阅读说明：本技术 喷管隔热层结构及安装方法 (Spray pipe heat insulation layer structure and installation method ) 是由 周公铜 李环 文清兰 周开福 张琪 邓洁 于 2021-08-16 设计创作，主要内容包括：本发明提供了一种喷管隔热层结构,包括围绕在喷管周围的隔热围层、分布于喷管外侧的多根扰流柱,所述扰流柱一端点焊在喷管上,所述隔热围层对应扰流柱设有开孔,开孔与扰流柱配合,隔热围层由外而内依次包括外金属蒙皮、纤维隔热板、内金属蒙皮,内金属蒙皮与喷管外壁之间有间隙,该间隙在各扰流柱之间形成多个冷却通道。本发明结构简单、冷却效率高、成本低,适于推广使用；通过冷却通道,引用发动机机舱内的空气对喷管外壁进行冷却,通过扰流柱的作用使空气形成湍流,提高冷却效果,在满足喷管隔热需求的基础上,实现了同步对喷管外壁进行降温,满足了飞机的隔热需求,且保护了喷管。(The invention provides a thermal insulation layer structure of a spray pipe, which comprises a thermal insulation surrounding layer surrounding the spray pipe and a plurality of turbulence columns distributed on the outer side of the spray pipe, wherein one end point of each turbulence column is welded on the spray pipe, the thermal insulation surrounding layer is provided with an opening corresponding to the turbulence column, the opening is matched with the turbulence column, the thermal insulation surrounding layer sequentially comprises an outer metal skin, a fiber thermal insulation plate and an inner metal skin from outside to inside, a gap is formed between the inner metal skin and the outer wall of the spray pipe, and a plurality of cooling channels are formed between the turbulence columns by the gap. The invention has simple structure, high cooling efficiency and low cost, and is suitable for popularization and use; through cooling channel, quote the air in the engine compartment and cool off the spray tube outer wall, make the air form the torrent through the effect of turbulent flow post, improve the cooling effect, on the basis that satisfies the thermal-insulated demand of spray tube, realized cooling down the spray tube outer wall in step, satisfied the thermal-insulated demand of aircraft, and protected the spray tube.)

1. The utility model provides a spray tube insulating layer structure which characterized in that: including around thermal-insulated envelope (4) around spray tube (5), distribute in many turbulent flow post (8) in the spray tube (5) outside, turbulent flow post (8) one end spot welding is on spray tube (5), thermal-insulated envelope (4) correspond turbulent flow post (8) and are equipped with the trompil, and trompil and turbulent flow post (8) cooperation are thermal-insulated envelope (4) by outer and interior outer metal covering (6), fibre heat insulating board (7), interior metal covering (9) of including in proper order, and it is gapped between interior metal covering (9) and spray tube (5) outer wall, this clearance forms a plurality of cooling channel (10) between each turbulent flow post (8).

2. The lance insulation package of claim 1, wherein: the outer metal skin (6), the inner metal skin (9) and the spoiler column (8) are all made of 0Cr18Ni 9.

3. The lance insulation package of claim 1, wherein: the turbulence columns (8) are arranged on the spray pipe (5) in a penetrating and mixing way.

4. The lance insulation package of claim 1, wherein: and a step surface structure is arranged at one end of the turbulence column (8) close to the spray pipe (5).

5. The lance insulation package of claim 1, wherein: thermal-insulated enclosed layer (4) are two lamella structures, are equipped with overlap edge (1) between two lamellas, and overlap edge (1) both sides are equipped with rivet (2) and fix, and thermal-insulated enclosed layer (4) both ends are equipped with locking clamp (3).

6. The lance insulation package of claim 5, wherein: the overlapping edges (1) are arranged above and below the spraying pipe (5) along the heading direction.

7. The lance insulation package of claim 5, wherein: and the rivet (2) is provided with a locking wire for locking.

8. The lance insulation package of claim 5, wherein: and an air leakage preventing partition plate is arranged at the gap of the lap joint edge (1).

9. The lance insulation package of claim 5, wherein: a plurality of n-shaped bow frames are distributed on the locking clamp (3), and two ends of each n-shaped bow frame are fixed on the heat insulation surrounding layer (4).

10. The method for installing a thermal insulation layer structure of a spray pipe according to any one of claims 1 to 9, wherein: comprises the following steps of (a) carrying out,

firstly, spot welding turbulence columns (8) on a spray pipe (5), inserting and mixing the turbulence columns (8) for arrangement, and then forming holes on a heat insulation surrounding layer (4) according to the distribution positions of the turbulence columns (8);

step two, sleeving the heat-insulating enclosing layer (4) with the two-flap structure on the outer wall of the spray pipe (5), inserting the flow disturbing columns (8) into the holes, and forming a plurality of cooling channels (10) among the metal inner skin on the inner side of the heat-insulating enclosing layer (4), the flow disturbing columns (8) and the spray pipe (5);

and step three, overlapping is adopted between the two heat-insulating surrounding layers (4), two sides of the overlapping edge (1) are fixed by rivets (2), the rivets (2) are locked by locking wires, and then two ends of the heat-insulating surrounding layers (4) are fixed by locking clamps (3).

Technical Field

The invention relates to the technical field of thermal protection of jet pipes of aero-engines, in particular to a jet pipe thermal insulation layer structure and an installation method thereof.

Background

In order to reduce the total weight of the aircraft, the outline structure of the aircraft engine is made of aluminum alloy materials, and the materials have the characteristics of light weight and good rigidity, but have poor temperature resistance, and the service temperature is generally below 200 ℃. The spray pipe belongs to a hot end part of an aeroengine, the maximum temperature of the outer wall of the spray pipe exceeds 400 ℃, the aluminum alloy material cannot bear the high thermal load, and heat insulation measures must be taken to prevent the loss of the strength and rigidity of the aluminum alloy structure under the high-temperature condition from influencing the working reliability of the airplane. Meanwhile, the exhaust device is used as an important infrared radiation source behind an aircraft, the temperature of the wall of the spray pipe is too high, the infrared radiation intensity of the rear body of the aircraft body is increased, and in order to reduce the infrared radiation intensity of high-temperature components of the exhaust device, heat insulation measures must be taken for the spray pipe to reduce the infrared radiation intensity.

At present, the existing spray pipe heat insulation measures are wrapped by low-heat-conductivity light heat insulation materials, the effect of reducing the wall temperature of the spray pipe can be achieved, but high temperature is suppressed on the outer surface of the spray pipe, so that the obvious temperature rise of the spray pipe caused by heat accumulation influences the long-term reliability of the spray pipe in use.

Disclosure of Invention

In order to solve the technical problem, the invention provides a spray pipe heat insulation layer structure and an installation method.

The invention is realized by the following technical scheme.

The invention provides a thermal insulation layer structure of a spray pipe, which comprises a thermal insulation surrounding layer surrounding the spray pipe and a plurality of turbulence columns distributed on the outer side of the spray pipe, wherein one end point of each turbulence column is welded on the spray pipe, the thermal insulation surrounding layer is provided with an opening corresponding to the turbulence column, the opening is matched with the turbulence column, the thermal insulation surrounding layer sequentially comprises an outer metal skin, a fiber thermal insulation plate and an inner metal skin from outside to inside, a gap is formed between the inner metal skin and the outer wall of the spray pipe, and a plurality of cooling channels are formed between the turbulence columns by the gap.

The outer metal skin, the inner metal skin and the spoiler column are all made of 0Cr18Ni 9.

The flow disturbing columns are arranged on the spray pipe in a penetrating and mixing way.

One end of the turbulence column close to the spray pipe is provided with a step surface structure.

Thermal-insulated surrounding layer is two lamella structures, is equipped with the overlap edge between two lamellas, and the overlap edge both sides are equipped with rivet fixation, and thermal-insulated surrounding layer both ends are equipped with the locking clamp.

The overlapping edges are arranged above and below the spraying pipe along the heading direction.

And the rivet is provided with a locking wire for locking.

And an air leakage preventing partition plate is arranged at the gap of the lap joint edge.

A plurality of n-shaped bow brackets are distributed on the locking hoop, and two ends of each n-shaped bow bracket are fixed on the heat insulation surrounding layer.

The edge of the heat insulation surrounding layer is of a metal edge covering structure.

The invention also provides an installation method of the spray pipe heat insulation layer structure, which comprises the following steps:

firstly, spot welding turbulence columns on a spray pipe, inserting and mixing the turbulence columns, and then forming holes in a heat insulation surrounding layer according to the distribution positions of the turbulence columns;

step two, sleeving the heat-insulating surrounding layer with the two-section structure on the outer wall of the spray pipe, inserting the turbulence column into the opening, and forming a plurality of cooling channels between the metal inner skin on the inner side of the heat-insulating surrounding layer and the turbulence column and the spray pipe;

and step three, overlapping the two heat-insulating surrounding layers, fixing two sides of the overlapping edge by using rivets, locking the rivets by using locking wires, and fixing two ends of the heat-insulating surrounding layers by using locking clamps.

The invention has the beneficial effects that:

the invention has simple structure, high cooling efficiency and low cost, and is suitable for popularization and use. Through set up cooling channel between thermal-insulated envelope and spray tube, quote the air in the engine compartment and cool off the spray tube outer wall, make the air form the torrent through the effect of turbulent flow post, improve the cooling effect, on the basis that satisfies the thermal-insulated demand of spray tube, realized cooling down the spray tube outer wall in step, satisfied the thermal-insulated demand of aircraft, and protected the spray tube.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is a schematic structural view of a turbulent flow column.

Fig. 3 is a schematic view of the mounting structure of the present invention.

In the figure: 1-overlapping edges; 2-riveting; 3, locking a clamp; 4-a heat-insulating surrounding layer; 5-spraying a pipe; 6-outer metal skin; 7-a fiber thermal insulation board; 8-a turbulence column; 9-inner metal skin; 10-a cooling channel; 11-step surface.

Detailed Description

The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.

As shown in FIGS. 1 to 3, the structure of the present invention is schematically illustrated:

the invention provides a thermal insulation layer structure of a spray pipe 5, which comprises a thermal insulation surrounding layer 4 surrounding the spray pipe 5 and a plurality of turbulence columns 8 distributed outside the spray pipe 5, wherein one end of each turbulence column 8 is spot-welded on the spray pipe 5, the thermal insulation surrounding layer 4 is provided with an opening corresponding to the turbulence column 8, the opening is matched with the turbulence column 8, the thermal insulation surrounding layer 4 sequentially comprises an outer metal skin 6, a fiber thermal insulation plate 7 and an inner metal skin 9 from outside to inside, a gap is formed between the inner metal skin 9 and the outer wall of the spray pipe 5, and a plurality of cooling channels 10 are formed between the turbulence columns 8 through the gap.

The invention has simple structure, high cooling efficiency and low cost, and is suitable for popularization and use. Through set up cooling channel 10 between thermal-insulated envelope 4 and spray tube 5, quote the air in the engine compartment and cool off 5 outer walls of spray tube, make the air form the torrent through the effect of turbulent flow post 8, improve the cooling effect, on the basis that satisfies 5 thermal-insulated demands of spray tube, realized cooling down 5 outer walls of spray tube in step, satisfied the thermal-insulated demand of aircraft, and protected spray tube 5. In addition, the air in the cooling channel 10 greatly increases the heat transfer resistance, and the flowing air takes away the heat, thereby remarkably improving the heat insulation effect.

The outer metal skin 6, the inner metal skin 9 and the spoiler column 8 are all made of 0Cr18Ni 9. The material is consistent, the corrosion resistance effect is good, and the electrochemical corrosion in a high-temperature environment is prevented.

The turbulence columns 8 are arranged on the spray pipe 5 in a penetrating and mixing way. The airflow disturbance is increased, so that the air takes away more heat.

And a step surface structure is arranged at one end of the flow disturbing column 8 close to the spray pipe 5. The heat insulation surrounding layer 4 is supported through the step surface structure, so that the flow disturbing columns 8 cannot penetrate through the heat insulation surrounding layer 4, the cooling channel 10 is guaranteed not to be blocked, meanwhile, heat is conducted out through the step surface, the air contact surface is increased, and the cooling effect is improved; the height of the cooling channel 10 can be controlled by changing the thickness of the step surface, and the manufacturing is convenient.

Thermal-insulated surrounding layer 4 is two lamella structures, is equipped with overlap edge 1 between two lamellas, and 1 both sides in overlap edge are equipped with rivet 2 fixed, and 4 both ends in thermal-insulated surrounding layer are equipped with locking clamp 3. Through the connection of the two sections, the heat-insulating surrounding layer 4 and the turbulence column 8 are convenient to match, and the strength is not deteriorated due to the fact that a large opening is not required to be formed; the stability of the heat insulation surrounding layer 4 is ensured through the locking clamp 3 and the rivet 2.

The overlapping edges 1 are arranged above and below the nozzle 5 along the direction of the nozzle.

And the rivet 2 is provided with a locking wire for locking. The stability of the insulating envelope 4 is ensured.

And an air leakage preventing partition plate is arranged at the gap of the lap joint edge 1. The hot air is prevented from flowing out to cause the temperature of the outer contour of the engine to rise.

A plurality of n-shaped bow brackets are distributed on the locking hoop 3, and two ends of each n-shaped bow bracket are fixed on the heat insulation surrounding layer 4. Prevent that locking clamp 3 from removing, improve stability.

The edge of the heat insulation surrounding layer 4 is of a metal edge covering structure. The strength is improved, and the heat dissipation effect is good.

The invention also provides an installation method of the thermal insulation layer structure of the spray pipe 5, which comprises the following steps:

firstly, spot welding turbulence columns 8 on a spray pipe 5, inserting and mixing the turbulence columns 8, and then forming holes on a heat insulation surrounding layer 4 according to the distribution positions of the turbulence columns 8;

step two, sleeving the heat-insulating surrounding layer 4 with a two-flap structure on the outer wall of the spray pipe 5, inserting the turbulence column 8 into the opening, and forming a plurality of cooling channels 10 between the metal inner skin on the inner side of the heat-insulating surrounding layer 4 and the turbulence column 8 as well as the spray pipe 5;

and step three, overlapping the two heat-insulating surrounding layers 4, fixing the two sides of the overlapping side 1 by using rivets 2, locking the rivets 2 by using locking wires, and fixing the two ends of the heat-insulating surrounding layers 4 by using locking clamps 3.