CN203798387U - Portable gas flow meter - Google Patents
Portable gas flow meter Download PDFInfo
- Publication number
- CN203798387U CN203798387U CN201420180251.8U CN201420180251U CN203798387U CN 203798387 U CN203798387 U CN 203798387U CN 201420180251 U CN201420180251 U CN 201420180251U CN 203798387 U CN203798387 U CN 203798387U
- Authority
- CN
- China
- Prior art keywords
- flow meter
- gas flow
- transducer
- portable gas
- pressure
- 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.)
- Expired - Fee Related
Links
- 238000003756 stirring Methods 0.000 abstract description 4
- 238000009530 blood pressure measurement Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
Abstract
The utility model provides a portable gas flow meter. The portable gas flow meter comprises a display circuit, a single-chip microcomputer unit, an alarm circuit, a pressure transducer, a pressure difference transducer, a temperature transducer and a valve body, wherein the single-chip microcomputer unit is connected with the display circuit, the alarm circuit, the pressure transducer, the pressure difference transducer and the temperature transducer respectively; the pressure transducer, the pressure difference transducer and the temperature transducer are connected with the valve body respectively. The portable gas flow meter has the characteristics of being reasonable in design, small in size, light in weight, clear in display, high in measuring accuracy, and safe and convenient to apply, can promptly and accurately reflect the operating condition of a gas stirring system, and has excellent application prospect.
Description
Technical field
The utility model is specifically related to a kind of Portable gas flow meter.
Background technology
Take that the differential pressure flowmeter that orifice plate, nozzle and Venturi tube be representative is simple in structure with it, highly versatile, the advantage such as cheap, once in industry, obtain application widely.Yet owing to there are some significant drawback in himself structure: as unstable in efflux coefficient, linear poor, easily contamination, crushing compared with large, range ratio is little, the straight tube that requires is long etc., so be difficult to be applied in the higher occasion of accuracy requirement.
Utility model content
The purpose of this utility model is for solving above-mentioned deficiency, and a kind of Portable gas flow meter is provided.
The purpose of this utility model is achieved through the following technical solutions:
A kind of Portable gas flow meter, comprise display circuit, single machine unit, warning circuit, pressure transducer, differential pressure pickup, temperature sensor and valve body, single machine unit is connected with display circuit, warning circuit, pressure transducer, differential pressure pickup and temperature sensor respectively, and pressure transducer, differential pressure pickup and temperature sensor are connected with valve body respectively.
The utility model also has some technical characterictics like this:
Described single machine unit adopts AT89C51 singlechip chip.
Described pressure transducer adopts SMI5502-030-A sensor chip.
Described differential pressure pickup adopts SMI5552-003-D sensor chip.
The utlity model has following useful effect:
The feature such as the utility model volume reasonable in design is little, lightweight, clear display, measuring accuracy are high, safe and convenient to use, can reflect the working condition of air agitation system in time, exactly, has good application prospect.
Accompanying drawing explanation
Fig. 1 is one-piece construction schematic diagram of the present utility model;
Fig. 2 is pressure measurement circuitry of the present utility model;
Fig. 3 is differential pressure measurement circuit of the present utility model;
Fig. 4 is A/D change-over circuit of the present utility model;
Fig. 5 is flow indication circuit of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described:
Embodiment 1
A kind of Portable gas flow meter, comprise display circuit 1, single machine unit 2, warning circuit 3, pressure transducer 4, differential pressure pickup 5, temperature sensor 6 and valve body 7, single machine unit 2 respectively with display circuit 1, warning circuit 3, pressure transducer 4, differential pressure pickup 5 is connected with temperature sensor 6, pressure transducer 4, differential pressure pickup 5 is connected with valve body 7 respectively with temperature sensor 6, described single machine unit 2 adopts AT89C51 singlechip chip, described pressure transducer adopts SMI5502-030-A sensor chip, described differential pressure pickup adopts SMI5552-003-D sensor chip.
Embodiment 2
Valve body designs and produces according to V-type cone flowmeter, flowing through stirring gas in valve body pressure and the pressure reduction at A, B place at A place is detected by pressure transducer and differential pressure pickup respectively, detection signal is delivered to AT89C51 single-chip microcomputer and is measured, compares and calculate, and utilizes temperature sensor to carry out temperature compensation; The flow value that stirs gas is shown by display circuit, and when stirring the flow value of gas over setting value, by warning circuit, carries out sound and light alarm.
Pressure transducer and differential pressure pickup are selected respectively SMI5502-030-A type and SMI5552-003-D type.SMI micro-pressure sensor chip adopts three-dimensional diaphragm structure, with silicon etching process, the stress (pressure) producing is concentrated on to sensing resistor place, still has very high sensitivity like this when keeping overall accuracy and the linearity.80% stress is delivered to the beam type region in diaphragm, and the stress that diaphragm is lost only has 20%.Except the residing surrounding of pressure drag device, all parts of diaphragm are attenuate all, thereby obtains the swelling structure of diaphragm.Because sensor looks like mechanical force amplifier, thereby be convenient to the stress of motion of membrane to concentrate on pressure drag device, the stress of increase has greatly improved signal output, and the relief on diaphragm is used as stop layer.The film of surrounding gets up device sealing effectively, so pressure can not move forward and backward.In addition, in the structure of device, ion implanted resistor forms pressure resistance type resistance bridge, and pit has reduced total vibrations quality of device.
Because the voltage signal of pressure transducer and differential pressure pickup generation is more weak, for guaranteeing the measuring accuracy of measured parameter, need with amplifier, small-signal be amplified to the level matching with A/D converter input voltage, then just can carry out A/D conversion.For this reason, in amplifying circuit, selected the operational amplifier of AD620 type.AD620 is a operational amplifier with extremely low offset voltage (maximum 50 μ V) and bias current, and temperature drift coefficient is less than 0.6 μ V/ ℃, only needs an outer meeting resistance just gain can be adjusted arbitrarily between 1～1000.
Display circuit is mainly comprised of darlington transistor array ULN2003,74HC164 and trinity LED charactron, AT89C51 single-chip microcomputer is first exported flow data and pulse signal and is delivered to the conversion that 74HC164 carries out serial input-parallel output, then parallel output signal is connected to trinity LED charactron, utilizes ULN2003 driving LED to carry out flow indication.
Claims (4)
1. a Portable gas flow meter, comprise display circuit, single machine unit, warning circuit, pressure transducer, differential pressure pickup, temperature sensor and valve body, it is characterized in that: single machine unit is connected with display circuit, warning circuit, pressure transducer, differential pressure pickup and temperature sensor respectively, pressure transducer, differential pressure pickup and temperature sensor are connected with valve body respectively.
2. a kind of Portable gas flow meter as claimed in claim 1, is characterized in that: described single machine unit adopts AT89C51 singlechip chip.
3. a kind of Portable gas flow meter as claimed in claim 1, is characterized in that: described pressure transducer adopts SMI5502-030-A sensor chip.
4. a kind of Portable gas flow meter as claimed in claim 1, is characterized in that: described differential pressure pickup adopts SMI5552-003-D sensor chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420180251.8U CN203798387U (en) | 2014-04-12 | 2014-04-12 | Portable gas flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420180251.8U CN203798387U (en) | 2014-04-12 | 2014-04-12 | Portable gas flow meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203798387U true CN203798387U (en) | 2014-08-27 |
Family
ID=51380592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420180251.8U Expired - Fee Related CN203798387U (en) | 2014-04-12 | 2014-04-12 | Portable gas flow meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203798387U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112816644A (en) * | 2020-12-31 | 2021-05-18 | 杭州谱育科技发展有限公司 | Device and method for detecting VOCs in water |
-
2014
- 2014-04-12 CN CN201420180251.8U patent/CN203798387U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112816644A (en) * | 2020-12-31 | 2021-05-18 | 杭州谱育科技发展有限公司 | Device and method for detecting VOCs in water |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103728463B (en) | Ultrasonic wind meter and measuring method | |
| CN109506727B (en) | Ultrasonic flow measurement method and low-power consumption ultrasonic flowmeter | |
| CN205002814U (en) | Ultrasonic wave gas flowmeter | |
| CN104459195B (en) | A kind of device and method for measuring ultralow flow rate of liquid | |
| CN203798387U (en) | Portable gas flow meter | |
| CN202974379U (en) | Temperature and liquid level integrated transmitter | |
| CN103206997B (en) | Gas Roots flow measuring device and flow correction method for same | |
| CN202522583U (en) | Resistance strain transducer type device for detecting current speed in pipeline | |
| CN202582616U (en) | Integrated intelligent Verabar flow meter | |
| CN203191005U (en) | Precession vortex flowmeter | |
| CN203688579U (en) | Anemometer | |
| CN106066406B (en) | Air flow rate sensor | |
| CN103063868B (en) | Device and method for measuring flow rate of fluid | |
| CN203385750U (en) | Ultrasonic wave anemorumbometer | |
| CN210719245U (en) | Multifunctional liquid detection device | |
| CN101191747A (en) | Thermal energy meter | |
| CN101191737A (en) | Tube flow gauge | |
| CN219799782U (en) | Flow velocity meter | |
| CN205580614U (en) | Integrated temperature sensor structure | |
| CN207004780U (en) | Extraction flow control system based on double absolute pressure methods in side stream type gasmetry | |
| CN208953036U (en) | Venturi flow sensor | |
| CN208751756U (en) | A kind of resistance strain gage pressure-measuring system based on Labview | |
| CN105737917A (en) | Non-contact water meter | |
| CN209945432U (en) | Positive and negative differential pressure flowmeter | |
| CN202182904U (en) | Differential pressure flow velocity sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140827 Termination date: 20150412 |
|
| EXPY | Termination of patent right or utility model |