The problem of pipe blockage at the outlet of the fan, the blockage of the material pipe at the back

In the work of the fan, there is a pressure head corresponding to a flow rate, which is divided into full pressure and static pressure, full pressure = static pressure + dynamic pressure, dynamic pressure is related to the size of the flow rate, and the static pressure is used to overcome the resistance of the pipeline. If the pipe is thin and long, the resistance is large, and the static pressure of the fan is also large, so the small diameter of the pipe and the small pressure head of the fan are actually related to each other, because the diameter of the pipe is small, the resistance is large, so the fan pressure head selected is not enough. (The resistance of the pipe can be calculated in a ventilation manual, and the resistance of the pipe is proportional to the length of the pipe, inversely proportional to the diameter of the pipe, and proportional to the square of the flow velocity.)

If the fan pressure head is not enough to overcome the pipe resistance under the rated flow rate, then the flow rate of the fan will automatically decrease, the flow rate of the fan will decrease, the flow rate of the wind in the pipe will be small, and the dust will not be easy to take away. There will be a "blockage".

To solve this problem, increasing the speed is one way, but it is necessary to consider how much power margin the motor has and whether the motor will be overloaded. Because the flow, indenter and power corresponding to the increase of speed will increase, the flow, indenter and power are in the primary, quadratic and cubic relationship with the speed respectively.

If there is always this problem after the fan is installed, it means that the original fan pressure head is low. If it is a phenomenon that occurs later, two situations cannot be ruled out:1

The resistance of the pipe has increased, most of the time it is due to the blockage (or fouling of the pipe wall) in the pipe, it is recommended to clean the pipe, including the pipe at the inlet of the fan;2.The function of the fan itself has decreased, and only the speed of the fan has been reduced when the fan is not damaged, so it is recommended to check whether the V-belt is too loose and whether the input voltage of the motor is low.

If you reduce the fan pulley and increase the fan speed, the problem will be solved. Marriott Mechanics Apprentice.

The model of the fan you use should be said.

It depends on what you mean by the axial fan.

The power of the equipped fan is insufficient, and the insufficient wind pressure is the reason why the fan is easy to block.

Due to the unobstructed outlet of the fan, the wind is not passable, the pressure increases, and the motor forms an overload surge, which causes the pipe to be blocked.

The outlet is blocked, and the pressure becomes less. Finally, the fan idles, there is no protection device, and the motor is burned.

The pipe is blocked, the fan outlet is unstable, the wind is not extinguished, the pressure rises, and the motor causes overpressure and overload, which causes the roots blower ammeter to rise.

As long as the fan impeller is rotating, the air flow will flow in one direction under pressure.

If the axial fan is installed in the correct direction, but there is exhaust fan inlet and inlet fan exhaust, there is only one reason: the fan is reversed!

The solution can be solved by simply jumping the line.

If the installation direction is wrong, the actual air intake or exhaust volume will be greatly reduced, even though it can be operated in reverse.

See if the fan is reversed.

What do you mean! Blocked duct in the back? After all the blockages, there is no wind.

Cleaning Method:

1. Sterilization and algae: add fungicide to remove all kinds of bacteria and algae in the water system.

2. Slime stripping: add stripping agent to peel off the slime generated on the inner wall of the pipeline, and clean the slime out through circulation.

3. Chemical cleaning: add chemical cleaning agent and dispersant to clean the rust, scale and oil stains on the inner wall of the pipeline.

4. Surface pre-filming: Inject pre-coating agent into the water system to form a dense polymer protective film on the metal surface to prevent corrosion.

5. Add corrosion inhibitor: avoid rust on the inner wall of the pipeline, and add antiscalant to prevent scaling of calcium and magnesium ions.

Several steps for fan coil unit cleaning:

1. Remove the dirt and impurities in the stagnant water tray to avoid the blockage of the condensate pipeline.

2. Dismantle the fan, spray it with clean water on the inner wall of the fan impeller and volute, and then evenly spray the dust removal cleaning agent and rinse it with water after placing it for 10-15 minutes.

3. To clean the fins, first wet the fins with clean water, then spray the fins evenly with a watering can to spray the special cleaning agent evenly to the fins, and rinse the fins with a high-pressure cleaning gun after 10-15 minutes.

4. Take off the return air filter and rinse the dust attached to the mesh with clean water.

5. Use a high-pressure air pump to blow off the dust on the surface of the air outlet.

No, it won't. The blockage of the air outlet of the centrifugal fan will make the flow rate close to 0, and the static pressure at the air outlet is the largest, but the dynamic pressure is almost 0. It won't make a difference for a short time. And if the temperature rises, it is also the temperature of the motor, and the temperature of the pipe will hardly change.

The cold storage door is opened too often, there is always outside air entering the cold storage, and the fan will freeze when it encounters cold!

The cold storage air cooler defrost sensor is behind the air cooler. The goods stored in the cold storage are different, the humidity in the cold storage is different, and the amount of frost on the air cooler is also different, so the defrosting value should be set according to the different goods put into the cold room. In order to achieve the purpose of the node, the cold storage management personnel should often observe the frosting and defrosting of the air cooler, and adjust the defrosting cycle and defrosting time according to the defrosting situation of the air cooler, so that the defrosting can be completely clean during the period, and the storage temperature will not rise too much.

After the air cooler enters the automatic frost program, the power supply cannot be turned off at this time, otherwise the defrosting program will not be carried out; In addition, regularly check the smoothness of the defrosting water pipe to ensure that the defrosting water is transferred out in time. If there is too much frost in the fan coil unit, forced defrosting can be performed, and forced defrosting can be performed manually for defrosting.