In recent years, the structure of the high viscosity gear pump has been revolutionized. Comprehensive use of materials to forced lubrication of integral sliding bearing as the main characteristics of a number of new technologies, new materials, new technology and the application scope of the gear pump is more and more widely, especially in the polymer melt conveying occasions such as high temperature and high pressure gear pump is almost impossible to replace other volume type pump. High viscosity gear pump has been successfully applied to many industries, such as Vigny fiber, acrylic fiber, polyester chip, viscose fiber and so on.
Now it seems ordinary situations of high viscosity at low temperature and low pressure by using multi tooth difference cycloid gear pump is ideal. The driving gear is in gear claw type circular arc curve, the driven gear embedded in special cycloid tooth profile were 11 teeth and 8, separated by a crescent plate. The pump has a very compact structure, large flow, small noise, high efficiency and can adapt to the change of the viscosity of the medium in a large range.
High precision gear, gear and shaft overall machining and precision grinding and polishing, the whole sliding bearing end tool steel open unloading tank, and will lead to high pressure material bearing with surface lubricating cooling (relatively) after finally returned to the pump suction chamber. The precision, stiffness and volumetric efficiency and the size stability index are very high, suitable temperature has reached 450 degrees, apply pressure has reached 30MPa and the applicable viscosity has reached 4× l06cP.
In addition, the optimal design or development direction of the high viscosity gear pump is as follows:
1) the circular arc gear pump for developing the double arc tooth profile is supplemented by the involute gear pump. The number of gear teeth of double circular tooth less undercut and small abrasion, high efficiency and does not produce the phenomenon of trapped oil.
2) instead of ordinary straight tooth structure, helical teeth and herringbone structure can not only reduce flow and pressure pulsation, but also have a certain self cleaning function. Foreign companies have even used herringbone gears in high-temperature melt pumps.
3) the use of an electric heating jacket with a number of precise sensors instead of a heat medium heat insulation jacket can make the operation of the pump more simplified.
4) the sun — — planetary gear structure is provided with a plurality of import channels in order to achieve the balance of radial force, but also reduce the occurrence of cavitation of the machine. This structure has been used in the small spinning metering pump.
5) the spiral seal (maze), mechanical seal, packing seal and other forms of sealing structure are used to solve the problem of pump leakage (especially in high vacuum).
6) for the special occasions with abrasive grains or strong corrosive media, two external bearing gear pumps with leakage points can be considered. The specially processed gear can replace the cam rotor and the synchronous gear simultaneously.
To sum up the various types of high viscosity pump has its own characteristics and shortcomings, but relatively simple and reliable, with its high efficiency and low energy consumption, wide application and many other advantages in the leading trend in the field of development of high viscosity gear pump and continuous improvement has been more and more obvious.
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