Single-screw pump Single-screw pump is a kind of eccentric rotary internal volume of the positive displacement pump, the pump's main components: a single-helix rotor and a usually made of flexible material with double-helical stator, when the rotor is set in the cavity As the planet rotates around the axis of the stator, the airtight wrist formed between the rotors is displaced along the helix of the rotor; therefore, the medium is continuously, uniformly and volumetrically delivered from the suction port to the extrusion end, Based on this feature, single-screw pump is particularly suitable for the following conditions of work. Pump works Single screw pump is a positive displacement pump, which relies on screw and bushing intermeshing in the suction chamber and discharge chamber to produce volume changes to transport liquid. It is an internal mesh enclosed screw pump. The main working part consists of a bushing (stator) with a double-headed helical cavity and a single-headed helical screw (rotor) engaged with it in the stator cavity. When the input shaft drives the rotor through the universal joint to revolve around the center of the stator, the stator-rotor pair continuously mesh with each other to form a sealed chamber. The volume of the sealed chamber is uniformly and axially moved at constant speed, and the medium is transported from the suction end through the stator - The rotor is fed to the press-out end and the medium drawn into the closed chamber flows through the stator without being agitated and destroyed. Screw has a single thread, any section of which are R radius of the circle, the center of the cross section is located on the helix and the axis of the screw deviation from an eccentricity e, around the axis of rotation and the axial movement of the liner The inner surface has a double thread, an arbitrary section of which is an ellipse, the two ends are semicircles with a radius R (equal to the radius of the screw section), and the middle section is a straight section with a length of 4e. Any section of the bushing is the same oval, just offset from each other by an angle. After the screw is inserted into the bushing, the closed cavity is formed between the screw surface and the internal thread surface of the bushing, and the arbitrary cross section is also divided into two upper and lower crescent-shaped working chambers (as shown in FIG. 1-3). As the screw rotates, the volume of the first working chamber near the suction chamber gradually increases to create a negative pressure, and the liquid is drawn into the working chamber by the pressure difference. As the screw continues to rotate, the working chamber volume increases to the maximum, the working chamber is closed, and the liquid is pushed axially toward the pressure chamber. At the same time, the upper and lower chambers alternately suck and discharge the liquid cyclically, so that the liquid is continuously and axially pushed from the suction chamber toward the pressure chamber. Suitable conditions for the delivery of high viscosity medium: Depending on the size of the pump can deliver viscosities from 0-200000 centipoise medium. Medium containing particles or fibers: The particle diameter can be 30mm (not to exceed rotor eccentricity). The fiber length can be 350mm (equivalent to the pitch of 0.4 rotor). Its content is generally up to 40% of the media pit, the medium if the solid matter is a fine powder, the maximum content of up to 60% or more can also be transported. Requires delivery pressure is stable, the inherent structure of the medium is not damaged, the selection of single screw pump ideal delivery. ◠The characteristics of the pump Single-screw pump due to structural and operational characteristics, compared with the piston pump centrifugal pump, vane pump, gear pump has many advantages compared to: Single screw pump can deliver high solids content of the medium; single screw pump flow uniform pressure stability, Low speed is more obvious; single screw pump flow is proportional to the pump speed, which has good variable regulation; single screw pump with a multi-purpose pump can deliver different viscosity media; single screw pump pump installation position can be arbitrary tilt; Single-screw pump for conveying sensitive items and susceptible to damage by centrifugal force and other items; single screw pump small size, light weight, low noise, simple structure, easy maintenance. The selection of the pump The specification of the pump is based on the nature of the liquid being transported and the pressure and pressure, and the speed of the pump is selected by the viscosity and corrosivity of the delivered liquid as the main parameter to ensure the reliable operation of the pump. Pump design speed for the transmission of water or water similar non-corrosive liquids allow the maximum speed, in actual use due to the nature of the media and life requirements are different, the selection should generally be lower than the design speed. For high viscosity and medium containing particles, the design speed of 1 / 2-1 / 3 or lower is generally used. Low speed is good for pump wear. However, the wear rate of the stator decreases after use. At this time, the speed can be properly increased , To compensate for the decline in traffic is also a policy. Transmission medium temperature should be -10 ℃ ~ 80 ℃ in special cases up to 120 ℃. The normal pressure of each stage of the pump (one lead of the stator) is 0.6 Mpa, allowing up to 0.8 Mpa in a short period of time (less than 30 minutes), and gradually decreasing the volumetric efficiency at the same output pressure when worn. Pumping water maximum suction is 8 meters, the actual use of recommendations not exceeding 6.5 meters, when pumping high-viscosity media, should be positive pressure inhalation. G-type screw pump Concentrated pump is a single-screw pump, which is the main working parts of the eccentric spiral screw (called the rotor) and the inner surface of the double helical screw bushings (called stator). Its working principle is that when the motor drives the pump shaft to rotate, the screw rotates on its own axis on the one hand, and on the other hand, it rolls along the inner surface of the liner to form a sealed chamber of the pump. For one revolution of the screw, the liquid in the sealed chamber is pushed forward one pitch. With the continuous drive of the screw, the liquid is pressed from one seal chamber to the other in a spiral manner and finally out of the pump body. Thick pump is a new type of liquid conveying machinery, with a simple structure, safe and reliable work, easy maintenance, liquid continuous and uniform, the pressure stability and so on. The thick slurry pumps produced by our unit are all made of high quality stainless acid-resistant steel. The shaft material 2cr13 liner is made of non-toxic and tasteless rubber. The working temperature can reach 100 ℃. It can be used for conveying food pulp and viscosity 10000 Polassose sec. Contains solid slurry of slurry or gel, Suspension of corrosive media. Widely in the food, metallurgy, construction, pharmaceutical, chemical and other industrial sectors. Single Screw Pumps Transfer High Viscosity Media: Depending on the pump size, media with viscosities from 37,000 to 200,000 centipoise can be delivered. Medium containing particles or fibers: The particle diameter can be 30mm (not exceeding rotor eccentricity). The fiber length can be 350mm (equivalent to the pitch of 0.4 rotor). Its content is generally up to 40% of the media pit, the medium if the solid matter is a fine powder, the maximum content of up to 60% or more can also be transported. Requires delivery pressure is stable, the media do not like to destroy the inherent structure, the selection of single screw pump ideal delivery. ◠Use of the pump Single screw pump can be widely used in the following industrial sectors, conveying a variety of media. Chemical industry: acid, alkali, salt, all kinds of viscous, pasty milky chemical slurry. Exploration Mining: Various drilling muds, mining water, floating pulp and floats. Shipbuilding: bottom sewage, sewage oil, all kinds of fresh oil. Ceramics industry: clay