JP3983358B2 - Cylindrical heat exchanger - Google Patents

Cylindrical heat exchanger Download PDF

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Publication number
JP3983358B2
JP3983358B2 JP32913297A JP32913297A JP3983358B2 JP 3983358 B2 JP3983358 B2 JP 3983358B2 JP 32913297 A JP32913297 A JP 32913297A JP 32913297 A JP32913297 A JP 32913297A JP 3983358 B2 JP3983358 B2 JP 3983358B2
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inner cylinder
cylinder
outer cylinder
heat exchanger
medium
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JPH11159926A (en
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慎哉 坂野
二郎 山本
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Hoshizaki Electric Co Ltd
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Hoshizaki Electric Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
    • Y02P60/80—Food processing, e.g. use of renewable energies or variable speed drives in handling, conveying or stacking
    • Y02P60/85—Food storage or conservation, e.g. cooling or drying

Description

【０００１】
【発明の属する技術分野】
本発明は、例えばオーガ式製氷機の冷凍系に使用し得る円筒型熱交換器に関する。
【０００２】
【従来の技術】
円筒型熱交換器は例えば特開昭５５−２５７３５号公報に示されていて、この公報に示されている円筒型熱交換器は、内面及び外面が平滑な内筒と、所定範囲の内面に螺旋状の溝を有し且つ該溝の一端部と他端部には媒体の入口と出口を形成した外筒とを備え、前記溝の開口を前記内筒の外面で塞ぎ、且つ該溝以外の前記外筒の平坦部と前記内筒の外面との間に間隙を存する様に内筒と外筒を配置して前記内筒の外面と前記外筒の平坦部とをブレージング加工により結合し前記内筒の外面と前記溝によって媒体流通路を形成して成るものである。
【０００３】
【発明が解決しようとする課題】
上記した公報の円筒型熱交換器においては、媒体流通路が螺旋状に形成されているため、媒体流通路を流れる媒体が遠心力によって主として媒体流通路の外側、すなわち外筒の螺旋状内面に沿って流れることとなり、媒体と外筒間での熱交換が十分に得られるものの、媒体と内筒間での熱交換が十分に得られなくて、媒体流通路内の媒体と内筒の内部に存在する物質間での熱交換を効率よく行うことができない。
【０００４】
本発明は、上記の問題に対処するため、平滑な内周面と外周面を有する円筒状の内筒と、周方向に変位した部位にてその一部分を大径部とした複数のリング状小径部を軸方向にて等間隔に離間して形成した円筒蛇腹形状の外筒によって構成され、前記外筒を前記内筒に嵌合した状態にて同外筒の前記複数のリング状小径部が前記内筒の外周面に圧入固定され前記内筒と外筒がその嵌合部分にて炉中ろう付けによって一体にされることにより前記内筒の外周面に前記リング状小径部の間に多段の環状通路が形成されこれらの環状通路が前記リング状小径部の大径部分にて連通して冷却媒体の流通路が形成された円筒型熱交換器を提供するものである。
【０００５】
本発明の実施にあたっては、前記外筒の両端に円筒状の小径部を形成して、これら小径部を前記内筒の外周面に嵌合した部分にて前記内筒と外筒を炉中ろう付けにより一体にするのが望ましい。この場合、前記外筒の一端部に冷却媒体の流入口を設け、同外筒の他端部に前記冷却媒体の流出口を設けて、前記流入口と流出口に冷凍配管を接続することにより冷却媒体を流通させるのが望ましい。
【０００６】
【発明の作用・効果】
上記のように構成した本発明による円筒型熱交換器においては、前記外筒を前記内筒に嵌合した状態にて同外筒の前記複数のリング状小径部が前記内筒の外周面に圧入固定され前記内筒と外筒がその嵌合部分にて炉中ろう付けによって一体にされることにより前記内筒の外周面に前記リング状小径部の間に多段の環状通路が形成されこれらの環状通路が前記リング状小径部の大径部分にて連通して冷却媒体の流通路が形成される。しかして、多段に形成された環状通路に供給される冷却媒体は、各環状通路内を螺旋状通路に比して通路の外周に偏りが少ない状態にて流れ、内筒の外周面に沿っても十分に流れる。このため、媒体流通路内の媒体と内筒間での熱交換が十分に得られて、媒体流通路内の媒体と内筒の内部に存在する物質間での熱交換を効率よく行うことができる。
【０００８】
また、本発明による円筒型熱交換器は、上記の外筒を内筒に圧入嵌合してその嵌合部分にて炉中ろう付けするだけで簡単に製造できるため、作業者によるハンダ付けやガス溶接に比して、製品の品質を安定させることができるとともに、作業環境を改善することができる。
【０００９】
【発明の実施の形態】
以下に、本発明の一実施形態を図面に基づいて説明する。図１及び図２は本発明による円筒型熱交換器をオーガ式製氷機の冷凍系に使用した例を示していて、この円筒型熱交換器１０は、内面１１ａ及び外面１１ｂが平滑な内筒１１と、上下両端部に筒状小径部１２ａ，１２ｂを有するとともに中間部に一部分を欠いたリング状小径部１２ｃを複数個（１１個）有する外筒１２を備えている。なお、図１に示したオーガ式製氷機は円筒型熱交換器１０以外の構成（例えば、オーガ２１、上部ハウジング２２、軸受２３、下部ハウジング２４、メカニカルシール２５、連結スリーブ２６、ギヤドモータ２７及び氷放出管２８等）が周知のものである。
【００１０】
内筒１１は、熱伝達が良好で耐水性の素材、例えばステンレス鋼管にて円筒形状に形成されていて、上下両端段部１１ｃ，１１ｄには環状フランジ１３，１４が圧入固定された状態で炉内ろう付けされる（炉内ろう付けされる部位の内筒外面１１ａにはろう材が予め塗布されている）ことにより一体的に組付けられている。また、内筒１１の下部所定位置に設けたパイプ取付孔１１ｅには、内筒１１内に製氷水を給排するための給排水パイプ１５が圧入固定された状態で炉内ろう付けされる（炉内ろう付けされる部位の内筒外面１１ａにはろう材が予め塗布されている）ことにより一体的に組付けられている。なお、給排水パイプ１５には、製氷水タンク（図示省略）内の製氷水を内筒１１内に導くための給水パイプ（図示省略）と、内筒１１内の水を排水路（図示省略）に導くための排水パイプ（図示省略）が接続されるようになっている。
【００１１】
外筒１２は、薄肉金属管にて円筒蛇腹形状に形成されていて、上端部一側には媒体入口１２ｄが形成され、下端部一側には媒体出口１２ｅが形成されている。媒体入口１２ｄはハンダ付けまたはガス溶接あるいは炉内ろう付けされる入口パイプ１６と冷凍配管（図示省略）を介して冷凍系の膨張弁（図示省略）に接続され、また媒体出口１２ｅはハンダ付けまたはガス溶接あるいは炉内ろう付けされる出口パイプ１７と冷凍配管（図示省略）を介して冷凍系の圧縮機（図示省略）に接続されるようになっている。また、外筒１２の上端には、上方の環状フランジ１３の下面に密着する環状フランジ部１２ｆが形成されている。また、外筒１２の上下両端には折り曲げ加工部１２ｇ，１２ｈが形成されている。
【００１２】
ところで、本実施形態においては、内筒１１の外面１１ｂと外筒１２の筒状小径部１２ａ，１２ｂ及び多数のリング状小径部１２ｃが圧入固定され、また外筒１２の環状フランジ部１２ｆが環状フランジ１３の下面に密着した状態で、内筒１１と外筒１２が炉内ろう付けされる（このときに内筒１１に圧入固定されている両環状フランジ１３，１４及び給排水パイプ１５も同時に内筒１１に炉内ろう付けされる）ことにより、内筒１１と外筒１２が密着結合されて一体化されていて、これによって内筒１１と外筒１２間に媒体流通路Ｐが形成されている。
【００１３】
媒体流通路Ｐは、多段の環状通路Ｐ１と、これら環状通路Ｐ１で隣接する各環状通路Ｐ１を周方向に変位した部位にて連通させる連通路Ｐ２（リング状小径部１２ｃの一部を大径にした部分、すなわち小径としない部分によって形成されている）からなるもので、一端は外筒１２に設けた媒体入口１２ｄに連通し、また他端は外筒１２に設けた媒体出口１２ｅに連通している。また、媒体流通路Ｐを構成する各連通路Ｐ２が各段毎で対向位置（図示左端位置と図示右端位置）に交互に設けられていて、媒体流通路Ｐがジクザク形状とされている。
【００１４】
上記のように構成した本実施形態の円筒型熱交換器１０においては、内筒１１と外筒１２が内筒１１の外面１１ａと外筒１２の筒状小径部１２ａ，１２ｂ及び多数のリング状小径部１２ｃにて密着結合されることにより、内筒１１と外筒１２間に多段の環状通路Ｐ１とこれら環状通路Ｐ１で隣接する各環状通路Ｐ１を周方向に変位した部位にて連通させる連通路Ｐ２からなる媒体流通路Ｐが形成される。このため、媒体入口１２ｄから媒体流通路Ｐに入った媒体（冷媒）は環状通路Ｐ１と連通路Ｐ２を順次通って媒体出口１２ｅに至り、その間に或る段の環状通路Ｐ１を一方に流れた媒体が次段の環状通路Ｐ１を他方に流れて、媒体流通路Ｐを媒体がジクザクに流れる。
【００１５】
したがって、媒体流通路Ｐ内の媒体は、各環状通路Ｐ１内を螺旋状通路に比して通路の外周に偏りが少ない状態、すなわち媒体の多くが自重で各段の底面に沿って流れ、一部が内筒１１の外面１１ｂに沿って流れ、外筒１２の内面に沿って殆ど流れない状態（実験により確認されている）にて流れ、内筒１１の外面１１ｂに沿っても十分に流れる。このため、媒体流通路Ｐ内の媒体と内筒１１間での熱交換が十分に得られて、媒体流通路Ｐ内の媒体と内筒１１の内部に存在する製氷水間での熱交換を効率よく行うことができる。
【００１６】
また、本実施形態の円筒型熱交換器１０においては、媒体流通路Ｐを構成する各連通路Ｐ２が各段毎で対向位置に交互に設けられているため、媒体入口１２ｄから媒体出口１２ｅに至る媒体流通路Ｐの実質的な全長を長くすることができて、媒体の媒体流通路Ｐ内での滞留時間を十分に確保でき、これによっても熱交換効率を高めることができる。また、内筒１１と外筒１２の密着結合手段として圧入固定手段及び炉内ろう付け固定手段を採用しているため、作業者によるハンダ付けやガス溶接に比して、製品の品質を安定させることができるとともに、作業環境を改善することができる。
【００１７】
また、本実施形態の円筒型熱交換器１０においては、内筒１１と外筒１２が炉内ろう付けされるときに内筒１１に圧入固定されている両環状フランジ１３，１４及び給排水パイプ１５も同時に内筒１１に炉内ろう付けされるようにしたため、両環状フランジ１３，１４及び給排水パイプ１５を内筒１１にハンダ付けやガス溶接によって固着する場合のような内筒１１の局部加熱による歪みの発生を無くすことができて、最終工程での内筒１１の内面１１ａの寸法出し加工を不要とすることができる。
【００１８】
また、本実施形態の円筒型熱交換器１０においては、外筒１２の上下両端に折り曲げ加工部１２ｇ，１２ｈが形成されているため、各折り曲げ加工部１２ｇ，１２ｈを所要の大きさとしてろう材の保持部とすることも可能であり、各折り曲げ加工部１２ｇ，１２ｈにろう材を置いて炉内ろう付けを行えば、内筒１１の外面１１ｂと外筒１２の筒状小径部１２ａ，１２ｂとの密着結合を更に確実とすることが可能である。
【００１９】
上記実施形態においては、外筒１２の上下に単一の媒体入口１２ｄ及び媒体出口１２ｅを設けるとともに、中間部に一部分を欠いたリング状小径部１２ｃを複数個（１１個）設けて、内筒１１と外筒１２間に多段の環状通路Ｐ１とこれら環状通路Ｐ１で隣接する各環状通路Ｐ１を周方向に変位した部位にて連通させる連通路Ｐ２からなる媒体流通路Ｐ（隣接する環状通路Ｐ１を単一の連通路Ｐ２によって連通させた通路）が形成されるようにしたが、外筒１２の上下に対向する一対の媒体入口及び媒体出口をそれぞれ設けるとともに、中間部に対向する二箇所を欠いたリング状小径部を複数個（１１個）設けて、内筒１１と外筒１２間に多段の環状通路とこれら環状通路で隣接する各環状通路を周方向に変位した部位にて連通させる連通路からなる媒体流通路（隣接する環状通路を対向する一対の連通路によって連通させた通路）が形成されるようにして実施することも可能である。また、上記実施形態においては、外筒１２の上方に媒体入口１２ｄを設けるとともに外筒１２の下方に媒体出口１２ｅを設けて実施したが、外筒の上方に媒体出口を設けるとともに外筒の下方に媒体入口を設けて実施することも可能である。
【００２０】
また、上記実施形態においては、炉内ろう付けに先だって内筒１１の外面１１ｂに予めろう材を塗布して実施したが、これに代えて或いはこれに加えて外筒１２の内面に予めろう材を塗布して実施することも可能である。また、外筒１２のリング状小径部１２ｃでは外筒１２の筒状小径部１２ａ，１２ｂほどに内筒１１と外筒１２の密着結合が要求されないため、外筒１２のリング状小径部１２ｃでは圧入固定のみによる密着結合でも実施可能である。この場合には、内筒１１の外面１１ｂや外筒１２の内面に予めろう材を塗布しないで、各折り曲げ加工部１２ｇ，１２ｈにろう材を置いて炉内ろう付けを行うのが望ましい。
【００２１】
また、上記実施形態においては、本発明による円筒型熱交換器をオーガ式製氷機の冷凍系に実施した例について説明したが、本発明による円筒型熱交換器はソフトクリーム製造機、冷凍炭酸飲料製造機等他の機械にも同様に実施し得るものである。
【図面の簡単な説明】
【図１】 本発明による円筒型熱交換器をオーガ式製氷機の冷凍系に使用した例を示す一部破断側面図である。
【図２】 図１に示した円筒型熱交換器の一部破断側面図である。
【符号の説明】
１０…円筒型熱交換器、１１…内筒、１１ａ…内面、１１ｂ…外面、１２…外筒、１２ａ，１２ｂ…筒状小径部、１２ｃ…リング状小径部、１２ｄ…媒体入口、１２ｅ…媒体出口、１２ｆ…環状フランジ部、１２ｇ，１２ｈ…折り曲げ部、１３，１４…環状フランジ、１５…給排水パイプ、Ｐ…媒体流通路、Ｐ１…環状通路、Ｐ２…連通路。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cylindrical heat exchanger that can be used, for example, in a refrigeration system of an auger type ice making machine.
[0002]
[Prior art]
A cylindrical heat exchanger is disclosed in, for example, Japanese Patent Application Laid-Open No. 55-25735. A cylindrical heat exchanger disclosed in this publication has an inner tube with a smooth inner surface and outer surface, and an inner surface within a predetermined range. An outer cylinder having a spiral groove and having a medium inlet and outlet formed at one end and the other end of the groove, the opening of the groove being blocked by the outer surface of the inner cylinder, and other than the groove The inner cylinder and the outer cylinder are arranged so that there is a gap between the flat part of the outer cylinder and the outer surface of the inner cylinder, and the outer surface of the inner cylinder and the flat part of the outer cylinder are joined by brazing. A medium flow path is formed by the outer surface of the inner cylinder and the groove.
[0003]
[Problems to be solved by the invention]
In the cylindrical heat exchanger of the above publication, the medium flow passage is formed in a spiral shape, so that the medium flowing through the medium flow passage is mainly formed on the outside of the medium flow passage, that is, on the spiral inner surface of the outer cylinder by centrifugal force. Although the heat exchange between the medium and the outer cylinder is sufficiently obtained, the heat exchange between the medium and the inner cylinder is not obtained sufficiently, and the medium in the medium flow path and the inside of the inner cylinder are obtained. It is not possible to efficiently exchange heat between substances existing in
[0004]
In order to address the above problems , the present invention provides a cylindrical inner cylinder having a smooth inner peripheral surface and an outer peripheral surface, and a plurality of ring-shaped small diameters having a large diameter portion at a portion displaced in the circumferential direction. A plurality of ring-shaped small-diameter portions of the outer cylinder in a state in which the outer cylinder is fitted to the inner cylinder. The inner cylinder and the outer cylinder are press-fitted and fixed to the outer peripheral surface of the inner cylinder, and the inner cylinder and the outer cylinder are integrated with each other by brazing in the furnace at a fitting portion thereof, so that a multi-stage is provided between the ring-shaped small diameter portions on the outer peripheral surface of the inner cylinder The annular heat exchanger is formed, and these annular passages communicate with each other at the large diameter portion of the ring-shaped small diameter portion to provide a cylindrical heat exchanger in which a flow passage for the cooling medium is formed .
[0005]
In carrying out the present invention, cylindrical small-diameter portions are formed at both ends of the outer tube, and the inner tube and the outer tube are brazed in a furnace at a portion where these small-diameter portions are fitted to the outer peripheral surface of the inner tube. It is desirable to unite by attaching. In this case, by providing an inlet for the cooling medium at one end of the outer cylinder, an outlet for the cooling medium at the other end of the outer cylinder, and connecting a refrigeration pipe to the inlet and the outlet. It is desirable to distribute the cooling medium.
[0006]
[Operation and effect of the invention]
In the cylindrical heat exchanger according to the present invention configured as described above, the plurality of ring-shaped small diameter portions of the outer cylinder are formed on the outer peripheral surface of the inner cylinder in a state where the outer cylinder is fitted to the inner cylinder. When the inner cylinder and the outer cylinder are press-fitted and fixed together by brazing in the furnace at the fitting portion, a multistage annular passage is formed between the ring-shaped small diameter portions on the outer peripheral surface of the inner cylinder. The annular passage communicates with the large-diameter portion of the ring-shaped small-diameter portion to form a cooling medium flow passage. Thus, the cooling medium supplied to the annular passages formed in multiple stages flows in each annular passage in a state where the deviation is less on the outer periphery of the passage than the spiral passage, and along the outer peripheral surface of the inner cylinder. Well flowing. For this reason, sufficient heat exchange between the medium in the medium flow path and the inner cylinder can be obtained, and heat exchange between the medium in the medium flow path and the substance existing in the inner cylinder can be efficiently performed. it can.
[0008]
Further, the cylindrical heat exchanger according to the present invention can be easily manufactured by simply press-fitting the outer cylinder into the inner cylinder and brazing in the fitting portion at the fitting portion. Compared with gas welding, the product quality can be stabilized and the working environment can be improved.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 and 2 show an example in which a cylindrical heat exchanger according to the present invention is used in a refrigerating system of an auger type ice making machine. This cylindrical heat exchanger 10 has an inner cylinder having a smooth inner surface 11a and outer surface 11b. 11 and an outer cylinder 12 having a plurality of (11) ring-shaped small-diameter portions 12c having cylindrical small-diameter portions 12a and 12b at both upper and lower ends and a portion lacking in the middle portion. The auger type ice making machine shown in FIG. 1 has a configuration other than the cylindrical heat exchanger 10 (for example, auger 21, upper housing 22, bearing 23, lower housing 24, mechanical seal 25, connecting sleeve 26, geared motor 27, and ice). The discharge tube 28 and the like are well known.
[0010]
The inner cylinder 11 is formed in a cylindrical shape with a heat-resistant and water-resistant material, for example, a stainless steel pipe, and the annular flanges 13 and 14 are press-fitted and fixed to the upper and lower end step portions 11c and 11d. It is assembled integrally by being internally brazed (a brazing material is applied in advance to the inner cylinder outer surface 11a of the part to be brazed in the furnace). Also, the pipe mounting hole 11e provided at a predetermined position below the inner cylinder 11 is brazed in the furnace in a state where a water supply / drainage pipe 15 for supplying and discharging ice making water into the inner cylinder 11 is press-fitted and fixed (furnace The brazing material is preliminarily applied to the outer surface 11a of the inner cylinder of the part to be brazed internally. The water supply / drainage pipe 15 includes a water supply pipe (not shown) for guiding ice making water in an ice making water tank (not shown) into the inner cylinder 11, and water in the inner cylinder 11 into a drainage path (not shown). A drainage pipe (not shown) for guiding is connected.
[0011]
The outer cylinder 12 is formed of a thin metal tube in a cylindrical bellows shape. A medium inlet 12d is formed on one side of the upper end and a medium outlet 12e is formed on the lower end. The medium inlet 12d is connected to an expansion valve (not shown) of the refrigeration system via an inlet pipe 16 and a refrigeration pipe (not shown) that are soldered, gas welded or brazed in the furnace, and the medium outlet 12e is soldered or It is connected to a refrigeration system compressor (not shown) through an outlet pipe 17 and a refrigeration pipe (not shown) that are gas-welded or brazed in the furnace. Further, an annular flange portion 12 f that is in close contact with the lower surface of the upper annular flange 13 is formed at the upper end of the outer cylinder 12. Further, bent portions 12g and 12h are formed on the upper and lower ends of the outer cylinder 12, respectively.
[0012]
By the way, in this embodiment, the outer surface 11b of the inner cylinder 11, the cylindrical small-diameter portions 12a and 12b of the outer cylinder 12, and a large number of ring-shaped small-diameter portions 12c are press-fitted and the annular flange portion 12f of the outer cylinder 12 is annular. The inner cylinder 11 and the outer cylinder 12 are brazed in the furnace in close contact with the lower surface of the flange 13 (both the annular flanges 13 and 14 and the water supply / drainage pipe 15 that are press-fitted and fixed to the inner cylinder 11 at this time are also included in the inner cylinder 11). The inner cylinder 11 and the outer cylinder 12 are tightly coupled and integrated with each other by the brazing of the cylinder 11 to the furnace, thereby forming a medium flow path P between the inner cylinder 11 and the outer cylinder 12. Yes.
[0013]
The medium flow passage P is a communication passage P2 ( a part of the ring-shaped small-diameter portion 12c having a large diameter) that connects the multi-stage annular passages P1 and the annular passages P1 adjacent to each other at the circumferentially displaced portions. made of portions, that is, formed by a portion which is not a small diameter) to one end communicates with the medium inlet 12d provided in the outer tube 12, the other end is communicated with the media outlet 12e provided in the outer tube 12 is doing. Further, the communication paths P2 constituting the medium flow path P are alternately provided at opposing positions (left end position in the drawing and right end position in the drawing) for each stage, and the medium flow passage P has a zigzag shape.
[0014]
In the cylindrical heat exchanger 10 of the present embodiment configured as described above, the inner cylinder 11 and the outer cylinder 12 include the outer surface 11a of the inner cylinder 11, the cylindrical small diameter portions 12a and 12b of the outer cylinder 12, and a large number of ring shapes. By being tightly coupled at the small-diameter portion 12c, the multi-stage annular passage P1 between the inner cylinder 11 and the outer cylinder 12 and each annular passage P1 adjacent to the annular passage P1 are communicated at a portion displaced in the circumferential direction. A medium flow path P composed of the path P2 is formed. For this reason, the medium (refrigerant) that has entered the medium flow path P from the medium inlet 12d sequentially passes through the annular path P1 and the communication path P2 to the medium outlet 12e, and flows through one stage of the annular path P1 between them. The medium flows through the annular passage P1 at the next stage to the other, and the medium flows in a zigzag manner through the medium flow path P.
[0015]
Accordingly, the medium in the medium flow passage P is less biased on the outer periphery of the passage in each annular passage P1 than the spiral passage, that is, most of the medium flows under its own weight along the bottom surface of each stage. Part flows along the outer surface 11 b of the inner cylinder 11, flows in a state where it hardly flows along the inner surface of the outer cylinder 12 (confirmed by experiments), and flows sufficiently along the outer surface 11 b of the inner cylinder 11. . For this reason, sufficient heat exchange between the medium in the medium flow path P and the inner cylinder 11 is obtained, and heat exchange between the medium in the medium flow path P and the ice making water existing inside the inner cylinder 11 is achieved. It can be done efficiently.
[0016]
Further, in the cylindrical heat exchanger 10 of the present embodiment, the communication paths P2 constituting the medium flow path P are alternately provided at opposite positions in each stage, and therefore, from the medium inlet 12d to the medium outlet 12e. The substantial total length of the reaching medium flow path P can be lengthened, and the residence time of the medium in the medium flow path P can be sufficiently secured, thereby improving the heat exchange efficiency. Moreover, since the press-fitting fixing means and the in-furnace brazing fixing means are adopted as the tight coupling means of the inner cylinder 11 and the outer cylinder 12, the product quality is stabilized as compared with soldering and gas welding by the operator. Work environment can be improved.
[0017]
In the cylindrical heat exchanger 10 of the present embodiment, both the annular flanges 13 and 14 and the water supply / drainage pipe 15 that are press-fitted and fixed to the inner cylinder 11 when the inner cylinder 11 and the outer cylinder 12 are brazed in the furnace. At the same time, since the inner cylinder 11 is brazed into the furnace, both the annular flanges 13 and 14 and the water supply / drainage pipe 15 are locally heated by the inner cylinder 11 as in the case of being fixed to the inner cylinder 11 by soldering or gas welding. Generation of distortion can be eliminated, and dimensioning of the inner surface 11a of the inner cylinder 11 in the final process can be made unnecessary.
[0018]
Further, in the cylindrical heat exchanger 10 of the present embodiment, the bent portions 12g and 12h are formed at the upper and lower ends of the outer cylinder 12, so that the brazed materials have the required sizes of the bent portions 12g and 12h. If the brazing material is placed on the bent portions 12g and 12h and brazing is performed in the furnace, the outer surface 11b of the inner cylinder 11 and the cylindrical small diameter portions 12a and 12b of the outer cylinder 12 are used. It is possible to further ensure the tight coupling with.
[0019]
In the above embodiment, a single medium inlet 12d and a medium outlet 12e are provided above and below the outer cylinder 12, and a plurality of (11) ring-shaped small-diameter portions 12c lacking a part in the intermediate portion are provided. 11 and the outer cylinder 12, a medium flow passage P (adjacent annular passage P1) comprising a multi-stage annular passage P1 and a communication passage P2 that communicates the annular passages P1 adjacent to each other in the circumferential direction with the annular passages P1. Is formed by a single communication path P2, but a pair of medium inlets and medium outlets facing the upper and lower sides of the outer cylinder 12 are provided, and two positions facing the intermediate part are provided. A plurality (11) of ring-shaped small-diameter portions lacking are provided, and the multistage annular passages between the inner cylinder 11 and the outer cylinder 12 and the annular passages adjacent to each other in the annular passages are communicated with each other at a location displaced in the circumferential direction. Is it a communication passage It is also possible to become medium passage (passages communicated by a pair of communication passages facing the adjacent annular passage) is carried out so as to be formed. In the above embodiment, the medium inlet 12d is provided above the outer cylinder 12 and the medium outlet 12e is provided below the outer cylinder 12. However, the medium outlet is provided above the outer cylinder 12 and the lower side of the outer cylinder. It is also possible to carry out by providing a medium inlet.
[0020]
In the above embodiment, the brazing material is previously applied to the outer surface 11b of the inner cylinder 11 prior to the brazing in the furnace, but instead of or in addition to this, the brazing material is previously applied to the inner surface of the outer cylinder 12. It is also possible to apply and apply. Further, in the ring-shaped small-diameter portion 12c of the outer cylinder 12, the ring-shaped small-diameter portion 12c of the outer cylinder 12 does not require the tight coupling between the inner cylinder 11 and the outer cylinder 12 as much as the cylindrical small-diameter portions 12a and 12b of the outer cylinder 12. It can also be implemented by tight coupling only by press-fitting. In this case, it is desirable to perform brazing in the furnace by placing a brazing material in each of the bent portions 12g and 12h without previously applying a brazing material to the outer surface 11b of the inner cylinder 11 and the inner surface of the outer cylinder 12.
[0021]
In the above embodiment, the example in which the cylindrical heat exchanger according to the present invention is implemented in the refrigeration system of the auger type ice making machine has been described. However, the cylindrical heat exchanger according to the present invention is a soft ice cream manufacturing machine, a frozen carbonated beverage. It can be similarly applied to other machines such as a manufacturing machine.
[Brief description of the drawings]
FIG. 1 is a partially broken side view showing an example in which a cylindrical heat exchanger according to the present invention is used in a refrigerating system of an auger type ice making machine.
FIG. 2 is a partially broken side view of the cylindrical heat exchanger shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Cylindrical heat exchanger, 11 ... Inner cylinder, 11a ... Inner surface, 11b ... Outer surface, 12 ... Outer cylinder, 12a, 12b ... Cylindrical small diameter part, 12c ... Ring-shaped small diameter part, 12d ... Medium inlet, 12e ... Medium Outlet, 12f ... annular flange, 12g, 12h ... bent part, 13, 14 ... annular flange, 15 ... water supply / drainage pipe, P ... medium flow passage, P1 ... annular passage, P2 ... communication passage.

Claims (3)

平滑な内周面と外周面を有する円筒状の内筒と、周方向に変位した部位にてその一部分を大径部とした複数のリング状小径部を軸方向にて等間隔に離間して形成した円筒蛇腹形状の外筒によって構成され、前記外筒を前記内筒に嵌合した状態にて同外筒の前記複数のリング状小径部が前記内筒の外周面に圧入固定され前記内筒と外筒がその嵌合部分にて炉中ろう付けによって一体にされることにより前記内筒の外周面に前記リング状小径部の間に多段の環状通路が形成されこれらの環状通路が前記リング状小径部の大径部分にて連通して冷却媒体の流通路が形成された円筒型熱交換器。 A cylindrical inner cylinder having a smooth inner peripheral surface and an outer peripheral surface, and a plurality of ring-shaped small-diameter portions having a large-diameter portion at a portion displaced in the circumferential direction are spaced apart at equal intervals in the axial direction. The outer ring is formed by a cylindrical bellows-shaped outer cylinder, and the plurality of ring-shaped small diameter portions of the outer cylinder are press-fitted and fixed to the outer peripheral surface of the inner cylinder in a state where the outer cylinder is fitted to the inner cylinder. The tube and the outer tube are integrated at the fitting portion by brazing in the furnace, so that a multistage annular passage is formed between the ring-shaped small diameter portions on the outer peripheral surface of the inner tube, and these annular passages are A cylindrical heat exchanger in which a cooling medium flow passage is formed in communication with a large diameter portion of a ring-shaped small diameter portion . 前記外筒の両端に円筒状の小径部を形成して、これら小径部を前記内筒の外周面に嵌合した部分にて前記内筒と外筒を炉中ろう付けしたことを特徴とする請求項１に記載の円筒型熱交換器。 A cylindrical small diameter portion is formed at both ends of the outer cylinder, and the inner cylinder and the outer cylinder are brazed in a furnace at a portion where the small diameter portion is fitted to the outer peripheral surface of the inner cylinder. The cylindrical heat exchanger according to claim 1. 前記外筒の一端部に冷却媒体の流入口を設け、同外筒の他端部に前記冷却媒体の流出口を設けたことを特徴とする請求項２に記載の円筒型熱交換器。The cylindrical heat exchanger according to claim 2 , wherein an inlet of a cooling medium is provided at one end of the outer cylinder, and an outlet of the cooling medium is provided at the other end of the outer cylinder .
JP32913297A 1997-11-28 1997-11-28 Cylindrical heat exchanger Expired - Fee Related JP3983358B2 (en)

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JP32913297A JP3983358B2 (en) 1997-11-28 1997-11-28 Cylindrical heat exchanger

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CZ300488B6 (en) * 2003-07-04 2009-06-03 Heat exchanger system
US20100116823A1 (en) * 2008-11-07 2010-05-13 Applied Materials, Inc. Hydroformed fluid channels

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