Gas-expanded lubricants for increased energy efficiency and related method and system

• US 9,873,852 B2
• Filed: 10/15/2010
• Issued: 01/23/2018
• Est. Priority Date: 10/16/2009
• Status: Active Grant

• Current Assignee: University of Virginia
• Original Assignee: University of Virginia Patent Foundation (University of Virginia)
• Inventors: Clarens, Andres F., Allaire, Paul E., Younan, Amir, Wang, Shibo
• Primary Examiner(s): Riegelman, Michael A
• Application Number:
  US13/502,066
• Publication Number:
  US 20120199421A1
• Time in Patent Office: 2,657 Days
• Field of Search: 184 621, 184 611, 508485, 508579, 508110
• CPC Class Codes: C10M 111/04 at least one of them being a macromolecular organic compound
• CPC Class Codes: C10M 169/04 Mixtures of base-materials and additives
• CPC Class Codes: C10M 171/005 Volatile oil compositions; Vaporous lubricants
• CPC Class Codes: C10M 2201/04 Elements
• CPC Class Codes: C10M 2201/0403 used as base material
• CPC Class Codes: C10M 2201/16 Carbon dioxide
• CPC Class Codes: C10M 2203/1006 used as base material
• CPC Class Codes: C10M 2205/0285 used as base material
• CPC Class Codes: C10M 2207/2835 used as base material
• CPC Class Codes: C10M 2209/1033 used as base material
• CPC Class Codes: C10N 2030/02 Pour-point; Viscosity index
• CPC Class Codes: C10N 2030/58 Elastohydrodynamic lubrication, e.g. for high compressibility layers
• CPC Class Codes: C10N 2040/02 Bearings
• CPC Class Codes: C10N 2050/06 Gaseous phase, at least during working conditions
• CPC Class Codes: F16C 17/03 with tiltably-supported segments, e.g. Michell bearings hydrostatic bearings with tiltably supported bearing pads F16C32/0666; made from a plurality of rods F16C33/26; with flexible leaves F16C17/024; hydrodynamic bearings with chambers F16C33/1075
• CPC Class Codes: F16C 33/6662 the liquid being carried by air or other gases, e.g. mist lubrication
• CPC Class Codes: F16N 7/30 the oil being fed or carried along by another fluid in internal- combustion engines F02F
• CPC Class Codes: F16N 7/32 Mist lubrication splash lubrication F16N7/26

Abstract

Method and System of lubricating at least one moving part with a medium. The medium includes a dissolved mixture of lubricant and compressed gas. The amount of lubricant and compressed gas may be controlled in forming the dissolved mixture in response to input conditions. A user and/or external factors may be used to determine the input conditions. In response to the input conditions the amount of lubricant and compressed gas is delivered to the moving part that is housed in a pressurized chamber. The properties of the dissolved mixture can be adjusted, whereby the properties may include, but are not limited to, the following: viscosity, temperature, and thermal conductivity. This adjustment to the gas may be accomplished, for example, by releasing gas from the pressurized chamber in an amount to adjust the properties. In a further approach, lubricant may be scavenged from the pressurized chamber by returning surplus lubricant to its original source or other designated location.

Claims

1. A method of lubricating at least one moving part with a medium, wherein said method comprises:

delivering the medium to at least one moving part for lubrication, wherein said medium when supplied to at least one moving part for lubrication is comprised of a completely dissolved mixture of a lubricant and a compressed gas.

2. The method of claim 1, wherein at least one moving part is one or more selected from the group consisting of rotor, bearing, or gear.

3. The method of claim 1, wherein said lubricant comprises at least one of:

synthetic lubricant, semi-synthetic lubricant, petroleum oil, of refined petroleum oil.

4. The method of claim 3, wherein said synthetic lubricant comprises at least one of the following:

Polyalkylene Glycol (PAG), Poly-Alpha Olefin (PAO), Trimethylolpropane (TMP) Ester or other lubricant formulation with good gas solubility.

5. The method of claim 1, wherein said compressed gas is one or more selected from the group consisting of Carbon Dioxide, Nitrogen, Argon, Air, or Helium.

6. The method of claim 1, wherein said dissolved mixture has properties between those of a pure lubricant and a gas.

7. The method of claim 1, wherein said delivery further comprises:

controlling the supply and the proportion of said lubricant and said compressed gas being transferred to the at least one moving part.

8. The method of claim 1, further comprising:

providing input conditions for said delivery.

9. The method of claim 8, wherein said input conditions are defined by a user and/or controller in response to some external factor.

10. The method of claim 9, wherein said input conditions are configurable in real time.

11. The method of claim 9, wherein said input conditions are configurable continuously.

12. The method of claim 9, wherein said input conditions are configurable over intervals of time.

13. The method of claim 9, wherein said input conditions are configurable in real time, continuously and over intervals of time.

14. The method of claim 8, wherein said input conditions determine the respective proportions of said lubricant and said gas in forming said dissolved mixture.

15. The method of claim 1, further comprising adding and/or releasing a quantity of said gas from a pressurized chamber to adjust the viscosity, temperature, and thermal conductivity of said mixture.

16. The method of claim 15, wherein said adding and/or releasing comprises venting said gas, thereby decreasing the pressure of said mixture in said pressurized chamber.

17. The method of claim 15, wherein said adding and/or releasing comprises venting said gas, thereby affecting the temperature of said mixture in said pressurized chamber.

18. The method of claim 15, wherein said adding and/or releasing comprises venting said gas, thereby affecting the thermal conductivity of said mixture in said pressurized chamber.

19. The method of claim 1, wherein said moving part is housed in a pressurized chamber, said method further comprising scavenging a quantity of surplus lubricant from said pressurized chamber and returning said lubricant to said lubricant reservoir.

20. A system for lubricating at least one moving part with a medium, wherein said system comprises:

a pressurized chamber configured to house the at least one moving part;

a lubricant reservoir configured to house a lubricant; and

a gas reservoir configured to house a gas, wherein said lubricant reservoir and said gas reservoir are configured to;

combine said lubricant and said gas into a completely dissolved mixture of said lubricant and said compressed gas to form said medium, and

deliver said medium while in the completely dissolved mixture of the lubricant and the compressed gas into the pressurized chamber to the at least one moving part while in the completely dissolved mixture of the lubricant and the compressed gas for the lubrication of the at least one moving part.

21. The system of claim 20, wherein at least one moving part is one or more selected from the group consisting of rotor, bearing, or gear.

22. The system of claim 20, wherein said lubricant comprises at least one of:

synthetic lubricant, semi-synthetic lubricant, petroleum oil, or refined petroleum oil.

23. The system of claim 22, wherein said synthetic lubricant comprises at least one of the following:

Polyalkylene Glycol (PAG), Poly-Alpha Olefin (PAO), Trimethylolpropane (TMP) Ester or other lubricant formulation with good gas solubility.

24. The system of claim 20, wherein said gas is one or more selected from the group consisting of Carbon Dioxide, Nitrogen, Argon, Air, or Helium.

25. The system of claim 20, wherein said mixture has properties between those of a pure lubricant and a gas.

26. The system of claim 20, further comprising a controller to allow the transfer of a quantity of said lubricant from said lubricant reservoir and a quantity of said gas from said gas reservoir to said moving part.

27. The system of claim 26, wherein the function of said controller is determined in response to input conditions.

28. The system of claim 27, wherein said input conditions are defined by a user and/or controller in response to some external factor.

29. The system of claim 27, wherein said input conditions are configurable in real time.

30. The system of claim 27, wherein said input conditions are configurable continuously.

31. The system of claim 27, wherein said input conditions are configurable over intervals of time.

32. The system of claim 27, wherein said input conditions are configurable in real time, continuously and over intervals of time.

33. The system of claim 27, wherein said input conditions determine the respective proportions of said lubricant and said gas in forming said dissolved mixture.

34. The system of claim 20, further comprising a gas purge device configured to release gas from said pressurized chamber, thereby decreasing the pressure of said mixture in said pressurized chamber.

35. The system of claim 20, further comprising a gas purge device configured to release gas from said pressurized chamber, thereby affecting the temperature of said mixture in said pressurized chamber.

36. The system of claim 20, further comprising a gas purge device configured to release gas from said pressurized chamber, thereby affecting the thermal conductivity of said mixture in said pressurized chamber.

37. The system as in any one of claim 34, 35, or 36, wherein said gas purge device is one or more selected from the group consisting of valve, vent, or egress.

38. The system of claim 20, further comprising a return channel, said return channel configured to scavenge a quantity of surplus lubricant from said pressurized chamber and return said lubricant to said lubricant reservoir.

39. The system of claim 20, wherein said gas reservoir is configured to add gas to said pressurized chamber, thereby increasing the pressure of said mixture in said pressurized chamber.

40. The system of claim 20, wherein said gas reservoir is configured to add gas to said pressurized chamber, thereby affecting the temperature of said mixture in said pressurized chamber.

41. The system of claim 20, wherein said gas reservoir is configured to add gas to said pressurized chamber, thereby affecting the thermal conductivity of said mixture in said pressurized chamber.