High-temperature air pipeline compensation structure penetrating through three-layer casing

Abstract

The invention provides a high-temperature air pipeline compensation structure penetrating through a three-layer casing, which is mounted on a host casing, the host casing comprises an inner-layer casing, a middle-layer casing and an outer-layer casing, and the high-temperature air pipeline compensation structure penetrating through the three-layer casing comprises an inner guide pipe fixedly connected with the inner-layer casing; the outer guide pipe is fixedly connected with the outer-layer casing; the lower floating ring abuts against the middle-layer casing, and one end of the inner guide pipe is inserted into the lower floating ring and can axially move relative to the lower floating ring; the upper floating ring abuts against the lower floating ring, and one end of the outer guide pipe is inserted into the upper floating ring and can axially move relative to the upper floating ring; the upper floating ring is radially movable relative to the lower floating ring. According to the invention, the inconsistent radial and axial deformation among the three layers of casings can be automatically compensated, and a relatively large compensation amount can be realized; the structure comprises a small number of parts, and the parts are simple in structural shape and high in structural reliability.

Description

Technical Field

[0001] The invention relates to the technical field of aircraft engine structures, and in particular to a high-temperature air pipeline compensation structure passing through a three-layer casing. Background Art

[0002] The use of a multi-bypass mode in a certain engine can broaden the range of engine bypass ratio variations and reduce the engine fuel consumption rate. To ensure the safe and reliable operation of the engine, air must be drawn from the engine core through an air pipeline passing through the three-layer casing. Due to the high flight speed of the engine, the bleed air temperature is higher than 600°C, which exceeds the operating temperature range of traditional sealing components such as rubber seals or graphite seals. In addition, due to differences in ambient temperature, load, and other conditions of each layer of the casing, there are different deformations between the casings along the axial and radial directions of the engine. In order to coordinate the deformation between the casings, the high-temperature air pipeline passing through the three-layer casing needs to have the ability to compensate for deformation along the axial and radial directions of the engine. Summary of the invention

[0003] In view of this, the present invention provides a high-temperature air pipeline compensation structure passing through a three-layer casing, so as to achieve compensation for the uncoordinated axial and radial deformation of the three-layer casing.

[0004] The present invention provides the following technical solutions: a high-temperature air pipeline compensation structure passing through a three-layer casing is installed on a main engine casing, the main engine casing includes an inner casing, a middle casing and an outer casing, and the high-temperature air pipeline compensation structure passing through the three-layer casing includes: an inner conduit fixedly connected to the inner casing; an outer conduit fixedly connected to the outer casing; a lower floating ring abutting the middle casing, one end of the inner conduit is inserted into the lower floating ring and can move axially relative to the lower floating ring; an upper floating ring abutting the lower floating ring, one end of the outer conduit is inserted into the upper floating ring and can move axially relative to the upper floating ring; the upper floating ring can move radially relative to the lower floating ring.

[0005] Furthermore, the high-temperature air pipeline compensation structure passing through the three-layer casing also includes a pressure plate, which is fixedly connected to the middle casing and has a gap with the upper floating ring.

[0006] Furthermore, the inner duct includes: an inner duct flange structure fixedly connected to the inner casing; an inner duct round tube structure integrally arranged with the inner duct flange structure, and one end of the inner duct round tube structure away from the inner duct flange structure is plugged into and matched with the lower floating ring.

[0007] Furthermore, the outer conduit includes: an outer conduit flange structure fixedly connected to the outer casing; an outer conduit circular tube structure integrally arranged with the outer conduit flange structure, and one end of the outer conduit circular tube structure away from the outer conduit flange structure is plug-fitted with the upper floating ring.

[0008] Furthermore, the lower floating ring includes: a lower floating ring flange structure, which is abutted against the middle casing; a lower floating ring sleeve structure, which is integrally arranged with the lower floating ring flange structure, and the lower floating ring sleeve structure is plugged and matched with the inner guide tube circular tube structure.

[0009] Furthermore, the upper floating ring includes: an upper floating ring flange structure, which abuts against the lower floating ring flange structure; an upper floating ring sleeve structure, which is integrally arranged with the upper floating ring flange structure, and the upper floating ring sleeve structure is plugged and matched with the outer catheter circular tube structure.

[0010] Furthermore, a lower floating ring countersunk hole is arranged at one end of the middle portion of the lower floating ring; and an upper floating ring countersunk hole is arranged at one end of the middle portion of the upper floating ring.

[0011] Furthermore, a lower floating ring guide angle is provided at the other end of the middle portion of the lower floating ring; and an upper floating ring guide angle is provided at the other end of the middle portion of the upper floating ring.

[0012] Furthermore, the inner conduit, the outer conduit, the lower floating ring and the upper floating ring are all made of the same material.

[0013] Compared with the prior art, the beneficial effects that can be achieved by at least one of the above-mentioned technical solutions adopted by the present invention include at least the following: the present invention can automatically compensate for the uncoordinated radial and axial deformations occurring between the three-layer casings, and can achieve a larger compensation amount; the structure contains a small number of parts, the parts have a simple structural shape, and the structural reliability is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a schematic diagram of a high-temperature air pipeline compensation structure passing through a three-layer casing of the present invention;

[0016] Figure 2 It is a schematic diagram of the lower floating ring structure of a high-temperature air pipeline compensation structure passing through a three-layer casing of the present invention;

[0017] Figure 3 It is a schematic diagram of the upper floating ring structure of a high-temperature air pipeline compensation structure passing through a three-layer casing of the present invention;

[0018] Figure 4 It is a schematic diagram of realizing radial and axial compensation of a high-temperature air pipeline compensation structure passing through a three-layer casing of the present invention.

[0019] Reference numerals in the figure: 1. inner casing; 2. middle casing; 3. outer casing; 4. pipeline assembly; 41. inner guide tube; 411. flange structure; 412. circular tube structure; 42. outer guide tube; 421. flange structure; 422. circular tube structure; 43. lower floating ring; 431. lower floating ring flange structure; 432. sleeve structure; 433. guide angle; 434. lower floating ring countersunk hole; 44. upper floating ring; 441. upper floating ring flange structure; 442. sleeve structure; 443. guide angle; 444. upper floating ring countersunk hole; 45. pressure plate. DETAILED DESCRIPTION

[0020] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0021] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0022] like Figures 1 to 4 As shown, an embodiment of the present invention provides a high-temperature air pipeline compensation structure passing through a three-layer casing, including an inner casing 1, a middle casing 2, an outer casing 3 and a pipeline assembly 4. The middle casing 2 and the outer casing 3 are coaxially sleeved on the outer side of the inner casing 1 in sequence. The pipeline assembly 4 includes an inner conduit 41, an outer conduit 42, a lower floating ring 43, an upper floating ring 44 and a pressure plate 45; the inner conduit 41 includes a flange structure 411 and a circular tube structure 412, and the inner conduit 41 is fixedly connected to the outer side of the inner casing 1 through the flange structure 411; the outer conduit 42 includes a flange structure 421 and a circular tube structure 422, and the circular tube structure 422 end of the outer conduit 42 passes through the outer casing 3, and the outer conduit 42 is fixedly connected to the outer side of the outer casing 3 through the flange structure 421.

[0023] according to Figure 2As shown, the lower floating ring 43 includes a lower floating ring flange structure 431 and a sleeve structure 432; the sleeve structure 432 of the lower floating ring 43 passes through the middle casing 2 and is then sleeved on the circular tube structure 412 of the inner guide tube 41, the sleeve structure 432 and the circular tube structure 412; the lower floating ring flange structure 431 of the lower floating ring 43 is installed on the outer side of the middle casing 2, and a clearance fit is adopted between the lower floating ring 43 and the inner guide tube 41, and the tolerance at the fit can be H7 / h6, and they can slide relative to each other along the axial direction, and the lower floating ring 43 can slide laterally along the outer side of the middle casing 2.

[0024] according to Figure 3 As shown, the upper floating ring 44 includes an upper floating ring flange structure 441 and a sleeve structure 442; the sleeve structure 442 of the upper floating ring 44 is sleeved on the circular tube structure 422 of the outer guide tube 42, the upper floating ring flange structure 441 of the upper floating ring 44 contacts the end of the lower floating ring flange structure 431 of the lower floating ring 43, and a clearance fit is adopted between the upper floating ring 44 and the outer guide tube 42, and the tolerance at the fit can be H7 / h6, and they can slide relative to each other along the axial direction, and the upper floating ring 44 and the lower floating ring 43 can slide relative to each other; the pressure plate 45 is fixed to the outer side of the middle casing 2 by bolts, and the pressure plate 45 limits the lower floating ring 43 and the upper floating ring 44, and there is a gap between the pressure plate 45 and the upper floating ring 44, so that the lower floating ring 43 and the upper floating ring 44 can only slide laterally in the cavity formed between the pressure plate 45 and the middle casing 2.

[0025] The inner conduit 41 and the outer conduit 42 have the same diameter. The outer diameter of the end of the circular tube structure 412 of the inner conduit 41 is larger than the diameter of the rest of the circular tube structure 412 . The outer diameter of the end of the circular tube structure 422 of the outer conduit 42 is larger than the diameter of the rest of the circular tube structure 422 .

[0026] The contact ends of the lower floating ring 43 and the upper floating ring 44 are respectively provided with a lower floating ring countersunk hole 434 and an upper floating ring countersunk hole 444. The inner diameters of the lower floating ring countersunk hole 434 and the upper floating ring countersunk hole 444 are determined according to the maximum lateral relative displacement between the lower floating ring 43 and the upper floating ring 44 and the diameter size of the lower floating ring 43, so as to ensure that the effective diameter of the pipeline assembly 4 is not less than the diameter of the inner guide tube 41.

[0027] The inner guide tube 41, the outer guide tube 42, the lower floating ring 43, the upper floating ring 44, the pressure plate 45 and the middle casing 2 are made of the same high temperature resistant material to ensure that the linear expansion coefficients of the various parts are the same.

[0028] After the inner guide tube 41 is installed, the top end of the circular tube structure 412 is lower than the inner side of the middle casing 2 , so that after the inner guide tube is installed in the inner casing 1 , the middle casing 2 can be assembled normally.

[0029] The lower floating ring 43 and the upper floating ring 44 are respectively provided with guide angles 433 and 443 on the inner sides of the sleeve ends of the inner conduit 41 and the outer conduit 42 to facilitate the installation of parts.

[0030] according to Figure 4 As shown, the compensation principle of a high-temperature air pipeline compensation structure passing through a three-layer casing is explained: the inner duct 41 and the lower floating ring 43 are clearance-matched, and the two can slide relative to each other along the axial direction of the fitting surface; the outer duct 42 and the upper floating ring 44 are clearance-matched, and the two can slide relative to each other along the axial direction of the fitting surface; the lower floating ring 43 and the upper floating ring 44 can slide relative to each other along the contact surface, and both the lower floating ring 43 and the upper floating ring 44 can slide in the inner cavity formed by the pressure plate 45 and the middle casing 2. When uncoordinated axial and radial deformations occur between the inner casing 1, the middle casing 2, and the outer casing 3, the inner duct 41 and the outer duct 42 slide along the axial directions of the lower floating ring 43 and the upper floating ring 44, respectively, and at the same time, the lower floating ring 43 and the upper floating ring 44 can slide in the inner cavity formed by the pressure plate 45 and the middle casing 2, thereby achieving deformation compensation between the casings. The inner diameter of the lower floating ring countersunk hole 434 of the lower floating ring 43 and the inner diameter of the upper floating ring countersunk hole 444 of the upper floating ring 44 can be the same. The size of the inner diameters must meet the requirement that when the lower floating ring 43 and the upper floating ring 44 have a limit displacement, the effective flow channel diameter of the pipeline assembly 4 is not less than the diameter of the inner guide tube 41, to ensure that no throttling occurs in the pipeline assembly 4 during the operation of the engine.

[0031] At the same time, since the linear expansion coefficients of the materials of the inner duct 41, the outer duct 42, the lower floating ring 43, the upper floating ring 44, the pressure plate 45 and the middle casing 2 are the same, when thermal expansion occurs under the action of high-temperature air, the gaps between the parts remain unchanged, so that the parts will not get stuck or the gaps will not increase, which can effectively avoid the failure of the structural compensation function or the increase of air leakage.

[0032] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A high-temperature air pipeline compensation structure passing through a three-layer casing, installed on a main engine casing, wherein the main engine casing comprises an inner casing (1), a middle casing (2) and an outer casing (3), characterized in that: The high temperature air pipeline compensation structure passing through the three-layer casing includes: An inner guide tube (41) is fixedly connected to the inner casing (1); An outer guide tube (42) is fixedly connected to the outer casing (3); A lower floating ring (43) is in contact with the middle casing (2), and one end of the inner guide tube (41) is inserted into the lower floating ring (43) and can move axially relative to the lower floating ring (43); The upper floating ring (44) is in contact with the lower floating ring (43), one end of the outer guide tube (42) is inserted into the upper floating ring (44) and can move axially relative to the upper floating ring (44); the upper floating ring (44) can move radially relative to the lower floating ring (43).

2. The high-temperature air pipeline compensation structure passing through a three-layer casing according to claim 1 is characterized in that: The high-temperature air pipeline compensation structure passing through the three-layer casing also includes a pressure plate (45), which is fixedly connected to the middle casing (2) and is spaced apart from the upper floating ring (44).

3. The high temperature air pipeline compensation structure passing through the three-layer casing according to claim 1 is characterized in that: The inner catheter (41) comprises: An inner guide tube flange structure (411) is fixedly connected to the inner casing (1); The inner conduit circular tube structure (412) is integrally arranged with the inner conduit flange structure (411), and one end of the inner conduit circular tube structure (412) away from the inner conduit flange structure (411) is plug-fitted with the lower floating ring (43).

4. The high temperature air pipeline compensation structure passing through the three-layer casing according to claim 3 is characterized in that: The outer catheter (42) comprises: An outer conduit flange structure (421) is fixedly connected to the outer casing (3); The outer conduit circular tube structure (422) is integrally arranged with the outer conduit flange structure (421), and one end of the outer conduit circular tube structure (422) away from the outer conduit flange structure (421) is plug-fitted with the upper floating ring (44).

5. The high temperature air pipeline compensation structure passing through the three-layer casing according to claim 4 is characterized in that: The lower floating ring (43) comprises: The lower floating ring flange structure (431) is in contact with the middle casing (2); The lower floating ring sleeve structure (432) is integrally arranged with the lower floating ring flange structure (431), and the lower floating ring sleeve structure (432) is plug-fitted with the inner guide tube circular tube structure (412).

6. The high temperature air pipeline compensation structure passing through the three-layer casing according to claim 5 is characterized in that: The upper floating ring (44) comprises: The upper floating ring flange structure (441) abuts against the lower floating ring flange structure (431); The upper floating ring sleeve structure (442) is integrally arranged with the upper floating ring flange structure (441), and the upper floating ring sleeve structure (442) is plug-fitted with the outer conduit circular tube structure (422).

7. The high temperature air pipeline compensation structure passing through the three-layer casing according to claim 1 is characterized in that: A lower floating ring countersunk hole (434) is provided at one end of the middle portion of the lower floating ring (43); An upper floating ring countersunk hole (444) is provided at one end of the middle portion of the upper floating ring (44).

8. The high temperature air pipeline compensation structure passing through the three-layer casing according to claim 7 is characterized in that: A lower floating ring guide angle (433) is provided at the other end of the middle portion of the lower floating ring (43); An upper floating ring guide angle (443) is provided at the other end of the middle portion of the upper floating ring (44).

9. The high temperature air pipeline compensation structure passing through a three-layer casing according to claim 1 is characterized in that: The inner conduit (41), the outer conduit (42), the lower floating ring (43) and the upper floating ring (44) are all made of the same material.

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