A plasma flame ablation generator

Abstract

The utility model discloses a plasma flame ablation generator, including a front end shell, an insulating shell and a gun air inlet joint, a gun air inlet joint is arranged at the rear end of the insulating shell, an insulating isolation sleeve is arranged in the insulating shell, a cathode rod is arranged in the insulating isolation sleeve, a cathode is connected to the left end of the cathode rod, an airflow ring is sleeved on the left outer circle of the cathode, an anode body is arranged on the left side of the airflow ring, a front end shell is connected to the left side of the anode body, an anode nozzle is arranged in the front end shell, a front end powder delivery section is arranged on the left side of the anode nozzle, and a front end powder delivery section is arranged. The utility model generates a plasma jet by a plasma spray gun, and heats the gas by igniting an arc with a high-frequency spark, ionizes the gas, and compresses the arc to generate a non-transfer plasma arc. After the high-temperature plasma gas is ejected from the nozzle, the volume expands rapidly to form a high-temperature and high-speed plasma jet. It is easy to use and simple to operate, and can realize testing in different scenarios.

Description

Technical Field

[0001] The utility model relates to a spraying device, in particular to a plasma flame ablation generator, belonging to the technical field of thermal spraying. Background Art

[0002] High-pressure turbine blades are the components with the worst working conditions in turbofan engines. They not only bear the centrifugal force and vibration load of the rotor blades themselves, but also extreme thermal stress, and are very susceptible to damage. When performing performance tests on engine blades, the only common tools are gas flame guns or high-temperature sintering test furnaces, and plasma flame generators are not used. At the same time, they rarely have the function of loading various ion atmospheres. Utility Model Content

[0003] The technical problem to be solved by the utility model is: to overcome the deficiencies of the prior art and provide a plasma flame ablation generator, wherein a plasma jet is generated by a plasma spray gun, and after high-temperature plasma gas is ejected from a nozzle, the volume expands rapidly to form a high-temperature and high-speed plasma jet, and the utility model has the function of loading gas, liquid, and solid powder, and is easy to use and simple to operate.

[0004] The technical solution adopted by the utility model to solve the technical problem is:

[0005] A plasma flame ablation generator comprises a front end shell, an insulating shell and a gun air inlet joint, wherein a gun air inlet joint is arranged at the rear end of the insulating shell, an insulating isolation sleeve is arranged in the insulating shell, a cathode rod is arranged in the insulating isolation sleeve, the left end of the cathode rod is connected to the cathode through a thread, an air flow ring is sleeved on the left outer circle of the cathode, an anode body is arranged on the left side of the air flow ring, and the anode body is fixedly connected to the insulating shell by bolts, the left side of the anode body is connected to the front end shell by bolts, an anode nozzle is arranged in the front end shell, a front end powder feeding section is arranged on the left side of the anode nozzle, a combustion chamber is arranged in the middle of the front end powder feeding section, and the combustion chamber is located in the front end shell.

[0006] An insulating airflow ring jacket is arranged outside the airflow ring, and the insulating airflow ring jacket is located between the insulating shell and the cathode rod.

[0007] The outside of the front powder delivery section is connected with a water return nut through threads.

[0008] The anode body is connected with an anode rod through threads, the anode rod is connected to the positive electrode of the cable, and the cathode rod is connected to the negative electrode of the cable.

[0009] A gas interface and a liquid interface are arranged on the front end housing.

[0010] The front end powder feeding section is provided with a powder feeding port.

[0011] The front end powder delivery section is fixedly connected to the front end housing through a powder delivery connecting nut.

[0012] The positive beneficial effects of the utility model are:

[0013] 1. The utility model generates a plasma jet by a plasma spray gun. The electrode and nozzle of the spray gun are respectively connected to the positive and negative poles of a rectifier power supply, and a working gas is supplied to the spray gun. The arc is ignited by a high-frequency spark, and the arc heats the gas to a very high temperature to ionize the gas. Under the action of thermal contraction effect, self-magnetic contraction effect and mechanical effect, the arc is compressed to generate a non-transferable plasma arc. After the high-temperature plasma gas is ejected from the nozzle, its volume expands rapidly to form a high-temperature and high-speed plasma jet. It has the function of loading gas, liquid and solid powder, and can realize tests in different scenarios. It is easy to use and simple to operate.

[0014] 2. The utility model loads particles through the powder feeding port and injects them into the spray gun as ablative particles. At the same time, the spray gun can be mixed with various atmospheres and various liquids, such as water, salt water, alcohol and other liquids. Auxiliary gas is introduced through the interface 1 to perform secondary acceleration on the flame flow of the generator and accelerate the atomization of the added liquid. The overall spray gun adopts a circulating water cooling method, which is convenient for cooling the generator body and prolonging the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 for Figure 1 Left view of

[0017] Figure 3 for Figure 2 Cross-section of the middle AA;

[0018] Among them: 1, front end shell, 2-front end powder delivery section, 3-powder delivery section connecting nut, 4-water return nut, 5-insulating shell, 6-insulating isolation sleeve, 7-insulating air flow ring jacket, 8-air flow ring, 9-gun air inlet connector, 10-anode body, 11--12 cathode, 13-cathode rod, 14-anode rod, 15-anode nozzle, 16-combustion chamber, A1-gas interface, B1-liquid interface, C1-mixed gas interface, D1-cathode water return port, E1-anode water inlet. DETAILED DESCRIPTION

[0019] The utility model is further explained and illustrated below in conjunction with the accompanying drawings:

[0020] For example, see Figure 1-Figure 3A plasma flame ablation generator comprises a front end shell 1, an insulating shell 5 and a gun air inlet joint 9, wherein the gun air inlet joint 9 is arranged at the rear end of the insulating shell 5, an insulating isolation sleeve 6 is arranged in the insulating shell 5, a cathode rod 13 is arranged in the insulating isolation sleeve 6, a cathode 11-12 is connected to the left end of the cathode rod 13 by a thread, an air flow ring 8 is sleeved on the left outer circle of the cathode 11-12, an anode body 10 is arranged on the left side of the air flow ring 8, and the anode body 10 is fixedly connected to the insulating shell 5 by bolts, the front end shell 1 is connected to the left side of the anode body 10 by bolts, an anode nozzle 15 is arranged in the front end shell 1, a front end powder feeding section 2 is arranged on the left side of the anode nozzle 15, a combustion chamber 16 is arranged in the middle of the front end powder feeding section 2, and the combustion chamber 16 is located in the front end shell 1.

[0021] An insulating airflow ring jacket 7 is provided outside the airflow ring 8 , and the insulating airflow ring jacket 7 is located between the insulating shell 5 and the cathode rod 13 .

[0022] The outside of the front powder delivery section 2 is connected with a water return nut 4 through threads.

[0023] An anode rod 14 is connected to the anode body 10 by threads. The anode rod 14 is connected to the positive electrode of the cable, and the cathode rod 13 is connected to the negative electrode of the cable.

[0024] A gas interface A1 and a liquid interface B1 are provided on the front housing 1 .

[0025] A powder delivery port is provided on the front powder delivery section 2.

[0026] The front powder delivery section 2 is fixedly connected to the front housing 1 through a powder delivery connecting nut 3 .

[0027] In the above description, a plasma jet (arc flame flow) is generated by a plasma spray gun (plasma arc generator). The electrode (cathode) and nozzle (anode) of the spray gun are connected to the positive and negative electrodes of a rectifier power supply, respectively. Working gas (Ar, N2, etc.) is supplied to the spray gun, and the arc is ignited by a high-frequency spark. The arc heats the gas to a very high temperature, ionizing the gas. Under the action of thermal contraction effect, self-magnetic contraction effect and mechanical effect, the arc is compressed to generate a non-transfer plasma arc; after the high-temperature plasma gas is ejected from the nozzle, its volume expands rapidly to form a high-temperature and high-speed plasma jet.

[0028] In the above description, the generator can load particles through the powder feeding port and inject them into the spray gun as ablative particles. At the same time, the spray gun can mix various atmospheres and add various liquids, such as water, saline, alcohol and other liquids. Auxiliary gas (usually nitrogen) is introduced through the gas interface to perform secondary acceleration on the generator flame flow and accelerate the atomization of the added liquid.

[0029] Working principle:

[0030] A gun air inlet connector 9 is installed at the rear end of the generator insulating shell 5. The connector is a mixed gas interface, which can be used to introduce plasma gas (generally argon, nitrogen and other gases or a variety of mixed gases); the insulating isolation sleeve 6 is installed in the insulating shell 5, and the cathode rod 13 is installed inside the insulating isolation sleeve; the insulating airflow ring sleeve 7 is installed between the insulating shell 5 and the cathode rod 13, and the airflow ring is installed in the insulating airflow ring sleeve 7; the cathode 11-12 is connected to the cathode rod 13 through a thread; the anode body 10 is connected to the insulating shell 5 by bolts; the anode nozzle 15 is installed in the front end shell 1, and the front end shell 1 is connected to the anode body 10 by bolts; the combustion chamber 16 is installed in the front end powder feeding section 2 and the front end shell 1, and the powder feeding connecting nut 3 connects the front The end powder delivery section 2 is pressed on the front end shell 1; the return nut 4 is connected to the front end powder delivery section 2 through a thread; the anode rod 14 is fixed to the anode body 10 by bolts; the plasma gas enters the cavity between the insulating shell 5 and the insulating air flow ring jacket through the mixed gas interface for the first gas distribution, and then enters the cavity between the air flow ring 8 and the insulating air flow ring jacket 7 through the holes on the insulating air flow ring jacket 7 for the second gas distribution; the plasma gas after the two distributions evenly enters the chambers of the anode nozzle 15 and the cathode 11-12 through the small holes on the air flow ring 8; the cathode rod 13 is connected to the negative water cable, and the anode rod 14 is connected to the positive water cable; by connecting the positive and negative electrodes to the cathode and the anode respectively, through The high-frequency arc is struck to ionize the plasma gas. After the high-temperature plasma gas is ejected from the nozzle, its volume expands rapidly to form a high-temperature and high-speed plasma jet. The auxiliary gas (nitrogen or other gas) is connected through the interface 1 and enters the inside of the spray gun through the inclined hole on the anode nozzle 15. The interface 2 can be connected to various atmospheric liquids, such as water, salt water, alcohol and other liquids, which enter the straight hole on the anode nozzle 15 that is connected to the inclined hole, and are atomized and enter the inside of the spray gun through the blowing of the auxiliary gas. The plasma jet is compressed, accelerated and expanded in the internal cavity of the combustion chamber 16, and then accelerated and amplified again to form an ion jet with a larger diameter and a higher speed. The cooling water enters the anode rod 14 through the anode water inlet, and then passes through the holes on the outer circle of the anode body 10. Enters into the inner and outer water holes of the front end shell 1; the outer water holes of the front end shell 1 are connected with the inner and outer water holes of the front end powder feeding section 2, water enters from the rear end of the inner and outer water holes of the front end powder feeding section 2, returns to the inner layer of the front end powder feeding section 2 after reaching the front end, and then enters the cavity between the combustion chamber 16 and the front end powder feeding section 2; water passes through the inner water holes of the front end shell 1, enters the water holes in the anode nozzle, and then flows from the cavity between the front end shell 1 and the combustion chamber 16 into the inner water holes of the anode body 10; water enters into the cathode rod 13 through the internal water holes of the insulating airflow ring sleeve 7, and flows out from the rear end of the cathode rod, forming a good spray gun cooling water circulation; various test solid powders can be connected from the powder feeding port on the front end powder feeding section 2.

[0031] Among them, the generator parameters are configured as follows:

[0032] ①, Ignition mode: automatic; ②, Plasma power: plasma power between 50-120kw; ③, Plasma working gas: nitrogen (recommended) or compressed air; Inlet pressure 0.8--1.0Mpa, working gas pressure 0.3--0.4Mpa; ④, Plasma flame diameter: φ50mm-φ30mm; ⑤, Plasma flame length adjustable: 70-200mm; ⑥, Flame speed: 100-600m / s, speed adjustable; ⑦, Flame temperature: temperature control accuracy ≤3%; ⑧, Sprayable powder types: can be added according to test requirements; Powder particle size range 10-500μm.

[0033] The utility model generates a plasma jet by a plasma spray gun, and heats the gas to a very high temperature by igniting an arc with a high-frequency spark, so that the gas is ionized. Under the action of thermal contraction effect, self-magnetic contraction effect and mechanical effect, the arc is compressed to generate a non-transferring plasma arc. After the high-temperature plasma gas is ejected from the nozzle, its volume expands rapidly to form a high-temperature and high-speed plasma jet. The utility model is easy to use and simple to operate, and can realize tests in different scenarios.

Claims

1. A plasma flame ablation generator, comprising a front end housing (1), an insulating housing (5) and a gun air inlet connector (9), characterized in that: A gun air inlet joint (9) is arranged at the rear end of the insulating shell (5), an insulating isolation sleeve (6) is arranged in the insulating shell (5), a cathode rod (13) is arranged in the insulating isolation sleeve (6), the left end of the cathode rod (13) is connected to the cathode (11-12) by a thread, an air flow ring (8) is sleeved on the left outer circle of the cathode (11-12), an anode body (10) is arranged on the left side of the air flow ring (8), and the anode body (10) is fixedly connected to the insulating shell (5) by bolts, and the left side of the anode body (10) is connected to the front shell (1) by bolts, an anode nozzle (15) is arranged in the front shell (1), a front powder feeding section (2) is arranged on the left side of the anode nozzle (15), a combustion chamber (16) is arranged in the middle of the front powder feeding section (2), and the combustion chamber (16) is located in the front shell (1).

2. A plasma flame ablation generator according to claim 1, characterized in that: An insulating airflow ring jacket (7) is provided outside the airflow ring (8), and the insulating airflow ring jacket (7) is located between the insulating shell (5) and the cathode rod (13).

3. The plasma flame ablation generator according to claim 1, characterized in that: The exterior of the front powder delivery section (2) is connected to a water return nut (4) via a thread.

4. The plasma flame ablation generator according to claim 1, characterized in that: An anode rod (14) is threadedly connected to the anode body (10); the anode rod (14) is connected to the positive electrode of the cable; and the cathode rod (13) is connected to the negative electrode of the cable.

5. The plasma flame ablation generator according to claim 1, characterized in that: A gas interface (A1) and a liquid interface (B1) are provided on the front end housing (1).

6. The plasma flame ablation generator according to claim 1, characterized in that: The front end powder delivery section (2) is provided with a powder delivery port.

7. The plasma flame ablation generator according to claim 1, characterized in that: The front powder delivery section (2) is fixedly connected to the front housing (1) via a powder delivery connecting nut (3).

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