Due to the simple profile and low precision of profile, the single screw pump can adopt the high efficiency process without chip processing, so the low price has many advantages in terms of structure and adaptability. In non-lubricating media, including solid media and corrosion Sexual media delivery unique. The most widely used single, double and triple screw pump structure, working principle is very different. From an economic point of view, these three types of screw pumps have other pump can not be replaced applications. At present, the application of single screw pump far more than the production of double, triple screw pump, single screw pump in the single head single screw pump account for the vast majority, and the international community has gradually promoted the advanced double-headed single screw pump, screw pump below Linear analysis. Line type 1, the conventional line, referred to as A type, is the oldest type line, first proposed by the French engineer Myan0. Rotor truncation is round. Its diameter D = 2a, eccentricity e, pitch t, ​​single head. The stator truncation is an ellipse with two radii a and centers of 4e. Its parameters: pitch T = 2t, double head. Rotor trajectory is the center of gravity of the rotor cross section e is a radius of 2e radius of the circle rolling r is called the so-called Cardanodon circular motion. Planets. The ratio of rotor head to stator head is 12. 2, the new line cross-section, referred to as B-type, C-type, is proposed in recent years at home and abroad a new type of line. B-type rotor truncated radius a, the center of the circle 4e long circle, the diameter D = 2a, eccentricity e, pitch t, ​​double-headed. C-type rotor truncation is an oval, its diameter D = 2a, eccentricity e, the maximum radius b = a +2 e, pitch t, ​​double-headed. The formation of stator truncation. As described above Cardanoy circular motion, the rolling radius of 1.5e, with e as a radius of the circle on the trajectory that the bone line (triangular prism hypocycle K). When the rotor is moving, the symmetry axis 49 asks the line segment for conjugation with the bone line, and the developing line of the rotor profile during the movement is the stator line. Although the motion trajectories are the same, due to the different rotor truncated, the formation of the stator profile vary greatly, B-type three-petal-shaped C-like triangle. Its pitch Ding = 1.5t, three. The ratio of rotor head to stator head is 23. Line equation AB type rotor line equation Same iC rotor line equation is elliptic. The new line-granting equation is related to the bone line. When the center of rotation by the corner of the movement to go to point, the equation of the bones for the formula. B-type stator profile is the radius of the bone a isometric line (L-line) and a radius of the arc. Lovri equation is type. The pure circular section is a circular equation whose center is not at the origin. X0 and Y0 for the cusp coordinates. C-type stator and B-type line equation similar, so slightly. A type: rotor and stator profile is simple, long production history, processing experience, efficient and economical process. Such as the rotor using continuous stamping process hollow screw factory, not only efficient, provincial material, but also improve pump efficiency and life expectancy. In general, the stator and mold the use of rubber products. However, in the case of high pressure, due to the compression of rubber deformation, the media back to the pump efficiency dropped sharply, and some high-pressure pump efficiency only l. 0% or so. Solve this problem, rigid sleeve is an effective way. Due to the simple type A stator profile, the rigid sleeve is easy to manufacture. Because the relative movement of the rotor and the stator contact surface is not pure rolling, especially the sliding speed of the two straight lines of the stator is relatively large, which is easy to wear.
