CN102538886A - Extra-pipe binding type thermal pulse gas flowmeter capable of resisting ambient temperature disturbances - Google Patents
Extra-pipe binding type thermal pulse gas flowmeter capable of resisting ambient temperature disturbances Download PDFInfo
- Publication number
- CN102538886A CN102538886A CN2012100031871A CN201210003187A CN102538886A CN 102538886 A CN102538886 A CN 102538886A CN 2012100031871 A CN2012100031871 A CN 2012100031871A CN 201210003187 A CN201210003187 A CN 201210003187A CN 102538886 A CN102538886 A CN 102538886A
- Authority
- CN
- China
- Prior art keywords
- pipeline
- temperature
- heater
- heat
- extra
- 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.)
- Granted
Links
- 230000003044 adaptive effect Effects 0.000 claims abstract description 7
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 5
- 238000005057 refrigeration Methods 0.000 claims description 3
- 238000012937 correction Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 21
- 238000000034 method Methods 0.000 abstract description 4
- 230000000191 radiation effect Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 5
- 239000004519 grease Substances 0.000 description 4
- 229920001296 polysiloxane Polymers 0.000 description 4
- 238000009776 industrial production Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Landscapes
- Measuring Volume Flow (AREA)
- Details Of Flowmeters (AREA)
Abstract
The invention belongs to the field of flow measurement of a compressed air system and realizes an extra-pipe binding type thermal pulse gas flowmeter capable of resisting ambient temperature disturbances. The invention mainly relates to a method and a corresponding device for measuring gas flow in a pipeline by using a periodically variable temperature field generated outside a pipeline according to the relationship between the variable quantity of the temperature field under the influence of gas flow heat transfer and the gas flow. According to the invention, an adaptive pulse heater arranged on the outer wall of a gas pipeline is used for generating the periodically variable temperature field, heat signals are axially transmitted along the pipeline and mainly influenced by the heat radiation effect of gas flowing in the pipeline, a relative dynamic mean value is calculated according a temperature trend of measurements points on the outer wall of the pipeline at the upstream of the heater, and the flow rate can be measured because the relative dynamic mean value is in direct ratio to the flow rate. According to the invention, an extra-pipe binding type mounting manner is adopted, the assembly and disassembly are convenient, a variable temperature field measurement is adopted, the temperature disturbances of outside environment can be effectively inhibited, and the flowmeter consumes less time during measurement and is accurate and reliable.
Description
Technical Field
The invention belongs to the field of flow measurement of compressed air systems, and relates to an extra-pipe bundled heat pulse gas flowmeter capable of resisting ambient temperature interference.
Background
The gas is used as a form of energy existence or a carrier of energy, and the application in industry is more and more extensive, and in the field of compressor systems, the gas flow is an important parameter in the system, the measurement of the gas flow is a key technology, and the gas flow meter is widely used in many industrial production occasions.
The most of the flowmeters used for measuring gas flow in the market are intrusive devices, such as a thermal flowmeter, a differential pressure flowmeter, a target flowmeter and the like, need to be connected into a pipeline in series, are complex in operation, influence industrial production during installation, interfere flow, have the problems of pressure loss, probe fouling and the like. The non-intervention measurement technology can avoid the defects of flow measurement without disassembling the original pipeline, and can also realize the advantages of multi-point measurement and the like. However, the existing equipment, such as ultrasonic equipment, is expensive and has poor reliability, and the practicability of the existing equipment can not meet the industrial field requirements. Therefore, the non-invasive measurement technology of the gas is difficult, and no mature technology and product exist at present. The research and development of the technology have great significance for industrial development and economic and energy conservation.
The invention provides an extra-pipe binding type heat pulse gas flowmeter capable of resisting ambient temperature interference. In addition, the variable temperature field measuring mode can effectively inhibit the temperature interference of the external environment, and the high-efficiency self-adaptive pulse heater and the heat insulation cover are matched, so that the measuring time is short, the measuring result is accurate and reliable, and the measuring requirement of the industrial field on the pipeline gas flow is met. In addition, due to the low hardware cost, the method can be applied to industrial sites in a large scale, realizes multi-point detection, is beneficial to monitoring of industrial production, and achieves the purposes of optimizing production, saving energy and reducing emission.
Disclosure of Invention
Objects of the invention: the gas flow measuring device is applied to flow measurement of industrial gas pipelines, and is convenient to install, simple to operate, reliable in measurement and low in cost.
The technical scheme of the invention is as follows:
the method for measuring the gas flow by utilizing the characteristics of the periodically-changed temperature field of the pipeline has the following measurement principle:
a) according to the pipeline needing flow measurement, a proper measuring point is selected, and the surface of the pipeline is simply cleaned. The heating surface of the instrument is tightly attached to the surface to be measured and fixed by a matched binding belt. Electrifying the instrument, and setting the period of the heating pulse according to the diameter of the measured pipelineTIn order to make the inner wall of the pipe sufficiently thick, the period of the heating pulse cannot be too short, and the value of the period is obtained by the following formula:
wherein,kis the gain factor for the gain factor to be,Cis the specific heat capacity of the pipe material,ρis the density of the material of the pipe,lis the thermal conductivity of the material of the pipe,dis the nominal diameter of the pipe.
The instrument automatically searches the standard data of the industrial pipeline stored in the database according to the input diameter data of the pipeline, and finds out the specific heat capacity, the density and the heat conductivity of the corresponding pipeline material. The gain factor is automatically given by the controller as a reference value which determines the time taken for the measurement and the accuracy of the measurement, the smaller the value the faster the measurement and the less accurate and vice versa. The user can set the reference value by himself.
b) During measurement, a processor (6) sends a heating electric signal to a driving circuit (4), a heat flow valve (14) is driven to work for a heating station, a heater (11) works, a water-cooled refrigerator (13) unloads, heat is conducted to the outer wall (1) of the pipeline from the heater (11), and the pipeline is heated; then, the processor (6) sends a refrigeration electric signal to the driving circuit (4), the heat-exchange switching valve (14) is used for refrigerating stations, the heater (11) is unloaded, the water-cooled refrigerator (13) works, heat is conducted to the heater (11) from the outer wall (1) of the pipeline, and the pipeline is cooled. Thus, repeating the above operation achieves the generation of a continuous heat pulse (i.e., a periodically varying temperature field) propagating in the axial direction of the pipe.
c) A temperature sensor (8) located at a point upstream of the adaptive pulse heater (2) measures the temperature and transmits the measured data to the processor (6) via an A/D converter (7).
Based on the measured values, one section of temperature signal curve is selected as an effective section, the effective section comprises three temperature change periods, the temperature trend (17) reflecting the temperature field characteristics can be obtained by performing linear fitting on the effective section curve, and the relative dynamic mean value is calculatedf，
Wherein:Athe average value of the dynamic state is taken as the dynamic average value,A 0 the reference value is a gas flow rate of 0.A b Is a temperature trend reference value (18),A a increasing the value (19) for the temperature trend according to the flow rate andfin the context of (a) or (b),
and then calculating the flow Q of the measured object, whereinbIs a flow correction coefficient that corrects for the offset due to the selection of different temperature signal measurement segments.
THE ADVANTAGES OF THE PRESENT INVENTION：
The invention provides an extra-pipe binding type heat pulse gas flowmeter capable of resisting ambient temperature interference aiming at the problem of gas flow measurement in industrial field, which is used as an extra-pipe measuring means and is different from the traditional measuring means by the following maximum difference: the flowmeter does not need to be connected into a pipeline, so that all problems caused by direct contact of the existing series-type instrument with fluid are avoided; the periodic change of the temperature field is fully utilized, the interference of the environmental temperature is inhibited, and the corresponding flow data is solved in a short time according to the characteristics of the temperature field; convenient operation, the hardware is with low costs, and the installation is dismantled conveniently.
Drawings
Fig. 1 is a diagrammatic view of a flow instrument according to the present invention.
1, a pipeline to be detected; 2-adaptive pulse heaters; 3, a heat shield;
4-a drive circuit; 5-a display panel; 6, a processor;
7-a/D converter; 8-a temperature sensor;
FIG. 2 is a schematic diagram of an adaptive pulse heater according to the present invention
9-outer wall of the detected pipeline; 10-internal heat-conducting silicone grease; 11-a heater;
12-a flexible mechanism; 13-water-cooled refrigerator; 14-a hot-flow valve;
15-external heat-conducting silicone grease;
fig. 3 is a simplified illustration of the parameters of the temperature signal (three cycles) referred to in the present invention:
16-actual measured temperature-time signal; 17-temperature fitting trend;
18-a temperature trend reference value; 19-temperature trend increase value;
Detailed Description
The present invention is further described below.
1. Adaptive pulse heater (2), characterized by:
mainly comprises a hot-flow valve (14), a heater (11) and a water-cooled refrigerator (13). The hot flow valve (14) is mainly composed of Peltier semiconductor elements, the heater (11) is a ceramic heater assembly, and a refrigerating water pipe of the water-cooled refrigerator (4) is inserted in the inner heat-conducting silicone grease (10). The adaptive pulse heater may generate a periodically varying thermal signal as desired. In order to enhance the attaching degree, the lower end of the hot-flow valve (14) as a heating surface is provided with an outer heat-conducting silicone grease (15) as a coating.
2. A temperature sensor (8), characterized in that:
consists of a platinum thermistor and is arranged at the upstream end of the adaptive pulse heater (2), and the relative dynamic mean value of the heater is in direct proportion to the flow.
3. A controller, characterized by:
the controller is composed of a drive circuit (4), a processor (6), a display panel (5), and an A/D converter (7). After the instrument is powered on, the diameter of a measured pipeline is input, a heating period is set (the instrument provides a preset value), then measurement is started, a processor (6) sends an electric signal to a driving circuit (4), a heat flow valve (14), a heater (11) and a water-cooled refrigerator (13) are driven to work, a heat signal with periodic change is generated, then a temperature sensor (8) measures the outer side of the pipeline wall, a temperature field is influenced by air flow, measured data are transmitted to the processor (6) through an A/D converter (7), flow is resolved finally, and a measuring process and a calculation result are displayed on a display panel (5).
Claims (3)
1. An outside of tubes bundling heat pulse gas flowmeter that can anti ambient temperature disturbed which characterized in that: an adaptive pulse heater (2) attached to the outer wall of the pipeline with a period
On both sides of the heater, generating a periodically varying temperature field, whereinCIs the specific heat capacity of the pipeline material,ρIs density、lIs the heat conductivity,dIs the nominal diameter; taking one point at the upstream of the heater as a measuring point, performing linear fitting on a curve of the temperature of the measuring point changing along with time, defining the obtained line segment as a temperature trend, and defining the temperature value at the starting point of the temperature trend as a reference value of the temperature trendA b The difference between the temperature value at the end point of the temperature trend and the starting point is defined as the increasing value of the temperature trendA a Gas flow and relative dynamic mean
In an increasing relationship, wherein
The correction value considering the fitting error; and a temperature sensor positioned at the upstream section of the heater measures the temperature of the outer wall of the pipeline, calculates a relative dynamic mean value, and finally calculates the corresponding flow according to the increasing relation.
2. The bundled outside of tubes thermal pulse gas flowmeter of claim 1, wherein: the flexible mechanism (12) automatically adjusts the radian of the binding surface (heating surface) of the heater according to the shapes of pipelines with different pipe diameters, so that the heat flow valve (14) is tightly attached to the outer wall of the pipeline, and the sufficient heat transfer is ensured.
3. The bundled outside of tubes thermal pulse gas flowmeter of claim 1, wherein: a processor (6) sends a heating electric signal to a driving circuit (4), a heat flow valve (14) is driven to a heating station, a water-cooled refrigerator (13) unloads the heat flow valve, and a linear array type heater (11) heats the pipeline by taking the axial direction of the pipeline as a heat transfer direction; then, the processor (6) sends a refrigeration electric signal to the driving circuit (4), the heat exchange flow valve (14) is switched to a refrigeration station, the heater (11) is unloaded at the same time, and the water-cooled refrigerator (13) cools the pipeline, so that a cycle is formed, and the operation is repeated to realize the generation of a temperature field which changes periodically.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100031871A CN102538886B (en) | 2012-01-07 | 2012-01-07 | Extra-pipe binding type thermal pulse gas flowmeter capable of resisting ambient temperature disturbances |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100031871A CN102538886B (en) | 2012-01-07 | 2012-01-07 | Extra-pipe binding type thermal pulse gas flowmeter capable of resisting ambient temperature disturbances |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102538886A true CN102538886A (en) | 2012-07-04 |
| CN102538886B CN102538886B (en) | 2013-11-27 |
Family
ID=46346357
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100031871A Expired - Fee Related CN102538886B (en) | 2012-01-07 | 2012-01-07 | Extra-pipe binding type thermal pulse gas flowmeter capable of resisting ambient temperature disturbances |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102538886B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104913823A (en) * | 2015-06-09 | 2015-09-16 | 合肥晶弘电器有限公司 | Quality and flow testing system and method of refrigerating system |
| CN106768111A (en) * | 2016-12-05 | 2017-05-31 | 中国计量大学 | A kind of novel flow rate measuring method based on gas correlation flowmeters |
| CN110926556A (en) * | 2019-12-06 | 2020-03-27 | 杭州朗沛科技有限公司 | Water flow metering method and device |
| CN116413310A (en) * | 2023-06-12 | 2023-07-11 | 深圳大学 | Test device and method for measuring heat conductivity coefficient under dynamic temperature condition |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1587922A (en) * | 2004-09-17 | 2005-03-02 | 浙江大学 | Heat measuring type mass flow detecting method based on secondary temperature differential principle |
| CN1603762A (en) * | 2004-10-29 | 2005-04-06 | 浙江大学 | Heat pulse time difference type flow detection method |
| CN1749717A (en) * | 2004-09-16 | 2006-03-22 | 重庆大学 | Method for detecting fluid flow and fluid heat quantity by thermal flow and its application device |
| WO2006065911A1 (en) * | 2004-12-17 | 2006-06-22 | Mks Instruments, Inc. | Pulsed mass flow measurement system and method |
| CN102128654A (en) * | 2011-01-18 | 2011-07-20 | 蔡茂林 | Non-intrusive flow measuring device for industrial gas pipeline |
-
2012
- 2012-01-07 CN CN2012100031871A patent/CN102538886B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1749717A (en) * | 2004-09-16 | 2006-03-22 | 重庆大学 | Method for detecting fluid flow and fluid heat quantity by thermal flow and its application device |
| CN1587922A (en) * | 2004-09-17 | 2005-03-02 | 浙江大学 | Heat measuring type mass flow detecting method based on secondary temperature differential principle |
| CN1603762A (en) * | 2004-10-29 | 2005-04-06 | 浙江大学 | Heat pulse time difference type flow detection method |
| WO2006065911A1 (en) * | 2004-12-17 | 2006-06-22 | Mks Instruments, Inc. | Pulsed mass flow measurement system and method |
| CN102128654A (en) * | 2011-01-18 | 2011-07-20 | 蔡茂林 | Non-intrusive flow measuring device for industrial gas pipeline |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104913823A (en) * | 2015-06-09 | 2015-09-16 | 合肥晶弘电器有限公司 | Quality and flow testing system and method of refrigerating system |
| CN104913823B (en) * | 2015-06-09 | 2018-11-06 | 合肥晶弘电器有限公司 | A kind of refrigeration system mass-flow measurement system and test method |
| CN106768111A (en) * | 2016-12-05 | 2017-05-31 | 中国计量大学 | A kind of novel flow rate measuring method based on gas correlation flowmeters |
| CN110926556A (en) * | 2019-12-06 | 2020-03-27 | 杭州朗沛科技有限公司 | Water flow metering method and device |
| CN116413310A (en) * | 2023-06-12 | 2023-07-11 | 深圳大学 | Test device and method for measuring heat conductivity coefficient under dynamic temperature condition |
| CN116413310B (en) * | 2023-06-12 | 2023-08-22 | 深圳大学 | Test device and method for measuring heat conductivity coefficient under dynamic temperature condition |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102538886B (en) | 2013-11-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106441520B (en) | Small-caliber ultrasonic water meter precision calibration method and calibration system thereof | |
| CN201673133U (en) | Heat transfer coefficient detector of building retaining structure | |
| US20120279316A1 (en) | Method and Apparatus for the Measurement of Flow in Gas or Oil Pipes | |
| CN102538886A (en) | Extra-pipe binding type thermal pulse gas flowmeter capable of resisting ambient temperature disturbances | |
| CN105371909A (en) | Novel micro-flow heat-distributed mass flow meter based on stabilized power source | |
| CN112345582B (en) | Method for testing performance parameters of semiconductor refrigeration sheet | |
| CN102221424A (en) | Calorimeter signal acquisition device, calorimeters and method for computing heating load | |
| CN106769814B (en) | Low-temperature corrosion detection system and detection method thereof | |
| CN200996922Y (en) | Antifouling performance evaluating experimental device | |
| CN202693053U (en) | Bundled thermal pulse gas flowmeter outside pipeline and capable of resisting interference of ambient temperature | |
| CN102110387B (en) | Teaching experimental device for measuring convective heat-transfer coefficient of micro-pipe | |
| CN105004399B (en) | Specific heat liquid level gauge | |
| CN207750645U (en) | Intelligent numerical control pipeline oil heater | |
| CN105572168A (en) | Thermal type steam dryness meter | |
| CN204807492U (en) | Solution -air heat exchanger coefficient of heat transfer surveys device | |
| CN202420579U (en) | Flow meter assistant based on non-intervention thermal dynamic measuring principle | |
| CN105424114A (en) | Novel micro-flow heat distributed mass flow meter | |
| CN205228682U (en) | Ultrasonic wave calorimeter based on pressure gauge | |
| CN214042131U (en) | Motor test water cooling and temperature control system | |
| CN102128654B (en) | Non-intrusive flow measuring device for industrial gas pipeline | |
| US20130255908A1 (en) | Energy measurement system for fluid systems | |
| CN204389270U (en) | Intelligent temperature control sample air cooling device | |
| CN112433548A (en) | Motor test water cooling and temperature control system | |
| WO2015125277A1 (en) | Gas flow-rate measurement system, gas flow-rate measurement method, and gas flow-rate measurement program | |
| CN206787740U (en) | A kind of two-channel body for ultrasonic calorimeter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C53 | Correction of patent of invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Fan Zichuan Inventor after: Cai Maolin Inventor before: Fan Zichuan |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: FAN ZICHUAN TO: FAN ZICHUAN CAI MAOLIN |
|
| ASS | Succession or assignment of patent right |
Owner name: BEIHANG UNIVERSITY Free format text: FORMER OWNER: CAI MAOLIN Effective date: 20130417 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20130417 Address after: 100191 Haidian District, Xueyuan Road, No. 37, Applicant after: BEIHANG University Address before: 100191 Haidian District, Xueyuan Road, No. 37, Applicant before: Cai Maolin |
|
| 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: 20131127 Termination date: 20220107 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |