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Ac fan motor for outdoor air source heat pump manufacturer will show you the difference between fan surge and stall

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Ac fan motor for outdoor air source heat pump manufacturer will show you the difference between fan surge and stall

  • Categories:Industry News
  • Author:
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  • Time of issue:2021-09-07
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(Summary description)The manufacturer of Ac fan motor for outdoor air source heat pump tells you that when the fan is running in an unstable working area.

Ac fan motor for outdoor air source heat pump manufacturer will show you the difference between fan surge and stall

(Summary description)The manufacturer of Ac fan motor for outdoor air source heat pump tells you that when the fan is running in an unstable working area.

  • Categories:Industry News
  • Author:
  • Origin:
  • Time of issue:2021-09-07
  • Views:0
Information

The manufacturer of Ac fan motor for outdoor air source heat pump tells you that when the fan is running in an unstable working area, large fluctuations in the total pressure of the flow may occur, causing periodic and severe vibrations of the fan and piping system, accompanied by strong Noise, this phenomenon is called surge. The manufacturer of Ac fan motor for outdoor air source heat pump tells you that the fan will surging only under the following conditions:

Cheapest Ac fan motor for outdoor air source heat pump supplier(s)
1. The fan runs in an unstable working area, and the fan's operating point falls on the rising section of the performance curve.
2. The piping system of the fan has a larger volume and forms a flexible aerodynamic system with the fan.
3. The periodic fluctuation frequency of the air flow in the system is in sync with the frequency of the entire cycle of the fan's work, resulting in resonance.
The manufacturer of Ac fan motor for outdoor air source heat pump tells you that when fans are running in parallel, one fan may have a particularly large flow rate, while the other fan may have a particularly small flow rate. If you adjust it slightly, the situation may be just the opposite. The original flow rate The larger one decreases. The manufacturer of Ac fan motor for outdoor air source heat pump tells you that this is repeated so that it cannot run in parallel. This phenomenon is called wind rush phenomenon.
From the analysis of the fan performance curve: when fans with a saddle-shaped performance curve are operated in parallel, the phenomenon of "wind grabbing" may occur.
The so-called rush of wind means that the current (flow) of one fan increases suddenly and the current (flow) of one fan decreases when two fans operate in parallel. At this time, if the adjusting damper of the small and large-flow fan is closed to try to balance the air volume, another small-flow fan will jump to the maximum flow operation. The manufacturer of Ac fan motor for outdoor air source heat pump tells you that when adjusting the automatic dampers, the moving blades or static blades of the fan frequently open and close, which may cause the fan motor to overcurrent and burn out in severe cases.
In order to avoid the wind rush phenomenon of the fan, it can be operated in a single unit when the load is low. When the operation of a single fan cannot meet the needs, the second unit can be started to participate in parallel operation.
The manufacturer of Ac fan motor for outdoor air source heat pump tells you that when the angle of attack increases to a certain critical value, the flow of fluid on the convex surface of the blade is destroyed, the boundary layer is severely separated, the resistance is greatly increased, and the lift is sharply reduced. This phenomenon is called stall or stall.
The manufacturer of Ac fan motor for outdoor air source heat pump tells you that on the impeller cascade, the flow of fluid around each blade cannot be exactly the same, so it is impossible for the outflow to occur on each blade at the same time. The manufacturer of Ac fan motor for outdoor air source heat pump tells you that once one or some of the blades first produce outflow, the outflow will spread across the entire blade cascade one by one. This phenomenon is called spin-off.

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