A wide frequency range rotary piston temperature and pressure sensor dynamic calibration device

Abstract

The application belongs to the field of temperature and pressure sensor dynamic calibration, and discloses a wide frequency range rotary table type temperature and pressure sensor dynamic calibration device based on periodic signal excitation, which comprises a mounting platform, a shell protection system for protecting test personnel, a motor system for providing power for the whole device, a rotary table system for frequency response calibration, a displacement system for adjusting the positions of sensors and gas sources, and a gas source system for providing different kinds of gas sources; the application is based on an integrated configuration, and the wide frequency range frequency response calibration of different types of temperature and pressure sensors can be realized by changing the motor speed or replacing different hole number rotary tables; the application has the advantages of simple operation, wide calibration frequency range, and the highest frequency response calibration of 25 kHz sensors.

Description

Technical Field

[0001] This invention belongs to the field of dynamic calibration of temperature and pressure sensors, and specifically relates to a sensor frequency response calibration device, which is suitable for calibrating the frequency response of dynamic temperature and pressure sensors. Background Technology

[0002] Frequency response is one of the important performance indicators of dynamic temperature and pressure sensors. In order to accurately measure flow field information and improve the reliability of measurement data, efficient and accurate calibration of the frequency response of dynamic sensors is particularly important. At present, the frequency response calibration system for dynamic temperature and pressure sensors is not yet complete. Therefore, how to obtain accurate frequency response of high-frequency dynamic measurement sensors, especially dynamic temperature sensors, has always been a key and difficult point to be overcome.

[0003] The purpose of dynamic frequency response calibration is to obtain the dynamic characteristics of a sensor, such as its natural frequency, frequency response, and sensitivity. Therefore, it is first necessary to excite the sensor's inherent characteristics and then analyze its effective operating frequency band. Using narrow pulse signals, sinusoidal signals in periodic functions, and step signals in transient functions as excitation signals for dynamic calibration is commonly used and is a frequently employed method in dynamic calibration. The dynamic calibration principle based on pulse signal excitation has led to square wave testing, but the calibration system of square wave testing is complex and more suitable for the frequency response calibration of hot-wire sensors. The dynamic calibration principle based on step signal excitation has led to shock tube testing and ejection testing, but these tests cause significant damage to the sensor and are not suitable for calibrating fragile sensors. The dynamic calibration principle based on periodic signal excitation has led to laser testing, but laser testing is currently immature, and its accuracy needs further verification. Furthermore, the above calibration methods have only developed mature systems for pressure sensors, and research on the dynamic frequency response calibration of temperature sensors is still limited.

[0004] Therefore, there is an urgent need to develop a frequency response device transposition method that can quickly, accurately, and efficiently adapt to various types of dynamic temperature and pressure sensors, so as to provide an efficient and accurate method for frequency response calibration of dynamic temperature and pressure sensors. Summary of the Invention

[0005] To address the shortcomings or improvement needs of existing technologies, this invention provides a wide-frequency-domain rotary temperature and pressure sensor dynamic calibration device, enabling wide-frequency-domain calibration of temperature and pressure sensors.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows:

[0007] 1. A wide-frequency-domain rotary temperature and pressure sensor dynamic calibration device, comprising a mounting platform, a housing protection system for protecting test personnel, a motor system for powering the entire device, a rotary system for adjusting the frequency response, a displacement system for adjusting the sensor and gas source positions, and a gas source system for changing the type of gas source; consisting of a motor control box (1), a mounting base (2), a bearing mounting seat (3), a gas guide pipe (4), a motor mounting seat (5), a high-speed motor (6), a coupling (7), a bearing (8), a housing (9), a rotary table (10), a sensor (11), a clamping device (12), a displacement mechanism (13), a guide plate (14), an airflow hole (15), a rotary table mounting hole (16), a guide groove (17), and an X-axis adjustment knob (18). The device consists of a Y-axis adjustment knob (19), a Z-axis adjustment knob (20), and a clamping device mounting hole (21). Its features include: a displacement mechanism (13), a bearing mounting seat (3), and a motor mounting seat (5), all fixed to the mounting base plate (2) by bolts; a high-speed motor (6) fixed to the motor mounting seat (5) by bolts; a bearing (8) fixed to the bearing mounting seat (3) by bolts; a turntable (10) connected to a rotating shaft by bolts; the rotating shaft connected to the high-speed motor (6) by a coupling (7); a clamping mechanism (12) fixed to the displacement mechanism (13) by bolts; and the heights of the motor mounting seat (5) and the bearing mounting seat (3) adjusted according to the relative height of the high-speed motor (6) and the bearing (8) to ensure the rotating shaft is horizontal.

[0008] 2. The turntable (10) is replaceable, with a diameter of 100 mm to 400 mm and a thickness of 3 mm to 10 mm. The turntable is equipped with airflow holes, guide grooves, and guide plates. The diameter of the turntable can be adjusted according to the sensor to be calibrated to achieve wide frequency response dynamic calibration.

[0009] 3. The airflow holes of the turntable are evenly distributed in the circumference, with equal diameter through holes, numbering from 10 to 200, and diameters from 1 mm to 10 mm. The airflow holes are 2 mm to 3 mm away from the edge of the turntable.

[0010] 4. A guide groove is opened between two adjacent holes of the turntable. The depth is 1 mm to 6 mm and the length is 5 mm to 20 mm. The distance between the two sides of the groove and the edge of the hole is 0.5 mm to 1.5 mm. When the airflow does not pass through the airflow hole, the airflow can flow out along the guide plate to prevent the airflow from being blocked and overflowing along the airflow hole, thereby reducing the interference of the flow field on the windward side of the sensor's sensing part.

[0011] 5. The turntable is surrounded by a guide plate with a width of 3 mm to 5 mm and an outer edge height of 5 mm to 15 mm. The guide plate is tilted at an angle of 5° to 60° with the axis of the turntable (10) to prevent airflow from overflowing at the edge of the turntable and reduce interference from the windward flow field of the sensor sensing part.

[0012] 6. The outer shell (9) includes three transparent baffles: upper, front, and rear, with a length of 700 mm to 800 mm, a width of 400 mm to 500 mm, and a height of 400 mm to 500 mm. They are connected to the mounting base plate (2) by threads to protect the personal safety of the test personnel and prevent unnecessary safety hazards caused by malfunctions during the operation of the entire device.

[0013] 7. The speed of the high-speed motor (6) is continuously adjustable from 0 to 8000 rpm, realizing wide frequency response dynamic calibration. The external cable of the high-speed motor (6) is connected to the motor control box (1). The motor control box (1) can display the speed of the motor in real time and is equipped with a speed adjustment button and a height motor (6) emergency stop button for easy operation by test personnel.

[0014] 8. The air guide tube (4) is connected to a constant temperature and pressure air source on the left. The diameter of the air guide tube is 1 mm to 10 mm. It is fixed to the clamping device (12) by a set screw. The right end is adjusted by adjusting the X-axis adjustment knob (18), Y-axis adjustment knob (19), and Z-axis adjustment knob (20) of the displacement mechanism (13) to ensure that the distance between the air outlet of the air guide tube and the turntable (10) is 2 mm to 5 mm. The air guide tube and a certain air flow hole (15) of the turntable (10) are coaxial. The switching between the frequency response calibration of the temperature sensor and the frequency response calibration of the pressure sensor is realized by changing the air flow temperature.

[0015] 9. The sensor (11) is fixed to the clamping device (12) by a set screw. The X-axis adjustment knob (18), Y-axis adjustment knob (19), and Z-axis adjustment knob (20) of the displacement mechanism (13) are adjusted to move it in the XYZ direction. The range of movement in the three directions is 50 mm to 200 mm. The sensor is rotated perpendicular to the turntable plane by changing the mounting hole (21) of the clamping device. The actual airflow speed is obtained by synthesizing the outlet speed of the air duct and the rotation speed of the turntable according to the speed triangle, so as to ensure that the sensing part of the sensor is facing the actual airflow speed direction.

[0016] 10. Install the base plate (2) with a thickness of 3 mm to 5 mm, a length of 700 mm to 800 mm, and a width of 400 mm to 500 mm.

[0017] 11. Furthermore, the method of using the above-mentioned wide-frequency domain rotary temperature and pressure sensor dynamic calibration device specifically includes the following steps:

[0018] S1. Select a suitable turntable based on the sensor frequency response; let the motor speed be n (r / min), the number of holes on the turntable be N (holes), and the calibration frequency response of the calibration device be f (Hz); then f = n * N / 60;

[0019] S2. Install the calibration device and connect the motor control device to the frequency converter motor;

[0020] S3. The air duct is connected to a constant temperature and pressure air source, and its position is adjusted by a three-dimensional displacement mechanism so that the air outlet is directly opposite the turntable hole;

[0021] S4. Install the sensor and adjust its position using a three-dimensional displacement mechanism so that the sensor's sensing part is directly opposite the turntable hole;

[0022] S5. Ensure that all cables and air pipes are connected correctly, and install the calibration device housing protection system;

[0023] S6. Turn on the power and start the test;

[0024] S7. After completing the experiment, export all data to a computer for analysis;

[0025] S8. Analyze the data to understand the frequency response characteristics of the sensor;

[0026] S9. Change the motor speed to change the jet frequency, and repeat S6, S7, and S8.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] Benefit 1: This invention can perform dynamic frequency response calibration on temperature and pressure sensors of different models.

[0029] Second beneficial effect: This invention can achieve wide frequency response calibration, up to 25kHz.

[0030] Benefit 3: The turntable of this invention is designed with a guide groove and a guide plate, which reduces the interference of the airflow on the windward side of the turntable on the flow field of the sensor's sensing part, resulting in accurate and reliable frequency response results.

[0031] Fourthly, the turntable of this invention is detachable, and turntables with different numbers of holes can be installed. The motor has a wide range of stepless speed regulation, which can achieve continuous variable speed over a wide frequency range.

[0032] Benefit 5: Compared with the frequency response calibration system in the prior art, the present invention has a lower construction cost and causes less wear and tear on the sensor during the test process, thus extending the sensor's service life.

[0033] Benefit 6: This invention is based on an integral configuration, which is simple in structure and easy to operate. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the entire device at a 45° angle in an embodiment of the present invention.

[0035] Figure 2 This is a front view of the turntable in an embodiment of the present invention.

[0036] Figure 3 This is a rear view of the turntable in an embodiment of the present invention.

[0037] Figure 4 This is a partial cross-sectional view of the turntable along the guide groove in an embodiment of the present invention.

[0038] Figure 5 This is a partial cross-sectional view of the turntable along the airflow hole in an embodiment of the present invention.

[0039] Figure 6 This is a schematic diagram of the turntable tilted at 45° in an embodiment of the present invention.

[0040] Figure 7 This is a schematic diagram of the displacement system at a 45° angle in an embodiment of the present invention.

[0041] Figure 8 This is a top view of the three-dimensional displacement mechanism in the displacement system of this invention.

[0042] Figure 9 This is a schematic diagram of the clamping mechanism at a 45° angle in an embodiment of the present invention.

[0043] Figure 10 This is a schematic diagram of the bearing support in an embodiment of the present invention.

[0044] Figure 11 This is a schematic diagram of the motor support in an embodiment of the present invention.

[0045] In all the attached drawings: 1-motor control box, 2-mounting base plate, 3-bearing mounting seat, 4-air guide pipe, 5-motor mounting seat, 6-variable frequency motor, 7-coupling, 8-bearing, 9-housing, 10-turntable, 11-sensor, 12-clamping device, 13-displacement mechanism, 14-guide plate, 15-airflow hole, 16-turntable mounting hole, 17-guide groove, 18-X-axis adjustment knob, 19-Y-axis adjustment knob, 20-Z-axis adjustment knob, 21-clamping device mounting hole, 22-bearing mounting support, 23-motor mounting support. Detailed Implementation

[0046] The present invention will be further described below with reference to the accompanying drawings:

[0047] An example using a 16kHz high-frequency temperature probe:

[0048] As attached Figures 1 to 11 As shown, the present invention provides a wide frequency domain rotary temperature and pressure sensor dynamic calibration device, specifically including an installation platform, an outer shell protection system for protecting test personnel, a motor system for powering the entire device, a rotary system for adjusting the frequency response, a displacement system for adjusting the position of the sensor and the gas source, and a gas source system for changing the type of gas source.

[0049] The mounting platform has a mounting base plate (2), a motor support seat (23), and a bearing support seat (22). The mounting base plate (2) is connected to the motor support seat (23) and the bearing support seat (22) by bolts. The motor support seat (23) and the bearing support seat (22) ensure the concentricity between the turntable system and the motor output shaft.

[0050] The aforementioned outer shell protection system includes three transparent baffles (9) at the top, front, and rear, which are connected to the mounting base plate (2) by bolts. Its characteristic is to protect the personal safety of the test personnel and prevent unnecessary safety hazards caused by malfunctions during the operation of the entire device.

[0051] The motor system includes a high-speed motor (6) and a motor control box (1). The high-speed motor (6) is fixed to the motor support base (23) by bolts and connected to the motor control box (1) by cables. The motor control box (1) can display the motor speed in real time and is equipped with a speed adjustment button and a motor emergency stop button for easy operation by the test personnel.

[0052] The turntable system includes a rotating shaft and a turntable (10). The turntable is bolted to the rotating shaft, and the rotating shaft is connected to a high-speed motor (6) via a coupling (7).

[0053] The displacement system includes two three-dimensional displacement mechanisms (13) on the left and right, and a clamping device (12). The clamping device on the left clamps the air source, and the clamping device on the right clamps the temperature or pressure sensor. The displacement mechanism can move within a range of 100 mm in the X direction by adjusting the X-axis adjustment knob (18), move within a range of 100 mm in the Y direction by adjusting the Y-axis adjustment knob (19), and move within a range of 100 mm in the Z direction by adjusting the Z-axis adjustment knob (20). By changing the position of the air guide tube (4) and the sensor (11), the air flow hole (15) of the turntable (10) is ensured to be coaxial and aligned. The sensing part (11) of the sensor is 3 mm away from the turntable (10).

[0054] The gas source system includes a constant temperature and pressure gas source and a gas guide pipe (4). The gas guide pipe is connected to the constant temperature and pressure gas source and fixed to the clamping device (12). The gas outlet is 3 mm away from the turntable (10). The constant temperature and pressure gas source releases high-temperature gas at 100 degrees Celsius and 1.5 atmospheres to calibrate the high-frequency temperature sensor.

[0055] Furthermore, the high-speed motor (6) has a high speed and the speed is continuously adjustable from 0 to 8000 rpm, achieving a wide range of continuous speed adjustment and realizing dynamic calibration of wide frequency response.

[0056] Furthermore, the turntable (10) is detachable and has airflow holes (15), guide grooves (17), and guide plates (14). The diameter of the turntable is 300 mm, which enables dynamic calibration of the frequency response in a wide frequency range.

[0057] Furthermore, the turntable airflow holes (15) are evenly distributed with 160 through holes of 3 mm diameter in the circumference, and the distance between the center of the hole and the edge of the turntable is 5 mm, so as to realize the dynamic calibration of the frequency response in the wide frequency domain.

[0058] Furthermore, there are guide grooves (17) equidistantly spaced between two adjacent holes on the turntable. The width of the guide groove is 2 mm and the length is 6 mm. When the airflow does not pass through the airflow hole, the airflow flows out along the guide plate (14) to prevent the airflow from being blocked and overflowing along the airflow hole, thereby reducing the interference of the windward flow field of the sensor sensing part.

[0059] Furthermore, there is a guide plate (14) around the turntable. The guide plate has a certain tilt angle to prevent the airflow from overflowing at the edge of the turntable and reduce the interference of the windward flow field of the sensor sensing part.

[0060] Furthermore, the displacement mechanism (12) drives the clamping mechanism to move 100 mm in the three-dimensional X\Y\Z direction. After changing different turntables and sensors, the air duct, a certain hole of the turntable, and the sensor are made coaxial.

[0061] Furthermore, the sensor clamping mechanism (13) can adjust its installation position according to the structure of the sensor sensing part. By aligning the different clamping device mounting holes (21) on the displacement mechanism with the sensor sensing part parallel to or perpendicular to the turntable plane, the sensor sensing part can be aligned with the incoming flow direction, thereby achieving accurate calibration of the sensor's dynamic frequency response.

[0062] Furthermore, the method of using the aforementioned wideband rotary temperature and pressure sensor dynamic calibration device specifically includes the following steps:

[0063] S1. Select a suitable turntable based on the sensor frequency response; let the motor speed be n (r / min), the number of holes on the turntable be N (holes), and the calibration frequency response of the calibration device be f (Hz); then f = n * N / 60;

[0064] S2. Install the calibration device and connect the motor control device to the frequency converter motor;

[0065] S3. Connect the air duct to the constant temperature and pressure air source, and adjust its position through the three-dimensional displacement mechanism so that the air outlet is directly facing the turntable hole.

[0066] S4. Install the sensor and adjust its position using the three-dimensional displacement mechanism so that the sensor's sensing part is directly opposite the turntable hole.

[0067] S5. Ensure that all cables and air pipes are connected correctly and that the calibration device housing protection system is installed.

[0068] S6. Connect the power supply and start the test;

[0069] S7. After completing the experiment, export all data to the computer for analysis;

[0070] S8. Analyze the data to understand the frequency response characteristics of the sensor;

[0071] S9. Change the motor speed to change the jet frequency, and repeat S6, S7, and S8.

[0072] Any technical solution that achieves the above-mentioned technical effects by utilizing the technical solutions described in this invention, or by designing similar technical solutions by those skilled in the art under the inspiration of the technical solutions described in this invention, falls within the protection scope of this invention.

Claims

1. A wide-frequency-domain rotary temperature and pressure sensor dynamic calibration device, comprising a mounting platform, a protective housing system for protecting test personnel, a motor system for powering the entire device, a rotary system for adjusting the frequency response, a displacement system for adjusting the sensor and gas source positions, and a gas source system for changing the type of gas source; composed of a motor control box (1), a mounting base plate (2), a bearing mounting seat (3), a gas guide pipe (4), a motor mounting seat (5), a high-speed motor (6), a coupling (7), a bearing (8), a housing (9), a rotary table (10), a sensor (11), a clamping device (12), a displacement mechanism (13), a guide plate (14), an airflow hole (15), a rotary table mounting hole (16), a guide groove (17), an X-axis adjustment knob (18), a Y-axis adjustment knob (19), a Z-axis adjustment knob (20), and a clamping device mounting hole (21), characterized in that: The displacement mechanism (13), bearing mounting base (3), and motor mounting base (5) are fixed to the mounting base plate (2) by bolts. The high-speed motor (6) is fixed to the motor mounting base (5) by bolts. The bearing (8) is fixed to the bearing mounting base (3) by bolts. The turntable (10) is connected to the rotating shaft by bolts. The rotating shaft is connected to the high-speed motor (6) by coupling (7). The clamping device (12) is fixed to the displacement mechanism (13) by bolts. The height of the motor mounting base (5) and bearing mounting base (3) is adjusted according to the relative height position of the high-speed motor (6) and the bearing (8) to ensure that the rotating shaft is horizontal. The turntable (10) is replaceable, with a diameter of 100 mm to 400 mm and a thickness of 3 mm to 10 mm. The turntable is equipped with airflow holes, guide grooves, and guide plates. The diameter of the turntable can be adjusted according to the sensor to be calibrated to achieve wide frequency response dynamic calibration. The airflow holes on the turntable are evenly distributed in the circumference, are equal-diameter through holes, number 10 to 200, and have a diameter of 1 mm to 10 mm. The airflow holes are 2 mm to 3 mm away from the edge of the turntable. A guide groove is opened between two adjacent holes on the turntable. The depth is 1 mm to 6 mm and the length is 5 mm to 20 mm. The distance between the two sides of the groove and the edge of the hole is 0.5 mm to 1.5 mm. When the airflow does not pass through the airflow hole, the airflow can flow out along the guide plate to prevent the airflow from being blocked and overflowing along the airflow hole, thereby reducing the interference of the flow field on the windward side of the sensor's sensing part. The turntable is surrounded by a guide plate with a width of 3 mm to 5 mm and an outer edge height of 5 mm to 15 mm. The guide plate is tilted at an angle of 5° to 60° to the axis of the turntable (10) to prevent airflow from overflowing at the edge of the turntable and reduce interference from the windward flow field of the sensor sensing part. The outer shell (9) includes three transparent baffles, which are 700 mm to 800 mm long, 400 mm to 500 mm wide, and 400 mm to 500 mm high. They are connected to the mounting base plate (2) by threads to protect the personal safety of the test personnel and prevent unnecessary safety hazards caused by malfunctions during the operation of the entire device. The speed of the high-speed motor (6) is continuously adjustable from 0 to 8000 rpm, realizing wide frequency response dynamic calibration. The external cable of the high-speed motor (6) is connected to the motor control box (1). The motor control box (1) can display the speed of the motor in real time and is equipped with a speed adjustment button and a high-speed motor (6) emergency stop button for easy operation by test personnel. The air guide tube (4) is connected to a constant temperature and pressure air source on the left. The diameter of the air guide tube is 1 mm to 10 mm. It is fixed to the clamping device (12) by a set screw. The right end is adjusted by adjusting the X-axis adjustment knob (18), Y-axis adjustment knob (19), and Z-axis adjustment knob (20) of the displacement mechanism (13) to ensure that the air outlet of the air guide tube is 2 mm to 5 mm away from the turntable (10). The air guide tube and a certain air flow hole (15) of the turntable (10) are coaxial. The switching between the frequency response calibration of the temperature sensor and the frequency response calibration of the pressure sensor is realized by changing the air flow temperature. The sensor (11) is fixed to the clamping device (12) by a set screw. The X-axis adjustment knob (18), Y-axis adjustment knob (19), and Z-axis adjustment knob (20) of the displacement mechanism (13) are adjusted to move it in the XYZ direction. The range of movement in the three directions is 50 mm to 200 mm. The sensor is rotated perpendicular to the turntable plane by changing the mounting hole (21) of the clamping device. The actual airflow speed is obtained by synthesizing the outlet speed of the air duct and the rotation speed of the turntable according to the speed triangle, ensuring that the sensing part of the sensor is facing the actual airflow speed direction. The mounting base plate (2) is 3 to 5 mm thick, 700 to 800 mm long, and 400 to 500 mm wide.

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