CN218280922U - Special dust removal piece and automatic dust exhaust port for aircraft bleed air system - Google Patents

Abstract

The utility model relates to an aircraft engine bleed system field especially relates to special dust removal piece of aircraft bleed system and automatic dust exhaust mouth. The dust removal part is an axial flow type cyclone dust removal device, and a dust collection box is arranged below the exhaust pipe which is close to the flange edge; the automatic dust exhaust port comprises an actuating cavity, the middle part of the actuating cavity comprises an actuating piston, and the actuating piston is connected with a dust exhaust valve below the actuating piston through a vertical rod piece; springs are arranged below the actuating piston and on the bottom wall of the actuating cavity at the same time; the upper part of the actuating piston is communicated with an air pressure conduit; an exhaust pipe extends out of the side of the actuating cavity; the actuating chamber is arranged in the dust collecting box, the bottom wall of the dust collecting box comprises an opening part, namely a dust exhaust port, and the inward inclined closed wall of the dust exhaust valve can be matched with the dust exhaust port. The automatic dust removal and automatic dust exhaust can be provided for the air entraining system and the air entraining system components, and the pollution degree of the air entraining system and the air entraining system components caused by dust particles in the air can be reduced, so that the frequent fault condition of the air entraining system components is reduced.

Description

Special dust removal piece and automatic dust exhaust port for aircraft bleed air system

Technical Field

The utility model relates to an aircraft engine bleed air system field especially relates to special dust removal piece of aircraft bleed air system and automatic dust exhaust mouth.

Background

Air filter elements of automotive engines become dirty and clogged after a period of use because of the dust particles contained in the air. Air can pass through the air filter element before being sucked into an automobile engine, and dust particles can be blocked by the filter element; when dust particles are accumulated on the filter element, the filter element becomes dirty and blocked, so that the air inflow is reduced, and the power of the engine is reduced. The aircraft engine also draws in a large amount of air during operation, but the air does not have a pre-air filtration device as in a car before entering the aircraft engine. As mentioned above, the air intake of the aircraft engine also causes the internal components of the engine and the associated systems to become dirty or clogged due to the dust particles contained in the air, which over time can cause the performance of these aircraft components that are operated on the air to deteriorate or even fail.

In modern civil aircraft, a bleed air system is provided in particular for controlling and managing the hot bleed air at high temperature and pressure from the aircraft engines. The bleed air led out from the system and adjusted can be delivered to other ten subsystems on the airplane to take part in corresponding work, and the importance of the system can be seen, but the system is also one of the systems with the highest failure rate, and the failure is frequent. The civil aviation maintenance industry has been discussed for many years, but the fundamental problem is not solved. The reason for this is that: most of the components in the system are operated on air and must therefore be contaminated by dust particles in the air.

An air filter screen 101 of an air-entraining temperature controller in an air-entraining system is blocked due to serious pollution of dust particles in air, so that air-entraining cannot enter the controller, parts connected with the controller cannot work normally, and finally the whole air-entraining system is over-temperature, so that serious faults of air-entraining failure of an engine are caused. Particularly in northwest areas of China, due to the fact that dust content in air is large and sand weather is added sometimes, after flights operate for a period of time, serious blocking situations as shown in the figure occur, and there are many flights which are forced to land or return to the air due to serious faults caused by double bleed air failure. The current solution is to increase the workload of maintenance of the engineering and shorten the troubleshooting period; the flight operation safety is ensured in a mode of increasing the cost of manpower and material resources.

Because no pre-air filter is installed between the air inlet cover of the aircraft engine and the fan blades of the engine, and the filter cannot be installed in the area. To this end, the utility model discloses then provide in the bleed system and install dust collector's two kinds of schemes on the bleed system part, realize the automatic dust removal and the automatic dust exhaust of bleed system and bleed system part to solve or improve above-mentioned problem.

SUMMERY OF THE UTILITY MODEL

The purpose of the utility model is that: in order to provide more effective dust removing parts special for the aircraft bleed air system and an automatic dust discharging port, the specific purpose is to see a plurality of substantial technical effects of the specific implementation part.

In order to achieve the purpose, the utility model adopts the following technical proposal:

the first series of schemes: a special dust removal piece for an aircraft bleed air system and an automatic dust exhaust port;

the automatic dust exhaust port of the dust removal part special for the aircraft bleed air system is characterized in that the automatic dust exhaust port comprises an actuating cavity, the middle part of the actuating cavity comprises an actuating piston, the actuating piston is connected with a dust exhaust valve below through a vertical rod piece, and the dust exhaust valve comprises a closed wall inclined inwards; springs are arranged below the actuating piston and on the bottom wall of the actuating cavity at the same time; the upper part of the actuating piston is communicated with an air pressure conduit; an exhaust pipe extends out of the side of the actuating cavity; the actuating chamber is arranged in the dust collecting box, the bottom wall of the dust collecting box comprises an opening part, namely a dust discharging opening, and the sealing wall of the dust discharging valve which inclines inwards can be matched with the dust discharging opening.

The further technical proposal of the utility model is that a filter screen is arranged at the inlet of the air pressure conduit.

The utility model discloses further technical scheme lies in, and the import pipe that contains the flange limit at axial-flow type cyclone is arranged to the atmospheric pressure pipe.

The special dust removal piece for the aircraft bleed air system is characterized in that the dust removal piece is an axial flow type cyclone dust removal device, the axial flow type cyclone dust removal device comprises a shell, an inlet pipe with a flange edge is arranged on one side of the shell, and an exhaust pipe with a flange edge is arranged on the other side of the shell; the mouth part of the exhaust pipe with the flange edge is provided with a central filter screen;

a dust collecting box is arranged below the exhaust pipe which is close to the flange edge;

the dust exhaust device comprises a dust exhaust valve, a dust exhaust valve and a dust exhaust valve, wherein the dust exhaust valve is arranged in the dust exhaust chamber; springs are arranged below the actuating piston and on the bottom wall of the actuating cavity at the same time; the upper part of the actuating piston is communicated with an air pressure conduit; an exhaust pipe extends out of the side of the actuating cavity; the actuating chamber is arranged in the dust collecting box, the bottom wall of the dust collecting box comprises an opening part, namely a dust discharging opening, and the sealing wall of the dust discharging valve which inclines inwards can be matched with the dust discharging opening.

The utility model has the further technical proposal that the utility model also comprises a first-stage blade disc and a second-stage blade disc, wherein the first-stage blade disc is composed of a plurality of blades, one end of the first-stage blade disc is connected with the inner cylindrical surface of the shell, and the other end of the first-stage blade disc is connected with the outer cylindrical surface of the flow guide core body; the second-stage blade disc is of an integral disc structure, the whole blade disc of the second-stage blade disc is fixed on the outer cylindrical surface of the flow guide core body through a plurality of bolts, and the second-stage blade disc is adjacent to the first-stage blade disc.

The utility model discloses a further technical scheme lies in, the afterbody of water conservancy diversion core is connected with the preceding tip phase of alternately blade, and alternately blade's rear end position is connected with the flange limit that contains the blast pipe on flange limit, and central filter screen is fixed between water conservancy diversion core and alternately blade, and central filter screen uses alternately blade's each spine as the atress support region.

The utility model discloses a further technical scheme lie in, the alternately blade be the rectifier blade.

The utility model discloses a further technical scheme lies in, special dust removal piece is installed at the exit end of the well high-pressure compressor of engine promptly at the foremost of engine bleed system, provides leading dust removal mode for whole bleed system.

The utility model has the further technical proposal that the special dust removing piece is arranged at the fan end of the engine; and/or special dust removing pieces are respectively arranged at the outlet ends of all stages of the engine.

The utility model discloses a further technical scheme lies in, and special dust removal spare is installed in the bleed pipeline, and the air current direction is unanimous among entry air current direction and the pipeline, for axial-flow type cyclone.

A second series of protocols: a special dust removal part for an airplane bleed air system component and an automatic dust exhaust port;

the automatic dust discharging port of the dust removing part special for the aircraft bleed air system component is characterized by comprising a centrifugal cyclone dust removing device fixing plate, wherein a plurality of holes are formed in the centrifugal cyclone dust removing device fixing plate and used for allowing dust to fall down, and a circle of reflecting barrier is arranged below the centrifugal cyclone dust removing device fixing plate; the reflecting screen is of a cone-like structure, and a gap is reserved between the reflecting screen and the side wall of the dust collection box of the centrifugal cyclone dust collector; the centrifugal cyclone dust collector comprises a centrifugal cyclone dust collector dust collecting box, a rotating fulcrum and a dust discharging plate, wherein the rotating fulcrum is a shaft fixed on the side wall of the centrifugal cyclone dust collector dust collecting box, and the dust discharging plate can rotate around the rotating fulcrum; the centrifugal cyclone dust collector comprises a centrifugal cyclone dust collector air plate perpendicular to the centrifugal cyclone dust collector air plate, and a limiting block is further arranged on the side wall of a centrifugal cyclone dust collector dust collecting box and can limit the rotation limit position of the centrifugal cyclone dust collector dust plate.

The utility model discloses a further technical scheme lies in, is fixing centrifugal cyclone alternately the acanthus leaf on the centrifugal cyclone fixed plate.

The special dust removal part for the aircraft bleed air system component is characterized by comprising a centrifugal cyclone dust removal device shell, wherein a centrifugal cyclone dust removal device air inlet pipe is arranged on the centrifugal cyclone dust removal device shell, and the special dust removal part also comprises a vertical centrifugal cyclone dust removal device exhaust pipe.

The utility model discloses a further technical scheme lies in, centrifugal cyclone dust collector filter screen one has been arranged to centrifugal cyclone dust collector blast pipe top.

The utility model discloses further technical scheme lies in, bimetallic strip has been arranged to centrifugal whirlwind dust collector filter screen top.

The utility model has the further technical proposal that the topmost part of the shell of the centrifugal cyclone dust collector comprises an adapter sleeve, and the adapter sleeve comprises screw threads and is connected with the shell screw thread mounting hole of the air entraining temperature controller through the adapter sleeve; the centrifugal cyclone dust removal device and the bleed air temperature controller are both positioned in the bleed air system.

The utility model discloses a further technical scheme lies in, the quantity of bimetallic strip is two, bimetallic strip bilateral symmetry, and the end of every metal strip respectively takes a little tup of metal.

The technical scheme of the utility model is that the exhaust pipe of the centrifugal cyclone dust collector is positioned under the filter screen I of the centrifugal cyclone dust collector, is connected with the top end of the shell of the centrifugal cyclone dust collector and extends into the shell of the centrifugal cyclone dust collector; the exhaust pipe of the centrifugal cyclone dust removal device is concentric with the shell of the centrifugal cyclone dust removal device, and the position of the exhaust port of the exhaust pipe of the centrifugal cyclone dust removal device is slightly lower than the lowest position of the air inlet pipe of the centrifugal cyclone dust removal device.

The utility model discloses a further technical scheme lies in, centrifugal cyclone dust collector intake pipe is venturi tube shape.

The utility model discloses a further technical scheme lies in, bimetallic strip is for taking elastic sheetmetal.

Adopt above technical scheme the utility model discloses, for prior art have following beneficial effect: this patent can realize providing automatic dust removal and automatic dust exhaust for bleed air system and bleed air system part, can reduce bleed air system and bleed air system part and receive the pollution degree of dust particle in the air to reduce the condition that bleed air system part trouble is frequently sent out, guarantee the punctual rate and the safe operation of flight. In addition, the workload of maintenance of the engineering can be reduced, the troubleshooting period is prolonged, and the cost of manpower and material resources is reduced. The beneficial effects can be embodied as saving the cost of aviation materials and labor cost and bringing more economic benefits for airlines.

Drawings

To further illustrate the present invention, further description is provided below with reference to the accompanying drawings:

FIG. 1 is a schematic diagram of an engine bleed air system (in which an axial flow cyclonic dust removal device 2 is mounted);

FIG. 2 is a schematic view showing the construction of the axial flow type cyclone dust removing device 2 (the right side is an enlarged view of the dust collecting case 209);

FIG. 3 is a schematic view showing the operation of the axial flow type cyclone dust removing device 2 (the right side is an enlarged view of the dust box 209);

FIG. 4 is a schematic view of the centrifugal cyclone dust collector 3 (the right side is a partially enlarged view);

fig. 5 is a schematic view of the operation of the centrifugal cyclone dust collector 3 mounted on the bleed air temperature controller 1 (the right side is a partially enlarged view);

FIG. 6 is an enlarged view of a part of the construction of the axial flow type cyclone dust removing apparatus 2;

FIG. 7 is a block diagram of a cross-over vane of option one;

FIG. 8 is a block diagram of a cross-over vane of option two;

FIG. 9 is a structural view of a dust removing part in the second embodiment;

wherein: 1. a bleed air temperature controller; 101. an air strainer;

2. an axial flow type cyclone dust removing device; 201. a housing; 202. an inlet pipe comprising a flanged edge; 203. an exhaust pipe including a flange; 204. a first-stage blade disc; 205. a secondary leaf disc; 206. a flow guiding core body; 207. a central filter screen; 208. a cross blade; 209, a dust collection box; 2010. the wall surface of the shell; 2091. filtering with a screen; 2092. a pneumatic conduit; 2093. an actuating piston; 2094. a spring; 2095. an exhaust pipe; 2096. a dust exhaust valve; 2097. a dust exhaust port; 2098. an actuating chamber;

3. a centrifugal cyclone dust collector; 301. a transfer sleeve; 302. a bimetal; 303. a first filter screen of the centrifugal cyclone dust removal device; 304. an exhaust pipe of the centrifugal cyclone dust removal device; 305. a filter screen II of the centrifugal cyclone dust removal device; 306. an air inlet pipe of the centrifugal cyclone dust removal device; 307. the centrifugal cyclone dust collector crosses the blade plate; 308. a dust collecting box of the centrifugal cyclone dust collector; 309. a dust exhaust plate of the centrifugal cyclone dust removal device; 310. a centrifugal cyclone dust removal device air plate; 311. rotating a fulcrum; 312. a limiting block; 313. a reflective barrier; 314. a centrifugal cyclone dust collector fixing plate; 315. centrifugal cyclone dust collector casing.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings and embodiments, which are to be understood as illustrative only and not limiting the scope of the invention. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly and encompass, for example, both fixed and removable coupling as well as integral coupling; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.

It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The patent provides a plurality of parallel schemes, and different expressions belong to an improved scheme based on a basic scheme or a parallel scheme. Each solution has its own unique features. In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other. The fixing means, which is not described herein, may be any one of screw fixing, bolt fixing, or glue bonding.

Examples one to ten are a first series of approaches: a special dust removal piece for an airplane bleed air system and an automatic dust exhaust port;

the first embodiment is as follows: combining fig. 1 with fig. 2 and fig. 3; and fig. 6 and 7;

the automatic dust exhaust port of the dust removing part special for the aircraft bleed air system is characterized by comprising an actuating cavity 2098, the middle part of the actuating cavity 2098 comprises an actuating piston 2093, the actuating piston 2093 is connected with a lower dust exhaust valve 2096 through a vertical rod, and the dust exhaust valve 2096 comprises a closed wall which inclines inwards; a spring 2094 is disposed below the actuating piston 2093 and on the bottom wall of the actuating chamber 2098; an air pressure conduit 2092 is communicated above the actuating piston 2093; an exhaust pipe 2095 extends out of the side of the actuating cavity 2098; the actuating chamber 2098 is disposed in the dust box 209, the bottom wall of the dust box 209 includes a mouth portion, i.e., a dust outlet 2097, and the inwardly inclined closing wall of the dust valve 2096 is capable of engaging with the dust outlet 2097. The technical scheme of the invention has the following substantial technical effects and the realization process, namely the basic functions: as shown in fig. 2 and 3 and the enlarged view thereof, the dust box 209 is opened when the axial flow type cyclone dust removing device 2 is in the non-operating state. When the axial flow type cyclone dust collector 2 works, the air-entraining pressure firstly enters the actuating cavity 2098 through the air pressure conduit 2092, the actuating piston 2093 overcomes the elastic force of the spring 2094 under the action of air pressure to push the dust exhaust valve 2096 to move downwards, the conical surface area of the dust exhaust valve 2096 is attached to the inclined opening area of the dust exhaust opening 2097, the dust collection box 209 is closed, and therefore the axial flow type cyclone dust collector 2 works normally, as shown in the enlarged diagram of fig. 3.

The separated dust particles are introduced into the dust box 209 and temporarily stored in the dust box 209. When the air-entraining is finished and the air-entraining pressure disappears, the actuating piston 2093 drives the dust exhaust valve 2096 to move upwards under the action of the spring 2094, the conical surface area of the dust exhaust valve 2096 is separated from the bevel area of the dust exhaust port 2097, and dust particles stored in the dust collection box 209 are exhausted out of the axial-flow type cyclone dust removal device 2 through the dust exhaust port 2097. When the air-entraining system works, the axial flow type cyclone dust removing device 2 circularly works according to the working principle to automatically remove dust and automatically exhaust dust for the air-entraining system.

The automatic dust exhaust port of the embodiment is of a single unique design, even designed as a separable structure, and can be detachably mounted on a special dust removal piece of an aircraft bleed air system, for example, through threaded connection or welding or screw connection and the like.

Example two: as a further development, either in parallel or alternatively independently, the inlet of the pneumatic conduit 2092 is provided with a sieve 2091. The technical scheme of the invention has the following substantial technical effects and the realization process, namely the basic functions: an inlet end of the pneumatic tube 2092 is fitted with a screen 2091, which functions to reduce the ingress of dust particles into the pneumatic tube 2092.

Example three: as a further modification or in parallel or alternatively independently, the pneumatic conduit 2092 is arranged in the inlet pipe 202 of the axial cyclone 2, which has a flanged edge. The technical scheme of the invention has the following substantial technical effects and the realization process, namely the basic functions: the present embodiment is for automatically controlling a dust collecting process using an air flow.

Example four: as a further improvement scheme or a parallel scheme or an optional independent scheme, the special dust removal part for the aircraft bleed air system is characterized in that the dust removal part is an axial flow type cyclone dust removal device 2, the axial flow type cyclone dust removal device 2 comprises a shell 201, an inlet pipe 202 with a flange edge is arranged on one side of the shell 201, and an exhaust pipe 203 with a flange edge is arranged on the other side of the shell 201; the mouth of the exhaust pipe 203 with the flange edge is provided with a central filter screen 207;

a dust collection box 209 is arranged below the exhaust pipe 203 with a flange edge;

the dust exhaust device also comprises an automatic dust exhaust port, the automatic dust exhaust port comprises an actuating cavity 2098, the middle part of the actuating cavity 2098 comprises an actuating piston 2093, the actuating piston 2093 is connected with a lower dust exhaust valve 2096 through a vertical rod, and the dust exhaust valve 2096 comprises a closed wall inclined inwards; a spring 2094 is disposed below the actuating piston 2093 and on the bottom wall of the actuating chamber 2098; an air pressure conduit 2092 is communicated above the actuating piston 2093; an exhaust pipe 2095 extends out of the side of the actuating cavity 2098; the actuating chamber 2098 is disposed in the dust box 209, and a bottom wall of the dust box 209 includes a mouth portion, i.e., a dust discharge port 2097, and a closing wall of the dust discharge valve 2096 inclined inward can fit the dust discharge port 2097. The technical scheme of the invention has the following substantial technical effects and the realization process, namely the basic functions: the working principle is as follows: when the axial flow type cyclone dust collector 2 works, high-speed airflow enters through the inlet pipe 202 with the flange edge, is guided into the first-stage blade disc from the front end guide area of the guide core body 206 to be deflected, and then enters into the second-stage blade disc to be deflected, so that the flow velocity of the airflow is reduced, and the design requirement is met. Because the bleed air coming out of the middle-high pressure stage of the engine is high-temperature high-pressure high-speed airflow, which exceeds the design range of the common dust removal device, and the high-speed airflow needs to be decelerated, the two-stage fixed blade shown in fig. 2 and 3 can be designed to realize deceleration, and if necessary, the fixed blade can be added to form multi-stage blade deceleration.

It should be noted that, according to the design requirements of the cyclone dust collector, the higher the flow velocity of the gas at the inlet of the dust collector, the higher the centrifugal force of the dust particles in motion can be increased, so that the dust particles are easy to separate, and the dust collection efficiency is improved. The flow velocity of the gas has range requirements, the gas is not easy to be too high, the flow velocity is too high, turbulence is easy to occur, and secondary entrainment is increased to mix dust particles into the separated gas flow again; if the air velocity exceeds a critical value, the effect of turbulence increases more rapidly than the separation action and the dust removal efficiency decreases instead. In addition, too high an air flow velocity also has an adverse effect on pressure loss and the service life of the dust removing device, and therefore the inlet air flow velocity cannot be too high.

The dust removing device shown in fig. 2 and 3 is: the axial flow type cyclone dust removal device 2 is suitable for dust removal of the air entraining system, namely, a dust removal device arranged in a pipeline of the air entraining system.

The housing 201 is connected to an inlet pipe 202 having a flange side and an exhaust pipe 203 having a flange side, respectively, and the exhaust pipe 203 having a flange side extends into the housing 201 to a certain depth. The axial-flow type cyclone dust collector 2 is installed in the bleed air system pipeline through the flange edge of the inlet 202 with the flange edge and the flange edge of the exhaust pipe 203 with the flange edge.

The dust box 209 is located below the housing 201 and is fixed to the housing 201 by welding. The actuation piston 2093 is located inside the actuation chamber 2098, and an outer circumferential surface of the actuation piston 2093 contacts an inner circumferential surface of the actuation chamber 2098, and the actuation piston 2093 can slide up and down along the inner circumferential surface of the actuation chamber 2098. The spring 2094 is located right below the actuating piston 2093, the dust exhaust valve 2096 is located right below the actuating chamber 2098, and a valve rod of the dust exhaust valve 2096 passes through the actuating chamber 2098 and the spring 2094 and then is connected to the actuating piston 2093.

Example five: as a further improvement, or a parallel scheme or an optional independent scheme, the device further comprises a primary blade disc 204 and a secondary blade disc 205, wherein the primary blade disc 204 is composed of a plurality of blades, one end of the primary blade disc 204 is connected with the inner cylindrical surface of the shell 201, and the other end of the primary blade disc 204 is connected with the outer cylindrical surface of the flow guiding core body 206; the secondary blade disc 205 is an integral disc structure, the whole blade disc of the secondary blade disc 205 is fixed on the outer cylindrical surface of the flow guiding core body 206 through a plurality of bolts, and the secondary blade disc 205 is adjacent to the primary blade disc 204. The technical scheme of the invention has the following substantial technical effects and the realization process, namely the basic functions: the first-stage vane disk 204 is formed of a plurality of vanes, one end of which is connected to the inner cylindrical surface of the casing 201 and the other end of which is connected to the outer cylindrical surface of the guide core 206. The second-stage blade disc 205 is an integral disc structure, the whole blade disc is fixed on the outer cylindrical surface of the flow guiding core body 206 through a plurality of bolts, the second-stage blade disc 205 is adjacent to the first-stage blade disc 204 and forms an installation angle with the first-stage blade disc 204 in fig. 2, and the installation position of the second-stage blade disc 205 can be adjusted, namely, designed to be at different positions, so that the installation position and the first-stage blade disc 204 form different angles.

Example six: as a further improvement, or in parallel or alternatively independently, the rear portion of the flow guiding core 206 is connected to the front end portion of the cross vane 208, the rear end portion of the cross vane 208 is connected to the flange edge of the exhaust pipe 203 having the flange edge, the central screen 207 is fixed between the flow guiding core 206 and the cross vane 208, and the central screen 207 takes each ridge of the cross vane 208 as a force bearing area. The technical scheme of the invention has the following substantial technical effects and the realization process, namely the basic functions: the tail part of the guide core body 206 is connected with the front end part of the cross blade 208, the rear end part of the cross blade 208 is connected with the flange edge of the exhaust pipe 203, and the filter screen 207 is fixed between the guide core body 206 and the cross blade 208 and takes each ridge of the cross blade 208 as a stress supporting area. For a specific implementation of this paragraph, reference may be made to fig. 7. The flow guiding core 206 is fixed inside the axial flow type cyclone dust collector 2 through the first-stage blade disc 204 and the cross blades 208, and the central line of the flow guiding core is concentric with the cyclone dust collector 2. The interior of the flow guiding core body 206 is a hollow structure, and both the front end and the tail end have arc flow guiding areas.

Example seven: as a further improvement or in a parallel or optionally independent solution, the crossed blades 208 are fairing blades. The technical scheme of the invention has the following essential technical effects and the realization process, namely, the basic functions: reference may be made to fig. 7.

Example eight: as a further improvement scheme or a parallel scheme or an optional independent scheme, the special dust removing piece is arranged at the outlet end of the middle-high pressure stage compressor of the engine, namely the foremost end of the bleed air system of the engine, and a front dust removing mode is provided for the whole bleed air system. The technical scheme of the invention has the following substantial technical effects and the realization process, namely the basic functions: the axial flow type cyclone dust removing device 2 needs to be installed in a bleed air pipeline, the direction of inlet airflow is consistent with the direction of the airflow in the pipeline, so the axial flow type cyclone dust removing device is named as the axial flow type cyclone dust removing device, the structural schematic diagram of the axial flow type cyclone dust removing device is shown in fig. 2, and the working principle diagram of the axial flow type cyclone dust removing device is shown in fig. 3.

Example nine: as a further improved scheme or a parallel scheme or an optional independent scheme, the special dust removing piece is arranged at the fan end of the engine; and/or special dust removing pieces are respectively arranged at the outlet ends of all stages of the engine. The technical scheme of the invention has the following essential technical effects and the realization process, namely, the basic functions: at the outlet end of the medium-high pressure stage compressor of the engine: a dust removal device is installed at the foremost end of the engine bleed air system, and a front dust removal mode is provided for the whole bleed air system. In addition, a dust removal device can be arranged at the fan end of the engine to provide a front dust removal mode for the cooling air system. The outlet ends of all stages of the engine can be respectively provided with an axial flow type cyclone dust removal device 2, and the first dust removal can be realized in the mode, and the detailed diagram of the device is shown in figure 1.

Example ten: as a further improvement scheme or a parallel scheme or an optional independent scheme, the special dust removing piece is arranged in the bleed air pipeline, the direction of the inlet airflow is consistent with that of the airflow in the pipeline, and the special dust removing piece is an axial-flow type cyclone dust removing device. The technical scheme of the invention has the following essential technical effects and the realization process, namely, the basic functions: the airflow from the second stage blade disc 205 still has a high flow velocity and makes a high-speed circular motion along the inner wall of the casing 201, so as to generate centrifugal force for separating dust particles from the air.

In the interior of the dust removing device, the airflow makes high-speed circular motion around the inner wall surface of the housing 201 and the outer surface of the flow guiding core body 206, and an airflow zone is formed between the two. Due to the centrifugal force, dust particles with a certain mass are thrown to the outer region close to the inner wall of the housing 201, while air with a small mass is thrown to the inner region close to the outer surface of the flow guiding core 206. Since the spatial area between the inner wall surface of housing 201 and the outer surface of flow directing core 206 is relatively small, the pressure will increase; and under the coaction of the inlet airflow pressure, the whole airflow belt is pushed forwards to continue to do circular motion.

It should be noted that: the high temperature of the bleed air also has an effect on the physical properties of the dust-laden gas, and at a given inlet speed, the efficiency of the dust removal device decreases with increasing temperature. Namely: the temperature of the gas increases and the viscosity of the gas increases, so that the greater the centripetal force to which the dust particles are subjected, rather than the greater the centrifugal force, the more separation is facilitated. Therefore, with a larger inlet gas velocity, a smaller cross-sectional gas velocity should be present. Therefore, a relatively large flow guiding core body 206 (shown in fig. 3) is designed in the dust removing device, so that a small cross-sectional gas velocity is obtained.

When the air flow belt moves to the end of the housing 201, the exhaust pipe 203 including the flange due to the dust removing device has a smaller outer diameter than the housing 201. Thus, the outer layer of dust particles in the air flow belt will collide with the housing wall 2010 and will change direction and collide multiple times, eventually falling into the dust bin 209 after the energy is reduced. Wherein, the central filter screen 207 positioned at the outlet can prevent part of dust particles in the mixed flow area of the outlet from being involved in the separated air; in addition, the central screen 207 also serves to prevent larger dust particles, which have not yet been separated due to low air flow velocity, from being blown directly into the downstream system during the initial stage of bleed air and the final stage of bleed air, thereby reducing the degree of contamination of downstream components.

The separated air on the inside will continue to move forward along the aft transition of the inducer core 206, which is unstable and prone to capacity loss due to the fact that the separated air is also rotating, which is not conducive to direct use of downstream bleed air system components. Thus, after passing through the central screen 207, the separated air will reach the cross vanes 208 and be rectified, the rectified air becoming laminar and finally passing through the flanged exhaust duct 203 into the downstream bleed air system components.

Example eleven to example twenty are a second series of protocols: combine fig. 1 with fig. 4 and fig. 5; and fig. 8 and 9;

a second series of protocols: a special dust removal part and an automatic dust discharge port of an airplane air entraining system part;

example eleven: as a further development, or a parallel development or an optional independent development, the automatic dust discharging port of the dust removing part special for the aircraft bleed air system component is characterized in that the automatic dust discharging port comprises a centrifugal cyclone fixing plate 314, the centrifugal cyclone fixing plate 314 comprises a plurality of holes for falling dust, and a circle of reflecting barrier 313 is arranged below the centrifugal cyclone fixing plate 314; the reflecting barrier 313 is of a cone-like structure, and a gap is arranged between the reflecting barrier 313 and the side wall of the centrifugal cyclone dust collector dust collection box 308; a rotating fulcrum 311 is arranged on the side wall of the dust collection box 308 of the centrifugal cyclone dust collector, the rotating fulcrum 311 is a shaft fixed on the side wall of the dust collection box 308 of the centrifugal cyclone dust collector, and the dust collection box also comprises a dust discharge plate 309 of the centrifugal cyclone dust collector which can rotate around the rotating fulcrum 311; the lower part of the dust exhaust plate 309 of the centrifugal cyclone dust collector comprises a centrifugal cyclone dust collector air plate 310 vertical to the dust exhaust plate, the side wall of the dust collection box 308 of the centrifugal cyclone dust collector also comprises a limiting block 312, and the limiting block 312 can limit the rotation limit position of the centrifugal cyclone dust collector air plate 310. The technical scheme of the invention has the following substantial technical effects and the realization process, namely the basic functions: as shown in fig. 4 and 5 and the enlarged view thereof, when the centrifugal cyclone dust collector 3 is in a non-operating state in which the centrifugal cyclone dust collector dust box 308 is in an open state, the bimetal 302 is also in a normal state, i.e., a horizontal position in the drawing. When the centrifugal cyclone dust collector 3 works, the pressure generated by the airflow in the bleed air duct acts on the air plate 310 of the centrifugal cyclone dust collector and forces the dust discharge plate 309 of the centrifugal cyclone dust collector to close, thereby ensuring the normal work of the centrifugal cyclone dust collector 3.

Example twelve: as a further improvement or in parallel or alternatively independently, the centrifugal cyclone holding plate 314 holds the centrifugal cyclone cross vane 307. The technical scheme of the invention has the following essential technical effects and the realization process, namely, the basic functions: the centrifugal cyclone dust collector cross vane 307 can play a role of flow guiding. The centrifugal cyclone dust removal device has the function of rectifying the ascending air flow in the mixing zone through the crossed blade plate 307; the particles drawn into this region form a secondary impact zone which, after impact, rebound to the inner wall of the housing 315 of the centrifugal cyclone and eventually fall into the dust collecting box 308 of the centrifugal cyclone.

Example thirteen: as a further development or in parallel or alternatively independently, a dust removal element specific to a component of an aircraft bleed air system is characterized in that the dust removal element comprises a centrifugal cyclone housing 315, on which centrifugal cyclone housing 315 a centrifugal cyclone inlet duct 306 is arranged, and a vertically arranged centrifugal cyclone outlet duct 304. The technical scheme of the invention has the following essential technical effects and the realization process, namely, the basic functions: when the bleed air system is in operation, the high temperature air stream in the bleed air duct will enter the venturi centrifugal cyclone air inlet duct 306. After passing through the throat of the venturi, the airflow has an increased flow velocity, enters the housing 315 of the centrifugal cyclone dust collector tangentially, and then makes a circular motion along the inner wall of the housing 315 of the centrifugal cyclone dust collector, and the motion trajectory is shown in fig. 5. Since the centrifugal cyclone housing 315 has an inverted conical shape with a large top and a small bottom, the tangential velocity increases as the airflow moves circumferentially along the inner wall of the centrifugal cyclone housing 315 downward. Also due to the separation principle of centrifugal force, fine particles are thrown to the outer region and separated from the air, and the particles rotate along the inner wall of the centrifugal cyclone housing 315 and slide to the bottom. The centrifugal separation device with the inverted cone shape has higher separation efficiency and can separate fine particles of tens of microns or even a few microns.

It should be noted that: as shown in figure 1, the air flow in the bleed air duct passes upstream through a number of bleed air system components in order to reach the location of the bleed air temperature controller 1. Since the upstream bleed air components regulate and control the pressure and temperature of the high-temperature, high-pressure bleed air, the pressure, temperature, and flow rate are reduced considerably. The reduction in the parameters at the location of the bleed air temperature controller 1 is about half compared to the location of the axial flow cyclone 2 in fig. 1. Even so, the bleed air temperature controller 1 is reached at a pressure of about 320kPa, a temperature of about 200 c and a flow rate of about 20-30 m/s. But a relatively large drop in both pressure and flow rate occurs if a bleed air system malfunction, such as a bleed air pressure surge, occurs. Therefore, in order to obtain a better separation effect and prevent the influence of the fluctuation of the bleed air, the centrifugal cyclone air intake pipe 306 of the centrifugal cyclone 3 is designed in a venturi shape, and the flow velocity of the air flow can be increased appropriately, so that a larger centrifugal force can be obtained.

When the airflow reaches the bottom of the cyclone housing 315 it is diverted from the downdraft to the updraft, in the process there may be a mixing zone in the bottom region, since this region is where the airflow is diverted and is the necessary way for the separated particles to fall into the cyclone bin 308. Therefore, the separated fine particles may be again entrained in the ascending gas flow; and this phenomenon is more pronounced as the bottom area is smaller. Therefore, the centrifugal cyclone dust collector 3 has a large bottom area, so that the distance between the outer layer particles and the inner layer airflow is large. And also a centrifugal cyclone cross vane 307 is installed at the bottom.

The rectified updraft is in a laminar state, namely: interference between the separated airflow and the outer-layer sinking airflow is not easy to occur during ascending and before the separated airflow reaches the exhaust pipe 304 of the centrifugal cyclone dust collector, so that the condition that the separated airflow is not involved in particles in the sinking airflow during ascending is prevented.

Example fourteen: as a further improvement or a parallel solution or an alternative independent solution, a centrifugal cyclone filter screen I303 is arranged above the exhaust pipe 304 of the centrifugal cyclone dust removal device. The technical scheme of the invention has the following substantial technical effects and the realization process, namely the basic functions: the bleed air reaches the point where the bleed air temperature controller 1 is located at a temperature of approximately 200 c. The bimetal 302 will exhibit corresponding characteristics under the influence of the gas temperature, and will bend to the side with the smaller expansion coefficient. When the temperature drops after the end of the bleed air, to a temperature at which the bimetal 302 resets again, the ability of the bimetal 302 to store is released instantaneously. The bimetal blade 302 will spring back to the horizontal position. At this time, the small hammerheads on the 2 bimetallic strips 302 knock on the first filter screen 303 of the centrifugal cyclone dust collector and shake down particles possibly adsorbed on the first filter screen 303 of the centrifugal cyclone dust collector, so that the particles are prevented from being aggregated, a good ventilation effect is ensured, and a sufficient air volume is provided for the air filter screen 101.

Example fifteen: as a further development or in parallel or alternatively independently, a bimetallic strip 302 is arranged above the first centrifugal cyclone screen 303. The technical scheme of the invention has the following substantial technical effects and the realization process, namely the basic functions: this implementation is described with reference to example fourteen.

Example sixteen: as a further development or a parallel development or an optional independent development, the centrifugal cyclone dust collector casing 315 comprises an adapter sleeve 301 at the top, and the adapter sleeve 301 comprises a screw thread and is connected with the casing screw thread mounting hole of the bleed air temperature controller 1 through the adapter sleeve 301; the centrifugal cyclone dust removal device and the bleed air temperature controller 1 are both positioned in the bleed air system. The technical scheme of the invention has the following substantial technical effects and the realization process, namely the basic functions: and a dust removal device is arranged at the air-entraining end of the related part of the air-entraining system, so that a preposed dust removal mode is provided for the part of the air-entraining system. The secondary dust removal can be realized by installing a centrifugal cyclone dust removal device 3 at the air-entraining end of an air filter screen 101 of the air-entraining temperature controller, and the detailed drawing of the device is shown in figure 4.

The centrifugal cyclone dust collector 3 is required to be installed on the bleed air system components, such as: the air-entraining end, the inlet airflow direction and the airflow direction in the pipeline of the air-filtering net of the air-entraining temperature controller are vertical, so the centrifugal cyclone dust collector is named, the structural schematic diagram of the centrifugal cyclone dust collector is shown in figure 4, and the working principle diagram of the centrifugal cyclone dust collector is shown in figure 5. A centrifugal cyclone dust removal device 3 suitable for removing dust from bleed air system components, i.e. a dust removal device which is mounted on bleed air system components. The centrifugal cyclone dust collector 3 is installed above the bleed air temperature controller 1 and is used for protecting the air filter screen 101 from serious pollution of dust particles in the air. The centrifugal cyclone dust collector 3 is connected with the adapter sleeve 301 through threads on the top of a shell 315 of the centrifugal cyclone dust collector, and the adapter sleeve 301 is connected with a shell thread mounting hole of the bleed air temperature controller 1 through the threads on the top.

The dust collection box 308 of the centrifugal cyclone dust collector is located at the bottom of the housing 315 of the centrifugal cyclone dust collector and is used for collecting separated dust particles. The centrifugal cyclone fixing plate 314 is located between the centrifugal cyclone housing 315 and the centrifugal cyclone dust-collecting case 308, and the centrifugal cyclone cross vane 307 is installed at the center of the centrifugal cyclone fixing plate 314.

The dust exhausting plate 309 of the centrifugal cyclone dust collector can rotate around a rotation fulcrum 311, and the rotation angle of the dust exhausting plate is limited by a limiting block 312. The centrifugal cyclone air plate 310 is fixed on the centrifugal cyclone dust exhaust plate 309. When the bleed air system is in operation, the pressure of the air flow generated by the air flow in the bleed air duct acts on the centrifugal cyclone damper flap 310 and forces the centrifugal cyclone damper flap 309 closed, ensuring proper operation of the centrifugal cyclone 3, as shown in the enlarged view in fig. 5.

The exhaust pipe 304 of the centrifugal cyclone dust collector is positioned right below the first filter screen 303 of the centrifugal cyclone dust collector, is connected with the top end of the shell 315 of the centrifugal cyclone dust collector, and extends into the shell 315 of the centrifugal cyclone dust collector. The centrifugal cyclone exhaust 304 is concentric with the centrifugal cyclone housing 315, and the exhaust outlet of the centrifugal cyclone exhaust 304 is located slightly below the lowest position of the centrifugal cyclone inlet 306.

Example seventeen: as a further improvement or a parallel scheme or an optional independent scheme, the number of the bimetallic strips 302 is two, the bimetallic strips 302 are symmetrical left and right, and the tail end of each bimetallic strip is respectively provided with a small metal hammer. The technical scheme of the invention has the following essential technical effects and the realization process, namely, the basic functions: and oscillating in coordination with the gas flow. As shown in the enlarged view of fig. 5, the bimetallic strip 302 and the first centrifugal cyclone dust collector filter screen 303 are fixed below the adaptor sleeve 301, the number of the bimetallic strips 302 is two, the bimetallic strips are symmetrical left and right, and the tail end of each bimetallic strip 302 is provided with a small metal hammer. The first filter screen 303 of the centrifugal cyclone dust collector is a superfine metal filter screen.

Example eighteen: as a further improvement scheme or a parallel scheme or an optional independent scheme, the exhaust pipe 304 of the centrifugal cyclone dust collector is positioned right below the first filter screen 303 of the centrifugal cyclone dust collector, is connected with the top end of the shell 315 of the centrifugal cyclone dust collector, and extends into the shell 315 of the centrifugal cyclone dust collector; the centrifugal cyclone exhaust pipe 304 is concentric with the centrifugal cyclone housing 315, and the exhaust port of the centrifugal cyclone exhaust pipe 304 is located slightly lower than the lowest position of the centrifugal cyclone intake pipe 306. The technical scheme of the invention has the following substantial technical effects and the realization process, namely the basic functions: the inlet side of the inlet duct 306 of the centrifugal cyclone is fitted with a second centrifugal cyclone screen 305 which serves to screen off dust particles remaining in the bleed air and to prevent wear or debris from the upstream bleed air system components which may have failed or have worked abnormally from entering the inlet duct 306 of the centrifugal cyclone. The inlet duct 306 of the centrifugal cyclone is tangentially connected to the top end of the housing 315 of the centrifugal cyclone, and functions to generate a swirling air flow and a centrifugal force.

Example nineteenth: as a further modification, either in parallel or alternatively independently, the inlet tube 306 of the centrifugal cyclone is venturi shaped. The technical scheme of the invention has the following substantial technical effects and the realization process, namely the basic functions: the inlet duct 306 of the centrifugal cyclone is in the shape of a venturi and functions to increase the flow rate of the air flow.

Example twenty: as a further development or in a side-by-side or alternatively independent solution, the bimetal 302 is a resilient metal plate. The technical scheme of the invention has the following essential technical effects and the realization process, namely, the basic functions: the elastic metal sheet can assist in generating vibration and can remove dust.

The reflection shield 313 is located in the centrifugal cyclone dust collector dust box 308 and fixed below the centrifugal cyclone dust collector fixing plate 314. The reflecting screen 313 is installed obliquely, and has a gap with the inner wall of the dust box 308 of the centrifugal cyclone dust collector. The gap allows the separated dust particles to fall into the dust collection box 308 of the centrifugal cyclone dust collector after passing through the hole of the fixing plate 314 of the centrifugal cyclone dust collector, and can also prevent the cyclone flow in the dust collection box 308 of the centrifugal cyclone dust collector from winding the separated dust particles into the air flow again, thereby forming a barrier. When the bleed air is finished and the bleed air flow disappears, the dust discharging plate 309 of the centrifugal cyclone dust collector is opened under the action of gravity and dust is discharged. When the air-entraining system works, the centrifugal cyclone dust removal device 3 circularly works according to the working principle to automatically remove dust and automatically exhaust dust for the components of the air-entraining system.

The dust removal principle of the two dust removal modes is centrifugal dust removal, the corresponding dust removal effect can be realized, and the influence of the pollution of dust particles in the air on the parts of the air entraining system can be reduced, so that the fault frequent probability of the parts of the air entraining system is reduced, and the punctuality rate and flight safety of flights are guaranteed. Due to the fact that the failure rate is reduced, the service time of the parts is prolonged, the service life of the parts is prolonged, the cost of aviation materials can be saved, and more economic benefits are brought to an airline company.

Corresponding dust removal effect can all be realized to these two kinds of dust removal modes, in addition, in view of the influence of the dirt particle in the air to bleed air system and bleed air system part, the higher actual conditions of dust index in can being according to the air of china when designing the bleed air system and the bleed air system part of novel big aircraft of china, and consider the reference the utility model discloses well relevant case adds leading dust collector in bleed air system and the bleed air system part, reduces the fault rate, promotes the reliability of bleed air system to bring deeper beneficial effect.

Creatively, the above effects exist independently, and the combination of the above results can be completed by a set of structure.

It should be noted that the plurality of schemes provided in this patent include their own basic schemes, which are independent of each other and are not restricted to each other, but they may be combined with each other without conflict, so as to achieve a plurality of effects.

The foregoing shows and describes the general principles, principal features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined by the appended claims.

Claims (10)

1. The automatic dust discharging port of the special dust removing part for the aircraft bleed air system is characterized by comprising an actuating cavity (2098), the middle part of the actuating cavity (2098) comprises an actuating piston (2093), the actuating piston (2093) is connected with a lower dust discharging valve (2096) through a vertical rod, and the dust discharging valve (2096) comprises a closed wall inclined inwards; springs (2094) are arranged below the actuating piston (2093) and on the bottom wall of the actuating chamber (2098); the upper part of the actuating piston (2093) is communicated with a pneumatic conduit (2092); an exhaust pipe (2095) extends out of the side of the actuating cavity (2098); the actuating cavity (2098) is arranged in the dust collection box (209), the bottom wall of the dust collection box (209) comprises an opening part, namely a dust discharge opening (2097), and a closed wall of the dust discharge valve (2096) which inclines inwards can be matched with the dust discharge opening (2097).

2. An automatic dust removal for aircraft bleed air systems according to claim 1, characterised in that the inlet of the pneumatic conduit (2092) is provided with a filter screen (2091).

3. The automatic dust removal for aircraft bleed air systems according to claim 1, characterised in that the pneumatic conduit (2092) is arranged in the flanged inlet pipe (202) of the axial cyclone (2).

4. The special dust removal part for the aircraft bleed air system is characterized in that the dust removal part is an axial flow type cyclone dust removal device (2), the axial flow type cyclone dust removal device (2) comprises a shell (201), an inlet pipe (202) with a flange edge is arranged on one side of the shell (201), and an exhaust pipe (203) with a flange edge is arranged on the other side of the shell (201); a central filter screen (207) is arranged at the opening part of the exhaust pipe (203) with the flange edge;

a dust collection box (209) is arranged below the exhaust pipe (203) close to the flange edge;

the dust removal device also comprises an automatic dust removal port, the automatic dust removal port comprises an actuating cavity (2098), the middle part of the actuating cavity (2098) comprises an actuating piston (2093), the actuating piston (2093) is connected with a dust removal valve (2096) below through a vertical rod, and the dust removal valve (2096) comprises a closed wall inclined inwards; springs (2094) are arranged below the actuating piston (2093) and on the bottom wall of the actuating chamber (2098); the upper part of the actuating piston (2093) is communicated with a pneumatic conduit (2092); an exhaust pipe (2095) extends out of the side of the actuating cavity (2098); the actuating cavity (2098) is arranged in the dust collection box (209), the bottom wall of the dust collection box (209) comprises an opening part, namely a dust discharge opening (2097), and the closing wall of the dust discharge valve (2096) which is inclined inwards can be matched with the dust discharge opening (2097).

5. The dust removal element special for the aircraft bleed air system according to claim 4, characterized by further comprising a primary blade disc (204) and a secondary blade disc (205), wherein the primary blade disc (204) is composed of a plurality of blades, one end of the primary blade disc (204) is connected with the inner cylindrical surface of the shell (201), and the other end of the primary blade disc (204) is connected with the outer cylindrical surface of the flow guide core body (206); the secondary blade disc (205) is of an integral disc structure, the whole blade disc of the secondary blade disc (205) is fixed on the outer cylindrical surface of the flow guide core body (206) through a plurality of bolts, and the secondary blade disc (205) is adjacent to the primary blade disc (204).

6. The dust removal element special for the aircraft bleed air system according to claim 5, characterized in that the tail part of the flow guiding core body (206) is connected with the front end part of the cross blade (208), the rear end part of the cross blade (208) is connected with the flange edge of the exhaust pipe (203) with the flange edge, the central filter screen (207) is fixed between the flow guiding core body (206) and the cross blade (208), and the central filter screen (207) takes each ridge of the cross blade (208) as a stress supporting area.

7. An aircraft bleed air system specific dusting piece according to claim 6, characterised in that the cross blades (208) are fairing blades.

8. A special dust removal element for aircraft bleed air systems according to any one of claims 4 to 7, characterised in that the special dust removal element is mounted at the outlet end of the intermediate and high pressure stage compressor of the engine, i.e. at the foremost end of the bleed air system of the engine, and provides a pre-dedusting mode for the entire bleed air system.

9. An aircraft bleed air system specific dust removal element according to any one of claims 4 to 7, characterised in that the specific dust removal element is mounted at the fan end of the engine; and/or special dust removing pieces are respectively arranged at the outlet ends of all stages of the engine.

10. An aircraft bleed air system-specific dust removal element as claimed in any one of claims 4 to 7, wherein the dedicated dust removal element is mounted in the bleed air duct in such a way that the direction of the inlet air flow coincides with the direction of the air flow in the duct and is an axial-flow cyclonic dust removal device.

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