CN107524523B - Light-weight force-transmission support plate structure and casing with same - Google Patents
Light-weight force-transmission support plate structure and casing with same Download PDFInfo
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- CN107524523B CN107524523B CN201710706970.7A CN201710706970A CN107524523B CN 107524523 B CN107524523 B CN 107524523B CN 201710706970 A CN201710706970 A CN 201710706970A CN 107524523 B CN107524523 B CN 107524523B
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- support plate
- force transmission
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
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- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention relates to a light force transmission support plate structure which can be applied to a ground gas turbine and an aeroengine, wherein the force transmission support plate is formed by sheet metal forming of a plate with the plate thickness of 0.3-2 mm; the reinforced boss rib structures which have certain width and depth and are formed by punching are designed around the support plate at different height positions; the support plate is finally combined with the inner ring machine box and the outer ring machine box in a welding mode and bears complex stress of a welding assembly in a working state. The support plate formed by the sheet metal can obviously reduce the weight of the support plate casing in a ground gas turbine and an aeroengine. Further, from the analysis of the force transmission and stress angles of the engine, the structural design method of the reinforcing boss rib structure which is discretely arranged at different height positions on the surface of the support plate can meet the requirement of thermal expansion of the support plate caused by different deformation rates of the inner ring casing and the outer ring casing in a thermal state environment, and can adapt to the vibration risk of the thin-wall support plate possibly caused by the gas flow pulsation flowing at high speed in the main flow channel.
Description
Technical Field
The invention relates to a support plate structure used in the fields of gas turbines, aero-engines and the like, in particular to a light force transmission support plate structure which can meet the design requirements of (non) force transmission casings and (non) force transmission casings in mechanical structures.
Background
Due to the relation to the operation safety of the engine, the reliable design of the (non) force transmission casing and the (non) force transmission casing is a structural design problem which has important practical significance in the fields of gas turbines and aero-engines.
In the structural design of the prior gas turbine and aeroengine, the casing assembly is formed by combining and welding a plurality of parts which are formed by complex precision casting or forging. The (non) force transmission casing adopting the casing component has the advantages that the inner flow channel and the outer flow channel are connected by welding through a plurality of support plates distributed along the circumferential direction, the structure of the traditional force transmission support plate is shown in figure 1, and the traditional force transmission support plate has two characteristics: the first characteristic is that the method of casting or metal plate forming is generally adopted, and the method of combining and welding with the inner ring casing and the outer ring casing after machining can also be adopted; the second characteristic is that in order to increase the rigidity and the force transmission characteristic, the thickness is often thicker (more than 1.5mm) even if the sheet metal forming method is adopted, and the weight is heavier if the casting forming method is adopted. In order to improve the strength of the casing and ensure sufficient strength during the operation of the engine, the support plate is often designed to be thick, which inevitably causes the problems of heavy weight of the casing, complex machining process of parts and high machining cost. Meanwhile, the thickness of the wall surface of the support plate is too large, which brings great trouble to processing, so that the process routes of precision casting and forging can cause a great deal of loss of blanks, and a great deal of loss and waste of blank raw materials can be formed.
Aiming at the problems in the design and processing links of the traditional (non) force transmission casing, a casing component structure design strategy which is feasible in engineering and has better performance is urgently needed.
Disclosure of Invention
Aiming at the defects and shortcomings of the prior art, the invention aims to provide a light support plate structure with radial reinforcing ribs, wherein the light support plate structure is formed by a thin-wall metal plate, the root part rounding is considered, the surface of the support plate is processed by metal plate punching to form a reinforcing rib structure, and the selection of the design parameters of the support plate structure and the optimization and adjustment of the design parameters of the reinforcing rib structure on the surface of the support plate are preferably realized according to the temperature environment level of a main flow channel where the support plate is located, the temperature levels of inner and outer ring end wall casings of the support plate and the natural frequency characteristics of rotating blades at the upper and lower cross-. On the premise of ensuring the structural strength of the supporting plate, the lightweight of the supporting plate structure is realized, and the force transmission casing can be applied to the field of impeller machinery such as gas turbines and aero-engines as a force transmission casing structure design strategy.
The technical scheme adopted by the invention for solving the technical problem of the (non) force transmission casing is as follows:
a light force transmission support plate structure is arranged between an inner ring casing and an outer ring casing of an engine, is of a hollow thin-wall structure as a whole, is welded on the inner wall of the outer ring casing at the upper end and on the outer wall of the inner ring casing at the lower end, and is used for transmitting high-pressure rear fulcrum bearing radial load, and is in a root-part inverted structure at the welding part of the force transmission support plate and the inner and outer ring casings of the engine,
the force transmission support plate is formed by a thin-wall plate through sheet metal molding, and is provided with a blade profile molded line and a support plate blade shape required by the support plate, a plurality of reinforcing convex rib structures which protrude outwards and are arranged discretely are formed on the surface of the support plate along the height direction of the force transmission support plate through sheet metal stamping, and the extending direction of each reinforcing convex rib is at least basically consistent with the streamline direction of the surface of the support plate.
Preferably, the thickness of the force transmission supporting plate can be selected within the range of 0.3 mm-2 mm, but can be adjusted according to the actual design working condition.
Preferably, the plate material of the force transmission support plate can be formed naturally by sheet metal forming by selecting stainless steel or high-temperature alloy material with better mechanical property and good welding property.
Preferably, the force transmission support plate structure and the inner and outer ring end wall casing have end wall rounding structures not smaller than 2.5mm, and the rounding structures are naturally formed by a support plate metal plate forming process in consideration of processing manufacturability factors.
Preferably, the design parameters such as the number, the width and the direction of the reinforcing rib structures on the surface of the force transmission support plate structure are determined according to the thermal expansion requirements of the inner and outer ring end wall casings, the vibration characteristics of the support plate, the streamline direction of the main flow airflow and the like.
Preferably, the inner ring casing and the outer ring casing welded with the force transmission support plate structure are of a metal plate forming structure, and a welding process except brazing is adopted, so that the welding strength of a welding joint and the light weight of a welded assembly are guaranteed.
Preferably, the arrangement direction of the reinforced boss rib structure formed by stamping can be arranged in the direction consistent with or close to the surface streamline direction of the reinforced boss rib structure, so that the friction loss of the surface of the support plate caused by the rib structure is reduced to the maximum extent.
Preferably, along the circumferential direction, the force transmission support plate structure can be considered to be unevenly arranged so as to solve the problem of low-order self-excitation frequency coupling of the rotating blades caused by the uniform distribution of the support plates in the rotating blades positioned at the upstream and downstream of the support plates.
Preferably, the radial reinforcing boss rib structures on the sections of the force transmission support plate with different heights can be arranged with optimized boss width so as to adapt to the problems of the cooling mode of the inner and outer ring casings of different support plates and the thermal state free expansion of the support plates under the temperature deformation level under the working temperature environment of main flow channels of different support plates. The fatigue life of the welded assembly is improved.
Preferably, according to parameters such as height and width of the boss rib, a sheet metal stamping die design for multiple forming is adopted. Meanwhile, in order to ensure smooth switching of the boss rib and the surface of the support plate, the parameters of the boss rib need to be optimally designed.
Preferably, the height of the boss ribs on the surface of the light force transmission support plate structure is not less than 5mm, the number of the boss ribs is not less than 3, and the height and the number of the boss ribs can further optimize and adjust the vibration characteristic of the light support plate and optimize the force transmission characteristic of the light support plate.
According to another aspect of the invention, the casing with the light support plate structure is further provided.
Compared with the traditional support plate, the light force transmission support plate structure has the following advantages: (1) the light force transmission support plate and the surface convex rib structure of the light force transmission support plate are integrally designed, and the light force transmission support plate is easy to process. Has great prospect for engineering application; (2) the convex ribs are designed on the surface of the support plate, so that the structural strength of the support plate is improved, the wall thickness of the support plate can be greatly reduced, the weight of the casing assembly is obviously reduced, and the performance of an engine is improved; (3) from the analysis of the force transmission and stress angles of the engine, the structural design method of the reinforcing boss rib structure which is discretely arranged at different height positions on the surface of the support plate can meet the requirement of thermal expansion of the support plate caused by different deformation rates of the inner ring casing and the outer ring casing in a thermal state environment, and can adapt to the vibration risk of the thin-wall support plate possibly caused by the gas flow pulsation flowing at high speed of the main flow channel.
Drawings
Fig. 1 is a schematic view of a conventional force transmission plate design.
Fig. 2 is a schematic view of the structure of the lightweight plate of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples, which are illustrative of the present invention and are not to be construed as being limited thereto.
Figure 2 is a light weight force transfer plate structure of the present invention. The light force transmission support plate structure 100 is arranged between an inner ring casing 200 and an outer ring casing 300 of an engine, is integrally of a hollow thin-wall structure, and has the upper end welded on the inner wall of the outer ring casing 300 and the lower end welded on the outer wall of the inner ring casing 200. Fig. 2 shows that the lightweight force transmission support plate structure is applied to the transition section of high-pressure and low-pressure turbine stages of an aircraft engine and plays a role in transmitting radial load of a high-pressure rear supporting point bearing. The force transmission support plate 100 is formed by a thin-wall plate through sheet metal, is provided with a blade profile line and a support plate blade shape required by the support plate, and is provided with 3 boss rib structures 101 which are discretely arranged in the radial direction on the surface, wherein the boss rib structures 101 are punched by the sheet metal and protrude outwards from the surface of the support plate. The light force transmission support plate 100 is an independent part and is welded with the inner ring casing and the outer ring casing to form a complete force transmission path. The mode of metal plate can be adopted, and the mode of casting molding can also be adopted. But is not recommended to be formed by machining. Due to the adoption of the boss rib structure 101, the thickness of the force transmission support plate 100 can be selected within the range of 0.3 mm-2 mm and can be adjusted according to the actual design working condition, in the embodiment, due to the existence of the boss rib structure, the thickness of the force transmission support plate 100 is only 0.8mm (the support plate is made of high-temperature alloy materials), and the weight of parts is greatly reduced. The thrust-weight ratio index of the engine is improved.
The plate material of the force transmission support plate 100 can be formed naturally by sheet metal forming of stainless steel or high-temperature alloy material with better mechanical property and good welding property. The force transmission support plate structure 100 and the inner and outer ring end wall casings 200 and 300 are required to have end wall rounding structures not smaller than 2.5mm, and the rounding structures are required to be naturally formed by a support plate metal plate forming process in consideration of the processing manufacturability factors.
The design parameters such as the number, width and direction of the reinforcing rib structures 101 on the surface of the force transmission support plate 100 should be determined according to the thermal expansion requirements of the inner and outer ring end wall casings, the vibration characteristics of the support plate, the streamline direction of the main flow airflow and the like. The inner and outer ring casings 200, 300 welded to the force transmission plate structure 100 should preferably be formed by sheet metal, and a welding process other than brazing is adopted to ensure the welding strength of the weld joint and the light weight of the welded assembly.
The arrangement direction of the punch-formed reinforcing boss rib structure 101 can be the same as or close to the surface streamline direction, and the friction loss of the surface of the support plate caused by the rib structure is reduced to the maximum extent. Preferably, the force-transmitting support plate structure 100 may be arranged unevenly along the circumferential direction, so as to eliminate the problem of low-order self-oscillation frequency coupling of the rotor blades caused by the uniform distribution of the support plates at the upstream and downstream positions of the support plates. The radial reinforcing boss rib structures 101 on the sections of the force transmission support plate 100 with different heights can be arranged with the optimal boss width to adapt to the problem of thermal free expansion of the support plate under the cooling modes and temperature deformation levels of the inner and outer ring casings of different support plates in the working temperature environments of main flow channels of different support plates, and the fatigue life of a welded assembly is prolonged. According to the parameters of the height, the width and the like of the boss rib 101, the design of a sheet metal stamping die for multiple forming is adopted. Meanwhile, in order to ensure smooth switching of the boss rib and the surface of the support plate, the parameters of the boss rib need to be optimally designed. Preferably, the height of the boss ribs 101 on the surface of the light force transmission support plate structure 100 is not less than 5mm, and the number of the boss ribs 101 is not less than 3, and the height and the number of the boss ribs 101 can further optimize and adjust the vibration characteristics of the light force transmission support plate and optimize the force transmission characteristics of the light force transmission support plate.
It should be noted that, the design of the support plate structure and the rib structure on the surface thereof in different practical examples should comprehensively consider the use environment of the structure. The important points are the use temperature, the force transmission path, the force transmission level, the pulse characteristic of the main flow gas, the rotation frequency of the upper rotor and the lower rotor and other factors. These differences in environmental parameters will result in changes in the design parameters of the reinforcing rib structure and the brace structure. In an actual application example, detailed analysis is performed according to actual needs, and finally, all design parameters of the structure are confirmed.
In addition, it should be noted that the specific embodiments described in the present specification may differ in the shape of the components, the names of the components, and the like. All equivalent or simple changes of the structure, the characteristics and the principle of the invention which are described in the patent conception of the invention are included in the protection scope of the patent of the invention. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (8)
1. The utility model provides a be applied to ground gas turbine or aeroengine's light biography power extension board structure, pass the power extension board and set up between the inner ring casket and the outer loop casket of engine, pass the whole hollow thin-walled structure that is integrative of power extension board, its upper end welds on the inner wall of outer loop casket, and the lower extreme welds on the outer wall of inner ring casket for transmit the radial load of high pressure rear point bearing, pass the power extension board with inner ring casket and outer loop casket welding department form root radius structure, its characterized in that:
the force transmission support plate is formed by sheet metal processing of a thin-wall plate with the thickness of 0.3 mm-2 mm and has a blade profile line and a support plate blade shape required by the support plate,
stamping 3-8 reinforcing ribs which are 2-7 mm in width and protrude outwards on the surface of the support plate along the height direction of the force transmission support plate through a metal plate, wherein the extending direction of each reinforcing rib on the surface of the support plate is basically consistent with the streamline direction of the surface of the support plate, and each reinforcing rib is discretely arranged in the height direction of the force transmission support plate and has different widths;
the force transmission support plates are circumferentially arranged between the inner ring casing and the outer ring casing, and are distributed in a non-uniform distribution mode in the circumferential direction.
2. The lightweight force transmission plate structure of claim 1, wherein the root rounded structure between the force transmission plate and the inner and outer casings is formed naturally by sheet metal forming, and the force transmission plate has a weld in its circumferential direction in consideration of the need for forming, and the two ends of the force transmission plate are rounded to arrange one to two welds according to the processing route.
3. The lightweight force transmitting plate structure of claim 1 wherein the plate profiles of the force transmitting plate are of non-lifting blade profile configuration or lifting blade profile configuration with rectifying or diffusion expansion.
4. The lightweight force-transmitting plate structure of claim 1, wherein the design parameters of the reinforcing ribs are determined by the thickness of the plate material of the force-transmitting plate and the pulsation frequency factor of the high-velocity airflow on the surface of the plate, so as to ensure that the force-transmitting plate does not generate harmful vibration under the action of the main airflow in the channel.
5. A light force transmission support plate structure according to any one of claims 1 to 4, wherein the inner ring casing and the outer ring casing are formed by sheet metal forming, and the welding mode between the inner ring casing and the outer ring casing is selected according to the force transmission characteristic.
6. A lightweight force transmitting plate structure according to claim 1 wherein the radius of the root at each end of the force transmitting plate is not less than 2.5mm to reduce stress concentration problems caused by undersized fillet at the root of the plate.
7. A light force transmission support plate structure according to claim 1, characterized in that according to different usage environment temperature levels, the force transmission support plate is made of stainless steel or high temperature alloy material, which ensures better mechanical properties of the material, proper thermal expansion coefficient and reliable welding performance.
8. An engine casing, comprising an inner ring casing and an outer ring casing, wherein a plurality of force transmission support plates arranged along the circumferential direction are arranged between the inner ring casing and the outer ring casing, and the force transmission support plates are light-weight force transmission support plate structures according to any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710706970.7A CN107524523B (en) | 2017-08-17 | 2017-08-17 | Light-weight force-transmission support plate structure and casing with same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710706970.7A CN107524523B (en) | 2017-08-17 | 2017-08-17 | Light-weight force-transmission support plate structure and casing with same |
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| CN107524523A CN107524523A (en) | 2017-12-29 |
| CN107524523B true CN107524523B (en) | 2020-06-02 |
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| CN201710706970.7A Active CN107524523B (en) | 2017-08-17 | 2017-08-17 | Light-weight force-transmission support plate structure and casing with same |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109667669B (en) * | 2018-12-28 | 2020-08-25 | 中国科学院工程热物理研究所 | Gas turbine inlet casing |
| CN111852581A (en) * | 2020-07-24 | 2020-10-30 | 中国科学院工程热物理研究所 | Supporting plate structure suitable for main force bearing casing force transmission |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7544040B2 (en) * | 2004-05-27 | 2009-06-09 | Volvo Aero Corporation | Support structure in a turbine or compressor device and a method for assembling the structure |
| CN101776013A (en) * | 2009-01-07 | 2010-07-14 | 通用电气公司 | Method and apparatus to enhance transition duct cooling in a gas turbine engine |
| CN202202902U (en) * | 2011-06-30 | 2012-04-25 | 中航商用航空发动机有限责任公司 | Intermediate case for aeroengine |
| CN202707162U (en) * | 2012-06-11 | 2013-01-30 | 中国航空工业集团公司沈阳发动机设计研究所 | Support plate external fork tooth structure of gas turbine rear casing |
| CN104053859A (en) * | 2011-12-20 | 2014-09-17 | Gkn航空公司 | Method for manufacturing of a gas turbine engine component |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10450867B2 (en) * | 2016-02-12 | 2019-10-22 | General Electric Company | Riblets for a flowpath surface of a turbomachine |
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- 2017-08-17 CN CN201710706970.7A patent/CN107524523B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7544040B2 (en) * | 2004-05-27 | 2009-06-09 | Volvo Aero Corporation | Support structure in a turbine or compressor device and a method for assembling the structure |
| CN101776013A (en) * | 2009-01-07 | 2010-07-14 | 通用电气公司 | Method and apparatus to enhance transition duct cooling in a gas turbine engine |
| CN202202902U (en) * | 2011-06-30 | 2012-04-25 | 中航商用航空发动机有限责任公司 | Intermediate case for aeroengine |
| CN104053859A (en) * | 2011-12-20 | 2014-09-17 | Gkn航空公司 | Method for manufacturing of a gas turbine engine component |
| CN202707162U (en) * | 2012-06-11 | 2013-01-30 | 中国航空工业集团公司沈阳发动机设计研究所 | Support plate external fork tooth structure of gas turbine rear casing |
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| CN107524523A (en) | 2017-12-29 |
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