阅读说明：本技术 一种用于二元矢量喷管收敛段的侧向组合运动密封结构 (Lateral combined movement sealing structure for convergence section of binary vector nozzle ) 是由 廖华琳 黄维娜 李晓明 杨亚雄 朱川 许光伟 于 2021-10-28 设计创作，主要内容包括：本发明提供了一种用于二元矢量喷管收敛段的侧向组合运动密封结构,设置在收敛段与侧壁之间,包括第一密封结构及第二密封结构,第一密封结构包括L型侧板挂钩、压紧板、第一芯棒,且L型侧板挂钩、压紧板、隔热层之间形成第一空腔；第二密封结构包括收敛段侧板、收敛段侧板支架、第二芯棒,且隔热层、收敛段侧板支架、压紧板的折弯边之间形成第二空腔。第一空腔和第二空腔内分别输入带压冷气,带压冷气经第一密封结构补偿收敛段的热膨胀位移,实现收敛段与侧壁之间的密封。带压冷气经第二密封结构对侧壁变形位移进行补偿,从而实现避免主流燃气、冷却气泄露,减少性能损失,确保冷却效果,保障使用安全。(The invention provides a lateral combined movement sealing structure for a convergence section of a binary vector nozzle, which is arranged between the convergence section and a side wall and comprises a first sealing structure and a second sealing structure, wherein the first sealing structure comprises an L-shaped side plate hook, a pressing plate and a first mandrel, and a first cavity is formed among the L-shaped side plate hook, the pressing plate and a heat insulation layer; the second sealing structure comprises a convergence section side plate, a convergence section side plate support and a second core rod, and a second cavity is formed among the bending edges of the heat insulation layer, the convergence section side plate support and the pressing plate. And pressurized cold air is respectively input into the first cavity and the second cavity, and the pressurized cold air compensates the thermal expansion displacement of the convergence section through the first sealing structure, so that the sealing between the convergence section and the side wall is realized. The pressurized cold air compensates for the deformation and displacement of the side wall through the second sealing structure, so that the leakage of main stream gas and cooling air is avoided, the performance loss is reduced, the cooling effect is ensured, and the use safety is guaranteed.)

1. A side-to-side compound motion seal arrangement for a convergent section of a binary vectoring nozzle, comprising: the lateral combined movement sealing structure is arranged between the convergence section and the side wall and comprises a first sealing structure used for compensating the thermal expansion displacement of the convergence section;

the first sealing structure comprises an L-shaped side plate hook and a pressing plate, the upper end of the L-shaped side plate hook is connected with the upper end of the pressing plate through a first mandrel, the L edge of the lower end of the L-shaped side plate hook is detachably fixed on the convergent section bearing frame, and the lower end of the pressing plate is in contact with a heat insulation layer below the convergent section bearing frame;

a first cavity is formed among the L-shaped side plate hook, the pressing plate and the heat insulation layer, pressurized cold air is input into the first cavity, the pressurized cold air enables the L-shaped side plate hook and the pressing plate to rotate around the first mandrel, and the angle between the L-shaped side plate hook and the pressing plate is increased to compensate thermal expansion displacement of a convergence section.

2. The lateral compound motion seal arrangement for a convergent section of a binary vector nozzle of claim 1, wherein: the outside welding of L type curb plate couple has the backup pad, the backup pad with L type curb plate couple forms triangle bearing structure.

3. The lateral compound motion seal arrangement for a convergent section of a binary vector nozzle of claim 1, wherein: the lower end of the pressing plate is bent towards the direction of the convergent section bearing frame to form a bent edge, the outer wall of the bent edge is in contact with the thermal insulation layer, and a second mandrel is arranged on the inner wall of the bent edge.

4. The lateral compound motion seal arrangement for a convergent section of a binary vector nozzle of claim 3, wherein: the lateral combined movement sealing structure further comprises a second sealing structure, and the second sealing structure is used for compensating deformation and displacement of the side wall;

the second sealing structure comprises a convergent section side plate, one side of the convergent section side plate is connected with a convergent section side plate support, the convergent section side plate support is positioned between the heat insulation layer and the side wall, the inner wall of the convergent section side plate is attached to the molded surface of the heat insulation layer, and the upper end of the convergent section side plate support is arranged on the second core rod;

a second cavity is formed among the thermal insulation layer, the convergent section side plate support and the bent edge, pressurized cold air is input into the second cavity, and when the side wall generates side wall deformation displacement, the convergent section side plate support rotates around the second core rod to drive the convergent section side plate to displace relative to the thermal insulation layer so as to compensate the side wall deformation displacement.

5. The lateral compound motion seal arrangement for a convergent section of a binary vector nozzle of claim 4, wherein: the length of the binding surface of the side plate of the convergence section and the heat insulation layer is larger than the deformation displacement of the side wall.

6. The lateral compound motion seal arrangement for a convergent section of a binary vector nozzle of claim 4, wherein: and a plurality of vent grooves are formed in the side plate of the convergence section along the length direction of the side plate of the convergence section.

7. The lateral compound motion seal arrangement for a convergent section of a binary vector nozzle of claim 4, wherein: the pressure of the pressurized cold air is greater than the pressure of the main flow gas.

8. The lateral compound motion seal arrangement for a convergent section of a binary vector nozzle of any of claims 1 to 7, wherein: the lateral combined movement sealing structure is made of high-temperature resistant materials.

Technical Field

The invention belongs to the field of aircraft engines, relates to a sealing structure design technology, and particularly relates to a lateral combined movement sealing structure for a convergence section of a binary vector nozzle.

Background

In an aircraft engine, the binary vector spray pipe has the advantages of vector deflection maneuvering performance of the axisymmetric vector spray pipe, good stealth performance, integrated design with a rear fuselage and the like, and can greatly improve the penetration and survival capability of a warplane. Most of flow channel components in the binary vector spray pipe are moving components, the flow channel components are directly contacted with gas to bear high pneumatic load and thermal load, the seal of high-temperature high-pressure main flow gas and high-pressure cooling gas in the motion process of the spray pipe is good or bad, the cooling effect and the performance of the whole machine are directly influenced, the leakage of the high-temperature gas can cause the over-temperature of the load bearing components and even ablation, and the service life and the safety of the whole machine and components can be seriously threatened.

Currently, the side seals of the converging section of the existing binary vectoring nozzle have the following problems in design: 1. the contact position between the convergence section and the side wall is tightly attached in a cold state, and the convergence section rotates around the hinge point and rubs on the fixed side wall; the thermal insulation layer of the convergence section has certain thermal expansion displacement when working in a thermal state, and if the thermal expansion displacement cannot be accommodated by the sealing structure, the problems of interference and clamping stagnation among the structures can be caused; 2. in the hot working process of spray tube, pneumatic load can make the lateral wall outwards warp, and if convergence section lateral seal structure does not possess the compensation function, then can make unable laminating between convergence section and the lateral wall, lead to mainstream gas to reveal, influence safe in utilization's problem.

Disclosure of Invention

In order to solve the problems of interference and clamping stagnation caused by thermal expansion displacement and main stream gas leakage caused by outward deformation of the side wall when a binary vector nozzle of an engine works in a hot state, the invention designs a lateral combined motion sealing structure for a convergent section of the binary vector nozzle, which can realize the sealing of the lateral main stream gas and cooling gas of the convergent section and the environment under the high-temperature and high-pressure environment, avoid the leakage of the main stream gas and the cooling gas, reduce the performance loss, ensure the cooling effect and ensure the use safety.

The technical scheme for realizing the purpose of the invention is as follows: a side compound motion seal structure for a convergent section of a binary vectoring nozzle, the side compound motion seal structure disposed between the convergent section and a sidewall, includes a first seal structure for compensating for thermal expansion displacement of the convergent section.

The first sealing structure comprises an L-shaped side plate hook and a pressing plate, the upper end of the L-shaped side plate hook is connected with the upper end of the pressing plate through a first mandrel, the L edge of the lower end of the L-shaped side plate hook is detachably fixed on a convergence section bearing frame, and the lower end of the pressing plate is in contact with a heat insulation layer below the convergence section bearing frame.

A first cavity is formed among the L-shaped side plate hook, the pressing plate and the heat insulation layer, pressurized cold air is input into the first cavity, and when the convergence section generates thermal expansion displacement, the pressurized cold air enables the L-shaped side plate hook and the pressing plate to rotate around the first mandrel, so that the angle between the L-shaped side plate hook and the pressing plate is increased to compensate the thermal expansion displacement of the convergence section, and sealing between the convergence section and the side wall is achieved.

Furthermore, a supporting plate is welded on the outer side of the L-shaped side plate hook, and the supporting plate and the L-shaped side plate hook form a triangular supporting structure.

Furthermore, the lower end of the pressing plate is bent towards the direction of the convergent section bearing frame to form a bent edge, the outer wall of the bent edge is in contact with the thermal insulation layer, and the inner wall of the bent edge is provided with a second core rod.

In one embodiment of the present invention, the above-mentioned lateral combined-motion sealing structure further includes a second sealing structure in addition to the first sealing structure, the second sealing structure being used for compensating the sidewall deformation displacement. The second sealing structure comprises a convergence section side plate, one side of the convergence section side plate is connected with a convergence section side plate support, the convergence section side plate support is located between the heat insulation layer and the side wall, the inner wall of the convergence section side plate is attached to the molded surface of the heat insulation layer, and the upper end of the convergence section side plate support is arranged on the second core rod.

A second cavity is formed among the thermal insulation layer, the convergence section side plate support and the bent edge, pressurized cold air is input into the second cavity, and when the side wall generates side wall deformation displacement, the convergence section side plate support rotates around the second core rod to drive the convergence section side plate to displace relative to the thermal insulation layer, so that the side wall deformation displacement is compensated, and sealing between the thermal insulation layer and the side wall is realized.

Furthermore, the length of the binding surface of the side plate of the convergent section and the heat insulation layer is larger than the deformation displacement of the side wall.

Furthermore, a plurality of vent grooves are formed in the side plate of the convergence section along the length direction of the side plate of the convergence section.

Further, the pressure of the pressurized cold air is greater than the pressure of the main flow gas. Furthermore, the pressure of the pressurized cold air is 1.2-1.3 times of the pressure of the main stream gas.

In one embodiment of the present invention, the lateral combined movement sealing structure is made of a high temperature resistant material.

Compared with the prior art, the invention has the beneficial effects that: the lateral combined movement sealing structure designed by the invention has the functions of containing thermal displacement of the heat insulation layer and compensating the pneumatic deformation of the side wall, can realize the sealing of lateral main flow gas and cooling gas at a convergence section with the environment in a high-temperature and high-pressure environment, avoids leakage of the main flow gas and the cooling gas, reduces performance loss, ensures the cooling effect and ensures the use safety.

Meanwhile, the lateral combined movement sealing structure can wrap and support heat insulation assemblies on two sides of the convergence section, can reduce the thermal deformation of local cantilever structures on two sides of the convergence section, further can improve the structural reliability, is independent of the convergence section, can push the convergence section in the lateral direction during assembly, is connected through a core rod, and is good in assembly manufacturability and maintainability.

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 perspective view of a lateral combination motion seal configuration in an embodiment;

FIG. 2 is a schematic cross-sectional view of a lateral combination motion seal configuration in accordance with an embodiment;

FIG. 3 is a schematic diagram of the operation of a lateral combination movement seal arrangement in an embodiment;

wherein, 1, an L-shaped side plate hook; 1-1, lower end L edge; 2. a compression plate; 2-1, bending the edge; 3. a first core rod; 4. a convergent section bearing frame; 5. a thermal insulation layer; 6. a convergence section; 7. a side wall; 8. a support plate; 9. a convergent section side plate; 10. a convergent section side plate bracket; 11. a second core rod; 12. a vent channel; 100. a first cavity; 200. a second cavity.

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 lateral combined motion sealing structure is arranged between the convergence section and the side wall and is used for compensating thermal expansion displacement of the convergence section and/or deformation displacement of the side wall under the high-temperature and high-pressure environment so as to realize sealing of lateral main flow gas and cooling gas of the convergence section and the environment, avoid leakage of the main flow gas and the cooling gas, reduce performance loss, ensure the cooling effect and ensure the use safety.

In one embodiment of the present embodiment, the lateral combined motion seal structure includes a first seal structure for compensating for thermal expansion displacement of the convergent section.

As shown in fig. 1 and 2, the first sealing structure comprises an L-shaped side plate hook 1 and a pressure plate 2, the upper end of the L-shaped side plate hook 1 is connected with the upper end of the pressure plate 2 through a first mandrel 3, the lower end L edge 1-1 of the L-shaped side plate hook 1 is detachably fixed on a convergent section bearing frame 4, and the lower end of the pressure plate 2 is in contact with a heat insulation layer 5 below the convergent section bearing frame.

Further, in order to stably realize the fixation between the L-shaped side plate hook 1 and the convergent section bearing frame 4, as shown in fig. 1 and 2, a support plate 8 is welded on the outer side of the L-shaped side plate hook 1, the support plate 8 and the L-shaped side plate hook 1 form a triangular support structure, and the L-shaped side plate hook 1 and the support plate 8 can also play a role in providing sealing pretension force.

Further, in order to ensure the sealing performance of the lower end of the compression plate 2 and the thermal insulation layer 5 at the lower part of the compression plate, the lower end of the compression plate 2 is bent towards the direction of the convergent section force bearing frame 4 to form a bent edge 2-1, the outer wall of the bent edge 2-1 is contacted with the thermal insulation layer 5, and the inner wall of the bent edge 2-1 is provided with a second core rod 8, namely the upper part of the compression plate 2 and the bent edge 2-1 at the lower part of the compression plate form an L-shaped compression plate.

Further, the pressure of the pressurized cold air is greater than the pressure of the main stream gas, and further the pressure of the pressurized cold air is 1.2-1.3 times of the pressure of the main stream gas.

Further, the first sealing structure is made of a high-temperature-resistant material, and specifically, the first sealing structure is made of a temperature-resistant alloy with the temperature of more than 950 ℃.

As shown in fig. 3, the first sealing structure compensates for the thermal expansion displacement of the convergent section, and the principle of sealing between the convergent section 6 and the sidewall 7 is as follows: a first cavity 100 is formed among the L-shaped side plate hook 1, the pressing plate 2 and the heat insulation layer 5, pressurized cold air is input into the first cavity 100, and when the convergence section 6 generates thermal expansion displacement, the pressurized cold air enables the L-shaped side plate hook 1 and the pressing plate 2 to rotate around the first mandrel 3, so that the angle between the L-shaped side plate hook 1 and the pressing plate 2 is increased to compensate the thermal expansion displacement of the convergence section 6, and sealing between the convergence section 6 and the side wall 7 is achieved.

In another embodiment of the present embodiment, the above-mentioned lateral combined-motion sealing structure further comprises a second sealing structure in addition to the first sealing structure, the second sealing structure being used for compensating the deformation displacement of the side wall 7.

As shown in fig. 1 and 2, the second sealing structure includes a converging section side plate 9, one side of the converging section side plate 9 is connected with a converging section side plate bracket 10, the converging section side plate bracket 10 is located between the heat insulation layer 5 and the side wall 7, the inner wall of the converging section side plate 9 is fitted with the profile of the heat insulation layer 5, and the upper end of the converging section side plate bracket 10 is arranged on the second core rod 11.

Furthermore, when the side wall 7 deforms and displaces, in order to avoid a gap between the side plate 9 of the convergence section and the heat insulation layer 5, the length of the joint surface between the side plate 9 of the convergence section and the heat insulation layer 5 is larger than the deformation and displacement of the side wall 7.

Furthermore, a plurality of ventilation grooves 12 are formed in the converging side plate 9 along the longitudinal direction of the converging side plate 9, and the ventilation grooves 12 can cool the side plate itself and discharge the cold air in the heat insulating layer 5 from the ventilation grooves 12.

Further, the pressure of the pressurized cold air is greater than the pressure of the main flow gas. Furthermore, the pressure of the pressurized cold air is 1.2-1.3 times of the pressure of the main stream gas.

As shown in fig. 3, the second sealing structure compensates for the deformation displacement of the side wall, and the principle of sealing between the thermal insulation layer 5 and the side wall 7 is as follows: a second cavity 200 is formed among the thermal insulation layer 5, the convergent section side plate support 10 and the bending edge 2-1 of the pressing plate 2, pressurized cold air is input into the second cavity 200, when the side wall 7 generates side wall deformation displacement, the convergent section side plate support 10 rotates around the second core rod 11 to drive the convergent section side plate 9 to displace relative to the thermal insulation layer 5, the side wall 7 deformation displacement is compensated, and sealing between the thermal insulation layer 5 and the side wall 7 is achieved.

Further, the second sealing structure is made of a high-temperature-resistant material, and specifically, the second sealing structure is made of a temperature-resistant alloy with the temperature of more than 950 ℃.

The lateral combined movement sealing structure designed by the specific embodiment has the functions of containing thermal displacement of the heat insulation layer 5 and compensating pneumatic deformation of the side wall 7, can realize sealing of lateral main flow gas and cooling gas of a convergence section and the environment in a high-temperature and high-pressure environment, avoids leakage of the main flow gas and the cooling gas, reduces performance loss, ensures a cooling effect, and ensures safe use.

Meanwhile, the lateral combined movement sealing structure can wrap and support heat insulation assemblies on two sides of the convergence section 6, can reduce the thermal deformation of local cantilever structures on two sides of the convergence section 6, further can improve the structural reliability, is independent of the convergence section 6, can push the convergence section 6 in the lateral direction during assembly, is connected through the first core rod 3 and the second core rod 11, and is good in assembly manufacturability and maintainability.

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.