CN106285853B - 一种集成液位传感器的高压车用尿素液供给模块 - Google Patents

一种集成液位传感器的高压车用尿素液供给模块 Download PDF

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CN106285853B
CN106285853B CN201610929811.9A CN201610929811A CN106285853B CN 106285853 B CN106285853 B CN 106285853B CN 201610929811 A CN201610929811 A CN 201610929811A CN 106285853 B CN106285853 B CN 106285853B
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贾昭远
邢喜春
戈非
朱宏志
尹燕升
李冠霖
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    • 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
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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    • 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
    • F01N2610/1426—Filtration means
    • 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
    • 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
    • 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
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Abstract

本发明公开了一种集成液位传感器的高压车用尿素液供给模块，属于汽车尾气后处理领域。针对目前尿素供给模块结构不合理，在有气压拆卸时容易伤害到拆卸者、外置滤清器管路复杂的问题，本发明的车用尿素供给模块集成尿素液换热水管、进气接口、排气接口、供液管、滤清器，集成尿素液位和尿素温度传感信号，可耐整车底盘压缩气体气压。尿素液供液管进液端集成安装高精度可更换尿素液滤清器。供液管入口设置阻尼孔，防止尿素高速射流，具有很高安全性。

Description

一种集成液位传感器的高压车用尿素液供给模块
技术领域
本发明属于汽车尾气后处理领域。
背景技术
随着商用车国Ⅳ排放法规的实施，整车必须加装氮氧化物(NOx)排放后处理装置。
中国中重型柴油机普遍采用选择性催化转化(SCR)技术路线，即将标准车用尿素水溶液喷射到排气中，使用其分解产生的氨气(NH3)对NOx进行选择性催化还原，生成无害的氮气(N2)和水(H2O)。
气驱尿素喷射系统是一种尿素罐蓄气压提供喷射压力的系统。
尿素供给模块安装在气驱系统尿素罐上，提供尿素液位、温度信号，并集成气路、液路接口，需要有良好的气密性。在尿素罐内有气压时拆卸时，不合理的固定结构很可能伤害到拆卸者。
系统需要尿素滤清器对尿素液进行过滤，但外置滤清器管路复杂。同时尿素液冬季结冰，需要加热解冻，导致管路及滤清器成本昂贵。
产品在使用过程中，若尿素管路突然被破坏，由于尿素罐内有较高气压，会造成尿素液高速喷出，导致尿素快速流失甚至造成人身伤害。
发明内容
针对上述问题，本发明提供了一种集成液位传感器的高压车用尿素液供给模块，包括进水口1、电气接口2、出水口3、进气口4，尿素出液口5，排气口6，换热水管7，液位及温度传感器8，尿素供液管9，滤清器夹箍10，滤清器11，法兰盘12，密封圈13，阻尼孔14。
进水口1、电气接口2、出水口3、进气口4、尿素出液口5和排气口6均设置于法兰盘12上；法兰盘12可封住尿素罐罐口，并通过密封圈13实现轴向密封；
其中，尿素出液口5与尿素供液管9相连，尿素供液管9另一端与设置尿素罐底部位置的滤清器11通过滤清器夹箍10固定连接；滤清器11周围环绕换热水管7，换热水管7的两端分别与进水口1和出水口3相连，尿素供液管9与滤清器11连接的管口处为阻尼孔14；液位及温度传感器8位于尿素罐内，其通过电气接口2输出尿素液位和温度信号。
优选地，尿素供液管9有至少一个折弯，以降低从断裂口流出的尿素流速和流量，这样就既不会导致尿素迅速流失更不会造成人员伤害。
为了避免阻尼孔17孔径过小，导致阻力过大、尿素喷嘴端尿素压力降过大，进而使尿素喷射量不准确的问题，阻尼孔14的孔径d存在关系式，
25Q2/(32π2P)≤d4≤D4/4P2
式中，P为尿素喷射压力，Q为尿素喷嘴流量，D为尿素出液口5孔径。
本发明的有益效果：
1、尿素罐采用轴向密封，采用多螺栓固定，拆卸掉相邻两个螺栓后密封失效自动放气，无伤人风险。
2、尿素供液管进液端集成安装高精度可更换滤清器，无需使用外置滤清器。
3、供液管进液端设置阻尼孔，防止尿素高速射流，具有较高安全性。
4、通过换热水管的设置解决了尿素液冬季结冰的问题。
附图说明
图1是本发明的尿素供给模块示意图。
具体实施方式
实施例1
如图1所示，本实施例中的尿素供给模块，包括进水口1、电气接口2、出水口3、进气口4、尿素出液口5、排气口6、冷却水管7、液位及温度传感器8、尿素供液管9、滤清器夹箍10、滤清器11、法兰盘12，O型密封圈13，阻尼孔14。进水口1、电气接口2、出水口3、进气口4、尿素出液口5和排气口6均设置于法兰盘12上；法兰盘12可封住尿素罐罐口，并通过密封圈13实现轴向密封；
其中，尿素出液口5与尿素供液管9相连，尿素供液管9另一端与设置尿素罐底部位置的滤清器11通过滤清器夹箍10固定连接；滤清器11周围环绕换热水管7，换热水管7的两端分别与进水口1和出水口3相连，尿素供液管9与滤清器11连接的管口处为阻尼孔14；液位及温度传感器8位于尿素罐内，液位及温度传感器8通过电气接口2向ECU输出尿素罐内的尿素液位和温度信号。
集成了滤清器11，无需使用外置滤清器；在供液管9进液口处加工有阻尼孔14，可以限制进入供液管9的尿素流量；尿素罐和安装法兰12之间通过O型密封圈13密封，可以满足密封性要求，带压拆卸无危险。
法兰盘12通过6个径向均布的螺栓固定在尿素罐上，尿素罐和法兰盘12之间通过O型密封圈13轴向密封，保证罐内气压稳定。带压拆卸模块时，拆卸掉相邻的2个螺栓后，密封结构就会失效泄压，不会对拆卸者造成伤害。
尿素出液口5和尿素供液管9焊接在安装法兰12上，滤清器11通过夹箍10安装在尿素供液管进液端。进行尿素供给时，尿素罐内尿素通过气压驱动由尿素滤清器11过滤后，经尿素供液管9下端的阻尼孔14进入管内，并通过尿素出液口5经尿素管路传输到尿素喷嘴。滤清器11可采用高精度可更换滤芯，采用正压滤清技术，从而具有较高的使用寿命。
当尿素罐建压时，气体通过进气口4进入尿素罐。尿素罐泄压时，气体通过排气口6排出。尿素罐内有气压时，如果连接尿素出液口5与尿素喷嘴的尿素管路泄漏，由于阻尼孔14限制了尿素流量，从断裂口流出的尿素流速和流量都很低，既不会导致尿素迅速流失更不会造成人员伤害。
进水口1，出水口3，换热水管7焊接在法兰盘12上构成换热水路，循环水用于对尿素罐内尿素解冻。当尿素溶液结冰时，冷却水通过进水口1，出水口2，换热水管7循环，加热尿素罐内尿素，冷却水管在滤清器11周围采取包围结构，保证滤清器11附近尿素率先解冻。
阻尼孔14为加工有一个小孔的部件，尿素罐内有气压时，如果连接尿素出液口5与尿素喷嘴的尿素管路泄漏，需要通过阻尼孔14限制尿素流量，同时尿素供液管9设计有至少一个折弯，以降低从断裂口流出的尿素流速和流量，这样就既不会导致尿素迅速流失更不会造成人员伤害。
因此阻尼孔14孔径d需要根据尿素出液口5孔径D和尿素喷射压力P进行优化，以保证出液口5处尿素压力小于一定压力，一般应小于0.5bar，优化算法如下：
d2＝D2/2P (1)
同时，也要避免阻尼孔17孔径过小，导致阻力过大、尿素喷嘴端尿素压力降过大，进而使尿素喷射量不准确。
因此阻尼孔14孔径d还需要根据尿素喷嘴流量Q进行优化设计，一般应保证，尿素喷嘴端压力降不大4％，优化算法如下：
d4＝25Q2/(32π2P) (2)
所以应保证阻尼孔17直径d存在关系式，
25Q2/(32π2P)≤d4≤D4/4P2 (3)。

Claims (1)

1.一种集成液位传感器的高压车用尿素液供给模块，其特征在于，其包括进水口（1）、电气接口（2）、出水口（3）、进气口（4）、尿素出液口（5）、排气口（6）、液位及温度传感器（8）、尿素供液管（9）、滤清器夹箍（10）、滤清器（11）、法兰盘（12）和密封圈（13）；电气接口（2）、进气口（4）、尿素出液口（5）和排气口（6）均设置于法兰盘（12）上；法兰盘（12）可封住尿素罐罐口，并通过密封圈（13）实现轴向密封；
其中，尿素出液口（5）与尿素供液管（9）相连，尿素供液管（9）另一端与设置尿素罐底部位置的滤清器（11）通过滤清器夹箍（10）固定连接；液位及温度传感器（8）位于尿素罐内，其通过电气接口（2）输出尿素液位和温度信号；尿素供液管（9）与滤清器（11）连接的管口处为阻尼孔（14）；尿素供液管（9）有至少一个折弯；
所述的尿素液供给模块还包括换热水管（7）、换热水管（7）的两端分别与进水口（1）和出水口（3）相连，换热水管（7）环绕于滤清器（11）周围，进水口（1）和出水口（3）均安装于法兰盘（12）上；
所述的阻尼孔（14）的孔径d存在关系式，
25Q2/（32π2P）≤d4 ≤D4/4P2
式中，P为尿素喷射压力，Q为尿素喷嘴流量，D为尿素出液口（5）孔径。
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