Aero-engine tail nozzle noise reduction device convenient to replace

Abstract

The utility model relates to the technical field of noise reduction devices, in particular to an aero-engine tail nozzle noise reduction device convenient to replace, which comprises an engine body, a sawtooth-shaped tail nozzle, a portable positioning mechanism and a fastening anti-falling mechanism. When the aero-engine tail nozzle noise reduction device convenient to replace is used, the positioning T-shaped strip and the positioning T-shaped groove assembly are arranged on the side edge of the sawtooth-shaped tail nozzle; when the sawtooth-shaped exhaust nozzle is installed, the positioning T-shaped groove assembly on the side edge of the sawtooth-shaped exhaust nozzle is directly installed outside the positioning T-shaped strip on the side edge of the engine body in an aligned mode, so that the positioning procedure is completed, and workers do not need to carefully align and adjust the assembly. Meanwhile, by means of the alignment installation mode of the positioning T-shaped strip and the positioning T-shaped groove assembly, the auxiliary supporting and stabilizing effect can be achieved on the connecting end of the aero-engine and the sawtooth-shaped exhaust nozzle, and the problem of deviation cannot happen easily due to the limiting effect in the installation process.

Description

TECHNICAL FIELD

[0001] The utility model relates to noise reduction device technical field, especially a kind of aviation engine tail nozzle noise reduction device of convenient replacement. BACKGROUND

[0002] Aviation engine tail nozzle noise reduction device is a kind of object for reducing the noise generated in the operation process of aviation engine, and serrated nozzle is a commonly used noise reduction device, serrated nozzle can effectively disrupt the order and arrangement of airflow, reduce the formation of vortex, thereby reducing engine exhaust noise, and by changing the structure of airflow, reduce high-frequency noise and improve the radiation characteristics of low-frequency noise, while serrated design helps to improve the mixing efficiency of jet airflow and surrounding air, this improved mixing can lead to more efficient combustion and reduce airflow impact noise.

[0003] The existing serrated nozzle needs manual adjustment when installing to the side of aviation engine, and subsequent manual support is required to perform fastening installation process, so the overall operation process is relatively cumbersome, not easy to disassemble and replace, so a serrated nozzle convenient to replace and install is required. SUMMARY

[0004] The utility model discloses a kind of aviation engine tail nozzle noise reduction devices of convenient replacement, improve the existing serrated nozzle when installing to the side of aviation engine due to not being set relevant alignment component, when installing, it needs manual adjustment alignment, subsequent manual support is required to perform fastening installation process, the overall operation process is relatively cumbersome, not easy to disassemble and replace problem.

[0005] A kind of aviation engine tail nozzle noise reduction device of convenient replacement, including engine body, serrated nozzle, portable positioning mechanism and fastening anti-unhooking mechanism: the engine body is located in the side of serrated nozzle;

[0006] The portable positioning mechanism includes positioning support ring, positioning T-shaped strip, butt joint mounting ring and positioning T-shaped slot, the positioning support ring is welded and installed with the shell side wall of engine body in exhaust end position, the side edge outer wall of the positioning support ring is provided with positioning T-shaped strip in equal interval around, the side edge outer wall of serrated nozzle in air inlet end position is welded and installed with butt joint mounting ring, the side edge inner wall of the butt joint mounting ring is provided with positioning T-shaped slot in equal interval, the positioning T-shaped strip and positioning T-shaped slot are slidably installed.

[0007] Preferably, the fastening anti-off mechanism comprises positioning columns and an auxiliary support ring, the positioning columns are circumferentially distributed and mounted on the gas outlet end shell side wall of the engine body, the mounting position of the positioning support ring is close to the inner ring of the shell of the engine body, the mounting position of the positioning column is close to the outer ring of the shell of the engine body, and the auxiliary support ring is welded and mounted on the outside of the butt joint mounting ring.

[0008] Preferably, the side edge outer wall of the auxiliary support ring is provided with a through hole for plug-in connection with the positioning column, the side edge outer wall of the positioning column is provided with a threaded mounting groove, the side edge of the auxiliary support ring is provided with a fastening bolt for opposite mounting with the threaded mounting groove, and the fastening bolt and the threaded mounting groove are in threaded mounting.

[0009] Preferably, two groups of wedge-shaped washers are superimposed and mounted on the outside of the fastening bolt.

[0010] Preferably, one side of the wedge-shaped washer is provided with a wedge-shaped ruler structure, and the other side is provided with a radial fine tooth structure.

[0011] Preferably, the outside of the serrated tail nozzle is coated with a ceramic coating through a chemical adhesive.

[0012] The beneficial effects of the utility model are:

[0013] 1. The aviation engine tail nozzle noise reduction device convenient to replace in use, through the design of the positioning T-shaped strip and the positioning T-shaped groove assembly arranged on the side edge of the serrated tail nozzle, the positioning process is completed by directly oppositely mounting the positioning T-shaped groove assembly on the side edge of the serrated tail nozzle to the outside of the positioning T-shaped strip on the side edge of the engine body, without the need for the staff to carefully oppositely adjust the assembly, and the oppositely mounting mode of the positioning T-shaped strip and the positioning T-shaped groove assembly can also play the effect of auxiliary support and stability on the connection end of the aviation engine and the serrated tail nozzle, so that the aviation engine and the serrated tail nozzle cannot easily deviate in the installation process due to the limiting effect, the overall structure design is simple, and the practical effect is good.

[0014] 2. The aviation engine tail nozzle noise reduction device convenient to replace in use, through the design of the wedge-shaped washer arranged on the side edge of the bolt assembly for auxiliary mounting, the connection is realized through the wedge-shaped principle, the locking effect is realized through the friction force and the mechanical structure, so that the bolt cannot easily loosen when subjected to vibration or external force, further guaranteeing the connection tightness and stability between the aviation engine and the serrated tail nozzle on the basis of guaranteeing the stable mounting of the bolt assembly, the overall structure design is simple, and the practical effect is good. ACCURACY OF DRAWINGS

[0015] Figure 1 It is a whole three-dimensional structure schematic view of the utility model;

[0016] Figure 2 This is a schematic diagram of the three-dimensional structure of the portable positioning mechanism of the present utility model;

[0017] Figure 3 This is a schematic diagram of the three-dimensional structure of the fastening and anti-slipping mechanism of the present invention;

[0018] Figure 4 For the utility model Figure 3 A in the middle is an enlarged schematic diagram of the three-dimensional structure;

[0019] Figure 5 It is a schematic diagram of the three-dimensional structure of the wedge-shaped washer of the present utility model.

[0020] In the figure: 1. Engine body; 2. Serrated tail nozzle; 3. Portable positioning mechanism; 31. Positioning support ring; 32. Positioning T-bar; 33. Docking mounting ring; 34. Positioning T-slot; 4. Fastening and anti-slip mechanism; 41. Positioning column; 42. Auxiliary support ring; 43. Through hole; 44. Fastening bolt; 45. Wedge washer; 51. Ceramic coating. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0022] When implementing: Figures 1-5 As shown, an easily replaceable aircraft engine tail nozzle noise reduction device includes an engine body 1, a serrated tail nozzle 2, a portable positioning mechanism 3, and a fastening and anti-slip mechanism 4: the engine body 1 is located on the side of the serrated tail nozzle 2;

[0023] The portable positioning mechanism 3 includes a positioning support ring 31, a positioning T-shaped bar 32, a docking mounting ring 33 and a positioning T-shaped slot 34. The positioning support ring 31 is welded to the side wall of the shell of the engine body 1 at the exhaust end. The positioning T-shaped bars 32 are arranged around the side outer wall of the positioning support ring 31 at equal intervals. The docking mounting ring 33 is welded to the side outer wall of the serrated tail nozzle 2 at the intake end. The side inner wall of the docking mounting ring 33 is provided with positioning T-shaped slots 34 at corresponding equal intervals. The positioning T-shaped bars 32 and the positioning T-shaped slots 34 are slidably mounted.

[0024] When the serrated tail nozzle 2 needs to be installed to the side of the engine body 1, at this time first need to adjust the serrated tail nozzle 2 to the appropriate position and then push the positioning T-shaped groove 34 on the side of the serrated tail nozzle 2 to the outside of the positioning T-shaped strip 32, when the positioning T-shaped strip 32 moves to the bottom end of the positioning T-shaped groove 34, at this time the auxiliary support ring 42 just covers the positioning support ring 31 completely, and provides the effect of basic positioning support for the subsequent fastening and installation process.

[0025] The fastening anti-loose mechanism 4 includes a positioning column 41 and an auxiliary support ring 42, the positioning column 41 is circumferentially distributed and installed on the gas outlet end shell side wall of the engine body 1, the installation position of the positioning support ring 31 is close to the inner ring of the shell of the engine body 1, the installation position of the positioning column 41 is close to the outer ring of the shell of the engine body 1, the auxiliary support ring 42 is welded and installed on the outside of the butt joint installation ring 33, the side outer wall of the auxiliary support ring 42 is throughly provided with a through hole 43 connected with the positioning column 41, the side outer wall of the positioning column 41 is provided with a threaded installation groove, and the side of the auxiliary support ring 42 is provided with a fastening bolt 44 installed in position with the threaded installation groove, and the fastening bolt 44 and the threaded installation groove are screwed, and two groups of wedge-shaped washers 45 are stacked on the outside of the fastening bolt 44, one side of the wedge-shaped washer 45 is provided with a wedge-shaped ruler surface structure, and the other side is provided with a radial fine tooth structure;

[0026] When the serrated tail nozzle 2 is positioned in the above-mentioned positioning process, the positioning column 41 will enter the inside of the through hole 43, then the two groups of wedge-shaped washers 45 are sleeved to the outside of the fastening bolt 44 and the fastening bolt 44 is inserted into the through hole 43 and screwed into the threaded installation groove inside the positioning column 41, when tightened, the radial fine teeth on the wedge-shaped washer 45 increase the friction factor of the contact surface, and the wedge-shaped teeth are locked, because the included angle between the wedge-shaped tooth surfaces of the washer is greater than the thread angle, when unscrewing occurs, the thickness of the washer in the axial direction is greater than the amount of thread climbing in the axial direction, thereby increasing the axial pre-tightening force of the fastening bolt 44, effectively preventing the loosening of the fastening bolt 44 caused by airflow vibration, thereby achieving the effect of tightening and anti-loose.

[0027] The outside of the serrated tail nozzle 2 is coated with a ceramic coating 51 by chemical adhesive; here the ceramic coating 51 has good high temperature resistance, can protect the serrated tail nozzle 2 from the direct influence of high temperature gas, and helps to prolong the service life of the serrated tail nozzle 2, and the specific coating method is operated according to the existing technical standard.

[0028] The utility model discloses when using, when need to install the serrated tail nozzle 2 to the side of engine body 1, first need to adjust the serrated tail nozzle 2 suitable position after its side positioning T -shaped groove 34 is opposite and pushes to the outside of positioning T -shaped strip 32 when this time, when positioning T -shaped strip 32 moves to the bottom end of positioning T -shaped groove 34, this time auxiliary support ring 42 just completely covers positioning support ring 31, and this provides the effect of basic positioning support for subsequent fastening installation procedure,

[0029] When the serrated tail nozzle 2 is in the alignment procedure, the positioning column 41 will follow into the inside of the through hole 43, then two groups of wedge washers 45 are sleeved to the outside of the fastening bolt 44, and the fastening bolt 44 is passed into the through hole 43 and is screwed to the threaded installation groove inside the positioning column 41, when tightening, the radial fine teeth on the wedge washer 45 can increase the friction factor of the contact surface, and the wedge teeth are locked, since the included angle between the washer wedge tooth surfaces is greater than the thread rise angle, when unscrewing occurs, the amount of axial thickening of the washer is greater than the amount of axial climbing of the thread, thereby increasing the axial pre-tightening force of the fastening bolt 44, effectively preventing the loosening of the fastening bolt 44 due to airflow vibration, and further realizing the effect of tightening and anti-loosening.

[0030] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that those skilled in the art can understand.

Claims

1. An aircraft engine exhaust nozzle noise reduction device that facilitates replacement, characterized by, Including engine body (1), serrated tail nozzle (2), portable positioning mechanism (3) and fastening anti-off mechanism (4): the engine body (1) is located in the side of serrated tail nozzle (2); The portable positioning mechanism (3) comprises a positioning support ring (31), a positioning T-shaped strip (32), a butt joint mounting ring (33) and a positioning T-shaped groove (34), the positioning support ring (31) is welded and mounted on the shell side wall of the engine body (1) at the exhaust end position, the side outer wall of the positioning support ring (31) is provided with the positioning T-shaped strip (32) at equal intervals in a surrounding manner, the serrated tail nozzle (2) is welded and mounted on the side outer wall at the air inlet end position, the side inner wall of the butt joint mounting ring (33) is provided with the positioning T-shaped groove (34) at equal intervals, and the positioning T-shaped strip (32) and the positioning T-shaped groove (34) are slidably mounted.

2. The replaceable noise-reducing device for an aircraft engine exhaust nozzle of claim 1, wherein: The fastening anti-off mechanism (4) comprises a positioning column (41) and an auxiliary support ring (42), the positioning column (41) is circumferentially distributed and mounted on the exhaust end shell side wall of the engine body (1), the mounting position of the positioning support ring (31) is close to the inner ring of the shell of the engine body (1), the mounting position of the positioning column (41) is close to the outer ring of the shell of the engine body (1), and the auxiliary support ring (42) is welded and mounted on the outside of the butt joint mounting ring (33).

3. A replaceable noise-reducing device for an aircraft engine exhaust nozzle as defined in claim 2, wherein: The side outer wall of the auxiliary support ring (42) is provided with a through hole (43) connected with the positioning column (41) in plug connection, the side outer wall of the positioning column (41) is provided with a threaded mounting groove, the side of the auxiliary support ring (42) is provided with a fastening bolt (44) mounted in position with the threaded mounting groove, and the fastening bolt (44) and the threaded mounting groove are threadedly mounted.

4. The replaceable exhaust nozzle noise-reduction device for an aircraft engine of claim 3, wherein: Two groups of wedge-shaped washers (45) are mounted on the outside of the fastening bolt (44).

5. A replaceable noise-reducing device for an aircraft engine exhaust nozzle according to claim 4, wherein: One side of the wedge-shaped washer (45) is provided with a wedge-shaped ruler structure, and the other side is provided with a radial fine tooth structure.

6. The replaceable noise-reducing exhaust nozzle assembly of claim 1, wherein: The outside of the serrated tail nozzle (2) is coated with a ceramic coating (51) by a chemical adhesive.

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