A pressure sensor integrated basic performance test system

Abstract

The present application relates to a kind of pressure sensor element comprehensive basic performance test system, including air pressure device, gas path device and multiple test stations, gas path device includes air pipe and air pressure control device, air pipe is communicated with air pressure device, each test station is communicated with air pipe, the test station at least includes refrigeration test station, can heat test station and displacement measurement station.By air pressure device provides stable gas source, and after adjusting by air pressure control device, it is sent to each test station, so that pressure sensor element is subjected to consistent air pressure loading in the testing process, to replace artificial pressing, avoid the test error caused by unstable force.Meanwhile, each test station is based on the same gas path to realize different working condition test, so that pressure sensor element completes multiple parameter detection under uniform pressure condition.Thereby can improve test consistency and data comparability, and realize multifunctional integrated test, to improve test precision and efficiency.

Description

Technical Field

[0001] This invention relates to the field of sensor testing technology, and in particular to a comprehensive basic performance testing system for pressure sensors. Background Technology

[0002] In sensor technology, deformation sensors use a deformation substrate to induce piezoresistive or piezoelectric effects in strain gauges, enabling pressure or displacement detection. Ceramic pressure cores, due to their advantages such as corrosion resistance, creep resistance, and good thermal stability, are widely used in industrial control, automotive electronics, and medical equipment.

[0003] Currently, the performance testing of ceramic pressure cores mainly employs manual pressing: a hard object is used to press and deform the substrate, and then general-purpose instruments are used to read the electrical signals. This method has significant drawbacks: First, it is difficult to ensure consistency in pressing pressure, point of application, and direction of force, leading to large differences in deformation states and poor consistency in test results, which cannot meet the stringent calibration requirements of mass production. Second, existing testing equipment has limited functionality, typically providing only fixed loading modes or limited output types (such as single voltage values), and cannot simultaneously evaluate multiple parameters such as linearity, repeatability, hysteresis, and temperature drift. Third, the equipment generally suffers from insufficient reliability, inadequate electrical safety protection, and low testing efficiency, making it difficult to meet the requirements of intelligent manufacturing for high-precision, high-efficiency, and fully automated testing. Summary of the Invention

[0004] The main objective of this invention is to propose a comprehensive basic performance testing system for pressure sensors, addressing the technical problems raised in the background section of the prior art.

[0005] To achieve the above objectives, this invention proposes a comprehensive basic performance testing system for pressure sensors, which includes: Pneumatic device; An air path device, comprising an air guide pipe, an air pressure regulating device disposed on the air guide pipe, and an airflow distribution assembly, wherein the air guide pipe is connected to the air pressure regulating device; Multiple test stations, including at least a cooling test station, a heating test station, and a displacement measurement station, each of which is connected to the air duct via the airflow distribution component; Each of the test stations includes a mounting cavity for accommodating a pressure sensor, a pressure-acting structure communicating with the mounting cavity, and a signal acquisition interface connected to the pressure sensor. The pressure-acting structure is used to introduce the air pressure output by the pneumatic device into the mounting cavity to apply pressure to the pressure sensor. The cooling test station is equipped with a cooling component for adjusting the temperature of the mounting cavity, the heating test station is equipped with a heating component for adjusting the temperature of the mounting cavity, and the displacement measurement station is equipped with a displacement transmission component that is connected to the pressure deformation part of the pressure sensor and a displacement sensor connected to the displacement transmission component. The airflow distribution component is used to control the air pressure on / off and pressure magnitude of each test station separately, so as to realize independent control or synchronous testing of multiple test stations.

[0006] Optionally, the pressure device is a high-pressure gas cylinder, and the high-pressure gas cylinder is connected to the gas delivery pipe.

[0007] Optionally, the air pressure regulating device includes a motor, a reducer driven by the motor, and a pressure regulating valve connected to the reducer, for adjusting the air pressure in the air guide pipe.

[0008] Optionally, the pressure sensor integrated basic performance testing system further includes a housing, in which the air circuit device and each test station are located, and the air pressure device is located outside the housing and connected to the air guide pipe.

[0009] Optionally, the airflow distribution assembly includes a high-pressure gas switch, a branch valve, and an emergency stop control device for controlling the opening and closing of the airflow path, all disposed on the air duct.

[0010] Optionally, the outer casing is provided with a safety door for enclosing the test station, and the safety door is provided with a visible protective window.

[0011] Optionally, the pressure sensor integrated basic performance testing system further includes a touch screen display module and a main control board, wherein the main control board is electrically connected to the touch screen display module and each test station.

[0012] Optionally, the refrigeration test station includes a first connector, a first fixing fixture, and a first protective cover. The first fixing fixture is used to fix the pressure sensor element. The first connector is installed on the first fixing fixture and is used to fix the pressure sensor element to be tested and to transmit electrical signals. The first protective cover is placed on the first fixing fixture, and the refrigeration component is disposed on the first protective cover.

[0013] Optionally, the heating test station includes a second connector, a second fixing fixture, and a second protective cover. The second fixing fixture is used to fix the pressure sensor element. The second connector is installed on the second fixing fixture and is used to fix the pressure sensor element to be tested and to transmit electrical signals. The second protective cover is placed on the second fixing fixture, and the heating component is placed on the second protective cover.

[0014] Optionally, the displacement measurement station is also provided with an exhaust port for depressurization.

[0015] This invention proposes a comprehensive basic performance testing system for pressure sensors, including a pressure device, a gas path device, and multiple test stations. The gas path device includes a gas guide pipe and a pressure control device. The gas guide pipe is connected to the pressure device, and each test station is connected to the gas guide pipe. The test stations include a cooling test station, a heating test station, and a displacement measurement station.

[0016] A unified air source is provided by a pneumatic device, and after being regulated by a pneumatic pressure regulator, the air is input to each test station. This ensures that the pressure sensor experiences a stable and consistent air pressure load during each test, thus replacing manual pressing and avoiding test errors caused by uneven force or inconsistent direction. Simultaneously, each test station, based on the same air circuit, implements low-temperature, high-temperature, and displacement measurement functions, ensuring that the pressure sensor is tested under uniform pressure conditions under different operating circumstances.

[0017] This allows for comprehensive testing of multiple parameters within the same system, effectively solving the problems of poor test consistency and limited functionality in existing technologies, improving test accuracy and data comparability, and enhancing overall test efficiency to meet batch testing needs. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall basic performance testing system for pressure sensors according to the present invention from one angle. Figure 2 This is a schematic diagram of the internal structure of a pressure sensor element integrated basic performance testing system according to the present invention; Figure 3 A cross-sectional structural schematic diagram of an embodiment of a refrigeration testing station; Figure 4 A cross-sectional structural schematic diagram of an embodiment of a heating test station; Figure 5 A cross-sectional structural schematic diagram of an embodiment of a displacement measurement station; Figure 6 This is a structural schematic diagram of an angle at a displacement measurement station.

[0020] Explanation of icon numbers: 10. Outer shell; 11. Safety door; 111. Visible protective window; 21. High-pressure gas cylinder; 31. Gas pipe; 321. Motor; 322. Reducer; 323. Pressure regulating valve; 41. High-pressure gas switch; 42. Branch valve; 43. Emergency stop control device; 50. Refrigeration test station; 51. Refrigeration component; 52. First connector; 53. First fixing fixture; 54. First protective cover; 60. Heating test station; 61. Heating component; 62. Second connector; 63. Second fixing fixture; 64. Second protective cover; 65. Insulation cover; 70. Displacement measurement station; 71. Displacement transmission component; 72. Displacement sensor; 73. Exhaust port; 80. Touch screen display module; 90. Refrigeration unit; 100. Pressure sensor element to be tested.

[0021] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0023] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0024] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0025] This invention proposes a comprehensive basic performance testing system for pressure sensors.

[0026] In embodiments of the present invention, such as Figures 1 to 6 As shown, the pressure sensor comprehensive basic performance testing system includes: a pressure device; a gas path device, the gas path device including a gas guide pipe 31, a pressure regulating device disposed on the gas guide pipe 31, and a gas flow distribution component, the gas guide pipe 31 being connected to the pressure device; multiple test stations, including at least a cooling test station 50, a heating test station 60, and a displacement measurement station 70, each of the test stations being connected to the gas guide pipe 31 via the gas flow distribution component; wherein each of the test stations includes a mounting cavity for accommodating the pressure sensor, a pressure action structure communicating with the mounting cavity, and a signal acquisition interface connected to the pressure sensor. The pressure-acting structure is used to introduce the air pressure output by the pneumatic device into the mounting cavity to apply pressure to the pressure sensor element; the cooling test station 50 is provided with a cooling component 51 for adjusting the temperature of the mounting cavity, the heating test station 60 is provided with a heating component 61 for adjusting the temperature of the mounting cavity, and the displacement measurement station 70 is provided with a displacement transmission component 71 that is connected to the pressure deformation part of the pressure sensor element and a displacement sensor 72 connected to the displacement transmission component 71; the airflow distribution component is used to perform branch control of the air pressure on / off and pressure magnitude of each test station to realize independent control or synchronous testing of multiple test stations.

[0027] In this embodiment, the air pressure device serves as the system's pressure source, providing a stable and adjustable air pressure to the air guide pipe 31. One end of the air guide pipe 31 is connected to the air pressure device, and the other end is connected to the cooling test station 50, the heating test station 60, and the displacement measurement station 70 via an airflow distribution component, thus forming a unified pressure supply and branch-controlled test architecture. Each test station has a mounting cavity to accommodate the pressure sensor 100 under test. After the mounting cavity is connected to the pressure application structure, the air pressure can directly act on the pressure-bearing part of the pressure sensor 100 under test through the pressure application structure, allowing the test piece to complete the test under a relatively consistent stress environment. The cooling component 51 in the cooling test station 50 is used to control the temperature of the mounting cavity to simulate low-temperature conditions; the heating component 61 in the heating test station 60 is used to control the temperature of the mounting cavity to simulate high-temperature conditions; the displacement transmission component 71 in the displacement measurement station 70 transmits the minute deformation of the pressure sensing element after being pressed to the displacement sensor 72 to achieve accurate detection of the deformation. Through the above assembly relationship, the system can realize multi-dimensional testing such as pressure-electrical signal, pressure-temperature, and pressure-displacement on the same platform, which not only avoids the problem of inconsistent force application in the traditional manual pressing method, but also improves the coverage of test parameters and the consistency of results, thereby improving the reliability and efficiency of the basic performance testing of ceramic pressure cores.

[0028] The displacement transmission component 71 transmits the minute deformation generated by the deformation-type pressure sensor element under pressure to the displacement sensor 72, which then converts the mechanical displacement into a recognizable electrical signal. Specifically, the displacement transmission component 71 includes a push rod and a sealing sleeve. The first end of the push rod abuts against the deformed portion of the deformation-type pressure sensor element, and the second end passes through the cavity wall of the mounting cavity and corresponds to the measuring end of the displacement sensor 72. The sealing sleeve is fitted around the outer periphery of the push rod and embedded in the through hole of the cavity wall of the mounting cavity to achieve an airtight seal between the push rod and the cavity wall. The sealing sleeve is preferably a rubber sealing sleeve or a bellows sealing sleeve, which allows the push rod to slide freely axially while ensuring airtightness. When air pressure acts on the deformation-type pressure sensor element, the deformation of the test piece is transmitted to the displacement sensor 72 through the push rod, thereby achieving synchronous acquisition of displacement changes. Simultaneously, the sealing sleeve ensures stable air pressure within the mounting cavity, preventing gas leakage from affecting the test results. This structure allows the system to establish a correspondence between pressure input and displacement output, which can then be used to analyze the deformation characteristics, sensitivity, and repeatability of the deformation-type pressure sensor, thereby improving the accuracy of displacement test results.

[0029] Furthermore, the pressure-applying structure is a pressurization hole formed in the wall of the mounting cavity. One end of the pressurization hole is connected to the air guide tube 31, and the other end leads into the interior of the mounting cavity, with the air outlet of the pressurization hole facing the pressure-deformed part of the deformable pressure sensor under test. Through this pressurization hole structure, the air pressure output by the pneumatic device can be directly and uniformly applied to the pressure-bearing surface of the deformable pressure sensor under test via the air guide tube 31 and the pressurization hole, thereby achieving pneumatic loading of the deformable pressure sensor. This structure is simple and reliable, avoids complex mechanical force application mechanisms, and easily achieves consistent pneumatic loading conditions in multiple test stations.

[0030] In addition, the pressure sensor integrated basic performance testing system is also equipped with a chiller 90 to provide cooling for the equipment and thus dissipate heat.

[0031] The present invention proposes a comprehensive basic performance testing system for pressure sensors, including a pressure device, a gas path device, and multiple test stations. The gas path device includes a gas guide pipe 31 and a pressure control device. The gas guide pipe 31 is connected to the pressure device. Each test station is connected to the gas guide pipe 31. The test stations include a cooling test station, a heating test station, and a displacement measuring device.

[0032] A unified air source is provided by a pneumatic device, and after being regulated by a pneumatic pressure regulator, the air is input to each test station. This ensures that the pressure sensor experiences a stable and consistent air pressure load during each test, thus replacing manual pressing and avoiding test errors caused by uneven force or inconsistent direction. Simultaneously, each test station, based on the same air circuit, implements low-temperature, high-temperature, and displacement measurement functions, ensuring that the pressure sensor is tested under uniform pressure conditions under different operating circumstances.

[0033] This allows for comprehensive testing of multiple parameters within the same system, effectively solving the problems of poor test consistency and limited functionality in existing technologies, improving test accuracy and data comparability, and enhancing overall test efficiency to meet batch testing needs.

[0034] Furthermore, such as Figure 1 As shown, the pressure device is a high-pressure gas cylinder 21, which is connected to the gas delivery pipe 31. In this embodiment, the pressure device uses the high-pressure gas cylinder 21 as the pressure source. The high-pressure gas cylinder 21 stores stable high-pressure gas. After the outlet of the high-pressure gas cylinder 21 is connected to the gas delivery pipe 31, it can provide a continuous and adjustable pressure source for the entire testing system. The high-pressure gas cylinder 21 is detachable, which facilitates the replacement of the gas source and maintenance of the equipment. It also facilitates the replacement of different specifications of gas cylinders according to different test pressure requirements. By using the high-pressure gas cylinder 21 as an independent pressure device, the system can establish test pressure in a short time and ensure the continuity and stability of pressure output, thereby meeting the pressure supply requirements of the pressure sensor in conventional measurement, temperature drift testing, and high-pressure limit testing.

[0035] Furthermore, such as Figure 2 As shown, the air pressure regulating device includes a motor 321, a reducer 322 driven by the motor 321, and a pressure regulating valve 323 connected to the reducer 322, used to regulate the air pressure in the air guide pipe 31. In this embodiment, the air pressure regulating device consists of a motor 321, a reducer 322, and a pressure regulating valve 323. The motor 321 serves as a power source, driving the reducer 322 to output a suitable adjustable speed and torque. The reducer 322 then drives the pressure regulating valve 323 to actuate, thereby changing the gas flow state and pressure in the air guide pipe 31. Through the cooperation of the motor 321 and the reducer 322, the pressure regulating valve 323 can achieve relatively fine opening adjustment, thus keeping the air pressure in the air guide pipe 31 within the target range. This transmission-type pressure regulation method can avoid fluctuations caused by manual pressure regulation, giving the output pressure better stability and repeatability, and is especially suitable for performance testing of ceramic pressure cores such as linearity, repeatability, and temperature drift.

[0036] Furthermore, such as Figure 1As shown, the pressure sensor integrated basic performance testing system also includes a housing 10. The air path device and each test station are all located inside the housing 10, while the air pressure device is located outside the housing 10 and connected to the air guide pipe 31. In this embodiment, the entire system is installed inside the housing 10, which encloses the air path device and each test station, thus forming a relatively independent test space. The air path device and each test station are fixedly located inside the housing 10, making the air pressure transmission path and test environment more stable. The air pressure device is located outside the housing 10, which facilitates the separation of the air supply device from the test chamber, reduces the occupation of the high-pressure air source in the operating space, and improves the convenience of air source maintenance and replacement. The air guide pipe 31 passes through the housing 10 and connects to the air path device inside the housing 10, allowing high-pressure gas to be safely introduced into the housing 10 without affecting the external operating environment. Through this structure, the test system places pressure loading, temperature control testing, and displacement measurement in a unified enclosed space, which helps to reduce the interference of the external environment on the test results and improves the overall safety and stability of the system.

[0037] In the parallel design, the outer casing 10 can be either an integral enclosed casing or a split frame casing, as long as it can effectively protect the gas circuit device and the test station.

[0038] Furthermore, such as Figure 2 As shown, the airflow distribution assembly includes a high-pressure gas switch 41, a branch valve 42, and an emergency stop control device 43 for controlling the on / off state of the airflow, all mounted on the air duct 31. In this embodiment, the airflow distribution assembly is integrally mounted on the air duct 31, and the high-pressure gas switch 41, branch valve 42, and emergency stop control device 43 are mounted on the housing 10 and form a fixed connection structure with the housing 10, so that each control component can be operated from outside the housing 10. Specifically, the air duct 31 is arranged along the inner side of the outer casing 10. The high-pressure gas switch 41 is connected to the air inlet end of the air duct 31 and installed near the operation panel of the outer casing 10, and is used to control the main switch of the high-pressure gas entering the system. Multiple branch valves 42 are provided, which are connected to each branch air path of the air duct 31 and are set for each test station, so as to independently adjust the air path opening and closing and pressure supply status of different test stations. The emergency stop control device 43 is located in an easily operable position on the outer casing 10 and is linked to the air path or control circuit of the air duct 31, and is used to quickly cut off all air paths when the system malfunctions, so as to prevent pressure from continuously entering the test station.

[0039] The above-mentioned branch control structure allows the refrigeration test station 50, the heating test station 60, and the displacement measurement station 70 to work independently or synchronously under unified control, thereby improving operational safety while ensuring testing flexibility.

[0040] Furthermore, such as Figure 1 As shown, the outer casing 10 is equipped with a safety door 11 for sealing the test station, and the safety door 11 is equipped with a viewing window 111. In this embodiment, the safety door 11 is provided on the outer casing 10 at the position corresponding to the test station. The safety door 11 is used to seal the test space inside the outer casing 10 before testing and to physically isolate the high-pressure area during testing. The safety door 11 cooperates with the opening edge of the outer casing 10, and when closed, it can completely cover the test station, thereby preventing operators from directly contacting the high-pressure gas action area and the explosion area of ​​the test component. Since there are actions such as air pressure loading, temperature change, and displacement measurement inside the test station, the setting of the safety door 11 can effectively prevent accidental contact and entry during testing, and improve the overall safety of the machine.

[0041] In the parallel scheme, the safety door 11 can be a single door, a double door, or a sliding door, as long as it can meet the sealing requirements of the test space.

[0042] Furthermore, a viewing window 111 is provided on the safety door 11. The viewing window 111 is located in the observation area of ​​the safety door 11, allowing operators to observe the internal testing status, the installation status of the test piece, and the workstation operation without opening the safety door 11. The viewing window 111, integrated with the safety door 11, meets observation requirements while maintaining the sealing and safety of the testing space. Since core bursting, sudden displacement changes, or abnormal temperature may occur during pressure testing, the viewing window 111 helps operators to promptly grasp the internal status, facilitating adjustments to test parameters or rapid shutdown measures, thereby improving the controllability of the testing process.

[0043] In the parallel solution, the viewing window 111 can be made of tempered glass, tempered transparent plastic or other high-strength transparent materials to balance observation and protection.

[0044] Furthermore, such as Figure 1 As shown, the pressure sensor integrated basic performance testing system also includes a touch screen display module 80 and a main control board, which are electrically connected to the touch screen display module 80 and each test station.

[0045] In this embodiment, the system also includes a touchscreen display module 80 and a main control board, with the main control board electrically connected to the touchscreen display module 80 and each test station. The touchscreen display module 80 displays parameters such as pressure, temperature, displacement, and test status, and also serves as an interface for users to set test conditions, switch test modes, and view test results. The main control board, as the system control core, coordinates and controls the air pressure regulation device, airflow distribution component, cooling component 51, heating component 61, and displacement measurement component, and collects data from each test station in real time. By integrating display and control functions, the system can achieve visualized and automated management of the test process, enabling test parameter setting, operation monitoring, and result viewing to be completed on the same interface, improving operational convenience and data processing efficiency.

[0046] In the parallel solution, the touch screen display module 80 and the main control board can be integrated into the same control box or installed separately, as long as they can achieve the operation and control functions.

[0047] Furthermore, such as Figures 1 to 3 As shown, the refrigeration test station 50 includes a first connector 52, a first fixing clamp 53, and a first protective cover 54. The first fixing clamp 53 is used to fix the pressure sensor element. The first connector 52 is installed on the first fixing clamp 53 and is used to fix the pressure sensor element 100 to be tested and to transmit electrical signals. The first protective cover 54 is placed on the first fixing clamp 53, and the refrigeration component 51 is disposed on the first protective cover 54. In this embodiment, the refrigeration test station 50 is composed of the first connector 52, the first fixing clamp 53, and the first protective cover 54, forming an integrated installation and temperature control test structure. Among them, the first fixing clamp 53 serves as the core load-bearing structure, used to position and clamp the pressure sensor element 100 to be tested, so that the pressure sensor element maintains a stable position in the installation cavity, ensuring that its pressure direction is consistent with the air pressure loading direction, thereby avoiding test errors caused by offset or shaking.

[0048] The first connector 52 is mounted on the first fixing clamp 53 and forms an electrical connection and structural fit with the pressure sensor. On one hand, the first connector 52 is used to assist in positioning or limiting the pressure sensor, further stabilizing it under clamping conditions; on the other hand, the first connector 52 is used to lead the electrical signal generated by the pressure sensor under pressure and low temperature environments to an external test circuit or main control board, thereby forming a stable signal transmission path. By integrating mechanical fixation and electrical signal transmission onto the same connector, independent wiring structures can be reduced, connection reliability can be improved, and the risk of poor contact in low temperature environments can be reduced.

[0049] The first protective cover 54 is installed outside the first fixing fixture 53, and together with the first fixing fixture 53, forms a relatively enclosed test space. The first protective cover 54 not only protects the internal structure, but also restricts the flow of outside air, thereby reducing the impact of environmental heat exchange on the test area.

[0050] The cooling component 51 is disposed on the first protective cover 54, and is preferably a cooling plate. The cooling energy generated by the cooling plate during operation is first transferred to the first protective cover 54, and then conducted and diffused from the first protective cover 54 into its internal space, thus forming a heat transfer path of "cooling plate - protective cover - mounting cavity - pressure sensor". This structure allows the cooling energy to be evenly distributed within the enclosed space, avoiding localized overcooling or excessive temperature gradients, thereby improving the stability and consistency of the low-temperature environment.

[0051] Through the above assembly relationship, the first fixing fixture 53 ensures the stable force state of the pressure sensor element, the first connector 52 ensures the continuity and reliability of the signal output, and the first protective cover 54 and the cooling component 51 work together to form a stable low temperature environment, so that the pressure sensor element can be tested under the combined action of air pressure and low temperature, thereby more accurately obtaining its performance parameters such as temperature drift and output stability, and improving the consistency and repeatability of test data.

[0052] In the parallel configuration, the cooling component 51 can be disposed not only on the first protective cover 54, but also on the first fixing clamp 53 or the wall of the mounting cavity to form a local cooling or composite cooling structure; the first connector 52 can adopt a plug-in type, electrode pressing type or elastic contact type structure to adapt to the electrical signal output mode of different types of pressure sensing elements.

[0053] Furthermore, such as Figure 1 , Figure 2 and Figure 4 As shown, the heating test station 60 includes a second connector 62, a second fixing clamp 63, and a second protective cover 64. The second fixing clamp 63 is used to fix the pressure sensor element. The second connector 62 is installed on the second fixing clamp 63 and is used to fix the pressure sensor element 100 to be tested and to transmit electrical signals. The second protective cover 64 is covered on the second fixing clamp 63, and the heating component 61 is disposed on the second protective cover 64.

[0054] In this embodiment, the structure of the heating test station 60 is basically the same as that of the cooling test station 50, also including a second connector 62, a second fixing clamp 63, and a second protective cover 64, for constructing another independent low-temperature test unit. The second fixing clamp 63 is used to clamp and position another pressure sensor element 100 under test, ensuring it maintains a stable stress state during air pressure loading to guarantee the comparability of test results.

[0055] The second connector 62 is mounted on the second fixing fixture 63 and forms an electrical connection and structural fit with the pressure sensor 100 under test. It is used to lead the electrical signal generated by the pressure sensor under pressure and high temperature environment to the test system, and at the same time, it plays an auxiliary role in fixing the pressure sensor. Through this structure, the second test station also has a stable signal acquisition capability, and the consistency of test data can be compared between different stations.

[0056] The second protective cover 64 is installed outside the second fixing clamp 63, together with the second fixing clamp 63, to form a closed test space. The heating component 61 is disposed on the second protective cover 64, and the heat it generates is conducted inward through the second protective cover 64, thereby creating a stable high-temperature environment within the second test station. This structure is consistent with the cooling test station 50, ensuring that different test stations have the same temperature control method, thereby improving the consistency of multi-station test results.

[0057] In addition, the heating test station 60 is also equipped with a heat insulation cover 65, which covers the outside of the second protective cover 64 and forms a double-layer covering structure with the second protective cover 64. The heat insulation cover 65 is used to insulate and seal the heating test area to reduce heat loss and reduce the interference of the external environment on the test temperature.

[0058] Furthermore, such as Figure 6 As shown, the displacement measurement station 70 is also provided with an exhaust port 73, which is used for pressure relief. In this embodiment, the displacement measurement station 70 is further provided with an exhaust port 73 on the basis of the original displacement detection structure. The exhaust port 73 is connected to the mounting cavity or the pressure-acting cavity of the displacement measurement station 70, and is preferably located on the side wall of the mounting cavity or at a position away from the pressure-bearing area of ​​the pressure sensor element being measured. Through this arrangement, the exhaust port 73 can achieve rapid release of gas in the cavity without affecting the pressure loading path and displacement measurement accuracy.

[0059] During routine displacement testing, the exhaust port 73 is closed to ensure stable air pressure inside the installation cavity, thereby ensuring good accuracy and repeatability of displacement measurement results. During burst testing, as the air pressure continues to rise, if the pressure sensor being measured ruptures or the system pressure rises abnormally, the exhaust port 73 can quickly open or passively release the internal high-pressure gas, thereby forming a pressure relief channel and causing the pressure inside the cavity to drop rapidly.

[0060] By setting an exhaust port 73 at the displacement measurement station 70, it is possible to prevent high-pressure gas from accumulating in the enclosed space during the explosion, reducing impact damage to the displacement sensor 72 and surrounding structures. Furthermore, it prevents uncontrollable scattering of pressure sensor fragments under the influence of high-pressure airflow, thereby improving the safety of the testing process. In addition, the exhaust port 73 allows for rapid depressurization of the cavity after the explosion test, facilitating quick reset for subsequent tests and improving overall testing efficiency.

[0061] Through the above structure, the displacement measurement station 70 can not only achieve accurate displacement detection, but also has a safe pressure relief function under blasting test conditions, thereby expanding the applicability of the test system.

[0062] In the parallel scheme, the exhaust port 73 can be set as a pressure relief port with a one-way valve structure, or it can be linked with an electronically controlled valve to open, or it can be used in conjunction with a pressure threshold triggering mechanism to achieve automatic pressure relief, as long as it can achieve rapid pressure relief under abnormal high pressure or explosion conditions.

[0063] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A comprehensive basic performance testing system for pressure sensors, characterized in that, include: Pneumatic device; An air path device, comprising an air guide pipe, an air pressure regulating device disposed on the air guide pipe, and an airflow distribution assembly, wherein the air guide pipe is connected to the air pressure regulating device; Multiple test stations, including at least a cooling test station, a heating test station, and a displacement measurement station, each of which is connected to the air duct via the airflow distribution component; Each of the test stations includes a mounting cavity for accommodating a pressure sensor, a pressure-acting structure communicating with the mounting cavity, and a signal acquisition interface connected to the pressure sensor. The pressure-acting structure is used to introduce the air pressure output by the pneumatic device into the mounting cavity to apply pressure to the pressure sensor. The cooling test station is equipped with a cooling component for adjusting the temperature of the mounting cavity, the heating test station is equipped with a heating component for adjusting the temperature of the mounting cavity, and the displacement measurement station is equipped with a displacement transmission component that is connected to the pressure deformation part of the pressure sensor and a displacement sensor connected to the displacement transmission component. The airflow distribution component is used to control the air pressure on / off and pressure magnitude of each test station separately, so as to realize independent control or synchronous testing of multiple test stations.

2. The pressure sensor element comprehensive basic performance testing system as described in claim 1, characterized in that, The air pressure device is a high-pressure gas cylinder, and the high-pressure gas cylinder is connected to the air delivery pipe.

3. The pressure sensor element comprehensive basic performance testing system as described in claim 1, characterized in that, The air pressure regulating device includes a motor, a reducer connected to the motor, and a pressure regulating valve connected to the reducer, used to regulate the air pressure in the air guide pipe.

4. The pressure sensor element comprehensive basic performance testing system as described in claim 1, characterized in that, The pressure sensor integrated basic performance testing system also includes a housing, the air circuit device and each test station are all set inside the housing, and the air pressure device is set outside the housing and connected to the air guide pipe.

5. The pressure sensor element comprehensive basic performance testing system as described in claim 4, characterized in that, The airflow distribution assembly includes a high-pressure gas switch, a branch valve, and an emergency stop control device for controlling the opening and closing of the airflow path, all mounted on the air duct.

6. The pressure sensor element comprehensive basic performance testing system as described in claim 4, characterized in that, The outer casing is equipped with a safety door for sealing the test station, and the safety door is equipped with a visible protective window.

7. The pressure sensor element comprehensive basic performance testing system as described in claim 4, characterized in that, The pressure sensor integrated basic performance testing system also includes a touch screen display module and a main control board, with the main control board electrically connected to the touch screen display module and each test station.

8. The pressure sensor element comprehensive basic performance testing system as described in claim 1, characterized in that, The refrigeration test station includes a first connector, a first fixing fixture, and a first protective cover. The first fixing fixture is used to fix the pressure sensor element. The first connector is installed on the first fixing fixture and is used to fix the pressure sensor element to be tested and to transmit electrical signals. The first protective cover is placed on the first fixing fixture, and the refrigeration component is placed on the first protective cover.

9. The pressure sensor element comprehensive basic performance testing system as described in claim 1, characterized in that, The heating test station includes a second connector, a second fixing clamp, and a second protective cover. The second fixing clamp is used to fix the pressure sensor element. The second connector is installed on the second fixing clamp and is used to fix the pressure sensor element to be tested and to transmit electrical signals. The second protective cover is placed on the second fixing clamp, and the heating component is placed on the second protective cover.

10. The pressure sensor element comprehensive basic performance testing system as described in claim 1, characterized in that, The displacement measurement station is also equipped with an exhaust port, which is used for pressure relief.

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