DAMPING DEVICE

Abstract

A damping device, in particular for damping or avoiding pressure surges, such as pulses, in hydraulic supply circuits, preferably in the form of a silencer, having a damping housing which surrounds a damping chamber and has at least one fluid inlet (3) and at least one fluid outlet (5) and a fluid receiving chamber (7) which extends between the fluid inlet and the fluid outlet, wherein, during operation of the device, a fluid flow crosses the damping chamber in a throughflow direction (11), coming from the fluid inlet (3) in the direction of the fluid outlet (5), and wherein at least parts of the fluid receiving chamber (7) extend in at least one extent direction transversely with respect to the throughflow direction (11), is characterized in that the fluid receiving chamber immediately adjoins the fluid inlet (3) and the fluid outlet (5) and in that a guide element (51) is provided in the damping chamber, the fluid flow being able to flow against the guide element and the guide element changing the flow speed of the flow at least in sections.

Claims

1. A damping device, in particular for damping or avoiding pressure surges, such as pulsations, in hydraulic supply circuits, preferably in the form of a silencer, having a damping housing which surrounds a damping chamber and has at least one fluid inlet (3) and at least one fluid outlet (5) and a fluid receiving chamber (7) which extends between the fluid inlet and the fluid outlet, wherein, during operation of the device, a fluid flow crosses the damping chamber in a throughflow direction (11), coming from the fluid inlet (3) in the direction of the fluid outlet (5), and wherein at least parts of the fluid receiving chamber (7) extend in at least one extension direction transversely with respect to the throughflow direction (11), characterized in that the fluid receiving chamber (7) immediately adjoins the fluid inlet (3) and the fluid outlet (5) and in that a guide element (51) is provided in the damping chamber, onto which guide element the fluid flow can flow and which changes the flow speed of the flow in regions.

2. The damping device according to claim 1, characterized in that the fluid receiving chamber is formed by a cavity (7) in the form of a disk with two boundary walls (19, 21) which extend parallel to one another and determine the thickness of the disk, and in that the guide element (51) extends in a continuous manner from one boundary wall (21) to the other boundary wall (19).

3. The damping device according to claim 1, characterized in that the disk-like cavity (7) is formed cylindrical or as a polygon.

4. The damping device according to claim 1, characterized in that parts of the fluid inlet (3) and of the fluid outlet (5) extend in alignment with the boundary walls (19, 21) in the damping housing.

5. The damping device according to claim 1, characterized in that the guide element (51) is arranged in a position aligned with the housing axis (11) extending from the fluid inlet (3) to the fluid outlet (5).

6. The damping device according to claim 1, characterized in that the guide element (51) is arranged at least approximately in the region of half of the length of the housing axis (11) extending from the fluid inlet (3) to the fluid outlet (5).

7. The damping device according to claim 1, characterized in that the guide element (51) is formed as a flow divider with guide surfaces (55) which extend to both sides from a narrow onflow region (53) which faces the fluid inlet (3) and which is located on the housing axis (11).

8. The damping device according to claim 1, characterized in that the fluid inlet (3) and fluid outlet (5) formed as damping housing bores have an identical diameter and said diameter corresponds to the spacing between the two boundary walls (19, 21).

9. The damping device according to claim 1, characterized in that the damping housing is formed in several pieces, with a pot-like base part (13), which receives a disk-like central recess (19) forming part of the cavity (7) with the one boundary wall (19) and also the fluid inlet (3) and the fluid outlet (5), and with a flange-like cover part (15) which, with the other boundary wall (21) as part of an engagement piece (39), engages in a flush manner in the central recess (17) when the cover part (15) is fixed to the base part (13).

10. The damping device according to claim 1, characterized in that the guide element (51) is formed integral with the cover part (15) and projects from the boundary wall (21) formed on the engagement piece (39).

11. The damping device according to claim 1, characterized in that a sealing device is arranged on the engagement piece (39) of the cover part (15), which sealing device is in particular in the form of a sealing ring (43) inserted in a circumferential groove (41), which seals the cavity (7) as a component of the central recess (17) relative to the environment.

12. The damping device according to claim 1, characterized in that the cover part (15) has, lying opposite diametrical to its vertical axis, several penetration bores (33) which, penetrated by fixing screws (35), fix the cover part (15) to the base part (13).

13. The damping device according to claim 1, characterized in that the fixing screws (35), while leaving the region of the fluid inlet (3) and the fluid outlet (5) free, are arranged uniformly along an external circumference on the damping housing, which surrounds the disk-like fluid receiving chamber (7).

14. The damping device according to claim 1, characterized in that a receptacle (47) for a sealing ring is provided at the fluid inlet (3) and/or at the fluid outlet (5) in the damping housing, which sealing ring surrounds the fluid inlet (3) and/or the fluid outlet (5).

15. The damping device according to claim 1, characterized in that, in the manner of a fixing block, the damping housing can be fixed to third components by means of several fixing bolts (45), which surround the region of the fluid inlet (3) and/or of the fluid outlet (5).

Description

[0017] The invention is explained in detail below with reference to an exemplary embodiment depicted in the drawings, in which:

[0018] FIG. 1 shows a simplified sketch-type depiction of the main course of the fluid flow in the fluid receiving chamber of a damping device in the form of a disk silencer;

[0019] FIG. 2 shows a depiction corresponding to FIG. 1 in a damping device according to the invention;

[0020] FIG. 3 shows a perspective oblique view, depicted at approximately half the size of a practical embodiment, of an exemplary embodiment of the damping device according to the invention;

[0021] FIG. 4 shows a top view of the exemplary embodiment of the damping device;

[0022] FIG. 5 shows a longitudinal section of the exemplary embodiment along the cut line V-V of FIG. 4;

[0023] FIG. 6 shows a partial view of only the fluid outlet-comprising connection region of the damping housing of the exemplary embodiment;

[0024] FIG. 7 shows a partial view, corresponding to FIG. 6, of the fluid inlet-comprising connection region;

[0025] FIG. 8 shows a side view of the cover part of the damping housing of the exemplary embodiment;

[0026] FIG. 9 shows a top view of the cover part;

[0027] FIG. 10 shows a sectional depiction of the cover part along the cut line X-X of FIG. 9, and

[0028] FIG. 11 shows a perspective oblique view of the cover part, seen on the bottom side thereof.

[0029] With reference to the attached drawings, the invention is explained on the basis of the example of a so-called disk silencer, the basic construction of which corresponds to subsequently published prior art, as is described in the patent application DE 10 2014 005 822.0. Inside the damping housing of such a silencer, which damping housing is sealed in a tight manner relative to the environment except for a fluid inlet 3 and a fluid outlet 5, said silencer has as a damping chamber a fluid receiving chamber immediately adjoining the fluid inlet 3 and the fluid outlet 5, which is formed by a cavity 7 in the form of a flat circular disk, with only the circular contour thereof being shown and identified with the reference numeral 9 in the simplified, sketch-type depictions of FIGS. 1 and 2. As can be seen, the fluid inlet 3 and the fluid outlet 5 are diametrically opposite one another, with the housing axis 11 which extends between the fluid inlet 3 and the fluid outlet 5 corresponding to the throughflow direction of the fluid flow.

[0030] As can be seen most clearly from FIGS. 3 and 5, the damping housing is formed from two main parts, namely, a base part 13 and a cover part 15. In order to form the disk-shaped cavity 7, the base part 13 has a central recess 17 in the form of a pot, the flat base surface of which forms the bottom boundary wall 19 of the disk-like cavity 7. The top boundary wall 21 determining the thickness of the disk, which extends in a parallel plane to the bottom boundary wall 19, is located at the bottom side of the cover part 15. The fluid inlet 3 and the fluid outlet 5 are aligned with the boundary walls 19 and 21, so that the diameter of the inlet 3 and the outlet 5 respectively corresponds to the disk thickness of the cavity 7. At the fluid inlet 3 and at the fluid outlet 5, the base part 13 has a respective flattening 23 and 25, between which the outer wall of the base part 13 extends in a circular arc shape. The cover part 15 has the same external circumference shape as the base part 13 and, like said base part, it has opposite flattenings 27 and 29, between which the external circumference likewise extends in a circular arc shape. When the cover part 15 is mounted on the base part 13, a step-free outer contour of the damping housing is thus formed, as FIG. 3 shows.

[0031] As is shown by FIG. 5 and also by FIGS. 8 and 9, the cover part 15 has a flange part 31 with fixing holes 33. These are arranged, as FIG. 9 shows, on a partial circular arc outside of the region of the flattenings 27 and 29. In correspondence with the fixing holes 33, threaded bores are provided in the base part 13 as blind holes for fixing screws 35, by means of which the cover part 15 can be fixed to the base part 13 in such a way that the flange part 31 of the cover part 15 overlaps the circumferential edge 37 of the central recess 17 of the base part 13. A circular engagement piece 39 extending downwards from the flange part 31 engages in a fitting manner into the central recess 17 of the base part 13. This engagement is depicted in the screwed state in FIG. 5. For the purpose of sealing the cavity 7 relative to the cover part 15, a sealing ring 43 is used in an annular groove 41 incorporated into the side wall of the engagement piece 39.

[0032] For the attachment of the damping housing to corresponding third components, in the depicted exemplary embodiment, threaded bolts 45 are provided on the flattening 25 of the base part 13 comprising the fluid outlet 5, which threaded bolts are arranged symmetrical to the fluid outlet 5. In addition, a receiving groove 47 for a sealing ring is formed on the opposite flattening 23 at the fluid inlet 3. Fixing bores 49 are also arranged on this flattening 23 for the formation of coupling connections, which fixing bores are in a symmetrical arrangement relative to the fluid inlet 3. It shall be understood that, in a corresponding manner, a sealing arrangement can be provided on the flattening 25 assigned to the fluid outlet 5. The symmetrical housing construction also allows the interchanging of the inlet side and the outlet side, potentially with changed sealing geometries.

[0033] To the extent described above, the exemplary embodiment of the damping device corresponds to the disk silencer as is disclosed as subsequently published prior art in the above-mentioned patent application DE 10 2014 005 822.0. The essential difference of the present invention compared thereto is that a flow guide element 51 is arranged in the disk-shaped cavity 7 forming the fluid receiving chamber. As can be most clearly seen from FIGS. 2, 9 and 11, said flow guide element has a wedge shape such that, starting from a narrow onflow region 53 forming a kind of wedge tip, guide surfaces 55 are formed, which diverge in the throughflow direction indicated with the arrow 57. The guide element 51 thus forms a kind of flow divider for a flow course, as indicated in FIG. 2 in a schematically simplified manner, with side zones 59, in which the flow is partially accelerated, and zones 61 and 63 with comparatively lesser flow speed.

[0034] The guide element 51 is formed integral with the cover part 15 as a projection, which protrudes from the boundary wall 21 on the engagement piece 39. The height of the projection corresponds to the disk thickness of the disk-shaped cavity 7, so that the guide element 51 extends from the boundary wall 21 of the cover part 15 in a continuous manner up to the boundary wall 19 on the base part 13. The guide element 51 is centrally arranged in the cavity 7, so that the pointed onflow region 53 is situated on the housing axis 11 which extends from the fluid inlet 3 to the fluid outlet 5 approximately at half the length thereof between the inlet 3 and the outlet 5. Instead of the wedge shape shown in the present example, a different shape can be provided for the guide element 51, with which the guide surfaces produce a flow profile which is suitable for high-efficiency damping in the disk-shaped cavity 7 without having an adverse effect on the flow resistance.

[0035] It shall be understood that, instead of the depicted integral formation of the guide element 51 as a projection on the boundary wall 21 of the cover part 15, a separate installation part can be provided as the guide element. Furthermore, more than one guide element could be provided, which could potentially have different shapes and sizes. The depicted positioning of the guide element 51 on the housing axis 11 is also not mandatory.