CN112539098B - Urea concentration sensor device - Google Patents
Urea concentration sensor device Download PDFInfo
- Publication number
- CN112539098B CN112539098B CN201910892155.3A CN201910892155A CN112539098B CN 112539098 B CN112539098 B CN 112539098B CN 201910892155 A CN201910892155 A CN 201910892155A CN 112539098 B CN112539098 B CN 112539098B
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- urea
- liquid
- filter screen
- concentration sensor
- opening
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- 239000004202 carbamide Substances 0.000 title claims abstract description 101
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 100
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 239000007788 liquid Substances 0.000 claims description 56
- 239000004033 plastic Substances 0.000 claims description 19
- 229920003023 plastic Polymers 0.000 claims description 19
- 238000002844 melting Methods 0.000 claims description 8
- 230000008018 melting Effects 0.000 claims description 7
- 239000000110 cooling liquid Substances 0.000 claims description 5
- 239000006260 foam Substances 0.000 claims 2
- 238000001914 filtration Methods 0.000 abstract description 7
- 239000004744 fabric Substances 0.000 abstract description 3
- 238000005538 encapsulation Methods 0.000 abstract 2
- 239000000243 solution Substances 0.000 description 17
- 238000010438 heat treatment Methods 0.000 description 13
- 239000007789 gas Substances 0.000 description 12
- 239000000523 sample Substances 0.000 description 12
- 238000010586 diagram Methods 0.000 description 8
- 238000002347 injection Methods 0.000 description 8
- 239000007924 injection Substances 0.000 description 8
- 238000010531 catalytic reduction reaction Methods 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 239000002861 polymer material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- -1 and its inlet Substances 0.000 description 1
- 239000003125 aqueous solvent Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 150000003672 ureas Chemical class 0.000 description 1
Classifications
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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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
-
- 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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
-
- 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]
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The utility model provides a urea concentration sensor device, includes a sensor encapsulation, its characterized in that, including filtering the screen panel, it includes an inside cavity, screen cloth and skeleton to filter the screen panel, the sensor encapsulation stretches into to inside cavity, detects the urea solution after the screen cloth filters to get rid of the influence of impurity to the signal.
Description
Technical Field
The invention belongs to the technical field of engine exhaust aftertreatment, and particularly relates to a NOx Selective Catalytic Reduction (SCR) system for engine exhaust aftertreatment and a control technology thereof.
Background
With the increasing awareness of environmental protection, the emission standards of engines and vehicles are also becoming more stringent, and currently, the use of a NOx selective catalytic reduction (scr= Selective Catalytic Reduction) technology capable of performing catalytic reduction treatment in an oxygen-rich environment is the main technological route for NOx pollutant treatment.
The SCR technology requires that, for example, a urea aqueous solution (also called diesel exhaust gas treatment solution def= Diesel Exhaust Fluid, or blue addition solution AdBlue) having a concentration of 32.5% by weight is quantitatively injected into diesel engine exhaust gas, and the diesel engine exhaust gas is decomposed into ammonia gas at a high temperature, mixed with the exhaust gas, and then enters an SCR catalytic converter, and the ammonia gas undergoes a catalytic reduction reaction with NOx and the like in engine exhaust gas under the action of a catalyst, so that NOx is decomposed into harmless N2 and H2O. If the amount of DEF injected does not match the NOx content in the exhaust gas or the urea solution quality is not satisfactory, either the NOx cannot be fully reduced and decomposed, the emission is increased, or a large amount of ammonia remains to be discharged to the atmosphere, causing secondary pollution.
However, the quality of the urea aqueous solution as an important reagent is often controlled only at the time of shipment or inspection, and a device capable of detecting the concentration of the urea aqueous solution is not provided in many post-treatment systems. In order to reduce the use cost, a poor-quality urea solution or an aqueous solvent is added into the urea solution, so that the quality of the urea solution is uneven, and the treatment effect of tail gas NOx is seriously affected. It is therefore necessary to provide a sensor in the device that can detect the concentration of urea.
The existing urea concentration sensor is mainly divided into an optical type and an ultrasonic type, a sensor probe needs to be immersed in urea solution, in order to avoid interference of impurities and bubbles in the working process, the device is generally additionally packaged outside the concentration sensor, but the peripheral packaging is required to ensure that liquid inlet of the device is smooth, and a liquid inlet channel is not easy to accumulate dirt or be blocked by the dirt, so that the concentration sensor packaging has the defects of complex structure, high manufacturing cost and the like.
Disclosure of Invention
The invention aims at solving the problems and aims at providing a urea concentration sensor device which has simple structure, good adaptability and low cost.
In order to achieve the above purpose, the invention adopts the following technical scheme that the urea concentration sensor device comprises a sensor probe body and a filter screen cover with an inner cavity, wherein the sensor probe body extends into the inner cavity.
The urea concentration sensor device is applied to an SCR module and comprises a plastic cover with a urea liquid outlet nozzle, a support, a liquid storage tank, a urea pump, a urea liquid conveying pipe connected with the urea pump and the urea liquid outlet nozzle and sensors fixed on the support, wherein the sensors comprise a urea concentration sensor, a temperature sensor and a liquid level sensor.
An alternative design scheme of the filter screen cover is that the filter screen cover belongs to a first-stage filter screen arranged in urea solution. The first-level filter screen is deep into the urea box, and the filter screen cover further comprises an exhaust bubble connecting nozzle communicated with the cavity, and the exhaust bubble connecting nozzle is positioned at the upper part of the filter screen, so that internal bubbles are smoothly discharged.
The exhaust bubble nozzle comprises an extension, the outlet of which opens into the gas space above the liquid surface. The extension section can also be an external bubble discharging pipe, one end of the external bubble discharging pipe is connected with the air discharging bubble connecting nozzle, and the outlet at the other end of the external bubble discharging pipe is communicated with the space above the liquid level, so that the air in the filter screen cover can be smoothly discharged.
The outlet of the exhaust bubble tube includes a bend or a filter cover to prevent dirt from entering from the mouth end.
Further, the cross section of the filter screen cover can be in a circular ring shape or other inclined planes which are beneficial to dirt falling.
The support of the SCR module is a connecting frame made of stainless steel, the urea pump can be vertically or horizontally placed through the support and is arranged at one end of the support, the plastic cover is arranged at the other end of the support, the support is relatively fixed with the liquid storage tank through the plastic cover, and the urea pump device penetrates into the position near the bottom of the liquid storage tank through the support. The first-stage filter screen can be selectively arranged at the position of a liquid inlet of the urea pump, urea liquid filtered by the filter screen cover forms high-pressure injection solution through the urea pump and is output through a urea liquid conveying pipe and a urea liquid outlet connector of the plastic cover, and the urea liquid conveying pipe is made of metal or high polymer materials, can be a shaped rigid pipe or a bendable flexible pipe, and is convenient to install and arrange and can ensure stable conveying of the high-pressure liquid.
Above-mentioned, the support is the return circuit that can be formed by the heating pipe, and the ice-melt liquid that passes through in the heating pipe is engine coolant, and its inlet, liquid outlet set up on the plastics lid. The circuit of the level sensor and the temperature sensor are enclosed in the same conduit, which may be a plastic tube, arranged up and down the heating pipe loop. The urea solubility sensor device and other working components in the liquid outlet tank are fixed on the bracket in a mode of being beneficial to ice melting. When the ambient temperature is lower than-11 ℃, the urea solution can freeze, at the moment, after the engine is started, cooling liquid is required to be introduced into the heating pipe, and under the condition that the temperature of the cooling liquid rises, and under the condition that the urea pump is built-in, when the liquid DEF is judged to reach a certain amount, the urea pump can work with safe current to perform self-heating. The urea concentration sensor device is arranged on the same side as the urea pump and is positioned at the bottom of the liquid storage tank, and ice melting benefits from the heating pipe and the urea pump to do work.
The urea pump is a pulse driving pump and comprises a solenoid device and a plunger pump driven by the solenoid device, the plunger pump comprises a liquid inlet and a liquid outlet, the urea pump is controlled by a control unit, the control unit comprises a singlechip, a pulse pump driving circuit, a sensor signal processing circuit and a CAN bus data transceiver, the control unit CAN be selectively arranged on a plastic cover and arranged outside a liquid storage tank. The control unit obtains the corresponding driving pulse number by receiving the demand information of the vehicle on the injection quantity and according to the pre-stored characteristic parameters of the urea pump, meanwhile, the control unit judges whether the current state meets the injection condition according to the information of the temperature, the liquid level and the concentration of the urea solution in the liquid storage tank, if the current state does not meet the current state, the control unit sends corresponding alarm information through the CAN bus, and if the current state does not meet the current state, the control unit sends a driving signal to the solenoid driving device and sends information about the state of the urea pump through the CAN bus. Wherein the sensor signal processing circuit includes associated logic that converts the analog signal to a digital signal and transmits the digital signal to the CAN bus.
The other alternative design scheme of the filter screen cover is that the filter screen cover comprises a second-level filter screen, the filter screen cover belongs to the second-level filter screen, and the second-level filter screen cover is arranged in a urea conveying pipe covered with plastic.
The invention has the advantages of small volume of each part, high integration level, no need of adding other devices, convenient arrangement, low cost and easy popularization and application.
The invention is described in further detail below with reference to the drawings and the specific embodiments.
Drawings
FIG. 1 is a schematic diagram of a urea concentration sensor device according to the present invention.
FIG. 2 is a cross-sectional view of one of the structural schematic diagrams of the urea concentration sensor apparatus provided by the present invention.
FIG. 3 is a schematic diagram showing an example of the structure of a urea concentration sensor device according to the present invention.
FIG. 4 is a second schematic diagram of the urea concentration sensor device according to the present invention.
FIG. 5 is a second schematic diagram of an application example of the urea concentration sensor device according to the present invention.
Detailed Description
The structure of the urea concentration sensor device provided by the invention is schematically shown in fig. 1, the urea concentration sensor device 1 comprises a sensor probe body 103, a probe lead 102 and a filter screen 100 with an internal cavity 100a, the probe body 103 comprises an opening 103b for liquid to enter and an opening 103a for internal gas to be discharged, the opening 103b for liquid to enter is generally arranged at the bottom, dirt precipitation is facilitated, signal interference is prevented, the opening 103a for gas to be discharged is arranged at the top, and the opening at the top is more than or equal to the opening at the lower part, so that bubbles are more facilitated to be discharged. The probe body 103 fits into the interior cavity 100a from the open end 104 of the filter mesh enclosure 100. The detection information generated by the probe body 103 of the urea concentration sensor is output by the probe lead 102, the filter screen 100 further comprises an exhaust bubble connection nozzle 101 communicated with the internal cavity 100a, and the exhaust bubble connection nozzle 101 is positioned at the upper position of the filter screen 100, so that internal bubbles are smoothly discharged.
The urea concentration sensor device is generally a cylinder, and the cross-sectional schematic view of the device is shown in fig. 2, and comprises a skeleton 150 supporting mesh cloth and a filtering screen surface 151. The filter screen faces are obliquely arranged, dirt is facilitated to fall off, and surface meshes are guaranteed not to be blocked.
As shown in fig. 3, one of the structural schematic diagrams of the application example of the urea concentration sensor device provided by the present invention is that a plastic cover 200, a bracket 201, a liquid storage tank 203, a urea pump 202, a primary filter 100a arranged at a liquid inlet 202a, a urea liquid delivery pipe 204 connecting the urea pump 202 and the plastic cover 200, and sensors fixed on the bracket 201, including the urea concentration sensor device 1, a temperature sensor 206 and a liquid level sensor 207. The bracket 201 is a stainless steel connecting frame, the urea pump 202 can be placed vertically or horizontally through the bracket 201 and is arranged at one end of the bracket 201, the plastic cover 200 is fixed at the other end of the bracket 201, the urea pump 202 penetrates into the bottom of the liquid storage tank 203 through the bracket 201, and is arranged on the liquid storage tank 203 through the plastic cover 200.
The urea concentration sensor apparatus is shown in fig. 4, the primary screen 100a is integrated with the screen cover 100, and the rear end portion thereof includes an extension block 250 with a mounting opening 251, and the extension block 250 communicates with the inner chamber 100a. The inlet 202a of the urea pump 202 is secured to the mounting 251 of the extension block 250 and sealed by mating. The urea liquid filtered by the first-stage filter screen 100a enters the urea pump 202 from the extension block 250 of the filter screen 100, and forms high-pressure injection solution to be output through the urea liquid conveying pipe 204 and the plastic cover 200, wherein the urea liquid conveying pipe 204 is made of metal or high polymer materials, can be a shaped rigid pipe or a bendable flexible pipe, and is convenient to install and arrange and ensures stable conveying of the high-pressure liquid. The urea concentration sensor device 1 is fixed to the holder 201 by a clip 205.
The bubble discharge nozzle 101 of the filter screen 100 comprises an outer bubble discharge pipe 101a, one end of the outer bubble discharge pipe 101a is connected with the bubble discharge nozzle 101, and the outlet 101b at the other end of the outer bubble discharge pipe is communicated with the space above the liquid surface, so that the gas in the filter screen 100 can be smoothly discharged. The bubble discharge tube 101a is fixed to the holder 201, and the duct outlet 101b includes a bend (not shown) that does not interfere with the discharge of bubbles, or a screen cover 208 that prevents dirt from entering from the mouth end 101 b. The bubble vial 101a and the bubble nozzle 101 may be formed as a single body, and the outlet thereof may be opened to the gas space above the liquid surface.
The support 201 may be a loop formed by a heating pipe, the ice-melting liquid passing through the heating pipe is engine coolant, and the inlet and outlet 209 of the cooling pipe is disposed on the plastic cover 200. The circuitry of the level sensor 207 and the temperature sensor 206 are enclosed in the same conduit 206a, which conduit 206a may be a plastic tube, arranged up and down the heating tube loop 201. The lead 102 of the urea concentration sensor device 1 is likewise arranged along the heating line 201. The urea solubility sensor device 1 and the other working components within the reservoir 203 are arranged around the stand 201 in a manner that facilitates ice melting. When the ambient temperature is lower than-11 ℃, the urea solution is frozen, at this time, after the engine (not shown in the figure) is started, cooling liquid is introduced into the heating pipe, and when the temperature of the cooling liquid rises, and under the condition that the urea pump 202 is built in, the urea pump 202 can work with safe current to perform self-heating when judging that the liquid DEF reaches a certain amount. The urea concentration sensor device 1 and the urea pump 202 are arranged near the bottom of the liquid storage tank 203, and ice melting benefits from the heating pipe 201 and the urea pump 202 to do work.
The urea pump 202 is a pulse driven pump controlled by a control unit 210. The control unit 210 may optionally be arranged on a plastic cover, outside the reservoir 203. The control unit 210 obtains the corresponding driving pulse number by receiving the demand information of the vehicle on the injection quantity and according to the pre-stored characteristic parameters of the urea pump. Meanwhile, the control unit 210 judges whether the current state meets the injection condition according to the information of the temperature, the liquid level and the concentration of the urea solution in the liquid storage tank, if the current state does not meet the injection condition, the control unit sends corresponding alarm information through the CAN bus, and if the current state does not meet the injection condition, the control unit sends a driving signal to the urea pump 202 and sends information about the state of the urea pump 202 through the CAN bus.
FIG. 5 is a second schematic diagram of the urea concentration sensor device according to the present invention, which is different from one of the first schematic diagrams of the urea concentration sensor device according to the present invention: comprising a secondary filter 301 arranged on the plastic cap 200, said secondary filter 301 being located upstream of the urea outlet nozzle 302, comprising a cavity 304 with a threaded cap 303, and an internal filter element 305 arranged inside the cavity 304. The cavity 304 is communicated with the urea solution conveying pipe 204, and urea solution is filtered by the filter element 305 and then is output. The filter element 305 can be replaced periodically with a higher filtering precision than the primary filter screen 32 to ensure proper operation of the downstream metering nozzle 11 and to increase the service life of the system. The filtering net cover 306 and the secondary filtering net 301 of the urea concentration sensor device are integrally arranged, the sensor probe body 103 is arranged in the inner filtering core 305, the probe body 103 tests urea liquid in the urea liquid conveying pipe 204, and the urea solution is filtered by the two-stage filtering nets (100 a and 301) to further reduce influence factors of a sensor (not shown in the figure) of the urea concentration sensor probe body 103, so that the accuracy of a test result is improved.
The above examples are only for illustrating the essence of the present invention, but do not limit the present invention. Any modifications, simplifications, etc., which do not depart from the principles of the invention, are intended to be included within the scope of the invention.
The invention is not related in part to the same as or can be practiced with the prior art.
Claims (4)
1. The urea concentration sensor device comprises a sensor package, and is characterized by comprising a filter screen, wherein the filter screen comprises an inner cavity, a mesh and a framework, the mesh is obliquely arranged, the sensor package stretches into the inner cavity and detects urea solution filtered by the mesh to remove the influence of impurities on signals, the sensor package comprises an opening for liquid to enter and an opening for internal gas to be discharged, the opening for liquid to enter is arranged at the bottom, the opening for gas to be discharged is arranged at the top, and the top opening is more than or equal to the lower opening; comprises an exhaust foam nozzle communicated with the internal cavity of the filter screen cover, wherein the exhaust foam nozzle is arranged at the top of the filter screen cover; the exhaust bubble nozzle comprises an extension, the outlet of which opens into the gas space above the liquid surface.
2. An SCR module provided with the urea concentration sensor device of claim 1, wherein the SCR module comprises a liquid storage tank, a urea pump, a bracket for melting ice, a plastic cover with a urea liquid outlet nozzle, and a control unit, the bracket is fixed on the liquid storage tank, the internal circulation flows the engine cooling liquid to realize the ice melting of the device, the plastic cover and the urea pump are respectively arranged at two ends of the bracket, and the urea pump penetrates into the bottom of the liquid storage tank through the bracket.
3. An SCR module as claimed in claim 2, wherein the urea concentration sensor means is secured to the support in a manner which facilitates ice melting as the support extends into the vicinity of the bottom of the reservoir.
4. The SCR module of claim 3, wherein the primary screen is disposed at a liquid inlet of the urea pump, and the filter screen is a screen of the primary screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910892155.3A CN112539098B (en) | 2019-09-20 | 2019-09-20 | Urea concentration sensor device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910892155.3A CN112539098B (en) | 2019-09-20 | 2019-09-20 | Urea concentration sensor device |
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| Publication Number | Publication Date |
|---|---|
| CN112539098A CN112539098A (en) | 2021-03-23 |
| CN112539098B true CN112539098B (en) | 2024-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910892155.3A Active CN112539098B (en) | 2019-09-20 | 2019-09-20 | Urea concentration sensor device |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114441630A (en) * | 2022-03-04 | 2022-05-06 | 湖北晟正汽车零部件有限公司 | Anti-bubble-interference ultrasonic probe for urea sensor |
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| JP2005299441A (en) * | 2004-04-08 | 2005-10-27 | Hino Motors Ltd | Urea water storage device |
| CN103201473A (en) * | 2011-05-16 | 2013-07-10 | 苏州派格丽减排系统有限公司 | Integrated scr reducing agent storage device |
| KR101596410B1 (en) * | 2014-08-19 | 2016-02-23 | 주식회사 화영 | Urea water sender including urea concentration measuring device and urea water tank including the same |
| WO2016085307A1 (en) * | 2014-11-27 | 2016-06-02 | 두산인프라코어 주식회사 | Urea concentration measurement device, and urea water sender and urea water tank having same |
| CN107191252A (en) * | 2017-07-13 | 2017-09-22 | 广西玉柴机器股份有限公司 | Integrated form urea tank |
| CN211819599U (en) * | 2019-09-20 | 2020-10-30 | 福爱电子(贵州)有限公司 | Urea concentration sensor device and application module thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9377441B2 (en) * | 2013-10-02 | 2016-06-28 | Ssi Technologies, Inc. | Reduction of aeration interference in an ultrasonic fluid sensing system |
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2019
- 2019-09-20 CN CN201910892155.3A patent/CN112539098B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004317288A (en) * | 2003-04-16 | 2004-11-11 | Kyoto Electron Mfg Co Ltd | Ultrasonic acoustic velocity measuring device |
| JP2005299441A (en) * | 2004-04-08 | 2005-10-27 | Hino Motors Ltd | Urea water storage device |
| CN103201473A (en) * | 2011-05-16 | 2013-07-10 | 苏州派格丽减排系统有限公司 | Integrated scr reducing agent storage device |
| KR101596410B1 (en) * | 2014-08-19 | 2016-02-23 | 주식회사 화영 | Urea water sender including urea concentration measuring device and urea water tank including the same |
| WO2016085307A1 (en) * | 2014-11-27 | 2016-06-02 | 두산인프라코어 주식회사 | Urea concentration measurement device, and urea water sender and urea water tank having same |
| CN107191252A (en) * | 2017-07-13 | 2017-09-22 | 广西玉柴机器股份有限公司 | Integrated form urea tank |
| CN211819599U (en) * | 2019-09-20 | 2020-10-30 | 福爱电子(贵州)有限公司 | Urea concentration sensor device and application module thereof |
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