Rotary expansible chamber devices – Working chamber surface expressed mathematically
Reexamination Certificate
2001-10-12
2002-12-17
Vrablik, John J. (Department: 3748)
Rotary expansible chamber devices
Working chamber surface expressed mathematically
Reexamination Certificate
active
06494698
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention concerns a rotary piston machine as defined by the elements of the independent claim. A rotory piston machine for use in a pump, a compressor, a turbine or motor must exhibit properties which allow its design to be precisely calculated. In dependence on the application and the fluid dynamic properties of the medium being transported or pumped, the design of the power and blocking components must be effected in such a way that effective transport performance is obtained. Moreover, the production of these components must be done by means of a tool whose proper design is important in order to minimise production costs.
In a conventional rotary piston machine (DE P 42 41 320.6; DE G 92 18 694.7; PCT/DE 92/01025), all lines of the cycloid component and the central component extending transverse to and defining the operating direction pass through the point of intersection of the axes of rotation. This limits the expansion and compression behavior of the working chambers and therefore adaptation of the rotary piston machine to various working media and fields of application. FR 838,270,GB 1,099,085 and DE 2639760 all disclose rotory piston machines having a power component and a blocking component. The power component and blocking component teeth mutually engage and are configured to have shapes generally of a conical section type (i.e. conical, circular, parabolic, ellipsoidal, or hyperbolic). These teeth shapes of prior art have the disadvantage that a plurality of contact lines occur between the blocking and power components per chamber during operation. This causes reduced efficiency in fluid transport through the chambers and complicates calculation of the pressure and flow properties of the fluid during the course of operation.
In view of these disadvantages of prior art it is the underlying purpose of the present invention to design a rotory piston machine for a pump, a compressor, a turbine or a motor having a structure which facilitates precise calculation of the flow properties of the medium in the chambers during operation in dependence on the fluid dynamic properties of that medium and which permits efficient design of a tool for producing the power and blocking components.
SUMMARY OF THE INVENTION
This purpose is achieved in accordance with the invention with a rotory piston machine having a power component whose teeth are shaped using a cycloid generator. The cycloid shape not only allows precise calculation of the properties of the rotory piston machine but also produces one line of contact per chamber between the power and blocking components which propagates monotonically through the chamber during the course of operation thereby providing efficient operation of the pump and precise determination of the action of the pump on the transport response of the fluid. The intake and output behavior of the working chambers is determined by the phase shift, to thereby reduce undesired back-flow or mixing between the intake and output working media.
According to an advantageous embodiment of the invention, the phase shift from the inner to the outer diameter is at least 360° such that the working chamber is closed off from the surroundings at least at one angular position of the first or second component.
According to a further advantageous embodiment of the invention, the amplitudes of the cycloids forming the operating surface of the cycloid component differ from one another. This allows additional freedom in designing the behavior of the working chambers.
According to a further advantageous embodiment of the invention, the working chambers are separated by a positive fit between the sides and tops of the opposing component teeth. Due to the different number of teeth, the tooth tops of the control component advance along the sides of the cycloid component teeth to essentially eliminate fluid back-flow. In addition, the control component can thereby be driven by the cycloids.
According to a further advantageous embodiment of the invention, there is no positive fit between the cycloids forming the operating surfaces of the cycloid component and the control component. The machine is then a flow machine whose characteristics are defined by the impulse and mass of the working medium. Moreover, sensitive media having characteristics impaired by compression may also be used as the working medium.
According to a further advantageous embodiment of the invention, the control channel for input of the working medium is disposed at the outer diameter, and the control channel for output of the working medium is disposed on the inner diameter of the tooth structures. During turbine or motor operation, the impulse and mass forces generated by the working medium are aligned with the direction of displacement of the working chamber. This reduces leakage losses and improves efficiency.
According to a further advantageous embodiment of the invention, the working positions of the axes of rotation of the components can be changed independently of one another. In accordance with the invention, additional pairs of toothed disk structures can be incorporated. At least one of the components has toothed gearing on its back side which cooperate with an additional rotating component having single or double teeth. This requires a radial seal between the enclosing casing and these rotating components. Drive and output may be effected in a conventional manner using shafts or toothed wheels connected to the rotating components or disposed thereon and cooperating with additional drive or output means. By changing the working positions of the rotary axes, the volume change in one component of the rotary piston machine can be advanced or retarded with respect to the other to permit graduated operation through connection of the working chambers or for mixing.
According to an advantageous embodiment of the invention, there are two cycloid or control components and the additional part is disposed between the doubled components in the form of a ring with toothed surfaces or cycloid operating surfaces. According to a further embodiment, at least two working chambers, on opposite sides of the ring, can be connected to one another. This creates e.g. a double pump or power machine, in which a control component, with teeth on both sides, is disposed between two absolutely synchronously rotating cycloid components with a number of teeth differing by one tooth from the number of teeth on the doubled components. This control component may comprise a drive or output device in dependence on whether it is a pump or a motor. Alternatively, the drive and/or output may be effected via the doubled cycloid components. The casing may serve as a stator supporting both driven cycloid components at corresponding working angles between which the control component, having sides with a number of teeth differing by one tooth, freely rotates.
According to a further advantageous embodiment of the invention, the casing or the control component has appropriate channels for the input or output of the working media, which may be optionally controlled during rotation. This precludes additional valves and also effects rinsing in the centrifugal direction.
According to a further preferred embodiment of the invention, the radial circumference of the components is spherical, and the components are guided on a corresponding spherical inner surface of the casing in a radially sealing manner. This spherical guidance permits change in the working position without creating additional sealing problems. This outer or inner radially sealing, spherical working chamber wall may be connected to the control or cycloid components and may rotate therewith to center the components with respect to each other.
In a further advantageous embodiment of the invention, the rotary piston machine is a compressor with control independent of the rotational speed effected, in particular, by changing the phase shift of the two rotating parts relative to the channels of the working media. In addition to the advantageously stable cent
Vincent Paul
Vrablik John J.
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