The self priming of the self priming pump means that the pump is started without filling the liquid in the suction pipe (but there must be enough liquid in the pump body), the pump itself can automatically sweep the gas in the suction pipe, and then enter the normal task, the pump is started for the first time. It is necessary to fill in sufficient liquid, and the liquid remaining in the pump body is activated at the time of starting to ensure that the pump can be started again. The self-priming time of the self-priming pump means that the pump is pumping normal temperature cleaning liquid, and the height of the device is the minimum time required to start the pump to the pressure swing when the suction vacuum is reduced by 0.5, that is, the pump is required to exhaust the air in the tube. time. For centrifugal self-priming pumps, the length of the suction line between the suction surface and the pump outlet should be less than the height of the pump unit plus 20D (suction tube hole diameter) for the suction between the suction surface of the vortex self-priming pump and the pump outlet. The length of the pipeline should be less than the height of the pump unit. In addition, the ordinary centrifugal pump is equipped with a bottom valve at the lowermost end of the suction line. Before the start-up, more water is required to overflow the entire suction line.
The common self-priming pumps are divided into 2 types, clear water and sewage. The suction stroke refers to the vertical height. If the horizontal distance can be extended, this needs to be determined according to the actual site conditions. To increase the suction stroke, the diameter of the inlet and outlet pipes of the pump can be slightly reduced, and the diameter of the inlet pipe must not be increased. After that, there will be a lot of air inside the pipe, which will prolong the time of pumping air from the self-priming pump. When the self-priming pump has not sucked in water for about 5 minutes, the pump body will heat up, and the self-priming pump will self-prime after the pump body is heated. The capacity will be reduced, so it can only be reduced. The impeller with double suction pump should be filled with water from both sides of the impeller. The maximum suction of the self-priming pump can reach 7 meters. If you add more vacuum pump and bottom valve. The suction can reach 10 meters.
The measurement and adjustment of the pump body includes three steps of aligning, finding the elevation and leveling.
1. Finding is to find the vertical and horizontal center lines of the self-priming pump body. The longitudinal centerline of the self-priming pump body is based on the centerline of the pump shaft; the transverse centerline is based on the centerline of the outlet tube. When aligning, measure and adjust according to the center line of the installed equipment (or the center line of the foundation and the wall column), so that the vertical and horizontal center lines of the self-priming pump body meet the requirements of the drawings, and other equipment. Connected very well. The longitudinal and transverse center lines of the self-priming pump body are within the range of 5 mm according to the size of the paper.
2. The elevation of the elevation pump is based on the centerline of the pump shaft. When looking for the elevation, the water level is generally used for measurement. During the measurement, put the benchmark on the reference point set in the factory, measure the height of the mirror core, then move the pole to the journal, measure the distance from the shaft surface to the mirror core, and then calculate the pump according to the formula. The elevation of the centerline of the shaft. The elevation of the center of the pump shaft = (the height of the core from the axis to the distance between the core and the diameter of the pump shaft) / 2 elevation adjustment, is also used to increase or decrease the self-priming pump body and the machine The gasket between the seats is done. The rib deviation of the center of the pump shaft is 10mm.
3. After leveling the position of the center line and the elevation of the self-priming self-priming pump body, it will start to adjust the level of the self-control self-priming pump body. First, use the square level instrument with the age of 0.05mm/m, the axis at the front and rear ends of the pump body. Measurements were taken on the neck. When adjusting the level, the thin iron sheet can be adjusted between the self-control self-priming pump body and the base. The horizontal allowable deviation of the self-control self-priming pump body is generally 0.3-0.5mm/m. After the center line position, elevation and level of the self-priming pump body are found, the connection between the self-controlled self-priming pump body and the base can be connected. The bolts are tightened, and then the level is checked for changes. If there is no change, the motor can be installed.