A turbine guide vane casting throat area detection device and method

Abstract

The present application provides a turbine guide vane casting throat area detection device and method, including: detection shell, size measurement assembly and area detector, detection shell includes bottom plate, fixed mounting plate and baffle, fixed mounting plate is equipped with size measurement assembly, size measurement assembly includes pulley block, measuring rope, telescopic arm and roller, pulley block is provided with measuring rope, one end of measuring rope is connected with detection mechanism, the other end of measuring rope is connected with one end of telescopic arm, the other end of telescopic arm is installed roller, and the roller is contacted with the area to be measured, and the coordinates of the roller are obtained by calculating the length of the measuring rope and telescopic arm, and then the area is calculated; the coordinates of the position point of the roller on the telescopic arm are calculated, a cylindrical coordinate system is constructed, the area is measured by a blade sample profile selection method to obtain the turbine guide vane casting throat area, the blade coordinate detection efficiency is greatly improved, and then the guide vane casting throat area is conveniently calculated.

Description

Technical Field

[0001] This invention belongs to the field of area detection technology, specifically relating to a device and method for detecting the throat area of ​​a turbine guide casting. Background Technology

[0002] The turbine section of an engine typically consists of multiple stages of blades. The turbine guide vane uses a curved structure to change the direction of gas flow, driving the rotating blades to rotate. The turbine guide vane has coaxial inner and outer rings, with multiple circumferentially spaced blades between them. The passage through which gas passes between adjacent blades is called the throat, and the narrowest distance between two adjacent blades is the throat width. The throat width is one of the most critical dimensions of the turbine guide vane, directly affecting the gas flow rate and thus the engine's efficiency or function.

[0003] Patent application CN112507489B discloses a method for calculating the throat area of ​​turbine guide vanes and guide vanes. The method involves establishing a cylindrical coordinate system, determining the theoretical width sample profile and the edge plate sample profile, and calculating the throat area of ​​the turbine guide vanes and guide vanes. However, in the prior art, the throat width of turbine guide vanes is generally measured using the three-coordinate method. However, the current three-coordinate method is complex and time-consuming, especially when each throat needs to be inspected, the time cost increases exponentially, which greatly affects the inspection efficiency. How to facilitate three-coordinate measurement is a technical problem that needs to be solved. Summary of the Invention

[0004] This invention addresses the problems of the prior art by providing a turbine guide casting throat area detection device, comprising: a detection housing, a size measurement component, and an area detector. The detection housing includes a base plate, a fixed mounting plate, and baffles. Two fixed mounting plates are provided on the front and rear sides of the upper surface of the base plate, and baffles are provided on the left and right sides of the upper surface of the base plate. The baffles are used to protect the internal structural components. The fixed mounting plate is equipped with a dimension measuring component, which includes a pulley block, a measuring rope, a telescopic arm and rollers. The measuring rope is set on the pulley block. One end of the measuring rope is connected to the detection mechanism, and the other end of the measuring rope is connected to one end of the telescopic arm. The other end of the telescopic arm is equipped with a roller. The roller contacts the area to be measured, and the coordinates are obtained by calculating the length of the measuring rope and the telescopic arm, and then the area is calculated. A detection mechanism is set above the baffle. The detection mechanism is connected to the base plate through a shock-absorbing rod. An area detector is set on the upper surface of the detection mechanism. The detection mechanism detects and measures the length of the rope and the length of the telescopic arm, and inputs the data into the area detector. The area detector calculates the coordinates of the position point of the roller on the telescopic arm, constructs a cylindrical coordinate system, and measures the area to obtain the throat area of ​​the turbine guide casting by selecting the blade sample profile.

[0005] Furthermore, the pulley assembly includes a first pulley and a second pulley. The first pulley is located below the second pulley and is a certain distance apart. The direction of the measuring rope is changed by the cooperation of the first pulley and the second pulley. The measuring rope is then connected to the telescopic arm after passing around the first pulley and the second pulley.

[0006] Furthermore, the telescopic arm includes a first arm, a telescopic shaft, and a second arm connected in sequence. The first arm is mounted on a hinge support and can rotate around the hinge support. The second arm is connected to the telescopic shaft, which can adjust the distance between the first arm and the second arm, thereby adjusting the overall length of the telescopic arm. A roller is installed at the end of the second telescopic arm, and the roller is in contact with the surface of the area to be measured.

[0007] Furthermore, the detection mechanism includes a roller with multiple receiving grooves on its surface for accommodating the measuring rope. An angle sensor is provided at at least one end of the roller, and the detection signal is transmitted to the area detector through the angle sensor to obtain the rotation angle of the roller, thereby obtaining the length of the measuring rope.

[0008] Secondly, the present invention also provides a method for operating the turbine guide vane casting throat area detection device as described in the first aspect, comprising: fixing the turbine guide vane casting throat area detection device in a set area of ​​the guide vane casting throat; specifically, the detection device can be inserted into the throat at a certain distance from the surface of the turbine guide vane by a fixing rod; contacting the area to be measured by a roller; obtaining coordinates by calculating the length of the measuring rope and the telescopic arm; detecting the length of the measuring rope and the telescopic arm by a detection mechanism and inputting them to an area detector; the area detector calculating the coordinates of the position point of the roller on the telescopic arm; constructing a cylindrical coordinate system; and measuring the area to obtain the turbine guide vane casting throat area by selecting the blade sample profile.

[0009] Compared with the prior art, the advantages and positive effects of the present invention are as follows: This invention employs a dimensional measurement assembly comprising a pulley system, a measuring rope, a telescopic arm, and rollers. The measuring rope is mounted on the pulley system, with one end connected to a detection mechanism and the other end connected to one end of the telescopic arm. A roller is mounted on the other end of the telescopic arm. The roller contacts the area to be measured, and coordinates are obtained by calculating the lengths of the measuring rope and the telescopic arm, thereby calculating the area. A cylindrical coordinate system is constructed by calculating the coordinates of the roller's position on the telescopic arm. The area is then measured using a blade sample profile selection method to obtain the throat area of ​​the turbine guide vane casting. The three-coordinate method used to measure the throat width of the turbine guide vane is simple, requiring only the movement of the roller along the blade to obtain the coordinates of the corresponding test point on the blade, greatly improving the efficiency of blade coordinate detection and facilitating the calculation of the throat area of ​​the guide vane casting. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the external structure of the turbine guide casting throat area detection device of the present invention. Figure 2 This is a schematic diagram of the internal structure of the turbine guide casting throat area detection device of the present invention. Figure 3 This is a schematic diagram of the telescopic arm of the present invention; Figure 4 This is a schematic diagram of the turbine guide casting throat area detection device of the present invention in use; In the above figures, 1-1 is the roller; 1-2 is the telescopic arm; 1-3 is the telescopic shaft; 1-4 is the hinge support; 1-5 is the fixed mounting plate; 1-6 is the measuring rope; 1-7 is the baffle; 1-8 is the area measuring device; 2-1 is the first pulley; 2-2 is the second pulley; 2-3 is the shock absorber; 2-4 is the detection mechanism; 3-1 is the rotation direction of the roller; 3-2 is the swing direction of the telescopic arm; 3-3 is the extension direction of the telescopic shaft; 3-4 is the rotation direction of the hinge support; and 3-5 is the sliding direction of the traction rope. α The vertical angle of the telescopic arm; H This is the distance between the second pulley and the base plate; S This refers to the distance between the base plate and the blade. l The lateral distance generated by the extension of the telescopic shaft; y This refers to the length of the telescopic arm; M This refers to the distance between the area measuring instrument and the blade. Detailed Implementation

[0012] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0013] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways than those described herein, and therefore the invention is not limited to the specific embodiments disclosed in the following specification.

[0014] Example 1, such as Figures 1-4As shown, this embodiment provides a device for detecting the throat area of ​​a turbine guide vane casting, including: a detection housing, a dimension measuring component, and an area measuring device 1-8. The detection housing includes a base plate, a fixed mounting plate 1-5, and baffles 1-7. Two fixed mounting plates 1-5 are provided on the front and rear sides of the upper surface of the base plate, and baffles 1-7 are provided on the left and right sides of the upper surface of the base plate. The baffles 1-7 are used to protect the internal structural components. The dimension measuring component is provided on the fixed mounting plate 1-5. The dimension measuring component includes a pulley system, a measuring rope 1-6, a telescopic arm 1-2, and rollers 1-1. The measuring rope 1-6 is provided on the pulley system. One end of the measuring rope 1-6 is connected to the detection mechanism 2-4, and the other end of the measuring rope 1-6 is connected to one end of the telescopic arm 1-2. A roller 1-1 is installed at the other end of the telescopic arm 1-2. The roller 1-1 contacts the area to be measured. The coordinates are obtained by calculating the length of the measuring rope 1-6 and the telescopic arm 1-2, and then the area is calculated. A detection mechanism 2-4 is set above the baffle 1-7. The detection mechanism 2-4 is connected to the base plate through the shock absorber 2-3. An area measuring device 1-8 is set on the upper surface of the detection mechanism 2-4. The detection mechanism 2-4 detects the length of the measuring rope 1-6 and the length of the telescopic arm 1-2 and inputs it to the area measuring device 1-8. The area measuring device 1-8 calculates the coordinates of the position point of the roller 1-1 on the telescopic arm 1-2, constructs a cylindrical coordinate system, and measures the area to obtain the throat area of ​​the turbine guide casting by selecting the blade sample profile.

[0015] The pulley group includes a first pulley 2-1 and a second pulley 2-2. The first pulley 2-1 is located below the second pulley 2-2 and is a certain distance apart. The direction of the measuring rope 1-6 is changed by the cooperation of the first pulley 2-1 and the second pulley 2-2. The measuring rope 1-6 is connected to the telescopic arm 1-2 after passing around the first pulley 2-1 and the second pulley 2-2.

[0016] The telescopic arm 1-2 includes a first arm, a telescopic shaft 1-3, and a second arm connected in sequence. The first arm is mounted on a hinge support 1-4 and can rotate around the hinge support 1-4. The second arm is connected to the telescopic shaft 1-3. The telescopic shaft 1-3 can adjust the distance between the first arm and the second arm, thereby adjusting the overall length of the telescopic arm 1-2. A roller 1-1 is installed at the end of the second arm, and the roller 1-1 is in contact with the surface of the area to be measured.

[0017] The detection mechanism 2-4 includes a roller with multiple receiving grooves on its surface for accommodating measuring ropes 1-6. An angle sensor is provided at at least one end of the roller, and the angle sensor transmits the detection signal to the area measuring device 1-8 to obtain the rotation angle of the roller, thereby obtaining the length of the measuring rope 1-6. The length of one measuring rope 1-6 corresponds to one telescopic arm angle. The angle of the telescopic arm 1-2 can be obtained using the length of the measuring rope 1-6. The horizontal coordinate n and vertical coordinate u of the roller 1-1 can be obtained by calculating the angle and length of the telescopic arm 1-2. Since the vertical coordinate g is fixed by the device position, the three-dimensional coordinate p(n, g, u) at the measurement point can be obtained. A cylindrical coordinate system is constructed using the measurement point.

[0018] like Figure 3 , Figure 4 As shown in the figure, the rotation direction of roller 1-1; the swing direction of telescopic arm 1-2; the extension direction of telescopic shaft 1-3; the rotation direction of hinge support 1-4; the sliding direction of traction rope; and the movement direction of shock absorber 2-3 are shown.

[0019] Where y*cosα is the horizontal length and y*sinα is the vertical length, the horizontal coordinate n and the vertical coordinate u can be obtained by establishing a cylindrical coordinate system. α The included vertical angle between the telescopic boom 1 and 2; y The telescopic arm is 1-2 times its length.

[0020] The area measuring devices 1-8 represent the coordinates of any point on the turbine guide vane or guide vane using p(n, g, u). They create width segments and width feature points based on the width profile, characterize the window width profile using the intersection of cylindrical sections with the outer surface of the blade at different r values, and determine the number k and its distribution based on the radial airfoil distribution of the blade. They scan the width sample profiles and flange sample profiles of each window in the actual turbine guide vane or guide vane coordinate system using a three-coordinate scanning system, delete the coordinate points of concave shape sample profiles such as film canopies and tail slots, extend the flange sample profiles, interpolate the width sample profiles and flange sample profiles, transform the flange sample profile coordinate points into a cylindrical coordinate system, and rotate them around the h-axis to form the flange flow channel surface. Finally, they calculate the throat area of ​​the actual window, turbine guide vane, and guide vane. The calculation formulas are existing technologies, and the background technology provides relevant information, so they will not be elaborated further.

[0021] First, the turbine guide vane casting throat area detection device is fixedly installed in the throat area of ​​the guide vane casting. For example, the detection device can be inserted into the throat at a certain distance from the surface of the turbine guide vane by a fixing rod, and the vane is measured to obtain the three-dimensional coordinate points of the vane.

[0022] Example 2 provides a working method for a turbine guide vane casting throat area detection device, comprising: fixing the turbine guide vane casting throat area detection device in a set area of ​​the guide vane casting throat; specifically, the detection device can be inserted into the throat at a certain distance from the surface of the turbine guide vane by a fixing rod; the device contacts the area to be measured by roller 1-1; the coordinates are obtained by calculating the length of the measuring rope 1-6 and the telescopic arm 1-2; the detection mechanism 2-4 detects the length of the measuring rope 1-6 and the telescopic arm 1-2 and inputs them to the area measuring device 1-8; the area measuring device 1-8 calculates the coordinates of the position point of roller 1-1 on the telescopic arm 1-2, constructs a cylindrical coordinate system, and obtains the area of ​​the turbine guide vane casting throat by measuring the area using the blade sample profile selection method.

[0023] The blade sample profile selection method includes: using p(n, g, u) to represent the coordinates of any point on the turbine guide blade or guide, creating width segments and width feature points based on the width profile, characterizing the window width profile using the intersection of the cylindrical cross-section with the blade outer surface under different r values, determining the number k of width profile groups and their distribution based on the blade's radial airfoil distribution, scanning the width sample profiles and rim sample profiles of each window in the actual turbine guide blade or guide coordinate system using a three-coordinate scanner, deleting the coordinate points of the sample profiles at concave shapes such as film cooling holes and tail slots, extending the rim sample profiles, interpolating the width sample profiles and rim sample profiles, converting the rim sample profile coordinate points into a cylindrical coordinate system and rotating them around the h-axis to form the rim flow channel surface, and then calculating the throat area of ​​the actual window, turbine guide blade, and guide.

[0024] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments that can be applied to other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A device for detecting the throat area of ​​a turbine guide vane casting, characterized in that, include: The system includes a housing, a size measurement component, and an area detector. The housing consists of a base plate, a mounting plate, and baffles. Two mounting plates are installed on the front and rear sides of the upper surface of the base plate, and baffles are installed on the left and right sides of the upper surface of the base plate. The baffles are used to protect the internal structural components. The fixed mounting plate is equipped with a dimension measuring component, which includes a pulley block, a measuring rope, a telescopic arm and rollers. The measuring rope is set on the pulley block. One end of the measuring rope is connected to the detection mechanism, and the other end of the measuring rope is connected to one end of the telescopic arm. The other end of the telescopic arm is equipped with a roller. The roller contacts the area to be measured, and the coordinates are obtained by calculating the length of the measuring rope and the telescopic arm, and then the area is calculated. A detection mechanism is set above the baffle. The detection mechanism is connected to the base plate through a shock-absorbing rod. An area detector is set on the upper surface of the detection mechanism. The detection mechanism detects and measures the length of the rope and the length of the telescopic arm, and inputs the data into the area detector. The area detector calculates the coordinates of the position point of the roller on the telescopic arm, constructs a cylindrical coordinate system, and measures the area to obtain the throat area of ​​the turbine guide casting by selecting the blade sample profile.

2. The turbine guide vane casting throat area detection device according to claim 1, characterized in that, The pulley assembly includes a first pulley and a second pulley. The first pulley is located below the second pulley and is a certain distance apart. The direction of the measuring rope is changed by the cooperation of the first pulley and the second pulley. The measuring rope is connected to the telescopic arm after passing around the first pulley and the second pulley.

3. The turbine guide vane casting throat area detection device according to claim 1, characterized in that, The telescopic arm includes a first arm, a telescopic shaft, and a second arm connected in sequence. The first arm is mounted on a hinge support and can rotate around the hinge support. The second arm is connected to the telescopic shaft, which can adjust the distance between the first arm and the second arm, thereby adjusting the overall length of the telescopic arm. A roller is installed at the end of the second telescopic arm, and the roller is in contact with the surface of the area to be measured.

4. The turbine guide vane casting throat area detection device according to claim 1, characterized in that, The detection mechanism includes a roller with multiple receiving grooves on its surface for accommodating the measuring rope. An angle sensor is provided at at least one end of the roller. The angle sensor transmits the detection signal to the area detector to obtain the rotation angle of the roller, thereby obtaining the length of the measuring rope.

5. A method for operating the turbine guide vane casting throat area detection device as described in any one of claims 1-4, characterized in that, include: The turbine guide vane casting throat area detection device is fixedly installed in the designated area of ​​the guide vane casting throat. Specifically, the detection device can be inserted into the throat at a certain distance from the surface of the turbine guide vane through a fixing rod. The roller contacts the area to be measured, and the coordinates are obtained by calculating the length of the measuring rope and the telescopic arm. The detection mechanism detects the length of the measuring rope and the telescopic arm and inputs them to the area detector. The area detector calculates the coordinates of the position point of the roller on the telescopic arm, constructs a cylindrical coordinate system, and measures the area to obtain the throat area of ​​the turbine guide vane casting by selecting the blade sample profile.

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