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Understanding the functional characteristics of each component of the flattening flow pump is essential for better use
Date: 2025-10-16Read: 4
The medium pressure advection pump is the core power device in applications such as liquid chromatography, solvent transportation, chemical reaction feeding, and precision cleaning. It can provide continuous, stable, and low pulsation liquid flow within the pressure range of 0.1-40MPa. Its advection characteristics ensure high repeatability of analysis results and smooth system operation. The excellent performance of the medium pressure advection pump is the result of the collaborative operation of multiple precision components, which jointly build an efficient and reliable power system.
1. Dual plunger drive mechanism
Adopting a dual plunger series or parallel design, driven by a crankshaft or cam, to achieve alternating suction and discharge. When one plunger is pressurized and outputs, the other plunger synchronously absorbs liquid, effectively canceling out the pulsation of the single plunger pump and outputting a nearly constant smooth flow. The plunger material is mostly high hardness stainless steel or ceramic, with a surface that has undergone ultra precision grinding, wear-resistant and corrosion-resistant, ensuring long-term sealing.
2. Unidirectional valve group
Each inlet and outlet is equipped with a pair of high response one-way valves (also known as check valves), consisting of a valve body, a valve ball (or disc), and a spring. The inlet valve opens when the plunger is pulled back, allowing liquid to be drawn in; The outlet valve opens when the plunger is pushed forward, achieving high-pressure output. The valve body is made of sapphire, ruby or polymer materials, with good sealing and resistance to particle impact, ensuring precise flow without backflow.
3. Pump head chamber
Made of high-strength stainless steel, the internal flow channel is precision polished to reduce dead volume and turbulence. Adopting modular design, easy to disassemble and maintain. The pump head sealing ring (such as PEEK, Viton material) is resistant to high pressure and solvents, ensuring long-term operation without leakage.
4. Solvent degassing device
Integrated online degassing unit (such as vacuum degassing membrane) removes dissolved air and bubbles before the liquid enters the pump head. Bubbles can cause flow fluctuations, unstable pressure, and even "gas lock" phenomena. The degassing device ensures the purity of the conveyed liquid and improves system stability.
5. Pressure sensors and feedback systems
Built in high-precision pressure sensor for real-time monitoring of outlet pressure. The signal is fed back to the control system to achieve protection functions such as overpressure alarm and automatic pump stop. Some models support pressure closed-loop control, dynamically adjusting pump speed to maintain constant pressure output.
6. Drive motor and transmission mechanism
Using stepper motors or servo motors, combined with precision gears or cam mechanisms, to achieve precise control of speed and plunger stroke. The motor has a wide speed range and high torque output, ensuring stable operation under different viscosities and pressures.
7. Control system and display panel
Integrated microprocessor and LCD display screen, users can set parameters such as flow rate, upper pressure limit, and running time. Support gradient elution, multi-stage program operation, and have fault self diagnosis, data storage, and communication interface functions.