Turbo-turbine shafts and turbine impellers for turbocharger

- Nov 01, 2017 -

Turbine Shaft

The turbine shaft (bearing) appears to be simply a metal tube, but in fact it is a precise part with 120000-160000rpm rotation and ultra-high temperatures. It is the most core technology of all turbine factories because of its fine processing work, profound material application and treatment. The traditional turbine shaft uses a wave-bearing (bushing bearing) structure. It is really just a metal tube, it relies entirely on high-pressure into the bearing chamber of oil to achieve the supporting heat dissipation, so as to high-speed rotation.

The recent emergence of ball bearing (Ball bearing) has gradually become the trend of turbine axis development. As the name suggests, ball bearings are installed on the turbine shaft ball, replace the oil to become bearings. Ball bearing has many advantages: less friction, thus there will be better turbine responses (which can reduce the lag of the turbine) and be more advantageous to the ultimate squeezing of the power; it is more stable to the dynamic control of the turbine shaft rotation (the traditional bearings are made by oil, the travel is floating), and the requirements for oil pressure and quality can be reduced, The service life of the turbine is increased indirectly. But its disadvantage is not as durable as the traditional Wave secretary bearings, about 70,000-80,000 km to the life limit, and difficult to repair, maintenance costs are expensive. Therefore, the turbine manufacturing plant that attaches importance to durability (such as KKK) will not launch this type of turbine.

Turbine impeller

Turbine impeller blade Type, can be divided into "water wheel" blade (Shape is straight piece design, let exhaust gas collisions and create a roundabout force, directly with the rotation of the movement, and the "Windmill" blade (the shape of the curved blade design, in addition to the use of the force of the collision, but also can effectively use the airflow into the blade and blade, To obtain the exhaust gas expansion energy). Turbine impeller diameter and the number of blades will affect the horsepower linearity, theoretically speaking, the smaller the number of blades, low-speed response is poor, but the high speed of the explosive force and the persistence is not more than the blade can be compared.

The blades of the turbine impeller are mostly made of high heat resistant steel (some use ceramic technology), but because of the large quality of the iron itself, the light and strong titanium alloy blades are produced.

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