Why should the boiler feed pump be equipped with hydraulic coupler?

Boiler feed pump consists of multiple parts, of which the boiler feed pump hydraulic coupler is an important part of its operation in the boiler feed pump plays an important role. Hydraulic coupler mainly by the pump wheel, turbine and rotating jacket and the composition of these parts, each part has its own role.
 Boiler feed pump with hydraulic coupler reasons:
    1, simplify the water supply console, improve the boiler water supply system to run the reliability.
    2, the unit to participate in FM, peaking, often under low load operation, the use of hydraulic coupling speed, compared with the throttle adjustment, the pump power consumption can be significantly reduced.
    3, the use of speed to the pump, the simplified water supply console and operation switching steps for the boiler to achieve full adjustment of the water supply to create a good condition.
    4, to facilitate the host group of sliding operation.
    5, speed pump start convenient, because it can start at low speed, so the speed of the process is stable, the impact of small current.
    Under normal circumstances is not with a hydraulic coupler, unless the user requires the frequency conversion will choose the hydraulic coupler to achieve FM.
The hydraulic coupling has the following advantages:
    1, stepless speed, the input speed in the case of the same, you can output continuous, stepless speed.
    2, work smoothly, you can start smoothly, accelerate, slow down, stop.
    3, no-load start, the motor can not load or light load start, it can choose the most economical motor and electronic control equipment, reduce the starting current, saving energy.
    4, isolation vibration, hydraulic coupling between the pump wheel and the turbine is not mechanical contact, torque through the working fluid transmission, is a flexible connection. When the active shaft has periodic vibration (such as torsional vibration), will not reach the driven shaft, with good vibration isolation effect, can reduce the impact load, extend the motor and pump and fan mechanical life.
    5, overload protection, because the hydraulic coupling is a flexible drive, the pump wheel and the turbine between the speed difference, so when the resistance of the driven shaft suddenly increased, the slip increases, and even brake, and the prime mover still Can continue to run, without burning, pumps and fans can also be protected.
    6, no mechanical wear, because the pump wheel and the turbine without direct mechanical contact, so reliable, long-term maintenance without maintenance, long life.
    7, easy to control, hydraulic coupling is stepless speed regulation, it is easy to achieve automatic control, suitable for the servo system control.
    8, energy saving, compared with the valve throttling adjustment, energy saving effect is remarkable.
    The hydraulic coupling has the following drawbacks:
    1, in the case of lower rated motor speed, the same torque in the use of a smaller speed, the hydraulic coupling of the working chamber diameter will increase, that is, the size and quality of the hydraulic coupling will be a corresponding increase, This will not only increase the cost, but also will increase the delay time of the hydraulic coupling speed, not suited to deal with the requirements of emergency.
    2, for high-power hydraulic coupling, in addition to the body but also have a set of pumps, coolers, fuel tanks and other ancillary equipment and piping systems, so the equipment is complicated.
    3, in the operation with the load changes, the speed ratio is also a corresponding change, it is impossible to have a precise speed ratio, the hydraulic coupling in the event of failure, pump and fan can not continue to work.

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