I wonder if centrifugal pumps can have their speed adjusted via frequency conversion; what about metering pumps (positive displacement pumps)?
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I wonder if centrifugal pumps can have their speed adjusted via frequency conversion; what about metering pumps (positive displacement pumps)? Don’t they all have electric actuators that allow the stroke to be adjusted via frequency conversion?
Centrifugal pumps can be equipped with variable frequency speed control, and the same is true for metering pumps. I’m not sure where the electric actuator you mentioned is used; variable frequency control only affects the motor, while the pump remains unchanged. With variable frequency speed control, the speed of the motor changes, and accordingly, the speed or reciprocation frequency of the pump also changes
It should be added that when the speed of a centrifugal pump falls below a certain value, its flow rate drops to zero suddenly; this can be seen from the performance curve. Volume pumps, on the other hand, do not experience such a situation – their speed merely decreases, but they still complete their stroke
It can’t be… there’s only adjustment.
Centrifugal pumps can be equipped with variable frequency speed control, and the same is true for metering pumps. I’m not sure where the electric actuator you mentioned is used; variable frequency control affects only the motor, while the pump remains unchanged. When the motor speed changes as a result of variable frequency control, the pump’s speed or reciprocation frequency also changes. However, I should add that when the speed of a centrifugal pump drops below a certain value, its flow rate drops to zero suddenly – this can be seen from the performance curve. Volume pumps do not experience such a situation; their speed simply decreases, but they still complete their cycle
It can adjust its frequency; mine is regulated via frequency change
It can be adjusted via frequency conversion, and frequency conversion is used to regulate the speed of the motor
Theoretically, it’s possible with any of them, but generally, metering pumps are rarely designed with variable frequency speed control – it’s unnecessary. I’ve heard that reciprocating compressors can use variable frequency drives.
The metering pump can be adjusted via frequency variation, and an electric stroke mechanism is used to achieve automatic control and regulation through 4-20mA signal output