A pressure sensor calibration bench

Abstract

This utility model relates to the field of sensor calibration technology, specifically to a pressure sensor calibration bench, characterized by: a housing, on which a test connector is mounted, the test connector being connected to a tank inside the housing via a connecting pipe; the tank being connected to a first calibration device and a second calibration device via connecting pipes respectively; a pressurizing device is mounted on one side of the second calibration device, the pressurizing device being connected to the tank; a temperature regulating device is mounted on one side of the tank, the temperature regulating device being connected to the interior of the tank; and a display module is mounted on the housing, the display module being electrically connected to the first calibration device, the second calibration device, and the sensor under test. The purpose of this utility model is to solve the problems of low calibration accuracy, significant susceptibility to ambient temperature, and inconvenient data acquisition and processing in existing pressure sensor calibration processes.

Description

Technical Field

[0001] This utility model belongs to the field of sensor calibration technology and relates to a pressure sensor calibration bench. Background Technology

[0002] Pressure sensors, as key measuring components, are widely used in pressure monitoring across numerous fields such as industrial production and scientific research. For example, in the chemical fiber production process, accurate monitoring of the pressure inside the pressure tank plays a crucial role in production stability and product quality, and the pressure sensor is the core component for achieving this monitoring function. Accurate and reliable pressure sensors can provide real-time pressure data feedback, ensuring the stable operation of production equipment and guaranteeing that the production process proceeds according to preset parameters.

[0003] However, during long-term use, pressure sensors inevitably develop errors in their pressure measurements. Taking chemical fiber production as an example, pressure sensor errors can cause deviations in the pressure display within the pressure tank, thus affecting normal production and potentially leading to adverse consequences such as decreased product quality and reduced production efficiency. In other fields, such as petrochemicals and aerospace, pressure sensor errors can similarly cause serious safety hazards and production accidents.

[0004] After reviewing relevant materials, several solutions exist in the existing technology for addressing pressure sensor error issues. For example, the patent CN221549916U, titled "A Pressure Sensor Calibration Device," calibrates the pressure sensor by setting up a calibration chamber, supplying air into the chamber via an inflation tube, connecting a pressure gauge to the chamber, placing the pressure sensor in the calibration tube, and connecting it to a pressure display. The pressure sensor error is determined by comparing the pressure values ​​on the gauge and the display, thus calibrating the sensor. The device also includes a limiting component to prevent the mounting post from separating from the calibration tube and affecting the calibration, and a sealing component to prevent air leakage from the calibration chamber. The advantages of this calibration device are its relatively simple structure and low cost, which can meet the basic requirements for pressure sensor calibration to a certain extent. However, it also has significant drawbacks. It only uses a single comparison method for calibration, lacking comparative verification with multiple calibration devices, resulting in limited accuracy and reliability of the calibration results. Furthermore, the device does not consider the impact of temperature on pressure sensor calibration, which may lead to deviations in calibration results under different temperature conditions. In addition, the device lacks an integrated data display module, making data acquisition inconvenient for operators and hindering efficient calibration.

[0005] Based on a comprehensive analysis of the advantages and disadvantages of existing solutions, it is necessary to develop a new pressure sensor calibration bench to more accurately and efficiently address the calibration issues of pressure sensors in actual production. This calibration bench should have more comprehensive calibration functions, such as setting up multiple calibration devices for comparative calibration, equipping it with a temperature control device to reduce the interference of temperature on the calibration results, and integrating a display module to facilitate operators to obtain and analyze data in real time, thereby comprehensively improving the accuracy, reliability, and ease of operation of pressure sensor calibration. Summary of the Invention

[0006] This invention provides a pressure sensor calibration bench, which solves the problems of low calibration accuracy, large influence from ambient temperature, and inconvenience in data acquisition and processing in the existing pressure sensor calibration process.

[0007] To solve the above problems, the technical solution adopted by the invention is as follows:

[0008] A pressure sensor calibration bench includes a housing, on which a test connector is mounted. The test connector is connected to a tank inside the housing via a connecting pipe. The tank is also connected to a first calibration device and a second calibration device via connecting pipes. A pressurizing device is mounted on one side of the second calibration device and is connected to the tank. A temperature regulating device is mounted on one side of the tank and is connected to the interior of the tank. A display module is mounted on the housing and is electrically connected to the first calibration device, the second calibration device, and the sensor under test.

[0009] The principle and advantages of this scheme are as follows:

[0010] Pressure is applied to the tank inside the chamber via a pressurization device. This pressure is transmitted through connecting pipes to the test connector, the first calibration device, and the second calibration device, ensuring that the pressure sensor under test is connected to the test connector and that the first and second calibration devices are under the same pressure environment. A temperature control device regulates the ambient temperature inside the tank, simulating the temperature conditions of the pressure sensor under different actual working scenarios. The first and second calibration devices compare and verify the pressure data measured by the pressure sensor under test, obtaining calibration data. Simultaneously, the data from the pressure sensor under test, the first calibration device, and the second calibration device are transmitted in real time to the display module for easy observation and analysis by the operator. The entire process, through precise control of pressure and temperature, and the use of dual calibration devices for comparison and centralized data display, achieves comprehensive and accurate calibration of the pressure sensor.

[0011] In the prior art, a single calibration device is often used. Once the calibration device fails or the calibration is inaccurate, it is difficult to detect and it will lead to deviation of the calibration result. This solution sets up a first calibration device and a second calibration device, and the two can compare calibration data with each other. For example, when batch-calibrating pressure sensors on an industrial production line, if only a single calibration device is used, sensors with errors may be misjudged as qualified. However, through the comparison of the dual-calibration devices in this solution, data differences can be found in time, the misjudgment rate can be effectively reduced, and the reliability of the calibration result can be ensured.

[0012] The prior art often ignores the influence of temperature on the calibration of pressure sensors. In actual use, temperature changes will interfere with the performance of the sensors. The temperature adjustment device in this solution can simulate different temperature environments to conduct a more comprehensive calibration of the pressure sensors. For example, in the aerospace field, pressure sensors will work in extremely cold or high-temperature environments. This calibration bench can calibrate under the corresponding temperature conditions to ensure the accuracy of the sensors in complex environments, which is difficult to achieve in the prior art.

[0013] In the prior art, operators may need to use additional equipment to read the data of the calibration device and the sensors to be tested, which is cumbersome and error-prone. In this solution, the display module is electrically connected to each device and the sensors to be tested, and can centrally display the data. For example, when calibrating on-site in a chemical enterprise, operators can directly view and compare the data on the display module to quickly determine whether the sensors are qualified, without frequently switching equipment to read data, greatly improving the calibration efficiency and reducing human errors.

[0014] Further, the connector to be tested is fixedly connected to one end of the connecting pipe and is pluggable to the sensor to be tested. In actual calibration work, different sensors to be tested need to be frequently replaced. The pluggable connection with the sensor to be tested greatly simplifies the installation and disassembly processes. Compared with traditional fixed connection methods, such as welding or bolt fastening connections, operators can quickly replace the sensor to be tested without the aid of complex tools, effectively saving the preparation time before calibration and the equipment arrangement time after calibration, and improving the overall calibration work efficiency. For example, when calibrating multiple pressure sensors of different models, the staff can quickly unplug the calibrated sensor and plug in the sensor to be calibrated, and the operation is simple and fast.

[0015] Further, multiple buckles are provided on the connector to be tested, and the buckle is hinged to the lower end of the connection head. During the calibration process of the pressure sensor, the connection tightness between the sensor to be tested and the connector to be tested is crucial. When the buckle rotates around the hinge point and buckles on the connection head, it can apply uniform and stable pressure to the connection part. The buckle is hinged to the lower end of the connection head, which can adapt to connection heads of different shapes and sizes. After the buckle is buckled, it can firmly fix the connection head, preventing the connection from loosening due to external factors such as vibration and collision during the calibration process, and improving the safety.

[0016] Furthermore, a fixing block is provided at the connection point of the sensor under test, and multiple limiting grooves are provided on the fixing block. These limiting grooves cooperate with the buckle, and the multiple limiting grooves and buckles cooperate with each other to secure the connection from multiple directions. When the equipment vibrates during operation or is subjected to external impact, the limiting grooves can effectively limit the movement of the buckle, thereby preventing the sensor under test from loosening or shifting. In industrial production sites, the environment around the calibration bench is complex, and vibrations from equipment operation and personnel movement can all affect the stability of the connection. Taking petrochemical enterprises as an example, the vibration during the production process is relatively large. If the connection of the sensor under test is not stable, it can easily lead to calibration interruption or inaccurate data. The connection method of limiting grooves and buckles can enhance the stability of the connection and ensure that the calibration work is not disturbed. At the same time, during installation, the operator only needs to align the buckle with the limiting groove, insert it, and rotate the buckle to complete the connection; during disassembly, the reverse operation can easily separate it. This design is simple to operate and does not require complicated installation steps and tools. When calibrating pressure sensors in batches, rapid installation and disassembly can significantly improve work efficiency. For example, in an electronics manufacturing plant, a large number of pressure sensors need to be calibrated every day. Using this connection method can significantly shorten the calibration cycle of a single sensor and improve overall production efficiency.

[0017] Furthermore, a limiting device is fixedly installed on one side of the display module. This limiting device is located directly above the sensor under test, and its bottom is equipped with a retractable pneumatic limiting rod. During pressure sensor calibration, factors such as pressure fluctuations, equipment vibration, or minor external impacts may cause the sensor under test to shift position. The pneumatic limiting rod, located directly above the sensor under test, directly acts on the sensor when extended, restricting its displacement in both vertical and horizontal directions. Because the pneumatic limiting rod is retractable, it can flexibly adapt to sensors under test of different heights. Pressure sensors from different manufacturers, or even different models from the same manufacturer, may have varying heights. By adjusting the extension length of the pneumatic limiting rod, it can be ensured that the limiting device always effectively limits the sensor under test at different heights. In sensor R&D laboratories, the calibration of various pressure sensors at different stages of development and with different structures is involved. This adjustable limiting method can meet diverse calibration needs and improve the versatility of calibration equipment.

[0018] Furthermore, a control module is electrically connected to the limiting device. This control module is fixedly mounted on the limiting device, directly electrically connected and fixed thereto, significantly shortening the signal transmission path between them. In actual verification scenarios, the extension and retraction of the pneumatic limiting rod needs to be adjusted in real time according to the verification process and the status of the sensor under test. The short electrical connection reduces signal transmission delay and interference. For example, during high-speed verification operations, the frequent extension and retraction control signals of the limiting rod can be transmitted quickly and accurately, enabling the limiting rod to respond promptly, ensuring stable limiting of the sensor under test, and avoiding untimely or malfunctioning limiting due to signal transmission problems. This, in turn, ensures the efficient and accurate execution of the verification work.

[0019] Furthermore, a limiting block with an arc-shaped structure is provided below the pneumatic limiting rod. This arc-shaped limiting block can better conform to the sensor under test with different shapes. Pressure sensors have various shapes, such as round, square, or other irregular shapes. The arc-shaped limiting block can adaptively contact the instrument's contour, increasing the contact area with the sensor under test. During the limiting process, the pressure applied by the pneumatic limiting rod is transmitted to the sensor under test through the limiting block. The arc-shaped structure can evenly distribute the pressure on the contact surface, avoiding stress concentration. If the limiting block is a planar structure, excessive local pressure may occur on the instrument surface when pressure is applied, especially for some high-precision pressure sensors made of fragile materials, which can easily damage the instrument's housing or internal components. The arc-shaped limiting block can effectively disperse the pressure, reduce this risk of damage, protect the integrity of the sensor under test, and ensure the accuracy of the calibration results and the subsequent normal use of the instrument.

[0020] Furthermore, a pressure sensor is installed on the limiting block to detect the limiting force and feed the data back to the control module. Different sensors under test may have different requirements for the limiting pressure; excessive pressure may damage the instrument, while insufficient pressure will not provide effective limiting. Based on the pressure data fed back by the pressure sensor, the control module can precisely adjust the extension and retraction force of the pneumatic limiting rod. For example, when calibrating a high-precision miniature pressure sensor, the control module precisely adjusts the limiting force based on the pressure sensor data, ensuring stable limiting while avoiding damage to the fragile miniature sensor. When calibrating a large industrial pressure sensor, it also ensures sufficient limiting force to prevent displacement. The control module can automatically control the movement of the pneumatic limiting rod according to a preset pressure threshold. When installing the sensor under test, if the pressure sensor detects that the limiting block contacts the instrument and the pressure reaches the set initial value, the control module can automatically stop the downward movement of the pneumatic limiting rod. After calibration, if the pressure sensor detects an abnormal pressure change, the control module can automatically control the limiting rod to retract, facilitating the removal of the instrument. This reduces manual intervention, improves calibration efficiency, and reduces human error.

[0021] Furthermore, a pressure relief tank is installed at the lower end of the tank body. This pressure relief tank is connected to the tank body via a circulation pump and a pressure relief valve. When the internal pressure of the tank exceeds a safety threshold, the pressure relief valve opens, and the high-pressure medium inside the tank flows into the pressure relief tank through the pressure relief valve under the action of the pressure difference. The circulation pump can assist the flow of the medium when necessary, ensuring that the pressure relief process is rapid and stable. This design can effectively prevent safety accidents such as tank rupture due to excessive pressure, ensuring the safe conduct of calibration work. For example, when calibrating pressure sensors used in high-pressure environments, the test pressure may reach a high level. If the pressure cannot be relieved in time, the tank may be subjected to excessive pressure. The cooperation of the pressure relief tank, circulation pump, and pressure relief valve can reduce the tank pressure in a timely and reliable manner, ensuring the safety of equipment and personnel. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the connection between the connector to be tested and the sensor to be tested according to this utility model. Detailed Implementation

[0024] The reference numerals in the accompanying drawings include: 1. Housing; 2. Second calibration device; 3. First calibration device; 4. Pressurizing device; 5. Sensor under test; 6. Tank; 7. Temperature regulating device; 8. Pressure relief tank; 9. Pressure relief valve; 10. Circulation pump; 11. Connecting pipe; 12. Limiting device; 13. Pneumatic limit rod; 14. Pressure sensor; 15. Display module; 16. Connector under test; 17. Limiting groove; 18. Fixing block; 19. Buckle; 20. Fixing base; 21. Limiting block; 22. Connector.

[0025] Example 1 is basically as follows Figure 1-2 As shown, a pressure sensor 14 calibration bench includes a housing 1 with a stepped structure. A tank 6 is installed inside the housing 1. A test connector 16 is installed on the housing 1. One end of the test connector 16 is fixedly connected to a connecting pipe 11, which communicates with the tank 6. The other end of the test connector 16 is fixed to the test sensor 5 by a plug-in connection, which facilitates frequent replacement of different test sensors 5 in actual calibration work. Multiple buckles 19 are provided on the test connector 16, and the buckles 19 are hinged to the lower end of the test connector 16. A fixing block 18 is provided at the connection of the test sensor 5, and multiple limiting grooves 17 are provided on the fixing block 18. The buckles 19 can be fastened in the limiting grooves 17 to tighten the connection from multiple directions.

[0026] The housing 1 is also equipped with a first verification device 3 and a second verification device 2. Both the first verification device 3 and the second verification device 2 are connected to the tank 6 through a connector 22 and a connecting pipe 11. On the housing 1, the first verification device 3 and the second verification device 2 are located on one side of the connector 16 to be tested.

[0027] A pressurizing device 4 is provided on one side of the second calibration device 2. The pressurizing device 4 is connected to the tank 6 through the connecting pipe 11 and is used to apply pressure to the tank 6, which is then transmitted to the test connector 16, the first calibration device 3 and the second calibration device 2, so that they are in the same pressure environment.

[0028] A temperature regulating device 7 is provided on one side of the tank 6. The temperature regulating device 7 is connected to the inside of the tank 6 and can regulate the ambient temperature inside the tank 6 to simulate the temperature conditions of the pressure sensor 14 under different actual working scenarios.

[0029] The housing 1 is equipped with a display module 15, which is electrically connected to the first calibration device 3, the second calibration device 2 and the sensor under test 5, and displays their data in real time, making it convenient for operators to observe and analyze.

[0030] On the housing 1, a limit device 12 is fixedly installed on one side of the display module 15. A pneumatic limit rod 13 is installed on the limit device 12. The pneumatic limit rod 13 is a telescopic structure and is located directly above the sensor 5 to be tested. A control module is also installed on the limit device 12. The control module is directly electrically connected to the limit device 12 and fixed thereon. A limit block 21 is installed below the pneumatic limit rod 13. The limit block 21 has an arc-shaped structure. A pressure sensor 14 is installed on the limit block 21. The pressure sensor 14 is electrically connected to the control module.

[0031] A pressure relief tank 8 is provided at the lower end of the tank body 6. The pressure relief tank 8 is connected to the tank body 6 through a circulation pump 10 and a pressure relief valve 9. When the internal pressure of the tank body 6 exceeds the safety threshold, the pressure relief valve 9 opens. Under the action of the pressure difference, the high-pressure medium in the tank body 6 flows into the pressure relief tank 8 through the pressure relief valve 9. The circulation pump 10 assists the medium flow to ensure that the pressure relief process is fast and stable.

[0032] During actual verification, the sensor under test 5 is first connected to the connector under test 16 via a plug-in method. The buckle 19 on the connector under test 16 is rotated to engage with the limiting groove 17 of the fixing block 18 at the connection point of the sensor under test 5, thus completing the connection and fixing. The temperature adjustment device 7 is turned on, and a simulated temperature value is set to adjust the ambient temperature inside the tank 6. Then, the pressurization device 4 is started to apply pressure to the tank 6. The pressure is transmitted through the connecting pipe 11, so that the pressure sensor under test 14 is connected to the connector under test 16, and the first verification device 3 and the second verification device 2 are in the same pressure environment. The first verification device 3 and the second verification device 2 respectively compare and verify the pressure data measured by the pressure sensor under test 14, and transmit the verification data to the display module 15 in real time.

[0033] During the calibration process, factors such as pressure fluctuations, equipment vibration, or external collisions may cause the position of the sensor under test 5 to shift. In this case, the control module controls the pneumatic limit rod 13 to extend, and the limit block 21 contacts the sensor under test 5. The pressure sensor 14 feeds back the pressure data to the control module. The control module adjusts the extension and retraction force of the pneumatic limit rod 13 according to the pressure data, so that the limit block 21 applies appropriate pressure to the sensor under test 5 to limit its displacement, while avoiding excessive pressure that could damage the instrument.

[0034] When the verification is completed or the internal pressure of tank 6 exceeds the safety threshold, if the verification is completed, the control module controls the pneumatic limit rod 13 to retract according to the data of pressure sensor 14, so as to facilitate the removal of the sensor 5 to be tested; if the pressure exceeds the safety threshold, the pressure relief valve 9 opens, the circulation pump 10 starts, and the high-pressure medium in tank 6 flows into the pressure relief tank 8 to ensure the safe conduct of the verification work.

[0035] The above are merely embodiments of the present invention. Commonly known structures and characteristics of the solutions are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A pressure sensor calibration bench, characterized in that: The device includes a housing, on which a test connector is mounted. The test connector is connected to a tank inside the housing via a connecting pipe. The tank is also connected to a first calibration device and a second calibration device via connecting pipes. A pressurizing device is mounted on one side of the second calibration device and is connected to the tank. A temperature regulating device is mounted on one side of the tank and is connected to the interior of the tank. A display module is mounted on the housing and is electrically connected to the first calibration device, the second calibration device, and the test sensor.

2. The pressure sensor calibration bench according to claim 1, characterized in that, The connector to be tested is fixedly connected to one end of the connecting tube, and the other end is plugged into the sensor to be tested.

3. The pressure sensor calibration bench according to claim 2, characterized in that, The connector to be tested is provided with multiple clips, which are hinged to the fixing seat at the lower end of the connector.

4. A pressure sensor calibration bench according to claim 3, characterized in that, A fixing block is provided at the connection of the sensor under test. The fixing block is provided with multiple limiting grooves, which are connected with the buckle.

5. A pressure sensor calibration bench according to claim 1, characterized in that, A limit device is fixedly installed on one side of the display module. The limit device is located directly above the sensor under test, and a retractable pneumatic limit rod is provided at its bottom.

6. A pressure sensor calibration bench according to claim 5, characterized in that, The limiting device is equipped with a control module that is electrically connected to the limiting device, and the control module is fixedly installed on the limiting device.

7. A pressure sensor calibration bench according to claim 5, characterized in that, A limiting block is provided under the pneumatic limiting rod, and the limiting block is arranged in an arc shape.

8. A pressure sensor calibration bench according to claim 7, characterized in that, The limiting block is equipped with a pressure sensor to detect the limiting force and feed the data back to the control module.

9. A pressure sensor calibration bench according to claim 1, characterized in that, The lower end of the tank is equipped with a pressure relief tank, which is connected to the tank body via a circulation pump and a pressure relief valve.

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