Flame gun for preparing spherical powder particles

Abstract

The flame gun comprises a first shell, a discharging hole is coaxially formed in the middle of the first shell and is suitable for outputting a mixture of an oxidizing agent and raw material powder, a plurality of fuel holes are further formed in the first shell, the fuel holes are evenly formed in the circumferential direction of the discharging hole at intervals, and the discharging hole is used for discharging the mixture of the oxidizing agent and the raw material powder. The fuel holes are inclined to the axis of the discharge hole, and the fuel holes have the same inclined direction; wherein each fuel hole comprises a first end used for inputting fuel and a second end used for outputting fuel, in the orthographic projection of the first shell in the thickness direction, the projection of the second end is located between the projection of the first end and the projection of the discharging hole, and the midpoint of the projection of the second end is not collinear with the midpoint of the projection of the first end and the midpoint of the projection of the discharging hole.

Description

Technical Field

[0001] The present disclosure relates to the technical field of spherical silicon powder preparation, and more specifically, to a flame gun for preparing spherical powder particles. Background Art

[0002] With the development of new materials technology around the world, industrial powder materials play an irreplaceable role in modern industry. Among them, silicon dioxide has become a key industrial raw material due to its abundant reserves and easy access. Silica powder, a silicon dioxide powder that has been processed through a complex process, has high heat resistance, high insulation, good dielectric properties and low linear expansion coefficient. It is widely used in copper clad laminates, epoxy molding compounds and electrical insulation materials. In the 5G and semiconductor industries, the application of silicon powder is changing from simple fillers to functional materials, and the requirements for its performance indicators such as particle size, fluidity, and specific surface area are also increasing. The application of spherical silicon dioxide powder can significantly enhance these characteristics.

[0003] The preparation methods of spherical silica mainly include chemical method, plasma method and flame melting method. The flame melting method has become the most commonly used technology at present because of its simple process flow and large output. The production principle of this method is to use a high-temperature flame to heat the powder to the melting point. After the powder melts, it automatically forms a sphere by relying on surface tension. In view of the high melting point characteristics of silica, in the process of flame heating using natural gas as fuel, the temperature, length of the flame and the interaction time between the powder and the flame must be fully considered to ensure that the powder can fully absorb heat and achieve efficient use of energy. The spray guns currently on the market have problems such as low energy utilization, serious energy waste and unstable product quality due to design defects.

[0004] Therefore, there is an urgent need for a new flame gun for the preparation of spherical powder particles, which can effectively improve energy utilization efficiency and ensure product quality. Summary of the invention

[0005] In view of this, the present disclosure provides a flame gun for preparing spherical powder particles, which uses inclined fuel holes to guide the injected fuel to form a swirl to improve combustion efficiency.

[0006] One aspect of the present disclosure provides a flame gun for preparing spherical powder particles, comprising a first shell, a discharge hole coaxially arranged in the middle of the first shell, suitable for outputting a mixture of an oxidant and a raw material powder, a plurality of fuel holes are also arranged in the first shell, the plurality of fuel holes are evenly spaced in the circumferential direction of the discharge hole, the fuel holes are inclined to the axis of the discharge hole, and each of the fuel holes has the same inclination direction; wherein each of the fuel holes comprises a first end for inputting fuel and a second end for outputting fuel, and in the orthographic projection in the thickness direction of the first shell, the projection of the second end is located between the projection of the first end and the projection of the discharge hole, and the midpoint of the projection of the second end is not colinear with the midpoint of the projection of the first end and the projection of the discharge hole.

[0007] According to an embodiment of the present disclosure, it also includes a second shell, which is arranged on the first surface of the first shell and is suitable for connecting the input end of the discharge hole with an external material source; and the second shell is also suitable for connecting the first end of the fuel hole with an external fuel source.

[0008] According to an embodiment of the present disclosure, a feed interface is provided in the middle of the second shell, and the feed interface connects the material source and the discharge hole.

[0009] According to an embodiment of the present disclosure, the second shell is further provided with a fuel interface, and the fuel interface connects the fuel source and the fuel hole.

[0010] According to an embodiment of the present disclosure, a plurality of the above-mentioned fuel interfaces are arranged in the above-mentioned second shell; the above-mentioned second shell is also provided with a fuel cavity, and the above-mentioned fuel cavity is constructed in a ring shape to connect the plurality of the above-mentioned fuel interfaces and to connect with at least two of the above-mentioned fuel holes.

[0011] According to an embodiment of the present disclosure, a cold mass inlet and a cold mass outlet connected to an external cold mass source are provided in the first shell; a cold mass channel connected to the cold mass inlet and the cold mass outlet is also provided in the first shell, and the cold mass channel is suitable for dissipating heat from the first shell by utilizing the cold mass flowing through.

[0012] According to an embodiment of the present disclosure, the cold mass inlet and the cold mass outlet are arranged at intervals on the side wall of the first shell, and extend in the radial direction of the first shell respectively.

[0013] According to an embodiment of the present disclosure, the cold mass channel includes an arcuate groove formed on the first surface, and the arcuate groove extends around the plurality of fuel holes.

[0014] According to an embodiment of the present disclosure, a sealing plate is further included. The sealing plate is configured in a ring shape and is installed in a sealing groove formed on the first surface. The sealing plate is suitable for sealing the arc-shaped groove.

[0015] According to an embodiment of the present disclosure, a flange extending in a radial direction of the second shell is provided on the circumference of the second shell, and the flange is suitable for connecting the first shell and fixing the sealing plate in the sealing groove.

[0016] According to an embodiment of the present disclosure, a discharge hole for outputting a mixture of an oxidant and raw material powder is arranged at the center of the first shell, and a plurality of fuel holes inclined to the axis of the discharge hole are evenly spaced around the discharge hole in the first shell, wherein the fuel input end and the output end of each fuel hole are not colinear with the projection of the discharge hole in the orthographic projection in the thickness direction of the first shell, and the projection of the output end is located on the inner side of the projections of both the input end and the discharge hole, so that the sprayed fuel forms a gathered vortex, which is fully mixed with the oxidant sprayed from the discharge hole, thereby improving the combustion efficiency, and increasing the residence time of the raw material powder in the flame, thereby increasing the heat conversion efficiency, helping to reduce energy consumption, and at the same time ensuring the uniform melting and spheroidization of the raw material powder at high temperature, thereby improving the preparation quality and production efficiency of spherical powder particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0018] Figure 1 Schematically shows a perspective view of a first housing at a first viewing angle according to an embodiment of the present disclosure;

[0019] Figure 2 A schematic diagram schematically shows the orthographic projection of the fuel hole and the discharge hole in the thickness direction of the first shell according to an embodiment of the present disclosure;

[0020] Figure 3 Schematically shows a perspective view of a flame gun from a first perspective according to an embodiment of the present disclosure;

[0021] Figure 4 Schematically shows Figure 3 a stereoscopic image of the flame gun from a second viewing angle;

[0022] Figure 5 Schematically shows Figure 3 a cross-sectional view of the flame gun;

[0023] Figure 6 Schematically shows a perspective view of a second housing at a second viewing angle according to an embodiment of the present disclosure;

[0024] Figure 7 A perspective view of a sealing plate according to an embodiment of the present disclosure is schematically shown.

[0025] In the drawings, the meanings of the reference numerals are as follows:

[0026] 1. A first shell;

[0027] 11. Discharge hole;

[0028] 12. Fuel hole;

[0029] 121, first end;

[0030] 122, second end;

[0031] 13. Cold mass entrance;

[0032] 14. Cold mass outlet;

[0033] 15. Cold mass channel;

[0034] 16. First sealing groove;

[0035] 17. First mounting hole;

[0036] 2. Second shell;

[0037] 21. Feeding interface;

[0038] 22. Fuel interface;

[0039] 23. Fuel chamber;

[0040] 24. Nose;

[0041] 25. Second sealing groove;

[0042] 26. The third sealing groove;

[0043] 27. Second mounting hole;

[0044] 3. Sealing plate;

[0045] 4. The first sealing member;

[0046] 5. A second sealing member; and

[0047] 6. Tighten the bolts. DETAILED DESCRIPTION

[0048] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present disclosure. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present disclosure. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present disclosure.

[0049] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The terms "include", "comprising", etc. used herein indicate the existence of the features, steps, operations and / or mechanisms, but do not exclude the existence or addition of one or more other features, steps, operations or mechanisms.

[0050] All terms (including technical and scientific terms) used herein have the meanings commonly understood by those skilled in the art unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0051] When using expressions such as "at least one of A, B, and C, etc.", they should generally be interpreted according to the meaning of the expression commonly understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0052] Figure 1 Schematically shows a perspective view of a first housing at a first viewing angle according to an embodiment of the present disclosure; Figure 2 A schematic diagram of the orthographic projection of the fuel hole and the discharge hole in the thickness direction of the first shell according to an embodiment of the present disclosure is schematically shown.

[0053] The embodiments of the present disclosure provide, Figure 1 and Figure 2As shown, the flame gun includes a first shell 1, a discharge hole 11 is coaxially arranged in the middle of the first shell 1, which is suitable for outputting a mixture of an oxidant and a raw material powder. A plurality of fuel holes 12 are also arranged in the first shell 1, and the plurality of fuel holes 12 are evenly spaced around the discharge hole 11. The fuel holes 12 are inclined to the axis of the discharge hole 11, and each fuel hole 12 has the same inclination direction; wherein each fuel hole 12 includes a first end 121 for inputting fuel and a second end 122 for outputting fuel, and in the orthographic projection in the thickness direction of the first shell 1, the projection of the second end 122 is located between the projection of the first end 121 and the projection of the discharge hole 11, and the midpoint of the projection of the second end 122 is not colinear with the midpoint of the projection of the first end 121 and the projection of the discharge hole 11.

[0054] According to the above-mentioned arrangement, by coaxially arranging the discharge hole 11 in the middle of the first shell 1, and arranging a plurality of fuel holes 12 inclined to the axis of the discharge hole 11 at even intervals in the circumferential direction thereof, the mixture of the oxidant and the raw material powder is accurately mixed with the fuel. By designing the inclination direction of the fuel hole, the input end 121 and the output end 122 of the fuel are not colinear with the orthographic projection of the discharge hole 11 in the thickness direction, and the projection of the output end 122 is located between the input end 121 and the projection of the discharge hole 11. Such an inclined design enables the output fuel to form a converged vortex, which can be fully mixed with the oxidant, significantly improving the combustion efficiency, and prolonging the residence time of the raw material powder in the flame, thereby increasing the heat conversion efficiency and reducing energy consumption. At the same time, this efficient mixing and heating process ensures the uniform melting and spheroidization of the raw material powder at high temperature, significantly improving the preparation quality and production efficiency of spherical powder particles.

[0055] It should be noted that the first connecting line of the midpoints of the input end 121 and the output end 122 of each fuel hole 12 in the orthographic projection in the thickness direction is located on the same side of the second connecting line of the midpoints of the input end 121 and the discharge hole 11 in the orthographic projection, and the angles between the first connecting line and the second connecting line are the same, so that each fuel hole 12 has the same inclination direction, forming a twisted structure that gradually converges and is tilted from the side where the input end 121 of the first shell 1 is located to the side where the output end 122 is located, so that the sprayed fuel forms a swirl.

[0056] Figure 3 Schematically shows a perspective view of a flame gun from a first perspective according to an embodiment of the present disclosure; Figure 4 Schematically shows Figure 3 a stereoscopic image of the flame gun from a second viewing angle; Figure 5 Schematically shows Figure 3 A cross-sectional view of the flame gun.

[0057] In an illustrative embodiment, Figures 3 to 5As shown, it also includes a second shell 2, which is arranged on the first surface of the first shell 1 and is suitable for connecting the input end of the discharge hole 11 with an external material source; and the second shell 2 is also suitable for connecting the first end 121 of the fuel hole 12 with an external fuel source.

[0058] According to the above-mentioned configuration, the second shell 2 is connected to an external material source and a fuel source so as to input a mixture of the oxidant and the raw material powder into the discharge hole 11 and input the fuel into the fuel hole 12 .

[0059] In an illustrative embodiment, Figures 3 to 5 As shown, a feed interface 21 is provided in the middle of the second shell 2 , and the feed interface 21 connects the material source and the discharge hole 11 to input the mixture of the oxidant and the raw material powder into the discharge hole 11 .

[0060] In detail, the feed interface 21 is coaxially arranged with the second shell 2 , and the second shell 2 is coaxially covered on the first surface of the first shell 1 , so that the axes of the feed interface 21 and the discharge hole 11 coincide with and are connected.

[0061] In an illustrative embodiment, Figures 3 to 5 As shown, the second housing 2 is further provided with a fuel interface 22 , which connects the fuel source and the fuel hole 12 so as to input the fuel into the fuel hole 12 .

[0062] In detail, the oxidant includes air and / or oxygen; the raw material powder includes silicon dioxide powder; the fuel includes hydrogen, natural gas, kerosene and diesel, among which the high temperature generated by the combustion of hydrogen can promote the melting and spheroidization of silicon micropowder, and the combustion product is only water vapor, which will not pollute the silicon micropowder; the main component of natural gas is methane (CH4), which can also provide sufficient heat when burned, but its combustion temperature is slightly lower than that of hydrogen; in some processes, kerosene can be used as fuel to provide the required heat through atomization and then combustion; diesel is similar to kerosene, and diesel can also be used as fuel, especially in situations where a higher combustion temperature is required.

[0063] Figure 6 A perspective view of a second housing at a second viewing angle according to an embodiment of the present disclosure is schematically shown.

[0064] In an illustrative embodiment, Figures 3 to 6 As shown, a plurality of fuel interfaces 22 are provided in the second housing 2 ; the second housing 2 is also provided with a fuel cavity 23 , which is configured in an annular shape to connect the plurality of fuel interfaces 22 and at least two fuel holes 12 .

[0065] According to the above-mentioned setting method, through the setting of the annular fuel chamber 23, the fuel from multiple fuel interfaces 22 converges in the fuel chamber 23 and is evenly distributed to each fuel hole 12 for output, thereby ensuring that the fuel has the same pressure in each fuel hole 12 for uniform flow, improving the stability and efficiency of combustion, and helping to improve the thermal efficiency of the flame gun in the process of preparing spherical powder particles, ensuring the uniform melting and spheroidization of the raw material powder at high temperature, thereby improving the preparation quality and production efficiency of spherical powder particles.

[0066] In detail, the plurality of fuel interfaces 22 are evenly spaced around the feed interface 21 , and the annular fuel cavity 23 is coaxially arranged with the feed interface 21 to ensure the communication between the plurality of fuel interfaces 22 and the plurality of fuel holes 12 .

[0067] In an illustrative embodiment, a second annular sealing groove 25 is provided on the second surface of the second shell 2 facing the first shell 1. The second sealing groove 25 is provided between the fuel chamber 23 and the output end of the feed interface 21, and is suitable for installing the first sealing member 4 to seal the inner side of the fuel chamber 23 and the feed interface 21.

[0068] In an illustrative embodiment, an annular third sealing groove 26 is further provided on the second surface. The third sealing groove 26 is provided on the outer side of the fuel cavity 23 and is suitable for installing the second sealing member 5 to seal the outer side of the fuel cavity 23 .

[0069] In an illustrative embodiment, the second sealing groove 25 and the third sealing groove 26 are coaxially arranged with the fuel cavity 23 .

[0070] In an illustrative embodiment, the first sealing member 4 and the second sealing member 5 include sealing rings or sealing gaskets.

[0071] In an illustrative embodiment, the diameter of the discharge hole 11 and the diameter of the fuel hole 12 are set according to a preset ratio, so that the speed of the oxidant and raw material powder output from the discharge hole 11 is 10 times the speed of the fuel output from the fuel hole 12, and the central gas flow rate is much greater than the flow rate of the surrounding gas. Due to the fluid pressure, the fuel sprayed from the outside will move closer to the center, fully mix with the oxidant and fuel, significantly increase the temperature of the flame spray, improve the heat transfer efficiency, and promote the sphericalization of the raw material powder.

[0072] In detail, in Example 1, natural gas is selected as fuel, the flow rate of natural gas is set to 20L / min, the number of fuel holes is set to 16, the fuel output speed is 4m / s, and the raw material powder needs to be sprayed out according to the maximum temperature reached in the natural gas and air combustion experiment and the speed of the oxidant. The oxidant flow rate is set to 72L / min, and the oxidant output speed is about 40m / s. At this time, the diameter of each fuel hole 12 is calculated to be 2.6mm, and the diameter of the discharge hole 11 is 6.2; in this way, the flow rate and speed take into account the injection effect of the raw material powder, the temperature of gas combustion, and promoting the fuel to move closer to the center.

[0073] In an illustrative embodiment, Figure 1 As shown, a cold mass inlet 13 and a cold mass outlet 14 connected to an external cold mass source are provided in the first shell 1; a cold mass channel 15 connected to the cold mass inlet 13 and the cold mass outlet 14 is also provided in the first shell 1, and the cold mass channel 15 is suitable for dissipating heat from the first shell 1 by utilizing the cold mass flowing through.

[0074] According to the above arrangement, a cold mass inlet 13, a cold mass outlet 14 and a cold mass channel 15 are provided, and a cooling medium provided by an external cold mass source flows through the cold mass channel 15, thereby taking away the heat generated by the first shell 1 during high-temperature operation. This prevents deformation or damage of the shell due to high temperature, and improves the durability and reliability of the flame gun.

[0075] In an illustrative embodiment, Figure 1 As shown, the cold mass inlet 13 and the cold mass outlet 14 are arranged at intervals on the side wall of the first shell 1 and extend in the radial direction of the first shell 1 respectively.

[0076] According to the above arrangement, the cold mass inlet 13 and the cold mass outlet 14 are arranged at intervals on the side wall of the first shell 1. This layout facilitates the installation of the second shell and ensures that the connected cold mass source and related components are not affected by the high temperature generated by the combustion of fuel. The structure is optimized, the complexity is reduced, and the thermal isolation performance of the flame gun is improved, thereby ensuring the stable operation and long-term durability of the flame gun in a high temperature environment.

[0077] In an illustrative embodiment, the cold mass inlet 13 and the cold mass outlet 14 are provided with threads, which are suitable for connecting to a pagoda adapter and connecting to a cold mass pipe to allow cooling water to flow in.

[0078] In an exemplary embodiment, the cold mass channel 15 is configured to extend reciprocatingly around the plurality of fuel holes 12 .

[0079] In an exemplary embodiment, the cold mass channel 15 is configured in an “S” shape and connected between the cold mass inlet 13 and the cold mass outlet 14 , and is evenly distributed in the circumferential direction of the plurality of fuel holes 12 .

[0080] According to the above-mentioned setting method, the flow path length of the cold mass in the cold mass channel 15 and the coverage area of ​​the cooling channel 15 are increased, which helps to achieve a more uniform heat dissipation effect and reduce the temperature gradient inside the flame gun, thereby improving the stability and repeatability of the spherical silicon micropowder preparation process, extending the service life of the flame gun, reducing maintenance costs and downtime, optimizing the temperature distribution around the fuel hole, and helping to improve the quality and output of the spherical silicon micropowder.

[0081] In an illustrative embodiment, Figure 1 and Figure 5 As shown, the cold mass channel 15 includes an arcuate groove formed on the first surface, and the arcuate groove extends around the plurality of fuel holes 12 .

[0082] According to the above-mentioned setting mode, the cold mass channel 15 adopts an arc-shaped groove design extending on the first surface, which cleverly promotes the direct contact between the cold mass flowing inside and the second shell 2, and effectively dissipates the heat of the second shell 2 heated by the heat conduction of the first shell 1. At the same time, the arc-shaped groove design on the surface not only simplifies the structure of the cold mass channel 15 and reduces the manufacturing cost, but also improves the visibility and maintenance convenience of the cold mass channel 15, ensuring the long-term stable operation of the cooling system and the efficient heat dissipation performance of the equipment.

[0083] Figure 7 A perspective view of a sealing plate according to an embodiment of the present disclosure is schematically shown.

[0084] In an illustrative embodiment, Figure 1 , Figure 5 and Figure 7 As shown, it also includes a sealing plate 3, which is constructed in an annular shape and is installed in a sealing groove 16 formed on the first surface. The sealing plate 3 is suitable for sealing the arc-shaped groove.

[0085] According to the above arrangement, by installing the annular sealing plate 3 in the sealing groove 16 on the first surface, the arc-shaped channel is effectively sealed, thereby ensuring the integrity of the cold mass channel 15. The sealing performance of the cooling system is improved, the leakage of the cooling medium is prevented, and the stability and safety of the equipment in a high-temperature working environment are guaranteed, thereby improving the operating efficiency and reliability of the entire system.

[0086] In an illustrative embodiment, Figure 1 , Figure 3 and Figure 6 As shown, a flange 24 extending in the radial direction of the second shell 2 is provided on the circumference of the second shell 2 , and the flange 24 is suitable for connecting with the first shell 1 and fixing the sealing plate 3 in the sealing groove 16 .

[0087] According to the above arrangement, the flange 24 is suitable for connecting the first housing 1, providing a mechanical interface for fixing the first housing 1 and the second housing 2, and ensuring the integrity and stability of the flame gun structure. The flange 24 is also used to fix the sealing plate 3 in the sealing groove 16, which helps to ensure that the sealing plate 3 maintains good sealing performance under high temperature and pressure environment to prevent leakage of the cooling medium.

[0088] In detail, the flange 24 is provided in the circumferential direction of the end surface of the second housing 2 facing the first housing 1 .

[0089] In an illustrative embodiment, Figures 3 to 5 As shown, the flange 24 is connected to the first housing 1 via fastening bolts 6 .

[0090] In detail, the flange 24 is provided with a plurality of first mounting holes 17 evenly spaced around the second shell 2, and the first shell is provided with second mounting holes 27 matching the plurality of first mounting holes 17, which are suitable for installing fastening bolts 6 to connect and fix the flange 24 and the first shell 1.

[0091] It will be appreciated by those skilled in the art that the features described in the various embodiments of the present disclosure may be combined and / or combined in a variety of ways, even if such combinations or combinations are not explicitly described in the present disclosure. In particular, without departing from the spirit and teachings of the present disclosure, the features described in the various embodiments of the present disclosure may be combined and / or combined in a variety of ways. All of these combinations and / or combinations fall within the scope of the present disclosure.

[0092] The embodiments of the present disclosure are described above. However, these embodiments are only for illustrative purposes and are not intended to limit the scope of the present disclosure. Although the embodiments are described above, this does not mean that the measures in the various embodiments cannot be used in combination to advantage. Without departing from the scope of the present disclosure, those skilled in the art may make a variety of substitutions and modifications, which should all fall within the scope of the present disclosure.

Claims

1. A flame gun for preparing spherical powder particles, characterized in that: The invention comprises a first shell (1), wherein a discharge hole (11) is coaxially arranged in the middle of the first shell (1), and is suitable for discharging a mixture of an oxidant and raw material powder; a plurality of fuel holes (12) are also arranged in the first shell (1), and the plurality of fuel holes (12) are evenly spaced in the circumferential direction of the discharge hole (11); the fuel holes (12) are inclined to the axis of the discharge hole (11), and each of the fuel holes (12) has the same inclination direction; Each of the fuel holes (12) comprises a first end (121) for inputting fuel and a second end (122) for outputting fuel, and in an orthographic projection in the thickness direction of the first shell (1), the projection of the second end (122) is located between the projection of the first end (121) and the projection of the discharge hole (11), and the midpoint of the projection of the second end (122) is not collinear with the midpoint of the projection of the first end (121) and the discharge hole (11).

2. The flame gun according to claim 1, characterized in that: It also comprises a second shell (2), the second shell (2) being arranged on the first surface of the first shell (1) and being suitable for connecting the input end of the discharge hole (11) with an external material source; Furthermore, the second shell (2) is also suitable for connecting the first end (121) of the fuel hole (12) to an external fuel source.

3. The flame gun according to claim 2, characterized in that: A material feed interface (21) is provided in the middle of the second shell (2), and the material feed interface (21) connects the material source and the material discharge hole (11).

4. The flame gun according to claim 3, characterized in that: The second shell (2) is also provided with a fuel interface (22), and the fuel interface (22) connects the fuel source and the fuel hole (12).

5. The flame gun according to claim 4, characterized in that: A plurality of fuel interfaces (22) are arranged in the second shell (2); The second shell (2) is also provided with a fuel cavity (23), and the fuel cavity (23) is configured in an annular shape so as to connect the plurality of fuel interfaces (22) and to connect with at least two of the fuel holes (12).

6. The flame gun according to claim 2, characterized in that: The first shell (1) is provided with a cold mass inlet (13) and a cold mass outlet (14) which are connected to an external cold mass source; A cold mass channel (15) connecting the cold mass inlet (13) and the cold mass outlet (14) is also provided in the first shell (1), and the cold mass channel (15) is suitable for dissipating heat from the first shell (1) by utilizing the cold mass flowing through the channel.

7. The flame gun according to claim 6, characterized in that: The cold mass inlet (13) and the cold mass outlet (14) are arranged at intervals on the side wall of the first shell (1), and extend in the radial direction of the first shell (1) respectively.

8. The flame gun according to claim 6, characterized in that: The cold mass channel (15) comprises an arcuate groove formed on the first surface, and the arcuate groove extends around the plurality of fuel holes (12).

9. The flame gun according to claim 8, characterized in that: It also comprises a sealing plate (3), which is constructed in an annular shape and is installed in a sealing groove (16) formed on the first surface, and the sealing plate (3) is suitable for sealing the arc-shaped groove.

10. The flame gun according to claim 9, characterized in that: The second shell (2) is provided with a flange (24) extending in the radial direction of the second shell (2) on the circumference thereof, and the flange (24) is suitable for connecting to the first shell (1) and fixing the sealing plate (3) in the sealing groove (16).

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