# US 11,898,549 B2 · Dosing pump with dosing diaphragm

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- Number: US 11,898,549 B2
- Document ID: US11898549B2
- Status: Granted
- Kind: B2
- Application number: 17/120,686
- Filed: 2020-12-14
- Published: 2021-06-24
- Granted: 2024-02-13
- Earliest claimed: 2019-12-19
- Assignees: ProMinent GmbH
- Applicants: ProMinent GmbH
- Inventors: Marc Mohr; Roland Elgetz; Martin Reinhard
- Web page: https://patentgrep.com/patent/US11898549B2

## CPC

- F04B 43/06: Pumps having fluid drive
- F04B 13/00: Pumps specially modified to deliver fixed or variable measured quantities
- F04B 43/0054: {particularities of the flexible members}
- F04B 43/02: having plate-like flexible members, e.g. diaphragms (F04B43/14 takes precedence)
- F04B 43/043: {Micropumps}
- F04B 43/067: the fluid being actuated directly by a piston
- F04B 43/073: the actuating fluid being controlled by at least one valve
- F04B 43/107: the fluid being actuated directly by a piston
- F04B 43/14: having plate-like flexible members
- F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F)

## Abstract

The present invention concerns a dosing pump comprising a dosing chamber, a working chamber and a dosing diaphragm, wherein the dosing chamber and the working chamber are separated from each other by the dosing diaphragm, wherein there is provided a device for reciprocating movement of the dosing diaphragm between a first position and a second position, wherein the volume of the dosing chamber is smaller in the first position than in the second position. To provide a dosing pump, the dosing diaphragm of which has an increased service life and which as far as possible can be hydraulically operated even at very low dosing fluid pressures at the suction side it is proposed according to the invention that there is provided a prestressing device which prestresses the dosing diaphragm in the direction of the first or second position.

## Claims

### Claim 1

A dosing pump comprising a dosing chamber, a working chamber, a dosing diaphragm comprising an elastic material having edge regions, and a gripping device having two mutually corresponding contact surfaces, the gripping device holding the dosing diaphragm at the edge regions,
wherein the dosing chamber and the working chamber are separated from each other by the dosing diaphragm,
wherein there is provided a device for reciprocating movement of the dosing diaphragm between a first position and a second position,
wherein the volume of the dosing chamber is smaller in the first position than in the second position,
wherein there is provided a prestressing device which prestresses the dosing diaphragm in the direction of the first or second position,
wherein the prestressing device is configured so that when the dosing diaphragm is in the first position or the second position it is prestressed in the same direction, such that the dosing diaphragm no longer involves a relieved state, but moves only between two positions which are both prestressed in the same direction and the dosing diaphragm is elastically deformed in the same direction even when there is no pressure difference between the working chamber and the dosing chamber, characterized in that the gripping device is of such a configuration that the gripping device functions as the prestressing device, and
wherein the dosing diaphragm is metal, wherein due to the prestressing of the dosing diaphragm the dosing diaphragm is moved in the direction of the first position until the return force of the elastic material compensates for the prestressing force.

### Claim 2 (depends on 1)

A dosing pump according to claim 1 characterized in that the gripping device prestresses the dosing diaphragm in the direction of the first position.

### Claim 3 (depends on 1)

A dosing pump according to claim 1 characterized in that the device for reciprocating movement of the dosing diaphragm is a hydraulic device and a hydraulic fluid is arranged in the working chamber, wherein the hydraulic device is of such a design configuration that it can act on the hydraulic fluid with a hydraulic pressure to move the dosing diaphragm in the direction of the first position.

### Claim 4 (depends on 1)

A dosing pump according to claim 1 characterized in that the dosing diaphragm is a flat metal foil.

### Claim 5 (depends on 2)

A dosing pump according to claim 2 characterized in that the corresponding contact surfaces are of a non-flat configuration.

### Claim 6 (depends on 2)

A dosing pump according to claim 2 characterized in that the corresponding contact surfaces are of a curved configuration.

### Claim 7 (depends on 2)

A dosing pump according to claim 2 characterized in that the corresponding contact surfaces are of a conical configuration having a cone angle.

### Claim 8 (depends on 7)

A dosing pump according to claim 7 wherein the cone angle of the corresponding contact surfaces is between 0 degrees and 10 degrees.

### Claim 9 (depends on 8)

A dosing pump according to claim 8 wherein the cone angle is between 2 degrees and 5 degrees.