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Turbocharger bearings are mainly divided into two categories, one is floating bearings (commonly known as Boss bearings), and the other is ball bearings.. Generally speaking, the engine can increase the extra power by at least 30%-40% after cooperating with such a 'forced intake' action. Ball bearings have many advantages: less friction, so there will be better turbine response (reduce turbo lag), and it is more favorable to the ultimate extraction of power; it has more stable dynamic control of the rotation of the turbine shaft (the traditional way is to rely on
The oil is used as the bearing and the stroke floats); the requirements for oil pressure and quality can be relatively reduced, which indirectly increases the service life of the turbine. After all, NA engine air is sucked in by vacuum. Even if the cylinder is full of air, the air pressure in the cylinder is less than or equal to one atmosphere.
The situation is like you take an electric fan and blow it into the cylinder, and you just pour the wind into it to increase the amount of air inside to get a larger horsepower, but this fan does not use an electric motor, but uses exhaust gas from the engine. Some NA engines switch to high-angle camshafts (Hi Cam to increase the overlap angle of the intake and exhaust valves), which can obtain high power at high speeds, but the disadvantage is that the torque at low speeds is poor, and if the angle is too large, There will be an unstable engine idling.
The turboshaft (Bearing) looks like a simple metal tube, but in fact it is a China Clutch Release Bearings precision part that is responsible for 120000-160000rpm rotation and ultra-high temperature. The floating bearing is actually a ring sleeved on the shaft.
Clearance and wearing parts Ensure that the motor bearing clearance is appropriate; appropriately adjust the clearance between the impeller and the volute; regularly check and replace the impeller orifice ring, the pump body orifice ring, the interstage bushing, the diaphragm bushing and other easily wo parts.
These reasons will cause vibration. When the changed stiffness is an integral multiple of the angular frequency of the system, resonance occurs. Use sliding bearings that do not need to be lubricated. Impeller Whether the dynamic and static balance is qualified. At this time, the viscosity of the lubricating oil can be appropriately increased to prevent the damage of the hydrodynamic lubricating film.
Cavitation vibration is a very important part of pump vibration. Factors of the pump itself The asymmetric pressure field generated when the impeller rotates; the vortex of the suction pool and the inlet pipe;China roller bearings manufacturers the occurrence and disappearance of the vortex inside the impeller, the volute and the guide vane; the vibration caused by the vortex caused by the valve half-opening; the limited number of impeller blades
Uneven distribution of outlet pressure; outflow in the impeller; surge; pulsating pressure in the flow channel; cavitation; water flowing in the pump body will have friction and impact on the pump body, such as water flow hitting the front of the diaphragm and guide vane Boiler feedwater pumps that transport high-temperature water are prone to cavitation vibration; pressure pulsation in the pump body is mainly caused by the seal ring of the pump impeller.
Finally, in order to prevent the pump's amplitude from being too large, measurement and analysis of vibration conditions can also be used to determine the best working parameters of the pump.
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