Pipe joints or couplings – With heating or cooling
Patent
1995-01-03
1996-08-06
Nicholson, Eric K.
Pipe joints or couplings
With heating or cooling
123568, 285215, F16L 4700, F02M 2507
Patent
active
055427111
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device for fitting a hot element to a hollow body including at least one cold fluid inlet pipe and at least one fluid outlet pipe, said hollow body being made of a thermoplastic which cannot withstand the temperature of the hot element.
The present invention also relates to a hollow body made of thermoplastic including such a device for fitting a hot element, the temperature of which said thermoplastic cannot withstand, onto said hollow body.
It is known that hollow bodies made of thermoplastic are used in increasingly numerous and varied technical fields. Indeed, these hollow bodies are generally simple and economical to manufacture and may have a certain predetermined mechanical strength. The available manufacturing techniques make it possible to produce bodies of complicated shapes. These bodies are furthermore lightweight and have beneficial electrical, thermal and acoustic insulation properties. They are thus increasingly competing with hollow bodies made of lightweight alloy, which are markedly more expensive.
In contrast, it is known that these hollow bodies have a significant limitation as regards the temperature to which they may be subjected, especially pointwise, without losing their mechanical properties.
It is generally believed that fitting a hot element to a hollow body made of thermoplastic, the temperature of which said thermoplastic cannot withstand, would require solutions the cost of which would outweigh the economic advantage of the use of thermoplastic relative to the production of the same hollow body in lightweight alloy. Furthermore, possible users would fear a lack of reliability in the use of such a fitting.
EP-A-0,486,338 makes known an exhaust gas recirculation device for an internal combustion engine of the type comprising a pipe for recirculating gases from the exhaust manifold to the intake manifold. The latter is made of a composite material. The end part of the recirculation pipe connected to the intake manifold emerging in it comprises a double wall defining an annular chamber which thermally insulates the wall of the intake manifold from the internal wall of the end part.
The end part emerges downstream of the flap for letting air into the intake manifold, close to it, and the annular chamber is in fluid communication on the one hand with the intake manifold and, on the other hand, with an air circuit for setting the idle speed of the engine so that the idle air flowing through the annular chamber cools the wall of the intake manifold in contact with the external wall of the end part.
The device is of relatively complicated and costly structure. Furthermore, the flow rate of air for setting the idle speed is substantially constant regardless of the speed/load conditions of the engine, and can barely vary as a function of the flow rate of recirculated exhaust gas.
The object of the present invention is to overcome the abovementioned drawbacks, and to provide a device of the abovementioned type which is of simple and economical structure and easy to use while being extremely reliable.
The device according to the invention is thus a device for fitting a hot element to a hollow body including at least one cold fluid inlet pipe and at least one fluid outlet pipe, said hollow body being made of a thermoplastic which cannot withstand the temperature of the hot element, the device including an inlet adapter which surrounds said hot element, which is fixed to the hollow body and emerges in it through an opening, and which is also produced from a thermoplastic, retaining means for keeping the hot element inside the inlet adapter, out of contact with it, sealing means located between the outer peripheral surface of the hot element and the inner peripheral surface of the adapter, and means for cooling the space lying between the adapter and the hot element.
According to the invention, this device is one wherein the inlet adapter is separated from the cold fluid inlet pipe, and wherein the device further includes means for sending some of the cold f
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patent: 4960096 (1990-10-01), Sukimoto et al.
patent: 5201549 (1993-04-01), Davey
patent: 5207714 (1993-05-01), Hayashi et al.
patent: 5333917 (1994-08-01), Davey et al.
patent: 5425347 (1995-06-01), Zinke, II
Nicholson Eric K.
Orbey Plastiques and Industries
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