JPS63149365A - Treatment of stainless steel pipe to prevent generation of gas - Google Patents
Treatment of stainless steel pipe to prevent generation of gasInfo
- Publication number
- JPS63149365A JPS63149365A JP29462686A JP29462686A JPS63149365A JP S63149365 A JPS63149365 A JP S63149365A JP 29462686 A JP29462686 A JP 29462686A JP 29462686 A JP29462686 A JP 29462686A JP S63149365 A JPS63149365 A JP S63149365A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- heat
- stainless steel
- gas
- water
- 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.)
- Pending
Links
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 23
- 239000010935 stainless steel Substances 0.000 title claims abstract description 23
- 239000007789 gas Substances 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000001301 oxygen Substances 0.000 claims abstract description 5
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 8
- 230000002265 prevention Effects 0.000 claims 2
- 238000010438 heat treatment Methods 0.000 abstract description 13
- 239000012530 fluid Substances 0.000 abstract description 11
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 229910000831 Steel Inorganic materials 0.000 abstract 3
- 239000010959 steel Substances 0.000 abstract 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- QDOXWKRWXJOMAK-UHFFFAOYSA-N chromium(III) oxide Inorganic materials O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の目的〕
（産業上の利用分野）
本発明、ステンレス鋼パイプのガス発生防止処理方法に
係り、特に車両の走行エンジンの排気ガスの熱をヒート
パイプの受熱用熱交換器内の作動流体に伝え、ヒートパ
イプの放熱部で空気を暖めて暖房を行なう車両暖房装置
における前記熱交換器に用いるステンレス鋼パイプの処
理方法に関する。[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention relates to a method for treating stainless steel pipes to prevent gas generation, and in particular, to a method for treating stainless steel pipes to prevent gas generation, and in particular to a method for collecting heat from exhaust gas from a vehicle running engine into a heat pipe. The present invention relates to a method for treating stainless steel pipes used in a heat exchanger in a vehicle heating system that heats air by transmitting heat to a working fluid in the heat exchanger and heating air in a heat radiating section of a heat pipe.
（従来の技術）
自動車のエンジンの排気管内のヒートパイプ受熱部で排
気ガスの熱を吸収し、吸収した熱を暖房用エアダクト内
のヒートパイプ放熱部で空気に与える形式のヒートパイ
プ式自動車暖房装置が知られている（特開昭５２−２４
６１７号公報参照）。(Prior art) A heat pipe type automobile heating system that absorbs heat from exhaust gas in a heat receiving section of a heat pipe in the exhaust pipe of an automobile engine, and gives the absorbed heat to the air in a heat dissipating section of a heat pipe in a heating air duct. is known (Japanese Unexamined Patent Publication No. 52-24
(See Publication No. 617).
この自動車暖房装置では、暖房が不要な時にはヒートパ
イプ放熱部での空気との熱交換を行なわないようにエア
ダクト内での空気の流通を停止させるが、ヒートパイプ
受熱部には、自動車の運転時に必ずエンジン排気が触れ
て通過し、受熱部は゛加熱される。In this car heating system, when heating is not required, the air flow in the air duct is stopped so that heat exchange with the air in the heat pipe heat dissipation part is not performed. The engine exhaust gas always passes through it, and the heat-receiving part is heated.
（発明が解決しようとする問題点）
エンジン排気ガスはその温度が最高８００℃にもなり、
したがって暖房不要時にもヒートパイプ受熱部の熱交換
器は８００℃近傍に加熱される。(Problem to be solved by the invention) The temperature of engine exhaust gas reaches a maximum of 800℃,
Therefore, even when heating is not required, the heat exchanger of the heat pipe heat receiving section is heated to around 800°C.
この熱交換器はステンレス鋼パイプにより構成されてお
り、その内部にヒートパイプ作動流体としての水が収容
されている。そして、ステンレス鋼パイプが水に触れつ
つ高温に加熱されると、ステンレス鋼中のクロムが水と
反応して非凝縮性のガスを発生する。この反応は次の化
学式で表わされる。This heat exchanger is constructed of stainless steel pipes, and water is contained therein as a heat pipe working fluid. When the stainless steel pipe is exposed to water and heated to high temperatures, the chromium in the stainless steel reacts with the water and generates non-condensable gas. This reaction is represented by the following chemical formula.
２Ｃｒ＋３Ｈ０−Ｃｒ２Ｏ３＋３Ｈ２
このようにして発生するＨ２は、ヒートパイプの作動温
度範囲では非凝縮性ガスで、ヒートパイプ内の水蒸気の
流れの妨げになるためヒートパイプの性能が劣化する。2Cr+3H0-Cr2O3+3H2 H2 generated in this way is a non-condensable gas in the operating temperature range of the heat pipe and obstructs the flow of water vapor within the heat pipe, thereby deteriorating the performance of the heat pipe.
したがって、これを排除することが望ましく、従来は、
ヒートパイプに設けたバルブを経て抜くようにしている
が、ヒートパイプを自動車に組込んでしまうと、ガス抜
きは不可能となってしまう。Therefore, it is desirable to eliminate this, and conventionally,
Gas is vented through a valve installed in the heat pipe, but once the heat pipe is installed in a car, it becomes impossible to vent the gas.
したがって、本発明は、ステンレス鋼パイプがエンジン
排気ガスにより加熱されてもガスが殆んど発生しないか
またはガス発生量がきわめて少なくなるようにステンレ
ス鋼パイプを処理する方法を提供するものである。Accordingly, the present invention provides a method for treating stainless steel pipes so that when the pipes are heated by engine exhaust gases, little or no gas is generated.
（問題点を解決するための手段）
本発明は、ステンレス鋼パイプを、酸素雰囲気中で１０
００℃近傍で所定時間、例えば１時間加熱し、表面に酸
化被膜を形成することによりガスの発生を防止する。(Means for Solving the Problems) The present invention provides stainless steel pipes for 10 minutes in an oxygen atmosphere.
The material is heated at around 00° C. for a predetermined time, for example, 1 hour, to form an oxide film on the surface to prevent gas generation.
（作 用）
このようにして酸化被膜を予め形成することにより、ス
テンレス鋼パイプが８００℃程度の排気ガスに触れても
前述の化学反応が起きることがなく、ガスの発生は防止
される。(Function) By forming the oxide film in advance in this way, even if the stainless steel pipe comes into contact with exhaust gas at about 800°C, the aforementioned chemical reaction does not occur, and gas generation is prevented.
（実施例）
以下、本発明の詳細な説明すると、図において、１は図
示しないエンジンからの燃焼排気ガスを排出する排気管
であり、この排気管１内には、ヒートパイプの受熱部２
が挿入配置され、その外周面には、外表面積を増大させ
て熱交換効率を向上させるために図示を省略したフィン
が設けられている。そして、ヒートパイプ内に封入され
た水、その他の作動流体は、この受熱部２において排気
管１内の排気ガスと熱交換して蒸発し、後述する放熱部
５側に送出されるようになっている。(Example) To explain the present invention in detail below, in the figure, 1 is an exhaust pipe for discharging combustion exhaust gas from an engine (not shown).
is inserted and arranged, and fins (not shown) are provided on the outer circumferential surface to increase the outer surface area and improve heat exchange efficiency. The water and other working fluids sealed in the heat pipe are evaporated by exchanging heat with the exhaust gas in the exhaust pipe 1 in the heat receiving section 2, and are then sent to the heat radiating section 5, which will be described later. ing.
一方、図示しない車内にファン３により暖房空気を送給
するエアダクト４内には、図示を省略した熱交換用フィ
ンを有するヒートパイプの放熱部５が挿入配置されてお
り、前記受熱部２で蒸気となった作動流体は、受熱部２
と放熱部５を結ぶ作動流体管７の軸心部を通ってこの放
熱部５に導かれるようになっている。そして、この放熱
部５において放熱し凝縮して液化した作動流体は、前記
作動流体管７の管壁内面に沿って流下し、再び受熱部２
内へ戻り、前述のように再び蒸発するようになっている
。On the other hand, a heat dissipating section 5 of a heat pipe having heat exchange fins (not shown) is inserted into an air duct 4 that supplies heated air by a fan 3 into the vehicle interior (not shown). The working fluid that has become
The working fluid is guided to the heat radiating part 5 through the axial center of the working fluid pipe 7 that connects the heat radiating part 5 to the working fluid pipe 7. The working fluid that has radiated heat, condensed, and liquefied in the heat radiating section 5 flows down along the inner surface of the pipe wall of the working fluid pipe 7, and returns to the heat receiving section 5.
It returns to the inside and evaporates again as mentioned above.
前記受熱部２を構成する熱交換器はステンレス鋼パイプ
を有し、その内部に作動流体としての水が常に存在して
おり、受熱部２がエンジン排気ガスで高温（空だき時に
は８００℃程度にもなる）に加熱されると、既述の化学
反応により非凝縮性ガスが発生する。The heat exchanger constituting the heat receiving section 2 has a stainless steel pipe, and water as a working fluid is always present inside the heat exchanger, and the heat receiving section 2 is heated to a high temperature (approximately 800 degrees Celsius when it is empty) by the engine exhaust gas. When heated to a temperature of 100%, a non-condensable gas is generated by the chemical reaction described above.
このようなガスの発生を防止するための処理は次のよう
にしてなされる。Treatment for preventing the generation of such gas is performed as follows.
まず、ステンレス鋼パイプを、熱交換器として組立てる
前または組立てた後に、炉中の酸素雰囲気中で１０００
℃程度に所定時間、例えば約１時間加熱する。これによ
り、ステンレス鋼パイプの表面に酸化被膜が形成され、
この被膜が、ステンレス鋼中のクロムと水の前述の反応
が起きないように、水とステンレス鋼を隔離する。これ
により、非凝縮性ガスの発生は激減する。First, stainless steel pipes are heated for 1000 hours in an oxygen atmosphere in a furnace before or after assembly as a heat exchanger.
℃ for a predetermined period of time, for example, about 1 hour. This forms an oxide film on the surface of the stainless steel pipe,
This coating isolates the water and the stainless steel so that the aforementioned reaction of chromium and water in the stainless steel does not occur. This dramatically reduces the generation of non-condensable gases.
実験によれば、処理の加熱時間を３０分にすると、ガス
発生量は３倍になり、処理の加熱時間を１０分にすると
、ガス発生量は６倍となった。したがって、約１時間の
加熱は望ましい。According to experiments, when the heating time of the treatment was increased to 30 minutes, the amount of gas generated tripled, and when the heating time of the treatment was increased to 10 minutes, the amount of gas generated was increased six times. Therefore, heating for about 1 hour is desirable.
以上のように加熱処理を行なうことにより、ステンレス
鋼は固溶化処理を施されたことになり、また材料調質お
よび加工歪の除去も同時に行なわれるので、熱交換器の
品質が向上する。By performing the heat treatment as described above, the stainless steel is subjected to solid solution treatment, and the quality of the heat exchanger is improved because material refining and processing strain are removed at the same time.
本発明の方法で処理をおこなうこにより、ステンレス鋼
パイプ製熱交換器は、水を収容した状態でエンジン排気
ガスにより加熱されても非凝縮性ガスの発生が少なく、
ヒートパイプの受熱部としてそれを用いた場合好ましい
効果が得られる。By processing according to the method of the present invention, the stainless steel pipe heat exchanger generates less non-condensable gas even when heated by engine exhaust gas while containing water.
Favorable effects can be obtained when it is used as a heat receiving part of a heat pipe.
図はヒートパイプ式自動車暖房装置の説明図である。
１・・・エンジン排気管、２・・・ヒートパイプ受熱部
、４・・・エアダクト、５・・・ヒートパイプ放熱部。The figure is an explanatory diagram of a heat pipe type automobile heating device. DESCRIPTION OF SYMBOLS 1... Engine exhaust pipe, 2... Heat pipe heat receiving part, 4... Air duct, 5... Heat pipe heat radiation part.
Claims (1)
加熱蒸発させる熱交換器に用いるステンレス鋼パイプを
、酸素雰囲気中で１０００℃近傍で所定時間加熱し表面
に酸化被膜を形成することを特徴とするステンレス鋼パ
イプのガス発生防止処理方法。 ２、所定時間が約１時間である特許請求の範囲第１項記
載のステンレス鋼パイプのガス発生防止処理方法。[Claims] 1. A stainless steel pipe used in a heat exchanger that heats and evaporates water stored inside by heat applied from the outside is heated in an oxygen atmosphere at around 1000°C for a predetermined period of time to form an oxide film on the surface. A gas generation prevention treatment method for stainless steel pipes, characterized by forming a stainless steel pipe. 2. A gas generation prevention treatment method for stainless steel pipes according to claim 1, wherein the predetermined time is about 1 hour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29462686A JPS63149365A (en) | 1986-12-12 | 1986-12-12 | Treatment of stainless steel pipe to prevent generation of gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29462686A JPS63149365A (en) | 1986-12-12 | 1986-12-12 | Treatment of stainless steel pipe to prevent generation of gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63149365A true JPS63149365A (en) | 1988-06-22 |
Family
ID=17810191
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29462686A Pending JPS63149365A (en) | 1986-12-12 | 1986-12-12 | Treatment of stainless steel pipe to prevent generation of gas |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63149365A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8316927B2 (en) * | 2006-06-09 | 2012-11-27 | Denso Corporation | Loop heat pipe waste heat recovery device with pressure controlled mode valve |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50102540A (en) * | 1974-01-18 | 1975-08-13 | ||
| JPS52104430A (en) * | 1976-03-01 | 1977-09-01 | Nissan Motor | Thermal reactor |
| JPS54128913A (en) * | 1978-03-22 | 1979-10-05 | Hitachi Metals Ltd | Method and apparatus for graphitizing pipes*mounted in pipe forming line |
| JPS61194168A (en) * | 1985-02-20 | 1986-08-28 | Ishikawajima Harima Heavy Ind Co Ltd | Treatment for passivation of stainless steel pipe |
| JPS61199065A (en) * | 1985-02-27 | 1986-09-03 | Ishikawajima Harima Heavy Ind Co Ltd | Method for passivating stainless steel material |
-
1986
- 1986-12-12 JP JP29462686A patent/JPS63149365A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50102540A (en) * | 1974-01-18 | 1975-08-13 | ||
| JPS52104430A (en) * | 1976-03-01 | 1977-09-01 | Nissan Motor | Thermal reactor |
| JPS54128913A (en) * | 1978-03-22 | 1979-10-05 | Hitachi Metals Ltd | Method and apparatus for graphitizing pipes*mounted in pipe forming line |
| JPS61194168A (en) * | 1985-02-20 | 1986-08-28 | Ishikawajima Harima Heavy Ind Co Ltd | Treatment for passivation of stainless steel pipe |
| JPS61199065A (en) * | 1985-02-27 | 1986-09-03 | Ishikawajima Harima Heavy Ind Co Ltd | Method for passivating stainless steel material |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8316927B2 (en) * | 2006-06-09 | 2012-11-27 | Denso Corporation | Loop heat pipe waste heat recovery device with pressure controlled mode valve |
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