JP5520716B2 - Piping connection structure - Google Patents

Description

  The present invention relates to a pipe connection structure for connecting a pipe body and a resin tube by a connector.

  Conventionally, as a pipe connection structure for connecting a pipe body and a resin tube with a connector, for example, those described in Japanese Patent Application Laid-Open No. 2001-141156 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2002-122281 (Patent Document 2) are available. is there. These are applied with connectors that can reduce the number of parts and can be miniaturized.

JP 2001-141156 A JP 2002-122281 A

  An object of this invention is to provide the piping connection structure which can achieve size reduction further.

(First invention)
The pipe connection structure according to the present invention includes a cylindrical pipe body, a tube main body portion formed in a cylindrical shape, and a diameter larger than the inner diameter of the tube main body portion provided integrally with one end opening side of the tube main body portion. A resin tube having a diameter-increased portion formed on the inner diameter and having an inner diameter larger than the outer diameter of the distal end cylindrical portion of the pipe body, and formed in a cylindrical shape, from one end of the cylindrical shape to the inside of the cylinder The pipe body is inserted, the pipe body is locked in a state in which the tip cylindrical portion of the pipe body protrudes from the other end of the cylindrical shape, and the cylindrical outer peripheral surface from the other end of the cylindrical shape is A connector that externally covers the enlarged diameter portion of the resin tube and locks the enlarged diameter portion; and an axially outer side from an end face of the other end of the connector, and an end face of the other end of the connector and the pipe body Of the outer peripheral surface of the resin tube and the enlarged diameter portion of the resin tube An outer peripheral surface of the pipe body and the enlarged diameter are disposed in a space surrounded by a surface, and are radially sandwiched between an outer peripheral surface of the pipe body and an inner peripheral surface of the enlarged diameter portion facing the outer peripheral surface. And a sealing member that seals between the inner peripheral surface of each part.
Of the inner peripheral surface of the connector, the other end side and the outer peripheral surface of the pipe body are arranged in contact with each other or in a state having a gap without interposing the seal member. The end surface of the other end of the connector has a connector-side engagement portion formed in a concave shape, and the end surface of one end of the seal member is formed in a convex shape so as to fit the connector-side engagement portion The sealing member side engaging portion is provided .

According to the present invention, the seal member is outside in the axial direction from the end face of the other end of the connector, and is surrounded by the end face of the other end of the connector, the outer peripheral face of the pipe body, and the inner peripheral face of the enlarged diameter portion of the resin tube. It is arranged in the space. The sealing member is not interposed between the outer peripheral surface of the pipe body and the inner peripheral surface of the connector. Here, in the conventional pipe connection structure, the seal member is disposed between the outer peripheral surface of the pipe body and the inner peripheral surface of the connector, and seals both. On the other hand, according to the present invention, by arranging the seal member as described above, the inner diameter of the connector can be set to be substantially the same as the outer diameter of the pipe body. Therefore, the outer diameter of the connector can be reduced. And since the sealing member is arrange | positioned in the opposing space of the outer peripheral surface of a pipe body, and the internal peripheral surface of the enlarged diameter part of a resin tube, it has sufficient sealing performance. Thus, according to the present invention, it is possible to reliably seal the connection portion between the pipe body and the resin tube while reducing the size in the radial direction at the pipe connection portion.
When the diameter-enlarged portion of the resin tube is sheathed from the other end side of the connector to the outer peripheral surface of the connector, if the seal member is not positioned with respect to the connector, the seal member may be displaced. In some cases, the seal member may not be in contact with the entire inner peripheral surface of the enlarged diameter portion of the resin tube. However, as in the present invention, the seal member can be reliably positioned with respect to the connector by fitting the connector side engagement portion and the seal member side engagement portion. Thereby, when fitting a resin tube, it can prevent that a seal member slips.

  Further, the enlarged diameter portion is formed in a stepped shape at a connection portion with the tube main body portion and has a rear end surface, and the sealing member is provided at the end surface of the other end of the connector and the inner end of the enlarged diameter portion. A seal may be provided between the end face of the other end of the connector and the back end face of the enlarged diameter portion by being sandwiched between the end faces in the axial direction.

  (Second invention)
  A pipe connection structure according to a second aspect of the present invention includes a cylindrical pipe body, a tube main body portion formed in a cylindrical shape, and an inner diameter of the tube main body portion provided integrally with one end opening side of the tube main body portion. A resin tube having an enlarged inner diameter and an enlarged diameter portion formed at an inner diameter larger than the outer diameter of the distal end cylindrical portion of the pipe body, and is formed in a cylindrical shape and is cylindrical from one end of the cylindrical shape. The pipe body is inserted therein, the pipe body is locked in a state in which the tip cylindrical portion of the pipe body protrudes from the other end of the cylindrical shape, and the cylindrical outer peripheral surface from the other end of the cylindrical shape. A connector that covers a part of the opening side of the expanded diameter portion of the resin tube to lock the expanded diameter portion, and is axially outer than the end face of the other end of the connector, The end surface of the other end, the outer peripheral surface of the pipe body, and the resin tube Is disposed in a space surrounded by the inner peripheral surface on the back side of the enlarged diameter portion of the pipe body, and is radially disposed on the outer peripheral surface of the pipe body and the inner peripheral surface on the inner side of the enlarged diameter portion facing the outer peripheral surface. A sealing member that seals between the outer peripheral surface of the pipe body and the inner peripheral surface on the back side of the enlarged diameter portion by being sandwiched.
  On the cylindrical outer peripheral surface of the connector, when a part of the opening side of the enlarged diameter part of the resin tube is sheathed, the part is plastically deformed and also on a part of the opening side of the enlarged diameter part An annular protrusion that is axially locked is formed, and the other end side of the inner peripheral surface of the connector and the outer peripheral surface of the pipe body are in contact with each other or without a gap between the seal members. It is arranged in a state having.
  ADVANTAGE OF THE INVENTION According to this invention, it can seal reliably in the connection part of a pipe body and a resin tube, achieving size reduction of a radial direction in a pipe connection part.

  Further, the enlarged diameter portion is formed in a stepped shape at a connection portion with the tube main body portion and has a rear end surface, and the sealing member is provided at the end surface of the other end of the connector and the inner end of the enlarged diameter portion. A seal may be provided between the end face of the other end of the connector and the back end face of the enlarged diameter portion by being sandwiched between the end faces in the axial direction.

  In addition, a connector-side engagement portion formed in a concave shape or a convex shape is provided on the end surface of the other end of the connector, and the end surface of one end of the seal member is fitted to the connector-side engagement portion. You may make it have a seal member side engaging part formed in convex shape or concave shape.
  Thereby, when fitting a resin tube, it can prevent that a seal member slips.

1st embodiment: It is a figure which shows a pipe connection completion state. 1st embodiment: It is an axial sectional view of the resin tube 40. 1st embodiment: It is a front view of the connector 10. FIG. FIG. 4 is a right side view of FIG. 3. FIG. 4 is a left side view of FIG. 3. FIG. 4 is a rear view of FIG. 3. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is CC sectional drawing of FIG. It is DD sectional drawing of FIG. It is EE sectional drawing of FIG. 1st embodiment: It is an axial sectional view of the seal member 30. 1st embodiment: It is a figure which shows the connection process of piping connection structure, (a) shows a sealing member arrangement | positioning process, (b) shows a resin tube connection process, (c) shows a pipe body insertion process. 2nd embodiment: It is an axial sectional view of the connector 110. 2nd embodiment: It is an axial sectional view of the seal member 130. 2nd embodiment: It is a figure which shows a pipe connection completion state. 3rd embodiment: It is an axial sectional view of the connector 210. FIG. 3rd embodiment: It is a figure which shows a pipe connection completion state.

  Hereinafter, an embodiment in which the pipe connection structure of the present invention is embodied will be described with reference to the drawings.

<First embodiment>
(Overview of piping connection structure)
The outline of the pipe connection structure of the first embodiment will be described with reference to FIG. FIG. 1 is a diagram illustrating a connection completion state in a pipe connection structure in which a pipe body 50 and a resin tube 40 are connected via a connector 10. As shown in FIG. 1, the pipe connection structure includes a tubular pipe body 50, a resin tube 40 having a tube main body portion 41 and an enlarged diameter portion 42, a tubular connector 10, and an annular seal member 30. It is configured with.

  The pipe body 50 is inserted into the inside of the cylinder from one end of the connector 10 (right side in FIG. 1), and the connector 10 has a cylindrical end 51 of the pipe body 50 from the other cylindrical end of the connector 10 (left side in FIG. 1). The pipe body 50 is locked in the protruding state. On the other hand, the enlarged diameter portion 42 of the resin tube 40 is externally attached to the cylindrical outer peripheral surface from the other end of the connector 10 (left side in FIG. 1), and the connector 10 locks the enlarged diameter portion 42.

  At this time, the outer end surface of the connector 10 (on the left side in FIG. 1) from the end surface of the other end of the connector 10 (on the left side in FIG. 1), the outer peripheral surface of the pipe body 50, and the expansion of the resin tube 40. A space 60 surrounded by the inner peripheral surface of the diameter portion 42 is formed. An annular seal member 30 is disposed in the space 60. The seal member 30 is sandwiched in the radial direction between the outer peripheral surface of the pipe body 50 and the inner peripheral surface of the enlarged diameter portion 42 of the resin tube 40 facing the outer peripheral surface of the pipe body 50, whereby the outer peripheral surface of the pipe body 50 and the resin. It seals between the inner peripheral surfaces of the enlarged diameter part 42 of the tube 40. The portion on the other end side of the inner peripheral surface of the connector 10 and the outer peripheral surface of the pipe body 50 are arranged in contact with each other or in a state having a gap without the seal member 30 interposed therebetween.

(Description of each component of the pipe connection structure)
Hereinafter, each component will be described in detail. First, the pipe body 50 will be described with reference to FIG. The pipe body 50 is formed in a cylindrical shape from metal or resin. The pipe body 50 includes a distal end cylindrical portion 51 positioned at the distal end of the pipe body 50 and an annular engagement formed at the proximal end of the distal end cylindrical portion 51 and having an outer diameter Dp2 larger than the outer diameter Dp1 of the distal end cylindrical portion 51. And a stop projection 52.

  Next, the resin tube 40 will be described with reference to FIG. FIG. 2 is a cross-sectional view in the axial direction before the resin tube 40 is mounted on the connector 10. The resin tube 40 has a tube main body portion 41 formed in a cylindrical shape and an inner diameter Dh2 that is integrally provided on one end opening side (the right side in FIG. 2) of the tube main body portion 41 and is larger than the inner diameter Dh1 of the tube main body portion 41. And a large-diameter portion 42 having an inner diameter Dh2 larger than the outer diameter Dp1 of the distal end cylinder portion 51 of the pipe body 50. The diameter-expanded portion 42 of the resin tube 40 is formed in a step shape at a connection portion with the tube main body portion 41 and has a shape having a back end face 42a. The back end surface 42 a is formed in a planar shape orthogonal to the axial direction of the resin tube 40.

  Next, the connector 10 will be described with reference to FIGS. The connector 10 is formed in a cylindrical shape as a whole. The connector 10 is made of resin. The connector 10 is configured by integrally forming a connector main body 11 and a pipe body locking portion 21.

  The connector main body 11 is formed in a cylindrical shape, and the inner peripheral surface of the connector main body 11 is formed in a cylindrical shape that becomes Dc1 in the axial direction. The inner diameter Dc1 of the connector body 11 is the same as or smaller than the outer diameter Dp1 of the distal end cylinder 51 of the pipe body 50 so that the distal end cylinder 51 of the pipe body 50 can be inserted into the tube of the connector body 11. Is also formed slightly larger. The inner peripheral surface of the connector main body 11 exhibits a function as a guide for the distal end tubular portion 51 of the pipe body 50 when the distal end tubular portion 51 of the pipe body 50 is inserted.

  A plurality of annular sharp protrusions 12 are formed on the outer peripheral surface of the connector main body 11 in the axial direction. In the present embodiment, two annular sharp protrusions 12 are illustrated, but one or three or more may be used. It is appropriately changed according to the locking force of the resin tube 40 by the annular sharp protrusion 12.

  And the diameter expansion part 42 of the resin tube 40 is armored by press-fitting on the outer peripheral surface of the connector main body part 11 where the annular sharp protrusion 12 is formed, and the annular sharp protrusion 12 restricts the resin tube 40 from coming off. . Furthermore, the outer edge portion (meaning the radially outer edge portion) of the tube side end surface 13 of the connector main body portion 11 is formed in a planar shape orthogonal to the axial direction of the connector 10. The outer diameter Dc2 of the tube side end surface 13 of the connector main body 11 is formed to be the same as or slightly smaller than the outer diameter Ds2 of the connector side end surface 31 of the seal member 30. Further, the outer diameter Dc2 of the tube side end face 13 of the connector main body 11 is the same as or slightly smaller than the inner diameter Dh2 of the enlarged diameter portion 42 of the resin tube 40 so that the enlarged diameter portion 42 of the resin tube 40 can be inserted. Is formed.

  Further, a groove 14 is formed in the tube side end face 13 of the connector main body 11. In this embodiment, the concave groove 14 is formed in an annular shape over the entire circumference of the tube side end surface 13. The concave groove 14 has a positioning effect of the seal member 30. Although the concave groove 14 may be an intermittent concave portion in the circumferential direction, the annular groove can exhibit a positioning effect more effectively.

  The pipe body locking part 21 is formed in a cylindrical shape as a whole. The pipe body locking portion 21 has an opening cylinder portion 22 into which the distal end cylindrical portion 51 and the annular locking protrusion 52 of the pipe body 50 are inserted, and the axial direction with respect to the annular locking protrusion 52 of the pipe body 50. The pipe body 50 can be locked to the connector 10. The pipe body locking part 21 includes an opening cylinder part 22, a pair of inner locking claw parts 23, 23, a pair of operation claws 24, 24, and a notch groove part 25. The opening cylinder part 22 has an inner diameter into which the annular locking projection 52 of the pipe body 50 can be inserted.

  The pair of inner locking claws 23, 23 are provided on the back side (left side in FIG. 3 and FIG. 8) of the opening cylinder part 22, and project radially inward from the inner peripheral surface of the opening cylinder part 22. Yes. The pair of inner locking claws 23, 23 are formed to be larger than the outer diameter Dp 1 of the tip tube portion 51 of the pipe body 50 and smaller than the outer diameter Dp 2 of the annular locking protrusion 52 of the pipe body 50. ing. Therefore, when the pipe body 50 is inserted from the opening cylinder part 22 of the pipe body locking part 21, the inner locking claw parts 23, 23 pass through the tip cylinder part 51 of the pipe body 50 and then the pipe body 50. Engage with the annular locking projection 52 of the body 50 in the axial direction. Here, the pair of inner locking claw portions 23, 23 are supported by the opening cylinder portion 22 so that the distal end sides thereof can be elastically deformed radially outward with respect to the opening cylinder portion 22. And the inner side surface of a pair of inner side latching claw parts 23 and 23 is formed in the shape which carries out the diameter reduction smoothly toward the back | inner side from the opening cylinder part 22 side. Accordingly, when the annular locking projection 52 of the pipe body 50 is pressed in the axial direction, the distal ends of the pair of inner locking claw portions 23, 23 are elastically deformed radially outward, and the annular locking projection. The part 52 can be passed.

  The pair of operating claws 24, 24 extend outward from the base end portions of the respective inner locking claw portions 23, 23 and are provided integrally with the respective inner locking claw portions 23, 23. ing. The pair of operation stuffs 24, 24 are formed to be parallel. When the pair of operation claws 24 and 24 are operated so as to be close to each other, the distal ends of the pair of inner locking claw portions 23 and 23 are elastically deformed radially outward. That is, by operating the pair of operating claws 24, 24 as described above, the axial locking between the annular locking projection 52 of the pipe body 50 and the pair of inner locking claws 23, 23 is released. As a result, the pipe body 50 can be detached from the connector 10.

  The notch groove 25 is formed on the axially back side (left side in FIGS. 3 and 8) of the pair of inner locking claws 23, 23 and has passed through the pair of inner locking claws 23, 23. The annular locking projection 52 of the pipe body 50 is positioned. When the annular locking projection 52 of the pipe body 50 is positioned in the notch groove 25, the pipe insertion side end face 15 of the connector main body 11 located on the back side of the notch groove 25 (left side in FIGS. 3 and 8). The annular locking projection 52 of the pipe body 50 is engaged in the axial direction. In addition, when the annular locking projection 52 of the pipe body 50 is positioned in the notch groove 25, the pipe body 50 has a pair of inner locking claws 23, 23 positioned on the opening tube portion 22 side of the notch groove 25. The annular locking projection 52 is engaged in the axial direction. That is, the pipe body 50 is positioned with respect to the connector 10 in a state where the annular locking projection 52 of the pipe body 50 is positioned in the notch groove 25.

  The seal member 30 will be described with reference to FIG. The seal member 30 is formed in an annular shape from rubber or resin. The axial cross-sectional shape of the seal member 30 is formed in a shape having a protrusion from one end surface with respect to the rectangular shape. The seal member 30 is formed in a shape having an inner diameter Ds1 and an outer diameter Ds2. The inner diameter Ds1 of the seal member 30 is formed slightly smaller than the outer diameter Dp1 of the distal end cylindrical portion 51 of the pipe body 50 and is slightly smaller than the inner diameter Dc1 of the connector main body portion 11 of the connector 10. Thereby, the inner peripheral surface of the seal member 30 reliably abuts on the outer peripheral surface of the distal end tubular portion 51 of the pipe body 50.

  Further, the outer diameter Ds2 of the seal member 30 is formed to be slightly larger than the inner diameter Dh2 of the enlarged diameter portion 42 of the resin tube 40 and is the same as the outer diameter Dc2 of the tube side end surface 13 of the connector main body 11 of the connector 10 or It is formed slightly larger. Further, the inner edge portion (radial inner edge portion) and the outer edge portion (radial outer edge portion) of the right end surface of FIG. 12 in the seal member 30 are formed in a planar shape orthogonal to the axial direction of the seal member 30. Yes. On the other hand, a curved chamfer is formed on the outer edge portion of the left end surface of FIG. This is to facilitate insertion of the enlarged diameter portion 42 of the resin tube 40.

  And the protrusion 32 which protrudes toward an axial direction is formed in the radial direction center part among the right end surfaces of the sealing member 30 of FIG. The protrusion 32 is formed in an annular shape over the entire circumferential direction. The radial width of the protrusion 32 is formed at the same position and the same diameter as the radial width of the concave groove 14 of the connector main body 11 so that the protrusion 32 can be fitted into the concave groove 14 of the connector main body 11. . In addition, when the concave groove 14 is intermittently formed in the circumferential direction, the protrusion 32 is intermittently formed at a phase corresponding to the concave groove 14.

(Piping connection process)
Next, the pipe connection process of each of the constituent members 10, 30, 40, 50 described above will be described with reference to FIGS. 13 (a), 13 (b), and 13 (c). First, as shown in FIG. 13A, the seal member 30 is coaxially disposed on the tube side end surface 13 of the connector main body 11 of the connector 10. At this time, the seal member 30 is positioned with respect to the connector 10 such that the protrusion 32 of the seal member 30 is fitted into the concave groove 14 of the connector body 11. By fitting the annular protrusion 32 into the annular concave groove 14, the seal member 30 is positioned so as not to be displaced in the radial direction with respect to the connector 10.

  Subsequently, with respect to the connector 10 in which the seal member 30 in the state of FIG. 13A is disposed, the diameter-expanded portion of the resin tube 40 from the side on which the seal member 30 is disposed, that is, from the left side in FIG. 42 is put on the exterior. At this time, since the inner diameter Dh2 of the enlarged diameter portion 42 of the resin tube 40 is smaller than the outer diameter Ds2 of the seal member 30, the inner peripheral surface of the enlarged diameter portion 42 of the resin tube 40 contacts the outer peripheral surface of the seal member 30. However, the resin tube 40 is sheathed on the outer peripheral surface of the seal member 30. At this time, since the protrusion 32 of the seal member 30 is fitted in the concave groove 14 of the connector main body 11, the seal member 30 is attached when the enlarged diameter portion 42 of the resin tube 40 is attached to the outer peripheral surface of the seal member 30. Can prevent misalignment. Therefore, the seal member 30 can maintain the state shown in FIG.

  Further, the inner diameter Dh <b> 2 of the enlarged diameter portion 42 of the resin tube 40 is formed smaller than the outer diameter of the annular sharp protrusion 12 of the connector main body portion 11. Accordingly, the enlarged diameter portion 42 of the resin tube 40 passes through the annular sharp protrusion 12 while being plastically deformed. As a result, the annular sharp protrusion 12 of the connector main body 11 exerts an axially locking force with respect to the enlarged diameter portion 42 of the resin tube 40, and the resin tube 40 is locked to the connector 10 in the axial direction. . At this time, the rear end surface 42 a of the enlarged diameter portion 42 of the resin tube 40 is in contact with the end surface of the seal member 30. That is, the seal member 30 is disposed so as to be sandwiched in the axial direction between the tube-side end surface 13 of the connector main body 11 and the back end surface 42 a of the enlarged diameter portion 42 of the resin tube 40.

  Subsequently, as shown in FIG. 13C, the pipe body 50 is inserted into the state of FIG. 13B from the side of the opening cylinder portion 22 of the pipe body locking portion 21 of the connector 10. When the pipe body 50 is inserted into the cylinder of the connector 10, the annular locking protrusions 52 of the pipe body 50 are engaged with the pair of inward locking claw portions 23, 23 of the connector 10 in the axial direction. Further, by inserting the pipe body 50 on the left side of FIG. 13C, the distal ends of the pair of inner locking claw portions 23, 23 are elastically deformed radially outward, and the annular locking of the pipe body 50 is performed. The protrusion 52 can be passed. And the pipe body 50 advances to the position shown in FIG.13 (c). Here, the distal end cylinder portion 51 of the pipe body 50 advances while being guided by the inner peripheral surface of the connector main body portion 11.

  Then, the annular locking projection 52 of the pipe body 50 is against the pipe insertion side end face 15 of the connector main body 11 of the connector 10 and the pair of inner locking claws 23, 23 of the pipe body locking part 21. Are locked in both axial directions and positioned with respect to the connector 10. In this state, the distal end side of the distal end cylindrical portion 51 of the pipe body 50 is in a state of protruding outward in the axial direction from the tube side end surface 13 of the connector main body portion 11. That is, the distal end side of the distal end tubular portion 51 of the pipe body 50 proceeds to the axial position where the seal member 30 is disposed, and comes into contact with the inner peripheral surface of the seal member 30.

  That is, the seal member 30 is on the axially outer side (the left side in FIG. 13A) from the tube side end surface 13 of the connector main body 11 of the connector 10, and the tube side end surface 13 of the connector main body 11 and the pipe body 50. Are disposed in a space 60 surrounded by the outer peripheral surface of the resin tube 40, the inner peripheral surface of the enlarged diameter portion 42 of the resin tube 40, and the inner end surface 42 a of the enlarged diameter portion 42 of the resin tube 40. The seal member 30 is sandwiched radially between the outer peripheral surface of the pipe body 50 and the inner peripheral surface of the enlarged diameter portion 42 of the resin tube 40 facing the outer peripheral surface of the pipe body 50, thereby Sealing is performed between the surface and the inner peripheral surface of the enlarged diameter portion 42 of the resin tube 40. Further, the seal member 30 is sandwiched in the axial direction by the tube side end surface 13 of the connector main body 11 and the back end surface 42a of the diameter enlarged portion 42 of the resin tube 40, whereby the tube side end surface 13 of the connector main body 11 and the resin Sealing is performed between the tube 40 and the rear end surface 42a of the enlarged diameter portion 42. Therefore, reliable sealing performance is exhibited.

  In particular, since the protrusion 32 of the seal member 30 fits into the concave groove 14 of the connector body 11, the seal member 30 can be prevented from being displaced with respect to the connector 10 when the resin tube 40 is sheathed. It is possible to prevent a decrease in sealing performance due to the displacement of the member 30. That is, reliable sealing performance can be exhibited.

  According to the pipe connection structure described above, the seal member 30 is disposed in the space 60, and the inner peripheral surface of the connector main body 11 of the connector 10 and the outer peripheral surface of the pipe body 50 interpose the seal member 30. It is located without. Specifically, with respect to the latter, the inner peripheral surface of the connector main body 11 of the connector 10 and the outer peripheral surface of the pipe body 50 are arranged in contact with each other or in a state having a gap without the seal member 30 interposed therebetween. ing.

  Thereby, the inner diameter Dc1 of the connector main body 11 of the connector 10 can be set to be substantially the same as the outer diameter Dp1 of the distal end tubular portion 51 of the pipe body 50. Therefore, the outer diameter of the connector 10 can be reduced. Therefore, according to the present embodiment, it is possible to reliably seal the connection portion between the pipe body 50 and the resin tube 40 while reducing the size in the radial direction at the pipe connection portion.

  Furthermore, according to the present embodiment, the outer edge of the tube-side end surface 13 of the connector main body 11 of the connector 10 and the outer edge of the end surface of the seal member 30 facing the connector main body 11 are in the axial direction of the connector 10. The outer diameter Dc2 of the tube-side end face 13 of the connector main body 11 of the connector 10 is set to be equal to or smaller than the outer diameter Ds2 of the end face of the seal member 30. The outer edge of the tube-side end surface 13 of the connector main body 11 and the outer edge of the end surface of the seal member 30 are in contact with each other. Thus, when the enlarged diameter portion 42 of the resin tube 40 is fitted to the outer peripheral side of the connector main body 11 of the connector 10, the outer edge portion of the end surface of the seal member 30 is the outer edge portion of the tube side end surface 13 of the connector main body portion 11. Therefore, the seal member 30 can be reliably prevented from being caught between the outer peripheral surface of the connector main body portion and the inner peripheral surface of the enlarged diameter portion 42 of the resin tube 40. In addition, although the outer edge part of the sealing member 30 has the part which is not contact | abutting to the tube side end surface 13 of the connector main-body part 11, there is little influence, since it is slight.

<Modification of First Embodiment>
In the first embodiment, the protrusion 32 is formed on the seal member 30 and the concave groove 14 is formed on the tube side end surface 13 of the connector main body 11. That is, a concave groove may be formed in the seal member 30 and a protrusion may be formed on the tube side end surface 13 of the connector main body 11. In this case, the same effect as described above can be obtained. However, from the viewpoint of molding, when a rubber material is used as the material of the seal member 30, it is not easy to form a minute groove of the rubber material compared to the case of forming a groove in the resin. . Therefore, it is easier to form the concave groove in the connector 10.

  Moreover, in 1st embodiment, although the back end surface 42a of the enlarged diameter part 42 of the resin tube 40 shall be contact | abutted to the sealing member 30, it is not restricted to this. That is, the seal member 30 may be disposed at a position separated from the back end surface 42 a of the diameter-expanded portion 42 of the resin tube 40. However, as described in the first embodiment, by bringing the seal member 30 into contact with the back end surface 42a of the enlarged diameter portion 42 of the resin tube 40, the sealing performance can be further improved, and the seal member 30 It also has an axial positioning effect.

<Second embodiment>
The pipe connection structure of the second embodiment will be described with reference to FIGS. The same components as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted. As shown in FIG. 14, the shape of the tube side end surface 113 of the connector main body 111 of the connector 110 in the second embodiment and the end on the tube side end surface 13 side of the outer peripheral surface are different from those of the first embodiment. That is, the tube side end surface 113 has a shape in which the taper of the annular sharp protrusion 12 is extended. And the outer diameter of the tube side end surface 113 is made smaller than the outer diameter of the sealing member 130 compared with 1st embodiment.

  Further, as shown in FIG. 15, in the second embodiment, another annular protrusion 132 is formed on the outer edge portion of the end surface of the seal member 130 that forms the protrusion 32. The inner peripheral surface of the protrusion 132 is formed in a taper shape whose diameter increases toward the tip side. Specifically, the inner peripheral surface of the protrusion 132 is formed in a shape corresponding to the tapered shape of the end portion on the tube side end surface 113 side of the outer peripheral surface of the connector main body 111 of the connector 110.

  With such a shape, as shown in FIG. 16, when the seal member 130 is brought into contact with the tube side end surface 113 of the connector main body 111, the protrusion 132 of the seal member 130 is the outer peripheral surface of the connector main body 111. It will be in the state contact | abutted to the taper surface of the edge part. That is, the protrusions 32 and 132 of the seal member 130 are engaged with the connector main body 111 in the radial direction. Thereby, the sealing member 130 exhibits a positioning effect in the radial direction with respect to the connector main body 111 more. Therefore, when the resin tube 40 is mounted on the seal member 130 and the connector main body 111, it is possible to prevent the position of the seal member 130 from being displaced with respect to the connector main body 111.

<Third embodiment>
The pipe connection structure of the third embodiment will be described with reference to FIGS. The same components as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted. As shown in FIG. 17, the connector 210 in the third embodiment has a shape that does not form the concave groove 14 of the first embodiment. Further, as shown in FIG. 18, the seal member 230 has a circular shape and is deformed into an elliptical shape by elastic deformation. In this case, the same effect as that of the first embodiment is achieved with regard to downsizing.

10: Connector, 11: Connector main body, 12: Circular sharp projection 13: Tube side end surface, 14: Concave groove, 15: Pipe insertion side end surface 21: Pipe body locking part, 22: Opening cylinder part, 23: Inward Locking claw part 24: Operation claw 25: Notch groove part 30: Seal member 31: Connector side end face 32: Protrusion 40: Resin tube 41: Tube body part 42: Expanded diameter part 42a: Back end face 50: Pipe body 51: End cylindrical portion 52: Annular locking projection 60: Space 110: Connector 111: Connector main body 113: End side surface 130: Seal member 132: Projection 210: Connector 230: Seal Element

Claims (5)

A tubular pipe body,
A tube main body formed in a cylindrical shape, and an outer diameter of the end tube portion of the pipe body which is integrally provided on one end opening side of the tube main body and has an inner diameter larger than the inner diameter of the tube main body. A resin tube having an enlarged diameter portion formed to have a larger inner diameter,
It is formed in a cylindrical shape, the pipe body is inserted into the inside of the cylinder from one end of the cylindrical shape, and the pipe body is locked in a state where the distal end cylindrical portion of the pipe body protrudes from the other end of the cylindrical shape, A connector that externally attaches the enlarged diameter portion of the resin tube to the cylindrical outer peripheral surface from the other end of the cylindrical shape, and locks the enlarged diameter portion;
In a space that is axially outer than the end face of the other end of the connector and is surrounded by the end face of the other end of the connector, the outer peripheral face of the pipe body, and the inner peripheral face of the enlarged diameter portion of the resin tube. Arranged between the outer peripheral surface of the pipe body and the inner peripheral surface of the enlarged diameter portion by being radially sandwiched between the outer peripheral surface of the pipe body and the inner peripheral surface of the enlarged diameter portion facing the outer peripheral surface. A sealing member that seals in between;
With
Of the inner peripheral surface of the connector, the other end side and the outer peripheral surface of the pipe body are arranged in a contact state or in a state having a gap without interposing the seal member ,
On the end face of the other end of the connector, there is a connector-side engagement portion formed in a concave shape,
The pipe connection structure according to claim 1, further comprising: a seal member side engaging portion formed in a convex shape so as to be fitted to the connector side engaging portion on an end face of one end of the seal member . In claim 1 ,
The diameter-expanded portion is formed in a stepped shape at a connection site with the tube main body portion and has a back end surface,
The seal member is sandwiched in the axial direction between the end surface of the other end of the connector and the back end surface of the enlarged diameter portion, so that the end surface of the other end of the connector and the back end surface of the enlarged diameter portion are Piping connection structure that seals in between . A tubular pipe body,
A tube main body formed in a cylindrical shape, and an outer diameter of the end tube portion of the pipe body which is integrally provided on one end opening side of the tube main body and has an inner diameter larger than the inner diameter of the tube main body. A resin tube having an enlarged diameter portion formed to have a larger inner diameter,
It is formed in a cylindrical shape, the pipe body is inserted into the inside of the cylinder from one end of the cylindrical shape, and the pipe body is locked in a state where the distal end cylindrical portion of the pipe body protrudes from the other end of the cylindrical shape, A connector that externally covers a part of the opening side of the enlarged diameter portion of the resin tube from the other end of the cylindrical shape to the cylindrical outer peripheral surface, and locks the enlarged diameter portion;
It is axially outside from the end face of the other end of the connector, and is surrounded by the end face of the other end of the connector, the outer peripheral face of the pipe body, and the inner peripheral face of the inner side of the enlarged diameter portion of the resin tube. The outer peripheral surface of the pipe body and the enlarged diameter portion are arranged in a space and are radially sandwiched between the outer peripheral surface of the pipe body and the inner peripheral surface on the back side of the enlarged diameter portion facing the outer peripheral surface. A sealing member for sealing between the inner peripheral surface on the back side of
With
On the cylindrical outer peripheral surface of the connector, when a part of the opening side of the enlarged diameter part of the resin tube is sheathed, the part is plastically deformed and also on a part of the opening side of the enlarged diameter part An annular projection that is axially locked is formed,
The piping characterized in that the other end side of the inner peripheral surface of the connector and the outer peripheral surface of the pipe body are arranged in contact with each other or in a state having a gap without interposing the seal member. Connection structure.   In claim 3,
  The diameter-expanded portion is formed in a stepped shape at a connection site with the tube main body portion and has a back end surface,
  The seal member is sandwiched in the axial direction between the end surface of the other end of the connector and the back end surface of the enlarged diameter portion, so that the end surface of the other end of the connector and the back end surface of the enlarged diameter portion are Piping connection structure that seals in between. In claim 3 or 4 ,
On the end face of the other end of the connector, there is a connector side engaging portion formed in a concave shape or a convex shape,
The pipe connection structure which has the sealing member side engaging part formed in the convex shape or the concave shape in the end surface of the end of the said sealing member so that it might fit in the said connector side engaging part.

Images