SU1699633A1 - Apparatus for electrostatically applying powder materials to inner pipe surfaces - Google Patents

Abstract

This invention relates to devices for electrostatically applying powdered materials to the inner surface of pipes. The aim of the invention is to increase the productivity and the deposition rate of the powdered material. The goal is achieved by the fact that the suction pipeline is designed as a confuser, placed inside the pipeline and concentric to it. The nozzles of the pipeline are located on the generator body. The corona electrode is made in the form of electrically connected needles installed in the material conduit opposite the spray nozzles. 2 Il.

Description

The invention relates to devices for the electrostatic application of powdered materials and can advantageously be used when applying powdered materials to the inner surface of cylindrical articles such as pipes.

The aim of the invention is to increase the productivity and the deposition rate of the powdered material.

FIG. 1 shows the device, a general view; in fig. 2 is a section A-A in FIG. one.

The device contains a metal housing 1 with nozzles 2 and 3 of the input powder mixture. The body 1 contains a material line 4 with spray nozzles 5, - located on the generator of the body, and a diaphragm 6 at the end. The corona electrode is made in the form of electrically connected needles 7 installed in the material conduit 4 opposite the nozzles 5. Inside the material conduit 4

installed pipeline 8 suction, made in the form of confuser. Inside the shell of the pipeline 8, there is a conductor 9 connecting the electrodes 7 to the high-voltage source 10. A piping system 11 and 12 is provided in the installation, informing the outlet of the pipeline 8 with the nozzle 3 of the gas-powder mixture through the ejector 13. The device is placed inside the coated pipe 14.

The device works as follows.

The powder-air mixture is fed into the housing 1 through the pipe 2 from the powder material feeder (not shown), passes through an annular narrowing gap between the material pipe 4 and the suction pipe 8 and sprays through the nozzles 5 onto the inner surface of the pipe 14. At the same time from the source 10 through high voltage the cable and conductor 9 is supplied with high voltage to the needle electrodes 7.

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When powder flows through nozzles 5, material particles are charged in the zone of corona discharge of needle-electrodes 7. Changing the direction of the powder-air mixture by 90 ° when it flows out of nozzles 5 allows extinguishing the flow rate, thereby increasing the passage time of powder particles through the electrode zone and, consequently, increase the efficiency of powder charging,

When the sprayer moves along the pipe, the uncooled powdered material is sucked by the ejector 13 through the orifices of the diaphragm 6 into the suction pipe 8, is transported through it with increasing speed and then goes through the pipe 11 to the ejector 13, by which this material is fed through the pipe 12 through the pipe 3 to the material 4.

Thus, powdery material is sprayed at relatively low speeds under conditions of intense charging of powder particles, coinciding with the direction of the power lines of the electrostatic field with the direction of air flow. At high

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working performance, the active sputtering zone is expanded, the powder deposition coefficient, and the quality of the coating increase.

A device for electrostatic powder coating of materials on the inner surface of pipes, comprising a housing with a material pipeline placed in it with spray nozzles and a discharge electrode, a suction pipe, a pipeline system that communicates the outlet of the suction pipe with a material input pipeline, characterized in that productivity and deposition rate of powdered material, the suction pipeline is made in the form of confuser, placed inside the material The gangway is concentric to it, the nozzles of the material pipeline are located on the generator of the body, while the discharge electrode is made in the form of electrically connected needles installed in the material pipeline opposite the spray nozzles.

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Claims (1)

Claim Device for electrostatic on; carrying powdered materials to the inner surface of the pipes, including a housing with a material pipe with spray nozzles and a corona electrode placed therein, a suction pipe, a system of pipes communicating the output of the suction pipe from the input of the material pipe, characterized in that, in order to increase the productivity and deposition coefficient of the powder material, the suction pipe is made in the form of a confuser, placed inside the material pipe concentrically to it, the material pipe nozzle is located ^ on the stripping case, while the corona electrode is made in the form of electrically connected needles, set