JP2013029200A - Pipe joint - Google Patents

Pipe joint Download PDF

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JP2013029200A
JP2013029200A JP2012200368A JP2012200368A JP2013029200A JP 2013029200 A JP2013029200 A JP 2013029200A JP 2012200368 A JP2012200368 A JP 2012200368A JP 2012200368 A JP2012200368 A JP 2012200368A JP 2013029200 A JP2013029200 A JP 2013029200A
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Prior art keywords
cap nut
pipe
pipe joint
peripheral surface
tip
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JP2012200368A
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JP5567633B2 (en
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Jun Fukuyama
潤 福山
Mitsuhiro Washino
光弘 鷲野
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Higashio Mech Co Ltd
Inoac Housing and Construction Materials Co Ltd
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Higashio Mech Co Ltd
Inoac Housing and Construction Materials Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint capable of reliably preventing contact corrosion that occurs between a pipe joint of a copper-based alloy and an Al pipe.SOLUTION: At a tip part of a cap nut 2 of the pipe joint, an annular-shaped insulation ring 40 is attached which corresponds to an outer circumferential surface of a pipe P to be connected. An axis direction hole part of the cap nut 2 is formed with a recessed groove part in the vicinity of a top surface 23 of the cap nut. The insulation ring 40 has a bulging part, a thin wall cylinder wall part, and an outer flange part standing from an outer end of the cylinder wall part to the outer radial direction, and is integrally formed with a rubber material or plastic having insulation properties. The bulging part of the insulation ring 40 is fitted in the recessed groove part, the cylinder wall part covers an inner circumferential surface of an inner flange part in the vicinity of the front end surface 23 of the cap nut, and the outer flange part is configured to cover the front end surface 23 of the cap nut.

Description

本発明は、管継手に関する。   The present invention relates to a pipe joint.

管継手の一種として、フレア継手が広く知られている。一般に、このフレア継手は、図８に示すように、パイプＰの端部にフレア加工部ｆを特別な治具にて塑性加工して形成し、このフレア加工部ｆを、フレア継手本体ｈのテーパ部ａに当てて袋ナットｎにて締付けて、袋ナットｎのテーパ面ｔとフレア継手本体ｈのテーパ部ａにて挟圧し、金属面の相互圧接にて密封性を確保する構成である（例えば特許文献１参照）。   A flare joint is widely known as a kind of pipe joint. Generally, as shown in FIG. 8, this flare joint is formed by plastically processing a flare processing portion f at the end portion of the pipe P with a special jig, and the flare processing portion f is formed on the flare joint main body h. It is configured to be secured to the taper portion a by tightening with a cap nut n, and clamping between the taper surface t of the cap nut n and the taper portion a of the flare joint main body h, and securing the sealing performance by mutual pressure contact between the metal surfaces. (For example, refer to Patent Document 1).

特開２００５−４２８５８号公報Japanese Patent Laid-Open No. 2005-42858

しかしながら、被接続用パイプＰの材質として、Ａｌを用いる場合、継手本体ｈと袋ナットｎが黄銅等のＣｕ系合金であれば、異種金属による接触腐食が発生するという問題がある。
図８に示すように、外部から水（水滴）がフレア加工部ｆの挟圧部位に浸入する構造であるため、パイプＰと継手本体ｈ，袋ナットｎの間で、異種金属による接触腐食が容易に発生する。
また、作業現場にて、被接続パイプＰの端部に、専用工具を使用して、フレア加工部ｆを形成する必要があり、作業能率が悪く、品質のバラツキも生じる。さらに、パイプＰのフレア加工部ｆの小径端縁ｆ1 に亀裂を生じ易く、特に、パイプ材質がＡｌのときにその亀裂発生率が高い。袋ナットｎを締付けた際にパイプＰが減肉して、その結果、密封性の低下や袋ナットｎに緩みを発生し易いという問題もある。 However, when Al is used as the material of the pipe P to be connected, there is a problem that contact corrosion due to dissimilar metals occurs if the joint body h and the cap nut n are a Cu-based alloy such as brass.
As shown in FIG. 8, since water (water droplets) enters the pinched portion of the flared portion f from the outside, contact corrosion due to dissimilar metals occurs between the pipe P, the joint body h, and the cap nut n. It occurs easily.
Moreover, it is necessary to form the flared portion f at the end of the connected pipe P at the work site using a dedicated tool, resulting in poor work efficiency and variations in quality. Further, the small diameter edge f 1 of the flare-processed portion f of the pipe P is likely to crack, and particularly when the pipe material is Al, the crack occurrence rate is high. When the cap nut n is tightened, the pipe P is thinned. As a result, there is a problem that the sealing performance is deteriorated and the cap nut n is liable to be loosened.

そこで、本発明は、このような問題を解決して、Ａｌ製パイプ等を用いても異種金属の接触による腐食を生ずることを防止でき、冷媒配管用として好適な管継手の提供を目的とする。   Therefore, the present invention solves such a problem and can prevent corrosion caused by contact of dissimilar metals even when an Al pipe or the like is used, and an object of the present invention is to provide a pipe joint suitable for refrigerant piping. .

そこで、本発明に係る管継手は、袋ナットを備えた管継手に於て、上記袋ナットの先端部には、被接続用パイプの外周面に対応する円環状絶縁リングが付設されている。
また、上記袋ナットの軸心方向孔部には、袋ナット先端面の近傍に凹溝部が形成され；かつ、上記絶縁リングは、膨出部と、薄肉円筒壁部と、該円筒壁部の外端から外径方向へ起立した外鍔部とを、有すると共に、絶縁性を有するゴム材又はプラスチックをもって、一体形成され；上記絶縁リングの上記膨出部は、上記凹溝部に嵌着され、さらに、上記円筒壁部は袋ナット先端面の近傍の内鍔部の内周面を被覆し、かつ、上記外鍔部は上記袋ナット先端面を被覆するように構成した。
また、上記絶縁リングの膨出部は、被接続用パイプの外周面に密に接触するシール突条部を備えている。
また、上記被接続用パイプはＡｌ管であり、かつ、袋ナットはＣｕ系合金から成っている。 Therefore, in the pipe joint according to the present invention, in the pipe joint provided with the cap nut, an annular insulating ring corresponding to the outer peripheral surface of the pipe to be connected is attached to the tip end portion of the cap nut.
In addition, a concave groove is formed in the axial hole of the cap nut in the vicinity of the tip end surface of the cap nut; and the insulating ring includes a bulging portion, a thin cylindrical wall portion, and a cylindrical wall portion. An outer flange portion erected from the outer end in the outer diameter direction, and integrally formed with an insulating rubber material or plastic; the bulging portion of the insulating ring is fitted into the concave groove portion; Furthermore, the cylindrical wall portion is configured to cover the inner peripheral surface of the inner flange portion near the tip end surface of the cap nut, and the outer flange portion covers the tip end surface of the cap nut.
Further, the bulging portion of the insulating ring is provided with a seal protrusion that comes into close contact with the outer peripheral surface of the pipe to be connected.
The pipe to be connected is an Al pipe and the cap nut is made of a Cu-based alloy.

本発明によれば、被接続用パイプの材質として（比較的安価な）Ａｌを用いることが可能となる。即ち、異種金属の接触による腐食を巧妙に防止できる。   According to the present invention, Al (relatively inexpensive) can be used as the material of the pipe to be connected. That is, it is possible to skillfully prevent corrosion due to contact with different metals.

本発明の実施の一形態を示しパイプ接続完了直前の状態を示した断面図である。It is sectional drawing which showed one Embodiment just before completion of pipe connection which shows one Embodiment of this invention. パイプ接続状態を示す断面図である。It is sectional drawing which shows a pipe connection state. 袋ナットの一例を示す断面図である。It is sectional drawing which shows an example of a cap nut. 袋ナットの要部拡大断面図である。It is a principal part expanded sectional view of a cap nut. ストップリングの一例を示す要部拡大断面図である。It is a principal part expanded sectional view which shows an example of a stop ring. 絶縁リングを示す断面図である。It is sectional drawing which shows an insulating ring. 作用説明を兼ねた要部ユニットの断面図である。It is sectional drawing of the principal part unit which served as operation | movement description. 従来例を示す断面図である。It is sectional drawing which shows a prior art example.

以下、図示の実施の形態に基づき本発明を詳説する。
図１〜図７に示す実施の形態に於て、本発明に係る管継手Ｊは、フレア継手本体１と袋ナット２とストップリング３と耐冷媒シール４を具備し、さらに、被接続用パイプＰの先端には（従来のフレア加工を全く省略して）ストレート状先端部10を有している。 Hereinafter, the present invention will be described in detail based on the illustrated embodiment.
1 to 7, a pipe joint J according to the present invention includes a flare joint body 1, a cap nut 2, a stop ring 3, and a coolant-resistant seal 4, and further, a pipe for connection. The tip of P has a straight tip 10 (without any conventional flaring process).

フレア継手本体１は、従来の継手本体と同様の形状・構成であり（図８のフレア継手本体ｈ参照）、先端縮径テーパ部５を有する。つまり、流路孔６が貫設された接続筒部７の先端に先端縮径テーパ部５が形成される。
また、全体形状は、ストレート状，Ｔ字型，Ｙ字型，十字型等自由であるが、（図１，図２の）図外に存在する他の接続端部の形状は、図１，図２と同様の接続筒部７を有していても、テーパ雄ネジ，平行雌ネジ，溶接用筒部等を有していても、自由である。
要するに、図１，図２に示すような少なくとも１個の接続筒部７を具備し、また、図１，図２の図例では、上記テーパ部５の基端縁に連設した短いストレート部８を介して、平行ネジの雄ネジ部９を、上記接続筒部７が有している。このフレア継手本体１の材質としては、黄銅（真鍮）が（従来から一般的に使用されているので）好適である。 The flare joint main body 1 has the same shape and configuration as a conventional joint main body (see the flare joint main body h in FIG. 8), and has a tip diameter-reduced taper portion 5. That is, the tip diameter-reduced taper portion 5 is formed at the tip of the connecting tube portion 7 through which the flow path hole 6 is provided.
Also, the overall shape is free, such as straight, T-shaped, Y-shaped, and cross-shaped, but the shapes of the other connecting end portions that are outside the figures (FIGS. 1 and 2) are as shown in FIG. Even if it has the connection cylinder part 7 similar to FIG. 2 or has a taper male screw, a parallel female screw, a welding cylinder part, etc., it is free.
In short, at least one connecting tube portion 7 as shown in FIGS. 1 and 2 is provided, and in the example of FIGS. 1 and 2, a short straight portion connected to the base end edge of the taper portion 5. The connecting cylinder part 7 has a male screw part 9 of a parallel screw through 8. As the material of the flare joint body 1, brass (brass) is suitable (since it has been generally used).

袋ナット２は、軸心方向に孔部11が貫設され、この孔部11の基端には、上記雄ネジ部９に螺着される雌ネジ部12を有し、そこから先端に向かって順次、軸心方向に小さな幅寸法Ｗ13のシール溝13、同一径部（ストレート部）14、段付部15、小さな幅寸法Ｗ16の短ストレート部16、先端縮径テーパ部17、（被接続パイプＰの外径よりも僅かに大きい内径寸法の）短ストレート部18、凹溝部19、内鍔部20が、形成される。 The cap nut 2 has a hole portion 11 extending in the axial direction, and has a female screw portion 12 screwed into the male screw portion 9 at the base end of the hole portion 11, and from there toward the tip. sequentially Te, seal groove 13 of smaller width dimension W 13 in the axial direction, the same diameter short straight portion 16 of the (straight portion) 14, stepped portion 15, the small width W 16, tip diameter tapered portion 17, ( A short straight portion 18, a concave groove portion 19, and an inner flange portion 20 (with an inner diameter dimension slightly larger than the outer diameter of the connected pipe P) are formed.

上記孔部11の中間の同一径部（ストレート部）14と段付部15と短ストレート部16とテーパ部17とをもって、ストップリング３を収納（内装）するための収納空間部Ｅを形成する（図１，図２，図３，図４参照）。この袋ナット２の材質は、Ｃ3604等の黄銅（真鍮）とするのが、フレア継手本体１との異種金属接触腐食対策の意味で、好ましい。また、この袋ナット２の外周面形状は、先端側を除いて、横断面六角形に形成し、作業工具にて把持しつつ回転トルクを付与しやすい形状とする。さらに、外周面先端側には、40°〜50°の大きな傾斜角度の先端縮径第１テーパ面21と、10°〜25°の小さな傾斜角度の先端縮径第２テーパ面22を、順次配設して、最先端側外径寸法Ｄ22を、パイプＰの外径寸法に強度が許す範囲で、近づける。即ち、図８の従来例に比較して、袋ナット先端面23の外径寸法は十分に小さく、この先端面23の（軸心方向から見た）円環形状の幅寸法は小さく設定されている。 A storage space E for storing (interior) the stop ring 3 is formed by the same diameter portion (straight portion) 14, the stepped portion 15, the short straight portion 16, and the tapered portion 17 in the middle of the hole portion 11. (See FIGS. 1, 2, 3, and 4). The material of the cap nut 2 is preferably brass (brass) such as C3604 from the standpoint of measures against dissimilar metal contact corrosion with the flare joint body 1. Further, the outer peripheral surface shape of the cap nut 2 is formed in a hexagonal cross section excluding the tip end side, and is formed into a shape that can easily apply a rotational torque while being gripped by a work tool. Further, on the distal end side of the outer peripheral surface, a first tapered surface 21 having a large inclination angle of 40 ° to 50 ° and a second tapered surface 22 having a small inclination angle of 10 ° to 25 ° are sequentially provided. by arranging the cutting edge side outer diameter D 22, to the extent that strength allows the outer diameter of the pipe P, closer. That is, as compared with the conventional example of FIG. 8, the outer diameter dimension of the cap nut front end surface 23 is sufficiently small, and the width dimension of the annular shape (viewed from the axial direction) of the front end surface 23 is set smaller. Yes.

次に、ストップリング３について説明すると、図５、及び、図１，図２，図７に示すように、このストップリング３は、袋ナット２の上述の収納空間部Ｅに、図７から図２の軸心方向範囲を移動可能領域として、内装される。その断面形状は短円筒型であり、外周面が基端から中間位置までが、袋ナット２の孔部11の同一径部（ストレート部）14に摺動可能に嵌合（対応）する基本外径部24と、段付部25を介して先端側に連設された小径部26とを、有する。また、内周面27は、軸心方向中間に基本内径部28を有し、かつ、この基本内径部28の軸心方向中間位置にシール凹溝29が配設され、パイプＰはこの基本内径部28に、図１と図２のように挿入される。シール凹溝29に空調用冷媒に対する耐久性に優れた（ＩＩＲから成る）耐冷媒シール４が嵌着される。   Next, the stop ring 3 will be described. As shown in FIGS. 5, 1, 2, and 7, the stop ring 3 is disposed in the above-described storage space E of the cap nut 2 from FIG. 7. It is equipped with the range of the axial direction of 2 as a movable region. The cross-sectional shape is a short cylinder type, and the outer peripheral surface extends from the base end to the middle position, so that it can be slidably fitted (corresponds) to the same diameter portion (straight portion) 14 of the hole 11 of the cap nut 2 It has a diameter portion 24 and a small diameter portion 26 that is connected to the front end side via a stepped portion 25. Further, the inner peripheral surface 27 has a basic inner diameter portion 28 in the middle in the axial direction, and a seal groove 29 is disposed at an intermediate position in the axial direction of the basic inner diameter portion 28, and the pipe P has the basic inner diameter portion. The part 28 is inserted as shown in FIGS. A coolant-resistant seal 4 (made of IIR) having excellent durability against air conditioning refrigerant is fitted into the seal groove 29.

さらに、基本内径部28の端部（図５の左側）には、段付部30とアール状圧接勾配面32が順次連設した内周面形状に構成されている。図１，図２に示すように、このアール状圧接勾配面32は、フレア継手本体１の先端縮径テーパ部５に圧接（金属面の相互接触）して、密封作用をなす。なお、図例では、アール状圧接勾配面32は、内周面27から、軸心方向基端面33に渡って大きな曲率半径にて描かれる断面形状を呈し、略４半円形の膨出部31を形成している。
言い換えると、このストップリング３は、内周面27と基端面33の角部に大きな曲率半径でアール状面取りを施して、圧接勾配面32としている。なお、図示省略するがこの圧接勾配面32を、傾斜線状（傾斜直線状）とすることも自由である。 Further, the end portion (left side in FIG. 5) of the basic inner diameter portion 28 is configured to have an inner peripheral surface shape in which a stepped portion 30 and a rounded pressure contact gradient surface 32 are successively arranged. As shown in FIGS. 1 and 2, the round pressure-contacting gradient surface 32 is brought into pressure contact with the tip diameter-reduced taper portion 5 of the flare joint body 1 (metal surface is in mutual contact) to form a sealing action. In the illustrated example, the round pressure-contacting gradient surface 32 has a cross-sectional shape drawn with a large radius of curvature from the inner peripheral surface 27 to the axially proximal end surface 33, and has a substantially four semicircular bulging portion 31. Is forming.
In other words, the stop ring 3 is formed as a pressure contact gradient surface 32 by rounding the corners of the inner peripheral surface 27 and the base end surface 33 with a rounded curvature with a large curvature radius. Although not shown in the drawings, the pressure contact gradient surface 32 can be freely formed in an inclined line shape (inclined straight line shape).

上記段付部30は、挿入されるパイプＰの端面34が当接する。
そして、ストップリング３の先端側には、塑性変形可能な薄肉円筒部35と、その先端のパイプ外周面食い込み用爪部36とを一体に有する。
即ち、ストップリング３に於て、その内周面27には、先端側に浅い盗み部37を凹設して、しかも、外周側の小径部26との共働によって、先端の爪部36が、図５と図１の自由状態から、図２に示した食い込み状態に弾性的に縮径可能なように、上記薄肉円筒部35を形成する。なお、爪部36を含んだ薄肉円筒部35には、軸心方向のスリットは全く存在せず、小孔等も存在しない。
爪部36は横断面不等辺三角形として、内方基端方向へ向き、図２のようにパイプＰの外周面に対して、パイプＰの引抜力に対抗して食い込み易い形状とする。 The stepped portion 30 contacts the end surface 34 of the pipe P to be inserted.
A thin cylindrical portion 35 that can be plastically deformed and a pipe outer peripheral surface biting claw portion 36 at the tip thereof are integrally provided on the tip end side of the stop ring 3.
That is, in the stop ring 3, a shallow stealing portion 37 is recessed on the inner peripheral surface 27 on the distal end side, and the claw portion 36 on the distal end is formed by cooperation with the small-diameter portion 26 on the outer peripheral side. The thin cylindrical portion 35 is formed so that the diameter can be elastically reduced from the free state of FIGS. 5 and 1 to the biting state shown in FIG. It should be noted that the thin cylindrical portion 35 including the claw portion 36 has no axial center slit and no small hole or the like.
The claw portion 36 has an unequal triangular shape in cross section and is oriented in the inward proximal direction so that it can easily bite against the outer peripheral surface of the pipe P against the pulling force of the pipe P as shown in FIG.

図１に示すように、パイプＰを挿入して、袋ナット２に小さな回転トルクを与えて雄ネジ部９に対し雌ネジ部12を軽く螺着すると、ストップリング３の小径部26（薄肉円筒部35）の先端が軽く袋ナット２のテーパ部17に接触する。このとき、ストップリング３の段付部25と、袋ナット２の段付部15との間には、軸心方向に所定小寸法Ｇの間隙が存在している。
その後、袋ナット２を螺進してゆくと、図１から図２に示すように、薄肉円筒部35の先端外周角部38がテーパ部17によって強く絞られ―――内径方向へ押圧され―――、爪部36が、パイプＰのストレート状先端部10の外周面10Ａに、食い込む。この食い込みによって、パイプ引抜抵抗力Ｚ（図２参照）を発生する。同時に、この食い込みによって、大気側Ａから（内部の）耐冷媒シール４への酸素流入を阻止する。 As shown in FIG. 1, when the pipe P is inserted, a small rotational torque is applied to the cap nut 2 and the female screw portion 12 is lightly screwed to the male screw portion 9, the small diameter portion 26 (thin cylinder) of the stop ring 3 is obtained. The tip of the portion 35) is lightly in contact with the tapered portion 17 of the cap nut 2. At this time, a gap of a predetermined small dimension G exists in the axial direction between the stepped portion 25 of the stop ring 3 and the stepped portion 15 of the cap nut 2.
Thereafter, when the cap nut 2 is screwed, as shown in FIGS. 1 to 2, the tip outer peripheral corner portion 38 of the thin cylindrical portion 35 is strongly squeezed by the taper portion 17--pressed in the inner diameter direction- --The claw portion 36 bites into the outer peripheral surface 10A of the straight tip portion 10 of the pipe P. This biting generates a pipe pull-out resistance force Z (see FIG. 2). At the same time, this intrusion prevents oxygen from flowing from the atmosphere side A into the (internal) refrigerant-resistant seal 4.

言い換えると、（薄肉円筒部35はスリットも貫孔も無いので、）爪部36がパイプ先端部10の外周面10Ａに食い込むと、ストップリング３の内周面27の軸心中間位置に在る耐冷媒シール４へ空気（酸素）の流入が遮断され、ＩＩＲから成る耐冷媒シール４の長寿命化が図られることとなる。このストップリング３の材質としては、フレア継手本体１の先端縮径テーパ部５の圧接部の密封性向上や塑性変形性を考慮するとＣ3604等の黄銅（真鍮）が好ましい。
さらに、爪部36近傍の外周角部38と、テーパ部17との強い圧接によって、この圧接部位からの酸素の内部への浸入も阻止される。 In other words (when the thin cylindrical portion 35 has neither a slit nor a through hole), when the claw portion 36 bites into the outer peripheral surface 10A of the pipe tip portion 10, it is located at the axial center position of the inner peripheral surface 27 of the stop ring 3. The inflow of air (oxygen) to the refrigerant resistant seal 4 is blocked, and the life of the refrigerant resistant seal 4 made of IIR is extended. As a material of the stop ring 3, brass (brass) such as C3604 is preferable in consideration of improvement in sealing performance of the press contact portion of the reduced diameter tapered portion 5 of the flare joint body 1 and plastic deformation.
Further, due to the strong pressure contact between the outer peripheral corner portion 38 in the vicinity of the claw portion 36 and the taper portion 17, infiltration of oxygen from the pressure contact portion is also prevented.

次に、図６、及び、図１，図２，図７に於て、袋ナット２には円環状絶縁リング40が付設されている。この円環状絶縁リング40は、絶縁性を有するゴム材又はプラスチックから成り、例えば、耐寿命性、耐候性に優れるＥＰＤＭ等のゴムが望ましいと共に、その付設位置は、袋ナット先端部41とする。図６に示すように、横断面が略五角形とした膨出部42と薄肉円筒壁部43と、その円筒壁部43の外端から外径方向に起立した外鍔部44とから、一体形成されている。
上記膨出部42は、（図４に示した）凹溝部19に嵌着され、三角山型のシール突条部45が内径方向に突出状に形成される。このシール突条部45は、パイプＰの外周面に、弾性的圧接力をもって密に接触して、管継手内部への水等の電解質の浸入を防止し、管継手内部に於て異種金属の接触による腐食を確実に防いでいる。 Next, in FIGS. 6, 1, 2, and 7, the cap nut 2 is provided with an annular insulating ring 40. The annular insulating ring 40 is made of an insulating rubber material or plastic. For example, rubber such as EPDM having excellent life resistance and weather resistance is desirable, and its attachment position is a cap nut tip 41. As shown in FIG. 6, the bulging portion 42 having a substantially pentagonal cross section, a thin cylindrical wall portion 43, and an outer flange portion 44 standing in the outer diameter direction from the outer end of the cylindrical wall portion 43 are integrally formed. Has been.
The bulging portion 42 is fitted into the concave groove portion 19 (shown in FIG. 4), and a triangular ridge-shaped seal protrusion 45 is formed in a protruding shape in the inner diameter direction. The seal protrusion 45 is in close contact with the outer peripheral surface of the pipe P with an elastic pressure contact force to prevent infiltration of electrolytes such as water into the pipe joint. Corrosion due to contact is reliably prevented.

また、袋ナット２の内鍔部20の内周面、及び、その外周面（袋ナット先端面23）を、絶縁リング40が、その円筒壁部43と外鍔部44にて包囲する（被覆する）。このようにして、被接続用パイプＰの外周面に対して、絶縁リング40が接触して、黄銅（真鍮）等の袋ナット２とＡｌ等のパイプＰの外周面に直接的に接触することを阻止して、絶縁作用をなして、異種金属接触による腐食を防いでいる。
さらに、外鍔部44の外径寸法Ｄ44は（前述の）袋ナット先端面23の外径寸法Ｄ22よりも僅かに大きく設定するのが望ましい。つまり、水滴が、袋ナット先端面23とパイプ外周面によって形成される隅部にブリッジ状に溜ることを、外鍔部44が確実に防止する。仮に、絶縁リング40が存在しない場合、あるいは、外鍔部44の外径寸法Ｄ44が極端に小さい場合には、上記隅部に水滴等の電解質が（ブリッジ作用で）溜って、異種金属の接触による腐食が発生する虞がある。このような腐食（電蝕）を絶縁リング40が有効に防止する。なお、膨出部42の断面形状は変形自由であって、円形としてもよい（そのときも円弧状シール突条部45が形成される）と共に、シール突条部45が２山以上形成されてもよい。 Further, the inner peripheral surface of the inner flange portion 20 of the cap nut 2 and the outer peripheral surface (cap nut end surface 23) thereof are surrounded by the cylindrical wall portion 43 and the outer flange portion 44 (covering). To do). In this way, the insulating ring 40 comes into contact with the outer peripheral surface of the pipe P to be connected, and directly contacts the cap nut 2 such as brass and the outer peripheral surface of the pipe P such as Al. It prevents the corrosion caused by the contact with different metals.
Further, the outer diameter D 44 of the outer collar portion 44 to set slightly larger than the outer diameter D 22 of (above) the cap nut the distal end surface 23 desirably. That is, the outer flange portion 44 reliably prevents water droplets from collecting in a bridge shape at the corner formed by the cap nut tip surface 23 and the pipe outer peripheral surface. If, when the insulating ring 40 is not present or, if the outer diameter D 44 of the outer flange portion 44 is extremely small, the electrolyte such as water droplets in the corners (the bridge action) accumulated, the different metals Corrosion due to contact may occur. The insulating ring 40 effectively prevents such corrosion (electric corrosion). The cross-sectional shape of the bulging portion 42 is freely deformable and may be circular (the arc-shaped seal ridge 45 is formed at that time), and two or more seal ridges 45 are formed. Also good.

ところで、袋ナット２の雌ネジ部12の隣のシール溝13には、Ｏリング等のシール46が嵌着され、このシール46の材質は冷媒シール性、耐寿命性に優れるＥＰＤＭ等のゴムが好ましく、また、図２の使用（接続）状態でフレア継手本体１のストレート部８に接触して密封作用をなす。
このシール46の機能は２つあり、１つは、図２に示すように、圧接勾配面32とテーパ部５との金属面の相互圧接によるシール作用に対して補助する予備的密封機能であり、他の１つは、図７に示したようにストップリング３の脱落防止機能である。 By the way, a seal 46 such as an O-ring is fitted in the seal groove 13 adjacent to the female threaded portion 12 of the cap nut 2, and the material of the seal 46 is rubber such as EPDM having excellent refrigerant sealing performance and life resistance. Further, in the use (connected) state of FIG. 2, the flare joint body 1 is brought into contact with the straight portion 8 to perform a sealing action.
There are two functions of the seal 46, and one is a preliminary sealing function that assists in the sealing action by the mutual pressure welding of the metal surface of the pressure contact gradient surface 32 and the taper portion 5, as shown in FIG. The other one is a function for preventing the stop ring 3 from falling off as shown in FIG.

後者の機能、及び、その機能と作用を奏するための構成について説明すれば、（図７と図１に示すように、）袋ナット２の孔部11に形成された雌ネジ部12と同一径部14との間（のシール溝13）に、シール46を内装して、かつ、内装状態で該シール46の内径寸法Ｄ46を、ストップリング３の外径寸法ｄよりも小さく設定することで、未使用状態下にてストップリング３が袋ナット２から離脱しないように、シール46の内周端縁にストップリング３の基端面33の角部が引掛かるように保持されて、図７の状態下でも下方へ脱落しない。このように未使用状態（工場取扱中、在庫中、輸送中、配管作業中等）に於て、シール46が不意に離脱することを防ぐ。 The latter function and the structure for performing the function and action will be described. As shown in FIGS. 7 and 1, the same diameter as that of the female screw 12 formed in the hole 11 of the cap nut 2 is described. between the parts 14 (seal groove 13 of), and interior seal 46, and the inner diameter D 46 of the seal 46 are decorated state, by setting smaller than the outer diameter d of the stop ring 3 7 so that the corner of the base end face 33 of the stop ring 3 is hooked on the inner peripheral edge of the seal 46 so that the stop ring 3 does not detach from the cap nut 2 in an unused state. Does not fall down even under conditions. In this manner, the seal 46 is prevented from being unexpectedly detached when not in use (factory handling, inventory, transportation, piping work, etc.).

ところで、本発明に係る管継手は空調の冷媒（ガス）の密封に好適であり、施工も容易で作業性に優れ、従来のようなパイプＰのフレア加工部ｆ（図８参照）の形成作業は全く省略できる。従って、作業者や作業工具による作業のバラツキがなくなり品質が安定する。さらに、専用工具も不要となる。さらに、インコア無しで作業性がさらに向上する。
また、図１の小寸法Ｇが無くなるまで、図２のように、袋ナット２を螺進させると、自動的に、爪部36がパイプＰの外周面に食い込んで引抜抵抗力Ｚを発揮し、同時に、ストップリング３の圧接勾配面32が、フレア継手本体１のテーパ部５に強く金属面相互が圧接して密封作用をなす。しかも、同時にシール46は図１から図２のように僅かに移動して、ストレート部８に於て弾性圧縮されて、圧接勾配面32とテーパ部５の金属面相互圧接によるシール部位に対する副シール（予備シール）の機能をはたす。 By the way, the pipe joint according to the present invention is suitable for sealing air-conditioning refrigerant (gas), is easy to construct, has excellent workability, and has a conventional operation for forming a flare processing portion f (see FIG. 8) of the pipe P. Can be omitted at all. Therefore, there is no variation in work by the worker or work tool, and the quality is stabilized. Furthermore, a dedicated tool is not required. Furthermore, workability is further improved without in-core.
Further, when the cap nut 2 is screwed as shown in FIG. 2 until the small dimension G in FIG. 1 disappears, the claw portion 36 automatically bites into the outer peripheral surface of the pipe P and exhibits the pulling resistance force Z. At the same time, the pressure contact gradient surface 32 of the stop ring 3 is strongly pressed against the taper portion 5 of the flare joint body 1 so that the metal surfaces are pressed against each other to form a sealing action. Further, at the same time, the seal 46 slightly moves as shown in FIGS. 1 and 2, is elastically compressed in the straight portion 8, and is a secondary seal for the seal portion by the pressure contact gradient surface 32 and the metal surface mutual pressure contact of the taper portion 5. Perform the function of (preliminary seal).

耐冷媒シール４は、ＩＩＲ（ブチルゴム）のＯリングが好適であり、冷媒（ガス）の透過性が極めて低く、優れている。しかし、酸化劣化しやすい欠点があるが、これを、爪部36のパイプ外周面への食い込みにて防止できる。また、所望により給水、給湯配管に用いることも可能である。   The refrigerant-resistant seal 4 is preferably an IIR (butyl rubber) O-ring and has an extremely low refrigerant (gas) permeability. However, although there is a defect that is easily oxidized and deteriorated, this can be prevented by biting into the outer peripheral surface of the claw 36. Moreover, it can also be used for water supply and hot water supply piping if desired.

１ フレア継手本体
２ 袋ナット
３ ストップリング
４ 耐冷媒シール
５ 先端縮径テーパ部
９ 雄ネジ部
10 ストレート状先端部
10Ａ 外周面
11 孔部
12 雌ネジ部
14 同一径部
17 テーパ部
19 凹溝部
20 内鍔部
23 袋ナット先端面
29 シール凹溝
32 圧接勾配面
35 薄肉円筒部
36 爪部
40 絶縁リング
41 袋ナット先端部
42 膨出部
43 薄肉円筒壁部
44 外鍔部
45 シール突条部
46 シール（Ｏリング）
Ｐ パイプ
Ｅ 収納空間部 DESCRIPTION OF SYMBOLS 1 Flare fitting main body 2 Cap nut 3 Stop ring 4 Refrigerant-resistant seal 5 Tip diameter-reduction taper part 9 Male thread part
10 Straight tip
10A outer peripheral surface
11 hole
12 Female thread
14 Same diameter part
17 Taper
19 Concave groove
20 Inner buttock
23 Cap nut tip
29 Seal groove
32 Pressure gradient surface
35 Thin cylindrical part
36 Claw
40 Insulation ring
41 Cap nut tip
42 bulge
43 Thin cylindrical wall
44 Outer part
45 Seal ridge
46 Seal (O-ring)
P pipe E Storage space

Claims (4)

袋ナット（２）を備えた管継手に於て、上記袋ナット（２）の先端部（41）には、被接続用パイプ（Ｐ）の外周面に対応する円環状絶縁リング（40）が付設されていることを特徴とする管継手。   In the pipe joint provided with the cap nut (2), an annular insulating ring (40) corresponding to the outer peripheral surface of the pipe (P) to be connected is provided at the tip (41) of the cap nut (2). A pipe joint characterized by being attached. 上記袋ナット（２）の軸心方向孔部（11）には、袋ナット先端面（23）の近傍に凹溝部（19）が形成され、
かつ、上記絶縁リング（40）は、膨出部（42）と、薄肉円筒壁部（43）と、該円筒壁部（43）の外端から外径方向へ起立した外鍔部（44）とを、有すると共に、絶縁性を有するゴム材又はプラスチックをもって、一体形成され、
上記絶縁リング（40）の上記膨出部（42）は、上記凹溝部（19）に嵌着され、さらに、上記円筒壁部（43）は袋ナット先端面（23）の近傍の内鍔部（20）の内周面を被覆し、かつ、上記外鍔部（44）は上記袋ナット先端面（23）を被覆するように構成した請求項１記載の管継手。 A concave groove (19) is formed in the axial hole (11) of the cap nut (2) in the vicinity of the cap nut tip surface (23),
In addition, the insulating ring (40) includes a bulging portion (42), a thin cylindrical wall portion (43), and an outer flange portion (44) rising from the outer end of the cylindrical wall portion (43) in the outer diameter direction. And integrally formed with an insulating rubber material or plastic,
The bulging portion (42) of the insulating ring (40) is fitted into the concave groove portion (19), and the cylindrical wall portion (43) is an inner flange portion in the vicinity of the cap nut tip surface (23). The pipe joint according to claim 1, wherein the inner peripheral surface of (20) is covered and the outer flange portion (44) is configured to cover the cap nut tip surface (23). 上記絶縁リング（40）の膨出部（42）は、被接続用パイプ（Ｐ）の外周面に密に接触するシール突条部（45）を備えている請求項１又は２記載の管継手。   The pipe joint according to claim 1 or 2, wherein the bulging portion (42) of the insulating ring (40) includes a seal protrusion (45) in close contact with the outer peripheral surface of the pipe (P) to be connected. . 上記被接続用パイプ（Ｐ）はＡｌ管であり、かつ、袋ナット（２）はＣｕ系合金から成っている請求項１，２又は３記載の管継手。   The pipe joint according to claim 1, 2, or 3, wherein the pipe for connection (P) is an Al pipe and the cap nut (2) is made of a Cu-based alloy.
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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS48113716U (en) * 1972-03-30 1973-12-26
JPS582487U (en) * 1981-06-30 1983-01-08 住友金属工業株式会社 pipe fittings
JPS6026388U (en) * 1983-07-29 1985-02-22 株式会社　川西水道機器製作所 Union nut with special packing interior
JPS63110788U (en) * 1987-01-09 1988-07-16
JPS6445085U (en) * 1987-09-14 1989-03-17
JPH04171387A (en) * 1990-11-02 1992-06-18 Kubota Corp Rubber ring for vacuum piping
JPH06341580A (en) * 1993-05-31 1994-12-13 Cosmo Koki Kk Connecting structure of water-conveyance device
JP2005291280A (en) * 2004-03-31 2005-10-20 Nissin Kogyo Co Ltd Machine part
JP2008248983A (en) * 2007-03-29 2008-10-16 Kitz Corp Insulating joint and method of assembling the same

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS48113716U (en) * 1972-03-30 1973-12-26
JPS582487U (en) * 1981-06-30 1983-01-08 住友金属工業株式会社 pipe fittings
JPS6026388U (en) * 1983-07-29 1985-02-22 株式会社　川西水道機器製作所 Union nut with special packing interior
JPS63110788U (en) * 1987-01-09 1988-07-16
JPS6445085U (en) * 1987-09-14 1989-03-17
JPH04171387A (en) * 1990-11-02 1992-06-18 Kubota Corp Rubber ring for vacuum piping
JPH06341580A (en) * 1993-05-31 1994-12-13 Cosmo Koki Kk Connecting structure of water-conveyance device
JP2005291280A (en) * 2004-03-31 2005-10-20 Nissin Kogyo Co Ltd Machine part
JP2008248983A (en) * 2007-03-29 2008-10-16 Kitz Corp Insulating joint and method of assembling the same

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