CN212254275U - Gas flow standard device with high-low pressure double calibration sections - Google Patents
Gas flow standard device with high-low pressure double calibration sections Download PDFInfo
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- CN212254275U CN212254275U CN202021531029.XU CN202021531029U CN212254275U CN 212254275 U CN212254275 U CN 212254275U CN 202021531029 U CN202021531029 U CN 202021531029U CN 212254275 U CN212254275 U CN 212254275U
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Abstract
The utility model provides a gas flow standard device with two calibration sections of high-low pressure, gas flow measurement calibration examination field, the utility model discloses to current flowmeter only can be under the malleation operating mode calibration, calibration range is narrow, the higher defect of cost, provide a flow standard device with two calibration sections of high-low pressure. In the utility model, the outlet of the high pressure air source is 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 air source in turn, and the high pressure is arranged in the high pressure calibration section by the calibration flowmeter; the critical flow sonic nozzle standard meter and the branch stop valve are arranged in the stagnation container, the low-pressure calibrated flowmeter is arranged in the low-pressure calibration section, and the critical state high-pressure flowmeter, the non-critical state high-pressure flowmeter and the low-pressure flowmeter are calibrated by adjusting the high-pressure calibrated flowmeter and the low-pressure calibrated flowmeter. The utility model discloses mainly used calibration and examination gas flow.
Description
Technical Field
The utility model belongs to gas flow measurement calibration examination field, concretely relates to gas flow standard device with two calibration sections of high-low pressure.
Background
The accurate measurement of the gas flow has wide requirements in the fields of petroleum, natural gas, chemical industry, energy conservation, environmental protection, aerospace and the like. Some meters may operate at different stagnation pressures over a wide range of operating conditions, such as the same mass flow rate. The conventional gas flow calibration device adopting the negative pressure method or the positive pressure method cannot fully meet the calibration requirements of some flowmeters in the aspects of the calibration flow capacity range, the calibration precision, the calibration working condition range and the like. The utility model discloses a utility model patent that publication number is CN104501917A discloses super large-bore sonic nozzle group formula gas flowmeter calibrating installation, and the device has adopted negative pressure method sonic nozzle principle, but its upper reaches that is located the standard table by the school table, and the pressure operating mode of calibration only is atmospheric pressure. The utility model with publication number CN103791951A discloses a positive pressure standard gas flowmeter and a positive pressure standard gas flow measuring method, and the calibrated meter can only be located on one side of the standard meter. Both of the above two types of sonic nozzle flow calibration devices are greatly limited in flow range and calibrated pressure regime range and fail to fully utilize the capabilities of the sonic nozzle calibration tables. The utility model discloses a utility model with publication number CN108444576A discloses a two gas flow standard device parallel structure, and this utility model has adopted the flow standard device of two kinds of different principle types to make up the use and has increased the flow scope, and this scheme is higher to technical and cost requirement, and realizable calibration operating mode is limited, can not satisfy some live demand of calibrating equally.
Therefore, there is a need for a high and low pressure dual calibration segment flow calibration device that can improve calibration capability and achieve specific calibration requirements.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to current flowmeter only can be at the malleation under the operating mode defect that calibration, calibration range are narrow, the cost is higher, provide one kind can improve the calibration ability, enlarge calibration range, low cost, can realize the flow standard device of the two calibration sections of high-low pressure of special calibration demand.
The utility model relates to a gas flow standard device with two calibration sections of high-low pressure's technical scheme as follows:
the utility model relates to a gas flow standard device with high-low pressure double calibration section, it includes high-pressure air supply, high-pressure stop valve, high pressure governing valve, adjustable throttle valve, high pressure by school flowmeter, high pressure calibration section, stagnant container, critical flow velocity of sound nozzle standard table, branch road stop valve, low pressure by school flowmeter, low pressure calibration section, low pressure governing valve, low pressure discharge valve, low pressure stop valve and vacuum air supply, the export of high-pressure air supply communicates with high-pressure stop valve, high pressure governing valve, adjustable throttle valve, high pressure calibration section, stagnant container, low pressure calibration section, low pressure governing valve, low pressure stop valve and vacuum air supply in proper order;
the high-pressure calibrated flow meter is arranged in the high-pressure calibration section, or the high-pressure calibrated flow meter is positioned at the downstream of the adjustable throttle valve and the upstream of the stagnation container;
the critical flow speed nozzle standard meter and the branch stop valve are arranged in the stagnation container, an inlet of the critical flow speed nozzle standard meter is communicated with the upstream of the stagnation container, an outlet of the critical flow speed nozzle standard meter is communicated with an inlet of the branch stop valve, and an outlet of the branch stop valve is communicated with an inlet of the low-pressure calibration section; the low-pressure calibrated flowmeter is arranged in the low-pressure calibration section and is positioned at the upstream of the low-pressure regulating valve and the downstream of the branch stop valve; the inlet of the low-pressure exhaust valve is connected between the low-pressure regulating valve and the low-pressure stop valve; the high-pressure gas source 1 is communicated with the high-pressure stop valve 2 through a filter 16.
Further: the critical flow velocity nozzle standard table comprises five passages, wherein the five passages are specifically a nozzle passage, a nozzle passage and a nozzle passage, the number of branch stop valves is five, and the five branch stop valves are respectively communicated.
Further: the high pressure calibrated flow meter is located upstream of the adjustable flow valve and downstream of the high pressure regulating valve.
The utility model relates to a gas flow standard device with two calibration sections of high-low pressure's beneficial effect is:
the utility model relates to a gas flow standard device with two calibration sections of high-low pressure, the pipeline valve configuration mode of rational design has been designed, adopt critical flow venturi nozzle as the standard table of flow standard device in this device, the characteristics that utilize sonic nozzle upstream and downstream pressure difference set up high pressure calibration section and low pressure calibration section respectively, the advantage of current positive pressure method and negative pressure method flow standard device has been fully low utilized, the operating mode scope of flow calibration has greatly been expanded and the calibration precision has been improved. 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 for 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 requirement, the requirement on the sonic nozzle standard table is reduced, and the construction cost is reduced. Secondly, the calibration capability of the flow standard device is expanded; the high-pressure calibration section can be used for expanding 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 pressure working condition range of calibration is further expanded. Moreover, 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 whole device of the present invention;
FIG. 2 is a structural device diagram of a critical flow velocity nozzle criteria table;
FIG. 3 is a schematic diagram of an embodiment of a critical state high pressure flowmeter calibration;
FIG. 4 is a schematic diagram of an embodiment of a non-critical high pressure flowmeter calibration;
FIG. 5 is a schematic diagram of an embodiment of a low pressure flow meter calibration;
FIG. 6 is a diagram of a state of performing a critical state high pressure flowmeter calibration;
in the figure, 1 is a high-pressure gas 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 flow meter, 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 flow meter, 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 gas source, 16 is a filter, 81 is a first nozzle passage, 82 is a second 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 technical solution of the present invention is further described below with reference to the embodiments, but not limited thereto, and all modifications or equivalent replacements of the technical solution of the present invention may be made without departing from the spirit and scope of the technical solution of the present invention.
Example 1
The embodiment is described with reference to fig. 1, fig. 2, fig. 3 and fig. 4, in this embodiment, a gas flow calibration apparatus with high and low pressure dual calibration sections according to this embodiment includes 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 flow meter 5, a high pressure calibration section 6, a stagnation container 7, a critical flow sonic nozzle calibration table 8, a branch stop valve 9, a low pressure calibrated flow meter 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, an outlet of the high-pressure gas source 1 is sequentially communicated with a high-pressure stop valve 2, a high-pressure regulating valve 3, an adjustable throttle valve 4, a high-pressure calibration section 6, a stagnation container 7, a low-pressure calibration section 11, a low-pressure regulating valve 12, a low-pressure stop valve 14 and a vacuum gas source 15, and the high-pressure calibrated flowmeter 5 is arranged in the high-pressure calibration section 6; the critical flow speed nozzle standard meter 8 and the branch stop valve 9 are arranged in the stagnation container 7, an inlet of the critical flow speed nozzle standard meter 8 is communicated with the upstream of the stagnation container 7, an outlet of the critical flow speed nozzle standard meter 8 is communicated with an inlet of the branch stop valve 9, and an outlet of the branch stop valve 9 is communicated with an inlet of the low-pressure calibration section 11; the low-pressure calibrated flowmeter 10 is arranged in the low-pressure calibration section 11, and the low-pressure calibrated flowmeter 10 is positioned at the upstream of the low-pressure regulating valve 12 and at the downstream of the branch cut-off valve 9; 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. The calibration requirements of calibration and verification of high-pressure working conditions and low-pressure working conditions can be realized by utilizing a set of critical flow sonic nozzles. For the same flow point, the flowmeter can be calibrated under the conditions of a high-pressure working condition and a low-pressure working condition respectively, so that the live calibration is realized, the cost of the device is reduced, and the calibration capability is also expanded. When the low-pressure flowmeter is calibrated, the calibrated low-pressure flowmeter 10 is arranged in a low-pressure calibration section 11 and is positioned at the upstream of a low-pressure regulating valve 12 and the downstream of a branch stop valve 9, and an upstream high-pressure calibration section 6 is connected by equal straight pipes. The high-pressure stop valve 2 is opened, and the high-pressure regulating valve 3 and the adjustable throttle valve 4 are adjusted to change the mass flow in the pipeline so as to meet the flow calibration working condition; partially or completely opening a downstream branch stop valve 9, and after the pressure in the stagnation container 7 is stable, the mass flow flowing out of a critical flow Venturi nozzle standard table 8 is the corrected mass flow; when calibrating the critical type low pressure flow meter, the downstream low pressure regulator valve 12 and the low pressure stop valve 14 are fully opened, allowing the gas flow to flow into the vacuum 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 certified using the mass flow rates set forth in critical flow venturi nozzle standard table 8.
The high-pressure air source 1 is communicated with the high-pressure stop valve 2 through a filter 16, and the filter 16 is used for cleaning the high-pressure air source 1, filtering moisture in compressed air and preventing the moisture from entering the device along with the air.
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, a first eight nozzle passage 84, and a second eight nozzle passage 85, the branch cut-off valves 9 are five, and the five branch cut-off valves 9 are respectively communicated with the downstream of 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 paths, wherein the first path comprises 1 sonic nozzle, the second path comprises 2 sonic nozzles, the third path comprises 4 sonic nozzles, the fourth path comprises 8 sonic nozzles, and the fifth path 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 the critical flow Venturi nozzle standard meter. Through the combined opening of the passages, the continuous opening of 1-23 nozzles can be realized, for example, 13 nozzles can be opened by opening 1, 4 and 8 nozzles of the first passage, the third passage and the fourth passage, so that the adjustment of the flow passing through the standard meter of the sonic nozzle can be realized by opening different nozzles. In addition, through the adjustment of the adjustable throttle valve, the stagnation pressure in front of the nozzle can be changed, and the mass flow passing through the sound speed nozzle standard table is further changed. Therefore, the gas flow rate passing through the critical flow venturi nozzle standard meter can be adjusted not only by the opening amount of the branch shutoff valve, but also by adjusting the stagnation pressure in the stagnation container 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 high-pressure flowmeter in a critical state is calibrated, the calibrated high-pressure flowmeter 5 is arranged in a high-pressure calibration section 6 and is positioned at the downstream of the adjustable throttle valve 4 and the upstream of the stagnation container 7, and a downstream low-pressure calibration section 11 is connected by equal straight pipes. The high-pressure stop valve 2 is opened, and the high-pressure regulating valve 3 is regulated to keep stable high pressure in front of the adjustable throttle valve 4; adjusting the adjustable throttle valve 4 to enable the pressure in front of the calibrated high-pressure flowmeter 5 to reach the pressure of the calibration working condition; partially or completely opening a downstream branch stop valve 9 to enable the mass flow flowing out of a critical flow Venturi nozzle standard table 8 to be equal to the mass flow to be corrected; the downstream low pressure regulator valve 12 and the low pressure exhaust valve 13 are fully opened to allow the gas flow to exit. At this point, the critical class high pressure flow meter 5 is calibrated or certified using the mass flow rate set forth in critical flow venturi nozzle standard table 8.
More specifically: the high-pressure calibrated flow meter 5 is located upstream of the adjustable throttle 4 and downstream of the high-pressure regulating valve 3. When the high-pressure flowmeter in an uncritical state is calibrated, the calibrated high-pressure flowmeter 5 is arranged in a high-pressure calibration section 6 and is positioned at the upstream of the adjustable throttle valve 4 and the downstream of the high-pressure regulating valve 3, and a downstream low-pressure calibration section 11 is connected by equal straight pipes. The high-pressure stop valve 2 is opened, and 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 calibration pressure; adjusting the adjustable throttle valve 4 to change the mass flow flowing in the pipeline so as to meet the flow calibration working condition; partially or completely opening a downstream branch stop valve 9, and after the pressure in the stagnation container 7 is stable, the mass flow flowing out of a critical flow Venturi nozzle standard table 8 is the corrected mass flow; the downstream low pressure regulator valve 12 and the low pressure exhaust valve 13 are fully opened to allow the gas flow to exit. At this point, the critical class high pressure flow meter 5 is calibrated or certified using the mass flow rate set forth in critical flow venturi nozzle standard table 8.
Example 2
The present embodiment is described with reference to embodiment 1, in which the present embodiment relates to a calibration method for a gas flow rate standard device with high and low pressure dual calibration sections, which includes the following steps:
step one, calibrating a high-pressure flowmeter in a critical state by using a high-pressure calibrated flowmeter 5;
step two, calibrating the high-pressure flowmeter in a non-critical state by using 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-pressure and low-pressure double calibration sections and a calibration method can be used for calibrating and verifying a high-pressure working condition flowmeter and a low-pressure working condition flowmeter, and the total mass flow passing through the standard meter can be calculated by the following formula:
in the formula, qmIs the mass flow rate; cdnThe coefficient of flow of the sonic nozzle (n is 1-23); d is the nominal diameter of the throat of the sonic nozzle; c*Is a function of the critical quantity; p0Is the stagnation temperature; t is0Is the stagnation temperature; r is a general gas constant of 8.31441J/(mol.K); m is the gas molar mass, kg/mol.
A high-pressure calibration section is arranged at the upstream of the critical flow Venturi nozzle standard table and is used for installing flow meters working under high-pressure conditions with different sizes, and gas flowing through the high-pressure flow meter to be calibrated can be metered and calibrated through the downstream critical flow sonic nozzle standard table. The calibrated flowmeter of the high-pressure calibration section is relatively small in size, the maximum pressure can reach 3-5 MPa, and the maximum diameter can reach 200 mm.
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 flow meter to be calibrated can be metered and calibrated through the upstream critical flow sonic nozzle standard meter. The maximum working pressure of the calibrated flowmeter of the low-pressure calibration section can reach 1MPa, the minimum working pressure can be 0.05MPa, and the maximum diameter can reach 400 mm. Through the technical scheme, the calibration of the flowmeter with a wide pressure range and a wide size range can be realized by fully utilizing a set of sonic nozzle standard meter.
More specifically: when the high-pressure flowmeter in a critical state is calibrated, the high-pressure calibrated flowmeter 5 is arranged in a high-pressure calibration section 6 and is positioned at the downstream of the adjustable throttle valve 4 and the upstream of the stagnation container 7, and a downstream low-pressure calibration section 11 is connected by equal straight pipes. At this time, the adjustable throttle 4 and the critical flow venturi nozzle standard table 8 downstream of the stagnation vessel 7 are in a critical state, and the pressure P01 upstream of the throttle 4 needs to be sufficiently high in order to make the high pressure critical by the calibration flow meter 5 according to the principle of conservation of flow in the piping. At this time, the following formula is satisfied, and therefore, in the case where P01 is sufficiently high, a1 and A3 are adjusted, but the critical point at a2 is reached.
Opening the high-pressure stop valve 2, adjusting the high-pressure regulating valve 3 to keep stable high pressure P01 in front of the adjustable throttle valve 4; adjusting the adjustable throttle valve 4 to enable the pressure before the high-pressure flow meter 5 is calibrated to reach the pressure P02 of the calibration working condition; the downstream branch cut-off valve 9 is partially or fully opened to change the flow area A3, and the pressure P03 in the stagnation container 7 can be adjusted to make the mass flow rate flowing out of the critical flow Venturi nozzle standard table 8 equal to the corrected mass flow rate; the downstream low pressure regulator valve 12 and the low pressure exhaust valve 13 are fully opened to allow the gas flow to exit. At this point, the critical class high pressure flow meter 5 is calibrated or certified using the mass flow rate set forth in critical flow venturi nozzle standard table 8.
More specifically: when the high-pressure flowmeter in a non-critical state is calibrated, the calibrated high-pressure flowmeter 5 is arranged in a high-pressure calibration section 6 and is positioned at the upstream of the adjustable throttle valve 4 and the downstream of the high-pressure regulating valve 3, and a downstream low-pressure calibration section 11 is connected by equal straight pipes. The high-pressure stop valve 2 is opened, and 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 calibration pressure; adjusting the adjustable throttle valve 4 to change the mass flow flowing in the pipeline so as to meet the flow calibration working condition; partially or completely opening a downstream branch stop valve 9, and after the pressure in the stagnation container 7 is stable, the mass flow flowing out of a critical flow Venturi nozzle standard table 8 is the corrected mass flow; the downstream low pressure regulator valve 12 and the low pressure exhaust valve 13 are fully opened to allow the gas flow to exit. At this point, the critical class high pressure flow meter 5 is calibrated or certified using the mass flow rate set forth in 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 a low-pressure calibration section 11 and is positioned at the upstream of a low-pressure regulating valve 12 and the downstream of a branch stop valve 9, and an upstream high-pressure calibration section 6 is connected by adopting equal straight pipes. The high-pressure stop valve 2 is opened, and the high-pressure regulating valve 3 and the adjustable throttle valve 4 are adjusted to change the mass flow in the pipeline so as to meet the flow calibration working condition; partially or completely opening a downstream branch stop valve 9, and after the pressure in the stagnation container 7 is stable, the mass flow flowing out of a critical flow Venturi nozzle standard table 8 is the corrected mass flow; when calibrating the critical type low pressure flow meter, the downstream low pressure regulator valve 12 and the low pressure stop valve 14 are fully opened, allowing the gas flow to flow into the vacuum source 15. When calibrating the low pressure flowmeter 10 under the non-critical positive and negative pressure conditions, the downstream low pressure regulating valve 12 needs to be adjusted to make the pressure before the calibrated flowmeter reach the calibrated pressure condition, and the vacuum air source 15 needs to be opened at the moment. The critical class low pressure flow meter 10 is calibrated or certified using the mass flow rate flowing out of the critical flow venturi nozzle standard table 8.
Example 3
The present embodiment is described in conjunction with embodiment 1 and embodiment 2,
1) when performing a critical state high pressure flow meter calibration, the high pressure is centered between the adjustable choke 4 and the stagnation vessel 7 by the calibrated flow meter 5, the actual state is similar to fig. 6, the calibrated flow meter is located at section a2, the adjustable choke 4 is located at section a1, and the stagnation vessel 7 is the space in front of section A3. In the process, P01> P02> P03, A1< A2< A3, A2/A1> k1, P01/P03> k2, k1 and k2 are all values larger than 1; the condition of the pipeline set according to the area can enable the calibrated flowmeter at the section 2 to reach a critical condition, namely the sound velocity at the throat, as long as the P01 is high enough. I.e., to provide the ability to calibrate a critical flow meter.
2) When performing a non-critical state high pressure flow meter calibration, the high pressure is centered between the high pressure regulator valve 3 and the adjustable throttle valve 4 by the calibrated flow meter 5, the actual state being similar to fig. 6, the calibrated flow meter being located at section a2 and the adjustable throttle valve 4 being located at section a 1. When A1 is greater than A2, A2 is < A3, P02 is approximately equal to P01> P03; the pipeline state set according to the area is that the throttling is carried out at the section A1, the flow area at the section A2 is larger, and the section A2 can only be in a non-critical state. At this point, the ability to calibrate a critical flow meter may be provided before section a 1.
The flow through number of the adjustable throttle 4 and critical flow venturi nozzle standard gauge 8 (at section 3) are both adjustable, in effect changing the area to match the pressure, further achieving either a critical or non-critical condition.
Claims (3)
1. A gas flow standard device with high and 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 flow meter (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 flow meter (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 (,
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 critical flow speed nozzle standard meter (8) and the branch stop valve (9) are arranged in the stagnation container (7), the inlet of the critical flow speed nozzle standard meter (8) is communicated with the upstream of the stagnation container (7), the outlet of the critical flow speed nozzle standard meter (8) is communicated with the inlet of the branch stop valve (9), and the outlet of the branch stop valve (9) is communicated with the inlet of the low-pressure calibration section (11); the low-pressure calibrated flowmeter (10) is arranged in the low-pressure calibration section (11), and the low-pressure calibrated flowmeter (10) is positioned at the upstream of the low-pressure regulating valve (12) and the downstream of the branch cut-off valve (9); 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);
the high-pressure air source (1) is communicated with the high-pressure stop valve (2) through a filter (16).
2. The gas flow calibration device with high and low pressure dual calibration sections as claimed in claim 1, wherein said critical flow velocity nozzle calibration table (8) comprises five passages, specifically a nozzle passage (81), a two nozzle passage (82), a four nozzle passage (83), and a first eight nozzle passage (84) and a second eight nozzle passage (85), said branch cut-off valves (9) are five, and five branch cut-off valves (9) are respectively communicated with the downstream of the five passages.
3. A gas flow calibration device with high and low pressure dual calibration stages according to claim 2, characterized in that 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).
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| CN113253606A (en) * | 2021-06-11 | 2021-08-13 | 中国空气动力研究与发展中心低速空气动力研究所 | Calibration box high-pressure air supply and vacuum air suction combined control system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113253606A (en) * | 2021-06-11 | 2021-08-13 | 中国空气动力研究与发展中心低速空气动力研究所 | Calibration box high-pressure air supply and vacuum air suction combined control system and method |
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