Apparatus and method for monitoring and regulating cryogenic cooling

A kind of equipment and low-temperature technology, applied in lighting and heating equipment, household refrigeration equipment, metal processing equipment, etc., can solve problems such as measurement errors and inaccuracies

Inactive Publication Date: 2010-09-22
AIR PROD & CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional non-contact temperature measurement devices, such as infrared (IR) sensors and thermometers, are often inaccurate due to measurement errors caused by the reflectivity of workpiece and tool materials and low radiation levels in the cryogenic 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

[0015] The present invention is an apparatus for use with a system having a cryogenically cooled member that generates a vapor cloud when in operation. Systems with cryogenically cooled components 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.

[0016] "Cryogenic vapor" is a cryogenic injection of water contained in ambient air with, for example, liquid nitrogen (hereinafter "LIN"), gaseous nitrogen, argon, and carbon dioxide, or mixtures of two or more of these liquids and / or gases A suspension of microscopic water ice crystals that form on contact. Cryogenic vapors are usually white and opaque or translucent.

[0017] In experiments related to the development of the present invention, it has been observed that from the area where the cryogenic spray is directed onto the substrate (e.g., the workpiece and / or tool area and / or the part surfac...

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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 (1 13). The opacity measurements are used to control an operating parameter of the system, such as the cooling rate of the cryogenic cooling device (1 12). 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] 【cross reference】 [0002] This application claims the benefit of Provisional Application No. 60 / 968,479, filed August 28, 2007, which is hereby incorporated by reference in its entirety as if fully set forth. 【Technical field】 [0003] The present invention relates to cryogenic spray cooling, which is generally used in metalworking and other industrial applications where cooling is required to maintain optimum process parameters. 【Background technique】 [0004] Direct sensing of workpiece and tool surface temperatures in metalworking applications is challenging. Due to the fact that both the workpiece and the tool are in motion, contact based temperature measurement is not desirable. Conventional non-contact temperature measuring devices, such as infrared (IR) sensors and thermometers, are often inaccurate due to measurement errors caused by the reflectivity of workpiece and tool materials and low radiation levels in the cryogenic range. Accurate temperature measur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K13/00
CPCB23Q11/1053B21B37/74G01K11/00F25D29/001G01N21/534
Inventor Z·朱雷克基R·E·小诺尔J·L·格伦
Owner AIR PROD & CHEM INC
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