CN216905416U

CN216905416U - Ceramic plasma torch and combined plasma torch powder making device

Info

Publication number: CN216905416U
Application number: CN202123371146.1U
Authority: CN
Inventors: 胡雷
Original assignee: Suzhou Hanxiao Plasma Technology Co ltd
Current assignee: Suzhou Hanxiao Plasma Technology Co ltd
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2022-07-05
Anticipated expiration: 2031-12-30

Abstract

The utility model discloses a ceramic plasma torch and a combined plasma torch powder making device, wherein the combined plasma torch powder making device comprises a ceramic plasma torch, an adjustable powder gun and a reaction chamber; an opening is arranged at the central position of the upper end of the reaction chamber, the adjustable powder gun can extend into the reaction chamber along the opening, and the adjustable powder gun can be lifted up and down in the vertical direction; a plurality of ceramic plasma torches are arranged around the adjustable powder gun, the ceramic plasma torches are arranged on the outer wall of the upper end of the reaction chamber at an inclined angle, and plasma flames sprayed by a spray head of each ceramic plasma torch are converged in the reaction chamber; an air inlet pipe is arranged on the ceramic plasma torch. The combined plasma torch powder-making device has the advantages of larger heating temperature range, higher spheroidization rate, greatly prolonged service life, effectively improved powder productivity and capability of avoiding the torch pipe blockage phenomenon of the plasma torch.

Description

Ceramic plasma torch and combined plasma torch powder making device

Technical Field

The utility model belongs to the field of plasma powder making, and particularly relates to a ceramic plasma torch and a combined plasma torch powder making device.

Background

The high-frequency induction plasma powder making device takes a Radio Frequency (RF) plasma technology as a core technology, various gases are subjected to ohmic heating through the induction action of a radio frequency electromagnetic field to generate plasma, and the principle of spheroidizing powder is that irregular powder passing through a plasma torch is rapidly melted at high temperature (10000K) so that spherical particles are formed by surface tension in the descending process.

As the radio frequency plasma powder manufacturing equipment has more debugging parameters and complex working conditions, the requirement on the quality of operating technicians is very high. At present, radio frequency plasma powder manufacturing equipment mostly depends on experimental modes to obtain spheroidized powder of different materials, a database for preparing powder spheroidization is formed by carrying out data accumulation and mining analysis of debugging various parameters on the production of different powder, theory and experiment are combined, and a large amount of operation experience is accumulated, so that the optimal operation parameters of different spheroidized powder are obtained. Therefore, the operation safety and control precision of the whole set of equipment need to be improved, the repeatability of the experimental state is ensured, and the automation level of the experimental system is improved.

At present, a single rectangular tube is still matched with a single powder gun in the high-frequency induction plasma powder making technology, the size of equipment is limited, the capacity cannot be expanded, meanwhile, different properties of powder cause the powder to have different properties in a plasma torch, for example, part of light powder cannot be smoothly fed or is adsorbed on a wall surface to form powder hanging, for example, part of powder is easy to agglomerate, the dispersibility is poor, for example, the powder gun in the plasma torch is easy to be ablated, even the powder is melted and slagged in the powder gun, and the powder gun is thoroughly blocked. For example, the high temperature region in the plasma torch is generally in a ceramic or quartz glass tube, and although these materials have good temperature resistance and thermal shock resistance, due to the process and the materials, and the high temperature of the plasma close to ten thousand degrees centigrade, cracks are easy to appear in the use process. All of the above results in difficulty in large-scale popularization of the plasma milling process.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a ceramic plasma torch and a combined plasma torch powder-making device, which have the advantages of larger heating temperature range, higher spheroidization rate, greatly prolonged service life, effectively improved powder productivity and capability of avoiding the phenomenon of blockage of a torch tube of the plasma torch.

In order to achieve the purpose, the technical scheme of the utility model is to design a combined plasma torch powder-making device, which comprises a ceramic plasma torch, an adjustable powder gun and a reaction chamber; an opening is formed in the center of the upper end of the reaction chamber, the adjustable powder gun can extend into the reaction chamber along the opening, and the adjustable powder gun can lift up and down in the vertical direction; a plurality of ceramic plasma torches are arranged around the adjustable powder gun, the ceramic plasma torches are arranged on the outer wall of the upper end of the reaction chamber at an inclined angle, and plasma flames sprayed by a spray head of each ceramic plasma torch converge in the reaction chamber; and the ceramic plasma torch is provided with an air inlet pipe.

Furthermore, a valve is arranged on an outlet pipeline at the lower end of the reaction chamber, and the outlet pipeline at the lower end of the reaction chamber is connected with a powder collecting tank.

Furthermore, the included angle between the ceramic plasma torch and the horizontal plane is 15-60 degrees.

Furthermore, a plurality of the ceramic plasma torches are respectively provided with an independent high-frequency power supply.

Furthermore, the outer wall of the adjustable powder gun is provided with a water cooling structure, and the water cooling structure is provided with a temperature sensor and a differential pressure sensor.

Further, the reaction chamber is a water-cooling jacket reaction chamber.

A ceramic plasma torch comprises a plasma torch shell, a ceramic layer, an induction coil and a torch tube; the plasma torch outer shell comprises an end cover and a plasma torch shell body; an end cover is fixed on the upper part of the plasma torch shell; the plasma torch comprises a torch tube, an induction coil, a ceramic layer and a plasma torch shell, wherein the torch tube is positioned in the plasma torch shell, the induction coil is spirally wound on the outer wall of the torch tube, and the ceramic layer is coated outside the induction coil and arranged in the plasma torch shell; the upper part of the torch pipe is connected with an air inlet pipe; the induction coil is connected with a high-frequency power supply.

Further, the induction coil is hollow inside, and cooling liquid can flow through the hollow induction coil.

The utility model has the advantages and beneficial effects that:

1. the temperature range is larger, and the nodularity is higher

The adjustable powder gun and the plasma torch are separated, the inner wall surface of powder in the plasma torch can be prevented from being accumulated to form powder hanging, the constraint of a rectangular tube is avoided, a high-temperature area is larger, the heat of the powder obtained in the high-temperature area is more uniform, fine powder is not easily wrapped by cooling gas, the high-temperature area is bypassed from the side wall, and therefore the heating is insufficient, and the spheroidization rate is low.

2. Greatly prolongs the service life of the equipment

The high-temperature zone moves downwards into the reaction chamber, so that the space of the reaction chamber is larger, the water-cooling jacket can effectively protect the metal shell, the ceramic rectangular tube has better cooling effect under the action of high-speed jet airflow, is not easy to burn, has no powder hanging condition, can greatly prolong the service life, adopts three plasma torches due to uniform consideration, and can arrange 4-6 plasma torches according to power and actual conditions.

3. Can greatly improve the powder productivity

Because the prior plasma torch is directly amplified and does not have an amplification effect, the diameter of the plasma torch tube is simply increased, the productivity can not be increased on a same scale under the condition of not influencing the spheroidization rate, and when the plasma torch is influenced by the arrangement of the rectangular tube and the induction coil, powder can not be effectively dispersed and spread in a small space, so that a large amount of powder is not heated and melted, and the spheroidization rate can not be increased by simply increasing the power, but the powder which is not dispersed is melted together easily, so that irregular large particles are formed. The utility model concentrates the high-temperature zone in the reaction chamber, the heat generated by the three plasma torches can form a stable high-temperature zone in a larger reaction chamber space, the flow of the powder is increased, and the powder can be fully dispersed and heated in the reaction chamber, so the productivity can be effectively increased.

4. The regulating capacity is greatly increased

The plasma torch adopts the design of inlaying the copper coil in pottery, can serialization production to guarantee the commonality of plasma torch, in case one of them goes wrong, can dismantle very fast and change. The load can also be adjusted by switching on and off the plasma torch according to the temperature of the reaction chamber, and the plasma torch has stronger adjusting capacity. In addition, cooling liquid can flow through the inside of the induction coil, so that the over-high temperature of the induction coil is avoided; the induction coil is spirally wound outside the torch tube to ensure that no short circuit occurs between the induction coils, and therefore, the ceramic also has the function of separating the spiral induction coils.

5. The rectangular tube can not be blocked

Because powder is not introduced into the plasma rectangular tube any more, the inner wall surface of the plasma torch tube cannot be subjected to the powder hanging phenomenon, so that the limitation of powder feeding is greatly reduced, and because some light and poor-fluidity powder is easily influenced by gas in the plasma torch, the powder is inevitably adhered to the inner wall surface or bypasses a high-temperature area to cause the problems of rectangular tube accumulation and blockage, low spheroidization rate and the like, the powder gun is independently introduced into the reaction chamber, so that the problem is thoroughly solved.

Drawings

Fig. 1 is a schematic front view (partially in section) of the present invention.

Fig. 2 is a schematic top view of the present invention.

Fig. 3 is a cross-sectional view of a ceramic plasma torch.

The plasma torch comprises a ceramic plasma torch 1, an end cover 1-1, a plasma torch shell 1-2, a ceramic layer 1-3, an induction coil 1-4, a torch tube 1-5, an adjustable powder gun 2, an air inlet tube 3, a high-frequency power supply 4, a water-cooling jacket reaction chamber 5, a valve 6, a powder collecting tank 7 and a connecting piece 8.

Detailed Description

The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

Example (b):

as shown in fig. 1 and fig. 2, the combined plasma torch powder making device comprises a ceramic plasma torch 1, an adjustable powder gun 2, an air inlet pipe 3, a high-frequency power supply 4, a water-cooling jacket reaction chamber 5, a valve 6 and a powder collecting tank 7;

an opening is arranged at the central position of the upper end of the water-cooling jacket reaction chamber 5, the adjustable powder gun 2 can extend into the water-cooling jacket reaction chamber 5 along the opening, and the adjustable powder gun 2 can be lifted up and down in the vertical direction; three ceramic plasma torches 1 are arranged around the adjustable powder gun 2, the ceramic plasma torches 1 are arranged on the outer wall of the upper end of the water-cooling jacket reaction chamber, and the three ceramic plasma torches 1 are distributed on three corners of an equilateral triangle which takes the point where the axis of the adjustable powder gun 2 passes through as the center of a circle; the upper end of the water-cooling jacket reaction chamber 5 is conical, so that the included angles between the three ceramic plasma torches 1 and the horizontal plane are 15-60 degrees; the three ceramic plasma torches 1 are respectively provided with an independent high-frequency power supply 4, and the three ceramic plasma torches 1 are respectively provided with an air inlet pipe 3;

a valve 6 is arranged on an outlet pipeline at the lower end of the water-cooling jacket reaction chamber 5, and an outlet pipeline at the lower end of the water-cooling jacket reaction chamber 5 is connected with a powder collecting tank 7.

When the equipment is used, powder enters the water-cooling jacket reaction chamber 5 through the adjustable powder gun 2; argon or other process gases enter the inside of a water-cooling jacket reaction chamber 5 along an air inlet pipe 3 of a ceramic plasma torch 1, a high-speed spray head is arranged at the center of the ceramic plasma torch, the inlet air pressure is between 0.2MPaA and 1MPaA, the flow is 30-200 slpm, the adjustment is carried out according to the length of the tail end of the plasma torch, the plasma torch is ensured not to be extinguished as a front end, when the plasma torch forms stable plasma flame, the power is gradually increased through a temperature rising curve, the temperature rising rate of less than 30 ℃ per minute is used for adjustment, when the required power is reached, the flow rate of argon is gradually increased, the plasma flame is lengthened until the tail end extends into the water-cooling jacket reaction chamber 5, at the moment, the adjustable powder gun 2 can be adjusted to extend into the upper end of the tail flame of the plasma torch for powder feeding, and the adjustable powder gun 2 is forcibly cooled by high-pressure cooling water; be equipped with temperature and pressure differential sensor on adjustable powder rifle 2's cooling structure, when pressure differential change and temperature variation appear, adjustable powder rifle 2 automatic lifting avoids being burnt.

As shown in fig. 3, the ceramic plasma torch 1 is connected to the high frequency power supply 4 through a connector 8; the ceramic plasma torch 1 comprises an end cover 1-1, a plasma torch shell 1-2, a ceramic layer 1-3, an induction coil 1-4 and a torch tube 1-5; an end cover 1-1 is fixed on the upper part of the plasma torch shell 1-2, a torch tube 1-5 is arranged in the plasma torch shell 1-2, and an air inlet pipe 3 penetrates through the end cover 1-1 and is communicated with the torch tube 1-5; the induction coil 1-4 is spirally wound on the outer wall of the torch tube 1-5, the ceramic layer 1-3 is coated outside the induction coil 1-4, the ceramic layer 1-3 is arranged inside the plasma torch shell 1-2, and the induction coil 1-4 is connected with the high-frequency power supply 4; the induction coils 1-4 are hollow inside, and cooling liquid can flow through the hollow induction coils 1-4.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, it is possible to make various improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. The utility model provides a modular plasma torch powder process device which characterized in that: comprises a ceramic plasma torch, an adjustable powder gun and a reaction chamber; an opening is formed in the center of the upper end of the reaction chamber, an adjustable powder gun can extend into the reaction chamber along the opening, and the adjustable powder gun can lift up and down in the vertical direction; a plurality of ceramic plasma torches are arranged around the adjustable powder gun, the ceramic plasma torches are arranged on the outer wall of the upper end of the reaction chamber at an inclined angle, and plasma flames sprayed by a spray head of each ceramic plasma torch converge in the reaction chamber; and the ceramic plasma torch is provided with an air inlet pipe.

2. The combined plasma torch milling apparatus of claim 1, wherein: and a valve is arranged on an outlet pipeline at the lower end of the reaction chamber, and the outlet pipeline at the lower end of the reaction chamber is connected with a powder collecting tank.

3. The combined plasma torch milling apparatus of claim 1, wherein: the ceramic plasma torch and the horizontal plane form an included angle of 15-60 degrees.

4. The combined plasma torch milling apparatus of claim 1, wherein: and a plurality of ceramic plasma torches are respectively provided with an independent high-frequency power supply.

5. The combined plasma torch milling apparatus of claim 1, wherein: the adjustable powder gun outer wall is equipped with water-cooling structure, and is equipped with temperature and differential pressure sensor on the water-cooling structure.

6. The combined plasma torch milling apparatus of claim 1, wherein: the reaction chamber is a water-cooling jacket reaction chamber.

7. A ceramic plasma torch, characterized by: comprises a plasma torch shell, a ceramic layer, an induction coil and a torch tube; the plasma torch comprises a torch tube, an induction coil, a ceramic layer and a plasma torch shell, wherein the torch tube is positioned in the plasma torch shell, the induction coil is spirally wound on the outer wall of the torch tube, and the ceramic layer is coated outside the induction coil and arranged in the plasma torch shell; the upper part of the torch pipe is connected with an air inlet pipe; the induction coil is connected with a high-frequency power supply.

8. A ceramic plasma torch as claimed in claim 7, wherein: the induction coil is hollow inside, and cooling liquid can flow through the hollow induction coil.