DE29603662U1 - Self-centering mixing chamber focusing nozzle to accelerate abrasive particles - Google Patents

Description

to reference number 296 03 662.5

Description:

Self-centering

Mixing chamber focusing nozzle for accelerating abrasive particles

according to the attached drawing consisting at least of:

Item 1 .1 Mixing chamber Item 1 .2 Focusing tube Item 2 Sleeve Item 3 Conical nozzle body Item 4 Pressure screw as well as Item 5 Particle feeding Item 6 IMedia feed

State of the art:

Focusing nozzles (also called abrasive nozzles) are used as tools for removal and cutting.
They are used in high-pressure water jet cutting systems, so-called abrasive cutting systems, as well as in sandblasting systems.

The function of a focusing nozzle is to focus the mixture of carrier medium and solid after mixing and acceleration in the mixing chamber to a specified outlet diameter.

to reference number 296 03 662.5
(continue to description)

The carrier medium, e.g. high-pressure water under a pressure of up to 400 MPa, or air, exits axially from a fine nozzle in the conical nozzle body and flows through the mixing chamber and focusing tube in an axial direction at high speed (up to 1000 m/sec. depending on the medium). The resulting pressure difference causes the solid particles provided via the media supply to be sucked in (injector principle).

The solid particles are accelerated towards the focusing tube by the medium flowing through the mixing chamber. In the inlet funnel of the focusing tube, the mixture of carrier medium and solid particles is focused to a desired diameter so that a high-energy jet (also called an abrasive jet) leaves the focusing tube at its lower end.

to reference number 296 03 662.5 (continue to description)

Problem:

The quality of the abrasive jet generated, especially when using water as a carrier medium, depends on the centric flow through the focusing tube, i.e. on the friction-free flow of the carrier medium through the focusing tube.

The errors that occur arise from the eccentric position of the conical nozzle body (usually contains a fine nozzle stone made of sapphire or diamond)

as well as in the case of an angular misalignment between the nozzle stone and the focusing tube.

In practice, this leads to a significantly shortened service life of all components of this tool, as well as to poorer quality results, e.g. as a cutting tool.

In order to subsequently correct the errors caused by the manufacturing of the components used, designs have been used that allow a small adjustment between the conical nozzle body and the focusing tube.

I * t

to reference number 296 03 662.5 (continue to description)

Solution:

To achieve an absolutely centric and angle-error-free position of the conical nozzle body in relation to the longitudinal axis of the focusing tube, the mixing chamber is permanently connected to the focusing tube (e.g. by gluing, shrinking or pressing in). Only now is the flat support surface and the receiving hole for the pin of the conical nozzle body created by mechanical processing. The unit thus created, consisting of the focusing tube, mixing chamber and conical nozzle body, always finds the correct position within the sleeve without any further adjustment effort, since the media supply (item 6; also called collimation tube) is the matching counterpart for the conical nozzle body and ensures the continued centric arrangement of the entire assembly.

to reference number 296 03 662.5 (continue to description)

Achieved advantages: This invention achieves that

1. an optimized beam is generated,

2. all components have a longer service life,

3. a better result is achieved when cutting or removing (de-coating),

4. the degree of utilization of this tool is increased by minimizing the adjustment effort ,

5. the overall costs for the user are reduced.

Example of implementation: An example of implementation is shown in the attached drawing

Mixing chamber focusing nozzle.

Claims (2)

Mixing chamber focusing nozzle for the acceleration of abrasive particles characterized, that mixing chamber and focusing tube unsolvable are connected to each other 2. Mixing chamber focusing nozzle according to claim 1 characterized, that the self-centering between the conical nozzle body and the focusing tube is achieved exclusively by the application of an axially acting clamping force.