【正文】 ne profile, and unilateral and bilateral type line profile, tooth top center line on both sides of the line are identical, called the symmetric line. On the contrary, the tooth top center line on both sides of the line is not at the same time, called asymmetric line. Only one side has a line in the internal or external rotor pitch circle, called single line. Pitch circle, are stylish lines, called bilateral profile. Generally speaking, the development and design of new line directly affect the performance of screw air pressor, design of screw air pressor performance also depends on the type of line. Screw pressor is constantly engaged on the rotor output pressed gas, therefore the spindle speed variation, volume flow rate, the exhaust pressure of the pressor will be affected, so the spindle speed is a major factor affecting the performance of screw pressor. When the exhaust pressure increases, pressor power consumption also increases, power increases, the decrease of economic benefit, so it has significant effect on energy consumption and exhaust pressure of the pressor. At the same time, some test results show that the external environment temperature will influence the performance of screw pressor. China in different seasons and different regions of the temperature difference, air temperature and ambient temperature of pressor is different, this parameter will directly affect the performance of screw pressor. Therefore, the factors that influence the performance of screw pressor were analyzed, will have the very big help to use screw pressor. Screw pressor body is divided into two kinds, one kind is the belt transmission type, another kind is direct drive. Compressor belt transmission type which is suitable for 22KW power, is posed of 2 manufacturing according to the speed ratio of the belt pulley power via the belt transmission。 2 connected to water。 4 observe the working pressure, slowly clockwise pressure regulating bolt, when the pressure reaches the set value, the safety valve does not open or up to the specified value before the open, it must be adjusted.The adjustment procedure is as follows: 1 remove the cap and seal。s air ventilation, pressure station power supply cable and air switch specifications, water pressure and flow, exhaust pipe sizes have guidance. The instructions also principle and structure of the machine are described in detail, there are certain basic knowledge of mechanical and electrical personnel through carefully reading, can make correct judgement and treatment for mon problems. There is a consumable part of screw pressor to the regular replacement of main lubricating oil, oil filter, air filter, oil filter, notable is replaced in the environment of different parts of the frequency also has the difference, so the screw pressor to daily use and inspection record.Transmission gear and belt drive In the transmission system of the air pressor, generally can be divided into direct transmission and belt drive, longterm since, two kinds of transmission way merits has been one of the focus of the debate. Direct drive screw air pressor refers to the spindle motor through a coupling and a gear to drive the rotor, direct drive which in fact is not the real meaning of. Direct drive on real significance is directly connected to motor and rotor (coaxial) and the speed. This is obviously a little. So that the direct drive no energy consumption point of view is wrong. Another way of drive for belt drive, the drive through the belt wheels of different diameters is allowed to change the rotating speed of the rotor. Belt drive system discussed below is a representative shall meet the following conditions of