CN214250824U

CN214250824U - Blade tip diameter measuring tool

Info

Publication number: CN214250824U
Application number: CN202120646242.3U
Authority: CN
Inventors: 姜祖岗; 徐虹艳; 马莹
Original assignee: AECC Commercial Aircraft Engine Co Ltd
Current assignee: AECC Commercial Aircraft Engine Co Ltd
Priority date: 2021-03-30
Filing date: 2021-03-30
Publication date: 2021-09-21
Anticipated expiration: 2031-03-30

Abstract

A tip diameter measuring tool for measuring a tip diameter of a turbine rotor includes a bracket for fixedly disposing on a turbine rotor disk, the bracket including a locating block; the outer support component is arranged on the positioning block and used for outputting radial motion to support the blade; and a measuring part which is arranged on the positioning block in a radially movable manner and is used for contacting the blade tip of the blade. The tip diameter measuring tool can eliminate the connecting gap between the blade of the turbine rotor and the turbine rotor disc, so that the tip diameter of the turbine rotor can be accurately obtained, the measuring result can be directly interpreted, the measuring error caused by the position deviation of the ruler table in the traditional measurement is avoided, and the measuring accuracy is improved.

Description

Blade tip diameter measuring tool

Technical Field

The utility model relates to a measure the frock field, concretely relates to apex diameter measurement frock field.

Background

The high-pressure turbine rotor unit body is a main acting part of an aeroengine and generally comprises a drum barrel, a sealing disc, a turbine disc, rotor blades, a rear baffle, a rear shaft and the like. The turbine rotor stator clearance (blade tip clearance) directly influences the working characteristics of the turbine, and therefore the overall performance of the engine is influenced. Excessive tip clearances reduce turbine efficiency, leading to increased specific thrust fuel consumption and increased gas temperatures; too small a tip clearance can cause the turbine blades to rub against the inner wall of the casing, causing vibration. In order to control the clearance between the blade and the casing and ensure the performance and the safety of the engine, the cold-state blade tip clearance needs to be controlled to ensure the optimal clearance value under the working state, and the cold-state blade tip clearance needs to be obtained after the calculation of measuring the blade tip diameter of the high-pressure turbine rotor and the inner diameter of the casing, so the measurement value of the blade tip diameter needs to be accurate.

The high-pressure turbine rotor blade is generally inserted into a fir-tree-shaped groove of the turbine disk through a fir-tree-shaped tenon, and a certain clearance exists between the tenon and the mortise. In order to accurately measure the diameter of the tip of the high-pressure turbine, the connecting clearance between the blade and the turbine disc needs to be removed outwards before measurement. The diameter of the blade tip of the high-pressure turbine rotor is generally measured during assembly or disassembly of an engine, and the traditional method for removing the blade connecting gap outwards is to pinch a blade basin and a blade back of the blade by hands, apply force outwards, and reduce the blade connecting gap under the action of external drag force. In the whole process, the influence of elements is large, the force application size and the force application direction are different from person to person, and the blade connection gap is difficult to eliminate, so that the measured value of the diameter of the blade tip is extremely unstable, and the accurate value of the diameter of the blade tip cannot be obtained.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide apex diameter measuring tool to accurate, the rapid survey is measured out the apex diameter.

The blade tip diameter measuring tool for achieving the purpose comprises a bracket, a positioning block and a measuring tool, wherein the bracket is fixedly arranged on a turbine rotor disc; the outer support component is arranged on the positioning block and used for outputting radial motion and supporting the blades; and the measuring component is arranged on the positioning block in a radially movable mode and is used for contacting the blade tip of the blade.

In one or more embodiments, the support further comprises a connecting device for connecting the two positioning blocks, the connecting device is used for crossing the center of the turbine rotor, and the positioning blocks comprise radial extensions extending from two ends of the diameter of the support and positioning bases for fixing on the turbine rotor disc.

In one or more embodiments, the outer supporting part includes a driving part and a fastening part, the fastening part is used for fastening the blade, and the driving part is used for driving the fastening part to move radially outwards so as to output the radial movement.

In one or more embodiments, the driving part is an adjusting bolt penetrating through the positioning base, and a tail of the adjusting bolt abuts against the abutting part.

In one or more embodiments, the fastening component is a hook claw, and the hook claw is slidably connected with the radial extension part and used for fastening a flange plate of the blade.

In one or more embodiments, the fastening component is an expansion block, and the expansion block is slidably connected with the radial extension part and can move up and down to fasten a tenon of the blade.

In one or more embodiments, the turbine rotor disk provides a ring of annular grooves concentric with the turbine rotor disk, and the positioning base includes a catch that is a sliding fit with the annular grooves.

In one or more embodiments, the measurement member is slidably disposed on the radial extension, which provides a scale marking for identifying the location of the measurement member.

In one or more embodiments, the measuring member includes a slider slidably connected to the radial extension and a measuring head fixedly connected to the slider for contacting the blade tip.

In one or more embodiments, the slider includes an inner cavity that is a sliding fit with the profile of the radially extending portion.

In one or more embodiments, the length of the connecting means is adjustable.

In one or more embodiments, the connecting device includes a cross bar and longitudinal bars intersecting with both ends of the cross bar, the two longitudinal bars are respectively connected with the positioning bases of the two positioning blocks, and the length of the cross bar is adjustable.

The blade tip diameter measuring tool is fixedly arranged on the turbine rotor disc through the support, the blades are effectively externally supported through the externally supporting part connected with the positioning block on the support, the connecting gap between the blades of the turbine rotor and the turbine rotor disc is eliminated, and the measuring result can be directly interpreted through the measuring part, so that the blade tip diameter of the turbine rotor is quickly and accurately obtained, the measuring error caused by the position deviation of a ruler table in the traditional measurement is avoided, and the measuring accuracy is improved.

Drawings

The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings, in which:

FIG. 1 is a schematic, fragmentary, structural view of a high pressure turbine rotor;

FIG. 2 is a schematic structural view of an embodiment of a tip diameter measurement tool;

FIG. 3 is a cross-sectional view of an embodiment of a tip diameter measurement tool;

FIG. 4 is an oblique view of an embodiment of a tip diameter measurement tool in a measurement condition;

FIG. 5 is a front view of an embodiment of a tip diameter measurement tool in a measurement condition;

FIG. 6 is a flow chart illustrating the steps for using the tip diameter measurement tool.

Description of symbol mark

1 support

2 external support component

3 measuring part

8 rear axle

9 connecting gap

12 locating block

13 connecting device

14 radial extension

15 positioning base

17 adjusting bolt

20 turbine rotor disk

21 drive part

22 abutting part

28 hook claw

29 ring groove

30 blade

31 blade tip

32 edge plate

33 tenon

34 tongue-and-groove

35 sliding block

36 measuring head

37-scale reticle

131 cross bar

132 longitudinal bar

141 chute

151 jack catch

281 blocking part

351 inner cavity

361 measuring head indicating line

Detailed Description

The present invention will be further described with reference to the following embodiments and drawings, and more details will be set forth in the following description in order to provide a thorough understanding of the present invention, but it is obvious that the present invention can be implemented in various other ways different from those described herein, and those skilled in the art can make similar generalizations and deductions according to the actual application without departing from the spirit of the present invention, and therefore, the scope of the present invention should not be limited by the contents of the embodiments. It should be noted that these and other figures are given by way of example only and are not drawn to scale, and should not be construed as limiting the scope of the invention as it is actually claimed.

The turbine rotor as shown in FIG. 1 includes blades 30, a turbine rotor disk 20, and an aft shaft 8. After the blade 30 is mounted on the turbine rotor disk 20, a joint gap 9 exists between the tenon 33 of the blade 30 and the bottom of the mortise 34 of the turbine rotor disk 20, and the joint gap 9 needs to be eliminated when measuring the tip diameter to obtain an accurate tip diameter measurement. The tip diameter is the diameter of the circle defined by the tips 31 of all the blades 30 of the turbine rotor in the operating state. In one embodiment, the tip diameter is the distance between the tips 31 of the blades 30 at both ends of the diameter of the turbine rotor disk 20 when the turbine rotor is in operation. The latter embodiment simulates the operating conditions of the blade 30 by eliminating the connecting gap 9.

As shown in FIG. 2, the tip diameter measuring tool for measuring the tip diameter of a turbine rotor comprises a bracket 1, an outer support member 2 and a measuring member 3. The support 1 is used for being fixedly arranged on a turbine rotor disc 20, and the support 1 comprises a positioning block 12. The outer bracing member 2 is provided on the positioning block 12 and serves to output radial movement to brace the vanes 30. The measuring element 3 is arranged radially movably on the positioning block 12 for contacting the tip 31 of the blade 30. The result of the blade tip diameter measurement value can be rapidly judged and read through the direct measurement of the blade tip 31 by the measuring component 3 positioned on the positioning block 12.

For example, the blade tip 31 is measured by the measuring part 3 on the positioning block 12, and the distance of the blade tip 31 on the diameter side is obtained, and the distance is twice as long as the diameter of the turbine rotor disk 20, that is, the blade tip diameter data.

Referring to fig. 2 and 3, the bracket 1 is provided with two positioning blocks 12, and the distance between the tips 31 at two ends of the diameter can be directly measured through the two positioning blocks 12, which is efficient and convenient. The bracket 1 further comprises a connecting device 13 for connecting the two positioning blocks 12, the connecting device 13 is used for crossing the center of the turbine rotor, for example, the connecting device 13 can cross the rear shaft 8 shown in fig. 1, so that the blade tip diameter measuring tool can be accurately positioned, and the influence of parts such as the high-pressure turbine rear shaft 8 on measurement is effectively avoided.

In other embodiments, the connecting device 13 may have other shapes, such as an arc-shaped structure, as long as the connecting device 13 can cross the center of the turbine rotor to effectively avoid the influence of the parts such as the rear shaft 8 on the measurement.

Meanwhile, since the connecting device 13 provides two positioning blocks 12 at both ends, the outer support member 2 and the measuring member 3 located on the positioning blocks 12 are also two. Through setting up connecting device 13 along diameter direction, can guarantee that measuring part 3 and external stay part 2 follow diameter direction all the time, have saved the step of artifical judgement diameter, consequently can be more quick and convenient acquire the data of apex diameter to save and improve measurement accuracy.

Preferably, the positioning block 12 comprises a radial extension 14 extending from the support 1 at both ends of the diameter and a positioning base 15 for fixing to the turbine rotor disk 20. The radial extension 14 and the positioning base 15 may be integrally provided or may be detachably connected.

One way of fixedly connecting the turbine rotor disk 20 to the positioning base 15 can be seen in fig. 4, in which the turbine rotor disk 20 is provided with a ring of annular grooves 29, the annular grooves 29 are concentric with the turbine rotor disk 20, and the positioning base 15 includes a catch 151, and the catch 151 is slidably engaged with the annular grooves 29 to realize the connection of the positioning base 15 on the turbine rotor disk 20.

One embodiment of the ring groove 29 is a turbine disk backplate mounting spigot. Through the sliding fit of jack catch 151 and annular 29, apex diameter measuring tool can slide in annular 29, therefore measuring part 3 can rotate to different angular position, measures a pair of blade 30 that is located different positions to can measure turbine rotor's apex diameter under a plurality of angular orientation, effectively improve measurement accuracy. The ring groove 29 can also be selected from other sliding grooves on the turbine disc as long as the function of tight fit with the jaws 151 is achieved.

As shown in fig. 2 to 4, the outer support member 2 includes a driving member 21 and an abutting member 22. The abutting part 22 is used for abutting against the blade 30, and the driving part 21 is used for driving the abutting part 22 to move radially outwards so as to output radial movement.

In the embodiment shown in fig. 3, the driving member 21 is an adjusting bolt 17 penetrating the positioning base 15, the fastening member 22 is a hook 28, and the hook 28 is fastened to the rim plate 32 of the blade 30. The tail of the adjusting bolt 17 abuts against the hook 28 to adjust the radial position of the hook 28. At the same time, the hook claw 28 is slidably connected with the radially extending portion 14, enabling a change in radial position. The outwardly moving hook claw 28 applies a radially outward force to the platform 32 of the blade 30, thereby pushing the blade 30 outwardly and eliminating the joint gap 9 between the blade 30 and the turbine rotor disk 20.

One embodiment of the hook 28 engaged with the radially extending portion 14 is shown in fig. 3 and 4, a sliding slot 141 is radially opened on the radially extending portion 14, the hook 28 can move in the sliding slot 141, and a blocking portion 281 is disposed at one end of the hook 28, so that the hook 28 can be slidably fixed on the sliding slot 141 through the blocking portion 281 while penetrating through the sliding slot 141, thereby preventing the hook 28 from falling off, and achieving the sliding connection. When the adjusting bolt 17 is screwed, the head of the adjusting bolt 17 abuts against the surface of the hook 28 and pushes the hook 28 in the radial direction, and the hook 28 slides in the lower slide groove 141 under the action of the pushing force to output radial movement to the blade 30 and abuts against the flange plate 32 of the blade 30, so that the connection gap 9 between the blade tenon 33 and the mortise 34 is eliminated, and the diameter of the blade tip of the turbine rotor is accurately obtained.

The sliding engagement of the hook 28 with the radially extending portion 14 includes, but is not limited to, the above-mentioned embodiments, for example, the sliding of the hook 28 on the radially extending portion 14 is realized by the engagement of a slide rail and a pulley, or the like, or the sliding engagement of the hook 28 inside a groove is realized by providing a groove or the like that does not penetrate through the radially extending portion 14. Thus, embodiments that function as a sliding fit of the catch 28 with the radially extending portion 14 are applicable to the present disclosure.

The tightening member 22 may be an expanding block (not shown) slidably connected to the radially extending portion 14 and movable up and down, the expanding block serving to tighten the tenon 33 of the vane 30. The adjusting bolt 17 is screwed, and the adjusting bolt 17 drives the expansion block to move outwards in the radial direction, so that the expansion block is pressed into the connecting gap 9 between the tenon 33 and the mortise 34 when the expansion block is adjusted to be positioned at the connecting gap 9. The adjusting bolt 17 is continuously screwed, the driving part 21 drives the expansion block to continuously move outwards in the radial direction, the expansion block transmits the thrust of the outward radial movement to the tenon 33, and the measurement error caused by the connecting gap 9 can be eliminated.

As shown in fig. 4 and 5, the measuring unit 3 includes a slide block 35 and a measuring head 36 fixedly connected to the slide block 35, the slide block 35 is slidably connected to the radial extension 14, and the measuring head 36 is used for contacting the blade tip 31. In one embodiment where the slider 35 is engaged with the radially extending portion 14, the slider 35 includes an inner cavity 351, the inner cavity 351 being in sliding engagement with the outer contour of the radially extending portion 14 such that the slider 35 is slidably disposed on the radially extending portion 14. In other embodiments, the sliding block 35 may be slidably connected to the radially extending portion 14 by engaging with a sliding slot formed on the radially extending portion 14.

The slide 35 and the measuring head 36 may be integrally provided or may be detachably connected. Preferably, the slide block 35 of the measuring unit 3 is provided with a measuring head indicating line 361 for identifying the position of the measuring head 36 to improve the measuring accuracy. At the same time, the radial extension 14 provides a scale score line 37 for identifying the position of the measurement member 3 to facilitate direct reading of the tip diameter measurement.

Referring to fig. 4, after two measuring heads 36 at 180 degrees are respectively in contact with two blade tips 31, the scale mark indicating value of the position of the blade tip 31 can be determined by identifying the scale mark 37 on the radially extending portion 14 and the measuring head indicating line 361 on the slide block 35. By identifying a pair of readings of the scale markings 37 and simple calculation, a measurement of the turbine rotor tip diameter can be taken directly. For example, the starting point of the scale reticle 37 on one side is 0, and by moving the measurement head 36, a position reading of-X1 can be taken. The starting point of the scale reticle on the other side is L, which is the diameter of the turbine rotor disk, and by moving the measuring head 36, a position reading X2 can be taken. And subtracting the two position degrees-X1 and X2 to obtain the measured value of the diameter of the blade tip of the turbine rotor.

The scale lines are arranged in a manner including, but not limited to, the above-mentioned embodiment, for example, the starting point of the scale lines on both sides is 0, and the tip positions X1 and X2 on both sides can be obtained by moving the measuring heads 36 on both ends, respectively. A measurement of the turbine rotor tip diameter may also be obtained by adding X1 and X2 to the diameter L of the turbine rotor disk.

Because the two measuring points are always at 180 degrees, the phenomenon that an operator needs to repeatedly adjust the measuring angle to search for the maximum point when the diameter is measured by a traditional outside micrometer in a mode of directly reading by a pair of measuring heads can be avoided, the measured value of the diameter of the blade tip of the turbine rotor can be quickly obtained, and meanwhile, the artificial measuring error is also avoided.

Preferably, the length of the connecting means 13 is adjustable. With continued reference to fig. 4 and 5, the connecting device 13 includes a cross bar 131 and longitudinal bars 132 intersecting with both ends of the cross bar, the two longitudinal bars 132 are respectively connected with the positioning bases 15 of the two positioning blocks 12, and the length of the cross bar 131 is adjustable. For example, the cross bar 131 is a bidirectional screw, so that when the measured dimensions of the turbine rotor disks are different, the length of the cross bar 131 can be adjusted by rotating the bidirectional screw, so that the tip diameter measuring tool is universally applicable to various turbine rotor disks.

The procedure for using the tip diameter measurement tool is described below with reference to fig. 6.

Step 201 is performed first to move the measuring part 3, and move the measuring part 3 to the outermost side of the radial extension 14, so as to avoid interference between the measuring part 3 and the blade 30 when the tip diameter measuring tool is placed on the turbine rotor disk 20.

Then, step 202 is performed to move the abutting member 22. The two adjusting bolts 17 are loosened, and the hook claw 28 is moved to the inner side of the radial extension portion 14, so that the hook claw 28 is prevented from interfering with the blade 30 when the tip diameter measuring tool is placed on the turbine rotor disc 20, and the blade 30 is prevented from being affected thereby.

The process then proceeds to step 203 where the measurement tool is installed. By placing the tip diameter measuring tool on the turbine rotor disk 20 and positioning it by the engagement of the claws 151 with the ring grooves 29, the two measuring parts 3 will be aligned with any two blades 30 spaced 180 degrees apart.

Step 204 is then performed to eliminate the connection gap 9. The two adjusting bolts 17 are respectively tightened, so that the hook claws 28 move radially outward and abut against the flange plates 32 of the blades 30, and the connection gap 9 between the blades 30 and the turbine rotor disc 20 is eliminated.

The measurement head 36 is then moved to the blade tip 31 position in step 205. The two sliders 35 are moved towards the inside of the radial extension 14 until the measuring head 36 comes into contact with the blade tip 31.

Then, in step 206, the values are read and the tip diameter is calculated. The scale lines 37 indicating the positions of the two measuring heads 36 are read, and the difference between the two values is the measured value of the tip diameter of the turbine rotor.

Finally, step 207 is performed to move the measuring tool to the next measuring point. And (5) repeating the step 201 and the step 202, and after the tip diameter measuring tool is randomly rotated to the next pair of blades 30, repeating the step 203 to the step 206 to measure the tip diameter at the angle.

The tip diameter measuring tool can effectively eliminate the connecting gap between the blade of the turbine rotor and the turbine rotor disc through the outer supporting component, and the difference value of the indicated values of the two scale marks of the two measuring heads at the tip positions is the tip diameter of the turbine rotor, so that the tip diameter of the turbine rotor can be accurately obtained, the tip diameter of the turbine rotor can be measured at a plurality of angular positions, and the measuring precision is improved.

Further, through setting up connecting device, effectively keep away parts such as high-pressure turbine's rear axle to the influence of measuring, and connecting device connects and has two measuring points on the diameter direction, and two measuring points can be in 180 degrees all the time for the measuring result is the measured value of apex diameter promptly, has avoided the measuring error that leads to because of ruler table position deviation among the traditional measurement process. In addition, this apex diameter measuring tool simple structure, convenient operation, measurement of efficiency is high.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention, all without departing from the content of the technical solution of the present invention, fall within the scope of protection defined by the claims of the present invention.

Claims

1. A tip diameter measurement tool for measuring a tip diameter of a turbine rotor, comprising:

the support (1) is used for being fixedly arranged on a turbine rotor disc (20) and comprises a positioning block (12);

an outer support part (2) arranged on the positioning block (12) and used for outputting radial movement and supporting the blades (30); and

a measuring part (3) arranged on the positioning block (12) in a radially movable manner for contacting a blade tip (31) of the blade (30).

2. The tool for measuring the tip diameter according to claim 1, characterized in that the support (1) further comprises a connecting device (13) for connecting the positioning block (12), the connecting device (13) being adapted to span the center of the turbine rotor, the positioning block (12) comprising a radial extension (14) of the support (1) extending at both ends of the diameter and a positioning base (15) adapted to be fixed to the turbine rotor disk (20).

3. The tip diameter measuring tool according to claim 2, characterized in that the outer support member (2) comprises a driving member (21) and a tightening member (22), the tightening member (22) is used for tightening the blade (30), and the driving member (21) is used for driving the tightening member (22) to move radially outwards to output the radial movement.

4. The tool for measuring the diameter of the blade tip as claimed in claim 3, characterized in that the driving member (21) is an adjusting bolt (17) penetrating through the positioning base (15), and the tail part of the adjusting bolt (17) abuts against the abutting member (22).

5. The tool according to claim 3, characterized in that said abutment member (22) is a hook (28), said hook (28) being slidably connected to said radial extension (14) for abutting against a flange (32) of said blade (30).

6. The tool for measuring the tip diameter according to claim 3, characterized in that the tightening member (22) is an expanded block slidably connected to the radial extension (14) and movable up and down for tightening the tenon (33) of the blade (30).

7. The tool according to claim 2, characterized in that the turbine rotor disc (20) is provided with a ring of annular grooves (29), the annular grooves (29) being concentric with the turbine rotor disc (20), the positioning base (15) comprising jaws (151), the jaws (151) being in sliding engagement with the annular grooves (29).

8. The tip diameter measuring tool according to claim 2, characterized in that the measuring member (3) is slidably arranged on the radial extension (14), the radial extension (14) providing a scale marking line (37) for identifying the position of the measuring member (3).

9. The tip diameter measuring tool according to claim 8, characterized in that the measuring member (3) comprises a slide (35) and a measuring head (36) fixedly connected to the slide (35), the slide (35) being slidably connected to the radial extension (14), the measuring head (36) being adapted to contact the tip (31).

10. The tip diameter measurement tool according to claim 9, wherein the slide block (35) includes an inner cavity (351), the inner cavity (351) being in sliding engagement with the profile of the radial extension (14).

11. The tip diameter measuring tool according to claim 2, characterized in that the length of the connecting means (13) is adjustable.

12. The tip diameter measuring tool according to claim 11, wherein the connecting device (13) comprises a cross bar (131) and longitudinal bars (132) intersecting with both ends of the cross bar (131), the longitudinal bars (132) are respectively connected with the positioning bases (15) of the positioning blocks (12), and the length of the cross bar (131) is adjustable.