Multi-zone low temperature freezer

A freezer provides multiple zones of temperature for preserving a frozen product at an ultra-low temperature. At least one first housing provides a first interior space at a first predetermined temperature. A first compressor, condenser and metering device supply a first refrigerant to a first evaporator for lowering the temperature in the first interior space to the first predetermined temperature. At least one second housing is mounted totally within the first interior space and provides a second interior space for defining a second freezing zone at a second predetermined temperature. The second predetermined temperature is lower relative to the first predetermined temperature. A second compressor, condenser and metering device supply a second refrigerant to a second evaporator for freezing the second housing to the second predetermined temperature. The second compressor, condenser and metering device are disposed within the first interior space to the first evaporator.

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Description
CLAIM FOR PRIORITY

The present application claims priority of U.S. Provisional Patent Application No. 60/892,812 filed on Mar. 2, 2007.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to providing a freezer for maintaining a product at an ultra-low temperature wherein at least one first housing is maintained at a first predetermined temperature and at least one second housing disposed within said at least one first housing is maintained at a second ultra-low predetermined temperature relative to the first predetermined temperature of the at least one first housing.

2. Description of Background Art

In the freezing industry, a product can be preserved for a very long time if the product is stored at an ultra-low temperature in the range of approximately −40 to −70 degrees Fahrenheit, −40 to −56.7 Celsius. The colder you store the product the longer the product can be preserved.

Heretofore, to obtain such an ultra-low temperature for storing a product, such as a food product, medical samples or other substances that are desired to be stored, it was necessary to construct a special freezing unit with a cascaded or multiple stage compressor, condenser and evaporation mechanism designed to achieve the desired ultra-low temperature. To construct such a special freezing unit is very expensive and not economically viable for home use or for use in an environment wherein an ultra-low temperature freezer would only be used on the occasional basis.

SUMMARY AND OBJECTS OF THE INVENTION

It is an object of an embodiment of the present invention, to provide an ultra-low temperature freezer for providing multiple zones of temperature for achieving the ultra-low temperature. At least one first housing provides a first interior space for defining a first zone that is maintained at a first predetermined temperature. A first compressor is operatively connected to a first condenser and a first metering device for supplying a first refrigerant to a first evaporator disposed within said first interior space for cooling the first interior space to the first predetermined temperature. At least one second housing is mounted totally within the first interior space. The at least one second housing provides a second interior space for defining a second freezing zone at a second predetermined temperature. The second predetermined temperature is lower relative to the first predetermined temperature. A second compressor is operatively connected to a second condenser and a second metering device for supplying a second refrigerant to a second evaporator disposed within the at least one second housing for freezing the at least one second housing to the second predetermined temperature. The second compressor, the second condenser and the second metering device are disposed within the first interior space and are exposed to the first evaporator. The first predetermined temperature within the first interior space provides a working environmental temperature relative to the second predetermined temperature that is the ultra-low temperature that is not suitable as a working environment.

In an embodiment of the present invention, the freezer disposed within the at least one second housing is a freezer that is completely disposed within the first interior space. The freezer is operated with the second compressor, the second condenser and the second metering device being exposed to the first zone wherein the freezer is enabled to reduce the temperature within the second freezing zone to be the ultra-low temperature relative to the first predetermined temperature within the first zone.

In an embodiment of the present invention, the first predetermined temperature is in a range of approximately −20 to +40 degrees Fahrenheit, −28.9 to +4.4 Celsius and the second predetermined temperature in a range of approximately −40 to −70 degrees Fahrenheit, −40 to −56.7 Celsius.

In an embodiment of the present invention, the at least one first housing is a walk-in housing and the at least one second housing is disposed within the walk-in housing to enable a working environmental temperature within the at least one first housing while maintaining the at least one second housing at the ultra-low temperature.

In an embodiment of the present invention, a number of second housings are disposed within the first housing wherein an individual can work in the relatively warmer environment of the first housing.

In an embodiment of the present invention, a at least one first housing is a walk-in housing that is maintained at a low temperature and the at least one second housing is disposed within the walk-in housing and is maintained at an ultra-low temperature.

In an embodiment of the present invention, a first thermostat for regulating the first predetermined temperature is disposed within the at least one first housing wherein the first thermostat regulates the temperature to be in a range of approximately −20 to +40 degrees Fahrenheit, −28.9 to +4.4 Celsius.

In an embodiment of the present invention, a second thermostat for regulating the second predetermined temperature is disposed within the at least one second housing wherein the second thermostat regulates the temperature to be in a range of approximately −40 to −70 degrees Fahrenheit, −40 to −56.7 Celsius.

In an embodiment of the present invention, an atmosphere within the first interior space, that is at a first predetermined temperature, is the medium for cascading the second predetermined temperature within the second interior space to be an ultra-low freezing temperature.

In an embodiment of the present invention, a freezer is provided with two zones of temperature for preserving a frozen product at an ultra-low temperature. At least one first housing provides a first interior space for defining a first refrigerated zone at a first predetermined temperature. A first compressor is operatively connected to a first condenser and a first metering device for supplying a first refrigerant to a first evaporator disposed within the first interior space for cooling the first interior space to the first predetermined temperature. At least one second housing is mounted totally within the first interior space. The at least one second housing provides a second interior space for defining a second freezing zone at a second predetermined temperature, the second predetermined temperature is lower relative to the first predetermined temperature. A second compressor is operatively connected to a second condenser and a second metering device for supplying a second refrigerant to a second evaporator disposed within the second housing for freezing the second housing to the second predetermined temperature. The second compressor, the second condenser and the second metering device are disposed within the first interior space and are exposed to the first evaporator.

In an embodiment of the present invention, the at least one second housing is a freezer that is completely disposed within the first interior space, the freezer is operated with the second compressor, the second condenser and the second metering device being exposed to the first zone wherein the freezer reduces the temperature within the second freezing zone to be the ultra-low temperature relative to the first predetermined temperature within said first zone.

In an embodiment of the present invention, individuals may work within the at least one first housing which may be a larger walk-in cooler environment at approximately −20 to +40 degrees Fahrenheit, −28.9 to +4.4 Celsius while a frozen product such as food, medical samples or another desirable substances may be stored at an ultra-low temperature, as low as approximately −40 to −70 degrees Fahrenheit, −40 to −56.7 Celsius by utilization of a freezer to freeze the product for extended periods of time. By utilizing a freezer unit within a cold temperature environment of approximately −20 to +40 Fahrenheit, −28.9 to +4.4 Celsius, the normal or standard freezer unit can achieve an ultra-low temperature of as low as −40 to −70 degrees Fahrenheit, −40 to −56.7 degrees Celsius in order to preserve any desired product for an extended period of time, i.e. a decade or more, within a relatively comfortable working exterior environment of approximately −20 to +40 Fahrenheit, −28.9 to +4.4 Celsius.

In another embodiment of the present invention, multiple zones of temperature may be utilized. At least one first housing may be maintained at a first predetermined temperature with at least one second housing maintained at a second predetermined temperature and being disposed within the at least one first housing. At least one third housing may be maintained at a third predetermined temperature with the at least one third housing being disposed within the at least one second housing. The at least one second housing is operated with the second compressor, the second condenser and the second metering device being exposed to the first zone wherein the second housing reduces the temperature within the second freezing zone to be a low temperature relative to the first predetermined temperature within the first zone. The at least one third housing is operated with a third compressor, a third condenser and a third metering device being exposed to the second freezing zone wherein the at least one third housing reduces the temperature within the third freezing zone to be the ultra-low temperature relative to the second predetermined temperature within the second freezing zone.

Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein:

FIG. 1 is perspective view illustrating a first housing for positioning a plurality of freezer units within said first housing that forms a working environment for an individual to gain access to a product that is frozen at an ultra-low temperature within said freezer units;

FIG. 2 is a perspective view of a first housing with a second housing disposed within said first housing wherein the second housing maintains a frozen product at an ultra-low temperature;

FIG. 3 is a schematic view of a compressor, condensor and metering device of the second housing that is positioned within the evaporator of the first housing; and

FIG. 4 is a perspective view of a first housing, a second housing and a third housing with the third housing being disposed within the second housing and the second housing being disposed within the first housing.

 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

As illustrated in FIG. 1, a low temperature enclosure 10 provides two zones of temperature for preserving a product at a low and ultra-low temperature. At least one first housing 11 is provides a first interior space 12 for defining a first zone that is maintained at a first predetermined temperature. The at least one first housing 11 includes a door 16 for permitting an individual to gain ingress and egress to the first interior space 12. A first compressor 22 is operatively connected to a first condenser 24 and a first metering device 26 for supplying a first refrigerant to a first evaporator 28 disposed within said first interior space 12 for cooling the first interior space 12 to the first predetermined temperature. The following example illustrates three housing within the low temperature enclosure 10. It is understood that any number of housings may be positioned within the low temperature enclosure 10. The present invention is not limited to positioning only three housings within the low temperature enclosure 10.

At least one second housing 31 is mounted totally within said first interior space 12. The at least one second housing 31 provides a second interior space for defining a second freezing zone at a second predetermined temperature. The second predetermined temperature is lower relative to the first predetermined temperature.

A second compressor 32 is operatively connected to a second condenser 34 and a second metering device 36 for supplying a second refrigerant to a second evaporator 38 disposed within the at least one second housing 31 for freezing the at least one second housing 31 to the second predetermined temperature. The second compressor 32, the second condenser 34 and said second metering device 36 are disposed within the first interior space 12 and are exposed to the first evaporator 28.

At least one third housing 41 is mounted totally within said first interior space 12. The at least one third housing 41 provides a third interior space for defining a third freezing zone at a predetermined temperature. The predetermined temperature is lower relative to the first predetermined temperature.

A third compressor 42 is operatively connected to a third condenser 44 and a third metering device 46 for supplying a third refrigerant to a third evaporator 48 disposed within the at least one third housing 41 for freezing the at least one third housing 41 to the predetermined temperature. The third compressor 42, the third condenser 44 and said third metering device 46 are disposed within the first interior space 12 and are exposed to the first evaporator 28.

At least one fourth housing 51 is mounted totally within said first interior space 12. The at least one fourth housing 51 provides a fourth interior space for defining a fourth freezing zone at a predetermined temperature. The predetermined temperature is lower relative to the first predetermined temperature.

A fourth compressor 52 is operatively connected to a fourth condenser 54 and a fourth metering device 56 for supplying a fourth refrigerant to a fourth evaporator 58 disposed within the at least one fourth housing 51 for freezing the at least one fourth housing 51 to the predetermined temperature. The fourth compressor 52, the fourth condenser 54 and said fourth metering device 56 are disposed within the first interior space 12 and are exposed to the first evaporator 28.

The first predetermined temperature within the first interior space 12 provides a working environmental temperature so that an individual may enter the first interior space 12 through the door 16 to work. The working environmental temperature is at a higher temperature relative to the predetermined temperature within the second, third and fourth housings 31, 41 and 51 which are all at the ultra-low temperature that is not suitable as a working environment.

With respect to the housing 10, the at least one second, third and fourth housings 31, 41 and 51 may be freezers that are completely disposed within the first interior space 14. The freezers are operated with the compressors, the condensers and the metering devices that are exposed to the first zone within the first interior space 12 wherein the freezers are enabled to reduce the temperature within the freezing zones within the at least one second, third and fourth housings 31, 41 and 51 to be the ultra-low temperature relative to said first predetermined temperature within the first zone.

The housing 10 may include a first predetermined temperature in the first interior space 12 that is in a range of approximately −20 to +40 degrees Fahrenheit, −28.9 to +4.4 Celsius. The predetermined temperature in the second, third and fourth housings 31, 41 and 51 may be in a range of approximately −40 to −70 degrees Fahrenheit, −40 to −56.7 Celsius.

The housing 10 may include a first thermostat 61 for controlling the first compressor 22, the first condenser 24 and first metering device 26 to regulate the first predetermined temperature within the first housing 12 to be in a range of approximately −20 to +40 degrees Fahrenheit, −28.9 to +4.4 Celsius.

In addition, the at least one second housing 31 may include a thermostat 71 for controlling the second compressor 32, the second condenser 34 and second metering device 36 to regulate the second predetermined temperature within the at least one second housing 31 to be in a range of approximately −40 to −70 degrees Fahrenheit, −40 to −56.7 Celsius.

The at least one third housing 31 may include a thermostat 81 for controlling the third compressor 32, the third condenser 34 and third metering device 36 to regulate the predetermined temperature within the at least one third housing 31 to be in a range of approximately −40 to −70 degrees Fahrenheit, −40 to −56.7 Celsius.

Further, the at least one fourth housing 31 may include a thermostat 91 for controlling the fourth compressor 32, the fourth condenser 34 and fourth metering device 36 to regulate the predetermined temperature within the fourth housing 31 to be in a range of approximately −40 to −70 degrees Fahrenheit, −40 to −56.7 Celsius.

According to the present invention, the housing 10 provides an atmosphere within said first interior space 12 that is at a first predetermined temperature that becomes the medium for cascading the predetermined temperature within the at least one second, third and fourth housings, 31, 41 and 51 to be at the ultra-low freezing temperature.

As illustrated in FIG. 2, a housing 100 provides two zones of temperature for storing or preserving a frozen product at an ultra-low temperature. At least one first housing 111 provides a first interior space 112 for defining a first zone at a first predetermined temperature.

A first compressor 122 is operatively connected to a first condenser 124 and a first metering device 126 for supplying a first refrigerant to a first evaporator 128 disposed within said first interior space 112 for cooling said first interior space 112 to the first predetermined temperature.

At least one second housing 131 is mounted totally within said first interior space 112. The at least one second housing 131 provides a second interior space 130 for defining a second freezing zone at a second predetermined temperature. The second predetermined temperature is lower relative to the first predetermined temperature.

A second compressor 132 is operatively connected to a second condenser 134 and a second metering device 136 for supplying a second refrigerant to a second evaporator 138 disposed within the at least one second housing 131 for freezing the at least one second housing 131 to the second predetermined temperature. The second compressor 132, the second condenser 134 and the second metering device 136 are disposed within the first interior space 112 and are exposed to the first evaporator 128.

The housing 100 may include at least one second housing 131 that is a freezer that is completely disposed within the first interior space 112. The freezer is operated with the second compressor 132, the second condenser 134 and the second metering device 136 being exposed to the first zone in the first interior space 112 wherein the freezer reduces the temperature within the second freezing zone to be the ultra-low temperature relative to the first predetermined temperature within said first interior space 112.

In the housing 100 the first predetermined temperature within the first interior space 112 may be in a range of approximately −20 to +40 degrees Fahrenheit, −28.9 to +4.4 Celsius. In addition, the second predetermined temperature in the second interior space 130 may be in a range of approximately −40 to −70 degrees Fahrenheit, −40 to −56.7 Celsius.

The housing 100 may include a first thermostat 161 for controlling the first compressor 122, the first condenser 124 and first metering device 126 to regulate the first predetermined temperature within the at least one first housing 112 to be in a range of approximately −20 to +40 degrees Fahrenheit, −28.9 to +4.4 Celsius.

In addition, the at least one second housing 131 may include a thermostat 171 for controlling the second compressor 132, the second condenser 134 and second metering device 136 to regulate the second predetermined temperature within the at least one second housing 131 to be in a range of approximately −40 to −70 degrees Fahrenheit, −40 to −56.7 Celsius.

The housing 100 provides an atmosphere within the first interior space 112 that is at a first predetermined temperature that becomes the medium for cascading the second predetermined temperature within the second interior space 130 to be the ultra-low freezing temperature.

As illustrated in FIG. 3, a schematic drawing is set forth wherein a first interior space 212 is defines a first zone that is maintained at a first predetermined temperature. A first compressor 222 is operatively connected to a first condenser 224 and a first metering device 226 for supplying a first refrigerant to a first evaporator 228 disposed within said first interior space 212 for cooling the first interior space 212 to the first predetermined temperature.

At least one second housing 231 is mounted totally within said first interior space 212. The at least one second housing 231 provides a second interior space for defining a second freezing zone at a second predetermined temperature. The second predetermined temperature is lower relative to the first predetermined temperature.

A second compressor 232 is operatively connected to a second condenser 234 and a second metering device 236 for supplying a second refrigerant to a second evaporator 238 disposed within the at least one second housing 231 for freezing the at least one second housing 231 to the second predetermined temperature. The second compressor 232, the second condenser 234 and said second metering device 236 are disposed within the first interior space 212 and are exposed to the first evaporator 228. The ultra-low temperature freezer provides an atmosphere within the first interior space 212 that is maintained at the first predetermined temperature that becomes the medium for cascading the second predetermined temperature within the second housing 231 to be the ultra-low freezing temperature.

The freezer according to the present invention may be serviced by any refrigeration technician. Special knowledge of two-stage systems is not necessary.

In addition, the present invention reduces the moisture in the low temperature enclosures 10, 100, 300 with respect to the ambient air surrounding the interior housings disposed within the low temperature 10, 100, 300. Less moisture in the air will reduce the frequency of defrosting needed in the ultra-low temperature freezers and will help prevent the evaporator coil from icing up due to prolonged or frequent door openings.

As illustrated in FIG. 4, in another embodiment of the present invention, a freezer 300 with multiple zones of temperature may be utilized. At least one first housing 311 may be maintained at a first predetermined temperature with at least one second housing 411 being maintained at a second predetermined temperature and being disposed within a space 312 of the at least one first housing 311. At least one third housing 531 may be maintained at a third predetermined temperature with the at least one third housing 531 being disposed within a space 412 of the second housing 411. A door 316 may be provided to permit an individual to enter the space 312.

The at least one first housing 311 is operated with a first compressor 332, a first condenser 334 and a first metering device 336 with a first evaporator 328 being mounted within the space 312 for providing a first predetermined temperature in the first zone. A first thermostat 361 is operatively connected to the first compressor 332, the first condenser 334 and the first metering device 336 for controlling the temperature within a space 312 the first housing 311 to be at the first predetermined temperature.

The at least one second housing 411 is positioned within the space 312 and is operated with a second compressor 422, a second condenser 424 and a second metering device 426 being exposed to first evaporator 328 in the first zone wherein the second housing 411 reduces the temperature within the second freezing zone to be a lower temperature relative to the first predetermined temperature within the first zone. A second thermostat 461 is operatively connected to the second compressor 422, the second condenser 424 and the second metering device 426 for controlling the temperature within the space 412 in the second housing 411 to be at the second predetermined temperature.

The at least one third housing 531 is operated with a third compressor 532, a third condenser 534 and a third metering device 536 being exposed to the second evaporator 428 in the second freezing zone wherein the at least one third housing 531 includes a space 530 with a third evaporator 538 being disposed therein for reducing the temperature within the space 530 to form a third freezing zone to be at an ultra-low temperature relative to the second predetermined temperature within the second freezing zone. A third thermostat 571 is operatively connected to the third compressor 532, the third condenser 534 and the third metering device 536 for controlling the temperature within a space 530 in the third housing 511 to be at the third predetermined temperature.

The freezer 300 provides an atmosphere within the first interior space 312 that is at a first predetermined temperature that becomes the medium for cascading the second predetermined temperature within the second interior space 412 to be at a second freezing temperature that becomes the medium for cascading the third temperature within the third interior space 530 to be at the third ultra-low temperature. It is to be understood that any number of housings may be provided to continue to cascade the temperature from one housing to another to continue to lower the temperature within a housing disposed within another housing.

The invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.

Claims

1. A freezer for providing multiple zones of temperature for preserving a frozen product at an ultra-low temperature comprising:

at least one first housing providing a first interior space for defining a first refrigerated zone at a first predetermined temperature;
a first compressor being operatively connected to a first condenser and a first metering device for supplying a first refrigerant to a first evaporator disposed within said first interior space for cooling said first interior space to said first predetermined temperature;
at least one second housing mounted totally within said first interior space, said at least one second housing providing a second interior space for defining a second freezing zone at a second predetermined temperature, said second predetermined temperature being lower relative to said first predetermined temperature; and
a second compressor being operatively connected to a second condenser and a second metering device for supplying a second refrigerant to a second evaporator disposed within said at least one second housing for freezing said at least one second housing to said second predetermined temperature, said second compressor, said second condenser and said second metering device being disposed within said first interior space and being exposed to said first evaporator;
wherein said first predetermined temperature within said first interior space provides a working environmental temperature relative to said second predetermined temperature which is an ultra-low temperature that is not suitable as a working environment.

2. The freezer according to claim 1, wherein said at least one second housing is a freezer that is completely disposed within said first interior space, said freezer being operated with the second compressor, the second condenser and the second metering device being exposed to the first refrigerated zone wherein the freezer reduces the temperature within said second freezing zone to be the ultra-low temperature relative to said first predetermined temperature within said first refrigerated zone.

3. The freezer according to claim 1, wherein said first predetermined temperature is in a range of approximately −20 to +40 degrees Fahrenheit, −28.9 to +4.4 Celsius and the second predetermined temperature is in a range of approximately −40 to −70 degrees Fahrenheit, −40 to −56.7 Celsius.

4. The freezer according to claim 1, wherein said at least one first housing is a walk-in housing and said at least one second housing is disposed within said walk-in housing to enable a working environmental temperature within said at least one first housing while maintaining the at least one second housing at said ultra-low temperature.

5. The freezer according to claim 4, wherein a plurality of second housings is disposed within said first housing.

6. The freezer according to claim 1, wherein said at least one first housing is a freezer and said at least one second housing is a freezer disposed within said at least one first housing.

7. The freezer according to claim 1, and further including a first thermostat for regulating the first predetermined temperature within said at least one first housing to be in a range of approximately −20 to +40 degrees Fahrenheit, −28.9 to +4.4 Celsius.

8. The freezer according to claim 7, and further including a second thermostat for regulating the second predetermined temperature within said at least one second housing to be in a range of approximately −40 to −70 degrees Fahrenheit, −40 to −56.7 Celsius.

9. The freezer according to claim 1, wherein an atmosphere within said first interior space that is at the first predetermined temperature is the medium for cascading the second predetermined temperature within said second interior space to be an ultra-low freezing temperature.

10. A freezer for providing multiple zones of temperature for preserving a frozen product at an ultra-low temperature comprising:

at least one first housing providing a first interior space for defining a first refrigerated zone at a first predetermined temperature;
a first compressor being operatively connected to a first condenser and a first metering device for supplying a first refrigerant to a first evaporator disposed within said first interior space for cooling said first interior space to said first predetermined temperature;
at least one second housing mounted totally within said first interior space, said at least one second housing providing a second interior space for defining a second freezing zone at a second predetermined temperature, said second predetermined temperature being lower relative to said first predetermined temperature; and
a second compressor being operatively connected to a second condenser and a second metering device for supplying a second refrigerant to a second evaporator disposed within said at least one second housing for freezing said at least one second housing to said second predetermined temperature, said second compressor, said second condenser and said second metering device being disposed within said first interior space and being exposed to said first evaporator.

11. The freezer according to claim 10, wherein said at least one second housing is a freezer that is completely disposed within said first interior space, said freezer being operated with the second compressor, the second condenser and the second metering device being exposed to the first refrigerated zone wherein the freezer reduces the temperature within said second freezing zone to be the ultra-low temperature relative to said first predetermined temperature within said first refrigerated zone.

12. The freezer according to claim 10, wherein said first predetermined temperature is in a range of approximately −20 to +40 degrees Fahrenheit, −28.9 to +4.4 Celsius and the second predetermined temperature is in a range of approximately −40 to −70 degrees Fahrenheit, −40 to −56.7 Celsius.

13. The freezer according to claim 10, wherein said at least one first housing is a freezer and said second housing is a freezer disposed within said first housing.

14. The freezer according to claim 10, and further including a first thermostat for regulating the first predetermined temperature within said at least one first housing to be in a range of approximately −20 to +40 degrees Fahrenheit, −28.9 to +4.4 Celsius.

15. The freezer according to claim 14, and further including a second thermostat for regulating the second predetermined temperature within said at least one second housing to be in a range of approximately −40 to −70 degrees Fahrenheit, −40 to −56.7 Celsius.

16. The freezer according to claim 10, wherein an atmosphere within said first interior space that is at a first predetermined temperature is the medium for cascading the second predetermined temperature within said second interior space to be an ultra-low freezing temperature.

17. A freezer for providing multiple zones of temperature for preserving a frozen product at an ultra-low temperature comprising:

at least one first housing providing a first interior space for defining a first refrigerated zone at a first predetermined temperature;
a first compressor being operatively connected to a first condenser and a first metering device for supplying a first refrigerant to a first evaporator disposed within said first interior space for cooling said first interior space to said first predetermined temperature;
at least one second housing mounted totally within said first interior space, said at least one second housing providing a second interior space for defining a second freezing zone at a second predetermined temperature, said second predetermined temperature being lower relative to said first predetermined temperature; and
a second compressor being operatively connected to a second condenser and a second metering device for supplying a second refrigerant to a second evaporator disposed within said at least one second housing for freezing said at least one second housing to said second predetermined temperature, said second compressor, said second condenser and said second metering device being disposed within said first interior space and being exposed to said first evaporator.

18. The freezer according to claim 17, wherein said at least one second housing is a freezer that is completely disposed within said first interior space, said freezer being operated with the second compressor, the second condenser and the second metering device being exposed to the first refrigerated zone wherein the freezer reduces the temperature within said second freezing zone to be the ultra-low temperature relative to said first predetermined temperature within said first zone.

19. The freezer according to claim 17, wherein said first predetermined temperature is in a range of approximately −20 to +40 degrees Fahrenheit, −28.9 to +4.4 Celsius and the second predetermined temperature is in a range of approximately −40 to −70 degrees Fahrenheit, −40 to −56.7 Celsius.

20. The freezer according to claim 17, wherein a plurality of second housings is disposed within said first housing.

21. The freezer according to claim 17, wherein said at least one first housing is a freezer and said at least one second housing is a freezer disposed within said first housing.

22. The freezer according to claim 17, and further including a first thermostat for regulating the first predetermined temperature within said at least one first housing to be in a range of approximately −20 to +40 degrees Fahrenheit, −28.9 to +4.4 Celsius.

23. The freezer according to claim 22, and further including a second thermostat for regulating the second predetermined temperature within said at least one second housing to be in a range of approximately −40 to −70 degrees Fahrenheit, −40 to −56.7 Celsius.

24. The freezer according to claim 17, wherein an atmosphere within said first interior space that is at a first predetermined temperature is the medium for cascading the second predetermined temperature within said second interior space to be an ultra-low freezing temperature.

Patent History
Publication number: 20080245086
Type: Application
Filed: Feb 28, 2008
Publication Date: Oct 9, 2008
Applicant: POLAR KING INTERNATIONAL, INC. (Fort Wayne, IN)
Inventors: David C. Schenkel (Fort Wayne, IN), Bart Thomas Tippmann (Fort Wayne, IN)
Application Number: 12/073,061
Classifications
Current U.S. Class: Compressor Or Its Drive Controlled (62/228.1); Plural Cooled Compartments (62/441)
International Classification: F25D 11/02 (20060101); F25B 49/02 (20060101);