The screw pump is a positive displacement rotor pump, which is a suction and discharge of liquid by the displacement of a plurality of sealed chambers formed by the screw tooth shape of the pump and the pump sleeve. There is no theoretical leakage passage between two adjacent sealed chambers in the screw pump. Strictly sealed screw pump, and vice versa is a non-strictly sealed screw pump.
æ¤The current practical application and related data show that the application range of the screw pump is very wide. It is characterized by stable flow rate, small pressure pulsation, self-priming ability, low noise, high efficiency, long life, small volume and reliable operation. The advantage is that no eddy current is formed when conveying the medium. It can transport various media with a wide viscosity range, and can transport lubricity or corrosive medium of various viscosities, non-Newtonian liquid of various viscosities, and gas-liquid mixture. Transmission and solid-liquid mixing. It is widely used in offshore platform engineering, petrochemical, shipping, electric power, mechanical hydraulic systems, food, paper, sugar, military and sewage treatment, etc. Said: "There is no medium in the world, which cannot be transported by the screw pump."
It is said that the screw pump can transport any medium. Of course, it is not that a screw pump can transport all the media, but different types of screw pumps can be selected according to the characteristics of the medium and the number of performance parameters. The screw pump is usually divided into singles according to the number of screws. Screw pump. Double. Three and five screw pumps have their own advantages. They must have a choice when promoting the application of screw pumps. Only by making full use of their respective characteristics can they achieve better energy saving. Saving materials, increasing efficiency or satisfying certain specials. Claim.
The pump sleeve of the single-screw pump is made of non-metallic elastic material (usually rubber). The inner hole is in the shape of a spiral groove. It forms a sealed cavity with a spiral metal screw. The metal screw rotates eccentrically. The sealing chamber is displaced from the low pressure zone of the pump to the high pressure zone to complete the process of inhaling, discharging the liquid and forming the pressure. In addition to the general medium, the single screw pump can transport the suspension and the special medium containing metal particles and fibers. When treating sewage and mud, a single screw pump is usually used, and the working pressure is usually not high.
The conventional twin-screw pump is a non-strictly sealed screw pump. The pump sleeve made of metal material has two phase-cut cylindrical cavities. The two screws in the cavity mesh with each other. The meshing screw teeth are in the pump sleeve and the screw. A plurality of sealed chambers are formed. When the screw rotates, the sealed chamber is displaced from the low pressure region of the pump to the high pressure region. There is a single-headed spiral and a double-spiral twin-screw pump. For the lubricating medium, if the spiral angle is large enough, the main The screw can directly drive the auxiliary screw. If it is equipped with a synchronous gear, there is no contact between the two screws in theory. Although the traditional twin-screw pump is not strictly sealed and the working pressure is not high, it can transport various media with a wide viscosity range. It can transport non-Newtonian liquids of various viscosities, and can also be mixed with gas and liquid. Solid-liquid mixed. Therefore, all industries have placed great interest in it, especially in the petroleum and chemical industries.
The three-screw pump is theoretically a strictly sealed screw pump. In the textbook, it is usually introduced as a typical screw pump. The three-screw pump is composed of a main screw in the metal pump sleeve to drive two driven screws. Each screw has two spiral lines, and a plurality of sealing chambers are formed between the pump sleeve and the screw. When the screw rotates, the sealing chamber is displaced from the low pressure region of the pump to the high pressure region. The maximum working pressure of the three screw pump can reach 30Mpa, and the conveying The medium is clean. Non-corrosive lubricating oil. It can transport high viscosity and non-corrosive medium (such as ink, glue, etc.) in special occasions. Due to the structural size of the three screws 1:3:5 ratio and other reasons The three-screw pump delivers a limited range of medium viscosity and is generally limited to lubricating media.
The five-screw pump is usually a non-strictly sealed screw pump. One main screw drives four secondary screws, each of which has two spirals. Since the unit has a large flow cross section, the medium is transported in a large amount. The five-screw pump Working pressure is usually below 0.8MPa, often used in special occasions where the installation size is limited (such as: ships, ships, etc.) for oil pumps.
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