CN108301906B - Air pressurization infiltration belt cleaning device - Google Patents

Air pressurization infiltration belt cleaning device Download PDF

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Publication number
CN108301906B
CN108301906B CN201810236878.3A CN201810236878A CN108301906B CN 108301906 B CN108301906 B CN 108301906B CN 201810236878 A CN201810236878 A CN 201810236878A CN 108301906 B CN108301906 B CN 108301906B
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urea
air
piston
pipe
cavity
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CN108301906A (en
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李平
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LOTUSFAIRY POWER TECHNOLOGIES CORP
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LOTUSFAIRY POWER TECHNOLOGIES CORP
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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
    • F01N3/24—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 constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/06—Polyethene
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/011—Nanostructured additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
    • C08L2205/16—Fibres; Fibrils
    • 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
    • F01N2610/1406—Storage means for substances, e.g. tanks or reservoirs

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

Abstract

The invention discloses an air pressurization infiltration cleaning device, comprising: one end of the first air pipe is connected with a compressed air source, and the other end of the first air pipe is a spraying end; a urea tank; the pressure container is arranged in the urea box, a water seepage module is arranged in the pressure container to divide the pressure container into an upper cavity and a lower cavity, a first piston is arranged in the upper cavity, a second piston is arranged in the lower cavity, the first piston and the second piston are connected through a driving shaft, a urea cavity is formed between the first piston and the water seepage module, and a water seepage cavity is formed between the second piston and the water seepage module; and a driving spring provided at a lower portion of the second piston. The invention can dilute and clean the residual urea in the urea transportation channel and prevent the pipeline from being blocked.

Description

Air pressurization infiltration belt cleaning device
Technical Field
The invention relates to the field of diesel engine tail gas purification post-treatment. More particularly, the present invention relates to an air pressurized water seepage cleaning device.
Background
At present, a small amount of urea aqueous solution is added into an engine exhaust pipe, urea is decomposed into ammonia at high temperature, and the ammonia reacts with nitrogen oxides with the help of an SCR catalyst to generate nitrogen and water. Generally, diesel vehicle urea is an aqueous urea solution with a concentration of 32.5% (i.e., the eutectic point of urea and water).
The urea transfer channel inside the urea pump from the pump to the urea nozzle has the possibility of residual urea due to uncleanness after the urea pump stops running. As shown in fig. 1, urea is most likely to form urea residues where urea meets air and accumulates, eventually leading to clogging. In fact, the blockage of residual urea crystals in urea pumps is a worldwide problem today, and is also a very common problem.
Disclosure of Invention
The invention aims to provide an air pressurization infiltration cleaning device, which utilizes the pressure generated by compressed air and a permeable membrane to infiltrate water from urea aqueous solution to produce pure water or urea aqueous solution with concentration far lower than that of urea solution in a urea tank so as to dilute and clean residual urea in a urea transportation channel.
To achieve these objects and other advantages and in accordance with the purpose of the invention, there is provided an air pressurized water seepage cleaning device including:
one end of the first air pipe is connected with a compressed air source, and the other end of the first air pipe is a spraying end;
a urea tank;
the pressure container is arranged in the urea box, a water seepage module is arranged in the pressure container to divide the pressure container into an upper cavity and a lower cavity, a first piston is arranged in the upper cavity, a second piston is arranged in the lower cavity, the first piston and the second piston are connected through a driving shaft, a urea cavity is formed between the first piston and the water seepage module, and a water seepage cavity is formed between the second piston and the water seepage module;
a drive spring provided at a lower portion of the second piston;
the upper part of the pressure vessel is communicated with the first air pipe through the second air pipe, the urea cavity is provided with a first opening and is communicated with the urea box through a first one-way valve, and the water seepage cavity is provided with a second opening and is communicated with the first air pipe through a second one-way valve and a water pipe.
Preferably, the urea tank further comprises a urea pump, wherein the urea pump is arranged in the urea tank and is communicated with the first air pipe through a urea pipe.
Preferably, the number of the first check valves is at least one.
Preferably, the first air pipe is communicated with the second air pipe, the water pipe and the urea pipe in sequence along the gas injection direction in the first air pipe.
Preferably, the method further comprises:
the air pressure regulating valve is arranged on the first air pipe and is positioned between the second air pipe and the water pipe;
an air switching valve is provided on the first air tube adjacent to the compressed air source.
Preferably, the urea tank is made of a first material, wherein the first material comprises the following raw materials in parts by weight: 100 parts by weight of polyethylene with the density of 0.92-0.94, 10-12 parts by weight of first auxiliary agent and 5-8 parts by weight of second auxiliary agent;
the first auxiliary agent is prepared from ferrocene and polyamide resin according to a mass ratio of 1:5;
the second auxiliary agent is ginger oleoresin, sisal fiber and nano silicon dioxide according to the mass ratio of 2:1:7;
the preparation method of the first material comprises the following steps:
step one, placing a second auxiliary agent into a mixer, controlling the rotating speed to be 80 revolutions per minute, and stirring for 15 minutes;
granulating the first auxiliary agent, the polyethylene and the second auxiliary agent, controlling the rotating speed to be 400 revolutions per minute, controlling the temperature to be 130-140 ℃ and controlling the pressure of a machine head to be 0.1MPa;
and thirdly, grinding the particles in a pulverizer, wherein the feeding speed is controlled to be 200kg/h, the rotating speed of a grinding disc is 2000 rpm, and the outlet temperature of the grinding disc is 45 ℃.
The invention at least comprises the following beneficial effects:
the invention utilizes the pressure generated by compressed air and the water seepage module to separate urea and water in the pressure container, and then utilizes the water collected by the water seepage cavity to quickly enter the spraying end of the first air pipe under the action of the pressure to dilute and clean the residual urea aqueous solution, thereby saving water resources, realizing the secondary utilization of the water resources, saving energy and protecting environment, and being capable of automatically cleaning the spraying end of the first air pipe and the residual urea aqueous solution in the joint of the urea pipe in time and avoiding the crystallization blockage of urea in the pipeline.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a typical structure within a prior art urea tank;
fig. 2 is a schematic structural view of an air pressurized water seepage cleaning device according to an embodiment of the present invention.
100-pressure vessel, 110-second air pipe, 200-infiltration module, 210-first piston, 220-second piston, 230-urea chamber, 231-infiltration chamber, 240-drive shaft, 250-drive spring, 270-first check valve, 280-second check valve, 290-water pipe, 300-first air pipe, 400-urea pump, 410-urea pipe, 600-air pressure regulating valve, 700-air switching valve, 900-urea tank.
Detailed Description
The present invention is described in further detail below with reference to the drawings to enable those skilled in the art to practice the invention by referring to the description.
It should be noted that the experimental methods described in the following embodiments, unless otherwise specified, are all conventional methods, and the reagents and materials, unless otherwise specified, are all commercially available; in the description of the present invention, the terms "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus are not to be construed as limiting the present invention.
Example 1
As shown in fig. 2, the air pressurized water seepage cleaning device provided by the invention comprises:
the first air tube 300 has one end connected to a compressed air source and the other end provided with an injection end having a nozzle through which the engine exhaust pipe is injected.
Urea tank 900 for holding urea solution.
The pressure vessel 100 is disposed in the urea tank 900, a water seepage module 200 is disposed in the pressure vessel 100 to divide the pressure vessel 100 into an upper chamber and a lower chamber, a first piston 210 is disposed in the upper chamber, a second piston 220 is disposed in the lower chamber, the first piston 210 and the second piston 220 are connected by a driving shaft 240, a urea cavity 230 is formed between the first piston 210 and the water seepage module 200, and a water seepage cavity 231 is formed between the second piston 220 and the water seepage module 200. Preferably, the water seepage module 200 is made of at least one type of seepage membrane, and water molecules in urea can permeate through the seepage membrane to the other side of the membrane under a certain pressure, and the seepage speed is generally related to factors such as the material of the seepage membrane, the pressure, the area of the seepage membrane and the like, and can be designed to be a required seepage speed. In some cases, small amounts of urea molecules will also permeate along with water molecules, and the concentration of urea permeated should be much less than the concentration of urea in urea tank 900.
And a driving spring 250 provided at a lower portion of the second piston 220, and connected at the other end to the bottom of the pressure vessel 100.
The upper part of the pressure vessel 100 is communicated with the first air pipe 300 through the second air pipe 110, the urea chamber 230 is provided with a first opening and is communicated with the urea tank 900 through the first check valve 270, and the water seepage chamber 231 is provided with a second opening and is communicated with the first air pipe 300 through the second check valve 280 and the water pipe 290.
In the above-described solution, the pressure vessel 100 and other components are provided in the urea tank 900 and connected to the first air pipe 300, so that the residual urea can be dissolved, diluted and washed without accumulation when the urea pump 400 stops operating.
In another embodiment, the urea pump 400 is disposed in the urea tank 900, and the urea pump 400 communicates with the first air pipe 300 through a urea pipe 410.
In another embodiment, the number of the first check valves 270 is at least one, and in this embodiment, two are shown.
In another embodiment, the first air tube 300 is sequentially connected to the second air tube 110, the water tube 290 and the urea tube 410 along the direction of the gas injection in the first air tube 300.
In another technical scheme, the method further comprises the following steps:
an air pressure regulating valve 600 provided on the first air tube 300 and located between the second air tube 110 and the water tube 290;
an air switching valve 700 provided on the first air tube 300 adjacent to the compressed air source.
The working flow of the air pressurization infiltration belt cleaning device is as follows: in normal operation of the system, the air switch valve 700 is opened under the control of the aftertreatment system controller (DCU, not shown), a jet of compressed air (assist air) flows to the nozzle after the pressure is regulated by the air pressure regulating valve 600, the urea pump 400 pumps urea to the urea pipe 410 under the control of the DCU to be combined with the air in the first air pipe 300, then the urea is carried to the nozzle by the compressed air to be sprayed into the exhaust pipe of the engine, and meanwhile, the other jet of compressed air flows into the top of the pressure vessel 100 through the second air pipe 110 to drive the first piston 210 to drive the second piston 220 to move downwards simultaneously, the urea Shi Jiatong in the urea cavity 230 is equal to the pressure of the compressed air, and the first one-way valve 270 is closed under the driving of the pressure, so that water molecules in the urea solution in the urea cavity 230 penetrate into the water penetration cavity 231 through the water penetration module 200. At this time, the driving spring 250 in the pressure vessel 100 is also compressed, and the second check valve 280 is also closed by the air pressure in the first air tube 300 and the negative pressure generated by the downward movement of the second piston 220. The above-described water seepage process continues until the piston moves to the bottom dead center, or the spring is compressed to the position of equilibrium with the air pressure, at which time the water seepage chamber 231 is full of water.
When the engine is shut down, the DCU controls the air valve air switch valve 700 to be closed, so that the air source is cut off, the urea pump 400 stops pumping urea, the pressure in the first air pipe 300 is released, the second piston 220 drives the first piston 210 to move upwards together under the driving of the driving spring 250, the water in the water seepage cavity 231 extrudes the second one-way valve 280 to flow to the injection end of the first air pipe 300 through the water pipe 290 under the driving of the second piston 220, and urea injection positions, particularly urea at the junction of urea and air (namely the junction of the first air pipe 300 and the urea pipe 410) are dissolved and diluted. After the water is emptied from the permeate chamber 231, the DCU opens the air switch valve 700 for a period of time, such as about 1 minute, to allow air to purge the spray tube of water and residual urea. After the cleaning process described above is completed, the DCU again closes the air switch valve 700 and closes the entire aftertreatment controller system.
After the aftertreatment controller system is shut down, the internal and external pressures of the urea chamber 230 are removed, the first piston 210 is maintained at the highest position under the drive of the drive spring 250, the first check valve 270 is opened, and when the engine is shut down, for example, at night, the urea solution in and out of the urea chamber 230 is exchanged for a sufficient time so that the urea solution concentration in the urea chamber 230 returns to be consistent with the urea solution concentration in the urea tank 900, ready for the next aftertreatment system start-up.
Example 2
The urea box in the air pressurization infiltration belt cleaning device adopts the first material to make, adds the mould in the urea box with first material and rotational moulding shaping.
The urea box is made of a first material, and the first material comprises the following raw materials in parts by weight: 100 parts by weight of polyethylene with a density of 0.93, 10 parts of a first auxiliary agent and 5 parts of a second auxiliary agent.
The first auxiliary agent is prepared from ferrocene and polyamide resin according to a mass ratio of 1:5.
The second auxiliary agent is ginger oleoresin, sisal fiber and nano silicon dioxide according to the mass ratio of 2:1:7.
The preparation method of the first material comprises the following steps:
step one, placing a second auxiliary agent into a mixer, controlling the rotating speed to be 80 revolutions per minute, and stirring for 15 minutes;
granulating the first auxiliary agent, the polyethylene and the second auxiliary agent, controlling the rotating speed to be 400 revolutions per minute, controlling the temperature to be 130-140 ℃ and controlling the pressure of a machine head to be 0.1MPa;
and thirdly, grinding the particles in a pulverizer, wherein the feeding speed is controlled to be 200kg/h, the rotating speed of a grinding disc is 2000 rpm, and the outlet temperature of the grinding disc is 45 ℃.
The urea tank in example 2 was subjected to the relevant test: the urea box and the metal insert are well bonded, and the problem of cavities does not occur. After 4 hours at low temperature (-40 ℃), no cracking occurred by impact strength testing. After 4 hours at normal temperature (23 ℃), the impact strength was 25J/mm.
The urea box was cut into 12.7X12.7mm test pieces and tested for impact strength, all using the requirements of American rotomoulding society standard version 4.0.
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the invention would be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.

Claims (6)

1. Air pressurization infiltration belt cleaning device, its characterized in that includes:
one end of the first air pipe is connected with a compressed air source, and the other end of the first air pipe is a spraying end;
a urea tank;
the pressure container is arranged in the urea box, a water seepage module is arranged in the pressure container to divide the pressure container into an upper cavity and a lower cavity, a first piston is arranged in the upper cavity, a second piston is arranged in the lower cavity, the first piston and the second piston are connected through a driving shaft, a urea cavity is formed between the first piston and the water seepage module, and a water seepage cavity is formed between the second piston and the water seepage module;
a drive spring provided at a lower portion of the second piston;
the upper part of the pressure vessel is communicated with the first air pipe through the second air pipe, the urea cavity is provided with a first opening and is communicated with the urea box through a first one-way valve, and the water seepage cavity is provided with a second opening and is communicated with the first air pipe through a second one-way valve and a water pipe.
2. The air pressurized, water permeable cleaning device according to claim 1, further comprising a urea pump disposed in said urea tank, said urea pump being in communication with said first air tube via a urea tube.
3. The air pressurized, water permeable cleaning device according to claim 1, wherein the number of said first one-way valves is at least one.
4. An air pressurized-water seepage cleaning device according to claim 2, wherein the first air pipe is communicated with the second air pipe, the water pipe and the urea pipe in sequence along the air injection direction in the first air pipe.
5. The air pressurized, water permeable cleaning device according to claim 4, further comprising:
the air pressure regulating valve is arranged on the first air pipe and is positioned between the second air pipe and the water pipe;
an air switching valve is provided on the first air tube adjacent to the compressed air source.
6. The air pressurized, water permeable cleaning device according to claim 1, wherein said urea tank is made of a first material comprising the following raw materials in parts by weight: 100 parts by weight of polyethylene with the density of 0.92-0.94, 10-12 parts by weight of first auxiliary agent and 5-8 parts by weight of second auxiliary agent;
the first auxiliary agent is prepared from ferrocene and polyamide resin according to a mass ratio of 1:5;
the second auxiliary agent is ginger oleoresin, sisal fiber and nano silicon dioxide according to the mass ratio of 2:1:7;
the preparation method of the first material comprises the following steps:
step one, placing a second auxiliary agent into a mixer, controlling the rotating speed to be 80 revolutions per minute, and stirring for 15 minutes;
granulating the first auxiliary agent, the polyethylene and the second auxiliary agent, controlling the rotating speed to be 400 revolutions per minute, controlling the temperature to be 130-140 ℃ and controlling the pressure of a machine head to be 0.1MPa;
and thirdly, grinding the particles in a pulverizer, wherein the feeding speed is controlled to be 200kg/h, the rotating speed of a grinding disc is 2000 rpm, and the outlet temperature of the grinding disc is 45 ℃.
CN201810236878.3A 2018-03-21 2018-03-21 Air pressurization infiltration belt cleaning device Active CN108301906B (en)

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JP7241639B2 (en) * 2018-09-03 2023-03-17 日立造船株式会社 Internal combustion engine and control system
CN110439656B (en) * 2019-08-20 2020-06-05 安徽江淮汽车集团股份有限公司 Urea crystal dissolving and removing device

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CN101203664B (en) * 2005-04-13 2010-12-01 格兰富Nonox公司 A mixing device for mixing urea and air
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CN103189608A (en) * 2010-11-12 2013-07-03 考特克斯·特克斯罗恩有限公司及两合公司 Liquid reservoir, in particular for an aqueous urea solution
CN104632326A (en) * 2013-11-08 2015-05-20 武汉洛特福动力技术有限公司 Reactant metering and delivering device for internal combustion engine tail gas purification and aftertreatment system
CN105829154A (en) * 2013-12-19 2016-08-03 伊顿公司 Fill limit vent valve having vapor permeable membrane
JP2016128678A (en) * 2015-01-09 2016-07-14 いすゞ自動車株式会社 Urea injection device
CN107060964A (en) * 2017-06-20 2017-08-18 山东艾泰克环保科技股份有限公司 A kind of urea box observes device with new construction
CN208153112U (en) * 2018-03-21 2018-11-27 武汉洛特福动力技术有限公司 Air pressurized infiltration cleaning device

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