Asphalt heat pump in use in the specific circumstances
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 burned. Run-time or to protect the system to stop the pump movement, or to protect the system failure to burn the motor. Pitch insulation pump head below the design point of use lift The situation is also often encountered in practice, a situation is the pump selection, the pump lift election too high, but the actual use of the pump is to reduce the use of head; the other is that the use of In the pump operating conditions are not very good OK, in other words, the pump flow needs to be adjusted frequently; there is a case where the pump needs to be changed frequently. These three situations may cause overloading of the pump and affect the reliability of the pump It can be said that, for the pump without full lift characteristics (including submersible sewage pump), its use range will be greatly limited.The so-called full lift characteristic (also known as no overload characteristics) refers to the power curve with the flow Increasing and increasing very slowly, more desirable when the flow increases to a certain value, the power will not only not rise, but will decline, that is, the power curve is a hump curve, if so , We only choose to motor rated power slightly more than the hump point power value, then the flow of 0 to the maximum flow of the entire range, no matter in which operating point you run, the pump power will not exceed the motor power and the pump Too For pump with this kind of performance, it is very convenient and reliable to choose and use the pump.Otherwise, the motor power need not be allocated too large, which can save considerable equipment cost.
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