CN105134303A - Turbine blade edge plate with matched paired rectangular teeth - Google Patents

Abstract

The invention discloses a turbine blade edge plate matched with a pair of rectangular teeth, which comprises a blade and an edge plate; an edge plate is installed at the bottom of each blade; Every two turbine blades are divided into one group, and the two edge plates in each group of blades are installed opposite to each other, the opposite side is a rectangular tooth that meshes with each other, and the other side of the two edge plates is a planar structure; each pair of edge plates The planar structure of the adjacent group of edge plates cooperates with the planar structure to form a planar contact. The advantage is that the rigidity of the blade is increased and the natural frequency of the blade is increased through the meshing of the rectangular toothed edge plates; when the plane contact of different sets of edge plates absorbs vibration energy through mutual friction when the blade vibrates, it plays a role in vibration reduction. effect.

Description

A turbine blade edge plate with matching pairs of rectangular teeth

technical field

The invention is aimed at the edge plate of a turbine blade, belongs to the technical field of mechanical damping and vibration reduction structures, and particularly relates to a turbine blade edge plate with paired rectangular teeth matching.

Background technique

The working environment of the turbine blades of aero-engines is harsh. They not only have to withstand the scour of high-temperature, high-pressure, and high-speed gas, but also withstand the impact of periodic changes in the gas nozzle while rotating. The breakage of turbine rotor blades due to overall stiffness, strength, vibration and other reasons has occurred many times in domestic and foreign flight accidents. In order to enhance the overall stiffness and anti-vibration performance of turbine blades, reduce the maximum vibration stress of turbine rotor blades, and prolong their service life, it is necessary to add dampers to the edge plates of turbine blades.

Contents of the invention

In order to improve the contact damping of the traditional planar edge plate and the stiffness of the whole ring blade, the invention proposes a turbine blade edge plate with a pair of rectangular teeth matching which is easy to install and has a good vibration damping effect.

A turbine blade edge plate fitted with pairs of rectangular teeth, one edge plate is installed at the bottom of each blade; one side of the edge plate is rectangular teeth, and the opposite side is a plane structure.

The number of turbine blades can be divided into odd number and even number. For even number of turbine blades, every two turbine blades are divided into one group, and the two edge plates in each group of blades are installed oppositely.

For the turbine blade edge plate in a group of blades, the opposite sides are multiple pairs of rectangular teeth meshing with each other, and the number of meshing teeth of the rectangular teeth differs by 1;

Specifically: the rectangular teeth of one edge plate are located on the blade pot side of the blade, and the rectangular teeth of the other edge plate are located on the back side of the blade; the thickness of the meshing rectangular teeth and the edge plate of the turbine blade remains the same.

The tooth width value of the rectangular tooth is determined by the area of friction required for damping and the overall stiffness of the blade. The width is calculated by dividing the length of the edge plate side where the rectangular tooth is located by the integer n, and n is usually 3-8 according to the requirements;

The tooth depth of the rectangular tooth is selected according to the integer n, the smaller the value of n, the greater the depth, and the value of n takes the blade outline that does not touch the blade root as the limit value to ensure the contact area.

The number of rectangular teeth is determined by the numerical simulation results or experimental test results of the damping and vibration reduction effect.

The other side of each pair of edge plates is a planar structure, which cooperates with the planar structure of the adjacent set of edge plates to form planar contact.

For an odd number of turbine blades, after pairing two of the edge plates, the remaining edge plate selects a planar structure with the same size as the rest of the edge plates, and directly cooperates with the planar structures of the two adjacent paired edge plates to form Planar contact finally makes the shroud of the entire turbine blade compressed into a whole ring structure.

The advantages of the present invention are:

1) A turbine blade edge plate matched with pairs of rectangular teeth in the present invention enhances the overall rigidity and anti-vibration performance of the turbine blade, reduces the maximum vibration stress of the turbine rotor blade, and prolongs its service life.

2) A turbine blade edge plate with matching pairs of rectangular teeth in the present invention adopts a rectangular tooth edge plate structure, which is not only convenient for installation, but also increases the contact surface between the blades.

3) According to the present invention, a turbine blade edge plate with pairs of rectangular teeth matched, this structure can provide a good damping effect, and can also better enhance the stiffness of the blade.

Description of drawings

Fig. 1 is the rectangular tooth of the turbine blade edge plate that the paired rectangular tooth of the present invention cooperates in the blade basin direction schematic diagram;

Fig. 2 is the cooperation schematic diagram of the turbine blade edge plate that the paired rectangular teeth of the present invention cooperate;

Fig. 3 is a schematic diagram of a turbine blade shroud and edge plate fitted with pairs of rectangular teeth according to the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings.

The present invention is a turbine blade edge plate with a pair of rectangular teeth, which is developed on the basis of the plane contact edge plate, as shown in Figure 1 and Figure 2, including the blade and the edge plate; the number of blades and the edge plate The number is the same; each edge plate is cast on the bottom of a blade; one side of the edge plate is rectangular teeth, and the opposite side is a plane structure; the other sides can be corrugated, straight, zigzag and other conventional shapes.

The number of turbine blades is divided into odd and even numbers. For even number of turbine blades, every two turbine blades are placed in pairs as a group; the opposite sides of the two turbine blade edge plates are mutually meshed. Multiple pairs of rectangular teeth, the meshing section of which is a rectangular straight tooth structure, the number of meshing teeth of the two turbine blade edge plates in one group differs by 1; the non-meshing surface of the other side of the two turbine blade edge plates is a plane structure, and the The plane structures of the edge plates of the turbine blades are in direct contact with each other. That is, the other sides of the two turbine blade edge plates cooperate with the other side of the turbine blade edge plates of another group of multiple pairs of rectangular teeth to form plane contact.

The position of each group of edge plates is as follows: the meshing rectangular teeth of one turbine blade edge plate are located on the blade pot side of the blade, and the meshing rectangular teeth of the other turbine blade edge plate are located on the back side of the blade; the meshing rectangular teeth and the turbine blade The thickness of the flange remains the same throughout.

The tooth width of the meshing rectangular teeth is the leading edge of the protruding rectangular teeth. The width is determined by the friction area required for damping and the overall stiffness of multiple blades. The width is calculated by dividing the length of the edge plate side where the rectangular teeth are located by the integer n, n is usually 3-8 according to the demand;

The tooth depth of the meshing rectangular teeth is perpendicular to the width of the rectangular teeth. The depth is selected according to the integer n. The smaller the value of n, the larger the depth. The limit value is the blade outline that does not touch the blade root to ensure the contact area. The number of meshing teeth is determined by the numerical simulation results or experimental test results of the damping and vibration reduction effect.

For an odd number of turbine blades, after pairing two of the edge plates, the remaining edge plate selects a planar structure with the same size as the rest of the edge plates, and directly cooperates with the planar structures of the two adjacent paired edge plates to form Planar contact finally makes the edge plates of the entire turbine blade compressed into a full ring structure.

As shown in Figure 3, the solution of paired rectangular teeth matching of the present invention is not only applied to the blade crown of the turbine blade, but also can be applied to the edge plate of the turbine blade in the same way, or both the blade crown and the edge plate of the turbine blade adopt rectangular teeth and when both the blade crown and the edge plate of the turbine blade are fitted with rectangular teeth, the matching parts of the rectangular teeth can also be arranged in a staggered manner.

The invention relates to a turbine blade edge plate with multiple pairs of rectangular teeth, wherein a group of edge plates meshing with each other can increase the rigidity of the blade and improve the natural vibration frequency of the blade; when the plane contact of different sets of edge plates vibrates, the mutual The friction between them absorbs vibration energy and acts as a damper. This structure can be applied to engine turbine blades of various sizes of thrust/power for civil aircraft/military aircraft; it can improve the stiffness and anti-vibration performance of the blades, and prolong the service life of the blades.

Claims (6)

1. A turbine blade edge plate matched with a pair of rectangular teeth, characterized in that: an edge plate is installed at the bottom of each blade; the edge plate is designed with rectangular teeth on one side, and the opposite side is a planar structure; Every two blades are divided into one group, the rectangular teeth of the two edge plates in each group of blades are arranged oppositely and meshed with each other, and the planar structures of the adjacent edge plates in the adjacent two groups of blades are matched and contacted. 2. A turbine blade edge plate with paired rectangular teeth as claimed in claim 1, wherein when there are an odd number of said blades, the opposite sides of the remaining edge plate all adopt a planar structure, respectively and The plane structures of the middle edge plates of two adjacent groups of blades are matched and contacted. 3. A turbine blade edge plate with paired rectangular teeth as claimed in claim 1, characterized in that: said edge plate is specifically installed as follows: the rectangular teeth of one edge plate in each group of blades are located on the blade of the blade where it is located On the side of the pot, the rectangular teeth of the other edge plate are located on the back side of the blade; and the number of teeth of the rectangular teeth of the two edge plates differs by 1. 4. A turbine blade edge plate with paired rectangular teeth as claimed in claim 1, wherein the tooth width of the rectangular tooth is the length of the edge plate side where the rectangular tooth is located divided by the integer n, n 3 to 8. 5. A turbine blade edge plate with paired rectangular teeth as claimed in claim 1, characterized in that: the tooth depth of the rectangular teeth does not need to touch the blade outline of the blade root. 6. A turbine blade edge plate with paired rectangular teeth as claimed in claim 1, wherein the thickness of the rectangular teeth is the same as that of the edge plate.