US20130177404A1 - Compression device, and a thermodynamic system comprising such a compression device - Google Patents

Compression device, and a thermodynamic system comprising such a compression device Download PDF

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Publication number
US20130177404A1
US20130177404A1 US13/732,847 US201313732847A US2013177404A1 US 20130177404 A1 US20130177404 A1 US 20130177404A1 US 201313732847 A US201313732847 A US 201313732847A US 2013177404 A1 US2013177404 A1 US 2013177404A1
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United States
Prior art keywords
compressor
oil
conduit
compression device
orifice
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Abandoned
Application number
US13/732,847
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English (en)
Inventor
Jean Bernardi
Patrice Bonnefoi
Xavier DURAND
Fabien GALL
Jean-Francois LE COAT
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Danfoss Commercial Compressors SA
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Danfoss Commercial Compressors SA
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Publication date
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Publication of US20130177404A1 publication Critical patent/US20130177404A1/en
Abandoned legal-status Critical Current

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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
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/001—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids of similar working principle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/02—Lubrication
    • F04B39/0207—Lubrication with lubrication control systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/02—Lubrication
    • F04B39/0223—Lubrication characterised by the compressor type
    • F04B39/023—Hermetic compressors
    • F04B39/0238—Hermetic compressors with oil distribution channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
    • F04B39/121—Casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B41/00—Pumping installations or systems specially adapted for elastic fluids
    • F04B41/06—Combinations of two or more pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/02—Stopping, starting, unloading or idling control
    • 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
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/008—Hermetic pumps
    • 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
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/02—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids specially adapted for several pumps connected in series or in parallel
    • 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
    • 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
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/24—Level of liquid, e.g. lubricant or cooling liquid
    • 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
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/02—Centrifugal separation of gas, liquid or oil
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/07—Details of compressors or related parts
    • F25B2400/075—Details of compressors or related parts with parallel compressors

Definitions

  • the present invention relates to a compression device, and to a thermodynamic system comprising such a compression device.
  • thermodynamic system and more particularly a cooling system, comprising:
  • thermodynamic system ensures return of the major portion of the oil carried away by the coolant fluid towards the first compressor. Because of the high pressure prevailing in the low pressure portion of the first compressor (due to the presence of the restriction member in the second suction line), the oil present in the oil pan of the first compressor is driven towards the oil pan of the second compressor, via the oil level equalization conduit, so as to balance the oil levels in the first and second compressors.
  • thermodynamic system including two fixed-capacity compressors having close capacities
  • thermodynamic system including at least one compressor with variable capacity and more particularly with variable speed, or two fixed-capacity compressors having very different capacities.
  • the present invention aims at finding a remedy to these drawbacks.
  • the technical problem at the basis of the invention therefore consists of providing a compression device which is of a simple and economical structure, with which balancing of the oil levels may be obtained in each compressor regardless of the operating conditions of the compression device, and regardless of the type of compressors used.
  • the present invention relates to a compression device comprising:
  • the compression device further comprises:
  • an oil separator on the suction line or on the second suction conduit gives the possibility of ensuring, regardless of the operating conditions of the compression device, and regardless of the type of compressors used, a return of the major portion of the oil driven by the coolant fluid towards the first compressor via the oil return conduit.
  • the oil present in the oil pan of the first compressor is then driven towards the oil pan of the second compressor, via the oil level equalization conduit, so as to balance the oil levels in the first and second compressors.
  • the compression device according to the invention therefore ensures balancing of the oil levels in each compressor regardless of the operating conditions of the compression device, and regardless of the type of compressors used, the whole only by means of a low cost oil separator. Further, the compression device according to the invention ensures the presence of a minimum amount of oil in the oil pan of the first compressor.
  • the oil separator further comprises an inlet orifice intended to be connected to the outlet of the evaporator so as to allow an oil-coolant fluid mixture to be introduced into the oil separator, and a coolant fluid discharge orifice connected to at least the admission orifice of the second compressor.
  • the oil separator comprises a separation chamber, the inlet orifice and the coolant fluid discharge orifice of the oil separator being respectively in communication with the separation chamber.
  • the inlet orifice of the oil separator is thus intended to be connected to the outlet of the evaporator so as to allow an oil-coolant fluid mixture to be introduced in the separation chamber.
  • the suction line comprises a first connection conduit connected to the inlet orifice of the oil separator and intended to be connected to the outlet of the evaporator, and a second connection conduit arranged for putting the coolant fluid discharge orifice of the oil separator in communication with the first and second suction conduits.
  • the first and second connection conduits for example have substantially identical diameters.
  • the first connection conduit is arranged so as to extend from the outlet of the evaporator as far as the inlet orifice of the oil separation device.
  • the second connection conduit extends from the coolant fluid discharge orifice of the oil separator as far as a diversion point
  • the first suction conduit extends from the diversion point as far as the admission orifice of the first compressor
  • the second suction conduit extends from the diversion point as far as the admission orifice of the second compressor.
  • the second connecting conduit protrudes inside the separation chamber.
  • the second suction conduit comprises an upstream conduit portion arranged for putting the inlet orifice of the oil separator in communication with the suction line, and a downstream conduit portion arranged for putting the coolant fluid discharge orifice of this oil separator in communication with the admission orifice of the second compressor.
  • the downstream conduit portion protrudes inside the separation chamber.
  • the suction line is arranged so as to extend from the outlet of the evaporator as far as a diversion point
  • the first suction conduit extends from the diversion point as far as the admission orifice of the first compressor
  • the upstream conduit portion extends from the diversion point as far as the inlet orifice of the oil separator
  • the downstream conduit portion extends from the coolant fluid discharge orifice of the oil separator as far as the admission orifice of the second compressor.
  • the oil return conduit is arranged for opening into the first suction conduit. According to another embodiment of the invention, the oil return conduit is arranged for opening into the oil pan of the first compressor.
  • the second suction conduit comprises restriction means arranged for reducing the flow section of the coolant fluid in the second suction conduit.
  • the restriction means are preferentially arranged for maintaining pressure in the low pressure portion of the first compressor, greater than the pressure in the low pressure portion of the second compressor when the first and second compressors are operating simultaneously.
  • the restriction means are arranged so that the flow section of the coolant fluid at the restriction means is less than the flow section of the coolant fluid at the admission orifice of the second compressor.
  • the restriction means for example include a restriction member positioned in the second suction conduit.
  • the first compressor is a variable-capacity compressor and the second compressor is a fixed-capacity compressor.
  • compressor with variable capacity any compressor which may have a variable output (or several outputs) with regard to the suction of the compressor for a same operating point (an operating point corresponding to a suction pressure, a suction temperature and a discharge pressure which are given).
  • a compressor with variable capacity any compressor which may have a variable output (or several outputs) with regard to the suction of the compressor for a same operating point (an operating point corresponding to a suction pressure, a suction temperature and a discharge pressure which are given).
  • the first and second compressors may be fixed-capacity compressors.
  • the first and second fixed-capacity compressors may for example have different capacities.
  • the oil separator is a cyclone oil separator.
  • the oil level equalization conduit includes at least one first end portion protruding inside the enclosure of one of the first and second compressors, the first end portion including an end wall extending transversely to the longitudinal direction of said first end portion and an aperture made above said end wall so that, when the oil level in the oil pan of the compressor into which the first end portion protrudes, extends above the upper level of said end wall, oil flows through said aperture towards the other compressor.
  • the first end portion protrudes inside the enclosure of the second compressor.
  • the oil level equalization conduit advantageously includes a second end portion protruding inside the enclosure of the other one of the first and second compressors, the second end portion including an end wall extending transversely to the longitudinal direction of said second end portion and an aperture made above the end wall of said second end portion so that, when the oil level in the oil pan of the compressor, into which protrudes the second end portion, extends above the upper level of the end wall of the second end portion, oil flows through the aperture of the second end portion towards the other compressor.
  • At least one of the first and second end portions includes an oil return orifice located below the upper level of the end wall of said end portion.
  • Each of the first and second compressors is for example a compressor with scrolls.
  • FIG. 1 is a schematic view of a thermodynamic system according to a first embodiment of the invention.
  • FIG. 2 is a schematic sectional view of a compression device of the thermodynamic system of FIG. 1 .
  • FIGS. 3 a and 3 b are perspective and top views respectively of an end portion of an oil level equalization conduit of the compression device of FIG. 2 .
  • FIG. 4 is a schematic view of a thermodynamic system according to a second embodiment of the invention.
  • FIG. 5 schematically illustrates the main components of a thermodynamic system 1 .
  • the thermodynamic system 1 may be a cooling system.
  • the thermodynamic system 1 comprises a circuit 2 for circulating a coolant fluid successively including a condenser 3 , an expansion valve 4 , an evaporator 5 and a compression device 6 connected in series.
  • the compression device 6 comprises a first compressor 7 with variable capacity, and more particularly with variable speed, and a second compressor 8 with fixed capacity, and more particularly with a fixed speed, mounted in parallel.
  • Each compressor 7 , 8 is for example a compressor with scrolls.
  • Each compressor 7 , 8 comprises a body 9 including a low pressure portion 11 containing a motor 12 and an oil pan 13 positioned in the bottom of the body 9 , and a high pressure portion 14 , positioned above the low pressure portion 11 , containing a compression stage.
  • each compressor 7 , 8 further includes an orifice 15 for admitting coolant fluid, opening into an upper portion of the low pressure portion 11 , an equalization orifice 16 opening into the oil pan 13 , and a discharge orifice 17 opening into the high pressure portion 14 .
  • the compression device 6 also comprises a suction line 19 connected to the evaporator 5 , a first suction conduit 21 putting the suction line 19 in communication with the admission orifice 15 of the first compressor 7 , and a second suction conduit 22 putting the suction line 19 in communication with the admission orifice 15 of the second compressor 8 .
  • Each suction conduit 21 , 22 comprises a suction tube 21 a, 22 a, connected to the suction line 19 and a connecting sleeve 21 b, 22 b connected to the corresponding admission orifice 15 , respectively.
  • the second suction conduit 22 comprises restriction means arranged for reducing the flow section of the coolant fluid in said suction conduit.
  • the restriction means are arranged so that the flow section of the coolant fluid at the restriction means is less than the flow section of the coolant fluid at the admission orifice 15 of the second compressor 8 .
  • the restriction means are advantageously positioned in proximity to the admission orifice 15 of the second compressor 8 .
  • the restriction means preferably comprise an annular ring 23 attached in the second suction conduit 22 , for example by brazing or crimping.
  • the annular ring 23 includes a longitudinal through-orifice centered with respect to the wall of the second suction conduit 22 . It should be noted that the outer diameter of the annular ring 23 substantially corresponds to the inner diameter of the diversion tube 22 a of the second suction conduit 22 .
  • the annular ring 23 may be attached in the connecting sleeve 22 b of the second suction conduit 22 .
  • the compression device 6 further comprises an oil level equalization conduit 24 connecting the first equalization orifices 16 of the first and second compressors 7 , 8 and in fact putting the oil pans 13 of the first and second compressors in communication.
  • the compression device 6 also comprises a discharge line 26 connected to the condenser 3 , a first discharge conduit 27 putting the discharge line 26 in communication with the discharge orifice 17 of the first compressor 7 , and a second discharge conduit 28 putting the discharge line 26 in communication with the discharge orifice 17 of the second compressor 8 .
  • the compression device 6 further comprises control means 29 arranged for selectively controlling the respective switching of the first and second compressors 7 , 8 between an operating mode and a standstill mode, on the one hand, and for modulating the speed of the motor 12 of the first compressor 7 between a minimum speed and a maximum speed on the other hand.
  • the compression device 6 also comprises an oil separator 31 mounted on the suction line 19 .
  • the oil separator 31 includes a body 32 delimiting a separation chamber 34 .
  • the separation chamber 34 includes a cylindrical upper portion extended with a converging frusto-conical lower portion opposite to the upper portion.
  • the oil separator 31 thus forms a cyclone oil separator.
  • the oil separator 31 also comprises an inlet orifice 35 for example opening radially or tangentially into the separation chamber 34 , an oil outflow orifice 36 opening into the lower end of the separation chamber 34 , and an orifice for discharging coolant fluid 37 , opening axially into the upper end of the separation chamber 34 .
  • the suction line 19 more particularly comprises a first connecting conduit 19 a connected to the outlet of the evaporator 5 on the one hand and to the inlet orifice 35 of the oil separator 31 on the other hand so as to allow an oil-coolant fluid mixture to be introduced into the separation chamber 34 , and a second connecting conduit 19 b connected to the discharge orifice 37 of the oil separator 31 on the one hand and to the first and second suction conduits 21 , 22 on the other hand.
  • the first and second connecting conduits 19 a, 19 b for example have substantially identical diameters.
  • the second connecting conduit 19 b protrudes inside the separation chamber 34 .
  • the second connecting conduit 19 b preferably extends from the discharge orifice 37 of the oil separator 31 as far as a diversion point 38 , and the first and second suction conduits 21 , 22 respectively extend from the diversion point 38 as far as the admission orifice 15 of the respective compressor.
  • the compression device 6 finally comprises an oil return conduit 39 arranged for connecting the oil outflow orifice 36 of the oil separator 31 to the oil pan 13 of the first compressor 7 .
  • the oil return conduit 39 is more particularly arranged for opening into the first suction conduit 21 .
  • thermodynamic system 1 The operation of the thermodynamic system 1 will now be described.
  • the oil-coolant fluid mixture from the evaporator 5 penetrates into the separation chamber 34 of the oil separator 31 via the first connecting conduit 19 a and the inlet orifice 35 . Subsequently, because of the configuration of the separation chamber 34 , the oil-coolant fluid mixture begins to turn along the internal wall of the separation chamber 34 , which causes centrifugation of the oil-coolant fluid mixture. The result of this is the coalescence of the oil drops on the internal wall of the separation chamber 34 , and then the fall of the oil by gravity towards the lower end of the separation chamber 34 , i.e.
  • the oil separated in the separation chamber 34 then flows in the oil return conduit 39 towards the oil pan 13 of the first compressor 7 via the first suction conduit 21 .
  • the coolant fluid flow penetrating into the first compressor 7 is then highly loaded with oil. Because of the high pressure prevailing in the low pressure portion 11 of the first compressor 7 (due to the presence of the restriction member 23 in the second suction conduit 22 ), the oil present in the oil pan 13 of the first compressor 7 is driven towards the oil pan 13 of the second compressor 8 , via the oil level equalization conduit 24 , so as to balance the oil levels in the first and second compressors 7 , 8 .
  • the oil level equalization conduit 24 includes at least one first end portion 41 protruding inside one of the first and second compressors 7 , 8 .
  • the first end portion 41 includes an end wall 42 extending transversely to the longitudinal direction of the first end portion 41 and an aperture 43 made above the end wall 42 so that, when the oil level in the oil pan 13 of the compressor into which protrudes the first end portion 41 , extends above the upper level of the end wall 42 , oil flows through the aperture 43 towards the other compressor.
  • each aperture 43 extends over a portion of the side wall 44 of the corresponding end portion 41 .
  • the first end portion 41 further includes an oil return orifice 45 located below the upper level of the end wall 42 of the first end portion 41 . This position of the oil return orifice 45 gives the possibility of avoiding storage of oil beyond a predetermined level inside the enclosure of the compressor into which protrudes the first end portion 41 .
  • the oil level equalization conduit 24 includes a second end portion 41 substantially identical with the first end portion, the first end portion 41 protruding inside one of the first compressors 7 , 8 , while the second end portion 41 protrudes inside the other one of the first and second compressors 7 , 8 .
  • FIGS. 4 and 5 illustrate a thermodynamic system 1 according to a second embodiment of the invention which differs from the one illustrated in FIGS. 1 and 2 essentially in that the oil separator 31 is mounted on the second suction conduit 22 , in that the second suction conduit 22 comprises an upstream conduit portion 46 a arranged for putting the inlet orifice 35 of the oil separator 31 in communication with the suction line 19 , and a downstream conduit portion 46 b arranged for putting the discharge orifice 37 of the oil separator 31 in communication with the admission orifice 15 of the second compressor 8 , and in that the oil return conduit 39 directly opens into the oil pan 13 of the first compressor 7 .
  • the suction line 19 extends from the outlet of the evaporator 5 as far as the diversion point 38
  • the first suction conduit 21 extends from the diversion point 38 as far as the admission orifice 15 of the first compressor 7
  • the upstream conduit portion 46 a extends from the diversion point 38 as far as the inlet orifice 35 of the oil separator 31
  • the downstream conduit portion 46 b extends from the discharge orifice 37 of the oil separator 31 as far as the admission orifice 15 of the second compressor 8 .
  • the downstream conduit portion 46 b protrudes inside the separation chamber 34 .
  • the downstream conduit portion 46 b comprises restriction means, and more particularly the annular ring 23 .
  • the second suction conduit 22 may be without any restriction means in order to limit the manufacturing costs of the compression device.
  • the oil separator according to this alternative embodiment is arranged for maintaining pressure in the low pressure portion of the first compressor, greater than the pressure in the low pressure portion of the second compressor when the first and second compressors are operating simultaneously.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Compressor (AREA)
US13/732,847 2012-01-11 2013-01-02 Compression device, and a thermodynamic system comprising such a compression device Abandoned US20130177404A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR12/50271 2012-01-11
FR1250271A FR2985552A1 (fr) 2012-01-11 2012-01-11 Systeme thermodynamique

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US20130177404A1 true US20130177404A1 (en) 2013-07-11

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CN (1) CN103206359A (de)
DE (1) DE102013000189A1 (de)
FR (1) FR2985552A1 (de)

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US20170016438A1 (en) * 2015-07-14 2017-01-19 Danfoss (Tianjin) Ltd. Compressor system
US20170176074A1 (en) * 2015-12-17 2017-06-22 Trane International Inc. Suction conduit flow control for lubricant management
CN107923403A (zh) * 2015-08-11 2018-04-17 艾默生环境优化技术有限公司 具有油平衡系统的多压缩机配置
EP3767202A1 (de) * 2019-07-19 2021-01-20 Trane International Inc. System und verfahren zur steuerung der schmiermitteltrennung und -rückführung
US11215370B2 (en) * 2014-11-21 2022-01-04 Yanmar Power Technology Co., Ltd. Heat pump
US11713760B2 (en) 2017-12-28 2023-08-01 Emerson Climate Technologies (Suzhou) Co., Ltd. Intake pipe used for compressor system and compressor system
WO2024039434A1 (en) * 2022-08-19 2024-02-22 Emerson Climate Technologies, Inc. Multiple-compressor system with oil balance control

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DE102016011506A1 (de) * 2016-09-21 2018-03-22 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Schraubenkompressor für ein Nutzfahrzeug
CN108548343A (zh) * 2018-03-30 2018-09-18 南通托贝铒智能控制设备有限公司 多台制冷压缩机组并联组合的冷却油液装置
JP7125637B1 (ja) * 2021-03-16 2022-08-25 ダイキン工業株式会社 圧縮装置及び冷凍装置

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US10386103B2 (en) * 2015-12-17 2019-08-20 Trane International Inc. Suction conduit flow control for lubricant management
US11112157B2 (en) * 2015-12-17 2021-09-07 Trane International Inc. Suction conduit flow control for lubricant management
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EP3767202A1 (de) * 2019-07-19 2021-01-20 Trane International Inc. System und verfahren zur steuerung der schmiermitteltrennung und -rückführung
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DE102013000189A1 (de) 2013-07-11
FR2985552A1 (fr) 2013-07-12

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