Improve the efficiency of high-lift pump itself

High lift water pump is one of the most widely general machinery, and power consumption, energy consumption and improve the efficiency of the pump itself and the pump efficiency to save energy.

method to improve the efficiency of the high-lift pump itself:

1, the blade suction to extension and thinning, which led to earlier liquid by blade, impeller diameter can be reduced, also can increase the length of the blade passage flow, reduce the relative diffusion; But extends to appropriate, too forward can make into Et area is too small, make the blade inlet fellowship with blade plate wall Angle decrescent, instead of increasing hydraulic friction loss, crowded import port, unfavorable for cavitation and efficiency.

2, between adjacent blade passage is the ratio of export and import area control in 1. 0 to 1. 3, to reduce the spread loss. If the ratio is greater than l. 3, serious flow diffusion and efficiency decline.

3, the greater the hydraulic radius of flow channel, the better, as far as possible make the blade inlet section near the square, in order to reduce friction loss, know by hydraulics, water cross section area and the ratio of wet week called hydraulic radius, namely hydraulic radius a week sectional area/wet water. Wet weeks, in fact is liquid and the surface contact area is large, when the flow channel section from the approximate square becomes long and narrow rectangle, in essence is to make the liquid flow within the narrow section clearance, so must be great resistance.

4, due to the bending diffusion tube hydraulic loss is bigger, now most the slightly bent close to the spread of the straight line segments. For anti-missile leaf, its inlet Angle and position in the circumferential direction, should be combined with fluid flow in a diffuser flow, principle is to form a continuous flow, avoid anti-missile leaves port too narrow entrance section, otherwise the anti-missile blade inlet causes eddy current loss and impact.

5, the multi-stage pump, the impeller inlet and prerotation ( Abm blade outlet Angle less than 90. ) , reduce import relative speed impeller, and at the same time reduce the relative velocity spread, when selecting anti-missile blade outlet Angle less than 90. Before, the flow of water into the impeller produced prewhirl, can. 1≠0。

6, because of the anti-missile blade outlet Angle caused by the prerotation has a great influence on the characteristics of the impeller in the next level, in order to make the theoretical lift when the design formula of Ht - U2Vu2 in a 'lVul' 1 vul item is zero, the missile leaves of outlet Angle should be selected 90. , it can eliminate for level at the end of the guide vane rotating components. But experiments show that the efficiency and stability of the performance curve is adverse, especially for some low specific speed pump, in order to obtain the decline curve, anti-missile blade outlet Angle should be less than 90 degrees, usually in the 60 ~ 80 degrees. The ends of the blades to thin some, lest produce the impact and eddy current losses.

blade runner section:

7, the impeller output width was increased, reducing impeller exit absolute speed, so as to reduce the hydraulic losses in the pressurized water chamber.

8, oblique flow before and after impeller outlet, reducing the length of the poor or streamline to select different blade outlet Angle, in order to reduce the plate before and after the flow pressure difference, thus reducing export secondary circumfluence.

9, increase the pressurized water chamber throat area, the area of hours when the original design, can make the flow from the block.

reduce mechanical and friction loss

1) bearings, packing caused by mechanical friction loss is generally small, little influence on efficiency. Packing seal of mechanical friction loss is bigger than mechanical seal, if can use mechanical seal bei 4 is better.

(2) improve the surface of impeller and guide blade runner. If possible, had better use handheld grinding wheel surface of grinding tools such as the flow path, thus, hydraulic friction loss will be significantly reduced.

(3) before and after impeller cover plate surface and the liquid of disc friction loss, the direct ratio with the impeller diameter 5 times. Select larger blade outlet Angle can reduce the impeller diameter, thereby reducing the disc friction loss. Disk friction loss and surface roughness big relations, impeller cover plate outer wall should be smooth. Reduced q gap between impeller cover plate and guide vane can also reduce the disc friction loss.

reduce leakage:

appropriate to reduce the gap or lengthen the parts asked sealing gap and the labyrinth seal, etc. , increase the leakage resistance, in order to reduce volume loss.

inside the pump leak occurred in the impeller and the sealing ring, multi-stage pump, axial force balance between devices, etc.

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