Guiding device

Abstract

This invention discloses a guiding device, comprising a drive shaft, a mounting base, a drive block, a guide plate, and an elastic cable tie. The drive shaft includes a drive end and a fixed end; the mounting base is threadedly connected to the fixed end; the drive block is sleeved on the drive shaft, positioned between the drive end and the fixed end, and its radial dimension gradually increases or decreases along the drive shaft in a direction away from the fixed end; the guide plate is slidably connected to the mounting base, moves radially along the drive shaft, extends along the axial direction of the drive shaft, and abuts against the drive block; the elastic cable tie simultaneously sleeves the drive shaft and the guide plate. Through surface contact expansion between the drive block and the guide plate, the outward expansion progressive centering of the guiding device becomes more uniform and stable, improving the fixing effect. Under the elastic force of the elastic cable tie, the guide plate can contract, reducing the effective diameter of the guiding device and thus achieving separation of the guiding device.

Description

Technical Field

[0001] This invention relates to a guiding device. Background Technology

[0002] The low-pressure pivot assembly connects the fan rotor and low-pressure turbine rotor of the aero-engine. It is mounted on the intermediate casing, approximately 1000mm from the front mounting edge of the fan casing. The sealing ring at the end of the low-pressure pivot assembly forms a grate seal with the grates on the compressor front shaft, resulting in a small radial clearance of approximately 0.2mm. The low-pressure pivot assembly is installed using a horizontal lifting method. Because its connection point is inside the fan casing and not visible during installation, coupled with the small radial clearance at the grate seal, precise alignment during horizontal lifting by a crane is difficult. If misaligned, the grates on the compressor front shaft will scrape against the sealing ring at the rear end of the low-pressure pivot assembly, causing damage to the grates and leading to seal failure.

[0003] To achieve precise alignment and installation of the low-pressure pivot assembly, a guiding device is required. Conventional guiding devices are typically fixed to a component (or assembly), extending the axis of a shaft (or hole) on that component (or assembly) to mate with the hole (or shaft) feature of another component (or assembly), forming a guiding structure that guides the two components (or assemblies) to precise alignment and assembly. However, due to the complex shape of the inner bore of the low-pressure pivot assembly, and the fact that its minimum diameter is smaller than the inner bore diameter of the compressor front shaft, and furthermore, the compressor front shaft lacks easily accessible features such as threads to fix the guiding device, the design of a guiding device for precise alignment and installation of the low-pressure pivot assembly faces two challenges: fixing the guiding device and separating (or removing) it after installation. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the problem that the low-pressure fulcrum assembly in the prior art cannot achieve the fixation and separation of the guide device, and to provide a guide device.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] A guiding device for mounting a low-pressure pivot assembly and a high-pressure compressor front shaft bore, the guiding device comprising:

[0007] A drive shaft, the drive shaft including a drive end and a fixed end;

[0008] Mounting base, the mounting base being threadedly connected to the fixed end;

[0009] A drive block is sleeved on the drive shaft and disposed between the drive end and the fixed end. Along the direction away from the fixed end, the radial dimension of the drive block gradually increases or decreases along the drive shaft.

[0010] A guide plate is slidably connected to the mounting base, the guide plate moves radially along the drive shaft, the guide plate extends along the axial direction of the drive shaft, and the guide plate abuts against the drive block;

[0011] An elastic cable tie is used to cover both the drive shaft and the guide plate.

[0012] In this technical solution, the guiding device adopts a contraction-expansion structure, and the effective diameter of the guiding device can be varied. When the drive shaft rotates, the drive block moves back and forth along the axis of the drive shaft under threaded transmission. As the drive shaft drives the drive block to move closer to the mounting base, the outer circumferential surface of the drive block, which continuously increases radially along the drive shaft, presses against the guide plate. This causes the guide plate to continuously expand outward, thereby increasing the friction between the guide plate and the inner wall of the high-pressure compressor front shaft, achieving an outward expansion-type fixation of the guiding device. Through the surface contact expansion between the drive block and the guide plate, the outward expansion-type progressive centering of the guiding device is more uniform and stable, improving the fixing effect. Under the elastic force of the elastic strap, the guide plate can contract, reducing the effective diameter of the guiding device, thereby achieving separation of the guiding device.

[0013] Preferably, the guide plate comprises multiple guide plates, which are evenly distributed and spliced ​​together to form a ring structure, and the drive shaft is located within the ring structure.

[0014] In this technical solution, the annular structure can simultaneously compress the inner wall of the front shaft of the high-pressure compressor, increasing the force balance and improving stability.

[0015] Preferably, the portion of the guide plate away from the fixed end extends in a direction away from the axis of the drive shaft.

[0016] In this technical solution, the thickness of the part of the guide plate away from the fixed end is increased to facilitate the abutment of the guide plate.

[0017] Preferably, the end face of the guide plate away from the drive shaft is provided with a guide bevel.

[0018] In this technical solution, the guide bevel facilitates gradual centering.

[0019] Preferably, the drive block is provided with a limiting groove, the guide plate passes through the limiting groove, and the outer peripheral surface of the guide plate abuts against the limiting groove.

[0020] In this technical solution, the limiting grooves block the guide plate from both sides, transforming the characteristic of the guide plate being able to move only radially into the characteristic of the drive block being able to move only along the axis of the drive shaft. This prevents the drive block from rotating along with the drive shaft, which would cause the drive block to disengage from the guide plate, leading to the failure of the compression between the guide plate and the drive block, and consequently causing the failure of the expansion and contraction function of the guide device.

[0021] Preferably, the guiding device includes at least two mounting bases, at least one of the mounting bases being disposed between the drive block and the drive end.

[0022] In this technical solution, one mounting base is located at the fixed end, and at least one mounting base is located between the fixed end and the drive end, which can make the guide plate move smoothly in the radial direction of the drive shaft.

[0023] Preferably, the diameter of the drive shaft near the drive end is larger than the diameter near the fixed end, the drive shaft forms a stepped support, the support abuts against the end face of the mounting seat near the drive end, and a nut is provided at the end of the drive shaft away from the drive end.

[0024] In this technical solution, the stepped structure cooperates with the mounting base, and with the action of the nut, it is easy to install and remove the guide device as a whole by hand.

[0025] Preferably, the mounting base is provided with a positioning groove, the opening of the positioning groove extends in a direction away from the drive shaft, and the guide plate passes through the positioning groove.

[0026] In this technical solution, the guide plate is installed in the positioning groove of the mounting base, and the mounting base enables the guide plate to move only radially along the drive shaft.

[0027] Preferably, the mounting base includes a connecting pin, the guide plate is provided with a guide groove, and the connecting pin cooperates with the guide groove.

[0028] In this technical solution, the connecting pin facilitates the installation and disassembly of the guide plate and the mounting base, allowing the guide plate to move radially along the drive shaft only on the mounting base, thus forming a relatively stable connection between the guide plate and the mounting base, preventing them from separating.

[0029] Preferably, the guide plate has a positioning column surface at a portion away from the drive shaft, and the positioning column surface extends radially along the drive shaft.

[0030] In this technical solution, the positioning cylindrical surface facilitates the mutual contact between the guiding device and the front shaft hole of the high-pressure compressor.

[0031] The positive and progressive effects of this invention are as follows:

[0032] The guiding device employs a contraction-expansion structure, allowing for a variable effective diameter. As the drive shaft rotates, the drive block moves back and forth along the drive shaft axis under threaded transmission. When the drive shaft moves the drive block closer to the mounting base, the outer circumference of the drive block, which continuously increases radially along the drive shaft, presses against the guide plate. This causes the guide plate to continuously expand outward, increasing the friction between the guide plate and the inner wall of the high-pressure compressor's front shaft, achieving an outward expansion-type fixation of the guiding device. Through surface contact expansion between the drive block and the guide plate, the outward expansion-type progressive centering of the guiding device becomes more uniform and stable, improving the fixation effect. Under the elastic force of the elastic straps, the guide plate can contract, reducing the effective diameter of the guiding device and thus enabling its separation. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the installation environment of a guiding device according to an embodiment of the present invention.

[0034] Figure 2 This is a schematic diagram of the initial installation position of the guiding device according to an embodiment of the present invention.

[0035] Figure 3 This is a schematic diagram of the structure of a guiding device according to an embodiment of the present invention.

[0036] Figure 4 This is a cross-sectional structural schematic diagram of a guiding device according to an embodiment of the present invention.

[0037] Figure 5 This is a partially enlarged schematic diagram of a guiding device according to an embodiment of the present invention.

[0038] Explanation of reference numerals in the attached figures

[0039] Low-voltage pivot assembly 100

[0040] Compressor front shaft 200

[0041] Intermediate housing 300

[0042] Fan housing 400

[0043] 500-tooth sealing structure

[0044] Engine shaft 600

[0045] Guiding device 700

[0046] Drive shaft 1, drive end 11, fixed end 12, support platform 13

[0047] Mounting base 2, positioning groove 21, connecting pin 22

[0048] Drive block 3, limit slot 31

[0049] Guide plate 4, guide groove 41, positioning column surface 42

[0050] 5 elastic cable ties

[0051] Guide bevel 6

[0052] Nut 7 Detailed Implementation

[0053] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0054] like Figure 1 and Figure 3 As shown, this invention discloses a guide device 700 for mounting the low-pressure pivot assembly 100 and the compressor front shaft 200 of the high-pressure compressor in the shaft hole. The mounting environment of the guide device 700 includes an intermediate housing 300, a fan housing 400, and a grate sealing structure 500. The guide device 700 is mounted along the engine axis 600. The guide device 700 includes a drive shaft 1, a mounting base 2, a drive block 3, and a guide plate 4. The two ends of the drive shaft 1 are a drive end 11 and a fixed end 12, respectively, and the mounting base 2 is threaded onto the fixed end 12. The drive block 3 is sleeved on the drive shaft 1, positioned between the drive end 11 and the fixed end 12, and its radial dimension gradually increases in the direction away from the fixed end 12. The guide plate 4 is slidably connected to the mounting base 2, extending along the axial direction of the drive shaft 1, and abuts against the drive block 3. An elastic cable tie 5 is simultaneously sleeved on the drive shaft 1 and the guide plate 4.

[0055] In other embodiments, the size of the drive block 3 in the radial direction of the drive shaft 1 gradually decreases in the direction away from the fixed end 12.

[0056] The guide device 700 adopts a contraction-expansion structure, and its effective diameter can be varied. When the drive shaft 1 rotates, the drive block 3 moves back and forth along the axis of the drive shaft 1 under threaded transmission. As the drive shaft 1 drives the drive block 3 towards the mounting base 2, the outer circumferential surface of the drive block 3, which continuously increases radially along the drive shaft 1, presses against the guide plate 4. The drive block 3 causes the guide plate 4 to continuously expand outward, thereby increasing the friction between the guide plate 4 and the inner wall of the high-pressure compressor front shaft 200, achieving an outward expansion fixation of the guide device 700. Through the surface contact expansion between the drive block 3 and the guide plate 4, the outward expansion progressive centering of the guide device 700 becomes more uniform and stable, improving the fixing effect. Under the elastic force of the elastic strap 5, the guide plate 4 can contract, reducing the effective diameter of the guide device 700, thus achieving separation of the guide device 700. This enables precise alignment and installation of the low-pressure support assembly 100, reducing the risk of scraping between the grate teeth and the sealing ring in blind installation.

[0057] like Figure 2 and Figure 4 As shown, the guide plate 4 comprises multiple evenly arranged guide plates 4 wound around the drive shaft 1. These guide plates 4 are spliced ​​together to form a ring structure, with the drive shaft 1 located within the ring structure. The ring structure allows for simultaneous compression of the inner wall of the high-pressure compressor front shaft 200, increasing force balance and improving stability. Simultaneously, the ring structure can contract under the action of the elastic strap 5, reducing the effective diameter of the guide device 700 and thus enabling its separation. The guide plate 4 and the drive block 3 are engaged with an inclined surface. The drive block 3 can move back and forth along the axis of the drive shaft 1 under threaded transmission. The inclined surface pushes the multiple guide plates 4 to expand or contract synchronously, changing their diameter and achieving an expansion-type fixation of the guide device 700.

[0058] like Figure 1 and Figure 5 As shown, the portion of the guide plate 4 away from the fixed end 12 extends in a direction away from the axis of the drive shaft 1. Increasing the thickness of the portion of the guide plate 4 away from the fixed end 12 facilitates the abutment of the guide plate 4. The end face of the guide plate 4 away from the drive shaft 1 is provided with a guide bevel 6. The guide bevel 6 facilitates progressive centering. The portion of the guide plate 4 away from the drive shaft 1 is provided with a positioning column surface 42, which extends radially along the drive shaft 1. The positioning column surface 42 facilitates the abutment of the guide device 700 and the front shaft bore of the high-pressure compressor.

[0059] like Figure 3 and Figure 4 As shown, the drive block 3 is provided with a limiting groove 31, and the guide plate 4 passes through the limiting groove 31, with the outer peripheral surface of the guide plate 4 abutting against the limiting groove 31. The limiting groove 31 blocks the guide plate 4 from both sides, converting the characteristic that the guide cover can only move radially into that the drive block 3 can only move along the axis of the drive shaft 1. This prevents the drive block 3 from rotating along with the drive shaft 1, causing the drive block 3 to disengage from the guide plate 4, which would lead to the failure of the compression between the guide plate 4 and the drive block 3, and consequently, the failure of the expansion and contraction function of the guide device 700.

[0060] like Figure 3 and Figure 4 As shown, the guide device 700 includes at least two mounting seats 2, with at least one mounting seat 2 positioned between the drive block 3 and the drive end 11, ensuring smooth movement of the guide plate 4 along the driving direction of the drive shaft 1. The diameter of the drive shaft 1 near the drive end 11 is larger than the diameter near the fixed end 12. The drive shaft 1 forms a stepped support 13, which abuts against the end face of the mounting seat 2 near the drive end 11. A nut 7 is provided at the end of the drive shaft 1 away from the drive end 11. The stepped structure cooperates with the mounting seat 2, and the nut 7 facilitates the integral installation and removal of the guide device 700 by hand.

[0061] like Figure 3 and Figure 4 As shown, the mounting base 2 is provided with a positioning groove 21. The opening of the positioning groove 21 extends in a direction away from the drive shaft 1, and the guide plate 4 passes through the positioning groove 21. The guide plate 4 is installed in the positioning groove 21 of the mounting base 2, and the mounting base 2 enables the guide plate 4 to move only radially along the drive shaft 1.

[0062] like Figure 3 and Figure 5 As shown, the mounting base 2 includes a connecting pin 22, and the guide plate 4 has a guide groove 41. The connecting pin 22 and the guide groove 41 cooperate with each other. By providing the connecting pin 22, the installation and removal of the guide plate 4 and the mounting base 2 are facilitated, ensuring that the guide plate 4 can only move radially along the drive shaft 1 on the mounting base 2. This makes the guide plate 4 and the mounting base 2 form a relatively stable connection, preventing the guide plate 4 from spreading out on the mounting base 2.

[0063] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A guiding device for mounting a low-pressure pivot assembly and a high-pressure compressor front shaft bore, characterized in that, The guiding device includes: A drive shaft, the drive shaft including a drive end and a fixed end; Mounting base, the mounting base being threadedly connected to the fixed end; A drive block is sleeved on the drive shaft and disposed between the drive end and the fixed end. Along the direction away from the fixed end, the radial dimension of the drive block gradually increases or decreases along the drive shaft. A guide plate is slidably connected to the mounting base. The guide plate moves radially along the drive shaft and extends along the axial direction of the drive shaft. The guide plate abuts against the drive block, which is used to squeeze the guide plate to expand it outward until it contacts the inner wall of the front shaft hole of the high-pressure compressor and increases the friction between them, thereby achieving an outward expansion fixation. The portion of the guide plate away from the fixed end extends in a direction away from the axial direction of the drive shaft, and the end face of the guide plate away from the drive shaft is provided with a guide bevel. An elastic cable tie, which simultaneously covers the drive shaft and the guide plate, is used to shrink so that the effective diameter of the guide device is reduced, thereby achieving separation of the guide device; The drive block is provided with a limiting groove, the guide plate passes through the limiting groove, and the outer peripheral surface of the guide plate abuts against the limiting groove; The guide plate has a positioning column surface at the part away from the drive shaft. The positioning column surface extends radially along the drive shaft and is used to make the guide device and the front shaft hole of the high-pressure compressor abut against each other.

2. The guiding device as claimed in claim 1, characterized in that, The guide plate comprises multiple plates, which are evenly distributed and spliced ​​together to form a ring structure, and the drive shaft is located within the ring structure.

3. The guiding device as claimed in claim 1, characterized in that, The guiding device includes at least two mounting bases, with at least one mounting base disposed between the drive block and the drive end.

4. The guiding device as described in claim 3, characterized in that, The diameter of the drive shaft near the drive end is larger than the diameter near the fixed end. The drive shaft forms a stepped support platform, which abuts against the end face of the mounting base near the drive end. A nut is provided at the end of the drive shaft away from the drive end.

5. The guiding device as claimed in claim 1, characterized in that, The mounting base is provided with a positioning groove, the opening of the positioning groove extends in a direction away from the drive shaft, and the guide plate passes through the positioning groove.

6. The guiding device as claimed in claim 1, characterized in that, The mounting base includes a connecting pin, and the guide plate is provided with a guide groove, the connecting pin cooperating with the guide groove.

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