JP7316537B2 - In-core for piping materials and fittings for piping - Google Patents

Description

TECHNICAL FIELD The present invention relates to an in-core that is used by inserting it into a piping member for hot water supply, for example, and a piping joint provided with the in-core.

As shown in FIG. 6, the piping joint 100 of Patent Document 1 includes a first channel member 101 having an outer cylindrical portion 101a and a second flow path member 101 having an inner cylindrical portion 102a inserted into and snap-engaged with the outer cylindrical portion 101a. It has a channel member 102 and a cylindrical in-core 103 inserted into the inner cylindrical portion 102a to strengthen the snap engagement between the inner cylindrical portion 102a and the outer cylindrical portion 101a. In the inner core 103, a tapered surface 104a is formed on the outer peripheral surface of the end portion 104 located on the insertion side into the inner cylindrical portion 102a to facilitate the insertion.

JP 2017-125549 A

However, in the piping joint 100 of Patent Document 1, if the inclination angle of the tapered surface 104a is set small in order to facilitate the insertion of the inner core 103 into the inner cylindrical portion 102a, the end portion 104 of the inner core 103 becomes sharp. . Therefore, there is a problem that the inner peripheral surface of the inner cylindrical portion 102a is scraped by the tip surface 104b of the inner core 103 during the insertion.

In particular, in the piping joint 100 of Patent Document 1, the end portion 104 of the in-core 103 inserted shallowly is temporarily held at the end located on the insertion side of the in-core 103 on the inner peripheral surface of the inner cylindrical portion 102a. A plurality of temporary holding portions 105 are provided at intervals in the circumferential direction. That is, a meat portion (temporary holding portion 105) partially exists in the circumferential direction on the inner peripheral surface of the inner cylindrical portion 102a. Therefore, on the inner peripheral surface of the inner cylindrical portion 102a, the insertion force of the inner core 103 tends to concentrate on the temporary holding portion 105, and the problem that the inner peripheral surface of the inner cylindrical portion 102a is scraped has become conspicuous. .

An object of the present invention is to provide an in-core that can be easily inserted into a piping member and that prevents the piping member from being scraped during the insertion at a high level. Also, to provide a piping joint having the in-core.

In order to achieve the above object, the invention according to claim 1 is a cylindrical in-core that is used by being inserted into a piping member, wherein the outer peripheral surface of the end located on the insertion side of the piping member is A tapered surface having a smaller diameter as it approaches the tip surface of the end is formed, and the portion adjacent to the tip surface on the inner peripheral surface has a smaller diameter than the portion away from the tip surface. .

In order to achieve the above object, the invention according to claim 2 provides a first flow path member having an outer tubular portion, a second flow path member having an inner tubular portion inserted into and snap-engaged with the outer tubular portion, and an inner core inserted into the inner cylindrical portion to strengthen the snap engagement, and an end located on the insertion side of the inner core on the inner peripheral surface of the inner cylindrical portion extends in the circumferential direction. A plurality of recesses are formed, and temporary holding portions are respectively provided between the plurality of recesses, and the temporary holding portions hold the inner core when the end portion of the inner core is temporarily inserted into the inner cylindrical portion. In the pipe joint to be held, in the inner core, the outer peripheral surface of the end portion located on the insertion side into the inner cylinder portion has a tapered surface that decreases in diameter as it approaches the tip surface of the end portion. is formed, and a portion of the inner peripheral surface of the in-core adjacent to the tip end face has a smaller diameter than a portion away from the tip end face.

BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal cross-sectional view of the joint for piping which shows one Embodiment. FIG. 2 is an enlarged view of a main portion of FIG. 1; FIG. 4 is a vertical cross-sectional view of the second channel member; FIG. 5 is a longitudinal sectional view showing a state in which the inner core is temporarily inserted into the second channel member; The vertical cross-sectional view of the joint for piping which shows another example. FIG. 3 is a vertical cross-sectional view showing a conventional piping joint.

An embodiment embodying the present invention will be described with reference to FIGS. 1 to 4. FIG.
As shown in FIG. 1, the piping joint 1 includes a cylindrical first flow path member 2 made of metal, resin, or the like, and a cylindrical second flow path member made of resin engaged with the first flow path member 2. 3, and an inner core 4 made of metal or hard resin, which is inserted into the second flow path member 3 as a piping member and is used to achieve long-term engagement between the first flow path member 2 and the second flow path member 3. and

A male thread 5 for connecting the piping joint 1 to a device (not shown) such as a water heater is formed on the outer peripheral surface of the first flow path member 2 at one end (the left end in FIG. 1). ing. An outer cylindrical portion 6 for mounting the second flow path member 3 is provided on the other end (right end in FIG. 1) of the first flow path member 2 . On the inner peripheral surface of the outer cylindrical portion 6, an inward claw portion 8 and two accommodation grooves 10 each accommodating a seal ring 9 are formed annularly in the circumferential direction.

A heating wire coil 13 is embedded in one end (the right end in FIG. 1) of the second channel member 3 . A pair of electrodes 14 connected to the heating wire coil 13 protrude outward from the second channel member 3 . With a resin pipe (not shown) inserted into the heating wire coil 13, by energizing the heating wire coil 13 through the pair of electrodes 14, the resin pipe and the second flow path member 3 are connected. are melted and joined together.

An inner cylindrical portion 12 is provided on the other end (left end in FIG. 1) of the second flow path member 3 . The inner tubular portion 12 is inserted into the outer tubular portion 6 of the first channel member 2 . An outward claw portion 16 is formed annularly in the circumferential direction on the outer peripheral surface of the inner cylindrical portion 12 . The outer tubular portion 6 (first flow path member 2) and the inner tubular portion 12 (second flow path member 3) are disengaged from each other by snap engagement of the inward claw portion 8 and the outward claw portion 16. being stopped.

A first step 18 positioned at the tip of the inner cylindrical portion 12 and a second step 19 positioned on the heating wire coil 13 side are provided on the inner peripheral surface of the second flow path member 3 . A cylindrical inner core 4 is inserted and arranged on the inner peripheral surface of the inner cylindrical portion 12 on the side of the second step 19 bordering on the first step 18 , that is, on the large diameter side. A flange 41a is formed on the outer peripheral surface of the first end portion 41 (right end portion in FIG. 1) of the inner core 4 . The flange 41 a abuts on the second step 19 to determine the insertion position of the inner core 4 with respect to the inner cylindrical portion 12 .

By inserting the inner core 4 into the inner tubular portion 12, the portion corresponding to the outward claw portion 16 in the inner tubular portion 12 is suppressed from being deformed in the diameter-reducing direction. Cancellation of the snap engagement with the claw portion 8 is suppressed. That is, the snap engagement between the outward claw portion 16 and the inward claw portion 8 is strengthened by the inner core 4, and the snap engagement is maintained for a long period of time.

As shown in FIG. 3 , a plurality of recesses 21 extending in the circumferential direction are formed on the inner peripheral surface of the inner cylindrical portion 12 at the end on the side of the second step 19 (the end located on the insertion side of the inner core 4). It is A temporary holding portion 23 is provided between adjacent recesses 21 . The temporary holding portions 23 are provided at equal intervals in the circumferential direction on the inner peripheral surface of the inner cylindrical portion 12 . As shown in FIG. 4 , the temporary holding portion 23 holds the second end portion 43 of the inner core 4 (the left end portion in FIG. 3 ; the end portion located on the insertion side into the inner tubular portion 12 ) against the inner tubular portion 12 . When inserted (temporarily inserted) shallower than a predetermined insertion position, the inner core 4 is securely held by pressing against the outer peripheral surface of the second end portion 43 .

Here, in some cases, an assembly procedure is adopted in which the inner tubular portion 12 is inserted into the outer tubular portion 6 of the first flow path member 2 in a state where the second end portion 43 of the inner core 4 is temporarily inserted into the inner tubular portion 12 . be. In this case, the recess 21 (see FIG. 3) formed in the inner peripheral surface of the inner cylindrical portion 12 facilitates deformation of the inner cylindrical portion 12 (outward claw portion 16) during the process of snap engagement. This is because the thickness of the temporary holding portion 23 in contact with the outer peripheral surface of the second end portion 43 of the inner core 4 escapes toward the recess 21 when the inner cylindrical portion 12 is about to deform in the diameter-reducing direction. is. Therefore, even when the inner core 4 is temporarily inserted into the inner tubular portion 12, the work of snap-engaging the inner tubular portion 12 with the outer tubular portion 6 is not difficult.

As shown in FIG. 2 , the tip surface 43 a of the second end portion 43 of the inner core 4 is a flat surface extending in a direction perpendicular to the axis of the inner core 4 . The outer peripheral surface of the second end portion 43 of the inner core 4 is formed with a tapered surface 43b that decreases in diameter as it approaches the distal end surface 43a. The tapered surface 43b facilitates insertion of the inner core 4 into the inner cylindrical portion 12. As shown in FIG. A portion of the inner peripheral surface of the second end portion 43 adjacent to the tip surface 43a protrudes radially inward from a portion away from the tip surface 43a and has a small diameter (small diameter portion 43c). The inner diameter of the cylindrical surface of the small diameter portion 43c is substantially the same as the inner diameter of the cylindrical surface of the first step 18 on the small diameter side.

Although the inner core 4 has the tapered surface 43b formed on the outer peripheral surface of the second end portion 43, the provision of the small diameter portion 43c ensures a relatively wide radial width or area of the tip surface 43a. It is Therefore, the second end portion 43 of the inner core 4 is not sharpened, and even under adverse conditions such as when the temporary holding portion 23 is provided as in the present embodiment, the insertion of the inner core 4 into the temporary holding portion 23 Concentration of power can be suppressed. Therefore, it is possible to avoid the problem that the inner peripheral surface of the inner cylindrical portion 12 is scraped by the front end surface 43a of the inner core 4 during the insertion.

In the inner peripheral surface of the in-core 4, the second end 43 of the in-core 4 can be sharpened by reducing the diameter of not only the portion adjacent to the tip end surface 43a but also the entire portion including the portion away from the tip end surface 43a. can be avoided. However, in this case, the thickness of the inner core 4 increases as a whole, resulting in an increase in weight and cost. The flow resistance that the fluid receives when passing through the inner core 4 also increases.

Considering these problems and ensuring the strength of the small-diameter portion 43c, which is a protruding portion, the size of the small-diameter portion 43c, particularly the length in the axial direction, should be the same from the tip end surface 43a to the tapered surface 43b. It is preferable that the corresponding degree is satisfied, and it is preferable that the length is half or less of the length in the axial direction of the inner core 4 at the longest and twice or less than the length of the tapered surface 43b in the axial direction.

(Another example)
The above embodiment can be modified, for example, as follows.
○ As shown in FIG. Since the structure of the push-in joint 51 is a well-known one including a lock ring 52, a seal ring 53, etc., detailed description thereof will be omitted.

The insertion of the inner core 62 into the resin pipe 61 is restricted by a flange 63 a formed on the first end portion 63 of the inner core 62 . The end of the resin pipe 61 into which the inner core 62 is inserted is inserted into the one-touch joint 51 and is retained by the lock ring 52 and watertight by the seal ring 53 .

The outer peripheral surface of the second end portion 64 of the inner core 62 is formed with a tapered surface 64b that decreases in diameter as it approaches the distal end surface 64a of the second end portion 64 . The tapered surface 64 b facilitates insertion of the inner core 62 into the resin pipe 61 . A portion of the inner peripheral surface of the second end portion 64 adjacent to the tip surface 64a protrudes radially inward from a portion away from the tip surface 64a and has a small diameter (small diameter portion 64c).

By providing the small-diameter portion 64c, although the tapered surface 64b is formed on the outer peripheral surface of the second end portion 64, the front end surface 64a of the inner core 62 has a relatively wide radial width, that is, an area. ing. Therefore, the second end portion 64 of the inner core 62 is not sharpened, and the inner peripheral surface of the resin pipe 61 can be prevented from being scraped by the tip surface 64a when the inner core 62 is inserted.

○ By making the inner peripheral surfaces of the inner cores 4, 62 tapered surfaces that decrease in diameter as they approach the tip surfaces 43a, 64a of the second end portions 43, 64, the tip surfaces 43a, 64a are formed on the tapered surfaces. The small diameter portions 43c and 64c are defined as the portions with the smallest diameter adjacent to the .

o Remove the flange 17 from the inner core 4,62.

DESCRIPTION OF SYMBOLS 1... Piping joint 2... 1st flow path member 3... 2nd flow path member 4... In core 6... Outer cylinder part 12... Inner cylinder part 21... Recess 23... Temporary holding part 43... Second end portion 43a... Tip end surface 43b... Tapered surface 43c... Small diameter portion.

Claims (2)

A cylindrical inner core that is used by being inserted into a piping member, wherein the outer peripheral surface of the end located on the insertion side of the piping member has a smaller diameter as it approaches the tip surface of the end. A tapered surface is formed, and a portion adjacent to the tip surface on the inner peripheral surface is protruded radially inward, and the inner diameter of the cylindrical surface of the protruded portion is smaller than that of the portion away from the tip surface , An in-core for a piping member, wherein the length in the axial direction of the small-diameter portion is half or less the length of the in-core in the axial direction and twice or less than the length of the tapered surface in the axial direction. a first channel member having an outer tubular portion; a second channel member having an inner tubular portion inserted into and snap-engaged with the outer tubular portion; A plurality of recesses extending in the circumferential direction are formed at an end portion located on the insertion side of the incore on the inner peripheral surface of the inner cylindrical portion, and between the plurality of recesses is provided with a temporary holding portion, and the temporary holding portion is a piping joint that holds the incore when the end of the incore is temporarily inserted into the inner cylindrical portion,
In the in-core, the outer peripheral surface of the end located on the insertion side into the inner cylindrical portion is formed with a tapered surface that decreases in diameter as it approaches the tip surface of the end. A joint for piping, wherein a portion of a surface adjacent to the tip end surface protrudes radially inward , and the inner diameter of the cylindrical surface of the projected portion is smaller than that of a portion away from the tip end surface.

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