Assembly method of double-positioning rigid sealing pipeline

Abstract

The present invention relates to the technical field of aviation engine oil seals, and in particular to an assembly method for a dual-positioning rigid sealing pipeline. The method comprises the following steps: S1, grinding the mating planes: grinding the mating planes of the mounting seat and the oil pipe respectively; S2, applying aluminum powder heat-resistant paint: applying aluminum powder heat-resistant paint on the mating planes of the mounting seat and the oil pipe respectively; S3, assembling the rigid mating end of the oil pipe: installing the oil pipe in the hollow inner hole of the support so that the mating surface of the right end of the oil pipe is aligned with the mating surface of the mounting seat, and assembling a locking plate and a screw; S4, machining the outer cylindrical surface of the left end of the oil pipe: machining the outer cylindrical surface of the left end of the oil pipe using electric sparks to ensure that the outer cylindrical surface of the left end of the oil pipe is coaxial with the inner hole of the mounting platform; S5, assembling the bushing assembly: sleeve the bushing assembly on the outer cylindrical surface of the left end of the oil pipe; S6, adjusting the state of the bushing assembly: adjusting the position of the bushing assembly so that the bushing assembly is coaxial with the inner hole of the mounting platform; S7, assembling the adapter pipe.

Description

Technical Field

[0001] The invention relates to the technical field of aviation engine lubricating oil seals, and in particular to an assembly method for a double-positioning rigid sealing pipeline. Background Art

[0002] In traditional sealing structures, sealing is often achieved by assembling gaskets and rubber rings on the mating surfaces of parts. However, in the sealing structure of aircraft engine lubricating oil lines, the sealing conditions cannot be achieved using gaskets due to high temperatures and cleanliness requirements.

[0003] Combine Figure 1 As shown, a pillar 13 is provided on the mounting seat 1, and the lubricating oil pipe 2 needs to be installed in the hollow inner hole of the pillar 13, and the right end of the lubricating oil pipe 2 needs to be rigidly contacted and sealed with the mounting seat 1, and then the transfer tube 9 and the bushing assembly are installed on the mounting platform 11 at the left end of the pillar 13, and the bushing assembly is sleeved on the outer cylindrical surface of the left end of the lubricating oil pipe 2.

[0004] Since the right end of the oil pipe 2 is fastened to the mounting seat 1 by screws, it is easy for the left end of the oil pipe 2 to be not coaxial with the inner hole of the mounting platform 11. Therefore, after the bushing assembly is assembled, the bushing assembly forms a force on the oil pipe 2, and the direction of the force is perpendicular to the axis of the oil pipe 2, resulting in assembly stress at the connection between the right end of the oil pipe 2 and the mounting seat 1, which can easily cause leakage in the rigid mating surface contact seal formed at the connection. Summary of the Invention

[0005] The main purpose of the present invention is to provide an assembly method for a double-positioning rigid sealing pipeline, aiming to solve the above technical problems.

[0006] To achieve the above object, the present invention provides a method for assembling a dual-position rigid sealing pipeline, comprising the following steps:

[0007] S1. Grinding the mating surfaces: Grind the mating surfaces of the mounting seat and the oil pipe respectively;

[0008] S2. Apply aluminum powder heat-resistant paint: Apply aluminum powder heat-resistant paint on the matching surfaces of the mounting seat and the lubricating oil pipe respectively;

[0009] S3. Assemble the rigid mating end of the oil pipe: Install the oil pipe into the hollow inner hole of the strut, ensuring that the mating surface of the right end of the oil pipe aligns with the mating surface of the mounting seat. Install the locking plate and screws, but do not tighten the screws yet. Pre-assemble the bushing assembly onto the outer cylindrical surface of the left end of the oil pipe and preliminarily tighten the screws. Remove the pre-assembled bushing assembly and finally tighten the screws.

[0010] S4. Process the outer cylindrical surface of the left end of the oil pipe: Use electric spark to process the outer cylindrical surface of the left end of the oil pipe to ensure that the outer cylindrical surface of the left end of the oil pipe is coaxial with the inner hole of the mounting platform;

[0011] S5. Assemble the bushing assembly: Slide the bushing assembly onto the outer cylindrical surface of the left end of the oil pipe;

[0012] S6. Adjust the state of the bushing assembly: adjust the position of the bushing assembly so that the bushing assembly is coaxial with the inner hole of the mounting table;

[0013] S7. Assemble the adapter: Assemble the adapter on the mounting table.

[0014] Preferably, the bushing assembly includes a bushing, and a rubber ring, an annular gasket and a clamping nut arranged inside the bushing; an annular stop is provided at the right end opening of the inner hole of the bushing; a bushing flange is integrally formed on the outer cylindrical surface of the left end of the bushing; the right end of the rubber ring rests on the annular stop, the clamping nut is screwed onto the internal thread of the center hole of the bushing, and the annular gasket is located between the clamping nut and the rubber ring.

[0015] Preferably, in step S1, when grinding the matching planes of the mounting seat and the lubricating oil pipe respectively, a colorant is used to check the colored area on a platform with an accuracy of 0.003 mm, and the colored area is not less than 90% and the entire outer contour is continuous and uninterrupted.

[0016] Preferably, in step S2, the aluminum powder heat-resistant paint is applied twice. After applying the first coat of aluminum powder heat-resistant paint and drying it at room temperature for 30 minutes, the second coat is applied and dried at room temperature for 2 hours.

[0017] Preferably, in step S2, the temperature during drying is required to be 20° C. to 25° C., and the humidity is required to be 45% to 60%.

[0018] Preferably, in step S3, when the bushing assembly is pre-assembled, the compression nut is screwed into the bushing at 1 N·m. After the pre-assembled bushing assembly is inserted into the outer cylindrical surface of the left end of the lubricating oil pipe, the screws are tightened symmetrically in the order of 1 N·m and 5 N·m. After the pre-assembled bushing assembly is removed, the screws are tightened symmetrically in the order of 8 N·m and 10 N·m to the final torque.

[0019] Preferably, in step S4, when electrospark machining the outer cylindrical surface of the left end of the lubricating oil pipe, the inner hole on the mounting platform for matching with the bushing assembly is aligned, and electrospark machining removes 0.5mm of the excess outer cylindrical surface of the left end of the lubricating oil pipe to ensure that the coaxiality of the outer cylindrical surface of the left end of the lubricating oil pipe and the inner hole of the mounting platform is ≤φ0.1mm.

[0020] Preferably, in step S5, when assembling the bushing assembly, the rubber ring and the annular gasket are sequentially installed into the bushing, and the clamping nut is screwed into the bushing with a tightening torque of 1 N·m; the bushing assembly is inserted into the inner hole of the mounting table so that the rubber ring cooperates with the outer cylindrical surface of the left end of the lubricating oil pipe, and the clamping nut is tightened to 10 N·m.

[0021] Preferably, in step S6, there is a gap of 1 mm between the inner hole of the mounting table and the outer cylindrical surface of the bushing, and the assembled bushing is moved up, down, left and right. When the right end of the lubricating oil pipe is fixed, the bushing at the left end of the lubricating oil pipe swings freely in the inner hole of the mounting table without interference or constraint. After being stationary, the bushing is coaxial with the inner hole of the mounting table.

[0022] Preferably, in step S7, when assembling the adapter tube, the bushing flange of the bushing rests against the left end face of the mounting platform, a sealing gasket is assembled between the outer end face of the bushing flange and the flange plate of the adapter tube, the flange plate of the adapter tube is connected to the mounting platform by a bolt assembly, and the nut on the bolt assembly is tightened to 8 N·m.

[0023] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0024] (1) By adopting the assembly method provided by the present invention, the reliability of the rigid contact seal between the right end of the lubricating oil pipe and the mounting seat can be ensured, and the problem of rigid mating surface contact seal leakage caused by assembly stress during the assembly process can be effectively solved.

[0025] (2) By adopting the assembly method provided by the present invention and using a pseudo-assembly bushing assembly, it can be preliminarily ensured that the outer cylindrical surface of the left end of the oil pipe is substantially coaxial with the inner hole of the mounting platform when the right end of the oil pipe is fixed. Then, by aligning the inner hole on the mounting platform for matching the bushing assembly, the outer cylindrical surface of the left end of the oil pipe is processed by electric spark machining, thereby ensuring the coaxiality of the outer cylindrical surface of the left end of the oil pipe with the inner hole of the mounting platform.

[0026] (3) In the present invention, by coating aluminum powder heat-resistant paint, the microscopic surface depressions on the planes where the mounting seat and the lubricating oil pipe match can be filled, thereby ensuring the sealing of the rigid fitting contact formed by the mounting seat and the lubricating oil pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0028] Figure 1 This is a schematic diagram of the structure of the lubricating oil pipe after installation in the present invention;

[0029] Figure 2 for Figure 1 Middle B-direction view;

[0030] Figure 3 for Figure 1 A partial enlarged view of point D in the middle;

[0031] Figure 4 This is a schematic diagram of the structure when the bushing assembly and adapter are not assembled.

[0032] Explanation of the accompanying figures: 1. Mounting seat; 2. Lubricating oil pipe; 3. Bushing; 3a. Annular stopper; 3b. Bushing flange; 4. Rubber ring; 5. Annular gasket; 6. Compression nut; 7. Locking plate; 8. Screw; 9. Adapter tube; 10. Bolt assembly; 11. Mounting platform; 12. Sealing gasket; 13. Pillar. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] Combine Figures 1 to 4 As shown, a method for assembling a dual-position rigid sealing pipeline includes the following steps:

[0036] S1. Grind the joint surface: Grind the joint surface of the mounting seat 1 and the lubricating oil pipe 2 respectively. The joint surface of the mounting seat 1 and the lubricating oil pipe 2 is as follows: Figure 1 In the figure, the reference numeral C is used;

[0037] S2. Apply aluminum powder heat-resistant paint: Apply aluminum powder heat-resistant paint on the matching surfaces of the mounting seat 1 and the lubricating oil pipe 2 respectively;

[0038] S3. Assemble the rigid mating end of the oil pipe 2: Install the oil pipe 2 in the hollow inner hole of the pillar 13, so that the mating surface of the right end of the oil pipe 2 is aligned with the mating surface of the mounting seat 1. Install the locking plate 7 and screw 8, but do not tighten the screw 8 yet. Pre-assemble the bushing assembly on the outer cylindrical surface F of the left end of the oil pipe 2 and preliminarily tighten the screw 8. After removing the pre-assembled bushing assembly, finally tighten the screw 8.

[0039] S4. Machining the outer cylindrical surface F of the left end of the oil pipe 2: Use electric spark to machine the outer cylindrical surface F of the left end of the oil pipe 2 to ensure that the outer cylindrical surface F of the left end of the oil pipe 2 is coaxial with the inner hole E of the mounting platform 11;

[0040] S5. Assemble the bushing assembly: Sleeve the bushing assembly onto the outer cylindrical surface F at the left end of the oil pipe 2;

[0041] S6. Adjust the state of the bushing assembly: adjust the position of the bushing assembly so that the bushing assembly is coaxial with the inner hole E of the mounting platform 11;

[0042] S7 , assembling the adapter tube 9 : assembling the adapter tube 9 on the mounting platform 11 .

[0043] Combine Figure 3 As shown, the bushing assembly includes a bushing 3, and a rubber ring 4, an annular gasket 5 and a clamping nut 6 arranged inside the bushing 3; an annular stop 3a is provided at the right end opening of the inner hole of the bushing 3; the outer cylindrical surface of the left end of the bushing 3 is integrally formed with a bushing flange 3b; the right end of the rubber ring 4 rests on the annular stop 3a, the clamping nut 6 is screwed onto the internal thread of the center hole of the bushing 3, and the annular gasket 5 is located between the clamping nut 6 and the rubber ring 4.

[0044] In order to ensure the progress of the matching planes of the mounting seat 1 and the lubricating oil pipe 2, it is required that in step S1, when grinding the matching planes of the mounting seat 1 and the lubricating oil pipe 2 respectively, the colored area should be checked using a colorant on a platform with an accuracy of 0.003mm. The colored area should be no less than 90% and the entire outer contour should be continuous and uninterrupted.

[0045] In step S2, the aluminum powder heat-resistant paint is applied twice. After the first coat is applied, the paint is allowed to dry at room temperature for 30 minutes, followed by a second coat, which is then allowed to dry at room temperature for 2 hours. The drying temperature is required to be 20°C to 25°C, and the humidity is required to be 45% to 60%. The application of the aluminum powder heat-resistant paint fills the microscopic surface depressions on the mating surfaces of the mounting base 1 and the lubricating oil pipe 2, ensuring the sealing of the rigid contact formed between the mounting base 1 and the lubricating oil pipe 2.

[0046] In step S3, when the bushing assembly is pre-assembled, the compression nut 6 is screwed into the bushing 3 at 1 N·m. After the pre-assembled bushing assembly is inserted into the outer cylindrical surface F of the left end of the lubricating oil pipe 2, the screws 8 are tightened symmetrically in the order of 1 N·m and 5 N·m. After the pre-assembled bushing assembly is removed, the screws 8 are tightened symmetrically in the order of 8 N·m and 10 N·m to the final torque.

[0047] In step S4, when the outer cylindrical surface of the left end of the lubricating oil pipe 2 is electrospark machined, the inner hole E on the mounting table 11 for matching with the bushing assembly is aligned, and the electrospark machined removes 0.5mm of the outer cylindrical surface F of the left end of the lubricating oil pipe 2 to ensure that the coaxiality of the outer cylindrical surface F of the left end of the lubricating oil pipe 2 and the inner hole E of the mounting table 11 is ≤φ0.1mm.

[0048] In step S5, when assembling the bushing assembly, the rubber ring 4 and the annular gasket 5 are sequentially installed into the bushing 3, and the clamping nut 6 is screwed into the bushing 3 with a tightening torque of 1 N·m; the bushing assembly is inserted into the inner hole E of the mounting platform 11 so that the rubber ring 4 cooperates with the outer cylindrical surface F of the left end of the lubricating oil pipe 2, and the clamping nut 6 is tightened to 10 N·m.

[0049] In step S6, there is a gap of 1 mm between the inner hole E of the mounting platform 11 and the outer cylindrical surface of the bushing 3. The assembled bushing 3 is moved up and down and left and right. When the right end of the lubricating oil pipe 2 is fixed, the bushing 3 at the left end of the lubricating oil pipe 2 swings freely in the inner hole E of the mounting platform 11 without interference or constraint. After it stops, the bushing 3 is coaxial with the inner hole of the mounting platform 11.

[0050] In step S7, when assembling the adapter tube 9, the bushing flange 3b of the bushing 3 abuts against the left end face of the mounting platform 11, and a sealing gasket 12 is assembled between the outer end face of the bushing flange 3b and the flange plate of the adapter tube 9. The flange plate of the adapter tube 9 and the mounting platform 11 are connected by a bolt assembly 10. The studs on the bolt assembly 10 pass through the flange plate of the adapter tube 9, the sealing gasket 12, and the bushing flange 3b in sequence and are screwed onto the end face of the mounting platform 11. There are four groups of bolt assemblies 10. The nuts on the bolt assemblies 10 are tightened to 8 N·m, and a symmetrical tightening method is adopted when tightening.

[0051] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A method for assembling a double-positioned rigid sealing pipeline, characterized in that: The steps include: S1. Grinding the mating plane: Grinding the mating planes of the mounting seat (1) and the lubricating oil pipe (2) respectively; S2. Applying aluminum powder heat-resistant paint: Applying aluminum powder heat-resistant paint on the matching planes of the mounting seat (1) and the lubricating oil pipe (2); S3. Assemble the rigid mating end of the oil pipe (2): install the oil pipe (2) in the hollow inner hole of the pillar (13) so that the mating surface of the right end of the oil pipe (2) is in contact with the mating surface of the mounting seat (1) and assemble the locking plate (7) and the screw (8), without tightening the screw (8) first; pre-assemble the bushing assembly on the outer cylindrical surface of the left end of the oil pipe (2) and preliminarily tighten the screw (8); remove the pre-assembled bushing assembly and finally tighten the screw (8); S4. Processing the outer cylindrical surface of the left end of the oil pipe (2): using electric sparks to process the outer cylindrical surface of the left end of the oil pipe (2) to ensure that the outer cylindrical surface of the left end of the oil pipe (2) is coaxial with the inner hole of the mounting platform (11); S5. Assemble the bushing assembly: sleeve the bushing assembly onto the outer cylindrical surface of the left end of the lubricating oil pipe (2); S6. Adjusting the state of the bushing assembly: adjusting the position of the bushing assembly so that the bushing assembly is coaxial with the inner hole of the mounting platform (11); S7, assembling the transfer tube (9): assembling the transfer tube (9) on the mounting platform (11).

2. The method for assembling a double-position rigid sealing pipeline according to claim 1, characterized in that: The bushing assembly comprises a bushing (3), a rubber ring (4), an annular pad (5) and a clamping nut (6) arranged inside the bushing (3); an annular stop (3a) is provided at the right end opening of the inner hole of the bushing (3); a bushing flange (3b) is integrally formed on the outer cylindrical surface of the left end of the bushing (3); the right end of the rubber ring (4) abuts against the annular stop (3a), the clamping nut (6) is screwed onto the internal thread of the central hole of the bushing (3), and the annular pad (5) is located between the clamping nut (6) and the rubber ring (4).

3. The method for assembling a double-position rigid sealing pipeline according to claim 1, characterized in that: In step S1, when respectively grinding the matching planes of the mounting seat (1) and the lubricating oil pipe (2), a colorant is used to check the coloring area on a platform with an accuracy of 0.003 mm. The coloring area is not less than 90% and the entire outer contour is continuous and uninterrupted.

4. The method for assembling a dual-position rigid sealing pipeline according to claim 1, wherein: In step S2, the aluminum powder heat-resistant paint is applied twice. After applying the first coat of aluminum powder heat-resistant paint and drying it at room temperature for 30 minutes, the second coat is applied and dried at room temperature for 2 hours.

5. The method for assembling a double-position rigid sealing pipeline according to claim 4, characterized in that: In step S2, the temperature during drying is required to be 20° C. to 25° C., and the humidity is required to be 45% to 60%.

6. The method for assembling a dual-position rigid sealing pipeline according to claim 2, characterized in that: In step S3, when the bushing assembly is pre-assembled, the compression nut (6) is screwed into the bushing (3) at 1 N·m, and after the pre-assembled bushing assembly is inserted into the outer cylindrical surface of the left end of the lubricating oil pipe (2), the screws (8) are tightened symmetrically in the order of 1 N·m and 5 N·m. After the pre-assembled bushing assembly is removed, the screws (8) are tightened symmetrically in the order of 8 N·m and 10 N·m to the final torque.

7. The method for assembling a dual-position rigid sealing pipeline according to claim 1, characterized in that: In step S4, when the outer cylindrical surface of the left end of the lubricating oil pipe (2) is electrospark machined, the inner hole on the mounting platform (11) for matching with the bushing assembly is aligned, and the electrospark machined removes 0.5 mm of the outer cylindrical surface of the left end of the lubricating oil pipe (2) to ensure that the coaxiality of the outer cylindrical surface of the left end of the lubricating oil pipe (2) and the inner hole of the mounting platform (11) is ≤ φ0.1 mm.

8. The method for assembling a dual-position rigid sealing pipeline according to claim 2, wherein: In step S5, when assembling the bushing assembly, the rubber ring (4) and the annular spacer (5) are sequentially installed into the bushing (3), and the clamping nut (6) is screwed into the bushing (3) with a tightening torque of 1 N·m; the bushing assembly is inserted into the inner hole of the mounting platform (11) so that the rubber ring (4) is matched with the outer cylindrical surface of the left end of the lubricating oil pipe (2), and the clamping nut (6) is tightened to 10 N·m.

9. The method for assembling a dual-position rigid sealing pipeline according to claim 2, characterized in that: In step S6, there is a gap of 1 mm between the inner hole of the mounting platform (11) and the outer cylindrical surface of the bushing (3), and the assembled bushing (3) is moved up and down and left and right. When the right end of the lubricating oil pipe (2) is fixed, the bushing (3) at the left end of the lubricating oil pipe (2) swings freely in the inner hole of the mounting platform (11) without interference or constraint. After being stationary, the bushing (3) is coaxial with the inner hole of the mounting platform (11).

10. The method for assembling a dual-position rigid sealing pipeline according to claim 2, wherein: In the step S7, when assembling the transfer tube (9), the bushing flange (3b) of the bushing (3) abuts against the left end surface of the mounting platform (11), a sealing gasket (12) is assembled between the outer end surface of the bushing flange (3b) and the flange plate of the transfer tube (9), the flange plate of the transfer tube (9) and the mounting platform (11) are connected by a bolt assembly (10), and the nut on the bolt assembly (10) is tightened to 8N·m.

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