Multistage centrifugal and high-pressure water pump impeller seal structure and working principle

Multistage centrifugal high pressure water pump structure symmetry, can automatically balance the axial force and radial force, long service life, maintenance simple, widely used in oil transportation and high pressure water injection, and so on. So, high pressure multistage centrifugal pump impeller and sealing device have what effect?

multistage centrifugal high pressure water pump impeller structure and working principle of

high pressure centrifugal pump generally adopts closed impeller, it is composed of front cover, blade, HouGaiBan and hub. There are 4 - between before and after the cover plate 12 piece backward curved blade, blade and the inner wall of the cover plate of the blade groove; Impeller head is in the middle of a water inlet, water from the water inlet suction, through the blade slot and then thrown around the edges of the impeller direction of water flow in the impeller is axial feed, radial water. Size of the impeller is basically determined according to the fluid mechanics calculation and through the model test, at the same time must have sufficient mechanical strength. Irrigation and drainage pump impeller are made from cast iron, large water pump impeller material made of cast steel. Impeller casting quality should comply with the requirements, the castings shall not have sand holes, blow hole, crack defects, such as leaf slot to smooth level off, shall not be adhering sand, burr and uneven, otherwise it will affect the performance of the pump and the service life of the impeller.

multistage centrifugal high-pressure pump at run time, single suction pump impeller due to withstand water pressure on the back of the feed water side, therefore, will produce a pointing in the direction of axial force of the water side. This force can make the pump shaft axial channeling or cause impeller front cover and the water pump shell friction and damage to the impeller. In order to reduce or balance the axial thrust, can open some balance in impeller HouGaiBan near the hub hole. It makes the back of the impeller through balance hole of high pressure water flow to the inlet side and the balance of the pressure on both sides of the impeller is roughly. But after opening, the pump efficiency will be reduced. Small single suction, low head single-stage centrifugal pump, due to axial force is small, don't open balance hole.

multistage centrifugal high pressure water pump seal structure and working principle of

multistage centrifugal high-pressure pump seal basically has two kinds of packing seal and mechanical seal. Packing is also called the packing, the commonly used is oiled, asbestos rope of graphite packing, black lead powder coating appearance. Bottom ring and packing gland are usually made of cast iron, set in the ends of the shaft packing, to prevent and compact packing. Packing the degree of tightness, using the screw to adjust on the gland. If too tight, although can reduce leakage, but increased the friction loss between packing and shaft sleeve, shorten its service life, serious can cause fever, smoke, very burned; Too loose, will be a lot of leakage, reduce the efficiency. Using high pressure water to water seal water seal ring, at the same time also ACTS as cooling and lubrication pump shaft. Packing seal structure is simple, reliable work, but the service life of the packing is not long. When sealed medium for high temperature and high pressure, or water pump shaft speed is high, unfavorable use this kind of packing seal, and should adopt mechanical seal, rubber seal shaft sealing device.

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