According to the production and processing methods can be divided into the following categories: Galvanzied Steel Sheet, Gi Plate, Galvanized Plate,Galvanised Steel Plate,Galvanised Plate Shandong Longhao Steel Group Co., Ltd. , https://www.longhaosteels.com
Ordinary centrifugal pumps, if the suction liquid surface under the impeller, should be pre-irrigation when starting, it is inconvenient. In order to store water in the pump, a suction valve inlet is required to install a bottom valve, and the bottom valve causes a large hydraulic loss when the pump is operated. The so-called self-priming pump, is not required before the start of irrigation (the first start after installation still need to water), after a short period of operation, relying on the role of the pump itself, that can suck up the water, into normal work. Self-priming pump is divided into the following categories according to the principle of action:
1. Gas-liquid hybrid (including internal mixing and external mixing)
2, water wheel 3, jet type (including liquid jets and gas jets). The working process of the gas-liquid hybrid self-priming pump: due to the special structure of the self-priming pump body, after the pump stops, a certain amount of water is stored in the pump body. After the pump is started again, the air and water in the suction pipeline are sucked due to the rotation of the impeller. Fully mixed and discharged to the air-water separation chamber. The gas in the upper part of the air-water separation chamber overflows. The lower part of the water returns to the impeller and mixes with the remaining air in the suction pipeline until the gas in the pump and the suction tube is completely discharged. Suction, and normal pumping. The water ring wheel type self-priming pump is a channel for the water ring wheel and the pump impeller, and drains the liquid in the water ring wheel. Jet self-priming pump, which is a combination of a centrifugal pump and a jet pump (or ejector), relying on a spraying device to create a vacuum at the nozzle to achieve suction.
â‘ Hot dip Galvanized Steel plate. The sheet steel is dipped into the melted zinc tank so that the surface is adhered to a zinc sheet steel. At present, continuous galvanizing process is mainly used to produce, that is, continuous immersion of rolled steel plate in the melting of zinc in the plating tank to make galvanized steel plate;
② alloyed galvanized steel plate. This steel plate is also made by hot dipping, but immediately after it is out of the groove, it is heated to about 500℃ to produce a zinc and iron alloy film. This galvanized sheet has good coating tightness and weldability;
â‘¢ Electric galvanized steel plate. The galvanized steel plate made by electroplating has good workability. But the coating is thin, corrosion resistance is not as good as hot dip galvanized sheet;
â‘£ Single-side plating and double-side difference galvanized steel plate. Single-sided galvanized steel plate, that is, galvanized products only on one side. It has better adaptability than double-sided galvanized sheet in welding, coating, rust prevention and processing. In order to overcome the shortcomings of single side without zinc coating, there is a galvanized sheet coated with a thin layer of zinc on the other side, namely double-sided differential galvanized sheet;
⑤ Alloy, composite galvanized steel plate. It is made of zinc and other metals such as aluminum, lead, zinc alloy and composite plating of steel plate. The steel plate not only has excellent anti-rust performance, but also has good coating performance;
In addition to the above five kinds, there are color galvanized steel plate, printing coated galvanized steel plate, PVC laminated galvanized steel plate and so on. But at present the most commonly used is still hot dip galvanized sheet.
What is the working principle of the self-priming pump?
What is the working principle of the self-priming pump?