US1975416A - Sterilizer for milk and other liquids - Google Patents

Description

Oct. 2, 1934. M. A. I. DE SOUZA STERILIZER FOR MILK AND OTHER LIQUIDS Filed April 25, 1932 En enfir. 77 411762501121 Patented Oct. 2, 1934 STERILIZER FOE BULK AND OTHER LIQUIDS Marcos Antonio Inglez de Souza, Rio de Janeiro, Brazil Application April 25, 1932, Serial No. 607,430

1 Claim.

The improvements consist in the use of materials which are bad conductors of heat, for the manufacture of the apparatus, and also in the adaptation and conjugation of electrical resistances to thermic flask or recipients in order that a higher thermic energy be obtained with a mini mum of cost and unequalled hygienic results.

The property of thermos flask to retain heat for a long period of time is well known, nevertheless, this property has not, as yet, had the desired and expected manifold applications, not only due to the many difliculties in their manufacture, but also, and principally, because of their high cost. Were it not for a few domestic uses, their application is as yet very restricted.

Electric energy for the production of heat has not been very extensively made use of up to now because, being very expensive, it cannot be undertaken by manufacturers as a business proposition, because they desire to save cost of production and, for that reason, desist from its application despite the many advantages it may present.

The use of bad heat conductors in devices which are to be subject to heat has also not been recommended by reason of the very nature of the purposes for which they are intended.

No one, however, up to this day, has thought of the possibility or possibilities of the congregation of these two elements for the purpose of ob taining a practical industrial result. Nor has any one ever thought of the possibility, in certain cases, of taking advantage of the transmission of electric thermic energy by conjugating it through a thermos flask, to render it more economic than others, because acting in direct contact with the liquid to be sterilized in a recipient which is a bad conductor of heat, it reduces its consumption to a minimum, besides having other advantages which result therefrom and which shall be considered hereinafter.

No one has ever thought of the complementary service that, in such a case, may be rendered by the thermic recipient or flask, by eliminating, for a considerable length of time, the need of a greater addition of thermic energy, and compensating its initial high cost because of its negligible subsequent cost, by reason of the same recipient or flask being used for a double purpose, without further interference or work with a minimum cost of adaptation.

The consumption of electric energy or kw., although high at the outset, is negligible once the desired temperature has been reached, it being possible to automatically commutate such temperature, as may be desired, or even to intensify it within a few seconds without further cost or work, except that of reconnecting the current, which is not to be found other systems which require a constant consumption of energy and uninterrupted vigilance.

The points of entry of the thermic energy in direct contact with the product being reduced to one or several small openings and, for that reason, almost eliminating contact with any external surface of the apparatus, render the application of the thermic flask or recipient absolutely advisable and recommendable for that special purpose, a fact which does not occur in any other heating system, the application of which, in such a case, would be of very little advantage.

The advantage of the use of the thermic flask or recipient as a sterilizer is of further importance and worthy of greater notice in view of the fact that, preferably, for the manufacture of the sterilizing recipient, any material may be used which is not a good conductor of heat, such as porcelain, glass or others, contrary to all other known sterilizers in the manufacture of which only good conductors of heat are employed, and, furthermore, permitting the substitution of copper for other metals less subject to the dangerous oxidation of the latter.

In the accompanying drawing one embodiment of the invention is illustrated, wherein Fig. l is a top plan view of the flask and Fig. 2 is a vertical section.

The sterilizer that I have invented consists of the following main parts:

A thermic flask or recipient, (12) moulded in one or more pieces, according to its size, and is made from any suitable material, which is preferably not a good heat conductor. The flask has double walls comprising an inner wall 30 lined on Q the outer surface with a layer of heat insulating material 31 which is, in turn, protected by an outer cover or jacket 32 of aluminium or other metal, according to the installations and the purposes in view. The internal wall 36 of the flask or recipient, being air-proof, gives it its thermic qualities or properties. End covers 37, 3S similarly constructed are also provided.

This flask or recipient is provided with one or. more electric resistances, (26) located either in the body of the flask or recipient or in its lid or bottom.

The flask or recipient is provided with a thermostat (27), to commutate, automatically if so desired, the current of thermic energy.

The said flask or recipient is also provided with a point of entry 3 for the charge which, after receiving the liquid to be sterilized, projects it against its internal walls by means of a spout 33, so that any quantity of liquid therein contained will be completely mixed with the quantity added to it and then flows back to the surface. A pres sure manometer is adapted to the apparatus, also a load and level manometer, 34) and at the point of entry of the load a device which permits it to be charged under pressure, so that the sterili- Zation, carried out in this manner, does not bring about or cause loss of carbonic gas.

An exit (35) is furnished which may also be supplied with a siphon, so as to permit the conneetion of one or more therinic recipients or flasks to said sterilizer, also in series, so that, with only one apparatus, a greater quantity of milk or of any other liquid may be sterilized with great economy and speed. An agitating device (36), is also shown.

I claim:

A sterilizing apparatus for milk and other liquids, consisting in the combination of an electric heating device witha thermic recipient in the form of a double walled flask filled with insulating material in the space formed between the walls, a filling spout for said liquid in the upper end of the flask adapted to deliver the liquid against the inner surface of said flask, means for agitating the liquid in the flask, said heating device comprising electric resistances supported in the walls of the flask and projecting inwardly in order to directly contact with the liquid.

. MARCOS ANTONIO INGLEZ DE SOUZA.

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