prevent the loss of slurry pump

Volume loss and to prevent the loss of slurry pump

      Volume loss centrifugal china slurry pump seal ring leakage loss , loss of balance between the institutions and the level of leakage leakage losses.

A seal ring leakage loss

      In the impeller inlet , a sealing ring in the china slurry pump work, because the sealing rings on both sides there is a pressure difference , the side of the impeller outlet pressure is approximately one side of the impeller inlet pressure , so there will always be a part of the liquid from the impeller outlet to impeller inlet leakage . This part of the liquid obtained in the energy of the impeller , but the liquid is not sent, thus reducing the amount of water china slurry pump . All the energy used to overcome the leakage of the liquid seal ring on the resistance .
      Obviously, the larger the seal ring diameter Dw , the more poor on both sides of the pressure difference , the greater the amount of leakage . For stereotypes china slurry pumps, in order to reduce the amount of leakage to improve the efficiency of the china slurry pump should be permitted in the case of the sealing ring gap narrowing. Generally approximated total clearance seal ring diameter 0.002 , as Dw = 200 mm, the total clearance of 0.40 mm . When assembled, the seal ring eccentrically not too large, otherwise , the amount of leakage will increase . Another key measures used to increase the resistance of the seal ring method for reducing the amount of leakage , increase the resistance of the seal ring is made ??of a maze , zigzag , etc. It also increases the length of the seal ring seal , increasing the resistance along the way .
      Leakage of the seal ring , and in some cases may cause disturbance of the impeller inlet , so the design must reasonably form the seal ring .

Second, the balance mechanism leakage losses

      In many of the centrifugal china slurry pump , axial thrust balancing feature institutions : such as balancing holes , balance control, balance disc . Since there are two sides to balance the pressure differential mechanism , and thus a part of the liquid leakage from the high pressure region to the low pressure region . About 5% to reduce the leakage hole would balance the efficiency of the china slurry pump . In the balance disc institutions , leakage accounts for 3% of the work flow , but some of the high-pressure china slurry pump is greater than this ; in order to reduce leakage losses can be reduced balance disc diameter D without affecting the counterweight situation ‘ .

Third, the interstage leakage losses

      In the multi-stage volute china slurry pump , the level spacing on both sides of the pressure plate ranges , so there leakage losses , according to the arrangement of the different agencies , the level of pressure on both sides of spacer plates may be primary, secondary or tertiary , the more stages differ , then the more severe leakage between the partition level , so here is widely used among the stepped -stage seal.

      Further, in the multi-stage china slurry pump segment , there are inter-stage leakage . But this is leakage between the previously mentioned level is different, because this part of the liquid does not leak through the impeller , it does not belong to the volume loss . Here, the pressure level around the partition plate , pressurized by the diffusion effect of the vanes of the impeller -side portion and the suction gap ( equivalent to a centrifugal impeller ) caused. In the role of differential pressure , leakage of liquid level intervals along the board before entering the impeller gap backlash , and by the guide vanes, ABM leaf ( inhalation guide vanes ) and back into the gap between the level , repeat the process. Although inter- segment multi- stage china slurry pump leakage level does not belong to volume loss , but it’s so round flow to the china slurry pump power consumption . In addition, the portion of the liquid through the guide vanes, vane throat will cause the effective cross section decreases ( ie, leakage of liquid takes up part of the cross-section ) , it will increase the flow rate here , causing additional hydraulic losses . According to the ” centrifugal china slurry pump design basis ,” a book about : a multi-stage china slurry pump , at a flow rate of 20 l / s, the gap between the level decrease from 0.75 mm to 0.25 mm , interstage leakage quantity q decrease of 0.7 liters / sec. due to the reduction of q , the flow passing through the vanes is reduced, reducing the flow rate of the vane throat , reducing the water loss in the vanes , and because q reduce the relative speed of the impeller the liquid leaves the guide slot in the side reduced, thus reducing the friction loss of the impeller disc , so the china slurry pump efficiency is improved by about 5% .