CN110702307A - Method for testing pressure parameters of multi-channel sensor - Google Patents
Method for testing pressure parameters of multi-channel sensor Download PDFInfo
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- G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
- G01L27/002—Calibrating, i.e. establishing true relation between transducer output value and value to be measured, zeroing, linearising or span error determination
- G01L27/005—Apparatus for calibrating pressure sensors
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Abstract
The invention provides a method for testing pressure parameters of a multi-channel sensor, and aims to provide a method for simultaneously pre-pressing and pressurizing a plurality of multi-channel pressure sensors. The invention is realized by the following technical scheme: preparing a flow-collecting frame platform connected with an external air source and a multi-channel pressure sensor, arranging an arrangement area for positioning a standard pressure generator test piece on the flow-collecting frame platform, arranging strip-shaped sealing ring positioning grooves according to a linear array on the arrangement area, and manufacturing a through hole for longitudinally communicating a pressure transmission channel and a pressure output adapter for vertically and upwardly positioning the standard pressure generator test piece by each strip-shaped sealing ring positioning groove; the pipeline of external detection air supply is connected with the filler neck, and the detection air supply enters the pressure output adapter through the pressure transmission channel of the flow-collecting frame platform, outputs different pressure values or empties the pipeline gas, completes the prepressing of the calibrated multichannel pressure sensor in the setting area, and simultaneously pressurizes, air tightness, input-output characteristics and multiple parameters.
Description
Technical Field
The invention relates to the field of testing of military aviation sensors, in particular to a prepressing and pressurizing device for a multi-channel pressure sensor.
Background
The pressure sensor is one of many sensors, and the pressure sensor usually adopts a silicon piezoresistive core body as a sensitive element, and utilizes the piezoresistive effect of semiconductor silicon to measure pressure so as to realize the conversion of differential pressure signals and electric signals. The pressure sensor is the most widely applied basic means and equipment in the industrial production process, measures and controls three parameters of pressure, temperature and flow, directly comes from the use and development of the gas pressure sensor, is different from other gas pressure measuring sensors of an engine in the same way, has the same working principle and different purposes. Pressure is a key parameter in the aerospace and aeronautical industries requiring high accuracy for both static and dynamic pressure measurements of local pressure and the entire pressure field. The ideal sensor for this aspect is usually a multi-channel pressure sensor, which integrates multiple pressure sensors in one pressure sensor, has small volume and high reliability, can measure pressure parameters with multiple different measuring ranges, and has wide application range. The multi-channel pressure sensor can convert a sensed pressure signal into a voltage signal, the voltage signal is provided for the A/D converter to be converted into a digital signal after signal conditioning, and the pressure signal is output in a bus form and provided for the engine controller after data processing and resolving of the processor. In order to detect the input-output characteristics of the multi-channel pressure sensor in the production process, the multi-channel pressure sensor needs to apply pressure test pressurization for multiple times. Because an error exists between the pressure of the actual multichannel pressure measurement system and the set pressure, the output parameters of the standard pressure sensor are required to be used as an ideal data source to verify the test data of the pressure sensor to be tested. Furthermore, the air supply system must ensure a stable air pressure in the working container in order for the system to obtain meaningful data when detecting performance parameters of the pressure sensor. Therefore, the pressure regulating system also needs a signal which can represent the actual air pressure in the current working container and is fed back to the lower computer controller to form a closed loop so as to ensure the stability of the pressure. In addition, the stability of the gas supply system itself is also ensured. In order to simulate the air inlet supercharging condition of the turbocharger when the engine works; in the prior art, an air passage of an air supply system and a pressure regulating electromagnetic valve form an acquisition system to acquire output voltage signals of a pressure sensor to be measured and a standard pressure sensor. The gas source pipeline is connected with the tested pressure sensor test piece, so that the gas source pipeline is narrow in detection and assembly space, complex to assemble and disassemble, a plurality of pipelines need to be connected when the multichannel pressure sensor test piece is tested, the number of the test pieces capable of being tested simultaneously is limited, the test efficiency is low, the assembling and disassembling of the test pipelines are prone to scratching, and the low-temperature air leakage is prone to occurring.
With the progress and development of pressure sensor technology, especially the improvement of stability, reliability, accuracy grade and working environment adaptability, the application range of the pressure sensor is wider and wider, so that the regular metering calibration of the pressure sensor is a necessary means for ensuring the accurate and reliable measurement of the testing equipment. At present, in the industries of water conservancy, electric power, petrochemical industry, light industry machinery and the like, a pressure gauge or a short-distance capillary transmission pressure gauge is generally installed on site for measuring pressure parameters in a production site, and is required to be installed near the pressure site to be measured, and an operator regularly patrols the pressure parameters of each point. The measuring mode is high in labor intensity of operators and cannot observe the change of pressure parameters of all points in the operation process of the equipment at any time. The traditional pressure sensor calibration method is that the pressure value of a standard pressure generator is changed, the output signal of a pressure sensor is recorded on the verification original recording paper, and then all information is recorded into a computer to fit the error information of the pressure sensor by a least square method. The manual calibration mode not only has low working efficiency, but also can generate a large error caused by manual misoperation and influence the calibration result.
The verification of a pressure sensor is a relatively complex process. The traditional calibration mode of the pressure sensor is completed manually, the working efficiency is low, and due to the fact that the calibration process is multiple and tedious in operation links, human errors are easily introduced, more uncertainty is brought to the determination of performance parameters of the pressure sensor, and the defects caused by human errors are avoided. In order to improve the working efficiency, reduce the labor intensity and improve the calibration precision, the prior art generally adopts a terminal communication connection technology, a computer issues a control instruction to a high-precision pressure controller and a multi-channel data acquisition unit, so that a pressure sensor obtains standard pressure generated by the high-precision pressure controller and outputs a corresponding signal, the data acquisition unit acquires a sensor output signal and returns the sensor output signal to the computer to complete a cycle process of data analysis and processing, and sensor calibration data are automatically generated. The hardware of the measurement and control system is generally connected in a networking way by hardware equipment components such as an electronic computer, a high-precision pressure controller, a data acquisition system, a printer, a vacuum pump, a high-pressure nitrogen source and the like through an RS232 interface of the computer. The data acquisition system converts various physical signals of the multi-channel pressure sensor field into voltage signals or current signals which can be received by the data acquisition card or voltage signals or current signals which can be received by the signal conditioning board. The computer communicates with external equipment and working environment, the software system organically combines a high-precision pressure controller, a data acquisition system and a printer together to realize a series of automatic processes such as cyclic loading, automatic stability judgment, data acquisition and the like, the data acquisition card realizes the data transmission and information exchange between the controlled object system and the computer, the signals of the data acquisition card are operated to obtain instructions and parameters necessary for the normal work of the system, and the sensors are automatically calibrated simultaneously. Then output to other industrial controllers of related equipment to realize on-line monitoring of the control system and on-line modification of parameters. In order to realize the multi-channel automatic calibration system of the sensor, the system adopts an anti-lock release function in the automatic calibration process, and in order to avoid that a program does not respond in the time of calibration time or the system control authority level is set and the system control authority is released by DoEvents statements under the condition that the pressure stabilization waiting time exceeds a set time limit and other abnormal conditions, the smooth operation of the system and the stability of a computer system in the calibration process are ensured. Meanwhile, an automatic/manual calibration mode is adopted, and a load self-stability judging function is exerted in a manual mode. After the standard pressure is applied to the sensor, a state register of the high-precision pressure controller is read, a certain time delay is assisted, and whether the numerical difference value of the state register is smaller than a set stability judgment standard or not is judged circularly. In order to obtain effective and stable test data, except for judging the load carried by the sensor, software is usually adopted for delay processing; the corresponding output signal of the sensor is interpreted, so that more than 10 valid data can be continuously sampled in each trigger signal period. However, in actual operation, when the loading pressure is stable in the whole debugging stage of the system, due to frequent switching of the pressure output valve inside the high-precision pressure controller, the pressure input of the pressure sensor has certain fluctuation, the output signal of the sensor often has small fluctuation, the output fluctuation characteristic presents certain regularity, and the drift amount of the coefficient of the pressure sensor is relatively large, and is particularly obvious on the pressure sensor for analog output.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the pressurizing device for the multichannel pressure sensor test box, which is convenient and quick to clamp, high in test efficiency and reliable to use, and a method for pressurizing and testing pressure parameters of the multichannel pressure sensor test box, so as to solve the problems of low batch test qualification rate, unstable quality control, high performance index dispersity and the like of the multichannel pressure sensor.
The technical scheme provided by the invention for solving the technical problems is that the method for testing the pressure parameters of the multi-channel sensor has the following technical characteristics: preparing a current collecting frame platform 1 connected with an external air source and a multi-channel pressure sensor, arranging a setting area for positioning a standard pressure generator test piece on the current collecting frame platform 1, arranging strip-shaped sealing ring positioning grooves 10 on the setting area according to a linear array, forming a through hole longitudinally communicated with a pressure transmission channel and a pressure output adapter 4 for vertically positioning the standard pressure generator test piece upwards by each strip-shaped sealing ring positioning groove 10, sealing the sealing ring positioning grooves 10 by strip-shaped sealing rings 5 connected by two built-in positioning pins 2 and strip-shaped cover plates 6 connected on the sealing ring positioning grooves, assembling a plug 8 at one end of the through hole along the length direction of the current collecting frame platform 1, and assembling a nozzle 6 at the other end of the through hole; the pipeline of external detection air supply is connected with filler neck 3, and the pressure transmission passageway that detects the air supply through mass flow frame platform 1 gets into pressure output adapter 4, and different pressure values of output or evacuation pipeline gas reach inside standard pressure generator test piece 9, accomplish to set up the district by the pre-compaction of school multichannel pressure sensor, pressurize simultaneously, gas tightness, input-output characteristic and multi-parameter.
Compared with the prior art, the invention has the following beneficial effects:
the clamping is convenient and fast. According to the invention, the setting area for positioning the standard pressure generator test piece is arranged on the flow collecting frame platform 1, the strip-shaped sealing ring positioning grooves which are arranged according to the linear array are arranged on the setting area, the strip-shaped sealing ring positioning grooves are communicated with the through hole of the pressure transmission channel and the pressure output adapter for vertically and upwardly positioning the standard pressure generator test piece, so that the test piece can be conveniently installed and fixed on the surface of the rectangular panel, the connecting pipe nozzle is connected by using an external detection gas source pipeline, the test and installation are convenient, and the problem that the detection gas source is directly connected with the test piece is solved.
The testing efficiency is high. The invention adopts the flow collecting frame platform connected with the external air source and the multi-channel pressure sensor to connect the test pieces, increases the installation area of the test pieces, improves the installation quantity of the test pieces, can meet the requirement of simultaneous pressurization of a plurality of test pieces and solves the problem of low test efficiency.
The use is reliable. The linear array plug air-tight seal pressure transmission channel arranged on the wide side face of the rectangular panel 1 can be repeatedly used for multiple times, the simultaneous pressurization or selective pressurization of the test pieces 9 of a plurality of multi-channel pressure sensors can be met, the sealing of the pressure transmission channel is ensured, the sealing of an idle channel is ensured by the strip-shaped cover plate 6, and the testing of less than 6 test pieces is met; the working efficiency and the working quality of the measurement and calibration of the pressure sensor are improved. The test piece is made of materials which can meet the sealing requirement of the strip-shaped sealing washer used in the high-temperature and low-temperature environment, and the problem that the test piece is easy to leak gas in the low-temperature environment is solved. Through the through holes of the plurality of strip-shaped sealing ring positioning grooves longitudinally communicated with the pressure transmission channels and the pressure output adapter of the vertical upward positioning standard pressure generator testing piece, a plurality of testing pieces are connected, and the problems that the batch testing yield of the multi-channel pressure sensors is low, the quality control is unstable, the performance index dispersibility of the multi-channel pressure sensors is large and the like are solved.
The invention is made of metal material.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention.
FIG. 1 is an exploded view of the apparatus for testing pressure parameters of a multi-channel sensor according to the present invention;
FIG. 2 is a left side view of FIG. 1;
fig. 3 is a use state reference diagram of the present invention.
In the figure: the device comprises a flow collecting frame platform 1, a positioning pin 2, a filler neck 3, a pressure output adapter 4, a strip-shaped sealing ring 5, a strip-shaped cover plate 6, a support column 7, a plug 8, a multichannel pressure sensor testing piece 9 and a sealing ring positioning groove 10.
Refer to fig. 1 and 2. According to the invention, a collecting frame platform 1 which is connected with an external air source and a multi-channel pressure sensor is prepared, an arrangement area for positioning a standard pressure generator test piece is arranged on the collecting frame platform 1, strip-shaped sealing ring positioning grooves 10 are arranged on the arrangement area according to a linear array, each strip-shaped sealing ring positioning groove 10 is provided with a through hole which is longitudinally communicated with a pressure transmission channel and a pressure output adapter 4 which vertically positions the standard pressure generator test piece upwards, the sealing ring positioning grooves 10 are sealed by strip-shaped sealing rings 5 which are connected through two built-in positioning pins 2 and strip-shaped cover plates 6 which are connected with the sealing rings, one end of the through hole along the length direction of the collecting frame platform 1 is provided with a plug 8, and the other; the pipeline of external detection air supply is connected with filler neck 3, and the pressure transmission passageway that detects the air supply through mass flow frame platform 1 gets into pressure output adapter 4, and different pressure values of output or evacuation pipeline gas reach inside standard pressure generator test piece 9, accomplish to set up the district by the pre-compaction of school multichannel pressure sensor, pressurize simultaneously, gas tightness, input-output characteristic and multi-parameter.
In the embodiment described below, four circular arc-shaped transitional lugs are formed on the outer side in the length direction of the collector platform 1, and support posts 7 for supporting the collector platform 1 are arranged below the lugs. A filler neck 3 communicated with each pressure channel which is independent mutually is arranged on the vertical plane of the wide side of the collecting frame platform 1. Two symmetrical positioning screw holes for fixing the positioning pins 2 are formed in the sealing ring positioning grooves 10 which are distributed according to the line distance. Two pressure output adapters 4 arranged at a line distance are arranged between the two symmetrical positioning screw holes.
The rectangular panel 1 is provided with 2 multiplied by 6 sealing ring positioning grooves 10 arranged according to line distance, 24 pressure output holes for positioning the pressure output adapter 4 and 24 positioning screw holes for fixing the positioning pin 2 which are arranged in 12 sealing ring positioning groove 10 slotted holes. The linear array plugs 8 arranged on the wide side surfaces of the rectangular panel 1 are communicated with the pressure transmission channel in an airtight manner, and can meet the requirement that 6 standard pressure generator test pieces 9 are pressurized or selectively pressurized simultaneously.
See fig. 3. When in use, the multi-channel pressure generator test piece 9 is fixed on the pressure output adapter 4 on the surface of the rectangular panel 1, and an external inspection air source pipeline is connected on the filler pipe mouth 3.
If the number of the standard pressure generator test pieces 9 is less than 6, assembling a strip-shaped cover plate 6 on the idle channel, and connecting and fixing by using screws; after use, the external detection air source pipeline is taken down, and then the multi-channel pressure sensor testing piece 9 is taken down.
While the foregoing has described preferred embodiments of the present invention, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention. It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. The method for testing the pressure parameter of the multi-channel sensor has the following technical characteristics: preparing an on-flow-frame platform (1) connected with an external air source and a multi-channel pressure sensor, arranging a setting area for positioning a standard pressure generator testing piece on the flow-collecting frame platform (1), arranging strip-shaped sealing ring positioning grooves (10) according to a linear array on the setting area, manufacturing a through hole longitudinally communicated with a pressure transmission channel and a pressure output adapter (4) for vertically and upwardly positioning the standard pressure generator testing piece by each strip-shaped sealing ring positioning groove (10), and sealing the sealing ring positioning grooves (10) by strip-shaped sealing rings (5) connected with two built-in positioning pins (2) and strip-shaped cover plates (6) connected with the sealing ring positioning grooves; the pipeline of external detection air supply is connected with filler neck (3), and the pressure transmission passageway that detects the air supply and pass through mass flow frame platform (1) gets into pressure output adapter (4), and output different pressure values or evacuation pipeline gas arrive standard pressure generator test piece (9) inside, accomplish to set up the district by the pre-compaction of school multichannel pressure sensor, pressurize simultaneously, the gas tightness, input-output characteristic and many parameters.
2. The method for testing the pressure parameters of the multichannel sensor as claimed in claim 1, characterized in that four circular arc transitional lugs are formed on the outer side in the length direction of the manifold frame platform (1), and support columns (7) for supporting the manifold frame platform (1) are arranged below the lugs.
3. The method for testing the pressure parameters of a multi-channel sensor as claimed in claim 1, characterized in that the wide vertical plane of the manifold platform (1) is provided with a filler neck (3) for connecting each pressure channel.
4. The method for testing the pressure parameters of a multi-channel sensor as claimed in claim 1, characterized in that two symmetrical positioning screw holes for fixing the positioning pins (2) are formed in the sealing ring positioning grooves (10) which are distributed at a linear distance.
5. Method for testing pressure parameters of a multi-channel sensor according to claim 4, characterized in that between two symmetrically positioned screw holes, two pressure output adapters (4) are provided in line-spaced arrangement.
6. The method for testing the pressure parameters of a multi-channel sensor as claimed in claim 1, wherein at least 2 x 6 sealing ring positioning slots (10) are formed on the rectangular panel (1) in a line-spacing arrangement, and at least 24 pressure output holes for positioning the pressure output adapter (4) and (24) positioning threaded holes for fixing the positioning pins (2) are formed in the slotted holes of (12) sealing ring positioning slots (10).
7. The method for testing the pressure parameters of the multi-channel sensor as claimed in claim 1, characterized in that the linear array plugs (8) arranged on the sides of the wide sides of the rectangular panel (1) are hermetically communicated with the pressure transmission channels, so that at least 6 multi-channel pressure sensor test pieces (9) can be pressurized simultaneously or selectively.
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| US20220153536A1 (en) * | 2019-11-19 | 2022-05-19 | Vtec Co., Ltd. | Vacuum multi-sensing unit |
| CN115077779A (en) * | 2022-06-13 | 2022-09-20 | 浙江思格传感器智能检测技术有限公司 | Operation test module for multi-channel pressure sensor |
| CN117968937A (en) * | 2024-04-01 | 2024-05-03 | 沈阳仪表科学研究院有限公司 | Differential pressure sensor testing device |
| CN118225318A (en) * | 2024-05-22 | 2024-06-21 | 深圳市锦锐科技股份有限公司 | Self-adaptive air pressure correction device and method for air pressure sensor |
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