A compact linkage adjustable bleed mechanism for an aeroengine

Abstract

The application discloses a compact linkage adjustable bleeding mechanism of an aero-engine, comprising: an electric push-pull rod, one end of which is fixed, and the other end of which is connected with the rear side of a bleeding linkage ring, and the axis of the electric push-pull rod is parallel to the axis of the bleeding linkage ring; a plurality of groove pin pair structures, which are arranged at equal intervals on the bleeding linkage ring; a bleeding cover plate, which is rotatably installed on the groove pin pair structure and the axial flow stator casing and is located outside the stator casing bleeding hole; a conical surface of the bleeding cover plate is used for pressing and sealing with the casing sealing structure of the stator casing bleeding hole; through the synchronous extension and contraction of the plurality of electric push-pull rods, the bleeding linkage ring and the plurality of groove pin pair structures are synchronously moved, so that the stator casing bleeding hole is opened or closed or the opening degree of the stator casing bleeding hole is adjusted. The application can reduce the axial space occupation, facilitate the integrated arrangement in the narrow casing space of the aero-engine, and has the advantages of simple structure, accurate control, rapid response and reliable sealing reliability under long-term high-temperature working conditions.

Description

Technical Field

[0001] This invention relates to the field of aero-engine technology, specifically to a compact, linked, and adjustable venting mechanism for aero-engines. Background Technology

[0002] The bleed gas mechanism of an aero-engine is an effective measure to improve the stable operating range of the engine and is widely used in high-pressure-ratio turbine engines. Currently, conventional turbine engine bleed gas mechanisms employ a structure combining a gas collection chamber and a linked bleed gas valve. To achieve the linkage of the bleed gas valve, the force transmission path of the mechanism is usually designed to be complex, resulting in an increase in moving parts, high system resistance during mechanism movement, and reduced reliability. At the same time, the complex structural design increases the overall size and weight of the mechanism, making it difficult to arrange on the engine. Therefore, there is an urgent need for an adjustable bleed gas mechanism for aero-engines that has a simple structure, compact space arrangement, and high reliability. Summary of the Invention

[0003] To address the aforementioned technical problems, the present invention aims to provide a compact, adjustable, and linked venting mechanism for aero-engines. This mechanism has a simple structure, can meet the reliability requirements of venting valve linkage, and effectively control size and weight.

[0004] The present invention solves the above problems through the following technical solution:

[0005] A compact, linked, adjustable venting mechanism for an aircraft engine, comprising:

[0006] An electric push-pull rod mounting base is fixedly installed on the axial flow stator casing;

[0007] At least two electric push-pull rods, one end of which is fixed to the electric push-pull rod mounting base;

[0008] The other end of the electric push-pull rod is connected to the rear side of the venting linkage ring, and the axis of the electric push-pull rod is parallel to the axis of the venting linkage ring.

[0009] Multiple slotted pin structures are equally spaced on the front side of the venting linkage ring;

[0010] Multiple venting covers are provided, each venting cover being rotatably mounted on a corresponding slotted pin pair structure. Each venting cover has a connecting end and a closing end. The connecting end has a fixed shaft and lugs on both sides of the connecting end. The fixed shaft is used for sliding connection with the slotted pin pair structure, and the lugs are used for hinged installation of the venting cover onto the axial flow stator casing and located outside the stator casing vent hole of the axial flow stator casing. The closing end has a conical surface for pressing and sealing against the casing sealing structure of the stator casing vent hole.

[0011] By synchronously extending and retracting at least two electric push-pull rods, the venting linkage ring and multiple slotted pin pairs located on the venting linkage ring move synchronously. Under the connection between the slotted pin pairs and the axial flow stator casing, the multiple venting covers rotate relative to the axial flow stator casing and slide within the slotted pin pairs. This achieves the matching control of the conical surface of the venting cover with the casing sealing structure of the venting hole of the stator casing, so as to open or close the venting hole of the stator casing or adjust the opening degree of the venting hole of the stator casing.

[0012] As a further improvement of the present invention, after the electric push-pull rod is inserted into the venting linkage ring, it is then fixed by fixing bolts.

[0013] As a further improvement of the present invention, the slotted pin pair structure includes a slotted pin pair base, two slotted pin pair covers, and two slotted pin pair bearings; the slotted pin pair base is a U-shaped structure with a groove in the middle; the slotted pin pair base and each slotted pin pair cover together form an oblong groove, and the two oblong grooves are arranged opposite to each other; the slotted pin pair bearings are installed at both ends of the fixed shaft of the venting cover plate; the slotted pin pair bearings are disposed in the oblong groove to achieve a sliding connection.

[0014] As a further improvement of the present invention, the grooved pin bearing is a deep groove ball bearing, the inner ring of which is interference-fitted with the fixed shaft of the vent cover, and the outer ring of which is clearance-fitted with the waist-shaped groove.

[0015] As a further improvement of the present invention, the lug connecting part is hinged to the axial flow stator casing by a pin, and the installation direction of the pin is parallel to the installation direction of the fixing shaft of the vent cover.

[0016] As a further improvement of the present invention, the adjustable venting mechanism further includes a slotted pin adjustment pad; the slotted pin adjustment pad is disposed between the bottom of the slotted pin structure and the venting linkage ring.

[0017] As a further improvement of the present invention, the number of electric push-pull rod fixing seats is two, and the two electric push-pull rod fixing seats are located on the same side of the venting linkage ring and are arranged opposite to each other.

[0018] As a further improvement of the present invention, the casing sealing structure includes a clamp, a sealing adjustment pad, and a shaped sealing ring; the inner ring angle of the shaped sealing ring is adapted to the conical surface of the vent cover plate, the sealing adjustment pad is disposed between the shaped sealing ring and the axial flow stator casing, and the clamp is used to fix the sealing adjustment pad and the shaped sealing ring in the stator casing vent hole of the axial flow stator casing.

[0019] As a further improvement of the present invention, the outer diameter of the irregular sealing ring is smaller than the inner diameter of the assembly surface of the vent hole of the stator casing; in the closed state, the conical surface of the vent cover plate automatically centers and presses against the irregular sealing ring through the contact of the conical surface.

[0020] As a further improvement of the present invention, the stator casing vent hole is provided with a clamp annular groove for installing a clamp and an annular flange for limiting the position of the irregular sealing ring; the clamp is assembled in the clamp annular groove to limit the axial displacement of the sealing adjustment pad and the irregular sealing ring; the outer side of the sealing adjustment pad is in close contact with the assembly surface of the stator casing vent hole, and the inner diameter of the sealing adjustment pad is smaller than the inner diameter of the irregular sealing ring.

[0021] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0022] This invention significantly reduces axial space occupation by vertically arranging the electric push-pull rod and the venting linkage ring, and using a circumferentially distributed slotted pin pair structure to transmit power, facilitating integrated arrangement within the narrow casing space of an aero-engine. The slotted pin pair structure is connected by slotted pin pair bearings, significantly reducing friction during mechanism movement; and using the electric push-pull rod as the power source reduces the number of moving pairs compared to traditional pneumatic or hydraulic mechanisms, simplifies the force transmission path, and results in a compact structure. It enables stepless precise control of the venting cover opening angle, thereby accurately adjusting the exhaust area and flow rate. Furthermore, the symmetrical arrangement of the two electric push-pull rods ensures uniformity of driving force and synchronization of action.

[0023] The vent cover of this invention adopts a conical surface, which, together with the sealing structure at the casing consisting of a clamp, a sealing adjustment pad, and a special-shaped sealing ring, can achieve automatic centering through the contact of the conical surface when closed, effectively compensating for assembly errors and ensuring sealing reliability under long-term high-temperature conditions.

[0024] This invention, by setting an adjusting pad for the slotted pin pair, can compensate for the dimensional chain deviations of each slotted pin pair structure in the circumferential direction during production and assembly, reducing the requirements for the machining accuracy of parts, while ensuring the synchronicity and consistency of the opening and closing of multiple sets of venting covers. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a compact, linked, and adjustable venting mechanism for an aero-engine according to the present invention.

[0026] Figure 2 This is a cross-sectional schematic diagram of a compact, linked, adjustable venting mechanism for an aero-engine according to the present invention.

[0027] Figure 3 This is a schematic diagram of the slotted pin pair structure of the present invention;

[0028] Figure 4This is a schematic diagram showing the fit between the casing seal structure and the stator casing vent hole of the present invention.

[0029] Reference numerals: 1. Electric push-pull rod fixing seat; 2. Electric push-pull rod; 3. Venting linkage ring; 4. Groove pin pair adjusting shim; 5. Groove pin pair structure; 51. Groove pin pair base; 52. Groove pin pair cover; 53. Groove pin pair bearing; 54. Waist-shaped groove; 6. Venting cover plate; 61. Conical surface; 62. Lug connection part; 7. Casing sealing structure; 71. Clamp; 72. Sealing adjusting shim; 73. Irregular sealing ring; 8. Axial flow stator casing; 81. Clamp annular groove; 82. Annular flange; 9. Gas collection chamber; 10. Centrifugal stator casing. Detailed Implementation

[0030] 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 some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Example:

[0032] Combined with appendix Figure 1-4 As shown, a compact, adjustable venting mechanism for an aero-engine comprises an electric push-pull rod mounting base 1, an electric push-pull rod 2, a venting linkage ring 3, a slotted pin adjustment pad 4, a slotted pin structure 5, a venting cover plate 6, and a casing sealing structure 7. At least two electric push-pull rod mounting bases 1 are mounted on the axial flow stator casing 8 using several fixing bolts. In this embodiment, two electric push-pull rod mounting bases 1 are provided, and both electric push-pull rod mounting bases 1 and two electric push-pull rods 2 are located on the same side of the venting linkage ring 3 and are arranged opposite each other. One end of the electric push-pull rod 2 is fixed to the electric push-pull rod mounting base 1 using fixing bolts, and the other end is inserted into one side of the venting linkage ring 3 and connected by fixing bolts. The electric push-pull rod 2 is parallel to the axis of the venting linkage ring 3. Several slotted pin structures 5 are evenly spaced on the other side of the venting linkage ring 3, through which a rotatable venting cover plate 6 is mounted.

[0033] The axial flow stator casing 8 has several stator casing vent holes on its side, corresponding one-to-one with the vent cover plate 6. The vent linkage ring 3, the slotted pin pair structure 5, and the vent cover plate are axially moved along the engine axis by driving the electric push-pull rod 2, so that the vent cover plate 6 closes onto the stator casing vent holes of the axial flow stator casing. To ensure that the electric push-pull rod 2 can provide sufficient and uniform axial pressure, multiple electric push-pull rods 2 can be used circumferentially as needed, effectively ensuring the reliable operation of the linkage mechanism. By synchronously extending and retracting at least two electric push-pull rods 2, the venting linkage ring 3 and multiple slotted pin structures 5 located on the venting linkage ring 3 are driven to move synchronously, so that multiple venting covers rotate relative to the axial flow stator casing 8 and slide within the slotted pin structure 5 under the connection action of the slotted pin structure 5 and the axial flow stator casing 8. This achieves the cooperation control between the conical surface 61 of the venting cover 6 and the casing sealing structure 7 of the stator casing venting hole, so as to open or close the stator casing venting hole or adjust the opening degree of the stator casing venting hole.

[0034] The adjustable venting mechanism has two states:

[0035] In the initial closed state, under the thrust of the electric push-pull rod 2, the venting linkage ring 3, the slotted pin pair structure 5 and the venting cover plate 6 are pushed out together, so that the venting cover plate 6 presses on the venting hole of the stator casing, thereby blocking the venting hole of the stator casing through the venting cover plate 6.

[0036] When the engine enters the bleed mode, both electric push-pull rods 2 respond simultaneously, pushing the bleed linkage ring 3 and the slotted pin pair structure 5 to move axially. The slotted pin pair structure 5 then drives the circumferentially distributed bleed cover plate 6 to rotate, opening the stator casing bleed port. Airflow is discharged from the circumferentially distributed stator casing bleed port, and the required exhaust area can be achieved by controlling the axial displacement. When the bleed linkage ring 3 and the slotted pin pair structure's slotted pin pair base and bleed cover plate move axially, the slotted pin pair bearing moves radially within the waist-shaped groove, causing the bleed cover plate 6 to rotate around its fixed axis, performing an opening and closing motion. By controlling the axial displacement of the electric push-pull rods 2, the opening and closing angle of the bleed cover plate 6 is controlled, thereby achieving precise control of the exhaust flow rate.

[0037] Preferably, the slotted pin pair structure 5 includes a slotted pin pair base 51, two slotted pin pair covers 52, and two slotted pin pair bearings 53. The slotted pin pair bearings 53 are deep groove ball bearings. The slotted pin pair base 51 is a U-shaped structure with a groove in the middle. The slotted pin pair adjusting shim 4 is provided between its bottom and the venting linkage ring 3 so that the axial position of each circumferentially distributed slotted pin pair structure 5 can be controlled by the thickness of the slotted pin pair adjusting shim 4, compensating for dimensional deviations during production and assembly, thereby improving the operating accuracy and synchronization consistency of the mechanism. Two slotted pin covers 52 are fixed to the top of the vent cover 6 by two bolts to avoid the slot opening, and the slotted pin structure 5 is installed as a whole on the side of the push-venting linkage ring 3 by the two bolts; the slotted pin base 51 and the two slotted pin covers 52 together form two opposing waist-shaped grooves 54; the connecting end of the vent cover 6 has a lug connecting part 62 and a fixed shaft, the closed end is provided with a conical surface 61, and slotted pin bearings 53 are installed at both ends of the fixed shaft; during installation, the fixed shaft of the vent cover 6 is inserted into the slotted pin. The slot of structure 5 is filled with the slotted pin bearing 53 located at both ends of the fixed shaft and positioned in the waist-shaped groove 54. The two slotted pin covers 52 are then mounted on the slotted pin base 51 by bolts. At this time, the inner ring of the slotted pin bearing 53 is interference-fitted with the fixed shaft of the vent cover plate 6 to be installed on the vent cover plate 6. The outer ring of the slotted pin bearing 53 is fitted with a small clearance between it and the waist-shaped groove so that the outer ring of the slotted pin bearing can roll in the waist-shaped groove to achieve a sliding connection. The inner ring of the slotted pin bearing is fixed to the fixed shaft.

[0038] The vent cover 6 has a conical surface 61 at its closing end for pressing and sealing against the stator casing vent hole sealing structure 7. Preferably, the casing sealing structure 7 includes a clamp 71, a sealing adjustment pad 72, and a shaped sealing ring 73 arranged sequentially. In the closed state, the vent cover 6 presses against the stator casing, and its lower conical surface presses against the sealing surface of the shaped sealing ring for sealing. The sealing effect under the pressing state can be reliably controlled by adjusting the size of the shaped sealing ring and the inclination angle of the contact surface. When the vent cover 6 is open, the shaped sealing ring is installed on the stator casing through the sealing adjustment pad and clamp to ensure it does not fall off. The outer diameter of the shaped sealing ring is slightly smaller than the inner diameter of the vent hole mounting surface, allowing it to automatically center itself through the conical contact surface when the vent cover 6 is closed, ensuring reliable sealing.

[0039] The stator casing vent hole is provided with a clamp annular groove 81 for mounting the clamp 71 and an annular flange 82 for limiting the position of the irregular sealing ring; the clamp is assembled in the clamp annular groove to limit the axial displacement of the sealing adjustment shim and the irregular sealing ring. (See attached diagram) Figure 4The inner ring angle of the irregular-shaped sealing ring 73 is adapted to the conical surface 61 of the vent cover 6. The outer diameter of the irregular-shaped sealing ring is smaller than the inner diameter of the vent hole assembly surface of the stator casing. In the closed state, the vent cover 6 presses against the axial flow stator casing, and the conical surface at its lower end and the irregular-shaped sealing ring can be automatically centered through the contact surface of the circular pin. At the same time, the conical surface of the vent cover 6 and the irregular-shaped sealing ring are pressed together to seal. The sealing effect under the pressing state can be reliably controlled by adjusting the size of the irregular-shaped sealing ring and the tilt angle of the contact surface. The outer side of the sealing adjustment pad is in close contact with the vent hole assembly surface of the stator casing, and the inner diameter of the sealing adjustment pad is smaller than the inner diameter of the irregular-shaped sealing ring to ensure that the sealing surface of the irregular-shaped sealing ring is pressed together with the conical surface 61 to seal, thus ensuring the overall sealing performance of the structure.

[0040] When the venting cover 6 is opened, the shaped sealing ring and the sealing adjustment pad are restricted from axial displacement by clamps to ensure that they do not fall off. When the venting mechanism is closed, the venting cover 6 presses against the axial flow stator casing, and the conical surface at the lower end presses against the sealing surface of the shaped sealing ring to seal it. The shaped sealing ring is fixed to the axial flow stator casing by the sealing adjustment pad and clamps.

[0041] To ensure proper fit between the vent cover 6 and the stator casing vent hole, the vent cover 6 has lug connecting portions 62 formed on its left and right sides. The axial flow stator casing 8 has holes that mate with the mounting holes on these lug connecting portions 62, allowing the vent cover 6 to be hinged onto the axial flow stator casing using pins. The pins are installed parallel to the fixed shaft's installation direction, enabling the vent cover to rotate along the pins and move relative to the slotted groove via a slotted pin bearing. The axial flow stator casing 8 and the centrifugal stator casing 10 together constitute the stator casing, and a gas collecting chamber 9 is formed between them.

[0042] The installation process of this compact, adjustable venting mechanism for aero-engines is as follows:

[0043] First, install the circumferentially distributed casing sealing structure 7. Then, install the irregularly shaped sealing ring, sealing adjustment shim, and clamp sequentially on the stator casing. Install the slotted pin bearing on the vent cover 6, and then install it on the axial flow stator casing using pins. The conical surface of the irregularly shaped sealing ring is slightly smaller and has a slightly larger inclination angle than the contact conical surface of the vent cover 6, ensuring that the irregularly shaped sealing ring deforms and presses against the assembly surface when the vent cover 6 is closed to guarantee sealing.

[0044] Fix the bleed linkage ring 3, several circumferentially distributed slotted pin adjustment shims 4, and slotted pin bases together to ensure that the axis of the bleed linkage ring is approximately coincident with the compressor axis. Using a tooling fixture, move it along the engine axis and align the slotted pin base with the slotted pin bearing, then press it firmly. Measure the gap between each pair of slotted pin bases and the outer ring of the bearing to select a slotted pin adjustment shim 4 of appropriate thickness. Install the slotted pin cover only after ensuring the correct position. The bleed linkage ring 3 is centered by the circumferentially distributed slotted pins, and its axis coincides with the compressor axis.

[0045] The electric push-pull rod 2 is a standard shelving product. Its structure mainly consists of a high-speed motor with a worm gear reducer. Considering load, stroke, and operating speed, a small-sized product was selected to control the size and weight of the electric push-pull rod 2. The rear end of the electric push-pull rod 2 is fixed to the electric push-pull rod mounting base 1. Then, it is installed as a whole on the axial flow stator casing and fixed to the venting linkage ring with bolts.

[0046] After assembly, the actuation mechanism is tested. When the venting linkage ring 3 has the maximum stroke, the opening angle of the venting cover 6 should not be less than the corresponding venting requirement value. If the requirement is not met, it can be adjusted by repairing the thickness of the mounting edge of the electric push-pull rod fixing seat 1.

[0047] Although the present invention has been described herein with reference to illustrative embodiments, the above embodiments are merely preferred embodiments of the present invention, and the implementation of the present invention is not limited to the above embodiments. It should be understood that those skilled in the art can devise many other modifications and implementations, which will fall within the scope and spirit of the principles disclosed in this application.

Claims

1. A compact, linked, adjustable venting mechanism for an aero-engine, characterized in that, include: An electric push-pull rod mounting base is fixedly installed on the axial flow stator casing; At least two electric push-pull rods, one end of which is fixed to the electric push-pull rod mounting base; The other end of the electric push-pull rod is connected to the rear side of the venting linkage ring, and the axis of the electric push-pull rod is parallel to the axis of the venting linkage ring. Multiple slotted pin structures are equally spaced on the front side of the venting linkage ring; Multiple venting covers are provided, each venting cover being rotatably mounted on a corresponding slotted pin pair structure. Each venting cover has a connecting end and a closing end. The connecting end has a fixed shaft and lugs on both sides of the connecting end. The fixed shaft is used for sliding connection with the slotted pin pair structure, and the lugs are used for hinged installation of the venting cover onto the axial flow stator casing and located outside the stator casing vent hole of the axial flow stator casing. The closing end has a conical surface for pressing and sealing against the casing sealing structure of the stator casing vent hole. By synchronously extending and retracting at least two electric push-pull rods, the venting linkage ring and multiple slotted pin pairs located on the venting linkage ring move synchronously. Under the connection between the slotted pin pairs and the axial flow stator casing, the multiple venting covers rotate relative to the axial flow stator casing and slide within the slotted pin pairs. This achieves the matching control of the conical surface of the venting cover with the casing sealing structure of the venting hole of the stator casing, so as to open or close the venting hole of the stator casing or adjust the opening degree of the venting hole of the stator casing.

2. The compact, linked, adjustable venting mechanism for an aero-engine according to claim 1, characterized in that, After the electric push-pull rod is inserted into the venting linkage ring, it is then fixed by fixing bolts.

3. The compact, linked, adjustable venting mechanism for an aero-engine according to claim 1, characterized in that, The slotted pin pair structure includes a slotted pin pair base, two slotted pin pair covers, and two slotted pin pair bearings. The slotted pin base is a U-shaped structure with a slot in the middle; The slotted pin base and each slotted pin cover together form an oblong groove, and the two oblong grooves are arranged opposite to each other. The vent cover plate has slotted pin bearings installed at both ends of the fixed shaft; the slotted pin bearings are disposed in the waist-shaped groove to achieve a sliding connection.

4. The compact, linked, adjustable venting mechanism for an aero-engine according to claim 3, characterized in that, The grooved pin bearing is a deep groove ball bearing, with its inner ring having an interference fit with the fixed shaft of the vent cover and its outer ring having a clearance fit with the waist-shaped groove.

5. The compact, linked, adjustable venting mechanism for an aero-engine according to claim 3, characterized in that, The lug connection is hinged to the axial flow stator casing by a pin, and the installation direction of the pin is parallel to the installation direction of the fixing shaft of the vent cover.

6. The compact, linked, adjustable venting mechanism for an aero-engine according to claim 1, characterized in that, The adjustable venting mechanism also includes a slotted pin adjustment pad; the slotted pin adjustment pad is disposed between the bottom of the slotted pin structure and the venting linkage ring.

7. The compact, linked, adjustable venting mechanism for an aero-engine according to claim 1, characterized in that, The number of electric push-pull rod fixing seats is two, and the two electric push-pull rod fixing seats are located on the same side of the venting linkage ring and are arranged opposite each other.

8. A compact, adjustable venting mechanism for an aero-engine according to any one of claims 1-7, characterized in that, The casing sealing structure includes a clamp, a sealing adjustment pad, and a shaped sealing ring; The inner ring angle of the irregular sealing ring is adapted to the conical surface of the vent cover plate. The sealing adjustment pad is disposed between the irregular sealing ring and the axial flow stator casing. The clamp is used to fix the sealing adjustment pad and the irregular sealing ring in the vent hole of the axial flow stator casing.

9. The compact, linked, adjustable venting mechanism for an aero-engine according to claim 8, characterized in that, The outer diameter of the irregular sealing ring is smaller than the inner diameter of the assembly surface of the vent hole of the stator casing; in the closed state, the conical surface of the vent cover plate automatically centers and presses against the irregular sealing ring through the contact of the conical surface.

10. The compact, linked, adjustable venting mechanism for an aero-engine according to claim 9, characterized in that, The stator casing vent hole is provided with a clamp annular groove for installing clamps and an annular flange for limiting the position of the irregular sealing ring; the clamp is assembled in the clamp annular groove to limit the axial displacement of the sealing adjustment pad and the irregular sealing ring; the outer side of the sealing adjustment pad is in close contact with the assembly surface of the stator casing vent hole, and the inner diameter of the sealing adjustment pad is smaller than the inner diameter of the irregular sealing ring.

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