CN114543120B - Flame tube fixing structure based on ceramic matrix composite - Google Patents
Flame tube fixing structure based on ceramic matrix composite Download PDFInfo
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- CN114543120B CN114543120B CN202111445124.7A CN202111445124A CN114543120B CN 114543120 B CN114543120 B CN 114543120B CN 202111445124 A CN202111445124 A CN 202111445124A CN 114543120 B CN114543120 B CN 114543120B
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- Prior art keywords
- flame tube
- pin
- ceramic matrix
- matrix composite
- ceramic
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
- F23R3/42—Continuous combustion chambers using liquid or gaseous fuel characterised by the arrangement or form of the flame tubes or combustion chambers
- F23R3/60—Support structures; Attaching or mounting means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
- F23R3/42—Continuous combustion chambers using liquid or gaseous fuel characterised by the arrangement or form of the flame tubes or combustion chambers
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gas Burners (AREA)
- Ceramic Products (AREA)
Abstract
The invention provides a flame tube fixing structure based on a ceramic matrix composite material, which comprises a combustion chamber machine gate, a fixing pin and a flame tube, wherein one end of the fixing pin is fixedly arranged on the combustion chamber machine gate, the other end of the fixing pin is provided with a buckle, the edge of the flame tube is provided with a groove matched with the buckle, and the fixing pin is clamped in the groove through the buckle and is connected with the flame tube. The flame tube fixing structure based on the ceramic matrix composite material can effectively avoid the problems that the ceramic matrix composite material is too complex in structure and difficult to form and process due to the fact that the cold and hot are not matched due to the difference of linear expansion coefficients, so that the ceramic matrix flame tube is simple in structural design and easy to process, and the manufacturing, forming and processing process difficulty of the ceramic matrix flame tube is reduced.
Description
Technical Field
The invention belongs to the technical field of aeroengines, and particularly relates to a flame cylinder fixing structure based on a ceramic matrix composite material.
Background
With the increasing innovation of aero-engine technology, the power-weight ratio of the aero-engine and the temperature rise of the combustion chamber are gradually improved, the requirements on the temperature resistance, the weight and the like of the hot end part of the combustion chamber are more and more strict, and the ceramic matrix composite has the advantages of high temperature resistance, oxidation resistance, light weight and the like, and is gradually applied to the hot end part of the engine in recent years, but due to the difference of linear expansion coefficients of the ceramic matrix composite and metal parts, the traditional structures such as connection, fixation, sealing and the like between the metal matrix parts cannot be fully applied. Therefore, the connection and fixation of the ceramic matrix composite material is one of the technical problems to be solved when the ceramic matrix composite material is applied to hot end components such as engine combustion chambers.
The current fixing modes of the ceramic matrix composite flame tube can be divided into two types, and one type of structure adopts the same fixing mode as the traditional metal matrix flame tube, namely, a fixing pin seat is arranged on the flame tube, and the fixing pin seat and the fixing pin are fixed with a combustion chamber casing. For example, in the connection method of the ceramic matrix composite in the prior art, the two composite materials are connected through the procedures of drilling, riveting, trimming, depositing and the like. The method can be used for installing the fixed pin seat similar to the metal flame tube structure on the ceramic-based flame tube so as to fix the flame tube and the combustion chamber casing. However, after the ceramic-based flame tube is formed, an additional fixing pin seat mounting and riveting process is needed. The other type is that the connecting part of the flame tube and the fixing pin is made of metal material, and the non-fixing end of the flame tube is made of ceramic matrix composite material. For example, in the fixing structure containing the ceramic matrix composite flame tube in the prior art, the flame tube head is still made of metal materials, the inner wall and the outer wall of the ceramic matrix flame tube are connected with the combustion chamber casing through fixing pins after being connected with the flame tube head made of metal materials, and the flame tube made of partial ceramic matrix composite materials can be fixedly connected with the combustion chamber casing made of metal materials.
The structural form of riveting the fixed pin can realize a structure similar to that of a flame tube made of metal materials, but the ceramic-based flame tube is complicated to form and process, and the process cost is increased. The adoption of the flame tube with the sectional splicing solves the problem of fixing the ceramic-based flame tube to a certain extent, but does not solve the problem of connection and fixation between the flame tube with all the materials of the ceramic-based composite material and the combustion chamber casing. In addition, the matched part of the conventional fixing pin and the flame tube fixing pin seat is of a spherical-face cylindrical surface or cylindrical-face cylindrical surface structure, the contact mode of the matched part is point contact or line contact, the stress of the contact part is large in the working process, and the hardness of the ceramic-based flame tube and the metal fixing pin material is different, so that the fixing pin made of the metal material is easier to wear.
Therefore, in the prior art, the problems that the ceramic composite flame tube and the metal piece are in a cold and hot state, and the ceramic matrix composite structure is too complex and difficult to form and process and the fixing pin is easy to wear due to the fact that the linear expansion coefficients are different and the cold and hot are not matched can not be solved.
Disclosure of Invention
Aiming at the problems, the invention provides the flame tube fixing structure based on the ceramic matrix composite material, which can effectively avoid the problems that the ceramic matrix composite material is too complex in structure and difficult to form and process due to the fact that the cold and hot are not matched due to the difference of linear expansion coefficients, so that the ceramic matrix flame tube is simple in structural design and easy to process, the manufacturing, forming and processing process difficulties of the ceramic matrix flame tube are reduced, and meanwhile, the abrasion of the matched part of the fixing pin and the flame tube is also reduced.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the utility model provides a flame tube fixed knot constructs based on ceramic matrix combined material, includes combustion chamber machine floodgate, fixed pin and flame tube, fixed pin one end is fixed in on the combustion chamber machine floodgate, the fixed pin other end is equipped with the buckle, the flame tube edge be equipped with the recess of buckle adaptation, the fixed pin passes through the buckle card is located in the recess with the flame tube is connected.
Preferably, the buckle comprises a first matching surface and a second matching surface which are arranged in parallel, and a matching rod is arranged between the first matching surface and the second matching surface.
Preferably, the edge of the flame tube is provided with a flange edge, the groove is arranged on the flange edge, and the width of the groove is matched with the diameter of the matching rod.
Preferably, the fixing pin comprises an upper section pin and a lower section pin, the upper section pin and the lower section pin are rotationally connected, the buckle is arranged on the lower section pin, and the upper section pin is connected with the combustor gate.
Preferably, the upper pin is provided with a rotary groove, and the upper end of the lower pin is positioned in the rotary groove.
Preferably, the combustion chamber machine gate is provided with a through hole, the upper section pin is inserted in the through hole, the top end of the upper section pin is provided with a limiting block, and the diameter of the limiting block is larger than that of the through hole.
Preferably, the flange is uniformly circumferentially arranged along the edge of the flame tube.
Preferably, the upper section pin is fixedly connected with the combustor gate through bolts.
Preferably, the groove is a U-shaped groove.
Preferably, the combustion chamber gate is a metal-based or/and non-metal-based combustion chamber gate.
The technical scheme of the invention has the following beneficial effects: on one hand, the invention can realize the fixation between the ceramic-based flame tube and the metal-based combustion chamber casing without arranging the flame tube fixing pin seat, so that the ceramic-based flame tube can freely expand in the radial direction and can be accurately positioned in the axial direction and the circumferential direction in a cold-hot state. The additional flame tube fixing pin seat is not needed, so that the structural design of the ceramic-based flame tube is simple, the ceramic-based flame tube is easy to process, and the manufacturing, forming and processing process difficulties of the ceramic-based flame tube are reduced; on the other hand, the matching structure of the fixing pin and the flame tube adopts surface matching in the axial direction, so that the stress area of the ceramic matrix composite flame tube at the fixing position is increased, the abrasion of the fixing pin at the matching position is reduced, and the problems that the fixing pin is easy to abrade due to the stress at the matching contact position of the fixing pin and the flame tube fixing pin seat and the difference of material hardness of the ceramic matrix flame tube and the metal fixing pin are reduced.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments or the description of 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 according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 shows a cross-sectional view of the fastening structure of the ceramic-based combustor basket and the combustion chamber casing of the present invention;
FIG. 2 shows a schematic diagram of the cooperation structure of the fixing pin and the flame tube of the invention;
fig. 3 shows a schematic structural view of the fixing pin of the present invention;
fig. 4 shows a structural cross-section of the fixing pin of the present invention;
FIG. 5 shows a schematic view of the circumferential positioning structure of the ceramic-based combustor basket of the present invention;
in the figure, 1, a combustion chamber casing; 2. a fixing pin; 3. a ceramic-based flame tube; 4. a flange edge; 5. a U-shaped groove; 6. a first mating surface; 7. a second mating surface; 8. a mating lever; 9. an upper pin; 10. and a lower pin.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
Example 1
The utility model provides a ceramic matrix flame tube fixed knot constructs based on ceramic matrix combined material, is shown as the fig. 1, includes combustor machine floodgate, fixed pin 2 and ceramic matrix flame tube 3, fixed pin 2 one end set firmly in on the combustor machine floodgate, the fixed pin 2 other end is equipped with the buckle, ceramic matrix flame tube 3 edge be equipped with the U type groove 5 of buckle adaptation, fixed pin 2 is located in the U type groove 5 through the buckle card and is connected with ceramic matrix flame tube 3, and the combustor machine floodgate is metal base or/and nonmetal base combustor machine floodgate, and the exemplary combustor machine floodgate selects metal base combustor machine floodgate.
Further, as shown in fig. 3, the buckle includes a first mating surface 6 and a second mating surface 7 that are disposed in parallel, a mating rod 8 is disposed between the first mating surface 6 and the second mating surface 7, a plurality of flange edges 4 are disposed on the edge of the ceramic-based flame tube 3, and, as shown in fig. 5, for example, 8 flange edges 4 are disposed, the flange edges 4 are disposed uniformly along the circumferential direction of the edge of the ceramic-based flame tube 3, the U-shaped groove 5 is disposed on the flange edges 4, and the width of the U-shaped groove 5 is adapted to the diameter of the mating rod 8, so that the flange edges 4 are tightly fitted with the first mating surface 6 and the second mating surface 7 in the clamping groove through the mating rod 8, as shown in fig. 2.
Fig. 1 is a sectional view of a fixing part of a ceramic-based flame tube 3 and a combustion chamber casing 1, wherein the ceramic-based flame tube 3 is matched with a fixing pin 2 connected with the combustion chamber casing 1 to realize axial and circumferential positioning of the ceramic-based flame tube 3. The fixing pin 2 is inserted into the U-shaped groove 5 of the flange edge 4 of the ceramic-based flame tube 3, the structure of the fixing pin 2 is shown in fig. 3, and the first matching surface 6 and the second matching surface 7 of the fixing pin 2 are matched with the flange edge 4 of the ceramic-based flame tube 3 through the surface to realize the axial positioning of the ceramic-based flame tube 3; the U-shaped groove 5 of the ceramic-based flame tube 3 is matched with the matching rod 8 of the fixing pins 2 to limit the circumferential displacement of the ceramic-based flame tube 3, and the circumferential accurate positioning of the ceramic-based flame tube 3 is realized by arranging different numbers of the fixing pins 2 (such as 4, 6, 8 and the like), and the circumferential positioning structure of the ceramic-based flame tube 3 is shown in figure 5. As shown in fig. 2, the fixing pin 2 can freely stretch and retract in the radial direction in the U-shaped groove 5 of the ceramic-based flame tube 3, so that the ceramic-based flame tube 3 and the metal casing can freely expand in the radial direction in a cold and hot state. When the ceramic-based flame tube 3 and the combustion chamber casing 1 are radially expanded due to heating, the ceramic-based flame tube 3 can be accurately positioned in the axial direction and the circumferential direction. As shown in fig. 2 and 3, the axial matching position of the fixing pin 2 and the ceramic-based flame tube 3 is in surface matching, so that the contact area of an axial stress surface is increased, the joint of the ceramic-based flame tube 3 and the fixing pin 2 can bear larger axial force, and meanwhile, compared with the point contact and the line contact of the traditional spherical and columnar fixing pin 2 structure under the same stress condition, the abrasion of the fixing pin 2 can be reduced, and the effect of two purposes can be achieved.
Further, as shown in fig. 4, the fixing pin 2 includes an upper pin 9 and a lower pin 10, the upper pin 9 and the lower pin 10 are rotatably connected, the buckle is arranged on the lower pin 10, the upper pin 9 is connected with the combustor gate, the upper pin 9 is provided with a rotating groove, and the upper end of the lower pin 10 is positioned in the rotating groove; the combustion chamber machine gate is provided with a through hole, the upper section pin 9 is inserted in the through hole, a limiting block is arranged at the top end of the upper section pin 9, the diameter of the limiting block is larger than that of the through hole, and the upper section pin 9 is fixedly connected with the combustion chamber machine gate through bolts.
The fixing pin 2 structure is composed of an upper section pin 9 of the fixing pin 2 and a lower section pin 10 of the fixing pin 2, wherein the lower section pin 10 of the fixing pin 2 can freely rotate in a rotating groove of the upper section pin 9 of the fixing pin 2. The upper section pin 9 of the fixed pin 2 is fixedly connected with the combustion chamber casing 1 through bolts, and the lower section 10 of the fixed pin 2 is matched with the ceramic-based flame tube 3. When the flange edge 4 of the ceramic-based flame tube 3 is slightly deflected due to stress in the use process, the lower section pin 10 of the fixed pin 2 can rotate along with the deflected flange edge 4 of the ceramic-based flame tube 3, and the upper section pin 9 of the fixed pin 2 fixed on the combustion chamber casing 1 still keeps the axial and circumferential positions unchanged, so that the risk of fracture of the flange edge 4 caused by deformation of the ceramic-based flame tube 3 due to stress in the use process is reduced. According to the ceramic-based flame tube fixing structure based on the ceramic-based composite material, on one hand, the ceramic-based flame tube 3 and the metal-based combustion chamber casing 1 can be freely expanded in the radial direction in a cold and hot state, the axial direction and the circumferential direction are accurately positioned, and an additional ceramic-based flame tube 3 fixing pin 2 nail seat is not needed, so that the ceramic-based flame tube 3 is simple in structure, and the difficulty of a processing technology is reduced; on the other hand, the fixing pin 2 and the ceramic-based flame tube 3 of the structure are matched in the axial direction by adopting surface matching, so that the stress area of the ceramic-based flame tube 3 of the ceramic-based composite material at the fixing position is increased, and the abrasion of the fixing pin 2 at the matching position is reduced.
In summary, the flame tube fixing structure based on the ceramic matrix composite material does not need an additional fixing pin seat, so that the ceramic matrix flame tube has simple structural design and easy processing, and the manufacturing, forming and processing process difficulties of the ceramic matrix flame tube are reduced; the contact surface of the flame tube and the fixing position of the fixing pin is in surface contact, and under the same stress condition, the connecting position can bear larger axial force compared with the traditional structure; the flame tube is in surface fit at the position with larger axial stress, and compared with the traditional fixing mode, the unit area of the fit position is small in stress, so that the abrasion of the flame tube fixing pin is reduced; the problems that the ceramic matrix composite is too complex in structure, difficult to form and process and the fixing pin is easy to wear due to the fact that the ceramic composite and the metal piece are not matched in cold and hot due to the fact that the linear expansion coefficients of the ceramic composite and the metal piece are different in cold and hot state are overcome.
Although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. The flame tube fixing structure based on the ceramic matrix composite is characterized by comprising a combustion chamber machine gate, a fixing pin and a flame tube, wherein one end of the fixing pin is fixedly arranged on the combustion chamber machine gate, the other end of the fixing pin is provided with a buckle, the edge of the flame tube is provided with a groove matched with the buckle, and the fixing pin is arranged in the groove through the buckle in a clamping manner and is connected with the flame tube; the fixing pin comprises an upper section pin and a lower section pin, the upper section pin and the lower section pin are rotationally connected, the buckle is arranged on the lower section pin, and the upper section pin is connected with the combustor machine brake.
2. The ceramic matrix composite based flame tube fixing structure of claim 1, wherein the buckle comprises a first mating surface and a second mating surface which are arranged in parallel, and a mating rod is arranged between the first mating surface and the second mating surface.
3. The ceramic matrix composite based flame tube fixing structure according to claim 2, wherein a flange edge is arranged on the edge of the flame tube, the groove is arranged on the flange edge, and the width of the groove is matched with the diameter of the matching rod.
4. The ceramic matrix composite based flame tube fixing structure of claim 1, wherein the upper pin is provided with a rotary groove, and the upper end of the lower pin is positioned in the rotary groove.
5. The flame tube fixing structure based on the ceramic matrix composite material according to claim 1, wherein a through hole is formed in the combustor gate, the upper-section pin is inserted into the through hole, a limiting block is arranged at the top end of the upper-section pin, and the diameter of the limiting block is larger than that of the through hole.
6. A ceramic matrix composite based burner tube securing structure as claimed in claim 3, wherein said flange is circumferentially and uniformly disposed along said burner tube rim.
7. The ceramic matrix composite based liner attachment structure of claim 4, wherein the upper pin is fixedly connected to the combustor basket brake by bolts.
8. The ceramic matrix composite based burner tube securing structure as claimed in any one of claims 1-7, wherein the recess is a U-shaped recess.
9. The ceramic matrix composite based liner attachment structure of claim 1, wherein the combustor basket is a metal-based or/and non-metal-based combustor basket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111445124.7A CN114543120B (en) | 2021-11-30 | 2021-11-30 | Flame tube fixing structure based on ceramic matrix composite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111445124.7A CN114543120B (en) | 2021-11-30 | 2021-11-30 | Flame tube fixing structure based on ceramic matrix composite |
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| Publication Number | Publication Date |
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| CN114543120A CN114543120A (en) | 2022-05-27 |
| CN114543120B true CN114543120B (en) | 2023-07-18 |
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| CN202111445124.7A Active CN114543120B (en) | 2021-11-30 | 2021-11-30 | Flame tube fixing structure based on ceramic matrix composite |
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| CN103486619A (en) * | 2012-06-13 | 2014-01-01 | 中国航空工业集团公司沈阳发动机设计研究所 | Flame tube fixing structure |
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| JP2789128B2 (en) * | 1990-06-01 | 1998-08-20 | ヤンマーディーゼル株式会社 | Ceramic gas turbine combustor |
| FR2825782A1 (en) * | 2001-06-06 | 2002-12-13 | Snecma Moteurs | Turbine with metal casing has composition combustion chamber fitted with sliding coupling to allow for differences in expansion coefficients |
| US7024863B2 (en) * | 2003-07-08 | 2006-04-11 | Pratt & Whitney Canada Corp. | Combustor attachment with rotational joint |
| US8713945B2 (en) * | 2010-06-29 | 2014-05-06 | Nuovo Pignone S.P.A. | Liner aft end support mechanisms and spring loaded liner stop mechanisms |
| US20130152591A1 (en) * | 2011-12-16 | 2013-06-20 | General Electric Company | System of integrating baffles for enhanced cooling of cmc liners |
| FR2996289B1 (en) * | 2012-10-01 | 2018-10-12 | Turbomeca | COMBUSTION CHAMBER COMPRISING A FIXED FLAME TUBE USING THREE CENTERING ELEMENTS. |
| US11149646B2 (en) * | 2015-09-02 | 2021-10-19 | General Electric Company | Piston ring assembly for a turbine engine |
| CN207907283U (en) * | 2017-12-26 | 2018-09-25 | 中国航发南方工业有限公司 | The connection structure of combustion box and burner inner liner |
| CN207944978U (en) * | 2018-03-07 | 2018-10-09 | 申郎 | A kind of coal mine underground air duct exit dust control device |
| CN212108499U (en) * | 2020-03-30 | 2020-12-08 | 浙江燃创透平机械股份有限公司 | Floating seal ring sleeve for thermal expansion compensation of combustion chamber of gas turbine |
| CN113587147B (en) * | 2021-07-28 | 2022-05-17 | 中国航发湖南动力机械研究所 | Ceramic base flame tube positioning structure |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1590850A (en) * | 2003-08-28 | 2005-03-09 | 诺沃皮尼奥内控股有限公司 | Fixing system of a flame pipe or liner |
| CN103486619A (en) * | 2012-06-13 | 2014-01-01 | 中国航空工业集团公司沈阳发动机设计研究所 | Flame tube fixing structure |
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