JP6575752B2 - Lock ring for pipe joint and adjustment method of pipe joint - Google Patents

Description

  The present invention relates to a lock ring used for, for example, a water pipe joint and a method for adjusting the pipe joint.

  In the technique of Patent Document 1, a lock ring is provided inside the joint, and the restriction piece of the lock ring bites into the outer peripheral surface of the pipe inserted into the joint, thereby preventing the pipe from coming out.

Japanese Patent No. 2997671

However, in the technique of Patent Document 1, in order to adjust the ease of inserting the pipe into the joint and the difficulty of pulling out the pipe from the joint, it is necessary to change the shape, size, and number of the restriction pieces, or the lock ring It was necessary to change the plate thickness and material.
An object of the present invention is to provide a lock ring for a pipe joint and a method for adjusting the pipe joint that can easily adjust the degree of engagement between the pipe body and the pipe joint.

In order to achieve the above object, a lock ring for a pipe joint according to claim 1 of the present invention is a lock ring for a pipe joint that is built in a pipe joint and used to prevent the pipe body from coming out of the pipe joint. An annular ring body into which the tubular body is inserted, and an inner circumferential edge of the ring body that extends radially inward to prevent the tubular body from being pulled out by engaging with the tubular body. A plurality of lock pieces arranged along the inner peripheral edge of the ring main body and the adjacent lock pieces, and a first end located on the distal end side of the lock piece is opened. In a lock ring for a pipe joint provided with a slit closed at the second end located on the base end side of the lock piece, the second end is circular only for some of the plurality of slits. by forming the hole, the The length from the first end of the slit in which the hole is formed to the second end is determined from the length from the first end to the second end of the slit in which the circular hole is not formed. And the width of the second end where the circular hole is formed is larger than the width of the slit where the circular hole is not formed .

  Further, the pipe joint adjusting method according to the second aspect of the present invention is the pipe joint lock ring according to the first aspect of the present invention, compared with the pipe joint lock ring, and the formation pattern of the circular holes for the plurality of slits. A plurality of lock rings for pipe joints including different lock rings for pipe joints are prepared, and by selecting a lock ring for a pipe joint from these options, the engagement between the pipe joint and the pipe body can be increased. It is characterized by being adjusted.

  In this way, it is possible to prepare a plurality of lock rings for pipe joints with different deformation characteristics of the lock piece by simply making a change in the formation pattern of the circular holes for the plurality of slits. The specific engagement between the pipe joint and the pipe body can be easily adjusted only by appropriately selecting from the prepared pipe joint lock rings.

The longitudinal cross-sectional view of the pipe joint for water supply. The front view of a lock ring. (A)-(c) is a front view which shows the choice of the lock ring at the time of the assembly of the water pipe joint.

An embodiment in which the present invention is embodied in a water pipe joint will be described.
As shown in FIG. 1, the pipe 11 for water supply piping as a tubular body is made of, for example, cross-linked polyethylene or polybutene. An in-core 30 is inserted into the end of the pipe 11 (the end on the left side of the drawing). The joint body 12 is formed in a cylindrical shape, and can be screwed to the water pipe 10 at a male screw portion 13 formed on the outer peripheral surface of the first end portion (the left end portion in the drawing).

An internal thread portion 15 is formed on the inner peripheral surface of the second end portion (the end portion on the right side of the drawing) of the joint body 12. On the inner peripheral surface of the joint body 12, an abutment surface 16 and an inclined surface 17 are formed in the vicinity of the female screw portion 15, and a receiving surface 18 is formed in an annular shape in the vicinity of the male screw portion 13.

A cylindrical retaining member 19 is inserted into the second end of the joint body 12. The retaining member 19 is screwed into the female screw portion 15 of the joint body 12 at a male screw portion 22 formed on the outer peripheral surface of the first end portion (the left end portion in the drawing). The pipe 11 is inserted into the joint body 12 until the position where the in-core 30 contacts the receiving surface 18 through the retaining member 19.

An O-ring 25 is attached to the outer peripheral surface of the retaining member 19 to stop loosening of the retaining member 19 with respect to the joint body 12. In the joint main body 12, a first seal ring 27 and a second seal ring 29 for sealing a gap between the joint main body 12 and the pipe 11 are mounted between the inclined surface 17 and the receiving surface 18. .

  In the joint main body 12, a pair of lock rings 34 and 34 are disposed between the first end portion of the retaining member 19 and the contact surface 16 so as to overlap each other via a spacer 48. The retaining member 19 and the contact surface 16 restrict the spacer 48 and the lock rings 34 and 34 from coming out of the joint body 12. The lock rings 34 and 34 have a function of preventing the pipe 11 inserted through the lock rings 34 and 34 from being pulled out. In order to facilitate understanding of the functional part, the pipe 11 is indicated by a virtual line in FIG.

As shown in FIGS. 1 and 2, the lock rings 34, 34 are obtained by polishing a surface of a molded product obtained by molding stainless steel into a predetermined shape by a press molding method by a barrel processing method, a shot peening method, or a sand blasting method. is there. The lock rings 34, 34 have an annular ring main body 35 and a 45 ° angle with respect to the ring main body 35 radially inward from the inner peripheral edge of the ring main body 35 and toward the first end portion of the joint main body 12. And a plurality of locking pieces 36 extending at an inclination.

An arc-shaped biting portion 36 a is formed at the tip of the lock piece 36. When a strong pulling force is applied to the pipe 11, the lock rings 34 and 34 prevent the pipe 11 from coming out by the biting portion 36 a of the lock piece 36 biting into the outer peripheral surface of the pipe 11. At the base end portion of the lock piece 36, a corner portion 36 b that prevents the lock piece 36 from biting into the pipe 11 by a predetermined amount or more is formed. A slit 40 is formed between the base ends of adjacent lock pieces 36 for all the lock pieces 36. The slit 40 is opened at the first end located on the distal end side of the lock piece 36 and closed at the second end located on the proximal end side of the lock piece 36. The lock piece 36 is given a predetermined elasticity by forming a slit 40 at the base end.

As shown in FIGS. 3A to 3C, there are three types of lock rings 34A to 34C as options for the lock rings 34 and 34 (see FIG. 1) at the time of manufacturing a water pipe joint. Has been prepared. As for each lock ring 34A-34C, the 2nd end part is formed in the circular hole 40a about all or one part among all the slits 40. FIG. A difference between the lock rings 34 </ b> A to 34 </ b> C is a formation pattern of the circular holes 40 a for the plurality of slits 40.

That is, as shown in FIG. 3A, the lock ring 34A includes one slit 40 whose second end is a circular hole 40a, and one slit 40 whose second end is not a circular hole 40a. Has a formation pattern of the circular holes 40a alternately arranged in the circumferential direction. As shown in FIG. 3B, the lock ring 34B has one slit 40 whose second end is not a circular hole 40a and three continuous slits 40 whose second end is a circular hole 40a. And the formation pattern of the circular holes 40a alternately arranged in the circumferential direction. As shown in FIG. 3C, the lock ring 34C has a formation pattern in which the second ends of all the slits 40 are circular holes 40a.

The circular hole 40a of the slit 40 makes the lock piece 36 easily expand outward when the pipe 11 is inserted into the lock rings 34, 34 (34A to 34C). Therefore, the elastic force of the lock piece 36 acting on the pipe 11 is reduced, and the force for inserting the pipe 11 into the lock rings 34 and 34 can be reduced. Further, when the circular hole 40a of the slit 40 reduces the resilience of the lock piece 36 that acts on the pipe 11, when the pipe 11 is pulled out from the lock rings 34, 34 (34A to 34C), the pipe 11 Therefore, the lock piece 36 becomes difficult to follow and the amount of biting of the lock piece 36 into the pipe 11 is reduced.

In the lock piece 36, whether or not the circular hole 40 a is formed in the adjacent slit 40, and whether or not the circular hole 40 a is formed in the slit 40 one and / or several ahead is determined by the lock piece 36. Affects the strength of the elastic force acting on the pipe 11. For example, the more the circular holes 40 a are formed in the nearby slit 40, the weaker the elastic force that the lock piece 36 acts on the pipe 11. That is, if the formation pattern of the circular holes 40a for the plurality of slits 40 is made different, the resilient force that the plurality of lock pieces 36 act on the pipe 11 as a whole, that is, the lock rings 34 and 34 (34A to 34C). The ease of insertion of the pipe 11 and the difficulty of pulling out the pipe 11 from the lock rings 34 and 34 (34A to 34C) can be varied.

  As shown in FIG. 2, the water pipe joint of the present embodiment is assembled by selecting the lock ring 34 </ b> A (see FIG. 3A) for both the pair of lock rings 34 and 34. For example, if it is important to make the pipe 11 easier to insert than the water pipe joint, at least one of the lock rings 34 and 34 (34A) is locked to the lock ring 34B (see FIG. 3B) or the lock. The ring 34C (see FIG. 3C) may be changed, or one lock ring 34 (34A) may be changed to the lock ring 34B, and the other lock ring 34 (34A) may be changed to the lock ring 34C.

  As described above, according to the present embodiment, the plurality of lock rings 34 </ b> A in which the elastic deformation characteristics of the lock pieces 36 are made different simply by changing the formation pattern of the circular holes 40 a for the plurality of slits 40. 34C can be prepared, and the ease of insertion of the pipe 11 into the water pipe fitting or the pipe 11 from the water pipe fitting can be easily selected by appropriately selecting from the prepared lock rings 34A to 34C. The difficulty of slipping out can be easily adjusted.

The present invention may be embodied as follows.
The lock ring 34 has a circular hole 40a at the second end of a plurality of adjacent slits 40 such as two or three, and a second end of the plurality of adjacent slits 40 is circular. Instead of the hole 40a, the former and the latter may be alternately arranged in the circumferential direction.
The lock ring 34 may have no regularity in the formation pattern of the circular holes 40a.
The circular hole 40a may be oval.
The lock piece 36 does not need to bite into the pipe 11 as long as it can provide resistance in the pulling direction to the pipe 11, and is simply pressed against the outer peripheral surface of the pipe 11 to provide sliding resistance. It may be a thing.

DESCRIPTION OF SYMBOLS 11 ... Pipe as a tubular body, 34 ... Lock ring, 34A-34C ... Choice of lock ring, 35 ... Ring main body, 36 ... Lock piece, 40 ... Slit, 40a ... Circular hole.

Claims (2)

A lock ring for a pipe joint that is used in the pipe joint and is used to prevent the pipe body from coming out of the pipe joint,
An annular ring body into which the tube is inserted;
The ring body extends radially inward from the inner periphery of the ring body and engages with the tube body to prevent the tube body from coming out, and a plurality of the tubes are arranged along the inner periphery of the ring body. A locked piece,
A slit formed between adjacent lock pieces, with a first end located on the distal end side of the lock piece open and a second end located on the proximal end side of the lock piece closed In a lock ring for a pipe joint provided with
By forming the second end portion into a circular hole only for a part of the plurality of slits, the length from the first end portion to the second end portion of the slit in which the circular hole is formed. And the width of the second end portion in which the circular hole is formed is set to be larger than the length from the first end portion to the second end portion of the slit in which the circular hole is not formed. A lock ring for a pipe joint, which is larger than the width of the slit in which no hole is formed . A lock ring for a pipe joint according to claim 1;
A plurality of lock rings for pipe joints including a lock ring for pipe joints having different formation patterns of the circular holes with respect to the plurality of slits compared to the lock ring for pipe joints are prepared,
A method for adjusting a pipe joint, wherein the degree of engagement between the pipe joint and the pipe body is adjusted by selecting a lock ring for a pipe joint from the options.

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