JP2023136405A - pipe joint structure - Google Patents

Abstract

To provide a pipe joint structure capable of connecting pipes even if being different in material quality and diameter in easy work.SOLUTION: A ring-body-shaped cover body 1 is provided to be mounted on the end outer periphery of a connection pipe P. A joint body 2 is provided which is fixed to the cover body 1 and crimped and fixed to the internal end of the connection pipe P. A packing 6 is provided which is placed between the connection end of the connection pipe P and the joint body 2. The cover body 1 is crimped and fixed to the outside face of the connection pipe P. The connection end of the connection pipe P is crimped to the packing 6 to connect the connection pipes P.SELECTED DRAWING: Figure 1

Description

The present invention relates to a pipe joint structure that allows easy connection even when pipes have different materials and diameters.

Types of pipe fittings are configured according to the material of the piping, such as steel pipes or resin pipes, and the outside diameter of the pipe, so for piping work, it is suitable for pipes of the same type, different types, same diameter pipes, and different diameter pipes. Many different types of pipe fittings are required.

For example, Patent Document 1 describes a joint structure used when arranging ductile pipes. In this pipe joint structure, the tip of the trailing pipe 2 is inserted into the rear end of the leading pipe 1, and a sealing rubber ring 3 is press-fitted into the gap between the inner peripheral surface of the leading pipe 1 and the outer peripheral surface of the trailing pipe 2. In this state, the flange 12 of the leading pipe 1 and the flange 52 of the trailing pipe 2 are joined using a large number of tightening bolts 40 and nuts 41.

Further, Patent Document 2 proposes a pipe joint structure for connecting resin pipes. In this pipe joint structure, a connecting joint member 2 is arranged around the outer circumference of the connecting end of the pipe, and a sealing member is inserted into the gap formed between the inner circumferential surface of the connecting joint member 2 and the outer circumferential surface of the pipe. A member 6 is provided. Furthermore, it is provided with a pushing mechanism 8 that pushes the sealing member 6 into the gap and fixes it. When pushing the sealing member 6 into the gap using this pushing mechanism 8, four bolts 10 are used at each end of the pipe.

On the other hand, Patent Document 3 discloses a pipe joint structure for connecting pipes made of different metals. This pipe joint is designed to prevent corrosion caused by a potential difference generated in the contact portions of different metals, and has a structure in which a resin sleeve 2 is interposed between the contact portions.

Further, Patent Document 4 describes a pipe joint structure for connecting resin pipes made of different materials. In this pipe joint structure, the annular groove 7 and the annular protrusion 8 are fitted into each other, and the entire circumference of the fillet between the outer peripheral surface 5 of the first tube T1 and the end surface 4 of the first flow path block B1 is welded. .

Japanese Patent Application Publication No. 2004-100761 Patent No. 6419436 Utility Model Publication No. 2-62193 Japanese Patent Application Publication No. 2007-78069

As described above, various pipe joint structures have been proposed for conventional pipe joints to connect pipes of the same type, pipes of different types, pipes of the same diameter, pipes of different diameters, and the like. In addition, it was necessary to prepare a wide variety of products compatible with these various connecting pipes at the site.

Moreover, the joint structure described in Patent Document 1 uses a large number of bolts 40 and nuts 41 to connect the flange 12 of the leading pipe and the flange 52 of the trailing pipe, which requires a lot of effort for the joint work. It was necessary. In other words, in order to connect these bolts 40 and nuts 41, the bolts 40 must be tightened around the pipe in the longitudinal direction of the pipe, which may be difficult depending on the state of the pipe installation. There was an inconvenience.

In addition, since the sealing rubber ring 3 is press-fitted into the gap between the inner circumferential surface of the leading pipe 1 and the outer circumferential surface of the trailing pipe 2, it is possible to connect a ductile pipe, but the end of the resin pipe is Connection cannot be made because there is a risk of crushing or the like.

On the other hand, even with the joint structure described in Patent Document 2, it is necessary to connect a large number of bolts 10 around the ends of the pipes to be connected, which may make the tightening work difficult depending on the installation situation of the pipes. . Furthermore, since this joint structure utilizes the flexure of resin piping for connection, it is not possible to connect metal piping.

Further, although Patent Document 3 allows connection of dissimilar metals, and Patent Document 4 allows connection of dissimilar resin materials, it is not possible to connect metal pipes and resin pipes. Furthermore, with these pipe joints, it is difficult to connect pipes with different diameters.

Therefore, the present invention was created in view of the existing circumstances as described above, and it is possible to easily connect not only pipes made of different materials but also pipes with different diameters. Our goal is to provide a pipe joint structure that is possible.

In order to solve the above-mentioned problems, the first means of the present invention includes a cylindrical cover body 1 attached to the outer periphery of the connection end side of the connection pipe P, and a cover body 1 attached to the end of the cover body 1. It includes an annular joint main body 2 to be fixed, and a packing 6 interposed between the connecting end of the connecting pipe P and the joint main body 2, and the connecting pipe P with the connecting end of the connecting pipe P crimped to the packing 6. The main feature is that the cover body 1 is fixed to the outer surface of the pipe P and the connecting pipes P are connected to each other.

In the second means, the joint body 2 is fixed to one end of the cover body 1, and a locking flange 1A is protruded from the outer periphery of the other end of the cover body 1, and the joint body 2 is locked to the locking flange 1A. A main body band 5, a fixing ring 3 fixed to the outer periphery of the connecting pipe P, and a wedge ring 4 attached to the outer periphery of the connecting pipe P between the fixing ring 3 and the main body band 5,
A wedge body 4A is provided protruding from a part of the side surface of the wedge ring 4 and has a tapered surface 4Aa in the form of a side ridge that slopes along the longitudinal direction of the connecting pipe P, and a wedge body 4A is provided separately and protrudes from the side surface of the connecting portion of the main body band 5. and a wedge body 5A having a pair of tapered surfaces 5Aa overlapping the tapered surface 4Aa of the wedge ring 4 from above and below,
When the tapered surfaces 4Aa and 5Aa of the wedge body 4A and the wedge body 5A are overlapped and the body band 5 is tightened, the connecting end of the connecting pipe P is attached to the packing 6 via the wedge ring 4 and the fixing ring 3. It is configured to be crimped onto the

In the main body band 5 of the third means, a pair of vertically separated band-like bodies 5B are connected by a pair of connecting screws 5C vertically passing through the pair of left and right wedge bodies 5A, respectively, and the fixing ring 3 is a ring. The connecting bodies 3A formed in the openings of the connecting bodies 3A are connected by fixing screws 3B passing through the upper and lower sides.

The wedge ring 4 of the fourth means is provided so as to be freely connectable to the fixed ring 3, and is located on the outer periphery of the wedge ring 4 at a position where it is locked to the open end of the cover main body 1 on the locking flange 1A side. The mating protrusion 4B is formed to be freely retractable.

The joint main body 2 of the fifth means is formed so that the connecting end portions connect the connecting pipes P having the same diameter or different diameters.

The joint main body 2 of the sixth means is formed so as to connect the connecting pipes P whose connection ends are inclined.

As described above, the present invention has a structure in which the cover main body 1 is attached to the connecting end of the connecting pipe P, and the connecting pipes P are connected to each other via the joint main body 2 fixed to the cover main body 1 and the packing 6. Even pipes of different materials and diameters can be easily connected. As a result, it is no longer necessary to prepare many types of pipe joints in advance as in the past, and extremely rational and efficient inventory management has become possible.

Further, the main body band 5 is connected by a pair of connecting screws 5C passing through the wedge body 5A vertically, and the fixing ring 3 is connected by a fixing screw 3B passing vertically through the connecting body 3A. Connection work is done from one direction perpendicular to the . As a result, the connection work is not affected by the installation status of the pipes, and the number of screw fixing work is reduced, making the work extremely easy.

Further, the wedge ring 4 is provided so as to be freely connectable to the fixed ring 3, and a positioning projection 4B which is engaged with the open end side of the cover main body 1 is formed on the outer periphery of the wedge ring 4 in a freely retractable manner. , the tightening positions of the wedge ring 4 and the fixed ring 3 can be kept constant, and the connection work can be performed rationally.

Moreover, the joint main body 2 can be connected even when the connecting ends of the connecting pipe P are made of different materials or have different diameters, or even when the connecting ends are inclined.

FIG. 1 is a partially cutaway side view showing one embodiment of the present invention. It is a side view similarly showing a mounting state. It is an exploded perspective view showing one form similarly. It is a perspective view showing the fixed state of the body band similarly. It is a side view showing the fixed state of the main body band similarly. It is a side view showing the state before fixation of the body band similarly. (A) and (B) are sectional views showing a connected state of the same diameter. (A) and (B) are sectional views similarly showing a connected state of different diameters. (A) and (B) are cross-sectional views showing a bent connection state with the same diameter. (A) and (B) are cross-sectional views showing similarly bent and connected states of different diameters.

EMBODIMENT OF THE INVENTION Hereinafter, one form for implementing this invention is demonstrated with reference to drawings. Reference numeral 1 shown in the figure is a cylindrical cover body 1 that is attached to the outer periphery of the connecting end of the connecting pipe P. A joint body 2 is fixed to the end of the cover body 1, and a packing 6 is disposed inside the joint body 2 (see FIG. 2).

The cover body 1 has a locking flange 1A projecting from the opposite side of the connection end (see FIG. 3). Furthermore, it is provided with a main body band 5 that is locked to this locking flange 1A (see FIG. 4). The illustrated cover main body 1 has the cover main body 1 attached to protruding parts such as a connecting body 3A protruding from a fixing ring 3, which will be described later, and wedge bodies 4A and 5A protruding from a wedge ring 4 and a main body band 5, respectively. A stepped notch 1B is formed in the longitudinal direction from the locking flange 1A side so as not to touch the locking flange 1A (see FIG. 3). Further, a constricted portion 1C is formed in the longitudinal center of the cover body 1 so that the connecting pipe P inserted into the cover body 1 can be fixed at the center of the cover body 1.

The joint main body 2 shown in FIGS. 1 to 6 is an annular connecting member having a fixed joint part 2A and an extension joint part 2B. The fixed joint part 2A and the extension joint part 2B fit into the inside of the cover main body 1 (see FIG. 2).

The fixed joint part 2A is fixed to the cover main body 1 end of one of the connecting pipes P to be connected, and the extension joint part 2B is fixed to the cover main body 1 end of the other connecting pipe P. The pair of cover bodies 1, the joint bodies 2 fixed to each other at the ends of the cover bodies 1, and the packing 6 connect the connecting pipes P to each other (see FIG. 1). For fixing the cover body 1 and the joint body 2, any fixing means may be used, such as caulking means for crimping a part of the cover body 1, fixing means using a fixing band, etc. that tightens around the connecting part. (not shown).

On the other hand, it is also possible to configure the end portion of the cover body 1 to fit inside the joint body 2 (see FIGS. 7 to 10). In this case, the packing 6 is arranged inside the cover body 1 (not shown).

The joint main body 2 shown in FIGS. 7(a) and 7(b) is for connecting connecting pipes P whose connecting ends have the same diameter. In this way, the cover main body 1 and the joint main body 2 are attached to the connecting end of the connecting pipe P, and the connection is made by crimping the packing 6 in the cover main body 1, so that the connection can be made regardless of the material of the connecting pipe P. That is, it is possible to connect both the same kind of material and different kinds of materials, for example, it is also possible to connect connecting pipes P made of a metal material and a resin material.

Furthermore, it is also possible to connect pipes with different diameters via the joint body 2 (see FIGS. 8(a) and 8(b)). In this case, connecting rings 2C with different diameters at the connecting ends of the joint body 2 are used.

Furthermore, by using the bend pipe 2D together with the joint body 2, connection is possible even when the connecting pipe P is inclined (see FIGS. 9A and 9B). The illustrated bend pipe 2D has a shape inclined at 15 degrees.

Furthermore, by combining the different diameter connecting ring 2C and the bend pipe 2D, different diameter pipes can be connected in an inclined state (see FIGS. 10A and 10B).

In this way, by connecting the joint parts in advance in the factory and delivering them, piping work can be carried out efficiently on site.

On the other hand, as a configuration for crimping the tip of the connecting pipe P to the packing 6 inside the cover body 1, a fixing ring 3 and a wedge ring 4 are attached to the connecting tube P, and a body band 5 is attached to the cover body 1 (see Fig. 1). ).

The fixing ring 3 is fixed to the outer periphery of the connecting pipe P by screwing a connecting body 3A formed at one open end with a fixing screw 3B (see FIG. 3). At this time, the fixing force of the fixing ring 3 is increased by providing a non-slip member 3C such as a rubber plate on the surface of the fixing ring 3 that contacts the connecting pipe P. In the illustrated example, one side of the fixing ring 3 is connected, but the fixing ring 3 is formed so that the upper and lower parts are separated, and a pair of connecting bodies 3A are formed in the left and right separated parts, and a pair of fixing screws are formed. It is also possible to fix it with 3B (not shown). Furthermore, dovetail joints 3a and 4a are provided protrudingly on the contact surface with a wedge ring 4, which will be described later, so that the fixed ring 3 and the wedge ring 4 are integrated (see FIG. 3).

The wedge ring 4 has an annular shape attached to the outer periphery of the connecting pipe P, and has a configuration in which a pair of left and right wedge bodies 4A protrude from the fixed ring 3 (see FIG. 3). This wedge body 4A is partially protruding from the side surface of the wedge ring 4 and is inclined along the longitudinal direction of the connecting pipe P, forming a side mountain shape protruding toward the main body band 5 direction, which will be described later. Tapered surfaces 4Aa are formed on the top and bottom (see FIG. 5).

In the illustrated example, a plurality of positioning protrusions 4B protrude from the outer periphery of the end of the wedge ring 4 toward the main body band 5 (see FIG. 3). This alignment protrusion 4B has notches 4Ba formed on both sides, and is formed so that when the main body band 5 is tightened, the protruding alignment protrusion 4B gradually narrows inward. Then, before tightening the main body band 5, this positioning protrusion 4B is locked to the open end of the cover main body 1 on the locking flange 1A side (see FIG. 6). By doing so, the wedge ring 4 and the fixing ring 3 integrated with the wedge ring 4 are installed on the locking flange 1A side of the cover body 1, so that the tightening positions thereof can be kept constant. Moreover, after the main body band 5 is tightened, the narrowed positioning projection 4B is retracted into the inside of the cover main body 1, so that the movement of the connecting pipe P is not obstructed (see FIG. 4).

The main body band 5 includes a pair of wedge bodies 5A protruding from each other that match the positions of the wedge bodies 4A of the fixing ring 3, and a pair of band-like bodies 5B that divide the wedge bodies 5A into upper and lower parts. It is. Then, the separated wedge bodies 5A are connected with a connecting screw 5C (see FIG. 3). This wedge pressing body 5A is formed with a tapered surface 5Aa which overlaps and presses against the tapered surface 4Aa formed on the wedge body 4A of the wedge ring 4 (see FIG. 5).

Then, when the tapered surfaces 4Aa and 5Aa of the wedge body 4A and the wedge body 5A are overlapped and the main body band 5 is tightened, the wedge body 4A of the wedge ring 4 is pressed in the direction of the connection end via the wedge body 5A of the main body band 5. Then, the connecting end of the connecting pipe P fixed by the fixing ring 3 is crimped onto the packing 6 (see FIG. 5).

That is, as the wedge pressing body 5A of the band-shaped body 5B is tightened with the connecting screw 5C, the tapered surface 5Aa of the main body band 5 is gradually pressed against the tapered surface 4Aa of the wedge ring 4. Then, the wedge ring 4 moves toward the connecting end along the tapered surface 5Aa of the wedge body 5A, and the connecting end of the connecting pipe P is crimped and fixed to the packing 6 (see FIG. 5). As a result, the connecting ends of the connecting pipes P are connected to each other via the joint body 2 in a state where they are crimped to the packing 6.

It should be noted that the reference numerals added in each of the sections ``Means for Solving the Problems'' and ``Effects of the Invention'' are added to facilitate reference to the parts indicating each component described in the drawings. The present invention is not limited to the structure, shape, etc. shown by these descriptions or the symbols in the drawings.

P...Connecting pipe 1...Cover body 1A...Locking flange 1B...Notch part 2...Joint body 2A...Fixed joint part 2B...Extension joint part 2C...Different diameter connecting ring 2D...Bend pipe 3...Fixing ring 3A...Connection body 3B... Fixing screw 3C... Anti-slip 4... Wedge ring 4a... Dovetail joint 4A... Wedge body 4Aa... Tapered surface 4B... Positioning protrusion 4Ba... Notch 5... Main body band 5a... Dovetail joint 5A... Wedge pressing body 5Aa... Tapered surface 5B ...Band-shaped body 5C...Connection screw 6...Packing

Claims (6)

A cylindrical cover body attached to the outer periphery of the connecting end of the connecting pipe, an annular joint body fixed to the end of the cover body, and interposed between the connecting end of the connecting pipe and the joint body. What is claimed is: 1. A pipe joint structure comprising a packing, and configured to connect the connecting pipes by fixing the cover body to the outer surface of the connecting pipes with the connecting ends of the connecting pipes crimped to the packing. The joint main body is fixed to one end of the cover main body, a locking flange is provided protruding from the outer periphery of the other end of the cover main body, and a main body band that locks to the locking flange and the outer periphery of the connecting pipe are provided. Comprising a fixing ring for fixing, and a wedge ring attached to the outer periphery of the connecting pipe between the fixing ring and the main body band,
A wedge body is provided to protrude from a part of the side surface of the wedge ring and has a tapered surface in the shape of a lateral mountain that slopes along the longitudinal direction of the connecting tube; forming a wedge body having a pair of tapered surfaces that overlap from above and below on the tapered surface;
Claim 1, wherein when the tapered surfaces of the wedge bodies are overlapped and the body band is tightened, the connecting end of the connecting pipe is crimped to the packing via the wedge ring and the fixing ring. Pipe fitting structure described. In the main body band, a pair of vertically separated band-like bodies are connected by a pair of connecting screws that vertically pass through the pair of right and left wedge bodies, respectively, and the fixing ring is connected to the connecting body formed in the opening of the ring in the vertical direction. 3. The pipe joint structure according to claim 1, wherein the pipe joint structure is configured to be connected by a fixing screw penetrating through the pipe joint structure. The wedge ring is provided so as to be freely connectable to the fixing ring, and a positioning protrusion that is retractably formed on the outer periphery of the wedge ring and that locks on the opening end of the cover body on the locking flange side. Pipe joint structure according to item 1 or 2. 2. The pipe joint structure according to claim 1, wherein the joint main body is formed such that a connecting end portion connects the connecting pipes having the same diameter or different diameters. 4. The pipe joint structure according to claim 1, wherein the joint main body is formed to connect the connecting pipes each having an inclined connection end.

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