Dustproof cover for tenon of turbine rotor blade

Abstract

The invention provides a turbine rotor blade tenon dust cover which is in an arch bridge shape or a similar shape, the size of the dust cover is determined according to the size of a vent groove in the bottom of a blade tenon, and the thickness of the dust cover is 0.5-1 mm; the dust cover is provided with circular or elliptical vent holes, and the size, the number and the arrangement of the vent holes are set according to specific conditions; the dustproof cover can be formed by punching and is lapped at the bottom of the tenon; the introduced cold air enters from the bottom of the tenon, after flowing into the dust cover, the cold air impacts the top of the dust cover, sand and dust are accumulated and coked at the top, then the coked sand and dust enter the blade through the vent holes, and the entered cold air is cleaner. The dust removal device has the advantages that fine impurities or dust can be effectively prevented from entering the turbine rotor blade, sufficient cooling is provided for the turbine rotor blade, safe operation of the turbine rotor blade is guaranteed, and the dust removal device is simple in structure, low in use cost, convenient and reliable to install and remarkable in effect.

Description

Technical Field

[0001] The invention relates to the field of dustproof design of turbine rotor blades of aircraft engines or gas turbines, and in particular to a dustproof cover for a tenon of a turbine rotor blade. Background Art

[0002] It is inevitable that aircraft engines or gas turbines will inhale impurities or dust during operation. After entering the flow channel, the impurities or dust will enter the air system with the air flow. The air system plays the role of cooling the hot end components of the engine. Part of the air in the air system will enter the turbine rotor blades for cooling the blades. The internal cooling structure of the turbine rotor blades is complex, and there are air film holes on the surface. The cold air enters the inside of the blades and flows out from the air film holes to form an air film, which plays a role in protecting the blades. Although the air system is equipped with a dust prevention device, there are still cases where fine impurities or dust enter the inside of the blades with the cold air. Impurities or dust gather at the air film holes, blocking the air film holes, which hinders the flow of cold air and fails to protect the blades, resulting in overheating of the blades and even ablation, and ultimately causing the blades to break, affecting the safety of aircraft engines or gas turbines.

[0003] Based on this, it is urgent to filter the cold air entering the turbine rotor blades to make the cold air clean and ensure the normal operation of the turbine rotor blades. Summary of the invention

[0004] The purpose of the present invention is to solve the problem of impurities or dust when cooling air of an aircraft engine or a gas turbine enters a turbine rotor blade, and a turbine rotor blade tenon dust cover is specially provided.

[0005] The present invention provides a turbine rotor blade tenon dust cover, the dust cover is an arch bridge shape or a similar shape, the size of the dust cover is determined according to the size of the ventilation groove at the bottom of the blade tenon, and the thickness of the dust cover is 0.5mm-1mm;

[0006] Ventilation holes are provided on the dust cover. The vent holes are circular or elliptical. The size, quantity and arrangement of the vent holes are set according to the specific situation.

[0007] The dust cover can be stamped and formed, overlapped at the bottom of the tenon, and fixed by welding. The number of welding points depends on the specific size;

[0008] The introduced cold air enters from the bottom of the tenon and flows into the dust cover. The cold air impacts the top of the dust cover, causing the sand and dust to accumulate and coke on the top. Then, it enters the inside of the blade through the air vents, causing the remaining sand and dust to accumulate in the gap between the dust cover and the inner wall of the tenon, making the incoming cold air cleaner.

[0009] Compared with the prior art, the present invention has the following advantages:

[0010] The dust cover of the tenon of the turbine rotor blade described in the present invention can effectively prevent fine impurities or dust from entering the turbine rotor blade, avoid impurities or dust from entering the inner cavity of the turbine rotor blade and blocking the air film holes, provide sufficient cooling for the turbine rotor blade, and ensure the safe operation of the turbine rotor blade. The dust removal device has a simple structure, low use cost, easy and reliable installation, and significant effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments:

[0012] Figure 1 : Front view of dust cover;

[0013] Figure 2 : Left view of dust cover;

[0014] Figure 3 : Top view of dust cover;

[0015] Figure 4 : Schematic diagram of dust cover assembled on blade tenon;

[0016] Figure 5 : Schematic diagram of dust prevention principle;

[0017] Figure 6 : Schematic diagram of the main dimensions of the dust cover;

[0018] In the figure, 1: blade tenon 2: dust cover 3: sand and dust 4: welding point. DETAILED DESCRIPTION

[0019] The present invention will be further explained below in conjunction with specific implementation plans, but the present invention is not limited thereto. The structures, proportions, sizes, etc. illustrated in the drawings of the specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the restrictive conditions under which the present invention can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0020] 1. Determine the dust cover size L1, L2 according to the size of the ventilation groove at the bottom of the blade tenon, and the thickness of the dust cover should be 0.5mm-1mm;

[0021] 2. Open vent holes on the dust cover. The diameter, number and arrangement of the vent holes are set according to the specific situation. The diameter of the vent holes in the attached figure is 5mm, with a total of 6 rows and 13 holes in each row;

[0022] 3. The dust cover can be stamped and formed. R1, R2, R3 and L3 are determined according to the specific situation. They are overlapped at the bottom of the tenon and can be fixed by welding. The number of welding points is determined according to the specific size.

[0023] 4. The introduced cold air enters from the bottom of the tenon and flows into the dust cover. The cold air impacts the top of the dust cover, causing the dust to accumulate and coke on the top. Then, it enters the blade through the vents, causing the remaining dust to accumulate in the gap between the dust cover and the inner wall of the tenon, making the incoming cold air cleaner. Figure 6 shown.

[0024] Matters not covered by the present invention are known technologies.

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A turbine rotor blade tenon dust cover, characterized in that: The turbine rotor blade tenon dust cover is in the shape of an arch bridge, and the thickness of the dust cover is 0.5mm-1mm; Ventilation holes are provided on the dust cover. The vent holes are circular or elliptical. The size, number and arrangement of the vent holes are set according to specific circumstances.

2. The turbine rotor blade tenon dust cover according to claim 1, characterized in that: The turbine rotor blade tenon dust cover is formed by stamping, overlapped at the bottom of the tenon, and fixed by welding, and the number of welding points is determined according to the specific size.

Images