Damping element

Details Damping element Damping element

1999-08-24

2001-06-12

Morris, Lesley D. (Department: 3752)

Pipes and tubular conduits

With pressure compensators

Reexamination Certificate

active

06244299

ABSTRACT:

DISCLOSURE OF THE INVENTION
The invention relates to a damping element for a conduit conducting a gaseous or liquid working medium through which pressure pulsations are applied.
Damping elements, also called tuners, of the type addressed here are known. They serve, inter alia, in hydraulic hoses for damping pulsations. These pulsations in hydraulic or pneumatic systems arise from the fact that the working medium is conveyed by pumps or pumping systems which introduce periodically recurring pressure fluctuations into the system. Examples of such pumps or pumping systems are vane pumps or radial piston pumps, but also diaphragm pumps, such as are used in the automobile industry in steering servo systems and brake systems, and as fuel injection pumps. The pulsations of the working medium cause the conduits, mostly hoses or pipes, conveying the medium to execute vibrations which, for their part, can incite the surrounding air to execute vibrations and lead to an undesired generation of noise in the system. It is therefore necessary to develop elements which dampen the pulsations in hydraulic or pneumatic systems. These damping elements are constructed as small hollow bodies through which flow can occur, for example, as tubular elements which are arranged inside the conduit conducting the working medium. In this case, these damping elements are held with the aid of fastening elements which have fastening nipples onto which the damping elements are fitted. However, this means that the full cross-section of the damping element is not available for the working medium to flow through, and this is associated with a pressure loss in the conduit and an increase in the temperature of the working medium. Both lead to a poor energy balance of the entire system. It is therefore an object of the invention to create a damping element of the type mentioned at the beginning which eliminates the disadvantages named here.
A damping element having the features of the present invention can achieve the foregoing. It is distinguished in that it can be plugged into the fastening element which will anchor the damping element. Consequently, the full cross-sectional surface is available to be flowed through by the working medium flowing through the fastening element and through the damping element. Pressure losses and temperature increases are therefore virtually excluded.
In the simplest exemplary embodiment, the inner surface of the opening of the fastening element has no contour, so that the connection between the fastening element and damping element comes about solely from the static friction between the two. It is particularly economical to realize this variant.
In a preferred exemplary embodiment, it is provided that the inner side of the opening of the fastening element, into which the damping element is plugged, is provided with elevations and/or depressions which enhance the frictional grip between the fastening element and damping element. This ensures a very high functional reliability.
Moreover, an exemplary embodiment is preferred in which the elevations and/or depressions are arranged on the inner surface of the opening of the fastening element in an annular or spiral shape. This refinement ensures a stronger frictional grip between the fastening element and the damping element, thus enhancing the grip between the two elements.
A further exemplary embodiment of the damping element is distinguished in that the push-in contour on the inner surface of the opening of the fastening element is provided with teeth (similar to the surface of a file or rasp) by means of which the damping element is securely held.
Further, refinements are set forth in the following description.


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