阅读说明：本技术 一种腔道动密封结构 (Cavity channel dynamic sealing structure ) 是由 孙轶 丛明辉 彭小波 张玺 张峰 王玉 于 2021-01-08 设计创作，主要内容包括：本发明涉及密封装置技术领域,具体涉及一种腔道动密封结构,包括：第一弹性填充件；第一支撑件,为空心管状,管壁上成型有多个网格,包覆在所述第一弹性填充件的外周；第一耐磨件,包覆在所述第一支撑件的外周。本发明提供了一种径向跟随性较好,密封泄漏量小,满足使用需求的腔道动密封结构。(The invention relates to the technical field of sealing devices, in particular to a cavity channel dynamic sealing structure, which comprises: a first elastic filling member; the first supporting piece is in a hollow tubular shape, and a plurality of grids are formed on the tube wall and wrap the periphery of the first elastic filling piece; the first wear-resistant part is coated on the periphery of the first supporting part. The cavity dynamic seal structure provided by the invention has the advantages of good radial following performance and small seal leakage amount, and meets the use requirements.)

1. A cavity dynamic seal structure is characterized by comprising:

a first elastic filler (6);

the first supporting piece (7) is in a hollow tubular shape, and a plurality of grids (9) are formed on the tube wall and wrap the periphery of the first elastic filling piece (6);

the first wear-resistant part (8) is coated on the periphery of the first supporting part (7).

2. The channelling sealing structure according to claim 1, characterized in that the grid (9) is formed by the crossing of a plurality of weft threads (10) distributed along the circumference of the first support (7) and a plurality of warp threads (11) distributed along an axis parallel to the first support (7).

3. The cavity channel dynamic seal structure according to claim 2, characterized in that the ends of two adjacent warps (11) are connected end to end, the ends of the other ends are separated, each warp (11) is wavy, and the wave crests of two adjacent warps (11) are opposite.

4. The channelling dynamic sealing structure according to claim 3, characterized in that the weft threads (10) are connected in sequence to the wave crests of the corresponding warp threads (11) in the same circumferential direction.

5. The channel dynamic seal structure according to any one of claims 1-4, wherein the first elastic filler (6) is ceramic fiber.

6. The channel dynamic seal structure according to any one of claims 1-5, characterized in that the first support member (7) is made by wire weaving, metal tube laser cutting or 3D printing.

7. The channel dynamic seal structure according to any one of claims 1-6, characterized in that the first wear resistant member (8) is woven from alumina fibers, aluminum silicate fibers or carbon fibers.

8. The channel dynamic seal structure according to any one of claims 1 to 7, further comprising a second elastic filler (12) provided between the first support member (7) and the first wear-resistant member (8), and a first adhesive layer (13) coated on the outer periphery of the second elastic filler (12).

9. The channel dynamic seal structure according to any one of claims 1 to 8, further comprising a second wear-resistant member (14) disposed between the first support member (7) and the first wear-resistant member (8), and a second adhesive layer (15) coated on the outer periphery of the second wear-resistant member (14).

10. The channel dynamic seal structure according to any one of claims 1 to 9, further comprising a second elastic filler (12) disposed between the first support member (7) and the first wear-resistant member (8), and a second support member (16) covering the outer periphery of the second elastic filler (12).

Technical Field

The invention relates to the technical field of sealing devices, in particular to a cavity dynamic sealing structure.

Background

For a new generation of fighter, on the premise of ensuring the aerodynamic performance of the jet pipe in the conventional state, the jet pipe realizes the function of large vector angle deflection so as to ensure that the jet pipe of the new generation of fighter is matched with the working state of the engine under the working conditions of subsonic, transonic and ultrasonic, and meet the wide-range working requirements of the engine. The dynamic seal is a key technology for ensuring the working reliability and the aerodynamics of the vectoring nozzle for the fighter. On one hand, a vector spray pipe for a new generation of fighter is generally arranged behind an engine afterburner, and the structural integrity of the spray pipe is ensured in a hot gas environment, so that a fire disaster caused by high-temperature gas leakage is avoided; on the other hand, the thrust loss caused by the air leakage of the spray pipe can be reduced due to good sealing performance. The sealing system of the spray pipe overcomes the thermal load of the temperature to the sealing element in the high-temperature environment, ensures the minimum clearance between the rotating part and the fixing part, reduces the friction between the rotating part and the fixing part, avoids the increase of the driving moment required by the moving part, and simultaneously ensures good sealing performance. Research shows that the sealing leakage amount is reduced by 1%, the engine thrust is increased by 1%, and the oil consumption is reduced by 0.1%; for the advanced fighter engine, under the condition that the rotating speed of the engine and the inlet temperature of a turbine rotor are kept unchanged, the leakage amount of the high-pressure turbine seal is reduced by 1%, the thrust is increased by 0.8%, and the oil consumption is reduced by 0.5%. Therefore, it is necessary to provide a dynamic seal structure between the spherical vectoring nozzle and the stationary housing.

In the prior art, a graphite sealing component or a brush type sealing component is adopted to realize dynamic sealing, but the structure is complex, and the requirement of non-regular molded surface continuous cavity sealing without dead angles cannot be met. And an inner sealing component and an outer sealing component are adopted to meet the sealing requirement of the irregular-profile continuous cavity, but the structure is complex, the radial sealing following performance is poor, and the use requirement cannot be met.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defects that the sealing component of the irregular-profile continuous cavity in the prior art has poor radial following performance and cannot meet the use requirement, so that the cavity dynamic sealing structure which has better radial following performance and small sealing leakage and meets the use requirement is provided.

In order to solve the above technical problem, the present invention provides a dynamic seal structure for a cavity, comprising:

a first elastic filling member;

the first supporting piece is in a hollow tubular shape, and a plurality of grids are formed on the tube wall and wrap the periphery of the first elastic filling piece;

the first wear-resistant part is coated on the periphery of the first supporting part.

Optionally, the grid is formed by a plurality of weft threads distributed along the circumferential direction of the first support member and a plurality of warp threads distributed parallel to the axial direction of the first support member.

Optionally, the head and the tail of two adjacent warp one end meet, the head and the tail of the other end separate, and each warp all is wavy, two adjacent warp's crest sets up relatively.

Optionally, the weft threads are sequentially connected with the wave crests of the warp threads in the same circumferential direction.

Optionally, the first resilient filler is ceramic fiber.

Optionally, the first supporting member is made by metal wire weaving, metal tube laser cutting or 3D printing.

Optionally, the first wear resistant member is woven from alumina fibers, aluminum silicate fibers or carbon fibers.

Optionally, the wear-resistant part further comprises a second elastic filling part arranged between the first supporting part and the first wear-resistant part, and a first adhesive layer coated on the periphery of the second elastic filling part.

Optionally, the wear-resistant part comprises a second wear-resistant part arranged between the first support part and the first wear-resistant part, and a second adhesive layer coated on the periphery of the second wear-resistant part.

Optionally, the wear-resistant part further comprises a second elastic filling part arranged between the first supporting part and the first wear-resistant part, and a second supporting part wrapping the periphery of the second elastic filling part.

The technical scheme of the invention has the following advantages:

1. the cavity dynamic sealing structure provided by the invention comprises a first elastic filling part, a first supporting part and a first wear-resistant part which are sequentially arranged from inside to outside, wherein the first supporting part is in a hollow tubular shape, and a plurality of grids are formed on the tube wall. The latticed first supporting piece is of a closed structure, and is uniform in stress and good in radial sealing following performance, so that the latticed first supporting piece is suitable for dynamic sealing of irregular cavities; the first wear-resistant part is tightly connected with the first supporting part through radial compression force and expansion force, so that the sealing leakage rate is reduced, the service life of the dynamic sealing structure is prolonged, and the reliability and the working characteristics of an engine are improved; and the structure is simple and reliable, the weight is light, the size is small, the processing is easy, and the assembly is simple.

2. According to the cavity dynamic seal structure provided by the invention, the first elastic filling piece is made of ceramic fiber, so that the cavity dynamic seal structure not only can play a role of auxiliary support, but also can block part of high-temperature gas from leaking.

3. According to the cavity dynamic seal structure provided by the invention, the first pasting layer and the second pasting layer have good rebound resilience and flexibility, and the sealing performance and the overall connectivity of the whole structure can be further improved.

4. According to the cavity dynamic sealing structure provided by the invention, the second wear-resistant part is arranged between the first supporting part and the first wear-resistant part, so that the dynamic sealing structure can be suitable for occasions with long-time reciprocating friction and poor moving surface roughness.

5. According to the cavity dynamic sealing structure provided by the invention, the second elastic filling piece is arranged between the first supporting piece and the first wear-resistant piece, and the second supporting piece is coated on the periphery of the second elastic filling piece, so that the dynamic sealing structure is suitable for occasions with ultrahigh temperature and large deformation of a sealing profile and has good rebound property.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic view of a lumen dynamic seal structure provided in a first embodiment of the present invention;

FIG. 2 is a schematic perspective view of FIG. 1;

FIG. 3 is an enlarged view of a portion of the first support;

FIG. 4 is a schematic view of a lumen dynamic seal structure provided in a second embodiment of the present invention;

FIG. 5 is a schematic view of a lumen dynamic seal structure provided in a third embodiment of the present invention;

FIG. 6 is a schematic view of a lumen dynamic seal structure provided in a fourth embodiment of the present invention;

FIG. 7 is a schematic view of a dynamic seal structure of a chamber provided by the present invention in a use state;

fig. 8 is a schematic view of a right-angled cavity to which the cavity dynamic sealing structure provided by the invention is applicable.

Description of reference numerals:

1. a spherical shell; 2. a stationary housing; 3. a baffle plate; 4. sealing the cavity; 5. a dynamic sealing structure; 6. a first elastic filling member; 7. a first support member; 8. a first wear part; 9. a grid; 10. a weft; 11. warp threads; 12. a second elastic filling member; 13. a first adhesive layer; 14. a second wear part; 15. a second adhesive layer; 16. a second support member; 17. a right-angled lumen.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

The dynamic sealing structure is mainly applied to the occasions of high-temperature dynamic sealing in the fields of aviation, aerospace, ships, nuclear industry, petrochemical industry, general machinery and the like, is suitable for irregular sealing cavities, and particularly relates to the dynamic sealing structure for aero-engines, aeroderivative gas turbines, aircrafts and the like.

As shown in fig. 1, 2, 3 and 7, in the first embodiment of the cavity dynamic seal structure, the dynamic seal structure 5 is arranged in a seal cavity 4 formed by the spherical shell 1, the fixed shell 2 and the baffle 3, the spherical shell 1 swings back and forth (the swing angle is less than or equal to 20 °/s) in the working process, and the medium in the inner cavity of the spherical shell 1 is high-temperature and high-pressure (the temperature is less than or equal to 1000K, and the pressure is less than or equal to 1MPa) gas; the fixed shell 2 is fixedly connected with the baffle 3 and is static during working; the spherical shell 1, the fixed shell 2 and the baffle 3 are in radial clearance fit to form a sealed cavity 4, the dynamic sealing structure 5 is arranged in the sealed cavity 4, is relatively fixed with the fixed shell 2 and the baffle 3, and is in elastic contact with the spherical shell 1, the fixed shell 2 and the baffle 3. When the dynamic seal structure 5 works, the assembling compression amount can be selected to be 15-35% according to the working condition requirement. As shown in fig. 1, the dynamic seal structure 5 includes a first elastic filling member 6, a first supporting member 7 and a first wear-resistant member 8, which are sequentially arranged from inside to outside.

The first elastic filling member 6 is made of ceramic fiber, and the filling density reaches 0.5-5 g/cm³。

As shown in fig. 3, the first supporting member 7 is a hollow tube, and a plurality of isosceles trapezoid-like grids 9 are formed on the tube wall. The grid 9 is formed by a plurality of weft threads 10 distributed along the circumferential direction of the first support member 7 and a plurality of warp threads 11 distributed parallel to the axial direction of the first support member 7. The head and the tail of 11 one ends of two adjacent warp meet, and the head and the tail separation of the other end, and each warp 11 all is wavy, adjacent two the crest of warp 11 sets up relatively, just weft 10 connects gradually corresponding same circumference the crest of warp 11.

The first supporting part 7 is wrapped on the periphery of the first elastic filling part 6 and is manufactured by adopting single-strand or multi-strand metal wire weaving, metal tube laser cutting or 3D printing. The first support member 7 has a support stiffness selected according to the requirements of the operating characteristics, and a high-temperature alloy material such as GH141, Inconel718 and the like can be selected.

The first wear-resistant part 8 is coated on the periphery of the first supporting part 7 and is woven by high-temperature-resistant and wear-resistant materials such as alumina fibers, aluminum silicate fibers or carbon fibers.

As shown in fig. 4, in the second embodiment of the cavity sealing structure, a second elastic filling member 12 is further disposed between the first supporting member 7 and the first wear-resistant member 8, and the outer periphery of the second elastic filling member 12 is coated with a first adhesive layer 13. The technical state and material of the second elastic filling member 12 are consistent with those of the first elastic filling member 6, the first adhesive layer 13 is coated on the outer surface of the second elastic filling member 12 through soaking, spraying and other modes, and the first adhesive layer 13 is a high-temperature glue coating.

In the third embodiment of the cavity sealing structure shown in fig. 5, a second wear-resistant part 14 is further disposed between the first supporting part 7 and the first wear-resistant part 8, and a second adhesive layer 15 is coated on the outer periphery of the second wear-resistant part 14. The technical state and the material of the second wear-resistant part 14 are consistent with those of the first wear-resistant part 8, the second adhesive layer 15 is coated on the outer surface of the second wear-resistant part 14 through soaking, spraying and other modes, and the second adhesive layer 15 is also a high-temperature glue coating.

As shown in fig. 6, in the fourth embodiment of the cavity sealing structure, a second elastic filling member 12 is further disposed between the first supporting member 7 and the first wear-resistant member 8, and a second supporting member 16 is wrapped around the second elastic filling member 12. The state of the art and the material of the second elastic filling member 12 correspond to those of the first elastic filling member 6, and the second support member 16 corresponds to those of the first support member 7.

The dynamic sealing structure in the above embodiment can be applied not only to a regular profile sealing cavity channel but also to an irregular sealing cavity channel, such as a corner of a right-angle cavity channel 17 shown in fig. 8, or a position with a smaller curvature. The requirements for the inner and outer diameters of the right-angle cavity 17 at the corner are as follows:(wherein R1 represents the inner diameter side radius of the right-angled channel, R2 represents the outer diameter side radius of the right-angled channel,The outer diameter of the dynamic seal).

As an alternative embodiment, the grid 9 may be any one or a combination of polygons, such as a triangle, a diamond, a square, a pentagon, or a hexagon.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.