Gas nozzle
By designing a dual-channel gas nozzle in the arc printing equipment, radial and axial protective airflow is used to prevent nozzle clogging and oxidation, thus extending service life.
Patent Information
- Application Number
- CN202520316900.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-26
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-02-26
AI Technical Summary
Gas nozzles in arc printing equipment are easily clogged by splatter, resulting in a shortened lifespan.
A dual-channel gas nozzle is designed, in which the first and second gas flow channels converge inside the nozzle to form radial and axial protective airflows, blocking splashes and protecting the molten pool.
It effectively avoids nozzle clogging, extends service life, reduces nozzle temperature, and prevents oxidation.
Smart Images
Figure CN223864340U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of additive manufacturing and relates to a gas nozzle, and more particularly to a dual-channel gas nozzle. Background Technology
[0002] Arc printing is a 3D printing method that uses metal wire as raw material and an electric arc as a heat source to perform surfacing. This method has advantages such as low raw material cost, high material utilization, high printing efficiency, and high workpiece density. However, the gas nozzles in arc printing equipment have the following problems: during printing, the gas nozzle is close to the molten pool, and the nozzle temperature is high, causing spatter to adhere to the inside of the nozzle, clogging it. This not only requires regular cleaning but also increases the difficulty of cleaning and reduces the lifespan of the gas nozzle. Utility Model Content
[0003] In order to solve the above-mentioned problems in the background art, the present invention provides a gas nozzle that can effectively avoid nozzle clogging and extend nozzle service life.
[0004] To achieve the above objectives, the present invention adopts the following technical solution:
[0005] A gas nozzle includes a nozzle body, characterized in that: the gas nozzle includes a second airflow channel disposed inside the nozzle body and a first airflow channel extending into the nozzle body; the axis of the first airflow channel is not parallel to the axis of the second airflow channel; the airflow entering from the first airflow channel and the airflow entering from the second airflow channel converge at a convergence point inside the nozzle body.
[0006] The nozzle body includes an inlet and an outlet. The second airflow channel is located inside the nozzle body and extends from the inlet to the outlet of the nozzle body. The first airflow channel extends from the outside of the nozzle body to the inside of the nozzle body.
[0007] The end of the first airflow channel is provided with an air outlet that communicates with the inside of the nozzle body. The airflow flowing out of the air outlet of the first airflow channel and the airflow flowing out of the end of the second airflow channel meet at the intersection point inside the nozzle body.
[0008] The aforementioned air outlet is a single hole, a connected hole, or an annular groove located on the inner wall of the nozzle body.
[0009] The aforementioned single holes or connected holes are one or more. When there are multiple single holes or connected holes, the multiple single holes or multiple connected holes are evenly or non-evenly distributed on the inner wall of the nozzle body.
[0010] The aforementioned multiple single holes or multiple connected holes are evenly or non-evenly distributed along the radial direction of the nozzle body on the inner wall of the nozzle body.
[0011] The aforementioned multiple single holes or multiple connected holes are evenly or non-evenly distributed along the radial direction of the nozzle body on the same height band of the inner wall of the nozzle body.
[0012] The aforementioned intersection point is located at or near the outlet of the nozzle body.
[0013] The nozzle body includes an inner shell and an outer shell located outside the inner shell; the inner shell and the outer shell form an integral structure; the gas nozzle also includes a flow guide section located between the outer shell and the inner shell, the flow guide section being connected to the first airflow channel; the axis of the flow guide section is not parallel to the axis of the first airflow channel.
[0014] The aforementioned flow guide section is arranged along the outer shape of the nozzle body or surrounds the nozzle body; the nozzle body is an integral structure or a split structure.
[0015] The advantages of this utility model are:
[0016] This invention provides a gas nozzle, comprising a nozzle body, a second airflow channel located inside the nozzle body, and a first airflow channel extending into the nozzle body. The axis of the first airflow channel is not parallel to the axis of the second airflow channel. The airflow entering from the first airflow channel and the airflow entering from the second airflow channel converge at a junction point inside the nozzle body. This invention, by designing a dual-channel structure inside the gas nozzle, divides the direction of the protective gas into two directions. The radial protective gas forms an air curtain that can, to a certain extent, block splashes from reaching the interior of the gas, preventing nozzle blockage; the axial protective gas can protect the molten pool, preventing oxidation. Simultaneously, the protective gas entering from the first airflow channel has a lower temperature, which can cool the nozzle to a certain extent, further preventing splashes from adhering to the nozzle body. This invention has a simple structure, effectively preventing splashes from entering the nozzle and forming adhesions, thus extending the service life of the gas nozzle. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the overall structure of the gas nozzle provided by this utility model;
[0018] Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure;
[0019] in:
[0020] 1-First airflow channel; 2-Second airflow channel; 3-Confluence point; 4-Diverter; 5-Conductive nozzle. Detailed Implementation
[0021] See Figure 1 as well as Figure 2This utility model provides a gas nozzle, including a nozzle body, a conductive nozzle 5 disposed within the nozzle body along its axial direction, and a flow divider 4 disposed above the conductive nozzle 5 for supplying protective gas into the nozzle body. The protective gas formed by the flow divider 4 moves downwards along the axial direction of the nozzle body within the nozzle body, forming a second airflow channel 2. Simultaneously, this utility model also includes a first airflow channel 1 extending from the outside of the nozzle body into its interior. The end of the first airflow channel 1 has an outlet communicating with the interior of the nozzle body. The airflow flowing out of the outlet of the first airflow channel 1 and the airflow flowing out from the end of the second airflow channel 2 converge at a confluence point 3 within the nozzle body. The nozzle body includes an inlet and an outlet. The second airflow channel 2 is located inside the nozzle body and extends from the inlet to the outlet. For example, the second airflow channel 2 can be disposed along the axial direction of the nozzle body within the nozzle body. The axis of the first airflow channel 1 and the axis of the second airflow channel 2 are not parallel. For example, the angle between the axis of the first airflow channel 1 and the axis of the second airflow channel 2 is a non-acute angle. Figure 2 For example, the angle between the axis of the first airflow channel 1 and the axis of the second airflow channel 2 is an obtuse angle. At this time, the airflow entering from the first airflow channel 1 and the airflow entering from the second airflow channel 2 converge at the intersection point 3 inside the nozzle body. Due to the interaction of fluid kinetic energy, the direction of the protective gas after the convergence can be roughly divided into radial protective gas ( Figure 2 (in direction A) and axial protective gas ( Figure 2 (in the B direction), radial protective gas forming an air curtain ( Figure 2 The A direction in the middle can, to some extent, prevent splashes from reaching the interior of the gas, thus avoiding nozzle clogging; axial protective gas ( Figure 2 The B direction in the middle can protect the molten pool and prevent oxidation.
[0022] It should be noted that, in order to better achieve the effect shown above (avoiding nozzle clogging and protecting the molten pool), the confluence point 3 can be placed at or near the outlet of the nozzle body. For example, see [link to example]. Figure 2 The position of the intersection point 3 can be set above the outlet of the nozzle body, and the distance from the outlet of the nozzle body is 1 / 4 to 1 / 5 of the length of the entire nozzle body. Of course, other distances are also possible, but it is preferred to be closer to the outlet of the nozzle body, which is more conducive to the formation of the air curtain of radial protective gas and the axial protective gas.
[0023] It should be noted that the air outlet is a single hole, a combined hole, or an annular groove located on the inner wall of the nozzle body. The cross-section of a single hole can be circular, rectangular, or any other arbitrary shape, which will not be elaborated here; the cross-section of a combined hole can be any shape such as waist-shaped, gourd-shaped, or ∞-shaped.
[0024] For example, when the air outlet of the first airflow channel 1 (taking a single hole as an example, the same method applies to integrated holes) is one, air can be blown from one side of the nozzle body to the corresponding other side, forming a protective air curtain covering the inner diameter of the nozzle body, but sufficient airflow pressure is required. In this case, to form an air curtain with a larger radial area, the present invention can configure multiple air outlets at the end of the first airflow channel 1. That is, when the airflow flowing from the end of the second airflow channel 2 merges with the airflow flowing from multiple air outlets at the end of the first airflow channel 1, a larger air curtain will be formed. For example, see below. Figure 2 When the first airflow channel 1 has multiple outlets, these outlets extend radially into the nozzle body. The airflow from the multiple outlets of the first airflow channel 1 and the airflow from the second airflow channel 2 converge at multiple convergence points 3 within the nozzle body. For example, when the outlet is a single hole or a multi-hole, especially when there are multiple single holes or multi-holes, these holes are evenly or non-evenly distributed on the inner wall of the nozzle body, particularly on the same height band of the inner wall. In this case, the thickness of the height band determines the thickness of the air curtain, providing more adequate radial protection.
[0025] For example, see Figure 2 The nozzle body includes an inner shell and an outer shell disposed outside the inner shell; the inner shell and the outer shell form an integral structure; the gas nozzle also includes a flow guide section disposed between the outer shell and the inner shell, the flow guide section being connected to the first airflow channel 1. Exemplarily, the flow guide section is arranged along the outer shape of the nozzle body or surrounds the nozzle body. The form of the flow guide section is not limited to... Figure 2 Any design that can create a radial air curtain to block spatter and an axial airflow to protect the molten pool is acceptable; further details will not be provided here. See also Figure 2 Taking the arrangement of the guide section along the outer shape of the nozzle body as an example, external protective gas is introduced into the nozzle body. Initially, it flows obliquely downward in the guide section along the direction of the nozzle body. After reaching the bottom, it flows obliquely upward along the first airflow channel 1 and escapes from the outlet of the first airflow channel 1. At this time, it merges with the airflow introduced through the second airflow channel 2 at the intersection point 3 inside the nozzle body, thereby forming radial protective gas. Figure 2 (in direction A) and axial protective gas ( Figure 2 (in direction B). On the one hand, by changing the direction of movement of the protective airflow, radial protective air and axial protective air can be formed. On the other hand, the temperature of the airflow entering the first airflow channel 1 from the guide section is adjustable and controllable. For example, the temperature of the protective air entering the first airflow channel 1 from the guide section can be adjusted to be relatively low, which can cool the nozzle to a certain extent and further prevent the splashes from sticking to the nozzle body, thus achieving the purpose of cooling.
[0026] For example, the nozzle body can be a one-piece or a split structure. For example, when it is a one-piece structure, it can be formed in one piece using 3D printing technology. When it is a split structure, it can be processed independently and the inner and outer shells can be combined together using existing technologies to form a stable nozzle body. Of course, regardless of whether the nozzle body is a one-piece or split structure, the processing is already possible using existing technologies, and will not be elaborated further here.
Claims
1. A gas nozzle, comprising a nozzle body, characterized in that: The gas nozzle includes a second airflow channel (2) located inside the nozzle body and a first airflow channel (1) extending into the nozzle body; the axis of the first airflow channel (1) is not parallel to the axis of the second airflow channel (2); the airflow entering from the first airflow channel (1) and the airflow entering from the second airflow channel (2) converge at the intersection point (3) inside the nozzle body.
2. The gas nozzle according to claim 1, characterized in that: The nozzle body includes an inlet and an outlet, the second airflow channel (2) is located inside the nozzle body and extends from the inlet to the outlet of the nozzle body; the first airflow channel (1) extends from the outside of the nozzle body to the inside of the nozzle body.
3. The gas nozzle according to claim 2, characterized in that: The end of the first airflow channel (1) is provided with an air outlet that communicates with the inside of the nozzle body. The airflow flowing out from the air outlet of the first airflow channel (1) and the airflow flowing out from the end of the second airflow channel (2) meet at the intersection point (3) inside the nozzle body.
4. The gas nozzle according to claim 3, characterized in that: The air outlet is a single hole, a connected hole, or an annular groove located on the inner wall of the nozzle body.
5. The gas nozzle according to claim 4, characterized in that: There are one or more single holes or connected holes. When there are multiple single holes or connected holes, the multiple single holes or multiple connected holes are evenly or non-evenly distributed on the inner wall of the nozzle body.
6. The gas nozzle according to claim 5, characterized in that: The plurality of single holes or plurality of connected holes are evenly or non-evenly distributed along the radial direction of the nozzle body on the inner wall of the nozzle body.
7. The gas nozzle according to claim 6, characterized in that: The plurality of single holes or plurality of connected holes are evenly or non-evenly distributed along the radial direction of the nozzle body on the same height band of the inner wall of the nozzle body.
8. The gas nozzle according to any one of claims 1-7, characterized in that: The intersection point (3) is located at or near the outlet of the nozzle body.
9. The gas nozzle according to claim 8, characterized in that: The nozzle body includes an inner shell and an outer shell placed outside the inner shell; the inner shell and the outer shell form an integral structure; the gas nozzle also includes a flow guide section placed between the outer shell and the inner shell, the flow guide section being connected to the first airflow channel (1); the axis of the flow guide section is not parallel to the axis of the first airflow channel (1).
10. The gas nozzle according to claim 9, characterized in that: The flow guide section is arranged along the outline of the nozzle body or surrounds the nozzle body; the nozzle body is an integral structure or a split structure.