US3724231A - Single stage dry cylinder compressor having automatic oil drain from suction chamber to crankcase - Google Patents

Single stage dry cylinder compressor having automatic oil drain from suction chamber to crankcase Download PDF

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Publication number
US3724231A
US3724231A US00187801A US3724231DA US3724231A US 3724231 A US3724231 A US 3724231A US 00187801 A US00187801 A US 00187801A US 3724231D A US3724231D A US 3724231DA US 3724231 A US3724231 A US 3724231A
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United States
Prior art keywords
collecting tank
oil
suction chamber
crankcase
conduit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00187801A
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English (en)
Inventor
W Grant
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Copeland Industrial LP
Original Assignee
Vilter Manufacturing LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vilter Manufacturing LLC filed Critical Vilter Manufacturing LLC
Application granted granted Critical
Publication of US3724231A publication Critical patent/US3724231A/en
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Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B31/00—Compressor arrangements
    • F25B31/002—Lubrication
    • F25B31/004—Lubrication oil recirculating arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/03—Oil level

Definitions

  • ABSTRACT An automatic draining apparatus for draining the oil from a suction chamber to the crankcase of a singlestage refrigeration compressor.
  • the apparatus includes a collecting tank having a float switch, a first conduit connecting the suction chamber .in oil-draining relation with the collecting tank; a second conduit connecting the collecting tank in oil-draining relation with the crankcase; a third conduit having a first solenoid interposed therein connecting the collecting tank in equal pressure relation with the suction chamber; a fourth conduit having a second solenoid valve interposed therein connecting the collecting tank in equal pressure relation with the discharge chamberyand an electrical circuit operatively connecting the first and second solenoid valves to the float switch to automatically control the solenoid valves in response to the level of oil in the collecting tank.
  • a dry cylinder compressor is contemplated wherein the crankcase pressure and the suction chamber pressure are normally the same.
  • a simple drain arrangement cannot be used since the suction chamber must be isolated from the crankcase in order to prevent any possible oil vapors going from the crankcase into the suction chamber when system operating conditions change, i.e., whenever the crankcase pressure exceeds the suction chamber pressure.
  • the suction chamber must be isolated from the crankcase in order to prevent any possible oil vapors going from the crankcase into the suction chamber when system operating conditions change, i.e., whenever the crankcase pressure exceeds the suction chamber pressure.
  • the compressor includes a suction chamber 30, a discharge chamber 32 and a crankcase 34. Oil 36, which accumulates in the suction chamber 30, is automatically returned to the crankcase 34 by means of an automatic draining apparatus 38 of this invention.
  • the collecting tank is also connected to the suction chamber and to the discharge chamber to selectively equalize pressure between the collecting tank and the suction chamber or discharge chamber.
  • Solenoid valves are interposed in these connections which are controlled by an electric circuit to respond to the position of a float switch provided within the collecting tank. This arrangement provides gravity, flow of oil from the suction chamber to the collecting tank and pressurized flow from the collecting tank to the crankcase.
  • FIG. I is a schematic diagram of the automatic oil draining apparatus connected to a drywall cylinder type single-stage compressor.
  • FIG. 2 is an electric diagram of the circuit used to control the automatic drain apparatus shown in FIG. 1.
  • the refrigerating system of this invention generally includes a single-stage compressor 10 operatively connected in series circuit relation with a condenser 14, a
  • Means are, therefore, provided for equalizing the pressure between the suction chamber 30 and the crankcase 34 without allowing any oil vapor to flow into the suction chamber 30.
  • Such means is in the form of an equalizing line 40 operatively connected between the suction chamber 30 and the crankcase 34.
  • An oil vapor collecting device 35 is interposed in the equalizing line 40 to prevent any oil vapors from passing from the crankcase 34 into the suction chamber 30.
  • This equalizing line provides the necessary control of the pressure without any excessive transfer of oil from the crankcase 34 to the suction chamber 30.
  • the automatic draining apparatus 38 is used to allow for the flow of oil from the suction chamber 30 back to the crankcase 34 whenever a predetermined amount of oil has been collected.
  • the drain apparatus 38 includes a collecting tank 42 having a float switch 44 positioned within the tank.
  • the tank is connected to the suction chamber 30 by means of a first oil conduit 46 having a one-way check valve 48 interposed therein to prevent reverse flow of oil from the collecting tank 42 to the suction chamber 30.
  • the collecting tank 42 is connected to the crankcase by mans of a second oil conduit 50 having a one-way check valve 52 interposed therein to prevent reverse flow of oil from the crankcase 34 into the collecting tank 42.
  • Means are provided to maintain equal pressure between the suction chamber 30 and the collecting tank 42 to allow oil to flow by gravity from the suction chamber 30 into the collecting tank 42.
  • Such means is in the form of a first pressure equalizing conduit 54 connected between the suction chamber 30 and the collecting tank 42.
  • the pressure in conduit 54 is controlled by means of a first solenoid valve 56 interposed therein. When the solenoid valve 56 is open, the pressure in the suction chamber 30 and collecting tank 42 will equalize. Oil in the suction chamber 30 will be free to flow by gravity into the collecting tank 42 through conduit 46.
  • Means are provided for connecting the collecting tank 42 to the discharge chamber 32 to pressurize the collecting tank 42 and force oil from the collecting tank 42 into the crankcase 34.
  • Such means is in the form of a second pressure conduit 58 having a second solenoid valve 60 interposed therein.
  • the solenoid valves 56 and 60 are controlled by means of the electric circuit shown in FIG. 2.
  • This circuit includes the float switch 44 which is connected across the power source L1, L2 by an electric line'62 which includes a timer 64 having a timer switch 66.
  • the timer switch 66 is shown in its normally-closed position to connect the solenoid valve 56 across the power source L1, L2 by a line 68.
  • the solenoid valve 56 will be normally open and the solenoid valve 60 will be normally closed.
  • the timer 64 is actuated to move the switch 66 to a closed position with solenoid 60 and to open and deenergize solenoid 56.
  • the solenoid valve 56 will close and the solenoid valve 60 will open to pressurize the collecting tank 42.
  • float switch 44 Since the float switch 44 will open immediately after the oil level in tank 42 starts to drop, means are provided to set up a holding circuit for the timer 64. Such means is in the form of a jumper 70 connected between timer 64 and line 68. After the timer 64 has run through its preset time interval, the switch 66 will open the line to the solenoid 60 and jumper 70 to deenergize both the solenoid valve 60 and the timer 64. The solenoid 56 will be reenergized by the closing of the switch 66 to open the solenoid 56 and again equalize pressure between the suction chamber 30 and the collecting tank 42.
  • the present invention provides an automatic oilreturn system for a dry cylinder type single-stage compressor having equalized pressures between the suction chamber and crankcase.
  • the transfer of oil from the suction chamber to the collecting tank is provided by means of an oil conduit and a pressure equalizing conduit connected to allow for the gravity flow of oil from the suction chamber to the collecting tank.
  • the oil in the collecting tank is automatically pressurized by equalizing pressure between the collecting tank and the discharge chamber through a solenoid valve to force the oil therein into the crankcase.
  • Check valves are provided to prevent reverse flow through the oil conduits.
  • the solenoid valves are controlled by an electric circuit which includes a timer switch for holding the pressurizing solenoid valve open to assure flow of oil from the collecting tank to the crankcase.
  • An apparatus for automatically draining oil from the suction chamber to the crankcase of a single-stage compressor having a discharge chamber comprising:
  • a one-way check valve in said first conduit to allow fluid flow from said suction chamber to aid collecting tank
  • a first pressure conduit for equalizing pressure between said suction chamber and said collecting tank
  • a second pressure conduit for equalizing pressure between said collecting tank and said discharge chamber, means for selectively connecting one or the other of said first and second pressure conduit to said collecting tank,
  • controlling means includes a float switch
  • connecting means includes a first normally-open solenoid valve interposed in said first pressure conduit means and a second normally-closed solenoid valve interposed in said second pressure conduit means.
  • the apparatus according to claim 3 including electrical circuit means for operatively connecting said float switch to said first and second solenoid valves.
  • circuit means includes a timer switch operatively connected to open said second solenoid valve and to close said first solenoid valve for a predetermined period of time.
  • the apparatus according to claim including means for equalizing pressure between said suction chamber and said crankcase.
  • said electric circuit means includes a timer switch to control the time of opening of said second solenoid valve.
US00187801A 1971-10-08 1971-10-08 Single stage dry cylinder compressor having automatic oil drain from suction chamber to crankcase Expired - Lifetime US3724231A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US18780171A 1971-10-08 1971-10-08

Publications (1)

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US3724231A true US3724231A (en) 1973-04-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00187801A Expired - Lifetime US3724231A (en) 1971-10-08 1971-10-08 Single stage dry cylinder compressor having automatic oil drain from suction chamber to crankcase

Country Status (5)

Country Link
US (1) US3724231A (fr)
JP (1) JPS5334326B2 (fr)
AU (1) AU450119B2 (fr)
FR (1) FR2155650A5 (fr)
IT (1) IT965484B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5193358A (en) * 1989-03-30 1993-03-16 Winther Aage Bisgaard Compression cooling plant provided with an oil separator
US20060101845A1 (en) * 2004-11-18 2006-05-18 Lg Electronics Inc. Compressor oil recovering apparatus and multi-unit air conditioner equiped with the same
EP3034964A1 (fr) * 2014-12-19 2016-06-22 Mitsubishi Heavy Industries, Ltd. Unité de compresseur, compresseur et circuit de réfrigérant
US11002277B2 (en) 2018-03-27 2021-05-11 Ingersoll-rand Industrial U.s. Inc. Compressor system and system for maintaining a desired oil level

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0423022Y2 (fr) * 1986-05-21 1992-05-27
JPH045343Y2 (fr) * 1986-07-26 1992-02-14

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2978877A (en) * 1958-08-04 1961-04-11 Vilter Mfg Co Hot gas defrosting system with gravity liquid return for refrigeration systems
US3494137A (en) * 1968-06-12 1970-02-10 George K Cargo Fluid-operated pump and refrigerant system containing the same
US3500962A (en) * 1969-05-01 1970-03-17 Vilter Manufacturing Corp Lubrication system for compressors
US3543880A (en) * 1969-07-07 1970-12-01 Vilter Manufacturing Corp Two stage refrigeration compressor having automatic oil drain for the first stage suction chamber

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2978877A (en) * 1958-08-04 1961-04-11 Vilter Mfg Co Hot gas defrosting system with gravity liquid return for refrigeration systems
US3494137A (en) * 1968-06-12 1970-02-10 George K Cargo Fluid-operated pump and refrigerant system containing the same
US3500962A (en) * 1969-05-01 1970-03-17 Vilter Manufacturing Corp Lubrication system for compressors
US3543880A (en) * 1969-07-07 1970-12-01 Vilter Manufacturing Corp Two stage refrigeration compressor having automatic oil drain for the first stage suction chamber

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5193358A (en) * 1989-03-30 1993-03-16 Winther Aage Bisgaard Compression cooling plant provided with an oil separator
US20060101845A1 (en) * 2004-11-18 2006-05-18 Lg Electronics Inc. Compressor oil recovering apparatus and multi-unit air conditioner equiped with the same
EP1659350A1 (fr) * 2004-11-18 2006-05-24 LG Electronics Inc. Récupérateur d'huile pour compresseur et climatiseur à unités multiples comprenant celui-ci
EP3034964A1 (fr) * 2014-12-19 2016-06-22 Mitsubishi Heavy Industries, Ltd. Unité de compresseur, compresseur et circuit de réfrigérant
US11002277B2 (en) 2018-03-27 2021-05-11 Ingersoll-rand Industrial U.s. Inc. Compressor system and system for maintaining a desired oil level

Also Published As

Publication number Publication date
AU450119B2 (en) 1974-06-27
AU4694372A (en) 1974-03-28
JPS5334326B2 (fr) 1978-09-20
FR2155650A5 (fr) 1973-05-18
JPS4845914A (fr) 1973-06-30
IT965484B (it) 1974-01-31

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