A lift fan

Abstract

The application belongs to the technical field of lift fan design, and particularly relates to a lift fan, which is designed to synchronously drive a first-stage rotor blade disc and a second-stage rotor blade disc to synchronously and reversely rotate by using a driving shaft, can generate larger lift by the two-stage rotor, has simple overall configuration, compact structure, large lift-to-weight ratio, can offset the gyroscopic moment of the lift fan itself in the movement process by the mutual reverse rotation, has strong bearing capacity, and the first-stage stator blade ring and the second-stage stator blade ring are integral ring structures, so that the consistency of the stator blades is good and the circumferential unevenness can be reduced.

Description

Technical Field

[0001] This application belongs to the field of lift fan design technology, specifically relating to a lift fan. Background Technology

[0002] The lift fan is an important component of the short takeoff and landing (STOVL) propulsion system. It provides lift to the front of the aircraft and has an exit vectoring adjustment function.

[0003] The size of the aircraft and the output power of the main engine limit the flow rate and speed of the lift fan, resulting in insufficient structural design space and layout difficulties. Existing lift fans have low power, generate little lift, have a low lift-to-weight ratio, and weak load-bearing capacity.

[0004] This application is made in view of the aforementioned technical deficiencies.

[0005] It should be noted that the above background information is only used to assist in understanding the inventive concept and technical solution of this invention, and it does not necessarily belong to the prior art of this application. In the absence of clear evidence that the above information was disclosed on the filing date of this application, the above background information should not be used to evaluate the novelty and inventiveness of this application. Summary of the Invention

[0006] The purpose of this application is to provide a lift fan to overcome or mitigate at least one of the known technical defects.

[0007] The technical solution of this application is:

[0008] A lift fan, comprising:

[0009] Front-loaded outer casing;

[0010] The front-load-bearing inner casing is installed inside the front-load-bearing outer casing;

[0011] Multiple front-support plates are circumferentially supported between the front-support outer casing and the front-support inner casing;

[0012] Multiple imported adjustable stator blades are arranged circumferentially between the front bearing outer casing and the front bearing inner casing, and are located behind each front bearing support plate;

[0013] The cap, with its rear edge connected to the front end of the front load-bearing inner casing;

[0014] The primary rotor front support shaft is installed inside the front bearing inner casing, and its front end is connected to the front end of the front bearing inner casing.

[0015] The front end of the primary rotor outer casing is connected to the rear end of the front load-bearing outer casing;

[0016] The first-stage rotor blade disk is installed inside the outer casing of the first-stage rotor;

[0017] The first-stage rotor front journal is connected to the front side of the first-stage rotor impeller disk and is sealed with a grate between it and the front end of the front bearing inner casing. The first-stage rotor front support bearing is installed inside it and is sleeved on the first-stage rotor front support shaft.

[0018] The rear journal of the first-stage rotor is connected to the rear side of the first-stage rotor impeller disk;

[0019] The front end of the primary rotor rear drive adapter shaft is connected to the rear end of the primary rotor rear journal.

[0020] The first-stage stator blade ring is installed in the outer casing of the first-stage rotor, located behind the first-stage rotor blade disk. Its inner ring front end is sealed to the rear journal of the first-stage rotor by a grate.

[0021] The front end of the secondary rotor outer casing is connected to the rear end of the primary rotor outer casing;

[0022] The secondary rotor blade disk is installed inside the secondary rotor outer casing. Its front end is sealed with a grate tooth before the rear end of the primary stator blade ring, and with two grate teeth between it and the rear journal of the primary rotor.

[0023] The secondary rotor rear drive adapter shaft is sleeved on the outer circumference of the primary rotor rear journal, and its front end is connected to the front end of the secondary rotor impeller.

[0024] The rear load-bearing casing is connected at the rear end of the secondary rotor outer casing;

[0025] The second-stage stator blade ring is installed inside the rear bearing casing, and its inner ring front end is sealed to the rear end of the second-stage rotor blade disk by a grate tooth.

[0026] The rear load-bearing transition ring is installed inside the secondary stator vane ring and connected to the rear end of the inner ring of the secondary stator vane ring;

[0027] The secondary rotor support bearing housing is connected to the rear load-bearing transition ring, and the secondary rotor support bearing is installed inside it. The secondary rotor support bearing is sleeved on the rear drive transition shaft of the secondary rotor.

[0028] The sealing shaft is sleeved on the outer circumference of the rear journal of the first-stage rotor. Its rear end is in sealed contact with the rear end of the rear journal of the first-stage rotor, and its front end is sealed with the rear end of the rear drive shaft of the second-stage rotor through a grate.

[0029] The rear bearing support is connected to the rear end of the inner ring of the second stage stator blade ring. The rear bearing is installed inside it and is sleeved on the rear drive shaft of the first stage rotor.

[0030] The drive shaft passes through the rear bearing housing and is connected to the rear bearing housing via a housing support bearing. It also passes through the rear end of the inner ring of the second-stage stator blade ring and is connected to the front end of the first-stage rotor rear drive transfer shaft and the rear end of the second-stage rotor rear drive transfer shaft via bevel gears.

[0031] The drive shaft support bearing housing is set inside the inner ring of the secondary stator vane ring and is connected between the secondary rotor support bearing housing and the rear bearing support housing. The drive shaft support bearing is installed inside it and is sleeved on the drive shaft.

[0032] According to at least one embodiment of this application, in the above-mentioned lift fan, the first-stage rotor disk is designed with a hollow structure and the disk has a double-spoke plate configuration.

[0033] The secondary rotor impeller is hammer-shaped with the disc protruding forward.

[0034] According to at least one embodiment of this application, the above-described lift fan further includes:

[0035] The exhaust tail cone is connected to the rear end of the inner ring of the secondary stator blade ring;

[0036] The round-to-square housing connects with the rear load-bearing housing at the front end.

[0037] The box-type nozzle connects to the rear end of the round-to-square casing at the front end, and multiple adjustable stator blades are arranged inside it. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the lift fan provided in an embodiment of this application;

[0039] Figure 2 This is a schematic diagram of the exhaust tail cone configuration provided in an embodiment of this application;

[0040] in:

[0041] 1-Front-bearing outer casing; 2-Front-bearing inner casing; 3-Front-bearing support plate; 4-Inlet adjustable stator blade; 5-Cap cover; 6-First-stage rotor front support shaft; 7-First-stage rotor outer casing; 8-First-stage rotor blade disk; 9-First-stage rotor front journal; 10-First-stage rotor rear journal; 11-First-stage rotor rear drive transition shaft; 12-First-stage stator blade ring; 13-Second-stage rotor outer casing; 14-Second-stage rotor blade disk; 15-Second-stage rotor rear drive transition shaft; 16-Rear-bearing casing; 17-Second-stage stator blade ring; 18-Rear-bearing transition ring; 19-Second-stage rotor support bearing seat; 20-Sealing shaft; 21-Rear-bearing support; 22-Drive shaft; 23-Drive shaft support bearing seat; 24-Connecting shaft; 25-Exhaust tail cone; 26-; 27-Round to square casing; 28-Box nozzle; 29-Outlet adjustable stator blade.

[0042] To better illustrate this embodiment, some parts in the accompanying drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. Furthermore, the drawings are for illustrative purposes only and should not be construed as limiting this application. Detailed Implementation

[0043] To make the technical solution and advantages of this application clearer, the technical solution of this application will be described in a clearer and more complete manner below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some embodiments of this application, and are only used to explain this application, not to limit this application. It should be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings. Other related parts can be referred to the general design. In the absence of conflict, the embodiments and technical features in the embodiments of this application can be combined with each other to obtain new embodiments.

[0044] Furthermore, unless otherwise defined, the technical or scientific terms used in this application description shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "upper," "lower," "left," "right," "center," "vertical," "horizontal," "inner," and "outer," etc., used in this application description to indicate relative direction or positional relationship are used only to indicate relative orientation or positional relationship, and do not imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. When the absolute position of the described object changes, its relative positional relationship may also change accordingly, and therefore should not be construed as a limitation on this application. The terms "first," "second," "third," and similar terms used in this application description are used only for descriptive purposes to distinguish different components, and should not be construed as indicating or implying relative importance. The terms "a," "one," or "the," etc., used in this application description should not be construed as an absolute limitation on quantity, but should be construed as indicating the existence of at least one. The terms "including," "comprising," etc., used in this application description mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, without excluding other elements or objects.

[0045] Furthermore, it should be noted that, unless otherwise explicitly specified and limited, terms such as “installation,” “connection,” and “linkage” used in the description of this application should be interpreted broadly. For example, a 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; or it can be a connection within two components. Those skilled in the art can understand its specific meaning in this application according to the specific circumstances.

[0046] The following is in conjunction with the appendix Figures 1 to 2This application will be described in further detail.

[0047] A type of lift fan, such as Figure 1 As shown, it includes:

[0048] Front-loaded outer casing 1;

[0049] The front-load-bearing inner casing 2 is installed inside the front-load-bearing outer casing 1;

[0050] Multiple front-bearing support plates 3 are circumferentially supported between the front-bearing outer casing 1 and the front-bearing inner casing 2;

[0051] Multiple imported adjustable stator blades 4 are arranged circumferentially between the front bearing outer casing 1 and the front bearing inner casing 2, and are located behind each front bearing support plate 3. The angle can be adjusted by the stator blade adjustment mechanism, which can realize ultra-large angle control of the inlet airflow. The adjustment range can reach up to 75°. The stator blade adjustment mechanism can be designed with reference to the existing scheme, and will not be described in more detail here.

[0052] The rear edge of the cap 5 is connected to the front end of the front load-bearing inner casing 2;

[0053] The first-stage rotor front support shaft 6 is installed inside the front bearing inner casing 2, and its front end is connected to the front end of the front bearing inner casing 2.

[0054] The front end of the primary rotor outer casing 7 is connected to the rear end of the front load-bearing outer casing 1;

[0055] The first-stage rotor blade disk 8 is installed inside the first-stage rotor outer casing 7;

[0056] The first-stage rotor front journal 9 is connected to the front side of the first-stage rotor blade disk 8 and is sealed with a grate between it and the front end of the front bearing inner casing 2. The first-stage rotor front support bearing is installed inside it and is sleeved on the first-stage rotor front support shaft 6.

[0057] The rear journal 10 of the first-stage rotor is connected to the rear side of the impeller disk 8 of the first-stage rotor;

[0058] The front end of the primary rotor rear drive adapter shaft 11 is connected to the rear end of the primary rotor rear journal 10.

[0059] The first-stage stator blade ring 12 is installed in the outer casing 7 of the first-stage rotor and is located behind the first-stage rotor blade disk 8. Its inner ring front end is sealed with the first-stage rotor rear journal 10 by a grate tooth.

[0060] The front end of the secondary rotor outer casing 13 is connected to the rear end of the primary rotor outer casing 7;

[0061] The secondary rotor blade disk 14 is installed inside the secondary rotor outer casing 13. Its front end is sealed with a grate tooth before the rear end of the primary stator blade ring 12, and is sealed with two grate teeth between it and the rear journal 10 of the primary rotor.

[0062] The secondary rotor rear drive adapter shaft 15 is sleeved on the outer periphery of the primary rotor rear journal 10, and its front end is connected to the front end of the secondary rotor blade disk 14.

[0063] The rear load-bearing casing 16 is connected at the rear end of the secondary rotor outer casing 13;

[0064] The second-stage stator blade ring 17 is installed inside the rear bearing casing 16, and its inner ring front end is sealed with the rear end of the second-stage rotor blade disk 14 by a grate tooth.

[0065] The rear load-bearing transition ring 18 is installed inside the secondary stator blade ring 17 and connected to the rear end of the inner ring of the secondary stator blade ring 17.

[0066] The secondary rotor support bearing housing 19 is connected to the rear load-bearing transition ring 18, and the secondary rotor support bearing is installed inside it. The secondary rotor support bearing is sleeved on the secondary rotor rear drive transition shaft 15.

[0067] The sealing shaft 20 is sleeved on the outer periphery of the rear journal 10 of the first stage rotor. Its rear end is in sealed contact with the rear end of the rear journal 10 of the first stage rotor, and its front end is sealed with the rear end of the rear drive shaft 15 of the second stage rotor through a grate.

[0068] The rear bearing support 21 is connected to the rear end of the inner ring of the secondary stator blade ring 17. The rear bearing is installed inside it, and the rear bearing is sleeved on the rear drive transfer shaft 11 of the primary rotor.

[0069] The drive shaft 22 passes through the rear bearing casing 16 and is connected to the rear bearing casing 16 by the casing support bearing. It also passes through the rear end of the inner ring of the secondary stator blade ring 17 and is connected to the front end of the primary rotor rear drive transfer shaft 11 and the rear end of the secondary rotor rear drive transfer shaft 15 by bevel gears. It can be driven by an electric motor or a gas turbine, thereby driving the primary rotor blade disk 8 and the secondary rotor blade disk 14 to rotate in opposite directions.

[0070] The drive shaft support bearing housing 23 is set inside the inner ring of the secondary stator vane ring 17 and is connected between the secondary rotor support bearing housing 19 and the rear bearing support 21. The drive shaft support bearing is installed inside it and is sleeved on the drive shaft 22.

[0071] For the lift fan disclosed in the above embodiments, those skilled in the art will understand that its design uses a single drive shaft 22 to synchronously drive the first-stage rotor blade disk 8 and the second-stage rotor blade disk 14 to rotate synchronously in opposite directions. It can generate a large lift with two-stage rotors. The overall configuration is simple and compact, with a large lift-to-weight ratio. It can also cancel its own gyroscopic torque during the motion by rotating in opposite directions, and has a strong load-bearing capacity. In addition, the first-stage stator blade ring 12 and the second-stage stator blade ring 17 are integral ring structures with good stator blade consistency, which can reduce circumferential non-uniformity.

[0072] In some alternative embodiments, the first-stage rotor disk 8 of the above-described lift fan is designed with a hollow structure and a double-spoke plate configuration inside the disk.

[0073] The secondary rotor blade disk 14 adopts a hammer shape, and the disk body protrudes backward.

[0074] For the lift fan disclosed in the above embodiments, those skilled in the art will understand that the overall mass difference between the first-stage rotor disk 8 and the second-stage rotor disk 14 is huge. Synchronously driving them with a single drive shaft 22 requires vastly different power. Designing the first-stage rotor disk 8 as a hollow structure with a double-spoke configuration within the disk ensures its load-bearing capacity, controls radial deformation at the front and rear ends of the disk, and reduces the overall mass of the first-stage rotor disk 8 through design. Simultaneously, designing the second-stage rotor disk 14 as a hammer-shaped disk with a forward-protruding disc body shifts the center of gravity of the disk forward, reducing bending deformation of the second-stage rotor disk 14 and increasing the self-weight of the cantilever rotor. This balances the difference in rotational inertia between the first-stage rotor disk 8 and the second-stage rotor disk 14, balancing the difference in power requirements for the drive shaft 22 and avoiding unexpected wear and misalignment caused by uneven force.

[0075] In some optional embodiments, the lift fan described above further includes:

[0076] The exhaust tail cone 25 is connected to the rear end of the inner ring of the rear bearing casing 16. It adopts an asymmetrical design, which can realize the pre-adjustment of the outlet airflow.

[0077] The round-to-square casing 27, with its front end docking with the rear load-bearing casing 16, adopts an irregular design;

[0078] The box-type nozzle 28 is rectangular, with its front end connected to the rear end of the round-to-square casing 27. Multiple adjustable stator blades 29 are arranged inside, and their angles can be adjusted by the stator blade adjustment mechanism. This allows for the adjustment of the flow vector of the outlet gas and control of the lift direction. The adjustment range can reach 70°. The stator blade adjustment mechanism can be designed based on existing schemes, and will not be described in more detail here.

[0079] In some optional embodiments, in the above-mentioned lift fan, graphite seals are provided at the corresponding parts of the first-stage rotor front support bearing, the second-stage rotor support bearing, and the rear bearing, and corresponding lubricating oil chambers are constructed, with each lubricating oil chamber connected to the others.

[0080] An oil supply pipe is installed through a front bearing support plate 3 to supply oil to each lubrication chamber and to lubricate and cool the front support bearing of the first-stage rotor, the support bearing of the second-stage rotor, and the rear bearing.

[0081] The aforementioned lift fans also include:

[0082] The bottom oil sump 26 is connected to the rear end of the inner ring of the rear bearing casing 16 and is located inside the exhaust tail cone 25 at the bottom. It can collect lubricating oil by gravity and can be connected to an external pipeline to extract the collected lubricating oil for recycling.

[0083] In some optional embodiments, the above-mentioned lift fan also includes an air system design, including ventilation holes at the rear end of the inner ring of the second-stage stator blade ring 17, the front end of the second-stage rotor blade disk 14, the rear drive shaft 15 of the second-stage rotor, the rear end of the rear journal 10 of the first-stage rotor, and the front journal 9 of the first-stage rotor.

[0084] The aforementioned lift fans also include:

[0085] The connecting shaft 24 is connected between the front journal 9 and the rear journal 10 of the first-stage rotor, and has a vent hole at its front end.

[0086] The high-pressure gas behind the secondary stator ring 17 can flow through various vents to achieve sealing and pressure balance. The axial ventilation device can centrifugally pressurize the gas, promote its forward discharge, and can also be equipped with an axial ventilation device for effective oil-gas separation.

[0087] The various embodiments in the specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0088] The technical solution of this application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. Those skilled in the art should understand that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.

Claims

1. A lift fan, characterized in that, include: Front-load-bearing outer casing (1); The front load-bearing inner casing (2) is installed inside the front load-bearing outer casing (1); Multiple front-bearing support plates (3) are circumferentially supported between the front-bearing outer casing (1) and the front-bearing inner casing (2); Multiple imported adjustable stator blades (4) are arranged circumferentially between the front bearing outer casing (1) and the front bearing inner casing (2), and are located behind each front bearing support plate (3); The cap (5) is connected at the rear edge to the front end of the front load-bearing inner casing (2); The first-stage rotor front support shaft (6) is installed inside the front bearing inner casing (2), and its front end is connected to the front end of the front bearing inner casing (2); The front end of the primary rotor outer casing (7) is connected to the rear end of the front load-bearing outer casing (1); The first-stage rotor blade disk (8) is installed inside the first-stage rotor outer casing (7); The first-stage rotor front journal (9) is connected to the front side of the first-stage rotor impeller (8) and is sealed with a grate between it and the front end of the front bearing inner casing (2). The first-stage rotor front support bearing is installed inside it and is sleeved on the first-stage rotor front support shaft (6). The rear journal (10) of the first-stage rotor is connected to the rear side of the impeller disk (8) of the first-stage rotor; The front end of the primary rotor rear drive adapter shaft (11) is connected to the rear end of the primary rotor rear journal (10); The first-stage stator blade ring (12) is installed inside the first-stage rotor outer casing (7) and located behind the first-stage rotor blade disk (8). Its inner ring front end is sealed with the first-stage rotor rear journal (10) by a grate tooth. The front end of the secondary rotor outer casing (13) is connected to the rear end of the primary rotor outer casing (7); The secondary rotor blade disk (14) is installed inside the secondary rotor outer casing (13). Its front end is sealed with a grate tooth before the rear end of the primary stator blade ring (12), and with two grate teeth between it and the rear journal (10) of the primary rotor. The secondary rotor rear drive adapter shaft (15) is sleeved on the outer periphery of the primary rotor rear journal (10), and its front end is connected to the front end of the secondary rotor impeller (14); The rear bearing casing (16) is connected at the front end to the rear end of the secondary rotor outer casing (13); The secondary stator blade ring (17) is installed inside the rear bearing casing (16), and its inner ring front end is sealed with the rear end of the secondary rotor blade disk (14) by a grate tooth; The rear load-bearing transition ring (18) is set inside the secondary stator blade ring (17) and connected to the rear end of the inner ring of the secondary stator blade ring (17); The secondary rotor support bearing housing (19) is connected to the rear bearing transition ring (18), and the secondary rotor support bearing is installed inside it. The secondary rotor support bearing is sleeved on the secondary rotor rear drive transition shaft (15). The sealing shaft (20) is sleeved on the outer circumference of the rear journal (10) of the first stage rotor. The rear end is in sealed contact with the rear end of the rear journal (10) of the first stage rotor, and the front end is sealed with the rear end of the rear drive transfer shaft (15) of the second stage rotor through a grate. The rear bearing support (21) is connected to the rear end of the inner ring of the secondary stator blade ring (17), and the rear bearing is installed inside it. The rear bearing is sleeved on the rear drive transfer shaft (11) of the primary rotor. The drive shaft (22) is set through the rear bearing housing (16) and is connected to the rear bearing housing (16) by the housing support bearing. It is also set through the rear end of the inner ring of the secondary stator blade ring (17) and is connected to the front end of the primary rotor rear drive transfer shaft (11) and the rear end of the secondary rotor rear drive transfer shaft (15) by bevel gears. The drive shaft support bearing housing (23) is set inside the inner ring of the secondary stator blade ring (17) and connected between the secondary rotor support bearing housing (19) and the rear bearing support (21). The drive shaft support bearing is installed inside it and is sleeved on the drive shaft (22).

2. The lift fan according to claim 1, characterized in that, The first-stage rotor disk (8) is designed with a hollow structure and a double-spoke plate configuration inside the disk; The secondary rotor impeller (14) is hammer-shaped with the disc body protruding forward.

3. The lift fan according to claim 1, characterized in that, Also includes: The exhaust tail cone (25) is connected to the rear end of the inner ring of the secondary stator blade ring (17); The round-to-square housing (27) is connected at the front end to the rear load-bearing housing (16); The front end of the box-type nozzle (28) is connected to the rear end of the round-to-square casing (27), and multiple outlet adjustable stator blades (29) are arranged inside it.

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