CN1112989A - Aggregate for feeding fuel from a supply tank to an internal combustion engine of a motor vehicle - Google Patents

Abstract

Sypplying device for feeding fuel form standby box to internal-combustion engine, which avoids a dead space generated on the basis of throttle filling, and avoid an unfavorable influence of a forcibly feeding characteristic in a second feed passage. A feed passage 20 having a flow-out opening 25, on an end part opposite to the flow-out opening 25, has a cross sectional surface arranged within an end part positioned in a radial direction outside an impeller 5 smaller comparing with a cross sectional surface arranged on an end part of a flow-out side. The cross sectional surface is continuously increased in a direction of the flow-out opening 25 passing the feed passage 20, and is constantly continued to an end part having a flow-out opening 25 of the feed passage 20 after achieving a regulated value.

Description

Aggregate for feeding fuel from a supply tank to an internal combustion engine of a motor vehicle

The present invention relates to a kind of supplier of fuel being given internal-combustion engine from the fuel tank force feed, this supplier forms by this way, in pump chamber, be provided with rotatable tabular rotor, on the side face of this rotor, dispose a plurality of along the outward extending blade of radial direction, above-mentioned pump chamber is separated by each the pump chamber wall that abuts against aforementioned rotor axial end face side respectively, these pump chamber walls are in opposed facing position, in each above-mentioned blade scope of rotor, dispose the supply passage of offering in the face of rotor, this supply passage is by with the rotor axis being the determined part annulus in center, and the inlet towards aforementioned pump chamber direction that is disposed since the first pump chamber wall extends to the outlet that communicates with aforementioned pump chamber that the second pump chamber wall disposes.

The supplier of this form is a technique known, for example the U.S. the 4th, 403, No. 910 disclosed structures of patent specification, in this known supplier, the rotor that is driven supply pump by drive motor makes its rotation, and rotating tabular rotor has axially two relative end faces in the cylindric pump chamber, and having a commentaries on classics hat that can dispose a plurality of blades, these blades are configured in this spaced reciprocally along the rotor circumference direction and take turns and label.On the pump chamber wall that pump chamber is separated from the end face side, dispose with blade tip height towards axial direction, be that the center is the supply passage that the part ring-type is extended with the rotor rotational axis.The inlet that this supply passage is provided with from pump chamber begins to lead to outlet, and under this occasion, inlet is configured in by on formed first locular wall of the suction cover of canned pump, and outlet is arranged on formed second locular wall of middle casing that motor uses.When this known supply pump turned round, fuel passed through inlet and sucks pump chamber, continued to pass through supply passage again, according to the ripple swap between the circuit fuel in fuel that quickens in rotor and the supply passage, made the fuel pressure increase and was sent to outlet.From then on begin just fuel IC engine supply continuously.The fuel, the particularly high occasion of bubble composition in high-temperature fuel that suck, needed fuel quantity does not diminish in the inflow supply passage in order to make, and the supply passage of aforementioned known fuel feed pump is covering the transverse section that the end that enters the mouth is provided with increase.The transverse section of this increase of supply passage can be arranged on and have towards the inlet of pump chamber, is arranged in the supply passage on the suction cover, also can be arranged in the supply passage that is arranged at an opposite side on the middle casing.But this structure has following shortcoming.That is, particularly because supply pump has hydraulic pressure circulation transverse section little between the supply passage that is arranged in the inlet scope, therefore, the supply passage that has outlet is very difficult in the filling at outlet scope place.In this case, inferior passage filling can cause loss, causes that the situations such as adverse current of eddy current, fuel take place.The adverse current of this eddy current and fuel can hinder the rapid formation of circular flow in the supply passage, and the efficient of supply pump is reduced.The deterioration of this efficient is caused by the second supply passage extrusion packing, except that above-mentioned known supplier, particularly is easy to generate this degradation in efficiency when making supply pump with circulating pump.In this circulating pump, because fuel only is to be finished by the impeller assembly that rotor is provided with from the feedway that inlet is arranged to flowing of the supply passage that outlet is arranged, therefore, particularly under the high-temperature fuel situation, this known circulating pump efficient can not meet the demands.

The present invention is intended to overcome above-mentioned defective, and it is improved to provide a kind of supplier to above-mentioned form to carry out, and can avoid the dead band that caused by the minimizing of filling, and prevents to produce in second supply passage supplier of inappropriate Heat Effects on Pressure Characteristic.

For addressing the above problem, in structure of the present invention, the supply passage that has aforementioned outlet has, and in the end of the opposite side of aforementioned outlet, compare for a short time with the transverse section that the end, outflow side is provided with, and is configured in transverse section in the aforementioned blade radius direction outboard end scope.This transverse section is continuous increase of direction of leading to aforementioned outlet along supply passage, and after arriving specified value, the mode certain with the transverse section forms always continuously, up to the end of the above-mentioned outlet of supply passage band.

Give the device of internal-combustion engine with fuel from the fuel tank force feed according to provided by the present invention, comparing with supplier in the past has the following advantages.That is, be in the supply passage in the face of the entry position, the place has less transverse section in the inlet scope, and at first, extend in the mode of continuous increase towards Way out this transverse section, arrives after the cross-section face amount of regulation, is extended to the outlet port by certain mode again.Thus, the fuel in the supply passage of taking out of mouthful can not flow into because of the extruding of rotor, thereby guarantees this supply passage complete filling.Under this occasion, can avoid hollow area or dead band, avoid causing the eddy current that loses and the adverse current of fuel reliably.As a result,, realized the early stage formation of circular flow, especially when the force feed high-temperature fuel, the efficient of supply pump has been played good effect because aforementioned supply passage is by complete filling.In this case, because being continuous increase by the channel width and the degree of depth, the increase of the supply passage transverse section of taking out of mouthful realizes that therefore, this point is just more favourable.In addition, the increase of this transverse section accounts for 20～60 ° angular range of supply passage bearing of trend greatly, also can bring other advantage thus.This situation has guaranteed that also supply passage fully fills.And the just size that the transverse section increases in this scope, for all being fit to each necessary condition that is arranged on the supply passage that epitrochanterian overcurrent transverse section is associated.

Fig. 1 is the structure diagram of supplier of the present invention that has the supply pump of circulating pump form.

Fig. 2 is the sectional view of supplier shown in Figure 1.

Fig. 3 is the enlarged view of supply passage shown in Figure 2 towards the entrance region of pump chamber direction.

Fig. 4 is the sectional view in supply passage shown in Figure 3 zone.

Among the figure: 1 is supplier, the 3rd, and supply pump, the 5th, blade, the 7th, rotor, the 8th, housing, 9 is axle, the 11st, pump chamber, the 12nd, suction cover, 13,16 is the pump chamber wall, and 14 is middle casing, and 18,20 is supply passage, the 21st, suction pipe, 23 are inlet, 25 are outlet, the 27th, discharge tube, the 29th, ring.

Hereinafter, narrate embodiments of the invention in conjunction with the accompanying drawings.

Supplier 1 shown in Figure 1 is used for fuel sent with pressure from the automotive oil tank (not shown) and is defeated by the internal-combustion engine (not shown).This supplier 1 is provided with the supply pump 3 of making the circulating pump form.Be provided with rotor 7 in the supply pump 3, rotor 7 has several along the overhanging blade 5 of radial direction.Rotor 7 by axle 9 by the motor (not shown) drive make its revolution, motor (not shown) be configured in the common general housing 8 of supply pump 3 in.Being preferably made cylindric rotating rotor 7 is configured in the pump chamber 11.Rotor 7 axially, the both sides of pump chamber 11 are limited by side pump chamber wall.The first pump chamber wall 13 in two pump chamber walls is configured on the suction cover 12, and suction cover 12 closes supply pump 13 with respect to the outside, and the second pump chamber wall 16 is configured on the middle casing 14, and middle casing 14 separates supply pump 3 and drive motor.In this case, on two pump chamber walls 13,16, be respectively arranged with 1 groove, these two grooves are that about 300 ° annular slot is made at the center with the rotational axis of rotor 7 respectively, and respectively with rotor 7, the first pump chamber wall 13 on second supply passage 20 that is provided with on first supply passage the 18, the 2nd pump chamber wall 16 that is provided with form simultaneously.The relative supply passage 18,20 of configuration, from the one end, promptly from be arranged on suction cover 12 on the suction port 23 that matches of suction pipe 21 begin, one through to its other end, i.e. set outlet 25 places on the middle casing 14.Like this, the fuel of discharging from supply passage 18,20 continuously passes the housing 8 of supplier 1, and passes through discharge tube 27 and discharge from supplier 1.

In Fig. 2, show the structure of second supply passage 20 that on middle casing 14, is provided with.Second supply passage 20 extends to outlet 25 from the scope of facing the inlet 23 that is disposed on first supply passage 18.Outlet 25 and pump chamber 11 and the housing parts that surrounds above-mentioned supplier motor are connected.Second supply passage 20 as shown in Figures 3 and 4.In the inlet 23 pairing scopes of in first supply passage, 18 scopes, being prepared, with the end of an outlet opposite side of 25, the scope that has with the blade outer circumferential face is a starting point, the part that cross section diminishes.This cross-section increases continuously towards outlet 25 on supply passage 20 length directions.Rotor 7 in the foregoing description is made closed rotor.In the rotor of this structure, the ring 29 that centers on the rotor outer circumferential face is together with each other the end of a side outwardly with blade 5 radial directions.But,, also can select rotor is made the open type rotor of no ring 29 for this structure.

The continuous process that increases in transverse section that exports second supply passage 20 of 25 opposite side ends clearly shows by amplifying at Fig. 3 and Fig. 4.Fig. 3 shows the continuous configuration process that increases of width of supply passage 20.In this case, this passage is increased by width and part that the transverse section that causes increases is approximately extended 20 °～60 ° angular ranges (β) of whole second supply passage 20.The increase of this transverse section is carried out along rotor 7 gyratory directions.After this, the transverse section of supply passage is until outlet one side end of second supply passage 20 all keeps constant.

In Fig. 4, demonstrated with respect to the channel depth that is arranged on the second pump chamber wall, 16 rectangular second supply passages 20 on the middle casing 14 in continuous increase.And structure shown in Figure 4 can replace structure shown in Figure 3.It is that starting point is approximately extended 20 °～60 ° angular range (β) of whole second supply passage 20 to flowing out a side end direction that supply passage 20 channel depth increase scope also can be got to export 25 opposite side ends.In this case, the increase of channel depth becomes the extension plane of inclination of α angle to implement with whole relatively passage.This angle [alpha], the difference of length, the terminal passageway degree of depth and top channel depth by the transverse section transition just can be tried to achieve.The eddy current that forms when this plane of inclination can be avoided flowing into second supply passage 20 makes it become the laminar flow shape and flows into, thereby makes second supply passage 20 be in the state of filling fully.This filling completely can be avoided the decline of fuel pressure under the vapor pressure, thereby further avoids forming bubble in the dead band, and the circular flow in the passage 20 is formed rapidly.

During supplier 1 running, fuel flows in the pump chamber 11 of supply pump 3 with inlet 23 by sucking cover 21, at first is filled in first supply passage 18 with non-squeezed state.The a part of fuel that flows in first supply passage 18 is extruded by the impeller clearance that is provided with on the rotor 7, flows in second supply passage 20, at first, is filled in the zone of small channel transverse section of second supply passage 20, promptly exports the end of 25 opposite sides.Carry out continuously by flowing of first supply passage 18 and second supply passage 20, the fuel that increases gradually flows into second supply passage 20 from first supply passage 18, the result, two supply passages 18,20 are filled equally by the continuous fluid power effect of rotor 7, produce identical fuel pressure simultaneously.From this situation, two supply passages have equal passage transverse section.

When using supplier of the present invention,, therefore, can avoid the flow losses that cause by second supply passage, 20 incomplete fillings because the channel geometries of second supply passage 20 of the position, 23 opposite that enters the mouth is improved.Particularly the effect of being fallen by the vapor pressure downforce and the bubble that produces in high-temperature fuel are avoided.And make supply passage 20 complete filling that have outlet 25, guaranteed the formation of pressure in the supply passage, thereby circular flow is formed rapidly.

Claims (5)

1, a kind of supplier of fuel being given internal-combustion engine from the fuel tank force feed, it is provided with rotatable tabular rotor (7) in pump chamber (11), on the side face of this rotor (7), dispose along the overhanging a plurality of blades (5) of radial direction, aforesaid pump chamber (11) is separated by each the pump chamber wall that abuts against aforementioned rotor (7) axial end side respectively, these pump chamber walls are in opposed facing position, in the scope of each blade (5) of rotor (7), dispose the supply passage of offering in the face of rotor (7), this supply passage, by the axis with rotor (7) is center and definite part annulus, inlet (23) since the setting of the first pump chamber wall (13) towards aforementioned pump chamber (11) direction, extend to the second pump chamber wall (16) and go up the outlet (25) that communicates with aforementioned pump chamber (11) that is provided with, it is characterized in that, the supply passage (20) that has aforementioned outlet (25) has: in the end of the opposite side of aforementioned outlet (25), compare little with the transverse section that the end of outflow side is provided with, and be configured in transverse section in aforementioned blade (5) the radial direction outboard end scope, this transverse section is continuous increase of direction of leading to aforementioned outlet (25) along supply passage, after arriving specified value, the mode certain with the transverse section continues formation always, up to an end that has above-mentioned outlet (25) of supply passage (20).

2, the supplier of putting down in writing according to claim 1 is characterized in that, the continuous increase of supply passage (20) transverse section realizes by the continuous increase of channel width and/or channel depth.

3, according to claim 1 or 2 supplieies of being put down in writing, it is characterized in that, the scope of the transition transverse section between the certain supply passage in smallest passage transverse section that is provided with on the opposite side end of the discharge section of second supply passage (20) and transverse section is approximately extended 20 °～60 ° angular range (β) of the supply passage (20) of whole annulus defined.

4, the supplier of putting down in writing according to claim 2, it is characterized in that, the increase of aforementioned transverse section, be according to continuous increase with respect to the rectangular channel depth of the second pump chamber wall (16), and the mode that forms the plane of inclination with predetermined angular (α) implements, and aforementioned (α) angle is tried to achieve according to the length of transverse section transition range and the difference of maximum supply passage transverse section and minimum supply passage transverse section.

5, the supplier of putting down in writing according to claim 1, it is characterized in that, vane rotor (7) is by being installed in the inner drive motor rotary driving of common general housing (8), this drive motor is separated itself and supply pump (3) by the middle casing (14) that has the second pump chamber wall (16), the second pump chamber wall (16) is connected with the inner chamber that surrounds drive motor of aforementioned housing (8) all the time by connecting the outlet (25) of aforementioned middle casing (14).

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