Pumps – Expansible chamber type – Valved piston
Patent
1995-07-17
1996-12-31
Gluck, Richard E.
Pumps
Expansible chamber type
Valved piston
417552, 137541, 13754317, F04B 2104
Patent
active
055888178
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention derives from a pressure-medium-traversed piston of a reciprocating piston pump as set forth hereinafter. In piston pumps of this type, it is endeavored to make the dead space as small as possible. From French Patent Specification 1 218 349, a pump is therefore known in which the inlet valve is embedded in the piston of a one-part configuration and terminates, with the valve disk of its closing member, flush with the piston face. The stem of the closing member, which stem emanates from the valve disk, is guided snugly in a longitudinal bore of the piston. The longitudinal bore, which is configured as a pocket bore, is widened in diameter in the direction of the bore bottom and there receives a closing spring of the inlet valve. This is configured as a cylindrical helical compression spring and acts, on the one hand, upon a shoulder of the stepped longitudinal bore and, on the other hand, upon a head-like thickening at the stem end of the closing member. The depiction of this state of development in the said publication involves a schematic representation, for the thickened stem of the closing member and the longitudinal bore of the piston, which longitudinal bore is matched to the stem, and does not allow the closing member and closing spring to be fitted, in a one-part piston, from the piston face.
ADVANTAGES OF THE INVENTION
The piston according to the invention, has the advantage in relation to the above of introducing the closing spring with the stem of the closing member relatively simply into the longitudinal bore and, by virtue of a rotary motion acting upon the valve disk, of being able to sink it like a screw into the longitudinal bore, until contact is made behind the shoulder of the latter. As the installation position is reached, the bias of the closing spring is simultaneously able to be generated. A multi-part configuration of the piston is therefore dispensable.
The measures quoted herein enable advantageous refinements and improvements to be made to the piston specified herein.
The measure specified herein are is advantageous because, purely by virtue of a particular shaping of the shoulder, it enables the spring to be sunk without additional accessories.
With the difference in designs, of the piston according to the invention, the functioning of the shoulder in the longitudinal bore, both for the supporting of the spring and for the screw-like sinkage of the spring into the bore, is obtained with the use of simple component parts. The respective projection herein engages between spring windings and, upon rotation of the closing member about its longitudinal axis, produces the sinkage motion of the closing spring into the longitudinal bore.
That refinement of the invention which is specified herein serves the fastening of the closing spring to the stem of the closing member in the course of assembly and the axial support of the biased closing spring against the stem segment which limits the constriction in the direction facing away from the valve disk.
With the design which is characterized herein, a positive connection between the closing spring and the stem of the closing member is created in a simple manner so as to transmit the torque which is necessary for the screw-like sinkage of the closing spring into the longitudinal bore.
The measure specified herein renders a guide for the closing member on its stem superfluous and transposes said guide into the cylinder bore without blocking the pressure-medium flow. The valve disk, which is configured, for example, in the shape of a spherical disk, is therefore capable of aligning itself relative to its frustoconically shaped valve seat and enables the closing force to be transmitted, virtually free from transverse forces, to the valve seat.
BRIEF DESCRIPTION OF THE DRAWINGS
Illustrative embodiments of the invention are shown in simplified representation in the drawing and explained in greater detail in the following description.
FIG. 1 shows a longitudinal section of a pump element of a reciprocating piston pump
REFERENCES:
patent: 578499 (1897-03-01), Pierson
patent: 1293936 (1919-02-01), Rose
patent: 2784737 (1957-03-01), Kelly
patent: 5123819 (1992-06-01), Schuller et al.
Schuller Wolfgang
Urban Martin
Zirps Wilhelm
Gluck Richard E.
Greigg Edwin E.
Greigg Ronald E.
Robert & Bosch GmbH
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