Pull rod fixing structure of aircraft high-temperature air entraining pipe

Abstract

The invention relates to the technical field of aircraft high-temperature air entraining pipelines, in particular to a pull rod fixing structure of an aircraft high-temperature air entraining pipe. Fixing structures are arranged on the two sides of the high-temperature air entraining pipeline, each fixing structure comprises a pull rod assembly and a fixing base, and the two ends of each pull rod assembly are connected with the high-temperature air entraining pipeline and the corresponding fixing base through knuckle bearings correspondingly; the pull rod assembly comprises a connecting rod located in the middle and pull rods located on the two sides, the ends, away from the connecting rod, of the two pull rods are both connected with a knuckle bearing, the two ends of the connecting rod are both fixedly connected with connecting rod end locking pieces, and the two pull rods are in threaded connection with the two ends of the connecting rod correspondingly and are slidably connected with pull rod end locking pieces. And each pull rod is in threaded connection with a nut.

Description

Technical Field

[0001] The invention relates to the technical field of aircraft high-temperature air bleed pipes, and in particular to a tie rod fixing structure of an aircraft high-temperature air bleed pipe. Background Art

[0002] There are a large number of high-temperature bleed air pipes for aircraft and aero engines. The diameter of such pipes is large and cannot be fixed with conventional P-type clamps with rubber gaskets. Saddle clamps or tie rods are generally used for fixing. Saddle clamps need to be fixed on the bracket, and the bracket takes up a lot of space. Tie rods are generally in the form of fixed-length tie rods and threaded tie rods. Fixed-length tie rods are tie rods that are processed in place at one time according to the designed length. Threaded tie rods generally use 2 tie rods threaded connection, or 3 tie rods threaded connection.

[0003] Fixed-length tie rods do not have the function of adjusting the length, and require high processing precision, high manufacturing costs, are relatively difficult to install, and do not compensate for thermal deformation of the pipeline. Threaded tie rods have the ability to adjust the length, but often only have one threaded connection locking function, which poses the risk of threaded connection failure causing pipeline fixation failure. Moreover, commonly used threaded tie rods do not have the functions of pipeline thermal compensation and pipeline vibration reduction after installation. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the deficiencies in the prior art, the present invention provides a tie rod fixing structure for a high-temperature air bleed duct of an aircraft.

[0006] (II) Technical solution

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a tie rod fixing structure for an aircraft high-temperature air bleed duct, comprising a high-temperature air bleed duct; a fixing structure is arranged on both sides of the high-temperature air bleed duct, the fixing structure comprising a tie rod assembly and a fixing seat, and the two ends of the tie rod assembly are respectively connected to the high-temperature air bleed duct and the fixing seat through joint bearings; the tie rod assembly comprises a connecting rod in the middle and tie rods on both sides, the two tie rods are connected to joint bearings at one end away from the connecting rod, both ends of the connecting rod are fixedly connected with connecting rod end locking plates, the two tie rods are respectively threadedly connected to the two ends of the connecting rod, the tie rods are slidably connected with the tie rod end locking plates, and each tie rod is threadedly connected with a nut.

[0008] Furthermore, the present invention is improved in that both ends of the pull rod are provided with slots, and the locking piece at the connecting rod end includes a protrusion extending into the slot and a ring body connected to the protrusion.

[0009] Furthermore, the present invention is improved in that a shallow groove is provided on the surface of the pull rod along its axial direction, and the locking piece at the end of the pull rod includes two protrusions extending into the shallow groove and two ring bodies connected to the two protrusions.

[0010] Furthermore, the present invention is improved in that the ring body 1 and the ring body 2 are both provided with teeth on one side close to the other.

[0011] Furthermore, the present invention is improved in that the threads on both sides of the pull rod are opposite.

[0012] Furthermore, the present invention is improved in that the middle of the connecting rod is made of a deformable material.

[0013] Furthermore, the present invention is improved in that the nut is provided with a first locking wire hole, the locking plate at the end of the connecting rod is provided with a second locking wire hole, and the first locking wire hole and the second locking wire hole are provided with fuses.

[0014] Furthermore, the present invention is improved in that the spherical bearing is connected to the fixing seat and the high-temperature air bleed pipeline by fixing bolts and fixing nuts.

[0015] (III) Beneficial effects

[0016] Compared with the prior art, the present invention provides a tie rod fixing structure for a high-temperature bleed air duct of an aircraft, which has the following beneficial effects: the pipeline connection structure of the present invention occupies a small space, adopts a tie rod form of a corrugated tube, the tie rod itself has high strength, has a certain deformation ability, has a certain elongation and contraction ability after the tie rod is heated, has a thermal compensation effect, can compensate for the thermal stress of the pipeline connection, and also plays a role in compensating for the pipeline vibration. At the same time, the tie rod has the ability to adjust the axial length and swing around the inner ring of the spherical bearing, which has a compensation effect on assembly and manufacturing errors, and can compensate for pipeline vibration and release stress. The present invention adopts a multi-channel locking structure, and the connection is more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention;

[0018] Figure 2 is a schematic diagram of the structure of the tie rod assembly;

[0019] Figure 3 is a cross-sectional view of a portion of the tie rod assembly;

[0020] Figure 4 It is a schematic diagram of the structure of the locking wire hole one and the locking wire hole two. DETAILED DESCRIPTION

[0021] 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.

[0022] The present invention is a tie rod fixing structure for a high temperature air bleed pipe of an aircraft. The high temperature air bleed pipe 5 is fixed as follows: Figure 1 As shown, it mainly includes a tie rod assembly 1, a fixing seat 2, a fixing bolt 3, a fixing nut 4 and a high-temperature air bleed pipe 5;

[0023] The tie rod assembly 1 includes a connecting rod 11, two tie rods, two hexagonal nuts, a tie rod end locking piece 16 and a connecting rod end locking piece 17. Figure 2 As shown, the two tie rods include a left-hand tie rod 12 and a right-hand tie rod 13, the two hexagonal nuts include a left-hand hexagonal nut 14 and a right-hand hexagonal nut 15, the connecting rod end locking piece 17 includes a protrusion 171 extending into the slot and a ring body 1 connected to the protrusion 171, and the tie rod end locking piece 16 includes a protrusion 161 extending into the shallow groove 1231 and a ring body 2 connected to the protrusion 161;

[0024] The middle of the connecting rod 11 is made of a deformable material, more specifically, it can be a bellows or a spring, etc., which has a certain deformation ability. When the connecting rod 11 is heated, the bellows has a certain extension and contraction ability, which plays a role in thermal compensation. The two ends of the connecting rod 11 are threaded structures for connection, one end is a left-handed thread, and the other end is a right-handed thread. The two ends of the connecting rod 11 are provided with grooves 111 for fixing with the locking plate 17 at the connecting rod end. More specifically, a protrusion 171 of the locking plate 17 at the connecting rod end extends into the groove 111.

[0025] Joint bearings are installed inside the left-handed tie rod 12 and the right-handed tie rod 13, wherein the joint bearing outer ring 122 is firmly connected to the left-handed tie rod 12 and the right-handed tie rod 13 after extrusion molding, and the joint bearing inner ring 121 can rotate around the joint bearing outer ring 122, so that the left-handed tie rod 12 and the right-handed tie rod 13 can rotate around the joint bearing inner ring 121;

[0026] like Figure 3 As shown, a shallow groove 1231 is formed on the surface of the left-handed pull rod 12 and the right-handed pull rod 13 along the axial direction for fixing with the pull rod end locking piece 16. More specifically, the second protrusion 161 extends into the shallow groove 1231.

[0027] The left-handed hexagonal nut 14 and the right-handed hexagonal nut 15 are respectively matched with the threads of the left-handed tie rod 12 and the right-handed tie rod 13, and have a lock wire hole 141 and a safety wire. The tie rod end lock plate 16 is matched with the shallow groove 1231. After the match is formed, the tie rod end lock plate 16 can only move axially along the shallow groove 1231, and the tie rod end lock plate 16 cannot rotate alone. One end face of the ring body 1 of the tie rod end lock plate 16 is toothed, and one end face of the ring body 2 of the connecting rod end lock plate 17 is also toothed. The toothed end faces of the connecting rod end lock plate 17 and the tie rod end lock plate 16 are meshed, and the connecting rod end lock plate 17 also has a lock wire hole 2 173;

[0028] The use steps of the present invention are as follows:

[0029] Step 1: According to the designed theoretical length, first assemble the tie rod assembly 1, first screw the left-handed hexagonal nut 14 into the left-handed tie rod 12, screw it to the bottom, insert the tie rod end locking piece 16 into the left-handed tie rod 12, then insert the connecting rod end locking piece 17 into the left-handed tie rod 12, the tie rod end locking piece 16 and the connecting rod end locking piece 17 are tooth-to-tooth, and then the left-handed tie rod 12 and the connecting rod 11 are connected by left-handed threads;

[0030] Step 2: Screw the right-handed hexagonal nut 15 into the right-handed tie rod 13, screw it to the bottom, insert the tie rod end locking piece 16 into the right-handed tie rod 13, and then insert the connecting rod end locking piece 17 into the right-handed tie rod 13; the tie rod end locking piece 16 and the connecting rod end locking piece 17 are tooth-to-tooth, and then the right-handed tie rod 13 and the connecting rod 11 are connected by right-handed threads; at this time, the tie rod assembly 1 is initially formed, and the tie rod end locking piece 16, the connecting rod end locking piece 17 and the hexagonal nut are in an unlocked state;

[0031] Step 3: Place the tie rod assembly 1 between the fixing seat 2 and the high-temperature air bleed pipe 5, and use the fixing bolt 3 to pass through the central axis of the inner ring 121 of the spherical bearing. At this time, the tie rod assembly 1 can swing around the bolt 3 appropriately, and the length of the tie rod assembly 1 can be adjusted by rotating the thread of the connecting rod 11. If the mounting surfaces of the fixing seat 2 and the high-temperature air bleed pipe 5 are not parallel, they can be adjusted through the spherical bearing;

[0032] Step 4: After the length and swing angle of the tie rod assembly 1 are adjusted to the desired torque, tighten the connecting rod 11. When tightening the connecting rod 11, the tie rod end locking piece 16 and the connecting rod end locking piece 17 are separated, and the connecting rod end locking piece 17 is screwed with the connecting rod 11. Since the connecting rod 11 is rotated left and right, screwing the connecting rod 11 can ensure that both ends are tightened at the same time.

[0033] Step 5: Fit the teeth of the tie rod end locking piece 16 with the connecting rod end locking piece 17, then screw the left-handed hexagonal nut 14 until it fits with the tie rod end locking piece 16 and tighten it to the required torque, and screw the right-handed hexagonal nut 15 until it fits with the tie rod end locking piece 16 and tighten it to the required torque;

[0034] Step 6: Use a safety wire to lock the lock wire hole 141 through the left-handed hexagonal nut 14 and the lock wire hole 173 of the connecting rod end lock plate 17, and use a safety wire to lock the right-handed hexagonal nut 15 and the tie rod end lock plate 16 ... Figure 4 ;

[0035] Step 7: After the length of the tie rod assembly 11 is determined, the tie rod assembly 11 is fixed to the fixing seat 2 and the high-temperature air bleed pipe 5 using the fixing bolts 3 and the fixing nuts 4.

[0036] The present invention aims at the problem that if a bracket is used for the pipeline fixing structure, a large space is required for fixing and the bracket is heavy. If a fixed-length tie rod is used, high processing accuracy is required, the manufacturing cost is high, the installation is relatively difficult, and there is no compensation effect. For threaded connection tie rods, there is a high risk of failure and the functions of pipeline thermal compensation and pipeline vibration reduction are not provided. The pipeline connection structure of the present invention occupies a small space and adopts a tie rod form of a bellows. The tie rod itself has high strength and has a certain deformation ability. After the tie rod is heated, it has a certain elongation and contraction ability and has a thermal compensation effect. It can compensate for the thermal stress of the pipeline connection and the vibration of the pipeline. At the same time, the tie rod has the ability to adjust the axial length and can swing around the inner ring of the spherical bearing, which can compensate for assembly and manufacturing errors and can compensate for pipeline vibration and release stress.

[0037] The present invention adopts a multi-channel locking structure, and the connection is more reliable.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A tie rod fixing structure for a high temperature air bleed pipe of an aircraft, comprising a high temperature air bleed pipe; characterized in that: A fixed structure is provided on both sides of the high-temperature air bleed pipeline, and the fixed structure includes a tie rod assembly and a fixed seat. The two ends of the tie rod assembly are respectively connected to the high-temperature air bleed pipeline and the fixed seat through joint bearings; the tie rod assembly includes a connecting rod in the middle and tie rods on both sides, and the two ends of the two tie rods away from the connecting rod are connected to the joint bearings, and both ends of the connecting rod are fixedly connected with connecting rod end locking plates, and the two tie rods are respectively threadedly connected to the two ends of the connecting rod, and the tie rods are slidingly connected with the tie rod end locking plates, and each tie rod is threadedly connected with a nut.

2. The tie rod fixing structure of the aircraft high temperature air bleed pipe according to claim 1, characterized in that: Both ends of the pull rod are provided with slots, and the locking piece at the connecting rod end comprises a protrusion extending into the slot and a ring body connected to the protrusion.

3. The tie rod fixing structure of the aircraft high temperature air bleed pipe according to claim 2, characterized in that: A shallow groove is provided on the surface of the pull rod along the axial direction thereof, and the locking piece at the end of the pull rod comprises two protrusions extending into the shallow groove and two ring bodies connected with the two protrusions.

4. The tie rod fixing structure of the aircraft high temperature air bleed pipe according to claim 3, characterized in that: The first ring body and the second ring body are both provided with teeth near one side.

5. The tie rod fixing structure of the aircraft high temperature air bleed pipe according to claim 1, characterized in that: The threads on both sides of the tie rod are opposite.

6. The tie rod fixing structure of the aircraft high temperature air bleed pipe according to claim 1, characterized in that: The middle of the connecting rod is made of a deformable material.

7. The tie rod fixing structure of the aircraft high temperature air bleed pipe according to claim 4, characterized in that: The nut is provided with a first locking wire hole, the locking piece at the end of the connecting rod is provided with a second locking wire hole, and the first locking wire hole and the second locking wire hole are provided with fuses.

8. The tie rod fixing structure of the aircraft high temperature air bleed pipe according to claim 1, characterized in that: The spherical bearing is connected to the fixing seat and the high-temperature air bleed pipeline through fixing bolts and fixing nuts.

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