A protection device for grinding of a cartridge and a protection method thereof

Abstract

The application discloses a protection device and a protection method thereof for a machine case grinding, and belongs to the technical field of part protection. The special-shaped protection adhesive tapes are obtained: the first and second special-shaped protection adhesive tapes are 1 / N circular rings, the ring width of the second special-shaped protection adhesive tape is larger than that of the first special-shaped protection adhesive tape; the third special-shaped protection adhesive tape is a quadrilateral structure, the top thereof is an outward convex arc line, the two sides thereof are inward concave arc lines, the bottom thereof is a straight line, and the distance between the two end points of the top edge is larger than that between the two end points of the bottom edge. N first special-shaped protection adhesive tapes are connected end to end and pasted on the inner wall surface of a combustion chamber outer sleeve and the rear end surface of a high-pressure turbine case, N second special-shaped protection adhesive tapes are connected end to end and pasted on the front end surface of the turbine case to the rear half of a machine case inner sleeve, and N third special-shaped protection adhesive tapes are connected end to end and pasted on the rear half of the machine case inner sleeve to the front end surface of the combustion chamber outer sleeve, so that the protection of a main combustion unit body machine case is completed.

Description

Technical Field

[0001] This invention belongs to the field of parts protection technology, specifically relating to a protective device and method for grinding machine casings. Background Technology

[0002] After the high-pressure turbine casing of a certain type of aero-engine is assembled onto the combustion chamber, the bore ΦB and outer ring runout of the high-pressure turbine casing need to be checked in the unit state. If the test data does not meet the design requirements, the high-pressure turbine casing needs to be re-machined in the main combustion unit state. During the re-machined high-pressure turbine casing, it is necessary to fully protect components such as the high-pressure turbine guide vanes, flame tube, and honeycomb sealing ring to prevent debris generated during the machining process from entering the cooling holes or honeycomb of the parts.

[0003] Currently, a whole roll (260mm×4000mm) of aviation-grade adhesive tape is commonly used to protect components such as high-conductivity blades and honeycomb sealing rings. This method requires cutting the tape individually each time, which increases the protection time and workload. In addition, the cutting accuracy is low, which may cause debris generated during the process to enter the cooling holes or honeycomb on the surface of the parts, resulting in serious consequences. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention aims to provide a protective device and method for casing grinding, and to solve the problem that existing aviation-grade adhesive tape cannot effectively protect the outer ring block of the high-pressure turbine casing.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] The first aspect of the present invention discloses a protective device for grinding a casing, comprising a first-specification irregular-shaped protective tape, a second-specification irregular-shaped protective tape, and a third-specification irregular-shaped protective tape, all used to protect a high-pressure turbine casing.

[0007] The first and second specifications of irregularly shaped protective tape are both 1 / N circular rings, with the ring width of the second specification being greater than that of the first specification. The third specification of irregularly shaped protective tape has a quadrilateral structure, with an outwardly convex arc at the top, inwardly concave arcs on both sides, and a straight bottom. The distance between the two ends of the top edge is greater than the distance between the two ends of the bottom edge. Wherein, N is a positive integer.

[0008] N first-specification irregular-shaped protective rubber sheets are connected end to end on one side of their ring width to protect the inner wall of the outer casing of the combustion chamber from the rear end of the high-pressure turbine casing. N second-specification irregular-shaped protective rubber sheets are connected end to end on one side of their ring width to protect the front end of the high-pressure turbine casing from the rear half of the casing inner casing. N third-specification irregular-shaped protective rubber sheets are connected end to end on their concave side to protect the rear half of the casing inner casing from the front end of the outer casing of the combustion chamber.

[0009] Preferably, the N first-specification irregular-shaped protective tapes connected end to end on one side of their ring width can form a truncated cone, wherein the generatrix of the truncated cone is greater than or equal to the length from the inner wall surface of the outer casing of the combustion chamber to the rear end face of the high-pressure turbine casing, the circumference of the top surface of the truncated cone is greater than or equal to the circumference of the inner wall surface of the outer casing of the combustion chamber, and the circumference of the bottom surface of the truncated cone is greater than or equal to the circumference of the rear end face of the high-pressure turbine casing.

[0010] Preferably, the N second-specification irregular-shaped protective tapes connected end to end on one side of their ring width can form a frustum, wherein the generatrix of the frustum is greater than or equal to the length from the front end face of the high-pressure turbine casing to the rear end face of the casing inner sleeve, the circumference of the top surface of the frustum is greater than or equal to the circumference of the front end face of the high-pressure turbine casing, and the circumference of the bottom surface of the frustum is greater than or equal to the circumference of the rear end face of the casing inner sleeve.

[0011] Preferably, the concave sides of N third-specification irregular-shaped protective tapes overlap and connect end to end to form an hourglass structure, wherein the hourglass structure is formed by connecting an inverted frustum and a right frustum.

[0012] More preferably, the circumference of the top surface of the inverted frustum is greater than or equal to the circumference of the rear end face of the inner casing, the circumference of the bottom surface of the inverted frustum is equal to the circumference of the top surface of the right frustum is greater than or equal to the circumference of the front end face of the inner casing, and the generatrix length of the inverted frustum is greater than or equal to the wall length from the front end to the rear end of the inner casing; the circumference of the bottom surface of the right frustum is greater than or equal to the circumference of the front end face of the front sealing ring, and the generatrix length of the right frustum is greater than or equal to the wall length from the front end to the rear end of the front sealing ring.

[0013] Preferably, when the concave sides of N third-specification irregular-shaped protective tapes overlap one after the other, the overlapping area of ​​two adjacent third-specification irregular-shaped protective tapes is 1 / 2 to 1 / 3 of the area of ​​the third-specification irregular-shaped protective tape.

[0014] Preferably, the thickness of the second type of irregularly shaped protective tape is greater than or equal to the gap between the high-pressure turbine casing and the guide.

[0015] Preferably, it also includes a gap-filling tool for use with a second type of irregularly shaped protective tape. The gap-filling tool includes a filling tongue, a connecting rod, and an elastic filling tongue connected in sequence. The elastic filling tongue includes a compacted upper section and a compacted lower section. One end of the compacted lower section is connected to the bottom of the connecting rod, and the other end is connected to the compacted upper section. There is an angle between the compacted lower section and the connecting rod, and there is elastic deformation between the compacted lower section and the compacted upper section.

[0016] Preferably, the tensile elongation of the first and third specifications of the irregularly shaped protective tape is 0, and the tensile elongation of the second specification of the irregularly shaped protective tape is 10% to 30%.

[0017] A second aspect of the present invention also discloses a method for protecting the main combustion unit casing using the aforementioned protective device for casing grinding. This method involves attaching N first-specification shaped protective sheets, one end of each ring width, to the inner wall of the outer casing of the combustion chamber and the rear end face of the high-pressure turbine casing; attaching N second-specification shaped protective sheets, one end of each ring width, to the front end face of the high-pressure turbine casing and the rear half of the inner casing; and attaching N third-specification shaped protective sheets, one end of each concave side, to the rear half of the inner casing and the front end face of the outer casing of the combustion chamber, thus completing the protection of the main combustion unit casing.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This invention provides a protective device for casing grinding. Based on the characteristics of each structure of the outer ring block of the high-pressure turbine casing to be protected, three different specifications of irregularly shaped protective tape are designed to ensure a tight fit between the tape and the outer ring block. In use, the three different specifications of the irregularly shaped protective tape are pasted onto the surface of the component to be protected, exposing the surface to be machined. This effectively prevents debris generated during machining from entering the cooling holes or honeycomb structures on the surface of the parts, thus providing effective protection for the internal parts of the main combustion unit during casing grinding. When using this protective device to protect the component, ① no cutting of the tape is required, and protection can be carried out immediately, saving time and effort with significant results; ② it can be reused multiple times; ③ after casing grinding, debris and dust on the surface of the protective tape are easy to clean and collect; ④ the three different specifications of irregularly shaped protective tape have a compact design, are easy to use, simple to maintain, and have low manufacturing costs.

[0020] Furthermore, the thickness of the second type of shaped protective tape is greater than or equal to the gap between the high-pressure turbine casing and the guide, which can ensure the filling protection; the tensile elongation rate of the second type of shaped protective tape is 10% to 30%, which can ensure that the second type of shaped protective tape can be inserted into the gap between the high-pressure turbine casing and the guide.

[0021] Furthermore, by using a gap-filling tool to apply a second type of irregularly shaped protective tape, the gap between the high-pressure turbine casing and the guide can be completely filled. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the parts of the high-pressure turbine casing structure that require protection.

[0023] Figure 2This is a schematic diagram of the first type of irregularly shaped protective tape in this invention;

[0024] Figure 3 This is a schematic diagram of the three-dimensional structure of the first type of irregularly shaped protective tape after being assembled in this invention.

[0025] Figure 4 This is a schematic diagram of the second type of irregularly shaped protective tape in this invention;

[0026] Figure 5 This is a schematic diagram of the three-dimensional structure of the second type of irregularly shaped protective tape after splicing in this invention.

[0027] Figure 6 This is a schematic diagram of the gap-filling tool of the present invention; wherein, A is the front view, B is the side view, and C is the rear view;

[0028] Figure 7 This is a schematic diagram of the third type of irregularly shaped protective tape in this invention;

[0029] Figure 8 This is a schematic diagram of the three-dimensional structure of the third type of irregularly shaped protective tape in this invention after being spliced ​​together.

[0030] Wherein: 1-Inner wall of the outer casing of the combustion chamber and rear end face of the high-pressure turbine casing; 2-From the front end face of the turbine casing to the rear half of the inner casing; 3-From the rear half of the inner casing to the front end face of the outer casing of the combustion chamber; 4-Stuffing tongue; 5-Connecting rod; 6-Elastic stuffing tongue. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0032] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0033] Unless otherwise specified, “N” is a positive integer in this article.

[0034] The present invention will now be described in further detail with reference to the accompanying drawings:

[0035] A protective device for grinding a casing includes three different sizes of shaped protective tape and a gap-filling tool. The main component of the shaped protective tape is fluorosilicone rubber. The three different sizes of shaped protective tape are respectively adhered to the inner wall surface of the outer casing of the combustion chamber and the rear end face 1 of the high-pressure turbine casing, the front end face of the turbine casing to the rear half of the inner casing 2, and the rear half of the inner casing to the front end face 3 of the outer casing of the combustion chamber. Figure 1 ) Surface. Among them, the three different specifications of irregularly shaped protective tape are the first specification, the second specification, and the third specification, with the following specific structures:

[0036] like Figure 2 As shown, the first type of irregularly shaped protective tape has a 1 / N ring structure. N rings of the first type of irregularly shaped protective tape, connected end-to-end on one side, can form a truncated cone. Figure 3 The generatrix of the frustum is greater than or equal to the length from the inner wall of the outer casing of the combustion chamber to the rear end face of the high-pressure turbine casing. The circumference of the top surface of the frustum is greater than or equal to the circumference of the inner wall of the outer casing of the combustion chamber. The circumference of the bottom surface of the frustum is greater than or equal to the circumference of the rear end face of the high-pressure turbine casing. In use, N pieces of the first specification irregular-shaped protective tape are connected end to end and pasted onto the inner wall of the outer casing of the combustion chamber and the rear end face 1 of the high-pressure turbine casing to protect the inner wall of the outer casing of the combustion chamber and the rear end face of the high-pressure turbine casing. Preferably, the top circumference of the frustum formed by the circumference of the N pieces of the first specification irregular-shaped protective tape is 823-877 mm, the bottom circumference is 713-767 mm, the outer diameter is 823-877 mm, and the generatrix is ​​46-87 mm.

[0037] like Figure 4As shown, the second type of irregularly shaped protective tape has a 1 / N ring structure. N rings of this second type of irregularly shaped protective tape, connected end-to-end on one side, can form a truncated cone. Figure 5 The generatrix of the truncated cone is greater than or equal to the length from the front face of the high-pressure turbine casing to the rear face of the inner sleeve of the casing. The circumference of the top surface of the truncated cone is greater than or equal to the circumference of the front face of the high-pressure turbine casing, and the circumference of the bottom surface of the truncated cone is greater than or equal to the circumference of the rear face of the inner sleeve of the casing. The tensile elongation of the second-specification irregular-shaped protective tape is 10% to 30%, and the thickness is greater than or equal to the gap between the casing and the guide. In use, N pieces of the second-specification irregular-shaped protective tape are connected end to end on one side of the annular width and pasted onto the surface of the section from the front face of the turbine casing to the rear half of the inner sleeve of the casing to protect the section from the front face of the turbine casing to the rear half of the inner sleeve of the casing. Preferably, the truncated cone formed by the annular width of N pieces of the second-specification irregular-shaped protective tape has a top surface circumference of 732 to 786 mm, a bottom surface circumference of 469 to 523 mm, and a generatrix of 121.2 to 193.2 mm.

[0038] like Figure 6 As shown, the gap-filling tool is used in conjunction with a second-sized irregularly shaped protective sheet to completely fill the gap between the housing and the guide. The gap-filling tool includes a filling tongue 4, a connecting rod 5, and an elastic filling tongue 6 connected in sequence. The filling tongue 4 is used to insert the second-sized irregularly shaped protective sheet into the gap between the housing and the guide. The elastic filling tongue 6 is used to compact and press the second-sized irregularly shaped protective sheet in the gap. The elastic filling tongue 6 includes a compaction upper section and a compaction lower section. One end of the compaction lower section is connected to the bottom of the connecting rod 5, and the other end is connected to the compaction upper section. There is an angle between the compaction lower section and the connecting rod 5, and there is elastic deformation between the compaction lower section and the compaction upper section. The elastic filling tongue 6 utilizes the elastic deformation between the compaction lower section and the compaction upper section to receive pressure in both the upper and lower directions in the middle of the gap, thus compacting and pressing the second-sized irregularly shaped protective sheet.

[0039] like Figure 7 As shown, the third type of irregularly shaped protective tape has a quadrilateral structure with a convex arc at the top, concave arcs on both sides, and a straight bottom. The distance between the two ends of the top edge is greater than the distance between the two ends of the bottom edge. N pieces of the third type of irregularly shaped protective tape with their concave sides overlapping end to end can form an hourglass structure. Figure 8The hourglass structure is formed by connecting an inverted frustum and a right frustum. The circumference of the top surface of the inverted frustum is greater than or equal to the circumference of the rear end face of the inner casing sleeve. The circumference of the bottom surface of the inverted frustum is equal to the circumference of the top surface of the right frustum, which is greater than or equal to the circumference of the front end face of the inner casing sleeve. The generatrix length of the inverted frustum is greater than or equal to the wall length from the front end to the rear end of the inner casing sleeve. The circumference of the bottom surface of the right frustum is greater than or equal to the circumference of the front end face of the front sealing ring. The generatrix length of the right frustum is greater than or equal to the wall length from the front end to the rear end of the front sealing ring. In use, N pieces of third-specification irregularly shaped protective tape are overlapped and connected end to end and pasted onto the rear half of the inner casing sleeve to the front end face 3 of the outer casing sleeve of the combustion chamber, to protect the rear half of the inner casing sleeve to the front end of the outer casing sleeve of the combustion chamber. Preferably, the top diameter of the inverted frustum is 469–523 mm, the bottom diameter is 313.8–367.8 mm, and the height is 219.3–273.3 mm; the top diameter of the right frustum is 313.8–367.8 mm, the bottom diameter is 408.8–462.8 mm, and the height is 77–131 mm.

[0040] It should be noted that when the concave sides of N third-specification irregular-shaped protective tapes overlap one after the other, the overlapping area of ​​two adjacent third-specification irregular-shaped protective tapes is 1 / 2 to 1 / 3 of the third-specification irregular-shaped protective tape.

[0041] The preparation methods for the above three different specifications of irregularly shaped protective adhesive tapes include the following steps:

[0042] ①Based on Figure 1 Based on the structural characteristics of different protective parts of the outer ring block of the high-pressure turbine casing shown, the design was obtained. Figure 3 , Figure 5 and Figure 8 Three-dimensional structure;

[0043] ② Given that the protected part of the main combustion unit is a plane with a large curvature, and considering the fit between the protective tape and the surface of the part, the planar diagram of each three-dimensional structure is unfolded and divided into N parts in proportion, so that the special protective tape can fit completely with the protected part.

[0044] ③ Cut the tape according to the design drawing.

[0045] The method for protecting the main combustion unit casing using the aforementioned protective device for casing grinding includes the following steps:

[0046] 1. Connect the loop widths of N first-specification irregular-shaped protective tapes end to end and stick them to the inner wall of the combustion chamber outer casing and the rear end face of the high-pressure turbine casing 1;

[0047] 2. In order to ensure that the protective tape can be completely filled into the gap between the casing and the guide, use a gap filling tool to stick N second-specification irregular-shaped protective tapes end to end on one side of the ring width to the front face of the turbine casing to the rear half of the inner sleeve of the casing 2.

[0048] 3. Adhere the concave sides of N third-specification irregular-shaped protective tapes one end to the other and attach them to the rear half of the inner sleeve of the casing to the front end face 3 of the outer sleeve of the combustion chamber, thus completing the work of filling the gaps of the irregular-shaped protective tapes on the components.

[0049] Example 1

[0050] A protective device for grinding a casing includes four first-size irregularly shaped protective sheets, four second-size irregularly shaped protective sheets, four third-size irregularly shaped protective sheets, and a gap-filling tool.

[0051] The first type of irregularly shaped protective tape is a 1 / 4 ring structure. The inner diameter of the ring is 740mm, the outer diameter is 850mm, and the ring width is 70mm. Four rings of this type of irregularly shaped protective tape, connected end-to-end on one side, can form a truncated cone with an upper diameter of 850mm, a lower diameter of 740mm, and a height of 70mm. This first type of irregularly shaped protective tape is made of fluorosilicone rubber with a thickness of 0.12mm and a tensile elongation of 0.

[0052] The second type of irregularly shaped protective tape is a 1 / 4 ring structure. The inner diameter of the ring is 496 mm, the outer diameter is 759 mm, and the ring width is 157.2 mm. Four rings of this second type of irregularly shaped protective tape can be joined together to form a frustum with an upper diameter of 759 mm, a lower diameter of 496 mm, and a height of 157.2 mm. This second type of irregularly shaped protective tape is made of fluorosilicone rubber with a thickness of 0.19 mm and a tensile elongation of 20%.

[0053] The gap-filling tool is used in conjunction with a second-sized irregularly shaped protective sheet to completely fill the gap between the housing and the guide. The gap-filling tool includes a filling tongue 4, a connecting rod 5, and an elastic filling tongue 6 connected in sequence. The filling tongue 4 is used to insert the second-sized irregularly shaped protective sheet into the gap between the housing and the guide. The elastic filling tongue 6 is used to compact and press the second-sized irregularly shaped protective sheet in the gap. The elastic filling tongue 6 includes a compaction upper section and a compaction lower section. One end of the compaction lower section is connected to the bottom of the connecting rod 5, and the other end is connected to the compaction upper section. There is an angle between the compaction lower section and the connecting rod 5, and there is elastic deformation between the compaction lower section and the compaction upper section. The elastic filling tongue 6 utilizes the elastic deformation between the compaction lower section and the compaction upper section to apply pressure in both the upper and lower directions in the middle of the gap, thus compacting and pressing the second-sized irregularly shaped protective sheet.

[0054] The third type of irregularly shaped protective tape has a quadrilateral structure with a convex arc at the top, concave arcs on both sides, and a straight bottom. The distance between the two ends of the top edge is greater than the distance between the two ends of the bottom edge. Four of these irregularly shaped protective tapes overlap end-to-end to form an hourglass-shaped structure composed of an inverted frustum and a right frustum. The inverted frustum has an upper base diameter of 759mm, a lower base diameter of 625mm, and a height of 68.4mm. The right frustum has an upper base diameter of 625mm, a lower base diameter of 496mm, and a height of 88.8mm. This third type of irregularly shaped protective tape uses fluorosilicone rubber tape with a thickness of 0.10mm and a tensile elongation of 0.

[0055] The method for protecting the main combustion unit casing using the aforementioned protective device for casing grinding includes the following steps:

[0056] 1. Connect the four first-specification irregular-shaped protective tapes end to end on one side of their ring width and stick them to the inner wall of the combustion chamber and the rear end face of the high-pressure turbine casing.

[0057] 2. Connect the four second-specification irregular-shaped protective tapes end to end on one side of the ring width and stick them to the front face of the turbine casing to the rear half of the casing inner sleeve. Insert the connection between the top and bottom sections of the gap filling tool into the gap between the casing and the guide, so that the second-specification irregular-shaped protective tapes can be completely adhered to the front face of the turbine casing and the rear half of the casing inner sleeve.

[0058] 3. Overlap the concave sides of the four third-specification irregular-shaped protective tapes by 1 / 2 of their area, and then attach them sequentially to the rear half of the inner casing to the front of the outer casing of the combustion chamber, thus completing the work of filling the gaps of the irregular-shaped protective tapes on the components.

[0059] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A protective device for grinding a machine casing, characterized in that, The first type of irregularly shaped protective tape, the second type of irregularly shaped protective tape, and the third type of irregularly shaped protective tape are all used to protect high-pressure turbine casings. The first and second specifications of irregularly shaped protective tape are both 1 / N circular rings, with the ring width of the second specification being greater than that of the first specification. The third specification of irregularly shaped protective tape has a quadrilateral structure, with an outwardly convex arc at the top, inwardly concave arcs on both sides, and a straight bottom. The distance between the two ends of the top edge is greater than the distance between the two ends of the bottom edge. Wherein, N is a positive integer. N first-specification irregular-shaped protective rubber sheets are connected end to end on one side to form a frustum I, which is used to protect the inner wall of the outer casing of the combustion chamber and the rear end face of the high-pressure turbine casing (1); N second-specification irregular-shaped protective rubber sheets are connected end to end on one side to form a frustum II, which is used to protect the front end face of the high-pressure turbine casing to the rear half of the casing inner sleeve (2); N third-specification irregular-shaped protective rubber sheets are connected end to end on the concave side to form an hourglass structure, which is formed by connecting an inverted frustum and a regular frustum, and is used to protect the rear half of the casing inner sleeve to the front end face of the outer casing of the combustion chamber (3).

2. The protective device for grinding a casing according to claim 1, characterized in that, The generatrix of the frustum I is greater than or equal to the length from the inner wall of the outer casing of the combustion chamber to the rear end face of the high-pressure turbine casing; the circumference of the top surface of the frustum I is greater than or equal to the circumference of the inner wall of the outer casing of the combustion chamber; and the circumference of the bottom surface of the frustum I is greater than or equal to the circumference of the rear end face of the high-pressure turbine casing.

3. The protective device for grinding a casing according to claim 1, characterized in that, The generatrix of the frustum II is greater than or equal to the length from the front end face of the high-pressure turbine casing to the rear end face of the inner sleeve of the casing; the circumference of the top surface of the frustum II is greater than or equal to the circumference of the front end face of the high-pressure turbine casing; and the circumference of the bottom surface of the frustum II is greater than or equal to the circumference of the rear end face of the inner sleeve of the casing.

4. A protective device for grinding a casing according to claim 1, characterized in that, The circumference of the top surface of the inverted frustum is greater than or equal to the circumference of the rear end face of the inner casing; the circumference of the bottom surface of the inverted frustum is equal to the circumference of the top surface of the right frustum, which is greater than or equal to the circumference of the front end face of the inner casing; the generatrix length of the inverted frustum is greater than or equal to the wall length from the front end to the rear end of the inner casing; the circumference of the bottom surface of the right frustum is greater than or equal to the circumference of the front end face of the front sealing ring, which is greater than or equal to the wall length from the front end to the rear end of the front sealing ring.

5. A protective device for grinding a casing according to claim 1, characterized in that, When N third-specification irregular-shaped protective tapes are connected end to end on their concave sides, the overlapping area of ​​two adjacent third-specification irregular-shaped protective tapes is 1 / 2 to 1 / 3 of the area of ​​the third-specification irregular-shaped protective tape.

6. A protective device for grinding a casing according to claim 1, characterized in that, The thickness of the second type of irregularly shaped protective tape is greater than or equal to the gap between the high-pressure turbine casing and the guide.

7. A protective device for grinding a machine casing according to any one of claims 1 to 6, characterized in that, It also includes a gap filling tool used in conjunction with the second type of special-shaped protective tape. The gap filling tool includes a filling tongue (4), a connecting rod (5) and an elastic filling tongue (6) connected in sequence. The elastic filling tongue (6) includes a compacted upper section and a compacted lower section. One end of the compacted lower section is connected to the bottom of the connecting rod (5) and the other end is connected to the compacted upper section. There is an angle between the compacted lower section and the connecting rod (5), and there is elastic deformation between the compacted lower section and the compacted upper section.

8. A protective device for grinding a machine casing according to any one of claims 1 to 6, characterized in that, The first and third specifications of irregularly shaped protective tape have a tensile elongation of 0, while the second specification of irregularly shaped protective tape has a tensile elongation of 10% to 30%.

9. A method for protecting the main combustion unit casing using the protective device for casing grinding as described in any one of claims 1 to 8, characterized in that, Connect the ends of N first-specification irregular-shaped protective tapes to the inner wall of the outer casing of the combustion chamber and the rear end of the high-pressure turbine casing (1). Connect the ends of N second-specification irregular-shaped protective tapes to the front end of the high-pressure turbine casing and the rear half of the casing inner casing (2). Connect the ends of N third-specification irregular-shaped protective tapes to the concave side of the inner casing and the rear half of the casing inner casing and the front end of the outer casing of the combustion chamber (3). This completes the protection of the main combustion unit casing.

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