RU2444409C2 - Powder feeder - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: proposed invention relates, primarily, to powder spraying appliances and may be used for uniform transfer of powder materials. Proposed feeder comprises injector and mixing chamber arranged aligned in tube with powder intake holes. Said tube is arranged inside container, at its bottom. Diffuser is arranged inside mixing chamber. Injector nozzle diameter makes 0.1 to 0.5 diameter of mixing chamber.

EFFECT: higher efficiency, uniform transfer.

3 cl, 1 dwg

Description

This invention relates to apparatus for applying thermal spray coatings of powder materials, in particular to pneumatic powder feeders, used mainly in conjunction with a spray burner.

Known powder feeder containing a reservoir, a tubular intake with a conical socket at the inlet, at the outlet of which an injector and a mixing chamber are installed [1].

A disadvantage of the known feeder is the low productivity of transporting metal powders.

The purpose of the invention is to increase the productivity of transportation of powder materials.

This goal is achieved by the fact that in the powder feeder containing the tank, intake, injector, mixing chamber and diffuser, the injector and the mixing chamber are coaxially placed in a tube having holes for collecting powder, which is installed inside the tank in its lower part, while mixing the diffuser is coaxially mounted to the chamber, and the diameter of the injector nozzle is 0.1-0.5 of the diameter of the mixing chamber.

The holes for collecting powder can be made in the form of grooves, and a tube with an injector and a mixing chamber can be installed with an angle of deviation from the plane of the bottom to 45 °.

The drawing shows a powder feeder, General view.

The powder feeder consists of a reservoir 1, a tube 2 with holes 3 for collecting powder, an injector 4 with a nozzle 5, a mixing chamber 6 located coaxially in the tube 2, and a diffuser 7 mounted coaxially with the mixing chamber 6.

Powder feeder operates as follows.

Oxygen or compressed air is supplied to the injector 4. As a result, a vacuum is created in the tank 1 and powder enters the openings 3, which, under the dynamic pressure of the gas flowing from the nozzle 5 of the injector 4, is transported to the mixing chamber 6 and then through a diffuser 7 it enters a flexible pipe (not shown), and from it uniform the jet enters the powder channel of the spray burner.

The performance of the powder supply to the burner is set by the pressure of oxygen (compressed air) entering the injector 4, as well as by the ratio of the diameter of the nozzle 5 of the injector 4 and the diameter of the mixing chamber 6.

The proposed feeder is able to evenly transport powders and with low rheological properties.

Information sources

1. USSR author's certificate No. 1003926 from 01.24.1979 (prototype)

Claims (3)

1. A powder feeder, used mainly in installations for applying thermal coatings, containing a reservoir, intake, injector, mixing chamber and diffuser, characterized in that, in order to increase the productivity of transporting the powder material, the injector and mixing chamber are coaxially placed in the tube having openings for collecting powder, which is installed inside the tank in its lower part, while a diffuser is attached to the mixing chamber, and the diameter of the injector nozzle is 0.1-0.5 of the diameter of the mixture camera. 2. The powder feeder according to claim 1, characterized in that the holes for collecting the powder are made in the form of grooves. 3. The powder feeder according to claim 1 or 2, characterized in that the tube with the injector and the mixing chamber are installed with an angle of deviation from the plane of the bottom to 45 °.

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