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US20050013702A1 - Screw compressor - Google Patents

Screw compressor Download PDF

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Publication number
US20050013702A1
US20050013702A1 US10/884,421 US88442104A US2005013702A1 US 20050013702 A1 US20050013702 A1 US 20050013702A1 US 88442104 A US88442104 A US 88442104A US 2005013702 A1 US2005013702 A1 US 2005013702A1
Authority
US
United States
Prior art keywords
screw compressor
accordance
control slide
path
screw
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.)
Abandoned
Application number
US10/884,421
Other languages
English (en)
Inventor
Rolf Dieterich
Klaus Feller
Pascal Papadopoulos
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
Assigned to BITZER KUEHLMASCHINENBAU GMBH reassignment BITZER KUEHLMASCHINENBAU GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DIETERICH, ROLF, FELLER, KLAUS, PAPADOPOULOS, PASCAL
Publication of US20050013702A1 publication Critical patent/US20050013702A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • F04C28/10—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by changing the positions of the inlet or outlet openings with respect to the working chamber
    • F04C28/12—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by changing the positions of the inlet or outlet openings with respect to the working chamber using sliding valves
    • F04C28/125—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by changing the positions of the inlet or outlet openings with respect to the working chamber using sliding valves with sliding valves controlled by the use of fluid other than the working fluid
    • 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
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
    • 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

Definitions

  • the invention relates to a screw compressor for gaseous media, in particular refrigerants, comprising a compressor housing, two screw rotors arranged in screw rotor bores in the compressor housing, which are rotatingly drivable and interact to compress the medium, and a control slide arranged adjacent the screw rotors and movable in a direction of displacement for controlling the compression of the screw compressor.
  • An element scannable in this way makes it possible to exactly detect the position of the control slide in the direction of displacement and hence to also exactly know and, if desired, regulate the set compression of the screw compressor.
  • the scannable element could have an optically or magnetically scannable inner structure.
  • the scannable element it has proven particularly expedient for the scannable element to have a scannable outer contour.
  • Such a scannable outer contour could, for example, be a tooth-like outer contour which is optically, inductively or mechanically scannable.
  • the scannable outer contour is a path with a scan area.
  • Such a path with a scan area could also be scanned in a non-contacting manner.
  • Such a scan area is particularly easy to scan when it extends at an incline to the direction of displacement of the control slide.
  • the scannability of the scan area is facilitated by the scan area extending substantially in a straight line, but at an incline to the direction of displacement of the control slide.
  • the path follower could be arranged on an arm and guided in a connecting member for movement on a curved path.
  • the path of the path follower can be detected in a particularly simple way when the path follower is movable in a straight line.
  • the path which has to be detected by the path follower it has proven expedient for the path to be designed such that the maximum distance to be traveled by the path follower in the transverse direction is less than the maximum distance to be traveled by the path in the direction of displacement.
  • This solution has the particular advantage that conventional short-stroke position sensors can then be employed to detect the maximum distance traveled by the path follower, which makes a compact structural design of the screw compressor possible.
  • a particularly expedient solution makes provision for the scannable element to be arranged within the housing in the area of a bearing receptacle of the screw rotor.
  • the scannable element can thus be accommodated in a particularly space-saving way.
  • the scannable element could, in principle, be arranged directly on the control slide itself, on a connection between the control slide and an adjusting device for the control slide or on the adjusting device for the control slide itself.
  • a solution which is particularly simple from a constructional point of view makes provision for the scannable element to be arranged on a carrier mounted on the control slide.
  • the scannable element In order to make use of the space available in present screw compressors for the arrangement of the scannable element, provision is expediently made for the scannable element to extend in the direction of displacement of the control slide away from the control slide, in particular, in the direction opposite to an adjusting direction of the control slide.
  • the carrier prefferably be arranged at an end of a guide element of the control slide and to extend, for example, in the direction of a drive motor for the screw rotors.
  • a particularly expedient solution makes provision for the carrier to be arranged within a cross-sectional area of the control slide. This solution has the great advantage that the carrier can be pre-assembled on the control slide and hence inserted into the slide bore together with the slide, without insertion of the control slide into the slide bore being impeded by the carrier.
  • the carrier when the carrier is arranged on the guide element of the control slide, it is expedient for the carrier to be arranged within a cross-sectional area of the guide element of the control slide, so that, in this case, too, pre-assembly of the carrier on the guide element is possible, and this pre-assembled carrier does not obstruct insertion of the guide element into the part of the slide bore provided for the carrier.
  • the measuring sensor is a position sensor, so that positions directly following one another can be detected with it.
  • the measuring sensor prefferably be designed so as to detect a displacement path of the path follower generated by the path transversely to the direction of displacement.
  • a control device is preferably provided for determining a position of the control slide by means of the measuring sensor and regulating the position of the control slide via actuation of an adjusting device for the control slide.
  • FIG. 1 a longitudinal section through an embodiment of a screw compressor according to the invention.
  • FIG. 2 an enlarged detail from FIG. 1 in the area of a compressor screw housing with control slide.
  • FIG. 1 An embodiment of a screw compressor according to the invention, as illustrated in FIG. 1 , comprises a housing generally designated 10 , which includes a section 12 on the motor side, a compressor section 14 and a section 16 on the pressure side.
  • An electric motor generally designated 20 is provided in the section 12 on the motor side. Its stator 22 is firmly seated in the section 12 of the housing 10 on the motor side and its rotor 24 is mounted for rotation about an axis 26 within the stator 22 .
  • the rotor 24 drives a drive shaft 28 via which a pair of interacting screw rotors 30 is rotatingly drivable.
  • the pair of screw rotors 30 is seated in screw rotor bores 32 of a compressor screw housing generally designated 34 , which is arranged in the compressor section 14 of the housing 10 .
  • bearing receptacles 36 and 38 are provided in the outer housing 10 .
  • Shaft sections 40 and 42 extending from the screw rotors 30 are rotatably mounted by means of rotary bearings 44 and 46 in the bearing receptacles 36 and 38 .
  • the bearing receptacles 36 and 38 and the compressor screw housing 34 are preferably integrally formed on the housing 10 in the area of the compressor section 14 .
  • a control slide 50 is movable in a direction of displacement 52 extending parallel to the axis 26 .
  • the control slide 50 is coupled via a coupling rod 54 with an adjusting device 56 comprising, for example, an adjusting cylinder 58 and an adjusting piston 60 which is displaceable by pressurized media within the adjusting cylinder 58 , so that the control slide 50 coupled via the coupling rod 54 is likewise displaceable in accordance with the positions of the adjusting piston 60 .
  • the control slide 50 has a control edge 64 facing an inlet side 62 of the compressor screw housing 34 .
  • the compression ratio can be reduced in a controlled manner by displacement of the control edge 64 in the direction of an outlet 66 of the compressor screw housing 34 .
  • the compression ratio is at a maximum when the control edge 64 is displaced to a maximum extent in the direction of the inlet 62 , whereas the compression ratio is at a minimum when the control edge 64 is displaced to a maximum extent in the direction of the outlet 66 .
  • the adjusting device 56 is actuated via a control device generally designated 70 of the screw compressor, and exact regulation requires a position of the control slide 50 to be determinable.
  • path carrier 72 which, coupled with the control slide 50 , is displaceable in the direction of the direction of displacement 52 and comprises a path 74 which can be scanned by a path follower 76 .
  • the path 74 is preferably provided on the path carrier 72 in the form of a straight-lined scan area 78 which extends at an incline to the direction of displacement 52 preferably in such a manner that upon maximum displacement of the control slide 50 from the position corresponding to a maximum compression ratio to a position corresponding to a minimum compression ratio, it displaces the path follower 76 in its direction of movement 80 extending transversely, preferably approximately perpendicularly, to the direction of displacement 52 , through a maximum path which is smaller than the maximum path of the control slide 50 with the path carrier 72 in the direction of displacement 52 .
  • the path follower 76 is preferably formed by the head of a feeler pin 82 of a position sensor 84 which senses the path of the path follower 76 in the direction of movement 80 and transmits it to the control device 70 .
  • a definite position of the control slide 50 in the direction of displacement 52 is allocated to each individual position of the path follower 76 in the direction of movement 80 , so that the respective position of the control slide 50 can be precisely detected with the position sensor 84 .
  • the path carrier 72 is preferably held on a guide element 86 of the control slide 50 , which extends beyond the control edge 64 in the direction of displacement 52 . More specifically, the path carrier 72 is held as a continuation of the guide element 86 , but within a maximum cross section of the control slide 50 , so that the path carrier 72 , viewed in the direction of the axis 26 , extends approximately in the area of the bearing receptacle 36 lying between the electric motor 20 and the compressor screw housing 34 , more specifically, in an inner space 88 of the outer housing 10 surrounding the bearing receptacle 36 .
  • the inner space 88 extends around the bearing receptacle 36 as far as the inlet side 62 of the compressor screw housing 34 and also in the direction of the electric motor 20 . Owing to the arrangement of the path carrier 72 within the maximum cross-sectional shape of the control slide 50 and, in particular, within a cross-sectional shape of the guide element 86 , the control slide 50 with the path carrier 72 mounted thereon is insertable from the side of the outlet 66 into the slide bore 48 and slidable through this as far as the inner space 88 .
  • the inner space 88 is preferably at the pressure of the inflow of refrigerant in the area of the inlet side 62 .
  • the position sensor 84 is preferably seated on an outer side of the compressor section 14 of the housing 10 and with the feeler pin 82 passes through a bore 90 extending through the housing 10 , so as to rest with the path follower 76 in a spring-biased manner on the path 74 .
  • control slide 50 By exactly determining the position of the control slide 50 it is thus possible to precisely regulate the position of the control slide 50 by means of the control device 70 , more specifically, by actuating the pressurization of the adjusting piston 60 in the adjusting cylinder 58 and monitoring the position reached by the control slide 50 via the position sensor 84 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
US10/884,421 2003-07-16 2004-07-02 Screw compressor Abandoned US20050013702A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10333400A DE10333400A1 (de) 2003-07-16 2003-07-16 Schraubenverdichter
DE10333400.9 2003-07-16

Publications (1)

Publication Number Publication Date
US20050013702A1 true US20050013702A1 (en) 2005-01-20

Family

ID=33462008

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/884,421 Abandoned US20050013702A1 (en) 2003-07-16 2004-07-02 Screw compressor

Country Status (4)

Country Link
US (1) US20050013702A1 (de)
EP (1) EP1498611A1 (de)
CN (1) CN1576588A (de)
DE (1) DE10333400A1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160319814A1 (en) * 2013-12-12 2016-11-03 Gea Refrigeration Germany Gmbh Compressor
US20160327043A1 (en) * 2015-05-09 2016-11-10 Man Diesel & Turbo Se Screw Machine
US10648473B2 (en) 2014-07-19 2020-05-12 Gea Refrigeration Germany Gmbh Screw compressor
US10794382B2 (en) 2014-10-08 2020-10-06 Bitzer Kuehlmaschinebau GmbH Screw compressor with control slider and detector
US11460026B2 (en) 2016-04-06 2022-10-04 Bitzer Kuehlmaschinenbau Gmbh Compressor unit and method for operating a compressor unit

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10941770B2 (en) 2010-07-20 2021-03-09 Trane International Inc. Variable capacity screw compressor and method
CN102748286A (zh) * 2012-04-11 2012-10-24 无锡市制冷设备厂有限责任公司 一种螺杆压缩机

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4351160A (en) * 1980-06-16 1982-09-28 Borg-Warner Corporation Capacity control systems for screw compressor based water chillers
US4536130A (en) * 1984-06-18 1985-08-20 Dunham-Bush, Inc. Simplified unloader indicator for helical screw rotary compressor
US4548549A (en) * 1982-09-10 1985-10-22 Frick Company Micro-processor control of compression ratio at full load in a helical screw rotary compressor responsive to compressor drive motor current
US4609329A (en) * 1985-04-05 1986-09-02 Frick Company Micro-processor control of a movable slide stop and a movable slide valve in a helical screw rotary compressor with an enconomizer inlet port
US4610612A (en) * 1985-06-03 1986-09-09 Vilter Manufacturing Corporation Rotary screw gas compressor having dual slide valves
US5257921A (en) * 1992-05-19 1993-11-02 Fes, Inc. Electronic slide valve position indicator

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09158867A (ja) * 1995-12-06 1997-06-17 Hitachi Ltd スクリュー圧縮機の容量検知装置
GB2331574A (en) * 1997-11-20 1999-05-26 Gethin Bermingham Sensing device for screw compressor valve

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4351160A (en) * 1980-06-16 1982-09-28 Borg-Warner Corporation Capacity control systems for screw compressor based water chillers
US4548549A (en) * 1982-09-10 1985-10-22 Frick Company Micro-processor control of compression ratio at full load in a helical screw rotary compressor responsive to compressor drive motor current
US4536130A (en) * 1984-06-18 1985-08-20 Dunham-Bush, Inc. Simplified unloader indicator for helical screw rotary compressor
US4609329A (en) * 1985-04-05 1986-09-02 Frick Company Micro-processor control of a movable slide stop and a movable slide valve in a helical screw rotary compressor with an enconomizer inlet port
US4610612A (en) * 1985-06-03 1986-09-09 Vilter Manufacturing Corporation Rotary screw gas compressor having dual slide valves
US5257921A (en) * 1992-05-19 1993-11-02 Fes, Inc. Electronic slide valve position indicator

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160319814A1 (en) * 2013-12-12 2016-11-03 Gea Refrigeration Germany Gmbh Compressor
EP3080457B1 (de) * 2013-12-12 2021-07-14 GEA Refrigeration Germany GmbH Verdichter
US10648473B2 (en) 2014-07-19 2020-05-12 Gea Refrigeration Germany Gmbh Screw compressor
US10794382B2 (en) 2014-10-08 2020-10-06 Bitzer Kuehlmaschinebau GmbH Screw compressor with control slider and detector
US20160327043A1 (en) * 2015-05-09 2016-11-10 Man Diesel & Turbo Se Screw Machine
US10393118B2 (en) * 2015-05-09 2019-08-27 Man Energy Solutions Se Screw machine
US11460026B2 (en) 2016-04-06 2022-10-04 Bitzer Kuehlmaschinenbau Gmbh Compressor unit and method for operating a compressor unit

Also Published As

Publication number Publication date
EP1498611A1 (de) 2005-01-19
DE10333400A1 (de) 2005-02-10
CN1576588A (zh) 2005-02-09

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Legal Events

Date Code Title Description
AS Assignment

Owner name: BITZER KUEHLMASCHINENBAU GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:DIETERICH, ROLF;FELLER, KLAUS;PAPADOPOULOS, PASCAL;REEL/FRAME:015559/0627

Effective date: 20040604

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION