A detonation spray device

Abstract

The present application relates to the technical field of detonation spraying, and particularly relates to a detonation spraying device, which comprises a spray gun body, one end of the spray gun body is provided with a fuel supply inlet, a plurality of spraying powder supply inlets are arranged on the side wall of the spray gun body, and the spraying powder supply inlets are arranged at intervals along the circumference of the spray gun body; a spraying powder supply assembly is arranged outside the spray gun body, and the spraying powder supply inlets are in communication with the spraying powder supply assembly; a fluid nozzle is connected to the outlet end of the spray gun body, a jet supply assembly is arranged on the fluid nozzle, and the jet supply assembly is in communication with the fluid nozzle. During the operation of the detonation spraying device, the detonation wave is formed by the action of the burned fuel gas, the spraying powder and the carrier gas in the spray gun body, the traditional detonation barrier is not needed, the accumulation and blockage of the powder in the spray gun body can be effectively prevented, the kinetic energy loss in the flow process of the detonation wave is reduced, the flying speed of the output fluid of the detonation spraying device can be ensured, and the coating quality is improved.

Description

Technical Field

[0001] This invention relates to the field of detonation spraying technology, and more specifically to a detonation spraying device. Background Technology

[0002] Detonation spraying is a thermal spraying technology that evolved from detonation combustion. The process involves premixing fuel and oxidizer and feeding them into a sealed circular tube that is closed at one end and open at the other. An igniter ignites the fresh mixture, and the slow combustion gradually evolves into detonation combustion, generating detonation waves and high-temperature, high-pressure gas. This causes the spray powder to heat up, accelerate, and bombard the surface of the workpiece at high speed to form a coating.

[0003] In existing technologies, the most common initiation method for detonation combustion is to first ignite the gas mixture with low ignition energy to generate a slow-burning wave, and then generate a detonation wave through a transition from slow-burning to detonation. Since the process of generating the detonation wave requires a long path, the detonation transition section needs to be designed with a long dimension to allow the slow-burning wave to naturally transition into the detonation wave. This results in the axial dimension of the detonation spraying device typically exceeding one meter, increasing operating costs and reducing practicality. To shorten the path required to generate the detonation wave, obstacles such as spirals and perforated plates are usually used to accelerate the detonation transition process, thereby shortening the initiation time and distance. However, adding obstacles inside the pipeline causes a significant loss of kinetic energy in the powder as it passes through the obstacles, and may even cause powder blockage within the pipeline, affecting the flight speed of the output fluid of the detonation spraying device and impacting coating quality. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the detonation-enhancing obstacles set up by the existing detonation spraying device to generate the required path length of the detonation wave will cause a large loss of powder kinetic energy, thereby providing a detonation spraying device.

[0005] To solve the above-mentioned technical problems, the present invention provides a detonation spraying device, comprising:

[0006] The spray gun body has a fuel supply inlet at one end and multiple powder supply inlets on the side wall of the spray gun body. The multiple powder supply inlets are spaced apart along the circumference of the spray gun body.

[0007] The powder supply assembly is fitted on the outside of the spray gun body, and multiple powder supply inlets are connected to the powder supply assembly.

[0008] A fluid nozzle is connected to the outlet end of the spray gun body. A jet supply component is installed on the fluid nozzle and is connected to the fluid nozzle.

[0009] Optionally, the powder supply inlet is provided at multiple stages along the axial direction of the spray gun body, and each stage of the powder supply inlet is provided with a set of powder supply components.

[0010] Optionally, the powder coating supply assembly includes:

[0011] The supply ring pipe is sleeved on the outside of the spray gun body, and the supply ring pipe is connected to the powder supply inlet through a connecting pipe.

[0012] The supply inlet pipe is connected to the supply ring pipe, and the supply inlet pipe and the supply ring pipe are tangentially connected.

[0013] Optionally, the jet supply assembly includes a jet ring pipe sleeved and installed on the fluid nozzle and a jet inlet pipe communicating with the jet ring pipe, wherein the jet ring pipe is communicating with the fluid nozzle and the jet inlet pipe is tangent to the jet ring pipe.

[0014] Optionally, the jet annular pipe and the fluid nozzle are connected through a jet annular gap.

[0015] Optionally, the jet supply assembly includes:

[0016] A jet ring is installed on the fluid nozzle and is connected to the fluid nozzle.

[0017] The secondary flow delivery pipeline is connected at one end to the jet ring pipe and at the other end to the inner cavity of the spray gun body. The connection port between the secondary flow delivery pipeline and the spray gun body is located between the fuel supply inlet and the spray powder supply inlet.

[0018] Optionally, multiple secondary flow delivery pipelines are provided at circumferential intervals along the spray gun body.

[0019] Optionally, the fluid nozzle includes two conical sections connected at the smaller inner diameter ends.

[0020] Optionally, the jet supply component is connected at the junction of the two conical sections.

[0021] Optionally, an igniter mounting bracket is provided on the spray gun body between the fuel supply inlet and the powder supply inlet.

[0022] The technical solution of this invention has the following advantages:

[0023] 1. The detonation spraying device provided by the present invention includes: a spray gun body, one end of which is provided with a fuel supply inlet, and a plurality of spray powder supply inlets are provided on the side wall of the spray gun body, the plurality of spray powder supply inlets being spaced apart along the circumference of the spray gun body; a spray powder supply assembly, sleeved on the outside of the spray gun body, the plurality of spray powder supply inlets being connected to the spray powder supply assembly; and a fluid nozzle, connected to the outlet end of the spray gun body, a jet supply assembly being installed on the fluid nozzle, the jet supply assembly being connected to the fluid nozzle.

[0024] During operation, the detonation spraying device introduces fuel gas into the spray gun body through the fuel supply inlet. Upon entering the spray gun body, the fuel gas is ignited. Simultaneously, the coating powder and carrier gas are injected circumferentially into the spray gun body through the coating powder supply inlet. The coating powder and carrier gas injected axially form a fluid-structure interaction barrier within the spray gun body, creating a detonation transition section. The direction of movement of the fuel gas is perpendicular to the direction of movement of the coating powder. When they meet, the burning fuel gas heats the coating powder to a molten state and simultaneously redirects the powder to move axially along the spray gun body. This generates turbulence upon contact between the fuel gas and the coating powder, forming a detonation wave. Finally, at the fluid nozzle at the end of the spray gun body, jet gas is introduced from the jet supply assembly into the fluid nozzle, indirectly reducing the flow area and further accelerating the coating powder, ultimately spraying it onto the surface of the workpiece to form a coating. During operation, the detonation spraying device utilizes sprayed powder and carrier gas, which are injected circumferentially from the inner wall of the spray gun body towards its axis. The ignited fuel then impacts the powder vertically, generating turbulence to form a detonation wave. This ultimately heats and accelerates the powder, which is then delivered to the surface of the workpiece to form a coating. The detonation wave is generated within the spray gun body through the interaction of fuel gas and powder, eliminating the need for traditional detonation enhancement barriers. This effectively prevents powder accumulation and blockage within the spray gun body, reduces kinetic energy loss during the detonation wave flow, ensures the flight speed of the output fluid from the detonation spraying device, and improves coating quality.

[0025] 2. The detonation spraying device provided by the present invention sets the spray powder supply inlet to be multi-stage along the axial direction. The spray powder at the multi-stage spray powder supply inlet is uniformly sprayed into the spray gun body from multiple directions, which increases the turbulence of the flow field inside the spray gun body and enhances the detonation-aiding effect of the detonation transition stage.

[0026] 3. The detonation spraying device provided by the present invention sets the spraying powder supply component as a supply ring pipe and a supply inlet pipe, and makes the supply inlet pipe tangent to the supply ring pipe. This allows the spraying powder, driven by the carrier gas, to enter the supply ring pipe from the supply inlet pipe and move smoothly along the annular pipe of the supply ring pipe. It then passes through the connecting pipe and is sprayed into the spray gun body from the spraying powder supply inlet. This reduces the kinetic energy loss of the spraying powder during its entry into the spray gun body, increases the turbulence of the flow formed when the fuel gas inside the spray gun body meets the spraying powder, and enhances the detonation-aiding effect of the detonation transition stage.

[0027] 4. The detonation spraying device provided by this invention connects the jet annular pipe and the fluid nozzle through a jet annular slit. After the jet gas enters the fluid nozzle, it can affect the flow direction of the mainstream, thereby changing the effective flow area ratio of the mainstream, increasing the powder flight speed, and thus improving the coating quality. Compared with traditional nozzles, the fluid nozzle does not suffer from powder clogging, making it more practical.

[0028] 5. The detonation spraying device provided by this invention utilizes a secondary flow delivery pipeline to connect the fuel inlet of the spray gun body to the jet ring pipe, drawing combustion gas from the spray gun body and sending it into the jet ring pipe. Employing a valveless adaptive fluid nozzle eliminates the need for an external tangential pipeline to supply the required gas to the fluid nozzle. Instead, during detonation combustion, it utilizes the principle of high-pressure combustion gas flowing to a low-pressure region, extracting a portion of the combusted gas as a secondary jet through the secondary flow delivery pipeline. This secondary jet is then delivered to the jet ring pipe. When the secondary jet is injected into the main flow, it influences the flow direction of the main flow, thereby changing the effective flow area ratio of the main flow and increasing the powder flight velocity, thus improving the coating quality.

[0029] 6. The detonation spraying device provided by the present invention has multiple secondary flow delivery pipelines arranged at intervals along the circumference of the spray gun body to improve the uniformity of the secondary flow entering the jet ring pipe, thereby improving the uniformity of the fluid output by the detonation spraying device and improving the coating quality. Attached Figure Description

[0030] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is an isometric view of the detonation spraying device provided in an embodiment of the present invention.

[0032] Figure 2 for Figure 1 The right view of the detonation spraying device shown.

[0033] Figure 3 for Figure 2 A sectional view along the A-A direction.

[0034] Figure 4 This is an isometric view of a detonation spraying device provided in another embodiment of the present invention.

[0035] Explanation of reference numerals in the attached drawings: 1. Spray gun body; 2. Fuel supply pipeline; 3. Ignition device mounting base; 4. Supply ring pipe; 5. Connecting pipe; 6. Powder supply inlet; 7. Jet ring pipe; 8. Jet ring gap; 9. Contraction section; 10. Expansion section; 11. Secondary flow inlet pipeline; 12. Secondary flow delivery pipeline; 13. Secondary flow outlet pipeline. Detailed Implementation

[0036] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0040] Figures 1 to 3 The present embodiment shows a detonation spraying device, including: a spray gun body 1, a spray powder supply assembly and a fluid nozzle.

[0041] A fuel supply inlet is provided at one end of the spray gun body 1, and multiple powder supply inlets 6 are provided on the side wall of the spray gun body 1, spaced apart circumferentially. A powder supply assembly is fitted onto the outside of the spray gun body 1, and all the powder supply inlets 6 are connected to the powder supply assembly. A fluid nozzle is connected to the outlet end of the spray gun body 1, and a jet supply assembly is installed on the fluid nozzle, which is connected to the fluid nozzle. To facilitate the ignition of fuel gas within the spray gun body 1, an igniter mounting seat 3 is provided on the spray gun body 1 between the fuel supply inlet and the powder supply inlets 6. One end of the spray gun body 1 is closed, and the other end is open. A fuel supply pipe 2 is provided at the fuel supply inlet at the closed end to provide fresh premixed fuel required for detonation combustion. An igniter mounting seat 3 is also provided near the closed end for inserting and fixing an igniter, which is used to ignite the fresh mixture.

[0042] The powder supply assembly includes a supply ring pipe 4 and a supply inlet pipe. The supply ring pipe 4 is sleeved on the outside of the spray gun body 1, and the supply ring pipe 4 is connected to the powder supply inlet 6 via a connecting pipe 5. The supply inlet pipe is connected to the supply ring pipe 4 and is tangentially arranged with the supply ring pipe 4. A powder supply assembly is located in the upper middle part of the spray gun body 1. The powder supply assembly mainly includes a supply ring pipe 4 and a supply inlet pipe. The supply ring pipe 4 is coaxially arranged on the outer periphery of the spray gun body 1, and it is connected to the spray gun body 1 via several connecting pipes 5 and the powder supply inlet 6. The carrier gas and powder ejected from all the powder supply inlets 6 between the two ends of the powder supply assembly constitute a fluid-structure interaction barrier, forming a detonation transition section.

[0043] In this embodiment, multiple stages of powder supply inlets 6 are arranged at intervals along the axial direction of the spray gun body 1, and each stage of powder supply inlets 6 corresponds to a set of powder supply components. The supply ring pipes 4 in each stage of the powder supply component are connected to the spray gun body 1 through the same number of connecting pipes 5 and powder supply inlets 6. The spacing between powder supply inlets 6 in adjacent stages is 1-4 times the orifice diameter of the powder supply inlet 6, and the distance between the supply ring pipes 4 at both ends is 10 times the inner diameter of the spray gun body 1. The number of powder supply inlets 6 in each stage is 2-12, and multiple powder supply inlets 6 in the same stage are evenly arranged at equal angles along the circumference. In different stages, the powder supply inlets 6 are offset sequentially along the circumference from the first end to the last end at the same angle. The offset angle is 0-30 degrees. The specific angle is determined by the number of stages of the supply ring pipe 4 and the number of powder supply inlets 6 in each stage, so as to ensure that the carrier gas and powder jet can be uniformly sprayed into the spray gun body 1 from multiple directions, improve the turbulence of the flow field, and help improve the detonation effect of the detonation transition stage.

[0044] like Figure 1 and Figure 3 As shown, the supply ring pipe 4 is arranged in five stages at equal intervals along the axial direction of the spray gun body 1. Each stage is connected to the spray gun body 1 through four connecting pipes 5 and four powder supply inlets 6. The powder supply inlets 6 in each stage are evenly arranged at 90-degree intervals along the circumference. In different stages, the powder supply inlets 6 from the first end to the last end are offset at an angle of 18 degrees along the circumference. The carrier gas and powder ejected from all the powder supply inlets 6 between the first and fifth stages of the supply ring pipe 4 constitute a fluid-structure interaction obstacle, forming a detonation transition section.

[0045] The carrier gas and powder jets are uniformly injected into the nozzle body 1 from multiple directions, forming a fluid-structure interaction barrier in the path of flame propagation to fresh fuel. Compared with traditional detonation enhancement devices, this effectively prevents powder blockage and reduces flow loss. In addition, the powder volume in the fluid-structure interaction barrier is very small, and several tiny powder particles can interact with the flame and burned gas to form disturbances, further increasing the turbulence of the flow field and enhancing the detonation transition process. Compared with a single fluid barrier, the detonation performance is superior.

[0046] The flow rate in the multi-stage supply ring pipe 4 can be adjusted individually, facilitating the adjustment of the flow field turbulence and the flow distribution within the spray gun body 1. This allows for adjustment of the detonation characteristics of the detonation transition section, improving the device's practicality. The detonation spraying device provided in this embodiment is based on the phenomenon of high turbulence and intense heat transfer in the detonation transition section of the detonation combustion chamber. Powder is injected into the detonation transition section in stages, allowing the powder to participate in the entire process of transition from slow combustion to detonation combustion. The powder fully contacts and mixes with the high-temperature combustion gas and detonation wave, absorbing more heat and increasing the upper temperature limit. This allows the high-melting-point powder to reach a molten state even when using other safer fuels. This overcomes the shortcomings of existing technologies where detonation combustion can only use acetylene as fuel, and the inability to generate a high-temperature environment to melt the powder when using safer fuels.

[0047] The jet supply assembly includes a jet annular tube 7 sleeved and installed on a fluid nozzle and a jet inlet pipe communicating with the jet annular tube 7. The jet annular tube 7 is connected to the fluid nozzle, and the jet inlet pipe is tangent to the jet annular tube 7. The jet annular tube 7 and the fluid nozzle are connected through a jet annular slot 8.

[0048] The spray gun body 1 has a fluid nozzle at its end, which includes two conical sections connected at the smaller inner diameter ends. A jet supply assembly is connected at the junction of the two conical sections. Figure 3As shown in the figure, the conical section on the left is the contraction section 9, and the conical section on the right is the expansion section 10. The contraction section 9 and the expansion section 10 are sequentially connected to the outlet of the spray gun body 1. The jet annular slit 8 is located at the throat position where the contraction section 9 and the expansion section 10 connect. The jet annular tube 7 is coaxially disposed on the outer periphery of the fluid nozzle and is connected and fixed to the fluid nozzle. The jet annular tube 7 is adapted to supply gas to the fluid nozzle through the jet annular slit 8. In this embodiment, the contraction angle and expansion angle of the contraction section 9 and the expansion section 10 are both 5-15 degrees, and the size of the jet annular slit 8 is 1-5 mm. Using a fluid nozzle allows for adjustment of the effective flow area of ​​the nozzle, significantly increasing the powder flight speed and thus improving the coating quality. Furthermore, compared to traditional nozzles, the fluid nozzle does not experience powder clogging, making it more practical.

[0049] During operation, fresh fuel is supplied to the spray gun body 1 via fuel supply pipe 2. Carrier gas carrying powder is supplied to the five-stage supply ring pipe 4 via a tangential supply inlet pipe. Each stage of the supply ring pipe 4 then distributes the carrier gas and powder to four connecting pipes 5, and finally sprays them into the spray gun body 1 through four powder supply inlets 6. The igniter ignites the fresh mixture, and the initial stage of combustion is slow combustion. The flame propagates downstream from the igniter to the spray gun body 1. When it reaches the detonation transition section, the presence of multiple stages of uniformly ejected carrier gas and powder jets from various directions significantly increases the turbulence of the flow field. This causes the flame to continuously change its propagation direction, accelerating the transition from slow combustion to detonation combustion. Ultimately, a detonation wave is formed and continues to propagate downstream of the spray gun body 1. During this process, the carrier gas and powder act as fluid-structure interaction barriers, increasing the probability of collision between the flame and the surrounding environment, increasing the disorder of the flame, and increasing the flame turbulence, thereby accelerating the transition from slow combustion to detonation combustion. Compared to traditional detonation enhancement devices such as Shchelkin spirals, orifice plates, and baffles, the fluid-structure interaction barrier composed of carrier gas and powder can effectively prevent powder blockage and reduce flow loss. At the same time, the powder volume is very small, and several tiny powder particles can interact with the flame and burned gas to form disturbances, further increasing the turbulence of the flow field and the flame, thereby enhancing the detonation transition process. Compared to a single fluid barrier, the detonation performance is superior.

[0050] Furthermore, the detonation spraying device provided in this embodiment is based on the phenomenon that the detonation transition section in the detonation combustion chamber has high turbulence and the most intense heat exchange. It injects powder into the detonation transition section in stages, so that the powder participates in the entire process of transition from slow combustion to detonation combustion. It fully contacts and mixes with high-temperature gas and detonation waves, absorbs more heat, and increases the upper temperature limit. Thus, when using other safer fuels, it can make the high melting point powder reach the molten state.

[0051] During detonation combustion, the gas required by the fluid nozzle is supplied tangentially from an external gas source through the jet inlet pipe to the jet annular pipe 7, and then injected through the jet annular slot 8 into the throat region at the junction of the contraction section 9 and the expansion section 10. This affects the flow direction of the mainstream, thereby changing the effective flow area ratio of the mainstream, increasing the powder flight velocity, and thus improving the coating quality. Compared with traditional nozzles, the fluid nozzle does not experience powder clogging, making it more practical.

[0052] As an alternative implementation method, such as Figure 4 As shown, the jet supply assembly includes a jet ring pipe 7 and a secondary flow delivery pipe 12. The jet ring pipe 7 is mounted on the fluid nozzle and communicates with the fluid nozzle, with the jet ring pipe 7 and the fluid nozzle connected by a jet ring slit 8. One end of the secondary flow delivery pipe 12 communicates with the jet ring pipe 7, and the other end communicates with the inner cavity of the spray gun body 1. The connection port between the secondary flow delivery pipe 12 and the spray gun body 1 is located between the fuel supply inlet and the spray powder supply inlet 6. Multiple secondary flow delivery pipes 12 are arranged at intervals along the circumference of the spray gun body 1.

[0053] In this embodiment, a valveless adaptive fluid nozzle is used. This method eliminates the need for an external tangential pipeline to supply the gas required by the fluid nozzle. Instead, a secondary flow inlet pipe 11 is provided near the closed end of the nozzle body 1 to extract the combusted gas inside the nozzle body 1 as a secondary jet. This secondary flow is then transported to the secondary flow outlet pipe 13 via the secondary flow delivery pipe 12. The end of the secondary flow outlet pipe 13 is connected to the jet ring pipe 7, which is suitable for supplying the secondary flow to the jet ring pipe 7. Finally, the secondary flow is ejected through the jet ring slot 8. The secondary flow inlet pipe 11 and the secondary flow outlet pipe 13 are perpendicularly connected to the nozzle body 1, and the secondary flow delivery pipe 12 is arranged parallel to the axis of the nozzle body 1.

[0054] The secondary flow inlet pipe 11 is located upstream of the detonation transition section and the igniter, closer to the closed end of the spray gun body 1, to prevent powder from being mixed into the secondary flow. A valveless adaptive fluid nozzle is used to introduce the secondary flow into the jet annular slot 8, thus redistributing the detonation combustion products within the spray gun body 1. This method broadens the application range of the fluid nozzle and achieves phase matching between the main flow and the secondary flow. Furthermore, the valveless adaptive fluid nozzle eliminates the need for an external gas source, significantly reducing system complexity.

[0055] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A detonation spraying device, characterized in that, include: The spray gun body (1) has a fuel supply inlet at one end. Multiple powder supply inlets (6) are provided on the side wall of the spray gun body (1). The multiple powder supply inlets (6) are arranged at intervals along the circumference of the spray gun body (1). A powder supply assembly is fitted on the outside of the spray gun body (1), and multiple powder supply inlets (6) are connected to the powder supply assembly. A fluid nozzle is connected to the outlet end of the spray gun body (1), and a jet supply assembly is installed on the fluid nozzle, which is connected to the fluid nozzle.

2. The detonation spraying device according to claim 1, characterized in that, The powder supply inlet (6) is provided in multiple stages along the axial direction of the spray gun body (1), and each stage of the powder supply inlet (6) is provided with a set of powder supply components.

3. The detonation spraying device according to claim 2, characterized in that, The powder supply assembly includes: A supply ring pipe (4) is sleeved on the outside of the spray gun body (1), and the supply ring pipe (4) is connected to the spray powder supply inlet (6) through a connecting pipe (5). The supply inlet pipe is connected to the supply ring pipe (4), and the supply inlet pipe is tangential to the supply ring pipe (4).

4. The detonation spraying apparatus according to any one of claims 1 to 3, characterized in that, The jet supply assembly includes a jet ring pipe (7) sleeved and installed on the fluid nozzle and a jet inlet pipe communicating with the jet ring pipe (7). The jet ring pipe (7) is communicating with the fluid nozzle, and the jet inlet pipe is tangent to the jet ring pipe (7).

5. The detonation spraying device according to claim 4, characterized in that, The jet ring pipe (7) is connected to the fluid nozzle through the jet ring gap (8).

6. The detonation spraying apparatus according to any one of claims 1 to 3, characterized in that, The jet supply assembly includes: A jet ring tube (7) is installed on the fluid nozzle, and the jet ring tube (7) is connected to the fluid nozzle; The secondary flow delivery pipeline (12) is connected at one end to the jet ring pipe (7) and at the other end to the inner cavity of the spray gun body (1). The connection port between the secondary flow delivery pipeline (12) and the spray gun body (1) is located between the fuel supply inlet and the spray powder supply inlet (6).

7. The detonation spraying device according to claim 6, characterized in that, The secondary flow delivery pipeline (12) is provided in multiple circumferentially spaced along the spray gun body (1).

8. The detonation spraying apparatus according to any one of claims 1 to 3, characterized in that, The fluid nozzle includes two conical sections, which are connected at the smaller inner diameter ends.

9. The detonation spraying device according to claim 8, characterized in that, The jet supply component is connected at the junction of the two conical sections.

10. The detonation spraying apparatus according to any one of claims 1 to 3, characterized in that, An igniter mounting base (3) is provided on the spray gun body (1) between the fuel supply inlet and the powder supply inlet (6).

Images