CN112924001A - Variable medium positive pressure method gas flow standard device - Google Patents
Variable medium positive pressure method gas flow standard device Download PDFInfo
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- CN112924001A CN112924001A CN202110328175.5A CN202110328175A CN112924001A CN 112924001 A CN112924001 A CN 112924001A CN 202110328175 A CN202110328175 A CN 202110328175A CN 112924001 A CN112924001 A CN 112924001A
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- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
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Abstract
The invention relates to the technical field of gas flow standard devices, and discloses a variable medium positive pressure method gas flow standard device which comprises an air compressor and a high-purity compressed gas tank, wherein the air compressor is connected with a gas purification device through a pipeline, the gas purification device is connected to one end of a gas storage tank through a pipeline, and the high-purity compressed gas tank is connected to the other end of the gas storage tank through a pipeline. The standard flowmeter of the variable medium positive pressure method gas flow standard device is at positive pressure and adjustable pressure, and the detected flowmeter works at normal pressure; the variable medium positive pressure method gas flow standard device adopts a heat exchanger and a constant temperature water bath tank to stabilize the temperature of a medium, and performs coefficient compensation on a standard flowmeter in the pressure adjusting process; the output end of the detected flowmeter is also connected with a vacuum pump through a pipeline, and the vacuum pump not only improves the pressure ratio, but also increases the flow range of the detected flowmeter.
Description
Technical Field
The invention relates to the technical field of gas flow standard devices, in particular to a variable medium positive pressure method gas flow standard device.
Background
A gas flow meter is a meter for measuring the flow of gas, which is installed in a pipeline for recording the amount of gas flowing through. After long-time use, the gas flowmeter inevitably has metering errors, and at the moment, a gas flow standard device is used for calibrating or calibrating the gas flowmeter.
However, in practical applications, we have found that the conventional gas flow rate standard device still has certain disadvantages, such as:
1. most of gas flowmeters are used in a positive pressure state, the working pressure of the flowmeter is higher than the local atmospheric pressure, but most of the traditional gas flow standard devices are negative pressure method gas flow standard devices, the flowmeter used in the positive pressure state can only finish verification or calibration by using the negative pressure method gas flow standard devices, the phenomenon that the verification or calibration conditions are inconsistent with the actual working condition is existed, and the flow quantity value can not be accurately reproduced easily;
2. for a gas flowmeter with large pressure loss, the inlet pressure of the detected flowmeter is required to be more than 0.2 MPa-0.5 MPa to normally work, and the current gas flow standard device cannot be applied;
3. in the existing gas flow standard device, the working pressures of the detected flowmeter and the standard flowmeter are basically consistent, and the detected flowmeter and the standard flowmeter work in a positive pressure state or a normal pressure state, so that the application range of the gas flow standard device is small;
4. the current gas flow standard device only can use a single medium as a detection working medium (such as air), while the medium used by the actual working condition of the gas flowmeter is not only one medium of air, and the gas flowmeter using various media for the actual working condition of the flowmeter can only use the air flow standard device for detection, and the flow quantity value is inaccurate due to the inconsistency of the detection media.
Based on this, we propose a variable medium positive pressure method gas flow standard device, hopefully solve the deficiencies in the prior art.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a variable medium positive pressure method gas flow standard device to solve the problems in the background technology.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: a variable medium positive pressure method gas flow standard device comprises an air compressor and a high-purity compressed gas tank, wherein the air compressor is connected with a gas purification device through a pipeline, the gas purification device is connected to one end of a gas storage tank through a pipeline, and the high-purity compressed gas tank is connected to the other end of the gas storage tank through a pipeline;
the output of gas holder has self-operated pressure regulator through the pipe connection, the output of self-operated pressure regulator has the surge tank through the pipe connection, the output of surge tank has the heat exchanger through the pipe connection, the output of heat exchanger has standard flowmeter through the pipe connection, the output of standard flowmeter has the constant temperature water bath case through the pipe connection, the output of constant temperature water bath case has the by-pass flowmeter through the pipe connection.
As a preferred technical scheme of the invention, the gas purification device comprises a water-cooling type cooler, a high-efficiency oil remover, a precision filter, a cold dryer and a suction dryer which are sequentially connected through a pipeline, and the gas purification device is used for enabling compressed air generated by an air compressor to reach a preset pressure dew point.
As a preferable technical scheme of the invention, a first valve is arranged in a pipeline connecting the gas purification device and the gas storage tank, and a second valve is arranged in a pipeline connecting the high-purity compressed gas tank and the gas storage tank.
In a preferred embodiment of the present invention, the standard flowmeter is replaceable.
In a preferred embodiment of the present invention, the standard flowmeter is a critical flow nozzle, a gas ultrasonic flowmeter, a gas roots flowmeter, or a gas turbine flowmeter.
As a preferable technical scheme of the invention, a pressure regulating valve is arranged at an inlet of the standard flowmeter, the pressure regulating range is 0.2 MPa-2.5 MPa, and the outlet pressure of the detected flowmeter is atmospheric pressure.
As a preferred technical solution of the present invention, the output end of the detected flowmeter is further connected to a vacuum pump through a pipeline, and the vacuum pump is used for increasing the pressure ratio and increasing the flow range of the detected flowmeter.
(III) advantageous effects
Compared with the prior art, the invention provides a variable medium positive pressure method gas flow standard device, which has the following beneficial effects:
1. this variable medium positive pressure method gas flow standard device produces different flow through the upper reaches pressure of adjusting standard flowmeter, and it is big to adjust the flow scope, causes the medium temperature change among the accommodation process of pressure to adopt heat exchanger and constant temperature water bath case to stabilize the temperature of medium, carries out coefficient compensation to standard flowmeter in the accommodation process of pressure, guarantees the accuracy of standard flowmeter flow quantity value.
2. According to the variable medium positive pressure method gas flow standard device, the standard flowmeter of the positive pressure method gas flow standard device works at positive pressure, the pressure is adjustable, the detected flowmeter works at normal pressure, the requirements of the detected flowmeter with different pressure grade requirements can be met, and the positive pressure method gas flow standard device is wide in application range;
meanwhile, the output end of the detected flowmeter is connected with a vacuum pump through a pipeline, the vacuum pump improves the pressure ratio, and the flow range of the detected flowmeter is enlarged.
3. According to the variable medium positive pressure method gas flow standard device, the working medium of the gas flow standard device can be replaced according to the actual working medium of the detected flowmeter, so that the detection working condition of the standard flowmeter is consistent with the actual working condition of the detected flowmeter, the flow inaccuracy caused by the inconsistency of the working medium is avoided, and the flow quantity value can be accurately reproduced.
4. According to the variable medium positive pressure method gas flow standard device, the pressure of the positive pressure method gas flow standard device adopts a self-operated pressure regulator, and the gas source pressure of the gas flow standard device is kept stable.
5. According to the variable medium positive pressure method gas flow standard device, for compressed air, a mode of combining a water-cooled cooler, a high-efficiency oil remover, a precision filter, a cold dryer and a suction dryer is adopted, parameters of each part of a purification system are reasonably selected, so that the compressed air reaches a pressure dew point of about-40 ℃, purified gas enters a gas storage tank to eliminate pulsation, a self-operated pressure regulator is adopted to regulate the inlet pressure of a standard device, and the regulated gas enters a pressure stabilizing tank; for other medium gases except air, high-purity compressed gas (free of impurities such as oil stain, moisture, dust and the like) can be directly fed into the gas storage tank.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
In the figure: 1. an air compressor; 2. a high purity compressed gas tank; 3. a gas purification device; 4. a gas storage tank; 5. a first valve; 6. a second valve; 7. a self-operated pressure regulator; 8. a surge tank; 9. a heat exchanger; 10. a standard flow meter; 11. a constant temperature water bath tank; 12. a detected flowmeter; 13. a vacuum pump.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1, a variable medium positive pressure method gas flow standard device comprises an air compressor 1 and a high purity compressed gas tank 2, wherein the air compressor 1 is connected with a gas purification device 3 through a pipeline, the gas purification device 3 is connected with one end of a gas storage tank 4 through a pipeline, and the high purity compressed gas tank 2 is connected with the other end of the gas storage tank 4 through a pipeline;
the output of gas holder 4 has self-operated pressure regulator 7 through the pipe connection, and the output of self-operated pressure regulator 7 has surge tank 8 through the pipe connection, and the output of surge tank 8 has heat exchanger 9 through the pipe connection, and the output of heat exchanger 9 has standard flowmeter 10 through the pipe connection, and the output of standard flowmeter 10 has constant temperature water bath box 11 through the pipe connection, and the output of constant temperature water bath box 11 has by flowmeter 12 through the pipe connection.
In the embodiment, the gas purification device 3 comprises a water-cooling type cooler, a high-efficiency oil remover, a precision filter, a cold dryer and a suction dryer which are sequentially connected through pipelines and used for enabling compressed air generated by the air compressor 1 to reach a preset pressure dew point, wherein the preset pressure dew point is-40 ℃;
a first valve 5 is arranged in a pipeline connecting the gas purifying device 3 and the gas storage tank 4, and a second valve 6 is arranged in a pipeline connecting the high-purity compressed gas tank 2 and the gas storage tank 4;
opening a first valve 5 and closing a second valve 6, treating compressed air generated by an air compressor 1 through a water-cooling type cooler, a high-efficiency oil remover, a precision filter, a cold dryer and a suction dryer to reach a pressure dew point of about-40 ℃, introducing the purified gas into a gas storage tank 4 to eliminate pulsation, adjusting the inlet pressure of a standard flowmeter 10 by adopting a self-operated pressure regulator 7, and introducing the adjusted gas into a pressure stabilizing tank 8;
for other medium gas than air, such as high-purity compressed gas (without impurities such as oil stain, moisture and dust), the high-purity compressed gas is stored in the high-purity compressed gas tank 2, the first valve 5 is closed, the second valve 6 is opened, and the high-purity compressed gas can directly enter the gas storage tank 4.
In this embodiment, the standard flow meter 10 is replaceable;
the standard flow meter 10 is a critical flow nozzle, a gas ultrasonic flow meter, a gas roots meter or a gas turbine flow meter;
a pressure regulating valve is arranged at the inlet of the standard flowmeter 10, the pressure regulating range is 0.2 MPa-2.5 MPa, and the outlet pressure of the detected flowmeter 12 is atmospheric pressure;
the working medium of the gas flow standard device can be replaced according to the actual working medium of the detected flowmeter 12, so that the detection working condition of the standard flowmeter 10 is consistent with the actual working condition of the detected flowmeter 12, the flow inaccuracy caused by inconsistent working medium is avoided, and the flow value can be accurately reproduced;
in this embodiment, one or more standard flowmeters 10 may be provided, in which the minimum flow rate of the large-sized standard flowmeter 10 and the minimum flow rate of the small-sized standard flowmeter 10 are provided with a coincidence point, so that the magnitude of the gas flow rate standard device can be self-verified.
In this embodiment, the output end of the flow meter 12 to be tested is further connected with a vacuum pump 13 through a pipeline, and the vacuum pump 13 is used for increasing the pressure ratio and increasing the flow range of the flow meter 12 to be tested.
In this embodiment, before the measurement by the flowmeter 12 to be tested, the method further includes the steps of: firstly, selecting a working medium air source (compressed air or other high-purity compressed gas) according to a detected flow meter 12; after the selection is finished, setting the detection flow by using the control equipment; selecting a corresponding standard flowmeter 10 according to the set flow; the inlet pressure of the standard flowmeter 10 is adjusted by a pressure regulating valve, and the flow rate is regulated to the set flow rate.
In the embodiment, different flow rates are generated by adjusting the upstream pressure of the standard flowmeter 10, the flow rate adjusting range is large, the temperature of the medium is stabilized by adopting the heat exchanger 9 and the constant-temperature water bath tank 11 due to the temperature change of the medium in the pressure adjusting process, and the flow rate value of the standard flowmeter 10 is ensured to be accurate by performing coefficient compensation on the standard flowmeter 10 in the pressure adjusting process.
In this embodiment, the working medium of the gas flow standard device can be replaced according to the actual working medium of the detected flowmeter 12, so that the detection working condition of the standard flowmeter 10 is consistent with the actual working condition of the detected flowmeter 12, thereby avoiding the inaccurate flow caused by the inconsistent working medium and accurately reproducing the flow value;
the pressure of the positive pressure method gas flow standard device adopts a self-operated pressure regulator 7, so that the gas source pressure of the gas flow standard device is kept stable.
In this embodiment, the heat exchanger 9 is used for heat exchange at the standard flowmeter 10, and the constant temperature water bath 11 is used for heat exchange at the detected flowmeter 12.
The working principle and the using process of the invention are as follows:
opening a first valve 5 and closing a second valve 6, treating compressed air generated by an air compressor 1 by a water-cooling type cooler, a high-efficiency oil remover, a precision filter, a cold dryer and a suction dryer to reach a pressure dew point of about-40 ℃, enabling the purified gas to enter a gas storage tank 4 to eliminate pulsation, adjusting the inlet pressure of a standard flowmeter 10 by adopting a self-operated pressure regulator 7, enabling the adjusted gas to enter a pressure stabilizing tank 8, synchronously acquiring signals of the standard flowmeter 10 and pulse or instantaneous flow of a detected flowmeter 12 after the pressure in the pressure stabilizing tank 8 is stabilized, then recording the temperatures, pressures and verification time of the standard flowmeter 10 and the detected flowmeter 12, stopping acquiring the signals synchronously when the time is up, calculating the standard flow according to the temperature pressure and the instrument coefficient of the standard flowmeter 10, and comparing the indication value of the detected flowmeter 12 with the indication value of the standard flowmeter 10, the indication error of the detected flowmeter 12 can be obtained;
other high-purity compressed gas (without impurities such as oil stain, moisture, dust and the like) which is not air is stored in the high-purity compressed gas tank 2, the first valve 5 is closed, the second valve 6 is opened, and the high-purity compressed gas can directly enter the gas storage tank 4;
before the measurement of the flow meter 12 to be tested, the method further comprises the following steps: firstly, selecting a working medium air source (compressed air or other high-purity compressed gas) according to a detected flow meter 12; after the selection is finished, setting the detection flow by using the control equipment; selecting a corresponding standard flowmeter 10 according to the set flow; the inlet pressure of the standard flowmeter 10 is adjusted by a pressure regulating valve, and the flow rate is regulated to the set flow rate.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A variable medium positive pressure method gas flow standard device comprises an air compressor (1) and a high-purity compressed gas tank (2), and is characterized in that: the air compressor (1) is connected with a gas purification device (3) through a pipeline, the gas purification device (3) is connected to one end of a gas storage tank (4) through a pipeline, and the high-purity compressed gas tank (2) is connected to the other end of the gas storage tank (4) through a pipeline;
the output of gas holder (4) has self-operated pressure regulator (7) through the pipe connection, the output of self-operated pressure regulator (7) has surge tank (8) through the pipe connection, the output of surge tank (8) has heat exchanger (9) through the pipe connection, the output of heat exchanger (9) has standard flowmeter (10) through the pipe connection, the output of standard flowmeter (10) has constant temperature water bath (11) through the pipe connection, the output of constant temperature water bath (11) has by-pass flowmeter (12) through the pipe connection.
2. The variable medium positive pressure method gas flow standard device according to claim 1, wherein: the gas purification device (3) comprises a water-cooling type cooler, a high-efficiency oil remover, a precision filter, a cold dryer and a suction dryer which are sequentially connected through pipelines and is used for enabling compressed air generated by the air compressor (1) to reach a preset pressure dew point.
3. The variable medium positive pressure method gas flow standard device according to claim 1, wherein: a first valve (5) is arranged in a pipeline connecting the gas purification device (3) and the gas storage tank (4), and a second valve (6) is arranged in a pipeline connecting the high-purity compressed gas tank (2) and the gas storage tank (4).
4. The variable medium positive pressure method gas flow standard device according to claim 1, wherein: the standard flow meter (10) is replaceable.
5. The variable medium positive pressure method gas flow rate standard device according to claim 4, wherein: the standard flow meter (10) is a critical flow nozzle, a gas ultrasonic flow meter, a gas roots meter or a gas turbine flow meter.
6. The variable medium positive pressure method gas flow rate standard device according to claim 5, wherein: and a pressure regulating valve is arranged at the inlet of the standard flowmeter (10), the pressure regulating range is 0.2 MPa-2.5 MPa, and the outlet pressure of the detected flowmeter (12) is atmospheric pressure.
7. The variable medium positive pressure method gas flow standard device according to claim 1, wherein: the output end of the detected flowmeter (12) is also connected with a vacuum pump (13) through a pipeline, and the vacuum pump (13) is used for improving the pressure ratio and enlarging the flow range of the detected flowmeter (12).
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| CN202110328175.5A CN112924001A (en) | 2021-03-26 | 2021-03-26 | Variable medium positive pressure method gas flow standard device |
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| CN202110328175.5A CN112924001A (en) | 2021-03-26 | 2021-03-26 | Variable medium positive pressure method gas flow standard device |
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| CN112924001A true CN112924001A (en) | 2021-06-08 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114993424A (en) * | 2022-05-20 | 2022-09-02 | 哈尔滨工业大学 | High-temperature high-pressure supercritical CO by standard meter method 2 Flowmeter balance state calibration device and method |
| CN117740121A (en) * | 2024-02-20 | 2024-03-22 | 成都睿宝电子科技有限公司 | Automatic calibration device and calibration method for flowmeter |
-
2021
- 2021-03-26 CN CN202110328175.5A patent/CN112924001A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114993424A (en) * | 2022-05-20 | 2022-09-02 | 哈尔滨工业大学 | High-temperature high-pressure supercritical CO by standard meter method 2 Flowmeter balance state calibration device and method |
| CN117740121A (en) * | 2024-02-20 | 2024-03-22 | 成都睿宝电子科技有限公司 | Automatic calibration device and calibration method for flowmeter |
| CN117740121B (en) * | 2024-02-20 | 2024-06-04 | 成都睿宝电子科技有限公司 | Automatic calibration device and calibration method for flowmeter |
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