Analysis of Thermal Characteristics of Multi-channel Melt Gear Pump

When the multi-channel melt gear pump is used to transport high temperature and high pressure media, the thermal characteristics (temperature field, thermal stress and thermal deformation) of the driving gear and the driven wheel are important technical indicators that affect the transmission quality of the gear.

According to the meshing mathematical equation of the involute gear, the finite element 3D model of the driving gear and the driven wheel is established. According to the partial differential equation of heat conduction and the definite solution conditions, it is feasible to establish the steady state temperature field of the driving gear and the driven wheel. According to the finite element temperature field analysis, on the driving wheel and the driven wheel, the temperature of the middle section is higher than the temperature of the upper surface; in the radial direction, the temperature will decrease as the radial distance decreases, and the temperature gradient is also Decrease as the distance decreases. The temperature at both ends of the entire meshing area of the melt gear pump is low, and the temperature gradient in other areas is small.

The thermal stress and thermal deformation analysis results show that the larger thermal stress of the driving wheel of the melt gear pump is located on the tooth root at the meshing position, and the larger thermal stress of the driven wheel is located on the tooth top at the meshing position. These two positions are thermal stress failure. The more dangerous part; the thermal deformation of the driving wheel will be less than the thermal deformation of the driven wheel. The thermal deformation makes the driving teeth expand outward as a concave shape, and the thermal deformation makes the driven wheel expand outward as a trapezoid, which will cause tooth jamming. Makes the multi-channel melt gear pump unable to operate normally. High-temperature medium is the main cause of thermal stress and thermal deformation, but the large thermal stress and thermal deformation positions of the driving wheel and the driven wheel are not similar, indicating that these thermal characteristics are also related to many factors such as structure and material. Zhengzhou Bart’s domestic professional melt gear pump manufacturer provides melt gear pump equipment including: rubber melt gear pump, reactor melt gear pump, extruder melt gear pump, etc., info@battemachinery.com.