CN100447388C - Jet motor or turbine motor - Google Patents

Jet motor or turbine motor Download PDF

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Publication number
CN100447388C
CN100447388C CNB038212609A CN03821260A CN100447388C CN 100447388 C CN100447388 C CN 100447388C CN B038212609 A CNB038212609 A CN B038212609A CN 03821260 A CN03821260 A CN 03821260A CN 100447388 C CN100447388 C CN 100447388C
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CN
China
Prior art keywords
jet
synchronous machine
compressor
rotor
turbogenerator
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.)
Expired - Lifetime
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CNB038212609A
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Chinese (zh)
Other versions
CN1682023A (en
Inventor
兹德涅克·卡托利赛克伊
切斯特米尔·哈夫拉内克
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PRVNI BRNENSKA STROJIRNA VELKA
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PRVNI BRNENSKA STROJIRNA VELKA
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Publication of CN1682023A publication Critical patent/CN1682023A/en
Application granted granted Critical
Publication of CN100447388C publication Critical patent/CN100447388C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K7/00Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/18Structural association of electric generators with mechanical driving motors, e.g. with turbines
    • H02K7/1807Rotary generators
    • H02K7/1823Rotary generators structurally associated with turbines or similar engines
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02CGAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C7/00Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
    • F02C7/26Starting; Ignition
    • F02C7/268Starting drives for the rotor, acting directly on the rotor of the gas turbine to be started

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

A jet or turbine motor that includes a radial or diagonal compressor containing at least one rotating part pivoted in the fixed part of the jet or turbine motor when a synchronous electromotor containing a mutually cooperating stator and rotor is coupled with at least one rotating part of the compressor where the rotor (200) of the synchronous electromotor (2) is fixed on the rotating part of the jet or turbine motor coupled with the compressor while the stator (201) of the synchronous electromotor (2) is, in alignment with the rotor (200) of the synchronous electromotor (2), placed on a fixed part of the jet or turbine motor and coupled with an electric power supply and/or consumer.

Description

Air breathing engine or turbogenerator
Technical field
The present invention relates to a kind of jet or turbogenerator that has radially (radial) or diagonal angle (diagonal) compressor, described compressor comprises at least one rotating part, be contained in jet or the turbogenerator standing part on, it can be rotated; Synchronous machine with the stator of mutual collaborative work and rotor is connected at least one rotating part of compressor.
Background technique
For having radially or the jet or turbogenerator of diagonal compressors, after the jet or turbogenerator, the initial start (rotation) that needs to guarantee rotor reaches required speed in starting.Making initial start jet or the turbogenerator rotor reach required speed, a lot of technological schemes are arranged is known.
Utilize pressurized air to have multiple by the known schemes of nozzle Driven Compressor blade.Also have some schemes to utilize the effect of pyrope tube on the turbine bucket (pyrope cartridge), its common shaft that rotatablely moves by compressor is delivered to compressor wheels.It also is known using the independent commutator machine that comprises electronic starter, for example, can mechanically connect jet or the turbogenerator axle by gear-box, starting clutch or flywheel clutch.If use said apparatus to be permanently connected to motor jet or the turbogenerator axle, it also can be used to supply electric power (allowing this purposes as fruit structure).Also there are some structures to contain independent motor or independent generator.
There are some shortcomings in above-mentioned structure: the big and big space of needs of weight.Other shortcoming is that the structure of known schemes is quite complicated, the required relevant height of creating conditions, corresponding apparatus cost height.
A kind of jet or turbogenerator with generator is disclosed from US3071691.The stator of generator is fixedly mounted on the dunnage, and dunnage also has rotor shaft.Dunnage is installed to shell end by connecting rod or bolt.Compressor drum is fixed together by lock bolt.Turbine rotor comprises barrel portion, and barrel portion passes suction passage and stops in generator the place ahead.The pipe that carries of generator amature is screwed on the barrel portion.Carry rotor portion that pipe makes turbine by this way and extend to the supporting portion of generator space and stationary power generation machine rotor.This structure still needs very big space, because the various piece of generator is far away with respect to compressor.
The objective of the invention is to eliminate or at utmost reduce the shortcoming of prior art.
Summary of the invention
The objective of the invention is to utilize a kind of jet or turbogenerator reaches, its principle is as follows: the rotor of synchronous machine is fixed on the rotating part of the jet or turbogenerator that is connected with compressor, and the stator of the synchronous machine that aligns with the rotor of synchronous machine places on the standing part of jet or turbogenerator and is connected power supply and/or power device.By this configuration, can reduce the space requirement of " synchronous machine-jet or turbogenerator " system, for the rotating part of synchronous machine is installed, also utilize current jet or turbogenerator rotating part to install, make jet or turbogenerator is simplified and cheap.It also is easily that the rotor of synchronous machine is connected to compressor, and does not use other extra equipment, and for example, coupling or gear-box are because utilized the current connection of compressor with jet or the relevant rotating part of turbogenerator.
Considering and simplify jet or turbogenerator structure, will be easily if the rotor of synchronous machine is fixed on the compressor rotating part.
According to a design easily, the rotor of synchronous machine is fixed on the front portion of compressor wheels, and the stator of synchronous machine is fixed on the compressor wheels front.This is convenient to the manufacturing of jet or turbogenerator, particularly is contained in the hollow space of front portion of compressor wheels when the rotor of synchronous machine.
Simultaneously, the stator of synchronous machine is contained in the nappe easily, and nappe is used for the front center that aerodynamics covers compressor wheels, and nappe is fixed on the inlet shell middle part of jet or turbogenerator by radial rib.This scheme is simple, cheap and reliable.
At least one radial rib is a hollow, is used for the lead that load connects synchronous motor stator and power supply and/or power device as pipeline.
The stator of synchronous machine is contained in the housing that hangs on the nappe easily, and this is simple and cheap.
According to a design easily, the rotor of synchronous machine comprises the hollow permanent magnet with even number of poles, the stator of synchronous machine comprises the electromagnet with polyphase windings, and described polyphase windings is arranged in the rotor cavity of synchronous machine, and polyphase windings is connected to power supply and/or power device.This scheme is particularly suitable for built-in synchronous machine is applied to the compressor wheels front portion.
Design easily according to another, the rotor of synchronous machine comprises the permanent magnet with even number of poles, and be arranged in the cavity of synchronous motor stator, and the stator of synchronous machine comprises the hollow electromagnet with polyphase windings, polyphase windings is connected to power supply and/or power device.This design is suitable for: the built-in synchronous machine in the above-mentioned compressor wheel front portion, and the rotor of synchronous machine is contained on the compressor shaft of compressor wheels back for example, perhaps become another rotating part of the jet or turbogenerator that is connected with compressor, for example, become the turbine on the common shaft with compressor, or the like.
In order to cool off the part of synchronous machine, if, then be easily for the stator and/or the rotor of synchronous machine provides cooling pipe system.
This cover of the present invention overall merit jet or turbogenerator is to reach higher electrical efficiency and does not have maintenance operation.The present invention's another advantage jet or turbogenerator is a synchronous machine torque height, and the synchronous machine with permanent magnet can be used as generator and move under high speed, and additionally need not cause the band that magnetic gap increases between synchronous motor stator and the rotor.Less magnetic gap can use the magnet of less thickness to reach identical output.
Description of drawings
The graphic representation of technical solution of the present invention in the accompanying drawings.Fig. 1 represents to have the single shaft air breathing engine embodiment's of synchronous machine longitudinal profile, and synchronous machine constitutes the electric starter of the suction port of compressor part that is integrated in air breathing engine.Fig. 1 represents along the sectional view of hollow radial rib.
Embodiment
To describe a design implementation example of air breathing engine below, it has compressor section 10 and turbo machine part 11, between the two, has firing chamber 13 on the air flue of compressor compresses, and fuel nozzle 14 has outlet in this firing chamber.Firing chamber 13 also has suitable ignition system, and this is expression in the drawings, is used for the combustion air compressed mixture with fuel of initial point.
Compressor section 10 comprises the rotor wheel 15 of radial compressor, and turbo machine part 11 comprises turbine rotor wheel 16.In the illustrated embodiment, the wheel 15 of radial compressor and the wheel 16 of turbo machine pivot around common shaft 17, and common shaft 17 pivots by the bearing in air breathing engine stationary part or the stator casing 18 19,19 '.
The spin axis of air breathing engine and radial compressor rotating part is provided with the rotor 200 of synchronous machine 2 alignedly.The rotor 200 of synchronous machine 2 is fixed on the suitable rotating part that connects compressor on the air breathing engine, for example, it is contained on the compressor wheels, or is contained on the common shaft 17 of compressor or turbo machine or connects on the air breathing engine on the other rotating part of compressor.The rotor 200 of synchronous machine 2 rotates with the rotating part of compressor, for the required pivot of synchronous machine 2 operations, uses the pivot of air breathing engine appropriate section, for example, and the pivot of the rotation of compressor or common shaft 17, or the like.
In illustrated embodiment, the rotor 200 of synchronous machine 2 is fixed on the front portion of the wheel 15 of radial compressor, perhaps is fixed in the anterior hollow space of wheel 15 of radial compressor.In illustrated embodiment, the rotor 200 that is fixed on the synchronous machine 2 in the anterior hollow space of wheel 15 of radial compressor comprises the magnet ring 20 on the inwall of anterior hollow space of the wheel 15 that is installed in radial compressor.On magnet ring 20, two permanent magnets 21 are housed along direction towards the hollow space free space.In a not shown design implementation example, the rotor 200 of synchronous machine 2 is fixed on the common shaft 17 with turbo machine, perhaps be contained on the turbo machine, or the like.
In the appropriate section of air breathing engine, the stator 201 of synchronous machine 2 is fixed on the stationary part of air breathing engine.The axle of a pair of stator 201 of synchronous machine and rotor 200 aligns and interlocking by known mode, thereby uses as synchronous machine 2.
In illustrated design implementation example, the stator 201 of synchronous machine 2 is fixed on the anterior front of the wheel 15 of radial compressor, for example in nappe 240.Nappe 240 is used for the front center that aerodynamics covers the wheel 15 of radial compressor, and is contained in the middle part of inlet shell 24 of the radial compressor front of air breathing engine by radial rib 27.Stator has polyphase windings 23, thus in the cavity between the permanent magnet 21 of the rotor 200 of the synchronous machine 2 installed in the anterior hollow space of the wheel 15 of radial compressor of stator 201.For example, pass the lead 25 of a hollow radial rib 27 by use, polyphase windings 23 connects the power subsystem of air breathing engine actual bodies outside.In illustrated embodiment, on the housing 29 that polyphase windings 23 is utilized bolt 30 to be contained in to be suspended in the nappe 240.
The stator 201 of synchronous machine 2 and the cooling of rotor 200 are guaranteed by suitable mode.For example, in illustrated embodiment, the cooling that guarantees stator 201 is to be transmitted to radial rib 27 by housing 29 and further to be transmitted to air breathing engine inlet shell 24 by the heat with polyphase windings 23, and the artificial convection of compressor moving air that suck and that around nappe 240, flow, also can pass through hole and gap in the nappe 240, or the like.The cooling of the whole synchronous machine 2 also radial passage 31 in the anterior hollow space of the wheel 15 by radial compressor supports, along the direction from the stator 201 of synchronous machine 2 to rotor 200 back of synchronous machine 2.
In not shown design implementation example, the stator 201 of synchronous machine 2 can be made by different suitable modes with rotor 200, and they also can be integrated on the structure of air breathing engine rotating part and standing part by different suitable modes.
For light, synchronous machine 2 is as driver.After air breathing engine starting, expanding when fuel and air burning blows on the turbine bucket, when compressor keeps rotation, synchronous machine 2 can be used as the current generator operation, directly in air breathing engine, use, perhaps also can use for the external equipment of air breathing engine outside, or the like.
The jet engine design of diagram and explanation above the present invention does not limit, the difference that also can structure setting jet according to each type or turbogenerator draws technical solution of the present invention is revised.One of ordinary skill in the art according to technical solution of the present invention and utilize his/her common professional ability, can be applied to technological scheme of the present invention in the suitable special construction.
Commercial Application
Technical solution of the present invention is applied to jet engine, turbogenerator, etc.

Claims (5)

1. one kind comprises radially or the jet or turbogenerator of diagonal angle compressor, compressor has at least one rotating part that rotates in the standing part of jet or turbogenerator, synchronous machine with the stator of mutual collaborative work and rotor is connected at least one rotating part of compressor, synchronous machine is connected with power supply and/or power device, it is characterized in that, the rotor (200) of synchronous machine (2) is securely fixed in the hollow space of rotor of the jet or turbogenerator that is connected with compressor, and the stator (201) of synchronous machine (2) is positioned on the axle identical with the rotor (200) of synchronous machine (2), and is contained on the standing part of jet or turbogenerator.
2. jet or turbogenerator as claimed in claim 1, it is characterized in that, the stator (201) of synchronous machine (2) is contained on the nappe (240), nappe is used for the front center that aerodynamics covers compressor wheels, and nappe (240) is fixed on middle part jet or turbogenerator inlet shell (24) by radial rib (27).
3. jet or turbogenerator as claimed in claim 2 is characterized in that, at least one radial rib (27) is a hollow, and as the pipeline of lead (25), lead (25) is used to connect the stator (201) and power supply and/or power device of synchronous machine (2).
4. as claim 2 or 3 described jet or turbogenerators, the stator (201) of synchronous machine (2) is contained on the housing (29) that hangs on nappe (240).
5. jet or turbogenerator as claimed in claim 1 is characterized in that, the stator (201) and/or the rotor (200) of synchronous machine (2) are connected to cooling pipe system.
CNB038212609A 2002-09-06 2003-09-03 Jet motor or turbine motor Expired - Lifetime CN100447388C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CZPUV200213449 2002-09-06
CZ200213449U CZ12724U1 (en) 2002-09-06 2002-09-06 Jet or turbine engine

Publications (2)

Publication Number Publication Date
CN1682023A CN1682023A (en) 2005-10-12
CN100447388C true CN100447388C (en) 2008-12-31

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Family Applications (1)

Application Number Title Priority Date Filing Date
CNB038212609A Expired - Lifetime CN100447388C (en) 2002-09-06 2003-09-03 Jet motor or turbine motor

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Country Link
CN (1) CN100447388C (en)
AU (1) AU2003266099A1 (en)
CZ (1) CZ12724U1 (en)
WO (1) WO2004022948A1 (en)

Families Citing this family (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1614855A1 (en) * 2004-07-05 2006-01-11 Siemens Aktiengesellschaft Turbomachine and method to operate such a turbomachine
WO2006060000A1 (en) 2004-12-01 2006-06-08 United Technologies Corporation Variable fan inlet guide vane assembly, turbine engine with such an assembly and corresponding controlling method
US7934902B2 (en) 2004-12-01 2011-05-03 United Technologies Corporation Compressor variable stage remote actuation for turbine engine
WO2006060013A1 (en) 2004-12-01 2006-06-08 United Technologies Corporation Seal assembly for a fan rotor of a tip turbine engine
US8096753B2 (en) 2004-12-01 2012-01-17 United Technologies Corporation Tip turbine engine and operating method with reverse core airflow
US8757959B2 (en) 2004-12-01 2014-06-24 United Technologies Corporation Tip turbine engine comprising a nonrotable compartment
US7883314B2 (en) 2004-12-01 2011-02-08 United Technologies Corporation Seal assembly for a fan-turbine rotor of a tip turbine engine
US7976272B2 (en) 2004-12-01 2011-07-12 United Technologies Corporation Inflatable bleed valve for a turbine engine
DE602004029950D1 (en) 2004-12-01 2010-12-16 United Technologies Corp SLIDED GEAR ASSEMBLY FOR A TOP TURBINE ENGINE
WO2006059970A2 (en) 2004-12-01 2006-06-08 United Technologies Corporation Turbine engine with differential gear driven fan and compressor
DE602004027766D1 (en) 2004-12-01 2010-07-29 United Technologies Corp HYDRAULIC SEAL FOR A GEARBOX OF A TOP TURBINE ENGINE
DE602004020125D1 (en) 2004-12-01 2009-04-30 United Technologies Corp LUBRICANT SUPPLY SYSTEM FOR THE TRANSMISSION OF A TIP TURBINE ENGINE
US7874163B2 (en) 2004-12-01 2011-01-25 United Technologies Corporation Starter generator system for a tip turbine engine
EP1825113B1 (en) 2004-12-01 2012-10-24 United Technologies Corporation Counter-rotating gearbox for tip turbine engine
EP1825116A2 (en) 2004-12-01 2007-08-29 United Technologies Corporation Ejector cooling of outer case for tip turbine engine
US7845157B2 (en) 2004-12-01 2010-12-07 United Technologies Corporation Axial compressor for tip turbine engine
EP2333287A1 (en) 2004-12-01 2011-06-15 United Technologies Corporation Vectoring transition duct for turbine engine
EP1828683B1 (en) 2004-12-01 2013-04-10 United Technologies Corporation Combustor for turbine engine
EP1828591B1 (en) 2004-12-01 2010-07-21 United Technologies Corporation Peripheral combustor for tip turbine engine
US7475545B2 (en) 2005-04-29 2009-01-13 General Electric Company Fladed supersonic missile turbojet
US7448199B2 (en) 2005-04-29 2008-11-11 General Electric Company Self powdered missile turbojet
US7424805B2 (en) 2005-04-29 2008-09-16 General Electric Company Supersonic missile turbojet engine
US7509797B2 (en) 2005-04-29 2009-03-31 General Electric Company Thrust vectoring missile turbojet
US8015828B2 (en) * 2007-04-03 2011-09-13 General Electric Company Power take-off system and gas turbine engine assembly including same
CN103967535A (en) * 2013-02-01 2014-08-06 中国航空工业集团公司西安飞机设计研究所 Refrigeration and electricitygeneration integrated device driven by air turbine
CN106703993A (en) * 2015-11-14 2017-05-24 熵零股份有限公司 Engine
DE102016207517A1 (en) * 2016-05-02 2017-11-02 Siemens Aktiengesellschaft Propulsion system for aircraft with electric generator
GB2567674B (en) * 2017-10-20 2022-04-06 Rolls Royce Plc Motor Generator System for a Gas Turbine Engine
CN109113803A (en) * 2018-11-09 2019-01-01 上海尚实能源科技有限公司 Rotor startup structure for turbogenerator
CN109268168A (en) * 2018-11-26 2019-01-25 北京金朋达航空科技有限公司 Height pushes away the small-size turbojet engine of ratio
CN111828375A (en) * 2020-06-30 2020-10-27 中国航发南方工业有限公司 Split-flow centrifugal impeller and aircraft engine with same
CN115324660A (en) * 2022-08-19 2022-11-11 上海翠日航空科技有限公司 Miniature turbine power generation all-in-one machine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3071691A (en) * 1960-05-31 1963-01-01 Curtiss Wright Corp Shaft support
US3187188A (en) * 1959-07-21 1965-06-01 Curtiss Wright Corp High speed turbo-generator
GB2063366A (en) * 1979-05-14 1981-06-03 Osborn Norbert L Turbocharger and adaptions thereof
US4482303A (en) * 1982-01-27 1984-11-13 Ray Acosta Turbo-compressor apparatus

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1041587A (en) * 1962-08-27 1966-09-07 Bristol Siddeley Engines Ltd Improvements in gas turbine engines
GB1147730A (en) * 1967-12-19 1969-04-02 Rolls Royce Improvements in or relating to gas turbine engines
US3859785A (en) * 1973-12-17 1975-01-14 Curtiss Wright Corp Turbine engine with integral compressor and alternator rotor
US5237817A (en) * 1992-02-19 1993-08-24 Sundstrand Corporation Gas turbine engine having low cost speed reduction drive

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3187188A (en) * 1959-07-21 1965-06-01 Curtiss Wright Corp High speed turbo-generator
US3071691A (en) * 1960-05-31 1963-01-01 Curtiss Wright Corp Shaft support
GB2063366A (en) * 1979-05-14 1981-06-03 Osborn Norbert L Turbocharger and adaptions thereof
US4482303A (en) * 1982-01-27 1984-11-13 Ray Acosta Turbo-compressor apparatus

Also Published As

Publication number Publication date
AU2003266099A1 (en) 2004-03-29
CZ12724U1 (en) 2002-10-23
WO2004022948A1 (en) 2004-03-18
CN1682023A (en) 2005-10-12

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Granted publication date: 20081231