Nozzle of an atmospheric pressure jet plasma spray gun

Abstract

This invention proposes a nozzle for an atmospheric pressure jet plasma spray gun, comprising a nozzle body with an inclined jet cavity. The outlet end of the jet cavity has a large hole, and a ring of smaller holes is arranged around the outer side of the large hole. The large hole is eccentrically positioned with its axis parallel to the jet cavity axis but offset from it, located closer to the edge of the nozzle body. This invention designs the large hole as an eccentric hole, increasing the distance between the large hole and the easily eroded smaller holes at the edge, thus balancing the erosion rate across different areas of the nozzle and solving the problem of short lifespan caused by localized high-temperature erosion.

Description

Technical Field

[0001] This utility model relates to the field of plasma spray gun technology, and in particular to a nozzle for an atmospheric pressure jet plasma spray gun. Background Technology

[0002] The core principle of atmospheric pressure jet plasma nozzle is to construct a high-frequency high-voltage electric field through internal and external electrodes to ionize the gas (such as air, nitrogen, etc.) flowing through the nozzle, generate a highly active plasma jet, and finally spray it out from the nozzle and act on the material surface. It is widely used in industrial scenarios such as cleaning and modification (such as FPC flexible board pretreatment and 3C mobile terminal pretreatment before dispensing to improve adhesion).

[0003] However, existing nozzles have significant technical defects: because the nozzle is usually designed with a rotating structure (or the rotation effect is caused by gas flow), the plasma is prone to uneven concentration and temperature distribution under the action of centrifugal force. The edge area of ​​the nozzle jet cavity, especially the small orifice, is subject to local high temperature erosion for a long time due to the high degree of plasma accumulation and large temperature gradient, resulting in different degrees of ablation. Ultimately, this leads to a shortened nozzle life and a decrease in plasma jet stability, which seriously affects the uniformity and reliability of industrial processing. Utility Model Content

[0004] This invention proposes a nozzle for an atmospheric pressure jet plasma spray gun, which designs the large orifice as an eccentric orifice to increase the distance between the large orifice and the small orifice at the edge that is easily ablated, thereby balancing the ablation rate in different areas of the nozzle and solving the problem of short lifespan caused by local high-temperature erosion.

[0005] The technical solution of this utility model is implemented as follows: A nozzle of an atmospheric pressure jet plasma spray gun includes a nozzle body, an inclined jet cavity is provided on the nozzle body, a large hole is provided at the outlet end of the jet cavity, a ring of small holes is arranged outside the large hole, the ring of small holes is centered on the axis of the jet cavity, the large hole is an eccentric hole, the axis of the large hole is parallel to the axis of the jet cavity, the axis of the large hole is deviated from the axis of the jet cavity, and is located on the side of the jet cavity axis close to the edge of the nozzle body.

[0006] Furthermore, the intersection of the large orifice axis and the nozzle body end face is point A, and the intersection of the jet cavity axis and the nozzle body end face is point B. Point A is located on the side of point B near the edge of the nozzle body, and the distance L between points A and B is 1-2 mm.

[0007] Furthermore, the projection line of the axis of the jet cavity onto the end face of the nozzle body is line C, the line connecting point A and point B is line D, and the included angle α between line C and line D is 70-75°.

[0008] Furthermore, the angle β between the axis of the large orifice and the end face of the nozzle body is 50-55°.

[0009] The beneficial effects of this utility model are: The original nozzle had a central orifice, which was coaxial with the jet cavity. This invention redesigns the nozzle's central orifice as an eccentric orifice, with the axis of the central orifice offset from the axis of the jet cavity. This creates an eccentric structure between the central orifice and the easily ablated small orifices at the edges, increasing the distance between them. This causes the high-temperature plasma region, which was originally concentrated in the small orifices at the edges due to rotational effects or airflow disturbances, to be spatially misaligned with the central orifice, balancing the ablation rate in each region and solving the problem of inconsistent lifespan caused by localized high-temperature erosion. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a 3D view of the nozzle; Figure 2 This is the front view of the nozzle; Figure 3 This is a top view of the nozzle; Figure 4 for Figure 3 Sectional view of EE; Figure 5 This is a bottom view of the nozzle; Figure 6 for Figure 5 This is a sectional view of FF; Figure 7 for Figure 5 A magnified view of a portion of G.

[0012] Nozzle body 1, jet chamber 2, large orifice 3, small orifice 4, large orifice axis 5, jet chamber axis 6. Detailed Implementation

[0013] 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.

[0014] like Figure 1-4As shown, a nozzle of an atmospheric pressure jet plasma spray gun includes a nozzle body 1. An inclined jet cavity 2 is provided on the nozzle body 1. A large hole 3 is provided at the outlet end of the jet cavity 2. A ring of small holes 4 is arranged on the outer side of the large hole 3. The ring of small holes 4 is centered on the jet cavity axis 6, which is the central axis of the jet cavity 2. The large hole 3 is an eccentric hole. The axis 5 of the large hole is parallel to the jet cavity axis 6 and is the central axis of the large hole 3. The angle β between the axis 5 of the large hole and the end face of the nozzle body 1 is 50-55°. The axis 5 of the large hole is offset from the jet cavity axis 6 and is located on the side of the jet cavity axis 6 closer to the edge of the nozzle body 1.

[0015] like Figure 4-7 As shown, the intersection of the large hole axis 5 and the end face of the nozzle body 1 is point A, and the intersection of the jet cavity axis 6 and the end face of the nozzle body 1 is point B. Point A is located on the side of point B that is close to the edge of the nozzle body 1, and the distance L between points A and B is 1-2 mm.

[0016] The projection line of the jet cavity axis 6 onto the end face of the nozzle body 1 is line C, the line connecting point A and point B is line D, and the included angle α between line C and line D is 70-75°.

[0017] 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, improvements, etc., 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. A nozzle for an atmospheric pressure effusive plasma torch comprising a nozzle body having an oblique effusive cavity formed therein, characterized in that: The outlet end of the jet cavity is provided with a large hole, and a ring of small holes are arranged on the outside of the large hole. The ring of small holes is centered on the axis of the jet cavity. The large hole is an eccentric hole. The axis of the large hole is parallel to the axis of the jet cavity, but it is offset from the axis of the jet cavity and is located on the side of the jet cavity axis closer to the edge of the nozzle body.

2. A nozzle for an atmospheric pressure effusive plasma torch according to claim 1, characterized in that: Point A is the intersection of the axis of the large orifice and the end face of the nozzle body, and point B is the intersection of the axis of the jet cavity and the end face of the nozzle body. Point A is located on the side of point B that is close to the edge of the nozzle body, and the distance L between points A and B is 1-2 mm.

3. A nozzle for an atmospheric pressure effusive plasma torch according to claim 2, characterized in that: The projection line of the jet cavity axis onto the nozzle body end face is line C, the line connecting point A and point B is line D, and the included angle α between line C and line D is 70-75°.

4. A nozzle for an atmospheric pressure effusive plasma torch according to any one of claims 1 to 3, characterized in that: The angle β between the axis of the large orifice and the end face of the nozzle body is 50-55°.

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