WO2012155291A1 - 集成式scr计量喷射*** - Google Patents

集成式scr计量喷射*** Download PDF

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Publication number
WO2012155291A1
WO2012155291A1 PCT/CN2011/000855 CN2011000855W WO2012155291A1 WO 2012155291 A1 WO2012155291 A1 WO 2012155291A1 CN 2011000855 W CN2011000855 W CN 2011000855W WO 2012155291 A1 WO2012155291 A1 WO 2012155291A1
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WO
WIPO (PCT)
Prior art keywords
metering
injection system
unit
water
metering injection
Prior art date
Application number
PCT/CN2011/000855
Other languages
English (en)
French (fr)
Inventor
郝庆军
Original Assignee
苏州派格力减排***有限公司
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 苏州派格力减排***有限公司 filed Critical 苏州派格力减排***有限公司
Priority to PCT/CN2011/000855 priority Critical patent/WO2012155291A1/zh
Priority to DE112011104704T priority patent/DE112011104704T5/de
Priority to CN201180045294.4A priority patent/CN103210191B/zh
Priority to US13/823,443 priority patent/US9279352B2/en
Publication of WO2012155291A1 publication Critical patent/WO2012155291A1/zh

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Classifications

    • 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
    • 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]
    • 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
    • F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
    • 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
    • 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
    • F01N2610/1406—Storage means for substances, e.g. tanks or reservoirs
    • 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
    • F01N2610/1486—Means to prevent the substance from freezing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2060/00—Cooling circuits using auxiliaries
    • F01P2060/16—Outlet manifold
    • 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

Definitions

  • the invention relates to a storage and injection control device for a reducing agent in a diesel vehicle exhaust gas purification system, in particular to an integrated SCR metering injection system.
  • SCR selective catalytic reduction
  • the SCR system generally includes a liquid storage tank, a metering injection unit, a nozzle, and the like.
  • each of the above modular units is independent of each other, and the heating of the reducing agent in the liquid storage tank and the metering injection unit is separately used.
  • the method of electric heating or other heating causes the connection of the pipeline and the joint in the system to be complicated and easy to leak, and the structure of the separate electric heating or other heating method is complicated, and the energy utilization rate is low. Summary of the invention
  • the object of the present invention is to overcome the deficiencies of the prior art and to provide an integrated SCR metering injection system with a high degree of integration, compact structure, easy ice formation, and high energy utilization.
  • an integrated SCR metering injection system comprising a metering injection unit and a water heating unit for heating the metering unit, the metering unit comprising A pump body, a diaphragm pump and a metering valve, the water heating unit comprising a plurality of water circulation pipes.
  • the water heating unit further includes an inlet pipe and an outlet pipe connected to the water circulation pipe.
  • the water heating unit further includes a water inlet joint and a water outlet joint, wherein the water inlet joint and the water outlet joint are disposed on the metering spray unit, and the water inlet joint, the water inlet pipe, the water outlet pipe, the water circulation pipe and the water outlet joint are connected through.
  • the integrated SCR metering injection system further includes a transition plate disposed between the metering injection unit and the water heating unit, the inlet pipe and the outlet pipe being connected to the water circulation pipe in the metering injection unit through the transition plate .
  • the metering and spraying unit further includes a cover body, the cover body is fastened to the pump body, and a closed space is formed between the cover body and the pump body, and at least the diaphragm pump is disposed in the closed space.
  • the water circulation pipe includes a first flow path and a second flow path disposed in the pump body, and a third flow path disposed on the lower surface of the pump body and the first flow path and the second flow path are connected.
  • the inlet pipe is further provided with a heat insulation sleeve.
  • a heat exchanger is disposed at the junction between the inlet pipe and the outlet pipe.
  • the integrated SCR metering injection system also includes an inductive component including a level sensor and a first temperature sensor, the inductive component being integral with the metering ejecting unit.
  • the integrated SCR metering injection system also includes a second temperature sensor that provides temperature monitoring of the metering injection unit.
  • the integrated SCR metering injection system of the present invention has the following advantages:
  • Figure 1 is a perspective view of the integrated SCR metering injection system of the present invention
  • Figure 2 is a perspective exploded view of Figure 1;
  • Figure 3 is a perspective view of the integrated SCR metering injection system of the present invention installed on a liquid storage tank;
  • Figure 4 is the wiring of the integrated SCR metering injection system of the present invention connected to the liquid storage tank
  • Figure 5 is a bottom plan view of the pump body in the integrated SCR metering injection system of the present invention.
  • Figure 6 is a plan view of the pump body in the integrated SCR metering injection system of the present invention.
  • Figure 7 is a perspective view of the transition plate of the present invention.
  • the integrated SCR metering injection system of the present invention comprises a metering spray unit 1 and a water heating unit 8, and the metering spray unit 1 can be fixedly mounted on a liquid storage tank 2, which comprises a cover body.
  • Pump body 12 diaphragm pump 13, filter 4, metering valve 5, mixing chamber 6, first A pressure sensor 14, a second pressure sensor 15, a liquid flow conduit 16 disposed on the pump body, a control unit 17, and a transition plate 3 disposed below the metering spray unit 1.
  • the transition plate 3 is disposed under the pump body 12, and a space between the lower surface of the pump body and a water circulation pipe 85 of the water heating unit 8 is disposed in a space formed between the lower surface of the pump body, and the transition plate 3 is provided.
  • a pipette 31 is formed which is formed to draw a reducing agent from the reservoir 2, and a bottom of the pipette 31 is connected to a coarse filter device 32 to prevent impurities in the reducing agent from entering the injection system to cause clogging.
  • the cover 11 is fastened to the pump body 12, and forms a closed space with the pump body 12.
  • the pressure sensor 15 is disposed in the closed space formed by the cover body 11 and the pump body 12.
  • the filter 4 is placed on the pump body 12 outside the cover body 11 for cleaning and maintenance; the diaphragm pump 13 is used to draw the reducing agent from the reservoir 2 into the liquid flow conduit 16 of the pump body to provide a power source for the delivery of the reducing agent.
  • the water heating unit 8 in the integrated SCR metering injection system of the present invention uses a heated engine cooling water cycle, and can measure the injection unit 1 and store in a cold season.
  • the reducing agent in the liquid tank 2 is heated, and at the same time, the heated engine cooling water heats the pump body 12 by circulating in the water circulation pipe.
  • the water heating unit 8 includes a water inlet joint 81, an inlet pipe 82, an outlet pipe 83, a water outlet joint 84, and a plurality of water circulation pipes 85 including a first flow passage 851 and a second disposed in the pump body 12. a flow passage 852, and a third flow passage 853 formed between the lower surface 121 of the pump body 12 and the transition plate 3, the first flow passage 851 and the second flow passage 852 respectively and the water inlet joint 81 disposed on the side wall of the pump body and The outlet joint 84 is connected.
  • the inlet pipe 82 and the outlet pipe 83 are formed to extend downward from the lower side of the transition plate 3, and the upper ends thereof are respectively communicated with the third flow 853 of the water circulation pipe 85, and the bottom portions are connected by a heat exchanger 87, the water inlet The joint 81, the inlet pipe 82, the outlet pipe 83, and the outlet joint 84 are sequentially communicated through the water circulation pipe 85 to form a good heating of the reducing agent in the pump body 12 and the reservoir 2.
  • the heat exchanger 87 formed at the junction of the inlet pipe 82 and the outlet pipe 83 is a spiral structure for increasing the heating area, and the heat insulating sleeve 88 is wrapped on the outer surface of the upper portion of the inlet pipe 82, the heat insulating sleeve
  • the setting of 87 prevents the heated cooling water from escaping excessive heat when flowing through the upper part of the inlet pipe, but first melts the freezing of the bottom of the urea tank to facilitate suction.
  • the metered injection device of the present invention further includes a vent tube 79, and the vent tube 79, the pipette 31, and the inlet pipe 82 are both enclosed within the insulating jacket 88.
  • a first electromagnetic valve 73 is further disposed on the pipeline of the water inlet pipe 82 in the water heating unit 8, the first electromagnetic valve 73 is electrically connected to the control unit 17, and the control unit 17 controls the first electromagnetic wide 73 to control the heated cooling water to circulate and heat the ice.
  • the control unit 17 is electrically connected to the diaphragm pump 13, the metering valve 5, and the first pressure sensor 14 and the second pressure sensor 15 installed at both ends of the metering valve 5 and the mixing chamber 6, wherein the first pressure sensor 14 is disposed At the upstream end of the metering valve 5, a second pressure sensor 15 is disposed at a downstream end of the metering valve 5, and the first pressure sensor 14 and the second pressure sensor 15 receive a commanded injection amount and a metering valve according to the control unit. The pressure difference at the end, and calculate the duty cycle of the opening pulse of the metering valve 5, to achieve the purpose of accurate metering.
  • the metering injection device in this embodiment further includes a compressed air unit 9, which includes a gas source 91, a second solenoid valve 92, and a pressure reducing valve 93, which are sequentially connected in series, and the second solenoid valve 92 circuit Connected to the control unit 17, the air source 91 is further provided with an air filter downstream, and the compressed air unit can provide air pressure for opening or closing the diaphragm valve 71, and can provide compression for atomization of the reducing agent in the mixing chamber 6. air.
  • a compressed air unit 9 which includes a gas source 91, a second solenoid valve 92, and a pressure reducing valve 93, which are sequentially connected in series, and the second solenoid valve 92 circuit Connected to the control unit 17, the air source 91 is further provided with an air filter downstream, and the compressed air unit can provide air pressure for opening or closing the diaphragm valve 71, and can provide compression for atomization of the reducing agent in the mixing chamber 6. air.
  • the metering injection device of the present invention further includes an inductive component 19, the inductive component 19 is composed of a displacement sensor and a first temperature sensor, and the inductive component is integrated with the water heating unit.
  • the sensing assembly is electrically coupled to a control unit within the metering spray unit, the sensing assembly providing sensing information of the liquid level and temperature within the reservoir.
  • the control unit 17 controls the motor in the diaphragm pump 13 to start the emptying operation at a certain fixed rotation speed, so that the reducing agent in the liquid flow conduit 16 returns to the storage tank 2 through the return line. After about 30 seconds, the control unit 17 controls the second solenoid valve 72 to open the air source to close the emptying circuit. At this time, the diaphragm pump 13 continues to operate, and the reducing agent is sent by the pump body through the liquid flow pipe 16 and the filter 4. Up to the upstream of the metering width 5, the pressure continues to increase.
  • the control unit receives the injection request, and controls the metering.
  • the valve 5 starts metering injection, and the second pressure sensor 15 is used to collect the pressure value P2 downstream of the metering valve to calculate the pressure difference and adjust the metering valve to open the pulse width.
  • the control unit 17 controls the compressed air unit to close the liquid returning diaphragm, before the injection, the pressure value (P1) of the first pressure sensor 14 is small, at which time the control unit 17 controls the motor in the diaphragm pump to be preset.
  • the pressure P1 in the filter chamber reaches the injection pressure value; after starting the injection, P1 will fall, and the falling speed is related to the injection amount.
  • the motor starts to work, and the filter chamber is supplemented with reducing agent to maintain P1. The value is stable. In this process, the motor speed is closed-loop controlled according to the injection quantity and the current P1 value to achieve accurate metering.
  • the control unit 17 When the temperature is lower and heating is required, when the control unit 17 receives the low temperature signal of the temperature sensor in the inductive sensor, the control unit controls the second solenoid valve 92 to open the water heating unit, and the heated engine cooling water sequentially flows through the water inlet joint 81.
  • the water inlet pipe 82, the water outlet pipe 83 and the water outlet joint 84 both realize the heating of the metering spray unit and the heating of the reducing agent in the liquid storage tank 2.
  • system control methods may be employed, such as an airless injection system or an air injection system having a secondary atomization effect, the nozzle tube downstream of the metering injection unit of the gas injection system.
  • the road is connected to the air compression unit.

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

Abstract

一种集成式SCR计量喷射***包括计量喷射单元（1）和水加热单元（8），其中水加热单元（8）对计量喷射单元（1）进行加热。计量喷射单元（1）包括泵体（12），膜片泵（13）和计量阀（5）。水加热单元（8）包括相互连通的进水接头（81），进水管（82），出水管（83）和复数段水循环管道（85）。水加热单元（8）采用加热后的发动机冷却水对计量喷射单元（1）进行加热，提高了能量的循环利用率。

Description

集成式 SCR计量喷射***
技术领域
本发明涉及一种柴油车尾气处理净化***中还原剂的存储及喷射控制 装置， 尤其涉及一种集成式 SCR计量喷射***。 背景技术
随着社会对环境保护要求的越来越高， 国家对环境保护的力度越来越 大， 就机动车排放方面国家相关部门已出台相关政策， 尤其是 "国 IV标准" 的推行， 对机动车排放控制更趋严格， 需要在满足"国 III标准"基础上再进 一步降低 30%〜50%的污染物才能达标， 按标准正常实施进程， 全国范围 将于 2012年实施 "国 W标准"。
现已知， 选择性催化还原技术 （SCR) 是机动车尾气后处理技术的主 流路线， 即将还原剂经过雾化定量喷射进排气管路， 并通过 SCR催化剂将 废气中的主要有害气体 NOX转化成氮气和水排出， 达到尾气净化的目的， 这也是实现 "国 IV标准"最普遍的技术路线。
SCR***一般包括储液箱、计量喷射单元、 喷嘴等装置， 然而现有技术中， 上述各模块单元都是相互独立的， 且对储液箱及计量喷射单元中的还原剂 的加热采用单独的电加热或其他加热的方式， 因此， 造成***中管路及接 头连接复杂， 容易泄露， 单独的电加热或其他加热方式的结构复杂， 能源 利用率低。 发明内容
本发明的目的在于克服现有技术的缺陷， 提出一种集成化程度高、 结 构紧凑、 易于化冰， 且能量利用率高的集成式 SCR计量喷射***。
为实现上述目的， 本发明提出如下技术方案： 集成式 SCR计量喷射系 统， 所述集成式 SCR计量喷射***包括计量喷射单元和对该计量喷射单元 进行加热的水加热单元， 所述计量喷射单元包括泵体， 膜片泵和计量阀， 所述水加热单元包括复数段水循环管道。 优选地， 所述水加热单元的还包括和所述水循环管道相接的进水管和 出水管。
所述水加热单元还包括进水接头和出水接头， 所述进水接头和出水接 头设置在所述计量喷射单元上， 所述进水接头、 进水管、 出水管、 水循环 管道和出水接头相接通。
所述集成式 SCR计量喷射***还包括一设置于所述计量喷射单元和水 加热单元之间的过渡板， 所述进水管和出水管通过过渡板与所述计量喷射 单元内的水循环管道接通。
所述计量喷射单元还包括盖体， 所述盖体扣合于所述泵体上， 所述盖 体和泵体间形成封闭空间， 至少所述膜片泵设置于所述封闭空间内。
所述水循环管道包括设置在泵体内第一流道和第二流道， 设置在泵体 下表面和所述第一流道和第二流道相接通的第三流道。
所述进水管上还设置有隔热套。
所述进水管和出水管间的连接处设置有热交换器。
所述集成式 SCR计量喷射***还包括感应组件， 所述感应组件包括液 位传感器和第一温度传感器，所述感应组件与所述计量喷射单元集成一体。
所述集成式 SCR计量喷射***还包括对所述计量喷射单元进行温度监 控的第二温度传感器。
与现有技术相比， 本发明集成式 SCR计量喷射***具有如下优点：
1 ) 设计方案优良、 集成度高；
2 ) 加热后的发动机冷却水直接经过计量喷射单元， 节省了对计量泵单独 进行加热的水加热装置或电加热装置， 提高了能量的循环利用率；
3 ) 通过在进液管上部包裹隔热套及热交换器使底部还原剂先加热， 加热 效果好， 便于还原剂及时化冰抽吸。 附图说明
图 1是本发明集成式 SCR计量喷射***的立体视图；
图 2是图 1的立体分解视图；
图 3是图 2本发明集成式 SCR计量喷射***装设于储液箱上的立体视 图； 图 4是本发明集成式 SCR计量喷射***连接储液箱的接线
图 5是本发明集成式 SCR计量喷射***中泵体的仰视图；
图 6是本发明集成式 SCR计量喷射***中泵体的俯视图；
图 7是本发明中过渡板的立体视图。 图中元件的标号 计量喷射单元 1 储液箱 2 过渡板 3 盖体 11 泵体 12 膜片泵 13 第一压力传感器 14 第二压力传感器 15 液流管道 16 控制单元 17 感应组件 19 泵体下表面 121 吸液管 31 粗滤装置 32 过滤器 4 计量阀 5 混合腔 6 膜片阀 72 第一电磁阔 73
79 水加热单元 8 进水接头 81 进水管 82 出水管 83 出水接头 84 水循环管道 85 第 ■流道 851 第二流道 852 第三流道 853 热交换器 87 隔热套 88 压缩空气单元 9 气源 91 第二电磁阀 92 减压阔 93 第二温度传感器 94 具体实施方式
下面将结合本发明的附图， 对本发明优选实施例中的技术方案进行清 楚、 完整的描述。
如图 1、 图 2及图 3所示， 本发明集成式 SCR计量喷射***包括计量 喷射单元 1和水加热单元 8， 计量喷射单元 1可固定安装于一储液箱 2上， 其包括盖体 11、 泵体 12、 膜片泵 13、 过滤器 4、 计量阀 5、 混合腔 6、 第 一压力传感器 14、 第二压力传感器 15， 设置于泵体上液流管道 16， 控制 单元 17， 以及设置于计量喷射单元 1下方的过渡板 3。
所述过渡板 3装设于所述泵体 12的下方，其与泵体的下表面间形成的 空间内设置有部分液流管道 16和水加热单元 8的水循环管道 85， 所述过 渡板 3 向下延伸形成有从储液箱 2中吸取还原剂的吸液管 31， 吸液管 31 的底部连接一粗滤装置 32， 防止还原剂内杂质进入喷射***造成堵塞。
结合图 4示， 盖体 11扣合于泵体 12上， 其与泵体 12间形成一封闭空 间， 所述膜片泵 13、 计量阀 5、 混合腔 6、 第一压力传感器 14和第二压力 传感器 15均设置在所述盖体 11和泵体 12所形成的封闭空间内，所述过滤 器 4置于所述盖体 11外侧的泵体 12上， 便于清洁维护； 所述膜片泵 13用 于将还原剂从储液箱 2内抽吸到泵体的液流管道 16中，从而为还原剂的输 送提供动力源。
结合图 5、 图 6、 图 7及图 8示， 本发明集成式 SCR计量喷射***中 的水加热单元 8， 其采用加热后的发动机冷却水循环， 在寒冷的季节可以 对计量喷射单元 1和储液箱 2内的还原剂进行加热， 同时， 加热后的发动 机冷却水通过在水循环管道内循环流动对泵体 12进行加热。
所述水加热单元 8包括进水接头 81、 进水管 82、 出水管 83、 出水接 头 84和复数段水循环管道 85， 所述水循环管道 85包括设置在泵体 12内 的第一流道 851和第二流道 852， 以及形成于泵体 12下表面 121与过渡板 3间的第三流道 853，第一流道 851和第二流道 852分别与设置在泵体侧壁 上的进水接头 81和出水接头 84相接。
进水管 82和出水管 83 自过渡板 3的下侧向下延伸形成， 其上端分别 与水循环管道 85的第三流通 853相连通， 底部间通过一热交换器 87相接 通， 所述进水接头 81、 进水管 82、 出水管 83和出水接头 84通过水循环管 道 85依次连通， 以对泵体 12及储液箱 2内的还原剂形成良好的加热。
较佳地，在进水管 82和出水管 83连接处的形成的热交换器 87为增大 加热面积的螺旋状结构， 且在进水管 82上部的外表面上包裹隔热套 88， 隔热套 87 的设置使加热后的冷却水在流经进水管上部时避免损失过多热 量， 而是首先融化尿素箱底部的冰冻， 便于抽吸。 更佳地， 所述本发明计量喷射装置还包括通气管 79， 所述通气管 79、 吸液管 31和进水管 82均包裹在隔热套 88内。
参见图 4所示，水加热单元 8中进水管 82所在管路上还设置有第一电 磁阀 73， 所述第一电磁阀 73电连接所述控制单元 17， 控制单元 17通过控 制第一电磁阔 73来控制加热后的冷却水进行循环加热化冰。
所述控制单元 17电连接所述膜片泵 13、计量阀 5， 以及装设于计量阀 5和混合腔 6两端的第一压力传感器 14和第二压力传感器 15，其中第一压 力传感器 14设置在所述计量阀 5的上游端， 第二压力传感器 15设置在所 述计量阀 5的下游端， 第一压力传感器 14和第二压力传感器 15根据控制 单元接收到的命令喷射量和计量阀两端的压差， 并计算计量阀 5的开启脉 冲的占空比， 达到精确计量的目的。
本实施例中的计量喷射装置还包括压縮空气单元 9， 所述压縮空气单 元 9包括依次串联的气源 91、 第二电磁阀 92和减压阀 93， 所述第二电磁 阀 92电路连接控制单元 17， 所述气源 91的下游还设置有空气过滤器， 压 缩空气单元既可以为膜片阀 71打开或关闭提供空气压力，又可以为混合腔 6内还原剂的雾化提供压缩空气。
结合图 4及图 7所示， 本发明的计量喷射装置还包括感应组件 19， 所 述感应组件 19由位移传感器和第一温度传感器组成，所述述感应组件与所 述水加热单元集成在所述计量喷射单元的下方， 所述述感应组件与所述计 量喷射单元内的控制单元电连接， 所述感应组件提供储液箱内液位和温度 的感应信息。
当控制单元接受到发动机点火信号时， 控制单元 17控制膜片泵 13内 的电机以某一固定转速开始排空动作，使得液流管道 16中的还原剂通过回 流管路返回到储液箱 2中， 约 30秒后， 控制单元 17控制第二电磁阀 72开 启气源来关闭排空回路， 此时膜片泵 13继续工作， 还原剂经液流管道 16 和过滤器 4后被泵体送到计量阔 5的上游， 其压力持续增加， 当计量阀 5 上游的第一压力传感器 14的压力值 P1达到设定值时， 膜片泵电机停转， 控制单元接受到喷射请求， 并控制计量阀 5开始计量喷射， 第二压力传感 器 15用于采集计量阀下游的压力值 P2, 以计算压差， 并调整计量阀打开 脉宽。 在控制单元 17控制压縮空气单元关闭回液膜片后、 喷射前， 第一压力 传感器 14的压力值 (P1)较小，此时控制单元 17控制膜片泵内的电机以预先 设定的转速运行， 大约 5s后， 过滤腔内的压力 P1达到喷射压力值； 开始 喷射后 P1会下降， 下降速度与喷射量有关， 为了维持 P1稳定， 电机开始 工作， 过滤腔补充还原剂， 以维持 P1值的稳定， 此过程中， 电机转速根据 喷射量和当前 P1值进行闭环控制， 达到精确计量的目的。
当温度较低需要加热时，控制单元 17接受到感应传感器中温度传感器 的低温信号时， 控制单元会控制第二电磁阀 92打开水加热单元， 加热后的 发动机冷却水依次流经进水接头 81、进水管 82、出水管 83和出水接头 84， 既实现了计量喷射单元的加热， 也实现了储液箱 2内还原剂的加热。
在本发明的其他实施例中， 也可以采用其他的***控制方式， 如采用 无气喷射***或具有二次雾化效果的有气喷射***， 这种气喷射***的计 量喷射单元下游的喷嘴管路连通空气压縮单元。
本发明的技术内容及技术特征已揭示如上， 然而熟悉本领域的技术人 员仍可能基于本发明的教示及揭示而作种种不背离本发明精神的替换及修 饰， 因此， 本发明保护范围应不限于实施例所揭示的内容， 而应包括各种 不背离本发明的替换及修饰， 并为本专利申请权利要求所涵盖。

Claims

权 利 要 求 书
1. 集成式 SCR计量喷射***， 其特征在于： 所述集成式 SCR计量喷射系 统包括计量喷射单元和对该计量喷射单元进行加热的水加热单元，所述计量 喷射单元包括泵体，膜片泵和计量阀，所述水加热单元包括复数段水循环管 道。
2. 根据权利要求 1所述的集成式 SCR计量喷射***， 其特征在于： 所述 水加热单元的还包括和所述水循环管道相接的进水管和出水管。
3. 根据权利要求 2所述的集成式 SCR计量喷射***， 其特征在于： 所述 水加热单元还包括进水接头和出水接头，所述进水接头和出水接头设置在所 述计量喷射单元上， 所述进水接头、 进水管、 出水管、 水循环管道和出水接 头相接通。
4. 根据权利要求 3所述的集成式 SCR计量喷射***， 其特征在于： 所述 集成式 SCR计量喷射***还包括一设置于所述计量喷射单元和水加热单元 之间的过渡板，所述进水管和出水管通过过渡板与所述计量喷射单元内的水 循环管道接通。
5. 根据权利要求 1所述的集成式 SCR计量喷射***， 其特征在于： 所述计 量喷射单元还包括盖体， 所述盖体扣合于所述泵体上， 所述盖体和泵体间 形成封闭空间， 至少所述膜片泵设置于所述封闭空间内。
6. 根据权利要求 2、 3、 4任意一项所述的集成式 SCR计量喷射***， 其特 征在于： 所述水循环管道包括设置在泵体内第一流道和第二流道， 设置在 泵体下表面和所述第一流道和第二流道相接通的第三流道。
7. 根据权利要求 2、 3或 4任意一项所述的集成式 SCR计量喷射***， 其 特征在于： 所述进水管上还设置有隔热套。
8. 根据权利要求 2、 3或 4任意一项所述的集成式 SCR计量喷射***， 其 特征在于： 所述进水管和出水管间的连接处设置有热交换器。
9. 根据权利要求 1-5任意一项所述的集成式 SCR计量喷射***， 其特征在 于： 所述集成式 SCR计量喷射***还包括感应组件， 所述感应组件包括液 位传感器和第一温度传感器， 所述感应组件与所述计量喷射单元集成一体。
10. 根据权利要求 1-5中任意一项所述的集成式 SCR计量喷射***， 其特 征在于： 所述集成式 SCR计量喷射***还包括对所述计量喷射单元进行温 度监控的第二温度传感器。
PCT/CN2011/000855 2011-05-16 2011-05-16 集成式scr计量喷射*** WO2012155291A1 (zh)

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