Application field

In the chemical and petroleum sectors, raw materials, semi-finished products and finished products are mostly liquids, and the preparation of raw materials into semi-finished and finished products requires a complicated process in which the pump acts as a pressure source for transporting liquids and providing chemical reactions. In addition, in many devices, pumps are also used to regulate the temperature.

In agricultural production, pumps are the main irrigation and drainage machinery. China's rural areas are vast, and every year, a large number of pumps are needed in rural areas. Generally, agricultural pumps account for more than half of the total pump output.

In the mining and metallurgical industries, pumps are also used with more equipment. The mine needs to use pump drainage. In the process of mineral processing, smelting and rolling, pumps are needed to supply water.

In the power sector, nuclear power plants require nuclear main pumps, secondary pumps, tertiary pumps, and thermal power plants that require a large number of boiler feed pumps, condensate pumps, circulating pumps, and ash pumps.

In the construction of national defense, the adjustment of aircraft flaps, rudders and landing gear, the rotation of warships and tank turrets, and the ups and downs of submarines require pumps. High pressure and radioactive liquids, and some require pumps without any leakage.

In the shipbuilding industry, the pumps used on each ocean-going wheel are generally more than one hundred, and the types are also various. Others such as urban water supply and drainage, water for steam locomotives, lubrication and cooling in machine tools, conveying bleach and dyes in the textile industry, conveying pulp in the paper industry, and milk and sugar foods in the food industry require a large amount of Pump.

working principle

The impeller is mounted in the pump casing and fastened to the pump shaft 3, and the pump shaft is directly driven by the motor. A liquid suction 4 is connected to the suction pipe 5 in the center of the pump casing. The liquid enters the pump through the bottom valve 6 and the suction pipe. The liquid discharge port 8 on the pump casing is connected to the discharge pipe 9.

Before the pump is started, the pump casing is filled with the liquid to be conveyed; after starting, the impeller is driven by the shaft to rotate at a high speed, and the liquid between the blades must also rotate. Under the action of centrifugal force, the liquid is thrown from the center of the impeller to the outer edge and obtains energy, leaving the outer edge of the impeller at high speed into the volute casing. In the volute, the liquid decelerates due to the gradual expansion of the flow path, and part of the kinetic energy is converted into static pressure energy. After the Zui, it flows into the discharge pipe at a relatively high pressure and is sent to the required place. When the liquid flows from the center of the impeller to the outer edge, a certain vacuum is formed in the center of the impeller. Since the pressure above the liquid level of the tank is greater than the pressure at the inlet of the pump, the liquid is continuously pressed into the impeller. It can be seen that as long as the impeller rotates continuously, the liquid is continuously sucked in and discharged.

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