CN104180465A - Fresh air ventilating device with self cleaning and dedusting function and dedusting method of fresh air ventilating device - Google Patents
Fresh air ventilating device with self cleaning and dedusting function and dedusting method of fresh air ventilating device Download PDFInfo
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- CN104180465A CN104180465A CN201310202525.9A CN201310202525A CN104180465A CN 104180465 A CN104180465 A CN 104180465A CN 201310202525 A CN201310202525 A CN 201310202525A CN 104180465 A CN104180465 A CN 104180465A
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Abstract
The invention relates to the field of ventilation, and discloses a fresh air ventilating device with a self cleaning and dedusting function. The fresh air ventilating device comprises an execution unit, a detection unit, a controller and an air source unit, wherein the detection unit is used for converting the environment quantity related to self cleaning and dedusting and the working state physical quantity of a system component into electric quantity and conditioning the electric quantity into an electric quantity signal which is compatible with the controller for being transmitted to the controller; the execution unit refers to execution components related to the self cleaning and dedusting, a driving circuit and a driving mechanism of the execution components, the execution unit is mainly used for enabling all execution components to work cooperatively according to an operation result of a control strategy under the regulation action of the controller and realizing the self cleaning and dedusting function on a filter screen; the controller is a microprocessor and has the main functions of collecting and processing the environment quantity and the system work state information of the detection unit at regular times, carrying out operation evaluation on a trend and a result of a dust accumulation process of the filter screen according to a dedusting strategy and outputting different dedusting control modes to filter screen dust accumulation situations in different degrees or different types. The invention also discloses a self cleaning and dedusting method using the fresh air ventilating device. The fresh air ventilating device and the self cleaning and dedusting method, disclosed by the invention, have the advantages that in-time and efficient dedusting can be carried out, and the energy source is saved.
Description
Technical field
The present invention relates to ventilation field, especially relate to and a kind ofly can carry out intellectuality to the overall process of filter screen and control, thus the new wind ventilation unit and the dust collection method thereof that by scan-type, carry out self-cleaning dedusting.
Background technology
Along with the fast development of social economy and the communications industry, a large amount of communication base stations builds up and puts into effect, and air-conditioning power consumption and the power saving of machine room have caused the common concern of the whole society.For response national energy-saving reduces discharging policy, reduce communication base station operation cost, Intelligent ventilating system is brought into use in newly-built or transformation base station in a large number at present, makes the inside and outside air in base station carry out convection current and heat exchange, to reach air-conditioning open-interval object in good time minimizing base station.Intelligent fresh air system is directly introduced outdoor new wind and is carried out heat exchange, and heat exchange efficiency is high, can save 30%～80% (determining according to different base station environment) of the annual energy consumption of base station air conditioner.But in practical application, the shortcoming of this system also clearly: because outdoor air is directly introduced indoor, the easily dirty easy loss of the filter screen of fresh air energy-saving system, the VMC that is particularly located in the serious region of dust storm or is seated in the mobile base stations, the frequent location of airborne dust such as road limit is just imitated filter screen, very easily by foreign material such as airborne dust, catkin and leaves, stopped up, the time, longer obstruction was more serious.Filter screen is covered after obstruction by foreign matters such as laying dusts; can have a strong impact on air quantity and heat-exchange capacity; need artificial timed patrol and replacing filter screen frequently; cause the increase of cost of labor and screen replacing cost; some remote districts particularly; human cost is expensive, and maintenance is wasted time and energy, if but safeguard that words not in time also usually can cause machine room temperatures involved communication equipment normally to work.
Summary of the invention
For overcoming the filter screen of new air cooling system in traditional machine room, by foreign matters such as laying dusts, covered the shortcoming that causes cost of labor and screen replacing cost to increase after obstruction, provide a kind of can be by air ambient amount and ventilating system state be detected, and comprehensively analyze detection signal, thereby the laying dust amount of filter screen, laying dust trend are made to assessment in advance, select corresponding control strategy, the various laying dust situations of filter screen are adopted to new wind ventilation unit and the dust collection method thereof of varying strength.
The object of the invention is to realize by following technical measures, the new wind ventilation unit of the self-cleaning dedusting function of a kind of tool, comprises performance element, detecting unit, controller and gas source unit;
Described performance element comprise by outdoor air send into indoor pressure fan, be arranged on described pressure fan air inlet a screen pack, be arranged at a MOD of the air inlet of described pressure fan, also comprise and be arranged on the dust removal head of screen pack medial surface, the driving mechanism of driving dust removal head work, described screen pack inner side is provided with vertical its surperficial shower nozzle that points to, and described shower nozzle connects gas source unit by a magnetic valve pipe;
Described detecting unit comprises and is arranged on outdoor air humidity sensor, air-temperature sensor, koniology concentration sensor, be arranged on the baroceptor of described screen pack two side faces, and be arranged on rotation speed of fan sensor on described blower fan, be arranged on described air door throttle opening sensor, be arranged on described driving mechanism position sensor, be arranged on the testing circuit on described driving mechanism circuit;
Described controller is electrically connected each sensor and the testing circuit of detecting unit, for receiving the information of collection and selecting dedusting scheme according to associated information calculation; Described controller is electrically connected performance element and gas source unit, for each parts and gas source unit transmission operation or the stop signal to performance element according to the dedusting scheme of selecting.
Concrete, described gas source unit is air pump or the compression gas tank that pipe connects described shower nozzle.
As a kind of optimal way of enhanced dedusting, described screen pack place is also provided with the ultrasonic transducer that is controlled by controller.
As a kind of optimal way of dehumidifying, on the air flue between the outlet of described gas source unit and shower nozzle, be provided with a heater that is controlled by controller.
The invention also discloses a kind of self-cleaning dust collection method that uses above-mentioned new wind ventilation unit, comprise the steps:
101, device start and initialization;
102, controller receives the Information Monitoring that detecting unit sends on schedule;
103, judgement comprises whether the environment parameter of air humidity, temperature, koniology concentration surpasses scheduled volume, is, jumps to 201, no, carries out 104;
104, whether the draught head that judges filter screen two side faces surpasses scheduled volume, is, jumps to 106, no, carries out 105;
105, judge that whether the times of collection of this collection period is identical with pre-determined number, be, carry out 106, no, times of collection adds 1 and jump to 102;
106, controller is added up this collection period environment parameter, by the draught head of filter screen air quantity, filter screen two side faces, is calculated the laying dust increment of this collection period, goes out the state parameter of this collection period by weighted calculation;
Whether the state parameter that 107, judges this collection period in predetermined dedusting state parameter, be, carries out next step, no, times of collection zero clearing jump to 102;
112, start dust removal head and shower nozzle work;
113, whether the working time that judges dust removal head and shower nozzle work surpasses the time in the state parameter of this collection period, is, carries out 114, no, continues to carry out 113;
114, step 107 quits work to each equipment of start in step 112, and times of collection zero clearing also jumps to 102;
201, environment parameter overload alarm device are shut down.
As a kind of optimal way of enhanced dedusting, described step 107 is rear further comprising the steps of:
Whether the state parameter that 108, judges this collection period in predetermined ultrasonic dedusting state parameter, be, carries out 109, no, skips 109 execution next steps;
109, start ultrasonic wave assisted dust-collecting, and carry out next step.
As a kind of optimal way of dehumidifying, described step 112 is front further comprising the steps of:
Whether the state parameter that 110, judges this collection period in predetermined dehumidifying state parameter, be, carries out 111, no, jumps to 112;
111, start heater, and carry out 112.
The calculating of laying dust increment can be: in the unit interval that experimentation is obtained, the characteristic relation discretization of laying dust increment and dust concentration and ventilation is made two-dimensional data table, be defined as and hold in the power down nonvolatile storage that dirt coefficient is kept at controller, T holding dirt coefficient Ld and can table look-up and obtain by the dust concentration in this period and air quantity in the time, thereby laying dust increment Delta S can be obtained with holding the amassing of dirt coefficient by the time, i.e. Δ S=T*Ld.
The calculating computing formula of laying dust increment can be also:
ΔS＝TD*10
-3Qη；
Wherein: the laying dust increment of Δ S-T time Inner filter net, unit is g;
T-time value, unit is h;
The average dust concentration in D-T time Inner filter net outside, unit is mg/m
3;
In the Q-T time, by the average air quantity of filter screen, unit is m
3/ h;
The heavy efficiency of meter of η-filter screen.
Computing formula by filter screen air quantity is:
Wherein: n
volumefor blower fan rated speed; Q
volumefor the ventilation at blower fan rated speed lower filter screen, by under rated speed, measure; N is the current rotating speed of blower fan; Q is for passing through filter screen air quantity.
Tool of the present invention has the following advantages:
1, under the extreme climate conditions such as sandstorm, misty rain sky, by analyzing affecting the detection of the environment parameter such as dust content of air, humidity of laying dust process, can the change procedure of the laying dust amount of filter screen, laying dust trend and result be made and being prejudged, the accelerated deterioration of filter screen performance is avoided in the measure of employing prevention property, reduce its maintenance frequency, increase the service life.
2, the present invention gathers ambient air quality by air purity sensor, humidity sensor, by pressure sensor monitoring filter net jam situation, then the current and historical record of comprehensive these monitored data, select corresponding control strategy, adopt the dust suppression of varying strength, taken into account the balanced relation of in good time high-effective dust-removing and energy-saving and cost-reducing two general objectives.
3, the present invention holds dirt characteristic to filter screen and analyzes and import in control strategy in experimental basis, sets up operational model filter screen laying dust amount is calculated, and makes to estimate laying dust amount and actual laying dust amount is pressed close to more, has improved the accuracy of estimating.
4, by the determination and analysis to air humidity, at misty rain weather and filter screen, have in certain laying dust situation, startup heating element heater is carried out to heat drying blowback to filter screen to dedusting air-flow, prevent that filter screen dust and steam effect from forming stickiness particle and causing filter net jam.
5, the present invention's configurable ultrasonic transducer also, in scanning dedusting, utilize hyperacoustic higher-order of oscillation effect to make dust accelerate to be condensed into particulate group, under gravity or inertia force effect, from gas, separate, thereby reach the effect that strengthens dedusting and clean air.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the FB(flow block) of method of work of the present invention.
The specific embodiment
Below in conjunction with embodiment and contrast accompanying drawing the present invention is described in further detail.
A new wind ventilation unit for the self-cleaning dedusting function of tool, can be widely used in, in the ventilating system of machine room or factory building, giving full play to its usefulness, the maintenance frequency and the maintenance cost that promote dust removing effects and reduce dust pelletizing system; It comprises performance element, detecting unit, controller and gas source unit;
Performance element comprise by outdoor air send into indoor pressure fan 17, be arranged on described pressure fan 17 air inlets a screen pack 20, be arranged at a MOD 15 of the air inlet of described pressure fan 17, also comprise and be arranged on the dust removal head 7 of screen pack 20 medial surfaces, the driving mechanism 9 that drives dust removal head 7 to work, described screen pack 20 inner sides are provided with vertical its surperficial shower nozzle 10 that points to, and described shower nozzle 10 connects gas source unit 14 by magnetic valve 13 pipes; Gas source unit 14 can be air pump or the compression gas tank that pipe connects shower nozzle, on air flue between gas source unit 14 outlet and shower nozzle 10, be provided with heater 12 and a temperature sensor 11 that is controlled by controller 1, for source of the gas gas out being heated when dehumidifying, screen pack 20 places are also provided with the ultrasonic transducer 5 that is controlled by controller 1;
Detecting unit provides the detection information of controlled device for controller 1, comprise and be arranged on the outdoor air humidity sensor 2 for testing environment amount, air-temperature sensor 4, koniology concentration sensor 3 etc., be arranged on screen pack two side faces for detection of the baroceptor 8 of the ventilation of filter screen two side faces, and be arranged on rotation speed of fan sensor 19 on described blower fan 17, be arranged on described air door 15 throttle opening sensor 16, be arranged on the position sensor 18 of described driving mechanism and be arranged on the testing circuit on described driving mechanism circuit;
Controller 1 is electrically connected each sensor and the testing circuit of detecting unit, for receiving the information of collection and selecting dedusting scheme according to associated information calculation; Described controller 1 is electrically connected performance element and gas source unit, for each parts and gas source unit transmission operation or the stop signal to performance element according to the dedusting scheme of selecting.
With reference to figure 2, for workflow of the present invention, comprise the steps:
101, device start and initialization;
102, controller receives the Information Monitoring that detecting unit sends on schedule;
103, judgement comprises whether the environment parameter of air humidity, temperature, koniology concentration surpasses scheduled volume, is, jumps to 201, no, carries out 104;
104, whether the draught head that judges filter screen two side faces surpasses scheduled volume, is, jumps to 106, no, carries out 105;
105, judge that whether the times of collection of this collection period is identical with pre-determined number, be, carry out 106, no, times of collection adds 1 and jump to 102;
106, controller is added up this collection period environment parameter, by the draught head of filter screen air quantity, filter screen two side faces, is calculated the laying dust increment of this collection period, goes out the state parameter of this collection period by weighted calculation;
Whether the state parameter that 107, judges this collection period in predetermined dedusting state parameter, be, carries out next step, no, times of collection zero clearing jump to 102;
Whether the state parameter that 108, judges this collection period in predetermined ultrasonic dedusting state parameter, be, carries out 109, no, skips 109 execution next steps;
109, start ultrasonic wave assisted dust-collecting, and carry out next step;
Whether the state parameter that 110, judges this collection period in predetermined dehumidifying state parameter, be, carries out 111, no, jumps to 112;
111, start heater, and carry out 112;
112, start dust removal head and shower nozzle work;
113, whether the working time that judges dust removal head and shower nozzle work surpasses the time in the state parameter of this collection period, is, carries out 114, no, continues to carry out 113;
114, step 107 quits work to each equipment of start in step 112, and times of collection zero clearing also jumps to 102;
201, environment parameter overload alarm device are shut down.
The ventilating system that disposes dust concentration sensor, humidity sensor, air pressure probe of take is below described the operation principle of controller as example:
1, controller be take time T as a collection period, regularly detects the rotation speed of fan of ventilating system in collection period, after collection period finishes, calculates mean speed n; Because there is following linear approximate relationship in ventilating system air quantity and rotation speed of fan:
Wherein: n
volumefor blower fan rated speed; Q
volumefor the ventilation at blower fan rated speed lower filter screen, by under rated speed, measure; N is the current rotating speed of blower fan; Q is for passing through filter screen air quantity;
Relation can calculate the average air quantity that passes through filter screen in a collection period thus.
2, from last dedusting, start timing so far, amount in N collection period, the average dust concentration in this N collection period is designated as D
1... D
n, average air quantity is designated as Q
1... Q
n, medial humidity is designated as H
1... H
n.
3, calculate the laying dust increment in the collection period T time:
Method 1: test method(s), on test data basis, characteristic relation discretization to laying dust increment and dust concentration and ventilation in the unit interval is made two-dimensional data table, is defined as and holds in the power down nonvolatile storage that dirt coefficient is kept at controller, the D of the 1st collection period
1dust concentration and Q
1holding dirt coefficient and can obtain by tabling look-up under air quantity, is designated as Ld
1, the rest may be inferred, the D of N collection period
ndust concentration and Q
nholding dirt coefficient and can obtain by tabling look-up under air quantity, is designated as Ld
n.
By holding dirt coefficient, can show that the laying dust increment of the 1st collection period is Δ S
1=T*Ld
1..., the laying dust increment of N collection period is Δ S
n=T*Ld
n.
Method 2: equation, according to the average dust concentration in collection period and average ventilation, can calculate the laying dust increment of N collection period by following empirical equation:
ΔS
N＝TD
N*10
-3QNη
Wherein:
Δ S
nthe laying dust increment of N collection period filter screen of s; (g)
The time of T-collection period; (h)
D
nthe average dust concentration in-N collection period filter screen outside; (mg/m
3)
Q
n-N collection period is by the average air quantity of filter screen; (m
3/ h)
The heavy efficiency of meter of η-filter screen.
4, from last dedusting, start the laying dust amount of a timing N so far collection period
5, dust concentration mean square deviation D for the present invention
aqeestimate the change procedure trend of dirt accumulation, the dust concentration value of being reviewed forward M cycle by current collection period calculates:
6, the numerical discretization of laying dust amount S is turned to A grade, to concentration mean square deviation D
aqenumerical discretization turn to B grade, according to ventilating system at different laying dust amount S and dust concentration mean square deviation D
aqethe two-dimentional Policy Table that the information such as the optimization dedusting manner of execution under experimental condition, time, number of times are made A*B is kept in the power down nonvolatile storage of controller.
7, change into that dry, slight humidity, moderate are moist, highly moist, humidity transfinites 5 grades by the average air humidity H in nearest several collection period is discrete, as humidity transfinites, to stop immediately ventilation state, filter screen airless is passed through, and protection filter screen and indoor environment are avoided moisture and are invaded and harassed; As be that moderate is moist, height moisture conditions, will to laying dust amount and dust concentration mean square deviation, carry out humidity compensate correction according to humidity level, increase its corresponding grade point.Laying dust amount after compensation and dust concentration mean square deviation grade are designated as S ' and D '
aqe.
8, the dedusting policy selection based on laying dust amount and dust concentration mean square deviation of the present invention is: during system operation, by the laying dust amount grade S ' after humidity compensate and dust concentration mean square deviation grade D '
aqelook into two-dimentional Policy Table, draw execution information such as whether needing to start the dedusting manner of execution of dedusting and dust arrester, time, number of times.
Above-mentioned control strategy is by the detection to air ambient figureofmerit and ventilating system state, comprehensively analyzed the current and historical record of each state of system, specification and characteristic in conjunction with filter screen and air channel, to dust in the accumulation process trend of filter screen with result is estimated and analysis of strategies, select corresponding with it differentiation dedusting method, taken into account high-effective dust-removing and energy-saving and cost-reducing balanced relation.
The Main Function of performance element is the execution information such as dedusting method, time and number of times that calculate according to controller, start the executing agencies such as corresponding motor, magnetic valve, blower fan, air door, drive hairbrush, gases at high pressure shower nozzle or dust absorption nozzle by the scanned filter screen of fixation locus of design, remove the dust gathering on filter screen.Performance element can comprise ultrasonic transducer, can be arranged on outside or the inner side of ventilating system filter screen.When dedusting, start ultrasonic transducer assisted dust-collecting simultaneously, strengthen dust removing effects: dust particle surface institute is electrically charged, through ultrasonic vibration, particle is condensed into particulate group under sieving actoion, effect of inertia, cohesion and electromagnetic force, the quality of increase particulate is separated under the effect of gravity or inertia force from gas, thereby reaches the effect of clean air.Performance element also can comprise heater, if outdoor air humidity is moist or height Moisture Sensitivity Level in moderate, and started self-cleaning dedusting by control strategy, to open heater dedusting air-flow will be carried out to heat drying, to dry up screen pack, prevent that moisture and dust from forming the obstruction that stickiness particle causes filter screen.
More than that new wind ventilation unit and the method for work thereof of the self-cleaning dedusting function of tool of the present invention are set forth; be used for helping to understand the present invention; but embodiments of the present invention are not restricted to the described embodiments; anyly do not deviate from the change done under the principle of the invention, modification, substitute, combination, simplify; all should be equivalent substitute mode, within being included in protection scope of the present invention.
Claims (10)
1. a new wind ventilation unit for the self-cleaning dedusting function of tool, is characterized in that: comprise performance element, detecting unit, controller and gas source unit;
Described performance element comprise by outdoor air send into indoor pressure fan, be arranged on described pressure fan air inlet a screen pack, be arranged at a MOD of the air inlet of described pressure fan, also comprise and be arranged on the dust removal head of screen pack medial surface, the driving mechanism of driving dust removal head work, described screen pack inner side is provided with vertical its surperficial shower nozzle that points to, and described shower nozzle connects gas source unit by a magnetic valve pipe;
Described detecting unit comprises and is arranged on outdoor air humidity sensor, air-temperature sensor, koniology concentration sensor, be arranged on the baroceptor of described screen pack two side faces, and be arranged on rotation speed of fan sensor on described blower fan, be arranged on described air door throttle opening sensor, be arranged on described driving mechanism position sensor, be arranged on the testing circuit on described driving mechanism circuit;
Described controller is electrically connected each sensor and the testing circuit of detecting unit, for receiving the information of collection and selecting dedusting scheme according to associated information calculation; Described controller is electrically connected performance element and gas source unit, for each parts and gas source unit transmission operation or the stop signal to performance element according to the dedusting scheme of selecting.
2. the new wind ventilation unit of the self-cleaning dedusting function of tool according to claim 1, is characterized in that: described gas source unit is air pump or the compression gas tank that pipe connects described shower nozzle.
3. the new wind ventilation unit of the self-cleaning dedusting function of tool according to claim 1 and 2, is characterized in that: described screen pack place is also provided with the ultrasonic transducer that is controlled by controller.
4. the new wind ventilation unit of the self-cleaning dedusting function of tool according to claim 1 and 2, is characterized in that: on the air flue between described gas source unit outlet and shower nozzle, be provided with a heater that is controlled by controller.
5. a self-cleaning dust collection method for the arbitrary new wind ventilation unit described in right to use requirement 1-4, is characterized in that comprising the steps:
101, device start and initialization;
102, controller receives the Information Monitoring that detecting unit sends on schedule;
103, judgement comprises whether the environment parameter of air humidity, temperature, koniology concentration surpasses scheduled volume, is, jumps to 201, no, carries out 104;
104, whether the draught head that judges filter screen two side faces surpasses scheduled volume, is, jumps to 106, no, carries out 105;
105, judge that whether the times of collection of this collection period is identical with pre-determined number, be, carry out 106, no, times of collection adds 1 and jump to 102;
106, controller is added up this collection period environment parameter, by the draught head of filter screen air quantity, filter screen two side faces, is calculated the laying dust increment of this collection period, goes out the state parameter of this collection period by weighted calculation;
Whether the state parameter that 107, judges this collection period in predetermined dedusting state parameter, be, carries out next step, no, times of collection zero clearing jump to 102;
112, start dust removal head and shower nozzle work;
113, whether the working time that judges dust removal head and shower nozzle work surpasses the time in the state parameter of this collection period, is, carries out 114, no, continues to carry out 113;
114, step 107 quits work to each equipment of start in step 112, and times of collection zero clearing also jumps to 102;
201, environment parameter overload alarm device are shut down.
6. self-cleaning dust collection method according to claim 5, is characterized in that: described step 107 is rear further comprising the steps of:
Whether the state parameter that 108, judges this collection period in predetermined ultrasonic dedusting state parameter, be, carries out 109, no, skips 109 execution next steps;
109, start ultrasonic wave assisted dust-collecting, and carry out next step.
7. according to the self-cleaning dust collection method described in claim 5 or 6, it is characterized in that: described step 112 is front further comprising the steps of:
Whether the state parameter that 110, judges this collection period in predetermined dehumidifying state parameter, be, carries out 111, no, jumps to 112;
111, start heater, and carry out 112.
8. self-cleaning dust collection method according to claim 5, it is characterized in that: the calculating of described laying dust increment comprises: in the unit interval that experimentation is obtained, the characteristic relation discretization of laying dust increment and dust concentration and ventilation is made two-dimensional data table, be defined as and hold in the power down nonvolatile storage that dirt coefficient is kept at controller, T holding dirt coefficient Ld and can table look-up and obtain by the dust concentration in this period and air quantity in the time, thereby laying dust increment Delta S can be obtained with holding the amassing of dirt coefficient by the time, i.e. Δ S=T*Ld.
9. self-cleaning dust collection method according to claim 5, is characterized in that: the computing formula of described laying dust increment is:
ΔS＝TD*10
-3Qη；
Wherein: the laying dust increment of Δ S-T time Inner filter net, unit is g;
T-time value, unit is h;
The average dust concentration in D-T time Inner filter net outside, unit is mg/m
3;
In the Q-T time, by the average air quantity of filter screen, unit is m
3/ h;
The heavy efficiency of meter of η-filter screen.
10. self-cleaning dust collection method according to claim 5, is characterized in that: the described computing formula by filter screen air quantity is:
Wherein: n
volumefor blower fan rated speed; Q
volumefor the ventilation at blower fan rated speed lower filter screen, by under rated speed, measure; N is the current rotating speed of blower fan; Q is for passing through filter screen air quantity.
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|---|---|---|---|
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|---|---|---|---|
| CN201310202525.9A CN104180465B (en) | 2013-05-23 | 2013-05-23 | Fresh air ventilating device with self cleaning and dedusting function and dedusting method of fresh air ventilating device |
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| CN114719407A (en) * | 2022-02-21 | 2022-07-08 | 宁波奥克斯电气股份有限公司 | Dust removal control method and device for condenser and air conditioner |
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Address after: 518000, Zhongxing new industrial park, 1 new head road, Bantian street, Longgang District, Guangdong, Shenzhen Patentee after: SINDI TECHNOLOGIES CO.,LTD. Address before: 518129, Zhongxing new industrial park, 1 new road, Shenzhen street, Bantian street, Longgang District, Guangdong, China Patentee before: Shenzhen Zhongxing Xindi Telecom Equipment Ltd. |
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