JPH02217791A - Electrically insulated heat pipe - Google Patents
Electrically insulated heat pipeInfo
- Publication number
- JPH02217791A JPH02217791A JP3568689A JP3568689A JPH02217791A JP H02217791 A JPH02217791 A JP H02217791A JP 3568689 A JP3568689 A JP 3568689A JP 3568689 A JP3568689 A JP 3568689A JP H02217791 A JPH02217791 A JP H02217791A
- Authority
- JP
- Japan
- Prior art keywords
- heat pipe
- heat
- electrically insulating
- electrically insulated
- sealed
- 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
- 239000003566 sealing material Substances 0.000 claims abstract description 17
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 claims abstract description 3
- 239000012530 fluid Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract 3
- 239000011521 glass Substances 0.000 abstract 2
- 239000007788 liquid Substances 0.000 abstract 1
- 239000004065 semiconductor Substances 0.000 description 12
- 238000010292 electrical insulation Methods 0.000 description 8
- 230000017525 heat dissipation Effects 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- 238000010521 absorption reaction Methods 0.000 description 7
- 238000005219 brazing Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 229910000833 kovar Inorganic materials 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000001465 metallisation Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- AJDIZQLSFPQPEY-UHFFFAOYSA-N 1,1,2-Trichlorotrifluoroethane Chemical compound FC(F)(Cl)C(F)(Cl)Cl AJDIZQLSFPQPEY-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910017709 Ni Co Inorganic materials 0.000 description 1
- 229910003267 Ni-Co Inorganic materials 0.000 description 1
- 229910003262 Ni‐Co Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- NEIHULKJZQTQKJ-UHFFFAOYSA-N [Cu].[Ag] Chemical compound [Cu].[Ag] NEIHULKJZQTQKJ-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Landscapes
- Thermal Insulation (AREA)
- Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野］
本発明はサイリスク等の電力半導体素子の冷却に用いら
れる電気絶縁性と強度を改善した電気絶縁型ヒートパイ
プに関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electrically insulated heat pipe with improved electrical insulation and strength, which is used for cooling power semiconductor devices such as Cyrisk.
（従来の技術とその課題）
従来からサイリスク等の半導体冷却用としてヒートパイ
プを利用した電気絶縁型ヒートパイプが知られている。(Prior art and its problems) Electrically insulated heat pipes using heat pipes have been known for cooling semiconductors such as Cyrisk.
この電気絶縁型ヒートパイプは第４図に示すよう一端が
半球状または円錐状に絞られその先端を密閉したヒート
パイプ（１）を放熱部とし、同様にして密閉されたヒー
トパイプ（１′）を吸熱部とし、この放熱部と吸熱部の
中間をコバールなどの封着材（２）、（２′）を介して
アルミナなどの電気絶縁筒（３）により接続され、内部
にフロンなどの電気絶縁性の作動液を封入したものであ
る。そしてこのヒートパイプは、吸熱部が半導体装着し
たアルミなどの金属ブロックに挿入され、半導体の発生
熱を金属ブロックを介して吸熱し、放熱部のヒートパイ
プに装着されたフィンにより放熱する半導体の冷却用な
どに用いられるやしかし従来の電気絶縁型ヒートパイプ
においては、電気絶縁筒にアルミナ含有率が９０％程度
の低アルミナの焼成体が用いられているため電気絶縁性
が悪く、またヒートパイプと電気絶縁筒との接続に封着
材としてコバール（Ｆｅ−Ｎｉ−Ｃｏ合金、商品名）が
用いられているが、Ｃｏ含有のため入手が困難で接続性
や強度が弱く、特に振動を常時受ける電車の車載用冷却
器として用いる場合、耐振性が低下しヒートパイプの特
性が劣化する問題があった。As shown in Fig. 4, this electrically insulated heat pipe has a heat pipe (1) whose one end is constricted into a hemispherical or conical shape and whose tip is sealed as a heat dissipation section, and a heat pipe (1') which is sealed in the same way. is the heat absorbing part, and the middle of the heat dissipating part and the heat absorbing part is connected by an electrically insulating tube (3) made of alumina or the like through a sealant (2), (2') such as Kovar, It is filled with insulating hydraulic fluid. In this heat pipe, the heat absorbing part is inserted into a metal block such as aluminum on which the semiconductor is mounted, and the heat generated by the semiconductor is absorbed through the metal block, and the heat is radiated by the fins attached to the heat pipe in the heat dissipating part to cool the semiconductor. However, in conventional electrically insulated heat pipes, which are used for various purposes, the electrically insulating tube uses a low alumina sintered body with an alumina content of about 90%, which has poor electrical insulation properties and is difficult to use as a heat pipe. Kovar (Fe-Ni-Co alloy, trade name) is used as a sealing material for connection with electrical insulation cylinders, but it is difficult to obtain because it contains Co, and its connectivity and strength are weak, especially when it is subject to constant vibration. When used as an on-board cooler for a train, there was a problem that the vibration resistance was reduced and the characteristics of the heat pipe deteriorated.
本発明は上記の問題について検討の結果、電気絶縁性が
高く、振動に対する強度が優れ、特に車載用冷却器とし
て好適な電気絶縁型ヒートパイプを開発したものである
。As a result of studies on the above-mentioned problems, the present invention has developed an electrically insulated heat pipe that has high electrical insulation properties, excellent strength against vibrations, and is particularly suitable as an on-vehicle cooler.
〔課題を解決するための手段および作用〕本発明は一端
が半球状または円錐状に絞られその先端を密閉した２本
のヒートパイプをそれぞれ放熱部と加熱部とし、該放熱
部と吸熱部との中間を封着材を介して電気絶縁筒で接続
し、作動液として電気絶縁性の流体を封入してなる電気
絶縁型ヒートパイプにおいて、該電気絶縁筒を９２〜９
５％のαアルミナを含有する焼成体で形成し、かつ電気
絶縁筒の空間距離を３０躯以上、沿面距離を４５鴫以上
としたことを特徴とする電気絶縁型ヒートパイプである
。[Means and effects for solving the problem] The present invention has two heat pipes each having one end constricted into a hemispherical or conical shape and the tip of which is sealed, each serving as a heat radiating section and a heating section. In an electrically insulated heat pipe, the electrically insulating tube is connected between the two via a sealing material with an electrically insulating tube filled with an electrically insulating fluid as a working fluid.
This is an electrically insulated heat pipe formed of a fired body containing 5% alpha alumina, and characterized in that the spatial distance of the electrically insulating cylinders is 30 or more, and the creepage distance is 45 or more.
すなわち本発明は、第１図に示すように、一端が半球状
または円錐状に絞られ、その先端を密閉したヒートパイ
プ（１）を放熱部とし、同様にして密閉されたヒートパ
イプ（１′）を吸熱部とし、放熱部と吸熱部との中間に
封着材（２）、（２′）を介して電気絶縁筒として、材
質を例えば９２〜９５％のαアルミナを含有する焼成体
で形成し、空間距離を３０ａ以上、沿面距ｒＩＩを４５
１１Ｉ１１以上とした電気絶縁筒で接続し、内部に電気
絶縁性の作動液を封入したものである。That is, as shown in FIG. 1, the present invention uses a heat pipe (1) whose one end is constricted into a hemispherical or conical shape and whose tip is sealed as a heat radiating section, and a similarly sealed heat pipe (1'). ) is the heat absorbing part, and the sealing material (2), (2') is interposed between the heat dissipating part and the heat absorbing part to form an electrically insulating cylinder, and the material is, for example, a fired body containing 92 to 95% alpha alumina. with a clearance distance of 30a or more and a creepage distance rII of 45
They are connected by an electrically insulating cylinder having a diameter of 11I11 or more, and an electrically insulating working fluid is sealed inside.
しかして本発明において、電気絶縁筒の材質として９２
〜９５％のαアルミナを含有する焼成体を用いるのは、
電車等の車輌用として必要なＡＣ１０ｋｖ以上の絶縁電
圧を確保するにはこの範囲の高アルミナの焼成体でなけ
れば得られないからである。However, in the present invention, the material of the electrically insulating cylinder is 92
Using a fired body containing ~95% alpha alumina is
This is because in order to secure an insulation voltage of AC 10 kV or more required for vehicles such as trains, it is necessary to use a fired body of high alumina in this range.
また上記の絶縁電圧を確保するには、同時に電気絶縁筒
の空間距離（絶縁筒の長さ）を３０ｉｏ以上にする必要
があり、沿面距離（絶！！筒表面に形成する波の総延長
の長さ）を４５Ｍ以上とする必要がある。空間距離、沿
面距離とも、これ未満では良好な電気絶縁が得られない
が、あまり大きくとると高価になるので２０％増程度が
適当である。In addition, in order to ensure the above insulation voltage, it is also necessary to make the spatial distance (length of the insulating cylinder) of the electrically insulating cylinder 30io or more, and the creepage distance (absolutely!) length) must be 45M or more. If both the spatial distance and the creepage distance are less than this, good electrical insulation cannot be obtained, but if they are too large, the cost will increase, so an increase of about 20% is appropriate.
このように本発明においては電気絶縁筒の材質とその形
状を的確に選定することにより良好な電気絶縁が得られ
るものであるが、さらに上記の電気絶縁筒の内面にポー
ラス面加工を施し、熱性能を高め外面にガラス状のグレ
ーズ処理を施すことにより、電気絶縁性の長期安定性を
保つことができる。（汚れによる劣化がない）。In this way, in the present invention, good electrical insulation can be obtained by appropriately selecting the material and shape of the electrically insulating cylinder, but the inner surface of the electrically insulating cylinder is further processed to have a porous surface, so that it can be heated easily. By increasing performance and applying a glass-like glaze treatment to the outer surface, long-term stability of electrical insulation can be maintained. (No deterioration due to dirt).
また電気絶縁筒とヒートパイプとの接続に使用される封
着材としては、コバールに代えてＮｉ４２％程度を含む
比較的入手容易な鉄−ニッケル合金を用いることにより
、絶縁筒と熱膨張率を限りなく近づけることにより上記
のアルミナ絶縁筒とのロウ接方を増し、振動や熱サイク
ルに対して強度を高めることができる。この際封着材は
、電気絶縁筒との接続面に第２図に示すように鍔状の折
り曲げ部（４）、（４′）を設けることにより絶縁筒と
の接合面積が増えて結合力が大きくなる。また封着材の
別の端部にも外側に拡がる加工部（５）、（５′）を施
して置くとヒートパイプを挿入する際、容易に挿入でき
ると共にロウ材の溜りとなり良好にロウ接できる。さら
に電気絶縁筒の封着材と接する両端面にはＭｇ−Ｍｏ系
等の合金のメタライジングを施して置くと封着材とのブ
レージングによる接合を良好に行なうことができ、結合
力が高まる。In addition, as the sealing material used to connect the electrically insulating tube and the heat pipe, a relatively easily available iron-nickel alloy containing about 42% Ni was used instead of Kovar, so that the thermal expansion coefficient between the insulating tube and the heat pipe could be reduced. By bringing them as close as possible, it is possible to increase the brazing contact with the alumina insulating cylinder and increase the strength against vibrations and thermal cycles. At this time, the sealing material is provided with flange-like bent parts (4) and (4') on the connection surface with the electrically insulating tube, as shown in Figure 2, so that the bonding area with the insulating tube is increased and the bonding strength is increased. becomes larger. In addition, if the other end of the sealing material is provided with processed parts (5) and (5') that expand outward, it will be easier to insert the heat pipe, and the solder material will accumulate, resulting in good soldering. can. Furthermore, if metallization of an alloy such as Mg-Mo is applied to both end faces of the electrically insulating cylinder that are in contact with the sealing material, good bonding with the sealing material can be achieved by brazing, and the bonding strength can be increased.
本発明におい°Ｃ上記の放熱部、吸熱部に用いられる、
銅、アルミニウム、ステンレス鋼などのものが使用でき
、その内面にはウィックの作用をなすｖ字状を始め種々
の形状の条溝を設けることができる、またヒートパイプ
の一端が半球状または円錐状に絞られるのは、この形状
に加工を施して密閉する方が密閉し易く、かつ完全にシ
ールできるからである。In the present invention, °C is used for the heat dissipation section and the heat absorption section above.
Materials such as copper, aluminum, and stainless steel can be used, and grooves of various shapes, including a V-shape that acts as a wick, can be provided on the inner surface, and one end of the heat pipe can be hemispherical or conical. The reason why it is narrowed down to this is because it is easier to seal by processing this shape and sealing it completely.
さらに上記のヒートパイプの断面形状は円形、楕円形の
他公知の種々の形状のものが適用でき、その径も放熱部
、吸熱部と異なる径のものを用いて、放熱、吸熱特性を
変えることも可能であり、また放熱部にフィンを設けて
放熱特性を高めることができる。なお本発明のヒートパ
イプを半導体冷却用として使用するときは、半導体装着
された金属ブロックに吸熱部のヒートパイプを挿入し、
ロウ付げにより金属ブロックと一体化し、半導体の熱を
金属ブロックを介して吸熱し、放熱部のヒートパイプに
設けられたフィンにより、自然放熱またはファンを用い
て強制放熱して半導体を冷却するものである。Furthermore, the cross-sectional shape of the heat pipe described above can be circular, oval, or various other known shapes, and the heat dissipation and heat absorption characteristics can be changed by using a heat pipe with a diameter different from that of the heat dissipation section and the heat absorption section. It is also possible to provide fins in the heat dissipation section to improve heat dissipation characteristics. When using the heat pipe of the present invention for cooling semiconductors, insert the heat pipe of the heat absorption part into the metal block mounted with the semiconductor,
A device that is integrated with a metal block by brazing, absorbs heat from the semiconductor through the metal block, and cools the semiconductor by natural heat radiation or forced heat radiation using a fan using fins provided on the heat pipe of the heat radiation part. It is.
〔実施例］
外径２２．２３ＩＩＩｌｌｌ、長さ３００ｍと１２０Ｉ
ｆａの鋼管の一端を円錐状と半円球に絞られた第１図に
示すヒートパイプ（１）を放熱部、（１′）を吸熱部と
し、この中間にアルミナ含有率９２％のαアルミナ粉を
１５００〜１８００ ’Ｃで焼成した内径２０．８５■
、長さ３０＋＋ｍ、沿面距離４５鵬の波形形状の電気絶
縁筒（３）を第２図に示すＮｉ４２％の鉄−ツケル合金
からなる端部が鍔状の折曲げ部（４）、（４′）を有す
る封着材（２）、（２′）とＭｎ−Ｍｏのメタライジン
グを施してロウ付は接続し、封着材の他端の外側に拡げ
られた加工部（５）、（５′）とヒートパイプ（１）、
（１′）を銀−銅共晶ロウ材で気密度よ＜ （１０−
”Ｔｏｒｒ・ｌ／ｓｅｃ以下）ロウ付けした１次にヒー
トパイプの一端を密閉した後、その片端より、ヒートパ
イプの内部を脱気し、フロン１１３の作動液を所定量注
入し密閉してヒートパイプ化した。[Example] Outer diameter 22.23IIIll, length 300m and 120I
The heat pipe (1) shown in Fig. 1, in which one end of the FA steel pipe is constricted into a conical shape and a semicircular shape, is used as a heat dissipation part, and heat pipe (1') is used as a heat absorption part. Inner diameter 20.85cm of powder fired at 1500-1800'C
, a corrugated electric insulating tube (3) with a length of 30++ m and a creepage distance of 45 mm is shown in FIG. ) with the sealing material (2), (2') and Mn-Mo metallization are applied to connect the soldered parts, and the processed parts (5), (5) are expanded outward from the other end of the sealing material. ') and heat pipe (1),
(1') with silver-copper eutectic brazing material to achieve airtightness < (10-
(Torr・l/sec or less) After sealing one end of the brazed primary heat pipe, the inside of the heat pipe is degassed from one end, and a predetermined amount of Freon 113 working fluid is injected, sealed and heated. Made into a pipe.
この電気絶縁型ヒートパイプを用いて第３図に示すよう
に金属ブロック（６）に吸熱部のヒートパイプ（１′）
を挿入してハンダにより接合して一体化し、放熱部のヒ
ートパイプ（１）には多数のフィン（７）を圧入装着し
て半導体冷却器とした。Using this electrically insulated heat pipe, the heat pipe (1') of the heat absorption part is attached to the metal block (6) as shown in Figure 3.
were inserted and joined together with solder to integrate them, and a large number of fins (7) were press-fitted into the heat pipe (1) of the heat dissipation part to form a semiconductor cooler.
この構造による冷却器によればサイリスタ等の半導体か
らの発熱は金属ブロックおよび吸熱部ヒートパイプを介
してフィンに伝達し、大気中に効率よく放熱される。According to the cooler having this structure, heat generated from a semiconductor such as a thyristor is transmitted to the fins via the metal block and the heat absorption part heat pipe, and is efficiently radiated into the atmosphere.
ここでサイリスク面は作動時にはｌＯｋν程度の高電位
を存し危険であるが、本発明によればこの高電圧は上記
の電気絶縁筒により完全に遮断されて放熱部側には伝達
されない。このため電気計装、補修、点検などのメンテ
ナンスが容易となり、特に電車に搭載されるＶＶＶＦイ
ンバーター制御装置内のサイリスク素子の冷却に好適で
ある。Here, the silisk surface has a high potential of about lOkv during operation, which is dangerous, but according to the present invention, this high voltage is completely cut off by the electrically insulating cylinder and is not transmitted to the heat radiating section. Therefore, maintenance such as electrical instrumentation, repair, and inspection becomes easy, and it is particularly suitable for cooling the cyrisk element in the VVVF inverter control device mounted on a train.
また本発明は上記のヒートパイプ、封着材および電気絶
縁筒の接続強度が高いため振動や熱サイクルによる接続
部のリーク度が非常に小さく （１０−’Ｔｏｒｒ ・
Ｉ！ ／ｓｅｅ以下）したがってヒートパイププの特性
が長期間保持できるものである。Furthermore, in the present invention, the connection strength between the heat pipe, the sealing material, and the electrically insulating tube is high, so the degree of leakage at the connection part due to vibration or thermal cycles is extremely small (10-' Torr
I! /see) Therefore, the characteristics of the heat pipe can be maintained for a long period of time.
以上に説明したように本発明によれば、電気絶縁性およ
び接続強度および熱サイクルに優れた電気絶縁型ヒート
パイプが得られたもので工業上顕著な効果を奏するもの
である。As explained above, according to the present invention, an electrically insulated heat pipe with excellent electrical insulation properties, connection strength, and thermal cycle is obtained, which has a significant industrial effect.
第１図は本発明の一実施例に係る電気絶縁型ヒートパイ
プの一部断面図、第２図は電気絶縁筒の一部断面図、第
３図は本発明の使用例を示すヒートパイプ式半導体冷却
器の一部断面図、第４図は従来ので電気絶縁型ヒートパ
イプの断面図である。
１・・・ヒートパイプ、 ２，２′・・・封着材、
３・・・電気絶縁筒、 ４．４′・・・折曲げ部、
５．５′・・・加工部、 ６・・・金属ブロック、
７・・・フィン。Fig. 1 is a partial sectional view of an electrically insulated heat pipe according to an embodiment of the present invention, Fig. 2 is a partially sectional view of an electrically insulated tube, and Fig. 3 is a heat pipe type showing an example of use of the present invention. FIG. 4 is a partial cross-sectional view of a semiconductor cooler, and FIG. 4 is a cross-sectional view of a conventional electrically insulated heat pipe. 1...Heat pipe, 2,2'...Sealing material,
3... Electrical insulating cylinder, 4.4'... Bent part,
5.5'... Processing part, 6... Metal block,
7...Fin.
Claims (4)
閉した２本のヒートパイプをそれぞれ放熱部と加熱部と
し、該放熱部と吸熱部との中間を封着材を介して電気絶
縁筒で接続し、作動液として電気絶縁性の流体を封入し
てなる電気絶縁型ヒートパイプにおいて、該電気絶縁筒
を９２〜９５％のαアルミナを含有する焼成体で形成し
、かつ電気絶縁筒の空間距離を３０ｍｍ以上、沿面距離
を４５ｍｍ以上としたことを特徴とする電気絶縁型ヒー
トパイプ。(1) Two heat pipes with one end constricted into a hemispherical or conical shape and their tips sealed are used as a heat radiating section and a heating section, respectively, and the middle between the heat radiating section and the heat absorbing section is electrically insulated via a sealing material. In an electrically insulating heat pipe connected by a cylinder and sealed with an electrically insulating fluid as a working fluid, the electrically insulating pipe is formed of a fired body containing 92 to 95% alpha alumina, and the electrically insulating pipe is An electrically insulated heat pipe characterized by having a spatial distance of 30 mm or more and a creepage distance of 45 mm or more.
外面にはガラス状のグレーズ処理が施されていることを
特徴とする請求項１記載の電気絶縁型ヒートパイプ。(2) The inner surface of the electrically insulating tube is processed with a porous surface,
2. The electrically insulated heat pipe according to claim 1, wherein the outer surface is treated with a glass-like glaze.
を特徴とする請求項１記載の電気絶縁型ヒートパイプ。(3) The electrically insulated heat pipe according to claim 1, wherein the sealing material is an iron-nickel alloy.
曲げられていることを特徴とする請求項１記載の電気絶
縁型ヒートパイプ。(4) The electrically insulated heat pipe according to claim 1, wherein the sealing material is bent into a brim shape at the joint with the electrically insulating cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3568689A JP2737792B2 (en) | 1989-02-15 | 1989-02-15 | Electric insulation type heat pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3568689A JP2737792B2 (en) | 1989-02-15 | 1989-02-15 | Electric insulation type heat pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02217791A true JPH02217791A (en) | 1990-08-30 |
| JP2737792B2 JP2737792B2 (en) | 1998-04-08 |
Family
ID=12448779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3568689A Expired - Fee Related JP2737792B2 (en) | 1989-02-15 | 1989-02-15 | Electric insulation type heat pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2737792B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0614764U (en) * | 1991-04-23 | 1994-02-25 | 株式会社日本アルミ | Electrically insulated heat pipe |
-
1989
- 1989-02-15 JP JP3568689A patent/JP2737792B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0614764U (en) * | 1991-04-23 | 1994-02-25 | 株式会社日本アルミ | Electrically insulated heat pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2737792B2 (en) | 1998-04-08 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |