JP2013148163A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint, in which a liquid pool is not produced while maintaining sealability and rotation performance between pipes.SOLUTION: An L-shaped tube 11 to be connected to a fastening member 12 is inserted in the nut-shaped fastening member 12. An adapter 13 is fitted to and inserted in the fastening member 12, and the L-shaped tube 11 is held between the adapter 13 and the fastening member 12 in a turnable and locking manner. A tapered surface 13D is formed on a fore end outer circumferential edge of a sleeve part 13A of the adapter 13 to be fitted to and inserted in an end part 11B of the L-shaped tube 11. A triangular groove is formed of the tapered surface 13D, a boundary surface 11D of the L-shaped tube 11, and an inner circumferential surface of the end part 11B, and an O-ring is arranged in the triangular groove and compressed therein. The G dimension of the triangular groove is set to be 0.9 to 1.1 W with respect to an O-ring wire diameter W.

Description

  The present invention relates to a pipe joint that connects pipes rotatably.

  A pipe joint is known in which, for example, one end of an L-shaped pipe is rotatably fitted between a nut-shaped fastening member and an adapter fitted inside the nut-shaped fastening member (see Patent Document 1). . In the pipe joint of Patent Document 1, an O-ring is inserted between the cylindrical inner peripheral surface of the L-shaped tube and the cylindrical outer peripheral surface of the adapter in order to maintain airtightness and maintain the rotation of the pipe.

Japanese Patent No. 3932509

  However, in the configuration of Patent Document 1, a section where the cylindrical inner peripheral surface of the L-shaped tube and the cylindrical outer peripheral surface of the adapter are in sliding contact is formed on both sides of the O-ring. It becomes a puddle. When handling beverages, foods, pharmaceuticals, etc., the occurrence of liquid pools is particularly problematic.

  It is an object of the present invention to provide a pipe joint that does not generate a liquid pool while maintaining sealing performance and rotational performance between pipes.

  The pipe joint of the present invention includes a fastening member, a pipe connected to the fastening member, an adapter that is disposed in the fastening member and holds the pipe in a rotatable and retaining state between the fastening member, and the adapter and the pipe. A pipe joint including an O-ring interposed therebetween, wherein a tapered surface is formed at the outer peripheral edge of the tip of the sleeve portion of the adapter inserted into the pipe, and a triangular groove is formed between the tapered surface and the inner surface of the pipe. The O-ring is disposed in the triangular groove, and the G dimension of the triangular groove is 0.9 W to 1.1 W with respect to the O-ring wire diameter W.

  In order to further reduce the occurrence of liquid accumulation, the gap between the tip of the sleeve portion and the inner surface of the tube is preferably 0.27 W to 0.47 W, and further from the inner peripheral surface of the sleeve portion to a tapered surface. It is preferable to set the distance to 0.27 W to 0.40 W. Further, a second O-ring may be interposed between the outer peripheral surface of the sleeve portion and the inner peripheral surface of the pipe in order to prevent foreign matter from entering from the outside.

  ADVANTAGE OF THE INVENTION According to this invention, the pipe joint which does not generate | occur | produce a liquid pool can be provided, maintaining the sealing performance between pipes and rotation.

It is a fragmentary sectional view of the pipe joint of this embodiment. It is an expanded sectional view of an O-ring mounting part.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partial cross-sectional view showing a configuration of a pipe joint according to an embodiment of the present invention.

  FIG. 1 shows a half along the axis of the pipe joint 10 of this embodiment as a cross-sectional view and the rest as a side view. The pipe joint 10 is a pipe joint used for, for example, a liquid pipe, and mainly includes a pipe 11, a fastening member 12, an adapter 13, and an O-ring 14.

  In the present embodiment, the tube 11 is an L-shaped tube having an L-shape, for example, and one end of the L-shaped tube 11 is rotatably connected to a fastening member 12 as described later. On the other hand, for example, a push-in joint 15 is provided at the other end of the L-shaped tube 11 and a flexible tube (not shown) is connected thereto.

  Further, in the present embodiment, the fastening member 12 is a nut-like fastening part that is used, for example, by hand turning, and is provided with knob-like projections 12A that are non-slip at regular intervals along the circumference. A female screw 12B is threaded on the inside of the fastening member 12, and is usually screwed to a fixed part of a device or a fixed pipe.

  In the fastening member 12, an adapter 13 is mounted for rotatably engaging the L-shaped tube 11 with the fastening member 12. The adapter 13 has a sleeve shape with a flange, the sleeve portion 13A is fitted into the L-shaped tube 11, and the flange portion 13B is brought into contact with the locking surface 12C in the fastening member 12 to restrict its axial movement. Is done.

  That is, the fastening member 12 is provided with a fastening portion 12D in which a female screw 12B is formed, and a connecting portion 12E that has an inner diameter smaller than the inner diameter of the female screw 12B and is used for connecting the L-shaped tube 11, and the fastening portion 12D. A step portion perpendicular to the cylindrical axis is formed as a locking surface 12C between the inner peripheral surface of the connecting portion and the inner peripheral surface of the connecting portion 12E. In a state where the L-shaped tube 11 is fitted and inserted into the fastening member 12 from the opening on the connection portion 12E side, the adapter 13 is inserted into the fastening member 12 from the opening on the fastening portion 12D side, and the sleeve portion 13A is inserted into the L-shaped tube 11. It is inserted inside.

  The outer diameter of the flange portion 13B is formed larger than the inner diameter of the connection portion 12E, and the flange portion 13B and the locking surface 12C come into contact with each other, so that the L-shaped tube 11 is prevented from being detached from the connection portion 12E. Further, when the fastening member 12 is screwed to the fixing portion (not shown), the flange portion 13B is interposed between the front end (not shown) of the male screw of the fixing portion and the locking surface 12C via a packing or the like. The movement is restricted in both the axial direction and the rotational direction, and the fastening member 12 and the adapter 13 are integrally fixed to the fixing portion.

  Further, the sleeve 13A of the adapter 13 and the L-shaped tube 11 are engaged with each other by connecting an annular protrusion 13C formed on the outer periphery of the sleeve 13A with an annular groove 11A formed on the inner peripheral surface of the L-shaped tube 11. As a result, the L-shaped tube 11 is rotatable in the circumferential direction while the movement in the axial direction is restricted with respect to the adapter 13. The adapter 13 is formed of an elastic material such as resin, and when the sleeve portion 13A is inserted into the L-shaped tube 11, the sleeve portion 13A is radially inward until the projection 13C is fitted in the groove 11A. Compressed.

  More specifically, the end 11B on the connection side of the L-shaped tube 11 has a larger outer diameter and inner diameter than the tube main body 11C, and the axial length of the sleeve portion 13A of the adapter 13 and the L-shaped tube 11 The lengths of the end portions 11B in the axial direction are substantially the same. That is, a boundary surface 11D perpendicular to the axial direction is formed at the boundary between the inner peripheral surface of the tube main body 11C and the inner peripheral surface of the end portion 11B, and the protrusion 13C of the adapter 13 and the groove 11A provided in the end portion 11B are formed. When fitted, the flange portion 13B is adjacent to the distal end surface of the end portion 11B with a slight gap, and the distal end of the sleeve portion 13A is adjacent to the boundary surface 11D with a predetermined gap described later. Further, the inner diameter of the tube main body 11C and the inner diameter of the sleeve portion 13A are formed to be substantially equal, and the occurrence of pressure loss of the circulating fluid is prevented.

  Further, in the present embodiment, a tapered surface 13D is provided on the outer peripheral edge of the distal end portion of the sleeve portion 13A. An O-ring 14 is disposed on the tapered surface 13D. During assembly, the O-ring 14 is compressed between the tapered surface 13D, the boundary surface 11D, and the inner peripheral surface of the end portion 11B. Airtight between the gaps.

  In the present embodiment, an O-ring 16 is inserted between the outer peripheral surface of the sleeve portion 13A and the end portion 11B in order to more reliably prevent foreign matter from entering from the outside. In the example of FIG. 1, an annular groove is provided on the outer peripheral surface of the sleeve 13 </ b> A, and an O-ring 16 is installed here. Corresponding to the annular groove formed on the outer peripheral surface of the sleeve 13A, a step portion is formed on the inner peripheral surface of the end portion 11B of the L-shaped tube 11, and the O-ring 16 is provided between the annular groove and the step portion. It is compressed with. In the present embodiment, the outer diameter of the end portion 11B of the L-shaped tube 11 is formed substantially equal to the inner diameter of the connection portion 12E of the fastening member 12 except for tolerance.

  Next, with reference to FIG. 2, the seal structure using the tapered surface 13D and the O-ring 14 of this embodiment will be described in more detail. FIG. 2 is an enlarged step view of a triangular groove formed by the O-ring 14, the tapered surface 13 </ b> D surrounding the O-ring 14, the boundary surface 11 </ b> D, and the inner peripheral surface 11 </ b> E of the end portion 11 </ b> B. The size of the O-ring is shown as a state before compression, and a part thereof is drawn with a broken line.

  The tapered surface 13D of this embodiment is provided at an angle of 45 ° with respect to the cylindrical axis direction, and the G dimension of the triangular groove (the length of the two sides facing the tapered surface) is 0 with respect to the O-ring wire diameter W. .9 W to 1.1 W, and the gap t between the tip of the sleeve portion 13 </ b> A and the boundary surface 11 </ b> D is 0.27 W to 0.47 W. Furthermore, the distance T from the inner peripheral surface of the sleeve portion 13A to the tapered surface 13D is 0.27W to 0.40W.

  By configuring as described above, the compressed O-ring fills the substantially triangular groove, the occurrence of liquid pool is prevented, and the axial force applied to the O-ring is reduced, so that the space between the adapter and the L-shaped tube is reduced. Rotational motion is not hindered.

  In place of the tapered surface 13D, the outer peripheral edge of the sleeve portion 13A is cut off into a square shape, that is, the outer peripheral corner portion of the tip portion is cut off in a plane parallel to the boundary surface 11D and the inner peripheral surface 11E of the end portion 11B. Good.

  In this embodiment, a method using a screw for the fastening member 12 is adopted, but another joining method may be adopted. In the present embodiment, an L-shaped tube has been described as an example. However, the tube body may not be bent, and the bending angle is not limited to the present embodiment. Moreover, although the push-in joint (15) was attached to the pipe | tube, it is not limited to this.

DESCRIPTION OF SYMBOLS 10 Pipe joint 11 L-shaped pipe 11A Toroidal groove 11B Connection side end part 11C Pipe body 11D Interface 11E End part inner peripheral surface 12 Fastening member 13 Adapter 13A Sleeve part 13B Flange part 13C Annular protrusion 13D Tapered surface 14 O-ring 15 Push Inn joint 16 O-ring

Claims (4)

A fastening member, a tube connected to the fastening member, an adapter disposed in the fastening member and rotatably held between the fastening member and the adapter and the tube A pipe joint provided with an O-ring inserted in
A taper surface is formed on the outer periphery of the tip of the sleeve portion of the adapter to be inserted into the tube, a triangular groove is formed between the taper surface and the inner surface of the tube, and the O-ring is formed in the triangular groove. And the G dimension of the triangular groove is 0.9 W to 1.1 W with respect to the O-ring wire diameter W of the O-ring.   The pipe joint according to claim 1, wherein a gap between a tip of the sleeve portion and an inner side surface of the pipe is 0.27W to 0.47W.   The pipe joint according to claim 2, wherein a distance from an inner peripheral surface of the sleeve portion to the tapered surface is 0.27W to 0.40W.   The pipe joint according to claim 3, wherein a second O-ring is interposed between the outer peripheral surface of the sleeve portion and the inner peripheral surface of the pipe.

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