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The function of the water pump is to pump water. Although it is not common in life, it can be used as often as we eat and drink water, because our daily water is pumped out by the water pump and sent to each household through the pipeline. The most commonly used in the home is the booster pump. This is that sometimes the tap water pressure is not enough, and a small self-priming pump or canned pump is needed to solve the problem for you. There are usually used heating, floor heating, solar water heaters will use a small water pump to facilitate our daily life.

1. What are the consequences of the pump running without phase?

There are single-phase and three-phase water pumps. In short, the single-phase pump is suitable for use with a domestic voltage of 220V, while the three-phase pump is suitable for an industrial voltage of 380V. If the three-phase electric pump (motor) runs in the state of lack of phase, the current required by the motor is the largest, and the temperature of the motor increases, which directly leads to the burning of the motor. Therefore, it is strictly forbidden to operate without phase.

2. Motor overheating

The main reasons are that the pump impeller is stuck, the voltage of the grid is too low or the use of the over-lift range, etc., the current is too large, or the temperature rise of the motor is abnormally increased. If no measures are taken, the motor will be burned.

3. Why does the actual power used by the pump sometimes exceed the rated power?

Because the selection of the pump is not suitable, such as a centrifugal pump, if the selected pump head is much higher than the actual head, when the pump is actually running, the lower the head, the greater the flow, the greater the power, and the easier it is to burn the motor. Therefore, it is very important for users to choose the type when buying a pump.

4. If there is no water, what is the problem with the pump running dry?

For the submersible pump, always pay attention to check the water level drop during the working process, and do not let the electric pump work above the water surface. During the operation of the pump, if there is a dehydration phenomenon, then:

1) Part of the heat generated by the pump during operation cannot be taken away by the water, and can only be dissipated by the pump’s own cooling system, which directly causes the temperature of the motor to rise and burns the motor;

2) Dry friction is formed between the pump impeller mouth ring and the pump body, which is easy to cause the impeller and the pump body to sinter and become stuck, resulting in an increase in the power of the motor and the burning of the motor;

3) The mechanical seal of the pump and the bearing (such as a water-filled submersible pump) wear increased, which affects the service life of the pump. Therefore, during the use of the pump, dehydration operation is strictly prohibited, and the pump should be regularly checked for dehydration operation.

5. When the pump is in use, it is often encountered due to improper selection or changes in the actual environment. When the pump lift is too high, what measures can be generally taken?

1) If there are processing conditions, the impeller of the water pump can be removed, and the outer diameter of the impeller can be reduced to make it suitable for use. The turning diameter can be calculated according to the following formula:

Impeller diameter after turning = (required head/raw pump head) square root × original pump impeller diameter

If the required lift cannot be grasped, it can be tested several times to finally meet the requirements.

2) The method of adding a gate valve or a stop valve on the water outlet pipeline can control the use head of the water pump and achieve normal use.

3) Change the size of the pulley for the pulley drive, and reduce the speed of the pump to reduce the lift.

4) Add frequency conversion control to reduce the output speed to reduce the lift