High-pressure sensor sealing test system and dynamic verification method thereof

Abstract

The invention belongs to the technical field of high-pressure sensor testing, and particularly relates to a high-pressure sensor sealing test system and a dynamic verification method thereof, and the system comprises a pressure input adjustment system, a pressure conduction sealing mechanism, a pressure monitoring sensor, a sealing test platform, and a data acquisition and analysis device. The pressure conduction sealing mechanism comprises a three-way conduction block, a first interface connecting pipe and a second interface connecting pipe; the pressure monitoring sensor is mounted at a sensor assembly port at the upper part of the three-way conduction block at the plug; the sealing test platform is provided with a cross pressure conduction channel and a multipath vertical pressure conduction output interface assembly communicated with the cross pressure conduction channel. The device is ideal in sealing effect, high in testing efficiency, high in stability and accurate in precision.

Description

Technical Field

[0001] The present invention belongs to the field of high-pressure sensor testing technology, specifically a high-pressure sensor seal testing system and its dynamic verification method. The system is applicable to liquid media above 60MPa and can solve the problems of high-pressure seal failure and insufficient test accuracy. Background Art

[0002] Current pressure testing systems are mostly designed for testing pressure sensors below 40 MPa. However, testing systems for liquid pressure sensors above 60 MPa often suffer from leakage issues in practical applications, resulting in limited high-pressure testing applications and significant difficulty in implementation. Leakage is a major malfunction during testing, and there are many reasons for this. Especially for high-pressure liquids, leaks can not only contaminate the equipment and affect its usability, but also disrupt testing and delay progress. Currently, most systems utilize rubber rings for sealing. However, when subjected to repeated pressure from high-pressure liquids over long periods of time, the rubber ring seal structure cannot meet the requirements for proper sealing pressure testing if external conditions prohibit frequent replacement. Under high-pressure conditions, the rubber ring can tear and damage, leading to test aborts. Furthermore, the test equipment must be easy to install, with easily removable wearing parts, while avoiding the time and equipment costs associated with repeated replacement of sealing components. Furthermore, high-precision pressure sensor testing requires relatively high requirements, with minimal pressure loss during pressure transmission, requiring an accurate and stable pressure testing environment. Existing testing environments experience significant pressure fluctuations, with pressure oscillations exceeding 1% during step loading. Summary of the Invention

[0003] The present invention aims to overcome the shortcomings of the prior art and provide a high-pressure sensor sealing test system and a dynamic verification method thereof. The main purpose is to solve the problems of the prior art such as unsatisfactory sealing effect, low test efficiency, poor stability and poor accuracy.

[0004] To solve the above-mentioned technical problems, the present invention is achieved as follows: A high-pressure sensor sealing test system, comprising: Pressure input regulation system: used to provide stable liquid pressure above 60MPa; The pressure transmission sealing mechanism includes a three-way transmission block, a first interface connecting pipe, and a second interface connecting pipe; one end of the first interface connecting pipe is connected to the pressure transmission outlet of the pressure input regulation system, and the other end thereof is connected to the pressure transmission inlet of the three-way transmission block; one end of the second interface connecting pipe is connected to the pressure transmission outlet of the three-way transmission block, and the other end is connected to the sealing test platform; Pressure monitoring sensor: The sensor assembly port is installed on the upper part of the three-way conductive block through the plug to monitor the pressure changes in real time and feed back to the control system; Sealing test platform: equipped with a cross pressure conduction channel and a multi-channel vertical pressure conduction output interface assembly communicating therewith; the pressure sensor under test is connected to the vertical pressure conduction output interface assembly via the pressure interface; the inlet of the cross pressure conduction channel is connected to the other end of the second interface connecting pipe; Data acquisition and analysis equipment: Calculate sensor performance indicators through data acquisition card and least squares analysis software.

[0005] Furthermore, the pressure input regulation system includes a piston pressure gauge, a booster and a weight block device; the data drive port of the piston pressure gauge is connected to the data transmission port of the weight block device; the hydraulic medium transmission port of the weight block device is connected to the second hydraulic medium port of the tee block in the booster via a second pipeline; the data detection port of the piston pressure gauge is connected to the data transmission port of the manual drive cylinder in the booster; the hydraulic medium transmission port of the manual drive cylinder in the booster is connected to the first hydraulic medium port of the tee block in the booster via a first pipeline; the third hydraulic medium port of the tee block outputs standard pressure.

[0006] Furthermore, the ends of the first interface connecting pipe and the second interface connecting pipe both adopt a conical structure; the pressure conduction inlet and the pressure conduction outlet of the three-way conduction block corresponding to the end positions of the first interface connecting pipe and the second interface connecting pipe both adopt a conical structure to achieve a two-way cone angle seal of the hydraulic medium at the connection part.

[0007] Furthermore, the other port of the first interface connecting pipe is connected to the pressure conduction inlet of the three-way conduction block through a pressure cap and a reverse fixed baffle ring in sequence; one port of the second interface connecting pipe is connected to the pressure conduction outlet of the three-way conduction block through a pressure cap and a reverse fixed baffle ring in sequence.

[0008] Furthermore, the vertical pressure conduction output interface assembly includes an output pressure cap, an output tube, a connecting nut, a fixed block and a sealing copper ring in sequence; a grooved O-ring is provided between the pressure interface of the pressure sensor to be measured and the upper end of the output tube, and the output pressure cap is used to achieve mutual fixed docking between the pressure sensor to be measured and the upper end of the output tube; the fixed block is sleeved on the lower end of the output tube, and the output tube is fixedly connected to the test platform through the connecting nut and the sealing copper ring.

[0009] Furthermore, the ends of the first interface connecting tube and the second interface connecting tube both adopt a 74° conical structure, forming a contact length greater than 3 mm with the tee conduction block, and the tee conduction block, the first interface connecting tube and the second interface connecting tube are made of stainless steel of different soft and hard materials; the surface roughness Ra ≥ 1.6 μm; the reverse fixed retaining ring adopts a left-handed thread structure; the outer diameter of the grooved O-ring is 0.5 mm larger than the outer diameter of the corresponding output conduit slot.

[0010] Furthermore, the pressure sensor under test includes a pressure interface, an insulating pad, a circuit board, an output line, a connector and a pressure core; the circuit board is fixedly connected to the pressure interface through the insulating pad; the pressure core is fixedly arranged in the pressure interface cavity; the data transmission interface of the circuit board is connected to the data transmission interface of the connector through the output line.

[0011] The dynamic verification method of the high-pressure sensor sealing test system comprises the following steps: Step S1: Pressure-stage loading a. When the target pressure is ≤60MPa, close the first pipeline and the piston pressure gauge drives the weight block device to output pressure; b. When the target pressure is greater than 60MPa, open the first pipeline and manually drive the oil cylinder to replenish the pressure so that the three-way block outputs the standard pressure; c. Increase the pressure to the target pressure in steps of 10% of the range, and maintain the pressure for 30 seconds at each step; Step S2: Real-time verification of sealing a. Maintain the target pressure for 5 minutes, and record the pressure output fluctuation Δp through the pressure monitoring sensor and the pressure sensor under test; b. If Δp / target pressure ≤ 0.05%, the seal is considered qualified; Step S3: Performance parameter calculation a. Collect the output voltage V of the pressure sensor under test and use the least squares method to fit a quadratic curve: V = a0 + a1P + a2P². P is the input pressure of the pressure sensor under test; a0, a1, and a2 are the coefficients to be calculated; V is the output voltage of the pressure sensor under test; ΔV is the change in the output voltage of the pressure sensor under test; and ΔP is the change in the input pressure of the pressure sensor under test. b. Calculate sensitivity S = ΔV / ΔP and linearity L = max|V-a1P| / full scale × 100%.

[0012] Furthermore, in step b of step S2, a dual-channel comparison is adopted: channel A: the pressure sensor under test outputs the pressure value p1; channel B: the pressure monitoring sensor outputs the pressure value p2; if |p1-p2| continues to increase and the rate of change is greater than 0.1 MPa / s, it is determined that the seal has failed.

[0013] The present invention can effectively test the pressure sensor under the pressure of the liquid medium above 60MPa. Through the pressure supply of the device system, the effective transmission of the pressure conduction system, the output of the test platform and the structural design of the sensor, leakage is prevented, pressure loss is reduced, and the sealing effect of the test device under high pressure is guaranteed. It provides a more accurate pressure input, improves the pressure transmission accuracy, ensures the accuracy of the test system, and provides accurate support for high-precision pressure testing. The sealing test platform is provided with a cross pressure conduction channel and a multi-channel vertical pressure conduction output interface assembly connected thereto. It adopts a fixed seal of a sealing copper ring and a detachable and better grooved O-ring to achieve double sealing. The pressure sensor to be tested includes a pressure core, a double-layer threaded pressure cap structure and an electron beam welding seal, and can withstand high pressures above 60MPa.

[0014] BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be described in detail below through specific examples. These examples are provided in order to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art. As mentioned throughout the specification and claims, "including" or "comprising" is an open-ended term and is interpreted as "including but not limited to". The subsequent description of the specification is a preferred embodiment of the present invention, but the description is based on the general principles of the specification and is not intended to limit the scope of the present invention. The scope of protection of the present invention shall be determined by the appended claims.

[0016] Figure 1 Schematic diagram of the overall structure of the system of the present invention; Figure 2 For the present invention Figure 1 A top view of Figure 3 This is a schematic structural diagram of the pressure transmission sealing mechanism of the present invention; Figure 4 This is a structural diagram of the sealing test platform of the present invention; Figure 5 Schematic diagram of the structure of the pressure sensor under test of the present invention; Figure 6 The working principle of the pressure input regulation subsystem of the present invention; Figure 7 This is a flow chart of the dynamic verification method of the present invention.

[0017] Figure: 1, pressure input adjustment system, 101, piston pressure gauge; 102, weight block device; 103, booster; 4, pressure transmission sealing mechanism; 5, pressure monitoring sensor; 6, sealing test platform; 7, measured pressure sensor; 801, first interface connecting pipe; 802, second interface connecting pipe; 9, pressure cap; 10, reverse fixed retaining ring; 11, plug; 12, three-way transmission block; 13, test platform; 1301, cross pressure transmission Guide channel; 1302, vertical pressure conduction output interface assembly; 14, sealing copper ring; 15, fixed block; 16, connecting nut; 17, output conduit; 18, output pressure cap; 19, grooved O-ring; 20, sealing plug; 21, sealing plug; 22, pressure interface; 23, screw; 24, threaded pressure cap; 25, insulating pad; 26, circuit board; 27, outlet wire; 28, connector; 29, glue potting; 30, pressure core; 31, shell. DETAILED DESCRIPTION

[0018] like Figure 1 、 2 As shown, the high pressure sensor sealing test system includes: Pressure input regulation system 1: used to provide stable liquid pressure above 60MPa; Pressure transmission sealing mechanism 4: includes a three-way transmission block 12, a first interface connecting tube 801, and a second interface connecting tube 802; one end of the first interface connecting tube 801 communicates with the pressure transmission outlet of the pressure input regulation system 1, and the other end thereof communicates with the pressure transmission inlet of the three-way transmission block 12; one end of the second interface connecting tube 802 communicates with the pressure transmission outlet of the three-way transmission block 12; Pressure monitoring sensor 5: A sensor assembly port installed on the upper part of the three-way conductive block 12 through the plug 11 to monitor pressure changes in real time and feed back to the control system; Sealing test platform 6: equipped with a cross pressure conduction channel 1301 and a multi-way vertical pressure conduction output interface assembly 1302 communicating therewith; the pressure sensor 7 under test is connected to the vertical pressure conduction output interface assembly 1302 via the pressure interface 22; the inlet of the cross pressure conduction channel 1301 is connected to the other end of the second interface connecting pipe 802; Data acquisition and analysis equipment: Calculate sensor performance indicators through data acquisition card and least squares analysis software.

[0019] See also Figure 1 、 2As shown in Figure 6, the pressure input regulation system 1 includes a piston pressure gauge 101, a booster 103 and a weight block device 102; the data drive port of the piston pressure gauge 101 is connected to the data transmission port of the weight block device 102; the hydraulic medium transmission port of the weight block device 102 is connected to the second hydraulic medium port of the three-way block in the booster 103 via a second pipeline; the data detection port of the piston pressure gauge 101 is connected to the data transmission port of the manual drive cylinder in the booster 103; the hydraulic medium transmission port of the manual drive cylinder in the booster 103 is connected to the first hydraulic medium port of the three-way block in the booster 103 via a first pipeline; the third hydraulic medium port of the three-way block outputs the standard pressure.

[0020] See also Figure 3 As shown, the ends of the first interface connecting pipe 801 and the second interface connecting pipe 802 both adopt a conical structure; the pressure conduction inlet and the pressure conduction outlet of the three-way conduction block 12 corresponding to the end positions of the first interface connecting pipe 801 and the second interface connecting pipe 802 both adopt a conical structure to achieve a two-way cone angle seal of the hydraulic medium at the connection part.

[0021] See also Figure 3 As shown, the other port of the first interface connecting tube 801 is connected to the pressure conduction inlet of the three-way conduction block 12 through the pressure cap 9 and the reverse fixed baffle ring 10 in sequence; one port of the second interface connecting tube 802 is connected to the pressure conduction outlet of the three-way conduction block 12 through the pressure cap 9 and the reverse fixed baffle ring 10 in sequence.

[0022] See also Figure 2 、 4 As shown, the vertical pressure conduction output interface assembly 1302 includes an output pressure cap 18, an output conduit 17, a connecting nut 16, a fixed block 15 and a sealing copper ring 14 in sequence; a grooved O-ring 19 is provided between the pressure interface 22 of the measured pressure sensor 7 and the upper end of the output conduit 17, and the output pressure cap 18 is used to achieve mutual fixed docking between the measured pressure sensor 7 and the upper end of the output conduit 17; the fixed block 15 and the sealing copper ring 14 are respectively connected to the lower end of the output conduit 17, and the connecting nut 16 is used to achieve fixed connection between the output conduit 17 and the test platform 13.

[0023] See also Figure 3 As shown, the ends of the first interface connecting tube 801 and the second interface connecting tube 802 both adopt a 74° tapered structure, forming a contact length greater than 3mm with the three-way conductive block 12; the surface roughness Ra is ≤ 1.6μm; the reverse fixed ring 10 adopts a left-hand thread structure; the outer diameter of the grooved O-ring is 0.5mm larger than the outer diameter of the corresponding groove of the output conduit 17. Figure 4As shown, the sealing copper ring 14 is compressed by the connecting nut 16 to produce a micro-deformation seal; the sealing copper ring 14 is fixed after installation and sealing, and the grooved O-ring 19 connected to the measured pressure sensor 7 can be removed and replaced.

[0024] See also Figure 5 As shown, the measured pressure sensor 7 includes a pressure interface 22, an insulating gasket 25, a circuit board 26, an outlet line 27, a connector 28 and a pressure core 30; the circuit board 26 is fixedly connected to the pressure interface 22 through the insulating gasket 25; the pressure core 30 is fixedly arranged in the cavity of the pressure interface 22; the data transmission interface of the circuit board 26 is connected to the data transmission interface of the connector 28 via the outlet line 27.

[0025] See also Figure 7 As shown, the dynamic verification method of the high-pressure sensor sealing test system includes the following steps: Step S1: Pressure-stage loading a. When the target pressure is ≤60MPa, the first pipeline is closed, and the piston pressure gauge 101 drives the weight block device 102 to output the pressure; b. When the target pressure is greater than 60MPa, open the first pipeline and manually drive the oil cylinder to replenish the pressure so that the three-way block outputs the standard pressure; c. Increase the pressure to the target pressure in steps of 10% of the range, and maintain the pressure for 30 seconds at each step; Step S2: Real-time verification of sealing a. Maintain pressure at the target pressure for 5 minutes, and record the pressure output fluctuation Δp through the pressure monitoring sensor 5 and the measured pressure sensor 7; b. If Δp / target pressure ≤ 0.05%, the seal is considered qualified; Step S3: Performance parameter calculation a. Collect the output voltage V of the pressure sensor 7 under test and fit a quadratic curve V=a0+a1P+a2P² using the least squares method. P is the input pressure of the pressure sensor 7 under test; a0, a1, and a2 are the coefficients to be calculated; V is the output voltage of the pressure sensor 7 under test; ΔV is the change in the output voltage of the pressure sensor 7 under test; and ΔP is the change in the input pressure of the pressure sensor 7 under test. b. Calculate sensitivity S = ΔV / ΔP and linearity L = max|V-a1P| / full scale × 100%.

[0026] The high-pressure sensor sealing test system of the present invention comprises: a pressure input regulating system 1, a pressure transmission sealing mechanism 4, a sealing test platform 6, a pressure sensor to be tested 7, a data acquisition and analysis device and the like.

[0027] The pressure input regulation system 1 includes a piston pressure gauge 101, a booster 103, and a weight block device 102, which mainly provides a stable and reliable test pressure for the high-pressure sensor sealing test system of the present invention. The present invention uses the piston pressure gauge 101 to automatically drive the weight block device 102 for balance, thereby forming a stable hydraulic pressure. The maximum pressure of the piston pressure gauge 101 is 60MPa. When it is greater than 60MPa, the boosting capacity of the booster 103 is used to provide a large pressure output for the pipeline cavity, ensuring that the system can provide an output of a test pressure greater than 60MPa. The outlet of the piston pressure gauge 101 is connected to the booster 103, and the booster 103 is connected to the weight block device 102. The pipeline converges the tee block of the booster 103, and the standard test pressure is output from the upper outlet of the booster 103. See Figure 6 As shown, the booster 103 is provided with a brake handle and a valve. An oil cylinder is provided inside the booster 103. The brake handle drives the oil cylinder to move, providing boosting capacity for the booster 103. The valve is provided at the outlet of the manual drive oil cylinder. When the pressure is less than 60 MPa, it is in a closed state, and when the pressure is greater than 60 MPa, it is connected. The pressure transmission and sealing mechanism 4 comprises a three-way transmission block 12, an interface connecting pipe, a pressure cap 9, a reverse fixed retaining ring 10, and a plug 11. This pressure transmission and sealing mechanism 4 connects the pressure output of the supercharger 103 to the sealing test platform 6. Due to the long distance between the connecting devices, an intermediate connecting three-way transmission block 12 is required for transfer. The sealing structure uses a metal conical surface to tightly compress, creating a high-pressure seal in the connecting pipeline and ensuring effective output of hydraulic pressure. To ensure the tight compression of the conical surface, a reverse fixed retaining ring 10 is installed in the pipeline connection line. The blocking of the reverse fixed retaining ring 10 and the tightening of the pressure cap 9 ensure the integrity and fixation of the sealing structure, achieving its high-pressure sealing performance.

[0028] The pressure monitoring sensor 5 is a high-precision pressure sensor that monitors pressure changes in the test chamber in real time and transmits the data to the control system for timely data analysis and pressure adjustment. The measurement range and accuracy of the pressure monitoring sensor 5 should be appropriately selected based on the test requirements.

[0029] See also Figure 2 、 4As shown, the sealing test platform 6 includes a test platform 13, an output conduit 17, a connecting nut 16, a sealing copper ring 14, a fixed block 15, an output pressure cap 18, a grooved O-ring 19, a sealing plug 20, and a sealing plug 21. The sealing test platform 6 is connected to the pressure transmission sealing mechanism 4, introducing pressure into the test platform 13. Through structural design, the cavity of the test platform 13 forms a nine-way vertical pipeline interface to output pressure, which is connected to the pressure sensor 7 under test for testing. The sealing part is divided into three parts: the pressure interface introduction is sealed by a conical sealing surface compression method; the vertical direction output part of the nine-way interface adopts the reverse compression method of the sealing copper ring 14 to provide a fixed seal; the test connection of the pressure sensor 7 under test adopts a high-hardness grooved O-ring with a replaceable seal method; the platform process hole adopts a threaded tightening and then welding method to ensure high-pressure sealing and strength.

[0030] The pressure sensor 7 under test comprises a pressure port 22, a screw 23, a threaded cap 24, an insulating gasket 25, a circuit board 26, a lead 27, a connector 28, a potting compound 29, a pressure core 30, and a housing 31. The pressure sensor 7 under test measures pressure exceeding 60 MPa. The chip in the pressure core 30 senses the cavity pressure and collects pressure. The collected pressure signal is then converted into the desired output signal through an external circuit. From the perspective of structural design, the structural strength and stability of the ultra-high pressure liquid transmission process are guaranteed by tightening the two layers of threads of the pressure core 30 and the threaded pressure cap 24. The sealing of the high-pressure liquid is guaranteed by welding the pressure core 30, and the strength of the overall structure is increased by working together with the double-layer threads. The pressure interface 22 is connected to the sealing test platform 6 to introduce the cavity pressure into the pressure core 30. The output line 27 is partially connected to the circuit board 26. The weak electrical signal output by the pressure core 30 is processed by the compensation circuit, analog-to-digital conversion, and amplification circuit, and converted into a voltage value suitable for reading and analysis by the test instrument, and is exported through the output line 27 and the connector 28. The insulating pad 25 isolates the threaded pressure cap 24 and the circuit board 26 to play an insulating role. The double-layer circuit board 26 is fixed to the pressure interface 22 by screws 23.

[0031] Data acquisition and analysis equipment uses high-precision data acquisition cards and data analysis software to collect sensor output signals and test parameters in real time, analyze and process them, and calculate various sensor performance indicators such as sensitivity, accuracy, and linearity. The data analysis software has functions such as data storage, graphing, and report generation, making it easy for operators to record and analyze test results.

[0032] In the specific design of the present invention, the high-pressure sensor sealing test system includes: a pressure input regulation system 1, a pressure transmission sealing mechanism 4, a pressure monitoring sensor 5, a sealing test platform 6, a pressure sensor to be tested 7 and data acquisition and analysis equipment.

[0033] The piston pressure gauge 101 and the weight block device 102 can provide a test pressure lower than 60MPa; when the pressure exceeds 60MPa, the booster 103 needs to be started; the first pipeline of the booster 103 is connected to the piston pressure gauge 101 to provide pressure oil to the oil cylinder of the booster 103, and the second pipeline is connected to the T-block of the booster 103 and the weight block device 102 to provide a pressure lower than 60MPa. The two hydraulic pipelines converge in the T-block of the booster 103 and output the standard test pressure from the upper outlet of the booster 103. The piston pressure gauge 101 is connected to the weight block device 102 via a data cable. When the set pressure is less than 60MPa, the first pipeline at the intensifier 103 end is closed, and the piston pressure gauge 101 directly drives the weight block device 102 to provide test pressure liquid. The test pressure is then output from the upper outlet of the intensifier 103 through the tee block. When the set pressure exceeds 60MPa, exceeding the pressure range provided by the piston pressure gauge 101, the first pipeline of the intensifier 103 is opened through a valve, and the brake handle is manually actuated to drive the manual drive cylinder to provide pressure liquid. This, together with the second pipeline, drives the weight block device 102 to balance the pressure, providing a total pressure exceeding 60MPa, and outputs the standard test pressure liquid from the upper outlet of the intensifier 103. The connection interface between the first and second pipelines uses a conical surface seal, which is achieved by tightening the pressure cap.

[0034] The pressure transmission sealing mechanism 4 includes a three-way transmission block 12, an interface connection pipe (see Figure 3, the first interface connecting tube 801, the second interface connecting tube 802), the pressure cap 9, the reverse fixed baffle ring 10, and the plug 11. The three-way conduction block 12 is set when the liquid pressure transmission distance exceeds 500mm. The two horizontal ends of the three-way conduction block 12 are opened and connected, which are the inlet and outlet respectively. The inlet and outlet sealing forms are 74° conical sealing ports, and the surface roughness is required to be greater than 1.6μm; the upper end of the three-way conduction block 12 in the vertical direction has a hole, which can be used to place the pressure monitoring sensor 5. On the three-way conduction block 12 where the pressure monitoring sensor 5 is not placed, the plug 11 is screwed in for sealing; the three tapered holes in the horizontal and vertical directions of the three-way conduction block 12 are provided with internal threads for tightening the pressure cap 9; the interface connecting pipe is a slender steel pipe with a 74° conical structure at both ends. Both ends are provided with left-hand threads for placing the reverse fixed baffle ring 10. When the pressure cap 9 is tightened, It plays a blocking role; the tapered length of the three-way conduction block 12 is smaller than the tapered length of the interface connecting pipe, and the tapered contact length is ensured to be greater than 3mm; the pressure cap 9 is in the form of a thread, with an inner hole opened at the end of the thread, the hole diameter is larger than the outer diameter of the fixed retaining ring 10, and a shoulder is provided to block the fixed retaining ring 10; the fixed retaining ring 10 adopts a left-handed design and is connected and fixed to the interface connecting pipe. The pressure cap 9 passes through the reverse fixed retaining ring 10 and is stuck at the shoulder, pressing the three-way conduction block 12 tightly. The left-handed thread design here effectively avoids the loosening of the reverse fixed retaining ring 10 after the pressure cap 9 is tightened, ensuring the close fit of the tapered mouth and playing a sealing role; the plug 11 is connected to the upper end of the three-way conduction block 12. When the pressure monitoring sensor 5 is not set, the plug 11 is used to block the upper end of the three-way conduction block 12 to ensure sealing. The interface connecting pipe and the three-way conduction block 12 are made of two stainless steels of different hardness to ensure the reliability of the hard seal.

[0035] The pressure monitoring module is equipped with a standard, high-precision pressure monitoring sensor 5 at the output end of the pressure-transmitting sealing mechanism 4, before connecting to the seal test platform 6. This sensor monitors changes in the liquid pressure within the pipeline chamber and transmits the data to the control system for timely analysis and adjustment. The measurement range and accuracy of the pressure monitoring sensor 5 should be appropriately selected based on the test pressure.

[0036] The sealing test platform 6 includes a test platform 13, an output conduit 17, a connecting nut 16, a sealing copper ring 14, a fixed block 15, an output pressure cap 18, a support, and a bolt plug. The sealing test platform 6 is a 260mmX260mm square platform with four cross-channels formed inside. Nine liquid pressure outlets are set in the vertical direction for connecting to the pressure sensor 7 to be tested. The pressure inlet adopts a conical compression sealing structure of the pressure transmission sealing connection mechanism 4. The four channels are opened inside the platform, and the end is sealed by argon arc welding after being tightened with a sealing plug 21. The material is consistent with the platform material. The nine vertical outlets adopt a hard sealing form. The bottom plane of the inner hole of the platform is grooved and a sealing copper ring 14 is set. The groove depth is less than the copper ring wire diameter. One end of the output conduit 17 is connected to the square platform, and the other end is connected to the pressure sensor 7 to be tested. The apertures of the output pressure cap 18 and the connecting nut 16 are both larger than the outer diameter of the output conduit 17. ; After the output pressure cap 18 and the connecting nut 16 are successively inserted into the output conduit 17, the fixed block 15 is connected to the output conduit 17 with a threaded connection for blocking; the sealing copper ring 14 is compressed by the connecting nut 16 and the inner hole of the square platform to achieve a sealed connection of the nine-way outlet; the test end of the interface with the measured pressure sensor 7 adopts a grooved O-ring 19 with a hardness greater than 90 butadiene material, the wire diameter is 3mm, the groove depth of the output conduit 17 for placing the grooved O-ring 19 is 2.5mm, and the outer diameter of the groove is 0.5mm smaller than the outer diameter of the grooved O-ring 19. The live nut output pressure cap 18 is compressed and sealed with the measured pressure sensor 7. The grooved O-ring 19 seal here can ensure high-pressure testing and is easy to disassemble and replaceable. The nine-way output interface of the sealing test platform of the present invention adopts layered sealing, wherein the first layer: the sealing copper ring 14 is compressed by the connecting nut to produce a micro-deformation seal; the second layer: the sealing ring (nitrile O-ring) with a hardness greater than 90 is embedded in a matching groove with a depth of 2.5mm and compressed by the output pressure cap 18. Specifically, in the first sealing, the pressure is introduced by the output conduit 17, which is tightened by the connecting nut 16 and the fixed block 15 to press the sealing copper ring 14 against the bottom plane of the nine holes of the test platform 13, and the sealing is achieved through the deformation of the sealing copper ring 14; the second sealing is formed by placing a grooved O-ring 19 on the upper end plane of the output conduit 17, which is connected to the pressure interface 22 of the pressure sensor 7 under test through the output pressure cap 18 to form an output seal. Finally, the pressure liquid is introduced into the pressure sensor 7 under test for testing.

[0037] The pressure sensor 7 under test includes a pressure interface 22, a pressure core 30, a threaded pressure cap 24, an insulating gasket 25, a circuit board 26, a housing 31, a connector 28, and a glue potting 29. The pressure core 30 for high-voltage testing in the pressure sensor 7 under test is selected based on performance indicators. The outer diameter of the pressure core 30 adopts a partially coarse thread structure and is threadedly connected to the pressure interface 22. The top surface of the pressure core 30 is flush with the threaded contact surface of the pressure interface 22, and electron beam welding is adopted to ensure sealing and high pressure requirements; the inner hole of the threaded pressure cap 24 is smaller than the outer diameter of the pressure core 30. The threaded pressure cap 24 is screwed into the pressure interface to compress the pressure core 30 and increase the strength of the high-voltage structure; the insulating gasket 25 is installed between the circuit board 26 and the threaded pressure cap 24, has a certain height, and plays an insulating role; the insulating gasket 25, The inner ring of the threaded pressure cap 24 is perforated to facilitate the wiring; three small threaded holes are opened around the pressure interface 22, and the circuit board 26 and the pressure interface 22 are tightened with insulated polytetrafluoroethylene screws to fix the circuit board 26 on the pressure interface 22; the circuit board 26 is equipped with a compensation resistor, an analog-to-digital conversion module, and an amplification circuit to process the electrical signal output by the pressure core 30, convert it into the voltage value required for reading and analysis by the test instrument, and lead it out through the transmission line and connector; the shell 31 is screwed into the pressure interface 22, and the colloid 29 is injected from the port of the connector 28 to play an insulating and isolating role; the connector 28 and the shell 31 are connected by screws.

[0038] Data acquisition and analysis equipment uses high-precision data acquisition cards and data analysis software to collect sensor output signals and parameters during the test in real time. The least squares method is often used to analyze and process the collected pressure signal data to calculate various sensor performance indicators such as sensitivity, accuracy, and linearity. The data analysis software should have functions such as data storage, graph drawing, and report generation to facilitate operators to record and analyze test results.

[0039] Data acquisition was performed on three 70MPa pressure transmitters, powered by 24V power and read via a 485 bus. A least squares table was used, with each pressure transmitter tested at a temperature of 25°C in an air-conditioned room. A high-pressure sensor seal test system was used to test the transmitter at an atmospheric pressure of 102.677 kPa. Three rounds of forward and reverse stroke tests were performed, and floating-point numbers were read to test static characteristics. The results are as follows:

[0040]

[0041]

[0042] Measured data

[0043] The content of the present invention is not limited to the embodiments listed. Any equivalent transformation of the technical solution of the present invention made by ordinary technicians in this field after reading the description of the present invention is covered by the claims of the present invention.

Claims

1. A high-pressure sensor sealing test system, characterized in that: include: Pressure input regulating system (1): used to provide a stable liquid pressure of more than 60MPa; A pressure transmission sealing mechanism (4): comprising a three-way transmission block (12), a first interface connection pipe (801) and a second interface connection pipe (802); one end of the first interface connection pipe (801) is in communication with the pressure transmission outlet of the pressure input regulation system (1), and the other end thereof is in communication with the pressure transmission inlet of the three-way transmission block (12); one end of the second interface connection pipe (802) is in communication with the pressure transmission outlet of the three-way transmission block (12); Pressure monitoring sensor (5): a sensor assembly port installed on the upper part of the three-way conductive block (12) through the plug (11) to monitor pressure changes in real time and feed back to the control system; The sealing test platform (6) is provided with a cross pressure conduction channel (1301) and a multi-channel vertical pressure conduction output interface component (1302) communicating therewith; the pressure sensor (7) to be tested is connected to the vertical pressure conduction output interface component (1302) via the pressure interface (22); the inlet of the cross pressure conduction channel (1301) is connected to the other end of the second interface connecting pipe (802); Data acquisition and analysis equipment: Calculate sensor performance indicators through data acquisition card and least squares analysis software.

2. The high-pressure sensor sealing test system according to claim 1, characterized in that: The pressure input regulating system (1) comprises a piston pressure gauge (101), a booster (103) and a weight block device (102); the data drive port of the piston pressure gauge (101) is connected to the data transmission port of the weight block device (102); the hydraulic medium transmission port of the weight block device (102) is communicated with the second hydraulic medium port of the three-way block in the booster (103) via a second pipeline; the data detection port of the piston pressure gauge (101) is connected to the data transmission port of the manual drive cylinder in the booster (103); the hydraulic medium transmission port of the manual drive cylinder in the booster (103) is communicated with the first hydraulic medium port of the three-way block in the booster (103) via a first pipeline; and the third hydraulic medium port of the three-way block outputs a standard pressure.

3. The high-pressure sensor sealing test system according to claim 1, characterized in that: The ends of the first interface connecting pipe (801) and the second interface connecting pipe (802) both adopt a conical structure; the pressure conduction inlet and the pressure conduction outlet of the three-way conduction block (12) corresponding to the end positions of the first interface connecting pipe (801) and the second interface connecting pipe (802) both adopt a conical structure to achieve a two-way cone angle hard seal of the hydraulic medium at the connection part.

4. The high-pressure sensor sealing test system according to claim 2, characterized in that: The other end of the first interface connecting tube (801) is communicated with the pressure conduction inlet of the three-way conduction block (12) through the pressure cap (9) and the reverse fixed baffle ring (10) in sequence; and one end of the second interface connecting tube (802) is communicated with the pressure conduction outlet of the three-way conduction block (12) through the pressure cap (9) and the reverse fixed baffle ring (10) in sequence.

5. The high-pressure sensor sealing test system according to claim 4, characterized in that: The vertical pressure conduction output interface assembly (1302) comprises an output pressure cap (18), an output conduit (17), a connecting nut (16), a fixed stopper (15) and a sealing copper ring (14) in sequence; a grooved O-ring (19) is provided between the pressure interface (22) of the pressure sensor (7) to be measured and the upper end of the output conduit (17), and the output pressure cap (18) is used to achieve the mutual fixed docking of the pressure sensor (7) to be measured and the upper end of the output conduit (17); the fixed stopper (15) is sleeved with the lower end of the output conduit (17), and the output conduit (17) is fixedly connected to the test platform (13) through the connecting nut (16) and the sealing copper ring (14).

6. The high-pressure sensor sealing test system according to claim 5, characterized in that: The ends of the first interface connecting tube (801) and the second interface connecting tube (802) both adopt a 74° conical structure, forming a contact length greater than 3 mm with the three-way conductive block (12), and the three-way conductive block (12) and the first interface connecting tube (801) and the second interface connecting tube (802) are made of stainless steel of different soft and hard materials; the surface roughness Ra ≥ 1.6 μm; the reverse fixed retaining ring (10) adopts a left-handed thread structure; the outer diameter of the grooved O-ring (19) is 0.5 mm larger than the outer diameter of the corresponding groove of the output conduit (17).

7. The high-pressure sensor sealing test system according to claim 6, characterized in that: The pressure sensor (7) under test comprises a pressure interface (22), an insulating pad (25), a circuit board (26), an outlet line (27), a connector (28) and a pressure core (30); the circuit board (26) is fixedly connected to the pressure interface (22) via the insulating pad (25); the pressure core (30) is fixedly arranged in the cavity of the pressure interface (22); the data transmission interface of the circuit board (26) is connected to the data transmission interface of the connector (28) via the outlet line (27).

8. A dynamic verification method using the high-pressure sensor sealing test system according to any one of claims 1 to 7, characterized in that: The steps include: Step S1: Pressure-stage loading a. When the target pressure is ≤60MPa, the first pipeline is closed, and the piston pressure gauge (101) drives the weight block device (102) to output pressure; b. When the target pressure is greater than 60MPa, open the first pipeline and manually drive the oil cylinder to replenish the pressure so that the three-way block outputs the standard pressure; c. Increase the pressure to the target pressure in steps of 10% of the range, and maintain the pressure for 30 seconds at each step; Step S2: Real-time verification of sealing a. Maintain the pressure at the target pressure for 5 minutes, and record the pressure output fluctuation Δp through the pressure monitoring sensor (5) and the measured pressure sensor (7); b. If Δp / target pressure ≤ 0.05%, the seal is considered qualified; Step S3: Performance parameter calculation a. Collect the output voltage V of the pressure sensor (7) under test, and fit a quadratic curve V=a0+a1P+a2P² by the least squares method; wherein P is the input pressure of the pressure sensor (7) under test; a0, a1 and a2 are coefficients to be calculated; V is the output voltage of the pressure sensor (7) under test; ΔV is the change in the output voltage of the pressure sensor (7) under test; and ΔP is the change in the input pressure of the pressure sensor (7) under test; b. Calculate sensitivity S = ΔV / ΔP and linearity L = max|V-a1P| / full scale × 100%.

9. The dynamic verification method of the high-pressure sensor sealing test system according to claim 8, characterized in that: In step b of step S2, a dual-channel comparison is used, channel A: the pressure sensor (7) under test outputs the pressure value p1; channel B: the pressure monitoring sensor (5) outputs the pressure value p2; if |p1-p2| continues to increase and the rate of change is greater than 0.1 MPa / s, it is determined that the seal has failed.

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