JP2010261525A - Pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To constitute held parts without forming an unnecessary outer peripheral line at the outer periphery of a pipe joint. <P>SOLUTION: The held parts 33 are formed at the other end B side more than a slide groove 12A on the outer peripheral surface of a first cylinder 12. The held parts 33 are constituted only in a pair in positions circumferentially opposed to each other and in axially different positions from the outer peripheral line 30. The held part 33 includes a flat part 34 and an inclined part 35. The flat part 34 is formed radially inward from the outer periphery of the first cylinder 12 and formed of a flat face with a pair of the flat parts 34 arranged in parallel with each other. The inclined part 35 is formed of an inclined surface axially inclined to be larger in diameter toward the outer peripheral surface of the first cylinder 12 from the axial end 34E of the flat part 34. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a pipe joint for performing a water leak test or the like by connecting to a downstream end portion of a pipe after piping for water supply or hot water supply.

  In recent years, resin pipes are used for piping for water supply and hot water supply. Resin pipes are light and easy to handle, and have the advantage that they do not rust like metal pipes. Moreover, in order to connect the resin pipes, a joint that can be connected with one touch is also used, so that the construction can be easily performed.

  By the way, a hexagonal portion may be formed on the outer periphery of the pipe joint that connects such a resin pipe as a held part in order to enable holding by a tool such as a spanner or a wrench (Patent Document 1). reference). When a hexagonal portion is formed on the outer periphery of the tube, outer peripheral lines are formed in the circumferential direction at both axial ends of the hexagonal portion. When connecting a resin pipe to a pipe joint, it is necessary to insert the pipe into the pipe joint to an appropriate position, so that an outer peripheral line serving as a mark for insertion may be intentionally formed in the pipe joint. However, if the hexagonal portion is configured, an outer peripheral line that may be confused with the outer peripheral line serving as a mark is formed.

JP 2008-25762 A

  The present invention has been made in view of the prior art as described above, and an object of the present invention is to provide a pipe joint that forms a safe held portion without forming an unnecessary outer peripheral line on the outer periphery of the pipe joint. To do.

  The pipe joint according to claim 1 of the present invention is cylindrical and has a cylindrical part into which a pipe is inserted from one end side, and is disposed on the inner periphery of the cylindrical part, and the outer peripheral surface of the pipe and the inner part of the cylindrical part A seal ring that seals between the peripheral surface, an outer peripheral line portion that is formed in a circumferential direction on the outer periphery of the cylindrical portion on the other end side of the seal ring, and a circumferential direction on the outer periphery of the cylindrical portion Only one pair is formed at a position facing each other and at a position different from the outer circumferential line in the axial direction, the flat portion is formed radially inward from the outer periphery of the cylindrical portion, and the cylindrical portion extends from the axial end of the flat portion. A held portion having an inclined portion inclined so as to have a larger diameter toward the outer peripheral surface of the portion.

  In the pipe joint of the present invention, only one pair of flat portions facing each other is formed on the outer periphery of the cylindrical portion. By holding this flat portion with a spanner, the tubular portion can be fastened to the object using the spanner. In the present invention, a hexagonal shape is not used over the entire circumference, but only a pair of flat portions is formed, so that no peripheral line in the circumferential direction is formed. Therefore, the outer peripheral line is not formed unlike the case of the hexagon, and the confusion with the outer peripheral line part for the mark as the insertion allowance formed on the back side (the other end side) in the insertion direction from the seal ring. It can be avoided.

  Further, since the flat portion is formed radially inward from the outer peripheral surface of the cylindrical portion, a corner portion due to a step is formed between the outer peripheral surface and the flat portion. Since the inclined portion having a large diameter from the end portion toward the outer peripheral surface of the cylindrical portion is configured, the corner portion of the step becomes an obtuse angle, and safety at the corner portion can be improved.

  In the pipe joint according to claim 2 of the present invention, a connecting portion is provided on the other end side of the cylindrical portion so that a stop cock that closes the other end side of the cylindrical portion can be attached and detached. It is characterized by.

  According to said structure, a water stop cock can be attached and water can be stopped of piping, and a water pressure test, an airtight test, etc. can be performed.

  The pipe joint according to a third aspect of the present invention is characterized in that an attaching / detaching part capable of attaching / detaching an inserted pipe is formed on the one end side of the cylindrical part.

  According to said structure, a pipe joint and a pipe | tube can be attached or detached, for example, it mounts | wears to perform a water pressure test and an airtight test, can be removed and used after completion | finish.

  The pipe joint according to claim 4 of the present invention is characterized in that an angle between the inclined portion and a radial cross section of the cylindrical portion is 30 degrees to 60 degrees.

  If the angle is less than 30 degrees, the angle of the step becomes sharp, and if the angle exceeds 60 degrees, the cutting area becomes large and wasted. Therefore, by setting the angle within the range of 30 degrees to 60 degrees, the useless space is expanded. Therefore, it is possible to appropriately ensure the safety of the corner portion of the step.

  According to the structure of this invention, a to-be-held part can be comprised, without forming an unnecessary outer periphery line in the outer periphery of a pipe joint.

It is a half cut sectional view of a pipe joint concerning an embodiment of the present invention. It is a half-cut sectional view of the 1st cylinder part in an embodiment of the present invention. It is the partial perspective view which looked at the pipe joint which concerns on embodiment of this invention from the 1st cylinder part side. It is the partial perspective view which looked at the pipe joint which concerns on embodiment of this invention, and the pipe | tube with which the outer periphery line was described from the 1st cylinder part side. It is a partial perspective view which shows the state which hold | maintained the to-be-held part of the pipe joint which concerns on embodiment of this invention with the tool. It is a half cut sectional view showing the state where the pipe was connected to the pipe joint concerning the embodiment of the present invention. It is a half cut sectional view showing the state where a pipe is removed from a pipe joint concerning an embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a half cut sectional view showing a pipe joint 10 according to an embodiment of the present invention. The pipe joint 10 includes a first cylinder part 12, a second cylinder part 14, and a slide cap 16.

  As shown in FIGS. 1 to 3, the first cylindrical portion 12 is cylindrical. A tube 40 is inserted into the first cylinder portion 12 from one end A side in the axial direction. A slide groove 12 </ b> A is formed on the axial end (insertion direction) end A side of the outer periphery of the first cylindrical portion 12. The slide groove 12A is a circumferential groove having a predetermined width in the axial direction. Further, a tapered portion 12T having a larger diameter toward the other end B in the axial direction is formed on the inner peripheral surface on the one end A side of the first tube portion 12. A female screw 12N is formed on the inner periphery of the first cylindrical portion 12 on the other end B side. Between the female screw 12N and the tapered portion 12T, a groove 12M into which a retaining ring 28 described later is fitted is formed.

  The second cylindrical portion 14 is formed in a cylindrical shape, and a male screw 14N that is screwed with the female screw 12N of the first cylindrical portion 12 is formed on one end side. A flange portion 14F is formed on the base end side of the male screw 14N. The flange portion 14F has a larger diameter than the thread of the male screw 14N, and a slightly smaller diameter than the other end B of the first tube portion 12. A female screw 14M is formed on the inner peripheral surface on the other end side of the second cylindrical portion 14. A step portion 14 </ b> D is formed on the inner peripheral surface on one end side of the second cylindrical portion 14. The step portion 14 </ b> D has a diameter that is increased outward in the radial direction, and has a larger diameter than the inner periphery of the second cylindrical portion 14. A ring-shaped cap ring 13 is attached to the outer side in the axial direction of the second cylindrical portion 14 (on the first cylindrical portion 12 side). A concave groove is formed between the cap ring 13 and the stepped portion 14D, and a seal ring 26 described later is fitted therein.

  The second cylindrical portion 14 is engaged with the first cylindrical portion 12 by the male screw 14N being screwed to the male screw 12N until the tip of the other end B of the first cylindrical portion 12 is abutted against the flange portion 14F. It is connected.

  The slide cap 16 has a cylindrical shape, and includes an inner cylinder portion 17 that constitutes an inner wall side of the cylinder and an outer cylinder portion 18 that constitutes an outer wall side of the cylinder, and is engaged between the inner cylinder portion 17 and the outer cylinder portion 18. A joint space 16A is formed. The inner cylinder part 17 and the outer cylinder part 18 are connected by a tip part 19, and one end of the engagement space 16 </ b> A is closed by the tip part 19. One end A side of the first cylinder portion 12 is inserted into the engagement space 16A, and the outer cylinder portion 18 is engaged with the slide groove 12A.

  A side of the inner cylinder portion 17 opposite to the distal end portion 19 extends to the other end side from the outer cylinder portion 18, and a flange portion 17 </ b> F extending radially outward is formed at the distal end. Attachment holes 17H for attaching tube holding claws 22 to be described later are formed at four positions in the circumferential direction on the distal end portion 19 side of the flange portion 17F of the inner cylinder portion 17. The slide cap 16 is movable in the slide groove 12A along the axial direction.

  A tube holding claw 22 is disposed in each of the mounting holes 17H. The tube holding claw 22 has a claw portion 22 </ b> A exposed toward the inside of the slide cap 16. The claw portion 22 </ b> A is a ridge having a tip that can bite into the outer peripheral surface of the tube 40. The tube holding claw 22 is engaged with the mounting hole 17 </ b> H and is movable together with the slide cap 16.

  A coil spring 24 is disposed between the flange portion 17F and the cap ring 13. The slide cap 16 is urged by the coil spring 24 toward the outside in the axial direction (the direction away from the one end A of the first tube portion 12). Accordingly, the tube holding claw 22 is disposed at an intermediate position of the tapered portion 12T of the first cylinder portion 12, and the claw portion 22A protrudes inward from the inner wall of the slide cap 16.

  A seal ring 26 is fitted into the stepped portion 14 </ b> D closed by the cap ring 13. The seal ring 26 seals between the outer peripheral surface of the tube 30 and the inner peripheral surface of the second cylindrical portion 14. A retaining ring 28 is fitted in the groove 12 </ b> M of the first cylinder portion 12. The retaining ring 28 prevents the cap ring 13 from popping out by the coil spring 24 when the second cylindrical portion 14 is removed from the first cylindrical portion 12 for the purpose of replacing the seal ring 26.

  In a state where the first tube portion 12 and the second tube portion 14 are connected, an outer peripheral line 30 is formed at a joint portion between the other end B of the first tube portion 12 and the flange portion 14F of the second tube portion 14. Is done. The outer peripheral line 30 is a line that serves as a mark for the insertion allowance of the tube 40, and is configured closer to the female screw 14 </ b> M side of the second cylindrical portion 14 than the seal ring 26. The length L of the outer peripheral line 30 from the front end surface of the slide cap 16 becomes the insertion allowance for the tube 40. As shown in FIG. 4, the user writes a peripheral line 40L at a position of length L from the insertion tip of the pipe 40, and inserts the pipe 40 into the pipe joint 10 to a position where the peripheral line cannot be seen.

  A held portion 33 is configured on the outer peripheral surface of the first cylindrical portion 12 on the other end B side of the slide groove 12A. As shown in FIG. 2, only one pair of the held portions 33 is configured at positions facing each other in the circumferential direction and different from the outer circumferential line 30 in the axial direction. The held portion 33 includes a flat portion 34 and an inclined portion 35. The flat portion 34 is formed on the inner side in the radial direction from the outer periphery of the first tube portion 12, and is configured by a flat surface on which the pair of flat portions 34 are arranged in parallel to each other. The inclined portion 35 is configured by an inclined surface that is inclined in the axial direction so as to have a larger diameter from the axial end portion 34 </ b> E of the flat portion 34 toward the outer peripheral surface of the first cylindrical portion 12. As shown in FIG. 2, when the angle between the inclined portion 35 and the radial cross section X of the first cylindrical portion 12 is an inclination angle θ, the inclination angle θ is preferably 30 to 60 degrees. .

  As shown in FIG. 5, the flat portions 34 of the pair of held portions 33 are provided as portions for holding with the tool SP (spanner, wrench, etc.) when the first cylinder portion 12 is assembled or removed. Yes. On the extension in the circumferential direction of the pair of held portions 33, no step or cut line is formed.

  As shown in FIG. 1, a water stopcock 42 can be attached to the side opposite to the side into which the pipe 40 of the pipe joint 10 is inserted (the female screw 14M side). The water stopcock 42 includes a male screw portion 42N screwed into the female screw 14M and a flange portion 42F having a diameter larger than that of the male screw portion 42N. A seal ring 43 is disposed on the side of the male screw portion 42N of the flange portion 42F. By screwing the water stopcock 42 to a position where the flange portion 42F is in contact with the tip surface of the second tube portion 14, the other end side opening of the second tube portion 14 of the pipe joint 10 is closed.

  Next, the connection operation of the pipe 40 to the pipe joint 10 and the removal operation will be described.

  When the tube 40 is attached, the tube 40 is inserted from the one end A side of the first cylindrical portion 12 and inserted until the tip of the tube 40 exceeds the seal ring 26 and is positioned in front of the female screw 14M. That is, the above-described insertion substitution peripheral line written on the outer periphery of the tube 40 is inserted to a position hidden by the slide cap 16. As a result, as shown in FIG. 6, the seal ring 26 seals between the outer peripheral surface of the tube 40 and the inner peripheral surface of the second cylindrical portion 14, and the claw portion 22 </ b> A of the tube holding claw 22 is attached to the tube 40. The pipe 40 is connected to the pipe joint 10 by biting. In this state, the water stopper 42 is attached to the other end of the pipe joint 10 to stop the water, and a water pressure test or an airtight test can be performed.

  When removing the tube 40, as shown in FIG. 7, the slide cap 16 is moved toward the first cylindrical portion 12 in the axial direction. As a result, the tube holding claw 22 moves to the other end B side where the tapered portion 12T has a large diameter, retracts radially outward, and the biting of the claw portion 22 into the tube 40 is released. In this state, the pipe 40 can be removed from the pipe joint 10 by pulling out the pipe 40.

  According to the present embodiment, on the extension in the circumferential direction of the pair of held portions 33, since no steps or cut lines are formed, compared to the case where the held portion 33 is configured in a hexagonal shape, It is not possible to form an outer peripheral line that may be confused with the outer peripheral line 30.

  Further, when the held portion is configured on the outer peripheral surface, the stepped portion between the held portion and the outer peripheral surface may become an edge and cause a catch. Since it comprises, it can be set as the structure excellent also in safety.

DESCRIPTION OF SYMBOLS 10 Pipe joint 12 1st cylinder part 14 2nd cylinder part 14N Male screw 22 Pipe holding claw 30 Perimeter line 33 Held part 34E Axial direction end part 34 Flat part 35 Inclined part 40 Pipe

Claims (4)

A cylindrical portion that is cylindrical and into which a tube is inserted from one end side;
A seal ring that is disposed on the inner periphery of the tube portion and seals between the outer peripheral surface of the tube and the inner periphery surface of the tube portion;
An outer peripheral line portion for insertion allowance formed in the circumferential direction on the outer periphery on the other end side than the seal ring of the cylindrical portion;
A flat portion formed at a position opposite to each other in the circumferential direction on the outer periphery of the cylindrical portion and at a position different in the axial direction from the outer peripheral line, and formed on the radially inner side from the outer periphery of the cylindrical portion, A held portion having an inclined portion inclined so as to have a large diameter from an axial end portion of the portion toward the outer peripheral surface of the cylindrical portion,
With pipe fittings.   2. The pipe joint according to claim 1, wherein a connecting portion is provided on the other end side of the cylindrical portion so that a water stop cock that closes the other end side of the cylindrical portion is detachable.   The pipe joint according to claim 1 or 2, wherein an attachment / detachment part to / from which the inserted pipe is attachable / detachable is configured on the one end side of the cylindrical part.   The angle between the said inclination part and the cross section of the radial direction of the said cylinder part is 30 to 60 degree | times, The pipe joint of any one of Claims 1-3 characterized by the above-mentioned.

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