Positive displacement machine, more particularly pump, and metho

Details Positive displacement machine, more particularly pump, and metho Positive displacement machine, more particularly pump, and metho

1986-12-01

1988-12-06

Vrablik, John J.

Rotary expansible chamber devices

Working member has planetary or planetating movement

Non-metallic working member, cylinder or partition

418 57, 418 58, 418 59, F04C 204, F04C 1100, F04C 1500

Patent

active

047893150

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention relates to positive displacement pumps, more particularly a positive displacement pump with displacement chambers, and displacement vanes, such that the displacement chambers and the displacement vanes establish a cyclical relative motion.
2. Related Art
Pumps of the general category of the present invention are known for example from German Pat. No. DT 22 30 773 to W. Gramm. However, it has been discovered that it is practically impossible to manufacture displacement chambers and displacement vanes with enough precision to ensure that, when driven with a rigid stroke, or a precise circular motion, the displacement vanes always follow closely to the walls of the displacement chambers thereby avoiding excessive strains or leaks. Further, with prior art pumps additional guide means are required to maintain the stability of the driven part in its desired position. Finally, the displacement chambers and displacement vanes of prior pumps are of such a shape that they interlock only over a section of about 270.degree. of the relative motion. It is therefore necessary to connect at least two of the displacement chambers in series with overlapping displacement regions in order to achieve a consistent displacement without leaks.


SUMMARY OF THE INVENTION

It is an object of the present invention to provide a pump as well as a process for manufacturing a pump which avoids all the afore-mentioned disadvantages. The pump is characterized in that there is provided a common, central drive for producing relative motion between displacement chambers and their respective displacement vanes; the drive being capable of transmitting from a driving shaft, through at least one radial adaptable element, a driving force with a definite radial and tangential component to a support of the displacement chamber or displacement vane. The displacement chambers and vanes are each arranged in a crown encircling the drive. The displacement chambers and the displacement vanes each comprise an outer and inner surface of tightness, both surfaces extending over at least 360.degree. and, during cyclical relative motion, being displaced relative to each other in a tight way on both sides of the displacement vane over the full cycle of motion of each displacement chamber, such that independently of the precise form and size of the displacement chambers and vanes, a sure, tight, mutual close fitting of these chambers is guaranteed while realizing the mutual, close fitting of these chambers is in a determined relative position.
The radial adaptable element which produces a driving force with a radial and a tangential component acts on the driven support in such a way that the displacement vanes and chambers are maintained in a tight relationship. Irregularities of the relative motion, that is differences of this motion from circular, are equalized by the radial adjustable element which acts like a spring or like a friction force, but not like a force transferred by a form. The direction of the driving force may be chosen such that the driven support is always firmly supported in a determined position by the opposite contacting surfaces of the displacement vanes. The chambers are arranged in an external border so that the support cannot tip.
The flexible drive which permits a slightly out of circular relative motion permits a correspondingly greater liberty in the design of the form of the displacement chambers and vanes, more particularly of their configuration, such that each chamber remains tight over 360.degree. of the relative motion. In this manner, each chamber may directly contribute to the displacement without being connected in series with another chamber. Preferably, the drive comprises a driver secured on a driving shaft. The driver acts with a driving surface inclined towards the radial direction on a socket which is mounted on a bolt of the holder to be driven. This arrangement has the advantage that in case of wear the direction of the driving force changes

REFERENCES:
patent: 1229676 (1917-06-01), Tice
patent: 2112890 (1938-04-01), Gunn
patent: 2856860 (1958-10-01), Roth
patent: 3097610 (1963-07-01), Swanson
patent: 3551079 (1970-12-01), Brundage

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