KR20100051657A - Side channel pump for conveying fuel in a motor vehicle - Google Patents

Abstract

The invention relates to a side channel pump (2) for conveying fuel having a flow divider disposed in an impeller (4). The flow divider divides blade chambers of the impeller (4) into individual partial chambers (11, 12). Flow dividers are also disposed in housing parts (5, 6) opposing the impeller (4) having partial ring-shaped channels (15, 16) radially encompassing each other. The flow dividers in the impeller (4) and in the housing parts (5, 6) are at a distance from each other in order to allow cross flow between the conveyance chambers (9, 10) formed by the partial chambers (11, 12) and the partial ring-shaped channels (15, 16). The side channel pump (2) thereby has a high efficiency and particularly low radial dimensions.

Description

SIDE CHANNEL PUMP FOR CONVEYING FUEL IN A MOTOR VEHICLE}

The present invention is a side channel pump for transporting fuel in a vehicle, comprising an impeller rotatably disposed between two casing parts, the inlet being disposed in one of the casing parts. And two transport chambers having outlets disposed in the other casing parts, the transport chambers being guided from the inlet to the outlet and concentrically surrounding each other, wherein the transport chambers are part-annular channels disposed in the casing parts. And a ring of guide blades defining a blade chamber, wherein the ring relates to a side channel pump disposed on two end faces of the impeller.

Such side channel pumps are known, for example, from DE 103 27 573 A1. In this side channel pump, the impeller has two rings of guide blades, which guide blades define the blade chamber. The blade chamber of the radially inner ring is separated from the radially outer blade chamber by an intermediate ring. The intermediate ring is guided to the casing part, resulting in the formation of a gap seal between the conveying chambers concentrically surrounding each other. Also in each case the ring has a different number of guide blades. Therefore, it is necessary to close the transport chamber to prevent the circulating flow generated in one transport chamber from flowing out to the other transport chamber and generating turbulence in the guide blades. The two conveying chambers which concentrically enclose each other are connected in parallel, making it possible in particular to generate a high volume flow.

However, a disadvantage of the known side channel pump is that it has a very large size. In addition, as a result of contamination or wear, higher pressures may occur in one transport chamber than in another.

This leads to the low efficiency of the side channel pump.

The problem on which the present invention is based is to develop a side channel pump of the type mentioned at the outset so that it has a particularly high efficiency and a particularly small size in the radial direction.

According to the invention, this problem is achieved by the impeller and the casing parts being spaced apart from each other between the conveying chambers concentrically surrounding each other.

As a result of this configuration, separation of the conveying chambers concentrically surrounding each other is avoided. Spaced apart the impeller from the casing part allows the conveyed fuel to flow from the transport chamber with high pressure into the transport chamber with low pressure. The pressure equalization generated thereby leads to the particularly high efficiency of the side channel pump according to the invention. With the present invention, the reduction in efficiency due to wear or contamination of the transport chamber is kept particularly low. In addition, with the present invention, leakage partitions between the conveying chambers are avoided, so that the conveying chambers can be arranged particularly close to each other. This leads to a particularly compact configuration and in particular a small radial size of the side channel pump according to the invention.

In each case, when the flow divider subdivides the blade chamber into two subchambers disposed next to each other in the radial direction, it contributes to an additional increase in the efficiency of the side channel pump according to the invention. Occurs. The flow divider makes it possible to route the flow into a separate transport chamber. In addition, as a result of the configuration, the radially inner and radially outer conveying chambers also have the same number of guide blades arranged in a straight line with each other.

Thus, turbulence when the conveyed fuel overflows can thereby be kept particularly low.

According to another advantageous embodiment of the invention, when the subchambers disposed next to each other in the radial direction are connected to each other on the end face of the impeller, the outflow of the conveyed fuel has a particularly low turbulence.

According to an advantageous embodiment of the invention, when the flow divider is spaced apart from the end face of the impeller, the structural cost for connecting the subchambers can be kept particularly low.

The efficiency of the side channel pump according to the invention when the partially annular channel has an additional flow divider opposite the impeller's flow divider, and when the additional flow divider is spaced from the side of the casing part opposite the impeller. A contribution to the further increase of.

When the flow divider is made of one part with an impeller or casing part, the assembly of the side channel pump according to the invention is particularly simple.

According to the invention, there is provided a side channel pump having a particularly high efficiency and a particularly small size in the radial direction.

The present invention is capable of numerous embodiments. To clarify its basic principle, one of these embodiments is shown in the drawings and described below. In the drawing:
1 shows a partial cross section of a fuel pump with a pump stage according to the invention configured as a side channel pump,
FIG. 2 shows a greatly enlarged partial region of the side channel pump of FIG. 1 with two conveying chambers concentrically surrounding each other, FIG.
FIG. 3 shows an enlarged partial view of the side channel pump in a cross-sectional view along line III-III of FIG. 2.

1 shows a fuel pump with a side channel pump 2 driven by an electric motor 1. The side channel pump 2 has an impeller 4 which is fixedly arranged on the shaft 3 of the electric motor 1 in terms of rotation. The impeller 4 is arranged between two casing parts 5, 6 which are kept spaced apart from each other by a spacer ring 7. The jacket 8 of the fuel pump prestresses the casing parts 5, 6 to the spacer ring 7. The side channel pump 2 has a radially inner conveying chamber 9 and a radially outer conveying chamber 10. The conveying chambers 9, 10, in each case, have rings located opposite each other of the guide blades 13, 14 defining the subchambers 11, 12, and the casing parts 5, 6. Is provided in the annular channel (15, 16) disposed. The partially annular channels 15, 16 extend from the inlet 17 arranged in one of the casing parts 5 to the outlet 18 arranged in the other casing part 6. In addition, the subchambers 11, 12 of the transport chambers 9, 10, which are located opposite each other, are connected to each other in the impeller 4.

During the rotation of the impeller 4, fuel is sucked through the inlet 17 and dispensed into two conveying chambers 9, 10. In this case, the fuel flows axially through the impeller 4 and is carried to the outlet 18. As a result, the fuel is delivered via the electric motor 1 to the connecting part 19 of the fuel pump. A forward-flow line, not shown, can be connected to the connecting part 19.

FIG. 2 shows the radially outer partial region of the side channel pump 2 of FIG. 1, which is greatly enlarged, at the outlet 18. In this case, it can be seen that the connection of the subchambers 11, 12 located opposite each other is made as a result of their overlapping. In addition, the conveying chambers 9, 10 are connected to each other in a separating plane between the impeller 4 and the casing parts 5, 6. The flow dividers 20, 21 are arranged in the impeller 4 and the partially annular channels 15, 16 and route the flow of conveyed fuel in the respective delivery chambers 9, 10. However, since the flow dividers 20, 21 are spaced apart from the plane of separation between the impeller 4 and the casing parts 5, 6, from one transport chamber 9, 10 to the other transport chamber 10, 9. Furnace flow is possible. The conveying chambers 9, 10 are thereby arranged in particular close to each other so that the side channel pump 2 has a particularly small radial size.

FIG. 3 shows an enlarged, radially outer partial region of the impeller 4 in a cross-sectional view of the side channel pump 2 of FIG. 2 along the line III-III. It can be seen here that the two transport chambers 9, 10 have the same number of subchambers 11, 12. As a result, the flow divider 20 disposed in the impeller has a separate subchamber 11 of the conveying chambers 9, 10 radially surrounding each other in the blade chambers 22 formed by the guide blades 13, 14. Subdivided into 12). This ensures that fuel flowing from one transport chamber 9, 10 into the other transport chamber 10, 9 is supplied upstream of each guide blade 13, 14 to the intended position.

1: electric motor
2: side channel pump
3: shaft
4: impeller
5: casing parts
6: casing parts
7: spacer ring
8: fuel pump jacket
9: conveying chamber
10: conveying chamber
11: subchamber
12: subchamber
13: guide blade
14: guide blade
15: partially annular channel
16: part-annular channel
17: entrance
18: exit
19: connecting parts
20: flow divider
21: flow divider
22: blade chamber

Claims (6)

A side channel pump for fuel delivery of a vehicle, comprising: an impeller rotatably disposed between two casing parts, an inlet disposed on one of the casing parts and an outlet disposed on the other casing part, the inlet Two conveying chambers guided from the outlet to the outlet and concentrically surrounding each other, the conveying chambers having a ring of guide blades defining a blade chamber and a partially annular channel disposed in the casing part, the ring having two of the impeller A side channel pump, disposed on the two end faces,
Side channel pump, characterized in that the impeller (4) and the casing parts (5, 6) are spaced apart from each other between the conveying chambers (9, 10) concentrically surrounding each other. The method of claim 1,
Side channel pump, characterized in that the flow divider (20) subdivides the blade chamber (22) into two subchambers (11, 12) arranged next to each other in the radial direction. The method according to claim 1 or 2,
Side channel pumps, characterized in that the subchambers (11, 12) arranged next to each other in the radial direction are connected to each other at the end face of the impeller (4). The method according to any of the preceding claims,
The flow divider (20) is a side channel pump, characterized in that spaced from the end face of the impeller (4). The method according to any of the preceding claims,
The partially annular channels 15, 16 have an additional flow divider 21 opposite the flow divider 20 of the impeller 4, and the additional flow divider 21 has a casing opposite the impeller 4. Side channel pump, characterized in that it is spaced from the side of the component (5, 6). The method according to any of the preceding claims,
A side channel pump, characterized in that the flow divider (20, 21) is made of one part with the impeller (4) and / or the casing part (5, 6).

Images