A sealing structure between the casing and guide sleeve of a turbojet engine

Abstract

This utility model relates to the field of turbojet engine technology, and more particularly to a sealing structure between the casing and guide sleeve of a turbojet engine. It includes a casing body and a guide sleeve body connected to the casing body. The sealing surface of the casing body has a downward-opening first sealing ring groove. The sealing surface of the guide sleeve body has an upward-extending first sealing ring piece that can extend into the first sealing ring groove. A chamfered first abutment is provided at the corner where the inner circumferential surface of the first sealing ring groove meets the sealing surface of the casing body. The first sealing ring piece is arc-shaped and is a thin, sheet-like metal annular spring. In the radial direction, the starting point of the first sealing ring piece is further inward than the radial position of the first abutment, so that when the casing body and the guide sleeve body are connected, the first abutment presses the first sealing ring piece down until the upper half of the first sealing ring piece is tightly against the outer circumferential surface of the first sealing ring groove. This structural design enhances sealing performance and extends service life.

Description

Technical Field

[0001] This utility model relates to the field of turbojet engine technology, and in particular to a sealing structure between the casing and the guide sleeve of a turbojet engine. Background Technology

[0002] In the field of turbojet engine technology, the sealing structure between the casing and the guide sleeve is crucial, as its performance directly affects the engine's fuel efficiency, thermal efficiency, and operational stability and reliability. In traditional designs, the connection between the casing and the guide sleeve is achieved radially by using elastomeric seals (such as fluororubber O-rings) on the connection end faces. However, under high temperature and high pressure conditions, the elastomeric seals age rapidly with continuous operation, leading to seal failure, loosening, and oil leakage. Furthermore, the seals are prone to cold-flow deformation under pressure, making it difficult to maintain sealing pressure after long-term operation, requiring frequent maintenance and replacement. Therefore, it is necessary to improve the existing technology to solve these problems. Utility Model Content

[0003] The purpose of this invention is to provide a sealing structure between the casing and the guide sleeve of a turbojet engine, which aims to solve the problem that the existing technology uses elastomeric seals between the casing and the guide sleeve, which are prone to aging and thus lead to seal failure.

[0004] To achieve the above objectives, this utility model provides a sealing structure between the casing and the guide sleeve of a turbojet engine, including a casing body and a guide sleeve body connected to the casing body. The sealing surface of the casing body is provided with a first sealing ring groove opening downwards, and the sealing surface of the guide sleeve body is provided with a first sealing ring piece extending upwards. The first sealing ring piece can extend into the first sealing ring groove. At the corner where the inner circumferential surface of the first sealing ring groove meets the sealing surface of the casing body, a chamfered first abutment is provided. The first abutment can contact and abut against the first sealing ring piece. The first sealing ring piece is arc-shaped and is a thin sheet-like metal ring spring. In the radial direction, the starting point of the first sealing ring piece is further inward than the position of the first abutment, so that when the casing body and the guide sleeve body are connected, the first abutment presses the first sealing ring piece down so that the upper half of the first sealing ring piece is tightly attached to the outer circumferential surface of the first sealing ring groove.

[0005] Furthermore, the sealing surface of the main body of the casing is also provided with a second sealing ring groove with an opening facing downwards, and the sealing surface of the guide sleeve body is also provided with a second sealing ring piece extending upwards. The second sealing ring piece can extend into the second sealing ring groove and the second sealing ring piece and the second sealing ring groove are interference fit. The corner between the inner circumferential surface of the second sealing ring groove and the sealing surface of the main body of the casing is provided with a chamfered second abutment. The second sealing ring piece is arc-shaped and is a thin sheet-like metal ring spring. In the radial direction, the starting point of the second sealing ring piece is further inward than the position of the second abutment, so that when the main body of the casing is connected to the guide sleeve body, the second abutment presses the second sealing ring piece down to make the upper half of the second sealing ring piece tightly adhere to the outer circumferential surface of the second sealing ring groove.

[0006] Furthermore, in the radial direction, the second sealing ring groove is located further out than the first sealing ring groove, the height of the first sealing ring groove is greater than the second sealing ring groove, the second sealing ring plate is located further out than the first sealing ring plate, and the height of the first sealing ring plate is greater than the second sealing ring plate.

[0007] Furthermore, the cross-sections of both the first sealing ring groove and the second sealing ring groove are right-angled trapezoidal shapes. The inner circumferential surfaces of both the first sealing ring groove and the second sealing ring groove are vertical surfaces, and the outer circumferential surfaces are inclined surfaces. The upper and lower widths of the first sealing ring groove are both smaller than the width between the crests and troughs of the first sealing ring plate, and the upper and lower widths of the second sealing ring groove are both smaller than the width between the crests and troughs of the second sealing ring plate.

[0008] Furthermore, the outer peripheral surfaces of the first sealing ring groove and the second sealing ring groove are guide slopes, and the outer peripheral surfaces of the first sealing ring piece and the second sealing ring piece are mating slopes corresponding to the guide slopes.

[0009] Furthermore, the main body of the casing is provided with a connecting concave ring, and the main body of the guide sleeve is provided with a connecting convex ring that fits into the connecting concave ring.

[0010] Furthermore, the main body of the casing and the main body of the guide sleeve are connected by a connecting assembly, which includes a first connecting ring and a second connecting ring. The main body of the casing is provided with a first connecting boss, and the main body of the guide sleeve is provided with a second connecting boss. The first connecting boss and the second connecting boss form a positioning boss. Both the first connecting ring and the second connecting ring are provided with positioning grooves that fit with the positioning boss. Both ends of the first connecting ring and the second connecting ring are provided with connecting blocks. The connecting blocks of the first connecting ring and the connecting blocks of the second connecting ring are connected by screws.

[0011] Furthermore, the first connecting boss is provided with a first clamping inclined surface, the second connecting boss is provided with a second clamping inclined surface, and the positioning groove is provided with a first pressing inclined surface that cooperates with the first clamping inclined surface and a second pressing inclined surface that cooperates with the second clamping inclined surface.

[0012] This utility model provides a sealing structure between the casing and guide sleeve of a turbojet engine. Compared with the prior art, when the casing body and the guide sleeve body are connected and assembled, the first sealing ring is first inserted axially into the first sealing ring groove on the casing body. The first abutment of the first sealing ring groove presses down the first sealing ring, making the upper part of the first sealing ring tightly adhere to the outer circumferential surface of the first sealing ring groove, thereby forming a first-level sealing barrier between the first abutment and the first sealing ring. The first sealing ring and the outer circumferential surface of the first sealing ring groove form a second-level sealing barrier. Therefore, when high-pressure and high-temperature medium flows out from the connection interface between the casing body and the guide sleeve body, the high-pressure and high-temperature medium is prevented from continuing to flow out at the first-level sealing barrier. If a small amount of high-pressure and high-temperature medium flows out from the first sealing barrier, there is still a second-level sealing barrier for sealing protection, thereby achieving double sealing protection within the first sealing ring groove, enhancing the sealing performance, and effectively preventing the high-pressure and high-temperature medium from leaking outward. The first sealing ring is a thin sheet-like metal ring spring, which is resistant to high temperatures and has a long service life. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0014] Figure 2 This is a cross-sectional view of the present invention;

[0015] Figure 3 yes Figure 2 A magnified structural diagram of part A in the middle;

[0016] Figure 4 This is a partial view of the main body of the casing and the main body of the guide sleeve before they are connected;

[0017] Figure 5 This is a partial view of the first abutment and the first sealing ring plate just coming into contact when the main body of the casing is connected to the main body of the guide sleeve.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1. Casing body; 11. First sealing ring groove; 111. First abutment; 112. Guide slope; 12. Second sealing ring groove; 121. Second abutment; 13. Connecting concave ring; 14. First connecting boss; 141. First clamping slope; 15. Positioning boss;

[0020] 2. Guide sleeve body; 21. First sealing ring; 211. Mating bevel; 22. Second sealing ring; 23. Connecting protrusion; 24. Second connecting boss; 241. Second clamping bevel;

[0021] 3. Connecting components; 31. First connecting ring; 311. Positioning groove; 3111. First pressing slope; 3112. Second pressing slope; 312. Connecting block; 32. Second connecting ring. Detailed Implementation

[0022] The present invention will be described in detail below with reference to specific embodiments.

[0023] In this utility model, unless otherwise explicitly specified and limited, when terms such as "set in," "connected," or "linked" appear, these terms should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or a connection through one or more intermediate media. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. The directional terms appearing in this utility model are for the purpose of better describing the characteristics of the features and the relationships between them. It should be understood that when the placement direction of this utility model changes, the direction of the characteristics of the features and the relationships between them also changes accordingly. Therefore, directional terms do not constitute an absolute limitation on the characteristics of the features and the relationships between them in space, but only a relative limitation.

[0024] This utility model provides a sealing structure between the casing and the guide sleeve of a turbojet engine, such as... Figures 1 to 5 As shown, it includes a casing body 1 and a guide sleeve body 2 connected to the casing body 1. The sealing surface of the casing body 1 is provided with a first sealing ring groove 11 with an opening facing downward. The sealing surface of the guide sleeve body 2 is provided with a first sealing ring piece 21 extending upward. The first sealing ring piece 21 can extend into the first sealing ring groove 11. At the corner where the inner circumferential surface of the first sealing ring groove 11 meets the sealing surface of the casing body 1, a chamfered first abutment 111 is provided. The first sealing ring piece 21 is arc-shaped and is a thin sheet-like metal ring spring. In the radial direction, the starting point of the first sealing ring piece 21 is further inward than the position of the first abutment 111, so that when the casing body 1 is connected to the guide sleeve body 2, the first abutment 111 presses the first sealing ring piece 21 down so that the upper half of the first sealing ring piece 21 is tightly attached to the outer circumferential surface of the first sealing ring groove 11.

[0025] Based on the above structural configuration, when the casing body 1 and the guide sleeve body 2 are connected and assembled, the first sealing ring 21 is first inserted axially into the first sealing ring groove 11 on the casing body 1. The first abutment 111 of the first sealing ring groove 11 presses down the first sealing ring 21, making the upper part of the first sealing ring 21 tightly adhere to the outer circumferential surface of the first sealing ring groove 11, thereby forming a first-level sealing barrier between the first abutment 111 and the first sealing ring 21, and forming a second-level sealing barrier between the first sealing ring 21 and the outer circumferential surface of the first sealing ring groove 11. Therefore, when the high-pressure and high-temperature medium flows out from the connection interface between the casing body 1 and the guide sleeve body 2, the high-pressure and high-temperature medium is prevented from continuing to flow out at the first-level sealing barrier. If a small amount of high-pressure and high-temperature medium flows out from the first sealing barrier, there is still a second-level sealing barrier for sealing protection, thereby achieving double sealing protection within the first sealing ring groove 11, enhancing the sealing performance, and effectively preventing the high-pressure and high-temperature medium from leaking outward. The first sealing ring 21 is a thin sheet-like metal ring spring, which is resistant to high temperatures and has a long service life.

[0026] In this embodiment, the sealing surface of the casing body 1 is further provided with a downward-opening second sealing ring groove 12, and the sealing surface of the guide sleeve body 2 is further provided with an upward-extending second sealing ring piece 22. The second sealing ring piece 22 can extend into the second sealing ring groove 12. A chamfered second abutment 121 is provided at the corner between the inner circumferential surface of the second sealing ring groove 12 and the sealing surface of the casing body 1. The second sealing ring piece 22 is arc-shaped and is a thin sheet-like metal ring spring. In the radial direction, the starting point of the second sealing ring piece 22 is further inward than the position of the second abutment 121, so that when the casing body 1 is connected to the guide sleeve body 2, the second abutment 121 presses the second sealing ring piece 22 down so that the upper half of the second sealing ring piece 22 is tightly attached to the outer circumferential surface of the second sealing ring groove 12. A staged seal is formed by the second sealing ring groove 12 and the second sealing ring piece 22. First, the main pressure is handled by the sealing protection between the first sealing ring piece 21 and the first sealing ring groove 11, and then the sealing protection between the second sealing ring piece 22 and the second sealing ring groove 12 serves as an auxiliary, further enhancing the sealing performance and improving the sealing effect.

[0027] In this embodiment, in the radial direction, the second sealing ring groove 12 is positioned further outward than the first sealing ring groove 11, and the height of the first sealing ring groove 11 is greater than that of the second sealing ring groove 12. Similarly, the second sealing ring piece 22 is positioned further outward than the first sealing ring piece 21, and the height of the first sealing ring piece 21 is greater than that of the second sealing ring piece 22. During assembly, the assembler can first observe and ensure that the first sealing ring piece 21 can be inserted into the first sealing ring groove 11, and then observe and ensure that the second sealing ring piece 22 can be inserted into the second sealing ring groove 12, ensuring that each ring piece is correctly positioned and reducing assembly errors.

[0028] In this embodiment, the cross-sections of the first sealing ring groove 11 and the second sealing ring groove 12 are both right-angled trapezoidal shapes. The inner circumferential surfaces of the first sealing ring groove 11 and the second sealing ring groove 12 are both vertical surfaces, and the outer circumferential surfaces are both inclined surfaces. The upper and lower widths of the first sealing ring groove 11 are both smaller than the width between the crests and troughs of the first sealing ring piece 21, and the upper and lower widths of the second sealing ring groove 12 are both smaller than the width between the crests and troughs of the second sealing ring piece 22. Through the above structural design, it is ensured that the first sealing ring piece 21 and the first sealing ring groove 11, and the first sealing ring piece 21 and the second sealing ring groove 12 can fit tightly together.

[0029] In this embodiment, the outer peripheral surfaces of the first sealing ring groove 11 and the second sealing ring groove 12 are guide slopes 112, and the outer peripheral surfaces of the first sealing ring piece 21 and the second sealing ring piece 22 are mating slopes 211 corresponding to the guide slopes 112. By having the mating slopes 211 and the guide slopes 112 engage and guide each other during assembly, the first sealing ring piece 21 can smoothly enter the first sealing ring groove 11, and the second sealing ring piece 22 can smoothly enter the second sealing ring groove 12, thus improving assembly efficiency.

[0030] In this embodiment, the casing body 1 is provided with a connecting concave ring 13, and the guide sleeve body 2 is provided with a connecting convex ring 23 that fits into the connecting concave ring 13. When the casing body 1 and the guide sleeve body 2 are connected and assembled, the connecting concave ring 13 and the connecting convex ring facilitate the alignment of the casing body 1 and the guide sleeve body 2, thereby improving assembly efficiency.

[0031] In this embodiment, the casing body 1 and the guide sleeve body 2 are connected by a connecting assembly 3, which includes a first connecting ring 31 and a second connecting ring 32. The casing body 1 is provided with a first connecting boss 14, and the guide sleeve body 2 is provided with a second connecting boss 24. The first connecting boss 14 and the second connecting boss 24 form a positioning boss 15. Both the first connecting ring 31 and the second connecting ring 32 are provided with positioning grooves 311 that fit with the positioning boss 15. Both ends of the first connecting ring 31 and the second connecting ring 32 are provided with connecting blocks 312. The connecting blocks 312 of the first connecting ring 31 and the connecting blocks 312 of the second connecting ring 32 are connected by screws. Through the above structural design, the connection between the casing body 1 and the guide sleeve body 2 is simpler, more convenient, and faster, improving the efficiency of assembly and disassembly.

[0032] In this embodiment, the first connecting boss 14 is provided with a first clamping inclined surface 141, the second connecting boss 24 is provided with a second clamping inclined surface 241, and the positioning groove 311 is provided with a first pressing inclined surface 3111 that cooperates with the first clamping inclined surface 141 and a second pressing inclined surface 3112 that cooperates with the second clamping inclined surface 241. When the first connecting ring 31 and the second connecting ring 32 are pre-tightened with screws through the connecting blocks 312 at both ends, the inclination angle of the aforementioned inclined surfaces will convert the radial pre-tightening force of the screws into an axial pressing force, significantly improving the fatigue resistance and long-term reliability of the connection structure.

[0033] In summary, the sealing structure between the casing and the guide sleeve of this turbojet engine can solve the problem of easy aging and sealing failure caused by the use of elastomeric seals between the casing and the guide sleeve in the prior art.

[0034] Where there is no conflict, the above embodiments and features can be combined with each other.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A seal structure between a casing and a nozzle sleeve of a turbojet engine, characterized in that: The device includes a casing body (1) and a guide sleeve body (2) connected to the casing body (1). The sealing surface of the casing body (1) is provided with a first sealing ring groove (11) opening downwards. The sealing surface of the guide sleeve body (2) is provided with a first sealing ring piece (21) extending upwards. The first sealing ring piece (21) can extend into the first sealing ring groove (11). At the corner where the inner circumferential surface of the first sealing ring groove (11) meets the sealing surface of the casing body (1), a chamfered first abutment is provided. 111), the first sealing ring (21) is arc-shaped and is a thin metal ring spring. In the radial direction, the starting point of the first sealing ring (21) is further inward than the position of the first abutment (111), so that when the casing body (1) is connected to the guide sleeve body (2), the first abutment (111) presses the first sealing ring (21) down to make the upper half of the first sealing ring (21) fit tightly against the outer circumferential surface of the first sealing ring groove (11).

2. The seal between the casing and the guide sleeve of a turbojet engine according to claim 1, characterized in that: The sealing surface of the casing body (1) is also provided with a second sealing ring groove (12) with the opening facing downwards. The sealing surface of the guide sleeve body (2) is also provided with a second sealing ring piece (22) extending upwards. The second sealing ring piece (22) can extend into the second sealing ring groove (12). At the corner where the inner circumferential surface of the second sealing ring groove (12) and the sealing surface of the casing body (1) are respectively provided with a chamfered second abutment (121). The second sealing ring piece (22) is arc-shaped and is a thin sheet-like metal ring spring. In the radial direction, the starting point of the second sealing ring piece (22) is further inward than the position of the second abutment (121), so that when the casing body (1) is connected to the guide sleeve body (2), the second abutment (121) presses the second sealing ring piece (22) down to make the upper half of the second sealing ring piece (22) tightly adhere to the outer circumferential surface of the second sealing ring groove (12).

3. The seal between the casing and the nozzle sleeve of a turbojet engine according to claim 2, characterized in that: In the radial direction, the second sealing ring groove (12) is located further out than the first sealing ring groove (11), the height of the first sealing ring groove (11) is greater than the second sealing ring groove (12), the second sealing ring piece (22) is located further out than the first sealing ring piece (21), and the height of the first sealing ring piece (21) is greater than the second sealing ring piece (22).

4. The seal between the casing and the nozzle sleeve of a turbojet engine according to claim 2, characterized in that: The cross-sections of the first sealing ring groove (11) and the second sealing ring groove (12) are both right-angled trapezoidal shapes. The inner circumferential surfaces of the first sealing ring groove (11) and the second sealing ring groove (12) are both vertical surfaces, and the outer circumferential surfaces are both inclined surfaces. The upper and lower widths of the first sealing ring groove (11) are both smaller than the width between the crest and trough of the first sealing ring piece (21). The upper and lower widths of the second sealing ring groove (12) are both smaller than the width between the crest and trough of the second sealing ring piece (22).

5. The seal between the casing and the guide sleeve of a turbojet engine according to claim 4, characterized in that: The outer peripheral surfaces of the first sealing ring groove (11) and the second sealing ring groove (12) are guide slopes (112), and the outer peripheral surfaces of the first sealing ring piece (21) and the second sealing ring piece (22) are mating slopes (211) corresponding to the guide slopes (112).

6. The seal between the casing and the nozzle sleeve of a turbojet engine according to claim 1, characterized in that: The main body of the casing (1) is provided with a connecting concave ring (13), and the main body of the guide sleeve (2) is provided with a connecting convex ring (23) that fits with the connecting concave ring (13).

7. The seal between the casing and the nozzle sleeve of a turbojet engine according to claim 1, characterized in that: The main body of the casing (1) and the main body of the guide sleeve (2) are connected by a connecting assembly (3). The connecting assembly (3) includes a first connecting ring (31) and a second connecting ring (32). The main body of the casing (1) is provided with a first connecting boss (14), and the main body of the guide sleeve (2) is provided with a second connecting boss (24). The first connecting boss (14) and the second connecting boss (24) form a positioning boss (15). The first connecting ring (31) and the second connecting ring (32) are both provided with positioning grooves (311) that fit with the positioning boss (15). Both ends of the first connecting ring (31) and the second connecting ring (32) are provided with connecting blocks (312). The connecting blocks (312) of the first connecting ring (31) and the connecting blocks (312) of the second connecting ring (32) are connected by screws.

8. The seal between the casing and the nozzle sleeve of a turbojet engine according to claim 7, characterized in that: The first connecting boss (14) is provided with a first clamping inclined surface (141), the second connecting boss (24) is provided with a second clamping inclined surface (241), and the positioning groove (311) is provided with a first pressing inclined surface (3111) that cooperates with the first clamping inclined surface (141) and a second pressing inclined surface (3112) that cooperates with the second clamping inclined surface (241).

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