1.Flow and speed are in direct proportion, automatic flow adjustment can be achieved by speed controller.
2.Various shaft sealing options can be realized due to composite design of sealing chamber
3.Opposite direction transfer in short term can be realized due to composite design of the flange and bearing.
4.Various stator and rotor material pairing for various working conditions.
5.Stable flow and pressure, no pulsation, low noise and strong self-priming ability.
6.Wide application scope for various fluid medium, including high viscosity, solid content, fiber, suspended impurities.
7.Use oil instead of traditional grease for bearing to enable more sufficient and effective bearing lubrication
Indications for type selection:
1.The more abrasive the medium is,the higher pump speed is,the more easily the rotor and stator and stator will be damaged.Therefore,the medium abrasive property must be taken into consideration when selecting pump speed.The more abrasive is,the lower the vgm value should be as following;
2.P.C pump is able to handle medium with some solid particles and fiber which must meeting following table requirement and the pump speed must be reduced if the solid particle diameter and content increases.
Performance:Flow 180 m3/h
Maximum Pressure:2.4 Mpa
Maximum Temperature:220 ℃
Screw pump is a good means to exploit heavy oil and sandy crude oil. Its volume efficiency increases with the increase of crude oil viscosity, unlike centrifugal pump, its pump efficiency decreases sharply with the increase of crude oil viscosity. The screw pump, invented in 1930, is mainly used to pump viscous liquids in the industrial field. It has been used as an artificial lifting method to extract heavy oil and sandy crude oil in the past 20 years. It is a volumetric pump, characterized by simple structure, small size, light weight, no pump card, gas lock, blocked by sand and wax scale, and no emulsification.
The downhole system generally consists of stator, rotor, rotary cylinder, limiter, sucker rod, sucker rod centralizer, stator centralizer, tail pipe, packer and anchoring device.
Sucker rod centralizer
The sucker rod centralizer consists of a mandrel and a centralizer barrel, which is connected between two sucker rods and is stuck between two sucker rod coupling. The mandrel is a very short rod joint. The centrifugal cylinder is a hollow plastic cylinder with an inner hole about 1MM larger than the mandrel. There are four centrifugal wings outside which are slightly smaller than the inner diameter of the tubing. The centralizer can rotate around the mandrel to prevent the sucker rod from contacting the inner wall and abrasion the tubing, and allow the fluid to pass through.