CN112160804B - Engine exhaust pipe fairing - Google Patents
Engine exhaust pipe fairing Download PDFInfo
- Publication number
- CN112160804B CN112160804B CN202011021019.6A CN202011021019A CN112160804B CN 112160804 B CN112160804 B CN 112160804B CN 202011021019 A CN202011021019 A CN 202011021019A CN 112160804 B CN112160804 B CN 112160804B
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- CN
- China
- Prior art keywords
- skin
- outer cover
- exhaust pipe
- cover plate
- engine exhaust
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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
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/30—Exhaust heads, chambers, or the like
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/08—Cooling; Heating; Heat-insulation
- F01D25/12—Cooling
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Silencers (AREA)
Abstract
The invention belongs to the technical field of functional structure design of helicopters, and discloses an engine exhaust pipe fairing. The method comprises the following steps: the outer cover plate comprises a skin with reinforcing ribs, an inner partition plate and an outer cover plate; the reinforcing ribs are arranged on the inner side of the skin; the front end of the skin is connected with the firewall through screws, and two sides of the skin are connected with the engine body platform through screws; a C-shaped opening is formed in the middle part of the front end of the skin at the position towards the left side; the inner baffle is an approximate quarter ellipsoid, the C-shaped edge of the plane where the long axis is located is matched with the C-shaped opening of the skin, and the C-shaped edge of the plane where the short axis is located is matched with the firewall; the inner partition plate C-shaped edge is connected with the skin and the firewall through the flange edge; the outer cover plate is a cambered surface matched with the C-shaped opening of the skin; the outer cover plate is sequentially connected with the skin and the inner baffle plate through screws; the outer cover plate is provided with a through hole, and the engine exhaust pipe passes through the through hole; the engine exhaust pipe is arranged between the outer cover plate and the inner partition plate; the outer cover plate and the skin form a complete aerodynamic shape.
Description
Technical Field
The invention belongs to the technical field of functional structure design of helicopters, and particularly relates to an engine exhaust pipe fairing.
Background
The exhaust pipe fairing of a helicopter engine of a certain model is used for maintaining the aerodynamic appearance and protecting systems such as a transmission system on a power platform, and the systems need daily inspection and maintenance on the helicopter. Therefore, the design of the engine exhaust pipe fairing is mainly to be resistant to high-temperature gas near the exhaust pipe, reduce the weight as much as possible and improve the maintainability of system equipment on the premise of ensuring the strength and rigidity of the fairing.
The fairing near the exhaust pipe of the existing helicopter engine has irregular appearance, generally adopts metal sheet metal structures such as titanium alloy, stainless steel and the like, has more parts, large weight cost and difficult part manufacturing; or the common composite material is easy to bake and corrode after being contacted with high temperature for a long time. These all add to the cost of manufacture and use.
Disclosure of Invention
The purpose of the invention is as follows: in order to reduce the manufacturing difficulty of the exhaust pipe fairing, reduce the weight of the fairing structure, ensure the strength and rigidity of the fairing, protect systems such as transmission and the like, the invention designs the engine exhaust pipe fairing by adopting a proper high-temperature resistant composite material and a proper structural design.
The technical scheme of the invention is as follows:
an engine exhaust pipe fairing comprising: the outer cover plate comprises a skin with reinforcing ribs, an inner partition plate and an outer cover plate;
the reinforcing ribs are arranged on the inner side of the skin; the front end of the skin is connected with the firewall through a screw, and two sides of the skin are connected with the engine body platform through screws; a C-shaped opening is formed in the middle of the front end of the skin at the position which is slightly to the left; the inner partition plate is an approximate quarter ellipsoid, the C-shaped edge of the plane where the long axis is located is matched with the C-shaped opening of the skin, and the C-shaped edge of the plane where the short axis is located is matched with the firewall; the inner partition plate C-shaped edge is connected with the skin and the firewall through the flange edge; the outer cover plate is a cambered surface matched with the C-shaped opening of the skin; the outer cover plate is sequentially connected with the skin and the inner partition plate through screws; the outer cover plate is provided with a through hole, and an engine exhaust pipe penetrates through the through hole; the engine exhaust pipe is arranged between the outer cover plate and the inner partition plate; the outer cover plate and the skin form a complete pneumatic appearance, the cross section of the pneumatic appearance is U-shaped, and the height of the pneumatic appearance is gradually reduced from front to back.
Further, the interval between the surface of the inner partition plate and the exhaust pipe of the engine is not less than 400mm.
Furthermore, the inner partition plate is provided with water leakage holes which prevent rainwater from being stocked on the concave surface.
Furthermore, the front end of the outer cover plate is provided with a flanging, and the flanging is used for increasing rigidity.
Furthermore, the joint of the rear end of the outer cover plate, the skin and the inner partition plate is provided with vent holes for heat dissipation.
Furthermore, the through hole of the outer cover plate is provided with a flanging.
Furthermore, the fairing also comprises maintenance covering covers arranged on two sides of the covering; one end of the maintenance opening cover is connected with the machine body platform through a hinge, and the other end of the maintenance opening cover is connected with the skin through a quick-release lock.
Furthermore, the skin, the outer cover plate, the inner baffle plate, the maintenance opening cover and the reinforcing ribs are all made of polyimide resin and carbon fiber materials, and can continuously work for 8 hours at the temperature of between 45 ℃ below zero and 260 ℃ or continuously work for 1 hour at 290 ℃.
Furthermore, reinforcing ribs are arranged on the inner side of the skin transversely and longitudinally, and the interval between the reinforcing ribs is 200-300 mm.
The invention has the beneficial effects that:
1. the engine exhaust pipe fairing can resist high exhaust temperature, and has the advantages of few parts, low weight cost and simple forming.
2. The box-shaped structure formed by connecting the fairing skin in the form of the wall plate with the reinforced wall, the firewall and the platform ensures the strength, rigidity and structural efficiency of the fairing.
3. The inner partition plate can prevent the exhaust pipe from conducting high temperature to the cabin and protect a system below the exhaust pipe.
4. The aerodynamic appearance that outer cover plate and covering, maintenance flap are constituteed has reduced aerodynamic drag. The hot air is not easy to accumulate between the outer cover plate and the inner baffle plate.
5. The maintenance covering covers on two sides are convenient for daily inspection and maintenance of a system below the fairing. The fairing is used on a certain type machine, and has a good using effect.
Drawings
FIG. 1 is a schematic illustration of the relative positions of a cowling, exhaust duct and firewall;
FIG. 2 is a schematic view of a fairing configuration;
FIG. 3 is a schematic view of a fairing inboard stiffener;
FIG. 4 is a schematic view of an outer cover plate;
FIG. 5 is a schematic view of an inner partition
Description of numbering: 1. the device comprises a firewall 2, an exhaust pipe 3, a fairing 4, an outer cover plate 5, an inner partition plate 6, a fairing skin 7, a left maintenance opening cover 8, a right maintenance opening cover and a reinforcing rib 9.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 and 2, an engine exhaust pipe cowling includes: the maintenance cover comprises a skin with reinforcing ribs, an inner partition plate, an outer cover plate and a maintenance cover, wherein the reinforcing ribs are arranged on the inner side of the skin; the front end of the skin is connected with the firewall through a screw, the inner side of the skin is connected with the engine body platform through a screw, and a C-shaped opening is formed in the middle of the front end of the skin to the left side.
The inner baffle is an approximate quarter ellipsoid, the C-shaped edge of the plane with the long axis is matched with the C-shaped opening of the skin, and the C-shaped edge of the plane with the short axis is matched with the firewall. The inner baffle C-shaped edge is connected with the skin and the firewall through the flange plate.
The outer cover plate is a cambered surface matched with the C-shaped opening of the skin and is sequentially connected with the skin and the inner partition plate through screws. The outer cover plate is provided with a through hole through which the engine exhaust pipe passes. The engine exhaust pipe is placed between the outer cover plate and the inner partition plate.
The maintenance covering covers are arranged on two sides of the covering, one end of each maintenance covering cover is hinged to the machine body platform, and the other end of each maintenance covering cover is connected with the covering through a quick-release lock. The outer cover plate, the maintenance opening cover and the skin form a complete pneumatic appearance, the section of the pneumatic appearance is U-shaped, and the height of the pneumatic appearance is gradually reduced from front to back.
As shown in figure 3, the interval of the reinforcing ribs on the inner side of the skin is 200 mm-300 mm.
As shown in fig. 4, the front end of the outer cover plate is provided with a flange to increase rigidity. And vent holes are arranged at the joints of the rear end of the outer cover plate, the skin and the inner partition plate for heat dissipation. The through hole of the outer cover plate is provided with a flanging to increase rigidity.
As shown in fig. 5, the distance between the surface of the inner baffle plate and the engine exhaust pipe is not less than 400mm. The inner partition plate is provided with water leakage holes to prevent rainwater from being accumulated on the concave surface.
The skin, the outer cover plate, the inner baffle plate, the maintenance opening cover and the reinforcing ribs are all made of polyimide resin and carbon fiber materials, and can continuously work for 8 hours at the temperature of between 45 ℃ below zero and 280 ℃ or continuously work for 1 hour at 290 ℃.
The foregoing is merely a detailed description of the embodiments of the present invention, and some of the conventional techniques are not detailed. The scope of the present invention is not limited thereto, and any changes or substitutions that can be easily made by those skilled in the art within the technical scope of the present invention will be covered by the scope of the present invention. The protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. An engine exhaust pipe fairing characterized in that: the fairing includes: the outer cover plate comprises a skin with reinforcing ribs, an inner partition plate and an outer cover plate; the reinforcing ribs are arranged on the inner side of the skin; the front end of the skin is connected with the firewall through a screw, and two sides of the skin are connected with the engine body platform through screws; a C-shaped opening is formed in the middle of the front end of the skin at the position which is towards the left side; the inner partition plate is an approximate quarter ellipsoid, the C-shaped edge of the plane where the long axis is located is matched with the C-shaped opening of the skin, and the C-shaped edge of the plane where the short axis is located is matched with the firewall; the inner partition plate C-shaped edge is connected with the skin and the firewall through the flange edge; the outer cover plate is a cambered surface matched with the C-shaped opening of the skin; the outer cover plate is sequentially connected with the skin and the inner baffle plate through screws; a through hole is formed in the outer cover plate, and an engine exhaust pipe penetrates through the through hole; the engine exhaust pipe is arranged between the outer cover plate and the inner partition plate; the outer cover plate and the skin form a complete pneumatic appearance, the cross section of the pneumatic appearance is U-shaped, and the height of the pneumatic appearance is gradually reduced from front to back;
the skin, the outer cover plate, the inner partition plate, the maintenance opening cover and the reinforcing ribs are all made of polyimide resin and carbon fiber materials.
2. The engine exhaust pipe fairing as recited in claim 1, wherein: the interval between the surface of the inner baffle plate and the exhaust pipe of the engine is not less than 400mm.
3. The engine exhaust pipe fairing as recited in claim 1, wherein: the inner partition plate is provided with water leakage holes.
4. The engine exhaust pipe fairing as recited in claim 1, wherein: the front end of the outer cover plate is provided with a flanging.
5. The engine exhaust pipe fairing as recited in claim 1, wherein: and air vents are arranged at the joints of the rear ends of the outer cover plates, the skin and the inner partition plate for heat dissipation.
6. The engine exhaust pipe fairing as recited in claim 1, wherein: the through hole of the outer cover plate is provided with a flanging.
7. The engine exhaust pipe fairing as recited in claim 1, wherein: the fairing also comprises maintenance covering covers arranged on two sides of the covering; one end of the maintenance opening cover is connected with the machine body platform through a hinge, and the other end of the maintenance opening cover is connected with the skin through a quick-release lock.
8. The engine exhaust pipe fairing as recited in claim 1, wherein: reinforcing ribs are arranged on the inner side of the skin in the transverse direction and the longitudinal direction, and the interval between the reinforcing ribs is 200-300 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011021019.6A CN112160804B (en) | 2020-09-25 | 2020-09-25 | Engine exhaust pipe fairing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011021019.6A CN112160804B (en) | 2020-09-25 | 2020-09-25 | Engine exhaust pipe fairing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112160804A CN112160804A (en) | 2021-01-01 |
| CN112160804B true CN112160804B (en) | 2023-03-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011021019.6A Active CN112160804B (en) | 2020-09-25 | 2020-09-25 | Engine exhaust pipe fairing |
Country Status (1)
| Country | Link |
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| CN (1) | CN112160804B (en) |
Citations (5)
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|---|---|---|---|---|
| CN206598977U (en) * | 2017-07-03 | 2017-10-31 | 中国直升机设计研究所 | A kind of slidably radome fairing |
| CN109018382A (en) * | 2018-08-07 | 2018-12-18 | 深圳市福来过科技有限公司 | A kind of aircraft engine deformation dome structure |
| CN208360182U (en) * | 2018-05-31 | 2019-01-11 | 今创集团股份有限公司 | Railway vehicle car roof exhaust gas discharges air duct |
| CN109533283A (en) * | 2018-11-12 | 2019-03-29 | 中国直升机设计研究所 | A kind of foldable radome fairing and the helicopter with it |
| CN210681121U (en) * | 2019-10-11 | 2020-06-05 | 中国航空工业集团公司西安飞机设计研究所 | Molded bearing opening cover of airplane |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US4172572A (en) * | 1977-04-28 | 1979-10-30 | Pratt & Whitney Aircraft Of Canada Ltd. | Exhaust stub with end plate |
| US9650149B2 (en) * | 2014-12-08 | 2017-05-16 | Honeywell International Inc. | Fire containment apparatuses for aircraft duct assemblies |
| US10119449B2 (en) * | 2016-08-02 | 2018-11-06 | The Boeing Company | Systems and methods for restraining exhaust gas ducts |
| US10279924B2 (en) * | 2017-05-12 | 2019-05-07 | Bell Helicopter Textron Inc. | Engine exhaust duct mounting assembly |
| US10480386B2 (en) * | 2017-09-22 | 2019-11-19 | Bell Helicopter Textron Inc. | Exhaust manifold for combining system exhaust plume |
| CN107878764B (en) * | 2017-11-29 | 2020-12-29 | 中国直升机设计研究所 | Integral sliding structure of hot wall exhaust pipe of fairing |
| CN109606709A (en) * | 2018-11-14 | 2019-04-12 | 中国直升机设计研究所 | A kind of exhaust pipe mounting structure for helicopter |
| CN110561054B (en) * | 2019-09-30 | 2020-11-13 | 北京星航机电装备有限公司 | Forming method of high-temperature alloy fairing with reinforcing rib structure |
-
2020
- 2020-09-25 CN CN202011021019.6A patent/CN112160804B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206598977U (en) * | 2017-07-03 | 2017-10-31 | 中国直升机设计研究所 | A kind of slidably radome fairing |
| CN208360182U (en) * | 2018-05-31 | 2019-01-11 | 今创集团股份有限公司 | Railway vehicle car roof exhaust gas discharges air duct |
| CN109018382A (en) * | 2018-08-07 | 2018-12-18 | 深圳市福来过科技有限公司 | A kind of aircraft engine deformation dome structure |
| CN109533283A (en) * | 2018-11-12 | 2019-03-29 | 中国直升机设计研究所 | A kind of foldable radome fairing and the helicopter with it |
| CN210681121U (en) * | 2019-10-11 | 2020-06-05 | 中国航空工业集团公司西安飞机设计研究所 | Molded bearing opening cover of airplane |
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| Publication number | Publication date |
|---|---|
| CN112160804A (en) | 2021-01-01 |
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