Freezer evaporator apparatus

a technology of evaporator and freezer, which is applied in the direction of domestic cooling apparatus, lighting and heating apparatus, refrigeration components, etc., can solve the problems of reducing the lifespan of the unit, accelerating wear and tear of the crankshaft and connecting rod, and increasing operating costs, so as to reduce the “pull down” time and increase the transfer area

Inactive Publication Date: 2013-07-04
STANDEX INT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]It is another aspect of the invention to provide an ULT freezer evaporator apparatus that prevents a low stage compressor from running in a vacuum.
[0010]Another aspect of the invention is to provide an ULT freezer evaporator apparatus that significantly reduces the “pull down” time.
[0011]Finally, it

Problems solved by technology

This vacuum can cause accelerated wear and tear on the crankshaft and connecting rod.
Of course, operating in such a manner is likely to adversely affect the reliability of the compressor.
This requires the compressor to run longer as well thus reducing the lifespan of the unit and also increasing operating costs.
Therefore,

Method used

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Examples

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Embodiment Construction

[0020]Referring now to FIG. 8 where invention 10 is shown in combination with a typical ULT freezer such as manufactured by Nor-Lake, a Wisconsin Company. This freezer is a two-stage compressor system as shown. This unit is powered by a low noise, high performance cascade refrigeration system using two 1 Horsepower hermetically sealed compressors 40, 50. The high stage compressor 40 is an Emerson Model No. RFT42CIE-PFV for 230-volt units or the RFT42CIE-PFA for the 115-volt unit. The low stage compressor 50 is also made by Emerson using the same model as above.

[0021]When the freezer sensor units call for cooling, high stage compressor 40 runs by itself until heat exchanger 42 reaches a temperature of −34 degrees Centigrade. At that time, the controller will start low stage compressor 50 to run with the high stage. The low stage refrigerant will begin to circulate through oil separator 56, downstream to heat exchanger 42 and through filter dryer 60 then to distributor 32 where the re...

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PUM

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Abstract

An ultra low temperature freezer evaporator (ULT) apparatus that has a triple feed capillary tube system. The ULT apparatus prevents the low stage compressor from running in a vacuum. The invention significantly reduces the “pull down” time. Further, the ULT freezer evaporator apparatus significantly increases the transfer area between the evaporator tubing and the contact surface on the unit to assist the transfer of heat from the refrigerated unit through the condenser to the surrounding room.

Description

[0001]This application claims benefit of U.S. Provisional Application Ser. No. 61 / 581,234 filed Dec. 29, 2011, pursuant to 35 USC §119(e).FIELD OF THE INVENTION[0002]This invention relates to ultra low temperature freezer units, in particular, ultra low temperature (ULT) freezers that have an improved evaporator with an improved capillary feed system on the low stage compressor assembly.BACKGROUND OF THE INVENTION[0003]Ultra low temperature (ULT) freezers are typically designed to store and protect critical biological materials. Minus 86° C. freezers are a common product produced by several manufacturers. This type of freezer as well as other ULT freezers operating at even colder temperatures is used for the storage of blood component additives, bone marrow, insect cell culture, mammalian cell culture, nucleic acids (DNA / RNA), sperm, fertilized ova, tissues and viruses.[0004]Referring to FIGS. 1 and 2, a typical prior art ULT freezer 80 has one long continuous run of evaporator tubi...

Claims

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Application Information

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IPC IPC(8): F25B39/02
CPCF25B5/02F25B7/00F25B41/067F25B39/028F25D23/061F25B2341/0661F25B2500/01F25D11/04F25B41/385F25B41/37
Inventor JONES, RONALD WAYNE
Owner STANDEX INT CORP
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