JP5145450B1 - Telescopic flexible pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a conventional stopper ring fixing work with poor workability and to prevent generation of rust by eliminating a gap, and to reliably perform a coating process and to achieve a product length and allowance. To provide an elastic pipe joint that can easily cope with the amount of bending.
SOLUTION: A connecting pipe 1 having a predetermined length is fitted to both ends of the connecting pipe so as to be slidable in the pipe axis direction while maintaining watertightness, and a part of the outer peripheral surface forms a spherical surface. A pair of rotating spheres 2, 2 and a pair of cases 3, 3 fitted so as to be slidable and rotatable while maintaining watertightness on the inner peripheral surface forming the same spherical surface as the outer peripheral surface of these rotating spheres In the expansion / contraction flexible pipe joint, the stopper 15 for retaining is integrally provided on the outer peripheral surface of one end of the connecting tube 1 on the rotating sphere side, and the rotating sphere can be inserted into the outer peripheral surface of the other end. A male screw 17 having a diameter is provided, and a flange 18 with a stopper which can be attached and detached is provided by screwing the male screw and a female screw 19 provided on the inner peripheral surface.
[Selection] Figure 1

Description

  TECHNICAL FIELD The present invention relates to an expansion / contraction flexible pipe joint, and more specifically, a connected pipe such as a water pipe is connected to be elastically flexible so that a load in a bending direction is applied to the embedded pipe even if the buried ground fluctuates due to an earthquake or the like. This is related to a technique that prevents damage to the buried piping and the like so as not to be added.

  Conventionally, what is shown to patent document 1 as this kind of pipe joint is known. As is apparent from the description of claim 1 of FIG. 1 and FIG. 1, a pair of cases that can be connected to the opposing ends of the tubular body and a part of the inner peripheral surface forms a spherical shape, A pair of spherical rings that are fitted in each case while maintaining watertightness and that can slide while being in contact with the inner surface of the case, and the respective cases that can move along the outer peripheral surface of each spherical ring. The press ring fixed to the tip opening of the tube and the axial direction over the region between the stoppers provided in the outer circumferential surface of the intermediate portion and the both end portions, fitted with watertightness in both spherical rings. In the expansion / contraction flexible pipe joint provided with a connecting pipe that can slide relative to each other, a stopper at the front end opening surface of each push ring and an intermediate part of the connecting pipe are applied to the opening ends facing each other in each spherical ring. A locking projection that can be contacted is provided.

  According to such a pipe joint, as shown in FIG. 2, either one of the pipes connected to each case is displaced in the vertical direction, and the connecting pipe fitted to each spherical ring is rocked to the maximum. When it moves, the tip opening surface of the press ring comes into contact with the locking protrusion provided at the open end of the spherical ring, so that the press ring and the connecting pipe are prevented from coming into strong pressure contact, and therefore the stretchability of the connecting pipe is impaired. It is said that the fear of functional damage as an expansion joint, which has been a problem in the past, can be solved.

JP-A-10-274371

  By the way, in the conventional pipe joint as described above, when connecting the connecting pipe, after inserting one end of the connecting pipe into the spherical ring, the stopper ring is fitted into an annular groove formed in the end, and It is necessary to connect and fix with bolts. However, the work of fixing the stopper ring is a work in the spherical ring, so the workability is poor. In addition, the wetted parts such as the stopper ring and bolt are painted after installation, but there is still a gap between the stopper ring and the annular groove or between the stopper ring and the bolt due to mechanical tolerances. There is a possibility that water will enter the gap and cause rust. In addition, since the connecting tube inserted between a pair of spherical rings is a single tube, and the product length and the amount of flexibility depend largely on the length of the connecting tube, it is necessary to change the length and amount. There are limits and it is difficult to respond.

  Therefore, the present invention solves the problems of the conventional pipe joint, eliminates the conventional work of fixing the stopper ring with poor workability, and suppresses the formation of gaps, thereby eliminating the occurrence of rust. Another object of the present invention is to provide a stretchable pipe joint that can be reliably subjected to a coating process and can easily cope with a product length and a flexible amount.

In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that a connecting pipe having a predetermined length is fitted to both ends of the connecting pipe so as to be relatively slidable in the pipe axis direction while maintaining water tightness. A pair of rotating spheres whose outer peripheral surfaces form a spherical surface, and an inner peripheral surface that forms the same spherical surface as the outer peripheral surfaces of these rotating spheres, are slidably fitted and slidably engaged with each other. In the expansion / contraction flexible pipe joint provided with a pair of cases, the connecting pipe is composed of a pair of single pipes, and these single pipes are integrally provided with a stopper for stopper on one outer peripheral surface on the rotating sphere side. Is formed in a small-diameter pipe part whose opposite end is slightly recessed inward, and rotates to the outer peripheral surface having the same diameter as the part other than the small-diameter pipe part at the end of the small-diameter pipe part A male screw with a diameter that allows insertion of a sphere is provided, and the male screw is attached to and detached from the inner screw by engaging with a female screw provided on the inner peripheral surface. And flanges with stoppers are provided, and bolts and nuts inserted into bolt holes provided in these flanges are joined and fixed with watertightness. The flanges of the flanges are parallel to the tube axis. As described above, the small-diameter pipe portion is provided so as to extend close to the proximal end position .

According to a second aspect of the present invention, in the first aspect, the case is integrally provided with a flange portion on the outer peripheral surface at one end opposite to the rotating sphere, and the rotating sphere is provided at the other end opposite to the case. A short tubular sliding portion extending in the axial direction is integrally provided.

According to a third aspect of the present invention, in the second aspect , the flange with a stopper is provided with a mounting bolt hole at a position where the diameter of the bolt hole provided in the flange portion of the case is the same as the diameter from the tube center axis. It is characterized by.

According to a fourth aspect of the present invention, in the first aspect , the connecting pipe has an extension pipe between opposing ends of the single pipe, and both ends of the extension pipe and the opposing end of the single pipe have bolts and nuts. Thus, it is characterized in that it is bonded and fixed while maintaining watertightness .

The present invention is as described above, and the connecting pipe is composed of a pair of single pipes, and these single pipes are integrally provided with a stopper for retaining at one end outer peripheral surface on the rotating sphere side. The rotating sphere can be inserted into the outer peripheral surface which is formed in a small-diameter tube portion whose opposite end portion is slightly recessed inward, and has the same diameter as the portion other than the small-diameter tube portion at the end of the small-diameter tube portion. The external thread is provided with a flange with a stopper that can be attached and detached by screwing the internal thread provided on the inner peripheral surface of the external thread, and a bolt that is inserted into a bolt hole provided in these flanges. The nut is fixed and joined with water tightness, and the flange is provided to extend near the base end position of the small-diameter pipe so that the rod-like stopper is parallel to the pipe axis. Workability like fixed work It may not a have work, a good workability. In addition, since the stopper for retaining is integrally provided and no gap is generated as in the prior art, the coating process can be reliably performed without generating rust. In addition, there is an excellent effect that the product length and the flexible amount can be easily handled.

BRIEF DESCRIPTION OF THE DRAWINGS It is a front view of the upper half part fracture | rupture which shows the expansion-contraction flexible pipe joint of 1st Embodiment of this invention. It is an expanded sectional view which shows the connection part of the divided connection pipe same as the above. The flange with a stopper same as the above is shown, (A) is a left side view thereof, (B) is a front sectional view thereof, (C) is a right side view thereof, (D) is an enlarged detailed front view of the outer peripheral portion thereof, (E ) Is an enlarged detailed right side view of the outer periphery. It is a front view of the right half part same as the above. It is drawing explaining the effect | action of expansion-contraction flexibility same as the above. It is a front view of the upper half part fracture | rupture which shows the expansion-contraction flexible pipe joint of 2nd Embodiment.

  Hereinafter, embodiments of the expansion / contraction flexible pipe joint according to the present invention will be described with reference to the drawings.

<First embodiment>
FIG. 1 is a front view of the upper half portion of the expansion / contraction flexible pipe joint. In FIG. 1, reference numeral 1 denotes a connecting pipe comprising a pair of single pipes 1a and 1b. A pair of rotating spheres 2 and 2 are slidably fitted to both ends of the connecting pipe 1 in the tube axis direction, and a part of the outer peripheral surface forms a spherical surface. It is a pair of cases arrange | positioned in sliding contact with the internal peripheral surface used as the same spherical surface as this outer peripheral surface. A short tubular sliding portion 4 extending in the axial direction is integrally provided at the other end of the rotating spheres 2 and 2 opposite to the cases 3 and 3, and the inner peripheral surface of the sliding portion and the connecting tube 1 Between the outer peripheral surfaces, a plurality of O-rings 5 are arranged in the tube axis direction, for example, fitted into annular grooves formed on the inner peripheral surface of the sliding portion 4. A flange portion 6 is provided on the outer peripheral surface of the outward ends of the cases 3 and 3, and the flange portion is coupled and fixed with a connection flange, a bolt, and a nut formed at opposite ends of a pipe to be connected such as a water pipe (not shown). A plurality of bolt holes 7 are formed in the circumferential direction.

  An annular recess is formed in the inner peripheral surface of the other inward side of the cases 3, 3, and an annular packing 8 is attached to the recess and is disposed in contact with the outer peripheral surface of the rotating spheres 2, 2. Bolt holes 11 and 12 are formed in the flange portions of the two members that are pressed by the press wheel 10 and in contact with each other to be coupled and fixed by bolts and nuts. The annular packing 8 is made of, for example, natural rubber, synthetic rubber, synthetic resin, or other flexible material so that water tightness can be maintained in a state where the outer peripheral surfaces of the rotating spheres 2 and 2 and the inner peripheral surfaces of the casings 3 and 3 are in sliding contact. ing.

  The connecting pipe 1 has a configuration in which a pair of single pipes 1a and 1b are connected by connecting opposite ends. An annular stopper 15 is integrally provided on the outer peripheral surface of one end of the single tubes 1a and 1b on the rotating spheres 2 and 2 side. The opposite ends of the single tubes 1a and 1b are formed in a small-diameter pipe portion 16 that is slightly recessed inward, and the outer peripheral surface has the same diameter as the portion other than the small-diameter pipe portion at the end of the small-diameter pipe portion. 2 and 3, a male screw 17 is formed. A female screw 19 formed on the inner peripheral surface of the annular flange 18 with a stopper is screwed onto the male screw 17. A plurality of bolt holes 20 (16 in the drawing) are formed in the annular flange 18 in the circumferential direction so as to be coupled and fixed to each other with bolts and nuts. The bolt hole 20 and the bolt hole 7 provided in the flange portion 6 of the cases 3 and 3 are provided at positions having the same diameter with respect to the tube center axis. Further, a plurality of rod-like stoppers 21 extend between the bolt holes 19 at arbitrary positions in the annular flange 18 and close to the proximal end position of the small-diameter pipe portion 16 so as to be parallel to the pipe axis ( 4 in the drawing). Reference numeral 22 denotes a stopper 21 rib. Reference numeral 23 denotes a watertight annular gasket interposed between the ends of the small-diameter pipe portions 16 of the single pipes 1a and 1b.

  FIG. 4 shows the length and diameter of each part of the single pipe 1a, the rotating sphere 2 and the case 3 of the connecting pipe 1. As described above, the bolt hole 19 of the annular flange 18 with stopper and the flange of the case 3 are shown. The bolt holes 7 provided in the portion 6 are provided at positions where the diameters from the central axis of the tube are the same, and the sizes and the number of the holes are also provided correspondingly. Thus, by providing the bolt hole 19 at the same diameter as the bolt hole 7, the connected pipe connected to the flange portion 6 can also be connected to the flange portion 18.

  Further, the outer diameter D1 of the annular stopper 15 from the tube center axis is larger than the inner diameter D2 of the sliding portion 4 of the rotating sphere 2 and the inner diameter D3 of the flange portion 6 of the case 3 (D3 <D2 <D1). Thereby, after assembling, the single pipes 1a and 1b of the connecting pipe 1 are prevented from coming off by the annular stopper 15 coming into contact with the inward annular end 25 of the sliding part 4 in the rotating spheres 2 and 2, On the other hand, the stopper 21 is brought into contact with the outward annular end portion 26 of the sliding portion 4 so that the minimum interval is obtained. FIG. 1 shows a state of an intermediate interval between the maximum interval and the minimum interval.

  The assembly of the expansion / contraction flexible pipe joint will be described. When assembling, first, the separated single tubes 1a and 1b before the connection of the connecting tube 1 are inserted into the rotating spheres 2 and 2 from the small diameter tube portion 16 side from the spherical portion side. At this time, the outer periphery of the end portion of the small-diameter pipe portion 16 on which the male screw 17 is formed has the same diameter as the other portions, so that insertion is not hindered. After that, the inner peripheral surfaces of the cases 3 and 3 are fitted to the outer peripheral surfaces of the rotating spheres 2 and 2 so as to be in sliding contact with each other, and the annular packing 8 and the push ring 10 are sequentially disposed to The bolts and nuts to be inserted into 12 are coupled and fixed. Before and after that, the female screw 19 of the annular flange 18 is screwed onto the male screw 17 of the single pipes 1a and 1b, and a gasket 23 is interposed between the ends of the small-diameter pipe part 16, and then the bolt hole 20 of the flange 18 is inserted. Connect and fix with bolts and nuts to be inserted. Thereby, it assembles like FIG.

  That is, since the single tubes 1a and 1b can be inserted from the small-diameter tube portion 16 side during assembly, an annular stopper 15 provided on one outer peripheral surface of the rotating spheres 2 and 2 on the opposite side of the insertion is provided with the single tube. It can be provided integrally with 1a and 1b. Therefore, it is not necessary to perform a work of connecting and fixing a separate stopper ring with a bolt after insertion as in the case of a conventional pipe joint, and workability is improved. In addition, there is no gap between the stopper ring and the like as in the prior art, and rust is not generated, and the coating process can be performed reliably. Further, in the conventional pipe joint, the connecting pipe inserted between the pair of spherical rings is a single pipe, and the product length and the flexible amount largely depend on the length of the connecting pipe, so that the length and quantity are changed. However, in the pipe joint of the first embodiment, a male screw 17 having a diameter through which the rotating spheres 2 and 2 can be inserted is provided on the outer peripheral surface of the other end. The male screw 17 and the female screw 19 provided on the inner peripheral surface of the flange 18 with the stopper are screwed together to be detachable, and the single pipe 1b of the connecting pipe 1 and the pipes A and B to be connected can be connected to the flange 18. Therefore, the product length and the amount of flexibility can be easily accommodated.

  When piping is performed using the expansion / contraction flexible pipe joint having the above-described configuration, the connected pipes A and B are arranged on both sides of the expansion / contraction flexible pipe joint, and the flanges thereof are casings of the expansion / contraction flexible pipe joint. 3 and 3 are joined and joined to the flanges 6, and the pipes A and B are connected to the single pipes 1 a and 1 b of the connecting pipe 1 to complete the piping. Such piping work is connected to the flange 6. Since only the flanges of the pipes A and B are connected, it is extremely simple and can be completed in a short time.

  In the piping state as described above, when one of the connected pipes A and B connected to the cases 3 and 3 is displaced downward due to ground subsidence due to an earthquake or the like, the connecting pipe 1 and The rotating spheres 2 and 2 are relatively slid and expanded and contracted, and the rotating spheres 2 and 2 are rotated in the cases 3 and 3, whereby the connecting tube 1 is swung, and the connected tube A , B is absorbed. FIG. 5 shows a state in which the annular stoppers 15 of the single pipes 1a and 1b of the connecting pipe 1 are in contact with the inward annular end 25 of the sliding part 4 in the rotating spheres 2 and 2 so that they are at the maximum distance. The center axis XX of the pipes A and B to be connected and the center axis YY of the connecting pipe 1, that is, the rotating spheres 2 and 2, intersect with each other at an angle α (20 ° in this case). The connection state of the connecting pipes A and B is shown. In this case, the rotating spheres 2 and 2 are centered on the center c, and the outer peripheral surfaces of the rotating spheres 2 and 2 are inside the casings 3 and 3. By sliding on the peripheral surface, the rotating spheres 2 and 2 rotate at a desired angle. In FIG. 5, β indicates the amount of displacement at that time. Such piping work is very simple and can be completed in a short time. Needless to say, the inclination angle α between the connecting pipe 1 and the casings 3 and 3 may be a numerical value other than those described above.

<Second Embodiment>
FIG. 6 shows a second embodiment of the present invention. Since this embodiment has the same parts as those of the first embodiment, such parts are denoted by the same reference numerals and description thereof is omitted. Mainly different parts will be described.

  In the first embodiment, the single pipes 1a and 1b of the connecting pipe 1 are connected to each other, but in this second embodiment, an extension having flanges on both outer peripheral surfaces between the single pipe 1a and the single pipe 1b of the connecting pipe 1 is provided. A tube 28 is connected. If such an extension pipe 28 is used by being connected by the flange, there is an advantage that the length of the connecting pipe 1 can be adjusted appropriately and the displacement amount can be further increased. Moreover, since the bolt hole 19 of the annular flange 18 with stopper and the bolt hole 7 provided in the flange portion 6 of the case 3 are provided at the same diameter position, the connected pipes A and B can be used as the extension pipe 28. It is. As is apparent from this connection example, the expansion / contraction flexible pipe joint has a configuration of any one of the single pipes 1a and 1b of the connecting pipe 1, any of the rotating spheres 2 and 2, and any of the casings 3 and 3. It is also possible to take. That is, the pipe joint is as shown in FIG. 4, and the connected pipe A may be connected to the flange portion 6 of the case 3 and the connected pipe B may be connected to the annular flange 18 with a stopper.

  Each of the embodiments described above is merely a preferred example, and the present invention includes appropriate different embodiments within the scope described in the claims. Further, the connecting tube 1, the rotating spheres 2, 2 and the cases 3, 3 shown in the respective embodiments are only preferable examples, and the specific shape, structure, and the like are replaced with other arbitrary ones. Is possible.

DESCRIPTION OF SYMBOLS 1 Connection pipe 1a, 1b Single pipe 2, 2 Rotating sphere 3, 3 Case 4 Sliding part 5 O-ring 6 Flange part 7, 11, 12, 20 Bolt hole 8 Annular packing 10 Push ring 15 Annular stopper 16 Small diameter pipe part 17 Male thread 18 Annular flange 19 Female thread 21 Stopper 23 Annular gasket A, B Connected pipe

Claims (4)

A pair of pivots with a predetermined length of the connecting pipe and fitted at both ends of the connecting pipe so as to be slidable relative to each other while maintaining watertightness, and a part of the outer peripheral surface forms a spherical surface In a telescopic flexible pipe joint comprising a sphere and a pair of cases that are slidably contacted with each other while maintaining watertightness on an inner peripheral surface that forms the same spherical surface as the outer peripheral surface of these rotating spheres.
The connecting pipe is composed of a pair of single pipes, and these single pipes are integrally provided with a stopper for retaining at one end outer peripheral surface on the rotating sphere side, and the opposite end portions are slightly recessed inward. A male screw having a diameter through which a rotating sphere can be inserted is provided on the outer peripheral surface formed in the small diameter pipe portion and having the same diameter as the portion other than the small diameter pipe portion at the end of the small diameter pipe portion. Is provided with a flange with a stopper that can be attached and detached by screwing a female screw provided on the inner peripheral surface, and a bolt and nut inserted into a bolt hole provided in these flanges to maintain watertightness and to be fixed. The flange is provided so as to extend near the base end position of the small-diameter pipe portion so that the rod-like stopper is parallel to the pipe axis . The case is integrally provided with a flange portion on the outer peripheral surface at one end opposite to the rotating sphere, and the rotating sphere is integrally provided with a short tubular sliding portion extending in the axial direction at the other end opposite to the case. The expansion-contraction flexible pipe joint according to claim 1 . The expansion / contraction flexible pipe joint according to claim 2 , wherein the flange with a stopper is provided with a mounting bolt hole at a position where the diameter of the bolt hole provided in the flange portion of the case is the same as the diameter from the pipe center axis. The connecting pipe has an extension pipe between opposite ends of the single pipe, and both ends of the extension pipe and the opposite end of the single pipe are joined and fixed with bolts and nuts while maintaining watertightness. Item 2. The expandable flexible pipe joint according to Item 1 .

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