CN103512685A - Sealing force testing device used for studying damping seal prerotation effect - Google Patents
Sealing force testing device used for studying damping seal prerotation effectDownload PDFInfo
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- CN103512685A CN103512685ACN201310473490.2ACN201310473490ACN103512685ACN 103512685 ACN103512685 ACN 103512685ACN 201310473490 ACN201310473490 ACN 201310473490ACN 103512685 ACN103512685 ACN 103512685A
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- LTNZEXKYNRNOGT-UHFFFAOYSA-Ndequalinium chlorideChemical compound[Cl-].[Cl-].C1=CC=C2[N+](CCCCCCCCCC[N+]3=C4C=CC=CC4=C(N)C=C3C)=C(C)C=C(N)C2=C1LTNZEXKYNRNOGT-UHFFFAOYSA-N0.000description1
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Abstract
Translated fromChinese
Description
Technical field
The present invention relates to a kind of for studying the prewhirl sealing force proving installation of effect of damping seal, be applicable to the size of sealant flow muscle power in the leakage rate of the hermetically-sealed constructions such as impeller port ring in the hydraulic sets such as the hydraulic turbine, multistage centrifugal pump, inter-stage sealing, balancing drum and restricted restricting bushing and sealing runner, relate in particular in operation operating mode the entrance comparatively significantly test of damping seal of effect of prewhirling.
Background technology
The sixties in last century, the sealing force that Lomakin proposes in centrifugal pump sealing ring that under fast state, two ends pressure reduction is larger is that dynamic performance and stability have material impact to axle, and the people such as external Black, Childs has done correlation theory to sealing force in smooth seal ring and derives and experimental study subsequently.The end of the eighties, Nordman proposes the damping seal forming by modes such as fluting or borings on sealed stator or rotor seal face, as labyrinth seal, spiral labyrinch seal, honeycomb seal etc., compare with the smooth seal ring of identical physical dimension, under identical operating mode, be conducive to reduce seal leakage amount, and in its seal clearance, sealing force is conducive to improve shafting stability.Due to damping seal complex structure, form and physical dimension are various, theoretical research can not well be predicted the sealing force size under its duty, therefore, set up the size of the different operating mode lower seal of damping seal power of the dissimilar and size of a set of Accurate Measurement with general applicability significant.
The what is called effect of prewhirling, sealing ring gap porch fluid circumferential speed size affects the velocity and pressuredistributions of gap inner fluid, and then sealing force is had to considerable influence.In high pressure multiple-stage centrifugal pump, because size and structural limitations can not be analyzed separately relatively its sealing ring intensity of prewhirling, therefore need to set up a set of sealing force determinator of adjusting comparatively easily the different intensity of prewhirling, the realization analysis and research of effect on sealing force impact of prewhirling, tool is of great significance.
Therefore, guaranteeing under the prerequisite that hydraulic hydraulic efficiency meets the demands, increase damping seal as far as possible and equipment dynamic is learned to the Beneficial Effect of stability, just need to test size and the variation tendency thereof of sealant flow muscle power in the leakage rate of the damping seal under different structure and physical dimension under various operation operating modes and sealing runner.For this reason, project planner wishes to design a set of proving installation with good versatility, can measure for situations such as different operating operating mode, different length-diameter ratio, different structure form, various geometric the size of sealant flow muscle power in seal leakage amount and sealing runner.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of simple in structure for studying the prewhirl sealing force proving installation of effect of damping seal.
In order to solve the problems of the technologies described above, the invention provides a kind ofly for studying the prewhirl sealing force proving installation of effect of damping seal, comprise the annular seal space, main shaft, driving shaft and the tank that by entrance end cap and water conservancy diversion end cap, form; Described main shaft runs through annular seal space; On described driving shaft, be provided with conducting slip ring assembly, the right-hand member of described driving shaft is connected with the left end of main shaft by resistance-strain type of dynamometer meter, and described resistance-strain type of dynamometer meter is connected with conducting slip ring component signals; The low order end of described main shaft is provided with sealed rotational part; Correspond to sealed rotational Jian position, on water conservancy diversion end cap, be provided with the sealed stator that forms clearance leakage runner with sealed rotational part, in sealed stator, be provided with outlet, described outlet is connected with tank, and the lower end of described tank is provided with resistance strain weighing transducer; On the main shaft in described sealed rotational part left side, be provided with the axle sleeve of prewhirling that forms annular channel with water conservancy diversion end cap; The outside wall surface of the described axle sleeve of prewhirling is provided with helicla flute, when helicla flute rotates with main shaft, precession direction is pointed to annular channel endpiece, helicla flute groove depth is at least 1/3 of annular channel radial dimension, and the radial dimension of described annular channel is at least 10 times of clearance leakage runner radial dimension; Described inlet end bezel ring, is to being provided with 1 runner entrance.
As to of the present invention for studying the prewhirl improvement of sealing force proving installation of effect of damping seal: on described resistance-strain type of dynamometer meter, be also provided with dynamometer protective cover; On described dynamometer protective cover, be provided with data conductor fairlead; Described resistance-strain type of dynamometer meter is drawn data conductor by wire fairlead, and described data conductor is connected with conducting slip ring assembly.
As to of the present invention for studying the prewhirl further improvement of sealing force proving installation of effect of damping seal: described resistance-strain type of dynamometer meter comprises two distortion muscle shaft collars, four rectangles distortion muscle and 36 sheet resistance foil gauges; Between described two distortion muscle shaft collars, be uniformly distributed four rectangle distortion muscle, on every described rectangle distortion muscle, nine sheet resistance foil gauges be set respectively; The distortion muscle shaft collar of described one end is fixedly connected with driving shaft, and the distortion muscle shaft collar of described other one end is fixedly connected with main shaft; The distortion muscle shaft collar of described dynamometer protective cover and a side interfixes, and described 36 sheet resistance foil gauges and data conductor interconnect.
As to of the present invention for studying the prewhirl further improvement of sealing force proving installation of effect of damping seal: described conducting slip ring assembly comprises support, conducting slip ring rotating ring and conducting slip ring stationary ring; Described conducting slip ring moving ring sleeve is contained on driving shaft, on described conducting slip ring rotating ring, conducting slip ring stationary ring is set, on described conducting slip ring rotating ring, arrange with conducting slip ring rotating ring and form the conducting slip ring stationary ring being rotationally connected, described conducting slip ring stationary ring is fixed by support, described conducting slip ring stationary ring and data conductor interconnect, and by data conductor, the data of acquisition are derived.
As to of the present invention for studying the prewhirl further improvement of sealing force proving installation of effect of damping seal: in described sealed stator, be provided with boss, described sealed stator realizes the location with water conservancy diversion end cap and outlet by boss; Described sealed stator is bolted on respectively on water conservancy diversion end cap and outlet.
As to of the present invention for studying the prewhirl further improvement of sealing force proving installation of effect of damping seal: between described outlet and tank, by flexible pipe, interconnect; The bottom of described tank is provided with the bottom leak-off pipe for being connected with extraneous pipeline.
As to of the present invention for studying the prewhirl further improvement of sealing force proving installation of effect of damping seal: between entrance end cap and main shaft, be provided with radial seal assembly, described radial seal assembly comprises the labyrinth seal assemblies being arranged between entrance end cap inner ring surface and main shaft lateral surface, and for the lip seal assembly of secondary seal.
The present invention has good versatility, can complete the test to different sealing by fast assembling-disassembling, and have and measure accurately and can obtain the advantages such as data are abundant, can under the prerequisite that guarantees data reliability, seal various operating modes, the Measurement accuracy of the data of especially different prewhirl leakage rate under intensity and sealing forces, the research that is kinetic effect to axle for sealing force provides authentic data.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Fig. 1 is of the present invention for studying the prewhirl primary structure schematic diagram of sealing force proving installation of effect of damping seal;
Fig. 2 is the primary structure schematic diagram of resistance-strain type of dynamometer meter 4 in Fig. 1;
Fig. 3 is the A-A sectional structure schematic diagram of resistance-strain type of dynamometer meter 4 in Fig. 1;
Fig. 4 is the distribution schematic diagram of 36 sheet resistance foil gauges on four rectangle distortion muscle in Fig. 2.
Embodiment
Embodiment 1, Fig. 1～Fig. 3 have provided a kind of for studying the prewhirl sealing force proving installation of effect of damping seal; Comprise driving shaft 1, conducting slip ring assembly 2, dynamometer protective cover 3, resistance-strain type of dynamometer meter 4, radial seal assembly, main shaft 6, sealed rotational part 7, outlet 9, sealed stator 10, the axle sleeve 11 of prewhirling, water conservancy diversion end cap 12, entrance end cap 14 and tank 16.
Above-described water conservancy diversion end cap 12 and entrance end cap 14 forms annular seal spaces, is used as the prewhirl main place of effect of test damping seal; Main shaft 6 laterally runs through annular seal space, and radial seal assembly is arranged between entrance end cap 14 inner ring surfaces and main shaft 6 lateral surfaces, and radial seal assembly comprises labyrinth seal assemblies, and for the lip seal assembly 5 of secondary seal.
The right half part of driving shaft 1 arranges conducting slip ring assembly 2, and conducting slip ring assembly 2 comprises support, conducting slip ring rotating ring 22 and conducting slip ring stationary ring 23; Conducting slip ring rotating ring 22 suits (fixing) are on driving shaft 1, conducting slip ring stationary ring 23 suits (on-fixed) are on conducting slip ring rotating ring 22, conducting slip ring stationary ring 23 is fixed with support, between conducting slip ring stationary ring 23 and conducting slip ring rotating ring 22 for being rotationally connected, when conducting slip ring rotating ring 22 rotates with driving shaft 1, conducting slip ring stationary ring 23 keeps stationary state by support.
Driving shaft 1 right-hand member is fixedly linked by resistance-strain type of dynamometer meter 4 and the left end of main shaft 6, and resistance-strain type of dynamometer meter 4 comprises that two distortion muscle shaft collars, four rectangles are out of shape muscle and 36 sheet resistance foil gauges; As shown in Figures 2 and 3, two distortion muscle shaft collars are respectively left distortion muscle shaft collar 41 and right distortionmuscle shaft collar 42, and left distortion muscle shaft collar 41 is fixedly connected with the right-hand member of driving shaft 1, and right distortionmuscle shaft collar 42 is fixedly connected with the left end of main shaft 6; Four rectangle distortion muscle are rectangle distortion muscle I 43, rectangle distortion muscle II 44, rectangle distortion muscle III 45 and rectangle distortion muscle IV 46; The left and right two ends of rectangle distortion muscle I 43, rectangle distortion muscle II 44, rectangle distortion muscle III 45 and rectangle distortion muscle IV 46 are fixed on respectively on left distortion muscle shaft collar 41 and right distortionmuscle shaft collar 42 uniformly, 36 sheet resistance foil gauges are evenly distributed in rectangle distortion muscle I 43, rectangle distortion muscle II 44, rectangle distortion muscle III 45 and rectangle distortion muscle IV 46, as shown in Figure 4, on every rectangle distortion muscle, be assigned nine sheet resistance foil gauges, as A0, A12, A22, A21, A11, A32, A42, A31 and the A41 in rectangle distortion muscle I 43; As D0, D12, D22, D21, D11, D32, D42, D31 and the D41 in rectangle distortion muscle III 45; For keeping drawing clean and tidy, omit the resistance strain gage mark in rectangle distortion muscle II 44 and rectangle distortion muscle IV 46; The distributional pattern of 36 sheet resistance foil gauges in rectangle distortion muscle I 43, rectangle distortion muscle II 44, rectangle distortion muscle III 45 and rectangle distortion muscle IV 46 is identical.For above-described two distortion muscle shaft collars, four rectangle distortion muscle and 36 sheet resistance foil gauges are protected; prevent damage; on left distortion muscle shaft collar 41, being fixed with dynamometer protective cover 3(dynamometer protective cover 3 wraps two distortion muscle shaft collars, four rectangle distortion muscle and 36 sheet resistance foil gauges completely), on dynamometer protective cover 3, have data conductor fairlead 15(and by data conductor fairlead 15, be guided out the resistance variations signal of 36 sheet resistance foil gauges).
The low order end fixing seal tumbler 7 of main shaft 6; Correspond to the position of sealed rotational part 7, the sealed stator 10 that forms clearance leakage runner 20 with sealed rotational part 7 is set on water conservancy diversion end cap 12; The axle sleeve 11 of prewhirling that forms annular channel 19 with water conservancy diversion end cap 12 is set on the main shaft 6 in sealed rotational part 7 left sides; The outside wall surface of axle sleeve 11 of prewhirling is provided with helicla flute, when helicla flute rotates with main shaft 6, precession direction is pointed to annular channel 19 endpiece, helicla flute groove depth is at least 1/3 of annular channel 19 radial dimensions, and the radial dimension of annular channel 19 is at least 10 times of clearance leakage runner 20 radial dimensions; The removable type that is connected to of prewhirling between axle sleeve 11 and main shaft 6, the axle sleeve 11 of prewhirling that has a helicla flute grooved by replacing has been realized the independent regulation of prewhirl intensity and rotating speed, and the change of grooved mainly comprises the width of lead angle, groove tooth and degree of depth etc.Simultaneously, proving installation is by (the outer loop pipeline here does not provide in patent accompanying drawing with outer loop pipeline, refer to that current enter the pipeline in water conservancy diversion end cap 12 and entrance end cap 14 composition annular seal spaces, discharge the pipeline after tank 16 with current, an and circulation line that can change water flow pressure forming of each valve and supercharge pump, for existing known technology, be not described in detail) and motor circuit (the motor circuit here refers to and drives the necessary electromotor that driving shaft 1 rotates and the frequency converter of controlling motor, by variable frequency adjustment, the rotating speed of axle is regulated, for existing known technology, be not described in detail) cooperation realize sealed rotational part 8 (the different operating modes be here exactly mainly intake pressure under different operating modes, rotating speed, the adjusting of the intensity of prewhirling) performance measurement.
In sealed stator 10, be provided with boss, sealed stator 10 realizes the location with water conservancy diversion end cap 12 and outlet 9 by boss; In sealed stator 10, by boss, realize behind the accurate location with water conservancy diversion end cap 12 and outlet 9, then be bolted on respectively on water conservancy diversion end cap 12 and outlet 9.Outlet 9 left ends are as low-pressure cavity, and insert the liquid into right-hand member, and the right-hand member of outlet 9 has flexible pipe 21 by clamp connection, and other one end of flexible pipe 21 is placed in tank 16, setting both can meet the requirement that fast assembling-disassembling is changed sealing like this, had eliminated again the restriction of long sealing installation dimension.Tank 16 lower end is provided with resistance strain weighing transducer 17; The bottom of tank 16 is provided with the bottom leak-off pipe 18 for being connected with extraneous pipeline.
Entrance end cap 14 hoops are provided with 1 runner entrance 13.The right-hand member of main shaft 6 is fixed with axis head nut 8, and axis head nut 8 is mainly used in the axial restraint of enhanced leaktightness tumbler 7, sealed rotational part 7 jails, top, plays the effect of the right-hand member of protection main shaft 6 simultaneously, reduces the abrasion of current.
Above-described 36 sheet resistance foil gauges all (record the size of relevant position strain by data conductor (through wire fairlead 15) by the resistance obtaining by the variation of resistance-strain sheet resistance, and then solving the sealing force that acts on main shaft 6 in the size of assigned direction) delta data is transferred in conducting slip ring rotating ring 22, signal is transferred to conducting slip ring stationary ring 23 by conducting slip ring rotating ring 22 again, and conducting slip ring stationary ring 23 is transferred to external data acquisition and processing system by other data conductor.Between resistance strain weighing transducer 17 and data acquisition and processing system, signal is connected, by resistance strain weighing transducer 17 realize damping seal at a high speed, the Accurate Determining of less leakage rate under low voltage difference operating mode.
When reality is used, step is as follows:
1, from runner entrance 13, introduce current;
2, by driving shaft 1, rotate, by driving shaft 1, drive respectively conducting slip ring rotating ring 22 and resistance-strain type of dynamometer meter 4 to rotate, resistance-strain type of dynamometer meter 4 drives main shafts 6 to rotate, and main shaft 6 drives the axle sleeve 11 of prewhirling to rotate, and the helicla flute of the axle sleeve 11 of prewhirling produces the current speed of prewhirling in current;
3, by external system, by support, fix to connection conducting slip ring stationary ring 23(conducting slip ring stationary ring 23, not along with conducting slip ring rotating ring 22 rotates), by conducting slip ring stationary ring 23, electric signal (voltage or current signal) is provided to conducting slip ring rotating ring 22 again, again by conducting slip ring rotating ring 22 by electric signal transmission to three 16 sheet resistance foil gauges, forming bridge balance between four rectangle distortion muscle, (resistance strain gage is arranged on four rectangle distortion muscle, on every rectangle distortion muscle, nine resistance strain gages are set, by four corresponding resistance strain gages on four rectangle distortion muscle, form a bridge balance, always have nine bridge balances),
Due to current by clearance leakage runner 20 time, the power that the main shaft 6 that exerts an influence rotates, after main shaft 6 is subject to power, the right distortionmuscle shaft collar 42 of main shaft 6 left ends is directly affected, cause four rectangle distortion sprains of muscle and tendon between left distortion muscle shaft collar 41 and right distortionmuscle shaft collar 42 bent, directly cause four bridge balances between rectangle distortion muscle to be broken, the fluctuation of generation current, by data line, the fluctuation signal of electric current is exported to conducting slip ring stationary ring 23, then by conducting slip ring stationary ring 23, the fluctuation signal of electric current is exported to data acquisition system (DAS);
4, current are successively after annular channel 19 and clearance leakage runner 20, by outlet 9, through flexible pipe 21, enter in tank 16, resistance strain weighing transducer 17 in tank 16 collects corresponding data, and corresponding data transmission is done to corresponding processing in data acquisition and processing system.
Finally, it is also to be noted that, what more than enumerate is only a specific embodiment of the present invention.Obviously, the invention is not restricted to above embodiment, can also have many distortion.All distortion that those of ordinary skill in the art can directly derive or associate from content disclosed by the invention, all should think protection scope of the present invention.
Claims (7)
1. one kind for studying the prewhirl sealing force proving installation of effect of damping seal; It is characterized in that: comprise the annular seal space, main shaft (6), driving shaft (1) and the tank (16) that by entrance end cap (14) and water conservancy diversion end cap (12), form;
Described main shaft (6) runs through annular seal space;
On described driving shaft (1), be provided with conducting slip ring assembly (2), the right-hand member of described driving shaft (1) is connected with the left end of main shaft (6) by resistance-strain type of dynamometer meter (4), and described resistance-strain type of dynamometer meter (4) is connected with conducting slip ring assembly (2) signal;
The low order end of described main shaft (6) is provided with sealed rotational part (7); Correspond to the position of sealed rotational part (7), on water conservancy diversion end cap (12), be provided with the sealed stator (10) that forms clearance leakage runner (20) with sealed rotational part (7), in sealed stator (10), be provided with outlet (9), described outlet (9) is connected with tank (16), and the lower end of described tank (16) is provided with resistance strain weighing transducer (17);
On the main shaft (6) in described sealed rotational part (7) left side, be provided with the axle sleeve of prewhirling (11) that forms annular channel (19) with water conservancy diversion end cap (12); The outside wall surface of the described axle sleeve of prewhirling (11) is provided with helicla flute, when helicla flute rotates with main shaft (6), precession direction is pointed to annular channel (19) endpiece, helicla flute groove depth is at least 1/3 of annular channel (19) radial dimension, and the radial dimension of described annular channel (19) is at least 10 times of clearance leakage runner (20) radial dimension;
Described entrance end cap (14) hoop is provided with 1 runner entrance (13).
2. according to claim 1 for studying the prewhirl sealing force proving installation of effect of damping seal, it is characterized in that: on described resistance-strain type of dynamometer meter (4), be also provided with dynamometer protective cover (3); On described dynamometer protective cover (3), be provided with data conductor fairlead (15);
Described resistance-strain type of dynamometer meter (4) is drawn data conductor by wire fairlead (15), and described data conductor is connected with conducting slip ring assembly (2).
3. according to claim 2 for studying the prewhirl sealing force proving installation of effect of damping seal, it is characterized in that: described resistance-strain type of dynamometer meter (4) comprises two distortion muscle shaft collars, four rectangles distortion muscle and 36 sheet resistance foil gauges;
Between described two distortion muscle shaft collars, be uniformly distributed four rectangle distortion muscle, on every described rectangle distortion muscle, nine sheet resistance foil gauges be set respectively;
The distortion muscle shaft collar of described one end is fixedly connected with driving shaft (1), and the distortion muscle shaft collar of described other one end is fixedly connected with main shaft (6);
Described dynamometer protective cover (3) interfixes with the distortion muscle shaft collar of a side, and described 36 sheet resistance foil gauges and data conductor interconnect.
4. according to claim 3 for studying the prewhirl sealing force proving installation of effect of damping seal, it is characterized in that:
Described conducting slip ring assembly (2) comprises support, conducting slip ring rotating ring (22) and conducting slip ring stationary ring (23);
Described conducting slip ring rotating ring (22) is sleeved on driving shaft (1), conducting slip ring stationary ring (23) is set on described conducting slip ring rotating ring (22), the upper setting with conducting slip ring rotating ring (22) of described conducting slip ring rotating ring (22) forms the conducting slip ring stationary ring (23) being rotationally connected, described conducting slip ring stationary ring (23) is fixed by support, described conducting slip ring stationary ring (23) interconnects with data conductor, by data conductor, the data of acquisition is derived.
5. according to claim 4 for studying the prewhirl sealing force proving installation of effect of damping seal, it is characterized in that: described sealed stator is provided with boss on (10), described sealed stator (10) realizes the location with water conservancy diversion end cap (12) and outlet (9) by boss;
Described sealed stator (10) is bolted on respectively on water conservancy diversion end cap (12) and outlet (9).
6. according to claim 5 for studying the prewhirl sealing force proving installation of effect of damping seal, it is characterized in that: between described outlet (9) and tank (16), by flexible pipe (21), interconnect;
The bottom of described tank (16) is provided with the bottom leak-off pipe (18) for being connected with extraneous pipeline.
7. according to claim 6 for studying the prewhirl sealing force proving installation of effect of damping seal, it is characterized in that: between entrance end cap (14) and main shaft (6), be provided with radial seal assembly, described radial seal assembly comprises the labyrinth seal assemblies being arranged between entrance end cap (14) inner ring surface and main shaft (6) lateral surface, and for the lip seal assembly (5) of secondary seal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310473490.2ACN103512685B (en) | 2013-10-11 | 2013-10-11 | Sealing force testing device used for studying damping seal prerotation effect |
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| CN201310473490.2ACN103512685B (en) | 2013-10-11 | 2013-10-11 | Sealing force testing device used for studying damping seal prerotation effect |
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| CN103512685Atrue CN103512685A (en) | 2014-01-15 |
| CN103512685B CN103512685B (en) | 2015-04-08 |
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| CN201310473490.2AExpired - Fee RelatedCN103512685B (en) | 2013-10-11 | 2013-10-11 | Sealing force testing device used for studying damping seal prerotation effect |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106424883A (en)* | 2016-11-09 | 2017-02-22 | 哈尔滨理工大学 | Ball-end mill with multifunctional micro-texture in titanium alloy machining |
| CN106644196A (en)* | 2016-11-02 | 2017-05-10 | 中国航天空气动力技术研究院 | Dynamic torque measurement sensor with speed measurement function |
| CN107131980A (en)* | 2017-06-09 | 2017-09-05 | 上海交通大学 | The direct stress that a kind of small rotary tank prepares mud-rock flow determines device |
| CN109580071A (en)* | 2018-11-29 | 2019-04-05 | 浙江大学 | A kind of rotation drive shaft exciting force and impeller measurement of exciting force method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106424883A (en)* | 2016-11-09 | 2017-02-22 | 哈尔滨理工大学 | Ball-end mill with multifunctional micro-texture in titanium alloy machining |
| CN107131980A (en)* | 2017-06-09 | 2017-09-05 | 上海交通大学 | The direct stress that a kind of small rotary tank prepares mud-rock flow determines device |
| CN109580071A (en)* | 2018-11-29 | 2019-04-05 | 浙江大学 | A kind of rotation drive shaft exciting force and impeller measurement of exciting force method |
| CN109580071B (en)* | 2018-11-29 | 2020-01-21 | 浙江大学 | Method for measuring excitation force of rotary driving shaft and excitation force of impeller |
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| Publication number | Publication date |
|---|---|
| CN103512685B (en) | 2015-04-08 |
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