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Apparatus and method for monitoring and regulating cryogenic cooling

a technology of cryogenic cooling and apparatus, applied in the direction of domestic cooling apparatus, container discharge method, instruments, etc., can solve the problems of inability to contact-based temperature measurement, difficult direct sensing of workpiece surface temperature and tool surface temperature in metalworking applications, and inability to achieve contact-based temperature measuremen

Inactive Publication Date: 2011-04-14
AIR PROD & CHEM INC
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AI Technical Summary

Problems solved by technology

Direct sensing of workpiece and tool surface temperature in metalworking applications is challenging.
Due to the fact that both the work and tool are in motion, contact-based temperature measurement is not desirable.
Conventional non-contact temperature measurement devices, such as infra-red (IR) sensors and thermometers, are often inaccurate due to measurement errors induced by the reflectivity of the work and tool materials, as well as low radiation levels in the low-temperature range.

Method used

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  • Apparatus and method for monitoring and regulating cryogenic cooling
  • Apparatus and method for monitoring and regulating cryogenic cooling
  • Apparatus and method for monitoring and regulating cryogenic cooling

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Embodiment Construction

[0014]The present invention is an apparatus for use with a system having a cryogenic cooling component that generates a vapor cloud when operating. Systems that have a cryogenic cooling component may include, but are not limited to, metal rolling and machining operations such as lathe turning, boring, milling, thermal spray coating applications, and food freezing applications.

[0015]“Cryogenic vapor” is a suspension of microscopic water ice crystals which forms when water contained in ambient air comes in contact with a cryogenic spray, such as liquid nitrogen (hereinafter “LIN”), gaseous nitrogen, argon and carbon dioxide or a mixture of two or more of these liquids and / or gases. Cryogenic vapor is typically white and opaque or semi-opaque.

[0016]During experiments relating to the development of the present invention, it was observed that the amount of “cryogenic vapor” evolving from an area in which a cryogenic spray is being directed onto a substrate, e.g. workpiece and / or tool are...

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Abstract

An apparatus and method for monitoring and / or controlling cryogenic cooling by measuring the opacity of the vapor cloud (113) generated from a cryogenic cooling device (112). The opacity is determined by measuring the reduction in intensity of a light beam (127) passed through the vapor cloud (113). The opacity measurements are used to control an operating parameter of the system, such as the cooling rate of the cryogenic cooling device (112). The opacity measurements may be normalized to compensate for variables, other than temperature of the workpiece (119) and cooling rate, which may affect the opacity of the vapor cloud (113).

Description

[0001]This application is the National Stage of International Application No. PCT / US08 / 74465, filed Aug. 27, 2008, which claims the benefit of U.S. Provisional Application No. 60 / 968,479, filed on Aug. 28, 2007, which is incorporated herein by reference in its entirety as if fully set forth.BACKGROUND[0002]The present invention relates to cryogenic spray cooling, which is commonly used in metalworking and other industrial applications that demand cooling to maintain optimal process parameters.[0003]Direct sensing of workpiece and tool surface temperature in metalworking applications is challenging. Due to the fact that both the work and tool are in motion, contact-based temperature measurement is not desirable. Conventional non-contact temperature measurement devices, such as infra-red (IR) sensors and thermometers, are often inaccurate due to measurement errors induced by the reflectivity of the work and tool materials, as well as low radiation levels in the low-temperature range. ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F25D3/10
CPCF25D29/001G01K11/00G01N21/534
Inventor ZURECKI, ZBIGNIEWKNORR, ROBERT ELLSWORTHGREEN, JOHN LEWIS
Owner AIR PROD & CHEM INC
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