JPH05138256A - Refrigerator for refrigeration bending of tube - Google Patents
Refrigerator for refrigeration bending of tubeInfo
- Publication number
- JPH05138256A JPH05138256A JP33577491A JP33577491A JPH05138256A JP H05138256 A JPH05138256 A JP H05138256A JP 33577491 A JP33577491 A JP 33577491A JP 33577491 A JP33577491 A JP 33577491A JP H05138256 A JPH05138256 A JP H05138256A
- Authority
- JP
- Japan
- Prior art keywords
- tubes
- shelf
- liquid nitrogen
- bending
- pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】通常の曲げ加工方法では曲げにく
い中空二重管やステンレス鋼管は、管の中に水を詰めて
凍らせた状態でベンダーに掛けて曲げるいわゆる冷凍曲
げ加工が行われる。本発明はこの冷凍曲げ加工を行うに
当たって管の中に充填した水を凍らせるための凍結装置
に関するものである。[Field of Industrial Application] Hollow double pipes and stainless steel pipes that are difficult to bend by a normal bending method are subjected to so-called freezing bending in which the pipes are filled with water and frozen to be bent by a bender. The present invention relates to a freezing device for freezing water filled in a pipe in performing the freezing bending process.
【０００２】[0002]
【従来の技術】従来のこの種の凍結装置は、断熱槽の中
に、一端に栓をして水を詰めた管を栓側を下にして入
れ、その槽内に液体窒素を直接噴霧して管の中の水を凍
らせることによって、曲げ加工に必要な氷の硬度を得て
いる。2. Description of the Related Art In a conventional freezing device of this type, a pipe having a plug at one end and filled with water is put into a heat insulating tank with the plug side facing down, and liquid nitrogen is directly sprayed into the tank. By freezing the water in the tube, the hardness of the ice required for bending is obtained.
【０００３】[0003]
【発明が解決しようとする課題】ところが、従来の凍結
装置は上記のように、液体窒素を被加工管が置かれてい
る箇所に直接噴霧するため管に液体窒素が直に触れる。
したがって、その極低温によって管に低温ぜい性を生
じ、曲げ加工できないことがあった。また、管内の水は
管に直接触れている外側の部分から凍るため、中心部が
凍るときの膨張によって氷のひび割れ、管の肥大変形、
栓の外れ等が起きて加工不能になる場合があった。However, in the conventional freezing device, as described above, the liquid nitrogen is directly sprayed onto the place where the pipe to be processed is placed, so that the liquid nitrogen directly contacts the pipe.
Therefore, the cryogenic temperature may cause a low temperature brittleness in the tube, which may prevent bending. In addition, the water in the pipe freezes from the outer part that is in direct contact with the pipe, so the expansion of the center freezes the ice cracks, and the pipe expands and deforms.
There was a case where the plug could come off and it could not be processed.
【０００４】本発明は上記の問題点に鑑みて提案された
もので、槽内に噴射された液体窒素が管に直接触れない
ようにし、気化した窒素ガスを対流させて管内の水の凍
結膨張に方向付けすることを目的とする。The present invention has been proposed in view of the above problems, in which liquid nitrogen injected into the tank is prevented from directly contacting the pipe, and vaporized nitrogen gas is convected to freeze-expand water in the pipe. The purpose is to orient.
【０００５】[0005]
【課題を解決するための手段】本発明の凍結装置は上記
の目的を達成するために、断熱槽内に、一端に栓をして
水を詰めた管を栓側を下にして立てる透かし棚を設け、
その透かし棚の下方に液体窒素を噴出するノズルを配置
するとともに断熱槽の上部に排気口を設け、透かし棚の
上に立てた管の間を窒素ガスが下から上に向かって流れ
るように構成したものである。In order to achieve the above-mentioned object, the freezing device of the present invention is a watermark shelf in which a pipe having a plug at one end and filled with water is set up with the plug side facing down in the heat insulation tank. Is provided
A nozzle for ejecting liquid nitrogen is placed below the watermark shelf, and an exhaust port is provided at the top of the heat insulation tank so that nitrogen gas flows from bottom to top between the pipes standing on the watermark shelf. It was done.
【０００６】[0006]
【作用】液体窒素が透かし棚より下に噴射され、気化し
た低温の窒素ガスは、透かし棚の上に立っている水が入
った管の周りを上昇する。このように低温の窒素ガスの
流れを槽内の下から上へと方向付けることによって、槽
内の温度が、下の方が低く上の方が高い状態で連続的に
変化した空間が得られる。そのため管内の水が最下部か
ら凍り始め、上部に向かって順次凍っていく。一定時間
を経て槽内の温度が曲げ加工に適した硬度の氷となる温
度に達したところで管を取り出し、ベンダーに掛けて曲
げ加工するものである。Liquid nitrogen is jetted below the open shelf and the vaporized cold nitrogen gas rises around a tube containing water standing on the open shelf. By directing the flow of low-temperature nitrogen gas from the bottom to the top of the tank in this way, a space in which the temperature in the tank changes continuously with the lower temperature being lower and the upper temperature being higher is obtained. .. Therefore, the water in the pipe begins to freeze from the bottom, and gradually freezes toward the top. After a certain period of time, when the temperature in the tank reaches a temperature at which ice with a hardness suitable for bending is reached, the pipe is taken out and hung on a bender for bending.
【０００７】[0007]
【実施例】図は本発明に係る凍結装置の構成の一実施例
を示す縦断正面図である。例えば内外二重壁の間に発泡
ポリウレタン等の断熱材を充填して構成した蓋付断熱槽
１内の下部に透かし棚２を設けて、その棚２から上の空
間を冷却部３、棚２の下の空間を整流部４とし、また、
冷却部３の一側に上下を開けて衝立壁５を設けることに
よって衝立壁５と断熱槽１の側壁部分との空間を対流部
６としている。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a vertical sectional front view showing an embodiment of the structure of a freezing device according to the present invention. For example, a watermark shelf 2 is provided in the lower part of a heat insulating tank 1 with a lid configured by filling a heat insulating material such as polyurethane foam between inner and outer double walls, and a space above the shelf 2 is provided with a cooling unit 3 and a shelf 2. The space below is the rectification unit 4, and
The space between the partition wall 5 and the side wall portion of the heat insulation tank 1 is defined as a convection section 6 by opening the partition wall 5 on one side of the cooling unit 3 and opening the top and bottom.
【０００８】冷却部３は、曲げ加工する複数本の管Ｐを
一度に立てて置ける広さと高さを持っている。整流部４
の対流部６側の端に、液体窒素噴出用ノズル７が整流部
４の方を向いて設置されている。そして整流部４に、窒
素ガスを透かし棚２を通して冷却部３に向かわせるため
の整流板８が複数枚取付けられている。The cooling unit 3 has such an area and height that a plurality of pipes P to be bent can be set upright at once. Rectifier 4
A liquid nitrogen jetting nozzle 7 is installed at the end of the convection section 6 side facing the rectifying section 4. A plurality of straightening plates 8 for directing nitrogen gas to the cooling unit 3 through the watermark shelf 2 are attached to the straightening unit 4.
【０００９】対流部６は、その上下で冷却部３および整
流部４に通じており、対流部６の途中に槽内温度調節用
の温度センサー９を臨ませ、また、循環撹拌用ファン１
０が置かれている。対流部６の上部において断熱槽１の
側壁に排気口１１が開いているとともに、その排気口１
１の前に整流板１２が配置されている。温度センサー９
は、液体窒素噴出用ノズル７を自動開閉する電磁バルブ
（図に省略）の遠隔制御装置に通じている。The convection section 6 communicates with the cooling section 3 and the rectification section 4 above and below, a temperature sensor 9 for controlling the temperature inside the tank is exposed in the middle of the convection section 6, and the circulation stirring fan 1 is also provided.
0 is placed. At the upper part of the convection section 6, an exhaust port 11 is opened on the side wall of the heat insulation tank 1, and the exhaust port 1
The straightening vane 12 is arranged in front of 1. Temperature sensor 9
Is connected to a remote control device of an electromagnetic valve (not shown) that automatically opens and closes the nozzle 7 for ejecting liquid nitrogen.
【００１０】実施例における断熱槽１の蓋１Ａは、該槽
１の上面に設けた蝶番１Ｂによる上下開閉式の蓋である
が、蓋の位置、蓋の開閉構造に限定はない。１Ｃは蓋１
Ａの取っ手、１３はファン駆動用のモーターである。液
体窒素噴出用ノズル７は、前記の電磁バルブを経て液体
窒素ボンベに接続されている。The lid 1A of the heat insulation tank 1 in the embodiment is a vertically openable lid with a hinge 1B provided on the upper surface of the tank 1, but the position of the lid and the lid opening / closing structure are not limited. 1C is a lid 1
A handle, 13 is a motor for driving the fan. The liquid nitrogen jetting nozzle 7 is connected to the liquid nitrogen cylinder via the electromagnetic valve.
【００１１】曲げ加工する管Ｐはその一端に栓Ｓをして
中に水Ｗを入れ、これを透かし棚２の上に栓Ｓの側を下
にして立てる。ノズル７から液体窒素を噴出させるとと
もにファン１０を回す。ノズル７から出た霧状液体窒素
は整流部４に向かい、液体窒素が被加工管Ｐに直接触れ
ることはない。整流部４で気化した窒素ガスは、整流板
８とファン１０の作用によって透かし棚２を抜けて冷却
部３内を急速上昇し、対流部６に流入する。対流部６に
入った窒素ガスの一部は排気口１１から排出され、他は
ファン１０による流れに乗る。この低温窒素ガスが冷却
部３内で被加工管Ｐの間を通って上昇する間に管Ｐが冷
却され、該管Ｐ内の水Ｗは下から上に凍っていく。The pipe P to be bent is provided with a stopper S at one end thereof, water W is put therein, and the pipe P is erected on the openwork shelf 2 with the side of the stopper S facing down. Liquid nitrogen is ejected from the nozzle 7 and the fan 10 is rotated. The atomized liquid nitrogen discharged from the nozzle 7 goes to the flow straightening unit 4, and the liquid nitrogen does not directly contact the pipe P to be processed. The nitrogen gas vaporized in the rectifying unit 4 passes through the watermark shelf 2 by the action of the rectifying plate 8 and the fan 10, rapidly rises in the cooling unit 3, and flows into the convection unit 6. Part of the nitrogen gas that has entered the convection section 6 is discharged from the exhaust port 11, and the other part is carried by the fan 10. The pipe P is cooled while the low-temperature nitrogen gas rises between the pipes P to be processed in the cooling unit 3, and the water W in the pipe P freezes from bottom to top.
【００１２】対流部６にある温度センサー９は熱交換後
の窒素ガスの温度を検知するので、被加工管Ｐ内の水
温、水量、あるいは管径の変化に対して、その都度、設
定温度を変える必要はない。また、その温度センサー９
で得られる測定値を遠隔制御装置にフィードバックさ
せ、必要に応じて電磁バルブを遠隔操作で自動開閉させ
てノズル７からの窒素ガスの噴出量を制御する。すなわ
ち槽内は常時対流しており、槽内の温度が上がったとき
だけ窒素ガスを噴出させるものである。Since the temperature sensor 9 in the convection section 6 detects the temperature of the nitrogen gas after the heat exchange, the set temperature is set for each change in the water temperature, the water amount, or the pipe diameter in the pipe P to be processed. No need to change. Also, the temperature sensor 9
The measured value obtained in step 1 is fed back to the remote control device, and the electromagnetic valve is automatically opened and closed by remote control as necessary to control the amount of nitrogen gas ejected from the nozzle 7. That is, the inside of the tank is always convected, and the nitrogen gas is ejected only when the temperature inside the tank rises.
【００１３】[0013]
【発明の効果】本発明に係る凍結装置は上記のように、
断熱槽内に、一端に栓をして水を詰めた管を栓側を下に
して立てる透かし棚を設け、その透かし棚の下方に液体
窒素を噴出するノズルを配置するとともに断熱槽の上部
に排気口を設け、透かし棚の上に立てた管の間を窒素ガ
スが下から上に向かって流れるように構成したから次の
効果を持っている。冷却用の液体窒素は、一端に栓をし
て水を詰めた管が立っている透かし棚より下に噴射され
るので、管に液体窒素が直接触れることがなくて管の低
温ぜい性を生じない。また、気化した低温の窒素ガス
は、透かし棚の上に立っている水が入った管の周りを上
昇し、その低温窒素ガスの上昇に伴って管内の水が最下
部から凍り始めるので、氷は上に向かって膨張し、氷の
膨張に伴う管径の肥大、栓の外れ、氷のひび割れを起こ
さないもので、続く管の冷凍曲げ加工を精密且つ容易に
行うことができる。As described above, the freezing device according to the present invention has the following features.
Inside the heat insulation tank, a watermark shelf with a pipe filled with water with one end plugged down is installed, and a nozzle for ejecting liquid nitrogen is placed below the watermark shelf and at the top of the heat insulation tank. Since it has an exhaust port and nitrogen gas flows from the bottom to the top between pipes placed on the open shelf, it has the following effects. Liquid nitrogen for cooling is sprayed below the openwork shelf where a pipe filled with water is plugged at one end, and the liquid nitrogen does not come into direct contact with the pipe, thus reducing the low temperature embrittlement of the pipe. Does not happen. Also, the vaporized low-temperature nitrogen gas rises around the pipe containing water standing on the open shelf, and as the low-temperature nitrogen gas rises, the water inside the pipe begins to freeze from the bottom, so ice Expands upward, and does not cause enlargement of the pipe diameter due to the expansion of ice, detachment of plugs, and cracking of ice, so that the subsequent freezing bending of the pipe can be performed precisely and easily.
【図１】本発明に係る凍結装置の縦断正面図。FIG. 1 is a vertical sectional front view of a freezing device according to the present invention.
１ 断熱槽 ２ 透かし棚 ３ 冷却部 ４ 整流部 ５ 衝立壁 ６ 対流部 ７ 液体窒素噴出ノズル ８ 整流板 ９ 温度センサー １０ ファン １１ 排気口 １２ 整流板 １３ モーター １Ａ 蓋 1 Heat Insulation Tank 2 Watermark Shelf 3 Cooling Section 4 Rectification Section 5 Partition Wall 6 Convection Section 7 Liquid Nitrogen Jet Nozzle 8 Rectification Plate 9 Temperature Sensor 10 Fan 11 Exhaust Port 12 Rectification Plate 13 Motor 1A Lid
Claims (1)
管を栓側を下にして立てる透かし棚を設け、その透かし
棚の下方に液体窒素を噴出するノズルを配置するととも
に断熱槽の上部に排気口を設け、透かし棚の上に立てた
管の間を窒素ガスが下から上に向かって流れるようにし
たことを特徴とする管の冷凍曲げ加工における凍結装置1. A heat-insulating tank is provided with a watermark shelf in which a pipe with one end plugged with water is placed with the plug side facing down, and a nozzle for ejecting liquid nitrogen is arranged below the watermark shelf. A freezing device for freezing and bending of pipes, characterized in that an exhaust port is provided in the upper part of the heat insulation tank so that nitrogen gas flows between the pipes set up on the openwork shelf from the bottom to the top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03335774A JP3081327B2 (en) | 1991-11-25 | 1991-11-25 | Freezing equipment for freeze bending of tubes. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03335774A JP3081327B2 (en) | 1991-11-25 | 1991-11-25 | Freezing equipment for freeze bending of tubes. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05138256A true JPH05138256A (en) | 1993-06-01 |
| JP3081327B2 JP3081327B2 (en) | 2000-08-28 |
Family
ID=18292304
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03335774A Expired - Fee Related JP3081327B2 (en) | 1991-11-25 | 1991-11-25 | Freezing equipment for freeze bending of tubes. |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3081327B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0718053A1 (en) * | 1994-12-23 | 1996-06-26 | Metpela Oy | Method for freezing a liquid used for bending a double-wall pipe |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8492507B2 (en) | 2008-09-23 | 2013-07-23 | Nexam Chemical Ab | Acetylenic polyamide |
-
1991
- 1991-11-25 JP JP03335774A patent/JP3081327B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0718053A1 (en) * | 1994-12-23 | 1996-06-26 | Metpela Oy | Method for freezing a liquid used for bending a double-wall pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3081327B2 (en) | 2000-08-28 |
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