JP6870430B2 - Pipe fitting - Google Patents

Description

The present invention relates to pipe fittings.

As shown in Patent Document 1, as a pipe joint for a pipe through which a fluid flows, a tubular joint body (first cylinder) and a pipe inserted from the axial end of the joint body are the same. A holding member for holding the holding member on the joint body and a tubular cap (second cylinder) for attaching the holding member to the joint body are known. The cap of the joint is for attaching the holding member to the joint body by sandwiching the holding member with the joint body when the end (insertion end) of the joint body is inserted into the open end. is there.

An inward claw portion is formed on the inner peripheral surface of the open end of the cap, while an outward claw portion is formed on the outer peripheral surface of the insertion end of the joint body. Then, when the insertion end of the joint body is inserted into the open end of the cap and the outward claw portion gets over the inward claw portion, the outward claw portion and the inward claw portion are engaged with each other. The cap is prevented from coming off from the joint body through the engagement between the outward claw portion and the inward claw portion, and the cap prevents the holding member from coming off from the joint body. Then, when the pipe is inserted from the insertion end side of the joint body in the pipe joint, the pipe is held by the holding member so as not to come off from the joint body.

Japanese Unexamined Patent Publication No. 2016-89878

By the way, the pipe joint may be installed in a narrow place such as inside a cover, and in order to improve workability in such a case, the part having the largest outer diameter in the pipe joint, that is, the open end of the cap and the joint body It is required to keep the portion where the insertion end overlaps in the radial direction as small as possible. However, in order to meet such a demand, if the radially overlapping portions of the open end of the cap and the insertion end of the joint body are thinned in the radial direction, it is inevitable that the strength of the portions will decrease. As a result, when the outward claws get over the inward claws with the insertion of the insertion end of the joint body with respect to the open end of the cap, they are larger in the radial direction than the portion where the insertion end and the opening end overlap in the radial direction. The part may be damaged by the action of force.

An object of the present invention is to provide a pipe joint capable of ensuring the strength required in the above portion while keeping the outer diameter of the portion of the first cylinder and the second cylinder that overlaps in the radial direction between the opening end and the insertion end small. To provide.

Hereinafter, means for solving the above problems and their actions and effects will be described.
The pipe joint that solves the above problems includes a first cylinder and a second cylinder, and the insertion end formed in one of the first cylinder and the second cylinder is the first cylinder and the second cylinder. It is inserted into the open end formed on the other side of the. Then, the inward claw portion formed on the inner peripheral surface of the opening end and the outward claw portion formed on the outer peripheral surface of the insertion end are engaged so that the insertion end does not come off from the opening end. The inward claw portion has a large diameter inward claw portion located near the opening of the opening end and a large diameter inward claw portion located away from the opening of the opening end and having the same large diameter inward claw portion as the large diameter inward claw portion. It is a small-diameter inward-facing claw portion having an inner diameter smaller than that of the portion. Further, the outward-facing claws are located closer to the opening of the insertion end and are located farther from the opening of the insertion end than the small-diameter outward-facing claws and the small-diameter outward-facing claws. It is a large-diameter outward-facing claw that has an outer diameter larger than that of the claw. Then, the small-diameter inward claw portion of the opening end and the small-diameter outward claw portion of the insertion end are engaged with each other, and the large-diameter inward claw portion of the opening end and the large-diameter outward claw portion of the insertion end are engaged. Is designed to engage with.

According to the above configuration, in the portion of the first cylinder and the second cylinder where the opening end and the insertion end overlap in the radial direction, the radial thickness of the portion forming the large-diameter outward claw portion at the insertion end is , It becomes thicker than the radial thickness of the portion forming the large-diameter inward claw portion at the opening end. Further, the radial thickness of the portion forming the small diameter inward claw portion at the opening end is larger than the radial thickness of the portion forming the small diameter outward claw portion at the insertion end. Therefore, even if the portion of the first cylinder and the second cylinder where the opening end and the insertion end overlap in the radial direction, that is, the portion having the largest outer diameter in the pipe joint can be suppressed to a small size, the large diameter outward claw at the insertion end It is possible to secure the required strength for each of the radial thickness of the portion forming the portion and the radial thickness of the portion forming the small diameter inward claw portion at the opening end. Can be set to any value.

According to the present invention, it is possible to secure the strength required for the above portion while keeping the outer diameter of the portion of the first cylinder and the second cylinder that overlaps in the radial direction between the opening end and the insertion end small.

Sectional drawing which shows the whole pipe joint. An enlarged cross-sectional view showing an engagement mode between a joint body and a cap. An enlarged cross-sectional view showing an engagement mode between a joint body and a cap. Sectional drawing which shows the whole pipe joint. Sectional drawing which shows the whole pipe joint.

[First Embodiment]
Hereinafter, the first embodiment of the pipe joint will be described with reference to FIGS. 1 and 2.
The pipe joint 1 shown in FIG. 1 is for connecting pipes 2 through which a fluid flows, and includes a joint body 4 formed in a tubular shape. The joint body 4 serves as a first cylinder. The pipe 2 on the upstream side (right side in FIG. 1) is inserted into the joint body 4 from one end (right end in FIG. 1) of the joint body 4 in the axial direction. On the other hand, the pipe 2 on the downstream side (left side in FIG. 1) is inserted into the joint body 4 from the other end (left end in FIG. 2) in the axial direction of the joint body 4. Since the upstream side and the downstream side of the pipe joint 1 have the same structure, only the upstream side will be described in detail below, and the downstream side will be designated by the same reference numerals as the upstream side and the description thereof will be omitted.

On the inner peripheral surface of the joint body 4, an annular protrusion 5 is formed at the center of the joint body 4 in the axial direction. Further, on the inner peripheral surface of the joint main body 4, an accommodating portion 6 for accommodating the end portion of the pipe 2 is provided at a portion near the end portion of the joint main body 4 adjacent to the annular protrusion 5. A tubular in-core 7 is inserted at the end of the pipe 2. The immersion of the in-core 7 in the pipe 2 is suppressed by the flange 7a formed at the end of the in-core 7. Then, the end portion of the pipe 2 into which the in-core 7 is inserted is inserted from the end portion of the joint body 4 and is accommodated in the accommodating portion 6.

On the inner peripheral surface of the joint main body 4, a seal portion 8 having a diameter larger than that of the accommodating portion 6 is provided in a portion between the accommodating portion 6 and the end portion of the joint main body 4. In the seal portion 8, the seal ring 9, the spacer 10, the seal ring 11, and the holding ring 12 are arranged in this order from the accommodating portion 6 side toward the end side of the joint body 4. Then, when the end of the pipe 2 is inserted into the accommodating portion 6 of the joint body 4, the pipe 2 penetrates the seal ring 9, the spacer 10, the seal ring 11, and the holding ring 12. At this time, the seal rings 9 and 11 in the seal portion 8 are in contact with the outer peripheral surface of the pipe 2, so that the fluid flowing in the joint body 4 is brought into contact with the outer peripheral surface of the pipe 2 and the inner peripheral surface of the joint body 4. Leakage from the gap to the outside of the pipe joint 1 is suppressed.

Further, the pipe joint 1 includes a holding member 13 for holding the pipe 2 to the joint body 4, and a cap 14 for attaching the holding member 13 to the joint body 4. The holding member 13 is provided with an annular lock ring 17 located between the fitting ring 15 and the split ring 16. The holding member 13 is located adjacent to the holding ring 12 arranged in the seal portion 8 of the joint body 4. Further, the cap 14 is formed in a cylindrical shape and plays a role as a second cylinder. The cap 14 is in a state in which the end portion (insertion end) of the joint body 4 is inserted into the open end (end portion on the joint body 4 side), whereby the holding member 13 is inserted into the joint body 4 (holding ring). It is sandwiched between 12).

The cap 14 is attached to the joint body 4 by engaging the open end with the insertion end at a portion that overlaps the insertion end of the joint body 4 in the radial direction. By attaching the cap 14 to the joint body 4 in this way, the holding member 13 sandwiched between the joint body 4 and the cap 14 can be attached to the joint body 4. When the holding member 13 is attached to the joint body 4 by the cap 14, the end of the pipe 2 penetrates the holding member 13 and the cap 14 and is inserted into the accommodating portion 6 from the insertion end of the joint body 4. , The lock ring 17 of the holding member 13 presses the outer peripheral surface of the pipe 2, thereby preventing the pipe 2 from coming out of the joint body 4.

Next, the engagement mode between the cap 14 and the joint body 4 will be described in detail.
As shown in FIG. 2, of the portions overlapping in the radial direction (vertical direction in FIG. 2) between the open end of the cap 14 and the insertion end of the joint body 4, the inner peripheral surface of the open end of the cap 14 has a large diameter. The facing claw portion 19a and the small diameter inward claw portion 19b are formed. The large-diameter inward claw portion 19a is located near the opening of the opening end of the cap 14. On the other hand, the small-diameter inward-facing claw portion 19b is located farther from the opening at the opening end than the large-diameter inward-facing claw portion 19a, and has an inner diameter smaller than that of the large-diameter inward-facing claw portion 19a. There is.

Further, among the portions that overlap in the radial direction between the open end of the cap 14 and the insertion end of the joint body 4, the small diameter outward claw portion 18a and the large diameter outward claw portion 18b are provided on the outer peripheral surface of the insertion end of the joint body 4. It is formed. The small-diameter outward-facing claw portion 18a is located near the opening of the insertion end in the joint body 4. On the other hand, the large-diameter outward-facing claw portion 18b is located farther from the opening of the insertion end than the small-diameter outward-facing claw portion 18a, and has an outer diameter larger than that of the small-diameter outward-facing claw portion 18a. There is. Then, the small diameter outward claw portion 18a of the joint body 4 engages with the small diameter inward claw portion 19b of the cap 14, and the large diameter outward claw portion 18b of the joint body 4 is the large diameter inward claw portion 19a of the cap 14. Engage with.

As described above, the large diameter inward claw portion 19a and the small diameter inward claw portion 19b are formed on the inner peripheral surface of the opening end of the cap 14, and the small diameter outward claw portion 18a is formed on the outer peripheral surface of the insertion end of the joint body 4. By forming the large-diameter outward-facing claw portion 18b, the thickness of the portion where the opening end and the insertion end overlap in the radial direction can be made as shown in (A) and (B) below.

(A) The radial thickness TH2 of the portion of the joint body 4 forming the large-diameter outward-facing claw portion 18b at the insertion end is formed, and the large-diameter inward-facing claw portion 19a of the opening end of the cap 14 is formed. The radial thickness of the portion is made thicker than TH1.

(B) The radial thickness TH4 of the portion of the cap 14 forming the small-diameter inward claw portion 19b of the opening end is the portion of the joint body 4 forming the small-diameter outward claw portion 18a of the insertion end. The thickness in the radial direction is made thicker than TH3.

The small diameter outward claw portion 18a of the joint body 4 has a slope 21a and a vertical surface 21b. In the small-diameter outward-facing claw portion 18a, the vertical surface 21b extends in a direction orthogonal to the axis of the joint body 4, while the slope 21a extends from the vertical surface 21b side toward the opening of the insertion end in the joint body 4. It is tilted to approach. Further, the large-diameter outward claw portion 18b of the joint body 4 has a slope 23a and a vertical surface 23b. In the large-diameter outward claw portion 18b, the vertical surface 23b extends in a direction orthogonal to the axis of the joint body 4, while the slope 23a extends from the vertical surface 23b side toward the opening of the insertion end in the joint body 4. It is tilted to approach.

The large-diameter inward claw portion 19a of the cap 14 has a parallel surface 24a and a vertical surface 24b. In the large-diameter inward claw portion 19a, the vertical surface 24b extends in a direction orthogonal to the axis of the cap 14, while the parallel surface 24a is aligned with the axis from the vertical surface 24b side toward the opening of the opening end of the cap 14. It extends in parallel. Further, the small diameter inward claw portion 19b of the cap 14 has a slope 22a and a vertical surface 22b. In the small-diameter inward claw portion 19b, the vertical surface 22b extends in a direction orthogonal to the axis of the cap 14, while the slope 22a is inclined so as to move away from the axis from the vertical surface 22b side toward the opening of the opening end. ing.

When attaching the cap 14 removed from the joint body 4 to the joint body 4, the cap 14 and the joint body 4 are arranged on the same axis, and the large-diameter inward claw portion 19a side of the cap 14 is joined. The cap 14 is moved to the joint main body 4 side in a state of facing the small diameter outward claw portion 18a side of the main body 4. As a result, the large-diameter inward-facing claw portion 19a of the cap 14 overcomes the small-diameter outward-facing claw portion 18a and the large-diameter outward-facing claw portion 18b of the joint body 4, and the small-diameter inward-facing claw portion 19b of the cap 14 is attached to the joint body 4. Overcome the small diameter outward claw portion 18a. As a result, the insertion end of the joint body 4 is inserted into the open end of the cap 14.

In a state where the insertion end of the joint body 4 is inserted into the open end of the cap 14, the small diameter outward claw portion 18a of the joint body 4 and the small diameter inward claw portion 19b of the cap 14 are engaged, and the joint body 4 The large-diameter outward-facing claw portion 18b and the large-diameter inward-facing claw portion 19a of the cap 14 engage with each other. Specifically, the vertical surface 21b of the small-diameter outward-facing claw portion 18a and the vertical surface 22b of the small-diameter inward-facing claw portion 19b are located so as to face each other in the axial direction of the joint body 4 and the cap 14, and the large-diameter outward-facing claw portion The vertical surface 23b of 18b and the vertical surface 24b of the large-diameter inward claw portion 19a are located so as to face each other in the axial direction. Under this state, when the cap 14 tries to separate from the joint body 4, the vertical surfaces 21b and the vertical surfaces 22b facing each other come into contact with each other, and the vertical surfaces 23b and the vertical surfaces 24b also facing each other come into contact with each other. Come in contact with. As a result, the cap 14 is prevented from coming off from the joint body 4.

Next, the operation of the pipe joint 1 in the present embodiment will be described.
At the portion where the open end of the cap 14 and the insertion end of the joint body 4 overlap in the radial direction, the thickness TH2 shown in FIG. 2 becomes thicker than the thickness TH1 as shown in (A) and (B) above. At the same time, the thickness TH4 becomes thicker than the thickness TH3. By increasing the thicknesses TH2 and TH4 in this way, the portion where the open end of the cap 14 and the insertion end of the joint body 4 overlap in the radial direction (the portion having the largest outer diameter in the pipe joint 1) can be suppressed to a small size. Even so, the thicknesses TH2 and TH4 can be set to values that can secure the required strengths, respectively. Therefore, when the insertion end of the joint body 4 is inserted into the open end of the cap 14, the large diameter inward claw portion 19a overcomes the small diameter outward claw portion 18a and the large diameter outward claw portion 18b, and the small diameter inward claw portion 19b Even if a large radial force acts on the above-mentioned portion when overcoming the small-diameter outward-facing claw portion 18a, it is possible to prevent the portion from being damaged.

According to the present embodiment described in detail above, the following effects can be obtained.
(1) At the portion where the open end of the cap 14 and the insertion end of the joint body 4 overlap in the radial direction, in other words, the portion where the outer diameter of the pipe joint 1 is the largest, it is necessary for the above portion while keeping the outer diameter small. It is possible to secure the required strength.

(2) Even if a large radial force acts on the portion where the open end of the cap 14 and the insertion end of the joint body 4 overlap in the radial direction to cause damage, the damage is large at the open end of the cap 14. It occurs in a thin portion such as a portion forming the inward diameter claw portion 19a or a portion forming the small diameter outward claw portion 18a at the insertion end of the joint body 4. Therefore, the cap 14 is a thick portion such as a portion forming a small diameter inward claw portion 19b at the opening end of the cap 14 or a portion forming a large diameter outward claw portion 18b at the insertion end of the joint body 4. And the engagement with the joint body 4 can be maintained to maintain the function as the pipe joint 1.

[Second Embodiment]
Next, a second embodiment of the pipe joint will be described with reference to FIG.
As shown in FIG. 3, in this embodiment, a plurality of small diameter outward claw portions 18a and small diameter inward claw portions 19b are provided (two in this example) at intervals in the axial direction of the joint body 4 and the cap 14. Has been done. By providing a plurality of small diameter outward claw portions 18a and small diameter inward claw portions 19b in this way, even if the protrusion amount of the small diameter outward claw portion 18a and the small diameter inward claw portion 19b is reduced, these small diameter outward claw portions are provided. The 18a and the small diameter inward claw portion 19b can be engaged with each other.

According to this embodiment, in addition to the effects of (1) and (2) in the first embodiment, the following effects can be obtained.
(3) By reducing the amount of protrusion of the small diameter outward claw portion 18a and the small diameter inward claw portion 19b, when the insertion end of the joint body 4 is inserted into the open end of the cap 14, the large diameter inward claw portion of the cap 14 is inserted. The 19a easily gets over the small diameter outward claw portion 18a of the joint body 4. In other words, when the insertion end of the joint body 4 is inserted into the open end of the cap 14, a large radial force acts on a portion of the open end of the cap 14 and the insertion end of the joint body 4 that overlaps in the radial direction. It is possible to prevent the above-mentioned part from being damaged by the force.

[Third Embodiment]
Next, a third embodiment of the pipe joint will be described with reference to FIG.
As shown in FIG. 4, in the pipe joint 1 of this embodiment, the nipple type joint main body 4 is adopted, and the pipe 2 is not used for the joint main body 4 without using the in-core 7 as in the first embodiment. I try to connect.

An inner cylinder portion 31 is formed at the end of the joint body 4 in the axial direction, and an outer cylinder 32 is provided so as to surround the outer circumference of the inner cylinder portion 31. The outer cylinder 32 is fixed to the joint body 4 and serves as a first cylinder. Then, the pipe 2 is connected to the joint body 4 by being inserted between the outer peripheral surface of the inner cylinder portion 31 and the inner peripheral surface of the outer cylinder 32.

An annular grooves 33 and 34 in which the seal rings 9 and 11 are housed are formed on the outer peripheral surface of the inner cylinder portion 31. When the pipe 2 is inserted between the outer peripheral surface of the inner cylinder portion 31 and the inner peripheral surface of the outer cylinder 32, the seal rings 9 and 11 are in contact with the inner peripheral surface of the pipe 2. This prevents the fluid flowing in the joint body 4 from leaking to the outside of the pipe joint 1 from between the inner peripheral surface of the pipe 2 and the outer peripheral surface of the inner cylinder portion 31.

The end (insertion end) of the outer cylinder 32 is in a state of being inserted into the open end of the cap 14. The cap 14 is attached to the joint body 4 by sandwiching a holding member 13 for holding the pipe 2 in the joint body 4 between the end face and the end surface of the outer cylinder 32. The holding member 13 has a split ring 35 that positions the lock ring 17 with the end of the outer cylinder 32. Then, when the pipe 2 is inserted between the outer peripheral surface of the inner cylinder portion 31 and the inner peripheral surface of the outer cylinder 32, the lock ring 17 presses the outer peripheral surface of the pipe 2 and thereby the joint of the pipe 2. It is prevented from coming out of the main body 4.

On the outer peripheral surface of the insertion end of the outer cylinder 32, a small diameter outward claw portion 18a that engages with the small diameter inward claw portion 19b of the cap 14 and a large diameter that engages with the large diameter inward claw portion 19a of the cap 14 An outward claw portion 18b is formed.

According to this embodiment, the same effects as those of (1) and (2) of the first embodiment can be obtained.
[Fourth Embodiment]
Next, a fourth embodiment of the pipe joint will be described with reference to FIG.

As shown in FIG. 5, the pipe joint 1 of this embodiment is different from the third embodiment in that the outer cylinder 32 has an open end and the cap 14 has an insertion end. That is, by inserting the insertion end of the cap 14 into the open end of the outer cylinder 32, the cap 14 sandwiches the holding member 13 with the end face of the outer cylinder 32 and attaches it to the joint body 4.

A large-diameter inward-facing claw portion 19a and a small-diameter inward-facing claw portion 19b are formed on the inner peripheral surface of the opening end of the outer cylinder 32. The large-diameter inward claw portion 19a is located near the opening of the opening end of the outer cylinder 32, and has a parallel surface 24a and a vertical surface 24b. Further, the small-diameter inward-facing claw portion 19b is located farther from the opening at the opening end than the large-diameter inward-facing claw portion 19a, and has a slope 22a and a vertical surface 22b.

A small diameter outward claw portion 18a and a large diameter outward claw portion 18b are formed on the outer peripheral surface of the insertion end of the cap 14. The small-diameter outward-facing claw portion 18a is located near the opening of the insertion end of the cap 14, and has a slope 21a and a vertical surface 21b. Further, the large-diameter outward-facing claw portion 18b is located farther from the opening of the insertion end than the small-diameter outward-facing claw portion 18a, and has a slope 23a and a vertical surface 23b.

Also in this embodiment, the same effects as those in (1) and (2) of the first embodiment can be obtained.
[Other Embodiments]
Each of the above embodiments can be changed as follows, for example.

-In the first to fourth embodiments, regarding the amount of protrusion of the small diameter outward claw portion 18a, the distance from the axis of the joint body 4 and the cap 14 to the tip of the small diameter outward claw portion 18a in the protruding direction is a large diameter from the axis. The value may be equal to or less than the distance to the inward claw portion 19a. In this case, when the cap 14 removed from the joint body 4 or the outer cylinder 32 is attached to the joint body 4 or the outer cylinder 32, the large-diameter inward claw portion 19a passes through the small-diameter outward claw portion 18a without getting over it. become able to. Therefore, the small diameter outward claw portion 18a and the large diameter outward claw portion 18b can be easily engaged with the small diameter inward claw portion 19b and the large diameter inward claw portion 19a.

-In the first to fourth embodiments, a plurality of large-diameter inward-facing claws 19a and large-diameter outward-facing claws 18b may be provided at intervals in the axial direction of the joint body 4 and the cap 14. In this case, even if the protruding amount of the large-diameter inward-facing claw portion 19a and the large-diameter outward-facing claw portion 18b is reduced, the large-diameter inward-facing claw portion 19a and the large-diameter outward-facing claw portion 18b are engaged with each other. Can be done.

-In the first embodiment, the third embodiment, and the fourth embodiment, a plurality of small diameter inward claw portions 19b and small diameter outward claw portions 18a are provided at intervals in the axial direction of the joint body 4 and the cap 14. You may do it.

1 ... Pipe fitting, 2 ... Piping, 4 ... Joint body, 5 ... Ring protrusion, 6 ... Accommodating part, 7 ... Incore, 7a ... Flange, 8 ... Sealing part, 9 ... Seal ring, 10 ... Spacer, 11 ... Seal ring , 12 ... Holding ring, 13 ... Holding member, 14 ... Cap, 15 ... Fitting ring, 16 ... Split ring, 17 ... Lock ring, 18a ... Small diameter outward claw, 18b ... Large diameter outward claw, 19a ... Large-diameter inward-facing claw, 19b ... Small-diameter inward-facing claw, 21a ... Slope, 21b ... Vertical surface, 21a ... Slope, 22b ... Vertical surface, 23a ... Slope, 23b ... Vertical surface, 24a ... Parallel surface, 24b ... Vertical Surface, 31 ... Inner cylinder, 32 ... Outer cylinder, 33 ... Circular groove, 34 ... Circular groove, 35 ... Split ring.

Claims (1)

It is provided with a joint body, a lock ring for holding the pipe to the joint body, and a cap for holding the lock ring and attaching the lock ring to the joint body, and is formed on the joint body. The insertion end is inserted into the opening end formed in the cap , and the inward claw portion formed on the inner peripheral surface of the opening end and the inward claw portion formed on the inner peripheral surface of the opening end so that the insertion end does not come off from the opening end. In a pipe joint in which an outward claw portion formed on the outer peripheral surface of the insertion end is engaged.
The inward claw portion is located on the lock ring side of the large diameter inward claw portion located near the opening of the opening end and the large diameter inward claw portion away from the opening of the opening end. It is a small diameter inward claw part with an inner diameter smaller than that of the same large diameter inward claw part.
The outward claw portion is located closer to the opening of the insertion end and is located away from the opening of the insertion end than the small diameter outward claw portion and the small diameter outward claw portion. Is a large-diameter outward-facing claw with a large outer diameter.
The small-diameter inward-facing claw at the opening end and the small-diameter outward-facing claw at the insertion end engage with each other, and the large-diameter inward-facing claw at the opening end and the large-diameter outward-facing claw at the insertion end. A pipe joint characterized in that it engages with.

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