A bleed air conversion device for adjusting the bleed air position of an aircraft engine

Abstract

A bleed air conversion device for adjusting the bleed air position of an aero-engine includes a first bleed air port on the left end face A of the housing, a second bleed air port on the right end face B, and an air outlet in the middle. The first bleed air port, the second bleed air port, and the air outlet are all connected to the inner cavity of the housing. Two support ribs are spaced apart in the inner cavity of the housing. A movable rod is slidably inserted through the support ribs, and both ends of the movable rod extend to the positions of the first bleed air port and the second bleed air port, respectively. The device also includes a drive mechanism for driving the movable rod to slide left and right. A first sealing body is located at the position of the first bleed air port and fixed to the end of the movable rod, for following the movement of the movable rod and sealing or opening the first bleed air port. A second sealing body is located at the position of the second bleed air port and fixed to the end of the movable rod, for following the movement of the movable rod and sealing or opening the second bleed air port.

Description

Technical Field

[0001] This invention relates to the field of aero-engine air system technology, and in particular to a bleed air conversion device structure for adjusting the bleed air position of an aero-engine. Background Technology

[0002] In aero engines, to ensure the reliable and stable operation of the engine lubrication system, it is necessary to maintain sufficiently stable pressure and suitable temperature in the sealing chamber within its envelope. This means that when the engine is at high altitude and low speed, air needs to be drawn from the fifth-stage compressor to the engine oil pre-lubricating chamber for oil sealing; when the engine is at medium and low altitude and high speed, the flow switches to drawing air from the fan unloading chamber to the engine oil pre-lubricating chamber for sealing.

[0003] Existing bleed air conversion devices have relatively limited bleed air functionality, only able to introduce airflow from the fifth-stage compressor or from the fan unloading chamber. They cannot meet the requirement of introducing airflow from both the fifth-stage compressor and the fan unloading chamber. Furthermore, existing aero-engine bleed air locations require multiple bleed air conversion devices to meet bleed air requirements. Summary of the Invention

[0004] The main objective of this invention is to provide an bleed air conversion device for adjusting the bleed air position of an aero-engine, thereby solving the aforementioned technical problems.

[0005] To achieve the above objectives, the present invention proposes an air bleed position adjustment device for aero-engines, comprising a housing, a movable rod, a first sealing body, a second sealing body, and a support rib.

[0006] A first air intake is provided on the left end face A of the shell, and a second air intake is provided on the right end face B; an air outlet is provided in the middle of the shell; the first air intake, the second air intake, and the air outlet are all connected to the inner cavity of the shell.

[0007] Two support ribs are spaced apart in the inner cavity of the shell. The movable rod is slidably inserted through the support ribs, and the two ends of the movable rod extend to the positions of the first air inlet and the second air inlet, respectively.

[0008] It also includes a drive mechanism for driving the movable rod to slide left and right;

[0009] The first sealing body is located at the first air inlet and is fixed to the end of the movable rod, and is used to follow the movement of the movable rod to block or open the first air inlet;

[0010] The second sealing element is located at the second air inlet and is fixed to the end of the movable rod. It is used to follow the movement of the movable rod and to block or open the second air inlet.

[0011] Preferably, the drive mechanism includes a rotating shaft, a gear mounted on the rotating shaft, and a toothed block positioned at the center of the movable rod; one end of the drive shaft extends through the inner cavity of the housing and is connected to a power source, while the other end is rotatably connected to the inner wall of the housing; the gear meshes with the toothed block for transmission.

[0012] Preferably, the height of the tooth block is the same as the height of the gear, and the height of the tooth block is greater than the diameter of the movable rod.

[0013] Preferably, the walls of the first air intake and the second air intake are both concave hemispherical surfaces, and the outer surfaces of the first sealing body and the second sealing body are hemispherical surfaces; when sealing, the hemispherical surface of the sealing body matches the hemispherical surface of the air intake.

[0014] Preferably, both the first sealing body and the second sealing body have concave hemispherical surfaces on their outer end faces, so that the first sealing body and the second sealing body form a bowl-shaped structure.

[0015] Preferably, the supporting rib is a semi-circular plate structure, and the cylindrical surface of the supporting rib is connected to the inner wall surface of the shell.

[0016] Preferably, the two ends of the housing are square plate structures, and connection holes are provided at the four corners of the square plates.

[0017] Preferably, the shell is formed by welding square plates at both ends to a cylindrical body in the middle.

[0018] Preferably, a square boss is provided on the outer wall surface of the middle cylinder of the shell, the air outlet is provided on the square boss, and a connecting hole is provided at the four corners of the square boss.

[0019] Preferably, the square boss and the cylindrical body in the middle of the shell are integrally formed.

[0020] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0021] (1) The bleed air conversion device provided by the present invention has two bleed air ports on the housing, and a driving mechanism drives a movable rod to slide left and right, thereby driving a sealing body to block or open the bleed air ports. Specifically, when the aircraft engine needs to change the bleed air position, the structure of this bleed air conversion device effectively utilizes a simple mechanical structure to open the first bleed air port on the left end face A while closing the second bleed air port on the right end face B; or to open the second bleed air port on the right end face B while closing the first bleed air port on the left end face A; or to open both the first and second bleed air ports simultaneously. This satisfies the function of introducing airflow from the 5th stage compressor and airflow from the fan unloading chamber.

[0022] (2) The bleed air conversion device provided by the present invention has a simple structure, stable function, strong sealing ability, and low installation cost. One bleed air conversion device can meet the bleed air requirements, effectively reducing the counterweight. The original bleed air conversion position does not need to be changed too much. It can ensure that the required airflow is reliably and stably introduced, thereby realizing the reliable and stable operation of the engine lubrication system. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 A three-dimensional structural schematic diagram of the air intake conversion device provided by the present invention;

[0025] Figure 2 This is a cross-sectional view of the air intake conversion device provided by the present invention;

[0026] Figure 3 This is another cross-sectional view of the air conversion device provided by the present invention.

[0027] Explanation of reference numerals: 1-Housing shell; 101-First air intake port; 102-Second air intake port; 103-Air outlet; 104-Square boss; 2-Moving rod; 201-Gear block; 301-First sealing body; 302-Second sealing body; 4-Supporting rib; 5-Rotating shaft; 501-Gear. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0029] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0030] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0031] Combination Figures 1 to 3 The diagram shows a specific implementation structure of an air bleed position adjustment device for an aero-engine provided by the present invention. The air bleed position adjustment device includes a housing 1, a movable rod 2, a first sealing body 301, a second sealing body 302, and a support rib 4.

[0032] A first air inlet 101 is provided on the left end face A of the housing 1, and a second air inlet 102 is provided on the right end face B; an air outlet 103 is provided in the middle of the housing 1; the first air inlet 101, the second air inlet 102, and the air outlet 103 are all connected to the inner cavity of the housing 1.

[0033] Two supporting ribs 4 are spaced apart in the inner cavity of the housing 1. The movable rod 2 is slidably inserted through the supporting ribs 4, and the two ends of the movable rod 2 extend to the positions of the first air inlet 101 and the second air inlet 102, respectively. It also includes a driving mechanism for driving the movable rod 2 to slide left and right.

[0034] The first sealing body 301 is located at the first air inlet 101 and is fixed to the end of the movable rod 2. It is used to follow the movement of the movable rod 2 and to block or open the first air inlet 101.

[0035] The second sealing body 302 is located at the second air inlet 102 and is fixed to the end of the movable rod 2. It is used to follow the movement of the movable rod 2 and to block or open the second air inlet 102.

[0036] Combination Figure 2 As shown, the air intake conversion device provided by the present invention has the following three states for opening and closing the air intake port:

[0037] In the first scenario, the moving rod 2 is driven to move to the right end face B by the drive device. At this time, the first sealing body 301 at the left end face A blocks the first air intake port 101, and the second sealing body 302 at the right end face B opens the second air intake port 102. The second air intake port 102 is used to introduce the airflow after the 5th stage compressor to the engine lubricating oil pre-seal chamber for lubricating oil sealing.

[0038] The second situation is that the moving rod 2 is driven to move to the left end face A by the driving device. At this time, the second sealing body 302 at the right end face B blocks the second air intake 102, and the first sealing body 301 at the left end face A opens the first air intake 101. The first air intake 101 is used to introduce the airflow from the fan unloading chamber to the engine lubricating oil pre-sealment chamber for lubricating oil sealing.

[0039] The third situation is that when the movable lever 2 is in the middle position, both the first air intake 101 and the second air intake 102 are in the open state, and at the same time, the airflow after the fifth stage compressor and the airflow of the fan unloading chamber are introduced to the engine lubricating oil pre-seal chamber for lubricating oil sealing.

[0040] The air intake conversion device provided by this invention satisfies the function of both introducing airflow from the 5th stage compressor and introducing airflow from the fan unloading chamber.

[0041] Combination Figure 2 and Figure 3 As shown, the drive mechanism includes a rotating shaft 5, a gear 501 mounted on the rotating shaft 5, and a toothed block 201 positioned in the middle of the movable rod 2. One end of the drive shaft 5 extends through the inner cavity of the housing 1 and is connected to a power source, while the other end is rotatably connected to the inner wall of the housing 1. The power source can be a motor, etc. The gear 501 meshes with the toothed block 201 for transmission. Using the meshing transmission method of the gear 501 and the toothed block 201 results in a simple transmission structure. Furthermore, the opening degree of the first sealing body 301 and the second sealing body 302 can be controlled by controlling the rotation angle of the drive shaft 5.

[0042] Combination Figure 2 As shown, the height of the tooth block 201 is the same as the height of the gear 501. Using the same height serves two purposes: firstly, it increases the contact length between the tooth block 201 and the gear 501, ensuring smooth meshing; secondly, since the height of the tooth block 201 is greater than the diameter of the movable rod 2, it increases the longitudinal contact distance between the tooth block 201 and the gear 501, effectively preventing the movable rod 2 from rotating around its own axis.

[0043] Combination Figure 2 As shown, the walls of the first air intake 101 and the second air intake 102 are both concave hemispherical surfaces, and the outer surfaces of the first sealing body 301 and the second sealing body 302 are hemispherical surfaces. When sealing, the hemispherical surface of the sealing body matches the hemispherical surface of the air intake. Using a spherical matching method during sealing can achieve a better sealing effect.

[0044] Furthermore, concave hemispherical surfaces are provided on the outer end faces of both the first sealing body 301 and the second sealing body 302, forming a bowl-shaped structure. The concave hemispherical surfaces on the end faces of the first sealing body 301 and the second sealing body 302 form a wind-catching structure. The airflow at the left end face A and the right end face B can act on the wind-catching structure. When the first sealing body 301 and the second sealing body 302 are blocking, the force generated by the airflow acting on the wind-catching structure can push the sealing body tightly against the spherical surface of the air intake, ensuring the sealing effect of the air intake.

[0045] Combination Figure 2 , Figure 3 As shown, the support rib 4 is a semi-circular plate structure, and the cylindrical surface of the support rib 4 is connected to the inner wall surface of the shell 1. The semi-circular support rib 4 can provide sliding support for the movable rod 2, and the arc edge can cooperate with the inner wall surface of the shell 1.

[0046] Combination Figure 1 As shown, the two end faces of the housing 1 are square plate structures, with connecting holes at the four corners of the square plates. The housing 1 is welded from the square plates at both end faces to the central cylindrical body, employing a welded structure to ensure the sealing performance of the welded joints. The square plate structure at both end faces of the housing 1 and the connecting holes facilitate the installation of the entire bleed air conversion device. Furthermore, a square boss 104 is provided on the outer wall of the central cylindrical body of the housing 1, and the air outlet 103 is located on this square boss 104. Connecting holes are provided at the four corners of the square boss 104; the square boss 104 facilitates connection with corresponding components on the aero-engine. The square boss 104 and the central cylindrical body of the housing 1 are integrally formed, employing a one-piece molding process, resulting in a simple structure.

[0047] The working principle of the air intake conversion device provided by this invention is as follows:

[0048] When the aircraft engine is in a high-altitude, low-speed state, the gear 501 and the tooth block 201 mesh and drive the movable rod 2 to move to the right end face B. At this time, the first sealing body 301 at the left end face A blocks the first air intake 101, and the second sealing body 302 at the right end face B opens the second air intake 102. The second air intake 102 introduces the airflow after the 5th stage compressor to the engine lubricating oil pre-cavity for lubricating oil sealing.

[0049] When the aircraft is in a medium- or low-altitude high-speed state, the bleed air conversion device performs bleed air conversion. The gear 501 and the tooth block 201 mesh and drive the movable rod 2 to move to the left end face A. At this time, the second sealing body 302 at the right end face B blocks the second bleed air port 102, and the first sealing body 301 at the left end face A opens the first bleed air port 101. The first bleed air port 101 introduces the airflow from the fan unloading chamber to the engine lubricating oil front chamber for lubricating oil sealing.

[0050] Under certain special conditions of the engine, when the movable lever 2 is in the middle position, the first bleed air port 101 and the second bleed air port 102 can be bleed air at the same time, and the airflow after the fifth stage compressor and the airflow of the fan unloading chamber can be introduced into the engine lubricating oil pre-sealment chamber for lubricating oil sealing.

[0051] Therefore, the temperature and pressure of the engine oil pre-containment chamber can be kept in a reliable and stable state, ensuring the reliable and stable operation of the engine lubrication system.

[0052] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A bleed air conversion device for adjusting the bleed air position of an aero-engine, characterized in that, It includes a housing (1), a movable rod (2), a first sealing body (301), a second sealing body (302), and a support rib (4); A first air inlet (101) is provided on the left end face A of the housing (1), and a second air inlet (102) is provided on the right end face B; an air outlet (103) is provided in the middle of the housing (1); the first air inlet (101), the second air inlet (102), and the air outlet (103) are all connected to the inner cavity of the housing (1); Two supporting ribs (4) are spaced apart in the inner cavity of the shell (1). The supporting ribs (4) are semi-circular plate structures, and the cylindrical surface of the supporting ribs (4) is connected to the inner wall surface of the shell (1). The movable rod (2) is slidably inserted on the supporting ribs (4), and the two ends of the movable rod (2) extend to the positions of the first air inlet (101) and the second air inlet (102), respectively. It also includes a drive mechanism for driving the movable rod (2) to slide left and right; the drive mechanism includes a rotating shaft (5), a gear (501) set on the rotating shaft (5), and a tooth block (201) set in the middle of the movable rod (2); the height of the tooth block (201) is the same as the height of the gear (501), and the height of the tooth block (201) is greater than the diameter of the movable rod (2); one end of the rotating shaft (5) passes through the inner cavity of the housing (1) and is connected to the power source, and the other end is rotatably connected to the inner wall of the housing (1); the gear (501) meshes with the tooth block (201) for transmission; by controlling the rotation angle of the drive shaft (5), the opening degree of the first sealing body (301) and the second sealing body (302) is controlled; The first sealing body (301) is located at the first air inlet (101) and is fixed to the end of the movable rod (2) for following the movement of the movable rod (2) and sealing or opening the first air inlet (101); The second sealing body (302) is located at the second air inlet (102) and is fixed to the end of the movable rod (2) for following the movement of the movable rod (2) and sealing or opening the second air inlet (102); The walls of the first air intake (101) and the second air intake (102) are both concave hemispherical surfaces, and the outer surfaces of the first sealing body (301) and the second sealing body (302) are hemispherical surfaces. When sealing, the hemispherical surface of the sealing body matches the hemispherical surface of the air intake. The outer end faces of the first sealing body (301) and the second sealing body (302) are provided with concave hemispherical surfaces, so that the first sealing body (301) and the second sealing body (302) form a bowl-shaped structure, and the concave hemispherical surfaces on the outer end faces of the first sealing body (301) and the second sealing body (302) form a wind-catching structure. Drive the movable rod (2) to move to the right end face B by the drive device. At this time, the first sealing body (301) at the left end face A will block the first air intake (101), and the second sealing body (302) at the right end face B will open the second air intake (102). The second air intake (102) is used to introduce the airflow after the 5th stage compressor to the engine lubricating oil pre-seal chamber for lubricating oil sealing. Drive the movable rod (2) to move to the left end face A by the drive device. At this time, the second sealing body (302) at the right end face B will block the second air vent (102), and the first sealing body (301) at the left end face A will open the first air vent (101). The first air vent (101) is used to introduce the airflow from the fan unloading chamber to the engine lubricating oil pre-seal chamber for lubricating oil sealing. When the movable lever (2) is in the middle position, the first air intake (101) and the second air intake (102) are both in the open state, and at the same time, the airflow after the fifth stage compressor and the airflow of the fan unloading chamber are introduced to the engine lubricating oil front chamber for lubricating oil sealing.

2. The bleed air conversion device for adjusting the bleed air position of an aero-engine as described in claim 1, characterized in that, The two ends of the shell (1) are square plate structures, and connection holes are provided at the four corners of the square plates.

3. The bleed air conversion device for adjusting the bleed air position of an aero-engine as described in claim 2, characterized in that, The shell (1) is formed by welding square plates at both ends and a cylindrical body in the middle.

4. The bleed air conversion device for adjusting the bleed air position of an aero-engine as described in claim 3, characterized in that, A square boss (104) is provided on the outer wall of the middle cylinder of the shell (1), and the air outlet (103) is provided on the square boss (104). Connecting holes are provided at the four corners of the square boss (104).

5. The bleed air conversion device for adjusting the bleed air position of an aero-engine as described in claim 4, characterized in that, The square boss (104) and the cylinder in the middle of the shell (1) are integrally formed.

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