At present, there are many kinds of pumping units in China. The most common one is the one with a large fan-shaped iron block seen on TV. It moves back and forth and becomes a "kowtow machine" vividly. However, the traditional kowtow machine has many problems, such as large starting impact, high power consumption, low efficiency and so on. In addition, the situation of oil wells is complex, such as heavy oil, wax deposition, sand card and so on. Rod breaking, motor burning and so on often occur, and the motor can not be well protected. Once there is a fault, the equipment maintenance is large. Due to the above reasons, it is necessary to improve the pumping equipment To carry out the transformation.
Lang drive inverter with asynchronous motor can speed regulation without pole, and has superior motor protection function, with over-current, overload, over-voltage, under voltage and stall, etc., and the acceleration and deceleration time can be adjusted, with soft start effect. The starting current is 1.1 ~ 1.3 times of the rated current, which can effectively protect the motor and mechanical equipment. It has motor self-learning function, accurate motor parameter identification, and provides electric power supply The running stability of the machine, using our inverter, its use effect is very obvious.
Pumping unit is a kind of mechanical equipment for oil exploitation. Kowtow pumping unit is a kind of traditional pumping equipment widely used in oil fields, which is usually directly driven by ordinary AC asynchronous motor. The crank belt drives the sucker rod with the counterweight balance weight, and drives the downhole oil pump to do a fixed cycle up and down reciprocating movement to send the downhole oil to the surface. In fact, the principle of pumping unit is the same as that of our own wells. Oil is pumped up through the swabbing action of a piston rod (sucker rod), and then sent away through buried pipelines. The difference is that the action of the pull rod is driven by a motor.
1. When the slider is lifted to the bottom of the well, the weight of the sucker rod will drop.
2. In the process of sliding block falling, due to the load reduction, the energy generated by motor driving has no place to discharge, which is bound to enter the regenerative power generation state, resulting in the increase of bus voltage in the main circuit. Frequent high-voltage impact will damage the main components of the inverter, including electrolytic capacitor and power module. Therefore, the braking circuit is added to release the regenerative voltage in time, so as to ensure the safe operation of the equipment Work under voltage. The frequency converter below 18.5kw has built-in brake unit, and the frequency converter above 18.5kw needs to purchase another brake unit.
