JPH01320392A - Connection structure for lining pipe - Google Patents

Abstract

PURPOSE:To co-axially connect a pair of mutual lining pipes at all times by providing the sleeve made of a resin whose one end part is combined into the end part at connection side of one part of lining pipes and to whose other end part the end part of the connection side of the other part of the lining pipe is outer-fitted. CONSTITUTION:A pair of lining pipes 1, 2 are provided with flanges 12, 22 at the end part of the connection side of a tubular body 11 and lining materials 13, 23 are coated on the inner peripheral faces of these tubular bodies 11, 21 and on the end face of the connection side of the flanges 12, 22. The sleeve 6 made of a resin whose one end part is fitted into the end part of the connection side of the one part of the lining pipe 1 and to whose the other end part the end part of the connection side of the other part of the lining pipe 2 is outer-fitted to the other end part, the packing 7 interposed between flanges of both lining pipes and the clamp type annular joint 5 engaged with the outer peripheral part of the flange 12, 22 are equipped with.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention provides a method for connecting lined tubes whose inner circumferential surfaces are coated with a lining material such as fluororesin, or between such lined tubes and their inner circumferential surfaces. The present invention relates to a connection structure for a lining pipe used when connecting a tank covered with a lining material such as a fluororesin.

(Conventional technology) Piping that connects tanks that store high-purity drugs,
BACKGROUND ART Recently, in piping for extracting chemicals from tanks, the inner circumferential surface of the pipe has been coated with a lining material that has excellent chemical resistance and corrosion resistance.

Conventionally, when connecting such lining pipes to each other or to connecting a lining pipe protruding from the side wall of a tank to another lining pipe in a liquid-tight manner, for example, an actual MSS-T2SO method has been used.
The configuration disclosed in the G2 publication is adopted. In the lining pipe connection structure disclosed in this publication, the connection side ends of a pair of lining pipes are butted against each other, and the flanges provided at the connection side ends of each lining pipe are opposed to each other via a packing. Then, by inserting a bolt between both flanges and tightening them with a nut, both flanges are brought close to each other, and both flanges are brought into pressure contact with each other via a packing.

In such a configuration, it is necessary to form a through hole in each flange for the bolt to pass through, insert the bolt into the through hole, and screw a nut onto the bolt, so the disadvantage is that it takes time and effort to connect the lining pipe. There is.

In order to eliminate such drawbacks, for example,
As disclosed in Japanese Unexamined Patent Publication No. 87285 and Japanese Utility Model Application Publication No. 62-87286, a connecting structure of a lining pipe using a ramp type joint has been proposed, which is relatively easy to attach and detach. An example of this clamp type joint is shown in FIG.

In the figure, 30 is an annular clamp-type joint in which a fitting groove 31 having a V-shaped cross section is formed on the inner peripheral surface, and 32a and 32b are a pair of lining pipes to be connected. Clamp type joint 30
The opposing inner surfaces have tapered surfaces 34 and 34 that approach each other toward the outer periphery.

Flanges 33a and 33b are provided at the connecting end of each lining pipe 32a and 32b. The outer surfaces of the opposite end surfaces of the flanges 33a and 33b are tapered surfaces 35a and 35b such that when the end surfaces of the flanges 33a and 33b are abutted against each other, they approach each other toward the outer periphery. It has become.

When connecting both lining pipes 32a and 32b, both flanges 33a of lining pipes 32a and 32b
and 33b are butted together with a gasket 36 interposed between them, and both flanges 33a, 33b
The clamp-type joint 30 is disposed around the outside of the flange 33, and the outer peripheral side portions of the flanges 33a and 33b are fitted into the fitting groove 31. Then, in this state, the clamp type joint 30 is tightened to reduce its diameter (by doing so, both flanges 33a,
Slidingly move the tapered surfaces 35a and 35b of 33b,
Both flanges 33a and 33b are brought into pressure contact via a packing 36.

(Problem to be Solved by the Invention) According to the above configuration, the clamp type joint 30 connects the lining pipe 3
2a and 32b, the flange 33a of one lining pipe 32a is deeply inserted into the fitting groove 31 of the clamp type joint 30 relative to the flange 33b of the other lining pipe 32b, as shown in FIG. There are things to do.

In such a state, each lining pipe 32a and 32b will not be concentric, and when the clamp type joint 30 is further tightened, the deeply inserted flange 33a and the flange 33b of the other lining pipe 32b will not fit in the same amount. It makes a big difference. As a result, both lining pipes 32a, 32b
are connected with a large eccentricity.

If this happens, there is a possibility that the position of the puncture ring 36 disposed between the flanges 33a and 33b may shift and not be placed at a predetermined position between the flanges 33a and 33b. In particular, when the lining pipes 32a and 32b are connected in an inclined state or when they are connected in a state in which they are arranged horizontally, the gaskets 36 are not held in both the lining pipes 32a and 32b, so they must be arranged in advance. There is a risk that it may shift from the place where it was placed due to its own weight.

As a result, the sealing performance at the connection between both lining pipes 32a and 32b becomes insufficient, and the lining pipes 32a and 32b
The liquid flowing inside may leak. Moreover, a part of the gasket 36 may protrude greatly into the lining tubes 32a, 32b, and the gasket 36 may become a flow resistance for the liquid.

On the other hand, as shown in FIG. 10, for example, a lining pipe 3
A ring-shaped groove 38 is formed so that the axis of 2a is the center, and a packing 36 having a protrusion 39 that fits into the groove 38 is arranged between both flanges 33a and 33b. A method of fitting the protrusion 39 into the ring groove 38 has also been proposed. However, such a configuration has the disadvantage that it is difficult to process the ring-shaped groove 38 because the lining material 37a is thin. Moreover, if the groove 38 is shallow, both lining pipes 32a, 32 may be tightened with the clamp-type joint 30 as described above.
When b is relatively eccentric, the protrusion 39 of the packing 36 comes off from the ring-shaped groove 38, and as described above, the packing 36
may not be placed in the designated position.

The present invention solves the above-mentioned conventional problems, and its purpose is to always connect a lining pipe connected to a tank to another lining pipe or a pair of lining pipes without delay, and to To provide a connecting structure for lining pipes that allows the packing to be connected without shifting during connection. Furthermore, another object of the present invention is that there is no need to groove the lining material coated on the side end surface of the flange, and the packing can be reliably placed in a predetermined position. The object of the present invention is to provide a connection structure for lining pipes that can be tightly connected.

(Means for Solving the Problems) In the lining pipe connection structure of the present invention, a flange is provided at the connection side end of the pipe body, and the lining is provided on the inner circumferential surface of the pipe body and the connection side end face of the flange. A pair of lining pipes covered with a material, and a resin sleeve whose one end is fitted into the connection side end of one lining pipe and the connection side end of the other lining pipe is fitted into the other end. A packing is fitted onto the sleeve and interposed between the flanges of both lining pipes, and the packing is fitted onto the outer periphery of the flanges of both the lining pipes and is reduced in diameter, so that the packing is inserted between the flanges of both the lining pipes. and an annular clamp-type joint for pressing the flange, thereby achieving the above object.

Further, a threaded portion may be formed at one end of the sleeve, and a threaded groove to be screwed into the threaded portion may be formed on the inner circumferential surface of one connection side end of the lining pipe. Also,
A protrusion may be formed on the outer periphery of the sleeve to lock the packing concentrically with the sleeve. Furthermore, a flanged sleeve may be inserted into the connecting end of the tube, and the flanged sleeve may form a part of the lining material.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show a part of a lining pipe 1 that is connected to the wall of a tank 4 and protrudes to the side of the tank 4, and another lining pipe 2 is connected via a clamp-type joint 5. An exploded front view and a partially cut-away front view are shown.

As shown in FIGS. 1 to 3, the lining pipe 1 connected to the tank 4 is formed of a metal pipe such as stainless steel, and the lining pipe 1 has a flange 12 integrally provided at the end thereof. A lining material 13 made of fluororesin or the like covers the inner circumferential surface of the tube 11 and the abutting side end surface of the flange 12. The abutting side end surface of the flange 12 covered with the lining material 13 is formed into a flat surface perpendicular to the longitudinal direction of the tube body 11. The surface of the flange 12 opposite to this surface is a tapered surface 12a that is inclined so that the thickness of the flange 12 becomes thinner toward the outer circumference.
It becomes. A thread groove 13a is formed on the inner circumferential surface of the brazing material 13 at the end of the lining pipe 1 connected to the other lining pipe 2.

In the figure, reference numeral 14 denotes a flange provided on the other end side of the lining pipe 1, and this flange 14 is fixed to the tank 4 with bolts.

The other lining pipe 2 connected to the lining pipe 1
The lining pipe 1 also has substantially the same configuration as the lining pipe 1 described above. That is, the lining pipe 2 covers the pipe body 21 provided with the flange 22 at the end on the connection side to the other lining pipe l, the inner peripheral surface of the wire pipe body 21, and the connection side end surface of the flange 22. It has a lining material 23 made of fluororesin or the like.

This lining material 23 is formed of a fluororesin hose 23a provided on the inner peripheral surface of the tube body 21 and a flanged sleeve 23b.
is inserted into the end of the lining pipe 2 and integrated with the end of the hose 23a by fusing. Further, the lining material 23 may be formed by lining the inner surface of the tube body 21 and the end surface of the flange 22 with fluororesin or the like. The tubular body 21 may be formed of a steel pipe, or may be formed of a flexible hose as shown in FIG.

The end surface of the flange 22 of the lining pipe 2 covered with the lining material 23 is formed into a flat surface perpendicular to the longitudinal direction of the tube body 2, and the surface of the flange 22 opposite to this surface is formed as the outer circumference increases. The flange 22 has a tapered surface 22a that is inclined so that the thickness thereof is reduced.

One end of the sleeve 6 is fitted into the end of one lining pipe 1 on the side connected to the other lining pipe 2 . The sleeve 6 is formed into a cylindrical shape from a resin having excellent chemical resistance, such as fluororesin. This sleeve 6 is fitted inside one of the lining pipes l, and preferably has a threaded portion 61 on its outer peripheral surface.
It has a small-diameter cylindrical portion 61 having a diameter a formed therein, and a large-diameter cylindrical portion 62 that has a larger diameter than the small-diameter cylindrical portion 61 and is fitted inside the other lining pipe 2 . The threaded portion 61a of the small-diameter cylindrical portion 61 is screwed into a threaded groove 13a carved on the inner circumferential surface of the lining pipe 1 into which the small-diameter cylindrical portion 61 is fitted. The small-diameter cylindrical portion 61 and the large-diameter cylindrical portion 62 have substantially equal longitudinal dimensions, and the sleeve 6
A protrusion 63 is formed at the end face portion of the large diameter cylindrical portion 62 at the connecting portion between the small diameter cylindrical portion 61 and the large diameter cylindrical portion 62, which is approximately at the center in the longitudinal direction.
is formed.

The clamp-type joint 5 that connects the lining pipes 1 and 2
As shown in FIGS. 4 and 5, it has a pair of clamp members 5a and 5b curved into a substantially U-shape, and the clamp members 5a and 5b form an annular shape.
Each end is butted. One of the abutted ends are rotatably connected to each other, and the other ends are connected to each other by a connecting pin 51. The connecting bottle 51 has a proximal end attached to one clamp member 5b, a threaded part 51a formed at the distal end, and a handle 52 screwed into the threaded part 51a attached to the other clamp member 5a. It is located in Then, by tightening or loosening the handle 52, the clamp member 5
The diameters of a and 5b can be made smaller or larger. As shown in FIG. 6, both the clamp members 5
A fitting groove 50 having a cross-sectional shape of a square shape and having tapered surfaces 50b and 50b that are inclined so as to approach each other toward the bottom is formed on the opposing inner circumferential surfaces of the fitting grooves a and 5b over almost the entire length. ing.

In order to connect the pair of lining pipes 1.2, as shown in FIG. The threaded portion 61a of 61 is screwed into the threaded groove 13a of the one lining pipe 1. The packing 7 is held between the protrusion 63 and the end face of the flange 12, and the position of the packing 7 relative to the flange 12 is fixed. Next, the lining pipe 2 on the other side is fitted onto the large diameter cylindrical portion 62 of the sleeve 6, and the flange 2
2 is brought into contact with the packing 7. Next, as shown in FIGS. 2 and 6, the diameters of both annular clamp members 5a and 5b of the clamp-type joint 5 are increased, and both flanges 12 are inserted into the fitting groove 50 of the clamp-type joint 5.
．． Insert the outer periphery of No.22. In this state, by turning the handle 52 of the clamp type joint 5, the clamp type joint 5
Both flanges 12.2 are inserted into the fitting groove 50 by reducing the diameter of the flanges 12.
Insert the outer periphery of No. 2 deeply. As a result, the tapered surfaces 12a and 122a of each flange 12.22 come into sliding contact with the tapered surfaces 50a and 50b formed on the inner surface of the fitting groove 50, and both flanges 12.22 come close to each other. As a result, the lining pipes 1 and 2 are connected with the flanges 12 and 22 in pressure contact with the packing 7.

In the connection structure of the lining pipe 1.2 having such a configuration, the packing 7 is fitted onto the sleeve 6, and the packing 7 is held between the protrusion 63 of the sleeve 6 and the end surface of the flange 12. The installation position of 7 is lining pipe 1.
The lining tubes 1 and 2 are arranged in a circular manner with respect to each lining pipe 1 and 2 without being displaced from each other. Moreover, since the pair of lining pipes l and 2 are connected via the cylindrical sleeve 6, sometimes when the clamp type joint 5 is tightened, only the flange 12 or 22 of one lining pipe 1 or 2 is connected to the flange 22 or 2 of the other lining pipe 1 or 2. 12, it is not inserted deeply into the fitting groove 50 of the clamp type joint 5, and is always connected concentrically.

FIG. 7 shows another embodiment of the invention. In this example,
The sleeve 6 is a threaded cylinder part 6 that is fitted into one of the lining pipes 1 and has a threaded part 61a formed on its outer periphery to be screwed into a threaded groove 13a carved on the inner peripheral surface of the lining pipe 1.
4, a cylindrical portion 65 that is fitted into the other lining pipe 2 and has approximately the same outer diameter and inner diameter as the threaded cylindrical portion 64; It has a protrusion 63 that protrudes from the top. Further, a notch 7a is provided in the inner peripheral portion of the packing 7, and a protrusion 63 is disposed within the notch 7a. Since the other configurations are the same as those of the previous embodiment, the same members are given the same reference numerals and the description thereof will be omitted.

In addition to the above-mentioned effects, this embodiment has the advantage that lining pipes 1.2 of the same diameter can be connected.

Further, in the above embodiment, the threaded portion 61a is provided at the end of the sleeve 6.
The sleeve 6 was fitted to the lining pipe 1 by forming the threaded portion 61a into the thread groove 13a formed in one of the lining pipes l. However, as shown in FIG. 6 is a cylindrical body having a constant outer diameter and inner diameter, and has a protrusion 63 protruding outward at the longitudinal center of the body. 7 and 7, respectively, and each side of the sleeve 6 may be fitted inside the lining pipes 1- and 2, respectively. In this state, when both lining pipes 1 and 2 are connected using the clamp type joint 5, the protrusion 63 of the sleeve 6 is sandwiched between the flanges 12 and 22. In this case, tapers 67 and 68 may be formed on the inner peripheral surface of the end portion of the sleeve 6 in order to reduce the resistance received from the fluid flowing inside the lining tube 1.2.

(Effects of the Invention) As described above, the present invention provides a resin-made pipe having one end fitted into the connecting end of one lining pipe and the connecting end of the other lining pipe externally fitted into the other end. A sleeve, a packing fitted externally to the sleeve and interposed between the flanges of both the lining pipes, and fitting to the outer circumferential portions of the flanges of both the lining pipes and being reduced in diameter through the packing. Since it is equipped with an annular clamp-type joint that brings both flanges into pressure contact, both lining pipes can be easily connected or separated by tightening or loosening the clamp-type joint. Moreover, since both lining pipes are connected through the sleeve, they are always connected concentrically.

Furthermore, since both lining pipes are connected with the gasket being fitted and held in the sleeve fitted to one of the lining pipes, both lining pipes can be connected horizontally or diagonally. Even in such cases, the packing can be placed at a predetermined position between both flanges without fear of the packing being misaligned. Therefore, unlike conventional methods, there is no need to create grooves in the lining material on the flange side.
By using a sleeve with a relatively simple structure, it is possible to reliably prevent liquid leakage at the connecting portion between both lining pipes. Further, the packing does not protrude too much from the inner circumferential surface of the lining pipe, thereby preventing fluid flow resistance.

4. 10 Fig. 1 is a partially cutaway exploded front view of one embodiment of the present invention, Fig. 2 is a partially cutaway exploded front view of one embodiment of the present invention;
The figure is a partially cutaway front view of the same as the above, Figure 3 is an exploded enlarged sectional view of the same as the above, Figure 4 is a perspective view of the clamp type joint as the above, Figure 5 is a front view of the clamp type joint as the above, and Figure 6 is the front view of the same as the above. FIG. 7 is an enlarged sectional view of the main part of the same as the above, FIG. 7 is a sectional view of the main part of another embodiment of the same, FIG. 8 is a sectional view of the main part of still another embodiment of the same, and FIG. 9 is a conventional lining pipe FIG. 10 is a sectional view of a main part of another conventional lining pipe connection structure.

1... Lining pipe, 2... Lining pipe, 5...
・Clamp type joint, 6... Sleeve, 7... Packing, 9... Thread groove, 11... Pipe body, 12... Flange, 13... Lining material, 21... Pipe body , 22
...Flange, 23...Lining material, 23b...
・Sleeve with flange, 61a...Threaded part, 63・
・Protrusion.

that's all

Claims (1)

[Scope of Claims] 1. A pair of lining tubes, each of which is provided with a flange at the connecting end of the tube and whose inner peripheral surface and the connecting end surface of the flange are coated with a lining material; A sleeve made of resin, one end of which is fitted into the connection side end of one lining pipe, and the other end of which the connection side end of the other lining pipe is externally fitted; a packing interposed between the flanges of the pipe; an annular clamp-type joint that fits onto the outer periphery of the flanges of both the lining pipes and is reduced in diameter to press the flanges together via the packing; A lining pipe connection structure comprising: 2. A threaded portion is formed at one end of the sleeve, and an inner circumferential surface of one connecting end of the lining pipe,
The lining pipe connection structure according to claim 1, wherein a threaded groove is formed in the threaded portion. 3. The lining pipe connection structure according to claim 1 or 2, wherein a protrusion that locks the packing concentrically with the sleeve is formed on the outer circumference of the sleeve. 4. A flanged sleeve is inserted into the connecting end of the pipe body, and the flanged sleeve forms a part of the lining material. Connection structure of lining pipe.