The external gear polyurethane booster pump is mainly composed of two meshing external gears, one is the driving gear and the other is the driven gear. When the driving gear is driven to rotate by a motor or other power source, the driven gear will rotate in the opposite direction under its drive. During the rotation of the gears, the meshing teeth gradually disengage, creating a local vacuum on the side of the suction chamber. Under the action of atmospheric pressure, the polyurethane material is sucked into the pump. As the gears continue to rotate, the sucked polyurethane material is carried to the side of the discharge chamber by the teeth. At this time, the teeth gradually mesh, squeezing the polyurethane material, thus increasing the pressure and discharging it from the pump body, achieving the purpose of boosted transportation.
The working volume of the external gear pump consists of the pump body, pump cover, and the tooth space of the gears. When the gears rotate, the volume of the suction chamber continuously increases, creating a negative pressure to suck in the polyurethane material. While the volume of the discharge chamber continuously decreases, compressing and boosting the pressure of the polyurethane material, so that it is discharged from the pump at a higher pressure. Through this periodic change of volume, the transportation and pressure - boosting process of the polyurethane material is completed.
It is mainly composed of basic components such as gears, pump body, pump cover, shaft, and bearings. The structure is relatively simple, the overall layout is compact, it occupies little space, and is convenient for installation and maintenance.
It is usually made of high - strength metal materials such as cast iron and stainless steel. The gears, through special heat - treatment processes, have high hardness and wear resistance. They can withstand the high viscosity and corrosiveness of the polyurethane material, ensuring the long - term stable operation of the pump.
To prevent the leakage of polyurethane material, reliable sealing devices such as mechanical seals and oil seals are used at the parts between the pump body and the pump cover, and between the shaft and the bearings of the external gear polyurethane booster pump. This effectively ensures the sealing performance of the pump and avoids the damage to the environment and equipment caused by material leakage.
It can generate a relatively high pressure, meeting the high - pressure transportation requirements of polyurethane materials in processes such as spraying and pouring, ensuring that the materials can reach the construction parts evenly and accurately.
The meshing movement of the external gears makes the transportation flow rate of the polyurethane material relatively stable with small fluctuations, which is beneficial to ensuring the construction quality of the polyurethane material and the stability of the process.
Polyurethane materials usually have a high viscosity at room temperature. Through reasonable gear design and structural optimization, the external gear polyurethane booster pump can effectively transport high - viscosity polyurethane materials, and is less likely to experience blockage or jamming.
It is used to boost and transport polyurethane foam materials to parts such as the walls and roofs of buildings, achieving the functions of heat insulation and improving the energy - saving effect of buildings.
In the production of automotive components such as seats, instrument panels, and doors, the external gear polyurethane booster pump transports polyurethane elastomers or foam materials into the molds for foaming and molding, manufacturing automotive interior parts with good comfort and safety.
It can be used for the waterproofing, anti - corrosion, and thermal insulation treatment of parts such as the decks and cabins of ships. The polyurethane coatings or sealing materials are boosted and transported to the construction surface to form a solid and durable protective coating.
Regularly inspect all parts of the pump, including gears, bearings, seals, etc., to check for signs of wear, damage, or leakage. Timely detect and replace damaged parts to ensure the normal operation of the pump.
Regularly clean the pump body and filter to prevent the accumulation and solidification of polyurethane materials in the pump, which may affect the performance of the pump. At the same time, keep the suction and discharge pipelines unobstructed.
According to the requirements of the equipment manufacturer, regularly add appropriate lubricating oil or grease to moving parts such as bearings to reduce friction and wear and extend the service life of the parts.
