A variable consistency fan for a turbomachine

Abstract

The present invention provides a variable-solidity fan for a turbofan engine, which includes an engine body, a fan, and an additional blade assembly. The fan is mounted on the engine body through a main shaft, and the additional blade assembly is mounted on the main shaft and located inside the fan. Connecting grooves are provided on the blades of the fan, and connecting blocks corresponding to the connecting grooves are provided on the additional blades. The additional blades are clamped with the connecting grooves of the blades through a driving device. The additional blades and the fan blades are arranged in an interleaved manner to increase the solidity of the fan. For the variable-solidity fan for a turbofan engine according to the present invention, when it is necessary to increase the solidity of the blades, the mounting ring is slid in the direction of the blades, pushing the slider to slide, so that the additional blades approach the blades. As the blades rotate, when the connecting blocks rotate to the positions of the connecting grooves, the connecting blocks are snapped into the connecting grooves, so that a part of the additional blades is attached to the back of the blades and arranged in an interleaved manner, playing a role in increasing the number of blades.

Description

Technical Field

[0001] The present invention belongs to the technical field of turbine engines, and particularly relates to a variable-solidity fan for a turbine engine. Background Art

[0002] The performance level of the compressor component in a turbine engine has been improved due to more perfect compressor design technology and higher compressor efficiency. The change in the solidity of the first-stage fan of the compressor is related to the total pressure loss of the compressor, the secondary flow loss, and the change in the relative total pressure loss coefficient of the cascade. The engine has a corresponding optimal solidity value at different rotational speeds. Currently, the number of fan blades in a turbine engine is fixed, and the solidity cannot be adjusted.

[0003] Therefore, the present application proposes a variable-solidity fan for a turbine engine to solve the above problems. Summary of the Invention

[0004] In view of this, the present invention aims to propose a variable-solidity fan for a turbine engine, where the number of fan blades in the existing turbine engine is fixed and the solidity cannot be adjusted.

[0005] To achieve the above object, the technical solution of the present invention is realized as follows:

[0006] A variable-solidity fan for a turbine engine includes an engine body, a fan installed on the engine body, and an additional blade assembly for increasing the solidity of the fan;

[0007] The fan is installed on the engine body through a main shaft, and the additional blade assembly is installed on the main shaft and is located inside the fan;

[0008] The additional blade assembly includes a driving device and additional blades. Connection grooves are provided on the blades of the fan, and connection blocks corresponding to the connection grooves are provided on the additional blades. The additional blades are clamped with the connection grooves of the blades through the driving device. The additional blades and the fan blades are arranged in an interleaved manner to increase the solidity of the fan.

[0009] Further, a blade fixing frame is installed on the inner wall of the blade. The connection grooves include a plurality of them and are equidistantly arranged on the blade fixing frame. The connection blocks are arranged on the end faces of the additional blades adjacent to the blades, and the connection blocks are inserted into the connection grooves.

[0010] Further, the additional blades are rotatably installed on the main shaft through sliders. The sliders are sleeved on the main shaft, and rotation grooves are provided on the side walls of the sliders. Rotation rings are provided on the additional blades, and the rotation rings are located in the rotation grooves.

[0011] Such as Figure 1 And Figure 2As shown, it can be seen that the additional blade is rotatably installed in the rotating groove through a rotating ring, and the slider can be slidably installed on the main shaft. When the blade rotates, the connecting block is snapped into the connecting groove. At this time, the additional blade needs to rotate along with the blade. Therefore, the rotating ring of the additional blade rotates in the rotating groove.

[0012] Furthermore, the slider is slidably installed on the main shaft through a mounting ring. The mounting ring is sleeved on the main shaft. A groove is provided on the side wall of the mounting ring, and a spring is installed in the groove. The slider is installed in the groove through the spring.

[0013] As Figure 2 shown, the slider is installed on the main shaft through the mounting ring. When the connecting block on the additional blade is not installed into the connecting groove, the spring needs to apply pressure to the slider to make the additional blade fit the end face of the blade, which helps the connecting block enter the connecting groove. After the connecting block is snapped into the connecting groove, under the thrust of the spring, the connecting block is clamped tightly in the connecting groove.

[0014] Furthermore, the driving device includes a cylinder. The cylinder is installed on the engine body, and the lever end of the cylinder is fixed on the mounting ring.

[0015] As Figure 1 and Figure 2 shown, under the push of the lever of the cylinder, the control mounting ring moves, thereby pushing the slider to slide on the main shaft. When it is necessary to increase the blade consistency, the cylinder pushes the slider to make the connecting block on the additional blade insert into the connecting groove, and the additional blade rotates along with the blade.

[0016] Furthermore, the fixing frame is a circular structure arranged on the back of the blade.

[0017] Compared with the prior art, the variable-consistency fan of a turbine engine of the present invention has the following advantages:

[0018] (1) For the variable-consistency fan of a turbine engine of the present invention, when it is necessary to increase the consistency of the blade, slide the mounting ring towards the blade, push the slider to slide, make the additional blade close to the blade. As the blade rotates, when the connecting block rotates to the position of the connecting groove, under the elastic force of the spring, the connecting block is snapped into the connecting groove, so that a part of the additional blade fits on the back of the blade, but the two are arranged staggeredly, playing the role of increasing the number of blades;

[0019] (2) For the variable-consistency fan of a turbine engine of the present invention, the fixing frame is a circular structure arranged on the back of the blade. When connecting the additional blade and the blade, first slide the connecting block against the surface of the fixing frame. During the rotation of the fixing frame, the connecting block slides on the surface of the fixing frame. When the connecting groove and the connecting block coincide, the connecting block can be smoothly snapped into the connecting groove to achieve smooth connection. Brief Description of the Drawings

[0020] The accompanying drawings, which form a part of the present invention, are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 is a schematic cross-sectional view of a variable consistency fan of a turbine engine according to an embodiment of the present invention;

[0022] Figure 2 is that described in the embodiment of the present invention Figure 1 is an enlarged schematic view of part A in

[0023] Description of reference numerals:

[0024] 1, main shaft; 2, blade fixing frame; 3, blade; 4, connecting groove; 5, additional blade; 6, connecting block; 7, slider; 8, mounting ring; 9, rotating groove; 10, rotating ring; 11, spring; 12, cylinder. Detailed implementation manners

[0025] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other.

[0026] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "mount", "connect", and "couple" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0028] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0029] As Figure 1 to Figure 2 shown, the present invention provides a technical solution: a variable pitch fan for a turbine engine, including a main shaft 1, with blades 3 fixed to the side of the main shaft 1. An installation ring 8 is slidably provided on the main shaft 1. A slider 7 is slidably provided on the side of the installation ring 8 close to the blades 3. A spring 11 is connected between the slider 7 and the installation ring 8. And a rotating ring 10 is rotatably provided on the slider 7. An additional blade 5 is fixed to the side of the rotating ring 10. A connecting block 6 is fixed to the side of the additional blade 5 close to the blades 3. A fixing frame 2 is fixed to the blades 3. The fixing frame 2 is provided with a connecting groove 4;

[0030] When it is necessary to increase the pitch of the blades 3, slide the installation ring 8 in the direction of the blades 3, push the slider 7 to slide, so that the additional blade 5 approaches the blades 3. As the blades 3 rotate, when the connecting block 6 rotates to the position of the connecting groove 4, under the elastic force of the spring 11, the connecting block 6 is snapped into the connecting groove 4, so that a part of the additional blade 5 fits against the back of the blades 3. However, the additional blade 5 and the blades 3 are arranged in an interleaved manner, which plays a role in increasing the number of blades. After connecting the additional blade 5 and the blades 3, the blades 3 drive the additional blade 5 to rotate. The additional blade 5 drives the rotating ring 10 to rotate around the slider 7. The rotating ring 10 is supported by the slider 7, the additional blade 5 is supported by the rotating ring 10, and the blades 3 are supported by the additional blade 5.

[0031] As Figure 1 and Figure 2 shown, the present invention is equipped with a pushing mechanism for sliding the installation ring 8.

[0032] As Figure 1 and Figure 2 shown, as a technical optimization solution of the present invention, a rotating groove 9 is provided on the side of the slider 7. The rotating ring 10 is rotatably connected to the rotating groove 9. The rotating groove 9 is an annular structure embedded in the side of the slider 7, so that the rotating ring 10 rotates in the rotating groove 9.

[0033] As a technical optimization solution of the present invention, the pushing mechanism includes a cylinder 12. One end of the cylinder 12 is fixedly connected to the body, and the other end of the cylinder 12 is fixedly connected to the installation ring 8. The cylinder 12 pushes the installation ring 8 to slide in the length direction of the main shaft 1.

[0034] As a technical optimization solution of the present invention, the rotating ring 10 and the main shaft 1 are coaxially arranged. A sliding groove is provided on the side of the installation ring 8 close to the slider 7. The slider 7 is slidably connected to the sliding groove.

[0035] As a technical optimization solution of the present invention, the blade fixing frame 2 is a circular structure arranged on the back of the blade 3. When connecting the additional blade 5 and the blade 3, first slide the connecting block 6 against the surface of the blade fixing frame 2. During the rotation of the blade fixing frame 2, the connecting block 6 slides on the surface of the blade fixing frame 2. When the connecting groove 4 and the connecting block 6 coincide, the connecting block 6 can be smoothly inserted into the connecting groove 4 to achieve a smooth connection.

[0036] Working principle: When it is necessary to increase the blade density of the blade 3 in the present invention, slide the mounting ring 8 towards the blade 3, push the slider 7 to slide, and make the additional blade 5 approach the blade 3. As the blade 3 rotates, when the connecting block 6 rotates to the position of the connecting groove 4, under the elastic force of the spring 11, the connecting block 6 is inserted into the connecting groove 4, so that the additional blade 5 fits on the back of the blade 3, and a part of the additional blade 5 fits on the back of the blade 3, but the additional blade 5 and the blade 3 are arranged in an alternating manner, playing the role of increasing the number of blades. The fixing frame 2 is a circular structure arranged on the back of the blade 3. When connecting the additional blade 5 and the blade 3, first slide the connecting block 6 against the surface of the blade fixing frame 2. During the rotation of the blade fixing frame 2, the connecting block 6 slides on the surface of the blade fixing frame 2. When the connecting groove 4 and the connecting block 6 coincide, the connecting block 6 can be smoothly inserted into the connecting groove 4 to achieve a smooth connection.

[0037] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A variable consistency fan for a turbomachine, characterized in that It includes an engine body, a fan mounted on the engine body, and an additional blade increasing assembly for increasing the fan density; The fan is mounted on the engine body through a main shaft (1), and the additional blade increasing assembly is mounted on the main shaft (1) and is located inside the fan; The additional blade increasing assembly includes a driving device and additional blades (5). Connecting grooves (4) are provided on the fan blades (3), and connecting blocks (6) corresponding to the connecting grooves (4) are provided on the additional blades (5). The additional blades (5) are clamped with the connecting grooves (4) of the fan blades (3) through the driving device, and the additional blades (5) and the fan blades (3) are arranged alternately to increase the fan density; The additional blades (5) are rotatably mounted on the main shaft (1) through sliders (7). The sliders (7) are sleeved on the main shaft (1), and rotating grooves (9) are provided on the side walls of the sliders (7). Rotating rings (10) are provided on the additional blades (5), and the rotating rings (10) are located in the rotating grooves (9); The sliders (7) are slidably mounted on the main shaft (1) through mounting rings (8). The mounting rings (8) are sleeved on the main shaft (1), grooves are provided on the side walls of the mounting rings (8), springs (11) are mounted in the grooves, and the sliders (7) are mounted in the grooves through the springs (11).

2. The variable consistency fan of a turbine engine according to claim 1, characterized in that: Fixing frames (2) are mounted on the inner walls of the fan blades (3). The connecting grooves (4) include a plurality of them and are equidistantly arranged on the fixing frames (2). The connecting blocks (6) are arranged on the end faces of the additional blades (5) adjacent to the fan blades (3), and the connecting blocks (6) are inserted into the connecting grooves (4).

3. A variable consistency fan for a turbine engine according to claim 1, characterized in that: The driving device includes a cylinder (12). The cylinder (12) is mounted on the engine body, and the lever end of the cylinder (12) is fixed on the mounting ring (8).

4. A variable consistency fan for a turbofan engine according to claim 2, wherein: The fixing frame (2) is a circular structure provided on the back of the fan blade (3).

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