JPH0753024Y2 - Victoric pipe fittings - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint, and more particularly to a victoric pipe joint for connecting a pair of pipe ends having a corrosion-resistant resin lining.

2. Description of the Related Art In a pipe for supplying tap water, for example, chlorine added to prevent deterioration of water quality corrodes the inside of the pipe and the pipe joint, and red water containing rust is generated due to corrosion of the inner surface of the pipe. There is a disadvantage that the inner surface of the pipe is corroded and the passage of tap water is extremely deteriorated. Therefore, in order to prevent corrosion, a lining pipe having a resin and a corrosion-resistant layer of a resin lining on both inner and outer peripheral surfaces of the pipe and the pipe joint is now widely used as a water supply pipe.

FIG. 4 shows a cross section of a victorique type pipe joint 1 for connecting the connecting pipes 8 and 9 having the inner peripheral surfaces with the resin linings 8a and 9a. The pipe joint 1 has a pair of semi-annular housings 2 fixed over the outer peripheral surfaces of the respective ends of the connection pipes 8 and 9, and the pair of housings 2 are connected to the connection pipes 8 and 9 by bolts 3 and nuts 4.
Fixed on top. Claws 5 that engage with annular grooves (groups) 8b and 9b formed at the ends of the connecting pipes 8 and 9 are provided at both ends of the housing 2.

Further, an annular elastic packing 6 that is in close contact with the inner peripheral surfaces of the pair of housings 2 is provided on the connecting pipes 8 and 9. In order to secure the sealing property of the connecting portion of the connecting pipes 8 and 9,
Sealing portions 6a, which are in close contact with the outer peripheral surface of the end portion of 9, are provided on both side edges of the elastic packing 6.

Problems to be Solved by the Invention The connecting pipes 8 and 9 provided with the resin linings 8a and 9a shown in FIG. 4 are appropriately cut to a required length at a construction site. When the pipe ends are connected by the pipe joint 1 in a state where the connecting pipes 8 and 9 are cut and the pipe end faces 8c and 9c are exposed, the pipe end faces 8
Corrosion progresses from the exposed metal parts of c and 9c, which causes the above-mentioned inconvenience. Further, when the seal portions 6a on both side edges of the elastic packing 6 do not come into close contact with the outer peripheral surfaces of the end portions of the connecting pipes 8 and 9, effective sealing performance cannot be obtained.

Therefore, an object of the present invention is to provide a victoric pipe joint that protects the pipe end surface of the connecting pipe from corrosion and obtains effective sealing performance.

Means for Solving the Problems A victoric pipe joint according to the present invention straddles each end of a pair of connecting pipes (20, 21) and engages with an annular groove (20a, 21a) provided at each end. And a pair of semi-annular housings (11) each having a hook portion (11b)
1) An annular elastic packing (40) interposed between the connecting pipe (20, 21) and an annular core (30) fitted to each end of the pair of connecting pipes (20, 21). It has and. The annular core (30) has a fitting portion (31) fitted to the inner peripheral surfaces of the ends of the connecting pipes (20, 21), and extends radially outward from the fitting portion (31) and connects to the connecting pipe (31). Flange part (3
2) With and. The elastic packing (40) has a neck (4
1) a pair of recesses (43) and a pair of recesses (43)
The inner protrusion (42) formed between the neck and each neck (4
1) has a lip portion (41a) formed at the tip thereof. Each lip portion (41a) is in close contact with the outer peripheral surface of the pair of connecting pipes (20, 21) to form an outer seal portion. Inner protrusion (42)
The front end (42a) of the flange (3) of each annular core (30).
The inner seal part is formed in close contact with each end face (32a) of 2). Each lip portion (41a) and the inner protruding portion (42) are attached to each end surface (32a) of the flange portion (32) of each annular core (30) and the outer peripheral surface of the connecting pipe (20, 21) by the neck portion (41). Elastic and close.

Action The outer seal part is formed by the lip part (41a) and the inner seal part is formed by the inner projecting part (42). Therefore, the double seal part consisting of the outer seal part and the inner seal part prevents the fluid flow in the pipe joint. Leakage can be surely prevented. Further, the pipe end faces (20b, 21b) of the connecting pipes (20, 21) are covered with the fitting part (31) and the flange part (32) of the annular core (30), and the pipe end faces of the connecting pipes (20, 21) ( Corrosion of 20b, 21b) can be prevented. In addition, elastic packing (4
The inner protrusion (42) of the neck portion (41) of (0) has optimum elasticity and is in close contact with each end surface (32a) of the flange portion (32) of the annular core (30) to connect the connecting pipes (20, 21). Effective sealing performance of the part can be obtained.

Embodiment An embodiment of the victoric pipe joint according to the present invention will be described below with reference to FIGS.

As shown in FIGS. 1 to 3, a victoric pipe joint 10 according to this embodiment has an annular core 30 and resin-molded annular core 30 fitted to the ends of the connecting pipes 20 and 21. An elastic packing 40 made of rubber attached to the outside of the elastic packing 40, and a pair of casting housings 11 having a symmetrical semi-annular shape fixed to the outside of the elastic packing 40. Each housing 11
Is a flange portion 11a extending radially outward and the housing 11
And claw portions 11b formed on both side portions thereof. Housing 1
When fixing 1 across the two connecting pipes 20 and 21, the claw portion 11b
Is an annular groove provided near each end of the two connecting pipes 20 and 21.
It is possible to prevent the connecting pipes 20 and 21 from falling off the pipe joint 10 by being engaged with the 20a and 21a. Each annular groove of connecting pipes 20 and 21
The groove width dimension of 20a and 21a is slightly wider than the width dimension of the claw portion 11b of the housing 11. That is, as shown in FIG.
The distance between the outer walls of the annular grooves 20a, 21a is larger than the width W of b, and when the claw portion 11b is engaged with the annular grooves 20a, 21a, a gap is created between them. Due to this gap, the pair of housings 11 can be easily attached to the connecting pipes 20 and 21. A corrosion resistant layer is formed by a resin lining 22 on the inner peripheral surfaces of the connecting pipes 20 and 21. Pass the bolt 12 through the through hole (not shown) formed in the flange 11a, and attach the nut to the bolt 12
It is possible to fasten the pair of housings 11 on the connecting pipes 20 and 21 by tightening.

The annular core 30 having an L-shaped cross section includes a fitting portion 31 mounted on the inner surface of the resin lining 22 of the connecting pipes 20 and 21, and a flange portion 32 projecting radially outward from the fitting portion 31. . The flange portion 32 is in contact with the pipe end faces 20b and 21b of the connecting pipes 20 and 21 and the end faces of the resin lining 22. End face 32a of flange 32
The projecting length of is approximately the same diameter as the outer peripheral surface of the connecting pipes 20 and 21.

As shown in FIG. 3, an elastic packing 40 molded in a ring shape with rubber or elastic resin is formed between a pair of concave portions 43 forming a neck portion 41 and a pair of concave portions 43 and in a radial direction. It has an inner protruding portion 42 protruding inward and a tongue-shaped lip portion 41a formed at the tip of each neck portion 41. As shown in FIG. 1, the neck portion 41 including the lip portion 41a is in close contact with the inner peripheral surface of the housing 11 and the outer peripheral surfaces of the connecting pipes 20 and 21. Each lip portion 41a is in close contact with the outer peripheral surface of the pair of connecting pipes 20 and 21 to form an outer seal portion. The inner protruding portion 42 is in close contact with each end surface 32a of the flange portion 32 of each annular core 30 to form an inner seal portion. Each lip portion 41a and the inner protruding portion 42 are formed by a pair of recesses 43 and each end surface of the flange portion 32 of each annular core 30.
It comes into close contact with the outer peripheral surfaces of 32a and the connecting pipes 20 and 21 with appropriate elasticity. The protruding length of the tip end portion 42a of the inner protruding portion 42 is such that it abuts against the end surfaces 32a of the flange portions 32 of the pair of annular cores 30 with an appropriate elastic force.

Each of the connecting pipes 20 and 21 is cut into a predetermined size, and the pipe end surfaces 20b and 21b facing each other expose the metal surface of the pipe body and the cut surface of the resin lining 22. The annular core 30 is fitted into the pipe ends of the respective connecting pipes 20 and 21 by pressing or press fitting, the fitting portion 31 is brought into close contact with the inner peripheral surface of the resin lining 22, and the flange portion 32 is formed into the pipe end surface.
The end faces of 20b, 21b and the resin lining 22 are brought into contact with and brought into close contact with each other. When connecting the two connecting pipes 20, 21, the connecting pipe 20,
21 pipe ends are arranged opposite to each other, and a pair of annular cores
The respective flange portions 32 of 30 are arranged so as to face each other.

In this state, after mounting the elastic packing 40 on the outer circumferences of the pipe ends of the connecting pipes 20 and 21, the pair of housings 11 are mounted from above the elastic packing 40. At this time, an appropriate gap C is provided between the flange portions 32 of the annular core 30 so that the pair of housings 11
A good assembling workability is obtained when the is attached to the connecting pipes 20 and 21. Then, the housing 11 is fastened with the bolt 12 and the nut.

When the bolt 12 and the nut are tightened, the tip end surface 42a of the inner protruding portion 42 of the elastic packing 40 comes into close contact with each end surface 32a of the two flange portions 32 juxtaposed with appropriate elasticity to form an inner seal portion. Further, each lip portion 41a is in close contact with the outer peripheral surfaces of the pair of connecting pipes 20 and 21 to form an outer seal portion. The lip portions 41a and the inner protruding portions 42 elastically come into close contact with the end surfaces 32a of the flange portions 32 of the annular cores 30 and the outer peripheral surfaces of the connecting pipes 20 and 21 due to the elastic deformation of the neck portion 41.

In the present invention, the double seal portion including the outer seal portion formed by the lip portion 41a and the inner seal portion formed by the inner protruding portion 42 can reliably prevent fluid leakage at the pipe joint. Further, the pipe end faces 20b and 21b of the connecting pipes 20 and 21 are connected to the annular core 30.
Is covered with the fitting portion 31 and the flange portion 32 of the connection pipe 20,
It is possible to prevent corrosion of the tube end faces 20b, 21b of 21. Further, the inner protrusion 42 is formed by the pair of recesses 43 of the elastic packing 40.
Has the optimum elasticity with the flange portions 32 of the pair of annular cores 30.
An effective sealing performance of the connecting portion of the pair of connecting pipes 20 and 21 is obtained in close contact with the respective end surfaces 32a. Since the gap C is hermetically or liquid-tightly sealed by the close contact between the inner protrusion 42 and the end faces 32a of the flanges 32, it is possible to prevent the fluid from leaking through the gap C.

Effects of the Invention As described above, in the vitric type pipe joint according to the present invention, the double seal portion of the inner seal portion and the outer seal portion surely prevents the leakage of fluid in the pipe joint and the pipe of the connecting pipe. Since corrosion of the end faces can be prevented, the reliability of the pipe joint can be improved and the life of the connecting pipe can be greatly extended.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of a victoric pipe joint according to the present invention mounted on a pair of connecting pipes, FIG. 2 is a sectional view of an annular core, and FIG. 3 is a side sectional view of an elastic packing.
FIG. 4 shows an assembled side sectional view of a conventional victoric pipe joint. 10 …… Pipe joint, 11 …… Housing, 20, 21 …… Connection pipe,
20a, 21a ... Annular groove, 20b, 21b ... Pipe end face, 30 ... Annular core, 31 ... Fitting part, 32 ... Flange part, 32a ... End face, 40 ... Elastic packing, 41 ... Neck Part, 42 ... Inward protruding part, 43 ... recessed part

Claims (1)

[Scope of utility model registration request] 1. A pair of semi-annular housings each having a claw portion that straddles each end of a pair of connecting pipes and engages with an annular groove provided at each end, and between the housing and the connecting pipe. An annular elastic packing to be interposed and an annular core fitted to each end of the pair of connecting pipes are provided, and the annular core is a fitting part fitted to the inner peripheral surface of the end of the connecting pipe. And a flange portion that extends outward in the radial direction from the fitting portion and that abuts on the end surface of the connecting pipe, the elastic packing includes a pair of concave portions that form a neck portion and a pair of concave portions. Has an inward protruding portion formed on each of the neck portions, and a lip portion formed at the tip of each neck portion. Each lip portion is in close contact with the outer peripheral surface of the pair of connecting pipes to form an outer seal portion. The tip of each part closely contacts each end face of the flange part of each annular core to form the inner seal part. And, Vic trick type pipe joint, characterized in that each lip and the inner protrusion closely with the elastic to the outer peripheral surface of each end surface and the connecting tube of the flange portion of each annular core by the neck.