Plural equilibrium formula long stroke pumping unit
The invention belongs to the mechanical oil recovery equip ment technical field, particularly a kind of plural equilibrium formula long stroke pumping unit.
In technique known, the normally used beam pumping unit in oil field, bulky, energy consumption is high, load performance is poor because of its reasons in structure, especially be difficult for realizing long stroke.Therefore, long stroke, low jig frequency, big discharge capacity, heavy duty oil pumper are the research topics of domestic and international oil production equipment always.Got into since 21 century, developed various blue elephants both at home and abroad in succession, turn to reversible motor or hydraulic motor to drive the cylinder rotating, realize the long stroke oil pumping like employing; Adopt six bar linkage structures to increase the stroke of walking beam machine; Utilize assembly pulley and the gear-driven journey mode or the like that increases.Though all obtained beneficial effect in various degree.But, because oil pumper is not have the operation of keeping an eye on continuously in the complicated field of geography and climate, require oil pumper simple in structure, sturdy, reliable, be convenient to maintenance.Therefore, the defective of the equal various degrees of such scheme, as: complex structure, poor reliability, not sturdy, maintenance management is inconvenient, counterbalance effect is poor, power consumption is big, it is many etc. to consume steel.In existing technology; Also disclose a kind of head sheave type and do not had the walking beam stroke increased oil pumping machine;, good balance effect energy-conservation, the characteristics such as long stroke that are prone to realize with it; Progressively get into the oilfield exploitation operation; And in oil production equipment, be used as new architecture with development potentiality and popularizing application prospect; This machine is to drive the roller bearing travel prolongation mechanism by the double-crank double connecting rod to promote the head sheave swing, and pumps through the drive of the wire rope on head sheave sucker rod, realizes the long stroke operation.But it is many that this machine increases journey componental movement member, and structure is comparatively complicated, and stressed big, easy damage, and poor reliability, the while, manufacturing and operational administrative difficulty were big because commutation driving and travel prolongation mechanism are arranged on the top of frame, and on-the-spot installation and maintenance are difficult.Secondly, adopt double-crank double link structure, form price scissors easily, and connecting rod is longer, the material and the accuracy of manufacture of connecting rod are had relatively high expectations, give and make, install and all bring bigger difficulty, increased the weight of complete machine, strengthened manufacturing cost.They are three years old; The balance sysmte of this machine adopts freely-suspended mode; Though counterbalance effect is preferably arranged; But rely on head sheave to carry out transmission simultaneously with relative stiction between the wire rope; Under big loaded-up condition, particularly when starting or brake, its reliable transmission property is poor; Cause the tired and wearing and tearing of wire rope easily, application life is short.Its four, balance weight is in free suspension status, the high-altitude up and down, when the sucker rod suspended end occur to lose was carried, the balance weight of several tons of weights fell from the high-altitude suddenly, and support is caused powerful impact, and the great whipping of wire rope also is prone to lead to a disaster.
Summary of the invention
The object of the present invention is to provide a kind of simple in structure, moving link is few, in light weight, good balance effect, energy-conservation province material, easy to adjust, and realizes the plural equilibrium formula long stroke pumping unit of long stroke easily.
Realize that the technical scheme that the object of the invention adopted is: this oil pumper has base and frame; Be provided with power transmission shaft through support on the base; This power transmission shaft is connected with frame through axle bed; One end of power transmission shaft is connected with the outstanding rope of train mechanism through the belt transmission part; The other end is connected with the commutation driving mechanism; The middle part is provided with combined balance mechanism; Said commutation driving mechanism is by drive motors; Driving shaft; Connecting rod is formed with a pair of crank throw that is connected with connecting rod; Drive motors is installed on the base; And be connected with driving shaft through driving member; Driving shaft is installed with base through supporting seat and is connected, and two crank throws are fixedly connected with power transmission shaft with driving shaft respectively.
The outstanding rope of said train mechanism is made up of rope-winding wheel, outstanding rope and top block; Rope-winding wheel is installed on the frame through wheel shaft; The other end of wheel shaft is connected with power transmission shaft through said belt transmission part; Top block is installed in the top of frame; One end of outstanding rope is fixed on the rope-winding wheel, and the other end is walked around top block and is connected with sucker rod.
Said combined balance mechanism is made up of balance weight suspension sheave and shifting balance assembly; The balance weight suspension sheave fixedly is installed on the power transmission shaft; And rotate with power transmission shaft; Be hung with balance weight through wire rope on the balance weight suspension sheave; Said shifting balance assembly comprises chute; Balance relay bar and adjusting gag lever post; Wherein, Be provided with the balance rolling member in the chute; The chute bottom installs with power transmission shaft through Connection Block and is connected; And can relative free transmission with power transmission shaft; Regulate the free end that gag lever post is connected balance relay bar, be coated with on it; The lower limit block piece, balance relay bar is fixedly connected with power transmission shaft.
Said balance rolling member adopts balance roller or spin.
Said drive motors adopts frequency control motor.
Plural equilibrium formula long stroke pumping unit of the present invention; Through the combined balance structure, can alleviate the weight of balance weight greatly, and the coefficient of balance of oil pumper is brought up to more than 90%; Thereby can reduce the peak torque of reducer output shaft, increase the hoisting power of oil pumper.Compare with beam pumping unit, the complete machine weight of this machine is lighter, and necessary electromotor rated power is little, consumes steel and can practice thrift more than 35%, and the energy consumption of use can reduce more than 50%.Simultaneously, stroke, jig frequency are adjusted easy, need not change mechanism's preparation, and different oil well situations and variation thereof are had the bigger scope of application.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the right view of Fig. 1.
The specific embodiment
Referring to Fig. 1, Fig. 2, plural equilibrium formula long stroke pumping unit of the present invention has base 1 and frame 2, is provided with power transmission shaft 6 through support 13 on the base 1, and this power transmission shaft 6 is connected with frame 2 through axle bed 22.One end of power transmission shaft 6 is connected with the outstanding rope of train mechanism through belt transmission part 23, and the other end is connected with the commutation driving mechanism, and the middle part is provided with combined balance mechanism.Said commutation driving mechanism is made up of drive motors 7, driving member 8, driving shaft 9, connecting rod 12 and a pair of crank throw 11,14 that is connected with connecting rod 12; Drive motors 7 is installed on the base 1; And be connected with driving shaft 9 through driving member 8; Driving shaft 9 is installed with base 1 through supporting seat 10 and is connected, and two crank throws 11,14 are fixedly connected with power transmission shaft 6 with driving shaft 9 respectively.Drive motors 7 adopts frequency control motor, the jig frequency that can regulate oil pumper easily, and the scalable oil pumper starts and the normal size variation of moving demand power under the two states, reduces to mate the rated power of drive motors 7.The outstanding rope of said train mechanism is made up of rope-winding wheel 5, outstanding rope 19 and top block 20; Rope-winding wheel 5 is installed on the frame 2 through wheel shaft 24; The other end of wheel shaft 24 is connected with power transmission shaft 6 through said belt transmission part 23; Top block 20 is installed in the top of frame 2 through bearing support 21; One end of outstanding rope 19 is fixed on the rope-winding wheel 5; It is free sagging that the other end is walked around top block 20, is used to connect sucker rod.Said combined balance mechanism is made up of with shifting balance mechanism balance weight suspension sheave 18, and balance weight suspension sheave 18 fixedly is installed on the power transmission shaft 6, and with power transmission shaft 6 rotations, is hung with balance weight 3 through wire rope 4 on the balance weight suspension sheave 18.Shifting balance mechanism comprises chute 16, balance relay bar 15 and regulates gag lever post 27; Wherein, Be provided with balance rolling member 26 in the chute 16; Can in chute 16, move freely; Balance rolling member 26 can adopt balance roller or spin; The bottom of chute 16 installs with power transmission shaft 6 through Connection Block 17 and is connected, and can with power transmission shaft 6 relative free transmissions.Regulate the free end that gag lever post 27 is connected balance relay bar 15, be coated with upper and lower spacing block piece 28,29 on it, balance relay bar 15 is fixedly connected with power transmission shaft 6, is used to accept the control at balancing gravity and chute 16 inclination angles.On base 1, be provided with braking mechanism 25, this braking mechanism 25 is arranged on a side of said belt transmission part 23, and its structure adopts conventional braking mechanism, repeats no more.
Operating principle: this oil pumper in use when drive motors 7 rotations, drives power transmission shaft 6 positive and negative rotations through driving shaft 9 and crank throw 11,14, connecting rod 12, and moves up and down through belt transmission part 23 and the free end that rope-winding wheel 5 drives outstanding rope 19.In power transmission shaft 6 positive and negative rotating process, outstanding rope load receives the balance that produces reactive torque under balance weight 3 actions of gravity all the time through the moment of torsion transmission of power transmission shaft 6.Simultaneously; In the process of outstanding rope 19 free end up strokes, balance rolling member 26 is in the end of chute 16 away from power transmission shaft 6, and by its gravity chute 16 bottoms is contacted with balance relay bar 15; On power transmission shaft 6, produce the load reversal moment of torsion, reduce the load power of drive motors 7 with this; When the free end stroke of outstanding rope 19 commutates to down stroke; Under the effect of balance relay bar 15 upper limit block pieces 28,29; Make chute 16 conversion incline directions; Balance rolling member 26 is rolled into chute 16 naturally apart from the nearer end of power transmission shaft 6; The gravity of balance rolling member 26 is through the center of power transmission shaft 6 at this moment, and balance rolling member 26 is no longer brought into play balanced action.Plural equilibrium through hanging balancing piece 3 and balance rolling member 26 move can make the coefficient of balance of oil pumper reach more than 90%, can reduce the rated power of this oil pumper coupling drive motors 7 thus greatly, saves power consumption to greatest extent.When needs adjustment changed the stroke of oil pumper, one or two belt pulley that only needs to change in different rope-winding wheel 5 of size diameter or the replacing belt transmission part 23 got final product.When needs are adjusted the jig frequency number of times of oil pumper, only need the rotating speed of adjustment drive motors 7 to realize, operate very simple.This oil pumper alleviates complete machine weight greatly because the raising of coefficient of balance not only can significantly reduce power consumption, and make complete machine structure simpler, reduces manufacturing cost.