阅读说明：本技术 涡轮叶片缘板阻尼器、涡轮叶片和航空发动机 (Turbine blade platform damper, turbine blade and aircraft engine ) 是由 江有为 范慧茹 郑李鹏 郭洪宝 于 2020-06-16 设计创作，主要内容包括：本发明涉及一种涡轮叶片缘板阻尼器、涡轮叶片和航空发动机,其中涡轮叶片缘板阻尼器包括阻尼器本体(10),阻尼器本体(10)包括第一阻尼块(11)和第二阻尼块(12),第一阻尼块(11)设置于涡轮叶片的缘板(20)上所设置的凹槽(21)中,第二阻尼块(12)与第一阻尼块(11)连接且设置于凹槽(21)外,阻尼器本体(10)可动地安装于缘板(20)上,阻尼器本体(10)被配置为能够运动至使第一阻尼块(11)与凹槽(21)的内壁以及第二阻尼块(12)与凹槽(21)的外壁同时接触的位置。涡轮叶片包括涡轮叶片缘板阻尼器。航空发动机包括涡轮叶片。本发明可以增加阻尼器与缘板的接触面积,从而增大摩擦力,改善减振效果。(The invention relates to a turbine blade flange damper, a turbine blade and an aircraft engine, wherein the turbine blade flange damper comprises a damper body (10), the damper body (10) comprises a first damping block (11) and a second damping block (12), the first damping block (11) is arranged in a groove (21) formed in a flange (20) of the turbine blade, the second damping block (12) is connected with the first damping block (11) and arranged outside the groove (21), the damper body (10) is movably mounted on the flange (20), and the damper body (10) is configured to be capable of moving to a position where the first damping block (11) is simultaneously contacted with the inner wall of the groove (21) and the second damping block (12) is simultaneously contacted with the outer wall of the groove (21). The turbine blade includes a turbine blade platform damper. Aircraft engines include turbine blades. The invention can increase the contact area between the damper and the flange plate, thereby increasing the friction force and improving the vibration reduction effect.)

1. A turbine blade platform damper comprising a damper body (10), said damper body (10) comprising:

a first damping mass (11) arranged in a groove (21) provided on a rim plate (20) of the turbine blade; and

the second damping block (12) is connected with the first damping block (11) and arranged outside the groove (21);

wherein the damper body (10) is movably mounted on the rim plate (20), the damper body (10) being configured to be movable to a position where the first damping mass (11) is in simultaneous contact with an inner wall of the groove (21) and the second damping mass (12) is in simultaneous contact with an outer wall of the groove (21).

2. The turbine blade platform damper as claimed in claim 1, wherein the contact surface between the first damping mass (11) and the inner wall of the groove (21) is a bevel inclined with respect to the radial direction of the turbine blade; and/or the contact surface between the second damping block (12) and the outer wall of the groove (21) is a plane perpendicular to the radial direction of the turbine blade.

3. The turbine blade platform damper as claimed in claim 1 wherein an end of said first damping mass (11) proximate a turbine blade is configured to close a gap between two adjacent turbine blades.

4. The turbine blade platform damper as recited in claim 1, wherein a clamping groove (13) is formed between the first damping block (11) and the second damping block (12), a side of the groove (21) away from the blade body (30) of the turbine blade is protruded relative to the platform (20) to form a boss (22), and the clamping groove (13) is clamped on the boss (22).

5. The turbine blade platform damper as claimed in claim 4 wherein a height of said snap groove (13) in a radial direction of the turbine blade is greater than a thickness of said boss (22) in the radial direction of the turbine blade.

6. Turbine bucket platform damper according to claim 1, wherein the damper body (10) is provided with a cavity (14).

7. The turbine bucket platform damper of claim 6 wherein the damper body (10) further includes a connecting rib (15), the connecting rib (15) connected between the first damping mass (11) and the second damping mass (12), the cavity (14) extending from the first damping mass (11) to the second damping mass (12) through the connecting rib (15).

8. The turbine bucket platform damper as claimed in claim 6 wherein said second damping mass (12) is provided with a cold air hole (16) communicating with said cavity (14).

9. The turbine blade platform damper according to claim 6, wherein a plurality of webs (17) are provided in the cavity (14).

10. A turbine blade comprising a turbine blade platform damper as claimed in any one of claims 1 to 9.

11. An aircraft engine comprising a turbine blade according to claim 10.

Technical Field

The invention relates to the technical field of aero-engines, in particular to a turbine blade edge plate damper, a turbine blade and an aero-engine.

Background

The turbine of the aircraft engine works in a severe environment with high temperature and high speed, and is easily subjected to a large vibration load in a working state, so that the service life of the blade is influenced, and therefore, the turbine blade needs to be subjected to vibration reduction design.

The turbine blade comprises a blade body, a flange plate, a root and a tenon, wherein the flange plate is used for connecting the blade body and the root. Conventionally, for vibration damping of turbine blades, a method of providing a shroud on a blade, a vibration damping boss on a blade body, a damper on a flange plate, or the like is generally employed. Shrouded blades introduce large centrifugal loads, causing strength problems; the vibration reduction boss is arranged on the blade body, which not only causes the strength problem, but also influences the airflow of the flow passage and influences the working efficiency of the turbine, so that the aeroengine turbine, especially a high-pressure turbine part, is frequently subjected to vibration reduction by arranging the damper on the edge plate.

The damper has a plate type, box type or block type structure, is generally placed in a cavity below the flange plate, and is contacted with the lower edge of the flange plate under the action of pre-applied pressure or centrifugal force, when the blade vibrates, relative displacement exists between the damper and the flange plate, so that friction is generated to absorb vibration energy. The existing damper has the problem of non-ideal damping effect.

It is noted that the information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.

Disclosure of Invention

The embodiment of the invention provides a turbine blade flange plate damper, a turbine blade and an aircraft engine, and the vibration reduction effect of the damper is improved.

According to one aspect of the present invention, there is provided a turbine blade platform damper comprising a damper body, the damper body comprising:

the first damping block is arranged in a groove arranged on the edge plate of the turbine blade; and

the second damping block is connected with the first damping block and arranged outside the groove;

wherein the damper body is movably mounted on the rim plate, the damper body being configured to be movable to a position where the first damping mass is in simultaneous contact with the inner wall of the groove and the second damping mass is in simultaneous contact with the outer wall of the groove.

In some embodiments, the contact surface between the first damping mass and the inner wall of the groove is a bevel that is inclined with respect to the radial direction of the turbine blade; and/or the contact surface between the second damping block and the outer wall of the groove is a plane perpendicular to the radial direction of the turbine blade.

In some embodiments, an end of the first damping mass proximate to the turbine blade is configured to close a gap between two adjacent turbine blades.

In some embodiments, a clamping groove is formed between the first damping block and the second damping block, one side of the groove, which is far away from the blade body of the turbine blade, protrudes relative to the flange plate to form a boss, and the clamping groove is clamped on the boss.

In some embodiments, a height of the snap groove in a radial direction of the turbine blade is greater than a thickness of the boss in the radial direction of the turbine blade.

In some embodiments, the damper body is provided with a cavity.

In some embodiments, the damper body further includes a connecting rib connected between the first damping mass and the second damping mass, the cavity extending from the first damping mass to the second damping mass via the connecting rib.

In some embodiments, the second damping block is provided with a cold air hole in communication with the cavity.

In some embodiments, a plurality of webs are disposed in the cavity.

According to another aspect of the present invention, a turbine blade is provided that includes the turbine blade platform damper described above.

According to a further aspect of the present invention there is provided an aircraft engine comprising a turbine blade as described above.

Based on the technical scheme, the first damping block and the second damping block are arranged, so that the first damping block can be in contact with the inner wall of the groove and the second damping block can be in contact with the outer wall of the groove at the same time.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

FIG. 1 is a schematic structural view of one embodiment of a turbine blade according to the present invention.

FIG. 2 is a schematic view of an embodiment of a turbine bucket platform damper according to the present invention.

FIG. 3 is a schematic view of another embodiment of the turbine bucket platform damper of the present invention.

FIG. 4 is a schematic view of an exemplary turbine bucket platform damper of the present invention in a non-operational configuration in cooperation with a platform.

FIG. 5 is a schematic view of an embodiment of a turbine bucket platform damper of the present invention in an operational configuration in cooperation with a platform.

In the figure:

10. a damper body; 20. a flange plate; 30. a leaf body; 40. a tenon;

11. a first damping block; 12. a second damping block; 13. a card slot; 14. a cavity; 15. connecting ribs; 16. cooling air holes; 17. a rib plate;

21. a groove; 22. and (4) a boss.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "central," "lateral," "longitudinal," "front," "rear," "left," "right," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the invention and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the scope of the invention.

As shown in FIGS. 1-3, in some embodiments of the present invention, a turbine blade platform damper is provided on a platform 20 of a turbine blade, the turbine blade includes a blade body 30, the platform 20, a tang, and a rabbet 40, the platform 20 is used to connect the blade body 30 and the tang, the rabbet 40 is disposed below the tang, and the turbine blade is mounted on a turbine disk via the rabbet 40.

The damper comprises a damper body 10, wherein the damper body 10 comprises a first damping block 11 and a second damping block 12, the first damping block 11 is arranged in a groove 21 formed in a flange 20 of the turbine blade, the second damping block 12 is connected with the first damping block 11 and arranged outside the groove 21, the damper body 10 is movably mounted on the flange 20, and the damper body 10 is configured to be capable of moving to a position where the first damping block 11 and the inner wall of the groove 21 and the second damping block 12 and the outer wall of the groove 21 are simultaneously in contact.

In the above embodiment, by providing the first damping block 11 and the second damping block 12, a state in which the first damping block 11 is in contact with the inner wall of the groove 21 and the second damping block 12 is in contact with the outer wall of the groove 21 at the same time can be provided, and compared with a scheme in which only one surface of the damper and the rim plate is in contact in the related art, the contact area between the damper and the rim plate 20 can be increased, so that the friction force is increased, and the vibration damping effect is improved.

In the above embodiment, the groove 21 is provided on the rim plate 20, including at least two cases: one is that the inner and outer walls of the groove 21 are part of the platform 20, and the other parts of the turbine blade include the parts that form the groove 21 with the platform 20.

In some embodiments, the first damping mass 11 and the second damping mass 12 are both solid structures to ensure the overall structural strength of the damper. The minimum thickness of the first damping block 11 and the second damping block 12 should be not less than 0.5mm_。

In some embodiments, the contact surface between the first damping mass 11 and the inner wall of the groove 21 is a slope inclined with respect to the radial direction of the turbine blade. Therefore, when the first damping block 11 vibrates, the first damping block is convenient to move under the guiding action of the inclined surface, the gap between two adjacent blades is sealed, meanwhile, compared with a plane, the contact area between the first damping block 11 and the flange plate 20 can be increased, the friction force is increased, and the vibration reduction capacity is improved.

Further, as can be seen from fig. 4 and 5, the side of the groove 21 close to the blade body 30 of the turbine blade gradually approaches the side of the groove 21 away from the blade body 30 from the notch to the groove bottom, which is advantageous in that the opening area of the groove 21 gradually decreases from the notch to the groove bottom, facilitating the installation of the first damping block 11, while the movement of the first damping block 11 can be guided by the slope.

In some embodiments, the side of the groove 21 remote from the main blade body 30 is a plane perpendicular to the radial direction of the turbine blade. When the turbine blade is in a non-working state, the first damping block 11 and one side of the groove 21 far away from the blade body 30 are in contact with each other, the contact surface is set to be a plane, and smooth contact between the first damping block 11 and the groove 21 can be achieved.

In some embodiments, the contact surface between the second damping mass 12 and the outer wall of the groove 21 is a plane perpendicular to the radial direction of the turbine blade. This arrangement is advantageous to ensure that the first damping mass 11 is in simultaneous contact with the inner wall of the groove 21 and the second damping mass 12 is in simultaneous contact with the outer wall of the groove 21.

In some embodiments, the end of the first damping mass 11 near the turbine blade is configured to be able to close the gap between two adjacent turbine blades. The gap between two adjacent turbine blades can be sealed through the first damping block 11, aerodynamic loss is reduced, and the working efficiency of the turbine is improved.

In some embodiments, one end of the first damping block 11 close to the turbine blade is in a triangular structure, and the end of the first damping block is provided with a fillet, so that the first damping block 11 can move to a position for sealing a gap between two blades when the turbine blade rotates, and a good sealing effect is achieved.

In some embodiments, a clamping groove 13 is arranged between the first damping block 11 and the second damping block 12, one side of the groove 21 away from the blade body 30 of the turbine blade protrudes relative to the flange plate 20 to form a boss 22, and the clamping groove 13 is clamped on the boss 22.

Through setting up draw-in groove 13, realized installing the effect in flange 20 with attenuator body 10 through draw-in groove 13, this kind of mounting means is fairly simple, and the reliability is high moreover, can also lighten the whole weight of attenuator through setting up draw-in groove 13.

By providing the locking groove 13, it is also possible to easily mount the first damping block 11 inside the groove 21 and the second damping block 12 outside the groove 21.

In some embodiments, the height of the snap groove 13 in the radial direction of the turbine blade is greater than the thickness of the boss 22 in the radial direction of the turbine blade.

As can be seen from fig. 4 and 5, the boss 22 is inserted into the slot 13, and after insertion, there is a movable gap between the boss 22 and the slot wall of the slot 13, so that the damper can move relative to the rim plate 20.

In some embodiments, the damper body 10 is provided with a cavity 14. By providing the cavity 14, the overall weight of the damper body 10 can be reduced.

As shown in fig. 2 and 3, the cavity 14 may be a through-hole structure extending through the front and back.

In some embodiments, the damper body 10 further includes a connecting rib 15, the connecting rib 15 is connected between the first damping mass 11 and the second damping mass 12, and the cavity 14 extends from the first damping mass 11 to the second damping mass 12 through the connecting rib 15. Namely, the cavity 14 penetrates through the first damping block 11, the connecting rib 15 and the second damping block 12, so as to increase the volume of the cavity 14 as much as possible and reduce the weight of the damper.

In addition to vibration problems, turbine blades are also subjected to high temperature operating conditions, and typically the blade body 30 of the turbine blade is provided with film holes to cool the turbine blade.

In order to also cool the damper and the platform 20, in some embodiments the second damping mass 12 is provided with a cold air hole 16 communicating with the cavity 14. By arranging the cold air holes 16, part of cold air for cooling the blade body 30 can be conveyed to the damper and the flange plate 20 through the cold air holes 16, so that the damper and the flange plate 20 are cooled, the damper and the flange plate 20 are prevented from being influenced by high temperature, and the service life of the damper and the flange plate 20 is prolonged.

The cold air holes 16 are formed in the second damping block 12, but not in the first damping block 11, so that the cold air directly flows out through the cold air holes in the first damping block 11 and cannot reach the function of cooling the damper and the flange 20.

In some embodiments, as shown in FIG. 3, a plurality of ribs 17 are provided in the cavity 14. Through setting up gusset 17, can improve the structural strength of attenuator body 10, avoid the too low and take place the viscous phenomenon with the turbine blade of structural strength of attenuator body 10, improve the life of attenuator.

The cavity 14 is divided into a plurality of small cavities by a plurality of rib plates 17, and each small cavity is correspondingly provided with at least one cold air hole 16.

The number and the size of the rib plates 17 can be flexibly adjusted according to actual requirements.

In some embodiments, the damper body 10 may be made of a high temperature nickel-based alloy, a ceramic matrix composite, or the like.

The structure and operation of an embodiment of the turbine blade platform damper of the present invention will be described with reference to fig. 1 to 5:

as shown in fig. 1 to 3, the damper body 10 includes a first damping block 11 and a second damping block 12, the first damping block 11 is inserted into the groove 21, the second damping block 12 is located outside the groove 21, and the damper body 10 is clamped on the boss 22 through the clamping groove 13.

The first damping block 11 and the second damping block 12 are connected through a connecting rib 15, a cavity 14 penetrating through the first damping block 11, the connecting rib 15 and the second damping block 12 is formed in the damper body 10, and a cold air hole 16 communicated with the cavity 14 is formed in the second damping block 12. A plurality of rib plates 17 are arranged in the cavity 14, the cavity 14 is divided into a plurality of small cavities by the plurality of rib plates 17, and each small cavity is correspondingly provided with at least one cold air hole 16.

The inclined angle of the upper inclined plane of the first damping block 11 is consistent with that of the upper inclined plane of the groove 21, and the lower surface of the first damping block 11 and the upper surface of the boss 22, and the upper surface of the second damping block 12 and the lower surface of the boss 22 are all planes perpendicular to the radial direction of the turbine blade.

Wherein "up" is the direction toward the blade body 30, and "down" is the direction away from the blade body 30.

In the radial direction, the height of the groove 21 is greater than the thickness of the boss 22.

As shown in fig. 4, when the turbine blade is in a stationary state (non-operating state), a gap is provided between the upper inclined surface of the first damping block 11 and the upper inclined surface of the groove 21, the lower surface of the first damping block 11 and the upper surface of the boss 22 contact each other, and a gap is provided between the upper surface of the second damping block 12 and the lower surface of the boss 22.

As shown in fig. 5, when the turbine blade is in a rotating state (operating state), the upper inclined surface of the first damping block 11 and the upper inclined surface of the groove 21 contact each other, a gap is provided between the lower surface of the first damping block 11 and the upper surface of the boss 22, and the upper surface of the second damping block 12 and the lower surface of the boss 22 contact each other.

When the engine rotates, the turbine blades enter a rotating state, the damper radially displaces under the action of centrifugal load, the first damping block 11 slides along the upper inclined plane of the groove 21, after the first damping block 11 moves for a certain distance, the first damping block 11 is in contact with adjacent blades, the end part round angle of the first damping block 11 blocks a gap between the two adjacent blades, the turbine blades continuously rotate, and centrifugal force is always applied to the damper, so that in the vibration process of the turbine blades, although certain displacement change can occur between the turbine blades, the damper always keeps certain sealing effect under the action of the centrifugal force, the air flow loss in a turbine runner is effectively reduced, and the working efficiency of the turbine is improved; meanwhile, under the action of centrifugal load, the first damping block 11 is in contact with the upper inclined surface of the groove 21, and the rising height of the first damping block 11 is the same as the size of the gap between the upper surface of the second damping block 12 and the lower surface of the boss 22 in a static state, so that the upper surface of the second damping block 12 is also in contact with the lower surface of the boss 22 at the moment. The damper dissipates vibration energy through friction of two contacts, and meanwhile cooling gas can reach the damper body 10 and the flange plate 20 through the cold air holes 16, so that the damper and the flange plate 20 are cooled, and the service life of the flange plate 20 of the turbine blade and the damper is prolonged.

In the embodiment, the damper has a simpler structure, is convenient to process and assemble; the contact area between the damper and the edge plate is increased, and the vibration reduction effect is better; the first damping block also has a sealing effect, so that the influence of the clearances among the blades on the working efficiency of the turbine is avoided; the damper body is provided with a cavity, and the rib plate is arranged in the cavity, so that the mass is reduced, and meanwhile, a certain structural rigidity can be ensured; the second damping piece is provided with a cold air hole, and the flange plate and the damper can be cooled through cooling air.

Based on the turbine blade platform damper, the invention also provides a turbine blade, which comprises the turbine blade platform damper.

Based on the turbine blade, the invention also provides an aircraft engine which comprises the turbine blade.

The positive technical effects of the turbine blade platform damper in the above embodiments are also applicable to turbine blades and aircraft engines, and are not described in detail here.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made without departing from the principles of the invention, and these modifications and equivalents are intended to be included within the scope of the claims.