JPH02175881A - Production of pipe with porous inner surface - Google Patents
Production of pipe with porous inner surfaceInfo
- Publication number
- JPH02175881A JPH02175881A JP33069188A JP33069188A JPH02175881A JP H02175881 A JPH02175881 A JP H02175881A JP 33069188 A JP33069188 A JP 33069188A JP 33069188 A JP33069188 A JP 33069188A JP H02175881 A JPH02175881 A JP H02175881A
- Authority
- JP
- Japan
- Prior art keywords
- point metal
- melting
- metal powder
- melting point
- 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
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 53
- 229910052751 metal Inorganic materials 0.000 claims abstract description 53
- 239000000843 powder Substances 0.000 claims abstract description 42
- 238000002844 melting Methods 0.000 claims abstract description 33
- 230000008018 melting Effects 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 15
- 239000002245 particle Substances 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 3
- 239000011812 mixed powder Substances 0.000 claims description 2
- 238000007670 refining Methods 0.000 claims 1
- 239000010949 copper Substances 0.000 abstract description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052802 copper Inorganic materials 0.000 abstract description 3
- 230000004907 flux Effects 0.000 abstract description 3
- 229910052782 aluminium Inorganic materials 0.000 abstract description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 2
- 239000010410 layer Substances 0.000 abstract 4
- 239000002344 surface layer Substances 0.000 abstract 1
- 239000003507 refrigerant Substances 0.000 description 12
- 238000009835 boiling Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 8
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 229910052736 halogen Inorganic materials 0.000 description 2
- 150000002367 halogens Chemical class 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 229910017770 Cu—Ag Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
- F28F13/18—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by applying coatings, e.g. radiation-absorbing, radiation-reflecting; by surface treatment, e.g. polishing
- F28F13/185—Heat-exchange surfaces provided with microstructures or with porous coatings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/40—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Geometry (AREA)
- Powder Metallurgy (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、蒸発器用として使用される伝熱管の製造など
に有用な新規な内面多孔質管の製造方法に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing a novel internally porous tube useful for manufacturing heat exchanger tubes used in evaporators.
［従来の技術１
熱交換器用として使用される伝熱管は、伝熱面積を増大
させかつ冷媒の撹拌現象を促進させるために、平滑管の
ままではなく、表面に多数の清やｒＲ細な凹凸を形成し
て使用する例が多い。[Prior art 1] In order to increase the heat transfer area and promote the stirring phenomenon of the refrigerant, heat transfer tubes used for heat exchangers are not made of smooth tubes, but have many fine irregularities on the surface. There are many examples where it is formed and used.
とくに蒸発器用伝熱管においては、冷媒の沸騰の核とな
る多数の微小突起や微小空洞を管の内外表面に形成し、
蒸発性能を格段に高め、熱伝達効率の大巾な向上を図ろ
うとする技術が一般化しつつある。In particular, in heat exchanger tubes for evaporators, numerous microprotrusions and microcavities are formed on the inner and outer surfaces of the tube, which serve as the core of boiling of the refrigerant.
Technologies that aim to significantly improve evaporation performance and greatly improve heat transfer efficiency are becoming commonplace.
このような微小突起や微小空洞は、これを管の外表面に
形成するのは比較的容易であり、切削や転造などにより
消や突起を切り起しあるいは切り起した微小フィンを圧
縮して微小空洞化させたり、さらには各種の金属やセラ
ミックスを溶射したりして、容易に所望の表面を形成す
ることができる。It is relatively easy to form such microprotrusions and microcavities on the outer surface of the tube, and by cutting or rolling the protrusions or compressing the cut and raised microfins. A desired surface can be easily formed by forming micro cavities or by spraying various metals or ceramics.
しかし、そのような表面を形成する位置が細管の内面で
あったりすると、必ずしも容易ではなく、前記切削や溶
射等を用いることは困難である。However, when such a surface is formed on the inner surface of a thin tube, it is not always easy to form such a surface, and it is difficult to use the cutting, thermal spraying, etc. described above.
そこで、管内面を多孔質化し前記した冷媒沸騰の核を形
成するために、これまでにも種々な方法が提案されてき
た。すなわち、二重管を複合押出成形する方法、内面に
スプレーあるいは塗布する方法、内面にめっきする方法
、特殊の転造加工機により管内面に消や突起を形成する
方法などがそれである。Therefore, various methods have been proposed so far in order to make the inner surface of the tube porous and form the core of boiling of the refrigerant described above. Examples include a method of composite extrusion molding of a double pipe, a method of spraying or coating the inner surface, a method of plating the inner surface, and a method of forming a matte projection on the inner surface of the tube using a special rolling machine.
［発明が解決しようとする課題］
上記した既提案の方法にはいずれも一長一短があり、必
ずしも十分なものとはいえない。[Problems to be Solved by the Invention] All of the previously proposed methods described above have advantages and disadvantages, and cannot be said to be necessarily sufficient.
二重管の押出においては内管の製造に制約があり、十分
な多孔質化は困難である。内面にスプレーあるいは塗布
する場合、塗布する材料の制約がある上、単に塗布した
だけでは長期安定性に欠けるという問題がある。内面め
っき法は比較的安定した多孔質層を形成できるが、長尺
材の製造が困難である上、生産性に劣るという欠点があ
る。転造加工法は、工業的にみてもつとも優れた方法で
あるが、形成できるのは消や突起であって、冷媒の沸騰
の核とするにはやや不十分であり、核沸騰を著しく促進
させる微小な空洞を有する多孔質面を形成するには不向
きである上、変形抵抗の大きな鋼管などには適用できな
いという問題がある。In the extrusion of double tubes, there are restrictions on the manufacture of the inner tube, and it is difficult to make it sufficiently porous. When spraying or coating the inner surface, there are restrictions on the material to be coated, and there is a problem in that simply coating it lacks long-term stability. Although the inner surface plating method can form a relatively stable porous layer, it has the drawbacks that it is difficult to manufacture long materials and the productivity is poor. The rolling method is an excellent method from an industrial perspective, but the only thing that can be formed is a nucleated protrusion, which is insufficient to form a core for boiling of the refrigerant, and it significantly accelerates nucleate boiling. There are problems in that it is not suitable for forming a porous surface having minute cavities, and it cannot be applied to steel pipes or the like that have high deformation resistance.
本発明の目的は、上記したような従来技術の問題点を解
消し、冷媒の沸ＷＩＪ蒸発性能を大［１１に向上させる
ことができ、しかも経時的にも安定した強固な多孔質面
を形成し得る新規な内面多孔質管の製造方法を提供しよ
うとするものである。The purpose of the present invention is to solve the problems of the prior art as described above, to improve the boiling point WIJ evaporation performance of refrigerant by a large [11], and to form a strong porous surface that is stable over time. The present invention aims to provide a novel method for manufacturing a tube with a porous inner surface.
［課題を解決するための手段１
本発明は、管内面に低融点金属粉末と高融点金属粉末の
混合層を形成し、これを加熱して低融点金属粉末を溶融
させ、該低融点金属によって高融点金属粉末を管内面に
固着させると同時に、低融点金属と高融点金属とを相互
拡散させることにより微小空孔を形成させるものである
。[Means for Solving the Problems 1] The present invention forms a mixed layer of a low melting point metal powder and a high melting point metal powder on the inner surface of a tube, heats this to melt the low melting point metal powder, and the low melting point metal The high melting point metal powder is fixed to the inner surface of the tube, and at the same time, the low melting point metal and the high melting point metal are mutually diffused to form micropores.
［作用］
低融点金属粉末を溶融させれば、当該低融点金属と管材
との間に拡散が生じ管材と完全に一体・化する一方、溶
融しない高融点金属粉末を管内面に強固に固着させて、
沸騰の核となり得る高融点金属粉末の微小突起を形成す
ることができる。さらに、両金属の混合粉末相互間で拡
散を生じさせれば、拡散した後に微小空孔が残存形成さ
れ、それらが冷媒沸騰にとって最適な核となり、上記微
小突起と相俟って沸騰蒸発性能を顕著に向上させ、大巾
な熱伝達効率の改善を達成することができる。[Function] When the low melting point metal powder is melted, diffusion occurs between the low melting point metal and the pipe material, completely integrating with the pipe material, while the high melting point metal powder that does not melt is firmly fixed to the inner surface of the pipe. hand,
It is possible to form microprotrusions of high melting point metal powder that can become boiling nuclei. Furthermore, if diffusion occurs between the mixed powders of both metals, micropores will remain after the diffusion, and these will become the optimal nucleus for refrigerant boiling, and together with the microprojections mentioned above, the boiling evaporation performance will be improved. The heat transfer efficiency can be significantly improved and a large improvement in heat transfer efficiency can be achieved.
［実施例］ 以下に、本発明について実施例を参照し説明する。[Example] The present invention will be described below with reference to Examples.
本発明においては、管１の内面に第１図に示すようにま
ず低融点金属粉末と高融点金属粉末との混合層２を形成
する。In the present invention, a mixed layer 2 of low melting point metal powder and high melting point metal powder is first formed on the inner surface of the tube 1, as shown in FIG.
これら混合すべき金属粉末材料の選択においては、本発
明が期待する目的に照し、相互に拡散可能な組合せとす
る必要があるが、それ以外において材料的にとくに限定
はされない。In selecting these metal powder materials to be mixed, it is necessary to select a combination that can be mutually diffusible in view of the expected purpose of the present invention, but other than that, there are no particular limitations on the materials.
一般に管材として使用されるのは、熱伝導性の良好な鋼
管やアルミ管あるいは強度の大きい鉄鋼管などであるか
ら、上記それぞれを参照すれば、金属粉末の組合せはＣ
ｕ −３ｎ 、Ｃｕ−Ａｇ、Ｃｕ −Ａｕ 、Ａｊ−Ｚ
ｎ 、Ｓｉ −ＡＪ 。Generally, the pipe materials used are steel pipes, aluminum pipes, or strong steel pipes with good thermal conductivity, so if you refer to each of the above, the combination of metal powders is C.
u-3n, Cu-Ag, Cu-Au, Aj-Z
n, Si-AJ.
５ｎ−Ｉｎ等が考えられる。5n-In etc. can be considered.
本発明に係る製造方法の実施においては、前述した蒸発
器用伝熱管がその主たる対象となるが、その場合上記し
た冷媒の沸騰において核となる微小空孔の形成が望まれ
る。金属粉末を相互拡散させ、それによってそのような
空孔を発生させるには、粉末の粒径に一定の大きさが必
要である。すなわち、粒径が小にすぎれば溶融した一方
の金属中に完全拡散するかあるいは全体が均一的拡散と
なってしまい、空孔の発生は起らない、また、粒径が大
きすぎれば、多孔質面積が低減し、期待するような性能
の向上がみられなくなる上、溶融した側の金属による溶
融しない金属の機械的固定力が不十分となる。＄１々な
実験結果によれば、高融点側金属粉末の平均粒径が０．
０１〜３１ｍの範囲となるように選択し、低融点金属粉
末も混合のし易さなどからみてそれに見合った粒径とす
ることが望ましいことが判明した。In carrying out the manufacturing method according to the present invention, the above-mentioned heat exchanger tube for an evaporator is the main target, and in that case, it is desired to form micropores that become cores in the boiling of the refrigerant. In order to interdiffuse the metal powders and thereby generate such pores, a certain size of the powder particles is required. In other words, if the particle size is too small, it will be completely diffused into one of the molten metals, or it will be uniformly diffused throughout, and no pores will be generated.If the particle size is too large, porous The quality area decreases, and the expected improvement in performance is not seen, and the mechanical fixation force of the metal that is not melted by the metal on the melted side becomes insufficient. According to various experimental results, the average particle size of the high melting point metal powder is 0.
It has been found that it is desirable to select a particle size in the range of 0.01 to 31 m, and to make the particle size of the low melting point metal powder commensurate with this in view of ease of mixing.
なお、本発明に係る多孔質層を内面平滑管の内壁に形成
してもよいが、管１の内面に管の長手り向に平行又は第
２図に示ずような傾斜角を有するらせん消１ａを形成し
、その上に上記した多孔質層を形成すれば、上記冷媒の
沸騰促進効果と同時に清により冷媒が十分に撹拌され、
内壁面全体に冷媒の供給が盛んになり、伝熱特性を一段
と向上させることができる。The porous layer according to the present invention may be formed on the inner wall of a tube with a smooth inner surface. 1a and the above-mentioned porous layer formed thereon, the refrigerant is sufficiently stirred by the clear water at the same time as having the effect of promoting boiling of the refrigerant.
The refrigerant is supplied to the entire inner wall surface, and the heat transfer characteristics can be further improved.
また、第１図のように管１内面に金属粉末混合層２を形
成するには、金属混合粉末をフラックス液等によりペー
スト状とし、これを適当な方法により管１の内面に均一
厚さとなるように塗布すればよい、このように塗布した
後に、低融点金属の融点以上で高融点金属および管材の
融点以下に加熱してやれば、低融点金属粉末が溶融し、
管内面への融着による高融点金属粉末の固定効果と同時
に高融点金属粉末との間で相互拡散が生じ、前述した微
小空孔が形成される。In addition, in order to form the metal powder mixed layer 2 on the inner surface of the tube 1 as shown in FIG. After applying it in this way, if it is heated above the melting point of the low melting point metal and below the melting point of the high melting point metal and the pipe material, the low melting point metal powder will melt.
Simultaneously with the fixation effect of the high melting point metal powder due to fusion to the inner surface of the tube, mutual diffusion occurs between the high melting point metal powder and the above-mentioned micropores.
実施例１
外径１８關、肉厚２浦の鉄管内面にｓｎ粉末（粒径５０
μｍ、重量比４０％）とＣｕ粉末（粒径８０μｍ、重量
比４０％）及びハロゲン系液状フラックス（重量比２０
％）の混合物をペースト状とし塗布した。これを真空炉
中で７００℃Ｘ３ｈｒ熱処理したところ、Ｃｕ粉は溶融
ｓｎによって管内に固定されさらにＣｕと相互拡散する
ことによりＣｕ粉衣表面は多数のボイド（空孔）が生じ
所望の多孔質面が生成された。Example 1 Sn powder (particle size 50
μm, weight ratio: 40%), Cu powder (particle size: 80 μm, weight ratio: 40%), and halogen-based liquid flux (weight ratio: 20%)
%) was made into a paste and applied. When this was heat-treated at 700°C for 3 hours in a vacuum furnace, the Cu powder was fixed in the tube by molten sn and further interdiffused with Cu, resulting in a large number of voids (pores) on the surface of the Cu powder coating, creating the desired porous surface. was generated.
実施例２
外径１２．７市、肉厚０．９ｍｍの銅管内面に深さ０．
３ｗ、ＩＪｏ、２ｎｍのらせん状溝を加工しておき、こ
れにＳｎ粉末（粒径５０μｍ、重量比５０％）とＣｕ粉
末（粒径８０μｍ、重量比３０％）及びハロゲン系液状
フラックス（重量比２０％）を混合してペースト状とし
たものを塗布した。これを真空炉中で７００℃Ｘ３ｈｒ
熱処理を行なったところ、ｓｎは銅管内表面とＣＵ粉の
双方に相互拡散し管内表面とＣｕ粉衣表面多数のボイド
（空孔）が生じ多孔質面が生成された。Example 2 A copper tube with an outer diameter of 12.7 cm and a wall thickness of 0.9 mm has a depth of 0.0 mm on the inner surface.
A spiral groove of 3W, IJo, and 2 nm was machined, and Sn powder (particle size 50 μm, weight ratio 50%), Cu powder (particle size 80 μm, weight ratio 30%), and halogen-based liquid flux (weight ratio 20%) was mixed into a paste and applied. This was heated in a vacuum furnace at 700℃ for 3 hours.
When the heat treatment was performed, sn was mutually diffused into both the inner surface of the copper tube and the CU powder, and a large number of voids (pores) were generated on the inner surface of the tube and the surface of the Cu powder, resulting in a porous surface.
実施例３
上記実施例２の方法によって製造した内面多孔質管を用
いフレオン蒸発伝熱特性を測定した。測定条件は下記の
通りである。Example 3 Freon evaporation heat transfer characteristics were measured using the internally porous tube manufactured by the method of Example 2 above. The measurement conditions are as follows.
冷 媒：フレオンＲ２２
冷媒質量速度： ２００ｋｇ／ｍ” −Ｓ乾 き
度＝０．６
測定の結果、多孔質処理をしない内面消付管と比較して
上記実施例管は、５Ｋｗ／ｍ”において１５％、３０Ｋ
ｗ／ｍ！において６０％の性能向上が確認された。Refrigerant: Freon R22 Refrigerant mass velocity: 200kg/m”-S dry
degree = 0.6 As a result of the measurement, compared to the internal fire extinguishing pipe without porous treatment, the above-mentioned example pipe has a resistance of 15% at 5Kw/m'' and 30K
w/m! A 60% improvement in performance was confirmed.
［発明の効果］
以上の通り、本発明によれば、管内面にきわめて安定性
の高い多孔質層を管と一体的に形成することができるも
のであり、特殊な治具や工具を必要としないために長尺
化が可能であるなど、工業上においてきわめて有用なも
のがある。[Effects of the Invention] As described above, according to the present invention, an extremely stable porous layer can be integrally formed on the inner surface of a tube, and special jigs and tools are not required. There are some products that are extremely useful in industry, such as the fact that they can be made into long lengths because they do not need to be used.
第１図は管内面に金属粉末混合層を塗布した状態を示す
説明図、第２図は管内面にらせん状溝を形成した様子を
示す半割断面図である。
１：管、
ｌａ：らせん状溝、
２：金属粉末混合層。
なお、上記は本発明に係る内面多孔質管を伝熱管として
使用する場合について説明したが、伝熱管のみに限定さ
れるものではなく、多孔質面による吸収あるいは触媒作
用などそれ以外の用途にも適用できるものである。FIG. 1 is an explanatory view showing a state in which a metal powder mixed layer is applied to the inner surface of the tube, and FIG. 2 is a half-cut sectional view showing a state in which spiral grooves are formed on the inner surface of the tube. 1: tube, la: spiral groove, 2: metal powder mixed layer. In addition, although the above description has been made regarding the case where the internally porous tube according to the present invention is used as a heat transfer tube, it is not limited to use only as a heat transfer tube, and may also be used for other purposes such as absorption or catalytic action by the porous surface. It is applicable.
Claims (3)
層を形成し、これを加熱して低融点金属粉末を溶融させ
、該低融点金属によって高融点金属粉末を管内面に固着
させると同時に、低融点金属と高融点金属とを相互拡散
させることにより微小空孔を形成させる内面多孔質管の
製造方法。(1) Form a mixed layer of low melting point metal powder and high melting point metal powder on the inner surface of the tube, heat this to melt the low melting point metal powder, and fix the high melting point metal powder to the tube inner surface with the low melting point metal. At the same time, a method for manufacturing an internally porous tube in which micropores are formed by mutually diffusing a low melting point metal and a high melting point metal.
る溝を形成し、その上に低融点金属と高融点金属の混合
粉末層を形成し、その後加熱して請求項１記載の多孔質
化処理を施す内面多孔質管の製造方法。(2) forming grooves parallel to or inclined at an angle in the longitudinal direction of the tube on the inner surface of the tube, forming a mixed powder layer of a low melting point metal and a high melting point metal thereon, and then heating the porous groove according to claim 1; A method for manufacturing an internally porous pipe that undergoes a refining treatment.
範囲とする請求項１又は２記載の内面多孔質管の製造方
法。(3) The method for producing an internally porous tube according to claim 1 or 2, wherein the average particle size of the high melting point metal powder is in the range of 0.01 to 3 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33069188A JPH02175881A (en) | 1988-12-27 | 1988-12-27 | Production of pipe with porous inner surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33069188A JPH02175881A (en) | 1988-12-27 | 1988-12-27 | Production of pipe with porous inner surface |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02175881A true JPH02175881A (en) | 1990-07-09 |
| JPH0520508B2 JPH0520508B2 (en) | 1993-03-19 |
Family
ID=18235494
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33069188A Granted JPH02175881A (en) | 1988-12-27 | 1988-12-27 | Production of pipe with porous inner surface |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02175881A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994000613A1 (en) * | 1992-06-22 | 1994-01-06 | Pratco Industries Limited | Hard facing |
| EP1718781A1 (en) * | 2004-02-13 | 2006-11-08 | Kyung Hyun Ko | Porous coated member and manufacturing method thereof using cold spray |
| WO2007076110A2 (en) * | 2005-12-22 | 2007-07-05 | Luvata Franklin, Inc. | Grooved porous surface, production method and application in heat transfer |
| EP1852669A1 (en) * | 2006-05-02 | 2007-11-07 | Samsung Gwangju Electronics Co., Ltd. | Heat exchanger for refrigerator and method for manufacturing a tube thereof |
| JP2009109037A (en) * | 2007-10-26 | 2009-05-21 | General Electric Co <Ge> | Heat transfer promoting system and manufacturing method of heat transfer device |
-
1988
- 1988-12-27 JP JP33069188A patent/JPH02175881A/en active Granted
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994000613A1 (en) * | 1992-06-22 | 1994-01-06 | Pratco Industries Limited | Hard facing |
| GB2282826A (en) * | 1992-06-22 | 1995-04-19 | Pratco Ind Ltd | Hard facing |
| GB2282826B (en) * | 1992-06-22 | 1996-03-20 | Pratco Ind Ltd | Hard facing |
| EP1718781A1 (en) * | 2004-02-13 | 2006-11-08 | Kyung Hyun Ko | Porous coated member and manufacturing method thereof using cold spray |
| JP2007522346A (en) * | 2004-02-13 | 2007-08-09 | コウ，キョンヒョン | Porous coating member and method for producing the same using low temperature spraying method |
| EP1718781A4 (en) * | 2004-02-13 | 2009-03-18 | Solmics Co Ltd | Porous coated member and manufacturing method thereof using cold spray |
| WO2007076110A2 (en) * | 2005-12-22 | 2007-07-05 | Luvata Franklin, Inc. | Grooved porous surface, production method and application in heat transfer |
| WO2007076110A3 (en) * | 2005-12-22 | 2007-10-04 | Luvata Franklin Inc | Grooved porous surface, production method and application in heat transfer |
| EP1852669A1 (en) * | 2006-05-02 | 2007-11-07 | Samsung Gwangju Electronics Co., Ltd. | Heat exchanger for refrigerator and method for manufacturing a tube thereof |
| JP2009109037A (en) * | 2007-10-26 | 2009-05-21 | General Electric Co <Ge> | Heat transfer promoting system and manufacturing method of heat transfer device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0520508B2 (en) | 1993-03-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |