JP2010236593A - Connection structure of inner surface-coated pipe body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable the provision of sealing performance to a connection portion by utilizing the resin coat layer of an inner surface-coated pipe body and the easy and sure exhibition of the alignment action between pipe bodies at the connection portion. <P>SOLUTION: The connection structure of the inner surface-coated pipe body has an insertion port 20 provided to a first inner surface-coated pipe body 10, a receiver port 60 provided to a second inner surface-coated pipe body 50, a sealing mechanism 70 and a fastening mechanism 80. The insertion port 20 is formed by projecting the first resin coat layer 12 of the first inner surface-coated pipe body 10 to the outside of the end of an outer pipe 11. The receiver port 60 is formed from an enlarged cylindrical portion 61 formed by extending the outer pipe 51 of the second inner surface-coated pipe body 50 and an extended resin portion 62 formed by extending a second resin coat layer 52. The sealing mechanism 70 has a first packing receiver 71 integrally molded with the root of the insertion port 20 using a resin, a second packing receiver 75 integrally molded with the end of the extended resin portion 62 using a resin, and a packing 78. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention provides a connection structure for an inner surface-coated tube, and in particular, improves the reliability of the seal at the connection point even though it is not necessary to perform a process for forming a seal seat surface in a post-process after the production of the inner surface-coated tube. In addition, the present invention relates to a connection structure for inner surface-coated tubes in which measures for enabling the inner surface-coated tubes to be easily fastened with high accuracy are taken.

  By forming a resin coating layer on the inner surface of a pipe body such as a cast iron pipe joint intervening in the middle of a pipe or a metal long pipe material for forming a long pipe, the pipe joint or pipe It is well known to suppress internal corrosion of materials.

  By the way, various proposals have been conventionally made regarding the connection structure of the tubular body (see, for example, Patent Document 1 and Patent Document 2).

  In Patent Document 1, as a structure for imparting a sealing property to a connection portion of the first and second tubular members, a coating layer formed on a stepped end surface of the first tubular member and an end surface of the second tubular member are provided. The sealing ring is interposed between the covering layer of the first tubular member and the first tubular member by tightening the press ring externally fitted to the second tubular member by screwing it into the end of the first tubular member. It is described that clamping is performed between the end surfaces of two tubular members.

  In Patent Document 2, a cylindrical insertion port is provided in one of two pipe members, a cylindrical receiving port is provided in the other, and the insertion port of one pipe member is connected to the other. There is a description of a structure in which a connection portion is sealed by inserting a rubber ring in a gap between an insertion port of one pipe material and a reception port of the other pipe material while being inserted into the reception port of the pipe material.

JP-A-7-180787 JP 2003-278966 A

  When the connection structure proposed by Patent Document 1 is applied to the connection structure of the inner surface-coated tube described above, a seal having high smoothness that exhibits a sealing property by close contact with the seal ring on the end surface of the inner surface-coated tube It is necessary to form a seating surface. Moreover, in the sealing structure of the connection location proposed by patent document 2, the inner surface of a receptacle and the outer surface of an insertion port are formed as a seal seat surface which has the high smoothness which exhibits a sealing performance by contact | adherence with a rubber ring. Need to be.

  However, if the inner surface-coated tube is a metal tube such as a cast iron tube, a high-smooth seal seating surface is formed on the end surface, or a high-smooth seal is formed on the inner surface of the receiving port or the outer surface of the insertion port. Forming a seating surface may require a subsequent process such as troublesome polishing. In particular, if the pipe body is a cast iron pipe, the surface immediately after casting is often a rough surface unsuitable for the seal seat surface. Therefore, an extra post-process for forming the seal seat surface is performed. There is a problem in the production process that is essential.

  In addition, in the above-mentioned Patent Documents 1 and 2, the alignment action between the two tubular members or the pipe materials is not easily and reliably exhibited at the connection point, or even if it is achieved, it is not so easy. In addition, since it is not surely exhibited, it has been difficult to align the pipes on both sides of the connecting portion with high accuracy.

  In view of the above problems and circumstances, the present invention can be used as a sealing surface having high smoothness as it is without the surface of the resin layer formed by injection molding or the like being subjected to any post-processing. It was made by paying attention to the fact that it can.

  That is, the present invention forms a bent pipe having a desired shape in the piping system by taking measures that can provide a sealing property to the connection portion by using the resin coating layer originally provided in the inner surface coated pipe body. It is an object of the present invention to provide a connection structure for an inner surface-covered tube body that can be suitably used for connection between long pipe materials as well as can be suitably used for connection between pipe joints used when And

  In addition, the present invention provides a connection structure for an inner surface-covered tubular body that can provide a sealing property at a connection location, and can easily and surely exert a centering action between the tubes at the connection location. The purpose is to do.

  The connection structure of the inner surface-coated tube according to the present invention includes an insertion port provided in the first inner surface-coated tube, a receiving port provided in the second inner surface-coated tube, and the insertion port is inserted inside, A sealing mechanism that seals the fitting portion of the insertion port and the receiving port; and a fastening mechanism that fastens the fitting portion in the tube axis direction and fastens the first and second inner surface-coated tubes. ing.

  And the said insertion port is formed in a cylindrical shape by projecting the 1st resin coating layer with which the 1st inner surface covering tube body is equipped to the outside of the end of the outer tube of the 1st inner surface covering tube body, The receiving port of the inner surface-coated tube includes an expanded cylindrical portion formed by extending an outer tube of the second inner surface-coated tube, and a second resin coating layer provided in the second inner surface-coated tube. And a cylindrical resin extending portion that covers the inner surface of the bulging cylindrical portion.

  Further, the seal mechanism is formed integrally with a resin at the base portion of the cylindrical insertion opening to form a first packing seat surface having a rearward rising slope, and the cylindrical resin extension. A second packing receiving portion that is integrally formed with resin at the end of the protruding portion to form a second packing seat surface that is inclined upward, and each of the packing seating surfaces of the first and second packing receiving portions; And a packing sandwiched between them.

  According to this invention, the resin insertion opening can be integrally formed when the first resin coating layer is formed on the first inner surface coated tube. Moreover, the resin extension part which coat | covers the inner surface of the bulging cylinder part of a receptacle can also be integrally formed collectively, when forming a 2nd resin coating layer in a 2nd inner surface covering tubular body. In addition, with respect to the seal mechanism, the first packing seat surface is formed by a first packing receiving portion integrally formed of resin at the base portion of the resin insertion port, and the second packing seat surface is the inner surface of the receiving port. Are formed by the second packing receiving portion integrally formed with the resin at the end of the resin extending portion that covers the first and second packing seat surfaces. It can be said that it is suitable for use as a seal seat without being processed. Therefore, there is an advantage in terms of work process that it is not necessary to form a packing seat surface having high smoothness by post-processing.

  Moreover, since the structure which clamps packing between the 1st packing seat surface which has a back-up gradient, and the 2nd packing seat surface which has a back-up gradient is employ | adopted, those 1st and 2nd packing of each The seating surface exerts a centering action between the pipes at the connection point between the pipes. Therefore, the alignment action between the pipes at the connection location is easily and reliably exhibited.

  In the present invention, the fastening mechanism includes a first flange provided at an end portion of the outer tube of the first inner surface-coated tube body and a first flange portion provided at an end portion of the bulged cylindrical portion on the second inner surface-coated tube side. Two flanges and a fastener for fastening and coupling the first and second flanges, the first packing receiving portion being in close contact with the first flange, and the first packing receiving portion being the first packing It is desirable to employ a configuration in which the second packing receiving portion is in close contact with the second flange and the second packing receiving portion is backed up by the second flange while being backed up by the flange. If it is this structure, even if each 1st and 2nd packing receiving part is shape | molded with resin inferior to a metal compared with metal, each flange backs up those packing receiving parts, and those deformation | transformation is carried out. To prevent. Therefore, even if the packing is clamped between the first and second packing seats, a situation in which the sealing performance is not impaired by the deformation of the packing receiving portion does not occur.

  In the present invention, it is desirable that the tubular insertion port and the receiving port are loosely fitted with a gap therebetween. When this configuration is adopted, since the inner diameter of the receiving opening is sufficiently larger than the outer diameter of the insertion opening, the work of inserting the insertion opening into the receiving opening can be easily performed, and the connection work is facilitated. Is possible. Nevertheless, since the aligning action described above is exhibited, the pipes are connected with high accuracy at the connection location.

  In the present invention, even if at least one of the first and second inner surface-covered pipe bodies is a pipe joint that is interposed in a connecting portion of a pipe for piping to form a bent pipe line, The long pipe for piping which forms a straight pipe line may be sufficient as at least one of the said inner surface covering pipe body.

  As described above, according to the present invention, the resin extending portion that covers the inner surface of the resin insertion port and the receiving port is formed integrally with the resin coating layer of the first or second inner surface coated tube body. A first packing receiving portion having a first packing seating surface having a rearwardly rising slope is integrally formed with the insertion opening, and a second packing receiving portion having a second packing seating surface having a rearwardly rising slope is the resin. Since the resin is integrally formed with the end portion of the extending portion, it is not necessary to form a packing seat surface having high smoothness by post-processing. Therefore, it becomes possible to provide a sealing property to the connection place without post-processing after the production of the inner surface coated tube, and as a result, a suitable connection structure between the pipe joints and the preference between the long pipe materials. It is possible to provide a simple connection structure.

  Moreover, since the structure which clamps packing between the 1st packing seat surface which has a back-up gradient, and the 2nd packing seat surface which has a back-up gradient is employ | adopted, those 1st and 2nd packing of each Due to the aligning action exerted by the seating surface, the effect that the pipes are easily and reliably connected with high precision at the connection location is also exhibited.

  Further, even if the first and second packing receiving parts are made of resin, the packing receiving parts are packed up by the first or second flange, so that the packing receiving part is not easily deformed. Also, there is an effect that the initial sealing performance can be maintained for a long time.

It is sectional drawing which shows the pipe joint assembled by employ | adopting the connection structure which concerns on embodiment of this invention. FIG. 2 is a view taken along line II in FIG. 1. It is an expanded sectional view of the principal part of FIG. It is sectional drawing which decomposed | disassembled and showed the connection structure of FIG. It is sectional drawing which shows the other pipe joint assembled by employ | adopting the connection structure which concerns on embodiment of this invention. It is sectional drawing which shows the connection structure of the long pipe materials which employ | adopted the connection structure which concerns on embodiment of this invention.

  FIG. 1 is a cross-sectional view showing a pipe joint assembled by adopting a connection structure according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1, and FIG. FIG. 4 is an exploded sectional view of the connection structure of FIG.

  In FIG. 1, reference numeral 10 denotes a first inner surface coated tube body, and 50 denotes a second inner surface coated tube body. A cylindrical insertion opening 20 is provided at an end of the first inner surface coated tube body 10, and the second inner surface A cylindrical receiving port 60 is provided at the end of the coated tube body 50. The insertion port 20 is inserted into the receiving port 60, and the fitting portion of the insertion port 20 and the receiving port 60 is sealed by the seal mechanism 70. Moreover, the 1st and 2nd inner surface covering tubular bodies 10 and 50 are fastened by the fastening mechanism 80 which fastens the said fitting location in a pipe-axis direction.

  As shown in FIG. 3 in an enlarged manner, the first inner surface coated tube body 10 is formed by bringing a first resin coating layer 12 into close contact with the inner surface of an outer tube 11 made of cast iron as an outer tube. The layer 12 prevents internal corrosion of the outer tube 11. And the 1st resin coating layer 12 protrudes to the outer side of the one end part 13 of the outer tube | pipe 11, and the said cylindrical insertion port 20 is formed of the protrusion part. In the illustrated first inner surface coated tube body 10, the thickness of the resin-made insertion port 20 protruding to the outside of the one end portion 13 of the outer tube 11 is increased toward the outer peripheral side, The thickness of the insertion opening 20 is determined to be approximately equal to the thickness obtained by combining the thickness of the outer tube 11 and the thickness of the first resin coating layer 12. If the thickness of the insertion slot 20 is increased in this way, even if the insertion slot 20 is made of resin, it exhibits a high bending resistance, so that it is easy to satisfy the high strength required for the insertion slot 20. In addition, since the diameter of the pipe line surrounded by the first resin coating layer 12 is not narrowed by the insertion opening, the situation that the flow path area is not reduced does not occur.

  On the other hand, as shown in the figure, the second inner surface coated tube 50 is formed by bringing a second resin coating layer 52 into close contact with the inner surface of an outer tube 51 made of cast iron as an outer tube. Internal corrosion of the outer tube 51 is prevented. The receiving port 60 is formed by extending the swelled cylindrical portion 61 formed by extending the outer tube 51 of the second inner surface coated tube body 50 and the second resin coating layer 52. And a cylindrical resin extending portion 62 covering the inner surface of the bulging cylindrical portion 61. The swelled cylindrical portion 61 is formed by subjecting the end portion of the outer tube 51 to a diameter expansion process.

  Next, the seal mechanism 70 includes a first packing receiving portion 71 that is integrally molded with a resin at the root portion of the insertion opening 20 and a second gasket that is integrally molded with a resin at the end of the resin extending portion 62. A packing receiving portion 75 and a packing 78 interposed between the packing receiving portions 71 and 75 are provided. Referring to FIG. 3, the seal mechanism 70 will be described in more detail. The surface of the first packing receiving portion 71 forms a first packing seat surface 72 having a rearward rising gradient. On the other hand, the back surface of the second packing receiving portion 75 forms a second packing seat surface 76 having a rearward rising gradient. Further, the packing 78 has a back-up gradient similar to the first packing seat surface 72 described above, and the inclination angle thereof is equal to that of the first packing seat surface 72. Further, the surface of the packing 78 has a rearward rising gradient similar to the second packing seat surface 76 described above, and the inclination angle thereof is equal to that of the second packing seat surface 76.

  The fastening mechanism 80 is provided at the end of the first flange 81 provided at the end of the outer tube 11 of the first inner surface-covered tube body 10 and the end of the above-described expanded cylindrical portion 61 on the second inner surface-covered tube body 50 side. The second flange 82 and a fastener 83 for fastening and coupling the first and second flanges 81 and 82 are provided. FIG. 2 shows the front shape of the first flange 81. As can be seen from the figure, the first flange 81 is formed in an annular shape, and has bracket portions 85 having bolt insertion holes 84 at three positions around the circumference thereof at equal angles. Although not shown, the second flange 82 has the same configuration as the first flange 81. In FIG. 3, the bracket portion of the second flange 82 is denoted by reference numeral 87, and the bolt insertion hole of the bracket portion 87 is denoted by reference numeral 86. The illustrated fastener 83 includes a fastening bolt 88 inserted into the bolt insertion holes 84 and 86 of the first and second bracket portions 85 and 87, and a nut 89 screwed into the fastening bolt 88. is doing.

  As shown in FIG. 1 or FIG. 3, the first packing receiving portion 71 is in close contact with the first flange 81, and the first packing receiving portion 71 is backed up by the first flange 81. Similarly, the second packing receiving portion 75 is in close contact with the second flange 82, and the second packing receiving portion 75 is backed up by the second flange 82. Therefore, the first packing receiving portion 71 and the second packing receiving portion 75 do not bend and deform due to the tightening force of the fastening mechanism 80 described later.

  In this embodiment, the first resin coating layer 12 of the first inner surface coated tubular body 10, the insertion opening 20 extending from the first resin coating layer 12, and the first packing receiving portion at the root portion of the insertion opening 20 71 is insert-molded in the outer tube 11 having the first flange 81. Moreover, the 1st resin coating layer 12 and the 1st packing receiving part 71 are joined to the outer tube | pipe 11 and the 1st flange 81 via the adhesive agent.

  At the connection location between the first inner surface coated tube body 10 and the second inner surface coated tube body 50, the insertion port 20 of the first inner surface coated tube body 10 is inserted into the receiving port 60 of the second inner surface coated tube body 50, The insertion port 20 and the receiving port 60 are loosely fitted to each other with a gap indicated by a symbol S in FIG. By having this structure, the insertion port 20 can be easily inserted into the receiving port 60 and the insertion workability is improved.

  Further, the packing 78 is sandwiched between the first packing seat surface 72 of the first packing receiving portion 71 and the second packing seat surface 76 of the second packing receiving portion 75 so that the fastening mechanism 80 is tightened. It is clamped between the first and second packing seat surfaces 72 and 76 by the applied force. Here, the 1st packing seat surface 72 is formed of the surface of the 1st packing receiving part 71 integrally formed with resin at the base part of the insertion opening 20 made of resin. Similarly, the second packing seating surface 76 is formed by the back surface of the second packing receiving portion 75 that is integrally molded with resin at the end of the resin extending portion 62. For the packing seat surfaces 72 and 76, the smooth surface after molding the first packing receiving portion 71 and the smooth back surface after molding the second packing receiving portion 75 are used as they are. Therefore, it is not necessary to go through a special polishing process to form the packing seat surfaces 72 and 76.

  Further, in this embodiment, since the packing 78 is sandwiched between the first packing seat surface 72 having the rearward rising gradient and the second packing seating surface 76 having the rearward rising gradient, Each of the first and second packing seat surfaces 72 and 76 exhibits a centering action between the pipes at the connection portion between the first and second inner surface-coated pipes 10 and 50, and the first and second The inner surface coated tube bodies 10 and 50 are useful for concentric connection.

  Note that the rear end portion of the first inner surface-coated tube body 10 and the front end portion of the second inner surface-coated tube body 50 are provided with connection ports 15 and 55 to which pipe materials for forming a piping system are connected.

  1 to 4 show a connection structure of the first and second inner surface covering pipe bodies 10 and 50 having curved pipe lines, and the first and second inner surface coverings thus connected are shown. The pipe bodies 10 and 50 cooperate to constitute a right angle elbow type pipe joint.

  The connection structure of the inner surface coated tube according to the present invention is not limited to the case of constituting a right angle elbow type pipe joint described with reference to FIGS. can do. FIG. 5 shows an example in which the inner surface-coated tube connecting structure according to the present invention is used to construct a Y-type pipe joint.

  That is, FIG. 5 is a cross-sectional view showing another pipe joint assembled by employing the connection structure according to the embodiment of the present invention. The illustrated pipe joint is a Y-type pipe joint, and its branch pipe portion 90 is divided into a root-side portion 91 and a tip-side portion 92, and the above-described connection structure is applied to those connection locations. In this embodiment, the tip side portion 92 of the branch pipe portion 90 corresponds to the first inner surface coated tube body 10 of the present invention, and the root side portion 91 of the branch tube portion 90 corresponds to the second inner surface coated tube body 50 of the present invention. Corresponds. And the front end side part 92 of the branch pipe part 90 has the same whole structure as the 1st inner surface covering pipe body 10 shown in FIG. Since the connection structure is the same as that described with reference to FIGS. 1 and 3, etc., the same or corresponding parts are denoted by the same reference numerals in order to avoid duplication of description, and detailed description will be given. Omitted.

  The connection structure of the inner surface coated tube according to the present invention can also be applied to a connection portion between long pipe members. That is, FIG. 6 is a cross-sectional view showing a connection structure between long pipe members adopting the connection structure according to the embodiment of the present invention. In this embodiment, the pipe material 93 on one side corresponds to the first inner surface coated tube body 10 of the present invention, and the pipe material 94 on the other side corresponds to the second inner surface coated tube body 50 of the present invention. Since the connection structure of both pipe members 93 and 94 is the same as that described with reference to FIGS. 1 and 3, etc., the same reference numerals are assigned to the same or corresponding parts in order to avoid duplication of description. Therefore, detailed description is omitted.

Claims (3)

The insertion opening provided in the first inner surface coated tube, the receiving port provided in the second inner surface coated tube and the insertion port inserted inward, and the fitting portion of the insertion port and the receiving port are sealed. And a fastening mechanism for fastening the first and second inner surface coated pipes by fastening the fitting part in the tube axis direction,
The insertion opening is formed in a cylindrical shape by projecting the first resin coating layer provided in the first inner surface coated tube body to the outside of the end portion of the outer tube of the first inner surface coated tube body,
The receiving port of the second inner surface-covered tube body includes an expanded cylindrical portion formed by extending an outer tube of the second inner surface-covered tube body, and a second resin provided in the second inner surface-covered tube body. Formed by extending a coating layer and formed by a cylindrical resin extending portion covering the inner surface of the bulging cylindrical portion,
A first packing receiving portion in which the sealing mechanism is integrally formed with a resin at a base portion of the cylindrical insertion opening to form a first packing seating surface having an upward gradient; and the cylindrical resin extending portion. Between the packing seating surfaces of the first and second packing receiving portions and the second packing receiving portions which are integrally molded with resin at the end portions of the first packing forming the second rising packing seating surface. And a packing structure sandwiched between the inner surface-covered tube body and the inner surface-coated tube body. The fastening mechanism includes a first flange provided at an end of the outer tube of the first inner surface-coated tube, a second flange provided at an end of the bulged cylindrical portion on the second inner surface-coated tube, A fastener that clamps and couples the first and second flanges;
The first packing receiver is in close contact with the first flange and the first packing receiver is backed up by the first flange, and the second packing receiver is in close contact with the second flange. The connection structure of the inner surface coated tube body according to claim 1, wherein the two packing receiving portions are backed up by the second flange.   The connection structure of the inner surface coated tube body according to claim 1 or 2, wherein the tubular insertion port and the receiving port are loosely fitted with a gap therebetween.

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