JP2008057593A - Loose flange type pipe coupling - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a loose flange type pipe coupling capable of being assembled safely and easily which is stable in quality. <P>SOLUTION: A first pipe part 31 of a coupling main body 30 having a first fix flange part 32 is inserted to a through hole 21 of the loose flange part 20. A first threaded part 33 is formed at an end of a fist pipe 31. As a second threaded part 44 of a tip end part of a second pipe part 42 provided to a second fix flange part 40 is fixed to the first threaded part 33, the loose flange type pipe coupling 10 of which loose flange part 20 is capable of rotating and moving on the first pipe part 31 is formed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pipe joint, and more particularly to a loose flange type pipe joint.

  When it is necessary to connect pipes in piping systems such as water supply piping, sewage piping, gas piping, and air conditioning piping for water supply and fire fighting facilities, pipe fittings are used. This pipe joint is usually provided with a cylindrical main body and flange portions provided at both ends of the main body. When connecting pipes using this pipe joint, fix the flange part provided at the end of one pipe and the flange part provided at one end of the pipe joint using bolts and nuts, The flange provided at the end of the other pipe and the flange provided at the other end of the pipe joint are fixed using bolts and nuts. Thereby, one piping and the other piping will be connected on both sides of a pipe joint.

  In this case, first, one flange part of the pipe joint is fixed to the flange part of one pipe, and then the other flange part of the pipe joint is fixed to the flange part of the other pipe. However, when one flange portion is fixed to the flange portion of one pipe, the bolt hole of the other flange portion of the pipe joint does not match the bolt hole of the flange portion of the other pipe, and the pipe joint is fixed to the other pipe portion. It may become impossible to fix to the piping. Therefore, a loose flange type pipe joint capable of coping with such a situation has been put into practical use.

  An example of a loose flange type pipe joint is shown in FIG. In the figure, a loose flange-type pipe joint 1 is mainly composed of a disc-shaped first flange portion 3 having a through hole 2 at the center, a cylindrical joint body 5 having a small-diameter flange portion 4 at one end, and one end. A joint body 5 having a second flange portion 6 and a short pipe 7 having the same outer diameter and inner diameter are provided. And the coupling main body 5 is inserted in the through-hole 2 of the 1st flange part 3, and the other end 5a of the coupling main body 5 and the other end 7a of the short tube 7 are joined.

  When manufacturing such a loose flange-type pipe joint 1, the other end 5 a of the joint body 5 and the short pipe 7 are usually inserted with the joint body 5 inserted into the through hole 2 of the first flange portion 3. Glue the end 7a. Here, when the loose flange type pipe joint 1 is made of metal, the joint body 5 and the short pipe 7 are usually bonded by welding. Moreover, when the loose flange type pipe joint 1 is made of resin, the joint body 5 and the short pipe 7 are usually bonded by thermal fusion (for example, Patent Document 1). For this reason, in the loose flange type pipe joint 1, a joint part 8 is formed at an adhesive part between the joint body 5 and the short pipe 7.

JP 11-153274 A

  By the way, the loose flange type pipe joint 1 is often manufactured as necessary at the site of piping work. That is, the above-mentioned first flange part 3, the joint body 5 and the short pipe 7 are prepared separately, and the loose flange type pipe joint 1 can be manufactured by combining these members at the piping work site as necessary. Many. In this case, since it is necessary to bond the joint body 5 and the short pipe 7 by welding or heat fusion at the piping construction site, it takes time for manufacturing, and it is necessary to bring the equipment for that purpose into the piping construction site. . In the case of welding, since a flame is used at the piping construction site, it is necessary to ensure the safety of the working environment. In addition, in the case of heat fusion, it is necessary to secure an energy source such as electric energy required for that purpose at the piping construction site.

  Furthermore, in the loose flange type pipe joint 1 manufactured as described above, since the quality of the joint portion 8 is difficult to be constant depending on the technique and skill of the operator, problems such as the occurrence of leakage at the joint portion 8 are likely to occur.

  An object of the present invention is to realize a loose flange type pipe joint that can be assembled safely and easily and has a stable quality.

  The loose flange-type pipe joint according to the present invention includes a circular through hole provided in a central portion, and a plurality of first bolts arranged at intervals on a circumference coaxial with the through hole and opened in the thickness direction. Disc-shaped loose flange portion having a hole, a first fixed flange portion having a diameter larger than the through-hole of the loose flange portion at one end, and a loose flange portion having a first spiral portion at the other end A joint body composed of a cylinder having a smaller diameter than the hole, and a second spiral part corresponding to the first spiral part in the center part, arranged at intervals on a circumference coaxial with the joint body, and in the thickness direction A disc-shaped second fixing flange portion having a plurality of second bolt holes that are open to the surface. Here, the joint main body is inserted into the through hole of the loose flange portion, and the second fixing flange portion is fixed to the joint main body by screwing the first spiral portion and the second spiral portion. .

  This loose flange type pipe joint can be easily and simply inserted by inserting the joint body into the through hole of the loose flange section and screwing the first spiral section of the joint body and the second spiral section of the second fixed flange section. It can be manufactured safely. Moreover, since the joint part of a joint main body and a 2nd fixing flange part is based on a screw stop, quality is stabilized and it is hard to produce malfunctions, such as leak generation.

  In this loose flange type pipe joint, the second fixed flange portion usually has a tube portion protruding at the center portion, and the second spiral portion is formed in the tube portion. In the loose flange type pipe joint, the first spiral portion is an outer spiral and the second spiral portion is an inner spiral, or the first spiral portion is an inner spiral and the second spiral is The part is an outer spiral.

  The joint body of the loose flange type pipe joint has, for example, a branch pipe that protrudes inward and has an inner surface formed with a spiral, and the branch pipe is formed integrally with the joint body. Moreover, the joint main body has a spiral hole on the surface, for example.

  The loose flange type pipe joint main body of the present invention includes a cylindrical pipe part, a flange part integrally formed at one end of the pipe part, and a spiral part formed at the other end of the pipe part.

  Since this loose flange type pipe joint body has a spiral portion at the end of the pipe part, it can be used as a member for the loose flange type pipe joint of the present invention.

  In this loose flange type pipe joint main body, the pipe part integrally has, for example, a branch pipe that protrudes inward and has an inner surface formed with a spiral. Moreover, the pipe part has a spiral hole on the surface, for example.

  Since the loose flange type pipe joint of the present invention includes the above-described members, it can be assembled safely and easily, and the quality is stable.

  With reference to FIG. 1 and FIG. 2, one form of the loose flange type pipe joint of this invention is demonstrated. In the figure, the loose flange-type pipe joint 10 mainly includes a loose flange part 20, a joint body 30, and a second fixed flange part 40.

  The loose flange portion 20 is a disk-shaped member and has a circular through hole 21 centered on the axis thereof. Further, in the vicinity of the outer periphery of the loose flange portion 20, there are formed a plurality of first bolt holes 22 that are arranged on the circumference coaxial with the through-hole 21 and arranged at a constant interval and open in the thickness direction. .

  The joint body 30 includes a first pipe portion 31 having both ends opened to a cylindrical shape whose outer diameter D2 is slightly smaller than the diameter D1 of the through hole 21 of the loose flange portion 20, and a first pipe portion. The first fixing flange portion 32 formed integrally at one end of the main portion 31 is mainly included. The first fixed flange portion 32 protrudes outward from one end of the first tube portion 31 in the vertical direction of the axial direction, and has an outer diameter D3 larger than the through hole 21. However, the outer diameter D3 is set to be smaller than the diameter D4 of the circle connecting the end portions on the through hole 21 side of each first bolt hole 22 in the loose flange portion 20.

  A first spiral portion 33 is formed at the other end of the first tube portion 31. The first spiral portion 33 is an outer spiral formed on the outer peripheral surface of the other end of the first tube portion 31.

  The second fixed flange portion 40 mainly includes a flange main body 41 and a second pipe portion 42. The flange main body 41 is formed in a disc shape, and a plurality of second openings that open in the thickness direction are arranged in the vicinity of the outer periphery of the flange main body 41 at regular intervals on the circumference centered on the axis. Bolt holes 43 are formed. The second pipe portion 42 is formed in a cylindrical shape coaxial with the flange main body 41 and has the same outer diameter and inner diameter as the first pipe portion 31 of the joint main body 30, and protrudes from the flange main body 41. ing. A second spiral portion 44 corresponding to the first spiral portion 33 is formed at the distal end portion of the second tube portion 42. The second spiral portion 44 is an inner spiral formed on the inner peripheral surface of the second pipe portion 42.

  In the second fixed flange portion 40, the flange main body 41 and the second pipe portion 42 are integrally formed, and a series of through holes 45 extending in the axial direction are formed.

  In the loose flange-type pipe joint 10, the first pipe part 31 of the joint body 30 is inserted into the through hole 21 of the loose flange part 20. Further, the second fixing flange portion 40 is fixed to the joint body 30 by a screwing of the second spiral portion 44 and the first spiral portion 33 of the joint body 30. As a result, in the loose flange-type pipe joint 10, a series of flow paths 50 (FIG. 1) having both ends opened by the connection of the first pipe portion 31 and the second pipe portion 42 are formed, and the loose flange portion 20. Can be rotated around the first pipe portion 31 and can be freely moved in the direction of the arrow in FIG.

  In the loose flange type pipe joint 10, all members of the loose flange portion 20, the joint body 30 and the second fixed flange portion 40 are usually made of metal or resin. Therefore, the joint main body 30 and the second fixed flange portion 40 are integrally formed by casting or integral molding.

  In such a loose flange type pipe joint 10, after the first pipe portion 31 of the joint main body 30 is inserted into the through hole 21 of the loose flange portion 20, the second fixed flange is set against the first spiral portion 33 of the joint main body 30. Since the second spiral portion 44 of the portion 40 can be easily assembled by screwing, the quality is stable compared to the conventional one that requires welding work and heat fusion work at the time of assembly. Problems such as leakage are less likely to occur at the joint portion with the two fixed flange portions 40.

  In addition, if several types of joint main bodies 30 with different lengths of the first pipe portion 31 are prepared, the length of the loose flange-type pipe joint 10 can be adjusted by selecting these joint main bodies 30.

  Next, with reference to FIG. 2, the usage method of the loose flange type pipe joint 10 is demonstrated.

  The loose flange type pipe joint 10 is used, for example, for connecting pipes in a piping system such as a water supply pipe, a sewage pipe, a gas pipe, and an air conditioning pipe for water supply or fire fighting equipment. Specifically, it is used to connect the first pipe 60 and the second pipe 70 in a discontinuous state. In addition, the 1st piping 60 and the 2nd piping 70 have the flange parts 62 and 72 which have the bolt holes 61 and 71 in the edge part by the side connected by the loose flange type pipe joint 10, respectively.

  The loose flange type pipe joint 10 may be assembled in advance or may be assembled at a piping work site. In the latter case, if several kinds of joint bodies 30 having different lengths of the first pipe portion 31 are prepared at the piping work site, the joint body 30 is selected according to the distance between the first pipe 60 and the second pipe 70. Then, the loose flange type pipe joint 10 having an appropriate length can be assembled.

  When connecting the first pipe 60 and the second pipe 70 while assembling the loose flange-type pipe joint 10 at the piping work site, the first pipe part 31 of the joint body 30 is inserted into the through hole 21 of the loose flange part 20. Subsequently, the loose spiral pipe joint 10 is assembled by screwing the second spiral portion 44 of the second fixed flange portion 40 to the first spiral portion 33 of the joint body 30. And the 2nd fixed flange part 40 of the loose flange type pipe joint 10 assembled in this way and the flange part 62 by the side of the 1st piping 60 are contact | abutted, and are combined. Here, first, the plurality of second bolt holes 43 of the second fixed flange portion 40 and the plurality of bolt holes 61 of the flange portion 62 are aligned. Then, a bolt (not shown) is inserted into a series of bolt holes formed thereby, and tightened with a nut (not shown).

  Next, the first fixed flange portion 32 of the loose flange-type pipe joint 10 is brought into contact with the flange portion 72 on the second pipe 70 side. And the loose flange part 20 and the flange part 72 by the side of the 2nd piping 70 are combined in this state. Here, first, the plurality of first bolt holes 22 and the flange portions 72 of the loose flange portion 20 are rotated while the loose flange portion 20 is in contact with the first fixed flange portion 32 and appropriately rotated around the first pipe portion 31. The plurality of bolt holes 71 are aligned. Then, a bolt (not shown) is inserted into a series of bolt holes formed thereby, and tightened with a nut (not shown). Thereby, the 1st piping 60 and the 2nd piping 70 are mutually connected on both sides of the loose flange type pipe joint 10. As shown in FIG.

  The loose flange-type pipe joint 10 according to the above-described embodiment can be modified as follows, for example.

(1) With reference to FIG. 3, the 2nd fixing flange part of the other form which can be utilized in the loose flange type pipe joint 10 which concerns on the above-mentioned embodiment is demonstrated. In the figure, the second fixed flange portion 400 is a disk-like member, and has a circular through hole 410 centered on the axis thereof. A second spiral portion 440 that is an inner spiral corresponding to the first spiral portion 33 of the joint body 30 is formed on the inner peripheral surface of the through hole 410. Further, in the vicinity of the outer periphery of the second fixed flange portion 400, a plurality of second bolt holes 430 that are arranged at a constant interval on a circumference coaxial with the through-hole 410 and that open in the thickness direction are formed. ing.

  The second fixing flange portion 400 can be integrated with the joint body 30 by screwing the second spiral portion 440 to the first spiral portion 33 of the joint body 30.

(2) In the loose flange type pipe joint 10 according to the above-described embodiment, the second spiral formed in the second pipe part 42 of the second fixed flange part 40 using the first spiral part 33 of the joint body 30 as an outer spiral. Although the portion 44 is an inner spiral, the relationship between these spirals may be reversed. That is, the first spiral portion 33 may be an inner spiral and the second spiral portion 44 may be an outer spiral.

(3) With reference to FIG. 4, the joint main body 30 of the other form used in the loose flange type pipe joint 10 which concerns on the above-mentioned embodiment is demonstrated. FIG. 4 is a diagram corresponding to FIG. 1, and the same components as those in FIG. The joint main body 30 in this form has a branch pipe 80 that protrudes inward of the first pipe portion 31. The branch pipe 80 is formed integrally with the first pipe portion 31 and has a spiral 81 formed on the inner surface.

  The loose flange type pipe joint 10 using such a joint body 30 is provided with a part 82 such as a pressure valve or a drain valve provided with a corresponding spiral portion as shown by a one-dot chain line in FIG. Can be installed.

(4) With reference to FIG. 5, the coupling main body 30 of the other form used in the loose flange type pipe coupling 10 which concerns on the above-mentioned embodiment is demonstrated. FIG. 5 is a diagram corresponding to FIG. 1, and the same reference numerals are given to the same portions as FIG. 1. The joint main body 30 of this form has a spiral hole 90 on the surface of the first pipe portion 31.

  The joint body 30 can be fitted with a component 91 such as a pressure valve, a drain valve and a socket having a corresponding spiral portion as shown by a one-dot chain line in FIG.

  In addition, the same spiral hole 90 may be formed in the joint main body 30 having the branch pipe 80 described in the above-described modification (3).

Sectional drawing of the loose flange type pipe joint which concerns on one Embodiment of this invention. The disassembled perspective view of the said loose flange type pipe joint. The perspective view of the other 2nd fixing flange part which can be utilized in the said loose flange type pipe joint. The figure equivalent to FIG. 1 of the loose flange type pipe joint which concerns on another form. Furthermore, the figure equivalent to FIG. 1 of the loose flange type pipe joint which concerns on another form. Sectional drawing of the conventional loose flange type pipe joint.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Loose flange type pipe joint 20 Loose flange part 21 Through-hole 22 First bolt hole 30 Joint main body 31 First pipe part 32 First fixed flange part 33 First spiral part 40,400 Second fixed flange part 42 Second pipe part 410 Through-hole 43,430 Second bolt hole 44,440 Second spiral part 80 Branch pipe 90 Spiral hole

Claims (9)

A disc-shaped loose flange having a circular through hole provided in the center and a plurality of first bolt holes arranged at intervals on a circumference coaxial with the through hole and opening in the thickness direction And
A joint main body having a first fixed flange portion having a diameter larger than that of the through hole at one end, and having a first spiral portion at the other end, and a cylinder having a smaller diameter than the through hole;
A second spiral portion corresponding to the first spiral portion is provided in the center portion, and a plurality of second bolt holes that are arranged at intervals on a circumference coaxial with the joint body and open in the thickness direction are provided. A disc-shaped second fixing flange portion,
The joint body is inserted into the through-hole of the loose flange portion, and the second fixing flange portion is fixed to the joint body by screwing the first spiral portion and the second spiral portion. Being
Loose flange fitting.   The loose flange-type pipe joint according to claim 1, wherein the second fixed flange portion has a tube portion protruding at a center portion, and the second spiral portion is formed in the tube portion.   The loose flange-type pipe joint according to claim 1 or 2, wherein the first spiral portion is an outer spiral and the second spiral portion is an inner spiral.   The loose flange-type pipe joint according to claim 1 or 2, wherein the first spiral portion is an inner spiral and the second spiral portion is an outer spiral.   5. The joint body according to claim 1, wherein the joint body has a branch pipe that protrudes inward and has an inner surface formed with a spiral, and the branch pipe is formed integrally with the joint body. Loose flange type pipe fitting.   The loose flange type pipe joint according to any one of claims 1 to 5, wherein the joint body has a spiral hole on a surface thereof. A cylindrical tube,
A flange portion integrally formed at one end of the tube portion;
A spiral formed at the other end of the tube;
Loose flange type pipe fitting body with   The loose flange-type pipe joint body according to claim 7, wherein the pipe part integrally has a branch pipe that protrudes inward and has an inner surface formed with a spiral.   The loose flange type pipe joint body according to claim 7 or 8, wherein the pipe portion has a spiral hole on a surface thereof.

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