WO2015070413A1 - 陶瓷热屏蔽片及耐热结构 - Google Patents

陶瓷热屏蔽片及耐热结构 Download PDF

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WO2015070413A1
WO2015070413A1 PCT/CN2013/087120 CN2013087120W WO2015070413A1 WO 2015070413 A1 WO2015070413 A1 WO 2015070413A1 CN 2013087120 W CN2013087120 W CN 2013087120W WO 2015070413 A1 WO2015070413 A1 WO 2015070413A1
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heat shield
ceramic heat
ceramic
sheets
resistant structure
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PCT/CN2013/087120
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English (en)
French (fr)
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王志强
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深圳智慧能源技术有限公司
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Priority to PCT/CN2013/087120 priority Critical patent/WO2015070413A1/zh
Publication of WO2015070413A1 publication Critical patent/WO2015070413A1/zh

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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
    • F23R3/007—Continuous combustion chambers using liquid or gaseous fuel constructed mainly of ceramic components
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M5/00—Casings; Linings; Walls
    • F23M5/02—Casings; Linings; Walls characterised by the shape of the bricks or blocks used

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  • the present invention relates to a heat shield structure, and more particularly to a ceramic heat shield sheet and a heat resistant structure using the same.
  • the use of a heat shield structure on high temperature components enhances the heat resistance of high temperature components.
  • the combustion chamber of a gas turbine is a high temperature component. Due to the excellent heat resistance of ceramics, the manufacturer has made the ceramic into a sheet shape, and then bolted to the inner wall of the flame tube of the combustion chamber, trying to separate the high temperature in the flame tube from the wall surface of the flame tube.
  • Such ceramic sheets are generally square in shape and spliced to each other to completely cover the inner surface of the flame tube. Then, due to the characteristics of the ceramic, the edges or sharp corners of the square ceramic sheet are prone to breakage under the action of thermal shock. Moreover, the fixed position is prone to thermal stress concentration and is therefore prone to breakage. Therefore, the above proposal proposed by the manufacturer needs to be improved.
  • a ceramic heat shield sheet is proposed herein to improve at least one of the aforementioned problems.
  • a heat resistant structure is also proposed herein to improve at least one of the aforementioned problems.
  • the ceramic heat shield sheet proposed herein includes a fixing portion for fixing to a heated surface.
  • a plurality of said ceramic heat shield sheets are secured to said heated surface to cover said heated surface.
  • These ceramic heat shield sheets partially overlap each other, and the fixing portions of each of the ceramic heat shield sheets are covered by at least one adjacent ceramic heat shield sheet.
  • the edge of the ceramic heat shield sheet is curved.
  • the ceramic heat shield sheet has an elliptical shape.
  • the ceramic heat shield sheet has opposite surfaces that are joined at a smooth curved surface at the edges.
  • the fixing portion of the ceramic heat shield sheet includes a fixing hole or a snap portion.
  • the fixing portion is disposed at a position biased toward an edge of the ceramic heat shield sheet.
  • the heat resistant structure proposed herein includes a heated surface and a plurality of ceramic heat shield sheets overlying the heated surface. These ceramic heat shield sheets partially overlap each other.
  • Each of the ceramic heat shield sheets includes a fixing portion fixed to the heat receiving surface, and a fixing portion of each of the ceramic heat shield sheets is covered by at least one adjacent ceramic heat shield sheet.
  • the securing portion is secured to the heated surface with a bolt or snap structure.
  • each ceramic heat shield sheet includes a first end provided with the securing portion and a second end opposite the first end, the second end being exposed and being a free end.
  • each of the ceramic heat shield sheets is curved.
  • each of the ceramic heat shield sheets has opposite surfaces that are joined at a smooth curved surface at the edges.
  • the ceramic heat shield sheets each have an inner surface facing the heated surface and an outer surface opposite the inner surface, and a gap is formed between the inner surface of the ceramic heat shield sheet and the heated surface .
  • the heated surface is an inner surface of a flame tube of a combustion chamber of a gas turbine and has a through hole that is in fluid communication with the gap and the slit such that air may sequentially pass through the air hole, the gap, and the gap. Flows to the outer surfaces of these ceramic heat shield sheets.
  • the fixing portion of the ceramic heat shield sheet is covered by the adjacent heat shield sheet, and the ceramic heat shield sheet eliminates the sharp edge, and these measures can reduce the thermal shock of the ceramic heat shield sheet.
  • the ceramic heat shield sheet is exposed to a high temperature environment and is a free end which is free to expand under thermal shock, thereby avoiding breakage of the ceramic sheet due to expansion resistance.
  • these ceramic heat shield sheets partially overlap each other, resulting in a gap between the heat shield sheet and the heated surface, and a gap is also formed between the heat shield sheets. Therefore, air can be formed in the flame tube through the gaps and slits to form a gas film on the surface of the heat shield sheet, and the heat shield sheets are protected from high temperatures.
  • FIG. 1 is a perspective view of one embodiment of a ceramic heat shield sheet.
  • FIG. 2 is a side view of the ceramic heat shield sheet of FIG. 1.
  • Figure 3 is a schematic plan view of one embodiment of a heat resistant structure.
  • FIG. 4 is a partially enlarged schematic view showing another angle of the heat resistant structure of FIG. 3.
  • FIG. 1 is a perspective view of one embodiment of a ceramic heat shield sheet.
  • the ceramic heat shield sheet 10 includes a fixed portion 12 for attachment to the heated surface 22 (Fig. 4).
  • a plurality of ceramic heat shield sheets 10 are secured to the heated surface to cover the heated surface 22.
  • These ceramic heat shield sheets 10 partially overlap each other, and the fixing portion 12 of each of the ceramic heat shield sheets 10 is covered by at least one adjacent ceramic heat shield sheet 10.
  • the edge 14 of the ceramic heat shield sheet 10 is curved. More specifically, the ceramic heat shield sheet 10 has an elliptical shape. In other embodiments, the ceramic heat shield sheet 10 can also be other shapes having curved edges, such as a circle. As shown in Fig. 2, the ceramic heat shield sheet 10 has opposite surfaces 16 and 18, and the opposite surfaces 16 and 18 are joined at a smooth curved surface at the edge 14. Since the ceramic heat shield sheet 10 has a smooth curved surface at its edge 14, the chance of forming a thermal stress concentration at its edge is lowered, and thermal shock resistance is improved.
  • the fixed portion 12 of the ceramic heat shield sheet 10 includes a fixing hole 12.
  • the ceramic heat shield sheet 10 can be secured to the heated surface by bolts through the mounting holes 12.
  • the securing portion 12 can also take other forms, including, for example, a snap portion to snap connect to the heated surface.
  • the fixing portion 12 is not provided at the center of the ceramic heat shield sheet 10, but is disposed at a position biased toward the edge of the ceramic heat shield sheet 10.
  • the ceramic heat shield sheet 10 includes a first end 24 (or referred to as a fixed end) that is provided with a securing portion 12 and a second end 26 that is opposite the first end 24.
  • the securing portion 12 can be disposed at any other suitable location as long as the ceramic heat shield sheet 10 can be secured to the heated surface 22.
  • FIG. 3 is a plan view of one embodiment of a heat resistant structure.
  • the heat resistant structure 20 includes a heated surface 22 (see FIG. 4) and a plurality of ceramic heat shield sheets 10 overlying the heated surface 22. These ceramic heat shield sheets 10 partially overlap each other.
  • the ceramic heat shield sheet 10 in this embodiment is identical in construction to the ceramic heat shield sheet 10 in FIG.
  • each ceramic heat shield sheet 10 includes a fixed portion 12 that is secured to the heated surface 22, and the fixed portion 12 of each ceramic heat shield sheet 10 is covered by at least one adjacent ceramic heat shield sheet 10.
  • the edge 14 of the ceramic heat shield sheet 10 is curved.
  • Each of the ceramic heat shield sheets 10 has opposite surfaces 16 and 18, and the opposite surfaces 16 and 18 are joined at a smooth curved surface at the edges 14.
  • the first end 24 of one of the ceramic heat shield sheets 10a (the intermediate ceramic heat shield sheet 10 of FIG. 4) is surrounded by an adjacent ceramic heat shield sheet 10b (the right side ceramic heat shield sheet 10 of FIG. 4).
  • the second end 26 is covered while the second end 26 of the ceramic heat shield 10a (the left ceramic heat shield 10 of FIG. 4) covers another adjacent ceramic heat shield 10c (the left side ceramic heat shield of FIG. 4)
  • the first end 24 of the sheet 10 By such partial overlap, the first ends 24 of the ceramic heat shield sheets 10 are covered by adjacent ceramic heat shield sheets 10, and the second ends 26 of the ceramic heat shield sheets 10 are exposed and are a free end.
  • the covered fixing portion 12 can be protected from direct impact of a high temperature or high temperature flame (for example, a flame in a combustion chamber), and the exposed free end or the second end 26 can freely expand under thermal shock, thereby also avoiding The ceramic sheet is broken due to the expansion resistance.
  • a high temperature or high temperature flame for example, a flame in a combustion chamber
  • the securing portion 12 can be secured to the heated surface 22 using a bolt or snap-fit structure.
  • the securing portion 12 is secured to the heated surface 22 with bolts 28.
  • the two surfaces 16 and 18 of the ceramic heat shield sheet 10 are an inner surface 16 facing the heated surface 22 and an outer surface 18 opposite the inner surface 16, respectively.
  • the inner surface 16 of the ceramic heat shield sheet 10 forms an angle with the heated surface 22.
  • the adjacent ceramic heat shield sheets 10 also have slits 32 therebetween so that airflow can flow between adjacent ceramic heat shield sheets 10.
  • the heated surface 22 has through holes 34 therethrough.
  • the air holes 34 are in fluid communication with the gaps 30 and the slots 32 such that air can flow to the outer surface 18 of the ceramic heat shield sheet 10 via the air holes 34, the gaps 30 and the slits 32 in sequence.
  • the "outer surface” referred to herein is referenced to the heated surface 22, which is actually a heated surface.
  • the heated surface 22 is the inner surface of the flame tube of the combustion chamber of the gas turbine. Therefore, air can be formed into the flame tube through the air holes 34, the gaps 30 and the slits 32 of the flame tube to form a gas film on the surface 18 of the ceramic heat shield sheet 10, and the ceramic heat shield sheets 10 are further protected from high temperature.
  • FIG. 3 exemplarily shows an arrangement of the heat shield sheets 10.
  • These heat shield sheets 10 may have other arrangements as long as the fixing portions 12 of the heat shield sheets can be covered by the adjacent heat shield sheets 10.
  • the fixing portion of the ceramic heat shield sheet is covered by the adjacent heat shield sheet, and the ceramic heat shield sheet eliminates sharp corner edges, and these measures can reduce the heat of the ceramic heat shield sheet by heat. Breakage caused by impact.
  • the ceramic heat shield sheet is exposed to a high temperature environment and is a free end which is free to expand under thermal shock, thereby avoiding breakage of the ceramic sheet due to expansion resistance.
  • these ceramic heat shield sheets partially overlap each other, resulting in a gap between the heat shield sheet and the heated surface, and a gap is also formed between the heat shield sheets. Therefore, air can be formed in the flame tube through the gaps and slits to form a gas film on the surface of the heat shield sheet, and the heat shield sheets are protected from high temperatures.

Abstract

提供了一种陶瓷热屏蔽片及其耐热结构，所述陶瓷片包括用以固定至受热表面的固定部，所述耐热结构包括受热表面以及若干覆盖在所述受热表面上的陶瓷热屏蔽片，这些陶瓷热屏蔽片相互局部重叠，每个陶瓷热屏蔽片的固定部被至少一个相邻的陶瓷热屏蔽片覆盖。降低了陶瓷热屏蔽片由于热冲击以及膨胀受阻导致的陶瓷片断裂。另外，陶瓷热屏蔽片相互局部重叠，导致热屏蔽片与受热表面之间形成间隙，而热屏蔽片之间也形成缝隙，空气可以通过这些间隙和缝隙而在热屏蔽片的表面上形成气膜，对热屏蔽片进行高温保护。

Description

陶瓷热屏蔽片及耐热结构 技术领域
本发明涉及一种热屏蔽结构，特别是涉及一种陶瓷热屏蔽片及采用这种陶瓷热屏蔽片的耐热结构。
 背景技术
高温部件上采用热屏蔽结构可以增强高温部件的耐热性能。例如，燃气轮机的燃烧室即是一种高温部件。由于陶瓷的优异耐热性能，有业者将陶瓷做成片状，然后利用螺栓固定在燃烧室的火焰筒内壁，试图将火焰筒内的高温与火焰筒壁面隔开。这种陶瓷片一般呈正方形，相互拼接以完全覆盖火焰筒内表面。然后由于陶瓷的特性，正方形陶瓷片的边缘或尖角在热冲击的作用下容易出现断裂。而且固定位置容易出现热应力集中，因此也容易出现断裂。因此业者提出的上述方案有待改进。
技术问题
有鉴于此，本文提出一种陶瓷热屏蔽片以改善至少一种前述提出的问题。
本文还提出一种耐热结构以改善至少一种前述提出的问题。
 技术解决方案
本文提出的陶瓷热屏蔽片包括用以固定至受热表面的固定部。在使用时，若干所述陶瓷热屏蔽片固定至所述受热表面以覆盖所述受热表面。这些陶瓷热屏蔽片相互局部重叠，每个陶瓷热屏蔽片的固定部被至少一个相邻的陶瓷热屏蔽片覆盖。
在一个实施例中，所述陶瓷热屏蔽片的边缘呈弧形。例如，所述陶瓷热屏蔽片呈椭圆形。
在一个实施例中，所述陶瓷热屏蔽片具有相反的两表面，所述相反的两表面在所述边缘以光滑曲面连接。
在一个实施例中，所述陶瓷热屏蔽片的固定部包括固定孔或卡扣部。
在一个实施例中，所述固定部设置在偏向所述陶瓷热屏蔽片边缘的位置。
本文提出的耐热结构包括受热表面以及若干覆盖在所述受热表面上的陶瓷热屏蔽片。这些陶瓷热屏蔽片相互局部重叠。每个陶瓷热屏蔽片包括固定至所述受热表面的固定部，每个陶瓷热屏蔽片的固定部被至少一个相邻的陶瓷热屏蔽片覆盖。
在一个实施例中，所述固定部利用螺栓或者卡扣结构固定至所述受热表面。
在一个实施例中，每个陶瓷热屏蔽片包括设有所述固定部的第一端以及与所述第一端相反的第二端，所述第二端暴露在外而且是一个自由端。
在一个实施例中，每个陶瓷热屏蔽片的边缘呈弧形。
在一个实施例中，每个陶瓷热屏蔽片具有相反的两表面，所述相反的两表面在所述边缘以光滑曲面连接。
在一个实施例中，这些陶瓷热屏蔽片各自具有面对所述受热表面的内表面和与所述内表面相反的外表面，这些陶瓷热屏蔽片的内表面与所述受热表面之间具有间隙。
在一个实施例中，这些陶瓷热屏蔽片之间具有缝隙。
在一个实施例中，所述受热表面为燃气轮机的燃烧室的火焰筒内表面且具有贯穿的气孔，所述气孔与所述间隙和缝隙流体相通，使得空气可依次经由所述气孔、间隙和缝隙流至这些陶瓷热屏蔽片的外表面。
 有益效果
在上述陶瓷热屏蔽片及耐热结构中，陶瓷热屏蔽片的固定部被相邻的热屏蔽片覆盖，陶瓷热屏蔽片消除尖角边缘，这些措施都可以降低陶瓷热屏蔽片由热冲击导致的断裂。而且，陶瓷热屏蔽片暴露在高温环境中的是一个自由端，在热冲击下可自由膨胀，因此也避免了因膨胀受阻而导致的陶瓷片断裂。另外，这些陶瓷热屏蔽片相互局部重叠，导致热屏蔽片与受热表面之间形成间隙，而热屏蔽片之间也形成缝隙。因此，空气可以在通过这些间隙和缝隙通入火焰筒内而在热屏蔽片的表面上形成气膜，对这些热屏蔽片进行高温保护。
 附图说明
图1是陶瓷热屏蔽片的一个实施例的立体图。
图2是图1的陶瓷热屏蔽片的侧视图。
图3是耐热结构的一个实施例的平面示意图。
图4是图3的耐热结构的另一个角度的局部放大示意图。
 本发明的实施方式
在详细描述实施例之前，应该理解的是，本发明不限于本申请中下文或附图中所描述的详细结构或元件排布。本发明可为其它方式实现的实施例。而且，应当理解，本文所使用的措辞及术语仅仅用作描述用途，不应作限定性解释。本文所使用的“包括”、“包含”、“具有”等类似措辞意为包含其后所列出之事项、其等同物及其它附加事项。特别是，当描述“一个某元件”时，本发明并不限定该元件的数量为一个，也可以包括多个。
图1是陶瓷热屏蔽片的一个实施例的立体图。陶瓷热屏蔽片10包括用以固定至受热表面22（图4）的固定部12。也请参考图3和图4，在使用时，若干陶瓷热屏蔽片10固定至受热表面以覆盖受热表面22。这些陶瓷热屏蔽片10相互局部重叠，每个陶瓷热屏蔽片10的固定部12被至少一个相邻的陶瓷热屏蔽片10覆盖。
在所示的实施例中，陶瓷热屏蔽片10的边缘14呈弧形。更具体而言，陶瓷热屏蔽片10呈椭圆形。在其他实施例中，陶瓷热屏蔽片10也可以是其他具有弧形边缘的形状，例如圆形。如图2，陶瓷热屏蔽片10具有相反的两表面16和18，相反的两表面16和18在边缘14以光滑曲面连接。由于陶瓷热屏蔽片10在其边缘14具有光滑曲面，因此降低了在其边缘形成热应力集中的机会，提高了热冲击耐受度。
在所示的实施例中，陶瓷热屏蔽片10的固定部12包括固定孔12。也请参照图4，利用螺栓穿过固定孔12即可将陶瓷热屏蔽片10固定在受热表面上。在其他实施例中，固定部12也可以采用其他形式，例如包括卡扣部，从而以卡扣的方式连接至受热表面。
固定部12并不是设置陶瓷热屏蔽片10的中央，而是设置在偏向陶瓷热屏蔽片10边缘的位置。在这样的实施例中，陶瓷热屏蔽片10包括设有固定部12的第一端24（或称为固定端）以及与第一端24相反的第二端26。在其他实施例中，固定部12可以设置在任何其它适当的位置，只要能将陶瓷热屏蔽片10固定至受热表面22即可。
如图3，为耐热结构的一个实施例的平面图。耐热结构20包括受热表面22（见图4）以及若干覆盖在受热表面22上的陶瓷热屏蔽片10。这些陶瓷热屏蔽片10相互局部重叠。此实施例中的陶瓷热屏蔽片10与图1中的陶瓷热屏蔽片10构造相同。如前所述，每个陶瓷热屏蔽片10包括固定至受热表面22的固定部12，每个陶瓷热屏蔽片10的固定部12被至少一个相邻的陶瓷热屏蔽片10覆盖。陶瓷热屏蔽片10的边缘14呈弧形。每个陶瓷热屏蔽片10具有相反的两表面16和18，相反的两表面16和18在边缘14以光滑曲面连接。
结合图4，其中一个陶瓷热屏蔽片10a（图4的中间陶瓷热屏蔽片10）的第一端24被一个相邻的陶瓷热屏蔽片10b（图4的靠右边陶瓷热屏蔽片10）的第二端26覆盖，同时该陶瓷热屏蔽片10a（图4的靠左边陶瓷热屏蔽片10）的第二端26覆盖另一个相邻的陶瓷热屏蔽片10c（图4的左侧陶瓷热屏蔽片10）的第一端24。通过这种相互局部重叠，这些陶瓷热屏蔽片10的第一端24被相邻的陶瓷热屏蔽片10覆盖，而这些陶瓷热屏蔽片10的第二端26暴露在外而且是一个自由端。因此，被覆盖的固定部12可以免受高温或高温火焰（例如燃烧室中的火焰）的直接冲击，而暴露在外的自由端或第二端26在热冲击下可自由膨胀，因此也避免了因膨胀受阻而导致的陶瓷片断裂。
如前所述，固定部12可以利用螺栓或者卡扣结构固定至受热表面22。在所示的实施例中，固定部12是利用螺栓28固定至受热表面22的。
如图4所示，陶瓷热屏蔽片10的两个表面16和18分别是面对受热表面22的内表面16和与内表面16相反的外表面18。陶瓷热屏蔽片10的内表面16与受热表面22之间具有间隙30。在图4的具体实施例中，陶瓷热屏蔽片10的内表面16与受热表面22之间形成夹角。相邻陶瓷热屏蔽片10之间也具有缝隙32，因此气流可在相邻陶瓷热屏蔽片10之间流过。
受热表面22具有贯穿的气孔34。气孔34与间隙30和缝隙32流体相通，使得空气可依次经由气孔34、间隙30和缝隙32流至陶瓷热屏蔽片10的外表面18。在此所称的“外表面”是以受热表面22为参照的，实际上该外表面18是受热的表面。在一个实施例中，受热表面22为燃气轮机的燃烧室的火焰筒内表面。因此，空气可以通过火焰筒的气孔34、间隙30和缝隙32通入火焰筒内而在陶瓷热屏蔽片10的表面18上形成气膜，进一步对这些陶瓷热屏蔽片10进行高温保护。
应当指出的是，图3仅示范性地示出热屏蔽片10的一种排列方式。这些热屏蔽片10还可以具有其它排列方式，只要热屏蔽片的固定部12能够被相邻的热屏蔽片10覆盖即可。
总之，在上述陶瓷热屏蔽片及耐热结构中，陶瓷热屏蔽片的固定部被相邻的热屏蔽片覆盖，陶瓷热屏蔽片消除尖角边缘，这些措施都可以降低陶瓷热屏蔽片由热冲击导致的断裂。而且，陶瓷热屏蔽片暴露在高温环境中的是一个自由端，在热冲击下可自由膨胀，因此也避免了因膨胀受阻而导致的陶瓷片断裂。另外，这些陶瓷热屏蔽片相互局部重叠，导致热屏蔽片与受热表面之间形成间隙，而热屏蔽片之间也形成缝隙。因此，空气可以在通过这些间隙和缝隙通入火焰筒内而在热屏蔽片的表面上形成气膜，对这些热屏蔽片进行高温保护。
本文所描述的概念在不偏离其精神和特性的情况下可以实施成其它形式。所公开的具体实施例应被视为例示性而不是限制性的。因此，本发明的范围是由所附的权利要求，而不是根据之前的这些描述进行确定。在权利要求的字面意义及等同范围内的任何改变都应属于这些权利要求的范围。

Claims (15)

  1. 一种陶瓷热屏蔽片，包括用以固定至受热表面的固定部，在使用时，若干所述陶瓷热屏蔽片固定至所述受热表面以覆盖所述受热表面，其特征在于，这些陶瓷热屏蔽片相互局部重叠，每个陶瓷热屏蔽片的固定部被至少一个相邻的陶瓷热屏蔽片覆盖。。
  2. 如权利要求1所述的陶瓷热屏蔽片，其特征在于，所述陶瓷热屏蔽片的边缘呈弧形。
  3. 如权利要求2所述的陶瓷热屏蔽片，其特征在于，所述陶瓷热屏蔽片呈椭圆形。
  4. 如权利要求1所述的陶瓷热屏蔽片，其特征在于，所述陶瓷热屏蔽片具有相反的两表面，所述相反的两表面在所述边缘以光滑曲面连接。
  5. 如权利要求1所述的陶瓷热屏蔽片，其特征在于，所述陶瓷热屏蔽片的固定部包括固定孔或卡扣部。
  6. 如权利要求1所述的陶瓷热屏蔽片，其特征在于，所述固定部设置在偏向所述陶瓷热屏蔽片边缘的位置。
  7. 一种耐热结构，包括受热表面以及若干覆盖在所述受热表面上的陶瓷热屏蔽片，每个陶瓷热屏蔽片包括用以固定至受热表面的固定部，其特征在于，这些陶瓷热屏蔽片相互局部重叠，每个陶瓷热屏蔽片的固定部被至少一个相邻的陶瓷热屏蔽片覆盖。
  8. 如权利要求7所述的耐热结构，其特征在于，所述固定部利用螺栓或者卡扣结构固定至所述受热表面。
  9. 如权利要求8所述的耐热结构，其特征在于，每个陶瓷热屏蔽片包括设有所述固定部的第一端以及与所述第一端相反的第二端，所述第二端暴露在外而且是一个自由端。
  10. 如权利要求7所述的耐热结构，其特征在于，每个陶瓷热屏蔽片的边缘呈弧形。
  11. 如权利要求7所述的耐热结构，其特征在于，每个陶瓷热屏蔽片具有相反的两表面，所述相反的两表面在所述边缘以光滑曲面连接。
  12. 如权利要求7所述的耐热结构，其特征在于，这些陶瓷热屏蔽片各自具有面对所述受热表面的内表面和与所述内表面相反的外表面，这些陶瓷热屏蔽片的内表面与所述受热表面之间具有间隙。
  13. 如权利要求12所述的耐热结构，其特征在于，这些陶瓷热屏蔽片的内表面与所述受热表面之间形成一夹角。
  14. 如权利要求12所述的耐热结构，其特征在于，这些陶瓷热屏蔽片之间具有缝隙。
  15. 如权利要求14所述的耐热结构，其特征在于，所述受热表面为燃气轮机的燃烧室的火焰筒内表面且具有贯穿的气孔，所述气孔与所述间隙和缝隙流体相通，使得空气可依次经由所述气孔、间隙和缝隙流至这些陶瓷热屏蔽片的外表面。
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