CN101313135B - 具有两级涡轮增压***的内燃机 - Google Patents

具有两级涡轮增压***的内燃机 Download PDF

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CN101313135B
CN101313135B CN2005800521281A CN200580052128A CN101313135B CN 101313135 B CN101313135 B CN 101313135B CN 2005800521281 A CN2005800521281 A CN 2005800521281A CN 200580052128 A CN200580052128 A CN 200580052128A CN 101313135 B CN101313135 B CN 101313135B
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pressure turbine
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CN101313135A (zh
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肯特·伊塞尔莫
拉尔斯·松丁
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Volvo Truck Corp
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D9/00Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/04Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning exhaust conduits
    • F02D9/06Exhaust brakes
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/004Engines characterised by provision of pumps driven at least for part of the time by exhaust with exhaust drives arranged in series
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/013Engines characterised by provision of pumps driven at least for part of the time by exhaust with exhaust-driven pumps arranged in series
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/02Gas passages between engine outlet and pump drive, e.g. reservoirs
    • F02B37/025Multiple scrolls or multiple gas passages guiding the gas to the pump drive
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12Control of the pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12Control of the pumps
    • F02B37/22Control of the pumps by varying cross-section of exhaust passages or air passages, e.g. by throttling turbine inlets or outlets or by varying effective number of guide conduits
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B41/00Engines characterised by special means for improving conversion of heat or pressure energy into mechanical power
    • F02B41/02Engines with prolonged expansion
    • F02B41/10Engines with prolonged expansion in exhaust turbines
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D9/00Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/08Throttle valves specially adapted therefor; Arrangements of such valves in conduits
    • F02D9/12Throttle valves specially adapted therefor; Arrangements of such valves in conduits having slidably-mounted valve members; having valve members movable longitudinally of conduit
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/01Internal exhaust gas recirculation, i.e. wherein the residual exhaust gases are trapped in the cylinder or pushed back from the intake or the exhaust manifold into the combustion chamber without the use of additional passages
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/08Other arrangements or adaptations of exhaust conduits
    • F01N13/10Other arrangements or adaptations of exhaust conduits of exhaust manifolds
    • F01N13/107More than one exhaust manifold or exhaust collector
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B29/00Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
    • F02B29/04Cooling of air intake supply
    • F02B29/0406Layout of the intake air cooling or coolant circuit
    • F02B29/0412Multiple heat exchangers arranged in parallel or in series
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/12Improving ICE efficiencies
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00Fluid handling
    • Y10T137/7722Line condition change responsive valves
    • Y10T137/7837Direct response valves [i.e., check valve type]
    • Y10T137/7869Biased open

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supercharger (AREA)
  • Control Of Turbines (AREA)

Abstract

本发明涉及具有排气管(15,16)和进气管(12)和的内燃机(10),所述排气管(15,16)用于排出来自发动机燃烧室(11)的废气;所述进气管(12)用于提供空气至所述燃烧室。内燃机包括具有高压涡轮(17)和低压涡轮(21)的涡轮增压***,所述高压涡轮(17)与高压压缩机(19)相互作用,所述低压涡轮(21)与低压压缩机(23)相互作用,用于从发动机的废气流中提取能量并增加发动机的进气的压力。高压涡轮(17)通过管路(20)连接至低压涡轮(21)。废气压力调节器(20a)位于高压涡轮(17)和低压涡轮(21)之间的管路(20)内。

Description

具有两级涡轮增压***的内燃机
技术领域
本发明涉及具有排气管、进气管和涡轮增压***的内燃机,所述排气管用于排出来自发动机燃烧室的废气,所述进气管用于提供空气至所述燃烧室,所述涡轮增压***具有高压涡轮和低压涡轮,所述高压涡轮与高压压缩机相互作用,所述低压涡轮与低压压缩机相互作用,涡轮增压***用于从发动机的废气气流中提取能量并增加发动机的进气的压力,所述高压涡轮通过管路连接至所述低压涡轮。
背景技术
用于重型车辆的柴油发动机通常要求较大的空间,因为它们具有各种用于增压、冷却和废气后处理的***。例如,存在具有二级增压的涡轮增压***,其通常基于为单级增压而设计的标准装置。
废气压力调节器用于多种类型的发动机中,以在排气***内生成背压,例如以便改善四冲程内燃机的制动力。此外,可以利用来自废气压力调节器的背压,以增加进入进气侧的再循环气体(所谓的EGR气体)的量。此外,当起动时,可以利用背压来更快速地加热发动机。废气压力调节器通常位于涡轮增压***的下游,以免对发动机的效率带来负面影响。
发明内容
因此,本发明的一个目的是实现一种具有两级涡轮增压***和废气压力调节器的内燃机,所述废气压力调节器不会在空间和重量方面形成显著需求。
为实现此目的,根据本发明设计的内燃机包括排气管、进气管和涡轮增压***,所述排气管用于排出来自发动机燃烧室的废气,所述进气管用于提供空气至所述燃烧室,所述涡轮增压***具有高压涡轮和低压涡轮,所述高压涡轮与高压压缩机相互作用,所述低压涡轮与低压压缩机相互作用,用于从发动机的废气流中提取能量并增加发动机的进气的压力,所述高压涡轮通过管路连接至所述低压涡轮,并且,根据本发明,所述内燃机的特征在于:废气压力调节器设置在高压涡轮和低压涡轮之间的管路内。由于根据本发明的废气压力调节器的位置设置,可以利用现有的涡轮增压***中的部件来进行废气压力调节,其结果是节约了空间和重量。
可以从所附的从属权利要求中得出本发明的有利的实施例。
附图说明
下面将参照附图中示出的实施例对本发明进行更详细的描述,其中
图1示意性地示出了根据本发明的具有两级涡轮增压***和废气压力调节器的内燃机,
图2是包含在涡轮增压***内的两个涡轮增压级的纵剖面图,
图3是管路的纵剖面图,所述管路连接包含在涡轮增压***内的两个涡轮增压级,并且包括显示为处于开启工作位置的废气压力调节器,以及
图4是与图3相对应的纵剖面图,其示出了处于关闭工作位置的废气压力调节器。
具体实施方式
本发明主要涉及活塞冲程排量大约为6至20升之间的柴油发动机,优选地是用于重型车辆比如卡车、公共汽车和工程机械。通过具有中间冷却的两个串联的径向型压缩机的两级机构实现增压。第一压缩机级称为低压压缩机,其由轴向式低压涡轮驱动。第二压缩机级称为高压压缩机,其由径向型高压涡轮驱动。
图1示出了具有六个汽缸11的发动机体10,所述汽缸以传统的方式连通进气歧管12和两个分开的排气歧管13、14。这两个排气歧管中的每一个都接收来自三个发动机气缸的排出废气。排出废气通过分开的管路15、16输送至位于高压涡轮单元18内的涡轮17,所述高压涡轮单元18包括与涡轮17一起安装在公共轴上的压缩机19。
排出废气通过具有废气压力调节器20a的管路20输送至位于低压涡轮单元22内的涡轮21,所述低压涡轮单元22包括与涡轮21一起安装在公共轴上的压缩机23。排出废气最终通过管路24输送至发动机的排气***,所述排气***包括用于对排出废气进行后处理的装置。
过滤后的进气通过管路25进入发动机,并且被输送至低压涡轮单元22的压缩机23。通过第一中间冷却器27,管路26将进气输送至高压涡轮单元18的压缩机19。在经过此具有中间冷却的二级增压之后,进气通过管路28输送至第二中间冷却器29,其后,进气通过管路30到达进气歧管12。
图2更详细地示出了涡轮增压***,其清楚地示出了至高压涡轮17的两个螺旋状的入口15、16,所述各入口经由进气导管17a向涡轮提供气流。高压涡轮17是径向式,并且通过较短的中间管路20连接至低压涡轮21,由于低压涡轮是轴向式,所以可以使用较短的中间管路20。此短的流动通道使涡轮增压级之间的压力损失最小化。
高压涡轮17与高压压缩机19一起安装在轴31上。以相应的方式,低压涡轮21与低压压缩机23一起安装在轴32上。两个涡轮单元18、22基本上沿着相同的纵向轴布置。中间管路20装配密封件,该密封件通过允许由热量力(thermal force)引起的一定程度的轴向运动和径向运动以及一定程度的装配公差,抑制内应力和泄漏。废气压力调节器20a位于管路20内,下面将对其进行更详细的描述。
轴向式低压涡轮设置有具有进气导管的固定环34。高压压缩机19是径向式压缩机。出口扩压器37设置在低压涡轮21后面,以便恢复来自涡轮的动压。扩压器通向废气收集器38,所述废气收集器38引导废气至排气管24。
图3和4中更详细地示出了废气压力调节器20a的设计,管路20具有由外壁39和中心部40构成的环形横截面,所述外壁39环绕其旋转轴线对称且具有这样的横截面,该横截面在朝向低压涡轮21的方向上尺寸增大,所述中心部40同心地设置在壁39内,其横截面同样在朝向低压涡轮的方向上尺寸增大。
中心部40安装在轴41的端部上,与固定环34相距一定的距离,所述轴41接附至固定环,并且,所述中心部40包括控制活塞42,所述控制活塞42以可移动的方式安装在轴41上。控制活塞42包括具有外阀套筒44的内活塞室43。其被设计成一个具有外壁表面和内壁表面的开口汽缸。
控制活塞42可以在中心部和外壁39之间相对于螺旋压簧45的作用而轴向移动,以调节管路20的流通面积。控制活塞42和轴41一起形成环形室43,环形室43通过用于加压介质的管路47连接至用于废气压力调节器外部的加压介质(附图中未示出)的连接部分,所述加压介质部分穿过轴41的具有较大直径的部分以及部分穿过固定环34。
通过改变室43的排量,控制活塞42因此能在加压介质例如压缩空气的作用下,与阀套44一起在不激活的开启位置和激活的封闭位置之间移动,所述加压介质的作用方向与压缩弹簧的作用力的方向相反。在不激活的控制位置(参见图3),阀套44在中心部和固定环34之间形成中心部40的轴向延伸部分。在激活的控制位置(参见图4),阀套44的内壁表面在外壁和中心部40之间形成外壁39的轴向延伸部分。
控制活塞42的环形端面48形成活塞表面,在控制活塞运动期间,所述活塞表面与中心部40的圆柱形部分49内的装配密封件一起滑动。因此,中心部的内部形成室50,所述室50通过管路51与高压涡轮17的紧接着的下游的压力相通。此外,存在开口52,其平衡低压涡轮21的上游侧的压力与中心部40的圆柱形部分49外部的空间内的压力。由于室50设置在中心部40内,所以能够以适当的方式确定活塞的面积,以便实现废气压力调节器的压力平衡,使其根据废气流利用自调节功能来自动地进行调节。
当废气压力调节器根据图4激活时,高压涡轮17下游的压力升高(由于气体是可压缩的,所示存在一定的延迟)。压力通过管路51传播入室50。压力平衡后,由于面积相对类似(室50的面积稍大),所以此压力将大致与室43内的控制压力相同。例如,如果阀上游的压力增加,以致室43内的控制压力过高,那么此压力将通过管路51进入室50,并且将作用在端面48上。当控制活塞42已稍微向左移动时,将出现平衡,并且控制活塞找到平衡位置。
因此,如上所述的废气压力调节器具有自调节功能,并且当在上游侧具有一定压力时自动开启。此外,由于密封件具有气密性,所以能够在废气压力调节器的上游快速地建立起压力。
上面以用于内燃机增压的具有两级涡轮增压***的应用场合对本发明进行了描述。可选地,本发明可用于具有涡轮增压器装置和涡轮组合装置的应用场合,其中力可以在涡轮组合装置和内燃机的曲轴之间传递,以便为不同的目的来利用动能。
不能认为本发明仅仅限于如上所述的实施例,多种变型与改进可能处于所附权利要求的范围之内。例如,本发明是参照六缸柴油机进行描述,但是本***可以用于不同的活塞发动机,从单缸至多缸;可以用于二冲程发动机或四冲程发动机。本发明还可以用于船舶发动机,用于具有不同活塞冲程排量的上述发动机。上面已经描述了轴向式低压涡轮的实施例,但是,本发明还可以用于径向式低压涡轮。气动装置以外的其他装置可以用于操作阀套,例如机械装置。

Claims (8)

1.一种具有排气管(15,16)、进气管(12)和涡轮增压***的内燃机(10),所述排气管(15,16)用于排出来自内燃机燃烧室(11)的废气,所述进气管(12)用于提供空气至所述燃烧室,所述涡轮增压***具有高压涡轮(17)和低压涡轮(21),所述高压涡轮(17)与高压压缩机(19)相互作用,所述低压涡轮(21)与低压压缩机(23)相互作用,用于从内燃机的废气气流中提取能量并增加内燃机的进气的压力,所述高压涡轮(17)通过管路(20)连接至低压涡轮(21),废气压力调节器(20a)位于所述高压涡轮(17)和所述低压涡轮(21)之间的管路(20)内,所述低压涡轮(21)为轴向式,所述高压涡轮为径向式,其中,所述管路(20)具有由外壁(39)和中心部(40)构成的环形横截面,所述外壁(39)环绕其旋转轴线对称并且具有在朝向所述低压涡轮(21)的方向上尺寸增大的横截面,其特征在于,所述中心部(40)同心地设置在所述外壁内,且横截面同样在朝向所述低压涡轮的方向上尺寸增大,设置在轴(41)端部上的所述中心部(40)设置有控制活塞(42),所述轴(41)附接至安装在所述低压涡轮(21)的入口上的固定环(34),所述控制活塞(42)以能够在所述中心部和所述外壁(39)之间移动的方式安装在所述中心部上,用于调节所述管路的流通面积,且所述控制活塞(42)以能够滑动的方式安装在所述轴(41)上。
2.如权利要求1所述的内燃机,其特征在于:所述控制活塞(42)能相对于弹簧装置(45)的作用力在两个端部位置之间移动。
3.如权利要求2所述的内燃机,其特征在于:通过加压介质的作用,所述控制活塞(42)能在不激活的开启位置和激活的关闭位置之间移动,所述加压介质的作用方向与所述弹簧装置(45)的作用力的方向相反。
4.如权利要求3所述的内燃机,其特征在于:所述控制活塞(42)和所述轴(41)一起形成环形室(43),所述环形室(43)对于加压介质具有可变排量。
5.如权利要求4所述的内燃机,其特征在于:所述环形室(43)通过用于加压介质的管路(47)连接至用于连接高压涡轮和低压涡轮的所述管路(20)外部的加压介质的连接部分,所述用于加压介质的管路(47)延伸穿过所述轴(41)和所述固定环(34)。
6.如权利要求1-5中任何一项所述的内燃机,其特征在于:所述控制活塞(42)设置有活塞表面(48),所述活塞表面(48)能在所述中心部(40)的内部室(50)中移动,并且通过另一管路(51)承受所述废气压力调节器(20a)的上游的压力的作用,用于所述废气压力调节器的控制压力的压力平衡。
7.如权利要求1-5中任何一项所述的内燃机,其特征在于:所述控制活塞(42)被设计成具有外壁表面和内壁表面的开口汽缸,该外壁表面在不激活的控制位置在所述中心部和所述固定环(34)之间形成所述中心部(40)的轴向延伸部分,该内壁表面在激活的控制位置在所述外壁和所述中心部(40)之间形成所述外壁(39)的轴向延伸部分。
8.如权利要求6所述的内燃机,其特征在于:所述控制活塞(42)被设计成具有外壁表面和内壁表面的开口汽缸,该外壁表面在不激活的控制位置在所述中心部和所述固定环(34)之间形成所述中心部(40)的轴向延伸部分,该内壁表面在激活的控制位置在所述外壁和所述中心部(40)之间形成所述外壁(39)的轴向延伸部分。
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