CN203949715U - Gas micro-flow meter on-line calibration device - Google Patents
Gas micro-flow meter on-line calibration device Download PDFInfo
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- CN203949715U CN203949715U CN201420371969.5U CN201420371969U CN203949715U CN 203949715 U CN203949715 U CN 203949715U CN 201420371969 U CN201420371969 U CN 201420371969U CN 203949715 U CN203949715 U CN 203949715U
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Abstract
The utility model provides a kind of gas micro-flow meter on-line calibration device, and this device comprises constant flow device, normal flow sensor and calibration pipeline; Being calibrated gas micro-flow meter is placed between constant flow device and normal flow sensor; Constant flow device is accessed successively and is calibrated gas micro-flow meter and normal flow sensor by calibration pipeline.The utility model provides the reliable gas micro-flow meter of a kind of calibration result on-line calibration device.
Description
Technical field
The utility model belongs to gas tiny flow quantity metering field, relate to a kind of gas micro-flow meter on-line calibration device that can detect multiple gases, relate in particular to a kind of for IPSEN low-pressure carburization furnace gases (acetylene gas) mass flow controller being carried out to the device of on-line calibration.
Background technology
Most unit adopts proving flowmeter calibration system, the artificial method of reading that adopts tested table to compare with standard scale, calibration process needs reading, record data, adjust flux, the error of calculation repeatedly, exist artificial reading error (0.16%), thereby increased the overall uncertainty (0.5%) of whole calibrating installation; In addition, generally adopt the automated calibration system taking " KingView " as industrial control software both at home and abroad, automatically gather the signal of tested table and standard scale, calculated by the automatic data acquisition processing of computing machine, error, thereby greatly reduce personal error, improved work efficiency.
Because IPSEN low-pressure carburization furnace gases mass flow controller is industrial flow rate test and feedback control system, not quick detachable censorship, and domestic gas flow calibrating device is all large-scale fixing calibrating/calibrating installation, calibrate IPSEN low-pressure carburization stove mass flow controller at the scene should not arrived, and calibrate medium is acetylene gas, domestic do not have an acetylene medium calibrating installation.Domestic only have laboratory bell jar calibrating installation, large flow sonic nozzle calibrating installation, and medium only has air, belongs to national gas flow amount and pass benchmark, is difficult for portablely, uses inconvenience.
Utility model content
In order to solve the above-mentioned technical matters existing in background technology, the utility model provides the reliable gas micro-flow meter of a kind of calibration result on-line calibration device.
Technical solution of the present utility model is: the utility model provides a kind of gas micro-flow meter on-line calibration device, and its special character is: described gas micro-flow meter on-line calibration device comprises constant flow device, normal flow sensor and calibration pipeline; Being calibrated gas micro-flow meter is placed between constant flow device and normal flow sensor; Described constant flow device is accessed successively and is calibrated gas micro-flow meter and normal flow sensor by calibration pipeline.
Above-mentioned constant flow device comprises input end constant rate operation valve, and described input end constant rate operation valve accesses gas micro-flow meter to be calibrated and normal flow sensor successively by calibration pipeline.
Above-mentioned constant flow device comprises output terminal constant rate operation valve, and described normal flow sensor is by calibration pipeline access output terminal constant rate operation valve.
Above-mentioned gas micro-flow meter on-line calibration device also comprises and is separately positioned on normal flow sensor both sides and pressure gauge and the thermometer of calibration on pipeline is set.
The utility model has the advantages that:
The utility model provides a kind of gas micro-flow meter on-line calibration device, the initial object of this device is just solution company one IPSEN of branch low-pressure carburization stove acetylene gas mass flowmeter on-line calibration, existing device provided by the utility model also can be realized laboratory simulations working condition (pressure, temperature) former rate-of flow calibration, staking-out work, can carry out 14 kinds of gas flows accurately measures and gas flow control, being applied to air-tight test amount of leakage measures, part carburizing, nitriding gas (acetylene, nitrogen, ammonia) flow control, the control of argon arc welding process gas flow, also be applied to container, pipeline gas displacement flow control (rock gas, fluid combination gas), former dielectric gas suspended body flowmeter calibration and checkout.
Brief description of the drawings
Fig. 1 is gas micro-flow meter on-line calibration principle of device schematic diagram provided by the utility model;
Fig. 2 is the gas circuit model schematic diagram of gas micro-flow meter on-line calibration device provided by the utility model;
Wherein:
1-is calibrated gas micro-flow meter; 2-pressure gauge; 3-normal flow sensor; 4-valve; 5-thermometer; 6-source of the gas; 7-the first needle-valve; 8-the first differential pressure valve; 9-air-capacitor; 10-the second needle-valve; 11-the second differential pressure valve.
Embodiment
Referring to Fig. 1, the utility model provides a kind of gas micro-flow meter on-line calibration device, and this gas micro-flow meter on-line calibration device comprises constant flow device, normal flow sensor 3, calibration pipeline and valve 4; Being calibrated gas micro-flow meter 1 is placed between constant flow device and normal flow sensor 3; Horizontal flow apparatus is accessed successively and is calibrated gas micro-flow meter 1 and normal flow sensor 3 by calibration pipeline.
Constant flow device comprises input end constant rate operation valve, and input end constant rate operation valve is accessed successively and is calibrated gas micro-flow meter 1 and normal flow sensor 3 by calibration pipeline.
Constant flow device comprises output terminal constant rate operation valve, and normal flow sensor 3 is by calibration pipeline access output terminal constant rate operation valve.
Gas micro-flow meter on-line calibration device also comprises and is separately positioned on normal flow sensor 3 both sides and pressure gauge 2 and the thermometer 5 of calibration on pipeline is set.
The key of gas micro-flow meter on-line calibration device provided by the utility model is on-the-spot flow measurement and flow control; The key of Flow Measuring System for the control (pressure control) of traffic sources stability in gas micro-flow meter on-line calibration device, the control of temperature, selection, the selection of proving flowmeter and the processing of data of measuring method.
Principle of work of the present utility model is: using normal flow sensor 3 as Main Regulator, be equipped with field calibration pipeline simultaneously, the parts such as thermometer 5, pressure gauge 2 form, sealed in gas micro-flow meter 1 to be calibrated, make fluid continuous stream cross gas micro-flow meter 1 to be calibrated and normal flow sensor 3, determine the error of measured flux measuring system by relative method.
The principle of the constant flow device that the utility model adopts is: from hydromechanical angle, gas Small Flow Control is to utilize certain device in gas atmosphere loop, to cause a kind of shock resistance, and by changing the size of shock resistance, reach adjust flux a kind of control method that is changed to object.Flowrate control valve is to adopt this principle to realize flow (or flow velocity) control by changing the circulation area of valve.Needle-valve belongs to the one in flowrate control valve, operated by rotary motion in loop, the gas flow being passed through to control.
The theoretical foundation of constant flow device design is fluid mechanics, and design object is the compressibility gas mobile in subsonic area; When gas positive pressure power changes, the character that volume changes is thereupon called the compressibility of gas, and in the time that the front and back of throttling valve pressure meets, gas flow rate is in subsonic area; Compressibility gas flow rate in the time of subsonic area, the flow formula by throttling pore:
In formula: Q-----is (benchmark) state flow (atmospheric pressure: 0.101325MPa) freely, m3/min; T-----gas absolute temperature, K;
The circulation area of S----needle-valve, m
2;
P1, pressure before and after p2----needle-valve, MPa;
Δ p----needle-valve front and back end pressure reduction, MPa; Δ p=p
1-p
2.
Be not difficult to find out from this flow formula, as long as ensure that (or rear) end pressure and front and back end pressure reduction are constant before needle-valve, just can realize the constant flow by throttling valve.
The on-the-spot flow calibrating apparatus of gas needs constant gaseous fluid (to comprise pipeline input, the constant inlet and outlet pressure of output needs; Temperature and incompressible pipeline air-capacitor), (wherein, the first needle-valve 7 and the first differential pressure valve 8 form the constant flow device of input end constant pressure therefore its gas circuit modelling to be become to structure as shown in Figure 2; The second needle-valve 10 and the second differential pressure valve 11 form the constant constant flow device of output end pressure; The constant flow device of input end constant pressure is connected by the air-capacitor 9 constant flow device constant with output end pressure, source of the gas 6 inputs to the constant flow device of input end constant pressure), constant flow device by input end constant pressure is inflated (being pressure process) to the on-the-spot flow apparatus of gas, by the constant constant flow device of output end pressure to the on-the-spot flow apparatus venting of gas (being decompression process), for the ease of analyzing and studying a question, make the following assumptions specially:
(1) at normal temperatures and pressures, studied actuating medium is regarded as to ideal gas, the Ideal-Gas Equation PV=mRT is also suitable for and describes the relation between each gaseous state parameter in flowing gas micelle;
(2) gas flow process is constant entropy (reversible thermal insulation) process, and when closed containing cavity inflation/deflation, gas and the exchange of extraneous empty calory, be considered as adiabatic process; (on-the-spot gas flowrate calibrating device is calibrated to the as far as possible short of circuit design)
(3) when gas flows through valve port, ignore the impact of viscous resistance, and it is very little to its properties influence to think that gas temperature changes, and is considered as constant entropy adiabatic process; (by on-the-spot gas flowrate calibrating device calibration pipeline inner chamber solder joint and excessive partly do smooth of connection, without burr)
(4) think that system produces without the phenomenon of condensing in inflation/deflation process; (on-the-spot gas flowrate calibrating device is calibrated to the as far as possible short of circuit design)
(5) ignore leakage everywhere.
From supposing above, the air-capacitor C that determines the on-the-spot flow calibration tube road of volume is certain, by goal pressure p
tpoor Δ p with the former pressure p in air-capacitor
tcan calculate the gaseous mass Δ m that need to be filled with or emit:
Because the volumetric flow rate of the free state gas by constant flow device in the unit interval is certain, again because be isoentropic process, so the density of gas is also known, therefore mass rate is also certain.Just can realize target pressure as long as control the inflation/deflation time of constant flow device.
Verification experimental verification
Pneumatic element is coupled together according to the gas circuit model shown in Fig. 2, with the DPI610 digital pressure gauge monitoring air-capacitor pressure of DRUCK, use stopwatch writing time, be to test under 2.0MPa, certain pin valve opening at bleed pressure, the constant flow characteristic of checking constant flow device, test figure is as shown in table 1.
Table 1 test figure
| Digital pressure gauge registration/MPa | Elapsed-time standards/S | Average velocity/kPa/s |
| 0～0.515 | 14 | 36.8 |
| 0.515～1.017 | 14 | 35.9 |
| 1.017～1.505 | 13 | 37.5 |
| 1.505～2.017 | 14 | 36.6 |
| 2.017～1.498 | 15 | -34.6 |
| 1.498～0.988 | 15 | -34.0 |
| 0.988～0.486 | 15 | -33.5 |
| 0.486～0 | 15 | -32.4 |
Can find out from test figure, under bleed pressure and the constant condition of atmospheric pressure, Heng Liu Liang Installed puts has constant flow characteristic.
Can prove from above discussion: the accuracy that ensure on-the-spot small amount of flow measuring is reliable, necessarily require the relative constant of on-the-spot flowrate calibrating device import and exit gas pressure differential.Being not difficult to imagine only on-the-spot flowrate calibrating device to be assumed to be to an air-capacitor device, is exactly the best hypothesis of an on-the-spot relative method small amount of flow measuring system so.
The on-the-spot flowrate calibrating device of gas has carried out onsite acceptance, and has carried out field adjustable, debugs after qualified and has carried out IPSEN low-pressure carburization furnace gases mass flowmeter field-checking.Its calibration data is as follows:
IPSEN low-pressure carburization furnace gases mass flowmeter calibration data and evaluation result:
Above test result shows:
This development device working stability, three times test data repeatability meets technical requirement (0.3%); This development device technique dependable performance, accurate, three times test data result is consistent, and evaluation result all meets the one-level result of appraisal: this development device meets technical indicator, can carry out the work of 14 kinds of gas flow on-line calibrations.Measurement range: (0.1～250) L/min measuring accuracy: ± 1%.
Claims (4)
1. a gas micro-flow meter on-line calibration device, is characterized in that: described gas micro-flow meter on-line calibration device comprises constant flow device, normal flow sensor and calibration pipeline; Being calibrated gas micro-flow meter is placed between constant flow device and normal flow sensor; Described constant flow device is accessed successively and is calibrated gas micro-flow meter and normal flow sensor by calibration pipeline.
2. gas micro-flow meter on-line calibration device according to claim 1, it is characterized in that: described constant flow device comprises input end constant rate operation valve, described input end constant rate operation valve accesses gas micro-flow meter to be calibrated and normal flow sensor successively by calibration pipeline.
3. gas micro-flow meter on-line calibration device according to claim 2, is characterized in that: described constant flow device comprises output terminal constant rate operation valve, and described normal flow sensor is by calibration pipeline access output terminal constant rate operation valve.
4. according to the gas micro-flow meter on-line calibration device described in claim 1 or 2 or 3, it is characterized in that: described gas micro-flow meter on-line calibration device also comprises and is separately positioned on normal flow sensor both sides and pressure gauge and the thermometer of calibration on pipeline is set.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420371969.5U CN203949715U (en) | 2014-07-07 | 2014-07-07 | Gas micro-flow meter on-line calibration device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420371969.5U CN203949715U (en) | 2014-07-07 | 2014-07-07 | Gas micro-flow meter on-line calibration device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108318110A (en) * | 2017-12-25 | 2018-07-24 | 中核北方核燃料元件有限公司 | A kind of minute gas meter proof calibrating installation |
| CN110873591A (en) * | 2019-12-04 | 2020-03-10 | 合肥工业大学 | Gas micro-flow sensing device based on molecular flow transmission |
| CN114061933A (en) * | 2021-11-22 | 2022-02-18 | 中国科学院空间应用工程与技术中心 | System and method for testing flow characteristics and flow resistance of universal intelligent pneumatic component |
-
2014
- 2014-07-07 CN CN201420371969.5U patent/CN203949715U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108318110A (en) * | 2017-12-25 | 2018-07-24 | 中核北方核燃料元件有限公司 | A kind of minute gas meter proof calibrating installation |
| CN110873591A (en) * | 2019-12-04 | 2020-03-10 | 合肥工业大学 | Gas micro-flow sensing device based on molecular flow transmission |
| CN114061933A (en) * | 2021-11-22 | 2022-02-18 | 中国科学院空间应用工程与技术中心 | System and method for testing flow characteristics and flow resistance of universal intelligent pneumatic component |
| CN114061933B (en) * | 2021-11-22 | 2022-07-15 | 中国科学院空间应用工程与技术中心 | System and method for testing flow characteristics and flow resistance of universal intelligent pneumatic component |
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