• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Anti-foam degassing device for a fuel dispensing device comprising: - a fuel circulation pump (1), - a vortex degassing enclosure (2) connected to the outlet of the pump (1) and fitted with a lateral outlet pipe (8) for degassed fuel and an axial outlet pipe (9) for a gas-enriched fuel fraction, - a separation tank (3) connected to the axial outlet pipe (9) in which the liquid fuel separates by gravity before being transferred again to the pump (1) and, - control means (20) make it possible to vary the flow rate of the fraction taken by the axial outlet pipe (9 ) depending on its gas content. The axial outlet pipe (9) opens at the lower part of the separation tank (3), in the liquid fuel separated by gravity, so as to prevent the formation of foam in this tank.
    公开号:BE1019600A5
    申请号:E2008/0383
    申请日:2008-07-11
    公开日:2012-09-04
    发明作者:Franck Christian Bizien
    申请人:Tokheim Holding Bv；
    IPC主号:
    专利说明:

    "Antifoam degassing device for a fuel dispensing device, in particular for biofuel" "Antifoam degassing device for a fuel dispensing device, in particular for biofuel"
    The present invention relates to a device for degassing the liquid dispensed for a fuel dispensing device, in particular biofuel.
    It is customary to equip the fuel dispensing apparatus with degassing systems in order to ensure that the measurement of the volume of fuel delivered to the user actually corresponds to liquid fuel and not to a mixture of liquid fuel and gas (air and hydrocarbon vapors).
    The percentage of allowable gas volume in the liquid is defined in particular by the regulation R 117 of the OIML (International Organization of Light Metrology).
    Such degassing systems conventionally contain: - a fuel circulation pump from a storage tank, - a degassing chamber, in particular a Vortex, fed with a liquid / gas fuel mixture via a connected inlet line at the outlet of the pump and provided with two outlet pipes, namely a lateral pipe for the degassed liquid fuel and an axial pipe for a fraction of gas-enriched fuel, and an atmospheric pressure separation tank connected to the axial outlet pipe of the degassing chamber in which the liquid fuel contained in the gas-enriched fraction separates by gravity before being transferred again to the suction side of the pump, this separation tank being equipped with a safety orifice allowing the evacuation to the outside of the separated gases.
    The degassing chamber generally has an elongated cylindrical shape so as to create at its inner part a helical circulation of the mixture introduced by the inlet pipe and collect degassed fuel through the lateral outlet pipe and the fraction enriched with gas through the axial outlet pipe.
    Such a degassing system is for example described in EP 0 357 513.
    According to this prior publication, the degassing chamber is associated with detection means making it possible to control the distribution of liquid fuel as a function of its gas content and possibly to stop it if this content is greater than a predetermined value.
    The disadvantage of such a system is related to the fact that, when the fuel entering the degassing chamber contains very little gas, which is the most common mode of operation, the fraction taken by the pipe of axial outlet and transferred to the separation tank is still slightly loaded with gas.
    This fraction of fuel must remain in the separation tank for some time before being recycled to the pump inlet, which significantly reduces the efficiency of the distribution system, especially since this lightly loaded liquid gas tends to cause the formation of foam in the pump due to its mixing.
    For this reason, it would be desirable to be able to reduce the flow rate of the liquid / gas mixture taken from the axial outlet pipe of the degassing chamber, which however is not possible in practice, since an accidental reason, the fuel is heavily loaded with gas, it is necessary that this outlet pipe has a diameter sufficient to allow effective degassing of the fuel.
    To remedy this drawback, it has already been proposed, according to document FR 2 730 484, to connect to the axial outlet duct of the degassing chamber control means making it possible to vary the flow rate of the fraction enriched in gas. taken by this pipe according to its gas content.
    It is thus possible to take and transfer to the separation tank a large fuel flow when its gas content is high and a lower flow rate when the fuel is only lightly loaded with gas.
    Such a degassing device is generally satisfactory when equipped with fuel dispensing equipment of petroleum origin.
    This is not the case, however, in the case of devices for distributing biofuels, especially based on alcohols such as ethanol or based on esters such as biodiesel or domestic fuel oil without antifoam additive.
    However, the increasing scarcity of oil, which has resulted in a constant increase in its price and the increasing consideration of problems related to the preservation of the environment, have led specialists to seek to develop such biofuels as sources of energy. alternative energy economically viable.
    In the particular field of the automobile, biofuels are based on alcohols, which are generally obtained from sugar cane, beet or cereals such as wheat or based on esters which are derived from Vegetable oils such as corn, rapeseed or palm oil are indeed a particularly interesting alternative to oil, especially since it can make agricultural waste profitable and extend arable land. .
    For this reason, more and more service stations are equipped with biofuel dispensing devices that generally result from a mixture of plant-based compounds and petroleum fuels, such as example, the biofuel called "E85" which contains essentially 85% of alcohol, in particular ethanol, and 15% of standard petroleum fuels or "B30" biodiesel containing 30% of derivatives of agricultural origin and 70% of petroleum derivatives.
    The composition of biofuels of this type can, however, vary considerably according to their production site and the seasons, and these very frequently contain, in addition to fuels of petroleum origin and of ethanol or esters, in variable proportions, methanol, higher alcohols such as propanol or butanol, esters corresponding to fermentation residues, acetic acid and a significant amount of water; additives must also be added to ensure their good preservation over time.
    As a result, it has been found that some fuels sometimes have a strong tendency to generate foams that require a longer settling time in the separation tank before concentrating as a liquid.
    In the known degassing devices of the aforementioned type, the axial outlet pipe of the degassing chamber conventionally opens at the upper part of the separation tank, above the level of the liquid fuel separated by gravity, which gives overall satisfaction. in the case of petroleum fuels.
    However, and in view of the fact that, in order to meet the above requirements and to limit the "leakage" flow rate, the diameter of this pipe must be kept as low as possible, such a configuration may lead to problems when the transferred fuel is a biofuel in particular based on biodiesel.
    The liquid fuel / gas mixture can indeed then form a foam capable, depending on the respective proportions of gas and liquid, to have a height such that it fills the separation tank until causing overflows through the orifice of security.
    This also results in risks of overflow of this foam to the circulation pump by the return line of the liquid fuel separated by gravity, which can affect to a large extent the operation of the fuel distribution system, in in particular to defusing the pump and a loss of pumping efficiency.
    The object of the present invention is to remedy these drawbacks by proposing a degassing device for a fuel dispensing apparatus, in particular a biofuel of the aforementioned type, in which the control means connected to the axial outlet pipe of the enclosure of Degassing can not contribute to foam formation.
    According to the invention, such a device is characterized in that the axial outlet duct of the degassing chamber opens at the lower part of the separation tank, in the liquid fuel already previously separated by gravity, so as to avoid the foam formation in this tank.
    The liquid / gas fuel mixture from the degassing chamber is thus transferred to the lower part of the separation tank, which is filled with liquid fuel so as to prevent or at least limit the formation of foam.
    According to a particularly advantageous characteristic of the invention, the control means are constituted by a control cylinder equipped on the one hand with a front opening connected to the axial outlet duct of the degassing chamber as well as an opening side connected to a discharge pipe opening to the lower part of the separation tank, and secondly to a piston diaphragm subjected to the action of a return spring and sensitive to the density of the fraction gas-enriched fuel flowing in the axial outlet duct of the degassing chamber, therefore the amount of gas present in this fraction to open or close the lateral opening of the control cylinder in proportion to this amount.
    According to this characteristic, the fuel fraction enriched in gas flowing in the axial outlet duct of the degassing chamber passes through the diaphragm of the piston which is pushed by the return spring.
    The force exerted by the piston on the spring depends on the pressure drop created by the diaphragm.
    This pressure drop P is of the type characterizing a turbulent flow in a diaphragm and can therefore be represented by the relation P = Kpv2 in which K is a geometrical factor, p represents the density of the fuel fraction enriched in gas and v the flow velocity thereof.
    As a result, this pressure drop P depends on the gas content of the mixture passing through the diaphragm.
    As a result, the position of the piston in the control cylinder depends on the gas content of the separated gas-enriched fuel fraction at the degassing vessel.
    According to this position, the piston opens or closes the lateral opening of the control cylinder, in proportion to the amount of gas present in the fuel.
    According to the invention, the control cylinder and / or the diaphragm piston and / or the axial outlet pipe of the degassing chamber can advantageously be made of brass for pure petroleum products, stainless steel for highly loaded fuels in biofuel or in a suitable plastic material.
    According to another characteristic of the invention, the front face of the control cylinder opposite the front opening is equipped with a piston guide needle having a conical end for closing the diaphragm.
    It should be noted that this guide needle has no specific function as part of the fuel degassing process but guarantees a good obstruction of the diaphragm thanks to its conical end.
    The guiding needle thus makes it possible to reduce as much as possible the internal leakage of liquid towards the lateral opening of the control cylinder in the vicinity of the piston when the latter is in the position pushed back to the maximum.
    According to the invention, the free end of the discharge pipe can lead directly into the liquid fuel separated by gravity at the bottom of the recovery tank.
    According to another characteristic of the invention, the discharge pipe may be equipped with a filter at its free end.
    Such a filter has the function of limiting the exit velocity of the residual gases and to improve their diffusion in the liquid fuel present at the bottom of the separation tank so that these gases can rise more rapidly towards the surface.
    According to another characteristic of the invention, the discharge pipe is equipped with a gas separator of the type known as a "stack of plates" at its free end.
    Such a gas separator which is well known to those skilled in the art makes it possible to roll the liquid fuel and to force the micro-bubbles contained therein to gather along the walls of the plates and then to collect into bubbles of significant size which can then quickly rise by gravity to the surface of the liquid contained in the separation tank.
    According to another particularly advantageous feature of the invention, the safety opening of the separation tank is connected to a system for recovering the aspirated fuel vapors.
    Such systems are increasingly installed in fuel dispensers to reduce the risk of air pollution.
    It should be noted that this safety orifice may also be equipped with a flame arrester or a calibrated valve opening only above a predetermined pressure, compatible with the proper functioning of the degassing members .
    The characteristics of the antifoam degassing device which is the subject of the invention will be described in more detail with reference to the appended nonlimiting drawings in which: FIG. 1 is a schematic view of a degassing device according to the invention; state of the art, - Figure 2 is a schematic view corresponding to Figure 1 but showing an anti-foaming degassing device according to the invention - Figure 3 is a detailed view of the degassing chamber and means of control.
    According to FIG. 1, the degassing device essentially contains a fuel circulation pump 1, a Vortex 2 degassing chamber and a separation tank 3.
    It should be noted that the pump 1 may be of any type, in particular gears as shown in FIG. 1 or vane as shown in FIG. 2.
    The pump 1 is associated with a check valve 4 and a filter 5 so as to allow the circulation of fuel from a storage tank not shown according to the arrow A by the supply line 6.
    The degassing chamber 2 has an elongated cylindrical shape and is provided with two outlet pipes, namely a lateral pipe 8 and an axial pipe 9; it is designed so as to create at its inner part a helical circulation of the liquid / gas fuel mixture transferred along arrow B by the inlet pipe 7.
    Degassed fuel is taken by the lateral outlet pipe 8 according to the arrow C to allow the filling of the tank of motor vehicles.
    A fraction enriched in gas, shown schematically by the arrow E, is taken by the axial outlet pipe 9 which is connected to a transfer pipe 10 which is itself connected to the separation tank 3 by means of control means 30 which make it possible to varying the flow rate of the enriched gas fraction taken by the axial outlet 9 as a function of its gas content.
    According to FIG. 1, the degassing chamber 2 furthermore comprises a recycling circuit 11 or bypass equipped with the valve 4 which makes it possible to reintroduce, according to the arrow D, the excess flow of undelivered fuel into the tank of a vehicle at the same time. pump inlet 1.
    The fraction of fuel enriched in gas leaving the degassing chamber 2 by the axial outlet pipe 9 is transferred by the transfer pipe 10, according to the arrow E, into the control means 30, then to the upper part of the separation tank 3 according to the arrow I.
    According to FIG. 1, these control means 30 are constituted by a control cylinder 37 at the inner part of which a set of two pistons subjected to the action of a return spring 38, namely a first piston 34 which acts on a second piston 35 which is secured to it to open or close a lateral opening 36 through which the air / fuel mixture can be discharged to the separation tank 3 according to the arrow I.
    The control cylinder 37 further comprises a first inlet 33 connected to the transfer pipe 10 and a second inlet 31 connected to a pipe 32 connected to the recycling circuit 11.
    The reciprocating movement of all the pistons 34, 35 to the inner part of the control cylinder 37 is thus controlled by the pressure difference between the pressure of the presumed degassed liquid circulating in the recycling circuit 11 and the pressure of the fuel fraction enriched in gas flowing in the transfer pipe 10.
    According to FIG. 1, the liquid fuel contained in the fraction transferred to the upper part of the separation tank 3 by the lateral evacuation opening 36 along the arrow I separates from the gas by gravity and collects at the bottom of the tank. this tank.
    A valve 13 actuated by a float 15 allows the liquid fuel thus decanted according to the arrow G to be recycled to the inlet of the pump 1.
    The float 15 is progressively raised by the liquid fuel present at the lower part of the separation tank 3 and automatically opens the valve 13 when the liquid has reached a predetermined level.
    According to Figure 1, the separation tank 3 is also equipped with a safety orifice 14 allowing the evacuation of gases separated outwardly according to the arrow H.
    In a manner not shown in the figures, this safety orifice 14 is advantageously connected to a system for recovering aspirated fuel vapors.
    The control means 30 equipping the device shown in Figure 1 give overall satisfaction in the context of degassing petroleum fuels, but their effectiveness is insufficient in the presence of fuels capable of generating larger amounts of foam.
    The control means 20 equipping the antifoam degassing device shown in Figures 2 and 3 overcomes this drawback.
    It should be noted that with the exception of these control means 20, the other elements of this device are largely similar to those equipping the device shown in Figure 1 and are designated by the same references.
    According to FIGS. 2 and 3, the control means 20 consist of a control cylinder 27 equipped with a front opening 28 connected to the transfer line 10 connected to the axial outlet pipe 9 of the degassing chamber 2 and only a lateral opening 23 connected to a discharge pipe 24 opening to the inner part of the separation tank 3 below the level of the liquid fuel already separated by gravity to the lower part of this tank.
    According to FIG. 2, the free end 25 of the evacuation pipe opens directly into the separated fuel at the bottom of the tank 3.
    In a manner not shown in the figures, the free end 25 of the discharge pipe 24 may also be equipped with a filter or a gas separator of the type called "stack of plates".
    According to FIGS. 2 and 3, the control cylinder 27 is equipped at its inner portion with a piston 21 with diaphragm 26 subjected to the action of a return spring 22 which can partially or completely close the lateral opening 23 a function of the amount of gas present in the fuel fraction enriched in gas flowing along the arrow E in lines 9 and 10.
    A guide needle 29 having a conical end shown in FIG. 3 but not shown in FIG. 2 makes it possible to close off the diaphragm 26 when the return spring 22 is pushed back as far as possible so as to reduce leakage when the lateral opening 23 is totally closed.
    According to Figure 2, the fuel discharged from the control means 20 by the discharge pipe 24 along the arrow F is discharged to the bottom of the recovery tank 3 under the level of liquid fuel already decanted in this tank.
    权利要求:
    Claims (7)
    [1]
    1) Antifoam degassing device for a fuel dispensing device, in particular a biofuel comprising: - a pump for circulating (1) the fuel from a storage tank, - a degassing chamber (2) fed into a mixture of liquid / gaseous fuel via an inlet pipe (7) connected to the outlet of the pump (1) and provided with two outlet pipes, namely a lateral pipe (8) for the degassed liquid fuel and an axial duct (9) for a fraction of gas-enriched fuel; - an atmospheric pressure separation tank (3) connected to the axial outlet duct (9) of the degassing chamber (2) in which the fuel liquid contained in the gas-enriched fraction separates by gravity before being transferred again to the suction side of the pump (1), this separation tank (3) being equipped with a safety orifice (14) allowing 'Evacuatio n to the outside of the separated gases, and - control means (20) connected to the axial outlet duct (9) of the degassing chamber (2) to enable the flow rate of the gas-enriched fraction to be varied. taken by this pipe according to its gas content, characterized in that the control means (20) consist of a control cylinder (27) equipped with: - a front opening (28) connected to the outlet pipe axial (9) of the degassing chamber (2), - a lateral opening (23) connected to a discharge pipe (24) opening into the separation tank (3), and - a piston ( 21) with diaphragm (26) subjected to the action of a return spring (22) and sensitive to the density of the gas-enriched fuel fraction flowing in the axial outlet pipe (9) of the degassing chamber (2), and therefore the amount of gas present in this fraction, to open or close the lateral opening (23 ) of the control cylinder (27) in proportion to this quantity.
    [2]
    2) degassing device according to claim 1, characterized in that the free end (25) of the discharge tube (24) opens at the bottom of the separation tank (3) in the liquid fuel separated by gravity of way to avoid the formation of foam in this tank.
    [3]
    3) Device according to any one of claims 1 and 2, characterized in that the end face of the control cylinder opposite the front opening is equipped with a guide needle (24) of the piston (21) having a conical end for closing the diaphragm (26).
    [4]
    4 °) Device according to any one of claims 1 and 2, characterized in that the discharge pipe (21) is equipped with a filter at its free end (25).
    [5]
    5 °) Device according to any one of claims 1 and 2, characterized in that the discharge pipe (24) is equipped with a gas separator type called "pile of plates" at its free end (25).
    [6]
    6 °) Device according to any one of claims 1 to 5, characterized in that the safety orifice (14) of the separation tank (3) is connected to a system for recovering aspirated fuel vapors.
    [7]
    7 °) Device according to any one of claims 1 to 6, characterized in that the control cylinder (27) and / or the piston (21) diaphragm (26) and / or the axial outlet pipe (9) the degassing chamber are made of brass, stainless steel or a suitable plastic material.
    类似技术:
    公开号 | 公开日 | 专利标题
    BE1019600A5|2012-09-04|ANTI-FOAMING DEGASSING DEVICE FOR A FUEL DELIVERY APPARATUS, PARTICULARLY BIOCARBURANT.
    EP0617227B1|1997-05-28|Air control system for hydropneumatic reservoir
    FR2479870A1|1981-10-09|DEVICE AND METHOD FOR SEPARATING A GAS FROM A FIBER SUSPENSION
    FR2760197A1|1998-09-04|DEVICE FOR BREWING THE CONTENT OF A TANK COMPRISING A BUBBLE ELEVATOR
    EP2110597B1|2011-01-12|Device and method for introducing air in a hydropneumatic tank
    FR2947327A1|2010-12-31|FEEDING SYSTEM FOR FRAGMENT SOLID FUEL HEATING APPARATUS
    EP0895020B1|2009-02-18|Device for introducing air into a hydropneumatic reservoir
    FR2908760A1|2008-05-23|Alcohol e.g. ethanol, based biofuel distributing installation for motor vehicle e.g. truck, has protection units to prevent entry of water in biofuel storage tank and biofuel distributing circuit to detect accidental presence of water
    EP2683458B1|2018-08-01|Cyclonic flow separator
    CA2882191C|2019-10-15|Drainage method and purge collector of a carburation system of a helicopter
    EP0852684B1|2002-10-16|Hydropneumatic anti-hammer tank with an air intake and control device, and air intake method
    BE440430A|
    EP3421114A2|2019-01-02|System for separating and cleaning two constituent gases of a gaseous mixture
    EP3090212B1|2018-01-31|Fog generating device
    CH704667A1|2012-09-28|Separator of immiscible liquids.
    FR3078063A1|2019-08-23|DEGASSING DEVICE FOR A FUEL PUMP ASSEMBLY
    FR2618186A1|1989-01-20|Pump for dispensing a liquid exempt from gas
    BE458846A|
    FR2746090A1|1997-09-19|Liquid hydrocarbon pumping system
    BE526229A|
    OA17216A|2016-04-20|Cyclonic flow separator.
    BE445209A|
    BE573022A|
    BE471568A|
    BE521009A|
    同族专利:
    公开号 | 公开日
    FR2919855A1|2009-02-13|
    IT1394122B1|2012-05-25|
    US7850767B2|2010-12-14|
    CN101362584B|2012-11-14|
    ITTO20080605A1|2009-02-09|
    NL1035787A1|2009-03-30|
    CN101362584A|2009-02-11|
    DE102008034951B4|2015-07-23|
    GB2451727B|2010-02-17|
    FR2919855B1|2009-10-02|
    US20090038478A1|2009-02-12|
    GB0812313D0|2008-08-13|
    NL1035787C2|2009-05-27|
    DE102008034951A1|2009-02-19|
    GB2451727A|2009-02-11|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    NL8204774A|1982-12-09|1984-07-02|Stork Pompen|Petrol pumping station system - has air vents between pressure tank and vent chamber ensuring closure of outlet valve|
    EP0226405A2|1985-12-05|1987-06-24|Gilbarco Inc.|Separating air from liquid fuel|
    WO1996023724A1|1995-01-31|1996-08-08|Graham William Osborne|Forecourt fuel pumps|
    FR2730484A1|1995-02-15|1996-08-14|Schlumberger Ind Sa|DEGASSING SYSTEM FOR A HYDROCARBON DISPENSER|
    US3159310A|1964-03-05|1964-12-01|Arthur W Rafferty|Automatically controlled fluid dispenser|
    FR2636056B1|1988-09-02|1991-05-24|Schlumberger Ind Sa|DEVICE FOR AUTOMATICALLY CONTROLLING A HYDROCARBON LANCE ACCORDING TO THE GAS CONTENT OF THE HYDROCARBON|
    US5501246A|1991-04-26|1996-03-26|Gilbarco Limited|Air/vapour separation device|
    NL9401455A|1994-09-07|1996-04-01|Andre S J Van Coillie En Johan|Self-priming centrifugal pump-vacuum pump combination for, among other things, liquid fuels such as petrol, gasoil, kerozene, etc. with improved deaerator and integrated evaporation recovery option.|
    FR2730384B1|1995-02-14|1997-05-16|Cassan Alain|ARTIFICIAL SAP|
    JP2009119325A|2007-11-12|2009-06-04|Toyota Boshoku Corp|Bubble separator|CN105132205A|2010-12-10|2015-12-09|道康宁公司|Granulated foam control composition|
    CN102161465A|2011-01-20|2011-08-24|罗纳多·麦克尔·伟博|Refueling device|
    DE102013223689A1|2013-09-10|2015-03-12|Vaillant Gmbh|ventilator|
    FR3078063B1|2018-02-16|2020-02-07|Dover Fueling Solutions Uk Limited|DEGASSING DEVICE FOR A FUEL PUMP ASSEMBLY|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    FR0756992A|FR2919855B1|2007-08-08|2007-08-08|ANTI-FOAM DEGAVATION DEVICE FOR A FUEL DELIVERY APPARATUS, PARTICULARLY BIOCARBURANT|
    FR0756992|2007-08-08|
    [返回顶部]