A device and method for measuring the installation angle of an aeroengine compressor stator blade

Abstract

The application relates to an aero-engine compressor stator blade installation angle measuring device and method, and belongs to the technical field of aero-engines. The device comprises a blade measuring assembly arranged at the front and rear edges of the blade and used for measuring the stator blades of each stage; a high-resolution probe assembly is driven by a driving mechanism to rotate above the blade measuring assembly, so that the image shooting of the front and rear edges of the whole stage blade and the blade measuring assembly can be quickly completed; an angle calculation assembly receives the image of the high-resolution probe assembly or performs image recognition and calculation to obtain the installation angles of each stage. During measurement, the distance between the blade front edge and the probe, the front edge scale of the whole stage blade, the rear edge scale of the whole stage blade, and the distance between the blade rear edge and the probe are measured in sequence, and the installation angles of the stator blades of each stage are calculated through the above data. The device and method provided by the application can quickly complete the angle measurement work, and the assembly efficiency of the stator blades is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of aero-engine, and particularly relates to an aero-engine compressor stator blade installation angle measuring device and method. BACKGROUND

[0002] The aero-engine compressor stator blade is mainly used for changing the air flow angle in the component, so that the air flow direction can meet the downstream demand. The ability of the compressor stator blade to change the air flow angle is mainly determined by the installation angle thereof. When the blade installation angle does not meet the demand, internal flow field disorder is easily caused, and then the compressor stability margin is reduced. Therefore, in the process of engine manufacturing and assembly, the blade installation angle needs to be strictly controlled. In actual manufacturing, the following two problems exist: ① For the adjustable stator blade with variable installation angle, a special tool is usually used to directly contact the front and rear edges of the blade to measure the installation angle. The measurement speed is slow, and the angle control precision is insufficient due to the influence of the manufacturing precision and measurement precision of the tool, so that the angle precision of direct measurement is insufficient; ② For the stator blade with constant installation angle, the blade installation angle is usually determined by the positioning tool during the welding process. Since the distance between the blades is narrow, the device cannot be directly measured, and the installation angle after welding is not measured. Therefore, the actual situation of the stator blade installation cannot be grasped.

[0003] Specifically, the existing blade measuring device is shown in Figure 1 . The device is fixed to the casing through the casing mounting edge hole, and then the device probe is stretched into the blade passage for measuring the blade installation angle. The measurement principle is shown in Figure 2 . Before the device probe enters the blade passage, zero operation is performed. The mechanical scale dial or electronic angle displacement sensor inside the device ensures zero. After the device probe is stretched into the blade passage, the device probe is rotated and simultaneously contacts the front and rear edges of the blade. The angle value is read from the mechanical scale dial or electronic angle displacement sensor, which is the blade installation angle. Then the device probe is retracted and stretched into other blade passages for measurement until all the measurements are completed. Obviously, the original blade measuring device has a complex measurement process, needs to be stretched in and retracted multiple times, and cannot be stretched into the measurement for the blade passage with large curvature. SUMMARY

[0004] In view of the deficiencies in the prior art, the present application provides an aero-engine compressor stator blade installation angle measuring device and method, which uses an indirect measurement method to accurately measure the blade installation angle and quickly complete the measurement of the entire stage of blades.

[0005] An aero-engine compressor stator blade installation angle measuring device comprises a blade measuring assembly arranged on the front and rear edges of the blade, and is used for measuring the stator blades of each stage.

[0006] A high-resolution probe assembly is driven by a driving mechanism to rotate above the vane measurement assembly to quickly complete the image shooting of the full-stage vane leading edge and trailing edge and the vane measurement assembly;

[0007] An angle calculation assembly receives the image of the high-resolution probe assembly or performs image recognition and calculation to obtain the installation angle of each stage.

[0008] The device base is also provided, and the vane measurement assembly is installed on the device base.

[0009] The high-resolution probe assembly and the angle calculation assembly are installed on the device upper tray, and the device upper tray is connected with the support column arranged at the center of the device base through a bearing.

[0010] The high-resolution probe assembly comprises a high-resolution camera for shooting the vane image and transmitting the shooting result to the angle calculation assembly.

[0011] The angle calculation assembly comprises an image recognition module for performing image recognition on the picture shot and transmitted by the high-resolution probe assembly, recognizing the leading edge scale and the trailing edge scale measured by the scale disc, and transmitting the recognized scale value to an angle calculation module; the angle calculation module receives the information from the image recognition module and obtains the installation angle of the stator vane through formula calculation and outputs.

[0012] The driving mechanism comprises a driving motor arranged on the support column, and the output end of the driving motor is connected with the device upper tray through a connecting rod to drive the rotation of the device upper tray.

[0013] The vane measurement assembly comprises two scale discs installed on the front and rear installation surfaces of the stator vane-containing to-be-detected casing assembly; and the device base is provided with a scale disc clamping groove for installing one of the scale discs.

[0014] The two scale discs are a first scale disc and a second scale disc arranged in an upper-lower manner and fixed in alignment with each other; and both the two scale discs are transparent scale discs and are marked with arc length scales on the radius circle.

[0015] An aviation engine compressor stator vane installation angle measurement method adopts the aviation engine compressor stator vane installation angle measurement device and specifically comprises the following steps:

[0016] S1: assembling the stator vane-containing to-be-detected casing assembly and installing one scale disc;

[0017] S2: measuring the distance between the vane leading edge and the probe:

[0018] The driving motor is started, the high-resolution probe assembly rotates to complete the photographing of the leading edges of the whole stage of blades, and the distance between the leading edges of the whole stage of blades and the probe is obtained through the angle calculation assembly;

[0019] S3: measuring the scale of the leading edges of the whole stage of blades:

[0020] Another scale is installed on the front mounting surface of the stator blade-containing casing assembly to be detected; the driving motor is started, the high-resolution probe assembly rotates to complete the photographing of the images of the stator blades of each stage and the first scale, and the scale measurement of the leading edges of the whole stage of blades is obtained through the angle calculation assembly;

[0021] S4: measuring the scale of the trailing edges of the whole stage of blades:

[0022] The stator blade-containing casing assembly to be detected is turned over, and the scale installed in step S1 is placed into the device base with the scale facing downward; the driving motor is started, the high-resolution probe rotates to complete the images of the stator blades of each stage and the second scale, and the scale measurement of the trailing edges of the whole stage of blades is obtained through the angle calculation assembly;

[0023] S5: measuring the distance between the trailing edges of the blades and the probe:

[0024] The scale installed in step S3 is removed from the rear mounting surface of the stator blade-containing casing assembly to be detected, the driving motor is started, the high-resolution probe assembly rotates to complete the photographing of the images of the stator blades of each stage, and the distance measurement between the trailing edges of the whole stage of blades and the probe is obtained through the angle calculation assembly;

[0025] S6: calculating the installation angles of the stator blades of each stage:

[0026] The angle calculation module calculates the installation angles of the stator blades of each stage through the data obtained in steps S3-S5.

[0027] The step S6 calculates the installation angles θ of the stator blades of each stage through an inverse tangent function:

[0028]

[0029] L1i is the distance between the leading edges of the blades of each stage and the probe;

[0030] S1i is the scale of the leading edges of the blades of each stage;

[0031] S2i is the scale of the trailing edges of the blades of each stage;

[0032] L2i is the distance between the trailing edges of the blades of each stage and the probe;

[0033] i=1, 2, 3,..., n; n is the number of stator blades in the stator blade-containing casing assembly to be detected;

[0034] After the installation angle θi of each stage stator blade is obtained by the above method, a fitting function relationship between θi and the blade installation angle measured by the method of the prior art is established, and θi is corrected through the fitting function relationship.

[0035] The beneficial effects of the present application are: the present application indirectly measures the arc length covered by the front and rear edges of the blade, calculates the installation angle of the stator blade, solves the problem of insufficient accuracy of direct angle measurement; the present application uses a high-resolution probe assembly that can rotate to continuously take pictures, and performs real-time image recognition and angle calculation by an angle calculation assembly, thereby quickly completing angle measurement and solving the problem of slow measurement speed.

[0036] Compared with direct angle measurement, arc length is easier to measure accurately, so the present device improves the measurement accuracy of the blade installation angle. The indirect measurement method can be used to measure stator blades with small spacing, solving the problem that existing devices cannot measure.

[0037] The device can quickly complete angle measurement, improving the assembly efficiency of the stator blade. Precise measurement and control of the stator blade installation angle can effectively solve the problems of insufficient performance and insufficient stability margin of the compressor component, improving the reliability of the engine. The blade installation angle measurement device can be widely applied to the assembly process of various aero-engine stator blades. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 It is a schematic diagram of the existing measurement device;

[0039] Figure 2 It is a measurement principle diagram of the existing measurement device;

[0040] Figures 1-2 In the middle:

[0041] 01-measurement device, 02-blade to be measured;

[0042] A-blade leading edge, B-blade trailing edge, C-device probe, S-blade to be measured, θ-blade installation angle;

[0043] Figure 3 It is a schematic diagram of the aero-engine compressor stator blade installation angle measurement device provided by the present application;

[0044] Figure 4 It is a measurement principle diagram of the present application;

[0045] Figures 3-4 In the middle:

[0046] 1 - device upper plate, 2 - drive motor, 3 - angle calculation assembly, 4 - high-resolution probe assembly, 5 - first dial, 6 - to be detected containing stator blade casing assembly, 7 - second dial, 8 - device base, 9 - stator blade, 10 - measurement assembly. DETAILED DESCRIPTION

[0047] In order to better explain the present application, in order to understand, the following specific embodiments, the technical scheme and effect of the present application are described in detail.

[0048] As Figure 3 shown, an aero-engine compressor stator blade installation angle measuring device, comprising a device base 8 and a device upper plate 1, the device upper plate 1 is connected with the support column arranged in the center of the device base 8 through the bearing. The device base 8 is provided with a blade measurement assembly for installing and measuring each stage stator blade 9. The device upper plate 1 is provided with an angle calculation assembly 3 and a high-resolution probe assembly 4 electrically connected thereto, and a driving mechanism fixed on the device upper plate 1 is driven to quickly complete the image shooting of the front and rear edges of the full stage stator blade 9 and the two dials.

[0049] The high-resolution probe assembly 4 includes a high-resolution camera and a laser range finder, which is used for image shooting and distance measurement of the stator blade 9 and transmits the shooting and measurement results to the angle calculation assembly 3.

[0050] The angle calculation assembly 3 includes an image recognition module and an angle calculation module, the image recognition module is used for image recognition of the pictures shot and transmitted by the high-resolution probe assembly 4, the front edge scale and the rear edge scale measured by the dial are recognized, and the recognized scale value is transmitted to the angle calculation module, the angle calculation module receives the information of the image recognition module, and the installation angle of the stator blade 9 is obtained through formula calculation, and the installation angle of the full stage stator blade 9 is output.

[0051] The driving mechanism includes a driving motor 2 arranged, the driving motor 2 is fixed on the support column, the output end of the driving motor 2 is connected with the device upper plate 1 through the connecting rod, and the rotation of the device upper plate 1 is driven by the driving motor 2.

[0052] The blade measurement assembly includes two dials, which are respectively installed on the front and rear mounting surfaces of the to-be-detected casing assembly 6 containing the stator blade, and are used for measuring the scales of the blade front edge and the blade rear edge. The device base 8 is provided with a dial clamping groove for installing one of the dials, and the dial is installed in the dial clamping groove.

[0053] Two said dials are respectively a first dial 5 and a second dial 7, arranged up and down, fixed to each other, and respectively installed to front and rear installation surfaces of the to-be-detected casing assembly 6 containing stator blades.

[0054] The measurement principle is shown in the drawings. Figure 4 The method for measuring the installation angle of the stator blade of the aircraft engine compressor by using the above-mentioned aircraft engine compressor stator blade installation angle measuring device is as follows:

[0055] S1: Assemble the to-be-detected casing assembly 6 containing stator blades and install dials:

[0056] After the assembly of the to-be-detected casing assembly 6 containing stator blades is completed, the second dial 7 is installed on the rear installation surface of the to-be-detected casing assembly 6 containing stator blades, and the second dial 7 is placed in the device base 8.

[0057] S2: Measure the distance between the blade leading edge and the measuring head:

[0058] Start the measurement program, start the driving motor 2, drive the high-resolution measuring head assembly 4 to rotate through the device upper supporting plate 1, and complete the photographing of the leading edge of the whole stage blade. During the rotation of the high-resolution measuring head assembly 4, the high-resolution camera photographs the images of each stage stator blade, the laser range finder measures the distance between the blade leading edge and the measuring head and numbers it as i (i = 1, 2, 3, …, n; wherein n is the number of stator blades 9 in the to-be-detected casing assembly 6 containing stator blades), and transmits the results to the angle calculation assembly 3. The image recognition module is used for image recognition of the pictures photographed and transmitted by the high-resolution measuring head assembly 4, the laser range finder measures the distance L1i (i = 1, 2, 3, …, n; wherein n is the number of stator blades 9 in the to-be-detected casing assembly 6 containing stator blades) between the leading edge of each stage blade and the measuring head, and transmits the results to the angle calculation module, so as to complete the measurement of the distance between the leading edge of the whole stage blade and the measuring head.

[0059] S3: Measure the whole stage blade leading edge scale:

[0060] S3: Measurement of the whole stage blade leading edge scale:

[0061] S4: Measurement of the whole stage blade trailing edge scale:

[0062] S4: Measurement of the whole stage blade trailing edge scale:

[0063] S5: Measurement of the distance between the blade trailing edge and the probe:

[0064] The second scale disc 7 is removed from the rear mounting surface of the stator blade-containing to-be-detected casing assembly 6. The measurement procedure is started, the driving motor 2 is started, the high-resolution probe assembly 4 is driven to rotate by the device upper plate 1, and the photographing of the rear edges of the whole stage of blades is completed. During the rotation of the high-resolution probe assembly 4, the high-resolution camera photographs the images of the stator blades, the laser range finder measures the distances between the blade leading edges and the probe and numbers them as i (i = 1, 2, 3, …, n; wherein n is the number of the stator blades 9 in the stator blade-containing to-be-detected casing assembly 6), and transmits the results to the angle calculation assembly 3. The image recognition module is used for image recognition of the pictures photographed and transmitted by the high-resolution probe assembly 4, the laser range finder measures the distances L2i (i = 1, 2, 3, …, n; wherein n is the number of the stator blades 9 in the stator blade-containing to-be-detected casing assembly 6) between the blade leading edges and the probe and transmits the results to the angle calculation module, so that the measurement of the distances between the rear edges of the whole stage of blades and the probe is completed.

[0065] S6: Calculate the installation angles of the stator blades of each stage:

[0066] The angle calculation module calculates the installation angles θi of the stator blades of each stage through formula (1) based on the data transmitted through steps S3-S5, and corrects them in combination with the test:

[0067]

[0068] Wherein, i = 1, 2, 3, …, n; n is the number of the stator blades 9 in the stator blade-containing to-be-detected casing assembly 6.

[0069] After the installation angles θi of the stator blades of each stage are obtained by using the above method, a fitting function relationship between θi and the blade installation angles measured by using the method of the prior art is established, θi is corrected through the fitting function relationship, so that the measurement precision and accuracy of the data obtained by using the method are improved, and the method is expanded to the assembly processes of other types of aero-engine stator blades.

Claims

1. A method for measuring the installation angle of a stator blade of an aircraft engine compressor, characterized by: A device for measuring the installation angle of a stator blade of an aircraft engine compressor is used, comprising a blade measuring assembly arranged at the leading and trailing edges of the blade, for measuring stator blades of various stages; A high-resolution probe assembly is driven by a drive mechanism to rotate above the blade measurement assembly to quickly capture images of the leading and trailing edges of all blades and the blade measurement assembly; the drive mechanism includes a drive motor; Angle calculation component, receiving images of high-resolution probe components or performing image recognition and calculation to obtain installation angles at all levels; Also included is a device base, on which the blade measurement assembly is mounted; The blade measurement assembly includes two scale plates, which are respectively mounted on the front and rear mounting surfaces of the casing assembly to be tested containing the stator blades; a scale plate clamping groove is provided on the base of the device for mounting one of the scale plates; The measurement method is as follows: S1: Assemble the casing assembly to be tested including the stator blades and install a dial; S2: Measure the distance between the leading edge of the blade and the probe: The drive motor starts, and the high-resolution probe assembly rotates to complete the picture of the leading edge of the entire blade stage, and the distance between the leading edge of the entire blade stage and the probe is obtained through the angle calculation assembly; S3: Measure the leading edge scale of the entire blade stage: Another scale plate is installed on the front mounting surface of the casing assembly to be inspected, which contains the stator blades. The drive motor is started, and the high-resolution probe assembly rotates to complete the image capture of each stage of the stator blades and the first scale plate, and the angle calculation assembly obtains the measurement of the leading edge scale of the entire stage of blades. S4: Measure the scale of the trailing edge of the entire blade: Turn the casing assembly to be inspected containing the stator blades around, and place the scale plate installed in step S1 downward into the base of the device; start the drive motor, and rotate the high-resolution probe to complete the image of each stage of stator blades and the second scale plate, and obtain the scale measurement of the trailing edge of the entire stage of blades through the angle calculation component; S5: Measure the distance between the trailing edge of the blade and the probe: Remove the scale plate installed in step S3 from the rear mounting surface of the casing assembly to be inspected, which contains the stator blades. Start the drive motor, and rotate the high-resolution probe assembly to complete the image capture of each stage of the stator blades. Use the angle calculation assembly to obtain the distance between the trailing edge of the entire stage of blades and the probe. S6: Calculate the installation angle of each level of stator blades: The angle calculation module calculates the installation angle of each level of stator blades through the data obtained in steps S3 to S5.

2. The method for measuring the installation angle of a stator blade of an aircraft engine compressor according to claim 1, characterized in that: The high-resolution probe assembly and the angle calculation assembly are mounted on an upper support plate of the device, and the upper support plate of the device is connected to a support column arranged at the center position of the device base through a bearing.

3. The method for measuring the installation angle of a stator blade of an aircraft engine compressor according to claim 1, characterized in that: The high-resolution probe assembly includes a high-resolution camera for capturing blade images and transmitting the capturing results to the angle calculation assembly.

4. The method for measuring the installation angle of a stator blade of an aircraft engine compressor according to claim 1, characterized in that: The angle calculation component includes an image recognition module, which is used to perform image recognition on the pictures taken and transmitted by the high-resolution probe component, identify the leading edge scale and trailing edge scale measured by the dial, and transmit the identified scale values ​​to the angle calculation module; the angle calculation module receives the information from the image recognition module, calculates the installation angle of the stator blade through a formula, and outputs it.

5. The method for measuring the installation angle of a stator blade of an aircraft engine compressor according to claim 2, characterized in that: The driving motor is fixed on the supporting column, and the output end of the driving motor is connected to the upper supporting plate of the device through a connecting rod, and the driving motor drives the rotation of the upper supporting plate of the device.

6. The method for measuring the installation angle of a stator blade of an aircraft engine compressor according to claim 1, characterized in that: The two scale plates are respectively the first scale plate and the second scale plate, which are arranged up and down and aligned and fixed with each other; the two scale plates are both transparent scale plates, and arc length scales are marked on the radius circle.

7. The method for measuring the installation angle of a stator blade of an aircraft engine compressor according to claim 1, characterized in that: The step S6 uses the arc tangent function to calculate the installation angle θ of each level of stator blades: , is the inverse tangent function (1) Among them, L1i is the distance between the leading edge of each level of blade and the probe; S1i is the scale of the leading edge of each level of blades; S2i is the scale of the trailing edge of each level of blades; L2i is the distance between the trailing edge of each level of blade and the measuring head; i=1, 2, 3, ..., n; n is the number of stator blades in the casing assembly to be tested containing stator blades; After obtaining the installation angle θi of each level of stator blades using the above method, a fitting function relationship between θi and the blade installation angle measured using the existing method is established, and θi is corrected using the fitting function relationship.

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