CN1122878A - Sliding beam type digital control electric equilibrium device for oil extraction pump - Google Patents

Abstract

Rare-earth permanent-magnet full speed motor is used as energy converter mounted on another side of active belt pulley driven by its drive motor, bidirection variable-frequency inverter or control switch is externally connected to the stator coil of the rare-earth motor, and this inverter is further connected to the grid for realization. The rare-earth motor is connected with the drive motor into one organic entirety by means of a coupler. This device not only in case of insufficient driving power, can obtain energy from the power grid by means of rare-earth motor through bidirection variable-frequency inverter to produce the aided power drive with controllable rotating speed, rotation direction, torque and stroke, but also can transform potential energy into electric energy to feed back the power grid during the down-stroke of beam-pumping unit.

Description

The numerical control electric equilibrium device of beam pumping unit

The present invention relates to a kind of annex of numerically controlled beam-pumping unit, the electric equilibrium device of numerically controlled beam-pumping unit just belongs to the petroleum production field of mechanical technique of electromechanical integration

Beam pumping unit is the tradition oil pumping mechanical device that China's oil field using scope is the most extensive, the time is the longest.Because it is firm in structure firm and solid, do not need the personal management, can adapt under the harsh in the open air operating conditions and work long hours, so be still the fresh combatants of oilfield exploitation so far.Because viscous crude and deep mining task are heavy day by day in China oil field, make the equilibrium problem of just quite sharp-pointed pumping unit power of original contradiction and load more outstanding, although adopted multiple comprehensive mechanical balanced measure, beam balance for example, crank balance, cylinder balancing etc., and adopt big horse to drag the power setting of dolly, still can not make the power of pumping unit reach balanced, increase several times (for thick matter oil well even reach its load at the most suddenly, also can great changes will take place with the crude oil viscosity in a bite oil well) time, also can keep normal operation and produce, be appreciable as for the loss consumption aspect of energy.Although the actual power that consumes when for example the drive motor rated power of Pei Beiing is than oil pumping is much bigger, but because the efficient low (usually between 0.3～0.6) of beam pumping unit, and the operating conditions of motor is away from design point, in case when running into heavy crude producing, the sense of still can be short of power " unable to do what one wishes ".The load condition of beam pumping unit in some operation period is extremely complicated, in fact the energy of importing from electrical network when the walking beam up stroke has only sub-fraction to be used for promoting the crude oil acting, and most energy are used to the moving element of lift device itself; And when the down stroke, this part potential energy does not discharge work done yet and has consumed in vain with the form of heating.In order to improve above-mentioned condition, beam pumping unit has been taked various balance of machinery measures, but these balanced measures all will be subjected to the restriction of mechanical structure, counterbalance effect is unsatisfactory, and, because the existence and the influence of these equalizing features make the stressing conditions of member become complicated more, equipment damages easily.

The purpose of this invention is to provide the numerical control electric equilibrium device that uses on a kind of beam pumping unit.

The present invention is achieved in that including its rotor outer rim is equipped with the rare earth full speed synchronous machine that rare earth permanent-magnetic material is made a plurality of magnetic poles, shaft joint and numerical control device, it is characterized in that: the opposite side of the drive pulley that drives at the drive motor of beam pumping unit is equipped with as the rare earth permanent magnet of transducer motor at full speed, this motor joins together by elastic coupling flexible coupling and drive pulley, this motor links to each other with power supply network by control switch or the external two-way variable ratio frequency changer inverter of its stator coil.

The present invention is the patented technology the claimant: " numerical control full speed rare-earth synchronous motor " is that transmission device with beam pumping unit combines with above-mentioned patented technology and the novel numerical control electric equilibrium technical equipment that produces (CN91203427.0) and " NC full-speed electric power/power device " through simplifying (CN93200001.0) recreation on the basis.The present invention be utilize that contemporary high and new technology equipment and power supply network constitute can be by the numerical control device Equilibrator of control in real time at random, make pumping unit and electrical network be linked to be the organic whole of a controlled exchange energy and balanced power: when the pumping unit up stroke is pumped, to obtain the energy acting from electrical network by drive motor; When its down stroke, the potential energy that the pumping unit moving element is possessed transforms electric energy by numerical control rare earth full speed synchronous machine again and presents back power supply network, thereby improves beam pumping unit working efficiency and capacity usage ratio greatly; In case run into the special viscous of viscous crude, during drive motor " unable to do what one wishes ", the rare-earth synchronous motor of this transducer also can obtain the energy from electrical network, assists drive motor to exert oneself together and drives the drive pulley rotation, make pumping unit power performance, energy consumption and power supply quality can both be improved significantly.The present invention simultaneously can replace traditional various mechanical equilibrators again, and the mechanical structure of beam pumping unit is simplified more; Moreover, after pumping unit is installed the present invention, and be provided with its agent structure of change and traditional using method, help applying this invention.

Fig. 1 is that structure of the present invention is formed schematic representation.

Referring to Fig. 1, the present invention be exactly the opposite side of the drive pulley 2 that drives of the drive motor 1 at former pumping unit install its rotor outer rim be equipped with rare earth that rare earth permanent magnet tree material makes a plurality of magnetic poles at full speed synchronous machine 3 as transducer of the present invention, this rare-earth synchronous motor 3 is formed an integral body by the coaxial elastic coupling flexible coupling 4 that is installed on the drive pulley 2 with drive motor 1, the stator coil of rare-earth electric motor 3 is circumscribed with two-way variable ratio frequency changer inverter 5, this inverter 5 links to each other with power supply network 6 again, and its stator coil is linked to each other with power supply network 6 by control switch

After beam pumping unit is installed the present invention, its main body mechanical structure and using method there is no very and change, still by drive motor 1 as main power source, drive pulley 2 rotations, and make by wire rope, hoisting mechanism under the usual condition that pumps of sucker rod do suction crude oil, during the sucker rod up stroke, drive motor 1 absorbs the electric energy work done from electrical network, in case of necessity, but the rare earth of transducer also feed-in electric energy of motor 3 at full speed collaboratively increases the moment of torsion work done.And when after sucker rod arrives the summit, moving downward, it is original that the potential energy of loss can be by driving mechanism and belt pulley 2 in vain, make the rotor rotation of rare-earth permanent-magnet electric machine 3, and the electric energy that induction on its stator coil generates is presented back power supply network 6 through two-way variable ratio frequency changer inverter 5.This two-way variable ratio frequency changer inverter 5 both can convert the Ac from the electrical network input to frequency, phase place, but electric current is the Ac feed-in rare earth full speed synchronous machine 3 of randomly changing all, control its rotating speed, turn to, output torque and stroke, exert oneself from underground extraction viscous crude to assist drive motor 1, also rare-earth permanent-magnet electric machine can be drawn at the electromotive force that the time induction of pumping unit down stroke generates, and make it with synchronized after the feed-in power supply network, the energy consumption of pumping unit and dynamical balancing are improved at all.

Because as the rare earth of the transducer premium properties of synchronous machine at full speed, can make the balance of machinery facility of former beam pumping unit become unnecessary and can simplify it, thereby simplify the mechanical structure of pumping unit, and the energy consumption of saving the oil field greatly.Measuring and calculating according to statistics; 50,000 of the existing beam pumping units of China; if can both use apparatus of the present invention instead; 2,000,000,000 degree can economize on electricity in 1 year; country can reduce consumption raw coal 700,000 every year rams the loose soil with a stone-roller after sowing, and reduces simultaneously to 150 tons of airborne release greenhouse gases, has both saved primary energy; be of value to environmental protection again, economic benefit and social benefit are all quite remarkable.

Claims (1)

1, a kind of numerical control electric equilibrium device of beam pumping unit, include its rotor outer rim rare earth full speed synchronous machine, shaft joint and the numerical control device that rare earth permanent-magnetic material is made a plurality of magnetic poles is housed, it is characterized in that: the opposite side of the drive pulley that drives at the drive motor of beam pumping unit is equipped with as the rare earth permanent magnet of transducer motor at full speed, this motor joins together by elastic coupling flexible coupling and drive pulley, this motor links to each other with power supply network by control switch or its by control switch or the external two-way variable ratio frequency changer inverter of its stator coil.

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