sewage pump mixer

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The low speed submersible tank mixer is suitable for industrial and urban sewage treatment plants, including aeration and anaerobic tanks, large-scale nitrification and denitrification tanks, disc activated sludge treatment tanks, disinfection trucks, and industrial mixing. It generates a low tangential open strong water flow, which can create water circulation and nitrification, denitrification, and phosphorus removal stages in large volume fluids.

Application

Mixing and uniformity of sewage, wastewater, and sludge water

Thickening process

Sludge dewatering process

Heat transfer optimization

Cleaning of sewage pool

Prevent the condensation and sedimentation of particles on the pool wall and bottom

Remove suspended solids

Preventing icing

Create water flow

circulating water

Working condition

1) The medium temperature shall not exceed 40 ℃;

2) The pH value of the medium is between 5 and 9;

3) Liquid density not exceeding 1.15 kg/m3;

4) Long term diving operation, the diving depth generally does not exceed 20m.

Feature

1. The low speed QJB submersible mixer has a compact structure, small size, light weight, simple operation and maintenance, convenient installation and maintenance, and long service life.

2. The impeller has a good hydraulic design structure and high work efficiency. The swept back blade has self-cleaning function to prevent debris from winding and blocking.

3. Mixing with the aeration system can significantly reduce energy consumption, increase oxygen filling capacity, and effectively prevent sedimentation.

4. The insulation level of the motor winding is F level, the protection level is IP68, and disposable lubrication and maintenance free bearings are selected. It has oil chamber leakage detection, making the operation of the motor safer and more reliable.

5. Two independent mechanical seals, the friction pair material of the mechanical seal is corrosion-resistant tungsten carbide. All exposed fasteners are made of stainless steel material.

6. Good cable sealing design eliminates the risk of cable leakage.

7. The standard components adopt point separation technology, which can effectively prevent corrosion.

working principle

The working principle of submersible mixer: The mixing impeller is driven by an electric motor to rotate and stir the liquid to generate a rotating jet. The shear stress along the surface of the jet is used to mix, causing the liquid outside the flow field to generate stirring effect through friction. At the same time of mixing, a volume flow is formed, and the controlled fluid transportation should be achieved using a large volume flow mode.

Operation manual

Preparation before starting the submersible mixer

Before starting the equipment, it is necessary to check whether the submersible stirrer is in good condition and whether there is a large amount of sludge deposition around the equipment to avoid affecting its normal operation.

2. Check whether there is enough oil in the oil chamber, whether there is any oil leakage and sealing condition.

3. Whether the cable is damaged or broken, and whether the inlet sealing of the cable is complete

4. If the motor or control box has been repaired, before starting, it is necessary to check whether the current setting of the overload protector is appropriate, and conduct a jog test to observe whether the running direction of the submersible mixer meets the requirements.

5. If the submersible mixer stops for a period of time and does not operate, the motor should undergo insulation testing before starting. After confirming that it is normal, a jog test should be conducted to observe the operating current of the thruster. If the current is too high, the pump cannot be directly started for operation, otherwise overload may occur and the motor may be damaged.

The submersible thruster is turned on and running

After closing the brake, it is necessary to check whether the operation is normal, whether there is any jamming or abnormal noise.

2. Timely detect and remove debris to avoid accumulating too much and affecting the normal operation of the equipment.

3. If the submersible mixer stops for a period of time and does not run, and the current is found to be too high during the inching test, it is necessary to start the aeration operation for a period of time before running the submersible mixer.

4. Keep detailed records of equipment operation.

Submersible mixer control

1. Diving motor control - The operation of the motor is limited to designated personnel or technical personnel with relevant experience---- Three PTC resistors in series control the temperature of the stator winding. When the winding temperature exceeds a certain value (usually 125 ℃), the thermistor will act and disconnect---- If overheating occurs, the winding must be inspected by designated technical personnel. Perhaps it is inevitable to replace the stator, rotor, or winding separately---- When the mixer is stopped for a long time, the insulation resistance value needs to be measured. The manufacturer guarantees that the cold insulation resistance is greater than 100M Ω when leaving the factory, but the motor can still operate normally at 20M Ω. If it is less than 2M Ω, the mixer cannot be forcibly started. At this time, the power cable should be checked first, then the cable connection cavity, and finally the winding.

2. The sealing control leakage detection probe is used to detect the water ingress status in the oil chamber. When the water leakage reaches a certain level in the oil chamber, the resistance between the two leakage detection probes will change, and the control cabinet will send a signal accordingly. Despite this, the mixer can still run for a short time. To avoid damage to the mixer, immediate maintenance and replacement of the mechanical seal should be carried out.

For the safety of the equipment, the shutdown of the submersible thruster must strictly follow the following steps:

1. Confirm the working position of the mixer;

2. Press the stop switch on the control cabinet;

3. Stop the mixer completely;

4. During the lifting process of the mixer, it is never allowed to start.

5. Record the start and stop times