JP3937585B2 - Tunnel type high frequency continuous furnace - Google Patents

Tunnel type high frequency continuous furnace Download PDF

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Publication number
JP3937585B2
JP3937585B2 JP15907998A JP15907998A JP3937585B2 JP 3937585 B2 JP3937585 B2 JP 3937585B2 JP 15907998 A JP15907998 A JP 15907998A JP 15907998 A JP15907998 A JP 15907998A JP 3937585 B2 JP3937585 B2 JP 3937585B2
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Japan
Prior art keywords
tunnel
frequency
absorber
high frequency
type high
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JP15907998A
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Japanese (ja)
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JPH11354268A (en
Inventor
治男 松島
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Panasonic Corp
Panasonic Holdings Corp
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Panasonic Corp
Matsushita Electric Industrial Co Ltd
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Priority to JP15907998A priority Critical patent/JP3937585B2/en
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Description

【0001】
【発明の属する技術分野】
本発明は大量の冷凍食品の解凍等を行うトンネル式高周波連続炉の改良に関する。
【0002】
【従来の技術】
食品を扱う工場では衛生に関して厳しい管理が必要であり、トンネル式高周波連続炉も衛生管理の最低要求として清掃の容易性が求められ、さらに清掃に用いた水や内部の結露で生じた水が食品上に落下しない構造である事が要求される。また同時にトンネル炉のキーテクノロジーであるトンネル部分は高周波漏洩防止性能が優れている事は当然として、大きな食品が通過できる事、トンネルの高さが1mmでも大きい事が要求されるが、前者の食品の上に水が落下しない要求は往々にして後者のトンネル高さを圧迫する。
【0003】
トンネル内側には一般的に高周波吸収体等が収納されているから天面は誘電体の板で被われる。一方、高周波が照射されるキャビティの壁面は金属であるから両者の一体化は不可能であり、従って何らかの方法で両者を接合しなければならない。この金属壁面と天面の誘電体板との接合部はベルトの上を横切るからトンネル内部に侵入した水あるいは結露等内部で発生した水はこの接合部からベルトに載置された食品上に落下しかねない。これを防止するには接合部の下に樋を設けなければならず、その分トンネル高さが小さくなってしまうのである。
【0004】
トンネル高さ拡大に関するテクノロジーも種々特許出願されているが、主流の水等の高周波吸収液体をトンネル内部に導入する方法は大規模化が免れないと共に上下水道費用、設備工事および水垢、湯垢の除去メンテナンスが必要となる。
【0005】
水を用いない方法としてはUSP4、182、946号に針山方式が開示され、USP4、488、027号ではチョークとフェライトとの2段構成が、さらには実開昭54−178149号にはコンベアの出入口にリアクタンス素子型フィルターと高周波吸収体とを交互に並べる等の技術が出願されている。しかしこれらには上記水滴落下対策は全く触れられてなく、また流水を用いる方法では容易であった熱交換の視点が欠落している。これら未解決、ブレイクスルーすべき技術課題があり、そのままでは実用できないと共に、設計的解決をしようにも主旨の高周波漏洩防止も原理説明はもとより機構説明、具体的効果等の開示がほとんど無く、それでなくとも種々の制約が課せられる領域である事とも相まって、それも不可能であった。
【0006】
【発明が解決しようとする課題】
上記従来技術の課題を整理すると次のようになる。
【0007】
(1)コンベア上への水滴落下対策が無い。または対策を施すとトンネル高さがその分低くなる。
【0008】
(2)上下水道設備等の工事を必要とせず、ランニングコストが低く、小型簡単で安価に構成できるトンネルが求められている。
【0009】
(3)水を用いずに高周波吸収体の熱を交換する手段が求められている。
【0010】
【課題を解決するための手段】
本発明は上記課題(1)を解決する為、キャビティと、コンベアベルトと、キャビティのコンベアベルト貫通口に設けられたトンネル式高周波漏洩防止装置とを有し、トンネル式高周波漏洩防止装置のトンネル内側天面は、この天面と平行な底面と、トンネル出入口で上に延びる樋形状を有し、コンベアベルトの有効載置域外に樋の終端を設けたフィルム状誘電体で保持された構成であり、その終端がコンベアベルトの有効載置域外に位置する為、トンネル内部に侵入した水あるいは内部で結露等により発生した水はベルト上の食品上に落下しない。
【0011】
また本発明は上記課題(2)を解決する為、キャビティと、コンベアベルトと、キャビティのコンベアベルト貫通口に設けられたトンネル式高周波漏洩防止装置とを有し、トンネル式高周波漏洩防止装置は水平偏波フィルターと水平高周波吸収体とをコンベア走行方向に対し複数回交互に並べた構成であり、水平偏波フィルターによりトンネル内は水平の波のみ通過し、水平高周波吸収体により吸収され、これが交互に設けられているので水平高周波吸収体通過時に発生した垂直波は次の水平偏波フィルターで再び水平波のみ通過し、続く水平高周波吸収体で再び効率良く吸収される。従って水を用いない簡単で安価なトンネルが実現できる。
【0012】
さらに本発明は上記課題(3)を解決する為、キャビティと、コンベアベルトと、キャビティのコンベアベルト貫通口に設けられたトンネル式高周波漏洩防止装置とを有し、トンネル式高周波漏洩防止装置は金属製の直方体およびその内部に設けられた複数個の高周波吸収体とを有し、高周波吸収体は前記金属直方体の壁面に開けられたスリットに嵌合した複数の誘電体板に保持され、少なくともキャビティに最も近い位置の高周波吸収体を保持する誘電体板はベルトの走行方向に対し直角に設けられた平行な複数枚であり、この複数枚で構成される領域に面する金属直方体の左右側面壁には通風用小孔群を設けた構成であり、この通風用小孔群の一方からファンモーター等で風を導入すれば平行な複数枚の誘電体板がエアーガイドとなり、高周波吸収体を冷却した後他方の通風用小孔群から外部へ排出され、高周波吸収体の排熱あるいは熱交換ができる。
【0013】
【発明の実施の形態】
本発明はキャビティと、コンベアベルトと、キャビティのコンベアベルト貫通口に設けられたトンネル式高周波漏洩防止装置とを有し、トンネル式高周波漏洩防止装置のトンネル内側天面は、この天面と平行な底面と、トンネル出入口で上に延びる樋形状を有し、コンベアベルトの有効載置域外に樋の終端を設けたフィルム状誘電体で保持されたものであり、一端はキャビティ内部でビス止め固定され、他端はバネを介して引っ張り状態で固定され、中央部はトンネルの天面下端となり、樋の終端はコンベアベルトの載置領域外に位置する為、トンネル内部に侵入した水あるいは内部で結露等により発生した水はベルト上の食品上に落下しないと言う効果を有する。
【0014】
また本発明トンネル式高周波漏洩防止装置は水平偏波フィルターと水平高周波吸収体とをコンベア走行方向に対し複数回交互に並べた構成であり、水平偏波フィルターとして1/4波長程度の長さの金属ビス群を用い、これによりトンネル内は水平の波のみ通過し、水平高周波吸収体として水平に置かれたフェライト板を用い、これにより水平の波が吸収され、これが交互に設けられているので水平高周波吸収体通過時に発生した垂直波は次の水平偏波フィルターで再び水平波のみとなり、続く水平高周波吸収体で再び効率良く吸収される。従って水を用いない簡単で安価なトンネルが実現できると言う効果を有する。
【0015】
さらに本発明水平偏波フィルターは針山群で構成され、キャビティに最も近い位置の水平偏波フィルターコンベア走行方向に対し1/4波長以上の長さを有し、二つ目以降の水平偏波フィルターは横1列の針で構成したものであり、針として1/4波長程度の金属ビスを用い、水平高周波吸収体として水平に置かれたフェライト板を用いる。二つ目以降のフィルターが横1列の針であるから短い範囲に幾重設ける事が可能となり、小型、安価に作る事が可能となる。
【0016】
さらにまた本発明トンネル式高周波漏洩防止装置は金属製の長方形筒およびその内部に設けられた複数個の高周波吸収体から成り、高周波吸収体は前記金属長方形筒の壁面に開けられたスリットに嵌合した複数の誘電体板に保持された構成であり、誘電体としてガラスクロス積層板を用い、金属壁面のスリットの寸法より若干小さい鍵型嵌合部および高周波吸収体の断面形状より若干大きい孔とで高周波吸収体を保持するものであり、簡単かつ安価に構成できると言う効果を有する。
【0017】
また本発明トンネル式高周波漏洩防止装置は金属製の直方体およびその内部に設けられた複数個の高周波吸収体とを有し、高周波吸収体は前記金属直方体の壁面に開けられたスリットに嵌合した複数の誘電体板に保持され、少なくともキャビティに最も近い位置の高周波吸収体を保持する誘電体板はベルトの走行方向に対し直角に設けられた平行な複数枚であり、この複数枚で構成される領域に面する金属直方体の左右側面壁には通風用小孔群を設けた構成であり、この通風用小孔群の一方からファンモーター等で風を導入すれば平行な複数枚の誘電体板がエアーガイドとなり、高周波吸収体を冷却した後他方の通風用小孔群から外部へ排出され、高周波吸収体の排熱あるいは熱交換ができると言う効果を有する。
【0018】
【実施例】
以下図面に基づいて一実施例を説明する。
【0019】
図1は本発明のトンネル式高周波連続炉の側面図である。左が食品投入側、右が加熱食品排出側である。投入側トンネル1の上には操作部2、下にはベルト機構3および清掃用取り外し窓4が有る。中央には上に三つの天面カバー5、6および7が、中間部には二つの側面カバー8および9が、下部には五つの機械室10、11、12、13および14があり、右には排出側トンネル15およびその下にベルト駆動機構16および清掃用取り外し窓17がある。底面部にはキャスター18および19と、アジャスタボルト20および21があり、これらの左右に汁受皿22、23、24および25とがある。
【0020】
図2は排出側トンネル15の断面図である。キャビティの側壁26には横長の開口27が開けられ、この周囲のキャビティ外側にはトンネル外壁上28と、トンネル外壁下29とで形成される長方形筒の左端は上下左右フランジを開口27周囲のキャビティ側壁26にビス30および31で固定し、右端は終端カバー32で被われる。長方形筒の上下平面には左端から5列、金属ビス33をナット34で先端がトンネル内部を向く様に固定する。隣にはガラスクロス積層板製の吸収体取り付け板横大352枚がトンネル外壁上28および同下29に開けられたスリット36(図3に図示する。)に挿入、嵌合され固定され、吸収体取り付け板横底37との組み合わせにより一種の角筒が形成され、この角筒内に高周波吸収体大38を保持する。吸収体取り付け板横小36二枚は高周波吸収体大38相互間および上下の位置規制の役目を持つ。トンネル外壁上28の側面には通風用小孔群39を開け、二枚の吸収体取り付け板大35の位置と一致させる。つまり吸収体大38が保持される角筒の両端が通風用小孔群と結合され、角筒はエアーガイドの機能を持つわけである。
【0021】
その隣、トンネル外壁上28の上面には1列のビス40が同じくナット止めされ、さらにその隣にはガラスクロス積層板製の四つのスリットが開いた吸収体取り付け板縦孔41および同スリット無しの吸収体取り付け板縦42とが孔有2対孔無1の比率で固定され、取り付け板縦孔41に開けられたスリット大43には高周波吸収体大38が、スリット小44には高周波吸収体小45が挿入され、スリト無しの取り付け板縦42によりスリット43、44からの落下が防止される。さらにトンネル外壁上の上面には四つの高周波吸収体38および45の間に各々1列のビス46、47、および48がナット止めされる。
【0022】
基本的に図2は上下対称であり、唯一の相違は上面にはバネ49に引っ張られたフィルム50が有る事であり、フィルム50の左端は金具51と前記キャビティ側壁26とでサンドイッチされ、前記ビス30で共締めされる。トンネル外壁上の側面中央には断面コの字型の側面支持金具52が固定され、その上下のフランジはガラスクロス積層板製のトンネルカバー53の左右端を保持する。
【0023】
図3(A)は排出側トンネル15を上から見た平面図および(B)は排出側から見た側面図であり、終端カバー32は取り外した状態である。(A)の平面図に於いてバネ49はビス46で固定された金具54と、これと類似形状の金具55との両方に開けられた小孔間に引っかけられ、フィルム50の終端は金具55と前述の金具51と同一形状の金具とでサンドイッチされる。上部には前述のスリット36が横2列に並び、その内側にスリット56が同じく横2列に並ぶ。スリット36および56は前記収体取り付け板横大35および吸収体取り付け板横小36の鍵状部分57(図に図示する)と嵌合する。中央部の縦に開いたスリット58および59は各々前記吸収体取り付け板縦孔41および吸収体取り付け板縦42の鍵状部と嵌合する。図の左右にあって上下に延びる2点鎖線はコンベアベルト60の端であり、共にフィルム50の左右端の外側に位置する。(B)の側面図には吸収体取り付け板縦孔41二枚に高周波吸収体小45一つが保持され、吸収体取り付け板縦42が左右の位置規制を担っている事が描かれ、両者吸収体取り付け板41および同42の上にトンネルカバー53が載り、左右端を断面コの字型の側面支持金具52のフランジが押さえている様子が描かれている。前述した如くトンネル内部はフィルム50以外は上下対称であり、従ってトンネルカバー53はフィルム50の上に保持される。
【0024】
図4は吸収体取り付け板横大35、吸収体取り付け板横小36、吸収体取り付け板横底37および高周波吸収体38の関係を表す図であり、(A)は角筒またはエアーガイドとして組み合わせた状態を上から見た平面図、(B)は同側面図、(C)は吸収体取り付け板横小36の正面図、(D)は吸収体取り付け板横底37の平面図、(E)は吸収体取り付け板横大35の正面図である。吸収体取り付け板横大35下部のスリット61に吸収体取り付け板横底37の鍵部62を挿入し、略U字形状を作り、前記鍵部57を前記スリット36に挿入後、図示する矢印方向に移動させ、鍵57とスリット36を嵌合させる。鍵部62は前記鍵部57と形状は同一であるが鍵の方向が反対である。吸収体取り付け板横小36の突起63は高周波吸収体大38の左右端位置決めとなる。
【0025】
図5(A)は吸収体取り付け板縦孔41の正面図、(B)は吸収体取り付け板縦42の正面図である。両者にも鍵部57を設ける。この鍵部を除いた高さHは両者同一であり、また図4(E)の吸収体取り付け板横大35も同一の高さである。図6(A)はフィルム50の取り付けられた状態の平面図および2点鎖線は取り付けられる前のフィルムの平面図であり、両端に一列に並んだ孔は前記金具51および55取り付け用である。(B)は同側面図であり、2点鎖線で描いたのはトンネルカバー53である。図を見ればフィルム50が樋形状である事が理解されよう。
【0026】
次に作用を説明する。図6に示す如くフィルム50は一種の樋であり、これが前述の長方形筒の両端面および内部天面を被い、樋の端面がコンベアベルトの外に位置するので清掃時にトンネル内部に侵入した水や、結露により内部に発生した水は樋の端から落下し、ベルト上には落下しない。なお、本実施例としてフィルムは薄いフィルム状誘電体として厚さ約180ミクロンのポリエステルフィルムを用いた。
【0027】
図2や図3(B)からも明かな様に、長方形筒であるトンネルは一種の矩形導波管であり、従って主姿態モードは垂直方向の電界を有すると考えられる。しかるに図2に示す如く針山を構成するビス33、40等は垂直方向を向いている。電磁気学の初歩知識から電界は金属と垂直方向を向くから針山の存在により角筒内部の電界は水平となる。つまり針山は水平偏波フィルターとして機能する訳である。ビス33よりなる針山に隣接して平板である高周波吸収体大38が水平方向にかつ針山の先端付近まで浮かせた状態で固定されている。これも電磁気学の初歩知識により電界と吸収体とが互いに直角の場合はあまり吸収されないが平行の場合は良く吸収されるから水平偏波フィルターに隣接して水平に置かれた高周波吸収体はフィルター通過後の水平波を良く吸収する。いわば水平偏波吸収体である。この吸収体を通過する時に一部の電界が乱れ、垂直波も発生するからビス40からなる針山を配し、再び水平波のみを通過させ、次の高周波吸収体も水平に固定し、効率良く吸収させるものである。フィルターと吸収体とを交互に多数配置する事により高周波漏洩が防止される。
【0028】
次に高周波吸収体の固定の作用について述べる。図4の部分拡大図に示す如くハッチングを施した高周波吸収体38は2枚の吸収体取り付け板横大35と同横底37とで形成される角筒内部にあり、2枚の吸収体取り付け板横小36により角筒底面に押しやられかつ同突起63により相互間距離が規制され、上下左右前後すべて位置規制され、保持される。平行に並ぶ2枚の吸収体取り付け板縦孔41のスリット43および三つのスリット44に挿入された吸収体大38と同小45も吸収体取り付け板縦42によりスリットからの落下が防止されるので安定に保持される。つまり孔も切欠きもない単純な板状の吸収体大38と同小45とがガラスクロス積層板により安定して保持されたのである。
【0029】
一般に高周波吸収体はフェライトやカーボン等の硬質脆弱な材質で作られ、孔加工や切欠き加工の如き保持に必要な付帯加工が困難かつ高価であるだけでなく、孔や切欠きによって取り除かれた分だけ吸収性能低下に結びつくので、本発明ではそれらの付帯加工が不必要な方法を見いだしたのである。またこの様に全てガラスクロス積層板の組み合わせによる保持であり、金属ビス固定の様な強い締め付けではないので輸送時の振動や落下で欠けると言った問題が解消する。 従ってトンネル全体として、吸収体は平板のまま、その保持はガラスクロス積層板の組み合わせ、針山はビスナット等、安価な材料、簡単な構成であり、かつ水平偏波フィルターの2段目以降を横一列の針山としたので図2で5段構成を示した如く短い距離間に多段のフィルターを構成でき、高周波漏洩防止性能向上にも役立つ。高性能、高信頼性を有するトンネルが簡単かつ安価に実現できるのである。
【0030】
また図2および図4に示す如くトンネル側面の左右に通風用小孔群39が設けられ、両者を結ぶ角筒、一種のエアーガイドの中に高周波吸収体が収納された状態となり、空冷による熱交換が容易となる。また図4(D)に示す如く吸収体取り付け板横底37には高周波吸収体38に対応した大きな角孔が開けられており、高周波吸収体38は上下両面から空冷の風を受ける事ができる。
【0031】
なお針山の二つ目以降は横1列の針で十分であるが二つ目を横2列、三つ目以降を横1列としても若干トンネル長さが長くなるだけで大差はない。横1列の一部を千鳥配列としても本質的には同じであり、本発明の主旨を出るものではない。
【0032】
水平に置かれた高周波吸収体38または45の金属壁面からの距離ゼロでは効率良く吸収されない。設計的に決定すべき事項である。図2に示す如く左から第一、第三、第四段目は針の先端と同程度であるが第二、第五段目は約半分である。
【0033】
またフィルムの一端をバネで引っ張っているがこれは径時変化により弛む事を防止する目的である。多少の変化を容認するならば必須ではない。
【0034】
【発明の効果】
以上述べた構成により本発明は次の効果を有する。
【0035】
(1)薄いフィルムで一種の樋を構成し、この樋で長方形筒状トンネルの筒の両端および上半分の全てを被い、しかも樋の端は樋の下を走行するコンベアベルトの外側に位置するので、トンネル内部に侵入した清掃水等はベルトの外側に落下し、ベルト上の食品には落下しない。またフィルムが薄いのでトンネル高さを低下させない。
【0036】
(2)針山による水平偏波フィルターの次に水平に置かれた平板状高周波吸収体を配置し、かつ交互に複数段並べたので優れた漏洩防止装置が実現できる。また板状の高周波吸収体に孔開けや切欠きと言った加工を施さずに保持されるので高周波吸収性能の低下も無く、輸送中の振動落下等の衝撃にも強く、高性能、高信頼性を有するトンネルが安価に実現できる。さらに2段目以降の水平偏波フィルターが横1列の針山であるから短距離の間に多段のフィルターを挿入でき、高周波漏洩防止性能が向上する。
【0037】
(3)長方形筒状トンネルの相対する側面に通風用小孔群が開けられ、この両者を結ぶ一種のエアーガイド内部に高周波吸収体が収納されているので空冷による排熱、熱交換が容易にできる。
【図面の簡単な説明】
【図1】 本発明の一実施例のトンネル式高周波連続炉の側面図
【図2】 同トンネル式高周波連続炉の排出側トンネルの断面図
【図3】 (A)同トンネル式高周波連続炉の排出側トンネルの平面図
(B)同側面図
【図4】 (A)同トンネル式高周波連続炉のエアーガイドの平面図
(B)同エアーガイドの側面図
(C)同エアーガイドを構成する吸収体取り付け板横小の正面図
(D)同吸収体取り付け板横底の平面図
(E)同吸収体取り付け板横大の正面図
【図5】 (A)同吸収体取り付け板縦孔の正面図
(B)同吸収体取り付け板縦の正面図
【図6】 (A)本発明の一実施例のトンネル式高周波連続炉のフィルムの取り付けられた状態を示す平面図
(B)同側面図
【符号の説明】
1 投入側トンネル
15 排出側トンネル
26 キャビティ
28 トンネル外壁上(長方形筒)
29 トンネル外壁下(長方形筒)
33、40、46、47、48 ビス(水平偏波フィルター)
35 吸収体取り付け板横大(誘電体板)
36 吸収体取り付け板横小(誘電体板)
37 吸収体取り付け板横底(誘電体板)
41 吸収体取り付け板縦孔(誘電体板)
42 吸収体取り付け板縦 (誘電体板)
38 高周波吸収体大(水平高周波吸収体)
45 高周波吸収体小(水平高周波吸収体)
50 フィルム
60 コンベアベルト
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a tunnel type high frequency continuous furnace for thawing a large amount of frozen food.
[0002]
[Prior art]
In factories that handle food, strict hygiene management is required, and the tunnel-type high-frequency continuous furnace is required to be easy to clean as the minimum requirement for hygiene management. In addition, water used for cleaning and water generated by internal condensation are used as food. It is required to have a structure that does not fall down. At the same time, the tunnel part, which is a key technology of the tunnel furnace, is naturally required to be able to pass large foods and have a large tunnel height of 1 mm. The requirement for water not to fall on top often squeezes the latter tunnel height.
[0003]
Since a high-frequency absorber or the like is generally housed inside the tunnel, the top surface is covered with a dielectric plate. On the other hand, since the wall surface of the cavity irradiated with the high frequency is made of metal, it is impossible to integrate the two, and therefore both must be joined by some method. The joint between this metal wall and the top dielectric plate crosses over the belt, so water that has entered the tunnel or water generated inside the condensation falls from this joint onto the food placed on the belt. There is no doubt. In order to prevent this, a ridge must be provided under the joint, and the tunnel height is reduced accordingly.
[0004]
Various patents have also been filed for technologies related to tunnel height expansion, but the method of introducing high-frequency absorbing liquid such as mainstream water into the tunnel is inevitable to increase in scale, and water and sewage costs, equipment construction, scale removal, and scale removal Maintenance is required.
[0005]
As a method that does not use water, USP 4,182,946 discloses a needle mountain system, USP 4,488,027 has a two-stage configuration of choke and ferrite, and Japanese Utility Model Publication No. 54-178149 discloses a conveyor. A technology has been filed, such as arranging a reactance element type filter and a high-frequency absorber alternately at the doorway. However, they do not mention the above-mentioned countermeasures against dropping of water, and lack the viewpoint of heat exchange that was easy with the method using running water. These unresolved and breakthrough technical issues exist and cannot be put to practical use as they are, and there is almost no disclosure of mechanism explanations, specific effects, etc. as well as principle explanations for high-frequency leakage prevention, which is intended to solve design problems. Coupled with being an area where various restrictions are imposed at least, it was impossible.
[0006]
[Problems to be solved by the invention]
The problems of the above prior art can be summarized as follows.
[0007]
(1) There is no countermeasure for dropping water onto the conveyor. Or if measures are taken, the tunnel height will be lowered accordingly.
[0008]
(2) There is a need for a tunnel that does not require construction such as water and sewage facilities, has a low running cost, can be configured simply and inexpensively.
[0009]
(3) A means for exchanging heat of the high-frequency absorber without using water is required.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problem (1), the present invention has a cavity, a conveyor belt, and a tunnel type high frequency leakage prevention device provided at a conveyor belt through-hole of the cavity. The top surface has a bottom surface parallel to the top surface and a hook shape extending upward at the tunnel entrance, and is held by a film-like dielectric provided with a hook end outside the effective placement area of the conveyor belt. Since the terminal end is located outside the effective placement area of the conveyor belt, the water that has entered the tunnel or the water generated by condensation or the like does not fall on the food on the belt.
[0011]
In order to solve the above problem (2), the present invention has a cavity, a conveyor belt, and a tunnel type high frequency leakage prevention device provided at the conveyor belt through-hole of the cavity. The polarization filter and horizontal high-frequency absorber are arranged alternately several times in the direction of the conveyor. Only horizontal waves pass through the tunnel by the horizontal polarization filter and are absorbed by the horizontal high-frequency absorber. The vertical wave generated when passing through the horizontal high-frequency absorber passes only the horizontal wave again with the next horizontal polarization filter, and is efficiently absorbed again with the subsequent horizontal high-frequency absorber. Therefore, a simple and inexpensive tunnel that does not use water can be realized.
[0012]
Furthermore, in order to solve the above-mentioned problem (3), the present invention has a cavity, a conveyor belt, and a tunnel type high frequency leakage prevention device provided at the conveyor belt through-hole of the cavity. A rectangular parallelepiped made of metal and a plurality of high-frequency absorbers provided therein, the high-frequency absorber being held by a plurality of dielectric plates fitted in slits opened in the wall surface of the metal rectangular parallelepiped, at least a cavity The dielectric plates holding the high-frequency absorber closest to the wall are a plurality of parallel plates provided at right angles to the running direction of the belt, and the left and right side walls of the metal rectangular parallelepiped facing the region composed of the plurality of plates Is a structure provided with a group of small holes for ventilation, and if a wind is introduced from one of the small holes group for ventilation with a fan motor or the like, a plurality of parallel dielectric plates become air guides, Is discharged from the other ventilation for the small hole group after cooling the frequency absorber to the outside, it is heat or heat exchange of the high frequency absorber.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
The present invention has a cavity, a conveyor belt, and a tunnel type high frequency leakage prevention device provided at a conveyor belt through-hole of the cavity, and the tunnel inner top surface of the tunnel type high frequency leakage prevention device is parallel to the top surface. It has a bottom shape and a hook shape that extends upward at the tunnel entrance and is held by a film-like dielectric with a hook end outside the effective loading area of the conveyor belt. One end is fixed inside the cavity with screws The other end is fixed in a tensioned state via a spring, the central part is the lower end of the top surface of the tunnel, and the end of the ridge is located outside the conveyor belt placement area. This has the effect that the water generated by such means does not fall on the food on the belt.
[0014]
The tunnel type high frequency leakage prevention apparatus of the present invention has a configuration in which a horizontal polarization filter and a horizontal high frequency absorber are alternately arranged a plurality of times with respect to the conveyor traveling direction, and has a length of about 1/4 wavelength as a horizontal polarization filter. By using a metal screw group, only horizontal waves pass through the tunnel, and a horizontal ferrite plate is used as a horizontal high-frequency absorber, so that horizontal waves are absorbed and alternately provided. Therefore, the vertical wave generated when passing through the horizontal high-frequency absorber becomes only the horizontal wave again by the next horizontal polarization filter, and is efficiently absorbed again by the subsequent horizontal high-frequency absorber. Therefore, there is an effect that a simple and inexpensive tunnel without using water can be realized.
[0015]
Furthermore, the horizontal polarization filter of the present invention is composed of a needle group, has a length of 1/4 wavelength or more with respect to the horizontal polarization filter conveyor traveling direction closest to the cavity, and the second and subsequent horizontal polarization filters. The filter is composed of a horizontal row of needles, using a metal screw having a wavelength of about ¼ wavelength as a needle, and using a ferrite plate placed horizontally as a horizontal high-frequency absorber. Since the second and subsequent filters are one horizontal row of needles, they can be provided in a short range and can be made small and inexpensive.
[0016]
Furthermore, the tunnel type high frequency leakage prevention apparatus of the present invention comprises a metal rectangular tube and a plurality of high frequency absorbers provided therein, and the high frequency absorber is fitted into a slit formed in the wall surface of the metal rectangular tube. A structure that is held by a plurality of combined dielectric plates, uses a glass cloth laminated plate as a dielectric, and has a key fitting portion slightly smaller than the slit size of the metal wall surface and a hole slightly larger than the cross-sectional shape of the high-frequency absorber. And holds the high-frequency absorber, and has an effect that it can be configured easily and inexpensively.
[0017]
The tunnel-type high-frequency leakage prevention device of the present invention has a metal rectangular parallelepiped and a plurality of high-frequency absorbers provided therein, and the high-frequency absorber is fitted into a slit opened in the wall surface of the metal rectangular parallelepiped. The dielectric plates that are held by the plurality of dielectric plates and hold at least the high frequency absorber closest to the cavity are a plurality of parallel plates provided at right angles to the belt running direction. The right and left side walls of the metal cuboid facing the area to be blown are provided with a group of ventilation holes. If wind is introduced from one of the ventilation holes by a fan motor or the like, a plurality of parallel dielectrics are formed. The body plate serves as an air guide, and after cooling the high-frequency absorber, the body plate is discharged to the outside from the other small hole group for ventilation, so that the high-frequency absorber can be exhausted or heat exchanged.
[0018]
【Example】
An embodiment will be described below with reference to the drawings.
[0019]
FIG. 1 is a side view of a tunnel type high frequency continuous furnace of the present invention. The left is the food input side and the right is the heated food discharge side. An operation unit 2 is provided above the input-side tunnel 1, and a belt mechanism 3 and a cleaning removal window 4 are provided below. There are three top covers 5, 6 and 7 in the center, two side covers 8 and 9 in the middle, and five machine rooms 10, 11, 12, 13 and 14 in the lower part. 1 includes a discharge-side tunnel 15 and a belt driving mechanism 16 and a cleaning removal window 17 therebelow. There are casters 18 and 19 and adjuster bolts 20 and 21 on the bottom portion, and juice trays 22, 23, 24 and 25 are on the left and right of these.
[0020]
FIG. 2 is a cross-sectional view of the discharge side tunnel 15. A laterally long opening 27 is formed in the side wall 26 of the cavity, and the left end of the rectangular cylinder formed by the upper tunnel outer wall 28 and the lower tunnel outer wall 29 is formed on the outer side of the surrounding cavity. It is fixed to the side wall 26 with screws 30 and 31, and the right end is covered with a terminal cover 32. On the upper and lower planes of the rectangular cylinder, five rows from the left end are fixed with metal screws 33 with nuts 34 so that the tip faces the inside of the tunnel. Next, 352 large absorber mounting plates made of glass cloth laminated plates are inserted, fitted and fixed in slits 36 a (shown in FIG. 3) opened on the tunnel outer wall 28 and below 29, A kind of square tube is formed by the combination with the absorber mounting plate lateral bottom 37, and a large high-frequency absorber 38 is held in the square tube. The two small absorber mounting plates 36 have a role of regulating the position between the large high frequency absorbers 38 and the top and bottom. A small hole group 39 for ventilation is formed in the side surface of the tunnel outer wall 28 so as to coincide with the positions of the two large absorber mounting plates 35. That is, both ends of the square tube holding the large absorber 38 are coupled to the ventilation hole group, and the square tube has a function of an air guide.
[0021]
Next, a row of screws 40 are also fastened with nuts on the upper surface of the tunnel outer wall 28, and next to the absorber mounting plate vertical holes 41 with four slits made of a glass cloth laminate and no slits. The absorber mounting plate length 42 is fixed at a ratio of 2 with holes to 1 with no holes. The large slit 43 formed in the mounting plate vertical hole 41 has a high frequency absorber 38 and the small slit 44 has high frequency absorption. The small body 45 is inserted, and the drop from the slits 43 and 44 is prevented by the mounting plate length 42 without a slit. Further, a row of screws 46, 47, and 48 are each nut-fastened between the four high-frequency absorbers 38 and 45 on the upper surface on the outer wall of the tunnel.
[0022]
2 is basically symmetrical in the vertical direction, the only difference being that the upper surface has a film 50 pulled by a spring 49, and the left end of the film 50 is sandwiched between the metal fitting 51 and the cavity side wall 26, Fastened with screws 30. A U-shaped side support bracket 52 having a U-shaped cross section is fixed to the center of the side surface on the outer wall of the tunnel, and upper and lower flanges hold the left and right ends of the tunnel cover 53 made of glass cloth laminate.
[0023]
FIG. 3A is a plan view of the discharge-side tunnel 15 as viewed from above, and FIG. 3B is a side view of the discharge-side tunnel 15 as viewed from the discharge side, with the end cover 32 being removed. In the plan view of (A), the spring 49 is hooked between small holes opened in both the metal fitting 54 fixed by the screw 46 and the metal fitting 55 having a similar shape, and the end of the film 50 is the metal fitting 55. And a metal fitting having the same shape as the metal fitting 51 described above. Above the slit 36 a is arranged in two rows in the upper slit 56 is also arranged in two rows on its inner side. Slits 36 a and 56 (shown in FIG. 5) hooked portion 57 of the absorbent body mounting plate lateral size 35 and the absorber mounting plate lateral small 36 and fitted. The slits 58 and 59 opened vertically in the central portion are fitted to the key-shaped portions of the absorber mounting plate vertical hole 41 and the absorber mounting plate vertical 42, respectively. A two-dot chain line on the left and right in the drawing and extending vertically is the end of the conveyor belt 60, and both are located outside the left and right ends of the film 50. In the side view of (B), one small high-frequency absorber 45 is held in the two absorber mounting plate vertical holes 41, and the absorber mounting plate vertical 42 is responsible for the left and right position regulation. The tunnel cover 53 is placed on the body attachment plates 41 and 42, and the left and right ends are shown to be pressed by the flanges of the U-shaped side surface support fitting 52. As described above, the inside of the tunnel is vertically symmetrical except for the film 50, so that the tunnel cover 53 is held on the film 50.
[0024]
FIG. 4 is a diagram showing the relationship between the absorber mounting plate horizontal 35, the absorber mounting plate horizontal 36, the absorber mounting plate horizontal bottom 37, and the high frequency absorber 38. (A) is combined as a square tube or an air guide. (B) is the same side view, (C) is a front view of the absorber mounting plate horizontal small 36, (D) is a plan view of the absorber mounting plate horizontal bottom 37, (E ) Is a front view of the absorber mounting plate horizontal size 35. FIG. The key portion 62 of the absorber mounting plate lateral bottom 37 is inserted into the slit 61 at the lower portion of the absorber mounting plate horizontal size 35 to form a substantially U shape, and after inserting the key portion 57 into the slit 36, the direction of the arrow shown in the figure It is moved, fitting the key 57 and the slit 36 a. The key portion 62 has the same shape as the key portion 57, but the key direction is opposite. The protrusions 63 of the absorber mounting plate lateral small 36 are positioned at the left and right ends of the high frequency absorber large 38.
[0025]
5A is a front view of the absorber mounting plate vertical hole 41, and FIG. 5B is a front view of the absorber mounting plate vertical 42. FIG. Both are provided with a key portion 57. The height H excluding the key portion is the same, and the absorber mounting plate horizontal size 35 in FIG. 4E is also the same height. FIG. 6A is a plan view of a state where the film 50 is attached and a two-dot chain line is a plan view of the film before being attached, and the holes arranged in a line at both ends are for attaching the metal fittings 51 and 55. (B) is the same side view, and the tunnel cover 53 is drawn by a two-dot chain line. It will be understood from the figure that the film 50 has a bowl shape.
[0026]
Next, the operation will be described. As shown in FIG. 6, the film 50 is a kind of eaves, which covers both the end faces and the inner top face of the aforementioned rectangular cylinder, and the end faces of the eaves are located outside the conveyor belt. Also, water generated inside due to condensation falls from the edge of the bottle and does not fall on the belt. In this example, a polyester film having a thickness of about 180 microns was used as the thin film dielectric.
[0027]
As is clear from FIGS. 2 and 3B, the tunnel that is a rectangular cylinder is a kind of rectangular waveguide, and therefore, the main mode is considered to have an electric field in the vertical direction. However, as shown in FIG. 2, the screws 33, 40, etc. constituting the needle thread are oriented in the vertical direction. From the basic knowledge of electromagnetism, the electric field is perpendicular to the metal, so the electric field inside the square tube becomes horizontal due to the presence of needles. In other words, Needleyama functions as a horizontal polarization filter. A large high-frequency absorber 38, which is a flat plate, is fixed in the horizontal direction and close to the tip of the needle ridge, adjacent to the needle hill made of screws 33. This is also because of the fundamental knowledge of electromagnetics, if the electric field and the absorber are at right angles to each other, they are not so much absorbed, but if they are parallel, they are well absorbed, so the high frequency absorber placed horizontally adjacent to the horizontal polarization filter is a filter. Absorbs horizontal waves after passing well. In other words, it is a horizontal polarization absorber. When passing through this absorber, part of the electric field is disturbed and vertical waves are also generated, so a needle ridge made of screws 40 is arranged, only horizontal waves are passed again, and the next high-frequency absorber is also fixed horizontally, efficiently. Absorb. High frequency leakage is prevented by arranging a large number of filters and absorbers alternately.
[0028]
Next, the operation of fixing the high frequency absorber will be described. As shown in the partially enlarged view of FIG. 4, the hatched high-frequency absorber 38 is inside a square tube formed by two horizontal absorber mounting plates 35 and a horizontal bottom 37, and two absorber mountings are provided. The plate is pushed to the bottom of the rectangular tube by the small plate 36 and the distance between the protrusions 63 is restricted by the projection 63, and the positions are restricted and held in all directions. Since the absorber large plate 38 and the same small size 45 inserted into the slit 43 and the three slits 44 of the two absorber mounting plate vertical holes 41 arranged in parallel are prevented from falling from the slit by the absorber mounting plate vertical 42. It is kept stable. That is, the simple plate-like absorber large 38 and the same small 45 having no holes and notches are stably held by the glass cloth laminated plate.
[0029]
In general, high-frequency absorbers are made of hard and brittle materials such as ferrite and carbon, and are not only difficult and expensive to carry out the necessary accessory processing such as drilling and notching, but also removed by holes and notches. Therefore, the present invention has found a method that does not require such additional processing. In addition, all the holdings by the combination of glass cloth laminates are not such a strong tightening as metal screw fixing, so the problem of chipping due to vibration or dropping during transportation is solved. Therefore, as a whole tunnel, the absorber remains flat, its holding is a combination of glass cloth laminates, needle needles are inexpensive materials such as screw nuts, simple configuration, and the horizontal polarization filter is placed in a row horizontally As shown in FIG. 2, a multi-stage filter can be formed within a short distance as shown in FIG. 2, which is useful for improving high-frequency leakage prevention performance. A tunnel having high performance and high reliability can be realized easily and inexpensively.
[0030]
As shown in FIGS. 2 and 4, small holes 39 for ventilation are provided on the left and right sides of the tunnel, and the high frequency absorber is housed in a rectangular tube connecting the both, a kind of air guide, and the heat generated by air cooling. Exchange becomes easy. Further, as shown in FIG. 4D, a large square hole corresponding to the high frequency absorber 38 is formed in the horizontal bottom 37 of the absorber mounting plate, and the high frequency absorber 38 can receive air-cooled wind from both the upper and lower surfaces. .
[0031]
It should be noted that for the second and subsequent needle hills, one horizontal row of needles is sufficient, but even if the second row is two horizontal rows and the third and subsequent rows are one horizontal row, the tunnel length is only slightly increased and there is no significant difference. Even if a part of one horizontal row is a staggered arrangement, it is essentially the same and does not depart from the gist of the present invention.
[0032]
When the distance from the metal wall surface of the high-frequency absorber 38 or 45 placed horizontally is zero, it is not efficiently absorbed. This should be determined by design. As shown in FIG. 2, the first, third and fourth stages from the left are the same as the tip of the needle, but the second and fifth stages are about half.
[0033]
One end of the film is pulled by a spring, which is intended to prevent the film from sagging due to changes over time. It is not essential if some changes are acceptable.
[0034]
【The invention's effect】
With the configuration described above, the present invention has the following effects.
[0035]
(1) A kind of ridge is made up of a thin film, and this ridge covers both ends and the upper half of the tube of the rectangular cylindrical tunnel, and the end of the ridge is positioned outside the conveyor belt running under the ridge. Therefore, cleaning water or the like that has entered the tunnel falls to the outside of the belt and does not fall on the food on the belt. Moreover, since the film is thin, the tunnel height is not lowered.
[0036]
(2) Since a flat plate-shaped high-frequency absorber placed horizontally next to the horizontal polarization filter by needle ridges is arranged and arranged in a plurality of stages alternately, an excellent leakage prevention device can be realized. In addition, the plate-like high-frequency absorber is held without drilling or notching, so there is no deterioration in high-frequency absorption performance, and it is resistant to shocks such as vibration drops during transportation, and has high performance and high reliability. Can be realized at low cost. Further, since the second and subsequent horizontal polarization filters are one horizontal row of needles, a multi-stage filter can be inserted over a short distance, and the high frequency leakage prevention performance is improved.
[0037]
(3) A small hole group for ventilation is opened on the opposite side of the rectangular tubular tunnel, and a high frequency absorber is housed inside a kind of air guide that connects the two, so that exhaust heat and heat exchange by air cooling are easy. it can.
[Brief description of the drawings]
FIG. 1 is a side view of a tunnel type high frequency continuous furnace according to an embodiment of the present invention. FIG. 2 is a sectional view of a discharge side tunnel of the tunnel type high frequency continuous furnace. Plan view of discharge tunnel (B) Side view [Figure 4] (A) Plan view of air guide of tunnel type high-frequency continuous furnace (B) Side view of the air guide (C) Absorption constituting the air guide Front view of the side of the body mounting plate (D) Top view of the bottom of the mounting body of the absorber (E) Front view of the side of the mounting board of the absorber [FIG. 5] (A) Front of the vertical hole of the mounting body of the absorber Fig. (B) Front view of the absorber mounting plate in the vertical direction [Fig. 6] (A) Plan view showing a state where the film of the tunnel type high frequency continuous furnace of one embodiment of the present invention is mounted (B) Side view of the same [ Explanation of symbols]
1 Incoming tunnel 15 Outlet tunnel 26 Cavity 28 On tunnel outer wall (rectangular tube)
29 Under tunnel outer wall (rectangular tube)
33, 40, 46, 47, 48 screws (horizontal polarization filter)
35 Absorber mounting plate horizontal size (dielectric plate)
36 Absorber mounting plate horizontal (dielectric plate)
37 Absorber mounting plate side bottom (dielectric plate)
41 Absorber mounting plate vertical hole (dielectric plate)
42 Absorber mounting plate length (dielectric plate)
38 Large high frequency absorber (horizontal high frequency absorber)
45 Small high frequency absorber (horizontal high frequency absorber)
50 film 60 conveyor belt

Claims (5)

キャビティと、コンベアベルトと、キャビティのコンベアベルト貫通口に設けられたトンネル式高周波漏洩防止装置とを有し、トンネル式高周波漏洩防止装置のトンネル内側天面は、この天面と平行な底面と、トンネル出入口で上に延びる樋形状を有し、コンベアベルトの有効載置域外に樋の終端を設けたフィルム状誘電体で保持された事を特徴とするトンネル式高周波連続炉。A cavity, a conveyor belt, and a tunnel-type high-frequency leakage prevention device provided at a conveyor belt through-hole of the cavity, and a tunnel inner high-frequency leakage prevention device has a tunnel inner top surface, a bottom surface parallel to the top surface, A tunnel type high frequency continuous furnace characterized in that it is held by a film-like dielectric having a hook shape extending upward at the tunnel entrance and having an end of the hook provided outside the effective placement area of the conveyor belt. トンネル式高周波漏洩防止装置は水平偏波フィルターと水平高周波吸収体とをコンベア走行方向に対し複数回交互に並べた事を特徴とする請求項1記載のトンネル式高周波連続炉。Tunnel frequency continuous furnace according to claim 1, wherein the tunnel-type high frequency leakage preventing device, characterized in that arranged in a plurality of times alternately with respect to the conveyor running direction and a horizontal polarization filter and horizontal high frequency absorber. 水平偏波フィルターは針山群で構成され、キャビティに最も近い位置の水平偏波フィルターコンベア走行方向に対し横に複数列の針とし、二つ目以降の水平偏波フィルターは横1列の針である事を特徴とする請求項2に記載のトンネル式高周波連続炉。The horizontal polarization filter is composed of a group of needles, with multiple rows of needles next to the horizontal polarization filter conveyor running direction closest to the cavity, and the second and subsequent horizontal polarization filters are one row of needles. The tunnel type high frequency continuous furnace according to claim 2, wherein the tunnel type high frequency continuous furnace is provided. トンネル式高周波漏洩防止装置は金属製の長方形筒およびその内部に設けられた複数個の高周波吸収体から成り、高周波吸収体は前記金属長方形筒の壁面に開けられたスリットに嵌合した複数の誘電体板に保持された事を特徴とする請求項2に記載のトンネル式高周波連続炉。The tunnel-type high-frequency leakage prevention device is composed of a metal rectangular tube and a plurality of high-frequency absorbers provided therein, and the high-frequency absorber is fitted with a plurality of dielectrics fitted in slits opened in the wall surface of the metal rectangular tube. 3. The tunnel type high frequency continuous furnace according to claim 2, wherein the tunnel type high frequency continuous furnace is held by a body plate. トンネル式高周波漏洩防止装置は金属製の直方体およびその内部に設けられた複数個の高周波吸収体とを有し、高周波吸収体は前記金属直方体の壁面に開けられたスリットに嵌合した複数の誘電体板に保持され、少なくともキャビティに最も近い位置の高周波吸収体を保持する誘電体板はベルトの走行方向に対し直角に設けられた平行な複数枚であり、この複数枚で構成される領域に面する金属直方体の左右側面壁には通風用小孔群を設けた事を特徴とする請求項1記載のトンネル式高周波連続炉。 Tunnel type high frequency leakage preventing device comprises a plurality of high-frequency absorbing member provided in a rectangular parallelepiped and inside thereof a metal, high-frequency absorber of the plurality fitted in a slit opened in the wall surface of the metal cuboid The dielectric plate that is held by the dielectric plate and holds at least the high-frequency absorber closest to the cavity is a plurality of parallel plates provided at right angles to the running direction of the belt. The tunnel type high frequency continuous furnace according to claim 1 , wherein a small hole group for ventilation is provided on the left and right side walls of the metal rectangular parallelepiped.
JP15907998A 1998-06-08 1998-06-08 Tunnel type high frequency continuous furnace Expired - Fee Related JP3937585B2 (en)

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