Sand blasting gun

Abstract

The invention provides a sand blasting gun which comprises a gun barrel, a nozzle is arranged at the lower end of the gun barrel, the nozzle is provided with a contraction part, a throat part, a flat expansion part and a wave-shaped part which are sequentially arranged and integrally formed, an inner cavity of the wave-shaped part is of a wave-shaped structure, and the direction of the bottom of the inner cavity of the wave-shaped part is the same as that of an inner cavity of the flat expansion part. By adopting the sand blasting gun disclosed by the invention, not only can the consistency of linear erosion areas be accurately controlled, but also the problem that the erosion fluid sprayed from the nozzle is extremely easy to drift is solved, the erosion test efficiency is favorably improved, and meanwhile, a plurality of point-shaped erosion tests can be synchronously carried out.

Description

Technical Field

[0001] The invention relates to erosion test equipment, in particular to a sandblasting gun of the erosion test equipment. Background Art

[0002] When aircraft engines operate in a dusty environment, dust erosion is the most common type of wear, which is a type of gas-solid erosion wear. When dust is carried into the engine by high-speed airflow, dust erosion will cause irreversible damage to aircraft performance. Dust erosion in harsh environments such as deserts is more damaging to the engine. In order to better adapt to the technological development in the field of aircraft engines, it is necessary to carry out high-speed dust continuous erosion tests.

[0003] As one of the key components of the erosion test equipment, the sandblasting gun is used to spray the erosion fluid at high speed when in working state. Section 2.3 of the existing document "Study on the Test Method and Damage Law of TC4 Flat Plate Subjected to Sand and Dust High-Speed ​​Erosion, Ma Songlin" discloses a high-speed sandblasting gun, including an acceleration tube, a Laval tube and an expansion tube connected in sequence. Although the sandblasting gun can increase the airflow outlet velocity of the Laval tube to 600m / s, it is only suitable for point erosion. If it is used for surface erosion test, there is a problem of very low test efficiency.

[0004] Experiments show that a spray gun with a flat nozzle can convert point erosion into linear erosion and thus improve test efficiency. However, its biggest problem is that it cannot accurately control the consistency of the linear erosion area, and the erosion fluid sprayed from the flat nozzle is very easy to drift. Summary of the invention

[0005] In order to at least solve the technical problems mentioned in the background technology, the present invention provides a sandblasting gun.

[0006] The present invention adopts the following technical solution.

[0007] A sandblasting gun comprises a gun barrel, wherein a nozzle is arranged at the lower end of the gun barrel, wherein the nozzle comprises a contraction portion, a throat portion, a flat expansion portion and a corrugated portion which are arranged in sequence and integrally formed, wherein the inner cavity of the corrugated portion is in a corrugated structure, and the bottom of the inner cavity of the corrugated portion faces the same direction as the inner cavity of the flat expansion portion.

[0008] As a preferred solution, the inner cavity gap width of the corrugated portion is 2 mm.

[0009] Furthermore, the inner cavity of the corrugated portion has a plurality of partitions, and the channel aperture between adjacent partitions is 2 mm. With such a solution, multiple point erosions can be carried out at one time.

[0010] Furthermore, the gun barrel is installed in a barrel seat.

[0011] Furthermore, the gun barrel has a Laval tube section.

[0012] As a preferred solution, the corrugated portion is in an overall rectangular structure.

[0013] Furthermore, the inner cavity of the joint of the nozzle has a second contraction portion, a second throat portion, and a second expansion portion which are arranged in sequence.

[0014] Beneficial effect: The sandblasting gun of the present invention can not only accurately control the consistency of the linear erosion area, but also solve the problem that the erosion fluid sprayed from the middle area of ​​the nozzle is very easy to drift, and effectively avoids the erosion particles at the corners of the nozzle from drifting outward, which is beneficial to improving the efficiency of the erosion test, and can simultaneously carry out multiple point erosion tests. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional schematic diagram of the nozzle of the sandblasting gun in Example 1; Figure 2 Schematic diagram of the main direction of the nozzle of the sandblasting gun in Example 1; Figure 3 Schematic diagram of the nozzle side of the sandblasting gun in Example 1; Figure 4 is the nozzle profile of the sandblasting gun in Example 1 ( Figure 2 AA direction) schematic diagram; Figure 5 Schematic diagram of the main direction of the nozzle of the sandblasting gun in Example 2; Figure 6 Schematic diagram of the nozzle cross section of the sandblasting gun in Comparative Example 1; Figure 7 Schematic diagram of the nozzle cross section of the sandblasting gun in Comparative Example 2; Figure 8 Schematic diagram of the test results of the sandblasting gun. DETAILED DESCRIPTION

[0016] The technical solution of the present invention is described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example 1

[0017] Combination Figures 1 to 4As shown, a sandblasting gun includes a barrel, the barrel is installed in a tube seat, the barrel has a Laval tube section, a nozzle 72 is arranged at the lower end of the barrel, the nozzle 72 has a contraction portion 73, a throat portion 74, a flat expansion portion 75 and a corrugated portion 76 arranged in sequence and integrally formed, the inner cavity of the corrugated portion 76 is a corrugated structure, and the bottom of the inner cavity of the corrugated portion 76 faces the same direction as the inner cavity of the flat expansion portion 75. Among them, the inner cavity width of the corrugated portion 76 is 2mm, and the outer portion of the corrugated portion 76 is a rectangular structure as a whole. In this embodiment, the inner cavity of the joint of the nozzle 72 has a second contraction portion 77, a second throat 78, and a second expansion portion 79 arranged in sequence. Example 2

[0018] A sandblasting gun, combined with Figure 5 As shown, it includes a gun barrel, which is installed in a tube seat. The gun barrel has a Laval tube section, and a nozzle 72 is arranged at the lower end of the gun barrel. The nozzle 72 has a contraction portion 73, a throat portion 74, a flat expansion portion 75 and a corrugated portion 76 arranged in sequence and integrally formed. The inner cavity of the corrugated portion 76 is a corrugated structure, and the bottom of the inner cavity of the corrugated portion 76 faces the same direction as the inner cavity of the flat expansion portion 75. Among them, the inner cavity gap width of the corrugated portion 76 is 2mm, and the outer portion of the corrugated portion 76 is a rectangular structure as a whole. The joint inner cavity of the nozzle 72 has a second contraction portion 77, a second throat portion 78, and a second expansion portion 79 arranged in sequence. The inner cavity of the corrugated portion 76 specifically has a plurality of partitions 71, and the channel aperture between adjacent partitions 77 is 2mm.

[0019] Comparative Example 1 Reference Figure 6 As shown, a sandblasting gun includes a barrel, which is installed in a tube seat. The barrel has a Laval tube section. A nozzle 72 is arranged at the lower end of the barrel. The nozzle 72 has a contraction portion 73, a throat portion 74 and a flat extension portion 75 that are arranged in sequence and integrally formed. The specifications of the barrel, the nozzle 72 and the flat extension portion 75 are the same as those in Example 1. The lower end of the flat extension portion 75 has a rectangular portion with the same height as the corrugated portion 76 in Example 1, and the rectangular inner cavity width of the rectangular portion is 2 mm.

[0020] Comparative Example 2 Reference Figure 7 As shown, a sandblasting gun includes a barrel, the barrel is installed in a tube seat, the barrel has a Laval tube section, a nozzle 72 is arranged at the lower end of the barrel, the nozzle 72 has a contraction portion 73, a throat portion 74 and a flat extension portion 75 arranged in sequence and integrally formed, and the specifications of the barrel, the nozzle 72 and the flat extension portion 75 are the same as those of Example 1. The inner cavity of the joint of the nozzle 72 has a second contraction portion 77, a second throat portion 78 and a second extension portion 79 arranged in sequence, and the lower end of the flat extension portion 75 has a rectangular portion with the same height as the corrugated portion 76 in Example 1, and the rectangular inner cavity width of the rectangular portion is 2 mm.

[0021] Performance test: The sandblasting guns in Example 1 and the comparative example are connected to the sandblasting equipment (or erosion equipment) respectively, the erosion particles are sand particles with a particle size of 100-150 mesh, the erosion particle feeding speed is adjusted to 5g / s, and the erosion fluid speed is adjusted to 200±10m / s; then the nozzle of the sandblasting gun is directed to the test plate (0.2mm thick copper foil bonded to the substrate), the distance between the nozzle outlet and the copper foil surface is controlled to be 10mm, and then the sandblasting equipment (or erosion equipment) is turned on. After the end, the depression points on the copper foil are observed and counted. The results are shown in FIG. Figure 8 The frame line in the figure indicates the boundary corresponding to the nozzle outlet. Part (a) in the figure corresponds to the test result of the sandblasting gun in Example 1, part (b) in the figure corresponds to the test result of the sandblasting gun in Comparative Example 1 (after enlargement), and part (c) in the figure corresponds to the test result of the sandblasting gun in Comparative Example 2. Figure 8 It can be seen that when the sandblasting gun in Example 1 is used, the average width of the linear erosion area sprayed is 2.17 mm (the maximum width is 2.22 mm, and the minimum width is 2.12 mm), the consistency of the erosion area in the width direction is good, and only a very small amount of erosion particles drift outside the standard boundary; when the sandblasting gun in Comparative Example 1 is used, the average width of the linear erosion area sprayed is 1.75 mm (the maximum width is 2.21 mm, and the minimum width is 1.29 mm), the consistency of the erosion area in the width direction is poor, the middle part has an obvious narrowing area, and only a large number of erosion particles drift outside the standard boundary; when the sandblasting gun in Comparative Example 2 is used, the average width of the linear erosion area sprayed is 1.75 mm (the maximum width is 2.31 mm, and the minimum width is 1.81 mm), the consistency of the erosion area in the width direction is poor, the middle part has an obvious narrowing area, and only a large number of erosion particles drift outside the standard boundary.

[0022] The sandblasting gun in Example 1 can not only accurately control the consistency of the linear erosion area, but also solve the problem that the erosion fluid ejected from the nozzle is very easy to drift, and effectively prevent the erosion particles at the corners of the nozzle from drifting outward; the sandblasting gun in Example 2 can also carry out multiple point erosion tests simultaneously. The present invention is conducive to improving the efficiency of erosion tests.

Claims

1. A sandblasting gun, comprising a barrel, a nozzle (72) being arranged at the lower end of the barrel, characterized in that: The nozzle (72) comprises a contraction portion (73), a throat portion (74), a flat expansion portion (75) and a corrugated portion (76) which are arranged in sequence and integrally formed; the inner cavity of the corrugated portion (76) is in a corrugated structure; the bottom of the inner cavity of the corrugated portion (76) faces the same direction as the inner cavity of the flat expansion portion (75).

2. The sandblasting gun according to claim 1, characterized in that: The inner cavity gap width of the corrugated portion (76) is 2 mm.

3. The sandblasting gun according to claim 1, characterized in that: The inner cavity of the corrugated portion (76) comprises a plurality of partitions (71), and the channel aperture between adjacent partitions (77) is 2 mm.

4. The sandblasting gun according to any one of claims 1 to 3, characterized in that: The gun barrel (70) is installed in a barrel seat.

5. The sandblasting gun according to claim 4, characterized in that: The barrel has a Laval tube section.

6. The sandblasting gun according to claim 5, characterized in that: The corrugated portion (76) has an overall rectangular structure.

7. The sandblasting gun according to claim 8, characterized in that: The inner cavity of the joint of the nozzle (72) comprises a second contraction portion (77), a second throat portion (78), and a second expansion portion (79) which are arranged in sequence.

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