适用范围：流量:0.03~ 450m3/h;排出压力:< 20MPa;操作温度:- 20~150C ;介质黏度:≤10°mPa . S;固体含量:40% ~70%(颗粒的体积含量);颗粒尺寸小于e(e为螺杆截面圆心与轴线的偏心距);纤维长度小于0. 4t(t为螺杆的螺距)
适用范围：流量:0.3~ 2000m3 /h;排出压力:≤4MPa,非对称曲线齿形可达8MPa;工作温度:≤250°C ;介质黏度:1~1500mm2/s,降低转速后可达100000mm2 /s
特点：(1)结构简单，无需齿轮传动；(2)螺杆不承受弯曲载荷,可制得很长，最因此可获得高压力; (3)不宜输 送含600pum 以上固体杂质的液体; (4)可高速运转，是一种体积小的大流量泵，容积效率高; (5)填料箱仅与吸入压力相通，泄漏量少; (6)可气液两相混输
适用范围：流量:0. 25 ~ 1000m2/h，最大可达2000m3 /h;排出压力:一般≤25 MPa. 最大达70MPa; 操作温度:≤280°C;介质黏度:5~ 500mm2/s,降低转速后可达2400mm2/s; 允许最大颗粒:600um以下
目前Bornemann公司和Lestritz 公司生产的陆上用双螺杆式多相泵已有系列产品。如Lestritz公司的L4MK、L4HK 系列产品，Bornemann公司生产的MW、MHP、MPC各类多相泵,已有几十台双螺杆式多相泵运行在美国、加拿大、德国、中国委内瑞拉巴西等国家的陆上和海上油田，并取得了良好的效果。
Single screw multiphase pump
The single screw multiphase pump is composed of elastic stator and metal rotor (Fig. 2-4). It is generally used in the artificial lift system in the wellbore. It can also be used in the inlet or surface multiphase pressurization system. It is usually used for small flow (the total flow of oil, gas and water is more than 19.875m3 / h)
When the pressure is low (the maximum pressure is 2.76mpa). It can be used in the case of high solid content in the medium, but the stator must be replaced regularly.
2. Twin screw multiphase pump
At present, the design idea of the twin-screw multiphase pump, which is widely used in the field, is developed on the basis of the common twin-screw liquid pump for the exploitation and transportation of high viscosity crude oil, and after absorbing the key technologies such as the screw line design and rotor processing of the oil injected twin-screw gas compressor (essentially the oil-gas mixed pump with the gas content of 97% - 99%), also known as the high-pressure twin-screw pump, as shown in Figure 2-5.
Single screw pump
Structure: the single head male screw rotor rotates eccentrically in the special double head female screw stator (the stator is flexible), and can swing back and forth along the center line of the pump, and always keep meshing with the stator
Features: (1) it can transport liquid containing solid particles; (2) it can be used for almost any viscosity fluid, especially for high viscosity and non Newtonian fluid; (3) the working temperature is limited by stator material
Scope of application: flow rate: 0.03 ~ 450m3 / h; discharge pressure: < 20MPa; operating temperature: - 20 ~ 150C; medium viscosity: ≤ 10 ° MPa. S; solid content: 40% ~ 70% (volume content of particles); particle size less than e (E is the eccentricity between the center of screw section and axis); fiber length less than 0.4t (t is the screw pitch)
Application: widely used in chemical industry, petroleum, sewage treatment, daily chemical industry, construction, papermaking, textile and food, etc
Double screw pump
Structure: there are two screw shafts of the same size, one is the driving shaft and the other is the driven shaft, which achieve synchronous rotation through gear transmission
Features: (1) small fluctuation of flow and pressure, flow can be adjusted by rotating speed; (2) screw and pump body and screw keep 0.05 ~ 0.15mm gap; (3) it can transport liquid and corrosive medium containing micro particles, with low noise and long service life; (4) stuffing box is only affected by suction pressure, with less leakage; (5) The discharge pressure of the pump depends on the pressure of the output pipeline system, and the possible discharge pressure depends on the number of screw pitch; (6) it has self-priming capacity, so it does not need to fill the pump before starting; (7) it is suitable for conveying liquid with certain viscosity, and can be mixed with gas and liquid
The results show that the working pressure is less than or equal to 100000m3 / mm2, the discharge pressure is less than or equal to 100000m3 / mm2, the discharge pressure is less than or equal to 1.0m3/mm2, the discharge speed is less than or equal to 100000m3 / mm2, the discharge pressure is less than or equal to 1.0m3/mm2 and the discharge speed is less than or equal to 1.0m3/mm2
Application: for lubricating oil, grease, crude oil, fuel oil and other high viscosity oil
Three screw pump
Structure: it is composed of a driving screw and two driven screws meshed with it
Features: (1) simple structure, without gear transmission; (2) the screw does not bear bending load, can be made very long, so it can obtain high pressure; (3) it is not suitable to transport liquid containing more than 600 pum solid impurities; (4) it can operate at high speed, it is a small large flow pump with high volumetric efficiency; (5) the stuffing box is only connected with the suction pressure, with less leakage; (6) it can be gas-liquid two-phase mixed transportation
Scope of application: flow rate: 0.25 ~ 1000m2 / h, up to 2000m3 / h; discharge pressure: generally ≤ 25MPa, up to 70MPa; operating temperature: ≤ 280 ° C; medium viscosity: 5 ~ 500mm2 / s, up to 2400mm2 / s after speed reduction; maximum allowable particle size: below 600um
Application: used for conveying lubricating oil, hydraulic oil, heavy oil, fuel oil, diesel oil, gasoline, liquid wax and synthetic resin with low viscosity. It can also be used for lubricating oil pump and sealing oil pump of centrifugal compressor, large pump, etc
The rotor pair of twin-screw multiphase pump is composed of two non-contact screws, which transmit torque through hardened spur gear. In the design of the pump, the compressibility of the gas is used to reduce the backflow loss, improve the volumetric efficiency of the pump, and minimize the adverse factors such as axial thrust, noise, pressure pulsation and pump vibration. Therefore, the pump has good efficiency and operation characteristics.
At present, bornemann company and leslitz company have produced a series of land-based twin-screw multiphase pumps. For example, the l4mk and l4hk series products of leslitz company, the MW, MHP and MPC multiphase pumps produced by bornemann company, and dozens of twin-screw multiphase pumps have been operated in the onshore and offshore oil fields of the United States, Canada, Germany, China, Venezuela and Brazil, and good results have been achieved.
The main features of the twin-screw multiphase pump are as follows:
(1) When the gas content of conveying medium is very high, it can still achieve higher volumetric efficiency and better pressurization;
(2) The driving shaft drives the driven shaft by the gear instead of the screw, so the screw can maintain a certain gap, reduce the wear to a certain extent and allow fine sand particles to pass through. At the same time, the fluid flows into the pump body from the pump side and flows out from the upper part, so that there is a certain amount of liquid in the pump, which has a short time (about 30 minutes) anti dry running ability
(3) It is generally suitable for medium and small flow (10 ~ 500m3 / h) and medium and high pressure (0 ~ 10MPa) occasions
(4) It is especially suitable for Multiphase Transportation in the presence of viscosity change, corrosion and other additional loads;
(5) It is sensitive to solid particles, and its overall weight and volume are relatively large;
(6) The special cutting edge shape is needed for the machining of the rotor of the twin-screw multiphase pump;
(7) When the outlet temperature is higher than 95 ° C, an independent cooling system should be considered.