The most common fault scene in the use of the air cooler is the occurrence of non-refrigeration, that is, the failure of the internal pump of the equipment. Below we will analyze some common faults and maintenance methods of the submersible pump.

Submersible pumps often encounter problems such as oil leakage, leakage, tripping, tripping, impeller rotation, low flow, low speed, etc. In the following, detailed analysis of these common faults is carried out:

1, the impeller speed is low, the lift can not reach

Many customers found that the actual head was not up to the standard head when they started using the submersible pump that was just bought. The measurement found that the speed was also low. This situation may be incorrect wiring, it is recommended to change the fire line. It is also possible that the submersible pump is inferior and the lift is not reached.

2, submersible pump water supply is weak, small flow

Take out the submersible pump and check that the rotor is flexible and the rotor can be turned on. When the pump was disassembled, it was found that the lower end of the submersible pump was loose between the shaft and the bearing, and the rotor was moved downward, so the rotor was weak and the output power was small. Use a suitable gasket pad between the rotor and the bearing to move the rotor up and install the test machine. The fault can be eliminated.

3. After the power is turned on, the impeller does not turn.

After the power is turned on, the submersible pump has a humming sound, and the impeller does not rotate. Turn off the power and push the impeller at the water inlet. If it does not move, the rotor is stuck. The submersible pump can be disassembled to check whether the ball of the lower end bearing of the rotor is broken and the rotor is stuck; if the impeller can be turned, but the impeller does not rotate after being energized, the cause of the failure may be severe bearing wear, and the magnetism generated by the stator will attract the rotor when energized. Can't turn. Replace the bearing and reassemble the pump. The impeller is flexible and the fault is eliminated.

4, oil spill

The oil leakage of the submersible pump is mainly caused by the serious wear of the sealed box, resulting in oil leakage in the sealed box oil chamber or poor sealing at the outlet box.

When the oil in the sealed box oil chamber leaks, oil traces are visible at the water inlet section. There is a refueling hole at the water inlet section, and the screw is unscrewed to see if the oil chamber is filled with water. If the oil chamber enters the water, the seal is poor. The seal box should be replaced to prevent the oil chamber from entering the water and infiltrating into the motor. If the root of the submersible pump cable is oily, it is a leak in the motor. Generally, the sealing plug is poorly sealed or the lead is unqualified after the motor is re-wound; some are caused by the rupture of the pump terminal block. After the inspection is confirmed, you can change the qualified new product. And measure the insulation degree of the motor. If the insulation is not good, it should be treated in time, and the oil in the motor should be replaced.

5, leakage

Leakage is the most common failure of submersible pumps and one of the most dangerous factors that endanger personal safety. The fault phenomenon is that when the knife is closed, the leakage protector in the transformer power distribution room will trip (if there is no leakage protector, it will be quite dangerous, which will cause the motor to burn out). This is mainly due to the water in the pump body of the submersible pump, which causes the insulation resistance of the motor winding of the submersible pump to decrease, resulting in the action of the protector. At this time, use the R×10kΩ block of the shaker or multimeter to measure the motor winding to have a certain leakage resistance to the outer casing. The long-term use of the submersible pump causes severe wear of the mechanical seal end face, and the water penetrates thereby, soaking the motor winding to form a leakage. The removed submersible pump motor can be placed in a drying room or dried with a 100-200W incandescent bulb; the insulation resistance is measured to be infinite, then the mechanical seal is replaced, and the pump can be put into service.

The main reason for the increase in humidity in the workshop by the air cooler is the increase in absolute temperature and moisture content. For example, when the air is cooled from point A to point B, the moisture content is increased from 20 g/kg dry air to 23.5 g/kg dry air. The increase is small but must be controlled.

In semi-enclosed or fully enclosed plants, the moisture content will increase. Therefore, the cold air that is sent in must be exhausted by the exhaust air to quickly discharge the moisture content of the air into the room.

About the method of controlling the humidity of the air cooler

If the exhaust and air intake in the workshop are not parallel, the humidity in the plant will increase due to the increased moisture content in the plant. The exhaust and intake air will be installed in parallel, but the humidity in the plant will also be controlled.

Air discharge from enclosed plants is completely limited. It relies entirely on mechanical exhaust to vent air. The semi-enclosed plant needs to be equipped with an exhaust fan model, which can control the humidity of the air cooler.

For the fan, the most you hear is the negative pressure fan, but what other types? Today we will look at the classification of the fan, and what are the installation points.

What are the classifications of fans?

1, the fan can be divided into several types according to the use of materials, such as iron shell fan (common fan), fiberglass fan, plastic fan, aluminum fan, stainless steel fan, etc.

2. Fan classification can be divided into centrifugal type, axial flow type, diagonal flow type (mixed flow type) and cross flow type according to the direction of gas flow.

3. The fan is divided into: axial flow fan, centrifugal fan and diagonal flow (mixed flow) fan according to the flow direction of the airflow entering the impeller.

4. The fan is divided into a press-in type local fan (hereinafter referred to as a press-in fan) and an explosion-proof motor placed outside the flow channel or in the flow channel according to the purpose, and the explosion-proof motor is placed in the explosion-proof sealed cavity of the extraction type local fan (hereinafter referred to as extraction). Fan).

5. The fan can also be divided into single-stage, double-stage or multi-stage pressure fans according to the form of pressure. For example, 4-72 is a single-stage pressurization, and a high-end fan is a multi-stage pressurized fan.

6, the fan can be divided according to the purpose: axial fan, mixed flow fan, roof fan, air conditioning fan.

7. The fan can be divided into negative pressure fan, low pressure fan, medium pressure fan and high pressure fan according to pressure.

Negative pressure fan installation points

After purchasing a negative pressure fan, the problem is the installation problem. Let me introduce the installation points of the negative pressure fan. Yuyao air cooler, Cixi air cooler

1. If the fan is used in the process of using the inverter, the fan needs to be operated according to the requirements of the inverter to prevent the operation failure from affecting the service life.

2, although the installation of wind pressure fan is not very complicated, but we still recommend to find a professional installation staff, at least they know the hydropower installation knowledge, will not give you an accident during the installation process.

3. After the negative pressure fan is installed, it must be checked whether any tools or other items are left inside, so as not to affect its use. If some parts are too tight during the running process, it is recommended to turn off the power directly and solve the problem before continuing to use.

4. There should not be too many obstacles around the negative pressure fan, especially if there are too many obstacles within 3 meters. If there are too many obstacles, there will not be too much suction guarantee, which affects the ventilation. effect.

5. Before using the negative pressure fan for the first time, be sure to check that each component is intact. If a part is loose, it should be corrected before use. In the process of use, it is necessary to regularly check the integrity of each component, which can also increase the life of the fan.

6. The operation of the negative pressure fan needs to be in a relatively closed environment. The doors and windows on the same side are preferably closed, and the opposite doors and windows are preferably opened.

7. When installing the negative pressure fan, be sure to pay attention to its horizontal position to avoid tilting and affect its normal use.

8. The adjusting bolt must be in a convenient position, because in many cases, we must adjust the tightness of the belt as needed.

9. If the noise is too large during operation, such as the phenomenon of “beep” or vibration of the motor, stop the operation immediately and look for professional personnel to avoid damage to the negative pressure fan.

10. The wires around the negative pressure fan should preferably have a casing or a dark groove to ensure safety during use.

The type of fan and the installation points are introduced here. If you have any questions, please contact us.

What is the specificity of the industrial energy-saving fan in the air cooler? In the industrial industry, is the power of the chiller different? And, if the chiller is connected to three-phase electricity, how should we operate it? These three questions are related to the chiller, so let's give the specific answer immediately, so that everyone can fully grasp.

    Cooling fan power description and wiring treatment

    1. What is the specificity of the industrial energy-saving fan in the air cooler?

    For the industrial energy-saving fan in the chiller, it is a giant ceiling fan with a diameter of up to 7.3 meters. In the working principle, it is through the movement of air to generate a large amount of air, so that a certain airflow field is formed in a certain space, and then, the purpose of use such as ventilation and cooling is achieved.

    2. In the industrial industry, is the power of the chiller different?

    The cooling fan has a large or small power. Small words are a few hundred watts, usually a single phase 220V. In the case of a large one, it is about 1 kilowatt, and a three-phase motor is used. It should be noted that if the chiller is in the industrial sector, it is recommended to use three phases because it is better than single phase.

    3. If the chiller is connected to three-phase power, what is the specific?

    The air cooler, if it is connected to three-phase power, has three wires, one of which is a ground wire, which can be distinguished in color. Also, it is generally required to connect to a separate ground, but it depends on the specific situation. The other two are the zero line and the hot line. Therefore, everyone should make the correct connection and don't make a mistake.