Turbine case structure to reduce the excitation force of turbine tongue

Abstract

The present invention relates to the technical field of turbochargers, and discloses a turbine box structure for reducing the exciting force of a vortex tongue, comprising a flow channel, an axial hole, a vortex tongue, and a machined contour surface located at the flow channel, wherein the flow channel has an upper cavity surface of a fluid domain and a lower cavity surface of a fluid domain near the axial hole, and one end of a vortex tongue mouth starts from the upper cavity surface of the fluid domain or the lower cavity surface of the fluid domain, and the other end ends at the machined contour surface. The vortex tongue mouth structure is innovatively smoothly transitioned with the upper cavity surface or the lower cavity surface of the fluid domain, and the exciting force generated by the vortex will be greatly reduced when the fluid passes through the tongue mouth, thereby reducing the resonance effect on the turbine blades, thereby improving the high-cycle fatigue strength of the turbine.

Description

Technical Field

[0001] The present invention belongs to the technical field of turbochargers, and in particular, relates to a turbine box structure for reducing the exciting force of a vortex tongue. Background Art

[0002] The exhaust gas turbocharger uses the high-temperature exhaust gas discharged by the engine to drive the turbine in the turbine box to rotate. The turbine shaft drives the impeller in the compressor to rotate at high speed, compressing the air in a centrifugal manner to increase the intake density of the engine, so that more fuel can be sprayed into the engine to achieve the purpose of increasing the engine's own power. At the same time, the engine's mixed combustion regulation is improved, the combustion efficiency is improved, and the effect of saving fuel and reducing emissions is achieved.

[0003] At present, when the high-temperature and high-pressure gas flows through the turbine box during the operation of the exhaust gas turbocharger, due to the sudden change of the flow channel cross-section at the turbine box tongue position (such as Figure 1 As shown in the figure, a vortex will be generated at this position to form a large gas exciting force. When the exciting force is an integer multiple of the natural frequency of the turbine blade, it will cause high-cycle fatigue of the turbine blade and cause the blade to fall off and fail, thus affecting the overall life of the supercharger. Summary of the invention

[0004] The object of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide a turbine case structure which can effectively reduce the exciting force of the turbine tongue.

[0005] The technical solution of the present invention is: a turbine box structure that reduces the exciting force of the vortex tongue, including a flow channel, an axial hole, a vortex tongue and a machined contour surface located at the flow channel, the flow channel has an upper cavity surface of the fluid domain and a lower cavity surface of the fluid domain near the axial hole, one end of the vortex tongue mouth starts from the upper cavity surface of the fluid domain or the lower cavity surface of the fluid domain, and the other end ends at the machined contour surface.

[0006] A further technical solution of the present invention is that one end of the vortex tongue and tongue mouth starts from the upper cavity surface of the fluid domain and the wall surface of the vortex tongue and tongue mouth forms a continuous structure with the upper cavity surface of the fluid domain.

[0007] A further technical solution of the present invention is that the other end of the vortex tongue is transitionally connected in an arc-shaped structure at the machined contour surface, and the arc end of the arc-shaped structure faces the surface of the lower cavity of the fluid domain.

[0008] A further technical solution of the present invention is that one end of the vortex tongue and tongue mouth starts from the surface of the lower cavity of the fluid domain, and the wall surface of the vortex tongue and tongue mouth forms a continuous structure with the surface of the lower cavity of the fluid domain.

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

[0010] The vortex tongue and tongue mouth structure is innovatively smoothly transitioned to the upper or lower cavity surface of the fluid domain. When the fluid passes through the tongue mouth, the exciting force generated by the vortex will be greatly reduced, thereby reducing the resonance effect on the turbine blades and further improving the high-cycle fatigue strength of the turbine.

[0011] The detailed structure of the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a cross-sectional view of a turbine case structure in the prior art;

[0013] Figure 2 A cross-sectional view of a turbine case structure for reducing the excitation force of the turbine tongue according to Embodiment 1;

[0014] Figure 3 This is a cross-sectional view of the turbine box structure for reducing the turbine tongue excitation force described in Example 2. DETAILED DESCRIPTION

[0015] Example 1

[0016] like Figure 2 As shown, a turbine box structure for reducing the exciting force of a vortex tongue is provided, which includes an air inlet 1, an air inlet flange 2, an exhaust gas outlet 3, a flow channel 4, an axial hole 5, a vortex tongue 6 and a machined contour surface 7 located at the flow channel. The flow channel 4 has a fluid domain upper cavity surface 41 and a fluid domain lower cavity surface 42 near the axial hole. In order to avoid the formation of a vortex at the tongue mouth of the vortex tongue 6 when the fluid enters the flow channel 4 from the air inlet 1, one end of the tongue mouth of the vortex tongue of this embodiment starts from the fluid domain upper cavity surface 41 and the other end ends at the machined contour surface 7, that is, the end of the tongue mouth of the vortex tongue forms a connection relationship with the end of the upper cavity surface of the fluid domain, and the air flow channel at this location is no longer in a sudden change state.

[0017] In order to allow the airflow to smoothly enter the upper cavity surface of the fluid domain at the vortex tongue mouth and eventually fill the flow channel, the present embodiment sets the wall surface of the vortex tongue 6 at the tongue mouth to be a continuous structure with the upper cavity surface 41 of the fluid domain. At this time, the airflow flows from the vortex tongue mouth to the upper cavity surface of the fluid domain in a smooth flow state as a whole, achieving an excellent vortex avoidance effect.

[0018] The other end of the tongue of the vortex tongue is transitionally connected to the machined contour surface in the form of an arc-shaped structure 61, and the arc end of the arc-shaped structure faces the surface of the lower cavity of the fluid domain. The arc-shaped structure can make the flow direction of the fluid smoother.

[0019] After comparing the performance of the turbine case structure of this embodiment with that of a conventional turbine case using the CFD method, it was found that by adjusting the vortex tongue and tongue mouth structure, the turbine characteristics of the turbine case structure were not significantly reduced, but the exciting force at the vortex tongue was effectively reduced, which is of great benefit to improving the reliability of the entire turbocharger.

[0020] Example 2

[0021] The difference between this embodiment and embodiment 1 is that: Figure 3 As shown, one end of the vortex tongue 6 starts from the surface 42 of the lower cavity of the fluid domain, and the wall surface of the vortex tongue 6 forms a continuous structure with the surface of the lower cavity of the fluid domain.

[0022] The present invention is not limited to the above-mentioned specific structure or connection method. As long as the turbine box has a turbine tongue and tongue mouth structure that is the same or similar to the design concept of the present invention, it falls within the protection scope of the present invention.

Claims

1. A turbine case structure for reducing the exciting force of a turbine tongue, characterized by: The invention comprises a flow channel (4), an axial hole (5), a vortex tongue (6) and a machined contour surface (7) located at the flow channel, wherein the flow channel (4) has a fluid domain upper cavity surface (41) and a fluid domain lower cavity surface (42) at a position close to the axial hole, and a tongue mouth of the vortex tongue (6) starts at the fluid domain upper cavity surface at one end and ends at the machined contour surface (7) at the other end; One end of the vortex tongue and tongue mouth starts from the upper cavity surface of the fluid domain, and the tongue mouth wall of the vortex tongue (6) and the upper cavity surface (41) of the fluid domain form a continuous structure; the vortex tongue and tongue mouth structure smoothly transitions with the upper cavity surface of the fluid domain; The other end of the tongue mouth of the vortex tongue is transitionally connected to the machined contour surface in an arc-shaped structure (61), and the arc end of the arc-shaped structure faces the surface of the lower cavity of the fluid domain.

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