Method for determining axial dimension chain of supercharged lubricating oil pump shell for research and development of aero-engine

Abstract

The invention discloses a method for determining an axial dimension chain of a supercharged lubricating oil pump shell for aircraft engine research and development, and belongs to the technical field of lubricating oil pump research and development. The method comprises: determining the total thickness of inner and outer rotors; determining the total thickness of the eccentric sleeve; determining the total thickness of the interstage shell; determining the thickness of the upper cover; determining the thickness of the lower cover; determining the mounting thickness of the butterfly-shaped sheet; determining the thickness of the check ring; determining the thickness of the adjusting gasket; determining the distance between the check ring groove and the shell end face; the inner hole depth of the lubricating oil pump shell is determined; determining the wall thickness of the lubricating oil pump shell; and determining the total axial length of the lubricating oil pump shell. According to the lubricating oil pump assembly, the problem of repeated disassembly-grinding-reassembly operation caused by no systematic design calculation in the prior art is solved, the labor hour and the production cost are reduced, the assembly efficiency is improved, the rationality of the shell structure design and the assembly manufacturability are optimized, and the working stability and the production reliability of the lubricating oil pump assembly are improved.

Description

Technical Field

[0001] This invention relates to a method for determining the axial dimension chain of a booster oil pump housing used in aero-engine research and development, belonging to the field of oil pump research and development technology. Background Technology

[0002] In aero-engine lubrication systems, the oil pump assembly serves as the core oil supply unit. Its function is to draw lubricating oil from the oil tank, pressurize it, and then continuously supply lubricating media that meets the pressure requirements to various lubrication points of the engine. The oil pump housing, as the assembly carrier for internal components, directly affects the operational stability and assembly processability of the components due to the rationality of its structural design.

[0003] In existing technologies, the design process of aviation oil pump housings does not systematically calculate the axial dimensional chains of internal components. This leads to a situation where, after the housing design is completed, during the assembly of internal components, operators must repeatedly disassemble the oil pump assembly, remove adjusting shims for machining and grinding, and then repeat the disassembly-grinding-reassembly process based on assembly clearance test results to achieve the desired assembly tolerances. This not only increases manual labor time and production costs but also significantly reduces assembly efficiency due to repeated disassembly and reassembly. Furthermore, repeated machining may adversely affect the dimensional accuracy and surface quality of the adjusting shims. Summary of the Invention

[0004] To address the problems existing in the background art, the present invention provides a method for determining the axial dimension chain of the housing of a booster lubricating oil pump used in aero-engine research and development.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a method for determining the axial dimensional chain of a booster lubricating oil pump housing for aero-engine research and development, the method comprising the following steps:

[0006] S1: Determine the total thickness L4 of the inner and outer rotors;

[0007] S2: Determine the total thickness L4' of the eccentric sleeve;

[0008] S3: Determine the total thickness L5 of the interstage shell;

[0009] S4: Determine the thickness L6 of the top cover;

[0010] S5: Determine the thickness L3 of the lower cover;

[0011] S6: Determine the installation thickness L7 of the butterfly plate;

[0012] S7: Determine the thickness L2 of the retaining ring;

[0013] S8: Determine the thickness L8 of the adjusting shim;

[0014] S9: Determine the distance L10 between the retaining ring groove and the end face of the housing;

[0015] S10: Determine the inner bore depth L of the lubricating pump housing 内 ;

[0016] S11: Determine the wall thickness L of the lubricating oil pump housing 壁 ;

[0017] S12: Determine the total axial length L of the lubricating pump housing 总 =L 内 +L 壁 .

[0018] Furthermore, step S1 includes the following steps:

[0019] S101: Calculate the thickness B of the single-stage inner and outer rotors:

[0020]

[0021] In the formula:

[0022] This indicates that the host protocol requires a given traffic value;

[0023] Indicates the volumetric efficiency of the inner and outer rotors;

[0024] Indicates the area of ​​the inner and outer rotors;

[0025] Indicates the number of teeth on the inner and outer rotors;

[0026] Indicates the rated speed of the inner and outer rotors;

[0027] S102: Calculate the total thickness L4 of the inner and outer rotors:

[0028]

[0029] In the formula:

[0030] Indicates the number of stages of the inner and outer rotors.

[0031] Furthermore, step S3 includes the following steps:

[0032] S301: Calculate the thickness D of a single-stage interstage shell.

[0033]

[0034] S302: Calculate the total thickness of the interstage shell. :

[0035] .

[0036] Furthermore, step S6 includes the following steps:

[0037] S601: Calculate the axial hydraulic pressure of the disc. :

[0038]

[0039] In the formula:

[0040] Indicates the absolute pressure of the lubricating oil pump;

[0041] Indicates the axial oil pressure action area of ​​the oil outlet chamber in the interstage housing;

[0042] S602: Determine the axial deformation of the disc based on its elasticity curve. ;

[0043] S603: Set the preload of a single disc. ;

[0044] S604: The pre-compression amount of the two individual butterfly discs can be obtained as follows: ;

[0045] S605: Calculate the mounting thickness L7 of the butterfly plate:

[0046]

[0047] In the formula:

[0048] This indicates the free height of a single butterfly disc.

[0049] Furthermore, the calculation formula for L8 mentioned in S8 is as follows:

[0050]

[0051] In the formula:

[0052] This indicates the preset reference value for the axial length of the lubricating pump housing.

[0053] Furthermore, the L mentioned in S10 内 The calculation formula is as follows:

[0054] .

[0055] Compared with the prior art, the beneficial effects of the present invention are:

[0056] This invention effectively solves the problem of repeated disassembly-grinding-reassembly operations caused by the lack of systematic design calculations in the prior art by systematically calculating the axial dimensional chain of the internal components of the housing. This significantly reduces labor hours and production costs, and improves assembly efficiency. By accurately determining the thickness of each component and deriving the depth and total length of the housing's inner hole, it avoids the accumulation of axial dimensional errors, ensures assembly accuracy and stability, optimizes the rationality of the housing structure design and assembly processability, and reduces the adverse effects of repeated disassembly and assembly on the dimensional accuracy and surface quality of the adjusting shims, thereby improving the working stability and production reliability of the lubricating pump assembly. Attached Figure Description

[0057] Figure 1 This is a schematic diagram of the booster oil pump.

[0058] Figure 2 It is a curve diagram of the elasticity of a disc. Detailed Implementation

[0059] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0060] A method for determining the axial dimension chain of a booster oil pump housing for aero-engine research and development, the method comprising the following steps:

[0061] S1: Determine the total thickness L4 of the inner and outer rotors 6;

[0062] S2: Determine the total thickness L4' of the eccentric sleeve 8;

[0063] The inner and outer rotors 6 are placed in the inner hole of the eccentric sleeve 8. In order to ensure that the inner and outer rotors 6 can operate stably in the inner hole of the eccentric sleeve 8, the thickness of the eccentric sleeve 8 is the same as the thickness of the inner and outer rotors 6, that is, L4'=L4.

[0064] S3: Determine the total thickness L5 of the interstage shell 7;

[0065] S4: Determine the thickness L6 of the top cover 4 based on design experience;

[0066] S5: Determine the thickness L3 of the lower cover 3 based on design experience;

[0067] S6: Determine the installation thickness L7 of the butterfly plate 5;

[0068] S7: Determine the thickness L2 of retaining ring 1;

[0069] A retaining ring is installed at the inlet of the lubricating oil pump housing. The retaining ring serves to axially limit the assembly of components such as the interstage housing 7, eccentric sleeve 8, and inner and outer rotors 6, preventing these components from detaching from the pump housing. The size of the retaining ring can be selected from Q / 8S1336.2A-157.

[0070] S8: Determine the thickness L8 of adjusting shim 2;

[0071] S9: Determine the distance L10 between the retaining ring groove and the end face of the housing based on design experience;

[0072] S10: Determine the inner bore depth L of the lubricating pump housing 内 ;

[0073] S11: Determine the wall thickness L of the lubricating oil pump housing 壁 ;

[0074] S12: Determine the total axial length L of the lubricating pump housing 总 =L 内 +L 壁 .

[0075] Furthermore, step S1 includes the following steps:

[0076] S101: Calculate the thickness B of the single-stage inner and outer rotors 4:

[0077]

[0078] In the formula:

[0079] This indicates that the host protocol requires a given traffic value;

[0080] This indicates the volumetric efficiency of the inner and outer rotors 4;

[0081] This represents the area of ​​the inner and outer rotors 4;

[0082] This indicates the number of teeth on the inner and outer rotors (4).

[0083] This indicates the rated speed of the inner and outer rotors 4;

[0084] S102: Calculate the total thickness L4 of the inner and outer rotors 4:

[0085]

[0086] In the formula:

[0087] This indicates the number of stages in the inner and outer rotors.

[0088] Furthermore, step S3 includes the following steps:

[0089] S301: Calculate the thickness D of the single-stage interstage shell:

[0090]

[0091] S302: Calculate the total thickness of the interstage shell 7 :

[0092] .

[0093] Furthermore, step S6 includes the following steps:

[0094] S601: Calculate the axial hydraulic pressure of disc 5. :

[0095]

[0096] In the formula:

[0097] Indicates the absolute pressure of the lubricating oil pump;

[0098] This indicates the axial oil pressure action area of ​​the oil outlet chamber of the interstage housing 7;

[0099] S602: Determine the axial deformation of butterfly plate 5 based on its elastic curve. ;

[0100] S603: Set the pre-compression amount for a single butterfly disc 5 ;

[0101] S604: The pre-compression amount of the two individual butterfly plates 5 can be obtained as follows: ;

[0102] S605: Calculate the mounting thickness L7 of butterfly plate 5:

[0103]

[0104] In the formula:

[0105] This indicates the free height of a single butterfly blade 5.

[0106] Furthermore, the calculation formula for L8 mentioned in S8 is as follows:

[0107]

[0108] In the formula:

[0109] This indicates the preset reference value for the axial length of the lubricating pump housing.

[0110] Furthermore, the L mentioned in S10 内 The calculation formula is as follows:

[0111] .

[0112] Example 1:

[0113] S1: Determine the total thickness L4 of the inner and outer rotors (6);

[0114] S101: Calculate the thickness B of the single-stage inner and outer rotors (4):

[0115]

[0116] S102: Calculate the total thickness L4 of the inner and outer rotors (4):

[0117]

[0118] S2: Determine the total thickness L4' of the eccentric sleeve (8) = L4 = 28.8 mm;

[0119] S3: Determine the total thickness L5 of the interstage shell (7);

[0120] S301: An interstage housing (7) is required to separate the two-stage inner and outer rotors (4) to form an oil-sealing zone between the inner and outer rotors 4 and the interstage housing 7. Based on previous design experience with the interstage housing 7, the maximum thickness of the interstage housing 7 is half the sum of the thicknesses of the two-stage inner and outer rotors 4, i.e.: ,

[0121] The booster oil pump housing of this invention has a lot of pipes and accessories arranged around it. In order to avoid interference, the axial length of the oil pump housing is compressed as much as possible, and the thickness D of the single-stage interstage housing 7 is finally determined to be 6mm.

[0122] S302: The four-stage inner and outer rotors 4 require three-stage interstage housings 7 for separation, therefore the total thickness of the interstage housings 7 is... .

[0123] S4: Determine the thickness L6 of the top cover (4) based on past experience;

[0124] Both the upper cover 4 and the lower cover 3 have oil grooves at their inner ends for storing lubricating oil. The thickness of the upper cover (4) includes the depth of the upper cover oil groove and the minimum wall thickness. According to experience, the depth of the upper cover oil groove and the thickness of the recessed platform are both 3mm, and the minimum wall thickness is 5mm. Therefore, the thickness of the upper cover (4) L6 = 8mm.

[0125] During the design process, the end face of the oil groove of the upper cover (4) is flush with the end face of the oil storage groove of the oil pump housing. Therefore, the length of the oil storage groove in the inner hole of the lubricating oil pump housing is 28.8+18+3+3=52.8mm, which prevents the lubricating oil from being disturbed due to the presence of internal steps, thus affecting the performance of the lubricating oil pump.

[0126] The top cover also has a 3mm thick recessed platform.

[0127] S5: Determine the thickness L3 of the lower cover (3) based on past experience;

[0128] The other end of the lower cover 3 is a flat surface, used to place the adjusting shim 2 and bear the axial preload. The thickness of the lower cover 3 includes the depth of the lower cover oil groove and the minimum wall thickness, so the thickness of the lower cover 3 L3 = 3 + 5 = 8 mm;

[0129] S6: Determine the installation thickness L7 of the butterfly plate (5);

[0130] To avoid the axial clearance between the interstage housing 7 and the inner and outer rotors 4 increasing due to factors such as thermal expansion and contraction and oil pump pressure, and to ensure that all components are fixed in the axial position after the oil pump is assembled, axial clamping is ensured by disc plate (5).

[0131] Based on the radial dimensions of the components, a disc-shaped plate for the lubricating pump is selected. To avoid the deformation of the base caused by the elasticity of the disc-shaped plate 5, which would then affect the rotor end face clearance, two disc-shaped plates are used to form a disc-shaped plate assembly.

[0132] Since the oil pump housing, eccentric sleeve (8), and interstage housing (7) are all made of the same material 2A12, and their coefficients of linear expansion are the same, the influence of thermal expansion and contraction can be ignored.

[0133] S601: Calculate the axial hydraulic pressure of the disc (5). :

[0134]

[0135] S602: Based on the elastic curve of the disc plate, the axial deformation of disc plate 5 when the axial hydraulic pressure is 246N is: .

[0136] S603: Set the pre-compression amount of a single butterfly disc (5) ;

[0137] S604: The pre-compression amount of the two individual butterfly plates (5) can be obtained as follows: ;

[0138] Theoretically, the double-disc pre-compression This would meet the design requirements, but considering the impact of factors such as lubricating oil pump outlet pressure pulsation, assembly measurement errors, and operating vibration, and drawing on the development experience of other models, the pre-tightening amount of the disc assembly is controlled within... Within the range.

[0139] S605: The free height of a single butterfly piece (5) is 4mm, and the compression amount in the installation state is 0.4mm. This invention uses two butterfly pieces 5, and the compression amount in the installation state is 0.8mm. The height of the butterfly piece after installation is L7=8-0.8=7.2mm.

[0140] S7: Determine the thickness L2 of the retaining ring (1) to be 1.3mm.

[0141] S8: Determine the thickness L8 of the adjusting shim (2)

[0142] The axial dimensions of components such as the interstage housing 7, eccentric sleeve 8, and housing in each batch of lubricating pumps have tolerances, resulting in differences in axial dimensions between different batches after assembly. Since the compression amount of the disc 5 must be consistent after assembly, i.e., to ensure consistent axial clamping amount for each batch, an adjusting shim 2 is added axially. The axial force of the lubricating pump can be adjusted by machining the surface of the parts. The adjusting shim 2 works in conjunction with the disc 5 to ensure that the pre-compression amount of the disc 5 assembly is... .

[0143]

[0144] The design thickness of the adjusting shim 2 is H=5+0.15-0.15=4.85~5.15, H>L8. By further processing the adjusting shim 2, the compression of the disc can be met to be 0.5~0.8. Therefore, the axial dimension chain design of components such as the housing, disc, adjusting shim, and eccentric sleeve is reasonable and can meet the product design requirements.

[0145] S9: Generally, the distance L10 from the end face of the housing to the retaining ring groove is selected as 3mm.

[0146] S10: Determine the inner bore depth L of the lubricating pump housing 内 ;

[0147]

[0148] S11: Determine the wall thickness L of the lubricating oil pump housing 壁 ;

[0149] The wall thickness of a typical booster lubricating pump casing is not less than 5mm, therefore, the casing wall thickness L in this design is taken as... 壁 =5mm.

[0150] S12: Determine the total axial length L of the lubricating pump housing 总 =L内 +L 壁 =78+5=83mm.

[0151] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of the equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0152] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for determining the axial dimension chain of a booster lubricating oil pump housing for aero-engine research and development, characterized in that: The method includes the following steps: S1: Determine the total thickness L4 of the inner and outer rotors (6); S2: Determine the total thickness L4' of the eccentric sleeve (8); S3: Determine the total thickness L5 of the interstage shell (7); S4: Determine the thickness L6 of the top cover (4); S5: Determine the thickness L3 of the lower cover (3); S6: Determine the installation thickness L7 of the butterfly plate (5); S7: Determine the thickness L2 of the retaining ring (1); S8: Determine the thickness L8 of the adjusting shim (2); S9: Determine the distance L10 between the retaining ring groove and the end face of the housing; S10: Determine the inner bore depth L of the lubricating pump housing 内 ; S11: Determine the wall thickness L of the lubricating oil pump housing 壁 ; S12: Determine the total axial length L of the lubricating pump housing 总 =L 内 +L 壁 .

2. The method for determining the axial dimension chain of a booster lubricating oil pump housing for aero-engine research and development according to claim 1, characterized in that: S1 includes the following steps: S101: Calculate the thickness B of the single-stage inner and outer rotors (4): In the formula: This indicates that the host protocol requires a given traffic value; The volumetric efficiency of the inner and outer rotors (4) is indicated; This represents the area of ​​the inner and outer rotors (4); Indicates the number of teeth on the inner and outer rotors (4); Indicates the rated speed of the inner and outer rotors (4); S102: Calculate the total thickness L4 of the inner and outer rotors (4): In the formula: This indicates the number of stages of the inner and outer rotors (4).

3. The method for determining the axial dimension chain of a booster lubricating oil pump housing for aero-engine research and development according to claim 2, characterized in that: S3 includes the following steps: S301: Calculate the thickness D of the single-stage interstage shell (7): S302: Calculate the total thickness of the interstage shell (7) : 。 4. The method for determining the axial dimension chain of a booster lubricating oil pump housing for aero-engine research and development according to claim 3, characterized in that: S6 includes the following steps: S601: Calculate the axial hydraulic pressure of the disc (5). : In the formula: Indicates the absolute pressure of the lubricating oil pump; This indicates the axial oil pressure action area of ​​the oil outlet chamber of the interstage housing (7); S602: Determine the axial deformation of the butterfly plate (5) based on its elastic curve. ; S603: Set the pre-compression amount of a single butterfly disc (5) ; S604: The pre-compression amount of the two individual butterfly plates (5) can be obtained as follows: ; S605: Calculate the mounting thickness L7 of the butterfly plate (5): In the formula: This indicates the free height of a single butterfly blade (5).

5. The method for determining the axial dimension chain of a booster lubricating oil pump housing for aero-engine research and development according to claim 4, characterized in that: The calculation formula for L8 mentioned in S8 is as follows: In the formula: This indicates the preset reference value for the axial length of the lubricating pump housing.

6. The method for determining the axial dimension chain of a booster lubricating oil pump housing for aero-engine research and development according to claim 5, characterized in that: S10 L 内 The calculation formula is as follows: 。

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