A turbomachinery impeller structure

Abstract

The present invention discloses a turbine impeller structure, comprising a hub and a plurality of blades fixed on the hub, characterized in that each of the blades comprises a blade body and a blade split, and a blade split is fixed on each blade body at the blade tip located at the blade inlet edge. Aiming at the problem of vibration and induced noise of turbine impeller blades of a cantilever structure of the same material, the present invention provides a turbine impeller structure of a cantilever structure. The turbine machine adopting the structure of the present invention has low vibration and low noise performance, and can reduce the vibration of the blades under the action of unsteady forces and the induced noise.

Description

Technical Field

[0001] The invention relates to a turbine machinery impeller structure and belongs to the field of turbine machinery. Background Art

[0002] The core component of a turbine machine is an impeller with several thin blades, which are mounted on the hub to form a cantilever structure. In order to facilitate molding, the impeller is generally made of the same material as a whole. When the impeller rotates at high speed around the axis, the fluid and the blades interact with each other to convert energy; under the action of this unsteady force, the thin blades of the cantilever structure will produce greater vibration and noise at the blade tip away from the hub, and the blade as a whole will also produce greater vibration and noise. Summary of the invention

[0003] The technical problem to be solved by the present invention is: how to reduce the vibration and noise generated by the blade tip far away from the hub.

[0004] In order to solve the above technical problems, the technical solution of the present invention is to provide a turbine machinery impeller structure, including a hub and a plurality of blades fixed on the hub, characterized in that each of the blades includes a blade body and a blade split, and a blade split is fixed at the blade tip of each blade body located at the blade inlet edge.

[0005] Preferably, each blade body is provided with a groove at the blade tip located at the blade inlet edge, and the blade split body is fixed in the groove.

[0006] Preferably, the shape of the blade body matches the shape of the groove.

[0007] Preferably, the blade body and the blade split are smoothly connected via a plurality of rivets.

[0008] Preferably, the span length of the blade body is 25% of the span length of the blade inlet side.

[0009] Preferably, the chord length of the blade body is 15% of the chord length of the blade tip.

[0010] Preferably, the density of the blade body is greater than the density of the blade body.

[0011] Preferably, the density of the blade segment is more than 1.5 times the density of the blade body.

[0012] Preferably, a side edge of the blade body located at the front end in the rotation direction is the blade inlet edge.

[0013] Preferably, the blade body and the hub are integrally formed.

[0014] The present invention aims at the problem of vibration and induced noise of turbine impeller blades of cantilever structures of the same material, and provides a turbine impeller structure of a cantilever structure. The turbine machine adopting the structure of the present invention has low vibration and low noise performance, and improves the stability of thin blades of the cantilever structure in the flow field when the impeller rotates at high speed around the axis by increasing the density of the blade tip and adjusting the weight distribution of the blade, and can reduce the vibration of the blade under the action of unsteady force and the induced noise. The problem of blade vibration and the induced noise is solved.

[0015] The blade split is made of metal or composite materials with high density and is formed by five-axis CNC machining. After completion, the blade body and the blade split are smoothly connected. This can significantly reduce the vibration of the cantilever structure blade under the action of unsteady forces and the noise induced by it. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of a turbine machine impeller structure;

[0017] Figure 2 for Figure 1 Longitudinal section view of the right side;

[0018] Figure 3 for Figure 2 A local enlarged schematic diagram of the . DETAILED DESCRIPTION

[0019] In order to make the present invention more clearly understood, preferred embodiments are described in detail below with reference to the accompanying drawings.

[0020] The present invention provides a turbine machine impeller structure, such as Figure 1-Figure 3 As shown, it includes a hub 5 and a plurality of blades fixed on the hub 5, each blade includes a blade body 1 and a blade split 3, each blade body 1 is provided with a groove at the blade tip of the blade inlet edge 4, the blade split 3 is fixed in the groove, and the shape of the blade split 3 matches the shape of the groove, that is, the blade at the blade tip of the blade inlet edge 4 (the position of the upper end of the blade farthest from the rotation center) is divided into two parts: the blade body 1 and the blade split 3.

[0021] In this embodiment, the blade body 1 and the hub 5 are integrally formed, and the blade body 1 and the blade split 3 are smoothly connected by a plurality of rivets 2. The span length of the blade split 3 is about 25% of the span length of the blade inlet edge 4, and the chord length of the blade split 3 is about 15% of the chord length of the blade tip. In terms of material density, the density of the blade split 3 is more than 1.5 times that of the blade body 1. The hub 5 is a truncated cone structure, and a cylindrical through hole 6 is provided in the center of the hub 5, which is convenient for the shaft to be installed in the cylindrical through hole.

[0022] Among them, when the blade body 1 rotates, the side edge located at the front end in the rotation direction is the blade inlet edge 4.

Claims

1. A turbine machine impeller structure, comprising a hub (5) and a plurality of blades fixed to the hub (5), characterized in that: Each of the blades comprises a blade body (1) and a blade split body (3); a blade split body (3) is fixed to each blade body (1) at the blade tip located at the blade inlet edge (4); the density of the blade split body (3) is greater than the density of the blade body (1).

2. A turbomachinery impeller structure as claimed in claim 1, characterized in that: Each blade body (1) is provided with a groove at the blade tip located at the blade inlet edge (4), and the blade split body (3) is fixed in the groove.

3. A turbomachinery impeller structure as claimed in claim 2, characterized in that: The shape of the blade body (3) matches the shape of the groove.

4. A turbomachinery impeller structure as claimed in claim 2, characterized in that: The blade body (1) and the blade split body (3) are smoothly connected via a plurality of rivets (2).

5. A turbomachinery impeller structure as claimed in claim 1, characterized in that: The span length of the blade body (3) is 25% of the span length of the blade inlet edge (4).

6. A turbomachinery impeller structure as claimed in claim 1, characterized in that: The chord length of the blade body (3) is 15% of the chord length of the blade tip.

7. A turbomachinery impeller structure as claimed in claim 1, characterized in that: The density of the blade body (3) is more than 1.5 times the density of the blade body (1).

8. A turbomachinery impeller structure as claimed in claim 1, characterized in that: A side edge of the blade body (1) located at the front end in the rotation direction is a blade inlet edge (4).

9. A turbomachinery impeller structure as claimed in claim 1, characterized in that: The blade body (1) and the hub (5) are integrally formed.

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