Diaphragm piston pump

Details Diaphragm piston pump Diaphragm piston pump

1999-07-22

2001-01-16

Walberg, Teresa (Department: 3742)

Pumps

Motor driven

Fluid motor

C417S339000, C417S395000

Reexamination Certificate

active

06174144

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a diaphragm piston pump with n (at least two) pump chambers each defined by a diaphragm, for mounting on a drive mechanism with n pistons, wherein the pump head with the diaphragms, the pump chambers and with covers is placed on the drive mechanism.
2. Description of the Related Art
A diaphragm piston pump of the above-described type is disclosed in DE-C2-39 03 049.
In this known diaphragm piston pump, the pump chambers, referred to as pump work chambers in the reference, are arranged on different sides of the hydraulic housing containing the cylinders for the pistons. In this diaphragm piston pump, the diaphragm is braced between the “covers” containing the pump chambers. The purpose of this configuration is to provide an inexpensive construction.
SUMMARY OF THE INVENTION
Therefore, it is the primary object of the present invention to provide a diaphragm piston pump of the above-described type which is of compact construction, makes possible a modular construction, and is inexpensive to manufacture.
In accordance with the present invention, the pump head is divided into n+1 pump head elements which are arranged next to each other in a row in such a way that the respectively second pump head element forms the cover as well as the pump chamber for the previously arranged pump head element on which it is mounted, wherein the diaphragms are braced between the pump head elements and are aligned essentially parallel to the longitudinal axis of the pistons.
Accordingly, in accordance with the present invention, the pump head, which contains the diaphragms and the pump chambers and on which are mounted the covers in the case of a conventional construction, is divided into several pump head elements. The number of pump head elements required is always one greater than the number of pistons in the drive mechanism. These pump head elements are then arranged laterally next to one another in such a way that the second pump head element forms the cover and the pump chamber for the first pump head element, etc., depending on the number of pump head elements. The first pump head element in the row of pump head elements is then only a hydraulic housing, while the subsequent pump head elements are hydraulic housings and covers with pump chambers. The last pump head element, i.e. the n+1 pump head element, then only forms a cover with pump chamber. The diaphragms are each braced between the pump head elements. The diaphragms are aligned parallel relative to the longitudinal axes of the pistons. The planes in which the diaphragms are braced and which form the connecting planes between the individual pump head elements, extend parallel to the longitudinal axes of the pistons.
The pump head elements are essentially of identical construction (only the first pump head element constitutes a hydraulic housing and the last pump head element constitutes a cover) so that pump heads of various types can be assembled in a modular manner. The construction is very compact because all pump head elements are mounted at the end face of the drive mechanism.
A very short and compact structural unit is obtained if the pistons of the diaphragm piston pump extend directly and parallel to the surface of the diaphragm into the corresponding pump head element.
However, it is also possible to arrange an intermediate separate guide housing on which the pump head elements are mounted. This makes it possible to use a drive mechanism whose cylinder spacings do not coincide with the gauges of the pump head elements.
The pump head elements can be connected to each other by various means, for example, by expanding screws. However, it is also possible to use other frictionally engaging connections, for example, means which introduce forces produced hydraulically or pneumatically.
In accordance with an advantageous feature, the pressure lines and the intake lines and the work valves can be integrated into the pump head elements. This further improves the compact construction.
However, it is also possible to integrate a homogenizing device in one of the pump head elements.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of the disclosure. For a better understanding of the invention, its operating advantages, specific objects attained by its use, reference should be had to the drawing and descriptive matter in which there are illustrated and described preferred embodiments of the invention.


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