A positioning mechanism for opening holes in the wall of an annular casing

Abstract

The present invention relates to a positioning mechanism for opening holes in the wall of an annular casing, mainly including a support, an axial slide rail, an axial slider, a circumferential guide rail support, a circumferential guide rail, a circumferential slider, a radial connecting rod, a radial guide rail, a radial slider, a drill chuck seat, a drill chuck, an axial positioning scale, and a circumferential positioning scale. The support is located outside the annular casing, and the drill chuck seat and the drill chuck are located inside the annular casing. The drill chuck seat and the drill chuck achieve three-dimensional movement. The positioning mechanism of the present invention can open holes at any position on the wall of the annular casing when only one end of the casing is disassembled, and the whole process is low-cost, fast, and high-precision. It is applicable to the casing hole opening of other turbomachines except for contra-rotating compressors, such as ventilators and compressors.

Description

Technical Field

[0001] The present invention belongs to the technical field of compressor measurement and processing auxiliary equipment, and specifically relates to a positioning mechanism for opening holes on the wall of an annular casing. Background Art

[0002] Since the birth of jet engines, nearly 80 years have passed. As one of the three core components of a jet engine (the other two being the combustion chamber and the turbine), the stability of the compressor has always been a research hotspot. Stall and surge, as the main unstable flow forms inside the compressor, usually cannot obtain effective results through theoretical calculations. Therefore, experimental measurement methods are generally used at present to study the flow instability phenomenon inside the compressor. Professors Day at the University of Cambridge and Cumpsty at the Imperial College London were the first to use hot wires and pressure sensors to obtain detailed parameters of the internal flow under unstable conditions of an axial compressor. The layout form of sensors on the compressor casing plays an important role in the experimental process. Usually, holes need to be opened on the casing for installing sensors. By changing the sensor layout form, more abundant internal flow field information of the compressor can be monitored, and different sensor layout forms correspond to different casing hole positions. In order to achieve different sensor layouts, various casings generally need to be designed and machined.

[0003] In practice, once the compressor test bench is built, changing the sensor layout means replacing the casing with a new one, and this method has obvious drawbacks. On the one hand, it requires a large amount of financial resources and time, affecting the experimental progress. On the other hand, there are slight geometric and positioning differences between compressors casings processed and installed in different batches, which may be extremely sensitive to unstable flow. Slight dimensional differences will cause fundamental changes in the flow form. Therefore, the experimental results corresponding to two casings processed or installed in different batches are not comparable. The Whittle Laboratory at the University of Cambridge realized the above problems and made some improvements to the experimental scheme, but still could not fundamentally solve them. As a new pneumatic layout form with broad application prospects, this problem is particularly important for contra-rotating (rotor-rotor) compressors. Summary of the Invention

[0004] In order to overcome the deficiencies in the current compressor measurement experiment, where opening holes for installing sensors on the casing requires multiple disassembly or reprocessing of the compressor casing, resulting in cumbersome experimental steps and increased experimental errors, the present invention proposes a positioning mechanism for opening holes on the wall of an annular casing.

[0005] The technical solution adopted by the present invention to solve its technical problems is:

[0006] A positioning mechanism for opening holes in the wall of an annular casing, comprising a support, an axial slide rail, an axial slider, a circumferential guide rail support, a circumferential guide rail, a circumferential slider, a radial connecting rod, a radial guide rail, a radial slider, a drill chuck holder, and a drill chuck.

[0007] The axial slide rail is fixedly connected to the support. The axial slider is matched with the axial slide rail and is installed on the axial slide rail.

[0008] The circumferential guide rail support is fixedly connected to the axial slider. The circumferential guide rail is arc-shaped, and the center of the arc is located on the center line of the annular casing. The circumferential guide rail is installed on the circumferential guide rail support and is fixedly connected to the circumferential guide rail support. The circumferential slider is installed on the circumferential guide rail, is matched with the circumferential guide rail, and can move along the circumferential guide rail.

[0009] The radial connecting rod is fixedly connected to the circumferential slider and the radial guide rail. The radial connecting rod is L-shaped, so that the support of the positioning mechanism is located outside the annular casing, and the drill chuck is located inside the annular casing. The radial slider is installed on the radial guide rail, is matched with the radial guide rail, and can move along the radial guide rail.

[0010] The drill chuck holder is fixedly connected to the radial slider and is installed on the radial slider. The drill chuck is fixedly connected to the drill chuck holder and is used for clamping a drill. The drill chuck holder and the drill chuck are located inside the annular casing.

[0011] For the above-mentioned positioning mechanism, the support, the circumferential guide rail support, the radial connecting rod, the drill chuck holder, and the drill chuck are all prepared by 3D printing technology.

[0012] The above-mentioned positioning mechanism further includes an axial positioning scale and a circumferential positioning scale.

[0013] The axial positioning scale is a graduated straight ruler, which is installed along the axial direction of the annular casing and is installed inside the annular casing.

[0014] The circumferential positioning scale is a graduated arc-shaped scale, which is installed along the circumferential direction of the annular casing and is installed inside the annular casing.

[0015] The axial positioning scale is perpendicular to the circumferential positioning scale.

[0016] The beneficial effects of the present invention are:

[0017] A positioning mechanism for opening holes in the wall of an annular casing can open holes at any position on the wall of the annular casing by only disassembling one end of the casing, and the whole process is low-cost, fast and high-precision. Thus, different sensor layout forms can be realized, and each layout form has a comparable meaning, providing technical guarantee for further studying the refined structure of the internal flow of a contra-rotating compressor. It should be noted that the present invention is also applicable to the casing opening schemes of other turbomachines except the contra-rotating compressor, such as ventilators and compressors. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the drawings and embodiments.

[0019] Figure 1 Front view of the positioning mechanism of the present invention;

[0020] Figure 2 Left view of the positioning mechanism of the present invention;

[0021] Figure 3 Stereogram of the positioning mechanism of the present invention;

[0022] Figure 4 Front view of the positioning mechanism of the present invention installed on the annular casing; an electric drill is included in the figure;

[0023] Figure 5 Left view of the positioning mechanism of the present invention installed on the annular casing; an electric drill is included in the figure;

[0024] Figure 6 Stereogram of the positioning mechanism of the present invention installed on the annular casing; an electric drill is included in the figure;

[0025] Figure 7 is Figure 6 rear stereogram of;

[0026] Figure 8 Stereogram of the positioning mechanism of the present invention used for a certain type of contra-rotating compressor.

[0027] In the figure: 1. support; 2. axial slide rail; 3. axial slide block; 4. circumferential guide rail support; 5. circumferential guide rail; 6. circumferential slide block; 7. radial connecting rod; 8. radial guide rail; 9. radial slide block; 10. electric drill chuck base; 11. electric drill chuck; 12. axial positioning scale; 13. circumferential positioning scale. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] Embodiment 1

[0029] A positioning mechanism for opening holes in the wall of an annular casing mainly includes a support 1, an axial slide rail 2, an axial slide block 3, a circumferential guide rail support 4, a circumferential guide rail 5, a circumferential slide block 6, a radial connecting rod 7, a radial guide rail 8, a radial slide block 9, an electric drill chuck base 10, and an electric drill chuck 11, as Figure 1 ,Figure 2 , Figure 3 as shown.

[0030] As Figure 1 , Figure 2 , Figure 3 shown, the support 1 is installed on the outer side of the annular casing, matching the outer side of the annular casing, and is connected to the casing flange of the annular casing by bolts. It is the support of the positioning mechanism of the present invention. The connection between the support 1 and the outer side of the annular casing is arc-shaped.

[0031] The axial slide rail 2 is fixedly connected to the support 1 and is installed on the support 1.

[0032] The axial slide block 3 is installed on the axial slide rail 2. The axial slide block 3 matches the axial slide rail 2, and the axial slide block 3 can move along the axial slide rail 2. The axial slide rail 2 restricts the movement of the axial slide block 3, that is, the axial slide block 3 can translate along the axis of the compressor.

[0033] The circumferential guide rail support 4 is fixedly connected to the axial slide block 3.

[0034] The circumferential guide rail 5 is installed on the circumferential guide rail support 4 and is fixedly connected to the circumferential guide rail support 4.

[0035] The circumferential guide rail 5 is arc-shaped, and the center of the arc is located on the center line of the annular casing, that is, on the axis of the compressor.

[0036] The circumferential slide block 6 is installed on the circumferential guide rail 5. The circumferential slide block 6 matches the circumferential guide rail 5 and can move along the circumferential guide rail 5, that is, it can move circumferentially along the compressor. The circumferential guide rail 5 plays a role in restricting the circumferential movement of the circumferential slide block 6.

[0037] The radial connecting rod 7 is fixedly connected to the circumferential arc slide block 6 and the radial guide rail 8, playing a role in connecting components.

[0038] The radial connecting rod 7 is L-shaped, which can make the support 1 of the positioning mechanism located on the outer side of the annular casing and the drill chuck 11 located on the inner side of the annular casing.

[0039] The radial slide block 9 is installed on the radial guide rail 8. The radial slide block 9 matches the radial guide rail 8 and can move along the radial guide rail 8, that is, it can translate radially along the annular casing.

[0040] The drill chuck seat 10 is fixedly connected to the radial slide block 9 and is installed on the radial slide block 9.

[0041] The drill chuck 11 is fixedly connected to the drill chuck seat 10 and is used for clamping the drill.

[0042] The drill chuck seat 10 and the drill chuck 11 are located on the inner side of the annular casing.

[0043] The support 1, the circumferential guide rail support 4, the radial connecting rod 7, the electric drill chuck seat 10, and the electric drill chuck 11 can all be prepared by 3D printing technology. Therefore, the positioning mechanism of the present invention has low preparation cost, short cycle, and high component size accuracy.

[0044] Embodiment 2

[0045] The positioning mechanism may further include an axial positioning scale 12 and a circumferential positioning scale 13.

[0046] The circumferential positioning scale 13 is perpendicular to the axial positioning scale 12.

[0047] The axial positioning scale 12 is a graduated straight ruler, which is installed along the axial direction of the annular casing and on the inner side of the annular casing. Corresponding to the preset axial position of the positioning, the axial positioning scale 12 is set, and the accurate axial positioning of the positioning mechanism can be achieved.

[0048] The circumferential positioning scale 13 is a graduated arc-shaped scale, which is installed along the circumferential direction of the annular casing and on the inner side of the annular casing. By setting the circumferential positioning scale 13, the accurate circumferential positioning of the positioning mechanism can be achieved.

[0049] By using the axial positioning scale and the circumferential positioning scale in combination, the accurate positioning of the inner surface of the compressor annular casing can be achieved.

[0050] The process of using the positioning mechanism of the present invention to position the opening on the wall surface of the annular casing of the contra-rotating compressor is as follows:

[0051] Disassemble one side of a part of the annular casing of the contra-rotating compressor to reserve space for the operator to install and operate the positioning mechanism;

[0052] Install the positioning mechanism on the flange of the annular casing of the contra-rotating compressor;

[0053] Install the electric drill on the electric drill chuck 11 of the positioning mechanism;

[0054] Install the axial positioning scale 12 and the circumferential positioning scale 13 near the position of the pre-drilled hole, and connect the axial positioning scale 12 and the circumferential positioning scale 13 to one side flange with bolts;

[0055] Adjust the positions of the axial slider 3, the circumferential slider 6, and the radial slider 9, and use the axial positioning scale 12 and the circumferential positioning scale 13 to position the opening position;

[0056] Operate the electric drill to make an opening;

[0057] Repeat the above operations to achieve the positioning of all predetermined opening positions.

Claims

1. A positioning mechanism for opening holes in the wall of an annular casing, characterized in that It mainly includes a support (1), an axial slide rail (2), an axial slider (3), a circumferential guide rail support (4), a circumferential guide rail (5), a circumferential slider (6), a radial connecting rod (7), a radial guide rail (8), a radial slider (9), a drill chuck seat (10), and a drill chuck (11); the axial slide rail (2) is fixedly connected to the support (1); the axial slider (3) is matched with the axial slide rail (2) and is installed on the axial slide rail (2); the circumferential guide rail support (4) is fixedly connected to the axial slider (3); the circumferential guide rail (5) is arc-shaped, and the center of the arc is located on the center line of the annular casing. The circumferential guide rail (5) is installed on the circumferential guide rail support (4) and is fixedly connected to the circumferential guide rail support (4); the circumferential slider (6) is installed on the circumferential guide rail (5), is matched with the circumferential guide rail (5), and can move along the circumferential guide rail (5); the radial connecting rod (7) is fixedly connected to the circumferential slider (6) and the radial guide rail (8). The radial connecting rod (7) is L-shaped, so that the support (1) of the positioning mechanism is located outside the annular casing, and the drill chuck (11) is located inside the annular casing; the radial slider (9) is installed on the radial guide rail (8), is matched with the radial guide rail (8), and can move along the radial guide rail (8); the drill chuck seat (10) is fixedly connected to the radial slider (9) and is installed on the radial slider (9); the drill chuck (11) is fixedly connected to the drill chuck seat (10) and is used for clamping a drill; the drill chuck seat (10) and the drill chuck (11) are located inside the annular casing; the positioning mechanism further includes an axial positioning scale (12) and a circumferential positioning scale (13); the axial positioning scale (12) is a graduated straight ruler, is installed along the axial direction of the annular casing, and is installed inside the annular casing; the circumferential positioning scale (13) is a graduated arc-shaped scale, is installed along the circumferential direction of the annular casing, and is installed inside the annular casing; the axial positioning scale (12) is perpendicular to the circumferential positioning scale (13); The support (1) is installed between the flange plates at both ends outside the annular casing, is matched with the outside of the annular casing, and is connected to the flange plates of the annular casing by bolts. The connection between the support (1) and the outside of the annular casing is arc-shaped.

2. The positioning mechanism for opening holes in the wall of an annular casing according to claim 1, wherein, The support (1), the circumferential guide rail support (4), the radial connecting rod (7), the drill chuck seat (10), and the drill chuck (11) are all prepared by 3D printing technology.

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