阅读说明：本技术 一种用于发动机二元喷管隔热屏的热补偿浮动结构 (Thermal compensation floating structure for engine binary spray pipe heat shield ) 是由 黄维娜 李晓明 郭建伟 廖华琳 朱川 谢龙 胡金龙 于 2021-10-26 设计创作，主要内容包括：本发明提供了一种用于发动机二元喷管隔热屏的热补偿浮动结构,包括第一浮动结构,第一浮动结构位于形状规则的隔热屏区域,将隔热屏与其上部的承力架连接。第一浮动结构包括固定在冲击板上表面的第一挂钩、固定在承力架下表面且与第一挂钩相对应的第二挂钩,第一挂钩与第二挂钩均套设在芯棒上,芯棒与承力架之间具有热补偿间隙H2。热补偿浮动结构的设计可满足隔热屏在垂直平面方向以及平行平面方向的热膨胀能够自由释放,也可有效解决边缘不规则区域因常规连接结构较难布置而导致的悬臂变形翘曲,进一步保证了喷管气动、冷却、隐身性能。(The invention provides a thermal compensation floating structure for a binary nozzle heat shield of an engine, which comprises a first floating structure, wherein the first floating structure is positioned in a heat shield area with a regular shape and connects the heat shield with a bearing frame on the upper part of the heat shield. The first floating structure comprises a first hook fixed on the upper surface of the impact plate and a second hook fixed on the lower surface of the bearing frame and corresponding to the first hook, the first hook and the second hook are sleeved on the core rod, and a thermal compensation gap H2 is formed between the core rod and the bearing frame. The design of the thermal compensation floating structure can meet the requirement that thermal expansion of the heat shield in the direction perpendicular to the plane and in the direction parallel to the plane can be freely released, the problem that the cantilever deforms and warps due to the fact that conventional connecting structures are difficult to arrange in edge irregular areas can be effectively solved, and the pneumatic, cooling and stealth performances of the spray pipe are further guaranteed.)

1. A thermally compensated floating structure for a binary nozzle heat shield for an engine, comprising: the heat shield floating structure is positioned in a heat shield area with a regular shape and connects the heat shield with a bearing frame on the upper part of the heat shield;

the first floating structure comprises a first hook fixed on the upper surface of the impact plate, and a second hook fixed on the lower surface of the bearing frame and corresponding to the first hook, the first hook and the second hook are sleeved on the core rod, and a thermal compensation gap H2 is formed between the core rod and the bearing frame.

2. The thermally compensated floating structure of claim 1, wherein: the thermal compensation gap H2 is 1-1.5 times of the thermal deformation displacement of the heat shield area with regular shape.

3. The thermally compensated floating structure of claim 1, wherein: the first hook and the second hook are arranged in a plurality, and the first hook and the second hook are arranged on the mandrel at intervals along the airflow direction of the binary engine nozzle.

4. The thermally compensated floating structure of claim 3, wherein: the first hook is fixed to the impact plate through a locking cap and a pin with a skirt.

5. The thermally compensated floating structure of any one of claims 1 to 4 wherein: the thermal compensation floating structure also comprises a second floating structure, the second floating structure is positioned in a heat shield area with an irregular shape and connects the heat shield with a bearing frame on the upper part of the heat shield;

the second floating structure comprises a Z-shaped support, an upper edge plate of the Z-shaped support is fixed on the lower surface of the bearing frame, and a lower edge plate of the Z-shaped support is arranged on the impact plate through a special-shaped nut and a pin with a skirt edge;

an upper baffle is arranged at the upper end of the special-shaped nut, and a radial gap H1 is formed between the upper baffle and the lower side plate of the Z-shaped support.

6. The thermally compensated floating structure of claim 5, wherein: the radial gap H1 is 1.2-2.0 times of the thermal deformation displacement of the heat shield area with irregular shape.

Technical Field

The invention belongs to the field of aircraft engines, relates to a binary spray pipe heat shield technology of an engine, and particularly relates to a thermal compensation floating structure for a binary spray pipe heat shield of the engine.

Background

In an aircraft engine, the binary vector spray pipe has the characteristics of vector deflection maneuvering performance of the axisymmetric vector spray pipe, good stealth performance, benefit for integrated design with a rear fuselage and the like, and can greatly improve the penetration and survival capability of a warplane.

The binary vector spray pipe relates to the multidisciplines such as pneumatics, cooling, sealing, motion, structural strength, and the structure is complicated, the spare part is many, and the majority is the part for the motion component. The flow channel of the element vector spray pipe is directly contacted with gas to bear high pneumatic load and thermal load, and the heat shield is arranged between the gas flow channel and the bearing component to avoid thermal influence of the thermal load on the bearing component. If the heat shield is subjected to thermal deformation or buckling deformation, the bearing component can bear higher thermal load, the bearing component is easy to generate overtemperature or even ablation, the service life of the whole machine and parts is seriously threatened, and the use safety is seriously threatened, so that the cooling effect and the whole machine performance in the movement process of the spray pipe are directly influenced.

At present, the reliability and stability of the heat shield are directly related to the connection structure between the heat shield and the bearing frame, and the design of the connection structure needs to meet the effective release of thermal expansion displacement of the heat shield in the vertical plane direction and the parallel plane direction and also needs to ensure that the irregular edge area of the heat shield does not generate buckling deformation during working. Therefore, how to design the connecting structure between the heat shield and the bearing frame to compensate the thermal deformation, the warping deformation and the like of the heat shield has important significance on the performance and the service life of the binary vector nozzle.

Disclosure of Invention

The invention aims to design a thermal compensation floating structure for a binary nozzle heat shield of an engine, which can effectively release thermal expansion displacement of the heat shield in the directions of a vertical plane and a parallel plane when the heat shield is subjected to thermal deformation or buckling deformation, and simultaneously avoid the buckling deformation of irregular edge areas of the heat shield during working.

The technical scheme for realizing the purpose of the invention is as follows: a thermal compensation floating structure for a binary nozzle heat shield of an engine comprises a first floating structure, wherein the first floating structure is positioned in a heat shield area with a regular shape and connects the heat shield with a bearing frame on the upper part of the heat shield. The first floating structure comprises a first hook fixed on the upper surface of the impact plate and a second hook fixed on the lower surface of the bearing frame and corresponding to the first hook, the first hook and the second hook are sleeved on the core rod, and a thermal compensation gap H2 is formed between the core rod and the bearing frame.

Further, the thermal compensation gap H2 is 1 to 1.5 times the thermal deformation displacement of the heat shield region with a regular shape.

Furthermore, the first hook and the second hook are arranged on the mandrel at intervals along the airflow direction of the binary engine nozzle.

Further, the first hook is fixed to the impact plate through a locking cap and a pin with a skirt.

In one embodiment of the present invention, the thermally compensated floating structure includes a second floating structure in addition to the first floating structure. The second floating structure is positioned in the heat shield area with irregular shape and connects the heat shield with the bearing frame on the upper part of the heat shield. The second floating structure comprises a Z-shaped support, an upper edge plate of the Z-shaped support is fixed on the lower surface of the bearing frame, and a lower edge plate of the Z-shaped support is arranged on the impact plate through a special-shaped nut and a pin with a skirt edge. An upper baffle is arranged at the upper end of the special-shaped nut, and a radial gap H1 is arranged between the upper baffle and the lower side plate of the Z-shaped bracket.

Further, the radial gap H1 is 1.2 to 2.0 times the thermal deformation displacement of the heat shield region having an irregular shape.

Compared with the prior art, the invention has the beneficial effects that: the design of the thermal compensation floating structure can meet the requirement that thermal expansion of the heat shield in the direction perpendicular to the plane and in the direction parallel to the plane can be freely released, the problem that the cantilever deforms and warps due to the fact that conventional connecting structures are difficult to arrange in edge irregular areas can be effectively solved, and the pneumatic, cooling and stealth performances of the spray pipe are further guaranteed.

Drawings

In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings used in the description of the embodiment will be briefly introduced below. It should be apparent that the drawings in the following description are only for illustrating the embodiments of the present invention or technical solutions in the prior art more clearly, and that other drawings can be obtained by those skilled in the art without any inventive work.

FIG. 1 is a schematic diagram of a first floating structure of a thermally compensated floating structure in an embodiment;

FIG. 2 is a schematic diagram of a second floating structure of a thermally compensated floating structure in an embodiment;

wherein, 1, the heat shield; 2. a bearing frame; 3. an impact plate; 4. a first hook; 5. a second hook; 6. a core rod; 7. a locking cap; 8. a pin with a skirt edge; a Z-shaped stent; 91. an upper edge plate; 92. a lower edge plate; 10. a special-shaped nut; 101. and an upper baffle plate.

Detailed Description

The invention will be further described with reference to specific embodiments, and the advantages and features of the invention will become apparent as the description proceeds. These examples are illustrative only and do not limit the scope of the present invention in any way. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention, and that such changes and modifications may be made without departing from the spirit and scope of the invention.

In the description of the present embodiments, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to a number of indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.

The present embodiment provides a thermal compensation floating structure for a binary nozzle heat shield of an engine, which can compensate thermal expansion displacement of the heat shield in a vertical plane direction and a parallel plane direction when the binary nozzle operates in a high-temperature and high-pressure environment.

In one embodiment of this embodiment, as shown in fig. 1, the thermally compensated floating structure comprises a first floating structure located in the regularly shaped heat shield area connecting the heat shield 1 to its upper outrigger 2.

As shown in fig. 1, the first floating structure includes a first hook 4 fixed on the upper surface of the impact plate 3, and a second hook 5 fixed on the lower surface of the force bearing frame 2 and corresponding to the first hook 4, the first hook 4 and the second hook 5 are both sleeved on the core rod 6, and a thermal compensation gap H2 is provided between the core rod 6 and the force bearing frame 2.

Because the position of bearing frame 2 is fixed unchangeable, when heat altered shape displacement takes place for heat shield 1, in order to ensure when heat shield 1 takes place warpage, impact plate 3 can not take place the extrusion when following heat shield 1 rebound and take place between 2 and push to cause impact plate 3 to be destroyed by the extrusion and lead to the problem that the cooling channel between impact plate 3 and heat shield 1 destroys and appear cold air leakage, this embodiment preferred selects above-mentioned thermal compensation clearance H2 to be 1~1.5 times of the heat altered shape displacement of the heat shield region of shape rule.

Because the lengths of the heat shield 1, the impact plate 3 and the force bearing frame 2 of the binary nozzle pipes with different structures can also be different, the first hook 4 and the second hook 5 are provided in plurality, and the first hook 4 and the second hook 5 are arranged on the mandrel 6 at intervals along the airflow direction of the binary nozzle pipe of the engine, so as to ensure that the whole binary nozzle pipe is in a stable state.

In order to ensure that the cold air passage between the heat shield 1 and the impact plate 3 does not change, the first hook 4 is fixed to the impact plate 3 via a locking cap 7 and a skirted pin 8.

In another embodiment of the present invention, the floating structure comprises a second floating structure in addition to the first floating structure, as shown in fig. 2, and the second floating structure is located in the irregularly-shaped heat shield region and connects the heat shield 1 with the upper force bearing frame 2.

As shown in fig. 2, the second floating structure comprises a Z-shaped bracket 9, an upper edge plate 91 of the Z-shaped bracket 9 is fixed on the lower surface of the carrier 2, and a lower edge plate 92 of the Z-shaped bracket 9 is arranged on the impact plate 3 through a special-shaped nut 10 and a skirt-equipped pin 8.

Wherein, the upper end of the special-shaped nut 10 is provided with an upper baffle 101, a radial gap H1 is arranged between the upper baffle 101 and the lower edge plate 92 of the Z-shaped bracket 9, and the upper baffle 101 and the radial gap H1 can compensate the thermal deformation displacement when the thermal deformation displacement of the heat shield 1 upwards generates buckling deformation, on one hand, the radial gap H1 can compensate the thermal deformation displacement, and on the other hand, the upper baffle 101 can prevent the lower edge plate 92 of the Z-shaped bracket 9 from falling out of the upper end of the pin 8 with the skirt.

When the heat shield 1 is subjected to thermal deformation displacement, in order to ensure that when the heat shield 1 is subjected to upward buckling deformation, the impact plate 3 does not extrude and break with the upper baffle plate 101 when moving upwards along with the heat shield 1, so that the impact plate 3 is broken by extrusion, and the cooling channel between the impact plate 3 and the heat shield 1 is broken, thereby causing cold air leakage, in the present embodiment, the radial gap H1 is preferably 1.2 to 2.0 times of the thermal deformation displacement of the heat shield region with irregular shape.

In another embodiment of the present invention, as shown in fig. 2, an expansion gap D1 is provided between the special-shaped nut 10 and the mounting hole of the Z-shaped bracket 9, and an expansion gap D2 is provided between the skirt-equipped pin 8 and the mounting hole of the impact plate 3, which can compensate for the lateral displacement of the heat shield 1 in the high-temperature and high-pressure environment. Specifically, the expansion gap D1 is greater than or equal to the thermal deformation difference between the heat shield 1 and the force bearing frame 2; the expansion gap D2 is greater than or equal to the difference in thermal deformation between the heat shield 1 and the strike plate 3.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.