Make Ice Cream At Home,when U R Free
It is the object of the present invention to improve a commercial ice maker in such a manner that
, while making it possible to obtain faultless pasteurization of the ice- cream mix, changes in the flavour of the ice- cream mix as a consequence of over-heating or of excessively prolonged heating are obviated.
According to the present invention, there is provided an ice- cream maker, including a freezing tank provided with a heating system for pasteurizing its contents, and a storage container for ice- cream mix which can be cooled and heated and which is connected via at least one supply line to the freezing tank, wherein at least the storage container is arranged in a heating and cooling chamber adapted to be heated and cooled.
The measures according to the invention cause heat to be transferred particularly well over a large area so that the ice- cream mix is heated relatively rapidly. The measures according to the invention also enable an exceptionally even temperature distribution to take place so that no local overheating occurs. The result of this is exceptionally rapid and even pasteurization, and no significant deterioration in the flavor of the ice- cream.
A particularly simple solution of the heating, on the one hand, and of the cooling, on the other hand, in the heating and cooling chamber is obtained if a heating and a cooling unit is provided in the heating and cooling chamber. The above-mentioned transfer of heat in a particularly even manner and over a large area may be improved if an air circulating unit is provided in the heating and cooling chamber. Since the heat transfer during heating, on the one hand, and during cooling, on the other hand, takes place primarily by convection; an air circulating unit brings considerable advantages.
If, the
gelato freezers are arranged wholly in the heating and cooling chamber, the same advantages also apply to the freezing tank. If it is arranged only partially, for example, with its inlet chamber, only, in the heating and cooling chamber, a separate heater must be provided also at the freezing tank for pastuerization purposes. However, since it is only used for heating the contents of the freezing tank, heating can take place at a lower temperature level so that here, too, changes in the flavour of the ice- cream mix are obviated.
The storage container may be arranged in the heating and cooling chamber in a releaseable and interchangeable manner and in this case, is preferably connected to the freezing tank by flexible lines.
The storage container may be connected to the freezing tank via a forward-flow line and a return flow line and via at least one interposed supply pump. In this case, it is not necessary to pump the ice- cream mix first into the freezing tank and to draw it off again via the return-flow line; the short circuit can also be installed directly at the point of entry of the forward-flow line into the freezing tank since with this arrangement, of course, the lines run through the heating and cooling chamber and the ice- cream mix present in these chambers is thus heated and cooled directly.
In order to improve the heat transfer in the storage container on its inside, means may be provided in the storage container for causing the ice- cream mix returned to the container walls to form a film thereon. The means may comprise a distributing disc leading to the inside of the container walls.
The heat transfer on the outside of the storage containers is improved still further if a heating and cooling unit is provided inside the heating and cooling chamber.
FIG. 1 shows a first, exemplary embodiment of
home ice cream makers according to the present invention, in vertical cross-section;
FIG. 2 is a partial, vertical, cross-sectional view of a second exemplary embodiment of an ice- cream maker according to the invention, the section being taken along section line II--II of FIG. 3; and
FIG. 3 is a partial, vertical, cross-sectional view of the modified ice- cream maker of FIG. 2, the section being taken along section line III--III of FIG. 2.
In the embodiment according to FIG. 1, there is shown
MEHEN ice cream makers for supplying portions of ice- cream having a housing 1 of a box-like shape. A heating and cooling chamber 2 which is surrounded by a thick wall of heat insulation 3 is arranged in the housing. The heating and cooling chamber 2 is used for accommodating one (or several) transportable storage containers 4 for an ice- cream mix with an air space around the containers. In the vicinity of a floor 5 of the storage container 4, it has an outlet 6 which can be closed by a shut-off valve 7. The outlet 6 is located at the lowest point of the storage container 4 so that it is possible to empty it completely. This is very easily possible by arranging the floor 5 in an appropriately inclined manner or by arranging the whole storage container 4 to be inclined. In addition, the floor 5 of the storage container 4 is resting freely on small supports 8 so that the floor 5, too, can have air circulating freely beneath it.
As a rule, the top of the cylindrically constructed storage container 4 is closed tightly by a cover 9. In the cover 9, a vent valve 10 is located. The cover 9 also contains a coupling 11 for connecting a compressed air line 12 to the container 4. In addition, approximately in the center of the cover 9, a further coupling 13 is located for connecting a flexible return-flow line 14 for ice- cream mix to the container. On the inside of the cover 9, a return-flow connecting tube 15 is joined to this further coupling 13 and ends a little above a distributing disc 17 which is curved so as to be inclined with respect to the walls 16 of the storage container 4.
The ice- cream mix is fed from the outlet 6' in the floor 5' of the storage container 4' to the inlet chamber 34 via a refilling line 48 which opens into the inlet chamber below its top so that in this way, too, the ice- cream level in the inlet chamber, and thus in the freezing tank 24, is controlled in the usual known manner. Since in this embodiment no supply pump and no corresponding repumping of the ice- cream mix is provided for, in the storage container 4' an agitator 49 is provided which can be driven from the outside, via a conventional pulley 50 by a drive system, not shown.The ice- cream mix is fed from the outlet 6' in the floor 5' of the storage container 4' to the inlet chamber 34 via a refilling line 48 which opens into the inlet chamber below its top so that in this way, too, the ice- cream level in the inlet chamber, and thus in the
MEHEN batch freezers 24, is controlled in the usual known manner. Since in this embodiment no supply pump and no corresponding repumping of the ice- cream mix is provided for, in the storage container 4' an agitator 49 is provided which can be driven from the outside, via a conventional pulley 50 by a drive system, not shown.
from:freepatentsonline
by: wenjun
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