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What is the speed of the KNOLL centrifugal pump?
2023-09-22 17:21:39
Rotational speed (also known as velocity or rotational speed) can be quantified as the number of revolutions of a rotating system in a specified time. The speed unit is S-1 (rev/s). Pump speed is usually given in min-1 (rpm) units.
Therefore, the rotation frequency of the pump shaft represents the pump speed (n). It should not be confused with a specific velocity (n s) and is always defined as a positive number.
The direction of rotation of the pump is specified as either clockwise or counterclockwise and is separate from the defined direction of rotation of the impeller, which is clockwise when turned to the right with respect to the direction of inflow.
The choice of pump speed is closely related to the characteristics of the pump hydraulic system (circular speed, impeller, specific speed), and it is necessary to consider the overall strength and economic efficiency of the pump and drive system.
Most pumps operate at speeds between 1,000 and 3,000 rpm, but often exceed 6,000 rpm when driven with special gears and turbines.
However, larger centrifugal pumps (such as cooling pumps for power stations) are often used in conjunction with slow and very costly power drives. A reduction gear between the drive and the pump maintains today's low pump speed of only 200 rpm.
The speed (n) is proportional to the angular velocity (ω), which is more conducive to physical calculations and is the quotient of the plane Angle with the time interval. The unit is radians per second. The rad (radiant point) is equal to the plane Angle (57.296 degrees) and intersects the center Angle of a circle with a radius of 1 m in an arc of 1 m length.
This is represented in practice by the number 1. The following relationship exists between rotational speed (n) and angular velocity (ω) :
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