CN103486058A - Contra-rotating axial-flow fan with lateral external-type one-driving-two motor - Google Patents
Contra-rotating axial-flow fan with lateral external-type one-driving-two motor Download PDFInfo
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Abstract
The invention relates to a contra-rotating axial-flow fan with a lateral external-type one-driving-two motor. The contra-rotating axial-flow fan with the lateral external-type one-driving-two motor mainly solves the technical problems that the manufacturing cost of the existing axial-flow fan is high, the operation reliability and safety are lower, the working difficulty in maintenance is great and the like, and improves the operating environment and the stress situation of the motor are improved. The technical scheme is that a front impeller (2) and a rear impeller (7) are fixedly and respectively installed on two output shafts of a transmission case (6) on a base in an inner cylinder of a main machine cylinder (3), flow guide blades (5) and a flow guide blade adjusting mechanism (4) are arranged in an annular passage between the two impellers, a motor support (16) is arranged outside the lateral direction of the main machine cylinder (3) and a motor (15) which is installed on the motor support (16) is connected with the transmission case (6). The contra-rotating axial-flow fan with the lateral external-type one-driving-two motor is a ventilation device which can be widely used in industries such as mining, metallurgy, chemical industry and power plants and can be especially used for working places of explosion, high temperature, corrosion and the like.
Description
Technical field
The present invention relates to a kind of ventilator, particularly a kind of axial fan.
Background technique
At present, ventilator is the universal machine that is widely used in the national economy every profession and trade.Divide centrifugal blower fan and the large class of axial-flow blower two.So-called axial-flow blower, just refer on axial section, air-flow in the runner of rotation blade along axial direction mobile ventilator, from appearance, the housing of axial-flow blower is again the part in air channel, the blade of blower fan along the circumferential direction is evenly arranged on wheel hub, and wheel hub is fixedly mounted on the motor-shaft extending of arranging along axial direction, and motor is axial arranged along cylindrical shell.This blower fan is large because having flow, and volume is little, and the characteristics that pressure head is low are mainly used in the ventilation system of the large flow of various needs.In order to improve pressure, be applied to fed distance length or the larger ventilation system of system resistance, often adopt the form of multistage-combination.General way is to be designed to revolving structure.Be about to two impeller diameters identical, revolution is identical, the axial-flow blower series operation that sense of rotation is contrary.Contain certain flammable needs that burst into the special medias such as part and burn into high temperature in order to adapt to carry.Except supporting, have explosion-proof, high temperature resistant, corrosion resistant motor, and, require motor and gas flow are isolated fully.So, the form that is structurally inside and outside suit by barrel designs.Annular space between inside and outside cylindrical shell is runner.Motor is arranged in inner core.And take airtight measure.Consider the structural strength of motor mount and the needs of motor ventilation heat radiation, several prismatics or oval ventilation duct are set between inside and outside cylindrical shell., there is following some shortcomings part in the axial-flow blower of this structural type.
1, axial dimension is larger, mounting arrangements inconvenience.Because Axial-flow fan motor is axially to install, larger in the size of its length direction, consider again the needs that motor is installed, safeguarded and ventilate, the cylindrical shell length of blower fan is generally also long than motor, like this, makes the length dimension of whole blower fan larger.When plural serial stage is installed, and increase noise elimination structure, the size of its length direction is just larger.
2, operational reliability is poor.Impeller is fixedly supported upon on the shaft extension of motor front end, forms cantilever support.In running, existing dynamic load radially, have again thrust load, and the shaft strength situation of motor front end is bad.The lubricating condition of bearing is also poor, although designed the outside oiling into and out of oil pipe from cylindrical shell.But, because of many reasons, the lubrication problem of motor bearings never has fine solution, motor bearings burns out and therefore wearing and tearing too early also cause the phenomenon of motor damage that generation is often arranged.
3, the maintenance of motor and bearing and service work difficulty are larger.Because motor is very heavy, there is again impeller to be fixedly mounted on axle, no matter be dismounting or lifting, workload and work difficulty are all quite large.Although the blower fan cylindrical shell is mostly the opposite opened removable structure, open part on cylindrical shell, unloads impeller, motor is taken out or installs, not the part nothing the matter.Just not saying need employ large tonnage crane, after disintegration, install again, its installation precision is to be difficult to guarantee.
4, manufacture cost is high.This is mainly reflected in following several respects:
Motor is arranged in runner, must select and have flame proof, high temperature resistant, the product of decay resistance, and its cost ratio common electric machine is wanted high 20-30%.
When fans in series is used, every Fans has multiple electric motors, and when its control system adopts the form of one-to-one, the automatical control system cost is high.
The manufacture cost of axial-flow blower is mainly on host groups, and when series connection is used, a plurality of independently host groups, combine, and the complete machine cost is higher.
5, the Security of system and equipment operation is poor.Be applied to the axial-flow blower of mine ventilation, the safe operation problem is the most key.Except adopting anti-explosion motor, also need motor and runner are sealed to isolation.The medium of processing is high temperature, corrosive gas, the apolegamy of motor security level requires higher, need too with runner in medium isolated.However, because of the accident that the motor contact medium causes, still of common occurrence.
6, adaptability has certain limitation.Due to impeller be direct connection on motor, be subject to the restriction of motor pole number and power classification, the rotating speed of ventilator and the excursion of performance number just are restricted.
Summary of the invention
The purpose of this invention is to provide that a kind of work is more reliable, longer service life, cost of production significantly reduces and the adjustment of maintenance and inspection and blade is convenient motor side be to external one drag two counter-rotating axial fan,, operational reliability high in order to the existing propeller fan manufacture cost of thorough solution, Security than low, the repair and maintenance work difficulty is large, the technical problems such as bad adaptability, and improve motor operation working environment and force-bearing situation.
The technical solution adopted for the present invention to solve the technical problems is: it comprises front impeller 2, main frame cylindrical shell 3, guide vane controlling mechanism 4, guide vane 5, transmission case 6, rear impeller 7, inner coupling (10), transmission shaft 11, outside coupling 14, motor 15 and motor support base 16, main frame cylindrical shell 3 comprises urceolus and inner core, there is end plate at the inner core two ends, transmission case 6 is arranged on the support in main frame cylindrical shell 3 inner cores, impeller 2 before fixed installation on two output shafts of transmission case 6, rear impeller 7, between two impellers in annular pass, be provided with guide vane 5 and guide vane controlling mechanism 4, be outside equipped with motor support base 16 in main frame cylindrical shell 3 side direction, on motor support base 16, mounted motor 15, motor 15 is by outside coupling 14, transmission shaft 11, inner coupling 10 connects with transmission case 6.
Be provided with slip ring 1 before described main frame cylindrical shell 3, back is provided with noise elimination diffusion barrel 8.
Described transmission case 6 adopts case structure, comprises upper shell 601, temperature transducer 602, lower shell body 603, cooling water connector 604, lubricant oil inlet and outlet connectors 605, output shaft 606, gland 607, oil sealing 608, bearing 609, driven wheel of differential 610, locking nut 611, drive bevel gear 612 and input shaft 613 are provided with the oil storage cavity in transmission case 6, cooling water connector 604 and lubricant oil inlet and outlet connectors 605, mechanism housing is comprised of upper shell 601 and lower shell body 603, the housing middle part is provided with output shaft 606, bearing 609 coordinates with output shaft 606, bearing 609 outsides are provided with oil sealing 608 and gland 607, and at bearing 609 place's set temperature sensors 602, output shaft 606 is set to 90 degrees on same level with input shaft 613, one end of two output shafts 606, connect respectively Impeller, the other end connects 610, two driven wheels of differential of driven wheel of differential 610 and drive bevel gear 612 engagements by locking nut 611, and drive bevel gear 612 is fixed on input shaft 613 by locking nut 611.
The input shaft 613 of transmission case 6 and the output shaft of motor 15, two axial lines is in same plane, and on same straight line.The output shaft 603 of transmission case 6 is with the axis of main frame cylindrical shell 3 on same straight line, and main frame cylindrical shell 3 inner chamber bottoms arrange dunnage.
The number of teeth of two driven wheels of differential 610 is identical, and the gear ratio of drive bevel gear 612 and driven wheel of differential 610 can be greater than 1 or be less than 1 or equal 1.
Be provided with dome dish or friction wheel on outside coupling 14, be furnished with break 13 on dome dish or friction wheel.
Between the inner core of main frame cylindrical shell 3 and urceolus, some guide vanes 5 are set, all guide vanes 5 connect with guide vane controlling mechanism 4.
The invention has the beneficial effects as follows: the propeller fan of said structure mode, by motor being arranged on the motor support base of the lateral position outside the main frame cylindrical shell, design a transmission case with dual output function, draught fan impeller is installed on the output shaft of transmission case, be connected with transmission shaft, coupling between transmission case and motor, utilize the rotation direction of two output shafts contrary, the principle that rotating speed is identical, the job requirement of realization to the axial flow rotary blower fan, and reach the purpose of design of motor one drag two.
The accompanying drawing explanation
Fig. 1 is forward structure cross-sectional schematic of the present invention.
Fig. 2 is left TV structure schematic diagram of the present invention.
Fig. 3 is plan structure schematic diagram of the present invention.
Fig. 4 is transmission case forward schematic diagram of the present invention.
Fig. 5 is transmission case side schematic view of the present invention.
Fig. 6 is that transmission case of the present invention is overlooked cross-sectional view.
In figure: the 1-slip ring, impeller before 2-, 3-main frame cylindrical shell, 4-guide vane controlling mechanism, the 5-guide vane, the 6-transmission case, impeller after 7-, 8-noise elimination diffusion barrel, the 9-water-cooling tube, the inner coupling of 10-, the 11-transmission shaft, the 12-oil level indicator, the 13-break, the outside coupling of 14-, the 15-motor, the 16-motor support base, the 601-upper shell, the 602-temperature transducer, the 603-lower shell body, the 604-cooling water connector, 605-lubricant oil inlet and outlet connectors, the 606-output shaft, the 607-gland, the 608-oil sealing, the 609-bearing, the 610-driven wheel of differential, the 611-locking nut, the 612-drive bevel gear, the 613-input shaft.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further details.
Embodiment 1, the invention provides a kind of motor side to external one drag two counter-rotating axial fan, it is characterized in that: it comprises front impeller 2, main frame cylindrical shell 3, guide vane controlling mechanism 4, guide vane 5, transmission case 6, rear impeller 7, inner coupling (10), transmission shaft 11, outside coupling 14, motor 15 and motor support base 16, main frame cylindrical shell 3 comprises urceolus and inner core, the runner that annular space between inside and outside cylindrical shell is gas, there is end plate at the inner core two ends, prevent from or reduce harmful air-flow entering inner core transmission case being impacted.Transmission case 6 is arranged on the support in main frame cylindrical shell 3 inner cores, impeller 2 before fixed installation on two output shafts of transmission case 6, rear impeller 7, between two impellers in annular pass, be provided with guide vane 5 and guide vane controlling mechanism 4, guide vane 5 can arrange several as required, each stator 5 connects with guide vane controlling mechanism 4, while adopting the rotation of manual or electronic regulating and controlling mechanism, all guide vane 5 synchronous interactions, realize the adjustment of blade angle, make the flow outlet direction of a grade blade and the airflow inlet direction of two grade blades, all at a certain ideal position.Be outside equipped with motor support base 16 in main frame cylindrical shell 3 side direction, motor support base 16 can as required, be made overall structure or make absolute construction with main frame cylindrical shell 3.On motor support base 16, mounted motor 15, and motor 15 connects with transmission case 6 by outside coupling 14, transmission shaft 11, inner coupling 10.Consult Fig. 1 to Fig. 6.
1, modern design.Existing propeller fan, impeller is mostly to be fixed on the axle head of motor, realizes direct-connection transmission.Some axial-flow blowers are also arranged, on the antero posterior axis of motor, fix respectively an impeller, still, its sense of rotation is identical, can not realize revolving.The axial-flow blower also had, realize the motor one drag two by transmission case, and as the axial-flow blower of K series, still, the rotation of impeller does not meet the characteristics to revolving yet.The present invention has the transmission case of two output shafts by design, replace motor position and be arranged in the main frame cylindrical shell.And motor is shifted out, be arranged on the side direction support of main frame cylindrical shell.Use coupling and propeller shaft couplings between motor and transmission case.The structural feature that following several respects are arranged after improvement: the one, motor (15) adopts transmission shaft (11) with the Placement of transmission case (6); The 2nd, the axial direction of motor (15) is vertical with the output axis of transmission case (6).Simultaneously, the output shaft of transmission case (6) becomes 90 ° of layouts with input shaft direction on horizontal plane.The 3rd, transmission case is designed to export the gearbox that is greater than or less than or equals input speed, is different from common speed reducer.
2, manufacture cost reduces greatly.Be mainly reflected in following several respects.
At first be to adopt the common electric machine replacement explosion-proof, high temperature resistant, etch-proof special machines, its expense is to reduce by 30% left and right, offsets and increases the expense of transmission case, still will save motor buying or the manufacturing cost of 20% left and right.
Secondly, adopt a motor that power is larger, replace two motors that power is less, manufacturing expense or buying expenses all have significantly reduction.
Again, after electric machine external, do not need two host groups, utilize a host groups with transmission case just can realize revolving, reach the purpose that improves blast, structural simplification, reduce materials consumption, and manufacturing process is simple, save many manufacturing costs.
Inferior again, the control gear of a motor, although power of motor increases, its expense will be lacked more than the regulate expenditure of two motors.
3, improve in operational reliability, Security and working life.The fault of axial-flow blower in running, be mainly the problem of motor aspect, as the reasons such as overload cause that bearing burns out, as oil supply pipeline stops up the insufficient lubrication cause, as ventilation duct stops up, causes that electric machine temperature rise is too high etc.Adopt transmission case and external motor, and increase the measures such as water cooling plant and thin oil lubricant in transmission case, the possibility that bearing burns out, greatly reducing, even damage is arranged, is changed and also will be facilitated a lot.Motor does not need oil supply pipeline to be lubricated, and does not need ventilation duct yet, has basically avoided the operation troubles of motor.Motor is arranged on outside housing, not with runner in medium contact, in the occasion that is applied to colliery discharge and contains methane gas, stopped the possibility of blast fully.Safety in operation is greatly improved.In the system that is applied to high temperature, corrosive gas, greatly improve the working life of motor.On break coupling mounted externally, and adopt electro-hydraulic brake, fewer than the heating of built-in break, retro-speed is fast, and reliability is higher.This point for main fan for mines, need to be carried out in time inverted ventilation when calamitous operating mode occurs, and has prior meaning.
4, performance range increases, and adaptability is wider.Be mainly reflected in following several respects:
Electric machine external, outside cylindrical shell, not only is adapted to flammable use that can quick-fried operating mode occasion, as the ventilation in colliery.And be adapted to the operating mode occasion of high-temperature flue gas, as the ventilation of the rugged environment such as steel mill of power plant.
After electric machine external, only need the less transmission case of boundary dimension in inner core, the randomness of inner diameter of steel flue size variation is larger, thereby makes the degrees of freedom of fan blade and hub ratio design larger, and wider with the performance number scope of plane No. blower fan, adaptability also is improved.
According to channel theory, the flow of blower fan is directly proportional to rotating speed, and square being directly proportional of blast and rotating speed, be directly proportional to the cube of power.After impeller diameter and blade structure are determined, because the velocity ratio of transmission case can be changeable arbitrarily, the rotating speed of blower fan no longer is subject to the restriction of motor pole number.Can change the velocity ratio of transmission case according to working condition, just can meet the demands.In a sense, change the velocity ratio of transmission case, just equal to have changed a Fans.
5, external dimension are few, save installing space.Adopt the electric machine external formula structure of the technical program, the length of host groups is only half of length of the built-in host groups of separate unit, thereby the complete machine length of blower fan greatly reduces.It is installed basic construction amount and also will reduce.
6, maintenance, safeguard and adjust more convenient.The axial-flow blower of conventional construction mode, the maintenance of motor and inspection must be taken outer cylinder body apart, and motor is taken out.Adopt the technical program, motor is arranged on outside the main frame cylindrical shell, and lubricated, ventilation condition is improved greatly, and rate of fault greatly reduces, even fault is arranged, it is also very convenient to safeguard.Transmission case is arranged in the main frame cylindrical shell, but has adopted thin oil lubricant and circulating water, can improve its load-carrying properties by many kinds of measures in design in addition, can guarantee long-term failure-free operation fully, even fault is arranged, because its volume and weight is fewer than motor, safeguard also much easier.
7, there is energy-saving effect preferably.This major embodiment is both ways:
Suppose that total output is identical, adopt a motor that power is larger, than adopting two motors that power is less, the electromagnetism loss of motor itself will be lacked, and useful horsepower is improved.
Adopt transmission case to replace the motor direct-connection transmission, on transmission efficiency, will reduce by 3% left and right.But, after electric machine external, more unobstructed in runner, host groups length also reduces, the viscous loss of gas in runner reduces, and can make the efficiency of blower fan improve 3%-5%, thereby, the efficiency of complete machine is increased.Consult Fig. 1 to Fig. 6, all the other are with above-mentioned embodiment.
Claims (9)
1. a motor side, to external one drag two counter-rotating axial fan, is characterized in that: it comprises front impeller (2), main frame cylindrical shell (3), guide vane controlling mechanism (4), guide vane (5), transmission case (6), rear impeller (7), inner coupling (10), transmission shaft (11), outside coupling (14), motor (15) and motor support base (16), main frame cylindrical shell (3) comprises urceolus and inner core, there is end plate at the inner core two ends, and transmission case (6) is arranged on the support in main frame cylindrical shell (3) inner core, impeller (2) before fixed installation on two output shafts of transmission case (6), rear impeller (7), between two impellers in annular pass, be provided with guide vane (5) and guide vane controlling mechanism (4), be outside equipped with motor support base (16) in main frame cylindrical shell (3) side direction, the upper mounted motor (15) of motor support base (16), motor (15) is by outside coupling (14), transmission shaft (11), inner coupling (10) connects with transmission case (6).
2. motor side according to claim 1, to external one drag two counter-rotating axial fan, is characterized in that: the front slip ring (1) that is provided with of described main frame cylindrical shell (3), back is provided with noise elimination diffusion barrel (8).
3. motor side according to claim 1 is to external one drag two counter-rotating axial fan, it is characterized in that: described transmission case (6) adopts case structure, comprise upper shell (601), temperature transducer (602), lower shell body (603), cooling water connector (604), lubricant oil inlet and outlet connectors (605), output shaft (606), gland (607), oil sealing (608), bearing (609), driven wheel of differential (610), locking nut (611), drive bevel gear (612) and input shaft (613), be provided with the oil storage cavity in transmission case (6), cooling water connector (604) and lubricant oil inlet and outlet connectors (605), mechanism housing is comprised of upper shell (601) and lower shell body (603), the housing middle part is provided with output shaft (606), bearing (609) coordinates with output shaft (606), bearing (609) outside is provided with oil sealing (608) and gland (607), and locate set temperature sensor (602) at bearing (609), output shaft (606) is set to 90 degrees on same level with input shaft (613), one end of two output shafts (606), connect respectively Impeller, the other end connects driven wheel of differential (610) by locking nut (611), two driven wheels of differential (610) all mesh with drive bevel gear (612), drive bevel gear (612) is fixed on input shaft (613) by locking nut (611).
4. motor side according to claim 3 is to external one drag two counter-rotating axial fan, it is characterized in that: cooling water connector (604) is connected with water-cooling tube (9), pick out outside main frame cylindrical shell (3) by water-cooling tube (9), be connected with drainage pipeline; Lubricant oil inlet and outlet connectors (605) picks out outside main frame cylindrical shell (3) by pipeline, and the pipeline opening outside main frame cylindrical shell (3) arranges oil level indicator (12).
5. motor side according to claim 3 is to external one drag two counter-rotating axial fan, it is characterized in that: the input shaft (613) of transmission case (6) and the output shaft of motor (15), two axial lines is in same plane, and on same straight line, the output shaft (603) of transmission case (6) is with the axis of main frame cylindrical shell (3) on same straight line, and main frame cylindrical shell (3) inner chamber bottom arranges dunnage.
6. motor side according to claim 3 is to external one drag two counter-rotating axial fan, it is characterized in that: the number of teeth of two driven wheels of differential (610) is identical, the gear ratio of drive bevel gear (612) and driven wheel of differential (610), can be greater than 1 or be less than 1 or equal 1.
7. motor side according to claim 1, to external one drag two counter-rotating axial fan, is characterized in that: outside coupling is provided with dome dish or friction wheel on (14), is furnished with break (13) on dome dish or friction wheel.
8. motor side according to claim 1 is to external one drag two counter-rotating axial fan, it is characterized in that: between the inner core of main frame cylindrical shell (3) and urceolus, some guide vanes (5) are set, all guide vanes (5) connect with guide vane controlling mechanism (4).
9. motor side according to claim 1 is to external one drag two counter-rotating axial fan; it is characterized in that: by reducing or increase additional facilities; but; utilize transmission device, drag two impellers simultaneously, make two same rotating speeds of impeller; the rotation of different direction; realization other structure to the working principle of axial flow rotary blower fan, as four impellers of two groups of motors form the plural serial stage structures to the axial flow rotary blower fan, be all the protection domain of this patent.
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| CN201310361415.7A CN103486058B (en) | 2013-08-19 | 2013-08-19 | Motor side external formula one drag two counter-rotating axial fan |
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| CN201310361415.7A CN103486058B (en) | 2013-08-19 | 2013-08-19 | Motor side external formula one drag two counter-rotating axial fan |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103786628A (en) * | 2014-01-09 | 2014-05-14 | 平安电气股份有限公司 | Mobile multi-stage hydraulic-drive pneumatic spray dust-settling truck |
| CN104612989A (en) * | 2014-12-06 | 2015-05-13 | 无锡高卓流体设备有限公司 | Energy-saving two-stage fan |
| CN104929960A (en) * | 2015-05-18 | 2015-09-23 | 德州贝诺风力机械设备有限公司 | Single-driving double-oar counter-rotating fan |
| WO2016197283A1 (en) * | 2015-06-12 | 2016-12-15 | 太原理工大学 | Ventilation device with contra-rotating impellers driven by long shaft |
| CN109237714A (en) * | 2018-09-21 | 2019-01-18 | 美的集团武汉制冷设备有限公司 | Air conditioner and its control method and storage medium |
| CN110500298A (en) * | 2019-09-26 | 2019-11-26 | 华北重型装备制造有限公司 | Outer-rotor permanent magnet motor multi-stage impeller axis circulation wind apparatus |
| CN111237212A (en) * | 2018-11-29 | 2020-06-05 | 曾固 | Fluid centrifugal cross-flow action device without driving source and fan |
| CN111305889A (en) * | 2020-02-21 | 2020-06-19 | 青岛理工大学 | Ventilation system and method for metal mine exploitation |
| CN112642810A (en) * | 2020-12-18 | 2021-04-13 | 张风才 | Motor device with air purging structure |
| CN114396388A (en) * | 2021-12-15 | 2022-04-26 | 贵州盘江煤层气开发利用有限责任公司 | Opposite-rotating axial flow fan capable of adjusting pressure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103786628A (en) * | 2014-01-09 | 2014-05-14 | 平安电气股份有限公司 | Mobile multi-stage hydraulic-drive pneumatic spray dust-settling truck |
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| WO2016197283A1 (en) * | 2015-06-12 | 2016-12-15 | 太原理工大学 | Ventilation device with contra-rotating impellers driven by long shaft |
| CN109237714A (en) * | 2018-09-21 | 2019-01-18 | 美的集团武汉制冷设备有限公司 | Air conditioner and its control method and storage medium |
| CN111237212A (en) * | 2018-11-29 | 2020-06-05 | 曾固 | Fluid centrifugal cross-flow action device without driving source and fan |
| CN110500298A (en) * | 2019-09-26 | 2019-11-26 | 华北重型装备制造有限公司 | Outer-rotor permanent magnet motor multi-stage impeller axis circulation wind apparatus |
| CN111305889A (en) * | 2020-02-21 | 2020-06-19 | 青岛理工大学 | Ventilation system and method for metal mine exploitation |
| CN112642810A (en) * | 2020-12-18 | 2021-04-13 | 张风才 | Motor device with air purging structure |
| CN114396388A (en) * | 2021-12-15 | 2022-04-26 | 贵州盘江煤层气开发利用有限责任公司 | Opposite-rotating axial flow fan capable of adjusting pressure |
| CN114396388B (en) * | 2021-12-15 | 2023-10-13 | 贵州盘江煤层气开发利用有限责任公司 | Disrotatory axial flow fan with adjustable pressure |
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| CN103486058B (en) | 2016-02-03 |
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