Flow metering pump | How to adjust the flow rate of the metering pump? Manual adjustment of the flow rate of the metering pump

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The core methods for regulating the flow rate of a metering pump include stroke adjustment, speed adjustment, and bypass adjustment. The specific selection needs to be flexibly adapted according to actual working conditions and needs.

First, stroke adjustment adjusts the amount of liquid delivered in a single operation by changing the stroke length of the plunger or diaphragm. The larger the itinerary, the greater the flow, and vice versa. • Operation implementation: Supports manual knob/handle adjustment to directly change the stroke, and some devices can be configured with electric or pneumatic devices for remote control through current and air pressure signals. Secondly, speed regulation is based on the proportional relationship between flow rate and speed, by adjusting the pump shaft speed to change the delivery volume per unit time. • Technical path: commonly used frequency converters drive motors to achieve continuous smooth adjustment with high precision infiltration; If the flow adjustment range is fixed, pulley/gear with different transmission ratio can be replaced, but the adjustment flexibility is low.

3. Bypass regulation: A bypass return channel is set up at the pump outlet, and the valve opening is used to control the return ratio.

. • Adjustment feature: The larger the valve opening, the smaller the flow entering the system. This method is simple and easy to implement, but with an increase in energy consumption, it is suitable for temporary flow fine-tuning scenarios. According to the systems requirements for adjustment accuracy, energy consumption, and cost, it is recommended to prioritize using stroke adjustment or speed adjustment. When rapid emergency adjustment is needed, auxiliary solutions such as bypass adjustment can be considered.

2. How to adjust the flow rate of the metering pump?

The metering pump, as a volumetric pump for accurately and quantitatively transporting liquids, has a wide range of applications in industrial production and research.

I. Flow regulation mode of metering pump There are many common flow regulation methods of metering pump, among which the stroke regulation mode is widely used. There are three main ways to adjust the stroke:

1. Manual adjustment during parking: When the metering pump stops running, the stroke is increased by manual operation.

2、 Manual adjustment during operation: By adjusting the axial displacement and changing the crankshaft radius during pump operation, the stroke length can be adjusted.

3、 Automatic adjustment during operation: usually using two methods: pneumatic control and electric control. Pneumatic control achieves automatic adjustment by changing the pressure signal of the gas source; Electric control, on the other hand, achieves automatic adjustment by changing the electrical signal.

Secondly, the habit of manually adjusting the flow rate of the metering pump is to manually adjust the fine adjustment screw of the pump to change the effective stroke of the plunger (or dia

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