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Method of introducing an in situant into a vapor compression system, especially useful for leak detection, as well as an apparatus for leak detection and a composition useful for leak detection
| Details |
Inventors: Scaringe, Robert Peter; Grzyll, Lawrence R.; Back, Dwight D.; Mayer, Joseph; Meyer, John A.;
Assignee: Mainstream Engineering Corporation (Rockledge, FL)
Primary Examiner: Williams; Hezron
Assistant Examiner: Cygan; Michael
Attorney, Agent or Firm: Crowell & Moring LLP
Leaks are detected in a vapor compression system using fluorescent and daylight visible in situants which are introduced to a system by way of a carrier and dissolved into the systems oil or lubricant. This invention teaches the use of POE oil as a universal carrier fluid, alone or in combination with an alcohol, and combined with one or more "in situants". The in situants are compounds which are the same or substantially similar to compounds already present in oils or lubricants. An on-off UV light source, such as a xenon light, can the be used to visually detect the leak from the vapor compression system components. |
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DETAILED DESCRIPTION The present invention is related to a method of introducing an in situant into a vapor compression system, as well as to a method for detecting leaks in the system components and an apparatus and composition useful for leak detection.
"In situants" are defined as compounds which are the same or substantially similar to compounds already present in oils or lubricants, and which exhibit fluorescence and/or daylight visible qualities.
Daylight visible and ultraviolet fluorescent dyes have been used to detect leaks in refrigeration systems utilizing fluorocarbon refrigerants and refrigerant oils.
Typically, these dyes are introduced into the refrigeration system, and at the site of the leak, the leaking refrigerant, oil and dye are detected under normal or UV light.
The term "dye" in the context of leak detection generally refers to a compound that is distinctively different or unintentionally similar to components in the host fluid, having the specific purpose of generating a detectable color from a fluid.
Typical dyes used by the industry up to present include blue anilino-anthraquinones, xanthenes, perylenes, and naphthalimides.
More specifically, a leak-detecting trace fluid, which is generally a fluorescence (powdered) dye material dissolved in an oil or petroleum fraction carrier, is introduced into the refrigeration system.
The fluorescent dye material is carried throughout the system, and at the location of a leak, the refrigerant, oil, and fluorescent dye material leak into the atmosphere.
The refrigerant is subsequently vaporized, leaving an oil residue containing the fluorescent dye material.
Application of a UV light to this area results in the illumination of the oil/fluorescent dye material.
The primary factors in selecting these dyes for use in leak detection is that the dyes are soluble in the host fluid, and that the dyes are used in such low concentrations that their presence does not alter the intended normal function of the host fluid.
U.
S.
Pat.
No.
1,915,965 discloses a leak detector method for a compression refrigeration system
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Lighting 
