US20150098853A1 - Screw-type positive displacement machine - Google Patents

Screw-type positive displacement machine Download PDF

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Publication number
US20150098853A1
US20150098853A1 US14/400,614 US201314400614A US2015098853A1 US 20150098853 A1 US20150098853 A1 US 20150098853A1 US 201314400614 A US201314400614 A US 201314400614A US 2015098853 A1 US2015098853 A1 US 2015098853A1
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US
United States
Prior art keywords
positive displacement
motor
displacement machine
rotor
synchronization wheel
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
US14/400,614
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English (en)
Inventor
Didier Müller
Théodore Iltchev
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.)
Ateliers Busch SA
Original Assignee
Ateliers Busch SA
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 Ateliers Busch SA filed Critical Ateliers Busch SA
Assigned to ATELIERS BUSCH SA reassignment ATELIERS BUSCH SA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ILTCHEV, Théodore, MÜLLER, Didier
Publication of US20150098853A1 publication Critical patent/US20150098853A1/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
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/102—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member the two members rotating simultaneously around their respective axes
    • 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
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0096—Heating; Cooling
    • 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
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/082—Details specially related to intermeshing engagement type machines or pumps
    • F04C2/084—Toothed wheels
    • 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
    • F04C2240/00—Components
    • F04C2240/40—Electric motor
    • F04C2240/402—Plurality of electronically synchronised motors
    • 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
    • F04C29/04—Heating; Cooling; Heat insulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2251/00—Material properties
    • F05C2251/14—Self lubricating materials; Solid lubricants

Definitions

  • This invention relates to an improved screw-type positive displacement machine. More specifically, this invention relates to a positive displacement machine comprising a housing with a first rotor and a second rotor which are mounted to rotate in the housing and are which are driven in directions that are opposite of one another.
  • rotary positive displacement machines In the field of vacuum technology, rotary positive displacement machines have been used for a number of years and serve as machines for pumping compressible gases.
  • the pumps referred to as “screw type” are used in particular. They typically comprise a housing and two twin rotors, mounted to rotate in this housing and driven in directions which are opposite of one another.
  • the rotors of this type of pump are constituted by parts of screw shape, i.e. parts comprising a core which bears one or more threads whose pitch can be constant or variable along the longitudinal dimension of the rotor.
  • the rotors in a conventional screw pump are normally driven by an asynchronous electric motor.
  • An asynchronous motor is typically composed of two main pieces, i.e. a stator in a ferromagnetic material which serves as support and which includes a winding connected to the network or to a variable speed drive, and a rotor in the form of a cylinder, likewise in a ferromagnetic material, which is fixed to the stator by bearings.
  • the rotor comprises a winding made up of short-circuited conductors. The conductors of the rotor are passed through by currents induced by the magnetic field which is created by the stator currents.
  • one of the two pump screws is directly connected to the rotor of the asynchronous motor in such a way that it is automatically driven by the motor.
  • a connection piece between the rotor of the motor and the shaft of the rotor but it is important to note that the rotation of the rotor of the motor is transmitted in a direct way to one of the rotors of the pump. Thanks to a gearing which connects the two screws of the pump, the rotation of the first screw which is directly driven by the motor is directly transmitted to the other screw.
  • An asynchronous motor is made up of a rotating part (or the rotor) and a fixed part (or the stator).
  • the rotor in a synchronous motor is set in rotation by a magnetic field which is provided either by permanent magnets or by coils which are fed in d.c. current.
  • the rotor in low power motors uses permanent magnets while electromagnets are used in motors with higher power.
  • each of the two rotors (or screws) of the pump is driven by one of the two motors.
  • the synchronization of the movements of the two rotors is achieved directly through the two motors.
  • the speed of rotation of the synchronous motors corresponds by default to the speed of rotation of the rotating field, it is easy to control the speed of rotation of the two screws using a corresponding control module. Thanks to this combined control module for the two motors, the speed of rotation of the two rotors of the pump can be synchronized.
  • the object of the present invention thus aims to overcome the aforementioned disadvantages and to provide a screw-type positive displacement machine which is at the same time less complex, less bulky and also less expensive than the machines of known type.
  • Another object of the present invention is to propose a screw-type positive displacement machine which is absolutely free of any lubricant which could pollute the pumped fluids.
  • a screw-type positive displacement machine comprising a housing with a first rotor and a second rotor which are mounted to rotate in the housing and which are driven in directions opposite of one another, the positive displacement machine comprising a first motor and a second motor which are arranged in a drive casing and which are connected to the housing in such a way that the first rotor is driven by the first motor and the second rotor is driven by the second motor.
  • the advantage of this invention resides in particular in the fact that the rotors of the positive displacement machine proposed are driven individually. Owing to such individual driving, the two rotors can be driven more precisely and in a way more adapted to the concrete needs of the particular use.
  • the first motor and/or the second motor is an asynchronous motor.
  • This embodiment of the invention has the advantage, among other things, that the use of asynchronous motors makes the production of the positive displacement machine much less expensive than in the case of use of synchronous motors such as proposed in the state of the art. Moreover an asynchronous motor can typically be maintained and controlled in a much easier way than a synchronous motor having a comparable level of performance.
  • the rotary part of the first motor is connected to the first rotor and/or the rotary part of the second motor is connected to the second rotor.
  • the advantage of this embodiment of the present invention can be found, among other things, in the simple construction of the positive displacement machine.
  • the rotors (the rotary parts) of the motors can be directly connected to the rotors of the machine, but it is also possible to insert one or more connection elements between the rotary parts of the motors and the rotors of the pump.
  • a first synchronization wheel and a second synchronization wheel which mesh with one another, are provided, connected to the first rotor and second rotor respectively. Thanks to these synchronization wheels, a synchronized movement of the two rotors of the positive displacement machine is possible even in the case of stopping of one of the two motors. In fact, as the two synchronization wheels are connected to two rotors and as they mesh at all times in movement, a non-synchronized rotation of the two rotors is not possible. Thus damage to the screws is also not possible.
  • the contact surface between the first synchronization wheel and the second synchronization wheel is not lubricated.
  • the advantage of this embodiment of the invention is, among other things, that it allows a positive displacement machine to be achieved absolutely free of any lubricant. Owing to this fact, such machines can also be used in sensitive applications where elevated standards of hygiene must be respected. Also these machines are simpler to maintain since they do not need draining or other procedures for the lubricant.
  • Another embodiment of the present invention foresees that the surface of the teeth of the first synchronization wheel and/or of the second synchronization wheel is covered by a layer of material having a low coefficient of friction.
  • This embodiment is advantageous, among other things, because it produces synchronization wheels which are able to support the transmission of elevated moments between them, owing to the fact that the friction at the surface of contact of the two wheels is diminished.
  • the suitable materials to be used as covering are different types of metals and/or alloys (for example alloys of iron, of copper, of tin, of lead, etc.) as well as ceramic or different synthetic substances (such as, for example, Teflon®, etc.).
  • the machine comprises a starter to synchronize the startup of the first motor and of the second motor.
  • the advantage of this embodiment of the present invention resides, among other things, in a coordinated operation of the motors. Thanks to such a coordinated startup, the parameters of operation of the two motors (for example the speed of rotation, but also other parameters) can be synchronized to the maximum.
  • FIG. 1 a partial view and a section of an example realization of a positive displacement machine according to one embodiment of the present invention
  • FIG. 2 a view in perspective of an end of the rotors of a positive displacement machine according to one embodiment of the present invention, one of the two rotors of which is shown in section;
  • FIG. 3 a view of part of the outer body of the positive displacement machine according to one embodiment of the present invention.
  • FIG. 1 is a schematic and sectional illustration of an example embodiment of a positive displacement machine according to the present invention.
  • the positive displacement machine according to the invention necessarily has other elements so that it is able to be operational.
  • the positive displacement machine 1 in FIG. 1 comprises essentially a housing 2 which encloses two rotors 3 ′ and 3 ′′.
  • the housing 2 of the machine 1 can be made as one sole piece or, as represented in FIG. 1 , can be made up of different pieces.
  • the housing 2 is open toward one side, and a cover 21 is used to close the housing 2 in order to create a closed chamber.
  • the rotors 3 ′, 3 ′′ each comprise a shaft 31 ′, 31 ′′ on which are installed two screws (not shown) with specific profiles. Generally the two screws of the rotors 3 ′, 3 ′′ are symmetrical with respect to the middle axis A of the machine 1 . In operation of the machine 1 , the rotors 3 ′, 3 ′′ are driven in rotation in directions opposite of one another. The principle of drive of the rotors 3 ′, 3 ′′ in the positive displacement machine 1 will be explained further below.
  • a drive casing 5 Integral with the housing 2 of the machine 1 is a drive casing 5 which comprises two motors 4 ′ and 4 ′′.
  • a drive casing 5 which comprises two motors 4 ′ and 4 ′′.
  • two different drive casings one for each of the motors 4 ′, 4 ′′, or a completely different solution.
  • the motors 4 ′, 4 ′′ are asynchronous electric motors. These two asynchronous motors 4 ′. 4 ′′ are composed of rotors 41 ′, 41 ′′ and stators 42 ′, 42 ′′. While the stators 42 ′, 42 ′′ are immobile (and typically integral) with respect to the drive casing 5 , the rotors 41 ′, 41 ′′ are set in rotation (and represent in this way rotary parts of the motors 4 ′, 4 ′′) owing to the magnetic fields created by the currents in the stators 42 ′, 42 ′′ which induce currents in the windings of the rotors 41 ′, 41 ′′. These well-known elements of asynchronous motors are not represented in FIG. 1 since one skilled in the art is absolutely able to grasp their placement and their way of operating in an actual motor.
  • the shafts 31 ′, 31 ′′ of the rotors 3 ′, 3 ′′ taper toward the motors 4 ′, 4 ′′ in the tapered zones 32 ′, 32 ′′.
  • These zones 32 ′, 32 ′′ of the rotors 3 ′, 3 ′′ are connected to rotors (to rotary parts) 41 ′, 41 ′′ of the motors 4 ′, 4 ′′ and can thus rotate directly with them.
  • the rotors 3 ′, 3 ′′ are typically supported in rotation by bearings 7 ′, 7 ′′ which are accommodated between the drive casing and enclosed chamber by the housing 2 .
  • bearings 7 ′, 7 ′′ which are accommodated between the drive casing and enclosed chamber by the housing 2 .
  • solutions are possible comprising another variant of positioning of bearings.
  • synchronization wheels 6 ′, 6 ′′ are provided, integral with the rotors 3 ′ and 3 ′′, respectively.
  • the teeth of the synchronization wheels 6 ′, 6 ′′ are not normally supposed to transmit moments between the two rotors 3 ′, 3 ′′.
  • small moments to be counterbalanced may nevertheless appear. This is particularly possible owing to the symmetry—albeit in opposite direction—of the left part (with the rotor 3 ′ and the motor 4 ′) and the right part (with the rotor 3 ′′ and the motor 4 ′′) of the machine 1 .
  • the rotors 41 ′, 41 ′′ thereof are set in rotation and drive the rotors 3 ′, 3 ′′ of the machine 1 .
  • the rotation of the rotor 3 ′ is absolutely independent of the rotation of the rotor 3 ′′ since the motors 4 ′, 4 ′′ are both perfectly independent asynchronous motors.
  • the motors 4 ′, 4 ′′ are both perfectly independent asynchronous motors.
  • motors 4 ′, 4 ′′ of the same type preferably from the same producer, having all the operation parameters identical (for example nominal speed, etc.) to make uniform as much as possible the parameters able to have an influence on the synchronization.
  • a starter (not shown) can moreover be provided in order to be able to carry out a simultaneous startup of the motors 4 ′, 4 ′′.
  • other solutions are likewise possible.
  • the synchronization wheels 6 ′, 6 ′′ serve instead to ensure a synchronization of the movements even in the case of a failure of one of the two motors.
  • the wheels 6 ′, 6 ′′ play the role of a “conventional” gearing and transmit the moments from one rotor to the other. Thanks to this structure, the machine 1 can continue to operate for the time it takes for a gradual stop and without risk for the whole installation.
  • the object of the invention is to make operational the pump equipped with an asynchronous motor for each rotor. These motors then rotate in a manner non-synchronized electronically with the gear train having a dry synchronization or a synchronization not lubricated with oil.
  • This object of the present invention is attained with the aid of a structure of the positive displacement machine such as described above.
  • teeth of the synchronization wheels 6 ′, 6 ′′ through calculation by optimizing certain parameters of which the most important are in particular the sliding speed and the mechanical efficiency of the transmission.
  • suitable materials can be used in order to increase the desired performance of the wheels 6 ′, 6 ′′, i.e. steels of different types (for example blister steel, nitrided steel, carbon-nitrided steel, tool steel, etc.) as well as different synthetic or plastic materials.
  • suitable thermal treatments can be applied to the materials of the wheels 6 ′, 6 ′′ to obtain increased hardness of the surface but also of the depth at the middle of the teeth.
  • suitable machining and finishing aiming at a good precision of the teeth but also microfinishing enabling the smoothest possible surface state to be obtained. It goes without saying that suitable machining and finishing can also be used to put the surfaces in necessary state to carry out the application of thin layers of coatings.
  • FIG. 2 shows an end of the rotors of the positive displacement machine, one of the two rotors being represented in section.
  • a toothing in plastic 63 which is fixed on a hub of steel 61 and held by a cover of metal 64 .
  • This structure is locked by the screws 62 .
  • these screws can in particular be in a number greater than really necessary for the mechanical fixation.
  • these screws 62 pass through the plastic toothing 63 and are in contact therewith in such a way as to serve as heat sinks collecting thermal units and conducting them to the exterior faces of the hub 61 and of the cover 64 .
  • the exterior face of the cover 64 and/or the face of the hub 61 can have grooves 641 which, through the rotation, serve to facilitate heat exchange with the air.
  • one or more openings 22 of suitable shape and positioning can be provided to allow the circulation of the air inside of the machine to thus improve removal of the heat.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Rotary Pumps (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Transmission Devices (AREA)
US14/400,614 2012-05-25 2013-05-27 Screw-type positive displacement machine Abandoned US20150098853A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EPPCT/EP2012/059876 2012-05-25
EP2012059876 2012-05-25
PCT/EP2013/060887 WO2013175019A2 (fr) 2012-05-25 2013-05-27 Machine volumétrique de type "à vis" améliorée

Publications (1)

Publication Number Publication Date
US20150098853A1 true US20150098853A1 (en) 2015-04-09

Family

ID=48539131

Family Applications (1)

Application Number Title Priority Date Filing Date
US14/400,614 Abandoned US20150098853A1 (en) 2012-05-25 2013-05-27 Screw-type positive displacement machine

Country Status (11)

Country Link
US (1) US20150098853A1 (fr)
JP (1) JP2015520824A (fr)
KR (1) KR20150011397A (fr)
CN (1) CN104350281A (fr)
AU (1) AU2013265173A1 (fr)
BR (1) BR112014028701A2 (fr)
CA (1) CA2872548A1 (fr)
HK (1) HK1204803A1 (fr)
IN (1) IN2014MN02227A (fr)
RU (1) RU2014152812A (fr)
WO (1) WO2013175019A2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106151031A (zh) * 2016-09-30 2016-11-23 北京艾岗科技有限公司 一种无油螺杆空压机
CN113039346A (zh) * 2018-11-30 2021-06-25 尼得科盖普美有限责任公司 用于冷却电池组的螺杆泵
CN113544358A (zh) * 2018-12-18 2021-10-22 阿特拉斯·科普柯空气动力股份有限公司 用于排出介质的诸如压缩机、膨胀机、泵等的容积式机器以及由其使用的方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US851449A (en) * 1906-06-25 1907-04-23 Samuel W Smith Machine-gear.
US3013440A (en) * 1959-12-14 1961-12-19 John T White Composite plastic metal gear and method of making same
US5904473A (en) * 1995-06-21 1999-05-18 Sihi Industry Consult Gmbh Vacuum pump
US20080085207A1 (en) * 2006-10-10 2008-04-10 Dieter Mosemann Oil-flooded screw compressor with axial-thrust balancing device

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US3541871A (en) * 1969-03-14 1970-11-24 Alfred A Burrell Universal-type hub
DK1070848T3 (da) * 1999-07-19 2004-08-09 Sterling Fluid Sys Gmbh Fortrængningsmaskine til kompressible medier
CN2823686Y (zh) * 2005-09-16 2006-10-04 郑广华 组合齿轮
CN101614274B (zh) * 2009-07-30 2011-09-14 杭州星河传动机械研究院有限公司 分体式齿轮
CN201747891U (zh) * 2010-06-13 2011-02-16 大同齿轮(昆山)有限公司 一种组装齿轮

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US851449A (en) * 1906-06-25 1907-04-23 Samuel W Smith Machine-gear.
US3013440A (en) * 1959-12-14 1961-12-19 John T White Composite plastic metal gear and method of making same
US5904473A (en) * 1995-06-21 1999-05-18 Sihi Industry Consult Gmbh Vacuum pump
US20080085207A1 (en) * 2006-10-10 2008-04-10 Dieter Mosemann Oil-flooded screw compressor with axial-thrust balancing device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106151031A (zh) * 2016-09-30 2016-11-23 北京艾岗科技有限公司 一种无油螺杆空压机
CN113039346A (zh) * 2018-11-30 2021-06-25 尼得科盖普美有限责任公司 用于冷却电池组的螺杆泵
CN113544358A (zh) * 2018-12-18 2021-10-22 阿特拉斯·科普柯空气动力股份有限公司 用于排出介质的诸如压缩机、膨胀机、泵等的容积式机器以及由其使用的方法

Also Published As

Publication number Publication date
WO2013175019A3 (fr) 2014-06-12
RU2014152812A (ru) 2016-07-20
CA2872548A1 (fr) 2013-11-28
HK1204803A1 (en) 2015-12-04
JP2015520824A (ja) 2015-07-23
IN2014MN02227A (fr) 2015-07-17
AU2013265173A1 (en) 2014-11-27
CN104350281A (zh) 2015-02-11
KR20150011397A (ko) 2015-01-30
WO2013175019A2 (fr) 2013-11-28
BR112014028701A2 (pt) 2017-06-27

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