JPH08200565A - Coupling - Google Patents

Abstract

PURPOSE: To enable connecting work for a pipe member to be easily performed by engaging the end of a sleeve to be received by a tapered contact regulating part with a recessed linear part of the pipe member through a process of deforming it inward by the approach-movement of a pair of contact regulating parts. CONSTITUTION: A pipe member 1 is inserted from a hole part 32 of a cap nut 3 to a sleeve 4 in a state the cap nut 3 is temporality fastened to a cylindrical part 22 of a coupling main body 2 until the position in the longitudinal direction of the sleeve 4 is regulated by a contact regulating part 23 of the coupling main body 2 and a contact regulating part 33 of the cap nut 3 in a state the end of the sleeve 4 to be received by the tapered contact regulating part 23 of the sleeve 4 is not deformed. When the cap nut 3 is screwed to the cylindrical part 22, the end of the sleeve 4 to be received by the tapered contact regulating part 23 is guided by the tapered contact regulating part 23 and deformed inward in the radial direction by the approach-movement of a pair of contact regulating parts 23, 33, the deformed part is engaged with the recessed linear part 1b of the pipe member 1, and the pipe member 1 is connected to a coupling T.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an end portion of a pipe member formed on an outer peripheral surface in a state where convex ridges along the circumferential direction and concave ridges along the circumferential direction are alternately arranged in the longitudinal direction. Regarding a fitting to be mounted.

[0002]

2. Description of the Related Art Conventionally, in such a joint, as shown in FIGS. 7 and 8, a joint body having a cylindrical portion 22 in which a male screw portion 21 is formed on the outer peripheral surface and the pipe member 1 is inserted inside. 2, a cap nut 3 having a hole 32 into which the pipe member 1 is inserted and a female screw portion 31 that is screwed into the male screw portion 21 of the tubular portion 22, and is externally fitted to the pipe member 1. And a sleeve 4. The sleeve 4 is formed of a material having a shape-retaining property into a halved cylindrical body shape in which a cylindrical body is bisected in the axial direction, and the inner peripheral surface of the sleeve 4 is formed. The annular protrusion 45 is formed on the outer peripheral surface of the ring, and the elongated protrusion 46 is formed on the outer peripheral surface along the axial direction. Then, the sleeve 4 is put on the outer peripheral surface of the pipe member 1 with the annular projection 45 fitted in the concave portion 1b of the pipe member 1, and the tip of the sleeve 4 is fitted in the inlet portion of the tubular portion 22 of the joint body 2. In this state, the sleeve-like nut 3 is screwed into the tubular portion 22 of the joint body 2, and the sleeve 4 is press-fitted into the tubular portion 22 in a state in which the interval between the two split tubular bodies is narrowed. 45 is engaged with the concave portion 1b to connect the pipe member 1 to the joint T in a retaining state.

[0003]

However, in the conventional joint, when the pipe member is connected to the joint, the joint is disassembled into the joint body, the bag-shaped nut, and the sleeve. As described above, there is a problem that it is necessary to connect the pipe members and the connecting work is complicated.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a joint capable of easily connecting pipe members.

[0005]

The first of the joints according to the invention
Is characterized in that a joint body having a cylindrical portion into which an external thread portion is formed on an outer peripheral surface and into which the pipe member is inserted, a hole portion into which the pipe member is inserted, and a male screw portion are screwed into the hole portion. And a cap nut having a female screw portion that is fitted onto the pipe member in an externally fitted state, one end surface of which is received and supported by the contact restricting portion of the joint body and the other end surface of which is the contact restricting portion of the cap nut. A sleeve that is received and supported by the sleeve and is regulated in position in the longitudinal direction. The end portions of the sleeve, which are formed in a tapered shape and are received by the tapered contact restricting portions, are moved by the approaching movement of the pair of contact restricting portions as the joint body and the cap nut are screwed together. , Guided by the tapered contact restriction part Deformed radially inwardly Te, in that it is adapted to be engaged in the concave portion of the tube member.

A second characteristic configuration is that the sleeve is provided with a split groove for allowing expansion and contraction in the radial direction.

In the third characteristic configuration, a concave portion and a convex portion that prevent relative rotation between the joint body and the sleeve by engaging with each other are provided separately on the joint body and the sleeve. In point.

A fourth characteristic structure is that notches are formed at a plurality of circumferential positions of an end of the sleeve which is received by the tapered contact restricting portion.

A fifth characteristic configuration is that, of the pair of contact restricting portions, only the contact restricting portion of the joint body is formed in the tapered shape.

A sixth characteristic configuration is that the joint body is provided with an annular sealing member which is in close contact with the outer peripheral surface of the pipe member inserted into the tubular portion.

A seventh characteristic configuration is that the bag-shaped nut is provided with an annular sealing member that comes into close contact with the outer peripheral surface of the pipe member inserted therein.

[0012]

The operation of the first characteristic configuration is as follows. While the end part of the sleeve that is received by the tapered contact restricting part is not deformed, until the position of the sleeve in the longitudinal direction is restricted by the contact restricting part of the joint body and the contact restricting part of the bag-shaped nut, the bag The nuts are screwed onto the cylinder of the joint body and temporarily tightened. The tube member is inserted into the sleeve from the hole of the bag-shaped nut in the temporarily tightened state. When the bag-shaped nut is further screwed into the tubular portion, the end of the sleeve, which is received by the tapered contact restricting portion, is guided to the tapered contact restricting portion by the approach movement of the pair of contact restricting portions. As a result, it is deformed inward in the radial direction and the deformed portion is engaged with the recessed portion of the pipe member, so that the pipe member can be connected to the joint in a retaining state.

The operation of the second characteristic structure is as follows. When the pipe member is inserted into the sleeve, the sleeve expands in the split groove portion as the pipe member is inserted. When the tubular nut is inserted into the sleeve and the bag-shaped nut is further screwed into the tubular portion, the diameter of the sleeve is reduced at the split groove portion and the tubular member is tightened from the outer peripheral surface thereof to prevent the tubular member from coming off.

According to the third characteristic configuration, since the concave portion and the convex portion provided separately on the tubular portion and the sleeve are engaged with each other, as the cap nut is screwed into the joint body, The sleeve and the pipe member do not rotate together.

According to the fourth characteristic configuration, since the notches are formed at a plurality of positions in the circumferential direction of the end of the sleeve which is received by the tapered contact restricting portion, the end is
The strength is weak, and it is easily deformed by being guided by the tapered contact restricting portion.

According to the fifth characteristic configuration, of the pair of contact restricting portions, only the contact restricting portion on the joint body side is formed in a tapered shape, so that the joint can be easily processed. Even if only one of the pair of contact restricting portions is tapered, forming only the contact restricting portion on the joint body side has the advantage described below. As shown in FIG. 4, the end portion of the sleeve 4 on the joint body 2 side is guided by the tapered contact restricting portion 23 of the joint body 2 to be deformed radially inward, and the deformed portion is Recess 1 of member 1
In the state of engaging with b, even if a force acts in the direction of pulling out the tube member 1, of the ridges 1a, 1a on both sides of the ridge 1b with which the deformed portion of the sleeve 4 is engaged. Since the ridge portion 1a located on the outer side of the sleeve 4 comes into contact with the end portion of the deformed portion of the sleeve 1, the retaining action of the pipe member 1 effectively acts.

By the way, in the case where only one of the pair of contact restricting portions is formed in a tapered shape, only the contact restricting portion on the bag-shaped nut side is formed in a tapered shape. There are some drawbacks. As shown in FIG. 6, the end portion of the sleeve 4 on the side of the bag-shaped nut 3 is guided by the tapered contact restricting portion 33 of the bag-shaped nut 3 to be deformed radially inward, and the deformed portion thereof. Is engaged with the grooved portion 1b of the pipe member 1, and when a force acts in the pulling-out direction of the pipe member 1, the protrusions 1a on both sides of the grooved portion 1b with which the deformed portion is engaged. , 1a, the ridge portion 1a located inside the sleeve 4 hits the inside of the deformed portion, and the ridge portion 1a spreads the deformed portion outward in the radial direction. The retaining function of the is weakened. However, FIG. 6 shows an example in which both the contact restricting portion 33 on the side of the joint body 2 and the contact restricting portion 33 on the side of the bag-shaped nut 3 are formed in a tapered shape. The retaining action when the end portion on the 3 side is deformed has been described with reference to FIG.

According to the sixth characteristic configuration, the space between the joint body and the outer peripheral surface of the pipe member inserted into the tubular portion can be sealed with an annular sealing member.

According to the seventh characteristic configuration, the bag-shaped nut and the outer peripheral surface of the pipe member inserted therein can be sealed with the annular sealing member.

[0020]

According to the first characteristic configuration, even if the manufacturer side ships the product with the joint temporarily tightened as described above, the user side is required to connect the pipe member to the joint. Even if the fitting is not disassembled into three parts, the fitting body, the bag-shaped nut, and the sleeve, the pipe member can be connected to the fitting with the fitting temporarily tightened as described above, so connection work is easy. Became. Moreover, the manufacturer side
Since the joint can be shipped as a product in the temporarily tightened state as described above, the number of parts can be reduced and the distribution cost from the manufacturer to the user can be reduced, and on the user side, Since the joint can be managed as one part, the parts management can be simplified.

According to the second characteristic construction, since the pipe member can be easily inserted into the sleeve, the connecting work of the pipe member can be further simplified, and the deformed portion of the end portion of the sleeve and the recessed portion of the pipe member can be easily connected. Since the pipe member can be prevented from coming off by the cooperation of the engagement with the above and the tightening from the outer peripheral surface of the pipe member by reducing the diameter of the sleeve, the coming-off prevention of the pipe member is further improved.

According to the third characteristic constitution, when connecting the pipe member to the joint, it is not necessary to take measures for preventing co-rotation of the pipe member, so that the connecting work of the pipe member is further simplified. It was

According to the fourth characteristic configuration, since the end portion of the sleeve which is received by the tapered contact restricting portion is easily deformed, it is necessary to tighten the cap nut when screwing it into the tubular portion. The force is small and the work of connecting the pipe members has become easier.

According to the fifth characteristic constitution, the working cost of the joint can be reduced without lowering the retaining force of the pipe member.

According to the sixth characteristic constitution, the sealing property when connecting the pipe member to the joint can be further improved.

According to the seventh characteristic configuration, it is possible to prevent moisture from entering the inside of the joint through the space between the bag-shaped nut and the outer peripheral surface of the pipe member inserted thereinto.
It has become possible to further improve the durability of the joint.

[0027]

Embodiments of the present invention will be described below with reference to FIGS. The joint T according to the present invention is provided with an annular ridge 1a extending in the circumferential direction and an annular ridge 1 extending in the circumferential direction.
It is attached to the end portion of the metallic tube member 1 which is formed on the outer peripheral surface in a state of being alternately arranged in the longitudinal direction and configured to be bendable. The outer periphery of the pipe member 1 is covered with a resinous covering material 1c, and when the pipe member 1 is connected to the joint T, the covering material 1c at the end portion inserted into the joint T is peeled off over a predetermined length.

The joint T includes a metallic joint body 2 having a male thread portion 21 formed on the outer peripheral surface thereof and a tubular portion 22 into which the pipe member 1 is inserted, and a hole portion into which the pipe member 1 is inserted. 32 and a metallic cap nut 3 having a female screw portion 31 that is screwed to the male screw portion 21, and the pipe member 1 is externally fitted to the contact portion 23 of the joint body 2. The sleeve 4 is received and supported, and the other end surface thereof is received and supported by the contact restricting portion 33 of the bag-shaped nut 3 and the position in the longitudinal direction is restricted.

Next, the joint body 2 will be described.
The tubular portion 22 is provided so that its inner hole communicates with the joint flow passage F. The contact restricting portion 23 is formed on the inner peripheral surface of the cylindrical portion 22, and the contact restricting portion 23 is formed in a taper shape in which the inner diameter gradually decreases toward the side away from the sleeve 4.
An annular groove 25 is formed on the innermost surface of the innermost portion of the tubular portion 22, and the annular groove 25 has an annular shape that is in close contact with the outer circumferential surface of the pipe member 1 inserted into the tubular portion 22. O as a sealing member
The ring 5 is fitted. Further, at the end of the tubular portion 22, a recess 24 that engages with a protrusion 44 of the sleeve 4 described later is provided.
Are formed at two locations.

Next, the bag-shaped nut 3 will be described. The contact restricting portion 33 is formed on an end surface orthogonal to the axial direction of the bag nut 3. A large-diameter portion 34 having an inner diameter larger than that of the inner side in the axial direction is formed on the outer side in the axial direction on the inner peripheral surface of the hole portion 32. When the tubular member 1 is inserted, the large-diameter portion 34 is formed. The first covering material 1c is fitted into the large-diameter portion 34. Further, an annular groove 35 is formed on the inner peripheral surface of the large diameter portion 34 of the hole 32, and the annular groove 35 has
Outer peripheral surface of the pipe member 1 inserted into the bag-shaped nut 3 (coating material 1
A waterproof packing 6 as an annular sealing member that is in close contact with c) is fitted.

Next, the sleeve 4 will be described.
The end of the sleeve 4 that is received by the tapered contact restricting portion 23 of the sleeve 4 is moved by the approaching movement of the pair of contact restricting portions 23 and 33 as the cap nut 3 and the joint body 2 are screwed together. , And is formed of a material (for example, copper) that is guided by the tapered contact restriction portion 23 and deforms inward in the radial direction. The sleeve 4 is formed in a split cylinder shape in which a split groove 41 for allowing expansion and contraction in the radial direction is formed. Further, the end portion of the sleeve 4 that is received by the tapered contact restricting portion 23 (that is, the joint body 2
By forming the cutouts 42 at a plurality of circumferential positions of the side end portion), the cut-out portions 43 are formed at a plurality of circumferential positions of the end portion.
Are formed so as to be easily deformed by being guided by the tapered contact restricting portion 23. Further, the outer peripheral surface of the sleeve 4 is formed with two convex portions 44 to be engaged with the concave portions 24 of the joint main body. The length of the recess 24 in the axial direction is made longer than the length of the projection 44 in the axial direction so that the recess 24 and the projection 4 can be screwed together when the cap nut 3 and the joint body 2 are screwed together.
The relative movement with respect to 4 is allowed.

Next, the procedure for connecting the pipe member 1 to the joint T constructed as described above will be described. The joint T is supplied from the manufacturer in the temporarily tightened state as shown in FIG.
In a state in which the end portion of the sleeve 4 which is received by the tapered contact restricting portion 23 is not deformed, the contact restricting portion 23 of the joint body 1 and the contact restricting portion 33 of the cap nut 3 are arranged in the longitudinal direction of the sleeve 4. Cap nut 3 until the position is regulated
Is shipped in a state of being screwed into the tubular portion 22 of the joint body 2.

An operator who connects the pipe member 1 to the joint T peels off the covering material 1c at the end portion of the pipe member 1 to be inserted into the joint T over a predetermined length, and then, as shown in FIG. 1
Is inserted from the hole 32 of the bag-shaped nut 3 to the sleeve 4, and the tip of the pipe member 1 is applied to the O-ring 5.

As shown in FIG. 4, the bag-shaped nut 3 is attached to the tubular portion 2.
When it is further screwed into 2, the end section 43 of the sleeve 4 that is received by the tapered contact restricting portion 23 by the approach movement of the pair of contact restricting portions 23, 33 is tapered contact restricting portion. It is guided by 23 and deforms inward in the radial direction, and the deformed portion is engaged with the recessed portion 1b of the pipe member 1, and the pipe member 1 is connected to the joint T in a retaining state. At the same time, the O-ring 5 is brought into close contact with the outer peripheral surface of the pipe member 1, and the pipe member 1 is reliably sealed and connected to the joint flow passage F of the joint T. Further, the waterproof packing 6 is brought into close contact with the outer peripheral surface of the covering material 1c of the pipe member 1 to prevent water from entering the joint T.

Another Embodiment Next, another embodiment will be described. In the above embodiment, of the contact restricting portion 23 of the joint body 2 and the contact restricting portion 33 of the bag-shaped nut 3, only the contact restricting portion 23 of the joint body 2 is formed in a tapered shape. Instead of this, as shown in FIG. 6, the contact restricting portion 33 of the bag-shaped nut 3 may also be formed in a taper shape in which the inner diameter gradually decreases toward the side away from the sleeve 4. in this case,
As shown in FIG. 5, notches 42 are formed at a plurality of circumferential positions of an end portion of the sleeve 4 which is received by the tapered contact restricting portion 33 of the bag-shaped nut 3, so that the circumferential direction of the end portion is reduced. It is preferable to form the cut portions 43 at a plurality of locations. In this case, as shown in FIG. 6, the pair of tapered contact restricting portions 23, 3 are provided at the end portions 43 of the sleeve 4 as the cap nut 3 and the joint body 2 are screwed together.
By the approaching movement of 3, the guides are deformed inward in the radial direction to be engaged with the concave streak portion 1b of the pipe member 1,
The retaining action of the pipe member 1 is further improved.

The split groove 41 may not be formed in the sleeve 4. Moreover, the notch 43 may not be formed.

In order to separately provide the joint body 2 and the sleeve 4 with a concave portion and a convex portion that prevent the relative rotation of the joint main body 2 and the sleeve 4 by engaging with each other, in the above embodiment, the convex portion 44 is provided. The case where the concave portion 24 is formed on the sleeve 4 and the concave portion 24 that engages with the convex portion 44 is formed on the joint main body 2, but instead, the convex portion is formed on the joint main body 2 and the convex portion is formed. You may form the convex part which engages with a part in the sleeve 4.

By performing processing such as thinning the base portion of the segment portion 43 to form a fragile portion, the segment portion 43
Is guided to the tapered contact restricting portion 23 by the approaching movement of the pair of contact restricting portions 23, 33 accompanying the screwing of the bag-shaped nut 3 and the joint body 2, and is deformed inward in the radial direction. You may comprise so that it may be easy.

Incidentally, reference numerals are written in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a joint according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of the joint.

FIG. 3 is a vertical sectional view of the joint.

FIG. 4 is a vertical sectional view of the joint.

FIG. 5 is an exploded perspective view of a joint according to another embodiment.

FIG. 6 is a vertical sectional view of a joint according to another embodiment.

FIG. 7 is an exploded perspective view of a conventional joint.

FIG. 8 is a vertical sectional view of a conventional joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe member 2 Joint main body 3 Cap nut 4 Sleeve 5,6 Sealing member 21 Male screw part 22 Cylindrical part 23, 33 Contact regulation part 24 Recessed part 31 Female screw part 32 Hole part 41 Split groove 42 Notch part 44 Convex part 1a convex stripe 1b concave stripe

Claims (7)

[Claims] 1. A pipe member (1) formed on an outer peripheral surface in a state where convex ridges (1a) along the circumferential direction and concave ridges (1b) along the circumferential direction are alternately arranged in the longitudinal direction. A joint body (2) which is a joint to be attached to an end portion, and which has a male thread portion (21) formed on an outer peripheral surface and a tubular portion (22) into which the pipe member (1) is inserted, A bag-shaped nut (3) having a hole (32) into which the pipe member (1) is inserted and a female screw part (31) screwed into the male screw part (21), and the pipe member (1) ), The one end surface of which is received and supported by the contact restricting portion (23) of the joint body (2) and the other end surface of which is the contact restricting portion (33) of the cap nut (3).
And a sleeve (4) which is received and supported by the sleeve (4) and whose position in the longitudinal direction is restricted. The contact restricting part (23) of the joint body (2) or the contact restricting part of the cap nut (3). (33) is the sleeve (4)
The inner diameter of the sleeve (4) is gradually reduced toward the side away from the joint body (2), and the end of the sleeve (4) is received by the tapered contact restricting portion (23).
By the approaching movement of the pair of abutment restricting portions (23) and (33) accompanying the screwing of the cap and the bag-shaped nut (3), the taper abutment restricting portion (23) is guided to the radial direction. A joint configured to be deformed inward and to be engaged with the groove (1b) of the pipe member (1). 2. The joint according to claim 1, wherein the sleeve (4) is formed with a split groove (41) for allowing radial expansion and contraction. 3. A recess (24) and a protrusion (44) for preventing relative rotation between the joint body (2) and the sleeve (4) by engaging each other, the joint body (2).
3. The joint according to claim 1, wherein the sleeve and the sleeve are provided separately. 4. A notch (42) is formed at a plurality of circumferential positions of an end of the sleeve (4) that is received by the tapered contact restricting portion (23). The joint according to 3. 5. The pair of contact restricting portions (23), (3)
3) Of the joint body (2), the contact regulating portion (2)
The joint according to claim 1, 2, 3 or 4, wherein only 3) is formed in the tapered shape. 6. The tubular body (2) is attached to the joint body (2).
An annular sealing member (5) which is in close contact with the outer peripheral surface of the pipe member (1) inserted in 2) is provided.
The joint according to 3, 4, or 5. 7. The bag-shaped nut (3) is provided with an annular sealing member (6) which is in close contact with the outer peripheral surface of the pipe member (1) inserted therein. The joint according to 4, 5, or 6.