Spinning Metering Pump

 

The spinning metering pump is a core precision device in chemical fiber production. Its function is to accurately meter and uniformly deliver polymer melt or solution to the spinneret, ensuring uniform linear density and stable quality of the finished fiber. The following section introduces it from six aspects: working principle, type classification, structural characteristics, performance requirements, application scenarios, and selection points:

 

I. Working Principle The spinning metering pump achieves quantitative fluid control through gear meshing. When the gears rotate, the volume of the meshing chamber changes periodically:

 

Negative pressure zone: A negative pressure is formed at one end of the inlet, drawing in melt or solution and filling the tooth valley;

 

High pressure zone: The continuous rotation of the gears forces the fluid into the discharge chamber, and finally, through gear meshing, forces the fluid out of the pump body.

 

This process, through the periodic meshing of the gears, achieves continuous suction and discharge, ensuring the accuracy and stability of fluid delivery.

 

II. Type Classification

 

By Medium Type

* Melt Spinning Metering Pump: Suitable for high-temperature melts such as polyester, nylon, and polypropylene (operating temperature up to 300℃), 1-16 outlets, heat-resistant alloy steel material must possess high strength and wear resistance;

* Solution Spinning Metering Pump: Suitable for corrosive solutions such as spandex and acrylic, 8-32 outlets, corrosion-resistant alloy steel material must be selected according to the corrosiveness of the solvent.

 

By Structure

* Single Pump: Conventional short fiber production, consisting of a pair of gears, three pump plates, and a drive shaft;

* Stacked Pump: For multi-layer spinning scenarios, such as double pumps (two pairs of gears, five pump plates) or quadruple stacked pumps (six gears, five pump plates), capable of 2-4 outlets;

* Planetary Pump: For filament spinning, consisting of a central driving gear and multiple driven gears distributed around it, up to 8 outlets, ensuring consistent flow rate and pressure at each outlet;

* Composite Pump: For bicomponent fiber production, double-layer structure, two inlets and two outlets connect to the upper and lower layers respectively, achieving synchronous delivery of two fluids.

 

 

III. Structural Features

 

Core Components:

 

Precision Gear Set: The driving and driven gears have the same number of teeth, and their tooth profiles are involute standard gears. Volume change is achieved through gear meshing.

 

Pump Body: Includes an upper cover plate, lower cover plate, and intermediate plate (figure-eight plate), forming an internally enclosed cavity to accommodate fluid.

 

Drive Shaft: Linked to an external pump shaft via a connecting shaft, driving gear rotation.

 

Inlet/Outlet Channels: Aligned with the pump base channels to ensure smooth fluid flow.

 

Material Selection:

The melt pump uses heat-resistant alloy steel (e.g., Rockwell hardness ≥ 60 HRC) to withstand high-temperature environments approaching 300°C.

The solution pump uses corrosion-resistant alloy steel, and key friction pairs undergo surface nitriding treatment to improve wear resistance.

 

IV. Performance Requirements

 

Metering Accuracy: Flow deviation must be controlled within ±0.5% to ensure uniform fiber linear density;

 

Stability: Under high pressure or pressure fluctuations, the supply variation should be minimal and there should be no jamming;

 

Temperature and Pressure Resistance: The melt spinning pump must withstand temperatures approaching 300℃ and high pressure environments without loss of accuracy during residue removal;

 

Wear and Corrosion Resistance: Gear and pump body materials must possess high hardness and corrosion resistance to extend service life;

 

Interchangeability and Sealing: Parts must be standardized for easy assembly and disassembly while ensuring reliable sealing to prevent leakage;

 

Structural Optimization: The shape should facilitate heating and insulation, adapting to different spinning process requirements.

 

V. Application Scenarios

 

Chemical Fiber Production: Spinning conventional fibers such as polyester, polypropylene, spandex, and nylon, using precise metering to control fiber properties;

Nonwoven Fabrics: Such as nonwoven fabric production, using stacked pumps or planetary pumps to achieve multi-layer or filament spinning;

Specialty Fibers: Production of high-performance fibers such as carbon fiber and acetate fiber, requiring higher precision and corrosion resistance from metering pumps;

Low-Viscosity Material Transportation: Some spinning metering pumps (such as MarFin oil pumps) can be extended to metering low-viscosity fluids such as water, organic solvents, and perfumes.

 

If you have specific selection and pricing requirements for precision spinning pumps and metering pumps, please contact CIXIFM Winny:

 

Email: sales01@cxflowmeter.com

WhatsApp: 008618049841995