JP2008261467A - Joint locking tool and joint structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe connection locking body having high sealing force for connecting pipes to each other while securing high pull-off preventing force, and also to provide a pipe connection structure using the same. <P>SOLUTION: This joint locking tool comprises a base part 16 having an approximately U-shaped cross section and a pair of circular parts 11, 11 formed on both sides of the base part 16. In the circular part 11, a locking hole 14 is formed to lock collar portion side faces 2a, 6a of joints 1, 5. On the cross end of the base part 16, a bent piece 17 is formed to lock joint collar portions 2, 6. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a joint locking tool for connecting pipes, and more particularly, to a joint locking tool and a joint structure for locking and connecting the outer peripheral sides of the pipes with the pipes inserted.

Conventionally, as a locking tool for connecting ends of pipes, for example, there is a pipe connection device of Patent Document 1. In this pipe connecting device, a seal packing is mounted between the connected pipe and the connecting groove, and the locking groove formed on the outer periphery of the connected pipe and the outer peripheral locking step portion of the presser fitting externally attached to the connecting pipe. A stopper is attached and the opposing flanges are connected to connect the tubes together.
The locking body in this document is a plate material having two long holes symmetrically bent so that the two pieces face each other, and the two pieces are opposed to each other so that the annular part and the annular part are continuous. It has a shaped insertion part. When connecting a pipe with a locking body, a tube with a substantially square cross section of the tube is inserted into the elongated hole and the tube is prevented from shifting with respect to the elongated hole. The connection state can be maintained.

  Moreover, there exists a piping connection structure of patent document 2 as a piping connection structure using the other latching tool, for example. In this pipe connection structure, an engagement groove is provided in the elastic connection fitting, and in addition to fitting the flange of the pipe into the engagement groove, elastic engagement claws are provided at both ends of the elastic connection fitting, and this elastic engagement is provided. The claws are engaged with the outer peripheral surface of the flange to prevent the elastic connecting metal from coming off.

  By the way, in these pipe connection devices, the seal structure at the connection portion between the pipes is configured by an inner peripheral seal structure. The inner peripheral seal structure is designed to attach an O-ring to the outer periphery of the inner tube and seal the O-ring in close contact with the inner periphery of the outer tube when the tube is inserted into the outer tube. .

Japanese Utility Model Publication No. 56-42588 Japanese Patent No. 2897908

However, when the pipes are sealed with the inner peripheral seal structure as in Patent Documents 1 and 2, if the inner circumference of the outer pipe is unstable due to a weld bead or the like, On the other hand, the O-ring may not be able to adhere to the entire circumference, and in this case, the sealing performance is deteriorated.
For this reason, there exists an outer periphery seal structure which improved the sealing performance compared with this inner periphery seal structure. The outer peripheral seal structure is one in which an O-ring is attached to the inner periphery of an outer tube, and when the inner tube is inserted into this tube, the O-ring is brought into close contact with the outer periphery of the inner tube and sealed. Since the outer peripheral seal structure can seal the outer peripheral side of a pipe with high dimensional accuracy (small surface roughness), it can exhibit higher sealing performance than the inner peripheral seal structure and maintain stable sealing performance.

  A caulking joint is known as a method of connecting pipes using an outer peripheral seal structure. The caulking joint is formed by applying an external force such as a pressing force or a bending force with a jig from the outer peripheral side of the inserted tubes, and locally deforming and fixing the tube. An O-ring is attached to the inner periphery of the outer pipe of the caulking joint, and the O-ring can be tightly sealed to the outer periphery of the inner pipe after the pipe is connected.

  As a result, if the caulking joint outer periphery seal structure can be applied to a pipe connection structure using a locking tool, it is considered that the sealing performance will be improved. Since the O-ring housing portion of the outer tube of the outer tube bulges to the outer peripheral side, this bulge portion becomes a flange portion on one side, and this flange portion and the flange portion formed on the other tube are connected. . However, the bulging part of the caulking joint is often shaped like a round shape or a taper because of the structure in which an O-ring is attached to the inner periphery of the pipe. It is difficult to lock securely. Further, when the bulging part and the flange part are locked with the locking tool, a gap may be generated between the bulging part and the flange part due to the reaction force of the O-ring. For this reason, the flange portion is easy to come out of the long hole after mounting the locking tool, and the predetermined pull-out preventing force cannot be exhibited.

  Among these, the pipe connection structure of Patent Document 2 tries to prevent the elastic connection fittings from being pulled out by the elastic engagement claws, but the elastic engagement claws protrude from the outer peripheral surface of the flange. Since it engages in the pulling-out direction of the elastic connecting fitting, it is difficult to reliably engage with the rounded or tapered bulging portion in the caulking joint structure. In addition, the force generated by the elastic engagement claws acts in a direction perpendicular to the pipe connection direction (withdrawal direction), and the pipe is prevented from coming off by fitting the flange and the notch. The stopping power could not be improved.

  In view of the above-mentioned problems, the present invention has been developed as a result of earnest research. The purpose of the present invention is to provide excellent sealing force and connect pipes while ensuring high pull-out prevention force. An object of the present invention is to provide a joint fastener and joint structure that can be made.

  In order to achieve the above object, according to the first aspect of the present invention, a base portion having a substantially U-shaped cross section and a pair of arc portions are formed on both sides of the base portion, and a side surface of the flange portion of the joint is locked in the arc portion. It is the joint locking tool which formed the bending piece which locks a joint collar part in the width direction side part of a base while forming a locking hole.

  The invention which concerns on Claim 2 is the latching tool for joints which formed the curvature part along the width direction inner side in the top surface of the base.

  According to a third aspect of the present invention, there is provided a joint locking tool in which a bent portion for locking the flange side surface of the joint is formed in a guide extending portion extending from both ends of the arc portion.

  The invention according to claim 4 is the joint locking tool in which the bent pieces are formed on both sides in the width direction of the base portion, and the pair of bent pieces are locked to the side surface of the flange portion of the joint.

  The invention according to claim 5 is a joint in which a joint having a flange-like flange part and a joint having a bulge-like collar part at the tip are inserted and connected via a seal member mounted in the bulge-like collar part. Thus, the joint structure has a pair of hooks fitted and locked in locking holes formed in the arc portion, and a pair of bent side surfaces are locked by a pair of bent pieces.

  According to the first aspect of the present invention, there is provided a joint locking device and joint structure capable of connecting pipes while securing a high pulling prevention force by the locking hole and the bent piece and maintaining excellent sealing performance by the outer peripheral seal structure. Can be provided. Further, even when the fluid pressure inside the pipe exceeds a predetermined value and an excessive impact pressure is applied due to a water hammer phenomenon or the like, it is possible to suppress the depiping.

  According to the invention which concerns on Claim 2, the repulsive force with respect to the expansion direction of a circular arc part can be generated by providing a curvature part, force is added to the inner-periphery direction of a main body, when trying to plastically process a main body. When trying to deform, the arc part can exhibit a restoring force to stabilize the shape, and the rigidity can be secured and the strength can be improved, so the arc part can be prevented from breaking and the connected state of the pipe can be maintained It is a coupling fitting that can be made. In addition, the bending portion increases the rigidity with respect to bending, and the connection strength of the tube can be further strengthened by applying a force that suppresses deformation.

  According to the third aspect of the invention, it is possible to maintain the pull-out prevention force by preventing the locking tool main body from coming off from the pipe, and it is possible to connect the pipes with high accuracy while aligning the pipes. It is a tool.

  According to the invention which concerns on Claim 4, it is a latch for couplings which can hold | maintain a pipe | tube by clamping the collar part of a pipe | tube from both sides, and can exhibit the outstanding pull-out prevention force. Further, the locking tool main body can be prevented from coming off, and the connected state of the pipe can be maintained.

  According to the invention which concerns on Claim 5, it can provide the joint structure which can ensure the high pull-out prevention force and can connect pipes, exhibiting the outstanding sealing performance by the outer periphery seal structure.

DESCRIPTION OF EMBODIMENTS Embodiments and operations of a joint locking tool and joint structure in the present invention will be described below with reference to the drawings.
1 to 3, the joint locking device of the present invention connects the joint 1 and the joint 5, and although not shown, for example, another joint or a valve is integrally formed in the joints 1 and 5. Or it can be connected to the end of another pipe, so that it can be used in various places, for example, as part of pipes for unit equipment such as water heaters and floor heating systems. is there.

The joint 1 is formed with a flange-like flange portion (flange portion) 2 in the vicinity of the end portion, and a reduced-diameter insertion portion 3 is provided on the distal end side of the flange portion 2. In this example, the flange portion 2 is formed in a substantially quadrangular cross section, but may be provided in an arc shape or a taper shape (not shown).
The joint 5 has a bulge-shaped flange portion (bulge portion) 6 at the tip, and the bulge portion 6 has an appearance shape substantially the same as a joint portion of a general caulking joint. A seal member 7 made of an O-ring is mounted on the inner peripheral side of the bulging portion 6, and the joint 5 and the joint 1 are inserted and connected via the seal member 7, and the outer periphery of the joint 1 is connected to the inner side of the joint 5. An outer peripheral seal structure that seals with the seal member 7 is provided. The joint 1 and the joint 5 are inserted in a state where the insertion portion 3 is inserted, and in this state, the joint is connected by a joint locking body (hereinafter referred to as a locking body) 10. The joint 5 may have the same shape as the joint 1.

  As shown in FIGS. 4 and 5, the locking tool main body 10 has a base portion 16 having a substantially U-shaped cross section and a pair of arc portions 11 and 11 on both sides of the base portion 16. The arc portion 11 has a symmetrical shape, and a rectangular locking hole 14 for locking the flange portion 2 of the joints 1, 5 and the side surfaces 2 a, 6 a of the bulging portion 6 in the arc portion 11, 14 is formed by punching or the like. As shown in FIG. 6, the corner portion of the locking hole 14 is processed into a round shape to provide a rounded portion 14a. Moreover, the extending part 13 for guidance which extended the both ends of the circular arc part 11, and was bent at the predetermined angle is provided.

  On the side in the width direction of the base portion 16, a bent piece 17 is bent from the base portion 16 by a forming means such as press working, and the joint flange portions 2 and 6 can be locked by the bent piece 17. Provided. Moreover, by providing the bent pieces 17 on both sides of the base 16 in the width direction, the pair of bent pieces 17 and 17 are provided so as to be latched so as to be sandwiched from the flange side surfaces 2a and 6a of the joints 1 and 5. . As shown in FIG. 4, the bent piece 17 is preferably extended to the vicinity where the tip portion can contact the outer peripheral surfaces 1 a and 5 a of the joints 1 and 5 when bending.

Further, a warped portion 16 b is formed on the top surface 16 a of the base portion 16 along the width direction inner side of the base portion 16, and the warped portion 16 b is opposite to the center side of the locking tool body 10. It is provided in the arc shape along. The warped portion 16b can generate a repulsive force against the force in the direction in which the arc portion 11 expands, and suppresses the arc portion 11 from trying to expand the diameter. As shown in FIG. 4, the base portion 16 has a substantially W shape by providing a warped portion 16 b.
The locking tool main body 10 has a substantially C-hour shape from the base portion 16 to the circular arc portion 11 and is provided so as to be attachable to the joints 1 and 5 inserted while using the guide extension portion 13 as a guide portion.

The locking tool main body 10 is provided so as to be formed by punching a single plate-like metal material. At this time, in order to make the width W of the circular arc part 11 and the guide extension part 13 substantially the same dimension, as shown in FIG. 6, the outer shape of the locking part body 10 before bending is set to a substantially rectangular shape. Thus, when punching a metal coil (not shown) that is a material, the width of the metal coil material can be made the width W of the locking tool main body 10, and the material can be removed without waste. Therefore, the yield can be improved and the cost can be reduced.
Further, when the material is punched, the corner portion of the guide extension portion 13 is punched in a round shape (or by chamfering), and in addition to this, the taper portion 17 is formed to form the bent piece 17 in a substantially trapezoidal shape. By doing so, it is possible to avoid breakage due to cracks during punching and stress concentration during bending. The angle of the taper portion 17a is preferably about 20 ° from the vertical direction, for example.

  When connecting the joint 1 and the joint 5, they are inserted while the insertion portion 3 of the joint 1 is placed inside the joint 5, and in this state, a pair of hooks are inserted into the locking holes 14 formed in the arc portion 11. The joints 2 and 6 are fitted and locked, and the pair of flange side surfaces 2a and 6a are locked by the pair of bent pieces 17 and 17, thereby connecting the joint 1 and the joint 5 to obtain a predetermined joint structure. it can.

  The locking tool main body 10 has a dimension of the width C of the locking hole 14 so that the side surface 2a and the side surface 6a can be locked while the flange portion 2 and the bulging portion 6 are brought into close contact with each other. Since the side surface 6a has a curved shape when the locking tool main body 10 is mounted, even if the joint 1 and the joint 5 are in a slightly separated insertion state, the side surface 6a seems to slide into the locking hole 14. The joint 5 slides in the insertion direction with respect to the joint 1, and the locking tool body 10 can be locked while the bulging portion 6 and the flange portion 2 are accommodated in the width C of the locking hole 14. .

After the locking, the bent piece 17 is locked so as to sandwich the side surfaces 2a and 6a, and can be pressed against the flange portion 2 and the bulging portion 6 from the drawing side. Thus, it is possible to maintain a fitting state in the locking hole 14 and to exhibit an excellent pull-out preventing force.
Thereby, the joint 1 and the joint 5 can exhibit high sealing performance by the outer peripheral seal structure of the seal member 7, and the bent portions 19 and 19 connecting the base portion 16 and the arc portion 11 are the outer periphery of the joints 1 and 5. The bent portions 20 and 20 that are positioned substantially concentrically with the upper side of the surfaces 1a and 5a and that connect the arc portion 11 and the guide extension portion 13 are below the outer peripheral surfaces 1a and 5a of the joints 1 and 5. Since these four locations serve as fulcrums, the centering action of the joint 1 and the joint 5 can be exerted, and the internal seal member 7 is held in a stable state to provide a sealing property. It is further improved.

  The opening width G, which is the width of the bent portions 20 and 20, can be provided with substantially the same dimensions as the width A of the base portion 16, whereby the ratio of the opening width G to the diameter D of the joints 1 and 5 can be increased. When the tool main body 10 is mounted, the diameter can be easily increased, and the contact area of the arc portion 11 with respect to the side surfaces 2a and 6a can be increased, so that the pull-out preventing force of the joint 1 and the joint 5 is improved.

  Since the locking tool main body 10 is formed in a substantially C-shape that exerts an elastic force by a metal such as stainless steel having an elastic force, it can be easily attached to the joints 1 and 5 easily. Moreover, since this latching tool main body 10 is compact, the joints arrange | positioned in the narrow space can also be connected, and it can attach easily by one touch. In addition, the latching tool main body 10 should just be a material which has an elastic force, for example, may be a polymer material.

  Next, 2nd Embodiment of the latching tool for couplings in this invention is described. In the following embodiments, the same parts as those in the above embodiments are denoted by the same reference numerals, and the description thereof is omitted. As shown in FIG. 7, in this embodiment, a bent portion 32 is formed in the guide extending portion 38, and the bent portion 32 is locked to the flange outer peripheral surfaces 2 b and 5 b of the joints 1 and 5. . The bent portion 32 is bent in a direction facing the bent piece 37 when bending from the state of FIG. Thereby, when connecting the joint 1 and the joint 5 by the locking tool main body 30, it can be locked while being pinched by the bending piece 37 and the bending part 32. FIG.

  The bent portion 32 has a claw portion 30a that is bent with the tip end facing outward, and after the bent portion 32 is locked, the claw portion 30a is locked into the outer peripheral surfaces 2b and 6b. Thus, the joints 1 and 5 can be held from the circumferential direction. Thereby, even when a pulling force is applied to the locking tool main body 30, the locking tool main body 30 can be prevented from coming off from the flange portion 2 and the bulging portion 6, and the pulling-out preventing force of the locking body main body 10 can be prevented. Can be held.

Further, the bent portions 39 on both sides connecting the base portion 36 and the circular arc portion 31 are positioned substantially concentrically with the outer peripheral surfaces 1a and 5a, and the claw portions 30a are positioned substantially concentrically with the outer peripheral surfaces 2b and 6b. Therefore, these four places serve as fulcrums, and the alignment operation at the time of connection can be exerted. A seal member (not shown) can be mounted in a stable state, and excellent sealing performance can be exhibited.
Although not shown, the bent piece can be bent inward of the guide extending portion 38. In this case, the flange portion and the bulging portion are compared with the case where the bent piece is provided in a straight line. Since the locking tool main body is difficult to be detached, the bent piece acts as a guide when the locking tool main body is attached, thereby facilitating the mounting.

FIG. 9 shows a third embodiment of the joint locking tool according to the present invention. In this embodiment, the flange portion (bulging portion) 9 that is the mounting portion of the seal member 7 of the joint 8 is substantially omitted in cross section. It is provided in a square shape. In this case, the pipes can be connected to each other while the sealing performance is improved by the outer peripheral seal structure, and the side surface 9a of the bulging part 9 can be fitted in the locking hole 14 so that the flange part 2 bulges. When the portion 6 is fitted and locked in the locking hole 14, it can be made more stable. Thereby, the pulling-in prevention force of the joint 1 and the joint 8 can be improved and can be connected.
As described above, the joint locking device of the present invention can be applied to connection of joints having flange portions of any cross-sectional shape regardless of the cross-sectional shape of the flange portion, as long as both joints have flange portions. In addition to the caulking joint-shaped collar part, even a collar part having a generally U-shaped cross section and other collar parts has a function of improving the pull-out preventing force. Furthermore, if it has a collar part, it can also be used for the connection of the joint of an inner peripheral seal structure.

A joint was connected using the joint fastener of the present invention, and the pull-out preventing force of this joint was measured. As test conditions, the nominal diameter of the joint is 13A, the material is SUS315J2 (joint 5) and SUS304 (joint 1), the outer diameter of the collar is about 22 mm, the width is about 2.5 mm, and the nominal diameter is 13A.
The locking tool is formed by punching a metal material made of a thin plate into the state shown in FIG. 6, pressing it, and bending it into the state shown in FIG. 1. The specimen of the locking tool is made of SUS301CSP-H, and the plate thickness (not shown) is 1 mm. In the stamped state of FIG. 6, the width W of the locking tool is 16 mm, the width C is 8 mm, and the length L is 6 mm. After pressing the locking tool of FIG. The opening width G is formed to 10 mm.
In the test method, a tensile load was applied to the joint connected by the locking tool using an Amsler universal testing machine, and this measurement result was used as a pull-out prevention force. The test results are shown in Table 1.

  Specimen 1 (invention) has a shape in which a bent piece is added to the specimen 5 (Comparative Example), the base is arc-shaped, and a warped part is provided. The stopping power was obtained. The specimen 2 (invention) has a shape in which a bent portion is added to the specimen 1, and a pulling prevention force substantially similar to that of the specimen 1 was obtained. Specimen 3 (present invention) has a shape in which the length of the bent piece in Specimen 2 is halved, and about 1.1 times the pull-out preventing force is obtained as compared with Specimen 5. . The specimen 4 (invention) had a shape with an arcuate base with respect to the specimen 5, and although the improvement of the pull-out prevention force was not observed, the breakage of the locking tool main body was avoided.

From the above test results, the following was confirmed.
The bent piece has a great effect on the improvement of the pull-out prevention force, and further, based on the test results of the specimen 1 and the specimen 2, the bent piece is formed long and locks the side surface of the collar portion. It has been confirmed that it is optimal to secure a large amount. In addition, it was confirmed from the result of the sample 2 that the rigidity of the base portion can be increased and the pull-out preventing force can be improved only by bending (when the bent piece is provided and the bent portion is not provided).
When the warped part is provided on the base, it is confirmed that it contributes to the improvement of the strength of the locking tool in that the breakage of the locking tool is avoided, although no improvement in the numerical pull-out prevention force is observed. It was done.
Although the bent portion does not directly contribute to the improvement of the pull-out prevention force, it is an effective structure when importance is attached to the pipe alignment state at the time of connection.

It is the perspective view which showed the connection state of the joint by the latching tool for joints in this invention. It is sectional drawing in the XZ plane of FIG. It is sectional drawing in the YZ plane of FIG. It is a side view of FIG. It is SS sectional drawing of FIG. It is the expanded view which showed 1st Embodiment of the latching tool for couplings in this invention. It is the side view which showed 2nd Embodiment of the latching tool for couplings in this invention. It is the expanded view which showed 2nd Embodiment of the latching tool for couplings in this invention. It is sectional drawing which showed 3rd Embodiment of the latching tool for couplings in this invention.

Explanation of symbols

1, 5 Fitting 2 Flange (Ring)
2a collar part side surface 2b collar part outer peripheral surface 6 bulging part (buttock part)
6a collar side surface 6b collar outer peripheral surface 7 seal member 10 joint locking fixture body 11 arc portion 13 guiding extension portion 14 locking hole 16 base portion 16a top surface 16b warped portion 17 bent piece 32 bent portion

Claims (5)

  A base portion having a substantially U-shaped cross section and a pair of arc portions are formed on both sides of the base portion, and a locking hole for locking the flange side surface of the joint is formed in the arc portion, and a width direction side portion of the base portion is formed. A joint locking tool, wherein a bent piece for locking the joint collar is formed.   The joint locking tool according to claim 1, wherein a warped portion is formed on the top surface of the base portion along the inner side in the width direction.   The joint locking tool according to claim 1 or 2, wherein a bent portion that locks the outer peripheral surface of the flange portion of the joint is formed in a guide extending portion that extends at both ends of the arc portion.   The joint locking tool according to claim 1, wherein the bent pieces are formed on both sides in the width direction of the base portion, and the pair of bent pieces are locked to a side face of the flange portion of the joint.   A joint having a flange-shaped flange portion and a joint having a bulge-shaped flange portion at the tip thereof inserted and connected via a seal member mounted in the bulge-shaped flange portion, formed in the arc portion The pair of flanges are fitted and locked in the locking holes, and the pair of bent side surfaces are locked by the pair of bent pieces. Joint structure.

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