WO2020099289A1 - Raccordement à manchon coulissant ainsi que procédé de production dudit raccordement - Google Patents

Raccordement à manchon coulissant ainsi que procédé de production dudit raccordement Download PDF

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Publication number
WO2020099289A1
WO2020099289A1 PCT/EP2019/080794 EP2019080794W WO2020099289A1 WO 2020099289 A1 WO2020099289 A1 WO 2020099289A1 EP 2019080794 W EP2019080794 W EP 2019080794W WO 2020099289 A1 WO2020099289 A1 WO 2020099289A1
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WO
WIPO (PCT)
Prior art keywords
sliding sleeve
pipe end
tube
pipe
plastic
Prior art date
Application number
PCT/EP2019/080794
Other languages
German (de)
English (en)
Inventor
Hansi Homburg
Andreas Kirchberger
Thomas Schaaf
Oliver Vocks
Original Assignee
Rehau Ag + Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rehau Ag + Co filed Critical Rehau Ag + Co
Publication of WO2020099289A1 publication Critical patent/WO2020099289A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
    • F16L13/14—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints made by plastically deforming the material of the pipe, e.g. by flanging, rolling
    • F16L13/146—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints made by plastically deforming the material of the pipe, e.g. by flanging, rolling by an axially moveable sleeve

Definitions

  • the present invention relates to a sliding sleeve connection between a tube end of an all-plastic tube, a plastic composite tube or a metal-plastic composite tube and a connecting element, the sliding sleeve connection being a tube end of an all-plastic tube, a plastic composite tube or a metal-plastic composite tube, a connecting element, which comprises at least one supporting body provided with circumferential outer ribs for insertion into the pipe end, and comprises a sliding sleeve axially pushed onto the pipe end.
  • the present invention relates to a method for producing such a sliding sleeve connection.
  • sliding sleeve connections and connecting elements therefor are known from the prior art, for example from DE 101 30 858 A1.
  • Sliding sleeve connections are also known as axial press systems.
  • the support body of the connec tion element which can be made of metallic materials such as brass or plastics such as polyphenyl sulfone (PPSU) and polyvinylidene fluoride (PVDF), inserted into a pipe end.
  • PPSU polyphenyl sulfone
  • PVDF polyvinylidene fluoride
  • the pipe end is fixed to the connecting element via a sliding sleeve pushed onto the pipe end with an inserted support body in the axial direction, through which the pipe end is pressed against the outer cone of the supporting body provided with circumferential outer ribs, which means that after the sliding sleeve is pushed onto the pipe end, one does not Detachable and fluid-tight connection between the support body of the connecting element and the inside of the tube is formed.
  • the sliding sleeve is pushed on using a special pressing tool in the axial direction onto the pipe end with the support body inserted.
  • the connecting element has a circumferential pressing collar, which a pressing yoke of the pressing tool engages around when the sliding sleeve is pushed on.
  • the pressing collar is the component of the connecting element that is exposed to the highest mechanical loads, so that the pressing collar must be made considerably thicker than the other components of the connecting element.
  • the required material accumulation in the area of the press collar cools during the manufacture of the connection tion element, for example, in the production of castings and injection molded parts from slower than the other components of the connecting element, such as the support body. In the production of connecting elements from plastic materials, this leads to longer cycle times of the injection molding machines, which leads to higher manufacturing costs for the connecting elements.
  • the object of the present invention is to provide a sliding sleeve connection which overcomes the disadvantages of the prior art.
  • the connecting element used in the sliding sleeve connection according to the invention should be able to be produced with a reduced material expenditure and reduced production costs.
  • the object of the present invention is to provide a method for producing such a sliding sleeve connection.
  • the pipe stiffness of the all-plastic pipe, the plastic composite pipe or the metal-plastic composite pipe is sufficient to absorb the shear and bending forces occurring during the pressing process. It is therefore possible to attach a pressing yoke of the pressing tool directly to the end of the tube pushed onto the supporting body of the connecting element, so that the tube end itself takes over the function of the pressing collar during the pressing operation. It is therefore possible to use connecting elements without a compression collar in a sliding sleeve connection, especially since the compression collar is only required for the one-time pressing process and it then no longer has any function.
  • the present invention resides in the provision of a sliding sleeve connection between a tube end of an all-plastic tube, a plastic composite tube or a metal-plastic composite tube and a connecting element, wherein the sliding sleeve connection is a tube end of an all-plastic tube, a plastic composite tube or a metal-plastic Composite pipe, a connecting element, the at least one supporting body provided with circumferential outer ribs for insertion into the pipe end and comprises a sliding sleeve axially pushed onto the pipe end, the sliding sleeve connection being distinguished according to the invention in that the connecting element does not have a circumferential pressing collar for attacking a pressing tool for axially pushing on the sliding sleeve having.
  • the present invention is to provide a method for producing a sliding sleeve connection between a pipe end of an all-plastic tube, a plastic composite tube or a metal-plastic composite tube and a connec tion element, wherein the connecting element at least one supporting body provided with circumferential outer ribs for sliding of the pipe end, the process comprising the following stages:
  • the method according to the invention is characterized in that one of the pressing yokes acts on the sliding sleeve and one of the pressing yokes acts on an end face of the pipe end during the pushing on.
  • the pipe end has an essentially identical inside diameter compared to the regular inside diameter (ie the inside diameter that the pipe has after extrusion essentially over its entire pipe length) or a ge compared to the regular one Inside diameter has an enlarged inside diameter.
  • an inside diameter that is essentially identical to the regular inside diameter means that the inside diameter of the pipe end was not expanded by a separate expanding process using a so-called expanding tool.
  • the inner diameter of the pipe end is slightly increased, for example by up to about 5%, compared to the regular inner diameter by inserting the support body of the connecting element, or the pipe end in the sliding sleeve connection according to the invention is affected by the action of the axially pushed-on sliding sleeve is compressed, so that the inside diameter of the pipe end is slight, for example by up to about 10%, is reduced compared to the regular inner diameter.
  • a sliding sleeve connection according to the invention in which the pipe end has an essentially identical inside diameter compared to the regular inside diameter, the process for producing it is greatly simplified because the step of widening the pipe end is omitted. If the pipe end has a thinner inside diameter than the regular inside diameter, the sliding sleeve connection according to the invention has an improved tightness and connection security because of the memory memory of the pipe material.
  • the sliding sleeve connection further comprises an inner sleeve which is arranged between the outer surface of the pipe end and the sliding sleeve.
  • the arrangement of such an inner sleeve between the outer surface of the pipe end and the sliding sleeve increases the tightness and connection reliability of the sliding sleeve connection according to the invention. Pushing the sliding sleeve onto the inner sleeve leads to an expansion of the sliding sleeve, as a result of which this exerts a radially inward force on the inner sleeve.
  • the inner sleeve preferably comprises at least one cylindrical section.
  • the cylindrical section leads to a reduced inclination of the sliding sleeve to an axial relative movement (for example due to a temperature change stress).
  • This at least one cylindrical section preferably extends overall over a large part of its length, preferably over at least 60% of the length of the inner sleeve, particularly preferably over at least 75% of the length of the inner sleeve.
  • the inner sleeve can also include a stop on the inside for defined positioning at the pipe end.
  • the inner sleeve can comprise an axial slot and / or a contouring, by means of which the ring stiffness of the inner sleeve is reduced and the pushing of the sliding sleeve onto the inner sleeve is facilitated and the transmission of force from the sliding sleeve to the pipe end is improved.
  • the inner sleeve On its inner surface, the inner sleeve may have an inner surface structure or contour, which is suitable for a possible axial relative movement of the inner sleeve on the tube, for. B. to prevent temperature fluctuations.
  • the outer surface of the inner sleeve may have a surface structure or contour, which is suitable for a possible axial relative movement of the sliding sleeve, for. B.
  • the outer surface of the inner sleeve can have a surface structure or surface contour that is suitable for improving the push-on ability of the sliding sleeve (e.g. reduction of the pressing force, reduction of noise during the connection).
  • the inner surface and / or the outer surface of the sliding sleeve can have a mean roughness value R a in a range from 1 gm to half the average wall thickness of the sliding sleeve and / or an average roughness depth R z in a range from 5 gm to Have half the average wall thickness of the sliding sleeve and / or have a plurality of macroscopic bumps, the depth of which should not exceed half the average wall thickness of the sliding sleeve.
  • mean roughness or “mean roughness” (represented by the symbol “R a ”) of a surface as used herein means the arithmetic mean of the deviations in amount of all measuring points on the surface from the center line of the surface and the term “Average roughness depth” (represented by the symbol “R z ”) of a surface, as used herein, means the roughness depth according to DIN EN ISO 4287/4288.
  • the inner sleeve can comprise, for example, a rib on its outer side, in particular in a triangular or rectangular shape.
  • the outer surface of the inner sleeve can be provided with a coating in order to improve the push-on ability of the sliding sleeve (e.g. reduction of the compressive force, reduction of noise during connection establishment).
  • the inner sleeve of the sliding sleeve connection it can also be advantageous if it has an angled end which at least partially covers an end face of the pipe end.
  • a pressing yoke of the pressing tool When a pressing yoke of the pressing tool is placed on the end face of the pipe end, there is direct contact between the pressing yoke and the pipe end.
  • the pipe stiffness is not sufficient to absorb the forces that occur during the pressing without deformation. This can lead to a visually unattractive pressing picture.
  • contact can also result in technical defects. For example, cases can arise in which the sliding sleeve is not completely pushed open or the pipe end is open.
  • the pressing yoke does not act directly on the end face of the pipe end, but only indirectly. The contact then takes place between the pressing yoke and the angled end of the inner sleeve, from which the force is is transferred more moderately to the end face of the pipe end, whereby the disadvantages described are avoided.
  • the pipe connection comprises a sliding sleeve made of an elastically deformable polymeric material that is pushed axially onto the pipe end. This increases the stability of the sliding sleeve connection according to the invention.
  • At least one of the circumferential outer ribs of the support body has a sawtooth-like cross section and / or at least one of the circumferential outer ribs has a substantially rectangular cross section.
  • the presence of a rectangular sealing rib contributes to a secure seal between the pipe and the connecting element in the sliding sleeve connection according to the invention, while a sawtooth-shaped peripheral rib in the sliding sleeve connection according to the invention effectively prevents the pipe end from slipping off the supporting body of the connecting element.
  • the method further comprises the step of widening the pipe end.
  • This expansion step increases the inside diameter of the pipe end. This also increases the force with which the widened pipe end presses against the supporting body used therein with circumferential outer ribs, which ensures a constant tightness of the sliding sleeve connection according to the invention.
  • the method according to the invention is greatly simplified because the step of expanding the tube end is omitted. A separate expanding tool is also not required.
  • the method further involves the step of pushing an inner sleeve onto the pipe end and axially pushing the sliding sleeve onto the pipe end with the support body inserted therein such that the inner sleeve is arranged between the outer surface of the pipe end and the sliding sleeve .
  • the inner sleeve has an angled end, which at least partially covers an end face of the tube end, so that during the pushing on one of the pressing yokes acts on the sliding sleeve and one of the pressing yokes on the angled end of the inner sleeve.
  • preferred materials for the connecting element are polymeric materials such as, for example, polypropylene and glass fiber-reinforced polypropylene, polyamides and glass fiber-reinforced polyamides, temperature-resistant thermoplastics such as polyphenylsulfone (PPSU), polyvinylidene fluoride (PVDF), polyether sulfone (PES), polysulfone (PSU), Polyphenylene sulfide (PPS), acrylonitrile-butadiene-styrene copolymer (ABS), polyoxymethylene (POM) and polyester carbonate (PESC) as well as copolymers and blends of these polymers, whereby these polymer materials can also be used fiber-reinforced, in particular glass-fiber-reinforced, as well as metallic materials such as brass, especially Ecobrass®, gunmetal and stainless steel for use.
  • PPSU polyphenylsulfone
  • PVDF polyvinylidene fluoride
  • PES poly
  • Temperature-resistant thermoplastics such as, in particular, polyphenyl sulfone and polyvinylidene fluoride, are particularly preferred for producing the connecting element according to the invention.
  • the term “temperature-resistant thermoplastics”, as used herein, refers to the heat resistance and thermostability of this group of materials and refers to thermoplastic polymer materials with a heat resistance at temperatures of at least 150 ° C. The upper limit of the temperature at which such a temperature-resistant plastic can be used depends on the material used, the usability of such polymer materials ending at a maximum of 260 ° C.
  • plastic pipes are all-plastic pipes, before being made of polyethylene (PE, in particular PE 100 and PE-RT (polyethylene with increased temperature resistance)), cross-linked polyethylene (PE-X, in particular PE-Xa, PE-Xb and PE- Xc), polypropylene (especially statistical polypropylene PP-R) and polybutylene (PB); as well as plastic composite pipes, preferably with layers of polyethylene (PE, in particular special PE 100 and PE-RT), cross-linked polyethylene (PE-X, in particular PE-Xa, PE-Xb and PE-Xc), polypropylene (in particular statistical polypropylene PP -R), and / or polybutylene (PB) and metal-plastic composite pipes (MKV pipes) are used.
  • PE polyethylene
  • PE-X polyethylene with increased temperature resistance
  • PE-X polypropylene
  • PB polybutylene
  • MKV pipes metal-plastic composite pipes
  • a layer of ethylene-vinyl alcohol copolymer (EVOH) can additionally be present as the oxygen barrier layer.
  • metal-plastic composite pipes preferably comprise layers of polyethylene (PE, in particular PE 100 and PE-RT), cross-linked polyethylene (PE-X, in particular PE-Xa, PE-Xb and PE- Xc), polypropylene (in particular statistical polypropylene PP-R) and / or polybutylene (PB) and at least at least one layer of metals, preferably aluminum.
  • the metal layer is preferably butt-welded.
  • bonding agent layers can be introduced between individual layers.
  • all tubes of a tube connection according to the invention can be constructed identically or one or more of the tubes can have different tube structures.
  • the tubes according to the present invention can also be fiber reinforced.
  • the fiber reinforcement of the line pipes can be present in individual pipes or in all pipes, over the entire pipe length or only in sections.
  • at least one layer of the respective pipe res comprises cross-linked polyethylene (in particular PE-Xa, PE-Xb and PE-Xc).
  • the material "cross-linked polyethylene” is a material that has a shape memory or a so-called "memory effect".
  • This memory effect is due to the fact that the cross-linked polyethylene tries to return to its original form after changing its external geometry.
  • the connecting element of the sliding sleeve connection can be a threaded molded part or a threadless molded part, that is to say a connecting element that has no thread.
  • threaded molded part refers to a connecting element that has at least one threaded molded part. This includes in particular connection pieces, connection brackets, multiple distributors, T-pieces, wall T-pieces, wall brackets, system transitions, transition pieces and angled transition pieces, each of which has at least one internal and / or external thread.
  • suitable materials for the sliding sleeve and / or the inner sleeve are preferably those materials which are mentioned in relation to the connecting element of the pipe connection according to the invention.
  • Temperature-resistant plastics and Special polyphenyl sulfone, polyvinylidene fluoride, polypropylene and polyoxymethylene are particularly preferred as materials for the sliding sleeve and / or the inner sleeve.
  • Cross-linked polyethylene in particular PE-Xa, PE-Xb and PE-Xc is also particularly preferred as the material for the sliding sleeve and / or the inner sleeve.
  • the material of the connecting element has a higher stiffness than the materials of the inner sleeve, the sliding sleeve and the tube. It is further preferred if the material of the inner sleeve has a higher rigidity than the materials of the sliding sleeve and the tube. It is also preferred if the material of the sliding sleeve has a higher rigidity than the material of the tube.
  • the sliding sleeve connection according to the present invention is used in particular in line and connection systems in drinking water installations, in sprinkler systems, in heating body connections, in concrete core temperature control systems and in surface heating and / or surface cooling systems.
  • the sliding sleeve connection according to the invention as well as individual parts thereof can also be produced line by line or layer by layer using a line construction or layer construction manufacturing process (e.g. 3D printing). However, it is preferred if the tube is produced by extrusion. It is also preferred if the connecting element, the sliding sleeve and / or the inner sleeve are made by means of injection molding.
  • Fig. 1 is a cross-sectional view of a sliding sleeve connection according to an embodiment of the present invention
  • FIG. 2 shows a cross-sectional illustration of a sliding sleeve connection according to a further embodiment of the present invention
  • Fig. 3 is a perspective view of a slide sleeve usable in the inventive sliding sleeve connection
  • Fig. 4 is a perspective view of another sliding sleeve insertable in the sliding sleeve connection according to the invention.
  • Fig. 5 is a cross-sectional view of the sliding sleeve connection according to the invention shown in Fig. 2 before the axial pressing of the sliding sleeve.
  • the sliding sleeve connection 1 shows an embodiment of a sliding sleeve connection 1 according to the invention in a cross-sectional view.
  • the sliding sleeve connection 1 according to the invention comprises a connecting element 2, which comprises two supporting bodies 4, 4a provided with circumferential outer ribs 3, 3a, 3b, 3c for insertion into a pipe end 5, the pipe end 5 of an all-plastic pipe 6, in that a support body 4 of the connecting element 2 is inserted, and comprises a sliding sleeve 7 axially pushed onto the tube end 5.
  • the connecting element 1 is a connecting piece with two essentially cylindrical supporting bodies 4, 4a, wherein in the embodiment shown in FIG.
  • each of the supporting bodies 4, 4a has four circumferential outer ribs 3, 3a, 3b, 3c.
  • These four circumferential outer ribs 3, 3a, 3b, 3c extend in the axial direction from the open end of the connecting element 2 so arranged that on a saw-toothed circumferential outer rib 3 three successive circumferential outer ribs 3a, 3b, 3c with a substantially rectangular cross-section follows. This is followed by a slight increase 8, which connects the two support bodies 4, 4a to one another.
  • the connecting element 2 does not include a pressing collar that runs around and on which a pressing tool could engage when the sliding sleeve 7 is pushed on axially. Also, an attack of the pressing tool on the slight elevation 8 is not practical, because the pressing tool could easily slip off due to the high shear and bending forces acting when the sliding sleeve 7 is pushed on axially.
  • the connecting element 2 shown in Fig. 1 is formed mirror-symmetrically to a plane which runs centrally through the slight increase and perpendicular to the axis of the connecting element 2.
  • the executions made with respect to the support body 4 apply accordingly to the support body 4a in an analogous manner.
  • the connecting element 2 according to the invention is a component made of polyphenyl sulfone (PPSU).
  • PPSU polyphenyl sulfone
  • the tube 6 is an all-plastic tube 6 made of cross-linked polyethylene (PE-X, in particular PE-Xa, PE-Xb or PE-Xc).
  • PE-X cross-linked polyethylene
  • all-plastic pipes made of other materials as well as plastic composite pipes and metal-plastic composite pipes can also be used as pipe 6 in other embodiments of the present invention.
  • the layer facing the light diameter of the tube 6 is preferably a layer of cross-linked polyethylene (PE-X), in particular PE-Xa, PE-Xb or PE-Xc.
  • a further tube 6 can be connected to the second support body 4a by a sliding sleeve connection 1 according to the invention.
  • the further tube 6 can have an identical tube structure to the tube 6 on the support body 4 or can be constructed differently from the tube 6 of the support body 4.
  • the sliding sleeve 7 used to fix the pipe end 5 on the support body 4 is a sleeve made of polyvinylidene fluoride (PVDF), which has a constant cross section over its entire length and only has an insertion bevel at both ends .
  • PVDF polyvinylidene fluoride
  • sliding sleeves 7 made of other materials, in particular advantageously made of cross-linked polyethylene (in particular PE-Xa, PE-Xb or PE-Xc) can also be used.
  • the sliding sleeve 7 has an inner surface with an average roughness R a in a range of 4 pm. The sliding sleeve 7 with higher roughness of the inner surface has a reduced tendency for a relative movement of the sliding sleeve 7 on the pipe end 5, in particular in the event of temperature changes.
  • the sliding sleeve 7 is first pushed over the end 5 of the plastic tube 6. Then a wide tool is inserted into the end of the plastic tube 6 and the plastic tube 6 one end expanded using an expanding tool. Then the support body 4 of the connecting element 2 is inserted into the widened end 5 of the plastic tube 6 until the widened end 5 of the plastic tube 6 approximately abuts the slight elevation 8. Due to the memory effect of the tube material, the expanded En de 5 of the plastic tube 6 contracts, the plastic material of the plastic tube 6 being pressed into the outer contour of the support body 4 of the connecting element 2. From closing, the sliding sleeve 7 is pushed by a suitable pressing tool or pushing tool in the axial direction onto the widened end 5 of the plastic tube 6 with the inserted support body 4, around the widened end 5 of the plastic tube
  • FIG. 2 Another preferred embodiment of a sliding sleeve connection 1 according to the invention is again shown in FIG. 2 in a cross-sectional view.
  • the sliding sleeve connection 1 according to the invention comprises in the embodiment according to FIG. 2 a connec tion element 2, a tube end 5 of an all-plastic tube 6, into which the support body 4 of the connecting element 2 is inserted, and a sliding sleeve 7 axially pushed onto the tube end 5
  • Embodiment of the sliding sleeve connection 1 according to the invention between the outer surface of the tube end 5 and the sliding sleeve
  • an inner sleeve or crimp sleeve 10 is arranged.
  • the connecting element 2 according to FIG. 2 differs from the connecting element 2 shown in FIG. 1 only in that the two support bodies 4, 4a each comprise four circumferential outer ribs 3, 3a, 3b, 3c, which are each rectangular in shape, and each a slight increase 8, 8a closes the respective support body 4, 4a in the axial direction, while in the connecting element 2 according to FIG. 1 only a slight increase 8 connects the two support bodies 4, 4a to one another.
  • the connecting element 2 of the sliding sleeve connection 1 according to the invention does not have a circumferential pressing collar on which a pressing tool could engage when the sliding sleeve 7 is pushed on axially. An attack by the pressing tool on the slight elevation 8, 8a is also out of the question because the pressing Press tool due to the high, when pushing the sliding sleeve 7 axially, the shear and bending forces could easily tilt or slip.
  • the tube 6 is designed as a plastic composite tube 6 made of polyethylene with an inner layer made of PE-RT (polyethylene with increased temperature resistance).
  • PE-RT polyethylene with increased temperature resistance
  • all-plastic pipes and plastic composite pipes made of other materials and metal-plastic composite pipes can also be used as pipe 6. It is again possible to connect a further tube 6 to the second support body 4a by means of a sliding sleeve connection 1 according to the invention, which in turn has an identical tube structure to the tube 6 on the support body 4 or else be constructed differently from the tube 6 of the support body 4.
  • FIG. 3 An inner sleeve 10, which can be used according to the embodiment of the sliding sleeve connection 1 according to the invention shown in FIG. 2, is shown in FIG. 3 in a perspective view.
  • the inner sleeve 10 increases the tightness and connection security of the sliding sleeve connection 1 according to the invention, because the application of the sliding sleeve 7 to the inner sleeve 10 leads to an expansion of the sliding sleeve 7. Through this expansion of the sliding sleeve 7, this exerts a radially inward force on the inner sleeve 10, which is transmitted to the tube end 5, so that the tube end 5 is pressed against the circumferential outer ribs 3, 3a, 3b, 3c of the support body 4 becomes.
  • the inner sleeve 10 comprises a cylindrical section 12, which extends over approximately 75% of the length of the inner sleeve 10.
  • the approximate shape in the shown Ausfer has a triangular shape, but alternatively can also be rectangular, for example, and by the possible axial relative movement of the inner sleeve 10 on the pipe end 5, z. B. is prevented by thermal cycling.
  • the inner sleeve 10 has axial slots 14, 14 a, which extend in a straight line over the entire length of the inner sleeve 0 and are evenly distributed over the outer circumference of the inner sleeve 10.
  • the axial slots 14, 14a can also have a different geometry or extend in the longitudinal direction only over part of the inner sleeve 10.
  • the ring stiffness of the inner sleeve 10 is reduced, as a result of which the compressive force required to push the sliding sleeve 7 onto the inner sleeve 10 is reduced and, in particular, also the power transmission from the sliding sleeve 7 on the pipe end 5 is improved.
  • the inner sleeve 10 has an angled end 15, which is interrupted by notches 16, 16 a, which extend into the cylindrical section 12. The notches 16, 16a further reduce the ring rigidity of the inner sleeve 10.
  • the angled end 15 is bevelled toward the cylindrical section 12. This contributes to the positional stability of the sliding sleeve 7 relative to the inner sleeve 10.
  • An insertion bevel 17 is arranged on the side of the inner sleeve 10 opposite the angled end 15.
  • the inner sleeve 10 is made as an injection molded component made of polyoxymethylene (POM).
  • POM polyoxymethylene
  • the inner sleeve 10 can also comprise other materials that have been mentioned in relation to the material of the sliding sleeve.
  • Fig. 4 shows an embodiment of an inner sleeve 10 which can be used in the sliding sleeve connection 1 according to the invention, again in a perspective view.
  • the inner sleeve 10 shown in FIG. 4 is formed as an injection molded component made of polyoxymethylene (POM) and comprises a cylindrical portion 12 which, with the exception of the insertion slope 17, extends over the entire length of the inner sleeve 10.
  • the inner sleeve 10 has axial slots 14, 14 a, which extend in a straight line in the cylindrical section 12 and are evenly distributed over the outer circumference of the inner sleeve 10.
  • the axial slots 14, 14a can also have a different geometry or extend in the longitudinal direction only over part of the inner sleeve 10.
  • the ring stiffness of the inner sleeve 10 is reduced, which in particular improves the transmission of force from the sliding sleeve 7 to the tube end 5.
  • the angled end 15 of the inner sleeve 10 is in turn interrupted by Einker exercises 16, 16a, which he stretch into the cylindrical portion 12.
  • further notches 1 1 are present in the lead-in chamfer.
  • the notches 16, 16 a and further notches 1 1 also contribute to reducing the ring rigidity of the inner sleeve 10.
  • the sliding sleeve 7 used to fix the pipe end 5 on the support body 4 is a sleeve made of polyvinylidene fluoride (PVDF), which has a constant cross section over its entire length and only has an insertion bevel at both ends .
  • PVDF polyvinylidene fluoride
  • sliding sleeves 7 made of other materials can also be used.
  • the sliding sleeve 7 has a roughness on its inner surface, by means of which the pushing onto the inner sleeve 10 is facilitated on the one hand and a tendency to a relative movement of the sliding sleeve 7 on the inner sleeve 10, in particular in the case of temperature change stress, on the other hand, is reduced.
  • the embodiment of the sliding sleeve connection 1 according to FIG. 2 can be produced as follows according to the method according to the invention: First, the sliding sleeve 7 is pushed over the end 5 of the plastic tube 6. Then the tube end 5 is inserted into the inner sleeve 10 until the end face 9 of the plastic tube 6 strikes the angled end 15 of the inner sleeve 10. Then the support body 4 of the connecting element 2 is inserted into the end 5 of the plastic tube 6 until the end 5 of the plastic tube 6 abuts the slight elevation 8 approximately.
  • FIG. 5 in a cross-sectional representation.
  • a pressing yoke 18 of the pressing tool rests directly on the angled end 15 of the inner sleeve 10, while another pressing yoke 18a rests on the opposite end of the sliding sleeve 7.
  • a drive of the pressing tool now pushes the sliding sleeve 7 in the direction of the pressing yoke 18, which is indicated by an arrow in FIG. 5, until the sliding sleeve touches the pressing yoke 18.
  • the force acting through the pressing yoke 18 is carried out on the angled end 15 of the inner sleeve 10, so that the force is largely uniformly applied to the end face 9 of the tube end 5 indirectly via the angled end 15 of the inner sleeve 10.
  • the opening of the pipe end 5 is avoided in this way.
  • the step of widening the pipe end 5 is not carried out, so that the pipe end 5 has an essentially identical inside diameter compared to the regular pipe inside diameter. Possibly. can now accordingly another plastic tube 6 or metal-plastic Composite tube 6 on the second support body 4a to form a further sliding sleeve connection 1 according to the invention.
  • the connecting element 2 of the sliding sleeve connection 1 can be a threaded molded part or a non-threaded molded part, that is to say a connecting element which has no thread.
  • the term “threaded molded part” refers to a connecting element that has at least one threaded molded part. This includes in particular connecting pieces, connecting angles, multiple distributors, T-pieces, wall T-pieces, wall angles, system transitions, transition pieces and angled transition pieces, each of which has at least one internal and / or external thread.
  • the connecting element 2 of the sliding sleeve connection 1 is a pipe connector with two pipe connection sections or supporting bodies.
  • the connecting element 2 can be designed as a connecting piece, connecting angle, multiple distributor, T-piece, wall-T-piece, wall angle, system transition, transition piece and angled transition piece, which can each have at least one internal and / or external thread or can be threadless be.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)

Abstract

La présente invention concerne un raccordement (1) à manchon coulissant entre une extrémité (5) de tube d'un tube (6) entièrement en matière plastique, d'un tube (6) composite à base de matière plastique ou d'un tube (6) composite métal-matière plastique et d'un élément de raccordement (2), le raccordement (1) à manchon coulissant comprenant une extrémité (5) de tube d'un tube (6) entièrement en matière plastique, d'un tube (6) composite à base de matière plastique ou d'un tube (6) composite métal-matière plastique, un élément de raccordement (2) qui comprend au moins un corps d'appui (4, 4a) muni de nervures extérieures périphériques (3, 3a, 3b, 3c) et destiné à être introduit dans l'extrémité (5) de tube, et un manchon coulissant (7) destiné à être emmanché axialement sur l'extrémité (5) de tube, l'élément de raccordement (2) ne présentant pas de collet de pression périphérique venant en prise avec un outil de pression pour l'emmanchement axial du manchon coulissant (7). La présente invention concerne en outre un procédé de fabrication d'un raccordement (1) à manchon coulissant entre une extrémité (5) de tube d'un tube (6) entièrement en matière plastique, d'un tube (6) composite à base de matière plastique ou d'un tube (6) composite métal-matière plastique et un élément de raccordement (2), l'élément de raccordement (2) comprenant au moins un corps d'appui (4, 4a) muni de nervures extérieures périphériques (3, 3a, 3b, 3c) pour l'emmanchement de l'extrémité (5) de tube, et le procédé comprenant les étapes suivantes : - emmanchement d'un manchon coulissant (7) sur le tube (6) entièrement en matière plastique, le tube (6) composite à base de matière plastique ou le tube (6) composite métal-matière plastique ; - introduction du corps d'appui (4, 4a) de l'élément de raccordement (2) dans l'extrémité (5) de tube ; - et emmanchement axial du manchon coulissant (7) sur l'extrémité (5) de tube dans laquelle est placé le corps d'appui (4, 4a) de l'élément de raccordement (2), au moyen d'un outil de pression muni d'au moins deux étriers de pression (18, 18a), un des étriers de pression (18a) venant en contact avec le manchon coulissant (7) pendant l'emmanchement, et un des étriers de pression (18) venant en contact avec une face frontale (9) de l'extrémité (5) de tube.
PCT/EP2019/080794 2018-11-12 2019-11-11 Raccordement à manchon coulissant ainsi que procédé de production dudit raccordement WO2020099289A1 (fr)

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DE102018128169.2 2018-11-12
DE102018128169.2A DE102018128169A1 (de) 2018-11-12 2018-11-12 Schiebehülsenverbindung sowie Verfahren zur ihrer Herstellung

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WO2010031760A1 (fr) * 2008-09-16 2010-03-25 Viega Gmbh & Co. Kg Raccord composite en deux pièces
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