Refrigeration – Cooled enclosure
Reexamination Certificate
2000-09-06
2001-07-17
Doerrler, William (Department: 3744)
Refrigeration
Cooled enclosure
Reexamination Certificate
active
06260377
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a refrigerating apparatus, and more particularly, it relates to a refrigerating apparatus with a vacuum insulating panel built in an insulating frame to maintain ultra low temperatures in the above-mentioned frame.
2. Description of the Related Art
Conventional ultra low-temperature freezers are designed to cool with a refrigerating apparatus of the twin refrigeration system to maintain the temperatures in a freezer under 85° C., using a little thicker insulating material in consideration of a temperature difference between the outside and the inside of the freezer to maintain the in-freezer temperature. In this case, the refrigerating apparatus becomes large and the insulating material becomes thick to maintain the in-freezer temperature.
In this manner, the conventional ultra low-temperature freezers require use of the twin refrigeration apparatus, causing the refrigerating apparatus itself to become large-sized. Also, unless the insulating material is made thick, the in-freezer temperature cannot be maintained. This leads to making the freezer itself large-sized and creating problems such as increased power consumption.
The present invention is intended to solve such problems and an object of the present invention is to provide a refrigerating apparatus which makes sure that the insulation performance in ultra low temperature will not decrease even though the insulation wall is made thin.
SUMMARY OF THE INVENTION
In a refrigerating apparatus according to the present invention comprising an insulating frame formed of a composite structure of a vacuum insulating panel and a foam insulating material, an insulating door made up of a composite structure of vacuum insulating panels and a foam insulating material, and a refrigerating apparatus for cooling goods stored in the insulating frame, there are provided a plurality of refrigerating circuits in cascade connection to make up the refrigerating apparatus so that when ultra low temperature is introduced into the heat insulating frame, heat leaks can be held low without making the insulating wall thick.
Also, in a refrigerating apparatus according to the present invention comprising an insulating frame formed of a composite structure of a vacuum insulating panel and a foam insulating material, an insulating door made up of a composite structure of vacuum insulating panels and a foam insulating material, and a refrigerating apparatus for cooling goods stored in the insulating frame, even if the refrigerating circuits of the refrigerating apparatus are filled up with refrigerants mixed with a plurality of refrigerants containing no chloride, that is, the refrigerants not detrimental to the ozone layer, the temperature in the insulating frame can be made ultra low and heat leaks can also be held low without making the insulating wall thick.
Also, in a refrigerating apparatus according to the present invention, comprising an insulating frame formed of a composite structure of a vacuum insulating panel and a foam insulating material, an insulating door made up of a composite structure of vacuum insulating panels and a foam insulating material, and a refrigerating apparatus for cooling goods stored in the insulating frame, a plurality of inner doors subdivided-from the insulating door are provided inside the insulating door, so that even when the temperature in the heat insulating frame is made ultra low, it is made difficult for the cold air in the frame to change with the outside air as the door is opened or shut.
Moreover, in addition to the above description, according to the present invention, the plurality of inner doors provided inside the insulating door are formed of a composite structure of vacuum insulating panels and a foam insulating material to prevent the cold air from escaping from the inner doors when the insulating door is opened.
Further, in a refrigerating apparatus according to the present invention comprising an insulating frame formed of a composite structure of a vacuum insulating panel and a foam insulating material, an insulating door made up of a composite structure of vacuum insulating panels and a foam insulating material, and a refrigerating apparatus for cooling goods stored in the insulating frame, a refrigerating circuit of the refrigerating apparatus is filled up with at least one refrigerant selected from HFC refrigerants of R-134a, R-407D, R-404A and R-508 to ensure that the temperature in the insulating frame can be held ultra low with generally available refrigerants without destroying the ozone layer.
Still further, in a refrigerating apparatus according to the present invention comprising an insulating frame formed of a composite structure of a vacuum insulating panel and a foam insulating material, an insulating door made up of a composite structure of vacuum insulating panels and a foam insulating material, and a refrigerating apparatus for cooling goods stored in the insulating frame, destruction of the ozone layer with the foaming agent is prevented by using R-134a or a mixture of R-134a and n-pentane as the foaming agent for the foam insulating material, while, at the same time, the insulating wall can be made thin in combination with the a vacuum insulating panel.
Furthermore, a refrigerating apparatus according to the present invention comprising an insulating frame formed of a composite structure of a vacuum insulating panel and a foam insulating material, an insulating door made up of a composite structure of vacuum insulating panels and a foam insulating material, and a refrigerating apparatus for cooling goods stored in the insulating frame is characterized by means for giving an alarm by buzzer, indicator light or the like when the temperature in the insulating frame goes over the preset temperature to show a decrease in cooling capacity when the insulating performance of the vacuum insulating panel has fallen off.
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Sakata Yasushi
Tamaoki Yuichi
Darby & Darby
Doerrler William
Jones Melvin
Sanyo Electric Co,. Ltd.
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