CN201513259U - Series two-stage supercharged engine exhaust gas recirculation multi-circuit device - Google Patents
Series two-stage supercharged engine exhaust gas recirculation multi-circuit device Download PDFInfo
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Abstract
串联式两级增压发动机废气再循环多回路装置,属于内燃机技术领域。本实用新型包括发动机、高压级增压器、低压级增压器、高压级进气管、高压级排气管、高压级EGR管,中压级进气管、中压级排气管、中压级EGR管,低压级进气管、低压级排气管、低压级EGR管,三条EGR管路上分别置有控制阀。通过选择EGR回路单独或组合工作保证发动机在各工况下都获得足够的EGR流量且尽量利用较高压级的EGR回路,降低压气机的耗功和高温排气对压气机的损害。本实用新型设计合理,结构简单,适用于对EGR有高要求的串联式两级增压发动机。
The utility model relates to a serial two-stage supercharging engine exhaust gas recirculation multi-circuit device, which belongs to the technical field of internal combustion engines. The utility model comprises an engine, a high-pressure supercharger, a low-pressure supercharger, a high-pressure intake pipe, a high-pressure exhaust pipe, a high-pressure EGR pipe, a medium-pressure air intake pipe, a medium-pressure exhaust pipe, and a medium-pressure exhaust pipe. EGR pipes, low-pressure stage intake pipes, low-pressure stage exhaust pipes, low-pressure stage EGR pipes, and control valves are respectively arranged on the three EGR pipes. By selecting the EGR circuit to work alone or in combination, the engine can obtain sufficient EGR flow under various working conditions and use the EGR circuit with a higher pressure level as much as possible to reduce the power consumption of the compressor and the damage of the high-temperature exhaust to the compressor. The utility model has a reasonable design and a simple structure, and is suitable for a serial two-stage supercharging engine with high requirements on EGR.
Description
技术领域technical field
本实用新型涉及一种发动机的废气再循环(EGR)装置,特别是一种适用于串联式两级增压发动机废气再循环多回路装置,属于内燃机技术领域。The utility model relates to an exhaust gas recirculation (EGR) device of an engine, in particular to a multi-circuit device for exhaust gas recirculation of a serial two-stage supercharged engine, which belongs to the technical field of internal combustion engines.
背景技术Background technique
EGR技术是一种有效的降低内燃机NOx排放的方法。随着排放法规的越来越严格,要求有更多的EGR流量从内燃机的排气端引入进气端,并且以往不需要进行EGR的运行工况点(例如,外特性和标定工况)为了满足新排放法规也需要引入EGR。在和增压系统配合使用时,一种EGR系统是把废气从涡轮前引入到压气机后,形成高压级回路。但由于增压系统运行情况随发动机工况点改变而改变,涡轮前的压力不能总保持大于压气机后的压力,尤其是当发动机工作在中高转速大负荷阶段,由于废气能量较高,使得压气机后压力大于涡轮前压力,如不采取额外措施则排气不能通过EGR管流入进气管。另一种EGR的布置是将排气从涡轮的出口引入到压气机的进口,形成低压级回路。这种布置下可以在发动机全工况下实现EGR流所需要的压差,但高温排气流经压气机会浪费压气机的压缩功并且带来损坏压气机的风险。EGR technology is an effective way to reduce NOx emissions from internal combustion engines. As emission regulations become more and more stringent, more EGR flow is required to be introduced from the exhaust end of the internal combustion engine to the intake end, and the operating conditions (such as external characteristics and calibration conditions) that did not require EGR in the past are for Meeting new emissions regulations also requires the introduction of EGR. When used in conjunction with a supercharging system, an EGR system introduces exhaust gas from before the turbine to after the compressor to form a high-pressure stage circuit. However, since the operation of the supercharging system changes with the change of the engine operating point, the pressure in front of the turbine cannot always be kept greater than the pressure behind the compressor, especially when the engine is working at a stage of medium-high speed and heavy load, due to the high energy of the exhaust gas, the compressor The pressure behind the engine is greater than the pressure in front of the turbine. If no additional measures are taken, the exhaust gas cannot flow into the intake pipe through the EGR pipe. Another EGR arrangement is to introduce exhaust gas from the outlet of the turbine to the inlet of the compressor, forming a low-pressure stage circuit. Under this arrangement, the pressure difference required by the EGR flow can be achieved under the full operating conditions of the engine, but the high-temperature exhaust gas flowing through the compressor will waste the compression work of the compressor and bring the risk of damage to the compressor.
实用新型内容Utility model content
为了克服已有技术的不足,本实用新型提供了一种改善两级增压发动机废气再循环能力的多回路EGR装置。根据发动机工况的变化,选择合适的EGR回路工作,实现系统所需的EGR流量。尽可能的利用较高压级的EGR回路,在较高压级的EGR回路无法实现EGR流时用阀将其关闭并采用低一级的EGR回路,使发动机在各个工况下都能获得所需的EGR流量并降低排气对压气机的损害,该实用新型还可以同时实现EGR回路的组合以满足更大EGR流量的需求。In order to overcome the deficiencies of the prior art, the utility model provides a multi-circuit EGR device for improving the exhaust gas recirculation capability of a two-stage supercharged engine. According to the change of the engine working condition, select the appropriate EGR circuit to work to realize the EGR flow required by the system. Make use of the higher-pressure EGR circuit as much as possible, and use a valve to close it when the higher-pressure EGR circuit cannot realize the EGR flow, and use a lower-level EGR circuit, so that the engine can obtain the required flow in each working condition. The EGR flow rate can be reduced and the damage to the compressor caused by the exhaust gas can be reduced. This utility model can also realize the combination of EGR circuits to meet the demand for greater EGR flow rate.
为实现上述目的本实用新型所采用的技术方案是:该装置包括低压级进气管、低压级压气机、中压级进气管、高压级压气机、高压级进气管、中冷器、进气总管、进气歧管、发动机、排气歧管、高压级排气管、高压级涡轮、中压级排气管、低压级涡轮、低压级排气管、旁通管、旁通阀、高压级连接轴、低压级连接轴、高压级EGR管、中压级EGR管、低压级EGR管、高压级EGR控制阀、中压级EGR控制阀,低压级EGR控制阀,高压级EGR冷却器、中压级EGR冷却器和低压级EGR冷却器,低压级进气管的一端和低压级压气机的入口相连接,另一端通大气。中压级进气管连接在低压级压气机的出口和高压级压气机的入口之间,高压级进气管连接在高压级压气机的出口和中冷器的入口之间,进气总管连接在中冷器的出口和进气歧管的入口之间,进气歧管的出口和排气歧管的入口都连接在发动机上,高压级排气管连接在排气歧管的出口和高压级涡轮的入口之间,中压级排气管连接在高压级涡轮的出口和低压级涡轮的入口之间,低压级排气管的一端和低压级涡轮的出口相连接,另一端通大气。高压级压气机通过高压级连接轴和高压级涡轮轴连接,低压级压气机通过低压级连接轴和低压级涡轮轴连接,旁通管安装在高压级排气管和中压级排气管之间,旁通阀安装在旁通管内,高压级EGR管安装在高压级排气管和高压级进气管之间,中压级EGR管安装在中压级排气管和中压级进气管之间,低压级EGR管安装在低压级排气管和低压级进气管之间,高压级EGR控制阀、中压级EGR控制阀、低压级EGR控制阀分别安装于高压级EGR管、中压级EGR管、低压级EGR管内。高压级EGR冷却器安装于高压级EGR管上并置于高压级EGR控制阀和高压级排气管之间,中压级EGR冷却器安装于中压级EGR管上并置于中压级EGR控制阀和中压级排气管之间,低压级EGR冷却器安装于低压级EGR管上并置于低压级EGR控制阀和低压级排气管之间。In order to achieve the above object, the technical scheme adopted by the utility model is: the device includes a low-pressure stage air intake pipe, a low-pressure stage air compressor, a medium-pressure air intake pipe, a high-pressure air compressor, a high-pressure air intake pipe, an intercooler, and an air intake manifold , intake manifold, engine, exhaust manifold, high-pressure stage exhaust pipe, high-pressure stage turbine, medium-pressure stage exhaust pipe, low-pressure stage turbine, low-pressure stage exhaust pipe, bypass pipe, bypass valve, high-pressure stage Connecting shaft, low-pressure stage connecting shaft, high-pressure stage EGR pipe, medium-pressure stage EGR pipe, low-pressure stage EGR pipe, high-pressure stage EGR control valve, medium-pressure stage EGR control valve, low-pressure stage EGR control valve, high-pressure stage EGR cooler, medium The pressure-stage EGR cooler and the low-pressure stage EGR cooler, one end of the low-pressure stage intake pipe is connected to the inlet of the low-pressure stage compressor, and the other end is connected to the atmosphere. The medium-pressure inlet pipe is connected between the outlet of the low-pressure compressor and the inlet of the high-pressure compressor; the high-pressure inlet pipe is connected between the outlet of the high-pressure compressor and the inlet of the intercooler; Between the outlet of the cooler and the inlet of the intake manifold, the outlet of the intake manifold and the inlet of the exhaust manifold are connected to the engine, and the high-pressure stage exhaust pipe is connected to the outlet of the exhaust manifold and the high-pressure stage turbine Between the inlets of the middle-pressure stage exhaust pipe is connected between the outlet of the high-pressure stage turbine and the inlet of the low-pressure stage turbine, one end of the low-pressure stage exhaust pipe is connected with the outlet of the low-pressure stage turbine, and the other end is open to the atmosphere. The high-pressure stage compressor is connected to the high-pressure stage turbine shaft through the high-pressure stage connecting shaft, and the low-pressure stage compressor is connected to the low-pressure stage turbine shaft through the low-pressure stage connecting shaft. The bypass pipe is installed between the high-pressure stage exhaust pipe and the medium-pressure stage exhaust pipe. The bypass valve is installed in the bypass pipe, the high-pressure EGR pipe is installed between the high-pressure exhaust pipe and the high-pressure intake pipe, and the medium-pressure EGR pipe is installed between the medium-pressure exhaust pipe and the medium-pressure intake pipe. The low-pressure stage EGR pipe is installed between the low-pressure stage exhaust pipe and the low-pressure stage intake pipe, and the high-pressure stage EGR control valve, medium-pressure stage EGR control valve, and low-pressure stage EGR control valve are respectively installed in the high-pressure stage EGR EGR pipe, low-pressure stage EGR pipe. The high-pressure EGR cooler is installed on the high-pressure EGR pipe and placed between the high-pressure EGR control valve and the high-pressure exhaust pipe, and the medium-pressure EGR cooler is installed on the medium-pressure EGR pipe and placed between the medium-pressure EGR Between the control valve and the medium-pressure stage exhaust pipe, the low-pressure stage EGR cooler is installed on the low-pressure stage EGR pipe and placed between the low-pressure stage EGR control valve and the low-pressure stage exhaust pipe.
通过控制高、中、低压级EGR控制阀的关闭和开启,本装置实现了高、中、低压级EGR回路的单独以及组合工作模式。By controlling the closing and opening of the high, medium and low pressure EGR control valves, the device realizes the individual and combined working modes of the high, medium and low pressure EGR circuits.
本实用新型的有益效果:The beneficial effects of the utility model:
本实用新型设计合理,结构简单,使发动机在各个工况下都能获得所需的EGR流量并降低排气对压气机的损害。The utility model has a reasonable design and a simple structure, so that the engine can obtain the required EGR flow rate under various working conditions and reduce the damage of the exhaust gas to the compressor.
附图说明Description of drawings
图1是本实用新型废气再循环多回路装置的结构示意图。Fig. 1 is a structural schematic diagram of the utility model exhaust gas recirculation multi-circuit device.
具体实施方式Detailed ways
下面结合附图,对本实用新型的具体实施做进一步描述。Below in conjunction with accompanying drawing, the specific implementation of the present utility model is further described.
如图1所示,本实用新型包括低压级进气管4、低压级压气机5、中压级进气管9、高压级压气机10、高压级进气管14、中冷器15、进气总管16、进气歧管17、发动机18、排气歧管19、高压级排气管20、高压级涡轮21、中压级排气管24、低压级涡轮25、低压级排气管26、旁通管22、旁通阀23、高压级连接轴27、低压级连接轴28、高压级EGR管12、中压级EGR管7、低压级EGR管2、高压级EGR控制阀13、中压级EGR控制阀8、低压级EGR控制阀3,高压级EGR冷却器11、中压级EGR冷却器6和低压级EGR冷却器1。低压级进气管4的一端和低压级压气机5的入口相连接,另一端通大气,中压级进气管9连接在低压级压气机5的出口和高压级压气机10的入口之间,高压级进气管14连接在高压级压气机10的出口和中冷器14的入口之间,进气总管16连接在中冷器15的出口和进气歧管17的入口之间,进气歧管17的出口和排气歧管19的入口都连接在发动机18上,高压级排气管20连接在排气歧管19的出口和高压级涡轮21的入口之间,中压级排气管24连接在高压级涡轮21的出口和低压级涡轮25的入口之间,低压级排气管26的一端和低压级涡轮25的出口相连接,另一端通大气,高压级压气机10通过高压级连接轴27和高压级涡轮21轴连接,低压级压气机5通过低压级连接轴28和低压级涡轮25轴连接,旁通管22安装在高压级排气管20和中压级排气管24之间,旁通阀23安装在旁通管22内,高压级EGR管12安装在高压级排气管20和高压级进气管14之间,中压级EGR管7安装在中压级排气管24和中压级进气管9之间,低压级EGR管2安装在低压级排气管26和低压级进气管4之间,高压级EGR控制阀13、中压级EGR控制阀8、低压级EGR控制阀3分别安装于高压级EGR管12、中压级EGR管7、低压级EGR管2内,高压级EGR冷却器11安装于高压级EGR管12上并置于高压级EGR控制阀13和高压级排气管20之间,中压级EGR冷却器6安装于中压级EGR管7上并置于中压级EGR控制阀8和中压级排气管24之间,低压级EGR冷却器1安装于低压级EGR管2上并置于低压级EGR控制阀3和低压级排气管26之间。高压级EGR管12、高压级EGR冷却器11和高压级EGR控制阀13构成高压级EGR回路,中压级EGR管7、中压级EGR冷却器6和中压级EGR控制阀8构成中压级EGR回路,低压级EGR管2、低压级EGR冷却器1和低压级EGR控制阀3构成低压级EGR回路。当发动机处于低转速低工况,高压级排气管20内压力大于高压级进气管14内压力时,打开高压级EGR控制阀13,关闭中压级EGR控制阀8和低压级EGR控制阀3,高压级EGR回路工作,进气与一部分排气在高压级进气管14内混合经过中冷器15后由进气总管16流入发动机18。其它工况下,要根据各EGR回路两端压差情况尽可能的利用较高压级的EGR回路,在较高压级的EGR回路无法实现EGR流时,关闭相应的EGR控制阀并采用低一级的EGR回路,如有必要还可以实用任意的EGR回路组合来实现更大的EGR流量,使发动机在各个工况下都能获得所需的EGR流量并降低排气对压气机的损害。As shown in Figure 1, the utility model includes a low-pressure stage intake pipe 4, a low-
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101956633A (en) * | 2010-10-27 | 2011-01-26 | 湖南大学 | Exhaust gas recirculation system for internal combustion engine |
CN102889147A (en) * | 2012-09-26 | 2013-01-23 | 天津大学 | High-efficiency and low-emission novel composite thermodynamic cycle control method for engine |
CN103061909A (en) * | 2013-01-07 | 2013-04-24 | 天津大学 | Method for improving low-temperature combustion soot emission and fuel economy of diesel engine |
JP2016003614A (en) * | 2014-06-17 | 2016-01-12 | いすゞ自動車株式会社 | Engine exhaust gas recirculation method and engine exhaust gas recirculation device |
CN105392974A (en) * | 2013-06-11 | 2016-03-09 | 洋马株式会社 | Engine |
CN110145418A (en) * | 2019-05-05 | 2019-08-20 | 天津大学 | A medium-pressure exhaust gas recirculation system based on a two-stage turbocharger |
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2009
- 2009-10-14 CN CN200920312473XU patent/CN201513259U/en not_active Expired - Fee Related
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101956633A (en) * | 2010-10-27 | 2011-01-26 | 湖南大学 | Exhaust gas recirculation system for internal combustion engine |
CN102889147A (en) * | 2012-09-26 | 2013-01-23 | 天津大学 | High-efficiency and low-emission novel composite thermodynamic cycle control method for engine |
CN102889147B (en) * | 2012-09-26 | 2015-01-21 | 天津大学 | High-efficiency and low-emission novel composite thermodynamic cycle control method for engine |
CN103061909A (en) * | 2013-01-07 | 2013-04-24 | 天津大学 | Method for improving low-temperature combustion soot emission and fuel economy of diesel engine |
CN105392974A (en) * | 2013-06-11 | 2016-03-09 | 洋马株式会社 | Engine |
JP2016003614A (en) * | 2014-06-17 | 2016-01-12 | いすゞ自動車株式会社 | Engine exhaust gas recirculation method and engine exhaust gas recirculation device |
CN110145418A (en) * | 2019-05-05 | 2019-08-20 | 天津大学 | A medium-pressure exhaust gas recirculation system based on a two-stage turbocharger |
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