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  • News >> Single screw pump profile analysis and process method

    Single screw pump profile analysis and process method

    One, the advantage of single screw pump:

    Single screw pump due to the type of line, surface precision is not high, can adopt the chipless machining of high efficient technology, so prices are low, in its structure and adaptability etc also has many advantages, in a lubricating medium, containing solid medium and corrosive medium conveying has become an independent school. At present, the domestic production of single screw pump production enterprises more than double, three screw pump enterprises. Single screw pump single screw pump ( i.e. 1 / 2 type surface ) occupies the overwhelming majority, while international has gradually popularize advanced double helix single screw pump ( i.e. 2 / 3 type surface ). This paper analyses the advantages and disadvantages of them and discusses the technology ways and cross section line ( the derivation from ), is a new line of promotion and application to provide reference.

    In two, the single screw pump several lines of analysis and Discussion on process:

    ( a ), single screw pump several profile analysis:

    1, line type:

    1), conventional line ( 1 / 2 type of plane cross section line as shown in Figure l example, referred to as A, is one of the oldest type line, first proposed by French engineer Myan0. Rotor truncate to rounded. Its diameter is D = 2 A, e t eccentricity, pitch, single head. The stator section is two a radius, center distance of 4E long. Its parameters: the pitch T = 2T, double. The motion of the rotor rotor section is focus to e within a radius of 2 e as the radius of the circle rolling r so-called Cardin asked Zou Connaught circle motion of the planets. Rotor head

    And the stator head number is 12.

    2), the new line ( 2 / 3 type surface )

    Cross section as shown in Figure L ( b ) ( c ) shows, referred to as B type, C type, is at home and abroad in recent years a new type of line.

    B type rotor section shape for a radius of a, the center are 4 e long, and its diameter D = 2 A, eccentric distance E, the pitch T, double. C type rotor section shape is elliptic, whose diameter is D = 2A, eccentric distance E, maximum radius B = a+2e, pitch T, double.

    Stator truncate form as shown in figure I ( d ) shown in shenzhen. Like the aforementioned Cardin, circular motion, rolling radius of 1.5 e, with E as the radius of the circle on a trajectory that bone line (Fig. 2, trigonous hypocycloid K ). Rotor movement, its axis of symmetry 49 segment and bone line conjugate, movement of rotor profile generating line is the stator profile. Although the same path of movement, due to the different rotor truncate, generating stator line difference very big, type B three quatrefoil shape C for triangle. The pitch d = 1.5 T, three head. Rotor head and the stator head number is 23.

    2, profile equation:

    A B type rotor profile equation with the same I C type rotor profile equation for a class of elliptic.

    The new line will provide equations and bone line. Figure 2, spheronization of A1 point, when the centre turned by angle movement to go to the point, the line is a type of bone ( I ). B type stator profile is a with the radius bone line equidistant line ( Lu line ) and with a as the radius of the arc. Each line is a type ( 2). Pure arc section is not in the equation of a circle center of origin for the type ( 3). X0 and Y0 bone line point coordinate. C type stator profile equation and B similar, so slightly.

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