Installation Structure and Installation Method of Oil Pipe for Bearing Housing of Turbofan Engine

Abstract

The present invention discloses an installation structure and installation method for the oil pipe of a turbofan engine bearing housing, belonging to the technical field of turbofan engines. The installation structure of the oil pipe of the turbofan engine bearing housing includes an outer casing, an inner casing, a transition section and a bearing housing. The bearing housing is connected with an oil pipe for oil inlet and oil return. The oil pipe sequentially passes through the outer casing, the inner casing and the transition section and is connected with the bearing housing. The oil pipe includes an upper oil pipe and a lower oil pipe which are connected and conduct. The upper oil pipe is located in the cavity between the outer casing and the inner casing and is used for connecting the external oil circuit. The lower oil pipe is located in the cavity of the inner casing and the transition section and is used for connecting with the bearing housing. The connection part of the upper oil pipe and the lower oil pipe is located on the casing of the inner casing, and a sealing component for sealing the joint of the upper oil pipe and the lower oil pipe is arranged on the casing of the inner casing. This application can solve the technical problems that the processing difficulty of the oil inlet and oil return pipes of the bearing housing is large, and the assembly accuracy requirement with the casing is high, resulting in a high cost.

Description

Technical Field

[0001] The present invention relates to the technical field of turbofan engines, and specifically to an installation structure and installation method for the oil pipes of the bearing housing of a turbofan engine. Background Art

[0002] In the design and manufacturing process of a turbofan engine, the inlet and return oil pipes of the bearing housing, as important transmission channels, need to be connected to the high-pressure bearing housing through the inner and outer casings and the transition section. A turbofan engine usually includes two layers, namely an inner casing and an outer casing. The inlet and return oil pipes must pass through these two casings, the transition section and be assembled with the high-pressure bearing housing. Due to the complexity of this multi-layer structure, the assembly requirements for the inlet and return oil pipes of the bearing housing are extremely high, and precise control of position tolerances and assembly accuracy is required. Because there is a concern that adding connection structures will result in more joint surfaces and potential leakage points. For example, if a flange connection is used for multiple sections of oil pipes, the flange connection structure is prone to leakage risks. Therefore, in the traditional design of the bearing housing of a turbofan engine, a whole oil pipe is generally used to span each casing layer and directly connect to the bearing housing.

[0003] This assembly connection method poses multiple challenges. First of all, due to the hollow and slender structure of the inlet and return oil pipes of the bearing housing, their rigidity is poor and they are prone to deformation during the processing and assembly processes, resulting in the coaxiality being difficult to meet the design requirements. In addition, the inlet and return oil pipes need to pass through the inner and outer casings and the transition section, and the connection between each casing layer requires high-precision assembly tolerances. This poses extremely high requirements for the assembly process and increases the complexity during the production process. In order to ensure that the inlet and return oil pipes of the bearing housing can be smoothly docked with each casing layer and the transition section, it is necessary to precisely control the position and tolerances between each casing layer to ensure that each connection point meets the design standards. However, this complex assembly method not only significantly increases the production cost, but also increases the difficulty and error rate during the assembly process. Due to the very strict tolerance requirements, any minor error may lead to assembly failure, thus affecting the overall performance and reliability of the engine.

[0004] In addition, the complex assembly process also leads to a long production cycle and high technical requirements, and requires a large amount of process verification and quality control. Manufacturers need to invest more resources to ensure the assembly accuracy and avoid assembly defects or sealing problems caused by position errors, thereby further increasing the production cost.

[0005] Therefore, how to simplify the assembly process of the inlet and return oil pipes of the bearing housing, reduce the production cost, and improve the assembly reliability while ensuring the assembly accuracy and position tolerances has become an important technical problem to be urgently solved in the design of turbofan engines. Summary of the Invention

[0006] The present invention provides an installation structure and installation method for oil pipes of a bearing housing of a turbofan engine, so as to solve the technical problems of high processing difficulty of the inlet and return oil pipes of the bearing housing and high assembly accuracy requirements with the casing, resulting in high costs.

[0007] According to one aspect of the present invention, there is provided an installation structure for oil pipes of a bearing housing of a turbofan engine, including an outer casing, an inner casing, a transition section and a bearing housing. The bearing housing is connected with oil pipes for oil inlet and oil return. The oil pipes sequentially pass through the outer casing, the inner casing and the transition section and are connected with the bearing housing.

[0008] The oil pipes include an upper oil pipe and a lower oil pipe which are connected and conduct. The upper oil pipe is located in the cavity between the outer casing and the inner casing and is used to connect the external oil circuit. The lower oil pipe is located in the cavity of the inner casing and the transition section and is used to connect with the bearing housing. The connection part of the upper oil pipe and the lower oil pipe is located on the casing of the inner casing, and a sealing component for sealing the joint of the upper oil pipe and the lower oil pipe is arranged on the casing of the inner casing.

[0009] Optionally, the sealing component includes a sealing cover arranged on the casing of the inner casing. A sealing sleeve is arranged in the sealing cover. The sealing sleeve is sleeved on the lower oil pipe. The outer contour of the lower end of the sealing sleeve is a conical surface whose diameter decreases from top to bottom. A conical groove matching the outer contour of the lower end of the sealing sleeve is arranged on the sealing cover. The bottom end of the upper oil pipe abuts against the upper end of the sealing sleeve, pressing the sealing sleeve tightly on the sealing cover.

[0010] Optionally, the outer contour of the upper end of the sealing sleeve is a conical surface whose diameter increases from top to bottom. A connecting sleeve is arranged at the bottom end of the upper oil pipe. The connecting sleeve is sleeved on the top end of the sealing sleeve, and the inner wall of the connecting sleeve is a conical surface matching the outer contour of the top end of the sealing sleeve.

[0011] Optionally, the connecting sleeve and the upper oil pipe are integrally formed. The upper end of the lower oil pipe extends into the connecting sleeve and fits with the lower end face of the upper oil pipe.

[0012] Optionally, an installation seat is arranged at the top end of the upper oil pipe. The installation seat is fixedly connected with the outer casing through bolts.

[0013] Optionally, an oil pipe connection hole is arranged in the bearing housing. The lower end of the lower oil pipe is inserted into the oil pipe connection hole.

[0014] Optionally, an asbestos gasket is arranged at the bottom of the connection hole. The lower end face of the lower oil pipe is tightly pressed on the asbestos gasket.

[0015] Optionally, the sealing cover includes a positioning section located in the cavity of the outer casing and a sealing section located in the cavity of the inner casing. The upper end of the positioning section has an opening for the upper oil pipe to be inserted. The lower end of the positioning section communicates with the sealing section. The conical groove of the sealing cover is arranged on the sealing section.

[0016] According to another aspect of the present invention, there is also provided a method for installing an oil pipe of a turbofan engine bearing housing, which includes the following steps:

[0017] S100, assemble the seal sleeve and the lower oil pipe, and make the seal sleeve located at the upper end of the lower oil pipe;

[0018] S200, install the lower oil pipe, insert the lower oil pipe through the inner casing and the transition section into the oil pipe connection hole, and make the seal sleeve located in the seal cover on the inner casing;

[0019] S300, assemble the outer casing;

[0020] S400, install the upper oil pipe, insert the upper oil pipe into the outer casing, and make the lower end of the upper oil pipe extend into the seal cover to be butted against the lower oil pipe;

[0021] S500, lock the upper oil pipe, fix the upper end of the upper oil pipe on the outer casing through bolts. Under the pressing of the bolts, the upper oil pipe has a downward extrusion force, so that the connecting sleeve is closely attached to the conical surface at the top of the seal sleeve, and the seal sleeve is pressed, so that the seal cover is closely attached to the conical surface at the bottom of the seal sleeve.

[0022] Optionally, before installing the lower oil pipe, install an asbestos gasket in the oil pipe connection hole;

[0023] In the step of locking the upper oil pipe, the extrusion force of the upper oil pipe acts on the asbestos gasket through the lower oil pipe, so that the asbestos gasket generates a preset deformation compression amount.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] In the present invention, the oil pipe is divided into an upper oil pipe and a lower oil pipe. The upper oil pipe is located in the cavity between the outer casing and the inner casing, and the lower oil pipe is located in the cavity of the inner casing and the transition section. Such a design effectively reduces the length-diameter ratio of the oil pipe, reduces the risk of deformation during the processing, and reduces the requirement for coaxiality, making the processing easier and the accuracy easier to control.

[0026] In addition, the connection part of the upper oil pipe and the lower oil pipe of the oil pipe is located on the casing of the inner casing, and a sealing component for sealing the oil pipe joint is arranged on the casing of the inner casing. Through reasonable cooperation of these sealing components, the sealing effect of the oil pipe connection part is ensured, and the common sealing defect problem in the traditional design is avoided. The design of the sealing component improves the flexibility of the assembly, reduces the requirement for the assembly accuracy, and thus reduces the assembly difficulty and cost caused by the accuracy problem.

[0027] In traditional designs, the inlet and return oil pipes of the bearing housing need to pass through multiple casings, and the connection requirements between each casing are very precise, increasing the difficulty of processing and assembly. Moreover, due to the axial deformation mismatch of the inner and outer casings caused by temperature differences, shear stress is easily generated, leading to deformation. Through the design of the present invention, the segmented structure of the oil pipe reduces the rigidity problem of the pipeline, avoids the connection problems between multiple casings, and at the same time, through the sealing effect of the sealing component, reduces the influence of the axial deformation mismatch between the inner and outer casings, greatly reducing the requirements for processing accuracy and assembly accuracy. Generally speaking, through structural optimization and sealing design, the present invention reduces the processing difficulty, reduces the cost, and improves the assemblability and reliability at the same time.

[0028] Different from the conventional technical conceptions, the present invention reversely splits the oil pipe and sets self-adaptive sealing structures such as sealing sleeves at the intermediate connection to actively utilize the segmented transition of the upper and lower oil pipes to buffer the problem of inconsistent axial deformations of the outer casing and the transition section, etc. After the accumulated tolerances and installation errors of a single oil pipe between multiple casings are reduced, the requirements for processing and assembly accuracy can be significantly reduced; reducing heat deformation transmission: Since after segmentation, the temperature difference deformation between the outer casing and the bearing housing is "divided" at the inner casing and flexibly compensated through the double-cone surface fit of the sealing sleeve, so that the thermal stress does not transfer along the entire oil pipe, reducing the damage of deformation to the seal; enhancing seal reliability: The bolt tightening force of the upper oil pipe is transmitted to the sealing sleeve to achieve bidirectional pressing of the upper and lower end conical surfaces of the sealing sleeve, and then combined with the elastic buffering of the asbestos gasket, it can maintain effective sealing for a long time under harsh working conditions such as high temperature, high pressure, and vibration.

[0029] Moreover, the present invention does not simply divide the oil pipe into multiple segments and fixedly connect them, but reasonably sets the connection position at the inner casing and cooperates with a special sealing component to make it take into account the stiffness improvement brought by segmentation and the seal enhancement brought by the double-cone surface self-adaptive compensation. This solution segments at the inner casing: The upper and lower oil pipes are respectively in the shorter spans of the outer casing - inner casing and the inner casing - transition section, which is easier to process and manufacture and improves the assembly coaxiality; double-cone surface + sealing cover: realizes the axial extrusion and self-adaptive fit of the upper and lower oil pipes to the sealing sleeve, meeting the sealing under a wide working temperature range; elastic compression of the asbestos gasket: absorbs the fine displacement of the end of the lower oil pipe under high temperature and vibration and further protects against the risk of bearing housing oil leakage. Through the combination of the above elements, the present invention overcomes the prejudices of the prior art and solves the problems of high processing difficulty of the inlet and return oil pipes of the bearing housing and high requirements for assembly accuracy with the casing, resulting in high costs.

[0030] In addition to the purposes, features, and advantages described above, the present invention has other purposes, features, and advantages. The following will refer to the drawings for a further detailed description of the present invention. Description of the Drawings

[0031] The accompanying drawings, which form a part of this application, are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0032] Figure 1 It is a schematic diagram of the oil pipe installation structure of the bearing housing of the turbofan engine of the present invention;

[0033] Figure 2 It is a schematic diagram of the structure of the seal housing of the present invention;

[0034] Figure 3 It is a schematic diagram of the structure of the asbestos gasket of the present invention.

[0035] Legend:

[0036] 1. Upper oil pipe; 2. Lower oil pipe; 3. Outer casing; 4. Inner casing; 5. Transition section; 6. Seal housing; 7. Bearing housing; 8. Low-pressure bearing housing; 9. Asbestos gasket. Specific embodiments

[0037] The following will describe the embodiments of the present invention in detail with reference to the accompanying drawings. However, the present invention can be implemented in many different ways defined and covered by the following.

[0038] The following combines the attached Figures 1-3 This application will be further described in detail.

[0039] The embodiments of this application disclose a turbofan engine bearing housing oil pipe installation structure and installation method.

[0040] Refer to Figure 1 , the oil pipe installation structure of the bearing housing 7 of the turbofan engine includes an outer casing 3, an inner casing 4, a transition section 5 and a bearing housing 7. The bearing housing 7 is connected with an oil pipe for oil inlet and return. The oil pipe sequentially passes through the outer casing 3, the inner casing 4 and the transition section 5 and is connected with the bearing housing 7; the oil pipe includes an upper oil pipe 1 and a lower oil pipe 2 which are connected and conduct. The upper oil pipe 1 is located in the cavity between the outer casing 3 and the inner casing 4 and is used to connect the external oil circuit; the lower oil pipe 2 is located in the cavity of the inner casing 4 and the transition section 5 and is used to connect with the bearing housing 7; the connection part of the upper oil pipe 1 and the lower oil pipe 2 is located on the casing of the inner casing 4, and a sealing component for sealing the joint of the upper oil pipe 1 and the lower oil pipe 2 is arranged on the casing of the inner casing 4.

[0041] The oil pipe installation structure of the bearing housing 7 of the turbofan engine includes an inlet oil pipe and a return oil pipe, and each oil pipe is composed of an upper oil pipe 1 and a lower oil pipe 2 respectively. The upper oil pipe 1 of the inlet oil pipe is located in the cavity between the outer casing 3 and the inner casing 4, and is responsible for connecting the external oil circuit and transporting the oil fluid to the bearing housing 7; the lower oil pipe 2 of the return oil pipe is located in the cavity between the inner casing 4 and the transition section 5, and is responsible for guiding the return oil fluid passing through the bearing back to the system. The upper oil pipe 1 and the lower oil pipe 2 are connected through the casing of the inner casing 4, and a sealing component is provided at the connection part to prevent the leakage of oil fluid or gas at the joint of the two oil pipes. Through this design, the layout of the oil pipes not only optimizes the flow paths of the inlet oil and the return oil, but also effectively improves the sealing performance and the assembly performance of the system. During the installation process, the oil pipes are smoothly connected through the cavities of the outer casing 3, the inner casing 4 and the transition section 5, and the sealing component ensures the sealing of the oil pipe joints through reasonable cooperation, avoiding the risk of oil fluid and gas leakage. At the same time, this segmented design reduces the length-diameter ratio of the oil pipes, reduces the risk of deformation during processing, and simplifies the control of coaxiality, significantly reducing the processing difficulty. Due to the relatively simple design and good rigidity of the oil pipes, the coaxiality problems caused by poor rigidity and deformation of the traditional oil pipes are avoided, and the high requirements for assembly accuracy are also reduced, thereby reducing the assembly difficulty and the manufacturing cost. In addition, the sealing component of the inner casing 4 effectively reduces the influence of the axial deformation mismatch caused by the temperature difference on the oil pipes, further improving the stability and reliability of the entire oil pipe system.

[0042] Refer to Figure 2, the sealing assembly includes a sealing cover disposed on the casing of the inner casing 4. A sealing sleeve 6 is arranged inside the sealing cover. The sealing sleeve 6 is sleeved on the lower oil pipe 2. The outer contour of the lower end of the sealing sleeve 6 is a conical surface whose diameter decreases from top to bottom. A conical groove matching the outer contour of the lower end of the sealing sleeve 6 is provided on the sealing cover. The bottom end of the upper oil pipe 1 abuts against the upper end of the sealing sleeve 6, pressing the sealing sleeve 6 tightly against the sealing cover. Specifically, the sealing cover is arranged on the casing of the inner casing 4, and the sealing sleeve 6 is installed inside the sealing cover. The sealing sleeve 6 is sleeved on the upper part of the lower oil pipe 2. The sealing sleeve 6 is designed with a certain conical structure, where the diameter of the outer contour of the lower end gradually decreases from top to bottom, forming a conical surface shape. A conical groove matching the outer contour of the lower end of the sealing sleeve 6 is also designed on the sealing cover. During installation, the bottom end of the upper oil pipe 1 is in close contact with the upper end of the sealing sleeve 6, so that the sealing sleeve 6 is fixed on the sealing cover through pressing, ensuring that the sealing sleeve 6 can form an effective seal at the connection part. The conical fit between the sealing sleeve 6 and the sealing cover is the core of the sealing design. Through this structure, the conical outer contour of the sealing sleeve 6 matches the groove of the sealing cover, achieving a tight fit during installation and effectively preventing oil leakage. This conical sealing design not only improves the sealing performance of the connection, but also can adapt to the small deformations caused by different temperature changes during the connection of the inlet pipe and the return pipe of the bearing housing 7 oil pipe, ensuring the sealing effect during long-term operation.

[0043] The outer contour of the upper end of the sealing sleeve 6 is a conical surface whose diameter increases from top to bottom. A connecting sleeve is provided at the bottom end of the upper oil pipe 1. The connecting sleeve is sleeved on the top end of the sealing sleeve 6, and the inner wall of the connecting sleeve is a conical surface matching the outer contour of the top end of the sealing sleeve 6. The connecting sleeve is installed at the bottom end of the upper oil pipe 1 and sleeved on the top end of the sealing sleeve 6. The inner wall of the connecting sleeve is designed as a conical surface matching the outer contour of the top end of the sealing sleeve 6. Such a conical fit can tightly combine the connecting sleeve and the sealing sleeve 6 during installation, ensuring a good sealing effect between the two.

[0044] The seal housing 6 as a whole presents a kidney-shaped structure and includes two conical surfaces. Specifically, the outer contour of the lower end of the seal housing 6 is a conical surface with a diameter decreasing from top to bottom, while the outer contour of the upper end is a conical surface with a diameter gradually increasing from top to bottom. Such a kidney-shaped design enables the seal housing 6 to form a tight fit with the seal cover and the connecting sleeve at both ends respectively. When a downward acting force is generated on the upper oil pipe 1 by the seal housing 6 with such a kidney-shaped structure, a stronger sealing effect will be exerted. Since the seal housing 6 is composed of two conical surfaces, when the bottom end of the upper oil pipe 1 is in close contact with the connecting sleeve and applies a downward extrusion force, this force acts not only on the upper conical surface of the seal housing 6, but also is transmitted to the lower conical surface through the entire structure. As a result, both conical surfaces of the seal housing 6 will be squeezed, causing the seal housing 6 to deform. This deformation causes the outer surface of the seal housing 6 to fit more closely to the sealing surfaces in contact therewith, including the conical groove of the seal cover and the conical inner wall of the connecting sleeve. Through this double extrusion and deformation, the sealing performance of the seal housing 6 is significantly improved, thus effectively preventing oil leakage or gas leakage. The design of this structure can adaptively change and maintain good sealing performance in a high-pressure or high-temperature working environment. Especially during long-term operation, it can cope with the minute deformations caused by temperature difference and pressure fluctuations, ensuring that the sealing effect is lasting and stable.

[0045] The seal cover includes a positioning section located in the cavity of the outer casing 3 and a sealing section located in the cavity of the inner casing 4. The upper end of the positioning section has an opening for the upper oil pipe 1 to be inserted. The lower end of the positioning section is in communication with the sealing section. The conical groove of the seal cover is arranged in the sealing section. The seal cover is divided into two parts: the positioning section located in the cavity of the outer casing 3 and the sealing section located in the cavity of the inner casing 4. An opening is provided at the upper end of the positioning section so that the upper oil pipe 1 can be smoothly inserted. This design provides an accurate guide for the installation of the upper oil pipe 1. The positioning section ensures that the upper oil pipe 1 can maintain the correct position when passing through the outer casing 3, thus avoiding possible deviation or misalignment during the installation process. The lower end of the positioning section is in communication with the sealing section, making the entire seal cover form a continuous structure and providing a stable passage. A conical groove is arranged in the sealing section, which matches the outer contour of the lower end of the seal housing 6, further enhancing the sealing effect. When the seal housing 6 is installed in the seal cover, the conical groove can ensure a tight fit between the lower end of the seal housing 6 and the seal cover, effectively preventing oil leakage. Through this structural design, the seal cover can not only provide accurate positioning for the upper oil pipe 1, but also ensure the sealing and stability of the oil pipe connection

[0046] The connecting sleeve and the upper oil pipe 1 are integrally formed. The upper end of the lower oil pipe 2 extends into the connecting sleeve and fits against the lower end face of the upper oil pipe 1. The overall integrated design of the connecting sleeve and the upper oil pipe 1 not only reduces the number of components but also avoids possible assembly errors or loosening problems at the connection part, enhancing the firmness and sealing performance of the connection. Structurally, this integrally formed design ensures a tight fit between the connecting sleeve and the upper oil pipe 1, effectively preventing leakage caused by improper assembly or gaps between components. In addition, the upper end of the lower oil pipe 2 extends into the connecting sleeve and fits tightly against the lower end face of the upper oil pipe 1. This connection method further optimizes the fluid path of the oil pipe, making the flow of oil more smooth and avoiding the risk of leakage at the possible seams. The tight fit between the upper oil pipe 1 and the lower oil pipe 2 can effectively prevent deformation caused by temperature or pressure changes from affecting the sealing effect, ensuring the stability of the oil pipe system.

[0047] An installation seat is provided at the top of the upper oil pipe 1, and the installation seat is fixedly connected to the outer casing 3 by bolts. The installation seat provides a stable connection point, enabling the upper oil pipe 1 to be reliably fixed to the outer casing 3. This structural design effectively prevents the oil pipe from loosening or displacing due to vibration or pressure changes during operation, ensuring that the oil pipe always maintains the correct position.

[0048] Refer to Figure 3 , the bearing housing 7 is used to support the high-pressure rotor, and the low-pressure bearing housing 8 is used to support the low-pressure rotor. An oil pipe connection hole is provided in the bearing housing 7, and the lower end of the lower oil pipe 2 is inserted into the oil pipe connection hole. An asbestos gasket 9 is provided at the bottom of the connection hole, and the lower end face of the lower oil pipe 2 is tightly pressed against the asbestos gasket 9. The oil pipe connection hole provided in the bearing housing 7 provides an accurate insertion position for the lower oil pipe 2, ensuring a more stable and reliable connection between the lower oil pipe 2 and the bearing housing 7. The lower end of the lower oil pipe 2 is inserted into the connection hole, effectively connecting the oil fluid channel with the bearing housing 7 and ensuring the continuity and smoothness of the oil circuit system. Through this insertion method, it can be ensured that the oil pipe will not fall off or loosen due to vibration or external forces in the high-pressure and high-temperature operating environment, thus avoiding oil leakage or system failures. The setting of the asbestos gasket 9 further enhances the sealing performance. The asbestos gasket 9 has good high-temperature and pressure resistance properties, effectively resisting the risk of oil leakage. The presence of the asbestos gasket 9 enables the lower end face of the lower oil pipe 2 to form a uniform pressing effect when tightly pressed, ensuring the sealing performance between the lower oil pipe 2 and the oil pipe connection hole. Especially in a working environment with large temperature or pressure changes, the asbestos gasket 9 can provide sufficient elastic deformation, keeping the sealing performance at the joint in the best state and preventing oil leakage.

[0049] According to another aspect of the present invention, a method for installing an oil pipe of a turbofan engine bearing housing 7 is also provided, which includes the following steps:

[0050] S100, Assemble the seal sleeve 6 and the lower oil pipe 2 so that the seal sleeve 6 is located at the upper end of the lower oil pipe 2.

[0051] In step S100, the process of assembling the seal sleeve 6 and the lower oil pipe 2 first requires ensuring that the seal sleeve 6 is correctly installed at the upper end of the lower oil pipe 2. During the specific operation, first, the seal sleeve 6 is aligned with the top of the lower oil pipe 2. Usually, the seal sleeve 6 has precise dimensions and shapes so that it can be smoothly sleeved onto the upper end of the lower oil pipe 2. The inner diameter of the seal sleeve 6 usually matches the outer diameter of the lower oil pipe 2 to ensure that the seal sleeve 6 can be firmly fixed at the upper end part of the lower oil pipe 2. This process includes gently pushing or sliding the seal sleeve 6 into the upper end of the lower oil pipe 2 until the seal sleeve 6 is firmly positioned at the top of the lower oil pipe 2. To ensure the correct installation of the seal sleeve 6, tools may be needed or certain manual operations may be adopted, such as slightly squeezing or rotating to help the seal sleeve 6 be firmly installed on the lower oil pipe 2. During the installation process, attention also needs to be paid to the direction and position of the seal sleeve 6 to ensure that the conical surface at its lower end can adapt to the subsequent cooperation with the seal cover during assembly, avoiding problems such as misalignment or incomplete contact.

[0052] S200, Install the lower oil pipe 2. Insert the lower oil pipe 2 through the inner casing 4 and the transition section 5 into the oil pipe connection hole so that the seal sleeve 6 is located within the seal cover on the inner casing 4.

[0053] In step S200, the process of installing the lower oil pipe 2 first involves accurately inserting the lower oil pipe 2 through the inner casing 4 and the transition section 5. This operation needs to ensure that the lower oil pipe 2 can maintain its correct path and positioning when passing through these structures, avoiding affecting subsequent connection and sealing due to misalignment or non-alignment. During the installation process, the lower oil pipe 2 is first guided through the cavity of the inner casing 4, then through the transition section 5, and finally inserted into the oil pipe connection hole on the bearing housing 7.

[0054] During this process, the installation of the seal sleeve 6 is particularly crucial because it is located at the upper end of the lower oil pipe 2. As the lower oil pipe 2 is installed, the seal sleeve 6 is also brought into the seal cover within the inner casing 4. The seal cover has a specific shape and structural design, enabling the seal sleeve 6 to be smoothly positioned and held in place. The role of the seal cover is to ensure that the seal sleeve 6 is perfectly docked with the conical groove inside it, thus forming an efficient sealing interface to prevent oil or gas leakage.

[0055] S300, Assemble the outer casing 3.

[0056] S400, Install the upper oil pipe 1. Insert the upper oil pipe 1 into the outer casing 3 so that the lower end of the upper oil pipe 1 extends into the seal cover to dock with the lower oil pipe 2.

[0057] In step S400, the process of installing the upper oil pipe 1 first requires accurately guiding and inserting the upper oil pipe 1 into the outer casing 3. Next, the lower end of the upper oil pipe 1 needs to be inserted into the sealing cover and docked with the lower oil pipe 2. The conical groove designed inside the sealing cover matches the outer contour of the sealing sleeve 6 to ensure the preset position of the seal. When docking the upper oil pipe 1 with the lower oil pipe 2, special attention should be paid to whether the connection parts of the two are accurately aligned to ensure smooth transmission of the fluid and prevent leakage caused by poor contact or position deviation.

[0058] S500, lock the upper oil pipe 1, and fix the upper end of the upper oil pipe 1 on the outer casing 3 by bolts. Under the pressure of the bolts, the upper oil pipe 1 has a downward extrusion force, so that the connecting sleeve and the conical surface at the top of the sealing sleeve 6 fit tightly, and the sealing sleeve 6 is compressed so that the sealing cover and the conical surface at the bottom of the sealing sleeve 6 fit tightly.

[0059] In step S500, a mounting seat has been installed at the upper end of the upper oil pipe 1, and it is docked with the outer casing 3 through pre-set screw holes. Bolts firmly fix the upper oil pipe 1 on the outer casing 3 through these screw holes to ensure that its position is stable and not easy to loosen. During the process of tightening the bolts, a certain downward pressing force will be applied, and this force will be transmitted to the connection part of the lower oil pipe 2 through the upper oil pipe 1. Specifically, the pressing force of the bolts will make the connecting sleeve and the top conical surface of the sealing sleeve 6 closely contact, thereby achieving the compression of the sealing sleeve 6. After the sealing sleeve 6 is compressed, its two conical surfaces will produce appropriate deformation, so that the sealing sleeve 6 can fit more closely and seal its position. This deformation not only enhances the sealing effect, but also effectively resists the risk of leakage caused by temperature changes or pressure fluctuations. At the same time, the bottom conical surface of the sealing sleeve 6 will also be tightly matched with the conical groove of the sealing cover to form a double seal. Through this close fit, the contact surface between the sealing sleeve 6 and the sealing cover reduces the possibility of leakage, so that the entire oil pipe system has higher sealing performance and durability.

[0060] Before installing the lower oil pipe 2, install the asbestos gasket 9 into the oil pipe connection hole; in the step of tightening the upper oil pipe 1, the extrusion force of the upper oil pipe 1 acts on the asbestos gasket 9 through the lower oil pipe 2, causing the asbestos gasket 9 to generate a preset deformation compression amount. During the installation process, the asbestos gasket 9 is precisely placed at the bottom of the oil pipe connection hole to ensure that it can be in close contact with the lower end of the lower oil pipe 2 after the oil pipe is installed. When the lower oil pipe 2 is inserted into the oil pipe connection hole and contacts the asbestos gasket 9, the elasticity and adaptability of the asbestos gasket 9 enable it to be appropriately compressed and form a preliminary sealing effect. Subsequently, in the step of tightening the upper oil pipe 1, the bolt fixes its upper end to the outer casing 3 by pressing the upper oil pipe 1, and this process will generate a downward extrusion force. The extrusion force of the upper oil pipe 1 is transmitted to the asbestos gasket 9 through the lower oil pipe 2. After being squeezed, the asbestos gasket 9 will generate a preset deformation compression amount. This compression makes the asbestos gasket 9 fit more closely to the bottom of the oil pipe connection hole and form a more firm and reliable seal on the lower end face of the lower oil pipe 2. In this way, the deformation and compression of the asbestos gasket 9 help to further enhance the sealing effect and ensure that the oil does not leak at the oil pipe connection part.

[0061] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. The oil pipe installation structure of the turbofan engine bearing seat is characterized by: The invention comprises an outer casing (3), an inner casing (4), a transition section (5) and a bearing seat (7); the bearing seat (7) is connected with an oil pipe for oil inlet and oil return, and the oil pipe passes through the outer casing (3), the inner casing (4) and the transition section (5) in sequence and is connected with the bearing seat (7); the oil pipe comprises an upper oil pipe (1) and a lower oil pipe (2) which are connected and conducted; the upper oil pipe (1) is located in a cavity between the outer casing (3) and the inner casing (4) and is used for connecting an external oil circuit; the lower oil pipe (2) is located in a cavity between the inner casing (4) and the transition section (5) and is used for connecting with the bearing seat (7); the connection part between the upper oil pipe (1) and the lower oil pipe (2) is located on the casing body of the inner casing (4); and a sealing component for sealing the joint between the upper oil pipe (1) and the lower oil pipe (2) is provided on the casing body of the inner casing (4).

2. The turbofan engine bearing seat oil pipe installation structure according to claim 1, characterized in that: The sealing assembly comprises a sealing cover arranged on the casing body of the inner casing (4), a sealing sleeve (6) being arranged inside the sealing cover, the sealing sleeve (6) being sleeved on the lower oil pipe (2), the outer contour of the lower end of the sealing sleeve (6) being a conical surface whose diameter decreases from top to bottom, the sealing cover being provided with a conical groove matching the outer contour of the lower end of the sealing sleeve (6), the bottom end of the upper oil pipe (1) being in contact with the upper end of the sealing sleeve (6), and the sealing sleeve (6) being pressed against the sealing cover.

3. The turbofan engine bearing seat oil pipe installation structure according to claim 2 is characterized in that: The outer contour of the upper end of the sealing sleeve (6) is a conical surface with a diameter that gradually increases from top to bottom. The bottom end of the upper oil pipe (1) is provided with a connecting sleeve, which is arranged on the top end of the sealing sleeve (6), and the inner wall of the connecting sleeve is a conical surface that matches the outer contour of the top end of the sealing sleeve (6).

4. The turbofan engine bearing seat oil pipe installation structure according to claim 3 is characterized in that: The connecting sleeve and the upper oil pipe (1) are integrally formed, and the upper end of the lower oil pipe (2) extends into the connecting sleeve and fits with the lower end surface of the upper oil pipe (1).

5. The turbofan engine bearing seat oil pipe installation structure according to claim 1, characterized in that: A mounting seat is provided at the top end of the upper oil pipe (1), and the mounting seat is fixedly connected to the outer culvert casing (3) by bolts.

6. The turbofan engine bearing seat oil pipe installation structure according to claim 3, characterized in that: An oil pipe connection hole is provided in the bearing seat (7), and the lower end of the lower oil pipe (2) is inserted into the oil pipe connection hole.

7. The turbofan engine bearing seat oil pipe installation structure according to claim 6, characterized in that: An asbestos pad (9) is arranged at the bottom of the connecting hole, and the lower end surface of the lower oil pipe (2) is tightly pressed against the asbestos pad (9).

8. The turbofan engine bearing seat oil pipe installation structure according to claim 3, characterized in that: The sealing cover comprises a positioning section located in the cavity of the outer casing (3) and a sealing section located in the cavity of the inner casing (4), the upper end of the positioning section has an opening for the upper oil pipe (1) to be inserted, the lower end of the positioning section is connected to the sealing section, and the conical groove of the sealing cover is arranged in the sealing section.

9. A method for installing an oil pipe in a turbofan engine bearing seat, using the turbofan engine bearing seat oil pipe installation structure according to any one of claims 3, 4, 6, and 8, characterized in that: The steps include: S100, assembling the sealing sleeve (6) and the lower oil pipe (2) so that the sealing sleeve (6) is located at the upper end of the lower oil pipe (2); S200, installing the lower oil pipe (2), passing the lower oil pipe (2) through the inner casing (4) and the transition section (5) and inserting it into the oil pipe connection hole, so that the sealing sleeve (6) is located in the sealing cover on the inner casing (4); S300, assembling the outer casing (3); S400, installing the upper oil pipe (1), inserting the upper oil pipe (1) into the outer casing (3), so that the lower end of the upper oil pipe (1) extends into the sealing cover and docks with the lower oil pipe (2); S500, lock the upper oil pipe (1), and fix the upper end of the upper oil pipe (1) to the outer casing (3) by bolts. Under the pressure of the bolts, the upper oil pipe (1) has a downward extrusion force, so that the connecting sleeve and the conical surface at the top of the sealing sleeve (6) fit tightly, and the sealing sleeve (6) is pressed, so that the sealing cover and the conical surface at the bottom of the sealing sleeve (6) fit tightly.

10. The method for installing the oil pipe of a turbofan engine bearing seat according to claim 9, characterized in that: Before installing the lower oil pipe (2), install the asbestos pad (9) in the oil pipe connection hole; In the step of locking the upper oil pipe (1), the squeezing force of the upper oil pipe (1) acts on the asbestos pad (9) through the lower oil pipe (2), causing the asbestos pad (9) to produce a preset deformation compression amount.

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