Reactor Melt Gear Pumps
Reactor melt gear pumps are precision devices specifically designed for the transportation of high-viscosity melts, widely used in industries such as chemicals, plastics, rubber, and synthetic fibers. Their core function is to achieve stable pressurization and precise metering of melts through the volumetric changes generated by gear meshing. Compared to ordinary gear pumps, its design must accommodate extreme operating conditions such as high temperatures (typically above 300°C), high pressures (up to 30 MPa), and high viscosities (exceeding 10⁵ cP). Therefore, special alloy steels (such as tool steel and stainless steel) and special heat treatment processes are employed to ensure wear resistance and corrosion resistance.
Structure and Working Principle
The pump primarily consists of an active gear, a driven gear, a pump body, a bearing system, and a heating jacket.
Gear Design: Involute or arc-shaped teeth are used, precision-ground to minimize pulsation; gear clearance must be strictly controlled within 0.05–0.1 mm to balance sealing performance and melt flowability.
Drive System: Equipped with a variable-frequency motor or hydraulic motor to achieve stepless flow regulation (accuracy ±1%).
Temperature Control Mechanism: Features built-in electric heating rods or a thermal oil circulation system to maintain uniform melt temperature (fluctuation ±2°C).
Key Performance Parameters
Flow Rate Range: 0.1 to 200 m³/h, adjustable via gear module and rotational speed.
Pressure Rating: Available in three grades: 10 MPa, 20 MPa, and 30 MPa, matching the reactor outlet pressure.
Efficiency metrics: volumetric efficiency >90%, mechanical efficiency >85%, energy consumption 15%–20% lower than traditional screw pumps.
Industry application scenarios
Polymer production: used for spinning pressure boosting of PET, PA6, and other melts, eliminating the impact of reactor pressure fluctuations on fiber quality.
Rubber Processing: Achieves constant-pressure extrusion of rubber compounds in the rear section of a mixer, preventing bubble formation.
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