Check the piping and joints of the self-priming pump for any looseness. Manually rotate the pump or use a tool to ensure it turns smoothly without resistance. Proper maintenance of the self-priming pump is essential for its performance and longevity. Here are some key maintenance steps:
(1) Inspect the pump’s pipeline and connections for leaks or loose fittings. Rotate the pump by hand or with a suitable tool to check for smooth operation.
(2) Ensure that the flow rate and head of the pump stay within the limits specified on the nameplate. Operating the pump at its optimal efficiency point will maximize energy savings and reduce wear.
(3) Monitor the bearing temperature during operation. The temperature should not exceed 35°C above ambient, and the maximum allowable temperature is 80°C.
(4) If you notice unusual noises while the pump is running, stop the unit immediately and investigate the cause to prevent further damage.
(5) When shutting down the sewage pump, first close the gate valve and pressure gauge before turning off the motor.
(6) If the self-priming sewage pump will be unused for an extended period, especially in cold winter conditions, drain the liquid from the pump body after stopping it. This prevents freezing and potential cracking. If the medium is sewage, flush the pump chamber with clean water to avoid clogging.
(7) Listen carefully for abnormal sounds from the motor. In a noisy environment, you can use tools like a screwdriver or a stick to touch the motor and identify vibrations or irregularities. This helps detect issues such as bearing wear, lack of lubrication, or misalignment. Timely actions like adding oil or replacing bearings can prevent serious failures.
**Common Causes and Solutions for Low Head in Self-Priming Pumps**
1. When a stainless steel self-priming pump is used to transport corrosive liquids, the impeller may become severely corroded. Replace the impeller if necessary to meet the design requirements. Also, adjust the clearance between the semi-open impeller and the pump cover to improve efficiency.
2. A faulty mechanical seal can lead to significant leakage. Check the spring compression, replace the spring if needed, and inspect the dynamic and static rings for corrosion, wear, or damage. Repair or replace damaged components.
3. Loose fixing screws can cause the spring to lose tension. Tighten the screws or re-adjust the spring as required.
4. Misalignment or deformation of the moving ring seal can affect performance. Reinstall or replace the seal ring as necessary.
5. If the static ring is misaligned, re-install it properly.
6. Poor machining of the bushing can affect the axial movement of the moving ring. Improve the precision and surface finish of the bushing.
7. Foreign particles or crystallized medium can interfere with the sealing surfaces. Clean all sealing components thoroughly to restore proper function.
**Causes and Solutions for Overheating of Self-Priming Pump Motor**
1. If the pump operates beyond its designed flow or head capacity, it can overload the motor. Choose a motor that matches the pump’s specifications.
2. Excessive specific gravity of the medium may require a more powerful motor. Ensure the motor is correctly matched to the application.
3. Over-tight packing glands or mechanical seals can increase friction. Adjust the spring compression accordingly.
4. Poor assembly quality can cause internal friction or misalignment between the motor and pump shaft. Recheck the assembly and fix any issues.
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Source: China Hardware Business Network – [http://news.chinawj.com.cn](http://news.chinawj.com.cn)
Editor: Hardware Business Network Information Center
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