Self-priming sewage pump self-priming performance of the six factors

Self-priming sewage pump suction self-priming performance of the main factors: 1 • Determination of liquid storage volume and storage height The storage volume refers to the pump after the pump body can store the liquid part of the volume, which is the lowest self-priming sewage pump suction inlet Point below the volume of the pump body, this part of the volume is mainly the pressure chamber and gas-liquid separation chamber part. The volume of the reservoir should be not less than half of the pump design flow in seconds (for example, if the pump design flow is not less than the volume of the reservoir and the volume of the reservoir is too small [too little liquid is stored in the pump], self-priming Time increases, or even self-absorption; over, making the pump bulky. In addition to having a sufficient reservoir volume, there must also be a reservoir height, which is the height at which the pump sucks in to the center of the impeller, usually approximately equal to the impeller radius. 2 • The volume of the gas-liquid separation chamber and the height of the pump outlet of the self-priming sewage pump are determined. The gas-liquid separation refers to the part outside the pressure chamber of the pump body. The larger the volume, the better the separation effect of gas and liquid. Fast, but the volume of gas-liquid separation chamber to a certain extent, and then increase the effect is not significant, the reverse will make the pump bulky, so the gas-liquid separation chamber has an optimal volume value, according to the experience of its value is equal to or Slightly larger than the storage volume, in ensuring the gas-liquid separation chamber capacity case, the pump outlet to the height of the centerline of the impeller can be determined according to the liquid storage volume and gas-liquid separation chamber volume at drawing this height. 3 • Determination of liquid flow rate out of the chamber Centrifugal pump self-priming pump out of the chamber liquid flow rate than the average centrifugal pump is lower, about equal to the general centrifugal pump out of the chamber liquid flow rate of 80-90%. 4 • Determination of the clearance between the tongue and the impeller in the extrusion chamber For the centrifugal self-priming pump, the clearance between the separator and the impeller has a great influence on the self-priming performance. The clearance between the tongue and the impeller in the upper pressure chamber is smaller, Shorter, this gap is usually mixed outside; take mixed inside. If the design of the double cochlear chamber then the lower part of the pressure chamber separating the gap between the tongue and the impeller, usually according to the general centrifugal pump pressure chamber to determine the gap between the tongue and impeller to determine that the lower diaphragm located in the base of the volute chamber, and . 5 • Turning of the impeller rear cover For external mixing centrifugal self-priming pumps, when the impeller outer circle speed is less than the self-priming effect, the method of turning the impeller rear cover may be used to improve the self-priming capability because of the ease of self- Suction process of liquid and gas mixture. Turn the amount can not be too large, otherwise it will significantly reduce the pump head and efficiency. At that time, the impeller rear cover diameter after cutting; at that time, and in the separation of the tongue at the ribs to prevent bubbles with liquid in the cut off the back cover at the cycle, affecting self-absorption effect. 6 • The area of ​​the return hole For the inner mixing centrifugal self-priming pump, the area of ​​the return hole has a great influence on the self-priming performance and the area is large so that the liquid that returns to the inlet of the impeller through the return hole is large. The maximum vacuum degree of self-priming decreases; self-priming time is longer when the backflow hole area is small, and the height of the maximum self-priming vacuum is high. In summary, to determine the area of ​​the backflow hole, we must consider the self-priming time and self-priming height requirements.

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