Gas-liquid-solid three-phase jet spray gun

Abstract

The invention relates to a gas-liquid-solid three-phase jet flow spray gun, which comprises a high-pressure water joint, a needle-shaped linear liquid column flow high-pressure nozzle, a gas-water spray head core body, a spray head shell, a high-pressure gas elbow, a gas-water spray pipe, a spray gun body, a sand blasting pipe sheath, a sand blasting pipe and a high-pressure gas nozzle, a high-pressure air nozzle threaded hole is formed in one end of the bottom of the annular air cavity of the air-water sprayer core, the high-pressure air nozzle is in threaded connection in the high-pressure air nozzle threaded hole, and one end of the air-water spraying pipe is inserted into the end, away from the high-pressure nozzle, of the inner cavity of the air-water sprayer core. The gas-water spray head is arranged in the front, a gas-in-water conveying state is formed in the gas-water spray head, a high-speed jet gas-in-water two-phase jet flow accelerates abrasive materials entering the mixing chamber to form a high-pressure gas-carrying abrasive material and a three-phase mixed jet flow with high-pressure water in the center, and the three-phase mixed jet flow is jetted to the surface of a workpiece from a sand blasting pipe of the spray gun at a high speed. Dirt is stripped and hit, and the purpose of cleaning workpieces is achieved.

Description

Technical Field

[0001] This invention relates to the field of surface treatment technology equipment, and more particularly to a gas, liquid, and solid three-phase jet spray gun. Background Technology

[0002] Cleaning technology in surface treatment processes is an indispensable key link in industrial production. Its core task is to efficiently remove contaminants such as oil, rust, and residual paint from workpiece surfaces. With increasingly stringent environmental protection requirements and rising demands for material protection, traditional cleaning technologies are facing severe challenges. While water jet cleaning, as a current mainstream technology, has environmental advantages, it still has significant limitations in handling different types of dirt: for general oil stains, traditional organic cleaning agents are being phased out due to environmental pollution and processing costs; for stubborn dirt, traditional abrasives such as quartz sand and steel shot can easily damage the workpiece substrate, and subsequent waste disposal is difficult.

[0003] Cleaning technology based on sodium bicarbonate hydrocarbon abrasives has evolved into an advanced cleaning solution that combines high efficiency, environmental friendliness, and material protection. This technology is widely used in high-end fields such as aerospace, marine, petrochemical, energy, and cultural relic preservation. It can treat various materials including steel, aluminum, copper alloys, ceramics, and some plastics and rubbers, effectively removing surface dust, oil, paint, oxides, and carbon deposits. However, the water solubility of this abrasive (7.8 g / 100 mL at 18°C) presents a unique challenge to spraying technology: in conventional three-phase spray guns, premature contact of the abrasive with the water flow leads to dissolution failure, completely negating the physical cleaning effect of the abrasive impact. Existing spray gun technology suffers from the following key defects: 1. An unreasonable mixing chamber structure leads to premature contact between the abrasive and water; 2. Insufficient airflow delivery system efficiency fails to ensure effective delivery of dry abrasive; 3. Poor sealing performance causes the abrasive to become damp and clump during delivery. These problems severely restrict the widespread application of sodium bicarbonate abrasives in the domestic industrial cleaning field, necessitating a dedicated spray gun system. Summary of the Invention

[0004] This invention aims to address the shortcomings of existing technologies by providing a gas-liquid-solid three-phase jet spray gun. Through optimized gas path design, improved mixing chamber structure, and enhanced sealing performance, it ensures that sodium bicarbonate abrasive remains dry before reaching the workpiece surface, thus maximizing its physical impact. Simultaneously, it works in conjunction with subsequent water jets to achieve dust control and waste disposal.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A three-phase gas-liquid-solid jet spray gun includes a high-pressure water connector, a needle-shaped linear liquid jet high-pressure nozzle, a gas-water nozzle core, a nozzle housing, a high-pressure air elbow, a gas-water spray pipe, a spray gun body, a sandblasting pipe sheath, a sandblasting pipe, and a high-pressure air nozzle. The high-pressure water connector is threaded into one end of the gas-water nozzle core, pressing the needle-shaped linear liquid jet high-pressure nozzle into the central cavity of the gas-water nozzle core. An annular air chamber is provided in the middle of the outer periphery of the gas-water nozzle core. Six circumferentially distributed, axially extending high-pressure air nozzle threaded holes are opened at the bottom of the annular air chamber, opposite to the high-pressure nozzle. The high-pressure air nozzle is threaded into the high-pressure air nozzle. Inside the threaded hole of the nozzle, one end of the air-water nozzle is inserted into the inner cavity of the air-water nozzle core, at the end away from the high-pressure nozzle. The air-water nozzle core and one end of the air-water nozzle are fitted into the nozzle housing. The air-water nozzle core and the air-water nozzle are fastened together by screwing the nozzle cap onto the nozzle housing to form an air-water nozzle, or an air-in-water two-phase nozzle. An air inlet is provided on the nozzle housing, and a high-pressure air elbow is connected to the air inlet. The other end of the air-water nozzle is fitted into one end of the spray gun body. The other end of the spray gun body is internally threaded to a sandblasting pipe sleeve. A sandblasting pipe is fitted inside the sandblasting pipe sleeve. An abrasive inlet connector is connected to the abrasive inlet of the spray gun body.

[0007] A sealing gasket is provided at the contact end face between the high-pressure water connector and the needle-shaped linear liquid column high-pressure nozzle.

[0008] The outer wall of the needle-shaped linear liquid jet high-pressure nozzle is provided with a sealing ring groove, and an O-ring III is provided between the sealing ring groove of the needle-shaped linear liquid jet high-pressure nozzle and the contact surface of the inner wall of the air-water nozzle core; sealing ring grooves are provided on the left end face, right end face and outer peripheral wall of the air-water nozzle core; an O-ring I is provided between the sealing ring groove of the left end face of the air-water nozzle core and the contact surface of the nozzle shell, and between the sealing ring groove of the right end face of the air-water nozzle core and the contact surface of the air-water spray pipe; an O-ring II is provided between the sealing ring groove of the outer peripheral wall of the air-water nozzle core and the contact surface of the nozzle shell.

[0009] The outer peripheral wall of the air-water nozzle is provided with an annular boss on the left end. The left end face of the annular boss contacts the right end face of the air-water nozzle core. The annular boss is locked and limited by the right end face of the nozzle cap. The end of the inner cavity of the air-water nozzle that connects with the air-water nozzle core is a conical mixing chamber. The other end of the inner cavity of the air-water nozzle is a conical mixing section, which is the throat of the air-water nozzle. A sealing ring groove is provided at the contact surface between the outer peripheral wall of the air-water nozzle and the inner wall of the spray gun. An O-ring IV is provided between the sealing groove on the outer peripheral wall of the air-water nozzle and the contact surface between the inner wall of the spray gun and the inner wall of the spray gun.

[0010] The spray gun body cavity has an internal thread on the right side of the three-phase mixing chamber in the middle, and the sandblasting pipe sleeve is connected to it through the thread. The contact surface between the sandblasting pipe sleeve and the spray gun body cavity is provided with an O-ring seal V.

[0011] The spray gun body is provided with a set screw hole, and the air-water spray pipe is locked in the spray gun body by tightening the set screw in the set screw hole.

[0012] The beneficial effects of this invention are as follows: The pre-positioned air-water nozzle creates an air-water delivery system. A high-speed, two-phase air-water jet enters the mixing chamber of a three-phase jet spray gun, accelerating the abrasive material and forming a high-pressure air-carrying abrasive with high-pressure water at its center—a three-phase mixed jet. This jet is then ejected at high speed from the spray gun's blasting pipe onto the workpiece surface, effectively removing and impacting dirt to clean the workpiece. The high-pressure water accelerates the abrasive material during cleaning and, more importantly, wets it. Simultaneously, it creates a uniform, ultra-fine water mist in the cleaning area, suppressing dust and ensuring a dust-free cleaning process that is harmless to operators and causes no secondary pollution to the environment. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present invention;

[0014] Figure 2 This is a schematic diagram of the connection structure between the air-water nozzle core and the high-pressure nozzle of the present invention;

[0015] Figure 3 This is a schematic diagram of the nozzle housing structure of the present invention;

[0016] Figure 4 This is a schematic diagram of the air-water nozzle structure of the present invention;

[0017] In the diagram: 1-High-pressure water connector; 2-Needle-shaped linear liquid jet high-pressure nozzle; 3-Air-water nozzle core; 31-Annular air chamber; 32-High-pressure air nozzle threaded hole; 4-Nozzle housing; 41-Air inlet; 5-High-pressure air elbow; 6-Nozzle cap; 7-Air-water spray pipe; 71-Annular boss; 72-Conical mixing chamber; 73-Air-water spray pipe throat; 8-O-ring I; 9-O-ring II; 10-O-ring III; 11-Sealing gasket; 12-O-ring IV; 13-Spray gun body; 131-Abrasive inlet; 132-Three-phase mixing chamber; 14-O-ring V; 15-Sandblasting pipe sheath; 16-Sandblasting pipe; 17-Abrasive inlet connector; 18-Setting screw; 19-High-pressure air nozzle;

[0018] The following will describe in detail, with reference to the accompanying drawings, embodiments of the invention. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0020] A three-phase gas-liquid-solid jet spray gun includes a high-pressure water connector 1, a needle-shaped linear liquid jet high-pressure nozzle 2, a gas-water nozzle core 3, a nozzle housing 4, a high-pressure air elbow 5, a gas-water spray pipe 7, a spray gun body 13, a sandblasting pipe sheath 15, a sandblasting pipe 16, and a high-pressure air nozzle 19. The high-pressure water connector 1 is threaded into one end of the gas-water nozzle core 3, pressing the needle-shaped linear liquid jet high-pressure nozzle 2 into the central cavity of the gas-water nozzle core 3. An annular air chamber 31 is provided in the middle of the outer periphery of the gas-water nozzle core 3. The bottom of the annular air chamber 31, away from the high-pressure nozzle 2, has six circumferentially distributed, axially extending high-pressure air nozzle threaded holes 32. The high-pressure air nozzle 19 is threaded into the high-pressure nozzle core 3. Inside the threaded hole 32 of the air nozzle, one end of the air-water spray pipe 7 is inserted into the inner cavity of the air-water nozzle core 3 at the end away from the high-pressure nozzle 2. The air-water nozzle core 3 and one end of the air-water spray pipe 7 are fitted into the nozzle housing 4. The air-water nozzle core 3 and the air-water spray pipe 7 are fastened together by the nozzle cap 6 being screwed onto the nozzle housing 4 to form an air-water nozzle. An air inlet 41 is provided on the nozzle housing 4. A high-pressure air elbow 5 is connected to the air inlet 41. The other end of the air-water spray pipe 7 is fitted into one end of the spray gun body 13. The other end of the spray gun body 13 is internally threaded to the sandblasting pipe sleeve 15. A sandblasting pipe 16 is fitted inside the sandblasting pipe sleeve 15. An abrasive inlet connector 17 is connected to the abrasive inlet 131 of the spray gun body 13.

[0021] A sealing gasket 11 is provided on the contact end face between the high-pressure water connector 1 and the needle-shaped linear liquid column high-pressure nozzle 2.

[0022] The outer wall of the needle-shaped linear liquid jet high-pressure nozzle 2 is provided with a sealing ring groove, and an O-ring III10 is provided between the sealing ring groove of the needle-shaped linear liquid jet high-pressure nozzle 2 and the contact surface of the inner wall of the air-water nozzle core 3; sealing ring grooves are provided on the left end face, right end face and outer peripheral wall of the air-water nozzle core 3; an O-ring I8 is provided between the sealing ring groove of the left end face of the air-water nozzle core 3 and the contact surface of the nozzle housing 4, and between the sealing ring groove of the right end face of the air-water nozzle core 3 and the contact surface of the air-water spray pipe 7; an O-ring II9 is ​​provided between the sealing ring groove of the outer peripheral wall of the air-water nozzle core 3 and the contact surface of the nozzle housing 4.

[0023] The outer peripheral wall of the air-water nozzle 7 is provided with an annular boss 71 at the left end. The left end face of the annular boss 71 contacts the right end face of the air-water nozzle core 3. The annular boss 71 is locked and limited by the right end face of the nozzle cap 6. The end of the inner cavity of the air-water nozzle 7 that connects with the air-water nozzle core 3 is a conical tube mixing chamber 72. The conical tube mixing section at the other end of the inner cavity of the air-water nozzle 7 is the air-water nozzle throat 73. A sealing ring groove is provided at the contact surface between the outer peripheral wall of the air-water nozzle 7 and the inner wall of the spray gun body 13. An O-ring IV12 is provided between the sealing groove on the outer peripheral wall of the air-water nozzle 7 and the contact surface between the inner wall of the spray gun body 13 and the sealing groove on the outer peripheral wall of the air-water nozzle 7.

[0024] The inner cavity of the spray gun body 13 has an internal thread on the right side of the three-phase mixing chamber 132 in the middle, and the sandblasting pipe sleeve 15 is connected by the thread. The contact surface between the sandblasting pipe sleeve 15 and the inner cavity of the spray gun body 13 is provided with an O-ring seal V14.

[0025] The spray gun body 13 is provided with a set screw hole. The air-water spray pipe 7 is locked inside the spray gun body 13 by tightening the set screw 18 in the set screw hole.

[0026] The high-pressure water connector 1 is threadedly connected to the air-water nozzle core 3, and the needle-shaped linear liquid jet high-pressure nozzle 2 is pressed and fixed inside the central hole of the air-water nozzle core 3. The sealing gasket 11 seals the contact end face between the high-pressure water connector 1 and the needle-shaped linear liquid jet high-pressure nozzle 2. The O-ring III 10 seals the contact surface between the outer circle of the needle-shaped linear liquid jet high-pressure nozzle 2 and the inner hole of the air-water nozzle core 3, forming a high-pressure water jet channel. The high-pressure water passes through this channel and the needle-shaped linear liquid jet high-pressure nozzle 2 to form a high-pressure linear liquid jet water jet. The O-ring I 8 seals the contact end face between the nozzle housing 4 and the left side of the air-water nozzle core 3. The O-ring II 9 seals the contact surface between the inner hole of the nozzle housing 4 and the outer circle of the air-water nozzle core 3. The high-pressure air nozzle 19 is threadedly fixed in the high-pressure air nozzle threaded holes 32 evenly distributed around the circumference of the air-water nozzle core 3, forming a high-pressure air jet channel. The high-pressure air passes through this channel and the evenly distributed high-pressure air nozzles 19 to form a high-pressure annular hollow air jet. The O-ring I8 seals the air-water nozzle 7 and the right contact end face of the air-water nozzle core 3, forming a closed air-water nozzle 7 conical tube mixing chamber 72, which forms an air-water two-phase jet channel. Through this channel, the high-pressure annular hollow air jet carries the central high-pressure straight column water jet through the conical tube mixing chamber 72 and through the air-water nozzle throat 73, and is accelerated out of the air-water nozzle 7 to form an air-water two-phase jet, which enters the three-phase mixing chamber 132 of the three-phase seepage spray gun body 13. The O-ring IV12 seals the contact surface between the outer surface of the air-water spray pipe 7 and the inner hole of the spray gun body 13. The O-ring V seals the contact end face between the spray gun body 13 and the sandblasting pipe sleeve 15. The sandblasting pipe sleeve 15 is threadedly connected to the spray gun body 13, and the sandblasting pipe 16 is fixed securely, forming a three-phase jet spray gun body 13 three-phase mixing chamber. The air-water two-phase jet entering the three-phase jet spray gun body 13 mixes with the abrasive jet entering from the abrasive inlet joint 17 and is accelerated and ejected from the throat of the sandblasting pipe through the conical mixing chamber of the sandblasting pipe 16, forming a three-phase jet that is sprayed onto the surface of the workpiece for surface treatment.

[0027] Working principle and workflow:

[0028] Step 1, High-Pressure Water Jet: High-pressure water (≤11MP) is delivered via a high-pressure water pipeline to the needle-shaped linear liquid jet high-pressure nozzle 2 through the high-pressure water connector 1, forming a high-pressure linear water jet that passes through the central hole of the air-water nozzle core 3 and enters the center of the mixing chamber of the air-water nozzle throat 73 of the air-water nozzle 7. Together with the annular high-pressure air jet ejected from the high-pressure air nozzles 19 arranged circumferentially on the air-water nozzle core 3, it forms a two-phase jet of air and water that enters the mixing chamber of the throat of the air-water nozzle 7. After being accelerated by the central injection hole of the air-water nozzle 7, it is ejected into the center of the mixing chamber of the three-phase jet spray gun body 13 and ejected at high speed from the central injection hole along the throat (conical tube convergence section) of the sandblasting pipe 16.

[0029] The second step is the high-pressure air jet: High-pressure air is transported through a high-pressure air pipeline, enters the annular air chamber 31 of the air-water nozzle core 3 via the high-pressure air elbow 5, and is then ejected at high speed through the circumferentially arranged high-pressure air nozzles 19 into the conical mixing chamber 72 of the air-water nozzle 7. Together with the central straight water jet, the jet forms a two-phase air-water mixture and is accelerated by the central injection hole of the air-water nozzle 7 before being ejected into the center of the mixing chamber of the three-phase jet spray gun body 13. It is then ejected at high speed from the central injection hole along the convergence section (conical tube convergence section) of the throat of the sandblasting pipe 16, forming a strong negative pressure in the mixing chamber of the sandblasting pipe 16.

[0030] The third step is the abrasive jet: Under the influence of negative pressure, the abrasive's own weight, and the pushing action of low-pressure air, the abrasive flows uniformly in a suspended state in the abrasive delivery pipeline. Passing through the abrasive inlet 131, and under the superimposed effect of the strong negative pressure in the three-phase mixing chamber 132 of the spray gun body 13, the abrasive jet is accelerated and continuously injected into the three-phase mixing chamber 132 of the three-phase jet spray gun body 13, forming an abrasive jet.

[0031] The fourth step is the three-phase mixed jet of high-pressure air jet, high-pressure water jet, and abrasive jet: The high-speed air-water two-phase jet enters the three-phase mixing chamber 132 of the three-phase jet spray gun body 13 from the air-water nozzle 7, accelerating the abrasive entering the three-phase mixing chamber 132 to form a three-phase mixed jet of high-pressure air carrying abrasive and high-pressure water at the center. It is then ejected at high speed from the three-phase mixing chamber 132 along the throat (conical tube aggregation section) of the sandblasting pipe 16 into the central spray hole and onto the surface of the workpiece to peel off and strike the dirt, thereby achieving the purpose of cleaning the workpiece.

[0032] High-pressure water accelerates the abrasive during the cleaning process (similar to the principle of wet blasting), and more importantly, it wets the abrasive. At the same time, it forms a uniform ultra-fine water mist in the workpiece cleaning area to suppress dust. It is harmless to the operator's health and causes no secondary pollution to the environment.

[0033] In the description of the invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" 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 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.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of the invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In this invention, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] The invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the invention is not limited to the above-described manner. Any improvements made using the inventive concept and technical solution, or direct application to other situations without modification, are all within the scope of protection of the invention.

Claims

1. A gas-liquid-solid three-phase jet spray gun, characterized in that, The device includes a high-pressure water connector (1), a needle-shaped linear liquid jet high-pressure nozzle (2), an air-water nozzle core (3), a nozzle housing (4), a high-pressure air elbow (5), an air-water spray pipe (7), a spray gun body (13), a sandblasting pipe sheath (15), a sandblasting pipe (16), and a high-pressure air nozzle (19). The high-pressure water connector (1) is threaded into one end of the air-water nozzle core (3). The high-pressure water connector (1) presses the needle-shaped linear liquid jet high-pressure nozzle (2) into the inner cavity of the central hole of the air-water nozzle core (3). An annular air chamber (31) is provided in the middle of the outer periphery of the air-water nozzle core (3). The bottom of the annular air chamber (31) away from the high-pressure nozzle (2) has six circumferentially distributed high-pressure air nozzle threaded holes (32) extending axially. The high-pressure air nozzle (19) is threaded into the high-pressure air nozzle threaded holes (32). Inside, one end of the air-water nozzle (7) is inserted into the inner cavity of the air-water nozzle core (3) at the end away from the high-pressure nozzle (2). The air-water nozzle core (3) and one end of the air-water nozzle (7) are fitted inside the nozzle housing (4). The air-water nozzle core (3) and the air-water nozzle (7) are fastened together by the nozzle cap (6) screwed onto the nozzle housing (4) to form an air-water nozzle. An air inlet (41) is provided on the nozzle housing (4). A high-pressure air elbow (5) is connected to the air inlet (41). The other end of the air-water nozzle (7) is fitted into one end of the spray gun body (13). The other end of the spray gun body (13) is internally threaded to the sandblasting pipe sleeve (15). The sandblasting pipe sleeve (15) is fitted inside the sandblasting pipe sleeve (16). An abrasive inlet connector (17) is connected to the abrasive inlet (131) of the spray gun body (13).

2. The gas-liquid-solid three-phase jet spray gun according to claim 1, characterized in that, A sealing gasket (11) is provided on the contact end face between the high-pressure water connector (1) and the needle-shaped linear liquid column high-pressure nozzle (2).

3. A gas-liquid-solid three-phase jet spray gun according to claim 2, characterized in that, The outer wall of the needle-shaped straight liquid jet high-pressure nozzle (2) is provided with a sealing ring groove, and an O-ring III (10) is provided between the sealing ring groove of the needle-shaped straight liquid jet high-pressure nozzle (2) and the inner wall of the air-water nozzle core (3); sealing ring grooves are provided on the left end face, right end face and outer peripheral wall of the air-water nozzle core (3); an O-ring I (8) is provided between the sealing ring groove of the left end face of the air-water nozzle core (3) and the contact end face of the nozzle shell (4) and the sealing ring groove of the right end face of the air-water nozzle core (3) and the contact end face of the air-water spray pipe (7); an O-ring II (9) is provided between the sealing ring groove of the outer peripheral wall of the air-water nozzle core (3) and the contact end face of the nozzle shell (4).

4. A gas-liquid-solid three-phase jet spray gun according to claim 3, characterized in that, The outer peripheral wall of the air-water spray pipe (7) is provided with an annular boss (71) at the left end. The left end face of the annular boss (71) is in contact with the right end face of the air-water nozzle core (3). The annular boss (71) is locked and limited by the right end face of the nozzle cap (6). The end of the inner cavity of the air-water spray pipe (7) that is connected to the air-water nozzle core (3) is a conical tube mixing cavity (72). The conical tube mixing section at the other end of the inner cavity of the air-water spray pipe (7) is the air-water spray pipe throat (73). A sealing ring groove is provided at the contact surface between the outer peripheral wall of the air-water spray pipe (7) and the inner wall of the spray gun body (13). An O-ring IV (12) is provided between the sealing groove on the outer peripheral wall of the air-water spray pipe (7) and the contact surface between the inner wall of the spray gun body (13).

5. A gas-liquid-solid three-phase jet spray gun according to claim 4, characterized in that, The inner cavity of the spray gun body (13) has an internal thread on the right side of the three-phase mixing chamber (132) in the middle, and the sandblasting pipe sleeve (15) is connected by the thread. The contact surface between the sandblasting pipe sleeve (15) and the inner cavity of the spray gun body (13) is provided with an O-ring seal V (14).

6. A gas-liquid-solid three-phase jet spray gun according to claim 5, characterized in that, The spray gun body (13) is provided with a set screw hole. The air-water spray pipe (7) is locked inside the spray gun body (13) by tightening the set screw (18) in the set screw hole.

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