ELECTROSTATIC LUBRICANT AND METHODS OF USE

• US 20100077792A1
• Filed: 09/28/2008
• Published: 04/01/2010
• Est. Priority Date: 09/28/2008
• Status: Abandoned Application

• Current Assignee: Echogen Power Systems (Delawere) Inc
• Original Assignee: Rexorce Thermionics, Inc.
• Inventors: Gurin, Michael H.
• Application Number:
  US12/239,811
• Publication Number:
  US 20100077792A1
• Time in Patent Office: Days
• US Class Current: 62/470
• CPC Class Codes: B05B 5/08 Plant for applying liquids or other fluent materials to objects
• CPC Class Codes: B05B 5/14 specially adapted for coating continuously moving elongated bodies, e.g. wires, strips, pipes
• CPC Class Codes: C10M 105/72 containing sulfur, selenium or tellurium
• CPC Class Codes: C10M 105/74 containing phosphorus
• CPC Class Codes: C10M 2219/003 used as base material
• CPC Class Codes: C10M 2223/0405 used as base material
• CPC Class Codes: C10N 2020/077 Ionic Liquids
• CPC Class Codes: C10N 2030/06 Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
• CPC Class Codes: C10N 2030/60 Electro rheological properties
• CPC Class Codes: C10N 2040/02 Bearings
• CPC Class Codes: C10N 2040/08 Hydraulic fluids, e.g. brake-fluids
• CPC Class Codes: C10N 2040/135 Steam engines or turbines
• CPC Class Codes: C10N 2040/30 Refrigerators lubricants or compressors lubricants
• CPC Class Codes: F16C 32/064 the liquid being supplied under pressure
• CPC Class Codes: F16C 33/10 Construction relative to lubrication lubrication in general F16N

Abstract

An integrated thermodynamic system for enhancing the energy efficiency and operating lifetime by reducing wear of moving parts is provided. The system provides automated means to attract or repel electrically conductive or magnetic lubricants in a dynamic manner. The system, when utilizing advanced lubricants including ionic liquids, poly(ionic) liquids, electrorheological fluids, or expanded fluid; and a control system implementing dynamic algorithms, preferably meets the complex demands of thermodynamic systems, particularly high speed rotating equipment, for obtaining high efficiency that requires low friction and long lifetimes that requires superior wear resistance.

Claims

1. A thermodynamic system comprising a thermodynamic device, a lubricant, a thermodynamic working fluid, the thermodynamic device having moving surfaces operable to create both hydrostatic and hydrodynamic forces, wherein the thermodynamic working fluid temperature increases from friction of the thermodynamic device, wherein the lubricant is at least partially immiscible with the thermodynamic working fluid and is operable to reduce friction at least 10 percent through the hydrostatic force within the thermodynamic device.

2. The thermodynamic system according to claim 1, wherein the thermodynamic working fluid is further comprised of the lubricant operable to absorb an absorbate having a first pressure P1, a first temperature T1, and a first density D1, wherein the lubricant temperature increases to a second temperature T2 and has a second pressure P2 and second density D2, wherein the lubricant at the second temperature T2 desorbs at least 5 weight percent of the absorbate being the desorbed absorbate.

3. The thermodynamic system according to claim 1 wherein the thermodynamic device is selected from the group consisting of a compressor, expander, or pump.

4. The thermodynamic system according to claim 1 wherein the thermodynamic working fluid absorbent and the lubricant are both selected from the group consisting of ionic liquids, liquid ionic phosphates, polyammonium ionic liquid sulfonamides, and poly(ionic liquids).

5. The thermodynamic system according to claim 1 wherein the thermodynamic lubricant is selected from the group consisting of ionic liquids, liquid ionic phosphates, polyammonium ionic liquid sulfonamides, and poly(ionic liquids), wherein the thermodynamic lubricant absorbs at least 1% by weight of the thermodynamic working fluid.

6. The thermodynamic system according to claim 1 further comprising at least two heat exchangers and a separation device to isolate at least 90 percent of the lubricant from the thermodynamic working fluid operable to increase heat transfer by at least 5 percent of the at least two heat exchangers.

7. The thermodynamic system according to claim 1 further comprising a hydrostatic bearing, a thermodynamic working fluid high pressure accumulator, and a control system having at least one working fluid high pressure valve, wherein the control system controls the at least one working fluid high pressure valve to allow passage of the thermodynamic working fluid from the thermodynamic working fluid high pressure accumulator operable to create a hydrostatic force on the hydrostatic bearing to reduce by at least 50% the dry running friction between moving surfaces of the thermodynamic device.

8. The thermodynamic system according to claim 5 wherein the lubricant desorbs at least 0.5% by weight of the thermodynamic working fluid being the desorbed absorbate from the lubricant by at least one desorption method including electrostatic desorption, electromagnetic desorption, or thermal desorption.

9. The thermodynamic system according to claim 5 wherein the lubricant desorbs at least 0.5% by weight of the thermodynamic working fluid from the lubricant by electrostatic desorption or electromagnetic desorption, and wherein the electrostatic or electromagnetic field concurrently increases the hydrodynamic film thickness by at least 5%.

10. The thermodynamic system according to claim 5 further comprised of a first electrostatic device operable to attract the lubricant to at least one moving surface of the thermodynamic device and a second electrostatic device operable to isolate the lubricant from the thermodynamic working fluid after lubricating the thermodynamic device moving surfaces.

11. The thermodynamic system according to claim 7 wherein the control system regulates the thermodynamic working fluid from the thermodynamic working fluid high pressure accumulator operable to balance the real-time load on the hydrostatic bearing.

12. The thermodynamic system according to claim 7 further comprised of at least one bearing selected from the group of gas bearing, air foil bearing, or magnetic bearing, wherein the control system regulates the thermodynamic working fluid from the thermodynamic working fluid high pressure accumulator operable to create a hydrostatic force on the hydrostatic bearing until the thermodynamic device is operating at a speed whereby the bearing creates a hydrostatic or magnetic force to reduce by at least 50% the dry running friction between moving parts of the thermodynamic device.

13. The thermodynamic system according to claim 8 wherein the desorbed absorbate volumetrically expands by at least 3 percent creating a hydrostatic force and is operable to reduce friction of the moving surfaces by at least 10 percent greater than the lubricant without desorbed absorbate.

14. The thermodynamic system according to claim 8 wherein the desorbed absorbate expands to the second density D2 and is operable to create a second operating pressure P2 and a localized seal to reduce leak paths, and wherein pressure P2 is at least 10 psi higher than the first operating pressure P1.

15. The thermodynamic system according to claim 8 wherein the desorbed absorbate is operable as a refrigerant in a thermodynamic cycle.

16. The thermodynamic system according to claim 13 wherein the second electrostatic device is selected from the group consisting of an electrostatic filter, an electrode, or an electrostatic membrane.

17. The thermodynamic system according to claim 13 wherein the first electrostatic device is selected from the group consisting of an electrode, a porous electrode or an electrostatic membrane.

18. A thermodynamic system comprising a thermodynamic device having at least one moving surface, a thermodynamic working fluid, a lubricant, a first electrostatic device operable to attract the lubricant to the at least one moving surface of the thermodynamic device, and a second electrostatic device, operable to isolate the lubricant from the thermodynamic working fluid after lubricating the thermodynamic device moving surfaces.

19. The thermodynamic system according to claim 18 further comprising an expansion device, wherein the expansion device is upstream of the second electrostatic device.

20. The thermodynamic system according to claim 18 further comprising a heat exchanger device, wherein the heat exchanger device is downstream of the second electrostatic device.

21. A thermodynamic system comprising a thermodynamic device having at least one moving surface, a thermodynamic working fluid, a lubricant, a first electrostatic device having at least two modes of operation including the mode of attracting the lubricant to the at least one moving surface or the mode of repelling the lubricant from the at least one moving surface.

22. The thermodynamic system according to claim 21 further comprising a temperature sensor to measure the lubricant temperature.

23. The thermodynamic system according to claim 21 further comprising a control system, a lubricant injection device, and a switching device to reverse the polarity of the electrostatic device, wherein the control system is operable to switch the polarity of the electrostatic device between the operating mode of attracting the lubricant and repelling the lubricant from the at least one moving surface.

24. The thermodynamic system according to claim 21 further comprising at least one friction reducing device operable to reduce friction of the at least one moving surface by at least 10 percent wherein the at least one friction reducing device includes gas bearings, gas foil bearings, and magnetic bearings.

25. The thermodynamic system according to claim 21 further comprising a membrane operable to contain the lubricant and to pass the thermodynamic working fluid.

26. The thermodynamic system according to claim 23 wherein the control system is operable to switch the electrostatic device to attract the lubricant when the at least one friction reducing device is operating at a speed at least 50 percent less than the thermodynamic device operating speed, and to repel the lubricant when the at least one friction reducing device is operating at a speed at least 50 percent of the thermodynamic device operating speed.

27. The thermodynamic system according to claim 26 wherein the control system is operable to switch the electrostatic device to attract the lubricant and to limit the flow of the thermodynamic working fluid operable as a flow control valve.

28. The thermodynamic system according to claim 26 wherein the control system is operable to switch the electrostatic device to repel the lubricant and to limit the flow of the thermodynamic working fluid operable as a flow control valve.

29. The thermodynamic system according to claim 26 wherein the control system varies the electrostatic device by dynamically changing the electrostatic device operating voltage operable to vary the thermodynamic working fluid flow rate.

30. A thermodynamic system comprising a thermodynamic device having at least one moving surface, a thermodynamic working fluid and a lubricant, wherein the thermodynamic working fluid is an expanded fluid wherein the expanded fluid has a decreasing density of at least 3 percent for an increase in temperature of at least 15 Kelvin and is operable to reduce friction of the at least one moving surface.

31. The thermodynamic system according to claim 30 wherein the lubricant is an absorbent of the thermodynamic working fluid.

32. The thermodynamic system according to claim 30 further comprised of an electrostatic device operable to concurrently attract the lubricant to the at least one moving surface and to at least partially desorb the thermodynamic working fluid from the absorbent.

33. A thermodynamic system comprising a thermodynamic device having at least one moving surface, a thermodynamic working fluid, a lubricant, and an electrostatic or electromagnetic device, wherein the thermodynamic working fluid is a binary fluid having an absorbate and an absorbent, wherein the lubricant is electrically conductive, and wherein the lubricant concurrently increases lubricity by at least 5 percent of the at least one moving surface and increases desorption of the absorbate from the absorbent.

34. The thermodynamic system according to claim 33 further comprised of an electrical or magnetic field operable to increase the desorption of the absorbate from the thermodynamic working fluid.

35. The thermodynamic system according to claim 33 further comprised of an electrical or magnetic field operable to increase the absorption of the absorbate from the thermodynamic working fluid.

36. The thermodynamic system according to claim 33, wherein the lubricant is comprised of at least one compound selected from the group consisting of ionic liquids, liquid ionic phosphates, polyammonium ionic liquid sulfonamides, poly(ionic liquids) and expanded fluid.

37. A thermodynamic device comprising a thermodynamic device having at least one moving surface, a thermodynamic working fluid, a lubricant, a nanofiltration membrane, and an electrostatic or electromagnetic device, wherein the thermodynamic working fluid is capable of passing through the nanofiltration membrane, wherein the lubricant is electrically conductive or magnetic, and wherein the electrostatic or electromagnetic device is operable to attract or repel the lubricant within the nanofiltration membrane as a means to control the passing of the thermodynamic working fluid through the nanofiltration membrane.

38. The thermodynamic system according to claim 37, wherein the nanofiltration membrane has a pore size that is at least 5% smaller than the lubricant molecular size, and at least 5% greater than the thermodynamic working fluid molecular size.

39. The thermodynamic system according to claim 37, wherein the lubricant is at least one selected from the group consisting of ionic liquids, liquid ionic phosphates, polyammonium ionic liquid sulfonamides, poly(ionic liquids), and electrorheological fluids.

40. A lubricant, comprising an absorbent having a gas absorption of at least 0.5% on a weight basis and having a gas desorption being desorbed gas of at least 0.25% on a weight basis when applied to at least one moving surface operable to reduce friction by utilizing the desorbed gas to reduce the physical contact between the at least one moving surface.

41. The lubricant according to claim 40 further comprising an electrostatic field, wherein the electrostatic field causes a gas desorption of at least 0.25% on a weight basis.

42. The lubricant according to claim 40 further comprising an electrostatic field, wherein the electrostatic field causes the concurrent gas desorption of at least 0.25% on a weight basis and an increase in hydrodynamic film thickness through electrostatic attraction of the absorbent to the at least one moving surface.

43. The lubricant according to claim 40 wherein the lubricant is applied to the at least one moving surface of a power producing or power consuming devices including air compressors, vacuum pumps, fuel pumps, fluid pumps, hydraulic pumps, hydraulic motors, turbines, positive displacement pumps, and positive displacement motors.

44. The lubricant according to claim 40 wherein the lubricant is functionalized to increase the gas absorption ability to at least 1% on a weight basis.

45. The lubricant according to claim 42 further comprised of a temperature sensor in thermal communication with the lubricant and a reservoir of cooled lubricant operable to switch the electrostatic field to repel the lubricant when the lubricant exceeds a maximum temperature threshold sequentially followed by a switch in polarity of the electrostatic field to attract the lubricant from the reservoir of cooled lubricant.

46. A thermodynamic system comprising thermodynamic device having at least one moving surface, a binary thermodynamic working fluid, wherein the thermodynamic device is an absorption heat pump comprised of a weak solution, and a strong solution, wherein the strong solution has an absorbate, and wherein the weak solution or strong solution is operable as a friction reducing lubricant.

47. The thermodynamic system according to claim 46 further comprising an expansion device having at least one moving surface, wherein the weak solution is mixed with the thermodynamic working fluid after being expanded through the expansion device within the at least one moving surface operable as a friction reducing lubricant while concurrently increasing absorption of the thermodynamic working fluid by the weak solution due to the mixing within the expansion device.

48. The thermodynamic system according to claim 46 further comprising a pump having friction producing moving parts, wherein the strong solution after passing through the pump is mixed within the at least one moving surface operable as a friction reducing lubricant while concurrently increasing enthalpy of the strong solution due to the thermal energy from friction within the pump.

49. A friction reducing machine comprised of at least one moving part, a friction reducing lubricant, a fluid port that is operational as both the fluid inlet and discharge outlet, and a nanofiltration membrane within the fluid port, wherein the nanofiltration membrane is operable to contain the friction reducing lubricant within the at least one moving surface of the friction reducing machine.

51. The friction reducing machine according to claim 49 wherein the friction reducing machine is a device selected from the group consisting of a gerotor motor, gerotor pump, vane motor, vane pump, piston motor, and piston pump.

50. The friction reducing machine according to clam 49 further comprised of an electrostatic field wherein the electrostatic field is operable to increase the hydrodynamic film between the at least one moving surface.

52. A thermodynamic system comprising a thermodynamic device having at least one moving surface, a thermodynamic working fluid, an expansion device having a hydrostatic bearing, a high pressure side wherein the high pressure side is upstream of the expansion device, at least one valve controlling the flow of the thermodynamic working fluid into the expansion device, at least one valve controlling the flow of the thermodynamic working fluid into the hydrostatic bearing, a thermodynamic working fluid high pressure accumulator, and a control system wherein the control system regulates the at least one valve controlling the flow of the thermodynamic working fluid into the expansion device and the at least one valve controlling the flow of the thermodynamic working fluid into the hydrostatic bearing from the thermodynamic working fluid high pressure accumulator operable to create a hydrostatic force on the hydrostatic bearing to reduce by at least 50% the dry running friction between moving parts of the expansion device.

53. The thermodynamic system according to claim 52 further comprising a pumping or compressing device having a hydrostatic bearing, at least one valve controlling the flow of the thermodynamic working fluid into the pumping or compressing device, at least one valve controlling the flow of the thermodynamic working fluid into the pumping or compressing device hydrostatic bearing wherein the control system regulates the at least one valve controlling the flow of the thermodynamic working fluid into the pumping or compressing device and the at least one valve controlling the flow of the thermodynamic working fluid into the pumping or compressing hydrostatic bearing from the thermodynamic working fluid high pressure accumulator operable to create a hydrostatic force on the pumping or compressing hydrostatic bearing to reduce by at least 50% the dry running friction between moving parts of the pumping or compressing device.

54. The thermodynamic system according to claim 52 wherein the control system regulates the thermodynamic working fluid from the thermodynamic working fluid high pressure accumulator operable to balance the real-time load on the hydrostatic bearing.

55. The thermodynamic system according to claim 52 further comprised of at least one bearing selected from the group of gas bearing, air foil bearing, or magnetic bearing, wherein the control system regulates the thermodynamic working fluid from the thermodynamic working fluid high pressure accumulator operable to create a hydrostatic force on the expansion device hydrostatic bearing until the expansion device is operating at a speed whereby the at least one bearing creates a hydrostatic or magnetic force to reduce by at least 50% the dry running friction between moving parts of the thermodynamic device.