An air intake passage and engine mounting connection structure

Abstract

The utility model discloses an intake passage and engine mounting connection structure in the technical field of engine connection structure, including metal pipe, the metal pipe is installed between air intake pipe and engine, the outside of metal pipe is provided with the connecting ring, the connecting ring is corresponded to set up with air intake pipe, is equipped with the first connecting hole on the connecting ring, is provided with sealing element between the metal pipe and air intake pipe, is provided with the connecting seat on the metal pipe. The utility model adds the metal pipe transition section of precision machining between the composite intake passage and engine, solves the positioning deviation problem of composite because of solidification deformation, and the metal pipe is rigid intermediary datum, and its high accuracy hole position compensates the composite manufacturing error, and realizes quick accurate assembly through the claw table structure and the buckling design, disperses vibration and pneumatic load, avoids the stratification or stress concentration of composite, and simultaneously, reduces the influence of temperature difference deformation difference to air tightness.

Description

Technical Field

[0001] This utility model relates to the field of engine connection structure technology, and in particular to an intake manifold and engine mounting connection structure. Background Technology

[0002] The connection structure between the air intake and engine of a jet aircraft typically uses a composite material (such as carbon fiber reinforced resin matrix composite) air intake that is connected to an aluminum alloy engine flange. The composite air intake is fixed to the engine's metal connecting ring by bolts or fasteners, and a sealing gasket or bushing may be designed between the two to ensure airtightness.

[0003] However, existing technologies have some problems: when the composite intake duct is directly connected to the engine, the composite material is easily affected by curing deformation during manufacturing, resulting in large deviations in the positioning hole position, making it difficult to accurately align with the engine flange, affecting assembly accuracy and aerodynamic performance; secondly, the molding error of the composite material will cause discontinuity in the aerodynamic shape of the intake duct and engine mating surface, forming a step difference, causing airflow separation and additional drag; in addition, the low stiffness of the composite material and the difference in thermal expansion coefficient with metal will exacerbate stress concentration at the connection, which may lead to structural fatigue or sealing failure after long-term use. These problems directly affect the engine's intake efficiency, structural reliability and maintenance costs. Therefore, we propose an intake duct and engine mounting connection structure. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides an intake duct and engine mounting connection structure. By adding a metal tube at the interface between the intake duct and the engine, and incorporating positioning holes and sealing rings into the metal tube, along with corresponding positioning fixtures for the intake duct metal tube on the aircraft assembly fixture, this system systematically solves problems such as poor intake duct assembly accuracy, uncontrollable misalignment with the engine, and poor sealing at the interface. The purpose of this utility model is achieved as follows: an intake manifold and engine mounting connection structure includes a metal tube, which is installed between the intake manifold and the engine. A connecting ring is provided on the outer side of the metal tube, and the connecting ring is correspondingly provided with the intake manifold. A first connecting hole is provided on the connecting ring. A sealing element is provided between the metal tube and the intake manifold. A connecting seat is provided on the metal tube, and the connecting seat and the connecting ring form a claw structure for limiting the sealing element and engaging the intake manifold.

[0005] Optionally, the metal tube is provided with a convex ring, the inner diameter of which is the same as that of the air intake pipe, and an arc-shaped section is provided between the convex ring and the connecting ring, the arc-shaped section being in contact with the sealing element.

[0006] Optionally, the seal includes a ring plate on which a rubber ring is integrally formed, and the rubber ring contacts the arc-shaped segment.

[0007] Optionally, the connecting seat includes a connecting block, a triangular reinforcing rib is provided between the connecting block and the connecting ring, an ear piece is provided on the connecting block, and a second connecting hole is provided on the ear piece.

[0008] Optionally, an installation area is formed between the connecting block, the connecting ring, and the boss, and the ring piece is disposed within the installation area and fits against the connecting ring.

[0009] Optionally, there are multiple connectors, which are arranged in a circular pattern, and the connector is engaged with the intake pipe.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. By adding a precision-machined metal tube transition section between the composite air intake and the engine, the positioning deviation problem caused by the curing deformation of the composite is solved. The metal tube serves as a rigid intermediate reference, and its high-precision hole position compensates for the manufacturing error of the composite. The claw structure and snap-fit ​​design enable fast and accurate assembly. The triangular reinforcing ribs and the circumferentially distributed connecting seats work together to form a stable multi-point rigid support, dispersing vibration and aerodynamic loads and avoiding composite delamination or stress concentration. At the same time, the thermal expansion coefficient of the metal tube is between that of the composite and the engine metal, which significantly reduces the impact of temperature difference deformation on airtightness.

[0011] 2. The convex ring and arc section design of the metal tube are combined with an integrated rubber ring seal to form a sealing interface. The elastic fit of the arc section and the rubber ring adapts to the assembly tolerance of the composite material and the metal, and maintains a stable seal under high pressure. The inner diameter of the convex ring is precisely matched with the air inlet pipe to ensure a smooth airflow transition and reduce turbulence loss. The metal tube can be machined later to eliminate the aerodynamic step caused by the composite material forming error and ensure a continuous and smooth shape. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the overall structure of the air intake and engine mounting connection structure provided by this utility model.

[0014] Figure 2 This is a schematic diagram of the overall unfolded structure provided by this utility model.

[0015] Figure 3This is a schematic diagram of the connector structure provided by this utility model.

[0016] Figure 4 This is a schematic diagram of the sealing ring structure provided by this utility model.

[0017] Figure 5 This is a cross-sectional schematic diagram of the assembly structure provided by this utility model.

[0018] In the diagram: 1. Metal pipe; 11. Connecting ring; 12. First connecting hole; 13. Convex ring; 14. Arc-shaped segment; 2. Air inlet pipe; 3. Seal; 31. Ring plate; 32. Rubber ring; 4. Connecting seat; 41. Connecting block; 42. Triangular reinforcing rib; 43. Ear plate; 44. Second connecting hole. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] like Figures 1 to 5 The diagram shows an intake manifold and engine mounting connection structure, including a metal pipe 1, which is installed between an intake pipe 2 and an engine. A connecting ring 11 is provided on the outer side of the metal pipe 1, and the connecting ring 11 is correspondingly provided with the intake pipe 2. A first connecting hole 12 is provided on the connecting ring 11. A sealing element 3 is provided between the metal pipe 1 and the intake pipe 2. A connecting seat 4 is provided on the metal pipe 1. The connecting seat 4 and the connecting ring 11 form a claw structure for limiting the sealing element 3 and engaging the intake pipe 2.

[0021] It should be noted that the advantages of this application are as follows: First, the composite material is easily deformed by temperature and pressure during the curing process, which leads to deviation of the positioning hole position; while the metal tube 1 can ensure the hole position accuracy through precision machining, serving as an "intermediate reference" between the composite material and the engine to compensate for the manufacturing error of the composite material. Metal tube 1 can serve as a rigid support during the assembly process, and can be directly aligned with the engine flange through tooling to avoid positioning displacement caused by the flexibility of the composite material. Secondly, the composite air intake may have uneven mating surfaces due to ply deformation or curing shrinkage, while the metal tube 1 can be adjusted to maintain a smooth and continuous aerodynamic shape through subsequent machining, thereby reducing turbulence or resistance caused by step differences. The coefficient of thermal expansion of metal tube 1 is between that of composite material and engine metal, which can partially absorb the deformation difference between the two caused by temperature difference and reduce the magnitude of step change with temperature. Finally, metal tube 1 can withstand higher bolt preload, preventing delamination in the composite connection area due to stress concentration; It can also be designed as an insulating transition structure to block the electrochemical corrosion path between the composite material and the engine.

[0022] Furthermore, by adding a metal tube 1 transition section between the composite intake pipe 2 and the engine, the assembly accuracy and aerodynamic performance are improved. The connecting ring 11 on the outside of the metal tube 1 is precisely connected to the intake pipe 2 through the first connecting hole 12. The precision-machined hole position compensates for the positioning deviation caused by the curing deformation of the composite material, while the rigid structure avoids the assembly offset caused by the flexibility of the composite material. The claw structure formed by the connecting seat 4 and the connecting ring 11, together with the sealing element 3, ensures the airtightness of the mating surface. The metal tube 1 can be machined and trimmed later to eliminate the aerodynamic step difference caused by the composite molding error and ensure the continuous and smooth shape. In addition, the thermal expansion coefficient of the metal tube 1 is between that of the composite material and the engine metal, which effectively alleviates the temperature difference deformation difference; its high rigidity can withstand greater bolt preload, prevent composite material delamination, and block electrochemical corrosion through insulation design.

[0023] Specifically, a convex ring 13 is provided on the metal pipe 1. The inner diameter of the convex ring 13 is the same as that of the air intake pipe 2. An arc-shaped section 14 is provided between the convex ring 13 and the connecting ring 11. The arc-shaped section 14 fits with the sealing element 3. The connecting seat 4 includes a connecting block 41. A triangular reinforcing rib 42 is provided between the connecting block 41 and the connecting ring 11. An ear piece 43 is provided on the connecting block 41. A second connecting hole 44 is opened on the ear piece 43.

[0024] Furthermore, the inner diameter of the convex ring 13 is precisely matched with the intake pipe 2 to ensure a smooth transition of the airflow channel and reduce turbulence loss. The arc-shaped section 14 fits tightly with the seal 3 to form a reliable flexible sealing interface, effectively preventing high-pressure airflow leakage. The triangular reinforcing rib 42 between the connecting block 41 and the connecting ring 11 greatly enhances the overall rigidity of the metal pipe 1, which can withstand the dynamic load caused by engine vibration and airflow pulsation, and avoid structural deformation. In addition, the elastic deformation capability of the arc segment 14 can compensate for the assembly tolerance between the composite material and the metal, while the limiting function of the convex ring 13 further ensures that the seal 3 does not shift under thermal cycling conditions, thus possessing high rigidity, high sealing capability and assembly tolerance.

[0025] Specifically, an installation area is formed between the connecting block 41, the connecting ring 11 and the boss. The ring plate 31 is set in the installation area and fits with the connecting ring 11. The sealing element 3 includes the ring plate 31. A rubber ring 32 is integrally formed on the ring plate 31 and contacts the arc segment 14.

[0026] Furthermore, the mounting area formed by the connecting block 41, the connecting ring 11, and the boss provides a stable positioning space for the ring plate 31, ensuring that the sealing assembly remains precisely aligned during assembly. The ring 31 fits tightly with the connecting ring 11 to form a rigid support surface, while the integrated rubber ring 32 makes full contact with the arc segment 14 through elastic deformation, which not only ensures the sealing performance under high pressure, but also adapts to the thermal expansion difference between the composite material and the metal. The flexibility of the rubber ring 32 can effectively absorb the dynamic load caused by engine vibration and airflow pulsation, reducing the risk of structural fatigue. At the same time, the integrated design avoids the assembly complexity of traditional split seals 3, reducing the number of parts and maintenance costs.

[0027] Specifically, there are multiple connecting seats 4, which are arranged in a circle, and the connecting block 41 is engaged with the air intake pipe 2.

[0028] Furthermore, by setting multiple circumferentially distributed connecting seats 4, the connection rigidity and load uniformity between the air intake and the engine are improved, forming a stable multi-point support structure, effectively dispersing engine vibration and aerodynamic load, and avoiding damage to the composite material caused by local stress concentration. The snap-fit ​​design between the connecting block 41 and the intake pipe 2 enables rapid and precise assembly, while enhancing the radial constraint force to prevent the connection from loosening under the impact of high-pressure airflow. It also adaptively compensates for any minor deformation that may exist in the composite intake duct, ensuring that the seal 3 is uniformly pressurized and maintaining long-term airtightness.

[0029] In summary: By adding a precision-machined metal tube 1 transition section between the composite air intake and the engine, the positioning deviation problem caused by the curing deformation of the composite is solved. The metal tube 1 serves as a rigid intermediate reference, and its high-precision hole positions compensate for the manufacturing error of the composite. The claw structure and snap-fit ​​design enable rapid and accurate assembly. The triangular reinforcing ribs 42 and the circumferentially distributed connecting seats 4 work together to form a stable multi-point rigid support, dispersing vibration and aerodynamic loads and avoiding composite delamination or stress concentration. At the same time, the thermal expansion coefficient of the metal tube 1 is between that of the composite and the engine metal, which significantly reduces the impact of temperature difference deformation on airtightness.

[0030] The convex ring 13 and arc-shaped section 14 of the metal tube 1 are designed to be combined with an integrated rubber ring 32 seal 3 to form a sealing interface. The elastic fit of the arc-shaped section 14 and the rubber ring 32 adapts to the assembly tolerance of the composite material and the metal, and maintains a stable seal under high pressure. The inner diameter of the convex ring 13 is precisely matched with the air inlet pipe 2 to ensure a smooth airflow transition and reduce turbulence loss. The ability of the metal tube 1 to be machined later eliminates the aerodynamic step caused by the composite material forming error and ensures a continuous and smooth shape.

[0031] The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. An intake manifold and engine mounting connection structure, comprising a metal pipe (1), characterized in that: The metal tube (1) is installed between the intake pipe (2) and the engine. A connecting ring (11) is provided on the outside of the metal tube (1). The connecting ring (11) is correspondingly provided with the intake pipe (2). A first connecting hole (12) is provided on the connecting ring (11). A sealing element (3) is provided between the metal tube (1) and the intake pipe (2). A connecting seat (4) is provided on the metal tube (1). The connecting seat (4) and the connecting ring (11) form a claw structure for limiting the sealing element (3) and engaging the intake pipe (2).

2. The intake manifold and engine mounting connection structure according to claim 1, characterized in that: The metal tube (1) is provided with a convex ring (13), the inner diameter of which is the same as that of the air inlet pipe (2), and an arc-shaped section (14) is provided between the convex ring (13) and the connecting ring (11), and the arc-shaped section (14) fits against the sealing element (3).

3. The intake manifold and engine mounting connection structure according to claim 1, characterized in that: The sealing element (3) includes a ring (31) on which a rubber ring (32) is integrally formed, and the rubber ring (32) contacts the arc segment (14).

4. The intake manifold and engine mounting connection structure according to claim 3, characterized in that: The connecting seat (4) includes a connecting block (41), a triangular reinforcing rib (42) is provided between the connecting block (41) and the connecting ring (11), an ear piece (43) is provided on the connecting block (41), and a second connecting hole (44) is opened on the ear piece (43).

5. The intake manifold and engine mounting connection structure according to claim 4, characterized in that: An installation area is formed between the connecting block (41), the connecting ring (11) and the boss, and the ring piece (31) is disposed in the installation area and fits against the connecting ring (11).

6. The intake manifold and engine mounting connection structure according to claim 5, characterized in that: The number of the connecting seats (4) is multiple, and the multiple connecting seats (4) are distributed in a circle. The connecting block (41) is fastened to the air intake pipe (2).

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