JP5404147B2 - Fitting for flexible tube - Google Patents
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- JP5404147B2 JP5404147B2 JP2009098509A JP2009098509A JP5404147B2 JP 5404147 B2 JP5404147 B2 JP 5404147B2 JP 2009098509 A JP2009098509 A JP 2009098509A JP 2009098509 A JP2009098509 A JP 2009098509A JP 5404147 B2 JP5404147 B2 JP 5404147B2
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Description
本発明はフレキシブルチューブ用継手に関し、特にガス配管などに用いられるコルゲイト管にて構成されたフレキシブルチューブを接続するための継手に関する。 The present invention relates to a joint for a flexible tube, and more particularly to a joint for connecting a flexible tube composed of a corrugate pipe used for gas piping or the like.
この種のフレキシブルチューブ用継手として、たとえば特許文献１に記載されたものがある。この継手は、一端側の筒状本体と他端側の止輪からなり、止輪の他端（挿し口）から内部に、フレキシブルチューブを構成するコルゲイト管の先端部を挿入することで、これら継手本体とコルゲイト管とが互いに接合されるように構成されている。この継手構造では、フレキシブルチューブに引き抜き方向の力がかかると、継手本体と止輪との間に内装されてコルゲイト管に外嵌される抜け止め具であるリテーナが谷部に嵌合して継手本体内のテーパ部に係止され、抜け止めされる。 As this kind of joint for flexible tubes, there exists a thing described in patent documents 1, for example. This joint consists of a cylindrical body at one end and a retaining ring at the other end, and by inserting the distal end of the corrugate tube constituting the flexible tube into the inside from the other end (insertion opening) of the retaining ring. The joint body and the corrugate pipe are configured to be joined to each other. In this joint structure, when a force in the pulling direction is applied to the flexible tube, a retainer, which is a retainer that is fitted between the joint body and the retaining ring and is fitted on the corrugate pipe, fits into the valley portion. It is locked to the taper portion in the body and is prevented from coming off.
たとえば特許文献１に記載されたフレキシブルチューブ用継手を、図６を参照して説明する。１はフレキシブルチューブで、薄肉のステンレス製のコルゲイト管２と、このコルゲイト管２の外周を覆う樹脂製のチューブ状の被覆体３とによって構成されている。コルゲイト管２において、４は山部、５は谷部である。このフレキシブルチューブ１は、コルゲイト管２の先端側で所定数の山部４につき被覆体３が取り除かれた状態で継手１０に接合される。 For example, the joint for flexible tubes described in patent document 1 is demonstrated with reference to FIG. Reference numeral 1 denotes a flexible tube, which is composed of a thin stainless corrugate tube 2 and a resin tube-like covering 3 covering the outer periphery of the corrugate tube 2. In the corgate pipe 2, 4 is a peak and 5 is a valley. The flexible tube 1 is joined to the joint 10 in a state in which the covering 3 is removed from a predetermined number of peak portions 4 on the distal end side of the corrugate tube 2.
この継手１０は、筒状本体１１とこの筒状本体１１の同一軸心上に一体に接続される止め輪３１からなり、筒状本体１１は、真鍮などの金属によって形成され、その一端側に外ねじ部１２が形成されて、ガス管やガス器具などの被接続体に接続することができるように構成されている。１３は工具掛かり部で、外ねじ部１２のねじ込み操作のために用いられる。筒状本体１１の他端側の内周には、その他端側から順に、内ねじ部１５と、入口側内周面１６と、奥側内周面２１とが形成され、さらに奥側内周面２１のエンド部に奥端面１９が形成されている。この奥端面１９の内周端部に、コルゲイト管２を案内するための筒状突部２０が他端側に突出して形成され、奥側内周面２１と筒状突部２０との間に、コルゲイト管２の先端部と後述のシール材とを収容する環状収容部２２が形成されている。また筒状突部２０の他端部外周面には、コルゲイト管２の嵌入を案内するテーパ面１４が形成されている。 The joint 10 includes a cylindrical main body 11 and a retaining ring 31 that is integrally connected to the same axial center of the cylindrical main body 11. The cylindrical main body 11 is formed of a metal such as brass, and has one end side thereof. An external thread portion 12 is formed so that it can be connected to a connected body such as a gas pipe or a gas appliance. Reference numeral 13 denotes a tool hook portion used for screwing the outer screw portion 12. On the inner circumference on the other end side of the cylindrical main body 11, an inner screw portion 15, an inlet-side inner circumference surface 16, and a rear-side inner circumference surface 21 are formed in order from the other end side. A back end surface 19 is formed at the end of the surface 21. A cylindrical projection 20 for guiding the corrugate tube 2 is formed on the inner peripheral end of the rear end surface 19 so as to protrude to the other end side, and between the inner peripheral surface 21 and the cylindrical projection 20. An annular housing portion 22 is formed for housing the distal end portion of the corrugate tube 2 and a sealing material described later. A tapered surface 14 that guides the insertion of the corrugate tube 2 is formed on the outer peripheral surface of the other end of the cylindrical protrusion 20.
そして環状収容部２２の内周部にコルゲイト管２の先端部分が配置され、図６（ａ）に示す構造において、環状収容部２２のシール材２３は、一端側（奥側）の標準シール材２５Ａと、他端側（入口側）の耐火シール材２４Ａとで構成される。また図６（ｂ）に示す構造において、環状収容部２２のシール材２３は、一端側の耐火シール材２４Ｂと、他端側の標準シール材２５Ｂとで構成される。 And the front-end | tip part of the corrugate pipe | tube 2 is arrange | positioned at the inner peripheral part of the cyclic | annular accommodating part 22, and in the structure shown to Fig.6 (a), the sealing material 23 of the cyclic | annular accommodating part 22 is a standard sealing material of one end side (back side). 25A and a fireproof sealing material 24A on the other end side (inlet side). In the structure shown in FIG. 6B, the sealing material 23 of the annular housing portion 22 is composed of a fireproof sealing material 24B on one end side and a standard sealing material 25B on the other end side.
止輪３１は、真鍮などの金属によって筒状に形成されるとともに、その一端側に、筒状本体１１の内ねじ部１５にねじ込み可能な外ねじ部３２が形成され、止輪３１の他端側の外周に、外ねじ部３２よりも大径の外周面３３が形成されている。そして止輪３１の軸心部に、フレキシブルチューブ１を挿通させるための孔部３４が貫通状態で形成されている。この孔部３４における止輪３１の他端側の内周にパッキン３５が収容され、また孔部３４における止輪３１の一端側内周には、この止輪３１の一端側に向かって拡径するテーパ受け面３６が形成されている。さらに、止輪３１を筒状本体１１にねじ込んだ状態においては、この止輪３１内周のテーパ受け面３６と筒状本体１１の入口側内周面１６とシール材２３の端面とで囲まれる空間３７が形成され、この空間３７に抜け止め具である環状のリテーナ３８が配置されている。 The retaining ring 31 is formed in a cylindrical shape with a metal such as brass, and an outer threaded portion 32 that can be screwed into the inner threaded portion 15 of the tubular body 11 is formed on one end side of the retaining ring 31. An outer peripheral surface 33 having a diameter larger than that of the external screw portion 32 is formed on the outer periphery on the side. A hole 34 for inserting the flexible tube 1 is formed in a through state in the axial center portion of the retaining ring 31. The packing 35 is accommodated in the inner periphery of the other end side of the retaining ring 31 in the hole 34, and the diameter of the inner end of the retaining ring 31 in the hole 34 is increased toward one end side of the retaining ring 31. A taper receiving surface 36 is formed. Further, when the retaining ring 31 is screwed into the cylindrical body 11, the retaining ring 31 is surrounded by the tapered receiving surface 36 on the inner periphery of the retaining ring 31, the inlet-side inner peripheral surface 16 of the cylindrical body 11, and the end surface of the sealing material 23. A space 37 is formed, and an annular retainer 38 serving as a retainer is disposed in the space 37.
このリテーナ３８は、真鍮などの金属材料により形成され、その一端側すなわち筒状本体１１の奥側には、径方向内向きの突部３９が形成されている。この突部３９は、コルゲイト管２が継手１０に挿入されたときにこのコルゲイト管２の谷部５にはまり込むことが可能とされている。またリテーナ３８の外周には、止輪３１のテーパ受け面３６に接触可能なテーパ面４０が形成されている。さらにリテーナ３８は、突部３９を有した一端側から他端側に向かう軸心方向の切り込みが周方向の複数の位置に形成されることで、図示の状態から突部３９が拡径できるように構成されている。そしてリテーナ３８の一端側の外周には、横断面が矩形状の環状溝４１が形成され、この環状溝４１にはリテーナ３８の突部３９が図示の縮径状態になるように力を及ぼすためのリングばね４２がはめ込まれている。 The retainer 38 is formed of a metal material such as brass, and a radially inward protruding portion 39 is formed on one end side thereof, that is, on the back side of the cylindrical main body 11. The protrusion 39 can be fitted into the valley portion 5 of the corrugate tube 2 when the corgate tube 2 is inserted into the joint 10. A tapered surface 40 that can contact the tapered receiving surface 36 of the retaining ring 31 is formed on the outer periphery of the retainer 38. Furthermore, the retainer 38 is formed with a plurality of axial cuts in the axial direction from one end side to the other end side having the protrusion 39 so that the diameter of the protrusion 39 can be increased from the illustrated state. It is configured. An annular groove 41 having a rectangular cross section is formed on the outer periphery on one end side of the retainer 38, and a force is applied to the annular groove 41 so that the protruding portion 39 of the retainer 38 is in the reduced diameter state shown in the figure. The ring spring 42 is fitted.
筒状本体１１の端面と、この筒状本体１１よりも外側における止輪３１の端面との間には、継手１０の内部から外部へのガスの通過は許容するが、継手１０の外部から内部への水の通過は許容しないパッキン４３が設けられている。 Between the end surface of the cylindrical main body 11 and the end surface of the retaining ring 31 outside the cylindrical main body 11, passage of gas from the inside of the joint 10 to the outside is permitted, but from the outside of the joint 10 to the inside A packing 43 that does not allow water to pass therethrough is provided.
図６は、継手１０の内部に、フレキシブルチューブ１の先端部分が挿入されている状態を示している。フレキシブルチューブ１を継手１０に接合する際には、フレキシブルチューブ１の先端の一定範囲で被覆体３を除去してコルゲイト管２を露出させた状態で、これを継手１０の内部に挿入する。このとき、コルゲイト管２は、その先端部がリテーナ３８を押し広げてこのリテーナ３８の位置を通過したうえで、シール材２３の内周に挿入される。このとき、コルゲイト管２の先端部は、耐火シール材２４Ａ，２４Ｂおよび標準シール材２５Ａ，２５Ｂの内周を通って奥端部に到達し、適当数の山部４の外周が少なくとも標準シール材２５Ａ，２５Ｂの内周に密接している。また、リテーナ３８の突部３９が、コルゲイト管２におけるその先端から距離をおいた位置の谷部５にはまり込んでいる。止輪３１の内部には、フレキシブルチューブ１における被覆体３の先端部がはまり込んでいる。パッキン３５は、この被覆体３の外周をシールすることで、継手１０の内部に水などが浸入するのを防止する。 FIG. 6 shows a state where the distal end portion of the flexible tube 1 is inserted into the joint 10. When joining the flexible tube 1 to the joint 10, the covering 3 is removed within a certain range at the tip of the flexible tube 1, and the corgate pipe 2 is exposed, and this is inserted into the joint 10. At this time, the corrugate tube 2 is inserted into the inner periphery of the seal member 23 after the tip portion of the corrugate tube 2 pushes the retainer 38 and passes through the position of the retainer 38. At this time, the distal end portion of the corrugate pipe 2 passes through the inner circumferences of the refractory seal materials 24A and 24B and the standard seal materials 25A and 25B to reach the rear end portion, and the outer circumference of an appropriate number of peaks 4 is at least the standard seal material. Close to the inner circumference of 25A and 25B. Further, the protrusion 39 of the retainer 38 is fitted in the valley portion 5 at a position away from the tip of the corgate tube 2. Inside the retaining ring 31, the distal end portion of the covering 3 in the flexible tube 1 is fitted. The packing 35 seals the outer periphery of the covering 3 to prevent water and the like from entering the joint 10.
継手１０とフレキシブルチューブ１との間のシールは、通常時は軟質の標準シール材２５Ａ，２５Ｂによって行われる。火災発生時などにおいて高温に晒されたときには、標準シール材２５Ａ，２５Ｂは焼失するが、それに代わって耐火シール材２４Ａ，２４Ｂがシール機能を発揮する。すなわち、耐火シール材２４Ａ，２４Ｂは、上述のように熱膨張性の部材によって形成されているのが通例であり、高温に晒されたときに体積が増大することで、標準シール材２５Ａ，２５Ｂの焼失などによって生じた空隙を埋め、それによって所要のシール機能を発揮する。 Sealing between the joint 10 and the flexible tube 1 is normally performed with soft standard sealing materials 25A and 25B. When exposed to a high temperature in the event of a fire or the like, the standard sealing materials 25A and 25B burn out, but instead, the fireproof sealing materials 24A and 24B exhibit a sealing function. That is, the fireproof sealing materials 24A and 24B are typically formed of a thermally expandable member as described above, and the volume increases when exposed to high temperatures, so that the standard sealing materials 25A and 25B are formed. It fills the gaps caused by the burning and the like, thereby exerting the required sealing function.
フレキシブルチューブ１に継手からの抜け出し力が作用した場合には、コルゲイト管２の一つの谷部５に突部３９がはまり込んでいるリテーナ３８の外周のテーパ面４０が止輪３１のテーパ受け面３６に当たり、リテーナ３８は止輪３１から径方向内向きの反力を受ける。すると、リテーナ３８とコルゲイト管２との引掛り状態が確実なものになり、これによって継手１０からのフレキシブルチューブ１の抜け出しが防止される。 When the pull-out force from the joint is applied to the flexible tube 1, the tapered surface 40 of the outer periphery of the retainer 38 in which the projection 39 is fitted in one valley portion 5 of the corrugate tube 2 is the tapered receiving surface of the retaining ring 31. 36, the retainer 38 receives a radially inward reaction force from the retaining ring 31. As a result, the hooked state of the retainer 38 and the corrugate tube 2 is ensured, thereby preventing the flexible tube 1 from coming out of the joint 10.
このようにして継手１０とフレキシブルチューブ１とが接合されることでガス配管を構成することができ、このガス配管を用いてたとえばガス管とガス器具との間の配管に供することができる。 Thus, gas pipe can be constituted by joining joint 10 and flexible tube 1, and it can use for piping between a gas pipe and a gas appliance, for example using this gas pipe.
上記において、常温における通常の使用時には、耐火シール材２４Ａ，２４Ｂは、硬質であるために実質的なシール機能を発揮せず、実際には軟質の標準シール部２５Ａ，２５Ｂのみしかシールに寄与していない。すると、環状収容部２２内には、耐火シール材２４Ａ，２４Ｂと標準シール材２５Ａ，２５Ｂとが軸心方向に並んで配置された構成となっているために、標準シール材２５Ａ，２５Ｂの軸心方向の長さが耐火シール材２４Ａ，２４Ｂにより制限され、標準シール材２５Ａ，２５Ｂが接するコルゲイト管２の山部４が１〜１．５個程度となり、シール性が十分でないという問題があった。ここで、耐火シール材２４Ａ，２４Ｂは、高温に晒された時にコルゲイト管２に十分な接触面積を確保するために、十分な体積を確保する必要がある。 In the above, at the time of normal use at normal temperature, the fireproof sealing materials 24A and 24B are hard and therefore do not perform a substantial sealing function. In fact, only the soft standard seal portions 25A and 25B contribute to the seal. Not. Then, since the fireproof sealing materials 24A and 24B and the standard sealing materials 25A and 25B are arranged in the axial direction in the annular housing portion 22, the shafts of the standard sealing materials 25A and 25B are arranged. The length in the center direction is limited by the fireproof sealing materials 24A and 24B, and there are about 1 to 1.5 peak portions 4 of the corgate pipe 2 with which the standard sealing materials 25A and 25B are in contact. It was. Here, the fireproof sealing materials 24A and 24B need to ensure a sufficient volume in order to ensure a sufficient contact area with the corrugate tube 2 when exposed to high temperatures.
そこで本発明は、常温における通常の使用時におけるシール性を向上させることができるとともに、高温に晒されたときのシール性も十分に確保できるフレキシブルチューブ用継手を提供することを目的とする。 Therefore, an object of the present invention is to provide a flexible tube joint that can improve the sealing performance during normal use at room temperature and can sufficiently ensure the sealing performance when exposed to high temperatures.
この目的を達成するため本発明の請求項１に係る発明は、
同一軸心上に一体に接合された一端側の筒状本体と他端側の止輪からなり、山部と谷部を有するコルゲイト管に被覆体が外嵌されたフレキシブルチューブを、止輪の挿し口から筒状本体の内部に挿入することで、コルゲイト管を筒状本体に接合可能としたフレキシブルチューブ用継手であって、
筒状本体の奥側内周面の奥端面に、コルゲイト管の挿入を案内する筒状突部を他端側に突出させて、当該筒状突部と前記奥側内周面との間に、コルゲイト管の先端部分とシール材とを収容する環状収容部を形成し、
当該環状収容部の奥端部の全面に、耐火性能を有し高温に晒されると膨張してシール機能を発揮する耐火シール材を配置し、
前記環状収容部でコルゲイト管の先端部分の外周部に所定数の山部にわたって、耐火性能を有しないが常温でシール機能を発揮する標準シール材を配置し、
前記標準シール材を、コルゲイト管の所定数の山部外周に接する長さに形成し、
止輪に、筒状本体に装着される基端筒部と、当該基端筒部に取り付けられて透明な樹脂材料で形成された先端筒部とを設け、
前記先端筒部を、挿し口の内周に環状突部が形成された外筒部と、当該外筒部に内嵌されて前記環状突部との間に被覆体の外周面との隙間をシールするパッキンの収容溝を形成する規制筒部とで構成し、
前記規制筒部の内面に奥側が小径となる段部を形成して、この段部をコルゲイト管の先端部から一定長さで削除された被覆体の挿入を規制する規制部としたものである。
In order to achieve this object, the invention according to claim 1 of the present invention provides:
A flexible tube consisting of a cylindrical main body on one end and a retaining ring on the other end integrally joined on the same axis, with a covering externally fitted to a corrugate tube having a crest and a trough, By inserting the corrugate tube into the cylindrical main body by inserting it into the cylindrical main body from the insertion opening,
A cylindrical projection that guides the insertion of the corrugate tube is projected to the other end side on the inner end surface of the inner peripheral surface of the inner side of the cylindrical main body, and between the cylindrical projecting portion and the inner inner peripheral surface. Forming an annular accommodating portion for accommodating the tip portion of the corrugate tube and the sealing material;
Placing a fireproof sealing material that has a fireproof performance and expands when exposed to high temperatures over the entire back end of the annular housing,
A standard sealing material that does not have fire resistance but exhibits a sealing function at room temperature is disposed over the predetermined number of peaks on the outer peripheral portion of the tip portion of the corrugate pipe in the annular housing portion,
The standard sealing material is formed in a length in contact with the outer periphery of a predetermined number of ridges of the corrugate tube,
A snap ring is provided with a base end cylindrical part attached to the cylindrical main body, and a front end cylindrical part attached to the base end cylindrical part and formed of a transparent resin material,
A gap between the outer end surface of the covering body is formed between the outer tube portion in which an annular protrusion is formed on the inner periphery of the insertion opening and the outer tube portion and the annular protrusion. It is composed of a regulation cylinder part that forms an accommodation groove for the packing to be sealed,
A step portion having a small diameter on the back side is formed on the inner surface of the restriction tube portion, and this step portion is used as a restriction portion that restricts insertion of a covering body that has been removed from the distal end portion of the corrugate tube by a predetermined length. .
請求項２に記載の発明は、請求項１記載の構成において、
耐火シール材は、高温に晒されると、６乃至１２倍の体積に膨張して奥端部の全面からコルゲイト管の先端からその外周部および内周部を包囲して接するように膨張する材料としたものである。
The invention according to claim 2 is the configuration according to claim 1,
The fireproof sealing material expands to a volume of 6 to 12 times when exposed to a high temperature, and expands so as to surround and contact the outer peripheral portion and the inner peripheral portion from the front end of the corrugate tube from the entire back end portion. It is a thing.
請求項３記載の発明は、請求項１または２記載の構成において、
筒状本体と止輪との間に形成された空間部に、コルゲイト管を所定範囲で軸心方向に移動を許容するとともに抜け止めする環状の抜け止め具を設け、
標準シール材は、コルゲート管の少なくとも２個以上の山部外周に接する長さに形成されるとともに、コルゲイト管の先端部分に接した状態でコルゲイト管と共に軸心方向に移動されるように構成されたものである。
The invention according to claim 3 is the configuration according to claim 1 or 2,
In the space formed between the cylindrical main body and the retaining ring, an annular retainer for allowing the corgate pipe to move in the axial direction within a predetermined range and retaining it is provided,
The standard sealing material is formed to have a length in contact with the outer periphery of at least two ridges of the corrugated pipe, and is configured to move in the axial direction together with the corrugate pipe in a state of being in contact with the tip portion of the corgate pipe. It is a thing.
請求項１記載の構成によれば、耐火性シール材を環状収容部の奥端面全面に配置することで、必要な体積を確保しつつ、標準シール材を軸心方向に長くしてコルゲイト管の所定数の山部外周に接するように配置することができる。これにより常温における通常の使用時のシール性を向上させることができる。また高温に晒されたときには、耐火シール材を環状収容部の奥端部内で、コルゲイト管の先端を含むその内、外周側に接するように膨張させることができ、効果的にシールすることができる。
また、止輪の先端筒部を透明な樹脂により形成したので、フレキシブル管の先端から一定距離で削除したフレキシブルチューブの被覆体の先端が、規制部に当接しているかどうかを目視により確認するだけで、コルゲイト管が筒状本体の奥端部にまで達しているかどうかを確認することができ、客観的にかつ正確に判断することができる。
さらに先端筒部を、外筒部と規制筒部とで構成し、規制筒部の内面に、コルゲイト管の先端部から一定長さで削除された被覆体の挿入を規制する段部を形成して規制部としたので、樹脂製の先端筒部を機械加工することなくパッキンの収容溝を形成することで、機械加工の手間を省いて、低コスト化を図ることができる。
According to the configuration of the first aspect of the present invention, by disposing the fireproof sealing material over the entire inner surface of the annular housing portion, the standard sealing material is elongated in the axial direction while securing the necessary volume, and the corrugate tube It can arrange | position so that a predetermined number of mountain part outer periphery may be contact | connected. Thereby, the sealing performance in normal use at room temperature can be improved. Further, when exposed to high temperatures, the fireproof sealant can be inflated so as to be in contact with the outer peripheral side, including the tip of the corrugate tube, in the inner end of the annular housing portion, and can be effectively sealed. .
In addition, since the tip cylindrical part of the retaining ring is made of a transparent resin, it is only necessary to visually check whether the tip of the flexible tube covering that has been removed at a certain distance from the tip of the flexible pipe is in contact with the regulating part. Thus, it can be confirmed whether or not the corrugate tube has reached the far end of the cylindrical main body, and an objective and accurate determination can be made.
Furthermore, the distal end cylinder part is composed of an outer cylinder part and a restriction cylinder part, and a step part is formed on the inner surface of the restriction cylinder part to restrict the insertion of the covering that has been removed from the distal end part of the corrugate tube by a certain length. Therefore, by forming the packing receiving groove without machining the resin tip tube portion, the machining work can be saved and the cost can be reduced.
請求項２記載の構成によれば、高温で十分に膨張する耐火シール材を使用することで、高温に晒されたときに、耐火シール材が、環状収容部の奥端部から、筒状突部とコルゲイト管の先端部内周面の隙間と、奥側内周面とコルゲイト管の先端部外周面の空間とにそれぞれ充満され、コルゲイト管先端の内外周面を包み込むように十分な面積で接することで、効果的にシールすることができる。 According to the configuration of the second aspect, by using the fireproof seal material that expands sufficiently at high temperatures, the fireproof seal material is projected from the back end of the annular housing portion into the cylindrical protrusion when exposed to high temperatures. And the space between the inner peripheral surface of the distal end portion of the corrugate tube and the inner peripheral surface of the rear side and the outer peripheral surface of the distal end portion of the corgate tube are filled with each other, and contact with a sufficient area so as to wrap the inner peripheral surface of the distal end of the corgate tube Therefore, it can seal effectively.
請求項３記載の構成によれば、抜け止め具により、コルゲイト管の軸心方向の移動を許容して耐震性能を確保しつつ、コルゲイト管の外周部で２個以上の山部に接する標準シール材がコルゲイト管と共に移動されることで、地震発生時のシール性の低下を防止することができる。 According to the configuration of the third aspect, the standard seal that is in contact with two or more peaks at the outer peripheral portion of the corgate pipe while securing the seismic performance by allowing the movement of the corgate pipe in the axial direction by the stopper. By moving the material together with the corrugate tube, it is possible to prevent a decrease in sealing performance when an earthquake occurs.
［実施例１］
以下、本発明に係る実施例１を、図面を参照して説明する。
なお、従来例と同一部材には、同一符号を付して説明を省略する。
[Example 1]
Hereinafter, Example 1 concerning the present invention is described with reference to drawings.
Note that the same members as those in the conventional example are denoted by the same reference numerals and description thereof is omitted.
図１に示すように、環状収容部２２に収容されるシール材５０は、奥端面１９の全面に配置された環状の耐火シール材５１と、コルゲイト管２の外周面と奥側内周面２１との間で、耐火シール材５１の他端側に並んで配置された標準シール材５２とで構成されている。そしてこの標準シール材５２の他端面は、空間３７の他端側に位置している。 As shown in FIG. 1, the sealing material 50 accommodated in the annular accommodating portion 22 includes an annular refractory sealing material 51 disposed on the entire surface of the back end surface 19, an outer peripheral surface of the corgate pipe 2, and a rear inner peripheral surface 21. And a standard sealing material 52 arranged side by side on the other end side of the fireproof sealing material 51. The other end surface of the standard sealing material 52 is located on the other end side of the space 37.
耐火シール材５１は、たとえば熱膨張性黒鉛が混入されたニトリルゴムなどの、硬質ではあるが火災発生時などに対抗するための耐火性を有するとともに、火災発生時などの高温に晒されたときに数倍（６乃至１２倍）に膨張する材料により形成されている。したがって、高温に晒されたときには、図３に示すように、耐火シール材５１が環状収容部２２内で奥端部から、コルゲイト管２の先端部を含みその外周部と内周部を包み込むように接して膨張し、シール性を発揮する。 The fireproof sealing material 51 is hard but has a fire resistance for combating a fire or the like, such as a nitrile rubber mixed with a heat-expandable graphite, and when exposed to a high temperature such as a fire. It is made of a material that expands several times (6 to 12 times). Therefore, when exposed to high temperatures, as shown in FIG. 3, the fireproof sealing material 51 wraps the outer peripheral portion and the inner peripheral portion including the distal end portion of the corrugate pipe 2 from the inner end portion in the annular housing portion 22. Expands in contact with the surface and exhibits sealing properties.
また標準シール材５２は、ニトリルゴムなどのように耐火性は有しないが、軟質で常温でのシール性能にすぐれた材料により形成され、コルゲイト管２の先端部分の外周部で所定数、たとえば２個以上（図では３個）の山部４の外周に接する長さに形成されている。これは、限られた環状収容部２２において、耐火シール材５１が環状収容部２２の奥端部の全面、すなわち筒状突部２０の外周面から奥側内周面２１にわたって配置されていることから、耐火シール材５１が軸心方向に短くても、膨張によるシールに必要な体積を確保できる。このため、標準シール材５２の軸心方向の長さを、十分に長くできるためである。 The standard sealing material 52 does not have fire resistance such as nitrile rubber, but is formed of a soft material having excellent sealing performance at room temperature, and a predetermined number, for example, 2 at the outer peripheral portion of the distal end portion of the corgate tube 2. It is formed in the length which touches the outer periphery of the peak part 4 of three or more pieces (in the figure). This is because, in the limited annular housing portion 22, the fireproof sealing material 51 is disposed over the entire inner surface of the inner surface of the inner surface of the rear end portion of the annular housing portion 22, that is, from the outer peripheral surface of the cylindrical protrusion 20. Therefore, even if the fireproof sealing material 51 is short in the axial direction, the volume necessary for sealing by expansion can be secured. For this reason, it is because the length of the axial direction of the standard sealing material 52 can be made sufficiently long.
ここで、図２に示すように、地震などによりフレキシブルチューブ１が引き抜かれる方向の負荷を受けた場合であっても、コルゲイト管２がリテーナ３８により係止されるとともに、標準シール材５２がコルゲイト管２と共に移動し、コルゲイト管２の３個以上の山部４の外周に接した状態を維持することでシール性を保持することができる。 Here, as shown in FIG. 2, the corrugate tube 2 is locked by the retainer 38 and the standard sealing material 52 is corrugated even when subjected to a load in the direction in which the flexible tube 1 is pulled out due to an earthquake or the like. The sealability can be maintained by moving together with the pipe 2 and maintaining the state in contact with the outer periphery of three or more peaks 4 of the corrugate pipe 2.
止輪６１は、真鍮などの金属と透明樹脂の複合体で筒状に形成されている。すなわち、筒状本体１１に接合される金属製の基端筒部６３と、この基端筒部６３の他端側に嵌合固定されて外側からフレキシブルチューブ１が目視可能な透明な樹脂製の先端筒部６４とで構成されている。 The retaining ring 61 is formed in a cylindrical shape from a composite of a metal such as brass and a transparent resin. That is, it is made of a metallic base end cylindrical portion 63 joined to the cylindrical main body 11 and a transparent resin made to be fitted and fixed to the other end side of the base end cylindrical portion 63 so that the flexible tube 1 can be seen from the outside. It is comprised with the front-end | tip cylinder part 64. FIG.
前記基端筒部６３に、図４に示すように、筒状本体１１の内ねじ部１５にねじ込み可能な外ねじ部６２が形成されている。また基端筒部６３の外周部に一端側の大径部６５と、この大径部６５から段部を介して他端側に形成された小径部６６とが設けられ、この小径部６６には、段部に所定間隔をあけて２本の環状の係止溝６７が形成されている。 As shown in FIG. 4, an outer thread portion 62 that can be screwed into the inner thread portion 15 of the cylindrical main body 11 is formed in the proximal end tubular portion 63. In addition, a large-diameter portion 65 on one end side and a small-diameter portion 66 formed on the other end side from the large-diameter portion 65 through a stepped portion are provided on the outer peripheral portion of the proximal end cylindrical portion 63. Are formed with two annular locking grooves 67 at predetermined intervals in the step portion.
先端筒部６４は、外周側に配置される外筒部７０と、外筒部７０の孔部７１に内嵌めされて所定位置に配置される規制筒部７２とで構成されている。外筒部７０には、外ねじ部６２よりも大径の外周面７３と孔部７１とが形成されている。また外筒部７０の他端側に、基端筒部６３の小径部６６に外嵌されて接着されシールされる連結筒部７５と、この連結筒部７５の一端側の内周面に沿って中心側に突設されて係止溝６７にそれぞれ嵌合される環状爪部７６とが設けられている。さらに挿し口３０に対応して孔部７１の内周部に略三角形断面の環状突起７７が突設されている。 The distal end cylindrical portion 64 includes an outer cylindrical portion 70 disposed on the outer peripheral side, and a restriction cylindrical portion 72 that is fitted in the hole 71 of the outer cylindrical portion 70 and disposed at a predetermined position. The outer cylinder part 70 is formed with an outer peripheral surface 73 and a hole 71 having a diameter larger than that of the outer screw part 62. Further, on the other end side of the outer cylinder portion 70, a connecting cylinder portion 75 that is externally fitted to the small diameter portion 66 of the proximal end cylinder portion 63 and bonded and sealed, and an inner peripheral surface on one end side of the connecting cylinder portion 75. An annular claw portion 76 that protrudes from the center side and is fitted in the locking groove 67 is provided. Further, an annular protrusion 77 having a substantially triangular cross section is provided on the inner periphery of the hole 71 corresponding to the insertion opening 30.
前記規制筒部７２は、他端側の内周コーナ部にフレキシブルチューブ１を案内するための湾曲面７８と、フレキシブルチューブ１の被覆体３の挿入を許容する大径孔部７９が形成されている。またこの大径孔部７９に、規制段部（規制部）８１を介して、一端側に被覆体３の挿入を規制する小径孔部８０が形成されて規制部を構成している。 The regulation cylinder portion 72 is formed with a curved surface 78 for guiding the flexible tube 1 to the inner peripheral corner portion on the other end side and a large-diameter hole portion 79 that allows insertion of the cover 3 of the flexible tube 1. Yes. The large-diameter hole 79 is formed with a small-diameter hole 80 for restricting insertion of the cover 3 on one end side through a restricting step (regulator) 81 to constitute a restricting portion.
そして、外筒部７０の孔部７１内で環状突部７７と規制筒部７２との間に、リング状のパッキン８２の収容溝８３が形成されている。このパッキン８２は、内周側に周方向に沿ってシール片が突出されるＴ字形断面で、被覆体３の外周面と止輪３１との隙間をシールして水などの浸入を防止している。 An accommodation groove 83 for a ring-shaped packing 82 is formed between the annular projection 77 and the regulation cylinder 72 in the hole 71 of the outer cylinder 70. This packing 82 has a T-shaped cross section in which a seal piece protrudes along the circumferential direction on the inner peripheral side, and seals the gap between the outer peripheral surface of the cover 3 and the retaining ring 31 to prevent intrusion of water or the like. Yes.
ところで、樹脂製の先端筒部６４（外筒部７０と規制筒部７２）を一体成形した場合、成形により同時に収容溝８３を形成することができない。このため、成形後に機械加工により収容溝８３を形成する必要があり、これにより製造工程が複雑化して製造コストが嵩む。しかし、本発明では、先端筒部６４を、外筒部７０と規制筒部７２の２つの部品として、それぞれ成形した後に所定位置に嵌合させたままか、または嵌合して接する面を接着剤などにより固定することで、製造工程を単純化し、製造コストを低減させている。 By the way, when the resin-made front end cylinder part 64 (the outer cylinder part 70 and the regulation cylinder part 72) is integrally formed, the accommodation groove 83 cannot be formed simultaneously by the molding. For this reason, it is necessary to form the receiving groove 83 by machining after molding, which complicates the manufacturing process and increases the manufacturing cost. However, in the present invention, the distal end tubular portion 64 is formed as two parts, the outer tubular portion 70 and the restricting tubular portion 72, and is either fitted in a predetermined position after being molded, or the surfaces that are fitted and contacted are bonded. By fixing with an agent or the like, the manufacturing process is simplified and the manufacturing cost is reduced.
この状態の継手１０に、コルゲイト管２の先端が谷部５で切管され、かつコルゲイト管２の先端から所定距離だけ基端側で被覆体３が取り除かれた状態のフレキシブルチューブ１を、止輪６１の挿し口３０から小径孔部８０を介して筒状本体１１内に挿入する。 In the joint 10 in this state, the flexible tube 1 in a state in which the tip of the corrugate tube 2 is cut at the valley portion 5 and the covering 3 is removed at the base end side by a predetermined distance from the tip of the corgate tube 2 is stopped. The ring 61 is inserted into the cylindrical main body 11 through the small diameter hole 80 from the insertion port 30.
すると、コルゲイト管２の先端の山部４がリテーナ３８の突部３９を押し広げてこの突部３９の位置を通過し、標準シール材５２の内周に圧入されるとともに、コルゲイト管２の先端が耐火シール材５１に近接する位置まで押し込まれて環状収容部２２に収容される。この時、外筒部７０および規制筒部７２が透明な樹脂により形成されていることから、被覆体３の先端を目視することができるとともに、フレキシブルチューブ１が、コルゲイト管２の先端から一定距離で被覆体３が削除されていることから、目視により被覆体３の先端が規制段部８１に当接または近接していることを確認すると、コルゲイト管２の先端が耐火シール材５１に近接する位置まで圧入されていることになる。したがって、この被覆体３の先端の位置を、目視により外筒部７０および規制筒部７２を通して確認することにより、フレキシブルチューブ１と継手１０とが正常に接合されていることを正確に確認することができる。 Then, the crest 4 at the tip of the corrugate tube 2 pushes and expands the protrusion 39 of the retainer 38, passes through the position of this protrusion 39, and is press-fitted into the inner periphery of the standard seal material 52. Is pushed to a position close to the fireproof sealing material 51 and accommodated in the annular accommodating portion 22. At this time, since the outer cylinder part 70 and the regulation cylinder part 72 are formed of a transparent resin, the tip of the covering 3 can be visually observed, and the flexible tube 1 is fixed distance from the tip of the corrugate tube 2. Since the cover 3 is deleted in step S3, when it is confirmed by visual observation that the tip of the cover 3 is in contact with or close to the regulation step portion 81, the tip of the corrugate tube 2 approaches the fireproof sealing material 51. It will be press-fitted to the position. Therefore, by confirming the position of the tip of the covering 3 through the outer cylinder part 70 and the regulation cylinder part 72 by visual observation, it is accurately confirmed that the flexible tube 1 and the joint 10 are normally joined. Can do.
また環状収容部２２では、コルゲイト管２の先端面に対向して奥端面１９の全面に耐火シール材５１が配置されたことから、耐火シール材５１の体積を確保しつつ耐火シール材５１の軸心方向の長さを小さくし、その分、標準シール材５２の軸心方向の長さを、少なくともコルゲイト管２の３個の山部４に接するように形成することができる。これにより常温における通常の使用時のシール性を向上させることができる。 Further, in the annular housing portion 22, the fireproof seal material 51 is disposed on the entire surface of the back end surface 19 so as to face the front end surface of the corrugate pipe 2, so that the shaft of the fireproof seal material 51 is secured while ensuring the volume of the fireproof seal material 51. The length in the central direction can be reduced, and the length in the axial direction of the standard sealing material 52 can be formed so as to be in contact with at least the three peaks 4 of the corrugate tube 2. Thereby, the sealing performance in normal use at room temperature can be improved.
またコルゲイト管２に軸心方向に沿って引き抜き方向の負荷が発生した場合、コルゲイト管２の軸心方向の移動が所定範囲で許容されると共にリテーナ３８により抜け止めされるが、この時、コルゲイト管２の外周部で３つの山部４に接する標準シール材５２が環状収容部２２内でコルゲイト管２と共に所定範囲で移動されるので、地震発生時などのようにフレキシブルチューブ１を軸心方向に引き出す負荷がかかっても、シール性の低下を防止することができる。 In addition, when a load in the pulling direction is generated along the axial direction on the corgate pipe 2, the axial movement of the corgate pipe 2 is allowed within a predetermined range and is prevented from being detached by the retainer 38. Since the standard sealing material 52 in contact with the three crests 4 at the outer periphery of the tube 2 is moved within a predetermined range together with the corrugate tube 2 within the annular housing portion 22, the flexible tube 1 is axially moved as in the event of an earthquake. Even if a load to be pulled out is applied, it is possible to prevent a decrease in sealing performance.
さらに継手１０が高温に晒されたとき、耐火シール材５１が環状収容部２２の奥端部全面から、コルゲイト管２の内周面と筒状突部２０との隙間、およびコルゲイト管２の外周面と奥側内周面２１との空間部に沿って膨張され、耐火シール材５１が環状収容部２２内に充満されてコルゲイト管２の先端部とその内、外周面を包囲して接することから、コルゲイト管２と筒状本体１１の隙間を効果的にシールすることができる。 Further, when the joint 10 is exposed to a high temperature, the refractory seal material 51 extends from the entire rear end portion of the annular housing portion 22 to the gap between the inner peripheral surface of the corrugate pipe 2 and the cylindrical protrusion 20 and the outer periphery of the corgate pipe 2. It is expanded along the space between the surface and the inner peripheral surface 21 of the surface, and the fireproof sealing material 51 is filled in the annular housing portion 22 so as to surround and contact the distal end portion of the corrugate tube 2 and the outer peripheral surface thereof. Thus, the gap between the corrugate tube 2 and the cylindrical main body 11 can be effectively sealed.
１ フレキシブルチューブ
２ コルゲイト管
３ 被覆体
４ 山部
１０ 継手
１１ 筒状本体
１９ 奥端面
２０ 筒状突部
２１ 奥側内周面
２２ 環状収容部
３８ リテーナ
５０ シール材
５１ 耐火シール材
５２ 標準シール材
６１ 止輪
DESCRIPTION OF SYMBOLS 1 Flexible tube 2 Corrugate pipe 3 Covering body 4 Crest part 10 Joint 11 Tubular main body 19 Back end surface 20 Cylindrical protrusion 21 Back side inner peripheral surface 22 Annular accommodation part 38 Retainer 50 Sealing material 51 Fireproof sealing material 52 Standard sealing material 61 Retaining ring
Claims (3)
筒状本体の奥側内周面の奥端面に、コルゲイト管の挿入を案内する筒状突部を他端側に突出させて、当該筒状突部と前記奥側内周面との間に、コルゲイト管の先端部分とシール材とを収容する環状収容部を形成し、
当該環状収容部の奥端部の全面に、耐火性能を有し高温に晒されると膨張してシール機能を発揮する耐火シール材を配置し、
前記環状収容部でコルゲイト管の先端部分の外周部に所定数の山部にわたって、耐火性能を有しないが常温でシール機能を発揮する標準シール材を配置し、
前記標準シール材を、コルゲイト管の所定数の山部外周に接する長さに形成し、
止輪に、筒状本体に装着される基端筒部と、当該基端筒部に取り付けられて透明な樹脂材料で形成された先端筒部とを設け、
前記先端筒部を、挿し口の内周に環状突部が形成された外筒部と、当該外筒部に内嵌されて前記環状突部との間に被覆体の外周面との隙間をシールするパッキンの収容溝を形成する規制筒部とで構成し、
前記規制筒部の内面に奥側が小径となる段部を形成して、この段部をコルゲイト管の先端部から一定長さで削除された被覆体の挿入を規制する規制部とした
ことを特徴とするフレキシブルチューブ用継手。 A flexible tube consisting of a cylindrical main body on one end and a retaining ring on the other end integrally joined on the same axis, with a covering externally fitted to a corrugate tube having a crest and a trough, By inserting the corrugate tube into the cylindrical main body by inserting it into the cylindrical main body from the insertion opening,
A cylindrical projection that guides the insertion of the corrugate tube is projected to the other end side on the inner end surface of the inner peripheral surface of the inner side of the cylindrical main body, and between the cylindrical projecting portion and the inner inner peripheral surface. Forming an annular accommodating portion for accommodating the tip portion of the corrugate tube and the sealing material;
Placing a fireproof sealing material that has a fireproof performance and expands when exposed to high temperatures over the entire back end of the annular housing,
A standard sealing material that does not have fire resistance but exhibits a sealing function at room temperature is disposed over the predetermined number of peaks on the outer peripheral portion of the tip portion of the corrugate pipe in the annular housing portion,
The standard sealing material is formed in a length in contact with the outer periphery of a predetermined number of ridges of the corrugate tube,
A snap ring is provided with a base end cylindrical part attached to the cylindrical main body, and a front end cylindrical part attached to the base end cylindrical part and formed of a transparent resin material,
A gap between the outer end surface of the covering body is formed between the outer tube portion in which an annular protrusion is formed on the inner periphery of the insertion opening and the outer tube portion and the annular protrusion. It is composed of a regulation cylinder part that forms an accommodation groove for the packing to be sealed,
A step portion having a small diameter on the back side is formed on the inner surface of the restriction tube portion, and the step portion is used as a restriction portion for restricting insertion of a covering that has been removed from the tip portion of the corrugate tube by a predetermined length. A flexible tube joint.
ことを特徴とする請求項１記載のフレキシブルチューブ用継手。 The fireproof sealing material expands to a volume of 6 to 12 times when exposed to a high temperature, and expands so as to surround and contact the outer peripheral portion and the inner peripheral portion from the front end of the corrugate tube from the entire back end portion. The joint for flexible tubes according to claim 1, characterized in that:
標準シール材は、コルゲート管の少なくとも２個以上の山部外周に接する長さに形成されるとともに、コルゲイト管の先端部分に接した状態でコルゲイト管と共に軸心方向に移動されるように構成された
ことを特徴とする請求項１または２記載のフレキシブルチューブ用継手。 In the space formed between the cylindrical main body and the retaining ring, an annular retainer for allowing the corgate pipe to move in the axial direction within a predetermined range and retaining it is provided,
The standard sealing material is formed to have a length in contact with the outer periphery of at least two ridges of the corrugated pipe, and is configured to move in the axial direction together with the corrugate pipe in a state of being in contact with the tip portion of the corgate pipe. The joint for flexible tubes according to claim 1, wherein the joint is for a flexible tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009098509A JP5404147B2 (en) | 2009-04-15 | 2009-04-15 | Fitting for flexible tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009098509A JP5404147B2 (en) | 2009-04-15 | 2009-04-15 | Fitting for flexible tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2010249211A JP2010249211A (en) | 2010-11-04 |
| JP5404147B2 true JP5404147B2 (en) | 2014-01-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2009098509A Expired - Fee Related JP5404147B2 (en) | 2009-04-15 | 2009-04-15 | Fitting for flexible tube |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2012241744A (en) * | 2011-05-17 | 2012-12-10 | Keiyo Gas Kk | Joint for flexible tube |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4749616B2 (en) * | 2001-07-19 | 2011-08-17 | 日立金属株式会社 | Plug-in fittings |
| JP4736490B2 (en) * | 2005-03-23 | 2011-07-27 | 株式会社テクノフレックス | Plug-in fittings |
| JP2007211838A (en) * | 2006-02-08 | 2007-08-23 | Shinwa Sangyo Co Ltd | Joint for flexible tube |
| JP5207906B2 (en) * | 2008-10-02 | 2013-06-12 | 新和産業株式会社 | Fitting for flexible tube |
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| JP2010249211A (en) | 2010-11-04 |
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