Application of asphalt insulation pump in various industries
2020/08/05 17:28:30
In a general centrifugal oil pump, the power always increases with the increase of the flow, that is to say, the power curve is a curve that rises with the increase of the flow, which will bring a problem to the use of the asphalt insulation pump: When the pump is operating at the design operating point, the power of the pump is less than the rated power of the motor, and the use of this pump is safe; but when the pump head is reduced, the flow rate will increase (as can be seen from the performance curve of the pump), and the power is also Increase with it. When the flow exceeds the design operating point flow and reaches a certain value, the input power of the asphalt insulation pump may exceed the rated power of the motor and cause the motor to overload and burn. When the motor is overloaded, either the protection system acts to stop the pump; or the protection system fails and the motor burns.
The head of the asphalt Jacketed pump is lower than the head of the design operating point. It is often encountered in practice. One situation is that the pump head is selected too high when the pump is selected, and the pump is actually used. It is used to reduce the head; another situation is that the working condition of the pump is not very well determined during use, in other words the flow of the pump needs to be adjusted frequently; there is another situation that the pump needs to be used frequently in changing locations. These three conditions may overload the pump and affect its reliability. It can be said that for pumps without full-head characteristics (including submersible sewage pumps), their use range will be largely restricted.
The so-called full-head characteristic (also known as no-overload characteristic) means that the power curve rises very slowly with the increase in flow rate. More ideally, when the flow rate increases to a certain value, the power will not rise again, but will be somewhat Decrease, that is to say, the power curve is a curve with a hump. If this is the case, we only need to choose the power value of the motor rated power slightly exceeding the hump point, then in the entire range from 0 flow to maximum flow, no matter which one you are in Running at the operating point, the power of the pump will not exceed the power of the motor and overload the pump. For a pump with this performance, whether it is selection or use, it will be very convenient and reliable. In addition, the motor power does not need to be too large, which can save considerable equipment costs.
