Bearing seat structure and rigidity calculation method thereof

Abstract

The invention discloses a bearing seat structure and a rigidity calculation method thereof, and belongs to the technical field of aero-engine parts, and the bearing seat structure comprises a base body part, and a plurality of ventilation plate groups and heat insulation plate bodies which are mounted on a second split part of the base body part. According to the bearing seat, the cooling and reinforcing structure is designed on the basis of the base body structure and the mounting edge structure of the bearing seat, on one hand, the strength and rigidity needed by the bearing seat in actual work can be greatly improved under the condition that the weight is not obviously increased, and the power-to-weight ratio of an engine is guaranteed; on the other hand, the good heat insulation effect can be achieved on the premise that the radial size is not obviously increased, and the performance of the engine is greatly improved.

Description

Technical Field

[0001] This application belongs to the technical field of aero-engine parts, and particularly relates to a bearing housing structure. Background Art

[0002] In an aero-engine, the bearing housing is mainly used to install and support the bearing, transfer the load borne by the bearing to the casing, and at the same time, through the lubricating oil passage provided inside the bearing housing, provide a lubricating and cooling passage for the bearing. Since modern aero-engines need to further improve the power-to-weight ratio, the temperature before the turbine increases significantly, and the heat transfer of the high-temperature gas to the bearing cavity becomes more intense. To prevent the bearing cavity temperature from being too high and affecting the bearing cooling effect, methods such as setting a cooling cavity and a heat insulation cover are often used to reduce the bearing cavity temperature, which will lead to an increase in the cooling air consumption of the engine and affect the engine performance; in addition, for the compact structure design, the bearing housing also needs to have sufficient strength and stiffness to resist the vibration generated during the rotation of the turbine shaft while further shortening the axial length. Generally, increasing the wall thickness is used to improve its stiffness and strength, resulting in a decrease in the power-to-weight ratio of the engine.

[0003] Application Content

[0004] The purpose of this application is to provide a bearing housing structure to solve the problems in the existing aero-engine bearing housing during use as mentioned in the above background art.

[0005] To achieve the above purpose, on the one hand, this application provides a bearing housing structure, including:

[0006] A base part, which defines a hollow interval for accommodating the bearing therein, and the base part has a first split part and a second split part in the circumferential direction. The axial two ends of the second split part radially extend outward to form mounting edges, and at least one mounting hole is provided on the mounting edges.

[0007] Multiple groups of ventilation plate groups, which are spaced in the circumferential direction and are assembled on the outer wall surface of the second split part. The mounting edge is provided with at least one second ventilation hole at the position of each group of ventilation plate groups. A single group of ventilation plate groups includes at least one ventilation plate body, and at least one first ventilation hole is provided on the ventilation plate body.

[0008] Multiple heat insulation plate bodies, which are spaced in the circumferential direction. A single heat insulation plate body extends along the circumferential direction and the axial direction. The inner surface of the heat insulation plate body is attached to the outer wall surface of the ventilation plate body, and the two axial ends of the heat insulation plate body respectively abut against the mounting edges at the two axial ends of the second split part.

[0009] Further, a plurality of the first ventilation holes are provided, and the plurality of first ventilation holes are spaced in the radial direction and / or the circumferential direction.

[0010] Furthermore, the single set of ventilation plate groups includes a plurality of ventilation plate bodies, the plurality of ventilation plate bodies are spaced apart in the axial direction, and the first ventilation holes on the plurality of ventilation plate bodies are offset in the circumferential and / or radial directions.

[0011] Furthermore, at least a part of the mounting edge axially extends to form a thickened layer, the second ventilation holes are arranged on the thickened layer and extend along the axial direction.

[0012] Furthermore, the mounting holes are arranged on the thickened layer and configured as wire insert holes.

[0013] Furthermore, both the first split part and the second split part are composed of two radially symmetric parts.

[0014] Furthermore, the bearing seat further includes a plurality of reinforcing ribs arranged on the outer surface of the second split part, the plurality of reinforcing ribs are spaced apart in the circumferential direction, a single reinforcing rib extends along the axial direction, the outer wall surface of the reinforcing rib contacts the inner surface of the heat insulation plate body, and both ends of a single reinforcing rib respectively abut against the mounting edges at both axial ends of the second split part.

[0015] Furthermore, both ends in the circumferential direction of a single ventilation plate body are provided with reinforcing ribs.

[0016] Furthermore, the diameter of the first ventilation holes is 1-3 mm.

[0017] On the other hand, the present application discloses a method for calculating the structural stiffness of a bearing seat, which is used to calculate the stiffness of the above-mentioned bearing seat. The method includes:

[0018] Performing mesh division on the overall model of the bearing seat;

[0019] Applying circumferential constraints to the nodes in the mounting holes and applying axial constraints to the mounting edges;

[0020] Applying at least two unit forces in different radial directions at the center position of the bearing bearing surface and transmitting the unit forces to the bearing bearing surface;

[0021] Calculating the displacements of the center of the bearing bearing surface of the bearing seat in different radial directions by finite element;

[0022] Calculating the stiffness of the bearing seat in different radial directions based on the unit forces and displacements of the center of the bearing bearing surface of the bearing seat in different radial directions.

[0023] Compared with the prior art, the beneficial effects of the present application are:

[0024] This application designs the cooling and strengthening structures based on the matrix structure and mounting edge structure of the bearing housing itself. On the one hand, it can significantly improve the strength and stiffness required for the actual operation of the bearing housing without significantly increasing the weight, ensuring the power-to-weight ratio of the engine. On the other hand, it can achieve good heat insulation effect without significantly increasing the radial dimension, greatly improving the performance of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is an exploded view of the bearing housing;

[0026] Figure 2 It is a schematic diagram of a partial structure of the bearing housing Figure 1 ;

[0027] Figure 3 It is a schematic diagram of a partial structure of the bearing housing Figure 2 ;

[0028] Figure 4 It is an assembly schematic diagram of the bearing housing;

[0029] Figure 5 It is a schematic diagram of the cold air flow of the bearing housing.

[0030] In the figure:

[0031] 10. Matrix component; 10a. Load-bearing surface;

[0032] 100. Matrix part; 100a. First split part; 100b. Second split part; 101. Limiting part; 102. Mounting edge; 102a. Thickened layer; 103. Mounting hole; 104. Second ventilation hole; 105. Inlet and return oil mounting seat;

[0033] 200. Ventilation plate group; 201. Ventilation plate body; 202. First ventilation hole;

[0034] 300. Heat insulation plate body; 301. Reinforcing rib. SPECIFIC EMBODIMENTS

[0035] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0036] A bearing housing structure, referring to Figure 1, the main body is composed of a base member 10, multiple groups of ventilation plate groups 200, and multiple heat insulation plate bodies 300. In some embodiments, the above-mentioned base member 10 includes a base portion 100, which is axially extended and defines a cylindrical hollow area for accommodating a bearing therein, that is, the base portion 100 is generally configured as an axially extended sleeve-like component. Continuing to refer to Figure 1 , a limiting portion 101 in the shape of an annular plate body extends radially inward from one end edge in the axial direction of the above-mentioned base portion 100.

[0037] Refer to Figure 2 , the above-mentioned base portion 100 has a first split portion 100a and a second split portion 100b in the circumferential direction. The first split portion 100a and the second split portion 100b are arranged at an angle in the circumferential direction. In some embodiments, both the first split portion 100a and the second split portion 100b are composed of two radially symmetric parts, and the area of the second split portion 100b is larger than the area of the first split portion 100a. Continuing to refer to Figure 2 , the outer surface of the above-mentioned first split portion 100a is configured as the mounting surface of the oil inlet and return seat 105, that is, the oil inlet and return seat 105 is fixed on the outer surface of the first split portion 100a, and a plurality of oil inlet and return holes are provided on the oil inlet and return seat 105.

[0038] In some embodiments, refer to Figure 2 , the above-mentioned ventilation plate group 200 is assembled on the outer surface of the second split portion 100b, and multiple groups of ventilation plate groups 200 are spaced in the circumferential direction. A single group of ventilation plate groups 200 includes at least one ventilation plate body 201 with a diameter of 1-3 mm. When there are multiple ventilation plate bodies 201, the multiple ventilation plate bodies are spaced in the axial direction. Exemplarily, the above-mentioned ventilation plate body 201 is fixed on the outer surface of the second split portion 100b by welding or clamping, and is generally configured as a fan-shaped ring component, that is, the ventilation plate body 201 extends in the circumferential direction and the radial direction. Specifically, the above-mentioned ventilation plate body 201 has an inner surface that fits the outer surface of the second split portion 100b and an outer surface that extends radially outward from the inner surface of the ventilation plate body 201. Continuing to refer to Figure 2 , a plurality of first ventilation holes 202 distributed in an annular array are provided on the above-mentioned ventilation plate body 201, that is, the multiple first ventilation holes 202 are spaced in the circumferential direction. By providing the first ventilation holes 202, the axial flow of the cooling gas is allowed (for example Figure 5(flow in the flow direction in the example), in some embodiments, the diameter of the first ventilation hole 202 is 1-3 mm. At this time, the amount of cooling gas used can be adjusted by adjusting the size of the first ventilation hole 202. In some embodiments, the first ventilation holes 202 on different ventilation plate bodies 201 in the same group of ventilation plate groups 200 are arranged in a staggered manner in the circumferential direction and / or the radial direction. Based on the staggered design of the first ventilation holes 202, the heat transfer in the subsequent cooling gas cavity can be enhanced, ensuring the cooling effect of the bearing housing.

[0039] In some embodiments, referring to Figure 3 and in combination with Figure 2 , the axial ends of the two edges of the second split part 100b extend radially outward to form mounting edges 102. At the same time, at least one second ventilation hole 104 is provided at the corresponding position of the mounting edge 102 in the ventilation plate group 200. During the cooling process of the bearing housing, the cooling gas enters the subsequent cooling gas cavity from the second ventilation hole 104 of the mounting edge 102 at one axial end of the second split part 100b, and then passes through the first ventilation holes 202 of each ventilation plate body 201 in the ventilation plate group 200 in sequence, and then flows out from the second ventilation hole 104 of the mounting edge 102 of the second split part 100b in the axial direction to achieve the cooling of the bearing housing. In some embodiments, at least a part of the mounting edge 102 extends axially to form a thickened layer 102a. In some examples, the thickened layer 102a has a strip structure, and the thickness of the thickened layer 102a is 3-8 mm. Based on the design of the thickened layer 102a, the strength and stiffness of the bearing housing can be improved. In some embodiments, the second ventilation hole 104 is formed on the thickened layer 102a and extends in the axial direction to form a channel structure, providing a channel for the cooling gas to enter the subsequent heat exchange cavity and facilitating the inflow and outflow of the cooling gas.

[0040] Continue to refer to Figure 2 The second mounting edge 102 is further provided with at least one mounting hole 103. In some examples, the mounting hole 103 is provided on the thickened layer 102a and is configured as a wire insert hole for easy installation in a compact space.

[0041] In some embodiments, the heat insulation plate body 300 is configured as an arc-shaped plate body extending in the circumferential direction and the axial direction, and the inner surface of the heat insulation plate body 300 is attached to the outer surface of the ventilation plate body 201. The heat exchange cavity is jointly defined by the ventilation plate body 201 and the heat insulation plate body 300. Both ends of the heat insulation plate body 300 in the axial direction are abutted against the end surfaces of the installation edges 102, that is, the two ends of the heat exchange cavity in the axial direction are closed by the installation edges 102. In some embodiments, the thickness of the heat insulation plate body 300 is 0.5 mm to 1.5 mm, and the heat insulation plate body 300 is installed by welding or clamping. The heat insulation plate body 300 isolates the heat radiation of the gas to the inner cavity of the bearing. In some embodiments, the circumferential length of the single heat insulation plate body 300 is equal to the circumferential length of the ventilation plate body 201. In other embodiments, the number of the heat insulation plate bodies 300 is equal to the number of divisions of the second split part 100b, and the circumferential length of the heat insulation plate body 300 is equal to the circumferential length of a single part of the second split part 100b. Exemplarily, for example Figure 2 In the Figure 2 , the second split part 100b includes two radially symmetric parts, that is, the second split part 100b is divided into two parts. Correspondingly, two heat insulation plate bodies 300 are provided. At this time, a single heat insulation plate body 300 can form a covering outside a single part of the second split part 100b in the circumferential direction, further improving the heat exchange effect.

[0042] Refer to Figure 3, the above bearing housing further has a plurality of reinforcing ribs 301. The plurality of reinforcing ribs 301 are fixed to the outer surface of the second split part 100b and are spaced in the circumferential direction. Specifically, a single reinforcing rib 301 extends in the axial direction. Axial ends of a single reinforcing rib 301 respectively abut against the mounting edges 102 at both axial ends of the second split part 100b. At the same time, the radially outer surface of the reinforcing rib 301 fits against the inner surface of the heat insulation plate body 300. Through the arrangement of the reinforcing ribs 301, on the one hand, the strength of the bearing housing can be improved on the premise of a slight increase in the weight of the bearing housing. Exemplarily, the thickness of the reinforcing rib 301 is 5 - 15 mm. On the other hand, through the arrangement of the reinforcing ribs 301, the above heat exchange cavity can be closed in the circumferential direction. In some embodiments, both axial ends in the circumferential direction of the above air vent plate body 201 are provided with reinforcing ribs 301 to form a closure at both circumferential ends of the heat exchange cavity. Cooperating with the closed design of the heat insulation plate body 300 and the base part 100 in the radial direction, and the closed design of the air vent plate body 201 and the mounting edge 102 in the axial direction, a closed heat exchange cavity structure can be formed. When the bearing housing is in use, the cooling air can only flow through the second air vent holes 104 of the mounting edge 102 and the first air vent holes 202 on the air vent plate body 201, improving the cooling effect of the bearing housing. Further, adjacent air vent plate groups 200 in the circumferential direction share the same reinforcing rib 301. On the one hand, the maximum utilization of space can be achieved, and on the other hand, it can be avoided that excessive setting of the reinforcing ribs 301 causes the bearing housing to be too heavy.

[0043] The present application also provides a method for calculating the stiffness of a bearing housing with reinforcing ribs 301 and a welding structure. The specific steps are as follows:

[0044] S100: Perform mesh division on the overall model of the bearing housing;

[0045] Specifically, the overall model of the bearing housing is the bearing housing model in the assembled state, where the welded parts are connected together by binding.

[0046] S200: Apply circumferential constraints to the nodes in the mounting holes 103 and apply axial constraints to the mounting edges 102;

[0047] Specifically, in this step, in order to facilitate the application of constraints to the bearing housing, a cylindrical coordinate system needs to be established first. The axial direction of the bearing housing corresponds to the Z direction of the cylindrical coordinate system, and the X and Y directions of the cylindrical coordinate system respectively correspond to the radial and circumferential directions of the bearing housing. In the cylindrical coordinate system, the circumferential constraints of the nodes in the mounting holes 103 and the axial constraints of the mounting edges 102 can be applied correspondingly.

[0048] S300: Apply at least two unit forces in different radial directions at the center of the bearing bearing surface 10a and transmit the unit forces to the bearing bearing surface 10a;

[0049] In this step, to understand the stiffness of the bearing housing in all directions and considering the asymmetry of its structure, for example, in the above bearing housing structure, the first split part 100a, the second split part 100b, the ventilation plate group 200 based on the first split part 100a and the second split part, and the oil inlet and return mounting seat 105 are asymmetrically designed. To eliminate the influence of this asymmetry, it is necessary to calculate the stiffness of the bearing housing in different radial directions. Specifically, taking the example that both the first split part 100a and the second split part 100b in the bearing structure are composed of two radially symmetric parts, correspondingly, referring to Figure 4 , taking the X-axis and Z-axis directions in the Cartesian coordinate system in the figure as examples (where the first split part 100a includes two parts symmetrically arranged in the X-axis direction and the second split part 100b includes two parts symmetrically arranged in the Z-axis direction), correspondingly, apply a unit force F (unit: N) along the positive X-axis direction and the positive Z-axis direction of the Cartesian coordinate system (the coordinate system is as shown) at the center of the bearing housing bearing surface 10a, and transfer the force to the bearing surface 10a by establishing an MPC (multi-point constraint, such as RBE3). Further, while applying the unit force, a temperature load can be applied according to the specific temperature field of the part.

[0050] S400: Calculate the displacements (unit: m) of the center of the bearing housing bearing surface 10a in different radial directions by finite element method;

[0051] Specifically, in the above example, that is, correspondingly calculate the lateral displacements L X and L Z of the center of the bearing housing bearing surface 10a in the X direction and the Z direction (Cartesian coordinate system);

[0052] S500: Calculate the stiffness of the bearing housing in different radial directions based on the unit forces and displacements of the center of the bearing housing bearing surface 10a in different radial directions.

[0053] Specifically, the calculation formula for the stiffness in the X direction is with the unit of N / m, and the calculation formula for the stiffness in the Z-axis direction is with the unit of N / m.

[0054] Although the embodiments of the present application have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present application. The scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A bearing seat structure, characterized in that, Comprising: A base part (100) which defines a hollow space for accommodating a bearing therein, and the base part (100) has a first split part (100a) and a second split part (100b) in the circumferential direction. Installation edges (102) are formed by radially outward extension of the axial two-end edges of the second split part (100b), and at least one installation hole (103) is provided on the installation edges (102); Multiple groups of ventilation plate groups (200) which are spaced in the circumferential direction and assembled on the outer wall surface of the second split part (100b). At least one second ventilation hole (104) is provided on the installation edge (102) at the position of each group of ventilation plate groups (200). A single group of ventilation plate groups (200) includes at least one ventilation plate body (201), and at least one first ventilation hole (202) is provided on the ventilation plate body (201); Multiple heat insulation plate bodies (300) which are spaced in the circumferential direction. A single heat insulation plate body (300) extends in the circumferential direction and the axial direction. The inner surface of the heat insulation plate body (300) is attached to the outer wall surface of the ventilation plate body (201), and the two axial ends of the heat insulation plate body (300) are respectively abutted against the installation edges (102) at the two axial ends of the second split part (100b).

2. The bearing housing structure according to claim 1, wherein: There are multiple first ventilation holes (202), and the multiple first ventilation holes (202) are spaced in the radial direction and / or the circumferential direction.

3. A bearing seat structure according to claim 1 or 2, characterized in that: A single group of ventilation plate groups (200) includes multiple ventilation plate bodies (201). The multiple ventilation plate bodies (201) are spaced in the axial direction, and the first ventilation holes (202) on the multiple ventilation plate bodies (201) are staggeredly arranged in the circumferential and / or radial directions.

4. A bearing seat structure according to claim 1, characterized in that: At least part of the installation edge (102) axially extends to form a thickened layer (102a), and the second ventilation hole (104) is provided on the thickened layer (102a) and extends in the axial direction.

5. The bearing seat structure according to claim 4, wherein: The installation hole (103) is provided on the thickened layer (102a) and is configured as a wire insert hole.

6. A bearing seat structure according to claim 1, characterized in that: Both the first split part (100a) and the second split part (100b) are composed of two radially symmetric parts.

7. A bearing seat structure according to claim 1, characterized in that: The bearing seat further includes multiple reinforcing ribs (301) provided on the outer surface of the second split part (100b). The multiple reinforcing ribs (301) are spaced in the circumferential direction. A single reinforcing rib (301) extends in the axial direction. The outer wall surface of the reinforcing rib (301) contacts the inner surface of the heat insulation plate body (300), and the two ends of a single reinforcing rib (301) are respectively abutted against the installation edges (102) at the two axial ends of the second split part.

8. A bearing seat structure according to claim 7, characterized in that: Reinforcing ribs (301) are arranged at both circumferential ends of a single ventilation plate body (201).

9. A bearing seat structure according to claim 1, characterized in that: The diameter of the first ventilation hole (202) is 1 - 3 mm.

10. A method for calculating the structural stiffness of a bearing seat, which is used to calculate the stiffness of the bearing seat according to any one of claims 1 to 9, and is characterized in that: The method includes: Performing mesh division on the overall model of the bearing seat; Applying circumferential constraints to the inner nodes of the installation hole (103) and applying axial constraints to the installation edge (102); Applying at least two unit forces in different radial directions at the center position of the bearing bearing surface (10a) and transmitting the unit forces to the bearing bearing surface (10a); The displacement of the center of the bearing seat bearing surface (10a) in different radial directions is calculated by finite element method; Based on the unit force and displacement of the center of the bearing seat bearing surface (10a) in different radial directions, the stiffness of the bearing seat in different radial directions is calculated.

Images