Abstract
A multiple-flow vane cell pump which includes at least two points (openings) along the rotational direction of the rotor, at which there is essentially the same pressure during operation and which are spaced apart from inlets and outlets and are hydraulically connected to each other (connection).
Claims
1.-10. (canceled)
11. A multiple-flow vane cell pump comprising: a plurality of spaced apart inlets; a plurality of spaced apart outlets; a rotor including at least two openings formed along a rotational direction of the rotor, wherein at the openings there is essentially a same pressure during operation and the at least two openings are spaced apart from the inlets and the outlets, and wherein the at least two openings are hydraulically connected to each other by at least one connection.
12. The multiple-flow vane cell pump according to claim 11, wherein the at least two openings are bores or grooves in one of the rotor, a stroke ring, or at least one side plate.
13. The multiple-flow vane cell pump according to claim 12, wherein the at least two openings are a same distance from an axis of the rotor.
14. The multiple-flow vane cell pump according to claim 12, wherein at least one of the bores or the grooves extends radially and/or at least one of the at least two openings is formed axially.
15. The multiple-flow vane cell pump according to claim 14, wherein at least one of the at least one bores, the grooves and the at least two openings is formed in a linear manner.
16. The multiple-flow vane cell pump according claim 11, wherein the at least one connection extends at least partially in a circumferential direction.
17. The multiple-flow vane cell pump according to claim 11, wherein the at least one connection surrounds a pin.
18. The multiple-flow vane cell pump according to claim 11, wherein at least one side plate is closed by a lid.
19. The multiple-flow vane cell pump according to claim 11, wherein the pump further comprises a pot-shaped housing.
20. The multiple-flow vane cell pump according to claim 11, wherein the at least one connection is produced by an additive manufacturing method.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In the following, the invention is explained in more detail by reference to exemplary embodiments depicted in the figures. These show as follows:
[0017] FIG. 1 a hydraulic schematic diagram of a first embodiment of the pump according to the invention.
[0018] FIG. 2 a cross-sectional view of a second embodiment of the pump according to the invention.
[0019] FIG. 3 a longitudinal sectional view of a pump according to the invention, similar to the first embodiment.
[0020] FIG. 4 a cross-sectional view of a third embodiment of the pump according to the invention, and
[0021] FIG. 5 a cross-sectional view of a fourth embodiment of the pump according to the invention.
DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION
[0022] As is apparent in FIG. 1, the vane cell pump 10, which is a two-flow vane cell pump in the illustrated case, conveys hydraulic fluid from a reservoir 12. For this purpose, two lines 14 to the respective suction or inlet regions 16 are formed, and, in a similar manner, two lines 18, which are connected to each other, extend from the respective outlet region 20.
[0023] The structure of the vane cell pump 10 is explained in more detail below with reference to FIG. 2. However, it is apparent in FIG. 1 that regions or cells that are spaced apart from the inlet 16 and the outlet 20 and that are diametrically opposite each other owing to the configuration of the pump as a two-flow vane cell pump are hydraulically connected to each other by means of the shown connection 26. In the case shown, openings 28 are formed for this purpose in a side plate (40; cf. FIG. 3). The arrow in the region of the rotor indicates the direction of rotation.
[0024] In FIG. 2, the direction of rotation is opposite to that of FIG. 1. FIG. 2 shows a three-flow vane cell pump 10, which comprises, in a known manner, a rotor 30 with slits 32, in which one vane 34 each is accommodated in a movable manner in the radial direction. In accordance with the three-flow configuration, the embodiment of FIG. 2 comprises three inlets 16 and three outlets 20. These are formed in a stroke ring 36 in a known manner. In accordance with the embodiments shown in FIG. 1, points which are spaced apart from inlets 16 and outlets 18 and at which there is, in theory, the same pressure are provided with openings 28 in order to hydraulically connect them to each other. According to the three-flow embodiment of the vane cell pump shown in FIG. 2, said openings 28 are spaced apart from each other by 120°. The preferred measure according to which the openings have the same distance from the rotor axis is moreover apparent.
[0025] As is apparent in FIG. 3, a connection 26, which is schematically drawn in FIG. 1, is configured in one of the side plates 40 in the form of a radially extending groove and connects the two openings 28 to each other. The side plate 40 that is provided with the groove is closed by a lid 42, and the lid 42 is accommodated in an essentially pot-shaped housing 44, together with the two side plates 40, the rotor 30 and the stroke ring 36.
[0026] Although this is not shown in the three-flow pump provided in FIG. 2, the connection according to the invention can also be configured in the form of radial connections in the rotor 30 or, in the stroke ring 36, in the form of a connection extending in a circumferential direction between three cells, as is described below with regard to a two-flow vane cell pump and illustrated in FIGS. 4 and 5.
[0027] In FIG. 4, a vane cell pump 10 that is similar to the embodiment of FIG. 1 is provided, in which, however, the connection 26 is configured for the aforedescribed pressure compensation in the rotor 30 and in particular also the shaft 38 thereof. The connection 26 is advantageously configured as a continuous bore that extends in a linear manner. In order to have complete pressure compensation in the region of all of the cells, the connection would have to be repeated for each pair of cells.
[0028] Finally, a further embodiment is apparent in FIG. 5, in which the connection 26 is configured in the stroke ring 36. As is apparent in FIG. 5, the connection 26 is configured over a wide course in a manner concentric to the outer contour of the stroke ring 36, and is connected to the respective cell of the pump by means of a short radial connection. In the bottom part on the left of FIG. 5, it is apparent that said connection 26 can be configured to surround a pin which is shown as a circle.
