CN203053507U - Gas flow metering device - Google Patents
Gas flow metering device Download PDFInfo
- Publication number
- CN203053507U CN203053507U CN 201320059827 CN201320059827U CN203053507U CN 203053507 U CN203053507 U CN 203053507U CN 201320059827 CN201320059827 CN 201320059827 CN 201320059827 U CN201320059827 U CN 201320059827U CN 203053507 U CN203053507 U CN 203053507U
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- CN
- China
- Prior art keywords
- gas flow
- counter
- rotary encoder
- metering device
- detection unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The utility model belongs to the technical field of environmental monitoring, and relates to a gas flow metering device. The gas flow metering device comprises a dry-type gas flow meter (2), a rotary encoder (1) and a counter (10), wherein the rotary encoder (1) comprises an encoding disc (12) and a detection unit, the encoding disc (12) is fixed on a transmission shaft (13) of a counting disc of the dry-type gas flow meter (2), the detection unit is used for detecting the angular displacement of the encoding disc (12), pulse signals output by the detection unit are sent into the counter (10), and the counter (10) meters the size of gas according to the number of output pulses of the rotary encoder (1). The high-precision gas flow metering device is suitable for various single or complex smoke compositions and the smoke flow velocity monitoring domain is wide at the same time, so that a flow error meets requirements of a sampling standard.
Description
Technical field
The utility model relates to the measuring apparatus in a kind of environmental monitoring field, is specifically related to a kind of device for metering flue gas sampling volume.
Background technology
At present, the flue gas sampling device has multiple, and wherein the sampling volume metering method mainly contains two kinds: differential pressure flowmeter and mass flowmeter.Mainly be because the technology maturation of this dual mode and corresponding national standard is arranged as support.But weak point is arranged also: differential pressure flowmeter is made up of detection piece (primary device) and pressure reduction conversion, flow displaying instrument (secondary device), it is to utilize restriction orifice to produce pressure reduction, come the calculating sampling volume by pressure reduction, it is more accurate that this kind flowmeter is measured the bigger sampling volume of flue gas flow rate, and stable and reliable for performance, long service life, but for the less flue gas of flow velocity, because the vapour lock of pipeline own and pressure transducer sensitivity restriction, it is bigger to produce error.Mass flowmeter is to utilize the specific heat of gas molecule to measure sampling volume, and this kind flowmeter is fit to the measurement of gas flow of one-component, and is bigger to the flue gas flow error in dipping of composition more complicated.And new flue gas mercury standard for manual sampling is brought up to the sampling flow error requirements ± 2% scope in, present measurement of gas flow mode is difficult to meet the demands.
The utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of wider high-precision gas flow measurement device of various single or complicated smoke components and flue gas flow rate monitoring territory that is fit to is provided, and makes flow error meet the requirement of standard for manual sampling.
A kind of measurement of gas flow device, comprise dry type gas meter (2), rotary encoder (1) sum counter (10), described rotary encoder comprises code-wheel (12) and detecting unit, described code-wheel (12) is fixed on the transmission shaft of dry type gas meter counting scale (13), detecting unit is for detection of the angular displacement of code-wheel, the pulse signal of its output is admitted to counter, and counter is according to the volume of the number metering gas of the output pulse of rotary encoder.
The utility model improves common dry type gas meter, utilizes counter and rotary encoder to realize the accurate measurement of gas flow, has following beneficial effect:
1, is fit to the measurement of heterogeneity and different in flow rate flue gas.For noncorrosive gas, the influence that sampling volume is not changed by smoke components and flue gas flow can both accurately be measured.
2, improved the gas meter accuracy of measurement.With existing sample devices flow error by ± 5% bring up to ± 2% scope in.
Description of drawings
The structural representation of Fig. 1 measurement of gas flow device of the present utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described: referring to Fig. 1, the utility model has been introduced rotary encoder 1 in gasmetry, it is installed on the transmission shaft 13 of counting scale of dry type gas meter 2, the rotary encoder pin is partly distinguished extracting power supply cord 3,4 and is used for the power supply supply, draw data line 5,6 and be used for signal output, all leads all in counting scale capping 11 perforate 7 places draw.The data line 5,6 of drawing is connected respectively on 8,9 terminals of counter 10, carries out pulse detection and flow metering by counter.With silica gel counting scale capping 11 is resealed after the above-mentioned device installation.
During the transmission shaft rotation, code-wheel (12) rotates with speed with transmission shaft, the detecting unit of forming through electronic components such as photodiodes detects the some pulse signals of output, and the signal of its output is admitted to counter, and counter is according to the volume of the number metering gas of the output pulse of rotary encoder.
Dry type gas flow of the present utility model is counted common aluminum alloy shell gas meter, flow meter, can measure coal-fired flue-gas, rock gas, liquefied gas and all noncorrosive gases flows.Rotary encoder is incremental, rotates the output pulse by 512 line code-wheels, and is motionless or when having a power failure when scrambler, rely on the memory internal of counting equipment to remember the position, during incoming call work, scrambler can be proceeded pulse output, can not lose pulse, antijamming capability is strong.Impulse meter employing counting rate is fast, the ratio setting range is wide, band E
2The product of PROM automatic power cutoff protector function can make the resolution of gas sampling volume metering reach 1ml by the soap bubble flowmeter calibration.
Claims (1)
1. measurement of gas flow device, comprise dry type gas meter (2), be characterised in that, also comprise rotary encoder (1) sum counter (10), described rotary encoder comprises code-wheel (12) and detecting unit, described code-wheel (12) is fixed on the transmission shaft of dry type gas meter counting scale (13), detecting unit is for detection of the angular displacement of code-wheel, the pulse signal of its output is admitted to counter, and counter is according to the volume of the number metering gas of the output pulse of rotary encoder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320059827 CN203053507U (en) | 2013-02-01 | 2013-02-01 | Gas flow metering device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320059827 CN203053507U (en) | 2013-02-01 | 2013-02-01 | Gas flow metering device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203053507U true CN203053507U (en) | 2013-07-10 |
Family
ID=48736450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320059827 Expired - Fee Related CN203053507U (en) | 2013-02-01 | 2013-02-01 | Gas flow metering device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203053507U (en) |
-
2013
- 2013-02-01 CN CN 201320059827 patent/CN203053507U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130710 Termination date: 20140201 |