# US 7,607,451 B2 · Device and method for the production of a powder-air mixture

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- Number: US 7,607,451 B2
- Document ID: US7607451B2
- Status: Granted
- Kind: B2
- Application number: 10/573,187
- Filed: 2005-08-22
- Published: 2007-05-10
- Granted: 2009-10-27
- Earliest claimed: 2004-09-02
- Assignees: Weitmann & Konrad GmbH & Co. KG
- Inventors: Rainer Haas
- Web page: https://patentgrep.com/patent/US7607451B2

## CPC

- B05B 7/1404: {Arrangements for supplying particulate material}
- B01F 23/30: Mixing gases with solids
- B01F 25/312: with Venturi elements; Details thereof
- B01F 25/31242: {the main flow being injected in the central area of the venturi, creating an aspiration in the circumferential part of the conduit (B01F25/31243 takes precedence)}
- B41F 23/06: Powdering devices, e.g. for preventing set-off
- B01F 35/715: {Feeding the components in several steps, e.g. successive steps}
- Y10T 137/4891: With holder for solid, flaky or pulverized material to be dissolved or entrained
- B05B: SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES (spray-mixers with nozzles B01F25/72; processes for applying liquids or other fluent materials to surfaces by spraying B05D)
- B01F: MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING (mixing paints B44D3/06)
- B41F: PRINTING MACHINES OR PRESSES (manifolding devices or office printing machines B41L)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The invention relates to a device for generating a homogeneous powder-air mixture comprising a pressure section and a suction section, wherein the two sections merge in an outlet, wherein the pressure section terminates in an orthogonal direction in the suction section in an ejector-like manner, the suction section being open towards the surroundings. The invention also relates to a method for generating a homogeneous powder-air mixture.

## Claims

### Claim 1

A device for generating a homogeneous powder-air mixture, the device comprising:
an intake region for powder, said intake region surrounded by pressurized air forming an enveloping jet;
a pressure section adjacent to and downstream of said intake region, said pressure section extending in an axial direction;
a suction section, extending in a radial direction and having openings communicating with surroundings of the device, wherein said pressure section feeds into said suction section in an orthogonal direction, with said suction section completely surrounding said pressure section; and
an outlet region disposed immediately downstream of said suction section.

### Claim 2 (depends on 1)

The device of claim 1, wherein said intake region carries an inhomogeneous powder-air pre-mixture which terminates in said pressure section.

### Claim 3 (depends on 1)

The device of claim 1, wherein said suction section carries ambient air.

### Claim 4 (depends on 1)

The device of claim 1, wherein said pressure section is jacketed by said suction section.

### Claim 5 (depends on 1)

The device of claim 1, wherein said suction section has several suction passages or openings that feed to surroundings.

### Claim 6 (depends on 5)

The device of claim 5, wherein said suction passages or openings are uniformly distributed about a periphery of said suction section.

### Claim 7 (depends on 5)

The device of claim 5, wherein said suction passages or openings are disposed in a radial direction.

### Claim 8 (depends on 5)

The device of claim 5, wherein said suction passages or openings are at an angle with respect to a radial direction.

### Claim 9 (depends on 1)

The device of claim 1, wherein an outlet has a cylindrical design.

### Claim 10 (depends on 1)

The device of claim 1, wherein said suction section conically tapers in a flow direction.

### Claim 11 (depends on 1)

The device of claim 1, further comprising an upstream mixer generating a powder-compressed air mixture and having an outlet terminating in said suction section.