Pressure instrument performance testing device

Abstract

The utility model discloses a pressure instrument performance testing device, which comprises a pressure pipeline, a standard pressure source, constant temperature equipment, a pressure generator, a high-temperature box, a high-temperature cavity, a pressure sensor, a pressure transmitter and a data acquisition module, the high-temperature cavity is arranged in the high-temperature box, the temperature in the high-temperature cavity is adjustable, a closed isolation cavity is arranged between the high-temperature box and the high-temperature cavity, and the temperature in the isolation cavity is adjustable; the first end of the pressure pipeline passes through the constant temperature equipment and is connected with the standard pressure source, and the second end of the pressure pipeline is connected with the high-temperature cavity; the pressure generator is connected with the pressure pipeline; the pressure sensor is arranged on the high-temperature cavity, and the pressure sensing surface of the pressure sensor is in contact with a medium in the high-temperature cavity; the pressure transmitter is arranged in the isolation cavity and is connected with the pressure sensor; and the data acquisition module is used for acquiring data of the standard pressure source, the pressure generator and the pressure transmitter. According to the utility model, the technical effect of testing the metering performance of the pressure instrument under the high-temperature working condition is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to sensor detection technical field, specifically, relate to a pressure instrument performance testing device. BACKGROUND

[0002] Pressure detection is actually pressure detection in physical concept, that is, the force perpendicularly acting on unit area. Pressure is one of important parameters in industrial production, and the accuracy of pressure detection in some key scenes is a necessary condition to ensure safety. A large number of pressure instruments are applied in the fields of aerospace, petroleum and petrifaction, automobile and the like, and the actual working conditions of most of them are relatively poor, especially high-temperature environment. Taking the field of aerospace as an example, the outlet temperature of combustion chamber reaches 500 DEG C, and the temperature of lubricating oil system reaches 200 DEG C; the temperature of oil exploitation industry reaches 200 DEG C; the temperature of thermal power and nuclear power fields reaches 600 DEG C; the saturated steam temperature of chemical industry reaches 250 DEG C; and the high-temperature sterilization temperature of medical treatment and food reaches 150 DEG C.

[0003] Generally, under high-temperature working conditions, the force sensor and the pressure transmitter are divided into two parts and connected through wires, which are collectively referred to as pressure instruments below. The pressure sensor serves as a pressure sensitive element, and the pressure sensing surface directly contacts with high-temperature medium to convert the pressure physical quantity into an electric signal. The pressure transmitter processes the electric signal converted by the pressure sensor and converts it into a standard analog signal commonly used in industry, such as (4-20) mA, 0-5 V, or a digital signal, for on-site display or remote transmission. Taking the measurement of the pressure in a high-temperature pressure vessel as an example, the usual measurement method is to connect the pressure sensor with the pressure vessel through threads or a pressure lead pipe, and the pressure sensing surface of the pressure sensor directly contacts with the high-temperature medium in the pressure vessel, with a temperature of 500 DEG C. The pressure sensor body and the transmitter are in a use environment with a relatively low temperature.

[0004] The sensitive element is installed in the pressure sensor to convert the pressure value into an original electric signal and transmit it to the pressure transmitter. The pressure transmitter processes the electric signal by methods such as filtering and then converts it into a standard signal commonly used in industry, such as (4-20) mA, 0-5 V, etc. The final measurement result is output as a standard signal by the pressure transmitter.

[0005] Since the set value plays an important role in the output of the pressure instrument, in order to ensure the measurement accuracy of the pressure sensor and the transmitter, metrological calibration is an important means. The common problem of the pressure instrument detection method used under high-temperature working conditions is "normal-temperature detection and high-temperature use". Since there is a lack of performance evaluation method of pressure instruments under working conditions, the performance of the pressure instrument cannot be evaluated when it exceeds the range of existing technical regulations. UTILITY MODEL CONTENT

[0006] The utility model discloses a pressure instrument performance testing device, to solve the problem of lacking pressure instrument performance testing under high temperature working condition in related art.

[0007] In order to realize above-mentioned purpose, the utility model provides a pressure instrument performance testing device, include: pressure pipeline, standard pressure source, constant temperature equipment, pressure generator, high temperature box, high temperature chamber, pressure sensor, pressure transmitter and data acquisition module,

[0008] The high temperature chamber is located in the high temperature box, the temperature in the high temperature chamber is adjustable, the high temperature box and the high temperature chamber have the closed isolation chamber between, the temperature in the isolation chamber is adjustable,

[0009] The first end of the pressure pipeline passes through the constant temperature equipment and is connected with the standard pressure source, and the second end of the pressure pipeline is connected with the high temperature chamber.

[0010] The pressure generator is connected with the pressure pipeline.

[0011] The pressure sensor is arranged on the high temperature chamber, and the pressure sensing surface of the pressure sensor is in contact with the medium in the high temperature chamber.

[0012] The pressure transmitter is arranged in the isolation chamber and is connected with the pressure sensor.

[0013] The data acquisition module is used for collecting the data of the standard pressure source, the pressure generator and the pressure transmitter.

[0014] Further, it further includes gas buffer, the pressure generator is connected with the gas buffer, and the gas buffer is connected with the pressure pipeline.

[0015] Further, it further includes control valve, the control valve is arranged on the gas buffer, the control valve is electrically connected with the data acquisition module, and the opening and closing of the control valve is controlled by the data acquisition module.

[0016] Further, the pressure pipeline includes a first pipe section and a second pipe section.

[0017] The first end of the first pipe section is connected with the standard pressure source, and the second end of the first pipe section is connected with the gas buffer after passing through the constant temperature equipment.

[0018] The pressure generator is connected with the first pipe section and the second pipe section respectively.

[0019] Further, it further includes first temperature sensor, fifth temperature sensor and sixth temperature sensor electrically connected with the data acquisition module.

[0020] the first temperature sensor is configured to detect a temperature of a portion of the first pipe segment between the standard pressure source and the constant temperature device;

[0021] the fifth temperature sensor is configured to detect a temperature in the isolation chamber;

[0022] the sixth temperature sensor is configured to detect a temperature in the high-temperature chamber.

[0023] Further, the data acquisition module is electrically connected to a second temperature sensor, a third temperature sensor, and a fourth temperature sensor.

[0024] the second temperature sensor is configured to detect a temperature in the constant temperature device;

[0025] the third temperature sensor is configured to detect a temperature of a portion of the first pipe segment between the constant temperature device and the gas buffer;

[0026] the fourth temperature sensor is configured to detect a temperature of a portion of the second pipe segment between the gas buffer and the high-temperature chamber.

[0027] Further, the first pipe segment comprises a corrugated pipe, which is located in the constant temperature device and maintained at a constant temperature by the constant temperature device.

[0028] Further, the constant temperature device comprises a constant temperature water tank, and the corrugated pipe segment is located in the constant temperature water tank.

[0029] Further, the high-temperature chamber is provided with a first temperature control assembly, which is configured to control a temperature in the isolation chamber.

[0030] The high-temperature chamber is provided with a second temperature control assembly, which is configured to control a temperature in the high-temperature chamber.

[0031] Further, a constant temperature range of the constant temperature device comprises 15-30℃, a temperature control range of the first temperature control assembly comprises 20-100℃, and a temperature control range of the second temperature control assembly comprises 50-600℃.

[0032] In the embodiment of the utility model, pressure pipeline, standard pressure source, constant temperature equipment, pressure generator, high temperature box, high temperature cavity, pressure sensor, pressure transmitter and data acquisition module are arranged, high temperature cavity is located in high temperature box, the temperature in high temperature cavity is adjustable, there is closed isolation cavity between high temperature box and high temperature cavity, the temperature in isolation cavity is adjustable, the first end of pressure pipeline passes through constant temperature equipment and is connected with standard pressure source, the second end of pressure pipeline is connected with high temperature cavity, pressure generator is connected with pressure pipeline, pressure sensor is arranged on high temperature cavity, the pressure sensing surface of pressure sensor contacts with the medium in high temperature cavity, pressure transmitter is arranged in isolation cavity and is connected with pressure sensor, data acquisition module is used for collecting the data of standard pressure source, pressure generator and pressure transmitter, reaches the purpose that can control the temperature of high temperature cavity and high temperature box in the detection process, establishes the test working condition of high temperature medium for pressure sensor and pressure transmitter, can control the temperature of constant temperature equipment simultaneously, establishes the test working condition of normal temperature medium for standard pressure source, thereby realizes the technical effect that can compare the pressure value detected by standard pressure source with the pressure value outputted by pressure transmitter under high temperature medium working condition to evaluate the measurement performance of pressure instrument under high temperature working condition, and further solves the problem that the measurement performance of pressure instrument under high temperature working condition cannot be tested in the performance test of pressure instrument under working condition environment in the related art. BRIEF DESCRIPTION OF DRAWINGS

[0033] The accompanying drawings, which form a part of this description, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The embodiments of the application illustrated in the drawings are presented by way of example or for purpose of illustration and not limitation.

[0034] Figure 1 It is the layout schematic view of test device in the embodiment of the utility model;

[0035] Among them, 1 first pipe section, 2 gas buffer, 3 pressure generator, 4 high temperature box, 5 isolation cavity, 6 pressure sensor, 7 pressure transmitter, 8 control valve, 9 constant temperature equipment, 10 standard pressure source, 11 data acquisition module, 12 first temperature sensor, 13 second temperature sensor, 14 third temperature sensor, 15 fourth temperature sensor, 16 second pipe section, 17 fifth temperature sensor, 18 sixth temperature sensor, 19 high temperature cavity. DETAILED DESCRIPTION

[0036] In order to make the person skilled in the art better understand the technical scheme of the present application, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0037] It should be noted that the terms "first", "second" and the like in the description and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so as to describe the embodiments of the present application described herein.

[0038] In the present application, the terms "upper", "lower", "inner", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0039] In addition, in addition to being used to indicate the orientation or positional relationship, the above-mentioned part of the terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. For those skilled in the art, the specific meaning of these terms in the present application can be understood according to the specific circumstances.

[0040] In addition, the terms "set", "provided with", "connected", "fixed" and the like should be broadly understood. For example, "connected" can be fixedly connected, detachably connected, or integrally constructed; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] In addition, the meaning of the term "a plurality of" should be two or more.

[0042] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0043] To solve the related technical problems, such as Figure 1As shown, the utility model embodiment provides a kind of pressure instrument performance testing device, comprising: pressure pipeline, standard pressure source 10, constant temperature equipment 9, gas buffer 2, pressure generator 3, high temperature box 4, high temperature cavity 19, pressure sensor 6, pressure transmitter 7 and data acquisition module 11;

[0044] Pressure pipeline includes first pipe section 1 and second pipe section 16, the first end of first pipe section 1 is connected with standard pressure source 10, the second end of first pipe section 1 is connected with gas buffer 2 after passing through constant temperature equipment 9;

[0045] High temperature cavity 19 is located in high temperature box 4, the temperature in high temperature cavity 19 is adjustable, high temperature box 4 and high temperature cavity 19 have closed isolation cavity 5 between, the temperature in isolation cavity 5 is adjustable;

[0046] The first end of second pipe section 16 is connected with gas buffer 2, and the second end of second pipe section 16 is connected with high temperature cavity 19;

[0047] Pressure generator 3 is connected with gas buffer 2;

[0048] Pressure sensor 6 is arranged on high temperature cavity 19, and the pressure sensing surface of pressure sensor 6 is in contact with the medium in high temperature cavity 19;

[0049] Pressure transmitter 7 is arranged in isolation cavity 5 and is connected with pressure sensor 6;

[0050] Data acquisition module 11 is used to collect the data of standard pressure source 10, pressure generator 3 and pressure transmitter 7.

[0051] As Figure 1 Shown, in the embodiment, standard pressure source 10, first pipe section 1, gas buffer 2, second pipe section 16 and high temperature cavity 19 are sequentially connected, high temperature cavity 19 is arranged in high temperature box 4, pressure generator 3 is connected with gas buffer 2, first pipe section 1 passes through constant temperature equipment 9, pressure sensor 6 is connected with high temperature cavity 19, high temperature box 4 and high temperature cavity 19 have closed isolation cavity 5 between, and pressure transmitter 7 is placed in isolation cavity 5.In the embodiment, constant temperature equipment 9 is used as the device capable of independent temperature control, which can control the medium temperature passing through constant temperature equipment 9 at normal temperature, and high temperature cavity 19 and high temperature box 4 can be independently temperature-controlled, wherein high temperature cavity 19 can be connected with medium after being connected with second pipe section 16, and a high-temperature working condition can be simulated by high temperature cavity 19, to provide a high-temperature environment for the pressure sensing surface of pressure sensor 6.

[0052] In one embodiment, the temperature of the high temperature chamber 19 can be adjusted in the range of 50°C to 500°C. The high temperature chamber 4 can control the temperature in the isolation chamber 5, so as to simulate the actual working environment of the pressure instrument, wherein the pressure sensor 6 is in the high temperature working condition in the high temperature chamber 19, and the rest of the pressure sensor 6 and the pressure transmitter 7 are in the environment simulated by the high temperature chamber 4 (i.e. in the isolation chamber 5). In one embodiment, the temperature of the isolation chamber 5 can be adjusted in the range of room temperature to 85°C.

[0053] In this embodiment, the test device can detect the measurement performance of the pressure sensor 6 and the pressure transmitter 7 in the high temperature working condition. Specifically, in the detection process, the temperature of the high temperature chamber 19, the isolation chamber 5 and the constant temperature device 9 can be controlled to a set temperature by the high temperature chamber 19, the high temperature chamber 4 and the constant temperature device 9, for example, the temperature in the high temperature chamber 19 is controlled to 300°C, the temperature in the isolation chamber 5 is controlled to 50°C, and the temperature of the constant temperature device 9 is controlled to 20°C. Then the gas medium is introduced into the gas buffer 2 by the pressure generator 3, and the gas medium enters the first pipe section 1 and the second pipe section 16 through the gas buffer 2. When the gas pressure value in the pipe section approaches the set target pressure value, the pressure generator 3 can be closed, and the pressure value in the pipe section is fine-tuned to the target pressure value, for example, 6MPa, by the standard pressure source 10. At this time, the medium temperature in the high temperature chamber 19 is about 300°C, the medium temperature through the constant temperature device 9 is about 20°C, and the environment temperature of the pressure transmitter 7 is about 50°C. The pressure value output by the pressure transmitter 7 and the pressure value output by the standard pressure source 10 can be read by the data acquisition module 11, and the measurement performance of the pressure sensor 6 and the pressure transmitter 7 in the current working condition can be evaluated by comparing the two pressure values.

[0054] It can be understood that the above specific numerical description of the high temperature chamber 19, the isolation chamber 5, the constant temperature device 9 and the target pressure value is not limiting, and those skilled in the art can set according to the actual detection standard. In addition, in the detection process, any one or more of the temperature in the high temperature chamber 19, the temperature in the isolation chamber 5 and the target pressure value can be detected as a variable, so as to evaluate the measurement performance of the pressure sensor 6 and the pressure transmitter 7 in multiple working conditions.

[0055] The utility model discloses a temperature control device for pressure instrument performance test under high temperature condition, which comprises a high temperature cavity, a high temperature box, a pressure sensor, a pressure transmitter, a constant temperature device and a standard pressure source.

[0056] In an embodiment, the constant temperature device 9 can be a constant temperature water tank, and the first pipe section 1 passes through the constant temperature water tank, so that the part of the first pipe section 1 located in the constant temperature water tank can be kept at a normal temperature, thereby making the gas medium contacted by the standard pressure source 10 be a normal temperature medium. Of course, the constant temperature device 9 can also adopt other types, for example, a constant temperature box, which makes the space in the constant temperature box be in a constant temperature state by a similar air conditioning manner. The pressure generator 3 comprises an air compressor and the like.

[0057] In the embodiment, the gas buffer 2 is arranged to eliminate the influence of the volume expansion of the gas caused by the temperature change on the detection result. Specifically, the arrangement of the gas buffer 2 increases the volume of the entire pressure pipeline, and when the gas medium in the high temperature cavity 19 is affected by the temperature and expands in volume, the gas buffer 2 with a large volume can absorb the volume expansion of the gas to some extent, thereby reducing the influence of the gas expansion on the entire pressure pipeline, and further reducing the fluctuation of the pressure value detection. In addition, in the embodiment, the pressure generator 3 can quickly fill the gas buffer 2, which can significantly improve the experimental efficiency. Moreover, due to the presence of the gas buffer 2, the high-pressure gas output by the pressure generator 3 will not directly impact the pressure sensor 6, thereby reducing the influence on the pressure sensor 6.

[0058] In an embodiment, the data acquisition module 11 can be electrically connected to the standard pressure source 10, the pressure generator 3 and the pressure transmitter 7 in a wired or wireless manner as a signal acquisition end to acquire corresponding data. In another embodiment, the data acquisition module 11 can also be a control end to control the pressure transmitter 7 to input gas into the gas buffer 2 and control the standard pressure source 10 to adjust the gas pressure of the pressure pipeline.

[0059] Since the temperature control device in the utility model simulates the measurement performance of the pressure instrument under high temperature, the temperature detection of part of the area in the test device is more important. Therefore, as shown in Figure 1As shown, the testing device in the embodiment further comprises a first temperature sensor 12, a second temperature sensor 13, a third temperature sensor 14, a fourth temperature sensor 15, a fifth temperature sensor 17 and a sixth temperature sensor 18 electrically connected with the data acquisition module 11.

[0060] The first temperature sensor 12 is used to detect the temperature of the portion of the first pipe segment 1 between the standard pressure source 10 and the constant temperature device 9.

[0061] The second temperature sensor 13 is used to detect the temperature in the constant temperature device 9.

[0062] The third temperature sensor 14 is used to detect the temperature of the portion of the first pipe segment 1 between the constant temperature device 9 and the gas buffer 2.

[0063] The fourth temperature sensor 15 is used to detect the temperature of the portion of the second pipe segment 16 between the gas buffer 2 and the high-temperature tank 4.

[0064] The fifth temperature sensor 17 is used to detect the temperature in the isolation chamber 5.

[0065] The sixth temperature sensor 18 is used to detect the temperature in the high-temperature chamber 19.

[0066] Specifically, in the embodiment, the first temperature sensor 12 arranged on the first pipe segment 1 and located between the standard pressure source 10 and the constant temperature device 9 is used to obtain the temperature of the gas medium in contact with the standard pressure source 10, so as to ensure that the temperature of the gas medium in contact with the standard pressure source 10 is the constant temperature set. The second temperature sensor 13 is used to detect the temperature in the constant temperature device 9, so as to ensure that the constant temperature controlled by the constant temperature device 9 is the constant temperature set. The third temperature sensor 14 arranged on the first pipe segment 1 and located between the constant temperature device 9 and the gas buffer 2 is used to obtain the temperature of the gas medium before entering the constant temperature device 9, so that the constant temperature device 9 can adjust the temperature of the constant temperature device 9 based on the temperature of the gas medium, so that the temperature of the gas medium in contact with the standard pressure source 10 is the constant temperature.

[0067] The fourth temperature sensor 15 arranged on the second pipe segment 16 and located between the gas buffer 2 and the high-temperature tank 4 is used to obtain the temperature of the gas medium before entering the high-temperature tank 4, and the fifth temperature sensor 17 arranged in the isolation chamber 5 is used to detect the temperature in the isolation chamber 5, so as to ensure that the temperature of the environment in which the pressure transmitter 7 and the portion of the pressure sensor 6 except the sensing surface are located is the temperature set. The sixth temperature sensor 18 arranged in the high-temperature chamber 19 is also used to obtain the temperature of the gas medium in the high-temperature chamber 19, so as to ensure that the temperature of the gas medium is the temperature set under the high-temperature working condition.

[0068] In this embodiment, the data acquisition module 11 is also electrically connected to the first temperature sensor 12, the second temperature sensor 13, the third temperature sensor 14, the fourth temperature sensor 15, the fifth temperature sensor 17 and the sixth temperature sensor 18, so as to centrally acquire the temperature detected by each temperature sensor, thereby facilitating the control of the entire testing device.

[0069] In one implementation, such as Figure 1 As shown, the first pipe section 1 includes a corrugated pipe, which is located inside the temperature control device 9 and is kept at a constant temperature by the temperature control device 9.

[0070] Specifically, in this embodiment, the portion of the first pipe section 1 located inside the constant temperature device 9 is configured as a corrugated pipe, which significantly increases the contact area between the first pipe section 1 and the constant temperature device 9. Taking the constant temperature device 9 as a constant temperature water bath as an example, the corrugated pipe on the first pipe section 1 is located inside the constant temperature water bath. The larger contact area allows the gas inside the corrugated pipe to be kept at the set ambient temperature, which is beneficial for the standard pressure source 10 to detect the pressure of the gas at ambient temperature.

[0071] To facilitate pressure relief of the pipeline after testing, such as Figure 1 As shown, the testing device in this embodiment also includes a control valve 8, which is located on the gas buffer 2. The control valve 8 is electrically connected to the data acquisition module 11, and the data acquisition module 11 controls the opening and closing of the control valve 8.

[0072] After the control valve 8 is electrically connected to the data acquisition module 11, the data acquisition module 11 needs to keep the control valve 8 in the closed state before starting the test. After the test is completed, the data acquisition module 11 can open the control valve 8 to relieve pressure in the pipeline. In this embodiment, the control valve 8 can be any type of electrically controlled valve, such as a solenoid valve, a slide gate valve, etc.

[0073] To facilitate temperature control within the high-temperature chamber 4 and the high-temperature cavity 19, a first temperature control component is provided inside the high-temperature chamber 4 in this embodiment. The first temperature control component is used to control the temperature inside the isolation cavity 5.

[0074] A second temperature control component is provided inside the high-temperature chamber 19, which is used to control the temperature inside the high-temperature chamber 19.

[0075] Specifically, in one embodiment, the first temperature control component and the second temperature control component can be a heating rod, a heating wire, etc.

[0076] In one embodiment, the temperature control range of the constant temperature device includes 15-30°C, the temperature control range of the first temperature control component includes 20-100°C, and the temperature control range of the second temperature control component includes 50-600°C.

[0077] According to another aspect of the utility model, provide a kind of pressure instrument performance test method, using the pressure instrument performance test device described above, and comprising following steps:

[0078] S100, the temperature in high-temperature cavity 19 is controlled at first temperature value T6, the temperature in isolation cavity 5 is controlled at second temperature value T5, wherein, 200 DEG C ≤T6 ≤500 DEG C, 20 DEG C ≤T5 ≤90 DEG C;In specific embodiment, according to different side view working conditions, first temperature value T6 and second temperature value T5 can select a specific value in corresponding range.

[0079] S200, set target pressure value, by pressure generator 3, fill the gas buffer 2 in the gas medium to be measured, first pipe section 1 and second pipe section 16 are filled with the gas medium to be measured, when the pressure value in first pipe section 1 and second pipe section 16 is close to target pressure value, close pressure generator 3;In specific embodiment, according to different test working conditions, target pressure value also has different selection, can be determined according to test specification target pressure value under corresponding test working condition.

[0080] S300, by thermostat equipment 9, the temperature of the gas medium to be measured passing through thermostat equipment 9 is controlled at T2, 15 DEG C ≤T2 ≤25 DEG C;In specific embodiment, thermostat equipment 9 is used to control the temperature of the gas medium to be measured at normal temperature, generally needs to be controlled at (20±2) DEG C.

[0081] S400, by standard pressure source 10, the pressure value in first pipe section 1 and second pipe section 16 is pressure fine-tuned, to make the pressure value obtained by standard pressure source 10 reach target pressure value;

[0082] S500, obtain the measurement pressure value output by pressure transmitter 7;

[0083] S600, based on target pressure value and measurement pressure value, determine the error value between first measurement pressure value and target pressure value.

[0084] S700, respectively, target pressure value, first temperature value and second temperature value are used as the only variable of test working condition, obtain the error value between first measurement pressure value and target pressure value under multiple test working conditions.

[0085] In the utility model, by the test method, the measurement performance of pressure instrument under different test working conditions can be tested and evaluated, solve the problem that the measurement performance of pressure instrument cannot be evaluated in high-temperature working condition in the related art.

[0086] In the embodiment, three variables need to be controlled in the performance test of the pressure instrument, which are the target pressure value in the pressure pipeline, the first temperature value in the high-temperature cavity 19, and the second temperature value in the isolation cavity 5 of the high-temperature box 4.

[0087] In a specific embodiment, a pressure instrument with an accuracy of 0.5 level is taken as the test object, the pressure measurement range is 0-6 MPa, and the measurement medium temperature range is 50-500°C.

[0088] According to the existing verification regulation JJG875 digital pressure gauge, the verification needs to be performed in a (20±2) °C environment, ignoring the influence of the actual temperature on the pressure measurement value. Usually, the tested pressure instrument needs to be measured at six points of 0.2 MPa, 3 MPa, 4 MPa, 5 MPa, and 6 MPa, and the maximum allowable error is ±0.5%.

[0089] The maximum allowable error calculation formula is:

[0090]

[0091] Test:

[0092] δ: maximum allowable error;

[0093] p r : measurement point positive and negative stroke indication;

[0094] p s : measurement point standard value;

[0095] p N : maximum measurement value.

[0096] Table 1. Error of the measured pressure instrument in the standard environment (20±2) °C

[0097]

[0098] As shown in Table 1, the measured pressure instrument in the standard environment is completely in line with the requirements.

[0099] In order to test the measurement performance of the pressure instrument under high-temperature working conditions, the following tests are performed:

[0100] Test condition one:

[0101] The first temperature value T6 in the high-temperature cavity 19 is set to 300°C, the second temperature value T5 in the isolation cavity is set to (50±2) °C, the temperature of the gas medium passing through the constant temperature device is controlled to T2 in (20±2) °C by the constant temperature device. The target pressure value is set to five measurement points, which are 2 MPa, 3 MPa, 4 MPa, 5 MPa, and 6 MPa, and the test results are shown in Table 2:

[0102] Table 2 error of measured pressure instrument under high temperature

[0103]

[0104] Table 2 shows that the error of the measured pressure instrument under the test working condition environment changes significantly compared with the error under the standard environment.

[0105] Test working condition two:

[0106] The target pressure value is set to 6 MPa, the second temperature value T5 in the isolation cavity is set to (50±2) °C, and the temperature of the gas medium to be measured passing through the constant temperature device is controlled to T2 at (20±2) °C by the constant temperature device. The first temperature value T6 in the high temperature cavity 19 is measured as a variable at 50 °C, 100 °C, 200 °C, 400 °C, and 600 °C, and the measurement pressure value is measured in turn. The results are shown in Table 3:

[0107] Table 3 error of measured pressure instrument under high temperature

[0108]

[0109] Table 3 shows that under the same pressure condition, the measurement error of the measured pressure instrument changes with the temperature of the measurement medium, and the measurement error changes significantly compared with the standard environment.

[0110] Test working condition three:

[0111] The target pressure value is set to 6 MPa, the first temperature value T6 in the high temperature cavity 19 is set to 300 °C, and the temperature of the gas medium to be measured passing through the constant temperature device is controlled to T2 at (20±2) °C by the constant temperature device. The second temperature value T5 in the isolation cavity is set as a variable, and the measurement pressure value is measured at 25 °C, 50 °C, and 80 °C in turn. The test results are shown in Table 4:

[0112] Table 4 error of measured pressure instrument under high temperature

[0113]

[0114] According to the above test method, the pressure measurement value and error value of the measured pressure instrument under different high temperature test working conditions can be obtained. In order to enable the measured pressure instrument to output accurate pressure measurement value under high temperature working condition, it is necessary to correct the pressure instrument according to the test results obtained, so that the pressure instrument can output pressure measurement value with error value within the allowable range based on the current test environment.

[0115] Specifically, the pressure instrument mainly includes a pressure sensor 6 and a pressure transmitter 7, wherein the pressure sensor 6 is internally provided with a sensitive element, which converts a pressure value into an original electric signal and transmits the original electric signal to the pressure transmitter 7, and the pressure transmitter 7 processes the electric signal by methods such as filtering, and then converts the electric signal into a standard signal commonly used in industry, such as (4-20) mA, 0-5 V, etc. Finally, the measurement result is output as the standard signal by the pressure transmitter 7.

[0116] Generally, each pressure sensor 6 has its own characteristics, and the original signal output by the sensor needs to be processed to a fixed value before being normally used in the measurement process. The fixed value process is called calibration or calibration. The fixed value work is completed by the pressure transmitter 7. At present, the pressure transmitter 7 is generally provided with a microprocessor, and the fixed value process can compare the measurement value with the standard value, correct the error in the processor by using a mathematical algorithm, and output the correct pressure value. Since the temperature has a certain influence on the measurement value of the pressure sensor 6, only the information output by the pressure sensor 6 is corrected under the actual temperature environment condition, the pressure value under the working condition environment can be accurately obtained.

[0117] In an embodiment, the data obtained by the test method can be subjected to curve fitting, and specifically, an interpolation method or the like can be used for curve fitting. According to the fitting result, a pressure correction equation algorithm is formulated, and the pressure correction equation algorithm is built into the processor of the pressure transmitter 7 to correct the pressure measurement result and output the correct measurement pressure value. After the above-mentioned test device and test method are used, the combination of the working environment temperature, the measurement medium temperature, and the target pressure measurement value can be adjusted as needed, and finally a suitable correction equation is formed to calibrate the measured pressure instrument, so as to ensure the accuracy of the measurement result under the expected working condition of the measured pressure instrument.

[0118] Based on this, the test method in the embodiment further includes:

[0119] S800, determining whether the pressure sensor 6 meets the metrological performance requirement according to the error value, if not,

[0120] S900, performing curve fitting based on the measurement pressure value and the target pressure value, and determining a correction mode based on the curve fitting result;

[0121] S1000, correcting the pressure transmitter 7 based on the correction mode, so that the error of the pressure value output by the pressure transmitter 7 meets the metrological performance requirement.

[0122] To further verify the corrected pressure transmitter 7, the test method in the embodiment further includes:

[0123] S1100, performing S100-S800 by using the corrected pressure transmitter 7, and if yes, ending the performance detection.

[0124] In other words, the corrected pressure transmitter 7 is tested again in the embodiment, the measurement performance of the corrected pressure transmitter 7 is evaluated according to the measured pressure values and error values under different test conditions, and when the evaluation meets the measurement performance requirements, the pressure instrument can output accurate measurement pressure values under different environmental conditions.

[0125] Since the measurement performance of the pressure instrument under high-temperature conditions needs to be tested, the temperature values at the key positions of the test device need to be strictly controlled to ensure the accuracy of the test results. Therefore, before step S400 is performed, the embodiment further includes:

[0126] obtaining the detected temperature values detected by the first temperature sensor 12, the second temperature sensor 13, the third temperature sensor 14, the fourth temperature sensor 15, the fifth temperature sensor 17 and the sixth temperature sensor 18; in a specific embodiment, the corresponding detected temperature values are obtained by the data acquisition module 11 in a wired or wireless manner;

[0127] determining whether the temperatures of the parts of the test device meet the test requirements based on the detected temperature values, and if yes, performing step S400;

[0128] If not, the test device is checked and debugged.

[0129] The above only describes the preferred embodiments of the utility model, and is not used to limit the utility model. For those skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A pressure gauge performance testing device, characterized by, The device comprises a pressure pipeline, a standard pressure source, a constant temperature device, a pressure generator, a high-temperature box, a high-temperature cavity, a pressure sensor, a pressure transmitter and a data acquisition module. The high-temperature cavity is arranged in the high-temperature box, the temperature in the high-temperature cavity is adjustable, and the high-temperature box and the high-temperature cavity have a closed isolation cavity therebetween, and the temperature in the isolation cavity is adjustable. The first end of the pressure pipeline passes through the constant temperature device and is connected with the standard pressure source, and the second end of the pressure pipeline is connected with the high-temperature cavity. The pressure generator is connected with the pressure pipeline. The pressure sensor is arranged on the high-temperature cavity, and the pressure sensing surface of the pressure sensor is in contact with the medium in the high-temperature cavity. The pressure transmitter is arranged in the isolation cavity and is connected with the pressure sensor. The data acquisition module is used for acquiring data of the standard pressure source, the pressure generator and the pressure transmitter. The device further comprises a gas buffer, the pressure generator is connected with the gas buffer, and the gas buffer is connected with the pressure pipeline.

2. The pressure gauge performance testing device of claim 1, wherein, The device further comprises a control valve arranged on the gas buffer, the control valve is electrically connected with the data acquisition module, and the opening and closing of the control valve is controlled by the data acquisition module.

3. The pressure gauge performance testing device of claim 2, wherein, The pressure pipeline comprises a first pipe section and a second pipe section.

4. The pressure gauge performance testing device of claim 3, wherein, The first end of the first pipe section is connected with the standard pressure source, and the second end of the first pipe section is connected with the gas buffer after passing through the constant temperature device. The pressure generator is connected with the first pipe section and the second pipe section respectively. The device further comprises a first temperature sensor, a fifth temperature sensor and a sixth temperature sensor electrically connected with the data acquisition module.

5. The pressure gauge performance testing device of claim 4, wherein, The first temperature sensor is used for detecting the temperature of the part of the first pipe section between the standard pressure source and the constant temperature device. The fifth temperature sensor is used for detecting the temperature in the isolation cavity. The sixth temperature sensor is used for detecting the temperature in the high-temperature cavity. The device further comprises a second temperature sensor, a third temperature sensor and a fourth temperature sensor electrically connected with the data acquisition module.

6. The pressure gauge performance testing device of claim 5, wherein, The second temperature sensor is used for detecting the temperature in the constant temperature device. The third temperature sensor is used for detecting the temperature of the part of the first pipe section between the constant temperature device and the gas buffer. The fourth temperature sensor is used for detecting the temperature of the part of the second pipe section between the gas buffer and the high-temperature box. The first pipe section comprises a corrugated pipe, and the corrugated pipe is arranged in the constant temperature device and kept at a constant temperature by the constant temperature device.

7. The pressure gauge performance testing device of claim 4, wherein, The constant temperature device comprises a constant temperature water tank, and the corrugated pipe section is arranged in the constant temperature water tank.

8. The pressure gauge performance testing device of claim 7, wherein, The high-temperature box is provided with a first temperature control assembly for controlling the temperature in the isolation cavity.

9. The pressure gauge performance testing device of claim 1, wherein, The high-temperature cavity is provided with a second temperature control assembly for controlling the temperature in the high-temperature cavity. The constant temperature range of the constant temperature device comprises 15-30℃, the temperature control range of the first temperature control assembly comprises 20-100℃, and the temperature control range of the second temperature control assembly comprises 50-600℃.

10. The pressure gauge performance testing device of claim 9, wherein, ​

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