RU2247174C2 - Apparatus for gasodynamic deposition of powder materials - Google Patents

Abstract

FIELD: portable apparatuses for applying coatings of powder materials by gasodynamic deposition.

SUBSTANCE: apparatus includes compressed gas source, powder meter, deposition unit in the form of portable manual tool with remote control having supersonic nozzle and gas heater rigidly connected with it. Gas heater includes metallic body inside which electric and heat insulation having through mutually parallel pneumatic ducts with inserted in them heating members. Apparatus also includes pneumatic duct for feeding powder from powder meter to supersonic nozzle, locking devices and unit for controlling deposition process, said units are mutually connected through flexible pneumatic ducts and electric connection wires. According to invention electric and heat insulation of gas heater includes inner and outer cylinders coaxially arranged one inside other. Inner cylinder has central through passage for placing pneumatic duct for feeding powder from meter to supersonic nozzle. Pneumatic ducts along its periphery are in the form of grooves. Inner and outer cylinders of electric heat insulation of gas heater are made of heat resistant material having electric and heat insulated coating on surfaces restricting pneumatic ducts.

EFFECT: enlarged manufacturing possibilities, simplified design, lowered mass, improved capability for repairing works, enhanced operational efficiency.

2 cl, 3 dwg

Description

The invention relates to devices for applying coatings of powder materials by gas-dynamic spraying of a portable type and can find application in mechanical engineering, energy, metallurgy and other areas of production for producing single and multilayer coatings for various functional purposes.

A device for gas-dynamic spraying, containing a source of compressed gas, a powder dispenser, a supersonic nozzle assembly, a working gas heater, as well as a speed control system for powder particles, including locking and regulating organs. [1].

The disadvantage of this design is the limited technological and functional capabilities, namely, that the heating element is made in the form of a long electrically conductive tube, the inside of which is a pneumatic channel of the working gas, which causes an increase in the dimensions and weight of the heater as a whole and complicates its use as a portable tool.

A device for gas-dynamic spraying of powder materials of a portable type is also known [2]. This device is made in the form of a spraying unit and a control unit interconnected by flexible pneumatic electric wires. The spraying unit is made in the form of a portable hand tool with remote control and consists of a supersonic nozzle and a gas heater rigidly connected to it.

The disadvantage of this design is that the axis of the supersonic nozzle is not aligned with the gas heater, and the powder is supplied from the dispenser to the supersonic nozzle by means of a flexible pneumatic line; the electric heat insulator of the gas heater is made with through pneumatic channels, inaccessible for placement of heating elements in them. The manufacture of an electrothermal insulator with through parallel pneumatic channels has technological difficulties, and the misalignment of a supersonic nozzle with a gas heater reduces the efficiency of the installation.

The objective of the technical solution is to expand technological capabilities, simplify the design and reduce its weight, increase maintainability, as well as increase the efficiency of the device for gas-dynamic spraying of powder materials of a portable type.

The task is achieved due to the fact that the device for gas-dynamic spraying of powder materials containing a source of compressed gas, a powder dispenser, a spraying unit made in the form of a portable hand tool with remote control and consisting of a supersonic nozzle and a gas heater rigidly connected with it, made in the form of a metal enclosures with an electric heat insulator located inside with through parallel pneumatic channels and heating elements built into them, as well as pneumatic powder supply water from the dispenser to the supersonic nozzle, shutoff valves and the control and spraying control unit, interconnected by flexible pneumatic electroconductors. The gas heater is installed coaxially with the supersonic nozzle, while the electric heat insulator of the gas heater is made of internal and external coaxially mounted cylinders, and the central through channel is made in the inner cylinder for passing the pneumatic powder supply line from the batcher to the supersonic nozzle, and the pneumatic channels are made along its periphery in in the form of grooves, while the inner and outer cylinders of the electrothermal insulator of the gas heater are made of heat-resistant material with electrothermal insulation coating on the surfaces bounding pnevmokanaly.

The electrothermal insulation coating on the surfaces restricting the pneumatic channels is made by microarc oxidation.

The central through channel for the passage of the pneumatic pipeline from the powder dispenser to the supersonic nozzle, made in the inner cylinder of the electrothermal insulator, allows you to install the supersonic nozzle coaxially with the gas heater, which ensures the combination of the flow directions of the heated gas and the gas-powder mixture, which improves the technical characteristics of the installation and increases its efficiency .

The proposed design of a gas heater electric heat insulator increases the manufacturability of its manufacture and assembly, and also creates the possibility of manufacturing it from heat-resistant materials with an electrothermal insulation coating on the surfaces that limit the pneumatic channels. For example, from non-ferrous metal alloys (aluminum or titanium) with surface treatment, limiting pneumatic channels, microarc oxidation. In this case, the inner and outer cylinders of the electrothermal insulator can be made in various combinations of these materials.

These features are not identified in other technical solutions when studying the level of this technical field, and, therefore, the solution is new and has an inventive step.

1 shows a spraying unit with a gas heater of a gas-dynamic spraying device for powder materials.

Figure 2 shows a gas heater, where the inner cylinder is made of metal with electrothermal insulation coating, or of an alloy of non-ferrous metals with surface treatment, limiting the pneumatic channels, microarc oxidation, and the outer cylinder of ceramic.

Figure 3 shows a gas heater, where the inner cylinder is made of metal with electrothermal insulation coating, and the outer cylinder is made of a non-ferrous metal alloy with microarc oxidation treatment.

The device for gas-dynamic spraying of powder materials is made of blocks interconnected by flexible pneumatic electric wires: the spraying unit shown in Fig. 1, a powder dispenser and a control and monitoring unit.

The spraying unit is made in the form of a portable hand tool with remote control. It consists of a gas heater 1, including a metal casing 2, an electrothermal insulator 3, pneumatic channels 4, heating elements 5, a pipe for supplying working gas 6, a temperature sensor 7, a button 8 for remote control of the powder dispenser and a supersonic nozzle 9 rigidly connected to the gas heater 1.

The electric heat insulator 3 of the gas heater is made of two cylinders: the inner 10 with pneumatic channels in the form of grooves 11 on the outer surface and the central through channel 12 and the outer cylinder 13. Heating elements 5 are laid in the grooves of the inner cylinder, and the pneumatic pipe 14 passes from the powder dispenser through the central through channel to supersonic nozzle 9.

The collapsible design of an electrothermal insulator made of two cylinders simplifies the laying of heating elements in pneumatic channels and makes it possible to use new promising technological processes for producing electrothermal insulation coatings, for example, plasma spraying, microarc oxidation, etc. In addition, the design of an electrothermal insulator allows it to be made in a different combination of materials in depending on technological capabilities and the required modes of heating the working gas.

Device gas-dynamic spraying of powder materials works as follows.

The device is connected to a compressed gas system and power supply. At the control and monitoring unit, the necessary parameters of temperature and pressure of the working gas are set and set. Compressed gas is supplied to the dispenser and the spraying unit. The working gas, passing through the pneumatic channels 4 of the heater, enters the supersonic nozzle 9. To the supersonic nozzle through the Central through channel 12 receives from the dispenser a gas-powder mixture. The gas-powder mixture together with the heated gas in the nozzle is accelerated to supersonic speed and transferred to the workpiece.

The proposed constructive solution of the spraying unit provides the expansion of technological capabilities, simplification of its design and weight reduction, and also increases the maintainability of the device for gas-dynamic spraying of powder materials of a portable type and increases its efficiency.

Sources of information

1. RF patent No. 1674585, MKI S 23 S 26/00, 1989.

2. RF patent No. 2190695, MKI S 23 S 26/00, 04/20/2000 - prototype.

Claims (2)

1. A device for gas-dynamic spraying of powder materials, containing a source of compressed gas, a powder dispenser, a spraying unit made in the form of a portable hand tool with remote control and consisting of a supersonic nozzle and a gas heater rigidly connected to it, made in the form of a metal case with an electric heat insulator placed inside with through parallel pneumatic channels and heating elements built into them, as well as a pneumatic powder supply line from the dispenser to the supersonic lu, shutoff valves and control unit and spraying control, interconnected by flexible pneumatic electric wires, characterized in that the gas heater is installed coaxially with the supersonic nozzle, while the electric heat insulator of the gas heater is made of internal and external coaxially mounted one another cylinder, moreover, in the inner cylinder is made the central through channel for the passage of the pneumatic pipeline of the powder supply from the dispenser to the supersonic nozzle, and the pneumatic channels are made along its periphery in the form of grooves, at Ohm, the inner and outer cylinders of the gas heater’s thermo-insulator are made of a heat-resistant material with electrothermal insulation coating on the surfaces that limit the pneumatic channels. 2. The device according to claim 1, characterized in that the electrothermal insulation coating on the surfaces restricting the pneumatic channels is made by microarc oxidation.

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