What is a diffuser casing?
A diffuser is actually a series of vanes surrounding the impeller which accepts the discharge of liquid from the impeller. Diffuser casings are commonly used for vertical turbine and multistage, high-head pumps for maximum pump reliability and where high efficiency is of major importance.
What is Vortex casing?
Vortex casing is a casing in which circular chamber is provided between the casing and the impeller. Vortex casing is helpful to increase pump efficiency by reducing eddies formation to a considerable extent.
What is vaned diffuser?
Diffuser vanes are stationary vanes fitted in the pump casing or diffuser. They convert velocity into pressure energy and guide the fluid handled to the impeller vanes of the subsequent stage. Diffuser element.
Why is a volute chamber and a diffuser provided?
A volute pump casing combines two functions: providing the hydraulic flow path and the pressure casing for the fluid. In diffuser pumps, these functions are split into two separate parts. This provides more guidance for the decelerating flow which can be beneficial from several points of view.
What is the purpose of the pump casing?
Pump casings serve to seal off the intside of the pump to atmosphere to prevent leakage and retain pressure. In the case of centrifugal pumps, they surround the pump rotor which transmits energy to the fluid handled via the impeller(s) mounted on the rotating shaft.
What are types of casing which casing is more efficient?
Single Volute Casing At flow rates near the pump BEP, single volute casings are more efficient than double volute casings. Further, the inherent greater throat areas can also handle larger solids, as found in wastewater.
What is the function of volute casing?
The volute casing is designed to guide the flow out of the impeller in order to convert the fluid flow’s kinetic energy into static pressure; it serves to collect the fluid discharged from the impeller and route it to the discharge nozzle (also see Pump casing).
What is the purpose of a diffuser on a car?
The diffuser acts as an expansion chamber to manage the air as it exits from underneath the car and reintegrates it with higher-pressure ambient air. Smoothing this transition reduces turbulence and drag in the car’s wake and improves airflow under the car.
What is the function of diffuser?
The diffuser is an important element of a compressor or pump. Its purpose is to reduce the velocity of the flow leaving the impeller resulting in an increase in pressure. The diffuser can be simply depicted as a nonrotating channel whose flow area increases in the direction of flow (Figure 7.7).