CH654894A5 - DEVICE FOR JOINING TWO RESIN DUCTS, AVOIDING THE EROSION OF THE RESIN INTERIOR BODIES THEREOF. - Google Patents

Description

The present invention relates to a device for assembling two resin pipes, making it possible to prevent erosion of the interior bodies of these pipes linked together end to end, the interior annular body being provided on the interior peripheral surface of the end of at least one of the pipes.

On such a device, the inner annular resin body is provided on the inner peripheral surface of the connecting end of at least one of the resin pipes to give rigidity to this end of the pipe and to protect this end. Furthermore, when such an interior resin body is provided on the two interior peripheral surfaces of the ends facing the two resin pipes connected end to end, this body not only gives rigidity to the opposing ends and protects the surfaces. peripherals of these ends, but it also tightly connects the two pipes together.

As described below in detail and with reference to the drawing, the interior resin bodies known hitherto are subjected to erosion at one or at their two ends, due to the action of the fluid in the pipe. In some cases, erosion can seriously damage the resin body, making it unable to perform its function.

The object of the present invention is to provide a device for assembling two resin pipes, linked together end to end, making it possible to prevent the erosion of their interior resin bodies.

To achieve this object, the device according to the invention is produced as described in claim 1.

The invention will be described below by way of example and with the aid of the drawing in which:

fig. 1 is a view in longitudinal section showing a known device;

fig. 2 is an enlarged view showing the inner resin body;

fig. 3a to 3d illustrate the states of erosion of the inner resin body;

fig. 4 is a view in longitudinal section showing a first embodiment of the device according to the invention;

fig. 5 is a view in longitudinal section showing a second embodiment;

fig. 6 is a view in longitudinal section showing a third embodiment;

fig. 7 is a view in longitudinal section showing a fourth embodiment;

fig. 8 is a view in longitudinal section showing a fifth embodiment.

According to fig. 1, a known resin pipe 101 with a sleeve 103 at one end is connected to a resin pipe 102 having a sleeve 104 by the insertion of this sleeve into the base 103. The resin pipes 101, 102 have fibers incorporated reinforcements, such as fabrics made by weaving in the form of a sheet of reinforcing fiber rovings, and reinforcing fiber mats prepared by forming a sheet of reinforcing fiber filaments using a bonding agent. An inner annular body 105 made of resin is provided on the inner peripheral surface of the sleeve 104 in order to firmly connect the pipes 101 and 102 to each other. In the following description, the reinforcing fiber fabrics and the reinforcing fiber mats are collectively referred to as reinforcing fiber sheets.

As shown in fig. 2. the 105 resin inner body is

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constituted by layers of resin in the form of lamellae each comprising a sheet of reinforcing fibers 106. As a result of this lamellar formation, the resin body 105 comprises at each end a thin edge 105a which tends to easily release the accelerator from hardening contained in the resin, so that it is difficult to fully harden it. Consequently, if the fluid to be transported is sea water for example, the thin part 105a (FIG. 3a) is attacked by this fluid, producing an initial erosion. When the resin body 105 is in an area of low flow velocity, erosion occurs only in the thin edge portion of the resin body 105a (Fig. 3a), but if it is located in an area at medium flow speed, erosion will develop in the interior of the resin 105 body as shown in fig. 3b. In an area with high flow velocity, a considerable part of the resin body 105 is eroded, as shown in fig. 3c. In addition, if the high-speed flow of the fluid is accompanied by cavitation, the resin body 105 is completely eroded (fig. 3d). Whatever the degree of erosion in the resin body 105, this effect can lead to a rupture of the seal between the two pipes 101, 102 or to a leak producing a serious problem in the fluid transport system.

The devices according to the invention do not present the problem indicated above, as described below in connection with FIGS. 4 to 8.

According to fig. 4, a resin pipe 1 comprising sheets of reinforcing fibers and provided with a sleeve 3 at one end is linked to a resin pipe 2 comprising sheets of reinforcing fibers and provided with a sleeve 4 at one end,

when the sleeve 4 is inserted into the sleeve 3. An annular housing 6 is formed in the inner peripheral surface of the sleeve 3 and in the inner peripheral surface of the sleeve 4. An inner annular body of resin 5 with sheets of reinforcing fibers is provided in the annular housing 6. The peripheral surface of the resin body 5 is completely or substantially flush with the interior peripheral surfaces of the two pipes 1 and 2.

With the device as provided above, the opposite ends of the interior resin body 5 which are entirely housed in the annular housing do not include any thinned edge portion and they are therefore not subjected to any direct action of the interior fluid, so that the inner resin body 5 does not give rise to any problem due to erosion.

Fig. 5 shows a device for preventing the erosion of the interior resin bodies of two resin pipes 10 and 11 comprising sheets of reinforcing fibers and linked to each other at 12, as indicated. An annular resin connection body 13 is provided on the inner peripheral surfaces of the opposing ends of the two pipes 10 and 11. An annular resin reinforcement body 14 partially covering the connection body 13 has an end 14a which is the end upstream of this body relative to the direction A of fluid flow, this body being placed in an annular housing 15 provided in the peripheral surface of one of the conduits 10. An outer annular resin body 16 is provided on the surfaces external peripherals of the ends in opposition of the two pipes 10, 11 to link the two pipes together with increased solidity. The reinforcing body 14 is formed by lamellar layers with sheets of reinforcing fibers. It is advantageous to apply a film to the inner peripheral surface of the resin reinforcement body 14, immediately after the lamellar formation, to prevent the release from the resin of the curing accelerator. The resin can then be cured quickly and effectively.

With the device thus formed, the upstream end 14a of the reinforcing body 14, which is more particularly subject to the action of the fluid, is located in the annular housing 15, so that the reinforcing body 14 and the connecting body 13 having their upstream ends protected do not give rise to any erosion problem in the low and medium speed zones of the pipe systems.

Fig. 6 shows a device which is similar to that of FIG. 5,

except that an annular resin reinforcement body 14 'completely covers a resin connection body 13, the opposite ends of the body 14' being located respectively in annular housings 15 and 17 formed in the inner peripheral surfaces of the resin pipes 10 11. This structure is advantageously used especially in areas with high flow speed of the pipes, independently of the direction of flow of the fluid.

Fig. 7 shows a device in which a main resin pipe 20 and an intermediate resin pipe 21 are connected to each other end to end as at 23, the intermediate pipe 21 being further connected end to end as at 24 to an associated resin pipe 22. The associated pipe 22 is connected to a valve pipe (not shown) to control the flow of the fluid to be transported. The main pipe 20, the intermediate pipe 21 and the associated pipe 22 comprise sheets of reinforcing fibers. A first annular resin connection body 25 is provided on the interior peripheral surfaces of the ends in opposition to the main pipe and the intermediate pipe 21. A second annular resin connection body 26 is provided on the interior peripheral surface of the other end of the intermediate pipe 21 and on the inner peripheral surface of one end of the associated pipe 22. An annular resin reinforcing body 27 entirely covers the first and second connecting bodies 25, 26, the body 27 having one end 27a located in an annular housing 28 provided in the inner peripheral surface of the associated pipe 22, and the other end 27b located in an annular housing 29 provided in the inner peripheral surface of the main pipe 20. The resin reinforcing body 27 is formed by lamellar layers of resin each comprising a sheet of reinforcing fibers and covering the surface inner side of the body with a film to achieve effective hardening. The innermost resin layer of the body 27 is an erosion resistant layer, to improve the reinforcement. A first outer annular resin body 30 is provided on the outer peripheral surfaces of the opposing ends of the main pipe 20 and the intermediate pipe 21. A second outer annular resin body 31 is provided on the outer peripheral surfaces of the opposing ends the intermediate pipe 21 and the associated pipe 22.

With the device thus formed, the reinforcement body 27 has its opposite ends 27a, 27b located in the annular housings 28. 29, and it comprises the innermost layer resistant to erosion, so that it is reinforced in it. and even that the structure is advantageously used in a high-speed L zone with cavitation (over a certain distance downstream of the valve pipe) of the pipe transport system.

Fig. 8 shows only the right half of a device in which a resin pipe 40 having a flange 41 at one end is connected end to end to a not shown resin pipe (which may be a valve pipe) having a flange an extremity. The flange 41 comprises an annular sealing housing 42. An inner annular resin body 43 formed on the inner peripheral surface of the end of the pipe 40 extends over the lateral surface of the flange 4L The resin body 43 has a end 43a located in an annular housing 44 of the inner peripheral surface of the pipe 40 and the other end 43b located in the sealing housing 42 of the flange 41. The resin pipe 40 comprises sheets of reinforcing fibers 45 and a innermost layer 46 resistant to erosion.

With the joint device thus formed, the inner resin body 43 has one end 43a located in the annular housing 44 of the inner peripheral surface of the pipe 40, and the other end 43b located in an outer part which is not subjected to the action of the internal fluid, so that the resin body 43 is not eroded by this fluid. In addition, the resin body 43, covering the lateral face of the end of the pipe 40, eliminates the probability that the innermost layer resistant to erosion 46 becomes detached or erodes by the action of the fluid.

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2 sheets of drawings

Claims (10)

654,894 2 1. Device for assembling two resin pipes, making it possible to avoid erosion of the internal bodies of these pipes linked together end to end. ! e inner body, annular, being provided on the inner peripheral surface of the end of at least one of the pipes, characterized in that the inner body (15, 13, 14, 27, 43) has at least one end located in an annular housing (6, 15, 17, 28, 29, 42, 44) formed in the inner peripheral surface of at least one of the pipes. 2. Device according to claim 1. characterized in that a resin pipe (I) before a socket (3) at one end is linked to a resin pipe (2) having a sleeve (4) at one end, the sleeve (4) being housed in the socket (3). and in that the inner annular resin body (5) is provided on the inner surface of the sleeve (3) and on the inner surface of the sleeve (4). 3. Device according to claim 2. characterized in that the annular housing (6) is formed in the inner surface of the sleeve (3) and dan; - the inner surface of the sleeve (4), and in that the inner body resin (5) is fitted into the annular housing (6). 4. Device according to claim 1, characterized in that the ends of the two pipes (10, 11) are in opposition, and in that the annular resin body (13, 14) is provided on the interior surfaces of the ends in opposition of the two pipes (10, 11). 5. Device according to claim 4, characterized in that an outer resin body (16) is provided on the outer surfaces of the ends in opposition of the two pipes (10, 11), to reinforce the joint between the two pipes. 6. Device according to claim 4, characterized in that the interior resin body comprises an annular resin connection body (13) provided on the interior surfaces of the ends of the two conduits (10, 11), and an annular reinforcement body made of resin (14) partially covering the connecting body (13) and having one end located in the annular housing (15), formed in the interior surface of one of the conduits (10). 7. Device according to claim 4, characterized in that the interior resin body comprises an annular resin connection body (13) provided on the interior surfaces of the ends of the two pipes (10, 11) for connecting these pipes together, and an annular resin reinforcing body (14 ') completely covering the connecting body (13), the ends of the reinforcing body (14') being located in annular housings (15, 17) formed in the inner surfaces of the ends of the two pipes (10, 11). 8. Device according to claim 1, characterized in that a first resin pipe (20) and a second (21) are in opposition to each other at one of their ends, and that a third (22) is in opposition to one of its ends with the other end of the second pipe, the inner annular resin body (27) being provided on the inside surface of said end of the first pipe (20) and extending over the inside surface of the second pipe and on the inner surface of the third pipe. 9. Device according to claim 8, characterized in that the interior resin body comprises a first annular resin connection body (25) provided on the interior surface of the first pipe (20) and on the interior surface of the second pipe (21) to bond them, a second annular resin connection body (26) provided on the inner surface of the second conduit (21) and on the interior surface of the third conduit (22) to bond them, and an annular resin reinforcing body (27) completely covering the two connecting bodies (25, 26), the ends of said annular reinforcing body (27) being located in annular housings (28, 29) formed respectively in the surfaces interior of the first and third conduits (20, 22). 10. Device according to claim 1, characterized in that the two resin pipes (40) have a flange (41) at one of their ends and are arranged with their flanges in opposition to each other, an annular sealing housing (42) being formed in each of the surfaces of the flanges (41), at least one of the resin pipes being provided with an inner annular body (43) extending from the inside surface of said end of the pipe to the flange (41) of the pipe, one end of the inner resin body being located in an annular housing (44) formed in the interior surface of the pipe, and the other end being located in the sealing housing (42) of the flange (41).