CN106246351B - Gas turbine oil pump - Google Patents
Gas turbine oil pump Download PDFInfo
- Publication number
- CN106246351B CN106246351B CN201610785917.6A CN201610785917A CN106246351B CN 106246351 B CN106246351 B CN 106246351B CN 201610785917 A CN201610785917 A CN 201610785917A CN 106246351 B CN106246351 B CN 106246351B
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- China
- Prior art keywords
- oil
- gas turbine
- lubricating oil
- level assembly
- outlet
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/06—Arrangements of bearings; Lubricating
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a kind of gas turbine oil pump, including the housing for being connected with gas turbine, it is integrally disposed in housing to be used for by supercharging level assembly that lubricating oil pumps out from oil tank, for the oil return level assembly after flowing through the lubricating oil convergence after each transmission parts of gas turbine and being pressurized back to oil tank, the import of level assembly and the outlet of oil return level assembly are pressurized through pipeline communication to oil tank, housing is provided with multiple outlet line joints of the outlet with being pressurized level assembly, multiple return line joints with the inlet communication of oil return level assembly.The invention enables gas turbine oil pump it is compact-sized, beneficial to reducing the overall volume of gas turbine, reduce complete machine annex quantity, reduce main screw lift, and reliability and maintainability greatly improve.
Description
Technical field
The present invention relates to gas turbine field, especially, is related to a kind of gas turbine oil pump.
Background technology
Ground combustion machine is needed to be lubricated its transmission parts using lubricating oil at work, cooled down, impurity removal, is obturaged, is resisted
Corrosion etc., at this moment just need oil pump to be pressurized to the lubricating oil of combustion engine and oil return, the lubricating oil of combustion engine is carried out enclosed
Circulation, the realization of various functions is completed on the lube use rate of very little.Prior art needs on the basis of the realization of these functions
Substantial amounts of oil pump (such as main oil pump, auxiliary oil pump, auxiliary scavenge oil pump) and oil filter is wanted (main oil filter, thick oil filter, to return
Oily filter etc.), and each oil pump, oil filter it is separately positioned in gas turbine everywhere, so considerably increase the quantity and complete machine of annex
Structure, Maintainability And Reliability substantially reduces, and whole system is excessively complicated, can not meet that ground combustion machine is compact-sized, weight
The characteristics of light.
The content of the invention
The invention provides a kind of gas turbine oil pump, with solve existing combustion engine oil pump it is complicated, can
By the limited technical problem of property and maintainability.
The technical solution adopted by the present invention is as follows：
A kind of gas turbine oil pump, including the housing for being connected with gas turbine, it is integrally disposed in housing to be used for
By supercharging level assembly that lubricating oil pumps out from oil tank, for being converged and supercharging to flowing through the lubricating oil after each transmission parts of gas turbine
Afterwards back to the oil return level assembly of oil tank, the import of level assembly and the outlet of oil return level assembly are pressurized through pipeline communication to cunning
Fuel tank, housing are provided with multiple outlet line joints of the outlet with being pressurized level assembly, the import company with oil return level assembly
Logical multiple return line joints.
Further, supercharging level assembly is gear pump, and the driving gear of gear pump introduces gas turbine work through driving member
Driving force and drive driven gear work so that lubricating oil is pumped into booster cavity.
Further, it is provided for carrying out lubricating oil the oil filter of filtration treatment in booster cavity, the bottom of oil filter is through list
Outlet line joint is connected to valve, by the lubricating oil after filtering through pipeline to gas turbine place to be lubricated.
Further, it is communicated with being pressurized the import and outlet of level assembly outside booster cavity, for adjusting lubricating oil work pressure
The pressure regulating valve of power.
Further, pressure regulating valve include valve cast, with valve cast coordinate butterfly valve, driving butterfly valve action with
Control the shutter spring of on or off and for the elastic deformation amount of governor valve spring to control the tune of its Opening pressure
Complete machine structure.
Further, oil filter is net type cleaner, including hollow hollow backbone and the outer ring located at hollow backbone
Filtering component, annular filtering component are loose structure, lubricating oil enter annular filtering component and the region being pressurized between cavity wall and
Enter the inner chamber of hollow backbone after annular filtering component filters, and the bottom of hollow backbone is communicated to flowline through check valve
Pipeline connector.
Further, the bottom of hollow backbone is provided with the strainer cover being connected with booster cavity inner wall sealing, and hollow backbone exists
The separator disc being connected with booster cavity inner wall sealing is provided with strainer cover, lubricating oil transition is formed between separator disc and strainer cover
Chamber, lubricating oil adapter cavity connection outlet line joint.
Further, gas turbine oil pump of the present invention also includes：
For detecting in lubricating oil adapter cavity the pressure sensor of lubricating oil pressure and by the first of the porch of booster cavity
Logical valve, the first bypass flap import lubricating oil within hollow backbone under the control of pressure sensor.
Further, the bypass flap of outlet second of oil return level assembly is connected with oil cooler, to be dissipated to lubricating oil
Oil tank is imported after heat treatment.
Further, oil return level assembly is multistage scavenge oil pump, return line joint through pipeline communication to driving front casing, on
It is driven at least one in casing, central transmission casing, inlet casing, reduction case, turbine bearing.
The invention has the advantages that：
Gas turbine oil pump of the present invention, pass through the integrally disposed increasing for lubricating oil to be pumped out from oil tank in housing
Arbitrarily downgrade component, for flow through the lubricating oil after each transmission parts of gas turbine converge and supercharging after back to oil tank oil return level
Component, is pressurized the import of level assembly and the outlet of oil return level assembly is provided with and supercharging through pipeline communication to oil tank, housing
Multiple outlet line joints of the outlet of level assembly, multiple return line joints with the inlet communication of oil return level assembly,
So that gas turbine oil pump is compact-sized, overall volume, reduction complete machine annex quantity, reduction beneficial to reduction gas turbine
Main screw lift, and reliability and maintainability greatly improve.
In addition to objects, features and advantages described above, the present invention also has other objects, features and advantages.
Below with reference to accompanying drawings, the present invention is further detailed explanation.
Brief description of the drawings
The accompanying drawing for forming the part of the application is used for providing a further understanding of the present invention, schematic reality of the invention
Apply example and its illustrate to be used to explain the present invention, do not form inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the outline structural diagram of preferred embodiment of the present invention gas turbine oil pump；
Fig. 2 is the internal structure schematic diagram of preferred embodiment of the present invention gas turbine oil pump；
Fig. 3 is the structural representation of oil filter in the preferred embodiment of the present invention.
Description of reference numerals：
1st, housing；
2nd, it is pressurized level assembly；
3rd, oil return level assembly；
4th, oil tank；
5th, outlet line joint；
6th, return line joint；
7th, booster cavity；
8th, oil filter；81st, outer layer cleaner；82nd, annular filtering component；83rd, hollow backbone；
84th, strainer cover；85th, separator disc；86th, the first sealing ring；87th, the second sealing ring；88th, lubricating oil adapter cavity；
9th, check valve；
10th, pressure regulating valve；
11st, pressure sensor；
12nd, the first bypass flap；
13rd, the second bypass flap；
14th, oil cooler.
Embodiment
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can phase
Mutually combination.Describe the present invention in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
The preferred embodiments of the present invention provide a kind of gas turbine oil pump, reference picture 1 and Fig. 2, and the present embodiment is slided
Oil pump includes being used for the housing 1 that is connected with gas turbine, the integrally disposed increasing for lubricating oil to be pumped out from oil tank 4 in housing 1
Arbitrarily downgrade component 2, for flow through the lubricating oil after each transmission parts of gas turbine converge and supercharging after back to oil tank 4 oil return
Level assembly 3, is pressurized the import of level assembly 2 and the outlet of oil return level assembly 3 is provided with through pipeline communication to oil tank 4, housing 1
Multiple outlet line joints 5 with the outlet of supercharging level assembly 2, multiple oil returns with the inlet communication of oil return level assembly 3
Pipe joint 6.Multiple outlet line joints 5 at pipeline communication to each drive mechanism of gas turbine through lubricating, multiple return lines
Lubricating oil after work is reclaimed and is back to oil tank 4 through oil return level assembly 3 by joint 6.The present embodiment uses the structure of integrated form
Design, compared with existing scattered oil pump structure, simplifies the structure design of system, it is compact-sized to meet ground gas turbine
Requirement, beneficial to reducing the overall volume of gas turbine, reduce complete machine annex quantity, reduce main screw lift, and reliability and dimension
Shield property greatly improves.
In the present embodiment, housing 1 is formed using aluminium alloy casting, and on the middle biography casing of gas turbine so that
Gas turbine compact overall structure.
Alternatively, in the present embodiment, supercharging level assembly 2 is gear pump, and lubricating oil is exported using the effect enhancing of gear pump
Pressure.In the present embodiment, the driving gear of gear pump introduces the driving force of gas turbine work through driving member and drives driven tooth
Work is taken turns so that lubricating oil is pumped into booster cavity 7.Preferably, gear pump by vertical spring axle by ground gas turbine upper gear box
Rotating speed is transferred to the tail end of driving gear, and then drives gear pump work by the operation power of gas turbine, will be slided with realizing
Lubricating oil in fuel tank 4 pumps out, without being separately provided actuating unit.
Preferably, it is provided for carrying out lubricating oil the oil filter 8 of filtration treatment in booster cavity 7, the bottom of oil filter 8 is through list
Outlet line joint 5 is connected to valve 9, by the lubricating oil after filtering through pipeline to gas turbine place to be lubricated.Work as combustion gas
After turbine starts, the automatic start of level assembly 2 is pressurized, lubricating oil enters booster cavity 7, the lubricating oil after being pressurized by gear from oil tank 4
Into oil filter, exported after filtered processing, and lubricating oil is reliably exported to outlet line using pressure opening check valve 9 and connect
First 5, avoiding the backflow of lubricating oil causes.
Preferably, it is communicated with being pressurized the import and outlet of level assembly 2 outside booster cavity 7, for adjusting lubricating oil work pressure
The pressure regulating valve 10 of power.Reference picture 2, in the present embodiment, pressure regulating valve 10 is set on the side of booster cavity 7, pressure regulating valve 10 wraps
Valve cast, the butterfly valve coordinated with valve cast, driving butterfly valve is included to act to control the shutter spring of on or off
And for the elastic deformation amount of governor valve spring to control the adjustment mechanism of its Opening pressure.The present embodiment adjustment mechanism is band
The adjusting screw of lock nut, pressure regulating valve 10 are fixed on oil pump through stud, and shutter spring pressure is 3.5+
0.3kgf/cm2, the unlatching of the adjusting screw change pressure regulating valve of pressure regulating valve can be adjusted according to requirement of the complete machine to lubricating oil pressure
Pressure.When the outlet pressure of supercharging level assembly 2 is higher than 3.5+0.3kgf/cm2When, bypass flap while shutter spring is compressed
Open, part lubricating oil returns to its import from booster cavity outlet, to control the operating pressure of lubricating oil, it is necessary to which explanation is：Herein
Pressure regulating value is merely illustrative, not to the limitation of claims.
Reference picture 3, the present embodiment oil filter 8 are net type cleaner, including hollow hollow backbone 83 and located at hollow bone
Annular filtering component 82 outside frame 83, annular filtering component 82 are loose structure, and lubricating oil enters annular filtering component 82 and supercharging
Region between the inwall of chamber 7 and the inner chamber for entering hollow backbone 83 after the filtering of annular filtering component 82, and hollow backbone 83
Bottom is communicated to outlet line joint 5 through check valve 9.The present embodiment annular filtering component 82 includes the filtering member of multiple plate-likes
Part, filter bores are opened up on filter element, in the present embodiment, filter bores ensure that filtering accuracy be 0.063mm, and adjacent filtering is first
Sealed ring zero-clearance linking between part, and the tightness for ensureing fitting is installed through locking nut.
Preferably, the bottom of hollow backbone 83 is provided with the strainer cover 84 being connected with the inner wall sealing of booster cavity 7, hollow backbone
83 are provided with the separator disc 85 that be connected with the inner wall sealing of booster cavity 7 on strainer cover 84, separator disc 85 and strainer cover 84 it
Between form lubricating oil adapter cavity 88, lubricating oil adapter cavity 88 connects outlet line joint 5.In the present embodiment, strainer cover 84 and supercharging
First sealing ring 86 is set between the inwall of chamber 7, the second sealing ring 87 is set between separator disc 85 and the inwall of booster cavity 7.It is sliding
The course of work of oily filter 8 is as follows：Lubricating oil enters net type cleaner from booster cavity 7 and is full of annular filtering component 82 and the lubricating oil pump housing
Chamber between inwall, lubricating oil are entered under pressure through the net of filter element by the lubricating oil of filtering by the hole on filter element
Hollow backbone 83, when reaching 0.2~0.3kgf/cm by the lubricating oil pressure of filtering2When, check valve 9 is opened, and lubricating oil is through hollow bone
The hole of frame 83 flows to lubricating oil adapter cavity 88, then goes to lubricate into combustion engine from lubricating oil adapter cavity 88 along the B oil ducts on oil pump.
Preferably, the present embodiment gas turbine oil pump also includes：For detecting lubricating oil pressure in lubricating oil adapter cavity 88
Pressure sensor 11 and the first bypass flap 12 located at the porch of booster cavity 7, the first bypass flap 12 is in pressure sensing
Lubricating oil is imported within hollow backbone 83 under the control of device 11.Herein, pressure sensor 11 detects the cunning at lubricating oil adapter cavity 88
Oil pressure, when being less than predetermined threshold value with oil outlet pressure by the first bypass flap 12 by lubricating oil around filter element export to
Outlet line joint 5, in order to avoid the reliability of the work of lubricating oil is influenceed when filter element blocks.The bypass flap of the present embodiment first
12 are located at the upper end of hollow backbone 83, import the inner chamber of hollow backbone 83 straight through lubricating oil with the upper end through hollow backbone 83, then
Exported through check valve 9, lubricating oil adapter cavity 88, outlet line joint 5.It is highly preferred that the present embodiment oil filter 8 also includes being located at
The booster cavity porch and outer layer cleaner 81 on the hollow backbone 83, outer layer cleaner 81 realize the thick mistake to lubricating oil
Filter, to improve the reliability of lubricating oil work, i.e., when filter element blocks, the lubricating oil through coarse filtration supplies through the first bypass flap 12
Gas turbine, had both met the reliability of lubricating oil pump work, effectively prevent lubricating oil again and does not filter caused performance impairment completely.
In the present embodiment, the second bypass flap of outlet 13 of oil return level assembly 3 is connected with oil cooler 14, with right
Oil tank 4 is imported after lubricating oil radiating treatment.Preferably, temperature detector is set on the outlet conduit of oil return level assembly 3, by the of second
The logical on or off under the control of temperature detector of valve 13, with when returning-oil temperature exceedes given threshold, by second
Logical valve 13, oil cooler 14 are back to oil tank 4 so that control is more accurate.
Preferably, oil return level assembly 3 is multistage scavenge oil pump, return line joint 6 through pipeline communication to driving front casing, on
It is driven at least one in casing, central transmission casing, inlet casing, reduction case, turbine bearing.In the present embodiment, return
Oily level assembly 3 includes two sets of scavenge oil pumps, wherein, a set of is level Four scavenge oil pump, and another set of is six grades of scavenge oil pumps, collectively forms ten grades
Scavenge oil pump.The oil pumping position of level Four scavenge oil pump includes：Two groups from the 6th supporting oil pumping of decelerator and power turbine, one group therefrom
The oil pumping of centre transmission casing, one group of transmission casing oil pumping in the past；The oil pumping position of six grades of scavenge oil pumps includes：One group from upper driver casket
Oil pumping, one group from the oil pumping of underdrive casing, two groups from low-pressure compressor front support (inlet casing) oil pumping, two groups from low pressure and height
Press the oil pumping of turbine rear support.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (6)
1. a kind of gas turbine oil pump, it is characterised in that including the housing (1) for being connected with the gas turbine, institute
State in housing (1) it is integrally disposed for lubricating oil is pumped out from oil tank (4) supercharging level assembly (2), for flowing through the combustion
Back to the oil return level assembly (3) of the oil tank (4), the increasing after lubricating oil convergence and supercharging after each transmission parts of gas-turbine
Arbitrarily downgrade component (2) import and the oil return level assembly (3) outlet through pipeline communication to the oil tank (4), the shell
Body (1) is provided with and multiple outlet line joints (5) of the outlet of the supercharging level assembly (2) and the oil return level group
Multiple return line joints (6) of the inlet communication of part (3)；The supercharging level assembly (2) is gear pump, the master of the gear pump
Moving gear introduces the driving force of the gas turbine work through driving member and drives driven gear work that lubricating oil is pumped into supercharging
Chamber (7)；It is provided for carrying out lubricating oil the oil filter (8) of filtration treatment, the bottom of the oil filter (8) in the booster cavity (7)
End connects the outlet line joint (5) through check valve (9), by the lubricating oil after filtering through pipeline to the combustion gas wheel
Machine place to be lubricated；The oil filter (8) is net type cleaner, including hollow hollow backbone (83) and located at the hollow backbone
(83) annular filtering component (82) outside, the annular filtering component (82) are loose structure, and lubricating oil enters the annular filtering
Region between component (82) and the booster cavity (7) inwall and enter the sky after annular filtering component (82) filtering
The inner chamber of heart skeleton (83), and the bottom of the hollow backbone (83) is communicated to the outlet line through the check valve (9)
Joint (5)；The bottom of the hollow backbone (83) is provided with the strainer cover (84) being connected with the booster cavity (7) inner wall sealing,
The hollow backbone (83) is provided with the separator disc being connected with the booster cavity (7) inner wall sealing on the strainer cover (84)
(85) lubricating oil adapter cavity (88), the lubricating oil adapter cavity, are formed between the separator disc (85) and the strainer cover (84)
(88) the outlet line joint (5) is connected.
2. gas turbine oil pump according to claim 1, it is characterised in that
The import and outlet of the supercharging level assembly (2) are communicated with outside the booster cavity (7), for adjusting lubricating oil work pressure
The pressure regulating valve (10) of power.
3. gas turbine oil pump according to claim 2, it is characterised in that
The pressure regulating valve (10) includes valve cast, the butterfly valve coordinated with the valve cast, the driving butterfly valve and moved
Make to control the shutter spring of on or off and for adjusting the elastic deformation amount of the shutter spring to control its unlatching
The adjustment mechanism of pressure.
4. gas turbine oil pump according to claim 1, it is characterised in that also include：
For detecting the pressure sensor (11) of the interior lubricating oil pressure of the lubricating oil adapter cavity (88) and located at the booster cavity (7)
The first bypass flap (12) of porch, first bypass flap (12) will be sliding under the control of the pressure sensor (11)
Oil is imported within the hollow backbone (83).
5. gas turbine oil pump according to claim 4, it is characterised in that
The bypass flap of outlet second (13) of the oil return level assembly (3) is connected with oil cooler (14), with to lubricating oil
The oil tank (4) is imported after radiating treatment.
6. gas turbine oil pump according to claim 5, it is characterised in that
The oil return level assembly (3) is multistage scavenge oil pump, the return line joint (6) through pipeline communication to driving front casing,
In upper driver casket, central transmission casing, inlet casing, reduction case, turbine bearing at least one at.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610785917.6A CN106246351B (en) | 2016-08-31 | 2016-08-31 | Gas turbine oil pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610785917.6A CN106246351B (en) | 2016-08-31 | 2016-08-31 | Gas turbine oil pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106246351A CN106246351A (en) | 2016-12-21 |
| CN106246351B true CN106246351B (en) | 2018-03-02 |
Family
ID=58079675
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610785917.6A Active CN106246351B (en) | 2016-08-31 | 2016-08-31 | Gas turbine oil pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106246351B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109139263A (en) * | 2017-06-28 | 2019-01-04 | 中国航发贵阳发动机设计研究所 | A kind of second level scavenge oil pump of aero-engine |
| CN111608761B (en) * | 2020-06-02 | 2022-06-07 | 四川省天域航通科技有限公司 | Large-scale freight transportation unmanned aerial vehicle system of lubricating oil |
| CN112012831A (en) * | 2020-08-28 | 2020-12-01 | 中国航发贵阳发动机设计研究所 | Combined type aero-engine lubricating oil accessory |
| CN112324575B (en) * | 2020-10-29 | 2021-10-12 | 中国航发南方工业有限公司 | Lubricating oil filter comprising double-acting valve device |
| CN113844660A (en) * | 2021-10-09 | 2021-12-28 | 中国航发沈阳发动机研究所 | Integrated accessory casing structure on airplane |
| CN115492757B (en) * | 2022-09-23 | 2023-07-28 | 江西中发天信航空发动机科技有限公司 | Internally engaged rotor oil pump |
| CN115571349B (en) * | 2022-11-10 | 2023-05-02 | 上海尚实航空发动机股份有限公司 | Integrated lubricating oil supply system of auxiliary power device of airplane and airplane |
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| CN203500810U (en) * | 2013-09-03 | 2014-03-26 | 中国航空工业集团公司沈阳发动机设计研究所 | Two-stage plug-in lubricating pump unit |
| CN104315321A (en) * | 2014-09-12 | 2015-01-28 | 江苏江海润液设备有限公司 | Novel lubricating oil device of gas turbine |
| CN204212860U (en) * | 2014-11-19 | 2015-03-18 | 哈尔滨广瀚燃气轮机有限公司 | Turbine oil assembly |
| CN204477665U (en) * | 2014-12-18 | 2015-07-15 | 中国南方航空工业(集团)有限公司 | Lubricating oil pump |
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2016
- 2016-08-31 CN CN201610785917.6A patent/CN106246351B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203500810U (en) * | 2013-09-03 | 2014-03-26 | 中国航空工业集团公司沈阳发动机设计研究所 | Two-stage plug-in lubricating pump unit |
| CN104315321A (en) * | 2014-09-12 | 2015-01-28 | 江苏江海润液设备有限公司 | Novel lubricating oil device of gas turbine |
| CN204212860U (en) * | 2014-11-19 | 2015-03-18 | 哈尔滨广瀚燃气轮机有限公司 | Turbine oil assembly |
| CN204477665U (en) * | 2014-12-18 | 2015-07-15 | 中国南方航空工业(集团)有限公司 | Lubricating oil pump |
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| Publication number | Publication date |
|---|---|
| CN106246351A (en) | 2016-12-21 |
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Address after: 412002 Dong Jiaduan, Zhuzhou, Hunan Patentee after: China Hangfa South Industrial Co. Ltd. Address before: 412002 Dong Jiaduan, Zhuzhou, Hunan Patentee before: China Southern Airlines Industry (Group) Co., Ltd. |
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