JP6624435B2 - Piping fittings - Google Patents

Description

  The present invention relates to a pipe joint used for water supply, for example.

  In Patent Literature 1, after a joint body and a resin short tube are snap-engaged, an incore is press-fitted into the resin short tube to reinforce a contact portion of the resin short tube with a seal ring from the inside. It is disclosed that the sealability is improved while ensuring the ease of assembly.

Japanese Patent No. 4939826

However, the technique of Patent Literature 1 is a relatively small part because it is an assembly procedure in which the resin short pipe and the joint body are snap-engaged before the in-core is press-fitted into the resin short pipe. The incore exists alone until the final stage of the assembly process, and there is a problem that the incore is easily lost.

  An object of the present invention is to provide a piping joint that can easily adopt an assembly procedure of inserting an incore into a second flow path member before snap-engaging the first flow path member and the second flow path member. It is in.

In order to achieve the above object, the invention according to claim 1 includes a first flow path member having an outer cylindrical part, a second flow path member having a resin inner cylindrical part, an outer peripheral surface of the inner cylindrical part and the outer flow path. A pipe joint including a seal ring for sealing between an inner peripheral surface of a cylindrical portion and an incore separate from the first flow path member , wherein the inner cylindrical portion is inserted into the outer cylindrical portion. The engaging portion formed on the outer peripheral surface of the inner cylindrical portion utilizes the elasticity provided by the inner cylindrical portion being made of resin, and the engaged portion formed on the inner peripheral surface of the outer cylindrical portion is used. While being snap-engaged with the portion, the incore is inserted and disposed inside the inner cylindrical portion, and before the first channel member and the second channel member snap-engage, the incore is in piping fittings to complete the insertion arrangement to the inner cylindrical portion, the incore the inner peripheral surface of the inner cylinder part to , Including the area corresponding to the inside of the seal ring and not including the area corresponding to the inside of the engagement portion, is in contact with the position, the incore, the inner peripheral surface of the inner cylindrical portion, It does not reach a region corresponding to the inside of the engaging portion.

  ADVANTAGE OF THE INVENTION According to this invention, since the incore does not contact the area | region corresponding to the inside of an engagement part in the inner peripheral surface of an inner cylinder part, it suppresses that the elastic deformation of the said engagement part is obstructed by an incore. it can. Therefore, it is easy to adopt an assembly procedure of inserting the incore into the second flow path member before the first flow path member and the second flow path member are snap-engaged.

FIG. 3 is a partial cross-sectional view of a pipe joint. FIG. 7 is a partial cross-sectional view of the second flow path member and the in-core, illustrating a method of assembling. FIG. 4 is a partial cross-sectional view of a pipe joint and illustrates an assembling method.

Hereinafter, an embodiment in which the present invention is embodied in a pipe joint used for water supply will be described with reference to FIGS.
As shown in FIG. 1, the pipe joint according to the present embodiment includes a first flow path member 11 made of metal or synthetic resin and having a cylindrical shape, and a second flow path member made of synthetic resin and having a cylindrical shape. A member 12, a rubber seal ring 13, and a cylindrical incore 14 made of metal or synthetic resin are provided.

  The first flow path member 11 has a male screw part 11a on an outer peripheral surface of a first end (left end in FIG. 1) and an outer cylinder on a second end (right end in FIG. 1). The portion 15 has a hexagonal portion 11 b formed on the outer peripheral surface of the outer cylindrical portion 15. The male screw portion 11a is a portion for connecting the piping joint to a device or the like, and the hexagonal portion 11b is a portion for hooking a tool when connecting to the device or the like.

  On the inner peripheral surface of the first flow path member 11, a step 15a is formed between the first end and the second end, the step 15a having a large diameter on the second end side (the outer cylinder 15 side). I have. An annular seal accommodation groove 15b is formed near the step 15a on the inner peripheral surface of the outer cylindrical portion 15. The seal ring 13 is housed in the seal housing groove 15b.

On the inner peripheral surface of the outer cylindrical portion 15, an annular engaging recess 16 as an engaged portion is formed between the opening 15c of the outer cylindrical portion 15 and the seal accommodating groove 15b. In the engagement recess 16, the inner wall surface on the opening 15c side forms a vertical surface 16a with respect to the pipe axis L, and the inner wall surface on the opposite side to the vertical surface 16a has a tapered surface with a smaller diameter on the seal housing groove 15b side. 16b.

  The second flow path member 12 has an inner cylindrical portion 17 at a first end (a left end in FIG. 1) and a cylindrical shape at a second end (a right end in FIG. 1). Electrofusion portions 18 (hereinafter, referred to as EF portions 18) are formed. In the vicinity of the EF section 18 on the outer peripheral surface of the inner cylindrical section 17, an annular engagement projection 19 as an engagement section is formed. In the engagement convex portion 19, the wall surface on the EF portion 18 side forms a vertical surface 19a with respect to the tube axis L, and the wall surface on the opposite side to the vertical surface 19a has a small diameter on the opening 17a side of the inner cylindrical portion 17. Tapered surface 19b.

  A step 18a is formed on the inner peripheral surface of the EF portion 18. On the inner peripheral surface of the EF portion 18, the inner diameter on the first end side from the step 18a is the same as the inner diameter on the inner cylindrical portion 17, and the inner diameter on the second end side from the step 18a is Larger than the inner diameter of

  A coil 20 is embedded in the EF section 18 around the tube axis L. A pair of terminals 21 that are electrically connected to the coil 20 are attached to the outer peripheral surface of the EF section 18. Then, after inserting a synthetic resin pipe (not shown) through the opening 18 b and pushing the pipe to the step 18 a with respect to the EF section 18, the coil 20 is energized through the terminal 21, so that the EF section 18 is energized. Is melted, and the EF portion 18 and the pipe are joined to each other.

  Now, as shown in FIGS. 2 and 3, in order to assemble the pipe joint into the state shown in FIG. 1, first, insert the in-core 14 from the opening 17 a into the inner cylindrical portion 17 of the second flow path member 12. (Press fit). The in-core 14 is a short piece arranged only in the vicinity of the opening 17a in the inner cylindrical portion 17, and has not reached the position corresponding to the inside of the engaging projection 19 away from the opening 17a. That is, the incore 14 is not in contact with the region R1 corresponding to the inside of the engagement convex portion 19 or the region located near the region R1 with respect to the inner peripheral surface of the inner cylindrical portion 17.

As shown in FIGS. 1 and 3, the second flow path member 12 in which the insertion of the in-core 14 has been completed has an inner cylindrical part 17 with respect to an outer cylindrical part 15 of the first flow path member 11. It is inserted from the opening 15c. When the insertion of the inner cylinder portion 17 into the outer cylinder portion 15 is started, the engaging projection 19 of the inner cylinder portion 17 comes into contact with the inner peripheral surface of the opening 15c of the outer cylinder portion 15 with the tapered surface 19b. By the guide of the tapered surface 19b, the diameter is reduced by utilizing the elasticity provided by the inner cylindrical portion 17 being made of resin. At this time, since the incore 14 is not in contact with the region R1 corresponding to the inside of the engagement projection 19 and the region located near the region R1 on the inner peripheral surface of the inner cylindrical portion 17, the engagement is not performed. The elastic deformation (diameter reduction) of the projection 19 is not hindered by the in-core 14.

When the inner cylindrical portion 17 is further pushed into the outer cylindrical portion 15, the engaging convex portion 19 reaches the engaging concave portion 16 of the outer cylindrical portion 15, and the elastic force accumulated in the inner cylindrical portion 17 is reduced. The engagement projection 19 is released, and the diameter of the engagement projection 19 expands and enters the engagement recess 16. Therefore, the vertical surface 19a of the engaging projection 19 is opposed to the vertical surface 16a of the engaging concave portion 16 before and after in the direction along the tube axis L. Therefore, the contact between the vertical surface 16a and the vertical surface 19a restricts the second flow path member 12 from coming out of the first flow path member 11. It is to be noted that the inner cylinder portion 17 is further pushed into the outer cylinder portion 15 than in the state shown in FIG. 1 because the distal end surface of the inner cylinder portion 17 contacts the step 15 a of the outer cylinder portion 15. .

As shown in FIG. 1, in a state in which the so-called snap engagement between the first flow path member 11 and the second flow path member 12 is completed, a portion of the inner cylinder portion 17 directly reinforced by the in-core 14. Will face the seal ring 13 and the seal accommodating groove 15b. That is, the incore 14 is in contact with the inner peripheral surface of the inner cylindrical portion 17 at a position including the region R2 corresponding to the inside of the seal ring 13 and the seal accommodating groove 15b.

The portion of the inner cylindrical portion 17 directly reinforced by the in-core 14 maintains a predetermined roundness even after the step of snap-engaging the first flow path member 11 and the second flow path member 12. Easy to do. Therefore, the roundness of the seal ring 13 can be suitably set, and the sealing performance between the inner peripheral surface of the outer cylindrical portion 15 and the outer peripheral surface of the inner cylindrical portion 17 can be improved.

As described above, in the present embodiment, before the first channel member 11 and the second channel member 12 are snap-engaged, an assembly procedure for inserting the in-core 14 into the second channel member 12 is performed. Has adopted. Therefore, the incore 14, which is a relatively small component, does not exist alone until the final stage of the assembly process, and loss of the incore 14 can be suppressed.

The present invention can be implemented, for example, in the following embodiments.
The seal accommodating groove 15b is formed not on the inner peripheral surface of the outer cylindrical portion 15 but on the outer peripheral surface of the inner cylindrical portion 17.

In the inner peripheral surface of the outer cylindrical portion 15, the engaging recess 16 is formed at a position far from the opening 15c, and the seal accommodating groove 15b is formed at a position close to the opening 15c. Accordingly, the engaging projection 19 is formed on the outer peripheral surface of the inner cylindrical portion 17 at a position close to the opening 17a.

O Inserting the in-core 14 into the second flow path member 12 from the opening 18b of the EF section 18.

○ A long one extending from the opening 17a of the inner cylindrical portion 17 to the region R1 is used as the in-core 14. In this case, the portion corresponding to the region R1 and the portion corresponding to the vicinity of the region R1 are located outside the portion corresponding to the region R1 and the region R1 so that the incore 14 does not contact the inner peripheral surface of the inner cylindrical portion 17 near the region R1 and the region R1. The diameter is made smaller than the inner diameter of the inner cylindrical portion 17 so that the in-core 14 does not hinder the elastic deformation (diameter reduction) of the engagement convex portion 19.

○ An assembly procedure for inserting the incore 14 into the inner cylindrical portion 17 after the snap engagement between the first flow path member 11 and the second flow path member 12 is completed is adopted.

11 ... first flow path member, 12 ... second flow path member, 13 ... seal ring, 14 ... in core, 15 ... outer cylinder part, 17 ... inner cylinder part, 16 ... engagement concave part as engaged part, 19 ... An engagement protrusion as an engagement portion, R1... A region corresponding to the inside of the engagement portion, R2... A region corresponding to the inside of the seal ring.

Claims (1)

A first flow path member having an outer cylindrical part, a second flow path member having a resin inner cylindrical part, and a seal ring for sealing between an outer peripheral surface of the inner cylindrical part and an inner peripheral surface of the outer cylindrical part. And a joint for piping provided with an in- core separate from the first flow path member , wherein the inner cylinder is inserted into the outer cylinder, and an engagement formed on an outer peripheral surface of the inner cylinder. The part is snap-engaged with an engaged part formed on the inner peripheral surface of the outer cylinder part by utilizing elasticity provided by the inner cylinder part being made of resin, and the inner cylinder part of the in-core is inserted in the inside, the before the first flow path member and the second flow path member is the snap engagement, the piping fittings to complete the insertion arrangement to the inner cylinder portion of the in-core At
The in-core is in contact with the inner peripheral surface of the inner cylindrical portion at a position that includes a region corresponding to the inside of the seal ring and does not include a region corresponding to the inside of the engagement portion,
The pipe joint according to claim 1, wherein the incore does not face a region corresponding to an inner side of the engagement portion with respect to an inner peripheral surface of the inner cylinder portion.

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