JP2003315021A - Measurement method and measuring apparatus for work gap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily accurately measure the value of the gap between the inner periphery surface of a casing and the outer periphery surface of a rotor over the entire periphery. <P>SOLUTION: A subassembly comprising a compressor wheel 16 of a turbo fan engine, a gas generator case 27, and a centrifugal shroud 28 is supported at a base member 51 and a center shaft 52. A telecentric optical system CCD camera 62 that is supported at a movable ring 56 that is rotatably supported at an annular flange 27a at the upper end of a gas generator case 27 via a stay 61 is arranged opposite to the gap between the compressor wheel 16 and the centrifugal shroud 28. When the movable ring 56 is rotated by 360° in this state, the CCD camera 62 moves along the annular gap, thus measuring the value of the gap over the entire periphery. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work gap for measuring the size of the gap between the inner peripheral surface of a casing and the outer peripheral surface of a rotor rotatably housed inside the casing over the entire circumference. The present invention relates to a measuring method and a work gap measuring device used directly for carrying out the method.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication (Kokai) No. 8-304061 discloses a technique in which a gap gauge having a wedge-shaped tip is used for measuring the gap between the tip of a rotor of a rotary machine and the inner peripheral surface of a casing. .

Further, in Japanese Patent Laid-Open No. 5-118805,
In order to measure the clearance between the tip of the turbine blade in a jet engine and the inner peripheral surface of the casing, insert the probe toward the tip of the turbine blade from the through hole formed in the casing, and insert the probe between the tip of the turbine blade and the probe. Describes measuring the size of the gap based on the position of the probe when a discharge occurs.

[0004]

By the way, the above-mentioned Japanese Unexamined Patent Application Publication No.
In the one described in Japanese Patent Publication No. -304061, it is necessary for an operator to insert a gap gauge into a gap to be measured, and therefore, the gap must be measured for each of many blades of a turbine wheel or a compressor wheel. There is a problem that it takes a lot of labor and time to carry out.

Further, the work described in Japanese Patent Laid-Open No. 5-118805 is troublesome because it is necessary to measure the probe by moving the probe close to and away from each of a large number of turbine blades. If the shape of the casing is not guaranteed to be a perfect circle, it is necessary to move the position of the probe to a plurality of positions in the circumferential direction of the casing and repeat the measurement for each turbine blade each time. There was a problem that the work became more troublesome.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to make it possible to easily and accurately measure the size of the gap between the inner peripheral surface of the casing and the outer peripheral surface of the rotor over the entire circumference. To aim.

[0007]

In order to achieve the above object, according to the invention described in claim 1, an inner peripheral surface of a casing and an outer periphery of a rotor rotatably housed inside the casing. In the method of measuring the gap of a work that measures the size of the gap between the surface and the entire circumference, by moving the telecentric optical system camera facing the gap with the circular opening of the casing as a guide, There is proposed a work gap measuring method, which is characterized in that the size is measured over the entire circumference.

According to the above construction, the telecentric optical system camera is moved with the circular opening of the casing as a guide in a state of facing the gap between the inner peripheral surface of the casing and the outer peripheral surface of the rotor. The size of the gap can be easily and precisely measured over the entire circumference without requiring a special guide member for guiding the movement of the camera. Moreover, since the telecentric optical system camera is used, there is no error in the image size even if the shooting distance changes, and the accuracy of measuring the gap is further improved.

According to the invention described in claim 2,
In a work clearance measuring device that measures the size of the clearance between the inner surface of the casing and the outer surface of the rotor rotatably housed inside the casing over the entire circumference, assemble the casing and rotor coaxially. It is provided with a work supporting means for supporting the movable ring in a closed state, a movable ring rotatably supported along the circular opening of the casing, and a telecentric optical system camera supported by the movable ring via position adjusting means. There is proposed a work clearance measuring device characterized in that a size of a clearance is measured over the entire circumference by rotating a ring along a circular opening of a casing.

According to the above construction, the casing and the rotor are supported coaxially by the work supporting means in a state of being assembled,
Since the telecentric optical system camera is supported by the movable ring that is rotatably supported along the circular opening of the casing through the position adjusting means, the telecentric optical system camera is rotated by rotating the movable ring. By moving along the gap between the rotor and the outer peripheral surface of the rotor, the size of the gap can be measured easily and precisely over the entire circumference. Also, since the telecentric optical system camera is moved using the circular opening of the casing as a guide,
Since no special guide member is required, the number of defective parts can be reduced, and the position of the telecentric optical system camera can be adjusted through the position adjusting means, so that the telecentric optical system camera can be correctly opposed to the gap. Measurement accuracy can be improved. Further, by using the telecentric optical system camera, even if the shooting distance is changed, the error in the image size does not occur, and the measurement accuracy of the gap is further improved.

According to the invention described in claim 3,
In addition to the configuration of claim 2, there is proposed a work gap measuring device characterized by displaying an enlarged image of the gap taken by a telecentric optical system camera on a television display together with a scale.

According to the above arrangement, the enlarged image of the gap taken by the telecentric optical system camera is displayed on the television display together with the scale, so that the state of the gap can be easily visually checked.

According to the invention described in claim 4,
In addition to the configuration of claim 2, there is proposed a work clearance measuring device characterized in that a clearance is formed between a compressor wheel and a shroud.

According to the above construction, since the size of the gap formed between the compressor wheel and the shroud is measured, the gap can be adjusted to an appropriate size to improve the performance of the compressor.

The compressor wheel 16 of the embodiment corresponds to the rotor of the present invention, the intermediate case 26 and the gas generator case 27 of the embodiment correspond to the casing of the present invention, and the centrifugal shroud 28 of the embodiment is It corresponds to the casing or shroud of the present invention, the annular flange 27a of the embodiment corresponds to the circular opening of the present invention, and the base member 51 and the center shaft 52 of the embodiment correspond to the work supporting means of the present invention. The XY table 57 and the swinging member 66 of the example correspond to the position adjusting means of the present invention, and the CCD camera 62 of the embodiment corresponds to the telecentric optical system camera of the present invention.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below based on the embodiments of the present invention shown in the accompanying drawings.

1 to 7 show an embodiment of the present invention. FIG. 1 is a view for explaining the overall structure of a turbofan engine, FIG. 2 is an overall side view of a measuring device, and FIG. 3 is for FIG. 3 direction arrow view, FIG. 4 is an enlarged view of part 4 of FIG. 2, and FIG. 5 is 5-5 of FIG.
FIG. 6 is a block diagram of a data processing system of the measuring device, and FIG. 7 is an explanatory diagram of the structure of a telecentric optical system CCD camera.

First, the overall structure of the turbofan engine will be described with reference to FIG. The turbofan engine includes an inner shaft 11 and an outer shaft 12 that is fitted to the outer periphery of the inner shaft 11 so as to be relatively rotatable. An axial fan 1 is provided at the front end of the inner shaft 11.
3 is provided, and an axial flow type first stage low pressure turbine wheel 14 and a second stage low pressure turbine wheel 15 are provided at the rear end. Further, a centrifugal compressor wheel 16 is provided at the front end of the outer shaft 12 shorter than the inner shaft 11, and an axial flow high-pressure turbine wheel 17 is provided at the rear end.

The fan 13 sucked in from the front of the engine
A part of the air compressed by the exhaust air is discharged from the rear part of the engine through the bypass passage 18 arranged along the outer periphery of the engine, and the remaining part of the air is compressed inside the bypass passage 18 in the radial direction. It is guided to the compressor wheel 16 via the air passage 19. The air further compressed by the compressor wheel 16 is supplied to the annular combustor 20, where it is mixed with the fuel injected from the fuel injection nozzle 21 and burned. The fuel gas generated in the combustor 20 includes a high pressure turbine wheel 17 provided at an upstream end of the combustion gas passage 22 and first and second stage low pressure turbine wheels 14 and 15 provided at an intermediate portion of the combustion gas passage 22. Is discharged from the rear part of the engine.

Next, the structure of the measuring device for measuring the maximum radius of the high-pressure turbine wheel 17 will be described with reference to FIGS.

The measuring device comprises a disk-shaped base member 51 and a center shaft 52 which stands upright in the center of the base member 51. The center shaft 52 is a model of the inner shaft 11 (see FIG. 1) of a turbofan engine. A hollow outer shaft 12 is fitted on the outer periphery of the center shaft 52, and the compressor wheel 16 and the hollow first outer shaft 12 are provided on the outer periphery of the outer shaft 12. The collar 23, the high-pressure turbine wheel 17, and the hollow second collar 24 are sequentially fitted. The compressor wheel 12, the first collar 23, the high pressure turbine wheel 17, and the second collar 24 are urged downward by urging the second collar 24 downward with the nut 53 that is screwed into the male screw portion 52a formed at the upper end of the center shaft 52. The curvic couplings (registered trademark) formed on the contact portions of the two are engaged with each other to automatically align the center. At this time, the lower end of the compressor wheel 16 is brought into contact with the step portion 12a formed on the outer periphery of the outer shaft 12 and positioned.

An intermediate case 26 which supports the outer shaft 12 via a ball bearing 25.
The lower end of is mounted on the upper surface of the base member 51 and is positioned by a plurality of knock pins 54 .... A roughly cylindrical gas generator case 27 is coupled to the outer peripheral portion of the upper end of the intermediate case 26, and a funnel-shaped centrifugal shroud 28 is coupled to the inner peripheral portion of the upper end of the intermediate case 26.

A fixed ring 55 is fixed to the upper surface of an annular flange 27a formed at the upper end of the gas generator case 27, and a movable ring 56 is slidably supported on the upper surface of the fixed ring 55 by inlay fitting. It The XY table 57 fixed to the upper surface of the movable ring 56 with the bolts 70 is the fixed table 5 fixed to the movable ring 56.
8 and an X-axis table 5 which can be moved relative to the fixed table 58 by an actuator (not shown) in the X-axis direction (direction toward and away from the axis L of the center shaft 52).
9 and an actuator (not shown) with respect to the X-axis table 59 in the Y-axis direction (direction of the axis L of the center shaft 52).
Is equipped with a Y-axis table 60 that can be moved relative to
A stay 61 fixed to the shaft table 60 extends downward inside the gas generator case 27, and a CCD camera 62 of a telecentric optical system is attached to the lower end of the stay 61 so that the angle can be adjusted.

That is, the bolts 63, 6 are attached to the lower end of the stay 61.
A rocking member 66 is pivotally supported by a bracket 64 fixed by 3 through a pin 65, and a bolt 67 penetrating the rocking member 66 has a length formed on the bracket 64 in an arc shape centered on the pin 65. The nut 80 is fastened through the hole 64a. The CCD camera 62 is supported by a support member 69 fixed to the lower end of the swing member 66 via bolts 68. The compressor wheel 16 is integrally provided with a plurality of compressor fins 16a, and the CCD camera 62 is arranged so as to direct a gap α between the compressor fins 16a and the centrifugal shroud 28.

As shown in FIG. 6, a CCD camera 62 is connected to an amplifier 72 fed from a 12V power source 71, and the CCD camera 62 is connected to a television display 74 via a visual scaler 73.

FIG. 7 shows a CCD of a telecentric optical system.
The structure of the camera 62 is shown. The optical system of the CCD camera 62 is such that a diaphragm 77 is arranged at a position of a focal point 76 of a lens 75, and even if a subject 78 moves vertically to the optical axis, C
It has the characteristic that the image connected to the CD 79 does not have a dimensional change or a position change, which is effective when performing image processing measurement. The output of the CCD camera 62 is amplified by the amplifier 72 and input to the visual scaler 73, where the subject 7
After the scale for displaying the 8 dimensions is set,
The enlarged image of the subject 78 and the corresponding scale are displayed on the television display 74. Therefore,
The size of the subject 78 can be known by comparing the image of the subject 78 on the television display 74 with the scale.

Next, the operation of the embodiment of the present invention having the above construction will be described.

As shown in FIG. 2, the outer shaft 12, the compressor wheel 16, and the turbofan engine outer shaft 12,
The first collar 23, the high-pressure turbine wheel 17, the second collar 24, the ball bearing 25, the intermediate case 26, the gas generator case 27, and the centrifugal shroud 28 are assembled as a subassembly, and the outer shaft 12 of the subassembly is assembled. With the intermediate case 26 placed on the base member 51 by being inserted through the center shaft 52, a nut 53 is screwed and fixed to the male screw portion 52a at the upper end of the center shaft 52. Subsequently, the fixed ring 55 is fixed to the annular flange 27a of the gas generator case 27, and the movable ring 56 is placed on the upper surface thereof.

In this state, X- provided on the movable ring 56
The CCD camera 62 supported on the lower end of the stay 61 hanging from the Y table 57 is attached to the gap α between the compressor wheel 16 and the centrifugal shroud 28 (see FIG. 4).
Position). That is, the XY table 5
7, the X-axis table 59 is moved in the X-axis direction, the Y-axis table 60 is moved in the Y-axis direction, and the swinging member 66 is swung around the pin 65. Then, the distance between the CCD camera 62 and the gap α is adjusted and focusing is performed.

As a result, as described above, since the image in which the gap α is enlarged and the scale corresponding to the enlargement ratio of the image are displayed on the television display 74, the image in the gap α is compared with the scale. The size of the gap α can be easily read. When the movable ring 56 is rotated 360 ° along the fixed ring 55, the CCD camera 62 is rotated 360 ° along the annular gap α.
The size of the gap α can be measured over the entire circumference.

If the outer peripheral portion of the centrifugal shroud 28 is not guaranteed to be a perfect circle and there is a possibility that the centrifuge shroud 28 is distorted in the direction of the axis L, the centrifugal shroud 28 is compressed by the compressor. Wheel 16
By repeating the measurement while rotating by a predetermined angle, it is possible to reliably measure the minimum value or the maximum value of the clearance α between the centrifugal shroud 28 and the compressor wheel 16.

As described above, since the CCD camera 62 is moved by using the gas generator case 27, which is a part of the casing of the turbofan engine, as a guide, the CCD camera 62 is moved.
The size of the gap α can be easily and precisely measured over the entire circumference without requiring a special guide member for guiding the movement of the camera 62. Moreover, since the CCD camera 62 of the telecentric optical system has a characteristic that the image size does not have an error even if the shooting distance changes, the accuracy of the measurement of the gap α is improved. Furthermore, since the position and angle of the CCD camera 62 can be arbitrarily adjusted by the XY table 57 and the swinging member 66, the measurement accuracy can be improved by correctly facing the gap α to be imaged.

Then, the compressor wheel 16 and the centrifugal shroud 2 of the turbofan engine
By measuring the size of the clearance α with the compressor 8, the clearance α can be adjusted to an appropriate size and the compressor wheel 16 can exhibit the maximum compression performance.

Although the embodiments of the present invention have been described in detail above, the present invention can be modified in various ways without departing from the scope of the invention.

For example, in the embodiment, the measurement of the clearance α between the compressor wheel 16 of the turbofan engine and the centrifugal shroud 28 is illustrated, but the present invention is applied to the measurement of the clearance between the casing of any workpiece and the rotor. be able to.

In the embodiment, the movable ring 56 is supported by the fixed ring 55 fixed to the centrifugal shroud 28, but the fixed ring 55 is omitted and the movable ring 56 is replaced by the centrifugal shroud 28 or another casing. May be directly supported by.

[0037]

As described above, according to the first aspect of the present invention, the circular opening of the casing is formed with the telecentric optical system camera facing the gap between the inner peripheral surface of the casing and the outer peripheral surface of the rotor. Since the part is moved as a guide, the size of the gap can be easily and accurately measured over the entire circumference without requiring a special guide member for guiding the movement of the telecentric optical system camera. Moreover, since the telecentric optical system camera is used, there is no error in the image size even if the shooting distance changes, and the accuracy of measuring the gap is further improved.

According to the invention described in claim 2,
Since the casing and the rotor are coaxially assembled and supported by the work supporting means, and the movable ring which is rotatably supported along the circular opening of the casing supports the telecentric optical system camera through the position adjusting means, it is movable. By rotating the ring, the telecentric optical system camera can be moved along the gap between the inner peripheral surface of the casing and the outer peripheral surface of the rotor, and the size of the gap can be easily and precisely measured over the entire circumference. it can. Further, since the telecentric optical system camera is moved by using the circular opening of the casing as a guide, a special guide member is not required, and the number of defectives can be reduced, and the position of the telecentric optical system camera can be adjusted by the position adjusting means. Since it can be adjusted via the, the telecentric optical system camera can be correctly opposed to the gap to improve the measurement accuracy. Further, by using the telecentric optical system camera, even if the shooting distance is changed, the error in the image size does not occur, and the measurement accuracy of the gap is further improved.

According to the invention described in claim 3,
Since the enlarged image of the gap taken by the telecentric optical system camera is displayed on the television display together with the scale, the state of the gap can be easily confirmed visually.

According to the invention described in claim 4,
Since the size of the gap formed between the compressor wheel and the shroud is measured, the gap can be adjusted to an appropriate size to enhance the performance of the compressor.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the overall structure of a turbofan engine.

FIG. 2 is an overall side view of the measuring device.

FIG. 3 is a three-direction arrow view of FIG.

FIG. 4 is an enlarged view of part 4 of FIG.

5 is a sectional view taken along line 5-5 of FIG.

FIG. 6 is a block diagram of a data processing system of the measuring device.

FIG. 7 is an explanatory diagram of a structure of a telecentric optical system CCD camera.

[Explanation of symbols]

16 Compressor Wheel (Rotor) 26 Intermediate Case (Casing) 27 Gas Generator Case (Casing) 27a Annular Flange (Opening) 28 Centrifugal Shroud (Casing, Shroud) 51 Base Member (Work Support Means) 52 Center Shaft (Work) Supporting means) 56 Movable ring 57 XY table (position adjusting means) 62 CCD camera (telecentric optical system camera) 66 Swing member (position adjusting means) 74 TV display α Gap

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takayuki Fusada             1-4-1 Chuo Stock Market, Wako City, Saitama Prefecture             Inside Honda Research Laboratory (72) Inventor Hidetaka Nagano             1-4-1 Chuo Stock Market, Wako City, Saitama Prefecture             Inside Honda Research Laboratory F term (reference) 2F065 AA21 CC00 DD06 FF04 JJ02                       JJ03 JJ25 JJ26 LL59 MM23                       PP11 QQ29 SS02 SS13

Claims (4)

[Claims] 1. A gap (α) between an inner peripheral surface of a casing (26, 27, 28) and an outer peripheral surface of a rotor (16) rotatably housed inside the casing (26, 27, 28). In the method for measuring the gap of the work for measuring the size of the whole circumference, the telecentric optical system camera (62) facing the gap (α) is attached to the circular opening (27a) of the casing (26, 27, 28). ) Is used as a guide to move and measure the size of the gap (α) over the entire circumference. 2. A gap (α) between the inner peripheral surface of the casing (26, 27, 28) and the outer peripheral surface of the rotor (16) rotatably housed inside the casing (26, 27, 28). In a work clearance measuring device for measuring the size of a workpiece over the entire circumference, a casing (26, 27, 28) and a rotor (16)
Workpiece support means (5 for supporting the workpiece in a state where it is assembled coaxially
1, 52) and the circular opening (27) of the casing (26, 27, 28).
Movable ring (56) rotatably supported along a)
And a telecentric optical system camera (62) supported on the movable ring (56) through position adjusting means (57, 66).
And a movable ring (56) with casings (26, 27, 28)
The device for measuring the gap of a work, characterized in that the size of the gap (α) is measured over the entire circumference by rotating the circular aperture (27a). 3. A telecentric optical camera (62)
A magnified image of the gap (α) imaged in (4) is displayed on a television display (74) together with a scale.
The gap measuring device for a work according to claim 2. 4. The compressor wheel (1) has a clearance (α).
The work clearance measuring device according to claim 2, wherein the device is formed between the shroud (6) and the shroud (28).