CN215804843U - Engine air inlet passage structure - Google Patents

Abstract

The utility model belongs to the technical field of aerospace, and particularly relates to an engine air inlet passage structure which comprises an air inlet passage rear section and two air inlet passage inner pipelines distributed in a mirror image mode, wherein the two air inlet passage inner pipelines are fixedly connected with the air inlet passage rear section, one ends of the two air inlet passage inner pipelines far away from the air inlet passage rear section are fixedly sleeved with air inlet passage fairings, one ends of the air inlet passage rear section far away from the air inlet passage inner pipelines are fixedly provided with engine connecting rings, and two dust removing mechanisms are arranged in the air inlet passage inner pipelines. The utility model can be applied to aircrafts with various specifications, mainly reduces the engineering implementation difficulty, has the characteristics of light structure, good stress form, easy manufacture, simple integral installation and fixation, convenient disassembly, stable and flexible structure, short manufacturing period and the like; this is achieved by ensuring the air flow into the engine and also by reducing the frequency of maintenance of the air intake.

Description

Engine air inlet passage structure

Technical Field

The utility model relates to the technical field of aerospace, in particular to an engine air inlet passage structure.

Background

The air inlet channel is an inlet and a channel of air required by the air jet engine, and not only is the air with a certain flow rate supplied to the engine, but also the air inlet flow field ensures the normal work of the air compressor and the combustion chamber. In flight, the air inlet channel needs to realize the speed reduction and pressurization of high-speed air flow and convert the kinetic energy of the air flow into pressure energy. Along with the increase of the flying speed, the supercharging effect of the air inlet channel is larger and larger, and the supercharging effect can greatly exceed that of the air compressor during supersonic flying, so that the supersonic aircraft air inlet channel has an important effect on improving the flying performance. The modern aircraft is characterized by large variation range of flying speed and altitude, and the air inlet channel is ensured in all flight states: the air flow required by the engine has small energy loss, uniform and stable flow field and low external resistance

The structural form of the air inlet channel directly influences the air flow rate and the flow field uniformity, in most cases, the structure of the air inlet channel is a tubular structure with a regular cross section and an irregular line formed by connecting central points of the cross section, and then the air inlet channel structure can bear certain pressure when an aircraft flies, the pressure is related to the flying speed of the aircraft, the air inlet channel structure is convenient to install, has enough tolerance compensation, needs to realize light weight, and meets the conditions, so that the air inlet channel structure is difficult to manufacture in general production;

the existing air inlet can only isolate a part of dust, and the blockage condition is easy to occur when the dust is filtered, so that the air flow rate flowing through the air inlet is slowed, and the air quantity entering the engine in a certain time period is reduced.

Therefore, we propose an engine inlet structure for solving the above problems

Disclosure of Invention

The utility model aims to solve the defects in the prior art and provides an engine air inlet structure.

In order to achieve the purpose, the utility model adopts the following technical scheme: an engine air inlet structure comprises an air inlet rear section and two air inlet inner pipelines distributed in a mirror image manner, wherein the two air inlet inner pipelines are fixedly connected with the air inlet rear section, one ends of the two air inlet inner pipelines far away from the air inlet rear section are fixedly sleeved with air inlet fairings, one ends of the air inlet rear section far away from the air inlet inner pipelines are fixedly provided with engine connecting rings, two dust removing mechanisms are arranged inside the air inlet inner pipelines, each dust removing mechanism comprises an arc-shaped block connected with the inner wall of the air inlet inner pipeline in an interference fit manner, a plurality of air holes distributed in a matrix manner are formed in the arc-shaped block, a filtering mechanism is arranged in each air hole, each filtering mechanism comprises a filtering net connected with the inner wall of each air hole in a sliding manner, one end of each filtering net is rotatably provided with a sweeping mechanism, each sweeping mechanism comprises a paddle and a scraping plate which are fixedly connected together, the scraper blade and the surface of the filter screen are connected together in a sliding manner.

Preferably, the pipeline includes preceding pipeline, well pipeline and back pipeline in the intake duct, preceding pipeline and back pipeline respectively with intake duct radome fairing and intake duct back end fixed connection together, the equal fixed mounting in one end that preceding pipeline and back pipeline and well pipeline are close to each other has the connecting plate, two adjacent connecting plates fixed connection together.

Preferably, the arc-shaped block is fixedly sleeved with a sealing gasket, and the sealing gasket is positioned between two adjacent connecting plates.

Preferably, the filter screen is kept away from to sweep one side fixed mounting who scrapes the mechanism and is had the guide arm, the one end fixed mounting that the filter screen was kept away from to the guide arm has the plectane, sliding sleeve is equipped with the annular piece on the guide arm, fixed mounting has four connecting rods that are circular distribution on the outer wall of annular piece, and the one end that four connecting rods kept away from each other all is in the same place with the inner wall fixed connection of filter screen, one side fixed mounting that annular piece and plectane are close to each other has same straight spring, straight spring sliding sleeve establishes on the guide arm.

Preferably, sweep the drum that scraping the mechanism still including running through the filter screen and being in the same place with filter screen fixed connection, the top fixed mounting of drum has the baffle, run through on the baffle and install the pivot, and pivot and baffle rotate and link together, and the top of pivot and paddle fixed connection are in the same place, the pivot runs through the scraper blade and is in the same place with scraper blade fixed connection, be equipped with nest book spring in the drum, nest book spring rotates the cover and establishes in the pivot, the one end that the spring kept away from the centre of a circle and the inner wall fixed connection of drum are in the same place for nest book, the one end that the spring is close to the centre of a circle and pivot fixed connection are in the same place for nest book.

Preferably, the material of pipeline in the intake duct and intake duct radome fairing is the carbon fiber laminate of thickness 2.5mm, the material of engine connecting ring and intake duct rear end is 7050 aluminum alloy.

Preferably, a latticed protective net is fixedly installed in each of the two air inlet duct fairings.

A method for manufacturing an engine inlet structure, which is used for manufacturing any one of the engine inlet structures, and comprises the following steps:

firstly, coating a release agent on the surface and parting surface of a mold cavity for manufacturing an inner pipeline and an air inlet fairing of an air inlet, starting laying operation after the release agent is volatilized and dried, laying by using carbon fiber prepreg cloth, and then sequentially laying an isolation film and glue absorption cotton;

secondly, putting the mould into a vacuum bag for vacuumizing, finally putting the mould into an oven for curing, and after curing is finished, releasing the pipeline in the air inlet channel and the air inlet channel fairing from the corresponding mould;

thirdly, two adjacent connecting plates are fixedly connected together through screws among the front pipeline, the middle pipeline and the rear pipeline on the inner pipeline of the air inlet channel;

and fourthly, the engine connecting ring and the rear section of the air inlet channel are both machined and manufactured by adopting an aluminum alloy machine, and the engine connecting ring and the rear section of the air inlet channel are both fixedly connected with the pipeline in the air inlet channel by adopting countersunk rivets.

Compared with the prior art, the utility model has the beneficial effects that:

1. the air inlet is designed into a sectional structure, so that the air inlet is convenient to disassemble, assemble, maintain and repair, the engineering implementation difficulty is greatly reduced, and the rigidity and the strength of the air inlet are improved. The air inlet channel is particularly suitable for the condition that the air inlet channel with irregular axis cannot be formed, and the air inlet channel is made of conventional materials and fasteners, so that the manufacturing period is short, and the air inlet channel is convenient to manufacture and purchase; the air inlet structure is flexible. The structure can be adjusted according to air inlet channels with different sizes and different types;

2. according to the utility model, the two dust removing mechanisms are arranged in the pipeline in the air inlet channel, so that dust in air flowing through the pipeline in the air inlet channel can be filtered, and meanwhile, the dust removing mechanisms can be self-cleaned through the sweeping and scraping mechanisms, so that the situation that the dust removing mechanisms are blocked is avoided, and the time for maintaining the air inlet channel is shortened.

Drawings

FIG. 1 is a schematic diagram of an overall structure of an engine intake structure according to the present invention;

FIG. 2 is a schematic diagram of an elevation structure of an air inlet structure of an engine according to the present invention;

FIG. 3 is an exploded view of an intake duct in an intake duct structure of an engine according to the present invention;

FIG. 4 is a schematic diagram of the overall and partial structure of a dust removing mechanism in an air inlet duct structure of an engine according to the present invention;

FIG. 5 is a schematic diagram of an overall structure of a filter mechanism in an intake duct structure of an engine according to the present invention;

fig. 6 is an exploded view of a sweeping mechanism in an engine intake duct structure according to the present invention.

In the figure: 1. an engine connecting ring; 2. a rear section of the air inlet channel; 3. an in-intake duct; 31. a front duct; 32. a middle pipeline; 33. a rear duct; 4. an inlet duct cowling; 5. a dust removal mechanism; 51. an arc-shaped block; 52. a gasket; 53. air holes are formed; 54. a filtering mechanism; 541. a circular plate; 542. a guide bar; 543. a filter screen; 544. a ring block; 545. a connecting rod; 546. a straight spring; 6. a connecting plate; 7. a sweeping and scraping mechanism; 71. a cylinder; 72. a rotating shaft; 73. a partition plate; 74. a squeegee; 75. a coil spring; 76. a blade.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Examples

Referring to fig. 1-5, the present embodiment provides an engine intake duct structure, which includes an intake duct rear section 2 and two intake duct inner ducts 3 distributed in a mirror image manner, wherein the two intake duct inner ducts 3 are both fixedly connected to the intake duct rear section 2, one ends of the two intake duct inner ducts 3 far away from the intake duct rear section 2 are both fixedly sleeved with an intake duct cowling 4, one end of the intake duct rear section 2 far away from the intake duct inner duct 3 is fixedly mounted with an engine connecting ring 1, two dust removing mechanisms 5 are disposed inside the intake duct inner duct 3, the dust removing mechanisms 5 include arc-shaped blocks 51 connected to inner walls of the intake duct inner ducts 3 in an interference fit manner, a plurality of air vents 53 distributed in a matrix manner are disposed on the arc-shaped blocks 51, filtering mechanisms 54 are disposed in the air vents 53, the filtering mechanisms 54 include filtering nets 543 slidably connected to inner walls of the air vents 53, one ends of the filtering nets 543 are rotatably mounted with scraping mechanisms 7, the wiping mechanism 7 comprises a paddle 76 and a scraper 74 fixedly connected together, and the scraper 74 and the surface of the filter screen 543 are slidably connected together.

In operation, the air will pass through two dust removal mechanisms 5 after passing through in the intake duct interior conduit 3, dust removal mechanism 5 can play the filtration operation to the air, can completely cut off the most dust in the air, can the gliding filter screen 543 shake under the pressure that does not receive the air current, can shake off the dust on the filter screen 543, under the effect of air current, paddle 76 will be driven and rotate, paddle 76 drives scraper 74 through pivot 72 and rotates, scraper 74 can sweep the surface of filter screen 543 in the pivoted in-process, thereby can avoid the condition that the jam appears in filter screen 543, and follow the shake that straight spring 546 drove straight spring 546, thereby can shake off the dust of sweeping off, thereby ensure that the filter screen 543 can not appear blockking up and can keep better filtering performance all the time.

The air inlet inner pipeline 3 comprises a front pipeline 31, a middle pipeline 32 and a rear pipeline 33, the front pipeline 31 and the rear pipeline 33 are respectively and fixedly connected with the air inlet fairing 4 and the air inlet rear section 2, the ends, close to the middle pipeline 32, of the front pipeline 31 and the rear pipeline 33 are respectively and fixedly provided with a connecting plate 6, and the two adjacent connecting plates 6 are fixedly connected together; preceding pipeline 31, well pipeline 32 and back pipeline 33 and corresponding connecting plate 6 all are integrated into one piece and make, not only conveniently connect preceding pipeline 31, well pipeline 32 and back pipeline 33, have also improved the intensity of preceding pipeline 31, well pipeline 32 and back pipeline 33 simultaneously.

The arc-shaped block 51 is fixedly sleeved with a sealing gasket 52, and the sealing gasket 52 is positioned between two adjacent connecting plates 6; the arc sealing gasket 52 can avoid the arc blocks 51 from completely entering the middle pipeline 32, so that the whole dust removing mechanism 5 can be conveniently maintained, and meanwhile, the sealing gasket 52 can play a sealing role between the two connecting plates 6.

A guide rod 542 is fixedly installed on one side of the filter screen 543, which is far away from the scraping mechanism 7, a circular plate 541 is fixedly installed at one end of the guide rod 542, which is far away from the filter screen 543, an annular block 544 is slidably sleeved on the guide rod 542, four connecting rods 545 which are circularly distributed are fixedly installed on the outer wall of the annular block 544, one ends, which are far away from each other, of the four connecting rods 545 are fixedly connected with the inner wall of the filter screen 543, one side, which is close to each other, of the annular block 544 and the circular plate 541 is fixedly installed with a same straight spring 546, and the straight spring 546 is slidably sleeved on the guide rod 542; the straight spring 546 can drive the filter screen 543 to shake when no airflow passes through, so that dust on the filter screen 543 can be shaken off.

The sweeping and scraping mechanism 7 further comprises a cylinder 71 which penetrates through the filter screen 543 and is fixedly connected with the filter screen 543, a partition 73 is fixedly mounted at the top of the cylinder 71, a rotating shaft 72 is mounted on the partition 73 in a penetrating manner, the rotating shaft 72 is rotatably connected with the partition 73, the top end of the rotating shaft 72 is fixedly connected with the paddle 76, the rotating shaft 72 penetrates through the scraper 74 and is fixedly connected with the scraper 74, a socket coil spring 75 is arranged in the cylinder 71, the socket coil spring 75 is rotatably sleeved on the rotating shaft 72, one end of the socket coil spring 75, which is far away from the circle center, is fixedly connected with the inner wall of the cylinder 71, and one end of the socket coil spring 75, which is close to the circle center, is fixedly connected with the rotating shaft 72; the paddle 76 on the scraping mechanism 7 can rotate along with the air flow and drive the scraper 74 to rotate, so that the filtering net 543 can be scraped, and the blocking of the filtering net 543 can be avoided.

The material of the air inlet inner pipeline 3 and the air inlet fairing 4 is a carbon fiber laminated plate with the thickness of 2.5mm, and the material of the engine connecting ring 1 and the material of the air inlet rear section 2 are 7050 aluminum alloy; the carbon fiber laminated plate has the advantages of high carbon strength and rigidity, small density and the like, the aluminum alloy has the advantages of light weight, high strength, easiness in processing and the like, and the carbon fiber laminated plate and the aluminum alloy both have the advantages of simple forming process, short manufacturing period, simplicity in mounting and fixing and the like.

A latticed protective net is fixedly arranged in each of the two air inlet duct fairings 4; the latticed protective net can prevent larger foreign matters similar to birds from entering the air inlet fairing 4, so that the whole device can normally work.

A method for manufacturing an engine inlet structure, which is used for manufacturing the engine inlet structure, and comprises the following steps:

firstly, coating a release agent on the surface and parting surface of a mold cavity for manufacturing an inner pipeline 3 and an air inlet fairing 4 of an air inlet, starting a layering operation after the release agent is volatilized and dried, and sequentially laying an isolation film and a glue absorption cotton after carbon fiber prepreg cloth is laid;

secondly, putting the mould into a vacuum bag for vacuumizing, finally putting the mould into an oven for curing, and after curing is finished, removing the pipeline 3 in the air inlet channel and the air inlet channel fairing 4 from the corresponding mould;

thirdly, two adjacent connecting plates 6 are fixedly connected together through screws among the front pipeline 31, the middle pipeline 32 and the rear pipeline 33 on the air inlet channel inner pipeline 3;

and fourthly, the engine connecting ring 1 and the air inlet rear section 2 are both machined and manufactured by adopting an aluminum alloy machine, and the engine connecting ring 1 and the air inlet rear section 2 are both fixedly connected with the air inlet inner pipeline 3 by adopting countersunk rivets.

In this embodiment, the outside air firstly enters the two air inlet duct fairings 4, then flows into the air inlet duct rear section 2 through the two air inlet duct inner ducts 3, and finally enters the engine, the air is filtered by the two dust removing mechanisms 5 when flowing through the air inlet duct inner ducts 3, so that most of dust in the air can be isolated, and cleanness of the air entering the engine is ensured, the air firstly enters the plurality of air holes 53 and is firstly contacted with the filter screen 543 when flowing into the dust removing mechanisms 5, under the pushing pressure of wind, the filter screen 543 slides in the air holes 53 and stretches the straight spring 546 through the matching of the guide rod 541 and the circular plate, and after the air does not flow into the air inlet duct inner duct 3, the filter screen 543 is not pressurized any more, at this time, the originally stretched straight spring 546 is rapidly reset, so that the filter screen 543 is reset by the circular plate 541 and the guide rod 542, in the process, the filter screen 543 shakes violently, so that the dust on the filter screen 543 can be shaken off.

In this embodiment, when the air flows through the air holes 53, the paddle 76 is driven to rotate under the action of the air flow, the paddle 76 drives the scraper 74 to rotate through the rotating shaft 72, the scraper 74 can sweep the surface of the filter screen 543 during the rotation process, so as to avoid the blockage of the filter screen 543, the socket coil spring 75 is wound during the rotation of the rotating shaft 72, and after the socket coil spring 75 is completely tightened, the rotating shaft 72 does not drive the paddle 76 to rotate, when no air flows through the filter screen 543, the spring 75 will reset and drive the shaft 72 to rotate in the opposite direction, thereby driving the scraper 74 to sweep the filter screen 543 for the second time, so that the dust blocking the filter screen 543 is loosened, and the straight spring 546 is driven to shake along with the straight spring 546, therefore, the swept dust can be shaken off, so that the filter screen 543 is not blocked and better filtering performance can be always kept.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (7)

1. The utility model provides an engine air inlet passage structure, includes air inlet passage back end (2) and two mirror image distribution's air inlet passage interior conduit (3), its characterized in that, two air inlet passage interior conduit (3) all with air inlet passage back end (2) fixed connection together, two the one end that air inlet passage back end (2) were kept away from to air inlet passage interior conduit (3) all fixed cover is equipped with air inlet passage radome fairing (4), the one end fixed mounting that air inlet passage interior conduit (3) were kept away from to air inlet passage back end (2) has engine go-between (1), the inside of air inlet passage interior conduit (3) is equipped with two dust removal mechanism (5), dust removal mechanism (5) include with air inlet passage interior conduit (3) inner wall interference fit link together arc piece (51), set up bleeder vent (53) that a plurality of matrix distributions on arc piece (51), be equipped with filtering mechanism (54) in bleeder vent (53), filtering mechanism (54) include with bleeder vent (53) inner wall sliding connection filter screen (543) together, the one end of filter screen (543) is rotated and is installed to sweep and scrape mechanism (7), sweep paddle (76) and scraper blade (74) that mechanism (7) includes fixed connection together, the surperficial sliding connection of scraper blade (74) and filter screen (543) is in the same place.

2. The engine intake duct structure of claim 1, characterized in that the intake duct inner duct (3) includes a front duct (31), a middle duct (32) and a rear duct (33), the front duct (31) and the rear duct (33) are respectively and fixedly connected with the intake duct fairing (4) and the intake duct rear section (2), the ends of the front duct (31) and the rear duct (33) close to the middle duct (32) are respectively and fixedly provided with a connecting plate (6), and two adjacent connecting plates (6) are fixedly connected together.

3. The engine intake duct structure according to claim 1, wherein the curved blocks (51) are fixedly sleeved with sealing gaskets (52), and the sealing gaskets (52) are located between two adjacent connecting plates (6).

4. The engine intake duct structure of claim 1, characterized in that, one side fixed mounting that sweeps mechanism (7) is kept away from to filter screen (543) has guide arm (542), the one end fixed mounting that filter screen (543) was kept away from to guide arm (542) has plectane (541), sliding sleeve is equipped with annular piece (544) on guide arm (542), fixed mounting has four connecting rods (545) that are circular distribution on the outer wall of annular piece (544), the one end that four connecting rods (545) kept away from each other all is in the same place with the inner wall fixed connection of filter screen (543), one side fixed mounting that annular piece (544) and plectane (541) are close to each other has same straight spring (546), straight spring (546) sliding sleeve is established on guide arm (542).

5. The engine intake duct structure according to claim 1, wherein the sweeping mechanism (7) further comprises a cylinder (71) penetrating the filter screen (543) and fixedly connected to the filter screen (543), a partition plate (73) is fixedly arranged at the top of the cylinder (71), a rotating shaft (72) is arranged on the partition plate (73) in a penetrating way, the rotating shaft (72) is rotatably connected with the clapboard (73), the top end of the rotating shaft (72) is fixedly connected with the paddle (76), the rotating shaft (72) penetrates through the scraper (74) and is fixedly connected with the scraper (74), a nest-rolling spring (75) is arranged in the cylinder (71), the nest-rolling spring (75) is rotatably sleeved on the rotating shaft (72), one end of the nest-rolling spring (75) far away from the circle center is fixedly connected with the inner wall of the cylinder (71), one end of the socket coil spring (75) close to the circle center is fixedly connected with the rotating shaft (72).

6. The engine intake duct structure according to claim 1, wherein the material of the intake duct inner duct (3) and the intake duct cowling (4) is a carbon fiber laminate with a thickness of 2.5mm, and the material of the engine connecting ring (1) and the intake duct rear section (2) is 7050 aluminum alloy.

7. The engine intake duct structure according to claim 1, wherein a latticed protective net is fixedly installed in each of the two intake duct fairings (4).

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