The working principle of single screw pump, characteristics and selection methods

Working principle of pump

single screw pump is a kind of internal meshing and eccentric rotary positive displacement pump. The main parts of the pump are: single-head screw rotor and double helix stator is usually made of elastic materials. When the rotor around the cavity planet rotates, the axis of the stator in rotary closure wrist will be formed between the stator along the rotor helical motion. Therefore, the medium inlet continuous, uniform and constant pressure to export. Based on this feature, especially suitable for the following a single screw vacuum pump working conditions.

medium with high viscosity, viscosity between 37000 and 200000 centipoise medium according to the size of the pump.

medium containing particles or fibers: particle diameter can be a 30 mm ( No more than the rotor eccentricity) 。 Fiber length can be 350 mm ( Equal to zero. Four spacing) 。 Its content is generally can reach 40% of the cellar. If the solid medium is in the form of fine powder, the highest content can reach 60% or more, and can transport. When the transmission medium pressure stable and the inherent structure was not damaged, single screw pump is the most ideal.

the characteristics of the pump

single screw vacuum pump because of its structure and working characteristic, and the piston pump, centrifugal pump, vane pump compared to gear pump has the following advantages:

can transport high solid content of the medium;

flow uniform pressure stability, especially in low speed;

flow rate is proportional to the pump speed, so it has a good variable adjustable;

a pump can transport medium of different viscosity.

the installation position of the pump can tilt;

is suitable for the transmission of sensitive items such as the damaged items and the centrifugal force.

small volume, light weight, low noise, simple structure and convenient maintenance.

the use of pumps

single screw pump for the transmission of a variety of media can be widely used in the industrial sector.

chemical industry: acid, alkali, salt solution, screw vacuum pump outlet pressure of viscous, paste emulsion chemical grout.

in exploration and production: all kinds of drilling mud, drilling water, bleeding, and fluid.

shipbuilding: bilge, dirty oil, all kinds of oil and water.

ceramic industry: clay, clay, glaze.

energy industry: all kinds of fuel oil, kerosene, coal-water slurry, coal slurry and nuclear waste.

sewage treatment, sewage, oil and dirt.

the papermaking industry: all kinds of cellulose pulp, coating, black liquor.

the pharmaceutical, food and cosmetics industry: all kinds of grains and berry syrup, starch paste, tomato paste, paste, mother liquor, wine and vinasse, etc.

other agricultural, forestry, animal husbandry and fishery: they are widely used.

the choice of water pump

the specifications of the pump is selected based on the property for conveying liquid and to determine the flow pressure and rotational speed of pump for conveying liquid viscosity and corrosive as the main parameter to select, in order to ensure the reliable operation of the water pump. Here recommend ( Figure 2) For your reference.

the design of the pump speed is no corrosive liquid conveying water or similar water when the maximum allowable speed. In actual use, due to the different dielectric properties and service life requirements, choose the general speed should be lower than design. For high viscosity and medium containing particles, 1/2 - usually adopt The design of a third or less speed. Low speed is beneficial to the wear of the pump. However, due to the use after the stator patent reexamination 3) Reduce the abrasion and increasing speed to compensate for reduced flow is usually strategy. The temperature of the medium should be - Between 10 to 80, under the special circumstances of up to 120.

each level of the pump ( The stator of a lead) The normal pressure of 0. 6 mpa, allowed in a short period of time ( No more than 30 minutes) Up to 0. 8Mpa。 When the water pump wear, under the same output pressure, volume efficiency will be gradually reduced.

when pumping water, the biggest intake stroke is 8 m, actual use no more than 6. 5m。 Pumping high viscosity medium, should adopt positive pressure breathing.

single screw vacuum pump selection points

1. The determination of single screw vacuum pump pressure: maximum output power pr

2. Single screw vacuum pump speed choice: due to its structure characteristics, single screw vacuum pump outlet pressure is mainly used for conveying high viscosity of the liquid and liquid containing particles, and therefore the choice of speed is critical.

3。 22 kw single screw vacuum pump bushing rubber material choice: single screw vacuum pump bushing is rubber products, is also the single screw vacuum pump parts. Its selection directly influence the service life of bushing. Usually, the service life of bushing for 3 - For six months. If choose undeserved, casing may fall off from the steel pipe, or rubber may fall off.

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