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Working principle of single screw: screw has a single head thread, any section is a circle of radius R, the center of the section is located on the helix and deviates from an eccentricity E with the axis of the screw, and rotates around the axis and moves along the axis.

 

Number of heads than Lobes: the number of heads of the stator of the screw T1 is one more than the number of heads of the rotor T2, i.e. T1=T2+1. Their ratio becomes the head to head ratio. The screw pump can be divided into single head (1:2) and multiple head (2:3, 3:4), etc. The more the head ratio, the greater the output torque of the progressing cavity pump, the lower the speed. On the contrary, the smaller the output torque, the higher the speed. The inner surface of the bushing is provided with a double thread whose arbitrary section is a long circle with a semicircle of radius R (equal to the radius of the screw section) at both ends and a straight segment of length 4E in the middle. Any cross section of the bushings is the same long circle, but at a staggered Angle to each other.

 

After the screw is loaded into the bushing, a closed chamber is formed between the screw surface and the inner thread surface of the bushing, and any section is also divided into two crescent shaped workrooms. When the screw rotates, the volume of the first studio near the suction chamber increases gradually, forming negative pressure, and the liquid is sucked into the studio under the action of pressure difference. As the screw continues to rotate, the volume of the working chamber continues to increase to the maximum, the studio is closed, and the liquid is pushed axially toward the pressure out chamber. At the same time, the upper and lower studios alternately absorb and discharge the liquid, so the liquid is continuously pushed from the suction chamber to the pressure chamber along the axial direction.

 

[single screw] is a single screw pump for short, belongs to the rotor positive displacement pump, it depends on the screw and bushing meshing each other in the suction cavity and discharge cavity to produce volume changes to transport liquid. It is a kind of internal meshing closed screw pump, the main working parts by a double head screw cavity bushing (stator) and in the stator cavity with a single head screw screw (rotor). When the input shaft through the universal joint drive making planets revolving around the center of the stator, rotor stator, rotor, vice is continuous mesh form sealed cavity, the seal chamber volume invariably uniform axial movement, the medium from the suction end of deputy to the stator, rotor pressure side, the suction medium sealed cavity through the stator without stirring and destruction.