CN1360145A

CN1360145A - Fuel drawing device for fuel tank of automobile

Info

Publication number: CN1360145A
Application number: CN01143836A
Authority: CN
Inventors: 卡里姆·本赫扎尔; 弗雷德里克·维勒拉
Original assignee: Marwal Systems SAS
Current assignee: Marwal Systems SAS
Priority date: 2000-12-14
Filing date: 2001-12-14
Publication date: 2002-07-24
Also published as: US20020081211A1; FR2818321A1; BR0106136A; FR2818321B1; JP2002250257A; DE10160645A1; ITMI20012618A1

Abstract

The present invention provides a device for drawing-off fuel from a motor vehicle tank, the device comprising a drawing-off pump (100) and a fine filter (210) placed upstream from the pump (100), wherein the drawing-off pump (100) is a brush-less pump.

Description

A kind of fuel drawing device that is used for automotive oil tank

Technical field

The present invention relates to be used for extracting the field of the system of fuel from automotive oil tank.

Background technique

At present, many systems that are used for this purpose have been proposed.

Usually, be used for comprising a motor-drive pump that this motor-drive pump extracts fuel from fuel tank or from the supply source that is arranged in fuel tank from the system of automotive oil tank extraction fuel.

The purpose of this supply source is near the amount of exercise of the caused oil of the centrifugal force extraction inlet of pump that the restriction vehicle quickens, slows down or produces when non-directional travels down.

In addition, known fuel extraction system generally includes the fine cleaner of quality that a coarse-grain filtering device that places described pump intake place or filter screen and guarantee to move forward into the oil of engine.

Especially, for example proposed this fuel extraction system in document WO A 99/01658, wherein fine cleaner is positioned at the downstream of motor-drive pump.

Known fuel extraction system can provide favorable service.

Yet they are not entirely satisfactory.

Particularly, although carried out a large amount of research, still do not find the gratifying answer of satisfying various needs in the automotive industry production process.

At first, when fine cleaner is positioned at the downstream of pump, that is, when being positioned on the delivery side of pump pipe, this fine cleaner is placed under the pressure, and therefore its housing must have the mechanical strength that is suitable for bearing the stress that is caused by described pressure.

This causes preferential the selection fine cleaner not to be placed on the downstream of pump, but is placed on the upstream, promptly is positioned at its ingress.This can reduce stress certain on the fine cleaner housing, and suitably also can omit inlet screen under the situation.

Yet the upstream that fine cleaner is placed on pump has increased some other problem that does not solve with satisfactory way as yet.

At first, when fine cleaner is placed in the draw-off pump upstream, any mechanical component of deviating from from pump that pollutes will arrive Carburetor or oil sprayer, and can influence its work.

Secondly, if fine cleaner is placed on the upstream of pump, then sometimes, particularly itself supplied with by a jet pump with one at motor-drive pump, when the supply source that for example receives the inlet flow of directly or indirectly coming from electronic delivery side of pump linked to each other, meeting seriously be stopped up.

The 3rd, when this system starts first, perhaps in fact in this system owing to the low-level of fuel becomes non-priming state (un-primed) afterwards, if fine cleaner is placed in the upstream of this pump, then motor-drive pump must inspiration roughly corresponding to a large amount of air of fine cleaner housing volume.

The 4th, should find out that up to the present the motor-drive pump great majority that are used in the fuel extraction system are rotary gear pumps.The operating principle of this pump is as follows, that is, in the space of liquid suction between two continuous teeth, be sent to one then and transmit the district.

Yet, exist at present rotary gear pump is replaced with the turbine pump that shows real advantage or the strong needs of centrifugal pump.Turbine pump or centrifugal pump are a kind of like this machines, wherein, the rotation of wheel or rotor produces pressure and the velocity conditions of determining how liquid flows in a loop, and flow is the result of balance between the per unit mass resistance energy in the per unit mass useful energy carried by pump and the loop.

In addition, at present, because turbine pump or the intrinsic priming problem of centrifugal pump, many structures of attempting to adopt turbine pump or centrifugal pump to extract fuel are all unsatisfactory.Because the loss of pressure head that produces by filter, be arranged in the system of the upstream of pump at fine cleaner, this problem is outstanding especially.

The 5th, should emphasize that turbine pump or centrifugal pump have one usually and remove pore.When pump stopped, the existence that removes pore on pump case not only caused the inside of pump contaminated, and at least a portion of the fine cleaner housing that is connected thereto is also contaminated.

The 6th, should emphasize, unless take special preventive measure, the existence that removes pore in pump case can cause the positive reserve capacity relevant with pump (positive reserve) by the described danger that removes the pore emptying.

Summary of the invention

An object of the present invention is to improve known fuel extraction system, so as to eliminate describe in detail above in the prior art intrinsic shortcoming.

In specification of the present invention, this purpose is to realize from the device of automotive oil tank extraction fuel by a kind of being used for, this device comprises a draw-off pump and a fine cleaner that places this pump upstream, and this device is characterised in that draw-off pump is a brushless pump (brush-lesspump).

Favourable feature according to the present invention, this draw-off pump are a servocontrol pump (pilot operated pump).

Favourable feature according to the present invention is carried out in the following manner to this draw-off pump servocontrol, that is, make by the approaching required minimum discharge of this device of proper operation that is used for of the fuel flow rate of this pump.

Description of drawings

Other features, objects and advantages of the present invention will reveal by reading following detailed description and the observation accompanying drawing that provides with the indefiniteness way of example, wherein:

Fig. 1 is the vertical sectional view that constitutes the draw-out device of first embodiment of the invention;

Fig. 2 is the similar vertical sectional view that constitutes the device of second embodiment of the invention;

Fig. 3 is the similar vertical sectional view of third embodiment of the invention, the non-coplanar flat that is marked by III-III in the presentation graphs 4.

Fig. 4 is the horizontal cross of passing device shown in Figure 3.

Fig. 5 is the axial longitudinal section that passes the conventional spray pump of prior art.

Fig. 6 is the axial longitudinal section according to jet pump of the present invention.

Fig. 7 is the axial longitudinal section that expression constitutes the jet pump of an advantageous variant of the present invention.

Embodiment

As mentioned above, the inventive system comprises: electronic draw-off pump 100 and one places this pump upstream, promptly at the fine cleaner 210 of its ingress.

The various structures of fine cleaner 210 will be described below in more detail.

In addition, in specification of the present invention, draw-off pump 100 is the electronic pumps of brushless type.This pump is known for those skilled in the art.In fact, it comprises a stator and the rotor with magnet with coil.

It is special in having traditional pump of brush to adopt brush-less pump 100 that it can be limited, the risk that the metal under tearing when brush is mobile on corresponding current collector or the chip foreign matter of plastic materials enter fuel or oil sprayer.

Certainly, when fine cleaner 210 was placed on draw-off pump 100 upstreams rather than downstream, this advantage became more important.

In addition, in specification of the present invention, draw-off pump 100 is preferably a servocontrol pump.

More preferably, the servocontrol of this draw-off pump 100 is undertaken by following mode, that is, make by this pump therefore also the fuel flow rate of the fine cleaner 210 by trip placed on it equal the required flow of normal operation substantially as the function of the instantaneous consumption of engine.

Therefore, when draw-off pump 100 extracts from a supply source of being supplied with from the jet pump of the direct or indirect and next inlet flow of draw-off pump outlet by acceptance, this draw-off pump is carried out servocontrol, make it the fuel flow rate of carrying one to change by following mode, that is, thus by the flow of this draw-off pump by fine cleaner equal substantially the instantaneous consumption of engine add can make the required auxiliary flow of jet pump operation and.(" instantaneous consumption " speech of engine, be meant the actual instantaneous consumption of engine at this, suitably add and to be sent to engine, but this additional flow actual consumption has not returned extraction point (referring to Fig. 1)) so that guarantee any additional flow Qr of its oil sprayer proper operation

On the contrary, when draw-off pump 100 directly when fuel tank takes out fuel, this draw-off pump is carried out servocontrol, make it the flow of carrying one to change in the following manner, that is, thereby equal the instantaneous consumption of engine substantially by the flow of fine cleaner by this pump.(in this case, " instantaneous consumption " speech of engine is meant the significant instant consumption of engine, takes the circumstances into consideration to add and is sent to engine so that guarantee any additional flow Qr of its oil sprayer proper operation, but this additional flow is actual consumption not, has returned extraction point (referring to Fig. 1)).

Therefore, the present invention is used for the flow velocity of restricted passage fine cleaner 210, and thereby is used for loss of pressure head, the pressure in the fine cleaner ingress, the inlet pressure of pump 100 and the obstruction of fine cleaner 210 of restricted passage fine cleaner 210.

Can carry out servocontrol to this draw-off pump 100 in various mode.

Can utilize the pressure or the flow transducer that place the delivery side of pump place that this draw-off pump 100 is carried out servocontrol.In principle, this technology that is used to regulate pump is known for those skilled in the art.Therefore, no longer be elaborated below.Here only remind a bit, that is, this adjusting needs this pump to carry minimum discharge continuously usually, so that guarantee its proper operation.

In another modification, can carry out servocontrol to draw-off pump 100 by a parameter of coming from engine control module, this parameter is represented the required instantaneous consumption of engine.Under this condition, can carry out servocontrol to pump 100 according to control signal based on pressure/flow velocity or electric current/velocity curve.

The following describes the also various embodiments of draw-out device of the present invention shown in the drawings.

Explanation is from the embodiment shown in the accompanying drawing 1.

In Fig. 1, can see the pump 100 of an axis normal.More preferably, it constitutes a turbine pump or centrifugal pump.As mentioned above, this turbine pump or centrifugal pump have one and are suitable for producing the pressure of determining the flow of fuel in a loop and the wheel or the rotor of velocity conditions.

The inlet 110 of pump 100 places the bottom of pump.Outlet 120 is positioned at the top of pump.

Pump 100 has one and removes pore 130, should remove pore 130 towards the outer openings of pump case and be positioned near the bottom of pump 100, and is adjacent on inlet opening 110.

It is the ringwise filter housings 200 of cardinal principle at center with the vertical axis that accompanying drawing 1 also shows one.

This housing 200 is substantially by the toroidal membrane 206 of the level substantially at the cylindrical wall 204 of the coaxial radially inner side of the cylindrical wall 202 of a radial outside, and above-mentioned wall 202 and two bottoms of determining housing 200 respectively and top and 208 definite.

Ring 208 is connected on the top of two cylindrical

next doors

202 and 204 in the mode of sealing.

Ring 206 is connected on the bottom margin in Outer cylindrical next door 202 equally.Yet as following will be explained in more detail, it is free of attachment on the bottom of cylindrical wall 204 of radially inner side.

Housing 200 covers an annular filter 210.Yet, as with reference to the accompanying drawings 3 and 4 the explanation, housing 200 and filter 210 also can be other shapes.

In Fig. 1, pump 100 places the center cavity 220 of filter housings 200, that is, and and in the chamber that the inboard of inner radial wall 204 is determined.

Two annular wall 206,208 of housing 200 each respectively and be provided with between the top of filter 210 and the bottom and be tightly connected.

Therefore, housing 200 has been determined two chambers 240,250, comprises a radially inner side chamber and a radial outside chamber with respect to filter 210 respectively.

Radial outside chamber 240 is as the inlet chamber of housing 200.

Radially inner side chamber 250 is as outlet chamber.

For this purpose, core at housing 200, base circle wall 206 is extended by a seal diaphragm, and determines oral chamber 250 and the cylindrical wall 204 of the radially inner side that interrupts outside dividing plate 207 is parallel to aforementioned barriers 207 by a horizontal wall 209 and extends.

Therefore, two dividing plates 207,209 define a cylindrical chamber 205 that is communicated with the outlet chamber 250 of filter housings.The inlet 110 outside openings of pump, enter described chamber 205.In addition, dividing plate 209 centers on the inlet 110 of filter in the mode of sealing.

The inlet chamber 240 of filter housings can utilize any proper device to be full of from fuel tank 300.

Inlet chamber 240 preferably adopts the jet pump of a traditional common structure to be full of.

Jet pump 260 has a convergent nozzle 262, and this convergent nozzle 262 forms a for example active Venturi tube (driving Venturi) of branch's link 270 fuelings from the outlet that is connected to pump 100.Jet pump 260 also has a suction streams inlet 264 in its bottom; it is protected by an one-way valve 280; described one-way valve 280 for example is a umbrella valve; its directed fuel that allows moves and moves towards internal chamber 240 subsequently from the internal chamber of fuel tank 300 to jet pump 260; prevent that simultaneously fuel from flowing towards opposite direction; that is, reflux to fuel tank 300 from the inside of inlet stage 240 and jet pump 260.

At last, jet pump 260 has a delivery outlet 266, and it leads to the inlet chamber 240 of filter housings 200.

In a variant embodiment, the delivery outlet 266 of jet pump 260 can be extended by a vertical tube, and the top of this vertical tube is positioned near the top of housing 200.Under this condition, need not place one-way valve 280 in the ingress of suction stream 264.Yet this one-way valve can be arranged on the arbitrfary point on housing 200 inwalls of determining inlet chamber 240, during greater than the height in the inlet chamber 240, fuel can be moved with the height in the convenient fuel tank 300 from fuel tank to inlet chamber 240.

Should find out that also in the embodiment shown in fig. 1, the flow fuel Qr that is consumed by engine does not turn back to the inlet chamber 240 of filter through a pipeline 290.

Yet in a modification, the flow Qr that comes from pipeline 290 can be used to supply with jet pump 260, and forms the initiatively convergent nozzle 262 of Venturi tube especially for supplying with.

In another variant embodiment, it is contemplated that and adopt the flow Qr return to supply with the active Venturi tube 262 of jet pump 260, in order to be full of the inlet chamber 240 of filter with the branch flow Qi that obtains from the outlet of pump 100.

The fuel flow rate Qp of inlet 110 suction by pump 100 equals by exporting 220 flow and the Qm+Qr+Qi that carry.

From the outlet 266 of jet pump 260 and the flow Qt that comes equals from branch's link 270 and the flow Qi that comes add from enter the mouth 264 and come flow Qa's and.

In order to be full of filter housings 200, carry flow velocity Qr to add from jet pump 260 and the flow velocity Qt's that comes and the flow velocity Qp that must suck greater than inlet 110 by pump add from housing 200 through being positioned at housing 200 tops, usually on dividing plate 208 remove flow velocity that pore 222 comes Qf's and.

As can be as can be seen from Figure 1, the pore 130 that removes of pump 100 be outwards opened and is entered the center cavity of being determined by the radially inner side surface 204 of filter housings 200 220.

It can also be seen that from Fig. 1 structure of the present invention provides a big just preservation volume (positive reserve volume) for pump 100, it equals the volume of housing 200.

As mentioned above, the pore 222 that removes of filter housings 200 is placed on the top spacer 208, can see inlet chamber 240 inside.

A pipeline 224 is led in described hole 222, this pipeline 224 has the pipeline section 225 of a cardinal principle level leap top spacer 208 and is extended by a vertical pipeline section 226 of cardinal principle, and the vertical pipeline section 226 of described cardinal principle is crossed over the bottom that radially inner side walls 204 drop to chamber 220.Therefore, the end pipeline section 226 of pipeline 224 pump 100 remove pore 130 near have a opening 227 near dividing plate 208.

The height of the opening 227 of pipeline 224 is equal to or less than the height that removes pore 130 of pump 100.

The opening 227 of pipeline 224 is preferably located in removing below the height of pore 130 of pump 100.Equally preferably, the diameter of pipeline 124 is slightly larger than the diameter that removes pore 130 of pump 100 at least.

By these features, pipeline 224 constitutes a syphon tube that is suitable for being present in to inlet chamber 240 conveyings of filter the fuel in the center cavity of being determined by pump case 200 220 when pump 100 stops, thereby prevent that fuel from entering in the pump through removing pore 130, because fuel may make pump 100 be polluted.

When this system is filled for the first time, carry out degasification by

hole

222 and 224 pairs of filter housings of pipeline 200 with two pipeline sections 225,226.Similarly, carry out degasification by 130 pairs of pumps in hole 100.

When pump 100 stopped, housing 200 was determined a static fuel reserve capacity.

In addition, as mentioned above, pipeline 224 forms one and is suitable for siphoning away the syphon tube that is present in the fuel in the center cavity 220 to inlet chamber 240, thereby prevents that described fuel is inhaled in the pump 100 through removing pore 130.

Should see that the siphonal described function that is formed by pipeline 224 is subjected to being present in when pump 100 stops the assistance of the internal pressure in the pump 100.

Fig. 2 represents a variant embodiment of the present invention, the difference of the foregoing description shown in itself and Fig. 1 mainly is, omitted Returning pipe 290, and on the delivery side of pump, be used to supply with on branch's connecting tube 270 of active Venturi tube 262 of jet pump 260 and be provided with a pressure regulator 400 more precisely.

Pressure regulator 400 is designed to, when being opened and allowing during greater than a threshold value, the pressure in pump 100 outlet ports flows to active Venturi tube 262 from the outlet of pump 100, otherwise then close, prevent described flowing when being lower than above-mentioned threshold value with the outlet pressure of convenient pump 100.

Regulator 400 can be realized in various traditional modes.Therefore be not described in detail below.

Yet, should see, regulator 400 preferably includes a housing, this housing covers a flexible diaphragm, described flexible diaphragm is actuated by a specified elastic component (ratedresilient member), so that prop up outlet nozzle, and actuate by the fuel pressure in branch's connecting tube 270 simultaneously, so that remove from described outlet nozzle.

Therefore, when the power that is produced on diaphragm by the pressure in branch's connecting tube 270 during greater than the power that produced by specified elastic component, flexible membrane leaves outlet nozzle, so that allow to flow to active Venturi tube 262, thereby to pump 260 feedings.

On the contrary, when the power that flexible diaphragm produced that is made pressure regulator 40 by the pressure in the pipeline 270 during less than the power that applied by specified elastic component, diaphragm is compressed against on the outlet nozzle, so that prevent jet pump 260 feedings.

The following describes Fig. 3 and embodiment shown in Figure 4.

At first, this embodiment is that with the difference of the foregoing description of describing with reference to figure 1 and Fig. 2 it comprises a pump 100, this pump 100 has a jet pump that is integrally formed with it 260, the active Venturi tube of this jet pump 260 is supplied with through a pressure level of pump 100, and like this location, so that as described, the inlet chamber 240 of filter is supplied with reference to figure 1 and Fig. 2.

Secondly, Fig. 3 and embodiment shown in Figure 4 are that with difference with reference to the foregoing description of figure 1 and Fig. 2 it has a filter 210, and this filter 210 is not the annular around pump 100, but is positioned at the crescent of pump 100 1 sides.

Embodiment shown in Fig. 3 to Fig. 4 has identical substantially feature with above-mentioned with reference to figure 1 and the described embodiment of Fig. 2, particularly have one and supply with and be provided with a filter inlet chamber 240 that removes pore 222 by jet pump 260, remove pore 222 and lead to one and form siphonal pipeline 224, pump 100 remove pore 130 be located at syphon tube 224 opening 227 around.

Following explanation relates to the improvement of specially jet pump 260 being done among the present invention.

These improvement are specially adapted to Fig. 3 and embodiment shown in Figure 4.

The conventional construction of a kind of jet pump of accompanying drawing 5 expressions.

This traditional jet pump also is known as the liquid oil sprayer sometimes, mainly is made of following coaxial component:

A first contraction Venturi tube 262 that is called as the active Venturi tube and under pressure, is supplied to fluid;

One around first Venturi tube and be connected to being called as on the suction port 264 of this device and derive second of Venturi tube (take-up Venturi) and shrink Venturi tube 267;

A cylindrical part 268 that is called as mixer; With

Disperse end 269 as diffuser for one.

Initiatively the throat of Venturi tube 262 is positioned at slightly substantially by on the position of deriving Venturi tube 267 throat upstreams, perhaps in the throat position of deriving Venturi tube 267, and the perhaps position that in fact links to each other with mixer 268 in the throat of derivation Venturi tube.

Initiatively the supply flow of Venturi tube 262 constitutes the active stream of sparger.In this Venturi tube, pressure energy is converted into kinetic energy.Therefore, the active fluid in outlet port forms jet at a high speed.By the turbulent flow exchange of momentum, this jet is taken away some liquid by deriving Venturi tube 267, and the amount of described liquid is determined the flow velocity by the sparger suction.In mixer 268, initiatively stream and the momentum conversion that sucks between the fluid are continuous, and finish when the speed of two jets equates gradually.If ignore energy loss, then this married operation carries out under constant voltage.In end divergent portion 269, the part of mixture kinetic energy is owing to diffusion is transformed into pressure energy.

Known jet pump device work is good.Yet they always are not entirely satisfactory.

Particularly, the applicant finds, when having a very high back pressure in diffuser 269 outlet ports, known jet pump can not be worked under gratifying condition.

An additional purpose of the present invention is, proposes a kind of new jet pump, is that it can get rid of shortcoming of the prior art.

This purpose realizes by a kind of jet pump in the present invention, in this jet pump, derives nozzle 267 and is directly connected on the diffuser, and do not adopt any middle mixer.

Another favourable feature according to the present invention, this jet pump has a big diffuser.

Accompanying drawing 6 shows a main body, this main body has determined that one is the passage at center with axis 0-0, and comprise: first a contraction Venturi tube 262 that is formed on the active Venturi tube that is supplied to fluid under the pressure, formation is around first Venturi tube and be connected to second of derivation Venturi tube on suction port 264 of this device and shrink Venturi tube 267, and the end divergent portion 269 of a diffuser of a formation.

Therefore as mentioned above, jet pump of the present invention has forming derives second of Venturi tube 267 and shrinks Venturi tube and form between the end divergent portion 268 of diffuser feature without any mixer.

In the present invention, initiatively Venturi tube 262 is preferably taper shape, length at 4 millimeters (mm) to the scope of 8mm, and length preferably the diameter cardinal principle with suction port 264 is identical.

The end that forms the active Venturi tube 262 of throat's outlet nozzle is preferably placed in the scope that derives Venturi tube 1mm to 3mm.

Initiatively the angle of convergence B of Venturi tube 262 is preferably at 0 ° to 30 °, and preferably is approximately 5 °.

Deriving Venturi tube 267 is preferably determined by a ring cover.The radius of curvature R 1 of this ring cover 267 is preferably 1mm to 2mm, and is preferably about 1.6mm.The curvature R1 of this described ring cover is preferably tangent with diffuser 269.

In addition, the internal diameter R2 that derives Venturi tube 267 is preferably 1.8mm to 3.0mm at the part place of its minimum, is preferably about 2.0mm to 2.6mm.

In addition, the annular big envelope of deriving Venturi tube 267 preferably has one in 30 ° to 60 ° scopes, preferably be approximately 45 ° angle A.

The end divergent portion that forms diffuser 269 is preferably determined by a conical big envelope.

The length of diffusing tube 269 and is preferably in about 18mm preferably between 10mm to 40mm.

In addition, the convergence angle C of diffusing tube 269 preferably in 2 ° to 10 ° scope, is preferably in about 4 °.

Fig. 7 represents a variant embodiment, and wherein, the main body of jet pump is equipped with a valve 50, and the latter is designed to pressure in active Venturi tube 262 and opens when too high.

Valve 50 is formed in one section pipe 52 that radially extends with respect to axis 0-0 and be connected on the jet pump main body that forms contraction Venturi tube 262 upstreams of Venturi tube initiatively.

Therefore, pipe 52 has determined that leads to the initiatively chamber of Venturi tube 262.Or rather, above-mentioned chamber has determined that one has one and is pressed in valve seat 54 valve member 56, radial outward above it by spring 58.

In modification shown in Figure 7, valve member 56 is mushroom-like substantially, have a tubaeform head and the valve rod that the cross section is less that is seated on the valve seat 54, described valve rod is used to guide valve member a slip in the radial direction with respect to axis 0-0, also is used for supported spring 58 simultaneously.

Certainly, valve 50 can be realized with different ways.

Described valve is designed to pressure in active Venturi tube 262 and valve member 56 is lifted away from valve seat 54 when excessive and is opened, and the pressure in active Venturi tube 262 drops under the definite threshold value and promptly closes.

Certainly, the invention is not restricted to above-mentioned certain embodiments, but can expand to any modification that meets purport of the present invention.

Claims

1. one kind is used for from the device of automotive oil tank extraction fuel, and comprising: a draw-off pump (100) and a fine cleaner (210) that is positioned at this pump (100) upstream, this device is characterised in that draw-off pump (100) is a brush-less pump.

2. device as claimed in claim 1 is characterized in that, this draw-off pump (100) comprises a stator and the rotor with magnet with coil.

3. device as claimed in claim 1 or 2 is characterized in that, this draw-off pump is a servocontrol pump (100).

4. as any one described device in the claim 1 to 3, it is characterized in that, this draw-off pump is carried out servocontrol, so that the flow velocity that carry to change, thus make fuel flow rate by draw-off pump (100) approach this device normally move required, as the minimum of a function flow of the instantaneous consumption of engine.

5. as any one described device in the claim 1 to 4, it is characterized in that, like this this draw-off pump (100) is carried out servocontrol, thereby make the instantaneous consumption that is substantially equal to engine by it by the flow of filter (210).

6. as any one described device in the claim 1 to 4, it is characterized in that, it has a draw-off pump (100) from wherein extracting the reserves of fuel, with one be used to receive from extract delivery side of pump directly or indirectly and the inlet flow rate that comes so that supply with the jet pump of described reserves, described draw-off pump (100) is carried out servocontrol like this, make from the flow that wherein passes through equal substantially the instantaneous consumption of engine add the required auxiliary flow of operation jet pump and.

7. as any one described device in the claim 1 to 6, it is characterized in that this draw-off pump (100) is to be undertaken servo-controlled by pressure or flow transducer.

8. as any one described device in the claim 1 to 6, it is characterized in that this draw-off pump (100) is to be undertaken servo-controlled by a parameter of being come by engine control module.

9. as any one described device in the claim 1 to 8, it is characterized in that,

The housing of filter (200) has one and removes pore (222) at its top;

Draw-off pump (100) also has one and removes pore (130); And

Filter housings (200) is equipped with a pipeline (224), what pipeline (224) had extended housing (200) removes pore (222), and lead to a pump (100) remove the shared chamber (220) of pore, and have one and be positioned at and equate with the height that removes pore (130) of pump (100) or than its low locational opening (227), one of described pipeline (224) formation be suitable for draw-off pump (100) when stopping with near the syphon tube of the fuel tape its opening (227) in filter housings (200).

10. device as claimed in claim 9 is characterized in that, the inlet chamber (240) of filter housings (200) is supplied with and is pressurizeed by a jet pump (260).

11., it is characterized in that draw-off pump (100) is a turbine pump or centrifugal pump as claim 9 or 10 described devices.

12. device as claimed in claim 10 is characterized in that, jet pump (260) is supplied with by branch's link (270) that is connected to the outlet (120) of draw-off pump (100).

13. device as claimed in claim 10 is characterized in that, jet pump (260) is that the Returning pipe (290) of the fuel that do not consumed by engine by a reception is supplied with.

14. as claim 10,12 or 13 described devices, it is characterized in that Returning pipe (29) supply of the fuel that jet pump (260) is not consumed by engine by branch's link (270) of an outlet (120) that is connected to draw-off pump (100) and reception simultaneously.

15., it is characterized in that the suction stream inlet (264) of jet pump (260) is equipped with an one-way valve (280) as any one described device in the claim 10 to 14.

16., it is characterized in that the outlet of jet pump (260) is extended by a vertical tube as any one described device in the claim 10 to 14, the end of described vertical tube is near the top of filter housings (200).

17., it is characterized in that the Returning pipe (290) that receives not the fuel that is consumed by engine leads to the inlet chamber (240) of filter housings (200) as any one described device in the claim 9 to 16.

18. as any one described device in the claim 9 to 17, it is characterized in that, form siphonal pipeline (224) and have a horizontal segment (225) that pore (222) is communicated with that removes with filter housings, be positioned near the vertical generally section in bottom, chamber (220) with a bottom opening (227), described chamber (220) are determined by filter housings (200) and draw-off pump (100) is positioned at wherein.

19., it is characterized in that what the opening (227) that forms siphonal pipeline (224) was positioned at draw-off pump (100) removes below the height of pore (130) as any one described device in the claim 9 to 18.

20. as any one described device in the claim 9 to 19, it is characterized in that, form the diameter that remove pore (130) of the diameter of siphonal pipeline (224) greater than draw-off pump (100).

21. as any one described device in the claim 9 to 20, it is characterized in that, pressure regulator (400) places in the outlet that is connected to draw-off pump (100) and is connected on the pipeline (27) on the active Venturi tube (262) of jet pump (260), and described jet pump (260) is used for the inlet chamber (240) of filter housings is supplied with.

22., it is characterized in that the pore (222) that removes of filter housings leads to its inlet chamber (240) as any one described device in the claim 9 to 21.

23. as any one described device in the claim 9 to 22, it is characterized in that, draw-off pump (100) remove the bottom that pore (130) is arranged in the draw-off pump housing (100) in a chamber (220) of being determined by filter housings (200).

24. any one described device as claim 1 to 23, comprise a jet pump, this jet pump has one and forms first a contraction Venturi tube that is supplied to the active Venturi tube (262) of fluid under pressure, one forms second a contraction Venturi tube that centers on first Venturi tube and be connected to the derivation Venturi tube (267) of suction port, with an end divergent portion (269) as a diffuser, this device is characterised in that, forming one derives second of Venturi tube and shrinks Venturi tube (267) and be directly connected on the end divergent portion (269) as diffuser, and without any middle mixer.