Power turbine disc with built-in framework structure

Abstract

The utility model discloses a power turbine disc with a built-in framework structure, which comprises turbine blades and a blade disc body, a built-in framework is arranged in the blade disc body, an internal cavity is arranged in the blade disc body, a positioning bushing is arranged on the axial outer part of the blade disc body, an internal spline is arranged on the inner rim of the blade disc body, and a plurality of internal threads are arranged on the internal spline. A smooth shaft hole is formed in the axis of the positioning bush, a balance adjusting hole is formed in one side of the positioning bush, and the outer edge of the blade disc body is connected with the root of a turbine blade. A built-in framework structure is adopted, and the weight of the power turbine is reduced. And meanwhile, the stress at the joint is reduced by adopting an internal spline structure.

Description

Technical Field

[0001] The utility model relates to the technical field of engine turbines, in particular to a power turbine disc with a built-in skeleton structure. Background Art

[0002] A turbine engine is a type of internal combustion engine that uses rotating components to extract kinetic energy from the fluid passing through it. It is commonly used as an engine for aircraft, large ships, and vehicles. All turbine engines have three main components: a compressor, a combustion chamber, and a turbine (hence the name "turbine engine").

[0003] The power turbine is a type of impeller machine in a gas turbine engine. It converts the energy of the combustion gas through the turbine blades into mechanical work to drive external loads such as propellers. It is a type of turbine. The power turbine is not connected to the core engine. In turboprop engines, it is directly connected to the propeller's speed reducer. In turboshaft engines, it is sometimes connected directly to the rotor (for helicopters with direct shaft power output) or to the speed reducer (for helicopters equipped with speed reducers). It is a core component of the gas turbine engine's power unit. Existing power turbines are limited by traditional forging and casting processes, making their complex internal structures difficult to machine. Consequently, most use a solid design. This results in a higher overall weight for the power unit, with the blades accounting for a high proportion of the weight. Internal stress analysis shows that the central portion carries less stress, and a solid internal structure reduces the load on the turbine disc. Furthermore, due to the design characteristics of the power turbine, low energy conversion efficiency is a disadvantage. Furthermore, the power turbine is subject to significant gas impact forces during the energy conversion process, and its high rotational speed puts significant stress on the connection with the shaft during rotation. Utility Model Content

[0004] The problem to be solved by the present invention is to provide a power turbine disk with an internal skeleton structure. The internal skeleton structure reduces the overall weight of the power turbine disk and effectively improves the energy conversion efficiency of the turbine. The internal gear structure is used for fixing, reducing the stress at the connection of the power turbine.

[0005] The present invention provides the following technical solutions to solve the above problems: a power turbine disk with an internal skeleton structure, comprising turbine blades and a blade disk body; a built-in skeleton is provided inside the blade disk body; an internal cavity is provided inside the blade disk body; a positioning bushing is provided axially outside the blade disk body; an internal spline is provided on the inner rim of the blade disk body; a smooth shaft hole is provided at the axis center of the positioning bushing; a balance adjustment hole is provided on one side of the positioning bushing; and the outer edge of the blade disk body is connected to the root of the turbine blade.

[0006] Preferably, the inner rim of the blade disk body adopts an 18-tooth internal spline structure.

[0007] Preferably, 31 turbine blades are provided on the blade disk body.

[0008] Preferably, the interior of the blade disk body is provided with 16 internal skeletons and 16 internal cavities. The thickness of the blade disk body decreases first and then increases from the axis to the rim.

[0009] Preferably, the positioning bushing has 16 balance adjustment holes evenly distributed in a circle.

[0010] Preferably, the smooth shaft hole is arranged at the front and rear of the positioning bushing, the smooth shaft hole coincides with the axis of the positioning bushing, and the aperture of the smooth shaft hole is consistent with the top circle of the spline of the inner rim of the blade disk body.

[0011] Preferably, the turbine blade has an overall curvature, the front and rear ends of the turbine blade are semicircular, and the thickness of the blade gradually increases from the upper end to the lower end.

[0012] Compared with the prior art, the advantages of the present invention are:

[0013] 1. This utility model utilizes a built-in turbine skeleton structure, which reduces the overall weight of the turbine impeller while ensuring the overall strength of the turbine blade disc, thereby reducing the overall weight of the engine. The manufacturing process involved in this utility model is additive manufacturing technology, which can effectively save materials during the manufacturing process, thereby further reducing costs.

[0014] 2. The utility model adopts an internal spline structure, which can change the mechanical connection of the power turbine from the traditional sleeve fixation to the spline connection, thereby improving the stability and reliability of the fixation, and converting the original fixation method relying on friction force into a fixation method that is fixed by the combined action of material shear force and friction force, thereby reducing the tangential stress on the connection and increasing the service life of the parts.

[0015] 3. The utility model adopts a balance adjustment hole. Under the premise of avoiding external stress concentration, the balance adjustment hole is drilled inside the shaft hole. The dynamic balance adjustment can be completed by adjusting the depth of the balance adjustment hole. The dynamic balance deweighting is formed by removing material to eliminate the imbalance, thereby ensuring that the power turbine can rotate stably at high speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present invention and constitute a part 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 on the present invention.

[0017] Figure 1It is the main view of the utility model;

[0018] Figure 2 It is a top view of the utility model;

[0019] Figure 3 It is a main sectional view of the utility model;

[0020] Figure 4 It is a three-dimensional diagram of the utility model;

[0021] Figure 5 It is a side sectional view of the utility model.

[0022] The attached drawings are marked as follows: 1. turbine blade; 2. blade disc body; 3. internal skeleton; 4. internal cavity; 5. smooth shaft hole; 6. balance adjustment hole; 7. positioning bushing. DETAILED DESCRIPTION

[0023] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0024] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0025] In the description of this utility model, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0026] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0027] The utility model includes:

[0028] Turbine blade 1; blisk body 2; internal skeleton 3; internal cavity 4; smooth shaft hole 5; balance adjustment hole 6; positioning bushing 7.

[0029] Specifically, the inner part of the blisk body 2 is provided with an internal skeleton 3, the inner part of the blisk body 2 is provided with an internal cavity 4, the outer part of the blisk body is connected to a positioning bushing 7, the axis of the positioning bushing 7 is provided with a smooth shaft hole 5, and one side of the positioning bushing 7 is provided with a balance adjustment hole 6. The blisk body 2 is connected to the root of the turbine blade 1. The above content can be referred to Figure 1 、 4 .

[0030] Specifically, the inner rim of the blade disc body 2 adopts an 18-tooth internal spline structure. Figure 3 .

[0031] Specifically, the blade disc body 2 is provided with 31 turbine blades 1. The above content can be referred to Figure 3 .

[0032] Specifically, the blade disc body 2 is provided with 16 internal skeletons 3 and 16 internal cavities 4. The thickness of the blade disc body 2 decreases first and then increases from the axis to the rim. Figure 3 .

[0033] Specifically, there are 16 balance adjustment holes 6 evenly distributed in a circle on the positioning bushing 7. Figure 1 .

[0034] Specifically, the smooth shaft hole 5 is provided at the front and rear of the positioning bushing 7, the smooth shaft hole 5 coincides with the axis of the positioning bushing 7, and the aperture of the smooth shaft hole 5 is consistent with the top circle of the inner rim spline of the blade disk body 2. Figure 1 、 3 .

[0035] Specifically, the turbine blade 1 has an overall curvature, the front and rear ends of the turbine blade 1 are semicircular, and the thickness of the blade gradually increases from the upper end to the lower end. Figure 5 .

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A power turbine disk with an internal skeleton structure, characterized by: The invention comprises a turbine blade (1) and a blade disk body (2), wherein a built-in skeleton (3) is provided inside the blade disk body (2), an internal cavity (4) is provided inside the blade disk body (2), a positioning bushing (7) is connected to the outside of the blade disk body, a smooth shaft hole (5) is provided at the axis of the positioning bushing (7), a balance adjustment hole (6) is provided on one side of the positioning bushing (7), and the blade disk body (2) is connected to the root of the turbine blade (1).

2. The power turbine disk with an internal skeleton structure according to claim 1, characterized in that: An 18-tooth internal spline structure is adopted on the inner rim of the blade disc body (2).

3. The power turbine disk with an internal skeleton structure according to claim 1, characterized in that: 31 turbine blades (1) are arranged on the blade disk body (2).

4. The power turbine disk with an internal skeleton structure according to claim 1, characterized in that: The blade disc body (2) is provided with 16 internal frames (3) and 16 internal cavities (4). The thickness of the blade disc body (2) decreases first and then increases from the axis to the rim.

5. The power turbine disk with an internal skeleton structure according to claim 1, characterized in that: The positioning bushing (7) is provided with 16 balance adjustment holes (6) evenly distributed in a circle.

6. The power turbine disk with an internal skeleton structure according to claim 1, characterized in that: The smooth shaft hole (5) is arranged at the front and rear of the positioning bushing (7), the smooth shaft hole (5) coincides with the axis of the positioning bushing (7), and the aperture of the smooth shaft hole (5) is consistent with the top circle of the inner wheel rim spline of the blade disk body (2).

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