Joule-Thomson cooler

Details Joule-Thomson cooler Joule-Thomson cooler

1999-08-27

2001-03-20

McDermott, Corrine (Department: 3744)

Refrigeration

Cryogenic treatment of gas or gas mixture

Liquefaction

Reexamination Certificate

active

06202422

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to Joule-Thomson coolers of the type comprising a low-pressure gas circuit and a high-pressure gas circuit arranged in the low-pressure gas circuit and having an expansion orifice.
BACKGROUND OF THE INVENTION
Joule-Thomson coolers of this type are described, in particular, in documents EP-A-258,093 (L'AIR LIQUIDE), FR-A-2,590,357 (SAT) or EP-A-349,933 (LICENTIA). Although the known devices of this type can be produced in a particularly compact shape, this is generally at the expense of having mediocre thermodynamic performance.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a Joule-Thomson cooler which, for a very low cost of manufacture and in a particularly compact and robust form, is able to offer acceptable and reproducible performance.
To achieve this, according to one characteristic of the invention, the high-pressure gas circuit comprises a first and a second branch, both opening into the expansion orifice and produced in the form of helical spirals of opposite hand nestled together and arranged in a duct which, at least in part, forms the high-pressure circuit.


REFERENCES:
patent: 2455298 (1948-11-01), Cahenzli, Jr.
patent: 2991633 (1961-07-01), Simon
patent: 3048021 (1962-08-01), Coles et al.
patent: 4781033 (1988-11-01), Steyert et al.
patent: 0 349 933 (1990-01-01), None
patent: 2 611 870 (1988-09-01), None
patent: 1168997 (1969-10-01), None
patent: WO 98/26236 (1998-06-01), None

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