JPS6040945Y2 - fluid pipe fittings - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is applicable to pipe joints, and more specifically, it is applicable not only to connecting rigid pipes such as cast iron pipes, but also to flexible flexible pipes such as synthetic resin pipes and steel pipes. This invention relates to a structure of a joint part that is easy to manufacture and easy to operate, and is suitable for use in connecting pipes.

[Conventional technology]

Looking at conventional joints, in the mechanical joint shown in Fig. 3, the push ring 04 and backing 03 are loaded into the insertion tube 02 in advance, and after the insertion tube is inserted into the socket tube 01, the backing ring is inserted into the socket tube 01. This method has the advantage that the handling work at the time of connection is simple, just tightening the bolts, and there is no need to chamfer the end 021 of the insertion tube. The drawback is that the sealing effect is gradually lost due to the deterioration of the roughtance of the backing glue.

In addition, since this mechanical type is strongly tightened by a push ring, both the socket tube and the insertion tube must be rigid tubes.

It also has the disadvantage that its applications are limited.

On the other hand, the socket joint that holds the backing shown in FIG.
The water stop part (so-called valve part) 032' of the backing is held in the recessed part 011' of 1', and the water stop part (so-called valve part) 032' is accommodated in the space of the socket part, and the sealing action of the joint part is carried out between the socket part and the socket part. When water pressure is applied within the free space 015' between the part 02' and the backing, the backing deforms, and due to the so-called self-sealing effect of the backing, the more water pressure is applied, the more it adheres to the inner peripheral surface of the socket part and the outer peripheral surface of the insertion part. , which has a good water-stopping effect.

Moreover, since there is no undue stress over a long period of time, it does not deteriorate, and has a sealing effect superior to mechanical joints.

However, in this type of socket joint that holds a self-sealing backing, when inserting the socket, the end 021' of the socket tube is It is necessary to chamfer the edges, which poses manufacturing difficulties.

In addition, when inserting the receptacle into the receptacle, it is necessary to accurately center the two, which requires a special centering tool.

[Purpose of this invention]

This invention incorporates the strengths of each of these two types of joints by applying special innovations, and provides a new joint that eliminates the drawbacks and is extremely useful in terms of expanded uses. The purpose is (technical issue).

[Structure of the present invention]

Since the joint of the present invention is distantly related to the above purpose, it has the following configuration (
technical measures).

That is, (1) a socket portion having a backing accommodation space formed by an inner circumferential side wall and an inner vertical wall; (2) an insertion portion inserted into the socket portion; and (2) an inner diameter that is the same as an outer diameter of the insertion portion. a hollow annular backing having a required wall thickness, the outer diameter of which is substantially equal to the diameter of the inner circumferential side wall of the socket; The tightening is performed by fitting the backing into the backing accommodation space in the fixed position,
The press ring has a backing pressing end surface that maintains a distance to the inner vertical wall substantially equal to twice the wall thickness of the backing.

[Effect]

By adopting the above configuration, the backing loaded in the backing storage space of the socket is pressed by the tip surface of the push ring, and the backing is substantially twice the thickness of the backing against the inner vertical wall of the socket. It is compressed to a width of

[Example] This invention will be explained in more detail based on the example shown in FIGS. 1 and 2.

Figure 1 is a drawing showing the fixed position of the joint flat part,
Reference numeral 1 denotes a socket at the end of the tube, and on the inner surface of the socket, an inner circumferential side wall 11. An inner vertical wall 12 is provided, which walls 11 and 12 form a backing receiving space 13.

Reference numeral 2 denotes an insertion portion of one of the pipes, and 3 a hollow annular backing particularly applied to the joint structure of the present invention, the outer diameter of which is substantially equal to the diameter of the inner circumferential side wall 11 of the reception portion. equally,
The inner diameter is substantially equal to the outer circumferential diameter of the insertion port 2, where a indicates its wall thickness and b indicates the diameter of its hollow portion.

4 is a pressing ring, which has a backing pressing tip surface 41;
The push ring is tightened via bolts 5.

In particular, the feature of the present invention is that the backing 3 loaded in the backing accommodation space 13 of the socket is pressed by the tip end surface 41 of the push ring, and is substantially separated from the inner vertical wall 12 of the socket. The purpose is to compress it to a width twice the wall thickness a, and to take the most effective sealing position.

That is, when tightening is performed, the distance between the inner vertical wall 12 of the socket and the tip end surface 41 of the press ring is substantially equal to twice the thickness a of the backing.

Next, the functions of these components will be explained based on the connection procedure shown in FIG.

(1) For connection, attach the press ring 4 and backing 3 to the socket 2 in this order (see Figure 2).

(2) After inserting the insertion part 2 into the socket part 1, the tip end surface 41 of the press ring is applied to the backing 3, and the backing 3 is advanced into the backing accommodation space 13 of the socket part.

Since the backing 3 is substantially loosely inserted into the backing accommodation space 13, it is smoothly pushed into the accommodation space 13 (see the opening in FIG. 2).

(3) When the push ring 4 is further advanced, the front end of the backing 3 hits the inner vertical wall 12, and the backing 3 is compressed by the tip surface 41 of the push ring that is pushed further, and the hollow part of the backing is crushed in the tube axis direction. At the same time, the inner and outer end surfaces of the backing 3 in the radial direction are brought into close contact with the inner circumferential side wall 11 of the receptacle and the outer circumferential surface of the receptacle 2, respectively.

After that, tighten the push ring 4 with the bolt 5 in the position shown in Figure 1.
will be fixed to the socket part 1.

[Effects of this invention]

Since the joint structure of the present invention is implemented with the above-described configuration and procedure, it has the following various superior effects compared to conventional joint structures.

■ At the time of connection, the push ring and backing are attached to the pusher joint in advance, and then the push ring is pushed in, which is the so-called mechanical joint procedure, so there is no need to chamfer the ends of the connecting pipes, which is an advantage of mechanical joints, which is costly, and the push ring is not required. Since it abuts against the outer end of the pipe socket, simple tightening with bolts can be performed.

In addition, strong tightening like mechanical joints is not required.

■ The backing has an inner diameter that is substantially equal to the outer diameter of the socket, and an outer diameter that is substantially equal to the diameter of the inner circumferential side wall of the socket, so it will not fit loosely into the socket. The backing is loosely inserted into the mouth, and the backing is smoothly pushed into the backing accommodation space of the socket by only being lightly pushed by the push ring.

■ When the backing is compressed by the tip end of the push ring and the vertical inner wall of the socket, it easily deforms due to the presence of the hollow part.
It expands in the radial direction of the tube, and its radially outer and inner surfaces are tightly adhered to the inner circumferential side wall of the socket and the outer circumferential surface of the socket, providing an excellent sealing effect.

■ The tightening is in place, and the backing has sufficient elasticity in the direction of the pipe axis, so it has a self-sealing effect against the fluid pressure inside the fluid pipe, and the more water pressure is applied, the more the backing tightens the pipe diameter. It deforms in this direction, increasing the water-stopping effect.

Therefore, no unreasonable stress is generated on the backing, and there is no deterioration of the backing.

[Brief explanation of drawings]

Figures 1 and 2 are drawings showing the joint of the present invention. Figure 1 is a longitudinal cross-sectional view of the joint of the present invention with tightening in place, Figure 2 is a diagram showing the connection procedure, and Figure 2 is a diagram showing the connection procedure. 3 and 4 are drawings showing a conventional joint. 1...Socket part, 11...Inner peripheral side wall,
12...Inner vertical wall, 13...Backing accommodation space, 2...Insertion port, 3...
Hollow backing, 4... Press ring, 41...
・Backing pressing tip surface.

Claims (1)

[Claims for Utility Model Registration] A socket part 1 having a backing accommodation space 13 formed by an inner circumferential side wall 11 and an inner vertical wall 12, an insertion part 2 inserted into the socket part 1, The inner diameter is substantially equal to the outer diameter of the socket part 2, and the outer diameter is the inner circumferential side wall 11 of the socket part 1.
A hollow annular backing 3 having a required wall thickness a, which is substantially equal to the diameter of a press ring 4 fitted therein and having a backing pressing end surface 41 that maintains a distance to the inner vertical wall 12 substantially equal to twice the wall thickness of the backing 3; pipe joint.