US20110110802A1 - Compressor assembly - Google Patents

Compressor assembly Download PDF

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Publication number
US20110110802A1
US20110110802A1 US12/927,171 US92717110A US2011110802A1 US 20110110802 A1 US20110110802 A1 US 20110110802A1 US 92717110 A US92717110 A US 92717110A US 2011110802 A1 US2011110802 A1 US 2011110802A1
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US
United States
Prior art keywords
compressor
fluid
compressor assembly
rotary drive
gear
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
US12/927,171
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English (en)
Inventor
Lothar Peter Schmitz
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Individual
Original Assignee
Individual
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Filing date
Publication date
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Publication of US20110110802A1 publication Critical patent/US20110110802A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C17/00—Arrangements for drive of co-operating members, e.g. for rotary piston and casing
    • F01C17/02—Arrangements for drive of co-operating members, e.g. for rotary piston and casing of toothed-gearing 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
    • 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
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/08—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by varying the rotational speed
    • 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
    • F04C29/0042—Driving elements, brakes, couplings, transmissions specially adapted for 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
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/0042—Driving elements, brakes, couplings, transmissions specially adapted for pumps
    • F04C29/0085—Prime movers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/02—Lubrication; Lubricant separation
    • F04C29/025—Lubrication; Lubricant separation using a lubricant pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H3/00—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
    • F16H3/44—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion using gears having orbital motion

Definitions

  • the present invention relates to compressors, and more particularly to a compressor assembly.
  • Tankers carrying dry bulk materials, such as cement, flour, plastic pellets, etc. are unloaded by pressurizing the tank with air, typically up to 3 bar absolute pressure.
  • air typically up to 3 bar absolute pressure.
  • the preferred mounting of the compressor is normally within the chassis of a towing tractor unit.
  • the drive for the compressor is provided by means of a power take off attached to the aperture of the engine gear box of the tractor unit and connected to the compressor via a prop-shaft.
  • screw-type compressors are used.
  • the screws of a screw compressor must run at relatively high speeds, of the order of 7000 to 9000 rpm.
  • the maximum speed of the vehicle power take-off shafts is typically between 1600 and 1800 rpm. Consequently, the speed of the power take-up shaft must be increased by a factor of approximately in 4.5 in order to produce the required speed for the compressor.
  • the present invention relates to compressors, and more particularly to a compressor assembly.
  • the invention features a compressor assembly including compressor means having an inlet, an outlet and a means for drawing air through the inlet and exhausting compressed air through the outlet, rotary drive input means, and gear means for changing the speed of the rotary drive input means and having an input connected to the rotary drive input means and an output driving the compressor means, the gear means comprising planetary gear means.
  • the invention features a system having a flow path for fluid, the system including pump means for pressurizing fluid for flowing along the flow path, cooling means through which the flow path passes for dispersing heat from the flowing fluid, a fluid-operated motor actuated by the pressurized fluid, and a fan driven by the fluid-operated motor for generating an air current passing over the cooling means.
  • FIGS. 1( a ) and 1 ( b ) are a side view and end view respectively of an exemplary screw compressor in accordance with the present invention
  • FIG. 2 is a longitudinal cross-section through the exemplary screw compressor of FIG. 1 ;
  • FIG. 3 is a cross-section through the exemplary screw compressor of FIG. 1 , looking in the direction of arrows X-X of FIG. 2 ;
  • FIG. 4 is a schematic representation showing an exemplary operation of the exemplary screw compressor of FIG. 1 ;
  • FIG. 5 is a schematic representation showing a first variant of the exemplary screw compressor of FIG. 1 ;
  • FIG. 6 is a schematic representation showing a second variant of the exemplary screw compressor of FIG. 1 .
  • a screw compressor includes an elongate metal housing 10 having a base wall 12 , two generally parallel side walls 14 , 16 extending perpendicularly from the base wall, two inclined shoulder portions 18 , 20 at the upper end of each of the side walls and a top wall 22 extending parallel to the base wall 12 .
  • Two parallel end walls 24 , 26 extending perpendicularly to the base, side and top walls 10 , 14 , 16 , 22 are located one at each end of the housing.
  • the housing 10 encloses a conventional twin helical screw compressor 28 , having two helical screws, one female 28 a and the other male 28 b shown schematically in the drawings, which has an inlet 30 and outlet 32 in the housing 10 .
  • the screw compressor is driven by means of a step-up gear box 34 , which is typically driven by a power take-off via prop shaft (not shown) of a lorry of other vehicle.
  • the gear box 34 has two input shafts 36 , 38 , extending through one of the end walls 24 and offset both vertically and horizontally with respect to each other.
  • Each input shaft 36 , 38 is mounted in bearings 42 in the housing (only the bearings for the upper shaft 36 are visible in FIG. 2 ) and each input shaft 36 , 38 carries one of two identical spur gears 44 , 46 which meshes with the spur gear carried by the other input shaft, which ensures that both input shafts 36 , 38 rotate, irrespective of which one is driven.
  • the upper input shaft 36 and lower input shaft 38 rotate in opposite directions. This allows the compressor assembly to be used without modification, irrespective of the direction of rotation of the power take-off shaft.
  • the shaft of the correct rotational sense is connected to the power take-off shaft and the other unused shaft is covered by a removable cap 40 .
  • the upper input shaft 32 is connected to the carrier 50 of a planetary gear set.
  • Three equally-spaced identical planet gears 52 are rotatably mounted on the carrier 50 by means of bearings 54 and engage with an annulus 56 which is fixed with respect to the housing 10 .
  • the planet gears 52 also mesh with a sun gear 58 which is connected to an output shaft 60 of the planetary gear set P which forms the input to the female helical screw 28 a of the helical screw compressor 28 .
  • the output shaft 60 is mounted in bearings 62 in the housing 10 and carries a spur gear 64 which meshes with a spur gear 66 of an input shaft 68 of the male helical screw 28 b of the screw compressor 28 .
  • the male input shaft 68 is mounted in bearings 70 in the housing and is aligned parallel to the input shaft 60 of the female helical screw 28 b .
  • the opposite ends of the helical screw conveyors 28 a , 28 b are also mounted in bearings 72 , 74 in the end wall 26 remote from the input shafts 36 , 38 .
  • the spur gear 64 of the input shaft 60 of the female helical conveyor 28 a is larger than the spur gear 66 of the input shaft 68 of the male helical conveyor 28 b , whereby the male helical conveyor 28 a runs faster than the upper helical conveyor.
  • the step-up ratio in the embodiment described is 5:3, but a different step-up ratio, a step-down ratio or a 1:1 ratio may be used instead, depending on the circumstances and in particular depending on the model of helical screw compressor.
  • the screw compressor In use, the screw compressor is located in the appropriate position, typically on the tractor unit of an articulated lorry, and inlet and output pipes (not shown) are connected to the inlet and outlet 30 , 32 respectively.
  • a prop-shaft (not shown) connects the power take-off to one of the two input shafts 36 , 38 of the required direction of drive (clockwise or anticlockwise).
  • the protective shaft extension cover is secured over the other, “unused shaft”.
  • the power take-off is engaged. If the power take-off shaft is connected to the upper input shaft 36 , the carrier 50 , to which the input shaft is connected, is rotated at the same speed as the input shaft.
  • the interaction of the carrier 50 , planet gears 52 , fixed ring gear 56 and sun gear 58 produce a step-up ratio, typically of the order of 4.5:1 (although this could be much larger or much smaller) and cause the output shaft 60 of the planetary gear set P to rotate much more quickly than the input shaft 36 .
  • the female helical rotor 28 a rotates at the same speed as the shaft 60 and, by virtue of the inter-engaging spur gears 64 , 66 on the input shafts 60 , 68 of the female and male rotors 28 a , 28 b , the male rotor is also rotated.
  • the carrier 50 is still rotated at the same speed, by virtue of the meshing of the spur gears 44 , 46 on the upper and lower input shafts 36 , 38 .
  • Operation of the screw compressor is therefore independent of which input shaft 36 , 38 is connected to the prop-shaft.
  • the rotation of the rotors 28 a , 28 b is fixed by design and the power take-off rotation can be clockwise or anticlockwise. It is therefore important that the input shafts 36 , 38 facilitate rotation in both directions.
  • a planetary step-up gear set allows the overall size of the compressor assembly to be compact, which is particularly important if space for installation is limited, for example on the tractor unit of a lorry.
  • FIG. 4 A first variant of the embodiment of FIGS. 1 to 3 is shown in FIG. 4 .
  • the screw compressor is identical to that of FIGS. 1 to 3 and therefore has only been illustrated schematically.
  • the differences from the first embodiment relate to the lubrication system.
  • the lubrication system includes an oil pump 80 driven by the lower input shaft 38 .
  • the pump 80 draws oil via a filter 81 from a sump 82 in the base of the housing 10 and pumps it out of the housing via a connecting hose 84 to a hydraulic motor 86 .
  • a pressure relief valve 88 is also located between the pump 80 and the hydraulic motor 86 in order to protect the pump for excessively high pressures which can occur, for example, if the oil is viscous as a result of low ambient temperature at start-up of the compressor.
  • the hydraulic motor 86 drives a fan 90 for an oil cooler 92 located downstream of the hydraulic motor (although it could be mounted upstream of the hydraulic motor instead).
  • the cooled oil is then returned to the compressor housing 10 via a hose 94 , and is used to lubricate various components of the screw compressor in the normal way, via a number of flow restrictors R.
  • the cooling is not dependent on an external source of power, e.g. electricity, to drive the fan.
  • hydraulic systems generally have a high reliability, which minimizes the likelihood of breakdowns with the cooling system.
  • FIG. 6 A further variant is shown in FIG. 6 .
  • This variant includes all of the features of FIG. 5 and corresponding components have been given the same reference numerals.
  • the arrangement of FIG. 6 includes a further hydraulic motor 96 , between the first hydraulic motor 86 and the oil cooler 92 , which drives a second fan 98 for an air cooler 100 for cooling compressed air emerging from the air outlet 32 of the compressor.
  • the invention is not restricted to the details of the foregoing embodiments.
  • the embodiments refer to a screw compressor, other types of compressor could be used instead, for example a hook and claw compressor.
  • the embodiments are particularly useful when used on a lorry, the invention is not restricted to such use and the compressor could be used in other locations, such as in general industrial use.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US12/927,171 2009-11-10 2010-11-09 Compressor assembly Abandoned US20110110802A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0919643A GB2475245A (en) 2009-11-10 2009-11-10 Compressor assembly with planetary gear means
GB0919643.7 2009-11-10

Publications (1)

Publication Number Publication Date
US20110110802A1 true US20110110802A1 (en) 2011-05-12

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US12/927,171 Abandoned US20110110802A1 (en) 2009-11-10 2010-11-09 Compressor assembly

Country Status (4)

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US (1) US20110110802A1 (de)
EP (1) EP2357319A2 (de)
CA (1) CA2720156A1 (de)
GB (1) GB2475245A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130011274A1 (en) * 2010-02-12 2013-01-10 Nordic Water Products Ab Compressed air supply for the operation of moving bed filters
US20140271136A1 (en) * 2013-03-14 2014-09-18 Eaton Corporation Supercharger
WO2015198647A1 (ja) * 2014-06-25 2015-12-30 株式会社日立産機システム 気体圧縮機
CN110848133A (zh) * 2019-11-27 2020-02-28 海门市晶盛真空设备有限公司 一种干式螺杆真空泵的螺杆组件
US20220373076A1 (en) * 2019-12-06 2022-11-24 Jatco Ltd Transmission and control method for lubricating oil pressure control valve

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2578015A (en) * 1945-07-10 1951-12-11 Gustav A Reinhard Transmission
GB937469A (en) * 1960-07-06 1963-09-18 Fairchild Stratos Corp Change-ratio gearing
US20090016922A1 (en) * 2006-08-01 2009-01-15 Dieter Mosemann Screw compressor

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1599878A (en) * 1977-07-05 1981-10-07 Pidgeon H H J Oil-injected rotary compressors
JPS6368778A (ja) * 1986-09-08 1988-03-28 Daikin Ind Ltd 圧縮機における駆動伝達装置
JP2966012B2 (ja) * 1989-11-29 1999-10-25 栃木富士産業株式会社 コンプレッサ装置
US20080096711A1 (en) * 2006-10-23 2008-04-24 Gm Global Technology Operations, Inc. Variable speed accessory drive system
CN101323238B (zh) * 2008-06-20 2010-10-06 浙江大学 汽车空调混合驱动装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2578015A (en) * 1945-07-10 1951-12-11 Gustav A Reinhard Transmission
GB937469A (en) * 1960-07-06 1963-09-18 Fairchild Stratos Corp Change-ratio gearing
US20090016922A1 (en) * 2006-08-01 2009-01-15 Dieter Mosemann Screw compressor

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130011274A1 (en) * 2010-02-12 2013-01-10 Nordic Water Products Ab Compressed air supply for the operation of moving bed filters
US20140271136A1 (en) * 2013-03-14 2014-09-18 Eaton Corporation Supercharger
US9759218B2 (en) * 2013-03-14 2017-09-12 Eaton Corporation Supercharger with sun gear and planetary gears
WO2015198647A1 (ja) * 2014-06-25 2015-12-30 株式会社日立産機システム 気体圧縮機
CN110848133A (zh) * 2019-11-27 2020-02-28 海门市晶盛真空设备有限公司 一种干式螺杆真空泵的螺杆组件
US20220373076A1 (en) * 2019-12-06 2022-11-24 Jatco Ltd Transmission and control method for lubricating oil pressure control valve

Also Published As

Publication number Publication date
GB0919643D0 (en) 2009-12-23
GB2475245A8 (en) 2011-06-08
GB2475245A (en) 2011-05-18
CA2720156A1 (en) 2011-05-10
EP2357319A2 (de) 2011-08-17

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