Aero-engine pipeline connecting structure with dynamic positioning pin

Abstract

The invention provides an aero-engine pipeline connecting structure with dynamic positioning pins. The aero-engine pipeline connecting structure comprises a first pipeline and a second pipeline. The first pipeline is connected with the second pipeline through a positioning pin; a mounting seat is arranged on the first pipeline, a plurality of positioning bosses for circumferential positioning are arranged at different positions in the circumferential direction of the mounting seat, and positioning holes are formed in the positioning bosses; a cylindrical boss is arranged in the positioning hole, and a plurality of stroke holes are formed in the side wall of the positioning hole; a mounting seat is arranged on the second pipeline, a plurality of matching positioning holes are formed in different positions in the circumferential direction of the mounting seat, and positioning pin matching holes are formed in the matching positioning holes. The connecting structure with the positioning boss and the positioning pin-spring is adopted, traditional rigid flange connection is omitted, and therefore local stress concentration caused by uneven assembling torque, pipe type deviation or forced assembling is avoided, the pipeline connecting reliability is effectively improved, and the fatigue life is effectively prolonged. Through dynamic cooperation between the positioning pins and the positioning holes, self-detection, flexible connection and rapid disassembly and assembly functions in the assembly process are achieved, and the connector is suitable for an external pipeline system of an aero-engine with the limited space.

Description

TECHNICAL FIELD

[0001] The application relates to an aero-engine pipeline connecting structure with dynamic positioning pins and belongs to the technical field of aero-engine external pipelines. BACKGROUND

[0002] Pipeline connecting structures are widely applied in industrial equipment, aerospace, petrochemical engineering and other fields, and the reliability thereof directly affects the safe operation of a system. However, the pipeline cracking problem caused by assembly stress has long plagued the engineering field.

[0003] During the assembly process of the pipeline connecting structure, local stress concentration is easily caused by axial deviation, radial misalignment or uneven tightening torque. Research shows that when the axial deviation reaches 0.8 mm, the fatigue life of the pipeline decreases by more than 40%. The problems of engine case mounting seat cracking and bleed air pipeline cracking caused by pipeline assembly deviation and assembly residual stress often occur in aero-engines, and the pipeline connecting structure commonly applied in the field of aero-engines is a rigid flange fixed connection, which has the problems of being unable to control the assembly deviation and having large assembly stress. SUMMARY

[0004] To solve the above technical problems, the application provides an aero-engine pipeline connecting structure with dynamic positioning pins, which can avoid the influence of uneven assembly torque, pipeline manufacturing deviation and assembly residual stress on the service life of the pipeline.

[0005] The application is implemented through the following technical solutions.

[0006] The aero-engine pipeline connecting structure with dynamic positioning pins provided by the application comprises a first pipeline and a second pipeline, the first pipeline is connected with the second pipeline through a positioning pin, a mounting seat is arranged on the first pipeline, a plurality of positioning bosses for circumferential positioning are arranged at different positions in the circumferential direction of the mounting seat, a positioning hole is arranged on each positioning boss, a cylindrical boss is arranged in the positioning hole, a plurality of stroke holes are arranged on the side wall of the positioning hole, a mounting seat is arranged on the second pipeline, a plurality of matched positioning holes are arranged at different positions in the circumferential direction of the mounting seat, and a positioning pin matched hole is arranged on each matched positioning hole. During assembly, first, a spring is sleeved on the cylindrical boss, the positioning pin is pressed into the stroke hole, then a sealing rubber ring is assembled at the bottom of the mounting seat of the second pipeline, the matched positioning hole of the second pipeline is aligned with the positioning boss of the first pipeline for assembly, after assembly is completed, the positioning pin is connected with the positioning pin matched hole of the second pipeline, and the connection between the first pipeline and the second pipeline is realized.

[0007] All the positioning holes are located at the same height.

[0008] The stroke holes comprise positioning pin installation stroke holes, mounting seat assembly stroke holes and positioning stroke holes.

[0009] The bottom of the positioning hole is reserved with a bottom hole for smooth rotation of the positioning pin.

[0010] The matching positioning holes are located at the same height.

[0011] The bottom of the positioning pin matching hole is provided with a through hole.

[0012] The circumferential direction of the positioning pin is provided with a plurality of small bosses, the top of the positioning pin is provided with a square hole, and the inner wall of the positioning pin is provided with a small hole.

[0013] The positioning boss is at least three, the stroke hole is at least three, and the matching positioning hole is at least three The positioning pin realizes stroke switching and dynamic connection through a spring.

[0014] The assembly process of the positioning pin is as follows: The positioning pin is first pressed into the positioning pin installation stroke hole, the cylindrical boss is placed into the spring, the positioning pin enters the installation seat assembly stroke hole, the sealing rubber ring is placed into the second pipeline, the positioning pin enters the positioning stroke hole, and when the positioning pin is completely matched with the top of the positioning stroke hole, the positioning pin finally enters the positioning pin matching hole, and the connection between the first pipeline and the second pipeline is realized.

[0015] The beneficial effects of the present application are that: by adopting the connection structure of the positioning boss and the positioning pin-spring, the traditional rigid flange connection is cancelled, so as to avoid the uneven assembly torque, the pipe type deviation or the local stress concentration caused by forced assembly, effectively improve the pipeline connection reliability and fatigue life. By utilizing the dynamic cooperation between the positioning pin and the positioning hole, the self-detection, flexible connection and quick disassembly and assembly functions of the assembly process are realized, and it is suitable for the space-limited external pipeline system of an aero-engine. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic diagram of the present application; Figure 2 is Figure 1 a structural schematic diagram of the first pipeline in the present application; Figure 3 is Figure 1 a structural schematic diagram of the second pipeline in the present application; Figure 4 is Figure 1 a structural schematic diagram of the positioning pin in the present application; Figure 5 is a structural schematic diagram of the installation and disassembly tool; Figure 6 is a schematic diagram of the positioning pin located in the positioning pin installation stroke hole; In the figure: 1-first pipeline, 2-second pipeline, 3-positioning pin, 4-spring, 5-sealing rubber ring. Detailed Implementation

[0017] The technical solution of the present invention is further described below, but the scope of protection is not limited to what is described.

[0018] Example 1 like Figure 1 As shown, the present invention includes a first pipe 1 with a mounting base and three circumferential positioning bosses, a second pipe 2 with a mounting base and three circumferentially mating positioning holes, a positioning pin 3 for axial positioning of the pipe, a spring 4 for fixing the positioning pin, and a rubber sealing ring 5.

[0019] like Figure 2 As shown, positioning bosses for circumferential positioning are machined at different positions on the circumference 3 of the mounting base. At the same relative height position of each positioning boss, a positioning hole is machined. A cylindrical boss for fixing the spring 4 is provided in the positioning hole. Multiple stroke holes are machined on the hole wall of the positioning hole, which are respectively the positioning pin installation stroke hole, the mounting base assembly stroke hole, and the positioning stroke hole. A bottom hole is reserved at the bottom of the positioning hole to allow the positioning pin 3 to rotate smoothly for the positioning pin 4 to switch strokes.

[0020] Specifically, the positioning pin 3 is kept in a fixed state by the elastic force of the spring 4. The positioning pin 4 is machined with a rotating interface (square hole) that cooperates with the installation and disassembly tools. The positioning pin 4 can be pressed into the bottom hole by the installation and disassembly tools, and the working stroke can be switched to fix or disassemble the pipeline.

[0021] like Figure 3 As shown, three mating positioning holes are provided at corresponding positions around the mounting base to mate with the positioning boss. At the same relative height position of each mating positioning hole, a positioning pin mating hole is machined. The mating condition of the positioning pin 3 and the positioning pin mating hole can be set according to the connection rigidity requirements. In the clearance state, part of the working stress can be compensated by the clearance, and the pipeline connection is a flexible connection. In the interference state, it is a rigid connection state. A through hole is machined at the bottom of the positioning pin mating hole. This through hole is a maintenance interface for disassembling and installing pipelines using installation and disassembly tools.

[0022] like Figure 4 As shown, two small bosses are provided at the bottom of the locating pin 3 to mate with the mounting stroke holes of the locating pin. A square hole is machined at the top of the locating pin for use with a simple disassembly tool for pipe disassembly, assembly, and maintenance. The structure of the disassembly tool is as follows. Figure 5 As shown.

[0023] Furthermore, to prevent interference between the locating pin 3 and the cylindrical boss of the fixing spring 4, a small hole is machined inside the locating pin 3.

[0024] Example 2 During assembly, first install the springs 4 into the cylindrical bosses of the first pipe 1, then align the two small bosses of the locating pin 3 with the locating pin mounting stroke holes of the first pipe 1, and use... Figure 5 The installation / removal tool shown compresses spring 4. When the locating pin 3 is pressed to the bottom, the tool is rotated counterclockwise by 45° to release the locating pin 3. The small protrusions of the locating pin 3 enter the mounting base assembly stroke hole under the action of the spring force. When the upper surface of the two small protrusions of the locating pin 3 contacts the top of the mounting base assembly stroke hole, the zero states are as shown. Figure 6 .

[0025] Assemble the sealing rubber ring 5 into the second pipe 2. Align the three circumferentially positioned locating holes of the second pipe 2 with the locating bosses of the first pipe 1 before assembly. When the first pipe 1 and the second pipe 2 are in full contact, use an installation / removal tool to insert the locating pin 3 into the square hole through the disassembly / maintenance through hole on the outer wall of the second pipe 2. Use the installation / removal tool to press the locating pin 3 into the bottom hole and rotate it counterclockwise 45° to loosen it. The locating pin 3 then enters the locating stroke hole of the first pipe 1. When the upper surfaces of the two small bosses of the locating pin 3 are fully engaged with the top of the locating stroke hole, the locating pin 3 enters the locating pin mating hole of the second pipe 2, achieving the connection function. At this time, the state of each part is as follows: Figure 1 As shown, when maintenance and disassembly are required, simply reverse the above procedure.

[0026] In summary, the beneficial effects of the present invention are as follows: 1. Traditional flange rigid connection method can forcibly connect pipelines by tightening a large torque. This can easily generate large stress during assembly and reduce service life. However, the present invention uses a locating pin and spring force to achieve connection. The spring force is along the pipeline path. The working surface of the locating pin is a cylindrical surface, which is perpendicular to the direction of the force. Therefore, the spring force will not affect the pipeline assembly position and can avoid the pipe shape deviation caused by the deviation of bolt and flange tightening torque. 2. It can realize the self-inspection of the pipe type during the assembly process. That is, the circumferential positioning between two pipes is achieved by the circumferential positioning boss, and the axial positioning is achieved by the positioning pin. When the pipe type manufacturing has a deviation, the mating surface of the mounting seat with the positioning boss and the mounting seat with the mating positioning hole will interfere, causing the pipe to be unable to be assembled and the positioning pin to be unable to be positioned with the mating positioning hole. Therefore, this invention can verify the pipe type. 3. This invention is simple to assemble and disassemble, facilitating maintenance. Aero engines have numerous external pipes, resulting in limited operating space during maintenance. Traditional flange connections require significant space to open locking mechanisms and remove fixing nuts, and opening locking washers often necessitates the use of hard tools such as chisels and hammers, which can easily damage the casing and other components. In contrast, this invention uses a simple disassembly device; disassembly is completed simply by inserting it into the square hole at the top of the locating pin through the external maintenance interface and rotating it. 4. The present invention can control the rigidity of the pipeline connection by the gap between the positioning pin and the positioning pin mating hole. When the gap is in the state, the working gap between the positioning pin and the positioning pin mating hole can compensate for part of the pipeline connection stress, which is beneficial to improving fatigue performance.

Claims

1. An aircraft engine pipeline connection structure with a dynamic positioning pin, comprising a first pipeline (1) and a second pipeline (2), characterized in that: The first pipeline (1) is connected to the second pipeline (2) via a positioning pin (3); the first pipeline (1) is provided with a mounting base, and multiple positioning bosses for circumferential positioning are provided at different positions around the mounting base, and positioning holes are provided on each positioning boss; a cylindrical boss is provided inside the positioning hole, and multiple stroke holes are provided on the side wall of the positioning hole; the second pipeline (2) is provided with a mounting base, and multiple mating positioning holes are provided at different positions around the mounting base, and positioning pin mating holes are provided on each mating positioning hole; During assembly, firstly, a spring (4) is fitted onto the cylindrical boss, and a positioning pin (3) is pressed into the stroke hole. Then, a sealing rubber ring (5) is fitted at the bottom of the mounting seat of the second pipeline (2). The mating positioning hole of the second pipeline (2) is aligned with the positioning boss of the first pipeline (1) for assembly. After assembly, the positioning pin (3) is connected to the positioning pin mating hole of the second pipeline (2) to realize the connection between the first pipeline (1) and the second pipeline (2).

2. The aircraft engine pipeline connection structure with dynamic positioning pin as described in claim 1, characterized in that: All positioning holes are located at the same height.

3. The aircraft engine pipeline connection structure with dynamic positioning pin as described in claim 1, characterized in that: The stroke holes include a positioning pin mounting stroke hole, a mounting base assembly stroke hole, and a positioning stroke hole.

4. The aircraft engine pipeline connection structure with dynamic positioning pin as described in claim 1, characterized in that: The bottom of the positioning hole is reserved with a bottom hole for the positioning pin (3) to rotate smoothly.

5. The aircraft engine pipeline connection structure with dynamic positioning pin as described in claim 1, characterized in that: All the mating positioning holes are located at the same height.

6. The aircraft engine pipeline connection structure with dynamic positioning pin as described in claim 1, characterized in that: The bottom of the positioning pin mating hole is provided with a through hole.

7. The aircraft engine pipeline connection structure with dynamic positioning pin as described in claim 1, characterized in that: The positioning pin (3) has multiple small protrusions in its circumference, a square hole at the top, and a small hole on its inner wall.

8. The aircraft engine pipeline connection structure with dynamic positioning pin as described in claim 1, characterized in that: The positioning boss has at least three, the travel hole has at least three, and the mating positioning hole has at least three.

9. The aircraft engine pipeline connection structure with dynamic positioning pin as described in claim 1, characterized in that: The positioning pin (3) achieves stroke switching and dynamic connection through the spring (4).

10. The aircraft engine pipeline connection structure with dynamic positioning pin as described in claim 3, characterized in that: The assembly process of the positioning pin (3) is as follows: First, the positioning pin (3) is pressed into the positioning pin installation stroke hole. After the cylindrical boss is placed into the spring (4), the positioning pin (3) enters the mounting base assembly stroke hole. After the sealing rubber ring (5) is placed into the second pipeline (2), the positioning pin (3) enters the positioning stroke hole. When the positioning pin (3) is fully engaged with the top of the positioning stroke hole, the positioning pin (3) finally enters the positioning pin mating hole, realizing the connection between the first pipeline (1) and the second pipeline (2).

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