WO2002050467A1

WO2002050467A1 - Hollow cylindrical type of moulded piece for the permanent connection of hollow bodies

Info

Publication number: WO2002050467A1
Application number: PCT/EP2001/015160
Authority: WO
Inventors: Christian Müller
Original assignee: Uponor Innovation Ab
Priority date: 2000-12-21
Filing date: 2001-12-20
Publication date: 2002-06-27
Also published as: DE10063782C1

Abstract

The invention relates to a hollow cylindrical type of moulded piece (1), for the connection of hollow bodies (15), preferably hollow bodies made from polyolefins, comprising a shell (12), with an inner side (3), a free end (4) and a second free end (31), which is characterised in that sawtooth-type ribs (10) are arranged in longitudinal section around the circumference of the inner side of the moulded piece (1), at a separation (X) from each other. The ribs (10) are not equally formed in longitudinal section, whereby the side (6) of the ribs facing the free end (4) is shorter than the second side (7) facing away from the free end (4). The first side (6) forms an angle α of 1 to 90° with the inner side (3) of the moulded piece (1) and the second side (7) forms an angle β of 1 to 25° with the inner side (3).

Description

Hohl cylinderartiαes fitting for permanent connection of

Hohlstränαen

The invention relates to a hollow cylinder-like shaped piece for the permanent connection of hollow strands, preferably hollow strands made of polyolefins of the crosslinked and / or uncrosslinked type or the like, and a pipe coupling which has the hollow cylindrical shaped piece.

In the prior art, fittings for connecting hollow strands are known, on the inside of their jacket of the molding rib-like elevations are arranged in the circumferential direction of the jacket (manual of gas piping technology, 2nd edition, 1997, Oldenbourg-Verlag, see, for example, pages 193-195 ). It turns out, however, that although the hollow strands can also be inserted into these shaped pieces and are held stationary in the shaped piece for at least a certain period of time, the hollow strands held by the ribs prove to be due to e.g. forces occurring in the longitudinal direction, such as tensile forces, and displacements of the material surrounding the hollow strands, soil or the like, and the shrinkage forces due to the production of the hollow strands are not sufficiently connected. In addition, the conventional fittings tend to corrode on the inside due to the penetration of the media, such as gases, which are conveyed in the hollow strands.

The object of the present invention is to eliminate the disadvantages of this prior art. In addition, a shaped piece is to be provided which permanently ensures the fixed connection of the hollow strand inserted into the shaped piece with the same. In addition, the surface of the molded piece should not be attacked by the media conveyed in the hollow strands. Furthermore, it is desirable that The pipe coupling to be provided is sufficiently tolerant of the tensile forces and shear forces occurring in the longitudinal direction, insofar as sufficient wedging of the hollow strand and tightness in the fitting is desired.

The task is solved by the main claim and the secondary claim. The subclaims relate to preferred embodiments of the invention.

The invention relates to a hollow cylindrical fitting for connecting hollow strands, preferably hollow strands made of polyolefins of the crosslinked and / or uncrosslinked type, which has a jacket with an inside and a free end and another free end, which is characterized in that in longitudinal section the inside of the shaped piece is arranged at a distance X from one another and is arranged around circumferentially arranged ribs of the sawtooth-like type, the ribs in the longitudinal section are configured unevenly, the one side of the ribs facing the one free end being shorter than the other side facing away from the one free end, - The one side with the inside of the fitting includes an angle α of 1 to 90 °, the other side with the inside includes an angle β of 1 to 15 ° and in longitudinal section the distance XI of the first rib from the fitting end of one free end 15 to 29%, - the distance X2 of the second rib v on the fitting end of the one free end is 40 to 50%, and the distance X3 of the third rib from the fitting end of the one free end is 68 to 76% of the length of the fitting.

Another object of the invention is a pipe coupling with a fitting according to the invention, which is characterized in that the fitting has a hollow strand with polyolefins of the cross-linked and / or un networked type takes and the free end of the hollow strand with the one free end of the fitting flush and flush.

The hollow cylinder-like shaped piece according to the invention is preferably made of plastic-like materials and / or of metal, such as stainless steel, aluminum, and / or of ceramic materials or the like. The fitting is formed like a hollow cylinder. The wall of the fitting is designed with ribs on the inside. The fitting is preferably in one piece with the ribs. The ribs are arranged circumferentially in the form of rib rings and spaced apart from one another by a distance X. The rib rings can also be arranged regularly or irregularly interrupted on the inside of the molding according to the invention.

The distance X is also in the sense of the invention in longitudinal section that distance from the tip of the rib to the tip of the rib.

In the sense of the invention, the term rib tip in the longitudinal section also means the point of intersection at which one side and the other side of the rib of the molding according to the invention intersect.

The height H of a rib is also to be understood in the sense of the invention as the distance of the rib tip to the inside of the jacket of the molding according to the invention.

One side of the rib is also the one that faces the one free end of the molded part according to the invention.

The other side of the rib is the side that faces away from the one free end of the molded part according to the invention.

The hollow strand is inserted into the other free end of the molded part according to the invention facing away from one free end. Preferably one side with the inside of the jacket of the molded part according to the invention, seen in longitudinal section, includes an angle α of 1 to 90 °. Preferably, the angle α is 45 to 88 °, more preferably 87 °. The other side of the rib encloses an angle β of 1 to 45 °, preferably 2 to 10 °, even more preferably 3 °, with the inside of the jacket of the molding according to the invention.

The compression factor (ST) of the ribs is 0.86 to 1.05. The multiplication of the compression factor by the outer diameter (A _u ) of the hollow strand in the non-compressed state immediately after the manufacture of the hollow strand stands for the required outer diameter (A _G ) of the hollow strand when the hollow strand is used, for example inserted, into the pipe coupling according to the invention.

Outer diameter _un compressed (A _u) x upsetting factor (ST) =

Outside diameter _knurled (A _G )

An outer diameter (A _u ) of the hollow strand of 63 mm in the un-compressed state of the hollow strand when multiplying the compression factor (ST) by 0.86 results in a required outer diameter (A _G ) of the hollow strand of 54.18 mm, which is in the fitting the pipe coupling according to the invention can be coupled in a sufficiently stationary manner.

The compression factor takes into account the reduction in the dimensions of the hollow strand that occurs during the manufacture of the hollow strand. Preferably the compression factor is 0.8 to 1.05, more preferably 0.92 to 0.98.

The height H of a rib, preferably the third rib, is 5 to 8%, preferably 6%, of the value of (A _u ). The ratio of the foot F of the ribs to the thickness D of the jacket of the fitting is 0.5 to 5%. The ratio of the foot to the thickness D of the jacket is more preferably 2%.

In the context of the invention, foot F is also understood to mean the beginning of the bevel as a chamfer on the inside to the starting point of one side of the rib, viewed from the other free end parallel to the center-longitudinal axis A of the fitting.

The ribs preferably extend all the way around on the inside of the jacket of the molded part according to the invention. Three rib rings are preferably arranged on the inside of the jacket. The distance XI from the molding end of the one free end of the molding according to the invention to the first rib ring can be 15 to 29%, preferably 20%, of the length of the molding according to the invention (= 100%). The distance X2 from the molding end of the one free end of the molding according to the invention to the second rib ring can be 40 to 50%, preferably 50%, of the length of the molding according to the invention (= 100%). The distance X3 from the molding end of the one free end of the molding according to the invention to the third rib ring can be 68 to 76%, preferably 70%, of the length of the molding according to the invention (= 100%).

The inner radius is also understood to mean the distance between the center-longitudinal axis A, which is formed by the inside of the jacket, and the inside of the shaped piece.

It can be seen that the pipe coupling according to the invention with the hollow-cylindrical shaped piece, due to the special design of the ribs of the shaped piece and their relationship to the diameter of the shaped piece, not only couples the hollow strand inserted into the shaped piece according to the invention from the other end towards the free end in a fixed manner , rather the loosening of the hollow strand compared to the prior art due to the occurrence of tensile and shear forces as well as shrinkage or shrinkage of the hollow strand, which are able to act in the direction from one free end of the shaped piece towards the other free end of the shaped piece according to the invention, are permanent is.

In addition, although the hollow strand can be inserted in the direction from the other end to the free end of the shaped piece, however, due to the special configuration of the ribs and their number, the use excludes the usually occurring return movements. An embodiment of the hollow cylindrical shape is preferred in which the number of rib rings depends on the inside diameter of the shape. The number of rib rings is preferably 5 to 10% of the inside diameter of the shaped piece as an integer.

Furthermore, the subject matter of the invention relates to a pipe coupling, which comprises the fitting according to the invention and a hollow strand. The hollow strand can be produced from any material, such as PVC, C-PVC, polyolefin of the crosslinked and / or uncrosslinked type or the like, only the hollow strand being elastic at least in the region of its outside such that the ribs of the sawtooth-like type on the inside of the Cladding can be pressed into this and remain quasi stationary in it.

In the context of the invention, a fixed connection is understood to mean that, although the ribs are able to penetrate into the outside of a hollow strand, the movement of the hollow strand along the center-longitudinal axis of the shaped piece from one free end of the shaped piece to the other free end is sufficiently prevented is to be caused without mechanical damage to the outside of the hollow strand. The pipe coupling according to the invention has a shaped piece, the hollow strand being pushed in from the other end of the shaped piece in the direction of one free end of the shaped piece. The outside of the hollow strand lies tightly face to face on the inside of the molding. The shaped part according to the invention preferably has a bevel at the other end. The bevel is designed as a chamfer in such a way that the inside in the area of the other end is chamfered or curved away towards the outside and the chamfer as a chamfer includes an angle γ of 30 to 45 °, preferably 28 °, with the inside. The chamfer-like configuration of the other end of the shaped piece facilitates the insertion of the hollow strand. Since the outside of the hollow strand can rest against the inside of the shaped piece, a hollow strand is inserted, the outer diameter of which is larger than the inner diameter of the shaped piece, so that a hollow strand can also be inserted, the front end of which faces the one end of the shaped piece is blunt.

The plane of the end face of the hollow strand is preferably aligned and flush with the plane of the end face of the fitting end. In addition, the end face of the hollow strand can be formed at least partially beyond the end face of the fitting end, in order to enable an outstanding tightness of the connection point when coupling two hollow strands with the aid of the fitting.

In the context of the invention, media are also understood to mean gases, acid, alkali, organic liquids or the like.

A blunt design is also understood to mean that the front end of the hollow strand is formed at a right angle with the inside and the outside of the hollow strand or is perpendicular to the central longitudinal axis A of the hollow strand. The hollow strand is inserted into the shaped part with heating and / or application of force to such an extent that the blunt front end of the hollow strand is aligned flush and flush with the end face of one free end of the shaped piece.

For the purposes of the invention, flush alignment is also understood to mean that the plane of the end face of the hollow strand and the plane of the end face of one end of the shaped piece form a common plane.

Aligning in the sense of the invention also means that the levels e.g. of the end face of the hollow strand and the end face of the shaped body are arranged in a longitudinal section on a straight line or correspond to one another.

Due to the aligned and flush alignment of the planes of the ends of the hollow strand and the molded body after insertion of the same into the molded body, the attack, frequently observed in the prior art, of media which can be conveyed in the hollow strand is effectively prevented, since the The entire area of the inside of the shaped piece is encased by the hollow strand. In addition, a shifting of the hollow strand from one free end towards the other free end of the molded part according to the invention can be adequately achieved due to the special configuration of the ribs, the configuration of the ribs in relation to the inside diameter of the molded part and the number of rib rings of the molded part provide effective support.

embodiment

The drawing shows, in a schematic, greatly enlarged manner, without claim to a true-to-scale reproduction in longitudinal section, an invented Pipe coupling according to the invention with a fitting with a hollow strand inserted into the fitting.

The hollow cylindrical shaped piece 1 has a jacket 12. The inside 3 of the jacket 12 has rings 30 made of ribs 10 which are aligned parallel to one another. The ribs 10 are configured on the unequal side in longitudinal section. After inserting a hollow strand 15 made of polyolefin of the crosslinked type from the other free end 31 into the shaped piece 1 in the direction of the one free end 4 of the shaped piece 1, the ribs 10 penetrate into the region of the outer side of the hollow strand 15, so that the connection between the hollow strand 15 and the fitting 1 is positive and non-positive.

In addition, this connection can also be supported by a frictional connection between the hollow strand 15 and the shaped piece 1, since the hollow strand 15 with a larger diameter compared to the inner diameter of the shaped piece 1 can be inserted into the same. The insertion of the hollow strand 15 into the molding 1 is made possible by a circumferential bevel 33 on the inside 3 of the jacket 12 of the other end 31 of the molding 1. The inside 3 is chamfered towards the outside to form an angle γ of 28 ° enclosed by the inside and the chamfer.

The ribs 10 have a side 6 which faces the one end 4 of the molded part 1. The side 6 is oriented perpendicular to the central longitudinal axis A or the inside 3 of the molded part 1. The other side 7 of the rib 10 in longitudinal section forms an angle β of 3 ° with one side 6 of the jacket 12. The inside 3 includes an angle α of 87 ° with the other side 7.

The molding 1 is formed in one piece with the ribs 10. The fitting 1 is made of brass. The hollow strand 15, which is inserted from the other free end 31 in the direction of the one free end 4 of the molded piece 1, is inserted into the molded piece 1 to such an extent that the plane of the front end 40 of the hollow strand 15 coincides with the plane of the end face 41 of the one Free end 4 of the fitting 1 are aligned flush and in alignment. Due to the flush and aligned alignment of both planes 40, 41, a second shaped piece 1 can be coupled face to face with the inserted hollow strand 15 face to face with one another in a media-tight manner by means of conventional screw closures (not shown). The tightness can also be supported if the front end 40 of the hollow strand 15 is partially protruding beyond the front side 41 of the fitting end.

The connection of two abutting fittings 1 takes place by means of conventional flange connections, screw connections or the like.

Preferably, one of the crosslinked or uncrosslinked polyolefin type is used as the hollow strand 15. However, other hollow strands of uncrosslinked or crosslinked polyolefins, polyethylene (PE-X), polyvinylchloride (PVC), PVC-C, PUDF and polyketones or the like can also be used (not shown). The compression factor is 0.95. The height H of a rib is 6% of the value of (A _u ), with (A _u ) being 54.18 mm.

Foot F is to be understood as the distance from the beginning of the beveling of the other side 7 of the rib 10 of the molding 1 to the point of intersection of the one side 6 of the rib 10 with the inside 3 of the molding 1.

F can be determined mathematically with knowledge of the angles α and β and the height H of the rib 10. The ribs 10 extend all around on the inside 6 of the molded piece 1. However, the ribs 10 can also extend interrupted on the inside 6 of the molding 1. The circumferential or interrupted ribs 10 form rib rings 30 which have a common central longitudinal axis A, which correspond to the central longitudinal axis A of the inside 3 of the jacket 12 of the molded part 1.

The distance XI from the fitting end of the one free end 4 of the fitting 1 of the pipe coupling according to the invention to the first fin ring 30 or 10a is 20%, the distance X2 from the fitting end of the one free end 4 of the fitting 1 to the second fin ring 30 or 10b 50% and the distance X3 from the fitting end of one free end 4 of the fitting 1 to the third rib ring 30 or 10c 70% of the length of the fitting according to the invention, which stands for 100%.

The pipe coupling according to the invention with the fitting 1 according to the invention and the inserted hollow strand 15 made of polyolefins of the crosslinked type enables the inserted hollow strand 15 to be adequately wedged into the fitting 1, suppresses the contact of the fitting 1 with the media to be transported in the hollow strand 15 and enables a sufficiently sealing Connection of two fittings to be coupled together 1.

Claims

1. Hollow cylinder-like shaped piece for the permanent connection of hollow strands, preferably hollow strands made of polyolefins of the crosslinked and / or uncrosslinked type, which has a jacket (12) with an inside (3) and a free end (4) and another free end (31) , characterized in that in longitudinal section on the inside (3) of the casing (12) of the shaped piece (1) three circumferentially arranged ribs (10a, 10b, 10c) of the sawtooth-like type are arranged at a distance X apart, the ribs (10a , 10b, 10b) are configured on the unequal side in longitudinal section, the one side (6) of the ribs (10a, 10b, 10c) facing the one free end (4) being shorter than the other side (7) facing away from the one free end (4) ), one side (6) with the inside (3) of the jacket (12) of the shaped piece (1) forms an angle α of 1 to 90 °, the other side (7) with the inside (3) of the jacket ( 12) of the fitting (1) an angle ß of 1 to 15 ° the distance XI of the first rib (10a) from the fitting end of the one free end (4) is 15 to 29%, the distance X2 of the second rib (10b) from the fitting end of the one free end (4) 40 to 50%, and the distance X3 of the third rib (10c) from the fitting end of the one free end (4) is 68 to 76% of the length of the fitting.

2. Hollow cylinder-like shaped piece for connecting hollow strands, preferably hollow strands made of polyolefins, according to claim 1, characterized in that the height H of the third rib (10c) is 5 to 8% of the value of the non-compressed outer diameter of the hollow strand (A _u ).

3. Hollow-cylinder shaped piece for connecting hollow strands, preferably hollow strands made of polyolefins of the crosslinked and / or uncrosslinked type according to claim 1 or 2, characterized in that the other side (7) with the inside (3) includes an angle β of 3 °.

4. hollow cylinder-like shaped piece for connecting hollow strands, preferably hollow strands made of polyolefins of the crosslinked and / or uncrosslinked type according to one of claims 1 to 3, characterized in that the shaped piece (1) is in one piece.

5. hollow cylinder-like shaped piece for connecting hollow strands, preferably hollow strands made of polyolefins of the crosslinked and / or uncrosslinked type according to one of claims 1 to 4, characterized in that the ribs (10a, 10b, 10c) in the circumferential direction of the inside (3) of the Cover (12) as rib rings (30a, 30b, 30c).

6. Hollow cylinder-like shaped piece for connecting hollow strands, preferably hollow strands made of polyolefins of the crosslinked and / or uncrosslinked type according to one of claims 1 to 5, characterized in that the distance XI of the first rib (10a) from the shaped piece end of one free end (4th ) 20%, the distance X2 of the second rib (10b) from the fitting end of the one free end (4) 50%, and the distance X3 of the third rib (10c) from the fitting end of the one free end (4) 70% of the length of the fitting.

7. Pipe coupling with a fitting (1) according to one of claims 1 to 6, characterized in that the fitting (1) Receives hollow strand (15) made of polyolefins of the crosslinked or uncrosslinked type and the free end of the hollow strand (15) with the free end (4) of the shaped piece (1) ends flush and flush.

8. Pipe coupling claim 7, characterized in that the compression factor (ST) is 0.86 to 1.05.

9. Pipe coupling claim 7 or 8, characterized in that the compression factor (ST) is 0.95.

10. Pipe coupling according to one of claims 7 to 9, characterized in that the hollow strand (15) lies with its outside on the inside (3) of the jacket (12) of the shaped piece (1) sealingly.