JP2009127811A - Protecting fitting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively prevent the occurrence of crack in a joint cap and prevent the enlargement of the crack when occurring in the joint cap. <P>SOLUTION: This cylindrical protecting fitting 10 which encircles the joint cap is split into a first split fitting 11 and a second split fitting 12 along the peripheral direction. Both split fittings 11, 12 have one peripheral ends 11a, 12a to be moved closer to or apart from each other with the other peripheral ends 11b, 12b connected to each other rotatably around a rotational axis L parallel to a center axis O of the protecting fitting 10. One peripheral ends 11a, 12a are separatively fixed to each other in a mutually abutting condition with a fastening member closely contacting them in an abutting direction A. The protecting fitting 10 has an inner diameter Y in a perpendicular direction B perpendicular to the abutting direction A similar to the outer diameter of the joint cap and smaller than an inner diameter X in a direction parallel to the abutting direction A. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cylindrical protective metal fitting surrounding a coupling cap formed in a cylindrical shape.

In recent years, for example, joint caps are often used for water supply pipes, hot water supply pipes, and the like. In this type of joint cap, there was a risk of cracking due to, for example, fluid pressure in the pipe.
Japanese Patent Laid-Open No. 4-119290

Therefore, as means for solving such a problem, for example, increasing the thickness of the joint cap or providing a reinforcing material inside the joint cap is known. It has not reached the point where it can be effectively prevented.
In addition, when a crack occurs in the joint cap, not only does fluid leak from the crack, but also the rigidity decreases, so that the crack is further enlarged, and the joint cap must be replaced quickly.

  The present invention has been made in consideration of such circumstances, and can effectively prevent the joint cap from cracking and prevent the joint cap from expanding even if the joint cap cracks. An object of the present invention is to provide a protective metal fitting that can be used.

In order to solve the above-described problems and achieve such an object, the protective metal fitting of the present invention is a cylindrical protective metal fitting that surrounds a coupling cap formed in a cylindrical shape, and is provided along the circumferential direction thereof. It is divided into a first divided metal fitting and a second divided metal fitting, and in both of these divided metal fittings, the other peripheral edges are parallel to the central axis of the protective metal fitting so that the one peripheral edges are close to each other. In addition to being rotatably connected around the rotation axis, the one peripheral end portions are fixed in a separable manner by being brought into close contact with each other by a fastening member in a state of being abutted against each other. The inner diameter in the orthogonal direction orthogonal to the butting direction is equal to the outer diameter of the joint cap and smaller than the inner diameter in the direction parallel to the butting direction. To.
In this invention, in a state where one peripheral end portion is separated from each other, after disposing a joint cap between the two divided metal fittings, the two divided metal fittings are relatively rotated around the rotation axis, The protective metal fittings are attached to the joint cap by bringing the peripheral edge parts into contact with each other and then bringing one of the peripheral edge parts into close contact with each other in the abutting direction with a fastening member, and the joint cap is surrounded by the protective metal fittings. become.
At this time, since the inner diameter of the protective metal fitting in the orthogonal direction is equal to the outer diameter of the joint cap, the joint cap is supported by the inner peripheral surface of the protective metal fitting from the outside in the radial direction. It is possible to suppress the deformation amount of the joint cap due to the action of the fluid pressure, and it is possible to prevent the joint cap from cracking.
In addition, when a crack occurs in the joint cap, the deformation of the joint cap due to the fluid pressure in the piping can be suppressed by attaching a protective fitting to the joint cap as soon as possible. Since the inner diameter in the orthogonal direction of the protective metal fitting is equal to the outer diameter of the joint cap, the inner circumference of the protective metal fitting By abutting the portion having the inner diameter in the orthogonal direction on the surface, it becomes possible to close the opening of the crack, and it is also possible to suppress the leakage of fluid from the crack. Further, it is possible to prevent the gap between the water stop member such as an O-ring provided on the inner side of the attachment portion to which the joint cap is attached in the joint body and the inner surface of the attachment portion from being enlarged.
Further, the inner diameter of the protective metal fitting is not equal to the outer diameter of the joint cap over the entire circumference, but as described above, the inner diameter of the protective metal fitting in the orthogonal direction perpendicular to the abutting direction is Since it is the same as the outer diameter and smaller than the inner diameter in the direction parallel to the butting direction, it acts on the joint cap even if the fastening means is tightened excessively when the protective fitting is attached to the joint cap. It is possible to suppress the tightening force, and it is possible to prevent the joint cap from cracking or from being easily cracked when fluid pressure in the pipe is applied. Thereby, when attaching a protective metal fitting to a coupling cap, it becomes possible to save the effort which adjusts the fastening force by the said fastening means, and this protective metal fitting can be attached easily.

Here, a plurality of tongue portions that protrude inward in the radial direction and that can clamp the joint cap in the axial direction are formed at both ends in the central axial direction of the protective metal fitting at intervals in the circumferential direction. May be.
In this case, since the tongue is formed on the protective metal fitting, when the protective metal fitting is attached to the joint cap, the time required for positioning the protective metal fitting relative to the joint cap in the central axis direction is increased. In addition to being able to suppress, it is possible to prevent the protective metal fitting from being detached from the joint cap or being displaced due to, for example, an external force acting unexpectedly after the protective metal fitting is attached to the joint cap.
In addition, the tongue is not continuously extended over the entire circumference of the protective metal fitting, but is formed in a plurality at intervals in the circumferential direction. For example, the tongue portion branches close to the joint cap to which the protective metal fitting is attached. In the case where a pipe is provided, the non-formed portion of the tongue portion of the end edge in the central axis direction of the protective fitting is brought close to the branch pipe from the outside in the radial direction, and the protective fitting is connected to the joint. By attaching to the cap, it is possible to avoid interference between the branch pipe and the tongue, and the protective metal fitting can be easily attached to the joint cap. Furthermore, since the boundary portion between the joint cap and the joint main body can be seen from between the tongue portions, it is possible to easily inspect whether the joint cap is loose.

In this configuration, the tongue portion may be formed at a position avoiding a portion having an inner diameter in a direction parallel to the abutting direction at each of both end edges in the central axis direction of the protective metal fitting.
In this case, since the tongue portion is formed at a position avoiding a portion having an inner diameter in the direction parallel to the abutting direction at each of both end edges in the central axis direction of the protective metal fitting, the protective metal fitting is connected to the branch pipe. In the case where the protective cap is attached to a joint cap, a portion having an inner diameter in a direction parallel to the abutting direction of the end edge in the central axis direction of the protective metal fitting is approached from the radially outer side to the branch pipe. When this protective fitting is attached to the joint cap, the one peripheral end can be sufficiently separated from the branch pipe, and when the fastening means is tightened, a hand is hit against the branch pipe. It is difficult to secure a sufficient working space.

Furthermore, a plate member whose front and back surfaces extend along both the radial direction of the protective metal fitting and the central axis direction is provided so as to protrude outward in the radial direction at one peripheral end of each of the two divided metal fittings. Of these plate materials, either one may have a through hole and the other may have a female thread.
In this case, since the plate member protrudes from one of the peripheral ends of the two split metal fittings, the protective metal fitting can be more easily attached to the joint cap, for example, the protective metal fitting can be attached to the joint cap with only one hand. In addition to being able to be attached, the confirmation work after the attachment can be easily and reliably performed.

  According to the present invention, it is possible to effectively prevent the joint cap from cracking and to prevent the joint cap from expanding even if the joint cap cracks.

Hereinafter, an embodiment of a protective metal fitting according to the present invention will be described with reference to FIGS. 1 to 3.
First, a joint 50 including a joint cap 51 to which the protective metal fitting 10 is attached will be described with reference to FIGS. 2 and 3.
The joint 50 includes a channel pipe 52, a branch pipe 53 erected outward in the radial direction at an intermediate position of the channel pipe 52, and a connecting pipe connected to one end of the channel pipe 52. , And a two joint caps 51 are provided. Among these, the joint cap 51 is made of, for example, a resin material such as polybutene, and the channel pipe 52, the branch pipe 53, and the connecting pipe are integrally formed of the same material as the resin material forming the joint cap 51. .
Here, a seal holding member such as an O-ring or a pipe holding ring (not shown) is provided in the other end of the flow channel pipe 52 and the inside of the branch pipe 53, and the coupling cap 51 formed in a cylindrical shape is The seal holding member is fixed by being fitted to the other end of the flow channel pipe 52 and the outer peripheral surfaces of the branch pipe 53.
By preparing a plurality of joints 50 configured as described above and inserting the connecting pipe of the other joint 50 into the other end of the flow path pipe 52 in one joint 50 in a liquid-tight state or an air-tight state, a pipe header Is configured.

Next, the protective metal fitting 10 will be described.
In the present embodiment, the protective metal fitting 10 surrounding the joint cap 51 fitted to the outer peripheral surface of the other end portion of the flow channel pipe 52 among the two joint caps 51 included in the joint 50 will be described.
The protective metal fitting 10 is formed in a cylindrical shape and is equally divided into a first divided metal fitting 11 and a second divided metal fitting 12 along the circumferential direction thereof. And in these divided | segmented metal fittings 11 and 12, the other peripheral edge parts 11b and 12b are parallel to the central axis O of the said protective metal fitting 10 so that one peripheral edge part 11a and 12a may mutually approach and space apart. It is connected so as to be rotatable about the rotation axis L.

  In the present embodiment, the other peripheral end portion 11b of the first divided metal fitting 11 has a T-shape when viewed from the front side by cutting away portions away from the other peripheral end edge at both end edges 10a in the central axis O direction. It is formed and is bent toward the outside in the radial direction of the protective fitting 10 over the entire length in the direction of the central axis O. Further, the other peripheral end portion 12b of the second divided metal fitting 12 is formed in a hook shape in which a central portion in the direction of the central axis O is cut out and both end portions are folded back outward in the radial direction. Then, the other peripheral end portion 11b of the first divided metal fitting 11 is hooked on the other peripheral end portion 12b formed in a hook shape in the second divided metal fitting 12, so that both the metal fittings 11 and 12 are rotated. It is connected so as to be rotatable about the axis L.

Moreover, the one peripheral edge part 11a, 12a in both the division | segmentation metal fittings 11 and 12 is being fixed so that isolation | separation is possible by making it closely_contact | adhere in the abutting direction A by the fastening member 13 in the state mutually abutted.
In the illustrated example, the plate members 14 whose front and back surfaces extend along both the radial direction of the protective metal fitting 10 and the central axis O direction at one of the peripheral end portions 11a and 12a of both the divided metal fittings 11 and 12, respectively. , 15 project outwardly in the radial direction. Among these plate members 14 and 15, a through hole 14 a is formed in the plate member 14 provided in the first divided metal fitting 11, and a female screw portion 15 a is formed in the plate material 15 provided in the second divided metal fitting 12. As a result, the plate members 14 and 15 of the divided metal fittings 11 and 12 are brought into contact with each other, and the female screw portion is inserted in the state in which the fastening member 13 is inserted into the through hole 14a after the peripheral end portions 11a and 12a are abutted with each other. By fastening to 15a, these both board | plate materials 14 and 15 and one peripheral edge part 11a and 12a are mutually closely_contact | adhered to the abutting direction A, respectively.

  Further, in the present embodiment, the tongue 16 that protrudes inward in the radial direction and can clamp the joint cap 51 in the axial direction is formed on each end edge 10a of the protective metal fitting 10 in the central axis O direction. A plurality are formed at intervals in the direction. Arrangement positions along the circumferential direction of the plurality of tongue portions 16 at both end edges 10a of the protective metal fitting 10 are the same as each other.

In this embodiment, in this protective metal fitting 10, the inner diameter Y in the orthogonal direction B orthogonal to the abutting direction A is equal to the outer diameter of the joint cap 51 to which the protective metal fitting 10 is attached and in the abutting direction A. It is smaller than the inner diameter X in the parallel direction. That is, the inner peripheral surface of the protective metal fitting 10 has an elliptical shape having a long axis extending in a direction parallel to the abutting direction A and a short axis extending in the orthogonal direction B.
For example, the inner diameter Y is 0.95 times to less than 1 time the inner diameter X. The inner diameter Y does not have to be exactly the same as the outer diameter of the joint cap 51, and may be slightly larger or smaller than the outer diameter of the joint cap 51 as long as the following effects can be achieved. Good. Further, both peripheral end portions 11 a, 11 b, 12 a, 12 b of the first divided metal fitting 11 and the second divided metal fitting 12 are arranged in a portion having the inner diameter Y in the orthogonal direction B in the protective metal fitting 10. Furthermore, the through hole 14 a formed in the plate member 14 of the first divided metal fitting 11 is a long hole that is long in the orthogonal direction B.

  Furthermore, in this embodiment, the said tongue part 16 is formed in the position which avoided the part 10b which has the said internal diameter X in each both-ends edge 10a of the said protective metal fitting 10. As shown in FIG. Further, four tongue portions 16 are formed on each of both end edges 10 a of the protective metal fitting 10. The interval between the tongue portions 16 adjacent to each other in the circumferential direction is maximized in the portion 10b having the inner diameter X, and is substantially equal to the circumferential length of the tongue portion 16.

  In order to attach the protective metal fitting 10 configured as described above to the joint cap 51, first, in a state where one peripheral end portions 11a and 12a are separated from each other, the joint cap is provided between the two divided metal fittings 11 and 12. 51, and then the other peripheral end 11 b of the first split metal fitting 11 is hooked on the other peripheral end 12 b formed in a hook shape in the second split metal fitting 12. , 12 are rotated relative to each other around the rotation axis L so that one peripheral end portions 11a, 12a are brought into contact with each other, and the plate members 14, 15 of both divided metal parts 11, 12 are brought into contact with each other. Thereafter, the fastening means 13 is fastened to the female screw portion 15a formed on the plate 15 of the second divided metal member 12 while being inserted into the through hole 14a formed on the plate 14 of the first divided metal member 11, thereby The plate members 14 and 15 and the peripheral end portions 11a and 12a are brought into close contact with each other in the butting direction A. As described above, the protective metal fitting 10 is attached to the joint cap 51, and the joint cap 51 is surrounded by the protective metal fitting 10.

  At this time, since the inner diameter Y of the protective metal fitting 10 in the orthogonal direction B is equal to the outer diameter of the joint cap 51, the joint cap 51 is supported by the inner peripheral surface of the protective metal fitting 10 from the outside in the radial direction. Thus, the deformation amount of the joint cap 51 due to the action of the fluid pressure in the flow channel pipe 52 can be suppressed, and the joint cap 51 can be prevented from cracking.

  In addition, when the joint cap 51 is cracked, the deformation amount of the joint cap 51 due to the action of the fluid pressure in the flow channel pipe 52 can be suppressed by attaching the protective metal fitting 10 to the joint cap 51 urgently. Therefore, the crack can be prevented from expanding, and the inner diameter Y of the protective metal fitting 10 in the orthogonal direction B is equal to the outer diameter of the joint cap 51. By contacting the portion having the inner diameter in the orthogonal direction B of the inner peripheral surface of the protective metal fitting 10 with the cracked portion, it becomes possible to close the opening of the crack, and fluid leakage from the crack Can also be suppressed. Further, a water stop member such as an O-ring provided inside the other end portion (attachment portion) of the flow channel pipe 52 to which the joint cap 51 is attached in the joint main body 55, and the inner surface of the other end portion of the flow channel tube 52 It is also possible to prevent the gap between them from expanding.

Furthermore, the inner diameter Y of the protective metal fitting 10 is not equal to the outer diameter of the joint cap 51 over the entire circumference. As described above, the inner diameter Y in the orthogonal direction B of the protective metal fitting 10 is equal to the joint cap 51. The outer diameter is smaller than the inner diameter X in the direction parallel to the abutting direction A. Therefore, when the protective fitting 10 is attached to the joint cap 51, the fastening means 13 is tightened too much. It is possible to suppress the tightening force acting on the joint cap 51 and prevent the joint cap 51 from cracking or being easily cracked when the fluid pressure in the flow channel pipe 52 acts. Can do.
Thereby, when attaching the protective metal fitting 10 to the joint cap 51, it becomes possible to save the effort which adjusts the fastening force by the fastening means 13, and this protective metal fitting 10 can be attached easily.

  In this embodiment, since the tongue 16 is formed on the protective metal fitting 10, when the protective metal fitting 10 is attached to the joint cap 51, the protective metal fitting 10 is attached to the joint cap 51 in the direction of the central axis O. It becomes possible to prevent the time required for positioning from being prolonged, and after the protective metal fitting 10 is attached to the joint cap 51, the protective metal fitting 10 is detached from the joint cap 51 due to, for example, an unexpectedly applied external force. , Can be prevented from being displaced.

  And since the tongue part 16 is not continuously extended over the perimeter of the protective metal fitting 10, but is formed in multiple numbers at intervals in the circumferential direction, as shown in FIG. 2 and FIG. In the case where the branch pipe 53 is provided close to the joint cap 51, the non-formed portion of the tongue portion 16 of the end edge 10 a in the central axis O direction of the protective metal fitting 10 is connected to the branch pipe 53 on the radially outer side. By attaching the protective metal fitting 10 to the joint cap 51 so as to be close to each other, it becomes possible to avoid interference between the branch pipe 53 and the tongue portion 16, and the protective metal fitting 10 can be easily attached to the joint cap 51. Can be attached. Furthermore, since the boundary portion between the joint cap 51 and the joint main body 55 can be viewed from between the tongue portions 16, it is possible to easily inspect whether the joint cap 51 is loose.

  Furthermore, since the tongue portion 16 is formed at a position avoiding the portion 10b having the inner diameter X in the direction parallel to the abutting direction A at each of both end edges 10a of the protective fitting 10, the protective fitting 10 is shown in FIG. As shown in FIG. 3, in the case where the branch pipe 23 is attached to the adjacent joint cap 51, the edge 10 a of the protective fitting 10 in the direction of the central axis O in the direction parallel to the abutting direction A. When the protective fitting 10 is attached to the joint cap 51 so that the portion 10b having the inner diameter X is brought close to the branch pipe 23 from the outside in the radial direction, the one peripheral end portions 11a and 12a and the plate members 14 and 15 are connected. It becomes possible to be sufficiently separated from the branch pipe 23, and when tightening the fastening means 13, it is difficult to hit the hand against the branch pipe 23. The work space can be sufficiently secured.

  In addition, since the plate members 14 and 15 project from the peripheral end portions 11a and 12a of the split metal fittings 11 and 12, respectively, the protective metal fitting 10 can be attached to the joint cap 51 with only one hand. The protective metal fitting 10 can be easily attached to the joint cap 51, and the confirmation work after the attachment can be easily and reliably performed.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the tongue 16 and the plate members 14 and 15 are provided, but these may not be provided.
Further, the protective metal fitting 10 may be attached to a joint cap 51 provided on the branch pipe 53.

Next, the verification test about the effect demonstrated above was implemented.
First, a verification test was conducted on the fact that the protective cap 10 can suppress the occurrence of cracks in the joint cap 51.
As an Example, the structure which attached the protective metal fitting 10 to the joint cap 51 of the joint 50 was employ | adopted, and the joint 50 single-piece | unit to which the protective metal fitting 10 was not attached was employ | adopted as a comparative example. Then, it was confirmed whether or not cracks occurred in the joint cap 51 when these examples and comparative examples were submerged in a water tank in which warm water was stored and water pressure of atmospheric pressure or higher was applied. In addition, five examples and comparative examples were prepared.
As a result, in all of the examples, it was confirmed that no crack occurred in the joint cap 51 even after all 1000 hours had elapsed, while in the comparative example, all of the five joint caps before 500 hours had elapsed. It was confirmed that 51 had cracks.

Next, the verification test about the ability to close the opening of the crack which generate | occur | produced in the joint cap 51 with the protective metal fitting 10 was implemented.
In both the example and the comparative example, the same structure as that used in the above-described test and a joint cap 51 with a crack of the same size and depth was adopted. Then, it was confirmed whether or not air leakage occurred from the joint cap 51 when 0.6 MPa air was allowed to flow into the flow path pipe 52 of the joint 50 at room temperature.
As a result, it was confirmed that air leakage did not occur in the example, while air leakage occurred in the comparative example.

  It is possible to effectively prevent the joint cap from cracking and to prevent the joint cap from expanding even if a crack occurs.

It is a top view of a protection metal fitting shown as one embodiment concerning the present invention. It is a side view which shows the state which attached the protective metal fitting shown in FIG. 1 to the piping header. It is a top view which shows the state which attached the protective metal fitting shown in FIG. 1 to the piping header.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Protective metal fitting 10a Both-ends edge of protective metal fitting 11 11st division | segmentation metal fitting 11a, 12a One peripheral edge part 11b, 12b The other circumferential edge part 12 2nd division | segmentation metal fitting 13 Fastening member 14, 15 Plate material 14a Through-hole 15a Female thread part 16 Tongue Part 51 Joint cap A Abutting direction B Orthogonal direction L Rotation axis O Center axis of the protective fitting X Inner diameter in the direction parallel to the abutting direction Y Inner diameter in the orthogonal direction

Claims (4)

A cylindrical protective metal fitting that surrounds a coupling cap formed in a cylindrical shape,
Divided into a first divided bracket and a second divided bracket along the circumferential direction,
In both of these divided metal fittings, the other peripheral edges are rotatably connected around a rotation axis parallel to the central axis of the protective metal so that the one peripheral edges approach and separate from each other. One peripheral end portions are fixed so as to be separable by being brought into close contact with each other in the abutting direction by a fastening member while being abutted against each other,
In this protective metal fitting, an inner diameter in an orthogonal direction orthogonal to the abutting direction is equal to an outer diameter of the joint cap and is smaller than an inner diameter in a direction parallel to the abutting direction. . The protective metal fitting according to claim 1,
A plurality of tongue portions that protrude radially inward and can sandwich the joint cap in the axial direction are formed at both end edges in the central axial direction at intervals in the circumferential direction. Features protective metal fittings. The protective metal fitting according to claim 2,
The tongue is formed at a position avoiding a portion having an inner diameter in a direction parallel to the abutting direction at each of both end edges in the central axis direction of the protective bracket. The protective metal fitting according to any one of claims 1 to 3,
Plate members whose front and back surfaces extend along both the radial direction of the protective metal fitting and the central axis direction protrude from the circumferential end portions of the two divided metal fittings outward in the radial direction. A protective metal fitting in which a through hole is formed in one of the plate members and a female screw portion is formed in the other.

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