JPH0222610Y2 - - Google Patents
Info
- Publication number
- JPH0222610Y2 JPH0222610Y2 JP1984045209U JP4520984U JPH0222610Y2 JP H0222610 Y2 JPH0222610 Y2 JP H0222610Y2 JP 1984045209 U JP1984045209 U JP 1984045209U JP 4520984 U JP4520984 U JP 4520984U JP H0222610 Y2 JPH0222610 Y2 JP H0222610Y2
- Authority
- JP
- Japan
- Prior art keywords
- refrigerant
- evaporator
- refrigerant pipe
- pitting
- 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.)
- Expired
Links
- 239000003507 refrigerant Substances 0.000 claims description 39
- 239000010410 layer Substances 0.000 claims description 20
- 239000011701 zinc Substances 0.000 claims description 16
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 15
- 229910052725 zinc Inorganic materials 0.000 claims description 15
- 238000009792 diffusion process Methods 0.000 claims description 10
- 230000002265 prevention Effects 0.000 claims description 9
- 239000011347 resin Substances 0.000 claims description 4
- 229920005989 resin Polymers 0.000 claims description 4
- 238000005219 brazing Methods 0.000 claims description 3
- 239000011247 coating layer Substances 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 description 10
- 230000007797 corrosion Effects 0.000 description 10
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 239000000428 dust Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Description
【考案の詳細な説明】
〔考案の目的〕
（産業上の利用分野）
本考案は、自動車用空気調和装置に組み込まれ
車室内へ吹出される空気を冷却する場合に使用さ
れるエバポレータの改良に関する。[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The present invention relates to the improvement of an evaporator that is incorporated into an automobile air conditioner and is used to cool air blown into a vehicle interior. .
（従来の技術）
自動車用空気調和装置に用いるエバポレータと
しては、第１図に示すように蛇行した偏平な異形
管１の間に帯状で薄い金属板をジグザグに形成し
たコルゲート型の伝熱フイン２，２を挟持したも
のや、或は第２図に示すように、金属板をプレス
成型して皿状としたものを重ね合せて成る液管素
子３，３を多数積層し、各液管素子３，３間に伝
熱フイン２，２を挟持したものが広く使われてい
る。前者を異形管エバポレータE1、後者を積層
型エバポレータE2と称するが、いずれの形式の
エバポレータにおいても、コンプレツサで圧縮さ
れコンデンサで液体化された冷媒を、膨脹弁を介
し蒸発しやすい状態にして入口管５からエバポレ
ータ内に送り込み、異形管１或いは液管素子３
（以下冷媒管Ｈと総称する）内の偏平な冷媒通路
を通る間に周囲の熱を奪つて蒸発させ、気体とな
つた冷媒を出口管６からコンプレツサに戻すよう
にしている。したがつて冷媒管Ｈに挟まれた伝熱
フイン２，２の間に空気を送り込めば、この空気
は上記冷媒の蒸発により、蒸発潜熱を奪われて冷
却された伝熱フイン２，２に触れて冷却され、車
室内の冷房に供することができる。(Prior Art) As shown in FIG. 1, an evaporator used in an automobile air conditioner is a corrugated heat transfer fin 2 in which a strip-shaped thin metal plate is formed in a zigzag pattern between meandering flat irregularly shaped tubes 1. , 2 sandwiched between each other, or as shown in FIG. One in which heat transfer fins 2, 2 are sandwiched between 3, 3 is widely used. The former is called a deformed tube evaporator E 1 and the latter is called a stacked evaporator E 2 . In either type of evaporator, the refrigerant is compressed in a compressor and liquefied in a condenser, and is made to be easily evaporated through an expansion valve. It is fed into the evaporator from the inlet pipe 5, and the irregularly shaped pipe 1 or liquid pipe element 3 is fed into the evaporator.
While passing through the flat refrigerant passage in the refrigerant pipe H (hereinafter collectively referred to as refrigerant pipe H), ambient heat is absorbed and evaporated, and the gaseous refrigerant is returned to the compressor from the outlet pipe 6. Therefore, if air is sent between the heat transfer fins 2, 2 sandwiched between the refrigerant pipes H, this air will be deprived of the latent heat of vaporization by the evaporation of the refrigerant, and will flow into the cooled heat transfer fins 2, 2. It is cooled to the touch and can be used to cool the interior of the vehicle.
かかるエバポレータE1，E2は、車室内に設置
したクーラユニツトのケージング中に設けられて
いるが、このエバポレータE1，E2内を通る空気
の中にはほこり、泥水等が含まれるために、エバ
ポレータE1，E2の空気入口側にこのほこり等が
付着し、この付着物によつて腐蝕が生じる。この
ほこり等の中には、Cl-，SO4 --イオン等が含ま
れているために、これがエバポレータE1，E2の
冷媒管Ｈに付着し、この冷媒管Ｈを腐蝕すると考
えられるが、この冷媒管Ｈの腐蝕環境は出口側よ
りも入口側の方が厳しく、第３図に示すように腐
蝕レベル（腐蝕が生じた部分を砂目で示す）は入
口側の方が大きくなる。 These evaporators E 1 and E 2 are installed in the casing of a cooler unit installed in the vehicle interior, but since the air passing through the evaporators E 1 and E 2 contains dust, muddy water, etc. This dust, etc. adheres to the air inlet side of the evaporators E 1 and E 2 , and corrosion occurs due to this adhered material. Since this dust contains Cl - , SO 4 -- ions, etc., it is thought that this adheres to the refrigerant pipes H of the evaporators E 1 and E 2 and corrodes the refrigerant pipes H. The corrosive environment of this refrigerant pipe H is more severe on the inlet side than on the outlet side, and as shown in FIG. 3, the corrosion level (corrosion areas are indicated by grains) is greater on the inlet side.
（考案が解決しようとする課題）
そこで、従来から空気流入側に塗膜を形成した
もの（実開昭54−119044号公報）とか、冷媒管の
表面に亜鉛拡散層を形成したアルミニウム製熱交
換器（特開昭57−41882号公報）が提案されてい
るが、前者は塗膜のうえに塗膜を形成するため、
製造上面倒で、コスト的にも不利となり、後者は
不必要な個所までも亜鉛拡散層を形成し、これも
コスト的に不利を解消することができないものと
いうことができる。特に上述した公報記載のもの
は、最も保護しなければならない部分のみなら
ず、保護が不必要な所までも保護しているので不
経済となる。(Problem to be solved by the invention) Therefore, conventional heat exchangers have been developed, such as those with a coating film formed on the air inlet side (Japanese Utility Model Application Publication No. 119044/1983), and aluminum heat exchangers with a zinc diffusion layer formed on the surface of the refrigerant pipe. (Japanese Unexamined Patent Publication No. 57-41882) has been proposed, but since the former forms a coating film on top of the coating film,
This method is troublesome in manufacturing and disadvantageous in terms of cost, and in the latter case, the zinc diffusion layer is formed even in unnecessary locations, which also makes it impossible to overcome the disadvantage in terms of cost. In particular, the method described in the above-mentioned publication is uneconomical because it protects not only the parts that most need to be protected but also parts that do not require protection.
本考案は上述した点に鑑みてなされたもので、
冷媒管の保護の必要な部分のみを保護するように
したエバポレータを提供することを目的とする。 This invention was made in view of the above points,
It is an object of the present invention to provide an evaporator that protects only a portion of a refrigerant pipe that requires protection.
（課題を解決するための手段）
上記目的を達成するための本考案は、内部に冷
媒通路を形成した冷媒管と、この冷媒管の間に介
挿した伝熱フインとを炉中ろう付法により互いに
接合してなるエバポレータにおいて、前記冷媒管
のうち空気流入側端部より約20mmまでの範囲のみ
にある冷媒管表面に孔蝕防止層を形成したエバポ
レータである。
(Means for Solving the Problems) The present invention to achieve the above object uses a furnace brazing method to connect a refrigerant pipe having a refrigerant passage therein and a heat transfer fin inserted between the refrigerant pipe. In this evaporator, a pitting prevention layer is formed on the surface of the refrigerant pipes only within a range of about 20 mm from the air inflow side end of the refrigerant pipes.
また、前記孔蝕防止層は亜鉛拡散層又は樹脂コ
ーテイング層よりなるエバポレータである。 Further, the pitting prevention layer is an evaporator made of a zinc diffusion layer or a resin coating layer.
（作 用）
このように構成すると、最も孔蝕が生じる部分
のみが保護され、冷媒管の腐蝕によつて起る冷媒
洩れが防止されることになる。(Function) With this configuration, only the portion where pitting is most likely to occur is protected, and refrigerant leakage caused by corrosion of the refrigerant pipes is prevented.
（実施例）
以下、本考案の一実施例を図面につき詳細に説
明する。(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.
第４図は本考案の一実施例を示す要部斜視図、
第５図は実験結果を示すグラフであり、第１〜３
図に示す部材と同一部材には同一符号を付して説
明は省略する。 FIG. 4 is a perspective view of essential parts showing an embodiment of the present invention;
Figure 5 is a graph showing the experimental results.
The same members as those shown in the figures are given the same reference numerals, and their explanations will be omitted.
このエバポレータは冷媒管Ｈの空気流入側端部
Ｔより約20mmまでの冷媒管表面に孔蝕防止層１
１、例えば、亜鉛拡散層１１ａを形成している。 This evaporator is equipped with a pitting prevention layer 1 on the surface of the refrigerant pipe up to approximately 20 mm from the air inflow side end T of the refrigerant pipe H.
1. For example, a zinc diffusion layer 11a is formed.
ここにおいて、亜鉛拡散層１１ａの幅ｌを約20
mmにしたのは、第５図に示す実験結果より決定さ
れるもので、孔蝕が生じる位置は、冷媒管Ｈの空
気流入側端部Ｔより最大で10mm程度であり、通常
100mmはあるエバポレータの冷媒管Ｈの全域の1/1
０程度の領域内であるが、確実に孔蝕を防止する
ためには安全を見込み約20mmとすることが望まし
い。 Here, the width l of the zinc diffusion layer 11a is approximately 20
mm was determined from the experimental results shown in Figure 5, and the location where pitting occurs is at most 10 mm from the air inflow side end T of the refrigerant pipe H, and normally
100mm is 1/1 of the entire area of the refrigerant pipe H of a certain evaporator.
Although it is within the range of approximately 0 mm, in order to reliably prevent pitting, it is desirable to set it to approximately 20 mm for safety.
前記エバポレータを成形するに当り、冷媒管Ｈ
は、耐蝕チユーブ（例えばJIS規格のA3003号）
を用い、伝熱フインはZn入りの犠牲腐蝕フイン
を用いている。ただし純粋アルミを使用してもよ
い。しかして、前記亜鉛拡散層１１ａを形成する
には、まず冷媒管Ｈ、例えば異形管の場合はチユ
ーブ押出し成形するが、この押出し成形時に金属
亜鉛を溶射し、その金属亜鉛を空気流入側端部Ｔ
より約20mm（好ましくは10mm程度）の範囲に付着
させ、後に伝熱フイン２を異形管に炉中ろう付法
により固着させるときに、この熱を利用して前記
所定領域の亜鉛を拡散させる。すなわち、この所
定領域の冷媒管Ｈ中に亜鉛を浸透させる。このよ
うに亜鉛拡散すると、腐蝕の形態が異なり、穿孔
が冷媒管Ｈの内部に向う孔蝕ではなく表面に沿つ
て腐蝕が進行し、冷媒管Ｈに孔があき、内部の冷
媒が外部に漏洩するのを防止することになる。 When molding the evaporator, the refrigerant pipe H
is a corrosion-resistant tube (e.g. JIS standard No. A3003)
The heat transfer fins are sacrificial corrosion fins containing Zn. However, pure aluminum may also be used. In order to form the zinc diffusion layer 11a, first, the refrigerant pipe H, for example, a tube with an irregular shape, is extruded. During this extrusion, metal zinc is thermally sprayed, and the metal zinc is applied to the air inflow side end. T
This heat is used to diffuse zinc in the predetermined area when the heat transfer fins 2 are later fixed to the irregular tube by furnace brazing. That is, zinc is infiltrated into the refrigerant pipe H in this predetermined area. When zinc is diffused in this way, the form of corrosion is different, and the corrosion progresses along the surface of the refrigerant pipe H instead of the perforation toward the inside of the refrigerant pipe H, creating a hole in the refrigerant pipe H, and the refrigerant inside leaks to the outside. This will prevent you from doing so.
特に、前記約20mmの幅にするのは、第５図より
明らかなように、実験的に求めたもので、空気流
入側端部Ｔより約20mmの範囲（特に０〜10mmの範
囲）に孔蝕する部分が集中し、その以外には生じ
ないことから決定したものである。 In particular, the width of about 20 mm was determined experimentally, as is clear from Figure 5, and the hole is located within a range of about 20 mm (particularly in the range of 0 to 10 mm) from the end T on the air inflow side. This was chosen because the areas that will be eroded are concentrated and will not occur anywhere else.
ただし、上述した亜鉛拡散層１１ａの形成は一
例であり、孔蝕防止層１１であれば良く、例えば
前記亜鉛拡散層１１ａの他に前記所定の幅ｌに樹
脂をコーテイングすることにより形成した樹脂コ
ーテイング層であつてもよい。またこの幅ｌも約
20mmもあれば十分でそれ以上広範囲にする必要は
ない。 However, the above-mentioned formation of the zinc diffusion layer 11a is just an example, and any pitting prevention layer 11 may be used, for example, a resin coating formed by coating the predetermined width l with a resin in addition to the zinc diffusion layer 11a. It may be a layer. Also, this width l is also approximately
20mm is enough and there is no need to make it wider than that.
以上の説明より明らかなように本考案によれ
ば、冷媒管のうち空気流入側端部より約20mmまで
の範囲のみにある冷媒管表面に孔蝕防止層を形成
したため、最も孔蝕が生じる部分のみを保護する
ことができ、これにより、冷媒管の腐蝕によつて
起る冷媒洩れを完全に防止することができる。し
かも、保護が不必要な所には孔蝕防止層を形成し
ないため、コスト的に有利なエバポレータを得る
ことができるという効果を奏する。
As is clear from the above explanation, according to the present invention, a pitting prevention layer is formed on the surface of the refrigerant pipe only within a range of about 20 mm from the air inflow side end, which is the part where pitting occurs most. This makes it possible to completely prevent refrigerant leakage caused by corrosion of refrigerant pipes. Moreover, since the pitting prevention layer is not formed in areas where protection is unnecessary, it is possible to obtain an evaporator that is advantageous in terms of cost.
第１図は異形管エバポレータの全体斜視図、第
２図は積層型エバポレータの要部斜視図、第３図
は異形管に生じた腐蝕の状態を示す概略斜視図、
第４図は本考案の一実施例を示す異形管の要部斜
視図、第５図は孔蝕の実験結果を示すグラフであ
る。
２……伝熱フイン、１１……孔蝕防止層、１１
ａ……亜鉛拡散層、Ｈ……冷媒管、Ｔ……空気流
入側端部。
FIG. 1 is an overall perspective view of an irregularly shaped tube evaporator, FIG. 2 is a perspective view of main parts of a laminated evaporator, and FIG. 3 is a schematic perspective view showing the state of corrosion that has occurred in the irregularly shaped tube.
FIG. 4 is a perspective view of a main part of a deformed pipe showing an embodiment of the present invention, and FIG. 5 is a graph showing experimental results of pitting. 2... Heat transfer fin, 11... Pitting prevention layer, 11
a... Zinc diffusion layer, H... Refrigerant pipe, T... Air inflow side end.
Claims (1)
冷媒管Ｈの間に介挿した伝熱フイン２とを炉中
ろう付法により互いに接合してなるエバポレー
タにおいて、 前記冷媒管Ｈのうち空気流入側端部Ｔより約
20mmまでの範囲のみにある冷媒管表面に孔蝕防
止層１１を形成したエバポレータ。 ２ 前記孔蝕防止層１１は亜鉛拡散層１１ａ又は
樹脂コーテイング層よりなる実用新案登録請求
の範囲第１項に記載のエバポレータ。[Claims for Utility Model Registration] 1. In an evaporator in which a refrigerant pipe H having a refrigerant passage formed therein and a heat transfer fin 2 inserted between the refrigerant pipes H are joined to each other by furnace brazing. , from the air inflow side end T of the refrigerant pipe H.
An evaporator with a pitting prevention layer 11 formed on the surface of the refrigerant tube only within a range of up to 20 mm. 2. The evaporator according to claim 1, wherein the pitting prevention layer 11 comprises a zinc diffusion layer 11a or a resin coating layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4520984U JPS60159973U (en) | 1984-03-30 | 1984-03-30 | Evaporator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4520984U JPS60159973U (en) | 1984-03-30 | 1984-03-30 | Evaporator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60159973U JPS60159973U (en) | 1985-10-24 |
| JPH0222610Y2 true JPH0222610Y2 (en) | 1990-06-19 |
Family
ID=30558506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4520984U Granted JPS60159973U (en) | 1984-03-30 | 1984-03-30 | Evaporator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60159973U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001255098A (en) * | 2000-03-09 | 2001-09-21 | Ishikawajima Harima Heavy Ind Co Ltd | Regenerative air preheater |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56108071A (en) * | 1980-01-30 | 1981-08-27 | Nippon Denso Co | Evaporator |
-
1984
- 1984-03-30 JP JP4520984U patent/JPS60159973U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56108071A (en) * | 1980-01-30 | 1981-08-27 | Nippon Denso Co | Evaporator |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60159973U (en) | 1985-10-24 |
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