Frequency control device from abroad in the late 1960s for submersible pumps for submersible pumps, the domestic pump industry from the early 1980s from the United States to import frequency control device. Frequency control device is not only used for submersible pumps, but also make constant speed submersible pumps become variable speed, high speed submersible pumps. Frequency control device can also be used for general fan, pump squirrel cage asynchronous motor speed. Advantages of submersible pumps 1 Improve the submersible pump flexibility and expand the scope of production, deep well production is always in its best condition, the situation is complicated and changing deep, requiring changes in submersible pump flow, lift, frequency control device can be achieved. Such as fluid viscosity increases, reduce the frequency to ensure that the motor is not overloaded. 2. To extend the life of the submersible pump Three-phase submersible motor to start all-voltage, starting current is about 4-6 times the rated current. Frequency conversion device can be used in low-frequency low-voltage start to achieve soft-start, starting current of about 1.5 times the rated current, greatly reducing the impact on the motor. In addition, when short-term overload, the frequency conversion device automatically down-frequency, reducing the number of downtime to start, which extend the submersible pump life 3. Reduce the number of maintenance, save down, start costs 4. Energy-saving submersible pumps in the best condition, energy consumption and production Fluid volume is proportional to variable speed submersible pump to solve the general low speed submersible pump flow, the problem of not reducing energy consumption, and with the gate valve, cut off the door compared to other methods estimated energy saving 20-30% 5 occasions must use variable frequency submersible pump Such as offshore oil production, especially test wells, gas field drainage gas (gas drainage gas production process is the main frequency conversion to improve speed, improve water vapor separation effect). Note submersible pumps and other geological conditions are unclear, well conditions change during operation. The advantages of high-speed submersible pump 1 submersible pump power is proportional to the power of the third power, increasing the frequency can greatly increase the flow or raise the head. This is particularly suitable for deep wells with high water content to increase the liquid volume, or the oil field due to deep wells need to greatly enhance the lift case 2. If the submersible pump power remains unchanged, increasing the frequency will reduce motor and submersible pump size and reduce costs, Compact structure with higher efficiency and reliability If the frequency is increased from 50Hz to 100Hz, the theoretical motor volume is reduced by 1/2 and the submersible pump volume is reduced by 3/4 (how to distinguish the inverter from the high speed submersible pump)
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