WO2006128762A1

WO2006128762A1 - Delivery unit

Info

Publication number: WO2006128762A1
Application number: PCT/EP2006/061741
Authority: WO
Inventors: Fevzi Yildirim; Ulrich Mueller; Benjin Luo
Original assignee: Robert Bosch Gmbh
Priority date: 2005-06-01
Filing date: 2006-04-21
Publication date: 2006-12-07
Also published as: US20080193297A1; DE102005025132A1; JP2008542612A; EP1891333A1

Abstract

Prior art delivery units have an impeller, which rotates inside a pump chamber and which has, on at least one face, a ring of blades situated at a distance from one another in the peripheral direction. These blades each have a front side leading in the peripheral direction and a rear side trailing in the peripheral direction. A blade chamber is formed between the individual blades. In order to improve the inflowing and outflowing into/out of the chambers, the blades have, on their edge formed by the face and the rear side, a bezel extending continuously from radially inward to radially outward. A drawback exists in that the edge formed by the face and the front side does not have a bevel. As a result, the flow experiences an increased flow resistance when flowing out of the blade chamber. In the inventive delivery unit, the efficiency is improved by providing more inflow surface or outflow surface to the flow. To this end, the invention provides that at least one blade (5.1) has, radially outward on the front side (30) and/or radially inward on the rear side (31) in the area of the faces (20.1, 20.2), at least one triangular, oval-shaped, circular or sector of a circle-shaped slope (38).

Description

Fδrderaggregat

State of the art

The invention relates to a delivery unit according to the preamble of the main claim.

It is already known a delivery unit from US 6,454,520 Bl, with a circulating in a pump chamber impeller having at least one end face a ring of circumferentially spaced apart blades, each leading in the circumferential direction front and a trailing back in the direction of rotation have and with an annular conveying channel of

Cooperate pump chamber. Between the individual blades, a vane chamber is formed in each case. The liquid enters radially inside with respect to a rotational axis of the impeller from the delivery channel in the blade chambers and radially outward again from the chambers in the delivery channel. To improve the inflow and outflow into the chambers or out of these, the blades have on their edge formed by a front side and the rear side of a radially inwardly to radially outwardly extending chamfer.

The disadvantage is that the edge formed by the front and the front has no chamfer. As a result, the flow experiences an increased flow resistance when flowing out of the blade chamber. If the edge formed from the front and the front side would also have a continuous chamfer, as at the edge formed by the front side and the rear side, the wall thickness of the blade measured in the circumferential direction would have to be increased, which would also increase the resistance of the flow.

Advantages of the invention

The delivery unit according to the invention with the characterizing features of the main claim has the advantage that in a simple way an improvement in the efficiency of the delivery unit by reducing the

Flow resistance is achieved by having at least one blade radially outward at the front and / or radially inward on the back in the region of the end faces at least one triangular, oval-shaped, circular or circular cut-shaped inclined surface. In this way, the flow is given more area at the radially inner and radially outer ends of the blades to be below a predetermined one Einströmwinkel enter into the blade chambers or to leave the blade chambers at a predetermined discharge angle.

The measures listed in the dependent claims advantageous refinements and improvements of the main claim

Delivery units possible.

It is particularly advantageous if the inclined surface of the blade is formed such that a fictitious oblique cut extends from the one end of the blade with decreasing depth in the direction of the other end of the blade, since this embodiment is particularly easy to produce by injection molding.

It is furthermore advantageous that the oblique surface has the oblique surface defining edges which extend in a different direction with respect to the adjacent edges of the adjacent surfaces.

It is very advantageous that the oblique surface increases an inflow or outflow surface formed between the blades and opens into the chamber, since in this way the efficiency of the delivery unit is increased.

Advantageously, the inclined surface is executed either flat or curved.

It is also advantageous if the radial extent of the inclined surface with respect to a pump axis is smaller than the radial extent of the blade.

drawing

Embodiments of the invention are shown in simplified form in the drawing and explained in more detail in the following description. 2 shows an impeller of this delivery unit, FIG. 3 shows a blade according to the invention in accordance with a first exemplary embodiment, FIG. 4 shows a three-dimensional view of a blade according to FIG. 3 with triangular inclined surfaces, FIG 3 shows a three-dimensional view of a blade according to FIG. 3 with circular cut-out oblique surfaces, FIG. 6 shows a three-dimensional view of a blade according to FIG. 3 with oval-shaped or circular inclined surfaces, FIG 8 shows a blade according to the invention according to a second embodiment, FIG. 9 shows a sectional view along the line IX-IX in FIG. 8 and FIG. 10 shows a three-dimensional view of a blade according to FIG. 8 with triangular inclined surfaces.

Description of the embodiments

Fig.l shows a delivery unit in which an inventive design of the blades can find application.

The delivery unit according to the invention serves to convey a liquid, for example fuel, from a storage container, for example via a pressure line to an internal combustion engine.

The inventively designed delivery unit has a pump housing 1, the one

Pump part 2 and a motor part 3 has.

The erfϊndungsgemäße delivery unit is a flow pump, such as a peripheral pump or a side channel pump.

The pump part 2 has a pump chamber 4, in which an impeller 5 rotates about a rotationally symmetrical pump axis 8. The impeller 5 is driven by an actuator 9 provided in the motor part 3 via a drive shaft 10. The actuator 8 is for example an electric motor and is arranged in an engine compartment 7 of the engine part 3.

An area upstream of the pump chamber 4 is referred to as a suction side, and an area downstream of the pump chamber 4 is referred to as a pressure side of the unit.

The pump chamber 4 has a pump chamber inlet 11 and a

Pump chamber outlet 12 on. The pump chamber 4 is bounded by two opposite in the direction of the pump axis 8 end walls, a first end wall 15 and a second end wall 16, wherein in the first end wall 15 of the pump chamber inlet 11 and in the second end wall 16 of the pump chamber outlet - A -

12 is provided, and in the radial direction with respect to the pump axis 8 of an annular wall 17th

The impeller 5 has, for example, at both end faces 20.1,20.2 a ring of circumferentially spaced-apart blades 5.1. Between

Blades 5.1 are formed chambers 5.2. For example, the blades 5.1 and the chambers 5.2 of the first end face 20.1 of the impeller 5 are mirror-symmetrically provided on the second end face 20.2. The respective opposing chambers 5.2 of the two end faces 20.1,20.2 of the impeller 5 are connected to each other, for example via a connection opening 26. The chambers are radially outward

5.2, for example, closed by a circumferential ring 5.3 is provided at the radially outer ends of the blades 5.1.

In the end walls 15,16 annular conveying channels 14 are provided, which are arranged in the radial region of the blades 5.1.

The first end wall 15 is for example part of a suction cover 18 and the second end wall 16 and the annular wall 17 are for example part of a pressure cover 19. In the suction cover 18, an inlet channel 22 is provided, which opens via the pump chamber inlet 11 into the pump chamber 4, wherein the pump chamber

4 is fluidly connected to the engine compartment 7 via the pump chamber outlet 12 and an outlet channel 23 provided in the pressure lid 19.

The pressure lid 19 has a passage opening 24. The drive shaft 10, which is mechanically coupled to the actuator 9, protrudes from the engine compartment 7 through the engine

Through hole 24 of the pressure cap 19 in the pump chamber. 4

The axial width of the pump chamber 4 is greater than the axial width of the impeller 5, so that an axial gap 20 of about ten to thirty micrometers between the impeller 5 and the end walls 15,16 consists. The difference between the width of the pump chamber 4 and the width of the impeller 5 is defined as Gesamtaxialspalt.

The impeller 5 is inserted, for example, on the projecting into the pump chamber 4 drive shaft 10, for which the impeller 5 has an impeller opening 25 into which the drive shaft 10 at least protrudes in order to form-fit with the impeller and / or to be positively connected. The impeller 5 is mounted on the drive shaft 10, for example, such that it is axially movable between the first end wall 15 and the second end wall 16.

The delivery unit sucks, for example, liquid from a reservoir 32 via the inlet channel 22, the pump chamber inlet 11 in the pump chamber 4 and calls it via the pump chamber outlet 12, the output channel 23, the engine compartment 7 of the motor part of the pump housing 1 and a pressure line 33, for example, to an internal combustion engine 34. In the pressure line 33, for example, a check valve 35 is provided to maintain a predetermined pressure in the pressure line 33 after switching off the delivery unit.

2 shows an impeller from the prior art, which is carried out according to the invention according to the following figures 3-9.

In the case of the impeller according to FIG. 2, the parts which remain the same or function with respect to the delivery unit according to FIG. 1 are identified by the same reference numerals.

3 shows a detail of an inventively designed impeller according to a first embodiment with a blade according to the invention.

In the impeller according to Figure 3 are compared to the delivery unit according to Fig.l and the impeller according to Fig.2 consistent or equivalent parts characterized by the same reference numerals.

The blades 5.1 have seen in a circumferential direction 29 of the impeller 5, a front 30 and a back 31 on. To the end faces 20.1,20.2 of the impeller 5 towards the blades 5.1 have a front side 32nd

According to the invention, at least one blade 5.1 has at least one inclined surface 38 radially on the outside of the front side 30 and / or radially inside on the rear side 31 in the region of the front side 32. The oblique surface 38 is provided radially outside in the region of a front edge 30.1 formed by the front side 30 and the front side 32 of the blade 5.1 and / or radially inside in the region of a trailing edge 31.1 formed by the rear side 31 and the front side 32 of the blade 5.1.

According to a first embodiment, the inclined surface 38 of the blade 5.1 is formed such that a fictitious oblique cut extends starting from the one end of the blade 5.1 with decreasing depth T in the radial direction of the other end of the blade 5.1. The fictitious oblique cut at the front edge 30.1 or trailing edge 31.1 of the blade 5.1 runs only over a partial length of the front edge 30.1 or

Trailing edge 31.1, so that the radial extent of the inclined surface 38 with respect to the pump axis 8 is smaller than the radial extent of the blade 5.1.

The inclined surface 38 is a partial surface of the front side 30 and the rear side 31, respectively.

The inclined surface 38 has the inclined surface 38 delimiting edges 39 which extend opposite to the adjacent edges of the adjacent surfaces 30,31,32 in another direction (Figure 4). The inclined surface 38 thereby faces the front

30 and 31 back to an inclination. The inclined surface 38 thus extends obliquely with respect to the front 30, the back 31 and the end face 32 of the blade 5.1 and thus in a different spatial direction than the surface of the front 30, the back

31 and the end face 32 of the blade 5.1.

The inclined surface 38 is formed such that the flow resistance during inflow and outflow formed between the blades 5.1 and opening into the chamber 5.2

Inflow or outflow increased.

According to the invention, the inclined surface 38 is, for example, triangular (FIG. 3, FIG. 4), circular-section-shaped (FIG. 5), oval, circular (FIG. 6) or similar. The inclined surface 38 may be flat or curved.

4 shows an inventively designed blade according to the first embodiment with a triangular inclined surface. In the blade according to FIG. 4, the parts which are identical or functionally identical to the delivery unit according to FIG. 1 and the impeller according to FIG. 2 and FIG. 3 are identified by the same reference numerals.

The blades 5.1 are viewed in the radial direction with respect to the pump axis

8 executed, for example, V-shaped or swept. The two legs of the V-shaped blades 5.1 are inclined with respect to the pump axis 8. The blades 5.1 have at the radially inner end of the trailing edge 31.1 and at the radially outer end of the leading edge 30.1, for example, triangular inclined surfaces 38. The triangular inclined surfaces 38 are formed by three edges 39. For example, the blade has 5.1 5.1 to both end faces 20.1,20.2 of the impeller 5 out according to the invention inclined surfaces 38th

5 shows an inventively designed blade according to the first embodiment with a circular cut-shaped inclined surface.

In the case of the blade according to FIG. 5, the parts which are identical or functionally identical to the delivery unit according to FIG. 1 and the impeller according to FIGS. 2 to 4 are identified by the same reference numerals.

FIG. 6 shows an inventive blade according to the first exemplary embodiment with an oval-shaped or circular oblique surface.

In the case of the blade according to FIG. 6, the parts which are the same or have the same effect relative to the delivery unit according to FIG. 1 and the impeller according to FIGS. 2 to 5 are identified by the same reference numerals.

7 shows a sectional view of the impeller along the line VII-VII in Figure 3 according to the first embodiment.

In the impeller according to FIG. 7, the parts which are the same as or the same as those of the previous figures are identified by the same reference numerals.

The fluid flows from the delivery channels 14 radially inward into the chambers 5.2 of the impeller 5 at an inflow angle E and radially outward under a Outflow angle A out of the chambers 5.2 out into the delivery channels 14. The inflow angle E and the outflow angle A are formed differently by the inclined surfaces 38, wherein the inflow angle E is greater than the outflow angle A.

In the pump chamber 4 of the delivery unit creates a spiral circulation flow, which experiences a flow resistance when flowing into the chambers 5.2 and when flowing out of the chambers 5.2 out. By providing the inclined surfaces 38, a larger inflow and outflow surface is provided and thus significantly reduces the flow resistance. The inclined surfaces 38 increase the inflow angle E and the outflow angle A compared to the prior art. By increasing the outflow angle A local vacuum areas are avoided at the blade edges 30.1,31.1 or at least reduced. In this way, the promotion of fuel at high temperature (so-called hot bit circulation) is improved.

8 shows a section of an impeller according to the invention according to a second embodiment.

In the impeller according to FIG. 8, the parts which are the same or function the same as those of the previous figures are identified by the same reference numerals.

The blades 5.1 according to the second embodiment are formed as in the first embodiment, V-shaped or swept. The blades 5.1 according to the second embodiment differ from the blades of the first

Embodiment is that they have a radially outwardly trailing in the direction of rotation 29 section 5.4 and radially inside a vorlaufilenden in the direction of rotation 29 section 5.5. The trailing section 5.4 and the leading section 5.5 are, for example, angled relative to a central section 5.6, which is provided between the sections 5.4.5.5. As a result of this angled embodiment of the blades 5.1, it is achieved that the outflow angle A (FIG. 9) is further increased, thereby avoiding or at least reducing negative pressure areas at the blade edges 30.1, 31.1, which further improves the delivery of hot gasoline. Furthermore, an improvement of the inflow and outflow from the pump chamber 5.2 is achieved, so that the flow losses are reduced. Also, the blades 5.1 according to the second embodiment have radially outward on the front side 30 and / or radially inward on the rear side 31 in the region of the end face 32 at least one inclined surface 38 which are formed as described in the first embodiment.

9 shows a sectional view of the impeller along the line EX-EX in Figure 8 according to the second embodiment.

In the impeller according to FIG. 9, the parts which are the same as or the same as those of the previous figures are identified by the same reference numerals.

The angling of the blade 5.1 in the sections 5, 5, 5, 5 runs over the entire width B of the running wheel 5.

10 shows a three-dimensional view of a blade with triangular inclined surfaces according to the second embodiment.

Claims

claims

1. delivery unit for conveying fuel from a reservoir to the internal combustion engine of a motor vehicle, with a circulating in a pump chamber impeller on at least one end face a wreath of in

Having circumferential direction with spaced-apart blades, each having a leading edge in the circumferential direction and a trailing in the direction of rotation rear, characterized in that at least one blade (5.1) radially outward on the front side (30) and / or radially inwardly on the back ( 31) in the region of the end faces (20.1, 20.2) has at least one triangular, oval-shaped, circular or circular-cut-shaped inclined surface (38).

2. delivery unit according to claim 1, characterized in that the inclined surface (38) of the blade (5.1) is formed such that a fictitious oblique section of the one

End of the blade (5.1), starting with decreasing depth (T) in the radial direction of the other end of the blade (5.1).

3. delivery unit according to claim 1, characterized in that the inclined surface (38) has the oblique surface bounding edges (39) opposite to the adjacent

Edges of the adjacent surfaces (30,31,32) extend in a different direction.

4. delivery unit according to claim 1, characterized in that the inclined surface (38) is formed such that it increases between the blades (5.1) formed and in the chamber (5.2) opening inflow or outflow.

5. delivery unit according to claim 1, characterized in that the inclined surface (38) is curved or flat.

6. conveying unit according to claim 1, characterized in that the inclined surface (38) is a partial surface of the front side (30) or the back (31) and to the surface of the front (30) and rear (31) has a slope.

7. delivery unit according to claim 1, characterized in that the radial

Extension of the inclined surface (38) with respect to a pump axis (8) is smaller than the radial extent of the blade (5.1).