Measurement pump manufacturers have different requirements for measurement accuracy for different application scenarios. For example, industries such as pharmaceuticals and chemicals have higher precision requirements and should choose measurement pumps with higher precision levels; In some situations where precision is not required, a relatively low precision but cost-effective metering pump can be chosen. Select the appropriate control method based on the degree of automation and control requirements of the production process. Manual control is suitable for simple and infrequent adjustment situations; Electric control and pneumatic control are suitable for situations that require remote control, automatic adjustment, and linkage with other equipment.

With the continuous development of industrial automation and information technology, metering pumps will become increasingly intelligent. Through built-in sensors, controllers, and communication modules, the metering pump can achieve real-time monitoring and automatic control of parameters such as flow rate, pressure, and temperature. It can interact with the upper computer or production management system to achieve remote monitoring, fault diagnosis, and predictive maintenance functions.

Reasons and solutions for pressure pulsation in metering pumps

The working principle and structural characteristics of the pump

Reason: The working principle of some metering pumps itself can cause pressure pulsation, such as plunger metering pumps, where the reciprocating motion of the plunger is intermittent, and the discharge of liquid is discontinuous during each stroke, resulting in pressure pulsation. In addition, unreasonable structural design of the pump, such as small pump chamber volume and mismatched inlet and outlet pipe diameters, can also exacerbate pressure pulsation.

Solution: For pressure pulsation caused by the working principle, it can be alleviated by optimizing the pump's structural design. For example, increasing the volume of the pump chamber appropriately to provide more sufficient buffer space for the liquid inside the pump chamber; Reasonably match the inlet and outlet pipe diameters, reduce flow resistance, and minimize pressure fluctuations. For plunger metering pumps, dual plunger or multi plunger structures can also be used. By arranging the movement phase of the plungers reasonably, the discharge processes of each plunger can be overlapped and compensated for each other, effectively reducing pressure pulsation.

Performance and working status of valves

Reason: The performance of the suction and discharge valves of the metering pump has a significant impact on pressure pulsation. If the opening and closing of the valve is not timely or complete, or if there is a leakage phenomenon in the valve, it will increase the instability of liquid flow, resulting in pressure pulsation. For example, insufficient elasticity of the valve spring and wear of the valve core can affect the normal operation of the valve.

Solution: Regularly inspect and maintain the valve to ensure that the spring elasticity of the valve is good, and the valve core is not worn or blocked. If the valve is found to be damaged, it should be replaced in a timely manner. At the same time, valves with better performance can be selected, such as ball valves or diaphragm valves with good sealing performance and fast response characteristics, to improve the reliability of valve operation and reduce pressure pulsation.

Stability of the transmission system

Reason: If there are problems such as vibration, excessive clearance, or unstable movement in the transmission system of the metering pump, these unstable factors will be transmitted to the pump head, resulting in unstable movement of the plunger or diaphragm and causing pressure pulsation. For example, the connection between the motor and the pump shaft is not firm, and the wear of the transmission gear can affect the stability of the transmission system.

Solution: Check all components of the transmission system to ensure that the connection between the motor and pump shaft is firm and reliable, the meshing of the transmission gears is good, and there is no obvious wear. If necessary, lubricate and adjust the transmission components, and replace severely worn parts. In addition, shock absorption measures can be taken, such as installing shock pads or shock brackets, to reduce the impact of external vibrations on the pump and improve the stability of the transmission system.

The properties and flow characteristics of liquids

Reason: The viscosity, density, temperature and other properties of the conveyed liquid, as well as the content of bubbles in the liquid, can all affect the pressure pulsation of the metering pump. For example, high viscosity liquids have greater resistance when flowing in pipelines and are prone to pressure fluctuations; When there are bubbles in the liquid, the compression and expansion of the bubbles can lead to unstable pressure.

Solution: Select appropriate metering pumps and pipeline materials based on the properties of the liquid. For high viscosity liquids, the pump speed can be appropriately reduced to reduce flow resistance. Before transporting liquids, try to eliminate any bubbles as much as possible, which can be achieved by installing exhaust devices in pipelines or pre degassing the liquid.

A metering pump is a widely used equipment in the industrial field, used for accurate measurement and transportation of various liquids and gases. It moves fluid from one position to another by rotating or moving components such as plungers and screws, while accurately measuring the fluid. Metering pumps typically use high-precision mechanical or electronic metering systems that can accurately control flow and pressure, making them suitable for various applications that require precise control of liquid or gas flow.

It can accurately control the flow rate of liquid transportation, with a flow accuracy generally ranging from ± 1% to ± 5%, or even higher, meeting various high-precision measurement and batching requirements. The flow rate and pressure can be adjusted within a large range. By adjusting the mechanism or control system, the working parameters of the metering pump can be flexibly adjusted according to different process requirements to adapt to different production needs.