Vibration measurement device for high temperature wind tunnels with strong impact and strong electromagnetic interference

Abstract

The present invention belongs to the technical field of wind tunnel tests, and discloses a vibration measuring device for use in high-temperature wind tunnels under strong impact and strong electromagnetic interference environments. The vibration measuring device is connected by insulating assembly using special-shaped bolts, PVC sleeves and gaskets, sensor mounting seats, circular gaskets, base adapter blocks, etc., and the base adapter blocks are fixed to the outer wall of the device under test by welding. The multi-layer sub-structure threaded connection form used by the special-shaped bolts, PVC sleeves and gaskets can effectively isolate electromagnetic interference, and the multi-directional threaded connection method of the sensor mounting seat and the base adapter block can ensure that the vibration sensor is firmly fixed on the outer wall of the device under test for a long time under strong impact environments. The combination of the two methods can ensure the safety and data reliability of various high-temperature tests and long-term hot tests in high-temperature wind tunnels.

Description

Technical Field

[0001] The invention belongs to the technical field of high-temperature wind tunnel test equipment, and in particular relates to a vibration measuring device used in a high-temperature wind tunnel under strong impact and strong electromagnetic interference environments. Background Art

[0002] In high-temperature wind tunnel tests, the reliable operation of equipment is directly related to the quality of the entire high-temperature wind tunnel test mission. For example, during the operation of the core subsystem combustion heater, due to the harsh working conditions of high temperature, high pressure, strong vibration, etc., key components are prone to failures such as deflagration, overshoot, and structural fracture. If the failure is not detected in time, it is easy to cause safety accidents, which may cause damage to the equipment structure at the least, or endanger the lives of the staff at the worst. Therefore, the status monitoring and health diagnosis of each system equipment of the high-temperature wind tunnel plays an extremely important role in evaluating its working status, change trend, life status, and even the safety and reliability of the entire high-temperature wind tunnel operation.

[0003] Due to the fast response and high sensitivity of vibration signals, vibration sensors are widely used in equipment fault monitoring and diagnosis. In the actual test process, multiple systems of the high-temperature wind tunnel run synchronously, the on-site test environment is complex, and there is strong electromagnetic interference. The test measurement found that if the vibration sensor does not take insulation measures, the obtained vibration data will have low-frequency interference, large signal noise, and the low-frequency signal is superimposed on the characteristic frequency of the equipment, resulting in the inability to accurately and effectively identify the characteristic frequency of the equipment operation, which greatly affects the equipment status monitoring and health diagnosis.

[0004] At present, the common installation methods of vibration sensors include magnetic suction, threading, and pasting. In high-temperature wind tunnel tests, the equipment has a large transient impact, the magnetic suction method has weak stability, and the vibration sensor is easy to loosen, fall off, and be damaged. The sensor is usually fixed by threaded installation. However, since the high-temperature wind tunnel body is conductive and there is strong electromagnetic interference, ordinary threaded connections will inevitably make the vibration sensor affected by electromagnetic interference. Long-term use will not only fail to obtain high-precision effective data, but also easily damage the vibration sensor. In addition, the high-temperature wind tunnel has a large operating flow, high temperature and high pressure in the combustion chamber, and unstable combustion often occurs during equipment debugging. The vibration impact is large and the acceleration can reach more than 1000G. Although the traditional pasting installation method can be insulated, the sensor will become loose and fly out during the test. Not only can effective data not be obtained, but the normal operation of the high-temperature wind tunnel will also be affected. Therefore, the traditional sensor installation method can no longer adapt to the operating environment of the high-temperature wind tunnel.

[0005] In order to accurately obtain equipment vibration data under high temperature, high pressure, strong impact, and strong electromagnetic interference environments, it is currently urgent to develop a vibration measurement device for high temperature wind tunnels with strong impact and strong electromagnetic interference environments. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a vibration measuring device for use in a high-temperature wind tunnel under strong impact and strong electromagnetic interference environments, so as to overcome the defects of the prior art.

[0007] The vibration measuring device for high temperature wind tunnel under strong impact and strong electromagnetic interference environment of the present invention realizes the insulation assembly of vibration sensor by designing special-shaped bolts and PVC gaskets and the specific assembly form of sleeves and special-shaped bolts, which effectively solves the electromagnetic interference. The whole measuring device includes special-shaped bolts, PVC sleeves and gaskets, sensor mounting seat, circular gaskets and base adapter blocks, etc. Among them, the special-shaped bolt can be divided into three parts from bottom to top: the bottom end is connected with the base mounting block through a threaded hole with a diameter of M5; the middle part is thinner than the upper end and the bottom end, with a diameter of M4, covered with a layer of PVC sleeve and passed through the sensor mounting seat, and a PVC gasket with a thickness of about 1mm is installed between the base mounting block and the sensor mounting seat; the upper end of the bolt is a threaded rod with a diameter of M5, and a layer of circular PVC gasket is added between the upper end of the bolt and the sensor mounting seat. The sleeve height of the middle part of the special-shaped bolt is required to be slightly higher than the sensor mounting seat, and the special-shaped bolt body shall not directly contact the sensor mounting seat, thereby realizing the insulation installation of the vibration sensor. In addition, the entire measuring device also uses multi-directional threaded connections. Specifically, the measuring device contains four special-shaped bolts, which are distributed at the four corners of the sensor mounting base. This ensures that the measuring device does not shake and the sensor does not loosen under strong impact, and the measurement data truly responds to the vibration characteristics of the measured object. The vibration sensor is installed in the center of the sensor mounting base using M5 threads, and the wind tunnel measured device and the base adapter block are connected by welding.

[0008] The detailed technical scheme of the vibration measurement device for high temperature wind tunnel under strong impact and strong electromagnetic interference environment of the present invention is as follows:

[0009] The vibration measuring device for high temperature wind tunnel under strong impact and strong electromagnetic interference environment of the present invention comprises a square base adapter block, a square gasket and a sensor mounting seat which are sequentially stacked from bottom to top;

[0010] At the four corners of the sensor mounting base, special-shaped bolts are installed through threaded connection from top to bottom, passing through the sensor mounting base, the square gasket and the base adapter block in sequence. The special-shaped bolts are insulated from the sensor mounting base and the square gasket.

[0011] Install the vibration sensor by threading it in the center of the sensor mount.

[0012] Furthermore, the middle part of the bolt section of the special-shaped bolt is thinner than the upper end and the lower end, and the middle part is covered with a layer of PVC sleeve, and the height of the PVC sleeve is slightly higher than the sensor mounting seat.

[0013] Furthermore, a circular ring-shaped gasket is mounted on the special-shaped bolt, and the circular ring-shaped gasket is a PVC gasket.

[0014] Furthermore, the square gasket is a PVC gasket.

[0015] Furthermore, the base adapter block is fixed on the outer wall surface of the device under test by welding.

[0016] The vibration measuring device of the present invention for use in a high-temperature wind tunnel under strong impact and strong electromagnetic interference environment has the following characteristics:

[0017] 1. The multi-layer sub-structure threaded connection method is used on the connecting bolts, combined with PVC sleeves and gaskets to effectively isolate electromagnetic interference;

[0018] 2. The multi-hole threaded connection is used to effectively protect the vibration sensor so that it can be stably installed on the surface of the measured object under strong impact and will not loosen or fly out.

[0019] In short, the vibration measuring device for high-temperature wind tunnels with strong impact and strong electromagnetic interference environments of the present invention aims at the strong electromagnetic interference problem that needs to be solved in the vibration measurement of high-temperature wind tunnel equipment. A measuring device with an insulating assembly of special-shaped bolts, PVC gaskets and sleeves, and a multi-directional threaded connection method of a sensor mounting seat and a base adapter block is designed. This device can not only ensure that the vibration sensor is firmly installed on the outer wall surface under a strong impact environment, but also ensure that the internal structure of the vibration sensor is not affected under strong electromagnetic interference, thereby ensuring the safe and stable operation of the sensor, achieving the reliability of the measured data, and improving the data signal-to-noise ratio.

[0020] To sum up, the vibration measuring device for high-temperature wind tunnels with strong impact and strong electromagnetic interference environments of the present invention comprehensively adopts a multi-layer structure and a multi-directional threaded connection method, which effectively solves the problem of strong electromagnetic interference in vibration measurement of high-temperature wind tunnel equipment, and effectively protects the vibration sensor from the influence of strong electromagnetic interference. At the same time, it avoids the problem of the sensor loosening and flying out under strong impact during the test, extends the service life of the vibration sensor, and ensures that accurate vibration data is continuously provided to the wind tunnel data acquisition system during the test. While accurately obtaining vibration data, it can also ensure the safety and reliability of the vibration sensor, providing data support for the health status monitoring of wind tunnel equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1a It is a structural schematic diagram (stereoscopic diagram) of the vibration measurement device for use in a high-temperature wind tunnel under strong impact and strong electromagnetic interference environments of the present invention;

[0022] Figure 1b It is a structural schematic diagram (top view) of the vibration measurement device for high-temperature wind tunnels under strong impact and strong electromagnetic interference environments of the present invention;

[0023] Figure 1c It is a structural schematic diagram (AA cross-sectional view) of the vibration measurement device for use in a high-temperature wind tunnel under strong impact and strong electromagnetic interference environments of the present invention;

[0024] Figure 1d It is a structural schematic diagram of the vibration measurement device for high-temperature wind tunnel under strong impact and strong electromagnetic interference environment of the present invention (PVC casing cross-sectional diagram);

[0025] Figure 2 It is a schematic diagram of the structure of the special-shaped bolts used in the vibration measurement device under the strong impact and strong electromagnetic interference environment of the high-temperature wind tunnel of the present invention;

[0026] Figure 3 It is a schematic diagram of the structure of the annular gasket used in the vibration measurement device under the strong impact and strong electromagnetic interference environment of the high temperature wind tunnel of the present invention;

[0027] Figure 4 It is a schematic diagram of the structure of a sensor mounting seat used in a vibration measurement device in a high-temperature wind tunnel with strong impact and strong electromagnetic interference environment according to the present invention;

[0028] Figure 5 It is a schematic diagram of the structure of a square gasket used in a vibration measurement device in a high-temperature wind tunnel with strong impact and strong electromagnetic interference environment according to the present invention;

[0029] Figure 6 The present invention is a schematic diagram of the structure of a base adapter block in a vibration measuring device for use in a high-temperature wind tunnel under strong impact and strong electromagnetic interference environments.

[0030] In the figure, 1. Special-shaped bolt; 2. PVC sleeve; 3. Ring-shaped gasket; 4. Sensor mounting base; 5. Square gasket; 6. Base adapter block; 7. Vibration sensor. DETAILED DESCRIPTION

[0031] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0032] Example: Figure 1a~Figure 1d , Figure 2~Figure 6As shown, the whole measuring device includes four special-shaped bolts 1, which are distributed at the four corners of the sensor mounting seat 4. The vibration sensor 7 is connected and fixed at the center of the sensor mounting seat 4 through the M5 threaded hole. The middle part of the bolt section of the special-shaped bolt 1 is thinner than the upper and lower ends, with a diameter of M4, and is covered with a layer of PVC sleeve 2. The special-shaped bolt 1 with the PVC sleeve 2 is passed through the circular gasket 3, the sensor mounting seat 4, and the square gasket 5 in sequence, and connected to the base adapter block 6 through the M5 threaded hole. The square gasket 5 installed between the base adapter block 6 and the sensor mounting seat 4 is the same length and width as the lower surface of the sensor mounting seat 4, with a thickness of about 1mm. The square gasket 5 is a PVC gasket. The height of the PVC sleeve 2 in the middle part of the special-shaped bolt 1 is slightly higher than the sensor mounting seat 4, and the body of the special-shaped bolt 1 does not directly contact the sensor mounting seat 4. Then the bottom of the base adapter block 6 is welded to the outer wall of the device under test. Finally, the vibration sensor 7 is connected to the test data acquisition system of the high-temperature wind tunnel to provide data parameters for various high-temperature tests and long-term hot tests.

[0033] The vibration measurement device of this embodiment is used in a high-temperature wind tunnel under strong impact and strong electromagnetic interference environment, realizes the insulation installation between the outer surface of the high-temperature wind tunnel device under test and the vibration sensor 7, and ensures that the measurement device does not shake and the vibration sensor 7 does not loosen under strong impact, and the measurement data can truly respond to the vibration characteristics of the device under test.

[0034] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and implementation modes. For those familiar with the art, all features disclosed in the present invention, or steps in all methods or processes disclosed, except for mutually exclusive features and / or steps, can be combined in any way without departing from the principles of the present invention. The present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A vibration measurement device used in high temperature wind tunnels with strong impact and strong electromagnetic interference environments, characterized in that: The vibration measuring device comprises a square base adapter block (6), a square gasket (5), and a sensor mounting seat (4) which are stacked in sequence from bottom to top; Special-shaped bolts (1) are installed at the four corners of the sensor mounting base (4) by means of threaded connection, and penetrate the sensor mounting base (4), the square gasket (5) and the base adapter block (6) from top to bottom in sequence. The special-shaped bolts (1) are insulated from the sensor mounting base (4) and the square gasket (5); A vibration sensor (7) is installed at the center of the sensor mounting base (4) by means of a threaded connection; The middle part of the bolt section of the special-shaped bolt (1) is thinner than the upper end and the lower end, and the middle part is covered with a layer of PVC sleeve (2), and the height of the PVC sleeve (2) is slightly higher than the sensor mounting seat (4); The special-shaped bolt (1) is sleeved with a circular ring gasket (3), which is a PVC gasket; The square gasket (5) is a PVC gasket.

2. The vibration measurement device for high temperature wind tunnel under strong impact and strong electromagnetic interference environment according to claim 1 is characterized in that: The base adapter block (6) is fixed to the outer wall surface of the device under test by welding.

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