WO2017152422A1 - 热传导式浓度检测机构及尿素箱液位传感器 - Google Patents

热传导式浓度检测机构及尿素箱液位传感器 Download PDF

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WO2017152422A1
WO2017152422A1 PCT/CN2016/076164 CN2016076164W WO2017152422A1 WO 2017152422 A1 WO2017152422 A1 WO 2017152422A1 CN 2016076164 W CN2016076164 W CN 2016076164W WO 2017152422 A1 WO2017152422 A1 WO 2017152422A1
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Prior art keywords
heat
heat conduction
heating
conduction type
concentration detecting
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PCT/CN2016/076164
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English (en)
French (fr)
Inventor
顾一新
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东莞正扬电子机械有限公司
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Priority to PCT/CN2016/076164 priority Critical patent/WO2017152422A1/zh
Publication of WO2017152422A1 publication Critical patent/WO2017152422A1/zh

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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
    • 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
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
    • G01F23/64—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements
    • 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
    • Y02T10/40—Engine management systems

Definitions

  • the present application relates to the field of selective catalytic reduction technology, for example, to a heat conduction concentration detecting mechanism and a urea tank liquid level sensor.
  • the vehicle With the enforcement of the OBD on-board diagnostic system, the vehicle will be limited or even limited if the emission is not up to standard or the urea quality concentration does not meet the requirements. Therefore, with the implementation of foreign Euro 6 emission standards, quality sensors have become mandatory installation components. Based on the above, it is very important to check the accuracy of the quality of urea in the urea solution.
  • SCR system uses urea solution to catalytically reduce NOx; high-quality urea tank liquid level sensor is designed for diesel vehicle SCR system, and selective catalytic reduction of nitrogen oxides (NOx), thereby saving energy and reducing emissions.
  • NOx nitrogen oxides
  • the technology is Europe. The mainstream technology route, almost all European long-distance trucks and large buses use this technology.
  • the container for the urea aqueous solution is called a urea tank, and the urea tank of the related art is provided with a liquid level sensor, by which the urea solution can be sucked out on the one hand, and the urea solution in the urea tank can be used on the other hand. The liquid level is monitored.
  • the concentration of urea needs to be detected.
  • the commonly used urea concentration sensor has insufficient detection effect when there are bubbles and impurities in the urea.
  • a method for detecting the urea concentration by using a heat conduction type concentration detecting sensor is proposed, and the urea concentration is detected according to the difference in the heat transfer efficiency of different concentrations of urea.
  • the heat conduction concentration detecting sensor can be used at a constant temperature (low temperature, normal temperature, high temperature), but It needs to be carried out in a state where the temperature is smoothly heated, so the working process is seriously affected by the temperature shock.
  • the urea solution is relatively easy to freeze, the urea solution after icing cannot be sucked out. Therefore, when the urea is frozen at a low temperature, in order to normally output the urea solution, it is necessary to input a cooling liquid for thawing, and currently, for this problem, in urea
  • a heating device is arranged in the box, and the urea solution is heated by the heating device to prevent the urea solution from freezing.
  • the coolant enters the heating pipe, the temperature rises instantaneously. At this time, the rising temperature forms a temperature with the temperature of the concentration monitoring device itself. Impact, once the temperature suddenly rises, there is no way to read the actual urea concentration, which will seriously affect the accuracy of the concentration detection results.
  • Embodiments of the present invention provide a heat conduction concentration detecting mechanism capable of slowing down the heat diffusion speed at the position and reducing the influence of the rapid temperature change on the concentration detection during the urea heating process.
  • the embodiment of the invention further provides a heat conduction concentration detecting mechanism, wherein the urea temperature around the heat conduction concentration detecting sensor changes uniformly, and the influence of the temperature unevenness around the heat conduction type density detecting sensor on the concentration detection in the urea heating process is reduced.
  • the embodiment of the invention also provides a urea tank liquid level sensor, which has the functions of liquid level detection and concentration detection, has high detection precision, and can ensure effective utilization of urea.
  • a thermally conductive concentration detecting mechanism comprising: a heating device configured to heat a liquid to be detected, and a heat conduction concentration detecting sensor configured to detect a quality of the liquid to be detected, the heat conduction concentration detecting sensor
  • the peripheral portion is provided with a uniform heating device configured to slow the diffusion of heat emitted by the heating device to the speed of the heat conduction type concentration detecting sensor.
  • the uniform heating device is a heat insulating material provided on a heating section of the heating device corresponding to the heat conduction type density detecting sensor.
  • the heating device is a heating tube, and a heating section corresponding to the heat conduction type concentration detecting sensor on the heating tube is wound around the heat conduction type concentration detecting sensor Spiral arrangement.
  • the heating pipe is The respective positions of the heating segments corresponding to the heat conduction type concentration detecting sensor are the same as the shortest distance between the heat conduction type density detecting sensors.
  • the heat insulating material is disposed on a surface of the heating pipe and located on a side of the heating pipe adjacent to the heat conduction type concentration detecting sensor; or
  • the heat insulating material is a heat insulating sleeve disposed on a surface of the heating pipe; and/or the spirally arranged heating section located at a periphery of the heat conduction type concentration detecting sensor adopts a heat conduction performance lower than the heating pipe
  • the rest of the heating section is made of material.
  • the heating pipe includes a heating pipe inlet section and a heating pipe outlet section, and the heating pipe inlet section and the heating pipe outlet section pass the heating pipe
  • the "U"-shaped connecting segments are connected, and the heating tube "U"-shaped connecting segments are horizontally disposed under the heat-conducting concentration detecting sensor.
  • the heating pipe "U"-shaped connecting section is provided with a heat conducting sheet
  • the heat conducting type density detecting sensor is externally provided with a sensor housing, the sensor housing
  • the heat conducting sheet is fixedly connected to the heating tube.
  • the uniform heating device is a heat shield provided outside the heat conduction type density detecting sensor.
  • the heat shield includes a first heat insulation layer away from the heat conduction type concentration detecting sensor, and the first heat insulation layer and the heat conduction type a second heat insulation layer between the concentration detecting sensors, wherein the first heat insulating layer and the second heat insulating layer are connected by a plurality of connecting pipes, and the connecting pipes communicate with the heat insulating cover and the heat shield outside .
  • the heat shield may include a first heat insulation layer away from the heat conduction type concentration detecting sensor, and a second heat insulation layer between the first heat insulation layer and the heat conduction type density detecting sensor,
  • the first insulation layer is made of a material having a high coefficient of thermal expansion.
  • a urea tank level sensor comprising a fixed seat and a liquid level detecting device, further comprising a urea concentration detecting mechanism, wherein the urea concentration detecting mechanism employs a heat conduction type concentration detecting mechanism as described above.
  • the beneficial effects of the embodiments of the present invention are: providing a uniform heating device around the heat conduction type concentration detecting sensor, so that the temperature of the urea around the heat conduction type concentration detecting sensor is uniform during the heating process, and the temperature shock is reduced by detecting the concentration of the heat conduction type concentration detecting sensor. Influence; making low temperature heating required
  • the urea tank liquid level sensor used in the environment can use the heat conduction concentration detection sensor to measure the urea concentration. The measurement accuracy is high, and the test effect is not affected by the thermal shock.
  • the heating structure of the heating tube is arranged spirally around the urea concentration sensor.
  • the urea concentration sensor has a uniform temperature at the periphery.
  • FIG. 1 is a schematic structural view of a urea tank liquid level sensor according to Embodiment 1 of the present invention.
  • FIG. 2 is a schematic structural view of a concentration detecting mechanism according to Embodiment 1 of the present invention.
  • FIG. 3 is a cross-sectional view of a heating pipe corresponding to a heat conduction type concentration detecting sensor according to the first embodiment of the present invention, which is arranged in a spiral shape around the heat conduction type concentration detecting sensor;
  • Figure 4 is a cross-sectional view of the heat shield of the second embodiment of the present invention.
  • Figure 5 is a cross-sectional view of the heat shield of the third embodiment of the present invention.
  • 300 concentration detection mechanism; 310, heating tube; 311, heating tube inlet section; 312, heating tube outlet section; 313, heating tube "U” type connection section; 320, thermal insulation sleeve; 330, heat conduction concentration Detection sensor; 340, thermal pad;
  • a heat conduction concentration detecting sensor 501, a second heat insulating layer; 502, a first heat insulating layer; 503, a connecting pipe; 504, a heating pipe;
  • 600 a heat conduction concentration detecting sensor; 601, a second heat insulating layer; 602, a first heat insulating layer; 603, Transition chamber; 604, heating tube.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • the urea tank level sensor includes a fixing base 100, a liquid level detecting device 200, a heat conduction concentration detecting mechanism 300, and a urea configured to draw urea from the urea tank.
  • the liquid suction tube 400 is configured to fixedly connect the liquid level sensor to the urea tank, and the liquid level detecting device 200 includes an electron tube 201 fixedly connected to the fixing base 100 and sleeved on the electron tube 201 The float 202 on.
  • the heat conduction type concentration detecting mechanism 300 includes a heating device configured to heat a liquid to be detected, and a heat conduction type concentration detecting sensor 330 configured to detect a quality of the liquid to be detected, the heat conduction type concentration detecting sensor 330
  • the peripheral portion is provided with a uniform heating device capable of rapidly achieving urea concentration output while dissolving icy urea.
  • the heating device is a heating tube 310.
  • the heating tube 310 is made of a metal material having good thermal conductivity and corrosion resistance, and is heated by a heat transfer tube 310, and a coolant is injected into the heating tube 310. The heat carried by the coolant is transferred to the urea in the urea tank through the wall of the heating pipe 310.
  • the heating section corresponding to the heat conduction type concentration detecting sensor 330 of the heating tube 310 is spirally arranged around the heat conduction type density detecting sensor 330, so that it is in a heat conduction type.
  • the heat exchange area between the heating pipe 310 and the urea at the periphery of the concentration detecting sensor 330 is uniform, and the balance of the heat exchange amount is achieved as much as possible.
  • the transfer efficiency of the heat has a great relationship with the distance of the heat transfer.
  • the shortest distance is the same. That is, the heating tube 310 is close to the thermal sensing The distance from the tube wall to the thermal sensor is the same, ensuring uniform heat transfer.
  • the uniform heating device can reduce the impact caused by the rapid rise of the temperature around the heat conduction concentration detecting sensor 330, and the thickness of the pipe wall of the heating pipe 310 corresponding to the corresponding position can be increased to make the heating pipe 310 itself a uniform heating device, or in the portion.
  • the heat insulating material is added to the surface of the heating pipe 310 as a uniform heating device.
  • the uniform heating device is a heat insulating material disposed on the heating section of the heating pipe 310 corresponding to the heat conduction type concentration detecting sensor 330.
  • the heat insulating material employs a resin-based material having a heat transfer efficiency lower than that of the heating pipe 310.
  • the heat insulating material can be arranged in various forms. As shown in FIG. 3, in the embodiment, a heat insulating material covering the surface of the heating pipe 310 is used as the heat insulating device, but the heat insulating material is disposed in the heating mode. Insulation sleeve 320 on the surface of tube 310. The heat insulating material is disposed in the form of the heat insulating sleeve 320, and the heat pipe 310 can be thermally insulated at a position corresponding to the heat conduction concentration detecting sensor 330, thereby more effectively reducing the influence of heat shock on the heat conduction concentration sensor. To ensure that the output value of the heat conduction concentration sensor 330 is more accurate.
  • the heating pipe 310 includes a heating pipe inlet section 311 and a heating pipe outlet section 312, and the heating is performed.
  • the pipe inlet section 311 is connected to the inlet port provided on the fixing base 100
  • the heating pipe outlet section 312 is connected with a liquid return port provided on the fixing base 100, the heating pipe inlet section 311 and the heating pipe
  • the liquid discharge section 312 is vertically disposed in the urea tank in the installed state, and the heating pipe liquid inlet section 311 and the heating pipe liquid discharge section 312 are connected through the heating pipe "U" type connecting section 313 to form a complete coolant.
  • the heating pipe "U"-shaped connecting section 313 is horizontally disposed below the heat conduction type density detecting sensor 330.
  • the heating section located in the spiral portion of the heat conduction type concentration detecting sensor 330 may be a part of the heating pipe inlet section 311 or a part of the heating pipe outlet section 312, and since it is required to be evenly disposed at the section The heating device, therefore, the heating effect on the urea in the urea tank is inevitably lower than the other parts, the cooling liquid is lengthened as the moving stroke in the heating pipe 310 is lengthened, and the heating effect is also lowered, so in order to effectively use the cooling liquid The heat of the urea heats the urea to improve the heat utilization efficiency.
  • the heating section which is disposed in a spiral shape around the heat conduction type concentration detecting sensor 330 is disposed on the heating pipe liquid discharge section 312.
  • a heat conducting sheet 340 is disposed on the heating tube "U" type connecting section 313.
  • the mounting position of the heat conductive sheet 340 is located below the heat conduction type density detecting sensor 330.
  • the heat conduction type concentration detecting sensor 330 is externally provided with a sensor housing, and the sensor housing passes through the heat conducting sheet 340 and the adding
  • the heat pipe 310 is fixedly connected.
  • the heat conducting sheet 340 By providing the heat conducting sheet 340, on the one hand, the heat exchange area can be increased, the heat exchange efficiency can be improved, and the heat pipe 310 and the heat conduction type concentration detecting sensor 330 are simultaneously fixedly connected through the heat conducting sheet 340, thereby realizing the heat conduction type density detecting sensor 330 and the heating pipe 310.
  • the relative position is fixed to avoid the relative motion of the two, resulting in uneven heat exchange, which affects the concentration detection effect.
  • the heat pipe 310 can be fixed by the heat conducting piece 340 to avoid deformation of itself.
  • the thermally conductive concentration detecting mechanism 300 may further provide a heat insulating device in other manners.
  • the heat insulating material is disposed on a surface of the heating tube 310 and located on a side of the heating tube 310 adjacent to the heat conduction type concentration detecting sensor 330.
  • the heat in the heating pipe 310 can be transmitted away from the heat conduction type concentration detecting sensor 330, and the urea temperature can be reduced as much as possible while avoiding the urea temperature change around the heat conduction type density detecting sensor 330. The effect of the effect.
  • a heating section located at a periphery of the heat conduction type concentration detecting sensor 330 may be formed using a material having a thermal conductivity lower than that of the remaining heating sections of the heating tube 310, so that the speed at which the heat itself diffuses from the partial heating section into the surrounding urea decreases, that is, The segment heating tube 310 itself forms the thermal insulation device.
  • the heating section using this structure can be welded to the remaining heating section by means of a transition welding material or by a flange seal.
  • the manner of connecting the heating section and the other partial heating sections located at the periphery of the heat conduction type concentration detecting sensor 330 by using the transient welding is employed.
  • the urea tank liquid level sensor In the working process, the urea tank liquid level sensor according to the embodiment of the invention is installed in the urea tank, and the cooling liquid for heating the urea flows along the heating pipe inlet section 311, and passes through the heating pipe 310 wall and the urea tank.
  • the urea heat exchange realizes heat treatment of the urea.
  • the coolant flows to the "U"-shaped connecting section 313 of the heating pipe, heat is transferred to the heat conducting sheet 340 through the pipe wall, and is heated by the heat conducting piece 340 for the urea.
  • the coolant enters the heating pipe outlet section 312 through the heat pipe "U" type connecting section.
  • the heating pipe 310 on the section is provided with the heat insulating sleeve 320 corresponding to the surface of the heating section of the heat conduction type concentration detecting sensor 330, the heat is applied thereto.
  • the rate of diffusion into the urea is slow, thereby ensuring a slow and uniform change in the urea temperature around the heat conduction concentration detecting sensor 330.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • the concentration detecting mechanism includes a heating device configured to heat the urea, and a heat conduction type concentration detecting sensor 500 configured to detect the quality of the urea, the peripheral portion of the heat conduction type density detecting sensor 500 being configured to be slowed down A uniform heating device that dissipates heat radiated from the heating device to the speed of the heat conduction concentration detecting sensor 500.
  • the uniform heating device described in this embodiment is a heat shield disposed outside the heat conduction concentration detecting sensor 500, and the urea directly heated by the heating pipe 504 is separated from the partition by the heat shield.
  • the urea inside the heat shield and located between the heat shield and the heat conduction concentration detecting sensor 500 is separated to reduce the heat conduction path between the two, thereby avoiding the temperature variation range of the urea around the heat conduction concentration detecting sensor 500, so that It changes evenly.
  • the heat shield of the embodiment may include a first heat insulation layer 502 and a second heat insulation layer 501, the first heat insulation layer 502 being away from the heat conduction concentration detecting sensor 500, the second heat insulation layer 501 is disposed between the first thermal insulation layer 502 and the thermal conduction concentration detecting sensor 500, and a heat insulating cavity is formed between the first thermal insulation layer 502 and the second personal layer, in order to reduce the thermal insulation cavity.
  • the heat-insulating effect of the embodiment is that the heat-insulating chamber is a vacuum chamber, and the first heat-insulating layer 502 and the second heat-insulating layer 501 are connected through a plurality of connecting tubes 503, and the connecting tubes 503 are connected.
  • the urea can flow between the inside and the outside of the heat shield through the connecting pipe 503, and heat between the internal urea and the external urea passes through the connecting pipe 503 Urea transfer, in order to ensure uniform heat transfer, the plurality of connecting pipes 503 are evenly arranged on the surface of the heat shield.
  • the size of the heat transfer passage is reduced in the embodiment, the speed of the temperature change can be reduced, and the uniformity of the temperature change is ensured.
  • Embodiment 3 is a diagrammatic representation of Embodiment 3
  • FIG. 5 is a cross-sectional view of a heat shield according to Embodiment 3 of the present invention.
  • the structure of the urea tank liquid level sensor in this embodiment is substantially the same as that of the foregoing embodiment, and the uniform heating device is also disposed at the heat conduction concentration.
  • the heat shield outside the sensor 600 is detected, and the heat shield in the embodiment also includes a first heat insulation layer 602 and a second heat insulation layer 601. There may be a difference between the first embodiment and the second heat insulating layer 601 in the embodiment, and the first heat insulating layer 602 is not connected to the second heat insulating layer 601.
  • a transition cavity 603 is formed between the second heat insulation layer 601.
  • the first heat insulation layer 602 is provided with a first through hole
  • the second heat insulation layer 601 is provided with a second through hole, a first through hole and a second through hole. Configured as the flow of urea, when the urea outside the heat shield is heated by the heating tube 604, the heat is diffused to The first thermal diffusion is performed in the cavity 603, and becomes uniform in the transition cavity 603, and then enters the inside of the heat shield through the second through hole to heat the urea inside, thereby ensuring the periphery of the heat conduction concentration detecting sensor 600.
  • the temperature change of urea is uniform and gentle, and the accuracy of the concentration test is not affected.
  • the first heat insulating layer 602 may be made of a material having a high thermal expansion coefficient, which may occur when heated by external urea. The expansion expands the volume of the transition chamber 603 to make the expansion of heat in the transition chamber 603 more sufficient.
  • the first heat insulation layer 602 may be made of one of copper, aluminum, manganese, magnesium, silver, lead, and cadmium. In the embodiment, the first heat insulation layer 602 is made of copper.
  • the present application discloses a heat conduction concentration detecting mechanism including a heating device configured to heat a liquid to be detected, and a heat conduction concentration detecting sensor configured to detect a quality of the liquid to be detected, the heat conduction concentration detecting sensor A uniform heating device is provided on the circumference.
  • the invention also discloses a urea tank liquid level sensor using the same, so that the urea tank liquid level sensor used in the low temperature heating environment can be used for the urea concentration measurement by the heat conduction concentration detecting sensor, the measurement precision is high, and the test effect is not heated. The impact of the impact.

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Abstract

一种热传导式浓度检测机构（300），包括被配置为加热待检测液体的加热装置（310），以及被配置为检测待检测液体的品质的热传导式浓度检测传感器（330），热传导式浓度检测传感器（330）的周部设置有均匀加热装置（320）。一种应用其的尿素箱液位传感器，采用热传导式浓度检测传感器（330）进行尿素浓度测量，测量精度高，测试效果不会受热冲击的影响。

Description

热传导式浓度检测机构及尿素箱液位传感器 技术领域
本申请涉及选择性催化还原技术领域，例如涉及一种热传导式浓度检测机构及尿素箱液位传感器。
背景技术
随着国四标准和更高排放标准的全面执行，所有重型商用车被要求安装SCR系统或等同的排放后处理装置，而当前绝大部分车厂优先使用选择性催化还原系统-SCR系统，因而需要使用尿素。车用尿素溶液需要保证在一定的浓度范围才可充分的将氧化物转化为氮气和水，浓度过高会带来NH3的二次污染，浓度过低则达不到排放标准要求，而基于欺骗使用自来水、海水或者误加柴油等其他溶剂甚至可能会造成上万元的后处理系统被损坏。随着OBD车载诊断系统的强制执行，在排放不达标或者尿素品质浓度不符合要求的情况下，车辆会被限扭，甚至限制启动。因此随着国外欧六排放标准的实施，品质传感器成为强制安装部件。基于上述情况，检测尿素在尿素溶液中的品质的准确性非常重要。
SCR系统利用尿素溶液催化还原NOx；高品质尿素罐液位传感器为柴油车SCR系统配套设计，对氮氧化物(NOx)进行选择性催化还原，从而既节能、又减排，该项技术是欧洲主流技术路线，欧洲长途载货车和大型客车几乎全部采用这一技术。作为尿素水溶液的盛放容器称为尿素箱，相关技术中的尿素箱上设置有液位传感器，利用该液位传感器一方面可将尿素溶液吸出，另一方面可对尿素箱内之尿素溶液的液位进行监测。
在SCR系统中不仅需要了解尿素箱中的液位高度，还需要对尿素的浓度进行检测，目前常用的尿素浓度传感器，当尿素中存在气泡及杂质时检测效果不够理想。
鉴于上述情况，提出一种采用热传导式浓度检测传感器对尿素浓度进行检测的方法，根据不同浓度的尿素导热效率不同这一特性检测尿素浓度。
热传导式浓度检测传感器可以在恒温状态下使用(低温、常温、高温)，但 是需要在温度平稳加热的状态下进行，所以其工作过程受温度冲击的影响十分严重。
但是由于尿素溶液比较容易结冰，结冰后的尿素溶液无法被吸出，因此当尿素在低温下结冰之后，为了能正常输出尿素溶液，需要输入冷却液进行解冻，目前针对这个问题，在尿素箱中加设有加热装置，利用加热装置对尿素溶液进行加热，防止尿素溶液结冰，冷却液进入加热管时，温度瞬间上升，此时，上升的温度与浓度监测装置本身的温度形成一个温度冲击，温度一旦骤然上升，就没办法读取实际的尿素浓度，会严重影响浓度检测结果的准确性。
发明内容
本发明实施例提供一种热传导式浓度检测机构，其能够减缓该位置的热量扩散速度，降低对尿素加热过程中温度变化快对浓度检测造成的影响。
本发明实施例还提供一种热传导式浓度检测机构，其热传导式浓度检测传感器周围的尿素温度变化均匀，降低对尿素加热过程热传导式浓度检测传感器周围温度不均匀对浓度检测造成的影响。
本发明实施例还提供一种尿素箱液位传感器，同时具有液位检测、浓度检测的功能，检测精度高，能够保证尿素的有效利用。
本发明实施例可以采用以下技术方案：
一方面，提供一种热传导式浓度检测机构，包括被配置为加热待检测液体的加热装置，以及被配置为检测所述待检测液体的品质的热传导式浓度检测传感器，所述热传导式浓度检测传感器的周部设置有被配置为减缓所述加热装置散发的热量扩散至所述热传导式浓度检测传感器的速度的均匀加热装置。
作为所述的热传导式浓度检测机构的一种技术方案，所述均匀加热装置为设置在所述加热装置上与所述热传导式浓度检测传感器相对应的加热段的隔热材料。
作为所述的热传导式浓度检测机构的一种技术方案，所述加热装置为加热管，所述加热管上与所述热传导式浓度检测传感器相对应的加热段绕所述热传导式浓度检测传感器呈螺旋状布置。
作为所述的热传导式浓度检测机构的一种技术方案，所述加热管上与所述 热传导式浓度检测传感器相对应的加热段的各个位置与所述热传导式浓度检测传感器之间的最短距离相同。
作为所述的热传导式浓度检测机构的一种技术方案，所述隔热材料设置在所述加热管表面，并位于所述加热管靠近所述热传导式浓度检测传感器的一侧；或，所述隔热材料为设置在所述加热管表面的隔热套管；和/或，位于所述热传导式浓度检测传感器周部的所述呈螺旋状布置的加热段采用导热性能低于所述加热管的其余加热段的材料制成。
作为所述的热传导式浓度检测机构的一种技术方案，所述加热管包括加热管进液段以及加热管出液段，所述加热管进液段与所述加热管出液段通过加热管“U”型连接段连接，所述加热管“U”型连接段水平设置于所述热传导式浓度检测传感器下方。
作为所述的热传导式浓度检测机构的一种技术方案，所述加热管“U”型连接段上设置有导热片，所述热传导式浓度检测传感器外部设置有传感器壳体，所述传感器壳体通过所述导热片与所述加热管固定连接。
作为所述的热传导式浓度检测机构的一种技术方案，所述均匀加热装置为设置在所述热传导式浓度检测传感器外部的隔热罩。
作为所述的热传导式浓度检测机构的一种技术方案，所述隔热罩包括远离所述热传导式浓度检测传感器的第一隔热层，以及位于所述第一隔热层与所述热传导式浓度检测传感器之间的第二隔热层，所述第一隔热层与所述第二隔热层之间通过若干连接管实现连接，所述连接管连通隔热罩内部与隔热罩外部。
所述隔热罩可以包括远离所述热传导式浓度检测传感器的第一隔热层，以及位于所述第一隔热层与所述热传导式浓度检测传感器之间的第二隔热层，所述第一隔热层采用高热膨胀系数的材料制成。
另一方面，提供一种尿素箱液位传感器，包括固定座以及液位检测装置，还包括尿素浓度检测机构，所述尿素浓度检测机构采用如上所述的热传导式浓度检测机构。
本发明实施例的有益效果为：在热传导式浓度检测传感器周部设置均匀加热装置，使得加热过程中热传导式浓度检测传感器周围的尿素升温均匀，降低温度冲击对热传导式浓度检测传感器检测浓度造成的影响；使得需要低温加热 环境下使用的尿素箱液位传感器可以采用热传导式浓度检测传感器进行尿素浓度测量，测量精度高，测试效果不会受热冲击的影响，采用尿素浓度传感器周部螺旋状布置加热管的加热结构，使得尿素浓度传感器周部温度均匀。
附图概述
下面根据附图和实施例对本发明进行详细说明。
图1为本发明实施例一所述的尿素箱液位传感器结构示意图；
图2为本发明实施例一所述的浓度检测机构结构示意图；
图3为本发明实施例一所述的与热传导式浓度检测传感器相对应的加热段采用绕所述热传导式浓度检测传感器呈螺旋状布置的加热管的截面图；
图4为本发明实施例二所述的隔热罩截面图；
图5为本发明实施例三所述的隔热罩截面图。
图1-3中：
100、固定座；
200、液位检测装置；201、电子管；202、浮子；
300、浓度检测机构；310、加热管；311、加热管进液段；312、加热管出液段；313、加热管“U”型连接段；320、隔热套管；330、热传导式浓度检测传感器；340、导热片；
400、吸液管；
图4中：
热传导式浓度检测传感器；501、第二隔热层；502、第一隔热层；503、连接管；504、加热管；
图5中：
600、热传导式浓度检测传感器；601、第二隔热层；602、第一隔热层；603、 过渡腔；604、加热管。
本发明的实施方式
下面结合附图并通过实施方式说明本发明的技术方案。
为使本发明实施例解决的技术问题、采用的技术方案和达到的技术效果更加清楚，下面将结合附图对本发明实施例的技术方案进行详细描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
实施例一：
如图1～3所示，在本实施例中，所述的尿素箱液位传感器包括固定座100、液位检测装置200、热传导式浓度检测机构300以及被配置为从尿素箱中吸取尿素的吸液管400，所述固定座100被配置为将液位传感器与尿素箱固定连接，所述液位检测装置200包括与所述固定座100固定连接的电子管201以及套设在所述电子管201上的浮子202。
所述的热传导式浓度检测机构300包括被配置为加热待检测液体的加热装置，以及被配置为检测所述待检测液体的品质的热传导式浓度检测传感器330，所述热传导式浓度检测传感器330的周部设置有均匀加热装置，所述均匀加热装置在溶解结冰尿素的同时能够快速实现尿素浓度输出。
于本实施例中，加热装置为加热管310，加热管310采用具有良好导热性能且耐腐蚀的金属材料制成，通过加热管310进行换热式加热，通过在加热管310内部注入冷却液，使冷却液携带的热量通过加热管310管壁传递给尿素箱中的尿素。为了保证热传导式浓度检测传感器330四周的尿素温度变化均匀，将加热管310与热传导式浓度检测传感器330相对应的加热段采用绕所述热传导式浓度检测传感器330呈螺旋状布置，使得处于热传导式浓度检测传感器330周部的加热管310与尿素之间的换热面积均匀，尽可能的实现换热量的平衡。
热量的传递效率与其传递的距离具有很大关系，本实施例中所述加热管310与所述热传导式浓度检测传感器330相对应的加热段的各个位置与所述热传导式浓度检测传感器330之间的最短距离相同。即使得加热管310靠近热敏传感 器一侧管壁至热敏传感器的距离相同，保证热量传递均匀。
设置均匀加热装置可以降低热传导式浓度检测传感器330周围温度快速上升造成的冲击，可以采用增加相应位置的加热管310的管壁厚度使该部分加热管310本身成为均匀加热装置，也可以在该部分加热管310表面增加隔热材料作为均匀加热装置，本实施例中所述均匀加热装置为设置在所述加热管310与所述热传导式浓度检测传感器330相对应的加热段的隔热材料。所述隔热材料采用热传递效率低于加热管310的制造材料的树脂类材料。
隔热材料的设置形式可以为多种，如图3所示，本实施例中采用覆盖于加热管310表面的隔热材料作为隔热装置，但是隔热材料的设置方式为设置在所述加热管310表面的隔热套管320。采用隔热套管320的形式设置隔热材料，能够全面的对加热管310与热传导式浓度检测传感器330相对应的位置进行隔热，从而更为高效的减缓热量冲击对热传导式浓度传感器的影响，确保热传导式浓度传感器330输出值更精准。
在本发明的实施例中还对加热管310的结构进行了详细说明，如图1、2所示，所述加热管310包括加热管进液段311以及加热管出液段312，所述加热管进液段311与设置在固定座100上的进液口连接，加热管出液段312与设置在固定座100上的回液口连接，所述加热管进液段311与所述加热管出液段312在安装状态下于尿素箱中竖直设置，所述加热管进液段311与所述加热管出液段312通过加热管“U”型连接段313连接，形成完整的冷却液通路，所述加热管“U”型连接段313水平设置于所述热传导式浓度检测传感器330下方。
位于所述热传导式浓度检测传感器330周部呈螺旋状布置的加热段可以为加热管进液段311的一部分，也可以为加热管出液段312的一部分，而由于在该段处需要设置均匀加热装置，因此其对尿素箱中的尿素的加热效果必然低于其它部分，冷却液随着在加热管310中的运动行程加长而温度降低，加热效果也随之下降，因此为了有效利用冷却液的热量对尿素进行加热，提高热量利用效率，本实施例中将位于所述热传导式浓度检测传感器330周部呈螺旋状布置的加热段设置在加热管出液段312上。
所述加热管“U”型连接段313上设置有导热片340。所述导热片340的安装位置位于热传导式浓度检测传感器330的下方。所述热传导式浓度检测传感器330外部设置有传感器壳体，所述传感器壳体通过所述导热片340与所述加 热管310固定连接。通过设置导热片340，一方面可以增加换热面积，提高换热效率，同时通过导热片340同时固定连接加热管310以及热传导式浓度检测传感器330，从而实现热传导式浓度检测传感器330与加热管310之间相对位置的固定，避免两者发生相对运动导致换热不均匀，而影响浓度检测效果，再一方面通过设置导热片340可以对加热管310本身进行固定，避免其自身发生变形。
在本发明的其它实施例中，所述的热传导式浓度检测机构300还可以采用其它方式设置隔热装置。
例如，在本发明的其他实施例中，所述隔热材料设置在所述加热管310表面，并位于所述加热管310靠近所述热传导式浓度检测传感器330的一侧。通过上述方式设置隔热材料，可以使加热管310中的热量向远离热传导式浓度检测传感器330的方向传递，在避免热传导式浓度检测传感器330周围尿素温度变换过快的同时尽量降低对尿素的加热效果的影响。
又例如，可以采用导热性能低于加热管310其余加热段的材料制作位于热传导式浓度检测传感器330周部的加热段，使得热量本身从该部分加热段扩散至周围尿素中的速度下降，即该段加热管310自身形成所述隔热装置。采用该结构的加热段可通过过渡焊材与其余加热段进行焊接连接，也可通过法兰密封件实现连接。考虑到加热管310的尺寸以及安装的便捷性，本实施例中采用使用过渡焊焊接连接位于热传导式浓度检测传感器330周部的加热段与其它部分加热段的方式。
工作过程中，将本发明实施例所述的尿素箱液位传感器安装在尿素箱中，用于加热尿素的冷却液沿加热管进液段311流入，并通过加热管310管壁与尿素箱中的尿素换热，实现对尿素的加热处理，当冷却液流至加热管“U”型连接段313，热量通过管壁传递至导热片340，并通过导热片340为尿素加热。冷却液通过热管“U”型连接段进入加热管出液段312，由于在本段上的加热管310对应热传导式浓度检测传感器330的加热段表面设置有隔热套管320，因此该处热量向尿素中扩散的速度缓慢，从而保证热传导式浓度检测传感器330周围的尿素温度缓慢均匀变化。
实施例二：
图4为本实施例所述的隔热罩截面图，本实施例中尿素箱液位传感器的结构与前述实施例基本相同，均为提供一种基于热传导式浓度检测传感器500的 浓度检测机构，包括被配置为加热尿素的加热装置，以及被配置为检测所述尿素的品质的热传导式浓度检测传感器500，所述热传导式浓度检测传感器500的周部设置有被配置为减缓所述加热装置散发的热量扩散至所述热传导式浓度检测传感器500的速度的均匀加热装置。
如图4所示，本实施例中所述的均匀加热装置为设置在所述热传导式浓度检测传感器500外部的隔热罩，通过隔热罩将直接受加热管504加热的尿素与所述隔热罩内部并位于隔热罩与所述热传导式浓度检测传感器500之间的尿素进行分隔，减少两者之间的热传导通道，从而避免热传导式浓度检测传感器500周围的尿素的温度变化幅度，使其均匀变化。
本实施例所述的隔热罩可以包括第一隔热层502以及第二隔热层501，所述第一隔热层502远离所述热传导式浓度检测传感器500，所述第二隔热层501设置在所述第一隔热层502与所述热传导式浓度检测传感器500之间，所述第一隔热层502与所述第二个人层之间形成隔热腔，为了降低隔热腔的导热效果，本实施例中所述隔热腔为真空腔，所述第一隔热层502与所述第二隔热层501之间通过若干连接管503实现连接，所述连接管503连通隔热罩内部与隔热罩外部，所述尿素可通过所述连接管503在所述隔热罩的内部与外部之间流动，同时内部尿素与外部尿素之间的热量通过连接管503中的尿素传递，为了保证热量传递均匀，所述连接管503为多个，在所述隔热罩的表面均匀布置。
由于液体温度变化速度越快，其变化的均匀性反应的就更加明显，因此本实施例中减小了热量传递通道的尺寸，可以降低温度变化的速度，同时保证了温度变化的均匀性。
实施例三：
图5为本发明实施例三所述的隔热罩截面图，本实施例中尿素箱液位传感器的结构与前述实施例基本相同，所述的均匀加热装置同样为设置在所述热传导式浓度检测传感器600外部的隔热罩，且本实施例中所述隔热罩同样包括第一隔热层602以及第二隔热层601。本实施例与前述实施例之间可以存在如下区别：本实施例中所述第一隔热层602与所述第二隔热层601之间并不固定连接，在第一隔热层602与第二隔热层601之间形成过渡腔603，第一隔热层602上设置有第一通孔，第二隔热层601上设置有第二通孔，第一通孔与第二通孔被配置为尿素的流动，当隔热罩外部的尿素受加热管604的加热后，热量扩散至过 渡腔603中进行第一次热扩散，在过渡腔603中变得均匀后再通过第二通孔进入到隔热罩内部对内部的尿素进行加热，从而保证，对热传导式浓度检测传感器600周围的尿素的温度变化影响均匀且平缓，保证浓度测试精度不受影响。
为了加强本实施例所述技术方案的技术效果，本实施例中还可以采用将所述第一隔热层602采用具有较高的热膨胀系数的材料制成，当其受到外部尿素加热后会发生膨胀，从而增加过渡腔603的容积，使热量在所述过渡腔603中的扩撒更加充分。
所述第一隔热层602可以采用铜、铝、锰、镁、银、铅、镉中的一种材料制成。于本实施例中所述第一隔热层602采用铜制成。
于本实施例中，术语“第一”、“第二”仅用于在描述上加以区分，并没有特殊的含义。
需要声明的是，上述内容仅仅为本发明的实施例及技术方案，在本发明所公开的技术范围内，任何熟悉本技术领域的技术人员所容易想到的变化或替换，都应涵盖在本发明的保护范围内。
工业实用性
本申请公开了一种热传导式浓度检测机构，包括被配置为加热待检测液体的加热装置，以及被配置为检测所述待检测液体的品质的热传导式浓度检测传感器，所述热传导浓度检测传感器的周部设置有均匀加热装置。本申请还公开了一种应用其的尿素箱液位传感器，使得需要低温加热环境下使用的尿素箱液位传感器可以采用热传导式浓度检测传感器进行尿素浓度测量，测量精度高，测试效果不会受热冲击的影响。

Claims (10)

  1. 一种热传导式浓度检测机构，包括被配置为加热待检测液体的加热装置，以及被配置为检测所述待检测液体的品质的热传导式浓度检测传感器，所述热传导浓度检测传感器的周部设置有均匀加热装置。
  2. 根据权利要求1所述的热传导式浓度检测机构，其中，所述加热装置为加热管，所述加热管上与所述热传导式浓度检测传感器相对应的加热段绕所述热传导式浓度检测传感器呈螺旋状布置。
  3. 根据权利要求2所述的热传导式浓度检测机构，其中，所述均匀加热装置为设置在所述加热装置上与所述热传导式浓度检测传感器相对应的加热段的隔热材料。
  4. 根据权利要求3所述的热传导式浓度检测机构，其中，所述加热管上与所述热传导式浓度检测传感器相对应的加热段的各个位置与所述热传导式浓度检测传感器之间的最短距离相同。
  5. 根据权利要求3所述的热传导式浓度检测机构，其中，所述隔热材料设置在所述加热管表面，并位于所述加热管靠近所述热传导式浓度检测传感器的一侧：
    或，所述隔热材料为设置在所述加热管表面的隔热套管。
  6. 根据权利要求3所述的热传导式浓度检测机构，其中，所述加热管包括加热管进液段以及加热管出液段，所述加热管进液段与所述加热管出液段通过加热管“U”型连接段连接，所述加热管“U”型连接段水平设置于所述热传导式浓度检测传感器下方。
  7. 根据权利要求6所述的热传导式浓度检测机构，其中，所述加热管“U”型连接段上设置有导热片，所述热传导式浓度检测传感器外部设置有传感器壳 体，所述传感器壳体通过所述导热片与所述加热管固定连接；
    和/或，位于所述热传导式浓度检测传感器周部的所述呈螺旋状布置的加热段采用导热性能低于所述加热管的其余加热段的材料制成。
  8. 根据权利要求1所述的热传导式浓度检测机构，其中，所述均匀加热装置为设置在所述热传导式浓度检测传感器外部的隔热罩。
  9. 根据权利要求8所述的热传导式浓度检测机构，其中，所述隔热罩包括远离所述热传导式浓度检测传感器的第一隔热层，以及位于所述第一隔热层与所述热传导式浓度检测传感器之间的第二隔热层，所述第一隔热层与所述第二隔热层之间通过若干连接管实现连接，所述连接管连通隔热罩内部与隔热罩外部。
  10. 一种尿素箱液位传感器，包括固定座以及液位检测装置，还包括尿素浓度检测机构，所述尿素浓度检测机构采用权利要求1至9中任一项所述的热传导式浓度检测机构。
PCT/CN2016/076164 2016-03-11 2016-03-11 热传导式浓度检测机构及尿素箱液位传感器 WO2017152422A1 (zh)

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