CN210122586U - Supersonic flame spraying gun with double-path powder feeding structure - Google Patents

Abstract

A supersonic flame spraying gun with a two-way powder feeding structure comprises a barrel arranged horizontally and a gun seat arranged vertically, wherein the gun seat is positioned behind the barrel; the oxygen inlet and the fuel inlet are communicated with the combustion chamber, and the conical nozzle is arranged above the combustion chamber; a first powder feeding port is arranged at the rear part of the gun seat and is horizontally arranged and communicated with the conical nozzle; a bore is arranged in the center of the gun barrel and is communicated with the conical nozzle, and a second powder feeding port which is vertically arranged and is communicated with the bore is arranged in the middle of the gun barrel; the particle size of the powder conveyed by the first powder feeding port is larger than that of the powder conveyed by the second powder feeding port. According to the utility model discloses a supersonic speed flame spraying rifle makes different particle diameter powders can both reach fully to soften to form mutual adhesion at the spraying in-process, thereby show the deposition efficiency who improves the particle.

Description

A supersonic flame spray gun with dual-channel powder feeding structure

technical field

The utility model generally relates to thermal spray coating equipment, in particular to a supersonic flame spray gun.

Background technique

Supersonic flame spraying (High-velocityoxygen-fuel, referred to as HVOF). It is a high-temperature and high-speed combustion flame produced by the use of propane, propylene and other hydrocarbon gas or aviation kerosene, alcohol and other liquid fuels and high-pressure oxygen in the combustion chamber, or in a special nozzle, and the combustion flame speed can reach Mach 5 ( 1500m/s) and above, the temperature can reach 3200℃. By feeding the powder axially into the flame, the sprayed particles can be heated to a molten or semi-melted state, and accelerated to a speed of up to 300-500m/s or even higher, hitting the surface of the substrate to obtain high bonding strength and dense high quality coating.

The problems existing in the existing supersonic flame spraying equipment are: due to the uneven melting state of the sprayed particles, the particle deposition efficiency is low, usually below 40%.

Utility model content

The purpose of the utility model is to provide a supersonic flame spray gun with a dual-path powder feeding structure, which can improve the powder deposition efficiency.

According to the utility model, the supersonic flame spraying gun with dual-path powder feeding structure comprises a horizontally arranged gun barrel and a vertically arranged gun seat, and the gun seat is located behind the gun barrel.

The lower part of the gun seat is provided with an oxygen inlet and a fuel inlet, the middle part of the gun seat is provided with a combustion chamber, the oxygen inlet and the fuel inlet are communicated with the combustion chamber, and a conical nozzle is arranged above the combustion chamber; the rear of the gun seat is provided with a first powder feeding The first powder feeding port is arranged horizontally and communicated with the conical nozzle; the center of the gun barrel is provided with a gun chamber, and the gun chamber is communicated with the conical nozzle; Powder mouth.

Wherein, the particle size of the powder conveyed by the first powder feeding port is larger than the particle size of the powder conveyed by the second powder feeding port.

Preferably, the length of the barrel is 20-30cm, and the second powder feeding port is 10-15cm away from the muzzle of the barrel.

Preferably, a communicating cooling water channel is provided in the gun barrel and the gun seat.

Preferably, the barrel and the gun seat are made of red copper as a whole, and the conical nozzle is made of ceramic material.

According to the supersonic flame spray gun of the utility model, by setting two powder feeding ports, the larger particle size powder and the smaller particle size powder are separately conveyed, so that the powder with different particle sizes can be fully softened, and during the spraying process Mutual adhesions are formed, which can significantly improve the deposition efficiency of the particles.

Description of drawings

1 is a schematic diagram of the structure and working principle of a supersonic flame spray gun according to the present invention.

Detailed ways

The present utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood by those skilled in the art that the embodiments described below are only exemplary illustrations of the present invention, and are not intended to be used for any limitation.

Referring to FIG. 1 , the supersonic flame spray gun according to the present invention mainly includes a horizontally arranged gun barrel 1 and a vertically arranged gun seat 2 , and the gun seat 2 is located behind the gun barrel 1 .

Wherein, the lower part of the gun seat 2 is provided with an oxygen inlet 21 and a fuel inlet 22, the middle part of the gun seat 2 is provided with a combustion chamber 23, the oxygen inlet 21 and the fuel inlet 22 are communicated with the combustion chamber 23, and a conical nozzle 24 is arranged above the combustion chamber 23; The rear of the gun base 2 is provided with a first powder feeding port 11, which is arranged horizontally and communicated with the conical nozzle 24; the center of the gun barrel 1 is provided with a gun chamber 10, and the gun chamber 10 is communicated with the conical nozzle 24, In the middle of the gun barrel 1 is provided a second powder feeding port 12 which is vertically arranged and communicated with the gun chamber 10 .

The barrel 1 and the gun seat 2 are made of red copper as a whole, so that the heat dissipation is fast. The conical nozzle 24 is made of ceramic material, such as tungsten carbide ceramic, which can withstand high temperature. In addition, the gun barrel 1 and the gun base 2 are provided with a cooling water channel communicating with each other.

Preferably, the overall length of the barrel 1 is 20-30 cm, and the second powder feeding port 12 is 10-15 cm away from the barrel muzzle (the powder outlet at the right end).

When the supersonic flame spray gun of the present invention is spraying the coating, oxygen and fuel (hydrocarbon-based gas such as propane and propylene or liquid fuel such as aviation kerosene and alcohol) enter the combustion chamber 23 from the oxygen inlet 21 and the fuel inlet 22 respectively. The combustion is carried out, and the generated high-temperature flame flows through the conical nozzle 24 and is accelerated into the gun chamber 10, carrying the larger particle size powder fed from the first powder feeding port 11 and the smaller particle size fed from the second powder feeding port 12. The powder is ejected from the muzzle to the surface of the substrate 40 to form a coating.

The particle size of the powder conveyed by the first powder feeding port 11 may be greater than 80 μm, for example, 80-150 μm, and the particle size of the powder conveyed by the second powder feeding port 12 may be less than 80 μm, preferably 30-50 μm. The large particle size powder conveyed by the first powder feeding port 11 and the small particle size powder conveyed by the second powder feeding port 12 are mixed and adhered to each other in the high-temperature and high-speed flame flow, thereby reducing the detachment on the surface of the substrate 40 and significantly improving the deposition efficiency. , After testing, in the sprayed Co-WC coating, the deposition efficiency reached more than 50%.

The above are only preferred embodiments of the present invention, and all equivalent changes or modifications made according to the claims of the present invention shall fall within the scope of the claims of the present invention.

Claims (4)

1. A supersonic flame spraying gun with a two-way powder feeding structure is characterized by comprising a gun barrel and a gun seat, wherein the gun barrel is horizontally arranged, the gun seat is vertically arranged, and the gun seat is positioned behind the gun barrel;

the oxygen inlet and the fuel inlet are communicated with the combustion chamber, and the conical nozzle is arranged above the combustion chamber; a first powder feeding port is arranged at the rear part of the gun seat and is horizontally arranged and communicated with the conical nozzle; a bore is arranged in the center of the gun barrel and is communicated with the conical nozzle, and a second powder feeding port which is vertically arranged and is communicated with the bore is arranged in the middle of the gun barrel;

the particle size of the powder conveyed by the first powder feeding port is larger than that of the powder conveyed by the second powder feeding port.

2. A supersonic flame spray gun according to claim 1, wherein the length of the barrel is 20-30cm and the second powder feed port is 10-15cm from the muzzle of the barrel.

3. A supersonic flame spray gun according to claim 1, wherein the barrel and the butt are provided with communicating cooling water passages therein.

4. The supersonic flame spray gun of claim 1, wherein the barrel and the base are integrally formed of red copper, and wherein the conical nozzle is formed of ceramic.

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