OA17411A - Tubular junction. - Google Patents

Abstract

This tubular junction comprises an interlocking end (6) connected to a barrel (8), and a plain end (4) which can be inserted into the interlocking end (6) and comprising a running portion. The interlocking end (6) comprises a base body (10) provided with an interlocking groove (12), a bottom groove (20) and a socket bottom (22). The interlocking end (6) comprises a protection member (26) disposed on the interlocking bottom (22) and protecting the interlocking bottom from contact with the plain end (4). The protection member (26) comprises a bottom axial stop (27A) and a skirt (27B). The skirt and the plain end are adapted to allow an angular deviation of the plain end (4) relative to the interlocking end (6) which is at least 2 ° when the plain end is in partial contact with the bottom axial stop (21 A).

Description

The present invention relates to a tubular junction according to the preamble of claim 1.

Tubular junctions comprising an interlocking end and an associated plain end are known in the prior art. When the plain end is inserted into the interlocking end, the end of the plain end may hit the interlocking bottom and damage the end. This is particularly problematic in the case where the interlocking end and the plain end are provided internally and externally with coatings, since the coatings can be damaged at the location of the contact areas, where the plain end hits the butt. interlocking bottom, thus promoting the initiation of corrosion.

To avoid this contact of the plain end as much as possible at the interlocking bottom, it is recommended not to insert the plain end fully into the interlocking end and thus to leave an axial gap between the plain end and the interlocking base. . This gap, however, promotes the appearance of stagnant water between the plain end and the interlocking end, eventually leading to the deposit and accumulation of dirt in the gap between the end of the plain end and the interlocking bottom. These stagnant water and / or deposits of dirt then generate disturbances in the water course which impede the proper flow of the transported water.

The aim of the invention is to remedy these drawbacks and to provide an interlocking end for a tubular junction which has an increased service life.

To this end, the invention relates to a tubular junction according to the characterizing part of claim 1.

According to particular embodiments of the invention, the tubular junction may have one or more of the features of the dependent claims.

According to particular embodiments of the invention, the interlocking end may also optionally include one or more of the following characteristics:

- the protective member is a protective ring;

- the protection member has a non-circular radial cross section, and in particular a hollow frustoconical shape;

- the base body has a bottom groove and the protective member is placed in the bottom groove;

- the protective member is made of a material having a Shore A hardness of between 40 and 80; 4 ^

- the protective member is made of an elastomer material, in particular an EPDM copolymer, an NBR copolymer, an SBR copolymer, chlorosulfonated polyethylene (CSM), a natural rubber or a thermoplastic elastomer, or a thermoplastic material, in particular PP, made of PE or amorphous PET;

- the base body includes an inlet flange and the interlocking bottom extends radially inward, and possibly outward, beyond the inlet flange;

- the base body comprises a core and a coating arranged at least on the interlocking bottom.

The invention will be better understood on reading the description which follows, given solely by way of example and made with reference to the accompanying drawings, in which:

- Figure 1 is a sectional view of a first embodiment of a tubular junction according to the invention, the plain end being in an intermediate position during the introduction of the plain end into the interlocking end;

- Figure 2 is a view similar to that of Figure 1, the plain end being in an end position relative to the interlocking end and in contact with the protection member;

- Figure 3 is a sectional view of a second embodiment of the tubular junction according to the invention, the tubular junction being in the aligned and nested configuration;

- Figure 4 is a sectional view of the second embodiment of the tubular junction according to the invention, the junction being in a deflected and nested configuration;

- Figure 5 is a sectional view of a third embodiment of the tubular junction according to the invention, which is a variant of the junction of Figures 3 and 4; and

- Figure 6 is a sectional view of a fourth embodiment of the tubular junction according to the invention, which is a variant of the junction of Figure 7.

In Figure 1 is shown a tubular junction according to the invention, designated by the general reference 2.

The tubular junction 2 comprises a plain end 4 of a first pipe and an interlocking end 6 of a second pipe. The plain end 4 extends along a central X-X axis and the interlocking end 6 extends along a central Y-Y axis. The tubular junction 2 has an aligned configuration in which the two central axes X-X and Y-Y coincide and form a central axis of the tubular junction. In what follows, the terms "radially" and "axially" used in the context of an object refer to the central axis of that object. The tubular junction 2 also has a deviated configuration, in which the two central axes X-X and Y-Y form a non-zero angle between them.

The plain end 4 includes a running portion 4A as well as a chamfered end 4B. The running portion 4A has a plain-ended outer surface 4C, which in this case is cylindrical with a circular section. The chamfered end 4B has a 4D frustoconical surface. The plain end 4 ends with a front face 4E, in this case annular.

The plain end 4 can be inserted into the interlocking end 6.

The interlocking end 6 is connected to a barrel 8 and forms therewith a pipe. The barrel 8 is substantially cylindrical and has an inside diameter PIF and an outside diameter DEF. Drum 8 also extends concentrically around the central Y-Y axis. The barrel 8 has an interior surface 8A.

The interlocking end 6 is provided with a base body 10. This base body 10 is integrally connected to the shaft 8.

The base body 10 includes a core 10A and a liner 10B disposed on the core. The core 10A is made of metal, for example cast iron. The coating 10B is for example an anti-corrosion coating, in particular based on zinc on the outer surface of the core 10A and based on epoxy or zinc on the inner surface and on the front surface of the core 10A. The barrel 8 comprises a core and a coating made of materials identical to the materials of the core 10A and the coating 10B, respectively.

The plain end 4 comprises a core made of a material identical to that of the core 10A and a coating disposed on this core. The coating of the plain end 4 is for example an anti-corrosion coating, in particular based on zinc on the outer surface of the core and based on epoxy, zinc or cement on the inner surface and on the front surface of the core. soul.

The base body 10 is provided with a fitting groove 12. The fitting end 6 comprises an inlet flange 14 defining an inlet opening 16 of the fitting end 6 into which the plain end 4 is inserted. inlet flange 14 has an inner inlet diameter DIE. Entry flange 14 has an entry front face 14A, which is the front face of the interlocking end. In what follows, the term "proximal" means facing towards the entry flange 14 and the term "distal" means facing away from this entry flange 14.

The interlocking end 6 also comprises an intermediate rib 18. The interlocking groove 12 is delimited axially by the entry flange 14 and the intermediate rib 18. its /

The tubular junction 2 also comprises a seal, not shown in Figures 1 and 2, which is arranged in the interlocking groove 12 and is applied against the plain end 4 and the interlocking end 6. In the occurrence, the seal is of the automatic type, that is to say that the seal is obtained automatically by radial compression of the seal between the plain end 4 and the interlocking end 6 when inserting the plain end , without using a clamp to compress the seal.

The interlocking end 6 also has a bottom groove 20 and an interlocking bottom 22. The bottom groove 20 has a maximum internal diameter DIG. The intermediate rib 18 separates the bottom groove 20 from the fitting groove 12. The fitting bottom 22 defines the bottom groove on the axial side of the barrel 8.

The socket bottom 22 extends radially inward beyond the inlet inner diameter DIE of the inlet flange 14 and to the inner diameter of the 8 PIF barrel. The interlocking bottom 22 also extends radially outward beyond the internal inlet diameter DIE and extends towards the bottom of the bottom groove 20. In this case, the interlocking bottom 22 is a frustoconical surface widening towards the inlet flange 14. The inclination of this frustoconical surface with respect to the central axis YY is for example between 30 ° and 70 °.

The interlocking end 6 further comprises a protection member 26 which is disposed on the interlocking bottom 22 and which protects this interlocking bottom 22 from contact with the plain end 4.

In this case, the protector 26 is a protector ring extending around the central Y-Y axis of the interlocking end 6. The protector 26 has a non-circular cross section. This cross section is taken in a radial plane with respect to the central Y-Y axis. In the present case, in the unsolicited state, the protective member 26 has a hollow frustoconical shape and is disposed on the interlocking bottom 22 as well as on the bottom of the bottom groove 20.

The protection member 26 comprises an axial bottom stop 27A, arranged on the nesting bottom 22, and a skirt 27B arranged on the bottom of the bottom groove 20. The skirt 27B has a proximal end 27C, a distal end 27D and an interior skirt surface 27E. The proximal end 27C is disposed on the side of the intermediate rib 18 and the distal end 27D is disposed on the side of the shaft 8 and is adjacent to the bottom axial stop 27A.

In the nested state of the plain end 4 in the interlocking end 6 and in the aligned configuration of FIG. 2, the front face 4E of the plain end is applied all around its periphery against the bottom axial stop 27A. In this aligned configuration, the running part 4A is completely out of contact with the protection member 26 and only the front face 4E and the chamfered end 4D are in contact with the bottom axial stop 27A of the protection member, the plain end 4 being completely out of contact with the skirt 27B.

The skirt 27B and the plain end 4 are adapted to allow an angular deviation of the plain end 4 relative to the interlocking end 6, when the plain end 4 is in contact with a part of the bottom axial stop 27A, which is of at least 2 °, preferably at least 3 ° and in particular at least 5 °. In this deflected configuration, the plain end 4 is partially in contact with the bottom axial stop 27A, and partially in contact or completely out of contact with the skirt 27B. In this state, the contact between the plain end 4 and the protection member 26 is therefore established on all or part of the periphery of the protection member 26.

In the aligned configuration of the tubular junction 2 and depending on the diameters of the pipes, the inner surface 27E of the skirt 27B and the outer surface 4C of the plain end are separated by a maximum radial distance LPA of between 0.8% and 3 , 5% of the maximum internal diameter DIG of the bottom groove 20. Depending on the diameters of the assembled pipes, this distance LPA is for example between 3mm and 20mm and preferably between 4.75mm and 19.85mm.

The skirt 27B has a thickness e, which is measured perpendicular to the surfaces of the skirt 27B. The thickness e decreases from an axial side facing the inlet flange 14 to an axial side facing the barrel 8.

The protective member 26 is pressed against the interlocking bottom 22 and against the bottom of the bottom groove 20, its outer diameter being at all points of contact greater than the inner diameter of the interlocking bottom 22 and the bottom of the bottom groove 20.

The protection member 26 is also applied with its end facing the barrel 8 on the inner surface 8A of the barrel 8 over an axial distance of about 3 mm. In order to ensure the continuity of the wire of liquid transported, the portion of the protective member which covers the inner surface of the barrel 8 has a thickness not exceeding 1 mm.

The protective member 26 is made of a plastic material, in particular an elastomeric material such as for example an EPDM (ethylene - propylene - diene) copolymer, an NBR (acrylonitrile - butadiene) copolymer, an SBR (styrene - butadiene) copolymer, chlorosulfonated polyethylene, a natural rubber or a thermoplastic elastomer (TPE), or a thermoplastic material such as, for example, PP (polypropylene), PE (polyethylene) or PET (polyethylene terephthalate) amorphous.

In the case where the protective member 26 is an elastomer, the latter has a Shore A hardness of between 40 and 80.

The tubular junction 2 according to the invention operates as follows:

During assembly, the plain end 4 is introduced into the interlocking end 6 by passing through the inlet flange 14 and the introduction is continued in the direction of the interlocking bottom 22.

When the plain end 4 arrives at the level of the interlocking bottom 22, it rests against the protection member 26 and remains out of contact with the base body 10 at least at the level of the protection member 26. This configuration is shown in figure 2.

In the assembled state, the plain end 4 axially compresses the protection member 26. More precisely, the plain end axially compresses the bottom axial stop 27A of the protection member. In this configuration, during the flow of liquid inside the tubular junction 2, the protective member 26 is deformed and fills the axial gap between the plain end 4 and the interlocking end 6, thus ensuring the respect for the liquid wire transported.

On the one hand, the interlocking end 6, comprising the protection member 26 according to the invention, prevents damage to the interlocking end 6 or of the plain end 4 when the plain end is inserted into the interlocking end 6 .

On the other hand, the protection member 26 ensures the respect of the liquid wire and prevents stagnant liquids in the axial gap between the plain end 4 and the interlocking end 6.

In Figures 3 and 4 is shown a tubular junction 2 according to a second embodiment of the invention. This tubular junction differs from the tubular junction of Figures 1 and 2 only by the following. Similar elements bear the same references.

The interlocking bottom 22 extends perpendicularly to the central Y-Y axis or is inclined at most 3 ° to the Y-Y axis. The groove bottom 20 is frustoconical and is adjacent to the interlocking bottom 22. The inclination of the groove bottom 20 relative to the central axis Y-Y is between 3 ° and 25 °.

The skirt 27B has a thickness e which is substantially constant over the entire axial extent of the skirt. The thickness e is also measured perpendicular to the surfaces of the skirt 27B.

In the aligned configuration visible in Figure 3 and depending on the diameters of the pipes, the maximum radial distance LPA is between 0.9x and 3x the thickness e of the skirt.

The bottom axial stop 27A is formed by a stop rib 50, adjacent to the skirt 27B and defining a stop surface 52 facing the entrance to the interlocking end. The stop rib 50 rests on the nesting bottom 22, in particular on the entire nesting bottom with a surface 54. The stopper rib 50 has an axial width BLA.

The stop surface 52 extends perpendicular to the central Y-Y axis or is inclined at most 3 ° relative to the central Y-Y axis.

The stop rib 50 defines a free interior surface 56. The free interior surface is cylindrical with a circular section. The free interior surface 56 has an interior diameter substantially identical to the interior diameter PIF of the barrel 8, and preferably also substantially identical to the interior diameter of the plain end 4. Thus, in the aligned configuration of FIG. 3, the tubular junction 2 forms a continuous interior surface of the same diameter extending from the plain end 4 to the shaft 8.

The interlocking end 6 defines an interlocking depth PE, which is the distance between the entry front face 14A of the interlocking end 6 and the entry of the barrel 8. The axial width BLA is advantageously between 4% and 15. % of nesting depth PE.

In the aligned configuration of Figure 3 and in the nested state of the tubular junction 2, the front face 4E of the plain end 4 is in contact with the abutment surface 52 and the plain end 4 is completely out of contact with the skirt 27B.

In Figure 4 is shown the tubular junction 2 of Figure 3 in a deflected and nested configuration.

In this configuration, the front face 4E is in contact with the bottom axial stop 27A on one side only. The plain end 4 is completely out of contact with the protective member 26 at all other locations of the protective member 26. However, in a maximum deflected configuration not shown, the plain end may also be partially in contact with the bottom axial stop 27A and partially in contact with the skirt 27B.

In the deflected configuration, the central Y-Y axis and the central X-X axis form an angle a between them. The angular deviation of the plain end 4 from the interlocking end 6 formed by this angle a is at least 2 °, preferably at least 3 ° and in particular at least 5 °.

In Figure 5 is shown a tubular junction 2 according to a third embodiment of the invention. This tubular junction differs from the tubular junction of

Figures 3 and 4 only by the following. Similar elements bear the same references.

The bottom groove 20 has a proximal axial portion 60 inclined by a first angle β relative to the central axis YY and a distal axial portion 62 inclined relative to the central axis YY, by a second angle γ which is greater than at the first angle β. Each of the proximal axial 60 and distal 62 portions is frustoconical.

Consequently, the protection member 26 has a bevelled outer surface, complementary to the shape of the bottom groove 20.

In Figure 6 is shown a tubular junction according to a fourth embodiment. This tubular junction 2 differs from the tubular junction of Figure 5 only by the following. Similar elements bear the same references.

The protection member 26 comprises a baffle 70 extending radially inside the interior surface 8A of the barrel 8. The baffle 70 is adapted to disturb the flow of the liquid circulating in the tubular junction in a direction of flow. EC. The stirring effect generated by the baffle 70 then makes it possible in certain cases, more particularly when the transported liquid is loaded with abrasive particles, to minimize the abrasion of the pipes, in particular on the low generator.

In this case, the baffle 70 comprises a first portion 72 adapted to disturb the flow of the transported liquid, and which extends the stop rib 50 radially inwards over the entire periphery of the stop rib. This first portion 72 has an axial width identical to the width B LA of the stop rib 50 and forms a baffle end face 74 which is inclined more than 75 ° with respect to the central axis YY. The front baffle surface 74 is directed towards the inlet of the interlocking end 6 and therefore upstream of the fluid flowing in the tubular junction 2.

The first portion 72 has an ERC radial thickness which is at least 2mm.

The baffle 70 further comprises a second portion 76 adapted to protect the portion of the barrel 8 located directly downstream of the baffle. This second portion 76 is linked to the first portion 72 and extends axially on the side opposite to the front surface 74. The second portion covers part of the interior surface 8A of the barrel 8. The second portion 76 has an axial width which is at least 1 time the axial width of the stop rib 50. The second portion 76 has a shape widening towards the side opposite to the front surface 74.

The features of one embodiment can be applied to the other embodiments.

The embodiment of Figures 1 and 2 is more particularly suitable for sanitation pipes carrying wastewater, while the embodiments of Figures 3 to 6 are more particularly suitable for pipes carrying!

abrasive fluids, for example water loaded with abrasive solid particles. uA

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EKEMEWAGHT If j

Claims (14)

1 Tubular joint, of the type comprising - an interlocking end (6) connected to a shaft (8), and - a plain end (4) insertable into the interlocking end (6) and comprising a running portion, the interlocking end (6) comprising a base body (10) provided with a fitting groove (12), d 'a bottom groove (20) and a nesting bottom (22), the interlocking end (6) further comprising a protection member (26) disposed on the interlocking bottom (22) and protecting the interlocking bottom of a contact with the plain end (4), characterized in that the protective member (26) comprises a bottom axial stop (27A) and a skirt (27B), and in that - the skirt and the plain end are adapted to allow an angular deviation of the plain end (4) relative to the interlocking end (6) which is at least 2 °, preferably at least 3 ° and in particular d 'at least 5 °, when the plain end is in partial contact with the bottom axial stop (27A). 2, - Tubular joint according to claim 1, wherein: - the plain end (4) comprises an outer surface of a plain end (4C), - the skirt (27B) comprises an inner surface of the skirt (27E), and - the maximum radial distance LPA between the inner surface of the skirt (27E) and the outer surface of the plain end, (4C) is between 0.8% and 3.5% of the maximum internal diameter DIG of the bottom groove (20 ) when the plain end and the interlocking end are aligned. 3, - Tubular joint according to claim 2, wherein the maximum radial distance LPA is between 3mm and 20mm, preferably between 4.75mm and 19.85mm. 4, - Tubular junction according to any one of claims 1 to 3, wherein the skirt (27B) has a thickness e, and in which the maximum radial distance LPA is between 0.9x and 3x the thickness e. 5. Tubular joint according to any one of claims 1 to 4, characterized in that the protective member (26) is a protective ring. 6, - Tubular joint according to any one of claims 1 to 5, characterized in that the protective member (26) is applied with its end facing the barrel (8) on an inner surface (8A) of the barrel over an axial distance of 3mm, and in particular in that the portion of the protective member which covers the inner surface of the barrel has a thickness not exceeding 1mm. 7. - Tubular junction according to any one of the preceding claims, wherein the bottom axial stop (27A) is formed by a stop rib (50), adjacent to the skirt (27B) and defining a stop surface (52 ) for the plain end, the stop rib having an axial width BLA. 8. - Tubular joint according to claim 7, wherein the interlocking end defines an interlocking depth PE, which is the axial distance between a front face (14A) of the interlocking end and the entry of the barrel (8), and wherein the ratio of axial width BLA to nesting depth (PE) is between 0.04 and 0.15. 9. - A tubular joint according to claim 7 or 8, wherein the protective member (26) comprises a baffle (70) extending radially inside an interior surface of the barrel (8). 10. - Tubular joint according to claim 9, wherein the baffle (70) comprises a first portion (72) which extends the stop rib (50) radially inwardly and extends over the entire periphery of the rib of abutment, the first portion (72) forming a front baffle surface (74) which is inclined by more than 75 ° with respect to the central axis of the interlocking end, and which in particular is perpendicular to the central axis (YY ) of the interlocking end. 11. - A tubular joint according to claim 9 or 10, wherein the baffle comprises a second portion (76) extending axially opposite the front baffle surface (74) and on the inner surface of the barrel. 12. - Tubular joint according to any one of the preceding claims, wherein the protective member (26) is made of a material having a Shore A hardness of between 40 and 80 and / or the protective member (26) is in an elastomeric material, in particular an EPDM copolymer, an NBR copolymer, an SBR copolymer, chlorosulfonated polyethylene, a natural rubber or a thermoplastic elastomer, or in a thermoplastic material, in particular in PP, PE or amorphous PET. 13. - Tubular joint according to any one of the preceding claims, characterized in that the base body comprises an inlet flange (14) and the fitting bottom (22) extends radially inward, and possibly outwards, beyond the inlet flange (14). 14. - Tubular joint according to any one of the preceding claims, characterized in that the base body (10) comprises a core (10A) and a coating (10B) disposed at least on the interlocking bottom (22).