JPH07224980A - Pipe end corrosion protective mechanical joint - Google Patents

Abstract

PURPOSE:To connect a small bore pipe body of 1/2-2B in nominal bore by a pipe end corrosion protective mechanical joint and make this pipe end corrosion protective mechanical joint usable being assembled in a piping system construction site and also as a bell-and-spigot joint. CONSTITUTION:The parallel thread 13 of a joint body and the parallel thread 47 of a pressor ring 40 are screwed with each other and clamped. A slip-off stopper ring 50, a retainer 60 and a first packing 70 can be held being accommodated in the pressor ring 40. When the joint body is connected to a pipe body 100A, the end face 101A of the pipe body 100A is positioned in a closed space surrounded by sealant 29, the first packing 70 and a pipe end core 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe end anticorrosion mechanical joint mainly used for a water supply or hot water supply piping system.

[0002]

2. Description of the Related Art In the above-mentioned piping system which is now popular, the inner surface of a metal pipe such as a steel pipe is used as a pipe body in order to prevent deterioration of water quality due to rusting on the inner peripheral surface of the pipe body used for piping. PVC lining layer (vinyl chloride resin lining layer)
An inner surface coated tube coated with a synthetic resin layer such as is used. Further, in order to connect such inner surface coated pipes, a mechanical joint having a pipe end anticorrosion function, that is, a pipe end anticorrosion mechanical joint is used in order to prevent the pipe ends from being corroded at the joints. And the nominal diameter 80A (A is m
The conventional pipe end anti-corrosion mechanical joint used when connecting pipes with a relatively large diameter, such as m) is a bolt and nut with flanges attached to the respective ends of two pipes. It was a flange connection type that was tightened with and connected.

[0003]

However, many bolts and nuts are required as tightening parts in order to connect the inner surface coated pipes with each other by the flange joint type pipe end anticorrosion mechanical joint as in the prior art, and the flange is also required. The joint type pipe end anticorrosion mechanical joint is not suitable for joining pipes having a small diameter such as a nominal diameter of 1/2 to 2B (B represents inch). In addition, when connecting pipes with small diameters, not only is it necessary to assemble the pipe end anticorrosion mechanical joint itself at the piping system construction site, but also preassemble the pipe end anticorrosion mechanical joint before the pipe system construction. In the field, there is also a demand to use the pipe end anticorrosion mechanical joint as a plug joint having a function of connecting the pipe bodies only by inserting the ends of the pipe bodies.

The object of the present invention is that it can be suitably adopted for joining small-diameter pipes having a nominal diameter of about 1/2 to 2B, and when joining such small-diameter pipes. In addition, it is an object of the present invention to provide a pipe end anticorrosion mechanical joint that can be assembled and used at a piping system construction site and can also be used as an insertion joint. Another object of the present invention is to provide a pipe end anticorrosion mechanical joint that can be suitably used in a piping system for water supply or hot water supply.

[0005]

According to a first aspect of the present invention, there is provided a pipe end anticorrosion mechanical joint having a joint body having parallel threads and a first seating surface provided on an end face thereof, and an inner fitting at an end portion of the pipe body. A cylindrical main body that can be fitted and a packing seating surface that is provided on this main body at a predetermined position on the surface of the main body that is larger in diameter than the outer peripheral diameter and that is located in the protruding direction of the main body. A pipe end core having a flange portion provided with a second seat surface facing the first seat surface at a predetermined position on the opposite side surface of the pipe, and a pipe held by the pipe end core at a predetermined position on the outer periphery of the main body of the pipe end core. A sealing material having elasticity to close the gap between the body and the main body part fitted in the end portion of the pipe body, and a cylindrical core surrounding surface having a diameter larger than the flange portion of the pipe end core, A packing pressing surface having a smaller diameter than the core surrounding surface and a tapered tapered surface are formed side by side in this order in the axial direction. A stepped first pressing portion that is axially engageable is formed on the outer peripheral portion of the flange portion of the tube end core between the packing pressing surface and the tapered pressing surface. A push ring having a stepped second pressing portion, a cylindrical portion having parallel threads that can be screwed into the parallel threads of the joint body, and external fitting to the end of the pipe body. And a first packing that can be held in a space surrounded by the packing pressing surface of the push wheel and has elasticity that is compressed by the packing pressing surface of the push wheel that is externally fitted to the end of the tubular body and the tubular body. Can be held in the space surrounded by the tapered tapered surface of the push ring, and is interposed between the tapered tapered surface of the push ring externally fitted to the end of the tubular body and the tubular body, and is tapered. A retaining ring having a diameter that is larger than the smallest diameter portion of the surface and capable of reducing its diameter, and a first packing and a retaining ring. A ring-shaped retainer engageable in the axial direction are interposed in the above second pressing portion outer peripheral portion between, the first seat surface and the pipe end core of the joint body 2
A second packing interposed between the retainer and the seating surface, and the retainer when the second pressing portion axially pushes the retainer as the parallel screw of the push ring is tightened to the parallel screw of the joint body. When the first packing pressed against the packing seating surface of the flange portion of the tube end core is compressed by a predetermined amount in the axial direction, the first pressing portion of the push ring starts to push the flange portion of the tube end core in the axial direction. The total axial length of the retainer and the first packing is defined in. The pipe end anticorrosion mechanical joint according to the invention of claim 2 comprises a joint main body having parallel threads and having a first seat surface on the end surface, and a tubular main body portion capable of being internally fitted to the end portion of the pipe body. A second seating surface facing the first seating surface is provided at a predetermined location on a surface of the main body that is larger in diameter than the outer peripheral diameter of the tubular body and is located on the side opposite to the protruding direction of the main body. And a pipe end core having a flanged portion, and a gap between the pipe body and the main body portion internally fitted to the end portion of the pipe body held at a predetermined position on the outer periphery of the main body portion of the pipe end core. A sealing material that has elasticity to close, a cylindrical core surrounding surface with a diameter larger than the flange of the pipe end core, a packing pressing surface with a diameter smaller than the core surrounding surface, and a tapered tapered surface in this order. And a stepped pressing member that is axially engageable with the outer peripheral portion of the flange portion of the pipe end core between the core surrounding surface and the packing pressing surface. And a pressing ring that has a cylindrical portion having parallel threads that can be screwed onto the parallel threads of the joint body and that can be externally fitted to the end of the tubular body, and a packing pressing surface of the pressing wheel. A first packing, which can be held in the enclosed space, is elastically compressed by the packing pressing surface of the pressing wheel and the tube that are externally fitted to the end of the tube, and the tapered tapered surface of the pressing wheel. It can be held in the space surrounded by, and is interposed between the tapered tapered surface of the push ring externally fitted to the end of the tubular body and the tubular body, and is smaller than the smallest diameter portion of the tapered tapered surface. A diameter-reducible retaining ring having a large outer diameter, a ring-shaped retainer interposed between the first packing and the retaining ring, a first seating surface of the joint body and a second end of the pipe end core. The second packing interposed between the seat surface and the outer surface of the flange portion of the pipe end core is kept at a predetermined position. It is has been 挾圧 by the flange portion and the junk ring core surrounding surface of the pipe end core accommodated in the pressing ring in which comprises a third packing for closing the gap between these flange portions and the core surrounding surface. A pipe end anticorrosion mechanical joint according to the invention of claim 3 includes a joint main body having parallel threads and having a first seat surface on an end surface thereof, and a tubular main body portion capable of being internally fitted to an end portion of the pipe body. A second seating surface facing the first seating surface is provided at a predetermined location on a surface of the main body that is larger in diameter than the outer peripheral diameter of the tubular body and is located on the side opposite to the protruding direction of the main body. And a pipe end core having a flanged portion, and a gap between the pipe body and the main body portion internally fitted to the end portion of the pipe body held at a predetermined position on the outer periphery of the main body portion of the pipe end core. An elastic sealing material, a cylindrical core surrounding surface with a diameter larger than the flange of the tube end core, a packing pressing surface, and a tapered tapered surface are formed in this order in the axial direction. The packing pressing surface and the packing pressing surface are partitioned by a first inner collar portion having a smaller diameter than these surfaces, and the packing pressing surface and the tapered taper The packing surface is partitioned by a second inner flange portion having a diameter smaller than that of the packing pressing surface, and the first inner flange portion has a packing pressing surface side as a packing contact surface, and a surface opposite to the packing contact surface is the above-mentioned. A parallel thread that is an engagement surface for the flange portion of the pipe end core, the second inner flange portion has a packing pressing surface side as a packing contact surface, and that can be screwed onto the parallel thread of the joint body. And a tubular body having a tubular portion having a cylindrical shape and capable of being externally fitted to the end portion of the tubular body, and can be held in a space surrounded by the packing pressing surface of the tubular body and the first and second inner flange portions, A space surrounded by a first packing having elasticity that is compressed by the packing pressing surface of the push wheel and the tubular body that are externally fitted to the end, the tapered taper surface of the push wheel, and the second inner flange portion. Between the tapered tapered surface of the push ring that is externally fitted to the end of the pipe and the pipe. Between the first seating surface of the joint body and the second seating surface of the tube end core, which are interposed and which can be reduced in diameter and have an outer peripheral diameter larger than the smallest diameter portion of the tapered tapered surface. And a second packing interposed therebetween. A pipe end anticorrosion mechanical joint according to a fourth aspect of the present invention is the pipe joint according to any one of the first, second and third aspects, wherein the inner surface of the metal tube is covered with a synthetic resin layer as the tube body. It uses a cladding tube. A pipe end anticorrosive mechanical joint according to a fifth aspect of the present invention is the pipe joint according to the fourth aspect, wherein the joint body is formed by coating the inner surface of a metal tubular body with a synthetic resin layer.

[0006]

In the pipe end anticorrosion mechanical joint according to each of the first, second, third, fourth and fifth aspects of the present invention, the parallel threads of the push ring are screwed onto the parallel threads of the joint body and tightened. In addition, since the tightening of the push ring and the joint body can be tightened using a tool such as a wrench, it is suitable for connecting pipes with a small diameter of about 1/2 to 2B. Can be adopted.

The pipe end anticorrosion mechanical joint according to the first aspect of the present invention can be assembled and used at a piping system construction site or can be used as a plug joint. When assembled and used at the piping system construction site,
After the push ring, retaining ring, retainer, and first packing are sequentially fitted to the pipe body, the main body of the pipe end core having the sealing material held in the main body is fitted to the end of the pipe body. The flange portion of the lever end core is opposed to the end face of the pipe body, and then the second packing is interposed between the second seating face of the pipe end core and the first seating face of the joint body so that the push ring is parallel. Align the screws with the parallel threads on the fitting body. With this configuration, the retaining ring is interposed between the tapered tapered surface of the push ring and the tubular body, the retainer is associated with the second pressing portion, and the first packing is sandwiched between the packing pressing surface and the tubular body. The flange portion of the tube end core corresponds to the first pressing portion. Therefore, when the push ring and the joint body are tightened via the parallel screw, the retainer pressed by the second pressing portion presses the first packing against the packing seat surface of the pipe end core, so that the first packing is not connected to the packing seat surface. The packing pressing surface of the pressing wheel and the outer peripheral surface of the tubular body are in close contact with each other in a compressed state. Then, when the first packing is pushed by the retainer and compressed to some extent in the axial direction, the first pressing portion comes into contact with the flange portion and pulls the joint body toward the flange portion. As a result, the second packing is pressed by the second seating surface of the collar portion and the first seating surface of the joint body, and the second packing closely contacts the first and second seating surfaces. Further, the sealing material held by the main body of the pipe end core closes the gap between the pipe body and the main body portion internally fitted to the end of the pipe body. When it is used as a plug-in joint, the retaining ring, the retainer and the first packing are fitted to the push ring in this order, and the pipe end core holding the sealing material is fitted into the annular groove of the main body, and then, A second packing is interposed between the second seat surface of the pipe end core and the first seat surface of the joint body, and the parallel screw of the push ring is screwed onto the parallel screw of the joint body. In this way, the retaining ring is held in the space surrounded by the tapered tapered surface of the push ring, the retainer and the first packing are held in the space surrounded by the packing pressing surface, and the flange portion of the tube end core is pressed by the push ring. It is housed in the space surrounded by the core surrounding surface. Therefore, the tubular body can be inserted into the push ring and the end portion of the tubular body can be externally fitted to the main body portion of the tubular end core through the retaining ring, the retainer and the first packing. Therefore, when the push ring and the joint body are tightened from this state via the parallel screws, as in the above-mentioned place,
Due to the action of the second pressing portion and the retainer, the first packing is brought into close contact with the packing seating surface, the packing pressing surface of the pressing wheel and the outer peripheral surface of the pipe body in a compressed state, and the second seating surface of the flange portion of the pipe end core and the joint body. The second packing comes into close contact with the first seat surface of the. In addition, the sealing material held by the main body of the tube end core closes the gap between the tubular body and the main body that is internally fitted to the end of the tubular body. As described above, the internal passage of the pipe body and the outside of the pipe body are water-tightly blocked at two points by the seal material and the first packing when assembled at the construction site of the piping system or used as a plug joint. In addition, the abutment point between the pipe end core and the joint body is kept watertight by the second packing.
Moreover, since the end face of the pipe body is disposed in the closed space surrounded by the seal material, the first packing, and the pipe end core, the end face of the pipe body comes into contact with water flowing through the internal passage of the pipe body and rusts. That cannot happen.

In the pipe end anticorrosion mechanical joint according to the invention described in claim 2, the second pressing portion in the invention described in claim 1 is omitted. Therefore, the adhesiveness at the contact point between the first packing and the flange portion of the pipe end core is lower than that of the invention according to claim 1, regardless of whether it is used after being assembled at the site of construction of the piping system or as a plug joint. However, in the invention described in claim 2, since the gap between the flange portion of the pipe end core and the core surrounding surface of the push ring is closed by the third packing, even when assembled at a piping system construction site and used as a plug joint. However, the inner passage of the pipe body and the outside of the pipe body are water-tightly blocked at three points by the seal material, the first packing and the third packing, and the butting point between the pipe end core and the joint body is the second point. It will be kept watertight by the packing. Moreover, since the end face of the pipe body is disposed in the sealed space surrounded by the seal material, the first packing, the third packing and the pipe end core, the end face of the pipe body comes into contact with the water flowing through the internal passage of the pipe body. It cannot happen that it rusts. In the invention described in claim 2, the procedure of assembling at the construction site of the piping system and the procedure of using as a plug-in joint are substantially the same as the case of the invention described in claim 1. That is, in the invention described in claim 2, when assembling at the piping system construction site,
It is different from the case of the invention according to claim 1 only in that the main body of the tube end core holding the third packing at a predetermined position on the outer peripheral portion of the flange portion is fitted into the end of the tube body. When using it as a plug-in joint, make sure that the third
The only difference is that the tube end core holding the packing is fitted into the push ring, unlike the case of the invention described in claim 1. The other actions are the same as the actions of the invention described in claim 1.

The pipe end anticorrosion mechanical joint according to the invention described in claim 3 can also be assembled and used at a piping system construction site or used as a plug joint. When assembled and used at a piping system construction site, the retaining ring is surrounded by the tapered taper surface and the second inner flange portion, and the retaining ring is surrounded by the packing pressing surface and the first and second inner flange portions. After the push ring holding the first packing in the space is externally fitted to the pipe body, the main body portion of the pipe end core having the seal member held in the main body portion is internally fitted to the end portion of the pipe body. The flange portion of the lever end core is opposed to the end face of the pipe body, and then the second packing is interposed between the second seating face of the pipe end core and the first seating face of the joint body so that the push ring is parallel. Align the screws with the parallel threads on the fitting body. In this case, the engaging surface of the first inner flange portion presses the flange portion of the tube end core, so that the second packing is pressed by the second seat surface of the flange portion of the tube end core and the first seat surface of the joint body. As a result, the second packing comes into close contact with the first and second bearing surfaces. Further, the first packing closely contacts the packing pressing surface of the pressing wheel and the outer peripheral surface of the tubular body. Further, the sealing material held by the main body of the pipe end core closes the gap between the pipe body and the main body portion internally fitted to the end of the pipe body. When used as a plug-in joint, a retaining ring is provided in the space surrounded by the tapered taper surface of the push ring and the second inner flange portion, and a space surrounded by the packing pressing surface and the first and second inner flange portions. After fitting the tube end core having the seal member held in the main body into the push ring holding the first packing, between the second seat surface of the tube end core and the first seat surface of the joint body. Then, the parallel screw of the push ring is screwed onto the parallel screw of the joint body with the second packing interposed. By doing so, the pipe body can be inserted into the push ring and the end portion of the pipe body can be externally fitted to the main body of the pipe end core through the retaining ring, the second inner flange portion, the first packing and the first inner flange portion. it can. Therefore, when the push ring and the joint body are tightened from this state via the parallel screw, the engagement surface of the first inner collar portion comes into contact with the collar portion and pulls the joint body toward the collar portion side. This makes the second part of the collar part
The second packing is pressed by the seating surface and the first seating surface of the joint body, and the second packing comes into close contact with each of the first and second seating surfaces. During and after the tightening, the first packing remains in close contact with the packing pressing surface of the push ring and the outer peripheral surface of the pipe body, and the sealing material held by the main body of the pipe end core is fixed to the pipe body and the pipe body. The gap between the main body part and the main body part that is fitted in the end of the main body remains closed. As described above, the internal passage of the pipe and the outside of the pipe are water-tight at two points by the seal material and the first packing when assembled at the construction site of the piping system or used as a plug joint. In addition, the butting point between the pipe end core and the joint body is the second
It is kept watertight by the packing, and it is impossible for the end face of the pipe body to come into contact with the water flowing through the internal passage of the pipe body and to rust.

According to the pipe end anticorrosion mechanical joint according to the invention described in claim 4, in addition to the above-mentioned actions, the synthetic resin layer coating the inner surface of the metal tube prevents rusting of the inner surface of the metal tube. Useful for that.

According to the pipe end anticorrosive mechanical joint of the present invention, the synthetic resin layer coating the inner surface of the metal tubular body is made of the metal tubular body in addition to the above-mentioned actions. Helps prevent rusting on the inner surface.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a side view showing a partially cross-sectional view of a pipe end anticorrosion mechanical joint A according to an embodiment of the invention of claims 1, 4 and 5, and FIG. FIG. 3 is a side view in which a part is disassembled and a part is shown in a cross section, and FIG. 3 is an enlarged cross-sectional view of a main part in FIG. 1.

In the pipes 100A and 100B shown in FIG. 1, steel pipes 110A and 110B, which are examples of metal pipes, have a synthetic resin layer 120A such as polyvinyl chloride or polyethylene on the inner surface.
It is a small-diameter inner surface coated tube (inner surface coated steel tube) coated with 120B, and the nominal diameter is in the range of 1/2 to 2B. In this tubular body 100A, 100B, the steel pipe 110A, 11
0B inner surface rusting is prevented by the synthetic resin layers 120A and 120B.

Joint body 10 of pipe end anticorrosion mechanical joint A
Is a metal tubular body 11 made of a steel pipe with an inner surface coated with a synthetic resin layer 12 such as an epoxy resin. Even if the joint body 10 is bent at a right angle as shown in FIG.
Although not shown, it may be straight. The joint body 10 is provided with parallel threads 13, 13 on the outer circumferences of one end and the other end which are made thick and large in diameter, and the end faces of the one end and the other end are entirely the first end. The seat surfaces 14, 14 are formed on the one end and the other end of the pipes 100A, 1
A coupling function for 00B is added. In this joint body 10, rusting of the inner surface of the metal tubular body 11 is prevented by the synthetic resin layer 12.

Since the one end and the other end of the joint body 10 have the same structure, the following description will mainly focus on the structure on the one end side having a coupling function with the tubular body 100A, and the other end. Regarding the parts side, the same signs as those used on the one end side are given, and detailed description will be omitted.

Pipe end core 20 of pipe end anticorrosion mechanical joint A
Is a synthetic resin molded body made of, for example, polyvinyl chloride resin, and has a cylindrical main body portion 21 and a collar portion 2 provided at an end portion of the main body portion 21 and having a diameter larger than the outer peripheral diameter of the tubular body 100A.
2 and. Two ridges 23 and 24 are integrally formed in a ring shape so as to be lined up at predetermined positions on the outer periphery of the main body 21, and a ring-shaped groove 25 is provided between the ridges 23 and 24. As can be seen in FIG. 2, the protrusion 23 on one side on the tip side of the main body 21 is the protrusion 24 on the other side.
It is taller by H than that, and its cross-sectional shape is a lip shape that becomes thinner toward the outer peripheral portion. The collar portion 22 has a cylindrical portion 2 protruding in the protruding direction (arrow X) of the main body portion 21.
6 is provided, and the end surface of the tubular portion 26, that is, the surface of the collar portion 22 located in the projecting direction X of the main body portion 21 is the packing seat surface 27, while the packing seat surface 27 of the packing seat surface 27 is provided. The entire opposite side surface serves as the second seat surface 28. The sealing material 29 is held in the groove 25. As the sealing material 29, an elastic material such as an O-ring is used.

The push ring 40 of the pipe end anticorrosion mechanical joint A is made of metal, and the push ring 40 has a collar portion 2 of the pipe end core 20.
2. A cylindrical core surrounding surface 41 having a diameter larger than 2 and a core surrounding surface 4
A packing pressing surface 42 having a diameter smaller than 1 and a tapered tapered surface 43 are formed side by side in this order in the axial direction. A stepped first pressing portion 44 is formed between the core surrounding surface 41 and the packing pressing surface 42, and a stepped second pressing portion is formed between the packing pressing surface 42 and the tapered tapered surface 43. Part 45
Are formed. Further, the push ring 40 is provided with a tubular portion 46, and the tubular portion 46 is provided with a parallel screw 47 capable of being screwed onto the parallel screw 13 of the joint body 10. In this embodiment, the parallel screw 13 of the joint body 10 is a male screw, and the parallel screw 47 of the push ring 40 is used.
Has a female thread. The push ring 40 can be externally fitted to the end of the tubular body 100A.

The space surrounded by the tapered taper surface 43 of the push ring 40 can hold a steel retaining ring 50. The retaining ring 50 is expandable / contractible by removing one portion in the circumferential direction, and one edge portion is provided at the smallest diameter portion and at a location approximately 60 degrees circumferentially apart from the smallest diameter portion. 51,5
Have two. The outer diameter of the retaining ring 50 in the unloaded state is larger than the diameter of the smallest diameter portion of the tapered tapered surface 43 of the push ring 40, and the diameter of the smallest diameter portion is the same as that of the tubular body 100A. When the retaining ring 50 is slightly smaller or slightly larger than the outer diameter and is slightly smaller than the outer diameter, the retaining ring 50 is pushed and expanded against the springiness of its own. The body 100A can be inserted into the retaining ring 50. The space surrounded by the packing pressing surface 42 of the pressing wheel 40 can hold the retainer 60 and the first packing 70 side by side. The retainer 60 is made of steel and has a ring shape, and the outer peripheral diameter thereof is slightly larger than the diameter of the second pressing portion 45. The outer diameter of the first packing 70 in the unloaded state is larger than the diameter of the packing pressing surface 42, and the inner diameter is smaller than the outer diameter of the tubular bodies 100A and 100B. A tubular rubber ring having a high elasticity is used for the first packing 70, and the total axial length when the retainer 60 and the unloaded first packing 70 are concentrically overlapped with each other is as described above. It is set to be slightly longer than the axial length of the packing pressing surface 42.

Reference numeral 80 is a second packing, and a rubber packing is used for the second packing 80.

The pipe end anticorrosion mechanical joint A having the above construction is
When assembled and used at a piping system construction site, the push ring 40, the retaining ring 50, and the retainer 6 are attached to the pipe body 100A.
The 0 and the first packing 70 are externally fitted in order. Further, the main body portion 21 of the tube end core 20 in which the sealing material 29 is held in a fitted state in the main body portion 21 is fitted into the end portion of the pipe body 100A so that the collar portion 22 of the pipe end core 20 is piped. End face 1 of body 100A
01A, the second packing 80 is interposed between the second seat surface 28 of the tube end core 20 and the first seat surface 14 of the joint body 10, and the parallel screw 47 of the push ring 40 is screwed into the parallel screw 47 of the joint body 10. Screw to 13. As a result, as shown in FIG. 3, the retaining ring 50 is interposed between the tapered tapered surface 43 of the push ring 40 and the tubular body 100A, the retainer 60 is associated with the second pressing portion 45, and the packing pressing surface is provided. 42 and tube 1
00A, the first packing 70 is sandwiched between the first pressing portion 44 and the tubular portion 26 of the collar portion 22 of the tube end core 20.
Is supported. Therefore, when the parallel screw 47 of the push ring 40 is screwed into the parallel screw 13 of the joint body 10 using a predetermined tool such as a wrench, the second pressing portion 45 pushes the retainer 60 in the axial direction, so that the retainer 60 is The first packing 70 is pressed against the packing seating surface 27 of the tube end core 20, and the first packing 7 works in cooperation with the packing seating surface 27.
Clamp 0 in the axial direction. Moreover, since the first packing 70 is also pressed in the radial direction by the packing pressing surface 42 and the tubular body 100A, the first packing 70 is not attached to the packing seat surface 2
7, the packing pressing surface 42, and the outer peripheral surface of the tubular body 100A are brought into close contact with each other in a compressed state, and water tightness is maintained at these three close contact points.

As described above, the total axial length when the retainer 60 and the unloaded first packing 70 are concentrically overlapped with each other is set to be slightly longer than the axial length of the packing pressing surface 42. Since it is determined, when the first packing 70 comes into contact with the packing seat surface 27 in the initial stage of screwing the parallel screw 47 of the push ring 40 into the parallel screw 13 of the joint body 10, the first pressing portion 44 is moved to the position shown in FIG. As indicated by the phantom line, the outer peripheral portion of the collar portion 22 of the tube end core 20 is opposed to the outer peripheral portion with a space. Then, when the first packing 70 is pushed by the retainer 60 and is compressed to some extent in the axial direction, the first pressing portion 44 contacts the flange portion 22 and pulls the joint body 10 toward the flange portion 44 side. Therefore, the collar portion 44
The second packing 80 is pinched by the second seating surface 28 of the joint body 10 and the first seating surface 14 of the joint body 10, and the second packing 80 adheres closely to the first and second seating surfaces 14, 28. Keep watertight at the place. Further, the gap between the main body portion 21 of the tube end core 20 and the tube body 100A is surely closed by the sealing material 29 and the lip-shaped raised portion 23 being in close contact with each other in a compressed state. High watertightness is maintained.

When used as a plug-in joint, the push ring 40
The retaining ring 50, the retainer 60 and the first packing 20 are fitted in this order, and the annular groove 25 of the main body portion 21 is inserted.
The pipe end core 20 holding the sealing material 29 in a fitting state is fitted into the pipe, and the second packing 80 is interposed between the second seat surface 28 of the pipe end core 20 and the first seat surface 14 of the joint body 10. The parallel screw 47 of the push ring 40 is screwed onto the parallel screw 13 of the joint body 10. With this, the retaining ring 50,
Since the retainer 60, the first packing 70, and the pipe end core 20 are held in the push ring 40 in a housed state, it is possible to carry the pipe end anticorrosion mechanical joint A into the piping system construction site in an assembled state.

At the piping system construction site, the tubular body 100A is inserted into the push ring 40 and the end portion of the tubular body 100A is fitted outside the main body portion 21 of the tubular end core 20 through the retaining ring 50, the retainer 60 and the first packing 70. From this state, the parallel screw 47 of the push ring 40 can be
Tighten it by screwing it into the 0 parallel screw 13. By doing so, the pipe end anticorrosion mechanical joint A is used as a plug-in joint, and in the coupled state with the pipe body 100A, the first packing 70, the packing seating surface 27, the packing pressing surface 42, and the pipe are similar to those described above. It adheres to the outer peripheral surface of the body 100A and maintains watertightness at this location, and the second packing 8 is attached to the second seat surface 28 of the tube end core 20 and the first seat surface 14 of the joint body 10.
0 adheres to maintain watertightness at this point. Further, the sealing material 29 closes the gap between the tubular body 100A and the main body portion 21 to keep the watertightness at this portion.

In this way, the internal passage of the tubular body 100A and the outside of the tubular body 100A are watertight by the sealing material 29 and the first packing 70 both when assembled at the construction site of the piping system and when used as a plug-in joint. Be kept in a state,
In addition, the abutment point between the tube end core 20 and the joint body 10 is kept watertight by the second packing 80. Since the end surface 101A of the tubular body 100A is disposed in the sealed space surrounded by the seal material 29, the first packing 70 and the tubular end core 20, the end surface 101A of the tubular body 100A flows through the internal passage of the tubular body 100A. The fact that it rusts by contact with water cannot itself occur.

In the above embodiment, the parallel screw 4 of the push ring 40 is
Although 7 is a female screw and the parallel screw 13 of the joint body 10 is a male screw, as shown as a modification in FIG.
The parallel screw 47 of the push ring 40 may be a male screw and the parallel screw 13 of the joint body 10 may be a female screw. In the modified example of FIG. 4, other matters are the same as those of the embodiment described in FIGS. 1 to 3, and therefore, the same parts are denoted by the same reference numerals and detailed description thereof will be omitted.

FIG. 5 shows claims 2, 4, and 5.
FIG. 3 is an enlarged cross-sectional view of a main part showing an embodiment of the invention of FIG. In this embodiment, the configuration of the parts other than those shown is the same as that described in FIGS.

As can be seen by comparing FIGS. 5 and 3, the pipe end anticorrosion mechanical joint of this embodiment is different from that described with reference to FIGS. 1 to 3 in that Two
The pressing portion 45 is omitted in FIG. 5, and it is fitted in a predetermined position on the outer peripheral portion of the flange portion 22 of the tube end core 20, specifically, in an annular groove portion 31 formed in the tubular portion 26. A third packing 90 is provided which is held by the collar portion 22 of the tube end core 20 housed in the push ring 40 and the core surrounding surface 41 of the push ring 40 to close the gap therebetween by the third packing 90.
An annular groove 1 whose seat surface 14 is formed on the end surface of the joint body 10.
Second packing 80, which is formed by the bottom surface of
As a result, a rubber O-ring is used.

According to the pipe end anticorrosion mechanical joint of FIG.
The third packing 90 closes the gap between the flange portion 22 of the tube end core 20 and the core surrounding surface 41 of the push ring 40 to maintain the watertightness of this portion, so that the internal passage of the tube body 100A and the tube body 100A are maintained. The outside of the tube is kept watertight by the sealing material 29, the first packing 70, and the third packing 90, and the abutting point between the tube end core 20 and the joint body 10 is the second packing 80.
Kept watertight by. Moreover, since the end surface 101A of the pipe body 100A is disposed in the closed space surrounded by the sealing material 29, the first packing 70, the third packing 90, and the pipe end core 20, the end face of the pipe body has an internal passage of the pipe body. The fact that it rusts when it comes into contact with the flowing water cannot occur.

In the embodiment shown in FIG. 5, the procedure for assembling the piping system at the construction site and the procedure for using it as a plug-in joint are substantially the same as those described with reference to FIGS. The difference from the case described in FIGS. 1 to 3 when assembling at the piping system construction site is that the main body portion 21 of the pipe end core 20 holding the third packing 90 is internally fitted to the end portion of the pipe body. This point is different from the case described in FIGS. 1 to 3 when used as a plug-in joint, and the pipe end core 20 having the third packing 90 held in the annular groove portion 31 of the collar portion 22 is fitted into the push ring 40. It is a point.

In the embodiment of FIG. 5, when the tube body 100A and the joint body 10 coupled to each other are pulled and displaced in the direction of separation, the retaining ring follows the displacement of the tube body 100A as shown in FIG. 50 moves while rolling,
Along with that, the retaining ring 50 is tapered and tapered surface 43.
The diameter is reduced by. For this reason, the edge portions 51 and 52 of the retaining ring 50 bite into the tubular body 100A, and the tubular body 100A.
Stop A.

In the embodiment described with reference to FIG. 5, the third packing 90 can be made smaller than the first packing 70. This is because the dimensional accuracy of the push ring 40 and the tube end core 20 is generally higher than the dimensional accuracy of the tubular body 100A. In other words, the first packing 70 is the tubular body 1.
Since it is necessary to have a function of absorbing the dimensional variation of 00A, it is larger than the third packing 90.

In FIG. 5 and FIG. 6, other configurations and operations are the same as those described with reference to FIGS. 1 to 3, and therefore, the same parts are designated by the same reference numerals and detailed description thereof will be omitted.

FIG. 7 shows claims 3, 4, and 5.
FIG. 3 is an enlarged cross-sectional view of a main part showing an embodiment of the invention of FIG. In this embodiment, the configuration other than that shown in the drawing is the same as that described with reference to FIGS.

In the embodiment shown in FIG. 7, the flange portion 2 of the tube end core 20 is used.
In the surface 27a of the main body portion 21 in the protruding direction X in FIG. 2, the first inner collar portion 4 having a smaller diameter than the respective surfaces 41, 42 partitioning the core surrounding surface 41 of the pressing wheel 40 and the packing pressing surface 42.
8 are opposed to each other, the surface of the first inner flange portion 48 on the packing pressing surface 42 side is a packing contact surface 48a, and the surface on the opposite side of the packing contact surface 48a is an engaging surface 48b for the flange portion 22. That is, the packing pressing surface 42 of the pressing wheel 40 and the tapered taper surface 43 are the packing pressing surface 4
It is partitioned by the second inner collar part 49, which has a smaller diameter than 2.
The second inner flange portion 49 has a packing pressing surface 42 side surface as a packing contact surface 49a, and the first packing 70 and the packing pressing surface 42 of the pressing wheel 40 and the first and second inner flange portions 48, 49. The retaining ring 50 is retained in a space enclosed by the tapered inner tapered surface 43 of the push ring 40 and the second inner flange portion 49. 1 is different from that described with reference to FIGS. 1 to 3, and the retainer 60, the first pressing portion 44, and the second pressing portion 45 described with reference to FIGS. In addition,
Since other configurations are the same as the configurations of the pipe end anticorrosion mechanical joint A described in FIGS. 1 to 3, the same portions are denoted by the same reference numerals and detailed description thereof will be omitted.

In the pipe end anticorrosion mechanical joint of FIG.
When assembled and used at a piping system construction site, the retaining ring 50 is provided in the space surrounded by the tapered taper surface 43 and the second inner flange portion 49, and the packing pressing surface 42 and the first and second inner flange portions. The pressing ring 40 holding the first packing 70 in the space surrounded by 49 and 48 is attached to the tubular body 100A.
Then, the main body portion 21 of the pipe end core 20 having the sealing material 29 held by the main body portion 21 is fitted inside the end portion of the pipe body 100A, and the collar portion 22 of the pipe end core 20 is attached. Tube 100
Facing the end surface 101A of the pipe end core 20
The second packing 80 is interposed between the seat surface 28 and the first seat surface 14 of the joint body 10, and the parallel screw 47 of the push ring 40 is screwed onto the parallel screw 13 of the joint body 10. By doing so, the engaging surface 48b of the first inner flange portion 48 is made to have the flange portion 22 of the tube end core 20.
The second packing 80 is pressed by the second seating surface 28 and the first seating surface 14, so that the second packing 80 is pressed.
Adheres to the bearing surfaces 14 and 28 to maintain the watertightness of this portion. Further, the first packing 70 is in close contact with the packing pressing surface 42 and the outer peripheral surface of the tubular body 100A in a compressed state to maintain the watertightness of this portion. Further, the raised portion 23 and the sealing material 29 close the gap between the tubular body 100A and the main body portion 21 of the tubular end core 20 to keep the watertightness of this portion.

When used as a plug-in joint, the push ring 40 holding the retaining ring 50 and the first packing 70 is retained.
After fitting the tube end core 20 holding the sealing material 29 therein, the second packing 80 is interposed between the second seat surface 28 and the first seat surface 14, and the parallel screw 47 of the push ring 40 is jointed thereto. Body 1
It is screwed into the parallel screw 13 of 0 and is brought into the piping system construction site in this state. At the piping system construction site, the tubular body 100A is inserted into the push ring 40 to prevent the end portion of the tubular body 100A from coming off, the second inner flange portion 49, and the first packing 7.
It can be externally fitted to the main body portion 21 of the tube end core 20 through the 0 and the first inner flange portions 48. Therefore, from this state, the push ring 40 and the joint body 10 are connected to each other by the parallel screws 47,
And the engaging surface 48b of the first inner flange portion 48
Comes into contact with the flange portion 22 and pulls the joint body 10 toward the flange portion 22 side, so that the second packing 80 is attached to the second seat surface 28 and the first seat surface 28.
It is pressed by the seating surface 14 and closely adheres to the seating surfaces 28, 14 to maintain the watertightness of this portion. During and after screwing the push ring 40, the first packing 70 remains in close contact with the packing pressing surface 42 and the outer peripheral surface of the pipe body 100A, and the sealing material 29 of the pipe body 100A and the pipe end core 20. Since the gap between the main body portion 21 and the main body portion 21 is still closed, the watertightness is maintained even in the portion where the first packing 70 and the sealing material 29 are in close contact.

As described above, according to the pipe end anticorrosion mechanical joint according to the embodiment of FIG. 7, the inner passage of the pipe body 100A and the exterior of the pipe body 100A, both when assembled at a construction site of a piping system and when used as a plug joint. Are kept watertight by the sealing material 29 and the first packing 70, and the abutting points of the tube end core 20 and the joint body 10 are kept watertight by the second packing 80. Therefore, the tubular body 10
It cannot happen that the end surface 101A of 0A comes into contact with water flowing through the internal passage of the tubular body 100A to cause rusting.

Other functions in this embodiment are the same as those described with reference to FIGS. 1 and 3.

The retaining action of the retaining ring 50 on the tubular body 100A described with reference to FIG. 6 is the same as that of the embodiment described with reference to FIGS. 1 to 3 and 4 and the embodiment described with reference to FIG. Is also demonstrated.

In addition to the above-described embodiments, the pipe end anticorrosion mechanical joint of the present invention can be implemented in the following modes. (1) In addition to the configuration according to any one of claims 1, 2, 3, 4, and 5, a rubber having a symmetrical shape in the axial direction is used as the first packing. Or, use a rubber O-ring. When this mode is adopted, the directionality of the first packing does not become a problem when the first packing is fitted into the push ring, which is useful when assembled and used at a piping system construction site. (2) In addition to the structure described in any one of claims 1, 2, 3, 4, and 5, the end of the tubular body is chamfered. When this aspect is adopted, the pipe body can be easily inserted into the retaining ring 50 or the first packing when it is used as a plug-in joint. (3) In addition to the configuration according to any one of claims 1, 2, 3, 4, and 5, the outer surface of the push ring is provided with a non-slip unevenness. This has the advantage that the hand and the tool are less likely to slip when the push wheel is temporarily tightened by hand or tightened with a tool such as a wrench. (4) In the configuration described in claim 2 or 3, the parallel screw of the push ring is a male screw and the parallel screw of the joint body is a female screw as described in FIG.

[0041]

According to the inventions described in claim 1, claim 2, claim 3, claim 4 and claim 5, it is not necessary to use many bolts and nuts as tightening parts, and a wrench or the like is used. It is possible to connect the tube to the fitting body with a tool. Therefore, the pipe end anticorrosion mechanical joint of each of these inventions can be suitably used for joining pipes having a small diameter such as a nominal diameter of 1/2 to 2B (B represents inches).

The pipe end anticorrosion mechanical joint of each invention may be assembled and used at a piping system construction site.
Since it can also be used as a plug-in joint, versatility is enhanced. The pipe end anticorrosion mechanical joint can be disassembled, so that it can be reused.

[Brief description of drawings]

FIG. 1 is a side view showing, in a partial cross section, a usage state of a pipe end anticorrosion mechanical joint according to an embodiment of the invention of claims 1, 4 and 5.

FIG. 2 is a side view in which a main part of FIG. 1 is disassembled and a part is shown in a cross section.

FIG. 3 is an enlarged cross-sectional view of a main part of FIG.

FIG. 4 is a side view showing a partial cross section of a modified example of the pipe end anticorrosion mechanical joint according to the embodiment of the invention of claims 1, 4 and 5;

FIG. 5 is an enlarged cross-sectional view of an essential part showing an embodiment of the invention of claims 2, 4 and 5;

FIG. 6 is an enlarged cross-sectional view of a main part for explaining the function of the retaining ring.

FIG. 7 is an enlarged cross-sectional view of a main part showing an embodiment of the invention of claims 3, 4 and 5;

[Explanation of symbols] A pipe end anticorrosion mechanical joint 10 joint body 11 metal tubular body 12 synthetic resin layer 13 parallel screw of joint body 14 first seat surface 20 pipe end core 21 pipe end core body 22 pipe end core Collar portion 27 Packing seat surface 28 Second seat surface 29 Sealing material 40 Push ring 41 Core surrounding surface 42 Packing pressing surface 43 Tapered taper surface 44 First pressing portion (pressing portion) 45 Second pressing portion 46 Cylindrical portion 47 Parallel screw of the push ring 48 First inner collar portion 48a, 49a Packing contact surface 48b Engaging surface 49 Second inner collar portion 50 Retaining ring 60 Retainer 70 First packing 80 Second packing 90 Third packing 100A, 100B Tubing 110A , 110B Steel pipe (metal pipe) 120A, 120B Synthetic resin layer X Protrusion direction of main body

Claims (5)

[Claims] 1. A joint body having parallel threads and having a first seating surface on an end surface thereof, a tubular main body portion capable of being internally fitted to an end portion of the tubular body, and a tubular body provided on the main body portion. A packing seating surface is provided at a predetermined location on a surface that is larger in diameter than the outer peripheral diameter and that is located in the protruding direction of the main body portion, and a second seating surface that is opposite to the packing seating surface and that faces the first seating surface. A pipe end core having a collar portion provided with a seat surface; and a pipe body held at a predetermined position on the outer periphery of the main body of the pipe end core and the main body portion internally fitted to the end portion of the pipe body. A sealing material with elasticity that closes the gap between them, a cylindrical core surrounding surface with a diameter larger than the flange of the pipe end core, a packing pressing surface with a diameter smaller than the core surrounding surface, and a tapered tapered surface. They are formed side by side in this order in the axial direction, and can be axially engaged with the outer peripheral portion of the flange portion of the pipe end core between the core surrounding surface and the packing pressing surface. A stepped first pressing portion is formed, a stepped second pressing portion is formed between the packing pressing surface and the tapered taper surface, and the parallel thread of the joint body is It can be held in a space surrounded by a push ring that has a tubular part with parallel threads that can be screwed and that can be externally fitted to the end of the tube, and can be held in the space surrounded by the packing pressing surface of the push ring, and can be externally fitted to the end of the tube. It can be held in the space surrounded by the first packing that has elasticity and is compressed by the packing pressing surface of the pressed wheel and the tubular body, and the tapered taper surface of the pressed wheel.
A reduced diameter that is interposed between the tapered tapered surface of the push ring externally fitted to the end of the tubular body and the tubular body, and that has an outer peripheral diameter larger than the smallest diameter portion of the tapered tapered surface. Possible retaining ring, a ring-shaped retainer interposed between the first packing and the retaining ring and having an outer peripheral portion axially engageable with the second pressing portion, and a first bearing surface of the joint body. And a second packing interposed between the pipe end core and the second seating surface of the pipe end core, and the second pressing portion axially moves the retainer as the parallel screw of the push ring is tightened to the parallel screw of the joint body. When pressed,
When the retainer compresses the first packing, which is pressed against the packing seat surface of the flange portion of the tube end core, by a predetermined amount in the axial direction, the first pressing portion of the push ring pushes the flange portion of the tube end core in the axial direction. A pipe end anticorrosion mechanical joint characterized in that a total axial length of the retainer and the first packing is determined so as to start. 2. A joint main body having parallel threads and having a first seating surface provided on an end surface thereof, a tubular main body capable of being internally fitted to an end of the tubular body, and a tubular body provided on the main body. End having a flange portion having a second seat surface opposed to the first seat surface at a predetermined location on a surface located on the side opposite to the projecting direction of the main body and having a diameter larger than the outer peripheral diameter of A core and a sealing material having elasticity that is held at a predetermined position on the outer periphery of the main body of the pipe end core and closes a gap between the pipe and the main body fitted inside the end of the pipe. , A cylindrical core surrounding surface with a diameter larger than the flange portion of the pipe end core, a packing pressing surface with a diameter smaller than the core surrounding surface, and a tapered tapered surface are formed side by side in this order in the axial direction. A stepped pressing portion that is axially engageable is formed on the outer peripheral portion of the flange portion of the pipe end core between the packing pressing surface and the joint pressing surface. It has a cylindrical part with parallel threads that can be screwed onto the parallel threads of the body, and can be held in a space surrounded by the pressing ring that can be externally fitted to the end of the tube and the packing pressing surface of the pressing ring. It can be held in the space surrounded by the first packing having elasticity that is compressed by the packing pressing surface of the push wheel and the pipe body that are externally fitted to the end of the body, and the tapered taper surface of the push wheel.
A reduced diameter that is interposed between the tapered tapered surface of the push ring externally fitted to the end of the tubular body and the tubular body, and that has an outer peripheral diameter larger than the smallest diameter portion of the tapered tapered surface. Possible retaining ring, ring-shaped retainer interposed between the first packing and retaining ring, and interposed between the first seat surface of the joint body and the second seat surface of the tube end core The flange is surrounded by the second packing and the flange portion of the tube end core held in a predetermined position on the outer periphery of the flange portion of the tube end core and accommodated in the push ring and the core surrounding surface of the push ring to surround the flange portion and the core. A pipe end anti-corrosion mechanical joint that includes a third packing that closes a gap between the surface and the surface. 3. A joint main body having parallel threads and having a first seating surface provided on an end surface thereof, a tubular main body portion capable of being internally fitted to an end portion of the tubular body, and a tubular body provided on the main body portion. End having a flange portion having a second seat surface opposed to the first seat surface at a predetermined location on a surface located on the side opposite to the projecting direction of the main body and having a diameter larger than the outer peripheral diameter of A core and a sealing material having elasticity that is held at a predetermined position on the outer periphery of the main body of the pipe end core and closes a gap between the pipe and the main body fitted inside the end of the pipe. , A cylindrical core surrounding surface having a diameter larger than the flange portion of the pipe end core, a packing pressing surface, and a tapered tapered surface are arranged in this order in the axial direction, and the core surrounding surface and the packing pressing surface are formed on these surfaces. It is partitioned by the first inner flange portion having a smaller diameter than that of the packing, and the packing pressing surface and the tapered taper surface are smaller in diameter than the packing pressing surface. The first inner flange portion is partitioned by the second inner flange portion, and the surface of the first inner flange portion on the packing pressing surface side is a packing contact surface, and the surface opposite to the packing contact surface is an engagement surface for the flange portion of the pipe end core. The second inner flange portion has a packing pressing surface side as a packing contact surface, and includes a tubular portion having parallel threads that can be screwed into the parallel threads of the joint body, and the end of the tube body. Can be held in a space surrounded by a push ring that can be externally fitted to the end, a packing pressing surface of the push wheel, and the first and second inner flange portions, and the packing can be pressed by the push wheel that is externally fitted to the end of the tubular body. It can be held in the space surrounded by the first packing that is elastically compressed by the surface and the tubular body, the tapered taper surface of the push ring and the second inner flange portion, and is externally attached to the end portion of the tubular body. It is interposed between the tapered taper surface of the fitted push ring and the pipe, and A retractable retaining ring having an outer peripheral diameter larger than the small diameter portion, and a second packing interposed between the first seating surface of the joint body and the second seating surface of the tube end core. A pipe end anticorrosion mechanical joint characterized by being provided. 4. The tube body is an inner surface coated tube in which the inner surface of a metal tube is coated with a synthetic resin layer, claim 1, claim 2, claim 3.
The pipe end anticorrosion mechanical joint according to any one of 1. 5. The pipe end anticorrosion mechanical joint according to claim 4, wherein the joint body is formed by coating the inner surface of a metal tubular body with a synthetic resin layer.