JP2008275005A - Housing type pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a housing type pipe joint for allowing easy visual check of whether a pipe end anti-corrosive core is in a mounted condition or not. <P>SOLUTION: In the housing type pipe joint, a pair of housings 20, 20 are applied via a packing 23 onto the outer peripheries of pipe ends 24a, 25a of pipes 24, 25 to be joined to each other, between circumferential grooves 26, 27, and mutually opposed flanges 20d, 20d of the housings 20, 20 are fastened to each other with a bolt 21 and a nut 22. The pipe end anti-corrosive core 28 is mounted at both pipe ends 24a, 25a of the pipes 24, 25, and view windows 34 are provided in side walls 20b, 20c of the housings 20, 20 to view an outside cylinder portion 28c of the pipe end anti-corrosive core 28. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is applied to various pipes such as water supply, fire extinguishing, cooling water, cold / hot water, drainage, etc., and pipe end anticorrosion cores are attached to both pipe ends subjected to grooving of two pipes joined to each other. The present invention relates to a housing type pipe joint in which packing is fitted to both pipe ends on which pipe end anticorrosion cores are mounted, a housing is covered from above, and a fluid is sealed by tightening with bolts and nuts.

As this type of housing-type pipe joint, for example, one shown in FIG. 6 is known (see, for example, Patent Document 1). The housing-type pipe joint 1 has two pipes 2 and 2 in which resin linings 2a are formed on the inner surfaces and circumferential grooves (grooves) 2b are formed on the outer circumferences of the pipe ends. A pair of arc-shaped and cross-sectional groove-shaped housings 1a and 1a are put on the outer periphery between the circumferential grooves 2b and 2b at both pipe ends of the pipes 2 and 2 to be joined to each other through a packing 3, The flange 6 of the housing 1a and the flange 6 of the other housing 1a are tightened with bolts 4 and nuts 5 to seal the fluid in the pipes 2 and 2.
Each housing 1a is formed with a concave groove 8 for accommodating both pipe ends of the two pipes 2 and 2 and the packing 3, and an engagement protruding wall 1b fitted into each circumferential groove 2b of the pipes 2 and 2. Forming.
A rubber pipe end anticorrosion core 7 is attached to each pipe end of the two pipes 2 and 2 in order to prevent corrosion of the pipe end faces 2c and 2c. The tube end anticorrosion core 7 is disposed inside each tube end and extends in the tube axis direction, and extends radially outward from the outer end of the inner tube portion 7a to extend the tube end surface 2c of each tube end. , 2c and a flange portion 7b that extends in the tube axis direction from the flange portion 7b and has an outer cylindrical portion 7c that is disposed between the outside of each tube end and the packing 3, and is formed in a U-shaped cross section. ing.

Utility model registration No. 2577023

In the housing-type pipe joint 1 in which the pipe end anticorrosion core 7 is incorporated, the outer edge portion of the packing 3 is attached to the outer cylindrical portion 7c of the pipe end anticorrosion core 7 as a means for detecting that the pipe end anticorrosion core 7 is not mounted after the pipe construction. The lip portion 3a provided on the pipe is firmly contacted or connected, and when the pipe end anticorrosion core 7 is not attached, the packing 3 does not adhere to the outer circumference of the pipe end by the thickness of the outer cylindrical part 7c. For this reason, when the pipe end anticorrosion core 7 is not installed, the lip 3a of the packing 3 and the outer periphery of the pipe end are not sealed and fluid leakage occurs. That is, it is possible to detect that the pipe end anticorrosion core 7 is not attached.
However, in this case, it is not possible to easily visually check from the outside whether the pipe end anticorrosion core 7 is inserted immediately after the pipe construction, but it is possible to detect the unattachment of the pipe end anticorrosion core 7 only by a water pressure test. And there was the difficulty that the confirmation was not enough.

  The present invention has been made to solve such problems. The object of the present invention is to visually check whether or not the pipe end anticorrosion core is installed in the housing type pipe joint incorporating the pipe end anticorrosion core as described above. It is an object of the present invention to provide a housing-type pipe joint that can be easily confirmed by the above-described method and prevents the pipe end anticorrosion core from being unmounted.

As described in claim 1, the present invention will be described with reference to the reference numerals in FIGS. 1 to 3 for easy understanding of the contents of the invention. Resin linings 24c and 25c are formed on the inner surfaces. The pipe ends 24a, 25a of the two pipes 24, 25 having the circumferential grooves 26, 27 formed on the outer circumferences of the pipe ends 24a, 25a are joined to each other, A pair of arc-shaped and groove-shaped housings 20 and 20 are provided on the outer peripheries of the ends 24a and 25a through the packing 23. The housing 20 has an arc-shaped central abdominal wall 20a and both ends of the central abdominal wall 20a. The pair of side walls 20b, 20c projecting radially inward form the pipe ends 24a, 25a of the two pipes 24, 25 and the concave groove 31 for accommodating the packing 23, and are formed at both ends in the circumferential direction of the central abdominal wall 20a. The flanges 20d and 20d are formed, and the engaging projection wall 32 extending radially inward from the inner peripheral end of the one side wall 20b and fitting into the circumferential groove 26 of the one pipe 24, and the other side wall 20c An engagement projecting wall 33 extending radially inward from the inner peripheral end and fitting into the circumferential groove 27 of the other pipe 25 is formed, and the pipe ends 24a and 25a of the two pipes 24 and 25 are respectively connected to the pipe ends 24a and 25a. An inner cylindrical portion 28a that is disposed inside the tube ends 24a and 25a and extends in the tube axis direction, and extends radially outward from the outer end of the inner cylindrical portion 28a, and the tube end surfaces 24b and 25b of the respective tube ends 24a and 25a. A pipe end anticorrosion core having a flange part 28b covering the pipe and an outer cylinder part 28c extending from the flange part 28b in the pipe axis direction and disposed between the outer sides of the pipe ends 24a and 25a and the inner periphery of the packing 23. 28, and a pair of housings 20 and 20 In the housing-type pipe joint in which the flanges 20d and 20d facing each other are fastened by fastening means including bolts 21 and nuts 22, the side walls 20b and 20c of the housings 20 and 20 have a viewing window 34 formed by holes or notches. The outer cylindrical portion 28c of the pipe end anticorrosion core 28 is characterized by extending until it faces the inside of the viewing window 34.
According to such a configuration, the pipe ends 24 a and 25 a of the pipes 24 and 25 can be anticorrosive by the pipe end anticorrosion core 28. During or after the construction, the outer tube portion 28c of the pipe end anticorrosion core 28 can be seen from the observation window 34, so that the pipe end anticorrosion core 28 can be easily confirmed visually. If it is not attached, the outer cylindrical portion 28c of the pipe end anticorrosion core 28 cannot be seen from the viewing window 34, so that it is possible to easily confirm visually that the pipe end anticorrosion core 28 is forgotten to be attached. Therefore, it is possible to promote the attachment of the pipe end anticorrosion core 28.

  The housing-type pipe joint according to claim 1 can employ a configuration in which the reinforcing ring 29 is inserted into the inner diameter side of the inner cylindrical portion 28a for the pipe end anticorrosion core 28 as described in claim 2. According to this structure, since the inner cylinder part 28a is pressed toward the resin linings 24c and 25c by the reinforcing ring 29, high sealing performance is obtained between the inner cylinder part 28a and the resin linings 24c and 25c. Further, as in the case of the housing-type pipe joint of Patent Document 1 described above, when the rubber elasticity of the rubber tube end anticorrosion core 7 is lowered particularly after long-term use, the inner cylindrical portion 7a is turned up by the flow of fluid. The problem of fear can be solved. Further, there is an advantage that the pipe end anticorrosion core 28 can be mounted while maintaining a high sealing property even with a resin lining having poor adhesion such as polyethylene.

  In the housing-type pipe joint according to claim 1 or 2, as described in claim 3, the pipe end anticorrosion core 28 is individually attached to the pipe ends 24a and 25a of the two pipes 24 and 25, respectively. It consists of the 1st pipe end anti-corrosion core 28A and the 2nd pipe end anti-corrosion core 28B which were formed separately in this way, or the said pipe end anti-corrosion core 28 as described in Claim 4 The first pipe end anticorrosion core 28A and the second pipe end anticorrosion core 28B that are respectively attached to the pipe ends 24a and 25a of the two pipes 24 and 25 are integrally formed. Can do.

  According to the present invention, since the presence or absence of the outer cylindrical portion of the tube end anticorrosion core can be easily confirmed from the viewing window, it is possible to prevent the tube end anticorrosion core from being overlooked.

  A preferred embodiment of the present invention will be described with reference to the drawings. 1 is a sectional view of a half-cut portion of a housing-type pipe joint according to an embodiment of the present invention, FIG. 2 is a side view of the half-cut-off side of the housing-type pipe joint, and FIG. FIG. 4 is a cross-sectional view showing another modification of the viewing window of the housing-type pipe joint, and FIG. 5 is a cross-sectional view showing a housing-type pipe joint of another embodiment corresponding to FIG. .

  1 and 2, a housing-type pipe joint 19 joins pipe ends 24 a and 25 a of two pipes 24 and 25 to face each other, and is a pair of arcuate housings made of metal such as cast iron. 20, 20, fastening means including a bolt 21 and a nut 22 that fasten the ends of the housings 20, 20, and a packing 23 accommodated in the housing 20. The packing 23 is a self-sealing type formed in a ring shape having a lip groove shape in cross section, and is made of synthetic rubber or the like.

The pipes 24 and 25 are formed with resin linings 24c and 25c for the purpose of improving corrosion resistance and the like on the inner surface of a steel pipe or the like, and circumferential grooves 26 and 27 are provided on the pipe ends 24a and 25a of the pipes 24 and 25, respectively. It is formed by roll rolling or the like at a predetermined distance from 24b and 25b.
The pipe end anticorrosion core 28 is fitted and attached to the pipe ends 24 a and 25 a of the two pipes 24 and 25. Each tube end anticorrosion core 28 is disposed inside each tube end 24a, 25a and extends in the tube axis direction, and extends radially outward from the outer end of this inner tube portion 28a to each tube end 24a. , 25a covering the tube end surfaces 24b, 25b, and an outer tube portion extending from the flange portion 28b in the tube axis direction and disposed between the outer sides of the tube ends 24a, 25a and the inner periphery of the packing 23. And a U-shaped cross section having 28 c. Each outer cylindrical portion 28c extends from the tube end surfaces 24b, 25b of the tube ends 24a, 25a until reaching the front of the circumferential grooves 26, 27.

  As shown in FIG. 1, the inner and outer cylinder portions 28a and 28c and the flange portion 28b of the tube end anticorrosion core 28 are sealed with synthetic rubber, synthetic resin or the like in order to ensure sufficient sealing performance with the outer surfaces of the tube ends 24a and 25a. It is formed of a packing material, and a reinforcing ring 29 made of a metal such as SUS or a resin having an L-shaped cross section is formed on the outside of the inner cylindrical portion 28a and the flange portion 28b and reinforced by polymerization. Since the inner cylindrical portion 28a is pressed toward the resin linings 24c and 25c by the reinforcing ring 29, high sealing performance is obtained between the inner cylindrical portion 28a and the resin linings 24c and 25c. In addition, it is preferable to form an annular protrusion 30 on the outer periphery of the inner cylindrical portion 28a as shown in FIG. 3 to increase the contact pressure with the inner peripheral surfaces of the tube ends 24a and 25a to ensure close contact.

  The housing 20 includes pipe ends 24a and 25a and packings 23 of two pipes 24 and 25 by an arcuate central abdominal wall 20a and a pair of side walls 20b and 20c projecting radially inward from both ends of the central abdominal wall 20a. A concave groove 31 to be accommodated is formed, and flanges 20d and 20d are formed at both ends in the circumferential direction of the central abdominal wall portion 20a, and the circle of one pipe 24 extends radially inward from the inner peripheral end of one side wall 20b. An engagement projection wall 32 that fits into the circumferential groove 26 and an engagement projection wall 33 that extends radially inward from the inner circumferential end of the other side wall 20 c and fits into the circumferential groove 27 of the other pipe 25. Forming.

  In the housing 20, a viewing window 34 with a hole penetrating inward and outward is provided in at least one position of each side wall 20 b, 20 c, and the outer cylinder portion 28 c of the pipe end anticorrosion core 28 can be seen from the viewing window 34. The portion 28c is extended until it reaches the inside of the viewing window 34.

  Next, a construction procedure for connecting the two pipes 24 and 25 using the housing type pipe joint having the above-described configuration will be described.

  First, the pipe end anticorrosion cores 28 are respectively attached to the pipe ends 24a and 25a of the pipes 24 and 25 that are joined to each other. Next, the packing 23 is fitted on the outer periphery between the circumferential grooves 26 and 27 of the pipe ends 24a and 25a of the pipes 24 and 25 which are joined to each other.

  Next, the housings 20 and 20 are covered from above the packing 23 so that the pipe ends 24a and 25a of the pipes 24 and 25 and the packing 23 are accommodated in the concave grooves 31 and 31, and the engagement protruding wall 32 of one side wall 20b is formed. The engagement protrusion wall 33 of the other side wall 20c is engaged with the circumferential groove 27 of the other tube 25 in the circumferential groove 26 of one tube 24, respectively. At this time, the outer cylinder part 28c of the pipe end anticorrosion core 28 can be visually confirmed from the observation window 34. Therefore, in the case where the installation of the pipe end anticorrosion core 28 is forgotten, the installation of the pipe end anticorrosion core 28 is urged before the housings 20 and 20 are tightened together with bolts 21 and nuts 22 described later.

  Finally, the flanges 20 d and 20 d facing each other of the housings 20 and 20 are tightened with a tightening means including a bolt 21 and a nut 22. The bolt 21 and the nut 22 are tightened to obtain a sealed state in which fluid is prevented from leaking from the pipe ends 24 a and 25 a of the pipes 24 and 25, and one of the engagement protruding walls 32 is a circumferential groove 26 of the one pipe 24. In addition, it is possible to obtain a state in which the other engagement protruding wall 33 engages with the circumferential groove 27 of the other pipe 25 in a retaining manner. Needless to say, it is possible to visually confirm that the pipe end anticorrosion core 28 is not attached from the observation window 34 even after the construction.

In the above-described embodiment, the observation window 34 is formed by a hole that penetrates at least one of the side walls 20b and 20c, but the side walls 20b and 20c and the engagement projection walls 32 and 33 are formed as shown in FIG. The viewing window 34 can also be configured by a notch formed in at least one of each.
Moreover, in the said Example, the pipe | tube end anti-corrosion core 28 was formed in the 1st body so that it might be separately attached to each pipe end 24a, 25a of two piping 24, 25 like FIG. The pipe end anti-corrosion core 28A and the second pipe end anti-corrosion core 28B are replaced by two pipe end anti-corrosion cores 28B, as shown in FIG. 5, in order to reduce the number of members. The first pipe end anticorrosion core 28A and the second pipe end anticorrosion core 28B that are respectively attached to the pipe ends 24a and 25a of the pipes 24 and 25 may be integrally formed.
Further, the pipe end anticorrosion core 28 may be entirely formed of a metal material. In this case, as shown in FIG. 5, a circumferential groove 35 on the outer periphery of the inner cylindrical portion 28a is provided, and a sealing material 36 such as an O-ring is fitted in the circumferential groove 35 to the inner peripheral surfaces of the pipe ends 24a and 25a. It is preferable to be able to hermetically seal.

It is a half notched sectional view of a housing-type pipe joint according to an embodiment of the present invention. FIG. 3 is a side view of the housing-type pipe joint in a half-broken state. It is sectional drawing of the pipe end anticorrosion core of the housing type pipe joint. It is sectional drawing which shows the other modification of the observation window of the housing type pipe joint. FIG. 6 is a half-broken cross-sectional view showing a housing type pipe joint of another embodiment corresponding to FIG. 1. It is a half notched cross-sectional view of a housing type pipe joint of a conventional example.

Explanation of symbols

20 Housing 20a Central abdominal wall 20b, 20c Side wall 20d Flange 21 Bolt 22 Nut 23 Packing 24, 25 Piping 24a, 25a Pipe end 24b, 25b Pipe end face 24c, 25c Resin lining 26, 27 Circumferential groove 28 Pipe end anticorrosion core 28a Inner cylinder Portion 28b flange portion 28c outer tube portion 28A first tube end anticorrosion core 28B second tube end anticorrosion core 29 reinforcing ring 31 concave groove 32, 33 engagement protrusion wall 34 viewing window

Claims (4)

Resin lining is formed on each inner surface, and the pipe ends of two pipes each having a circumferential groove formed on the outer periphery of each pipe end are joined to each other in a mutually opposing manner, , Including a pair of arcuate and grooved housings that are placed over the packing,
The housing has an arcuate central abdominal wall and a pair of side walls projecting radially inward from both ends of the central abdominal wall to form a recessed groove for accommodating the pipe ends of the two pipes and the packing, and the central abdominal wall The flanges are formed at both ends in the circumferential direction of the part, and the engaging protrusion wall that extends radially inward from the inner peripheral end of one side wall and fits into the circumferential groove of one pipe, and the inner side of the other side wall An engagement projection wall extending radially inward from the end and fitting into a circumferential groove of the other pipe;
An inner tube portion disposed inside each tube end and extending in the tube axis direction at both tube ends of the two pipes, and a tube end surface of each tube end extending radially outward from the outer end of the inner tube portion A pipe end anticorrosion core having a flange part covering the pipe and an outer cylinder part extending between the outer side of each pipe end and the inner periphery of the packing extending in the pipe axis direction from the flange part,
In the housing-type pipe joint in which the flanges facing each other of the pair of housings are fastened with fastening means comprising bolts and nuts,
A housing-type pipe joint, characterized in that a viewing window is provided on both side walls of the housing, and an outer cylindrical portion of the pipe end anticorrosion core extends until it faces the inside of the viewing window.   The housing-type pipe joint according to claim 1, wherein the pipe end anticorrosion core has a reinforcing ring fitted on an inner diameter side of the inner cylindrical portion.   The pipe end anticorrosion core includes a first pipe end anticorrosion core and a second pipe end anticorrosion core that are separately formed so as to be individually attached to the pipe ends of the two pipes, respectively. Item 3. The housing-type pipe joint according to Item 1 or 2.   The pipe end anticorrosion core is formed by integrally forming a first pipe end anticorrosion core and a second pipe end anticorrosion core that are respectively attached to the pipe ends of the two pipes. Housing type pipe fitting.

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