CN113123874A

CN113123874A - Small-sized aviation starter air inlet shell and machining process thereof

Info

Publication number: CN113123874A
Application number: CN202110382114.7A
Authority: CN
Inventors: 居瑞祥
Original assignee: Chuzhou Yiteng Precision Manufacturing Co Ltd
Current assignee: Chuzhou Yiteng Precision Manufacturing Co Ltd
Priority date: 2021-04-09
Filing date: 2021-04-09
Publication date: 2021-07-16
Anticipated expiration: 2041-04-09
Also published as: CN113123874B

Abstract

The invention relates to the technical field of aviation starters, and discloses a small-sized aviation starter air inlet shell and a machining process thereof. The air-tight cover is reasonable in structure, the air-tight cover can be conveniently disassembled and assembled, the maintenance is more convenient, dust particles in air can be filtered, the service life of an engine is prolonged, the size of air flow can be conveniently adjusted, and the air tightness is good.

Description

Small-sized aviation starter air inlet shell and machining process thereof

Technical Field

The invention relates to the technical field of aviation starters, in particular to a small-sized aviation starter air inlet shell and a machining process thereof.

Background

The aviation starter is also called an aviation engine, is a highly complex and precise thermal machine, is used as the heart of an airplane, is not only the power for flying the airplane, but also an important driving force for promoting the development of aviation industry, and each important change in human aviation history is inseparable from the technical progress of the aviation engine.

Aeroengine drives the aircraft flight through inhaling the air and pressurize high-speed spun mode again, and aeroengine air inlet housing is the important component part of aeroengine, has the effect of leading to the air current, and aeroengine air inlet housing among the prior art is mostly monolithic structure, and the dismouting of unable convenient carrying on is not convenient for clear up and maintain its inside, and the dust granule that admits air can cause the damage to the engine to reduce engine life.

Disclosure of Invention

The invention provides a small-sized aviation starter air inlet shell and a processing technology thereof, which solve the problems in the background technology.

In order to achieve the purpose, the invention adopts the following technical scheme:

a small-sized aviation starter air inlet shell comprises an air inlet shell body, wherein an air inlet channel groove is formed in one side of the air inlet shell body, a mounting groove is formed in one side, away from the air inlet channel groove, of the air inlet shell body, an airtight cover is detachably mounted on one side, close to the air inlet channel groove, of the air inlet shell body, an air inlet connecting pipeline is welded at the bottom end of the air inlet shell body, an exhaust connecting pipeline is welded at one side of the air inlet shell body, the air inlet connecting pipeline and the exhaust connecting pipeline are communicated with the air inlet channel groove, a positioning groove is formed in the inner wall, facing the airtight cover, of the air inlet channel groove, a positioning rod is fixedly connected to one side, close to the positioning groove, of the airtight cover, one end, away from the airtight cover, of the positioning rod extends into the positioning, the filter screen is installed on the fixed frame, and three the fixed frame is the annular array distribution about the axle center of locating lever.

Preferably, airtight cover locking mechanical system includes two elastic rods, two elastic rods respectively fixed mounting on the top inner wall and the bottom inner wall of mounting groove, the equal fixedly connected with connecting block in one side that two elastic rods are close to each other, one side fixedly connected with locking couple that the connecting block is close to the locating lever, has seted up two intercommunication grooves on the mounting groove is close to one side inner wall of locating lever, two in the locking couple extends to positioning groove through the intercommunication groove, the locating lever is close to the both sides of locking couple and has all seted up the locking and hang the groove, the locking couple matches with the locking and hang the groove each other, two install actuating mechanism between the connecting block.

Preferably, actuating mechanism includes mounting panel, pivot, first gear and rack, and the mounting panel passes through bolt fixed mounting in the one side that the casing main part of admitting air is close to the mounting groove, and the pivot rotates the table on the mounting panel, the one end of pivot extend to the mounting groove in and with first gear, the rack is equipped with two, and two the rack corresponds fixed connection respectively in the one side that two connecting blocks are close to each other, two racks are parallel to each other, and first gear is located between two racks, and first gear and two rack equal meshes.

Preferably, one end of the rotating shaft, which is far away from the first gear, extends to one side of the mounting plate, which is far away from the main body of the air inlet shell, and is fixedly connected with a knob.

Preferably, the elastic rod includes head rod and second connecting rod, and the mounting groove has been seted up to the one end of head rod, the second connecting rod be close to the head rod one end slidable mounting in the mounting groove and with the mounting groove between the inner wall fixedly connected with spring, the other end of second connecting rod extend to the outside of mounting groove and with connecting block fixed connection.

Preferably, the guide bar of the vertical setting of fixedly connected with between the top inner wall of mounting groove and the bottom inner wall, fixedly connected with guide sleeve on the connecting block, guide sleeve slidable mounting is in the outside of guide bar.

Preferably, the airtight cover and the air inlet housing body are fixed through bolts, and a rubber airtight pad is fixedly connected to one side of the airtight cover close to the air inlet housing body.

Preferably, a connecting flange is welded at one end, away from the air inlet shell body, of the exhaust connecting pipeline and the air inlet connecting pipeline, a driving cover is welded at the top end of the exhaust connecting pipeline, a servo motor is fixedly mounted at the top end of the driving cover, the output of the servo motor extends into the driving cover and is fixedly connected with a second gear, threaded rods are rotatably mounted on two sides, located in the second gear, of the driving cover, third gears are fixedly connected with the outer sides of the threaded rods, the second gears are located between the two third gears, the third gears are meshed with the two second gears, a driving plate is arranged in the driving cover, two threaded holes are formed in the driving plate, the two threaded rods are respectively in threaded connection with the driving plate through the two threaded holes, a baffle is fixedly connected to the bottom end of the driving plate, and one side, away from the.

Preferably, rolling grooves are formed in the inner walls of the two sides of the driving cover, the two sides, close to the rolling grooves, of the driving plate are rotatably connected with idler wheels, and the idler wheels extend into the rolling grooves.

The machining process of the air inlet shell of the small-sized aviation starter comprises the following steps:

s1: putting a bar blank into a numerical control machine, clamping and fixing one end of the bar blank by a clamp in the numerical control machine, and then processing an air inlet channel groove by the numerical control machine;

s2: stopping the numerical control machine, cutting from the outer edge of the bar blank through the numerical control machine after the bar blank is completely cooled, cutting a buckle matched with the airtight cover, cutting a mounting flange matched with the airtight cover, and processing a mounting hole for inserting a bolt into the airtight cover for subsequent mounting;

s3: continuing to cut the middle part of the outer side of the bar blank by using a numerical control machine, machining mounting flanges at two ends of the bar blank, stopping the machine, replacing the two ends of the bar blank after the bar blank is completely cooled, clamping and fixing the other end of the bar blank by using a clamp, drilling a bolt mounting hole in a flange at one end far away from an airtight cover for integrally mounting the air inlet shell main body;

s4: processing a mounting groove and a communicating groove on the bar blank by using a numerical control machine tool so as to finish rough machining on the bar blank;

s5: and carrying out aging treatment on the rough machined finished product, increasing the hardness and strength of the rough machined finished product, reducing the plastic toughness and internal stress of the rough machined finished product, manually polishing the surface of the rough machined finished product, and finally spraying a layer of antirust paint on the surface of the fine machined finished product.

The invention has the beneficial effects that:

1. through the split design of the air inlet shell body, the air-tight cover can be conveniently disassembled and assembled, so that the air-tight cover can be conveniently taken down and locked, the interior of the air inlet channel groove and the filter screen can be cleaned, and the maintenance is more convenient;

2. because the filter screen is arranged in the airtight cover and used for separating the air inlet connecting pipeline and the air outlet connecting pipeline, the air flow can be filtered by the filter screen, so that dust particles in the air can be filtered, the engine can be prevented from being damaged by the dust particles, and the service life of the engine can be prolonged;

3. the servo motor can drive the second gear to rotate, the second gear is meshed with the third gear to drive the two threaded rods to synchronously rotate, and the threaded rods are in threaded connection with the driving plate, so that the driving plate can be driven to move up and down, the baffle plate can be driven to move up and down, the size of the air outlet can be adjusted, and the size of air flow can be conveniently adjusted;

4. through the design of the airtight cover locking mechanism, the two locking hooks can be clamped on the locking hanging grooves on the two sides of the positioning rod through mutual approaching, so that the airtight cover can be locked, and then the airtight cover is fixed through the bolt, so that the airtight cover is more stable to mount, accurate to position, not easy to fall off and better in air tightness;

the air-tight cover is reasonable in structure, the air-tight cover can be conveniently disassembled and assembled, the maintenance is more convenient, dust particles in air can be filtered, the service life of an engine is prolonged, the size of air flow can be conveniently adjusted, and the air tightness is good.

Drawings

Fig. 1 is a left perspective sectional view of a filter device for an air conditioner according to the present invention.

Fig. 2 is a front view of a filter device for an air conditioner according to the present invention.

Fig. 3 is an enlarged schematic view of a position a of the filter device for an air conditioner according to the present invention.

Fig. 4 is an enlarged schematic view of a position B of the filter device for an air conditioner according to the present invention.

Fig. 5 is a rear view of a mounting groove of a filter unit for an air conditioner according to the present invention.

Fig. 6 is a schematic view of an airtight cover of a filter device for an air conditioner according to the present invention.

Reference numbers in the figures: the air inlet device comprises an air inlet shell body 1, an air inlet channel groove 2, an air inlet channel groove 3, a communicating groove 4, an air-tight cover 5, a bolt 6, a rubber air-tight pad 7, an 8 positioning rod, a 9 mounting plate, a 10 knob, a 11 rotating shaft, an 12 air inlet connecting pipeline 13, a fixing frame 14, a filter screen 15, a positioning groove 15, an elastic rod 16, a 17 connecting block 18, a rack 19, a locking hook 19, a locking hanging groove 20, a first gear 21, a guide rod 22, a guide sleeve 23, an exhaust connecting pipeline 24, a driving cover 25, a servo motor 26, a second gear 27, a threaded rod 28, a third gear 29, a driving plate 30, a roller 31, a rolling groove 32, a baffle 33, a first connecting rod 34, a second connecting rod.

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.

Referring to fig. 1-6, a small-sized aviation starter air inlet casing and a processing technology thereof, comprising an air inlet casing main body 1, wherein one side of the air inlet casing main body 1 is provided with an air inlet channel groove 2, one side of the air inlet casing main body 1, which is far away from the air inlet channel groove 2, is provided with a mounting groove 3, one side of the air inlet casing main body 1, which is close to the air inlet channel groove 2, is detachably provided with an airtight cover 5, the airtight cover 5 can seal the air inlet channel groove 2 when being fixed on the air inlet casing main body 1, so that gas cannot leak out, an air inlet connecting pipeline 12 is welded at the bottom end of the air inlet casing main body 1, an exhaust connecting pipeline 24 is welded at one side of the air inlet casing main body 1, the air inlet connecting pipeline 12 and the exhaust connecting pipeline 24 are both communicated with the air inlet channel groove 2, and air enters the air, thereby changing the direction of the air flow and making the air flow more stable, a positioning groove 15 is arranged on the inner wall of one side of the air inlet channel groove 2 facing the airtight cover 5, one side of the airtight cover 5 close to the positioning groove 15 is fixedly connected with a positioning rod 8, one end of the positioning rod 8 far away from the airtight cover 5 extends into the positioning groove 15, an airtight cover locking mechanism is arranged in the mounting groove 3 and is used for locking the airtight cover 5 so as to position the airtight cover 5 and prevent the airtight cover 5 from falling off, three fixing frames 13 are fixedly connected with the outer side of the positioning rod 8, filter screens 14 are arranged on the fixing frames 13 and are distributed in an annular array around the axis of the positioning rod 8, the three filter screens 14 are used for separating the air inlet connecting pipeline 12 and the air outlet connecting pipeline 24, so that the air flow can be filtered by the filter screens 14, the dust particles can be prevented from damaging the engine, and the service life of the engine is prolonged.

Wherein, the airtight cover locking mechanism comprises two elastic rods 16, the two elastic rods 16 are respectively fixedly arranged on the inner wall of the top end and the inner wall of the bottom end of the mounting groove 3, one side of the two elastic rods 16 close to each other is fixedly connected with a connecting block 17, one side of the connecting block 17 close to the positioning rod 8 is fixedly connected with a locking hook 19, the inner wall of the mounting groove 3 close to the positioning rod 8 is provided with two communicating grooves 4, the two locking hooks 19 extend into the positioning groove 15 through the communicating grooves 4, the two sides of the positioning rod 8 close to the locking hooks 19 are both provided with locking hanging grooves 20, the locking hooks 19 are matched with the locking hanging grooves 20, a driving mechanism is arranged between the two connecting blocks 17, when the airtight cover 5 is closed, the positioning rod 8 is just inserted into the positioning groove 15, at the moment, the two locking hooks 19 which can be brought by driving the two connecting blocks 17 close, thereby can lock airtight cover 5, then airtight cover 5 is fixed to rethread bolt 6, and airtight cover 5 installation is more stable, and fixes a position accurately, is difficult for droing, and the gas tightness is better.

Wherein, the driving mechanism comprises a mounting plate 9, a rotating shaft 11, a first gear 21 and two racks 18, the mounting plate 9 is fixedly mounted on one side of the air inlet casing body 1 close to the mounting groove 3 through bolts, the rotating shaft 11 rotates on the mounting plate 9, one end of the rotating shaft 11 extends into the mounting groove 3 and is engaged with the first gear 21, the two racks 18 are respectively and correspondingly fixedly connected to one side of the two connecting blocks 17 close to each other, the two racks 18 are parallel to each other, the first gear 21 is positioned between the two racks 18, the first gear 21 is engaged with the two racks 18, the first gear 21 can be driven when the rotating shaft 11 is rotated, the two racks 18 can be driven to move away from each other when the first gear 21 rotates, thereby overcoming the elasticity of the elastic rod 16 to push the locking hook 19 and separate from the locking hanging groove 20 on the positioning rod 8, and further facilitating the disassembly and assembly of the locking airtight cover 5, thereby can be convenient take off locking airtight cover 5 and clear up air inlet channel recess 2 inside and filter screen 14, it is more convenient to maintain.

Wherein, the one end that first gear 21 was kept away from to pivot 11 extends to one side and fixedly connected with knob 10 that the mounting panel 9 kept away from air inlet housing body 1, and the outside of knob 10 has anti-skidding texture, through knob 10 can be convenient rotate pivot 11, and then drive first gear 21 and rotate.

Wherein, elastic rod 16 includes head rod 34 and second connecting rod 35, the mounting groove has been seted up to head rod 34's one end, second connecting rod 35 be close to head rod 34 one end slidable mounting in the mounting groove and with the mounting groove between the inner wall fixedly connected with spring 36, the other end of second connecting rod 35 extend to the outside of mounting groove and with connecting block 17 fixed connection, second connecting rod 35 can slide and compression spring 36 in the mounting groove for elastic rod 16 has elasticity and can be compressed.

Wherein, the guide bar 22 of the vertical setting of fixedly connected with between the top inner wall of mounting groove 3 and the bottom inner wall, fixedly connected with guide sleeve 23 on the connecting block 17, guide sleeve 23 slidable mounting is in the outside of guide bar 22, and guide sleeve 23 plays sliding guide's effect, and when connecting block 17 slided from top to bottom, guide sleeve 23 slided in the outside of guide bar 22 for connecting block 17 removes more steadily.

The airtight cover 5 and the air inlet housing body 1 are fixed through bolts 6, a rubber airtight pad 7 is fixedly connected to one side, close to the air inlet housing body 1, of the airtight cover 5, and the existence of the rubber airtight pad 7 can effectively enhance the airtightness between the airtight cover 5 and the air inlet housing body 1.

Wherein, the exhaust connecting pipeline 24 and the intake connecting pipeline 12 are welded with connecting flanges at the ends far away from the intake casing main body 1, the exhaust connecting pipeline 24 is welded with a driving cover 25 at the top end, a servo motor 26 is fixedly installed at the top end of the driving cover 25, the output of the servo motor 26 extends into the driving cover 25 and is fixedly connected with a second gear 27, a threaded rod 28 is rotatably installed at both sides of the second gear 27 in the driving cover 25, a third gear 29 is fixedly connected with the outer side of the threaded rod 28, the second gear 27 is positioned between the two third gears 29, the third gear 29 is engaged with the two second gears 27, a driving plate 30 is arranged in the driving cover 25, two threaded holes are opened on the driving plate 30, the two threaded rods 28 are respectively in threaded connection with the driving plate 30 through the two threaded holes, a baffle 33 is fixedly connected with the bottom end of the driving plate 30, one side of the baffle 33 far away from the driving, servo motor 26 can two-way rotation, can drive second gear 27 when servo motor 26 rotates and rotate, can drive two threaded rods 28 synchronous rotations through the meshing of second gear 27 with third gear 29, because threaded rod 28 and drive plate 30 threaded connection to can drive plate 30 lifting movement, thereby drive baffle 33 lifting movement, can adjust the size of gas outlet, make the air current size can be convenient adjust.

Wherein, all seted up the roll groove 32 on the both sides inner wall of drive cover 25, the both sides that drive plate 30 is close to roll groove 32 all rotate and are connected with gyro wheel 31, and in gyro wheel 31 extended to roll groove 32, gyro wheel 31 and roll groove 32 can play sliding guide's effect, reduce the frictional force between drive plate 30 and the drive cover 25 inner wall.

s1: putting a bar blank into a numerical control machine, clamping and fixing one end of the bar blank by a clamp in the numerical control machine, and then processing an air inlet channel groove 2 by the numerical control machine;

s2: stopping the numerical control machine, cutting from the outer edge of the bar blank through the numerical control machine after the bar blank is completely cooled, cutting a buckle matched with the airtight cover 5, cutting a mounting flange matched with the airtight cover 5, and processing a mounting hole for inserting a bolt into the subsequent installation of the airtight cover 5;

s3: continuing to cut the middle part of the outer side of the bar blank by using a numerical control machine, processing mounting flanges at two ends of the bar blank, stopping the machine, after the bar blank is completely cooled, replacing the two ends of the bar blank, clamping and fixing the other end of the bar blank by using a clamp, and drilling a bolt mounting hole in a flange at one end far away from the airtight cover 5 for integrally mounting the air inlet shell main body 1;

s4: processing a bar blank into a mounting groove 3 and a communicating groove 4 by using a numerical control machine tool so as to finish rough machining of the bar blank;

The working principle is as follows: during assembly, the airtight cover 5 is clamped on one side of the air inlet shell body 1, the knob 10 is rotated manually to drive the two locking hooks 19 to be away from each other, the positioning rod 8 is inserted into the positioning groove 15, the knob 10 is loosened, the locking hooks 19 are driven to be automatically inserted into the locking hanging grooves 20 due to the elastic force of the elastic rod 16, the airtight cover 5 is locked, then the bolt 6 is installed again, assembly can be completed, the airtight cover 5 is more convenient to disassemble and assemble, the airtight cover 5 can be conveniently taken down and locked, the interior of the air inlet channel groove 2 and the filter screen 14 can be cleaned, maintenance is more convenient, the filter screen 14 is used for separating the air inlet connecting pipeline 12 and the air outlet connecting pipeline 24, airflow can be filtered through the filter screen 14, dust particles in the air can be filtered, the engine can be prevented from being damaged by the dust particles, the service life of the engine is, servo motor 26 can two-way rotation, can drive second gear 27 when servo motor 26 rotates and rotate, can drive two threaded rods 28 synchronous rotations through the meshing of second gear 27 with third gear 29, because threaded rod 28 and drive plate 30 threaded connection to can drive plate 30 lifting movement, thereby drive baffle 33 lifting movement, can adjust the size of gas outlet, make the air current size can be convenient adjust.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

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

1. The air inlet shell of the small aviation starter comprises an air inlet shell body (1) and is characterized in that an air inlet channel groove (2) is formed in one side of the air inlet shell body (1), a mounting groove (3) is formed in one side, away from the air inlet channel groove (2), of the air inlet shell body (1), an airtight cover (5) is detachably mounted on one side, close to the air inlet channel groove (2), of the air inlet shell body (1), an air inlet connecting pipeline (12) is welded at the bottom end of the air inlet shell body (1), an exhaust connecting pipeline (24) is welded on one side of the air inlet shell body (1), the air inlet connecting pipeline (12) and the exhaust connecting pipeline (24) are communicated with the air inlet channel groove (2), and a positioning groove (15) is formed in the inner wall, facing the airtight cover (5), of the air inlet channel groove (2), airtight cover (5) are close to one side fixedly connected with locating lever (8) of positioning groove (15), in one end that airtight cover (5) were kept away from in locating lever (8) extended to positioning groove (15), installed airtight cover locking mechanical system in mounting groove (3), three fixed frame (13) of outside fixedly connected with of locating lever (8), install filter screen (14) on fixed frame (13), and three fixed frame (13) are the annular array and distribute about the axle center of locating lever (8).

2. The small-sized aviation starter air inlet casing according to claim 1, wherein the airtight cover locking mechanism comprises two elastic rods (16), the two elastic rods (16) are respectively and fixedly installed on the inner walls of the top end and the bottom end of the installation groove (3), one sides of the two elastic rods (16) close to each other are respectively and fixedly connected with a connecting block (17), one side of the connecting block (17) close to the positioning rod (8) is fixedly connected with a locking hook (19), the inner wall of the installation groove (3) close to the positioning rod (8) is provided with two communicating grooves (4), the two locking hooks (19) extend into the positioning groove (15) through the communicating grooves (4), the two sides of the positioning rod (8) close to the locking hook (19) are respectively provided with a locking hanging groove (20), and the locking hooks (19) are matched with the locking hanging grooves (20), a driving mechanism is arranged between the two connecting blocks (17).

3. The small-sized aviation starter air inlet casing is characterized in that the driving mechanism comprises a mounting plate (9), a rotating shaft (11), a first gear (21) and two racks (18), the mounting plate (9) is fixedly mounted on one side, close to the mounting groove (3), of the air inlet casing main body (1) through bolts, the rotating shaft (11) rotates on the mounting plate (9), one end of the rotating shaft (11) extends into the mounting groove (3) and is connected with the first gear (21), the two racks (18) are arranged, the two racks (18) are respectively and fixedly connected to one sides, close to the two connecting blocks (17), the two racks (18) are parallel to each other, the first gear (21) is located between the two racks (18), and the first gear (21) is meshed with the two racks (18).

4. A compact aircraft starter intake housing according to claim 3, characterized in that the end of the rotary shaft (11) remote from the first gear (21) extends to the side of the mounting plate (9) remote from the intake housing body (1) and is fixedly connected with a knob (10).

5. The small aircraft starter air inlet casing as claimed in claim 2, wherein the elastic rod (16) comprises a first connecting rod (34) and a second connecting rod (35), one end of the first connecting rod (34) is provided with a mounting groove, one end of the second connecting rod (35) close to the first connecting rod (34) is slidably mounted in the mounting groove and is fixedly connected with a spring (36) between the second connecting rod and the inner wall of the mounting groove, and the other end of the second connecting rod (35) extends to the outside of the mounting groove and is fixedly connected with the connecting block (17).

6. The small aircraft starter air inlet casing as claimed in claim 3, characterized in that a vertically arranged guide rod (22) is fixedly connected between the top end inner wall and the bottom end inner wall of the mounting groove (3), a guide sleeve (23) is fixedly connected to the connecting block (17), and the guide sleeve (23) is slidably mounted on the outer side of the guide rod (22).

7. The small-sized aircraft starter air inlet housing as claimed in claim 1, characterized in that the airtight cover (5) is fixed with the air inlet housing main body (1) through a bolt (6), and a rubber airtight pad (7) is fixedly connected to one side of the airtight cover (5) close to the air inlet housing main body (1).

8. The small-sized aviation starter air inlet casing as claimed in claim 1, wherein connecting flanges are welded at one ends of the exhaust connecting pipeline (24) and the air inlet connecting pipeline (12) far away from the air inlet casing main body (1), a driving cover (25) is welded at the top end of the exhaust connecting pipeline (24), a servo motor (26) is fixedly installed at the top end of the driving cover (25), the output of the servo motor (26) extends into the driving cover (25) and is fixedly connected with a second gear (27), threaded rods (28) are rotatably installed at two sides of the second gear (27) in the driving cover (25), a third gear (29) is fixedly connected to the outer side of each threaded rod (28), the second gear (27) is located between the two third gears (29), the third gears (29) are meshed with the two second gears (27), and a driving plate (30) is arranged in the driving cover (25), two threaded holes are formed in the drive plate (30), the two threaded rods (28) are in threaded connection with the drive plate (30) through the two threaded holes respectively, a baffle (33) is fixedly connected to the bottom end of the drive plate (30), and one side, far away from the drive plate (30), of the baffle (33) extends into the exhaust connecting pipeline (24).

9. The small aircraft starter air inlet casing as claimed in claim 8, wherein rolling grooves (32) are formed in the inner walls of the two sides of the driving cover (25), rollers (31) are rotatably connected to the two sides of the driving plate (30) close to the rolling grooves (32), and the rollers (31) extend into the rolling grooves (32).

10. A machining process for a small-sized aviation starter air inlet shell is characterized by comprising the following steps:

s1: putting a bar blank into a numerical control machine, clamping and fixing one end of the bar blank by a clamp in the numerical control machine, and then processing an air inlet channel groove (2) by the numerical control machine;

s2: stopping the numerical control machine, cutting the outer edge of the bar blank by the numerical control machine after the bar blank is completely cooled, cutting a buckle matched with the airtight cover (5), cutting a mounting flange matched with the airtight cover (5), and processing a mounting hole for inserting a bolt when the airtight cover (5) is subsequently mounted;

s3: continuing to cut the middle part of the outer side of the bar blank by using a numerical control machine, processing mounting flanges at two ends of the bar blank, stopping the machine, after the bar blank is completely cooled, replacing the two ends of the bar blank, clamping and fixing the other end of the bar blank by using a clamp, drilling a bolt mounting hole in a flange at one end far away from an airtight cover (5) for integrally mounting the air inlet shell main body (1);

s4: machining a mounting groove (3) and a communicating groove (4) on the bar blank by using a numerical control machine tool so as to finish rough machining on the bar blank;