Do you know submersible pump debugging steps?Let’s share with you!

A. Over-current and overload debugging:

The thermal relay current adjustment knob, and slowly to less than the actual operating current direction of rotation, each rotation a little scale, interval 2-5 minutes until the thermal relay action unit to stop working so far. And then reverse the rotation can be a little scale;

B. The lack of phase sensitivity debugging:

The unit to start again, and one by one off the unit knife switch fuse, the unit in two-phase power state. Observe whether the thermal relay can cut off the control power within 5 seconds;

C. Short-circuit test:

This step is usually dependent on the power supply system to protect the air switch. Generally do not make field tests (more dangerous) requires the power supply system must be equipped with air switch (air switch model preferred DW10 type, DZ type is the second choice).

Nanjing Forever Sewage Treatment Equipments Co., LTD. is a well-known submersible pump supplier, we are committed to providing customers with the best quality products, product quality assurance, reasonable price. Speaking of submersible pump flow, I think we will not particularly understand, here we give you a brief introduction about the determination of submersible pump flow.
1.If the submersible pump production process has been given the minimum, normal, maximum flow should be considered the maximum flow;
2.If the submersible pump production process only give the normal flow should be considered to leave a certain margin, for the large flow rate of ns> 100 low unexpected pump head flow allowance of 5% for ns> 50 low flow high head Pump flow allowance of 10%, 50 ≤ ns ≤ 100 pump flow margin also take 5%, poor quality and poor operating conditions of the pump flow margin should take 10%;
3.If the basic data only has the weight flow, should be converted into volumetric flow.

In order to ensure safe and stable operation of the submersible motor, we will add  pre-fill fluid to the submersible motor, then what is the role of submersible motor pre-filling?

Submersible motor pre-fill fluid has three roles: cooling, antifreeze, lubrication.

In order to prevent the submerged motor due to overheating and burn, in the submersible motor to add pre-fill fluid can play a cooling role in the winter weather cold submersible motor internal pre-filled liquid has played the role of antifreeze, so the submersible motor will not Because it is too cold and can not be normal operation; there also a role of the internal pre-filling fluid addition is to ensure lubrication, to prevent wear and tear.

1.Submersible pump pumping mud, overload caused by the medium density.
Measured medium density is greater than 1.3, or even 1.5 to 1.6; and the motor power factor is relatively small (generally 1.05 ~ 1.2).

2.The pump sedimentation, the impeller is brake caused overload, the motor is almost in the stall state operation.

3.The gap between the rotor shaft hole and the impeller mouth ring gap is filled with sand to brake overload caused by the shaft.

4.Individual manufacturers in order to lower prices in the competition to win, artificially reduce the motor power.

Nanjing Forever Sewage Treatment Equipments Co., LTD. technical guidance told that the main reasons for insufficient flow after the submersible pump running as following: water intake blockage; water pump into the depth of inadequate; pump speed is too low; seal ring or impeller wear too large; pipe too long; loss of pipe is too large

The above is about the reasons for the insufficient flow after the submersible pump running, the customer can solve the related problems by related reasons, so that the normal operation of the submersible pump can be guaranteed, and the problem of the submersible pump can be avoided, but necessary maintenance inspection need to pay attention to.

Submersible pump is a very professional mechanical equipment, and it is general machinery in the process of mechanical operation. But also a submersible diving machine, driving the entire diving process in the operation. The principle of the normal operation of the submersible pump is to carry out the rotation of the impeller movement, and the use of physical work principle, but also mainly to the submersible pump for mechanical work to use. During this operation, the energy in the machine during the operation of the impeller can be switched, that is, the initial mechanical energy is changed to the liquid energy of the liquid that the applied liquid has. And then through the energy transfer, the liquid can be transported through the submersible pump to the place where we want to carry out the use of liquid. This is a very important aspect. , And now the history of the emergence of submersible pumps is very early, the pump is the emergence of the predecessor of submersible pumps. And centrifugal pump is also a key. This is a very important aspect, but also the use of submersible pumps, where this is very important. It is because after the emergence of centrifugal pumps and submersible pumps, can appear with the centrifugal pump. This is also the predecessor of centrifugal pumps, and submersible pumps are used in a basic way of production, this is very important for the submersible pump.

Nanjing Forever Sewage Treatment Equipments Co., LTD. commonly used the following methods to regulate the flow of submersible pump: speed control, variable diameter adjustment, variable angle adjustment, throttle regulation.

1.Variable speed adjustment

Change the speed of the submersible pump, you can make the performance of the pump changes, so that the operating point of the pump changes, this method known as the speed of mediation.

2.Adjustable diameter

Impeller after turning, the performance of the pump will change according to certain laws, so that the operating point of the pump to change. We turn the impeller to change the pump operating point method, known as the adjustable diameter.

3.Variable angle adjustment

Change the angle of the installation of the blade can make the performance of the pump changes, so as to achieve the purpose of changing pump operating point. This way of changing the operating point is called the variable angle adjustment of the pump.

4.Throttling adjustment

For the water pipeline installation of the gate valve of the water pump device, the gate valve is small, in the pipeline to increase the local resistance, the pipeline characteristic curve becomes steep, its operating point along the pump Q-H curve to the upper left. The smaller the gate valve is closed, the greater the increased resistance, the smaller the flow becomes. This pass to close the small gate valve to change the pump working point method, known as the throttle adjustment or variable valve adjustment.

1.First remove the motor shaft and sleeve coupling between the positioning pin, and then release the motor and pump coupling bolts, the motor shaft and pump coupling separation.

2.The lower part of the motor bolts unscrew the drain, put the net water motor cavity.

3.Remove the foot, release the base, carefully remove the base and thrust bearings. Do not use the hammer in the split hitting the base, to avoid damage to thrust bearings.

4.Remove the thrust bearing, the thrust disk and thrust bearings placed in order to view repaired after use.

5.Remove the coupling flange on the upper part of the motor. Open the gland and carefully remove the mechanical seal. Such as the shaft end of the device is the rubber skeleton oil seal, with the guide bearing can be removed.

6.Remove the upper guide bearing, and then remove the lower guide bearing, together with the rotor out. Be careful not to rub the end of the stator windings to avoid damage to the winding insulation.

Submersible pump leakage is a common failure, but also endangering the safety of one of the most dangerous factors. If the submersible pump leakage, then close the knife, the transformer power distribution room in the leakage protector will trip. It should be noted that the transformer power distribution room must be configured with leakage protector, otherwise it will be very dangerous, will cause the motor burned.

Submersible pump leakage is mainly due to submersible pump pump body water, resulting in submersible pump motor winding insulation resistance decreases, resulting in protector movements. At this point with a shake table or multimeter R × 10kΩ block, measuring the motor windings have a certain leakage resistance of the shell. Submersible pump long-term use, resulting in serious wear and tear of the mechanical seal face, water infiltration, wetting the motor winding to form leakage.

Solve the problem of submersible pump leakage method is to remove the submersible pump motor on the drying room, or with 100-200W incandescent bulb drying; measure the insulation resistance infinity, and then replace the mechanical seal, Can be put into use.

Understand the phenomenon of submersible pump leakage, causes and solutions， when in the face of leakage problems can quickly determine and solve.