CN201381841Y - Variable-frequency energy-saving control device of oil pumping unit - Google Patents
Variable-frequency energy-saving control device of oil pumping unit Download PDFInfo
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- CN201381841Y CN201381841Y CN200920301644U CN200920301644U CN201381841Y CN 201381841 Y CN201381841 Y CN 201381841Y CN 200920301644 U CN200920301644 U CN 200920301644U CN 200920301644 U CN200920301644 U CN 200920301644U CN 201381841 Y CN201381841 Y CN 201381841Y
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Abstract
The utility model relates to a device for controlling the rotational speed of a motor of an oil pumping unit, in particular to a variable-frequency energy-saving control device of an oil pumping unit, which comprises a frame, a speed reducer support, an oil pumping unit crank shaft, a variable-frequency motor and a motor power supply circuit, wherein the variable-frequency motor is fixedly mounted on the frame, an induction magnet is arranged on the oil pumping unit crank shaft, an upstroke induction head and/or a downstroke induction head are fixedly arranged on the speed reducer support and capable of receiving the signals from the induced magnet, the upstroke induction head and/or the downstroke induction head are electrically connected with the signal-receiving terminal of a variable-frequency controller through wires, and the motor power supply circuit consists of a three-phase alternating-current power source and the variable-frequency controller. The variable-frequency energy-saving control device has reasonable and compact structure, adjusts the speed of the motor by the frequency output from the variable-frequency controller, achieves the oil-pumping mode that the upstroke speed of the oil pumping unit is rapid and the downstroke speed of the oil pumping unit is slow, and greatly increases the oil-pumping efficiency.
Description
One, technical field
The utility model relates to control pumping-unit motor rotational speed devices, is a kind of oil pumper energy-saving and frequency-variable control device.
Two, background technology
Domestic many oil fields have entered into the oil recovery middle and later periods at present, oil reservoir is more and more darker, especially heavy oil wells or poor efficiency oil well inner fluid are mobile poor, it is slow to ooze pump, if thereby the identical oil of oil pumper pumping in the unit interval that just exists of the up-down stroke speed of oil pumper causes pumping efficiency lower less, ooze the efficiency of pump in order to improve, the general slow-speed of revolution oil pumper that adopts, and in order to adjust jig frequency, what adopt now is to change big small belt pulley and belt, so just has complex operation, not easily changeable problem.
Three, summary of the invention
The utility model provides a kind of oil pumper energy-saving and frequency-variable control device, overcome the deficiency of above-mentioned prior art, it can effectively solve because oil pumper low problem of pumping efficiency when heavy oil wells or poor efficiency oil well oil-pumping, regulate motor speed by the output frequency that utilizes frequency-variable controller, thereby realize the oil pumping of up-down stroke friction speed, thereby greatly improved pumping efficiency.
The technical solution of the utility model realizes by following measure: a kind of oil pumper energy-saving and frequency-variable control device comprises frame, reducer frame, oil pumping machine crank, variable-frequency motor and motor power supply circuits; On frame, be installed with variable-frequency motor, induced magnet is installed on oil pumping machine crank, on the reducer frame, be installed with the up stroke inductive head that can receive the induced magnet signal or/and the down stroke inductive head, the up stroke inductive head or/and the down stroke inductive head be electrically connected with the signal receiving end of frequency-variable controller by lead; These motor power supply circuits comprise three-phase alternating-current supply and frequency-variable controller; The three-phase electricity output of the electric output of three-phase alternating-current supply, the three-phase electricity input of frequency-variable controller, frequency-variable controller and the three-phase electricity input of variable-frequency motor electricity in regular turn are connected in series.
Be further optimization and/or improvements below to above-mentioned utility model technical scheme:
Above-mentioned these motor power supply circuits can comprise frequency conversion control circuit, and this frequency conversion control circuit comprises conversion power supply contactor and frequency conversion drive contactor; This conversion power supply contactor comprises conversion power supply contactor control coil, the conversion power supply contactor first three-phase constant open contact and conversion power supply contactor second constant open contact; This frequency conversion drive contactor comprises frequency conversion drive contactor control coil, the frequency conversion drive contactor first three-phase constant open contact and frequency conversion drive contactor second constant open contact; Electricity is connected in series with the conversion power supply contactor first three-phase constant open contact between the three-phase electricity input of the electric output of three-phase alternating-current supply and frequency-variable controller; Electricity is connected in series with the frequency conversion drive contactor first three-phase constant open contact between the three-phase electricity input of the three-phase electricity output of frequency-variable controller and variable-frequency motor; First utmost point of three-phase alternating-current supply, frequency conversion power frequency conversion contact, normal second utmost point of opening moving button, frequency conversion drive contactor second constant open contact, conversion power supply contactor control coil and three-phase alternating-current supply electricity in regular turn are connected in series and are constituted the loop; Two ends electricity at frequency conversion drive contactor second constant open contact and conversion power supply contactor control coil is connected in parallel to frequency conversion drive contactor control coil; Be connected in parallel to conversion power supply contactor second constant open contact at the normal two ends electricity of opening moving button.
Above-mentioned these motor power supply circuits can comprise work frequency circuit; This work frequency circuit comprises that power frequency drives contactor, and this power frequency drives contactor and comprises that power frequency drives the contactor control coil, power frequency drives the contactor first three-phase constant open contact and power frequency drives contactor second constant open contact; Electricity is connected in series with power frequency and drives the contactor first three-phase constant open contact between the three-phase electricity input of the electric output of three-phase alternating-current supply and variable-frequency motor; First utmost point of three-phase alternating-current supply, frequency conversion power frequency conversion contact, normal open second utmost point that moving button, power frequency drive contactor control coil and three-phase alternating-current supply in regular turn electricity be connected in series and constitute the loop; The normal two ends electricity of opening moving button is connected in parallel to power frequency and drives contactor second constant open contact.
Above-mentioned these motor power supply circuits can comprise the frequency conversion frequency circuit of changing a job, and this frequency conversion frequency circuit of changing a job comprises auxiliary reclay, and this auxiliary reclay comprises auxiliary reclay control coil, auxiliary reclay first constant open contact and auxiliary reclay constant close contact; The earthing pole of first utmost point of three-phase alternating-current supply, frequency-variable controller breakdown switch, auxiliary reclay control coil and three-phase alternating-current supply electricity in regular turn is connected in series and is constituted the loop; First utmost point of three-phase alternating-current supply, power frequency drive second utmost point that contactor first constant open contact, frequency conversion drive contactor the 3rd constant close contact, power frequency drive contactor control coil and three-phase alternating-current supply in regular turn electricity be connected in series and constitute the loop, the two ends electricity that drives contactor second constant open contact in power frequency is connected in parallel to auxiliary reclay first constant open contact; Electricity is connected in series with the auxiliary reclay constant close contact between moving button of normal unlatching and frequency conversion drive contactor second constant open contact.
The two ends of above-mentioned frequency-variable controller breakdown switch can be connected in parallel to auxiliary reclay second constant open contact by electricity.
The electric output of above-mentioned three-phase alternating-current supply can be connected in series with threephase switch by electricity.
First utmost point of above-mentioned three-phase alternating-current supply can be connected in series with the first normally closed stop button by electricity.
Can be connected in series with the second normally closed stop button by electricity between first utmost point of above-mentioned frequency-variable controller breakdown switch and three-phase alternating-current supply.
Can be connected in series with the normally closed stop button of interlock by electricity between first utmost point of above-mentioned frequency-variable controller breakdown switch and three-phase alternating-current supply.
The utility model reasonable and compact in structure is regulated motor speed by the output frequency that utilizes frequency-variable controller, and the upstroke speed that has realized oil pumper is fast and the slow-footed mode of down stroke is pumped, thereby has greatly improved pumping efficiency.
Four, description of drawings
Accompanying drawing 1 is the main TV structure schematic diagram of the utility model most preferred embodiment.
Accompanying drawing 2 is the electrical block diagram of the utility model most preferred embodiment.
Coding in the accompanying drawing is respectively: 1 is frame, 2 is the reducer frame, 3 is oil pumping machine crank, 4 is frequency-variable controller, 5 is induced magnet, 6 is the up stroke inductive head, 7 is the down stroke inductive head, MC1 is a conversion power supply contactor control coil, MC10 is the conversion power supply contactor first three-phase constant open contact, MC11 is conversion power supply contactor second constant open contact, MC2 is a frequency conversion drive contactor control coil, MC20 is the frequency conversion drive contactor first three-phase constant open contact, MC21 is frequency conversion drive contactor second constant open contact, MC22 is frequency conversion drive contactor the 3rd constant close contact, MC3 is that power frequency drives the contactor control coil, MC30 is that power frequency drives the contactor first three-phase constant open contact, MC31 is that power frequency drives contactor second constant open contact, ZJ is the auxiliary reclay control coil, ZJ1 is auxiliary reclay first constant open contact, ZJ2 is the auxiliary reclay constant close contact, ZJ3 is auxiliary reclay second constant open contact, DK is a threephase switch, D is a variable-frequency motor, and QA is the normal moving button of opening, and TA is the normally closed stop button of interlock, XWK is a frequency conversion power frequency conversion contact, A is first utmost point of three-phase alternating-current supply, and B is second utmost point of three-phase alternating-current supply, and N is the earthing pole of three-phase alternating-current supply.
Five, the specific embodiment
The utility model is not subjected to the restriction of following embodiment, can determine concrete embodiment according to the technical solution of the utility model and actual conditions.
Below in conjunction with embodiment and accompanying drawing the utility model is further described:
Shown in accompanying drawing 1,2, this oil pumper energy-saving and frequency-variable control device comprises frame 1, reducer frame 2, oil pumping machine crank 3, variable-frequency motor D and motor power supply circuits; On frame 1, be installed with variable-frequency motor D, induced magnet 5 is installed on oil pumping machine crank 3, on reducer frame 2, be installed with the up stroke inductive head 6 that can receive the induced magnet signal or/and down stroke inductive head 7, up stroke inductive head 6 or/and down stroke inductive head 7 be electrically connected with the signal receiving end of frequency-variable controller by lead; These motor power supply circuits comprise three-phase alternating-current supply and frequency-variable controller 4; The three-phase electricity output of the electric output of three-phase alternating-current supply, the three-phase electricity input of frequency-variable controller 4, frequency-variable controller 4 and the three-phase electricity input of variable-frequency motor D electricity in regular turn are connected in series.Inductive head can adopt up stroke inductive head 6 or down stroke inductive head 7, and perhaps inductive head can adopt up stroke inductive head 6 and down stroke inductive head 7, preferably adopts up stroke inductive head 6 and down stroke inductive head 7 to use simultaneously in actual applications.
Can according to actual needs above-mentioned oil pumper energy-saving and frequency-variable control device be made further optimization and/or improvements:
As shown in Figure 2, these motor power supply circuits comprise frequency conversion control circuit, and this frequency conversion control circuit comprises conversion power supply contactor and frequency conversion drive contactor; This conversion power supply contactor comprises conversion power supply contactor control coil MC1, the conversion power supply contactor first three-phase constant open contact MC10 and the conversion power supply contactor second constant open contact MC11; This frequency conversion drive contactor comprises frequency conversion drive contactor control coil MC2, the frequency conversion drive contactor first three-phase constant open contact MC20 and the frequency conversion drive contactor second constant open contact MC21; Electricity is connected in series with the conversion power supply contactor first three-phase constant open contact MC10 between the three-phase electricity input of the electric output of three-phase alternating-current supply and frequency-variable controller 4; Electricity is connected in series with the frequency conversion drive contactor first three-phase constant open contact MC20 between the three-phase electricity input of the three-phase electricity output of frequency-variable controller 4 and variable-frequency motor D; First utmost point A of three-phase alternating-current supply, frequency conversion power frequency conversion contact XWK, normal second utmost point B that opens moving button QA, the frequency conversion drive contactor second constant open contact MC21, conversion power supply contactor control coil MC1 and three-phase alternating-current supply electricity in regular turn are connected in series and are constituted the loop; Two ends electricity at frequency conversion drive contactor second constant open contact MC21 and conversion power supply contactor control coil MC1 is connected in parallel to frequency conversion drive contactor control coil MC2; Be connected in parallel to the conversion power supply contactor second constant open contact MC21 at the normal two ends electricity of opening moving button QA, first utmost point A, second utmost point B, the 3rd of three-phase alternating-current supply extremely all can exchange mutually.
As shown in Figure 2, these motor power supply circuits comprise work frequency circuit; This work frequency circuit comprises that power frequency drives contactor, and this power frequency drives contactor and comprises that power frequency drives contactor control coil MC3, power frequency drives the contactor first three-phase constant open contact MC30 and power frequency drives the contactor second constant open contact MC31; Electricity is connected in series with power frequency and drives the contactor first three-phase constant open contact MC30 between the three-phase electricity input of the electric output of three-phase alternating-current supply and variable-frequency motor D; First utmost point A of three-phase alternating-current supply, frequency conversion power frequency conversion contact XWK, normal open second utmost point B that moving button QA, power frequency drive contactor control coil MC3 and three-phase alternating-current supply in regular turn electricity be connected in series and constitute the loop; The normal two ends electricity of opening moving button is connected in parallel to power frequency and drives the contactor second constant open contact MC31.
As shown in Figure 2, these motor power supply circuits comprise the frequency conversion frequency circuit of changing a job, this frequency conversion frequency circuit of changing a job comprises auxiliary reclay, and this auxiliary reclay comprises auxiliary reclay control coil ZJ, the auxiliary reclay first constant open contact ZJ1 and auxiliary reclay constant close contact ZJ2; The earthing pole N of first utmost point A, frequency-variable controller breakdown switch, auxiliary reclay control coil ZJ and the three-phase alternating-current supply of three-phase alternating-current supply electricity in regular turn is connected in series and is constituted the loop; First utmost point A of three-phase alternating-current supply, power frequency drive second utmost point B that the contactor first constant open contact ZJ1, frequency conversion drive contactor the 3rd constant close contact MC22, power frequency drive contactor control coil MC3 and three-phase alternating-current supply in regular turn electricity be connected in series and constitute the loop, the two ends electricity that drives the contactor second constant open contact MC31 in power frequency is connected in parallel to the auxiliary reclay first constant open contact ZJ1; Electricity is connected in series with auxiliary reclay constant close contact ZJ2 between moving button QA of normal unlatching and the frequency conversion drive contactor second constant open contact MC21.
As shown in Figure 2, the two ends electricity of frequency-variable controller breakdown switch is connected in parallel to the auxiliary reclay second constant open contact ZJ3.
As shown in Figure 2, for the ease of on-off circuit, the electric output electricity of three-phase alternating-current supply is connected in series with threephase switch DK.
For the ease of on-off circuit, first utmost point A electricity of three-phase alternating-current supply is connected in series with the first normally closed stop button.
For the ease of on-off circuit, electricity is connected in series with the second normally closed stop button between first utmost point A of frequency-variable controller breakdown switch and three-phase alternating-current supply.
As shown in Figure 2, electricity is connected in series with the normally closed stop button TA of interlock between first utmost point of frequency-variable controller breakdown switch and three-phase alternating-current supply.
Above technical characterictic has constituted most preferred embodiment of the present utility model, and it has stronger compliance and best implementation result, can increase and decrease non-essential technical characterictic according to actual needs, satisfies the demand of different situations.
The use of the utility model most preferred embodiment: when normal the use, press the moving button QA of normal unlatching, thereby frequency conversion drive contactor control coil MC2 conducting makes frequency conversion drive contactor first three-phase constant open contact MC20 and the second constant open contact MC21 adhesive of frequency conversion drive contactor, conducting makes conversion power supply contactor first three-phase constant open contact MC10 and the second constant open contact MC11 adhesive of conversion power supply contactor thereby the second constant open contact MC21 conducting of frequency conversion drive contactor drives conversion power supply contactor control coil MC1, whole frequency changer circuit conducting, and frequency conversion drive contactor the 3rd constant close contact MC22 disconnects, frequency converter 8 is devoted oneself to work, by up stroke inductive head 6 or/and the induced magnet 5 that down stroke inductive head 7 detects respectively on the oil pumping machine crank 4 is discerned up-down stroke, frequency converter 8 is provided with the different running frequency of up-down stroke in advance, realizes the oil pumping mode of the different speeds of service of up-down stroke with this; When frequency converter breaks down; thereby auxiliary reclay coil ZJ conducting disconnects the auxiliary reclay first constant open contact ZJ1 and the auxiliary reclay second constant open contact ZJ3 closure, auxiliary reclay constant close contact ZJ2; power frequency drives contactor control coil MC3 conducting and makes power frequency driving contactor first three-phase constant open contact MC30 and power frequency drive the contactor second constant open contact MC31 adhesive and make the work frequency circuit conducting; work frequency circuit is started working, thereby the assurance oil pumper is not shut down.
Claims (10)
1, a kind of oil pumper energy-saving and frequency-variable control device is characterized in that comprising frame, reducer frame, oil pumping machine crank, variable-frequency motor and motor power supply circuits; On frame, be installed with variable-frequency motor, induced magnet is installed on oil pumping machine crank, on the reducer frame, be installed with the up stroke inductive head that can receive the induced magnet signal or/and the down stroke inductive head, the up stroke inductive head or/and the down stroke inductive head be electrically connected with the signal receiving end of frequency-variable controller by lead; These motor power supply circuits comprise three-phase alternating-current supply and frequency-variable controller; The three-phase electricity output of the electric output of three-phase alternating-current supply, the three-phase electricity input of frequency-variable controller, frequency-variable controller and the three-phase electricity input of variable-frequency motor electricity in regular turn are connected in series.
2, oil pumper energy-saving and frequency-variable control device according to claim 1 is characterized in that these motor power supply circuits comprise frequency conversion control circuit, and this frequency conversion control circuit comprises conversion power supply contactor and frequency conversion drive contactor; This conversion power supply contactor comprises conversion power supply contactor control coil, the conversion power supply contactor first three-phase constant open contact and conversion power supply contactor second constant open contact; This frequency conversion drive contactor comprises frequency conversion drive contactor control coil, the frequency conversion drive contactor first three-phase constant open contact and frequency conversion drive contactor second constant open contact; Electricity is connected in series with the conversion power supply contactor first three-phase constant open contact between the three-phase electricity input of the electric output of three-phase alternating-current supply and frequency-variable controller; Electricity is connected in series with the frequency conversion drive contactor first three-phase constant open contact between the three-phase electricity input of the three-phase electricity output of frequency-variable controller and variable-frequency motor; First utmost point of three-phase alternating-current supply, frequency conversion power frequency conversion contact, normal second utmost point of opening moving button, frequency conversion drive contactor second constant open contact, conversion power supply contactor control coil and three-phase alternating-current supply electricity in regular turn are connected in series and are constituted the loop; Two ends electricity at frequency conversion drive contactor second constant open contact and conversion power supply contactor control coil is connected in parallel to frequency conversion drive contactor control coil; Be connected in parallel to conversion power supply contactor second constant open contact at the normal two ends electricity of opening moving button.
3, oil pumper energy-saving and frequency-variable control device according to claim 2 is characterized in that these motor power supply circuits comprise work frequency circuit; This work frequency circuit comprises that power frequency drives contactor, and this power frequency drives contactor and comprises that power frequency drives the contactor control coil, power frequency drives the contactor first three-phase constant open contact and power frequency drives contactor second constant open contact; Electricity is connected in series with power frequency and drives the contactor first three-phase constant open contact between the three-phase electricity input of the electric output of three-phase alternating-current supply and variable-frequency motor; First utmost point of three-phase alternating-current supply, frequency conversion power frequency conversion contact, normal open second utmost point that moving button, power frequency drive contactor control coil and three-phase alternating-current supply in regular turn electricity be connected in series and constitute the loop; The normal two ends electricity of opening moving button is connected in parallel to power frequency and drives contactor second constant open contact.
4, oil pumper energy-saving and frequency-variable control device according to claim 3, it is characterized in that these motor power supply circuits comprise the frequency conversion frequency circuit of changing a job, this frequency conversion frequency circuit of changing a job comprises auxiliary reclay, and this auxiliary reclay comprises auxiliary reclay control coil, auxiliary reclay first constant open contact and auxiliary reclay constant close contact; The earthing pole of first utmost point of three-phase alternating-current supply, frequency-variable controller breakdown switch, auxiliary reclay control coil and three-phase alternating-current supply electricity in regular turn is connected in series and is constituted the loop; First utmost point of three-phase alternating-current supply, power frequency drive second utmost point that contactor first constant open contact, frequency conversion drive contactor the 3rd constant close contact, power frequency drive contactor control coil and three-phase alternating-current supply in regular turn electricity be connected in series and constitute the loop, the two ends electricity that drives contactor second constant open contact in power frequency is connected in parallel to auxiliary reclay first constant open contact; Electricity is connected in series with the auxiliary reclay constant close contact between moving button of normal unlatching and frequency conversion drive contactor second constant open contact.
5, oil pumper energy-saving and frequency-variable control device according to claim 4 is characterized in that the two ends electricity of frequency-variable controller breakdown switch is connected in parallel to auxiliary reclay second constant open contact.
6, according to claim 1 or 2 or 3 or 4 or 5 described oil pumper energy-saving and frequency-variable control device, it is characterized in that the electric output electricity of three-phase alternating-current supply is connected in series with threephase switch.
7, according to claim 2 or 3 or 4 or 5 described oil pumper energy-saving and frequency-variable control device, it is characterized in that three-phase alternating-current supply first extremely electricity be connected in series with the first normally closed stop button.
8, oil pumper energy-saving and frequency-variable control device according to claim 6, it is characterized in that three-phase alternating-current supply first extremely electricity be connected in series with the first normally closed stop button.
9, oil pumper energy-saving and frequency-variable control device according to claim 4 is characterized in that electricity is connected in series with the second normally closed stop button between first utmost point of frequency-variable controller breakdown switch and three-phase alternating-current supply.
10, oil pumper energy-saving and frequency-variable control device according to claim 4 is characterized in that electricity is connected in series with the normally closed stop button of interlock between first utmost point of frequency-variable controller breakdown switch and three-phase alternating-current supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920301644U CN201381841Y (en) | 2009-03-26 | 2009-03-26 | Variable-frequency energy-saving control device of oil pumping unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920301644U CN201381841Y (en) | 2009-03-26 | 2009-03-26 | Variable-frequency energy-saving control device of oil pumping unit |
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| Publication Number | Publication Date |
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| CN201381841Y true CN201381841Y (en) | 2010-01-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920301644U Expired - Lifetime CN201381841Y (en) | 2009-03-26 | 2009-03-26 | Variable-frequency energy-saving control device of oil pumping unit |
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| CN (1) | CN201381841Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104234669A (en) * | 2014-09-08 | 2014-12-24 | 刘松岭 | Frequency conversion non-stop stroke adjustment and specific water-cycle adjustment device for pumping unit |
| CN106762589A (en) * | 2017-03-06 | 2017-05-31 | 杨欢 | A kind of oil pumper timesharing arrangements for speed regulation |
| WO2018014633A1 (en) * | 2016-07-20 | 2018-01-25 | 哈尔滨索菲电气技术有限公司 | Electric machine driving method and system for non-conventional working system of oil extractor |
| CN113445965A (en) * | 2021-09-01 | 2021-09-28 | 奥联图(西安)能源有限公司 | Method for regulating and controlling running attitude of energy-saving and efficient oil pumping unit |
-
2009
- 2009-03-26 CN CN200920301644U patent/CN201381841Y/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104234669A (en) * | 2014-09-08 | 2014-12-24 | 刘松岭 | Frequency conversion non-stop stroke adjustment and specific water-cycle adjustment device for pumping unit |
| WO2018014633A1 (en) * | 2016-07-20 | 2018-01-25 | 哈尔滨索菲电气技术有限公司 | Electric machine driving method and system for non-conventional working system of oil extractor |
| US10539129B2 (en) | 2016-07-20 | 2020-01-21 | Harbin Surfics Electrical Technology Inc | Electric machine driving method and system under non-conventional work mode of oil pumping unit |
| EA037665B1 (en) * | 2016-07-20 | 2021-04-28 | Харбин Серфикс Электрикал Текнолоджи Инк | Electric machine driving method and system under non-conventional work mode of oil pumping unit |
| CN106762589A (en) * | 2017-03-06 | 2017-05-31 | 杨欢 | A kind of oil pumper timesharing arrangements for speed regulation |
| CN113445965A (en) * | 2021-09-01 | 2021-09-28 | 奥联图(西安)能源有限公司 | Method for regulating and controlling running attitude of energy-saving and efficient oil pumping unit |
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