Instrument verification method and instrument verification device

Abstract

The application provides an instrument calibration method and an instrument calibration device. The instrument calibration method comprises the following steps: obtaining a detection pressure point, obtaining a pressure regulating ratio of a pressure regulating piston, obtaining a range of a first measurement module, determining a first range according to the range of the first measurement module, determining a second range according to the range of the first measurement module and the pressure regulating ratio, judging according to the detection pressure point, the first range and the second range, determining a first target pressure value, if the detection pressure point is within the second range, the first target pressure value is equal to the product of the detection pressure point and the pressure regulating ratio, if the detection pressure point value exceeds the second range, the first target pressure value is equal to the detection pressure point, and controlling the first pressure control part and the second pressure control part according to the first target pressure value and a first pressure measurement value, so that the first pressure measurement value reaches the first target pressure value. Through the instrument calibration method, the accuracy of the measurement module in a small range can be improved, and the instrument calibration device has better pressure control effect.

Description

Technical Field

[0001] This application relates to the technical field of pressure testing, specifically, to an instrument calibration method and instrument calibration device for testing pressure instruments under test. Background Technology

[0002] Instrument calibration devices, also known as pressure calibration instruments, are used to test pressure instruments such as pressure gauges, pressure transmitters, and pressure switches.

[0003] The instrument calibration device is equipped with a measurement module, and the range and accuracy of the instrument calibration device are affected by the measurement module.

[0004] When a measurement module with a larger range is used to measure the pressure of a medium with a smaller range, the measurement module cannot maintain its original accuracy within the smaller range, which affects the pressure control effect of the instrument calibration device within the smaller range. Summary of the Invention

[0005] This application provides an instrument calibration method and an instrument calibration device, which can improve the accuracy of the measuring module within a small range and enable the instrument calibration device to have better pressure control effect.

[0006] An instrument calibration method, applied to an instrument calibration device, wherein,

[0007] The instrument calibration device includes a first pressure control unit, a second pressure control unit, a pressure regulating cylinder, a first pressure output port, a second pressure output port, a first measurement module, and a control module. The first pressure control unit is used to control the liquid medium to adjust the medium pressure at the output end of the first pressure control unit. The second pressure control unit is used to control the gas medium to adjust the medium pressure at the output end of the second pressure control unit. The pressure regulating cylinder is equipped with a pressure regulating piston, which divides the pressure regulating cylinder into a first pressure regulating chamber and a second pressure regulating chamber that are sealed to each other. The first pressure regulating chamber is connected to the output end of the first pressure control unit, and the second pressure regulating chamber is connected to the output end of the second pressure control unit. The pressure regulating piston has a first force-bearing area in the first pressure regulating chamber and a second force-bearing area in the second pressure regulating chamber. The first force-bearing area is smaller than the second force-bearing area, and the ratio between the two is fixed. The first pressure output port is connected to the first pressure regulating chamber, and the second pressure output port is connected to the second pressure regulating chamber. The first measurement module is connected to the first pressure output port and is used to measure the medium pressure at the first pressure output port.

[0008] Instrument calibration methods include:

[0009] The control module acquires the detection pressure point, which is used to test the pressure gauge under test;

[0010] The control module obtains the pressure regulation ratio of the pressure regulating piston, which is equal to the ratio of the medium pressure in the first pressure regulating chamber to the medium pressure in the second pressure regulating chamber.

[0011] The control module obtains the range of the first measuring module, determines the first range based on the range of the first measuring module, and determines the second range based on the range of the first measuring module and the voltage regulation ratio. The first range is greater than the second range, and the accuracy class of the first range and the second range is the same.

[0012] The control module determines the first target pressure value based on the detected pressure point, the first range, and the second range. If the detected pressure point is within the second range, the first target pressure value is equal to the product of the detected pressure point and the pressure adjustment ratio. The second pressure output port is used to connect to the pressure instrument under test. If the detected pressure point value exceeds the second range but is within the first range, the first target pressure value is equal to the detected pressure point. The first pressure output port is used to connect to the pressure instrument under test.

[0013] The control module controls the first pressure control unit and the second pressure control unit according to the first target pressure value and the first pressure measurement value of the first measurement module, so that the first pressure measurement value reaches the first target pressure value;

[0014] The pressure gauge under test measures the pressure of the medium provided by the instrument calibration device, generates a test value, processes the test value and the test pressure point, and obtains the test result.

[0015] In one preferred embodiment:

[0016] The first pressure regulating chamber is connected to the output end of the first pressure control unit, including that the first pressure regulating chamber is connected to one end of the shut-off valve, and the other end of the shut-off valve is connected to the output end of the first pressure control unit. When the shut-off valve is in the open state, the first pressure regulating chamber and the output end of the first pressure control unit are in a connected state. When the shut-off valve is in the closed state, the first pressure regulating chamber and the output end of the first pressure control unit are in a disconnected state.

[0017] The aforementioned control module controls the first pressure control unit and the second pressure control unit based on the first target pressure value and the first pressure measurement value from the first measurement module, including:

[0018] A first pressure threshold is obtained based on a first target pressure value, and the first pressure threshold is less than the first target pressure value;

[0019] The control shut-off valve is in the open state, which controls the first pressure control unit and the second pressure control unit to increase the first pressure measurement value until the first pressure measurement value reaches the first pressure threshold.

[0020] The control valve changes from the open state to the closed state, controlling the second pressure control unit to increase the first pressure measurement value until the first pressure measurement value reaches the first target pressure value.

[0021] In one preferred embodiment:

[0022] The instrument calibration device also includes a liquid storage chamber and a first pressurization mechanism. The liquid storage chamber is used to store liquid media, and the first pressurization mechanism is used to pressurize the liquid media. The input end of the first pressurization mechanism is connected to the liquid storage chamber, and the output end of the first pressurization mechanism is connected to the input end of the first pressure control unit.

[0023] The control shut-off valve is in the open state, and the first pressure control unit and the second pressure control unit are controlled to increase the first pressure measurement value. This includes activating the first pressure boosting mechanism to supply pressurized liquid medium to the input end of the first pressure control unit.

[0024] The control valve changes from the open state to the closed state, controlling the second pressure control unit, including controlling the first pressurization mechanism to stop supplying liquid medium.

[0025] In one preferred embodiment:

[0026] The first pressure control unit includes a first pressure control valve. One end of the first pressure control valve is connected to the output end of the first pressure control unit, and the other end of the first pressure control valve is connected to the liquid storage chamber. When the first pressure control valve is in the open state, the output end of the first pressure control unit is connected to the liquid storage chamber. When the first pressure control valve is in the closed state, the output end of the first pressure control unit is disconnected from the liquid storage chamber.

[0027] The control shut-off valve is in the open state, and the first pressure control unit and the second pressure control unit are controlled to increase the first pressure measurement value, including controlling the first pressure control valve to be in the closed state;

[0028] The control shut-off valve changes from the open state to the closed state to control the second pressure control unit, including controlling the first pressure control valve to be in the open state so that the liquid medium in the first pressure control unit flows into the liquid storage chamber.

[0029] In one preferred embodiment:

[0030] The instrument calibration device also includes a first gas storage chamber, a second pressurizing mechanism, a second measuring module, and a fourth measuring module. The first gas storage chamber is used to store a gas medium with positive pressure. The first gas storage chamber is connected to the first input terminal of the second pressure control unit. The second pressurizing mechanism is used to pressurize the gas medium to output a gas medium with positive pressure. The output terminal of the second pressurizing mechanism is connected to the first gas storage chamber. The second measuring module is used to measure the medium pressure in the first gas storage chamber. The second measuring module is connected to the first gas storage chamber. The fourth measuring module is used to measure the medium pressure in the second pressure regulating chamber. The fourth measuring module is connected to the second pressure regulating chamber.

[0031] Instrument calibration methods also include,

[0032] The control module acquires a second pressure threshold and a third pressure threshold, wherein the second pressure threshold is greater than the third pressure threshold.

[0033] The control module acquires the second pressure measurement value from the second measurement module;

[0034] The control module acquires the fourth pressure measurement value from the fourth measurement module;

[0035] The control module makes a judgment based on the second pressure measurement value and the fourth pressure measurement value. If the second pressure measurement value is less than the sum of the fourth pressure measurement value and the third pressure threshold, it controls the second pressurization mechanism to provide pressurized gas medium to the first gas storage chamber, so that the medium pressure in the first gas storage chamber increases until the second pressure measurement value is equal to the sum of the fourth pressure measurement value and the second pressure threshold. If the second pressure measurement value is greater than or equal to the sum of the fourth pressure measurement value and the second pressure threshold, it controls the second pressurization mechanism to stop providing gas medium.

[0036] In one preferred embodiment:

[0037] The instrument calibration device also includes a second gas storage chamber, a vacuum pump, a third measuring module, and a fourth measuring module. The second gas storage chamber is used to store a gas medium with negative pressure. The second gas storage chamber is connected to the second input terminal of the second pressure control unit, which is used to control the gas medium. The inlet terminal of the vacuum pump is connected to the second gas storage chamber, which is used to extract the gas medium from the second gas storage chamber to make the medium pressure in the second gas storage chamber negative. The third measuring module is used to measure the medium pressure in the second gas storage chamber and is connected to the second gas storage chamber. The fourth measuring module is used to measure the medium pressure in the second pressure regulating chamber and is connected to the second pressure regulating chamber.

[0038] Instrument calibration methods also include,

[0039] The control module acquires a second pressure threshold and a third pressure threshold, wherein the second pressure threshold is greater than the third pressure threshold.

[0040] The control module acquires the third pressure measurement value from the third measurement module;

[0041] The control module acquires the fourth pressure measurement value from the fourth measurement module;

[0042] The control module makes a judgment based on the third and fourth pressure measurements. If the third pressure measurement is greater than the sum of the fourth pressure measurement and the second pressure threshold, it controls the vacuum pump to extract the gas medium from the second gas storage chamber, thereby reducing the medium pressure in the second gas storage chamber until the third pressure measurement equals the sum of the fourth pressure measurement and the third pressure threshold. If the third pressure measurement is less than or equal to the sum of the fourth pressure measurement and the third pressure threshold, it controls the vacuum pump to stop extracting the gas medium from the second gas storage chamber.

[0043] In one preferred embodiment:

[0044] The second pressure control unit includes a second pressure control valve and a third pressure control valve. One end of the second pressure control valve is used to connect to a device that provides a gas medium with positive pressure, and the other end of the second pressure control valve is connected to the output end of the second pressure control unit. One end of the third pressure control valve is used to connect to a device that provides atmospheric pressure or negative pressure, and the other end of the third pressure control valve is connected to the output end of the second pressure control unit.

[0045] The control module is connected to the first pressure control unit, the second pressure control unit, and the first measurement module, respectively. The control module is connected to the second pressure control valve and the third pressure control valve, respectively. The control module is used to control the opening and closing of the second pressure control valve and the third pressure control valve according to the first pressure measurement value of the first measurement module.

[0046] The aforementioned control module controls the first pressure control unit and the second pressure control unit based on the first target pressure value and the first pressure measurement value from the first measurement module, including:

[0047] If the first pressure measurement value is greater than the first target pressure value, close the second pressure control valve or reduce the opening range of the second pressure control valve, open the third pressure control valve or increase the opening range of the third pressure control valve, so that the first pressure measurement value is reduced to the first target pressure value;

[0048] If the first pressure measurement value is less than the first target pressure value, open the second pressure control valve or increase the opening range of the second pressure control valve, close the third pressure control valve or decrease the opening range of the third pressure control valve, so that the first pressure measurement value rises to the first target pressure value.

[0049] In one preferred embodiment:

[0050] The instrument calibration device also includes a fourth measurement module, which is connected to the second pressure regulating chamber and is used to measure the medium pressure in the second pressure regulating chamber.

[0051] The control module obtains the range of the fourth measurement module, determines the third range based on the range of the fourth measurement module, the third range is greater than the second range and less than the first range, and determines the fourth range based on the range of the fourth measurement module and the voltage regulation ratio, the fourth range is greater than the first range.

[0052] The control module determines the second target pressure value based on the detected pressure point, the first range, the second range, the third range, and the fourth range. If the detected pressure point exceeds the second range but is within the third range, the second target pressure value is equal to the detected pressure point, and the second pressure output port is used to connect to the pressure gauge under test. If the detected pressure point exceeds the first range but is within the fourth range, the second target pressure value is equal to the product of the detected pressure point and the pressure adjustment ratio, and the first pressure output port is used to connect to the pressure instrument under test.

[0053] The control module controls the first pressure control unit and the second pressure control unit according to the second target pressure value and the fourth pressure measurement value of the fourth measurement module, so that the fourth pressure measurement value reaches the second target pressure value.

[0054] In one preferred embodiment:

[0055] The aforementioned control module obtains the pressure adjustment ratio of the pressure regulating piston, including controlling the first pressure control unit and the second pressure control unit so that the first pressure measurement value and the fourth pressure measurement value are in one of pressure increase or pressure decrease.

[0056] At the first moment, obtain the first pressure measurement value P. 11 Obtain the fourth pressure measurement value P at that moment. 14 ;

[0057] At the second moment, obtain the first pressure measurement value P at the second moment. 21 Obtain the fourth pressure measurement value P at that moment. 24 ;

[0058] Calculate the pressure regulating ratio k of the pressure regulating piston, so that...

[0059] In one preferred embodiment:

[0060] The instrument calibration device also includes a data acquisition module and a detection and processing module. The data acquisition module has at least one channel unit, which is used to connect to the pressure instrument under test to acquire the signal to be measured from the pressure instrument under test. The data acquisition module also has at least one signal analysis unit, which is connected to the channel unit. The signal analysis unit is used to analyze the acquired signal to be measured and generate the measured value. The detection and processing module is connected to the signal analysis unit, the control module and the first measurement module respectively.

[0061] Instrument calibration methods also include:

[0062] The detection and processing module obtains the target pressure value and the corresponding detection pressure point from the control module.

[0063] When the first pressure measurement value reaches the target pressure value, the detection processing module obtains the measured value from the signal analysis unit and generates the detection result based on the detection pressure point and the measured value.

[0064] An instrument calibration device includes a computer-readable storage medium storing instructions that, when executed on the instrument calibration device, cause the instrument calibration device to perform any of the aforementioned instrument calibration methods and preferred embodiments.

[0065] This application provides an instrument calibration method and an instrument calibration device. On the one hand, when the medium pressure is provided through the first pressure output port, the first measuring module can measure the medium pressure based on the original range and accuracy class. On the other hand, when the medium pressure is provided through the second pressure output port, the first measuring module can measure the medium pressure based on a smaller range and the original accuracy class through the switching of the pressure regulating cylinder, thereby improving the measurement accuracy of the medium pressure. When using the medium pressure for pressure detection, the accuracy of the pressure detection results can be improved. Attached Figure Description

[0066] Figure 1 This is a connection diagram of an instrument calibration device, one of the examples in this application.

[0067] Figure 2 This is a connection diagram of an instrument calibration device, one of the examples in this application.

[0068] Figure 3 This is a flowchart illustrating the instrument calibration method exemplified in this application.

[0069] Figure 4 This is a connection diagram of the instrument calibration device in Example 2 of this application.

[0070] Figure 5 This is a connection diagram of the instrument calibration device in Example 2 of this application.

[0071] Figure label:

[0072] 100. First pressure control unit; 101. Input terminal of the first pressure control unit; 102. Output terminal of the first pressure control unit; 110. First pressure control valve; 200. Second pressure control unit; 201. First input terminal of the second pressure control unit; 202. Second input terminal of the second pressure control unit; 203. Output terminal of the second pressure control unit; 210. Second pressure control valve; 220. Third pressure control valve; 300. Pressure regulating cylinder; 310. First pressure regulating chamber; 320. Second pressure regulating chamber; 330. Pressure regulating piston; 410. First pressure output port. 420, Second pressure output port; 510, First measurement module; 520, Second measurement module; 530, Third measurement module; 540, Fourth measurement module; 610, Control module; 620, Acquisition module; 621, Channel unit; 622, Signal analysis unit; 630, Detection and processing module; 710, Liquid storage chamber; 720, First pressurization mechanism; 730, Shut-off valve; 810, First gas storage chamber; 820, Second pressurization mechanism; 910, Second gas storage chamber; 920, Vacuum pump. Detailed Implementation

[0073] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0074] Accuracy refers to the degree to which the measured pressure value matches the true pressure value after multiple measurements under certain experimental conditions. It can be used to represent the magnitude of the error. Generally, the higher the accuracy level, the closer the measured pressure value matches the true pressure value; the lower the accuracy level, the further the measured pressure value deviates from the true pressure value.

[0075] The measuring range refers to the measurement range of an instrument calibration device or its measuring module. Generally, the measuring range includes an upper limit and a lower limit. Pressure values ​​between the upper and lower limits are within the measuring range, while pressure values ​​below the lower limit or above the upper limit are outside the measuring range.

[0076] The allowable error, also known as the error limit, refers to the maximum range of error guaranteed by a certain probability. It can characterize the degree to which the measured pressure value matches the true pressure value. Generally, the larger the allowable error, the closer the measured pressure value matches the true pressure value; the smaller the allowable error, the further the measured pressure value deviates from the true pressure value.

[0077] For a measurement module, its range and accuracy class are generally fixed, and correspondingly, the allowable error is also fixed. For example, if the range is 0-1MPa and the accuracy class is 0.1, then its allowable error is equal to 1kPa.

[0078] An instrument calibration method is applied to an instrument calibration device, which can also be called an instrument calibration apparatus, pressure calibrator, etc., and is used to test pressure instruments.

[0079] refer to Figure 1 and Figure 2 As shown, the instrument calibration device includes a first pressure control unit 100, a second pressure control unit 200, a pressure regulating cylinder 300, a first pressure output port 410, a second pressure output port 420, a first measurement module 510, and a control module 610.

[0080] The first pressure control unit 100 is used to control the liquid medium to adjust the medium pressure at the output terminal 102 of the first pressure control unit 100. Specifically, the first pressure control unit 100 can have a built-in liquid storage chamber or be connected to an external liquid storage chamber. The external liquid storage chamber can be included in the instrument calibration device or not. When the external liquid storage chamber and the first pressure control unit 100 are disconnected, the two can be connected through a pipeline. The first pressure control unit 100 can draw liquid medium from the liquid storage chamber, control the liquid medium, and adjust the pressure of the liquid medium so that a pressurized liquid medium is provided from the output terminal 102 of the first pressure control unit 100. In some cases, the first pressure control unit 100 can be used to pre-pressurize the liquid medium. During the pre-pressurization process, the first pressure control unit 100 controls the medium pressure at its output end according to the target pressure value until the medium pressure is close to the target pressure value, for example, the medium pressure reaches the range of 80%-120% of the target pressure value. In some cases, the accuracy class of the first pressure control unit 100 may be lower than the accuracy class of the second pressure control unit 200. In some cases, for example, under the pre-pressurization control of the first pressure control unit 100, the first pressure control unit 100 outputs at maximum power, and the medium pressure at its output end is less than the target pressure value.

[0081] The second pressure control unit 200 is used to control the gas medium to adjust the medium pressure at its output terminal 203. Specifically, the second pressure control unit 200 can have a built-in pressure boosting mechanism or be connected to an external pressure boosting mechanism. The second pressure control unit 200 may also include pressure control mechanisms such as a pressure control valve assembly to control the pressure provided by the pressure boosting mechanism and adjust the pressure of the gas medium. For example, when the medium pressure at the output terminal 203 of the second pressure control unit 200 is greater than the desired pressure value, the inflow of gas medium is reduced and the outflow of gas medium is increased. Conversely, when the medium pressure at the output terminal 203 of the second pressure control unit 200 is less than the desired pressure value, the inflow of gas medium is increased and the outflow of gas medium is reduced, thereby ensuring that the medium pressure at the output terminal 203 of the second pressure control unit 200 reaches the desired pressure value. In some cases, the accuracy class of the first pressure control unit 100 may be higher than that of the second pressure control unit 200. Depending on the pressure regulation ratio of the pressure regulating cylinder 300, there can be a proportional relationship between the desired pressure value and the target pressure value. When the pressure regulation ratio of the pressure regulating cylinder 300 is 1, the desired pressure value can be equal to the target pressure value.

[0082] The pressure regulating cylinder 300 is provided with a pressure regulating piston 330. The pressure regulating piston 330 divides the pressure regulating cylinder 300 into a first pressure regulating chamber 310 and a second pressure regulating chamber 320 that are sealed to each other. The first pressure regulating chamber 310 is connected to the output end 102 of the first pressure control unit 100, and the second pressure regulating chamber 320 is connected to the output end 203 of the second pressure control unit 200. Specifically, the pressure regulating cylinder 300 forms a pressure-bearing chamber inside, and the pressure regulating piston 330 is disposed inside the pressure regulating cylinder 300. The pressure regulating piston 330 and the inner wall of the pressure regulating cylinder 300 are sealed together, thereby dividing the pressure regulating cylinder 300 into a first pressure regulating chamber 310 and a second pressure regulating chamber 320 that are sealed to each other. The first pressure regulating chamber 310 is connected to the output end 102 of the first pressure control unit 100. The pressurized liquid medium provided by the first pressure control unit 100 can enter the first pressure regulating chamber 310. In some cases, under pre-pressurization, the liquid medium fills the first pressure regulating chamber 310 after pre-pressurization. The second pressure regulating chamber 320 is connected to the output end 203 of the second pressure control unit 200. The pressurized gas medium provided by the second pressure control unit 200 can enter the second pressure regulating chamber 320. During the pressure control process using the second pressure control unit 200, the gas medium will fill the second pressure regulating chamber 320.

[0083] The liquid medium in the first pressure regulating chamber 310 applies a first pressure to the pressure regulating piston 330, and the gas medium in the second pressure regulating chamber 320 applies a second pressure to the pressure regulating piston 330. When the first pressure is greater than the second pressure, the pressure regulating piston 330 is driven by the pressure and moves towards the second pressure regulating chamber 320, thereby increasing the volume of the first pressure regulating chamber 310 and decreasing the volume of the second pressure regulating chamber 320 until the first pressure equals the second pressure. When the second pressure is greater than the first pressure, since the liquid medium is incompressible, the second pressure is transmitted to the liquid medium through the pressure regulating piston 330, increasing the pressure of the liquid medium until the first pressure equals the second pressure.

[0084] The pressure regulating piston 330 has a first force-receiving area in the first pressure regulating chamber 310 and a second force-receiving area in the second pressure regulating chamber 320. The first force-receiving area is smaller than the second force-receiving area, and the ratio between the two is fixed. The force-bearing area mentioned in this application refers to the effective area capable of driving the pressure regulating piston 330 to move. Let the contact position between the pressure regulating piston 330 and the first pressure regulating chamber 310 be the first contact surface. If the first contact surface and the force-bearing movement direction of the pressure regulating piston 330 are perpendicular to each other, then the area of ​​the first contact surface is the first force-bearing area. If the first contact surface and the force-bearing movement of the pressure regulating piston 330 are not perpendicular, let the surface perpendicular to the force-bearing movement direction of the pressure regulating piston 330 be the force-bearing surface, and the projected area of ​​the first contact surface on the force-bearing surface is the first force-bearing area. Let the contact position between the pressure regulating piston 330 and the second pressure regulating chamber 320 be the second contact surface. If the second contact surface and the force-bearing movement direction of the pressure regulating piston 330 are perpendicular to each other, then the area of ​​the second contact surface is the second force-bearing area. If the second contact surface and the force-bearing movement of the pressure regulating piston 330 are not perpendicular, then the projected area of ​​the second contact surface on the force-bearing surface is the second force-bearing area.

[0085] After the pressure regulating piston 330 is set in the instrument calibration device, the ratio of the first force-bearing area and the second force-bearing area is fixed. For ease of description, the medium pressure in the first pressure regulating chamber 310 is denoted as the first medium pressure, and the medium pressure in the second pressure regulating chamber 320 is denoted as the second medium pressure. Since the first force-bearing area is smaller than the second force-bearing area, for example, the pressure ratio of the first force-bearing area and the second force-bearing area is 1:5, when the pressure on both sides of the pressure regulating piston 330 is stable, the ratio of the first medium pressure to the second medium pressure is 5:1.

[0086] The first pressure output port 410 is connected to the first pressure regulating chamber 310 to provide pressure to the pressure instrument through a liquid medium. Specifically, the first pressure output port 410 is used to connect with the pressure instrument under test (hereinafter referred to as the instrument under test for ease of description and to more clearly reflect the role of the pressure instrument in the pressure testing process). Since the first pressure output port 410 is connected to the first pressure regulating chamber 310, the liquid medium in the first pressure regulating chamber 310 can be output through the first pressure output port 410 and transmitted to the instrument under test through pipelines and other connecting structures.

[0087] The second pressure output port 420 is connected to the second pressure regulating chamber 320 to provide pressure to the pressure gauge via a gaseous medium. The second pressure output port 420 provides the instrument calibration device with a pressure output port that can provide the pressure of a gaseous medium. Based on this design, when testing the instrument under test, if the instrument requires gaseous medium testing, it can be connected to the second pressure output port 420; if the instrument requires liquid medium testing, it can be connected to the first pressure output port 410.

[0088] The first measurement module 510 is connected to the first pressure output port 410 and is used to measure the pressure of the medium at the first pressure output port 410. Specifically, the first measurement module 510 can be a pressure sensor, a pressure module encapsulated with a pressure sensor, or other components or devices with pressure measurement capabilities. Generally, to improve the accuracy of the test results, the accuracy class of the first measurement module 510 is higher than the accuracy class of the instrument under test. Since the first measurement module 510 is connected to the first pressure output port 410, the liquid medium at the first pressure output port 410 can be transmitted to the pressure-sensing pipeline of the first measurement module 510, and then sensed and measured by the pressure-sensing part of the first measurement module 510 to generate a pressure measurement value. The pressure measurement value generated by the first measurement module 510 can be an analog signal or a digital signal. The information meaning of the pressure measurement value can be expressed as a pressure value or in other forms that reflect the pressure value. In some cases, if the pressure measurement value is generated in real time, it can be used to express the real-time pressure value of the first pressure output port 410.

[0089] The control module 610 may include one or more components such as a microcontroller, one or more processors, a memory, a circuit board for setting electronic components, and connecting circuits. The control module 610 is coupled to the first measurement module 510. Based on this coupling, the control module 610 can obtain a first pressure measurement value from the first measurement module 510 and process the first pressure measurement value according to a preset computer program. The control module 610 is also coupled to the first pressure control unit 100. Based on this coupling, the control module 610 can control the first pressure control unit 100, thereby controlling the medium pressure at the output terminal 102 of the first pressure control unit 100. Furthermore, according to a preset computer program, the control module 610 can control the first pressure control unit 100 based on the first pressure measurement value of the first measurement module 510; the control module 610 is coupled to the second pressure control unit 200, and based on this coupling connection, the control module 610 can control the second pressure control unit 200, thereby controlling the medium pressure at the output terminal 203 of the second pressure control unit 200, and then controlling the medium pressure in the first pressure regulating chamber 310 through the pressure regulating cylinder 300; furthermore, according to a preset computer program, the control module 610 can control the second pressure control unit 200 based on the first pressure measurement value of the first measurement module 510.

[0090] Reference Figure 3 As shown, based on the aforementioned instrument calibration device, the following instrument calibration method can be implemented, which includes:

[0091] S110 and control module 610 acquire the detection pressure point, which is used to test the pressure gauge under test.

[0092] Before testing the pressure gauge under test, the test pressure point can be determined according to the testing requirements and characteristics of the pressure gauge itself. Generally, the test pressure point can represent a certain point or range of the pressure gauge under test. The test pressure point can be the upper or lower limit of the range of the pressure gauge under test, or it can be a point in the range of the pressure gauge under test.

[0093] S120, the control module 610 obtains the pressure regulation ratio of the pressure regulating piston, the pressure regulation ratio is equal to the ratio of the medium pressure in the first pressure regulating chamber to the medium pressure in the second pressure regulating chamber.

[0094] The pressure regulation ratio can be obtained by measuring and storing it in the control module 610 before leaving the factory, or by measuring it before testing. For example, when the medium pressure in the first pressure regulating chamber and the medium pressure in the second pressure regulating chamber are both stable (preferably, the pressure value reached by one of the medium pressures is the aforementioned detection pressure point), the medium pressure in the first pressure regulating chamber is measured to obtain p. 01 The medium pressure in the second pressure regulating chamber is measured to obtain p. 02 Then the voltage regulation ratio f = p 01 / p 02 Based on the foregoing analysis, if we assume the first force-bearing area of ​​the pressure-regulating piston in the first pressure-regulating chamber is s... 01 Let the second force-bearing area of ​​the pressure regulating piston in the second pressure regulating chamber be s. 02 Then the voltage regulation ratio f = s 02 / s 01 Since the first and second pressure-bearing areas are difficult to measure accurately, the pressure regulation ratio is usually calculated based on the medium pressure. S120 can occur before, during, or after S110.

[0095] S130, the control module 610 obtains the range of the first measurement module 510, determines the first range based on the range of the first measurement module 510, and determines the second range based on the range of the first measurement module 510 and the voltage regulation ratio. The first range is greater than the second range, and the accuracy class of the first range and the second range is the same.

[0096] For ease of description, f represents the voltage regulation ratio. After the first measurement module 510 and the control module 610 establish a connection, the control module 610 can obtain the range and accuracy information of the first measurement module 510. The control module 610 can also be input with the range and accuracy information of the first measurement module 510 through other means. Based on the range and accuracy information of the first measurement module 510 and the voltage regulation ratio, the first range and the second range can be determined. For example, if the range of the first measurement module 510 is 0-1MPa, the accuracy class of the first measurement module 510 is 0.05, and the voltage regulation ratio f = 10, then the first range is 0-1MPa, the corresponding accuracy class is 0.05, which is equivalent to an allowable error of 500Pa, and the second range is 0-100kPa, the corresponding accuracy class is also 0.05, which is equivalent to an allowable error of 50Pa. S130 occurs after S120, and S130 can occur before, during, or after S110.

[0097] S210 and control module 610 determine the first target pressure value based on the detected pressure point, the first range, and the second range. If the detected pressure point is within the second range, the first target pressure value is equal to the product of the detected pressure point and the pressure adjustment ratio. The second pressure output port 420 is used to connect to the pressure instrument under test. If the detected pressure point value exceeds the second range but is within the first range, the first target pressure value is equal to the detected pressure point. The first pressure output port 410 is used to connect to the pressure instrument under test.

[0098] Based on the situation in S130, although the accuracy classes of the first and second ranges are the same, the allowable error corresponding to the second range is also smaller due to its smaller size. In some cases, if the detected pressure point falls within the range of the second range, providing the medium pressure from the second pressure output port 420 with the second range can yield a more accurate detection result. Furthermore, since the first target pressure value is compared with the first measurement module, in this case, the first target pressure value is equal to the product of the detected pressure point and the pressure adjustment ratio. In other cases, if the detected pressure point exceeds the range of the second range, providing the medium pressure from the first pressure output port 410 with the first range can yield a more accurate detection result. Furthermore, since the first target pressure value is compared with the first measurement module, in this case, the first target pressure value is equal to the detected pressure point. S210 occurs after S110 and S130.

[0099] S310, the control module controls the first pressure control unit and the second pressure control unit according to the first target pressure value and the first pressure measurement value of the first measurement module, so that the first pressure measurement value reaches the first target pressure value.

[0100] The following is a possible scenario: The instrument calibration device is activated, and the first pressure control unit 100 performs pre-pressure. The first pressure control unit 100 inputs a liquid medium into the first pressure regulating chamber 310. If gas is present in the first pressure regulating chamber 310, the liquid medium will expel the gas, continuously controlling the first pressure control unit 100. The pre-pressure process is completed based on the first pressure measurement value at the first pressure output port 410. If the first pressure measurement value reaches the first pressure threshold, the pre-pressure process is complete. The first pressure threshold can be a pressure value or a range of pressure values ​​determined based on the first target pressure value, for example, 60%-140% of the first target pressure value. Generally, during startup, if the medium pressure at the output port 102 of the first pressure control unit 100 increases from low to high, the first pressure threshold is less than the first target pressure value. Conversely, if the medium pressure at the output port 102 of the first pressure control unit 100 decreases from high to low, the first pressure threshold is greater than the first target pressure value. When the pre-pressurization process is completed, it can generally be assumed that the liquid medium has purged the gas from the first pressure control unit 100, the first pressure regulating chamber 310, the first pressure output port 410, and the connecting structures between the parties. After the pre-pressurization process is completed, the first pressure control unit 100 no longer controls the pressure of the liquid medium. This cessation of control can be achieved through valve isolation or other implementation methods. During the aforementioned pre-pressurization process, the second pressure control unit 200 can be started simultaneously or slightly later. After the pre-pressurization process stops, the second pressure control unit 200 continues to control the pressure of the gas medium. If the current medium pressure at the first pressure output port 410 is less than the first target pressure value, the second pressure control unit 200 can control its output end to continue filling the second pressure regulating chamber 320 with gas medium. Due to the incompressibility of the liquid medium, the volume of the second pressure regulating chamber 320 remains unchanged, so the medium pressure in the second pressure regulating chamber 320 will increase with the filling of the gas medium. If the current medium pressure at the first pressure output port 410 is greater than the first target pressure value, the second pressure control unit 200 can control the output terminal to draw out the gas medium from the second pressure regulating chamber 320. Similarly, due to the incompressibility of the liquid medium, the volume of the second pressure regulating chamber 320 remains unchanged. Therefore, the medium in the second pressure regulating chamber 320 will decrease as the gas medium is drawn out. This process continues until the current medium pressure at the first pressure output port 410 is equal to the first target pressure value, which means that the first pressure measurement value of the first measurement module 510 is equal to the first target pressure value.

[0101] When the first pressure measurement value equals the first target pressure value, if a liquid medium is supplied to the pressure gauge under test through the first pressure output port 410, the first pressure output port 410 is connected to the pressure gauge under test, and the current medium pressure of the first pressure output port 410 can be transmitted to the pressure gauge under test. The pressure gauge under test measures the medium pressure of the liquid medium, and the pressure gauge under test can be tested based on the measurement result. If a gaseous medium is supplied to the pressure gauge under test through the second pressure output port 420, the second pressure output port 420 is connected to the pressure gauge under test, and the current medium pressure of the second pressure output port 420 can be transmitted to the pressure gauge under test. The pressure gauge under test measures the medium pressure of the gaseous medium, and the pressure gauge under test can be tested based on the measurement result.

[0102] The pressure gauge under test measures the pressure of the medium provided by the instrument calibration device, generates a test value, processes the test value and the test pressure point, and obtains the test result.

[0103] Reference Figure 4 and Figure 5 As shown, in some cases of this example, the instrument calibration device and pressure testing method can be further improved.

[0104] The aforementioned first pressure regulating chamber 310 is connected to the output terminal 102 of the first pressure control unit 100. This includes the first pressure regulating chamber 310 being connected to one end of the shut-off valve 730, and the other end of the shut-off valve 730 being connected to the output terminal 102 of the first pressure control unit 100. When the shut-off valve 730 is open, the first pressure regulating chamber 310 and the output terminal 102 of the first pressure control unit 100 are in a connected state. When the shut-off valve 730 is closed, the first pressure regulating chamber 310 and the output terminal 102 of the first pressure control unit 100 are in a disconnected state.

[0105] The shut-off valve 730 is a valve with a shut-off function. When the shut-off valve 730 is in the closed state, it prevents the passage of liquid medium. When the shut-off valve 730 is in the open state, it allows the passage of liquid medium. One end of the shut-off valve 730 is connected to the first pressure regulating chamber 310, and the other end is connected to the output end 102 of the first pressure control unit 100. Since the shut-off valve 730 is located in the medium transmission channel between the output end 102 of the first pressure control unit 100 and the first pressure regulating chamber 310, and the output end 102 of the first pressure control unit 100 and the first pressure regulating chamber 310 are located at different ends of the shut-off valve 730, the liquid medium needs to pass through the shut-off valve 730 to be transmitted between the output end 102 of the first pressure control unit 100 and the first pressure regulating chamber 310.

[0106] When the shut-off valve 730 is open, it allows the liquid medium to pass through, and the first pressure regulating chamber 310 is in communication with the output end 102 of the first pressure control unit 100. At this time, the liquid medium can be transmitted between the output end 102 of the first pressure control unit 100 and the first pressure regulating chamber 310, and the medium pressure at the output end 102 of the first pressure control unit 100 can also be transmitted to the liquid medium in the first pressure regulating chamber 310. When the shut-off valve 730 is closed, it prevents the liquid medium from passing through and also prevents the transmission of medium pressure. The first pressure regulating chamber 310 is disconnected from the output end 102 of the first pressure control unit 100. At this time, the liquid medium cannot be transmitted between the output end 102 of the first pressure control unit 100 and the first pressure regulating chamber 310, and the medium pressure at the output end 102 of the first pressure control unit 100 will not affect the liquid medium in the first pressure regulating chamber 310.

[0107] Based on the aforementioned instrument calibration device, the instrument calibration method can be improved.

[0108] The aforementioned control module 610 controls the first pressure control unit 100 and the second pressure control unit 200 based on the first target pressure value and the first pressure measurement value of the first measurement module 510, including:

[0109] A first pressure threshold is obtained based on a first target pressure value, and the first pressure threshold is less than the first target pressure value;

[0110] When the control shut-off valve 730 is in the open state, it controls the first pressure control unit 100 and the second pressure control unit 200 to increase the first pressure measurement value until the first pressure measurement value reaches the first pressure threshold.

[0111] The control shut-off valve 730 changes from the open state to the closed state, controlling the second pressure control unit 200 to increase the first pressure measurement value until the first pressure measurement value reaches the first target pressure value.

[0112] The control module 610 is coupled to the shut-off valve 730. Based on this coupling, the control module 610 can control the shut-off valve 730. Furthermore, since the control module 610 is also coupled to the first measuring module 510, the control module 610 can control the shut-off valve 730 according to the first pressure measurement value of the first measuring module 510. For example, when the first pressure measurement value of the first measuring module 510 is less than the first pressure threshold, the control module 610 controls the shut-off valve 730 to be in the open state, so that the first pressure control unit 10... The medium pressure at the output terminal 102 of the first pressure control unit 100 can be continuously transmitted to the first pressure regulating chamber 310 and the first pressure output port 410, thereby achieving a pressure increase. When the first pressure measurement value of the first measurement module 510 reaches the first pressure threshold, the control module 610 controls the shut-off valve 730 to switch from the open state to the closed state. Subsequently, the medium pressure at the output terminal 203 of the second pressure control unit 200 can be used to control the medium pressure at the first pressure output port 410, without being affected by the medium pressure at the output terminal 102 of the first pressure control unit 100.

[0113] Reference Figure 4 and Figure 5 As shown, in some cases of this example, the instrument calibration device and pressure testing method can be further improved.

[0114] The instrument calibration device also includes a liquid storage chamber 710 and a first pressurization mechanism 720. The liquid storage chamber 710 is used to store liquid media, and the first pressurization mechanism 720 is used to pressurize the liquid media. The input end of the first pressurization mechanism 720 is connected to the liquid storage chamber 710, and the output end of the first pressurization mechanism 720 is connected to the input end 101 of the first pressure control unit 100.

[0115] The liquid storage chamber 710 is used to store liquid media. Specifically, in some cases, a liquid storage tank can be installed inside the instrument calibration device, forming the liquid storage chamber 710 within the tank. The liquid storage chamber 710 can be sealed at its bottom and middle to store liquid media without leakage. The liquid storage chamber 710 can be connected to the atmosphere at its top or upper part. In some cases, the liquid storage chamber 710 can be disassembled. When the liquid storage chamber 710 is removed from the instrument calibration device, liquid media can be added to the liquid storage chamber 710, or the liquid media in the liquid storage chamber 710 can be replaced.

[0116] The first pressurizing mechanism 720 is used to pressurize the liquid medium. The input end of the first pressurizing mechanism 720 is connected to the liquid storage chamber 710, and the output end of the first pressurizing mechanism 720 is connected to the input end 101 of the first pressure control unit 100. Specifically, the first pressurizing mechanism 720 may include a hydraulic pump, a pressurizing cylinder, or other hydraulic pressurizing mechanisms. The input end of the first pressurizing mechanism 720 is connected to the liquid storage chamber 710, so that the liquid medium in the liquid storage chamber 710 can enter the first pressurizing mechanism 720 through the input end of the first pressurizing mechanism 720. After pressurizing the liquid medium, the first pressurizing mechanism 720 provides pressurized liquid medium from its output end. When the first pressurizing mechanism 720 is working, the medium pressure at the output end of the first pressurizing mechanism 720 is greater than the medium pressure at the input end of the first pressurizing mechanism 720. The output end of the first pressurizing mechanism 720 is connected to the input end 101 of the first pressure control unit 100. Therefore, the first pressurizing mechanism 720 can provide pressurized liquid medium to the first pressure control unit 100, thereby facilitating the first pressure control unit 100 to control the liquid medium. In some cases, the medium pressure at the output end of the first pressurizing mechanism 720 is greater than or equal to the medium pressure at the output end 102 of the first pressure control unit 100. The first pressure control unit 100 can control the inflowing liquid medium, thereby controlling the increase of the medium pressure of the first pressure control unit 100, and achieving the purpose of controlling the medium pressure at the output end 102 of the first pressure control unit 100.

[0117] Based on the aforementioned instrument calibration device, the instrument calibration method can be improved.

[0118] When the aforementioned control shut-off valve 730 is in the open state, it controls the first pressure control unit 100 and the second pressure control unit 200 to increase the first pressure measurement value, including activating the first pressure boosting mechanism 720 to supply pressurized liquid medium to the input terminal 101 of the first pressure control unit 100.

[0119] The aforementioned control shut-off valve 730 changes from the open state to the closed state to control the second pressure control unit 200, including controlling the first pressurization mechanism 720 to stop supplying liquid medium.

[0120] The control module 610 is connected to the first pressurizing mechanism 720. The control module 610 controls the first pressurizing mechanism 720 based on the first pressure measurement value from the first measuring module 510. The control module 610 is coupled to the first pressurizing mechanism 720. Based on this coupling connection, the control module 610 can control the first pressurizing mechanism 720. Furthermore, according to a pre-installed computer program, the control module 610 can control the first pressurizing mechanism 720 based on the first pressure measurement value from the first measuring module 510. For example, when pre-pressurization begins, the control module 610 sends first pressurization control information to the first pressurizing mechanism 720. Based on the coupling connection between the control module 610 and the first pressurizing mechanism 720… The first pressurization mechanism 720 can parse the first pressurization control information and start the first pressurization mechanism 720 according to the first pressurization control information. The first pressurization mechanism 720 draws liquid medium from the liquid storage chamber 710 and, after pressurization, provides pressurized liquid medium to the first pressure control unit 100 from the output end of the first pressurization mechanism 720. For example, when the first pressure measurement value of the first measurement module 510 reaches the first pressure threshold, the control module 610 can control the first pressurization mechanism 720 to stop pressurizing.

[0121] Reference Figure 4 and Figure 5 As shown, in some cases of this example, the instrument calibration device and pressure testing method can be further improved.

[0122] The first pressure control unit 100 includes a first pressure control valve 110. One end of the first pressure control valve 110 is connected to the output end 102 of the first pressure control unit 100, and the other end of the first pressure control valve 110 is connected to the liquid storage chamber 710. When the first pressure control valve 110 is open, the output end 102 of the first pressure control unit 100 is connected to the liquid storage chamber 710. When the first pressure control valve 110 is closed, the output end 102 of the first pressure control unit 100 is disconnected from the liquid storage chamber 710.

[0123] The first pressure control valve 110 can be a solenoid valve or other types of valves capable of achieving shut-off pressure control. Generally, the first pressure control valve 110 can be a two-way valve. When the first pressure control valve 110 is used for other purposes, it can also be a three-way valve or a valve with more passages. Taking a two-way valve as an example, the first end of the first pressure control valve 110 is provided with a first valve port, which is connected to the output end 102 of the first pressure control unit 100, thereby realizing the connection between the first pressure control valve 110 and the output end 102 of the first pressure control unit 100. The second end of the first pressure control valve 110 is provided with a second valve port, which is connected to the liquid storage chamber 710, thereby realizing the connection between the first pressure control valve 110 and the liquid storage chamber 710. Since the first end and the second end are different ends of the pressure control valve, the first valve port and the second valve port are also different ports. Therefore, the liquid storage chamber 710 and the output end 102 of the first pressure control unit 100 need to pass through the first pressure control valve 110 to achieve connection.

[0124] Furthermore, the first pressure control valve 110 may have an internal passage, one end of which is connected to the aforementioned first valve port, and the other end of which is connected to the aforementioned second valve port, for realizing the opening and closing state of the valve. The first pressure control valve 110 may also have a valve core inside, which can control the opening and closing of the internal passage. When the valve core is in the closed position, the first pressure control valve 110 is in the closed state, the internal passage is cut off by the valve core, the liquid medium cannot pass through the valve core, and the output end 102 of the first pressure control unit 100 is disconnected from the liquid storage chamber 710. The medium pressure at the output end 102 of the first pressure control unit 100 is not affected by the liquid storage chamber 710. When the valve core is in the open state, the first pressure control valve 110 is in the open state, and the internal passage of the valve is opened. The liquid medium can pass through the internal passage of the valve, and the output end 102 of the first pressure control unit 100 is in a connected state with the liquid storage chamber 710. At this time, if the medium pressure at the output end 102 of the first pressure control unit 100 is greater than the medium pressure in the liquid storage chamber 710, the liquid medium at the output end 102 of the first pressure control unit 100 will flow into the liquid storage chamber 710 until the two pressures are the same.

[0125] Based on the aforementioned instrument calibration device, the instrument calibration method can be improved.

[0126] When the aforementioned control shut-off valve 730 is in the open state, it controls the first pressure control unit 100 and the second pressure control unit 200 to increase the first pressure measurement value, including controlling the first pressure control valve 110 to be in the closed state.

[0127] The aforementioned control shut-off valve 730 changes from the open state to the closed state to control the second pressure control unit 200, including controlling the first pressure control valve 110 to be in the open state so that the liquid medium in the first pressure control unit 200 flows into the liquid storage chamber 710.

[0128] The control module 610 is coupled to the first pressure control valve 110. This coupling connection is at least part of the aforementioned coupling connection between the control module 610 and the first pressure control unit 100. Based on the coupling connection between the control module 610 and the first pressure control valve 110, the control module 610 can control the first pressure control valve 110. Depending on the type of the first pressure control valve 110, the control module 610 can control the opening and closing of the first pressure control valve 110, and can also control the opening range of the first pressure control valve 110. Since the control module 610 is also coupled to the first measurement module 510, the opening and closing of the first pressure control valve 110 can be controlled according to the first pressure measurement value of the first measurement module 510. For example, in the pre-pressurization stage, when the pressure value of the first measurement module 510 is less than the first pressure threshold, the first pressure control valve 110 can be closed. Since the first pressurization mechanism 720 is in a pressurization state, the medium pressure at the output end 102 of the first pressure control unit 100 gradually increases, and correspondingly, the first pressure measurement value of the first measurement module 510 will also increase. As the pressure continues to rise, when the first pressure measurement value of the first measuring module 510 reaches the first pressure threshold, since the shut-off valve 730 is closed, the first pressure control unit 100 has no effect on the first pressure measurement value of the first measuring module 510. The first pressure control valve 110 can be opened. Since the pressure in the liquid storage chamber 710 is lower than the medium pressure at the output end 102 of the first pressure control unit 100, the pressure at the output end 102 of the first pressure control unit 100 will decrease. Theoretically, all the liquid medium in the first pressure control unit 100 can be discharged into the liquid storage chamber 710.

[0129] Reference Figure 4 and Figure 5 As shown, in some cases of this example, the instrument calibration device and pressure testing method can be further improved.

[0130] The instrument calibration device also includes a first air storage chamber 810, a second pressurization mechanism 820, a second measurement module 520, and a fourth measurement module 540.

[0131] The first gas storage chamber 810 is used to store a gaseous medium under positive pressure. The first gas storage chamber 810 is connected to the first input terminal 201 of the second pressure control unit 200, which controls the gaseous medium. The first gas storage chamber 810 can be a chamber formed by a gas tank or other gas storage device. To achieve the gas storage function, the first gas storage chamber 810 is sealed except at necessary communication points to prevent gaseous medium leakage. Since the gaseous medium stored in the first gas storage chamber 810 has positive pressure, the structure forming the first gas storage chamber 810 also has the ability to withstand positive pressure. The first gas storage chamber 810 is connected to the first input terminal 201 of the second pressure control unit 200, thereby allowing the first gas storage chamber 810 to provide a gaseous medium under positive pressure to the second pressure control unit 200. The second pressure control unit 200 is used to control the gas medium, that is, the second pressure control unit 200 controls the gas medium flowing in from its first input terminal, so that the pressure of the gas medium at the output terminal 203 of the second pressure control unit 200 reaches the desired pressure value.

[0132] The second pressurizing mechanism 820 is used to pressurize the gas medium to output a gas medium with positive pressure. The output end of the second pressurizing mechanism 820 is connected to the first gas storage chamber 810. Generally, the second pressurizing mechanism 820 can be an air pump or other equipment with the ability to compress and pressurize gas medium. In some cases, the input end of the second pressurizing mechanism 820 can be connected to the atmosphere, or to a gas cylinder or other container that provides the gas medium. When the second pressurizing mechanism 820 is in operation, it draws in the gas medium from its input end and outputs it from its output end. Since the output end of the second pressurizing mechanism 820 is connected to the first gas storage chamber 810, at least part of the gas medium provided by the second pressurizing mechanism 820 will enter the first gas storage chamber 810. The medium pressure in the first gas storage chamber 810 is greater than or equal to atmospheric pressure. Therefore, the medium pressure of the gas medium provided by the second pressurizing mechanism 820 is also greater than atmospheric pressure, thereby achieving the purpose of filling the first gas storage chamber 810 with gas.

[0133] The second measurement module 520 is connected to the first gas storage chamber 810 and is used to measure the pressure of the medium in the first gas storage chamber 810. The second measurement module 520 can be a pressure sensor, a pressure module encapsulated with a pressure sensor, or other components or devices with pressure measurement capabilities. Since the second measurement module 520 is connected to the first gas storage chamber 810, the gas medium in the first gas storage chamber 810 can enter the pressure-sensing pipeline of the second measurement module 520 and be sensed and measured by the pressure-sensing part of the second measurement module 520, generating a second pressure measurement value. The second pressure measurement value of the second measurement module 520 can be an analog signal or a digital signal. If the second pressure measurement value of the second measurement module 520 is generated in real time, it can be used to express the real-time pressure value of the medium in the first gas storage chamber 810.

[0134] The fourth measurement module 540 is connected to the second pressure regulating chamber 320 and is used to measure the medium pressure in the second pressure regulating chamber 320. The fourth measurement module 540 can be a pressure sensor, a pressure module encapsulated with a pressure sensor, or other components or devices with pressure measurement capabilities. Because the fourth measurement module 540 is connected to the second pressure regulating chamber 320, the gas medium can move between the pressure-sensing pipeline of the fourth measurement module 540 and the second pressure regulating chamber 320, thereby transmitting the medium pressure of the second pressure regulating chamber 320 to the gas medium in the pressure-sensing pipeline of the fourth measurement module 540. This gas medium is then sensed and measured by the pressure-sensing part of the fourth measurement module 540, generating a fourth pressure measurement value. The fourth pressure measurement value of the fourth measurement module 540 can be an analog signal or a digital signal. If the fourth pressure measurement value of the fourth measurement module 540 is generated in real time, then this fourth pressure measurement value can be used to express the real-time pressure value of the medium pressure in the second pressure regulating chamber 320.

[0135] Based on the aforementioned instrument calibration device, the instrument calibration method can be improved.

[0136] Instrument calibration methods also include,

[0137] The control module 610 acquires a second pressure threshold and a third pressure threshold, wherein the second pressure threshold is greater than the third pressure threshold;

[0138] Control module 610 acquires the second pressure measurement value from the second measurement module;

[0139] The control module 610 acquires the fourth pressure measurement value from the fourth measurement module;

[0140] The control module 610 makes a judgment based on the second pressure measurement value and the fourth pressure measurement value. If the second pressure measurement value is less than the sum of the fourth pressure measurement value and the third pressure threshold, it controls the second pressurization mechanism to provide pressurized gas medium to the first gas storage chamber, so that the medium pressure in the first gas storage chamber increases until the second pressure measurement value is equal to the sum of the fourth pressure measurement value and the second pressure threshold. If the second pressure measurement value is greater than or equal to the sum of the fourth pressure measurement value and the second pressure threshold, it controls the second pressurization mechanism to stop providing gas medium.

[0141] The control module 610 is connected to the second pressurizing mechanism 820, the second measuring module 520, and the fourth measuring module 540, respectively. The control module 610 controls the second pressurizing mechanism 820 based on the second pressure measurement value from the second measuring module 520 and the fourth pressure measurement value from the fourth measuring module 540. The control module 610 is coupled to the second pressurizing mechanism 820, allowing it to start and pressurize the gas medium, or to stop operating. The control module 610 is also coupled to the second measuring module 520, allowing it to obtain the second pressure measurement value from the second measuring module 520. Finally, the control module 610 is coupled to the fourth measuring module 540, allowing it to obtain the fourth pressure measurement value from the fourth measuring module 540. Based on the second and fourth pressure measurements, the control module 610 can control the start and stop of the second pressurizing mechanism 820. For example, the control module 610 obtains a first set pressure range. The lower limit of the first set pressure range is the sum of the fourth pressure measurement and the third pressure threshold, and the upper limit is the sum of the fourth pressure measurement and the second pressure threshold. After determining the first set pressure range, when the second pressure control unit 200 starts and controls the gas medium, the control module 610 reads the pressure measurement value from the second measurement module 520. If the pressure measurement value reaches the lower limit of the first set pressure range, the second pressurizing mechanism 820 is started to pressurize. During the pressurization process of the second pressurizing mechanism 820, the pressure measurement value of the second measurement module 520 continues to rise. When the pressure measurement value of the second measurement module 520 reaches the upper limit of the first set pressure range, the pressurization operation of the second pressurizing mechanism 820 is stopped until the pressure measurement value of the second measurement module 520 reaches the lower limit of the first set pressure range again.

[0142] Reference Figure 4 and Figure 5 As shown, in some cases of this example, the instrument calibration device and pressure testing method can be further improved.

[0143] The instrument calibration device also includes a second gas storage chamber 910, a vacuum pump 920, a third measurement module 530, and a fourth measurement module 540.

[0144] The second gas storage chamber 910 is used to store a gaseous medium under negative pressure. The second gas storage chamber 910 is connected to the second input terminal 202 of the second pressure control unit 200. The second gas storage chamber 910 can be a chamber formed by a gas tank or other gas storage device. To achieve the gas storage function, the second gas storage chamber 910 is sealed except at necessary communication points to prevent leakage of the gaseous medium. Since the gaseous medium stored in the second gas storage chamber 910 is under negative pressure, the structure forming the second gas storage chamber 910 also has the ability to withstand negative pressure. The second gas storage chamber 910 is connected to the second input terminal 202 of the second pressure control unit 200, thereby allowing the second gas storage chamber 910 to supply a gaseous medium under negative pressure to the second pressure control unit 200. The second pressure control unit 200 is used to control the gas medium, so that the pressure of the gas medium at the output end 203 of the second pressure control unit 200 reaches the desired pressure value. Unlike the positive pressure gas medium, the medium pressure in the second gas storage chamber 910 is less than or equal to the medium pressure at the second input end 202 of the second pressure control unit 200. Therefore, the gas medium actually mainly moves from the second input end 202 of the second pressure control unit 200 to the second gas storage chamber 910.

[0145] A vacuum pump 920 is provided, with its inlet connected to a second gas storage chamber 910. The vacuum pump 920 extracts gaseous medium from the second gas storage chamber 910 to reduce the medium pressure in the second gas storage chamber 910 to a negative pressure. In some cases, the vacuum pump 920 has an inlet and an outlet. The working principle of the vacuum pump 920 is to extract gaseous medium from its inlet and discharge it to its outlet. If there is no replenishment of gaseous medium at the inlet of the vacuum pump 920, or if the replenishment amount is less than the extraction amount, the medium pressure at the inlet of the vacuum pump 920 will decrease to a negative pressure after extraction. In this example, the vacuum pump 920 is connected to the second gas storage chamber 910, so it can extract the gaseous medium from the second gas storage chamber 910, thereby reducing the pressure in the second gas storage chamber 910 to a negative pressure.

[0146] The third measurement module 530 is connected to the second gas storage chamber 910 and is used to measure the medium pressure in the second gas storage chamber 910. The third measurement module 530 can be a pressure sensor, a pressure module encapsulated with a pressure sensor, or other components or devices with pressure measurement capabilities. Because the third measurement module 530 is connected to the second gas storage chamber 910, the gas medium can move between the pressure-sensing pipeline of the third measurement module 530 and the second gas storage chamber 910, thereby transmitting the medium pressure of the second gas storage chamber 910 to the gas medium in the pressure-sensing pipeline of the third measurement module 530. This pressure is then sensed and measured by the pressure-sensing part of the third measurement module 530, generating a third pressure measurement value. The third pressure measurement value of the third measurement module 530 can be an analog signal or a digital signal. If the third pressure measurement value of the third measurement module 530 is generated in real time, it can be used to express the real-time pressure value of the medium pressure in the second gas storage chamber 910.

[0147] The fourth measurement module 540 is connected to the second pressure regulating chamber 320 and is used to measure the medium pressure in the second pressure regulating chamber 320. The fourth measurement module 540 can be a pressure sensor, a pressure module encapsulated with a pressure sensor, or other components or devices with pressure measurement capabilities. Because the fourth measurement module 540 is connected to the second pressure regulating chamber 320, the gas medium can move between the pressure-sensing pipeline of the fourth measurement module 540 and the second pressure regulating chamber 320, thereby transmitting the medium pressure of the second pressure regulating chamber 320 to the gas medium in the pressure-sensing pipeline of the fourth measurement module 540. This gas medium is then sensed and measured by the pressure-sensing part of the fourth measurement module 540, generating a fourth pressure measurement value. The fourth pressure measurement value of the fourth measurement module 540 can be an analog signal or a digital signal. If the fourth pressure measurement value of the fourth measurement module 540 is generated in real time, then this fourth pressure measurement value can be used to express the real-time pressure value of the medium pressure in the second pressure regulating chamber 320.

[0148] Based on the aforementioned instrument calibration device, the instrument calibration method can be improved.

[0149] Instrument calibration methods also include,

[0150] The control module 610 acquires a second pressure threshold and a third pressure threshold, wherein the second pressure threshold is greater than the third pressure threshold; the second pressure threshold and the third pressure threshold here may be the same as the second pressure threshold and the third pressure threshold in other cases, or they may be all or partly different.

[0151] The control module 610 acquires the third pressure measurement value from the third measurement module 530;

[0152] The control module 610 acquires the fourth pressure measurement value from the fourth measurement module 540;

[0153] The control module 610 makes a judgment based on the third pressure measurement value and the fourth pressure measurement value. If the third pressure measurement value is greater than the sum of the fourth pressure measurement value and the second pressure threshold, the control module 610 controls the vacuum pump 920 to extract the gas medium from the second gas storage chamber 910, so that the medium pressure in the second gas storage chamber 910 decreases until the third pressure measurement value is equal to the sum of the fourth pressure measurement value and the third pressure threshold. If the third pressure measurement value is less than or equal to the sum of the fourth pressure measurement value and the third pressure threshold, the control module 610 controls the vacuum pump 920 to stop extracting the gas medium from the second gas storage chamber 910.

[0154] The control module 610 is connected to the vacuum pump 920, the third measurement module 530, and the fourth measurement module 540. The control module 610 controls the vacuum pump 920 based on the pressure measurement value from the third measurement module 530. The control module 610 is coupled to the vacuum pump 920, allowing it to start the pump and begin extracting the gas medium from the second gas storage chamber 910, or to stop the pump. The control module 610 is also coupled to the third measurement module 530, allowing it to obtain pressure measurement values ​​from it. Finally, the control module 610 is coupled to the fourth measurement module 540, allowing it to obtain a fourth pressure measurement value from it. Based on the third and fourth pressure measurements, the control module 610 can control the start and stop of the vacuum pump 920. For example, the control module 610 obtains a second set pressure range. The lower limit of the first set pressure range is the sum of the fourth pressure measurement and the third pressure threshold, and the upper limit is the sum of the fourth pressure measurement and the second pressure threshold. After determining the second set pressure range, when the second pressure control unit 200 starts and controls the gas medium, the control module 610 reads the third pressure measurement from the third measurement module 530. If the third pressure measurement reaches the upper limit of the second set pressure range, the vacuum pump 920 is started to extract the gas medium from the second gas storage chamber 910. During the extraction of the gas medium by the vacuum pump 920, the third pressure measurement of the third measurement module 530 continues to decrease. When the pressure measurement of the third measurement module 530 reaches the lower limit of the second set pressure range, the extraction of the gas medium by the vacuum pump 920 is stopped until the third pressure measurement of the third measurement module 530 reaches the upper limit of the second set pressure range again.

[0155] Reference Figure 4 and Figure 5 As shown, in some cases of this example, the instrument calibration device and pressure testing method can be further improved.

[0156] The second pressure control unit 200 includes a second pressure control valve 210 and a third pressure control valve 220, which are used to control the gas medium.

[0157] The second pressure control unit 200 includes a second pressure control valve 210 and a third pressure control valve 220. One end of the second pressure control valve 210 is connected to a device that provides a positive pressure gas medium, and the other end of the second pressure control valve 210 is connected to the output end 203 of the second pressure control unit 200. One end of the third pressure control valve 220 is connected to a device that provides an atmospheric pressure or negative pressure gas medium, and the other end of the third pressure control valve 220 is connected to the output end 203 of the second pressure control unit 200.

[0158] The second pressure control valve 210 can be a solenoid valve or other types of valves that can control pressure and adjust the flow of the channel. Depending on the type of the second pressure control valve 210, it can control the opening and closing of the channel it is in, as well as the flow range of the channel. Generally, the second pressure control valve 210 can be a two-way valve. When the second pressure control valve 210 is used for other purposes, it can also be a three-way valve or a valve with more channels. Taking a two-way valve as an example, the two ends of the second pressure control valve 210 are respectively provided with two valve ports. These two valve ports are connected through a valve passage located inside the second pressure control valve 210. The object connected to one of the valve ports can provide a gas medium with positive pressure in the working state. The other valve port of the second pressure control valve 210 is connected to the output end 203 of the second pressure control unit 200. The second pressure control valve 210 can control the opening and closing of the valve passage through the valve core or other parts.

[0159] Furthermore, the connection structure of the second pressure control valve 210 can be combined with other cases in this example. For example, one of the valve ports of the second pressure control valve 210 is connected to the first input terminal 201 of the second pressure control unit 200, which is in turn connected to the first gas storage chamber 810 or other external positive pressure gas source (here, an external positive pressure gas source refers to a device that is independent of the instrument calibration device and can provide a positive pressure gas medium). When the second pressure control valve 210 is in the closed state, the first input terminal 201 of the second pressure control unit 200 is disconnected from the output terminal of the second pressure control valve 210. When the second pressure control valve 210 is in the open state, the first input terminal 201 of the second pressure control unit 200 is connected to the output terminal 203 of the second pressure control unit 200. The positive pressure gas medium can be transmitted from the first input terminal 201 of the second pressure control unit 200 to the output terminal of the second pressure control valve 210 through the second pressure control valve 210, causing the medium pressure at the output terminal of the second pressure control valve 210 to rise.

[0160] The third pressure control valve 220 can be a solenoid valve or other types of valves that can achieve pressure control and adjust the connectivity of the channel. Depending on the type of the third pressure control valve 220, it can control the opening and closing of the channel it is located in, as well as the connectivity range of the channel it is located in. Generally, the third pressure control valve 220 can be a two-way valve. When the third pressure control valve 220 is used for other purposes, it can also be a three-way valve or a valve with more channels. Taking a three-way valve as an example, the third pressure control valve 220 has two valve ports at each end. These two valve ports are connected through a valve passage located inside the third pressure control valve 220. The object connected to one of the valve ports can provide a gas medium with negative pressure in the working state. The other valve port of the third pressure control valve 220 is connected to the output end 203 of the second pressure control unit 200. The third pressure control valve 220 can control the opening and closing of the valve passage through the valve core or other parts.

[0161] Furthermore, the connection structure of the third pressure control valve 220 can be combined with other cases in this example. For example, one of the valve ports of the third pressure control valve 220 is connected to the second input terminal 202 of the second pressure control unit 200, which is in turn connected to the second gas storage chamber 910 or other external positive pressure gas source (here, an external positive pressure gas source refers to a device that is independent of the instrument calibration device and can provide a positive pressure gas medium). When the third pressure control valve 220 is in the closed state, the second input terminal 202 of the second pressure control unit 200 is disconnected from the output terminal 203 of the second pressure control unit 200. When the third pressure control valve 220 is in the open state, the second input terminal 202 of the second pressure control unit 200 is connected to the output terminal 203 of the second pressure control unit 200. The negative pressure of the gas medium can be transmitted from the second input terminal 202 of the second pressure control unit 200 to the gas medium at the output terminal of the second pressure control valve 210 through the third pressure control valve 220, causing the medium pressure at the output terminal of the second pressure control valve 210 to decrease.

[0162] The aforementioned control module 610 is connected to the first pressure control unit 100, the second pressure control unit 200, and the first measurement module 510, respectively. The control module 610 is connected to the second pressure control valve 210 and the third pressure control valve 220, respectively. The control module 610 is used to control the opening and closing of the second pressure control valve 210 and the third pressure control valve 220 according to the first pressure measurement value of the first measurement module 510.

[0163] Based on the aforementioned instrument calibration device, the instrument calibration method can be improved.

[0164] The aforementioned control module 610 controls the first pressure control unit 100 and the second pressure control unit 200 based on the first target pressure value and the first pressure measurement value of the first measurement module 510, including:

[0165] If the first pressure measurement value is greater than the first target pressure value, close the second pressure control valve 210 or reduce the opening range of the second pressure control valve 210, open the third pressure control valve 220 or increase the opening range of the third pressure control valve 220, so that the first pressure measurement value is reduced to the first target pressure value;

[0166] If the first pressure measurement value is less than the first target pressure value, open the second pressure control valve 210 or increase the opening range of the second pressure control valve 210, close the third pressure control valve 220 or decrease the opening range of the third pressure control valve 220, so that the first pressure measurement value rises to the first target pressure value.

[0167] The control module 610 is coupled to the second pressure control valve 210. Based on this coupling, the control module 610 can control the second pressure control valve 210. The control module 610 is also coupled to the third pressure control valve 220. Based on this coupling, the control module 610 can control the third pressure control valve 220. Furthermore, since the control module 610 is also coupled to the first measurement module 510, the control module 610 can control the second pressure control valve 210 and the third pressure control valve 220 according to the first pressure measurement value of the first measurement module 510. For example, when the first pressure measurement value of the first measurement module 510 is less than the target pressure value, the control module 610 controls the second pressure control valve 210 to open or increase its opening range, and controls the third pressure control valve 220 to close or decrease its opening range, so that the gas medium enters the output terminal 203 of the second pressure control unit 200, thereby increasing the pressure of the second pressure control unit 200. When the first pressure measurement value of the first measuring module 510 is greater than the target pressure value, the control module 610 controls the second pressure control valve 210 to close or reduce the opening range of the second pressure control valve 210, and controls the third pressure control valve 220 to open or increase the opening range of the third pressure control valve 220, so that the gas medium leaves the output end 203 of the second pressure control unit 200, thereby reducing the medium pressure at the output end 203 of the second pressure control unit 200. When the first pressure measurement value of the first measuring module 510 is equal to the target pressure value, the control module 610 can control both the second pressure control valve 210 and the third pressure control valve 220 to be at a suitable opening range, or control both the second pressure control valve 210 and the third pressure control valve 220 to be in a closed state, so that the amount of gas medium at the output end 203 of the second pressure control unit 200 remains unchanged, thereby keeping the medium pressure at the output end 203 of the second pressure control unit 200 constant.

[0168] Reference Figure 4 and Figure 5 As shown, in some cases of this example, the instrument calibration device and pressure testing method can be further improved.

[0169] The instrument calibration device also includes a fourth measurement module 540. The fourth measurement module 540 is connected to the second pressure regulating chamber 320 and is used to measure the medium pressure in the second pressure regulating chamber 320. The fourth measurement module 540 can be a pressure sensor, a pressure module encapsulated with a pressure sensor, or other components or devices with pressure measurement capabilities. Because the fourth measurement module 540 is connected to the second pressure regulating chamber 320, the gas medium can move between the pressure-sensing pipeline of the fourth measurement module 540 and the second pressure regulating chamber 320, thereby transmitting the medium pressure of the second pressure regulating chamber 320 to the gas medium in the pressure-sensing pipeline of the fourth measurement module 540. This gas medium is then sensed and measured by the pressure-sensing part of the fourth measurement module 540, generating a pressure measurement value. The pressure measurement value of the fourth measurement module 540 can be an analog signal or a digital signal. If the pressure measurement value of the fourth measurement module 540 is generated in real time, then this pressure measurement value can be used to express the real-time pressure value of the medium pressure in the second pressure regulating chamber 320.

[0170] Based on the aforementioned instrument calibration device, the instrument calibration method can be improved.

[0171] The control module 610 obtains the range of the fourth measurement module 540, determines the third range based on the range of the fourth measurement module 540, the third range is greater than the second range and less than the first range, and determines the fourth range based on the range of the fourth measurement module 540 and the voltage regulation ratio, the fourth range is greater than the first range.

[0172] The control module 610 determines the second target pressure value based on the detection pressure point, the first range, the second range, the third range, and the fourth range. If the detection pressure point exceeds the second range but is within the third range, the second target pressure value is equal to the detection pressure point, and the second pressure output port is used to connect to the pressure gauge under test. If the detection pressure point exceeds the first range but is within the fourth range, the second target pressure value is equal to the product of the detection pressure point and the pressure adjustment ratio, and the first pressure output port is used to connect to the pressure instrument under test.

[0173] The control module 610 controls the first pressure control unit 100 and the second pressure control unit 200 according to the second target pressure value and the fourth pressure measurement value of the fourth measurement module, so that the fourth pressure measurement value reaches the second target pressure value.

[0174] For example, if the ratio of the first force-bearing area to the second force-bearing area is 1:10, and the target pressure value of the medium pressure at the first pressure output port 410 is determined, then the desired pressure value of the second pressure regulating chamber 320 is 1 / 10 of the target pressure value. Therefore, the first pressure control unit 100 and the second pressure control unit 200 can be controlled according to the pressure measurement value of the fourth measurement module 540. The specific control process can be referred to in other cases of this example, which will not be repeated here. The pressure measurement value of the fourth measurement module 540 reaches the desired pressure value. Compared with directly measuring the medium pressure at the first pressure output port 410 using the measurement module, the range of the medium pressure at the first pressure output port 410 is expanded.

[0175] In order to calculate the pressure regulation ratio more accurately, the aforementioned control module obtains the pressure regulation ratio of the pressure regulating piston, including controlling the first pressure control unit and the second pressure control unit so that the first pressure measurement value and the fourth pressure measurement value are in one of either pressure increase or pressure decrease.

[0176] At the first moment, obtain the first pressure measurement value P at that moment. 11 Obtain the fourth pressure measurement value P at that moment. 14 ;

[0177] At the second moment, obtain the first pressure measurement value P at that moment. 21 Obtain the fourth pressure measurement value P at that moment. 22 ;

[0178] Calculate the pressure regulating ratio k of the pressure regulating piston, so that...

[0179] Reference Figure 4 and Figure 5 As shown, in some cases of this example, the instrument calibration device and pressure testing method can be further improved.

[0180] The instrument calibration device also includes a data acquisition module 620 and a detection and processing module 630.

[0181] The acquisition module 620 is provided with at least one channel unit 621, which is used to connect with a pressure instrument to acquire the signal to be measured from the pressure instrument. The acquisition module 620 is also provided with at least one signal analysis unit 622, which is connected to the channel unit 621. The signal analysis unit 622 is used to analyze the acquired signal to be measured and generate the measured value.

[0182] The instrument calibration device has at least one channel unit 621. Depending on the communication type of the channel unit 621, if the channel unit 621 is used to transmit bus signals, one channel unit 621 can simultaneously couple and connect multiple instruments under test. If the channel unit 621 is used to transmit analog signals, one channel unit 621 can only couple and connect one instrument under test at a time. After the channel unit 621 and the instrument under test are connected, the channel unit 621 can acquire the signal to be measured from the instrument under test. During the pressure detection process, the instrument under test measures the medium pressure provided by the instrument calibration device (provided from the first pressure output port 410 or from the second pressure output port 420). Therefore, the signal to be measured characterizes the measurement result of the instrument under test.

[0183] After the channel unit 621 acquires the signal to be measured, it transmits the signal to the signal analysis unit 622. Depending on the signal type, if the signal type is a digital signal, multiple channel units 621 can simultaneously send the signal to be measured to the signal analysis unit 622. The signal analysis unit 622 can receive and analyze the signal to be measured serially or in parallel. The signal analysis unit 622 is equipped with a communication protocol corresponding to the signal to be measured, and can analyze the signal to obtain the information contained in the signal, i.e., generate the measured value. This situation is mostly applicable to digital pressure instruments such as smart pressure gauges. If the signal type is an analog signal, and multiple channel units 621 share a single signal analysis unit 622... The signal analysis unit 622 needs to switch between channel units 621. For example, it can connect to one channel unit 621 and disconnect from other channel units 621. It receives and analyzes an analog signal from the channel unit 621. After analysis, it switches to the next channel unit 621 according to preset conditions. The signal analysis unit 622 can be configured with circuits such as current measurement circuit, voltage measurement circuit, and switch quantity measurement circuit that can measure analog signals. When the signal to be measured is obtained, the signal to be measured is measured to obtain the signal measurement value, which completes the analysis of the signal to be measured. The signal measurement value is the measured value. This situation is mostly applicable to process pressure instruments such as pressure transmitters and pressure switches.

[0184] The detection processing module 630 is connected to the signal analysis unit 622 and the first measurement module 510 respectively. It is used to obtain the measured indication value from the signal analysis unit 622, obtain the pressure measurement value from the first measurement module 510, process the measured indication value and the pressure measurement value, and generate the detection result.

[0185] In some cases, the detection processing module 630 can be integrated with the aforementioned control module 610 in whole or in part, or the detection processing module 630 and the control module 610 can be implemented by at least partially identical hardware carriers. During the pressure detection process, the detection point is determined according to the instrument under test, and the detection point is input as the target pressure value to the control module 610 of the instrument calibration device. The control module 610 controls the first pressure control unit 100 and the second pressure control unit 200 according to the target pressure value and the pressure measurement value of the first measurement module 510 (or, in other cases in this example, the pressure measurement value of the fourth measurement module 540). When the pressure measurement value of the measuring module 510 reaches the target pressure value (or, in other cases in this example, the expected pressure value that is proportional to the target pressure value), the pressure measurement value is obtained from the first measuring module 510. Since the accuracy level of the first measuring module 510 is higher than that of the instrument under test, the pressure measurement value of the first measuring module 510 can represent the reference value of the medium pressure. Simultaneously, the measured indication value is obtained from the signal analysis unit 622. The measured indication value and the pressure measurement value form a comparison. According to the testing requirements, such as verification, calibration, adjustment, etc., the measured indication value and the pressure measurement value can be further processed to obtain the test result.

[0186] Instrument calibration methods also include:

[0187] The detection and processing module obtains the target pressure value and the corresponding detection pressure point from the control module.

[0188] When the first pressure measurement value reaches the target pressure value, the detection processing module obtains the measured value from the signal analysis unit and generates the detection result based on the detection pressure point and the measured value.

[0189] An instrument calibration device includes a computer-readable storage medium storing instructions that, when executed on the instrument calibration device, cause the instrument calibration device to perform any of the aforementioned instrument calibration methods and preferred embodiments.

[0190] Some of the situations described in this application refer to situations where the corresponding technical solutions may occur and be combined with other technical solutions of this application, or they may not occur; provided that the technical solutions are not mutually exclusive, the technical solutions corresponding to two or more situations may be combined in any way.

[0191] The coupling described in this application refers to the situation where two or more coupled circuits form a coupled network, and if the current or voltage in one of the circuits changes, it can affect the other coupled circuits, thereby causing the other coupled circuits to change accordingly. The coupling relationship can be achieved by wired connection, wireless connection, or a combination of both.

[0192] It is understood that, for the implementation of the scheme, the instrument calibration device may also include pipelines for connection, bases or housings for fixing related components, power supplies for supplying power to various electrical components, etc. Such technical features can be configured or combined according to the disclosure of the prior art and in combination with the general knowledge of those skilled in the art, and this application does not limit this.

[0193] The above detailed embodiments further illustrate the purpose, technical solution, and beneficial effects of the embodiments of this application. It should be understood that the above are merely specific embodiments of the embodiments of this application and are not intended to limit the protection scope of the embodiments of this application. Any modifications, equivalent substitutions, improvements, etc., made on the basis of the technical solutions of the embodiments of this application should be included within the protection scope of the embodiments of this application.

Claims

1. An instrument calibration method, applied to an instrument calibration device, characterized in that, The instrument calibration device includes a first pressure control unit, a second pressure control unit, a pressure regulating cylinder, a first pressure output port, a second pressure output port, a first measurement module, and a control module. The first pressure control unit is used to control the liquid medium to adjust the medium pressure at the output end of the first pressure control unit. The second pressure control unit is used to control the gas medium to adjust the medium pressure at the output end of the second pressure control unit. The pressure regulating cylinder is provided with a pressure regulating piston, which divides the pressure regulating cylinder into a first pressure regulating chamber and a second pressure regulating chamber that are sealed to each other. The first pressure regulating chamber is connected to the output end of the first pressure control unit, and the second pressure regulating chamber is connected to the output end of the second pressure control unit. The pressure regulating piston has a first force-bearing area in the first pressure regulating chamber and a second force-bearing area in the second pressure regulating chamber. The first force-bearing area is smaller than the second force-bearing area, and their ratio is fixed. The first pressure output port is connected to the first pressure regulating chamber, and the second pressure output port is connected to the second pressure regulating chamber. The first measurement module is connected to the first pressure output port and is used to measure the medium pressure at the first pressure output port. The instrument calibration method includes: The control module acquires the detection pressure point, which is used to detect the pressure gauge under test; The control module obtains the pressure adjustment ratio of the pressure regulating piston, and the pressure adjustment ratio is equal to the ratio of the medium pressure in the first pressure regulating chamber to the medium pressure in the second pressure regulating chamber. The control module acquires the range of the first measuring module, determines the first range based on the range of the first measuring module, and determines the second range based on the range of the first measuring module and the voltage regulation ratio. The first range is greater than the second range, and the accuracy class of the first range and the second range is the same. The control module determines a first target pressure value based on the detected pressure point, the first range, and the second range. If the detected pressure point is within the second range, the first target pressure value is equal to the product of the detected pressure point and the pressure adjustment ratio. The second pressure output port is used to connect to the pressure instrument under test. If the detected pressure point value exceeds the second range but is within the first range, the first target pressure value is equal to the detected pressure point. The first pressure output port is used to connect to the pressure instrument under test. The control module controls the first pressure control unit and the second pressure control unit according to the first target pressure value and the first pressure measurement value of the first measurement module, so that the first pressure measurement value reaches the first target pressure value; The pressure gauge under test measures the pressure of the medium provided by the instrument calibration device, generates a test value, processes the test value and the test pressure point, and obtains the test result.

2. The instrument calibration method according to claim 1, characterized in that, The first pressure regulating chamber is connected to the output end of the first pressure control unit, including that the first pressure regulating chamber is connected to one end of the shut-off valve, and the other end of the shut-off valve is connected to the output end of the first pressure control unit. When the shut-off valve is in the open state, the first pressure regulating chamber and the output end of the first pressure control unit are in a connected state. When the shut-off valve is in the closed state, the first pressure regulating chamber and the output end of the first pressure control unit are in a disconnected state. The control module controls the first pressure control unit and the second pressure control unit based on the first target pressure value and the first pressure measurement value of the first measurement module, including: A first pressure threshold is obtained based on the first target pressure value, and the first pressure threshold is less than the first target pressure value; The shut-off valve is controlled to be in the open state, and the first pressure control unit and the second pressure control unit are controlled to increase the first pressure measurement value until the first pressure measurement value reaches the first pressure threshold. The shut-off valve is controlled to change from an open state to a closed state, thereby controlling the second pressure control unit to increase the first pressure measurement value until the first pressure measurement value reaches the first target pressure value.

3. The instrument calibration method according to claim 2, characterized in that, The instrument calibration device further includes a liquid storage chamber and a first pressurization mechanism. The liquid storage chamber is used to store a liquid medium, and the first pressurization mechanism is used to pressurize the liquid medium. The input end of the first pressurization mechanism is connected to the liquid storage chamber, and the output end of the first pressurization mechanism is connected to the input end of the first pressure control unit. The control of the shut-off valve to be in the open state, and the control of the first pressure control unit and the second pressure control unit to increase the first pressure measurement value, includes activating the first pressure boosting mechanism to provide a pressurized liquid medium to the input end of the first pressure control unit; The control mechanism changes the shut-off valve from the open state to the closed state, thereby controlling the second pressure control unit. This includes controlling the first pressurization mechanism to stop supplying the liquid medium.

4. The instrument calibration method according to claim 3, characterized in that, The first pressure control unit includes a first pressure control valve. One end of the first pressure control valve is connected to the output end of the first pressure control unit, and the other end of the first pressure control valve is connected to the liquid storage chamber. When the first pressure control valve is in the open state, the output end of the first pressure control unit is connected to the liquid storage chamber. When the first pressure control valve is in the closed state, the output end of the first pressure control unit is disconnected from the liquid storage chamber. The control of the shut-off valve to be in the open state, and the control of the first pressure control unit and the second pressure control unit to increase the first pressure measurement value, includes controlling the first pressure control valve to be in the closed state; The control of the shut-off valve from the open state to the closed state, and the control of the second pressure control unit, includes controlling the first pressure control valve to be in the open state, so that the liquid medium in the first pressure control unit flows into the liquid storage chamber.

5. The instrument calibration method according to claim 1, characterized in that, The instrument calibration device further includes a first gas storage chamber, a second pressurizing mechanism, a second measuring module, and a fourth measuring module. The first gas storage chamber is used to store a gas medium with positive pressure. The first gas storage chamber is connected to the first input terminal of the second pressure control unit. The second pressurizing mechanism is used to pressurize the gas medium to output a gas medium with positive pressure. The output terminal of the second pressurizing mechanism is connected to the first gas storage chamber. The second measuring module is used to measure the medium pressure in the first gas storage chamber. The second measuring module is connected to the first gas storage chamber. The fourth measuring module is used to measure the medium pressure in the second pressure regulating chamber. The fourth measuring module is connected to the second pressure regulating chamber. The instrument calibration method also includes, The control module acquires a second pressure threshold and a third pressure threshold, wherein the second pressure threshold is greater than the third pressure threshold. The control module acquires the second pressure measurement value from the second measurement module; The control module acquires the fourth pressure measurement value from the fourth measurement module; The control module makes a judgment based on the second pressure measurement value and the fourth pressure measurement value. If the second pressure measurement value is less than the sum of the fourth pressure measurement value and the third pressure threshold, the control module controls the second pressurization mechanism to provide pressurized gas medium to the first gas storage chamber, so that the medium pressure in the first gas storage chamber increases until the second pressure measurement value is equal to the sum of the fourth pressure measurement value and the second pressure threshold. If the second pressure measurement value is greater than or equal to the sum of the fourth pressure measurement value and the second pressure threshold, the control module controls the second pressurization mechanism to stop providing gas medium.

6. The instrument calibration method according to claim 1, characterized in that, The instrument calibration device further includes a second gas storage chamber, a vacuum pump, a third measuring module, and a fourth measuring module. The second gas storage chamber is used to store a gas medium with negative pressure. The second gas storage chamber is connected to the second input terminal of the second pressure control unit, which is used to control the gas medium. The inlet terminal of the vacuum pump is connected to the second gas storage chamber, and the vacuum pump is used to extract the gas medium from the second gas storage chamber to make the medium pressure in the second gas storage chamber negative. The third measuring module is used to measure the medium pressure in the second gas storage chamber and is connected to the second gas storage chamber. The fourth measuring module is used to measure the medium pressure in the second pressure regulating chamber and is connected to the second pressure regulating chamber. The instrument calibration method also includes, The control module acquires a second pressure threshold and a third pressure threshold, wherein the second pressure threshold is greater than the third pressure threshold. The control module acquires the third pressure measurement value from the third measurement module; The control module acquires the fourth pressure measurement value from the fourth measurement module; The control module makes a judgment based on the third pressure measurement value and the fourth pressure measurement value. If the third pressure measurement value is greater than the sum of the fourth pressure measurement value and the second pressure threshold, the control module controls the vacuum pump to extract the gas medium from the second gas storage chamber, so that the medium pressure in the second gas storage chamber decreases until the third pressure measurement value is equal to the sum of the fourth pressure measurement value and the third pressure threshold. If the third pressure measurement value is less than or equal to the sum of the fourth pressure measurement value and the third pressure threshold, the control module controls the vacuum pump to stop extracting the gas medium from the second gas storage chamber.

7. The instrument calibration method according to claim 1, characterized in that, The second pressure control unit includes a second pressure control valve and a third pressure control valve. One end of the second pressure control valve is used to connect to a device that provides a gas medium with positive pressure, and the other end of the second pressure control valve is connected to the output end of the second pressure control unit. One end of the third pressure control valve is used to connect to a device that provides atmospheric pressure or negative pressure, and the other end of the third pressure control valve is connected to the output end of the second pressure control unit. The control module is connected to the first pressure control unit, the second pressure control unit, and the first measurement module, respectively. It includes a control module connected to the second pressure control valve and the third pressure control valve, and the control module is used to control the opening and closing of the second pressure control valve and the third pressure control valve according to the first pressure measurement value of the first measurement module. The control module controls the first pressure control unit and the second pressure control unit based on the first target pressure value and the first pressure measurement value of the first measurement module, including: If the first pressure measurement value is greater than the first target pressure value, close the second pressure control valve or reduce the opening range of the second pressure control valve, and open the third pressure control valve or increase the opening range of the third pressure control valve, so that the first pressure measurement value is reduced to the first target pressure value; If the first pressure measurement value is less than the first target pressure value, open the second pressure control valve or increase the opening range of the second pressure control valve, close the third pressure control valve or decrease the opening range of the third pressure control valve, so that the first pressure measurement value rises to the first target pressure value.

8. The instrument calibration method according to claim 1, characterized in that, The instrument calibration device further includes a fourth measurement module, which is connected to the second pressure regulating chamber and is used to measure the medium pressure in the second pressure regulating chamber. The control module obtains the range of the fourth measurement module, determines the third range based on the range of the fourth measurement module, the third range is greater than the second range and less than the first range, and determines the fourth range based on the range of the fourth measurement module and the voltage regulation ratio, the fourth range is greater than the first range. The control module determines a second target pressure value based on the detected pressure point, the first range, the second range, the third range, and the fourth range. If the detected pressure point exceeds the second range but is within the range of the third range, the second target pressure value is equal to the detected pressure point, and the second pressure output port is used to connect to the pressure gauge under test. If the detected pressure point exceeds the first range but is within the range of the fourth range, the second target pressure value is equal to the product of the detected pressure point and the pressure adjustment ratio, and the first pressure output port is used to connect to the pressure instrument under test. The control module controls the first pressure control unit and the second pressure control unit according to the second target pressure value and the fourth pressure measurement value of the fourth measurement module, so that the fourth pressure measurement value reaches the second target pressure value.

9. The instrument calibration method according to claim 8, characterized in that, The control module obtains the pressure adjustment ratio of the pressure regulating piston. include, The control module controls the first pressure control unit and the second pressure control unit to make the first pressure measurement value and the fourth pressure measurement value either undergo a pressure increase or a pressure decrease. At the first moment, acquire the first pressure measurement value P at the first moment. 11 Obtain the fourth pressure measurement value P at that moment. 14 ; At the second time point, acquire the first pressure measurement value P at the second time point. 21 Obtain the fourth pressure measurement value P at that moment. 24 ; Calculate the pressure regulation ratio k of the pressure regulating piston, so that...

10. An instrument calibration device, characterized in that, The device includes a computer-readable storage medium storing instructions that, when executed on the instrument calibration apparatus, cause the instrument calibration apparatus to perform the instrument calibration method according to any one of claims 1 to 9.

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