High-temperature-resistant plasma spraying gun

Abstract

The utility model discloses a high-temperature-resistant plasma spraying gun, which belongs to the technical field of plasma spraying guns and is technically characterized by comprising a front-section gun head, a powder feeding pipe is arranged on one side of the front-section gun head and provided with a fluidization plate, a plurality of through holes are formed in one side of the fluidization plate and comprise a plurality of layers of cavities with different hole diameters, and a plurality of through holes are formed in the middle of the fluidization plate. The powder feeding pipe comprises a base layer and a protective layer, a heat insulation layer is filled between the base layer and the protective layer, the through hole comprises an inlet end, a middle part and an outlet end, the hole diameter of the middle part is the largest, and the hole diameter of the outlet end is the smallest. And meanwhile, the performance is not changed when domestic powder is used for spraying, the coating still has the characteristics of high temperature resistance, wear resistance and the like, and the problems of powder corrosion and high cost are solved.

Description

Technical Field

[0001] This utility model belongs to the field of plasma spraying gun technology, specifically relating to a high-temperature resistant plasma spraying gun. Background Technology

[0002] Plasma spraying is a technology for strengthening and modifying the surface of materials. It can give the substrate surface properties such as wear resistance, corrosion resistance, high temperature oxidation resistance, electrical insulation, heat insulation, radiation protection, friction reduction and sealing. It is generally used in conjunction with a plasma spraying gun.

[0003] According to the inspection institute, a high-power hot cathode supersonic plasma spray gun, announced under announcement number CN110302909B, can improve the service life of electrodes and reduce the cost of anode use. The maximum power of the spray gun reaches 250kW, which improves the spraying efficiency. However, the spray gun operates at high temperatures, and the powder is prone to corroding the powder feeding tube, leading to damage to the powder feeding tube. At the same time, the existing spray guns rely too much on imported spraying powder, resulting in high costs, long supply cycles, and high supply chain risks. Utility Model Content

[0004] The purpose of this invention is to provide a high-temperature resistant plasma spray gun to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-temperature resistant plasma spray gun, including a front gun head, a powder feeding pipe on one side of the front gun head, a fluidizing plate on the powder feeding pipe, a plurality of through holes on one side of the fluidizing plate, the through holes including multiple cavities of different diameters, the powder feeding pipe including a base layer and a protective layer, and a heat insulation layer filling the space between the base layer and the protective layer.

[0006] Preferably, the through hole includes an inlet end, a middle part, and an outlet end, with the middle part having the largest diameter and the outlet end having the smallest diameter.

[0007] Preferably, the aperture at the inlet end is 50 μm, the aperture at the middle part is 80 μm, and the aperture at the outlet end is 30 μm.

[0008] Preferably, the ratio of the inlet end, the middle part, and the outlet end within the through hole is 3:5:2.

[0009] Preferably, the fluidizing plate is inclined at an angle of degrees.

[0010] Preferably, both the base layer and the protective layer are titanium alloy layers, and the thermal insulation layer is an aerogel layer.

[0011] Preferably, the fluidizing plate is made of titanium alloy.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. This utility model reduces reliance on imports by using a fluidizing plate and multi-layer powder feeding pipes, which can significantly reduce raw material costs and increase enterprise profit margins. At the same time, the performance remains unchanged when using domestically produced powder for spraying, and it still has the characteristics of high temperature resistance and wear resistance, thus solving the problems of powder erosion and high cost.

[0014] 2. This utility model achieves a gradient distribution of the aperture of the through hole by providing an inlet end, a middle part and an outlet end, thereby achieving uniform gas distribution. Attached Figure Description

[0015] Figure 1 This is a perspective view of the present utility model;

[0016] Figure 2 This is a partial cross-sectional view of the present invention;

[0017] Figure 3 This is a cross-sectional view of the fluidizing plate of this utility model.

[0018] In the diagram: 1. Front nozzle; 2. Powder feeding pipe; 201. Base layer; 202. Insulation layer; 203. Protective layer; 3. Fluidized plate; 4. Through hole; 401. Inlet end; 402. Middle section; 403. Outlet end. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figures 1-3 This utility model provides a high-temperature resistant plasma spray gun, including a front gun head 1. The front gun head 1 can meet the spraying requirements of existing components and is an existing gun head, which will not be described in detail here. A powder feeding pipe 2 is provided on one side of the front gun head 1. A fluidizing plate 3 is inclined on the powder feeding pipe 2 at an angle of 30 degrees, which can use gravity to assist powder flow. Multiple through holes 4 are opened on one side of the fluidizing plate 3, and the through holes 4 have a gradient distribution of pore size. The powder feeding pipe 2 includes a base layer 201 and a protective layer 203. A heat insulation layer 202 is filled between the base layer 201 and the protective layer 203. Both the base layer 201 and the protective layer 203 are made of titanium alloy. The fluidizing plate 3 is made of TA2 industrial pure titanium (titanium content ≥99.2%) through powder metallurgy sintering process. The porosity of the fluidizing plate 3 is adjusted to 35-40% by sintering pressure, thereby ensuring a gas permeability of 0.8-1.2L / (min·cm). 2Within the range of kPa, the insulation layer 202 is an aerogel layer. Under long-term operating temperatures ≤600℃, it has both high temperature resistance and powder erosion resistance. During use, a porous titanium alloy fluidizing plate 3 is installed in the powder feeding pipe, and 0.2-0.5MPa argon gas is introduced to form a gas-solid two-phase flow, reducing the angle of repose of domestic powder from 45° to 32°, preventing pipe blockage. It can be adapted to domestic powder, reducing the financial pressure caused by relying on imported spraying powder.

[0021] In this embodiment, the through hole 4 includes an inlet end 401, a middle part 402, and an outlet end 403. The middle part 402 has the largest diameter, and the outlet end 403 has the smallest diameter. The inlet end 401 has a diameter of 50 μm, the middle part 402 has a diameter of 80 μm, and the outlet end 403 has a diameter of 30 μm. The ratio of the inlet end 401, the middle part 402, and the outlet end 403 in the through hole 4 is 3:5:2, which makes the gas evenly distributed. High-temperature fluororubber O-rings can be used to seal the edge of the fluidizing plate 3 to prevent gas leakage.

[0022] The working principle of this invention is as follows: A porous titanium alloy fluidizing plate 3 is installed inside the powder feeding pipeline. The fluidizing plate 3 is made of TA2 industrial pure titanium (titanium content ≥99.2%) through powder metallurgy sintering process. The porosity of the fluidizing plate 3 is adjusted to 35-40% by adjusting the sintering pressure, thereby ensuring a gas permeability of 0.8-1.2 L / (min·cm). 2 The pressure is within the range of kPa, and then 0.2-0.5MPa argon gas is introduced to form a gas-solid two-phase flow, which reduces the angle of repose from 45° to 32°, thereby reducing the angle of repose of the domestic powder and preventing pipeline blockage. At the same time, the performance remains unchanged when the domestic powder is used for spraying, and it still has the characteristics of high temperature resistance and wear resistance.

[0023] The electronic components and modules used in this utility model can all be parts that are commonly used in the market and can achieve the specific functions in this case. The specific models and sizes can be selected and adjusted according to actual needs.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A high temperature resistant plasma spraying gun comprising a front gun head (1), one side of the front gun head (1) is provided with a powder feeding pipe (2), characterized in that: The powder feeding pipe (2) is provided with a fluidizing plate (3), and a plurality of through holes (4) are opened on one side of the fluidizing plate (3). The through holes (4) include multiple cavities with different pore sizes. The powder feeding pipe (2) includes a base layer (201) and a protective layer (203). A heat insulation layer (202) is filled between the base layer (201) and the protective layer (203).

2. A high temperature resistant plasma spray gun as defined in claim 1, wherein: The through hole (4) includes an inlet end (401), a middle part (402) and an outlet end (403), with the middle part (402) having the largest diameter and the outlet end (403) having the smallest diameter.

3. A high temperature resistant plasma spray gun as defined in claim 2, wherein: The aperture of the inlet end (401) is 50 μm, the aperture of the middle part (402) is 80 μm, and the aperture of the outlet end (403) is 30 μm.

4. A high temperature resistant plasma spray gun as defined in claim 2, wherein: The ratio of the inlet end (401), the middle part (402), and the outlet end (403) within the through hole (4) is 3:5:

2.

5. A high temperature resistant plasma spray gun as defined in claim 1, wherein: The fluidizing plate (3) is inclined at an angle of 30 degrees.

6. A high temperature resistant plasma spray gun as defined in claim 1, wherein: The base layer (201) and the protective layer (203) are both titanium alloy layers, and the thermal insulation layer (202) is an aerogel layer.

7. A high-temperature resistant plasma spraying gun according to claim 5, characterized in that: The fluidizing plate (3) is made of titanium alloy.

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