1 material: material slurry pump impeller and volute, such as elastic material such as rubber, neoprene, polyurethane resin, commonly used in the occasion of the impeller outlet velocity is lower than 23 m/s, which can improve the pump NPSH effectively.
2 solid particles to the influence of the centrifugal pump, the flow of slurry pump – lift curve is relatively flat, and the pipeline flow resistance loss will increase with the increase of traffic and slow, pipeline characteristic curve and performance curve Angle is small, the head of a small changes can cause flow change significantly.
3 mechanical design, shaft, bearing, seal, pump body, etc.) : shaft and bearing must have higher strength and stiffness and reliability. Trapezoidal screw connection impeller generally can withstand heavy load, under the condition of heavy load using sliding thrust bearing and ball bearing is used commonly in light load conditions.
4 wear and hydraulic performance of problem: in order to reduce the wear and tear, should keep rotating components and fluid velocity is low enough, pump body hard alloy lining or elastic lubrication material cross section thickness should be increased, so as to meet the needs of practical operation. Of the radial profile of the impeller, generally close to the rectangle, and were less in the vertical plane using the front seal axial rotation area, general design of pump casing for half spiral, or circular, made at the highest efficiency near the point of wide range of small amount of wear and tear. When need large particles of solid conveying, usually is larger, the width of the built-in closed impeller blade number is reduced to 2-3 pieces, on the premise of improve the wear of the pump, pump hydraulic performance have different degree of reduced.
Slurry pump vice impeller shaft seal packing seal, seal, mechanical seal.
1, the slurry pump packing seal is to rely on in terms of hard and soft sealing effect between packing and shaft sleeve, packing seal and shaft seal water shaft seal water pressure must exceed slurry pump outlet pressure of 1.5 kg, the seal mode widely used in dressing plant, coal washery.
2, slurry pump mechanical seal mechanical seal, friction play a sealing effect of dynamic and static ring close points is divided into mechanical seal outside without water injection type mechanical seal, the water injection type wash in the mechanical seal, the water injection type mechanical seal. No water injection type mechanical seal does not need to add shaft seal water, the service life of about 4000 hours; Outside flushing water injection type mechanical seal and shaft seal water shaft seal water pressure of 1.5 kg, the service life of about 6000 hours; Water injection type washing mechanical seal with shaft seal water required, shaft seal water pressure than slurry pump outlet pressure of 1.5 kg, the service life of about 8000 hours.
3, vice impeller of slurry pump seal is produced by vice impeller pressure seal effect, the requirement of the slurry pump flow backward pressure not to exceed 15% slurry pump outlet pressure, when the user of the water shortage in this seal.
Post time: Jul-13-2021