JP2019023497A - Pipe joint - Google Patents
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- JP2019023497A JP2019023497A JP2017142993A JP2017142993A JP2019023497A JP 2019023497 A JP2019023497 A JP 2019023497A JP 2017142993 A JP2017142993 A JP 2017142993A JP 2017142993 A JP2017142993 A JP 2017142993A JP 2019023497 A JP2019023497 A JP 2019023497A
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- 230000002093 peripheral effect Effects 0.000 claims abstract description 74
- 210000000078 claw Anatomy 0.000 abstract description 61
- 239000011347 resin Substances 0.000 abstract description 6
- 229920005989 resin Polymers 0.000 abstract description 6
- 238000003780 insertion Methods 0.000 description 37
- 230000037431 insertion Effects 0.000 description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 20
- 238000000034 method Methods 0.000 description 15
- 230000008569 process Effects 0.000 description 11
- 238000005259 measurement Methods 0.000 description 9
- 230000007423 decrease Effects 0.000 description 5
- 238000007689 inspection Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 230000004308 accommodation Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
Abstract
Description
本発明は、管継手に関するものである。 The present invention relates to a pipe joint.
給水および給湯等のための配管に用いられる管継手として、給水栓等の器具に接続される第一流路部材と、給水管等を接続可能であるとともに上記第一流路部材に係合された樹脂製の第二流路部材と、その第二流路部材の上記第一流路部材に対する長期間にわたる係合を実現するためのインコアと、を備えたものが知られている(例えば特許文献1)。 As a pipe joint used for piping for water supply and hot water supply, etc., a first flow path member connected to an instrument such as a water tap, and a resin that can be connected to a water supply pipe etc. and engaged with the first flow path member A device including a second channel member made of metal and an in-core for realizing long-term engagement of the second channel member with the first channel member is known (for example, Patent Document 1). .
特許文献1の管継手では、第一流路部材の外筒部に対して第二流路部材の内筒部が圧入されており、上記内筒部の外周面に形成された外向き爪部が上記外筒部の内周面に形成された内向き爪部とスナップ係合することにより、第二流路部材が第一流路部材から抜けないようになっている。また、上記内筒部の内側にはインコアが嵌合されている。このインコアによって内筒部の縮径方向への変形が抑えられることにより、上記内筒部の外向き爪部と上記外筒部の内向き爪部とが係合した状態で保持されるとともに、第一流路部材と第二流路部材とが相対回転しない状態で連結されている。 In the pipe joint of Patent Literature 1, the inner cylinder portion of the second flow path member is press-fitted with respect to the outer cylinder portion of the first flow path member, and the outward claw portion formed on the outer peripheral surface of the inner cylinder portion has The second flow path member is prevented from coming out of the first flow path member by snap-engaging with an inward claw part formed on the inner peripheral surface of the outer cylinder part. An in-core is fitted inside the inner cylinder part. By suppressing the deformation in the reduced diameter direction of the inner cylinder portion by the in-core, the outward claw portion of the inner cylinder portion and the inward claw portion of the outer cylinder portion are held in an engaged state, and The first flow path member and the second flow path member are connected so as not to rotate relative to each other.
また特許文献1の管継手では、第一流路部材と同第一流路部材に接続された給水管との間にOリングが設けられており、それら第一流路部材および給水管を相対回転させるように作用する捩りモーメントが所定レベル以上になったときに、Oリングと第一流路部材(あるいは給水管)とが相対回転するようになっている。これにより、給水管を管継手に接続した後に給水管や管継手に捩りモーメントが作用した場合であっても、同捩りモーメントを低減するように給水管と管継手とを相対回転させることが可能になり、管継手や給水管に捩りモーメントが作用し続ける状態になることが抑えられる。 Further, in the pipe joint of Patent Document 1, an O-ring is provided between the first flow path member and the water supply pipe connected to the first flow path member, so that the first flow path member and the water supply pipe are relatively rotated. The O-ring and the first flow path member (or the water supply pipe) rotate relative to each other when the torsional moment acting on the pressure reaches a predetermined level or more. As a result, even if a torsional moment is applied to the water supply pipe or pipe joint after the water supply pipe is connected to the pipe joint, the water supply pipe and the pipe joint can be rotated relative to each other so as to reduce the torsional moment. Therefore, it is possible to prevent the torsional moment from continuing to act on the pipe joint and the water supply pipe.
ここで、管継手や同管継手に接続される器具(給水管や給水栓等)に作用する捩りモーメントを抑えるための構造は、上述した管継手と上記器具との間に相対回転可能なシールリングを配設する構造に限定されない。 Here, the structure for suppressing the torsional moment acting on the pipe joint and the equipment (water supply pipe, faucet, etc.) connected to the pipe joint is a seal capable of relative rotation between the pipe joint and the equipment. It is not limited to the structure for disposing the ring.
本発明は、そうした実情に鑑みてなされたものであり、その目的は、管継手や同管継手に接続される器具に作用する捩りモーメントを抑えることのできる管継手を提供することにある。 This invention is made | formed in view of such a situation, The objective is to provide the pipe joint which can suppress the torsional moment which acts on the pipe joint and the instrument connected to the pipe joint.
上記課題を解決するための管継手は、内周面に被係合部が形成されてなる外筒部を有した第一流路部材と、外周面に係合部が形成されてなる内筒部を有した第二流路部材と、前記内筒部の内側に挿入されて配置されるインコアと、を備えて、前記外筒部の前記被係合部と前記内筒部の前記係合部とがスナップ係合する態様で前記外筒部に前記内筒部が挿入されて配置されている管継手において、前記第一流路部材と前記第二流路部材とが相対回転可能になっている。 A pipe joint for solving the above-mentioned problems includes a first flow path member having an outer cylinder part in which an engaged part is formed on an inner peripheral surface, and an inner cylinder part in which an engaging part is formed on an outer peripheral surface. A second flow path member having an inner core that is inserted and disposed inside the inner cylinder part, and the engaged part of the outer cylinder part and the engagement part of the inner cylinder part And the first flow path member and the second flow path member are rotatable relative to each other in a pipe joint in which the inner cylinder portion is inserted into the outer cylinder portion in a manner in which the first flow path member and the second flow path member are snap-engaged. .
上記構成によれば、管継手への器具(給水栓や給水管等)の接続に際して、同管継手に第一流路部材と第二流路部材とを相対回転させるような捩りモーメントが作用する場合に、その捩りモーメントを低減するように第一流路部材および第二流路部材を相対回転させることができる。そのため、管継手や同管継手に接続される器具に作用する捩りモーメントを抑えることができるようになる。 According to the above configuration, a torsional moment that relatively rotates the first flow path member and the second flow path member acts on the pipe joint when connecting an instrument (such as a water tap or a water pipe) to the pipe joint. In addition, the first flow path member and the second flow path member can be relatively rotated so as to reduce the torsional moment. Therefore, it becomes possible to suppress the torsional moment acting on the pipe joint and the instrument connected to the pipe joint.
上記管継手において、前記第一流路部材および前記第二流路部材のうちの一方を基準として他方に作用する捩りモーメントが「0.55N・m」以上であるときには、前記第一流路部材と前記第二流路部材とが相対回転するようにすることができる。 In the pipe joint, when the torsional moment acting on the other of the first flow path member and the second flow path member is “0.55 N · m” or more, the first flow path member and the second flow path member The second flow path member can be rotated relative to the second flow path member.
上記管継手において、前記外筒部の内周面と前記内筒部の外周面との間に配置されたシールリングを有することが好ましい。
上記構成によれば、シールリングによって第一流路部材の外筒部の内周面と第二流路部材の内筒部の外周面とが支持されるため、外筒部の中心と内筒部の中心とのずれを抑えるように、それら外筒部および内筒部の相対位置を保持することができる。これにより、外筒部の内周面と内筒部の外周面との片当たりを抑えることができるため、第一流路部材および第二流路部材のスムーズな相対回転を実現することができる。
The pipe joint preferably includes a seal ring disposed between an inner peripheral surface of the outer tube portion and an outer peripheral surface of the inner tube portion.
According to the above configuration, since the inner peripheral surface of the outer cylinder portion of the first flow path member and the outer peripheral surface of the inner cylinder portion of the second flow path member are supported by the seal ring, the center of the outer cylinder portion and the inner cylinder portion The relative positions of the outer cylinder part and the inner cylinder part can be maintained so as to suppress the deviation from the center of the cylinder. Thereby, since the contact | abutting with the inner peripheral surface of an outer cylinder part and the outer peripheral surface of an inner cylinder part can be suppressed, the smooth relative rotation of a 1st flow path member and a 2nd flow path member is realizable.
本発明によれば、管継手や同管継手に接続される器具に作用する捩りモーメントを抑えることができる。 ADVANTAGE OF THE INVENTION According to this invention, the torsion moment which acts on the pipe joint and the instrument connected to the pipe joint can be suppressed.
以下、管継手の一実施形態について説明する。
図1に示すように、管継手1は、金属または樹脂からなる円筒状の第一流路部材2と、その第一流路部材2に係合された樹脂製の第二流路部材3と、その第二流路部材3の第一流路部材2に対する長期間に亘る係合を実現するための金属製または硬質樹脂製のインコア4と、を備えている。なお、この管継手1は呼び径が「13A」の管材の接続に用いられるものである。
Hereinafter, an embodiment of the pipe joint will be described.
As shown in FIG. 1, a pipe joint 1 includes a cylindrical first flow path member 2 made of metal or resin, a resin-made second flow path member 3 engaged with the first flow path member 2, An in-core 4 made of metal or hard resin for realizing long-term engagement of the second flow path member 3 with the first flow path member 2. The pipe joint 1 is used for connecting a pipe material having a nominal diameter of “13A”.
第一流路部材2における一方の端部(図1の下端)側の部分の外周面には、給水栓等の器具に管継手1を接続するための雄ねじ5が形成されている。第一流路部材2におけるもう一方の端部(図1の上端)側の部分には、第二流路部材3を取り付けるための外筒部6が設けられている。 A male thread 5 for connecting the pipe joint 1 to an instrument such as a water tap is formed on the outer peripheral surface of the first flow path member 2 on the one end (lower end in FIG. 1) side. An outer cylinder portion 6 for attaching the second flow path member 3 is provided on the other end (upper end in FIG. 1) side of the first flow path member 2.
第一流路部材2における外筒部6の内周面には、同第一流路部材2の上端側から順に、第二流路部材3と係合される被係合部としての役割を担う内向き爪部7、第二流路部材3の係合部(後述する外向き爪部16)が嵌る嵌合溝8、および、シールリング9を収容した収容溝10が形成されている。 An inner peripheral surface of the outer tube portion 6 in the first flow path member 2 plays a role as an engaged portion that is engaged with the second flow path member 3 in order from the upper end side of the first flow path member 2. A fitting groove 8 into which the facing claw portion 7, an engaging portion (an outward claw portion 16 described later) of the second flow path member 3 is fitted, and a housing groove 10 in which the seal ring 9 is housed are formed.
内向き爪部7は、外筒部6の内周面から第一流路部材2の軸線Lに向って突出するとともに、同外筒部6の内周面の周方向に延びる環状となっている。内向き爪部7における第一流路部材2の上端側の部分の外周面は、第一流路部材2の内奥に向うほど縮径するテーパ面7aになっている。一方、内向き爪部7における第一流路部材2の下端側の部分の外周面は、軸線L方向に同一径で延びる円筒面7bになっている。また、内向き爪部7の下端部は、第一流路部材2の軸線Lと直交する垂直面7cになっている。 The inward claw portion 7 protrudes from the inner peripheral surface of the outer cylindrical portion 6 toward the axis L of the first flow path member 2 and has an annular shape extending in the circumferential direction of the inner peripheral surface of the outer cylindrical portion 6. . An outer peripheral surface of a portion on the upper end side of the first flow path member 2 in the inward claw portion 7 is a tapered surface 7 a that decreases in diameter toward the inner depth of the first flow path member 2. On the other hand, the outer peripheral surface of the portion on the lower end side of the first flow path member 2 in the inward claw portion 7 is a cylindrical surface 7b extending in the axis L direction with the same diameter. Further, the lower end portion of the inward claw portion 7 is a vertical surface 7 c orthogonal to the axis L of the first flow path member 2.
嵌合溝8は、内向き爪部7の垂直面7cが一側壁となるように、同内向き爪部7に隣接して配置されている。嵌合溝8の下端側の部分の外周面は第一流路部材2の内奥(図1の下方)に向うほど縮径するテーパ面8aになっており、嵌合溝8の上端側の部分の外周面は、軸線L方向に同一径で延びる円筒面8bになっている。 The fitting groove 8 is disposed adjacent to the inward claw portion 7 so that the vertical surface 7c of the inward claw portion 7 becomes one side wall. The outer peripheral surface of the lower end portion of the fitting groove 8 is a tapered surface 8a that decreases in diameter toward the inner depth (downward in FIG. 1) of the first flow path member 2, and the upper end portion of the fitting groove 8 The outer peripheral surface is a cylindrical surface 8b extending in the axis L direction with the same diameter.
第二流路部材3は外径の異なる二つの部分(大径部11および内筒部12)を有している。
大径部11は、第二流路部材3における軸線L方向の一方の端部(図1の上端)側の部分をなしている。大径部11の内周面には電熱線コイル13が設けられており、その電熱線コイル13と接続された一対の電極14が大径部11の外周面から外側に突出している。そして、大径部11に樹脂製の給水管を挿入した状態で電熱線コイル13に対し通電を行うことにより、上記給水管と大径部11との接触部分が溶融して互いに接合されるようになっている。
The second flow path member 3 has two parts (a large diameter part 11 and an inner cylinder part 12) having different outer diameters.
The large-diameter portion 11 forms a portion on the one end portion (upper end in FIG. 1) side in the axis L direction of the second flow path member 3. A heating wire coil 13 is provided on the inner peripheral surface of the large diameter portion 11, and a pair of electrodes 14 connected to the heating wire coil 13 protrude outward from the outer peripheral surface of the large diameter portion 11. And by energizing the heating wire coil 13 with the resin water supply pipe inserted into the large diameter portion 11, the contact portion between the water supply pipe and the large diameter portion 11 is melted and joined together. It has become.
内筒部12は、第二流路部材3における軸線L方向のもう一方の端部(図1の下端)側の部分をなしており、第一流路部材2における外筒部6の内側に挿入されて配置されている。この内筒部12の外径は、上記大径部11の外径よりも小さくされており、且つ、第一流路部材2における外筒部6の内径と同じか若干小さくされている。内筒部12の外周面には、第一流路部材2の内向き爪部7(被係合部)とスナップ係合する係合部としての役割を担う外向き爪部16が形成されている。 The inner cylinder portion 12 forms a portion on the other end portion (lower end in FIG. 1) side in the axis L direction of the second flow path member 3 and is inserted inside the outer cylinder section 6 in the first flow path member 2. Has been placed. The outer diameter of the inner cylinder portion 12 is smaller than the outer diameter of the large diameter portion 11 and is the same as or slightly smaller than the inner diameter of the outer cylinder portion 6 in the first flow path member 2. On the outer peripheral surface of the inner cylinder portion 12, an outward claw portion 16 that serves as an engagement portion that snap-engages with the inward claw portion 7 (engaged portion) of the first flow path member 2 is formed. .
外向き爪部16は、内筒部12の外周面の周方向に延びる環状となっている。この外向き爪部16における第二流路部材3の下端側の部分の外周面は、第二流路部材3の下端に向うほど縮径するテーパ面16aになっている。一方、外向き爪部16における第二流路部材3の上端側の部分の外周面は、軸線L方向に同一径で延びる円筒面16bになっている。また、外向き爪部16の上端部は第二流路部材3の軸線Lと直交する垂直面16cになっている。そして、第一流路部材2の外筒部6の内側に第二流路部材3の内筒部12が取り付けられたとき、すなわち外向き爪部16が内向き爪部7とスナップ係合したときには、外向き爪部16の垂直面16cが第一流路部材2の軸線L方向において内向き爪部7の垂直面7cと対向した状態となる。 The outward claw portion 16 has an annular shape extending in the circumferential direction of the outer peripheral surface of the inner cylinder portion 12. The outer peripheral surface of the portion on the lower end side of the second flow path member 3 in the outward claw portion 16 is a tapered surface 16 a that decreases in diameter toward the lower end of the second flow path member 3. On the other hand, the outer peripheral surface of the portion on the upper end side of the second flow path member 3 in the outward claw portion 16 is a cylindrical surface 16b extending with the same diameter in the axis L direction. Further, the upper end portion of the outward claw portion 16 is a vertical surface 16 c that is orthogonal to the axis L of the second flow path member 3. And when the inner cylinder part 12 of the 2nd flow path member 3 is attached inside the outer cylinder part 6 of the 1st flow path member 2, ie, when the outward claw part 16 snap-engages with the inward claw part 7. The vertical surface 16 c of the outward claw portion 16 is in a state of facing the vertical surface 7 c of the inward claw portion 7 in the axis L direction of the first flow path member 2.
この状態のもとでは、第二流路部材3の内筒部12が第一流路部材2の外筒部6から抜けることは、外向き爪部16の垂直面16cと内向き爪部7の垂直面7cとの接触によって防止される。また、この状態のもとでは、第一流路部材2と第二流路部材3とが上記軸線Lを中心に相対回転可能になっており、シールリング9によって外筒部6と内筒部12との間がシールされている。 Under this state, the fact that the inner cylinder portion 12 of the second flow path member 3 comes out of the outer cylinder portion 6 of the first flow path member 2 means that the vertical surface 16c of the outward claw portion 16 and the inward claw portion 7 This is prevented by contact with the vertical surface 7c. Also, under this state, the first flow path member 2 and the second flow path member 3 can be rotated relative to each other about the axis L, and the outer tube portion 6 and the inner tube portion 12 are sealed by the seal ring 9. The space between is sealed.
なお本実施形態では、第一流路部材2および第二流路部材3を相対回転させるように管継手1に作用する回転トルクであって、且つ、それら第一流路部材2および第二流路部材3が実際に相対回転するようになる回転トルクの範囲における最低値を回転可能トルク(本実施形態では、その設計値が0.50[N・m])とする。本実施形態の管継手1では、上記回転可能トルクが、雄ねじ5を用いた接続対象器具(例えば給水栓)への第一流路部材2の接続に際して要求される締め付けトルクよりも小さくなっている。 In addition, in this embodiment, it is the rotational torque which acts on the pipe joint 1 so that the 1st flow path member 2 and the 2nd flow path member 3 may be rotated relatively, and these 1st flow path member 2 and the 2nd flow path member The lowest value in the rotational torque range in which 3 actually rotates relative to each other is assumed to be a rotatable torque (in this embodiment, the design value is 0.50 [N · m]). In the pipe joint 1 of the present embodiment, the above-described rotatable torque is smaller than the tightening torque required when the first flow path member 2 is connected to a connection target instrument (for example, a water tap) using the male screw 5.
また、第一流路部材2の外筒部6に第二流路部材3の内筒部12が取り付けられているときには、第二流路部材3の外向き爪部16が第一流路部材2の嵌合溝8に嵌った状態になっている。そして本実施形態では、第二流路部材3の内筒部12の外周面の形状は、第一流路部材2の外筒部6の内周面における収容溝10が形成された部分を除き、同外筒部6の内周面の形状に対応する形状(詳しくは、ほぼ同一の形状)になっている。 Further, when the inner cylinder portion 12 of the second flow path member 3 is attached to the outer cylinder portion 6 of the first flow path member 2, the outward claw portion 16 of the second flow path member 3 is connected to the first flow path member 2. It is in a state of being fitted in the fitting groove 8. And in this embodiment, the shape of the outer peripheral surface of the inner cylinder part 12 of the 2nd flow path member 3 remove | excludes the part in which the accommodation groove | channel 10 in the inner peripheral surface of the outer cylinder part 6 of the 1st flow path member 2 was formed, The shape corresponds to the shape of the inner peripheral surface of the outer cylindrical portion 6 (specifically, substantially the same shape).
第二流路部材3の内部は、断面円形状で軸線L方向に延びる段付きの貫通孔(第一孔18a、第二孔18b、第三孔18c)になっている。第一孔18aは大径部11の上端側の部分の内部で延びており、第二孔18bは大径部11の下端側の部分の内部および内筒部12の上端側の部分の内部で延びており、第三孔18cは内筒部12の下端側の部分の内部で延びている。この貫通孔は上端側の部分ほど内径が大きくなっている([第一孔18aの内径]>[第二孔18bの内径]>[第三孔18cの内径])。また、第二孔18bの内周面は内筒部12の内周面における外向き爪部16の径方向内方に当たる部分と第一流路部材2の収容溝10(シールリング9)の径方向内方に当たる部分とを含んでいる。 The inside of the second flow path member 3 is a stepped through hole (first hole 18a, second hole 18b, third hole 18c) having a circular cross section and extending in the axis L direction. The first hole 18 a extends inside the upper end portion of the large diameter portion 11, and the second hole 18 b extends inside the lower end portion of the large diameter portion 11 and inside the upper end portion of the inner cylinder portion 12. The third hole 18c extends inside the portion on the lower end side of the inner cylinder portion 12. The inner diameter of the through hole is larger toward the upper end side ([the inner diameter of the first hole 18a]> [the inner diameter of the second hole 18b]> [the inner diameter of the third hole 18c)]. Further, the inner peripheral surface of the second hole 18b is a portion of the inner peripheral surface of the inner cylindrical portion 12 that is inward of the radially inward claw 16 and the radial direction of the receiving groove 10 (seal ring 9) of the first flow path member 2. The part which hits inward is included.
こうした第二流路部材3における内筒部12(詳しくは、第二孔18b)の内側には上記インコア4が挿入されている。このインコア4は筒状をなしており、上記第二孔18bの内側において第二流路部材3の軸線L方向全体に延びている。また、インコア4の上端部にはフランジ17が形成されている。そして、このフランジ17は第二流路部材3の内側における第一孔18aと第二孔18bとの境界部分の段差に接触しており、その接触によってインコア4が内筒部12に対して下端側に相対的に移動しすぎることがないようになっている。インコア4(詳しくは、第二孔18bの内周面と接触する部分)の外径(本実施形態では、直径=12.5mm)は、インコア4や第一流路部材2が取り付けられる前の第二流路部材3の内筒部12(詳しくは、第二孔18b)の内径(本実施形態では、直径=12.4mm)よりも大きい。なお、この大小関係におけるインコア4の外径は図7(a)に示す直径D3のことであり、内筒部12(第二孔18b)の内径は図3(a)に示す直径D4のことである。 The in-core 4 is inserted inside the inner cylinder portion 12 (specifically, the second hole 18b) in the second flow path member 3. The in-core 4 has a cylindrical shape and extends in the axial direction L of the second flow path member 3 inside the second hole 18b. A flange 17 is formed at the upper end of the in-core 4. And this flange 17 is contacting the level | step difference of the boundary part of the 1st hole 18a and the 2nd hole 18b inside the 2nd flow-path member 3, and the in-core 4 is a lower end with respect to the inner cylinder part 12 by the contact. It does not move too much to the side. The outer diameter (in this embodiment, the diameter = 12.5 mm) of the in-core 4 (specifically, the portion in contact with the inner peripheral surface of the second hole 18b) is the first diameter before the in-core 4 and the first flow path member 2 are attached. It is larger than the inner diameter (in this embodiment, the diameter = 12.4 mm) of the inner cylinder portion 12 (specifically, the second hole 18b) of the two flow path member 3. The outer diameter of the in-core 4 in this magnitude relationship is the diameter D3 shown in FIG. 7 (a), and the inner diameter of the inner cylinder portion 12 (second hole 18b) is the diameter D4 shown in FIG. 3 (a). It is.
このインコア4を第二流路部材3における内筒部12の内側に挿入すると、内筒部12における外向き爪部16に対応する部分が縮径方向に変形することが抑制され、ひいては同変形に伴って外向き爪部16と内向き爪部7とのスナップ係合が解除されることが抑制される。したがって、インコア4を第二流路部材3の内筒部12の内側に挿入することにより、外向き爪部16と内向き爪部7とのスナップ係合が強固なものとなり、そのスナップ係合を長期間に亘って維持することができるようになる。 When the in-core 4 is inserted inside the inner cylindrical portion 12 in the second flow path member 3, the portion corresponding to the outward claw portion 16 in the inner cylindrical portion 12 is suppressed from being deformed in the reduced diameter direction, and thus the same deformation. Accordingly, release of the snap engagement between the outward claw portion 16 and the inward claw portion 7 is suppressed. Therefore, by inserting the in-core 4 into the inner cylinder portion 12 of the second flow path member 3, the snap engagement between the outward claw portion 16 and the inward claw portion 7 becomes strong, and the snap engagement Can be maintained over a long period of time.
次に、上述した管継手1を組み立てる手順について詳しく説明する。
管継手1の組み立てに際しては先ず、前工程が実行される。この前工程では、図2(a)に白抜きの矢印で示すように、シールリング9を弾性変形させつつ第一流路部材2の外筒部6の上端側の開口から同外筒部6の内部に挿入する。これにより、図2(b)に示すように、第一流路部材2の外筒部6の収容溝10にシールリング9が収容された状態になる。
Next, the procedure for assembling the pipe joint 1 described above will be described in detail.
In assembling the pipe joint 1, first, a pre-process is performed. In this pre-process, as shown by a white arrow in FIG. 2A, the seal ring 9 is elastically deformed and the opening of the outer cylinder part 6 is opened from the upper end side of the outer cylinder part 6 of the first flow path member 2. Insert inside. Thereby, as shown in FIG. 2B, the seal ring 9 is accommodated in the accommodation groove 10 of the outer cylinder portion 6 of the first flow path member 2.
こうした前工程の後には第一工程が実行される。この第一工程では、図3に示すように、第一流路部材2の外筒部6に対して第二流路部材3の内筒部12を挿入する。これにより、第二流路部材3の内筒部12の外周面に形成された外向き爪部16を、当該内筒部12が樹脂製であることで備える弾性を利用して、第一流路部材2の外筒部6の内周面に形成された内向き爪部7にスナップ係合させる。 After such a pre-process, the first process is performed. In this first step, as shown in FIG. 3, the inner cylindrical portion 12 of the second flow path member 3 is inserted into the outer cylindrical portion 6 of the first flow path member 2. Thereby, using the elasticity provided with the outward nail | claw part 16 formed in the outer peripheral surface of the inner cylinder part 12 of the 2nd flow path member 3 by the said inner cylinder part 12 being resin, the 1st flow path The member 2 is snap-engaged with an inward claw portion 7 formed on the inner peripheral surface of the outer cylinder portion 6 of the member 2.
詳しくは先ず、図3(a)に白抜きの矢印で示すように、第二流路部材3の内筒部12を、第一流路部材2の外筒部6の一方の端部(図3(a)の上端)から同外筒部6の内部に挿入する。これにより、図3(b)に示すように、第二流路部材3の外向き爪部16のテーパ面16aが第一流路部材2の内向き爪部7のテーパ面7aに接触するようになる。 Specifically, first, as indicated by a white arrow in FIG. 3A, the inner cylinder portion 12 of the second flow path member 3 is connected to one end portion of the outer cylinder portion 6 of the first flow path member 2 (FIG. 3). It is inserted into the outer cylinder part 6 from the upper end of (a). Thereby, as shown in FIG. 3B, the tapered surface 16 a of the outward claw portion 16 of the second flow path member 3 is in contact with the tapered surface 7 a of the inward claw portion 7 of the first flow path member 2. Become.
そして、上記テーパ面16a,7a同士の接触後も、第一流路部材2の外筒部6の内部に第二流路部材3の内筒部12を圧入するように、それら第一流路部材2および第二流路部材3を互いに近づく方向に押圧する。このとき内筒部12における外向き爪部16に対応する部分がテーパ面7aに押されて縮径するように変形する。 And even after the taper surfaces 16a and 7a are in contact with each other, the first flow path member 2 so as to press-fit the inner cylinder part 12 of the second flow path member 3 into the outer cylinder part 6 of the first flow path member 2. And the 2nd flow path member 3 is pressed in the direction which mutually approaches. At this time, a portion of the inner cylinder portion 12 corresponding to the outward claw portion 16 is deformed so as to be reduced in diameter by being pushed by the tapered surface 7a.
その後、図3(c)に示すように、第二流路部材3の外向き爪部16が第一流路部材2の内向き爪部7を乗り越えると、第二流路部材3の内筒部12における外向き爪部16に対応する部分が上記変形に伴う反発力によって同変形から復元(拡径)する。この変形からの復元により、外向き爪部16の垂直面16cと内向き爪部7の垂直面7cとが対向した状態となって、第二流路部材3の外向き爪部16が第一流路部材2の内向き爪部7に対してスナップ係合されるようになる。 Thereafter, as shown in FIG. 3C, when the outward claw portion 16 of the second flow path member 3 gets over the inward claw portion 7 of the first flow path member 2, the inner cylindrical portion of the second flow path member 3. The portion corresponding to the outward claw portion 16 in 12 is restored (expanded) from the deformation by the repulsive force accompanying the deformation. By restoration from this deformation, the vertical surface 16c of the outward claw portion 16 and the vertical surface 7c of the inward claw portion 7 face each other, and the outward claw portion 16 of the second flow path member 3 is in the first flow. It comes to be snap-engaged with the inward claw portion 7 of the road member 2.
こうした第一工程の後には第二工程が実行される。この第二工程では、図4に示す拡径治具20を、図3(c)に示す状態の第二流路部材3の内筒部12の内部に挿入する。
図4に示すように、上記拡径治具20は段付きの円柱状をなしている。詳しくは、拡径治具20は、一方側(図4の下方側)の部分が小径の挿入部21をなしており、他方側(図4の上方側)の部分が比較的大径の基部22をなしている。また拡径治具20における挿入部21と基部22との境界部分は、同拡径治具20の軸線と直交するストッパ面23になっている。拡径治具20の挿入部21の外径(本実施形態では、直径=13.2mm)は、インコア4の外径(本実施形態では、直径=12.5mm)よりも大きくなっている。
After such a first step, a second step is performed. In the second step, the diameter expansion jig 20 shown in FIG. 4 is inserted into the inner cylinder portion 12 of the second flow path member 3 in the state shown in FIG.
As shown in FIG. 4, the diameter expansion jig 20 has a stepped columnar shape. Specifically, in the diameter expanding jig 20, a portion on one side (lower side in FIG. 4) forms a small diameter insertion portion 21, and a portion on the other side (upper side in FIG. 4) has a relatively large diameter base. 22 is made. The boundary portion between the insertion portion 21 and the base portion 22 in the diameter expansion jig 20 is a stopper surface 23 that is orthogonal to the axis of the diameter expansion jig 20. The outer diameter of the insertion portion 21 of the diameter expanding jig 20 (diameter = 13.2 mm in this embodiment) is larger than the outer diameter of the in-core 4 (diameter = 12.5 mm in this embodiment).
そして、第二工程では、図5に示すように、拡径治具20のストッパ面23が第二流路部材3の軸線方向における大径部11側(図5の上方側)の端面に突き当たる位置まで、拡径治具20の挿入部21を内筒部12の内部に挿入する。これにより、拡径治具20の挿入部21の先端が第二流路部材3の内筒部12の外向き爪部16の径方向内方に到達する位置まで、拡径治具20の挿入部21が内筒部12の内部に挿入される。このとき拡径治具20の挿入部21が第二流路部材3の第二孔18bの途中まで挿入されるため、挿入部21が挿入された部分では第二孔18bの内径が同挿入部21によって直接押し広げられるようになる。第二工程では、第二孔18bにおける内径が直接押し広げられる部分が収容溝10(シールリング9)の径方向内方に当たる部分よりも拡径治具20の挿入方向(図5の下方向)における手前側の部分になる態様で、拡径治具20の挿入部21が内筒部12の内部に挿入される。 In the second step, as shown in FIG. 5, the stopper surface 23 of the diameter expanding jig 20 abuts against the end surface of the second flow path member 3 on the large diameter portion 11 side (upper side in FIG. 5). The insertion part 21 of the diameter expansion jig 20 is inserted into the inner cylinder part 12 up to the position. As a result, the insertion of the diameter expansion jig 20 to the position where the tip of the insertion part 21 of the diameter expansion jig 20 reaches the radially inward direction of the outward claw part 16 of the inner cylinder part 12 of the second flow path member 3. The part 21 is inserted into the inner cylinder part 12. At this time, since the insertion portion 21 of the diameter expanding jig 20 is inserted partway through the second hole 18b of the second flow path member 3, the inner diameter of the second hole 18b is the same at the portion where the insertion portion 21 is inserted. 21 will be spread directly. In the second step, the portion in which the inner diameter of the second hole 18b is directly pushed and expanded is the insertion direction of the diameter-expanding jig 20 (downward in FIG. 5) rather than the portion where the inner portion of the receiving groove 10 (seal ring 9) hits radially inward. The insertion portion 21 of the diameter expansion jig 20 is inserted into the inner cylinder portion 12 in a manner that becomes a portion on the near side.
こうした第二工程の後には第三工程が実行される。この第三工程では、図6に示すように、第二工程において第二流路部材3の内筒部12に挿入した拡径治具20(図5参照)を、同内筒部12の内部から引き抜いて取り出す。 After the second step, the third step is performed. In this third step, as shown in FIG. 6, the diameter expansion jig 20 (see FIG. 5) inserted into the inner cylindrical portion 12 of the second flow path member 3 in the second step is used inside the inner cylindrical portion 12. Pull out and remove.
第三工程の後には第四工程が実行される。この第四工程では、図7に示すように、インコア4を第二流路部材3の内筒部12の内部に挿入して配置する。第四工程では、詳しくは、図7(a)に白抜きの矢印で示すように、インコア4が内筒部12の内部に挿入される。そして、図7(b)に示すように、インコア4のフランジ17が第二流路部材3の大径部11と内筒部12との境界部分に突き当たる位置まで挿入されると、内筒部12内へのインコア4の挿入が完了する。これにより、インコア4は、第二流路部材3の内筒部12の内周面における外向き爪部16の径方向内方に当たる部分を含む部分に挿入された状態となる。 After the third step, the fourth step is performed. In the fourth step, as shown in FIG. 7, the in-core 4 is inserted and arranged inside the inner cylinder portion 12 of the second flow path member 3. Specifically, in the fourth step, the in-core 4 is inserted into the inner cylindrical portion 12 as indicated by a white arrow in FIG. Then, as shown in FIG. 7B, when the flange 17 of the in-core 4 is inserted to a position where it comes into contact with the boundary portion between the large-diameter portion 11 and the inner tube portion 12 of the second flow path member 3, the inner tube portion The insertion of the in-core 4 into the 12 is completed. Thereby, the in-core 4 is in a state of being inserted into a portion including a portion corresponding to the radially inner side of the outward claw portion 16 on the inner peripheral surface of the inner cylinder portion 12 of the second flow path member 3.
次に、上述のように管継手1を組み立てることによる作用について説明する。
本実施形態の管継手1では、図3(c)に示すように、第一流路部材2の外筒部6への第二流路部材3の内筒部12の挿入に伴って同内筒部12における外向き爪部16の形成部分やその周辺が縮径方向に変形するようになる。このとき内筒部12の外向き爪部16の一部やその周辺部分が同内筒部12の挿入方向における後方側(図3(c)の上方側)に倒れ込むように変形するなど、内筒部12の外形が不規則に変形する。そのため、第一流路部材2の外筒部6に第二流路部材3の内筒部12を挿入した後において、内筒部12の外周面と外筒部6の内周面とが片当たりするおそれがある。
Next, the effect | action by assembling the pipe joint 1 as mentioned above is demonstrated.
In the pipe joint 1 of the present embodiment, as shown in FIG. 3C, the inner cylinder is inserted along with the insertion of the inner cylinder part 12 of the second flow path member 3 into the outer cylinder part 6 of the first flow path member 2. A portion where the outward claw portion 16 is formed in the portion 12 and its periphery are deformed in the direction of diameter reduction. At this time, a part of the outward claw part 16 of the inner cylinder part 12 and its peripheral part are deformed so as to fall down to the rear side (upper side in FIG. 3C) in the insertion direction of the inner cylinder part 12. The outer shape of the cylindrical portion 12 is irregularly deformed. Therefore, after inserting the inner cylinder part 12 of the second flow path member 3 into the outer cylinder part 6 of the first flow path member 2, the outer peripheral surface of the inner cylinder part 12 and the inner peripheral surface of the outer cylinder part 6 contact each other. There is a risk.
本実施形態の管継手1は、第一流路部材2と第二流路部材3とが相対回転可能になっている。そのため、上述のように第一流路部材2の外筒部6の内周面と第二流路部材3の内筒部12の外周面とが片当たりしてしまうと、それら第一流路部材2および第二流路部材3を相対回転させるために必要な回転トルクが不要に大きくなってしまう。 In the pipe joint 1 of the present embodiment, the first flow path member 2 and the second flow path member 3 are relatively rotatable. Therefore, when the inner peripheral surface of the outer cylinder portion 6 of the first flow path member 2 and the outer peripheral surface of the inner cylinder portion 12 of the second flow path member 3 are in contact with each other as described above, these first flow path members 2 are used. And the rotational torque required in order to make the 2nd flow path member 3 rotate relatively will become large unnecessarily.
ただし、本実施形態では、内筒部12の外向き爪部16と外筒部6の内向き爪部7とをスナップ係合させた後の第二工程において、内筒部12の内部にインコア4よりも大径の拡径治具20(詳しくは、その挿入部21)が挿入される。これにより、図5に示すように、第二流路部材3の内筒部12が拡径するように変形して、外向き爪部16を有する内筒部12の外周面が内向き爪部7および嵌合溝8を有する外筒部6の内周面に押し付けられるようになる。 However, in this embodiment, in the second step after the outward claw portion 16 of the inner cylinder portion 12 and the inward claw portion 7 of the outer cylinder portion 6 are snap-engaged, the inner core portion 12 is in-core. The diameter-expanding jig 20 having a diameter larger than 4 (specifically, its insertion portion 21) is inserted. As a result, as shown in FIG. 5, the inner cylindrical portion 12 of the second flow path member 3 is deformed so as to expand in diameter, and the outer peripheral surface of the inner cylindrical portion 12 having the outward claw portion 16 is inwardly directed claw portion. 7 and the inner circumferential surface of the outer cylinder portion 6 having the fitting groove 8.
上述したように第二流路部材3の内筒部12の外周面の形状は、第一流路部材2の外筒部6の内周面における収容溝10が形成された部分を除き、同外筒部6の内周面の形状に対応する形状(ほぼ同一の形状)になっている。そのため、第二工程において内筒部12の外周面が外筒部6の内周面に押し付けられることによって、同内筒部12の外形を外筒部6の内周面に倣う形状に再形成することができる。 As described above, the shape of the outer peripheral surface of the inner cylindrical portion 12 of the second flow path member 3 is the same as that of the outer peripheral portion except for the portion where the accommodation groove 10 is formed on the inner peripheral surface of the outer cylindrical portion 6 of the first flow path member 2. It has a shape (substantially the same shape) corresponding to the shape of the inner peripheral surface of the cylindrical portion 6. Therefore, in the second step, the outer peripheral surface of the inner cylindrical portion 12 is pressed against the inner peripheral surface of the outer cylindrical portion 6, so that the outer shape of the inner cylindrical portion 12 is reshaped to follow the inner peripheral surface of the outer cylindrical portion 6. can do.
さらに、その後の第三工程および第四工程では、第二流路部材3の内筒部12の内部から拡径治具20が引き抜かれるとともに同拡径治具20の挿入部21よりも外径の小さいインコア4が内筒部12の内側に挿入されて配置される。そのため、外形が再形成された状態の内筒部12が自身の弾性によって縮径(復元)するように、すなわち外筒部6の内周面から離間する方向に変形するようになる。 Further, in the subsequent third step and fourth step, the diameter expansion jig 20 is pulled out from the inside of the inner tube portion 12 of the second flow path member 3 and the outer diameter is larger than the insertion portion 21 of the diameter expansion jig 20. The small in-core 4 is inserted and arranged inside the inner cylinder portion 12. Therefore, the inner cylinder part 12 in a state in which the outer shape is reshaped is deformed so as to be reduced in diameter (restored) by its own elasticity, that is, in a direction away from the inner peripheral surface of the outer cylinder part 6.
このように本実施形態によれば、第二流路部材3の内筒部12への拡径治具20の挿入を通じて同内筒部12の外形を外筒部6の内周面に倣う形状に再形成するとともに、その後に内筒部12から拡径治具20を引き抜くことによって内筒部12の全体を外径が小さくなるように変形させることができる。これにより、第二流路部材3の内筒部12の外周面の一部が第一流路部材2の外筒部6の内周面に片当たりすることが抑えられるようになる。したがって、規定の小トルク(例えば、0.55N・m程度)で第一流路部材2および第二流路部材3を相対回転させることの可能な管継手1を容易に形成することができる。 As described above, according to the present embodiment, the outer shape of the inner cylindrical portion 12 follows the inner peripheral surface of the outer cylindrical portion 6 through the insertion of the diameter expanding jig 20 into the inner cylindrical portion 12 of the second flow path member 3. Then, by pulling out the diameter expansion jig 20 from the inner cylinder part 12 after that, the entire inner cylinder part 12 can be deformed so that the outer diameter becomes smaller. As a result, a part of the outer peripheral surface of the inner cylindrical portion 12 of the second flow path member 3 can be prevented from hitting the inner peripheral surface of the outer cylindrical portion 6 of the first flow path member 2. Therefore, it is possible to easily form the pipe joint 1 capable of relatively rotating the first flow path member 2 and the second flow path member 3 with a specified small torque (for example, about 0.55 N · m).
管継手1は、第一流路部材2の外筒部の内周面と第二流路部材3の内筒部12の外周面との間に配置されたシールリング9を有している。このシールリング9によって外筒部6の内周面と内筒部12の外周面とが支持されるため、外筒部6の軸線と内筒部12の軸線とのずれを抑えるように、それら外筒部6および内筒部12の相対位置を保持することができる。これによっても、外筒部6の内周面と内筒部12の外周面との片当たりを抑えることができるため、第一流路部材2および第二流路部材3のスムーズな相対回転を実現することができる。 The pipe joint 1 has a seal ring 9 disposed between the inner peripheral surface of the outer cylinder portion of the first flow path member 2 and the outer peripheral surface of the inner cylinder portion 12 of the second flow path member 3. The seal ring 9 supports the inner peripheral surface of the outer cylinder portion 6 and the outer peripheral surface of the inner cylinder portion 12, so that the displacement between the axis of the outer cylinder portion 6 and the axis of the inner cylinder portion 12 is suppressed. The relative positions of the outer cylinder part 6 and the inner cylinder part 12 can be maintained. Also by this, since the contact between the inner peripheral surface of the outer cylindrical portion 6 and the outer peripheral surface of the inner cylindrical portion 12 can be suppressed, smooth relative rotation of the first flow path member 2 and the second flow path member 3 is realized. can do.
本実施形態では、第二工程において、拡径治具20の挿入部21が第二流路部材3の第二孔18bの途中まで挿入されるようになっている。そのため、第三工程において拡径治具20を引き抜いた後に、第二孔18bにおける上記拡径治具20の挿入方向(図6の下方向)の奥側には内径が拡径されていない部分、すなわちインコア4の外径(直径=12.5mm)よりも内径の小さい部分(内径=12.4mm)が残る。これにより、図7に示すように、第四工程では、第二孔18bにおける内径の小さい部分にインコア4の一部が圧入されるようになるため、同インコア4が第二孔18b(第二流路部材3)から脱落することが抑えられるようになる。 In the present embodiment, in the second step, the insertion portion 21 of the diameter expansion jig 20 is inserted partway through the second hole 18 b of the second flow path member 3. Therefore, after the diameter expansion jig 20 is pulled out in the third step, the inner diameter is not expanded on the back side of the second hole 18b in the insertion direction of the diameter expansion jig 20 (downward in FIG. 6). That is, a portion (inner diameter = 12.4 mm) having an inner diameter smaller than the outer diameter (diameter = 12.5 mm) of the in-core 4 remains. As a result, as shown in FIG. 7, in the fourth step, a part of the incore 4 is press-fitted into a portion having a small inner diameter in the second hole 18b. It is possible to suppress the dropout from the flow path member 3).
ここで、雄ねじ5を用いて管継手1を接続対象器具(例えば給水栓)に接続する際には、第一流路部材2が回転することによって、管継手1に捩りモーメントが付与されることがある。仮に、そうした捩りモーメントが付与された状態のままで管継手1が接続対象器具に固定されてしまうと、その固定後において接続対象器具や管継手1、同管継手1に固定された給水管に内部応力が生じてしまい、管継手1を含む配管構造の信頼性の低下を招くおそれがある。 Here, when the pipe joint 1 is connected to a connection target instrument (for example, a water faucet) using the male screw 5, a torsional moment may be applied to the pipe joint 1 by the rotation of the first flow path member 2. is there. If the pipe joint 1 is fixed to the connection target instrument in a state where such a torsional moment is applied, the connection target instrument, the pipe joint 1, and the water supply pipe fixed to the pipe joint 1 are fixed after the fixing. Internal stress is generated, and there is a possibility that the reliability of the piping structure including the pipe joint 1 is lowered.
この点、本実施形態の管継手1では、同管継手1に付与されることによって第一流路部材2および第二流路部材3が実際に相対回転するようになる回転トルク範囲の最低値(前記回転可能トルク)が、雄ねじ5を用いた接続対象器具への第一流路部材2の接続に際して要求される締め付けトルクよりも小さくなっている。そのため、管継手1の接続対象器具への接続に際して管継手1に上記捩りモーメントが付与される場合であっても、その接続が完了する前に、管継手1に付与される接続のための回転トルクが上記回転可能トルクを上回り、第一流路部材2および第二流路部材3が相対回転するようになる。これにより、管継手1や接続対象器具に捩りモーメントが作用することを抑えることができる。しかも、管継手1の接続対象器具への接続後において管継手1や接続対象器具に内部応力が残留した状態になることも抑えられるために、管継手1を含む配管構造を信頼性の高いものにすることができる。 In this regard, in the pipe joint 1 of the present embodiment, the lowest value of the rotational torque range in which the first flow path member 2 and the second flow path member 3 are actually relatively rotated by being applied to the pipe joint 1 ( The rotation torque) is smaller than the tightening torque required when the first flow path member 2 is connected to the connection target instrument using the male screw 5. Therefore, even when the torsional moment is applied to the pipe joint 1 when the pipe joint 1 is connected to the connection object tool, the rotation for connection applied to the pipe joint 1 is completed before the connection is completed. The torque exceeds the rotatable torque, and the first flow path member 2 and the second flow path member 3 rotate relative to each other. Thereby, it can suppress that a torsion moment acts on the pipe joint 1 or a connection object instrument. In addition, since it is possible to prevent the internal stress from remaining in the pipe joint 1 or the connection target instrument after the pipe joint 1 is connected to the connection target instrument, the piping structure including the pipe joint 1 is highly reliable. Can be.
以下、拡径治具20を用いずに管継手1の組み立てを行う場合について考察する。
拡径治具20を用いずに管継手1を組み立てた場合であっても、内筒部12の外向き爪部16と外筒部6の内向き爪部7とをスナップ係合させた後に内筒部12の内部にインコア4を挿入して配置することにより、内筒部12は変形(拡径)するようになる。しかも、内筒部12の形状は、第二流路部材3の内筒部12が有する弾性によって、組み立て完了後における時間経過とともに復元(縮径)するようになる。そして、この復元に伴って、上記回転可能トルクは徐々に小さくなることが推測される。
Hereinafter, the case where the pipe joint 1 is assembled without using the diameter expansion jig 20 will be considered.
Even when the pipe joint 1 is assembled without using the diameter expansion jig 20, after the outward claw portion 16 of the inner cylinder portion 12 and the inward claw portion 7 of the outer cylinder portion 6 are snap-engaged. By inserting and placing the in-core 4 inside the inner cylinder portion 12, the inner cylinder portion 12 is deformed (expanded diameter). Moreover, the shape of the inner cylinder portion 12 is restored (reduced in diameter) with the passage of time after completion of the assembly due to the elasticity of the inner cylinder portion 12 of the second flow path member 3. With this restoration, it is estimated that the rotatable torque gradually decreases.
発明者は、拡径治具20を用いずに管継手1の組み立てを行うとともに、その後の経過時間と同管継手1の上記回転可能トルクとの関係を測定する実験を行った。そして、この実験結果から、拡径治具20を使用せずに管継手1を組み立てた場合であっても、その組み立て後に二年半程度が経過することにより、上記回転可能トルクの設計値(0.50[N・m])と実値との差が、使用者が差異を感じなくなる程度(例えば、設計値と実値との差が0.20[N・m]になる程度)に小さくなることが分かった。このように、拡径治具20を使用せずに管継手1を組み立てた場合には、上記回転可能トルクが適度に小さくなる程度に第二流路部材3の形状が復元するようになるまでには長い時間がかかってしまう。 The inventor conducted an experiment for assembling the pipe joint 1 without using the diameter expansion jig 20 and measuring the relationship between the elapsed time and the above-described rotatable torque of the pipe joint 1. And even if it is a case where the pipe joint 1 is assembled without using the diameter expansion jig 20 from this experimental result, about two and a half years pass after the assembly, the design value ( 0.50 [N · m]) and the actual value are such that the user feels no difference (for example, the difference between the design value and the actual value is 0.20 [N · m]). It turned out to be smaller. Thus, when the pipe joint 1 is assembled without using the diameter expansion jig 20, until the shape of the second flow path member 3 is restored to such an extent that the rotatable torque is appropriately reduced. Takes a long time.
管継手1は第一流路部材2と第二流路部材3とが相対回転可能な構造になっているため、その出荷前における機能確認のために、個々の管継手1の回転可能トルクを測定する検査を行うことが望ましい。こうした検査を行う場合には、拡径治具20を用いずに管継手1を組み立てるようにすると、その組み立てに伴って管継手1の回転可能トルクが大きくなった状態で上記検査を行わざるを得なくなるため、その検査を適正に行うことができなくなってしまう。この点、上述したように管継手1を組み立てることにより、組み立て完了後の早い時期から第一流路部材2および第二流路部材3を小トルクで相対回転させることの可能な状態になるため、上記検査を適正に行うことができるようになる。 Since the pipe joint 1 has a structure in which the first flow path member 2 and the second flow path member 3 can rotate relative to each other, the rotational torque of each pipe joint 1 is measured in order to confirm the function before shipment. It is desirable to perform an inspection. When performing such an inspection, if the pipe joint 1 is assembled without using the diameter expansion jig 20, the above inspection should be performed in a state where the rotatable torque of the pipe joint 1 has increased with the assembly. Since it cannot be obtained, the inspection cannot be performed properly. In this regard, by assembling the pipe joint 1 as described above, the first flow path member 2 and the second flow path member 3 can be relatively rotated with a small torque from an early stage after the assembly is completed. The above inspection can be performed properly.
次に、インコアとして大径のもの(直径=13.2mm)を採用した場合における管継手1の回転可能トルクについて考察する。
発明者は、拡径治具20(挿入部21の直径=13.2mm)を第二流路部材3の内筒部12に挿入したままの状態で上記回転可能トルクを測定する実験を行った。その結果、この状態での管継手1の回転可能トルクは、小径のインコア4(直径=12.5mm)を採用した場合と比較して、大きい値(2.40[N・m])になることが分かった。
Next, consideration will be given to the rotatable torque of the pipe joint 1 when an in-core one having a large diameter (diameter = 13.2 mm) is employed.
The inventor conducted an experiment to measure the rotatable torque with the diameter expansion jig 20 (the diameter of the insertion portion 21 = 13.2 mm) being inserted into the inner cylindrical portion 12 of the second flow path member 3. . As a result, the rotatable torque of the pipe joint 1 in this state is a larger value (2.40 [N · m]) than when the small-diameter incore 4 (diameter = 12.5 mm) is employed. I understood that.
このことから、単に外径の大きいインコアを採用して、第二流路部材3の内筒部12を拡径させてその外形を整えたとしても、上記回転可能トルクを低下させることができないことが推測される。これは、外径の大きいインコアを圧入して第二流路部材3の内筒部12を拡径させた状態では、同内筒部12の外周面が第一流路部材2の外筒部6の内周面に押し付けられたまま復元(縮径)できずに上記回転可能トルクが高くなるためと考えられる。 For this reason, even if an in-core having a large outer diameter is simply adopted and the inner cylinder portion 12 of the second flow path member 3 is expanded in diameter to adjust its outer shape, the above-described rotatable torque cannot be reduced. Is guessed. In the state where the in-core having a large outer diameter is press-fitted and the inner cylinder part 12 of the second flow path member 3 is expanded in diameter, the outer peripheral surface of the inner cylinder part 12 is the outer cylinder part 6 of the first flow path member 2. This is considered to be because the above-described rotatable torque is increased without being able to be restored (reduced diameter) while being pressed against the inner peripheral surface.
こうしたことから、管継手1の回転可能トルクの増大を抑えるためには、単に第二流路部材3の内筒部12に大径の拡径治具20を挿入するだけでなく(第二工程)、同内筒部12から拡径治具20を引き抜くとともに(第三工程)、内筒部12の内側に拡径治具20よりも小径のインコア4を挿入して配置する(第四工程)ことが重要であると云える。 For this reason, in order to suppress an increase in the rotatable torque of the pipe joint 1, not only the large diameter expanding jig 20 is inserted into the inner cylinder portion 12 of the second flow path member 3 (second step). ), Pulling out the diameter-enlarging jig 20 from the inner cylinder part 12 (third process), and inserting and arranging the in-core 4 having a smaller diameter than the diameter-enlarging jig 20 inside the inner cylinder part 12 (fourth process). ) Is important.
次に、管継手1の組み立てに用いられる拡径治具20の挿入部21の外径と、組み立て完了後の管継手1の回転可能トルクとの関係について考察する。
発明者は、挿入部の外径が異なる複数の拡径治具を用いて管継手1の組み立てを行うとともに、組み立て完了後の各管継手1の上記回転可能トルクを測定する実験を行った。その測定結果を図8に示す。なお図8に示す各測定データL1(挿入部21の直径=12.5mm),L2(同12.8mm),L3(同13.0mm),L4(同13.2mm),L5(同13.4mm),L6(同13.6mm)は、サンプル数が「4」であり、その平均値を示している。ちなみに、各測定データL1〜L6についてのサンプル数を増やすことにより、各測定データは時間経過とともに共通の値に収束する滑らかな曲線になると考えられる。
Next, the relationship between the outer diameter of the insertion portion 21 of the diameter expansion jig 20 used for assembling the pipe joint 1 and the rotatable torque of the pipe joint 1 after the assembly will be considered.
The inventor conducted an experiment of assembling the pipe joint 1 using a plurality of diameter expanding jigs having different outer diameters of the insertion portions and measuring the rotatable torque of each pipe joint 1 after the completion of the assembly. The measurement results are shown in FIG. In addition, each measurement data L1 (diameter of the insertion part = 12.5 mm), L2 (12.8 mm), L3 (13.0 mm), L4 (13.2 mm), L5 (13. 4 mm) and L6 (13.6 mm) have a sample number of “4” and indicate an average value thereof. By the way, by increasing the number of samples for each measurement data L1 to L6, it is considered that each measurement data becomes a smooth curve that converges to a common value as time passes.
図8から明らかなように、拡径治具として挿入部の外径がインコア4の外径よりも大きいものを用いることにより(測定データL2〜L6)、挿入部の外径がインコア4の外径と等しい拡径治具を採用する場合と比較して(測定データL1)、組み立て完了直後における管継手1の回転可能トルクが低減されるようになる。 As is clear from FIG. 8, by using a diameter expansion jig whose outer diameter of the insertion portion is larger than the outer diameter of the in-core 4 (measurement data L2 to L6), the outer diameter of the insertion portion is the outer diameter of the in-core 4. Compared with the case where a diameter expansion jig equal to the diameter is employed (measurement data L1), the rotatable torque of the pipe joint 1 immediately after the assembly is completed is reduced.
また、管継手1の組み立てに用いる拡径治具の挿入部の外径を徐々に大きくしてくと(12.8mm[測定データL2]→13.0mm[同L3]→13.2mm[同L4])、それに連れて管継手1の回転可能トルクは徐々に小さくなり、挿入部21の外径が13.2mm(測定データL4)である場合に回転可能トルクが最も小さくなる。 Further, when the outer diameter of the insertion portion of the diameter expansion jig used for assembling the pipe joint 1 is gradually increased (12.8 mm [measurement data L2] → 13.0 mm [same L3] → 13.2 mm [same L4] ]) Accordingly, the rotatable torque of the pipe joint 1 gradually decreases. When the outer diameter of the insertion portion 21 is 13.2 mm (measurement data L4), the rotatable torque becomes the smallest.
さらに拡径治具の挿入部の外径を13.2mmを超えて大きくしていくと(13.4mm[測定データL5]→13.6mm[同L6])、それに連れて管継手1の回転可能トルクは徐々に大きくなる。これは、第二流路部材3の内筒部12への拡径治具の挿入部の挿入に伴って同内筒部12が拡径されすぎてしまい、内筒部12が復元(縮径)し難くなって内筒部12の外周面と外筒部6の内周面との嵌め合い度合いが大きいままとなってしまうためと考えられる。 When the outer diameter of the insertion portion of the diameter expansion jig is further increased beyond 13.2 mm (13.4 mm [measurement data L5] → 13.6 mm [same L6]), the rotation of the pipe joint 1 is accordingly performed. The possible torque gradually increases. This is because the inner cylindrical portion 12 is excessively expanded with the insertion of the insertion portion of the diameter expansion jig into the inner cylindrical portion 12 of the second flow path member 3, and the inner cylindrical portion 12 is restored (reduced diameter). This is considered to be because the degree of fitting between the outer peripheral surface of the inner cylindrical portion 12 and the inner peripheral surface of the outer cylindrical portion 6 remains large.
図8に示す実験結果から以下の(事項A)〜(事項C)に記載の事項が確認された。なお以下の(事項A)〜(事項C)では、拡径治具の挿入部の外径D1をインコア4の外径D2で除算した値をV(=D1/D2)とする。
(事項A)値Vが関係式「V>1.00」を満たす場合には、同値Vが「1.00」である場合と比較して、組み立て完了直後の管継手1の回転可能トルクが小さくなる。
(事項B)値Vが関係式「1.025≦V≦1.075」を満たす場合には、組み立て完了直後の管継手1の回転可能トルクが好適に小さくなる。
(事項C)値Vが「1.050」程度の値になる場合に、組み立て完了直後の管継手1の回転可能トルクが最も小さくなる。
The items described in (Item A) to (Item C) below were confirmed from the experimental results shown in FIG. In the following (Item A) to (Item C), a value obtained by dividing the outer diameter D1 of the insertion portion of the diameter expansion jig by the outer diameter D2 of the in-core 4 is V (= D1 / D2).
(Item A) When the value V satisfies the relational expression “V> 1.00”, compared to the case where the value V is “1.00”, the rotatable torque of the pipe joint 1 immediately after the assembly is completed is Get smaller.
(Item B) When the value V satisfies the relational expression “1.025 ≦ V ≦ 1.075”, the rotatable torque of the pipe joint 1 immediately after completion of the assembly is suitably reduced.
(Item C) When the value V becomes a value of about “1.050”, the rotatable torque of the pipe joint 1 immediately after the completion of the assembly becomes the smallest.
本実施形態では、こうした実験結果をもとに、拡径治具20の挿入部21の外径(直径)を「13.2mm」にし、インコア4の外径(直径)を「12.5mm」にしている。これにより、組み立て完了後の早い時期において規定の小トルクで第一流路部材2および第二流路部材3を相対回転させることが可能になる管継手1を、容易に形成することができるようになる。 In the present embodiment, based on such experimental results, the outer diameter (diameter) of the insertion portion 21 of the diameter expansion jig 20 is set to “13.2 mm”, and the outer diameter (diameter) of the in-core 4 is set to “12.5 mm”. I have to. Thus, the pipe joint 1 that can relatively rotate the first flow path member 2 and the second flow path member 3 with a specified small torque at an early stage after the assembly is completed can be easily formed. Become.
以上説明したように、本実施形態によれば、以下に記載する効果が得られる。
(1)第一流路部材2と第二流路部材3とが相対回転可能になっているため、管継手1や接続対象器具に作用する捩りモーメントを抑えることができる。
As described above, according to the present embodiment, the following effects can be obtained.
(1) Since the first flow path member 2 and the second flow path member 3 are capable of relative rotation, the torsional moment acting on the pipe joint 1 and the connection target instrument can be suppressed.
(2)第一流路部材2の外筒部6の内周面と第二流路部材3の内筒部12の外周面との間にシールリング9を配置した。これにより、外筒部6の内周面と内筒部12の外周面との片当たりを抑えることができるため、第一流路部材2および第二流路部材3のスムーズな相対回転を実現することができる。 (2) The seal ring 9 is disposed between the inner peripheral surface of the outer cylinder portion 6 of the first flow path member 2 and the outer peripheral surface of the inner cylinder portion 12 of the second flow path member 3. Thereby, since the contact | abutting with the inner peripheral surface of the outer cylinder part 6 and the outer peripheral surface of the inner cylinder part 12 can be suppressed, the smooth relative rotation of the 1st flow path member 2 and the 2nd flow path member 3 is implement | achieved. be able to.
<変形例>
なお、上記実施形態は、以下のように変更して実施してもよい。
・第二工程において、第二流路部材3の内筒部12の内部への拡径治具20の挿入部21の挿入を、挿入部21の先端が内筒部12の外向き爪部16の径方向内方に到達しない位置までに留める態様で行うようにしてもよい。要は、インコア4よりも外径の大きい挿入部21を有する拡径治具20を第二流路部材3の内筒部12の内部に挿入することができればよい。
<Modification>
The above embodiment may be modified as follows.
In the second step, the insertion portion 21 of the diameter expansion jig 20 is inserted into the inner cylinder portion 12 of the second flow path member 3, and the distal end of the insertion portion 21 faces the outward claw portion 16 of the inner cylinder portion 12. You may make it carry out in the aspect fastened to the position which does not reach inward in the radial direction. In short, it is only necessary that the diameter expansion jig 20 having the insertion portion 21 having an outer diameter larger than that of the in-core 4 can be inserted into the inner cylindrical portion 12 of the second flow path member 3.
・第二流路部材3の内筒部12の内部への拡径治具20の挿入を同第二流路部材3の軸線方向における適当な位置で停止させることができるのであれば、拡径治具20の基部22を省略してもよい。 If the insertion of the diameter expansion jig 20 into the inner cylindrical portion 12 of the second flow path member 3 can be stopped at an appropriate position in the axial direction of the second flow path member 3, the diameter expansion The base 22 of the jig 20 may be omitted.
・第三工程において、内筒部12の内部から拡径治具を取り出す方法は、拡径治具を内筒部12に挿入した方向と反対の方向に移動させて引き抜く方法を採用することに限らず、拡径治具を挿入した方向と同一の方向に移動させて内筒部12の内部を通過させる方法を採用してもよい。 In the third step, the method of taking out the diameter expansion jig from the inside of the inner cylinder part 12 is to adopt a method of moving the diameter expansion jig in the direction opposite to the direction in which it is inserted into the inner cylinder part 12 and pulling it out. Not limited to this, a method of moving in the same direction as the direction in which the diameter expanding jig is inserted and passing the inside of the inner cylindrical portion 12 may be adopted.
・内筒部12の内側への挿入が完了したときのインコア4は、必ずしも第二孔18bの内側における第二流路部材3の軸線方向全体に亘って延びている必要はなく、第二孔18bの内側における上記軸線方向の一部のみで延びるようにしてもよい。例えば、第二孔18bの内側における外向き爪部16の径方向内方に当たる部分よりも下端側(図1の下方側)のみで延びるようにしたり、同部分よりも上端側(図1の上方側)のみで延びるようにしたりしてもよい。 The in-core 4 when the insertion into the inner cylinder portion 12 is completed does not necessarily have to extend over the entire axial direction of the second flow path member 3 inside the second hole 18b. You may make it extend only in a part of the said axial direction inside 18b. For example, it may extend only at the lower end side (lower side in FIG. 1) from the portion corresponding to the radially inner side of the outward claw portion 16 inside the second hole 18b, or at the upper end side (upward in FIG. 1) from the same portion. It is also possible to extend only on the side).
・第二流路部材3の内筒部12の内径とインコア4の外径とを同一にしてもよい。こうした構成によっても、内筒部12の内側にインコア4を装着することができる。
・シールリング9は、第一流路部材2と第二流路部材3との間隙がシールされるようになるのであれば、外筒部の内周面と内筒部の外周面との間に配設することに限らず、内筒部12の先端(図1における下端)と第一流路部材2の内面との間に配設するなど、任意の位置に配設することができる。
-You may make the internal diameter of the inner cylinder part 12 of the 2nd flow path member 3 and the outer diameter of the in-core 4 the same. Even with such a configuration, the in-core 4 can be mounted inside the inner cylinder portion 12.
If the gap between the first flow path member 2 and the second flow path member 3 is sealed, the seal ring 9 is between the inner peripheral surface of the outer cylinder portion and the outer peripheral surface of the inner cylinder portion. It is not limited to being disposed, but can be disposed at any position such as disposed between the tip of the inner cylinder portion 12 (lower end in FIG. 1) and the inner surface of the first flow path member 2.
・第一流路部材の外筒部の内周面および第二流路部材の内筒部の外周面の一方に周方向に環状に延びる係合凹部が形成されるとともに、他方に周方向に環状に延びる係合凸部が形成されて、それら係合凸部および係合凹部がスナップ係合する構造の管継手にも、上記実施形態の管継手は適用することができる。 An engagement recess extending annularly in the circumferential direction is formed on one of the inner peripheral surface of the outer cylinder portion of the first flow path member and the outer peripheral surface of the inner cylinder portion of the second flow path member, and the other is annular in the circumferential direction The pipe joint of the above-described embodiment can also be applied to a pipe joint having a structure in which an engaging convex portion extending in the direction is formed and the engaging convex portion and the engaging concave portion are snap-engaged.
・上記実施形態の管継手は、呼び径が「16A」の管材の接続に用いられる管継手にも適用することができる。その他、呼び径が「13A」や「16A」以外の管材の接続に用いられる管継手にも、上記実施形態の管継手は適用可能である。 -The pipe joint of the said embodiment is applicable also to the pipe joint used for the connection of the pipe material whose nominal diameter is "16A". In addition, the pipe joint of the said embodiment is applicable also to the pipe joint used for connection of pipe materials other than nominal diameter "13A" or "16A".
1…管継手、2…第一流路部材、3…第二流路部材、4…インコア、5…雄ねじ、6…外筒部、7…内向き爪部、7a…テーパ面、7b…円筒面、7c…垂直面、8…嵌合溝、8a…テーパ面、8b…円周面、9…シールリング、10…収容溝、11…大径部、12…内筒部、13…電熱線コイル、14…電極、16…外向き爪部、16a…テーパ面、16b…円筒面、16c…垂直面、17…フランジ、18a…第一孔、18b…第二孔、18c…第三孔、20…拡径治具、21…挿入部、22…基部、23…ストッパ面。 DESCRIPTION OF SYMBOLS 1 ... Pipe joint, 2 ... 1st flow path member, 3 ... 2nd flow path member, 4 ... Incore, 5 ... Male screw, 6 ... Outer cylinder part, 7 ... Inward claw part, 7a ... Tapered surface, 7b ... Cylindrical surface , 7c ... vertical surface, 8 ... fitting groove, 8a ... tapered surface, 8b ... circumferential surface, 9 ... seal ring, 10 ... receiving groove, 11 ... large diameter portion, 12 ... inner cylinder portion, 13 ... heating wire coil , 14 ... Electrode, 16 ... Outward claw, 16a ... Tapered surface, 16b ... Cylindrical surface, 16c ... Vertical surface, 17 ... Flange, 18a ... First hole, 18b ... Second hole, 18c ... Third hole, 20 ... Diameter expansion jig, 21 ... Insertion part, 22 ... Base part, 23 ... Stopper surface.
Claims (3)
前記第一流路部材と前記第二流路部材とが相対回転可能になっている
ことを特徴とする管継手。 A first flow path member having an outer cylinder portion having an engaged portion formed on an inner peripheral surface, a second flow path member having an inner cylinder portion having an engagement portion formed on an outer peripheral surface; An inner core that is inserted and disposed inside the inner cylinder part, and the outer cylinder is configured such that the engaged part of the outer cylinder part and the engagement part of the inner cylinder part are snap-engaged. In the pipe joint in which the inner cylinder part is inserted and arranged in the part,
The pipe joint, wherein the first flow path member and the second flow path member are rotatable relative to each other.
前記第一流路部材および前記第二流路部材のうちの一方を基準として他方に作用する捩りモーメントが「0.55N・m」以上であるときには、前記第一流路部材と前記第二流路部材とが相対回転する
ことを特徴とする管継手。 In the pipe joint according to claim 1,
When the torsional moment acting on the other of the first flow path member and the second flow path member as a reference is “0.55 N · m” or more, the first flow path member and the second flow path member And a pipe joint characterized by relative rotation.
前記外筒部の内周面と前記内筒部の外周面との間に配置されたシールリングを有する
ことを特徴とする管継手。 In the pipe joint according to claim 1 or 2,
A pipe joint comprising a seal ring disposed between an inner peripheral surface of the outer tube portion and an outer peripheral surface of the inner tube portion.
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JP2021124123A (en) * | 2020-01-31 | 2021-08-30 | 株式会社イノアック住環境 | Manufacturing method of hose joint |
JP7133737B1 (en) | 2022-04-11 | 2022-09-08 | 前澤給装工業株式会社 | Electric fusion joint integrated rotary joint, unit piping and unit piping construction method |
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JP2017101757A (en) * | 2015-12-02 | 2017-06-08 | 株式会社オンダ製作所 | Assembling method of joint |
JP2017110718A (en) * | 2015-12-16 | 2017-06-22 | 株式会社オンダ製作所 | Piping coupler |
JP2017125549A (en) * | 2016-01-13 | 2017-07-20 | 株式会社オンダ製作所 | Joint for piping |
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JP2017101757A (en) * | 2015-12-02 | 2017-06-08 | 株式会社オンダ製作所 | Assembling method of joint |
JP2017110718A (en) * | 2015-12-16 | 2017-06-22 | 株式会社オンダ製作所 | Piping coupler |
JP2017125549A (en) * | 2016-01-13 | 2017-07-20 | 株式会社オンダ製作所 | Joint for piping |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2021124123A (en) * | 2020-01-31 | 2021-08-30 | 株式会社イノアック住環境 | Manufacturing method of hose joint |
JP7373421B2 (en) | 2020-01-31 | 2023-11-02 | 株式会社イノアック住環境 | Hose joint manufacturing method |
JP7133737B1 (en) | 2022-04-11 | 2022-09-08 | 前澤給装工業株式会社 | Electric fusion joint integrated rotary joint, unit piping and unit piping construction method |
JP2023155646A (en) * | 2022-04-11 | 2023-10-23 | 前澤給装工業株式会社 | Electric fusion joint integrated rotary joint, unit pipe, and unit pipe method |
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