JP2556088Y2 - Pipe connection structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure for pipes such as water pipes, and more particularly to a connection structure for connecting one end of one pipe having no flange to another end provided with an integral flange. .

[0002]

2. Description of the Related Art Conventionally, a water pipe is generally connected by a so-called flange joint method in which flanges welded to the ends of the pipes to be connected are abutted with each other via a packing and tightened by bolts for connection.

In the case of this method, it is necessary to have connecting flanges at ends of pipes to be connected. However, the required length of the pipe changes depending on the situation at the construction site. For this reason, the flange at one end can be welded in advance at a factory or the like, but if it is welded to the other end in advance, it will not be possible to cope with dimensional changes. The actual situation is that welding is performed at the piping construction site.

As a result, the work becomes very complicated, inefficient, and the work efficiency is poor. In addition, particularly in the case of relatively thin stainless steel pipes, which are frequently used recently, it is difficult to weld the flange, and welding cannot be performed because a large welding machine cannot be brought into a narrow place to carry out welding. It was perfect, and leakage from the connection portion was easy to occur, and there was also a problem in durability.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned drawbacks of the conventional pipe connection method, and is simple and robust at the construction site according to the length of the pipe. It is an object of the present invention to provide a pipe connection structure that can connect the pipes and has excellent sealing performance and durability of the connection portion.

[0006]

In order to solve the above problems, the pipe connection structure of the present invention connects one pipe end having no flange and the other pipe integrally formed with a connection flange. In the connection structure, an outer surface is tapered at an end of the one pipe, an inner surface is a smooth straight circumferential surface, and a connection ring having a tapered inner circumferential surface fitted to the tapered surface of the sleeve. , fitted as large diameter side of the tapered surface is the mating pipe side, the
With the end of the sleeve in contact with the end face of the connection flange
In this configuration, the connection flange and the connection ring are fastened and fixed by bolts.

[0007]

[Action] According to the situation at the construction site, one pipe is cut to a predetermined length, a connection ring and a sleeve are fitted, and a connection bolt is inserted into the connection ring and the connection hole of the connection flange at the other pipe end. When tightened, the end surface of the sleeve hits the outer surface of the connecting flange and is prevented from moving, so that the tapered inner surface of the connecting ring moves along the tapered outer surface of the sleeve, gradually tightening the sleeve.

As a result, the inner peripheral surface of the sleeve and the outer peripheral surface of the pipe are pressed against each other, and the pipe is firmly connected.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a sectional view showing a state in which the pipe of the present invention is connected, and FIG. 2 is an exploded sectional view thereof. In the figure,
Reference numeral 1 denotes one pipe of a water supply or the like, which has a cut end cut to a required length according to the situation at the site. Reference numeral 2 denotes the other pipe connected to the pipe 1 such as an elbow pipe. The inside diameter near the end of the pipe is large enough to insert one pipe 1 to be connected. The flange 3 is fixed by welding or the like.

The connection flange 3 is provided with a plurality of connection holes 5 through which connection bolts 6 are inserted. Reference numeral 7 denotes an O-ring, which seals a fitting portion between the pipe 1 and the pipe. Reference numeral 8 denotes a sleeve whose inner surface 9 has an inner diameter that fits the outer diameter of the one pipe 1 and whose outer surface 10 is tapered. The sleeve 8 needs to be slit in the axial direction so that the inner diameter of the sleeve 8 is reduced when the sleeve 8 is engaged with the connection ring and the sleeve 8 is pressed against the pipe.

Reference numeral 12 denotes a connecting ring, and an inner surface 13 is formed on a tapered surface having the same taper angle so that the inner surface 13 can be frictionally fitted with the outer surface 10 of the sleeve 8, and the outer diameter thereof is equal to the outer diameter of the connecting flange 3. A connection hole 14 is formed at a position corresponding to the connection hole 5 of the flange.

[0013] With the above components, the pipe 1
Is connected to the pipe 2 as follows.

First, the connection ring 12 is fitted to the pipe 1 such that the tapered surface opens toward the end. Subsequently, as shown, the sleeve 8 is fitted to the pipe 1 such that the tapered surface is fitted to the tapered surface of the connection ring. In such a state, the end of the pipe 1 is inserted into the O-ring 7
And the end face 11 of the sleeve 8 is brought into contact with the end face 4 of the connection flange 3 to fit the connection ring to the outer peripheral surface of the sleeve. In this state, when the connection bolt 6 is inserted into the connection hole of the connection ring and the connection flange and tightened, the tapered inner surface of the connection ring is connected to the tapered outer surface of the sleeve because the end face of the sleeve is engaged with the outer surface of the connection flange. Move along and gradually tighten the sleeve. As a result, the inner peripheral surface of the sleeve is pressed against the outer peripheral surface of the pipe 1, and the pipe 1 and the pipe 2 are firmly connected.

FIG. 3 shows another embodiment of the present invention. In this embodiment, by connecting a short connecting pipe member prepared in advance, both connecting pipes can be connected without providing a flange. It has become.

In FIG. 1, reference numeral 20 denotes a connecting pipe member having inner diameters at both ends substantially equal to the outer diameters of pipes 30 and 31 to be connected, and connecting flanges 22 and 23 formed at both ends.

In this embodiment, the inner diameter of the central portion 21 is formed substantially equal to the inner diameter of the connecting pipe.
Although the positioning at the time of fitting the pipes to be connected is facilitated, the connecting pipe members may be formed straight and the pipe end faces may be brought into contact with each other. Reference numerals 25 and 26 denote sleeves similar to those in the above embodiment, and reference numerals 27 and 28 denote connection rings.

In this embodiment, the connecting rings 27 and 28 and the sleeves 25 and 26 are fitted to the ends of the connecting pipes 30 and 31, respectively.
0, 31 are inserted into both ends of the connection pipe member 20, and the connection ring 27 and the connection flange 22 are connected in the same manner as in the previous embodiment.
By connecting and fixing the connection ring 28 and the connection flange 23 with bolts, respectively, the two pipes are firmly connected via the connection pipe member by a taper action.

According to this embodiment, if the connecting pipe member is prepared in advance as a component, there is no need to weld a flange to the connecting pipe, so that the pipe can be connected more efficiently. Although not shown,
If an O-ring is interposed between the inner peripheral surface of the connecting pipe member and the outer peripheral surface of the pipe fitted to it, as in the above-described embodiment, more sealing can be achieved.

Although the connecting pipe member is straight in the illustrated embodiment, it is convenient if a plurality of kinds such as bent appropriately are prepared.

[0021]

[Effects of the Invention] As described above, according to the present invention, it is possible to easily connect a pipe cut to an appropriate length without welding a flange at a piping site as in the related art.
Piping work efficiency can be dramatically improved.
Since the connection portion is connected by fitting a pipe, sealing is further achieved, and further, since there is no need to interpose packing, there is durability.

Further, the sleeve is partially in a just ring is slit, its internal surface is Ri Do a circular straight, and is abutted against the end face of the connection flange when connected
So that when tightening, the sleeve axis
There is no movement in the direction, the outer surface of the pipe is not flawed, the shape and structure are much simpler, and the assembling is easy as compared with the case where the inner surface is provided with a blade shape in two.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a pipe connecting portion according to an embodiment of the present invention.

FIG. 2 is an exploded view of the above.

FIG. 3 is a front sectional view of a pipe connecting portion according to another embodiment of the present invention.

[Explanation of symbols]

 1, 2, 30, 31 Pipe 3, 22, 23 Connection flange 5, 14 Connection hole 6 Connection bolt 8, 25, 26 Sleeve 12, 27, 28 Connection ring 20 Connection pipe member

Claims (1)

(57) [Scope of request for utility model registration] 1. A connecting device for connecting an end of one pipe having no flange and the other pipe integrally formed with a connecting flange, wherein the end of the one pipe has a tapered outer surface, A sleeve whose inner surface is a smooth straight circumferential surface, a part of which is provided with a slit in the axial direction and which can be freely enlarged and reduced, and a connection ring having a tapered inner peripheral surface fitted to the tapered surface of the sleeve. , fitted as large diameter side of the tapered surface is mating pipe side, the Sri
A pipe connection structure in which the connection flange and the connection ring are fastened and fixed with bolts in a state where the end of the valve is in contact with the end face of the connection flange .