• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
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  • 法律状态
  • 优先权
    • 专利摘要:
    13 ABSTRACT The invention relates to a hose system (l)(4), treatment device, for feeding a fluidfor example from a tank holding urea to an exhaust-gasand primarily intended for heavy commercialvehicles such as trucks and buses and for use in areas withcold weather, (2,3)- comprising at least a first and a second hoseThe invention is achieved by that the first hose (2) is(3), is made of a flexible material permitting it to expand arranged inside the second hose that the first hose (2) radially outwards, that the second hose (3) is made of asubstantially inflexible material and arranged tosubstantially keep its diameter when exposed to pressure frominside, and that the first hose (2) is arranged to allow fluid(4) under pressure to flow outside a frozen core of fluid/urea(4a), (2), in a direction against ice present in the inner volume of the first hosethereby expanding the first hose (2)the inside of the second hose (3) creating a passage aroundthe frozen core of fluid/urea ice (4a). (Figure la)
    公开号:SE1451557A1
    申请号:SE1451557
    申请日:2014-12-16
    公开日:2016-06-17
    发明作者:Köhler Andreas
    申请人:Scania Cv Ab；
    IPC主号:
    专利说明:

    FLEXIBLE HOSE, PRIMARILY INTENDED FOR TRANSPORTING FLUID/UREAIN A VEHICLE IN COLD WEATHERTECHNICAL FIELDThe present invention relates to a hose system in a vehiclefor feeding a fluid, a solution comprising urea from ae.g.tank to an exhaust-gas treatment device. The hose system isintended to solve the problem with fluid freezing in the hosesystem when the vehicle/engine is not used for a certainperiod of time and in a simple, fast and cost effective mannermelting frozen fluid thereby making it possible to start theexhaust-gas treatment system and the vehicle in cold weather,without a substantial time delay. The invention isparticularly intended for heavy commercial vehicles such astrucks and buses but can of course be used in other vehiclesor in other applications. The invention also relates to avehicle provided with a hose system according to theinvention.
    BACKGROUND ARTIn order to comply with the ever more restrictive standards tolimit air-pollution by exhaust gases produced by motora SCR circuitvehicles, (a Selective Catalytic Reductionsystem) has to be used in relation to the exhaust systems ofmotor vehicles, in particular in heavy commercial vehiclessuch as trucks and buses.
    The SCR system injects an aqueous solution by e.g. compressedair at the inlet of the catalyzer in the vehicle, located atthe silencer of the exhaust gases. Ammonia is generally usedas reducing agent and a widely used solution is an urea-watersolution containing e.g. 32.5% urea, available under the tradeAdBlue®. In the vehicle catalyzer the urea reacts with thenitrogen oxides in the exhaust gases, eliminating these oxidesfrom reaching the atmosphere.
    To carry out this process, the solution containing urea isavailable in a tank installed in the vehicle, from which theurea solution is pumped and injected into the catalyzer, afterhaving been mixed with e.g. compressed air, in order to reducethe nitrogen oxide compounds in the exhaust gases.
    However a reducing agent will freeze at low temperatures. Thereducing agent AdBlue®, for example, will freeze at tempera--ll °C and below.tures of Such temperatures may occur forexample during long standstill phases of a vehicle.
    An aqueous reducing agent expands when freezing. A deliverydevice must therefore be designed in such a manner that it isnot damaged by the expansion of the freezing reducing agent orby the associated pressure increase.
    PROBLEMIn cold weather below -ll C° and when having the vehiclestopped/parked the urea solution eventually will freeze in thehoses of the urea system. In order to start up a frozen systemcomprising an urea solution, and this is desirable before thevehicle engine is started, all hoses in the system must beheated/warmed so that the frozen urea solution will meltpermitting urea to flow unhindered through the system. Thiswill,in known urea systems, take some time and will normallyuse considerable electric energy provided from the vehiclesbattery.
    Known systems to solve these problems are often complex andcontains a number of components, as well as electricalcircuits/components, which makes them expensive to manufactureand install and they will also consume electric energy whenused. To melt the ice in the hoses the vehicle engine has tobe started, which will result in higher fuel consumption.In the international patent application WO20l2/038925 (Dytech-Dynamic Fluid Technologies S.P.A.) is described a piping for aSCR circuit intended for a motor vehicle and for feeding asolution comprising urea. The piping comprises an electricalresistor surrounding an inner pipe for heating the solutiontherein containing urea. In this system the outer pipe/hose isflexible and the inner pipe/hose is stiff and the electricalresistor uses electric current from the vehicles battery/-alternator system for heating the fluid inside the pipe/hose.In the international patent document WO2009/095941 (DaycoFluid Technologies S.P.A.) is described a multilayer hose/pipefor conveying an aqueous solution containing urea. Theinvention comprises a heating element and an insulating layer.The heating element is a tubular braid or net element wrappedaround the inner conveying pipe, and in which net at least onewire is formed by a conductive material, such as a resistor.The heating require that electrical energy is fed to thesystem. The pipe is made of hydrolysis-resistant thermoplasticmaterial.
    In the patent application document US2009/0255232 (Barcin) isdescribed a method and device for treating exhaust gases of aninternal combustion engine with a reducing agent injected intothe exhaust gases. The reducing agent can circulate between adelivery device and a reactant reservoir particularly when thedosing valve is closed, preventing the reactant from freezing.
    Other solutions to the problem of frozen fluid/urea in pipesexist in the market but none of these prior known systemsdescribes a method or a hose system that offers a simple, costeffective and an immediate start up possibility for a frozenfluid/urea system according to the present invention.robustThe present invention provides a cost effective, light,and easy to install solution. No electrical cables have to beinstalled and no electrical current have to be used.
    Other solutions to this problem exist in the market but noneof these prior known systems illustrates a hose system thatoffers a fast method for heating and melting the frozenurea/ice.
    SUMMARY OF THE INVENTIONOne object of the present invention is to solve the abovementioned problems and to provide a simple hose system forrapidly melting frozen urea/ice and making it possible tostart the system/vehicle without a considerable time delay.
    Another object of the invention is to design a hose systemthat does not need installation of heavy or space consumingcomponents.
    Another object of the invention is to design a hose systemthat does not consume electric energy.
    Another object of the invention is to design a hose systemcontaining as few components as possible.
    A further object of the invention is that installation of thehose system should be easy and not require extensivenew/different installation procedures.
    These and further objects and advantages is achieved by theinvention by a method and a hose system designed in accordancewith the features recited in claim l.
    The invention is achieved by means of using an inner flexiblehose, for transporting a fluid, located inside or insertedinto an outer substantially inflexible hose where the outerinflexible hose is at least partly perforated allowing air topass into or out from the volume formed between the inner andouter hoses. The inner hose is arranged to expand when exposedto an internal pressure, such as from an increasing fluidpressure, thereby allowing warm or at least thawed, fluid/ureato flow through the hose between the present frozen urea orice and the inner wall of the flexible hose thereby meltingthe remaining frozen fluid/urea inside the hose system. Theflexible inner hose allow fluid/urea to flow in the system assoon as the fluid is supplied under pressure to the hosesystem as it may flow radially outside the frozen core,expanding the diameter of the inner hose. The outer inflexiblehose will protect the inner flexible hose from surroundingcomponents but also to limit the expansion of the inner hosepreventing it from disrupting.
    The first inner hose may be made of EPDM, FKM or HMBR and thesecond outer hose may be made of PA. The outer hose may alsobe made of EPDM, e.g. provided with reinforcement that makesit handle pressures of up to, or more than, 20 bar.
    Advantages of the invention/solution are that the exhaust-gastreatment system will start up more or less immediately andthat no electric energy/heating is needed for melting frozenfluid/urea in the hoses. The vehicle will also be more fuelefficient, consuming less fuel.
    Further features and advantages of the invention will beapparent from the following, more detailed description of theinvention and the accompanying drawings and the claims.
    BRIEF DESCRIPTION OF THE DRAWINGSThe invention is described below in some preferred embodimentsillustrated in the accompanying drawings.
    Figure la is a perspective view of an activated, pressurized,hose system according to the invention.
    Figure lb illustrates a detailed sectional view, from theside, of the hose system illustrated in figure la.Figure 2a is a perspective view of an inactive, depressurized,hose system where the fluid, the urea, has frozen to ice.
    Figure 2b illustrates a detailed sectional side view of theinactive, depressurized, hose system, here with frozen urea inthe center of the hose system.
    Figure 3a illustrates a detailed sectional side view of thehose system but now activated and pressurized by warm fluid,still with ice in the middle of the inner hose.
    Figure 3b illustrates a detailed sectional side view of thehose system in a somewhat later stage where most of the icehas melted.
    Figure 4 illustrates a detailed sectional side view of thehose system in a fully activated stage where all ice hasmelted.
    DESCRIPTION OF PREFERRED EMODIMNTSThe present invention relates to a hose system intended forfeeding a fluid, especially a solution comprising urea, from areservoir/tank to an exhaust-gas treatment device connected tothe vehicles exhaust system. The invention permits fluid/ureato be transported in the hose system immediately whenactivated thereby melting the frozen fluid and making itpossible to operate the exhaust-gas treatment system, andstart the vehicle, in cold weather without substantial timedelays.
    Figure la is a perspective view of an activated, pressurized,hose system l according to the invention. A first, inner, hose2 of a flexible material is inserted into a substantiallyhose 3. Inside the inner hose 2 ainflexible second, outer,fluid 4 is transported, for example from a tank (not shown)warmed by the cooling fluid from a vehicle engine(not shown),to for example a device(not shown) arranged in the vehiclefor delivering reducing agent, like urea, into an exhaust-gastreatment device (not shown). The pressure of the fluid 4expands the flexible inner hose 2 in a radial directionagainst the inside of the outer substantially inflexible hose3. The outer inflexible hose 3 is at least partly perforatedby small holes 5 in such a way that air could pass into or outfrom the volume 6 formed between the inner hose 2 and outerhose 3.Figure lb illustrates a detailed sectioned view, from theside, of the hose system l illustrated in figure la. The fluid4, for instance urea, flows inside the inner flexible hose 2from e.g. a tank (not shown) to e.g. an exhaust-gas treatmentdevice (not shown). Due to the pressure of the fluid the innerhose 2 expands in a radial direction against the inside of thesubstantially inflexible outer hose 3. The air in the volume 6between the inner and outer hoses 2,3 is passing out throughthe holes 5 of the outer hose 3.
    Figure 2a is a perspective view of an inactive, depressurized,hose system l where the fluid 4, the urea in the hose systeml, has frozen to ice. The outer hose 3 substantially maintainsits normal shape, it does not change its diameter in anysignificant way, while the inner flexible hose 2 shrinks insuch a way that its diameter is decreased, still holding acertain volume of fluid 4 in its inner volume. When a vehicleis parked in cold weather it does not take long for the ureafluid 4 to freeze in the hoses 2,3. The urea present in thetank/reservoir will not freeze for a long time as thetank/reservoir has been warmed by the engine cooling systemand also keeps a large volume of fluid, urea.Figure 2b illustrates a detailed sectioned side view of theinactive, depressurized, hose system l, here with frozenfluid/urea 4 in the center of the hose system l. Air has beensucked in via the holes 5 arranged in the outer hose 3. In afirst stage fluid/urea, is partly squeezed out of the innerhose 2 back to the reservoir/tank and/or to the exhaust-gastreatment device when it shrinks to a smaller diameter. At asecond stage, when the vehicle has been standing still for awhile, in cold weather, the fluid/urea 4 will begin to freezein the hose system l. This may result in that the diameter ofthe inner hose 2 will increase in some degree due to theexpansion of the fluid/urea 4 ice. The dimensions of the hoses2,3 are so arranged that there will still be a certain volume6 of air between left between the inner hose 2 and the outerhose 3.
    As an example of dimensions of the hoses 2,3 the diameter ofthe inner hose 2 may be for instance 5 mm at a low pressure,such as a pressure of l bar and its diameter may expand to forinstance 6 mm at a higher fluid pressure, for instance at 9bar, as may be the case when freezing. This gives enough spacebetween the inside of the inner hose 2 and the fluid/urea 4ice for permitting warm urea to flow and melt the frozen ureaof the inner hose 2. The outer hose 3 is substantially rigidhaving an inner diameter of for example l2 mm and willwithstand the pressure from the inner hose 2, and willsubstantially keep its dimensions, which may occur duringnormal use, for example at 20 bar.
    Figure 3a illustrates a detailed sectioned side view of thehose system l but again activated after a standstill of thevehicle and an inactivated urea system. Warm fluid underpressure, pressurized by e.g. a pump (not shown) or similar,will be forced into the inner hose 2 between the frozenfluid/urea 4a and the inside wall of the inner hose 2. Theinner hose 2 will expand, eventually until the inner hose 2 ispressed against the inner side of the outer hose 3. This meansthat fluid/urea 4, generally warmed in a tank by for instancethe cooling fluid of the engine, will flow into the volumebetween the frozen fluid/urea 4a and the wall of the innerhose 2. In this way the urea system will be activated more orless immediately and will also rapidly melt the remainingfrozen fluid/urea 4a in the inner hose 2.
    Figure 3b illustrates a detailed sectional side view of thehose system l in a somewhat later stage where most of thefrozen fluid/urea 4a has melted. The figure illustrates how asmall center part of the frozen fluid/urea 4a still remains.
    Figure 4 illustrates a detailed sectional side view of thehose system l in a fully activated stage where all fluid/ureaice 4a has melted and no frozen urea remains in the hosesystem l.
    The above description is primarily intended to facilitate theunderstanding of the invention. However the invention is ofcourse not in any way restricted to only the disclosedembodiments, but many possibilities to modifications would beapparent to a person skilled in the art within the scope ofthe invention without departing from the basic idea of theinvention as defined in the appended claims.
    权利要求:
    Claims (8)
    [1] l. Hose system (l) for feeding a fluid (4), for example from atank holding urea to an exhaust-gas treatment device, andprimarily intended for heavy commercial vehicles such astrucks and buses and for use in areas with cold weather,comprising at least a first and a second hose (2,3),characterized in that- the first hose (2) is arranged inside the second hose(3),- the first hose (2) is made of a flexible materialpermitting it to expand radially outwards, and- that the first hose (2) is arranged to allow fluid/urea(4) under pressure to flow outside a frozen core offluid/urea ice (4a), present in the inner volume of thefirst hose (2), thereby expanding the first hose (2) in adirection against the inside of the second hose (3)creating a passage around the frozen core of fluid/urea ice (4a).
    [2] 2. Hose system (l) according to claim l, characterized in that the second hose (3) is made of a substantially inflexiblematerial and arranged to substantially keep its diameter when exposed to pressure from inside.
    [3] 3. Hose system (l) according to claim l or 2,characterized in thatthe second outer hose (3) is arranged with perforations or holes (5) through its wall, allowing air to pass through.
    [4] 4. Hose system (l) according to any preceding claims, characterized in that 12 the first inner hose (2) is made of a material allowing it to expand its diameter by up to 20%.
    [5] 5. Hose system (l) according to any preceding claims,characterized in that the first inner hose (2) is made of at least one of thematerials EPDM, FKM or HMBR.
    [6] 6. Hose system (l) according to any preceding claims,characterized in that the second outer hose (3) is made of at least one of thematerials EPDM or PA.
    [7] 7. Method for feeding a fluid, for example from a tank holdingurea to an exhaust-gas treatment device, in cold weather,primarily intended for heavy commercial vehicles such astrucks and buses and comprising at least a first and a secondhose (2,3),characterized in the following method steps, second hose (3), to expand radially outwards - inserting the first hose (2) into the- allowing the first hose (2)when pressurized,- substantially keeping the diameter of the second hose (3)when exposed to pressure from inside, and- allowing fluid (4) under pressure to flow outside a frozen core of fluid/urea ice (4a) present in the inner (2), in a direction against the inside of the second volume of the first hose thereby expanding the firsthose (2)hose (3) creating a passage around the frozen core offluid/urea ice (4a).
    [8] 8. Vehicle provided with a hose system (1) according to any of the claims l-6.
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    同族专利:
    公开号 | 公开日
    SE539206C2|2017-05-09|
    DE102015015208A1|2016-06-16|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE102005002318A1|2005-01-17|2006-07-27|Robert Bosch Gmbh|Exhaust gas aftertreatment process and device for this purpose|
    US20110262310A1|2008-01-30|2011-10-27|Dytech - Dynamic Fluid Technologies S.P.A.|Multilayer hose for conveying an aqueous solution containing urea|
    ITTO20100773A1|2010-09-22|2012-03-23|Dytech Dynamic Fluid Tech Spa|PIPE FOR A SCR CIRCUIT OF A VEHICLE|CN107859803B|2017-11-14|2019-08-13|胜利油田兴达高祥新材料有限责任公司|It is a kind of can heating and thermal insulation petroleum transportation pipe|
    法律状态:
    2021-08-03| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    SE1451557A|SE539206C2|2014-12-16|2014-12-16|A method for feeding a fluid and a flexible hose, primarily intended for transporting fluid/urea in a vehicle in cold weather|SE1451557A| SE539206C2|2014-12-16|2014-12-16|A method for feeding a fluid and a flexible hose, primarily intended for transporting fluid/urea in a vehicle in cold weather|
    DE102015015208.4A| DE102015015208A1|2014-12-16|2015-11-24|A flexible hose intended primarily for transporting a liquid / urea in a vehicle in cold weather|
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