CN102501977A

CN102501977A - Engine fairing

Info

Publication number: CN102501977A
Application number: CN2011103403551A
Authority: CN
Inventors: 许平; 李敬宾; 张亚海; 马俊; 王玉璠
Original assignee: Harbin Aircraft Industry Group Co Ltd
Current assignee: Harbin Aircraft Industry Group Co Ltd
Priority date: 2011-11-01
Filing date: 2011-11-01
Publication date: 2012-06-20

Abstract

The invention belongs to the field of power devices of helicopters, and relates to a detachable engine fairing of a helicopter and heat-insulation plates of the detachable engine fairing. The heat-insulation plates are respectively mounted on the left side and the right side of the engine fairing, each heat-insulation plate consists of an inner skin, a heat-insulation material and an outer skin, the inner skins and the outer skins are made of stainless steel, and black natural-dry heat-resistant paint is coated on outer surfaces of the inner skins and the outer skins. The engine fairing and the heat-insulation plates have excellent fitting property and reliability, and realize an excellent heat-insulation effect, requirements on temperature of the fairing are met, long-term problems of bulging, layering, even scorching and the like of an existing engine fairing due to the fact that the engine fairing contacts with high-temperature areas for a long time are solved, the integral quality of the helicopter is greatly improved, attendance rate of the helicopter is guaranteed, simultaneously, time and expenditure for maintaining the helicopter in an external field and replacing the engine fairing are saved, and the engine fairing has a remarkable economic benefit.

Description

A kind of cowling

Technical field

The invention belongs to helicopter engine installation field, relate to a kind of detouchable helicopter engine fairing and heat spacer thereof.

Background technology

Along with the continuous development of air armament equipment technology, the increase of engine power demand, also increasingly high to resistance to elevated temperatures, reliability, the security requirement of fairing behind the detouchable driving engine.At present, external helicopter adopts following two kinds of measures to improve the resistance to elevated temperatures of cowling: a kind of is to start with from material, improves the resistance to elevated temperatures of material itself; Another kind is the heat spacer that adopts fire resistant resin to make, and isolates by the exhaust pipe of engine passing the heat of high temperature to fairing.

Because the basic investigation of China's composite structure is relatively weaker, the application development of composite material is comparatively slow, in conjunction with the practical development situation of present China technical field of composite materials, through analyzing in many ways, from material property, can't address this problem at present.For the heat spacer of fire resistant resin manufacturing, because the complexity that the technology that the particularity of material technology is brought is made makes manufacture level receive great restriction.For addressing this problem, also there is use to increase the high temperature resistant glued membrane of one deck at the high-temperature area of fairing, be coated with methods such as high-temperature heat-resistance lacquer at the fairing outside face, but heat insulation heat-resisting effect is all not ideal enough.

Summary of the invention

The object of the invention: a kind of cowling that heat spacer is installed is provided, and this heat spacer is in light weight, and structure is comparatively simple, and is easy to maintenance.The present invention can obviously improve the working environment of exhaust pipe of engine exit fairing, improves the safe reliability of fairing.

Technical scheme of the present invention is: a kind of cowling, the said cowling left and right sides is separately installed with heat spacer 1.

Said heat spacer is made up of inside panel 3, thermal insulation material 4, exterior skin 5, and inside panel 4 and exterior skin 5 all adopt corrosion-resistant steel to process, and the outside face of said inside panel 4 and exterior skin 5 all scribbles black air dry thermostat varnish.

The invention has the beneficial effects as follows: cowling of the present invention and heat spacer thereof have good stickiness and reliability, have good effect of heat insulation, satisfy the temperature requirement of fairing.Fairing is because long-term contact high-temperature area after the invention solves for many years driving engine; And cause play drum, layering even problem such as burned; Improved the complete machine quality of helicopter greatly; Guarantee the attendance rate, saved simultaneously that the outfield helicopter is safeguarded, the time and the funds of fairing behind the re-engining, have remarkable economic efficiency.

Description of drawings:

Fig. 1: the scheme drawing of the present invention's one preferred embodiments;

Fig. 2: the connection scheme drawing of the present invention's one preferred embodiments;

Fig. 3: the heat spacer inner structure scheme drawing of the present invention's one preferred embodiments;

Wherein, 1 heat spacer; 2 cowlings, 3 inside panels; 4 thermal insulation materials; 5 exterior skins.

The specific embodiment

Below in conjunction with accompanying drawing the present invention is explained further details, see also Fig. 1 to Fig. 3.

Like Fig. 1 and shown in Figure 2, a kind of cowling, the said cowling left and right sides is separately installed with heat spacer 1.The cowling heat spacer is the method for having a competition through fairing mould tire, adopts different in nature curved design moulding, can adapt to the labyrinth profile of cowling, realizes the good fit between heat spacer and the fairing.Be installed on the cowling through the mode that is spirally connected, be convenient to decompose, installation and daily maintenance inspection.

As shown in Figure 3, said heat spacer is made up of inside panel 3, thermal insulation material 4, exterior skin 5, and inside panel 4 and exterior skin 5 all adopt corrosion-resistant steel to process, and the outside face of said inside panel 4 and exterior skin 5 all scribbles black air dry thermostat varnish.Because inside panel 3 and exterior skin 5 all adopt the corrosion-resistant steel manufacturing, have both satisfied the high-temperature work environment requirement that it is positioned at exhaust pipe of engine exit, can avoid again since aqueous vapor etc. to its corrosion problem that causes; Outside face at inside panel 3 and exterior skin 5 all scribbles black air dry thermostat varnish, has both strengthened heat-resisting heat-insulating effect, improves the heat-insulating capability of heat spacer, makes the surface of heat spacer and the surface color of cowling reach unified again.

The present invention is from engineering practice; Actual condition of service in conjunction with the helicopter fairing; Receive the influence of driving engine high exhaust temperature, the fairing that causes to play drum, layering to the fairing in exhaust pipe of engine exit, when serious even burned problem occurs and the corresponding solution that provides.Through ground installation test and flight certification test to the driving engine that heat spacer has been installed after the structure adaptability and the effect of heat insulation of fairing verify that conclusion (of pressure testing) is following:

Ground installation test: heat spacer and fairing interface position are accurate, and profile is fitted good, and is easy for installation, reliable.

Flight certification test: use RTD to measure the temperature of the inside and outside measuring point of heat spacer.Under ground driving situation, 34.6 ℃ of interior measuring point equilibrium temperatures, 114.4 ℃ of outer measuring point equilibrium temperatures; 3m hovers under the situation, 36.5 ℃ of interior measuring point equilibrium temperatures, 75.8 ℃ of outer measuring point equilibrium temperatures; Put down and fly under the situation 19.6 ℃ of interior measuring point equilibrium temperatures, 43.7 ℃ of outer measuring point equilibrium temperatures.

This shows that cowling of the present invention and heat spacer thereof show good stickiness and reliability in the installation test of ground, under three kinds of state of flights of flight examination, show good effect of heat insulation, satisfy the temperature requirement of fairing, reliable in function.After heat spacer installation is used, solved for many years fairing behind the driving engine because long-term contact high-temperature area, and cause play drum, layering even problem such as burned.The helicopter that installs additional behind the heat spacer is in good condition, has improved the complete machine quality of helicopter greatly, guarantees the attendance rate, has saved simultaneously that the outfield helicopter is safeguarded, the time and the funds of fairing behind the re-engining, has remarkable economic efficiency.

Claims

1. a cowling is characterized in that, the said cowling left and right sides is separately installed with heat spacer [1].

2. described cowling of claim 1; It is characterized in that; Said heat spacer is made up of inside panel [3], thermal insulation material [4], exterior skin [5]; Inside panel [4] and exterior skin [5] all adopt corrosion-resistant steel to process, and the outside face of said inside panel [4] and exterior skin [5] all scribbles black air dry thermostat varnish.