JPH0556439B2 - - Google Patents
Info
- Publication number
- JPH0556439B2 JPH0556439B2 JP60101886A JP10188685A JPH0556439B2 JP H0556439 B2 JPH0556439 B2 JP H0556439B2 JP 60101886 A JP60101886 A JP 60101886A JP 10188685 A JP10188685 A JP 10188685A JP H0556439 B2 JPH0556439 B2 JP H0556439B2
- Authority
- JP
- Japan
- Prior art keywords
- heat insulating
- stainless steel
- insulating space
- tube
- silver mirror
- 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.)
- Expired - Lifetime
Links
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 46
- 229910052709 silver Inorganic materials 0.000 claims description 46
- 239000004332 silver Substances 0.000 claims description 46
- 229910001220 stainless steel Inorganic materials 0.000 claims description 24
- 239000010935 stainless steel Substances 0.000 claims description 23
- 238000007747 plating Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 9
- 238000007772 electroless plating Methods 0.000 claims description 4
- 229910000986 non-evaporable getter Inorganic materials 0.000 claims description 4
- 229910002058 ternary alloy Inorganic materials 0.000 claims description 4
- 238000009413 insulation Methods 0.000 description 13
- 238000004519 manufacturing process Methods 0.000 description 9
- 239000000243 solution Substances 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000001179 sorption measurement Methods 0.000 description 5
- 238000001994 activation Methods 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 3
- 230000004913 activation Effects 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 229930006000 Sucrose Natural products 0.000 description 1
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 229910001961 silver nitrate Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000005720 sucrose Substances 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Landscapes
- Chemically Coating (AREA)
- Thermal Insulation (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は発電プラントや化学プラント、航空
機、潜水艦等に於いて使用する真空断熱パイプの
改良に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to improvements in vacuum insulated pipes used in power plants, chemical plants, aircraft, submarines, and the like.
（従来の技術）
原子力発電プラントや航空機、潜水艦等に於い
ては、管路に高度な断熱性が要求され乍ら、断熱
スペースに制限が加えられる場合が屡々起生す
る。この様な場合には、所謂真空断熱パイプを使
用するのが最適であるが、ステンレス鋼を使用し
た真空断熱パイプには、現実に製造コストや断熱
性、真空度保持等の点に解決すべき問題が多く残
されている。(Prior Art) In nuclear power plants, aircraft, submarines, etc., pipes are required to have a high degree of insulation, but the insulation space is often limited. In such cases, it is best to use so-called vacuum insulated pipes, but vacuum insulated pipes made of stainless steel actually have some issues that need to be resolved in terms of production costs, insulation properties, maintaining the degree of vacuum, etc. Many problems remain.
例えば、断熱特性の一層の向上を図るために
は、断熱空間の内・外面の少なくとも一方に銀鏡
膜を形成し、輻射による熱損失を防止する必要が
ある。 For example, in order to further improve the heat insulation properties, it is necessary to form a silver mirror film on at least one of the inner and outer surfaces of the heat insulation space to prevent heat loss due to radiation.
しかし、ステンレス鋼の表面へ直接銀鏡膜を均
一且つ強固に固着させることは困難であり、現実
にはニツケルやクロムの中間層皮膜を形成したあ
と、その上に銀鏡膜を形成する様にしている。そ
の結果、メツキ工程が複雑になり、製造コストが
上昇することになる。 However, it is difficult to uniformly and firmly adhere a silver mirror film directly to the surface of stainless steel, and in reality, a silver mirror film is formed on top of an intermediate layer of nickel or chromium. . As a result, the plating process becomes complicated and manufacturing costs increase.
また、断熱性能を長期に亘つて保持するために
は断熱空間を高真空度に保持する必要があり、通
常はゲツタを断熱空間内へ配設して発生ガスを吸
着することにより、真空度を保持するようにして
いる。 In addition, in order to maintain insulation performance over a long period of time, it is necessary to maintain a high degree of vacuum in the insulated space, and usually a getter is placed inside the insulated space to adsorb the generated gas to lower the degree of vacuum. I try to keep it.
しかし、ゲツタは水分等に接するとガス吸着性
能が低下するため、ゲツタを断熱空間内へ取付け
た状態で銀鏡膜を形成することは不可能である。
従つて、必然的に断熱空間の内表面に銀鏡膜を形
成したあと、ゲツタの取付けを行なわねばなら
ず、組立工程が複雑化して製造コストの引下げが
困難になると共に、組立のための溶接等により銀
鏡膜に損傷が生じ易く、断熱性能が低下するとい
う問題がある。 However, since the gas adsorption performance of the getter decreases when it comes into contact with moisture or the like, it is impossible to form a silver mirror film with the getter attached in a heat insulating space.
Therefore, it is necessary to attach the getter after forming a silver mirror film on the inner surface of the heat insulating space, which complicates the assembly process and makes it difficult to reduce manufacturing costs. Therefore, there is a problem that the silver mirror film is easily damaged and the heat insulation performance is deteriorated.
（発明が解決しようとする問題点）
本発明は、上述の様なステンレス鋼を使用した
真空断熱パイプに於ける問題、即ち銀鏡膜の形
成工程が複雑なため、製造コストの引下げを図り
難いこと、銀鏡膜を形成してからゲツタを真空
断熱空間内へ取付けねばならないため、製造工程
が複雑化すると共に溶接等により銀鏡膜の損傷が
避けられないこと等の問題を解決せんとするもの
であり、秀れた断熱特性を長期に亘つて保持でき
ると共に、製造コストの大幅な引下げを可能とし
た、ステンレス鋼を利用した真空断熱パイプの提
供を目的とするものである。(Problems to be Solved by the Invention) The present invention solves the above-mentioned problem in vacuum insulated pipes using stainless steel, that is, it is difficult to reduce manufacturing costs because the process of forming the silver mirror film is complicated. This is an attempt to solve the problems of complicating the manufacturing process and unavoidable damage to the silver mirror film due to welding, etc., since the getter must be installed in the vacuum insulation space after forming the silver mirror film. The object of the present invention is to provide a vacuum insulated pipe made of stainless steel, which can maintain excellent heat insulation properties over a long period of time, and which can significantly reduce manufacturing costs.
（問題点を解決するための手段）
本願発明は、前記諸問題を解決するために、ス
テンレス鋼の外表面へ直接銀鏡膜を形成するこ
と、並びにゲツタを取付けた後に銀鏡膜を形成す
ることを課題として設定し、多数のステンレス鋼
外表面への銀鏡膜の直接形成試験を実施すると共
に、各種のゲツタについて、銀鏡膜形成処理がゲ
ツタの吸着性能に及ぼす影響について試験を行な
つた。(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention includes forming a silver mirror film directly on the outer surface of stainless steel and forming a silver mirror film after attaching the getter. As a subject, we carried out tests to directly form a silver mirror film on the outer surface of a large number of stainless steels, and also tested the effects of the silver mirror film formation treatment on the adsorption performance of various getters.
また、本願発明者は、前記各試験結果からス
テンレス鋼の外表面を適度に酸化させてその外表
面に酸化第二鉄を主体とする皮膜を形成すると、
ステンレス鋼の外表面へ直接的に所謂無電解メツ
キにより銀鏡膜を形成し得ること、及びZr−
Ｖ−Fe三元合金系非蒸発性ゲツタは、無電解銀
メツキ液や洗浄水等によつてそのガス吸着性能が
害されないこと、等を夫々知得した。 In addition, based on the above test results, the inventor of the present application has found that if the outer surface of stainless steel is appropriately oxidized to form a film mainly composed of ferric oxide on the outer surface,
It is possible to form a silver mirror film directly on the outer surface of stainless steel by so-called electroless plating, and Zr-
It has been learned that the gas adsorption performance of the V-Fe ternary alloy non-evaporable getter is not impaired by electroless silver plating solution, cleaning water, etc.
本願発明は前述の如き知見に基づいて発明され
たものであり、内管と外管の少なくとも一方がス
テンレス鋼製であり、チツプ管を通して断熱空間
の排気を行なうようにした真空断熱パイプに於い
て、前記内管及び外管と；断熱空間を形成する両
側端板と；前記断熱空間内に連通し、断熱空間の
排気後にその開口が封止されたチツプ管と；断熱
空間を形成するステンレス鋼製管の表面に形成し
た酸化皮膜と；
前記断熱空間内に配設したZr−Ｖ−Fe三元合
金系非蒸発性ゲツタと；前記ゲツタを配設した断
熱空間内へチツプ管を通して銀メツキ液を供給
し、無電解メツキ方式によりステンレス鋼製管の
表面の全部又は一部上に直接形成した銀鏡膜と
を、発明の基本構成とするものである。 The present invention was invented based on the above-mentioned knowledge, and provides a vacuum insulated pipe in which at least one of the inner tube and the outer tube is made of stainless steel, and the insulated space is evacuated through the chip tube. , the inner tube and the outer tube; both end plates forming a heat insulating space; a chip pipe communicating with the heat insulating space and having its opening sealed after exhausting the heat insulating space; stainless steel forming a heat insulating space. An oxide film formed on the surface of the pipe; A Zr-V-Fe ternary alloy non-evaporable getter placed in the heat insulating space; A silver plating liquid passed through the chip tube into the heat insulating space in which the getter was placed. The basic structure of the invention is to provide a silver mirror film directly on all or part of the surface of a stainless steel tube by an electroless plating method.
（作用）
ステンレス鋼の表面を適度に酸化させることに
より、その表面には、銀鏡反応の進行を阻害する
と想定される酸化第２クロムの割合が比較的少な
く且つ銀鏡反応に好影響を及ぼすと想定される酸
化第２鉄を主成分とする酸化皮膜が形成される。
その結果、銀メツキ液を接触させることにより、
所謂銀鏡反応が促進され、ステンレス鋼の表面に
直接銀鏡膜が形成されることになる。(Function) By appropriately oxidizing the surface of stainless steel, it is assumed that the proportion of chromic oxide, which is expected to inhibit the progress of the silver mirror reaction, will be relatively small on the surface and will have a positive effect on the silver mirror reaction. An oxide film containing ferric oxide as a main component is formed.
As a result, by contacting the silver plating liquid,
The so-called silver mirror reaction is promoted, and a silver mirror film is formed directly on the surface of the stainless steel.
また、予かじめゲツタを取付けた断熱空間内へ
銀メツキ液等を流入せしめても、ゲツタのガス吸
着性能には殆んど変化が無いため、銀鏡膜の形成
後に銀メツキ液を排出させ、断熱空間の排気後に
ゲツタを加熱して活性化することにより、断熱空
間の真空度は長期に亘つて高真空度に保持され
る。 Furthermore, even if a silver plating liquid or the like is allowed to flow into the heat insulating space where the getter is installed in advance, there is almost no change in the gas adsorption performance of the getter, so the silver plating solution is discharged after the silver mirror film is formed. By heating and activating the getter after the heat insulating space is evacuated, the degree of vacuum in the heat insulating space is maintained at a high degree of vacuum for a long period of time.
（実施例）
以下、図面に示す本発明の実施例に基づいて、
その詳細を説明する。第１図は真空断熱パイプの
縦断面図であり、図に於いて、１はステンレス鋼
（SUS304）製の内管（外径60.5mm、長さ400mm、
肉厚3.5mm）、２はステンレス鋼（SUS304）製の
外管（外径89.1mm、拡径部外径139.8mm、長さ
3868mm、肉厚2.1mm）、３及び４は断熱空間Ａを形
成するためのステンレス鋼（SUS304）製の端
板、５は断熱空間Ａ内と連通するチツプ管、６及
び７は内管の両端に取付けたフランジ、８は断熱
空間内に取付けたゲツタ（70wt％Zr−24.6wt％
Ｖ−5.4wt％Fe）である。(Example) Hereinafter, based on the example of the present invention shown in the drawings,
The details will be explained below. Figure 1 is a vertical cross-sectional view of a vacuum insulated pipe.
2 is an outer tube made of stainless steel (SUS304) (outer diameter 89.1 mm, expanded part outer diameter 139.8 mm, length
3868mm, wall thickness 2.1mm), 3 and 4 are stainless steel (SUS304) end plates for forming the heat insulation space A, 5 is a chip pipe communicating with the inside of the heat insulation space A, 6 and 7 are both ends of the inner pipe 8 is the getter (70wt%Zr−24.6wt%) installed in the insulation space.
V-5.4wt%Fe).
尚、本実施例に於いては内管１と外管２の両方
をステンレス鋼製としているが、何れか一方のみ
をステンレス鋼製としてもよいことは勿論であ
る。また、本実施例に於いては、ゲツタ８を外管
２の内側面に分散せしめて取付けているが、ゲツ
タ８の取付場所や取付個数は適宜には選定し得る
ものである。 In this embodiment, both the inner tube 1 and the outer tube 2 are made of stainless steel, but it goes without saying that only one of them may be made of stainless steel. Further, in this embodiment, the getters 8 are installed in a distributed manner on the inner surface of the outer tube 2, but the locations and number of getters 8 to be installed can be selected as appropriate.
一方、第２図は、第１図のイ−イ視断面図であ
り、図に於いては９は内管１の外表面及び外管２
の内表面に形成した酸化皮膜、１０は前記酸化皮
膜の上に形成した銀鏡膜である。 On the other hand, FIG. 2 is a sectional view taken along line A in FIG.
10 is a silver mirror film formed on the oxide film.
尚、本実施例に於いては、内・外管の両表面の
全部に銀鏡膜を形成しているが、何れか一方の表
面のみに銀鏡膜を形成してもよく、或いは表面の
一部分にのみ銀鏡膜を形成してもよい。 In this example, the silver mirror film is formed on the entire surface of both the inner and outer tubes, but the silver mirror film may be formed on only one of the surfaces, or on a part of the surface. A silver mirror film may be formed only on the surface.
次に、真空断熱パイプの製造方法について説明
する。先ず、所定の規格に合せて内管１と外管２
を形成する。次に内管１の外表面と外管２の内表
面を熱処理し、これに酸化皮膜を形成する。前記
熱処理は、ステンレス管を酸化性雰囲気中で燃成
することにより行なわれ、通常250〜550℃で５〜
120分間、好ましくは300〜450℃で10〜60分間
（本実施例では、空気中、350℃、30分間）間行な
われる。このステンレス鋼表面の酸化の度合い
は、焼成処理後のステンレス鋼表面の光沢度が、
焼成処理前の研磨表面の光沢度に比べて10〜50低
下する範囲が好適である。酸化の度合いが小さい
と、酸化第２クロムを多量に含有する酸化皮膜が
形成され、これによつて銀鏡反応が阻害されるか
らであり、また逆に過度に酸化されると、銀鏡反
応に好影響を与えると想定される酸化第２鉄が酸
化皮膜中に存在しなくなり、酸化クロムのみにな
るからである。 Next, a method for manufacturing a vacuum insulated pipe will be explained. First, the inner tube 1 and outer tube 2 are
form. Next, the outer surface of the inner tube 1 and the inner surface of the outer tube 2 are heat-treated to form an oxide film thereon. The heat treatment is performed by burning the stainless steel tube in an oxidizing atmosphere, and is usually heated at 250 to 550°C for 5 to 50 minutes.
It is carried out for 120 minutes, preferably at 300 to 450°C for 10 to 60 minutes (in the present example, in air at 350°C for 30 minutes). The degree of oxidation on the stainless steel surface is determined by the gloss level of the stainless steel surface after firing.
A range in which the gloss level is reduced by 10 to 50 points compared to the gloss level of the polished surface before baking treatment is suitable. If the degree of oxidation is small, an oxide film containing a large amount of chromic oxide will be formed, which will inhibit the silver mirror reaction.On the other hand, if the degree of oxidation is excessive, it will not be favorable for the silver mirror reaction. This is because ferric oxide, which is expected to have an effect, no longer exists in the oxide film, leaving only chromium oxide.
前記熱処理が終ると、外筒２の内表面にゲツタ
８を取付け、その後内管１、外管２、端板３及び
チツプ管５を溶接した端板４を夫々組付け、溶接
によりこれ等を組立てる。 After the heat treatment is completed, the getter 8 is attached to the inner surface of the outer tube 2, and then the inner tube 1, the outer tube 2, the end plate 3, and the end plate 4 to which the tip tube 5 is welded are assembled, and these are welded together. Assemble.
尚、前記ゲツタ８としては、Zr−Ｖ−Fe三元
合金系非蒸発性ゲツタが使用されており、Zr45
〜75wt％、V20〜50wt％、Fe35wt％から成る成
分組成（本実施例では、70wt％Zr、24.6wt％Ｖ、
5.4wt％Fe）のものが望ましい。 As the getter 8, a Zr-V-Fe ternary alloy non-evaporable getter is used, and Zr45
~75wt%, V20~50wt%, Fe35wt% (in this example, 70wt%Zr, 24.6wt%V,
5.4wt%Fe) is desirable.
各部材の組立が完了すれば、断熱空間Ａ内へハ
ロゲン第１錫を主成分とする活性化液（本実施例
では、ハロゲン化第１錫10PPMを含む水溶液）
をチツプ管５を通して注入し、酸化皮膜９を活性
化させる。その後、前記活性化液を排出して断熱
空間Ａ内を水洗する。 When the assembly of each member is completed, an activating solution containing a stannous halogen as a main component (in this example, an aqueous solution containing 10 PPM of stannous halide) is poured into the heat insulating space A.
is injected through the tip tube 5 to activate the oxide film 9. Thereafter, the activation liquid is discharged and the inside of the heat insulating space A is washed with water.
前記酸化皮膜の活性化処理は、銀鏡反応による
銀の析出速度を速めると同時に、均一に析出させ
るためのものであり、当該活性化処理を省略する
ことも可能である。 The activation treatment of the oxide film is intended to speed up the precipitation rate of silver by the silver mirror reaction and at the same time cause the silver to be deposited uniformly, and it is also possible to omit the activation treatment.
前記活性化処理が完了すれば、チツプ管５から
銀メツキ液を注入し、内・外管１，２の表面へ接
触せしめて所謂無電解メツキ方式により銀鏡膜１
０を形成する。その後、銀メツキ液の余剰分を排
出し、断熱空間Ａの水洗い及び乾燥を行なう。 When the activation process is completed, a silver plating solution is injected from the chip tube 5 and brought into contact with the surfaces of the inner and outer tubes 1 and 2 to form a silver mirror film 1 by a so-called electroless plating method.
form 0. Thereafter, the excess silver plating solution is discharged, and the heat insulating space A is washed with water and dried.
前記銀メツキ液としては、従来公知のものを使
用することができる。本実施例に於いては、Ａ液
（硝酸銀200ｇｒを少量の水に溶解させ、これに28
％アンモニヤ水10と水を加えて96とし、さら
に水酸化ナトリウム200ｇｒを溶解させた水溶液
４を加えて全量を100としたもの）とＢ液
（庶糖400ｇｒを水１に溶解させた水溶液に濃硝
酸５mlを加えて煮沸し、これに37％ホルムアルデ
ヒド水溶液100mlを加えた後、水を加えて全量を
100としたもの）とを容積比１：１の割合で混
合させて形成した銀メツキ液が使用されている。 As the silver plating solution, conventionally known ones can be used. In this example, Solution A (200g of silver nitrate was dissolved in a small amount of water,
Add 10% ammonia water and water to make 96, then add 4 of aqueous solution in which 200g of sodium hydroxide is dissolved to make the total volume 100) and B solution (add concentrated nitric acid to an aqueous solution of 400g of sucrose dissolved in 1 of water). Add 5 ml and boil, add 100 ml of 37% formaldehyde aqueous solution, and then add water to bring the total volume to a boil.
100) at a volume ratio of 1:1.
断熱空間Ａ内の銀鏡膜１０の形成が終了すれ
ば、チツプ管５の開口端に真空ポンプを接続し、
組立体を加熱（本実施例では400℃）しながら空
間Ａの排気とゲツタの活性化を行なう。排気によ
り空間Ａの真空度が10-4〜10-6Torr程度（本実
施例では10-6Torr）になれば、真空ポンプの運
転を止め、チツプ管５の開口端を圧縮して真空封
じを行ない、その後圧縮開口端を溶接する。 When the formation of the silver mirror film 10 in the heat insulating space A is completed, a vacuum pump is connected to the open end of the chip tube 5,
The space A is evacuated and the getter is activated while heating the assembly (400° C. in this example). When the degree of vacuum in the space A reaches approximately 10 -4 to 10 -6 Torr (10 -6 Torr in this example) due to evacuation, the operation of the vacuum pump is stopped and the open end of the chip tube 5 is compressed to seal it in vacuum. and then weld the compression opening end.
保温試験の結果によれば、内管１及び外管２の
表面には中間メツキ層を介して銀鏡膜を形成した
真空断熱パイプに比較して、保温性能が大幅に向
上する。例えば、100℃の加熱油を内管１内に充
満せしめた場合、本発明の真空断熱パイプでは、
６時間後及び24時間後の油温が88℃及び67℃であ
るのに対して、前記中間メツキ層を使用した真空
断熱パイプでは、夫々82℃及び60℃であつた。 According to the results of the heat retention test, the heat retention performance is significantly improved compared to a vacuum insulated pipe in which a silver mirror film is formed on the surfaces of the inner tube 1 and outer tube 2 via an intermediate plating layer. For example, when the inner pipe 1 is filled with heated oil at 100°C, in the vacuum insulated pipe of the present invention,
The oil temperatures after 6 hours and 24 hours were 88°C and 67°C, whereas in the vacuum insulated pipe using the intermediate plating layer, the oil temperatures were 82°C and 60°C, respectively.
又、約400℃のダウサム油を内管１内に充満さ
せて24時間放置した場合においても、本発明の真
空断熱パイプでは、前記中間メツキ層を使用した
真空断熱パイプと比較して、その温度差が20℃を
こえる保温効果が得られた。 Furthermore, even when the inner tube 1 is filled with dowsome oil at about 400°C and left for 24 hours, the vacuum insulated pipe of the present invention has a lower temperature than the vacuum insulated pipe using the intermediate plating layer. A heat retention effect with a difference of over 20°C was obtained.
さらに、断熱空間Ａの真空度は６ケ月経過後に
於いも当初の値と殆んど変化せず、ゲツタ８が所
定のガス吸着作用を果していること確認されてい
る。 Furthermore, the degree of vacuum in the heat insulating space A has hardly changed from the initial value even after 6 months have passed, confirming that the getter 8 is performing a predetermined gas adsorption function.
（発明の効果）
本発明は上述の通り、断熱空間のステンレス鋼
部の表面へ、酸化皮膜を介設して無電解方式によ
り銀鏡膜を形成するようにしているため、中間メ
ツキ層を介設した場合に比較して製造コストの引
下げが図れると共に、断熱性能も向上する。(Effects of the Invention) As described above, the present invention interposes an oxide film on the surface of the stainless steel part of the heat insulating space and forms a silver mirror film by an electroless method, so an intermediate plating layer is interposed. Compared to the case where this method is used, manufacturing costs can be reduced, and the insulation performance can also be improved.
また、空間部へゲツタを装着したあと銀鏡膜を
形成するようにしているため、製造工程が簡単化
されると共に、溶接等による銀鏡膜の損傷が皆無
となり、保温性能が一層向上する。 Furthermore, since the silver mirror film is formed after the getter is attached to the space, the manufacturing process is simplified, and there is no damage to the silver mirror film due to welding or the like, which further improves heat retention performance.
本発明は上述の通り、秀れた実用的効果を有す
るものである。 As mentioned above, the present invention has excellent practical effects.
第１図は、本発明に係る真空断熱パイプの一部
を省略した縦断面図である。第２図は、第１図の
イ−イ視拡大断面図である。
Ａ…断熱空間、１…内管、２…外管、３，４…
端板、５…チツプ管、８…ゲツタ、９…酸化皮
膜、１０…銀鏡膜。
FIG. 1 is a partially omitted vertical cross-sectional view of a vacuum insulated pipe according to the present invention. FIG. 2 is an enlarged sectional view taken along line A in FIG. 1. A...Insulating space, 1...Inner pipe, 2...Outer pipe, 3, 4...
End plate, 5... Chip tube, 8... Getter, 9... Oxide film, 10... Silver mirror film.
Claims (1)
ス鋼製であり、チツプ管５を通して断熱空間Ａの
排気を行なうようにした真空断熱パイプに於い
て、前記内管１及び外管２と；断熱空間を形成す
る両側端板３，４と；前記断熱空間Ａ内に連通
し、該断熱空間Ａの排気後にその開口が封止され
たチツプ管５と；前記断熱空間Ａを形成するステ
ンレス鋼製管の表面に形成した酸化皮膜９と；前
記断熱空間Ａの内部に配設したZr−Ｖ−Fe三元
合金系非蒸発性ゲツタ８と；前記ゲツタ８を配設
した断熱空間Ａ内へチツプ管５を通して銀メツキ
液を供給し、無電解メツキ方式によりステンレス
鋼製管の表面の全部又は一部上に直接形成した銀
鏡膜１０とより構成した真空断熱パイプ。1. In a vacuum insulated pipe in which at least one of the inner tube 1 and the outer tube 2 is made of stainless steel, and the adiabatic space A is evacuated through the chip tube 5, the inner tube 1 and the outer tube 2; End plates 3 and 4 on both sides forming a space; Chip pipe 5 communicating with the heat insulating space A and having its opening sealed after exhausting the heat insulating space A; Made of stainless steel forming the heat insulating space A. an oxide film 9 formed on the surface of the tube; a Zr-V-Fe ternary alloy non-evaporable getter 8 disposed inside the heat insulating space A; and a chip into the heat insulating space A in which the getter 8 is disposed. A vacuum insulated pipe constructed by supplying a silver plating solution through a pipe 5 and forming a silver mirror film 10 directly on all or part of the surface of a stainless steel pipe by an electroless plating method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60101886A JPS61262295A (en) | 1985-05-13 | 1985-05-13 | Vacuum heat-insulating pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60101886A JPS61262295A (en) | 1985-05-13 | 1985-05-13 | Vacuum heat-insulating pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61262295A JPS61262295A (en) | 1986-11-20 |
| JPH0556439B2 true JPH0556439B2 (en) | 1993-08-19 |
Family
ID=14312417
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60101886A Granted JPS61262295A (en) | 1985-05-13 | 1985-05-13 | Vacuum heat-insulating pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61262295A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4400917B2 (en) | 2004-01-22 | 2010-01-20 | 株式会社フジキン | Vacuum insulation valve |
| JP6118760B2 (en) * | 2014-05-30 | 2017-04-19 | モリテックスチール株式会社 | PM removal air purifier |
| JP2018123875A (en) * | 2017-01-31 | 2018-08-09 | トヨタ自動車株式会社 | Vacuum insulation pipe |
-
1985
- 1985-05-13 JP JP60101886A patent/JPS61262295A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61262295A (en) | 1986-11-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB2129117A (en) | Stainless steel vacuum bottle and its production | |
| JPH086168B2 (en) | Immobilization of carbon steel using encapsulated oxygen | |
| JPH0556439B2 (en) | ||
| US3609062A (en) | Getter pump | |
| CN107098603A (en) | A method for activating a built-in getter in vacuum glass | |
| GB1342923A (en) | Heat pipe manufacture | |
| US3598538A (en) | Directly heated gas dissociator | |
| US3164493A (en) | Method of applying an oxide coating to a metal tube | |
| JPH0698109B2 (en) | Metal vacuum double structure and manufacturing method thereof | |
| JPS6121356B2 (en) | ||
| JPS6237974B2 (en) | ||
| CN101145484A (en) | Manufacturing method of hot cathode fluorescent lamp with specification of T2-T1 | |
| CN203733478U (en) | Powerful inspiratory mixed wire used for nuclear fusion vacuum system | |
| JPS6220652B2 (en) | ||
| JPS61106120A (en) | Production of vacuum double container made of stainless steel | |
| JPS5912332B2 (en) | Hydrogen exhaust method and exhaust device | |
| JPS6332292A (en) | Heat pipe | |
| WO1979000924A1 (en) | Tubular heating element | |
| JPH0753137B2 (en) | Method for manufacturing metallic vacuum double structure | |
| CN117065705A (en) | A device and method for reducing oxygen and evacuation of tantalum powder, absorbing magnesium powder and absorbing carbon vapor | |
| JPS6214227B2 (en) | ||
| JPH0524619B2 (en) | ||
| SU674566A1 (en) | Device for pumping off hydrogen and its isotors | |
| JPS581992A (en) | Sheathed heater | |
| CN113123942A (en) | Getter micropump and preparation method thereof |