The present invention relates to a refrigeration appliance , more particularly to a door cooling system for forced air flow refrigerators.
The object of the present invention to provide an improved cooling system for cooling the door bin area of the refrigeartor and to make available the extra cool beverages to the consumer without any risk of accident or damage to the refrigeration appliance.
In a typical domestic refrigeration appliance, the appliance often has two separate compartments which are maintained at different temperature. For example there is a freezer compartment which has a temperature maintained below 0°C and a fresh food compartment which is maintained at a temperature above 0°C.
In a conventional refrigeration appliances, the currents of cool and warm air keep the temperature of the fresh food compartment at predefined temperature with the result the beverages kept in the door portion do not have the desired temperature as the which should be cooler then the fresh food most of the times. As and when the need arises the beverages need to be kept in the freezer compartment for sometime before use. The beverages are relished generally at the extra cooled temperature by the consumer, if not chilled. The bottles and containers if left unattended in the freezer compartment after a certain period may burst resulting into an accident or cause damage to the appliance.
U.S. Patent No. US 558419 describes a refrigerator for maintaining a homogeneity of cool air distribution in a cold storage compartment. However the bin area does not have the temperature as that of the freezer. To overcome the problems explained above an effective system has been developed.
The present invention facilitates the consumer to have extra cool beverages while maintaining the same compressor and evaporator.
In the subject invention a cooling duct is fitted into one of the shelf of the refrigerator which has spouts for flow of cool air to the bin area of the door where the beverages are kept.
Moreover the fresh food or vegetables kept in the lower tray are also kept at the lower temperature compared to the other refrigerators where the fresh food compartment has slightly higher temperature.
The embodiment of the invention resides in that the cool air duct comprising mainly of air cooling pipe having slots at both ends. The air cooling pipe is covered with a holllow cylindrical duct cover preferrablly of plastic having spouts at the bottom for venting cool air straight into the bin area of the door.
Another embodiment of the invention is that spouts are provided in the said cylindrical ducts at the bottom for flow of the cool air.
Other embodiment of the invention is that the said air distribution pipe is fitted into the cylindrical duct concentrically such that the spouts of the said ducts are horizontally aligned with the slots of the said air distribution pipe.
Other embodiment of the invention is that a nozzle is provided at one of the end point of the air distribution pipe.
Other embodiment of the invention is that air control knob is provided at the nozzle end of the said duct to control the flow and pressure of the cooled air.
Other embodiment of the invention is that a butterfly valve is provided at the nozzle end slot.
Accordingly the present invention relates to a cooling device for
cooling the door bin comprising a tray, a pair of hollow cylindrical
ducts having inner projected ends snugly fitted into each other to
form an airtight joint attached to the said tray characterized in
that the cooling door is provided with a hollow cylindrical air
distribution pipe having two slots near its end points, an end plug
provided at one of the ends of the said air distribution pipe,
means for connecting the said air distribution pipe to the cooling
system of the said refrigerator; means for controlling the flow of
cool air from the cooling system to the said air distribution pipe;
means provided in the said cylindrical duct to allow the flow of
cool air to the bin area of the said refrigerator, spouts provided
at the bottom horizontally aligned with the slots of the air
distribution pipe exhausting the air from the front of the shelf
onto the door bin.
The subject application may better be understood with reference to
the accompanying drawings which are for illustrative purposes and
the same should not be construed to restrict the scope of the
invention.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
Figure 1 is a schematic diagram of the conventional refrigerator to
describe the flow of air on the two compartments.
Figure 2 is the sectional view to describe the position of the duct
in the refrigerator.
Figure 3 is the schematic diagram refrigerator to describe the flow
of the air in the present invention.
Figure 4 is the exploded view of the shelf.
Figure 5 is the assembled shelf.
Figure 6 is fixing the frontal duct.
Figure 7 is diagram showing exhaust of cold air.
DETAILED DESCRIPTION OF THE INVENTION
Fig. 1 describes the flow of the cool air in the conventional refrigeration appliance. In order to maintain the two compartments at the desired temperature cooling device is provided in all the refrigerators. An appropriate air moving device such as motor driven fan or blower is provided as needed for circulating cool air from each of the compartments over evaporator to maintain a fairly consistent temperature throughout each compartment. A thermostat is provided for each compartment to provide appropriate signal inputs to control for the appliance.
As shown in Fig. 3 the present cool air supply apparatus consists of a cool air distribution pipe (5) having two slots (19) provided near its end points. The said air distribution pipe (15) is closed at one end by the end plug (18) and a butterfly valve (17) is inserted into the said air distribution pipe (5). First the shelf (9) is attached with the left duct cover (10) overlapped by the right ductcover (7) to provide an airtight joint as shown in Fig. 6. The air distribution pipe (5) is inserted into the duct cover (16) and one of its end is fitted into the nozzle (14) which in line of the rib for resting the shelf. The air control knob (15) is fitted at the nozzle end slot of the air distribution pipe (5).
Fig. 4 shows the exploded view of the shelf and Fig. 5 is the assembled view of the shelf. Fig. 6 shows the fixing of the frontal cooling duct and Fig. 7 is the diagram showing how cold air is exhausted through spouts flowing from the cooling system of the refrigerator.
Reference to fig, 3, 4, 5 and 6 thereto illustrated to cooling method of the cooling apparatus in accordance with the present invention.
Firstly, the cool air generated in the refrigeration appliance by the compressor is circulated by fan or blower in freezer compartment (11) through the air inlet (1) . The cool air blows through air separator (2) and is circulated through the air supply pipe (3). The cool air is taken through the air supply pipe to the duct through a the nozzle (14) which is in line of the rib for resting the shelf. The supply quantity of cool air being introduced in the pipe is controlled by a sensor. The cool air moves from nozzle in the cool air duct (17) which has spouts (15) at the bottom side concentrically aligned with the slots of the air distribution pipe(5) The cool air is exhausted from the front of the shelf on to the beverages in the door bin (13) through the spouts(15) thus lowering the temperature of the desired area of the fresh food compartment.
Though the invention has been described in conjunction with specific embodiments having alteration and valuation will be apart to those skilled in the art in light of the foregoing description. Accordingly the invention is intended to embrace all the alternatives and variation that fall within the spirit and scope of the appended claims.

WE CLAIM:-
1. A cooling device for cooling the door bin comprising a tray,
a pair of hollow cylindrical ducts having inner projected ends
snugly fitted into each other to form an airtight joint attached
to the said tray characterized in that the cooling door is
provided with a hollow cylindrical air distribution pipe having
two slots near its end points, an end plug provided at one of
the ends of the said air distribution pipe, means for connecting
the said air distribution pipe to the cooling system of the said
refrigerator; means for controlling the flow of cool air from the
cooling system to the said air distribution pipe; means provided
in the said cylindrical duct to allow the flow of cool air to the
bin area of the said refrigerator, spouts provided at the bottom
horizontally aligned with the slots of the air distribution pipe
exhausting the air from the front of the shelf onto the door
bin.
2. A cooling device as claimed in claim 1 wherein the said
cylindrical ducts are made of plastics.
3 . A cooling device as claimed in claim 1 wherein the said means for controlling the flow of cool air from the cooling system to the air distribution pipe is a nozzle provided at one of the end point of the air distribution pipe.
4. A cooling device as claimed in claim 1 wherein the said means to allow the flow cool air to the bins area of the refrigerator is an air control knob provided at the nozzle end of the said duct to control the flow and pressure of the cooled air.

5. A cooling device as claimed in claim 1 wherein a butterfly
valve is provided at the nozzle end slot.
6. A cooling device substantially as hereinbefore described
with reference to the accompanying drawings.