JP2011220453A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint enabling the rotation of a pipe to be connected after connecting to a nozzle by caulking a sleeve.SOLUTION: The pipe joint has a joint body 2 having the nozzle 1 on one end side, a turning member 3 installed on the outer periphery of the nozzle 1, turnable in the peripheral direction relative to the outer periphery, and restricting the nozzle 1 from moving in an axial direction, and the sleeve 4 arranged so as to surround the turning member 3 and is constituted such that the pipe H to be connected is sandwiched by the sleeve 4 and the turning member 3 in a freely turnable condition to the nozzle 1 when the sleeve 4 is caulked with the pipe to be connected inserted between the turning member 3 and the sleeve 4.

Description

  The present invention relates to a pipe joint used for connecting various pipes such as a water supply pipe and a hot water supply pipe.

  As a conventional pipe joint, by inserting a pipe to be connected between a nozzle part (also called a nipple) of a joint body and a sleeve arranged outside the nozzle part, the sleeve is caulked by a caulking tool. There is a caulking joint for connecting the pipe to be connected to the nozzle portion (see, for example, Patent Document 1).

JP 2007-285405 A

  In the conventional caulking joint, the connected pipe in a state connected to the nozzle portion cannot be rotated relative to the nozzle portion, so that the workability is poor.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a pipe joint that enables rotation of a connected pipe after a sleeve is crimped and connected to a nozzle portion.

In order to achieve the above object, a pipe joint according to the present invention includes a joint body having a nozzle portion on one end side,
A rotating member that is mounted on the outer peripheral surface of the nozzle portion, is rotatable in the circumferential direction with respect to the outer peripheral surface, and is restricted from moving in the axial direction of the nozzle portion;
A sleeve arranged to surround the rotating member;
When the sleeve is caulked with the connected pipe inserted between the rotating member and the sleeve, the connected pipe is rotatable with respect to the nozzle portion in a state where the connected pipe is rotatable. It is comprised so that it may be clamped with a moving member (Claim 1).

  In the pipe joint, a protrusion for preventing the connected pipe from coming off may be provided on the outer peripheral surface of the rotating member.

The pipe joint includes an insertion guide member that is slidably fitted to the nozzle portion in a state in which the rotating member is mounted and has elasticity.
The connected pipe may be configured to pass outside of the rotating member while pressing the insertion guide member when being fitted to the nozzle portion in a state where the rotating member is mounted. (Claim 3)

  In the invention which concerns on Claims 1-3, the pipe joint which enables rotation of the to-be-connected pipe | tube after crimping a sleeve and connecting to a nozzle part is obtained. And this pipe joint contributes to the improvement of workability, because the pipe to be connected can be rotated relative to the nozzle portion.

  In the invention according to claim 2, when the sleeve is caulked, a sufficient retaining effect (caulking effect) can be obtained by the retaining projection of the connected pipe.

  Further, in the invention according to claim 3, when the connected pipe is fitted on the nozzle portion in a state where the rotating member is mounted, the insertion guide member advances before the connected pipe, and the insertion guide member The rotating member can be pressed in the diameter reducing direction. Accordingly, the connected pipe passes through the outside of the rotating member having a reduced diameter, and the insertion guide member has elasticity, so that the rotating member is damaged by the insertion guide member and the connected pipe. It is prevented from sticking. At this time, even if the distal end surface of the tube to be connected is not completely perpendicular to the tube axis and is slightly inclined, the insertion guide member having elasticity pushed by the tube to be connected is not connected. Since it deforms so as to be in close contact with the distal end surface of the tube, there is almost no gap between the distal end surface of the connected tube and the insertion guide member. In addition, when the connected pipe is a three-layer pipe having a metal layer (for example, an aluminum layer), the metal layer exposed on the distal end side of the connected pipe comes into contact with a joint body made of metal and corrosion occurs. This is also prevented by the insertion of an insertion guide member which can be made of non-metal.

(A)-(d) is explanatory drawing which shows roughly the connection method of the pipe joint which concerns on the 1st Embodiment of this invention. (A)-(c) is the front view, longitudinal cross-sectional view, and perspective view which show schematically the structure of the rotation member of the said pipe joint. It is a longitudinal cross-sectional view which shows the structure of the insertion guide member of the said pipe joint roughly. (A) And (b) is explanatory drawing which expands and shows roughly the principal part of the said pipe joint before a connection and after a connection. It is explanatory drawing which shows roughly the force applied to the said pipe joint after a connection. (A) is a semi-longitudinal side view schematically showing a configuration of a pipe joint according to a second embodiment of the present invention, and (b) is a longitudinal section schematically showing a configuration of an insertion guide member of the pipe joint. FIG. (A)-(c) is the front view, longitudinal cross-sectional view, and perspective view which show schematically the structure of the rotation member of the pipe joint which concerns on 2nd Embodiment. It is a half vertical side view which shows roughly the structure of the pipe joint which concerns on the 3rd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  As shown in FIGS. 1A to 1D, the pipe joint according to the first embodiment has a substantially cylindrical joint body 2 having a nozzle portion 1 on one end side, and an outer peripheral surface of the nozzle portion 1. A rotating member 3 (see also FIGS. 2A to 2C) that is mounted and rotatable in the circumferential direction with respect to the outer peripheral surface, and in which movement of the nozzle portion 1 in the axial direction is restricted. The sleeve 4 arranged so as to surround the rotating member 3 and the outer peripheral surface of the nozzle portion 1 are attached to an annular groove 5 provided on the distal end side of the nozzle portion 1 with respect to the rotating member 3, A substantially ring-shaped insertion guide member 7 (FIG. 3) that is slidably fitted to the nozzle portion 1 in a state where the seal member 6 (for example, an O-ring) 6 that is in close contact with the inner peripheral surface of H and the rotating member 3 is mounted. See also).

  Next, the connection method of the pipe H to be connected by the pipe joint will be described with reference to a more specific configuration of the pipe joint.

  (1) First, as shown in FIG. 1A, the rotating member 3 is mounted on the nozzle portion 1 of the joint body 2, the seal member 6 is mounted on the annular groove 5, and the insertion guide is provided outside the seal member 6. It is assumed that the member 7 is arranged and the sleeve 4 is arranged so as to surround the nozzle portion 1 in this state. As a result, the connected pipe H can be connected.

  Here, as shown in FIG. 1A, two annular recesses 8 are provided on the outer peripheral surface of the nozzle portion 1, and the rotating member 3 is attached to each annular recess 8. The rotating member 3 is, for example, a split ring configured as shown in FIGS. 2A to 2C (a ring-shaped member in which one place in the circumferential direction is divided over the entire length in the length direction). In the illustrated example, there are three annular projections 3a on the outer peripheral surface. And such a rotation member 3 can be shape | molded, for example with synthetic resins, such as POM, However, A metal press may be sufficient.

  Further, as shown in FIG. 4A, the insertion guide member 7 is externally fitted to the nozzle portion 1 with a gap formed between the outer peripheral surface of the insertion guide member 7 and the inner peripheral surface of the sleeve 4. The insertion guide member 7 can smoothly slide on the outside of the nozzle portion 1 due to the clearance. In the present embodiment, the inner diameter of the sleeve 4 is 16.4 mm, and the outer diameter of the insertion guide member 7 is 16.2 mm.

  (2) After the pipe joint is brought into a state in which the connection pipe H can be connected as described above, the connection pipe H is inserted between the nozzle portion 1 and the sleeve 4. At this time, the tip of the tube to be connected H abuts against the insertion guide member 7, and the tube to be connected H passes the outside of the seal member 6 and the two rotating members 3 while pushing the insertion guide member 7, and eventually FIG. It will be in the state inserted even to the position shown in b). Note that whether or not the connected pipe H has been inserted to the position shown in FIG. 1B can be confirmed through the through hole h provided in the sleeve 4.

  Here, the outer peripheral surface tip portion 1a of the nozzle portion 1 and the inner peripheral surface tip portion 4a of the sleeve 4 are respectively connected so that the operation of inserting the connected pipe H between the nozzle portion 1 and the sleeve 4 can be performed smoothly. They are tapered in opposite directions (see FIG. 1A).

  Further, when the connected pipe H is fitted on the nozzle portion 1 in a state where the rotating member 3 is mounted, the connected pipe H advances while pushing the insertion guide member 7, and the seal member 6 is moved by the insertion guide member 7. And the two rotation members 3 are pressed by the diameter reduction direction. That is, the taper portion 7a (see FIGS. 3 and 4A) provided on the distal end side of the inner peripheral surface of the insertion guide member 7 prevents the seal member 6 from being detached from the annular groove 5, and the insertion guide member 7 The sealing member (O-ring) 6 is reliably secured by a straight portion 7b (see FIGS. 3 and 4A) having an inner diameter substantially the same as the inner diameter of the pipe H to be connected, provided on the rear end side of the inner peripheral surface. The diameter can be smoothly reduced with the assistance of a tapered portion 7c (see FIGS. 3 and 4A) provided at a position closer to the tip than the straight portion 7b. .

  Similarly, the insertion guide member 7 also presses the two rotating members 3 in the direction of diameter reduction. Since the rotating member 3 is attached to the nozzle portion 1 so that the diameter of the rotating member 3 can be reduced, the connected pipe H passes outside the rotating member 3 in a reduced diameter state, and the insertion guide member 7 is further moved. Since the non-metallic material (for example, rubber such as NBR) is molded so as to have elasticity, the rotating member 3 (annular protrusion 3a) is damaged by the insertion guide member 7 or the connected pipe H. Is prevented. Further, the insertion guide member 7 having elasticity pressed against the connected pipe H even if the distal end surface of the connected pipe H is not completely perpendicular to the pipe axis and is slightly inclined or uneven. Is deformed so as to be in close contact with the distal end surface of the connected pipe H, and the insertion guide member 7 has a gap between the outer peripheral surface of the insertion guide member 7 and the inner peripheral surface of the sleeve 4 as described above. Since it can be largely deformed, there is almost no gap between the distal end surface of the connected pipe H and the insertion guide member 7.

  Further, when the pipe to be connected H is inserted to the position shown in FIG. 1B, the insertion guide member 7 is configured to face the concave groove 1 b provided on the outer peripheral surface of the nozzle portion 1. . For example, when the connected pipe H is a three-layer pipe having a metal layer, the metal layer exposed on the distal end side of the connected pipe H comes into contact with the joint body 2 that is also made of metal, and corrosion occurs. This is prevented by the insertion of the non-metallic insertion guide member 7 that fits in the concave groove 1b.

  (3) After the connected pipe H is inserted between the rotating member 3 and the sleeve 4 as described above, the sleeve 4 is caulked by the caulking tool 9, thereby completing the connection of the connected pipe H. (See FIGS. 1A and 1B).

  Here, on the inner peripheral surface of the caulking tool 9, there are provided three ridges 9a facing the two annular recesses 8 and the groove 1b, and when the sleeve 4 is caulked, the connected pipe H becomes the sleeve 4 And the rotating member 3. The rotating member 3 positioned on the inner peripheral side of the connected pipe H is mounted in the annular recess 8 and can rotate in the circumferential direction with respect to the outer peripheral surface of the nozzle portion 1. Movement of the portion 1 in the axial direction is restricted. Further, since the rear end portion 4b of the sleeve 4 positioned on the outer peripheral side of the connected pipe H is bent inward and is locked to the annular protrusion 1c of the nozzle portion 1, the sleeve 4 is also the outer peripheral surface of the nozzle portion 1. However, the movement of the nozzle portion 1 in the axial direction is restricted.

  Therefore, the connected pipe H sandwiched between the rotating member 3 and the sleeve 4 is also rotatable with respect to the nozzle portion 1 and the movement of the nozzle portion 1 in the axial direction is restricted. It becomes.

  And since the protrusion (annular protrusion) 3a for preventing the to-be-connected pipe H from coming off is provided on the outer peripheral surface of the rotating member 3, when the sleeve 4 is caulked, a sufficient retaining effect (caulking effect) is obtained. Is obtained. In addition, since the insertion guide member 7 has elasticity, even if it crimps the sleeve 4, it will not be destroyed (refer FIG.4 (b)).

  Further, as shown in FIG. 5, when an external force F acting in the direction of pulling out the connected pipe H from the nozzle portion 1 is applied, each rotating member 3 that sandwiches the connected pipe H with the sleeve 4 has an annular recess 8. Therefore, the external force F is dispersed into two forces f1 and f2 at which the two rotating members 3 abut against the wall surface 8a. Therefore, in the present embodiment in which the rotating member 3 and the annular recess 8 are provided two by two, the force applied to each rotating member 3 is reduced, so that the consumption of each rotating member 3 can be suppressed accordingly, and the pipe joint It is also possible to improve the durability.

  Here, the connected pipe H only needs to have a configuration that can be connected by the above-described method. For example, a synthetic resin (polyethylene, cross-linked) is sandwiched between intermediate layers made of metal (light metal such as aluminum or stainless steel). It may be a pipe (three-layer pipe) provided with a layer made of polyethylene, polybutene, polypropylene, vinyl chloride, or a single-layer pipe made of polyolefin resin (polyethylene, crosslinked polyethylene, polybutene, etc.) Also good.

  In addition, this invention is not limited to said embodiment at all, Of course, it can change and implement variously in the range which does not deviate from the summary of this invention. For example, the following modifications can be given.

  The number of the protrusions 3a for preventing the connection pipe H provided on the rotating member 3 is not limited to three, and may be two or less or four or more.

  The number of the rotation members 3 and the annular recesses 8 is not limited to two, but may be one or three or more.

  When the connected pipe H is externally fitted to the nozzle portion 1 with the rotating member 3 attached, the sleeve 4 surrounds the rotating member 3 (the nozzle portion 1 with the rotating member 3 attached). The sleeve 4 may be externally fitted to the outside of the connected pipe H instead of being arranged as described above.

  When the connected pipe H is externally fitted to the nozzle portion 1 in a state where the rotating member 3 is mounted, the insertion guide member 7 is not on the outside of the seal member 6 but on the front end side of the nozzle portion 1 with respect to the seal member 6. (The left side in FIG. 1A) may be arranged.

  In the above-described embodiment, the rear end portion 4b of the sleeve 4 is bent inward and is engaged with the annular protrusion 1c of the nozzle portion 1 to directly restrict the sleeve 4 from moving in the axial direction of the nozzle portion 1. However, for example, the sleeve 4 may be configured not to be locked to the nozzle portion 1 without bending the rear end portion 4b. Even in this case, the sleeve 4 is caulked and fixed to the rotating member 3 via the connected pipe H, and the rotating member 3 is restricted from moving in the axial direction of the nozzle portion 1. The movement of the nozzle portion 1 in the axial direction is indirectly restricted.

  And it cannot be overemphasized that the said modification may be combined suitably.

  Hereinafter, a pipe joint according to a second embodiment of the present invention will be described. Here, FIG. 6 (a) is a half vertical sectional view schematically showing the configuration of the pipe joint according to the second embodiment of the present invention (longitudinal sectional view of the upper half of the pipe joint and the connected pipe H, (The figure which shows a lower half as a side view, respectively).

  First, in the pipe joint of the second embodiment, instead of the rotating member 3 of the first embodiment, a rotating member 3 'obtained by adding the following changes to the rotating member 3 is used. That is, on the inner peripheral surface of the rotating member 3 ′, as shown in FIGS. 7A to 7C, a substantially bowl-shaped protrusion 3b extending in the length direction of the rotating member 3 ′ is provided in the circumferential direction. A plurality are provided at intervals. Thereby, when the rotating member 3 ′ mounted on the annular recess 8 rotates, the frictional resistance generated between the rotating member 3 ′ and the annular recess 8 is reduced, so that the rotating member 3 ′ is rotated. It is easier to rotate than the moving member 3. Further, the rotating member 3 has three annular protrusions 3a, but there are two annular protrusions 3a of the rotating member 3 '.

  Further, in the pipe joint of the second embodiment, instead of the insertion guide member 7 of the first embodiment, an insertion guide member 7 ′ in which the following changes are made to the insertion guide member 7 is used. That is, as shown in FIG. 6B, the insertion guide member 7 ′ has a symmetrical structure (the shape from the central portion to the front end side and the shape from the central portion to the rear end side are the same). Structure), and a taper portion 7a and a taper portion 7c are provided on the inner peripheral surface of the insertion guide member 7 'from the front end side and the rear end side toward the center, respectively, and between the two taper portions 7c. A straight portion 7b is provided. Therefore, the insertion guide member 7 ′ always has a function of pressing the seal member 6 and the two rotating members 3 in the diameter-reducing direction regardless of which front or rear of the insertion guide member 7 ′ is facing forward. As a result, it is possible to reliably eliminate assembly errors that may occur in the insertion guide member 7 having an asymmetric structure before and after the first embodiment, and to improve the assembly workability. .

  Further, in the first embodiment, the rear end portion 4b of the sleeve 4 bent inward is directly locked to the annular protrusion 1c of the nozzle portion 1 to restrict the sleeve 4 from moving in the axial direction of the nozzle portion 1. However, in the pipe joint of the second embodiment, as shown in FIG. 6A, the annular protrusion 1c of the nozzle portion 1 is made of a synthetic resin (for example, POM) and has a substantially annular connection member 10. The rear end portion 4b of the sleeve 4 is locked to the annular recess 10a provided in the connecting member 10. That is, in the second embodiment, the rear end portion 4 b of the sleeve 4 is indirectly locked to the annular protrusion 1 c of the nozzle portion 1 via the connecting member 10, and the sleeve 4 is the shaft of the nozzle portion 1. The point that the movement in the direction is restricted is the same as in the first embodiment.

  Other configurations are the same as those of the first embodiment, and common constituent elements are denoted by the same reference numerals and description thereof is omitted. Here, when connecting the to-be-connected pipe H to the pipe joint according to the second embodiment, the steps corresponding to the steps shown in FIGS. 1A to 1D of the first embodiment are sequentially performed. Needless to say.

  In the second embodiment, as described above, the substantially hook-shaped protruding portion 3b is provided on the inner peripheral surface of the rotating member 3 ′. The protruding portion 3b is connected to the rotating member 3 ′. What is necessary is just to exhibit the friction reduction function which reduces the frictional resistance produced between the annular recessed parts 8 (or the function which makes rotation member 3 'attached to the annular recessed part 8 easy to rotate), for example, a hemisphere or a mountain A shape other than a substantially bowl-like shape may be used, and furthermore, such a protruding portion 3b is provided on the outer peripheral surface (bottom surface) of the annular recess 8 instead of being provided on the inner peripheral surface of the rotating member 3 ′. Also good.

  Hereinafter, a pipe joint according to a third embodiment of the present invention will be described. Here, FIG. 8 is a half vertical side view schematically showing the configuration of the pipe joint according to the third embodiment of the present invention (the upper half of the pipe joint is shown as a longitudinal sectional view, and the lower half is shown as a side view). Figure).

  In the pipe joint according to the third embodiment, instead of the rotation member 3 according to the first embodiment, a rotation member 3 ″ obtained by adding the following changes to the rotation member 3 is used. That is, as shown in FIG. 8, the rotating member 3 ″ is shorter than the rotating member 3 (for example, a length corresponding to one of the three annular protrusions 3a of the rotating member 3). In addition, when the sleeve 4 is caulked, the entire outer peripheral portion of the rotating member 3 ″ is configured to obtain a retaining effect (caulking effect) equivalent to that of the one annular protrusion 3a. In addition, although the two rotation members 3 of the first embodiment are provided, a total of three rotation members 3 ″ are provided. In addition, each annular recess 8 to which the rotating member 3 ″ is attached is also formed to be narrow in accordance with the length of the rotating member 3 ″.

  Further, in the first embodiment, the rear end portion 4b of the sleeve 4 bent inward is directly locked to the annular protrusion 1c of the nozzle portion 1 to restrict the sleeve 4 from moving in the axial direction of the nozzle portion 1. However, in the pipe joint of the third embodiment, as shown in FIG. 8, an O-ring 11 made of rubber (for example, NBR) is engaged with the annular protrusion 1 c of the nozzle portion 1, and this O-ring 11, the rear end 4b of the sleeve 4 is locked. That is, in the third embodiment, the rear end portion 4 b of the sleeve 4 is indirectly locked to the annular protrusion 1 c of the nozzle portion 1 via the O-ring 11, and the sleeve 4 is in the axial direction of the nozzle portion 1. This is the same as the first embodiment in that the movement is restricted.

  Other configurations are the same as those of the first embodiment, and common constituent elements are denoted by the same reference numerals and description thereof is omitted. Here, when connecting the to-be-connected pipe H to the pipe joint according to the third embodiment, the steps corresponding to the steps shown in FIGS. 1A to 1D of the first embodiment are sequentially performed. Needless to say.

  For example, the insertion guide member 7 ′ in the second embodiment may be used in place of the insertion guide member 7 in the first and third embodiments, and as described above, Needless to say, the configuration and its modifications may be combined as appropriate.

DESCRIPTION OF SYMBOLS 1 Nozzle part 2 Joint main body 3 Rotating member 4 Sleeve 5 Annular groove 6 Seal member 7 Insertion guide member H Connected pipe

Claims (3)

A joint body having a nozzle portion on one end side;
A rotating member that is mounted on the outer peripheral surface of the nozzle portion, is rotatable in the circumferential direction with respect to the outer peripheral surface, and is restricted from moving in the axial direction of the nozzle portion;
A sleeve arranged to surround the rotating member;
When the sleeve is caulked with the connected pipe inserted between the rotating member and the sleeve, the connected pipe is rotatable with respect to the nozzle portion in a state where the connected pipe is rotatable. A pipe joint configured to be clamped by a moving member.   The pipe joint according to claim 1, wherein a protrusion for preventing the connected pipe from coming off is provided on an outer peripheral surface of the rotating member. An insertion guide member that is slidably fitted to the nozzle portion in a state in which the rotating member is mounted and has elasticity;
The connected pipe is configured to pass outside of the rotating member while pressing the insertion guide member when the connecting pipe is externally fitted to the nozzle portion in a state where the rotating member is mounted. Item 3. The pipe joint according to Item 1 or 2.

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