CN201748942U - Heat distribution type gas mass flow meter - Google Patents
Heat distribution type gas mass flow meter Download PDFInfo
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- CN201748942U CN201748942U CN2010202824075U CN201020282407U CN201748942U CN 201748942 U CN201748942 U CN 201748942U CN 2010202824075 U CN2010202824075 U CN 2010202824075U CN 201020282407 U CN201020282407 U CN 201020282407U CN 201748942 U CN201748942 U CN 201748942U
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- 238000009826 distribution Methods 0.000 title claims abstract description 35
- 230000008602 contraction Effects 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 8
- 238000013461 design Methods 0.000 abstract description 6
- 238000012545 processing Methods 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 abstract description 2
- 238000009434 installation Methods 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract 1
- 238000005259 measurement Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 210000005239 tubule Anatomy 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The utility model discloses a gas mass flow meter. Through aiming at the defects that the gas mass flow meter in the prior art has higher requirements on the gas flow stability, the additional installation of a rectifier is generally needed at the front end of a pipeline in practical application, and in addition, the technical scheme is also not clear, the utility model provides a heat distribution type gas mass flow meter. A gas path pipeline of the gas mass flow meter is divided into a main pipeline and a flow division pipeline, and a Veturi measuring tube is placed in the flow division pipeline. On the basis, the utility model also optimizes the product design in two aspects: the design parameter of the Veturi measuring tube and gas flow distribution device addition. The heat distribution type gas mass flow meter provided by the utility model has the advantages that the hole diameter of a metering pipe is enlarged, blockage can not easily occur, the range of the meter is expanded, high-flow-rate gas flows can be measured, the measuring precision is high, the effect is good, and a detection sensor can be protected. In addition, the product structure is simple, the processing can be convenient, and the application range is wide.
Description
Technical field
The utility model relates to a kind of mass flowmeter, particularly relates to a kind of heat distribution formula mass-flow gas meter, belongs to flow meter field in the pipeline.
Background technology
Thermal type gas quality flow meter is the gas temperature a kind of flow instrument that the required energy of a certain value and the relation between the gaseous mass come the measurement gas quality that rises when utilizing heating, it is little to have crushing, the flow range degree is big, high precision, high duplication, high reliability, characteristics such as volume is little, and easy care is not fragile.
Heat distribution formula mass-flow gas meter is a kind of of thermal type gas quality flow meter.Heat distribution formula mass-flow gas meter in the market is divided into tubule type or capillary type and small-sized two big classes by the measuring tube internal diameter, and both structurally have bigger difference.Tubule type measuring tube internal diameter is 0.2～0.5mm only, and big slightly person is 0.8～1mm, and as easy as rolling off a log obstruction only is applicable to purify dustless gas.Small-sized measuring tube instrument has only straight pipe type, and internal diameter is 4mm.Because the restriction of internal diameter, this two classes mass flowmeter shows two big defectives at least: one, little, the easy obstruction of measuring tube internal diameter; Two, instrument range is limited.
The patent No. is ZL200820191642.4, and Granted publication number is CN201307027Y, and the Chinese utility model patent that name is called " thermal mass flow meter " discloses a kind of thermal mass flow meter.This mass flowmeter comprises measuring tube, sensor mounting rod and sensor.Wherein measuring tube can adopt Venturi meter, and sensor is installed in sensor mounting rod lower end and is deep in the measuring tube.This mass flowmeter has only illustrated that measuring tube can adopt Venturi meter, but does not provide the design parameter of Venturi meter, so this technical scheme and unclear, can not show the effect of this mass flowmeter.Simultaneously, the measuring tube of the disclosed mass flowmeter of this utility model patent is mounted in the trunk line of measured gas, is the direct measurement that trunk line gas is carried out.The mass flowmeter that this class is measured trunk line gas requires than higher airflow stability, because of face usually need be at the additional rectifier of installing of pipeline front end with steady air flow in practice, and the corresponding small product size that increased.
The utility model content
The purpose of this utility model is exactly at the deficiencies in the prior art, provides a kind of measuring tube aperture to enlarge, be difficult for blocking, and instrument range is expanded, can be measured big flow, and the high effective heat distribution formula mass-flow gas meter of measuring accuracy.This mass flowmeter is simple in structure, be convenient to install and use and easy to process.
For achieving the above object, the technical solution of the utility model is as follows:
A kind of heat distribution formula mass-flow gas meter, the seal and necessary connector that comprise gauge outfit, detecting sensor, Venturi meter, gas path pipe, necessity, it is characterized in that: described gas path pipe is divided into trunk line and shunt conduit, and described Venturi meter is positioned at shunt conduit.
Above-mentioned mass flowmeter has increased flow dividing structure and has become bypass type heat distribution formula mass flowmeter on existing thermal mass flow meter, by measure the trunk line branch road be on the shunt conduit very the gas flow of fraction just can draw gas flow on the trunk line.Such bypass type mass flowmeter can make air-flow effectively settle out and measure, and the utilization of shunting principle simultaneously also can reach the purpose of expansion instrument range.Particularly, by in mass flowmeter, increasing flow dividing structure, reached and to have guaranteed that again the linearity is to obtain the high measurement effect and the technique effect of precision by the big flow of measurement gas.
Above-mentioned mass flowmeter also can be optimized Venturi meter, is beneficial to air-flow and steadily obtains accurate flow matter by detecting sensor.Specifically can comprise three aspects: one, circular cone contraction section tapering before and after the Venturi meter is controlled in 7～15 ° of scopes, and can be further designed to the anterior circular cone contraction section of Venturi meter tapering be 8～10 °, and rear portion circular cone contraction section tapering is 12～14 °.Like this, rectification effect is better to airflow influence is littler for measuring tube.Two, the Venturi meter throat diameter is extended to more than the 5mm.In case solved traditional thermal mass flow sensors measuring tube diameter like this greater than 4mm, with regard to the technical matters of accurately measuring because not obtaining a stable thermal equilibrium value.According in the real work to the use situation of mass flowmeter, the Venturi meter throat diameter can design in 5～15mm scope.Three, the Venturi meter diameter is than designing in 0.6～0.7 scope.
Above-mentioned mass flowmeter also can increase flow distributor more effectively to improve accuracy of detection.Flow distributor comprises throttling orifice plate and distribution of air flow cover.Throttling orifice plate is an AND DEWATERING FOR ORIFICE STRUCTURE, is installed in the air inlet/outlet place of shunt conduit, and its effect is that preliminary the filtration enters the gas of shunt conduit, stops that bigger particle enters shunt body damage check sensor; The screen-aperture scope of throttling orifice plate is 1/3～1/5 of a Venturi tube throat diameter.The throttling orifice plate design thickness is little, can stop the particle dregs to reach, and is not easy to form dirt deposition again.The distribution of air flow cover is horn-like pipe fitting, and its loudspeaker opening direction is opposite with the loudspeaker opening direction of Venturi tube; The distribution of air flow cover is installed in the two ends of Venturi meter, and is enclosed within the Venturi meter loudspeaker section outside respectively.The effect of distribution of air flow cover is not directly rushed in pipeline after being to make the air-flow of vertical disorder to enter shunt conduit, thereby but forms straight air-flow and reach through detecting sensor reposefully and improve the purpose that detects effect.Flow distributor can reduce the measuring error that the trunk line air pulsing brings to greatest extent, and stops that the bulky grain foreign matter enters shunt conduit and damages detecting sensor.
Compared with prior art, the beneficial effects of the utility model are: (1) has expanded instrument range on the one hand by increase flow dividing structure in heat distribution formula mass flowmeter, the problems such as installation, sealing of the sensor on being responsible for have been simplified on the other hand, the periodic maintenance that makes measurement instrument and cleaning be more convenient, and make the conveying of gas on the trunk line not be subjected to the periodic maintenance of measurement instrument and the influence of cleaning.Smoothness when (2) having improved by the optimal design to Venturi meter that air communication is crossed detecting sensor makes measurement result more accurate, has reduced measuring tube simultaneously and has stopped up probability, has enlarged the instrument scope of application.(3) both reduce the measuring error that the trunk line air pulsing brings to greatest extent by increasing flow distributor, and can stop that again the bulky grain foreign matter entered shunt conduit, protected detecting sensor.(4) this product structure is simple, is convenient to processing, utilizes the standard machinery process equipment to carry out processing to pipe section, flow distributor, and the gauge outfit shell adopts the mold production technology to make in batches; Cooperate electronic circuit can make the bypass type mass-flow gas meter of portable or direct current supply.This product can be widely used in the industry that electronics, chemical industry, medicine etc. have gas dosing.
Description of drawings
Fig. 1 is the basic structure synoptic diagram of the heat distribution formula mass-flow gas meter of embodiment one.
Fig. 2 is the partial enlarged drawing of Fig. 1
Fig. 3 is the basic structure synoptic diagram of the heat distribution formula mass-flow gas meter of embodiment two.
Fig. 4 is the partial enlarged drawing of Fig. 3.
Fig. 5 is a distribution of air flow nested structure vertical profile synoptic diagram.
Number in the figure is as follows:
1 gauge outfit, 42 shunt conduit
2 detecting sensors, 51 throttling orifice plates
3 Venturi meters, 52 distribution of air flow covers
31 Venturi meter throats, 6 technology screw plugs
41 trunk lines, 7 choked flow pieces
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present utility model is further described.
Embodiment one
As shown in Figure 1 and Figure 2, make a kind of heat distribution formula mass-flow gas meter.
Fig. 1 is a heat distribution formula mass-flow gas meter basic structure synoptic diagram, and Fig. 2 is the partial enlarged drawing of Fig. 1.Mass flowmeter comprises the seal and the necessary connector of gauge outfit 1, detecting sensor 2, Venturi meter 3, trunk line 41, shunt conduit 42, necessity.Venturi meter 3 is installed in the shunt conduit 42, and there is technology screw plug 6 termination, two outsides.Detecting sensor 2 is potted in shunt conduit 42 by epoxy resin, and extend into Venturi meter throat 31.Gauge outfit 1 is installed in the draw-in groove on shunt conduit 42 tops, and is installed in together on the trunk line 41.Between two shunt conduit air inlet/outlets in the trunk line 41 choked flow piece 7 is installed, uses so that the tested gas of constant ratio is diverted to detecting sensor 2.
Embodiment two
As Fig. 3, Fig. 4, shown in Figure 5, make a kind of heat distribution formula mass-flow gas meter, no longer repeat with embodiment one something in common, its difference is to have increased gas distributing device.
Fig. 3 is a heat distribution formula mass-flow gas meter basic structure synoptic diagram, and Fig. 4 is the partial enlarged drawing of Fig. 3, and Fig. 5 is a distribution of air flow nested structure vertical profile synoptic diagram.Flow distributor comprises throttling orifice plate 51 and distribution of air flow cover 52.Throttling orifice plate 51 is sieve shape flat boards, is installed in shunt conduit air inlet/outlet place, filters and enters the gas of shunt conduit 42.Distribution of air flow cover 52 is horn-like pipe fittings, is enclosed within the Venturi meter 3 loudspeaker sections outside, termination technology screw plug 6 ecto-entad precession compactings.It is opposite with Venturi meter 3 loudspeaker opening directions that distribution of air flow is overlapped 52 loudspeaker opening directions.Distribution of air flow is overlapped and is had the hole on 52 tube walls and be connected with shunt conduit 42 appropriate sections.Tested air-flow enters shunt conduit 42 from trunk line 41 through the shunt conduit air inlet/outlet, enters Venturi meter 3 through distribution of air flow cover 52 again.
Claims (10)
1. heat distribution formula mass-flow gas meter, the seal and necessary connector that comprise gauge outfit (1), detecting sensor (2), Venturi meter (3), gas path pipe, necessity, it is characterized in that: described gas path pipe is divided into trunk line (41) and shunt conduit (42), and described Venturi meter (3) is positioned at shunt conduit (42).
2. mass flowmeter according to claim 1 is characterized in that: circular cone contraction section tapering is 7～15 ° before and after the described Venturi meter (3).
3. mass flowmeter according to claim 2 is characterized in that: the anterior circular cone contraction section of described Venturi meter (3) tapering is 8～10 °, and rear portion circular cone contraction section tapering is 12～14 °.
4. mass flowmeter according to claim 1 is characterized in that: the diameter 〉=5mm of described Venturi meter throat (31), the diameter upper limit is determined according to actual operating conditions.
5. mass flowmeter according to claim 4 is characterized in that: described Venturi meter throat (31) diameter is 5～15mm.
6. mass flowmeter according to claim 1 is characterized in that: described Venturi meter (3) diameter ratio is 0.6～0.7.
7. according to the arbitrary described mass flowmeter of claim 1～6, it is characterized in that: also comprise flow distributor, described flow distributor comprises throttling orifice plate (51) and distribution of air flow cover (52); Described throttling orifice plate (51) is an AND DEWATERING FOR ORIFICE STRUCTURE, is positioned at shunt conduit air inlet/outlet place; Described distribution of air flow cover (52) is horn-like pipe fitting, is positioned at the two ends of Venturi meter (3), is enclosed within Venturi meter (3) the loudspeaker section outside respectively, and its loudspeaker opening direction is opposite with Venturi meter (3) loudspeaker opening direction; Having the hole on described distribution of air flow cover (52) tube wall is connected with the appropriate section of shunt conduit (42).
8. mass flowmeter according to claim 7 is characterized in that: technology screw plug (6) is equipped with in termination, described distribution of air flow cover (52) outside.
9. mass flowmeter according to claim 7 is characterized in that: described throttling orifice plate (51) screen-aperture scope is 1/3～1/5 of Venturi tube throat (a 31) diameter.
10. according to claim 1 or 8 or 9 arbitrary described mass flowmeters, it is characterized in that: between the two shunt conduit air inlet/outlets choked flow piece (7) is housed in the described trunk line (41).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202824075U CN201748942U (en) | 2010-08-05 | 2010-08-05 | Heat distribution type gas mass flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202824075U CN201748942U (en) | 2010-08-05 | 2010-08-05 | Heat distribution type gas mass flow meter |
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| Publication Number | Publication Date |
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| CN201748942U true CN201748942U (en) | 2011-02-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010202824075U Expired - Fee Related CN201748942U (en) | 2010-08-05 | 2010-08-05 | Heat distribution type gas mass flow meter |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102175822A (en) * | 2011-03-04 | 2011-09-07 | 中国原子能科学研究院 | UF (ultra filtration factor)6Measuring container of gas uranium abundance online monitoring device |
| CN103175583A (en) * | 2011-12-23 | 2013-06-26 | 比尔克特韦尔克有限公司 | Mass flow measuring or controlling device |
| CN103185615A (en) * | 2011-12-30 | 2013-07-03 | 北京谊安医疗系统股份有限公司 | Diameter-variable orifice-plate flowmeter |
| CN107860443A (en) * | 2017-12-12 | 2018-03-30 | 杭州天马计量科技有限公司 | Air pulsing flow standard experimental rig |
| CN110243424A (en) * | 2019-07-24 | 2019-09-17 | 卓宇轩 | Complicated Gas Flow Measuring Device and Method for Using It to Control Flow |
| CN113932868A (en) * | 2021-09-16 | 2022-01-14 | 中国矿业大学 | Variable-pipe-diameter flow meter correction device and correction method |
| CN114754834A (en) * | 2022-05-24 | 2022-07-15 | 华侨大学 | Constant-power thermal liquid mass flowmeter |
-
2010
- 2010-08-05 CN CN2010202824075U patent/CN201748942U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102175822A (en) * | 2011-03-04 | 2011-09-07 | 中国原子能科学研究院 | UF (ultra filtration factor)6Measuring container of gas uranium abundance online monitoring device |
| CN103175583A (en) * | 2011-12-23 | 2013-06-26 | 比尔克特韦尔克有限公司 | Mass flow measuring or controlling device |
| CN103175583B (en) * | 2011-12-23 | 2017-07-14 | 比尔克特韦尔克有限公司 | Mass flow measurement or control device |
| CN103185615A (en) * | 2011-12-30 | 2013-07-03 | 北京谊安医疗系统股份有限公司 | Diameter-variable orifice-plate flowmeter |
| CN103185615B (en) * | 2011-12-30 | 2016-10-05 | 北京谊安医疗系统股份有限公司 | The orifice-plate flowmeter of reducing |
| CN107860443A (en) * | 2017-12-12 | 2018-03-30 | 杭州天马计量科技有限公司 | Air pulsing flow standard experimental rig |
| CN107860443B (en) * | 2017-12-12 | 2024-02-02 | 杭州天马计量科技有限公司 | Standard test device for gas pulsating flow |
| CN110243424A (en) * | 2019-07-24 | 2019-09-17 | 卓宇轩 | Complicated Gas Flow Measuring Device and Method for Using It to Control Flow |
| CN113932868A (en) * | 2021-09-16 | 2022-01-14 | 中国矿业大学 | Variable-pipe-diameter flow meter correction device and correction method |
| CN113932868B (en) * | 2021-09-16 | 2022-09-13 | 中国矿业大学 | Variable-pipe-diameter flow meter correction device and correction method |
| CN114754834A (en) * | 2022-05-24 | 2022-07-15 | 华侨大学 | Constant-power thermal liquid mass flowmeter |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110216 Termination date: 20160805 |