CN106194811B - The operation control system and control method of magnetic suspension centrifugal aeration air blower - Google Patents
The operation control system and control method of magnetic suspension centrifugal aeration air blower Download PDFInfo
- Publication number
- CN106194811B CN106194811B CN201610851847.XA CN201610851847A CN106194811B CN 106194811 B CN106194811 B CN 106194811B CN 201610851847 A CN201610851847 A CN 201610851847A CN 106194811 B CN106194811 B CN 106194811B
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- Prior art keywords
- air blower
- magnetic suspension
- suspension centrifugal
- aeration air
- centrifugal aeration
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/003—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by throttling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/007—Conjoint control of two or more different functions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/008—Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2270/00—Control
- F05D2270/01—Purpose of the control system
- F05D2270/02—Purpose of the control system to control rotational speed (n)
- F05D2270/024—Purpose of the control system to control rotational speed (n) to keep rotational speed constant
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2270/00—Control
- F05D2270/30—Control parameters, e.g. input parameters
- F05D2270/304—Spool rotational speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2270/00—Control
- F05D2270/30—Control parameters, e.g. input parameters
- F05D2270/306—Mass flow
- F05D2270/3061—Mass flow of the working fluid
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The operation control system and control method of magnetic suspension centrifugal aeration air blower of the present invention, wherein operation control system includes electric-control system, flow collection sensor, pressure sensor, blow valve, pipe network system and aeration pond, flow collection sensor is located at the entrance of magnetic suspension centrifugal aeration air blower, pressure sensor is located at the exit of magnetic suspension centrifugal aeration air blower, the exit of magnetic suspension centrifugal aeration air blower is connected with outlet pipe, outlet pipe includes main line and branch line, blow valve is built in branch line, it is responsible for connecting pipe net system, pipe network system extends in aeration pond, flow collection sensor, pressure sensor and blow valve are connected on electric-control system.The present invention adjusts opening and closing and the motor speed of blow valve by the judgement to magnetic suspension centrifugal aeration air blower operating condition, to ensure that magnetic suspension centrifugal aeration air blower can normally start, runs and stop, high degree of automation.
Description
Technical field：
The present invention relates to the operation control system of magnetic suspension centrifugal aeration air blower and control methods, belong to frequency conversion magnetic
Suspension air blower field.
Background technology：
In water treatment field, traditional aeration is manual operation switch machine with cfentrifugal blower, needs multidigit experienced
Operator coordinates completion to power on, opens blow valve simultaneously, closes the actions such as blow valve, shutdown, complicated for operation there is also operation error
Risk.Especially some special circumstances, for example, piping volume it is larger or smaller, lead to have product in pipeline due to aeration head leak
Water is required for determining sequence, the stand-by period etc. of each action according to various actual conditions, once there is unexpected be easy in operation
There are the danger such as surge, blower fault, and in the operational process of wind turbine, it is difficult to realize according to load situation of change to wind
Amount is adjusted in real time.With the development of electronics and mechanical technique, occur a new generation aeration blower --- magnetcisuspension floats off
Core type air blower, the air blower are managed concentratedly by central die, are easy to implement intelligent control.Blow valve can be placed in drum by the product
Whether blower interior is automatically brought into operation the switch of blow valve according to operation process needs, to having ponding to have in piping volume and pipeline
Well adapting to property is truly realized start ＆ shutdown through one key.In normal course of operation, user can conveniently adjust air blower flow, and
It can be according to load variation automatic adjustment.It is trend of the times to replace conventional centrifugal air blower with magnetic suspension cfentrifugal blower.
Present invention combination magnetic suspension cfentrifugal blower own characteristic, water treatment aeration technique need and different user is common
Special circumstances, formulated magnetic suspension centrifugal aeration air blower from booting to shutdown progress control method.
Invention content：
The present invention provides a kind of operation control system and control method of magnetic suspension centrifugal aeration air blower, simplifies magnetcisuspension
The operating process of floating centrifugal aeration blower ensures magnetic suspension centrifugal aeration air blower safe and stable operation.
The present invention adopts the following technical scheme that：A kind of operation control system of magnetic suspension centrifugal aeration air blower, including
Electric-control system, flow collection sensor, pressure sensor, blow valve, pipe network system and aeration pond, flow collection sensor
Positioned at the entrance of magnetic suspension centrifugal aeration air blower, pressure sensor is located at the outlet of magnetic suspension centrifugal aeration air blower
Place, the exit of magnetic suspension centrifugal aeration air blower are connected with outlet pipe, and outlet pipe includes main line and branched pipe
Road, blow valve are built in branch line, are responsible for connecting pipe net system, and pipe network system extends in aeration pond, and flow is adopted
Collection sensor, pressure sensor and blow valve are connected on electric-control system.
The present invention also adopts the following technical scheme that a kind of progress control method of magnetic suspension centrifugal aeration air blower wraps
Include following steps：
(1) after being switched on, it is first turned on blow valve, the electric motor starting in magnetic suspension centrifugal aeration air blower, rotating speed is opened by 0
Beginning is gradually increased to rated speed；
(2) in boosting velocity procedure, the entrance stream of magnetic suspension centrifugal aeration air blower is acquired by flow collection sensor
Amount, and flow signal is transmitted to electric-control system, the entrance flow of magnetic suspension centrifugal aeration air blower is judged, when flow reaches
When setting flow, blow valve is closed；
(3) if when rotating speed reaches rated speed, and the flow of magnetic suspension centrifugal aeration air blower entrance does not still have
Have that when reaching setting flow, alarm is shut down and provided to magnetic suspension centrifugal aeration air blower, prompt magnetcisuspension floating centrifugal aeration drum
The outlet pressure of wind turbine is excessively high, and operating personnel restart booting after checking system；
(4) the subsequent speed of continuing rising of blow valve is closed to rated speed, and judges the outlet of magnetic suspension centrifugal aeration air blower
Locate the situation of change of pressure, if the outlet pressure of magnetic suspension centrifugal aeration air blower changing value in 5 seconds is less than setting
Value, then motor boosting velocity procedure terminates, into normal operation state；
(5) if after closing blow valve, before not entering normal operation state, magnetcisuspension floating centrifugal aeration drum is detected
Flow at fan inlet is less than Surging flow, is again turned on blow valve, magnetic suspension centrifugal aeration air blower enters draining mould
Formula：Motor speed is adjusted to draining rotating speed, and operation is re-closing off blow valve after 2 minutes, into normal operation state；
(6) when normal operation state, according to the outlet pressure and electricity of current magnetic suspension centrifugal aeration air blower
Blower performance curve graph in control system (1) calculates the entrance minimum allowable operation of magnetic suspension centrifugal aeration air blower
Flow and maximum allowable operating flux are divided into 100 parts, and user adjusts flow by setting percentage, if magnetic suspension
The outlet pressure of centrifugal aeration air blower changes, and magnetic suspension centrifugal aeration air blower is ensured practical by rotational speed regulation
Flow is consistent with setting flow；
(7) when pressing power-off button, blow valve is first opened, rotating speed is down to the cooling rotating speed of setting, operation waits for magnetic after 3 minutes
Motor reduction to 0 is completed into shutdown again after the cooling of suspension centrifugal aeration blower motor.
The present invention has the advantages that：The present invention is by sentencing magnetic suspension centrifugal aeration air blower operating condition
It is disconnected, the opening and closing of blow valve and motor speed in magnetic suspension centrifugal aeration air blower are adjusted, to ensure that magnetcisuspension floating centrifugal is aerated
Air blower can normally start, runs and stop, high degree of automation, reduce manual operation load, be suitable for commercial introduction.
Description of the drawings：
Fig. 1 is the operation control system figure of magnetic suspension centrifugal aeration air blower of the present invention.
Fig. 2 is the progress control method figure of magnetic suspension centrifugal aeration air blower of the present invention.
Specific implementation mode：
It please refers to shown in Fig. 1, the operation control system of magnetic suspension centrifugal aeration air blower of the present invention includes electric-control system
1, flow collection sensor 3, pressure sensor 4, blow valve 5, pipe network system 6 and aeration pond 7, flow collection sensor 3
Positioned at the entrance of magnetic suspension centrifugal aeration air blower, pressure sensor 4 is located at going out for magnetic suspension centrifugal aeration air blower
At mouthful, the exit of magnetic suspension centrifugal aeration air blower is connected with outlet pipe, and outlet pipe includes main line and branch
Pipeline, blow valve 5 are built in branch line, and supervisor's connecting pipe net system 6, pipe network system 6 extends in aeration pond 7,
Flow collection sensor 3, pressure sensor 4 and blow valve 5 are connected on electric-control system 1.
It please refers to shown in Fig. 2, the progress control method of magnetic suspension centrifugal aeration air blower of the present invention, including walks as follows
Suddenly：
(1) after being switched on, it is first turned on blow valve 5, the electric motor starting in magnetic suspension centrifugal aeration air blower, rotating speed is by 0
Start to be gradually increased to rated speed, the outlet air of magnetic suspension centrifugal aeration air blower is directly arranged by the branch line of placement blow valve
Go out；
(2) stream of the entrance of magnetic suspension centrifugal aeration air blower is acquired in boosting velocity procedure by flow collection sensor
Amount, and flow signal is transmitted to electric-control system 1, judge the flow of the entrance of magnetic suspension centrifugal aeration air blower, works as flow
When reaching setting flow, blow valve 5 is closed, magnetic suspension centrifugal aeration air blower outlet air enters main line；
(3) if when rotating speed reaches rated speed, and the flow of the entrance of magnetic suspension centrifugal aeration air blower is still
When not reaching setting flow, alarm is shut down and provided to magnetic suspension centrifugal aeration air blower, prompts magnetcisuspension floating centrifugal aeration
The outlet pressure of air blower is excessively high, and operating personnel restart booting after checking system；
(4) the subsequent speed of continuing rising of blow valve 5 is closed to rated speed, and judges the outlet of magnetic suspension centrifugal aeration air blower
Locate the situation of change of pressure, if the outlet pressure of magnetic suspension centrifugal aeration air blower changing value in 5 seconds is less than setting
Value, then show that magnetic suspension centrifugal aeration air blower is smoothly aerated, then motor boosting velocity procedure terminates, and is transported into normal work
Row state, the gas that magnetic suspension centrifugal aeration air blower exposes enter aeration pond 7 by pipe network system 6；
(5) if after closing blow valve 5, before not entering normal operation state, detect that magnetcisuspension floating centrifugal is aerated
Flow at blower inlet is less than Surging flow, it may be possible to be aerated aeration head or pipeline of the water in pond 7 by rupture
It penetrates into pipe network system 6, water occupies certain pipeline area, and flow is caused to be decreased to Surging flow.At this point, being again turned on blow valve
5, magnetic suspension centrifugal aeration air blower enters discharging mode, and motor speed is adjusted to draining rotating speed, runs 2 points by electric-control system 1
Zhong Hou, by pipe network system 6 ponding discharge after, after be re-closing off blow valve 5, into normal operation state；
(6) when normal operation state, according to the outlet pressure and electricity of current magnetic suspension centrifugal aeration air blower
Blower performance curve graph in control system 1 calculates the entrance minimum allowable operation stream of magnetic suspension centrifugal aeration air blower
Amount and maximum allowable operating flux are divided into 100 parts, and user adjusts flow by setting percentage, if magnetcisuspension floats off
The outlet pressure of core type aeration blower changes, and magnetic suspension centrifugal aeration air blower ensures practical stream by rotational speed regulation
Amount is consistent with setting flow；
(7) when pressing power-off button, blow valve 5 is first opened, the outlet air of magnetic suspension centrifugal aeration air blower is straight by blow valve 5
Run in, rotating speed be down to the cooling rotating speed of setting, operation 3 minutes after the cooling of magnetic suspension centrifugal aeration air blower motor again
By motor reduction to 0, shutdown is completed.
The progress control method of magnetic suspension centrifugal aeration air blower of the present invention does not have to distinguish magnetic suspension in boosting velocity procedure
6 volume size of pipe network system of centrifugal aeration air blower, without judging whether magnetic suspension centrifugal aeration air blower has been opened
Begin aeration, only need to control the closing of blow valve by judging whether flow reaches setting flow, the scope of application is wider, operates more
It is convenient.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
It for member, can also make several improvements without departing from the principle of the present invention, these improvement also should be regarded as the present invention's
Protection domain.
Claims (1)
1. a kind of progress control method of magnetic suspension centrifugal aeration air blower, the fortune of the magnetic suspension centrifugal aeration air blower
Row control system, including electric-control system（1）, flow collection sensor（3）, pressure sensor（4）, blow valve（5）, pipe network system
（6）And aeration pond（7）, flow collection sensor（3）Positioned at the entrance of magnetic suspension centrifugal aeration air blower, pressure passes
Sensor（4）Positioned at the exit of magnetic suspension centrifugal aeration air blower, the exit of magnetic suspension centrifugal aeration air blower connects
It includes main line and branch line, blow valve to have outlet pipe, outlet pipe（5）It is built in inside blower equipment, is in
On branch line, it is responsible for connecting pipe net system（6）, pipe network system（6）Extend to aeration pond（7）In, flow collection sensing
Device（3）, pressure sensor（4）And blow valve（5）It is connected to electric-control system（1）On, which is characterized in that include the following steps：
（1）After booting, it is first turned on blow valve（5）, the electric motor starting in magnetic suspension centrifugal aeration air blower, rotating speed opened by 0
Beginning is gradually increased to rated speed；
（2）In boosting velocity procedure, the entrance flow of magnetic suspension centrifugal aeration air blower is acquired by flow collection sensor, and
Flow signal is transmitted to electric-control system（1）, judge the entrance flow of magnetic suspension centrifugal aeration air blower, set when flow reaches
When constant flow, blow valve is closed（5）；
（3）If when rotating speed reaches rated speed, and the flow of magnetic suspension centrifugal aeration air blower entrance does not still reach
When to setting flow, alarm is shut down and provided to magnetic suspension centrifugal aeration air blower, prompts magnetic suspension centrifugal aeration air blower
Outlet pressure it is excessively high, operating personnel restart booting after checking system；
（4）Close blow valve（5）Subsequent speed of continuing rising judges the exit of magnetic suspension centrifugal aeration air blower to rated speed
The situation of change of pressure, if the outlet pressure of magnetic suspension centrifugal aeration air blower changing value in 5 seconds is less than setting value,
Then motor boosting velocity procedure terminates, into normal operation state；
（5）If closing blow valve（5）Afterwards, before not entering normal operation state, magnetcisuspension floating centrifugal aeration drum is detected
Flow at fan inlet is less than Surging flow, is again turned on blow valve（5）, magnetic suspension centrifugal aeration air blower enters draining
Pattern：Motor speed is adjusted to draining rotating speed, and operation is re-closing off blow valve after 2 minutes（5）, into normal operation shape
State；
（6）When normal operation state, according to the outlet pressure of current magnetic suspension centrifugal aeration air blower and automatically controlled system
System（1）Interior blower performance curve graph calculates the entrance minimum allowable operating flux of magnetic suspension centrifugal aeration air blower
With maximum allowable operating flux, 100 parts are divided into, user adjusts flow by setting percentage, if magnetic suspension centrifuges
The outlet pressure of formula aeration blower changes, and magnetic suspension centrifugal aeration air blower ensures actual flow by rotational speed regulation
It is consistent with setting flow；
（7）When by power-off button, blow valve is first opened（5）, rotating speed is down to the cooling rotating speed of setting, operation waits for magnetic after 3 minutes
Motor reduction to 0 is completed into shutdown again after the cooling of suspension centrifugal aeration blower motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610851847.XA CN106194811B (en) | 2016-09-26 | 2016-09-26 | The operation control system and control method of magnetic suspension centrifugal aeration air blower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610851847.XA CN106194811B (en) | 2016-09-26 | 2016-09-26 | The operation control system and control method of magnetic suspension centrifugal aeration air blower |
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| Publication Number | Publication Date |
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| CN106194811A CN106194811A (en) | 2016-12-07 |
| CN106194811B true CN106194811B (en) | 2018-08-21 |
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106704241B (en) * | 2017-02-27 | 2018-02-02 | 杭州志驱传动技术有限公司 | A kind of blower fan control method for stably operating |
| CN107620729A (en) * | 2017-09-26 | 2018-01-23 | 亿昇(天津)科技有限公司 | A kind of magnetic suspension centrifugal blower anti-surge control method |
| CN107827251B (en) * | 2017-10-31 | 2020-09-04 | 亿昇(天津)科技有限公司 | Anti-surge control method for centrifugal blower |
| CN107885158B (en) * | 2017-12-19 | 2023-10-31 | 山东天瑞重工有限公司 | Electrical control device of magnetic suspension high-speed centrifugal blower |
| CN108035905A (en) * | 2018-01-08 | 2018-05-15 | 长兴埃克森科技有限公司 | A kind of automatic frequency-conversion control system for preventing wind turbine surge |
| CN108640264B (en) * | 2018-05-10 | 2020-08-28 | 刘子琪 | Aeration system and aeration method for water tank |
| CN110725807B (en) * | 2019-10-10 | 2020-10-30 | 佛山格尼斯磁悬浮技术有限公司 | Self-adaptive switching method, device and system for operation modes and magnetic suspension blower |
| CN111828365A (en) * | 2020-07-28 | 2020-10-27 | 重庆通用工业(集团)有限责任公司 | Operation control system of variable-frequency direct-drive air blower |
| CN112901544A (en) * | 2021-01-25 | 2021-06-04 | 大连理工大学 | Intelligent control system and control method for air suspension aeration fan based on oxygen content requirement of sewage pool |
| CN113342072B (en) * | 2021-07-07 | 2023-04-14 | 精效悬浮(苏州)科技有限公司 | Constant flow control method and system |
| CN113623260B (en) * | 2021-09-10 | 2023-05-09 | 中车大连机车研究所有限公司 | Magnetic suspension blower air volume curve fitting and air volume rotating speed stable switching control method |
| CN117108540B (en) * | 2023-10-12 | 2023-12-19 | 山东天瑞重工有限公司 | Anti-surge pressure-maintaining control method and system for magnetic suspension blower |
| CN117553027A (en) * | 2024-01-11 | 2024-02-13 | 山东天瑞重工有限公司 | Testing method and testing equipment for magnetic suspension blower |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06288390A (en) * | 1993-04-06 | 1994-10-11 | Hitachi Ltd | Operation control method of turbo blower or compressor piping system |
| KR100812011B1 (en) * | 2001-12-26 | 2008-03-10 | 주식회사 포스코 | Apparatus for surge protection control of blower in blast furnace and the same method |
| CN102352866A (en) * | 2011-10-29 | 2012-02-15 | 无锡宝南机器制造有限公司 | Anti-surge control device of blower |
| CN203939745U (en) * | 2014-06-19 | 2014-11-12 | 首钢京唐钢铁联合有限责任公司 | A kind of blower surge automatic control system |
| CN206071929U (en) * | 2016-09-26 | 2017-04-05 | 南京磁谷科技有限公司 | The operation control system of magnetic suspension centrifugal aeration air blower |
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Address after: No. 99, Jinxin Middle Road, Jiangning District, Nanjing City, Jiangsu Province Patentee after: Nanjing Cigu Technology Co., Ltd Address before: Nine No. 211102 Bamboo Road, Jiangning Development Zone, Nanjing, Jiangsu, 100 Patentee before: NANJING CIGU LIMITED Corp. |
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