201200826 六、發明說明： 【發明所屬之技術領域】 本發明係關於可將被冷卻物、尤其是生鮮食品等之被冷 卻物在冷卻空間内一面以傳送帶搬送、一面連續進行冷卻 或冷凍處理之致冷裝置，尤其是關於使殼體小型化，無需 經過分解便能夠收納於貨櫃中之致冷裝置。 【先前技術】 先前之食品冷凍裝置係於冷凍室内設置有搬送被冷凍食 品之傳送帶，於冷凍室内之上部空間配設有複數臺冷凍機 單元，包含空氣冷卻器及送風機之冷氣循環裝置，並在冷 凍室内使冷氣向著傳送帶之搬送面對流循環。如此，可將 被冷凍食品一面以傳送帶搬送、一面連續進行冷凍處理， 從而可提高處理效率。又，對被冷滚食品喷吹冷氣之衝擊 喷流，從而提高冷氣效果。 本申請人已提案有上述之連續搬送式致冷裝置（專利文 獻1)。該裝置係從具有漏斗形剖面之狹縫喷嘴對被冷凍食 品喷吹冷氣之衝擊喷流，藉由附壁效應形成密接於被冷凍 食品之表面之冷氣之薄膜流，從而獲得高冷卻效果者。以 下，藉由圖14及圖15說明專利文獻丨所揭示之裝置之概 略0 在圖14中該致冷裝置丨〇〇於以隔熱壁1〇4構成之密封殼 體102之内部形成有冷卻空間s ^於密封殼體之隔壁 上，設置有可開閉之檢點用門1〇6、1〇8及11〇。於密封殼 體⑽内配設有搬送被冷;東食品w之傳送㈣2。傳送帶⑴ ]52098.doc 201200826 係以包含去路112a與回路112b之環狀帶構成。 於去路112a之上方設置有上部冷氣喷射部1丨4，而於去 路112a之下方設置有下部冷氣喷射部116。於密封殼體1〇2 之側壁内側設置有空氣冷卻器118，於空氣冷卻器118之上 方設置有送風機（多翼式風扇）12〇。空氣冷卻器118係由設 置於密封殼體102之外部之省略圖示之冷凍機單元供給冷 媒或鹽水，從而冷卻庫内空氣。經冷卻之庫内空氣c藉由 送風機120被送至上部冷氣噴射部1丨4及下部冷氣喷射部 116。 如圖15所示’於上部冷氣噴射部114中’於喷嘴單元ία 一體設置有於下方並列於被冷凍食品w之搬送方向a之複數 個具有漏斗形剖面的狹縫喷嘴124。各狹縫噴嘴124延設於 相對於被冷凍食品w之搬送方向a之直角方向，且以包含漏 斗形剖面之加速部12 6及構成相同之流路面積之整流部（助 流部）128構成。設置於整流部128之前端之喷射口形成有 朝向相對於搬送方向a之直角方向之狹縫狀開口。 被送送至上部冷氣喷射部114之冷氣〇以加速部126予以 加速，且以整流部128予以整流後，對載置於傳送帶112之 去路112a之帶面之被冷凍食品w垂直噴吹。由於對被冷凍 食品w喷吹之衝擊噴流r會藉由附壁效應形成密接於被冷凍 食aoW之表面之薄膜流| ’故可提局被冷康食品w之冷卻效 果。 下部冷氣噴射部116亦與上部冷氣喷射部114同樣地，於 喷嘴單元130中，一體設置有包含具有山形剖面之加速部 152098.doc 201200826 134與整流部136之複數個狹縫喷嘴132，朝向去路之 帶體之背面喷射衝擊喷流r。供被冷凍食品w之冷卻後之冷 氣會通過形成於狭縫喷嘴間之排氣空間e，向傳送帶之寬 度方向排放，其後到達空氣冷卻器118而形成循環流。 傳送帶112之帶體之構成有以下情形：具有^數個微 孔，使從上方及下方噴吹之冷氣1*之流通性良好而提高冷 卻效果者；及以包含不鏽鋼等之熱傳遞性良好之材料之密 封體構成，並以經冷氣r冷卻之帶體冷卻被冷凍食品w而提 高冷卻效果者。 [先前技術文獻] [專利文獻] [專利文獻1]國際公開WO 2006/046317號公報 【發明内容】 [發明所欲解決之問題] 搬送被冷卻物之傳送帶，從處理能力方面來看，必需具 有某種程度以上之寬度尺寸。如圖丨4所示，由於先前之致 冷裝置於傳送帶之橫向配置有空氣冷卻器118，故殼體之 寬度增大。 又，由於在空氣冷卻器之上方配置送風機12〇形成從上 向下之冷氣流，故為了該冷氣流之整流化，必須形成較大 之正壓空間。又，由於在傳送帶之上下配設有具備具有漏 斗形剖面之狹縫喷嘴之上部冷氣喷射部114及下部冷氣喷 射部116’故不得不採取較大之該等之設置空間。 又’由於傳送帶之回路配置於冷卻空間内，故不得不專 152098.doc -6 - 201200826 就回路所需而增加殼體之高度。先前之致冷裝置於左右伸 出有用於形成冷氣循環流之管路。根據該等之理由，例如 能夠以卡車等搬送之貨櫃之内部容積之尺寸為長40英呎 (12 m)x寬23 111><高25 m，但先前之致冷裝置無法收容於 如此大小之貨櫃。因此，由於需分解搬送、於現場再組 裝故會浪費時間，且再組裝後之性能亦不穩定。 又，由於下部冷氣喷射部具備構造複雜之狹縫喷嘴，故 洗淨性不良，維護性及清潔性存在一些問題。再者，由於 冷卻二間之上部採取高壓較外部氣體大之正壓空間，故會 子面向該正壓空間設置之檢點用門施加正壓。因此，若於 運轉中打開檢點用門將伴有危險，且有檢點用門之耐久性 降低之問題。 ,，為縮小傳送帶之設置空間，不得不縮小驅動傳送帶 之旋轉滾筒之直徑。因此，考慮包含鋼帶等之帶體之金屬 疲勞，以往採用稍厚（1 mm左右）之傳送帶之板厚但會導 致帶體之熱負載增大’難以冷卻且傳送帶之成本亦增高。 又’於傳送帶之回路設置有婉蜒防止裝置，但該婉挺防 止裝置有結冰後無法發揮原來之功能之情形。 本發明鑑於上述之先前技術之問題，其第1目的在於實 現使殼體小型化，能夠收容於_，且不用分解搬送及在 現％之再組裝之致冷裝置。χ，其第2目的在於縮減在冷 [解決問題之技術手段] :了較外部氣體高厂堅之正壓空間，消除檢點用門開閉 時之危險性，且提高檢點用門之耐久性。 I52098.doc 201200826 為解決上述之問題，本發明之致冷裝置具備： 形成以隔熱壁包圍之橫長之冷卻空間之殼體；配設於該 冷部空間之長度方向之被冷卻物搬送用傳送帶；及於該冷 卻空間巾形成冷氣循環流之包含^氣冷卻器及送風機之冷 氣循環裝置；且該致冷裝置係可對該被冷卻物進行冷卻或 冷凍之連續處理者，其中具備： 負壓室，上述殼體具有矩形之橫剖面，該負壓室設置於 該橫剖面之上部區域，且鄰接配置上述空氣冷卻器與送風 機而形成負壓空間； 正壓室，其設置於該負壓室之下方區域，且由上述送風 機供給冷氣形成正Μ空間，並設置有上述傳送帶及從上下 方向朝該傳送帶喷射冷氣之冷氣噴射部；及 常壓之維護空間，其設置於該負壓室及正壓室之側方區 域接收在正麼至中供被冷卻物之冷卻後之冷氣，形成將 所接收之冷氣回收至該負壓室之冷氣回流。 在本發明裝置中’於Μ室鄰接配置送風機與线冷卻 器，縮小負壓室之空間’且將殼體設為矩形剖面，於殼體 内空間之上部配置負壓室，並於其下方配置正壓室，藉此 可於該負壓室縮減殼體之寬度方向尺寸。又，由於在負壓 室及正塵室之側方配置常壓之維護空間，且於該維護空間 中形成從負壓室供給至正壓室之冷氣回流流路故冷氣循 環流之壓損降低，從而無需較大之正壓空間。 藉此，可設為能夠收容於貨榧之大小。&，由於可將該 維護空間利用作為設置於殼體内之機器類之檢點用，故使 152098.doc 201200826 殼體内之機器類之維護變得容易。 在本發明裝置中，亦可㈣負壓室對正壓室供給冷氣之 冷氣口設置在與上述維護空間遠離之側之殼體侧壁附近， • 在該冷氣口之下方’於上下方向形成有對上述下部冷氣 喷射部供給冷氣之送氣空間。 藉此，可不用擴大殼體之寬度尺寸，確保對正壓室内之 冷氣喷射部供給冷氣之冷氣流路。再者，由於在下部正壓 室内可形成流暢之冷氣循環流’可降低冷氣循環流之壓 損’故可降低送風機之動力。 在本發明裝置中，亦可於面向維護空間之殼體側壁設置 開閉門，使操作員可進入該維護空間。藉此，由於使殼體 内之檢點變得容易，且面向常壓之維護空間設置有開閉 門，故可消除開放開閉門時之危險。又，可提高開閉門之 耐久性。 在本發明裝置中亦可為，傳送帶係包含配設於正壓室内 且兩端部導設於上述冷卻空間之外部之去路，使兩端與該 去路連結且配設於冷卻空間之外側下方之回路的環狀帶， 且構成為於冷卻空間之外部設置旋轉滾筒，使傳送帶盤繞 於旋轉滾筒之外周面而支撐並搬送傳送帶。 如此，由於將回路配置於冷卻空間之外側下方，故可就 該》卩分縮減正壓室之設置空間。藉此’由於可縮減殼體之 鬲度尺寸，故使殼體進一步小型化，從而使對貨櫃之收容 更容易。又，由於將回路設置於冷卻空間外，故使蜿蜒防 止裝置不易結冰’從而可發揮原來之功能。 152098.doc 201200826 再者，由於於冷卻空間之外部設置有旋轉滾筒，故旋轉 滾筒之設置空間無限制，可將該旋轉滾筒大徑化。因此， 由於了緩和帶體之金屬疲勞，故可使帶體之板厚薄化，藉 此可降低帶體之熱負載’且可節省帶體之成本。 在本發明裝置中，若以無冷氣散逸孔之金屬帶構成傳送 帶之帶體，則配置於傳送帶之下方之下部冷氣喷射部只要 具有冷卻帶體之功能即可。因此，下部冷氣喷射部無需特 別使用具有冷氣到達距離長之漏斗形剖面之狹縫喷嘴。因 此，由於可縮小下部冷氣喷射部之設置空間，故可縮減殼 體之高度尺寸，從而使對貨櫃之收容變得容易。 [發明之效果] 根據本發明裝置，在具備：形成以隔熱壁包圍之橫長之 冷郃空間之殼體；配設於該冷卻空間之長度方向之被冷卻 物搬送用傳送帶；及於該冷卻空間中形成冷氣循環流之包 含空氣冷卻器及送風機之冷氣循環裝置；且可對該被冷卻 物進行冷卻或冷凍之連續處理之致冷裝置中，由於具備： 負壓至，殼體具有矩形之橫剖面，該負壓室設置於該橫剖 面之上部區域’且鄰接配置空氣冷卻器與送風機而形成負 壓二間，正壓室，其設置於該負壓室之下方區域且由上 述送風機供給冷氣形成正壓空間，並設置有上述傳送帶及 從上下方向朝該傳送帶噴射冷氣之冷氣噴射部；及常壓之 維護二間，其设置於該負壓室及正壓室之側方區域，接收 在正壓至中供被冷卻物之冷卻後之冷氣，形成將所接收之 、氣回收至該負壓室之冷氣回流故可減少殼體之寬度尺 152098.doc 201200826 寸及咼度尺寸從而可貫現不經分解即可收容於貨櫃中之 致冷裝置。 因此’將財褒置搬送至安裝場所時，可不用分解及再 .、组裝，從而可消除分解及再組裝所需之時間，且再組裝時 纟性能降低之虞。又，由於配置有f壓之維護㈣，故操 作員可自由地進入該維護空間，從而使殼體内之機器類之 維護變得容易。 由於使供冷卻後之冷氣經由維護空間回到負廢室， 可形成机暢之冷氣循環流，從而降低冷氣循環流之壓 損’且可減少送風機之動力。 【實施方式】 以下’使用圖示之實施形態，詳細地說明本發明。但該 實施形態所記載之構成零件之尺寸、材質、形狀、其相對 置等/、要無特別特定之記載，則非將本發明之範圍僅限 定於此。 土於圖1〜圖13 ’說明本發明裝置之一實施形態。首先， 圖4說明本實施形態之致冷裝置1〇之整體構 成。致冷裝置1〇係以殼體12構成’該殼體12形成由隔熱壁 &長之冷部空間。再者’在圖2中，殼體η之前方 側壁及上部壁破除去，以便能夠觀察到内部構造。又，在 圖3中’基於相同之目@ ’除去殼體以之左半部分之前方 側壁。 <殼體12除設置於入口壁⑴之傳送帶之人口開口 14，2 °又置於出口壁12d之傳送帶之出口開口 16以外，呈密封* 152098.doc 201200826 le。於前方壁12a上，在殼體12之長度方向配設有複數個 監視用之窗18。於後方壁12b設置有複數個開閉門2〇，以 便操作員能夠進入殼體〗2内。 殼體12之上部壁12e為密封壁，其上貫穿從省略圖示之 冷/東機單元對空氣冷卻器供給冷媒或鹽水之供給管22，及 排放冷媒或鹽水之排放管24。殼體12之底部壁12£係藉由 腳26隔以間隔而支撐於地面1?上。於殼體12之下部設置有 將被冷凍食品w搬送至殼體丨2内之搬送裝置3〇。搬送裝置 30包含環狀傳送帶32，與驅動該傳送帶32之旋轉滾筒34及 36 ° 傳送帶32係以熱傳遞性良好之薄不鏽鋼板構成，且具有 無冷氣之散逸孔之密封構造。傳送帶32在入口壁i2c之外 側係盤繞於從動滾筒34 ’而在出口壁12d之外側盤繞於驅 動滾靖36。傳送帶32之去路32a搬送面係配置於水平方 向’且從入口開口 14及出口開口 16貫通配置於殼體12内， 於箭頭a方向移動。回路32b係配置於底部壁12 f之下方之 空間。 如圖1所示’殼體12具有矩形之橫剖面。殼體12内由隔 板壁38及40分隔成負壓室42、正壓室44、及配置於該等之 側方之維護空間46。負壓室42係設置於殼體12内之上部區 域’且於隔板壁38之上面固定有空氣冷卻器48。空氣冷卻 器48係與經由上述給排管22及24而和殼體12分開配設之省 略圖式之冷凍機單元連接。 又’於隔板壁38中鄰接於空氣冷卻器48而形成有圓形之 152098.doc 201200826 通風路38a。於該通風路38a安裝有圓筒形之罩體50,於罩 體50内設置有軸流風扇52及驅動馬達54。如圖3及圖4所 示，空氣冷卻器48於殼體12之長度方向設置2個單元，而 軸流風扇52於殼體12之長度方向上每！單元設置有4台。 且，以空氣冷卻器48予以冷卻之庫内空氣係藉由軸流風扇 52從通風路38a送至正麼室44。因此，負壓室42為負壓氛 圍。 如圖5所示，正壓室44設置於負壓室42之下方區域，且 兩者由隔板壁38予以隔開。正廢室44中，傳送帶32之去路 32a配置於水平方向。去路32a係藉由設置於寬度方向之複 數個支撐桿56而配置在特定高度。於傳送帶32之去路32a 之兩側上方，在殼體12之長度方向上配設有支撐框架58及 60。於去路32a之上方’沿著去路32a於傳送帶32之搬送方 向a設置有上部冷氣噴射部62。 上部冷氣喷射部62包含複數個噴嘴單元64，且嘴嘴單元 64之下部一體形成有4個與圖15所示之狹縫喷嘴124相同構 造之狹縫喷嘴64a，且噴嘴單元64之上部形成有凸緣64b。 該凸緣64b載置並支撐於支撐框架58、6〇上。狹縫喷嘴64a 之下端形成有配置於去路32a之寬度方向之狹縫狀冷氣噴 射口。 於去路32a之下方’沿著去路32a設置有下部冷氣喷射部 66。下部冷氣喷射部66係以一側具有冷氣流入口 68&之箱 狀罩體68構成。箱狀罩體68固定於底部壁i2f之上面，箱 狀罩體68之上面68b形成為平坦面，且穿設有複數個圓形 152098.doc 201200826 之冷氣喷出口 70。上面68b及底部壁12f相互大致平行地朝 向維護空間46側向下方傾斜。 其次’藉由圖6及圖7，說明搬送裝置30之入口壁12c侧 之構成。框架72連接於殼體12之入口壁12c，且藉由腳26 予以支撐於水平方向。圓筒形之從動滾筒34配置於水平方 向，且於從動滾筒34上盤繞有傳送帶32。於從動滾筒34之 表面被覆有橡膠材。從動滾筒34之旋轉轴34a之兩端藉由 軸承74可旋轉地予以支撐。 轴承74於箭頭a或b方向可滑動地受支撐於框架72，且經 由螺旋彈簧76安裝於框架72。藉此從動滚筒34可於箭頭a 或b方向移動’從而能夠調整傳送帶32之張力。於框架72 間架设有補強桿79、支撐傳送帶32之回路32b之支樓桿80 及引導回路32b之引導桿82。 其次’藉由圖8及圖9’說明搬送裝置3〇之出口壁i2d側 之構成。在圖8及圖9中，於出口壁i2d固定框架84 ,於框 架84上經由軸承86可旋轉地支撐驅動滾筒36之旋轉軸 36a »又’於框架84上安裝有驅動旋轉軸36a之驅動馬達 88。於驅動滾筒36上盤繞傳送帶32，藉由驅動滾筒36之旋 轉使傳送帶32於箭頭a或b方向移動❺與從動滾筒34同樣 地，於驅動滾筒36之外周面被覆有橡膠膜。 又於構成傳送帶3 2之不鏽鋼板之一側緣之背面，硫化 接合有具錐形之梯形剖面之橡膠突起33。另一方面，於從 動滾筒34之一側端面，接合有外周面上具有凹部77a之滑 輪77»以該凹部77a與從動滾筒34之端面形成有與橡膠突 152098.doc 201200826 起33欲合之凹、;卜在傳送帶32行進中，橡職㈣會喪合 於該凹槽，且在該凹漕内滑動。 用於形成凹部77a之滑輪77亦安裝於驅動滾筒36之一側 縞面以橡膠犬起33及滑輪77構成婉蜒防止裝置78。藉由 一面使橡膠突起33遊嵌於凹部77a並使傳送帶32行進，藉 此防止傳送帶32之婉誕。 在上述之構成中，於搬送裝置30之入口壁12c側，操作 員將被冷凍食品w載置於傳送帶32之去路32a之帶面。載置 於該帶面之被冷凍食品w從入口開口 14被搬送至殼體12内 之正壓室44。 另方面，在殼體丨2内空氣冷卻器48及軸流風扇52運轉 中，以空氣冷卻器48予以冷卻之冷氣c藉由轴流風扇52, 通過通風路38a被送至正壓室44。 在正壓至44内，從去路32a之上下兩側朝被冷凍食品…喷 射冷氣c。上部冷氣喷射部62係從狭縫喷嘴64a之狹縫狀喷 射口’對被冷凍食品w喷射直角狹縫狀之衝擊喷流r。如上 所述，狭縫喷嘴64a包含具有使冷氣c加速之錐形之剖面之 加速部’與將經加速之冷氣c進行整流之整流部（助流部）， 且可喷射到達距離長之喷流。由於從狹縫喷嘴64a喷出之 衝擊喷流Γ可藉由附壁效應形成密接於被冷凍食品w之表面 之冷氣流，故可提高冷卻效果。 下部冷氣嘴射部66係從設置於罩體68之上面68b之冷氣 喷射口 70向去路32a之下面喷射冷氣c。冷氣c之到達距離 為冷耽唢射口 70之孔徑之6倍。由於冷氣喷射口 7〇為大 152098.doc •15· 201200826 徑，故冷氣C之到達距離變長，即使上面68b傾斜，亦可使 冷氣c遍及去路32a之寬度方向全域而到達至去路32a之下 面。 又’由於可採取寬廣之形成於狹縫喷嘴2〇間之排氣空間 e，因此由於可從食品搬送物w順利地排放供冷卻後之冷 氣’故該排冷氣不會擾亂衝擊喷流Γ。 再者，於圖16，作為比較例，顯示以具有矩形喷嘴部 152且於前端平坦喷射面154設有穿孔之上部冷氣喷射部 150構成之上部冷氣喷射部。 在該構成中，若未相當大地採取矩形喷嘴部152之高度h 及矩形喷嘴部152之間之間距p，則無法充分確保排氣空間 e ° 因此，排冷氣會殘留於衝擊喷流Γ之周邊，擾亂衝擊喷 流r，而有損害冷卻效果之虞。相反地，若相當大地採取 間距P，則衝擊喷流r未喷吹至食品搬送物w之區域增加， 故而降低冷卻效果。因此，在該比較例中可知不太能獲得 冷卻效果β 下部冷氣喷射部66係從設置於箱狀罩體68之上面6扑之 冷氣噴射口 70向去路32a之下面喷射冷氣〇。由於冷氣喷射 口 為大徑，故到達距離變長，即使上面68b傾斜，使得 從冷氣喷射口 70至帶下面之距離增大，冷氣c亦可到達去 路32a之下面。因此，不會有對金屬帶32之冷卻效果降低 之情況》 根據本實施形態，由於將殼體12設為矩形之橫剖面，於 152098.doc •16· 201200826 设體内空間之上部配置負壓室42，並於其下方配置正壓室 44，且於該負壓室鄰接配置有轴流風扇52與空氣冷卻器 48 ’故可縮減殼體之寬度方向尺寸。 又’由於在通風路3 8a之下方，於上下方向形成有將冷 氣c導入箱狀罩體66内之冷氣通路，故無需於前方壁12a設 置用於冷氣流路之凸出部。 又，由於包含具備冷卻效果大之狹縫喷嘴64a之上部冷 氣喷射部62，與包含可縮減設置空間之箱狀罩體68之下部 冷氣喷射部66，故可一面高度維持被冷凍食品评之冷卻效 果’ 一面縮減冷氣喷射部之設置空間。 再者，由於將從動滾筒34、驅動滾筒36及金屬帶32之回 路32b設置於殼體12外，故可就該等部分降低傳送帶32之 〇又置问度。因此，如圖1〇所示，無需分解即可收容於上述 尺寸之貨櫃90。 因此，搬送至安裝現場之際，可節省致冷裝置10之分解 及再組裝所需之工夫，且可避免再組裝導致之性能降低。 又由於將從動滾筒34及驅動滾筒36配置於殼體12外， 故可使該等滾筒大徑化H可設定包含不鏽鋼板之傳 送帶32不會發生金屬疲勞引起之破壞之滾筒徑（帶厚之 1000倍左右）。藉此，由於可減輕對傳送帶32施加之彎曲 負載’故可緩和傳送帶32之金屬疲勞。因此，可使傳送帶 薄壁化從而可降低帶成本。例如，在本實施形態中， 可將構成傳送帶32之不鏽鋼板之厚度設為0.6 mm。 又由於相狀罩體68之上面68b及殼體12之底部壁32f向 152098.doc -17- 201200826 後方壁32b側傾斜，故洗淨時，洗淨水不會積存於上面6扑 及底壁部12f。又，由於箱狀罩體28之傾斜下降側側壁係 以可於上下滑動之門28c構成，故洗淨時，操作員使門28c 向上方滑動’即可容易從箱狀罩體28中排放洗淨水。藉此 提高密封空間之清潔性。 又，由於穿設於箱狀罩體68之上面68b之冷氣喷射口 70 之直徑大於25 ππηφ，故冷氣c之到達距離大。因此，即使 冷氣喷射口 70與帶下面之間隔變大，亦可高度維持傳送帶 3 2之冷卻效果。 圖11係就從冷氣喷射口 70至帶下面之高度，與對金屬帶 之熱傳遞率之關係，顯示以本實施形態之裝置進行實驗之 結果的線圖。在本實施形態中，箱狀罩體68之上面^扑傾 斜’且從冷氣喷射口 70至帶下面之間隔係在75〜95 範圍内變化。如圖所示可知，即使冷氣喷射口 7〇與帶下面 之間隔改變’對帶體之熱傳遞率亦不會有太大變化。因 此’如本實施形態所示’可知即使使上面68b傾斜，傳送 帶32之冷卻效果亦幾乎不會降低。 圖1 2A顯示本實施形態之箱狀罩體68。由於該箱狀罩體 68之上面68b向傳送帶32之寬度方向傾斜，故從冷氣喷射 口 70至傳送帶32之間隔％在75〜95 nm之間變化。圓形之冷 氣喷射口 70之直徑為25 mm<|)，且各冷氣喷射口 70係以相 互成正二角形的方式配置。各冷氣喷射口 7〇間之間距Pi為 100 mm。 另一方面’圖12B係作為比較例顯示之構成。於箱狀罩 152098.doc 201200826 體68,上設置複數個排氣空間e，箱狀罩體“，之平坦喷射面 68b，與傳送帶32之間隔仏為“ mm，傳送帶^之寬度方向 固定。於平坦喷射面68b，上設置有直徑為12 5 mm(|)之圓形 冷氣喷射口 70’各冷氣喷射口 7〇ι係以相互成正三角形的 方式配置，且各冷氣噴射口 7〇,間之間距p2g5〇 mm。再 者’平坦喷射面68b與平坦喷射面68,之開口率設定為相 同。 使用具備上述2種箱狀罩體之冷氣噴射機構，使用筠篛 作為食品搬送物w ’並將筠篛之冷卻效果之實驗結果顯示 於圖13。圖中，曲線X為使用箱狀罩體68之情形，而曲線 Y為使用箱狀罩體68’之情形。又，曲線z為冷卻空間之溫 度推移’曲線W為外部氣體溫度之推移。再者，筠篛之溫 度係以刺入筠篛之中央部之溫度感測器測量。 從圖13可知，使用2種箱狀罩體之情形中，筠篛之冷卻 效果幾乎不會變化。又，即使是將碎篛包裝後進行之實 驗’亦可獲得同樣之結果。因此可知，使用未形成排氣空 間e之本實施形態之箱狀本體6 8構造簡單，加工容易，且 可節省加工成本。 .又’根據本實施形態’由於具備操作員可從開閉門20進 入之維護空間46，故使得殼體12内之維護變得容易。再 者，由於在常壓之維護空間46設置有開閉門2〇，故即使在 裝置運轉中開啟開閉門20亦無危險。 再者，由於設置有轴流風扇52以形成冷氣循環流，故相 較於多翼式風扇等，可減少設置數，且可節省耗電量大約 152098.doc -19- 201200826 30 %。 [產業上之可利用性] 根據本發明，可實現使致冷裝置之殼體小型化，不用分 解而可收容於貨櫃，從而可大幅減少搬送所需之工夫之致 冷裝置。 【圖式簡單說明】 圖1係本發明之致冷裝置之一實施形態之橫剖面圖。 圖2係上述實施形態之致冷裝置之立體圖。 圖3係上述致冷裝置之平視圖。 圖4係沿著圖3中之A-A線之俯視剖面圖。 圖5係上述致冷裝置之冷氣喷射機構之立體圖。 圖6係顯示上述致冷裝置之金屬帶驅動裝置之驅動部之 平視圖。 圖7係圖6之驅動部之側視圖。 圖8係顯示上述金屬帶驅動裝置之從動部之平視圖。 圖9係上述從動部之側視圖。 圖10係將上述致冷裝置收容於貨櫃時之立體圖。 圖11係顯示上述致冷裝置之下部冷氣喷射部之至帶下面 之高度’與金屬帶之熱傳遞率之關係之線圖。 圖12A係顯示上述實施形態之箱狀罩體之構造之立體 圖。 圖12B係顯示作為比較例之箱狀罩體之構造之立體圖。 圖13係先顯示上述實施形態及比較例之食品搬送物之冷 卻效果之線圖。 152098.doc •20· 201200826 圖14係先前之致冷裝置之橫剖面圖。 圖15係先前之致冷裝置之冷氣喷射機構之說明圖。 圖16係作為比較例之冷氣喷射機構之說明圖。 【主要元件符號說明】 10 致冷裝置 12 殼體 12a 前方壁 12b 後方壁 12c 入口壁 12d 出口壁 12e 上部壁 12f 底部壁 14 入口開口 16 出口開口 18 監視用之窗 20 開閉門 22 供給管 24 排放管 26 腳 30 搬送裝置 32 環狀傳送帶 32a 去路 32b 回路 33 橡膠突起 152098.doc -21 - 201200826 152098.doc 34、 36 旋轉滾筒 34a 旋轉軸 38 ' 40 隔板壁 38a 通風路 42 負壓室 44 正壓室 46 維護空間 48 空氣冷卻器 50 罩體 52 軸流風扇 54 驅動馬達 56 支撐桿 58 ' 60 支撐框架 62 上部冷氣喷射部 64 喷嘴單元 64a 狹縫喷嘴 64b 凸緣 66 下部冷氣喷射部 68 ' 68， 箱狀罩體 68a 冷氣流入口 68b 上面 70 冷氣喷射口 72 框架 74 軸承 Joe -22 - 201200826 76 77 77a 78 79 80 82 84 86 88 90 100 102 104 106 、 108 、 110 112 112a 112b 114 116 118 120 • 122、130 124 ' 132 螺旋彈簧 滑輪 凹部 婉蜒防止裝置 補強桿 支撐桿 引導桿 框架 軸承 驅動馬達 貨櫃 致冷裝置 密封殼體 隔熱壁 檢點用門 傳送帶 去路 回路 冷氣喷射部 下部冷氣喷射部 空氣冷卻器 送風機 喷嘴單元 狹縫喷嘴 •23· 152098.doc 201200826 126 、 134 加速部 128 ' 136 整流部 150 上部冷氣喷射部 152 矩形喷嘴部 154 平坦喷射面 a 搬送方向 e 排氣空間 h 高度 P 間距 r 衝擊喷流 t 薄膜流 w 被冷凍食品 152098.doc ·24·201200826 6. DISCLOSURE OF THE INVENTION [Technical Field] The present invention relates to a method in which a material to be cooled, particularly a fresh food, or the like, can be conveyed by a conveyor belt in a cooling space while being continuously cooled or frozen. The cooling device, in particular, relates to a refrigeration device that can reduce the size of the casing and can be stored in the container without being decomposed. [Prior Art] In the prior art food freezing apparatus, a conveyor belt for conveying frozen food is provided in the freezing compartment, and a plurality of refrigerator units are disposed in the upper space of the freezing compartment, and a cold air circulation device including an air cooler and a blower is provided. In the freezer compartment, the cold air is transported toward the conveyor belt to face the circulation. In this way, the frozen food can be continuously conveyed while being conveyed by a conveyor belt, and the processing efficiency can be improved. In addition, the jet of cold air is blown by the cold-rolled food to improve the cooling effect. The applicant has proposed the above-described continuous transfer type refrigerating apparatus (Patent Document 1). In the device, a jet flow of cold air is blown from a slit nozzle having a funnel-shaped cross section, and a film flow of cold air adhering to the surface of the frozen food is formed by a Coanda effect, thereby obtaining a high cooling effect. Hereinafter, the outline of the apparatus disclosed in Patent Document 说明 will be described with reference to FIGS. 14 and 15. In FIG. 14, the refrigeration apparatus is formed with cooling inside the sealed casing 102 formed of the heat insulating walls 1〇4. The space s ^ is provided on the partition wall of the sealed casing, and the gates 1 〇 6, 1 〇 8 and 11 可 are opened and closed. In the sealed casing (10), the conveyor is cooled; the east food w is conveyed (4) 2. Conveyor belt (1) ]52098.doc 201200826 is constructed with an endless belt that includes the outward path 112a and the circuit 112b. An upper cold air injection portion 1丨4 is provided above the outward path 112a, and a lower cold air injection portion 116 is provided below the outward path 112a. An air cooler 118 is disposed inside the side wall of the sealed casing 1〇2, and a blower (multi-blade fan) 12 is disposed above the air cooler 118. The air cooler 118 supplies refrigerant or brine to a refrigerator unit (not shown) provided outside the sealed casing 102, thereby cooling the air in the store. The cooled in-compartment air c is sent to the upper cold air injection unit 1丨4 and the lower cold air injection unit 116 by the blower 120. As shown in Fig. 15, in the upper cold air ejecting unit 114, a plurality of slit nozzles 124 having a funnel-shaped cross section are disposed integrally with the nozzle unit ία and arranged in the lower direction of the transporting direction a of the frozen food w. Each slit nozzle 124 is extended in a direction perpendicular to the conveying direction a of the frozen food w, and is composed of an accelerating portion 12 6 including a funnel-shaped cross section and a rectifying portion (flow assisting portion) 128 constituting the same flow path area. . The injection port provided at the front end of the flow regulating portion 128 is formed with a slit-like opening that faces the direction perpendicular to the conveyance direction a. The cold air enthalpy that has been sent to the upper cold air ejecting unit 114 is accelerated by the accelerating unit 126, rectified by the rectifying unit 128, and then vertically blown to the frozen food w placed on the belt surface of the path 112a of the conveyor belt 112. Since the impact jet r sprayed on the frozen food w forms a film flow adhering to the surface of the frozen food aoW by the Coanda effect, it can be cooled by the cooling effect of the cold food. Similarly to the upper cold air ejecting unit 114, the lower cold air ejecting unit 116 integrally includes a plurality of slit nozzles 132 including an accelerating portion 152098.doc 201200826 134 having a mountain-shaped cross section and a rectifying portion 136 in the nozzle unit 130, and is oriented toward the path. The back side of the belt body sprays the impinging jet r. The cold air cooled by the frozen food w is discharged to the width direction of the conveyor belt through the exhaust space e formed between the slit nozzles, and then reaches the air cooler 118 to form a circulating flow. The belt body of the conveyor belt 112 has a configuration in which a plurality of micropores are provided to improve the fluidity of the cold air 1* sprayed from above and below, and the cooling effect is improved; and the heat transfer property including stainless steel or the like is good. The sealing body of the material is constructed, and the frozen food w is cooled by the cold air r-cooled belt to improve the cooling effect. [PRIOR ART DOCUMENT] [Patent Document 1] [Patent Document 1] International Publication No. WO 2006/046317 [Disclosure] [Problems to be Solved by the Invention] The conveyor belt for conveying the object to be cooled is required to have a processing capability. A certain width dimension. As shown in Fig. 4, since the prior refrigeration device is provided with the air cooler 118 in the lateral direction of the conveyor belt, the width of the casing is increased. Further, since the blower 12 is disposed above the air cooler to form a cold air flow from the top to the bottom, a large positive pressure space must be formed for the rectification of the cold air flow. Further, since the upper portion of the slit nozzle having the funnel-shaped cross section and the lower cold air ejecting portion 116' are disposed above and below the conveyor belt, it is necessary to take a larger space. In addition, since the circuit of the conveyor belt is disposed in the cooling space, it is necessary to increase the height of the casing in order to meet the loop requirements of 152098.doc -6 - 201200826. The prior refrigeration unit has a conduit for forming a cold air circulation stream to the left and right. For these reasons, for example, the size of the internal volume of the container that can be transported by truck or the like is 40 inches (12 m) x width 23 111 > < 25 m high, but the previous refrigeration device cannot be accommodated in such a size. Container. Therefore, it is a waste of time due to the need to disassemble and transport and reassemble on site, and the performance after reassembly is also unstable. Further, since the lower cold air injection portion has a slit nozzle having a complicated structure, the cleaning property is poor, and there are some problems in maintainability and cleanability. Further, since the upper portion of the cooling chamber is a positive pressure space which is higher in pressure than the outside air, a positive pressure is applied to the gate for the checkpoint provided in the positive pressure space. Therefore, if the door for opening the checkpoint is opened during operation, there is a danger that the durability of the checkpoint door is lowered. In order to reduce the installation space of the conveyor belt, the diameter of the rotary drum that drives the conveyor belt has to be reduced. Therefore, considering the metal fatigue of the belt including the steel strip or the like, the thickness of the belt which is slightly thicker (about 1 mm) has been used in the past, but the heat load of the belt is increased. It is difficult to cool and the cost of the belt is also increased. Further, the circuit of the conveyor belt is provided with a smashing prevention device, but the smashing prevention device does not have the original function after icing. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems of the prior art, and a first object thereof is to realize a refrigeration apparatus which can reduce the size of a casing and can be accommodated in _ without being disassembled and reassembled. χ 其 χ χ 其 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第In order to solve the above-described problems, the refrigeration apparatus of the present invention includes: a casing that forms a horizontally long cooling space surrounded by a heat insulating wall; and a cooling object conveyance that is disposed in the longitudinal direction of the cold space a conveyor belt; and a cold air circulation device including a gas cooler and a blower formed in the cooling space towel; and the refrigeration device is a continuous processor capable of cooling or freezing the object to be cooled, wherein: a pressure chamber, the housing has a rectangular cross section, the negative pressure chamber is disposed in an upper portion of the cross section, and the air cooler and the blower are disposed adjacent to each other to form a negative pressure space; and the positive pressure chamber is disposed at the negative pressure a lower portion of the chamber, and the cold air is supplied from the blower to form a normal space, and the conveyor belt and the cold air injection portion for injecting cold air from the upper and lower sides toward the conveyor belt; and a maintenance space for normal pressure are disposed in the negative pressure chamber and The side area of the positive pressure chamber receives the cold air after cooling of the object to be cooled in the middle to the middle, forming a cold which recovers the received cold air to the negative pressure chamber Reflux. In the device of the present invention, the air blower and the line cooler are disposed adjacent to the chamber, and the space of the negative pressure chamber is reduced. The housing is formed into a rectangular cross section, and a negative pressure chamber is disposed above the inner space of the housing, and is disposed below the chamber. The positive pressure chamber is configured to reduce the width dimension of the housing in the negative pressure chamber. Further, since the maintenance space of the normal pressure is disposed on the side of the negative pressure chamber and the dust chamber, and the cold air return flow path from the negative pressure chamber to the positive pressure chamber is formed in the maintenance space, the pressure loss of the cold air circulation flow is lowered. Therefore, there is no need for a large positive pressure space. Thereby, it can be set as the size which can be accommodated in the goods. & Because the maintenance space can be utilized as a checkpoint for the machine type installed in the casing, it is easy to maintain the machine in the casing of 152098.doc 201200826. In the device of the present invention, (4) the cold air port for supplying the cold air to the positive pressure chamber of the negative pressure chamber is disposed near the side wall of the casing away from the maintenance space, and the lower side of the cold air port is formed in the up and down direction. An air supply space for cooling air is supplied to the lower cold air injection unit. Thereby, it is possible to ensure a cold air flow path for supplying cold air to the cold air injection portion of the positive pressure chamber without enlarging the width dimension of the casing. Further, since the smooth cold air circulation flow can be formed in the lower positive pressure chamber to reduce the pressure loss of the cold air circulation flow, the power of the blower can be reduced. In the device of the present invention, an opening and closing door can also be provided on the side wall of the casing facing the maintenance space so that the operator can enter the maintenance space. Thereby, since the inspection point in the casing is facilitated and the opening and closing door is provided in the maintenance space facing the normal pressure, the danger of opening and closing the door can be eliminated. Moreover, the durability of the opening and closing door can be improved. In the apparatus of the present invention, the conveyor belt may include an outward path disposed in the positive pressure chamber and having both end portions disposed outside the cooling space, and the two ends are connected to the outward path and disposed below the outer side of the cooling space. The endless belt of the circuit is configured such that a rotating drum is provided outside the cooling space, and the conveyor belt is wound around the outer circumferential surface of the rotating drum to support and convey the conveyor belt. In this way, since the circuit is disposed below the outer side of the cooling space, the installation space of the positive pressure chamber can be reduced. Thereby, since the size of the casing can be reduced, the casing can be further miniaturized, thereby making it easier to accommodate the container. Further, since the circuit is disposed outside the cooling space, the tamper preventing device is less likely to freeze, and the original function can be exhibited. 152098.doc 201200826 Furthermore, since the rotary drum is provided outside the cooling space, the installation space of the rotary drum is not limited, and the rotary drum can be made larger in diameter. Therefore, since the metal fatigue of the belt body is alleviated, the thickness of the strip can be made thinner, whereby the heat load of the strip can be reduced and the cost of the strip can be saved. In the apparatus of the present invention, if the belt of the conveyor belt is formed of a metal belt having no air-conditioning dissipating holes, the cold air ejecting portion disposed below the lower portion of the conveyor belt may have a function of cooling the belt body. Therefore, the lower cold air injection portion does not need to use a slit nozzle having a funnel-shaped cross section having a long cold air reaching distance. Therefore, since the installation space of the lower cold air injection portion can be reduced, the height of the casing can be reduced, and the storage of the container can be facilitated. [Effects of the Invention] The device according to the present invention includes: a casing that forms a horizontally long cold space surrounded by a heat insulating wall; and a conveyor for conveying a cooling object disposed in a longitudinal direction of the cooling space; a cooling air circulation device including a air cooler and a blower formed in a cooling air circulation space; and a cooling device capable of continuously cooling or freezing the object to be cooled, having: a negative pressure to, the casing has a rectangular shape In the cross section, the negative pressure chamber is disposed in the upper portion of the cross section and is disposed adjacent to the air cooler and the blower to form a negative pressure chamber. The positive pressure chamber is disposed in a lower region of the negative pressure chamber and is provided by the air blower. a cooling air supply space for forming a positive pressure space, and a cooling air injection portion for conveying the cold air from the upper and lower sides toward the conveyor belt; and a maintenance chamber for the normal pressure, which are disposed in a side region of the negative pressure chamber and the positive pressure chamber, Receiving the cold air after cooling from the positive pressure to the medium to be cooled, forming a cold air returning the recovered gas to the negative pressure chamber, thereby reducing the width of the casing 152 098.doc 201200826 The size of the inch and the twist can be used to refrigerate the container in the container without disintegration. Therefore, when the money is transported to the installation site, it is possible to eliminate the time required for decomposition and reassembly without disassembling and reassembling, and the performance of the assembly is reduced. Further, since the f-pressure maintenance (four) is arranged, the operator can freely enter the maintenance space, thereby facilitating maintenance of the machine in the casing. Since the cooled cold air is returned to the negative waste chamber through the maintenance space, a smooth cold air circulation flow can be formed, thereby reducing the pressure loss of the cold air circulation flow and reducing the power of the blower. [Embodiment] Hereinafter, the present invention will be described in detail using the embodiments shown in the drawings. However, the dimensions, materials, shapes, relative orientations, and the like of the components described in the embodiments are not specifically described, and the scope of the present invention is not limited thereto. An embodiment of the apparatus of the present invention will be described with reference to Figs. 1 to 13'. First, Fig. 4 illustrates the overall configuration of the refrigeration apparatus 1 of the present embodiment. The refrigeration unit 1 is constructed by a casing 12 which is formed by a heat insulating wall & Further, in Fig. 2, the front side wall and the upper side wall of the casing n are broken to allow the internal structure to be observed. Further, in Fig. 3, the front side wall of the left half of the casing is removed based on the same object @'. <The housing 12 is sealed* 152098.doc 201200826 le except for the population opening 14, 2° of the conveyor belt provided on the inlet wall (1), which is placed outside the outlet opening 16 of the conveyor belt of the outlet wall 12d. A plurality of windows 18 for monitoring are disposed on the front wall 12a in the longitudinal direction of the casing 12. A plurality of opening and closing doors 2 are provided in the rear wall 12b so that the operator can enter the casing 2. The upper wall portion 12e of the casing 12 is a sealing wall through which a supply pipe 22 for supplying refrigerant or brine to the air cooler from a cold/east unit (not shown) and a discharge pipe 24 for discharging refrigerant or brine are passed. The bottom wall 12 of the casing 12 is supported on the ground 1 by the spacing of the feet 26. A conveying device 3 that conveys the frozen food w to the casing 2 is provided at a lower portion of the casing 12. The conveying device 30 includes an endless conveyor belt 32, and is composed of a rotating stainless steel plate that drives the conveyor belt 32 and a 36° conveyor belt 32, which are made of a thin stainless steel plate having good heat transfer properties, and has a sealing structure without air-conditioning dissipating holes. The conveyor belt 32 is wound around the driven drum 34' on the outside of the inlet wall i2c and coiled on the outside of the outlet wall 12d. The outward path 32a of the conveyor belt 32 is disposed in the horizontal direction and is disposed in the casing 12 from the inlet opening 14 and the outlet opening 16, and moves in the direction of the arrow a. The circuit 32b is disposed in a space below the bottom wall 12f. As shown in Fig. 1, the housing 12 has a rectangular cross section. The casing 12 is partitioned by a partition wall 38 and 40 into a negative pressure chamber 42, a positive pressure chamber 44, and a maintenance space 46 disposed on the side. The negative pressure chamber 42 is disposed in the upper portion of the casing 12 and has an air cooler 48 fixed to the partition wall 38. The air cooler 48 is connected to a refrigerator unit of a schematic type which is disposed separately from the casing 12 via the above-described supply and discharge pipes 22 and 24. Further, a circular 152098.doc 201200826 air passage 38a is formed adjacent to the air cooler 48 in the partition wall 38. A cylindrical cover 50 is attached to the air passage 38a, and an axial fan 52 and a drive motor 54 are disposed in the cover 50. As shown in Figs. 3 and 4, the air cooler 48 is provided with two units in the longitudinal direction of the casing 12, and the axial fan 52 is in the longitudinal direction of the casing 12 each! There are 4 unit settings. Further, the in-compartment air cooled by the air cooler 48 is sent from the air passage 38a to the positive chamber 44 by the axial fan 52. Therefore, the negative pressure chamber 42 is a negative pressure atmosphere. As shown in Fig. 5, the positive pressure chamber 44 is disposed in a region below the negative pressure chamber 42, and the two are separated by a partition wall 38. In the positive waste chamber 44, the outward path 32a of the conveyor belt 32 is disposed in the horizontal direction. The outward path 32a is disposed at a specific height by a plurality of support bars 56 provided in the width direction. Above the two sides of the outward path 32a of the conveyor belt 32, support frames 58 and 60 are disposed in the longitudinal direction of the casing 12. Above the outward path 32a, an upper cold air injection portion 62 is provided along the outward path 32a in the transport direction a of the conveyor belt 32. The upper cold air injection portion 62 includes a plurality of nozzle units 64, and the lower portion of the nozzle unit 64 is integrally formed with four slit nozzles 64a having the same configuration as the slit nozzles 124 shown in FIG. 15, and the upper portion of the nozzle unit 64 is formed with Flange 64b. The flange 64b is placed and supported on the support frames 58, 6〇. A slit-like cold air injection port disposed in the width direction of the outward path 32a is formed at the lower end of the slit nozzle 64a. Below the outward path 32a, a lower cold air injection portion 66 is provided along the outward path 32a. The lower cold air injection portion 66 is constituted by a box-shaped cover 68 having a cold air flow inlet 68 & The box-shaped cover 68 is fixed to the upper surface of the bottom wall i2f, and the upper surface 68b of the box-shaped cover 68 is formed as a flat surface, and is provided with a plurality of cold air ejection ports 70 of a circular shape 152098.doc 201200826. The upper surface 68b and the bottom wall 12f are inclined downward toward the side of the maintenance space 46 substantially in parallel with each other. Next, the configuration of the side of the inlet wall 12c of the conveying device 30 will be described with reference to Figs. 6 and 7 . The frame 72 is coupled to the inlet wall 12c of the housing 12 and is supported in the horizontal direction by the feet 26. The cylindrical driven roller 34 is disposed in the horizontal direction, and a conveyor belt 32 is wound around the driven roller 34. The surface of the driven roller 34 is covered with a rubber material. Both ends of the rotating shaft 34a of the driven roller 34 are rotatably supported by bearings 74. The bearing 74 is slidably supported by the frame 72 in the direction of the arrow a or b, and is attached to the frame 72 via the coil spring 76. Thereby, the driven roller 34 can be moved in the direction of the arrow a or b to adjust the tension of the conveyor belt 32. A reinforcing rod 79, a support rod 80 supporting the circuit 32b of the conveyor belt 32, and a guide rod 82 for guiding the circuit 32b are disposed between the frames 72. Next, the configuration of the outlet wall i2d side of the conveying device 3A will be described with reference to Figs. 8 and 9'. In Figs. 8 and 9, the frame 84 is fixed to the outlet wall i2d, and the rotating shaft 36a of the driving drum 36 is rotatably supported by the frame 86 via the bearing 86. Further, a driving motor for driving the rotating shaft 36a is mounted on the frame 84. 88. The belt 32 is wound around the driving drum 36, and the belt 32 is moved in the direction of the arrow a or b by the rotation of the driving drum 36. Similarly to the driven drum 34, the outer surface of the driving drum 36 is covered with a rubber film. Further, on the back side of one side edge of the stainless steel plate constituting the conveyor belt 32, a rubber projection 33 having a tapered trapezoidal cross section is vulcanized. On the other hand, on one side end surface of the driven roller 34, a pulley 77 having a concave portion 77a on the outer peripheral surface is joined, and the end surface of the concave portion 77a and the driven roller 34 is formed to be in contact with the rubber projection 152098.doc 201200826 The concave portion of the rubber belt (4) will be slid into the groove and slide in the concave portion. The pulley 77 for forming the concave portion 77a is also attached to one side of the drive roller 36, and the rubber dog 33 and the pulley 77 constitute a flaw preventing device 78. The rubber projections 33 are fitted on the concave portion 77a and the conveyor belt 32 is advanced, thereby preventing the conveyance belt 32 from being smashed. In the above configuration, on the side of the inlet wall 12c of the conveying device 30, the operator places the frozen food w on the belt surface of the outward path 32a of the conveyor belt 32. The frozen food w placed on the belt surface is conveyed from the inlet opening 14 to the positive pressure chamber 44 in the casing 12. On the other hand, in the operation of the air cooler 48 and the axial fan 52 in the casing (2), the cold air (c) cooled by the air cooler (48) is sent to the positive pressure chamber (44) through the air passage (38a) through the axial flow fan (52). In the positive pressure to 44, the cold air c is ejected from the upper and lower sides of the outward path 32a toward the frozen food. The upper cold air ejecting unit 62 ejects the impact jet r of the right-angle slit shape from the frozen food w from the slit-like ejection opening ' of the slit nozzle 64a. As described above, the slit nozzle 64a includes an accelerating portion having a tapered cross section for accelerating the cold air c and a rectifying portion (assisted portion) for rectifying the accelerated cold air c, and is capable of ejecting a jet having a long reach distance. . Since the impinging jet jet ejected from the slit nozzle 64a can form a cold air current which is in close contact with the surface of the frozen food w by the Coanda effect, the cooling effect can be improved. The lower air-cooling nozzle portion 66 injects the cold air c from the cold air injection port 70 provided on the upper surface 68b of the cover 68 to the lower surface of the outward path 32a. The arrival distance of the cold air c is 6 times the aperture of the cold head injection port 70. Since the cold air injection port 7〇 is a large 152098.doc •15·201200826 diameter, the arrival distance of the cold air C becomes longer, and even if the upper 68b is inclined, the cold air c can be extended to the entire width direction of the outward path 32a to reach the lower side of the outward path 32a. . Further, since a wide exhaust space e formed between the slit nozzles 2 can be taken, since the cooled cold air can be smoothly discharged from the food conveyance w, the exhaust air does not disturb the impact jet. Further, in Fig. 16, as a comparative example, a cold air ejecting portion having a rectangular nozzle portion 152 and a perforated upper portion cold air ejecting portion 150 is provided on the front end flat ejection surface 154. In this configuration, if the height h between the rectangular nozzle portion 152 and the distance p between the rectangular nozzle portions 152 are not substantially taken, the exhaust space e ° cannot be sufficiently ensured, so that the exhaust air remains in the vicinity of the impact jet , disturbing the impact of the jet r, and there is damage to the cooling effect. On the other hand, if the pitch P is relatively large, the area where the impinging jet r is not blown to the food conveying material w is increased, so that the cooling effect is lowered. Therefore, in the comparative example, it is understood that the cooling effect β is less likely to be obtained. The lower cold air ejecting unit 66 ejects the cold air enthalpy from the cold air ejecting port 70 provided on the upper surface 6 of the box-shaped cover 68 to the lower surface of the outward path 32a. Since the cold air injection port has a large diameter, the arrival distance becomes long, and even if the upper portion 68b is inclined, the distance from the cold air injection port 70 to the lower portion of the belt increases, and the cold air c can also reach below the outward path 32a. Therefore, there is no case where the cooling effect on the metal strip 32 is lowered. According to the present embodiment, since the casing 12 is formed in a rectangular cross section, a negative pressure is placed on the upper portion of the internal space at 152098.doc •16·201200826. The chamber 42 is provided with a positive pressure chamber 44, and an axial fan 52 and an air cooler 48' are disposed adjacent to the negative pressure chamber, so that the width dimension of the housing can be reduced. Further, since the cold air passage for introducing the cold air c into the box-like cover 66 is formed in the vertical direction below the air passage 38a, it is not necessary to provide the front wall 12a with a projection for the cold air flow path. Further, since the cold air ejecting portion 62 of the upper portion of the slit nozzle 64a having a large cooling effect and the cold air ejecting portion 66 at the lower portion of the box-shaped cover 68 including the retractable installation space are included, the frozen food can be cooled at a high level. The effect 'simplifies the installation space of the cold air injection part. Further, since the driven roller 34, the driving roller 36, and the return path 32b of the metal strip 32 are disposed outside the casing 12, the degree of retraction of the conveyor belt 32 can be reduced in these portions. Therefore, as shown in Fig. 1A, the container 90 of the above size can be accommodated without being disassembled. Therefore, when transported to the installation site, the time required for the decomposition and reassembly of the refrigeration device 10 can be saved, and the performance degradation caused by reassembly can be avoided. Further, since the driven roller 34 and the driving roller 36 are disposed outside the casing 12, the diameter of the rollers can be increased. H can set the roller diameter of the conveyor belt 32 including the stainless steel plate without causing damage due to metal fatigue (band thickness) About 1000 times). Thereby, the metal fatigue of the conveyor belt 32 can be alleviated because the bending load applied to the conveyor belt 32 can be alleviated. Therefore, the belt can be thinned to reduce the belt cost. For example, in the present embodiment, the thickness of the stainless steel plate constituting the conveyor belt 32 can be set to 0.6 mm. Further, since the upper surface 68b of the phase cover 68 and the bottom wall 32f of the casing 12 are inclined toward the rear wall 32b side of the 152098.doc -17-201200826, the washing water is not accumulated on the upper surface and the bottom wall. Part 12f. Further, since the side wall of the inclined lower side of the box-shaped cover body 28 is formed by the door 28c which can slide up and down, the operator can slide the door 28c upward when washing, so that it can be easily drained from the box-shaped cover body 28. Clean water. This improves the cleanliness of the sealed space. Further, since the diameter of the cold air injection port 70 which is bored on the upper surface 68b of the box-like cover 68 is larger than 25 ππηφ, the reaching distance of the cold air c is large. Therefore, even if the interval between the cold air injection port 70 and the underside of the belt becomes large, the cooling effect of the conveyor belt 32 can be maintained at a high level. Fig. 11 is a line diagram showing the results of experiments conducted by the apparatus of the present embodiment on the relationship between the heat transfer rate from the cold air injection port 70 to the lower surface of the belt and the heat transfer rate to the metal strip. In the present embodiment, the upper surface of the box-shaped cover 68 is tilted and the interval from the cold air injection port 70 to the lower portion of the belt varies from 75 to 95. As can be seen from the figure, even if the interval between the cold air injection port 7〇 and the underside of the belt changes, the heat transfer rate to the belt does not change much. Therefore, as shown in the present embodiment, it is understood that the cooling effect of the conveyor belt 32 hardly decreases even if the upper surface 68b is inclined. Fig. 1 2A shows a box-shaped cover 68 of the present embodiment. Since the upper surface 68b of the box-shaped cover 68 is inclined toward the width direction of the conveyor belt 32, the interval % from the cold air injection port 70 to the conveyor belt 32 varies between 75 mm and 95 nm. The circular cold air injection port 70 has a diameter of 25 mm <|), and each of the cold air injection ports 70 is arranged in a regular square shape. The distance between Pi and the air injection ports is 100 mm. On the other hand, Fig. 12B is a configuration shown as a comparative example. In the box cover 152098.doc 201200826, the body 68 is provided with a plurality of exhaust spaces e, and the box-shaped cover ", the flat ejection surface 68b, is spaced apart from the conveyor belt 32 by "mm, and the width of the conveyor belt ^ is fixed. A circular air-injection port 70' having a diameter of 12 5 mm (|) is disposed on the flat spray surface 68b, and each of the cold air injection ports 7' is arranged in an equilateral triangle with each other, and each of the cold air injection ports is 7 The distance between them is p2g5〇mm. Further, the flat ejection surface 68b and the flat ejection surface 68 have the same aperture ratio. The results of the experiment using the cold air ejecting mechanism including the above-described two kinds of box-shaped covers, using 筠篛 as the food conveying material w' and cooling effect of the crucible are shown in Fig. 13 . In the figure, the curve X is the case where the box-shaped cover 68 is used, and the curve Y is the case where the box-shaped cover 68' is used. Further, the curve z is the temperature transition of the cooling space. The curve W is the transition of the outside air temperature. Furthermore, the temperature of the crucible is measured by a temperature sensor that penetrates the center of the crucible. As is apparent from Fig. 13, in the case of using two kinds of box-shaped covers, the cooling effect of the crucible hardly changes. Moreover, the same result can be obtained even if the experiment is carried out after packaging the mash. Therefore, it is understood that the box-shaped main body 6.8 of the present embodiment in which the exhaust space e is not formed is used, the structure is simple, the processing is easy, and the processing cost can be saved. Further, according to the present embodiment, since the maintenance space 46 that the operator can enter from the opening and closing door 20 is provided, maintenance in the casing 12 is facilitated. Further, since the opening and closing door 2 is provided in the maintenance space 46 of the normal pressure, there is no danger even if the opening and closing door 20 is opened during the operation of the apparatus. Further, since the axial flow fan 52 is provided to form the cold air circulation flow, the number of installations can be reduced as compared with the multi-blade fan, and the power consumption can be saved by about 152098.doc -19-201200826 30%. [Industrial Applicability] According to the present invention, it is possible to realize a miniaturization of the casing of the refrigeration apparatus, which can be accommodated in the container without being decomposed, and the refrigeration apparatus required for the transportation can be greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing an embodiment of a refrigeration apparatus according to the present invention. Fig. 2 is a perspective view of the refrigeration apparatus of the above embodiment. Figure 3 is a plan view of the above refrigeration device. Fig. 4 is a plan sectional view taken along line A-A of Fig. 3. Fig. 5 is a perspective view of the cold air injection mechanism of the above refrigeration unit. Fig. 6 is a plan view showing the driving portion of the metal belt driving device of the above-described refrigerating apparatus. Figure 7 is a side view of the drive portion of Figure 6. Figure 8 is a plan view showing the driven portion of the above-described metal belt driving device. Fig. 9 is a side view of the above-described driven portion. Fig. 10 is a perspective view showing the above-described refrigeration device in a container. Fig. 11 is a graph showing the relationship between the height of the cold air ejecting portion of the lower portion of the above-described cooling device and the heat transfer rate of the metal strip. Fig. 12A is a perspective view showing the structure of the box-shaped cover of the above embodiment. Fig. 12B is a perspective view showing the configuration of a box-shaped cover as a comparative example. Fig. 13 is a line diagram showing the cooling effect of the food material of the above embodiment and the comparative example. 152098.doc •20· 201200826 Figure 14 is a cross-sectional view of a prior refrigeration device. Figure 15 is an explanatory view of a cold air injection mechanism of the prior refrigeration apparatus. Fig. 16 is an explanatory view of a cold air injection mechanism as a comparative example. [Main component symbol description] 10 Refrigeration device 12 Housing 12a Front wall 12b Rear wall 12c Entrance wall 12d Exit wall 12e Upper wall 12f Bottom wall 14 Entrance opening 16 Exit opening 18 Monitoring window 20 Opening and closing door 22 Supply pipe 24 Discharge Tube 26 foot 30 conveying device 32 endless belt 32a outward path 32b circuit 33 rubber protrusion 152098.doc -21 - 201200826 152098.doc 34, 36 rotating drum 34a rotating shaft 38 ' 40 partition wall 38a ventilation path 42 negative pressure chamber 44 positive Pressure chamber 46 Maintenance space 48 Air cooler 50 Cover 52 Axial fan 54 Drive motor 56 Support rod 58 ' 60 Support frame 62 Upper cold air injection portion 64 Nozzle unit 64a Slot nozzle 64b Flange 66 Lower cold air injection portion 68 ' 68 , box-shaped cover 68a cold air inlet 68b upper 70 cold air injection port 72 frame 74 bearing Joe -22 - 201200826 76 77 77a 78 79 80 82 84 86 88 90 100 102 104 106 , 108 , 110 112 112 a 112b 114 116 118 120 • 122, 130 124 ' 132 Coil spring pulley recess 婉蜒 prevent device reinforcement Support rod guide rod frame bearing drive motor container refrigeration device seal housing insulation wall inspection point door conveyor belt go circuit cold air injection part lower air injection part air cooler blower nozzle unit slit nozzle • 23· 152098.doc 201200826 126 , 134 Acceleration portion 128' 136 Rectifier portion 150 Upper cold air injection portion 152 Rectangular nozzle portion 154 Flat ejection surface a Transport direction e Exhaust space h Height P Spacing r Impact jet t Film flow w Frozen food 152098.doc · 24·