1225144 五、發明說明（1 ) 發明之領域 本發明是關於一種熱交換器用附有散熱片之管，其係用 來製造如冰箱或展示櫃等冷卻裝置之蒸發器用之熱交換器， 及熱交換器，熱交換器用附有散熱片之管的製造方法，及 熱交換器之製造方法。 先前之枝術說明 冰箱或展示櫃等之冷卻裝置之蒸發器方面，係使用一種 熱交換器，其係由髮夾狀管，及在直管部之長度方向上配 置節距、且插入髮夾狀管之兩直管部上固定之複數個平行 之板狀散熱片形成之散熱片群所構成的熱交換器用附有散 熱片之管，其在未設置有散熱片群之複數個位置上被彎曲， 而使全體被形成蛇行狀。 習知上，此等熱交換器是以下列之2個方法所製造。 第1個方法敘述如下。即，首先準備2支直管，及形成 二個通孔且以節距設置之複數個板狀散熱片，並且準備在 線的一端裝有擴管用球之擴管具。然後，使兩支直管分別 穿過所有的板狀散熱片之兩個通孔，因而使複數個平行之 板狀散熱片所形成之散熱片群、在管之長度方向上以複數 個成間隔設置。其次，擴管具之線從另一端側通過管中， 而且從另一端側拉住線而使擴管用球通過管內，使管擴張， 因而使散熱片群之板狀散熱片被固定在管的周圍。其次， 利用兩管的一端與U彎頭之兩端進行焊接，使，而製成兩 管之間以U彎頭連結之熱交換器用附有散熱片之管。其後， 1225144 五、 發明說明（ 2) 在 熱 交 換 器用 附有散熱片之管上未設置有散熱片群之複數 個 地 點 上 進行折曲，因而使全體被形成蛇行狀。因此，可 製 造 出 熱 交換 器。’ 然 而 9 最近冰箱或展示櫃等之冷卻裝置中，習知之氟系 冷 媒 將 檢 討以 使用對臭氧層破壞或地球溫暖化之影響少之 碳 化 氫 系 冷媒 所取代，由於碳化氫系冷媒具有可燃性之故， 必 須 極 力 抑制 冷媒的洩露。 但 是 上述 第1個方法所製造之熱交換器中，有下列之 問 題 〇 即 ，管 及U彎頭進行焊接、而熱交換器用附有散熱 片 之 管 因 爲存在有接縫，所以此部分會有冷媒洩露之虞。 而 且 爲 了使傳熱面積增大而使冷卻效率提高，因此在管 之 內 面 例如 預先在圓周方向上、以間隔配置有複數個在 管 的 長 度 方向 上延伸之內散熱片之情況，當內散熱片之高 度 太 高 時 ，擴 管時被球造成的潰倒比率會變大，因此冷媒 之 流 動 抵抗變 大，並且冷卻性能會降低。從而，無法使內 散 熱 片 之 高度 做成太高，傳熱面積增大的效果變少，而使 冷卻 效 率 之提 高有一個限度。 而 且 下面 將敘述冰箱或展示櫃等之冷卻裝置之蒸發器 所用 之 熱 交換 器的第2製造方法。即，首先準備髮夾狀管， 及形 成 二 個通 孔且設有節距之複數個板狀散熱片，而且準 備 在 壓 入 棒之前端裝有擴管用心軸之擴管具。然後，使髮 夾狀 管 之 兩直 管部分別穿過所有的板狀散熱片之兩貫通孔， 因 而使 複 數個 平行之板狀散熱片形成之散熱片群、以複數 -4- 1225144 五、發明說明（3) 個而設有間隔地被設置在管之長度方向上。其次，將擴管 具之擴管心軸從髮夾狀管之兩端開口壓入、而將直管部進 行擴管，因而使散熱片群之板狀散熱片被固定在管的周圍 。其後，在熱交換器用附有散熱片之管上未設有散熱片群 之複數個地點上進行折曲，因而將全體形成蛇行狀。 上述第2個方法所製造之熱交換器中，熱交換器用附有 散熱片之管的髮夾狀管上沒有存在接縫之故，因而不會產 生如第1個方法所製造之熱交換器之冷媒洩露。但是，第 2個方法所製造之熱交換器中，亦有下列之問題。即，爲 了使傳熱面積增大而使冷卻效率提高，因此在管之內面， 例如預先在圓周方向上、以間隔配置有在管的長度方向上 延伸之複數個內散熱片之情況，當內散熱片之高度太高時， 擴管時由心軸所造成內散熱片之潰倒比率會變大，因而使 冷媒之流動抵抗變大，並且冷卻性能會降低。從而，無法 使內散熱片之高度做成太高，而使傳熱面積增大的效果變 少，因而冷卻效率之提高有一個限度。 因而，爲了防止內散熱片之潰倒之目的，上述第2方法 中，考慮使髮夾狀之兩直管部中以導入壓力流體而進行全 體擴管。然而，在此情況下，在未設置有散熱片群之部分 上，管之周壁會產生折皴，使管在長度方向上變形，熱 交換器用附有散熱片之管的長度會產生變動，因而無法獲 得所需尺寸之熱交換器。而且，雖然在熱交換器用附有散 熱片之管上未設置有散熱片群之複數個地點上進行折曲， 1225144 五、發明說明（4) 但是在此處產生折皺之時，進行折曲加工會使管之內散熱 片產生潰倒之虞。而且，在擴管前之狀態中，髮夾狀管之 直管部上未設置有散熱片群之部分，及設置有散熱片群之 部分均未受拘束之故，在導入壓力流體而進行擴管之時， 直管部之全長會有很大的撓曲產生之問題。再者，髮夾狀 管中未設置有散熱片群之部分在擴管之時會有破裂之虞。 本發明之目的在提供一種熱交換器，其可解決上述問題， 不僅可抑制冷媒的洩露，而且可獲得所需要之冷卻性能。 發明之扼要說明 本發明之熱交換器用附有散熱片之管，其係：跨越髮夾 狀管之兩直管部上固定之複數個平行板狀散熱片所形成之 複數個散熱片群、間隔地設置在直管部之長度方向上，其 特徵爲：板狀散熱片上形成有二個插管用之設有間隔之通 孔，髮夾狀管之兩直管部分別穿過插管用之貫通孔，而且 髮夾狀管係以流體進行擴管，而將板狀散熱片固定在髮夾 狀管之擴管部周圍，髮夾狀管之兩直管部上相鄰之2個散 熱片群之間、分別設置有無散熱片之部分，各直管部上所 有無散熱片之部分中至少有一個設置有直徑比擴管部更小 、且爲預定長度之被拘束小徑部。 本發明之熱交換器用附有散熱片之管，因爲具有髮夾狀 管之故，並不存在有接縫，因而可抑制使用該熱交換器用 附有散熱片之管的熱交換器中之冷媒洩露。從而，可使用 對臭氧層破壞或地球暖化影響很少之碳化氫系冷媒。而且， 1225144 五、發明說明（5) 板狀散熱片係利用流體之擴管作用而被固定在髮夾狀管之 直管部周圍，因此在髮夾狀管之內周面上以傳熱面積增大 爲目的，即使在形成突出高度較高的內散熱片之時，亦不 會造成擴管時內散熱片之潰倒，因而可獲得所需要之冷卻 性能（熱交換性能）。再者，髮夾狀管之各直管部上所有的 無散熱片之部分之中至少有一個設置有直徑比擴管部更小 且爲預定長度之被拘束小徑部，以流體進行擴管之時q被 拘束小徑部可被拘束之故，在擴管前之狀態中，髮夾狀管 之直管部中未被拘束之部份的長度變成比較短。從而，可 防止擴管時在直管部上產生很大的撓曲。 本發明之熱交換器用附有散熱片之管中，髮夾狀管之各 直管部之所有無散熱片之部分上，分別設置有被拘束小徑 部。 Vlit情況下，以流體進行擴管之時，被拘束小徑部可被拘 束，因此在擴管前之狀態中，髮夾狀管之直管部中被拘束 之部份的長度變成比較長。從而，可防止擴管時在直管部 上產生很大的撓曲。 本發明之熱交換器用附有散熱片之管中，被拘束小徑部 之兩端係藉由朝向擴管部側之擴徑的推拔部而連接到擴管 部。 此情況下，被拘束小徑部之兩端藉由朝向擴管部側之擴 徑的推拔部而連接到擴管部，因此髮夾狀管在擴管時，可 將構成散熱片群之所有板狀散熱片被確實地固定在擴管部 1225144 五、 發明說明 (6) 之 周圍。 本發明之 熱交換器用附有散熱片之管中，被 拘束 小 徑 部 爲非擴管 部。 ， 此情況下 ，爲了製造熱交換器，熱交換器用附 有散 熱 片 之 管在折曲 之時，係在非擴管部上進行折曲。非 擴管 部 上 並 未進行前 工程加工之故，因而不會產生加工硬化， 其 結 果 可容易進 行地進行折曲加工。 本發明之 熱交換器用附有散熱片之管中，在髮 夾狀 管 之 內 周面上， 有沿著其長度方向上延伸之內散熱片 在圓 周 方 向 設有間隔 而一體地形成。 此情況下 ，可使採用該附有散熱片之管所製造 之熱 交 換 器 的熱交換 性能提高。 形成有內 散熱片的熱交換器用附有散熱片之管 中， 在 圓 周 方向上設 置有從髮夾狀管之內周面突出之不同 高度 的 高 低 2種內散 熱片，高的內散熱片之突出高度爲〇 • 7〜1 , ,7 公 厘 ，低的內 散熱片之突出高度爲0.4〜1.2公厘。 此情況下 ，使用此附有散熱片之管所製造之熱 父換 器 具 有 熱交換性 能提高之優異效果。 在形成內 散熱片的熱交換器用附有散熱片之管 中， 所 有 內 散熱片之 高度均爲相等，內散熱片從髮夾狀管 之內 周 面 突 出的高度 爲0 . 7〜1 . 2公厘。 在此情況下，使用此附有散熱片之管所製造之 熱交 換 器 具 有熱交換 性能提高之優異效果。 -8- 1225144 五、發明說明（7) 在形成內散熱片的熱交換器用附有散熱片之管中，內散 熱片之節距爲0.4〜1.6公厘。 而且，在形成有內散熱片的熱交換器用附有散熱片之.管 中，髮夾狀管之外徑爲6〜10公厘，同一管之周壁的肉厚 爲0.4〜0 . 8公厘。 本發明之熱交換器，如申請專利範圍第1項之熱交換器 用附有散熱片之管，其髮夾狀管之直管部的長度方向上之 在同一位置上之二個無散熱片之部分上在同方向被彎曲， 同時和髮夾狀管之直管部的長度方向相鄰之無散熱片之部 分的折曲方向不同，而使全體被形成蛇行狀。 依照本發明之熱交換器，可達成在熱交換器用附有散熱 片之管所敘述者同樣的效果。 在本發明之熱交換器中，在熱交換器用附有散熱片之管 的髮夾狀管之各直管部上之所有無散熱片之部分上，分別 設置有被拘束小徑部，熱交換器用附有散熱片之管在所有 無散熱片之部分的被拘束小徑部上被折曲。 此情況下，以流體進行擴管之時，被拘束小徑部可被拘 束而全部未被擴管，或者僅少數被擴管之故，使該部份之 加工量爲0或很少，因此加工硬化之比率變成很小。從而， 可以容易地進行折曲加工。 在本發明之熱交換器中，在熱交換器用附有散熱片之管 的內周面上一體地形成有沿著其長度方向上延伸、在圓周 方向上設有間隔的內散熱片。此情況下，可使熱交換器之 1225144 五、發明說明（8) 熱交換性能提高。 在熱交換器用附有散熱片之管的髮夾狀管上形成有內散 熱片.之熱交換器中，在圓周方向上設置有從髮夾狀管之內 周面突出的不同高度之高低2種內散熱片，高的內散熱片 之突出高度爲0.7〜1.7公厘，低的內散熱片之突出高度爲 0 · 4〜1 · 2公厘。此情況下，可使熱交換器之熱交換性能更 優異。 在熱交換器用附有散熱片之管的髮夾狀管上形成有內散 熱片之熱交換器中，所有內散熱片之高度均爲相等，內散 熱片從髮夾狀管之內周面的突出之高度爲0.7〜1.2公厘。 此情況下，可使熱交換器之熱交換性能更優異。 在熱交換器用附有散熱片之管的髮夾狀管上形成有內散 熱片之2個熱交換器中，內散熱片之節距爲0.4〜1.6公厘。 而且，在熱交換器用附有散熱片之管的髮夾狀管上形成 有內散熱片之兩個熱交換器中，髮夾狀管之外徑爲6〜10 公厘，同一管之周壁的肉厚爲0.4〜0.8公厘。 本發明之一種冰箱，其具有：具備壓縮機，凝結器及蒸 發器之冷凍循環，蒸發器爲如申請專利範圍第1 0〜1 8項中 任一項之熱交換器所形成，以使用碳氫系冷媒做爲冷媒， 其冷媒循環量爲1〜9公斤/小時。 本發明之一種展示櫃，其具有：具備壓縮機，凝結器及 蒸發器之冷凍循環·，蒸發器爲如申請專利範圍第10〜18項 中任一項之熱交換器所形成，以使用碳氫系冷媒做爲冷媒， -10- 1225144 五、發明說明（9) 其冷媒循環量爲1〜9公斤/小時。 本發明之熱交換器用附有散熱片之管的製造方法，其特 徵爲：準備髮夾狀管，及形成二個插管用之貫通孔且以節 距設置之複數個板狀散熱片，將髮夾狀管之兩直管部分別 穿過所有板狀散熱片之插管用貫通孔，使兩支直管分別穿 過所有的板狀散熱片之兩個通孔，而使複數個平行之板狀 散熱片所形成之散熱片群、在管之長度方向上以複數個成 間隔設置，同時預先在相鄰之兩個散熱片群之間分別設置 有無散熱片之部分，髮夾狀管之各直管部上所有無散熱片 之部分之中至少有一個、係以具有直徑比板狀散熱片之插 管用貫通孔之內徑更小的小直徑圓筒形拘束部之拘束用模 具進行拘束，在此狀態下、將流體導入髮夾狀管之兩直管 部中而進行擴管，而使各散熱片群之板狀散熱片被固定在 髮夾狀管之直管部周圍。 依照本發明之熱交換器用附有散熱片之管的製造方法， 可將具有上述效果之熱交換器用附有散熱片之管較簡單地 被製造出。而且，髮夾狀管之各直管部上所有無散熱片之 部分之中至少有一個、係以具有直徑比板狀散熱片之插管 用貫通孔之內徑更小的小直徑圓筒形拘束部之拘束用模具 進行拘束，在此狀態下將流體導入髮夾狀管中進行擴管之故， 因而可防止擴管時髮夾狀管之直管部產生很大的撓曲。 在本發明之熱交換器用附有散熱片之管的製造方法中， 髮夾狀管之各直管部上所有無散熱片之部分係以拘束用模 -11- 1225144 五、發明說明（1〇) 具預先進行拘束。此情況下，可確實地防止擴管時在髮夾 狀管之直管部上產生很大的撓曲。而且，可防止髮夾狀管 .中未存在有散熱片群之部份在擴管時產生破裂。 在本發明之熱交換器用附有散熱片之管的製造方法中， 拘束用模具有‘由：預定長度之圓筒形拘束部，以及設置成 與拘束部之兩端相連，並且朝向長度方向的外方進行擴徑 之二個推拔部，以及設置成與推拔部之大端部相連，而且 具有比板狀散熱片之貫通孔的內徑更大內徑之擴管許可部 所形成之空間。 在本發明之熱交換器用附有散熱片之管的製造方法中， 拘束部具有與擴管前之髮夾狀管外徑相等之內徑。此情況 下，製造後之熱交換器用附有散熱片之管的無散熱片部份 上所存在之被拘束小徑部爲非擴管部，在製造熱交換器而 將熱交換器用附有散熱片之管折曲時，係在非擴管部上進 行折曲。於前工程中並未在非擴管部上進行加工之故，因 此不會產生加工硬化，其結果可以容易地進行折曲加工。 在本發明之熱交換器用附有散熱片之管的製造方法中， 在髮夾狀管的內周面上一體地形成有沿著其長度方向上延 伸、在圓周方向上設有間隔的內散熱片。此情況下，將壓 力流體導入以進行擴管之時，各散熱片群之板狀散熱片可 固定於髮夾狀管之直管部的周圍，因此可防止擴管時其內 散熱片產生潰倒，因而使採用熱交換器用附有散熱片之管 所製造之熱交換器的熱交換性能成爲優異。 -12- 1225144 五、發明說明（11 ) 在髮夾狀管上形成內散熱片之熱交換器用附有散熱片之 管的製造方法中，在周方向上設置有從髮夾狀管之內周面 突出的不同高度之2種高低之內散熱片，高的內散熱片之 突出高度爲0.7〜1.7公厘，低的內散熱片之突出高度爲 0.4〜1 . 2公厘。 而且，在髮夾狀管上形成內散熱片之熱交換器用附有散 熱片之管的製造方法中，所有內散熱片之高度均爲相等， 內散熱片從髮夾狀管之內周面突出之高度爲〇· 7〜1.2公厘。 髮夾狀管上形成內散熱片之2個熱交換器用附有散熱片 之管的製造方法中，內散熱片之節距爲〇·4〜1.6公厘。 再者，在髮夾狀管上形成有內散熱片之2個熱交換器用 附有散熱片之管的製造方法中，髮夾狀管之外徑爲6〜10 公厘，同一管之周壁肉厚爲0.4〜0.8公厘。 在本發明之熱交換器之製造方法中，其特徵爲：如申請 專利範圍第21項之方法所製造之熱交換器用附有散熱片 之管，其在髮夾狀管之直管部的長度方向之相同位置上之 二個無散熱片之部分係在同方向被彎曲，同時與髮夾狀管 之直管部的長度方向相鄰之無散熱片之部分的彎曲方向不 同，而使全體被形成蛇行狀。 依照本發明之熱交換器之製造方法，可達成在熱交換器 用附有散熱片之管所敘述同樣的效果。 在本發明之熱交換器之製造方法中，使用如申請專利範 圍第22項之方法所製造之熱交換器用附有散熱片之管， -13- 1225144 五、發明說明（12 ) 係將此熱交換器用附有散熱片之管、預先在其無散熱片之 部分上、以拘束用模具之拘束部實施拘束之被拘束部份上 折曲。 此情況下，在熱交換器用附有散熱片之管折曲之時，係 在被拘束部份上進行折曲。被拘束部份在進行擴管之時全 部未被擴管，或者僅少數被擴管之故，使該部份之加工量 爲0或很少，因此加工硬化之比率變成很小。從而，可以 容易地進行折曲加工。 在本發明之熱交換器之製造方法中，在髮夾狀管的內周 面上一體地形成有沿著其長度方向上延伸、在圓周方向上 設有間隔的內散熱片。 在髮夾狀管上形成有內散熱片之熱交換器之製造方法中， 設置有在周方向上從髮夾狀管之內周面突出的不同高度之 2種高低之內散熱片，高的內散熱片之突出高度爲〇·7〜1.7 公厘，低的內散熱片之突出高度爲〇·4〜1.2公厘。 而且，髮夾狀管上形成內散熱片之熱交換器之製造方法 中，所有內散熱片之高度均爲相等，內散熱片從髮夾狀管 之內周面突出之高度爲0.7〜1.2公厘。 髮夾狀管上形成內散熱片之2個熱交換器之製造方法中， 內散熱片之節距爲〇·4〜1.6公厘。 再者，髮夾狀管上形成內散熱片之2個熱交換器之製造 方法中，髮夾狀管之外徑爲6〜10公厘，同一管之周壁肉 厚爲0 · 4〜0 · 8公厘。 -14- 1225144 五、發明說明（13) 趾圖之簡單說明 第1圖是顯示本發明之熱交換器用附有散熱片之管之一 部份被省略之平面圖， 第2圖是顯示第1圖之11 - 11線的放大剖面圖， 第3圖是顯示第1圖所示之熱交換器用附有散熱片之 管在擴管前的狀態之剖面圖， 第4圖是顯示第1圖所示之熱交換器用附有散熱片之管 的製造方法之圖，（a)是髮夾狀管在擴管前的狀態之局部 剖面圖，（b )是髮夾狀管在擴管前的狀態之局部剖面圖， 第5圖是顯示使用熱交換器用附有散熱片之管的熱交換 器之製造方法之局部立體圖， 第6圖是顯示本發明之熱交換器全體構成之立體圖， 第7圖是顯示相當於第2圖之熱交換器用附有散熱片之 管的另一具體例之剖面圖， 第8圖是顯示相當於第2圖之使用比較品1之熱交換器 用附有散熱片之管的剖面圖， 第9圖是顯示實驗例1之性能試驗之結果的曲線圖。 發明鮫佳實施例之詳細說明 下面將以本發明之實施例參照其附圖而說明。而下面之 說明中，「鋁」之用語爲除了純鋁之外含有鋁合金者之意 。而且下面之說明中，第1圖〜第4圖之左右做爲說明中 所指之左右。 第1圖及第2圖是顯示熱交換器用附有散熱片之管，第 -15- 1225144 五、發明說明（14) 3及4圖是顯示熱交換器用附有散熱片之管的製造方法， 第5圖是顯示使用熱交換器用附有散熱片之管的熱交換器 之製造方法，第6圖是顯示使用熱交換器用附有散熱片之 管製成的熱交換器全體構成。 第1圖及第2圖中，熱交換器用附有散熱片之管（1〇)係 由鋁製之髮夾狀管（11)，以及髮夾狀管（11)之直管部（11a) 的長度方向上設有節距之複數個散熱片群（13)所構成。髮 夾狀管（11)之兩直管部（11a)上相鄰之兩個散熱片群（13) 之間分別設置有無散熱片之部分（1 9 )。散熱片群（1 3 )是由 穿插在髮夾狀管（11)之兩直管部（11a)上而固定之複數個 平行板狀鋁製散熱片（12)所形成。 在髮夾狀管之內周面上，沿著其長度方向延伸且突出高 度不同之2種高低之內散熱片（30)(31)在周方向設有節距 而交互地形成一體。內散熱片（30 )( 3 1 )係朝向髮夾狀管 (11)的中心突出。高的內散熱片（30)從髮夾狀管之內周面 的突出高度（hi)爲爲0.7〜1.7公厘，低的內散熱片（31)從 髮夾狀管（11)之內周面的突出高度（h2)爲0.4〜1.2公厘。 而且，內散熱片（30) (31)之節距爲0.4〜1.6公厘。在此， 內散熱片（30 )( 3 1 )之節距係在橫剖面中，髮夾狀管（11 )的 中心線與相鄰之2個內散熱片（30 )( 3 1 )之厚度中心相連之 2條直線（L1 ) ( L2 )間之髮夾狀管（11 )之外周面上的圓周方 向之距離。並且，髮夾狀管（Π)之外徑爲6〜10公厘。且 其周壁得肉厚爲〇·4〜0.8公厘。 -16- 1225144 五、發明說明（15) 各板狀散熱片（12)上形成有2個插管用之貫通孔（12a)， 髮夾狀管（1 1 )之兩直管部（1 1 a )分別穿過所有板狀散熱片 (12)之2個插管用之貫通孔（12a).,兩直管部（11a)中形成 有散熱片群（.1 3 )之部分使用水、油、空氣等之流體而實施 擴管，而使板狀散熱片（1 2 )被固定在兩直管部（11 a )之周 圍。擴管部以（14)表示。而，髮夾狀管（11)之折曲部（lib) 全體被擴管，構成折曲部（lib)側端部之散熱片群（13)之 板狀散熱片（1 2 )與固定在直管部（11 a )上用之擴管部（1 4 ) 爲相同直徑。各擴管部（14)之長度比各散熱片群（13)之左 右兩端的板狀散熱片（1 2 )更位於左右方向之外方。 各個無散熱片部分（1 9)設置有預定長度之被拘束小徑部 (1 5 )。被拘束小徑部（1 5 )之左右兩端，介由朝向擴管部 (1 4 )側擴徑之推拔部（1 6 )而連到擴管部（14 )。而且，兩直 管部（11 a )之被拘束小徑部（1 5 )係在左右方向之相關同一 位置上。而，構成髮夾狀管（11 )之開口端側部（左端部）之 散熱片群（1 3 )的板狀散熱片（1 2 )被固定到直管部（1 1 a )用 之擴管部（1 4)之開口側部分亦被做爲被拘束小徑部（1 7), 此被拘束小徑部（1 7 )之右端藉由朝向擴管部（1 4 )側擴徑之 推拔部（1 8 )而連到擴管部（14 )。在此，被拘束小徑部（1 5 ) (1 7 )係分別在上述擴管時由未擴管之非擴管部所形成。而， 被拘束小徑部（1 5 )( 1 7 )除了非擴管部之外，亦可由板狀 散熱片（1 2 )之插管用之貫通孔（1 2 a )之內徑，即比擴管部 (1 4 )之外徑較小之小徑，成多少被擴管後之小徑擴管部所 -17- 1225144 五、發明說明（16) 形成。 熱交換器用附有散熱片之管（10)如第3圖及第4圖所示 地被製造出。 即，準備鋁製之髮夾狀管（11)，及形成2個插管用貫通 孔（12a)且以間隔配置之複數個板狀散熱片（12)，使髮夾 狀管（11)之兩直管部（11a)分別穿過所有板狀散熱片（12) 之2個插管用的貫通孔（12a)，而使複數個平行之板狀散 熱片（1 2 )形成之複數個散熱片群（1 3 )，以設有間隔而預先 被設置在直管部（11a)之長度方向上。其次，在髮夾狀管 (11 )之直管部（1 1 a )中，使相鄰之散熱片群之間的無散熱 片之部分（1 9 )，以拘束用模具（20 )進行拘束。拘束用模具 (20)是由2個模具（20a)(20b)所形成，具有與擴管前之髮 夾狀管（11 )之外徑相等之內徑的預定長度之圓筒形拘束部 (21 )，及設置在拘束部（21)兩端相連，且朝向左右方向外 方進行擴徑後之2個推拔部（22)，以及連結地設置於推拔 部（22 )之大端部上、且具有比板狀散熱片（1 2 )之插管用貫 通孔（12a)的內徑更大之內徑的短圓筒狀擴管許可部（23) 所形成之空間（24)(參照第4(a)圖）。 而且，髮夾狀管（11)之折曲部（lib)以第2之拘束用模 具（25)進行拘束。此拘束用模具（25)具有圓形橫剖面、且 爲U字狀之空間（26 )。空間（26 )之內徑比擴管前之髮夾狀 管（11)的外徑更大，且與第1拘束用模具（20)之擴管許可 部（23 )的內徑相等。再者，髮夾狀管（1 1 )的兩端部係利用 -18- 1225144 五、發明說明（17) 流體導入用治具（27)而拘束。流體導入用治具（27)具有與 擴管前之髮夾狀管（1 1 )之外徑相等之內徑的2個圓筒形拘 束部（2 8 )，及連到圓筒形拘束部（2 8 )之2個流體導入通路 (29)(參照第3圖）。有朝向右方擴徑之推拔部（28a)被設 置成與圓筒形拘束部（2 8 )之右)連接，並且有擴管I午可部 (28b)被設置成與推拔部（28a)之大端徑相連，且具有與第 1拘束用模具（20 )之擴管許可部（23 )相等的內徑之擴管許 可部（28b)。 其次，在此狀態下，在髮夾狀管（11 )之內，從流體導 入用治具（27)之流體導入通路（29)導入如水、油、空氣等 所之壓力流體，而將髮夾狀管（Π )中拘束用模具（2 0 )之拘 束部（21 )、及流體導入用治具（27)之拘束部（28)所拘束之 部份以外的部份進行擴管，因而使各散熱片群（1 3 )之板狀 散熱片（12)被固定到形成在髮夾狀管（11)之兩直管部（11a) 上之擴管部（1 4 )之周圍。而且，在此擴管時，形成被拘束 小徑部（15) (17)及推拔部（16)(18)(參照第4(b)圖）。因 而，製造出熱交換器用附有散熱片之管（10)。 依照此方法，由於使用上述之拘束用模具（20 )之故，在 壓力流體被導入髮夾狀管（11)內之時，可防止髮夾狀管（11) 之直管部（11a)上產生很大的撓曲。並且，在壓力流體被 導入髮夾狀管（11)內之時，更可防止在被拘束小徑部（1 5) 之周壁上產生折皺、及由於此折皺所引起直管部（11 a )在 長度方向上之變形。而且，由壓力流體擴管之故，因而可 -19- 1225144 五、發明說明（18) 防止內散熱片（30)(31)之漬倒。再者，可防止髮夾狀管 (1 1 )中無散熱片部分（1 9)之擴管所產生的破裂。 然後，如第5圖所示，將熱交換器用附有散熱片之管 (1 0 )在相鄰散熱片群（1 3 )之間的複數個被拘束小徑部（1 5 ) 上折曲，使全體被形成蛇行狀，如第6圖所示，因而可 製造出冰箱或展示櫃等之冷卻裝置之蒸發器所用的熱交換 器（1)。即，在兩直管部（11a)的長度方向相關之同一位置 上之2個無散熱片部分（1 9 )的被拘束小徑部（1 5 )上，將兩 個被拘束小徑部（1 5)在長度方向之中心所連結之直線向同 方向折曲而成爲曲率中心，並且兩直管部（11a)的長度方 向相鄰之無散熱片部分（19)的折曲方向不同，而使全體被 形成蛇行狀。 在此，將熱交換器用附有散熱片之管（10)在被拘束小徑 部（1 5 )上折曲，因此可使折曲加工作業容易進行。即，在 被拘束小徑部（1 5 )上並未在前工程中加工，因此不會產生 加工硬化，其結果可以容易進行折曲加工。 第6圖中，熱交換器（1)具有，被彎曲成蛇行狀之髮夾 狀管（11 )所形成的蛇行狀熱交換管（2 )，及蛇行狀熱交換 管（2 )之各直管部（2a )周圍所設置之複數個平行板狀散熱 片（12)所形成之散熱片群（13)。蛇行狀熱交換管（2)之左 右兩側的複數個折曲部（2b )分別由被拘束小徑部（1 5 )形成 。而，雖然圖中省略，但是蛇行狀熱交換管（2)之左右兩 側的複數個折曲部（2b )係分別由側板保持。 -20- 1225144 五、發明說明（19 ) 熱交換器（1)被使用在具有：具備壓縮機，凝結器及蒸 發器之冷凍循環，並使用碳氫系冷媒的冰箱之蒸發器中。 此冰箱中，其冷媒循環量爲1〜9公斤/小時。 熱交換器（1)係使用在具有：具有壓縮機，凝結器及蒸 發器之冷凍循環，並使用碳氫系冷媒的展示櫃之蒸發器中 。在此展示櫃中，其冷媒循環量爲1〜9公斤/小時。 第7圖爲顯示熱交換器用附有散熱片之管的變形例。 第7圖中，在髮夾狀管（11)之內周面上一體地形成有， 朝長度方向延伸、在周方向上設有節距、且突出之高度均 爲相等之複數個內散熱片（32)。內散熱片（32)從內周面突 出的高度（h3)爲0.7〜1.2公厘。而且，內散熱片（32)之節 距（P)爲0.4〜1.6公厘。在此，內散熱片（32)之節距（P)係 與上述者相同。而且，髮夾狀管（11)之外徑爲6〜10公厘 。且其周壁肉厚爲0.4〜0.8公厘。 其次，將顯示使用本發明之熱交換器及比較用熱交換器 之實驗例。 實驗例1 準備具有第2圖所示橫剖面形狀之髮夾狀管（1 1 )的熱交 換器（1)(本發明品1 )及具有第7圖所示橫剖面形狀之髮夾 狀管（11)的熱交換器（1 )(本發明品2 )。本發明品1之熱交 換器（1)的髮夾狀管（11)，其外徑爲8公厘，周壁肉厚爲 0.61公厘，高內散熱片（30)之突出高度（hl)爲爲丨.2公厘， 低內散熱片（31)之突出高度（h2)爲0.65公厘。兩內散熱 -21 - 1225144 五、發明說明（20) 片（30)(31 )之合計數爲30。本發明品2之熱交換器（1)的 髮夾狀管（11)，其外徑爲8公厘，周壁肉厚爲0.61公厘， 內散熱片（32)的突出高度（h3)爲1.2公厘，內散熱片（32) 的數目爲30。 而且，使用具有第8圖所示橫剖面形狀之髮夾狀管（40) 之外，亦準備和本發明品1有同樣構成之熱交換器（比較 品1)。在髮夾狀管（40)之內周面上一體地形成有，在其 長度方向延伸、在周方向上設有間隔、且突出高度均爲相 等之複數個內散熱片（41)。髮夾狀管（40)之外徑爲8公厘， 周壁肉厚爲0.61公厘，內散熱片（32)的數目爲30。而且， 比較品1爲上述之習知技術的第2方法所製造者，雖然擴 管前之內散熱片（41)之突出高度爲0.65公厘，但是由於 擴管心軸而使其前端多少潰倒。 然後，使用本發明品1，2及比較品1所製成的蒸發器， 使入口溫度爲-10— 22 °C、冷媒蒸發溫度爲-30 °C、過熱度 爲3 °C、冷媒的膨脹閥前壓力爲1 · 06MPa、冷媒循環量爲 2〜4公斤/時，對這些蒸發器進行調查。其結果顯示在第9 圖中。第9圖很淸楚地顯不，本發明品1及2在和比較品 1比較時其性能提高1 〇%程度。 實驗例2 使本發明品1及2及比較品1所製成的蒸發器被組裝到 冰箱中，將這些冰箱設置在溫度爲25°C '相對濕度爲70% 之環境中。然後，將門關閉而試驗測定壓縮機0N/0FF之 -22- 1225144 五、發明說明（21 ) 斷續運轉的消費電力。其結果，本發明品1所製成的蒸發 器被組裝之冰箱的消費電力量，比由比較品1所製成的蒸 發器組裝的冰箱之消費電力量降低2%，同樣地，本發明 品2所製成的蒸發器被組裝之冰箱的消費電力量，比由比較 品1所製成的蒸發器組裝的冰箱之消費電力量降低1 · 3%。 產業上之利用可能件 本發明之熱交換器用附有散熱片之管可被使用做爲製造 冰箱或展示櫃等之冷卻裝置的蒸發器用之熱交換器，尤其 是在製造使用碳氫系冷媒之冷卻裝置的蒸發器用之熱交換 器上很適合。 元件符號對照表 10 熱交換器用附有散熱片之管 11 髮夾狀管 13 散熱片群 19 無散熱片之部分 11a 直管部 12 板狀鋁製散熱片 30, 31 內散熱片 hi , h2 突出高度 LI , L2 直線 12a 插管用之貫通孔 lib 折曲部 14 擴管部 -23- 1225144 五、發明說明（22 ) 15 被拘束小徑部 16 推拔部 18 推拔部 20 拘束用模具 21 拘束部 20a, 20b 模具 22 推拔部 23 擴管許可部 24 空間 25 拘束用模具 26 空間 27 流體導入用治具 28 圓筒形拘束部 29 流體導入通路 28a 推拔部 28b 擴管許容部 2 蛇行狀熱交換管 2a 直管部 32 內散熱片 40 髮夾狀管 41 內散熱片 -24-1225144 V. Description of the invention (1) Field of the invention The present invention relates to a tube with a heat sink for a heat exchanger, which is a heat exchanger for manufacturing an evaporator of a cooling device such as a refrigerator or a display cabinet, and heat exchange. Manufacturing method of heat exchanger, tube with heat sink, and manufacturing method of heat exchanger. In the previous branch, the evaporator of a cooling device such as a refrigerator or a display cabinet is a heat exchanger, which is composed of a hairpin tube, a pitch is arranged in the length direction of the straight tube portion, and a hairpin is inserted. Tubes with fins for heat exchangers composed of a plurality of parallel plate-shaped fins fixed to two straight tube portions of the tube are used for heat exchangers, and are arranged at a plurality of positions where no fin group is provided. Bend so that the whole is formed into a serpentine shape. Conventionally, these heat exchangers are manufactured by the following two methods. The first method is described below. That is, first, two straight tubes, a plurality of plate-shaped fins which are formed at two pitches and formed with two through-holes, and a tube expanding tool having a tube expanding ball at one end of the line are prepared. Then, the two straight tubes are respectively passed through the two through holes of all the plate-shaped heat sinks, so that the heat sink group formed by the plurality of parallel plate-shaped heat sinks is spaced apart by a plurality of in the length direction of the tubes. Settings. Next, the wire of the pipe expansion tool passes through the pipe from the other end side, and the wire is expanded through the pipe by pulling the wire from the other end side to expand the pipe, thereby fixing the plate-shaped heat sink of the heat sink group to the pipe. Around. Next, one end of the two tubes is welded to both ends of the U elbow to form a tube with a heat sink for the heat exchanger connected by the U elbow between the two tubes. Thereafter, 1225144 V. Description of the invention (2) The plurality of ground points where the heat sink group is not provided on the tube with a heat sink for the heat exchanger is bent, so that the entire body is formed into a meandering shape. Therefore, a heat exchanger can be manufactured. '' However, in recent cooling devices such as refrigerators and display cabinets, the conventional fluorine-based refrigerants will be reviewed and replaced with hydrocarbon-based refrigerants that have little effect on ozone layer destruction or global warming. Because hydrocarbon-based refrigerants are flammable, Therefore, the leakage of the refrigerant must be suppressed as much as possible. However, the heat exchanger manufactured by the first method described above has the following problems. That is, the tube and the U elbow are welded, and the heat exchanger-attached tube for the heat exchanger has a seam, so this part will have Risk of refrigerant leakage. In addition, in order to increase the heat transfer area and increase the cooling efficiency, for example, in the case where a plurality of inner fins extending in the longitudinal direction of the tube are arranged in the circumferential direction at intervals on the inner surface of the tube in advance, When the height of the sheet is too high, the collapse rate caused by the ball during tube expansion will increase, so the flow resistance of the refrigerant will increase, and the cooling performance will decrease. Therefore, the height of the internal heat sink cannot be made too high, the effect of increasing the heat transfer area is reduced, and there is a limit to the improvement of the cooling efficiency. A second method of manufacturing a heat exchanger used in an evaporator of a cooling device such as a refrigerator or a display case will be described below. That is, first prepare a hairpin tube, and a plurality of plate-shaped heat sinks which form two through holes and are provided with a pitch, and prepare a tube expanding tool with a mandrel for tube expansion before the pressing rod. Then, the two straight tube portions of the hairpin-shaped tube are respectively passed through the two through holes of all the plate-shaped fins, so that a group of fins formed by a plurality of parallel plate-shaped fins is formed by a plurality of -4- 1225144 DESCRIPTION OF THE INVENTION The (3) tubes are arranged at intervals in the longitudinal direction of the tube. Next, the tube expansion mandrel of the tube expander is pushed in from the two ends of the hairpin-shaped tube, and the straight tube portion is expanded, so that the plate-shaped fins of the fin group are fixed around the tube. Thereafter, the tube was bent at a plurality of locations where the fin group was not provided on the tube for the heat exchanger, and the whole was meandered. In the heat exchanger manufactured by the above-mentioned second method, there is no seam on the hairpin-shaped tube of the heat-exchanger-equipped tube, so the heat exchanger manufactured by the first method is not produced. Refrigerant leaked. However, the heat exchanger manufactured by the second method has the following problems. That is, in order to increase the heat transfer area and increase the cooling efficiency, for example, when a plurality of inner fins extending in the longitudinal direction of the tube are arranged in the circumferential direction at intervals on the inner surface of the tube in advance, When the height of the inner fins is too high, the collapse ratio of the inner fins caused by the mandrel when expanding the pipe will become larger, so that the flow resistance of the refrigerant will be increased, and the cooling performance will be reduced. Therefore, the height of the inner fin cannot be made too high, and the effect of increasing the heat transfer area is reduced, so there is a limit to the improvement of the cooling efficiency. Therefore, in order to prevent the inner fin from collapsing, in the second method described above, it is considered to expand the tube by introducing a pressure fluid into the two straight pipe portions in the hairpin shape. However, in this case, on the part where the fin group is not provided, the peripheral wall of the tube may be folded, and the tube may be deformed in the length direction. The length of the tube with the fins for the heat exchanger may be changed. A heat exchanger of the required size cannot be obtained. In addition, although bending is performed at a plurality of locations where a fin group is not provided on a tube for a heat exchanger, 1225144 V. Description of the Invention (4) However, when wrinkles are generated here, bending is performed. It may cause the heat sink in the tube to collapse. Moreover, in the state before the tube expansion, the portion where the fin group is not provided on the straight tube portion of the hairpin-shaped tube and the portion where the fin group is provided are not restricted, so the pressure fluid is introduced for expansion. At the time of pipe control, the entire length of the straight pipe part may cause problems caused by large deflection. Furthermore, the portion of the hairpin-shaped tube that is not provided with a fin group may be cracked when the tube is expanded. The object of the present invention is to provide a heat exchanger which can solve the above problems, not only can suppress the leakage of refrigerant, but also obtain the required cooling performance. Brief description of the invention The tube with fins for the heat exchanger of the present invention is: a plurality of fin groups and spaces formed by a plurality of parallel plate-shaped fins fixed across two straight tube portions of a hairpin-shaped tube It is arranged in the length direction of the straight tube portion, and is characterized in that two plate-shaped heat sinks are formed with spaced through holes for intubation, and two straight tube portions of the hairpin tube pass through the intubation tube respectively. Through-holes, and the hairpin-shaped tube is expanded with a fluid, and the plate-shaped heat sink is fixed around the pipe-expanded portion of the hairpin-shaped tube, and the two straight heat-sinks of the hairpin-shaped tube are adjacent to each other. Between the groups, portions without fins are respectively provided, and at least one of all portions without fins on each straight pipe portion is provided with a constrained small diameter portion having a smaller diameter and a predetermined length than the expanded portion. The heat exchanger-equipped tube for the heat exchanger of the present invention has a hairpin-like tube, and there is no seam, so the refrigerant in the heat exchanger using the heat sink-equipped tube for the heat exchanger can be suppressed. Give way. Therefore, a hydrocarbon-based refrigerant having little effect on ozone layer destruction or global warming can be used. Furthermore, 1225144 V. Description of the invention (5) The plate-shaped heat sink is fixed around the straight tube portion of the hairpin tube by the expansion of the fluid, so the heat transfer area is formed on the inner peripheral surface of the hairpin tube. For the purpose of enlargement, even when the inner fins with a high protruding height are formed, the inner fins will not collapse when the tube is expanded, so that the required cooling performance (heat exchange performance) can be obtained. In addition, at least one of all the non-radiating fin portions on each straight pipe portion of the hairpin tube is provided with a constrained small diameter portion having a smaller diameter and a predetermined length than the pipe expansion portion, and the pipe is expanded with a fluid. At this time, the restrained small-diameter portion can be restrained. In the state before the tube expansion, the length of the unrestrained portion of the straight tube portion of the hairpin-shaped tube becomes relatively short. Therefore, it is possible to prevent a large deflection in the straight pipe portion when the pipe is expanded. In the heat exchanger-equipped tube of the present invention, all the straight tube portions of the hairpin-shaped tube are provided with restricted small-diameter portions on all straight tube portions of the hairpin-shaped tube. In the case of Vlit, when the tube is expanded with a fluid, the restrained small-diameter portion can be restrained. Therefore, in the state before the expansion, the length of the restrained portion in the straight tube portion of the hairpin tube becomes relatively long. Therefore, it is possible to prevent a large deflection in the straight pipe portion when the pipe is expanded. In the finned tube for a heat exchanger of the present invention, both ends of the restrained small-diameter portion are connected to the expanded portion by a push-pull portion that expands toward the expanded portion side. In this case, both ends of the constrained small-diameter portion are connected to the pipe-expanding portion by push-pull portions that expand the diameter toward the pipe-expanding portion side. Therefore, when the hairpin-shaped pipe is expanded, All the plate-shaped heat sinks are securely fixed around the pipe expansion section 1225144 V. Invention description (6). In the heat exchanger-equipped tube of the present invention, the restricted small-diameter portion is a non-expanded portion. In this case, in order to manufacture the heat exchanger, the tube with a heat sink with a heat sink is bent at the non-expanded portion when it is bent. The non-expanded part is not subjected to pre-engineering, so no work hardening occurs, and as a result, bending can be easily performed. In the heat exchanger-equipped tube of the present invention, the inner peripheral surface of the hairpin-shaped tube has inner fins extending along the longitudinal direction of the hairpin-shaped tube, and is integrally formed with spaces in the circumferential direction. In this case, the heat exchange performance of the heat exchanger manufactured by using the tube with a heat sink can be improved. In the heat exchanger-equipped tube for forming a heat exchanger having an inner fin, two types of inner fins of different heights and heights protruding from the inner peripheral surface of the hairpin-shaped tube are provided in the circumferential direction. The protruding height is 〇7 ~ 1, 7,7 mm, and the protruding height of the low inner fin is 0. 4 ~ 1. 2 mm. In this case, the heat exchanger manufactured by using the tube with a heat sink has excellent heat exchange performance. In the tubes with fins for heat exchangers forming inner fins, the height of all the inner fins is equal, and the height of the inner fins protruding from the inner peripheral surface of the hairpin-shaped tube is 0. 7 ~ 1. 2 mm. In this case, the heat exchanger manufactured by using the tube with a heat sink has an excellent effect of improving heat exchange performance. -8- 1225144 V. Description of the invention (7) In a tube with a fin attached to a heat exchanger forming an inner fin, the pitch of the inner fin is 0. 4 ~ 1. 6 mm. Moreover, the heat exchanger with an internal fin is formed with a fin. In the tube, the outer diameter of the hairpin tube is 6 to 10 mm, and the thickness of the peripheral wall of the same tube is 0. 4 ~ 0. 8 mm. The heat exchanger of the present invention, such as the tube with fins used in the heat exchanger of the first patent application range, has two fins at the same position in the length direction of the straight tube portion of the hairpin-shaped tube. The part is bent in the same direction, and at the same time, the bending direction of the part without the heat sink adjacent to the length direction of the straight pipe part of the hairpin-shaped tube is different, so that the whole is formed into a meandering shape. According to the heat exchanger of the present invention, the same effects as those described in the heat exchanger-use tube with a heat sink can be achieved. In the heat exchanger of the present invention, a restricted small-diameter portion is provided on each straight tube portion of each straight tube portion of a hairpin-shaped tube with a finned tube for a heat exchanger, and heat exchange is performed. The tube with a heat sink for the device is bent on the restrained small diameter portion of all the parts without the heat sink. In this case, when the pipe is expanded with a fluid, the restrained small-diameter portion can be restrained without being expanded, or only a few are expanded, so that the processing amount of the part is 0 or very small, so The work hardening ratio becomes small. Therefore, the bending process can be easily performed. In the heat exchanger of the present invention, internal fins extending along the longitudinal direction of the heat exchanger-equipped tube with a fin are formed integrally on the inner peripheral surface of the tube, and spaced in the circumferential direction. In this case, the heat exchanger 1225144 V. Description of the invention (8) Heat exchange performance can be improved. An inner heat sink is formed on the hairpin-shaped tube of the heat exchanger-attached tube. In the heat exchanger, two types of inner fins of different heights protruding from the inner peripheral surface of the hairpin-shaped tube are provided in the circumferential direction, and the protruding height of the high inner fin is 0. 7 ~ 1. 7 mm, the protruding height of the low inner fin is 0 · 4 ~ 1 · 2 mm. In this case, the heat exchange performance of the heat exchanger can be made more excellent. In the heat exchanger in which the inner fins are formed on a hairpin-shaped tube with a finned tube for a heat exchanger, the heights of all the inner fins are equal, and the inner fins extend from the inner peripheral surface of the hairpin-shaped tube. The protruding height is 0. 7 ~ 1. 2 mm. In this case, the heat exchange performance of the heat exchanger can be made more excellent. In the heat exchanger, a tube with a fin with a hairpin-shaped tube is formed with two inner heat radiating fins, and the inner fins have a pitch of 0. 4 ~ 1. 6 mm. Furthermore, in the two heat exchangers in which the inner fins are formed on the hairpin-shaped tube of the heat exchanger-equipped tube, the outer diameter of the hairpin-shaped tube is 6 to 10 mm. The meat thickness is 0. 4 ~ 0. 8 mm. A refrigerator according to the present invention includes a refrigeration cycle provided with a compressor, a condenser, and an evaporator. The evaporator is formed by a heat exchanger such as any one of claims 10 to 18 in the scope of patent application to use carbon. As a refrigerant, a hydrogen-based refrigerant has a refrigerant circulation volume of 1 to 9 kg / hour. A display cabinet of the present invention includes a refrigerating cycle provided with a compressor, a condenser, and an evaporator. The evaporator is formed by a heat exchanger according to any one of claims 10 to 18 in the scope of patent application to use carbon. Hydrogen-based refrigerant is used as the refrigerant, -10- 1225144 V. Description of the invention (9) The refrigerant circulation volume is 1 to 9 kg / hour. The method for manufacturing a tube with fins for a heat exchanger according to the present invention is characterized in that: preparing a hairpin-shaped tube, and forming a plurality of plate-shaped fins arranged at a pitch through two through holes for insertion, The two straight tubes of the hairpin tube pass through the through-holes for intubation of all the plate-shaped fins respectively, so that the two straight tubes pass through the two through-holes of all the plate-shaped fins respectively, so that a plurality of parallel The fin group formed by the plate-shaped fins is arranged at a plurality of intervals in the length direction of the tube, and at the same time, a portion without a fin is provided between two adjacent fin groups in advance. At least one of all the non-radiating fin portions of each straight pipe portion is performed by a restraint mold having a small-diameter cylindrical restraint portion having a smaller diameter than the inner diameter of the through-hole for intubation of the plate-like fin. Restricted, in this state, the fluid is introduced into the two straight pipe portions of the hairpin tube to expand the tube, and the plate-shaped fins of each fin group are fixed around the straight pipe portion of the hairpin tube. According to the method for manufacturing a finned tube for a heat exchanger according to the present invention, a finned tube for a heat exchanger having the above-mentioned effects can be manufactured relatively easily. In addition, at least one of all the non-radiating fin portions of each straight pipe portion of the hairpin tube is a small-diameter cylindrical shape having a smaller diameter than the inner diameter of the through-hole for insertion of the plate-shaped fin. The restraint of the restraint portion is restrained by a mold, and in this state, the fluid is introduced into the hairpin tube to expand the tube, so that the straight tube portion of the hairpin tube can be prevented from being greatly deflected during the expansion. In the manufacturing method of the finned tube for a heat exchanger of the present invention, all the parts without fins on each straight tube portion of the hairpin-shaped tube are restricted by a restraining mold-11-1225144 V. Description of the invention (1〇 ) Restricted in advance. In this case, it is possible to reliably prevent a large deflection from occurring in the straight pipe portion of the hairpin-like pipe when the pipe is expanded. Also, it prevents hairpins. The part in which the heat sink group does not exist is broken during the expansion. In the method for manufacturing a tube with a fin for a heat exchanger according to the present invention, the restraint mold has a cylindrical restraint portion of a predetermined length, and is provided to be connected to both ends of the restraint portion and faces the longitudinal direction. Formed by two push-out portions for expanding the diameter on the outside, and a pipe-expanding permission portion provided to be connected to the large end portion of the push-out portion and having an inner diameter larger than the inner diameter of the through-hole of the plate-shaped heat sink space. In the method for manufacturing a finned tube for a heat exchanger according to the present invention, the restraint portion has an inner diameter equal to the outer diameter of the hairpin-shaped tube before the tube expansion. In this case, the restricted small-diameter portion existing on the non-radiating fin portion of the tube with fins for the heat exchanger after manufacture is a non-expanding portion. When the tube of the sheet is bent, it is bent on the non-expanded portion. Since the non-expanded portion was not processed in the previous process, no work hardening occurs, and as a result, bending can be easily performed. In the method for manufacturing a finned tube for a heat exchanger according to the present invention, an internal heat sink is formed integrally on the inner peripheral surface of the hairpin tube, which extends along the length direction and is spaced in the circumferential direction. sheet. In this case, when a pressure fluid is introduced to expand the tube, the plate-shaped fins of each fin group can be fixed around the straight tube portion of the hairpin tube, so that the fins in the tube can be prevented from collapsing during expansion. Therefore, the heat exchange performance of a heat exchanger manufactured by using a tube with a fin with a heat exchanger is excellent. -12- 1225144 V. Description of the invention (11) In the manufacturing method of a tube with a heat sink for a heat exchanger having an internal fin on a hairpin tube, the inner periphery of the hairpin tube is provided in the circumferential direction. There are two kinds of inner fins with different heights protruding from the surface, and the height of the inner fins with a high protrusion is 0. 7 ~ 1. 7 mm, the protruding height of the low inner fin is 0. 4 ~ 1. 2 mm. Moreover, in the manufacturing method of a tube with a heat sink for a heat exchanger in which an inner fin is formed on a hairpin tube, all the inner fins have the same height, and the inner fins protrude from the inner peripheral surface of the hairpin tube The height is 0.7 ~ 1. 2 mm. In the manufacturing method of the two heat exchanger-equipped tubes with inner fins formed on the hairpin-shaped tube, the pitch of the inner fins is 0.4 to 1. 6 mm. Furthermore, in a method for manufacturing a tube with fins for two heat exchangers in which inner fins are formed on the hairpin tube, the outer diameter of the hairpin tube is 6 to 10 mm, and the peripheral wall meat of the same tube Thickness is 0. 4 ~ 0. 8 mm. In the manufacturing method of the heat exchanger of the present invention, it is characterized in that the length of the straight tube portion of the hairpin-shaped tube for the heat exchanger manufactured by the method of the scope of patent application No. 21 The two non-radiating fins at the same position in the same direction are bent in the same direction, and at the same time, the bending direction of the non-radiating fins adjacent to the length direction of the straight portion of the hairpin tube is different, so that the entire Formed serpentine. According to the method for manufacturing a heat exchanger according to the present invention, the same effects as described in the use of a tube with a heat sink in the heat exchanger can be achieved. In the manufacturing method of the heat exchanger of the present invention, a tube with a heat sink for a heat exchanger manufactured by the method of claim 22 of the scope of patent application is used. -13-1225144 V. Description of the invention (12) This heat The heat exchanger-equipped tube for the exchanger is bent in advance on the restrained part where the restraint part of the restraint mold is used to restrain the part without the heat sink in advance. In this case, when the heat exchanger-equipped tube is bent, the bent portion is bent. At the time of expansion, all the restrained parts were not expanded, or only a few were expanded, so that the processing volume of the part was 0 or very small, so the work hardening ratio became small. Therefore, the bending process can be easily performed. In the method for manufacturing a heat exchanger according to the present invention, internal fins extending along the lengthwise direction of the hairpin-shaped tube and having intervals in the circumferential direction are integrally formed on the inner peripheral surface of the hairpin-shaped tube. In a method for manufacturing a heat exchanger having an inner fin on a hairpin tube, two types of inner and lower fins of different heights protruding from the inner peripheral surface of the hairpin tube in the circumferential direction are provided. The protruding height of the inner heat sink is 0.7 ~ 1. 7 mm, the protruding height of the low inner fin is 0.4 ~ 1. 2 mm. Moreover, in the manufacturing method of the heat exchanger in which the inner fins are formed on the hairpin tube, the heights of all the inner fins are equal, and the height of the inner fins protruding from the inner peripheral surface of the hairpin tube is 0. 7 ~ 1. 2 mm. In the manufacturing method of the two heat exchangers forming the inner fins on the hairpin-shaped tube, the pitch of the inner fins is 0.4 · 1. 6 mm. Furthermore, in the manufacturing method of the two heat exchangers with inner fins formed on the hairpin tube, the outer diameter of the hairpin tube is 6 to 10 mm, and the thickness of the peripheral wall of the same tube is 0. 4 to 0. 8 mm. -14- 1225144 V. Description of the invention (13) Simple explanation of toe figure. Figure 1 is a plan view showing a part of the tube with a heat sink for a heat exchanger of the present invention is omitted, and Figure 2 is a view showing Figure 1. An enlarged cross-sectional view taken along line 11-11, FIG. 3 is a cross-sectional view showing a state before the expansion of the tube with a heat sink for the heat exchanger shown in FIG. 1, and FIG. 4 is a view showing the first view. (A) is a partial cross-sectional view of the state of the hairpin-shaped tube before the tube expansion, and (b) is a view of the state of the hairpin-shaped tube before the tube expansion Partial cross-sectional view, FIG. 5 is a partial perspective view showing a manufacturing method of a heat exchanger using a tube with fins for a heat exchanger, and FIG. 6 is a perspective view showing the overall structure of the heat exchanger of the present invention. Fig. 8 is a cross-sectional view showing another specific example of a heat exchanger-equipped tube corresponding to the heat exchanger shown in Fig. 2. Fig. 8 is a diagram showing a heat-equipped tube corresponding to the heat exchanger of Fig. 2 using the comparative product 1. Fig. 9 is a graph showing the results of the performance test of Experimental Example 1 . DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT OF THE INVENTION Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, the term "aluminum" means those containing aluminum alloys in addition to pure aluminum. In the following description, the left and right sides of Figures 1 to 4 are referred to as the left and right directions in the description. Figures 1 and 2 show the tubes with heat sinks for heat exchangers. Figure -15-1225144 V. Description of the invention (14) Figures 3 and 4 show the manufacturing methods of the tubes with heat sinks for heat exchangers. Fig. 5 shows a manufacturing method of a heat exchanger using a heat exchanger-equipped tube, and Fig. 6 shows an overall structure of a heat exchanger made using a heat exchanger-equipped tube. In Figs. 1 and 2, the tube (10) with fins for the heat exchanger is a hairpin tube (11) made of aluminum, and a straight tube portion (11a) of the hairpin tube (11). A plurality of fin groups (13) with a pitch are arranged in the length direction of the fin. Between the two straight tube portions (11a) of the hairpin-shaped tube (11), two fin groups (13) adjacent to each other are respectively provided with fin-free portions (19). The heat sink group (1 3) is formed by a plurality of parallel plate-shaped aluminum heat sinks (12) that are inserted and fixed on two straight pipe portions (11a) of the hairpin pipe (11). On the inner peripheral surface of the hairpin-shaped tube, two types of inner and lower fins (30) (31) extending along the length direction and protruding at different heights are provided with a pitch in the circumferential direction to form an integrated body alternately. The inner fins (30) (3 1) project toward the center of the hairpin tube (11). The protruding height (hi) of the high inner fin (30) from the inner peripheral surface of the hairpin tube is 0. 7 ~ 1. 7 mm, the projecting height (h2) of the low inner fin (31) from the inner peripheral surface of the hairpin tube (11) is 0. 4 ~ 1. 2 mm. Moreover, the pitch of the inner fins (30) (31) is 0. 4 ~ 1. 6 mm. Here, the pitch of the inner fins (30) (31) is in the cross section, the thickness of the center line of the hairpin tube (11) and the thickness of two adjacent inner fins (30) (31) The distance in the circumferential direction on the outer peripheral surface of the hairpin tube (11) between the two straight lines (L1) (L2) connected at the center. The outer diameter of the hairpin tube (Π) is 6 to 10 mm. And the thickness of its peripheral wall is 0.4 ~ 0. 8 mm. -16- 1225144 V. Description of the invention (15) Each plate-shaped heat sink (12) is formed with two through-holes (12a) for intubation, and two straight tube portions (1 1) of hairpin-shaped tube (1 1) a) Pass through the two through-holes (12a) for intubation of all plate-shaped heat sinks (12), respectively. A heat sink group is formed in the two straight pipe sections (11a) (. Parts of 13) are expanded using fluids such as water, oil, air, etc., so that the plate-shaped fins (12) are fixed around the two straight pipe sections (11a). The tube expansion part is indicated by (14). In addition, the entire bent portion (lib) of the hairpin-shaped tube (11) is expanded to form a plate-shaped heat sink (1 2) constituting a heat sink group (13) at the side of the bent portion (lib) and fixed to The pipe expanding part (1 4) used for the straight pipe part (11a) has the same diameter. The length of each of the tube expansion sections (14) is more than the left and right plate-shaped fins (12) of each fin group (13). Each of the fin-free portions (19) is provided with a restrained small-diameter portion (1 5) of a predetermined length. The left and right ends of the restrained small-diameter part (1 5) are connected to the pipe-expanding part (14) through a push-out part (1 6) that expands the diameter toward the pipe-expanding part (1 4) side. In addition, the restrained small-diameter portion (1 5) of the two straight pipe portions (11 a) is located at the same position in the left and right directions. In addition, the plate-shaped fins (1 2) constituting the fin group (1 3) of the open end side (left end) of the hairpin-shaped tube (11) are fixed to the straight tube portion (1 1 a) for expansion. The open side part of the pipe part (1 4) is also regarded as the restrained small-diameter part (1 7), and the right end of the restrained small-diameter part (1 7) is expanded toward the pipe expansion part (1 4). The pushing part (1 8) is connected to the pipe expanding part (14). Here, the restrained small-diameter portions (1 5) (17) are formed by the non-expanded non-expanded portions at the time of the above-mentioned expansion. In addition, the restricted small-diameter portion (1 5) (17) may be the inner diameter of the through-hole (1 2 a) for intubation of the plate-shaped heat sink (1 2) in addition to the non-expanded portion, that is, The small diameter smaller than the outer diameter of the pipe expansion section (1 4) is formed by the small diameter pipe expansion section after expansion. -17-1225144 5. Description of the invention (16) is formed. A heat exchanger-equipped tube (10) is manufactured as shown in Figs. 3 and 4. That is, a hairpin tube (11) made of aluminum is prepared, and a plurality of plate-shaped heat sinks (12) are formed to form two through-holes (12a) for intubation and are arranged at intervals. The two straight pipe portions (11a) pass through the two through-holes (12a) for intubation of all the plate-shaped heat sinks (12) respectively, so that a plurality of parallel plate-shaped heat sinks (1 2) form a plurality of heat sinks. The sheet group (1 3) is provided in advance in the longitudinal direction of the straight pipe portion (11a) with an interval. Next, in the straight tube portion (11a) of the hairpin-shaped tube (11), the portion (19) without the fins between the adjacent fin groups is restrained by a restraint mold (20). . The restraint mold (20) is a cylindrical restraint portion (20) having a predetermined length and an inner diameter equal to the outer diameter of the hairpin tube (11) before the tube expansion, which is formed by two molds (20a) (20b). 21), and two push-out portions (22) connected to both ends of the restraint portion (21) and expanding outward in the left-right direction, and the large end portions connected to the push-out portion (22) The space (24) formed by the upper short cylindrical expansion permitting portion (23) having an inner diameter larger than the inner diameter of the through-hole (12a) for intubation of the plate-shaped heat sink (12) (See Figure 4 (a)). The bent portion (lib) of the hairpin tube (11) is restrained by the second restraint mold (25). This restraint mold (25) has a circular cross section and a U-shaped space (26). The inner diameter of the space (26) is larger than the outer diameter of the hairpin tube (11) before the tube expansion, and is equal to the internal diameter of the tube expansion permitting portion (23) of the first restraint mold (20). Furthermore, both ends of the hairpin tube (1 1) are restricted by using -18-1225144 V. Description of the invention (17) The fluid introduction jig (27). The fluid introduction jig (27) has two cylindrical restraints (2 8) having an inner diameter equal to the outer diameter of the hairpin tube (1 1) before the tube expansion, and is connected to the cylindrical restraint (2 8) The two fluid introduction paths (29) (see FIG. 3). A pusher (28a) with a diameter expanding to the right is provided to connect to the cylindrical restraint (2 8) (right), and a pipe expansion section (28b) is provided to the pusher ( 28a) is connected with a large end diameter, and has an inner diameter equal to that of the first expansion mold permitting portion (23) of the tube expansion permitting portion (23). Next, in this state, a pressure fluid such as water, oil, or air is introduced from the fluid introduction path (29) of the fluid introduction jig (27) within the hairpin tube (11), and the hairpin is The restricting part (21) of the restraining mold (20) in the tube (Π) and the restricting part (28) of the fluid introduction jig (27) are expanded, so that the pipe is expanded. The plate-shaped fins (12) of each fin group (1 3) are fixed to the periphery of the tube-expanding portion (1 4) formed on the two straight tube portions (11a) of the hairpin-shaped tube (11). In this expansion, the restricted small-diameter portions (15) (17) and push-out portions (16) (18) are formed (see Fig. 4 (b)). Therefore, a tube (10) with a fin for a heat exchanger is manufactured. According to this method, since the restraint mold (20) is used, when the pressure fluid is introduced into the hairpin tube (11), the straight tube portion (11a) of the hairpin tube (11) can be prevented. Produces great deflection. In addition, when the pressure fluid is introduced into the hairpin tube (11), it is possible to prevent wrinkles on the peripheral wall of the restrained small-diameter portion (15) and the straight tube portion (11 a) caused by the wrinkles. Deformation in the length direction. Moreover, because of the expansion of the pressure fluid tube, it can be -19-1225144 V. Description of the invention (18) Prevents the inner heat sink (30) (31) from falling down. Furthermore, it is possible to prevent cracks caused by the expansion of the hairpin-shaped tube (1 1) without the fin portion (19). Then, as shown in FIG. 5, the heat exchanger-attached tube (1 0) for the heat exchanger is bent on the plurality of restricted small-diameter portions (1 5) between the adjacent fin groups (1 3). As shown in Fig. 6, the heat exchanger (1) for the evaporator of a cooling device such as a refrigerator or a display case can be manufactured. That is, two restrained small-diameter portions (1 5) on two restrained small-diameter portions (1 5) of the two non-radiating fin portions (1 9) at the same position related to the length direction of the two straight pipe portions (11 a) ( 1 5) The straight line connected at the center of the length direction is bent in the same direction to become the center of curvature, and the bending directions of the non-radiating fin portions (19) adjacent to each other in the length direction of the two straight tube portions (11a) are different, and Make the whole body meandering. Here, since the tube (10) with a fin for a heat exchanger is bent on the restrained small diameter portion (15), the bending work can be easily performed. That is, the restrained small-diameter portion (1 5) is not processed in the previous process, and therefore, work hardening does not occur, and as a result, bending processing can be easily performed. In Fig. 6, the heat exchanger (1) has a meandering heat exchange tube (2) formed by a meandering hairpin pipe (11) and each meandering heat exchange tube (2). A fin group (13) formed by a plurality of parallel plate-shaped fins (12) arranged around the tube portion (2a). A plurality of bent portions (2b) on the left and right sides of the meandering heat exchange tube (2) are respectively formed by the restrained small diameter portion (1 5). Although omitted in the figure, the plurality of bent portions (2b) on the left and right sides of the meandering heat exchange tube (2) are held by the side plates, respectively. -20- 1225144 V. Description of the invention (19) The heat exchanger (1) is used in an evaporator of a refrigerator having a refrigeration cycle including a compressor, a condenser, and an evaporator, and a hydrocarbon-based refrigerant. In this refrigerator, the amount of refrigerant circulation is 1 to 9 kg / hour. The heat exchanger (1) is used in an evaporator having a refrigerating cycle with a compressor, a condenser, and an evaporator, and a display cabinet using a hydrocarbon refrigerant. In this display case, the refrigerant circulation volume is 1 to 9 kg / hour. Fig. 7 shows a modified example of a heat exchanger-equipped tube for a heat exchanger. In FIG. 7, a plurality of inner fins are integrally formed on the inner peripheral surface of the hairpin tube (11), extending in the longitudinal direction, provided with a pitch in the circumferential direction, and protruding at equal heights. (32). The height (h3) of the inner fin (32) protruding from the inner peripheral surface is 0. 7 ~ 1. 2 mm. Moreover, the pitch (P) of the inner heat sink (32) is 0. 4 ~ 1. 6 mm. Here, the pitch (P) of the inner fins (32) is the same as the above. The outer diameter of the hairpin tube (11) is 6 to 10 mm. And its wall thickness is 0. 4 ~ 0. 8 mm. Next, experimental examples using the heat exchanger of the present invention and a comparative heat exchanger will be shown. Experimental Example 1 A heat exchanger (1) (product 1 of the present invention) having a hairpin tube (1 1) having a cross-sectional shape shown in FIG. 2 and a hairpin tube having a cross-sectional shape shown in FIG. 7 were prepared. (11) The heat exchanger (1) (product 2 of the present invention). The hairpin tube (11) of the heat exchanger (1) of the product 1 of the present invention has an outer diameter of 8 mm and a peripheral wall thickness of 0. 61 mm, the protruding height (hl) of the high internal heat sink (30) is 丨. 2 mm, the protruding height (h2) of the low inner fin (31) is 0. 65 mm. Two internal cooling -21-1225144 V. Description of the invention (20) The total number of pieces (30) (31) is 30. The hairpin tube (11) of the heat exchanger (1) of the present invention 2 has an outer diameter of 8 mm and a thickness of peripheral wall of 0. 61 mm, the protruding height (h3) of the inner fin (32) is 1. 2 mm, the number of inner fins (32) is 30. Furthermore, a heat exchanger having the same structure as that of the product 1 of the present invention (Comparative product 1) was prepared except that a hairpin tube (40) having a cross-sectional shape shown in Fig. 8 was used. A plurality of inner fins (41) are integrally formed on the inner peripheral surface of the hairpin-shaped tube (40), extending in the longitudinal direction, spaced in the circumferential direction, and having a protruding height of equal. The outer diameter of the hairpin tube (40) is 8 mm, and the thickness of the peripheral wall is 0. 61 mm, the number of inner fins (32) is 30. Moreover, the comparative product 1 is manufactured by the second method of the above-mentioned conventional technique, although the protruding height of the heat sink (41) before the expansion is 0. 65 mm, but the front end collapsed somewhat due to the expansion mandrel. Then, using the evaporators made of the products 1, 2 and the comparative product 1, the inlet temperature is -10-22 ° C, the refrigerant evaporation temperature is -30 ° C, the superheat degree is 3 ° C, and the refrigerant is expanded. The pressure in front of the valve was 1.006 MPa, and the refrigerant circulation volume was 2 to 4 kg / hr. These evaporators were investigated. The results are shown in Figure 9. FIG. 9 clearly shows that the performance of the products 1 and 2 of the present invention is improved by about 10% when compared with the comparative product 1. Experimental Example 2 The evaporators made of the present invention products 1 and 2 and the comparative product 1 were assembled in refrigerators, and these refrigerators were set in an environment having a temperature of 25 ° C and a relative humidity of 70%. Then, the door is closed to test and measure the -22-1225144 of the compressor 0N / 0FF. 5. Description of the invention (21) Consumption power for intermittent operation. As a result, the power consumption of the refrigerator assembled with the evaporator made of the product 1 of the present invention was 2% lower than that of the refrigerator assembled with the evaporator made of the comparative product 1. Similarly, the product of the present invention The power consumption of the refrigerator assembled with the evaporator manufactured by 2 is 1 · 3% lower than the power consumption of the refrigerator assembled with the evaporator manufactured by comparative product 1. Industrial application possibility The heat exchanger-equipped tube of the heat exchanger of the present invention can be used as a heat exchanger for an evaporator for manufacturing a cooling device such as a refrigerator or a display case, especially for manufacturing a hydrocarbon-based refrigerant. The evaporator of the cooling device is suitable for a heat exchanger. Component symbol comparison table 10 Tube with heat sink for heat exchanger 11 Hairpin tube 13 Heat sink group 19 Section without heat sink 11a Straight pipe part 12 Plate-shaped aluminum heat sink 30, 31 Inner heat sink hi, h2 protrudes Height LI, L2 Straight line 12a Through-hole for intubation lib Bending part 14 Expansion part -23- 1225144 V. Description of the invention (22) 15 Restricted small diameter part 16 Pushing part 18 Pushing part 20 Restraint mold 21 Restraint section 20a, 20b Mould 22 Push section 23 Tube expansion permission section 24 Space 25 Restraint mold 26 Space 27 Fluid introduction jig 28 Cylindrical restraint section 29 Fluid introduction path 28a Push section 28b Tube expansion allowance section 2 Snake Heat exchange tube 2a straight tube portion 32 inner fin 40 hairpin tube 41 inner fin -24-