An atomizing nozzle for gas atomization powder production

Abstract

The utility model relates to atomization nozzle technical field especially atomization nozzle for gas atomization powder making, include: nozzle body, set up the air inlet channel in the nozzle body on this nozzle body, the nozzle body bottom sets up the atomization area of concave cavity shape, the flow guide pipe is installed at the nozzle body top and is set up for conveying the flow guide channel of metal liquid, the liquid outlet of flow guide pipe and the gas outlet of air inlet channel all are located in the atomization area, the air inlet channel includes the high pressure chamber of intercommunication air inlet and with the low pressure chamber of high pressure chamber intercommunication and the section area less than high pressure chamber, the throat is set up between high pressure chamber and low pressure chamber junction, the low pressure chamber sets up as horizontal direction, the through -hole inner wall for installing flow guide pipe of the nozzle body still sets up the heat insulation groove, for solving the technical problem that the powder collection rate is low and the life is low because of the nozzle bearing height of the gas atomization nozzle of prior art generally existing.

Description

Technical Field

[0001] This utility model relates to the field of atomizing nozzle technology, and in particular to an atomizing nozzle for gas atomization powder making. Background Technology

[0002] Additive manufacturing uses metal powder as raw material, melting and depositing it layer by layer using laser / electron beams to form or bond it into shape. The production technology for high-quality metal powder mainly involves gas atomization, which uses high-pressure gas (inert gas) to break up molten metal flow, producing metal powder with high sphericity, low oxygen content, and controllable particle size. Existing gas atomizing nozzles generally adopt a slit-type structure, mainly consisting of an inlet pipe, an internal gas chamber, and an outlet. The central opening serves as a channel for conveying the molten metal. Due to the high pressure inside the gas chamber and the effects of heat radiation from the molten metal or heat conduction from the channel during operation, prolonged use leads to structural deformation, causing changes in the size of the internal gas chamber and the outlet, affecting key technical indicators such as particle size and morphology of the atomized metal powder.

[0003] The prior art discloses a nozzle structure and atomizing device with optimized coupling angle, with publication number [notation number missing].

[0004] The utility model patent application CN117139634A discloses a nozzle structure including an atomizing spray disc and a guide tube tightly coupled to the atomizing spray disc. The atomizing spray disc consists of a coaxial spray disc cover and a spray disc base. After the spray disc cover and the spray disc base are sealed together, they form a gas resonance chamber and a spray disc outlet. The included angle of the spray disc outlet is 30°-60°. The inner core of the guide tube is a cylindrical hole, and the outer part is an integrally formed cylindrical section and a contraction section. The contraction angle of the contraction section of the guide tube is 20°-50°. By optimizing the coupling angle between the gas injection and the end of the guide tube, the atomization return zone below the guide tube is controlled at a suitable position, achieving a high fine powder yield while effectively reducing the probability of broken metal droplets colliding with the guide tube and the spray disc, successfully avoiding blockage of the guide tube or burn-out of the spray disc. The aforementioned technologies still face numerous challenges, including: ① The nozzle outlet is typically designed as a Laval structure at a certain angle to the axis of the guide tube. To ensure sufficient gas diffusion within the Laval structure, the nozzle requires a significant axial height, leading to an increased guide length for the metal flow and a higher temperature drop within the guide tube. Excessive temperature drop can hinder metal flow fragmentation and reduce powder yield. ② During atomization, the nozzle experiences increased temperature due to heat transfer from the high-temperature metal flow and is subjected to internal pressure from the high-pressure gas, making it highly susceptible to high-temperature creep and consequently reducing nozzle lifespan. ③ Regarding nozzle material selection, conventional techniques typically employ high-temperature alloys and other high-temperature resistant materials to enhance resistance to high-temperature creep. However, this significantly increases the overall cost of the nozzle. Achieving a balance between low cost, high powder production efficiency, and long lifespan is a critical technical challenge that nozzle design urgently needs to address. Utility Model Content

[0005] The purpose of this invention is to provide an atomizing nozzle for gas atomization powder production, which solves the technical problems of low powder yield caused by high nozzle bearing height and short nozzle life due to high temperature and high pressure in the existing gas atomizing nozzles.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An atomizing nozzle for gas atomization powder production includes:

[0008] The nozzle body has an air intake channel located inside the nozzle body, and the bottom of the nozzle body has a concave atomizing area.

[0009] A flow guide tube is installed through the top of the nozzle body and is provided with a flow guide channel for conveying molten metal;

[0010] The liquid outlet of the guide tube and the air outlet of the air inlet channel are both located within the atomization zone. The air inlet channel includes a high-pressure chamber connected to the air inlet and a low-pressure chamber connected to the high-pressure chamber and having a smaller cross-sectional area than the high-pressure chamber. A throat is provided at the connection between the high-pressure chamber and the low-pressure chamber. The low-pressure chamber is set in a horizontal direction. A heat insulation groove is also provided on the inner wall of the through hole on the nozzle body for installing the guide tube.

[0011] Furthermore, a corner for guiding and rectifying airflow is provided at the outlet of the low-pressure chamber. The cross-sectional area of ​​the low-pressure chamber between the throat and the corner varies as follows: the farther away from the throat, the larger the cross-sectional area of ​​the low-pressure chamber.

[0012] Furthermore, the heat insulation groove is configured as an annular groove arranged along the circumference of the guide tube, and the top and bottom of the annular groove do not penetrate the nozzle body.

[0013] Furthermore, the highest point P of the throat is on the same horizontal line as the highest point of the lower cavity surface of the low-pressure chamber. The lower cavity surface of the low-pressure chamber is higher the further away from the throat. The highest point of the throat is lower than the highest point of the high-pressure chamber. The lower cavity surface of the throat located between the low-pressure chamber and the high-pressure chamber is set as an arc transition surface.

[0014] Furthermore, the extended line of the side of the air outlet near the center line of the guide tube intersects the center line below the guide tube, and the concave cavity of the atomizing area is funnel-shaped. This funnel shape is a trapezoidal concave cavity formed by extending downward from the side of the air outlet of the air inlet channel away from the center line to the bottom of the nozzle body.

[0015] Furthermore, the distance from the highest point of the throat to the center line is the throat center diameter a, the distance from the high-pressure chamber inlet to the center line is the internal diameter of the air chamber b, the external diameter of the guide pipe is c, the depth of the heat insulation groove is d, the height of the heat insulation groove is f, the lower edge distance of the heat insulation groove is g, and the distance from the outlet to the top of the nozzle body is the total height e of the upper spray inner hole, where a = (25~45) mm, b = (1.5~2.5)a, c = (6~22) mm, d = (0.2~0.8) mm, e = (15~25) mm, f = (0.6~0.8)e, g = (0.1~0.2)e, and f+g<e.

[0016] Furthermore, the angle between the line connecting the highest point of the upper cavity surface of the low-pressure chamber and the line connecting the lowest point of the lower cavity surface of the low-pressure chamber is the expansion angle m; the angle between the line connecting the highest point of the upper cavity surface of the low-pressure chamber and the horizontal plane is n; the angle between the side of the air outlet near the center line of the guide tube and the center line is the air outlet convergence angle o; and the angle between the outer peripheral surface of the atomization zone is β, where m = 4–16°, n = 0–0.5m, o = 5–45°, and 75° < β < 90°.

[0017] Furthermore, the liquid outlet of the guide tube is set as a conical end, and the intersection point x of the extended line of the side of the air outlet near the center line is located below the intersection point y of the extended line of the conical end of the guide tube.

[0018] Furthermore, the flow channel includes a constricted section and a direct flow section, wherein the direct flow section is used to connect the constricted section and the outlet. The diameter of the lowest point of the constricted section is equal to the diameter of the direct flow section, and the diameter of the highest point of the constricted section is greater than the diameter of the direct flow section. The taper of the constricted section is 1:(2.5~5.5).

[0019] Furthermore, the connection between the air outlet and the lower cavity surface of the low-pressure chamber is rounded.

[0020] Compared with the prior art, the technical solution of this utility model has the following beneficial effects:

[0021] (1). By setting the internal shape of the air intake channel, the present invention sets a throat between the high-pressure chamber and the low-pressure chamber of the air intake channel and sets the low-pressure chamber to be horizontal, thus avoiding the need for the guide tube to have a long axial height in order to ensure sufficient airflow diffusion in conventional prior art. This shortens the guide tube length, thereby reducing the temperature drop of the metal flow in the guide tube and reducing the difficulty of breaking the metal flow. At the same time, combined with the design of the heat insulation groove, it not only helps to reduce the temperature drop of the metal flow, but also prevents the nozzle body from being subjected to high-temperature creep deformation under the impact of high-pressure gas due to the heat conduction and heat transfer of the metal flow. The two work together to ensure the powder yield requirement and extend the service life of the nozzle.

[0022] (2). By limiting the shape and size of each position of the air intake channel, this utility model achieves a reasonable gas jet convergence angle and the impact angle between the airflow and the liquid flow, thereby avoiding splashing during the atomization of the metal flow, which would block the liquid outlet of the guide tube. At the same time, it can also ensure the lowest temperature drop of the metal flow and the high energy transfer efficiency of the high-pressure gas flow, which greatly improves the atomization efficiency of the nozzle. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the main structure of the nozzle of this utility model;

[0024] Figure 2 This is a top view of the nozzle structure of this utility model;

[0025] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure at point AA;

[0026] Figure 4 for Figure 2 Detailed dimension annotations for various parts of the structure;

[0027] Figure 5 is a comparison diagram of the internal pressure of the nozzle of this invention and the existing nozzle.

[0028] In the diagram: 100, Nozzle body; 101, Air inlet; 102, High-pressure chamber; 103, Low-pressure chamber; 104, Air outlet; 105, Atomizing zone; 106, Heat insulation groove; 107, Throat; 108, Corner.

[0029] 200. Flow guide pipe; 201. Flow guide channel; 2011. Narrowing section; 2012. Direct transport section; 202. Conical end. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent.

[0032] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0033] In the following description, when referring to the accompanying drawings, the same numbers in different drawings denote the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0034] In the description of this application, it should be understood that the terms "first," "second," "third," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0035] Furthermore, in the description of this application, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0036] To address the limitations of existing technologies, this embodiment provides a technical solution. The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0037] This invention addresses the common problems in existing technologies where conventional nozzles, during gas atomization operations, suffer from high axial height of the guide tube 200 due to the need for sufficient gas diffusion, resulting in a significant drop in molten metal temperature and affecting powder yield. It also addresses the issue that the nozzle's air inlet channel is prone to high-temperature creep under high pressure and high temperature regulation, leading to a reduction in nozzle lifespan. The invention provides technical optimizations and improvements to these issues.

[0038] See appendix Figure 1-3 A gas atomizing nozzle for powder production includes: a nozzle body 100, on which an air inlet channel is provided for introducing high-pressure gas; a concave atomizing zone 105 is provided at the bottom of the nozzle body 100; the nozzle body 100 can be disc-shaped or other shapes; the air inlet channel inside the nozzle body 100 can be 3D printed or the nozzle body 100 can be made as a separate part, and the air inlet channel can be machined or injection molded; the atomizing zone 105 is a concave cavity formed by the inward indentation at the bottom of the nozzle body 100; the outlet of the guide pipe 200 passes through the nozzle body 100 and is located within the atomizing zone 105; the guide pipe 200 is installed through and installed at the top of the nozzle body 100 and is provided with a guide channel 201 for conveying molten metal. It is understood that the molten metal is a high-temperature molten metal guide pipe 200 installed on the nozzle body 100. The guide channel 201 includes a constriction section 2011 and a direct conveying section 2012. The direct conveying section 2012 is used to connect the constriction section 2011 and the outlet. The diameter of the lowest point of the constriction section 2011 is equal to the diameter of the direct conveying section 2012, and the diameter of the highest point of the constriction section 2011 is greater than the diameter of the direct conveying section 2012. The taper of the constriction section 2011 is 1: (2.5~5.5). It can be understood that the high-temperature molten metal enters through the constriction section 2011 and flows out through the outlet along the direct conveying section 2012. The design of the constriction section 2011 and the direct conveying section 2012 helps to stabilize the liquid column, suppress pulsation, improve the uniformity of flow rate, optimize the crushing effect, reduce the oxidation and pollution of molten metal, prevent solidification and nozzle blockage, and maximize the yield of fine powder.

[0039] See appendix Figure 3The liquid outlet of the guide tube 200 and the air outlet 104 of the air inlet channel are both located in the atomization zone 105. The air inlet channel includes a high-pressure chamber 102 connected to the air inlet 101 and a low-pressure chamber 103 connected to the high-pressure chamber 102 and having a cross-sectional area smaller than the high-pressure chamber 102. A throat 107 is provided at the connection between the high-pressure chamber 102 and the low-pressure chamber 103. The low-pressure chamber 103 is configured to be horizontal. It can be understood here that the air intake channel consists of two or more channels that are centrally symmetrical along the axis of the guide pipe 200. Each air intake channel is connected to an external high-pressure gas supply source through the air intake port 101. Then, the high-pressure chamber 102, throat 107, low-pressure chamber 103, and air outlet 104 are arranged in sequence. The throat 107 is the part with the smallest cross-sectional area in the entire channel. The air outlet 104 of the low-pressure chamber 103 is provided with a corner 108 for airflow guidance and rectification. The cross-sectional area of ​​the low-pressure chamber 103 located between the throat 107 and the corner 108 varies as follows: the farther away from the throat 107, the larger the cross-sectional area of ​​the low-pressure chamber 103. The highest point P of the throat 107 is on the same horizontal line as the highest point of the lower cavity surface of the low-pressure cavity 103. The lower cavity surface of the low-pressure cavity 103 is higher the farther away from the throat 107. This can be understood as the cavity cross-sectional area increasing from the throat 107 to the low-pressure cavity 103. The highest point P of the throat 107 and the highest point h of the lower cavity surface of the low-pressure cavity 103 are on the same horizontal line, which can be understood as the lower cavity surface of the low-pressure cavity 103 being inclined and higher the farther away from the throat 107. The highest point of 107 is lower than the highest point of the high-pressure chamber 102. This can be understood as the transition from the high-pressure chamber 102 to the throat 107 being a contraction phase. The lower surface of the throat 107, located between the low-pressure chamber 103 and the high-pressure chamber 102, is set as an arc-shaped transition surface. The arc-shaped transition surface is used to facilitate more uniform and stable gas delivery, reducing instability in gas flow caused by dead zones. The extended line of the side of the outlet 104 closest to the centerline of the guide tube 200 intersects the centerline below the guide tube 200. The concave cavity of the atomizing zone 105 is funnel-shaped, wider at the bottom and narrower at the top. This funnel shape is a trapezoidal concave cavity formed by extending downwards from the side of the outlet 104 away from the centerline to the bottom of the nozzle body 100. The connection between the outlet 104 and the lower surface of the low-pressure chamber 103 is rounded. A heat insulation groove 106 is also provided on the inner wall of the through hole for installing the guide pipe 200 on the nozzle body 100. The heat insulation groove 106 is set as an annular groove along the circumference of the guide pipe 200. The top and bottom of the annular groove do not penetrate the nozzle body 100. The purpose of the heat insulation groove 106 is to reduce the contact area between the guide pipe 200 and the nozzle body 100, thereby reducing the heat transfer from the high-temperature metal in the guide pipe 200 to the nozzle body 100, and thus avoiding high-temperature creep in the air intake channel.

[0040] See appendix Figure 4 The distance from the highest point P of the throat 107 to the center line is the center diameter a of the throat 107. The distance from the air inlet 101 of the high-pressure chamber 102 to the center line is the internal diameter b of the air chamber. In this article, the center line refers to the central axis of the guide channel 201 inside the guide tube 200. Here, the internal diameter b of the air chamber can be understood as follows: the air inlet 101 is a through hole, and the lower cavity surface of the throat 107 located between the high-pressure chamber 102 and the low-pressure chamber 103 is an arc transition surface. The distance between the boundary line between the arc transition surface and the air inlet 101 and the center line is the internal diameter b of the air chamber. The outer diameter of the guide pipe 200 is c, the depth of the heat insulation groove 106 is d, the height of the heat insulation groove 106 is f, and the lower edge distance of the heat insulation groove 106 is g. Here, the height of the heat insulation groove 106 refers to the length of the heat insulation groove 106 along the axial direction, and the lower edge distance of the heat insulation groove 106 refers to the distance from the lowest point of the heat insulation groove 106 to the nozzle outlet 104. The distance between the outlet 104 and the top of the nozzle body 100 is the total height e of the upper spray inner hole, where a = (25~45) mm, b = (1.5~2.5) a, c = (6~22) mm, d = (0.2~0.8) mm, e = (15~25) mm, f = (0.6~0.8) e, g = (0.1~0.2) e, and f + g < e. The angle between the line connecting the highest point of the upper cavity surface of the low-pressure cavity 103 and the line connecting the lowest point of the lower cavity surface of the low-pressure cavity 103 is the expansion angle m. The angle between the line connecting the highest point of the upper cavity surface of the low-pressure cavity 103 and the horizontal plane is n. The angle between the side of the air outlet 104 near the center line of the guide tube 200 and the center line is the convergence angle θ of the air outlet 104. The angle between the outer peripheral surface of the atomizing zone 105 and the center line is β. Where m = 4°~16°, n = (0~0.5)m, θ = 5°~45°, and 75°<β<90°. The liquid outlet of the guide tube 200 is set as a conical end 202. The intersection point x of the extended line of the air outlet 104 near the center line is located below the intersection point y of the extended line of the conical end 202 of the guide tube 200. It can also be understood that the air outlet 104 is a ring-shaped air outlet. By limiting the shape and size of each position of the air inlet channel, a reasonable gas jet convergence angle and the impact angle between the airflow and the liquid flow are achieved. This avoids splashing during metal flow atomization, which could block the liquid outlet of the guide tube 200. At the same time, it can also ensure the lowest temperature drop of the metal flow and the high energy transfer efficiency of the high-pressure gas flow, which greatly improves the atomization efficiency of the nozzle.

[0041] The following examples 1-5 and comparative examples 1-4 are described by changing the numerical settings of various parameters of the nozzle body 100 and the guide tube 200, as shown in Table 1 below. In addition, comparative tests were conducted on the nozzles prepared in examples 1-5 and comparative examples 1-4 under the same conditions to detect the change in powder particle size, the yield of powder of 15-53μm, and the service life of the nozzle. The powder particle size was tested using a laser particle size analyzer (ISO 13320), the powder yield was tested using the dry sieving method (GB / T 1480), and the nozzle service life was measured using the upper cover deformation measurement method, specifically using a ruler or feeler gauge. The specific results are shown in Table 2 below.

[0042] Table 1. Parameter Comparison Table for Each Embodiment and Comparative Example

[0043]

[0044] Table 2 Comparison of experimental data for each embodiment and comparative example

[0045]

[0046] By comparing the test results of Examples 1-5 and Comparative Examples 1-4 in Table 2 above, it can be seen that by setting reasonable parameters, especially the value of the throat center diameter a and the ratio of the throat center diameter a to the internal diameter b of the air chamber, along with the outer diameter c of the guide tube and the depth and width of the heat insulation groove 106, the distance between the high-pressure chamber 102 of the intake channel and the guide tube 200 is extended. Simultaneously, by utilizing the horizontally set low-pressure chamber 103, the problem of a long axial height of the guide tube 200 in conventional technologies to ensure sufficient airflow diffusion is avoided. This facilitates shortening the guide length of the guide tube 200, greatly reducing the contact time and contact area between the high-temperature metal flow and the nozzle body, thereby reducing the temperature drop of the metal flow in the guide tube 200. Furthermore, combined with the setting of the heat insulation groove 106, it further reduces the heat loss of the metal flow, effectively isolating the high-pressure airflow from the guide tube 200, that is, isolating the high-pressure part of the intake channel from the high-temperature part near the guide tube 200. To avoid the common problem of deformation caused by high-pressure airflow under high temperature conditions in existing technologies, the setting of the expansion angle m and the angle n between the line connecting the highest point of the upper cavity surface of the low-pressure chamber 103 and the horizontal plane helps to ensure that the airflow resistance is small, thereby reducing friction loss and ensuring that the airflow is ejected at the designed maximum speed. At the same time, the coordination of various angles such as the outlet convergence angle o and the outer peripheral surface angle β of the atomization zone ensures that all airflows achieve precise convergence and collision in a very small focal area, which is the outlet of the metal flow. At this point, the airflow velocity reaches its maximum value, i.e., supersonic speed, generating extremely high and instantaneous shear force on the metal liquid column. While avoiding deformation of the air intake channel and extending the nozzle life, it can also ensure the impact force of the airflow, obtain finer powder, and improve the powder yield of metal powder. Moreover, the converged high-speed airflow forms a negative pressure zone, which plays a certain role in focusing and stabilizing the falling metal column, preventing it from deviating, while isolating air and reducing oxidation, achieving the most efficient energy transfer and a high powder yield. Meanwhile, the constraints on various parameters also improved the pressure state of the nozzle body. This can be seen in Figure 5, which uses computational fluid dynamics software to simulate the pressure conditions of nozzles with different structures under the same pressure conditions. Figure 5a This is a diagram showing the pressure conditions of the existing nozzle. Figure 5bThis diagram illustrates the pressure conditions of the nozzle in this application. Red represents high pressure, and blue represents low pressure. As can be seen from the diagram, when the high-pressure zone inside the nozzle is far from the center, combined with the design of the heat insulation groove 106 and the limitations of various parameters such as the total height e of the upper spray inner hole, the height f of the heat insulation groove 106, and the lower edge distance g of the heat insulation groove 106, the heat transfer between the guide tube 200 and the nozzle body is reduced while ensuring the overall strength of the nozzle body. This not only helps to reduce the temperature drop of the metal flow in the guide tube and reduce the difficulty of pulverizing the molten metal, but also prevents the nozzle body from undergoing high-temperature creep under the dual action of high-pressure gas after being heated due to heat transfer. The temperature gradient is small, and the structure is more compact, effectively reducing thermal stress and enhancing thermal shock resistance, thereby effectively extending the service life of the nozzle body.

[0047] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0048] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An atomizing nozzle for gas atomization powder production, characterized in that, include: The nozzle body (100) has an air intake channel located inside the nozzle body (100), and the bottom of the nozzle body (100) has a concave atomizing area (105); A guide tube (200) is installed through the top of the nozzle body (100) and has a guide channel (201) for conveying molten metal. The liquid outlet of the guide tube (200) and the air outlet (104) of the air inlet channel are both located in the atomization zone (105). The air inlet channel includes a high-pressure chamber (102) connected to the air inlet (101) and a low-pressure chamber (103) connected to the high-pressure chamber (102) and having a cross-sectional area smaller than the high-pressure chamber (102). A throat (107) is provided at the connection between the high-pressure chamber (102) and the low-pressure chamber (103). The low-pressure chamber (103) is set in a horizontal direction. A heat insulation groove (106) is also provided on the inner wall of the through hole on the nozzle body (100) for installing the guide tube (200).

2. The atomizing nozzle for gas atomization powder production according to claim 1, characterized in that, The outlet (104) of the low-pressure chamber (103) is provided with a corner (108) for airflow guidance and rectification. The cross-sectional area of ​​the low-pressure chamber (103) between the throat (107) and the corner (108) varies as follows: the farther away from the throat (107), the larger the cross-sectional area of ​​the low-pressure chamber (103).

3. The atomizing nozzle for gas atomization powder production according to claim 1, characterized in that, The heat insulation groove (106) is configured as an annular groove arranged around the circumference of the guide tube (200), and the top and bottom of the annular groove do not penetrate the nozzle body (100).

4. The atomizing nozzle for gas atomization powder production according to claim 2, characterized in that, The highest point P of the throat (107) is on the same horizontal line as the highest point of the lower cavity surface of the low-pressure cavity (103). The lower cavity surface of the low-pressure cavity (103) is higher the further away from the throat (107). The highest point of the throat (107) is lower than the highest point of the high-pressure cavity (102). The lower cavity surface of the throat (107) located between the low-pressure cavity (103) and the high-pressure cavity (102) is set as an arc transition surface.

5. The atomizing nozzle for gas atomization powder production according to claim 4, characterized in that, The extension line of the side of the air outlet (104) near the center line of the guide tube (200) intersects the center line below the guide tube (200). The cavity shape of the atomizing area (105) is funnel-shaped. The funnel shape is a trapezoidal cavity formed by extending downward from the side of the air outlet (104) away from the center line of the air inlet channel to the bottom of the nozzle body (100).

6. The atomizing nozzle for gas atomization powder production according to claim 5, characterized in that, The distance from the highest point of the throat (107) to the center line is the center diameter a of the throat (107), the distance from the air inlet (101) of the high-pressure chamber (102) to the center line is the internal diameter b of the air chamber, the outer diameter of the guide pipe (200) is c, the depth of the heat insulation groove (106) is d, the height of the heat insulation groove (106) is f, the lower edge distance of the heat insulation groove (106) is g, and the distance from the air outlet (104) to the top of the nozzle body (100) is the total height e of the upper spray inner hole, where a = (25~45) mm, b = (1.5~2.5) a, c = (6~22) mm, d = (0.2~0.8) mm, e = (15~25) mm, f = (0.6~0.8) e, g = (0.1~0.2) e, and f+g<e.

7. The atomizing nozzle for gas atomization powder production according to claim 6, characterized in that, The angle between the line connecting the highest point of the upper cavity surface of the low-pressure cavity (103) and the line connecting the lowest point of the lower cavity surface of the low-pressure cavity (103) is the expansion angle m. The angle between the line connecting the highest point of the upper cavity surface of the low-pressure cavity (103) and the horizontal plane is n. The angle between the side of the air outlet (104) near the center line of the guide tube (200) and the center line is the convergence angle of the air outlet (104) θ. The angle between the outer circumference of the atomizing zone (105) and the center line is β. Where m = 4° to 16°, n = (0 to 0.5) m, θ = 5° to 45°, and 75° < β < 90°.

8. The atomizing nozzle for gas atomization powder production according to claim 7, characterized in that, The liquid outlet of the guide tube (200) is set as a conical end (202), and the intersection point x of the extension line of the side of the air outlet (104) near the center line is located below the intersection point y of the extension line of the conical end (202) of the guide tube (200).

9. An atomizing nozzle for gas atomization powder production according to claim 8, characterized in that, The flow channel (201) includes a constricted section (2011) and a direct conveying section (2012), wherein the direct conveying section (2012) is used to connect the constricted section (2011) and the liquid outlet. The diameter of the lowest point of the constricted section (2011) is equal to the diameter of the direct conveying section (2012), and the diameter of the highest point of the constricted section (2011) is greater than the diameter of the direct conveying section (2012). The taper of the constricted section (2011) is 1:(2.5~5.5).

10. An atomizing nozzle for gas atomization powder production according to claim 9, characterized in that, The connection between the air outlet (104) and the lower cavity surface of the low-pressure chamber (103) is rounded.

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