CN111655991A - 附件传动箱 - Google Patents

附件传动箱 Download PDF

Info

Publication number
CN111655991A
CN111655991A CN201880065342.8A CN201880065342A CN111655991A CN 111655991 A CN111655991 A CN 111655991A CN 201880065342 A CN201880065342 A CN 201880065342A CN 111655991 A CN111655991 A CN 111655991A
Authority
CN
China
Prior art keywords
centrifugal impeller
oil
air
centrifugal
housing
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.)
Granted
Application number
CN201880065342.8A
Other languages
English (en)
Other versions
CN111655991B (zh
Inventor
K·A·斯蒂亚日科夫
R·Z·哈萨诺夫
A·V·契尔科夫
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.)
United Engine Manufacturing Group Co ltd
Original Assignee
United Engine Manufacturing Group Co ltd
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 United Engine Manufacturing Group Co ltd filed Critical United Engine Manufacturing Group Co ltd
Publication of CN111655991A publication Critical patent/CN111655991A/zh
Application granted granted Critical
Publication of CN111655991B publication Critical patent/CN111655991B/zh
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C7/00—Features, 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
    • F02C7/32—Arrangement, mounting, or driving, of auxiliaries
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M13/00—Crankcase ventilating or breathing
    • F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C7/00—Features, 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
    • F02C7/06—Arrangements of bearings; Lubricating
    • 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
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/027—Gearboxes; Mounting gearing therein characterised by means for venting gearboxes, e.g. air breathers
    • 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
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0402—Cleaning of lubricants, e.g. filters or magnets
    • 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
    • F16N—LUBRICATING
    • F16N39/00—Arrangements for conditioning of lubricants in the lubricating system
    • F16N39/002—Arrangements for conditioning of lubricants in the lubricating system by deaeration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M13/00—Crankcase ventilating or breathing
    • F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
    • F01M2013/0422—Separating oil and gas with a centrifuge device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/70—Slinger plates or washers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/60—Fluid transfer
    • F05D2260/609—Deoiling or demisting
    • 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
    • F16N—LUBRICATING
    • F16N2210/00—Applications
    • F16N2210/02—Turbines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T50/00—Aeronautics or air transport
    • Y02T50/60—Efficient propulsion technologies, e.g. for aircraft

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Details Of Gearings (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
  • Separating Particles In Gases By Inertia (AREA)
  • Centrifugal Separators (AREA)

Abstract

本发明涉及航空发动机制造领域，具体涉及燃气涡轮发动机(GTE)润滑系统的元件。附件传动箱包含齿轮、支管、轴承、带叶片的离心式叶轮。带叶片的离心式叶轮包含可以形成内腔的外壳、用于油气混合物入口和空气出口的开口、以及用于油排放的开口，所述叶片具有不同长度并且与所述齿轮旋转轴线成角度α和β定位。此外，所述离心式叶轮可包含弯曲叶片。此外，所述离心式叶轮具有至少两个串置安装的油/空气分离级。具有上述独特特征的所提出的发明的实施与已知特征相结合能够改进组装技术，减小附件传动箱的轮廓尺寸和重量，改善油的分离。

Description

附件传动箱
技术领域
本发明涉及航空发动机制造领域，具体涉及燃气涡轮发动机(GTE)润滑系统的元件。
背景技术
包含具有轴流式叶轮的壳体的离心式呼吸器的设计是已知的(2015年5月27日公开的专利RU NO.2551454，IPC F02C7/06)。已知呼吸器的缺点是离心式呼吸器壳体的外部位置以及将其附接到附件传动箱和旁通油阀的紧固件占用了大量的占地面积，并且不能紧凑地安置相邻单元，从而增大了附件传动箱(AGB)的轮廓尺寸和重量。此外，呼吸器壳体中存在调油螺纹增加了工厂的劳动时间和制造成本。
包括安装有叶轮的齿轮的离心呼吸器的设计(2015年4月20日公开的RU专利号2548228，IPC F02C7/06)也是已知的。已知的离心呼吸器的缺点是离心呼吸器壳体的外部位置，其与将其附接到AGB上的紧固件和用于气-油混合物的入口配件一起占用了很大的占地面积，并且不能紧凑地安置相邻的呼吸器，从而增大了AGB的轮廓尺寸和重量。呼吸器中存在螺旋沟槽调油螺纹也增加了工厂的劳动时间和制造成本。
就所获得的技术本质和技术结果而言最接近提出的发明并由作者选择为原型的是附件传动箱(2015年4月10日公开的专利RU No.2547539，IPC F02C7/06)。该原型的缺点是存在离心式呼吸器壳体(附接到AGB上)，其与将其附接到AGB壳体上的紧固件和油旁路凸缘一起占用了很大的占地面积，并且无法紧凑地定位相邻单元，从而增大了AGB的轮廓尺寸和重量。
发明内容
所提出的发明的技术问题是改进组装技术减小附件传动箱轮廓尺寸以及保证油分离效率。
技术问题由于以下事实而得到解决：附件传动箱包含齿轮、支管/喷嘴、轴承、带有叶片的离心式叶轮，根据本发明，带有叶片的离心式叶轮包含可以形成内腔的外壳、用于气-油混合物进入和空气排出的窗口，排油口，叶片具有不同的长度并且定位成与齿轮旋转轴线成角度α和β。
此外，根据本发明，离心式叶轮具有弯曲叶片。
此外，根据本发明，离心式叶轮包含至少两个相继布置的油和空气分离级。
在所提出的发明中，与原型相反，包括齿轮和带有叶片的离心式叶轮的离心式呼吸器(无位置标记)位于AGB油腔内；因此，离心式叶轮包含：外壳，用于气-油混合物进入与分离和空气排出的窗口，以及排油口，其中可以形成内腔和叶片相对于齿轮轴线的不同角度位置，这改善了油分离效率，以减少零件数量为代价简化了装配技术。离心式呼吸器在附件传动箱内的位置减小了传动箱的轮廓尺寸，因为省去了离心式呼吸器。
附图说明
图1示出了附件传动箱的剖视图。
图2示出了离心式叶轮的剖视图。
图3示出了离心式叶轮的侧视图。
图4示出了带有弯曲叶片的离心式叶轮。
图5示出了具有相继布置的两个油和空气分离级的离心式叶轮。
具体实施方式
附件传动箱1(图1，图2，图3)包含齿轮2、支管3、轴承4、带有叶片7的离心式叶轮5；离心式叶轮包含可以形成空腔的外壳6，以及用于气-油混合物的入口的窗口8、空气出口窗口9和用于排出分离的油的开口10；叶轮5的叶片7被制成为具有不同的长度11、12，并且相对于齿轮2的旋转轴线13以角度α和β定位。
附件传动箱的设计操作如下。
位于附件传动箱的壳体1中的离心式呼吸器(无位置标记)包含齿轮2，齿轮2上安装了离心式叶轮5。离心式叶轮具有外壳6和与齿轮2轴线成不同角度α和β定位的不同长度11、12的叶片7，这导致形成相互连接的相邻的空腔，空腔的窗口确保了来自AGB空腔的气-油混合物8的进入、空气的出口9和分离出的油经由开口10的排出。在“较短”叶片11的壁对气-油混合物流导流期间，流从叶轮叶片的根部平顺地移动至周边，其中离心力场强度较高且油与气体分离的过程更有效。为了排出分离的油，在外壳中存在专门的开口10，并且在叶轮轴上存在与齿轮2中的开口对准的开口9，在过压作用下，空气中的油被清除掉。图1示出了油气分离的一级。由于离心式呼吸器(无位置标记)位于油腔内部，因此在AGB壳体的外表面上，仅用于空气出口的支管3的轮廓尺寸比在使用具有外壳体布置的离心式呼吸器的情况下小得多。因此，各单元可以以更紧凑的方式位于外表面上，这又减小了被驱动单元的轮廓尺寸。此外，离心式叶轮可包含弯曲叶片(图4)，这些叶片确保了移除的排油开口与空气出口窗口之间的距离，从而改善油的分离。此外，离心式叶轮可包含至少两个相继布置的油和空气分离级(图5)，其中第一级的空气出口窗口是第二级的入口窗口，而在最后一级，空气出口窗口位于离心式叶轮轴上。在每一级的外壳中都有用于排油的开口。这种设计也改善了油的分离。
因此，具有上述独特特征的所提出的发明的实施与已知特征相结合能够改进组装技术，减小附件传动箱的轮廓尺寸和重量，改善油的分离。

Claims (3)

1.一种附件传动箱，其包含齿轮、支管、轴承、带叶片的离心式叶轮，其特征在于，所述带叶片的离心式叶轮包含可以形成内腔的外壳、用于油气混合物入口和空气出口的窗口，以及排油口，所述叶片具有不同长度并且与所述齿轮的旋转轴线成角度α和β定位。
2.根据权利要求1所述的附件传动箱，其特征在于，所述离心式叶轮具有弯曲叶片。
3.根据权利要求1所述的附件传动箱，其特征在于，所述离心式叶轮具有至少两个相继布置的油和空气分离级。
CN201880065342.8A 2017-10-05 2018-10-03 附件传动箱 Active CN111655991B (zh)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
RU2017135497 2017-10-05
RU2017135497A RU2667251C1 (ru) 2017-10-05 2017-10-05 Коробка приводных агрегатов
PCT/RU2018/000645 WO2019070159A1 (ru) 2017-10-05 2018-10-03 Коробка приводных агрегатов

Publications (2)

Publication Number Publication Date
CN111655991A true CN111655991A (zh) 2020-09-11
CN111655991B CN111655991B (zh) 2024-01-26

Family

ID=63580356

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201880065342.8A Active CN111655991B (zh) 2017-10-05 2018-10-03 附件传动箱

Country Status (6)

Country Link
US (1) US20200400052A1 (zh)
EP (1) EP3693574A4 (zh)
CN (1) CN111655991B (zh)
CA (1) CA3078282C (zh)
RU (1) RU2667251C1 (zh)
WO (1) WO2019070159A1 (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113550828A (zh) * 2021-07-08 2021-10-26 中国航发湖南动力机械研究所 一种航空发动机分体式离心通风器结构
CN114856819A (zh) * 2021-02-03 2022-08-05 中国航发商用航空发动机有限责任公司 油气分离装置和航空发动机

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113154012A (zh) * 2021-04-29 2021-07-23 中国航发沈阳发动机研究所 一种离心通风器与齿轮轴的安装结构
CN116438948B (zh) * 2023-04-22 2024-01-26 青岛郁金香机械有限公司 一种动力驱动耙

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2747514A (en) * 1952-07-22 1956-05-29 Edwards Miles Lowell Scavenge line centrifuge
GB1413095A (en) * 1974-02-01 1975-11-05 Ametek Inc Multi-function fluid pump
US5114446A (en) * 1991-02-15 1992-05-19 United Technologies Corporation Deoiler for jet engine
US5716423A (en) * 1995-12-21 1998-02-10 United Technologies Corporation Multi-stage deoiler with porous media
CN101208521A (zh) * 2005-06-16 2008-06-25 艾格泵业有限公司 离心泵
CN101619677A (zh) * 2007-11-28 2010-01-06 通用电气公司 旋涡式气-油分离器系统
CN103307023A (zh) * 2012-03-12 2013-09-18 日本电产株式会社 离心风扇
CN203264880U (zh) * 2013-05-09 2013-11-06 天津商业大学 离心叶轮式油分离装置
RU2548228C1 (ru) * 2014-03-18 2015-04-20 Открытое акционерное общество "Уфимское моторостроительное производственное объединение" ОАО "УМПО" Центробежный суфлер
US20150352477A1 (en) * 2013-02-28 2015-12-10 Kawasaki Jukogyo Kabushiki Kaisha Mist separator
US20170145856A1 (en) * 2015-11-24 2017-05-25 General Electric Company Cylindrical air guide in a turbine engine

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4093401A (en) * 1976-04-12 1978-06-06 Sundstrand Corporation Compressor impeller and method of manufacture
US4653976A (en) * 1982-09-30 1987-03-31 General Electric Company Method of compressing a fluid flow in a multi stage centrifugal impeller
FR2742804B1 (fr) * 1995-12-20 1998-01-16 Snecma Rotor deshuileur pour enceinte de lubrification
US6663347B2 (en) * 2001-06-06 2003-12-16 Borgwarner, Inc. Cast titanium compressor wheel
US6790016B2 (en) * 2002-02-04 2004-09-14 Ching-Yuan Chiang Motor and its blade unit
DE102007017822A1 (de) * 2007-04-16 2008-10-23 Continental Automotive Gmbh Abgasturbolader
FR2943103B1 (fr) * 2009-03-13 2011-05-27 Turbomeca Compresseur axialo-centrifuge a angle de rake evolutif
IL212729A (en) * 2011-05-05 2015-03-31 Rafael Advanced Defense Sys Compressor and fan integrated impeller
RU2547539C1 (ru) * 2014-03-20 2015-04-10 Открытое акционерное общество "Уфимское моторостроительное производственное объединение" ОАО "УМПО" Приводной центробежный суфлер для высокотемпературного газотурбинного двигателя
RU2551454C1 (ru) * 2014-04-17 2015-05-27 Открытое акционерное общество "Уфимское моторостроительное производственное объединение" ОАО УМПО Приводной центробежный суфлер газотурбинного двигателя
US9957975B2 (en) * 2015-06-01 2018-05-01 Corey B. Kuhns Angular velocity stepping and methods of use in turbomachinery
US10221858B2 (en) * 2016-01-08 2019-03-05 Rolls-Royce Corporation Impeller blade morphology

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2747514A (en) * 1952-07-22 1956-05-29 Edwards Miles Lowell Scavenge line centrifuge
GB1413095A (en) * 1974-02-01 1975-11-05 Ametek Inc Multi-function fluid pump
US5114446A (en) * 1991-02-15 1992-05-19 United Technologies Corporation Deoiler for jet engine
US5716423A (en) * 1995-12-21 1998-02-10 United Technologies Corporation Multi-stage deoiler with porous media
CN101208521A (zh) * 2005-06-16 2008-06-25 艾格泵业有限公司 离心泵
CN101619677A (zh) * 2007-11-28 2010-01-06 通用电气公司 旋涡式气-油分离器系统
CN103307023A (zh) * 2012-03-12 2013-09-18 日本电产株式会社 离心风扇
US20150352477A1 (en) * 2013-02-28 2015-12-10 Kawasaki Jukogyo Kabushiki Kaisha Mist separator
CN203264880U (zh) * 2013-05-09 2013-11-06 天津商业大学 离心叶轮式油分离装置
RU2548228C1 (ru) * 2014-03-18 2015-04-20 Открытое акционерное общество "Уфимское моторостроительное производственное объединение" ОАО "УМПО" Центробежный суфлер
US20170145856A1 (en) * 2015-11-24 2017-05-25 General Electric Company Cylindrical air guide in a turbine engine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114856819A (zh) * 2021-02-03 2022-08-05 中国航发商用航空发动机有限责任公司 油气分离装置和航空发动机
CN114856819B (zh) * 2021-02-03 2023-12-22 中国航发商用航空发动机有限责任公司 油气分离装置和航空发动机
CN113550828A (zh) * 2021-07-08 2021-10-26 中国航发湖南动力机械研究所 一种航空发动机分体式离心通风器结构
CN113550828B (zh) * 2021-07-08 2022-06-03 中国航发湖南动力机械研究所 一种航空发动机分体式离心通风器结构

Also Published As

Publication number Publication date
CA3078282A1 (en) 2019-04-11
WO2019070159A1 (ru) 2019-04-11
CN111655991B (zh) 2024-01-26
US20200400052A1 (en) 2020-12-24
CA3078282C (en) 2022-06-21
EP3693574A1 (en) 2020-08-12
EP3693574A4 (en) 2021-05-26
RU2667251C1 (ru) 2018-09-18

Similar Documents

Publication Publication Date Title
CN111655991B (zh) 附件传动箱
US8511967B2 (en) Gearbox assembly
CN109139256B (zh) 入口预旋流燃气涡轮发动机
RU2706098C2 (ru) Статор авиационного газотурбинного двигателя и авиационный газотурбинный двигатель
CN104395561B (zh) 具有改进排出系统的涡轮增压器支撑壳体
RU2525054C1 (ru) Центробежно-шестеренный насос
CA2511424A1 (en) Flow structure for a turbocompressor
EP3056740B1 (en) Optimized circumferential groove casing treatment for axial compressors
EP1216359B1 (en) Centrifugal pump
WO2014004344A1 (en) Turbocharger support housing having alignment features
EP2458154A1 (en) Rotor disk with asymmetrical rotor blade slot, corresponding blade and manufacturing method
WO2014004347A1 (en) Bearing support for a turbocharger
EP2966280A1 (en) Turbocharger
JP6461888B2 (ja) ターボファンエンジンで使用するためのケーシングおよびそれから流体を排出する方法
CN112823236B (zh) 用于飞行器涡轮发动机的辅助油箱
US2042550A (en) Supercharger for internal combustion engines
EP3677751A1 (en) Gas turbine engine bifurcation
RU2623854C1 (ru) Способ смазки и охлаждения передней опоры ротора газотурбинного двигателя
RU2467209C2 (ru) Устройство контуров отбора воздуха, ступень компрессора, содержащая такое устройство, компрессор, содержащий такую ступень, и турбореактивный двигатель, содержащий такой компрессор
CN111043077B (zh) 飞行器燃气涡轮发动机叶片桨距改变机构
CN114076035B (zh) 具有初级和次级气流路径的空气涡轮启动器
RU74978U1 (ru) Двухсекционный центробежно-шестеренный насос
RU2530968C1 (ru) Маслосистема авиационного газотурбинного двигателя
RU2566361C1 (ru) Спиральный корпус осевого компрессора высокого давления
CN111425395A (zh) 一种利于排液的多段式罗茨真空泵

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant