Assembling method of double-positioning rigid sealing pipeline

Abstract

The invention relates to the technical field of aero-engine lubricating oil sealing, in particular to an assembling method of a double-positioning rigid sealing pipeline. Comprising the following steps: S1, grinding a combined plane, namely respectively grinding matched planes of a mounting seat and a lubricating oil pipe; s2, aluminum powder heat-resistant paint is coated, specifically, the matched planes of the mounting base and the lubricating oil pipe are coated with the aluminum powder heat-resistant paint correspondingly; s3, assembling a rigid matching end of a lubricating oil pipe: mounting the lubricating oil pipe in a hollow inner hole of the support column, so that a matching surface at the right end of the lubricating oil pipe is attached to a matching 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 lubricating oil pipe: machining the outer cylindrical surface of the left end of the lubricating oil pipe by using electric sparks to ensure that the outer cylindrical surface of the left end of the lubricating oil pipe is coaxial with the inner hole of the mounting table; s5, a lining assembly is assembled, specifically, the outer cylindrical surface of the left end of the lubricating oil pipe is sleeved with the lining assembly; s6, the state of the bushing assembly is adjusted, specifically, the position of the bushing assembly is adjusted, so that the bushing assembly is coaxial with the inner hole of the mounting table; and S7, the adapter pipe is assembled.

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, rubber rings, etc. on the mating surfaces of parts. However, in the sealing structure of aircraft engine lubricating oil pipelines, sealing conditions cannot be achieved using sealing gaskets due to high temperature and cleanliness requirements.

[0003] Combination 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 to cause 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 is easy to cause leakage of 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 double-positioning rigid sealing pipeline, comprising the following steps:

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

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

[0009] S3. Assemble the rigid mating end of the lubricating oil pipe: install the lubricating oil pipe in the hollow inner hole of the pillar so that the mating surface of the right end of the lubricating oil pipe is in contact with the mating surface of the mounting seat, and assemble the locking plate and the screw without tightening the screw first; pre-assemble the bushing assembly on the outer cylindrical surface of the left end of the lubricating oil pipe, and preliminarily tighten the screw; after removing the pre-assembled bushing assembly, finally tighten the screw;

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

[0011] S5. Assemble the bushing assembly: sleeve the bushing assembly onto the outer cylindrical surface of the left end of the lubricating 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 baffle is arranged 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 abuts against the annular baffle, 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 respectively grinding the matching planes of the mounting seat and the lubricating oil pipe, a coloring agent is used to check the coloring area on a platform with an accuracy of 0.003 mm, and the coloring 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, a 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, and 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, and 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 the outer cylindrical surface of the left end of the lubricating oil pipe is electrospark machined, the inner hole on the mounting platform for matching with the bushing assembly is aligned, and the 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, the bushing flange of the bushing abuts 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, the flange plate of the adapter 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 rigid mating surface contact seal leakage problem 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 by 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 basically 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 that matches 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 matching planes of the mounting seat and the lubricating oil pipe can be filled, thereby ensuring the sealing of the rigid matching 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 drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

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

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

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

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

[0032] Explanation of the accompanying drawings: 1. Mounting seat; 2. Lubricating oil pipe; 3. Bushing; 3a. Annular baffle; 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 be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are 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 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] Combination Figures 1 to 4 As shown, a method for assembling a dual-position rigid sealing pipeline comprises the following steps:

[0036] S1. Grinding the joint surface: Grind the matching planes 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. 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 respectively;

[0038] S3. Assemble the rigid mating end of the lubricating oil pipe 2: install the lubricating oil pipe 2 in the hollow inner hole of the pillar 13, so that the mating surface of the right end of the lubricating 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, but do not tighten the screw 8 first; pre-assemble the bushing assembly on the outer cylindrical surface F of the left end of the lubricating 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 at the left end of the lubricating oil pipe 2: using electric sparks to machine the outer cylindrical surface F at the left end of the lubricating oil pipe 2 to ensure that the outer cylindrical surface F at the left end of the lubricating oil pipe 2 is coaxial with the inner hole E of the mounting platform 11;

[0040] S5, assembling the bushing assembly: sleeve the bushing assembly onto the outer cylindrical surface F at the left end of the lubricating oil pipe 2;

[0041] 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 E of the mounting platform 11;

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

[0043] Combination 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 stopper 3a is arranged 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 stopper 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 the step S1, when respectively grinding the matching planes of the mounting seat 1 and the lubricating oil pipe 2, a colorant be used to check the coloring area on a platform with an accuracy of 0.003mm, and the coloring area shall not be less than 90% and the entire circle of the outer contour shall be continuous and uninterrupted.

[0045] In step S2, the aluminum powder heat-resistant paint is applied twice. After the first coat of aluminum powder heat-resistant paint is applied, it is dried at room temperature for 30 minutes, and then the second coat is applied and dried at room temperature for 2 hours. The temperature during drying is required to be 20°C to 25°C, and the humidity is required to be 45% to 60%. By applying the aluminum powder heat-resistant paint, the microscopic surface depressions on the planes where the mounting seat 1 and the lubricating oil pipe 2 match can be filled, thereby ensuring the sealing of the rigid matching contact formed by the mounting seat 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 machining removes 0.5mm of the excess 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 at 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, down, 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 being stationary, the bushing 3 is coaxial with the inner hole of the mounting platform 11.

[0050] In the 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 the 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 is connected to the mounting platform 11 through 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 used for 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. All equivalent structural changes 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 are included in the patent protection scope of the present invention.

Claims

1. A method for assembling a double-position rigid sealing pipeline, characterized in that: The steps include: S1, grinding the mating plane: respectively grinding the mating planes of the mounting seat (1) and the lubricating oil pipe (2); S2, coating with aluminum powder heat-resistant paint: coating with aluminum powder heat-resistant paint on the matching planes of the mounting seat (1) and the lubricating oil pipe (2); S3, assembling the rigid mating end of the lubricating oil pipe (2): installing the lubricating oil pipe (2) in the hollow inner hole of the pillar (13) so that the mating surface of the right end of the lubricating oil pipe (2) is in contact with the mating surface of the mounting seat (1), and assembling the locking plate (7) and the screw (8), but not tightening the screw (8) first; assembling the bushing assembly on the outer cylindrical surface of the left end of the lubricating oil pipe (2), and preliminarily tightening the screw (8); after removing the assembling bushing assembly, finally tightening the screw (8); S4, processing the outer cylindrical surface of the left end of the lubricating oil pipe (2): using electric spark to process the outer cylindrical surface of the left end of the lubricating oil pipe (2) to ensure that the outer cylindrical surface of the left end of the lubricating oil pipe (2) is coaxial with the inner hole of the mounting platform (11); S5. Assembling 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. A method for assembling a double-position rigid sealing pipeline as claimed in claim 1, characterized in that: The bushing assembly comprises a bushing (3), a rubber ring (4), an annular gasket (5) and a clamping nut (6) arranged inside the bushing (3); an annular stopper (3a) is arranged 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) abuts against the annular stopper (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).

3. The method for assembling a double-position rigid sealing pipeline according to claim 1, characterized in that: In step S1, when grinding the matching planes of the mounting seat (1) and the lubricating oil pipe (2) respectively, 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. A method for assembling a double-position rigid sealing pipeline as claimed in claim 1, characterized in that: 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. A method for assembling a double-position rigid sealing pipeline as claimed in 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. A method for assembling a double-position rigid sealing pipeline as claimed in 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. A method for assembling a double-position rigid sealing pipeline as claimed in 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. A method for assembling a double-position rigid sealing pipeline as claimed in claim 2, characterized in that: 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 of the mounting platform (11) so that the rubber ring (4) matches 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. A method for assembling a double-position rigid sealing pipeline as claimed in 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). The assembled bushing (3) is moved up, down, 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 double-position rigid sealing pipeline according to claim 2, characterized in that: In the step S7, when assembling the adapter 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 adapter tube (9), the flange plate of the adapter tube (9) is connected to the mounting platform (11) via a bolt assembly (10), and the nut on the bolt assembly (10) is tightened to 8 N·m.

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