Asphalt heat pump no overload design technology used in different fields, play an important role in the industry and value, the following briefly introduce the use of asphalt heat pump in the industry, in accordance with the corresponding ways and means to ensure that asphalt insulation Pump in the use of the good value and role in the general centrifugal pump, the power is always increased with the flow rate increases, that is, the power curve is an increase with the flow of the curve, which is asphalt The use of a thermal pump poses a problem: when the pump is running at a design point, the power of the pump is less than the motor rated power, the use of this pump is safe; however, the flow increases as the pump head decreases Pump performance curve can be seen), the power also increases.When the flow rate exceeds the design point flow and reaches a certain value, the input power of the asphalt heat pump may exceed the rated power of the motor and cause the motor overload and burn. Run-time or to protect the system to stop the pump movement, or to protect the system failure to burn the motor. Asphalt heat pump head below the design point of use lift The situation is also often encountered in practice, a situation is in the pump selection, the pump head electoral too high, and the actual use of the pump is to reduce head use; the other case, in use Pump operating conditions are not well established, in other words, the flow of the pump needs to be adjusted frequently; there is another situation where the pump needs to be changed frequently, which can overload the pump and affect the reliability of the pump It can be said that the scope of application of pumps (including submersible sewage pumps) without full lift characteristics is greatly limited.The so-called full lift characteristic (also called no overload characteristic) means that the power curve increases with the flow rate The rate of increase is very slow, more desirably when the flow rate increases to a certain value, the power will not only rise again, but will decline, which means that the power curve is a hump curve, if so, As long as we choose to slightly exceed the motor rated power slightly higher than the value of the hump point, then in the entire range of 0 flow to the maximum flow, regardless of which operating point you run, the pump power will not exceed the motor power and overload the pump , To have this performance pump, both when the selection or use, will be very convenient and reliable. Also with motor power and need not be too large, it can save considerable cost of equipment.
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