CN203239662U - Power unit of hydraulic pumping unit and corresponding hydraulic pumping unit - Google Patents

Power unit of hydraulic pumping unit and corresponding hydraulic pumping unit Download PDF

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Publication number
CN203239662U
CN203239662U CN 201320255496 CN201320255496U CN203239662U CN 203239662 U CN203239662 U CN 203239662U CN 201320255496 CN201320255496 CN 201320255496 CN 201320255496 U CN201320255496 U CN 201320255496U CN 203239662 U CN203239662 U CN 203239662U
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CN
China
Prior art keywords
unit
hydraulic
sucker rod
control
pump
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Withdrawn - After Issue
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CN 201320255496
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Chinese (zh)
Inventor
雷正忠
孙培
陈永伯
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Bosch Rexroth Changzhou Co Ltd
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Bosch Rexroth Changzhou Co Ltd
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Priority to CN 201320255496 priority Critical patent/CN203239662U/en
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Abstract

The utility model discloses a power unit of a hydraulic pumping unit. The power unit of the hydraulic pumping unit comprises a motor, a pumping rod driving device, a variable pump, a secondary hydraulic controlling unit, an energy accumulator, a sensor, a first controlling device and a second controlling device. The pumping rod driving device is used for driving a pumping rod to reciprocate, and the variable pump is driven by the motor and connected to the pumping rod driving device in a hydraulic mode. The secondary hydraulic controlling unit is connected to the pumping rod driving device in a hydraulic mode. The energy accumulator is connected to the secondary hydraulic controlling unit in a transmission mode. The sensor is used for setting stroke of the pumping rod. The first controlling device is based on the signals of the sensor to enable the discharge capacity of the variable pump to be zero during the declining process of the pumping rod and enables the discharge capacity of the variable pump to be a positive number during the ascending process of the pumping rod to drive the pumping rod driving device. The second controlling device is based on the signals of the sensor to enable the secondary controlling hydraulic unit to be used as a motor driving energy accumulator to store energy during the descending process of the pumping rod and is driven by the energy accumulator to be used as a pump to drive the pumping rod driving device during the ascending process of the pumping rod. The utility model further discloses a corresponding hydraulic pumping unit. The hydraulic pumping unit has high energy circulating utilization rate and is simple and reliable.

Description

The power unit of hydraulic oil pumping unit and corresponding hydraulic oil pumping unit
Technical field
The utility model relates to a kind of oil production equipment, particularly relates to a kind of power unit and a kind of hydraulic oil pumping unit that comprises this power unit of hydraulic oil pumping unit.
Background technique
In present oil recovery process, no matter be in default of internal pressure or other reasons, if can not naturally flow out crude oil from producing well, then must seek a kind of " manual method ", now the most frequently used is exactly beam pumping unit, is commonly referred to as " machine of kowtowing ".Beam pumping unit mainly is comprised of walking beam-connecting rod-crank mechanism, speed reducer, threephase asynchronous machine and auxiliary equipment etc.During oil recovery, overall efficiency is lower, and power factor is smaller, and power consumption is high.And this beam pumping unit is bulky, and energy-saving efficiency is low, and cost is high, yield poorly, and installation and maintenance inconvenience.
For this reason, Chinese patent CN202181885U discloses a kind of hydraulic oil pumping unit, it has the linear quadratic control hydraulic unit, by linear quadratic control hydraulic unit control so drive the reciprocating oil cylinder of sucker rod, be used for setting the sensor of the stroke of cylinder piston rod (that is, sucker rod), the asynchronous motor that is in transmission connection with the linear quadratic control hydraulic unit, the potential energy accumulator (preferably adopting the form of flywheel) that is connected with induction motor drive and based on the SC sigmal control linear quadratic control hydraulic unit of the sensor forward and reverse linear quadratic control hydraulic unit controller that moves.Utilize this hydraulic oil pumping unit, can control neatly stroke and speed according to the characteristic of oil well, thereby, can fully recover the oil, improve output, and because potential energy accumulator energy storage of potential energy and subsequently release, therefore reduce electric energy loss, improved manufacturing efficiency.
In this hydraulic oil pumping unit, flywheel, asynchronous motor and linear quadratic control hydraulic unit share an axle.In the process that sucker rod moves downward, the linear quadratic control hydraulic unit is as motor driving flywheel rotation, is converted to the rotation function of flywheel with the gravitational potential energy with sucker rod etc.Therefore, energy conversion efficiency depends primarily on the rotation speed change scope of flywheel.According to this design, flywheel and electromechanics coupling, that is, the rotor of flywheel and motor must rotate synchronously.Therefore, limited by the velocity range of motor to the velocity variations scope of the vital flywheel of energy recycling efficient.Just because of this reason, wish that motor allows to have large velocity variations scope.Because synchronous machine has strict fixing speed, what therefore select as described above is asynchronous motor.Yet for asynchronous motor, the velocity variations scope that allows also is limited, has therefore greatly limited energy recycling efficient.
On the other hand, if the velocity variations scope is fixed, the energy recycling ability is only relevant with the inertia of flywheel.This meeting is so that flywheel has very large size and weight, thereby gives actual production and the huge problem of all bringing is installed.
In this case, have high energy recycling efficient and a hydraulic oil pumping unit simple and reliable for structure in the urgent need to a kind of.
The model utility content
The purpose of this utility model provides a kind of power unit and a kind of hydraulic oil pumping unit that comprises this power unit of hydraulic oil pumping unit, in order to overcome above-mentioned at least one shortcoming.
According to first aspect of the present utility model, a kind of power unit of hydraulic oil pumping unit is provided, comprising:
Motor;
Be used for driving the reciprocating sucker rod drive unit of sucker rod;
By described motor-driven variable displacement pump, described variable displacement pump hydraulic connecting is to the sucker rod drive unit;
Hydraulic connecting is to the secondary hydraulic control unit of described sucker rod drive unit;
The accumulator of secondary hydraulic control unit is in transmission connection;
The sensor that is used for the stroke of setting sucker rod;
Based on the signal of described sensor and so that the variable pump delivery be zero in sucker rod decline process, in the sucker rod uphill process for just to drive the first control device of described sucker rod drive unit; And
So that driving accumulator as motor in sucker rod decline process, the linear quadratic control hydraulic unit driven to drive the second control device of described sucker rod drive unit as pump by accumulator based on the signal of described sensor.
Preferably, described secondary hydraulic control unit is bidirectional ram pump; And/or described accumulator is flywheel; And/or described sucker rod drive unit comprises oil cylinder or hydraulic wireline winch.
Preferably, described first control device is the first control valve that hydraulic connecting arrives described variable displacement pump; And/or described second control device is the second control valve that hydraulic connecting arrives described secondary hydraulic control unit.
Preferably, described first, second control valve is the combination of proportional pressure-reducing valve or proportional reversing valve or common solenoid directional control valve and pressure valve.
Preferably, the moving direction of the direction of described sucker rod drive unit tractive sucker rod and sucker rod is in alignment.
Preferably, described power unit comprises also that by the first control valve to variable displacement pump, supply with the control pump of control oil by the second control valve to the secondary hydraulic control unit, described control pump and variable displacement pump are in transmission connection, and with described motor and variable displacement pump coaxial arrangement.
Preferably, between described variable displacement pump and described sucker rod drive unit, be provided with the one-way valve that only allows hydraulic oil to flow from described variable displacement pump to described sucker rod drive unit; And/or between described linear quadratic control hydraulic unit and described sucker rod drive unit, being provided with Pilot operated check valve, described Pilot operated check valve is suitable for staying open in the normal step-down operation process of sucker rod and stops hydraulic oil to flow from described sucker rod drive unit to described linear quadratic control hydraulic unit under shutdown and abnormal conditions.
Preferably, described sensor is analog sensor or is made of top approach switch and bottom approach switch.
Preferably, described power unit also comprises the hydraulic diffluence motor that is suitable for driving simultaneously a plurality of sucker rod drive units.
According to second aspect of the present utility model, a kind of hydraulic oil pumping unit is provided, described hydraulic oil pumping unit comprises at least one described power unit.
Only be in transmission connection with the secondary hydraulic control unit by flywheel and motor are thrown off according to power unit of the present utility model, enlarged the velocity variations scope of flywheel, thereby can improve energy recycling efficient, and allow flywheel to have little size.This design is simple and reliable for structure, and allows to use cheaply motor, thereby has further reduced equipment cost.
Description of drawings
Below, by describing in more detail the utility model referring to accompanying drawing, can understand better principle of the present utility model, characteristics and advantage.Accompanying drawing comprises:
Fig. 1 shows the sketch according to the power unit of the hydraulic oil pumping unit of an exemplary embodiment of the present utility model.
Fig. 2 shows another embodiment of sucker rod drive unit of the power unit of hydraulic oil pumping unit.
Embodiment
Below, will specific embodiment of the utility model be described in more detail referring to accompanying drawing, better understand basic thought of the present utility model.
Fig. 1 shows the sketch according to the power unit 100 of the hydraulic oil pumping unit of an exemplary embodiment of the present utility model.
As shown in Figure 1, this power unit 100 comprises: motor 1; Thereby be in transmission connection by the variable displacement pump 2 of described motor 1 driving with described motor 1; Linear quadratic control hydraulic unit 3; Thereby the flywheel 4 that is in transmission connection and together rotates with described linear quadratic control hydraulic unit 3 with linear quadratic control hydraulic unit 3; Be used for driving the reciprocating sucker rod drive unit 5 of sucker rod (not shown); The sensor 6 that is used for the stroke of setting sucker rod; The first control valve 7, this first control valve 7 is according to the SC sigmal control variable displacement pump 2 from sensor 6; And second control valve 8, this second control valve 8 is according to the drive manner from the SC sigmal control linear quadratic control hydraulic unit 3 of sensor 6.
In exemplary embodiment shown in Figure 1, the driving hydraulic pipe line 9 of sucker rod drive unit 5 by being connected to it be by hydraulic driving, and be connected to the variable displacement pump hydraulic pipe line 91 of P port of variable displacement pump 2 and the linear quadratic control hydraulic unit hydraulic pipe line 92 that is connected to the P port of linear quadratic control hydraulic unit 3 and jointly be connected to and drive hydraulic pipe line 9.
Be in the process of decline at sucker rod, the second control valve 8 is based on the SC sigmal control linear quadratic control hydraulic unit 3 from sensor 6, make it as motor with the drive manner that changes linear quadratic control hydraulic unit 3, linear quadratic control hydraulic unit 3 utilizes the gravitational potential energy of the structure member that moves downward with sucker rod on sucker rod and the sucker rod drive unit 5 to come flywheel driven 4 to accelerate rotation at the output terminal output torque at this moment.Simultaneously, the first control valve 7 is same based on the SC sigmal control variable displacement pump 2 from sensor 6 in this process, and the discharge capacity that preferably makes variable displacement pump 2 is zero, namely closes variable displacement pump 2.
When sucker rod reaches the lower dead center of stroke and will rise, the second control valve 8 makes it as pump based on the drive manner that the signal from sensor 6 changes linear quadratic control hydraulic unit 3, simultaneously the first control valve 7 opens and with certain discharge capacity work variable displacement pump 2 based on the signal from sensor 6, thereby motor 1 and flywheel 4 drive respectively as power source and variable displacement pump 2 and this moment drive together sucker rod drive unit 5 as the linear quadratic control hydraulic unit 3 of pump work and drive sucker rod and rise and recover the oil.
As mentioned above, variable displacement pump 2 can close and open by the control of the first control valve 7 and can change displacement size, and linear quadratic control hydraulic unit 3 can be used as pump or motor operations by the control of the second control valve 8.Thereby, can come to drive sucker rod with motor 1 by the gravitational potential energy that flywheel 4 takes full advantage of the structure member that moves downward with sucker rod on sucker rod and the sucker rod drive unit 5 and rise, thus the energy consumption of greatly having saved motor 1.
Motor 1 can adopt common electric machine, also can adopt Slipper motor.
Linear quadratic control hydraulic unit 3 is preferably bidirectional ram pump, under the effect of the second control valve 8, can change drive manner, when running well, be subjected to drive (namely at input end, driven by flywheel 4) as pump, to drive sucker rod rising oil pumping with variable displacement pump 2, and when sucker rod descends generation potential energy, linear quadratic control hydraulic unit 3 utilizes this potential energy at the output terminal output torque as motor, accelerate rotation with flywheel driven 4, purpose is to store this gravitational potential energy to provide a part of power for sucker rod ascending motion subsequently.
In addition, power unit 100 also comprises control pump 10, comes controlled variable pump 2 and supplies with the drive manner that control oil changes linear quadratic control hydraulic unit 3 by the second control valve 8 to linear quadratic control hydraulic unit 3 supply with control oil for by the first control valve 7 variable displacement pump 2.The output terminal of variable displacement pump 2, control pump 10 and linear quadratic control hydraulic unit 3, be that their P port also is connected respectively to Decompression valves 11,12,13, prevent overpressure.Preferably, control pump 10 variable displacement pump 2 that is in transmission connection.In this case, preferably make motor 1, variable displacement pump 2 and control pump 10 coaxial arrangement, so that these two parts drive by motor 1, thereby the structure of whole power unit 100 is more compact.Transmission shaft between motor 1, variable displacement pump 2 and the control pump 10 is in the same direction rotation all the time, shown in the clockwise direction arrow among Fig. 1.Certainly, also can rotate in the counterclockwise direction.
According to an exemplary embodiment, in variable displacement pump hydraulic pipe line 91, be provided with one-way valve 93, this one-way valve 93 only allows hydraulic oil to flow to driving hydraulic pipe line 9 from variable displacement pump 2 when operation.
According to an exemplary embodiment, in linear quadratic control hydraulic unit hydraulic pipe line 92, be provided with Pilot operated check valve 94.Pilot operated check valve 94 is in open mode by the hydraulic control mode under the normal decline state of sucker rod, thereby allow hydraulic oil to flow along either direction between linear quadratic control hydraulic unit 3 and sucker rod drive unit 5 according to running state, and under abnormal conditions, can switch to do not allow hydraulic oil from sucker rod drive unit 5 to the linear quadratic control hydraulic unit 3 states that flow, thereby, can prevent the safety problem that the accident of the structure member that moves with sucker rod on sucker rod and the sucker rod drive unit 5 descends and brings.
In exemplary embodiment shown in Figure 1, sucker rod drive unit 5 comprises oil cylinder 51, and this oil cylinder 51 is fixedly mounted in the cylinder bracket (not shown) or is directly installed on the oil well tree (not shown).Oil cylinder 51 has the upper end of opening and the bottom of sealing, the lower end oil-tightness ground of cylinder piston rod 52 and being slidably disposed in the oil cylinder 51, the upper end of cylinder piston rod 52 is stretched out outside the oil cylinder 51 and sheave block 53(runner group is installed), this sheave block 53 comprises the stationary axle 531 that is fixedly connected with the upper end of cylinder piston rod 52, cylinder piston rod 52 is vertical with stationary axle 531, when cylinder piston rod 52 moves up and down, drive stationary axle 531 and also move up and down.The movable pulley 532 that can rotate around it is installed on the stationary axle 531, is wound with traction piece 54, such as wire rope or belt etc. on the movable pulley 532.The first end 541 of traction piece 54 is fixed on cylinder bracket or other static structures, 542 at the second end walk around movable pulley 532 also (for example by rope hanger 55) be fixedly connected with to drive the sucker rod to-and-fro motion with sucker rod.
When cylinder piston rod 52 rises, stationary axle 531 rises thereupon, because the first end 541 of traction piece 54 is fixed and movable pulley 532 can rotate with respect to stationary axle 531, frictional force between traction piece 54 and the movable pulley 532 and the weight of sucker rod are rotated (along the counter clockwise direction among Fig. 1) with respect to stationary axle 531 together so that traction piece 54 is followed movable pulley 532, thereby the second end 542 of traction piece 54 rises, and drives sucker rod rising oil pumping.
When cylinder piston rod 52 descends, stationary axle 531 descends thereupon, traction piece 54 is followed movable pulley 532 and is rotated along opposite direction (being the clockwise direction among Fig. 1) with respect to stationary axle 531 together, thereby the second end 542 of traction piece 54 descends, and sucker rod descends thereupon.
By adopting this sheave block 53, when cylinder piston rod 52 moves, the stroke that sucker rod moves is the twice of the stroke of cylinder piston rod 52, thereby in the constant situation of the stroke of sucker rod, can greatly shorten the length of oil cylinder 51 and cylinder piston rod 52, reduce height and the overall weight of equipment, be convenient to transportation and site installation test, thereby be applicable to the abominable places of natural condition such as offshore platform, desert, snowfield, and improved the stability of structure, so that more anti-wind.
Need to prove that stationary axle 531 is not limited to one, movable pulley 532 is not limited to one, for example can be two movable pulleys that are separately positioned on the two ends of stationary axle 531.In other words, can adopt the combination of a plurality of stationary axle and more movable pulleys, to realize the stroke of different multiples.And, according to the needs of stroke, can also adopt the combination of static pulley and movable pulley.
As mentioned above, the utility model adopts sheave block 53 to realize the prolongation of stroke, but the utility model is not limited to this.The utility model also can adopt the runner group of other form, such as chain wheel set, belt wheel group etc., reaches similar effect.
Preferably, the direction of the direction of traction piece 54 tractive sucker rods and sucker rod motion arranges that point-blank this sucker rod that has guaranteed underwell pump can work long hours, and has prolonged working life.
Sensor 6 is preferably displacement transducer, for example angular encoder or rotating coder.Angular encoder or rotating coder can be installed on the sheave block 53, for example are installed on the movable pulley 532, obtain the linear displacement of traction piece 54 and then obtain the stroke of sucker rod by the revolution that detects movable pulley 532.Sensor 6 can also be that other are used for directly measuring the linear displacement of traction piece 54, namely set the displacement transducer of the stroke of sucker rod, magnetic induction measurement device for example, the approach switch of upper and lower two normally closed or open types arranged spaced apart for example is such as the top approach switch 61 among Fig. 1 and bottom approach switch 62.Distance between two approach switchs has determined the stroke of sucker rod.Sensor 6 also can be analog sensor, not only can determine the reciprocating limit position of sucker rod and direct of travel this moment, and can determine sucker rod accurate location at any time, thereby can change stroke in any position in the maximum stroke scope in theory.
According to another exemplary embodiment, sucker rod drive unit of the present utility model also can adopt structural type shown in Figure 2.This sucker rod drive unit 5 ' comprises oil cylinder 51 ' and the cylinder piston rod 52 ' that pumps in oil cylinder 51 '.Oil cylinder 51 ' is supported on the cylinder bracket 56.The upper end of cylinder piston rod 52 ' is divided into upper and lower two chambers with oil cylinder 51 ', and upper chamber is connected to the first hydraulic pipe line 95, and lower chambers is connected to the second hydraulic pipe line 96.The lower end of cylinder piston rod 52 ' is connected to sucker rod.Cylinder bracket 56 is provided with sensor 6 ', i.e. top approach switch 61 ' and bottom approach switch 62 ' are to be used for setting the stroke of cylinder piston rod 52 ' (that is, sucker rod).
In addition, according to another exemplary embodiment, sucker rod drive unit of the present utility model also can be hydraulic wireline winch, utilizes the pulling sucker rods such as the hawser of hydraulic wireline winch or belt to pump.
According to a simple exemplary embodiment, the first control valve 7 only is used for the opening and closing of controlled variable pump 2, and at this moment, the first control valve 7 can be any suitable device of opening and closing that can controlled variable pump 2.Preferably, the first control valve 7 is except can the opening and closing of controlled variable pump 2, discharge capacity that can also Moderator Variable pump 2, at this moment, the first control valve 7 can for example be Proportional valve, such as proportional pressure-reducing valve, proportional reversing valve etc., and it has proportion electro-magnet 71, whether Comparative Examples electromagnet energising of the signal deciding that transmits according to sensor 6, thereby the opening and closing of controllable variable pump 2.And, according to the size of current of Comparative Examples electromagnet 71 energising, discharge capacity that can also Moderator Variable pump 2, thereby, change the movement velocity of sucker rod.The first control valve 7 can realize by common solenoid directional control valve or pressure valve or their combination that also this moment, speed can't electricly be regulated, but can manual tune.
The second control valve 8 is preferably Proportional valve, such as proportional pressure-reducing valve, proportional reversing valve etc., it has two proportion electro-magnets 81,82, according to the signal that sensor 6 transmits different proportion electro-magnets is switched on, thereby can switch the drive manner of linear quadratic control hydraulic unit 3, for example switch the drive manner of bidirectional ram pump.And the size of current according to Comparative Examples electromagnet 81,82 energisings can also change the bidirectional ram pump delivery, thereby, the movement velocity of change sucker rod.Similarly, the second control valve 8 can realize by common solenoid directional control valve or pressure valve or their combination that also this moment, speed can't electricly be regulated, but can manual tune.
Power unit 100 also comprises fuel tank, to give the fuel feeding such as variable displacement pump 2, control pump 10, linear quadratic control hydraulic unit 3.Preferably, all need the parts of fuel feeding all to be connected to a shared fuel tank, with further simplified structure and reduction cost.
Below, based on power unit shown in Figure 1 100 an exemplary work cycle is described:
When initial, cylinder piston rod 52 is positioned at the lower dead center of its stroke, and sensor 6 produces the signal that cylinder piston rod 52 is positioned at lower dead center.At this moment, the signal that the first control valve 7 receives from sensor 6 is opened variable displacement pump 2, the signal that the second control valve 8 receives from sensor 6 makes linear quadratic control hydraulic unit 3 as pump, but this moment, flywheel 4 remained static, so linear quadratic control hydraulic unit 3 is not in fact as pump work.In this case, in fact only by variable displacement pump 2 cylinder piston rod 52 is moved upward.In this movement process, preferably make the first control valve 7 realize little discharge capacity with little controlled quentity controlled variable, and then cylinder piston rod 52 needing to have avoided large power of motor with microinching.
When cylinder piston rod 52 rises to the top dead center of its stroke, sensor 6 produces the signal that cylinder piston rod 52 arrives top dead center, next step will move downward, the first control valve 7 receives signal from sensor 6, and to make the discharge capacity of variable displacement pump 2 be zero, the signal that the second control valve 8 receives from sensor 6 makes linear quadratic control hydraulic unit 3 change drive manners and as motor, opens simultaneously Pilot operated check valve 94.Linear quadratic control hydraulic unit 3 makes flywheel 4 accelerate rotation with cylinder piston rod 52 and with the structure member of the cylinder piston rod 52 motion moment of torsion that the gravitational potential energy that produces is converted into its output terminal that descends, to store this gravitational potential energy.
When cylinder piston rod 52 drops to the lower dead center of its stroke, sensor 6 produces the signal that cylinder piston rod 52 arrives lower dead center, next step will move upward, the signal that the first control valve 7 receives from sensor 6 is opened variable displacement pump 2, and the signal that the second control valve 8 receives from sensor 6 makes linear quadratic control hydraulic unit 3 change drive manners and is used as pump.Thereby the flywheel 4 of motor 1 and rotation drives respectively variable displacement pump 2 as power source and linear quadratic control hydraulic unit 3 makes cylinder piston rod 52 move upward together.After this operation goes round and begins again.
In above-mentioned work cycle, because cylinder piston rod 52 and the gravitational potential energy that produces with the structure member decline that cylinder piston rod 52 moves are stored by flywheel 4, and be used for subsequently driving cylinder piston rod 52 and move upward, thereby can maximally utilise decline potential energy, saved energy.
According to an exemplary embodiment, when the linear quadratic control hydraulic unit is bidirectional ram pump, pivot angle that can be by making bidirectional ram pump is for just, for example positive 5 degree, positive 15 degree make it use as pump, pivot angle that simultaneously can be by making bidirectional ram pump for negative, for example negative 10 degree, for example negative 15 degree make it use as motor.In the reality, the pivot angle size of bidirectional ram pump can change as required, changing its discharge capacity, thereby can control the speed that moves up and down of sucker rod.Obviously, the pivot angle of bidirectional ram pump is not limited to above-mentioned exemplary angles.
And, according to another exemplary embodiment, also can in driving hydraulic pipe line 9, hydraulic diffluence motor be set, drive simultaneously a plurality of sucker rod drive units by hydraulic diffluence motor, and then recover the oil when realizing many mouthfuls of wells.
According to the utility model, because flywheel is in transmission connection with the linear quadratic control hydraulic unit and is not connected with motor-driven, therefore, can make flywheel have larger velocity variations scope, thereby can make flywheel store more gravitational potential energy, improve energy recycling efficient, reduced simultaneously performance requirement and cost to motor.
Although it is pointed out that with flywheel and describe in detail as example, obviously also can adopt other forms of accumulator.Because accumulator, linear quadratic control hydraulic unit no longer are connected with motor-driven, therefore can reduce at least the characteristic requirements to motor, enlarged the range of choice of motor.
For a person skilled in the art, other advantages of the present utility model and substituting mode of execution are apparent.Therefore, shown in the utility model is not limited to regard to its more wide in range meaning and described detail, exemplary configuration and exemplary embodiment.On the contrary, those skilled in the art can carry out various modifications and substitute in the situation that does not break away from essence spirit of the present utility model and scope.

Claims (10)

1. the power unit of a hydraulic oil pumping unit comprises:
Motor;
Be used for driving the reciprocating sucker rod drive unit of sucker rod;
By described motor-driven variable displacement pump, described variable displacement pump hydraulic connecting is to the sucker rod drive unit;
Hydraulic connecting is to the secondary hydraulic control unit of described sucker rod drive unit;
The accumulator of secondary hydraulic control unit is in transmission connection;
The sensor that is used for the stroke of setting sucker rod;
Based on the signal of described sensor and so that the variable pump delivery be zero in sucker rod decline process, in the sucker rod uphill process for just to drive the first control device of described sucker rod drive unit; And
So that driving accumulator as motor in sucker rod decline process, the linear quadratic control hydraulic unit driven to drive the second control device of described sucker rod drive unit as pump by accumulator based on the signal of described sensor.
2. power unit as claimed in claim 1 is characterized in that,
Described secondary hydraulic control unit is bidirectional ram pump; And/or
Described accumulator is flywheel; And/or
Described sucker rod drive unit comprises oil cylinder or hydraulic wireline winch.
3. power unit as claimed in claim 2 is characterized in that,
Described first control device is the first control valve that hydraulic connecting arrives described variable displacement pump; And/or
Described second control device is the second control valve that hydraulic connecting arrives described secondary hydraulic control unit.
4. power unit as claimed in claim 3 is characterized in that,
Described first, second control valve is the combination of proportional pressure-reducing valve or proportional reversing valve or common solenoid directional control valve and pressure valve.
5. such as arbitrary described power unit in the claim of front, it is characterized in that,
The direction of described sucker rod drive unit tractive sucker rod and the moving direction of sucker rod are in alignment.
6. such as claim 3 or 4 described power units, it is characterized in that,
Described power unit comprises also that by the first control valve to variable displacement pump, supply with the control pump of control oil by the second control valve to the secondary hydraulic control unit, described control pump and variable displacement pump are in transmission connection, and with described motor and variable displacement pump coaxial arrangement.
7. such as arbitrary described power unit among the claim 1-4, it is characterized in that,
Between described variable displacement pump and described sucker rod drive unit, be provided with the one-way valve that only allows hydraulic oil to flow from described variable displacement pump to described sucker rod drive unit; And/or
Be provided with Pilot operated check valve between described linear quadratic control hydraulic unit and described sucker rod drive unit, described Pilot operated check valve is suitable for staying open in the normal step-down operation process of sucker rod and stops hydraulic oil to flow from described sucker rod drive unit to described linear quadratic control hydraulic unit under shutdown and abnormal conditions.
8. such as arbitrary described power unit among the claim 1-4, it is characterized in that,
Described sensor is analog sensor or is made of top approach switch and bottom approach switch.
9. such as arbitrary described power unit among the claim 1-4, it is characterized in that,
Described power unit also comprises the hydraulic diffluence motor that is suitable for driving simultaneously a plurality of sucker rod drive units.
10. a hydraulic oil pumping unit is characterized in that, described hydraulic oil pumping unit comprises that at least one is such as arbitrary described power unit among the claim 1-9.
CN 201320255496 2013-05-10 2013-05-10 Power unit of hydraulic pumping unit and corresponding hydraulic pumping unit Withdrawn - After Issue CN203239662U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201320255496 CN203239662U (en) 2013-05-10 2013-05-10 Power unit of hydraulic pumping unit and corresponding hydraulic pumping unit

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Application Number Priority Date Filing Date Title
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Publications (1)

Publication Number Publication Date
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104141644A (en) * 2013-05-10 2014-11-12 博世力士乐(常州)有限公司 Power unit of hydraulic pumping unit and corresponding hydraulic pumping unit
CN107435529A (en) * 2016-05-27 2017-12-05 胜利油田高原石油装备有限责任公司 Using can reverse variable pump times journey hydraulic pumping unit

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104141644A (en) * 2013-05-10 2014-11-12 博世力士乐(常州)有限公司 Power unit of hydraulic pumping unit and corresponding hydraulic pumping unit
WO2014180322A1 (en) * 2013-05-10 2014-11-13 博世力士乐(常州)有限公司 Power unit of hydraulic pumping unit and corresponding hydraulic pumping unit
CN104141644B (en) * 2013-05-10 2017-12-15 博世力士乐(常州)有限公司 The power unit of hydraulic oil pumping unit and corresponding hydraulic oil pumping unit
US10260497B2 (en) 2013-05-10 2019-04-16 Robert Bosch Gmbh Power unit of hydraulic pumping unit and corresponding hydraulic pumping unit
CN107435529A (en) * 2016-05-27 2017-12-05 胜利油田高原石油装备有限责任公司 Using can reverse variable pump times journey hydraulic pumping unit
CN107435529B (en) * 2016-05-27 2020-02-11 胜利油田高原石油装备有限责任公司 Double-stroke hydraulic pumping unit adopting reversible variable pump

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