A compressor casing air bleeding assembly and an aero-engine

Abstract

The application discloses a compressor casing air guide assembly and an aero-engine, realizes the adjustment of the air guide amount at the air guide hole of the casing, and can guarantee the casing strength. The technical scheme is as follows: the assembly comprises the casing, an air guide hole mounting seat, an air guide fan mounting seat, an air guide hole, a web plate, and a mounting hole of a supporting bearing connected with the air guide fan mounting seat; the supporting bearing mounting hole, a supporting bearing, an air guide fan shaft, fan blades, a locking nut, and an air guide rotor shaft; wherein the supporting bearing is mounted in the mounting hole of the air guide fan mounting seat, one side end surface is matched with a stepped surface of the air guide rotor shaft, and the other side end surface is matched with an end surface of a transmission shaft; a plurality of fan blades are processed on the outer cylindrical surface of the air guide fan shaft, and the fan blades are integrally formed with the air guide fan shaft or are welded to the air guide fan shaft.

Description

Technical Field

[0001] This invention relates to a compressor assembly, and more specifically to a compressor casing bleed air assembly. Background Technology

[0002] In the design and operation of aero engines, the compressor plays a crucial role. The gas in the compressor flow passage has a relatively low temperature and high pressure, characteristics that make the compressor an ideal source of bleed air for other engine components. Bleed air is widely used for critical functions such as cooling high-temperature components and sealing pivot points. In existing technologies, compressor bleed air is typically drawn from multiple locations within the compressor. One method involves drawing air from the compressor flow passage into the inner cavity of the outer casing, and then extracting it through bleed ports on the outer casing.

[0003] However, existing designs have some limitations. Specifically, the area of ​​the bleed air vents on the casing is fixed, meaning the upper limit of the bleed air volume is also fixed. When the bleed air volume needs to be adjusted, it can usually only be achieved through valves, and cannot exceed this fixed upper limit. If a larger bleed air volume is required, the size of the bleed air vents must be modified during the design phase, i.e., the bleed air vent area must be increased. However, increasing the bleed air vent area will reduce the strength of the casing, which not only affects the structural integrity of the casing but may also adversely affect the reliability and performance of the entire compressor.

[0004] Therefore, the main problems existing in the prior art include:

[0005] The upper limit of the air intake volume is limited by the fixed area of ​​the air intake port and cannot be adjusted beyond this upper limit through existing mechanisms;

[0006] Increasing the bleed air volume by increasing the bleed air port area will sacrifice the strength of the casing, thus affecting the reliability of the compressor.

[0007] These issues limit further improvements in aero-engine performance, especially when greater bleed air volume is required to meet the cooling needs of high-temperature components and pivot point sealing. Therefore, it is necessary to develop a new compressor casing bleed air assembly to address these technical problems, improve bleed air flexibility, and maintain or enhance the structural strength of the casing. Summary of the Invention

[0008] The following provides a brief overview of one or more aspects to offer a basic understanding of them. This overview is not an exhaustive summary of all conceived aspects, nor is it intended to identify key or decisive elements of all aspects, nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form to prepare for the more detailed descriptions that follow.

[0009] The purpose of this invention is to solve the above-mentioned problems and provide a compressor casing bleed air assembly and an aero-engine, which can adjust the bleed air volume at the casing bleed air port and ensure the casing strength.

[0010] The technical solution of this invention is as follows: This invention discloses a compressor casing bleed air assembly, comprising:

[0011] The casing, which serves as the outer casing of the compressor's rear stator, has an air duct mounting seat on its surface.

[0012] The bleed air port mounting bracket, located on the surface of the casing, is the mounting position for the bleed air fan mounting bracket;

[0013] The bottom outer contour of the expiratory fan mounting bracket is consistent with the expiratory port mounting bracket and is fixedly installed on the casing.

[0014] The air vent, located at the bottom of the air vent fan mounting base, is used to guide airflow;

[0015] The spokes connect the upper part of the expiratory fan mounting base to the central support bearing mounting holes, providing structural support;

[0016] The support bearing mounting hole is located in the center of the exhaust fan mounting base and is used to install the support bearing.

[0017] The support bearing is installed in the mounting hole of the exhaust fan mounting base. One end face mates with the stepped surface of the exhaust rotor shaft, and the other end face mates with the end face of the drive shaft.

[0018] The exhaust fan shaft has several fan blades machined on its outer cylindrical surface. The fan blades are integrally formed with the exhaust fan shaft or welded to the exhaust fan shaft.

[0019] Fan blades, mounted on the exhaust fan shaft, are used to pressurize the airflow;

[0020] Locking nuts are used to secure the induced draft fan shaft to the lower end of the induced draft rotor shaft;

[0021] The exhaust rotor shaft has a step in the middle, which mates with the support bearing. One end is used to install the exhaust fan shaft, and the other end is used to connect the drive shaft.

[0022] The drive shaft has a central threaded hole that mates with the surface thread of the induced draft rotor shaft. One end face is pressed against the end face of the support bearing, and the other end of the drive shaft is machined into a gear structure, which is connected to the motor through a gear transmission mechanism.

[0023] According to one embodiment of the compressor casing bleed air assembly of the present invention, the assembly further includes:

[0024] The bleed air mounting gasket is placed between the bleed air fan mounting base and the bleed air port mounting base to improve sealing performance.

[0025] According to one embodiment of the compressor casing bleed assembly of the present invention, the surface of the bleed hole is coated with a wear-resistant coating to resist the abrasion of the airflow and improve durability.

[0026] According to one embodiment of the compressor casing bleed air assembly of the present invention, a blade tip gap is formed between the fan blade and the inner bleed air hole wall of the bleed air fan mounting base.

[0027] According to one embodiment of the compressor casing bleed air assembly of the present invention, the motor gear transmission drives the transmission shaft to rotate, which in turn drives the bleed air rotor shaft and the bleed air fan shaft to rotate, causing the fan blades to rotate. The airflow flows into the inner cavity of the casing from the compressor main flow channel and then flows out from the bleed air hole. Under the pressurization effect of the fan blades, the airflow rate per unit time through the bleed air hole is increased, thereby increasing the bleed air volume. The rotation speed of the fan blades is adjusted by adjusting the motor speed, thereby regulating the bleed air volume.

[0028] The present invention also discloses an aircraft engine including the compressor casing bleed air assembly as described above.

[0029] Compared with the prior art, the present invention has the following advantages: By installing a centrifugal pressurization structure on the bleed air mounting base of the compressor outer casing, the present invention increases the airflow pressure at the bleed air port, thereby increasing the bleed air volume on the outer casing. Simultaneously, it increases the bleed air volume without increasing the bleed air port area, thus ensuring casing strength. Compared with the prior art, the present invention can adjust the bleed air volume at the casing bleed air port by adjusting the motor speed; moreover, it increases the bleed air volume without increasing the bleed air port area, thus ensuring casing strength. Attached Figure Description

[0030] The above-described features and advantages of the present invention will be better understood after reading the following detailed description of embodiments of the present disclosure in conjunction with the accompanying drawings. In the drawings, components are not necessarily drawn to scale, and components having similar related characteristics or features may have the same or similar reference numerals.

[0031] Figure 1 A schematic diagram of the extension casing and bleed port mounting base;

[0032] Figure 2 This is a schematic diagram of the compressor casing bleed air assembly of the present invention;

[0033] Figure 3 This is a schematic diagram of the structure of the air venting fan mounting base of the present invention.

[0034] [Attached image labels]

[0035] 1—Air intake fan mounting bracket;

[0036] 11—Air intake hole of the exhaust fan mounting base;

[0037] 12—Abrasion-resistant coating;

[0038] 13 – Spokes;

[0039] 14 — Support bearing mounting hole;

[0040] 2—Air intake mounting pad;

[0041] 3—Outer casing of the compressor;

[0042] 31—Air vent mounting base;

[0043] 4—Exhaust fan shaft;

[0044] 5—Exhaust air rotor shaft;

[0045] 6 — Tighten the lock nut;

[0046] 7—Fan blades;

[0047] 8—Drive shaft;

[0048] 9—Support bearing. Detailed Implementation

[0049] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should be noted that the aspects described below with reference to the accompanying drawings and specific embodiments are merely exemplary and should not be construed as limiting the scope of protection of the present invention in any way.

[0050] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0051] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0052] Figure 2The structure of an embodiment of the compressor casing bleed air assembly of the present invention is shown. Please refer to... Figure 2 The components in this embodiment include the following:

[0053] Casing 3: Serves as the outer casing of the compressor's rear stator, such as... Figure 1 As shown, its surface is provided with an air duct mounting base 31, which is used to guide airflow to other components for cooling or anti-icing purposes.

[0054] Air vent mounting base 31: Located on the surface of the casing 3, it is the mounting position for the air vent fan mounting base 1.

[0055] Exhaust fan mounting bracket 1: Structure as follows Figure 2 , Figure 3 As shown, its bottom outer contour matches the air vent mounting base 31, and it is fixed to the casing 3 by bolts. Preferably, to improve sealing, an air vent mounting gasket 2 can be added between the two. Air vent mounting gasket 2: placed between the air vent fan mounting base 1 and the air vent mounting base 31 to improve sealing performance.

[0056] Air vent 11: Located at the bottom of the air vent fan mounting base 1, it is used to guide airflow. The surface of the air vent 11 is coated with a wear-resistant coating 12 to improve durability.

[0057] Wear-resistant coating 12: Coated on the surface of the air intake hole 11 to resist the wear of airflow.

[0058] Spoke 13: The mounting hole 14 of the support bearing 9 at the top and center of the exhaust fan mounting base 1 provides structural support.

[0059] Support bearing mounting hole 14: Located in the center of the exhaust fan mounting base 1, used to install the support bearing 9.

[0060] Support bearing 9: Installed in the mounting hole 14 of the exhaust fan mounting base 1, one end face of which mates with the stepped surface of the exhaust rotor shaft 5, and the other end face of which mates with the end face of the drive shaft 8.

[0061] Exhaust fan shaft 4: Several fan blades 7 are machined on the outer cylindrical surface. The fan blades 7 are integrally formed with the exhaust fan shaft 4 or welded to the exhaust fan shaft 4. A blade tip gap is formed between the fan blades 7 and the wall of the exhaust hole 11 inside the exhaust fan mounting base 1.

[0062] Fan blade 7: Mounted on the exhaust fan shaft 4, used to pressurize the airflow.

[0063] Locking nut 6: Used to fix the induced draft fan shaft 4 to the lower end of the induced draft rotor shaft 5.

[0064] The exhaust rotor shaft 5 is cylindrical with a step in the middle. It is used to mate with the support bearing 9. One end is used to install the exhaust fan shaft 4, and the other end is used to connect the drive shaft 8.

[0065] Drive shaft 8: Cylindrical in shape, with a central threaded hole that mates with the threaded surface of the induced draft rotor shaft 5. One end face is pressed against the end face of the support bearing 9. The other end of drive shaft 8 is machined into a gear structure, which is connected to the motor via a gear transmission mechanism.

[0066] The working principle of the compressor casing bleed air assembly is as follows: The motor gear transmission drives the drive shaft 8 to rotate, which in turn drives the bleed air rotor shaft 5 and the bleed air fan shaft 4 to rotate, causing the fan blades 7 to rotate. Airflow enters the inner cavity of the casing 3 from the compressor's main flow channel and then flows out through the bleed air port 11. Under the pressurization effect of the fan blades 7, the airflow rate per unit time through the bleed air port 11 increases, thus increasing the bleed air volume. By adjusting the motor speed, the rotation speed of the fan blades 7 can be adjusted, thereby regulating the bleed air volume.

[0067] For example, a belt or other transmission method can be used between the motor and the drive shaft 8; or the motor can be installed on the exhaust fan mounting base 1 to directly drive the exhaust fan shaft 4 to rotate, simplifying the transmission structure.

[0068] The present invention also discloses an embodiment of an aircraft engine including the compressor casing bleed air assembly as described above.

[0069] The prior description of this disclosure is provided to enable any person skilled in the art to make or use this disclosure. Various modifications to this disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not intended to be limited to the examples and designs described herein, but should be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A compressor casing bleed air assembly, characterized in that, include: The casing, which serves as the outer casing of the compressor's rear stator, has an air duct mounting seat on its surface. The bleed air port mounting bracket, located on the surface of the casing, is the mounting position for the bleed air fan mounting bracket; The bottom outer contour of the exhaust fan mounting bracket is consistent with the exhaust port mounting bracket and is fixedly installed on the casing. The air vent, located at the bottom of the air vent fan mounting base, is used to guide airflow; The spokes connect the upper part of the expiratory fan mounting base to the central support bearing mounting holes, providing structural support; The support bearing mounting hole is located in the center of the exhaust fan mounting base and is used to install the support bearing; The support bearing is installed in the mounting hole of the exhaust fan mounting base. One end face mates with the stepped surface of the exhaust rotor shaft, and the other end face mates with the end face of the drive shaft. The exhaust fan shaft has several fan blades machined on its outer cylindrical surface. The fan blades are integrally formed with the exhaust fan shaft or welded to the exhaust fan shaft. Fan blades, mounted on the exhaust fan shaft, are used to pressurize the airflow; Locking nuts are used to secure the induced draft fan shaft to the lower end of the induced draft rotor shaft; The exhaust rotor shaft has a step in the middle, which mates with the support bearing. One end is used to install the exhaust fan shaft, and the other end is used to connect the drive shaft. The drive shaft has a central threaded hole that mates with the surface thread of the induced draft rotor shaft. One end face is pressed against the end face of the support bearing, and the other end of the drive shaft is machined into a gear structure, which is connected to the motor through a gear transmission mechanism.

2. The compressor casing bleed air assembly according to claim 1, characterized in that, The components also include: The bleed air mounting gasket is placed between the bleed air fan mounting base and the bleed air port mounting base to improve sealing performance.

3. The compressor casing bleed air assembly according to claim 1, characterized in that, The surface of the air intake is coated with a wear-resistant coating to resist the abrasion of the airflow and improve durability.

4. The compressor casing bleed air assembly according to claim 1, characterized in that, A blade tip gap is formed between the fan blades and the wall of the air vent inside the air vent mounting base.

5. The compressor casing bleed air assembly according to claim 1, characterized in that, The motor gear drive rotates the drive shaft, which in turn drives the bleed air rotor shaft and bleed air fan shaft, causing the fan blades to rotate. The airflow flows into the inner cavity of the casing from the compressor mains duct and then flows out from the bleed air holes. Under the pressurization effect of the fan blades, the airflow rate per unit time through the bleed air holes increases, thus increasing the bleed air volume. The bleed air volume is regulated by adjusting the motor speed to adjust the rotation speed of the fan blades.

6. An aircraft engine, characterized in that, Includes the compressor casing bleed air assembly as described in any one of claims 1 to 5.

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