EP4283123A1 - Unité de compresseur de réfrigérant - Google Patents

Unité de compresseur de réfrigérant Download PDF

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Publication number
EP4283123A1
EP4283123A1 EP23172264.6A EP23172264A EP4283123A1 EP 4283123 A1 EP4283123 A1 EP 4283123A1 EP 23172264 A EP23172264 A EP 23172264A EP 4283123 A1 EP4283123 A1 EP 4283123A1
Authority
EP
European Patent Office
Prior art keywords
lubricant
refrigerant compressor
compressor unit
engine compartment
unit according
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.)
Pending
Application number
EP23172264.6A
Other languages
German (de)
English (en)
Inventor
Jens Moch
Axel Friedrich
Andreas Becker
Steffen Schramm
Carsten Strobach
Dirk MANNEWITZ
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.)
Bitzer Kuehlmaschinenbau GmbH and Co KG
Original Assignee
Bitzer Kuehlmaschinenbau GmbH and Co KG
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 Bitzer Kuehlmaschinenbau GmbH and Co KG filed Critical Bitzer Kuehlmaschinenbau GmbH and Co KG
Publication of EP4283123A1 publication Critical patent/EP4283123A1/fr
Pending legal-status Critical Current

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Classifications

    • 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
    • F25B31/02—Compressor arrangements of motor-compressor units
    • F25B31/023—Compressor arrangements of motor-compressor units with compressor of reciprocating-piston type
    • 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
    • F04B39/0284—Constructional details, e.g. reservoirs in the casing
    • 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
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
    • 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
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/04—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • 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
    • F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
    • F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
    • F04B37/12—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use to obtain high pressure
    • 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
    • F04B39/0261—Hermetic compressors with an auxiliary oil pump
    • 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
    • F04B39/06—Cooling; Heating; Prevention of freezing
    • F04B39/062—Cooling by injecting a liquid in the gas to be compressed
    • 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
    • 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
    • F04B39/123—Fluid connections
    • 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
    • F04B39/128—Crankcases
    • 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

Definitions

  • the invention relates to a refrigerant compressor unit, comprising a piston compressor driven by a drive motor and an overall housing with a housing body, which forms a drive housing section with a drive chamber for the piston compressor and forms a motor housing section with a motor compartment for receiving the drive motor, the engine compartment being supplied by a piston compressor Refrigerant flows through, so that a lubricant sump is formed on the bottom of the engine compartment, from which lubricant is sucked out by means of a suction unit and transferred to a lubricant bath in the drive compartment.
  • Such a refrigerant compressor unit is, for example, from DE 2 250 947 known.
  • the invention is therefore based on the object of improving a refrigerant compressor of the type described in the introduction in such a way that reliable suction of lubricant from the lubricant sump is ensured even when a longitudinal direction of the refrigerant compressor unit is inclined relative to a horizontal course of the longitudinal direction in order to avoid excessive accumulation of lubricant in the lubricant sump.
  • a receiving point is provided on the bottom of the engine compartment, which is designed in such a way that that it absorbs lubricant from the lubricant sump and supplies it to the suction unit, particularly when the refrigerant compressor unit is inclined relative to a starting position, which lies within an inclination tolerance range.
  • the suction unit is designed such that a suction channel of the suction unit extends into the receiving point.
  • the receiving point is preferably designed in such a way that it is designed as a depression relative to its bottom surroundings, in which case in particular the suction channel of the suction unit extends to a deepest point of the depression.
  • the receiving point is arranged in the engine compartment in such a way that when the refrigerant compressor unit is tilted such that an axis of rotation of a compressor shaft relative to a horizontal orientation in the starting position lies within an inclination tolerance range of ⁇ 15 °, the lubricant sump extends up to the receiving point extends and lubricant from the lubricant sump enters it.
  • the receiving point is arranged in a bottom area of the engine compartment, which extends from an intermediate wall separating the engine compartment from the drive compartment to under an area of the stator facing the intermediate wall and in particular up to a maximum of half the extent of the stator in the longitudinal direction .
  • Such a location of the receiving point enables sufficiently reliable suction of lubricant from the lubricant sump even when the refrigerant compressor unit is tilted.
  • the receiving point is arranged at a distance from the intermediate wall, in particular offset in the direction of the stator. It is particularly favorable if the receiving point lies between the intermediate wall and a stator sheet metal body comprising pole pieces of the stator.
  • the receiving point can be formed particularly advantageously on the bottom side of the engine compartment if it is arranged in the direction of gravity below the winding heads of the stator facing the intermediate wall.
  • the suction of lubricant from the lubricant sump can be designed to be particularly expedient if the receiving point is formed in a recess relative to a floor surface of the engine compartment.
  • a particularly advantageous solution provides that the receiving point is formed on a base body of the motor housing section.
  • the receiving point is formed into the base body.
  • the base body is provided with a shape running in the direction of a support surface of the housing body to form the receiving point.
  • the amount of lubricant in the lubricant sump can be limited in that the lubricant sump is limited in the direction of a housing cover that closes the engine compartment and is opposite the drive compartment by an end wall arranged between the stator and the housing cover, so that the lubricant sump is doesn't even extend to the housing cover.
  • the lubricant sump can also be limited by arranging a lubricant displacement body between the stator and the housing cover, which reduces the volume of the lubricant sump due to its volume expansion.
  • the lubricant displacement body is held on the housing cover and preferably extends from the housing cover in the direction of the stator.
  • a particularly simple solution provides that the lubricant displacement body is molded onto the housing cover, so that it can easily reduce the volume available to the lubricant sump between the stator and the housing cover in the bottom area of the engine compartment.
  • the lubricant displacement body forms the end wall.
  • the refrigerant compressor unit 10 shown comprises an overall housing, designated 12 as a whole, which extends in a longitudinal direction 14.
  • the overall housing 12 includes a housing body 16, which also extends in the longitudinal direction 14 and carries a first front cover 22 on a first end face and a second front cover 24 on a second end face, which, for example, still has on its side facing away from the housing body 16 is provided with a flange surface 26 for mounting a frequency converter 28.
  • the housing body 16 includes, as in Fig. 2 and 3 shown, a drive housing section 32 of a piston compressor designated as a whole by 40, the drive housing section 32 enclosing a drive space 34 which extends between the first front cover 22 and an intermediate wall 36 of the housing body 16, which extends between the drive housing section 32 and a motor housing section 42 of the central Housing body 16 is located.
  • the motor housing section 42 for accommodating an electric motor 50 comprises a motor compartment 44, which in turn lies between the intermediate wall 36 and the second front cover 24, with the motor compartment 44 also extending from the motor housing section 42 into the second front cover 24.
  • the electric motor designated as a whole by 50, which includes a stator 52 arranged in the engine compartment 44 and a rotor 54 enclosed by the stator 52, the rotor 54 being rotatable about an axis of rotation 56.
  • the rotor 54 sits on a compressor shaft of the piston compressor 40, designated as a whole by 60, which carries the rotor 54 with a rotor carrier section 62 extending in the engine compartment 44 and supports it rotatably about the axis of rotation 56.
  • the compressor shaft 60 also extends into the drive chamber 34 and has a drive section 64 passing through the drive chamber 34 and carrying several eccentrics 66.
  • the compressor shaft 60 is in turn rotatably mounted in the overall housing 12 in a bearing receptacle 72 provided on the intermediate wall 36 and in a bearing receptacle 74 provided on the first front cover 22, so that the drive section 64 with the eccentrics 66 lies between the bearing receptacles 72 and 74, while the rotor carrier section 62 extends from the bearing holder 72 with a free end in the engine compartment 44.
  • the drive section 64 of the compressor shaft 60 with its eccentrics 66 serves to drive a plurality of cylinders 82 of the piston compressor 40, which are arranged, for example, in the form of two cylinder banks 84 and 86 in the drive housing section 32, each of the cylinders 82 having a cylinder space 92 in which a piston 94 is movable in a stroke direction 96, and for example each cylinder chamber 92 is enclosed by a cylinder liner 98 seated in the drive housing section 32.
  • Each of the pistons 94 is in turn driven by a connecting rod 102, which on the one hand is articulated on the piston 94 and on the other hand encloses one of the eccentrics 66.
  • each of the cylinder banks 84 and 86 are closed by a valve plate 104 and 106, respectively, the respective valve plate 104 or 106 carrying a cylinder head 112 or 114 on its side facing away from the respective cylinder space 92.
  • the cylinder head 112 is assigned to the first cylinder bank 84 and the cylinder head 114 is assigned to the second cylinder bank 86.
  • each of the valve plates 104, 106 and each of the cylinder heads 112 and 114 extend over all of the cylinder spaces 92 of the cylinders 82 of the respective cylinder bank 84 and 86.
  • the refrigerant compressor unit 10 works with the two cylinder banks 84 and 86 as a two-stage compressor, that is to say that refrigerant sucked in by the cylinders 82 of the first cylinder bank 84 forming a low-pressure stage via a suction connection 122 at suction pressure PS is first compressed to an intermediate pressure PZ, then either flows into the engine compartment 44 through a channel in the housing body 16 or via an external line 124, flows through the engine compartment 44 and from there enters an intermediate pressure channel 126 of the drive housing section 32, so that the refrigerant at intermediate pressure PZ flows into the suction chamber of the cylinder head 114 of the Cylinder bank 86 can enter and is ultimately compressed to high pressure PH by the cylinders 82 of the second cylinder bank 86 forming a high pressure stage, wherein the refrigerant under high pressure PH can then exit from a high pressure connection 128.
  • a lubricant supply unit 130 is provided in the first front cover 22 ( Fig. 3 ), which consists of a lubricant bath 132 arranged in the drive chamber 34 via a lubricant bath 132 in this arranged filter 134 and a receiving channel 136 running in the first cover 22 introduces lubricant by means of a pump unit 138, which is arranged, for example, on the first bearing cover 22 and in particular is assigned to the bearing receptacle 74, into a compressor shaft channel 142 which preferably runs coaxially to the axis of rotation 56 in the compressor shaft 60, whereby the compressor shaft channel 142 runs from the bearing receptacle 74 to the bearing receptacle 72 and from the compressor shaft channel 142 in the area of the bearing receptacle 72 in the area of the intermediate wall 36 a transverse channel 144 leads to a receptacle 146 provided in the bearing receptacle 72 and running around the compressor shaft 60, from which in turn a
  • the suction unit 150 further comprises - if necessary - a check valve 156 arranged on the suction side with the ejector 154 and arranged in the intermediate wall 36 and a suction channel 158 guided from the check valve 156 into the engine compartment 44, so that the suction unit 150 is able to extract lubricant from the engine compartment 44, which flows through the check valve 156 and is fed from the ejector 154 to the lubricant bath 132 in the drive chamber 34, as shown, for example, in the DE 2 250 947 is described.
  • the suction channel 158 can be formed by a piece of pipe or - as shown - by a hole on the bottom.
  • refrigerant flows through the engine compartment 44 and, since the refrigerant, especially when it comes from the low-pressure stage, carries lubricant with it, the lubricant settles as it flows through the engine compartment 44 in the form of a lubricant sump 162 on the bottom side of the engine compartment 44 Engine compartment 44 and is transferred into the lubricant bath 132 of the drive compartment 34 with the help of the suction unit 150.
  • a receiving point 164 is provided on the bottom side of the engine compartment 44, which is designed such that it introduces lubricant from the lubricant sump 162 into the suction unit 150, in particular its suction channel 158.
  • the position of the receiving point 164 is selected in the illustrated embodiment so that the refrigerant compressor unit 10 can also be operated in a state in which the axis of rotation 56 does not run horizontally, but can run at an angle of ⁇ 15 ° relative to the horizontal orientation, as in Fig. 4 and Fig. 5 shown.
  • the receiving point 164 is preferably located between the intermediate wall 36 and a stator sheet metal body 174 of the stator 52 comprising pole pieces of the stator 52, in particular in an area of the engine compartment 44 in which winding heads 176 of the stator 52 lie and thus below these winding heads 176.
  • the bottom surface 166 is formed by a bottom body 182 of the motor housing section 42 and the recess 184 is formed in the bottom body 182 to form the receiving point 164.
  • the base body 182 is preferably provided with a formation 186 running in the direction of a support surface 188 of the housing body 16.
  • An improvement in the inclination tolerance is also achieved by limiting the amount of lubricant in the lubricant sump 162 and for this purpose an end wall 192 which rises above the bottom surface 166 is preferably provided between the stator 52 and the second bearing cover 24 and extends transversely to the longitudinal direction 14 over a width of the engine compartment 44 and in particular up to a height above the bottom surface 166 which extends at least a height of a surface 194 of the lubricant sump 162 when the refrigerant compressor unit is tilted so that the second bearing cap 24 is lower than the first bearing cap 22 ( Fig. 4 ) corresponds.
  • the end wall 192 is preferably close to the winding heads 196 of the stator 52 facing the second bearing cover 24.
  • the end wall 192 is held on the second bearing cover 24, in particular integrally formed thereon.
  • end wall 192 is part of a lubricant displacement body 198 which projects into the engine compartment 44 between the stator 52 and the second bearing cover 24 and is preferably arranged on the second bearing cover 24 in order to reduce the lubricant volume in the engine compartment 44.
  • the lubricant displacement body 198 is also provided on the bottom side with a drain channel 202, through which condensate collecting inside the lubricant displacement body 198 can flow away.
  • the second bearing cover 26 is preferably also provided with cooling fins 204 projecting into the engine compartment 44, which extend from a bearing cover wall 206 adjacent to the frequency converter 28 in the direction of the electric motor 50 in order to also cool the frequency converter 28 via the refrigerant flowing through the engine compartment 44 .
  • the cooling fins 204 extend from the bearing cap rear wall 206 so far in the direction of the electric motor 50 that their ends 208 extend at approximately the same distance from the bearing cap rear wall 206 as the end wall 192.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Compressor (AREA)
  • Rotary Pumps (AREA)
EP23172264.6A 2022-05-24 2023-05-09 Unité de compresseur de réfrigérant Pending EP4283123A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102022113123.8A DE102022113123A1 (de) 2022-05-24 2022-05-24 Kältemittelverdichtereinheit

Publications (1)

Publication Number Publication Date
EP4283123A1 true EP4283123A1 (fr) 2023-11-29

Family

ID=86330835

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23172264.6A Pending EP4283123A1 (fr) 2022-05-24 2023-05-09 Unité de compresseur de réfrigérant

Country Status (5)

Country Link
US (1) US20230384003A1 (fr)
EP (1) EP4283123A1 (fr)
CN (1) CN116498521A (fr)
BR (1) BR102023009868A2 (fr)
DE (1) DE102022113123A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2250947A1 (de) 1972-10-18 1974-05-02 Bitzer Kuehlmaschinenbau Kg Verdichter fuer kaeltemaschinen
KR20070121321A (ko) * 2006-06-22 2007-12-27 주식회사 한두아이펨 엔진개조형 냉매압축기 및 이를 구비하는 냉난방장치
DE102013203268A1 (de) * 2013-02-27 2014-08-28 Bitzer Kühlmaschinenbau Gmbh Kältemittelverdichteranlage
EP3657017A1 (fr) * 2018-11-22 2020-05-27 BITZER Kühlmaschinenbau GmbH Compresseur frigorifique

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58118280U (ja) 1982-02-08 1983-08-12 ダイキン工業株式会社 密閉型圧縮機
US11655820B2 (en) 2020-02-04 2023-05-23 Aspen Compressor, Llc Horizontal rotary compressor with enhanced tiltability during operation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2250947A1 (de) 1972-10-18 1974-05-02 Bitzer Kuehlmaschinenbau Kg Verdichter fuer kaeltemaschinen
KR20070121321A (ko) * 2006-06-22 2007-12-27 주식회사 한두아이펨 엔진개조형 냉매압축기 및 이를 구비하는 냉난방장치
DE102013203268A1 (de) * 2013-02-27 2014-08-28 Bitzer Kühlmaschinenbau Gmbh Kältemittelverdichteranlage
EP3657017A1 (fr) * 2018-11-22 2020-05-27 BITZER Kühlmaschinenbau GmbH Compresseur frigorifique

Also Published As

Publication number Publication date
BR102023009868A2 (pt) 2023-11-28
CN116498521A (zh) 2023-07-28
US20230384003A1 (en) 2023-11-30
DE102022113123A1 (de) 2023-11-30

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