US3813850A - Oil recovery method for displacement rotary air compressor - Google Patents

Oil recovery method for displacement rotary air compressor Download PDF

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Publication number
US3813850A
US3813850A US00285872A US28587272A US3813850A US 3813850 A US3813850 A US 3813850A US 00285872 A US00285872 A US 00285872A US 28587272 A US28587272 A US 28587272A US 3813850 A US3813850 A US 3813850A
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US
United States
Prior art keywords
oil
compressor
water
additive
percent
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Expired - Lifetime
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US00285872A
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English (en)
Inventor
E Uratani
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SUMIDA EQUIP IND
SUMIDA EQUIPMENT IND Inc JA
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SUMIDA EQUIP IND
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/02—Lubrication; Lubricant separation
    • F04C29/026—Lubricant separation
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2211/00—Organic non-macromolecular compounds containing halogen as ingredients in lubricant compositions
    • C10M2211/02—Organic non-macromolecular compounds containing halogen as ingredients in lubricant compositions containing carbon, hydrogen and halogen only
    • C10M2211/022—Organic non-macromolecular compounds containing halogen as ingredients in lubricant compositions containing carbon, hydrogen and halogen only aliphatic
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2211/00—Organic non-macromolecular compounds containing halogen as ingredients in lubricant compositions
    • C10M2211/06—Perfluorinated compounds

Definitions

  • ABSTRACT Primary ExaminerCharles N. Hart Attorney, Agent, or FirmHans Berman [57] ABSTRACT
  • the turbine oil used in a screw-type air compressor as a lubricant and sealant is mixed with approximately 40 percent trichlorofluoromethane, trichlorotrifluoroethane, or dichlorotetrafluoroethane to raise the specific gravity of the mixture above that of water.
  • trichlorofluoromethane trichlorotrifluoroethane
  • dichlorotetrafluoroethane dichlorotetrafluoroethane
  • This invention relates to an oil recovery method for an air compressor, and more particularly, to a method of recovering oil used in the lubrication, cooling, and sealing of positive displacement rotary air compressors such as a screw type compressor or the like.
  • anti-emulsifying oil is conventionally used in the screw type compressor so that the oil finely divided as a mist is carried in the exhausted air separately from the water. This allows the oil to readily pass along with the air through the oil separator. In fact, it has been found that capture of oil in the oil separator is complete if the exhausted air is cooled to form the finely divided oil into relatively large droplets. However, this increases the condensation of water. Cooling of the compressor is also accompanied by an increase in the condensation of water.
  • Water of condensation has a higher specific gravity than that of oil and may lay under the layer of oil in the oil separator to rust the compressor if this condensed water is fed along with the air to the compressor and should the quantity of condensed water become large, it may lead to burning out of the compressor due to poor lubrication.
  • separation of water from the oil and disposition of the water are necessary, but it is very difficult to automatically discharge the water from under the oil.
  • the prior art apparently has failed to not only lower the temperature of compressed air to be treated by the oil separator to an extent suitable for oil separation but also to cool down the compressor sufficiently.
  • this object is accom plished by adding and mixing a proper material with the oil to be used to cause the oil to reach a higher specific gravity than that of water.
  • FIG. 1 is a schematic representation showing a typical oil recovery apparatus system for the compressor in which the conventional method is carried out
  • FlG. 2 is a schematic representation showing a preferred oil recovery apparatus system for the compressor in which a method according to the present invention is carried out.
  • the boiling point of additive material under atmospheric pressure is higher than the freezing point of water but lower than the boiling point thereof. (The additive material should not be evaporated within the compressed air.)
  • the solubility of additive material is high with respect to the oil but is low with respect to the water (for the purpose of adding to the oil to be used and of facilitating its separation from the condensed water.)
  • the additive material should be of high specific gravity (for the purpose of adding to the oil to be used thereby causing the specific gravity of oil to be more than that of water.)
  • the additive material must have appropriate viscosity (to provide the oil with appropriate lubricant property.)
  • the additive material should be noninflammable, non-toxic, and anti-corrosive to machinery and tools.
  • Additive Oil in Use turbine oil according to Japanese Industrial Standard No. 200 Nov 180 N0.
  • 34- 3 R-l l4 39 -41 These oils having additive material added as above exhibit performances similar to that of conventional oils in lubrication, cooling, and sealing for the compressor.
  • FIG. 1 there is shown Conventional oil recovery systems, wherein conventional oil fed to a screw type air compressor 1 serves for lubrication, cooling, and sealing in the compressor and passes through a check valve 2 and then into an oil separator (or oil recovery device) 3 together with the compressed air.
  • the oil separated and recovered from the air by the oil separator passes through an oil temperature regulating valve or an oil cooler 4 and is again fed back to the compressor by an oil pump 6.
  • the condensed water deposited in the bottom of the oil separator can be drained through a drain valve 7.
  • FIG. 2 there is illustrated a typical system with which the present invention is carried out.
  • the additive material is mixed with the oil to be supplied into the screw type air compressor 1 whereby the oil exhibits a heavier specific gravity than that of water.
  • the oil having the additive material mixed serves for lubrication, cooling and sealing in the compressor in the same manner as the conventional oil and is discharged with the compressed air through the check valve 2.
  • the compressed air with oil is fully cooled in a cooler 4 before the oil separator (or recovery device) 3.
  • the condensed water and oil are separated from the compressed air by the oil separator and then distinctly divided into two phases, wherein the oil is deposited below the layer of 4 water in the oil separator.
  • the oil thus recovered is again fed back to the compressor by the oil pump 6 whereas the supernatant water automatically overflows and is discharged through an auto-drain valve (or overflow discharge valve) 7.
  • said additive being trichlorofluoromethane, and being added to said lubricating oil in an amount of 38 percent to 42 percent of the volume of said oil.
  • said additive being trichlorotrifluoroethane, and being added to said lubricating oil in an amount of 34 percent to 45 percent of the volume of said oil.
  • said additive being dichlorotetrafluoroethane, and being added to said lubricating oil in an amount of 39 percent to 41 percent of the volume of said oil.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Lubricants (AREA)
  • Compressor (AREA)
US00285872A 1972-03-29 1972-09-01 Oil recovery method for displacement rotary air compressor Expired - Lifetime US3813850A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47030686A JPS5141682B2 (enrdf_load_stackoverflow) 1972-03-29 1972-03-29

Publications (1)

Publication Number Publication Date
US3813850A true US3813850A (en) 1974-06-04

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00285872A Expired - Lifetime US3813850A (en) 1972-03-29 1972-09-01 Oil recovery method for displacement rotary air compressor

Country Status (5)

Country Link
US (1) US3813850A (enrdf_load_stackoverflow)
JP (1) JPS5141682B2 (enrdf_load_stackoverflow)
DE (1) DE2246278A1 (enrdf_load_stackoverflow)
GB (1) GB1373605A (enrdf_load_stackoverflow)
SE (1) SE381496B (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995012071A1 (en) * 1993-10-29 1995-05-04 Cash Engineering Research Pty. Ltd. Tank mounted rotary compressor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5173613A (ja) * 1974-12-23 1976-06-25 Maekawa Seisakusho Kk Gasuatsushukusochi

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3363399A (en) * 1966-09-26 1968-01-16 Air Prod & Chem Purification of oil-contaminated water
US3564863A (en) * 1968-05-14 1971-02-23 Refrigeration System Purifiers Refrigeration system purifier
US3634247A (en) * 1970-01-09 1972-01-11 Du Pont Cutting fluid composition of chlorofluoro- and nitroalkanes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3363399A (en) * 1966-09-26 1968-01-16 Air Prod & Chem Purification of oil-contaminated water
US3564863A (en) * 1968-05-14 1971-02-23 Refrigeration System Purifiers Refrigeration system purifier
US3634247A (en) * 1970-01-09 1972-01-11 Du Pont Cutting fluid composition of chlorofluoro- and nitroalkanes

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Effects of Refrigerants on Lubricating Oils Lubrication, Vol. 47, No. 7, Texaco, Inc., July 1961, pp. 78 80. *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995012071A1 (en) * 1993-10-29 1995-05-04 Cash Engineering Research Pty. Ltd. Tank mounted rotary compressor
US5697763A (en) * 1993-10-29 1997-12-16 Cash Engineering Research Pty Ltd Tank mounted rotary compressor

Also Published As

Publication number Publication date
DE2246278A1 (de) 1973-10-18
JPS5141682B2 (enrdf_load_stackoverflow) 1976-11-11
SE381496B (sv) 1975-12-08
GB1373605A (en) 1974-11-13
JPS4898415A (enrdf_load_stackoverflow) 1973-12-14

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