High-viscosity gear pumps are ideal for conveying high-viscosity liquids and are used in a wide range of applications. At present, although domestic enterprises have produced a number of gear pumps suitable for conveying high-viscosity liquids, due to imperfect testing methods, there are still some problems in material selection, leakage and noise prevention. In particular, domestic high-viscosity gear pumps have a large gap with foreign products in terms of efficiency, reliability and service life. Therefore, most of the high-viscosity gear pumps used in China's petroleum and chemical industries still rely on imports. The high-viscosity gear pump used in high-pressure applications has a tooth width smaller than the tip circle diameter. This is to reduce the radial compression area of ​​the gear and reduce the load on the gear and bearing.
The development characteristics of high-viscosity gear pumps at home and abroad are as follows: the gears of high-viscosity gear pumps are commonly used with straight teeth, helical teeth, herringbone teeth, and helical teeth. The tooth profiles are mainly involute and arc type. Generally, small gear pumps use involute spur gears, high-temperature gear pumps often use displacement gears, and melt pumps that transport high-viscosity, high-pressure polymer melts use involute helical gears. The gear is integrated with the shaft, and its rigidity and reliability are higher than that of the gear pump manufactured separately from the gear and the shaft. The gears of foreign low-pressure gear pumps often adopt a square structure, that is, the tooth width of the gear is equal to the diameter of the tip circle. Http://
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