Mounting device and mounting and disassembling method for pipeline in submerged cavity of aero-engine

Abstract

The invention discloses an installation device and an installation and disassembly method for a pipeline in an immersion cavity of an aero-engine, the installation device comprises a pull rod, a top sleeve, an expansion sleeve and a butterfly nut, the top sleeve is installed on an external thread of the expansion sleeve through an internal thread, and the pull rod penetrates through the top sleeve and the expansion sleeve and then is connected with the butterfly nut; the part, inserted into the top sleeve, of the expansion sleeve is of an opening forked structure. When the guide pipe is installed or disassembled, one end of the pull rod in a non-tensioning state and the opening bifurcated structure of the tensioning sleeve extend into the inner cavity of the guide pipe, and then the pull rod is pulled to enable the conical structure of the pull rod to enter the inner hole of the opening bifurcated structure to open the opening bifurcated structure so as to be attached to the inner cavity of the guide pipe and be tensioned. Further, the guide pipe is mounted in or taken out of the hole position of the immersion cavity through the mounting device, and when the mounting device needs to retreat and stop the guide pipe or push the guide pipe into a specific position, a fixed top sleeve or a movable top sleeve is adopted. The installation accuracy of the pipeline in the immersion cavity is optimized, the installation quality and efficiency are improved, and the leakage fault caused by the installation problem is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of aviation engine pipeline assembly, and in particular relates to a pipeline installation device for an aviation engine submerged cavity and an installation and disassembly method. Background Art

[0002] In order to meet the functional design, manufacturing and use requirements of aircraft engines, in the submerged cavity, the design of opening holes after casting parts is usually adopted to meet the corresponding use requirements. In particular, for the oil and air supply of certain key parts, the submerged design is usually adopted. With the needs of the oil and air supply mechanism, the pipeline can be normally limited to a special part in the narrow cavity. Usually, the submerged piping system is mostly carried out in the form of straight-through or open piping and then submerged again after open installation.

[0003] How to properly install and limit the pipeline to a special position in a narrow cavity has become a direction that needs to be considered in production and manufacturing. In order to improve the installation quality and efficiency of the pipeline in the aircraft engine immersion cavity, it is necessary to design a device with guidance, clamping, and limit pushing. That is, to design a pipeline installation device for the aircraft engine immersion cavity, to achieve the guidance, clamping, and limit pushing of the catheter in the cavity, so that the catheter can be smoothly installed in a specific position in the cavity, and the device can be limited and stopped after being disengaged. Summary of the invention

[0004] The present invention aims to provide a device for installing pipelines in the submerged cavity of an aircraft engine and an installation and disassembly method, so as to optimize the accuracy of pipeline installation in the submerged cavity, avoid the deviation of the pipeline installation caused by the misalignment of the buried end, and thus prevent leakage failure of the air bleed mechanism during oil and air supply.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A pipeline installation device for an aircraft engine submerged cavity, comprising:

[0007] A top sleeve, wherein the top sleeve is a rotary shell with a first axial through hole;

[0008] An expansion sleeve, wherein the expansion sleeve is a cylindrical shell with a second axial through hole, and a plurality of slots connected to the second axial through hole are formed on one end face of the expansion sleeve, and the slots extend from the end face toward the other end face of the expansion sleeve, and the extension directions of the plurality of slots are parallel to the cylindrical generatrix, and the portion of the expansion sleeve with the slots is inserted into the first axial through hole of the top sleeve;

[0009] A pull rod, wherein the outer diameter of the cross-section of the first end of the pull rod in the axial direction is larger than the outer diameter of the cross-section of the rest of the pull rod and the inner diameter of the second axial through hole corresponding to the portion with the groove on the expansion sleeve, and after the pull rod passes through the first axial through hole of the top sleeve and the second axial through hole of the expansion sleeve, its end extends to a certain distance outside the expansion sleeve.

[0010] Furthermore, the surface of the pull rod located outside the expansion sleeve is provided with an external thread, and is connected to the butterfly nut via the external thread.

[0011] Furthermore, the top sleeve is a cylindrical shell having two sections with different outer diameters, and the first axial through hole is a stepped hole having two sections with different inner diameters, wherein the surface of one of the stepped holes is processed with an internal thread;

[0012] Furthermore, the expansion sleeve is a cylindrical shell comprising three sections with different outer diameters, the section with the smallest outer diameter among the three sections corresponds to the section with the slot on the expansion sleeve, the section with the middle outer diameter among the three sections has an external thread on its surface and is installed in a stepped hole with an internal thread on the top sleeve, and the section with the largest outer diameter among the three sections is located on the outside of the top sleeve.

[0013] Furthermore, the first end of the pull rod in the axial direction is a tapered surface with a gradually decreasing outer diameter.

[0014] A method for installing a pipeline in an aircraft engine submerged cavity uses the aforementioned installation device with a butterfly nut and includes the following steps:

[0015] Step 1: Keep the expansion sleeve still and move the top sleeve closer to the expansion sleeve until the end surface with the notch on the expansion sleeve is exposed from the top sleeve, and then insert the exposed end with the notch on the expansion sleeve and the first end in the axial direction of the pull rod into the inner cavity of the catheter;

[0016] Step 2: Keep the catheter, top sleeve and expansion sleeve stationary, rotate the butterfly nut on the pull rod until the butterfly nut is close to the expansion sleeve and the second end of the pull rod in the axial direction moves away from the expansion sleeve until the first end of the pull rod in the axial direction enters the second axial through hole of the expansion sleeve and squeezes the end of the expansion sleeve with the notch to expand the outer diameter so as to press against the inner wall of the catheter;

[0017] Step 3, moving the catheter, the top sleeve and the expansion sleeve as a whole until the front end of the catheter is sent into the hole in the immersion cavity;

[0018] Step 4: Rotate the butterfly nut in the opposite direction until the butterfly nut is away from the expansion sleeve, keep the expansion sleeve stationary, move the top sleeve away from the expansion sleeve until the top sleeve pushes the catheter into the hole in the immersion cavity, and remove the installation device.

[0019] As an option:

[0020] In the installation device, at least a length of the top sleeve has an outer diameter less than or equal to the outer diameter of the conduit, and the starting position of the length is located at the end surface where the top sleeve contacts the conduit;

[0021] In step 4, the catheter is pushed into the hole in the immersion cavity to a specified depth through the portion of the top sleeve whose outer diameter is less than or equal to the outer diameter of the catheter.

[0022] A method for disassembling a pipeline in an aircraft engine submerged cavity adopts the aforementioned mounting device with butterfly nuts and comprises the following steps:

[0023] Step 1: confirm that the first end of the pull rod in the axial direction does not squeeze the end of the expansion sleeve with the notch;

[0024] Step 2: insert the first end of the pull rod in the axial direction and the end of the expansion sleeve with the notch into the inner cavity of the catheter in the hole in the immersion cavity;

[0025] Step 3: Keep the top sleeve and the expansion sleeve stationary, and rotate the butterfly nut until the butterfly nut is close to the expansion sleeve and the second end of the pull rod in the axis direction moves away from the expansion sleeve until the rotation resistance of the butterfly nut suddenly increases;

[0026] Step 4: Move the pull rod, the top sleeve and the expansion sleeve as a whole in a direction away from the hole in the immersion cavity until the catheter is pulled out of the hole in the immersion cavity as a whole, thereby completing the catheter disassembly.

[0027] At present, for the disassembly and removal of the catheter in the pipeline in the immersed cavity, pliers are usually used to wrap cloth to reduce damage and contact and then forcefully remove it. However, this method may be feasible in an emergency, but it is a loss-making choice for the overall system of the engine. From the effect point of view, the simple clamp can remove the catheter but slightly damages the sealing of the installation hole at the end of the catheter. If the frequency of disassembly and assembly of the relevant mechanism is too large, it will cause great wear, thereby causing the hidden danger of oil and air leakage.

[0028] In engineering applications, the narrow space in the cavity itself is to reduce the risk of oil and gas leakage in a large force or operating force mechanism. The device for installing pipelines in an immersed cavity designed by the present invention not only reduces the rework and clamping problems during the installation of the catheter, but also avoids the hidden danger of the catheter falling off and being adjusted into the cavity, thereby improving the success rate of the catheter installation in one time and ensuring the reliability of the assembly process.

[0029] The installation device and the conduit installation and disassembly method designed by the present invention solve the problem of the specificity of the installation tool from the side, rather than being a temporary emergency tool, and play an important role in engineering applications.

[0030] Compared with the prior art, the present invention designs a device for installing pipelines in the submerged cavity of an aircraft engine. The device is mainly divided into several parts according to different functional designs, including support clamping, guiding, effective extension of length adjustment, positioning, removal, and limited pushing, etc. Among them, the support clamping is used to fix the catheter as an integrated support to prevent the catheter from shaking during installation; by fixing to form a whole, the function of holding the outer end guide end can be achieved to ensure that the guiding function can be smoothly achieved; by increasing the stroke through the top sleeve, the length can be effectively extended to adjust the positioning; when offset, it can be effectively and timely removed or adjusted, and by limited pushing, the catheter can be prevented from moving outward at the installation hole to cause dislocation.

[0031] When disassembling and removing the catheter, due to the small space in the cavity and the tight fit between the pipeline sealing ring and the support hole, the embarrassment of "having strength but nowhere to use it" will occur when removing the catheter. Similarly, under conditions where certain electromagnetic equipment cannot be visualized or used, the application of the installation device of the present invention can effectively avoid the occurrence of installation failures. The design and implementation of the installation device of the present invention can greatly meet the installation and disassembly operation requirements of the pipeline catheter in the immersion cavity, and can prevent the catheter from falling into the narrow cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a cross-sectional view of the pipeline installation device used in the submerged cavity of an aircraft engine in the present invention;

[0033] Figure 2 A schematic diagram of a top sleeve, an expansion sleeve, a pull rod and a butterfly nut in a pipeline installation device for an aircraft engine submerged cavity;

[0034] Figure 3 A three-dimensional diagram of the piping installation device in the submerged cavity of an aircraft engine;

[0035] In the figure: 1-pull rod, 2-top sleeve, 3-expansion sleeve, 4-butterfly nut. DETAILED DESCRIPTION

[0036] The present invention is further described below in conjunction with specific embodiments, but it should not be understood that the scope of the subject matter described in the present invention is limited to the following embodiments. Without departing from the above-mentioned technical ideas of the present invention, various modifications, substitutions and changes made according to common technical knowledge and customary means in the field are included in the scope of the present invention.

[0037] like Figure 1 to Figure 3 As shown, the piping installation device designed by the present invention for the submerged cavity of an aircraft engine includes a pull rod 1, a top sleeve 2, an expansion sleeve 3 and a butterfly nut 4. The top sleeve 2 is installed on the external thread of the expansion sleeve 3 through an internal thread. The pull rod 1 passes through the top sleeve 2 and the expansion sleeve 3 and is connected to the butterfly nut 4. The part of the expansion sleeve 3 inserted into the top sleeve 2 is an open forked structure.

[0038] like Figure 2 The left end of the pull rod 1 is a conical structure, and its right end surface has external threads; the top sleeve 2 is a cylindrical body with two different outer diameters, and the top sleeve 2 has a stepped through hole in the axial direction, and the inner wall of the stepped through hole at one end close to the outer diameter angle is processed with internal threads; the expansion sleeve 3 is a cylindrical body with four sections of different outer diameters, and the leftmost part is an open forked structure, followed by a cylindrical section with external threads, and finally a cylindrical section with increasing outer diameters at both ends. The expansion sleeve 3 also has a through hole in the axial direction, and the pull rod 1 passes through the stepped through hole of the top sleeve 2 and the through hole of the expansion sleeve 3 and is connected to the butterfly nut 4.

[0039] When it is necessary to install a conduit in a pipeline in an aircraft engine submerged cavity, first follow Figure 1 Installation of assembly relationships in Figure 2 The components in .

[0040] Before installing the conduit, Figure 1 and Figure 3 First, loosen the butterfly nut 4 to the right and away from the end face of the expansion sleeve 3, which is in a free state. The pull rod 1 is in a relaxed state, and the conical structure of the pull rod 1 is exposed to the open bifurcated end of the expansion sleeve 3, and is in a non-expanded state with the open bifurcated end of the expansion sleeve 3. When the butterfly nut 4 is screwed to the left, the pull rod 1 can be effectively tightened to the right through the thread transmission, causing the conical structure to move rightward into the open bifurcated structure of the expansion sleeve 3, and then expand the open bifurcated structure of the expansion sleeve 3, so that the expansion sleeve 3, the pull rod 1, and the butterfly nut 4 form a whole and cannot be disengaged.

[0041] When installing the conduit, Figure 1 and Figure 3 , loosen the butterfly nut 4, push the pull rod 1 to the left, so that the butterfly nut 4 and the pull rod 1 are both in a free state. Hold the top sleeve 2, retreat outward, rotate the expansion sleeve 3 so that the open bifurcation structure at the left end of the expansion sleeve 3 exposes the top sleeve 2, and then insert the pull rod 1 and the open bifurcation end of the expansion sleeve 3 into the inner cavity of the catheter. At this time, reversely rotate the butterfly nut 4 until it is close to the end face of the expansion sleeve 3, and continue to rotate the butterfly nut 4. When you feel the resistance of rotating the butterfly nut 4 suddenly increase, it indicates that the open bifurcation at the left end of the expansion sleeve 3 has been stretched and tightened the inner cavity of the catheter. At this time, the catheter has been limited. Insert the catheter into the hole of the immersion chamber through the installation device, and then reversely rotate (loosen) the butterfly nut 4, keep the top sleeve 2 stationary, push the pull rod 1 to the left so that the conical structure of the pull rod 1 is separated from the open bifurcation structure of the expansion sleeve 3, and then keep the expansion sleeve 3 stationary, rotate the top sleeve 2 so that the top sleeve 2 moves to one side of the catheter and pushes the catheter into the hole to a certain depth. At this time, pull out the installation device and successfully disengage the catheter. The protrusion or immersion of the catheter is measured with the cavity mouth as the end face to confirm that the catheter meets the design installation height requirements. The catheter is slightly moved (when the catheter is protruding from the cavity mouth end face). If there is no shaking, it can be considered as a qualified installation. The above installation operation method is feasible after multiple borescope inspections, easy to operate, and meets the use requirements.

[0042] When the catheter needs to be removed, Figure 1 and Figure 3 , loosen the butterfly nut 4, push the pull rod 1 to the left, so that the butterfly nut 4 and the pull rod 1 are both in a free state, insert the conical structure of the pull rod 1 and the open fork structure of the expansion sleeve 3 into the inner cavity of the catheter in the hole, and then tighten the butterfly nut 4 in the reverse direction, so that the open fork structure of the expansion sleeve 3 tightens the inner cavity of the catheter, and then withdraws to the outside of the hole in a direction perpendicular to the end face of the cavity mouth, and the catheter can be easily taken out.

[0043] The installation device of the present invention has been improved and finalized after multiple times of use verification. It is easy to operate and simple to install. It plays a great role in the installation and disassembly of the engine fuel supply pipe, and effectively avoids the clamping damage of such conduits caused by the emergency simple operation method.

[0044] The contents not described in detail in the specification of the present invention belong to the prior art known to the professional and technical personnel in the field. Although the illustrative specific embodiments of the present invention are described above to facilitate the understanding of the present invention by the technical personnel in the field, it should be clear that the present invention is not limited to the scope of the specific embodiments. For the ordinary technical personnel in the field, as long as various changes are within the spirit and scope of the present invention defined and determined by the attached claims, these changes are obvious, and all inventions and creations using the concept of the present invention are protected.

Claims

1. A pipeline installation device for an aircraft engine submerged cavity, characterized in that: include: A top sleeve (2), wherein the top sleeve (2) is a rotary shell having a first axial through hole; An expansion sleeve (3), the expansion sleeve (3) being a cylindrical shell with a second axial through hole, a plurality of slots communicating with the second axial through hole being formed on one end face of the expansion sleeve (3), and the slots extending from the end face toward the other end face of the expansion sleeve (3), the extension directions of the plurality of slots being parallel to the cylindrical generatrix, and the portion of the expansion sleeve (3) with the slots being inserted into the first axial through hole of the top sleeve (2); A pull rod (1), wherein the outer diameter of the cross section of the first end of the pull rod (1) in the axial direction is larger than the outer diameter of the cross section of the rest of the pull rod (1) and the inner diameter of the second axial through hole corresponding to the portion with the notch on the expansion sleeve (3), and after the pull rod (1) passes through the first axial through hole of the top sleeve (2) and the second axial through hole of the expansion sleeve (3), its end extends to a distance outside the expansion sleeve (3).

2. The device for installing pipelines in the submerged cavity of an aircraft engine according to claim 1, characterized in that: The surface of the pull rod (1) located outside the expansion sleeve (3) is provided with an external thread, and is connected to the butterfly nut (4) via the external thread.

3. The device for installing pipelines in the submerged cavity of an aircraft engine according to claim 1, characterized in that: The top sleeve (2) is a cylindrical shell having two sections with different outer diameters, and the first axial through hole is a stepped hole having two sections with different inner diameters, wherein the surface of one of the stepped holes is processed with an internal thread; The expansion sleeve (3) is a cylindrical shell having three sections with different outer diameters. The section with the smallest outer diameter among the three sections corresponds to the section with the notch on the expansion sleeve (3). The section with the middle outer diameter among the three sections has an external thread on its surface and is installed in a stepped hole with an internal thread on the top sleeve (2). The section with the largest outer diameter among the three sections is located on the outside of the top sleeve (2).

4. The device for installing pipelines in the submerged cavity of an aircraft engine according to claim 1, characterized in that: The first end of the pull rod (1) in the axial direction is a tapered surface with a gradually decreasing outer diameter.

5. A method for installing pipelines in an aircraft engine submerged cavity, characterized in that: The installation device according to claim 2 is used, and includes the following steps: Step 1: Keep the expansion sleeve (3) stationary, move the top sleeve (2) toward the expansion sleeve (3) until the end surface with the notch on the expansion sleeve (3) is exposed from the top sleeve (2), and then insert the exposed end with the notch on the expansion sleeve (3) and the first end of the pull rod (1) in the axial direction into the inner cavity of the catheter; Step 2: Keep the catheter, the top sleeve (2) and the expansion sleeve (3) stationary, rotate the butterfly nut (4) on the pull rod (1) until the butterfly nut (4) is tightly against the expansion sleeve (3) and the second end of the pull rod (1) in the axial direction moves away from the expansion sleeve (3) until the first end of the pull rod (1) in the axial direction enters the second axial through hole of the expansion sleeve (3) and squeezes the end of the expansion sleeve (3) with the notch to expand the outer diameter, thereby pressing against the inner wall of the catheter; Step 3, moving the catheter, the top sleeve (2) and the expansion sleeve (3) as a whole until the front end of the catheter is inserted into the hole in the immersion cavity; Step 4: Rotate the butterfly nut (4) in the opposite direction until the butterfly nut (4) is away from the expansion sleeve (3), keep the expansion sleeve (3) stationary, move the top sleeve (2) in the direction away from the expansion sleeve (3), until the top sleeve (2) pushes the catheter into the hole in the immersion cavity, and remove the installation device.

6. The method for installing pipelines in an aircraft engine submerged cavity according to claim 5, characterized in that: In the installation device, at least a section of the top sleeve (2) has an outer diameter that is less than or equal to the outer diameter of the catheter, and the starting position of the length is located at the end surface where the top sleeve (2) contacts the catheter; In the step 4, the catheter is pushed into the hole in the immersion cavity to a specified depth through the portion of the top sleeve (2) whose outer diameter is less than or equal to the outer diameter of the catheter.

7. A method for disassembling pipelines in an aircraft engine submerged cavity, characterized in that: The installation device according to claim 2 is used, and includes the following steps: Step 1, confirming that the first end of the pull rod (1) in the axial direction does not squeeze the end of the expansion sleeve (3) with the notch; Step 2, inserting the first end of the pull rod (1) in the axial direction and the end of the expansion sleeve (3) with the notch into the inner cavity of the catheter in the hole in the immersion cavity; Step 3: Keep the top sleeve (2) and the expansion sleeve (3) stationary, rotate the butterfly nut (4) until the butterfly nut (4) is tightly attached to the expansion sleeve (3) and the second end of the pull rod (1) in the axial direction moves away from the expansion sleeve (3) until the rotation resistance of the butterfly nut (4) suddenly increases; Step 4: Move the pull rod (1), the top sleeve (2) and the expansion sleeve (3) as a whole in a direction away from the hole in the immersion cavity until the catheter is pulled out of the hole in the immersion cavity as a whole, thereby completing the catheter disassembly.

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