CN110905633A - Urea liquid supply module - Google Patents
Urea liquid supply module Download PDFInfo
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- CN110905633A CN110905633A CN201811074747.6A CN201811074747A CN110905633A CN 110905633 A CN110905633 A CN 110905633A CN 201811074747 A CN201811074747 A CN 201811074747A CN 110905633 A CN110905633 A CN 110905633A
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- pipe
- module body
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 200
- 239000004202 carbamide Substances 0.000 title claims abstract description 200
- 239000007788 liquid Substances 0.000 title claims abstract description 153
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 54
- 238000010438 heat treatment Methods 0.000 claims abstract description 25
- 230000007306 turnover Effects 0.000 claims abstract 2
- 238000005086 pumping Methods 0.000 claims description 18
- 238000001914 filtration Methods 0.000 claims description 12
- 238000010257 thawing Methods 0.000 claims description 11
- 238000004140 cleaning Methods 0.000 claims description 9
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 238000007710 freezing Methods 0.000 claims description 3
- 230000008014 freezing Effects 0.000 claims description 3
- 230000009172 bursting Effects 0.000 claims description 2
- 239000000243 solution Substances 0.000 description 34
- 238000002347 injection Methods 0.000 description 17
- 239000007924 injection Substances 0.000 description 17
- 238000010586 diagram Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 6
- 238000009434 installation Methods 0.000 description 6
- 238000007789 sealing Methods 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 3
- 238000010531 catalytic reduction reaction Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 230000002000 scavenging effect Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000010420 art technique Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Images
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]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1426—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
- F01N2610/1433—Pumps
-
- 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
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (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
The utility model provides a module is supplied with to urea liquid, includes that a urea feed pump, module body, urea liquid level sensor, urea liquid temperature sensor, urea liquid quality sensor, urea liquid heating unfreeze circulating water pipe, a serial communication port, urea liquid feed pump and urea liquid quality sensor are located the bottom of module, fix on the urea liquid heating unfreeze circulating water pipe, urea liquid play liquid spigot joint and the liquid spigot joint that returns have been set up on the module body, and heating unfreeze circulating water pipe business turn over water spigot joint to and insert the buckle of urea case back erection fixation in urea case with the module from urea case upper portion.
Description
Technical Field
The invention belongs to the field of engine emission control, and particularly relates to a urea liquid supply metering system of an engine exhaust selective reduction (SCR) technology.
Background
With the increasing prominence of environmental problems, energy conservation and emission reduction become the endless requirements of vehicles and engines, and therefore, various countries have a series of vehicle emission standards and become stricter. In this regard, internal combustion engine powered vehicles require the installation of an exhaust after-treatment system in order to meet the emission requirements. For example, scr (selective Catalytic reduction) technology, which is mainly used for Catalytic treatment of pollutants such as NOx in exhaust gas of diesel engines, has become an essential technology for diesel vehicles and the like.
SCR technology requires dosing of a NOx reducing reagent into the Diesel Exhaust, which has a 32.5% by weight aqueous urea solution (also called Diesel Exhaust Fluid DEF = Diesel Exhaust Fluid, or additive blue AdBlue), or ammonia gas. In the SCR exhaust gas catalytic treatment process, DEF treatment liquid is injected quantitatively into diesel engine exhaust gas, decomposed into ammonia gas by the exhaust gas at high temperature, mixed with the exhaust gas, and then introduced into an SCR catalytic converter, and the ammonia gas and NOx in engine exhaust gas undergo catalytic reduction reaction under the action of a catalyst, so that NOx is decomposed into harmless N2 and H2O. If the injection amount of DEF is not matched with the NOx content in the exhaust gas or the quality of the urea solution cannot meet the requirement, either NOx cannot be sufficiently reduced and decomposed, the emission amount increases, or a large amount of residual ammonia gas is discharged into the atmosphere, causing secondary pollution.
However, the quality of the urea aqueous solution as an important reactant is often controlled only at the time of shipment or inspection, and most of the post-treatment systems are not provided with a device capable of detecting the quality of the urea aqueous solution. Now, in order to reduce the use cost, many vehicle users use inferior urea solution or add water solvent into the urea solution, which causes the urea solution to have uneven quality and seriously affects the treatment effect of the tail gas NOx, and the SCR is similar to the nominal SCR. Therefore, it is necessary to provide a sensor capable of detecting the quality of urea in the apparatus.
In addition, due to the characteristics of the urea aqueous solution, after the injection is finished, the urea mixed solution remained in the closed urea system and the pipeline is likely to freeze below the freezing point (-11-12 ℃) of the urea solution, which not only can cause the urea injection to be interrupted, but also can cause the urea injection system to be damaged due to the expansion of the urea solution during the freezing. In the existing SCR technology, an auxiliary heating device is mostly considered to be additionally arranged to ensure the normal work of a system. However, the existing devices for providing a source of injection power are too bulky or otherwise difficult to integrate system components into the DEF reservoir, often requiring complex design of ice melting devices, which makes the system more bulky and difficult to deploy, and at the same time, the more complex the system, the higher the cost. Especially for the built-in injection system of urea pump, the urea pump is arranged and is often pressed close to the bottom of the box, and self does not have the ability of unfreezing, needs the system of thoroughly unfreezing just can begin to work, leads to the system all to receive the restriction on unfreezing time and arrangement space. For example, US20090301067a1 discloses a metered spray device and method. The metering injection device is a solenoid-driven plunger pump nozzle arranged on an exhaust pipe, needs an additional low-pressure pump to provide working liquid for the metering injection device from a DEF (DEF) liquid storage tank, and cannot work normally without the assistance of a special ice melting and nozzle cooling device. In addition, the operation, system and method of SCR metered injection disclosed in US8356471B2 provides a pump-to-nozzle separately controlled scheme. In addition to the stringent requirements for temperature control of the apparatus and ice melting in the pipeline, the metering accuracy also needs to be precisely controlled.
It is essential for the whole urea injection device that a gas space is left at the top of the urea tank, which not only ensures the proper exhaust of the various actuators, but also ensures a sufficient expansion space of the urea tank itself when the urea solution freezes. The urea can not be accurately judged during filling, a pipeline communicated with the atmosphere is commonly additionally arranged in the conventional structure, but the dirt bearing capacity of the system is also influenced, a filtering device needs to be additionally arranged, and the complexity and the cost of the system are further increased.
In summary, the Selective Catalytic Reduction (SCR) technology is a very valuable research work, both in terms of simplified structure and application, and also in terms of accuracy and stability of its metered injection system.
Disclosure of Invention
The present invention is directed to solving the above problems, and an object of the present invention is to provide a urea solution supply module with simple structure, good adaptability, stable operation and low cost. The second purpose is to reasonably arrange a quality sensor to ensure the ideal exhaust treatment effect.
In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a module is supplied with to urea liquid, includes urea feed pump, measurement nozzle, module body, urea liquid level sensor, urea liquid temperature sensor, urea liquid quality sensor, the heating of urea liquid circulating water that unfreezes.
The module body is provided with a urea liquid outlet connector, a liquid return connector, an internal liquid outlet channel, a liquid return channel, a water inlet connector, a water outlet connector and a mounting buckle, wherein the mounting buckle is used for mounting and fixing the module after the module is inserted into the urea box from the upper part of the urea box.
The liquid feed pump includes inlet and liquid outlet, the inlet is provided with elementary filter screen, and urea solution gets into the feed pump after elementary filter screen filters under self action of gravity. And the primary filter screen is provided with vertical air exhaust bubble pipes, in addition, the middle position of the liquid supply pump is provided with a transverse air exhaust bubble pipe, and the two air exhaust bubble pipes are connected through a three-way connecting pipe and then led to the space above the bottom plane of the module installation buckle. The three-way part is provided with a part of primary filter screen, so that liquid can be fed into the urea supply pump through the part of primary filter screen unfrozen at the earliest time when the urea liquid is unfrozen after being frozen.
The liquid outlet of the urea pump is connected with a liquid outlet pipe, the liquid outlet pipe is a forming pipe and designed in a mode of being close to the heating and unfreezing circulating water pipe as far as possible, and the liquid outlet pipe extends into the interior of the module body and is communicated with the internal liquid outlet channel and leads to the liquid outlet connector. And a sealing gasket is arranged between the liquid outlet pipe and the liquid outlet channel for sealing and damping.
The metering nozzle includes feed liquor mouth and returns the liquid mouth, the feed liquor end with go out the liquid faucet and connect through a feed pipe, return the liquid end with it connects through a liquid return pipe to return the liquid faucet, returns liquid faucet other end intercommunication and returns the liquid passageway, and passes through it accesss to the certain degree of depth of urea incasement portion to return the liquid passageway.
The urea solution supply pump and the urea solution quality sensor are positioned at the bottom of the module and fixed on the urea solution heating and unfreezing circulating water pipe so as to be arranged in a mode of facilitating deicing. The urea liquid level sensor and the urea liquid temperature sensor are fixed through the module and extend into the urea box to be close to the position of the urea supply pump.
The module body further comprises trapezoid steps arranged in an annular axial direction, the installation buckle comprises a limiting hole matched with the steps of the module body and a through hole allowing the urea solution to pass through each pipeline of the module, the installation buckle is fixed on the module body in a tightly holding mode, and meanwhile, each pipeline and each sensor pipeline are limited and lead to the inside of the module body, and the stability of each installation part is guaranteed.
The module body is further provided with a secondary urea liquid filtering device, the secondary urea liquid filtering device is located at the upstream of the liquid outlet connector, the secondary urea liquid filtering device comprises a cavity with a threaded cover and used for replacing an internal filter element, and the filtering precision of the secondary urea liquid filtering device is higher than that of the primary filter screen so as to guarantee normal work of a downstream nozzle and prolong the service life of the system.
Further, the urea solution supply module comprises a pipeline residual urea solution treatment device, and an alternative scheme of the pipeline urea solution treatment device is as follows: the module body is provided with a urea pumping device which comprises a pumping valve and a pumping pipeline. The back-pumping pipeline comprises an injection cavity, a drainage channel which is communicated with the urea box by a certain depth, a liquid inlet channel and a liquid outlet channel. The back-pumping valve is a one-way valve which is opened by means of electromagnetic force, the injection cavity is a space which is beneficial to urea liquid to flow out of the drainage channel quickly when the back-pumping valve is in an open state, and meanwhile, the space is also beneficial to liquid in the liquid outlet channel to enter the drainage channel. The urea pumping device is connected in series with the internal liquid outlet channel through the liquid inlet channel and the liquid outlet channel, and urea liquid in the internal liquid outlet channel directly reaches the liquid outlet nozzle through the liquid inlet channel and the liquid outlet channel of the urea pumping device and is output in a normal spraying state. When the pipeline needs to be cleaned, the pumping-back valve is started, and the urea liquid enters the drainage channel through the liquid inlet channel at a certain speed, so that the injection cavity generates a certain vacuum degree, and most of the urea liquid in the liquid supply tube and the liquid return tube can be pumped back to the urea box.
Another alternative of the pipeline residual urea solution treatment device is as follows: the module body is provided with a urea cleaning device which comprises a diaphragm type air pump and a cleaning pipeline, the cleaning pipeline is provided with a one-way valve and communicated with the liquid outlet pipe in a one-way mode, the air pump is started to suck air from the urea box and pressurize to open the one-way valve when necessary, and most of urea liquid in the liquid supply pipe and the liquid return pipe can be pumped back to the urea box.
The further optimization design of the urea liquid supply module is that the module body is provided with a urea box communicated atmosphere pipeline and a nozzle. The urea case leads to atmospheric line one end and connects the mouth, and the other end stretches into the inside certain degree of depth of urea case, and its aim at prevents on the one hand that urea case filler from being higher than when the module body, the filling is excessive and leads to the urea liquid level to be higher than the settlement position, on the other hand for balanced urea incasement gas pressure.
In addition, the urea liquid heating unfreezing circulating water pipe can be designed into an L shape at the bottom, so that the urea pump and the urea liquid quality sensor are conveniently fixed at the same height position of the module, and the urea pump and the urea liquid quality sensor can be inserted into the bottommost part of the urea box through a module mounting hole of the urea box.
The module body further comprises an internal water inlet channel and an internal water outlet channel, and the heating and unfreezing circulating water pipe is communicated with the water inlet connector and the water outlet connector of the heating and unfreezing circulating water pipe through the internal water inlet channel and the internal water outlet channel of the module body. And gas spaces are arranged on the water inlet channel and the water outlet channel in the module body, so that the circulating water system is prevented from being burst when water is frozen.
The following technical solutions further define or optimize the present invention.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a urea solution supply module provided by the present invention.
Fig. 2 is a second schematic structural diagram of an embodiment of a urea solution supply module provided by the present invention.
Fig. 3 is a third schematic structural diagram of an embodiment of a urea solution supply module provided by the present invention.
FIG. 4 is a partial cross-sectional view of the internal water passageway of the module body provided by the present invention.
Detailed Description
The invention is further described below with reference to the figures and examples.
Fig. 1 shows a schematic structural diagram of a first embodiment of the present invention, in which the urea solution supply module includes a urea tank 13, a urea supply pump 12, a metering nozzle 11, a module body 10, a urea solution level sensor 43, a urea solution temperature sensor 44, a urea solution quality sensor 38, a urea solution heating/thawing circulation water pipe 45, and a urea cleaning device 14.
The module body 10 is provided with a urea liquid outlet nozzle 20, a liquid return nozzle 25, water inlet and outlet nozzles (46, 47) of the heating and thawing circulating water pipe 45, a secondary urea liquid filtering device 52 arranged at the upstream of the liquid outlet nozzle 20, and an installation buckle 16 for inserting the module 15 into the urea tank 13 from the upper part of the urea tank 13 and then fixing the module to the urea tank 13. In addition, the module body 10 itself includes an internal liquid outlet channel 57 and a liquid return channel 26, an internal water inlet and outlet channel (as shown in fig. 4, taking the liquid inlet channel 300 as an example), and a ring of axially arrayed trapezoidal steps 58. The mounting buckle 16 comprises a limiting hole 54a matched with a step 58 of the module body 10, a protrusion 54 matched with a mounting limiting step 59a of the urea tank 13 and a through hole 55 allowing each pipeline of the urea liquid supply module 15 to pass through, the mounting buckle 16 is fixed on the module body 10 in a holding manner, and simultaneously limits each pipeline and each sensor pipeline which lead to the inside of the body, so that the stability of each mounting component is ensured, and the module 15 is mounted in the urea tank mounting hole 59 through the protrusion 54.
The second-stage urea solution filtering device 52 is located upstream of the outlet nozzle 20 and comprises a chamber 52a with a threaded cap 52b, and an internal filter element 52 arranged inside the chamber 52 a. The cavity 52a is communicated with the internal liquid outlet channel 57, and the urea liquid is output after being filtered by the filter element 52. The filter element 52 can be replaced periodically, and the filtering precision is higher than that of the primary filter screen 32, so that the normal work of the downstream metering nozzle 11 is ensured, and the service life of the system is prolonged.
The liquid supply pump 12 comprises a liquid inlet 60 and a liquid outlet 29, the liquid inlet 60 is provided with a primary filter screen 32, and the urea solution enters the liquid supply pump 12 after being filtered by the primary filter screen 32 under the action of self gravity. The primary screen 32 is secured to the feed pump 12 by a snap 31, on which a vertical air bubble tube 33 is provided. In addition, a transverse exhaust bubble tube 30 is arranged in the middle of the supply pump 12, and two exhaust bubble tubes (30, 33) are connected through a three-way connecting tube 41 and then lead to an air gap space above the bottom plane of the module mounting buckle 16. The three-way connection pipe 41 is partially provided with a part of primary filter screen 41a, so that when the urea solution is thawed after being frozen, the urea solution can be fed into the urea supply pump 12 through the part of primary filter screen 41a which is thawed earliest.
The liquid outlet 29 is connected with the liquid outlet channel 57 inside the module body 10 through a liquid outlet pipe 28, the liquid outlet pipe 28 is a forming pipe and designed in a mode of being close to the heating and thawing circulating water pipe 45 as much as possible, a sealing gasket 56 is arranged between the liquid outlet pipe 28 and the liquid outlet channel 57 for sealing and shock absorption, and the liquid outlet channel 57 inside leads to the liquid outlet nozzle 20.
The urea solution supply pump 12 and the urea solution quality sensor 38 are located at the bottom of the module 15, and are fixed on the urea solution heating and thawing circulating water pipe 45 so as to be arranged in a mode of facilitating ice melting. Urea liquid heating unfreezing circulating water pipe 45 is a bottom L type pipe, includes the platform 34 of taking locating hole 35 between the L type pipe, is favorable to urea feed pump 12 and urea liquid quality sensor 38 to fix in module 15 same height position to can insert urea case 13 bottommost through the module mounting hole 59 of urea case 13. The quality sensor 38 includes a threaded hole 40a corresponding to the positioning hole 35 and a step 40 fixed to the platform 34 by the bolt 36. The urea level sensor 43 and urea temperature sensor 44 are fixed by the module 15 and extend into the urea tank 13 near the urea supply pump 12.
As shown in fig. 4, the heating and thawing circulating water pipe 45 is communicated with the water inlet and outlet connectors (46, 47) of the heating and thawing circulating water pipe through the water inlet and outlet channel (taking the water inlet channel 300 as an example) inside the module body 10. The gas space 301 is arranged on the water inlet channel 300 inside the module body 10, so that the water is prevented from bursting of the circulating water system when being frozen. The end part of the heating and thawing circulating water pipe 45 is provided with a water pipe sleeve 302 and a damping sleeve 304 for fixing and protecting the heating and thawing circulating water pipe 45, and the circulating water pipe 45 is sealed with the module body 10 through a sealing ring 303.
The urea scavenging device 14 comprises a diaphragm air pump 49 and a scavenging line 17. The module body 10 includes an air passage channel 48. The cleaning pipeline 17 comprises an inlet channel 49a and an outlet channel 51, and the inlet channel 49a leads to the upper gas space of the urea box 13 through the gas channel 48 of the module body 10. The air outlet channel 51 is provided with a one-way valve 50 and is communicated with the liquid outlet pipe 28 in a one-way mode. When necessary, the air pump 49 is started to suck air from the urea tank 13 and pressurize the one-way valve 50, and the pressurized air passes through the air inlet channel 49a, the liquid outlet pipe 28, the liquid supply pipe 21 and the liquid return pipe 22 in sequence and can draw most of the urea liquid in each pipeline back to the urea tank 13.
Fig. 2 is a schematic structural diagram of a second embodiment provided in the present invention, which is different from the schematic structural diagram of the first embodiment provided in the present invention in that: the module body 10 is provided with a urea pumping device 18, which comprises a pumping valve 100 and a pumping pipeline 18 a. The back-suction pipeline 18a includes an injection cavity 101, a drainage channel 104 leading into the urea tank 13 to a certain depth, an inlet channel 103 and an outlet channel 102. The back-suction valve 100 is a one-way valve that is opened by electromagnetic force, and the injection cavity 101 is a space that facilitates the urea liquid to flow back from the drainage channel 104 rapidly when the back-suction valve 100 is opened, and at the same time, facilitates the liquid from the outlet pipe 28 to enter the drainage channel 104. The urea pumping-back device 18 is connected in series with the internal liquid outlet channel 57 through the liquid inlet channel 103 and the liquid outlet channel 102, and when in a normal spraying state, the urea liquid in the internal liquid outlet channel 57 directly reaches the liquid outlet nozzle 20 through the liquid inlet channel (102) and the liquid outlet channel (103) of the urea pumping-back device 18 and then is output. When the pipeline needs to be cleaned, the back-pumping valve 100 is started, and the urea liquid enters the drainage channel 104 through the liquid inlet channel 103 at a certain speed, so that the injection cavity 101 generates a certain vacuum degree, and most of the urea liquid in the liquid supply pipe 21 and the liquid return pipe 22 is pumped back to the urea tank 13.
Under the structure of the embodiment, the extension section of the liquid return channel 26 inside the module is arranged in the upper gas space of the urea box 13, so that the back suction phenomenon in the pipeline is avoided during the back suction.
Fig. 3 is a schematic structural diagram of a third embodiment of the present invention, which is different from the schematic structural diagram of the first embodiment of the present invention in that: the module body 10 is provided with a urea box 13 communicated with an atmosphere pipeline 200 and a connector 201. The urea box 13 is connected with the connector 201 through one end of the atmosphere pipeline, and the other end of the atmosphere pipeline extends into the urea box 13 to a certain depth H, so that on one hand, when the filling port of the urea box 13 is higher than the module body 10, the urea liquid level is prevented from being higher than the set position due to excessive filling, and on the other hand, the urea box 13 is used for balancing the air pressure in the urea box 13. In this embodiment, the air inlet 49a of the cleaning device can be directly connected to the atmosphere to simplify the piping design.
The above examples are only for illustrating the essence of the present invention, but not for limiting the present invention. Any modifications, simplifications, or other alternatives made without departing from the principles of the invention are intended to be included within the scope of the invention.
The present invention is not concerned with parts which are the same as or can be implemented using prior art techniques.
Claims (10)
1. The utility model provides a module is supplied with to urea liquid, includes that a urea feed pump, module body, urea liquid level sensor, urea liquid temperature sensor, urea liquid quality sensor, urea liquid heating unfreeze circulating water pipe, its characterized in that, urea liquid feed pump and urea liquid quality sensor are located the bottom of module, fix on the urea liquid heating unfreeze circulating water pipe, urea liquid play liquid spigot joint and the liquid spigot joint that returns have been set up on the module body, and heating unfreeze circulating water pipe business turn over water spigot joint to and be used for the buckle of erection fixation in urea case after inserting urea case with the module from urea case upper portion.
2. The urea solution supply module according to claim 1, comprising a metering nozzle, wherein the metering nozzle comprises an inlet nozzle and an outlet nozzle, the inlet end is connected to the outlet nozzle through a supply pipe, and the outlet end is connected to the return nozzle through a return pipe.
3. The urea solution supply module according to claim 2, wherein the urea solution heating and thawing circulation water pipe is folded into an L shape at the bottom, so that the urea pump and the urea solution quality sensor can be conveniently fixed at the same height position of the module, and can be inserted into the bottommost part of the urea tank through a module mounting hole of the urea tank.
4. The urea solution supply module according to claim 3, wherein the inlet of the urea supply pump is provided with a primary filter screen, the upper part of the urea supply pump is provided with a liquid outlet, the middle part of the urea supply pump is provided with a transverse air exhaust bubble pipe, the primary filter screen is provided with a vertical air exhaust bubble pipe, the two air exhaust bubble pipes are connected through a three-way connecting pipe and then lead to the space above the bottom plane of the module mounting buckle, and the three-way part is provided with a part of the primary filter screen so that the urea supply pump can be supplied with liquid through the part of the primary filter screen which is unfrozen at the earliest when.
5. The urea solution supply module according to claim 4, wherein a secondary urea solution filtering device is arranged on the module body at the position upstream of the liquid outlet nozzle, and the filtering device is a replaceable filter element structure, and the filtering precision is higher than that of the primary filter screen.
6. A urea supply module according to claim 5, wherein the module body is provided with a urea pumping device comprising a pumping valve and a pumping line, the pumping line is connected to the outlet pipe, and when the pumping valve is activated, most of the urea in the supply pipe and the pumping line can be pumped back to the urea tank.
7. The urea solution supplying module as claimed in claim 5, wherein the module body is provided with a urea cleaning device, which comprises a diaphragm type air pump and a cleaning pipeline, the cleaning pipeline is provided with a one-way valve and is in one-way communication with the liquid outlet pipe, and when necessary, the air pump is started to suck air from the urea tank and pressurize the air to open the one-way valve, so that most of the urea solution in the liquid supply pipe and the liquid return pipe can be pumped back to the urea tank.
8. A urea supply module as claimed in claim 5, characterized in that the outlet of the urea pump is connected to an outlet pipe, which is a shaped pipe that runs as close as possible to the heating and thawing circulation water pipe until it enters the interior of the module body.
9. The urea solution supply module according to claim 5, wherein the heating/thawing circulation water pipe is connected to the water inlet/outlet connector through a water passage inside the module body, and a gas space is provided in the water passage inside the module body to prevent the water from bursting when freezing.
10. The urea solution supplying module according to claim 5, wherein the module body is provided with a urea tank atmospheric vent pipe and a connector, and the atmospheric vent pipe has a part which extends to a certain depth inside the urea tank, so that the urea solution level is prevented from being higher than the set position due to excessive filling when the urea tank filling port is higher than the module body.
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