Centrifugal pump for delivering liquids in a motor vehicle

Abstract

In a centrifugal pump for delivering liquids in a motor vehicle, annular webs project into a gap seal between a housing part and a cover disc of a rotor. The webs are arranged on both components of the housing part and of the cover disc and delimit chambers which accelerate, decelerate and divert a flow. In this way, the gap seal has a high throttling action.

Claims

1. A centrifugal pump (1) for delivering liquids in a motor vehicle, comprising: a housing (8) delimiting an intake duct (10) and an outlet duct (11); a driven rotor (9) configured to rotate in the housing (8) and having: rotor blades (14) that project from a supporting disk (13) of the driven rotor (9), and a cover disk (15) that connects free ends of the rotor blades (14); a housing part (16) of the housing (8) arranged opposite the cover disk (15); a gap seal (17) arranged between the cover disc (15) and the housing part (16); and a plurality of projecting annular webs (22-24, 28, 29) arranged in the gap seal (17), at least one of the plurality of projecting annular webs (22, 23) being arranged on the cover disk (15) and at least one of the plurality of projecting annular webs (24) being arranged on the housing part (16), the at least one annular web (24) arranged on the housing part (16) being offset relative to the at least one annular web (22, 23) arranged on the cover disk (15), wherein the plurality of projecting annular webs (22-24) each cover half a height of the gap seal (17).

2. The centrifugal pump as claimed in claim 1, wherein annular webs (22-24) arranged opposite one another each project over half the height of the gap seal (17).

3. The centrifugal pump as claimed in claim 1, wherein the plurality of annular webs (22-24, 28, 29) delimit a plurality of chambers (25, 26) in the gap seal (17), the chambers having different cross sections.

4. The centrifugal pump as claimed in claim 1, wherein the annular webs (22-24, 28, 29) taper toward the free end thereof.

5. The centrifugal pump as claimed in claim 1, wherein at least one of the components of the housing part (16) or of the cover disk (15) is manufactured from plastic.

6. A centrifugal pump (1) for delivering liquids in a motor vehicle, comprising: a housing (8) delimiting an intake duct (10) and an outlet duct (11); a driven rotor (9) configured to rotate in the housing (8) and having: rotor blades (14) that project from a supporting disk (13) of the driven rotor (9), and a cover disk (15) that connects free ends of the rotor blades (14); a housing part (16) of the housing (8) arranged opposite the cover disk (15); a gap seal (17) arranged between the cover disc (15) and the housing part (16); and a plurality of projecting annular webs (22-24, 28, 29) arranged in the gap seal (17), at least one of the plurality of projecting annular webs (22, 23) being arranged on the cover disk (15) and at least one of the plurality of projecting annular webs (24) being arranged on the housing part (16), the at least one annular web (24) arranged on the housing part (16) being offset relative to the at least one annular web (22, 23) arranged on the cover disk (15), wherein the gap seal (17) has a first annular duct (18) proximal to the intake duct (10) and a second annular duct (19) proximal to the outlet duct (11), said first and second annular ducts being arranged perpendicularly to the plane of the supporting disk (13) of the rotor (9), the first and second annular ducts (18, 19) being connected to one another by a first transverse duct (20) and the annular webs (22-24) project into the first transverse duct (20).

7. The centrifugal pump as claimed in claim 6, wherein the first transverse duct (20) connecting the first and second annular ducts (18, 19) to one another slopes relative to the plane of the supporting disk (13) of the rotor (9), and the annular webs (22-24) projecting into the first transverse duct (20) are arranged perpendicularly to the plane of the supporting disk (13) of the rotor (9).

8. The centrifugal pump as claimed in claim 7, wherein at least one of the first and second annular ducts (18) is connected to the intake duct (10) or the outlet duct (11) by a second transverse duct (21).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention allows numerous embodiments. To further clarify the basic principles thereof, one of the embodiments is shown in the drawings and described below. In the drawings:

(2) FIG. 1 shows a centrifugal pump according to the invention with adjoining components of a motor vehicle; and

(3) FIG. 2 shows a section through a pump stage of the centrifugal pump from FIG. 1.

DETAILED DESCRIPTION OF THE PRESENTLY PREFERRED EMBODIMENTS

(4) FIG. 1 shows a centrifugal pump 1 having a pump stage 3 driven by an electric motor 2. The centrifugal pump 1 draws in liquid from a reservoir 5 via an intake line 4 and delivers it to a consuming unit 7 via a delivery line 6.

(5) FIG. 2 shows a section through the pump stage 3 of the centrifugal pump 1 from FIG. 1. The pump stage 3 has a housing 8 with a rotor 9 arranged rotatably therein, which is driven by the electric motor 2 from FIG. 1. The housing 8 has an intake duct 10, which is connected to the intake line 4, and an outlet duct 11, which is connected to the delivery line 6. The rotor 9 has a supporting disk 13 arranged for conjoint rotation on a shaft 12 of the electric motor 2 and having rotor blades 14 projecting therefrom. Free ends of radially outer rotor blades 14 are connected to a cover disk 15. A gap seal 17 is arranged between the cover disk 15 and a housing part 16 of the housing which lies opposite the cover disk 15.

(6) The gap seal 17 has two annular ducts 18, 19 arranged concentrically with respect to the axis of rotation of the rotor and perpendicularly to the supporting disk 13. A first transverse duct 20 is arranged between the annular ducts 18, 19. The gap seal 17 furthermore has a second transverse duct 21, which is arranged at the intake duct 10. The first transverse duct 20 is arranged so as to slope relative to the plane of the supporting disk 13. The cover disk 15 and the housing part 16 lying opposite the cover disk 15 have webs 22-24, which each project into the gap seal 17 and are arranged offsets relative to one another. The webs 22-24 each cover half the height of the gap seal 17 and delimit chambers 25, 26 with different cross sections. Another chamber 27 adjoining the second transverse duct 21 is delimited by webs 28, 29 on the cover disk 15 and by a flat wall of the housing part 16.

(7) Thus, while there have shown and described and pointed out fundamental novel features of the invention as applied to a preferred embodiment thereof, it will be understood that various omissions and substitutions and changes in the form and details of the devices illustrated, and in their operation, may be made by those skilled in the art without departing from the spirit of the invention. For example, it is expressly intended that all combinations of those elements and/or method steps which perform substantially the same function in substantially the same way to achieve the same results are within the scope of the invention. Moreover, it should be recognized that structures and/or elements and/or method steps shown and/or described in connection with any disclosed form or embodiment of the invention may be incorporated in any other disclosed or described or suggested form or embodiment as a general matter of design choice. It is the intention, therefore, to be limited only as indicated by the scope of the claims appended hereto.