XBZ helical gear pump device used in metallurgy, mining, forging, power stations, chemical industry, cement and other heavy machinery circulating lubrication system in thin oil, can also be used to transport all kinds of lubricants, oil, heavy oil, and other non-corrosive liquids. Transport of fluid viscosity in the range of 20~320 per annum pool, oil temperature not exceeding 60 degrees Celsius.