JP2021038853A - Resin-made pipe joint - Google Patents

Resin-made pipe joint Download PDF

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JP2021038853A
JP2021038853A JP2020200023A JP2020200023A JP2021038853A JP 2021038853 A JP2021038853 A JP 2021038853A JP 2020200023 A JP2020200023 A JP 2020200023A JP 2020200023 A JP2020200023 A JP 2020200023A JP 2021038853 A JP2021038853 A JP 2021038853A
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inner peripheral
peripheral surface
press
axial direction
tubular
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睦 藤井
Mutsumi Fujii
睦 藤井
俊英 飯田
Shunei Iida
俊英 飯田
智幸 小池
Tomoyuki Koike
智幸 小池
元彰 成尾
Motoaki Naruo
元彰 成尾
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Nippon Pillar Packing Co Ltd
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Abstract

To provide a resin-made pipe joint capable of preventing a fluid flowing between a joint body and an inner ring from decreasing in replaceability.SOLUTION: A press-in part projects from an inner ring in an axial-center direction and is pressed in one lengthwise end part of a tube. An inside projection part projects from the inner ring to the other side in the axial-center direction and comes into contact with an inner-side cylinder part of a joint body to constitute a fluid passage. The inside projection part includes a first inner peripheral surface, and the press-in part includes a second inner peripheral surface and a third inner peripheral surface. In the state in which the inside projection part is separated from the inside cylinder part of the joint body and the press-in part is separated from the one lengthwise end part of the tube, the third inner peripheral surface has a larger maximum inner diameter than the first inner peripheral surface, and the second inner peripheral surface has a larger maximum inner diameter than the third inner peripheral surface.SELECTED DRAWING: Figure 2

Description

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

従来、半導体製造、医療・医薬品製造、食品加工および化学工業等の技術分野の製造装置において使用され得る樹脂製管継手が知られている(例えば、特許文献1参照)。この種の樹脂製管継手は、超純水または薬液等の流体を流通させるためのチューブを別のチューブまたは流体機器と連結するために、前記チューブの長手方向一端部に接合可能に構成されている。詳しくは、前記樹脂製管継手は、継手本体と、インナーリングと、ユニオンナットとを備えている。 Conventionally, resin pipe fittings that can be used in manufacturing equipment in technical fields such as semiconductor manufacturing, medical / pharmaceutical manufacturing, food processing, and chemical industry are known (see, for example, Patent Document 1). This type of resin fitting is configured to be joinable to one end of the tube in the longitudinal direction in order to connect a tube for circulating fluids such as ultrapure water or chemicals to another tube or fluid device. There is. Specifically, the resin pipe joint includes a joint body, an inner ring, and a union nut.

前記継手本体は、本体筒部と、外側筒部と、内側筒部と、溝部と、第1螺合部とを有している。前記外側筒部は、前記本体筒部からその軸心方向一方へ同軸的に突設されている。前記内側筒部は、前記外側筒部の径方向内方に配置されかつ前記本体筒部から前記外側筒部と同方向へ同軸的に突設されている。前記溝部は、筒形状を有し、前記本体筒部の軸心方向一方へ開口するように前記外側筒部と前記内側筒部の間に設けられている。第1螺合部は、外側筒部の外周部に設けられている。 The joint main body has a main body tubular portion, an outer tubular portion, an inner tubular portion, a groove portion, and a first screwed portion. The outer tubular portion is coaxially projected from the main body tubular portion in one direction in the axial direction thereof. The inner cylinder portion is arranged inward in the radial direction of the outer cylinder portion and projects coaxially from the main body cylinder portion in the same direction as the outer cylinder portion. The groove portion has a tubular shape and is provided between the outer tubular portion and the inner tubular portion so as to open in one direction in the axial direction of the main body tubular portion. The first screwed portion is provided on the outer peripheral portion of the outer tubular portion.

インナーリングは、嵌合部と、圧入部と、外側突出部と、内側突出部とを有している。前記嵌合部は、筒形状を有し前記継手本体の外側筒部の内側に嵌合され得るように構成されている。前記圧入部は、筒形状を有し、前記チューブの長手方向一端部に圧入され得るように前記嵌合部から軸心方向一方へ突設されている。前記外側突出部は、筒形状を有し、前記継手本体の溝部に圧入され得るように前記嵌合部から軸心方向他方へ突設されている。前記内側突出部は、筒形状を有し、軸心方向に関して前記継手本体の内側筒部に接触し得るように前記嵌合部から軸心方向他方へ突設されている。前記内側突出部は、また、前記内側筒部と接触する際に前記外側突出部と前記内側突出部とによって前記内側筒部を径方向に挟むように前記外側突出部の径方向内方に配置されている。 The inner ring has a fitting portion, a press-fit portion, an outer protruding portion, and an inner protruding portion. The fitting portion has a tubular shape and is configured so that it can be fitted inside the outer tubular portion of the joint body. The press-fitting portion has a tubular shape, and is projected from the fitting portion to one side in the axial direction so that the press-fitting portion can be press-fitted into one end in the longitudinal direction of the tube. The outer protruding portion has a tubular shape, and is projected from the fitting portion to the other in the axial direction so as to be press-fitted into the groove portion of the joint body. The inner protruding portion has a tubular shape, and is projected from the fitting portion to the other in the axial direction so as to come into contact with the inner tubular portion of the joint body in the axial direction. The inner protrusion is also arranged radially inward of the outer protrusion so as to radially sandwich the inner cylinder between the outer protrusion and the inner protrusion when in contact with the inner cylinder. Has been done.

ユニオンナットは、ナット本体と、第2螺合部と、押圧部とを有している。前記ナット本体は、筒形状を有している。前記第2螺合部は、前記第1螺合部に螺合し得るように前記ナット本体の内周部に設けられている。前記押圧部は、前記第1螺合部に対する前記第2螺合部の螺進に伴い前記チューブを介して前記インナーリングの圧入部を前記本体筒部の軸心方向他方へ押圧するように構成されている。 The union nut has a nut body, a second screwed portion, and a pressing portion. The nut body has a tubular shape. The second screwed portion is provided on the inner peripheral portion of the nut body so that the second screwed portion can be screwed into the first screwed portion. The pressing portion is configured to press the press-fitting portion of the inner ring via the tube toward the other side in the axial direction of the main body cylinder portion as the second screwing portion is screwed with respect to the first screwing portion. Has been done.

そして、前記樹脂製管継手は、前記ユニオンナットが前記継手本体に対して締められることによって、シール力が径方向に作用するシール部が前記継手本体の溝部とインナーリングの外側突出部との間に形成されるように、かつ、シール力が軸心方向に作用する別のシール部が前記継手本体の内側筒部と前記インナーリングの内側突出部との間に形成されるように、前記継手本体が前記インナーリングを介して前記チューブの長手方向一端部と連結されるように構成されている。これにより、前記樹脂製管継手が、前記チューブの長手方向一端部と接合されるようになっている。 Then, in the resin pipe joint, the union nut is tightened with respect to the joint body, so that the sealing portion on which the sealing force acts in the radial direction is between the groove portion of the joint body and the outer protruding portion of the inner ring. The joint is formed so that another seal portion on which the sealing force acts in the axial direction is formed between the inner cylinder portion of the joint body and the inner protruding portion of the inner ring. The main body is configured to be connected to one end of the tube in the longitudinal direction via the inner ring. As a result, the resin pipe joint is joined to one end of the tube in the longitudinal direction.

特開2013−100876号公報Japanese Unexamined Patent Publication No. 2013-100876

従来の樹脂製管継手においては、ユニオンナットを用いて前記継手本体と前記チューブの長手方向一端部とが連結される際、インナーリングの外側突出部が、シール部を形成するために前記継手本体の溝部に圧入される。そのため、前記内側筒部が、前記外側突出部により径方向内方に押される。そして、前記インナーリングの内側突出部が、別のシール部を形成するように前記内側筒部と接触した状態で、前記内側筒部により径方向内方に押される。 In a conventional resin pipe joint, when the joint body and one end portion in the longitudinal direction of the tube are connected by using a union nut, the outer protrusion of the inner ring forms a seal portion, so that the joint body is formed. It is press-fitted into the groove of the. Therefore, the inner cylinder portion is pushed inward in the radial direction by the outer protrusion portion. Then, the inner protruding portion of the inner ring is pushed inward in the radial direction by the inner cylinder portion in a state of being in contact with the inner cylinder portion so as to form another seal portion.

これにより、前記インナーリングにおいて、前記内側突出部の一部が、当該内側突出部の径方向内方に設けられた流体流路内へ突出することとなっていた。したがって、流体が前記継手本体と前記インナーリングとの間を流れる際、この流体の流れが、前記インナーリングの流体流路付近において、当該流体流路内へ突出した前記内側突出部の一部により妨げられて、流体が前記継手本体と前記インナーリングとの繋ぎ目箇所に滞留し、流体の置換性が低下することがあった。この流体の置換性の低下は、例えば、流体に含まれる成分が析出してパーティクルが発生するという問題や、前記チューブのフラッシングにかかる時間が増大するという問題を招く。 As a result, in the inner ring, a part of the inner protruding portion protrudes into the fluid flow path provided inward in the radial direction of the inner protruding portion. Therefore, when the fluid flows between the joint body and the inner ring, the flow of the fluid is caused by a part of the inner protruding portion protruding into the fluid flow path in the vicinity of the fluid flow path of the inner ring. This hindered the fluid from staying at the joint between the joint body and the inner ring, which may reduce the replaceability of the fluid. This decrease in the replaceability of the fluid causes, for example, a problem that components contained in the fluid are precipitated to generate particles, and a problem that the time required for flushing the tube is increased.

本発明は、このような事情に鑑みてなされたものであり、継手本体とインナーリングとの間を流れる流体の置換性の低下を防止できる樹脂製管継手の提供を目的とする。 The present invention has been made in view of such circumstances, and an object of the present invention is to provide a resin pipe joint capable of preventing a decrease in replaceability of a fluid flowing between a joint body and an inner ring.

本発明は、
チューブの長手方向一端部と接合可能な樹脂製管継手において、
本体筒部、前記本体筒部にその軸心方向一方へ同軸的に突設された外側筒部、前記外側筒部の径方向内方に配置されかつ前記本体筒部に前記外側筒部と同方向へ同軸的に突設された内側筒部、前記本体筒部の軸心方向一方へ開口するように前記本体筒部と前記外側筒部と前記内側筒部との間に設けられた溝部、および、前記外側筒部の外周部に設けられた第1螺合部を有する継手本体と、
前記継手本体の外側筒部の内側に嵌合され得る筒形状の嵌合部、前記チューブの長手方向一端部に圧入され得るように前記嵌合部に軸心方向一方へ突設された筒形状の圧入部、前記継手本体の溝部に圧入され得るように前記嵌合部に軸心方向他方へ突設された筒形状の外側突出部、および、前記継手本体の内側筒部と軸心方向に接触し得るように前記嵌合部に軸心方向他方へ突設された筒形状の内側突出部であって、前記内側筒部と接触する際に前記外側突出部との間に前記内側筒部を径方向に挟むように前記外側突出部の径方向内方に配置された内側突出部を有するインナーリングと、
筒形状のナット本体、前記継手本体の第1螺合部に螺合し得るように前記ナット本体の内周部に設けられた第2螺合部、前記第1螺合部に対する前記第2螺合部の螺進に伴って前記インナーリングの圧入部を圧入したチューブを当該圧入部に向かって押圧し得るように構成された押圧部を有するユニオンナットとを備え、
前記継手本体の内側筒部の内周部および前記インナーリングの内側突出部の内周部は、当該内側筒部と当該内側突出部との接触によって互いに連通する流体流路の流路壁を構成し、
前記インナーリングの内側突出部の突出端部が、前記継手本体の内側筒部の最小内径以上の内径を有し、
前記インナーリングの軸心方向他方から軸心方向一方へ向かうに従って当該内側突出部の内径を縮小させる第1内周面が、前記インナーリングの内側突出部の内周部に備えられるものである。
The present invention
In a resin pipe fitting that can be joined to one end in the longitudinal direction of the tube
The main body cylinder portion, the outer cylinder portion coaxially projecting from the main body cylinder portion in one axial direction, and the outer cylinder portion arranged in the radial direction of the outer cylinder portion and the same as the outer cylinder portion in the main body cylinder portion. An inner cylinder portion coaxially projecting in the direction, a groove portion provided between the main body cylinder portion, the outer cylinder portion, and the inner cylinder portion so as to open in one of the axial directions of the main body cylinder portion. And a joint body having a first screwed portion provided on the outer peripheral portion of the outer tubular portion, and
A tubular fitting portion that can be fitted inside the outer tubular portion of the joint body, and a tubular shape that protrudes from the fitting portion in one axial direction so that it can be press-fitted into one end in the longitudinal direction of the tube. In the direction of the inner cylinder of the joint body and the inner cylinder of the joint body, the press-fitting portion of the joint body, the tubular outer protruding portion projecting from the fitting portion to the other in the axial direction so that the joint body can be press-fitted A tubular inward projecting portion projecting from the fitting portion to the other side in the axial direction so as to be able to come into contact with the inner tubular portion, and the inner tubular portion between the fitting portion and the outer protruding portion when contacting the inner tubular portion. An inner ring having an inner protruding portion arranged inward in the radial direction of the outer protruding portion so as to sandwich the outer ring in the radial direction.
The tubular nut body, the second screwed portion provided on the inner peripheral portion of the nut body so that it can be screwed into the first screwed portion of the joint body, and the second screw with respect to the first screwed portion. A union nut having a pressing portion configured to be able to press the press-fitted portion of the inner ring with the screwing of the joint portion toward the press-fitted portion is provided.
The inner peripheral portion of the inner tubular portion of the joint body and the inner peripheral portion of the inner protruding portion of the inner ring form a flow path wall of a fluid flow path that communicates with each other by contact between the inner tubular portion and the inner protruding portion. And
The protruding end of the inner protruding portion of the inner ring has an inner diameter equal to or larger than the minimum inner diameter of the inner tubular portion of the joint body.
A first inner peripheral surface that reduces the inner diameter of the inner protruding portion from the other in the axial direction of the inner ring toward one in the axial direction is provided on the inner peripheral portion of the inner protruding portion of the inner ring.

この構成によれば、前記インナーリングの外側突出部が、前記継手本体の溝部に圧入されたとき、前記継手本体の内側筒部が前記外側突出部により径方向内方へ押される。そのため、前記外側突出部と協働して内側筒部を径方向に挟む前記内側突出部が、前記内側筒部により径方向内方へ押される。これにより、前記内側突出部が、前記内周面が径方向内方へ移動するように変形する。この際、前記内周面が前述の形状を有することから、前記内側突出部が前記インナーリングの流体流路内へ突出するように変形することは抑止できる。したがって、前記樹脂製管継手が前記チューブの長手方向一端部と接合された後の状態で、流体が前記継手本体と前記インナーリングとの間を流れる際、前記継手本体と前記インナーリングとの連通領域において、流体の流れを妨げるものを存在させずに済み、流体の円滑な流れを確保することができる。よって、前記継手本体と前記インナーリングとの間を流れる流体の置換性の低下を防止できる。 According to this configuration, when the outer protrusion of the inner ring is press-fitted into the groove of the joint body, the inner cylinder portion of the joint body is pushed inward in the radial direction by the outer protrusion. Therefore, the inner protrusion that sandwiches the inner cylinder in the radial direction in cooperation with the outer protrusion is pushed inward in the radial direction by the inner cylinder. As a result, the inner protruding portion is deformed so that the inner peripheral surface moves inward in the radial direction. At this time, since the inner peripheral surface has the above-mentioned shape, it is possible to prevent the inner protruding portion from being deformed so as to protrude into the fluid flow path of the inner ring. Therefore, when the fluid flows between the joint body and the inner ring in a state after the resin pipe joint is joined to one end in the longitudinal direction of the tube, the joint body and the inner ring communicate with each other. In the region, it is not necessary to have anything obstructing the flow of the fluid, and a smooth flow of the fluid can be ensured. Therefore, it is possible to prevent a decrease in the replaceability of the fluid flowing between the joint body and the inner ring.

本発明の別の形態によれば、
前記第1内周面が、テーパ面である。
According to another embodiment of the invention
The first inner peripheral surface is a tapered surface.

本発明の更なる形態によれば、
前記第1内周面が、前記インナーリングの径方向内方側へ向かって凸となる凸曲面である。
According to a further aspect of the invention
The first inner peripheral surface is a convex curved surface that is convex inward in the radial direction of the inner ring.

この構成によれば、前記インナーリングの外側突出部が前記継手本体の溝部に圧入されたとき、前記内側突出部の内周面を、より滑らかな面に、即ち前記内側突出部に設けられた流体流路の流路断面積をより正確に一定に保たせ得る面に変化させることができる。したがって、前記インナーリングの流体流路において、流体の円滑な流れの促進を図ることができる。 According to this configuration, when the outer protrusion of the inner ring is press-fitted into the groove of the joint body, the inner peripheral surface of the inner protrusion is provided on a smoother surface, that is, on the inner protrusion. The flow path cross-sectional area of the fluid flow path can be changed to a surface that can be kept more accurate and constant. Therefore, it is possible to promote the smooth flow of the fluid in the fluid flow path of the inner ring.

本発明のまた別の形態によれば、
前記インナーリングの圧入部が、
前記第1螺合部に対する前記第2螺合部の螺進時に前記チューブを介して前記押圧部を受け止めるための傾斜部であって、前記インナーリングの軸心方向他方から軸心方向一方へ向かうに従って外径が縮小するように、当該圧入部の突出端部の外周部に設けられた傾斜部と、
前記インナーリングの軸心方向一方から軸心方向他方へ向かうに従って前記圧入部の突出端部の内径を縮小させるように、当該圧入部の突出端部の内周部に設けられた第2内周面と、
前記インナーリングの軸心方向一方から軸心方向他方へ向かうに従って前記圧入部の突出端部の内径を縮小させるように、当該圧入部の突出端部の内周部に設けられた第3内周面であって、前記第2内周面の勾配よりも小さい勾配を有し、前記第2内周面の軸心方向他方でかつ前記傾斜部の径方向内方に配置された第3内周面とを含む。
According to yet another embodiment of the invention.
The press-fitting part of the inner ring
An inclined portion for receiving the pressing portion via the tube when the second screwing portion is screwed with respect to the first screwing portion, and the inner ring is directed from the other in the axial direction to the one in the axial direction. An inclined portion provided on the outer peripheral portion of the protruding end portion of the press-fitting portion and an inclined portion so that the outer diameter is reduced accordingly.
A second inner circumference provided on the inner peripheral portion of the protruding end portion of the press-fitting portion so that the inner diameter of the protruding end portion of the press-fitting portion is reduced from one axial direction of the inner ring to the other in the axial direction. Face and
A third inner circumference provided on the inner peripheral portion of the protruding end of the press-fitting portion so that the inner diameter of the protruding end of the press-fitting portion is reduced from one axial direction of the inner ring to the other in the axial direction. A third inner peripheral surface which has a gradient smaller than the gradient of the second inner peripheral surface and is arranged on the other side in the axial direction of the second inner peripheral surface and inward in the radial direction of the inclined portion. Including faces.

この構成によれば、前記ユニオンナットの第2螺合部が、前記継手本体の第1螺合部に螺合したとき、前記インナーリングの圧入部の傾斜部が前記チューブを介して前記ユニオンナットの押圧部により押される。この際、前記傾斜部は、押圧部の押圧力を当該傾斜部に平行な方向と垂直な方向とに分散する。これにより、前記圧入部の突出端部が、前記第2内周面および前記第3内周面が前記インナーリングの径方向内方へ移動するように変形する。この際、前記第2内周面および前記第3内周面が前述のような形状を有することから、前記圧入部の突出端部が前記インナーリングの流体流路内へ突出するように変形することは抑止できる。したがって、前記樹脂製管継手が前記チューブの長手方向一端部と接合された後の状態で、流体が前記チューブと前記インナーリングとの間を流れる際、前記チューブと前記インナーリングとの連通領域において、流体の流れを妨げるものを存在させずに済み、流体の円滑な流れを確保することができる。よって、前記チューブと前記インナーリングとの間を流れる流体の置換性の低下も防止できる。 According to this configuration, when the second screwed portion of the union nut is screwed into the first screwed portion of the joint body, the inclined portion of the press-fitting portion of the inner ring passes through the tube to the union nut. It is pushed by the pressing part of. At this time, the inclined portion distributes the pressing force of the pressing portion in the direction parallel to the inclined portion and the direction perpendicular to the inclined portion. As a result, the protruding end portion of the press-fitting portion is deformed so that the second inner peripheral surface and the third inner peripheral surface move inward in the radial direction of the inner ring. At this time, since the second inner peripheral surface and the third inner peripheral surface have the above-mentioned shapes, the protruding end portion of the press-fitting portion is deformed so as to protrude into the fluid flow path of the inner ring. That can be deterred. Therefore, when the fluid flows between the tube and the inner ring in a state after the resin pipe joint is joined to one end in the longitudinal direction of the tube, in the communication region between the tube and the inner ring. , It is not necessary to have anything obstructing the flow of the fluid, and the smooth flow of the fluid can be ensured. Therefore, it is possible to prevent a decrease in the replaceability of the fluid flowing between the tube and the inner ring.

本発明によれば、継手本体とインナーリングとの間を流れる流体の置換性の低下を防止できる樹脂製管継手を提供できる。 According to the present invention, it is possible to provide a resin pipe joint capable of preventing a decrease in the replaceability of the fluid flowing between the joint body and the inner ring.

本発明の一実施形態に係る樹脂製管継手がチューブの長手方向一端部と接合した後の状態を示す断面図である。It is sectional drawing which shows the state after the resin pipe joint which concerns on one Embodiment of this invention is joined with one end part in the longitudinal direction of a tube. 図1の樹脂製管継手のインナーリングの断面図である。It is sectional drawing of the inner ring of the resin pipe joint of FIG. 図2のインナーリングの内側突出部付近の断面図である。It is sectional drawing of the vicinity of the inner protrusion part of the inner ring of FIG. (a)図1の樹脂製管継手とチューブの長手方向一端部との接合前における樹脂製管継手の継手本体とインナーリングとの関係を示す断面図である。(b)図1の樹脂製管継手とチューブの長手方向一端部との接合後における樹脂製管継手の継手本体とインナーリングとの関係を示す断面図である。(A) is a cross-sectional view showing the relationship between the joint body and the inner ring of the resin pipe joint before joining the resin pipe joint of FIG. 1 and one end of the tube in the longitudinal direction. (B) is a cross-sectional view showing the relationship between the joint body and the inner ring of the resin pipe joint after joining the resin pipe joint of FIG. 1 and one end of the tube in the longitudinal direction. 別実施例の内側突出部を含むインナーリングの部分拡大図である。It is a partially enlarged view of the inner ring including the inner protrusion part of another embodiment. 図2のインナーリングの圧入部付近の断面図である。It is sectional drawing of the vicinity of the press-fitting part of the inner ring of FIG. (a)図1の樹脂製管継手とチューブの長手方向一端部との接合前における樹脂製管継手のインナーリングとチューブの関係を示す断面図である。(b)図1の樹脂製管継手とチューブの長手方向一端部との接合後における樹脂製管継手のインナーリングとチューブの関係を示す断面図である。(A) is a cross-sectional view showing a relationship between an inner ring of a resin pipe joint and a tube before joining the resin pipe joint of FIG. 1 and one end in the longitudinal direction of the tube. (B) is a cross-sectional view showing the relationship between the inner ring and the tube of the resin pipe joint after joining the resin pipe joint of FIG. 1 and one end in the longitudinal direction of the tube. 別実施例の圧入部の突出端部を含むインナーリングの部分拡大図である。It is a partial enlarged view of the inner ring including the protruding end portion of the press-fitting portion of another embodiment.

本発明の一実施形態について図面を参照しつつ説明する。 An embodiment of the present invention will be described with reference to the drawings.

図1は、本発明の一実施形態に係る樹脂製管継手1がチューブ2の長手方向一端部3と接合した後の状態を示す断面図である。 FIG. 1 is a cross-sectional view showing a state after the resin pipe joint 1 according to the embodiment of the present invention is joined to one end portion 3 in the longitudinal direction of the tube 2.

樹脂製管継手1は、流体(例えば、超純水または薬液等の液体)を流通させるためのチューブ2を別のチューブまたは所定の流体機器(例えば、弁やポンプ)に連結させるために、チューブ2の長手方向一端部3に接合可能に構成されている。本実施形態において、樹脂製管継手1は、図1に示すように、チューブ2の長手方向一端部3と接合される。 The resin pipe joint 1 is a tube for connecting a tube 2 for flowing a fluid (for example, a liquid such as ultrapure water or a chemical solution) to another tube or a predetermined fluid device (for example, a valve or a pump). It is configured so that it can be joined to one end 3 in the longitudinal direction of 2. In the present embodiment, the resin pipe joint 1 is joined to one end portion 3 in the longitudinal direction of the tube 2 as shown in FIG.

樹脂製管継手1は、継手本体5と、インナーリング6と、ユニオンナット7とを備えている。本実施形態において、チューブ2は、可撓性を有する円筒形状の部材であり、所定の樹脂、例えば、PFA(テトラフルオロエチレン・パーフルオロアルキルビニルエーテル共重合体)またはPTFE(ポリテトラフルオロエチレン)等のフッ素樹脂を用いて製造されている。 The resin pipe joint 1 includes a joint body 5, an inner ring 6, and a union nut 7. In the present embodiment, the tube 2 is a flexible cylindrical member, and a predetermined resin such as PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer) or PTFE (polytetrafluoroethylene) or the like is used. Manufactured using the fluororesin of.

継手本体5は、本体筒部11と、外側筒部12と、内側筒部13と、溝部14と、第1螺合部15とを備えている。継手本体5は、また、流体を流通させるための流体流路18を備えている。本実施形態において、継手本体5は、筒孔を有する筒形状に形成されている。そして、流体流路18は、前記筒孔から構成され、継手本体5の軸心方向に沿って延びるように継手本体5に設けられている。 The joint main body 5 includes a main body tubular portion 11, an outer tubular portion 12, an inner tubular portion 13, a groove portion 14, and a first screwed portion 15. The joint body 5 also includes a fluid flow path 18 for circulating the fluid. In the present embodiment, the joint body 5 is formed in a tubular shape having a tubular hole. The fluid flow path 18 is formed of the tubular hole and is provided in the joint body 5 so as to extend along the axial direction of the joint body 5.

継手本体5は、所定の樹脂、例えば、PFA、PTFE、PVDF(ポリビニリデンフルオライド)、ETFE(テトラフルオロエチレン・エチレン共重合体)、FEP(テトラフルオロエチレン・ヘキサフルオロプロピレン共重合体)等のフッ素樹脂を用いて製造されている。なお、継手本体5(本体筒部11)の軸心は、樹脂製管継手1の軸心20と一致する。 The joint body 5 is made of a predetermined resin such as PFA, PTFE, PVDF (polyvinylidene fluoride), ETFE (tetrafluoroethylene / ethylene copolymer), FEP (tetrafluoroethylene / hexafluoropropylene copolymer), or the like. Manufactured using fluororesin. The axis of the joint body 5 (main body cylinder 11) coincides with the axis 20 of the resin pipe joint 1.

本体筒部11は、第1流体流路21を有している。第1流体流路21は、継手本体5の流体流路18に含まれる。第1流体流路21は、継手本体5(本体筒部11)の軸心方向に沿って延びるように、本体筒部11に設けられている。詳しくは、本体筒部11は、円筒形状に形成されており、第1流体流路21は、本体筒部11に形成されている略一定の孔径を有する筒孔からなる。 The main body cylinder portion 11 has a first fluid flow path 21. The first fluid flow path 21 is included in the fluid flow path 18 of the joint body 5. The first fluid flow path 21 is provided in the main body cylinder portion 11 so as to extend along the axial direction of the joint main body 5 (main body cylinder portion 11). Specifically, the main body tubular portion 11 is formed in a cylindrical shape, and the first fluid flow path 21 is formed of a tubular hole having a substantially constant hole diameter formed in the main body tubular portion 11.

外側筒部12は、筒形状に形成されており、本体筒部11にその軸心方向一方へ同軸的に突設されている。外側筒部12は、本体筒部11の軸心方向一方へ開口する受口を有している。外側筒部12は、また、インナーリング6と当該インナーリング6を圧入したチューブ2の長手方向一端部3とを前記受口から受け入れることができる筒孔を有している。本実施形態において、外側筒部12は、円筒形状に形成されている。 The outer tubular portion 12 is formed in a tubular shape, and is coaxially projected from the main body tubular portion 11 in one direction in the axial direction thereof. The outer cylinder portion 12 has a receiving port that opens in one direction in the axial direction of the main body cylinder portion 11. The outer tubular portion 12 also has a tubular hole capable of receiving the inner ring 6 and the longitudinal end portion 3 of the tube 2 into which the inner ring 6 is press-fitted from the receiving port. In the present embodiment, the outer tubular portion 12 is formed in a cylindrical shape.

内側筒部13は、筒形状に形成されており、外側筒部12の径方向内方に配置されるとともに、本体筒部11に外側筒部12と同方向へ同軸的に突設されている。内側筒部13は、その突出端部(軸心方向一方の端部)22が外側筒部12の突出端部(軸心方向一方の端部)23よりも継手本体5の軸心方向他方に位置するように、本体筒部11の軸心方向一方の端部に設けられている。 The inner tubular portion 13 is formed in a tubular shape, is arranged inward in the radial direction of the outer tubular portion 12, and is coaxially projected from the main body tubular portion 11 in the same direction as the outer tubular portion 12. .. The protruding end (one end in the axial direction) 22 of the inner tubular portion 13 is closer to the other in the axial direction of the joint body 5 than the protruding end (one end in the axial direction) 23 of the outer tubular portion 12. It is provided at one end of the main body cylinder portion 11 in the axial direction so as to be located.

本実施形態において、内側筒部13は、円筒形状に形成されている。内側筒部13は、本体筒部11の内径と略同一寸法の最小内径D0を有している(図2参照)。内側筒部13は、また、一定の外径を有している。そして、内側筒部13は、外側筒部12よりも継手本体5の径方向内方に所定間隔を隔て配置されている。内側筒部13は、外側筒部12と略平行に並べられている。 In the present embodiment, the inner tubular portion 13 is formed in a cylindrical shape. The inner cylinder portion 13 has a minimum inner diameter D0 having substantially the same dimensions as the inner diameter of the main body cylinder portion 11 (see FIG. 2). The inner cylinder portion 13 also has a constant outer diameter. The inner tubular portion 13 is arranged inward in the radial direction of the joint body 5 with a predetermined interval from the outer tubular portion 12. The inner cylinder portion 13 is arranged substantially parallel to the outer cylinder portion 12.

内側筒部13は、第2流体流路24を有している。第2流体流路24は、継手本体5の流体流路18に含まれる。第2流体流路24は、略一定の孔径を有する内側筒部13の筒孔から構成され、継手本体5(内側筒部13)の軸心方向に沿って延びるように、内側筒部13に設けられている。第2流体流路24は、第1流体流路21と略同一の流路断面積を有し、第1流体流路21と連続して形成されている。 The inner cylinder portion 13 has a second fluid flow path 24. The second fluid flow path 24 is included in the fluid flow path 18 of the joint body 5. The second fluid flow path 24 is composed of a tubular hole of the inner tubular portion 13 having a substantially constant hole diameter, and is formed in the inner tubular portion 13 so as to extend along the axial direction of the joint body 5 (inner tubular portion 13). It is provided. The second fluid flow path 24 has substantially the same flow path cross-sectional area as the first fluid flow path 21, and is formed continuously with the first fluid flow path 21.

内側筒部13は、第1シール面26を備えている。第1シール面26は、内側筒部13の突出端部22の内周部の全周にわたって形成されている環状のテーパ面である。第1シール面26は、内側筒部13の突出端部22の内径が本体筒部11の軸心方向一方から軸心方向他方(本体筒部11側)へ向かうに従って縮小するように、突出端部22の内周部に設けられている。 The inner cylinder portion 13 includes a first sealing surface 26. The first sealing surface 26 is an annular tapered surface formed over the entire inner circumference of the protruding end portion 22 of the inner tubular portion 13. The first sealing surface 26 has a protruding end so that the inner diameter of the protruding end 22 of the inner cylinder 13 decreases from one axial direction of the main body cylinder 11 toward the other (main body cylinder 11 side). It is provided on the inner peripheral portion of the portion 22.

溝部14は、本体筒部11の軸心方向一方へ開口するように、本体筒部11と外側筒部12と内側筒部13との間に設けられている。具体的には、本体筒部11と外側筒部12と内側筒部13とによって囲まれた環状溝の領域が溝部14となる。溝部14は、外側筒部12および内側筒部13の径方向に関して、略一定の径方向幅を有している。溝部14の径方向幅は、インナーリング6における後述の外側突出部33の径方向幅よりも小さく設定されている。 The groove portion 14 is provided between the main body cylinder portion 11, the outer cylinder portion 12, and the inner cylinder portion 13 so as to open in one direction in the axial direction of the main body cylinder portion 11. Specifically, the region of the annular groove surrounded by the main body cylinder portion 11, the outer cylinder portion 12, and the inner cylinder portion 13 is the groove portion 14. The groove portion 14 has a substantially constant radial width with respect to the radial direction of the outer tubular portion 12 and the inner tubular portion 13. The radial width of the groove portion 14 is set to be smaller than the radial width of the outer protruding portion 33 of the inner ring 6, which will be described later.

第1螺合部15は、外側筒部12の外周部に設けられている。第1螺合部15は、本実施形態においては雄ねじである。この雄ねじは、外側筒部12の軸心方向に沿って延びるように、外側筒部12の外周部に設けられている。 The first screwed portion 15 is provided on the outer peripheral portion of the outer tubular portion 12. The first screw portion 15 is a male screw in this embodiment. The male screw is provided on the outer peripheral portion of the outer tubular portion 12 so as to extend along the axial direction of the outer tubular portion 12.

インナーリング6は、嵌合部31と、圧入部32と、外側突出部33と、内側突出部34とを備えている。インナーリング6は、また、流体を流通させるためにインナーリング6のリング孔40から構成された流体流路37を備えている。流体流路37は、インナーリング6の軸心方向に沿って延びるようにインナーリング6に設けられている。 The inner ring 6 includes a fitting portion 31, a press-fitting portion 32, an outer protruding portion 33, and an inner protruding portion 34. The inner ring 6 also includes a fluid flow path 37 composed of ring holes 40 of the inner ring 6 for allowing fluid to flow. The fluid flow path 37 is provided in the inner ring 6 so as to extend along the axial direction of the inner ring 6.

インナーリング6は、流体流路37が継手本体5の流体流路18およびチューブ2の流体流路39と連通接続させ得るように構成されている。インナーリング6は、所定の樹脂、例えば、PFA、PVDF、ETFE、FEPまたはPTFE等のフッ素樹脂を用いて製造されている。ここで、インナーリング6の内径(リング孔40の孔径)は、インナーリング6の軸心方向両端部を除いて略一定である。 The inner ring 6 is configured so that the fluid flow path 37 can communicate with the fluid flow path 18 of the joint body 5 and the fluid flow path 39 of the tube 2. The inner ring 6 is manufactured using a predetermined resin, for example, a fluororesin such as PFA, PVDF, ETFE, FEP or PTFE. Here, the inner diameter of the inner ring 6 (the hole diameter of the ring hole 40) is substantially constant except for both ends in the axial direction of the inner ring 6.

嵌合部31は、筒形状に形成されており、継手本体5の外側筒部12の内側に嵌合され得るように構成されている。嵌合部31は、外側筒部12の内周形状に応じた形状、本実施形態においては円筒形状に形成されている。嵌合部31は、外側筒部12の内側に嵌合されたときに当該外側筒部12の内周部と接触するように、外側筒部12の内径と略同一寸法の外径を有している。 The fitting portion 31 is formed in a tubular shape and is configured so that it can be fitted inside the outer tubular portion 12 of the joint body 5. The fitting portion 31 is formed in a shape corresponding to the inner peripheral shape of the outer tubular portion 12, and in the present embodiment, in a cylindrical shape. The fitting portion 31 has an outer diameter substantially the same as the inner diameter of the outer cylinder portion 12 so as to come into contact with the inner peripheral portion of the outer cylinder portion 12 when fitted inside the outer cylinder portion 12. ing.

嵌合部31は、第3流体流路41を有している。第3流体流路41は、インナーリング6の流体流路37に含まれる。第3流体流路41は、嵌合部31の筒孔(リング孔40)から構成され、インナーリング6(嵌合部31)の軸心方向に沿って延びるように、嵌合部31に設けられている。第3流体流路41は、略一定の流路断面積を有している。 The fitting portion 31 has a third fluid flow path 41. The third fluid flow path 41 is included in the fluid flow path 37 of the inner ring 6. The third fluid flow path 41 is composed of a tubular hole (ring hole 40) of the fitting portion 31, and is provided in the fitting portion 31 so as to extend along the axial direction of the inner ring 6 (fitting portion 31). Has been done. The third fluid flow path 41 has a substantially constant flow path cross-sectional area.

圧入部32は、筒形状に形成されており、チューブ2の長手方向一端部3に圧入され得るように嵌合部31からインナーリング6の軸心方向一方へ突設されている。圧入部32は、外径および内径が変化する円筒形状に形成されている。圧入部32は、嵌合部31の内径およびチューブ2の内径の各々と略同一寸法の内径を有している。圧入部32は、また、チューブ2の内径よりも大きい寸法の外径を有している。 The press-fitting portion 32 is formed in a tubular shape, and projects from the fitting portion 31 in one axial direction of the inner ring 6 so that the press-fitting portion 32 can be press-fitted into one end portion 3 in the longitudinal direction of the tube 2. The press-fitting portion 32 is formed in a cylindrical shape in which the outer diameter and the inner diameter change. The press-fitting portion 32 has an inner diameter substantially the same as the inner diameter of the fitting portion 31 and the inner diameter of the tube 2. The press-fitting portion 32 also has an outer diameter larger than the inner diameter of the tube 2.

圧入部32は、第4流体流路42を有している。第4流体流路42は、インナーリング6の流体流路37に含まれる。第4流体流路42は、圧入部32の筒孔(リング孔40)から構成され、インナーリング6(圧入部32)の軸心方向に沿って延びるように、圧入部32に設けられている。第4流体流路42は、第3流体流路41と略同一の流路断面積を有し、第3流体流路41と連続して形成されている。 The press-fitting portion 32 has a fourth fluid flow path 42. The fourth fluid flow path 42 is included in the fluid flow path 37 of the inner ring 6. The fourth fluid flow path 42 is composed of a tubular hole (ring hole 40) of the press-fitting portion 32, and is provided in the press-fitting portion 32 so as to extend along the axial direction of the inner ring 6 (press-fitting portion 32). .. The fourth fluid flow path 42 has substantially the same flow path cross-sectional area as the third fluid flow path 41, and is formed continuously with the third fluid flow path 41.

第4流体流路42は、第3流体流路41と同軸上に連続して形成されている。第4流体流路42は、チューブ2の流体流路39と同軸上に配置された状態で接続部分を介して連通されるようになっている。そして、第4流体流路42は、第3流体流路41と略同一の流路断面積に加えて、チューブ2の流体流路39の流路断面積と略同一の流路断面積を有している。 The fourth fluid flow path 42 is formed coaxially and continuously with the third fluid flow path 41. The fourth fluid flow path 42 is arranged coaxially with the fluid flow path 39 of the tube 2 and communicates with the fourth fluid flow path 42 via a connecting portion. Then, the fourth fluid flow path 42 has a flow path cross-sectional area substantially the same as the flow path cross-sectional area of the fluid flow path 39 of the tube 2 in addition to the flow path cross-sectional area substantially the same as the third fluid flow path 41. doing.

外側突出部33は、筒形状に形成されており、継手本体5の溝部14に圧入され得るように嵌合部31からインナーリング6の軸心方向他方へ突設されている。外側突出部33は、溝部14に応じた形状、本実施形態において円筒形状に形成されている。外側突出部33は、溝部14に圧入され得るように、溝部14の径方向幅よりも大きい径方向幅を有している。 The outer protruding portion 33 is formed in a tubular shape, and projects from the fitting portion 31 toward the other side in the axial direction of the inner ring 6 so that it can be press-fitted into the groove portion 14 of the joint body 5. The outer protruding portion 33 is formed in a shape corresponding to the groove portion 14 and in a cylindrical shape in the present embodiment. The outer protrusion 33 has a radial width larger than the radial width of the groove 14 so that it can be press-fitted into the groove 14.

詳しくは、外側突出部33は、継手本体5の外側筒部12の内径と同一またはそれよりも大きい外径、および、継手本体5の内側筒部13の外径よりも小さい内径を有している。溝部14への圧入時に内側筒部13と径方向に接触する外側突出部33の内径は、内側筒部13の外径と同様に、インナーリング6の軸心方向に関して、外側突出部33の略全長にわったて略一定に保たれている。 Specifically, the outer protrusion 33 has an outer diameter equal to or larger than the inner diameter of the outer cylinder portion 12 of the joint body 5, and an inner diameter smaller than the outer diameter of the inner cylinder portion 13 of the joint body 5. There is. The inner diameter of the outer protrusion 33 that comes into radial contact with the inner cylinder 13 when press-fitting into the groove 14 is abbreviated as the outer protrusion 33 with respect to the axial direction of the inner ring 6, similar to the outer diameter of the inner cylinder 13. It is kept almost constant over the entire length.

内側突出部34は、筒形状に形成されており、継手本体5の内側筒部13とインナーリング6の軸心方向に接触し得るように、嵌合部31に軸心方向他方へ突設されている。内側突出部34は、外径および内径が変化する円筒形状に形成されている。内側突出部34は、また、内側筒部13と接触する際に外側突出部33との間に内側筒部13をインナーリング6の径方向に挟むように、外側突出部33の径方向内方に配置されている。 The inner protruding portion 34 is formed in a tubular shape, and is projected from the fitting portion 31 toward the other side in the axial direction so that the inner tubular portion 13 of the joint body 5 and the inner ring 6 can come into contact with each other in the axial direction. ing. The inner protruding portion 34 is formed in a cylindrical shape in which the outer diameter and the inner diameter change. The inner protruding portion 34 is also radially inward of the outer protruding portion 33 so as to sandwich the inner tubular portion 13 in the radial direction of the inner ring 6 with the outer protruding portion 33 when it comes into contact with the inner tubular portion 13. Is located in.

内側突出部34は、その突出端部(軸心方向他方の端部)45が外側突出部33の突出端部(軸心方向他方の端部)46よりもインナーリング6の軸心方向一方側に位置するように、嵌合部31の軸心方向他方の端部に設けられている。 The protruding end portion (the other end in the axial direction) 45 of the inner protruding portion 34 is one side in the axial direction of the inner ring 6 with respect to the protruding end portion (the other end in the axial direction) 46 of the outer protruding portion 33. It is provided at the other end of the fitting portion 31 in the axial direction so as to be located at.

内側突出部34は、円筒形状に形成されている。内側突出部34は、嵌合部31の内径以上の内径を有している。内側突出部34は、また、継手本体5の内側筒部13の内径(突出端部22の内径を除く)以上の内径を有している。内側突出部34は、嵌合部31が継手本体5の外側筒部12の内側に嵌合されたとき、継手本体5の内側筒部13と同軸上に配置されるようになっている。 The inner protrusion 34 is formed in a cylindrical shape. The inner protruding portion 34 has an inner diameter equal to or larger than the inner diameter of the fitting portion 31. The inner protruding portion 34 also has an inner diameter equal to or larger than the inner diameter of the inner tubular portion 13 of the joint body 5 (excluding the inner diameter of the protruding end portion 22). The inner protruding portion 34 is arranged coaxially with the inner tubular portion 13 of the joint main body 5 when the fitting portion 31 is fitted inside the outer tubular portion 12 of the joint main body 5.

内側突出部34は、第5流体流路48を有している。第5流体流路48は、インナーリング6の流体流路37に含まれる。第5流体流路48は、内側突出部34の筒孔(リング孔40)から構成され、インナーリング6(内側突出部34)の軸心方向に沿って延びるように、内側突出部34に設けられている。第5流体流路48は、第3流体流路41と略同一の流路断面積を有し、第3流体流路41と連続して形成されている。 The inner protrusion 34 has a fifth fluid flow path 48. The fifth fluid flow path 48 is included in the fluid flow path 37 of the inner ring 6. The fifth fluid flow path 48 is composed of a tubular hole (ring hole 40) of the inner protrusion 34, and is provided in the inner protrusion 34 so as to extend along the axial direction of the inner ring 6 (inner protrusion 34). Has been done. The fifth fluid flow path 48 has substantially the same flow path cross-sectional area as the third fluid flow path 41, and is formed continuously with the third fluid flow path 41.

第5流体流路48は、第3流体流路41と同軸上に連続して形成されている。第5流体流路48は、継手本体5の内側筒部13の第2流体流路24と同軸上に配置された状態で接続部分を介して連通されるようになっている。そして、第5流体流路48は、第3流体流路41と略同一の流路断面積に加えて、内側筒部13の第2流体流路24の流路断面積と略同一の流路断面積を有している。 The fifth fluid flow path 48 is formed coaxially and continuously with the third fluid flow path 41. The fifth fluid flow path 48 is arranged coaxially with the second fluid flow path 24 of the inner tubular portion 13 of the joint body 5 and communicates with the fifth fluid flow path 48 via the connecting portion. The fifth fluid flow path 48 has substantially the same flow path cross-sectional area as the third fluid flow path 41, and has substantially the same flow path cross-sectional area as the second fluid flow path 24 of the inner cylinder portion 13. It has a cross-sectional area.

内側突出部34は、第2シール面49を備えている。第2シール面49は、内側突出部34の突出端部45の外周部の全周にわたって形成されている環状のテーパ面であり、第1シール面26と当接可能に形成されている。第2シール面49は、内側突出部34の突出端部45の外径がインナーリング6の軸心方向一方から軸心方向他方へ向かうに従って縮小するように、内側突出部34の外周部に設けられている。 The inner protruding portion 34 includes a second sealing surface 49. The second sealing surface 49 is an annular tapered surface formed over the entire circumference of the outer peripheral portion of the protruding end portion 45 of the inner protruding portion 34, and is formed so as to be in contact with the first sealing surface 26. The second seal surface 49 is provided on the outer peripheral portion of the inner protruding portion 34 so that the outer diameter of the protruding end portion 45 of the inner protruding portion 34 decreases from one axial direction to the other axial direction of the inner ring 6. Has been done.

ユニオンナット7は、ナット本体51と、第2螺合部52と、押圧部53とを備えている。ユニオンナット7は、また、継手本体5の外側筒部12およびチューブ2に対して相対移動可能なようにこれら双方を包囲するための開口部を備えている。この開口部は、ユニオンナット7の軸心方向に延びるように当該ユニオンナット7の中心部に設けられている。 The union nut 7 includes a nut body 51, a second screw portion 52, and a pressing portion 53. The union nut 7 also includes an opening for enclosing both the outer tubular portion 12 of the joint body 5 and the tube 2 so that they can move relative to each other. This opening is provided in the central portion of the union nut 7 so as to extend in the axial direction of the union nut 7.

ユニオンナット7は、チューブ2に対してその軸心方向に相対移動可能に外嵌され、チューブ2に外嵌された状態で継手本体5の外側筒部12に外周側から装着され得るように構成されている。ユニオンナット7は、所定の樹脂、例えば、PFA、PVDF、ETFE、FEPまたはPTFE等のフッ素樹脂を用いて製造されている。 The union nut 7 is externally fitted to the tube 2 so as to be relatively movable in the axial direction thereof, and can be attached to the outer tubular portion 12 of the joint body 5 from the outer peripheral side in a state of being externally fitted to the tube 2. Has been done. The union nut 7 is manufactured using a predetermined resin, for example, a fluororesin such as PFA, PVDF, ETFE, FEP or PTFE.

ナット本体51は、筒形状に形成されている。ナット本体51は、第1包囲部55と、第2包囲部56とを含んでいる。第1包囲部55は、チューブ2に遊嵌可能なように円筒形状に形成されている。第2包囲部56は、継手本体5の外側筒部12に締め付けられ得るように円筒形状に形成されている。第2包囲部56は、第1包囲部55に対して軸方向他方側に同軸的に延設された状態で形成されている。 The nut body 51 is formed in a tubular shape. The nut body 51 includes a first siege 55 and a second siege 56. The first surrounding portion 55 is formed in a cylindrical shape so that it can be loosely fitted to the tube 2. The second surrounding portion 56 is formed in a cylindrical shape so that it can be tightened to the outer tubular portion 12 of the joint body 5. The second surrounding portion 56 is formed in a state of being coaxially extended on the other side in the axial direction with respect to the first surrounding portion 55.

第2螺合部52は、継手本体5の第1螺合部15に螺合し得るようにナット本体51の内周部に設けられている。第2螺合部52は、本実施形態においては、第1螺合部15の雄ねじに対応する雌ねじである。この雌ねじは、第1螺合部15の雄ねじに螺合すべく、ナット本体51の軸心方向に沿って延びるように、ナット本体51の第2包囲部56の内周部に設けられている。 The second screwed portion 52 is provided on the inner peripheral portion of the nut main body 51 so that it can be screwed into the first screwed portion 15 of the joint main body 5. In the present embodiment, the second screw portion 52 is a female screw corresponding to the male screw of the first screw portion 15. This female screw is provided on the inner peripheral portion of the second surrounding portion 56 of the nut body 51 so as to extend along the axial direction of the nut body 51 so as to be screwed into the male screw of the first screwed portion 15. ..

押圧部53は、第1螺合部15に対する第2螺合部52の螺進に伴ってインナーリング6の圧入部32を圧入したチューブ2を当該圧入部32に向かって押圧し得るように構成されている。押圧部53は、環状に形成されている。押圧部53は、ナット本体51の第1包囲部55の内周部の軸心方向他方の端部に設けられている。 The pressing portion 53 is configured so that the tube 2 press-fitted into the press-fitting portion 32 of the inner ring 6 can be pressed toward the press-fitting portion 32 as the second screwing portion 52 is screwed against the first screwing portion 15. Has been done. The pressing portion 53 is formed in an annular shape. The pressing portion 53 is provided at the other end in the axial direction of the inner peripheral portion of the first surrounding portion 55 of the nut body 51.

押圧部53は、第1包囲部55の径方向内方でかつ軸心方向他方へ臨む角部を含んでいる。そして、押圧部53は、第1螺合部15に対する第2螺合部52の螺進によって、インナーリング6の圧入部32を圧入した状態のチューブ2の長手方向一端部3(更には、圧入部32)を樹脂製管継手1の軸心方向他方へ押圧すべく、圧入部32に近接するようになっている。 The pressing portion 53 includes a corner portion of the first surrounding portion 55 that faces inward in the radial direction and toward the other in the axial direction. Then, the pressing portion 53 is a one end portion 3 in the longitudinal direction (further press-fitting) of the tube 2 in a state where the press-fitting portion 32 of the inner ring 6 is press-fitted by the screwing of the second screwing portion 52 with respect to the first screwing portion 15. The portion 32) is brought close to the press-fitting portion 32 in order to press the resin pipe joint 1 toward the other side in the axial direction.

このような構成により、樹脂製管継手1をチューブ2の長手方向一端部3と接合することができる。すなわち、その接合時には、ユニオンナット7がチューブ2に対してその軸心方向に相対移動可能なように、ユニオンナット7をチューブ2に外嵌する。それと前後して、インナーリング6の圧入部32を、チューブ2の長手方向一端部3に圧入する。 With such a configuration, the resin pipe joint 1 can be joined to the longitudinal end portion 3 of the tube 2. That is, at the time of joining, the union nut 7 is fitted onto the tube 2 so that the union nut 7 can move relative to the tube 2 in the axial direction thereof. Around that time, the press-fitting portion 32 of the inner ring 6 is press-fitted into the longitudinal end portion 3 of the tube 2.

次に、インナーリング6の外側突出部33を継手本体5の外側筒部12にその受口から挿入する。この際、インナーリング6の外側突出部33が継手本体5の溝部14に差し込まれ、かつ、インナーリング6の内側突出部34が継手本体5の内側筒部13に近接するように、インナーリング6の嵌合部31を外側筒部12の内側に嵌合させる。 Next, the outer protruding portion 33 of the inner ring 6 is inserted into the outer tubular portion 12 of the joint body 5 from its receiving port. At this time, the inner ring 6 is inserted so that the outer protruding portion 33 of the inner ring 6 is inserted into the groove portion 14 of the joint main body 5 and the inner protruding portion 34 of the inner ring 6 is close to the inner tubular portion 13 of the joint main body 5. Fitting portion 31 is fitted inside the outer tubular portion 12.

次に、ユニオンナット7の第2螺合部52が継手本体5の第1螺合部15に螺合するように、ユニオンナット7のナット本体51の軸心方向他方の端部を継手本体5の外側筒部12の軸心方向一方の端部に外嵌する。最後に、ユニオンナット7を継手本体5に対して相対回転させながら、第2螺合部52を第1螺合部15に対して螺進させることによって、ユニオンナット7を継手本体5に対して締め付ける。その結果、樹脂製管継手1をチューブ2の長手方向一端部3と接合することができる。 Next, the other end of the nut body 51 of the union nut 7 in the axial direction is screwed to the first screwed portion 15 of the joint body 5 so that the second screwed portion 52 of the union nut 7 is screwed into the first screwed portion 15 of the joint body 5. Outerly fitted to one end of the outer tubular portion 12 in the axial direction. Finally, the union nut 7 is screwed with respect to the first screwed portion 15 while the union nut 7 is rotated relative to the joint body 5, so that the union nut 7 is screwed with respect to the joint body 5. tighten. As a result, the resin pipe joint 1 can be joined to the longitudinal end 3 of the tube 2.

そしてこのように樹脂製管継手1がチューブ2の長手方向一端部3と接合した後の状態においては、複数のシール部を形成することができる。これらのシール部は、樹脂製管継手1の流体流路(継手本体5の流体流路18、インナーリング6の流体流路37)およびチューブ2の流体流路39を流れる流体が、当該流体流路外へ漏れ出ることを防止するためのものである。 Then, in the state after the resin pipe joint 1 is joined to the longitudinal end portion 3 of the tube 2 in this way, a plurality of seal portions can be formed. In these seal portions, the fluid flowing through the fluid flow path of the resin pipe joint 1 (fluid flow path 18 of the joint body 5 and the fluid flow path 37 of the inner ring 6) and the fluid flow path 39 of the tube 2 is the fluid flow. This is to prevent leakage to the outside of the road.

詳しくは、前記複数のシール部は、継手本体5とインナーリング6との間をシールする第1シール部61および第2シール部62と、インナーリング6とチューブ2の長手方向一端部3との間をシールする第3シール部63を含む。第1シール部61は、前述の接合後の状態では外側突出部33が溝部14に圧入されるので、外側突出部33と溝部14との間に形成される。 Specifically, the plurality of seal portions are the first seal portion 61 and the second seal portion 62 that seal between the joint body 5 and the inner ring 6, and the inner ring 6 and the longitudinal end portion 3 of the tube 2. The third sealing portion 63 for sealing the space is included. The first seal portion 61 is formed between the outer protruding portion 33 and the groove portion 14 because the outer protruding portion 33 is press-fitted into the groove portion 14 in the state after the above-mentioned joining.

第2シール部62は、前述の接合後の状態では内側突出部34の第2シール面49が内側筒部13の第1シール面26に圧接するので、内側筒部13と内側突出部34との間に形成される。第3シール部63は、前述の接合後の状態ではユニオンナット7の押圧部53がチューブ2を圧入部32に向かって押圧するので、圧入部32とチューブ2の長手方向一端部3との間に形成される。 In the second seal portion 62, since the second seal surface 49 of the inner protruding portion 34 is in pressure contact with the first seal surface 26 of the inner cylinder portion 13 in the state after the above-mentioned joining, the inner cylinder portion 13 and the inner protruding portion 34 are in contact with each other. Is formed between. In the third seal portion 63, since the pressing portion 53 of the union nut 7 presses the tube 2 toward the press-fitting portion 32 in the above-mentioned state after joining, between the press-fitting portion 32 and the longitudinal end portion 3 of the tube 2. Is formed in.

図2は、樹脂製管継手1におけるインナーリング6の断面図である。図3は、図2のインナーリング6の内側突出部34付近の断面図である。 FIG. 2 is a cross-sectional view of the inner ring 6 in the resin pipe joint 1. FIG. 3 is a cross-sectional view of the inner ring 6 of FIG. 2 in the vicinity of the inner protruding portion 34.

継手本体5の内側筒部13の内周部およびインナーリング6の内側突出部34の内周部は、それぞれ、当該内側筒部13と当該内側突出部34との接触によって互いに連通する流体流路の流路壁を構成する。ここでは、継手本体5の内側筒部13の内周部に第2流体流路24の流路壁が設けられ、インナーリング6の内側突出部34の内周部に第5流体流路48の流路壁が設けられている。 The inner peripheral portion of the inner tubular portion 13 of the joint body 5 and the inner peripheral portion of the inner protruding portion 34 of the inner ring 6 communicate with each other by contact between the inner tubular portion 13 and the inner protruding portion 34, respectively. Consists of the flow path wall of. Here, the flow path wall of the second fluid flow path 24 is provided on the inner peripheral portion of the inner tubular portion 13 of the joint body 5, and the fifth fluid flow path 48 is provided on the inner peripheral portion of the inner protruding portion 34 of the inner ring 6. A flow path wall is provided.

図2に示すように、内側突出部34の突出端部45は、継手本体5の内側筒部13の最小内径D0以上の内径を有している。そして、図2および図3に示すように、内側突出部34の軸心方向他方(突出端部45側)から軸心方向一方(嵌合部31側)へ向かうに従って内側突出部34の内径を縮小させる第1内周面71が、内側突出部34の内周部に備えられている。 As shown in FIG. 2, the protruding end portion 45 of the inner protruding portion 34 has an inner diameter equal to or larger than the minimum inner diameter D0 of the inner tubular portion 13 of the joint body 5. Then, as shown in FIGS. 2 and 3, the inner diameter of the inner protruding portion 34 is increased from the other in the axial direction (the protruding end 45 side) to the one in the axial direction (the fitting portion 31 side) of the inner protruding portion 34. A first inner peripheral surface 71 to be reduced is provided on the inner peripheral portion of the inner protruding portion 34.

本実施形態において、第1内周面71は、第5流体流路48の流路壁の一部の壁面を形成し得るものであり、インナーリング6のリング孔40に臨むように内側突出部34の内周部の全周にわたって環状に形成されている。第1内周面71は、内側突出部34の内周部のうち軸心方向他方(突出端部45側)の一部で、内側突出部34の軸心方向(インナーリング6の軸心方向)において突出端部45に向かって拡がるように、突出端部45寄りに配置されている。 In the present embodiment, the first inner peripheral surface 71 can form a part of the wall surface of the flow path wall of the fifth fluid flow path 48, and the inner protrusion portion so as to face the ring hole 40 of the inner ring 6. It is formed in a ring shape over the entire circumference of the inner peripheral portion of 34. The first inner peripheral surface 71 is a part of the inner peripheral portion of the inner protruding portion 34 in the axial direction other (the protruding end 45 side), and is the axial direction of the inner protruding portion 34 (the axial direction of the inner ring 6). ), It is arranged closer to the protruding end 45 so as to expand toward the protruding end 45.

第1内周面71は、テーパ面である。第1内周面71は、インナーリング6の軸心66を含む断面において(図2および図3参照)、軸心66と平行に延びる仮想線75に対して所定の角度Θ1傾斜するように形成されている。内側突出部34は、軸心方向他方側(突出端部45側)で最大内径D2を有し、内側突出部34の軸心方向一方側で最小内径D1を有している。 The first inner peripheral surface 71 is a tapered surface. The first inner peripheral surface 71 is formed so as to be inclined by a predetermined angle Θ1 with respect to the virtual line 75 extending parallel to the axis 66 in the cross section including the axis 66 of the inner ring 6 (see FIGS. 2 and 3). Has been done. The inner protruding portion 34 has a maximum inner diameter D2 on the other side in the axial direction (the protruding end 45 side), and has a minimum inner diameter D1 on one side in the axial direction of the inner protruding portion 34.

内側突出部34の最大内径D2は、本実施形態においては内側突出部34のうちの突出端部45の内径に相当するものであり、内側筒部13の最小内径D0よりも大きく設定されている。そのため、突出端部45は、外側突出部33が継手本体5の外側筒部12にその受口から挿入された時点では、第1シール面26の径方向中途部と対向するようになっている。 In the present embodiment, the maximum inner diameter D2 of the inner protruding portion 34 corresponds to the inner diameter of the protruding end portion 45 of the inner protruding portion 34, and is set to be larger than the minimum inner diameter D0 of the inner cylinder portion 13. .. Therefore, the protruding end portion 45 is opposed to the radial middle portion of the first sealing surface 26 when the outer protruding portion 33 is inserted into the outer tubular portion 12 of the joint body 5 from its receiving port. ..

本実施形態において、連通接続すべく内側突出部34と隣接する継手本体5の内側筒部13は、内側突出部34の最小内径D1と略同一寸法の最小内径D0を有している。また、内側突出部34に連なる嵌合部31も、内側突出部34の最小内径D1と略同一寸法の内径を有している。なお、内側突出部34の最小内径D1と内側筒部13の最小内径D0との関係はこれに限定するものではなく、内側突出部34の最小内径D1は、流体の流れを妨げない程度であれば内側筒部13の内径よりも大きくても小さくてもよい。 In the present embodiment, the inner tubular portion 13 of the joint body 5 adjacent to the inner protruding portion 34 for communication connection has a minimum inner diameter D0 having substantially the same dimensions as the minimum inner diameter D1 of the inner protruding portion 34. Further, the fitting portion 31 connected to the inner protruding portion 34 also has an inner diameter substantially the same as the minimum inner diameter D1 of the inner protruding portion 34. The relationship between the minimum inner diameter D1 of the inner protrusion 34 and the minimum inner diameter D0 of the inner cylinder 13 is not limited to this, and the minimum inner diameter D1 of the inner protrusion 34 should not interfere with the flow of fluid. For example, it may be larger or smaller than the inner diameter of the inner cylinder portion 13.

第1内周面71が直線状テーパ面である場合には、第1内周面71とそれに連なる軸心方向一方側の内周面との境界部は、滑らかな湾曲面(丸面取り)に形成されている。 When the first inner peripheral surface 71 is a linear tapered surface, the boundary between the first inner peripheral surface 71 and the inner peripheral surface on one side in the axial direction connected to the first inner peripheral surface 71 is a smooth curved surface (round chamfer). It is formed.

内側突出部34は、可撓性を有している。内側突出部34は、内側突出部34と嵌合部31との境界部分を支点として突出端部45がインナーリング6の径方向内方へ移動するように、即ち前記所定の角度Θ1が小さくなるように変形可能とされている。この変形時には、第1内周面71が嵌合部31の内周面78の延長線79上に位置する(前記角度Θ1が0℃となる)ことが好ましい。 The inner protrusion 34 has flexibility. In the inner protruding portion 34, the protruding end portion 45 moves inward in the radial direction of the inner ring 6 with the boundary portion between the inner protruding portion 34 and the fitting portion 31 as a fulcrum, that is, the predetermined angle Θ1 becomes smaller. It is said that it can be transformed. At the time of this deformation, it is preferable that the first inner peripheral surface 71 is located on the extension line 79 of the inner peripheral surface 78 of the fitting portion 31 (the angle Θ1 is 0 ° C.).

このような構成において、図4(a)に示すように継手本体5に対して分離状態にあるインナーリング6の外側突出部33が、図4(b)に示すように継手本体5の溝部14に圧入されたとき、継手本体5の内側筒部13が外側突出部33により径方向内方へ押される。そのため、外側突出部33との間に内側筒部13を径方向に挟む内側突出部34が、内側筒部13により径方向内方へ押される。 In such a configuration, the outer protruding portion 33 of the inner ring 6 separated from the joint main body 5 as shown in FIG. 4 (a) is the groove portion 14 of the joint main body 5 as shown in FIG. 4 (b). When press-fitted into, the inner tubular portion 13 of the joint body 5 is pushed inward in the radial direction by the outer protruding portion 33. Therefore, the inner protruding portion 34 that sandwiches the inner tubular portion 13 in the radial direction with the outer protruding portion 33 is pushed inward in the radial direction by the inner tubular portion 13.

これにより、内側突出部34が、第1内周面71がインナーリング6の径方向内方へ移動するように変形する。この際、突出端部45に向かって拡径するテーパ面であった第1内周面71が、縮径する(軸心方向に平行となる)ように変形する。すなわち、第1内周面71が内側突出部34の軸心方向一方から軸心方向他方へ向かうに従って内側突出部34の内径を縮小させるものであることから、内側突出部34がインナーリング6の流体流路37(第5流体流路48)内へ突出するように変形することは抑止できる。 As a result, the inner protruding portion 34 is deformed so that the first inner peripheral surface 71 moves inward in the radial direction of the inner ring 6. At this time, the first inner peripheral surface 71, which was a tapered surface whose diameter increases toward the protruding end portion 45, is deformed so as to be reduced in diameter (parallel to the axial direction). That is, since the first inner peripheral surface 71 reduces the inner diameter of the inner protruding portion 34 from one axial direction of the inner protruding portion 34 toward the other in the axial direction, the inner protruding portion 34 is the inner ring 6. Deformation so as to protrude into the fluid flow path 37 (fifth fluid flow path 48) can be suppressed.

したがって、樹脂製管継手1がチューブ2の長手方向一端部3と接合された後の状態で、流体が継手本体5とインナーリング6との間を流れる際、継手本体5とインナーリング6との連通領域において、流体の流れを妨げるものを存在させずに済み、流体の円滑な流れを確保することができる。よって、継手本体5とインナーリング6との間を流れる流体の置換性の低下を防止できる。 Therefore, when the fluid flows between the joint body 5 and the inner ring 6 in the state after the resin pipe joint 1 is joined to the longitudinal end 3 of the tube 2, the joint body 5 and the inner ring 6 are connected to each other. In the communication region, it is not necessary to have anything obstructing the flow of the fluid, and a smooth flow of the fluid can be ensured. Therefore, it is possible to prevent a decrease in the replaceability of the fluid flowing between the joint body 5 and the inner ring 6.

なお、本発明におけるインナーリング6の内側突出部34の内周面は、本実施形態においてはテーパ面である第1内周面71としているが、これに限定されるものではなく、例えば、図5に示すように、インナーリング6の軸心66を含む断面において、インナーリング6の径方向内方側へ向かって凸となる凸曲面である別の第1内周面81としてもよい。 The inner peripheral surface of the inner protruding portion 34 of the inner ring 6 in the present invention is the first inner peripheral surface 71 which is a tapered surface in the present embodiment, but the present invention is not limited to this, and for example, FIG. As shown in 5, another first inner peripheral surface 81, which is a convex curved surface that becomes convex inward in the radial direction of the inner ring 6, may be used in the cross section including the axial center 66 of the inner ring 6.

これによれば、インナーリング6の外側突出部33が継手本体5の溝部14に圧入されたとき、別の第1内周面81を、第1内周面71に比べて滑らかな面に、即ち内側突出部34の第5流体流路48の流路断面積をより正確に一定に保たせ得る面に変化させることができる。したがって、インナーリング6の流体流路37において、流体の円滑な流れの促進を図ることができる。 According to this, when the outer protruding portion 33 of the inner ring 6 is press-fitted into the groove portion 14 of the joint body 5, another first inner peripheral surface 81 is made smoother than the first inner peripheral surface 71. That is, the cross-sectional area of the fifth fluid flow path 48 of the inner protrusion 34 can be changed to a surface that can be kept more accurately and constant. Therefore, the smooth flow of the fluid can be promoted in the fluid flow path 37 of the inner ring 6.

なお、本発明におけるインナーリングの内側突出部の内周面は、本実施形態においては内側突出部34の内周部のうち軸心方向他方(突出端部45側)の一部に配置された第1内周面71としているが、これに限定されるものではなく、例えば、内側突出部34の軸心方向に関して当該内側突出部34の内周部の略全域にわたって拡がる内周面としてもよい。 In the present embodiment, the inner peripheral surface of the inner ring protruding portion in the present invention is arranged on a part of the inner peripheral portion of the inner protruding portion 34 on the other side in the axial direction (protruding end portion 45 side). Although the first inner peripheral surface 71 is used, the present invention is not limited to this, and for example, the inner peripheral surface may be an inner peripheral surface that extends over substantially the entire inner peripheral portion of the inner protruding portion 34 with respect to the axial direction of the inner protruding portion 34. ..

なお、本発明におけるインナーリングの内側突出部の内周面は、インナーリングの軸心を含む断面において、本実施形態においては前記所定の角度Θ1のみを有する第1内周面71としているが、これに限定されるものではなく、例えば、互いに異なる角度(軸心に対する傾斜角度)を有する複数の内周面からなるまた別の内周面としてもよい。 The inner peripheral surface of the inner protruding portion of the inner ring in the present invention is the first inner peripheral surface 71 having only the predetermined angle Θ1 in the present embodiment in the cross section including the axis of the inner ring. The present invention is not limited to this, and for example, another inner peripheral surface composed of a plurality of inner peripheral surfaces having different angles (inclination angles with respect to the axis) may be used.

また、本実施形態において、図1および図2に示すように、インナーリング6の圧入部32が、傾斜部101を有している。傾斜部101は、継手本体5の第1螺合部15に対するユニオンナット7の第2螺合部52の螺進時にチューブ2を介してユニオンナット7の押圧部53を受け止めるためのものである。傾斜部101は、径方向外方へ膨出する圧入部32の膨出部102に含まれている。 Further, in the present embodiment, as shown in FIGS. 1 and 2, the press-fitting portion 32 of the inner ring 6 has an inclined portion 101. The inclined portion 101 is for receiving the pressing portion 53 of the union nut 7 via the tube 2 when the second screwed portion 52 of the union nut 7 is screwed with respect to the first screwed portion 15 of the joint body 5. The inclined portion 101 is included in the bulging portion 102 of the press-fitting portion 32 that bulges outward in the radial direction.

傾斜部101は、インナーリング6の軸心方向他方(嵌合部31側)から軸心方向一方へ向かうに従って外径が縮小するように、圧入部32の突出端部(軸心方向一方の端部)105の外周部に設けられている。詳しくは、傾斜部101は、チューブの長手方向一端部3の内周面を拡径できるように構成されている。傾斜部101は、圧入部32の外周部の全周にわたって環状に形成されている。 The inclined portion 101 has a protruding end portion (one end in the axial direction) of the press-fitting portion 32 so that the outer diameter decreases from the other (fitting portion 31 side) in the axial direction of the inner ring 6 toward one in the axial direction. Part) It is provided on the outer peripheral part of 105. Specifically, the inclined portion 101 is configured so that the inner peripheral surface of one end portion 3 in the longitudinal direction of the tube can be enlarged in diameter. The inclined portion 101 is formed in an annular shape over the entire circumference of the outer peripheral portion of the press-fitting portion 32.

傾斜部101は、テーパ面または凸曲面である。傾斜部101は、インナーリング6の軸心66に対して所定の角度で傾斜するように形成されている。または、所定の曲率半径で湾曲するように形成されている。傾斜部101は、樹脂製管継手1の軸心方向に沿って進むユニオンナット7の押圧部53を傾斜面または湾曲面で受け止めるので、押圧部53からの押圧力を軸心方向と径方向とに分散させるようになっている。 The inclined portion 101 is a tapered surface or a convex curved surface. The inclined portion 101 is formed so as to be inclined at a predetermined angle with respect to the axial center 66 of the inner ring 6. Alternatively, it is formed so as to be curved with a predetermined radius of curvature. Since the inclined portion 101 receives the pressing portion 53 of the union nut 7 traveling along the axial direction of the resin pipe joint 1 on the inclined surface or the curved surface, the pressing force from the pressing portion 53 is in the axial direction and the radial direction. It is designed to be distributed to.

図6は、図2のインナーリング6の圧入部32付近の断面図である。 FIG. 6 is a cross-sectional view of the inner ring 6 of FIG. 2 in the vicinity of the press-fitting portion 32.

図2および図6に示すように、インナーリング6の圧入部32は、第2内周面112および第3内周面113を更に有している。第2内周面112は、インナーリング6の軸心方向一方から軸心方向他方(嵌合部31側)へ向かうに従って突出端部105の内径を縮小させるように、圧入部32の突出端部105の内周部に設けられている。 As shown in FIGS. 2 and 6, the press-fitting portion 32 of the inner ring 6 further has a second inner peripheral surface 112 and a third inner peripheral surface 113. The second inner peripheral surface 112 is a protruding end portion of the press-fitting portion 32 so that the inner diameter of the protruding end portion 105 is reduced from one axial direction to the other (fitting portion 31 side) of the inner ring 6. It is provided on the inner peripheral portion of 105.

本実施形態において、第2内周面112は、インナーリング6のリング孔40に臨むように突出端部105の内周部の全周わたって環状に形成されている。第2内周面112は、突出端部105の内周部のうち最も軸心方向一方側(突出端部105側)の一部で、圧入部32の軸心方向(インナーリング6の軸心方向)において先端部114に向かって拡がるように、突出端部105寄りに配置されている。 In the present embodiment, the second inner peripheral surface 112 is formed in an annular shape over the entire inner peripheral portion of the protruding end portion 105 so as to face the ring hole 40 of the inner ring 6. The second inner peripheral surface 112 is a part of the inner peripheral portion of the protruding end portion 105 on one side in the axial direction (the protruding end 105 side), and is the axial direction of the press-fitting portion 32 (the axial center of the inner ring 6). It is arranged closer to the protruding end 105 so as to expand toward the tip 114 in the direction).

第2内周面112は、テーパ面である。第2内周面112は、インナーリング6の軸心66を含む断面において(図2および図6参照)、軸心66と平行に延びる仮想線115に対して所定の角度Θ2傾斜するように形成されている。突出端部105のうち第2内周面112を含む領域は、軸心方向一方側で最大内径D3を有し、軸心方向他方側(第3内周面113側)で最小内径D4を有している。 The second inner peripheral surface 112 is a tapered surface. The second inner peripheral surface 112 is formed so as to be inclined at a predetermined angle Θ2 with respect to the virtual line 115 extending parallel to the axis 66 in the cross section including the axis 66 of the inner ring 6 (see FIGS. 2 and 6). Has been done. The region of the protruding end 105 including the second inner peripheral surface 112 has a maximum inner diameter D3 on one side in the axial direction and a minimum inner diameter D4 on the other side in the axial direction (third inner peripheral surface 113 side). doing.

第3内周面113は、インナーリング6の軸心方向一方から軸心方向他方(嵌合部31側)へ向かうに従って圧入部32の突出端部105の内径を縮小させるように、圧入部32の突出端部105の内周部に設けられている。第3内周面113は、図6に示すように、第2内周面112の勾配よりも小さい勾配を有し、第2内周面112の軸心方向他方でかつ傾斜部101の径方向内方に配置されている。 The third inner peripheral surface 113 has a press-fitting portion 32 such that the inner diameter of the protruding end portion 105 of the press-fitting portion 32 is reduced from one axial direction to the other (fitting portion 31 side) of the inner ring 6. It is provided on the inner peripheral portion of the protruding end portion 105 of the above. As shown in FIG. 6, the third inner peripheral surface 113 has a gradient smaller than the gradient of the second inner peripheral surface 112, and is the axial direction of the second inner peripheral surface 112 and the radial direction of the inclined portion 101. It is located inside.

本実施形態において、第3内周面113は、インナーリング6のリング孔40に臨むように突出端部105の内周部の全周わたって環状に形成されている。第3内周面113は、突出端部105の内周部のうち軸心方向他方側(嵌合部31側)の一部で、圧入部32の軸心方向(インナーリング6の軸心方向)において先端部114に向かって拡がるように、反突出端部105寄りに配置されている。 In the present embodiment, the third inner peripheral surface 113 is formed in an annular shape over the entire inner peripheral portion of the protruding end portion 105 so as to face the ring hole 40 of the inner ring 6. The third inner peripheral surface 113 is a part of the inner peripheral portion of the protruding end portion 105 on the other side in the axial direction (fitting portion 31 side), and is in the axial direction of the press-fitting portion 32 (axial direction of the inner ring 6). ), It is arranged closer to the anti-protruding end 105 so as to expand toward the tip 114.

第3内周面113は、テーパ面である。第3内周面113は、インナーリング6の軸心66を含む断面において(図2および図6参照)、軸心66と平行に延びる仮想線116に対して所定の角度Θ3傾斜するように形成されている。突出端部105のうち第3内周面113を含む領域は、軸心方向一方側で最大内径D4を有し、軸心方向他方側(第3内周面113側)で最小内径D1を有している。 The third inner peripheral surface 113 is a tapered surface. The third inner peripheral surface 113 is formed so as to be inclined at a predetermined angle Θ3 with respect to the virtual line 116 extending parallel to the axis 66 in the cross section including the axis 66 of the inner ring 6 (see FIGS. 2 and 6). Has been done. The region of the protruding end 105 including the third inner peripheral surface 113 has a maximum inner diameter D4 on one side in the axial direction and a minimum inner diameter D1 on the other side in the axial direction (third inner peripheral surface 113 side). doing.

第3内周面113は、第2内周面112の軸心方向他方側に連なって形成されている。第2内周面112および第3内周面113が直線状テーパ面である場合に、第2内周面112とそれに連なる第3内周面113との境界部、および第3内周面とそれに連なる軸心方向他方側の内周面との境界部は、滑らかな湾曲面(丸面取り)に形成されている。 The third inner peripheral surface 113 is formed so as to be continuous with the other side in the axial direction of the second inner peripheral surface 112. When the second inner peripheral surface 112 and the third inner peripheral surface 113 are linear tapered surfaces, the boundary portion between the second inner peripheral surface 112 and the third inner peripheral surface 113 connected thereto, and the third inner peripheral surface The boundary portion with the inner peripheral surface on the other side in the axial direction connected to it is formed as a smooth curved surface (round chamfer).

突出端部105は、可撓性を有している。突出端部105は、圧入部32の突出基部117側を支点として突出端部105がインナーリング6の径方向内方へ移動するように、即ち前記所定の角度Θ3が小さくなるように変形可能とされている。この変形時には、第3内周面113が突出基部117の内周面118の延長線119上に位置する(前記角度Θ3が0℃となる)ことが好ましい。 The protruding end 105 has flexibility. The protruding end 105 can be deformed so that the protruding end 105 moves inward in the radial direction of the inner ring 6 with the protruding base 117 side of the press-fitting portion 32 as a fulcrum, that is, the predetermined angle Θ3 becomes smaller. Has been done. At the time of this deformation, it is preferable that the third inner peripheral surface 113 is located on the extension line 119 of the inner peripheral surface 118 of the protruding base portion 117 (the angle Θ3 is 0 ° C.).

ここで、前記所定の角度Θ3は、第3内周面113の勾配が第2内周面112の勾配よりも小さくなるように、前記所定の角度Θ2よりも小さく設定されている。そして、第4流体流路42において、突出端部105の第2内周面112を含む領域に設けられた流体流路と、突出端部105の第3内周面113を含む領域に設けられた流体流路とが、連続して形成されている。 Here, the predetermined angle Θ3 is set smaller than the predetermined angle Θ2 so that the gradient of the third inner peripheral surface 113 is smaller than the gradient of the second inner peripheral surface 112. Then, in the fourth fluid flow path 42, the fluid flow path is provided in the region including the second inner peripheral surface 112 of the protruding end portion 105, and is provided in the region including the third inner peripheral surface 113 of the protruding end portion 105. The fluid flow path is continuously formed.

このような構成において、図7(a)に示すように継手本体5に対して分離状態にあるユニオンナット7の第2螺合部52が、図7(b)に示すように継手本体5の第1螺合部15に螺合したとき、インナーリング6の圧入部32の傾斜部101がチューブ2を介してユニオンナット7の押圧部53により押される。この際、傾斜部101は、押圧部53の押圧力を傾斜部101に平行な方向と垂直な方向とに分散する。 In such a configuration, the second screwed portion 52 of the union nut 7 separated from the joint body 5 as shown in FIG. 7A is the joint body 5 as shown in FIG. 7B. When screwed into the first screwed portion 15, the inclined portion 101 of the press-fitting portion 32 of the inner ring 6 is pushed by the pressing portion 53 of the union nut 7 via the tube 2. At this time, the inclined portion 101 distributes the pressing force of the pressing portion 53 in the direction parallel to the inclined portion 101 and the direction perpendicular to the inclined portion 101.

これにより、圧入部32の突出端部105が、第2内周面112および第3内周面113がインナーリング6の径方向内方へ移動するように変形する。この際、先端部114に向かって拡径するテーパ面であった第2内周面112および第3内周面113が、縮径する(軸心方向に平行となる)ように変形する。すなわち、第2内周面112および第3内周面113が前述のような形状を有することから、圧入部32の突出端部105がインナーリング6の流体流路37(第4流体流路42)内へ突出するように変形することは抑止できる。 As a result, the protruding end 105 of the press-fitting portion 32 is deformed so that the second inner peripheral surface 112 and the third inner peripheral surface 113 move inward in the radial direction of the inner ring 6. At this time, the second inner peripheral surface 112 and the third inner peripheral surface 113, which are tapered surfaces whose diameters increase toward the tip portion 114, are deformed so as to be reduced in diameter (parallel to the axial direction). That is, since the second inner peripheral surface 112 and the third inner peripheral surface 113 have the above-mentioned shapes, the protruding end portion 105 of the press-fitting portion 32 is the fluid flow path 37 of the inner ring 6 (fourth fluid flow path 42). ) Can be prevented from being deformed so as to protrude inward.

したがって、樹脂製管継手1がチューブ2の長手方向一端部3と接合された後の状態で、流体がチューブ2とインナーリング6との間を流れる際、チューブ2とインナーリング6との連通領域において、流体の流れを妨げるものを存在させずに済み、流体の円滑な流れを確保することができる。よって、チューブ2とインナーリング6との間を流れる流体の置換性の低下も防止できる。 Therefore, when the fluid flows between the tube 2 and the inner ring 6 in the state after the resin pipe joint 1 is joined to the longitudinal end portion 3 of the tube 2, the communication region between the tube 2 and the inner ring 6 is formed. In the above, it is not necessary to have something that obstructs the flow of the fluid, and a smooth flow of the fluid can be ensured. Therefore, it is possible to prevent a decrease in the replaceability of the fluid flowing between the tube 2 and the inner ring 6.

なお、本発明におけるインナーリング6の圧入部32の突出端部105の内周面は、本実施形態においてはテーパ面である第2内周面112および第3内周面113としているが、これに限定されるものではなく、例えば、図8に示すように、インナーリング6の軸心66を含む断面において、インナーリング6の径方向内方側へ向かって凸となる凸曲面である別の第2内周面122および第3内周面123としてもよい。 In the present invention, the inner peripheral surface of the protruding end portion 105 of the press-fitting portion 32 of the inner ring 6 in the present invention is the second inner peripheral surface 112 and the third inner peripheral surface 113, which are tapered surfaces. For example, as shown in FIG. 8, another convex curved surface that is convex inward in the radial direction of the inner ring 6 in a cross section including the axial center 66 of the inner ring 6. The second inner peripheral surface 122 and the third inner peripheral surface 123 may be used.

これによれば、ユニオンナット7が継手本体5に対して締められたとき、別の第2内周面122および第3内周面123を、第2内周面112および第3内周面113に比べて滑らかな面に、即ち圧入部32の突出端部105において第4流体流路42の流路断面積をより正確に一定に保たせ得る面に変化させることができる。したがって、インナーリング6の流体流路37において、流体の円滑な流れの促進を図ることができる。 According to this, when the union nut 7 is tightened with respect to the joint body 5, another second inner peripheral surface 122 and a third inner peripheral surface 123 are provided with the second inner peripheral surface 112 and the third inner peripheral surface 113. It is possible to change the surface to be smoother than that of the above, that is, to a surface where the cross-sectional area of the fourth fluid flow path 42 can be kept more accurately and constant at the protruding end portion 105 of the press-fitting portion 32. Therefore, the smooth flow of the fluid can be promoted in the fluid flow path 37 of the inner ring 6.

なお、本発明におけるインナーリング6の圧入部32の突出端部105の第3内周面は、インナーリングの軸心を含む断面において、本実施形態においては前記所定の角度Θ3のみを有する第3内周面113としているが、これに限定されるものではなく、例えば、互いに異なる角度を有する複数の内周面からなるまた別の内周面としてもよく、この場合には第2内周面112を含ませることも可能である。 In the present invention, the third inner peripheral surface of the protruding end portion 105 of the press-fitting portion 32 of the inner ring 6 has only the predetermined angle Θ3 in the cross section including the axial center of the inner ring. The inner peripheral surface is 113, but the present invention is not limited to this, and for example, another inner peripheral surface composed of a plurality of inner peripheral surfaces having different angles may be used. In this case, the second inner peripheral surface is used. It is also possible to include 112.

上述の教示を考慮すれば、本発明が多くの変更形態および変形形態をとり得ることは明らかである。したがって、本発明が、添付の特許請求の範囲内において、本明細書に記載された以外の方法で実施され得ることを理解されたい。 In view of the above teachings, it is clear that the present invention can take many modified and modified forms. Therefore, it should be understood that the present invention may be practiced in a manner other than that described herein, within the scope of the appended claims.

1 樹脂製管継手
2 チューブ
3 チューブの長手方向一端部
5 継手本体
6 インナーリング
7 ユニオンナット
11 本体筒部
12 外側筒部
13 内側筒部
14 溝部
15 第1螺合部
31 嵌合部
32 圧入部
33 外側突出部
34 内側突出部
51 ナット本体
52 第2螺合部
53 押圧部
71 第1内周面
101 傾斜面
112 第2内周面
113 第3内周面
1 Resin pipe joint 2 Tube 3 One end of the tube in the longitudinal direction 5 Joint body 6 Inner ring 7 Union nut 11 Main body cylinder 12 Outer cylinder 13 Inner cylinder 14 Groove 15 First screwed part 31 Fitting part 32 Press-fitting part 33 Outer protruding part 34 Inner protruding part 51 Nut body 52 Second screwed part 53 Pressing part 71 First inner peripheral surface 101 Inclined surface 112 Second inner peripheral surface 113 Third inner peripheral surface

Claims (1)

チューブの長手方向一端部と接合可能な樹脂製管継手であって、
本体筒部、前記本体筒部にその軸心方向一方へ同軸的に突設された外側筒部、前記外側筒部の径方向内方に配置されかつ前記本体筒部に前記外側筒部と同方向へ同軸的に突設された内側筒部、前記本体筒部の軸心方向一方へ開口するように前記本体筒部と前記外側筒部と前記内側筒部との間に設けられた溝部、および、前記外側筒部の外周部に設けられた第1螺合部を有する継手本体と、
前記継手本体の外側筒部の内側に嵌合され得る筒形状の嵌合部、前記チューブの長手方向一端部に圧入され得るように前記嵌合部に軸心方向一方へ突設された筒形状の圧入部、前記継手本体の溝部に圧入され得るように前記嵌合部に軸心方向他方へ突設された筒形状の外側突出部、および、前記継手本体の内側筒部と軸心方向に接触し得るように前記嵌合部に軸心方向他方へ突設された筒形状の内側突出部であって、前記内側筒部と接触する際に前記外側突出部との間に前記内側筒部を径方向に挟むように前記外側突出部の径方向内方に配置された内側突出部を有するインナーリングと、
筒形状のナット本体、前記継手本体の第1螺合部に螺合し得るように前記ナット本体の内周部に設けられた第2螺合部、前記第1螺合部に対する前記第2螺合部の螺進に伴って前記インナーリングの圧入部を圧入したチューブを前記圧入部に向かって押圧し得るように構成された押圧部を有するユニオンナットとを備え、
前記継手本体の内側筒部の内周部および前記インナーリングの内側突出部の内周部は、当該内側筒部と当該内側突出部との接触によって互いに連通する流体流路の流路壁を構成し、
前記インナーリングの内側突出部の内周部が、
前記内側突出部が前記継手本体の内側筒部から分離された状態では、前記インナーリングの軸心方向他方から軸心方向一方へ向かうに従って内径を縮小させている第1内周面
を含み、
前記インナーリングの圧入部の内周部が、
前記圧入部が前記チューブの長手方向一端部から分離された状態では、前記インナーリングの軸心方向一方から軸心方向他方へ向かうに従って内径を縮小させている第2内周面と、
前記第2内周面の軸心方向他方側に位置し、前記圧入部が前記チューブの長手方向一端部から分離された状態では、前記インナーリングの軸心方向一方から軸心方向他方へ向かうに従って内径を縮小させている、前記第2内周面よりも勾配が小さい第3内周面と
を含み、
前記インナーリングの内側突出部が前記継手本体の内側筒部から分離され、かつ前記インナーリングの圧入部が前記チューブの長手方向一端部から分離された状態では、前記第1内周面の最大内径よりも前記第3内周面の最大内径が大きく、前記第3内周面の最大内径よりも前記第2内周面の最大内径が大きい
ことを特徴とする樹脂製管継手。
A resin fitting that can be joined to one end of the tube in the longitudinal direction.
The main body cylinder portion, the outer cylinder portion coaxially projecting from the main body cylinder portion in one axial direction, and the outer cylinder portion arranged in the radial direction of the outer cylinder portion and the same as the outer cylinder portion in the main body cylinder portion. An inner cylinder portion coaxially projecting in the direction, a groove portion provided between the main body cylinder portion, the outer cylinder portion, and the inner cylinder portion so as to open in one of the axial directions of the main body cylinder portion. And a joint body having a first screwed portion provided on the outer peripheral portion of the outer tubular portion, and
A tubular fitting portion that can be fitted inside the outer tubular portion of the joint body, and a tubular shape that protrudes from the fitting portion in one axial direction so that it can be press-fitted into one end in the longitudinal direction of the tube. In the direction of the inner cylinder of the joint body and the inner cylinder of the joint body, the press-fitting portion of the joint body, the tubular outer protruding portion projecting from the fitting portion to the other in the axial direction so that the joint body can be press-fitted A tubular inward projecting portion projecting from the fitting portion to the other side in the axial direction so as to be able to come into contact with the inner tubular portion, and the inner tubular portion between the fitting portion and the outer protruding portion when contacting the inner tubular portion. An inner ring having an inner protruding portion arranged inward in the radial direction of the outer protruding portion so as to sandwich the outer ring in the radial direction.
The tubular nut body, the second screwed portion provided on the inner peripheral portion of the nut body so that it can be screwed into the first screwed portion of the joint body, and the second screw with respect to the first screwed portion. It is provided with a union nut having a pressing portion configured to be able to press the tube into which the press-fitting portion of the inner ring is press-fitted with the screwing of the joint portion toward the press-fitting portion.
The inner peripheral portion of the inner tubular portion of the joint body and the inner peripheral portion of the inner protruding portion of the inner ring form a flow path wall of a fluid flow path that communicates with each other by contact between the inner tubular portion and the inner protruding portion. And
The inner peripheral portion of the inner protruding portion of the inner ring
In a state where the inner protrusion is separated from the inner cylinder of the joint body, the inner ring includes a first inner peripheral surface whose inner diameter is reduced from the other in the axial direction toward one in the axial direction.
The inner peripheral portion of the press-fitting portion of the inner ring
In a state where the press-fitting portion is separated from one end in the longitudinal direction of the tube, a second inner peripheral surface whose inner diameter is reduced from one axial direction to the other in the axial direction of the inner ring.
In a state where the second inner peripheral surface is located on the other side in the axial direction and the press-fitting portion is separated from one end in the longitudinal direction of the tube, the inner ring is oriented from one axial direction to the other in the axial direction. Including a third inner peripheral surface having a smaller gradient than the second inner peripheral surface, which has a reduced inner diameter.
When the inner protruding portion of the inner ring is separated from the inner cylinder portion of the joint body and the press-fit portion of the inner ring is separated from one end portion in the longitudinal direction of the tube, the maximum inner diameter of the first inner peripheral surface is obtained. A resin pipe joint characterized in that the maximum inner diameter of the third inner peripheral surface is larger than that of the third inner peripheral surface, and the maximum inner diameter of the second inner peripheral surface is larger than the maximum inner diameter of the third inner peripheral surface.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012163132A (en) * 2011-02-04 2012-08-30 Flowell Corp Tube joint
WO2014181591A1 (en) * 2013-05-08 2014-11-13 日本ピラー工業株式会社 Pipe connecting device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012163132A (en) * 2011-02-04 2012-08-30 Flowell Corp Tube joint
WO2014181591A1 (en) * 2013-05-08 2014-11-13 日本ピラー工業株式会社 Pipe connecting device

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