CN111735520B - A gas flow standard device with high and low pressure dual calibration sections and calibration method thereof - Google Patents
A gas flow standard device with high and low pressure dual calibration sections and calibration method thereof Download PDFInfo
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- CN111735520B CN111735520B CN202010742995.4A CN202010742995A CN111735520B CN 111735520 B CN111735520 B CN 111735520B CN 202010742995 A CN202010742995 A CN 202010742995A CN 111735520 B CN111735520 B CN 111735520B
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- G—PHYSICS
- 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
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- G—PHYSICS
- 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
- G01F25/15—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters specially adapted for gas meters
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Abstract
一种具有高低压双校准段的气体流量标准装置及其校准方法，气体流量计量校准检定领域，本发明针对现有的流量计仅能在正压工况下校准、校准范围窄、成本较高的缺陷，提供一种具有高低压双校准段的流量标准装置及其校准方法。本发明中，高压气源的出口与高压截止阀、高压调节阀、可调节流阀、高压校准段、滞止容器、低压校准段、低压调节阀、低压截止阀和真空气源依次连通，高压被校流量计设置于高压校准段内；临界流音速喷嘴标准表和支路截止阀设置于滞止容器内，低压被校流量计设置于低压校准段内，通过调节高压被校流量计和低压被校流量计校准临界状态高压流量计、非临界状态高压流量计和低压流量计。本发明主要用于校准和检定气体流量。
A gas flow standard device with high and low pressure dual calibration sections and a calibration method thereof, in the field of gas flow measurement calibration and verification, the present invention aims at the defects that the existing flow meter can only be calibrated under positive pressure conditions, has a narrow calibration range and high cost, and provides a flow standard device with high and low pressure dual calibration sections and a calibration method thereof. In the present invention, the outlet of the high-pressure gas source is connected with the high-pressure stop valve, the high-pressure regulating valve, the adjustable flow valve, the high-pressure calibration section, the stagnation container, the low-pressure calibration section, the low-pressure regulating valve, the low-pressure stop valve and the vacuum gas source in sequence, and the high-pressure calibrated flow meter is arranged in the high-pressure calibration section; the critical flow sonic nozzle standard meter and the branch stop valve are arranged in the stagnation container, and the low-pressure calibrated flow meter is arranged in the low-pressure calibration section, and the critical state high-pressure flow meter, the non-critical state high-pressure flow meter and the low-pressure flow meter are calibrated by adjusting the high-pressure calibrated flow meter and the low-pressure calibrated flow meter. The present invention is mainly used for calibrating and verifying gas flow.
Description
Technical Field
The invention belongs to the field of gas flow metering calibration verification, and particularly relates to a flow standard device for a critical flow nozzle with high and low pressure double calibration sections and a calibration method thereof.
Background
Accurate measurement of gas flow has a wide range of requirements in the fields of petroleum, natural gas, chemical industry, energy conservation, environmental protection, aerospace and the like. Some flowmeters operate over a wide range of conditions, such as the same mass flow rate, and may operate at different stagnation pressures. The conventional negative pressure method or positive pressure method gas flow calibration device cannot fully meet the calibration requirements of some flowmeters in the aspects of flow capacity calibration range, calibration precision, calibration working condition range and the like. The utility model patent with publication number CN104501917A discloses a calibrating device for a gas flowmeter with an ultra-large caliber sonic nozzle group, which adopts the principle of a negative pressure sonic nozzle, but is calibrated at the upstream of a standard meter, and the pressure working condition of the calibration is only atmospheric pressure. The utility model patent with publication number CN 103791951A discloses a positive pressure standard gas flowmeter and a positive pressure standard gas flow measuring method, and the calibrated meter can be positioned on one side of the standard meter. Both of the above types of sonic nozzle flow calibration devices are greatly limited in terms of flow range and calibrated pressure operating range and fail to fully utilize the capability of the sonic nozzle calibration meter. The utility model patent with publication number CN 108444576A discloses a parallel structure of a double-gas flow standard device, the utility model adopts two flow standard devices with different principle types to be combined for use, the flow range is enlarged, the technical and cost requirements of the scheme are higher, the realizable calibration working condition is limited, and the requirement of some live calibration cannot be met.
Therefore, there is a need for a flow standard device and method for calibrating a high and low pressure dual calibration segment that can improve calibration capability and achieve specific calibration requirements.
Disclosure of Invention
Aiming at the defects that the existing flowmeter can be calibrated only under the positive pressure working condition, the calibration range is narrow and the cost is high, the invention provides the flow standard device with high and low pressure double calibration sections and the calibration method thereof, which can improve the calibration capability, enlarge the calibration range and realize special calibration requirements with low cost.
The invention relates to a gas flow standard device with high-low pressure double calibration sections and a calibration method thereof, which comprises the following technical scheme:
The invention relates to a gas flow standard device with high-low pressure double calibration sections, which comprises a high-pressure gas source, a high-pressure stop valve, a high-pressure regulating valve, an adjustable throttle valve, a high-pressure calibrated flowmeter, a high-pressure calibration section, a stagnation container, a critical flow sonic nozzle standard meter, a branch stop valve, a low-pressure calibrated flowmeter, a low-pressure calibration section, a low-pressure regulating valve, a low-pressure exhaust valve, a low-pressure stop valve and a vacuum gas source, wherein the outlet of the high-pressure gas source is sequentially communicated with the high-pressure stop valve, the high-pressure regulating valve, the adjustable throttle valve, the high-pressure calibration section, the stagnation container, the low-pressure calibration section, the low-pressure regulating valve, the low-pressure stop valve and the vacuum gas source,
The high-pressure calibrated flowmeter is arranged in the high-pressure calibration section, or the high-pressure calibrated flowmeter is positioned at the downstream of the adjustable throttle valve and at the upstream of the stagnation container;
The critical flow sonic nozzle standard meter and the branch stop valve are arranged in the stagnation container, an inlet of the critical flow sonic nozzle standard meter is communicated with the upstream of the stagnation container, an outlet of the critical flow sonic nozzle standard meter is communicated with an inlet of the branch stop valve, an outlet of the branch stop valve is communicated with an inlet of the low-pressure calibration section, the low-pressure calibrated meter is arranged in the low-pressure calibration section, the low-pressure calibrated meter is positioned at the upstream of the low-pressure regulating valve and at the downstream of the branch stop valve, and an inlet of the low-pressure exhaust valve is connected between the low-pressure regulating valve and the low-pressure stop valve.
The critical flow sonic nozzle standard table comprises five paths, wherein the five paths are specifically a first nozzle path, a second nozzle path, a fourth nozzle path, a first eighth nozzle path and a second eighth nozzle path, the number of the branch stop valves is five, and the five branch stop valves are respectively communicated with the downstream of the five paths.
Further, the high pressure calibrated flow meter is located upstream of the adjustable throttle valve and downstream of the high pressure regulator valve.
A method of calibrating a gas flow standard device having a high and low pressure dual calibration section, comprising the steps of:
step one, calibrating a critical state high-pressure flowmeter by utilizing the high-pressure calibrated flowmeter;
step two, calibrating the high-pressure flowmeter in a non-critical state by utilizing the high-pressure calibrated flowmeter;
And thirdly, calibrating the low-pressure flowmeter by using the low-pressure calibrated flowmeter.
Further, in step one, it comprises the steps of:
the high-pressure calibrated flowmeter is positioned at the downstream of the adjustable throttle valve and the upstream of the stagnation container, and the low-pressure calibration section at the downstream of the stagnation container is connected by adopting equal straight pipes;
Step one, a high-pressure stop valve is opened, and a high-pressure regulating valve is regulated, so that stable high pressure is kept in front of an adjustable throttle valve;
step one, an adjustable throttle valve is adjusted to enable the pressure before the high-pressure calibrated flowmeter to reach the pressure of a calibration working condition;
Step four, partially or completely opening a downstream branch stop valve to enable the mass flow rate of the critical flow sonic nozzle standard table to be equal to the calibrated mass flow rate;
And fifthly, regulating the downstream low-pressure regulating valve and the low-pressure exhaust valve to be fully opened so as to enable the air flow to flow out, and at the moment, calibrating or verifying the critical high-pressure calibrated flowmeter by adopting the mass flow reserved in the critical flow sonic nozzle standard meter.
Further, in the second step, it comprises the following steps:
Step two, the high-pressure calibrated flowmeter is positioned at the upstream of the adjustable throttle valve and the downstream of the high-pressure adjusting valve, and the low-pressure calibration section at the downstream of the stagnation container is connected by adopting equal straight pipes;
Step two, a high-pressure stop valve is opened, and a high-pressure regulating valve is regulated, so that the pressure of the high-pressure calibrated flowmeter reaches the working condition of calibrating the pressure;
Step two, adjusting the adjustable throttle valve to change the mass flow flowing in the pipeline so as to meet the flow calibration working condition;
step two, partially or completely opening a downstream branch stop valve, wherein after the pressure in the stagnation container is stable, the mass flow flowing out of the critical flow sonic nozzle standard meter is the calibrated mass flow;
And fifthly, regulating the downstream low-pressure regulating valve and the low-pressure exhaust valve to be fully opened so as to enable the air flow to flow out, and at the moment, calibrating or verifying the critical high-pressure calibrated flowmeter by adopting the mass flow reserved in the critical flow sonic nozzle standard meter.
Further, in the third step, it comprises the following steps:
step three, the low-pressure calibrated flowmeter is arranged at a low-pressure calibration section, the low-pressure calibrated flowmeter is positioned at the upstream of a low-pressure regulating valve and the downstream of a branch stop valve, and the upstream high-pressure calibration section is connected by adopting equal straight pipes;
Step three, opening a high-pressure stop valve, and adjusting a high-pressure regulating valve and an adjustable throttle valve to change the mass flow in a pipeline so as to meet the flow calibration working condition;
Step three, partially or completely opening a downstream branch stop valve, and obtaining the mass flow rate of the critical flow sonic nozzle standard meter after the pressure in the stagnation container is stable;
Step three, regulating the downstream low-pressure regulating valve and the low-pressure stop valve to be fully opened, so that the air flow flows into a vacuum air source;
And step three, when the low-pressure calibrated flowmeter under the non-critical positive and negative pressure working conditions is calibrated, the low-pressure regulating valve at the downstream is required to be regulated to enable the pressure before the low-pressure calibrated flowmeter to reach the calibrated pressure working condition, a vacuum air source is required to be started at the moment, and the critical low-pressure calibrated flowmeter is calibrated or verified by adopting the mass flow flowing out of the critical flow sonic nozzle standard meter.
The gas flow standard device with the high-low pressure double calibration sections and the calibration method thereof have the beneficial effects that:
The invention relates to a gas flow standard device with high-low pressure double calibration sections and a calibration method thereof, which designs a reasonably designed pipeline valve configuration mode, adopts a critical flow venturi nozzle as a standard meter of the flow standard device in the device, utilizes the characteristic of upstream and downstream pressure difference of a sonic nozzle to respectively set the high-pressure calibration section and the low-pressure calibration section, fully utilizes the advantages of the flow standard device of the prior positive pressure method and the negative pressure method, greatly expands the working condition range of flow calibration and improves the calibration precision. The device can calibrate the flowmeter in a wider pressure and flow working condition range. First, the cost of a standard flow device is reduced with the same calibration capability. If the high-low pressure calibration section is placed on the same side of the upstream or downstream of the sonic nozzle, more and larger sonic nozzles are needed to meet the flow calibration requirements, reducing the requirements on a sonic nozzle standard table and reducing the construction cost. And the set high-pressure calibration section can expand the calibration range by changing the pressure, and the low-pressure calibration section is arranged at the downstream of the same group of sonic nozzle standard meters, so that the calibrated pressure working condition range is further expanded. Furthermore, the actual working condition of the flowmeter can be simulated for calibration, and the calibration accuracy of the flowmeter is improved.
Drawings
FIG. 1 is a schematic view of the overall apparatus of the present invention;
FIG. 2 is a structural device diagram of a critical flow sonic nozzle standard table;
FIG. 3 is a schematic diagram of an embodiment of a critical state high pressure flow meter calibration;
FIG. 4 is a schematic diagram of an embodiment of a calibration of a non-critical state high pressure flow meter;
FIG. 5 is a schematic diagram of an embodiment of a low pressure flow meter calibration;
FIG. 6 is a state diagram of performing critical state high pressure flow meter calibration;
in the figure, 1 is a high-pressure air source, 2 is a high-pressure stop valve, 3 is a high-pressure regulating valve, 4 is an adjustable throttle valve, 5 is a high-pressure calibrated flowmeter, 6 is a high-pressure calibration section, 7 is a stagnation container, 8 is a critical flow sonic nozzle standard table, 9 is a branch stop valve, 10 is a low-pressure calibrated flowmeter, 11 is a low-pressure calibration section, 12 is a low-pressure regulating valve, 13 is a low-pressure exhaust valve, 14 is a low-pressure stop valve, 15 is a vacuum air source, 81 is a nozzle passage, 82 is a two-nozzle passage, 83 is a four-nozzle passage, 84 is a first eight-nozzle passage, and 85 is a second eight-nozzle passage.
Detailed Description
The following embodiments are used for further illustrating the technical scheme of the present invention, but not limited thereto, and all modifications and equivalents of the technical scheme of the present invention are included in the scope of the present invention without departing from the spirit and scope of the technical scheme of the present invention.
Example 1
In the embodiment, a gas flow standard device with a high-pressure calibration section and a low-pressure calibration section related to the embodiment is described by combining with figures 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 and 15, wherein an outlet of the high-pressure gas source 1 is sequentially communicated with the high-pressure stop valve 2, the high-pressure stop valve 3, the adjustable throttle valve 4, the high-pressure calibration section 6, the low-pressure calibration section 11, 12, the low-pressure stop valve 14 and 15, the high-pressure calibrated section 5 is arranged in the high-pressure calibration section 6, 8 and 9, an outlet of the high-pressure gas source 1 is communicated with the high-pressure stop valve 2, the high-pressure stop valve 3, the adjustable throttle valve 4, the high-pressure calibration section 6, the low-pressure stop valve 14 and 15, the high-pressure calibrated section 8 and the low-pressure calibrated section 7 are arranged in the high-pressure calibration section 6, the critical flow rate nozzle gauge 8 and 9 are arranged in the high-pressure calibrated section 8, the critical flow rate nozzle gauge 9 is arranged in the low-pressure calibrated section 8 and the low-pressure stop valve 10, the high-pressure calibrated section is communicated with the low-pressure stop valve 10, and the low-pressure stop valve 10 is communicated with the low-pressure stop valve 10, and the high-pressure stop valve 10 is communicated with the high-pressure gauge 10, and the low-pressure gauge 10 is communicated with the low-pressure gauge 10. The calibration requirements of high-pressure working conditions and low-pressure working conditions can be met by utilizing a set of critical flow sonic nozzles. For the same flow point, the flowmeter can be calibrated under the high-pressure working condition and the low-pressure working condition respectively, so that live calibration is realized, the cost of the device is reduced, and the calibration capability is enlarged. When the low-pressure flowmeter is calibrated, the calibrated low-pressure flowmeter 10 is arranged in the low-pressure calibration section 11, and is positioned at the upstream of the low-pressure regulating valve 12 and at the downstream of the branch stop valve 9, and the upstream high-pressure calibration section 6 is connected by adopting equal straight pipes. The high-pressure stop valve 2 is opened, the mass flow in the pipeline is changed by the high-pressure regulating valve 3 and the adjustable throttle valve 4 to meet the flow calibration working condition, the downstream branch stop valve 9 is partially or completely opened, after the pressure in the stagnation container 7 is stable, the mass flow flowing out of the critical flow Venturi nozzle standard meter 8 is the calibrated mass flow, and when the critical low-pressure flow is calibrated, the downstream low-pressure regulating valve 12 and the low-pressure stop valve 14 are fully opened to enable the air flow to flow into the vacuum air source 15. When calibrating the non-critical low pressure flow meter 10, the downstream low pressure regulator valve 12 needs to be adjusted to bring the pressure before the meter being calibrated to the calibrated pressure condition. The critical class high pressure flow meter 10 is calibrated or calibrated using the mass flow set forth in the critical flow venturi nozzle standard table 8.
More specifically, the critical flow sonic nozzle standard table 8 includes five passages, specifically a first nozzle passage 81, a second nozzle passage 82, a fourth nozzle passage 83, and a first and second eight nozzle passages 84, 85, the branch shut-off valves 9 being five, and the five branch shut-off valves 9 being respectively in downstream communication with the five passages. The critical flow sonic nozzle standard table comprises 23 Venturi sonic nozzles with the same throat diameter, and is divided into 5 passages, wherein the first passage comprises 1 sonic nozzle, the second passage comprises 2 sonic nozzles, the third passage comprises 4 sonic nozzles, the fourth passage comprises 8 sonic nozzles, and the fifth passage comprises 8 sonic nozzles. And a branch stop valve 9 is arranged at the downstream of each passage and can control the on-off of a critical flow Venturi nozzle standard table. The combination of the passages can realize the continuous opening of the number of 1-23 nozzles, for example, the opening of 13 nozzles can be realized by opening 1,4 and 8 nozzles of the first, third and fourth passages, so that the adjustment of the flow rate of the standard meter of the sonic nozzle can be realized by opening different numbers of nozzles. In addition, by adjusting the adjustable throttle valve, the stagnation pressure in front of the nozzle can be changed, further changing the mass flow through the sonic nozzle gage. Therefore, the magnitude of the gas flow through the critical flow venturi nozzle standard table can be changed not only by how much the bypass shutoff valve is opened, but also by adjusting the stagnation pressure in the stagnation vessel by the upstream adjustable throttle valve.
More specifically, the high pressure calibrated flow meter 5 is located downstream of the adjustable throttle valve 4 and upstream of the stagnation vessel 7. When the critical state high pressure flowmeter is calibrated, the calibrated high pressure flowmeter 5 is arranged in the high pressure calibrating section 6, and is positioned at the downstream of the adjustable throttle valve 4 and at the upstream of the stagnation container 7, and the downstream low pressure calibrating section 11 is connected by adopting equal straight pipes. The high-pressure stop valve 2 is opened, the high-pressure regulating valve 3 is regulated to keep stable high pressure in front of the adjustable throttle valve 4, the adjustable throttle valve 4 is regulated to enable the pressure in front of the high-pressure flowmeter 5 to reach the pressure of a calibration working condition, the downstream branch stop valve 9 is partially or completely opened to enable the mass flow rate of the critical flow Venturi nozzle standard meter 8 to be equal to the mass flow rate to be calibrated, and the downstream low-pressure regulating valve 12 and the low-pressure exhaust valve 13 are fully opened to enable the air flow to flow out. At this point, the critical class high pressure flow meter 5 is calibrated or calibrated using the mass flow set forth in the critical flow venturi nozzle standard table 8.
More specifically, the high-pressure calibrated flow meter 5 is located upstream of the adjustable throttle valve 4 and downstream of the high-pressure regulating valve 3. When the high-pressure flowmeter in the non-critical state is calibrated, the high-pressure flowmeter 5 to be calibrated is arranged in the high-pressure calibration section 6, and is positioned at the upstream of the adjustable throttle valve 4 and at the downstream of the high-pressure adjusting valve 3, and the downstream low-pressure calibration section 11 is connected by adopting equal straight pipes. The high-pressure stop valve 2 is opened, the high-pressure regulating valve 3 is regulated to enable the pressure in front of the calibrated high-pressure flowmeter 5 to reach the working condition of the calibrated pressure, the adjustable throttle valve 4 is regulated to change the mass flow flowing in a pipeline to meet the flow calibration working condition, the downstream branch stop valve 9 is partially or completely opened, after the pressure in the stagnation container 7 is stable, the mass flow flowing out of the critical flow venturi nozzle standard meter 8 is the calibrated mass flow, and the downstream low-pressure regulating valve 12 and the low-pressure exhaust valve 13 are fully opened to enable the airflow to flow out. At this point, the critical class high pressure flow meter 5 is calibrated or calibrated using the mass flow set forth in the critical flow venturi nozzle standard table 8.
Example 2
The present embodiment will be described with reference to embodiment 1, in which a method for calibrating a gas flow standard device having a high-low pressure dual calibration section according to the present embodiment includes the steps of:
Step one, calibrating a critical state high-pressure flowmeter by utilizing the high-pressure calibrated flowmeter 5;
step two, calibrating the high-pressure flowmeter in a non-critical state by utilizing the high-pressure calibrated flowmeter 5;
And step three, calibrating the low-pressure flowmeter by using the low-pressure calibrated flowmeter 10.
A gas flow standard device with high-low pressure double calibration sections and a calibration method thereof can be used for calibrating and certifying a high-pressure working condition flowmeter and a low-pressure working condition flowmeter, and the total mass flow flowing through the standard meter can be calculated by the following formula:
Wherein q m is mass flow, C dn is sonic nozzle outflow coefficient (n=1 to 23), D is sonic nozzle throat nominal diameter, C * is critical quantity function, P 0 is stagnation temperature, T 0 is stagnation temperature, R is general gas constant, 8.31441J/(mol.K), M is gas molar mass, kg/mol.
And a high-pressure calibration section is arranged at the upstream of the critical flow Venturi nozzle standard meter and is used for installing flow meters working under high-pressure conditions with different sizes, and the gas flowing through the high-pressure calibrated flow meter can be metered and calibrated through the downstream critical flow sonic nozzle standard meter. The size of the high-pressure calibration section calibrated flowmeter is relatively small, the maximum pressure can reach 3-5 MPa, and the maximum diameter can reach 200mm.
And a high-pressure calibration section is arranged at the downstream of the critical flow Venturi nozzle standard meter and is used for installing flow meters working under low-pressure conditions with different sizes, and the gas flowing through the low-pressure calibrated flow meter can be metered and calibrated through the upstream critical flow sonic nozzle standard meter. The maximum working pressure of the calibrated flowmeter in the low-pressure calibration section can reach 1MPa, the minimum working pressure can be 0.05MPa, and the maximum diameter can reach 400mm. According to the technical scheme, the flowmeter calibration with wide pressure range and wide size range can be realized by fully utilizing one set of sonic nozzle standard table.
More specifically, when the critical state high pressure flowmeter calibration is performed, the high pressure calibrated flowmeter 5 is installed in the high pressure calibration section 6, which is positioned at the downstream of the adjustable throttle valve 4 and at the upstream of the stagnation container 7, and the downstream low pressure calibration section 11 is connected by adopting equal straight pipes. At this time, the adjustable throttle valve 4 and the critical flow venturi nozzle gauge 8 downstream of the stagnation vessel 7 are in a critical state, and the pressure P01 upstream of the throttle valve 4 is required to be sufficiently high in order to make the high-pressure calibrated meter 5 critical according to the principle of conservation of flow in the pipeline. At this time, the following formula is satisfied, and thus, in the case where P01 is sufficiently high, A1 and A3 are adjusted, but the critical point is reached at A2.
The high-pressure stop valve 2 is opened, the high-pressure regulating valve 3 is regulated to keep stable high pressure P01 in front of the adjustable throttle valve 4, the adjustable throttle valve 4 is regulated to enable the pressure in front of the high-pressure calibrated flowmeter 5 to reach the calibration working condition pressure P02, the downstream branch stop valve 9 is partially or completely opened to change the flow area A3, the pressure P03 in the stagnation container 7 can also be regulated to enable the mass flow rate of the critical flow Venturi nozzle standard meter 8 to be equal to the calibrated mass flow rate, and the downstream low-pressure regulating valve 12 and the low-pressure exhaust valve 13 are fully opened to enable the air flow to flow out. At this point, the critical class high pressure flow meter 5 is calibrated or calibrated using the mass flow set forth in the critical flow venturi nozzle standard table 8.
More specifically, when the high-pressure flowmeter is calibrated in a non-critical state, the high-pressure flowmeter 5 to be calibrated is arranged in the high-pressure calibration section 6, and is positioned at the upstream of the adjustable throttle valve 4 and at the downstream of the high-pressure adjusting valve 3, and the downstream low-pressure calibration section 11 is connected by adopting equal straight pipes. The high-pressure stop valve 2 is opened, the high-pressure regulating valve 3 is regulated to enable the pressure in front of the calibrated high-pressure flowmeter 5 to reach the working condition of the calibrated pressure, the adjustable throttle valve 4 is regulated to change the mass flow flowing in a pipeline to meet the flow calibration working condition, the downstream branch stop valve 9 is partially or completely opened, after the pressure in the stagnation container 7 is stable, the mass flow flowing out of the critical flow venturi nozzle standard meter 8 is the calibrated mass flow, and the downstream low-pressure regulating valve 12 and the low-pressure exhaust valve 13 are fully opened to enable the airflow to flow out. At this point, the critical class high pressure flow meter 5 is calibrated or calibrated using the mass flow set forth in the critical flow venturi nozzle standard table 8.
More specifically, when the low-pressure flowmeter is calibrated, the calibrated low-pressure flowmeter 10 is arranged in the low-pressure calibrating section 11, and is positioned at the upstream of the low-pressure regulating valve 12 and at the downstream of the branch stop valve 9, and the upstream high-pressure calibrating section 6 is connected by adopting equal straight pipes. The high-pressure stop valve 2 is opened, the mass flow in the pipeline is changed by the high-pressure regulating valve 3 and the adjustable throttle valve 4 to meet the flow calibration working condition, the downstream branch stop valve 9 is partially or completely opened, after the pressure in the stagnation container 7 is stable, the mass flow flowing out of the critical flow Venturi nozzle standard meter 8 is the calibrated mass flow, and when the critical low-pressure flow is calibrated, the downstream low-pressure regulating valve 12 and the low-pressure stop valve 14 are fully opened to enable the air flow to flow into the vacuum air source 15. When calibrating the low pressure flowmeter 10 under non-critical positive and negative pressure conditions, the downstream low pressure regulator 12 needs to be adjusted to bring the pressure before the calibrated flowmeter to the calibrated pressure condition, and at this time, the vacuum air source 15 needs to be turned on. The critical class low pressure flow meter 10 is calibrated or calibrated using the mass flow exiting in the critical flow venturi nozzle standard table 8.
Example 3
This embodiment will be described in conjunction with embodiment 1 and embodiment 2,
1) When the calibration of the high-pressure flow meter in the critical state is performed, the high-pressure calibrated flow meter 5 is located between the adjustable throttle valve 4 and the stagnation vessel 7, the actual state is similar to fig. 6, the calibrated flow meter is located at the section A2, the adjustable throttle valve 4 is located at the section A1, and the stagnation vessel 7 is the space in front of the section A3. At this time, P01> P02> P03, A1< A2< A3, A2/A1> k1, P01/P03> k2, k1 and k2 are all values larger than 1, and the pipeline state set according to the area can enable the calibrated flowmeter at the section 2 to reach the critical state, namely the throat to reach the sound velocity, as long as P01 is high enough. I.e., to provide the ability to calibrate critical flow meters.
2) When the non-critical state high pressure flow meter calibration is performed, the high pressure calibrated flow meter 5 is located intermediate the high pressure regulator valve 3 and the adjustable throttle valve 4, and the actual state is similar to fig. 6, the calibrated flow meter is located at the section A2, and the adjustable throttle valve 4 is located at the section A1. In this case, A1> A2, A2< A3, and P02≡P01> P03, and the flow area at the section A2 is larger due to the throttling at the section A1, and the section A2 is only in a non-critical state. At this point, the ability to calibrate the critical flow meter may be provided prior to section A1.
The number of flows of the adjustable throttle valve 4 and the critical flow venturi nozzle standard table 8 (at section 3) are both adjustable, in effect changing the area to match the pressure, further achieving critical or non-critical conditions.
Claims (7)
1. The gas flow standard device with high-low pressure double calibration sections is characterized by comprising a high-pressure gas source (1), a high-pressure stop valve (2), a high-pressure regulating valve (3), an adjustable throttle valve (4), a high-pressure calibrated flowmeter (5), a high-pressure calibration section (6), a stagnation container (7), a critical flow sonic nozzle standard meter (8), a branch stop valve (9), a low-pressure calibrated flowmeter (10), a low-pressure calibration section (11), a low-pressure regulating valve (12), a low-pressure exhaust valve (13), a low-pressure stop valve (14) and a vacuum gas source (15), wherein the outlet of the high-pressure gas source (1) is sequentially communicated with the high-pressure stop valve (2), the high-pressure regulating valve (3), the adjustable throttle valve (4), the high-pressure calibration section (6), the stagnation container (7), the low-pressure calibration section (11), the low-pressure regulating valve (12), the low-pressure stop valve (14) and the vacuum gas source (15),
The high-pressure calibrated flowmeter (5) is arranged in the high-pressure calibration section (6), or the high-pressure calibrated flowmeter (5) is positioned at the downstream of the adjustable throttle valve (4) and at the upstream of the stagnation container (7);
The low-pressure calibrated flow meter (10) is arranged in the low-pressure calibration section (11), the low-pressure calibrated flow meter (10) is positioned on the upstream of the low-pressure regulating valve (12) and the downstream of the low-pressure stop valve (9), and the inlet of the low-pressure exhaust valve (13) is connected between the low-pressure regulating valve (12) and the low-pressure stop valve (14).
2. A gas flow standard device with high and low pressure dual calibration section according to claim 1, characterized in that the critical flow sonic nozzle standard meter (8) comprises five passages, in particular a nozzle passage (81), two nozzle passages (82), four nozzle passages (83) and a eight nozzle passage (84) and a eight nozzle passage (85), the branch shut-off valves (9) being five and the five branch shut-off valves (9) being in communication downstream of the five passages, respectively.
3. A gas flow standard device with dual high and low pressure calibration section according to claim 2, characterized in that the high pressure calibrated meter (5) is located upstream of the adjustable throttle valve (4) and downstream of the high pressure regulating valve (3).
4. A method of calibrating a gas flow standard device having a dual high and low pressure calibration section according to claim 1, comprising the steps of:
step one, calibrating a critical state high-pressure flowmeter by utilizing the high-pressure calibrated flowmeter (5);
step two, calibrating the high-pressure flowmeter (5) in a non-critical state by utilizing the high-pressure calibrated flowmeter;
and thirdly, calibrating the low-pressure flowmeter by using the low-pressure calibrated flowmeter (10).
5. The method of calibrating a gas flow calibration device having a dual high and low pressure calibration section according to claim 4, comprising the steps of, in step one:
The high-pressure calibrated flowmeter (5) is positioned at the downstream of the adjustable throttle valve (4) and at the upstream of the stagnation container (7), and the low-pressure calibration section (11) at the downstream of the stagnation container (7) is connected by adopting equal straight pipes;
Step two, a high-pressure stop valve (2) is opened, and a high-pressure regulating valve (3) is regulated, so that stable high pressure is kept in front of an adjustable throttle valve (4);
step one, an adjustable throttle valve (4) is adjusted to enable the pressure before the high-pressure calibrated flowmeter (5) to reach the pressure of a calibration working condition;
Step four, partially or completely opening a downstream branch stop valve (9) to enable the mass flow rate of the critical flow sonic nozzle standard table (8) to be equal to the calibrated mass flow rate;
and fifthly, regulating the downstream low-pressure regulating valve (12) and the low-pressure exhaust valve (13) to be fully opened so as to enable the air flow to flow out, and at the moment, calibrating or verifying the critical high-pressure calibrated flowmeter (5) by adopting the mass flow flowing out of the critical flow sonic nozzle standard meter (8).
6. The method of calibrating a gas flow calibration device having a dual high and low pressure calibration section according to claim 4, comprising the steps of, in step two:
Step two, the high-pressure calibrated flowmeter (5) is positioned at the upstream of the adjustable throttle valve (4) and at the downstream of the high-pressure adjusting valve (3), and the low-pressure calibration section (11) at the downstream of the stagnation container (7) is connected by adopting equal straight pipes;
step two, a high-pressure stop valve (2) is opened, and a high-pressure regulating valve (3) is regulated, so that the pressure of the high-pressure calibrated flowmeter (5) reaches the working condition of calibrating pressure;
Step two, adjusting the adjustable throttle valve (4) to change the mass flow flowing in the pipeline so as to meet the flow calibration working condition;
Step two, a downstream branch stop valve (9) is partially or completely opened, and after the pressure in the stagnation container (7) is stable, the mass flow flowing out of the critical flow sonic nozzle standard meter (8) is the calibrated mass flow;
And step two, regulating the downstream low-pressure regulating valve (12) and the low-pressure exhaust valve (13) to be fully opened so as to enable the air flow to flow out, and at the moment, calibrating or verifying the non-critical high-pressure calibrated flowmeter (5) by adopting the mass flow flowing out of the critical flow sonic nozzle standard meter (8).
7. A method of calibrating a gas flow standard device having a dual high and low pressure calibration section according to claim 4, comprising, in step three, the steps of:
Step three, the low-pressure calibrated flowmeter (10) is arranged in a low-pressure calibration section (11), the low-pressure calibrated flowmeter (10) is positioned at the upstream of a low-pressure regulating valve (12) and at the downstream of a branch stop valve (9), and an upstream high-pressure calibration section (6) is connected by adopting equal straight pipes;
step three, opening a high-pressure stop valve (2), and adjusting a high-pressure adjusting valve (3) and an adjustable throttle valve (4) to change the mass flow in a pipeline so as to meet the flow calibration working condition;
thirdly, partially or completely opening a downstream branch stop valve (9), and obtaining the mass flow rate of the critical flow sonic nozzle standard meter (8) after the pressure in the stagnation container (7) is stable;
Step three, the downstream low-pressure regulating valve (12) and the low-pressure stop valve (14) are fully opened, so that air flows into the vacuum air source (15);
And step three, when the low-pressure calibrated flowmeter (10) under the non-critical positive and negative pressure working condition is calibrated, the downstream low-pressure regulating valve (12) is required to be regulated to enable the pressure before the low-pressure calibrated flowmeter (10) to reach the calibrated pressure working condition, a vacuum air source (15) is required to be started at the moment, and the non-critical low-pressure calibrated flowmeter (10) is calibrated or verified by adopting the mass flow flowing out of the critical flow sonic nozzle standard meter (8).
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| CN112924001A (en) * | 2021-03-26 | 2021-06-08 | 上海市计量测试技术研究院 | Variable medium positive pressure method gas flow standard device |
| CN113375891B (en) * | 2021-07-09 | 2022-05-17 | 中国空气动力研究与发展中心低速空气动力研究所 | Air inlet simulation system, air inlet simulation method and empty model pressure loss simulation method |
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