Turbofan engine bearing seat oil pipe installation structure and installation method

Abstract

The invention discloses a turbofan engine bearing seat oil pipe installation structure and an installation method, and belongs to the technical field of turbofan engines, the turbofan engine bearing seat oil pipe installation structure comprises an outer culvert casing, an inner culvert casing, a transition section and a bearing seat, the bearing seat is connected with an oil pipe used for oil inlet and oil return, and the oil pipe is connected with an oil pipe. The oil pipe sequentially penetrates through the outer culvert casing, the inner culvert casing and the transition section to be connected with the bearing seat; the oil pipe comprises an upper oil pipe and a lower oil pipe which are connected and communicated, and the upper oil pipe is located in a cavity between the outer culvert casing and the inner culvert casing and used for being connected with an external oil way; the lower oil pipe is located in a cavity of the inner box and the transition section and used for being connected with a bearing seat. The connecting portion of the upper oil pipe and the lower oil pipe is located on a box body of the inner box, and the box body of the inner box is provided with a sealing assembly used for sealing a joint between the upper oil pipe and the lower oil pipe. The technical problems that the machining difficulty of the oil inlet pipe and the oil return pipe of the bearing seat is large, and the cost is high due to the high assembling precision requirement of the casing can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of turbofan engines, and in particular to a turbofan engine bearing seat oil pipe installation structure and an installation method. Background Art

[0002] During the design and manufacturing process of turbofan engines, the oil inlet and return pipes of the bearing seat serve as important transmission channels and need to be connected to the high-pressure bearing seat through the inner and outer casings and the transition section. Turbofan engines usually include two layers, the inner casing and the outer casing. The oil inlet and return pipes must pass through these two layers of casings, the transition section and be assembled with the high-pressure bearing seat. Due to the complexity of this multi-layer structure, the assembly requirements of the oil inlet and return pipes of the bearing seat are extremely high, and the position tolerance and assembly accuracy need to be precisely controlled. Because of the concern that adding a connection structure will create more joint surfaces and potential leakage points, for example, if flanges are used to connect multiple sections of oil pipes, the flange connection structure is prone to leakage risks. Therefore, in the traditional design of the turbofan engine bearing seat, a whole oil pipe is generally used to cross each casing layer and directly connect to the bearing seat.

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

[0004] In addition, the complex assembly process will also lead to long production cycles and high technical requirements, requiring a lot of process verification and quality control. Manufacturers need to invest more resources to ensure assembly accuracy and avoid poor assembly or sealing problems caused by position errors, which further increases production costs.

[0005] Therefore, how to simplify the assembly process of the bearing seat inlet and return oil pipes while ensuring assembly accuracy and position tolerance, reduce production costs, and improve assembly reliability has become an important technical issue that needs to be urgently solved in the design of turbofan engines. Summary of the invention

[0006] The present invention provides a turbofan engine bearing seat oil pipe installation structure and installation method, so as to solve the technical problems that the bearing seat oil inlet and return pipes are difficult to process and the assembly accuracy requirements with the casing are high, resulting in high costs.

[0007] According to one aspect of the present invention, there is provided a turbofan engine bearing seat oil pipe installation structure, comprising an outer casing, an inner casing, a transition section and a bearing seat, the bearing seat is connected with an oil pipe for oil inlet and oil return, and the oil pipe passes through the outer casing, the inner casing and the transition section in sequence and is connected to the bearing seat; The oil pipe includes an upper oil pipe and a lower oil pipe that are connected and conducted. 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 to the bearing seat; the connecting part of the upper oil pipe and the lower oil pipe is located on the casing body of the inner casing, and a sealing assembly for sealing the joint between the upper oil pipe and the lower oil pipe is provided on the casing body of the inner casing.

[0008] Optionally, the sealing assembly includes a sealing cover arranged on the inner casing body, a sealing sleeve is arranged in the sealing cover, the sealing sleeve is arranged 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, and the sealing cover is provided with a conical groove matching the outer contour of the lower end of the sealing sleeve. The bottom end of the upper oil pipe abuts against the upper end of the sealing sleeve to press the sealing sleeve against the sealing cover.

[0009] Optionally, the outer contour of the upper end of the sealing sleeve is a conical surface with a diameter gradually increasing from top to bottom, and a connecting sleeve is provided at the bottom end of the upper oil pipe. The connecting sleeve is arranged on the top of the sealing sleeve, and the inner wall of the connecting sleeve is a conical surface matching the outer contour of the top of the sealing sleeve.

[0010] Optionally, the connecting sleeve and the upper oil pipe are integrally formed, and the upper end of the lower oil pipe extends into the connecting sleeve and fits with the lower end surface of the upper oil pipe.

[0011] Optionally, a mounting seat is provided at the top end of the upper oil pipe, and the mounting seat is fixedly connected to the outer culvert casing by bolts.

[0012] Optionally, an oil pipe connecting hole is provided in the bearing seat, and the lower end of the lower oil pipe is inserted into the oil pipe connecting hole.

[0013] Optionally, an asbestos pad is provided at the bottom of the connecting hole, and the lower end surface of the lower oil pipe is tightly pressed against the asbestos pad.

[0014] Optionally, the sealing cover includes a positioning section located in the outer casing cavity and a sealing section located in the inner casing cavity, the upper end of the positioning section has an opening for insertion of the upper oil pipe, the lower end of the positioning section is communicated with the sealing section, and the conical groove of the sealing cover is arranged on the sealing section.

[0015] According to another aspect of the present invention, a method for installing an oil pipe of a turbofan engine bearing seat is provided, which comprises the following steps: S100, assemble the sealing sleeve and the lower oil pipe so that the sealing sleeve is located at the upper end of the lower oil pipe; S200, install the lower oil pipe, insert the lower oil pipe through the inner casing and the transition section into the oil pipe connecting hole, so that the sealing sleeve is located in the sealing cover on the inner casing; S300, equipped with an external casing; 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 sealing cover and dock with the lower oil pipe; S500, lock the upper oil pipe, fix the upper end of the upper oil pipe on the outer culvert casing by bolts. Under the pressure of the bolts, the upper oil pipe has a downward extrusion force, so that the connecting sleeve and the conical surface at the top of the sealing sleeve fit tightly, and the sealing sleeve is compressed so that the sealing cover and the conical surface at the bottom of the sealing sleeve fit tightly.

[0016] Optionally, before installing the lower oil pipe, an asbestos pad is installed in the oil pipe connection hole; In the step of locking the upper oil pipe, the squeezing force of the upper oil pipe acts on the asbestos pad through the lower oil pipe, causing the asbestos pad to produce a preset deformation compression amount.

[0017] In summary, the present application includes at least one of the following beneficial technical effects: The present invention divides the oil pipe into an upper oil pipe and a lower oil pipe, wherein 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 between the inner casing and the transition section. This design effectively reduces the aspect ratio of the oil pipe, reduces the risk of deformation during processing, and reduces the requirement for coaxiality, making processing easier and the accuracy easier to control.

[0018] In addition, the connection part of the upper and lower oil pipes of the oil pipe is located on the casing body of the inner casing, and a sealing component for sealing the oil pipe joint is set on the casing body of the inner casing. These sealing components ensure the sealing effect of the oil pipe connection part through reasonable coordination, avoiding the common sealing problem in traditional designs. The design of the sealing component improves the flexibility of assembly and reduces the requirements for assembly accuracy, thereby reducing the difficulty and cost of assembly caused by accuracy problems.

[0019] In traditional designs, the oil inlet and return pipes of the bearing seat need to pass through multiple layers of casings, and the connection requirements between each layer of casings are very fine, which increases the difficulty of processing and assembly. In addition, the axial deformation of the inner and outer casings caused by temperature differences is mismatched, and shear stress is easily generated, thereby causing deformation. However, through the design of the present invention, the segmented structure of the oil pipe reduces the rigidity problem of the pipeline and avoids the connection difficulties between multiple layers of casings. At the same time, through the sealing effect of the sealing assembly, the mismatch of the axial deformation of the inner and outer casings is reduced, greatly reducing the requirements for processing accuracy and assembly accuracy. Overall, the present invention reduces the difficulty of processing and costs through structural optimization and sealing design, while improving assemblability and reliability.

[0020] Different from the conventional technical concept, the present invention reversely splits the oil pipe and sets an adaptive sealing structure such as a sealing sleeve at the middle connection, so as to actively use the segmented transition of the upper and lower oil pipes to buffer the problem of inconsistent axial deformation of the outer casing and the transition section. After the accumulated tolerance and installation error of a single oil pipe between the multi-layer casings are reduced, the processing and assembly accuracy requirements can be significantly reduced; reduce thermal deformation transmission: after segmentation, the temperature difference deformation between the outer casing and the bearing seat is "divided" at the inner casing, and flexible compensation is achieved through the double-conical surface of the sealing sleeve, so that the thermal stress is not transmitted along the entire oil pipe, reducing the damage to the seal caused by deformation; enhance the sealing reliability: the bolt tightening force of the upper oil pipe is transmitted to the sealing sleeve, realizing the bidirectional compression of the upper and lower cone surfaces of the sealing sleeve, and then combined with the elastic buffering of the asbestos pad, it can maintain effective sealing for a long time under harsh working conditions such as high temperature, high pressure, and vibration.

[0021] Furthermore, the present invention does not simply divide the oil pipe into multiple sections and connect them fixedly, but reasonably sets the connection position at the inner casing and cooperates with a special sealing component, so that it can take into account the stiffness improvement brought by the segmentation and the sealing enhancement brought by the double-conical surface adaptive compensation. This solution is segmented 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 coaxiality of the assembly; double cone surface + sealing cover: realize the axial extrusion and adaptive matching of the upper and lower oil pipes to the sealing sleeve to meet the sealing requirements under a wide working temperature range; elastic compression of the asbestos pad: absorb the slight displacement of the end of the lower oil pipe under high temperature vibration and further protect the risk of oil leakage in the bearing seat. Through the combination of the above elements, the present invention overcomes the prejudice of the prior art and solves the problems of high cost caused by the difficulty in processing the inlet and return oil pipes of the bearing seat and the high assembly precision requirements with the casing.

[0022] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary 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: Figure 1 This is a schematic diagram of the oil pipe installation structure of the turbofan engine bearing seat of the present invention; Figure 2 It is a structural schematic diagram of the sealing sleeve of the present invention; Figure 3 It is a schematic diagram of the structure of the asbestos pad of the present invention.

[0024] Legend: 1. Upper oil pipe; 2. Lower oil pipe; 3. Outer casing; 4. Inner casing; 5. Transition section; 6. Sealing sleeve; 7. Bearing seat; 8. Low-pressure bearing seat; 9. Asbestos pad. DETAILED DESCRIPTION

[0025] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0026] The following is combined with Figure 1-3 This application is described in further detail.

[0027] The embodiments of the present application disclose a turbofan engine bearing seat oil pipe installation structure and installation method.

[0028] Reference Figure 1 The oil pipe installation structure of the turbofan engine bearing seat 7 includes 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. The oil pipe passes through the outer casing 3, the inner casing 4 and the transition section 5 in sequence and is connected to the bearing seat 7; the oil pipe includes an upper oil pipe 1 and a lower oil pipe 2 that are connected and conducted. 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 to the external oil circuit; the lower oil pipe 2 is located in the cavity between the inner casing 4 and the transition section 5, and is used to be connected to the bearing seat 7; the connecting part of 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.

[0029] The oil pipe installation structure of the turbofan engine bearing seat 7 includes an oil inlet pipe and an oil return pipe, each of which is composed of an upper oil pipe 1 and a lower oil pipe 2. The upper oil pipe 1 of the oil inlet pipe is located in the cavity between the outer casing 3 and the inner casing 4, responsible for connecting the external oil circuit and transporting the oil to the bearing seat 7; the lower oil pipe 2 of the oil return pipe is located in the cavity between the inner casing 4 and the transition section 5, responsible for guiding the return oil passing through the bearing back to the system. The upper oil pipe 1 and the lower oil pipe 2 are connected through the casing body of the inner casing 4, and a sealing component is provided at the connection part to prevent oil or gas leakage at the joint of the two oil pipes. Through this design, the arrangement of the oil pipe not only optimizes the flow path of the oil inlet and return, but also effectively improves the sealing and assembly of the system. During the installation process, the oil pipe is smoothly connected through the cavity 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 joint through reasonable cooperation, avoiding the risk of oil and gas leakage. At the same time, this segmented design reduces the aspect ratio of the oil pipe, reduces the risk of deformation during processing, simplifies the control of coaxiality, and significantly reduces the difficulty of processing. Since the design of the oil pipe is relatively simple and has good rigidity, it avoids the coaxiality problems caused by poor rigidity and deformation of traditional oil pipes, and also reduces the high requirements for assembly accuracy, thereby reducing the difficulty of assembly and reducing manufacturing costs. In addition, the sealing component of the inner casing 4 effectively reduces the impact of axial deformation mismatch caused by temperature difference on the oil pipe, further improving the stability and reliability of the entire oil pipe system.

[0030] Reference Figure 2The sealing assembly includes a sealing cover arranged on the casing body 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 with a diameter decreasing from top to bottom, and a conical groove matching the outer contour of the lower end of the sealing sleeve 6 is arranged on the sealing cover, and the bottom end of the upper oil pipe 1 abuts against the upper end of the sealing sleeve 6 to press the sealing sleeve 6 onto the sealing cover. Specifically, the sealing cover is arranged on the casing body of the inner casing 4, and a sealing sleeve 6 is installed inside the sealing cover, and the sealing sleeve 6 is sleeved on the upper end portion of the lower oil pipe 2. The design of the sealing sleeve 6 has a certain conical structure, wherein the diameter of the outer contour of the lower end gradually decreases from top to bottom to form a conical surface shape, and the sealing cover is also designed with a conical groove matching the outer contour of the lower end of the sealing sleeve 6. During the installation process, 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 to the sealing cover by compression, ensuring that the sealing sleeve 6 can form an effective seal at the connection position. 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, and a tight fit is achieved during the installation process, which can effectively prevent oil leakage. This conical sealing design not only improves the sealing performance of the connection, but also can adapt to the slight deformation caused by different temperature changes during the connection process of the oil inlet pipe and the oil return pipe of the bearing seat 7 oil pipe, ensuring the sealing effect during long-term operation.

[0031] The outer contour of the upper end of the sealing sleeve 6 is a conical surface with a gradually increasing diameter 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 of the sealing sleeve 6, and the inner wall of the connecting sleeve is a conical surface matching the outer contour of the top 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 of the sealing sleeve 6. The inner wall of the connecting sleeve is designed to be a conical surface matching the outer contour of the top of the sealing sleeve 6. Such a conical surface match can tightly combine the connecting sleeve and the sealing sleeve 6 during the installation process, ensuring a good sealing effect between the two.

[0032] The sealing sleeve 6 is a waist-shaped structure as a whole, including two conical surfaces. Specifically, the outer contour of the lower end of the sealing sleeve 6 is a conical surface whose diameter decreases from top to bottom, while the outer contour of the upper end is a conical surface whose diameter gradually increases from top to bottom. Such a waist-shaped design enables the sealing sleeve 6 to form a tight fit between the sealing cover and the connecting sleeve at both ends. The sealing sleeve 6 with this waist-shaped structure will exert a stronger sealing effect when the upper oil pipe 1 generates a downward force. Since the sealing sleeve 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 a downward extrusion force is applied, this pressure not only acts on the upper conical surface of the sealing sleeve 6, but also is transmitted to the conical surface at the lower end through the entire structure. As a result, both conical surfaces of the sealing sleeve 6 are squeezed, causing the sealing sleeve 6 to deform. This deformation causes the outer surface of the sealing sleeve 6 to fit more closely to the sealing surface in contact with it, including the conical groove of the sealing cover and the conical inner wall of the connecting sleeve. Through this double extrusion and deformation, the sealing performance of the sealing sleeve 6 is significantly improved, thereby effectively preventing oil or gas leakage. This structural design can adapt to changes and maintain good sealing performance under high pressure or high temperature working environments, especially in the long-term operation process, it can cope with the slight deformation caused by temperature difference and pressure fluctuation, ensuring a long-lasting and stable sealing effect.

[0033] The sealing 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 connected with the sealing section, and the conical groove of the sealing cover is arranged in the sealing section. The sealing 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 arranged 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, thereby avoiding possible deviation or misalignment during the installation process. The lower end of the positioning section is connected with the sealing section, so that the entire sealing cover forms a continuous structure and provides a stable channel. A conical groove is arranged in the sealing section, which matches the outer contour of the lower end of the sealing sleeve 6, further enhancing the sealing effect. When the sealing sleeve 6 is installed in the sealing cover, the conical groove can ensure the tight fit between the lower end of the sealing sleeve 6 and the sealing cover, effectively preventing oil leakage. Through this structural design, the sealing 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. 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 closely with 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 parts, but also avoids assembly errors or looseness problems that may occur at the connection site, thereby enhancing the firmness and sealing of the connection. Structurally, this one-piece design ensures a tight fit between the connecting sleeve and the upper oil pipe 1, and can effectively prevent leakage caused by improper assembly or gaps between parts. In addition, the upper end of the lower oil pipe 2 extends into the connecting sleeve and fits closely with 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 smoother and avoiding the risk of leakage at the joints. 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, thereby ensuring the stability of the oil pipe system. A mounting seat is provided at the top of the upper oil pipe 1, and the mounting seat is fixedly connected to the outer casing 3 by bolts. The mounting seat provides a stable connection point, so that the upper oil pipe 1 can be reliably fixed on the outer casing 3. This structural design effectively prevents the oil pipe from loosening or displacement due to vibration or pressure changes during operation, ensuring that the oil pipe always maintains the correct position.

[0034] Reference Figure 3 The bearing seat 7 is used to support the high-pressure rotor, and the low-pressure bearing seat 8 is used to support the low-pressure rotor. An oil pipe connection hole is provided in the bearing seat 7, and the lower end of the lower oil pipe 2 is plugged into the oil pipe connection hole. An asbestos pad 9 is provided at the bottom of the connection hole, and the lower end surface of the lower oil pipe 2 is pressed tightly against the asbestos pad 9. The oil pipe connection hole provided in the bearing seat 7 provides a precise plug-in position for the lower oil pipe 2, ensuring that the connection between the lower oil pipe 2 and the bearing seat 7 is more stable and reliable. The lower end of the lower oil pipe 2 is plugged into the connection hole, effectively connecting the oil channel with the bearing seat 7, and ensuring the continuity and smoothness of the oil system. Through this plug-in method, it can be ensured that the oil pipe will not fall off or loosen due to vibration or external force under high-pressure and high-temperature operating conditions, thereby avoiding oil leakage or system failure. The provision of the asbestos pad 9 further enhances the sealing performance. The asbestos pad 9 has good high temperature and pressure resistance, and can effectively resist the risk of oil leakage. The presence of the asbestos pad 9 enables the lower end surface of the lower oil pipe 2 to form a uniform compression effect when pressed, ensuring the sealing between the lower oil pipe 2 and the oil pipe connection hole. Especially in a working environment with high temperature or large pressure changes, the asbestos pad 9 can provide sufficient elastic deformation to keep the sealing performance of the joint in the best state and prevent oil leakage.

[0035] According to another aspect of the present invention, a method for installing an oil pipe of a turbofan engine bearing seat 7 is provided, which comprises the following steps: 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 .

[0036] In step S100, the process of assembling the sealing sleeve 6 and the lower oil pipe 2 first needs to ensure that the sealing sleeve 6 is correctly installed on the upper end of the lower oil pipe 2. In the specific operation, the sealing sleeve 6 will first be aligned with the top of the lower oil pipe 2. Usually, the sealing sleeve 6 has a precise size and shape so that it can be smoothly inserted into the upper end of the lower oil pipe 2. The inner diameter of the sealing sleeve 6 usually matches the outer diameter of the lower oil pipe 2 to ensure that the sealing sleeve 6 can be tightly fixed on the upper end of the lower oil pipe 2. This process includes gently pushing or sliding the sealing sleeve 6 into the upper end of the lower oil pipe 2 until the sealing sleeve 6 is firmly positioned on the top of the lower oil pipe 2. In order to ensure the correct installation of the sealing sleeve 6, it may be necessary to use tools or certain manual operations to help the sealing sleeve 6 be firmly installed on the lower oil pipe 2 by means of slight squeezing or rotation. During the installation process, it is also necessary to pay attention to the direction and position of the sealing sleeve 6 to ensure that the tapered surface at its lower end can adapt to the cooperation with the sealing cover during subsequent assembly to avoid the problem of misalignment or incomplete contact.

[0037] S200, install the lower oil pipe 2, insert the lower oil pipe 2 into the oil pipe connecting hole through the inner casing 4 and the transition section 5, so that the sealing sleeve 6 is located in the sealing cover on the inner casing 4.

[0038] In step S200, the process of installing the lower oil pipe 2 first involves accurately passing 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 to avoid affecting subsequent connections and sealing due to misalignment or misalignment. During the installation process, the lower oil pipe 2 will first be guided through the cavity of the inner casing 4, then pass through the transition section 5, and finally inserted into the oil pipe connection hole on the bearing seat 7.

[0039] During this process, the installation of the sealing sleeve 6 is particularly critical because it is located at the upper end of the lower oil pipe 2. As the lower oil pipe 2 is installed, the sealing sleeve 6 will also be brought into the sealing cover inside the inner casing 4. The sealing cover has a specific shape and structural design, so that the sealing sleeve 6 can be smoothly positioned and maintained in the appropriate position. The function of the sealing cover is to ensure that the sealing sleeve 6 is perfectly docked with the conical groove inside it, thereby forming an efficient sealing interface to prevent oil or gas leakage.

[0040] S300, assemble the outer casing 3.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] Before installing the lower oil pipe 2, the asbestos pad 9 is installed in the oil pipe connection hole; in the step of locking the upper oil pipe 1, the extrusion force of the upper oil pipe 1 acts on the asbestos pad 9 through the lower oil pipe 2, so that the asbestos pad 9 produces a preset deformation and compression. During the installation process, the asbestos pad 9 is accurately 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 pad 9, the elasticity and adaptability of the asbestos pad 9 enable it to be properly compressed and form a preliminary sealing effect. Subsequently, in the step of locking the upper oil pipe 1, the bolts fix the upper end of the upper oil pipe 1 on the outer casing 3 by pressing it, and this process will generate a downward extrusion force. The extrusion force of the upper oil pipe 1 is transmitted to the asbestos pad 9 through the lower oil pipe 2. After the asbestos pad 9 is squeezed, it will produce a preset deformation and compression. This compression makes the asbestos pad 9 fit more closely to the bottom of the oil pipe connection hole and forms a more solid and reliable seal on the lower end surface of the lower oil pipe 2. In this way, the deformation and compression of the asbestos pad 9 helps to further enhance the sealing effect and ensure that oil will not leak at the oil pipe connection part.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. The oil pipe installation structure of the turbofan engine bearing seat is characterized by: It comprises an outer casing (3), an inner casing (4), a transition section (5) and a bearing seat (7), wherein 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 to 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 an outer casing (3) and an inner casing (4) and is used to connect an external oil circuit. The lower oil pipe (2) is located in a cavity between the inner casing (4) and a transition section (5) and is used to connect to a bearing seat (7). The connecting portion of the upper oil pipe (1) and the lower oil pipe (2) is located on the casing body of the inner casing (4). 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 a turbofan engine bearing seat oil pipe, using the turbofan engine bearing seat oil pipe installation structure according to any one of claims 1 to 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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