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Pressure Decay Leak Check Method and Apparatus

a leak check and pressure decay technology, applied in lighting and heating apparatus, fluid tightness measurement, instruments, etc., can solve problems such as harmful refrigerant to be released into the atmosphere, affecting the performance and accuracy of refrigerant recovery units, and fire in refrigerant recovery units

Inactive Publication Date: 2012-11-22
BOSCH AUTOMOTIVE SERVICE SOLUTIONS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention provides a refrigerant recovery unit with a method to check for a pressure decay leak. The unit includes a controller that measures ambient temperature, determines saturated vapor pressure, and calculates a test pressure as a percentage of the saturated vapor pressure. The controller also measures the pressure in the recovery unit and determines if it has passed the pressure leak test. The technical effect of this invention is to provide a reliable and efficient means to recover, charge, and recycle refrigerant in a refrigerant system."

Problems solved by technology

New refrigerants such as 1234yf are flammable and thus having a leak can cause a fire in the refrigerant recovery units.
The leak can affect the performance and accuracy of the refrigerant recovery units, and can cause harmful refrigerant to be released into the atmosphere.

Method used

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  • Pressure Decay Leak Check Method and Apparatus
  • Pressure Decay Leak Check Method and Apparatus

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Embodiment Construction

[0018]The invention will now be described with reference to the drawing figures, in which like numerals refer to like parts throughout. A refrigerant recovery unit is provided that includes the ability to self-check for refrigerant leaks in order to prevent continued venting of a refrigerant into the atmosphere.

[0019]FIGS. 1 and 2 show an example of a portable refrigerant recovery unit 10 (recovery unit) constructed according to principles of the invention, for recovering, recycling, and recharging refrigerant from a refrigerant system of a vehicle. Other refrigerant systems, such as ones in a house or a building, are also within the embodiments of this invention.

[0020]The refrigerant recovery unit 10 is a machine having a cabinet 20 supported by a pair of wheels 22, for portability. The refrigerant recovery unit 10 includes a first container or main tank 12 for holding a primary supply of refrigerant, such as 1234yf. The main tank 12 may also be referred to as an internal storage v...

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PUM

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Abstract

Refrigerant recovery unit is provided that includes steps to test for refrigerant leaks. The steps include providing a close loop with the hoses that connect to a refrigerant system, measuring the ambient temperature, calculating the vapor pressure with the ambient temperature, calculating the test pressure as a percentage of the vapor pressure, filling the unit with the refrigerant, and performing a pressure leak test.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority to provisional U.S. patent application entitled “Pressure Decay Leak Check Method and Apparatus,” filed May 12, 2011, having Ser. No. 61 / 487,075, now pending, the disclosure of which is hereby incorporated by reference in its entirety.FIELD OF THE INVENTION[0002]The disclosure generally relates to equipment for servicing vehicle air conditioning systems, and more particularly a method that checks for pressure decay leak in a refrigerant recovery unit used to service a vehicle.BACKGROUND OF THE INVENTION[0003]Portable refrigerant recovery units or carts are used in connection with the service and maintenance of refrigeration systems such as a vehicle's air conditioning system. The refrigerant recovery unit connects to the air conditioning system of the vehicle to recover refrigerant out of the system, separate out oil and contaminants from the refrigerant in order to recycle the refrigerant, and recharge th...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F25B45/00
CPCF25B45/00G01M3/26B60H1/00585F25B2500/222G01M3/3227
Inventor BROWN, WILLIAMMCMASTERS, MARKMURRAY, GARY
Owner BOSCH AUTOMOTIVE SERVICE SOLUTIONS
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