CN102116666A - Constant-temperature sonic nozzle process gas flow calibration facility and constant-temperature stagnation vessel - Google Patents
Constant-temperature sonic nozzle process gas flow calibration facility and constant-temperature stagnation vessel Download PDFInfo
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- CN102116666A CN102116666A CN 201110001345 CN201110001345A CN102116666A CN 102116666 A CN102116666 A CN 102116666A CN 201110001345 CN201110001345 CN 201110001345 CN 201110001345 A CN201110001345 A CN 201110001345A CN 102116666 A CN102116666 A CN 102116666A
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Abstract
The invention provides a constant-temperature sonic nozzle process gas flow calibration facility and a constant-temperature stagnation vessel. The constant-temperature sonic nozzle process gas flow calibration facility comprises a straight pipe line in front of a meter, a detected flowmeter, a stagnation vessel and a gas source assembly which are connected in sequence, wherein the stagnation vessel is provided with a sonic nozzle as a standard meter, a wall of the stagnation vessel is a vessel wall with a water interlayer, a water inlet pipe and a water outlet pipe of the vessel wall with the water interlayer are communicated with a constant-temperature water storage body, and a circulating driving pump is arranged to form a constant temperature circulating channel. In the technical scheme, the effect of external factors on detection temperature is prevented, so that the whole gas flow detection and calibration operation to be accurately carried out in a stable condition, the high-frequency vibration can be greatly reduced and the working noise can be greatly lowered.
Description
Technical field
What patented claim of the present invention related to is gas meter calibrating, calibrating installation.
Background technology
As shown in Figure 1, experiment pipeline 1, tested flowmeter 2, the sonic nozzle proving flowmeter 4 that is arranged at stagnation container 3 before the table, vacuum pump (or air compressor machine) 7 are arranged is main source of the gas assembly to the basic composition of existing sonic nozzle method gas flow standard device.Its principle of work is: vacuum pump (or air compressor machine) work, testing pipeline, tested flowmeter, sonic nozzle and vacuum pump (or air compressor machine) before the table of suction air via the upstream discharges, by, according to the gas dynamics principle, when the pressure ratio of sonic nozzle upstream and downstream reaches critical conditions, when the air-flow of sonic nozzle throat reaches velocity of sound or local sonic speed, mass rate by sonic nozzle is only relevant with characteristic, temperature and the stagnation container entrance place pressure of nozzle itself, not influenced by free state.Based on this principle, be standard scale with the sonic nozzle, by the contrast that the flow and the tested flowmeter of sonic nozzle are indicated flow, finish the calibrating of tested flowmeter.The computing formula of the gas flow by sonic nozzle: q
m=A* C
d* C
R* P
o/ √ T
o* R/M, in the formula: q
m---instantaneous mass flow, units/h, A---area of nozzle throat, C
d---department provides by calibrating, C
R---in correlation table, can find P to certain gas
o---the absolute pressure of gas in the stagnation container, the Pa of unit, T
o---the nozzle entrance place absolute temperature in the stagnation container, the k of unit, R---gas law constant, M---gas Mach number.By above formula as seen: instantaneous mass flow q
mRelevant with each value in the formula, in fact A, C in the formula
d, C
RPromptly be definite value after sonic nozzle completes, R, M depend on the character of gas medium, generally can not change P
oIn a verification process, also can not change, can regard as invariant equally, so temperature is the factor that verification result is had the greatest impact.In the reality calibrating, various factors all can make temperature value change and influence calibrating, calibration effect, as calibrating flow, pump motor watt level, indoor and outdoor temperature or the like.Generally examining and determine in the environment generally has temperature effect is the most tangible: when throughput ratio is big, in the air inlet chamber of outdoor a large amount of different temperatures, bring bigger temperature change; When adopting the room air circulation time, because big flow is in service, the overall power of vacuum pump or air compressor machine is bigger, produce a large amount of heat in the vacuum pump of hundreds of kilowatt or the air compressor machine work, can accumulate along with calibration operation time lengthening increases, cause the air themperature that recycles more and more higher, so that have a strong impact on the calibrating effect.In addition, in the present sonic nozzle method gas flow standard device work, when the calibrating throughput ratio was big, parts such as stagnation container can produce vibration and vibrating noise, and this also all is that people do not wish to see.Above technical matters is prevalent in the existing various sonic nozzle method gas flow standard device, does not also have corresponding otherwise effective technique solution.
Summary of the invention
The goal of the invention of patented claim of the present invention be to intercept extraneous factor to the influence of proving temperature, a kind of thermostatic type sonic nozzle method gas flow standard device and thermostatic type stagnation container are provided.The technical scheme of the thermostatic type sonic nozzle method gas flow standard device that the present patent application provides, its major technique content is: a kind of thermostatic type sonic nozzle method gas flow standard device, it comprises the table that connects successively preceding straight pipe-line, tested flowmeter, is provided with stagnation container and source of the gas assembly that sonic nozzle is a standard scale, the chamber wall of stagnation container wherein is the water interlayer chamber wall, the water inlet pipe of water interlayer chamber wall and rising pipe are communicated with the constant temperature water storage, the circulation driving pump is set constitutes the thermostatted water circulation passage.
In above-mentioned overall technical architecture, in order better to isolate the influence of external environment to proving temperature, circulating current better is stabilized in required temperature value scope, straight pipe-line, tested flowmeter and to be provided with sonic nozzle be that the stagnation container of standard scale is arranged in the sealing chamber before the table, the vacuum pump in the source of the gas assembly or the exhaust of air compressor machine pass to the encapsulation chamber by the inlet of underground air duct, be provided with the constant temperature heat exchange coil in the ground in the air channel, this constant temperature heat exchange coil inserts water circulation channel.
In above-mentioned overall technical architecture, the water interlayer water inlet pipe of stagnation container and rising pipe are arranged at the radial and axial at a distance of the farthest of this container.
The present patent application also provides a kind of thermostatic type stagnation container technique scheme, and the chamber wall of this thermostatic type stagnation container is the water interlayer chamber wall, and the water interlayer chamber wall is provided with and is used for the rising pipe and the water inlet pipe that are connected with constant temperature water storage pipeline.
In above-mentioned thermostatic type stagnation container technique scheme, it is radial and axial at a distance of the farthest that rising pipe and water inlet pipe are arranged at container.
The technical scheme of the thermostatic type sonic nozzle method gas flow standard device that patented claim of the present invention provides, in whole device is formed, the stagnation container adopts water interlayer isolation structure and underground air duct structure to be provided with, fully isolate and avoid ambient temperature to the calibrating air themperature influence, can be effective and stable sonic nozzle upstream air medium temperature be stabilized in the required temperature value scope, on this basis, pass through underground air duct, especially the constant temperature heat exchange coil of setting up in the underground air duct, make air in certain space in relative stationary temperature scope closed loop cycle, then in whole calibrating and calibration process, the temperature of calibrating medium can both keep stable, eliminate the influence of temperature to greatest extent, and can enlarge the air-flow calibrating of this device calibrating and calibration, the calibration range ability.In addition, the stagnation container adopts the water interlayer chamber wall, has cut down dither greatly, its work noise is reduced greatly.The technical program also is applicable in the calibrating in parallel of many flowmeters, the verification structure, also is suitable as the test unit of gas flow aspect.
Description of drawings
Fig. 1 is the general assembly structural drawing of this thermostatic type sonic nozzle method gas flow standard device
Fig. 2 is the plan structure figure of the thermostatic type sonic nozzle method gas flow standard device of many flowmeters
Fig. 3 is the radially sectional structure chart of this thermostatic type stagnation container
Fig. 4 is the partial enlarged drawing of Fig. 3
Fig. 5 is the pie graph of thermostatted water circulation passage.
Embodiment
The present patent application thermostatic type sonic nozzle required for protection method gas flow standard device; as shown in Figure 1; it comprises the preceding straight pipe-line 1 of the table that connects successively; tested flowmeter 2; be provided with sonic nozzle 4 and be the stagnation container 3 of standard scale and source of the gas assembly; described source of the gas assembly comprises vacuum pump or air compressor machine 7; pressure reserveir 12; suction and discharge pipeline and exhaust box are formed; wherein the chamber wall of stagnation container 3 adopts water interlayer chamber wall 3-0; the water inlet pipe 3-1 of water interlayer formula chamber wall 3-0 and rising pipe 3-2 and constant temperature water storage are connected; in the present embodiment structure; the constant temperature water storage is constant temperature pond 11; circulation is set drives water pump 5 common formation water circulation channels, by the constant temperature water body calibrating media in the stagnation container 3 are given constant temperature and handle.The water inlet pipe 3-1 of the water interlayer chamber wall 3-0 of stagnation container 3 and rising pipe 3-2 are arranged at the radial and axial at a distance of the farthest of this stagnation container 3.In order to make the round-robin air-flow better be stabilized in required temperature value scope, straight pipe-line 1 before the table, tested flowmeter 2 and be provided with sonic nozzle 4 and be arranged in the sealing chamber 6 for the stagnation container 3 of standard meter, vacuum pump in the source of the gas assembly or air compressor machine 7 exhausts feed the inlet 9 of the underground air duct 8 that is communicated to encapsulation chamber 6, be provided with constant temperature heat exchange coil 10 in the underground air duct 8, water circulation channel is gone in the in parallel or series connection of constant temperature heat exchange coil 10 and stagnation container 3, as shown in Figure 5, the constant temperature water quality by constant temperature pond 11 force the air dielectric in the stagnation container and the air dielectric temperature constant that circulates in a required numerical range.As shown in Figure 2, this structure also is suitable as calibrating, the calibration component devices of many flowmeters.
Claims (5)
1. thermostatic type sonic nozzle method gas flow standard device, it comprises the table that connects successively preceding straight pipe-line, tested flowmeter, is provided with stagnation container and source of the gas assembly that sonic nozzle is a standard scale, the chamber wall that it is characterized in that stagnation container wherein is the water interlayer chamber wall, the water inlet pipe of water interlayer chamber wall and rising pipe are communicated with the constant temperature water storage, the circulation driving pump is set constitutes the thermostatted water circulation passage.
2. gas flow standard device according to claim 1, it is characterized in that showing preceding straight pipe-line, tested flowmeter and being provided with sonic nozzle is that the stagnation container of standard scale is arranged in the sealing chamber, vacuum pump in the source of the gas assembly or air compressor machine exhaust feed the underground air duct inlet, underground air duct is communicated to sealing chamber, be provided with the constant temperature heat exchange coil in the underground air duct, this constant temperature heat exchange coil inserts water circulation channel.
3. gas flow standard device according to claim 1 is characterized in that the water interlayer water inlet pipe of stagnation container and rising pipe are arranged at the radial and axial at a distance of the farthest of this container.
4. thermostatic type stagnation container, the chamber wall that it is characterized in that this thermostatic type stagnation container is the water interlayer chamber wall, the water interlayer chamber wall is provided with and is used for the rising pipe and the water inlet pipe that are connected with constant temperature water storage pipeline.
5. gas flow standard device according to claim 4 is characterized in that rising pipe and water inlet pipe are arranged at the radial and axial farthest apart of container.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110001345 CN102116666A (en) | 2011-01-05 | 2011-01-05 | Constant-temperature sonic nozzle process gas flow calibration facility and constant-temperature stagnation vessel |
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|---|---|---|---|
| CN 201110001345 CN102116666A (en) | 2011-01-05 | 2011-01-05 | Constant-temperature sonic nozzle process gas flow calibration facility and constant-temperature stagnation vessel |
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| CN102116666A true CN102116666A (en) | 2011-07-06 |
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| CN 201110001345 Pending CN102116666A (en) | 2011-01-05 | 2011-01-05 | Constant-temperature sonic nozzle process gas flow calibration facility and constant-temperature stagnation vessel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104501917A (en) * | 2015-01-04 | 2015-04-08 | 镇江市计量检定测试中心 | Ultra-large diameter sonic nozzle block type gas flowmeter calibrating device |
| CN115507289A (en) * | 2022-09-19 | 2022-12-23 | 浙江天辰测控科技股份有限公司 | Stagnation container and gas meter detection device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5338113A (en) * | 1990-09-06 | 1994-08-16 | Transsonic Uberschall-Anlagen Gmbh | Method and device for pressure jumps in two-phase mixtures |
| CN101392244A (en) * | 2007-09-21 | 2009-03-25 | 百瑞全球有限公司 | Solid catalyst reaction equipment and running method thereof |
| CN201628569U (en) * | 2010-03-04 | 2010-11-10 | 辽宁省计量科学研究院 | High-pressure back-blowing bell-type gas flow standard apparatus |
| CN201648276U (en) * | 2010-01-22 | 2010-11-24 | 中国科学院上海应用物理研究所 | Grafting reaction device for pre-irradiation grafting |
-
2011
- 2011-01-05 CN CN 201110001345 patent/CN102116666A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5338113A (en) * | 1990-09-06 | 1994-08-16 | Transsonic Uberschall-Anlagen Gmbh | Method and device for pressure jumps in two-phase mixtures |
| CN101392244A (en) * | 2007-09-21 | 2009-03-25 | 百瑞全球有限公司 | Solid catalyst reaction equipment and running method thereof |
| CN201648276U (en) * | 2010-01-22 | 2010-11-24 | 中国科学院上海应用物理研究所 | Grafting reaction device for pre-irradiation grafting |
| CN201628569U (en) * | 2010-03-04 | 2010-11-10 | 辽宁省计量科学研究院 | High-pressure back-blowing bell-type gas flow standard apparatus |
Non-Patent Citations (1)
| Title |
|---|
| 《自动化仪表》 20090831 郭爱华 标准表法气体流量标准装置 第30卷, 第8期 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104501917A (en) * | 2015-01-04 | 2015-04-08 | 镇江市计量检定测试中心 | Ultra-large diameter sonic nozzle block type gas flowmeter calibrating device |
| CN104501917B (en) * | 2015-01-04 | 2018-09-18 | 镇江市计量检定测试中心 | Super large caliber sonic nozzle group formula gas flowmeter calibrating installation |
| CN115507289A (en) * | 2022-09-19 | 2022-12-23 | 浙江天辰测控科技股份有限公司 | Stagnation container and gas meter detection device |
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Application publication date: 20110706 |