The motor system plays a crucial role in the submersible sludge pump as it serves as the power source for the entire device. Operating in a submerged liquid environment, the submersible sludge pump faces unique working conditions that demand superior waterproofing performance from its motor system. The presence of water within the motor system can lead to short circuits or even complete motor failure, disrupting the smooth flow of fluids.

Given these circumstances, it is of utmost importance to enhance the waterproof treatment of the submersible sludge pump motor. This involves implementing robust measures to prevent water ingress and ensure the motor’s protection. By strengthening the waterproofing capabilities, the submersible pump can operate reliably and efficiently, delivering uninterrupted fluid transportation.

Addressing the waterproofing requirements of the motor system is essential to maintain the pump’s performance and safeguard against potential damage caused by water infiltration.

1. Structural analysis of sealing and protection device for submersible sludge pump motor.

The function of the submersible sludge pump sealing system is to maintain the sealing of the whole submersible sludge pump and protect the motor unit from erosion and damage. Its main structures include cable seal, parts seal and bearing seal. The sealing device has good mechanical strength and good resistance to corrosive substances, thus providing protection for key components.

The submersible sludge pump is equipped with an automatic protection device to prevent the submersible sludge pump from running for a long time under high temperature. When the operating temperature exceeds the set temperature for a certain period of time, the motor device will stop running, and start running after the winding temperature drops. At the same time, the submersible sludge pump is equipped with water inlet protection. When the water seal of the submersible sludge pump leaks, the water invades into the oil chamber, and the resistance of the oil chamber drops rapidly. At this time, the motor leakage protection system of the submersible sludge pump will give an alarm and automatically cut off the operating power supply of the submersible sludge pump, waiting for the next overhaul and maintenance. The motor waterproof setting of the submersible sludge pump is very important. The floating ball of the submersible sludge pump can detect the sealing condition of the motor and evaluate whether water infiltration has occurred. When water enters the cavity next to the bearing, the failure of the mechanical seal will directly cause the floating ball to float up, thus touching the floating ball switch nearby and cutting off the running electric device. Send out corresponding alarm signal.

submersible sludge pump (3)
submersible sludge pump (3)
submersible sludge pump (3)

2. Cause analysis of water inlet fault of submersible sludge pump motor.

The long-time operation of the submersible sludge pump under water will lead to the failure of the motor sealing system. The following is a detailed analysis of the causes of the water inflow fault of the submersible sludge pump motor:

2.1 Cable damage.

Cable damage is a major contributor to water ingress faults in the motor of submersible sludge pump. During operation, the submersible pump is positioned at a certain distance below the water surface. To supply power to the pump, the cable needs to be submerged in water and connected to the submersible sludge pump. Additionally, the pump requires constant positioning adjustments to achieve higher slurry concentration. However, the cable is heavy, and during pump operation, it may come into contact with the steel wire rope, resulting in insulation damage and water penetration into the pump’s motor. In severe cases, this can lead to motor burnout, disrupting the operation of the submersible sludge pump. To mitigate this risk, it is crucial to carefully manage cable placement, prevent cable and steel wire rope friction, and ensure adequate insulation protection to prevent water ingress and maintain the pump’s functionality.

2.2 Improper protection of control cabinet.

The submersible sludge pump is designed with an upper and lower structure. The upper part includes a wiring room equipped with a groove-shaped catchment tank at the bottom. Additionally, a floating switch is installed in the tank. When water enters the wiring room, it flows directly into the catchment tank. The rising water level in the tank triggers the floating switch, activating the motor water inflow alarm signal and safeguarding the motor against damage. However, in some submersible sludge pumps, the height of the float switch in the wiring room is improperly set. As a result, the accumulated water fails to reach a level that triggers the alarm device. Nonetheless, the presence of accumulated water can still lead to short circuits or motor burnout within the entire motor system. It is important to ensure that the float switch is appropriately positioned to effectively detect water ingress and protect the motor from potential harm.

2.3 Seal damage of submersible sludge pump.

The submersible sludge pump operates submerged in water for extended periods, and it encounters a complex transportation medium. These conditions increase the likelihood of damage to its sealing device. When the water medium contains a high concentration of suspended solids or exhibits strong corrosiveness, prolonged operation can lead to seal damage and subsequent water leakage. Furthermore, improper installation of the submersible pump’s oil seal or selecting an inappropriate seal type can reduce the seal’s lifespan and expedite its deterioration.

The presence of suspended solids or corrosive elements in the water medium poses a significant challenge to the pump’s sealing integrity. The continuous exposure to such conditions gradually weakens the seals, compromising their ability to prevent water leakage. To mitigate this issue, it is essential to select seals specifically designed for the operating conditions and ensure proper installation techniques are implemented. Regular inspection and maintenance of the seals can also contribute to prolonging their service life and preventing water leakage in the submersible sludge pump.

3. Treatment method for water inlet fault of submersible sludge pump motor.

Water ingress into the motor of a submersible sludge pump can lead to operational failure. If the water inlet alarm system within the submersible pump malfunctions, the motor may be at risk of burning out. The following provides a detailed analysis of treatment methods for addressing water ingress faults in the motor of a submersible sludge pump.

3.1 Improve the fixing method of submersible sludge pump cable.

To enhance cable protection and minimize wear, it is recommended to incorporate a cable reel that allows for easy collection and release of cables. This prevents cables from falling into the water or becoming entangled with the hoisting rope, pump, or pipeline. Proper positioning of the cable drum, pump hoist, and pipe hoist is crucial, leaving adequate space for the movement of the cables. This ensures smooth cable operation, reduces the risk of damage or entanglement, and improves overall cable longevity. By implementing these measures, the protection and maintenance of cables in submersible sludge pumps can be effectively optimized.

3.2 Inspection and replacement of submersible sludge pump seal.

The sealing of the submersible sludge pump is the key to avoid water ingress into the motor, so the sealing inspection of the submersible sludge pump should be strengthened. As the long-term use of submersible sludge pump will cause its sealing performance to be reduced, the quality inspection of sealing shall be strengthened and the sealing with quality problems shall be replaced in time. Especially in the severe water quality of the working environment, the inspection frequency of mechanical sealing elements should be strengthened. The key parts with frequent water inlet alarms should be subject to key sealing inspection. When the seal of the pump is worn, it shall be replaced in time to avoid the water inflow fault of the motor.

3.3 Replace the water leakage protection element of the submersible sludge pump in time.

In case of water inflow fault of the motor of the submersible sludge pump, the power supply of the motor shall be cut off in time to avoid greater damage to the submersible sludge pump. Timely replace the water leakage protection element of the submersible sludge pump to improve the detection accuracy of the water leakage signal. The low sensitivity of the float switch is easy to cause serious water leakage in the water tank of the wiring room, and it is easy to be stuck by oily substances, thus losing the detection function. Therefore, a water leakage probe with simpler structure and higher sensitivity shall be used. This water leakage probe has higher detection sensitivity. Even if a small amount of water enters, it can send an alarm signal in time and cut off the power supply to avoid greater structural damage to the submersible sludge pump.

3.4 strengthen the handling of transportation media.

The transport medium will cause certain damage to the sealing device of the submersible sludge pump, and different transport media have different damage to the submersible sludge pump. The transport medium with more suspended solids or strong corrosivity is easy to cause damage to the sealing device of submersible sludge pump motor. Therefore, for the water with poor water quality or corrosive water, the type of submersible sludge pump and the materials of its parts should be correctly selected to ensure that the rotating shaft of the motor and the external oil seal are installed correctly, and the monitoring of water quality and the maintenance of the submersible sludge pump should be strengthened to improve the water inflow prevention effect of the submersible sludge pump motor protection system.

4. Summary

The analysis and treatment of water inlet faults in the submersible sludge pump motor are crucial for ensuring its proper functioning. Water ingress into the motor can lead to operational failure or even motor burnout. One common cause of water ingress is cable damage, which can occur when the heavy cable rubs against the steel wire rope, causing insulation damage and allowing water to enter the motor. To address this issue, careful cable placement and insulation protection measures are necessary.

Another factor to consider is the sealing of the pump. Prolonged operation in complex and corrosive water mediums can damage the pump’s seals, resulting in water leakage. Proper selection and installation of suitable seals can help mitigate this risk.

Additionally, the water inlet alarm system within the submersible pump plays a crucial role in detecting and signaling water ingress. Regular maintenance and testing of this system are essential to prevent motor damage.

Overall, a comprehensive approach is needed to analyze and treat water inlet faults in submersible sludge pump motors, including cable management, seal integrity, and alarm system maintenance. By addressing these factors, the reliability and longevity of the submersible sludge pump motor can be significantly improved.

4. About OCEAN Pump

Tai’an Ocean Pump (OCEAN Pump) Co., Ltd. is the leading submersible sludge pump and sand dredger solutions manufacturer, supplier and exporter in China. We have more than 30 talented sand pump experts and 15,000 square meters factory. More than 4 series 20 kinds of dredge pumps, slurry pumps, sand dredger machines and related parts had been manufactured to satisfy your pumping requirements.

Product innovation and customer satisfaction are our continuous commitment to all our partners. OCEAN Pump is the Certification of New Hi-tech Enterprises by the Government. We provide our customers with a complete set of sand, slurry, gravel pumping solutions and related parts. They are widely used in mining, metallurgy, coal washing, power plants, sewage water treatment and dredging in such industries as mine, chemical and petroleum. We are looking for pump dealers all over the world. If you have any needs or interests about our products, welcome to contact us in any time! Waiting for your message.

Lingda Kong
Tai’an Ocean Pump Co.,Ltd
Mobile/Whatsapp/Wechat: +86 18562293317
Email: oceanpump_lingda@tsbeng.com

sales@slurrypumpdm.com
Website: www.slurrypumpdm.com