阅读说明：本技术 压力传感器标定系统及方法 (Pressure sensor calibration system and method ) 是由 裴仁忠 王中兴 康利利 刘志尧 杨永友 于 2021-06-21 设计创作，主要内容包括：本发明公开了一种压力传感器标定系统及方法,该系统包括：温箱,用于为待标定压力传感器和标准压力传感器提供工作环境温度；采集控制单元,其分别与温箱、待标定压力传感器和标准压力传感器连接,采集控制单元用于获取待标定压力传感器输出的电信号数据、温箱的温度数据和标准压力传感器输出的标准压力数据,以及用于控制温箱,使其达到设定的温度；终端,其与采集控制单元连接,终端用于发送控制指令,以使温箱达到设定的温度,并获取采集控制单元输出的待标定压力传感器的电信号数据、温度数据与标准压力数据,并基于电信号数据、温度数据与标准压力数据,以实现对待标定压力传感器的标定。(The invention discloses a pressure sensor calibration system and a method, wherein the system comprises: the temperature box is used for providing working environment temperature for the pressure sensor to be calibrated and the standard pressure sensor; the system comprises an acquisition control unit, a temperature sensor, a pressure sensor to be calibrated and a standard pressure sensor, wherein the acquisition control unit is respectively connected with the temperature box, the pressure sensor to be calibrated and the standard pressure sensor, and is used for acquiring electric signal data output by the pressure sensor to be calibrated, temperature data of the temperature box and standard pressure data output by the standard pressure sensor, and controlling the temperature box to reach a set temperature; and the terminal is connected with the acquisition control unit and used for sending a control command so as to enable the incubator to reach the set temperature, acquiring the electric signal data, the temperature data and the standard pressure data of the pressure sensor to be calibrated, which are output by the acquisition control unit, and calibrating the pressure sensor to be calibrated based on the electric signal data, the temperature data and the standard pressure data.)

1. A pressure sensor calibration system, comprising:

the temperature box is used for providing working environment temperature for the pressure sensor to be calibrated and the standard pressure sensor;

the acquisition control unit is respectively connected with the incubator, the pressure sensor to be calibrated and the standard pressure sensor, and is used for acquiring electric signal data output by the pressure sensor to be calibrated, temperature data of the incubator and standard pressure data output by the standard pressure sensor, and controlling the incubator to reach a set temperature;

the terminal is connected with the acquisition control unit and used for sending a control command to enable the incubator to reach a set temperature, acquiring the electric signal data, the temperature data and the standard pressure data of the pressure sensor to be calibrated, which are output by the acquisition control unit, and calibrating the pressure sensor to be calibrated based on the electric signal data, the temperature data and the standard pressure data;

a pipe device disposed in the incubator, the pipe device comprising:

the pipeline mechanism is provided with a pressurization inlet, a pressure relief outlet and a plurality of working outlets, and the plurality of working outlets are arranged between the pressurization inlet and the pressure relief outlet; wherein the content of the first and second substances,

the pressurization inlet is used for being connected with the pressure source and providing set pressure for the pressure sensor to be calibrated and the standard pressure sensor;

the plurality of working outlets are used for being respectively connected with each pressure sensor to be calibrated and the standard pressure sensor.

2. The system for calibrating a pressure sensor as claimed in claim 1, wherein a pressurization valve is provided between said pipeline mechanism and said pressure source, an inlet of said pressurization valve is communicated with said pressure source through a pressure pipeline, and an outlet of said pressurization valve is communicated with said pressurization inlet through a pressure pipeline;

and a pressure pipeline of the pressure relief outlet is provided with a pressure relief valve, and the pressure pipeline of the pressure relief outlet extends into the collecting bottle.

3. The pressure sensor calibration system of claim 1, wherein said conduit means further comprises:

a base;

and the guide rail is connected with the base, and the pipeline mechanism is in sliding connection with the guide rail so as to enable the pipeline mechanism to move up and down relative to the base.

4. The pressure sensor calibration system of claim 3, wherein the conduit means comprises:

mounting a plate;

the pipeline unit is fixedly connected with the mounting plate and is provided with the pressurizing inlet, the pressure relief outlet and the working outlets;

the slider, its with the mounting panel is connected fixedly, just the slider is located the four corners of mounting panel, be equipped with the spout on the guide rail, slider and spout sliding fit.

5. The pressure sensor calibration system of claim 4, wherein the acquisition control unit comprises:

the interface converter is used for acquiring and converting data according to the electrical signal interfaces of different sensors; and

and the controller is connected with the interface converter and is used for controlling the incubator to reach a set temperature and acquiring the electric signal data output by the pressure sensor to be calibrated, the temperature data of the incubator and the standard pressure data output by the standard pressure sensor.

6. A pressure sensor calibration method is characterized by comprising the following steps:

arranging a pipeline device in the incubator, and connecting a pressure sensor to be calibrated and a standard pressure sensor to a working outlet of the pipeline device;

connecting the pressurized inlet of the line set to a pressure source;

respectively connecting an acquisition control unit with a temperature box, a pressure sensor to be calibrated and a standard pressure sensor;

connecting a terminal with the acquisition control unit;

based on the received control instruction, the temperature box is adjusted to a set temperature, and working environment temperatures are provided for the pressure sensor to be calibrated and the standard pressure sensor;

adjusting the pressure source to a set pressure to provide the set pressure for the pressure sensor to be calibrated and the standard pressure sensor;

acquiring electric signal data output by the pressure sensor to be calibrated, temperature data of the incubator and standard pressure data output by a standard pressure sensor;

and calibrating the pressure sensor to be calibrated based on the electric signal data, the temperature data and the standard pressure data.

7. The method for calibrating a pressure sensor according to claim 6, wherein the step of adjusting the temperature chamber to a set temperature based on the received control command, before providing the working environment temperature for the pressure sensor to be calibrated and the standard pressure sensor, further comprises checking the airtightness of the pipeline device:

opening a pressurizing valve and a pressure reducing valve, uniformly pressing a self-priming pump of a pressure source, discharging gas in a pressure pipeline of a pipeline device, and judging whether the gas in the pressure pipeline is completely discharged or not by observing the condition that bubbles in a hydraulic oil collecting bottle emerge;

closing the pressure reducing valve after the gas in the pressure pipeline is discharged, uniformly and slowly pressurizing the pressure sensor to be calibrated through the pressure source until the pressure reaches a target pressure, and checking whether the pressure can be normally added and whether hydraulic oil leaks from the pipeline device;

the target pressure is maintained for 10 minutes, and when the pressure is stabilized, the pressure of the pipeline device is adjusted to zero.

8. The method for calibrating a pressure sensor according to claim 6, wherein calibrating the pressure sensor to be calibrated based on the electrical signal data, the temperature data and the standard pressure data comprises:

s51, setting a first temperature calibration value and setting a plurality of pressure calibration values under the first temperature calibration value, wherein the first temperature calibration value is sent to an acquisition control unit through a terminal, and the acquisition control unit controls the temperature adjustment of the incubator so as to keep the incubator at the first temperature calibration value;

s52, under the first temperature calibration value, adjusting the pressure calibration value through the pressure source, and feeding back the pressure calibration value to the terminal through the standard pressure sensor;

s53, acquiring electrical signal data of the pressure sensor to be calibrated under each pressure calibration value, and fitting the electrical signal data and the pressure calibration values to obtain a calibration fitting curve;

and S54, repeating S51, S52 and S53 to obtain corresponding calibration fitting curves at different temperatures, and obtaining the calibration scale coefficient value of the pressure sensor to be calibrated according to the calibration fitting curves at the corresponding temperatures.

9. The method for calibrating a pressure sensor according to claim 8, wherein calibrating the pressure sensor to be calibrated based on the electrical signal data, the temperature data and the standard pressure data further comprises:

and converting the output value of the pressure sensor to be calibrated into a new pressure measurement value based on the calibration scale coefficient value, comparing the new pressure measurement value with the standard pressure value, successfully calibrating when the error is smaller than a set threshold value, and writing the calibration scale coefficient into the pressure sensor to be calibrated.

Technical Field

The invention belongs to the technical field of pressure sensor calibration, and particularly relates to a pressure sensor calibration system and method.

Background

A pressure transducer is a device or apparatus that senses a pressure signal and converts the pressure signal into a usable output electrical signal according to a certain rule. The pressure sensor is widely applied to the fields of automobiles, aerospace, medical treatment, oil well logging and the like, and is used as a core component for measuring pressure in the fields, and the pressure sensor is required to have the characteristics of high measurement precision and high reliability. The pressure sensor converts the sensed pressure signal into an electric signal through a signal conversion process and outputs the electric signal, the output signal Uout and the input pressure value P have a determined functional relation, and some temperature-sensitive sensors also have a temperature-dependent relation. When the pressure sensor leaves the factory for the first time, the conversion relation and coefficient between the output signal and the pressure input value, and performance indexes such as the measurement accuracy of the sensor and the like need to be determined through a calibration process. On one hand, because some errors are introduced by manufacturing materials, processes and other factors, the pressure value actually measured by the pressure sensor is deviated from the true value, and therefore calibration needs to be performed before use. On the other hand, as the usage time increases, the pressure sensitive element of the pressure sensor changes in physical property, so that the conversion coefficient between the output signal and the pressure input value changes, the measurement accuracy of the pressure sensor decreases to different degrees, sometimes even exceeds the nominal scale, and cannot be used continuously, and the accuracy needs to be calibrated periodically.

At present, the commonly used pressure sensor calibration device is provided with a piston pressure gauge, a lever type and a spring pressure gauge type calibration system, when the calibration systems are used for pressure calibration, calibration needs to be manually carried out according to a complex calibration program, specifically, the calibration system comprises manual pressure source pressure adjustment, manual recording, pressure data input and measurement data input, and the manual calibration has the problems of low control precision, large system error, inaccurate calibration result, low working efficiency, high cost and the like.

Disclosure of Invention

Objects of the invention

The invention aims to provide a pressure sensor calibration system and a pressure sensor calibration method, wherein the ambient temperature and the working pressure of a pressure sensor to be calibrated and a standard pressure sensor are the same, electric signal data are output by the pressure sensor to be calibrated, the standard pressure sensor measures to obtain a working pressure value, a terminal fits the obtained electric signal data with the working pressure value to obtain a calibration scale factor value of the pressure sensor to be calibrated, and automatic calibration of the pressure sensor to be calibrated can be realized.

(II) technical scheme

To solve the above problem, a first aspect of the present invention provides a pressure sensor calibration system, including: the temperature box is used for providing working environment temperature for the pressure sensor to be calibrated and the standard pressure sensor; the acquisition control unit is respectively connected with the incubator, the pressure sensor to be calibrated and the standard pressure sensor, and is used for acquiring electric signal data output by the pressure sensor to be calibrated, temperature data of the incubator and standard pressure data output by the standard pressure sensor, and controlling the incubator to reach a set temperature; the terminal is connected with the acquisition control unit and used for sending a control command to enable the incubator to reach a set temperature, acquiring the electric signal data, the temperature data and the standard pressure data of the pressure sensor to be calibrated, which are output by the acquisition control unit, and calibrating the pressure sensor to be calibrated based on the electric signal data, the temperature data and the standard pressure data; a pipe device disposed in the incubator, the pipe device comprising: the pipeline mechanism is provided with a pressurization inlet, a pressure relief outlet and a plurality of working outlets, and the plurality of working outlets are arranged between the pressurization inlet and the pressure relief outlet; the pressurization inlet is used for being connected with the pressure source and providing set pressure for the pressure sensor to be calibrated and the standard pressure sensor; the plurality of working outlets are used for being respectively connected with each pressure sensor to be calibrated and the standard pressure sensor.

Preferably, a pressurizing valve is arranged between the pipeline mechanism and the pressure source, an inlet of the pressurizing valve is communicated with the pressure source through a pressure pipeline, and an outlet of the pressurizing valve is communicated with the pressurizing inlet through a pressure pipeline; and a pressure pipeline of the pressure relief outlet is provided with a pressure relief valve, and the pressure pipeline of the pressure relief outlet extends into the collecting bottle.

Preferably, the piping device further comprises: a base; and the guide rail is connected with the base, and the pipeline mechanism is in sliding connection with the guide rail so as to enable the pipeline mechanism to move up and down relative to the base.

Preferably, the piping mechanism includes: mounting a plate; the pipeline unit is fixedly connected with the mounting plate and is provided with the pressurizing inlet, the pressure relief outlet and the working outlets; the slider, its with the mounting panel is connected fixedly, just the slider is located the four corners of mounting panel, be equipped with the spout on the guide rail, slider and spout sliding fit.

Preferably, the acquisition control unit includes: the interface converter is used for acquiring and converting data according to the electrical signal interfaces of different sensors; and the controller is connected with the interface converter and is used for controlling the incubator to reach a set temperature and acquiring electric signal data output by the pressure sensor to be calibrated, temperature data of the incubator and standard pressure data output by a standard pressure sensor.

The second aspect of the present invention provides a method for calibrating a pressure sensor, including: arranging a pipeline device in the incubator, and connecting a pressure sensor to be calibrated and a standard pressure sensor to a working outlet of the pipeline device; connecting the pressurized inlet of the line set to a pressure source; respectively connecting an acquisition control unit with a temperature box, a pressure sensor to be calibrated and a standard pressure sensor; connecting a terminal with the acquisition control unit; based on the received control instruction, the temperature box is adjusted to a set temperature, and working environment temperatures are provided for the pressure sensor to be calibrated and the standard pressure sensor; adjusting the pressure source to a set pressure to provide the set pressure for the pressure sensor to be calibrated and the standard pressure sensor; acquiring electric signal data output by the pressure sensor to be calibrated, temperature data of the incubator and standard pressure data output by a standard pressure sensor; and calibrating the pressure sensor to be calibrated based on the electric signal data, the temperature data and the standard pressure data.

Preferably, based on the received control command, the method further includes checking the airtightness of the pipeline device before adjusting the incubator to the set temperature and providing the working environment temperature for the pressure sensor to be calibrated and the standard pressure sensor: opening a pressurizing valve and a pressure reducing valve, uniformly pressing a self-priming pump of a pressure source, discharging gas in a pressure pipeline of a pipeline device, and judging whether the gas in the pressure pipeline is completely discharged or not by observing the condition that bubbles in a hydraulic oil collecting bottle emerge; closing the pressure reducing valve after the gas in the pressure pipeline is discharged, uniformly and slowly pressurizing the pressure sensor to be calibrated through the pressure source until the pressure reaches a target pressure, and checking whether the pressure can be normally added and whether hydraulic oil leaks from the pipeline device; the target pressure was maintained for 10 minutes and when the pressure stabilized, the system pressure was adjusted to zero.

Preferably, the calibrating the pressure sensor to be calibrated based on the electrical signal data, the temperature data and the standard pressure data comprises: s51, setting a first temperature calibration value and setting a plurality of pressure calibration values under the first temperature calibration value, wherein the first temperature calibration value is sent to the incubator through the acquisition control unit so as to enable the incubator to keep the first temperature calibration value; s52, under the first temperature calibration value, adjusting the pressure calibration value through the pressure source, and feeding back the pressure calibration value to the terminal through the standard pressure sensor; s53, acquiring electrical signal data of the pressure sensor to be calibrated under each pressure calibration value, and fitting the electrical signal data and the pressure calibration values to obtain a calibration fitting curve; and S54, repeating S51, S52 and S53 to obtain corresponding calibration fitting curves at different temperatures, and obtaining the calibration scale coefficient value of the pressure sensor to be calibrated according to the calibration fitting curves at the corresponding temperatures.

Preferably, the calibrating the pressure sensor to be calibrated based on the electrical signal data, the temperature data and the standard pressure data further comprises: and converting the output value of the pressure sensor to be calibrated into a new pressure measurement value based on the calibration scale coefficient value, comparing the new pressure measurement value with the standard pressure value, successfully calibrating when the error is smaller than a set threshold value, and writing the calibration scale coefficient into the pressure sensor to be calibrated.

(III) advantageous effects

The technical scheme of the invention has the following beneficial technical effects:

1. according to the pressure sensor calibration system and method provided by the invention, the ambient temperature and the working pressure of the to-be-calibrated pressure sensor and the standard pressure sensor are the same, the electric signal data are output by the to-be-calibrated pressure sensor, the working pressure value is obtained by the standard pressure sensor, the obtained electric signal data are fitted with the working pressure value by the terminal, the calibration scale coefficient value of the to-be-calibrated pressure sensor can be obtained, and the automatic calibration of the to-be-calibrated pressure sensor can be realized, so that the calibration precision of the to-be-calibrated pressure sensor can be improved, the error is reduced, the calibration result is more accurate, the working efficiency is improved and the calibration cost of the pressure sensor can be reduced because a plurality of to-be-calibrated pressure sensors can be calibrated at the same time.

2. The pressure sensor calibration system and method provided by the invention can check the air tightness of the pipeline before the calibration test, can finish the gas discharge in the pressure pipeline of the pipeline device, ensure the smooth operation of the calibration test and ensure the more accurate calibration result.

3. The pressure sensor calibration system provided by the invention has the advantages that the application range of the pipeline device is larger through the up-and-down lifting movement of the pipeline mechanism, and the pipeline device is suitable for the working condition that the working medium is gas or hydraulic oil, so that the manufacturing cost of equipment can be saved.

Drawings

FIG. 1 is a block diagram of a pressure sensor calibration system according to the present invention;

FIG. 2 is a block diagram of a pressure control system for a piping unit according to the present invention;

FIG. 3 is a schematic diagram of a piping arrangement according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a piping unit according to another embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a piping unit according to still another embodiment of the present invention;

FIG. 6 is a flow chart of a method for calibrating a pressure sensor according to the present invention;

FIG. 7 is a calibration fitting curve of a pressure sensor to be calibrated according to the present invention;

reference numerals:

11-an incubator; 12-an acquisition control unit; 13-a terminal; 14-a collection bottle; 15-a pressure source; 16-a pressure valve; 17-a pressure reducing valve; 18-a base; 19-a guide rail; 20-a piping unit; 21-mounting a plate; 22-a slide block; 23-a chute; 24-a pressure sensor to be calibrated; 25-standard pressure sensor; 26-a protective frame;

121-interface converter; 122-a controller; 201-a pressurized inlet; 202-pressure relief vent.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

According to an embodiment of the present invention, in a first aspect, the present invention provides a pressure sensor calibration system, including: an incubator 11, an acquisition control unit 12, a terminal 13 and a pipeline device. As shown in fig. 1 to 5, an incubator 11 is used for providing a working environment temperature for a pressure sensor 24 to be calibrated and a standard pressure sensor 25; the acquisition control unit 12 is respectively connected with the incubator 11, the pressure sensor 24 to be calibrated and the standard pressure sensor 25, and the acquisition control unit 12 is used for acquiring electric signal data output by the pressure sensor 24 to be calibrated, temperature data of the incubator 11 and standard pressure data output by the standard pressure sensor 25, and controlling the incubator 11 to reach a set temperature; the terminal 13 is connected with the acquisition control unit 12, and the terminal 13 is configured to send a control instruction so as to enable the incubator 11 to reach a set temperature, acquire electrical signal data, temperature data and standard pressure data of the pressure sensor 24 to be calibrated, which are output by the acquisition control unit 12, and calibrate the pressure sensor 24 to be calibrated based on the electrical signal data, the temperature data and the standard pressure data; a piping device provided in the incubator 11, the piping device comprising: a piping means having a pressure inlet 201, a pressure relief outlet 202 and a plurality of said working outlets provided between said pressure inlet 201 and said pressure relief outlet 202; the pressurizing inlet 201 is used for being connected with the pressure source 15 and providing set pressure for the pressure sensor 24 to be calibrated and the standard pressure sensor 25; a plurality of said working outlets are intended to be connected to each pressure sensor 24 to be calibrated and to a standard pressure sensor 25, respectively. When the pressure source 15 provides working pressure for the pipeline mechanism, gas or hydraulic oil can be used as a medium, and it can be understood that the embodiment of the invention uses hydraulic oil as a medium; the pressure provided by the pressure source 15 can be manually adjusted, and a plurality of working outlets can be arranged between the pressurizing inlet 201 and the pressure relief outlet 202 in a parallel connection manner, so that the working pressure of the medium output by each working outlet is the same, and the pressure loss on a pipeline cannot be caused; the standard pressure sensor 25 is a calibrated pressure sensor capable of providing a pressure value with higher measurement accuracy, the standard pressure sensor 25 is directly arranged on the pipeline mechanism, the working pressure of a medium in the pipeline mechanism can be directly measured, and standard pressure data (namely the working pressure value) is fed back through the standard pressure sensor 25, so that the measurement accuracy of the input standard pressure data is effectively guaranteed, and errors caused by human intervention are reduced. Meanwhile, the pressure sensor 24 to be calibrated feeds back corresponding electrical signal data under the same working pressure value, and different electrical signal data can be fed back under different working pressure values and are in one-to-one correspondence; because the pipeline device is arranged in the incubator, the environmental temperatures of the to-be-calibrated pressure sensor 24 and the standard pressure sensor 25 are the same, the terminal 13 can be a computer, the terminal 13 fits the acquired electrical signal data with the working pressure value, the calibration scale coefficient value of the to-be-calibrated pressure sensor 24 can be obtained, and the automatic calibration of the to-be-calibrated pressure sensor 24 can be realized, so that the calibration precision of the to-be-calibrated pressure sensor 24 can be improved, the error is reduced, the calibration result can be more accurate, the working efficiency is improved, and the calibration cost of the pressure sensor can be reduced because the calibration can be simultaneously carried out on a plurality of to-be-calibrated pressure sensors 24.

As shown in fig. 2, in order to check the air tightness of the pipeline, finish the gas discharge in the pressure pipeline of the pipeline device, ensure the smooth performance of the calibration experiment, and make the calibration result more accurate, it is preferable that a pressurizing valve 16 is provided between the pipeline mechanism and the pressure source 15, an inlet of the pressurizing valve 16 is communicated with the pressure source 15 through a pressure pipeline, and an outlet of the pressurizing valve 16 is communicated with the pressurizing inlet through a pressure pipeline; and a pressure pipeline at the outlet of the pressure relief outlet is provided with a pressure relief valve 17, and the pressure pipeline at the outlet of the pressure relief valve 17 extends into the collecting bottle. The pressurizing valve 16 may be an inlet valve for hydraulic oil, and may be used only to directly open or close the input of hydraulic oil, and the pressurizing valve 16 is opened before use, and the pressurizing valve 16 is closed after use. Before formal test, the pressurizing valve 16 is opened, and air in the pipeline is emptied by filling hydraulic oil; the pressure reducing valve 17 can be provided as an outlet valve for the hydraulic oil, which on the one hand can reduce the pressure of the hydraulic oil in the pressure line by adjusting the output pressure of the pressure reducing valve 17 and on the other hand can be used for gas venting in the pressure line before calibration. Before opening the pressurizing valve 16 and the pressure reducing valve 17, determining whether the pressure source 15 is filled with hydraulic oil, then opening the pressurizing valve 16 and the pressure reducing valve 17, uniformly pressing a self-priming pump of the pressure source 15, discharging gas in a pressure pipeline of the pipeline device, and judging whether the gas in the pressure pipeline is completely discharged by observing the condition that bubbles in a hydraulic oil collecting bottle burst; when no bubble emerges from the hydraulic oil collecting bottle, the gas in the pressure pipeline can be judged to be completely discharged; after the gas in the pressure pipeline is exhausted, closing the pressure reducing valve 17, uniformly and slowly pressurizing the pressure sensor 24 to be calibrated through the pressure source 15 until the pressure reaches the maximum pressure, and checking whether the pressure can be normally added and whether hydraulic oil leaks from the pipeline device; the pressure is kept at the maximum pressure for 10 minutes, whether the pressure is stable or not is observed, and if the pressure is unstable, whether leakage exists or whether the gas in the pipeline is exhausted or not needs to be checked. If the pressure remains stable after 10 minutes of holding, the pressure of the line set is adjusted to zero.

The pipe device further includes: a base 18; and a guide rail 19 connected to the base 18, wherein the piping mechanism is slidably connected to the guide rail 19 so as to move up and down with respect to the base 18. The pressure sensor 24 to be calibrated and the standard pressure sensor 25 can be conveniently installed by lifting and descending the pipeline mechanism, and when hydraulic oil is introduced into the pipeline mechanism, the pressure sensors can be installed downwards, so that the pressure of each working outlet can be kept the same; when gas is introduced into the pipeline mechanism, the pressure sensor can be installed upwards, so that the pressure of each working outlet can be kept the same; therefore, the pipeline device is wider in application range through the up-and-down lifting movement of the pipeline mechanism, and the manufacturing cost of the equipment can be saved.

The piping mechanism includes: a mounting plate 21; a pipeline unit 20 fixedly connected to the mounting plate 21, wherein the pipeline unit 20 is provided with the pressurizing inlet 201, a pressure relief outlet 202 and a plurality of working outlets; the slider 22, its with the mounting panel 21 is connected fixedly, just the slider 22 is located the four corners of mounting panel 21, be equipped with spout 23 on the guide rail 19, slider 22 and spout 23 sliding fit. The pipeline unit 20 can comprise a main pipeline, a tee joint and the like, the outer diameter of the tee joint and the mounting plate 21 can be fixedly connected through welding or threads, the tee joint comprises an inlet, an outlet and a working outlet, the inlet and the outlet are respectively fixedly connected with the main pipeline through welding or threads, and the working outlet and the pressure sensor can be detachably connected through threads and the like; the plurality of tee joints and the main pipeline can form a parallel connection mode. In order to make the up-and-down movement of the management unit 20 more stable and reliable, the sliding blocks 22 can be fixed at four corners of the mounting plate 21, and the sliding blocks 22 can be lifted up and down along the sliding grooves 23 on the guide rails 19; the slide block 22 may be provided with a threaded hole, the guide rail 19 may be correspondingly provided with a mounting long hole, and after the slide block 22 is lifted to a certain position, the slide block 22 is fixed on the guide rail 19 by screwing a bolt into the threaded hole through the mounting long hole, so that the position of the pipeline unit 20 is relatively fixed with respect to the base 18. The sliding blocks 22 can be symmetrically arranged, when the pressure sensor needs to be changed in the vertical installation direction, the pipeline mechanism can be installed by turning 180 degrees, and accordingly the pressurizing inlet 201 and the pressure relief outlet 202 can be connected through hoses.

The acquisition control unit 12 includes: an interface converter 121 for performing data acquisition and conversion according to electrical signal interfaces of different sensors; and a controller 122 connected to the interface converter 121, and connected to the terminal 13, wherein the controller 122 is configured to control the incubator 11 to reach a set temperature, and acquire electrical signal data output by the pressure sensor 24 to be calibrated, temperature data of the incubator 11, and standard pressure data output by the standard pressure sensor 25. The interface converter 121 is a data acquisition and conversion device developed according to the electrical signal interfaces of different pressure sensors, the controller 122 may include a processor, a communication protocol conversion module, and the like, and the processor may be an ARM processor; the controller 122 CAN provide a standard USB interface to connect with the computer terminal 13, provide 2-way USB, 5-way CAN, 1-way RS232, 1-way RS485 control interfaces to connect with the pressure source, the incubator and the pressure sensor, provide corresponding communication protocol conversion modules, and convert USB communication between the computer and the controller into a communication protocol adapted to the equipment.

The pressure sensor calibration system may further include: the protection frame 26, the pipe device can set up in the protection frame 26, and it is used for supporting the pipe device to treat calibration pressure sensor 24 can prevent to cause by accident that the pipe device explodes and injures people and causes the damage to other equipment when experimenting under high temperature and high pressure condition. The protective frame 26 comprises a framework, the framework can be welded into a box framework structure by a plurality of angle steels, an explosion-proof top plate 261 and an explosion-proof bottom plate 262 can be installed at the top and the bottom of the framework, and supporting frames 263 can be installed on the left side surface and the right side surface of the framework for reinforcement.

According to the specific implementation manner of the invention, in a second aspect, the invention provides a pressure sensor calibration method, which comprises the following steps: arranging a pipeline device in the incubator 11, and connecting a pressure sensor to be calibrated and a standard pressure sensor to a working outlet of the pipeline device; connecting the pressurized inlet of the line set with a pressure source 15; the acquisition control unit 12 is respectively connected with the incubator 11, the pressure sensor to be calibrated and the standard pressure sensor; a terminal 13 is connected to the acquisition control unit 12.

As shown in fig. 6, the method for calibrating a pressure sensor provided by the present invention specifically includes the following steps:

step S20, based on the received control instruction, adjusting the temperature box 11 to a set temperature to provide working environment temperature for the pressure sensor to be calibrated and the standard pressure sensor;

step S30, adjusting the pressure source 15 to a set pressure to provide the set pressure for the pressure sensor to be calibrated and the standard pressure sensor;

step S40, acquiring the electric signal data output by the pressure sensor to be calibrated, the temperature data of the incubator 11 and the standard pressure data output by the standard pressure sensor;

and step S50, calibrating the pressure sensor to be calibrated based on the electric signal data, the temperature data and the standard pressure data.

Step S20, based on the received control command, adjusting the temperature box 11 to the set temperature, and before providing the working environment temperature for the pressure sensor to be calibrated and the standard pressure sensor, the method also comprises the step S10 of checking the air tightness of the pipeline device: opening a pressurizing valve 16 and a pressure reducing valve 17, uniformly pressing a self-priming pump of a pressure source 15, discharging gas in a pressure pipeline of a pipeline device, and judging whether the gas in the pressure pipeline is completely discharged or not by observing the condition that bubbles in a hydraulic oil collecting bottle emerge; closing a pressure reducing valve 17 after the gas in the pressure pipeline is discharged, uniformly and slowly pressurizing the pressure sensor to be calibrated through a pressure source 15 until the pressure reaches a target pressure, and checking whether the pressure can be normally added and whether hydraulic oil leaks from a pipeline device; the target pressure was maintained for 10 minutes and when the pressure stabilized, the system pressure was adjusted to zero.

Step S50, based on the electrical signal data, the temperature data and the standard pressure data, the calibration of the pressure sensor to be calibrated comprises the following specific steps: s51, setting a first temperature calibration value and setting a plurality of pressure calibration values under the first temperature calibration value, wherein the first temperature calibration value is sent to the incubator 11 through the acquisition control unit 12 so as to enable the incubator 11 to keep the first temperature calibration value; s52, under the first temperature calibration value, adjusting the pressure calibration value through the pressure source 15 and feeding back the pressure calibration value to the terminal 13 through the standard pressure sensor; s53, acquiring electrical signal data of the pressure sensor to be calibrated under each pressure calibration value, and fitting the electrical signal data and the pressure calibration values to obtain a calibration fitting curve; and S54, repeating S51, S52 and S53 to obtain corresponding calibration fitting curves at different temperatures, and obtaining the calibration scale coefficient value of the pressure sensor to be calibrated according to the calibration fitting curves at the corresponding temperatures.

Step S50, based on the electrical signal data, the temperature data and the standard pressure data, the calibration of the pressure sensor to be calibrated further comprises:

s55: and converting the output value of the pressure sensor to be calibrated into a new pressure measurement value based on the calibration scale coefficient value, comparing the new pressure measurement value with the standard pressure value, successfully calibrating when the error is smaller than a set threshold value, and writing the calibration scale coefficient into the pressure sensor to be calibrated.

The specific implementation process of calibration by adopting the calibration system is as follows: the calibration plan is set by first setting temperature calibration points (e.g., T1, T2, T3) and then setting pressure calibration points (e.g., 0psi, 2500psi, 5000psi, 2500psi, 0 psi). Under the condition of the temperature T1, at each pressure point, the number of times of reading the output value of the pressure sensor to be calibrated can be set, and the average value is taken as the finally read output value of the pressure sensor to be calibrated, wherein the output value can be electric signal data such as a voltage value or a current value.

Fitting the final output value of the pressure sensor to be calibrated read by the set pressure calibration point (such as 0psi, 2500psi, 5000psi, 2500psi, 0psi), and obtaining a curve by fitting as shown in FIG. 7; the standard pressure value on the abscissa in fig. 7 is measured by the standard sensor, and the sensor output physical quantity (which is a current value mA) on the ordinate is output to the terminal 13 by the sensor to be calibrated under the same condition by using the calibration system described above.

Calibrating the sensor to be calibrated according to pressure calibration points (such as 0psi, 2500psi, 5000psi, 2500psi and 0psi) at the temperature T2 to obtain a calibration fitting curve at the temperature T2;

calibrating the sensor to be calibrated according to pressure calibration points (such as 0psi, 2500psi, 5000psi, 2500psi and 0psi) at the temperature T3 to obtain a calibration fitting curve at the temperature T3;

the calibration scale factor of the sensor to be calibrated can be obtained according to the calibration fitting curve, as shown in fig. 7, when the temperature is 25 ℃, the obtained calibration fitting curve of a certain sensor to be calibrated is an oblique line, the slope of the oblique line is the calibration scale factor, the output value of the sensor to be calibrated is converted into a new pressure value according to the calibration scale factor value, the pressure value is compared with the standard pressure (measured by the standard pressure sensor) again, if the maximum error is less than a specific limit value, the calibration is successful, the calibration scale factor is written into the sensor to be calibrated, and meanwhile, a corresponding calibration scale report is generated. Because the calibration can be carried out on a plurality of sensors to be calibrated at the same time, each sensor to be calibrated can be marked with numbers for distinguishing.

It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.