CN107830902A - A kind of gas flowmeter - Google Patents
A kind of gas flowmeter Download PDFInfo
- Publication number
- CN107830902A CN107830902A CN201711321096.1A CN201711321096A CN107830902A CN 107830902 A CN107830902 A CN 107830902A CN 201711321096 A CN201711321096 A CN 201711321096A CN 107830902 A CN107830902 A CN 107830902A
- Authority
- CN
- China
- Prior art keywords
- flow
- nozzle
- pressure sensor
- temperature sensor
- export department
- 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.)
- Pending
Links
- 238000005259 measurement Methods 0.000 abstract description 28
- 230000002457 bidirectional effect Effects 0.000 abstract description 4
- 238000013461 design Methods 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 5
- 238000011144 upstream manufacturing Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 238000012369 In process control Methods 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000010965 in-process control Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
- G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
- G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
- G01F1/40—Details of construction of the flow constriction devices
- G01F1/42—Orifices or nozzles
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/86—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure
- G01F1/88—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure with differential-pressure measurement to determine the volume flow
Abstract
The invention discloses a kind of gas flowmeter, including nozzle, it includes the inlet portion sequentially connected, throat, export department, the circulation area of passage is minimum at the throat, the nozzle is axially symmetric structure, the inlet portion is provided with the first temperature sensor and first pressure sensor, the export department is provided with second temperature sensor and second pressure sensor, first temperature sensor is electrically connected with flow integrator, and the first pressure sensor, second temperature sensor and second pressure sensor electrically connect with flow integrator.The nozzle is horizontal direction and vertical direction is axisymmetric cylindrical structure.Volume flow that can be under direct measurement gas mass flow or standard state, have wide-range and can bidirectional measurement the advantages of, have the higher accuracy of measuring and stability.
Description
Technical field
The invention belongs to thermal technology's flow measurement technology field, and in particular to a kind of gas flowmeter.
Background technology
Flow is an important parameter in modern industrial production.Industrial processes, scientific experiment and gas for domestic use
Deng being related to flow measurement everywhere.Since 20th century, the technical field such as energy measurement, environmental protection, aerospace military
The demand of flow measurement is constantly expanded, this also causes flow measurement technology to be rapidly developed.Critical flow nozzle, differential pressure type stream
Gauge is respectively provided with good flow measurement stability, and clear principle, technology maturation, it is as gas measuring instrument or gas flow
Flow standard table in standard set-up and be used widely.
It is that flow measurement range is " 1 " that critical flow nozzle, which is primarily present problem, at present, i.e. the corresponding flow of a nozzle.
But the measurement of flow generally requires a limited scope.Realize that limited flow measurement range must use multiple nozzles
It is installed in parallel, otherwise can not meets to measure needs.In addition, the flow that current critical flow nozzle can only adapt to a flow direction is surveyed
Measure, sometimes for measurement pipeline bidirectional traffics in practical application in industry, therefore popularization and application are extremely limited.To adapt to industry
Specific demand in process control measurement, save manufacturing cost and simplify pipe-line system, invent a kind of wide-range, and measurable pipe
The flowmeter of the forward and reverse air-flow in road, by the cost for greatly improving industrial gasses flow measurement and simplify pipeline in experimental fluid mechanics
System, its invention are significant.
The content of the invention
, can direct measurement gas mass flow or standard state object of the present invention is to provide a kind of gas flowmeter
Under volume flow, have wide-range and can bidirectional measurement the advantages of, have the higher accuracy of measuring and stability.
For the above-mentioned purpose, major technique solution of the invention is to provide a kind of gas flowmeter, including nozzle, its
Include the inlet portion sequentially connected, throat, export department, the circulation area of passage is minimum at the throat, and the nozzle is axle
Symmetrical structure, the inlet portion are provided with the first temperature sensor and first pressure sensor, and the export department is provided with second temperature
Sensor and second pressure sensor, first temperature sensor are electrically connected with flow integrator, the first pressure sensing
Device, second temperature sensor and second pressure sensor electrically connect with flow integrator.
The nozzle is horizontal direction and vertical direction is axisymmetric cylindrical structure.
The inlet portion, the pipeline connection standard of export department perform corresponding Flange Standard and thread standard.
The sectional area of the laryngeal inlet is the 1/10-1/2 of the inlet portion channel cross-sectional area.
The first pressure sensor and second pressure sensor, it is respectively used to measure the pressure of the inlet portion and export department
Power.
First temperature sensor and second temperature sensor, it is respectively used to measure the temperature of the inlet portion and export department
Degree.
The passway of the inlet portion and export department is respectively connected with retainer ring, and the retainer ring is provided with multiple fixing holes.
Inventive flow measurement operation principle is, when gas forward direction flows through the present invention, the present invention substantially first passes through for one
The nozzle of the tapered rear expansion shape again of throat is crossed, if keeping the pressure P that nozzle entrance portion is upstream end1With temperature T1It is constant, make
Its export department is the pressure P of downstream2It is gradually reduced, then pass through the gas mass flow q of nozzlemTo gradually it increase；Work as downstream
Pressure P2When dropping to a certain pressure, maximum qmax is up to by the mass flow of nozzle.If continue to reduce downstream pressure
Power P2, will no longer be changed by the gas flow rate of nozzle throat, maintain velocity of sound, be not further added by by the flow of nozzle, now
Flow is referred to as critical flow.If upstream and downstream pressure differential does not reach critical flow condition, now flow measurement calculates model and presses differential pressure
Formula flowmeter, i.e., now flow and pressure difference into square root relationship.Flow measurement range so is expanded, can be real because of symmetric design
Existing reverse measuremenet.Temperature and pressure interface is integrated with, the flow integrator specially designed can meet Wide measuring range flow measuring.This hair
Bright internal gas runner meets critical flow nozzle design national standard, experiments verify that, obtains higher metering on this basis
The degree of accuracy and stability.
By GB/T 21188-2007《Gas flow is measured with critical flow venturi nozzle》Technical requirements, nozzle design ginseng
According to critical flow cylindrical nozzle associated technical parameters.Nozzle is calculated by designing, and determines runner physical dimension, machining meets the requirements
Afterwards, efflux coefficient and discharge coefficient are demarcated by gas flow standard experimental rig.Temperature, pressure sensor press design requirement,
Installed and used after measurement verification.Flow integrator sets efflux coefficient and discharge coefficient by design calculation specification requirement.
The beneficial effects of the invention are as follows：Volume flow that can be under direct measurement gas mass flow or standard state, has
Wide-range and can bidirectional measurement the advantages of, have the higher accuracy of measuring and stability.
Brief description of the drawings
Fig. 1 is the theory structure schematic diagram of one embodiment of the invention,
In figure：Nozzle 1, inlet portion 2, throat 3, export department 4, the first temperature sensor 5, first pressure sensor 6, second
Temperature sensor 7, second pressure sensor 8, flow integrator 9, retainer ring 10, fixing hole 11.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained, belong to what the present invention protected
Scope.
As shown in figure 1, a kind of gas flowmeter described by the present embodiment, including nozzle 1, it includes what is sequentially connected
Inlet portion 2, throat 3, export department 4, the circulation area of passage is minimum at the throat 3, and the nozzle 1 is axially symmetric structure, institute
State inlet portion 2 and be provided with the first temperature sensor 5 and first pressure sensor 6, the export department 4 is provided with second temperature sensor 7
With second pressure sensor 8, first temperature sensor 5 is electrically connected with flow integrator 9, the first pressure sensor 6,
Second temperature sensor 7 and second pressure sensor 8 electrically connect with flow integrator 9.
The nozzle 1 is horizontal direction and vertical direction is axisymmetric cylindrical structure.
The inlet portion 2, the pipeline connection standard of export department 4 perform corresponding Flange Standard and thread standard.
The sectional area of the passage of throat 3 is the 1/10-1/2 of the channel cross-sectional area of inlet portion 2.
The first pressure sensor 6 and second pressure sensor 8, it is respectively used to measure the inlet portion 2 and export department 4
Pressure.
First temperature sensor 5 and second temperature sensor 7, it is respectively used to measure the inlet portion 2 and export department 4
Temperature.
The passway of the inlet portion 2 and export department 4 is respectively connected with retainer ring 10, and the retainer ring 10 is provided with multiple solid
Determine hole 11.
Inventive flow measurement operation principle is, when gas forward direction flows through the present invention, the present invention substantially first passes through for one
The nozzle 1 of the tapered rear expansion shape again of throat 3 is crossed, if keeping the pressure P that the inlet portion 2 of nozzle 1 is upstream end1With temperature T1No
Become, make the pressure P of its i.e. downstream of export department 42It is gradually reduced, then pass through the gas mass flow q of nozzle 1mTo gradually it increase
Add；As downstream pressure P2When dropping to a certain pressure, maximum qmax is up to by the mass flow of nozzle 1.If continue
Reduce downstream pressure P2, will no longer be changed by the gas flow rate of the throat 3 of nozzle 1, maintain velocity of sound, by the flow of nozzle 1 not
It is further added by, flow now is referred to as critical flow.If upstream and downstream pressure differential does not reach critical flow condition, now flow measuring meter
Calculate model and press differential pressure flowmeter, i.e., now flow and pressure difference into square root relationship.Flow measurement range so is expanded, because right
Claim design, reverse measuremenet can be achieved.Temperature and pressure interface is integrated with, the flow integrator 9 specially designed can meet wide-range
Flow measurement.Internal gas runner of the present invention meet critical flow nozzle 1 design national standard, on this basis experiments verify that,
Obtain the higher accuracy of measuring and stability.
By GB/T 21188-2007《Gas flow is measured with critical flow venturi nozzle 1》Technical requirements, nozzle 1 design
With reference to the associated technical parameters of critical flow cylindrical nozzle 1.Nozzle 1 is calculated by designing, and determines runner physical dimension, machining meets
After it is required that, efflux coefficient and discharge coefficient are demarcated by gas flow standard experimental rig.Temperature, pressure sensor will by design
Ask, installed and used after measurement verification.Flow integrator 9 sets efflux coefficient and flow system by design calculation specification requirement
Number.
The present invention can be under direct measurement gas mass flow or standard state volume flow, there is wide-range and can be two-way
The advantages of measurement, there are the higher accuracy of measuring and stability.
The present invention is not limited to above-mentioned preferred forms, and anyone can show that other are various under the enlightenment of the present invention
The product of form, however, make any change in its shape or structure, it is every that there is skill identical or similar to the present application
Art scheme, is within the scope of the present invention.
Claims (3)
1. a kind of gas flowmeter, including nozzle (1), it includes the inlet portion (2) sequentially connected, throat (3), export department
(4), the circulation area of throat (3) place passage is minimum, it is characterised in that the nozzle (1) is axially symmetric structure, it is described enter
Oral area (2) is provided with the first temperature sensor (5) and first pressure sensor (6), and the export department (4) senses provided with second temperature
Device (7) and second pressure sensor (8), first temperature sensor (5) are electrically connected with flow integrator (9), and described first
Pressure sensor (6), second temperature sensor (7) and second pressure sensor (8) electrically connect with flow integrator (9).
2. gas flowmeter according to claim 1, it is characterised in that the nozzle (1) is horizontal direction and vertical direction
It is axisymmetric cylindrical structure.
3. gas flowmeter according to claim 1, it is characterised in that the passage of the inlet portion (2) and export department (4)
Mouth is respectively connected with retainer ring (10), and the retainer ring (10) is provided with multiple fixing holes (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711321096.1A CN107830902A (en) | 2017-12-12 | 2017-12-12 | A kind of gas flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711321096.1A CN107830902A (en) | 2017-12-12 | 2017-12-12 | A kind of gas flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107830902A true CN107830902A (en) | 2018-03-23 |
Family
ID=61643019
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711321096.1A Pending CN107830902A (en) | 2017-12-12 | 2017-12-12 | A kind of gas flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107830902A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023115923A1 (en) * | 2021-12-24 | 2023-06-29 | 广州蓝仕威克医疗科技有限公司 | High-measurement-precision differential pressure flowmeter capable of being repeatedly sterilized |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5199306A (en) * | 1990-11-16 | 1993-04-06 | Hunter Robert M | Method and apparatus for metering flow in closed conduits that surcharge |
| US20020189369A1 (en) * | 2001-05-11 | 2002-12-19 | Lewis Gary W. | Venturi flowmeter for use in an exhaust sampling apparatus |
| WO2005040732A1 (en) * | 2003-10-27 | 2005-05-06 | Elster-Instromet Ultrasonics B.V. | Wet gas measurement apparatus and method |
| US20090326839A1 (en) * | 2008-06-27 | 2009-12-31 | Steven Bruce Rogers | Velocity-enhanced flow measurement |
| CN103292849A (en) * | 2013-03-25 | 2013-09-11 | 兰州海默科技股份有限公司 | Device and method for online measurement of gas-phase flux and liquid-phase flux of moisture in horizontal pipe |
| CN105675070A (en) * | 2016-03-28 | 2016-06-15 | 中国海洋石油总公司 | Irregular Venturi flowmeter and method for measuring gas-liquid phase flow in multiphase flow by utilization of irregular Venturi flowmeter |
| CN106441468A (en) * | 2016-09-18 | 2017-02-22 | 中国核动力研究设计院 | Venturi flow meter for bidirectional flow measurement and measurement method thereof |
| CN207515853U (en) * | 2017-12-12 | 2018-06-19 | 杭州天马计量科技有限公司 | A kind of gas flowmeter |
-
2017
- 2017-12-12 CN CN201711321096.1A patent/CN107830902A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5199306A (en) * | 1990-11-16 | 1993-04-06 | Hunter Robert M | Method and apparatus for metering flow in closed conduits that surcharge |
| US20020189369A1 (en) * | 2001-05-11 | 2002-12-19 | Lewis Gary W. | Venturi flowmeter for use in an exhaust sampling apparatus |
| WO2005040732A1 (en) * | 2003-10-27 | 2005-05-06 | Elster-Instromet Ultrasonics B.V. | Wet gas measurement apparatus and method |
| US20090326839A1 (en) * | 2008-06-27 | 2009-12-31 | Steven Bruce Rogers | Velocity-enhanced flow measurement |
| CN103292849A (en) * | 2013-03-25 | 2013-09-11 | 兰州海默科技股份有限公司 | Device and method for online measurement of gas-phase flux and liquid-phase flux of moisture in horizontal pipe |
| CN105675070A (en) * | 2016-03-28 | 2016-06-15 | 中国海洋石油总公司 | Irregular Venturi flowmeter and method for measuring gas-liquid phase flow in multiphase flow by utilization of irregular Venturi flowmeter |
| CN106441468A (en) * | 2016-09-18 | 2017-02-22 | 中国核动力研究设计院 | Venturi flow meter for bidirectional flow measurement and measurement method thereof |
| CN207515853U (en) * | 2017-12-12 | 2018-06-19 | 杭州天马计量科技有限公司 | A kind of gas flowmeter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023115923A1 (en) * | 2021-12-24 | 2023-06-29 | 广州蓝仕威克医疗科技有限公司 | High-measurement-precision differential pressure flowmeter capable of being repeatedly sterilized |
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