NYP high viscosity pump gears are common spur, helical, herringbone, helical teeth, tooth profile are mainly involute and arc type. Usually small gear pump to use more involute spur gear, high temperature gear pump often use variable gear, conveying high viscosity, high pressure melt polymer melt more use of involute helical gears. Gear and shaft made of one, its rigidity and reliability is higher than gear and shaft separately manufactured gear pump. Foreign low-pressure gear pump gear is often used square structure, that gear tooth width equal to the addendum circle diameter. The high-pressure occasions used in high-viscosity gear pump gear tooth width less than its tip diameter, which is to reduce the gear radial compression area, reduce gear, bearing load. Due to the high viscosity of the medium delivered by the high viscosity gear pump (NYP High Viscosity Pump), the medium must be heated or insulated in order to reduce the flow resistance and increase the suction capacity of the pump. Heating elements are usually used to make viscous liquid heat evenly. If the temperature fluctuations, the delivery of high-viscosity liquid prone to degradation, it is recommended to use fluid heating, especially large displacement gear pump. Fluid heating is divided into built-in, external structure. The so-called built-in gear pump pump body or cover the internal design of the sudden heat jacket, the external is through the screw clamp jacket and pump body together. Into the jacket into the steam, HTF, or cooling water, according to the specific circumstances of the media. Built-in for the delivery of liquid temperature uniformity is higher, or require uniform cooling of high temperature liquid occasions. When the lack of electrical heating or security requirements of the temperature control is not high, the external structure can be used. American VIKING company's internal gear pump, pump head part of the jacket can be transported fluid temperature control, either in high temperature or low temperature environment, can be equipped with an external jacket. As the shaft rotates, the low temperature liquid outside the bearing is drawn into the bearing by means of the helical action and the pressure difference between the two ends of the bearing. After the bearing is lubricated and cooled, it flows into the tooth just disengaged to form a fully lubricated and heat-dissipating screw Self-priming low-pressure lubrication system. The advantages of the lubrication method are as follows: all the lubricating liquid entering the bearing is a low-temperature medium, and the viscous lubricating liquid tends to form a dynamic pressure oil film with a strong carrying capacity.
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