Fluid handling – Self-proportioning or correlating systems – Self-controlled branched flow systems
Patent
1996-08-12
1998-01-06
Ferensic, Denise L.
Fluid handling
Self-proportioning or correlating systems
Self-controlled branched flow systems
137508, 137628, G05D 1100, F16K 3112, F16K 3136
Patent
active
057043868
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
The present invention relates to a multistage regulating valve with a cylinder and a regulating piston guided therein. The piston can be impacted on one side by a regulating pressure and on the other side by the force of a restoring element, for example a compression spring. Depending on the regulating pressure, the piston exposes at least one opening in the wall of the cylinder not at all, partially, or completely, and thus either interrupts a flow or pressure connection or creates one partially or completely.
Such valves are known from hydraulic control technology. For example, there are valves that have one input and two outputs (or vice verse) whereby the input can be optionally connected with one of the outputs and this connection is produced by holes or the like in the regulating piston. This is done so that optionally, depending on the displacement of the regulating piston, one or the other of the outputs is connected with the input, whereby possibly additional displacement positions of the regulating piston can be provided in which for example none of the outputs or both are connected with the input.
The piston is moved via the action of a regulating pressure acting against one end of the piston, while the other end is impacted by a restoring element, generally a compression spring. The effective piston cross section impacted by the regulating pressure, the spring constant of the compression spring, and the arrangement of the openings and connecting channels is selected so that at very specific ranges of the regulating pressure, very specific desired connections are produced between the inputs and outputs. It is understood that such valves can theoretically have a large number of different inputs and outputs, with the connections being made in the desired pressure range. In addition, the connection for the regulating pressure can be used as the input or one of the inputs of the valve.
In addition to switching and interrupting certain connections in hydraulic or pneumatic systems, always as a function of the value of a regulating pressure, often a certain characteristic of the regulating behavior or the response of the regulating piston is desired. An example of this would be a sudden change in the value of the spring constant of the restoring element, when for example the regulating piston has reached a specific predetermined position. Such a change in the spring constant can be achieved by at least two different compression springs serving as restoring elements, one of which is held back by a stop and only comes into engagement with the piston when the latter has reached the predetermined position. However, the assembly of such multistage restoring elements is sometimes space-consuming and complex and permits only a relatively limited variation in the regulating characteristics.
In contrast to this prior art, the present invention is based on the goal of providing a multistage regulating valve which permits, over a wide range, a change in the regulating characteristic as a function of the position of the regulating piston even without using a plurality of restoring elements.
This goal is achieved by virtue of the fact that the piston consists of at least two partial pistons each impacted by the regulating pressure. A first partial piston is impacted by the force of the restoring element with a dog which connects the partial pistons with one another in such fashion that, at least in a certain position range of the partial pistons, the second partial piston also experiences a restoring force from the restoring element through the first partial piston and the dog. The cylinder has at least one stop for the second partial piston. The stop limits the movement of the second partial piston under the influence of the regulating pressure and against the action of the restoring element, while the first partial piston, unaffected by this stop, remains movable against the restoring element during a further pressure increase.
The dog therefore always operates in only on
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Lehmann Uwe
Stich Bodo
Wilhelm Maik
Ferensic Denise L.
Kim Joanne
Mercedes-Benz AG
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