The design of oil pump is to select and determine the structural parameters of oil pump reasonably according to the situation of oil well and lifting requirements. Such as rotor diameter, motion eccentricity, stator lead, pump series and stator interference basin and the number of working (rotor working revolution). Practice shows that the structural parameters and working parameters of screw pump not only determine the working characteristics of oil pump. And directly affect the screw
Reliability of pumps and their production systems. Especially for the oil Wells with large difference between industrial and mining environment and crude oil physical properties, the shape response law and influence degree of the structure parameters and working parameters are different. The design of the screw pump is the key to make it have better comprehensive characteristics.
In addition, the design of different number of oil pumps is also a trend. American PumpService inc. has developed a 4+5 screw liner submersible pump. Compared with single-head oil pump, multi-head oil pump greatly reduces the geometric size of the pump, and improves the displacement and pressure head of the pump. Reduced pump speed. Reduce the vibration of the pump. Under the same condition that the pump depth is 610m and the displacement is 318m'/H, the outer diameter of the single-head oil pump is 114.3mm. The length is 8.53m. The outer diameter of 4 and 5 multi oil pumps is only 88.9mm wide and the length is only 3.35m. Domestic liaoning futai machinery manufacturing co., ltd. has produced screw lining for 2,3 for ground control screw pump, creating a good precedent. The manufacturing quality of the pump is reflected in the bonding of the stator bushing, the ink-melt of the stator image glue, the surface quality of the stator and the rotor, the dimension accuracy of the structure and the profile tip. Due to machining quality and existing problems, pump body degumming, fixed rotor locking, stator rubber rupture, rotor surface peeling, etc., lead to the failure of oil well lifting accidents occur from time to time. In addition, the precision of lifting line determines the meshing characteristics of the rotor. Is the key factor affecting the life of oil pump. Therefore, the manufacturing level, especially the technological stability of stator manufacturing and the geometric dimension accuracy of fixed rotor processing are the appropriate factors to determine the quality of oil pump products.
Improving the manufacturing quality of the oil pump is also reflected in the surface treatment process of the rotor. Because the crude oil contains acid (or alkali) gas, contains a certain proportion of sand, so that the oil pump rotor is in corrosion and abrasion environment, in this condition, the surface of the rotor flipping treatment than the surface of chromium plating rotor life is much longer. Solid face indicates. Only under corrosive conditions. The rotor life of surface flipping treatment is s times longer than that of surface chrome-plated rotor, and the rotor with tungsten nitride coating has better performance than traditional chrome-plated rotor. It is a pity that the domestic rotor is more commonly used.
The pre-forming process of oil pump rotor can also be divided into two categories :(1) "rotary hot rolling forming rotor. The rotor of oil pump is generally processed by a round blank. This manufacturing method not only takes longer processing time, but also wastes materials, costs more and forms an unsatisfactory forging streamline, so the use effect is not very good. If the rotor is formed by hot rolling of round steel, not only the working time can be saved, but also the metal material can be saved and the cost can be reduced. It also works better. Therefore, in recent years, the hot rolling rotors of round steel are used more abroad.
(2) pipe hot rolling forming rotor. The rotor formed by hot rolling steel tube has the advantages of hot rolling round steel rotor. It also saves more metal. The weight of the rotor is relatively light.
