Heating – Work chamber having heating means – Having means by which work is progressed or moved mechanically
Patent
1986-10-03
1987-11-24
Yuen, Henry C.
Heating
Work chamber having heating means
Having means by which work is progressed or moved mechanically
432197, 55 85, 55228, 210181, 210182, 16510426, F27B 904, F28D 1500
Patent
active
047086459
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION
The present invention relates to improvements to machines for heating articles or products by condensing vapors on them.
BACKGROUND OF INVENTION
Machines for heating articles or products by condensing vapors on them are known (see for example FR-A-2.243.045, FR-A-2.553.186 and U.S. Pat. No. 4,055,217). In these machines the articles or products are heated to the desired temperature by the condensation of a primary vapor. As the primary liquid constituting the source of the primary vapor is usually a very expensive inert, high boiling point perfluorocarbon liquid, it is customary to confine the primary vapor mass in relation to the atmosphere by means of a secondary vapor mass generated from a secondary liquid, usually a chlorofluorocarbon, having a lower boiling point than the primary liquid. It is also known to provide means for condensing the secondary vapor, in order to prevent it from escaping to the atmosphere, and for recycling the primary vapor condensate to the machine. It is also known to separate the secondary liquid from the water originating from the atmosphere and contained in the condensate by eliminating the supernatant water in a separator (see for example U.S. Pat. No. 3,632,480 and EP-A-0112.484).
SUMMARY OF INVENTION
The invention seeks to provide various improvements to the type of machine described above.
The aim of a first improvement is to lower the content of chlorine and fluorine ions in the primary and secondary vapors in the equipment which result from the decomposition of these vapors. To this end the invention provides improved scrubbing of the secondary liquid. Moreover, a current of dry gas interposed between the humid atmospheric air and the secondary vapor combats the introduction of atmospheric humidity.
Another improvement consists in automatically compensating for variations of operating conditions by controlling the power balance.
These improvements will be described below in greater detail with reference to the accompanying drawing, which is given by way of example.
DRAWING AND DETAILED DESCRIPTION OF PREFERRED EMBODIMENT
FIG. 1 shows schematically an improved machine, while
FIG. 2 is a detailed section of the acid scrubber shown on the right in FIG. 1.
FIG. 1 shows schematically one example of a machine to which the improvements according to the invention can be applied.
This machine comprises a vertical tank 1, for example of rectangular section, comprising, from bottom to top, primary liquid 2 (usually a liquid perfluorocarbon) which can be brought to boiling point by one or more heating elements 3 and/or equivalent means (heating bath), a chamber 4 for heating the article or product which is to be heated, said chamber being filled, when in operation, with primary liquid vapor; a thermostatically controlled coil 5 for condensing primary liquid vapor and held at a temperature intermediate between the boiling points of the primary and secondary liquids; a zone 6 filled with a vapor mass of a secondary liquid (usually a chlorofluorocarbon) having a boiling point lower than that of the primary liquid, said vapor mass forming a stopper for the primary liquid vapor; a cooled coil 7 for condensing secondary liquid vapor. The secondary vapor may be generated by injecting secondary liquid with the aid of a row of atomizers 8, as shown, connected to a secondary liquid tank. As an alternative the secondary liquid could simply be mixed with the primary liquid 2.
The secondary liquid condensed on the coil 7 is collected in a gutter 9 and passed to the purifier shown in FIG. 2, which constitutes one of the improvements according to the invention. After purification the secondary liquid serves to feed the row of atomizers 8 (or is returned to the bottom of the tank in the case of the alternative mentioned).
A more detailed description will now be given of the various improvements provided by the present invention.
I--LOWERING OF IONIC CHLORINE AND FLUORINE CONTENTS IN THE MACHINE
Because of a thermal degradation process, H.sup.+, Cl.sup.-, and F.sup
REFERENCES:
patent: 2477318 (1949-07-01), Stevenson
patent: 3487015 (1969-12-01), Buester
patent: 4055217 (1977-10-01), Chu et al.
patent: 4321031 (1982-03-01), Woodgate
patent: 4353715 (1982-10-01), Mir et al.
patent: 4431608 (1984-02-01), Katagiri et al.
Boumendil Jean-Jack
Pescatore Richard
Breiner A. W.
Piezo-Ceram Electronique
Yuen Henry C.
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