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US 8,132,740 B2Granted
Gas dynamic spray gun
AssigneeTessonics Corporation
InventorsRoman Gr. Maev, Volf Leshchynsky, Emil E. Strumban
Life of this patent
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Abstract
A portable gas dynamic cold spray gun eliminates many of the inherent limitations of the prior art by minimizing a scatter of operating parameters and improving its efficiency. According to one feature of the present invention, the powder flow rate is continuously measured so that the powder flow rate and/or the flow rate of the pressurized gas can be adjusted accordingly in order to control the deposition efficiency of the spray gun.
Claims26
A method for controlling a cold spray gun including the steps of:
- a) flowing powder into a stream of conveyance air;
- b) measuring a powder flow rate of the powder;
- c) adjusting at least one of a flow rate of the conveyance air and the powder flow rate based upon the measured powder flow rate of the powder;
- and
- d) forming a supersonic jet of the conveyance air and the powder, the supersonic jet having a temperature below a fusing temperature of the powder, said step d) including the step of directing the conveyance air through a nozzle of the gun, wherein the conveyance air travels along a straight path from the nozzle to an exit of the gun;
- wherein said step a) includes introducing the powder into the stream of conveyance air downstream of the nozzle.
3 more elements
A cold spray gun comprising:
- a gas supply port;
- a passageway leading from the gas supply port, the passageway including a nozzle having a converging portion and a tube leading to ambient;
- a bowl receiving powder from a powder container;
- a powder container vibration unit vibrating the powder container;
- a bowl vibration unit vibrating the bowl;
- a powder feed passage between the bowl and the tube, the powder feed passage leading into the tube;
- a powder flow rate sensor measuring a powder flow rate of powder, wherein the powder flow rate sensor is positioned to measure the powder flow rate of powder prior to the passageway;
- and
- a controller for controlling the powder container vibration unit and the bowl vibration unit based upon information from the powder flow rate sensor.
6 more elements
A cold spray gun comprising:
- a nozzle having a converging portion and a diverging portion;
- a gas heater connected to the nozzle;
- a pressurized gas source for injecting a gas into the nozzle through the gas heater;
- a powder feeder for feeding a powder into the diverging portion of the nozzle, the powder feeder including at least one vibrator;
- a dispensing nose and an axially opposite funnel having a partial-vacuum zone therebetween between for the purpose of aspirating powder out of a powder source;
- a sensor and a light source measuring powder feed rate from the funnel;
- and
- a controller regulating a flow of the gas into the nozzle based upon the measured powder feed rate, the controller regulating the at least one vibrator to control the powder feed rate.
5 more elements
Dependencies are inferred from the claim text.