Self-priming pumps have no suction causes and processing methods
First, the newly installed self-priming pump no suction
Newly installed self-priming pump suction is very small or no suction may be due to:
1, the inlet pipe leakage caused by the reason.
2, the installation of the inlet pipe is too large, too long caused by.
3, did not add water to the pump cavity inside the reason.
4, is the self-priming pump motor reversed due to the reason.
If the pipeline leakage can be tested or negative pressure test, if the hose can be installed at both ends of the pipe boring and in the middle of the pumping pipe to install a 3-way connecting the ball valve and the vacuum table, and then supporting a vacuum pump for pumping the negative pressure test, the negative pressure pumped to the limit value of the pumping pipe in the middle of the ball valve is closed and then observe the vacuum table whether there is a drop. Users often remove the self-priming pump inlet with a hand to the inlet to sense the suction size, to determine where the problem is, in fact, this test method is wrong. Due to the conventional self-priming centrifugal pump is not suction speed is very fast, just can be a fully closed pipeline slowly to the pipeline inside the air pumped clean so that it reaches a certain negative pressure after the liquid can be pressed up, when the inlet pipeline after the removal is not able to sense the suction is certainly sensed. If it is because the self-priming height is too high, the pipeline self-priming distance is too long, resulting in self-priming pumps can not suck up the liquid, you can choose a high suction range self-priming pump products.
Second, the normal use of the self-priming pump a little suction is not what is the reason:
Normal use of the self-priming pump if there is suddenly no suction, check the self-priming pump cavity and the impeller has not encountered the phenomenon of clogging, maintenance first power off and close the import and export valves, the self-priming pump body drain bolts to open the pump cavity inside the water put clean, the motor foot bolts to remove, and the coupling to separate the bottom corner of the motor directly connected to the motor bolts to open, and then the pump cover above the circle of bolts to remove, can be the bearing and the impeller together, move out, move out, the bearing and the impeller, the impeller, and then the pump cover, and then the pump cover, and the impeller. After removing the impeller, you can see whether there is any clogging debris on the impeller.
balance plate and balance plate with improper clearance, shaft and impeller, impeller mouth ring and guide wing anti-friction ring with excessive clearance (caused by different centers);; ③ impeller damage (caused by different centers); ③ impeller damage (caused by different centers); ③ impeller damage (caused by different centers).
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If the pipeline leakage can be tested or negative pressure test, if the hose can be installed at both ends of the pipe boring and in the middle of the pumping pipe to install a 3-way connecting the ball valve and the vacuum table