JP4241686B2 - Pipe fitting - Google Patents

Pipe fitting Download PDF

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JP4241686B2
JP4241686B2 JP2005211284A JP2005211284A JP4241686B2 JP 4241686 B2 JP4241686 B2 JP 4241686B2 JP 2005211284 A JP2005211284 A JP 2005211284A JP 2005211284 A JP2005211284 A JP 2005211284A JP 4241686 B2 JP4241686 B2 JP 4241686B2
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ferrule
outer periphery
pipe
receiving portion
pressing step
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JP2006207795A (en
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宏二 竹永
一成 西村
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Inaba Denki Sangyo Co Ltd
JFE Pipe Fitting Mfg Co Ltd
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Inaba Denki Sangyo Co Ltd
JFE Pipe Fitting Mfg Co Ltd
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本発明は、冷熱空調機等の冷媒配管など金属製接続管の接続に用いられる管継手に関する。   The present invention relates to a pipe joint used for connecting a metal connecting pipe such as a refrigerant pipe for a cold air conditioner or the like.

この種の管継手として、例えば、図４に示すように、筒状の継手本体２１と、この継手本体２１に螺合される締付ナット２２と、継手本体２１に挿入された金属製の接続管Ｐを囲むような筒状をなすとともに、接続管Ｐの挿入方向に沿って並ぶように配された二つ以上の金属製の締付リング（フェルール）２３，２４と、接続管挿入方向に対して傾斜したテーパ面２５，２６，２７，２８を有し、締付ナット２２の螺進に伴って締付リング２３，２４を縮径方向へ押圧する縮径手段とを備え、この縮径手段により押圧された前記締付リング２３，２４が、塑性変形しつつ縮径することで、接続管Ｐの外周に対し遊動規制状態に食込み及び／又は水密状態に密着する形態で締め付ける構成としたものがある（例えば、特許文献１参照。）。   As this type of pipe joint, for example, as shown in FIG. 4, a tubular joint body 21, a tightening nut 22 screwed into the joint body 21, and a metal connection inserted in the joint body 21 Two or more metal tightening rings (ferrules) 23 and 24 arranged in a cylindrical shape surrounding the pipe P and arranged along the insertion direction of the connection pipe P, and in the connection pipe insertion direction A diameter-reducing means that has tapered surfaces 25, 26, 27, and 28 that are inclined with respect to each other, and that presses the tightening rings 23 and 24 in the diameter-reducing direction as the tightening nut 22 is screwed. The tightening rings 23, 24 pressed by the means are configured to be tightened in a form in which they are bitten in a loosely controlled state and / or in a watertight state with respect to the outer periphery of the connection pipe P by being reduced in diameter while being plastically deformed. There are some (for example, refer to Patent Document 1).

特開２００３−２３２４７４号公報JP 2003-232474 A

しかるに、上記管継手では、バーナを使用するロウ付け接着に代わるものとして有用である反面、締付リング２３，２４を接続管挿入方向に複数個前後に並べ、締付ナット２２の締め付け時に該締付ナット２２が後ろ側の締付リング２４との接触面間で滑り易くすることで接続管Ｐが共回りするのを防止しているが、締付リング２３，２４の部品点数並びに組付け工数が多くなり、コスト高になるという課題を有している。   However, the above pipe joint is useful as an alternative to brazing adhesion using a burner, but on the other hand, a plurality of fastening rings 23 and 24 are arranged in the connecting pipe insertion direction, and the fastening nut 22 is tightened when tightening. The connecting pipe P is prevented from co-rotating by making the attached nut 22 slip easily between the contact surfaces with the rear side tightening ring 24, but the number of parts of the tightening rings 23 and 24 and the assembling man-hours are prevented. However, there is a problem that the cost increases.

本発明の目的は、このような問題を解決するためになされたもので、上記のようなフェルールを用いる形態の管継手においてフェルールをひとつ用いるだけで接続管の抜止め、シール性を確保でき、また共回り防止を図れる管継手を提供することにある。   The object of the present invention was made to solve such a problem, and it is possible to ensure the connection pipe retaining and sealing performance by using only one ferrule in a pipe joint in a form using the ferrule as described above. Another object is to provide a pipe joint that can prevent co-rotation.

本発明の管継手は、金属製の接続管の一端部が差し込まれる受口部を有する継手本体と、この継手本体の前記受口部の外周に設けた雄ねじにねじ込み結合されかつ前記接続管の外周に遊嵌される締付ナットと、前記継手本体の受口部の内部に配され、前記接続管の外周に嵌合する円筒形状のフェルールと、を備えており、前記受口部の内周に、前記フェルールの先端側部の当接により該先端部に縮径作用を加える第１のテーパ面が軸方向外方に向かって漸次拡がり状に形成されており、前記締付ナットの内周に、前記雄ねじに螺合する雌ねじと、この雌ねじの軸方向外端側に設けられるフェルール押圧段部とが形成され、前記フェルール押圧段部が前記締付ナットの螺進に伴って前記フェルールの後端部を軸方向内方へ押し込むことで該フェルールの先端側部が前記第１のテーパ面と前記接続管外周との隙間に食い込んで前記接続管外周と前記第１のテーパ面に気密状態に密着するようにしてあり、前記フェルールの後端部の断面形状は、断面円形に形成してその円周一部が前記フェルール押圧段部に対し線状接触し、その円周他部が前記接続管の外周に当接するようにすること、または、少なくともフェルール押圧段部に線状接触する頂点と、接続管の外周に当接する頂点とを有する多角形に形成することに特徴を有するものである。 The pipe joint of the present invention is a joint main body having a receiving part into which one end of a metal connecting pipe is inserted, and a male screw provided on the outer periphery of the receiving part of the joint main body. A clamping nut loosely fitted on the outer periphery, and a cylindrical ferrule that is disposed inside the receiving portion of the joint body and fits on the outer periphery of the connection pipe. A first taper surface is formed on the circumference so as to gradually expand outward in the axial direction by applying a diameter-reducing action to the tip portion by contact with the tip side portion of the ferrule. A female screw threadedly engaged with the male screw and a ferrule pressing step portion provided on an axially outer end side of the female screw are formed on the circumference, and the ferrule pressing step portion is moved along with the screwing of the tightening nut. By pushing the rear end of the Distal end portion of Lumpur Yes so as to close contact in an airtight state to the first tapered surface and the connecting pipe periphery bite into the gap between the connecting pipe periphery and the first tapered surface, after the ferrule The cross-sectional shape of the end is formed in a circular cross-section and a part of the circumference thereof is in linear contact with the ferrule pressing step part, and the other part of the circumference is in contact with the outer periphery of the connection pipe, or In addition, it is characterized in that it is formed into a polygon having at least a vertex that makes linear contact with the ferrule pressing step and a vertex that makes contact with the outer periphery of the connecting pipe .

一つの好適な態様として、本発明による管継手は、前記受口部の軸方向外側開口端の内周に、前記フェルールの後端部の当接により該後端部に縮径作用を加える第２のテーパ面を軸方向外方に向かって漸次拡がり状に形成することができる。また、前記フェルールの先端側部の外周は先窄まり状のテーパ面に形成することができる。 As a preferred aspect, the pipe joint according to the present invention is configured to apply a diameter reducing action to the rear end portion of the inner periphery of the axially outer opening end of the receiving portion by contact of the rear end portion of the ferrule. 2 taper surfaces can be formed so as to gradually expand outward in the axial direction . Further, the outer periphery of the tip side portion of the ferrule can be formed in a tapered shape with a tapered shape.

また、前記雄ねじ及び／又は雌ねじには減摩層を形成することができる。前記フェルール押圧段部にも減摩層を形成することができる。前記減摩層としては塗料タイプの二硫化モリブデンを焼付塗装することで形成することができる。   Further, an anti-friction layer can be formed on the male screw and / or the female screw. An antifriction layer can also be formed on the ferrule pressing step. The anti-friction layer can be formed by baking paint-type molybdenum disulfide.

上記構成の管継手によれば、締付ナットを継手本体に締め付けることによりフェルール押圧段部がフェルールの後端部を軸方向内方へ押し込んで該フェルールの先端側部が第１のテーパ面と接続管外周との隙間に食い込むようにしてあり、この食い込みにより接続管が継手本体から抜け止めされる状態に接続される。また、フェルールが継手本体の第１のテーパ面と接続管の外周との隙間に食い込んで接続管の外周と第１のテーパ面にそれぞれ気密状に密着するようにしてあるため継手本体と接続管の隙間がシールされる。   According to the pipe joint having the above-described configuration, the ferrule pressing step portion pushes the rear end portion of the ferrule inward in the axial direction by tightening the tightening nut to the joint main body, and the front end side portion of the ferrule becomes the first tapered surface. It is designed to bite into the gap with the outer periphery of the connecting pipe, and the connecting pipe is connected in such a way that the connecting pipe is prevented from coming off from the joint body. In addition, since the ferrule bites into the gap between the first tapered surface of the joint body and the outer periphery of the connecting pipe so as to tightly adhere to the outer periphery of the connecting pipe and the first tapered surface, respectively, the joint body and the connecting pipe The gap is sealed.

とくに、締付ナットのフェルール押圧段部はフェルールの後端部に対し線状接触させて滑り易くすることで締付ナットの回転力をフェルールに伝わりにくくしてあるので、締付ナットの締め付け時に接続管が共回りするのを防止できる。このように、単一のフェルールを用いる形態の管継手でもって接続管の共回りを防止できるとともに、シール性、抜止め性に優れるものが得られるという利点がある。   In particular, the ferrule pressing step of the tightening nut is made in a linear contact with the rear end of the ferrule to make it slippery, making it difficult to transmit the rotational force of the tightening nut to the ferrule. It is possible to prevent the connecting pipes from rotating together. As described above, there is an advantage that a joint having a form using a single ferrule can prevent joint pipes from rotating together and can provide a seal having excellent sealing performance.

受口部の軸方向外側開口端の内周に、フェルールの後端部と当接して該後端部を径方向内方に押圧した縮径させる方向の力を作用させる第２のテーパ面を軸方向外方に向かって漸次拡がり状に形成しておくと、締付ナットの螺進に伴いフェルールの先端側部が第１のテーパ面と接続管の外周との隙間に楔状に食い込み終える直前にフェルールの後端部が第２のテーパ面により径方向内方に押圧されて縮径変形を加えられながら接続管の外周に気密状態に密着するシール状態が得られ、前記フェルールの先端側部によるシールと共に二重シールされる状態が得られる。   A second taper surface is applied to the inner periphery of the axially outer opening end of the receiving portion to contact the rear end portion of the ferrule and press the rear end portion radially inward to reduce the diameter. If it is formed so as to gradually expand outward in the axial direction, immediately before the tip side of the ferrule bites into the gap between the first taper surface and the outer periphery of the connecting pipe as the tightening nut is screwed. The rear end of the ferrule is pressed radially inward by the second taper surface, and a sealed state is obtained in which the outer periphery of the connection pipe is tightly adhered to the outer periphery of the connecting pipe while being reduced in diameter. A state of being double-sealed together with the seal by is obtained.

継手本体の雄ねじ及び／又は締付ナットの雌ねじに減摩層を形成しておくと、締付ナットを締め付けるとき雌ねじと雄ねじの接触面間での摩擦を低減できるため、小さい操作力で締付ナットを回すことができ、そのときに使う工具も柄の短いスパナ等でも容易に締付ナットを回すことができて作業性に優れる。
締付ナットのフェルール押圧段部にも減摩層を形成しておくと、フェルール押圧段部はフェルールの後端部に対し線状接触させることと相俟って更に滑り易くなって締付ナットの回転力がフェルールに伝わりにくくなり、締付ナットの締め付け時に接続管が共回りするのを確実に防止できる。 If a friction-reducing layer is formed on the male thread of the joint body and / or the female thread of the tightening nut, the friction between the contact surface of the female thread and the male thread can be reduced when tightening the tightening nut. The nut can be turned, and even if the tool used at that time is a short spanner or the like, the tightening nut can be easily turned, and the workability is excellent.
If the anti-friction layer is also formed on the ferrule pressing step portion of the tightening nut, the ferrule pressing step portion becomes more slippery in combination with the linear contact with the rear end portion of the ferrule. This makes it difficult to transmit the rotational force to the ferrule and reliably prevents the connecting pipe from rotating together when the tightening nut is tightened.

本発明の好適な実施例を図面に基づき説明する。図１は本発明の一実施例を示す管継手の半欠截断面図、図２は図１の管継手に組み込まれるフェルールの断面図である。図１において、本発明に係る管継手は、継手本体１、締付ナット２、単一のフェルール３により構成される。この管継手により接続される接続管Ｐは銅管やステンレス管等からなる。   A preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a half joint of a pipe joint showing an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a ferrule incorporated in the pipe joint of FIG. In FIG. 1, the pipe joint according to the present invention includes a joint body 1, a tightening nut 2, and a single ferrule 3. The connecting pipe P connected by this pipe joint is made of a copper pipe, a stainless steel pipe or the like.

図１に示すように、継手本体１は筒状に形成され、これの少なくとも一端部に接続管Ｐの一端部が差し込まれる受口部４を開口する。この受口部４の内周に、その軸方向内側から外側に向かって順に、環状の管端ストッパー部５と、この管端ストッパー部５の軸方向外側部から軸方向外方へ真直ぐに形成される第１のストレート面６と、この第１のストレート面６の軸方向外側端から軸方向外方に向かって漸次拡がりに形成される第１のテーパ面７と、この第１のテーパ面７の軸方外方端に連続して軸方向外方へ真直ぐにかつ前記第１のストレート面６より大きい内径に形成される第２のストレート面８と、受口部４の軸方向外側開口端の内周であって第２のストレート面８の軸方向外側端から軸方向外方に向かって漸次拡がりに形成される第２のテーパ面９とが備えられている。第２のテーパ面９の傾斜角度は第１のテーパ面７よりも大きく設定されている。継手本体１の外周における軸方向中間位置にはスパナ等工具が掛けられる多角形の工具受け部１０が張り出し形成され、受口部７の外周に対応する位置には雄ねじ１１が形成されている。   As shown in FIG. 1, the joint body 1 is formed in a cylindrical shape, and opens a receiving portion 4 into which one end portion of the connection pipe P is inserted at least one end portion thereof. On the inner periphery of the receiving portion 4, an annular tube end stopper portion 5 and an axially outer portion of the tube end stopper portion 5 are formed straight from the axially inner side to the outer side. A first straight surface 6 that is formed, a first tapered surface 7 that is formed so as to gradually expand outward from the axially outer end of the first straight surface 6, and the first tapered surface A second straight surface 8 that is continuous with the axially outer end of the shaft 7 and that has an inner diameter larger than that of the first straight surface 6, and an axially outer opening of the receiving portion 4. There is provided a second tapered surface 9 which is formed at the inner periphery of the end and gradually expands from the outer end in the axial direction of the second straight surface 8 toward the outer side in the axial direction. The inclination angle of the second tapered surface 9 is set larger than that of the first tapered surface 7. A polygonal tool receiving portion 10 on which a tool such as a spanner is hung is formed at an intermediate position in the axial direction on the outer periphery of the joint body 1, and a male screw 11 is formed at a position corresponding to the outer periphery of the receiving portion 7.

一方、締付ナット２は、これの内周に継手本体１の雄ねじ１１に螺合する雌ねじ１２と、この雌ねじ１２の軸方向外端側に軸心と直交するよう径方向内方に向けて設けられるフェルール押圧段部１３と、このフェルール押圧段部１３の内径部から軸方向外方へ真直ぐに形成されるストレート面１４とが備えられている。   On the other hand, the tightening nut 2 has a female screw 12 that is screwed onto the male thread 11 of the joint body 1 on the inner periphery thereof, and is directed radially inward so as to be orthogonal to the axial center on the axially outer end side of the female screw 12. A ferrule pressing step portion 13 is provided, and a straight surface 14 is formed straight from the inner diameter portion of the ferrule pressing step portion 13 outward in the axial direction.

締付ナット２の雌ねじ１２及び継手本体１の雄ねじ１１の両方、またはそのいずれか一方には減摩層１６が形成される。減摩層１６としては、有機又は無機のバインダー中に二硫化モリブデン粉末を分散させた塗料タイプの減摩材を前記所定箇所に焼付塗装することにより形成することができる。減摩層１６は、そのほかに、フッ素樹脂等の減摩材を塗装したり、あるいはクロムめっきを施したりすることによっても形成することができる。
また、このような減摩層１６は締付ナット２のフェルール押圧段部１３にも形成される。 An antifriction layer 16 is formed on either or both of the internal thread 12 of the tightening nut 2 and the external thread 11 of the joint body 1. The antifriction layer 16 can be formed by baking and painting a paint type antifriction material in which molybdenum disulfide powder is dispersed in an organic or inorganic binder. In addition, the anti-friction layer 16 can also be formed by coating an anti-friction material such as a fluororesin or by applying chrome plating.
Such an antifriction layer 16 is also formed on the ferrule pressing step 13 of the tightening nut 2.

フェルール３は、図２に示すように、継手本体１の第２のストレート面８の内径より少し小さい外径寸法を有し、かつ接続管Ｐの外径よりも少し大きい内径寸法を有する円筒形状に形成される。フェルール３の先端側部３ａの外周は先窄まり状のテーパ面１５に形成され、後端部３ｂは断面円形に形成されている。このフェルール３は真鍮やステンレスなど金属製であって、ステンレス製のフェルール３は銅管又はステンレス管からなる接続管Ｐに対応でき、真鍮製のフェルール３は銅管からなる接続管Ｐに対応できる。   As shown in FIG. 2, the ferrule 3 has a cylindrical shape having an outer diameter dimension slightly smaller than the inner diameter of the second straight surface 8 of the joint body 1 and an inner diameter dimension slightly larger than the outer diameter of the connecting pipe P. Formed. The outer periphery of the front end portion 3a of the ferrule 3 is formed as a tapered tapered surface 15, and the rear end portion 3b is formed in a circular cross section. The ferrule 3 is made of metal such as brass or stainless steel. The stainless steel ferrule 3 can correspond to a connection pipe P made of a copper tube or a stainless steel pipe, and the brass ferrule 3 can correspond to a connection pipe P made of a copper tube. .

次に、接続管Ｐを接続するひとつの要領について説明する。予め、図１における右半分に示すように、継手本体１の受口部４内にフェルール３をこれの先端側部３ａから挿入するとともに、締付ナット２の雌ねじ１２を継手本体１の雄ねじ１１に螺合させて仮組みする。その際、フェルール３の先端側部３ａの外周に先窄まり状のテーパ面１５を形成しているので、受口部４内から第１のテーパ面７に亘って挿入し易い。この仮組み状態では、フェルール３は先端側部３ａの最先端を継手本体１の第１のテーパ面７に当接するとともに、後端部３ｂを受口部４から後方外部へ突出する。また締付ナット２のフェルール押圧段部１３がフェルール３の断面円形の後端部３ｂの円周一部に線接触状態に当接する。締付ナット２の先端面２ａは継手本体１の工具掛け部１０の一側端面１０ａよりも後方に離間した位置にある。   Next, one point for connecting the connecting pipe P will be described. As shown in the right half in FIG. 1, the ferrule 3 is inserted into the receiving portion 4 of the joint body 1 from the tip side portion 3 a in advance, and the female screw 12 of the tightening nut 2 is inserted into the male screw 11 of the joint body 1. Screw together to temporarily assemble. At that time, since the tapered surface 15 is tapered on the outer periphery of the distal end side portion 3 a of the ferrule 3, it can be easily inserted from the inside of the receiving portion 4 to the first tapered surface 7. In this temporarily assembled state, the ferrule 3 abuts the foremost end of the front end side portion 3a on the first tapered surface 7 of the joint body 1 and projects the rear end portion 3b from the receiving portion 4 to the rear outside. Further, the ferrule pressing step portion 13 of the tightening nut 2 comes into contact with a part of the circumference of the rear end portion 3 b of the circular cross section of the ferrule 3 in a line contact state. The front end surface 2 a of the tightening nut 2 is located at a position separated rearward from the one end surface 10 a of the tool hook 10 of the joint body 1.

次いで、このように仮組みした管継手において、接続管Ｐの一端部を締付ナット２から継手本体１の受口部４内に差し込むが、このとき接続管Ｐの一端部が締付ナット２、フェルール３、第１のストレート面６を順に通過して管端ストッパー部８に当たるまで差し込む。しかる後、継手本体１の工具受け部１０にスパナ等工具を掛けて該継手本体１を回り止め状態にしたうえで、締付ナット２をスパナ等工具で締付け方向に回転させると、同図における左半分に示すように締付ナット２はこれの先端面２ａが工具掛け部１０の一側端面１０ａに当接すると同時にフェルール押圧段部１３が受口部４の外側端面４ａに当接するまで螺進する。その際、継手本体１の雄ねじ１１及び／又は締付ナット２の雌ねじ１２に減摩層１６を形成しているので、それら雌ねじ１２と雄ねじ１１の接触面間での摩擦を低減でき、柄の短いスパナ等でも小さい操作力で容易に締付ナット２を回すことができて作業性に優れる。   Next, in the pipe joint temporarily assembled in this way, one end portion of the connection pipe P is inserted into the receiving portion 4 of the joint body 1 from the tightening nut 2. At this time, one end portion of the connection pipe P is inserted into the tightening nut 2. Then, the ferrule 3 and the first straight surface 6 are inserted in order until they hit the pipe end stopper portion 8. After that, when a tool such as a spanner is put on the tool receiving portion 10 of the joint body 1 to keep the joint body 1 in a non-rotating state, the tightening nut 2 is rotated in the tightening direction with a tool such as a spanner. As shown in the left half, the tightening nut 2 is screwed until the tip end surface 2a thereof contacts the one end surface 10a of the tool hook 10 and the ferrule pressing step 13 contacts the outer end surface 4a of the receiving portion 4 at the same time. Advance. At this time, since the anti-friction layer 16 is formed on the male screw 11 of the joint body 1 and / or the female screw 12 of the tightening nut 2, friction between the contact surfaces of the female screw 12 and the male screw 11 can be reduced. Even with a short spanner or the like, the tightening nut 2 can be easily turned with a small operating force, and the workability is excellent.

この締付ナット２の螺進に伴い、フェルール押圧段部１３によりフェルール３の後端部３ｂが軸方向内方へ押し込まれることで、該フェルール３が軸方向内方へ推進され、該フェルール３の先端側部３ａが第１のテーパ面７により径方向内方に押圧されて縮径変形を加えられながら第１のテーパ面７と接続管Ｐの外周との隙間に楔状に食い込んで行って接続管Ｐの外周と第１のテーパ面７にそれぞれ気密状態に密着する。また、そのようにフェルール３の先端側部３ａが第１のテーパ面７と接続管Ｐの外周との隙間に楔状に食い込み終える直前にフェルール３の後端部３ｂが第２のテーパ面９により径方向内方に押圧されて縮径変形を加えられながら接続管Ｐの外周に気密状態に密着する状態となる。   As the tightening nut 2 is screwed, the rear end portion 3b of the ferrule 3 is pushed inward in the axial direction by the ferrule pressing step 13, so that the ferrule 3 is propelled inward in the axial direction. The distal end side portion 3a is pressed radially inward by the first taper surface 7 and is subjected to a diameter-reducing deformation so as to bite into the gap between the first taper surface 7 and the outer periphery of the connecting pipe P. The outer periphery of the connection pipe P and the first tapered surface 7 are in close contact with each other in an airtight state. In addition, the rear end portion 3b of the ferrule 3 is formed by the second tapered surface 9 immediately before the leading end side portion 3a of the ferrule 3 finishes biting into the gap between the first tapered surface 7 and the outer periphery of the connecting pipe P. It is in a state of being in close contact with the outer periphery of the connecting pipe P in an airtight state while being pressed inward in the radial direction and being subjected to reduced diameter deformation.

また、締付ナット２のフェルール押圧段部１３はフェルール３の後端部３ｂに対し線状接触して滑り易く、つまりフェルール３の後端部３ｂに対し空回りしながら該フェルール３を押し込むので、締付ナット３の回転力がフェルール３を介して接続管Ｐに伝わり難くなり、締付ナット２の締め付け時に接続管Ｐが共回りするのをよく防止できる。この場合、締付ナット２のフェルール押圧段部１３は減摩層１６を形成しているので、フェルール３の後端部３ｂに対し線状接触させることと相俟って更に滑り易くなって締付ナット２の回転力がフェルール３を介して接続管Ｐに伝わりにくくなり、接続管Ｐの共回り防止をより確実に行うことができる。   Further, the ferrule pressing step portion 13 of the tightening nut 2 is in a linear contact with the rear end portion 3b of the ferrule 3 and is slippery, that is, the ferrule 3 is pushed in while idling with respect to the rear end portion 3b of the ferrule 3. The rotational force of the tightening nut 3 becomes difficult to be transmitted to the connecting pipe P through the ferrule 3, and the connecting pipe P can be well prevented from rotating together when the tightening nut 2 is tightened. In this case, since the ferrule pressing step 13 of the tightening nut 2 forms the anti-friction layer 16, it becomes more slippery in combination with the linear contact with the rear end 3 b of the ferrule 3. The rotational force of the attached nut 2 is less likely to be transmitted to the connecting pipe P via the ferrule 3, and the joint pipe P can be prevented from rotating together more reliably.

このように締付ナット２の締め付けによりフェルール３の先端側部３ａが縮径変形しながら第１のテーパ面７と接続管Ｐの外周との隙間に食い込むことにより、接続管Ｐが継手本体１の受口部４から抜け出るのを阻止される状態に接続される。同時に、フェルール３の先端側部３ａが第１のテーパ面７と接続管Ｐの外周との隙間に食い込んで行って接続管Ｐの外周と第１のテーパ面７にそれぞれ気密状態に密着することにより、フェルール３の内周と接続管Ｐの外周との間の隙間が気密状にシールされるとともに、フェルール３の外周と継手本体１の第１のテーパ面７との間の隙間が気密状にシールされる状態が得られる。また、フェルール３の断面円形の後端部３ｂの内周が接続管Ｐの外周に気密状に密着するとともに、該後端部３ｂの外周が第２のテーパ面９に気密状に密着するシール状態が得られ、前記フェルール３の先端側部３ａによるシールと共に二重シールされる状態が得られる。   In this way, when the tightening nut 2 is tightened, the distal end side portion 3a of the ferrule 3 is deformed in a reduced diameter and bites into the gap between the first tapered surface 7 and the outer periphery of the connecting pipe P, so that the connecting pipe P becomes the joint body 1. It is connected to a state in which it is prevented from coming out of the receiving portion 4 of this. At the same time, the distal end side portion 3a of the ferrule 3 bites into the gap between the first taper surface 7 and the outer periphery of the connection pipe P, and comes into close contact with the outer periphery of the connection pipe P and the first taper surface 7 respectively. Thus, the gap between the inner periphery of the ferrule 3 and the outer periphery of the connecting pipe P is sealed in an airtight manner, and the gap between the outer periphery of the ferrule 3 and the first tapered surface 7 of the joint body 1 is airtight. It is possible to obtain a state of being sealed. Further, the inner periphery of the rear end portion 3b having a circular cross section of the ferrule 3 is in airtight contact with the outer periphery of the connection pipe P, and the outer periphery of the rear end portion 3b is in airtight contact with the second tapered surface 9 A state is obtained, and a state of being double-sealed together with a seal by the tip side portion 3a of the ferrule 3 is obtained.

上記実施例ではフェルール３の後端部３ｂが断面円形に形成されるが、これに代えて図３に示すように、フェルール３の後端部３の断面形状は、少なくともフェルール押圧段部１３に線状接触する頂点ａと、接続管Ｐの外周に当接する頂点ｂとを有する多角形に形成するものであってもよい。この場合、継手本体１に第２のテーパ面９を設ける場合はそのテーパ面９に当接する頂点ｃをも有する多角形断面の後端部３ｂに形成する。   In the above embodiment, the rear end portion 3b of the ferrule 3 is formed in a circular cross section. Instead, as shown in FIG. 3, the cross sectional shape of the rear end portion 3 of the ferrule 3 is at least at the ferrule pressing step 13. You may form in the polygon which has the vertex a which contacts linearly, and the vertex b which contact | abuts the outer periphery of the connection pipe P. FIG. In this case, when providing the 2nd taper surface 9 in the coupling main body 1, it forms in the rear-end part 3b of the polygonal cross section which also has the vertex c contact | abutted to the taper surface 9. FIG.

本発明は、上記継手本体１が図示例のソケットタイプ以外に、エルボあるいはＴ型等である場合にも同様に適用できる。   The present invention can be similarly applied to the case where the joint body 1 is an elbow or a T type other than the socket type shown in the drawing.

本発明の一実施例を示す管継手の半欠截断面図である。1 is a half-broken cross-sectional view of a pipe joint showing an embodiment of the present invention. 図１の管継手に組み込まれるフェルールの断面図である。It is sectional drawing of the ferrule integrated in the pipe joint of FIG. 他の実施例を示す管継手の一部断面図である。It is a partial cross section figure of the pipe joint which shows another Example. 従来例の管継手の半欠截断面図である。It is a half notched cross-sectional view of a conventional pipe joint.

符号の説明Explanation of symbols

Ｐ 接続管
１ 継手本体
２ 締付ナット
３ フェルール
３ａ フェルールの先端側部
３ｂ フェルールの後端部
４ 受口部
７ 第１のテーパ面
９ 第２のテーパ面
１１ 雄ねじ
１２ 雌ねじ
１３ フェルール押圧段部
１５ フェルールのテーパ面
１６ 減摩層 P Connecting pipe 1 Joint body 2 Clamping nut 3 Ferrule 3a Ferrule tip side 3b Ferrule rear end 4 Receiving portion 7 First taper surface 9 Second taper surface 11 Male screw 12 Female screw 13 Ferrule pressing step 15 Tapered surface of ferrule 16 Anti-friction layer

Claims (7)

金属製の接続管の一端部が差し込まれる受口部を有する継手本体と、この継手本体の前記受口部の外周に設けた雄ねじにねじ込み結合されかつ前記接続管の外周に遊嵌される締付ナットと、前記継手本体の受口部の内部に配され、前記接続管の外周に嵌合する円筒形状のフェルールと、を備えており、
前記受口部の内周に、前記フェルールの先端側部の当接により該先端部に縮径作用を加える第１のテーパ面が軸方向外方に向かって漸次拡がり状に形成されており、
前記締付ナットの内周に、前記雄ねじに螺合する雌ねじと、この雌ねじの軸方向外端側に設けられるフェルール押圧段部とが形成され、前記フェルール押圧段部が前記締付ナットの螺進に伴って前記フェルールの後端部を軸方向内方へ押し込むことで該フェルールの先端側部が前記第１のテーパ面と前記接続管外周との隙間に食い込んで前記接続管外周と前記第１のテーパ面に気密状態に密着するようにしてあり、
前記フェルールの後端部が断面円形に形成され、その円周一部が前記フェルール押圧段部に対し線状接触し、その円周他部が前記接続管の外周に当接するようにしてあることを特徴とする、管継手。 A joint main body having a receiving portion into which one end of a metal connecting pipe is inserted, and a tightening screwed into a male screw provided on the outer periphery of the receiving portion of the joint main body and loosely fitted on the outer periphery of the connecting pipe An attached nut and a cylindrical ferrule that is disposed inside the receiving portion of the joint body and fits to the outer periphery of the connecting pipe,
A first taper surface that applies a diameter-reducing action to the tip portion by abutting the tip side portion of the ferrule is formed on the inner periphery of the receiving portion so as to gradually expand outward in the axial direction.
A female screw that is screwed to the male screw and a ferrule pressing step provided on the axially outer end side of the female screw are formed on an inner periphery of the tightening nut, and the ferrule pressing step is screwed on the tightening nut. The rear end portion of the ferrule is pushed inward in the axial direction as it advances, so that the front end side portion of the ferrule bites into the gap between the first tapered surface and the outer periphery of the connection tube, and the outer periphery of the connection tube and the first 1 is in close contact with the taper surface in an airtight state,
A rear end portion of the ferrule is formed in a circular shape in cross section, a part of the circumference thereof is in linear contact with the ferrule pressing step part, and the other part of the circumference is in contact with the outer periphery of the connection pipe. Characteristic pipe fittings. 金属製の接続管の一端部が差し込まれる受口部を有する継手本体と、この継手本体の前記受口部の外周に設けた雄ねじにねじ込み結合されかつ前記接続管の外周に遊嵌される締付ナットと、前記継手本体の受口部の内部に配され、前記接続管の外周に嵌合する円筒形状のフェルールと、を備えており、
前記受口部の内周に、前記フェルールの先端側部の当接により該先端部に縮径作用を加える第１のテーパ面が軸方向外方に向かって漸次拡がり状に形成されており、
前記締付ナットの内周に、前記雄ねじに螺合する雌ねじと、この雌ねじの軸方向外端側に設けられるフェルール押圧段部とが形成され、前記フェルール押圧段部が前記締付ナットの螺進に伴って前記フェルールの後端部を軸方向内方へ押し込むことで該フェルールの先端側部が前記第１のテーパ面と前記接続管外周との隙間に食い込んで前記接続管外周と前記第１のテーパ面に気密状態に密着するようにしてあり、
前記フェルールの後端部の断面形状が、少なくとも前記フェルール押圧段部に線状接触する頂点と、前記接続管の外周に当接する頂点とを有する多角形に形成されていることを特徴とする、管継手。 A joint main body having a receiving portion into which one end of a metal connecting pipe is inserted, and a tightening screwed into a male screw provided on the outer periphery of the receiving portion of the joint main body and loosely fitted on the outer periphery of the connecting pipe An attached nut and a cylindrical ferrule that is disposed inside the receiving portion of the joint body and fits to the outer periphery of the connecting pipe,
A first taper surface that applies a diameter-reducing action to the tip portion by abutting the tip side portion of the ferrule is formed on the inner periphery of the receiving portion so as to gradually expand outward in the axial direction.
A female screw that is screwed to the male screw and a ferrule pressing step provided on the axially outer end side of the female screw are formed on an inner periphery of the tightening nut, and the ferrule pressing step is screwed on the tightening nut. The rear end portion of the ferrule is pushed inward in the axial direction as it advances, so that the front end side portion of the ferrule bites into the gap between the first tapered surface and the outer periphery of the connection tube, and the outer periphery of the connection tube and the first 1 is in close contact with the taper surface in an airtight state,
The cross-sectional shape of the rear end portion of the ferrule is formed into a polygon having at least a vertex that linearly contacts the ferrule pressing step portion and a vertex that abuts the outer periphery of the connection pipe , Pipe fittings. 前記受口部の軸方向外側開口端の内周に、前記フェルールの後端部の当接により該後端部に縮径作用を加える第２のテーパ面が軸方向外方に向かって漸次拡がり状に形成されている、請求項１又は請求項２に記載の管継手。 On the inner periphery of the axially outer opening end of the receiving portion, a second taper surface that applies a diameter reducing action to the rear end portion by contact of the rear end portion of the ferrule gradually expands outward in the axial direction. The pipe joint according to claim 1 or 2, wherein the pipe joint is formed in a shape . 前記フェルールの先端側部の外周が先窄まり状のテーパ面に形成されている、請求項１ないし３のいずれか１項に記載の管継手。 The pipe joint according to any one of claims 1 to 3, wherein an outer periphery of a tip side portion of the ferrule is formed in a tapered tapered surface . 前記雄ねじ及び／又は雌ねじに減摩層を形成している、請求項１ないし４のいずれか１項に記載の管継手。 The pipe joint according to any one of claims 1 to 4 , wherein an anti-friction layer is formed on the male screw and / or the female screw . 前記フェルール押圧段部にも減摩層を形成している、請求項５に記載の管継手。 The pipe joint according to claim 5, wherein an antifriction layer is also formed on the ferrule pressing step . 前記減摩層が塗料タイプの二硫化モリブデンの焼付塗装により形成されている、請求項５又は６に記載の管継手。 The pipe joint according to claim 5 or 6, wherein the anti-friction layer is formed by baking coating of a paint type molybdenum disulfide .
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