CN112695267A

CN112695267A - Gas ignition type supersonic speed spray gun with inner hole

Info

Publication number: CN112695267A
Application number: CN202011573979.3A
Authority: CN
Inventors: 申忠; 侯楠楠; 倪利民; 王凯
Original assignee: Zhengzhou Lijia Thermal Spraying Machinery Co ltd
Current assignee: Zhengzhou Lijia Thermal Spraying Machinery Co ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2021-04-23

Abstract

The invention discloses a gas ignition type supersonic speed spray gun with an inner hole, which comprises a gun body, a gun barrel, a pressure stabilizer, a combustion chamber and a connector, wherein an igniter and three gas channels are arranged on the pressure stabilizer, inlets of the three gas channels are respectively communicated with an oxygen conveying pipeline, a fuel oil conveying pipeline and a fuel gas conveying pipeline, outlets of the three gas channels are respectively communicated with an inlet of the combustion chamber, a cooling water channel is arranged on the gun body and is communicated with a cooling water inlet pipe, a gap is arranged between the combustion chamber and the gun body, and the gap is respectively communicated with the cooling water channel and a cooling water outlet pipe to form cooling water circulation. The invention firstly introduces combustible gas to carry out primary ignition, and then introduces fuel oil to carry out secondary combustion after flame is introduced into the combustion chamber, thereby realizing the purpose of forming high-speed flame flow by the ignition of the spray gun and solving the problem of ignition of the external ignition type spray gun.

Description

Gas ignition type supersonic speed spray gun with inner hole

The technical field is as follows:

the invention relates to a flame spray gun for thermal spraying, in particular to a gas ignition type inner hole supersonic speed spray gun.

Background art:

supersonic flame spraying is generally used for spraying the outer surface of a workpiece, for a narrow space with the diameter within 500mm, the inner surface of the narrow space is difficult to spray by using a conventional supersonic flame spray gun, because the flame of the conventional spray gun is sprayed axially and the direction and the angle of the flame cannot be changed, only a special elbow inner hole spray gun can be used for spraying the inner wall or the inner hole, the gun barrel of the spray gun has an included angle of 60 degrees or 45 degrees with a combustion chamber, the common inner hole supersonic flame spray guns for spraying the inner wall adopt gas fuel, the pressure of the gas fuel is not high, the pressure of the combustion chamber is low when the spray gun burns, the flame speed is low, when the inner wall of a pipeline or the inner hole of some workpieces is sprayed, the sprayed particle speed is generally 500m/s, the particles collide the surface of the workpiece to form a coating, and the bonding strength (more than 80 Mpa) is required for, the gas bore lance cannot meet the requirement under the condition of low porosity (less than 1%). Moreover, the common inner-hole supersonic flame spray gun only sprays corresponding to a workpiece which can rotate. However, many workpieces to be sprayed with inner hole surfaces are difficult to rotate or cannot rotate, and even one workpiece has multiple inner holes to be sprayed, so that many inner holes cannot be sprayed. The prior inner-hole supersonic speed spray gun is basically of an external ignition type. External ignition it is very difficult for a fuel gun to introduce a flame into a combustion chamber for combustion, creating a high velocity flame stream.

The invention content is as follows:

the technical problem to be solved by the invention is as follows: the defects of the prior art are overcome, and the gas ignition type inner hole supersonic speed spray gun is reasonable in design, can ignite in stages, is stable in flame and improves the spraying angle.

The technical scheme of the invention is as follows:

here is a copy of the claims, abbreviated.

The invention has the beneficial effects that:

1. the invention firstly introduces combustible gas to carry out primary ignition, and then introduces fuel oil to carry out secondary combustion after flame is introduced into the combustion chamber, thereby realizing the purpose of forming high-speed flame flow by the ignition of the spray gun and solving the problem of ignition of the external ignition type spray gun.

2. The invention can form spraying directions with different included angles with the axial direction of the spray gun by changing the connector, and the spraying effect is best for the spray gun with the through hole having an included angle of 90 degrees. A spray gun structure with a small angle of 60 degrees or 45 degrees can be selected for blind hole spraying to finish the blind hole spraying.

3. The invention can be connected with a multi-channel mixing rotator to realize the axial rotation of the spray gun, thereby becoming a rotary spray gun.

4. The invention has reasonable design, can ignite in stages, has stable flame, wide application range and good economic benefit after popularization, and can change the injection angle.

Description of the drawings:

FIG. 1 is a schematic structural diagram of a gas ignition type supersonic internal-hole spray gun.

The specific implementation mode is as follows:

example (b): referring to fig. 1, 1-cooling water inlet pipe, 2-oxygen conveying pipe, 3-gun body, 4-gun barrel, 5-gun barrel pressing cap, 6-powder feeding port, 7-connector, 8-combustion chamber, 9-stabilizer, 10-fuel oil conveying pipe, 11-gas conveying pipe and 12-cooling water outlet pipe.

Gas ignition formula hole supersonic speed spray gun, including rifle body 3, barrel 4, stabiliser 9, combustion chamber 8 and connector 7, wherein: the combustion chamber 8 is located in the inner cavity of the gun body 3, the outlet of the combustion chamber 8 is communicated with the gun barrel 4, the gun barrel 4 is located in the inner cavity of the connector 7, an igniter and three gas channels are arranged on a powder feeding port 69 which penetrates through the wall of the gun barrel 4, the inlets of the three gas channels are respectively communicated with the oxygen conveying pipeline 2 and the fuel gas conveying pipeline 11 of the fuel gas conveying pipeline 10, the outlets of the three gas channels are respectively communicated with the inlet of the combustion chamber 8, a cooling water channel is arranged on the gun body 3 and is communicated with the cooling water inlet pipe 1, a gap is arranged between the combustion chamber 8 and the gun body 3 and is respectively communicated with the cooling water channel and the cooling water outlet pipe 12, and cooling water circulation is formed.

A barrel pressing cap 5 is arranged between the barrel 4 and the connector 7, a sealing ring is arranged on the contact surface of the voltage stabilizer 9 and the gun body 3, and a sealing ring is arranged on the contact surface of the gun body 3 and the connector 7.

The working process of the invention is as follows:

1. firstly, cooling water is introduced for circulating cooling.

2. And then oxygen and gas are respectively introduced from the oxygen conveying pipeline 2 and the gas conveying pipeline 11, the introduced oxygen is mixed by the pressure stabilizer 9 and then enters the combustion chamber 8, and the mixture is discharged from the gun barrel 4 through the connector 7.

3. The mixed gas is ignited by an igniter, and flame can be instantly introduced into the combustion chamber 8 after ignition due to the low-pressure mixed gas, so that primary ignition combustion is completed.

4. Then kerosene is introduced to complete secondary combustion, and finally a fuel gas inlet is closed to complete combustion conversion.

Finally, the oxygen and fuel supply is increased, the working state is entered, and then the powder is conveyed for spraying.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent variations and modifications made to the above embodiment according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. The utility model provides a gas ignition formula hole supersonic speed spray gun, includes the rifle body, barrel, stabiliser, combustion chamber and connector, characterized by: the combustion chamber is located in the inner chamber of the gun body, the export of combustion chamber with the barrel intercommunication, the barrel is located in the inner chamber of connector, runs through the body wall of barrel is provided with and send the powder mouth, be provided with some firearm and three gas passage on the stabiliser, it is three gas passage's entry respectively with oxygen pipeline, fuel oil pipeline and gas pipeline intercommunication, it is three gas passage's export respectively with the entry intercommunication of combustion chamber, be provided with the cooling water passageway on the gun body, the cooling water passageway advances the pipe intercommunication with the cooling water, the combustion chamber with be provided with the clearance between the gun body, the clearance respectively with cooling water passageway and cooling water exit tube intercommunication form the cooling water circulation.

2. The gas-fired inner bore supersonic lance of claim 1, wherein: a gun barrel pressing cap is arranged between the gun barrel and the connector, a sealing ring is arranged on the contact surface of the voltage stabilizer and the gun body, and a sealing ring is arranged on the contact surface of the gun body and the connector.