Structure for improving air tightness between air-cooled turbine blade tenon and wheel disc

Abstract

According to the structure for improving the air tightness between the air-cooled turbine blade tenon and the wheel disc, on the basis of an original air-cooled turbine blade and wheel disc assembling structure, a concave piece sealing structure is additionally arranged on the premise of minimum change, and the sealing performance of the air-cooled turbine blade tenon and the wheel disc is improved. Cooling air which is led out from a turbine disc cooling channel and enters a turbine blade tenon can be effectively prevented from leaking out from a large gap between the blade tenon and a turbine disc mortise. The method is suitable for improving a structure with small space and large clearance between a turbine blade tenon and a wheel disc; the simple structural improvement can effectively prevent cooling air from leaking from the position between the blade tenon and the wheel disc mortise. The device is wide in applicability and can be popularized and applied to improvement of various similar structures, cold air leakage is reduced, and air tightness is improved. The method has the advantages that leakage of cooling air is reduced, mixing of the cooling air and fuel gas is reduced, performance loss of turbine parts is reduced, the overall investment is small, the effect is obvious, and the overall cost performance is very high.

Description

Technical Field

[0001] The invention relates to the technical field of aeroengines, and in particular to a structure for improving the air tightness between a tenon of an air-cooled turbine blade and a wheel disc. Background Art

[0002] Air-cooled turbine blades of aircraft engines are assembled by inserting the tenons into the tenons of turbine discs. Cold air passes through the cold air channel inside the turbine disc and enters the hole at the bottom of the tenon of the turbine blade to cool the turbine blade. There is a large gap in the radial direction between the bottom of the tenon of the turbine blade and the bottom of the tenon of the turbine disc at this position, which can reach 1.5 to 2.5 mm. Therefore, cold air can leak out from the gap through the side of the wheel disc. In view of this situation, a small sealing sheet structure is added to cover the radial gap between the blade tenon and the wheel disc tenon with minimal improvement to the original wheel disc, blades, and lock plates / baffles, and the sealing sheet is structurally compressed through the blades or lock plates / baffles to seal the cooling air and reduce cooling air leakage. Summary of the invention

[0003] The purpose of the present invention is to improve the air tightness of the existing cooling system by improving the original structure and locally adding sealing devices, effectively reduce the leakage of cooling gas, and reduce the performance loss of turbine components. A structure is specially provided to improve the air tightness between the tenon and the wheel disc of an air-cooled turbine blade.

[0004] The present invention provides a structure for improving the air tightness between the tenon of an air-cooled turbine blade and a wheel disc. Based on the original assembly structure of the air-cooled turbine blade and the wheel disc, a concave sheet sealing structure is added with minimal changes, which can effectively prevent the cooling air drawn out from the turbine disc cooling channel and entering the turbine blade tenon from leaking out from the large gap between the blade tenon and the turbine disc tenon groove.

[0005] The first part is to improve the original wheel disc structure, adjust the wheel rim part along the axis upward or add a part of the boss structure, and adjust the size and the boss size according to the structural thickness of the newly added sealing sheet.

[0006] The second part is the improvement of the original blade tenon structure. The original axial size of the tenon is slightly adjusted, and a fixed sealing plate boss structure is added.

[0007] The third part, the locking plate / fixing ring structure for fixing the blades, is adjusted with the added sealing sheet structure.

[0008] The fourth part is the newly designed sealing sheet, which is adjusted according to the size of the installation structure at the bottom of the tenon. The thickness of the sealing sheet is about 2mm to meet the needs. The specific structure of the front and rear sealing sheets is determined according to the blade tenon.

[0009] The fifth part is to assemble all the parts mentioned above to achieve the effect of sealing the cooling gas.

[0010] Suitable for structures with small improvement space and large gap between turbine blade tenon and wheel disc;

[0011] Simple structural improvements can effectively block the leakage of cooling air from the blade tenon and the wheel tenon groove;

[0012] The invention has wide applicability and can be applied to the improvement of various similar structures to reduce cold air leakage and improve air tightness.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] The structure for improving the air tightness between the tenon and the wheel disc of the air-cooled turbine blade described in the present invention effectively reduces the leakage of cooling air, reduces the mixing of cooling air and fuel gas, and effectively reduces the performance loss of turbine components. Since the overall workload of improved design and modification is small, the overall modification investment is small, the effect is obvious, and the overall cost performance is very high. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments:

[0016] Figure 1 This is a schematic diagram of the original wheel disc-blade assembly structure;

[0017] Figure 2 The schematic diagram of the improved rear wheel disc-blade-seal assembly structure;

[0018] Figure 3 The schematic diagram of the improved structure of the roulette wheel is provided;

[0019] Figure 4 This is a schematic diagram of the blade improvement structure;

[0020] Figure 5 It is a schematic diagram of the improved structure of the lock plate / fixing ring;

[0021] Figure 6 A schematic diagram of the structure of a newly added sealing sheet is shown;

[0022] Figure 7 Schematic diagram of the final assembly relationship of the improved structure. DETAILED DESCRIPTION

[0023] 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.

[0024] The invention is completed by improving the design of multiple details. Sealing sheets are added to the sides of the blade tenon and the wheel tenon groove to prevent the cooling air used to cool the blade from leaking out from the sides of the blade tenon and the wheel tenon groove. The specific structural improvements are divided into the following parts:

[0025] The first part is the improvement of the original wheel disc structure. The wheel rim is adjusted upward along the axis or a part of the boss structure is added. The adjustment size and boss size are adjusted according to the structural thickness of the newly added sealing sheet. Figure 3 shown.

[0026] The second part is the improvement of the original blade tenon structure, the original axial size of the tenon is slightly adjusted, and a fixed sealing plate boss structure is added. Figure 4 shown.

[0027] The third part, the locking plate / fixing ring structure for fixing the blades, is adjusted with the added sealing plate structure. Figure 5 shown.

[0028] The fourth part is the newly designed sealing sheet, which is adjusted according to the size of the installation structure at the bottom of the tenon. The thickness of the sealing sheet is about 2mm to meet the needs. The specific structure of the front and rear sealing sheets is determined according to the blade tenon. Figure 6 shown.

[0029] The fifth part is to assemble all the above-mentioned parts to achieve the effect of sealing the cooling gas. Figure 7 shown.

[0030] Matters not covered by the present invention are known technologies.

[0031] 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 structure for improving the air tightness between the tenon and the wheel disc of an air-cooled turbine blade, characterized in that: The structure for improving the air tightness between the tenon of the air-cooled turbine blade and the wheel disc comprises the following parts: In the first part, the rim part of the wheel disc structure is adjusted upward along the axis or a part of the boss structure is added, and the adjustment size and the boss size are adjusted according to the structural thickness of the newly added sealing sheet; In the second part, the original axial dimension of the blade tenon structure is adjusted, and a fixed sealing plate boss structure is added; The third part, the locking plate / retaining ring structure for fixing the blades, is adjusted with the added sealing sheet structure; In the fourth part, the sealing piece is adjusted according to the size of the installation structure at the bottom of the tenon. The thickness of the sealing piece is about 2mm to meet the needs. The specific structure of the front and rear sealing pieces is determined according to the tenon of the blade; The fifth part is to assemble all the parts mentioned above to achieve the effect of sealing the cooling gas.

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