JPH109455A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the slipping down of a packing from the joint body of a pipe joint. SOLUTION: The pipe joint is equipped with a pipe member 21 where a projecting part 25 having two inclined faces 25a, 25b is formed on an outer periphery near an end part; a joint body 22 where an external thread 27 is formed on the outer periphery of the end part, and the pipe member 21 is inserted in the inner periphery of the end part; a nut having an internal thread 29 to threadedly engage with the external thread 27 of the joint body 22 and a notched part 31 abutting on the inclined face 25a on one side of the projecting part 25 of the pipe joint 21; and an annular packing 24 which is arranged in an accommodating section 26 provided in the inner periphery of the end part of the joint body 22 and abuts on the inclined face 25b on the other side of the projecting part 25 of the pipe member 21. The accommodating section 26 has a stopper part 28 to check the movement of a packing 24 toward its outside. The stopper part 28 has a recessed part 28a or a protruded part 28b formed in the joint body 22, and a protruded part 24c or a recessed part 24d which fits in the concave part 28b or the covex part 28a of the joint body 22 is formed in the packing 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint, and more particularly to a pipe joint for connecting a thin stainless steel pipe having a projection near an end.

[0002]

2. Description of the Related Art As shown in, for example, Japanese Utility Model Publication No. 2-37015, a connecting mechanism between a thin stainless steel pipe and a joint is known. As shown in FIG. 3, the connection mechanism includes a thin stainless steel pipe 1 having an angled projection 5 formed thereon, a joint body 2 disposed at an end of the stainless steel pipe 1, and a joint having the angled projection 5 interposed therebetween. Nut 3 screwed to body 2
And The joint main body 2 has a through hole 2a into which the end of the stainless steel pipe 1 outside the angled projection 5 is inserted,
A male screw 7 is formed on the outer peripheral surface of the joint body 2. The mountain-shaped projection 5 has two inclined surfaces 5a and 5b, the nut 3 faces the joint body 2 with the mountain-shaped projection 5 interposed therebetween, and a fitting portion 8 that fits outside the stainless steel pipe 1; And a female screw portion 9 screwed to the second male screw 7. A step 6 is formed on the inner peripheral surface at the end of the joint body 2, and the packing 4 disposed in the step 6 abuts on the other inclined surface 5 b of the stainless steel pipe 1.
The step portion 6 is a flat portion 6a with which the inner side surface 4a of the packing 4 contacts.
And an inner peripheral surface 6b with which the outer peripheral surface 4b of the packing 4 abuts. A tapered portion 2 b continuous to the step 6 is formed on the inner peripheral surface at the end of the joint body 2, and the tapered portion 2 b is in close contact with the other inclined surface 5 b of the angled projection 5 of the stainless steel pipe 1.
At the inner end of the fitting portion 8 of the nut 3, an inclined notch 11 is formed which is in close contact with one of the inclined surfaces 5 a of the chevron-shaped projection 5. When the female screw portion 9 and the male screw 7 are screwed together, the packing 4 comes into close contact with the other inclined surface 5 b of the angled projection 5, the joint contact surface 10 of the nut 3, and the step portion 6. When assembling this connection mechanism, after inserting the stainless steel pipe 1 into the nut 3, a uniform force is applied from the inside of the stainless steel pipe 1 to the entire circumference to expand in the outer peripheral direction, and the angled projection 5 is attached to the stainless steel pipe 1. Form. Next, the joint main body 2 is mounted on the stainless steel pipe 1, and the male screw 7 of the joint main body 2 and the female screw portion 9 of the nut 3 are screwed together to perform assembly.

[0003]

By the way, at the time of assembling or disassembling the connection mechanism, the distal end surface 12 of the joint body 2 and the outer surface 4c of the packing 4 are exposed. In this case, packing 4
Are the inner peripheral surface 6b of the joint body 2 and the outer peripheral surface 4b of the packing 4.
Is merely held by the joint body 2 by the frictional force with
In a state where the nut 3 is removed from the joint body 2, there is a risk that the packing 4 will fall off the stepped portion 6. In addition, the dropped packing 4 may be erroneously attached in the reverse direction, thereby deteriorating the sealing performance.

[0004] Therefore, an object of the present invention is to provide a pipe joint which can prevent the packing from dropping from the joint body.

[0005]

SUMMARY OF THE INVENTION A pipe joint according to the present invention comprises:
A protrusion (2) having two inclined surfaces (25a, 25b)
5) a pipe member (21) formed on the outer periphery near the end;
A male screw (27) and a pipe member (2)
1) a joint body (22) having a through-hole (22a) into which is inserted, a female screw (29) screwed into a male screw (27) of the joint body (22), and a projection (2) of a pipe member (21).
5) The notch (3) contacting one of the inclined surfaces (25a).
1) and a nut (23) provided in a housing (26) provided on the inner periphery of the end of the joint body (22) and the other inclined surface (25b) of the projection (25) of the pipe member (21). And an annular packing (24) that comes into contact with the outer ring. A stopper portion (2) for preventing the packing (24) from moving in the axial direction.
8) is provided in the housing part (26). Stopper (2
8) has a convex part (28a) or a concave part (28b) formed in the joint body (22), and the convex part (28) of the joint body (22).
a) A concave portion (24d) or a convex portion (24c) fitted to the concave portion (28b) is formed in the packing (24). In the embodiment of the present invention, the stopper portion (28) is provided at the joint body (2).
2) It is formed on the inner side away from the distal end surface side or the distal end surface side. The stopper portion (28) is constituted by a flange-shaped convex portion (28a) projecting radially inward. The stopper portion (28) is formed continuously or intermittently in the circumferential direction. The packing (24) is provided at the protrusion (25) of the pipe member (21).
b) and the foot (21a) of the projection (25b). The stopper portion (28) has an effect of preventing the packing (24) from moving to the outside of the housing portion (26), and the packing (24) is housed even when the nut (23) is not attached to the joint body (22). It is securely held in the section (26) and does not fall out of the storage section (26).

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a pipe joint according to the present invention will be described below with reference to FIGS. As shown in FIG. 1, a pipe joint according to the present invention includes a pipe member 21 and a pipe member 21.
And a nut 23 screw-connected to the joint body 22, and a packing 24 attached to the joint body 22. Two inclined surfaces 25
A projection 25 having a and 25b is formed on the outer periphery near the end of the pipe member 21. The joint body 22 has a male screw 27 formed on the outer periphery of the end and a through hole 22 into which the pipe member 21 is inserted.
a. The nut 23 has a female screw 29 screwed into the male screw 27 of the joint main body 22 and a cutout 31 abutting on one inclined surface 25 a of the projection 25 of the pipe member 21. The annular packing 24 is disposed in a housing 26 provided on the inner periphery of the end of the joint body 22 and abuts on the other inclined surface 25 b of the projection 25 of the pipe member 21. The housing portion 26 is formed from the inner radial surface 26a with which the inner surface 24a of the packing 24 abuts, the inner peripheral surface 26b with which the outer peripheral surface 24b of the packing 24 abuts, and the distal end surface 32 or the distal end surface 32 side of the joint body 22. And a stopper portion 28 formed inside and spaced apart and locking the packing 24. The flange-like convex portion 28a that protrudes inward in the radial direction of the stopper portion 28 is
6 has a function of preventing the packing 24 from moving to the outside of the housing portion 26 apart from the housing 6, and the packing 24 is securely held in the housing portion 26 even when the nut 23 is not attached to the joint main body 22. Even when 23 is removed, there is no possibility that the packing 24 will fall out of the storage section 26.
In addition, the flange-shaped convex portion 28a is formed in an annular shape continuously in the circumferential direction, but may be formed intermittently at a constant angular interval.

[0007] In the embodiment shown in FIG.
Is formed on the end face 32 side of the joint body 22 and the joint body 2
2 has a concave portion 28b. A convex portion 24c that fits into the concave portion 28b is formed on the packing 24, and the packing 24
Of the packing 2 because the convex portion 24c of the
4 is securely held in the housing 26. In addition, accommodation section 2
6, an inclined surface 22b is formed continuously inside the inner radial surface 26a and abuts on the other inclined surface 25b. In the embodiment shown in FIG. 2, the stopper portion 28 is formed on the inner peripheral surface 26 b of the storage portion 26 so as to be separated from the distal end surface 32 side and axially inward. The gasket 24 is a convex part 2 forming the stopper part 28
8a has a concave portion 24d, and the fitting of the convex portion 28a and the concave portion 24d prevents the packing 24 from falling off. Further, the housing portion 26 and the packing 24 are extended in the axial direction, and the packing 24 is the other inclined surface 25 b of the projection 25 of the pipe member 21 and the foot portion 2 where the inclined surface 25 b is not formed.
1a. The step portion 6 of the conventional connection mechanism shown in FIG. 3 is formed by a simple step formed by the flat portion 6a and the inner peripheral surface 6b, whereas the housing portion 26 of the pipe joint shown in FIGS.
Is different in that it has a groove shape that can be fitted by elastically deforming the packing 24.

In the pipe joint shown in FIG. 1, the distal end surface 32 of the joint body 22 is separated from the opposing surface 30 of the nut 23 by a certain distance, but the distal end surface 32 contacts the opposing surface 30 of the nut 23 as shown in FIG. You may touch. In the pipe joint of FIG.
Is tightened in a state of being separated from the inner surface of the nut 23, and the joint body 22 and the nut 23 firmly contact the projection 25. However, in the pipe joint of FIG. 30 so as to prevent the nut 23 from being tightened. The annular housing portion 26 is cut at the end of the metal joint body formed by the manufacturing mold with a mill, and the external thread 27 is formed on the outer surface to manufacture the joint body 22. The present invention is not limited to the above embodiment, and can be modified. For example, the stopper portion 28 may be provided by increasing the radially inwardly projecting width of the flange-shaped convex portion 28a. Although the concave portion 28b in FIG. 1 is formed in a ring shape continuously in the circumferential direction, it may be formed intermittently at a constant angular interval. The packing 24 shown in FIG. 1 may be protruded so as to come into contact with the facing surface 30. Further, the contact portion between the packing 24 and the housing portion 26 may be formed not only in a rectangular cross-sectional shape but also in a tapered shape or other various shapes.

[0009]

According to the present invention, since there is no possibility that the packing will fall off from the joint main body, the pipe joint can be assembled without fear of losing the packing. In addition, since there is no danger of mounting the packing erroneously in the mounting direction, the packing can be reliably performed.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view showing a main part of an embodiment of a pipe joint according to the present invention.

FIG. 2 is an enlarged sectional view showing a main part of a second embodiment of the present invention.

FIG. 3 is an enlarged sectional view showing a main part of a conventional pipe joint.

[Explanation of symbols]

21. . Pipe member, 22. . Joint body, 23. . Nut, 24. . Packing, convex. . 24c, recess. . 24d, 25. . Projection, 25a, 25
b. . Slope, 26. . Receiving section, 27. . Male screw,
28. . Stopper part, convex part. . 28a, recess. . 2
8b, 29. . Internal thread, 30. . Opposing surface, 31. .
Notch, 32. . Tip surface,

Claims (5)

[Claims] 1. A joint member having a projection having two inclined surfaces formed on the outer periphery near the end, a male screw formed on the outer periphery of the end, and a joint body having a through hole into which the tube is inserted. A nut having a female thread to be screwed into the male screw of the joint body and a notch contacting one of the inclined surfaces of the protrusion of the pipe member; and a protrusion arranged on the accommodating portion provided on the inner periphery of the end of the joint body and having the protrusion A pipe joint having an annular packing abutting on the other inclined surface of the joint, a stopper portion for preventing axial movement of the packing is provided in the housing portion, and the stopper portion has a concave portion or a convex portion formed in the joint body. A pipe joint characterized in that a convex or concave portion fitted to a concave or convex portion of a joint body is formed in a packing. 2. The pipe joint according to claim 1, wherein the stopper portion is formed inside the distal end surface side of the joint main body or separated from the distal end surface side. 3. The pipe joint according to claim 1, wherein the stopper portion is constituted by a flange-shaped projection projecting radially inward. 4. The pipe joint according to claim 1, wherein the stopper is formed continuously or intermittently in a circumferential direction. 5. The pipe joint according to claim 1, wherein the packing abuts on the projection of the pipe member and the skirt of the projection.