CN108252777A - Pressure relief device in urea box - Google Patents
Pressure relief device in urea box Download PDFInfo
- Publication number
- CN108252777A CN108252777A CN201810236292.7A CN201810236292A CN108252777A CN 108252777 A CN108252777 A CN 108252777A CN 201810236292 A CN201810236292 A CN 201810236292A CN 108252777 A CN108252777 A CN 108252777A
- Authority
- CN
- China
- Prior art keywords
- urea
- pressure release
- pressure
- hollow cavity
- pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 181
- 239000004202 carbamide Substances 0.000 title claims abstract description 180
- 239000007788 liquid Substances 0.000 claims abstract description 55
- 239000007864 aqueous solution Substances 0.000 claims abstract description 20
- 239000011248 coating agent Substances 0.000 claims description 13
- 238000000576 coating method Methods 0.000 claims description 13
- 238000009736 wetting Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 10
- 239000010410 layer Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- 230000002269 spontaneous effect Effects 0.000 claims description 7
- 239000011810 insulating material Substances 0.000 claims description 6
- 239000011229 interlayer Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 239000013078 crystal Substances 0.000 abstract description 13
- 239000012530 fluid Substances 0.000 abstract description 8
- 230000000149 penetrating effect Effects 0.000 abstract description 3
- ZJHHPAUQMCHPRB-UHFFFAOYSA-N urea urea Chemical compound NC(N)=O.NC(N)=O ZJHHPAUQMCHPRB-UHFFFAOYSA-N 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 13
- 238000002425 crystallisation Methods 0.000 description 11
- 230000008025 crystallization Effects 0.000 description 11
- 230000000694 effects Effects 0.000 description 10
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000002918 waste heat Substances 0.000 description 5
- 239000007789 gas Substances 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000000080 wetting agent Substances 0.000 description 2
- PXFBZOLANLWPMH-UHFFFAOYSA-N 16-Epiaffinine Natural products C1C(C2=CC=CC=C2N2)=C2C(=O)CC2C(=CC)CN(C)C1C2CO PXFBZOLANLWPMH-UHFFFAOYSA-N 0.000 description 1
- 208000033999 Device damage Diseases 0.000 description 1
- 229920001807 Urea-formaldehyde Polymers 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000004087 circulation Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000004089 microcirculation Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- WTHDKMILWLGDKL-UHFFFAOYSA-N urea;hydrate Chemical compound O.NC(N)=O WTHDKMILWLGDKL-UHFFFAOYSA-N 0.000 description 1
- 210000002700 urine Anatomy 0.000 description 1
Classifications
-
- 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
-
- 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
- F01N2610/1473—Overflow or return means for the substances, e.g. conduits or valves for the return path
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- 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)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses pressure relief device in urea box, urea box bottom is provided with urea pump, is internally provided with aqueous solution of urea, including：An at least pressure release pipe, its radial adiabatic and internal diameter is tiny, the pressure release pipe lower end is sealingly fastened on the urea pump, upper end protrudes from pressure release and manages the part outside outer urea liquid level and protruded with the spout hole outside perforation vertically, and the lower part that close urea pump is managed in the pressure release is provided with the hole for penetrating through aqueous solution of urea.Urea never crystal region is overflowed to discharge fluid pressure by the present invention using an at least slender pipeline with certain heat insulating function, it avoids leading to device failure in urea box or urea box during urea crystals in urea box due to volume expansion causes stress excessive, such as urea pump damage.
Description
Technical field
The present invention relates to the urea injection system fields purified for diesel engine vent gas.It is more particularly related to
Pressure relief device in urea box.
Background technology
Diesel engines at present tail gas clean-up drop nitric oxide system is required for filling a small amount of urea water in the exhaust pipe of engine
Solution, urea resolve into ammonia at high temperature, SCR catalyst help under, with nitrogen oxides generation react, generation nitrogen with
Water.Usual diesel vehicle urea for vehicle is the aqueous solution of urea of concentration 32.5% (i.e. the eutectic point of urea and water).
Above-mentioned aqueous solution of urea (hereinafter referred to as urea), by a container, i.e. urea box storage and vehicle-mounted use.32.5%
Urea start at subzero 11 DEG C crystallize (icings) formation solid.The solid masses density declines compared to liquid, therefore causes body
Product increases (expansion).Urea crystals form a crystalline shell, then to interior generally since close to urea chamber interior wall in urea box
Portion extends.Once crystal shell in this way is formed, internal liquid pressure incrementally increases, easily by the parts being immersed in urea or
Device damages by pressure.
Especially there is a kind of bottom to put integrated form urea pump, as shown in Figure 1, since urea pump is needed after being stopped by waste heat
Long period distributes, therefore urea around the pump, and especially top urea is the part finally crystallized.If the liquid finally crystallized
Body pressure cannot be released, and be found in practical applications, can urea pump be squeezed out urea box from bottom, be led to entirely integrated system
System damage.
Invention content
It is an object of the present invention to provide pressure relief devices in urea box, have certain heat insulating function using at least one
Slender pipeline urea never crystal region overflowed discharge fluid pressure, because volume is swollen when avoiding urea crystals in urea box
It is swollen to cause stress excessive and lead to device failure in urea box or urea box, such as urea pump damage.
In order to realize these purposes and other advantages according to the present invention, pressure relief device in urea box is provided, is urinated
Plain bottom portion is provided with urea pump, is internally provided with aqueous solution of urea, which is characterized in that including：An at least pressure release pipe,
Its radial adiabatic and internal diameter is tiny, the pressure release pipe lower end are sealingly fastened on the urea pump, and upper end protrudes from vertically
Outer urea liquid level is managed in pressure release and the part of protrusion has the spout hole outside penetrating through, and the pressure release pipe is close to urea pump
Lower part be provided with perforation aqueous solution of urea hole.
Preferably, pressure release pipe lower end extends outwardly the internal diameter being integrally formed gradually increased elongated end,
Described hole is set on the elongated end.
Preferably, the pressure release inside pipe wall is provided with liquidproof wetting coating.
Preferably, it is additionally provided with heat-conducting layer between the pressure release inside pipe wall and the liquidproof wetting coating.
Preferably, the tube wall that non-extended end part is managed in the pressure release is internally provided with annular hollow interlayer.
Preferably, vacuum or air or heat-insulating material are filled in the hollow sandwich.
Preferably, the pressure release pipe upper end is connected to by fixed structure at the top of urea box, the pressure release
Pipe is located at the spout hole that the part that at the top of urea box and pressure release is managed between outer urea liquid level is provided with outside perforation.
Preferably, it is provided at the top of the urea box towards the protrusion in urea box, it is close that the pressure discharges pipe upper end
Envelope is fixed with fixed structure, and recess forms fluted downwards for upper surface, and the protrusion is fastened in the groove.
Preferably, the urea box top lower surface is provided with fixing piece, and first with lower surface opening is hollow
Cavity, first hollow cavity have internal thread；The pressure release pipe upper end is fixed with connector, with up/down perforation
The second hollow cavity, second hollow cavity also has internal thread, and the release of second hollow cavity and pressure is managed coaxial
Setting, the second hollow cavity internal diameter are less than pressure release bore and equal to the first hollow cavity internal diameter, the fixed knots
Structure includes upper and lower part, and the top has external screw thread and is matched in the first hollow cavity and the second hollow cavity just,
The lower part is matched with just in pressure release pipe and with the third hollow cavity of bottom surface opening, the third hollow cavity
Bottom surface opening be tightly connected by horizontal heat-conducting plate, be provided with spontaneous heating material, the fixed knot on the heat-conducting plate
Structure lower part has the through-hole of perforation third hollow cavity and pressure release inside pipe wall.
The present invention includes at least following advantageous effect：
1st, the present invention realizes release urea liquid pressure using the tiny pressure release pipe of internal diameter, combines urea pump
Waste heat achievees the effect that discharge urea internal liquid pressure.
2nd, the liquid crystalization in the release of pressure in order to prevent pipe of the invention, on the one hand utilizes surface liquidproof wetting coating to drop
Urea height avoids crystallizing in pipe in low-pressure release pipe, and another aspect pressure discharges pipe sheet as heat-insulating material, presses simultaneously
Hollow sandwich is provided in power release tube wall, the inside and outside heat exchange of pipe can be discharged to avoid pressure.
3rd, the present invention is also provided with the preferable material of heat conductivility as heat-conducting layer in pressure release inside pipe wall, can be by urea pump
Waste heat be quickly transmitted to pressure release pipe inside urea liquid level on, avoid pressure release pipe inside liquid compared with pressure discharge
Liquid outside pipe crystallizes earlier, and the effect of release fluid pressure is not achieved.
4th, pressure of the invention release pipe upper end is connected to by fixed structure at the top of urea box, avoids pressure release pipe
It is damaged when urea is shaken inside by urea box.
Part is illustrated to embody by further advantage, target and the feature of the present invention by following, and part will also be by this
The research and practice of invention and be understood by the person skilled in the art.
Description of the drawings
Fig. 1 puts integrated form urea for prior art bottom and measures system schematic；
Fig. 2 is the pressure relief device schematic diagram of the present invention；
Fig. 3 is the pressure relief device enlarged diagram of the present invention；
Fig. 4 is the pressure relief device top enlarged diagram of the present invention；
Fig. 5 is fixed structure concrete structure schematic diagram in pressure relief device of the invention.
Reference sign：
100th, pressure release pipe；110th, hollow sandwich；120th, liquidproof wetting coating；130th, heat-conducting layer；200th, urea pump；
300th, fixed structure；310th, fixing piece；320th, connector；330th, top；340th, through-hole；350th, heat-conducting plate；400th, spout hole；
500th, outer urea liquid level is managed in pressure release；600th, urea liquid level in pressure release pipe；700th, crystallization urea；800th, urea is water-soluble
Liquid；900th, urea box.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings, to enable those skilled in the art with reference to specification text
Word can be implemented according to this.
It should be noted that in the description of the present invention, term " transverse direction ", " longitudinal direction ", " on ", " under ", "front", "rear",
The orientation or position relationship of the instructions such as "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outer " is based on attached drawing institutes
The orientation or position relationship shown is for only for ease of the description present invention and simplifies description, is not instruction or implies signified dress
It puts or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that limit of the invention
System.
As shown in Fig. 1 to 5, the present invention provides pressure relief device in urea box, and 900 bottom of urea box is provided with urea pump
200, it is internally provided with aqueous solution of urea 800, which is characterized in that including：An at least pressure release pipe 100, radial adiabatic
And internal diameter is tiny, 100 lower end of pressure release pipe is sealingly fastened on the urea pump 200, and upper end protrudes from pressure vertically
Outer urea liquid level 500 is managed in release and the part of protrusion has the spout hole 400 outside penetrating through, and the pressure release pipe 100 is close
The lower part of urea pump 200 is provided with the hole of perforation aqueous solution of urea 800.Preferably, 100 lower end of pressure release pipe is outside
Integrally formed internal diameter gradually increased elongated end is extended to, described hole is set on the elongated end.
In the above-mentioned technical solutions, it thoroughly does away with the elongated pressure of heat using at least one and discharges pipe 100, urinated in urea box 900
Plain 800 crystallization process of aqueous solution makes non-crystallized liquid go out from the non-crystal region overflow for being crystallized solid closed, reaches release
The effect of fluid pressure.
Pressure relief device is tiny by an at least internal diameter but the pressure release pipe 100 in radial adiabatic is formed, and installs
On 200 top of urea pump, 900 top of urea box is passed straight through to, urea pump 200 is arranged in the bottom of urea box 900, urea box 900
It is interior that there is aqueous solution of urea 800, hereinafter referred to as urea, it is liquid in normal state.100 bottom of pressure release pipe is roomy
It is exactly that bottom extends outwardly for elongated end so that bottom inner diameter gradually increases, and the space in elongated end is larger, and on elongated end
Multiple symmetrically arranged holes are provided with, conveniently allow aqueous solution of urea 800 inside and outside pipe that can flow freely, under pressure release pipe 100
End is sealingly fastened on urea pump 200, and pressure release pipe 100 is vertically arranged so that pressure release is stretched out at top manages outer urea liquid level
More than 500, the liquid that pressure is discharged in pipe 100 can be spilt on the outer urea liquid level 500 of pipe or pressure release pipe 100 is straight-through
To the top of urea box 900 and pass through urea spout hole 400 and 500 upper air phase of urea liquid level outside 900 inner tube of urea box are set
Urea logical, that release overflow goes out.
As shown in Figures 2 and 3.In arctic weather, for example subzero 11 DEG C hereinafter, when urea pump 200 is stopped, urine
Urea forms a shell after 900 inner wall of urea box starts crystallization in plain case 900, the crystal that urea is formed as time went on
It gradually grows up, shell is thickening.It is arranged in inside the urea pump 200 of 900 bottom of urea box since waste heat distributes so that urea pump 200
Surrounding especially 200 upper temp of urea pump is high compared with other regions in urea box 900, therefore urea herein finally can just be tied
It is brilliant.The closing once urea liquid level freezes, top are formed as crystallization urea 700, and lower part is aqueous solution of urea 800, subsequent urea
It can be made because urea crystals volume expansion to non-800 liquid of crystallization urea aqueous solution so that generate pressure by continuing crystallization process
Pressure rise, therefore, urea can discharge 100 inner passage of pipe through urea spout hole 400 to urea box 900 by above-mentioned pressure
Top overflows, until pressure release is managed on outer urea liquid level 500, so as to discharge fluid pressure, plays in protection urea box 900
Urea pump 200 or other devices are not damaged by pressure by excessive pressure.
The tiny definition of pressure release bore is discharged in pressure in pipe for aqueous solution of urea can generate capillarity, press
Power release pipe is equivalent to capillary.When there is no capillarity, under the gravity of aqueous solution of urea, in pressure release pipe
Outer liquid level should be equally high, the affine force difference of aqueous solution of urea and pressure release inside pipe wall, when pressure release bore foot
When enough tiny so that surface tension effects overcome gravity, that is, when the specific surface area of pressure release inside pipe wall is sufficiently large and big
During Mr. Yu numerical value, inner wall just generates capillary effect, overcomes gravity, and the urea solution that pressure is discharged in pipe flows downwards, from
And it is lower than the liquid level outside pressure release pipe, so as to which the liquid level in pipe will not together be crystallized with the liquid level outside pipe, reach release pressure
The effect of power, this is one of aspect certainly.
On the other hand, micro- exchange, that is, the convection current behavior of liquid can occur for the aqueous solution of urea in pressure release pipe, when
When liquid generates non-uniform heat flux, can all there be this convection current behavior.When temperature increases, liquid swelling volume, density reduces, so as to
The liquid of heat is to floating；When temperature reduces, liquid reduces volume, density increase, so as to which cold liquid is to sinking.Therefore pressure is released
Putting the aqueous solution of urea in pipe also has microcirculation, and down, the liquid of the heat of lower part up ensures pressure to the cold liquid on top
Stabilization is equal everywhere always for power release pipe internal temperature, will not generate crystallization.
In another technical solution, pressure release 100 inner wall of pipe is provided with liquidproof wetting coating 120.
In the above-mentioned technical solutions, it in pressure release pipe 100 inner wall setting liquidproof wetting coating 120, is pressed so as to reduce
Power release pipe in 600 height of urea liquid level come avoid pressure release pipe 100 in urea crystals.Liquidproof wetting coating 120 be
Pressure 100 inner wall of release pipe coats one layer of liquidproof wetting agent, using existing liquidproof wetting agent.
In order to avoid in pressure release pipe 100, the pressure release especially near urea liquid level in urea box 900 is managed
Interior urea crystals, present invention employs two technologies：1) pressure 100 wall of release pipe is made of heat-insulating material reduces heat inside and outside pipe
It exchanges；2) pressure release 100 internal diameter of pipe is tiny, and inner wall surface has liquidproof wetting coating 120, is driven using surface tension
Urea liquid level 600 moves down in pressure release pipe, and outer urea liquid level 500 is managed well below pressure release.It can delay in this way
Urea crystals in pressure release pipe 100, even if being urinated outside pressure release pipe 100 outer urea icing confining pressure release pipe 100
It remains to that pressure release intraluminal fluid face is kept to be in liquid during plain liquid level, as shown in Figure 4.Once outer urea liquid level is managed in pressure release
500, which freeze, closes, and non-crystallization urea liquid is constantly squeezed in subsequent crystallization process, therefore is had urea and released from pressure
Put pipe 100 to it is lower and on continuously outflow.Once flowing generates, will not be recrystallized in pressure release pipe 100, until all urea are complete
Until portion crystallizes.
Pressure release 100 internal diameter of pipe is designed very tiny, and be coated with liquidproof wetting coating 120 so that liquid consolidates surface energy
Increase, under liquid level can drive on surface, move down, finally so that urea liquid level is well below urea liquid level outside pipe in pipe.Separately
Through the tiny flowing velocity that can also accelerate urea in pipe in external pressure release pipe 100, crystallization possibility is further reduced.
In another technical solution, between pressure release 100 inner wall of pipe and the liquidproof wetting coating 120 also
It is provided with heat-conducting layer 130.
In the above-mentioned technical solutions, for stiffening effect, as shown in figure 4, other than top, in pressure release pipe 100
Wall can set one layer of good material of heat conduction that can urinate bottom for heat-conducting layer before liquidproof wetting coating 120 is coated
Quickly conduction to pressure discharges urea liquid level 600 in pipe to the heat of element pump 200, further ensures that urea in pressure release pipe 100
It does not crystallize.
In another technical solution, the tube wall of the 100 non-extended end part of pressure release pipe is internally provided with annular
Hollow sandwich 110.Vacuum or air or heat-insulating material are filled in the hollow sandwich 110.
In the above-mentioned technical solutions, pressure release 100 wall of pipe is designed for heat-insulating material, while pressure release 100 wall of pipe exists
Radially there must be preferable heat-insulating property, to prevent the urea in pressure release pipe 100 from first crystallizing, for example be provided with annular hollow
Interlayer 110, interlayer is interior either full of air or to fill other materials for playing thermal insulation for vacuum, discharges pipe 100 in pressure
Radially generate insulation effect, it is possible to reduce pressure discharges 100 internal-external heat exchange speed of pipe, delays urea in pressure release pipe 100
It radiates outside pipe.
In another technical solution, 100 upper end of pressure release pipe is connected to urea box by fixed structure 300
900 tops, the pressure release pipe 100 are located at the portion at the top of urea box 900 and between the outer urea liquid level 500 of pressure release pipe is outer
Set up the spout hole 400 being equipped with outside perforation separately.Preferably, 900 top of urea box is provided with towards convex in urea box 900
Rise, the 100 upper end sealing of pressure release pipe is fixed with fixed structure, upper surface downwards recess formed it is fluted, it is described convex
It rises and is fastened in the groove.
In the above-mentioned technical solutions, for mechanical stability, 100 top of pressure release pipe can also pass through fixed structure
300 connect with 900 top of urea box, and pressure is avoided to discharge pipe 100 and is damaged when urea shakes in by urea box 900.Gu
It is that concave shape is into reeded structure downwards for the pressure release fixed upper table in 100 upper surface of pipe to determine structure 300, and groove is with urinating
The protrusion that plain 900 top of case is set matches, so as to which pressure release pipe 100 is fixedly connected on 900 top of urea box.
In another technical solution, 900 top lower surface of urea box is provided with fixing piece 310, with following table
First hollow cavity of face opening, first hollow cavity have internal thread；100 upper end of pressure release pipe is fixed with company
Fitting 320, the second hollow cavity with up/down perforation, second hollow cavity also has internal thread, in described second
Cavity body is coaxially disposed with pressure release pipe 100, and the second hollow cavity internal diameter is less than pressure release 100 internal diameter of pipe and is equal to
First hollow cavity internal diameter, the fixed structure 300 include top 330 and lower part, the top 330 have external screw thread and just
It is matched in the first hollow cavity and the second hollow cavity, the lower part is matched with just in pressure release pipe 100 and under having
The third hollow cavity of bottom opening, the bottom surface opening of the third hollow cavity are connected by the horizontal sealing of heat-conducting plate 350
Connect, be provided with spontaneous heating material on the heat-conducting plate 350,300 lower part of fixed structure have perforation third hollow cavity and
Pressure discharges the through-hole 340 of 100 inner wall of pipe.
In the above-mentioned technical solutions, fixed structure 300 is that connection pressure discharges pipe 100 at the top of urea box 900, in order to
Pressure discharges the mechanical stability of pipe 100,, may if the waste heat of urea pump is inadequate when another external pressure release pipe 100 works
Lead to the urea crystals in pressure release pipe 100, so that the effect of release fluid pressure is not achieved in pressure release pipe 100,
Therefore it needs to set other heat sources, ensures the temperature in pressure release pipe 100, ensure to greatest extent in pressure release pipe 100
Urea liquid will not crystallize.The top of urea box 900 is provided with fixing piece 310 first, may be arbitrary shape, as long as
Ensure its first hollow cavity with cylindrical type, the bottom surface opening and axis of the first hollow cavity are managed with pressure release
100 axis overlaps, and the first hollow cavity is additionally provided with internal thread.100 upper end of pressure release pipe is fixed with connector 320,
Shape does not also limit, as long as the second hollow cavity of the round type with up/down perforation, also has and the first hollow cavity
The consistent internal thread of body, the axis of the second hollow cavity is overlapped with pressure release 100 axis of pipe, and internal diameter is less than pressure release pipe
100 internal diameters, but equal to the internal diameter of the first hollow cavity.300 connection fixture 310 of fixed structure and connector 320, including
Top 330 and lower part, top 330 are with externally threaded cylindrical structure, are matched with the first hollow cavity and second always
On the internal thread of hollow cavity, and it can rotate under external force, it is described so as to move up and down relative to pressure release pipe 100
Lower part is matched in pressure release pipe 100, that is, it is also cylindrical structure, and outer diameter is equal to pressure and discharges 100 internal diameter of pipe, greatly
In the second hollow cavity internal diameter, the lower part also has a third hollow cavity, and bottom surface is open and to pass through heat-conducting plate 350 close
Envelope, that is, third hollow cavity discharge pipe 100 with pressure by heat-conducting plate 350 and completely cut off, and heat-conducting plate 350 is good for heat conductivility
Material be made, be namely provided with spontaneous heating material in third hollow cavity on heat-conducting plate 350, form is generally solid-state,
After ingress of air can spontaneous heat release, not during ingress of air in a dormant state, control its exposure with air that can realize heat
The control release of amount, heat release work well.Third hollow cavity is provided with the through-hole 340 outside perforation, along the fixed knot
The lower part setting of structure 300 is multiple.
Under normal condition, 330 connection fixture 310 of top and connector 320 of fixed structure 300, so as to ensure pressure
The mechanical stability of pipe 100 is discharged, the top 330 of fixed structure 300 is located at the first hollow cavity and the second hollow cavity at this time
It is interior, and lower part is close to just positioned at the lower section of connector 320, and heat-conducting plate 350 is located at 400 top of spout hole；And working as needs volume
Outer heat source so that the air in pressure release pipe 100 is hot-air, when preventing the air crystallization in pressure release pipe 100, turns
The top 330 of dynamic fixed structure 300 moves downward so that and the through-hole 340 of lower part connects one by one with spout hole 400 just, this
When air entered in third hollow cavity by spout hole 400 and through-hole 340 so that the contact of spontaneous heating material in it is empty
Gas so as to automatic heating, is further continued for rotating down 300 top 330 of fixed structure, so that through-hole 340 and spout hole 400 are not
It communicates, seals third hollow cavity, the heat that spontaneous heating material generates at this time is transmitted to pressure release automatically by heat-conducting plate 350
In pipe 100, pressure is discharged into the air in pipe 100 and becomes hot-air.When uncrystallized urea liquid can move upwards circulation
When, it is rotated up fixed structure 300 at this time so that inside overflow port cut-in pressure release pipe 100, complete releasing for fluid pressure
It puts.Fig. 5 is structure diagram when through-hole 340 is communicated with spout hole 400.
Although the embodiments of the present invention have been disclosed as above, but its be not restricted in specification and embodiment it is listed
With it can be fully applied to various fields suitable for the present invention, for those skilled in the art, can be easily
Realize other modification, therefore without departing from the general concept defined in the claims and the equivalent scope, it is of the invention and unlimited
In specific details and legend shown and described herein.
Claims (9)
1. pressure relief device in urea box, urea box bottom is provided with urea pump, is internally provided with aqueous solution of urea, feature
It is, including：At least pressure release pipe, radial adiabatic and internal diameter is tiny, the pressure release pipe lower end sealing is fixed
In on the urea pump, upper end protrudes from pressure release and manages the part of outer urea liquid level and protrusion with overflowing outside perforation vertically
Discharge orifice, the pressure release pipe are provided with the hole of perforation aqueous solution of urea close to the lower part of urea pump.
2. pressure relief device in urea box as described in claim 1, which is characterized in that the pressure release pipe lower end is outside
Integrally formed internal diameter gradually increased elongated end is extended to, described hole is set on the elongated end.
3. pressure relief device in urea box as described in claim 1, which is characterized in that the pressure release inside pipe wall setting
There is liquidproof wetting coating.
4. pressure relief device in urea box as claimed in claim 3, which is characterized in that the pressure release inside pipe wall and institute
It states and is additionally provided with heat-conducting layer between liquidproof wetting coating.
5. pressure relief device in urea box as claimed in claim 2, which is characterized in that non-extended end is managed in the pressure release
Partial tube wall is internally provided with annular hollow interlayer.
6. pressure relief device in urea box as claimed in claim 5, which is characterized in that be filled in the hollow sandwich true
Empty or air or heat-insulating material.
7. pressure relief device in urea box as described in claim 1, which is characterized in that the pressure release pipe upper end passes through
Fixed structure is connected at the top of urea box, the pressure release pipe is located at the top of urea box and pressure release manage outer urea liquid level it
Between part be provided with perforation outside spout hole.
8. pressure relief device in urea box as claimed in claim 7, which is characterized in that be provided with court at the top of the urea box
Protrusion into urea box, the pressure release pipe upper end sealing are fixed with fixed structure, and recess is formed with downwards for upper surface
Groove, the protrusion are fastened in the groove.
9. pressure relief device in urea box as claimed in claim 7, which is characterized in that the urea box top lower surface is set
Fixing piece is equipped with, the first hollow cavity with lower surface opening, first hollow cavity has internal thread；The pressure
Release pipe upper end is fixed with connector, the second hollow cavity with up/down perforation, and second hollow cavity also has interior
Screw thread, second hollow cavity are less than pressure release pipe with pressure release pipe coaxial arrangement, the second hollow cavity internal diameter
Internal diameter and equal to the first hollow cavity internal diameter, the fixed structure include upper and lower part, and the top has external screw thread and just
It is matched with well in the first hollow cavity and the second hollow cavity, the lower part is matched with just in pressure release pipe and with bottom
The third hollow cavity of face opening, the bottom surface opening of the third hollow cavity are tightly connected by horizontal heat-conducting plate, institute
It states and spontaneous heating material is provided on heat-conducting plate, the fixed structure lower part has in perforation third hollow cavity and pressure release pipe
The through-hole of wall.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810236292.7A CN108252777B (en) | 2018-03-21 | 2018-03-21 | Pressure release device in urea box |
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|---|---|---|---|
| CN201810236292.7A CN108252777B (en) | 2018-03-21 | 2018-03-21 | Pressure release device in urea box |
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| CN108252777B CN108252777B (en) | 2023-09-08 |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN108252777B (en) | 2023-09-08 |
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Denomination of invention: Pressure release device inside urea tank Granted publication date: 20230908 Pledgee: Agricultural Bank of China Limited Wuhan Hongshan Branch Pledgor: LOTUSFAIRY POWER TECHNOLOGIES Corp. Registration number: Y2024980001408 |