CN101950967A - Special voltage stabilizer for three-phase permanent magnet synchronous motor (PMSM) for producing well in oil field - Google Patents
Special voltage stabilizer for three-phase permanent magnet synchronous motor (PMSM) for producing well in oil field Download PDFInfo
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- CN101950967A CN101950967A CN 201010262174 CN201010262174A CN101950967A CN 101950967 A CN101950967 A CN 101950967A CN 201010262174 CN201010262174 CN 201010262174 CN 201010262174 A CN201010262174 A CN 201010262174A CN 101950967 A CN101950967 A CN 101950967A
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- 230000001360 synchronised effect Effects 0.000 title claims abstract description 24
- 239000003381 stabilizer Substances 0.000 title abstract 4
- 239000003129 oil well Substances 0.000 claims description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 239000003990 capacitor Substances 0.000 claims description 9
- 229910052799 carbon Inorganic materials 0.000 claims description 9
- 238000004080 punching Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 239000013078 crystal Substances 0.000 claims description 3
- 230000010355 oscillation Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 8
- 238000005086 pumping Methods 0.000 abstract description 3
- 230000006641 stabilisation Effects 0.000 abstract 1
- 238000011105 stabilization Methods 0.000 abstract 1
- 239000002699 waste material Substances 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000000087 stabilizing effect Effects 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000005347 demagnetization Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
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Abstract
The invention discloses a special voltage stabilizer for a three-phase permanent magnet synchronous motor (PMSM) for a producing well in an oil field, which solves the electric power waste phenomenon caused by voltage fluctuation of the existing three-phase PMSM for the producing well in the oil field. The voltage stabilizer is arranged between a three-phase supply and the three-phase PMSM and is provided with a voltage compensation circuit and a measurement and control circuit. The input end of the voltage compensation circuit is connected with in-phase voltage lines (three-phase input of an A1 phase, a B1 phase and a C1 phase), and the output end of the voltage compensation circuit is connected with out-phase voltage lines (three-phase output of an A2 phase, a B2 phase and a C2 phase); and the input end of the measurement and control circuit is connected with out-phase voltage lines (an A1 phase, a B1 phase and a C1 phase), and the output end of the measurement and control circuit is connected with the voltage compensation circuit. The voltage stabilizer of the invention can track the counter electromotive force of the three-phase PMSM in a real time by full-automatic voltage stabilization, so that a beam-pumping unit in the oil field can reach a very high power factor, thereby improving the efficiency, reducing the reactive power loss, increasing the power grid tolerance and saving the electric charge.
Description
Technical field
The present invention relates to a kind of pressurizer, specifically is the special-purpose pressurizer of a kind of oil well three-phase permanent magnet synchronous motor.
Background technology
In the oil exploitation of oil field, adopt motor usually by land, drive pumping unit of oil well, extract oil out ground, be transported to the predetermined area through pipeline again as power.Because the situation complexity of oil well, situations such as sand stall are often arranged, therefore need very big detent torque, yet under normal circumstances, required torque is with respect to starting and stifledly wanting little several times when husky, if employing threephase asynchronous, start and art is wanted in stifled big torque when husky in order to adapt to, the power of motor of Chang Xuan is very big, but required torque is less again in the mostly normal oil pumping process, the phenomenon that power wastage can occur, it is on the low side to add the threephase asynchronous power factor, so the power wastage phenomenon is very serious.Increasing in recent years oil well is replaced by three-phase permanent magnet synchronous motor, in the motor of equal rated power, three-phase permanent magnet synchronous motor is more much bigger than the detent torque of threephase asynchronous machine, and power factor is also superior than the former, under optimum Working, need not compensate just and can reach or approach 1.
Three-phase permanent magnet synchronous motor is very high to the supply voltage required precision, be operated in supply voltage just in time equal its generation back electromotive force please condition under, power factor is the highest, can reach 1.If supply voltage departs from optimum value, then power factor declines to a great extent, and produces a large amount of reactive powers and line loss.Traditional solution mainly contains two kinds at present: the first adopts the method for reactive power compensation, because three-phase permanent magnet synchronous motor presents capacitive when moving under voltage condition on the low side, and operation the time presents perception under higher voltage condition, therefore compensating circuit needs electric capacitor and two kinds of compensation of reactance, the circuit complexity, the cost height; Because of motor manufacturing technology difference, oil well load difference, voltage fluctuation or factors such as motor is aging, demagnetization, the required compensation rate of each oil-well motor is different, and normal the variation, thus adopt compensation way not meet the demands fully, often take place to mend less than or the situation of making amends for one's faults.It two is to use pressurizer, usually, traditional pressurizer uses preceding by after the artificial setting output voltage stabilizing value, just immobilized, equally because of factors such as motor manufacturing technology difference, oil well load variations, voltage fluctuation or motor are aging, demagnetizations, the back electromotive force of each oil-well motor is different and changes, and motor is cheated be operated in optimum state eventually.And three-phase permanent magnet synchronous motor is very responsive to voltage, and the pressurizer output valve departs from its back electromotive force 2V (being equivalent to 0.5%), and reactive power just obviously increases.
Summary of the invention
In order to overcome the weak point of present technology, main purpose of the present invention provides a kind of by gathering voltage, the current data of motor, automatically calculate real-time voltage, current amplitude with and phase place, power factor, voltage stabilizing value to pressurizer is done real-time adjustment, makes the special-purpose pressurizer of its oil well three-phase permanent magnet synchronous motor that always works in optimum state.
The special-purpose pressurizer of oil well three-phase permanent magnet synchronous motor, it is provided with voltage compensating circuit and telemetry circuit two parts between three power supplys and three-phase permanent-magnetic synchronous motors; Described voltage compensating circuit input inserts into phase voltage circuit (A1 phase, B1 phase, the input of C1 phase three-phase), and output connects phase voltage circuit (A2 phase, B2 phase, the output of C2 phase three-phase); The telemetry circuit input connects phase voltage circuit (A2 phase, B2 phase, C2 phase), and output is connected into voltage compensating circuit.
Described voltage compensating circuit is made up of transformer, voltage regulator, stepping motor, carbon brush; The transformer secondary output coil is connected in the circuitry phase, and slip voltage regulator slidding carbon brush is inserted at the primary coil two ends, and is done relative motion on the slidingtype voltage regulator by stepping motor drive carbon brush;
Described telemetry circuit comprises the STC12C5620AD integrated circuit and the large power triode array integrated circuit ULN2803A that carry out the A/D conversion;
Its circuit structure of telemetry circuit at first each mutually all the mode by two-stage current transformer serial connection insert three and go out phase voltage circuit (A2 phase, B2 phase, C2 phase); Described two-stage current transformer serial connection, be each mutually in, the phase line punching is passed through partial instrument transformer by the instrument transformer of the first order with the secondary wire punching of the first order, more partial secondary wire is linked into 12～14 pins of integrated circuit STC12C5620AD respectively by diode V4～6; 17～15 pins of STC12C5620AD go out phase voltage circuit A2 phase, B2 phase, C2 phase by three of the directly corresponding connections in diode in series V1～3 respectively; STC12C5620AD pin one 2～17 is resistor R 5～10 ground connection by being connected in series respectively; 20 pins of STC12C5620AD and 10 pins of STC12C5620AD connect Switching Power Supply 5V pin respectively; Switching Power Supply 5V pin connects 1 pin of STC12C5620AD through electrochemical capacitor C2, and by the resistor R 1 in parallel afterwards ground connection of electrochemical capacitor C1 with 1 pin that inserts STC12C5620AD; Connect the Colpitts oscillation circuit of forming by crystal oscillator G1 and two capacitor C 3, C4 between 4,5 pins of STC12C5620AD; Corresponding respectively 6,5 pins that connect ULN2803A of 2,3 pins of STC12C5620AD; Corresponding respectively 4,3,2,1 pin that connects ULN2803A of 6,7,8,9 pins of STC12C5620AD; 10 pins of STC12C5620AD and 9 pins of ULN2803A are ground connection respectively; The 18 pin DRA of ULN2803A, 16 pin DRB, 14 pin DRC are connected into A1 phase, the A2 phase of described stepping motor, the DR port of A3 phase respectively; The 17 pin DPA of ULN2803A, 15 pin DPB, 13 pin DPC are connected into A1 phase, the A2 phase of described stepping motor, the DP port of A3 phase respectively.
Described Switching Power Supply inserts A2 phase circuit, zero line N, ground connection in addition; The outlet line of Switching Power Supply control comprises 5V supply line and 24V supply line; 24V supply line inserts the stepping motor in the described voltage compensating circuit.
The invention has the beneficial effects as follows: voltage, the current data of gathering motor automatically, automatically calculate real-time voltage, current amplitude with and phase place, power factor, be higher than or be lower than the best effort point voltage by the indirect judgment task voltage of the phase difference between voltage and electric current, and estimate corresponding load variations, according to these integrated informations, voltage stabilizing value to pressurizer is done real-time adjustment, and the back electromotive force of adaptive tracing motor makes it always work in the state of high power factor.
By fully automatic pressure-stabilizing, the back electromotive force of the electronic three-phase permanent-magnetic synchronous motors of real-time tracking makes oil-field oil pumper can reach very high power factor, raises the efficiency, and reduces reactive loss, increases the electrical network tolerance limit, saves the electricity charge, has high economic benefit; Meet the energy-saving and emission-reduction policy that country advocates simultaneously, have tangible social effect.
Description of drawings
The present invention will be described below in conjunction with Figure of description and embodiment:
Fig. 1 is a structural representation of the present invention,
Fig. 2 is a voltage compensating circuit structural representation of the present invention,
Fig. 3 is a telemetry circuit structural representation of the present invention.
Embodiment
As shown in Figure 1, the special-purpose pressurizer of oil well three-phase permanent magnet synchronous motor, it is provided with voltage compensating circuit and telemetry circuit two parts between three power supplys and three-phase permanent-magnetic synchronous motors; Described voltage compensating circuit input inserts into phase voltage circuit (A1 phase, B1 phase, the input of C1 phase three-phase), and output connects phase voltage circuit (A2 phase, B2 phase, the output of C2 phase three-phase); The telemetry circuit input connects phase voltage circuit (A2 phase, B2 phase, C2 phase), and output is connected into voltage compensating circuit.
Gather voltage, the current parameters of output by measurement and control unit, calculate the operating index of three-phase permanent-magnetic synchronous motors, the difference of estimation output voltage and optimum operating voltage, control voltage compensation unit produces an adjustable size, the variable bucking voltage of polarity, be superimposed upon on the input voltage, reach Adjustable Output Voltage,, make the phase permanent magnet synchronous motor always work in the state of greater efficiency by continuous adjustment.
The operating characteristic of three-phase permanent-magnetic synchronous motors is: most effective when supply voltage equals its back electromotive force just, power factor is 1, at this moment, the phase place unanimity of voltage and current, phase difference is 0; When supply voltage during less than its back electromotive force, efficient step-down, power factor is less than 1, and at this moment, motor is partial to capacitive load, and electric current is with respect to the super previous phase difference of voltage, and reactive power is for negative; When supply voltage during greater than its back electromotive force, efficient step-down, power factor is less than 1, and at this moment, motor is partial to inductive load, and electric current is with respect to phase difference of voltage delay, and reactive power is for just.
Therefore, can judge that indirectly supply voltage is the back electromotive force less than the phase permanent magnet synchronous motor with the method that detects voltage, current and phase difference, still be greater than its back electromotive force, and needn't directly measure the size of back electromotive force.
With a phase in the three-phase (A phase) is example, all the other two-phases in like manner, measurement and control unit detects the phase difference of current of electric with respect to voltage in real time, is made as
When
The time, power factor is
When representing supply voltage less than its back electromotive force, measurement and control unit sends corresponding control signal, makes compensating unit produce a positive voltage, superposes on the line, and output voltage increases; When
The time, power factor is
When representing supply voltage greater than its back electromotive force, measurement and control unit sends corresponding control signal, makes compensating unit produce a negative voltage, superposes on the line, and output voltage reduces; When
The time, power factor is
When representing supply voltage to equal its back electromotive force, measurement and control unit is not sent out control signal, and output voltage is constant.
As shown in Figure 2, described voltage compensating circuit is made up of transformer, voltage regulator, stepping motor, carbon brush; With a phase in the three-phase (A phase) is example, all the other two-phases in like manner, the transformer secondary output coil is connected in the circuitry phase, slip voltage regulator slidding carbon brush is inserted at the primary coil two ends, and drives carbon brush by stepping motor and do relative motion on the slidingtype voltage regulator; Just produce in transformer that adjustable size, polarity are variable, phase place and the corresponding to driving voltage of A1, so, in transformer outlet side secondary coil, just produce a bucking voltage, be superimposed upon on the A1 phase line, form output phase voltage A2.
As shown in Figure 3, described telemetry circuit comprises a STC12C5620AD integrated circuit and a large power triode array integrated circuit ULN2803A who carries out the A/D conversion;
Its circuit structure of telemetry circuit at first each mutually all the mode by two-stage current transformer serial connection insert three and go out phase voltage circuit (A2 phase, B2 phase, C2 phase); Described two-stage current transformer serial connection, be each mutually in, the phase line punching is passed through partial instrument transformer with the secondary wire punching of the first order again by the instrument transformer of the first order, more partial secondary wire is linked into 12～14 pins of integrated circuit STC12C5620AD respectively by diode V4～6; 17～15 pins of STC12C5620AD go out phase voltage circuit A2 phase, B2 phase, C2 phase by three of the directly corresponding connections in diode in series V1～3 respectively; STC12C5620AD pin one 2～17 is resistor R 5～10 ground connection by being connected in series respectively; 20 pins of STC12C5620AD and 10 pins of STC12C5620AD connect Switching Power Supply 5V pin respectively; Switching Power Supply 5V pin connects 1 pin of STC12C5620AD through electrochemical capacitor C2, and by the resistor R 1 in parallel afterwards ground connection of electrochemical capacitor C1 with 1 pin that inserts STC12C5620AD; Connect the Colpitts oscillation circuit of forming by crystal oscillator G1 and two capacitor C 3, C4 between 4,5 pins of STC12C5620AD; Corresponding respectively 6,5 pins that connect ULN2803A of 2,3 pins of STC12C5620AD; Corresponding respectively 4,3,2,1 pin that connects ULN2803A of 6,7,8,9 pins of STC12C5620AD; 10 pins of STC12C5620AD and 9 pins of ULN2803A are ground connection respectively; The 18 pin DRA of ULN2803A, 16 pin DRB, 14 pin DRC are connected into A1 phase, the A2 phase of described stepping motor, the DR port of A3 phase respectively; The 17 pin DPA of ULN2803A, 15 pin DPB, 13 pin DPC are connected into A1 phase, the A2 phase of described stepping motor, the DP port of A3 phase respectively.
Described Switching Power Supply inserts A2 phase circuit, zero line N, ground connection in addition; The outlet line of Switching Power Supply control comprises 5V supply line and 24V supply line; 24V supply line inserts the stepping motor in the described voltage compensating circuit.
Current transformer can be matched according to actual conditions, and requirement is when maximum current, is no more than 5V at the voltage of integrated circuit side input.For example: two-stage current transformer serial connection, the ratio of one-level is 100: 5, during promptly elementary 100A, the electric current of secondary generation 5A, the secondary choosing be 2500: 1 instrument transformer, the electric current that is about to 5A becomes 2mA again.If the electric current on phase line is 100A, then producing effective value in the integrated circuit side is the alternating voltage of 2V, and its half-wave peak value is about 2.8V, and less than 5V, purpose is in order to avoid overtension damages integrated circuit.Three road current signals are input to 12～14 pin of integrated circuit STC12C5620AD respectively, carry out the A/D conversion, analog signal are become digital signal, for subsequent treatment.
Phase line voltage becomes the alternation voltage less than 5V by resistance R 2～4 dividing potential drops, is input to 15～17 pin of integrated circuit STC12C5620AD, carries out the A/D conversion, analog signal is become digital signal, for subsequent treatment.
Integrated circuit STC12C5620AD is the high-speed microprocessor of a compatible 80C51 instruction set, built-in 8 tunnel 10 A/D converters; ULN2803A is a large power triode array integrated circuit.
The model that stepping motor selects for use direct current 24V to drive, DR is direction control, motor just changes during high level, reverses during low level; DP is the pulse input, pulse of every input, and stepping motor rotates an angle, and step pitch can be set between 1/100000～1/360 circle.
One, regular service conditions
1. height above sea level is no more than 1000m;
2. ambient temperature is-25 ℃～+ 50 ℃;
3. relative humidity is no more than 90% (20 ℃);
4. the operation infield does not have conduction and blast dust, the gas or the steam of no corroding metal or destruction insulation;
Frequency of input voltage fluctuation be no more than ± 2%;
6. the input voltage degree of asymmetry of three-phase pressurizer is not more than 10%, and the degree of asymmetry of load current is not more than 10%;
7. the relative harmonic content of input voltage waveform is no more than 10%;
8. the installation site should not have tangible vibrations and impact.
Two, basic mechanical design feature
1. input voltage range: 304V～456V;
2. output voltage: 385～400V can set arbitrarily;
3. lasting accuracy: ± 1.5%;
4. operating frequency: 50/60Hz;
5. dielectric strength: power frequency 2000V, 1 minute;
6. insulation resistance: greater than 2M Ω;
7. overvoltage protection voltage: 418 ± 4V; Under-voltage protection voltage 342 ± 4V.
Claims (4)
1. the special-purpose pressurizer of oil well three-phase permanent magnet synchronous motor is characterized in that: between three power supplys and the three-phase permanent-magnetic synchronous motors, voltage compensating circuit and telemetry circuit two parts are set; Described voltage compensating circuit input inserts into phase voltage circuit (A1 phase, B1 phase, the input of C1 phase three-phase), and output connects phase voltage circuit (A2 phase, B2 phase, the output of C2 phase three-phase); The telemetry circuit input connects phase voltage circuit (A2 phase, B2 phase, C2 phase), and output is connected into voltage compensating circuit.
2. the special-purpose pressurizer of oil well three-phase permanent magnet synchronous motor according to claim 1, it is characterized in that: described voltage compensating circuit is made up of transformer, voltage regulator, stepping motor, carbon brush; The transformer secondary output coil is connected in the circuitry phase, and slip voltage regulator slidding carbon brush is inserted at the primary coil two ends, and is done relative motion on the slidingtype voltage regulator by stepping motor drive carbon brush;
3. the special-purpose pressurizer of oil well three-phase permanent magnet synchronous motor according to claim 1 is characterized in that: described telemetry circuit comprises the STC12C5620AD integrated circuit and the large power triode array integrated circuit ULN2803A that carry out the A/D conversion;
Its circuit structure of telemetry circuit at first each mutually all the mode by two-stage current transformer serial connection insert three and go out phase voltage circuit (A2 phase, B2 phase, C2 phase); Described two-stage current transformer serial connection, be each mutually in, the phase line punching is by the instrument transformer of the first order, again the secondary wire punching of the first order is passed through partial instrument transformer, more partial secondary wire is linked into (12～14) pin of integrated circuit STC12C5620AD respectively by diode (V4～6); (17～15) pin of STC12C5620AD goes out phase voltage circuit (A2 phase, B2 phase, C2 phase) by three of the directly corresponding connections of diode in series (V1～3) respectively; STC12C5620AD pin (12～17) is resistor (R5～10) ground connection by being connected in series respectively; (10) pin of (20) pin of STC12C5620AD and STC12C5620AD connects Switching Power Supply 5V pin respectively; Switching Power Supply 5V pin connects STC12C5620AD (1) pin through electrochemical capacitor (C2), and by electrochemical capacitor (C1) and the resistor (R1) that inserts STC12C5620AD (1) pin back in parallel ground connection; Connect the Colpitts oscillation circuit of forming by crystal oscillator (G1) and two electric capacity (C3, C4) between (4,5) pin of STC12C5620AD; Corresponding respectively (6), (5) pin that connects ULN2803A of (2) of STC12C5620AD, (3) pin; Corresponding respectively (4), (3), (2), (1) pin that connects ULN2803A of (6) of STC12C5620AD, (7), (8), (9) pin; (9) pin of (10) pin of STC12C5620AD and ULN2803A is ground connection respectively; (18) pin DRA of ULN2803A, (16) pin DRB, (14) pin (DRC) are connected into (A1) phase, (A2) phase of described stepping motor, the DR port of (A3) phase respectively; (17) pin DPA of ULN2803A, (15) pin DPB, (13) pin DPC are connected into (A1) phase, (A2) phase of described stepping motor, the DP port of (A3) phase respectively.
4. the special-purpose pressurizer of oil well three-phase permanent magnet synchronous motor according to claim 3, it is characterized in that: described Switching Power Supply inserts (A2) phase circuit, zero line (N), in addition ground connection; The outlet line of Switching Power Supply control comprises 5V supply line and 24V supply line; 24V supply line inserts the stepping motor in the described voltage compensating circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010262174 CN101950967B (en) | 2010-08-25 | 2010-08-25 | Special voltage stabilizer for three-phase permanent magnet synchronous motor (PMSM) for producing well in oil field |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010262174 CN101950967B (en) | 2010-08-25 | 2010-08-25 | Special voltage stabilizer for three-phase permanent magnet synchronous motor (PMSM) for producing well in oil field |
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| Publication Number | Publication Date |
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| CN101950967A true CN101950967A (en) | 2011-01-19 |
| CN101950967B CN101950967B (en) | 2012-12-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108063570A (en) * | 2018-01-22 | 2018-05-22 | 安图实验仪器(郑州)有限公司 | Stepper motor torque self_adaptive adjusting system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09205800A (en) * | 1996-01-26 | 1997-08-05 | Mitsubishi Electric Corp | Exciter for rotary electric machine |
| CN101656420A (en) * | 2009-09-09 | 2010-02-24 | 西安兴汇电力科技有限公司 | Reactive compensation type intelligent voltage regulator |
| CN101667732A (en) * | 2009-10-21 | 2010-03-10 | 秦山核电有限公司 | Isolation transformer type multi-level voltage output mobile three-phase voltage-stabilizing power supply |
-
2010
- 2010-08-25 CN CN 201010262174 patent/CN101950967B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09205800A (en) * | 1996-01-26 | 1997-08-05 | Mitsubishi Electric Corp | Exciter for rotary electric machine |
| CN101656420A (en) * | 2009-09-09 | 2010-02-24 | 西安兴汇电力科技有限公司 | Reactive compensation type intelligent voltage regulator |
| CN101667732A (en) * | 2009-10-21 | 2010-03-10 | 秦山核电有限公司 | Isolation transformer type multi-level voltage output mobile three-phase voltage-stabilizing power supply |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108063570A (en) * | 2018-01-22 | 2018-05-22 | 安图实验仪器(郑州)有限公司 | Stepper motor torque self_adaptive adjusting system |
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Effective date of registration: 20180611 Address after: 100089 room 213, block C, 35 Hospital of Ba Gou Road, Haidian District, Beijing. Patentee after: Beijing Zhongtian Hua Yan Technology Co., Ltd. Address before: 252000 No. 2 building, North Garden District, No. 166 Zhan Qian street, Dongchangfu District, Liaocheng, Shandong 306 Patentee before: Wang Minghe |
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Granted publication date: 20121226 Termination date: 20180825 |