[0001] The present invention relates to a refrigerated vending machine.
[0002] Refrigerated vending machines are currently widely used commercially which allow
the user to remove the selected product and ensure that such product, while inside
the vending machine, remains in optimum temperature conditions for its preservation.
[0003] In particular, as regards vending machines of the type with trays stacked inside
a refrigeration chamber, the refrigeration devices that are generally used are constituted
by a refrigeration unit, which is arranged below the containment frame and through
which the stream of air intended to be introduced in the refrigeration chamber is
forcedly fed.
[0004] In general, the refrigerated air stream is forcedly fed through a delivery duct,
which is formed at the rear wall of the containment frame. The delivery duct has,
at one of its walls directed toward the refrigeration chamber, a plurality of openings
designed to be crossed by the stream of refrigerated air, so as to allow such stream
to pass through the refrigeration chamber, keeping the products arranged on the trays
at the optimum temperature.
[0005] It is evident that the stream of refrigerated air, after passing through the refrigeration
chamber, strikes the front wall of the containment frame, which is generally made
of glass in order to allow the user to view the products that can be dispensed by
the vending machine.
[0006] Although these refrigeration devices are widely used in vending machines, they are
not devoid of drawbacks.
[0007] First of all, it has in fact been found that the glass pane that constitutes the
front panel, by being struck internally by a stream of air at a temperature that is
significantly lower than the external temperature, is subject to formation of condensation
at its surface that faces the outside of the refrigeration chamber.
[0008] It is evident that this situation entails, in addition to "aesthetic" problems such
as the difficulty for the user to clearly view which products are arranged on the
trays, other disadvantages such as excessive energy consumption.
[0009] Firstly, it is in fact noticed that formation of dew reduces the energy efficiency
of the refrigeration device.
[0010] Secondly, a further increase in energy consumption is caused by the fact that the
refrigerated air stream that strikes the glass pane tends to take off additional heat,
also because the glass pane, despite being insulated, has a high heat exchange coefficient,
which facilitates this phenomenon.
[0011] The aim of the present invention is to eliminate or at least reduce drastically the
drawbacks noted above in known types of refrigerated vending machines.
[0012] Within this aim, another object of the present invention is to provide a refrigerated
vending machine that allows to optimize refrigeration.
[0013] Another object of the present invention is to provide a refrigerated vending machine
that is capable of ensuring that no condensation forms at the external surface of
the glass pane that constitutes the front panel.
[0014] Another object of the invention is to provide a refrigerated vending machine that
allows to differentiate simply and effectively the temperature of various regions
of the refrigeration chamber.
[0015] Another object of the present invention is to provide a refrigerated vending machine
that has a very simple structure, is highly durable, easy to use and competitive in
terms of production cost, so that its use is advantageous also from an economical
standpoint.
[0016] This aim and these and other objects that will become better apparent hereinafter
are achieved by a refrigerated vending machine according to the invention, which comprises
a containment frame provided with a rear closure wall, two side walls and a front
panel that has at least one portion that is at least partially transparent, the containment
frame forming a refrigeration chamber, which is delimited laterally by two lateral
shoulders and inside which there are at least two trays, which are at least partially
superimposed for supporting products to be dispensed, said refrigerated vending machine
being characterized in that it comprises a refrigeration device that comprises, at
one of said lateral shoulders, at least one duct for delivery of refrigerated air
and, at the other lateral shoulder, at least one intake duct, a connecting duct being
provided between said at least one refrigerated air delivery duct and the intake duct
and being provided with air refrigeration means and ventilation means for forcing
the air through said refrigeration means from said intake duct toward said refrigerated
air delivery duct, the refrigerated air delivery duct and the intake duct having respective
portions for fluid connection to the refrigeration chamber, provided, respectively,
with a plurality of delivery openings and intake openings.
[0017] Further characteristics and advantages of the invention will become better apparent
from the description of some preferred but not exclusive embodiments of a refrigerated
vending machine according to the invention, illustrated by way of non-limiting example
in the accompanying drawings, wherein:
Figure 1 is a perspective view of a refrigerated vending machine according to the
invention, in which the front panel is open for the sake of clarity;
Figure 2 is a view that is similar to Figure 1 but taken from another viewpoint;
Figure 3 is a sectional view, taken along a substantially transverse plane, of the
vending machine shown in Figures 1 and 2; and
Figure 4 is a sectional view, similar to Figure 3, in which the refrigeration means
have been omitted for the sake of greater clarity.
[0018] In the examples of embodiments that follow, individual characteristics, given in
relation to specific examples, may actually be interchanged with other different characteristics
that exist in other examples of embodiments.
[0019] Moreover, it is noted that anything found to be already known during the patenting
process is understood not to be claimed and to be the subject of a disclaimer.
[0020] With reference to the figures, a refrigerated vending machine, generally designated
by the reference numeral 1, comprises a containment frame 2, which has a rear closure
wall 3, two side walls 4a and 4b, and a front panel 5.
[0021] Usually, the front panel 5 is provided with at least one at least partially transparent
portion 5a, generally constituted by a glass pane.
[0022] The containment frame 2 defines internally a refrigeration chamber 6, which is formed
laterally by two lateral shoulders 7 and in which there are at least two trays (not
shown in the figures), which lie on a substantially horizontal plane and are superimposed.
[0023] According to the embodiment illustrated in Figures 1 to 3, it is possible for at
least one of the two lateral shoulders 7 to coincide with a side wall (for example
the side wall 4a).
[0024] The trays can be supported slidingly, for example, by vertical posts, but also directly
by the lateral shoulders 7 or by the rear closure wall 3, and are intended to support
the products to be dispensed.
[0025] Conveniently, said trays are associated with conventional movement means (for example
of the spiral type) for the products to be dispensed.
[0026] Generally, the user introduces money or a prepaid key in a control panel and selects
the intended product by entering a corresponding numeric code.
[0027] Following payment and selection, the movement means convey the selected product at
the edge of the tray, which supports the product to be dispensed, so that it is directed
toward the front panel until said product falls inside a collecting pocket, which
is generally arranged below the containment frame 2.
[0028] According to the present invention, the refrigerated vending machine 1 is provided
with a refrigeration device 11, which comprises, at a lateral shoulder 7, at least
one delivery duct for the refrigerated air 12 and, at the other lateral shoulder 7,
at least one intake duct 13.
[0029] A connection duct 14 is provided between the refrigerated air delivery duct or ducts
12 and the intake duct or ducts 13, and is provided with means 15 for refrigerating
the air and with ventilation means 17, which are intended to forcedly feed the air
through the refrigeration means 15 from the intake duct 13 toward the refrigerated
air delivery duct 12.
[0030] Both the refrigerated air delivery duct 12 and the intake duct 13 have a respective
fluid connection portion 12a and 13a, which is designed to provide a fluid connection
between the respective ducts and the refrigeration chamber 6, and respectively have
a plurality of delivery openings 12b and intake openings 13b.
[0031] Conveniently, the side walls 7 are provided with a respective fluid isolation portion
16a and 16b, which is arranged between the front panel 5 (when closed) and the respective
fluid connection portions 12a and 13a.
[0032] Advantageously, the fluid isolation portions 16a and 16b lie along a substantially
vertical direction at least at the region proximate to the front panel 5 that is provided
with the substantially transparent portion 5a.
[0033] In greater detail, the fluid isolation portions 16a and 16b may reach substantially
the edge (directed toward the front panel) of the trays, so that the air stream that
exits from the delivery openings can strike completely the products arranged on the
trays 10.
[0034] With particular reference to the cross-section shown in Figure 4, it can be seen
that between the connection duct 14 and the refrigerated air delivery duct 12 there
is a connection port 20, which advantageously has a fluid passage section that is
larger than the sum of the output sections of the plurality of delivery openings 12b,
so as to ensure, inside the refrigerated air delivery duct 12, a slight overpressure,
such as to allow the air that passes through the delivery openings 12b to have a certain
flow rate along a direction that is substantially perpendicular to the lateral shoulder
7 and therefore parallel to the front panel 5.
[0035] Conveniently, the refrigerated vending machine 1 can comprise means for at least
partially closing at least one of the delivery openings 12b, so as to allow adjustment
of the stream of air that exits from the fluid connection portion 12a. Such closure
means can be provided, for example, by plugs made of an elastic material that are
selectively inserted into the holes. Other closure means may obviously be used, such
as, diaphragms suitable to cover one or more of the holes.
[0036] It is further possible to differentiate, by using said closure means, the density
of the delivery openings in a vertical direction, so as to achieve a variable stream
of refrigerated air along said direction and consequently obtain a thermal gradient
along said direction inside the refrigeration chamber 6.
[0037] By acting on the opening/closure of the delivery openings 12b, it is further possible
to generate a forced thermal gradient region (for example, by closing the delivery
openings 12b arranged in the lower part, it has been found that the coldest region,
for example at 3-4 °C, is obtained at the intermediate trays, the lower trays can
have a temperature of approximately 4-5 °C, and the upper ones can have a temperature
of 10-12 °C).
[0038] Moreover, the closure means can also be used to close at least partially some of
the intake openings 13b.
[0039] Operation of the refrigerated vending machine according to the invention is clearly
evident from what has been described above.
[0040] In particular, when it is necessary to introduce refrigerated air in the refrigeration
chamber, the ventilation means forcedly feed the air stream through the refrigeration
means and, through the connecting port 20, toward the delivery duct.
[0041] Since the connection port 20 has a larger passage section than the sum of the cross-sections
of the plurality of delivery openings 12b, an overpressure is generated inside the
delivery duct 12 and ensures a uniform flow of air through said openings 12b.
[0042] Thanks to this overpressure (and of course thanks to the particular shape of said
delivery openings), the air streams that pass through the delivery openings assuredly
have a direction that is substantially parallel to the front panel, so as to pass
through the entire refrigeration chamber until they are "aspirated" by the intake
openings 13b formed at the other side wall.
[0043] Thanks to the presence of the fluid isolation portions 16a and 16b, the stream of
air that exits from the delivery openings 12b is spaced from the front panel 5, forming
a pocket or curtain or layer of stationary air between the front panel 5 and the edge
of the trays on which the products to be dispensed are arranged.
[0044] This pocket or curtain or layer of stationary air prevents formation of condensation
at the outer surface of the glass pane and also provides the thermal insulation of
said glass pane, with a significant reduction of the energy required to refrigerate
the refrigeration chamber.
[0045] All the characteristics of the invention described above as advantageous, convenient
or the like may also be omitted or be replaced with equivalents.
[0046] The invention thus conceived is susceptible of numerous modifications and variations,
all of which are within the scope of the appended claims.
[0047] In practice, it has been found that the invention has achieved the intended aim and
objects in all its embodiments.
[0048] In particular, it has been found experimentally that thanks to the presence of the
insulation portions between the front panel and the fluid connection portions, a stationary
air pocket is formed between the trays and the internal surface of the front panel.
[0049] This stationary air pocket acts as a heat insulator, preventing first of all the
refrigerated air stream from striking the glass pane and thus preventing formation,
between the internal surface of the glass pane and the external surface, of such a
thermal gradient as to cause condensation.
[0050] Secondly, the delivery openings (and optionally the intake openings as well) can
be more or less densely spaced along the vertical direction, so as to achieve a differentiation
of the temperature of the various trays.
[0051] In practice, the materials used, so long as they are compatible with the contingent
use, as well as the shapes and dimensions, may be any according to requirements.
[0052] All the details may further be replaced with other technically equivalent elements.
[0053] The disclosures in Italian Patent Application No. VR2004A000060 from which this application
claims priority are incorporated herein by reference.
[0054] Where technical features mentioned in any claim are followed by reference signs,
those reference signs have been included for the sole purpose of increasing the intelligibility
of the claims and accordingly such reference signs do not have any limiting effect
on the interpretation of each element identified by way of example by such reference
signs.
1. A refrigerated vending machine, comprising a containment frame (2) that comprises
a rear closure wall (3), two side walls (4a,4b) and a front panel (5) that has at
least one portion (5a) that is at least partially transparent, said containment frame
(2) forming a refrigeration chamber (6), which is delimited laterally by two lateral
shoulders (7) and inside which at least two trays are providable, which are at least
partially superimposed for supporting products to be dispensed, said refrigerated
vending machine being characterized in that it comprises a refrigeration device (11) that comprises, at one of said lateral shoulders
(7), at least one duct (12) for delivery of refrigerated air and, at the other lateral
shoulder (7), at least one intake duct (13), a connecting duct (14) being provided
between said at least one refrigerated air delivery duct (12) and said intake duct
(13) and being provided with air refrigeration means (15) and ventilation means (17)
for forcing the air through said refrigeration means (15) from said intake duct (13)
toward said refrigerated air delivery duct (12), said refrigerated air delivery duct
(12) and said intake duct (13) having respective portions (12a,13a) for fluid connection
to said refrigeration chamber (6), provided respectively with a plurality of delivery
openings (12b) and intake openings (13b).
2. The refrigerated vending machine according to claim 1, characterized in that said lateral shoulders (7) comprise respective fluid isolation portions (16a,16b)
between said front panel (5) and said fluid connection portions (12a,13a).
3. The refrigerated vending machine according to one or more of the preceding claims,
characterized in that said isolation portions (16a,16b) lie along a substantially vertical direction.
4. The refrigerated vending machine according to one or more of the preceding claims,
characterized in that it comprises, between said connection duct (14) and said refrigerated air delivery
duct (12), a connecting port (20), which has a larger passage section than the sum
of the output cross-sections of said plurality of delivery openings (12b).
5. The refrigerated vending machine according to one or more of the preceding claims,
characterized in that it comprises closure means for at least partially closing at least one of said multiple
delivery openings (12b).
6. The refrigerated vending machine according to one or more of the preceding claims,
characterized in that it comprises closure means for at least partially closing at least one of said multiple
intake openings (13b).