わりやすく、さらにこのフィン２ｄからの熱伝導に伴い、吹出口本体２の室内空間寄り金属部分２ｂの温度は空間部１０の温度に近付いていく。
【００２３】
こうして天井６０裏の空間部１０から誘引された気体が流れ込み、吹出口本体２の開口孔２ｃ下流側に沿って室内側に向う暖かい空気の緩やかな気流が発生する（図２参照）。この気流で吹出口本体２の室内空間寄り金属部分２ｂと調和空気の気流との間が温度的に隔離されることとなり、調和空気と金属部分２ｂ間で熱伝達がほとんど行われず、金属部分２ｂは調和空気で冷却されにくいことに加え、フィン２ｄから空間部１０の熱も伝わることで、室内空間の温度に近い状態を維持することができる。
【００２４】
調和空気を一次空気Ａとして吹出口本体２から室内空間に吹出すと、この一次空気Ａにより室内の温かい空気が二次空気Ｃとして誘引され、天井６０付近にも達して吹出口本体２の額縁部２ａやこれに連結する天井パネル６１に接触するが、吹出口本体２の室内空間寄り金属部分２ｂの一部である額縁部２ａやこれと一体化している天井パネル６１は室内空間の温度に近い状態を維持しており、二次空気Ｃはほとんど温度低下することがなく、結露は生じない。一方、吹出される調和空気の周囲には誘引された空間部１０空気の気流が存在し、調和空気と徐々に混合していくことにより、吹出し後の調和空気と室内空間の空気との温度差を小さく抑えられ、下方の居住域でのドラフトを感じにくくすることができる。
【００２５】
このように、本実施の形態に係る吹出口装置では、略筒状の吹出口本体２の室内空間寄りの金属部分２ｂを他の部分に対して断熱状態とすると共に、この金属部分２ｂに天井６０内側の空間部１０へ通じる開口孔２ｃが配設され、開口孔２ｃの上流側には絞り部３と整流用羽根４が配設され、絞り部３を経て速度を速めた調和空気の気流で開口孔２ｃを通じて空間部１０の空気が効率よく誘引され、この誘引空気流が吹出口本体２表面近傍に存在して調和空気と吹出口本体２の室内空間寄り金属部分２ｂとの接触を阻止することから、冷房の場合に、吹出口本体２の金属部分２ｂが冷たい調和空気に熱を奪われることなく室内空間に近い温度を維持し、吹出された調和空気に誘引されて吹出口近傍に達した室内空間内の空気と吹出口本体２の額縁部２ａ等が接触しても、室内の空気を露点まで冷すことがなく、吹出口周囲での結露発生を確実に防止でき、吹出口やその周辺の汚損を防いで美観を維持できると共に、吹出口本体２の断熱構造を簡略化してコストダウンも図れる。
【００２６】
なお、前記実施の形態に係る吹出口装置は、吹出口本体２の開口断面形状がアスペクト比の大きい矩形であるライン型吹出口とする構成としたが、これに限らず、開口断面形状を方形や円形など他の形状に形成する構成とすることもできる。また、ダクト５０を横向きに接続されて調和空気を供給される構成としているが、これに限らず、ダクト５０を上方から接続されて調和空気を下向きに供給される構成とすることもできる。さらに、吹出口配設箇所も天井に限らず、壁でもかまわない。
【００２７】
また、前記実施の形態に係る吹出口装置においては、冷房時に開口孔２ｃを通じて天井６０内側の空間部１０の空気を誘引して室内側に向わせる構成としているが、この他、暖房時については結露の危険性がないことから空間部１０の空気を誘引させない構成とすることもでき、この場合、室内空間側から絞り部３の開口幅や開口の上下方向位置を調整可能な構造とし、冷房時には調和空気の吹出しにより空間部１０の空気を誘引する状態とする一方、暖房時には誘引を伴わずに調和空気を吹出させる状態に切換えるようにして、冷暖房それぞれの場合で最適な吹出し状態を容易に設定できることとなり、冷房時の結露防止性能はそのまま前記実施形態同様としつつ暖房時に天井６０内側の室内空間より冷たい空気を調和空気に混ぜないようにして暖房効率を高められる。
【００２８】
また、前記実施の形態に係る吹出口装置において、吹出口本体２の室内空間寄り所定範囲部分は金属部分２ｂとする構成としているが、冷房時に空間部１０の空気からフィン２ｄを介して吹出口本体２の室内空間寄り部分に熱を伝えなくても十分にこの部分の温度低下を防げ、結露防止が図れる場合、この吹出口本体２の室内空間寄り部分をプラスチック等、金属に比べ低熱伝導率の材料で形成する構成としてもかまわない。さらに、調和空気と室内空気の温度差が小さい、湿度が低いなど、結露がより発生しにくい環境への吹出口設置となる場合は、吹出口本体２のフィン２ｄをより短く形成したり、無くしたりする構成としてもかまわない。
【００２９】
【発明の効果】
以上のように本発明によれば、略筒状の吹出口本体の空気調和対象空間寄り所定範囲部分を他の部分に対して断熱状態とすると共に、この空気調和対象空間寄り部分に天井又は壁の内側空間部へ通じる開口孔が配設され、開口孔の上流側には整流用羽根と絞り部を配設し、吹出口本体に供給された空気調和用気体が整流用羽根で整流された後絞り部を通過し、この絞り部で吹出し範囲を制限されつつ流速を高められることにより、空気調和用気体による開口孔を通じた吹出口本体内への空間部空気の誘引効率を高めて吹出口本体内へ空間部の空気を十分に導入できると共に、整流用羽根で偏流を抑えられ且つ絞り部で吹出し範囲を制限された空気調和用気体が絞り部以降の吹出口本体内周面へ近寄らないこととなり、誘引された空間部の空気を吹出口本体表面近傍に確実に存在させて空気調和用気体と吹出口本体の空気調和対象空間寄り部分との接触を阻止でき、特に冷房の場合に吹出口本体の空気調和対象空間寄り部分の温度低下とこれに伴う結露発生を抑制できるという効果を奏する。また、空間部の空気の吹出口本体内への誘引が整流用羽根より上流側における空気調和用気体流れ状態の影響を受けにくく、吹出口本体とその上流側の空気調和用気体流路との接続関係の制約が少なくなり、吹出口設置の自由度が増すという効果を有する。
【００３０】
また、本発明によれば、吹出口本体の空気調和対象空間寄り部分を良熱伝導性材料製とすると共に、良熱伝導性材料部分に一体化して天井又は壁の内側空間部に突出するフィンが配設され、空間部の熱がフィンを介して吹出口本体に伝わったり、吹出口本体の熱がフィンから空間部に放出されたりする状態が得られることにより、特に冷房の場合、一般に空気調和対象空間より高温である空間部の熱を吹出口本体とその周りにフィンを通じて伝え、吹出口周りの温度を空間部の温度に近付けることができ、吹出口近傍に誘引された空気調和対象空間内の気体と吹出口本体の額縁部等が接触した場合でも、結露をより確実に防止できるという効果を有する。
【００３１】
また、本発明によれば、フィンを開口孔より上流側から空間部に突出配設すると共に、その向きを天井面又は壁面と略平行とし、空間部から開口孔にかけてフィンと天井面又は壁面とに挟まれた領域を吹出口本体内へ誘引される空間部の空気が通過することにより、誘引された空間部の空気がフィンに案内されて開口孔に向けてスムーズに導入されることとなり、誘引量を大きくすることができると共に、誘引された空間部の空気がフィンに沿って進むため、空間部の空気とフィンとの間の熱伝達を促進でき、吹出口本体の良熱伝導性材料部分における温度を空間部の温度により一層近付けられるという効果を有する。
【００３２】
また、本発明によれば、吹出口本体の開口をアスペクト比の大きい矩形状とし、開口孔の開口幅を１０ｍｍに設定すると共に、絞り部の開口幅を吹出口本体開口幅の４０％分として、絞り部と開口孔との配置関係を最適化することにより、空気調和用気体の吹出しに吹出口本体の空気調和対象空間寄り部分が干渉することもなく、誘引の効率を最大限に高めて確実に吹出口本体の内側へ空間部の空気を流入させ、吹出口本体近傍の誘引空気量を十分確保でき、吹出口周囲への結露発生を確実に防止できるという効果を有する。
【図面の簡単な説明】
【図１】本発明の一実施の形態に係る吹出口装置の正面図である。
【図２】本発明の一実施の形態に係る吹出口装置の要部拡大断面図である。
【図３】従来の吹出口装置の要部断面図である。
【図４】従来の他の吹出口装置の縦断面図である。
【符号の説明】
１、１００、２００吹出口装置
２吹出口本体
２ａ、１０１額縁部
２ｂ金属部分
２ｃ開口孔
２ｄフィン
３絞り部
４整流用羽根
５断熱材
１０空間部
５０ダクト
６０天井
６１天井パネル
２０１フランジ部
２０２放熱フィン
２０３開口部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a blowout device that is arranged on a ceiling or a wall surface in a space to be air conditioned and blows out supplied air-conditioning gas toward the air conditioned space, and particularly to a peripheral portion of the blowout during cooling. It is related with the blower outlet apparatus which can prevent dew condensation.
[0002]
[Prior art]
As a part of the air conditioning equipment, various types of blowout apparatuses that blow conditioned air supplied through a duct into an indoor space have been conventionally used depending on the application. Among them, there is a line-type air outlet device that is suitable for use at a specific location such as an inlet / outlet or a perimeter zone, or for an application in which the shape of the air outlet is limited to a narrow width. An example of this conventional line-type outlet device is shown in FIG. FIG. 3 is a cross-sectional view of a main part of a conventional air outlet device.
[0003]
In FIG. 3, the conventional outlet device 100 is arranged on the ceiling 60 and is configured by a substantially box-like body connected to a duct (not shown) and supplied with conditioned air. A frame portion 101 having a predetermined width is disposed around the opening end facing the indoor space, and is connected to a ceiling panel 61 that forms the ceiling 60. In this conventional air outlet device 100, the conditioned air taken in from the duct is blown out in the opening direction or in a predetermined direction guided by the internal guiding means 102, and the conditioned air is appropriately diffused into the indoor space to thereby air in the indoor space. It was in harmony.
[0004]
In this conventional air outlet device, especially when cooling, each part of the air outlet device 100 and the ceiling panel 61 integrated therewith are cooled by the cold conditioned air that is blown out. There is a problem in that dew condensation occurs when warm air in the room directly contacts the frame portion 101 facing the indoor space and the surrounding ceiling panel 61. In order to prevent such dew condensation, conventionally, heat insulation treatment such as flocking the whole surface of the air outlet device 100 or attaching a heat insulating material has been performed, but the structure of the air outlet device 100 is complicated and costly. In addition to the increase in cost, the manufacturing process has become complicated, and there has been a problem in that manufacturing takes time.
[0005]
For this reason, in recent years, air outlet devices have been proposed in which cold conditioned air is kept away from the portions near the ceiling of the air outlet device to prevent cooling of these portions and suppress condensation. As an example of such an outlet device, there is one described in JP-A-2002-295886, which is shown in FIG. FIG. 4 is a longitudinal sectional view of another conventional outlet device.
[0006]
In FIG. 4, another conventional blowout device 200 is configured in a substantially cylindrical body that is disposed on the ceiling 60 and connected to the duct 50 to be supplied with conditioned air. A flange portion 201 is formed on the indoor side of the air outlet device 200, and a plate-like radiating fin 202 is formed near the duct 50, and a slit-like opening is formed on the inner wall between the flange portion 201 and the radiating fin 202. 203 is provided. Through this opening 203, the interior of the air outlet device 200 communicates with the space 10 on the back of the ceiling.
[0007]
In this other conventional air outlet device 200, when the cooling air taken in from the duct 50 is blown out into the indoor space, the air in the space 10 having a higher temperature than the indoor air or the cooling air is attracted from the opening 203. Since the air in the space 10 is fed around the air outlet and forms a high-temperature air layer, it is possible to prevent the cooling air that is blown out from coming into contact with the air outlet and to reduce the surface temperature around the air outlet. Even if warm indoor air attracted as secondary air directly contacts the flange portion 201 facing the indoor space and its surroundings, the indoor air does not cool to the dew point, thus preventing the occurrence of condensation. It is a mechanism.
[0008]
[Problems to be solved by the invention]
The conventional air outlet device is configured as described above. In the latter case, the portion near the ceiling of the air outlet device 200 is not cooled by introducing the induced air from the space portion 10, and the indoor warm air is not cooled by the flange portion 201. However, depending on the setting of the indoor opening width of the air outlet device 200, the slit width of the opening 203, and the connection direction of the upstream duct 50 The problem is that the efficiency of attracting the air in the space 10 by the conditioned air that is blown out deteriorates, the cooling air cannot be partially blocked from coming into contact with the periphery of the air outlet, and it may not be possible to properly prevent condensation. Had.
[0009]
The present invention has been made to solve the above-mentioned problems, and it is possible to reliably induce air in the space portion accompanying the blow-out of the air-conditioning gas to eliminate the influence of the temperature of the air-conditioning gas around the outlet. And it aims at providing the blower outlet apparatus which can prevent generation | occurrence | production of dew condensation by preventing the temperature fall of the part near air conditioning object space.
[0010]
[Means for Solving the Problems]
The air outlet apparatus according to the present invention is disposed at a predetermined position on the ceiling or wall facing the space to be air-conditioned, supplied with air-conditioning gas, and blows out the gas to the air-conditioning target space. In the air outlet apparatus, the air conditioner gas is formed in a substantially cylindrical body, and the predetermined range portion of the substantially cylindrical body near the air conditioning target space is insulative with respect to the upstream portion of the predetermined range portion. And a throttle arranged in a shape that gradually reduces the opening cross-sectional area from the upstream end to the downstream end inside the most downstream side of the upstream portion of the outlet body. A rectifying blade that is disposed inside the outlet main body upstream of the throttle portion and rectifies the supplied air-conditioning gas and uniformly moves toward the air-conditioning target space. The air outlet body is the air conditioning target air A frame portion that is provided with an opening hole leading to a space portion existing inside the ceiling or wall at one or a plurality of positions close to the predetermined range, and protrudes by a predetermined width around the opening end portion on the air conditioning target space side The frame portion is in a state of facing the air conditioning target space, and the air in the space portion is attracted to the air flow of the air conditioning gas blown out through the throttle portion through the opening hole. In addition, an air flow induced by the air in the space portion is generated in the vicinity of the inner peripheral surface on the downstream side of the opening hole of the outlet body.
[0011]
As described above, in the present invention, the predetermined range portion near the air conditioning target space of the substantially cylindrical air outlet body is insulative with respect to other portions, and the portion closer to the air conditioning target space is located inside the ceiling or the wall. An opening hole leading to the space portion is provided, and a rectifying blade and a restricting portion are provided on the upstream side of the opening hole, and the air-conditioning gas supplied to the outlet body is rectified by the rectifying blade and then the restrictor The air flow rate is increased while the blowout range is limited by this throttle part, so that the efficiency of attracting the space part air into the blower outlet body through the opening hole by the air-conditioning gas is increased, and the inside of the blower outlet body The air in the space can be sufficiently introduced to the air, and the air-conditioning gas whose flow is suppressed by the rectifying blades and whose blowing range is restricted by the restricting part will not approach the inner peripheral surface of the outlet body after the restricting part. The air in the space that was attracted It can be surely present in the vicinity of the air outlet body surface to prevent contact between the air conditioning gas and the portion of the air outlet body near the air-conditioning target space. It is possible to suppress the reduction and the resulting condensation. In addition, the attraction of the air in the air outlet into the air outlet main body is not easily affected by the air conditioning gas flow state upstream of the rectifying blades, and the air outlet gas flow path between the air outlet main body and the air conditioning gas flow path upstream of the air outlet Connection restrictions are reduced, and the degree of freedom in installing the outlet is increased.
[0012]
Further, in the blowout device according to the present invention, if necessary, the blowout body has a predetermined range portion close to the air conditioning target space made of a good heat conductive material, and the good heat conductive material portion. It has fins that are integrally connected and capable of transferring heat and project into the space.
As described above, in the present invention, the portion near the air conditioning target space of the outlet body is made of a highly heat conductive material, and the fin that is integrated with the good heat conductive material portion and protrudes into the inner space portion of the ceiling or wall. Is provided, and heat in the space is transmitted to the air outlet body through the fins, or heat in the air outlet body is released from the fins to the space, so that air is generally used, particularly in the case of cooling. Air in the air-conditioning target space that is attracted to the vicinity of the air outlet, allowing the heat of the space higher than the air to be conditioned to be transmitted to the air outlet body and its surroundings through the fins, allowing the temperature around the air outlet to approach the temperature of the space. Condensation can be prevented more reliably even when the gas inside and the frame portion of the outlet body contact each other.
[0013]
Further, in the air outlet device according to the present invention, if necessary, the fin is provided on a ceiling surface or a wall surface from a predetermined location upstream of the opening hole in the good heat conductive material portion of the air outlet body to the space portion. And are arranged so as to be substantially parallel to each other.
As described above, in the present invention, the fins are provided so as to protrude from the upstream side of the opening hole into the space portion, the direction thereof is substantially parallel to the ceiling surface or the wall surface, and the fin and the ceiling surface or wall surface are formed from the space portion to the opening hole. When the air in the space portion that is attracted into the air outlet body passes through the region sandwiched between the air, the air in the attracted space portion is guided by the fins and smoothly introduced toward the opening hole, The amount of attraction can be increased, and the air in the attracted space travels along the fins, so heat transfer between the air in the space and the fins can be promoted, and the heat conductive material of the outlet body The temperature in the part is made closer to the temperature in the space part.
[0014]
In addition, in the air outlet apparatus according to the present invention, the air outlet main body has an opening closer to the air-conditioning target space as a rectangular shape having a large aspect ratio, and the opening hole in the air-conditioning gas flow direction as necessary. The opening width is 10 mm, and the opening width of the narrowed portion in the direction of the short side of the outlet body opening is about 40% of the opening width of the outlet body.
As described above, in the present invention, the opening of the outlet body has a rectangular shape with a large aspect ratio, the opening width of the opening hole is set to 10 mm, and the opening width of the throttle portion is 40% of the opening width of the outlet body. By optimizing the arrangement relationship between the throttle part and the opening hole, the efficiency of the attraction is maximized without interfering with the air conditioning target space near the air conditioning target space of the air conditioning gas The air in the space portion can be surely flowed into the inside of the outlet body, the amount of induced air in the vicinity of the outlet body can be secured sufficiently, and the occurrence of condensation around the outlet can be reliably prevented.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an air outlet apparatus according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. In addition, in this Embodiment, the example at the time of the cooling of the line type blower outlet apparatus arrange | positioned on a ceiling is shown. FIG. 1 is a front view of the air outlet device according to the present embodiment, and FIG. 2 is an enlarged cross-sectional view of the main part of the air outlet device according to the present embodiment.
As shown in the respective drawings, the air outlet device 1 according to the present embodiment is disposed at a predetermined position of a ceiling 60 facing an indoor space to be air conditioned, supplied with conditioned air, and A substantially cylindrical air outlet body 2 that blows out into the space, a throttle part 3 that is arranged in the air outlet body 2 and restricts the flow path of the conditioned air, and is arranged upstream of the throttle part 3 in harmony. It is a structure provided with the rectification | straightening blade | wing 4 which rectifies | straightens the airflow.
[0016]
The blower outlet body 2 is formed of a substantially cylindrical body having a rectangular opening cross-sectional shape with a large aspect ratio with one opening end closed, and is predetermined outwardly around the other opening end on the indoor space side. A frame portion 2 a that protrudes by the width and faces the indoor space is formed, and each ceiling panel 61 that forms the ceiling 60 is connected to the frame portion 2 a, while the duct 50 is connected to the side portion in the space portion 10 inside the ceiling 60. The conditioned air is supplied, and the conditioned air is blown out from the indoor opening end to the indoor space.
[0017]
A predetermined range portion closer to the indoor space on the downstream side of the throttle portion 3 of the air outlet body 2 is made of a metal having good heat conductivity, and is integrated with the heat insulating material 5 with respect to the upstream portion. As a result, a horizontally elongated opening 2c leading to the space 10 on the inside of the ceiling 60 is formed at a plurality of locations on the metal portion 2b closer to the indoor space, and the upstream side of the opening 2c. In the position, fins 2 d that protrude into the space 10 substantially parallel to the ceiling surface are integrally disposed. The upper and lower opening width in the direction of the conditioned air flow of the opening hole 2c is 10 mm. The metal portion 2b is preferably made of steel or aluminum. In addition, it goes without saying that portions other than the metal portion 2b of the air outlet body 2 are insulative with respect to the space portion 10, and no dew condensation occurs on the outer surface.
[0018]
The throttle portion 3 is formed in a substantially plate-like body, and has a shape that gradually reduces the opening cross-sectional area from the upstream end portion to the downstream end portion inside the most downstream side of the other portion of the outlet body 2. In this configuration, the throttle channel center is integrally attached to the outlet body 2 in a state where the center of the throttle channel coincides with the center of the outlet body 2. The opening width of the throttle part 3 in the direction of the short side of the outlet body 2 is 40% of the opening width of the outlet body 2, and the arrangement relationship between the throttle part 3 and the opening hole 2 c is determined from the space part 10. By optimizing the air attraction, the flow of the conditioned air to the space 10 side through the opening 2c is prevented, and only the inflow of the space 10 into the air outlet body 2 is allowed. The structure is such that the space 10 air can be sufficiently introduced into the outlet body 2 with the maximum attraction efficiency.
[0019]
The rectifying blades 4 are substantially plate-like bodies arranged in parallel toward the indoor space in the air outlet body 2 upstream of the throttle portion 3 and are supplied from the duct 50 in the lateral direction. The state in which the conditioned air is drifting in the process of moving downward in the outlet body 2 is rectified to eliminate the bias of the air flow so that the air flow is directed uniformly toward the indoor space.
[0020]
Next, the blowing operation at the time of cooling in the outlet device based on the above configuration will be described. The conditioned air supplied from the duct 50 enters the air outlet body 2 sideways, turns downward, travels through the air outlet body 2 and passes through the rectifying blades 4. The rectifying blade 4 eliminates the conditioned air drift state and prevents the conditioned air from being biased to a part of the inner periphery of the outlet body 2 and the throttle 3 and being blown out into the indoor space.
[0021]
The conditioned air that has reached the throttle unit 3 from the rectifying blades 4 is blown out through the outlet of the throttle unit 3 to the indoor space from the opening on the indoor side of the outlet body 2. By being accelerated and injected, the air in the vicinity of each opening hole 2c, which is around the outlet of the throttle portion 3, is attracted to the airflow of conditioned air, and the air B in the space portion 10 outside the opening hole 2c is accompanied by this. 2 will be inhaled. While the conditioned air is blown out, the air B in the space 10 is attracted by the air flow of the conditioned air and continuously flows into the outlet body 2 through the respective opening holes 2c.
[0022]
At the time of attraction by the conditioned air exiting from the throttle portion 3, the air in the space portion 10 enters the area between the ceiling panel 61 and the frame portion 2a and the fin 2d and is guided by the fin 2d, so that the opening 2c It will be smoothly introduced, the attraction can proceed without resistance, and a sufficient amount of attraction air can be secured. Further, since the air in the space portion 10 that has been attracted travels along the fins 2d, heat is easily transferred from the air in the space portion 10 to the fins 2d. Further, along with the heat conduction from the fins 2d, the air outlet body 2 The temperature of the metal portion 2b closer to the indoor space approaches the temperature of the space portion 10.
[0023]
In this way, the gas attracted from the space part 10 behind the ceiling 60 flows, and a gentle air current of warm air is generated along the downstream side of the opening 2c of the outlet body 2 toward the indoor side (see FIG. 2). With this airflow, the space between the metal portion 2b close to the indoor space of the air outlet body 2 and the airflow of the conditioned air is thermally isolated, so that almost no heat transfer is performed between the conditioned air and the metal portion 2b, and the metal portion 2b. In addition to being hard to be cooled by conditioned air, the heat of the space 10 is also transmitted from the fins 2d, so that a state close to the temperature of the indoor space can be maintained.
[0024]
When conditioned air is blown into the indoor space from the outlet body 2 as the primary air A, the warm air in the room is attracted as the secondary air C by the primary air A and reaches the vicinity of the ceiling 60 to reach the frame of the outlet body 2 The frame portion 2a, which is part of the metal portion 2b near the interior space of the outlet body 2, and the ceiling panel 61 integrated therewith are brought into contact with the temperature of the interior space. The close state is maintained, the temperature of the secondary air C hardly decreases, and no condensation occurs. On the other hand, there is an air flow of the space 10 that has been attracted around the conditioned air that is blown out, and by gradually mixing with the conditioned air, a temperature difference between the conditioned air after blowing and the air in the indoor space. Can be kept small, making it difficult to feel the draft in the lower living area.
[0025]
As described above, in the air outlet device according to the present embodiment, the metal portion 2b near the indoor space of the substantially cylindrical air outlet body 2 is insulative with respect to the other portions, and the metal portion 2b has a ceiling. 60 is provided with an opening hole 2c leading to the space 10 inside, and a throttle part 3 and a rectifying blade 4 are provided upstream of the opening hole 2c, and the flow rate of conditioned air is increased through the throttle part 3. Thus, the air in the space 10 is efficiently attracted through the opening 2c, and this induced air flow is present in the vicinity of the surface of the air outlet body 2 to prevent contact between the conditioned air and the metal portion 2b closer to the interior space of the air outlet body 2. Therefore, in the case of cooling, the metal portion 2b of the air outlet body 2 maintains a temperature close to the indoor space without taking heat away from the cold conditioned air, and is attracted to the conditioned air blown out and near the air outlet. Reached the air in the indoor space and the outlet body 2 Even if the edge 2a or the like comes into contact, the indoor air is not cooled to the dew point, it is possible to reliably prevent the formation of dew around the outlet, and maintain the aesthetics by preventing contamination of the outlet and its surroundings. The heat insulating structure of the outlet body 2 can be simplified to reduce the cost.
[0026]
In addition, although the blower outlet apparatus which concerns on the said embodiment was set as the structure which is the line type blower outlet whose opening cross-sectional shape of the blower outlet main body 2 is a rectangle with a large aspect ratio, it is not restricted to this but an opening cross-sectional shape is square. It can also be set as the structure formed in other shapes, such as a circle. In addition, the duct 50 is connected sideways to supply conditioned air. However, the configuration is not limited thereto, and the duct 50 may be connected from above to supply conditioned air downward. Furthermore, the location of the air outlet is not limited to the ceiling, and may be a wall.
[0027]
Further, in the air outlet apparatus according to the embodiment, the air in the space portion 10 inside the ceiling 60 is attracted and directed toward the indoor side through the opening hole 2c at the time of cooling. Since there is no risk of condensation, it can also be configured not to attract the air in the space 10, in this case, the opening width of the throttle portion 3 and the vertical position of the opening can be adjusted from the indoor space side, While cooling, the air in the space 10 is attracted by blowing out the conditioned air, while in heating, the state is switched to the state in which conditioned air is blown out without attraction, so that the optimum blowing state can be easily achieved in each case of cooling and heating. The dew condensation prevention performance during cooling is the same as in the above embodiment, and air that is cooler than the indoor space inside the ceiling 60 is not mixed with conditioned air during heating. It is to increase the heating efficiency.
[0028]
Further, in the air outlet apparatus according to the embodiment, the predetermined range portion closer to the indoor space of the air outlet body 2 is configured to be the metal portion 2b, but the air outlet from the air of the space portion 10 through the fins 2d during cooling. If it is possible to prevent the temperature drop of this part and prevent condensation without transferring heat to the part of the main body 2 closer to the indoor space, the part of the outlet body 2 closer to the indoor space has a lower thermal conductivity than that of metal such as plastic. A structure formed of any of the above materials may be used. Furthermore, when the air outlet is installed in an environment where condensation is less likely to occur, such as when the temperature difference between the conditioned air and the room air is small or the humidity is low, the fin 2d of the air outlet body 2 is formed shorter or eliminated. It does not matter even if it is a structure to do.
[0029]
【The invention's effect】
As described above, according to the present invention, the predetermined range portion near the air-conditioning target space of the substantially cylindrical outlet body is insulative with respect to other portions, and the ceiling or wall is placed on the portion near the air-conditioning target space. An opening hole leading to the inner space of the air outlet is disposed, a rectifying blade and a throttle portion are disposed upstream of the opening hole, and the air-conditioning gas supplied to the outlet body is rectified by the rectifying blade. By passing through the rear restrictor, the flow rate can be increased while restricting the blowout range at this restrictor, thereby increasing the efficiency of attracting the space part air into the outlet body through the opening hole by the air conditioning gas. Air in the space can be sufficiently introduced into the main body, and the air-conditioning gas, whose drift is suppressed by the rectifying blades and whose blowing range is restricted by the throttle, does not approach the inner peripheral surface of the outlet body after the throttle The air in the space that was attracted It can be surely present in the vicinity of the air outlet body surface to prevent contact between the air conditioning gas and the portion of the air outlet body near the air-conditioning target space. There is an effect that it is possible to suppress the reduction and the accompanying dew condensation. In addition, the attraction of the air in the air outlet into the air outlet main body is not easily affected by the air conditioning gas flow state upstream of the rectifying blades, and the air outlet gas flow path between the air outlet main body and the air conditioning gas flow path upstream of the air outlet There is an effect that restrictions on connection relations are reduced and the degree of freedom in installing the outlet is increased.
[0030]
Further, according to the present invention, the portion of the air outlet body closer to the air-conditioning target space is made of a highly heat conductive material, and the fin is integrated with the good heat conductive material portion and protrudes into the inner space portion of the ceiling or wall. Is provided, and heat in the space is transmitted to the air outlet body through the fins, or heat in the air outlet body is released from the fins to the space, so that air is generally used, particularly in the case of cooling. Air in the air-conditioning target space that is attracted to the vicinity of the air outlet, allowing the heat of the space higher than the air to be conditioned to be transmitted to the air outlet body and its surroundings through the fins, allowing the temperature around the air outlet to approach the temperature of the space. Even when the gas inside and the frame portion of the blowout outlet body come into contact with each other, there is an effect that condensation can be more reliably prevented.
[0031]
In addition, according to the present invention, the fin is provided to protrude from the upstream side of the opening hole into the space portion, the direction thereof is substantially parallel to the ceiling surface or the wall surface, and the fin and the ceiling surface or wall surface are extended from the space portion to the opening hole. When the air in the space portion that is attracted into the air outlet body passes through the region sandwiched between the air, the air in the attracted space portion is guided by the fins and smoothly introduced toward the opening hole, The amount of attraction can be increased, and the air in the attracted space travels along the fins, so heat transfer between the air in the space and the fins can be promoted, and the heat conductive material of the outlet body There is an effect that the temperature in the portion can be made closer to the temperature of the space portion.
[0032]
Further, according to the present invention, the opening of the outlet body has a rectangular shape with a large aspect ratio, the opening width of the opening hole is set to 10 mm, and the opening width of the throttle portion is 40% of the opening width of the outlet body. By optimizing the arrangement relationship between the throttle part and the opening hole, the efficiency of the attraction is maximized without interfering with the air conditioning target space near the air conditioning target space of the air conditioning gas The air in the space is surely introduced into the inside of the air outlet body, and the amount of attracted air in the vicinity of the air outlet body can be sufficiently secured, so that the dew condensation around the air outlet can be reliably prevented.
[Brief description of the drawings]
FIG. 1 is a front view of an air outlet device according to an embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view of a main part of the air outlet device according to the embodiment of the present invention.
FIG. 3 is a cross-sectional view of a main part of a conventional air outlet device.
FIG. 4 is a longitudinal sectional view of another conventional outlet device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1,100,200 Outlet apparatus 2 Outlet body 2a, 101 Frame part 2b Metal part 2c Opening hole 2d Fin 3 Restriction part 4 Vane for rectification 5 Heat insulating material 10 Space part 50 Duct 60 Ceiling 61 Ceiling panel 201 Flange part 202 Heat radiation Fin 203 opening

Claims

In the air outlet device that is disposed at a predetermined position on the ceiling or wall facing the space to be air conditioned, is supplied with air conditioning gas and blows the gas to the air conditioning space,
The blower is formed of a substantially cylindrical body to which the air-conditioning gas is supplied, and a predetermined range portion of the substantially cylindrical body near the air-conditioning target space is insulative with respect to a portion upstream of the predetermined range portion. An exit body;
A throttle portion disposed as a shape that gradually reduces the opening cross-sectional area from the upstream end portion to the downstream end portion in the most downstream side in the upstream portion of the outlet body,
A rectifying blade disposed inside the outlet body upstream of the throttle and rectifying the supplied air-conditioning gas so as to be uniformly directed toward the air-conditioning target space;
The air outlet main body is provided with an opening hole leading to a space portion existing inside the ceiling or the wall at one or a plurality of positions near the air conditioning target space, and an opening on the air conditioning target space side. A frame portion that protrudes by a predetermined width around the end portion is formed, and the frame portion is in a state facing the air conditioning target space,
The air in the space portion is attracted to the air flow of the air-conditioning gas blown out through the throttle portion through the opening hole, and the space portion is located in the vicinity of the inner peripheral surface on the downstream side of the opening hole of the outlet body. A blowout device characterized in that an air-induced airflow is generated.

In the blower outlet device according to claim 1,
The air outlet main body is made of a highly heat conductive material in a predetermined range near the air-conditioning target space, and is connected to the good heat conductive material portion and is capable of transferring heat. An air outlet device having a fin projecting into a space.

In the blower outlet device according to claim 2,
The air blower is characterized in that the fin is provided to project from the predetermined portion upstream of the opening hole in the good heat conductive material portion of the air outlet body to the space portion so as to be substantially parallel to the ceiling surface or the wall surface. Exit device.

In the blower outlet device according to any one of claims 1 to 3,
The blower outlet body has an opening closer to the air conditioning target space having a rectangular shape with a large aspect ratio, and an opening width in the air conditioning gas flow direction of the opening hole is 10 mm,
The blower outlet device characterized in that the opening width of the narrowed portion in the direction of the short side of the blower outlet body opening is about 40% of the opening width of the blower outlet body.