JP2006214515A - Refrigerant piping connecting joint and method of manufacturing it - Google Patents

Refrigerant piping connecting joint and method of manufacturing it Download PDF

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JP2006214515A
JP2006214515A JP2005028005A JP2005028005A JP2006214515A JP 2006214515 A JP2006214515 A JP 2006214515A JP 2005028005 A JP2005028005 A JP 2005028005A JP 2005028005 A JP2005028005 A JP 2005028005A JP 2006214515 A JP2006214515 A JP 2006214515A
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refrigerant pipe
caulking
refrigerant
fixed block
connection joint
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JP2005028005A
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JP4594122B2 (en
Inventor
Makoto Yoshino
誠 吉野
Hideo Ishida
英男 石田
Yoshihiko Hakozaki
善彦 箱▲崎▼
Jiro Onishi
次郎 大西
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SUN RISE KOGYO KK
Nichirin Co Ltd
Denso Corp
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SUN RISE KOGYO KK
Nichirin Co Ltd
Denso Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact and highly durable refrigerant piping connecting joint capable of maintaining high fatigue strength even when the height of the refrigerant piping connecting joint is lowered, and a method of manufacturing it. <P>SOLUTION: This refrigerant piping connecting joint 1 comprises a fixed block 4 fixed to an object 2 to be connected by a bolt 3, and refrigerant piping 5 inserted into and supported by the fixed block 4. The inner bend radius of the refrigerant piping 5 is set below 3 mm, preferably approximately 0, and the refrigerant piping 5 is bent to have an L shape. An inside bent part 10a of a bent part 10 is stored in the fixed block 4, and a caulking claw 6 of the fixed block 4 is caulked in a straight pipe part 14. The fixed block 4 and the refrigerant piping 5 are fixed, such that a cross section of the outer peripheral face of the caulked portion 7 of the refrigerant piping 5 has a shape in which a ratio of long diameter d<SB>1</SB>to short diameter d<SB>2</SB>is below 1.3, preferably below 1.2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、カーエアコン等の冷媒回路を構成する際に用いられる、機器と冷媒配管とを接続する冷媒配管接続継手に関する。   The present invention relates to a refrigerant pipe joint for connecting a device and a refrigerant pipe, which is used when a refrigerant circuit such as a car air conditioner is configured.

〔従来技術１〕
従来の技術として、図７に示すような冷媒配管継手が提案されている（特許文献１参照）。この冷媒配管接続継手１は、接続対象物２にボルト３で固定される固定ブロック４と、この固定ブロック４に挿通されて支持された冷媒配管５とからなり、冷媒配管５はＬ字形に曲げられている。そして、リングシール部１１と、曲折部１０の少なくとも内側曲部１０ａとが固定ブロック４に収容された状態で、固定ブロック４と冷媒配管５とが固定されている。これにより、固定ブロック４の接続面と冷媒配管５との寸法、つまり冷媒配管接続継手１の高さｈ1が低く設けられるとするものである。 [Prior art 1]
As a conventional technique, a refrigerant pipe joint as shown in FIG. 7 has been proposed (see Patent Document 1). The refrigerant pipe connection joint 1 includes a fixed block 4 fixed to a connection object 2 with bolts 3 and a refrigerant pipe 5 inserted and supported by the fixed block 4. The refrigerant pipe 5 is bent into an L shape. It has been. And the fixed block 4 and the refrigerant | coolant piping 5 are being fixed in the state in which the ring seal part 11 and at least the inner side curved part 10a of the bending part 10 were accommodated in the fixed block 4. FIG. Accordingly, the dimension between the connection surface of the fixed block 4 and the refrigerant pipe 5, that is, the height h 1 of the refrigerant pipe connection joint 1 is set low.

〔従来技術２〕
ところが、上記従来技術１の冷媒配管接続継手１は冷媒配管５の直管部１４側が固定されていないため、振動等による冷媒配管５のガタツキが問題となった。そこで、上記従来技術１の冷媒配管接続継手１を改良したものとして、図８に示すように、固定ブロック４に加締め爪６を設け、この加締め爪６を冷媒配管５の直管部１４に加締めたものが実用化されている。これにより、振動等による冷媒配管５のガタツキをより確実に防止することができるようになった。 [Prior art 2]
However, since the refrigerant pipe connection joint 1 of the prior art 1 is not fixed on the straight pipe portion 14 side of the refrigerant pipe 5, rattling of the refrigerant pipe 5 due to vibration or the like becomes a problem. Therefore, as an improvement of the refrigerant pipe connection joint 1 of the prior art 1, as shown in FIG. 8, a caulking claw 6 is provided in the fixed block 4, and the caulking claw 6 is connected to the straight pipe portion 14 of the refrigerant pipe 5. What has been crimped to is put into practical use. Thereby, the play of the refrigerant pipe 5 due to vibration or the like can be prevented more reliably.

上記従来技術２の冷媒配管接続継手１がエンジンルーム内に設置されたとき、冷媒配管５はコンプレッサからの振動等により繰り返し荷重を受ける。そして、冷媒配管５は加締め爪６で加締められた部位７で固定されているため、特にこの部位７に応力が集中することとなる。  When the refrigerant pipe connection joint 1 of the prior art 2 is installed in the engine room, the refrigerant pipe 5 is repeatedly subjected to a load due to vibration from a compressor or the like. And since the refrigerant | coolant piping 5 is being fixed in the site | part 7 crimped by the crimping nail | claw 6, especially stress will concentrate on this site | part 7. FIG.

そこで、冷媒配管接続継手１の耐久性を評価するため、固定ブロック４を固定して冷媒配管５の直管部１４先端に一定の曲げ荷重を掛けつつ当該先端を冷媒配管５の軸周りに回転させる回転疲労試験を行い、この試験結果から求められた疲労限（疲労強度）が規定値以上のものを冷媒配管接続継手１として採用することが行われている。  Therefore, in order to evaluate the durability of the refrigerant pipe connection joint 1, the fixed block 4 is fixed and a constant bending load is applied to the front end of the straight pipe portion 14 of the refrigerant pipe 5 while rotating the front end around the axis of the refrigerant pipe 5. A rotation fatigue test is performed, and a fatigue pipe (fatigue strength) obtained from the test result is employed as a refrigerant pipe connection joint 1 having a fatigue limit or more.

ところで、近年エンジンルーム内への各種機器の設置がますます過密化しているため、冷媒配管接続継手１の高さｈ1をさらに低くした、よりコンパクトな冷媒配管接続継手の開発が要請されていた。 By the way, since the installation of various devices in the engine room has become increasingly dense in recent years, there has been a demand for the development of a more compact refrigerant pipe connection joint in which the height h 1 of the refrigerant pipe connection joint 1 is further reduced. .

しかるに、冷媒配管接続継手１の高さｈ1を単に低くするだけでは上記疲労強度が低下して規定値を満たさなくなり、上記コンパクト化の要請を満足する冷媒配管接続継手が得られない状況にあった。
特開平７−１２２８３号公報 However, simply reducing the height h 1 of the refrigerant pipe connection joint 1 reduces the fatigue strength and does not satisfy the specified value, so that a refrigerant pipe connection joint that satisfies the demand for compactness cannot be obtained. It was.
Japanese Patent Laid-Open No. 7-12283

そこで、本発明は、冷媒配管接続継手の高さを低くしても疲労強度が高く維持できる、コンパクトでかつ耐久性に優れた冷媒配管接続継手およびその製造方法を提供することを目的とする。  Accordingly, an object of the present invention is to provide a compact and highly durable refrigerant pipe connection joint that can maintain high fatigue strength even if the height of the refrigerant pipe connection joint is lowered, and a method for manufacturing the same.

請求項１に記載の発明は、冷媒が流れる内部通路を備えた接続対象物に、接続具で固定される固定ブロックと、この固定ブロックに挿通された状態で支持された冷媒配管とを備え、前記固定ブロックを前記接続対象物に固定することによって、前記冷媒配管と前記内部通路とが接続される冷媒配管接続継手において、前記冷媒配管は、前記内部通路と接続される側に、内側曲部の曲げ半径が３ｍｍ以下である曲折部を備え、前記固定ブロックは、前記曲折部の内側曲部を収容する曲折収容部を備えるとともに、前記冷媒配管の直管部に加締められる加締め爪を備えた冷媒配管接続継手であって、この加締め爪が加締められた加締め部位における前記冷媒配管の外周面の断面形状が、長径／短径の比で１．３以下であることを特徴とする冷媒配管接続継手である。    The invention according to claim 1 includes a fixed block fixed by a connector and a refrigerant pipe supported in a state of being inserted through the fixed block in a connection object including an internal passage through which the refrigerant flows. In the refrigerant pipe connection joint in which the refrigerant pipe and the internal passage are connected by fixing the fixing block to the connection object, the refrigerant pipe has an inner curved portion on the side connected to the internal passage. A bending portion having a bending radius of 3 mm or less, and the fixing block includes a bending housing portion that houses an inner bending portion of the bending portion, and a crimping claw that is crimped to a straight pipe portion of the refrigerant pipe. A refrigerant pipe connection joint provided, wherein a cross-sectional shape of an outer peripheral surface of the refrigerant pipe at a caulking portion where the caulking claws are caulked is 1.3 or less in a ratio of major axis / minor axis. Refrigerant distribution It is a connection joint.

請求項２に記載の発明は、前記加締め爪が加締められた加締め部位において、前記加締め爪の最上端と前記冷媒配管の最上端とが略一致する高さとなる請求項１に記載の冷媒配管接続継手である。  The invention according to claim 2 is the invention according to claim 1, wherein the uppermost end of the caulking claw and the uppermost end of the refrigerant pipe substantially coincide with each other at the caulking portion where the caulking claw is caulked. This is a refrigerant pipe connection joint.

請求項３に記載の発明は、請求項１または２に記載の冷媒配管接続継手を製造する方法であって、前記加締め爪を前記冷媒配管に加締める際に、前記加締部位となる冷媒配管の内部に、あらかじめ前記冷媒配管の断面形状を保持する断面形状保持部材を挿入してから加締めることを特徴とする冷媒配管接続継手の製造方法である。   Invention of Claim 3 is a method of manufacturing the refrigerant pipe connection joint of Claim 1 or 2, Comprising: When the said caulking claw is caulked to the said refrigerant | coolant piping, the refrigerant | coolant used as the said caulking site | part A method of manufacturing a refrigerant pipe connection joint, wherein a cross-sectional shape holding member that holds the cross-sectional shape of the refrigerant pipe in advance is inserted into the pipe and then crimped.

本発明によれば、加締め爪で固定された部位の冷媒配管の断面形状を過度に扁平化しないことによって、疲労強度を高く維持でき、コンパクトでかつ耐久性に優れた冷媒配管接続継手およびその製造方法を提供することができる。  According to the present invention, by not excessively flattening the cross-sectional shape of the refrigerant pipe fixed at the caulking claw, the fatigue strength can be maintained high, and the refrigerant pipe connection joint that is compact and excellent in durability and its joint A manufacturing method can be provided.

以下、本発明の実施の形態について図面を参照しながら詳細に説明する。  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

〔冷媒配管接続継手の構成〕
図１に実施の形態に係る冷媒配管接続継手を示す。（ａ）は冷媒配管接続継手の側面図、（ｂ）は冷媒配管接続継手の上面図、（ｃ）は（ａ）におけるＡ−Ａ線断面図である。なお、上記図７および図８に示した従来の冷媒配管接続継手と同一の部品および部位には同一の符号を付した。冷媒配管接続継手１は、カーエアコンの冷媒回路を接続する際に用いられるもので、接続対象物としてのエアコン機器２に接続具としてのボルト３によって固定される固定ブロック４と、この固定ブロック４に端部側が挿通された状態で支持される冷媒配管５とからなる。なお、エアコン機器２は、冷媒配管５と連通する内部通路９を備え、固定ブロック４をエアコン機器２に固定することによって、冷媒配管５と内部通路９とが接続される。 [Configuration of refrigerant pipe connection joint]
FIG. 1 shows a refrigerant pipe connection joint according to the embodiment. (A) is a side view of a refrigerant pipe connection joint, (b) is a top view of the refrigerant pipe connection joint, and (c) is a cross-sectional view taken along line AA in (a). In addition, the same code | symbol was attached | subjected to the same components and site | part as the conventional refrigerant | coolant piping connection joint shown in the said FIG. 7 and FIG. The refrigerant pipe connection joint 1 is used when connecting a refrigerant circuit of a car air conditioner. The fixed block 4 is fixed to an air conditioner device 2 as a connection target by a bolt 3 as a connection tool, and the fixed block 4. The refrigerant pipe 5 is supported in a state where the end side is inserted through the refrigerant pipe 5. Note that the air conditioner device 2 includes an internal passage 9 that communicates with the refrigerant pipe 5, and the refrigerant pipe 5 and the internal passage 9 are connected by fixing the fixed block 4 to the air conditioner device 2.

冷媒配管５は、アルミニウム製の管で、内部通路９と接続される側に、内側の曲げ半径が３ｍｍ以下、好ましくは略０のＬ字形に曲げられた曲折部１０を備える。つまり、冷媒配管５は、内部通路９と接続される側が、エルボ形状に形成されている。冷媒配管５は、円環状に凹んだＯリング溝１２を備え、このＯリング溝１２内にはシール用のＯリング１３が装着される。  The refrigerant pipe 5 is an aluminum pipe, and includes a bent portion 10 bent in an L shape having an inner bending radius of 3 mm or less, preferably approximately 0, on the side connected to the internal passage 9. That is, the refrigerant pipe 5 has an elbow shape on the side connected to the internal passage 9. The refrigerant pipe 5 includes an O-ring groove 12 that is recessed in an annular shape, and a sealing O-ring 13 is mounted in the O-ring groove 12.

固定ブロック４は、アルミニウム製のブロック体で、ボルト３を挿通するボルト挿通穴１５を備えるとともに、冷媒配管５の接続端部１９側を挿通する管挿通穴１６を備える。この管挿通穴１６は、冷媒配管５の曲折部１０の内側曲部１０ａを覆う曲折収容部１８が設けられている。さらに、冷媒配管５の直管部１４を両側から挟み込むように加締められた２本の加締め爪６が設けられている。そして、冷媒配管５の内側曲部１０ａが曲折収容部１８に接触し、冷媒配管５の直管部１４が加締め爪６と加締めにより固着したことによって固定ブロック４と冷媒配管５とがガタツキなくより確実に固定される。  The fixed block 4 is a block body made of aluminum and includes a bolt insertion hole 15 through which the bolt 3 is inserted and a pipe insertion hole 16 through which the connection end 19 side of the refrigerant pipe 5 is inserted. The pipe insertion hole 16 is provided with a bent housing portion 18 that covers the inner curved portion 10 a of the bent portion 10 of the refrigerant pipe 5. Further, two crimping claws 6 are provided that are crimped so as to sandwich the straight pipe portion 14 of the refrigerant pipe 5 from both sides. The inner curved portion 10a of the refrigerant pipe 5 comes into contact with the bent housing portion 18, and the straight pipe portion 14 of the refrigerant pipe 5 is fixed by the caulking claw 6 and caulking, whereby the fixed block 4 and the refrigerant pipe 5 are rattled. It is fixed more reliably.

２本の加締め爪６で加締められた加締め部位７における冷媒配管５の外周面の断面形状は、図１（ｃ）に示す長径ｄ1／短径ｄ2の比で１．３以下、好ましくは１．２以下とする。これにより、冷媒配管接続継手１の耐久性を高く維持できる。ここに、長径ｄ1は外周面の断面形状の最大径を意味し、短径ｄ2は外周面の断面形状の最小径を意味する。 The cross-sectional shape of the outer peripheral surface of the refrigerant pipe 5 at the caulking site 7 that is caulked with two caulking claws 6 is 1.3 or less in the ratio of the major axis d 1 / minor axis d 2 shown in FIG. , Preferably 1.2 or less. Thereby, the durability of the refrigerant pipe connection joint 1 can be maintained high. Here, the long diameter d 1 means the maximum diameter of the cross-sectional shape of the outer peripheral surface, and the short diameter d 2 means the minimum diameter of the cross-sectional shape of the outer peripheral surface.

上記のように長径ｄ1／短径ｄ2の比を限定したのは以下の理由による。すなわち、回転疲労試験において冷媒配管５の直管部１４先端が短径ｄ2に沿う方向に曲げられた状態となったときに、加締め部位７の最も直管部１４先端寄りの位置７ａに最大の曲げ応力が発生する。そして、上記長径ｄ1／短径ｄ2の比が大きくなるほど上記最大応力が上昇し、ついには疲労限が規定値より低くなってしまうためである。したがって、上記断面形状はできるだけ真円に近い形状とすることが望ましい。 The reason for limiting the ratio of major axis d 1 / minor axis d 2 as described above is as follows. That is, in the rotation fatigue test, when the tip of the straight pipe portion 14 of the refrigerant pipe 5 is bent in the direction along the short diameter d 2 , the position 7a closest to the tip of the straight pipe portion 14 of the caulking site 7 is reached. Maximum bending stress is generated. This is because the maximum stress increases as the ratio of the major axis d 1 / minor axis d 2 increases, and eventually the fatigue limit becomes lower than the specified value. Therefore, it is desirable that the cross-sectional shape be as close to a perfect circle as possible.

〔冷媒配管接続継手の製造方法〕
次に、上記冷媒配管接続継手１の主要部の製造方法を説明する。まず、押出成形されたアルミニウム製の冷媒配管５の端部近傍を、極小曲率でパイプを曲げ加工する曲げ加工装置（特開平８−３２３４２５号公報参照）を用いて、内側の曲げ半径が略０のＬ字形のエルボ形状に形成する。一方、ボルト挿通穴１５、管挿通穴１６および加締め爪６を有するアルミニウム製の固定ブロック４を押出し材からの切削によって形成する。 [Manufacturing method of refrigerant pipe joint]
Next, a method for manufacturing the main part of the refrigerant pipe connection joint 1 will be described. First, the inner bend radius is substantially 0 using a bending apparatus (see Japanese Patent Laid-Open No. 8-323425) for bending the pipe near the end of the extruded aluminum refrigerant pipe 5 with a minimum curvature. An L-shaped elbow shape is formed. On the other hand, the aluminum fixed block 4 having the bolt insertion hole 15, the tube insertion hole 16, and the caulking claw 6 is formed by cutting from an extruded material.

次に、固定ブロック４の管挿通穴１６内に冷媒配管５の端部を挿通し、曲折収容部１８に内側曲部１０ａを接触させる。そして、冷媒配管５の直管部１４内に断面形状保持部材として冷媒配管５内径よりやや細径の鋼製の中実棒８を、その先端部が加締め部位７まで届くように挿入したのち、対向する１対の加締め爪６の先端部をともに内側に折り曲げるように加締めて、これら対向する１対の加締め爪６で冷媒配管５を包み込むようにして固定する。加締め完了後中実棒８を抜き取る。加締め部位７における冷媒配管５の外周面の断面形状は、以下のようにして適正なものとすることができる。例えば予備実験で加締め爪６の長さ、断面形状保持部材８の断面形状、加締め力等の加締め条件を種々変更して加締めを行って上記長径ｄ1／短径ｄ2の比を測定し、長径ｄ1／短径ｄ2の比で１．３以下、好ましくは１．２以下が得られる加締め条件を求めておき、その条件で加締めることにより、再現性良く適正な断面形状を得ることができる。 Next, the end of the refrigerant pipe 5 is inserted into the tube insertion hole 16 of the fixed block 4, and the inner bent portion 10 a is brought into contact with the bent accommodating portion 18. Then, after inserting the solid steel rod 8 having a diameter slightly smaller than the inner diameter of the refrigerant pipe 5 into the straight pipe portion 14 of the refrigerant pipe 5 so that the tip thereof reaches the caulking site 7. Then, the ends of the opposing pair of caulking claws 6 are caulked so as to be bent inward, and the refrigerant pipe 5 is wrapped and fixed by the opposing pair of caulking claws 6. After the caulking is completed, the solid bar 8 is removed. The cross-sectional shape of the outer peripheral surface of the refrigerant pipe 5 in the caulking part 7 can be made appropriate as follows. For example, in the preliminary experiment, the ratio of the major axis d 1 / minor axis d 2 is changed by variously changing the caulking conditions such as the length of the caulking claw 6, the cross-sectional shape of the cross-sectional shape holding member 8, and the caulking force. The caulking conditions for obtaining a ratio of major axis d 1 / minor axis d 2 of 1.3 or less, and preferably 1.2 or less are obtained, and by caulking under those conditions, proper reproducibility is appropriate. A cross-sectional shape can be obtained.

次に、固定ブロック４から突出した冷媒配管５に、プレス加工により管軸方向に圧縮して円筒状の拡管部１９を形成した後、例えば転造加工等によりＯリング溝１２を形成する。その後、Ｏリング溝１２内にＯリング１３を装着して、冷媒配管接続継手１が完成する。  Next, the cylindrical pipe expansion portion 19 is formed by compressing the refrigerant pipe 5 protruding from the fixed block 4 in the pipe axis direction by pressing, and then the O-ring groove 12 is formed by, for example, rolling. Thereafter, the O-ring 13 is mounted in the O-ring groove 12 to complete the refrigerant pipe connection joint 1.

〔変形例〕
上記実施の形態では、冷媒配管５および固定ブロック４の材質としてアルミニウムを例示したが、アルミニウム合金、銅、黄銅、ステンレスなど他の材質を用いてもよい。また、冷媒配管５と固定ブロック４の材質は必ずしも同じ材質に限られるものではなく、異なる材質としてもよい。また、接続具３としてボルトを例示したが、ネジや嵌め合わせによって係合する係合構造など、他の手段を用いてもよい。また、１対の加締め爪６で冷媒配管を固定する例を示したが、２対以上の加締め爪で固定するようにしてもよい。また、固定ブロック４に１本の冷媒配管５を固定した例を示したが、複数の冷媒配管を固定して、１度の組付によって複数の冷媒通路を接続するように設けてもよい。また、また、固定ブロック４を押出し材からの切削によって形成する例を示したが、プレス冷鍛加工技術によって形成してもよく、アルミニウムのダイカスト技術によって形成してもよい。また、断面形状保持部材８として鋼製の中実棒を例示したが、黄銅、ステンレスなど他の変形しにくい材質からなる中実棒を用いてもよい。冷媒配管接続継手１をカーエアコンの冷媒回路の接続に用いる例を示したが、ルームエアコン、冷凍機の冷媒回路の接続にも用いることができる。したがって、接続対象物２としてエアコン機器を例示したが、冷凍機にも用いることができる。 [Modification]
In the said embodiment, although aluminum was illustrated as a material of the refrigerant | coolant piping 5 and the fixed block 4, you may use other materials, such as aluminum alloy, copper, brass, stainless steel. Moreover, the material of the refrigerant | coolant piping 5 and the fixed block 4 is not necessarily restricted to the same material, It is good also as a different material. Moreover, although the bolt was illustrated as the connection tool 3, you may use other means, such as the engagement structure engaged by a screw and fitting. Moreover, although the example which fixes refrigerant | coolant piping with one pair of crimping claws 6 was shown, you may make it fix with two or more pairs of crimping claws. Moreover, although the example which fixed one refrigerant | coolant piping 5 to the fixed block 4 was shown, you may provide so that a some refrigerant | coolant piping may be fixed and a some refrigerant | coolant channel | path may be connected by one assembly | attachment. Moreover, although the example which forms the fixed block 4 by cutting from an extruded material was shown, it may be formed by a press cold forging technique or may be formed by an aluminum die casting technique. Moreover, although the solid rod made from steel was illustrated as the cross-sectional shape holding member 8, you may use the solid rod which consists of other materials which are hard to deform | transform, such as brass and stainless steel. Although the example which uses the refrigerant | coolant piping connection joint 1 for the connection of the refrigerant circuit of a car air conditioner was shown, it can be used also for the connection of the refrigerant circuit of a room air conditioner and a refrigerator. Therefore, although the air-conditioner apparatus was illustrated as the connection target object 2, it can be used also for a refrigerator.

上記実施の形態で説明した製造方法により冷媒配管接続継手１を製造した。冷媒配管５は、外径１２ｍｍ、肉厚１．７５ｍｍのアルミニウム製パイプの端部から約２１ｍｍの位置を前記曲げ加工装置（株式会社オプトン製）を用いて、内側の曲げ半径が略０のＬ字形のエルボ形状に形成した。固定ブロック４は、押出し材からの切削により、図２に示すような、１個のボルト挿通穴１５、１個の管挿通穴１６および対向する１対（２本）の加締め爪６を有するアルミニウム製のブロック形状に形成した。なお固定ブロック４は、加締め爪の高さｈ2が約１０ｍｍのもの（比較例）と約５ｍｍのもの（実施例）を２種類作製した。 The refrigerant pipe connection joint 1 was manufactured by the manufacturing method described in the above embodiment. Refrigerant piping 5 has an outer bend radius of approximately 0 mm at the position of about 21 mm from the end of an aluminum pipe having an outer diameter of 12 mm and a wall thickness of 1.75 mm, using the bending apparatus (manufactured by Opton Co., Ltd.). It was formed into a letter-shaped elbow shape. The fixing block 4 has one bolt insertion hole 15, one pipe insertion hole 16, and a pair of opposing (two) caulking claws 6 as shown in FIG. 2 by cutting from the extruded material. An aluminum block shape was formed. The fixing block 4 was produced in two types with a caulking claw height h 2 of about 10 mm (comparative example) and about 5 mm (example).

そして、これら２種類の固定ブロック４のそれぞれに冷媒配管５をセットしたのち、この冷媒配管５の直管部１４内に断面形状保持部材８を、その先端部が加締め部位７まで届くように挿入した。断面形状保持部材８としては、図３および図４に示すように、８．５ｍｍ径の中実棒鋼の先端部を一部面取りしたものを用いた。なお、図３は比較例に用いたもの、図４は実施例に用いたものを示す。   Then, after the refrigerant pipe 5 is set in each of these two types of fixed blocks 4, the cross-sectional shape holding member 8 is placed in the straight pipe portion 14 of the refrigerant pipe 5 so that the tip thereof reaches the caulking site 7. Inserted. As the cross-sectional shape holding member 8, as shown in FIGS. 3 and 4, a chamfered end portion of a 8.5 mm diameter solid bar steel was used. 3 shows what was used for the comparative example, and FIG. 4 shows what was used for the example.

その後、加締め装置により、対向する１対の加締め爪６の先端部をともに内側に折り曲げるように加締めて、これら対向する１対の加締め爪６で冷媒配管５を包み込むようにして固定し、加締め完了後断面形状保持部材８を抜き取った。最後に、固定ブロック４から突出した冷媒配管５に、プレス加工により管軸方向に圧縮して円筒状の拡管部１９を形成した後、転造加工によりＯリング溝１２を形成した。   Thereafter, the front ends of the opposing pair of caulking claws 6 are caulked together by a caulking device so that the refrigerant pipe 5 is wrapped with the opposing pair of caulking claws 6 and fixed. Then, after completion of the caulking, the cross-sectional shape holding member 8 was extracted. Lastly, the refrigerant pipe 5 protruding from the fixed block 4 was compressed in the pipe axis direction by pressing to form a cylindrical pipe expanding portion 19, and then the O-ring groove 12 was formed by rolling.

このようにして得られた冷媒配管接続継手１の加締め部位７を管軸に対して垂直に切断し、その断面（図１（ａ）のＡ−Ａ線断面すなわち図１（ｃ）に相当）のマクロ観察を行った。図５に、この断面の様子を示す。（ａ）の比較例では、冷媒配管１の断面形状が楕円状に扁平化しており、その外周面の断面形状は、長径ｄ1／短径ｄ2＝１．４であった。これに対し、（ｂ）の実施例では、冷媒配管１の断面形状は真円に近いおむすび形状をしており、その外周面の断面形状は、長径ｄ1／短径ｄ2＝１．２であった。また、（ｂ）の実施例の場合、冷媒配管５の上端部が両側の加締め爪６の間で露出し、かつその最上端が加締め爪６の上端面（最上端）にほぼ一致する高さになっている。したがって、（ａ）の比較例のように冷媒配管５の全部が両側の加締め爪６で実質的に包囲された形態のものに比べて加締め爪６の高さを低くすることができる。 The caulking part 7 of the refrigerant pipe connection joint 1 obtained in this way is cut perpendicularly to the pipe axis, and the cross section (corresponding to the cross section taken along the line AA in FIG. 1A, that is, FIG. 1C). ) Macro observation. FIG. 5 shows the state of this cross section. In the comparative example of (a), the cross-sectional shape of the refrigerant pipe 1 is flattened into an elliptical shape, and the cross-sectional shape of the outer peripheral surface thereof is major axis d 1 / minor axis d 2 = 1.4. On the other hand, in the embodiment of (b), the cross-sectional shape of the refrigerant pipe 1 is a rice ball shape close to a perfect circle, and the cross-sectional shape of the outer peripheral surface thereof is the major axis d 1 / minor axis d 2 = 1.2. Met. In the embodiment of (b), the upper end of the refrigerant pipe 5 is exposed between the caulking claws 6 on both sides, and the uppermost end thereof substantially coincides with the upper end surface (uppermost end) of the caulking claw 6. It is height. Therefore, the height of the caulking claw 6 can be made lower than that of a configuration in which the entire refrigerant pipe 5 is substantially surrounded by the caulking claws 6 on both sides as in the comparative example (a).

次に、上記冷媒配管接続継手１を回転疲労試験装置で応力振幅を種々変更して回転疲労試験を行った。本実施例における応力振幅とは、回転疲労試験中において冷媒配管５の直管部１４に貼付した歪ゲージで測定した歪の値を、加締め部位７の最も直管部１４先端よりの位置（図１（ａ）および（ｂ）の符号７ａの位置）での曲げ応力に換算した値を意味する。試験結果を表１および図６に示す。

Figure 2006214515
Next, a rotational fatigue test was performed on the refrigerant pipe connection joint 1 with various stress amplitudes changed by a rotational fatigue test apparatus. The stress amplitude in the present embodiment is the strain value measured with a strain gauge attached to the straight pipe portion 14 of the refrigerant pipe 5 during the rotational fatigue test, and the position of the caulking site 7 from the tip of the straight pipe portion 14 ( It means a value converted into a bending stress at the position 7a in FIGS. 1 (a) and 1 (b). The test results are shown in Table 1 and FIG.
Figure 2006214515

表１および図６から明らかなように、冷媒配管接続継手１の疲労限は、比較例では４．０ｋｇｆ／ｍｍ2（３９．２ＭＰａ）以下と低いのに対し、実施例では、上記従来技術２の従来製品とほぼ同等の約５．０ｋｇｆ／ｍｍ2（４９．０ＭＰａ）が得られることがわかった。 As apparent from Table 1 and FIG. 6, the fatigue limit of the refrigerant pipe connection joint 1 is as low as 4.0 kgf / mm 2 (39.2 MPa) or less in the comparative example, whereas in the example, the prior art 2 described above is used. It was found that about 5.0 kgf / mm 2 (49.0 MPa), which is almost the same as the conventional product, was obtained.

実施の形態に係る冷媒配管接続継手の（ａ）側面図、（ｂ）上面図、（ｃ）（ａ）におけるＡ−Ａ線断面図である。It is the (a) side view, (b) top view, (c) sectional view on the AA line in (a) of the refrigerant pipe connection joint concerning an embodiment. 加締め前の固定ブロックの（ａ）側面図、（ｂ）上面図、（ｃ）端面図である。It is (a) side view, (b) top view, (c) end view of the fixed block before caulking. 比較例に用いた断面形状保持部材の（ａ）端面図、（ｂ）側面図である。It is (a) end view of the cross-sectional shape holding member used for the comparative example, (b) It is a side view. 実施例に用いた断面形状保持部材の（ａ）端面図、（ｂ）側面図である。It is (a) end view of the cross-sectional shape holding member used for the Example, (b) It is a side view. 冷媒配管接続継手の加締め部位の横断面図であり、（ａ）は比較例、（ｂ）は実施例である。It is a cross-sectional view of a caulking part of a refrigerant pipe connection joint, (a) is a comparative example, (b) is an example. 回転疲労試験における、応力振幅と破壊に至った回転数との関係を示すグラフ図である。It is a graph which shows the relationship between the stress amplitude and the rotation speed which resulted in destruction in a rotation fatigue test. 従来技術１の冷媒配管接続継手の側面図である。It is a side view of the refrigerant | coolant piping connection joint of the prior art 1. FIG. 従来技術２の冷媒配管接続継手の側面図である。It is a side view of the refrigerant | coolant piping connection joint of the prior art 2. FIG.

符号の説明Explanation of symbols

１…冷媒配管接続継手
２…接続対象物（エアコン機器）
３…接続具（ボルト）
４…固定ブロック
５…冷媒配管
６…加締め爪
７…加締め部位
８…断面形状保持部材（中実棒）
９…内部通路
１０…曲折部
１０ａ…内側曲部
１４…直管部
１８…曲折収容部
１９…拡管部
ｄ1…長径
ｄ2…短径

1 ... Refrigerant piping joint 2 ... Connection object (air conditioner equipment)
3 ... Connector (bolt)
DESCRIPTION OF SYMBOLS 4 ... Fixed block 5 ... Refrigerant piping 6 ... Clamping claw 7 ... Clamping part 8 ... Cross-sectional shape holding member (solid bar)
9 ... internal passageway 10 ... bent portion 10a ... inner curved portion 14 ... straight portion 18 ... bent accommodating portion 19 ... expanded portion d 1 ... diameter d 2 ... minor axis

Claims (3)

冷媒が流れる内部通路を備えた接続対象物に、接続具で固定される固定ブロックと、この固定ブロックに挿通された状態で支持された冷媒配管とを備え、前記固定ブロックを前記接続対象物に固定することによって、前記冷媒配管と前記内部通路とが接続される冷媒配管接続継手において、前記冷媒配管は、前記内部通路と接続される側に、内側曲部の曲げ半径が３ｍｍ以下である曲折部を備え、前記固定ブロックは、前記曲折部の内側曲部を収容する曲折収容部を備えるとともに、前記冷媒配管の直管部に加締められる加締め爪を備えた冷媒配管接続継手であって、
この加締め爪が加締められた加締め部位における前記冷媒配管の外周面の断面形状が、長径／短径の比で１．３以下であることを特徴とする冷媒配管接続継手。 A connection object having an internal passage through which a refrigerant flows is provided with a fixed block fixed by a connection tool and a refrigerant pipe supported in a state of being inserted through the fixed block, and the fixed block is connected to the connection object. In the refrigerant pipe connection joint in which the refrigerant pipe and the internal passage are connected by fixing, the refrigerant pipe is bent on the side connected to the internal passage and the bending radius of the inner curved portion is 3 mm or less. And the fixing block includes a bent housing portion that houses an inner curved portion of the bent portion, and a refrigerant pipe connection joint that includes a crimping claw that is crimped to a straight pipe portion of the refrigerant pipe. ,
A refrigerant pipe connection joint, wherein a cross-sectional shape of an outer peripheral surface of the refrigerant pipe at a caulking portion where the caulking claws are caulked is 1.3 or less in a ratio of major axis / minor axis. 前記加締め爪が加締められた加締め部位において、前記加締め爪の最上端と前記冷媒配管の最上端とが略一致する高さとなる請求項１に記載の冷媒配管接続継手。   2. The refrigerant pipe connection joint according to claim 1, wherein at a caulking portion where the caulking claw is caulked, a height at which an uppermost end of the caulking claw and an uppermost end of the refrigerant pipe substantially coincide with each other. 請求項１または２に記載の冷媒配管接続継手を製造する方法であって、
前記加締め爪を前記冷媒配管に加締める際に、前記加締め部位となる冷媒配管の内部に、あらかじめ前記冷媒配管の断面形状を保持する断面形状保持部材を挿入してから加締めることを特徴とする冷媒配管接続継手の製造方法。

A method for producing the refrigerant pipe connection joint according to claim 1 or 2,
When the caulking claw is caulked to the refrigerant pipe, a cross-sectional shape holding member that holds the cross-sectional shape of the refrigerant pipe is inserted in advance into the refrigerant pipe serving as the caulking site, and then caulked. A method for manufacturing a refrigerant pipe connection joint.

JP2005028005A 2005-02-03 2005-02-03 Refrigerant piping joint and method for manufacturing the same Expired - Fee Related JP4594122B2 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0712283A (en) * 1993-06-21 1995-01-17 Nippondenso Co Ltd Pipe fitting for connection of refrigerant piping
JPH074976U (en) * 1993-06-17 1995-01-24 株式会社ゼクセル Pipe fittings
JP2000154718A (en) * 1998-11-19 2000-06-06 Futaba Industrial Co Ltd Split passage type exhaust pipe and its manufacture
JP2002228077A (en) * 2001-02-06 2002-08-14 Sanden Corp Pipe joint structure

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH074976U (en) * 1993-06-17 1995-01-24 株式会社ゼクセル Pipe fittings
JPH0712283A (en) * 1993-06-21 1995-01-17 Nippondenso Co Ltd Pipe fitting for connection of refrigerant piping
JP2000154718A (en) * 1998-11-19 2000-06-06 Futaba Industrial Co Ltd Split passage type exhaust pipe and its manufacture
JP2002228077A (en) * 2001-02-06 2002-08-14 Sanden Corp Pipe joint structure

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