The screw pump is a positive displacement rotor pump which sucks and discharges liquid by displacement of a plurality of sealed chambers formed by the screw tooth shape of the pump and the pump sleeve. A rigid seal type screw pump is not called a theoretical leakage channel between two adjacent sealed chambers in a screw pump, and a non-strictly sealed type screw pump is the opposite.
æ¤The current practical application and related data show that the screw pump has a wide application range. It is characterized by stable flow, small pressure pulsation, self-priming capability, low noise, high efficiency, long life, small size and reliable operation. The outstanding advantage is that no eddy current is formed when the medium is transported, and various media with a wide viscosity range can be transported. It can transport lubricity or corrosive medium of various viscosities, non-Newtonian liquid of various viscosities, and gas and liquid. Mixed, solid and liquid mixed. It is widely used in offshore platforms, petrochemicals, shipping, electric power, mechanical hydraulic systems, food, paper, sugar, military and sewage treatment industries. In the words of the sales manager of Alvere, Germany: "There is no medium in the world, which cannot be transported by screw pumps."
Said 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. Screw pumps are usually divided into single screw pumps, double, triple and five screw pumps according to the number of screws. Each has its own advantages. It must have a choice when promoting the application of screw pumps. Only by making full use of their respective characteristics can we achieve better energy saving and festivals. Material, increase efficiency or meet certain special requirements.
The pump sleeve of a single screw pump is made of a non-metallic elastic material (usually rubber), and the inner hole has a spiral groove shape, and forms a plurality of sealed chambers with a spiral metal screw. The metal screw acts as an eccentric rotation to displace the sealed chamber from the low pressure region of the pump to the high pressure region, completing the entire process of inhaling, discharging liquid and forming pressure. In addition to general media, single-screw pumps can transport suspensions and special media containing metal particles, fibers, and more. When treating sewage and mud, a single screw pump is often 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 cylindrical cavities in the same direction. The two screws in the cavity mesh with each other, and the meshing screw teeth are in the pump sleeve and the screw. A plurality of sealed chambers are formed therebetween. 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 there is also a twin-screw double-screw pump. For the lubricating medium, if the helix angle is large enough, the main screw can directly drive the auxiliary screw. If equipped with a synchronizing gear, there is theoretically no contact between the two screws. Although the traditional twin-screw pump is not strictly sealed and the working pressure is not high, it can transport a variety of media with a wide range of viscosity, can transport non-Newtonian liquid 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 screw pump of Huangshan Aiken Machinery Manufacturing Co., Ltd. is theoretically a strictly sealed screw pump. In textbooks, it is usually introduced as a typical example of a screw pump. The three-screw pump is composed of a main screw in the metal pump sleeve and two driven screws. Each screw has two spiral lines, and a plurality of sealed chambers are formed between the pump sleeve and the screw. When the screw rotates, the sealed 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. The conveying medium is clean and 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 dimensions 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.
Screw pumps are usually non-rigidly sealed screw pumps. One main screw drives four secondary screws, and each screw has two spirals. Since the unit flow cross section of the pump chamber is large, the medium transport amount is large. The working pressure of the five-screw pump is usually below 0.8 MPa, and is often used in oil pumps for special occasions where the installation size is limited (eg, ships, ships, etc.).
Screw pump instruction manual 1. Stopping the screw pump When the screw pump stops, the discharge stop valve should be closed first, and the suction stop valve should be closed after the pump stops completely.
Due to the large length of the working screw and the poor rigidity, the screw pump is easy to cause bending and cause work failure. The connection to the shafting system must be well centered; the centering work is preferably carried out after installation and positioning, so as to avoid deformation caused by the pipeline; when connecting the pipelines, it should be independently fixed to minimize the impregnation of the pump. In addition, the spare screw is preferably suspended and fixed during storage to avoid deformation caused by uneven placement.
2. Starting of the screw pump The screw pump should be started with the suction and discharge stop valve fully open to prevent overload or suction.
Although the screw pump has a dry suction capacity, it must be prevented from dry running to avoid scratching the work surface.
If the pump needs to be started at a low oil temperature or high viscosity, the screw pump should be started with the suction and discharge valves and the bypass valve fully open, so that the load at the start of the pump is the lowest until the prime mover reaches the rated speed. Then gradually close the bypass valve.
When the bypass valve is opened, the liquid circulates continuously in the pump under throttling, and the more the circulating oil, the longer the circulation time, the more serious the heat of the liquid, and even the pump Damage caused by high temperature deformation must be noted.
3. The operation of the screw pump The screw pump must be operated in the specified direction to produce a certain suction and discharge.
When working on the pump, pay attention to check the pressure, temperature and mechanical shaft seal work. A slight amount of leakage should be allowed for the shaft seal. If the leakage does not exceed 20-30 seconds per drop, it is considered normal. If the screw pump produces noise during operation, it is often caused by too low oil temperature, too high viscosity of the oil, air entering the oil, loss of the coupling, or excessive pump wear.
Common knowledge of starting and running of screw pump;
The screw pump should be started with the suction and discharge stop valve fully open to prevent overload or suction. Although the screw pump has dry suction capacity, it must prevent dry rotation to avoid scratching the working surface. If the pump needs to be at low oil temperature or Starting with high viscosity, start with the suction and discharge valves and the bypass valve fully open, so that the load at the start of the pump is the lowest, until the prime mover reaches the rated speed, then the bypass valve is gradually closed. When bypassing When the valve is opened, the liquid circulates continuously in the pump under the condition of throttling, and the more the circulating oil, the longer the circulation time, the more serious the heat of the liquid, and even the high temperature deformation of the pump. Damage must be brought to the attention.
The screw pump must be operated in the specified direction to produce a certain suction and discharge. When the pump is working, check the pressure, temperature and mechanical shaft seal work. The shaft seal should allow a small amount of leakage, such as leakage not exceeding 20-30 Seconds/drops are considered normal. If the pump produces noise during operation, this is often caused by too low oil temperature, too high oil viscosity, air entering the oil, missing couplings or excessive pump wear.
When the screw pump stops, the discharge stop valve should be closed first, and the suction stop valve should be closed after the pump stops completely. The screw pump has a large length and low rigidity, which is easy to cause bending and cause work failure. Connection to the shafting system It must be well aligned; the centering work should be carried out after installation and positioning, so as to avoid deformation caused by the pipeline; when connecting the pipelines, it should be fixed independently to minimize the impregnation of the pump. In addition, the spare screw is in storage. It is best to use a suspension method to avoid deformation caused by uneven placement.
Contact: Zhang Jun TEL QQ http://kpslgb.cn.gongchang.com
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