Differential pressure sensor calibration device

Abstract

The utility model discloses a differential pressure sensor calibration device which comprises an air supply system, a first air supply branch pipe, a second air supply branch pipe, a first pipeline, a second pipeline, an exhaust pipeline, a reference differential pressure sensor, a first pressure sensor, a second pressure sensor, a temperature sensor and a heating device. The first pipeline and the second pipeline are arranged in parallel, the two ends of the first pipeline are communicated with the two ends of the second pipeline respectively, the two ends of the first pipeline are communicated with the first air supply branch pipe and the second air supply branch pipe respectively, and the first pipeline is provided with a heating device, a temperature sensor and a differential pressure sensor installation position. The device has the advantages that the whole device is simple in structure, the corresponding differential pressure at high temperature and high static pressure can be tested, data can be obtained, whether the differential pressure sensor meets error requirements or not can be verified, program calibration can be written according to the measured data, and therefore differential pressure calibration can be conducted on the differential pressure sensor at different temperatures and different static pressures; the precision of the differential pressure sensor is improved and production requirements are met.

Description

Technical Field

[0001] The utility model relates to the technical field of differential pressure sensor calibration, and specifically to a differential pressure sensor calibration device. The differential pressure sensor calibrated by the differential pressure sensor calibration device is currently mainly used in downhole supercritical CO2 flowmeter projects. However, the differential pressure sensor calibrated by the calibration device is not limited to this project and the measuring medium, and can be used in any application scenario using a differential pressure sensor, including but not limited to various media and various medium forms (gaseous, liquid, supercritical, etc.). Background Art

[0002] In oilfield gas injection and oil recovery equipment, a differential pressure flowmeter is used to calculate the flow rate. In the existing technology, the calibration of the differential pressure sensor is to test the static pressure of one atmosphere and the differential pressure accuracy at room temperature. In order to ensure that the error at different temperatures and different static pressures is as small as possible, the differential pressure sensor needs to be calibrated at different temperatures and static pressures. Therefore, it is necessary to design a differential pressure sensor calibration device to solve the above technical problems. Utility Model Content

[0003] To this end, the utility model provides a differential pressure sensor calibration device to solve the above-mentioned problems in the prior art.

[0004] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0005] According to a first aspect of the present utility model, a differential pressure sensor calibration device includes an air supply system, a first air supply branch pipe, a second air supply branch pipe, a first pipeline, a second pipeline, an exhaust pipeline, a reference differential pressure sensor, a first pressure sensor, a second pressure sensor, a temperature sensor, and a heating device, wherein the first air supply branch pipe and the second air supply branch pipe are both connected to the air supply system, and the first air supply branch pipe and the second air supply branch pipe are respectively provided with a first valve and a second valve;

[0006] The first pipeline and the second pipeline are arranged in parallel, and the two ends of the first pipeline are respectively connected to the two ends of the second pipeline, and the two ends of the first pipeline are respectively connected to the first gas supply branch pipe and the second gas supply branch pipe. The first pipeline is provided with the heating device, the temperature sensor, and the differential pressure sensor installation position. The temperature sensor and the differential pressure sensor installation position are both located in the heating device. The differential pressure sensor installation position is used to install the differential pressure sensor to be calibrated;

[0007] The reference differential pressure sensor, the first pressure sensor and the second pressure sensor are all arranged on the second pipeline, and the reference differential pressure sensor is arranged between the first pressure sensor and the second pressure sensor;

[0008] The exhaust pipeline is communicated with the second air supply branch pipe, and a third valve is provided on the exhaust pipeline.

[0009] Furthermore, the air supply system includes an air supply device, an air supply pipe and a booster pump, one end of the air supply pipe is connected to the air supply end of the air supply device, the other end of the air supply pipe is connected to the first air supply branch pipe and the second air supply branch pipe, and the booster pump is arranged on the air supply pipe.

[0010] Furthermore, the air supply device adopts an air tank or an air compressor.

[0011] Furthermore, the heating device adopts a heating belt or a heating jacket.

[0012] Furthermore, both the first pressure sensor and the second pressure sensor are digital pressure sensors.

[0013] Furthermore, the temperature sensor is a digital temperature sensor.

[0014] Furthermore, the first valve, the second valve and the third valve are all manual valves.

[0015] The utility model has the following advantages: the entire device has a simple structure, can test the differential pressure corresponding to high temperature and high static pressure, obtain data, verify whether the differential pressure sensor meets the error requirements, and can write a calibration program based on the measured data, thereby calibrating the differential pressure sensor under different temperatures and different static pressures, improving the accuracy of the differential pressure sensor, and meeting production requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely illustrative, and those skilled in the art can derive other implementation drawings based on the provided drawings without inventive effort.

[0017] The structures, proportions, sizes, etc. illustrated in this specification are intended solely to complement the contents disclosed herein and to facilitate understanding and reading by persons skilled in the art. They are not intended to limit the conditions under which the present invention may be implemented and therefore have no substantive technical significance. Any structural modifications, changes in proportions, or adjustments in size, provided they do not affect the efficacy and objectives of the present invention, shall remain within the scope of the technical contents disclosed herein.

[0018] Figure 1 A schematic structural diagram of a differential pressure sensor calibration device provided in some embodiments of the present invention.

[0019] In the figure: 1. Booster pump, 2. Reference differential pressure sensor, 3. First pressure sensor, 4. Second pressure sensor, 5. Temperature sensor, 6. Differential pressure sensor to be calibrated, 7. Heating device, 8. Air supply pipe, 9. First air supply branch pipe, 10. Second air supply branch pipe, 11. First pipeline, 12. Second pipeline, 13. Exhaust pipeline, 14. First valve, 15. Second valve, 16. Third valve. DETAILED DESCRIPTION

[0020] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can readily understand the other advantages and benefits of the present invention from the contents disclosed in this specification. Obviously, the embodiments described are only a portion of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0021] like Figure 1 As shown, a differential pressure sensor calibration device in an embodiment of the first aspect of the present invention includes an air supply system, a first air supply branch pipe 9, a second air supply branch pipe 10, a first pipeline 11, a second pipeline 12, an exhaust pipeline 13, a reference differential pressure sensor 2, a first pressure sensor 3, a second pressure sensor 4, a temperature sensor 5 and a heating device 7. The first air supply branch pipe 9 and the second air supply branch pipe 10 are both connected to the air supply system, and the first air supply branch pipe 9 and the second air supply branch pipe 10 are respectively provided with a first valve 14 and a second valve 15;

[0022] The first pipeline 11 and the second pipeline 12 are arranged in parallel, and the two ends of the first pipeline 11 are respectively connected to the two ends of the second pipeline 12, and the two ends of the first pipeline 11 are respectively connected to the first gas supply branch pipe 9 and the second gas supply branch pipe 10. The first pipeline 11 is provided with a heating device 7, a temperature sensor 5 and a differential pressure sensor mounting position. The temperature sensor 5 and the differential pressure sensor mounting position are both located in the heating device 7. The temperature sensor 5 adopts a digital temperature sensor, and the differential pressure sensor mounting position is used to install the differential pressure sensor 6 to be calibrated; the heating device 7 adopts a heating belt or a heating sleeve. By covering the heating belt or the heating sleeve on the outside of the differential pressure sensor 6 to be calibrated and the temperature sensor 5, the temperature of the differential pressure sensor 6 to be calibrated is controlled, and the pressure difference data at different temperatures can be measured;

[0023] The reference differential pressure sensor 2, the first pressure sensor 3 and the second pressure sensor 4 are all arranged on the second pipeline 12, and the reference differential pressure sensor 2 is arranged between the first pressure sensor 3 and the second pressure sensor 4. The first pressure sensor 3 and the second pressure sensor 4 are both digital pressure sensors.

[0024] The exhaust pipeline 13 is in communication with the second gas supply branch pipe 10 , and a third valve 16 is provided on the exhaust pipeline 13 .

[0025] In this embodiment, it should be noted that the reference differential pressure sensor 2 is a sensor with higher accuracy than the differential pressure sensor to be calibrated 6, and it is calibrated, and the data measured by it is the reference data;

[0026] The first valve 14, the second valve 15 and the third valve 16 are all manual valves;

[0027] The air supply system includes an air supply device, an air supply pipe 8 and a booster pump 1. One end of the air supply pipe 8 is connected to the air supply end of the air supply device, and the other end of the air supply pipe 8 is connected to the first air supply branch pipe 9 and the second air supply branch pipe 10. The booster pump 1 is arranged on the air supply pipe 8; specifically, the air supply device can adopt an air tank or an air compressor.

[0028] For further illustration, a differential pressure sensor with a differential pressure range of 100 kPa, a maximum static pressure of 60 MPa, and a maximum temperature resistance of 150°C is calibrated. To measure the differential pressure corresponding to a static pressure of 50 MPa and a temperature of 80°C, the first valve 14 and the second valve 15 are first opened, and the third valve 16 is closed. The pressure in the pipeline is slowly increased by the booster pump 1, while heating is performed by the heater 7. The temperature is monitored by the temperature sensor 5, and the pressure is monitored by the first pressure sensor 3 and the second pressure sensor 4. The pressure and temperature can be increased simultaneously or alternately. When the static pressure reaches 50 MPa and the temperature reaches 80°C, the first valve 14 and the second valve 15 are closed. At this point, the static pressure on both sides of the differential pressure sensor 6 to be calibrated is 50 MPa, and the temperature on both sides of the differential pressure sensor 6 to be calibrated is 80°C. A set of zero differential pressure readings (i.e., the readings of the reference differential pressure sensor 2 and the differential pressure sensor 6 to be calibrated) is first extracted as the zero point of the calibration differential pressure sensor. Then, different differential pressure values are calibrated. The specific method is as follows: open the second valve 15 to release a small amount of gas, then close the second valve 15 to observe whether the reference differential pressure sensor 2 reaches the differential pressure value to be calibrated. If it reaches the differential pressure value, calibrate it. If not, continue to release a small amount of gas in the pipeline (note that the second valve 15 should not be opened too quickly to prevent the differential pressure value of the differential pressure sensor from exceeding the maximum range);

[0029] The above example only calibrates a set of data. The same process can be used to calibrate more data. For example, for the differential pressure sensor above, the static pressure is 0MPa, 10MPa, 20MPa, 30MPa, 40MPa, 50MPa, and 60MPa, the temperature is 10℃, 30℃, 50℃, 70℃, 90℃, 110℃, 130℃, and 150℃, and the differential pressure is 0KPa, 20KPa, 40KPa, 60KPa, 80KPa, and 100KPa for full measurement calibration. After calibration, these data are written into the flowmeter program. Through the interpolation algorithm, the measurement accuracy of the differential pressure sensor can be improved, thereby improving the accuracy of the differential pressure flowmeter and meeting and optimizing production requirements. It should be noted that the above example uses a differential pressure flowmeter, but improving the accuracy of the differential pressure sensor and reducing the error can be applied to any equipment that uses a differential pressure sensor. This method is not limited to high temperature and high static pressure conditions, but can also be used in normal temperature and high static pressure conditions.

[0030] The technical effect achieved by this embodiment is as follows: the entire device has a simple structure, can test the differential pressure corresponding to high temperature and high static pressure, obtain data, verify whether the differential pressure sensor meets the error requirements, and can write a calibration program based on the measured data, thereby calibrating the differential pressure sensor at different temperatures and different static pressures, improving the accuracy of the differential pressure sensor, and meeting production requirements.

[0031] Although the present invention has been described in detail above using general descriptions and specific embodiments, it will be apparent to those skilled in the art that modifications or improvements may be made to the present invention. Therefore, such modifications or improvements, without departing from the spirit of the present invention, are within the scope of protection claimed herein.

[0032] The terms "upper", "lower", "left", "right", "middle", etc. used in this specification are only for the convenience of description and are not intended to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should be considered as the scope of implementation of the present invention without substantially changing the technical content.

Claims

1. A differential pressure sensor calibration device, characterized in that: The invention comprises an air supply system, a first air supply branch pipe (9), a second air supply branch pipe (10), a first pipeline (11), a second pipeline (12), an exhaust pipeline (13), a reference differential pressure sensor (2), a first pressure sensor (3), a second pressure sensor (4), a temperature sensor (5) and a heating device (7); the first air supply branch pipe (9) and the second air supply branch pipe (10) are both connected to the air supply system; the first air supply branch pipe (9) and the second air supply branch pipe (10) are respectively provided with a first valve (14) and a second valve (15); The first pipeline (11) and the second pipeline (12) are arranged in parallel, the two ends of the first pipeline (11) are respectively connected to the two ends of the second pipeline (12), and the two ends of the first pipeline (11) are respectively connected to the first gas supply branch pipe (9) and the second gas supply branch pipe (10), the first pipeline (11) is provided with the heating device (7), the temperature sensor (5) and the differential pressure sensor installation position, the temperature sensor (5) and the differential pressure sensor installation position are both located in the heating device (7), and the differential pressure sensor installation position is used for installing the differential pressure sensor (6) to be calibrated; The reference differential pressure sensor (2), the first pressure sensor (3) and the second pressure sensor (4) are all arranged on the second pipeline (12), and the reference differential pressure sensor (2) is arranged between the first pressure sensor (3) and the second pressure sensor (4); The exhaust pipeline (13) is in communication with the second air supply branch pipe (10), and a third valve (16) is provided on the exhaust pipeline (13).

2. A differential pressure sensor calibration device according to claim 1, characterized in that: The air supply system comprises an air supply device, an air supply pipe (8) and a booster pump (1); one end of the air supply pipe (8) is connected to the air supply end of the air supply device, and the other end of the air supply pipe (8) is connected to the first air supply branch pipe (9) and the second air supply branch pipe (10); and the booster pump (1) is arranged on the air supply pipe (8).

3. A differential pressure sensor calibration device according to claim 2, characterized in that: The air supply device adopts an air tank or an air compressor.

4. A differential pressure sensor calibration device according to claim 1, characterized in that: The heating device (7) adopts a heating belt or a heating jacket.

5. A differential pressure sensor calibration device according to claim 1, characterized in that: The first pressure sensor (3) and the second pressure sensor (4) are both digital pressure sensors.

6. A differential pressure sensor calibration device according to claim 1, characterized in that: The temperature sensor (5) is a digital temperature sensor.

7. A differential pressure sensor calibration device according to claim 1, characterized in that: The first valve (14), the second valve (15) and the third valve (16) are all manual valves.

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