CN107796452A - Gas flowmeter - Google Patents
Gas flowmeter Download PDFInfo
- Publication number
- CN107796452A CN107796452A CN201711140948.7A CN201711140948A CN107796452A CN 107796452 A CN107796452 A CN 107796452A CN 201711140948 A CN201711140948 A CN 201711140948A CN 107796452 A CN107796452 A CN 107796452A
- Authority
- CN
- China
- Prior art keywords
- admission line
- gas flowmeter
- shell body
- hole section
- backflow air
- 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
- 206010022000 influenza Diseases 0.000 claims abstract description 9
- 238000005259 measurement Methods 0.000 abstract description 11
- 238000001514 detection method Methods 0.000 description 4
- 239000011521 glass Substances 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000003750 conditioning effect Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- G01F1/40—Details of construction of the flow constriction devices
- G01F1/44—Venturi tubes
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
A kind of gas flowmeter, including：Shell body, admission line, rectification set, top cover and connector, admission line is set within the outer shell, ring-type position between shell body and admission line is formed with axially extending multiple backflow air flues along admission line, the upper end of top cover and shell body connects, and top cover and shell body, admission line end between form installing space, rectification is set in installing space；The lower end of connector and shell body connects；Multiple runners that rectification set includes a sprue and connected with sprue, multiple runners set and connected correspondingly with multiple backflow air flues, and sprue connects with the port of export of admission line；Flow sensor is provided with a backflow air flue in multiple backflow air flues.The present invention can use less dimensional space to obtain larger flow measurement range, have larger quantities journey ratio.
Description
Technical field
The present invention relates to field of flow measurement, more particularly to a kind of gas flowmeter.
Background technology
Gas flow rate field has volume flow and the class Cleaning Principle of mass flow two, has in mass flow detection field
Coriolis measuring principle and the class of calorimetric mass flow measurement principle two, calorimetric mass flow measurement have in physical principle
The golden formula law measuring principle of heat transfer distributed measurement principle and heat dissipation effect, thermal mass flow are measured in structural principle
On have the principles such as capillary type, armored, MEMS formula.
Capillary type thermal mass flow meter uses heat distribution formula mass measurement principle, and two groups are wound outside thin-walled measurement pipe
Or three groups of thin hot water radiation wires, composition heating and detecting element.Back-end circuit forms Wheatstone bridge.The output of electric bridge and capillary
The flow flowed through in pipe has functional relation.Low flow velocity and tiny flow quantity (0.02~2m/s) can only be measured, the response time is slow, power consumption
Height, caloric value conference are conducted heat in fluid media (medium).Convection body rectification requires high, and preceding straight length requires longer.
Spinner flowmeter is to calculate the device of flow by measuring (position) of the rotatable parts being located in direct current pipeline,
Float moves up and down under flow velocity and buoyancy, is a kind of volume flow by graduation indication flow after being balanced with float weight
Measure the detection means of Purely mechanical.Range ratio is small, low precision, it is impossible to direct measurement mass flow, it is impossible to change flow signal
, also can not numerical monitor for electric signal.
The content of the invention
The invention provides a kind of gas flowmeter, with solve to measure in the prior art low flow velocity and tiny flow quantity,
Preceding straight length requires longer, bulky problem.
The invention provides a kind of gas flowmeter, including：Shell body, admission line, rectification set, top cover and connector,
The admission line is arranged on the inside of the shell body, and the ring-type position between the shell body and the admission line is formed
There are axially extending multiple backflow air flues along the admission line, the top cover is connected with the upper end of the shell body, and institute
State and form installing space between the end of top cover and the shell body, the admission line, the rectification is set on the peace
Fill in space；The connector is connected with the lower end of the shell body；Rectification set include a sprue and with the master
Multiple runners of flow passage, the multiple runner set and connected correspondingly with the multiple backflow air flue, institute
The port of export that sprue is stated with the admission line connects；Stream is provided with a backflow air flue in the multiple backflow air flue
Quantity sensor.
Preferably, the internal diameter of the admission line from the admission line the port of export from entrance point to the admission line
Direction become larger.
Preferably, the backflow air flue includes the first hole section and the second hole section that set gradually, and the of first hole section
One end connects with the runner, and the second end of first hole section connects with one end of second hole section, first hole
The straight direction radially adjacent to second hole section of section tapers into.
Preferably, second hole section uses Venturi rectifying structure.
Preferably, outlet of the one end of the remote rectification set of the multiple backflow air flue with the gas flowmeter
Connection.
Preferably, the rectification set includes the shunting body of multiple circular tube shapeds, and each shunting body is internally formed one
The runner, the center of circle of the multiple shunting body are arranged on same circumference, and the outer wall phase of the two neighboring shunting body
Connect.
Preferably, the end of one end of the remote admission line of the shunting body is described formed with multiple connectivity slots
Sprue is connected by the connectivity slot with the runner.
Preferably, circumference of the multiple connectivity slot along that shunting body where it is uniformly distributed.
Preferably, formed with five connectivity slots on each shunting body.
Preferably, the diameter of the runner tapers into along the direction away from rectification set.
The present invention can use less dimensional space to obtain larger stream by the way of single tube input, multitube output
Measurement scope, and less flow can be detected using small-range flow sensor in higher sensitivity, so as to ensure that
Gas flowmeter in the present invention has larger quantities journey ratio.
Brief description of the drawings
Fig. 1 shows the sectional view figure of the present invention；
Fig. 2 shows the overall structure diagram of the present invention.
Reference in figure：1st, shell body；2nd, admission line；3rd, rectification set；4th, top cover；5th, connector；6th, flow back air flue；
7th, sprue；8th, runner；9th, installation depression；10th, the first hole section；11st, the second hole section；12nd, shunting body；13rd, connectivity slot；14、
Clear glass；15th, protecgulum；16th, battery cover.
Embodiment
Fig. 1 and Fig. 2 are refer to, the invention provides a kind of gas flowmeter, including：Shell body 1, admission line 2, rectification
Set 3, top cover 4 and connector 5, the admission line 2 are arranged on the inside of the shell body 1, the shell body 1 and the air inlet
Ring-type position between pipeline 2 formed with axially extending multiple backflow air flues 6 along the admission line 2, the top cover 4 with
The upper end connection of the shell body 1, and the top cover 4 and the shell body 1, the admission line 2 end between formed and pacify
Space is filled, the rectification set 3 is arranged in the installing space；The connector 5 is connected with the lower end of the shell body 1；Institute
Stating rectification set 3 includes a sprue 7 and the multiple runners 8 connected with the sprue 7, the multiple runner 8 and institute
State multiple backflow air flues 6 to set and connect correspondingly, the sprue 7 connects with the port of export of the admission line 2；Institute
State in a backflow air flue 6 in multiple backflow air flues 6 and be provided with flow sensor.Rectification set 3 and top cover 4 form air-flow together
Distributor, the air-flow of sprue 7 dissipate and are evenly distributed in runner 8 to surrounding in air-flow distributor.
It refer to Fig. 1, the arrow in Fig. 1 shows the flow direction of gas.As shown in figure 1, air inlet is along upward arrow
Flowed from the bottom to top along the bearing of trend of admission line 2, and enter the sprue 7 of rectification set 3, due to the sprue 7
Connect, therefore be distributed evenly in each runner 8 with multiple runners 8, subsequently into corresponding each backflow air flue 6
In.In each backflow air flue 6, air-flow from top to bottom flows along the flow direction opposite with admission line 2, and wherein one
Flow sensor is provided with individual backflow air flue 6, so as to which the stream in the backflow air flue 6 can be measured by the flow sensor
Amount.Wherein, the circumference of described multiple backflow air flues 6 and corresponding runner along admission line 2 is uniformly distributed, to improve gas
Effect.Finally, actual flow is the flow and the product of the number of backflow air flue 6 that single sensor detects.
During work, the gas flowmeter in the present invention is connected by connector 5 with pipeline, and gas flows to air inlet pipe from pipeline
Road 2, air-flow flow upwardly toward rectification set 3 by admission line 2, and air-flow is evenly distributed in each backflow air flue 6 by rectification set 3, its
In one backflow air flue 6 in be mounted with MEMS sensor component, uninterrupted is converted into output voltage signal.Flowed using MEMS
Quantity sensor, signal sensitivity is high,
In the above-mentioned technical solutions, the present invention is inputted using single tube (i.e. admission line 2), and multitube (flow back air flue 6) is defeated
The mode gone out, and the air flue 6 that flows back, around the circumferentially disposed of admission line 2, the airflow direction of the two is on the contrary, shorten air flue in axle
Upward entire length, less dimensional space can be used to obtain larger flow measurement range；Gas is realized by rectification set 3
Reverse flow with being distributed, in addition to realizing rectified action, also make the flow velocity of backflow air flue 6 reduce, due to it is this
Gas acts on so that the flow of each backflow air flue 6 is smaller compared with the flow of admission line 2, therefore can use in higher sensitivity
Small-range flow sensor detects less flow, so as to which the gas flowmeter that ensure that in the present invention has larger quantities journey
Than.
It can be seen that as a result of said structure, the present invention is applied to measure high flow velocities and stream under smaller structure size
Amount (>Occasion 2m/s), and the response time can accelerate, low in energy consumption, caloric value is small, will not be also transmitted to because of heat in fluid media (medium)
And measurement structure is influenceed, convection body rectification requires low, and preceding straight length requires shorter.
Preferably, entrance point going out to the admission line 2 of the internal diameter of the admission line 2 from the admission line 2
The direction at mouth end becomes larger.So, air flue can be made gradually more slowly to be expanded to top cushion chamber, make the change of air-flow less prominent
So, air-flow more gentle transition.
Preferably, the backflow air flue 6 includes the first hole section 10 and the second hole section 11 set gradually, first hole section
10 first end connects with the runner 8, and the second end of first hole section 10 connects with one end of second hole section 11,
The straight direction radially adjacent to second hole section 11 of first hole section 10 tapers into.So, can entering in backflow air flue 6
The cavity of an expansion, can allow air-flow fully to be spread in cavity, flow field is more uniformly developed at mouthful.
It is highly preferred that second hole section 11 uses Venturi rectifying structure.So, can make to be assigned to each backflow gas
The gas flowfield in road obtains further rectification, attains full development and is formed fully in the installed position flow field of flow sensor
Develop flow field.For example, formed with installation depression 9 in the side wall of shell body 1, flow sensor may be mounted at the flow sensor
In, more specifically, may be provided at the opening position corresponding to Venturi rectifying structure.
Preferably, remote the rectification of the multiple backflow air flue 6 covers 3 one end and gone out with the gas flowmeter
Mouth connection.
Preferably, the rectification set 3 includes the shunting body 12 of multiple circular tube shapeds, and each shunting body 12 is internally formed
One runner 8, the center of circle of the multiple shunting body 12 are arranged on same circumference, and the two neighboring shunting body 12
Outer wall be connected with each other.So, multiple shunting bodies 12 can only rely on its own and just surround rectification set.
Preferably, the end of one end of the remote admission line 2 of the shunting body 12 is formed with multiple connectivity slots 13,
The sprue 7 is connected by the connectivity slot 13 with the runner 8.Preferably, the multiple connectivity slot 13 is along where it
The circumference of that shunting body 12 be uniformly distributed.For example, formed with five connectivity slots 13 on each shunting body 12.This
Sample, a runner 8 with petal type breach can be formed in the air inlet end of each backflow air flue, to allow reflux gas to use up
Amount is even into backflow air flue.Preferably, the diameter of the runner 8 tapers into along the direction that 3 are covered away from the rectification, from
And making the flow field of flow sensor sensing part stable, the stability requirement of output signal is guaranteed.
In a preferred embodiment, the screen pack of ring-type is additionally provided between rectification set 3 and the backflow air flue.Outside
The outside of housing 1 is additionally provided with protecgulum 15 and battery cover 16 in semicircular, and the two surrounds one and is used to place shell body 1 jointly
Space.Wherein, in the space between shell body 1 and protecgulum 15 can also mounting circuit boards, be also formed with being used on protecgulum 15
The opening of clear glass 14 is installed, so, the situation of circuit board can be observed by clear glass 14, for example, observation circuit board
Flow detection data of upper display etc..And in the space between battery cover 16 and shell body, battery can be installed, to be circuit
Plate is powered.Circuit board may include the control circuit and signal conditioning circuit of detection, to be carried out to the signal from flow sensor
Processing and sampling etc..
For example, in one embodiment, the voltage signal that the Huygens's electric bridge being made up of MEMS flow sensor exports, send
Filtering process is amplified to signal conditioning circuit, the Analog-digital Converter module that the signal after processing is given in control circuit is entered
Row Analog-digital Converter is data signal, after being read by controller therein and be processed into flow value, send display output module to show
Show.
By adopting the above-described technical solution, the gas circuit structure in the present invention can reach good rectification effect, ensure gas
The front and rear straight length on road can be 0.
Claims (10)
- A kind of 1. gas flowmeter, it is characterised in that including：Shell body (1), admission line (2), rectification set (3), top cover (4) With connector (5), the admission line (2) is arranged on the inside of the shell body (1), the shell body (1) and the air inlet Ring-type position between pipeline (2) is described formed with axially extending multiple backflow air flues (6) along the admission line (2) Top cover (4) is connected with the upper end of the shell body (1), and the top cover (4) and the shell body (1), the admission line (2) End between form installing space, the rectification set (3) is arranged in the installing space；The connector (5) with it is described The lower end connection of shell body (1)；The rectification set (3) includes a sprue (7) and the multiple runners (8) connected with the sprue (7), described more Individual runner (8) sets and connected correspondingly with the multiple backflow air flue (6), the sprue (7) and the air inlet The port of export connection of pipeline (2)；Flow sensor is provided with a backflow air flue (6) in the multiple backflow air flue (6).
- 2. gas flowmeter according to claim 1, it is characterised in that the internal diameter of the admission line (2) by it is described enter The direction of the entrance point of feed channel (2) to the port of export of the admission line (2) becomes larger.
- 3. gas flowmeter according to claim 1, it is characterised in that the backflow air flue (6) includes what is set gradually First hole section (10) and the second hole section (11), the first end of first hole section (10) connect with the runner (8), and described Second end of one hole section (10) connects with one end of second hole section (11), first hole section (10) it is straight radially adjacent to institute The direction for stating the second hole section (11) tapers into.
- 4. gas flowmeter according to claim 3, it is characterised in that second hole section (11) uses Venturi rectifying Structure.
- 5. gas flowmeter according to claim 1, it is characterised in that the multiple backflow air flue (6) away from described Outlet of the one end of rectification set (3) with the gas flowmeter is connected.
- 6. gas flowmeter according to claim 1, it is characterised in that the rectification set (3) includes multiple circular tube shapeds Shunting body (12), each shunting body (12) are internally formed a runner (8), the multiple shunting body (12) The center of circle is arranged on same circumference, and the outer wall of the two neighboring shunting body (12) is connected with each other.
- 7. gas flowmeter according to claim 6, it is characterised in that the remote air inlet pipe of the shunting body (12) The end of the one end in road (2) passes through the connectivity slot (13) and described point formed with multiple connectivity slots (13), the sprue (7) Runner (8) connects.
- 8. gas flowmeter according to claim 7, it is characterised in that the multiple connectivity slot (13) is along that where it The circumference of individual shunting body (12) is uniformly distributed.
- 9. gas flowmeter according to claim 7, it is characterised in that formed with five on each shunting body (12) The connectivity slot (13).
- 10. gas flowmeter according to claim 6, it is characterised in that the diameter of the runner (8) is along away from described The direction of rectification set (3) tapers into.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711140948.7A CN107796452A (en) | 2017-11-16 | 2017-11-16 | Gas flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711140948.7A CN107796452A (en) | 2017-11-16 | 2017-11-16 | Gas flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107796452A true CN107796452A (en) | 2018-03-13 |
Family
ID=61535251
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711140948.7A Pending CN107796452A (en) | 2017-11-16 | 2017-11-16 | Gas flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107796452A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111307228A (en) * | 2020-02-26 | 2020-06-19 | 中国计量大学 | Modular pressure level difference type laminar flow sensing element |
| CN112345707A (en) * | 2020-11-16 | 2021-02-09 | 湖南碧臣环境能源有限公司 | Gas measuring device |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5230254A (en) * | 1992-01-22 | 1993-07-27 | Ametek Aerospace Products Inc. | Coriolis mass flowmeter with multiple vibrating tubes |
| JP2002122452A (en) * | 2000-08-11 | 2002-04-26 | Ngk Spark Plug Co Ltd | Divided flow type flowmeter |
| JP2002333347A (en) * | 2001-05-08 | 2002-11-22 | Ngk Spark Plug Co Ltd | Distributary flow meter |
| CN1936506A (en) * | 2006-04-29 | 2007-03-28 | 浙江麦姆龙仪表有限公司 | Small section branch-flow measuring method for large-diameter gas flow and apparatus thereof |
| CN102116667A (en) * | 2011-01-14 | 2011-07-06 | 重庆工业自动化仪表研究所 | Large-aperture gas flow calibration device capable of providing two flow fields |
| CN202748068U (en) * | 2012-05-31 | 2013-02-20 | 卓度仪表（控股）有限公司 | Gas flowmeter |
| CN103398747A (en) * | 2013-08-07 | 2013-11-20 | 陕西天仪智能仪表有限公司 | Gas flowmeter and application method thereof |
| CN203658851U (en) * | 2013-11-26 | 2014-06-18 | 张松涛 | Mass flow controller structure based on MEMS sensor |
| CN203657862U (en) * | 2014-01-07 | 2014-06-18 | 成都安迪生测量有限公司 | Flow dividing main body of Coriolis mass flow meter |
| DE102015014697B3 (en) * | 2015-11-13 | 2017-01-05 | Rota Yokogawa Gmbh & Co Kg | Coriolis mass flowmeter |
| CN206056692U (en) * | 2016-08-10 | 2017-03-29 | 辽宁思凯科技股份有限公司 | A kind of MEMS thermal mass gas meter, flow meters equipped with many bypass measurement apparatus |
| CN206420511U (en) * | 2016-12-14 | 2017-08-18 | 浙江双良汽车零部件有限公司 | Mass air flow sensor |
| CN206583495U (en) * | 2016-12-30 | 2017-10-24 | 杭州思筑智能设备有限公司 | A kind of built-in rectifier for Ultrasonic Wave Flowmeter |
| CN207423280U (en) * | 2017-11-16 | 2018-05-29 | 矽翔微机电系统（上海）有限公司 | Gas flowmeter |
-
2017
- 2017-11-16 CN CN201711140948.7A patent/CN107796452A/en active Pending
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5230254A (en) * | 1992-01-22 | 1993-07-27 | Ametek Aerospace Products Inc. | Coriolis mass flowmeter with multiple vibrating tubes |
| JP2002122452A (en) * | 2000-08-11 | 2002-04-26 | Ngk Spark Plug Co Ltd | Divided flow type flowmeter |
| JP2002333347A (en) * | 2001-05-08 | 2002-11-22 | Ngk Spark Plug Co Ltd | Distributary flow meter |
| CN1936506A (en) * | 2006-04-29 | 2007-03-28 | 浙江麦姆龙仪表有限公司 | Small section branch-flow measuring method for large-diameter gas flow and apparatus thereof |
| CN102116667A (en) * | 2011-01-14 | 2011-07-06 | 重庆工业自动化仪表研究所 | Large-aperture gas flow calibration device capable of providing two flow fields |
| CN202748068U (en) * | 2012-05-31 | 2013-02-20 | 卓度仪表（控股）有限公司 | Gas flowmeter |
| CN103398747A (en) * | 2013-08-07 | 2013-11-20 | 陕西天仪智能仪表有限公司 | Gas flowmeter and application method thereof |
| CN203658851U (en) * | 2013-11-26 | 2014-06-18 | 张松涛 | Mass flow controller structure based on MEMS sensor |
| CN203657862U (en) * | 2014-01-07 | 2014-06-18 | 成都安迪生测量有限公司 | Flow dividing main body of Coriolis mass flow meter |
| DE102015014697B3 (en) * | 2015-11-13 | 2017-01-05 | Rota Yokogawa Gmbh & Co Kg | Coriolis mass flowmeter |
| CN206056692U (en) * | 2016-08-10 | 2017-03-29 | 辽宁思凯科技股份有限公司 | A kind of MEMS thermal mass gas meter, flow meters equipped with many bypass measurement apparatus |
| CN206420511U (en) * | 2016-12-14 | 2017-08-18 | 浙江双良汽车零部件有限公司 | Mass air flow sensor |
| CN206583495U (en) * | 2016-12-30 | 2017-10-24 | 杭州思筑智能设备有限公司 | A kind of built-in rectifier for Ultrasonic Wave Flowmeter |
| CN207423280U (en) * | 2017-11-16 | 2018-05-29 | 矽翔微机电系统（上海）有限公司 | Gas flowmeter |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111307228A (en) * | 2020-02-26 | 2020-06-19 | 中国计量大学 | Modular pressure level difference type laminar flow sensing element |
| CN112345707A (en) * | 2020-11-16 | 2021-02-09 | 湖南碧臣环境能源有限公司 | Gas measuring device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102735300B (en) | Gas flowmeter and gas flow rate measuring method | |
| CN102645249B (en) | There is the flow sensor assembly of integrated bypass passage | |
| CN101126652B (en) | Electronic gas meter for mass and flow | |
| CN101467008B (en) | Multi-vortex flowmeter integrating pressure gauge | |
| CN102620792A (en) | Flow sensor with enhanced flow range capability | |
| CN100453978C (en) | Multi-vortex flow meter | |
| CN102288232A (en) | Molded flow restrictor | |
| CN100416233C (en) | Measuring method and its device for external leading sampling of pipeline gas flow | |
| US4538925A (en) | Thermal power measuring device | |
| CN100424332C (en) | Device and method for measuring automobile engine air flow with self detection | |
| CN107796452A (en) | Gas flowmeter | |
| JPH11183228A (en) | Gas meter | |
| CN1936506A (en) | Small section branch-flow measuring method for large-diameter gas flow and apparatus thereof | |
| CN207423280U (en) | Gas flowmeter | |
| CN202748068U (en) | Gas flowmeter | |
| CN210321856U (en) | Air heating type flowmeter | |
| CN202057360U (en) | Combined gas flow meter | |
| CN100416234C (en) | Measuring method and its device for external screw sampling of pipeline gas flow | |
| CN201514246U (en) | Inserted type thermal type liquid quality flowmeter | |
| CN102721448B (en) | Anti-smudginess inserted vortex shedding flowmeter | |
| CN105158503B (en) | Hot-wire array sensor | |
| CN212082473U (en) | Matrix flowmeter | |
| CN1936513A (en) | Gas-mass-flow up-down-stream temperature distribution secondary differential measuring method, sensor and flowmeter | |
| CN203643056U (en) | Water card type heat flux sensor | |
| CN202008375U (en) | Hot film type air mass flow meter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |