CN216803170U

CN216803170U - Centering device

Info

Publication number: CN216803170U
Application number: CN202220384973.XU
Authority: CN
Inventors: 郑思凯; 周宇乾; 张云鹏
Original assignee: AECC Commercial Aircraft Engine Co Ltd
Current assignee: AECC Commercial Aircraft Engine Co Ltd
Priority date: 2022-02-24
Filing date: 2022-02-24
Publication date: 2022-06-24
Anticipated expiration: 2032-02-24

Abstract

The utility model provides a centering device, which relates to the field of engine assembly, and comprises: the centering device comprises a shaft rod, a driving rod and an expansion part, wherein the driving rod is sleeved on the outer peripheral side of the shaft rod and can move along the shaft rod, the expansion part is rotatably connected with a first end of a connecting part, the connecting part is provided with a plurality of connecting parts, a part of second ends of the connecting parts are rotatably connected with the shaft rod, the rest part of second ends of the connecting parts are rotatably connected with the driving rod, the driving rod drives the expansion part to expand or contract through moving along the axial direction of the shaft rod, and the expansion part fixes the centering device in an expansion state. In this scheme, the actuating lever passes through connecting portion and drives the expansion of expansion portion or shrink, and the fixed of centering device can be realized to the expansion portion when the expansion state, and centering device overall structure is compact, and the shared space of axostylus axostyle and actuating lever is little, is difficult for bumping with the inside subassembly, safe and reliable, with the inside complicated environment phase-match of engine.

Description

Centering device

Technical Field

The utility model relates to the field of engine assembly, in particular to a centering device.

Background

As shown in fig. 1, the low pressure fulcrum assembly 100 'is used for connecting a fan rotor and a low pressure turbine rotor of an aircraft engine, and is installed on an intermediate casing 400', the installation position of the low pressure fulcrum assembly is about 1000mm away from the front installation edge of the fan casing 300 ', a labyrinth 500' structure is formed by a sealing ring at the tail end and a labyrinth on a front shaft of a compressor, and the radial gap is small and is about 0.2 mm. The low-pressure fulcrum assembly 100 'is installed in a horizontal hoisting mode, the connecting position of the low-pressure fulcrum assembly is located inside the fan casing 300', the installation is invisible, the radial clearance of the labyrinth sealing 500 'is small, accurate centering is difficult to achieve in the horizontal hoisting process of a crane, and during non-centering installation, a labyrinth on a front shaft of a gas compressor and a sealing ring at the rear end of the low-pressure fulcrum assembly 100' are scraped and touched to cause damage to the labyrinth, so that sealing failure is caused.

To achieve accurate centering of the low pressure fulcrum assembly 100', a secondary centering device is required, and a conventional secondary centering device is usually fixed to a part or assembly, and extends the axis of a shaft or hole in the part or assembly to match with a hole or shaft feature in another part or assembly to form a guide structure for guiding the two parts or assemblies to be accurately centered and assembled. Because the shape of the inner hole of the low-pressure fulcrum assembly 100 ' is complex, the minimum aperture is smaller than the aperture of the inner hole of the compressor front shaft 600 ', and in addition, the characteristic fixing auxiliary centering device which is easy to connect, such as no thread, is arranged on the compressor front shaft 600 '.

The existing auxiliary centering device has the following problems: the structure is complicated, and the volume of non-expansion part is great, collides with interior subassembly easily, can't match the inside complicated environment of engine to inconvenient taking out after accomplishing the guide.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of overcoming the defects that the centering device in the prior art is complex in structure, the non-expansion part is large in size, is easy to collide with an internal component, cannot be matched with the complex environment in an engine, and is inconvenient to take out after the guiding is finished.

The utility model solves the technical problems through the following technical scheme:

a centering device, comprising:

a shaft lever;

the driving rod is sleeved on the outer periphery of the shaft rod and can move along the shaft rod;

the expansion part is rotatably connected with the first end of the connecting part, the connecting part is provided with a plurality of connecting parts, the second end of one part of the connecting part is rotatably connected with the shaft rod, the second end of the rest part of the connecting part is rotatably connected with the driving rod, the driving rod drives the expansion part to expand or contract by moving along the axial direction of the shaft rod, and the expansion part fixes the centering device in an expanded state;

an elastic member bound to an outside of the expansion part.

In this scheme, the actuating lever passes through connecting portion and drives the expansion of expansion portion or shrink, and the fixed of centering device can be realized to the expansion portion when the expansion state, and the actuating lever cover is established in the periphery side of axostylus axostyle, realizes easily that centering device is fixed inside the part. The elastic component can keep the expansion part in an inward contraction state, can keep controlling the contraction of the expansion part through the driving rod after completing guiding and mounting, is free of fixation, facilitates taking out of the centering device from an inner hole of the engine, is compact in overall structure, small in occupied space of the shaft rod and the driving rod, not prone to colliding with an internal assembly, safe and reliable, and matched with a complex environment inside the engine.

Preferably, the expansion part comprises a first area and a second area, the first area is matched with an inner hole of a workpiece needing centering installation to form a shaft hole, and the second area is matched with the inside of the part and used for realizing the fixation of the centering device.

In the scheme, the first area can play a role in guiding the workpiece to be centered and installed, and the second area realizes the fixation of the centering device.

Preferably, at least a portion of the outer diameter of the second region is greater than the outer diameter of the first region; alternatively, at least a portion of the outer diameter of the first region is greater than the outer diameter of the second region.

Preferably, the expansion part comprises a plurality of expansion rods distributed on the outer periphery of the shaft, and each expansion rod is rotatably connected with the first end of the connecting part.

In this scheme, through synchronous shrink and the expansion of a plurality of expansion rods of connecting portion control, change centering device's profile diameter to realize that centering device's the fixed and contraction type of the tight formula that rises decomposes, set up a plurality of expansion rods and can keep the rigidity, avoid the work piece motion in-process extrusion centering device, lead to centering device inefficacy.

Preferably, the connecting portion is provided with an ear seat at a portion where the shaft lever and the driving lever are connected, and the connecting portion is connected with the ear seat through a connecting pin.

Preferably, one side of the expanding rod close to the shaft rod is provided with a receiving groove, and the width of the receiving groove is larger than that of the ear seat.

In this scheme, the expansion pole is when the shrink, and the ear seat can contain in the holding tank, and the shrink is accomplished the back, and the aperture of expansion portion outline is littleer, the separation of being convenient for.

Preferably, one side of the expansion rod close to the shaft rod is provided with a receiving groove, and the width of the receiving groove is the same as the width of the first end of the connecting part.

In this scheme, the skew can not take place for the expansion lever in the motion process, leads to the shaft hole cooperation to become invalid, and stability is high.

Preferably, the elastic member is provided in plurality in the axial direction of the shaft.

In this arrangement, the tightening force applied by the resilient member to the centering device is more uniform.

Preferably, the centering device further comprises a driving unit, the driving unit is disposed on the shaft and connected to the driving rod, and the driving unit is configured to drive the driving rod to move along the axial direction of the shaft.

Preferably, the driving unit includes a driving nut, the shaft lever is provided with a thread section matched with the driving nut, the driving nut is arranged in the thread section, a pin hole is formed in the circumferential direction of the driving nut, an annular groove is formed in one end, connected with the driving nut, of the driving rod, the annular groove is aligned with the pin hole, and the driving nut and the driving rod are inserted in the pin hole and connected with a bolt of the annular groove.

In this scheme, when drive nut rotated, the bolt can be at the annular internal rotation of actuating lever, converted the rotary motion of drive nut into the linear motion of actuating lever, and it is rotatory that the actuating lever can not follow drive nut, leads to the actuating lever to twist reverse the deformation to adopt screw thread transmission, have self-locking function.

The positive progress effects of the utility model are as follows: in this scheme, the actuating lever passes through connecting portion and drives the expansion of expansion portion or shrink, the expansion portion can realize the fixed of centering device when the expansion state, the actuating lever cover is established in the periphery side of axostylus axostyle, realize easily that centering device is fixed inside the part, accomplish the guide installation back, can control the contraction of expansion portion through the actuating lever, remove fixedly, make things convenient for the centering device to take out, overall structure is compact, the shared space of axostylus axostyle and actuating lever is little, be difficult for colliding with the inner assembly, safety and reliability, with the inside complicated environment phase-match of engine.

Drawings

FIG. 1 is a schematic view of a prior art engine low pressure pivot assembly connection;

FIG. 2 is a schematic structural diagram of a centering device according to a preferred embodiment of the present invention;

FIG. 3 is a cross-sectional view of a centering device according to a preferred embodiment of the present invention;

FIG. 4 is a partially exploded view of the centering device according to the preferred embodiment of the present invention;

FIG. 5 is an enlarged partial structural view of a centering device according to a preferred embodiment of the present invention;

FIG. 6 is a schematic cross-sectional view of FIG. 5 according to the present invention;

FIG. 7 is a schematic view of a centering device according to a preferred embodiment of the present invention.

Shaft 100

Threaded segment 110

Drive rod 200

Ring groove 210

Expansion part 300

Expansion rod 310

Accommodating groove 311

First region 312

Second region 313

Drive nut 400

Bolt 410

Elastic member 500

Connecting part 600

First end 610

Second end 620

Ear mount 700

Low pressure fulcrum assembly front axle bore 810

Compressor front shaft 820

Detailed Description

The present invention will be more clearly and completely described in the following description of preferred embodiments, taken in conjunction with the accompanying drawings.

As shown in fig. 2 to 7, in the present embodiment, there is provided a centering device including:

a shaft 100;

a drive rod 200 which is sleeved on the outer periphery of the shaft lever 100 and can move along the shaft lever 100;

the expansion part 300, the expansion part 300 is connected with the first end 610 of connecting portion 600 is rotated, and the connecting portion has a plurality ofly, and the second end 620 of some connecting portion 600 is connected with axostylus axostyle 100 is rotated, and the second end 620 of remaining connecting portion 600 is connected with the actuating lever 200 is rotated, and the actuating lever 200 is through moving along the axial direction of axostylus axostyle 100 and drive the expansion part 300 expansion or shrink, and the expansion part 300 realizes the fixed of centering device under the expanded state.

And an elastic member 500, the elastic member 500 being bound to the outside of the expansion part 300.

In this embodiment, the connecting portion is a connecting rod.

In other embodiments, the connecting portion may also adopt a rotating block or other components capable of realizing relative rotation according to requirements.

Specifically, as shown in fig. 2 and 3, the end of the shaft 100 is connected to the expansion part 300 through a connection part 600, and a plurality of connection parts 600 are provided between the driving rod 200 and the expansion part 300, so that when the driving rod 200 moves up and down along the shaft 100, the expansion part 300 can be expanded or contracted.

In this scheme, the drive lever 200 drives the expansion part 300 through the connecting part 600 to expand or contract, the expansion part 300 can realize the fixation of the centering device when in an expansion state, the drive lever 200 is sleeved on the periphery side of the shaft lever 100, the operation is convenient, and the fixation of the centering device in the part is easily realized. The elastic component 500 can keep the expansion part 300 in an inward contraction state, after guiding and installation are completed, the expansion part 300 can be controlled to contract through the driving rod 200, fixation is removed, the centering device can be conveniently taken out of an inner hole of an engine, the whole structure is compact, the occupied space of the shaft rod 100 and the driving rod 200 is small, the centering device is not easy to collide with internal components of the engine, the centering device is safe and reliable and is matched with the complex internal environment of the engine, and the centering device is simple in structure, convenient to operate and low in process cost.

In the present embodiment, as shown in fig. 2 and 3, the expansion part 300 includes a plurality of expansion rods 310 distributed on the outer circumferential side of the shaft 100, and each expansion rod 310 is rotatably coupled to the first end 610 of the coupling part 600. Synchronous shrink and expansion of a plurality of expansion rods 310 are controlled through connecting portion 600, the profile diameter of the centering device is changed, thereby realizing the tension type fixing and contraction type decomposition of the centering device, setting up a plurality of expansion rods 310 to keep rigidity, and avoiding the centering device from being extruded in the movement process of the workpiece, resulting in the failure of the centering device.

In the present embodiment, as shown in fig. 2 and 3, the elastic member 500 is provided in plurality in the axial direction of the shaft 100.

As shown in fig. 4, in the present embodiment, an ear seat 700 is provided at a portion where the connecting portion 600 is connected to the shaft 100 and the driving lever 200, and the connecting portion 600 is connected to the ear seat 700 by a connecting pin.

In this embodiment, the expansion rod 310 is provided with a receiving slot 311 at a side thereof adjacent to the shaft 100, and the receiving slot 311 has a slot width equal to the width of the first end 610 of the connection part 600. The expansion rod 310 can not deviate in the movement process, so that the shaft hole matching fails, and the stability is high.

In this embodiment, the side of the expanding rod 310 close to the shaft 100 is provided with a receiving slot 311, and the width of the receiving slot 311 is larger than the width of the ear seat 700. When the expansion rod 310 is contracted, the ear mount 700 can be contained in the receiving slot 311, and after the contraction is completed, the aperture of the outer contour of the expansion part 300 is smaller, which is convenient for separation.

In the present embodiment, as shown in fig. 2, 3, 5 and 6, the centering device further includes a driving unit disposed on the shaft 100 and connected to the driving rod 200, the driving unit being configured to drive the driving rod 200 to move along the axial direction of the shaft 100.

In this embodiment, the driving unit includes a driving nut 400, the shaft rod 100 is provided with a threaded section 110 matching with the driving nut 400, the driving nut 400 is provided on the threaded section 110, a pin hole is provided on the circumference of the driving nut 400, an annular groove 210 is provided at one end of the driving rod 200 connected to the driving nut 400, the annular groove 210 is aligned with the pin hole, and the driving nut 400 is connected to the driving rod 200 through a pin 410 inserted into the pin hole and the annular groove 210. When the driving nut 400 rotates, the plug pin 410 can rotate in the annular groove 210 of the driving rod 200, the rotating motion of the driving nut 400 is converted into the linear motion of the driving rod 200, the driving rod 200 cannot rotate along with the driving nut 400, the driving rod 200 is twisted and deformed, and the self-locking function is achieved by adopting thread transmission.

In other embodiments, the drive nut 400 and the drive rod 200 may be coupled by bearings.

In other embodiments, the driving unit may control the movement of the driving rod 200 along the shaft 100 by installing a linear motion mechanism, such as an electric push rod, at the end of the driving rod 200.

In other embodiments, the driving unit may not be provided, and the driving rod 200 may be directly pushed to move along the shaft 100.

As shown in fig. 7, the expansion part 300 includes a first area 312 and a second area 313, the first area 312 is matched with the inner hole of the workpiece to be centered and installed to form a shaft hole, and the second area 313 is matched with the inner part of the part to realize the fixation of the centering device.

Specifically, first region 312 cooperates with low pressure fulcrum subassembly front axle hole 810, and first region 312 can play the guide effect to first fulcrum subassembly, can realize the accurate centering installation of low pressure fulcrum subassembly, avoids scraping and hits the loss part. The outer diameter of the second region 313 is larger than that of the first region 312, the second region 313 is matched with an inner hole of the compressor front shaft 820, and in the expansion state, the second region 313 is in tight fit with the inner hole of the compressor front shaft 820, so that the centering device is fixed.

In this embodiment, at least a portion of the outer diameter of the second region 313 is larger than the outer diameter of the first region 312.

In other embodiments, at least a portion of the outer diameter of the first region 312 is larger than the outer diameter of the second region 313, depending on the particular workpiece and internal part to be centered

In other embodiments, the outer diameters of the first region 312 and the second region 313 may be the same, depending on the particular workpiece and internal part to be centered.

Claims

1. A centering device, comprising:

a shaft lever;

an elastic member bound to an outside of the expansion part.

2. Centering device according to claim 1, characterized in that the expansion comprises a first region which forms a shaft hole in the workpiece to be centered and a second region which engages the inside of the part for the purpose of fixing the centering device.

3. The centering device of claim 2, wherein at least a portion of the outer diameter of said second region is greater than the outer diameter of said first region; alternatively, at least a portion of the outer diameter of the first region is greater than the outer diameter of the second region.

4. The centering device of claim 1, wherein said expansion portion includes a plurality of expansion rods distributed about an outer periphery of said shaft, each of said expansion rods being rotatably coupled to said first end of said coupling portion.

5. The centering device as claimed in claim 4, wherein an ear seat is provided at a portion where said connecting portion is connected to said shaft rod and said driving rod, and said connecting portion is connected to said ear seat by a connecting pin.

6. The centering device of claim 5, wherein a side of said expansion rod adjacent said shaft is provided with a receiving groove having a groove width greater than a width of said ear mount.

7. The centering device of claim 4, wherein a side of said expansion rod adjacent to said shaft is provided with a receiving groove having a groove width equal to a width of said first end of said connecting portion.

8. The centering device of claim 1, wherein said elastic member is provided in plurality in the axial direction of said shaft.

9. The centering device according to claim 1, further comprising a driving unit provided on the shaft and connected to the driving rod, the driving unit being configured to drive the driving rod to move in an axial direction of the shaft.

10. The centering device as claimed in claim 9, wherein said driving unit comprises a driving nut, said shaft rod is provided with a threaded section matching with said driving nut, said driving nut is provided in said threaded section, said driving nut is provided with a pin hole circumferentially, one end of said driving rod connected to said driving nut is provided with a ring groove, said ring groove is aligned with said pin hole, said driving nut and said driving rod are connected by a pin inserted in said pin hole and said ring groove.