Stainless steel horizontal multistage pump and impeller

Stainless steel horizontal multistage pump is one of a large number of centrifugal pump industry, belonging to one of the more common products, generally driven by a motor. Before starting the pump, the pump body and the suction pipe are filled with liquid. When the impeller rotates at a high speed, the impeller drives the liquid between the blades to rotate together. Due to the centrifugal force, the liquid is thrown to the outer edge of the impeller from the center of the impeller (the flow rate can be increased to 15-25 m / s), and the kinetic energy also increases. When the liquid enters the pump housing, the stainless steel horizontal multistage pump gradually expands due to the flow passage in the volute-shaped pump housing, the liquid flow rate gradually decreases and a part of the kinetic energy is transformed into static pressure energy, so the liquid flows at a higher pressure along the discharge outlet Outflow. At the same time, a certain vacuum is formed at the center of the impeller due to the liquid being thrown out, and the pressure Pa at the liquid level is higher than the center of the impeller. Therefore, the liquid in the suction line enters the pump under the pressure difference. Impeller rotation, the liquid is also continuously being inhaled and pressed out. As the stainless steel horizontal multistage pump is able to transport liquid, mainly by the role of centrifugal force, it is called stainless steel horizontal multistage pump.
The role of the impeller is to transfer the mechanical energy of the prime mover directly to the liquid to increase the hydrostatic pressure and kinetic energy of the liquid (mainly increasing the static pressure energy). Impeller has open, semi-closed and closed three. The open impeller has no cover plate on both sides of the blade, which is simple in manufacture and convenient in cleaning. It is suitable for conveying materials containing a large amount of suspended matter, which has low efficiency and low pressure of liquid to be transported. The semi-closed impeller has no cover on the suction inlet side Plate, and on the other side of the cover, suitable for conveying easily sediment or particles containing materials, the efficiency is lower; closed impeller impeller on both sides of the blade has a front and rear cover, high efficiency, suitable for the delivery of impurities Clean liquid.
Impeller is a stainless steel horizontal multistage pump key components.
(1) According to its mechanical structure can be divided into closed, semi-closed and open three. Closed impeller for conveying cleaning fluid; semi-closed and open impeller for conveying solids containing suspension, such pumps are inefficient. Closed and semi-closed impeller in operation, part of the impeller away from the high-pressure liquid can leak into the cavity between the impeller and the pump housing, because the impeller inlet pressure liquid front is low, so the liquid on the impeller before and after Side of the pressure range, they have to point to the impeller suction side of the axial thrust. stainless steel horizontal multistage pump impeller impeller to move to the suction side, causing the impeller and the pump housing contact at the wear and tear, causing severe pump vibration, damage to the normal operation of the pump. stainless steel horizontal multistage pumps drilled a number of small holes in the impeller rear cover to reduce the pressure difference on both sides of the impeller, thereby reducing the adverse effects of axial thrust, but also reduces the efficiency of the pump. These holes are called balance holes.
(2) According to the different liquid suction method, the impeller can be divided into single suction type and double suction type. The single suction type impeller has a simple structure and the liquid can only be sucked in from one side. Double-suction impeller can absorb fluid symmetrically from both sides of the impeller at the same time, which not only has a larger suction capacity, but also basically eliminates axial thrust.
(3) According to the geometry of the blade on the impeller, the blade can be divided into three kinds after bending, radial and forward bending, which is widely used because kinetic energy of the back bending blade is converted to static pressure energy.
In order to reduce the energy loss due to impact when the liquid leaving the impeller directly enters the pump casing, a fixed guide vane with vanes is sometimes arranged between the impeller and the pump casing. The vane in the guide wheel gradually turns the liquid entering the pump casing and the runner continuously expands, so that part of the kinetic energy is effectively converted into the static pressure energy. Multi-stage stainless steel horizontal multistage pumps are usually installed guide wheel. Snail-shaped pump shell, the impeller on the back of the curved blade and the guide wheel can improve kinetic energy conversion rate to static pressure, it can be seen as a transformable device.
China haina pump stainless steel horizontal multistage pumps are the most widely used in chemical production due to their wide range of properties (including flow rate, pressure head and adaptability to media properties), small size, simple structure, easy operation and uniform flow rate , Less failure, long life, acquisition costs and operating costs are lower and other prominent advantages.