JP2014029172A - Flange type pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flange type pipe joint capable of preventing separation of an anticorrosion core from a flange body, and simplifying a process for integrating the anticorrosion core with the flange body.SOLUTION: A flange type pipe joint includes a flange body 10 and an anticorrosion core 12. The flange body 10 has an outer cylinder portion 20 and a flange collar portion 22. A cutoff is formed on an opening edge of an end portion of the outer cylinder portion 20 while surrounding the opening. The outer cylinder portion 20 has a female screw. The flange collar portion 22 is disposed on the end portion of the outer cylinder portion 20. The anticorrosion core 12 has an inner cylinder portion and a core collar portion. The inner cylinder portion is inserted into the outer cylinder portion 20 of the flange body 10. The core collar portion is disposed on an end portion of the inner cylinder portion. The core collar portion is fitted to the cutout of the flange body 10. The outer cylinder portion 20 has a recessed portion at its inner periphery. The anticorrosion core 12 further has a retaining portion. The retaining portion is disposed on a boundary portion between the inner cylinder portion and the core collar portion. The retaining portion is fitted to the recessed portion.

Description

  The present invention relates to a flange type pipe joint.

  Patent document 1 discloses a flange type pipe joint. This flange-type pipe joint includes a tapered female thread portion and a flange portion. The taper female thread part meshes with the taper male thread part at the end of the steel pipe. The flange is tightened with bolts. The flange-type pipe joint further includes a left female thread portion. A resin anticorrosion core engages with the left female screw portion. The anticorrosion core includes a collar portion, a left male screw portion, and a cylindrical portion. A gap is formed between the outer peripheral surface of the cylindrical portion and the tapered female screw portion. The steel pipe end is sandwiched between the gaps. An elastic ring is disposed at a location corresponding to the bottom of the gap. According to the flange-type pipe joint disclosed in Patent Document 1, corrosion of the joint portion in the steel pipe can be prevented.

  Patent document 2 discloses a flange type pipe joint. This flange type pipe joint includes a flange body. A pipe taper female screw and an incomplete female screw are provided on the inner peripheral surface of the flange body. The incomplete female thread is disposed on the small diameter side of the pipe taper female thread. The incomplete female thread is continuous with the pipe taper female thread. The incomplete female screw is a taper female screw whose inner diameter portion on the small diameter side is cut off. A resin anticorrosion core is formed so as to cover the incomplete female screw, the annular jetty, and the notch. According to the flange-type pipe joint disclosed in Patent Document 2, when the steel pipe is screwed and connected, the resin core does not come off from the main body. According to the flange-type pipe joint disclosed in Patent Document 2, even when the resin core is injection-molded, the molten resin in the core portion does not protrude from the female screw portion for connection with the pipe.

JP 7-71666 A JP-A-8-303660

  The flange-type pipe joint disclosed in Patent Document 1 has a problem that when a steel pipe is screwed and connected to a tapered female thread portion, the anticorrosion core rotates together with the steel pipe due to the screwing force of the steel pipe. When the anticorrosion core rotates together with the steel pipe, the anticorrosion core comes off from the left female screw portion.

  The flange-type pipe joint disclosed in Patent Document 2 has a problem that it takes time to inject and mold the resin core. This is because the mold needs to be in close contact with the flange body.

  The present invention has been made to solve this problem. An object of the present invention is to provide a flange-type pipe joint that can prevent the anticorrosion core from coming off from the flange main body and can simplify the process of integrating the anticorrosion core and the flange main body.

  The flange type pipe joint of the present invention will be described with reference to the drawings. The reason why the symbols in the figure are used in this column is to help understand the content of the invention. The use of the symbols in the figure in this column is not intended to limit the scope of the invention to the scope shown.

  In order to achieve the above-described object, according to an aspect of the present invention, the flange-type pipe joint includes a flange body 10 and an anticorrosion core 12. The flange main body 10 includes an outer cylinder portion 20 and a flange flange portion 22. A notch 32 surrounding the opening 40 is provided at the edge of the opening 40 at the end of the outer cylindrical portion 20. The outer cylinder part 20 has a female screw 30. The flange flange 22 is provided at the end of the outer cylinder 20. The anticorrosion core 12 has an inner cylinder part 60 and a core collar part 62. The inner cylinder part 60 is inserted into the outer cylinder part 20 of the flange body 10. The core collar 62 is provided at the end of the inner cylinder 60. The core flange 62 fits into the notch 32 of the flange body 10. The outer cylinder part 20 has the recessed part 34 in an inner periphery. The anticorrosion core 12 further has a retaining portion 64. The retaining portion 64 is disposed at a boundary portion between the inner cylinder portion 60 and the core flange portion 62. The retaining portion 64 fits into the recess 34.

  The flange body 10 and the anticorrosion core 12 are integrated by fitting the retaining portion 64 into the recess 34. Thereby, it can prevent that the anticorrosion core 12 remove | deviates from the flange main body 10. FIG. Compared with the case where the anticorrosion core 12 is injection-molded after the mold is brought into close contact with the flange main body 10, the integration process is simplified. In addition, the retaining portion 64 is disposed at the boundary portion between the inner tube portion 60 and the core flange portion 62. Thereby, when the flange main body 10 and the anticorrosion core 12 are integrated, the end portion of the inner cylinder portion 60 opposite to the side where the retaining portion 64 is disposed is not easily deformed. If the end of the inner cylindrical portion 60 opposite to the side where the retaining portion 64 is disposed is difficult to deform, the possibility of difficulty in connecting the pipe to the flange-type pipe joint is reduced.

  Further, it is desirable that the retaining portion 64 described above has at least three surrounding pieces 90. The surrounding pieces 90 are separated from each other so that a gap 92 is formed.

  Since the retaining portion 64 has at least three surrounding pieces 90 and a gap 92 is formed between them, the retaining portion 64 is more likely to be squeezed than when there is no such clearance 92. . In addition, since the retaining portion 64 has at least three surrounding pieces 90, when the retaining portion 64 is narrowed, the retaining portions 64 are retained by the gaps 92 at both ends of the adjacent surrounding pieces 90 and the gaps 92 between the surrounding pieces 90. The part 64 is easily bent. Since it becomes easy to bend, the retaining portion 64 is likely to be narrowed.

  Alternatively, it is desirable that the above-described at least three surrounding pieces 90 are disposed so as to surround the outer periphery of the inner cylindrical portion 60.

  When the surrounding piece 90 surrounds the outer periphery of the inner cylinder portion 60, when the retaining portion 64 is bent by the gap 92 at both ends of the surrounding pieces 90 adjacent to each other and the gap 92 between the surrounding pieces 90, the retaining portion 64 becomes large. It becomes easy to bend. Since the retaining portion 64 is large and easily bends, the retaining portion 64 is well squeezed.

  ADVANTAGE OF THE INVENTION According to this invention, it can prevent that a corrosion-proof core remove | deviates from a flange main body, and can simplify the process of integrating a corrosion-proof core and a flange main body. According to this invention, possibility that it will become difficult to connect a pipe | tube to a flange type pipe joint falls.

It is sectional drawing of the flange type pipe joint concerning embodiment of this invention. It is an external view of the flange main body concerning embodiment of this invention. It is an external view of the anticorrosion core concerning embodiment of this invention. It is a top view of the anticorrosion core concerning the embodiment of the present invention. It is an external view of the surrounding piece concerning embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

[Description of structure]
FIG. 1 is a cross-sectional view of a flange-type pipe joint according to this embodiment. Based on FIG. 1, the structure of the flange type pipe joint concerning this embodiment is demonstrated. The flange-type pipe joint according to this embodiment includes a flange main body 10 and a corrosion-proof core 12. The flange main body 10 includes an outer cylinder portion 20 and a flange flange portion 22. A steel pipe (not shown) is inserted into one end of the outer cylinder part 20. The anticorrosion core 12 is inserted into the outer cylinder part 20 from the other end. The tip of the steel pipe enters between the outer tube portion 20 and the anticorrosion core 12. The flange flange 22 is fastened with a bolt (not shown).

  FIG. 2 is an external view of the flange main body 10 according to the present embodiment. In FIG. 2, a part of the flange body 10 is removed. Based on FIG. 2, the structure of the flange main body 10 concerning this embodiment is demonstrated. As described above, the flange main body 10 includes the outer cylinder portion 20 and the flange flange portion 22. The outer cylinder portion 20 has a female screw 30, a notch 32, and a recess 34. In the present embodiment, the female screw 30 is a taper screw. In the case of this embodiment, a male screw is provided on the outer peripheral surface of the steel pipe inserted into the outer cylinder portion 20. This male screw is also a taper screw. The female screw 30 engages with the male screw. As is clear from FIG. 2, the notch 32 is provided at the edge of the opening 40 on the other end side (side on which the anticorrosion core 12 is inserted) of the outer cylinder portion 20. As is clear from FIG. 2, the notch 32 surrounds the opening 40. The concave portion 34 is disposed between the opening 40 and the female screw 30 in the inner periphery of the outer cylinder portion 20. The inner diameter of the recess 34 is larger than the inner diameter of the female screw 30 (in this embodiment, the inner diameter of the female screw 30 where the inner diameter is the smallest). The flange flange portion 22 is provided at the end portion on the other end side of the outer cylinder portion 20. The flange flange portion 22 protrudes from the end portion of the outer cylinder portion 20. The flange flange 22 has a bolt hole 50. A bolt (not shown) passes through the bolt hole 50.

  FIG. 3 is an external view of the anticorrosion core 12 according to the present embodiment. In FIG. 3, a part of the anticorrosion core 12 is removed. Based on FIG. 3, the structure of the anticorrosion core 12 concerning this embodiment is demonstrated. The anticorrosion core 12 has an inner cylinder part 60, a core flange part 62, and a retaining part 64. The inner cylinder part 60 is inserted into the outer cylinder part 20 of the flange body 10. The core collar part 62 is provided so as to protrude from the inner cylinder part 60. The core flange 62 fits into the notch 32 of the flange body 10. The shape of the core flange 62 is a ring shape. The retaining portion 64 is disposed at a boundary portion between the inner cylinder portion 60 and the core flange portion 62. The retaining portion 64 fits into the concave portion 34 of the flange main body 10.

  The inner cylinder part 60 includes a body part 70, a plurality of ribs 72, a lip 74, and a seal groove 76. The body 70 has a cylindrical shape. One end portion (the end portion on the side inserted into the outer tube portion 20) of the body portion 70 has a smaller outer diameter than the other end portion (the end portion on the side where the core flange portion 62 is provided). The rib 72 is disposed on the inner peripheral surface of the body portion 70. The lip 74 is provided so as to protrude from the outer peripheral surface of one end portion of the body portion 70. The lip 74 is provided over the entire outer peripheral surface of the body 70. The seal groove 76 is provided adjacent to the lip 74. An O-ring 80 is fitted in the seal groove 76.

  FIG. 4 is a plan view of the anticorrosion core 12 according to the present embodiment. Based on FIG. 3 and FIG. 4, the structure of the retaining part 64 concerning this embodiment is demonstrated. The retaining portion 64 according to the present embodiment protrudes in the radial direction (the direction from the central axis of the body portion 70 toward the outer peripheral surface of the body portion 70) from the outer periphery of the inner cylinder portion 60 (specifically, the body portion 70). . The retaining portion 64 according to the present embodiment has four surrounding pieces 90. These surrounding pieces 90 are arrange | positioned so that the outer periphery of the inner cylinder part 60 (specifically trunk | drum 70) may be surrounded. These surrounding pieces 90 are separated from each other so that a gap 92 is formed.

  FIG. 5 is an external view of the surrounding piece 90 according to the present embodiment. Based on FIG. 5, the structure of the surrounding piece 90 concerning this embodiment is demonstrated. The surrounding piece 90 has a constricted surface 100 and a catching surface 102. The constricted surface 100 narrows as it approaches one end of the inner cylinder 60 (the end on the side inserted into the outer cylinder 20). The hooking surface 102 is disposed on the other end portion (the end portion on the side where the core flange portion 62 is provided) side of the inner cylindrical portion 60 when viewed from the constricted surface 100. The hooking surface 102 is hooked on the inner wall of the concave portion 34 of the outer cylinder portion 20.

[Description of assembly method]
The method for assembling the flange-type pipe joint according to the present embodiment is as follows. First, the inner cylinder part 60 of the anticorrosion core 12 is inserted into the outer cylinder part 20 of the flange body 10. The insertion of the inner cylinder part 60 into the outer cylinder part 20 may be performed by a device or manually. When the inner cylinder part 60 is inserted into the outer cylinder part 20, one end part (outer cylinder part) is formed on the other end part (the end part on the side where the core flange part 62 is provided) of the inner cylinder part 60 of the anticorrosion core 12. The force in the direction of the end portion on the side to be inserted into 20 is applied. This force may be applied by a device or may be applied manually. The retaining portion 64 receiving this force is narrowed. This is because a gap 92 exists between the surrounding pieces 90. The fact that the surrounding piece 90 has the constricted surface 100 promotes constriction of the retaining portion 64. The narrowed retaining portion 64 faces the recess 34 after passing through the opening 40. When the retaining portion 64 faces the recess 34, the retaining portion 64 returns to its original shape. Along with this, the retaining portion 64 fits into the recess 34. The hooking surface 102 of the surrounding piece 90 is hooked on the inner peripheral surface of the recess 34. At the same time, the core flange 62 of the anticorrosion core 12 fits into the notch 32 of the flange body 10. Thereby, the assembly of the flange type pipe joint is completed.

[Description of usage]
The method of using the flange-type pipe joint according to this embodiment is the same as the method of using a conventionally known flange-type pipe joint. Therefore, detailed description thereof will not be repeated here.

[Effect of flange-type pipe joint according to this embodiment]
According to the flange-type pipe joint according to the present embodiment, the anticorrosion core 12 can be prevented from being detached from the flange main body 10, and the process of integrating the anticorrosion core 12 and the flange main body 10 can be simplified. According to the flange-type pipe joint according to the present embodiment, when the flange main body 10 and the anticorrosion core 12 are integrated, one end portion of the inner cylinder portion 60 (the end portion on the side inserted into the outer cylinder portion 20) is deformed. It becomes difficult to do. According to the flange-type pipe joint according to the present embodiment, when the retaining portion 64 is narrowed, the retaining portion 64 is bent by the gap 92 at both ends of the surrounding pieces 90 adjacent to each other and the gap 92 between the surrounding pieces 90. It becomes easy. Since it becomes easy to bend, the retaining portion 64 is likely to be narrowed. According to the flange-type pipe joint according to the present embodiment, the surrounding piece 90 surrounds the outer periphery of the inner cylindrical portion 60, so that the retaining portion 64 is easily bent. Since the retaining portion 64 is large and easily bends, the retaining portion 64 is well squeezed.

<Description of modification>
The embodiments disclosed herein are illustrative in all respects. The scope of the present invention is not limited based on the above-described embodiment, and various design changes may be made without departing from the spirit of the present invention.

  For example, the number of surrounding pieces 90 included in the retaining portion 64 is not limited to four. The number of surrounding pieces 90 may be three or less. The number of surrounding pieces 90 may be five or more. The surrounding piece 90 does not need to surround the outer periphery of the inner cylinder part 60. That is, the surrounding piece 90 may be arranged in a part of the outer periphery of the inner cylinder part 60. The form of the retaining portion 64 is not limited to that described above. The female screw 30 of the outer cylinder part 20 of the flange main body 10 may be a parallel female screw.

DESCRIPTION OF SYMBOLS 10: Flange main body 12: Corrosion-proof core 20: Outer cylinder part 22: Flange collar part 30: Female screw 32: Notch 34: Recess 40: Opening 50: Bolt hole 60: Tube part 62: Core collar part 64: Stop part 70 : Barrel portion 72: rib 74: lip 76: seal groove 80: O-ring 90: surrounding piece 92: gap 100: constricted surface 102: catching surface

Claims (3)

An outer cylinder portion having a female screw provided with a notch surrounding the opening at the edge of the opening of the end portion, and a flange main body having a flange flange portion provided at the end portion of the outer cylinder portion;
A flange-type pipe joint comprising: an inner cylinder part inserted into the outer cylinder part of the flange main body; and an anticorrosion core having a core flange part provided at an end of the inner cylinder part and fitted into the notch. And
The outer cylinder part has a recess in the inner periphery;
The flange-type pipe joint, wherein the anticorrosion core further has a retaining portion that is disposed at a boundary portion between the inner cylinder portion and the core flange portion and fits into the concave portion.   The flange-type pipe joint according to claim 1, wherein the retaining portion has at least three surrounding pieces that are separated from each other so that a gap is formed.   The water drainer according to claim 2, wherein the at least three surrounding pieces are arranged so as to surround an outer periphery of the inner cylinder portion.

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