The advantage of the diesel self-priming centrifugal pump is its self-priming capability, distinguishing it from other centrifugal pumps' operation. Simply fill the pump with water and start the engine when in use. No need to refill water each time thereafter. The principle is straightforward: the impeller inside the sump rotates, creating a vacuum within the casing, which relies on atmospheric pressure to push water into the pump, forming a circulation.
Once you understand the working principle, it's easy to solve the problem. The reason why the diesel self-priming centrifugal pump doesn't self-prime:
1. The pipeline is not sealed, causing gas leakage. This is a primary issue for many diesel engines that struggle to draw water with their self-priming centrifugal pumps. Simply checking the seals at all joints should resolve the problem.
2. The self-priming centrifugal pump's own sealing. As a sealing component, it is prone to wear, and its service life is generally related to the structure and material of the seal. Opt for high-performance mechanical seals to reduce the frequency of replacement. Typically, replacing the mechanical seal is sufficient in such cases.
3. Whether the suction lift of the diesel-driven self-priming centrifugal pump has been exceeded. Generally, the suction lift of a self-priming centrifugal pump is 5 meters. If the pump installation is too high and the inlet is too low, exceeding this height, the pump cannot suck up water or the suction force is weak, resulting in low water output. In this case, simply lowering the pump's installation position will resolve the issue.
4. Is the shaft linkage stuck? In this situation, it is mainly the connecting shaft that is stuck, causing the motor to exert a lot of force. However, the diesel engine's self-priming centrifugal pump turns very slowly. First, manually test to see if it can rotate. If it can't even be turned manually, the motor is definitely strained, and it might even overheat. The solution is to remove the impeller shaft to check if it's stuck, and then replace or adjust it as needed.
5. Did the进出口 on the self-priming centrifugal pump for diesel engines get installed backwards? This is a common-sense question, and such errors are usually not made. However, for users unfamiliar with machinery, it's possible.
6. The motor's reversing polarity issue has occurred multiple times. When the motor reverses, it definitely lacks power.
7. The motor's power is too low. Simply replacing it with a high-power motor will suffice.
8. Inspect the diesel engine self-priming centrifugal pump housing for sand hole leaks. Sometimes, even small sand holes, being numerous, and with paint on the outside, can be hard to detect. This is also a primary reason why self-priming pumps cannot self-prime. Solution: inspect the pump housing and seal the leak points.
