CN203374323U - Low-pressure front-back shaft sealing parts - Google Patents
Low-pressure front-back shaft sealing parts Download PDFInfo
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- CN203374323U CN203374323U CN201320301484.4U CN201320301484U CN203374323U CN 203374323 U CN203374323 U CN 203374323U CN 201320301484 U CN201320301484 U CN 201320301484U CN 203374323 U CN203374323 U CN 203374323U
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- low pressure
- shaft seal
- dividing plate
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- moving vane
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
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Abstract
Low-pressure front-back shaft sealing parts comprise a front shaft sealing part which is arranged on the outer side of a low-pressure rotor in a sleeved mode. The low-pressure rotor comprises at least one partitioning plate which comprises a static vane, a movable vane, a static vane grid and a vane top. The partitioning plate has two pressure levels. The low-pressure front-back shaft sealing parts can effectively lower the water erosion phenomenon of the last-level movable vane, air leaking in is avoided, energy transmission efficiency is improved, and the low-pressure front-back shaft sealing parts have the advantages that energy loss is lowered during practical engineering use, and heat supply efficiency is improved.
Description
Technical field
The utility model relates to a kind of low pressure shaft seal sealing technique, particularly a kind of steam turbine low pressure shaft seal field of sealing technology.
Background technique
At present China's heat supply present situation be take extraction for heat supply and little unit rough vacuum back pressure heat supply process as main, and the minority region has and utilizes earth source heat pump to implement for the cold-peace heat supply.Continuous expansion and Plant reconstruction plant modernization due to area of heat-supply service lags behind in addition, and the boiler heat supplying mode that occupies a narrow space still exists, and this heat-supplying mode not only environmental pollution is serious, and the Economy extreme difference.What economic benefit and social benefit required provides, and causes capacity is less than normal, energy consumption is higher steam turbine set today rapid, increasingly competitive in electric power development without any advantage.Unit is carried out to the heat supply transformation and become the effective way that extends unit durability, improves unit efficiency, adopt the low-pressure section transformation to realize that the circulating water direct-furnish is most suitable method simultaneously.Steam turbine is as the capital equipment of heat power station, and the steam discharge of its low pressure (LP) cylinder is negative pressure, therefore needs the end of countershaft and exhaust casing to be sealed, and prevents that air from entering, effectively maintaining the vacuum environment of vapour condenser.The designing and arranging steam pressure of vapour condenser steam turbine is generally the 5kPa left and right, the quality of steam turbine low pressure shaft seal sealing effect, directly affect the size of exhaust steam pressure, the bad exhaust steam pressure of steam turbine that directly causes of sealing effect raises, affect the Economy of unit, the every rising 1kPa of exhaust steam pressure needs gross coal consumption rate 1% left and right of rising, and every rising 1kPa exhaust steam pressure needs the 3g/kW.h standard coal.For realizing the target of energy-saving and emission-reduction, development of practical, reliably low-pressure shaft seal sealing device for steam turbine, prevent outside air enter, effectively maintain and to reduce steam turbine exhaust pressure very necessary.
The utility model patent that application number is 200820220312.3 discloses a kind of steamer low pressure shaft seal seal arrangement, it comprises low pressure rotor, lower steam supply pipe, shaft seal back-steam chamber, lower return tube, contactless boss sealing tooth and shaft seal steam chamber, on the shaft seal steam chamber of this device upper end, is connected with steam supply pipe.This model utility is simple in structure, easy for installation, can steady in a long-term move, but its sealing effect is undesirable.
The model utility content
The utility model is improved for above-mentioned defect, a kind of low pressure for steam turbine front and back shaft seal is provided, and it comprises front shaft seal, and this front axle big envelope is contained in the low pressure rotor outside, this low pressure rotor comprises at least one dividing plate, and this dividing plate comprises stator blade, moving vane, static cascade and Ye Ding.
Preferably, described dividing plate comprises two pressure levels.
In above-mentioned arbitrary scheme, preferably, each pressure level comprises four dividing plates.
In above-mentioned arbitrary scheme, preferably, described stator blade all adopts the efficient new blade profile of novel optimization, has improved stage efficiency, increases angle of attack scope to improve off design performance.
In above-mentioned arbitrary scheme, preferably, described moving vane top comprises the moving vane blade tip seal.
In above-mentioned arbitrary scheme, preferably, moving vanes at different levels adopt and carry the shroud round linking, and moving blade ' s shroud band is processed as interior tiltedly outer flat structure, makes meridian plane form the fairing passage.
In above-mentioned arbitrary scheme, preferably, moving vane blade designs at different levels make the upper and lower velocity flow profile of steam passage reasonable, have reduced the moving vane loss.
Preferably, between described dividing plate, diaphragm gland is housed in above-mentioned arbitrary scheme.
In above-mentioned arbitrary scheme, preferably, described diaphragm gland is the low voltage partition plate packing.
In above-mentioned arbitrary scheme, preferably, except last stage movable vane, the moving vane top adopts dredges the former stage teeth packing that is designed with the twice gland sealing gear of tooth-like adjustable packing replacement, to reduce leakage losses.
In above-mentioned arbitrary scheme, preferably, described dividing plate all adopts the Weldable Steel dividing plate, and Weldable Steel dividing plate material is good, leaf grating part machining accuracy is high, can guarantee that static cascade reaches the design thermodynamic property, and can extend dividing plate working life.
In above-mentioned arbitrary scheme, preferably, described dividing plate adopts the directly welded structure.
In above-mentioned arbitrary scheme, preferably, described stator blade adopts the bending blade profile.
In above-mentioned arbitrary scheme, preferably, described stator blade trailing edge thickness is 0.38mm.
In above-mentioned arbitrary scheme, preferably, the axle head of described dividing plate adopts straight flat tooth packing.
In above-mentioned arbitrary scheme, preferably, the leaf of described dividing plate top adopts the broach packing, and the broach packing is similar to the broach shape.
In above-mentioned arbitrary scheme, preferably, the L O section outer shroud is provided with dehumidification structure, and the little water droplet in steam flow, in the effect of centrifugal force falls into moisture-catcher, is walked around last stage movable vane, directly enters steam-expelling port, can effectively alleviate the water erosion phenomenon of last stage movable vane.
In above-mentioned arbitrary scheme, preferably, all dividing plate splits adopt bolton, and during maintenance, inner casing need not hang out.
In above-mentioned arbitrary scheme, preferably, last two-stage dividing plate adopts the guide ring seamlessly transitted to replace, and the steam after acting covers into vapour condenser by steam discharge guide ring two.
Before and after a kind of low pressure of the present utility model, the working method of shaft seal is: the gas in vapour condenser enters the steam supply chamber of the front shaft seal of low pressure, and to the both sides dividing plate, flow respectively, the forward and reverse totally 8 pairs of dividing plates of low-pressure section, adopt the directly welded structure, stator blade all adopts the bending blade profile, the stator blade lagging edge is repaiied and is thinned to 0.38mm, and low voltage partition plate, axle head adopt straight flat tooth packing, and the leaf top adopts the broach packing.The L O section outer shroud is provided with dehumidification structure, and the little water droplet in steam flow, in the effect of centrifugal force falls into moisture-catcher, is walked around last stage movable vane, directly enters steam-expelling port, can effectively alleviate the water erosion phenomenon of last stage movable vane.All dividing plate splits adopt bolton, and during maintenance, inner casing need not hang out.Last two-stage dividing plate adopts the guide ring seamlessly transitted to replace, and the steam after acting covers into vapour condenser by steam discharge guide ring two.
Before and after low pressure of the present utility model, shaft seal can effectively alleviate the water erosion phenomenon of last stage movable vane, avoids air to bleed, and improves energy transfer efficiency, in the actual use of engineering, has the reduction energy loss, improves the good effect of heating efficiency.
Before and after low pressure of the present utility model, the technological scheme of shaft seal comprises the combination in any of each part mentioned above, and the simple change of each part mentioned above assembly or combination are still protection domain of the present utility model.
More multioperation is all known for those of ordinary skills, repeats no more.
The accompanying drawing explanation
Fig. 1 is the cross-sectional view according to a preferred embodiment of shaft seal before and after low pressure of the present utility model.
Fig. 2 is 22 grades of moving vane blade tip seal structural representations embodiment illustrated in fig. 1.
Fig. 3 is 23 grades of moving vane blade tip seal structural representations embodiment illustrated in fig. 1.
Fig. 4 is 20-22 level embodiment illustrated in fig. 1 and the structural representation of 24-26 level dividing plate.
In Fig. 1-Fig. 4, numeral means respectively:
1 coupling 2 low pressure rotors
Shaft seal 4 guide rings before 3 low pressure
5 the 27th grade of low voltage partition plate packing 6 dividing plates
The 25th grade of dividing plate of 7 the 26th grades of dividing plates 8
9 the 24th grades of dividing plate 10 shunting rings
The 21st grade of dividing plate of 11 the 20th grades of dividing plates 12
The 23rd grade of dividing plate of 13 the 22nd grades of dividing plates 14
The 21st grade of moving vane blade tip seal of 20 the 20th grades of moving vane blade tip seals 21
The 23rd grade of moving vane blade tip seal of 22 the 22nd grades of moving vane blade tip seals 23
The 25th grade of moving vane blade tip seal of 24 the 24th grades of moving vane blade tip seals 25
The 27th grade of moving vane blade tip seal of 26 the 26th grades of moving vane blade tip seals 27.
Embodiment
In order to understand better the utility model, below in conjunction with accompanying drawing, describe in detail respectively according to shaft seal before and after the utility model low pressure.Fig. 1 is the cross-sectional view according to a preferred embodiment of shaft seal before and after low pressure of the present utility model, the structural representation of 22 grades of Fig. 2-Figure 4 shows that the present embodiment and 23 grades of moving vane blade tip seal structural representations and 20-22 level and 24-26 level dividing plate, in the present embodiment, low pressure antero posterior axis package is drawn together the front shaft seal 3 of low pressure, before this low pressure, shaft seal 3 is sleeved on low pressure rotor 2 outsides, this low pressure rotor 3 comprises eight pairs of dividing plates, and this dividing plate comprises stator blade, moving vane, static cascade.
In the present embodiment, described dividing plate comprises two pressure levels.
In the present embodiment, each pressure level comprises four dividing plates.
In the present embodiment, described dividing plate comprises stator blade.
In the present embodiment, described stator blade all adopts the efficient new blade profile of novel optimization, has improved stage efficiency, increases angle of attack scope to improve off design performance.
In the present embodiment, described moving vane top comprises the moving vane blade tip seal.
In the present embodiment, moving vanes at different levels adopt and carry the shroud round linking, and moving blade ' s shroud band is processed as interior tiltedly outer flat structure, makes meridian plane form the fairing passage.
In the present embodiment, moving vane blade designs at different levels make the upper and lower velocity flow profile of steam passage reasonable, have reduced the moving vane loss.
In the present embodiment, between described dividing plate, diaphragm gland is housed.
In the present embodiment, described diaphragm gland is the low voltage partition plate packing.
In the present embodiment, except last stage movable vane, the moving vane top adopts dredges the former stage teeth packing that is designed with the twice gland sealing gear of tooth-like adjustable packing replacement, to reduce leakage losses.
In the present embodiment, described dividing plate all adopts the Weldable Steel dividing plate, and Weldable Steel dividing plate material is good, leaf grating part machining accuracy is high, can guarantee that static cascade reaches the design thermodynamic property, and can extend dividing plate working life.
In the present embodiment, described dividing plate adopts the directly welded structure.
In the present embodiment, described stator blade adopts the bending blade profile.
In the present embodiment, described stator blade trailing edge thickness is 0.38mm.
In the present embodiment, the axle head of described dividing plate adopts straight flat tooth packing.
In the present embodiment, the leaf of described dividing plate top adopts the broach packing, and the broach packing is similar to the broach shape.
In the present embodiment, the L O section outer shroud is provided with dehumidification structure, and the little water droplet in steam flow, in the effect of centrifugal force falls into moisture-catcher, is walked around last stage movable vane, directly enters steam-expelling port, can effectively alleviate the water erosion phenomenon of last stage movable vane.
In the present embodiment, all dividing plate splits adopt bolton, and during maintenance, inner casing need not hang out.
In the present embodiment, last two-stage dividing plate adopts the guide ring 4 seamlessly transitted to replace, and the steam after acting covers into vapour condenser by steam discharge guide ring two.
In the present embodiment, described dividing plate comprises the 27th grade of dividing plate 6, the 26th grade of dividing plate 7, the 25th grade of dividing plate 8, the 24th grade of dividing plate 9, the 20th grade of dividing plate 11, the 21st grade of dividing plate 12, the 22nd grade of dividing plate 13, the 23rd grade of dividing plate 14.
In the present embodiment, described moving vane blade tip seal comprises the 20th grade of moving vane blade tip seal 20, the 21st grade of moving vane blade tip seal 21, the 22nd grade of moving vane blade tip seal 22, the 23rd grade of moving vane blade tip seal 23, the 24th grade of moving vane blade tip seal 24, the 25th grade of moving vane blade tip seal 25, the 26th grade of moving vane blade tip seal 26, the 27th grade of moving vane blade tip seal 27.
In the present embodiment, between described the 26th grade of moving vane blade tip seal 26 and the 27th grade of moving vane blade tip seal 27, low voltage partition plate packing 5 is housed.
In the present embodiment, between described the 26th grade of moving vane blade tip seal 26 and the 25th grade of moving vane blade tip seal 25, low voltage partition plate packing 5 is housed.
In the present embodiment, between described the 25th grade of moving vane blade tip seal 25 and the 24th grade of moving vane blade tip seal 24, low voltage partition plate packing 5 is housed.
In the present embodiment, between described the 20th grade of moving vane blade tip seal 20 and the 21st grade of moving vane blade tip seal 21, low voltage partition plate packing 5 is housed.
In the present embodiment, between described the 21st grade of moving vane blade tip seal 21 and the 22nd grade of moving vane blade tip seal 22, low voltage partition plate packing 5 is housed.
In the present embodiment, between described the 22nd grade of moving vane blade tip seal 22 and the 23rd grade of moving vane blade tip seal 23, low voltage partition plate packing 5 is housed.
In the present embodiment, between described the 20th grade of moving vane blade tip seal 20 and the 24th grade of moving vane blade tip seal 24, shunting ring 10 is housed.
Before and after the described low pressure of the present embodiment, the working method of shaft seal is: the gas in vapour condenser enters the steam supply chamber of the front shaft seal of low pressure, and to the both sides dividing plate, flow respectively, the forward and reverse totally 8 pairs of dividing plates of low-pressure section, adopt the directly welded structure, stator blade all adopts the bending blade profile, the stator blade lagging edge is repaiied and is thinned to 0.38mm, and low voltage partition plate, axle head adopt straight flat tooth packing, and the leaf top adopts the broach packing.The L O section outer shroud is provided with dehumidification structure, and the little water droplet in steam flow, in the effect of centrifugal force falls into moisture-catcher, is walked around last stage movable vane, directly enters steam-expelling port, can effectively alleviate the water erosion phenomenon of last stage movable vane.All dividing plate splits adopt bolton, and during maintenance, inner casing need not hang out.Last two-stage dividing plate adopts the guide ring 4 seamlessly transitted to replace, and the steam after acting covers into vapour condenser by steam discharge guide ring 4 two.
More multioperation is all known for those of ordinary skills, repeats no more.
Before and after low pressure in the present embodiment, shaft seal can effectively alleviate the water erosion phenomenon of last stage movable vane, avoids air to bleed, and improves energy transfer efficiency, in the actual use of engineering, has the reduction energy loss, improves the good effect of heating efficiency.
Claims (15)
1. shaft seal before and after low pressure, it comprises front shaft seal, and this front axle big envelope is contained in the low pressure rotor outside, and this low pressure rotor comprises at least one dividing plate, and this dividing plate comprises stator blade, moving vane, static cascade and Ye Ding, it is characterized in that: described dividing plate comprises two pressure levels.
2. shaft seal before and after low pressure as claimed in claim 1, it is characterized in that: each pressure level comprises four dividing plates.
3. shaft seal before and after low pressure as claimed in claim 1, it is characterized in that: described moving vane top comprises the moving vane blade tip seal.
4. shaft seal before and after as described as claim 1 or 3 low pressure, it is characterized in that: described moving vane adopts and carries the shroud round linking, and moving blade ' s shroud band is processed as interior tiltedly outer flat structure.
5. shaft seal before and after low pressure as claimed in claim 1, is characterized in that: between described dividing plate, diaphragm gland is housed.
6. shaft seal before and after low pressure as claimed in claim 1, it is characterized in that: except last stage movable vane, the moving vane top adopts dredges tooth-like adjustable packing.
7. shaft seal before and after low pressure as claimed in claim 1, it is characterized in that: described dividing plate all adopts the Weldable Steel dividing plate.
8. shaft seal before and after low pressure as claimed in claim 1, is characterized in that: described dividing plate employing directly welded structure.
9. shaft seal before and after low pressure as claimed in claim 1, is characterized in that: described stator blade employing bending blade profile.
10. shaft seal before and after as described as claim 1 or 9 low pressure, it is characterized in that: described stator blade trailing edge thickness is 0.38mm.
11. shaft seal before and after low pressure as claimed in claim 1 is characterized in that: the axle head of described dividing plate adopts straight flat tooth packing.
12. shaft seal before and after low pressure as claimed in claim 1 is characterized in that: the leaf top of described dividing plate adopts the broach packing.
13. shaft seal before and after low pressure as claimed in claim 1, it is characterized in that: the L O section outer shroud is provided with dehumidification structure, and the little water droplet in steam flow is in the effect of centrifugal force falls into moisture-catcher.
14. shaft seal before and after low pressure as claimed in claim 1 is characterized in that: all dividing plate splits adopt bolton.
15. shaft seal before and after low pressure as claimed in claim 1 is characterized in that: last two-stage dividing plate adopts the guide ring seamlessly transitted to replace, and the steam after acting covers into vapour condenser by steam discharge guide ring two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320301484.4U CN203374323U (en) | 2013-05-24 | 2013-05-29 | Low-pressure front-back shaft sealing parts |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310197546 | 2013-05-24 | ||
| CN201310197546.6 | 2013-05-24 | ||
| CN201320301484.4U CN203374323U (en) | 2013-05-24 | 2013-05-29 | Low-pressure front-back shaft sealing parts |
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| CN203374323U true CN203374323U (en) | 2014-01-01 |
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Family Applications (14)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320301505.2U Expired - Fee Related CN203374320U (en) | 2013-05-24 | 2013-05-29 | Low-pressure rotor for steam turbine double-rotor exchanging circulating water heat supply |
| CN201320301790.8U Expired - Fee Related CN203374322U (en) | 2013-05-24 | 2013-05-29 | Low-pressure separating board for steam turbine double-rotor exchanging circulating water heat supply |
| CN201320301712.8U Expired - Fee Related CN203374326U (en) | 2013-05-24 | 2013-05-29 | Optimized rear cylinder water spray system |
| CN201320301788.0U Expired - Fee Related CN203374321U (en) | 2013-05-24 | 2013-05-29 | Moving blade of low-pressure rotor |
| CN201310206163.0A Expired - Fee Related CN103291391B (en) | 2013-05-24 | 2013-05-29 | A kind of steam turbine power generation heating system with double-mode |
| CN201320301484.4U Expired - Fee Related CN203374323U (en) | 2013-05-24 | 2013-05-29 | Low-pressure front-back shaft sealing parts |
| CN201310206097.7A Expired - Fee Related CN103292383B (en) | 2013-05-24 | 2013-05-29 | A kind of operation control operation method of circulating water heating unit |
| CN201320301482.5U Expired - Fee Related CN203374324U (en) | 2013-05-24 | 2013-05-29 | Low-pressure circulating component |
| CN201310206093.9A Expired - Fee Related CN103306758B (en) | 2013-05-24 | 2013-05-29 | A kind of control method of monitored parameter under high back pressure supplies thermal condition |
| CN201320301786.1U Expired - Fee Related CN203374325U (en) | 2013-05-24 | 2013-05-29 | Connecting structure between condenser throat portion and steam turbine exhaust port |
| CN201310208998.XA Expired - Fee Related CN103306753B (en) | 2013-05-24 | 2013-05-30 | A kind of steam turbine set cooling water system and chilled(cooling) water supply (CWS) method |
| CN201310208872.2A Expired - Fee Related CN103382860B (en) | 2013-05-24 | 2013-05-30 | Steam turbine power generation heating system controlling method |
| CN201320355675.9U Expired - Fee Related CN203374329U (en) | 2013-05-24 | 2013-06-21 | Low pressure through-flow structure |
| CN201320355671.0U Expired - Fee Related CN203374328U (en) | 2013-05-24 | 2013-06-21 | Clapboard combination structure for steam turbine |
Family Applications Before (5)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320301505.2U Expired - Fee Related CN203374320U (en) | 2013-05-24 | 2013-05-29 | Low-pressure rotor for steam turbine double-rotor exchanging circulating water heat supply |
| CN201320301790.8U Expired - Fee Related CN203374322U (en) | 2013-05-24 | 2013-05-29 | Low-pressure separating board for steam turbine double-rotor exchanging circulating water heat supply |
| CN201320301712.8U Expired - Fee Related CN203374326U (en) | 2013-05-24 | 2013-05-29 | Optimized rear cylinder water spray system |
| CN201320301788.0U Expired - Fee Related CN203374321U (en) | 2013-05-24 | 2013-05-29 | Moving blade of low-pressure rotor |
| CN201310206163.0A Expired - Fee Related CN103291391B (en) | 2013-05-24 | 2013-05-29 | A kind of steam turbine power generation heating system with double-mode |
Family Applications After (8)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310206097.7A Expired - Fee Related CN103292383B (en) | 2013-05-24 | 2013-05-29 | A kind of operation control operation method of circulating water heating unit |
| CN201320301482.5U Expired - Fee Related CN203374324U (en) | 2013-05-24 | 2013-05-29 | Low-pressure circulating component |
| CN201310206093.9A Expired - Fee Related CN103306758B (en) | 2013-05-24 | 2013-05-29 | A kind of control method of monitored parameter under high back pressure supplies thermal condition |
| CN201320301786.1U Expired - Fee Related CN203374325U (en) | 2013-05-24 | 2013-05-29 | Connecting structure between condenser throat portion and steam turbine exhaust port |
| CN201310208998.XA Expired - Fee Related CN103306753B (en) | 2013-05-24 | 2013-05-30 | A kind of steam turbine set cooling water system and chilled(cooling) water supply (CWS) method |
| CN201310208872.2A Expired - Fee Related CN103382860B (en) | 2013-05-24 | 2013-05-30 | Steam turbine power generation heating system controlling method |
| CN201320355675.9U Expired - Fee Related CN203374329U (en) | 2013-05-24 | 2013-06-21 | Low pressure through-flow structure |
| CN201320355671.0U Expired - Fee Related CN203374328U (en) | 2013-05-24 | 2013-06-21 | Clapboard combination structure for steam turbine |
Country Status (1)
| Country | Link |
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| CN (14) | CN203374320U (en) |
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| CN107355540A (en) * | 2017-08-18 | 2017-11-17 | 国网湖南省电力公司 | Gap adaptively adjusts sealing structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN203374328U (en) | 2014-01-01 |
| CN103306753B (en) | 2015-08-12 |
| CN103306758A (en) | 2013-09-18 |
| CN203374324U (en) | 2014-01-01 |
| CN203374321U (en) | 2014-01-01 |
| CN103291391B (en) | 2016-08-10 |
| CN103306758B (en) | 2016-06-01 |
| CN203374322U (en) | 2014-01-01 |
| CN103382860A (en) | 2013-11-06 |
| CN103292383B (en) | 2016-03-23 |
| CN203374329U (en) | 2014-01-01 |
| CN203374320U (en) | 2014-01-01 |
| CN103306753A (en) | 2013-09-18 |
| CN103292383A (en) | 2013-09-11 |
| CN203374326U (en) | 2014-01-01 |
| CN103291391A (en) | 2013-09-11 |
| CN203374325U (en) | 2014-01-01 |
| CN103382860B (en) | 2015-12-02 |
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