MXPA98001059A - Pipe gasket device for fluid conduit under pres - Google Patents

Abstract

The present invention relates to a quick pipe joint device for a fluid conduit under pressure, in particular for a motor vehicle, comprising a rigid sleeve (10) with a first end which is fixed in a sealed manner on said conduit (12, 42) and in which a second end is destined to be connected in a sealed manner to a tubular funnel (32) assembled with a fluid circuit under pressure, characterized in that the stagnation between the sleeve (10) and the funnel (32) is secured by an access ( 16) of elastically deformable material such as rubber or an elastomer, molded on the second sleeve end, the stagnation between the sleeve (10) and the conduit (12) being secured by compression of another elastically deformable material to the first end of the sleeve. cuff, the extremities (14, 16) of the duct (12, 42) and funnel (32) being crimped and guided one inside the other when the sleeve (10) is attached to the emb

Description

PIPE GASKET DEVICE FOR FLUID DUCT UNDER PRESSURE DESCRIPTION OF THE INVENTION The invention relates to a device for quick-pipe connection for fluid conduits under pressure, in particular for automotive vehicles, and in particular, a device for quick-pipe connection for a fluid-circuit conduit under high pressure, for example an electric circuit. power steering, braking or air conditioning, or for a fuel circuit. It is already known, for example from Brevet Patent Application EP-0 606 028, a fast pipe joint device for a relatively weak pressure fluid circuit, such as, for example, a motor cooling circuit. This known device essentially comprises a sleeve of plastic material fixed on the end of a rubber flexible conduit or an elastomer by the intermediation of a molded gasket of an elastically deformable material such as rubber or a alastomer. This type of pipe joint provides excellent results for a fluid under relatively weak pressure, but does not ensure sufficient stagnation if used in a high pressure fluid circuit. In a classic way, the devices of quick pipe joint for high pressure fluid conduits are equipped with many joints to which are attributed the essential disadvantages of not always ensuring an excellent stagnation, of needing an important assembly effort and of being sensitive to fluid phenomena under the effect of pressure and fluid temperature, to the detriment of stagnation. The object of the present invention is essentially to provide a simple and effective solution to the problems of fast pipe joint devices for high pressure fluid circuits. It proposes for this purpose, a quick pipe joint device for fluid conduit under pressure, in particular for automotive vehicle, this device comprises a rigid sleeve in which a first end is fixed in a sealed manner on said conduit and in which a The second end is intended to be connected in a sealed manner to a tubular funnel assembled to a fluid circuit under pressure, characterized in that the stagnation between the sleeve and the funnel is ensured by an elastically deformable material such as rubber or an elastomer molded on the second end of the sleeve, the stagnation between the sleeve and the conduit is ensured by a compression of some other elastically deformable material at the first end of the sleeve, the ends (14, 16) of the conduit (12, 42) and the funnel ( 32) are fitted and guided one inside the other when the sleeve (10) is splicing to the funnel.

The stagnation fittings molded to the second end of the sleeve offer many important advantages to mention about the series of traditional joints: - the contact surface between the funnel and the stagnation accessories held by the sleeve is more important, since it significantly improves the quality of stagnation, - the effort of assembling the funnel inside the accessories is weaker, - the molded accessories are insensitive to the phenomena of fluid under the effect of pressure and the temperature of the fluid. According to another feature of the invention, the end of the conduit is elongated to receive the end of the funnel and is fitted with a play very loose or almost zero inside the sleeve that comes resting on said stacking accessories. Advantageously, the first end of the sleeve is crimped or retracted on the conduit. In a first embodiment of the invention, the aforementioned duct is rigid and the stagnation with the first end of the sleeve is secured by a bed of elastically deformable material molded on the sleeve prior to mounting thereof on the duct. In another embodiment of the invention, the aforementioned duct is a flexible tube of elastically deformable material such as rubber or an elastomer and its end is threaded on a rigid tube crimped into the aforementioned sleeve and ensures stagnation with the first end of that sleeve.

In a third embodiment of the invention, the aforementioned duct is rigid and stagnation with the sleeve is ensured, after the arrangement of the sleeve on the end of the duct, by molding of at least one elastically deformable material between the first tip of the cuff and the duct. Advantageously, the stagnation material between the first end of the sleeve and the conduit and the stagnation material between the second end of the sleeve and the funnel are different from one another. Thus an economy can be realized, being one of the materials of stagnation very yielding in the presence of a fluid under pressure but relatively expensive, the other material of stagnation less yielding but less expensive and which ensures a stagnation "of reinforcement". The invention will be better understood and other features, details and advantages thereof will become clearer upon reading the description that follows, made by way of example as reference to the appended designs herein: - Figures 1 and 2 are two schematic views in axial section of a sleeve and the end of a fluid conduit under pressure; - Figure 3 is a schematic view in axial section showing the sleeve mounted on the duct and crimped on a tubular funnel of a fluid circuit under pressure, Figures 4, 5 and 6 are views corresponding respectively to Figures 1, 2 and 3 but represent another embodiment of the invention; - Figure 7 is a schematic view in axial section again of another embodiment of the invention. Before we refer to Figures 1 and 2 which schematically represent, in axial section, a sleeve 10 forming part of a quick pipe joint device according to the invention and the end of a conduit 12 of the fluid under pressure.

The sleeve 10 is made of a rigid and relatively non-deformable material, for example, a metal or an appropriate plastic material. The conduit 12 of the fluid under pressure is also of a rigid and relatively non-deformable material, for example in a metal or an appropriate plastic material, and comprises an elongated cylindrical end 14 intended to be crimped in the sleeve 10. This is equipped with two accessories of stagnation 16, 18 in which the 16 is molded on the inner face of the sleeve, at a certain distance from its ends, being injected for example inside the sleeve by bundles thereof, the other stagnation fitting 18 being molded on the inner face of the sleeve. an elongated end 22 of the sleeve 10 and overflowing slightly to the side of that end to form an annular edge 24. The internal diameter of the stagnation fittings 18 correspond substantially to the external diameter of the elongated end 14 of the conduit 12 and the internal diameter of the rest of the sleeve 10. The other sealing fitting 16 forms, at its end each turn towards the fitting 18, a prominent support 26 on the inner surface of the sleeve 10, on which the front face 28 of the elongate end 14 of the duct 12. The assembly of the device according to the invention is very simple: The sleeve 10 is crimped at its end 22 on the to elongate end 14 of the conduit 12 until the end 26 of the accessory 16 comes to protrude on the front face of the end 28 of the conduit 12, the accessories 16 and 18 being separated from one another so that a median part of the sleeve 10 secure an elongated end guide 14 to conduit 12. Fixation of sleeve 10 on conduit 12 may be accomplished by crimping or retracting its elongate end 22, as indicated schematically by arrows 30 in Figure 3. Eventually, the outer surface of the elongate end 14 of the conduit 12 can receive a bed of an adherent product, ensuring a good bond with the rubber or the elastomer of the stagnation fitting 18 of the sleeve 10.

The connected conduit 12 of the sleeve 10 can now be connected to a tubular funnel 32 of a fluid circuit under high pressure (notably greater than or equal to 20 bars), this funnel 32 being, for example, metal and comprising a seal 34 in the vicinity of its free end, said weatherstrip with an outer diameter corresponding substantially to the internal diameter of the free end of the sleeve 10, while the external diameter of the funnel 32 corresponds substantially to the internal diameter of the elongated end 14 of the conduit 12. In this way, the free end of the funnel 32 may be crimped over a certain length of the inside of the elongate end 14 of the conduit 12 with a very weak or almost no fire, a first stagnation secured by the fitting 16 applied on the outer surface of the funnel 32 , a second stagnation secured by the fitting 18 between the sleeve 10 and the elongated end 14 of the duct 12. As shown in FIG. schematically in Figure 1, the internal surface of the accessory 16 can be formed with two annular ribs 36 in projection, which form the successive stagnation lines on the outer surface of the funnel 32.

The connection between the sleeve 10 and the funnel 32 can be ensured by means of a U-shaped elastic adhesive or an analog, not shown, of a type well known in the art, which is connected in the slits of the sleeve 10, throughout of the weatherstrip 34 of the funnel 32 which is thus retained inside the sleeve 10.

A crimping or a retraction can also be performed on the sleeve 10 as indicated by the arrows 40, at the level of the stagnation fitting 16 to ensure a better stagnation between the funnel 32 and the sleeve 10. Within this device according to the invention, the stagnation fitting 16 can be made of a material such as that sold under the name "VITTON" or of halogenated nitrile rubber, that is, of a material that can withstand a pressure and a high temperature of the fluid, in the same way as a chemically aggressive nature in the case of a refrigerant fluid, the material of the other stagnation accessory is less expensive and for example of the EPDM or analogous type. In the variant embodiment represented schematically in Figures 4 to 6, the sleeve 10 only comprises a staggered fitting 16 formed by the proximity of its extremity cooperating with the funnel 32, its elongated end 22 depleted, and the fluid conduit 42 is a flexible tube made of elastically deformable material such as rubber or an elastomer, where the end is linked on a rigid tube 44 in metal or an appropriate plastic material, formed with an elongated end 46 in which the outer diameter corresponds sensibly to the inner diameter of the elongated end 22 of the sleeve 10 and in which the internal diameter corresponds substantially to that of the stationary fitting 16. The opposite end 48 of the branch piece 44, located inside the flexible tube 42, may be radially expanded. towards the outside to participate in the fixing of the tube 42 on the branch pipe 44. In the assembly, and as in of the preceding embodiment, the elongate end 22 of the sleeve 10 is threaded onto the elongated end 46 of the socket 44 and is crimped onto that socket as indicated at 48, the tube 42 has a stagnation fitting paper between the end 22 of the sleeve 10 and the tubing 44. The front face of the elongated end 46 of the tubing 44 stands out on the stagnation fitting 16 of the sleeve 10, the tubular funnel 32 of the fluid circuit is linked inside the sleeve 10 and the elongated end 46 of the socket 44, as in the previous embodiment, and the sleeve 10 may be crimped, as indicated at 50, at the level of the stagnation fitting 16 to improve stagnation with the tubular funnel 32. Within the variant embodiment of Figure 7, the sleeve 10 is perfectly cylindrical and has a constant internal diameter over its entire length, corresponding to the external diameter of the elongate end 14 of the fluid conduit 12 which is indicated and shown in Figure 2. In the assembly, the sleeve 10 is lined up on the elongate end 14 of the duct 12, so that it expands on both sides of this elongated end 14, after the assembly is placed in a mold and the stagnation fittings 16 and 18 analogous to those shown in Figure 1 they are formed by injecting one or two stagnation materials from one part into the sleeve 10 to the front face of the elongated end 14 of the conduit 12, from another part between the end of the sleeve 10 and the external face of the conduit 12. In In this case, it is the stagnation fittings 16, 18, which perform the fixing of the sleeve 10 on the conduit 12. The final device obtained in this way is used like that of Figures 1 and 2, the free end of the tubular funnel 32 of the fluid circuit being connected to the interior of the sleeve 10 and of the stagnation fittings 16 as well as to the interior of the elongated end 14 of the conduit 12. The devices that they have just been described, they are characterized by the relatively loose mounting efforts on the funnels 32 due to the use of stagnation fittings molded in the place of the joints. In addition, and as seen well in Figures 3, 6 and 7, the stagnation fittings 16 are protected against fluid phenomena resulting from pressure and fluid temperature. The stagnation fittings 16 and 18 stagnate in two levels, on two surfaces much wider than those of the joints, in order to obtain an excellent face-to-face stagnation of the fluids under high pressure. In a variant, the sealing fittings 16 and / or 18 can be molded on the outer surface of the sleeve 10. For example, the sleeve 10 of Figure 7 can comprise the sealing fittings 16, 18, molded on their outer surface and linked at the elongated ends of the duct 12 of the funnel 32, which are now the hollow pieces.

Claims (2)

1. - Quick pipe joint device for fluid conduit under pressure, in particular for a motor vehicle, comprising a rigid sleeve (10) with a first end that is fixed in a sealed manner on said conduit (12, 42) and in which a The second end is intended to be connected in a sealed manner to a tubular funnel (32) assembled with a fluid circuit under pressure, characterized in that the stagnation between the sleeve (10) and the funnel (32) is secured by an accessory (16). ) of elastically deformable material such as rubber or a alastomer, molded on the second sleeve end, the stagnation between the sleeve (10) and the conduit (12) being secured by compression of another elastically deformable material to the first end of the sleeve , the extremities (14, 16) of the conduit (12, 42) and funnel (32) being crimped and guided one inside the other when the sleeve (10) is attached to the funnel.

2 - . 2 - Device according to claim 1, characterized in that said accessory (16) covers the inner surface of the second end of the sleeve (10) and comprises the circular ribs (36) on its internal surface, intended to form the lines of stagnation on the outer surface of the funnel (32). 3 - Device according to claim 1 or 2 characterized in that the end (14) of the conduit (12) is elongated to receive said funnel (32) with a weak or almost zero game and is set with a loose or almost zero game at inside the sleeve (10), which comes resting on said stagnation fitting (16) of the second end of the sleeve. 4. Device according to any of the preceding claims, characterized in that the first end of the sleeve (10) is crimped or retracted to the stagnation on the conduit (12). 5. Device according to any of the preceding claims, characterized in that the second end of the sleeve (10) is crimped or retracted on said funnel (32) at the level of the molded stagnation fitting (16). 6. Device according to any of the preceding claims, characterized in that the conduit (12) is rigid and stagnation with the first end of the sleeve (10) is ensured by a bed of elastically deformable material (18) on the sleeve (10) before mounting thereof on the conduit (12). 7 - Device according to claim 6, characterized in that the bed (18) of the elastically deformable material molded on the first end of the sleeve (10) is adhered on the duct (12). 8. Device according to any of the preceding claims, characterized in that said conduit is a flexible tube (42) based on an elastically formable material such as rubber or an elastomer, where the extremity is lined on a rigid tube (44). ) and ensures stagnation with the first end of the sleeve (10). 9. Device according to any of claims 1 to 3, characterized in that said conduit (12) is rigid and stagnation with the sleeve (10) is ensured after the arrangement of the sleeve on the end of the conduit (12) , by molding at least one elastically deformable material between the first end of the sleeve (10) and the duct (12) and on the internal surface of the second end of the sleeve (10). 10. Device according to any of the preceding claims, characterized in that the sealing material between the first end of the sleeve (10) and the conduit (12) and the stagnation material between the second end of the sleeve (10) and the funnel (32) are different from each other. 1 - Device according to any of the preceding claims, characterized in that the accessory (16) of the second end of the sleeve (10) comprises many annular ribs (36) destined to form successive stagnation lines on said funnel (1). 32).