JP3165265B2 - Manufacturing method of aluminum flat tube for heat exchanger - Google Patents
Manufacturing method of aluminum flat tube for heat exchangerInfo
- Publication number
- JP3165265B2 JP3165265B2 JP29619592A JP29619592A JP3165265B2 JP 3165265 B2 JP3165265 B2 JP 3165265B2 JP 29619592 A JP29619592 A JP 29619592A JP 29619592 A JP29619592 A JP 29619592A JP 3165265 B2 JP3165265 B2 JP 3165265B2
- Authority
- JP
- Japan
- Prior art keywords
- flat tube
- layer
- heat exchanger
- aluminum
- aluminum flat
- 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 - Fee Related
Links
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
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/02—Tubular elements of cross-section which is non-circular
- F28F1/022—Tubular elements of cross-section which is non-circular with multiple channels
-
- 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
- F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
- F28F1/126—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element consisting of zig-zag shaped fins
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
- F28F19/06—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings of metal
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
- F28F21/081—Heat exchange elements made from metals or metal alloys
- F28F21/084—Heat exchange elements made from metals or metal alloys from aluminium or aluminium alloys
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Geometry (AREA)
- Extrusion Of Metal (AREA)
- Coating By Spraying Or Casting (AREA)
- Heat Treatment Of Articles (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、偏平管搬送時のＺｎ
層の欠落（部分的な欠け落ち、剥離をいうものとす
る。）を防止することができるとともに、熱処理後にお
ける偏平管のＡｌ層の肉厚減少を防いで偏平管の強度低
下やクラックの発生を防止することのできる熱交換器用
アルミニウム偏平管の製造方法に関する。BACKGROUND OF THE INVENTION The present invention relates to a method for transporting Zn in a flat tube.
Layer loss (referred to as partial chipping or peeling) can be prevented, and the thickness of the Al layer of the flat tube after heat treatment can be prevented from being reduced, thereby lowering the strength of the flat tube and generating cracks. The present invention relates to a method for manufacturing an aluminum flat tube for a heat exchanger that can prevent the occurrence of cracks.
【０００２】[0002]
【従来の技術及びその課題】従来、この種の熱交換器用
アルミニウム偏平管の製造方法として、熱間又は温間で
押出成形したアルミニウム偏平管の表面に、Ｚｎ線の溶
射法によってＺｎを溶射し、これを自然冷却することに
よって偏平管の表面にＺｎ拡散浸透層（Ｚｎ拡散層）を
形成させて前記Ｚｎ層をアルミニウム偏平管の外表面に
密着させる方法が知られている。2. Description of the Related Art Conventionally, as a method of manufacturing this type of aluminum flat tube for a heat exchanger, Zn is sprayed onto a surface of an aluminum flat tube extruded hot or warm by a Zn wire spraying method. A method is known in which a Zn diffusion-penetrated layer (Zn diffusion layer) is formed on the surface of a flat tube by naturally cooling it, and the Zn layer is adhered to the outer surface of the aluminum flat tube.
【０００３】ところが、この方法により熱交換器用アル
ミニウム偏平管を製造する場合、Ｚｎを溶射した後の偏
平管をローラで搬送する際に、該偏平管がいまだ高温で
あるために軟質のＺｎ層がローラとの接触によって偏平
管表面から削り取られてしまい、製品欠陥を生ずるとい
う課題があった。また、この方法により製造された熱交
換器用アルミニウム偏平管では、偏平管製造時において
十分な厚さのＺｎ拡散浸透層が形成されているため、そ
の後、偏平管にフィン材をろう付けする等の熱処理（こ
の熱処理は一般的に必ず行われる。）を加えた際に、そ
の熱により更にＺｎ拡散浸透層の形成が進行し、犠牲陽
極として働くＺｎ拡散浸透層の厚さが必要以上に厚くな
る。従って偏平管のＡｌ層の厚さが薄くなってしまい、
腐食によってＺｎ拡散浸透層が容易に浸食されるため偏
平管自体の強度低下をもたらすとともに、局部的なクラ
ックの発生を引き起こすという課題があった。[0003] However, when manufacturing an aluminum flat tube for a heat exchanger by this method, when the flat tube after spraying Zn is transported by a roller, the flat Zn tube is still at a high temperature, so that a soft Zn layer is formed. There has been a problem that the flat tube surface is scraped off from the surface of the flat tube due to contact with the roller, thereby causing a product defect. In addition, in the aluminum flat tube for a heat exchanger manufactured by this method, a Zn diffusion infiltration layer having a sufficient thickness is formed at the time of manufacturing the flat tube, and thereafter, a fin material is brazed to the flat tube. When a heat treatment is performed (this heat treatment is generally always performed), the heat further promotes the formation of the Zn diffusion-penetration layer, and the thickness of the Zn diffusion-penetration layer serving as a sacrificial anode becomes unnecessarily thick. . Therefore, the thickness of the Al layer of the flat tube becomes thin,
There is a problem that the corrosion of the Zn diffusion-penetrated layer is easily eroded by corrosion, so that the strength of the flat tube itself is reduced and a local crack is generated.
【０００４】本発明は上記の如き事情に鑑みてなされた
ものであり、偏平管搬送時のＺｎ層の欠落を防止すると
ともに、熱処理後の製品の使用中における偏平管のＡｌ
層の肉厚減少を防いで偏平管の強度低下やクラックの発
生を防止することのできるろう付け型熱交換器用アルミ
ニウム偏平管の製造方法を提供することを目的とする。The present invention has been made in view of the above-mentioned circumstances, and it is intended to prevent the Zn layer from being lost during the transport of a flat tube and to reduce the Al content of the flat tube during use of the heat-treated product.
An object of the present invention is to provide a method of manufacturing an aluminum flat tube for a brazed type heat exchanger, which can prevent a decrease in the thickness of a layer and prevent a decrease in strength of the flat tube and generation of cracks.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決すべく種
々研究を重ねた結果、発明者らは、Ｚｎ層付着後、熱処
理前の偏平管を急冷することによりＺｎ層の固化、低温
化を促進させて、偏平管をローラで搬送する際のＺｎ層
の欠落が防止できるとともに、この段階での拡散層の形
成が抑制でき、さらに、このようにして製造された偏平
管にフィン材をろう付けする等の熱処理を加えることに
より、Ａｌ層の表面部に形成されるＺｎ拡散層の厚さが
必要以上に厚くなることを防止し、熱処理後の製品の使
用中における偏平管のＡｌ層の肉厚減少を防げるという
知見を得た。As a result of various studies to solve the above problems, the inventors found that after the Zn layer was deposited, the flat tube before the heat treatment was rapidly cooled to solidify the Zn layer and lower the temperature. By promoting this, it is possible to prevent the Zn layer from being lost when the flat tube is transported by the rollers, to suppress the formation of the diffusion layer at this stage, and to further fin the flat tube manufactured in this manner with a fin material. By applying a heat treatment such as attaching, the thickness of the Zn diffusion layer formed on the surface portion of the Al layer is prevented from becoming unnecessarily thick, and the Al layer of the flat tube during the use of the product after the heat treatment is removed. It was found that wall thickness reduction can be prevented.
【０００６】本発明は上記の知見に基づいてなされたも
のであり、以下、添付図面を参照して詳細に説明する。[0006] The present invention has been made based on the above findings, and will be described in detail below with reference to the accompanying drawings.
【０００７】図１は本発明方法を実施する態様を示す正
面図である。同図において、符号１は押出機、符号２は
加熱されたビレット４を押出穴６内に保持するコンテ
ナ、符号８は押出穴６の先端側に設けられたダイス、符
号１０はビレット４をダイス８側に押し出すステム、符
号１２は溶射ガン１４が複数個配設されたＺｎ溶射機、
符号１６はエアー吹出部、符号１８は水槽、符号２０は
フリーローラである。FIG. 1 is a front view showing an embodiment for carrying out the method of the present invention. In the figure, reference numeral 1 denotes an extruder, reference numeral 2 denotes a container for holding a heated billet 4 in an extrusion hole 6, reference numeral 8 denotes a die provided at the tip side of the extrusion hole 6, reference numeral 10 denotes a die for the billet 4. The stem pushed out to the side 8, reference numeral 12 is a Zn spraying machine in which a plurality of spraying guns 14 are arranged,
Reference numeral 16 denotes an air blowing portion, reference numeral 18 denotes a water tank, and reference numeral 20 denotes a free roller.
【０００８】熱交換器用アルミニウム偏平管を製造する
場合には、まず、熱間押出成形によってダイス８から押
し出されたアルミニウム（アルミニウム合金を含むもの
とする。）製の偏平管２２の外表面に、Ｚｎ溶射機１２
で溶射ガン１４からＺｎを溶射してＺｎ層を付着させ
る。このとき、押出穴６内におけるビレット４の温度は
４００℃〜５２０℃であり、ダイス８の出口における偏
平管２２の温度は５００℃〜６００℃であることが好ま
しい。また、偏平管２２の断面外形状は、図２に示すよ
うに、幅方向に延びた楕円状とされている。When manufacturing an aluminum flat tube for a heat exchanger, first, Zn is sprayed on the outer surface of an aluminum (including an aluminum alloy) flat tube 22 extruded from a die 8 by hot extrusion. Machine 12
Sprays Zn from the spray gun 14 to deposit a Zn layer. At this time, the temperature of the billet 4 in the extrusion hole 6 is preferably 400 ° C. to 520 ° C., and the temperature of the flat tube 22 at the outlet of the die 8 is preferably 500 ° C. to 600 ° C. The outer shape of the cross section of the flat tube 22 is an ellipse extending in the width direction as shown in FIG.
【０００９】溶射ガン１４は、Ｚｎ線材を液状に溶融さ
せ、エアスプレーによりミスト状に吹き付けるものであ
り、偏平管２２に対する配置態様は、図３に示すよう
に、偏平管２２の上側及び下側にそれぞれ１つずつ配置
された構成とされている。The spray gun 14 melts a Zn wire into a liquid and sprays it in a mist form by air spray. As shown in FIG. Are arranged one by one.
【００１０】また、上記溶射ガン１４によるＺｎ線の溶
射の代わりに、例えば酸素−アセチレン炎をもってＺｎ
粉末を偏平管２２の外表面に吹き付けて、Ｚｎ層を付着
させるようにしてもよい。Further, instead of spraying Zn wire by the spray gun 14, for example, an oxygen-acetylene flame
Powder may be sprayed on the outer surface of the flat tube 22 to adhere the Zn layer.
【００１１】次に、Ｚｎ層の付着された直後のアルミニ
ウム偏平管２２ａを水槽１８中で強制冷却する。なお、
Ｚｎ溶射機１２と水槽１８との間に図１に示すようにエ
アー吹出部１６を設けて偏平管２２ａの下方から上方に
向かってエアーを吹き付け、偏平管２２ａをエアーで支
持するようにしてもよい。水槽１８中においては、下方
に設けられた複数の噴出部１８ａから冷却水をシャワー
状に噴出させて偏平管２２ａに吹き付け、該偏平管２２
ａを急冷する。Next, the aluminum flat tube 22a immediately after the deposition of the Zn layer is forcibly cooled in the water tank 18. In addition,
As shown in FIG. 1, an air blowing portion 16 is provided between the Zn spraying machine 12 and the water tank 18 to blow air upward from below the flat tube 22a to support the flat tube 22a with air. Good. In the water tank 18, cooling water is ejected in a shower form from a plurality of ejection portions 18a provided below and sprayed onto the flat tube 22a.
a is quenched.
【００１２】水槽１８では、偏平管２２ａを３２０℃以
下に冷却する。３２０℃以下まで冷却された場合には、
偏平管２２ｂの表面部のＺｎ層が十分に固化しているた
め、偏平管２２ｂがフリーローラ（回転自在に支持され
たローラ）２０上を通過する際、Ｚｎ層が欠落しない。
また、ローラが回転しないように固定されている場合に
は、偏平管２２ａを２５０℃以下まで冷却することによ
り、Ｚｎ層が欠落しない。従って、このようにローラが
固定されているような場合には、偏平管２２ａを２５０
℃以下まで冷却する。In the water tank 18, the flat tube 22a is cooled to 320 ° C. or lower. When cooled to below 320 ° C,
Since the Zn layer on the surface of the flat tube 22b is sufficiently solidified, the Zn layer does not drop when the flat tube 22b passes over the free roller (roller rotatably supported) 20.
When the roller is fixed so as not to rotate, the Zn layer is not lost by cooling the flat tube 22a to 250 ° C. or less. Therefore, when the roller is fixed as described above, the flat tube 22a is
Cool to below ° C.
【００１３】上記のようにして冷却された偏平管２２ｂ
の外表部に、フィン材をろう付けする等の熱処理を施す
ことにより、Ａｌ層表面部にＺｎ拡散層を形成し、Ａｌ
層とＺｎ層とを完全に密着させることにより熱交換器用
アルミニウム偏平管が製造される。Ａｌ層とＺｎ層との
間のＺｎ拡散層は、この最終的な熱処理時に所要の厚さ
に形成されるため、熱処理後における偏平管のＡｌ層の
肉厚減少が確実に防止され、偏平管の強度低下やクラッ
クの発生が阻止される。The flat tube 22b cooled as described above
By performing a heat treatment such as brazing a fin material on the outer surface of the Al layer, a Zn diffusion layer is formed on the surface of the Al layer.
The aluminum flat tube for a heat exchanger is manufactured by completely bringing the layer and the Zn layer into close contact with each other. Since the Zn diffusion layer between the Al layer and the Zn layer is formed to have a required thickness during the final heat treatment, a decrease in the thickness of the Al layer of the flat tube after the heat treatment is reliably prevented, and the flat tube And the occurrence of cracks is prevented.
【００１４】[0014]
【実施例】次に、本発明の実施例を挙げて効果を実証す
る。図１に示したものと同一の装置構成により、表１に
示す組成のアルミニウム材ビレット（直径１７７mm、長
さ４５０mm）を、５００℃に加熱し、このビレットを押
出速度約４０ｍ／分でダイスから熱間押出成形し、ダイ
ス出口温度が５５０℃となる条件において、押し出され
たアルミニウム偏平管に１５ｇ／ｍ2の割合でＺｎ線を
連続的に溶射し、この偏平管を水槽で３２０℃まで急冷
した。得られた偏平管の断面形状は図２に示す様であ
り、幅２２mm、高さ５mm、管厚０．６mm、隔壁厚０．４
mmであった。また、冷却後の偏平管をフリーローラを介
して搬送する際、偏平管表面部のＺｎ層の欠落は起こら
なかった。EXAMPLES Next, the effects will be demonstrated with reference to examples of the present invention. An aluminum billet (diameter: 177 mm, length: 450 mm) having the composition shown in Table 1 was heated to 500 ° C. by the same apparatus configuration as shown in FIG. 1, and the billet was extruded from a die at an extrusion speed of about 40 m / min. Under the condition that the die exit temperature is 550 ° C., Zn wire is continuously sprayed onto the extruded aluminum flat tube at a rate of 15 g / m 2 , and the flat tube is rapidly cooled to 320 ° C. in a water bath. did. The cross-sectional shape of the obtained flat tube is as shown in FIG. 2, and the width is 22 mm, the height is 5 mm, the tube thickness is 0.6 mm, and the partition wall thickness is 0.4.
mm. Further, when the cooled flat tube was conveyed through the free roller, the Zn layer on the flat tube surface did not drop.
【００１５】[0015]
【表１】 [Table 1]
【００１６】こうして得られた偏平管の外表部に、母材
両面にろう材を被覆したブレージングシートで成形され
たフィンを表２に示す条件でろう付けし、図４に示すよ
うに、偏平管２２の上下両面に、略波形状のフィン材２
３を固着した熱交換器を製造した。得られた熱交換器の
偏平管部分におけるＺｎ拡散層の厚さは５０μｍ〜７０
μｍであり、Ｚｎ拡散層形成後のＡｌ層は十分な厚みと
強度を持っていることが確認された。On the outer surface of the flat tube thus obtained, fins formed of a brazing sheet coated with a brazing material on both surfaces of a base material are brazed under the conditions shown in Table 2, and as shown in FIG. 22 are provided on both upper and lower surfaces of the fin material 2 having a substantially wave shape.
The heat exchanger to which No. 3 was fixed was manufactured. The thickness of the Zn diffusion layer in the flat tube portion of the obtained heat exchanger is 50 μm to 70 μm.
μm, and it was confirmed that the Al layer after the formation of the Zn diffusion layer had a sufficient thickness and strength.
【００１７】[0017]
【表２】 [Table 2]
【００１８】[0018]
【発明の効果】以上説明したように、この発明に係るろ
う付け型熱交換器用アルミニウム偏平管の製造方法によ
れば、Ｚｎ層を付着させたアルミニウム偏平管を３２０
℃以下に強制冷却して十分に固化するので、強制冷却後
のアルミニウム偏平管をローラ等を介して搬送してもＺ
ｎ層が欠落することがなく、取扱い性及び作業性を向上
させて製造コストを低減することができる。また、Ｚｎ
層を付着させたアルミニウム偏平管を３２０℃以下に強
制冷却して十分に固化するので、Ａｌ層の表面部に形成
される拡散層の厚さが必要以上に大きくなることがない
から、熱交換器を組み立てる際のろう付け時の熱処理後
における偏平管のＡｌ層の肉厚減少を防いで偏平管の強
度低下やクラックの発生を防止することができる。As described above, the filter according to the present invention is provided.
According to the method for manufacturing an aluminum flat tube for a brazed heat exchanger, the aluminum flat tube having the Zn
℃ or less and solidifies sufficiently, so that even if the aluminum flat tube after forced cooling is transported through rollers etc.
The n-layer is not lost, and the handling and workability can be improved and the manufacturing cost can be reduced. Also, Zn
Strengthen the flat aluminum tube with the layer attached below 320 ° C
Since it is sufficiently cooled and solidified, the thickness of the diffusion layer formed on the surface of the Al layer does not become unnecessarily large. Therefore, the flatness after the heat treatment at the time of brazing when assembling the heat exchanger. It is possible to prevent a decrease in the thickness of the Al layer of the tube and to prevent a decrease in the strength of the flat tube and the occurrence of cracks.
【図１】本発明方法を実施する態様を示す正面図であ
る。FIG. 1 is a front view showing an embodiment for carrying out the method of the present invention.
【図２】アルミニウム偏平管の断面形状を示す図であ
る。FIG. 2 is a view showing a cross-sectional shape of an aluminum flat tube.
【図３】偏平管に対するＺｎ溶射ガンの配置例を示す図
である。FIG. 3 is a diagram showing an example of an arrangement of a Zn spraying gun with respect to a flat tube.
【図４】熱交換器の部分正面図である。FIG. 4 is a partial front view of the heat exchanger.
１ 押出機 １２ 溶射機 １８ 水槽 ２０ フリーローラ Reference Signs List 1 extruder 12 spraying machine 18 water tank 20 free roller
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平２−220769（ＪＰ，Ａ) 特開 昭61−235072（ＪＰ，Ａ) 特開 平２−85348（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) F28F 19/06 F28F 1/02 B21C 23/00 C21D 9/08 C23C 4/08 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-220769 (JP, A) JP-A-61-235072 (JP, A) JP-A-2-85348 (JP, A) (58) Field (Int.Cl. 7 , DB name) F28F 19/06 F28F 1/02 B21C 23/00 C21D 9/08 C23C 4/08
Claims (3)
の外表面に、Ｚｎ線の溶射法若しくはＺｎ粉末の吹付法
によってＺｎ層を付着させ、この後、Ｚｎ層の付着され
たアルミニウム偏平管を強制冷却によって３２０℃以下
に急冷し、この後にＺｎ層の付着されたアルミニウム偏
平管に熱処理を施し、Ａｌ層表面部に所要の厚さのＺｎ
拡散層を形成してＡｌ層とＺｎ層とを密着させることを
特徴とするろう付け型熱交換器用アルミニウム偏平管の
製造方法。1. A Zn layer is deposited on the outer surface of an aluminum flat tube immediately after hot extrusion by spraying a Zn wire or spraying a Zn powder. The alloy was rapidly cooled to 320 ° C. or lower by forcible cooling, and thereafter, a heat treatment was performed on the aluminum flat tube having the Zn layer attached thereto.
A method for producing an aluminum flat tube for a brazed heat exchanger, comprising forming a diffusion layer and bringing an Al layer and a Zn layer into close contact with each other.
平管の温度は、５００℃〜６００℃であることを特徴と
する請求項１記載の熱交換器用アルミニウム偏平管の製
造方法。2. The method for producing an aluminum flat tube for a heat exchanger according to claim 1, wherein the temperature of the aluminum flat tube immediately after the hot extrusion is from 500 ° C. to 600 ° C.
記アルミニウム偏平管の外表部に、フィン材をろう付け
することにより行うことを特徴とする請求項１又は２記
載の熱交換器用アルミニウム偏平管の製造方法。3. The aluminum for a heat exchanger according to claim 1, wherein the heat treatment is performed by brazing a fin material to an outer surface of the aluminum flat tube to which the Zn layer is adhered. Manufacturing method of flat tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29619592A JP3165265B2 (en) | 1992-11-05 | 1992-11-05 | Manufacturing method of aluminum flat tube for heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29619592A JP3165265B2 (en) | 1992-11-05 | 1992-11-05 | Manufacturing method of aluminum flat tube for heat exchanger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06194092A JPH06194092A (en) | 1994-07-15 |
| JP3165265B2 true JP3165265B2 (en) | 2001-05-14 |
Family
ID=17830410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29619592A Expired - Fee Related JP3165265B2 (en) | 1992-11-05 | 1992-11-05 | Manufacturing method of aluminum flat tube for heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3165265B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7856336B2 (en) | 2008-06-11 | 2010-12-21 | Trimble Navigation Limited | Forward-looking altitude detector |
| US8150651B2 (en) | 2008-06-11 | 2012-04-03 | Trimble Navigation Limited | Acceleration compensated inclinometer |
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| US9157737B2 (en) | 2008-06-11 | 2015-10-13 | Trimble Navigation Limited | Altimeter with calibration |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2009131072A1 (en) * | 2008-04-24 | 2011-08-18 | 三菱電機株式会社 | Heat exchanger and air conditioner using this heat exchanger |
| EP3023728B1 (en) | 2013-10-31 | 2021-03-03 | Mitsubishi Electric Corporation | Corrosion resistance life diagnosis component, heat exchanger, and refrigeration and air conditioning device |
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- 1992-11-05 JP JP29619592A patent/JP3165265B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7856336B2 (en) | 2008-06-11 | 2010-12-21 | Trimble Navigation Limited | Forward-looking altitude detector |
| US8150651B2 (en) | 2008-06-11 | 2012-04-03 | Trimble Navigation Limited | Acceleration compensated inclinometer |
| US8566034B1 (en) | 2008-06-11 | 2013-10-22 | Trimble Navigation Limited | Inclinometer with calibration |
| US9157737B2 (en) | 2008-06-11 | 2015-10-13 | Trimble Navigation Limited | Altimeter with calibration |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06194092A (en) | 1994-07-15 |
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