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CN108625958A - 一种无空气辅助的尿素泵 - Google Patents

一种无空气辅助的尿素泵 Download PDF

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Publication number
CN108625958A
CN108625958A CN201810860677.0A CN201810860677A CN108625958A CN 108625958 A CN108625958 A CN 108625958A CN 201810860677 A CN201810860677 A CN 201810860677A CN 108625958 A CN108625958 A CN 108625958A
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pump
urea
accumulation chamber
pressure accumulation
inlet
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臧志成
陈兴通
刘德文
赵闯
曾伟
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Kailong High Technology Co Ltd
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Kailong High Technology Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • 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
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • 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
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/28—Safety arrangements; Monitoring
    • 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
    • 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
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/14—Rotary-piston machines or pumps 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
    • F04C2/18—Rotary-piston machines or pumps 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 similar tooth forms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1433—Pumps
    • F01N2610/144—Control thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • F01N2610/146—Control thereof, e.g. control of injectors or injection valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/148—Arrangement of sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
    • F01N2900/1404—Exhaust gas temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
    • F01N2900/1806—Properties of reducing agent or dosing system
    • F01N2900/1808—Pressure
    • 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
    • F04C2210/00—Fluid
    • F04C2210/10—Fluid working
    • F04C2210/1083—Urea
    • 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
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

本发明公开了一种无空气辅助的尿素泵，其包括泵体，所述泵体内设置有齿轮泵和蓄压腔，所述齿轮泵通过内部通道与蓄压腔相连通，所述齿轮泵上设置有第一进液口、出液口和溢流口，所述溢流口内设有一个溢流阀，所述蓄压腔上设置有第二进液口、喷射口和回液口，所述第一进液口通过管路与尿素罐相连通，所述出液口通过管路与第二进液口相连通，所述溢流口通过管路与回液口相连通，所述回液口与尿素罐相连通，所述喷射口通过喷射管路连接有喷嘴，所述蓄压腔上安装有压力传感器，电子控制单元均与齿轮泵和压力传感器通信连接。上述无空气辅助的尿素泵不仅结构简单，紧凑，重量轻，体积小；而且成本低，运行稳定可靠，喷射控制精度高。

Description

一种无空气辅助的尿素泵
技术领域
本发明涉及柴油机尾气后处理中的SCR喷射系统，尤其是涉及一种用于柴油机尾气后处理中的SCR喷射系统的无空气辅助的尿素泵。
背景技术
用于柴油机选择性催化转化系统SCR(SelectiveCatalystReduction)是指安装在柴油汽车排气系统中，将柴油机排放中的NOx催化还原成N2和O2的催化还原装置，选择尿素水溶液作为还原剂。尿素水溶液喷射到催化剂上游的排气管中，在废气温度和气流的作用下水解产生为CO2和氨气，氨气作为还原剂将NOx还原成无污染的氮气和水。
尿素泵是SCR系统中必不可少的重要部件，然而，现有的大部分尿素泵普遍存在结构复杂、可靠性差和成本高的缺点。
发明内容
本发明的目的在于提供一种无空气辅助的尿素泵，以解决现有技术尿素泵存在结构复杂、可靠性差和成本高的问题。
为达此目的，本发明采用以下技术方案：
一种无空气辅助的尿素泵，其包括泵体，所述泵体内设置有齿轮泵和蓄压腔，所述齿轮泵通过内部通道与蓄压腔相连通，其中，所述齿轮泵上设置有第一进液口、出液口和溢流口，所述溢流口内设有一个溢流阀，所述蓄压腔上设置有第二进液口、喷射口和回液口，所述第一进液口通过管路与尿素罐相连通，所述出液口通过管路与第二进液口相连通，所述溢流口通过管路与回液口相连通，所述回液口与尿素罐相连通，所述喷射口通过喷射管路连接有喷嘴，所述蓄压腔上安装有压力传感器，电子控制单元均与齿轮泵和压力传感器通信连接。
特别地，所述蓄压腔上还安装有温度传感器。
特别地，所述温度传感器和压力传感器均通过螺纹结构与蓄压腔连接。
特别地，所述喷射口通过喷射管路连接有喷嘴，所述电子控制单元与喷嘴通信连接，以控制喷嘴的开启时间。
特别地，所述电子控制单元控制齿轮泵以设定速度正转或反转，以实现尿素溶液的供给和回抽。
本发明的有益效果为，与现有技术相比所述无空气辅助的尿素泵不仅结构简单，紧凑，重量轻，体积小；而且成本低，运行稳定可靠，喷射控制精度高。
附图说明
图1是本发明具体实施方式提供的无空气辅助的尿素泵的立体结构示意图；
图2是本发明具体实施方式提供的无空气辅助的尿素泵的齿轮泵的端盖的立体结构示意图；
图3是本发明具体实施方式提供的无空气辅助的尿素泵的正常工作时的液路原理图；
图4是本发明具体实施方式提供的无空气辅助的尿素泵的回抽尿素溶液时的液路原理图。
具体实施方式
下面结合附图并通过具体实施方式来进一步说明本发明的技术方案。
请参阅图1至图4所示，本实施例中，一种无空气辅助的尿素泵包括泵体1，所述泵体1内设置有齿轮泵2和蓄压腔3，所述齿轮泵2通过内部通道与蓄压腔3相连通，所述齿轮泵2上设置有第一进液口20、出液口21和溢流口22，所述溢流口22内设有一个溢流阀23，蓄压腔3上设置有第二进液口30、喷射口31和回液口32，所述第一进液口20通过管路与尿素罐7相连通，所述出液口21通过管路与第二进液口30相连通，溢流口22通过管路与回液口32相连通，回液口32与尿素罐7相连通，喷射口31通过喷射管路连接有电控喷嘴8，温度传感器4和压力传感器5均通过螺纹结构连接于蓄压腔3上。
电子控制单元6分别与齿轮泵2、压力传感器5、温度传感器4和喷嘴通信连接，电子控制单元6能够控制齿轮泵2以设定转速正反运转，电子控制单元6通过压力传感器5可以实时监测喷射管路内的尿素压力，电子控制单元6根据内部程序控制电控喷嘴8的开启时间，从而控制尿素的喷射精度。
当柴油机启动后，排气温度达到标定值，电子控制单元6控制齿轮泵2以一定转速正向运转，从尿素罐7中抽取尿素溶液，尿素充满与泵体喷射口连接的尿素喷射管路和电控喷嘴8，并且在其内建立一定压力，多余的尿素通过齿轮泵2的溢流口22内设的溢流阀23经过蓄压腔3的回液口32回流至尿素罐7，此时电子控制单元6通过压力传感器5可以实时监测喷射管路内的尿素压力。电子控制单元6根据内部程序控制电控喷嘴8的开启时间，从而控制尿素的喷射精度。当柴油机下电后，电子控制单元6控制齿轮泵2反向运转，将尿素管路和电控喷嘴内的尿素抽回尿素罐7中，防止尿素结晶。
以上实施例只是阐述了本发明的基本原理和特性，本发明不受上述事例限制，在不脱离本发明精神和范围的前提下，本发明还有各种变化和改变，这些变化和改变都落入要求保护的本发明范围内。本发明要求保护范围由所附的权利要求书及其等效物界定。

Claims (5)

1.一种无空气辅助的尿素泵，其包括泵体，所述泵体内设置有齿轮泵和蓄压腔，所述齿轮泵通过内部通道与蓄压腔相连通，其特征在于，所述齿轮泵上设置有第一进液口、出液口和溢流口，所述溢流口内设有一个溢流阀，所述蓄压腔上设置有第二进液口、喷射口和回液口，所述第一进液口通过管路与尿素罐相连通，所述出液口通过管路与第二进液口相连通，所述溢流口通过管路与回液口相连通，所述回液口与尿素罐相连通，所述喷射口通过喷射管路连接有喷嘴，所述蓄压腔上安装有压力传感器，电子控制单元均与齿轮泵和压力传感器通信连接。
2.根据权利要求1所述的无空气辅助的尿素泵，其特征在于，所述蓄压腔上还安装有温度传感器。
3.根据权利要求2所述的无空气辅助的尿素泵，其特征在于，所述温度传感器和压力传感器均通过螺纹结构与蓄压腔连接。
4.根据权利要求1所述的无空气辅助的尿素泵，其特征在于，所述喷射口通过喷射管路连接有喷嘴，所述电子控制单元与喷嘴通信连接。
5.根据权利要求1所述的无空气辅助的尿素泵，其特征在于，所述电子控制单元控制齿轮泵以设定速度正转或反转。
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109975495A (zh) * 2019-04-30 2019-07-05 凯龙高科技股份有限公司 一种集成式尿素液位温度品质传感器
CN112855312A (zh) * 2021-03-04 2021-05-28 山东艾泰克环保科技股份有限公司 一种尿素泵喷射计量泵
CN113145407A (zh) * 2020-11-20 2021-07-23 河北华胜科技有限公司 一种稳流输送系统

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