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供給渣漿泵葉輪入口密封的沖洗水，從根本上改變了液體在腔內(nèi)流動(dòng)特性及其角速度值。這個(gè)角速度值小于wn/2， 沖洗水量越大，角速度下降就越明顯。
液體在腔內(nèi)圓周速度下降，導(dǎo)致腔內(nèi)壓力增加，而且它越大，供給腔內(nèi)沖洗水量越大。
為了防止固體顆粒進(jìn)入葉輪入口密封和填料密封，即防止密封件磨損，一般供給沖洗水。
為了保證填料密封可靠的工作，沖洗水量應(yīng)為泵流量的0. 5%~1%，對(duì)于葉輪無副葉片的泵，其壓力p>0. 8prgH+p，對(duì)于葉輪后蓋板具有副葉片的泵，Pn>0. 6prgH十p，(式中，H、p:分別為泵的揚(yáng)程和泵入口壓力)。
為了保護(hù)葉輪入口側(cè)密封件，沖洗水量應(yīng)為泵流量的4%~6%，其揚(yáng)程近似等于供給填料密封沖洗水的水頭。
在固液混合物從壓水室內(nèi)溢流時(shí)，只有其粒徑小于葉輪輪緣和護(hù)板(在閉式側(cè)腔時(shí))之間徑向間隙的固體顆粒與固液混合物起流入腔內(nèi)。在從腔內(nèi)與固液混合物反向溢流到壓水室，從壓水室內(nèi)與固液混合物一起帶來的那些固體顆粒被帶走。因此，相當(dāng)小的顆粒參與上述溢流引起的磨損過程，固液混合物中這種顆粒越多，磨損強(qiáng)變就越大。
顆粒滲入腔內(nèi)(半徑方向上)的深度與很多因素有關(guān)，其中包括沖洗水量。例如在供給沖洗水量很小時(shí)，這從填料密封側(cè)發(fā)生，在葉輪后蓋板上具有副葉片時(shí)，固體顆料深入腔內(nèi)的長度大約等于R2/3.根據(jù)具有副葉片的葉輪試驗(yàn)得到，在很小半徑上沒有觀察到什么磨損，可是在出口半徑上磨損很嚴(yán)重。渣漿泵
The flushing water supplied to the impeller inlet seal of slurry pump fundamentally changes the flow characteristics and angular velocity of liquid in the cavity. This angular velocity value is less than wn/2, and the larger the amount of flushing water, the more obvious the decline of angular velocity is.
The lower the circumferential velocity of the liquid in the cavity, the higher the pressure in the cavity, and the larger the amount of flushing water supplied to the cavity.
In order to prevent the solid particles from entering the impeller inlet seal and packing seal, that is to prevent the seal from wearing, the flushing water is generally supplied.
In order to ensure the reliable work of packing seal, the flushing water should be 0.5%~1% of the pump flow. For the pump without auxiliary vanes, the pressure P > 0.8prgH+p. For the pump with auxiliary vanes on the back cover of the impeller, Pn > 0.6prgH10p. (In the type, H, P: respectively, the pump head and pump inlet pressure).
In order to protect the impeller inlet side seals, the flushing water volume should be 4%~6% of the pump flow, and its head is approximately equal to the head of the flushing water supplied to the packing seal.
When the solid-liquid mixture overflows from the pressure chamber, only the solid particles with a diameter smaller than the radial clearance between the impeller rim and the guard plate (in the closed side chamber) and the solid-liquid mixture flow into the chamber. The solid particles brought along with the solid-liquid mixture from the chamber are taken away when the solid-liquid mixture overflows into the pressurized water chamber in the opposite direction. Therefore, relatively small particles participate in the wear process caused by the above-mentioned overflow. The more such particles in the solid-liquid mixture, the greater the wear strength.
The depth of particle infiltration into the cavity (in the direction of radius) is related to many factors, including the amount of flushing water. For example, when the water supply for flushing is very small, it occurs from the sealing side of the packing. When there are secondary blades on the back cover plate of the impeller, the length of solid particles penetrating into the cavity is approximately equal to R2/3. According to the impeller test with secondary blades, no wear is observed on a very small radius, but the wear is very serious on the exit radius.
