CN108548573B - Differential pressure flowmeter - Google Patents
Differential pressure flowmeter Download PDFInfo
- Publication number
- CN108548573B CN108548573B CN201810420864.7A CN201810420864A CN108548573B CN 108548573 B CN108548573 B CN 108548573B CN 201810420864 A CN201810420864 A CN 201810420864A CN 108548573 B CN108548573 B CN 108548573B
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- probe
- pipeline
- fluid
- elastic diaphragm
- pressure
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- 239000000523 sample Substances 0.000 claims abstract description 64
- 239000012530 fluid Substances 0.000 claims abstract description 44
- 238000003466 welding Methods 0.000 claims description 5
- 239000012528 membrane Substances 0.000 description 6
- 230000006872 improvement Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 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
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The differential pressure flowmeter comprises a measuring pipeline, a pressure sensor, an elastic diaphragm and a probe, wherein a groove is formed in the position of the measuring pipeline, which is vertically symmetrical, the elastic diaphragm is arranged on two sides of the groove, which are vertical to the fluid direction, the elastic diaphragm is used for converting the lateral pressure of the probe into the deformation of the elastic diaphragm, one surface of the elastic diaphragm, which is positioned in the measuring pipeline, is connected with the probe, and the pressure sensor is arranged on the other surface of the elastic diaphragm. When fluid flows through the probe, the fluid generates pressure difference perpendicular to the surface of the probe, the pressure difference has an exact numerical relation with the property (density and the like) of the fluid and the speed of the fluid, and the pressure sensors at the two ends of the probe measure the pressure difference and then combine the property of the fluid with the geometric structure of the pipeline to calculate the flow. The invention has the characteristics of small pressure loss to fluid, reduced consumption of extra energy sources and the like.
Description
Technical Field
The invention relates to a differential pressure type flowmeter.
Background
Flow is the amount of fluid flowing through a cross section of a conduit per unit time, and is commonly expressed as mass flow or volumetric flow. With the improvement of the automation degree of the modern production process, the requirement on flow measurement is also improved, but due to the diversity of environments and the complexity of flow measurement in the industrial production process, the selection of the flowmeter needs to comprehensively consider factors such as measuring range, pressure loss, fluid properties and the like.
The flowmeter is widely used in the industrial fields of petroleum, natural gas, chemical industry, metallurgy, electric power, papermaking, urban gas, machinery, shipbuilding and the like.
The existing differential pressure type flowmeter can generate differential pressure before and after the throttling device according to Bernoulli principle when fluid passes through the throttling device by installing the throttling device in the pipeline, the flow is proportional to the square root of the differential pressure, the differential pressure is measured, the flow can be calculated by combining known fluid conditions and the geometric dimensions of the throttling device and the pipeline, and the throttling device is installed in the pipeline, so that the pressure loss of the fluid in the pipeline is large, and extra energy is consumed.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects in the prior art and provide the differential pressure type flowmeter with small pressure loss of fluid in a pipeline.
The technical scheme adopted for solving the technical problems is as follows: the differential pressure flowmeter comprises a measuring pipeline, a pressure sensor, an elastic diaphragm and a probe, wherein a groove is formed in the position of the measuring pipeline, which is vertically symmetrical, the elastic diaphragm is arranged on two sides of the groove, which are vertical to the fluid direction, the elastic diaphragm is used for converting the lateral pressure of the probe into the deformation of the elastic diaphragm, one surface of the elastic diaphragm, which is positioned in the measuring pipeline, is connected with the probe, and the pressure sensor is arranged on the other surface of the elastic diaphragm.
Further, the surface of the elastic diaphragm, which is positioned in the measuring pipeline, is connected with the probe in a welding mode.
Further, the measuring pipeline is a pipeline with the same length of 45-55mm (preferably 50 mm) or other numerical values as the inner diameter of the measured pipeline, and is installed on the measured pipeline through a flange or other installation modes.
Furthermore, the appearance of probe is through special design, and whole streamline form that appears, and the boss at probe both ends is connected with the elastic diaphragm through the welded mode, and the elastic diaphragm is fixed in the inboard of measuring pipeline's recess, and when fluid flow passed the probe, the probe can take place lateral displacement.
Further, when the probe is laterally displaced, the pressure sensor can measure the pressure difference between two sides of the probe, and the pressure difference and the flow velocity of the fluid in the pipeline are in a definite numerical relation.
According to the invention, the probe rod perpendicular to the speed direction of the fluid is arranged in the pipeline, the pressure sensors are arranged at the two ends of the probe rod, when the fluid flows through the probe rod, the fluid can generate a pressure difference perpendicular to the surface of the probe rod due to the special appearance of the probe rod, the pressure difference is similar to the lift force on the wing of an airplane, the pressure difference has an exact numerical relation with the property (density and the like) of the fluid and the speed of the fluid, and the pressure sensors at the two ends of the probe rod are used for measuring the pressure and then combining the property of the fluid and the geometric structure of the pipeline, so that the flow can be calculated.
The invention replaces the throttling device with the probe, and the pressure loss to the fluid is smaller because the appearance of the probe is streamline and the volume is smaller.
Drawings
FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present invention;
FIG. 2 is a left side view of the embodiment shown in FIG. 1;
FIG. 3 is a top view of the embodiment of FIG. 1;
FIG. 4 is an enlarged schematic view of the probe and pressure sensor assembly in the C-section measurement pipe of the embodiment of FIG. 1;
FIG. 5 is a front view of the probe of the embodiment of FIG. 1;
FIG. 6 is a left side view of the probe of the embodiment of FIG. 1;
FIG. 7 is a top view of the probe of the embodiment of FIG. 1;
fig. 8 is an enlarged schematic view of the exterior of the probe of the embodiment of fig. 1.
Detailed Description
The invention is further described below with reference to the drawings and examples.
Referring to fig. 1-4, the embodiment comprises a measuring pipeline 1, a pressure sensor 2, an elastic membrane 3 and a probe 4, wherein a groove is formed in the measuring pipeline 1 at a position which is vertically symmetrical, the elastic membrane 3 is arranged at two sides of the inside of the groove and perpendicular to the fluid direction, the elastic membrane 3 is used for converting lateral pressure of the probe 4 into deformation of the elastic membrane 3, one surface of the elastic membrane 3, which is positioned in the measuring pipeline 1, is connected with the probe 4 in a welding mode, and the pressure sensor 2 is arranged at the other surface of the elastic membrane 3.
In this embodiment, the boss at probe both ends uses the welding mode to weld the inboard at the elastic diaphragm in the measuring pipeline recess, and pressure sensor is installed in the outside of elastic diaphragm, and as shown in fig. 2, the inside of probe is hollow, and hollow volume is designed according to the density of fluid, guarantees that the probe is suspended in fluid under the buoyancy effect of fluid, does not produce the tensile force on the vertical direction to the elastic diaphragm at both ends.
Referring to fig. 5-8, the shape and structure of the probe is specially designed to be streamline overall, and when fluid flows through the probe, two sides of the probe generate a pressure difference perpendicular to the surface of the probe according to the bernoulli principle. The pressure difference at two sides of the probe is as follows，CFor the flow coefficient>For the density of the fluid>As a function of the flow rate of the fluid,Sis the probe area. The four pressure sensors installed at the two ends of the probe have similar performances, and when the external temperature changes, the temperature drift of the four pressure sensors is similar so as to reduce the temperature drift of the flowmeter. When the fluid in the pipeline is in a static state, the pressure of the static pressure of the fluid on one side of the probe is equal to or opposite to the pressure of the static pressure of the fluid on the other side of the probe, and the pressure difference of the two sides of the probe is equal to zero. When fluid in the pipeline flows, when the probe moves laterally under the action of pressure difference at two sides, tension is applied to the upper end and the lower end of the probe at the same side of the probe, pressure is applied to the upper end and the lower end of the other side of the probe, a pressure sensor arranged at the outer side of the elastic diaphragm generates corresponding resistance change under the action of deformation, a corresponding measuring circuit is adopted to measure the change value of the resistance, the pressure difference at two sides of the probe can be measured, the flow velocity of the fluid can be measured, and the flow of the fluid in the pipeline can be obtained by combining the geometric parameters of the pipeline. The flow is calculated as follows:
the formula 1 is shown as the following formula
All of the above the formula 2
The following are all the following [ formula 3 ]
In the middle ofFor the pressure difference of the two sides of the probe +.>、/>、/>、/>As measured values of the four sensors,Cis a flow coefficient, is related to the property of the fluid to be measured and the structural shape and installation of the probe, and is measured by test,/->For the density of the fluid to be the same,Sfor the projected area of the probe surface in the direction perpendicular to the fluid direction, C, +.>、SIs a known quantity after the flowmeter design is complete, < >>As a function of the flow rate of the fluid,Qis the flow rate flowing through the section of the pipeline per unit time,Dto measure the diameter of the pipe.
The foregoing describes in detail a preferred embodiment of the present invention. The embodiments are only used to help understand the core idea of the invention. It should be noted that it will be apparent to those skilled in the art that several improvements and modifications can be made to the present invention without departing from the principles of the invention, and these improvements and modifications will also fall within the scope of the appended claims.
Claims (3)
1. Differential pressure formula flowmeter, its characterized in that: the pressure sensor comprises a measuring pipeline, a pressure sensor, an elastic diaphragm and a probe rod, wherein a groove is formed in the measuring pipeline at the position which is vertically symmetrical, the elastic diaphragm is arranged at the two sides of the inside of the groove and perpendicular to the fluid direction, the elastic diaphragm is used for converting the lateral pressure of the probe rod into the deformation of the elastic diaphragm, one surface of the elastic diaphragm, which is positioned in the measuring pipeline, is connected with the probe rod, and the pressure sensor is arranged at the other surface of the elastic diaphragm;
one surface of the elastic diaphragm, which is positioned in the measuring pipeline, is connected with the probe in a welding way;
the probe is hollow, and the hollow volume is designed according to the density of the fluid;
the appearance of the probe is in a streamline shape as a whole, bosses at two ends of the probe are connected with elastic diaphragms in a welding mode, the elastic diaphragms are fixed on the inner sides of grooves of the measuring pipeline, and when fluid flows through the probe, the probe can laterally displace;
when the probe is laterally displaced, the pressure sensor can measure the pressure difference at two sides of the probe, and the pressure difference and the flow velocity of the fluid in the pipeline are in a definite numerical relation.
2. The differential pressure flow meter of claim 1, wherein: the measuring pipeline is a section of pipeline with the same inner diameter as the measured pipeline and the length of 45-55mm, and is arranged on the measured pipeline through a flange.
3. The differential pressure flow meter of claim 2, wherein: the measuring pipeline is a section of pipeline with the same length as the inner diameter of the measured pipeline and the length of 50 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810420864.7A CN108548573B (en) | 2018-05-04 | 2018-05-04 | Differential pressure flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810420864.7A CN108548573B (en) | 2018-05-04 | 2018-05-04 | Differential pressure flowmeter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108548573A CN108548573A (en) | 2018-09-18 |
| CN108548573B true CN108548573B (en) | 2024-03-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810420864.7A Active CN108548573B (en) | 2018-05-04 | 2018-05-04 | Differential pressure flowmeter |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110631647B (en) * | 2019-08-19 | 2020-08-25 | 吉林大学 | Bionic micro-flow sensor and detection method thereof |
| CN112890703A (en) * | 2021-01-14 | 2021-06-04 | 深圳拓邦股份有限公司 | Water quantity control method and device for floor washing machine, floor washing machine and readable storage medium |
| CN113983224A (en) * | 2021-10-12 | 2022-01-28 | 康赛特自动化集团有限公司 | Electric actuator device for Internet of things and use method thereof |
| CN114280326B (en) * | 2021-12-23 | 2023-08-25 | 广西大学 | Karst depression waterlogging water falling hole flow velocity measuring device and overflow capacity monitoring method |
| CN115371752A (en) * | 2022-08-08 | 2022-11-22 | 重庆川仪自动化股份有限公司 | Pipeline type thermal gas mass flowmeter |
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|---|---|---|---|---|
| SU445835A1 (en) * | 1972-09-06 | 1974-10-05 | Предприятие П/Я Г-4725 | Flow sensor |
| JPS5447673A (en) * | 1977-08-30 | 1979-04-14 | Siemens Ag | Device of measuring minute displacement |
| CN2103121U (en) * | 1990-12-24 | 1992-04-29 | 徐孟飚 | Equalizing speed flowmeter |
| CN1078305A (en) * | 1992-12-12 | 1993-11-10 | 通辽发电总厂 | Twin fulcrum target type flow sensor |
| JPH10142018A (en) * | 1996-11-08 | 1998-05-29 | Yokogawa Electric Corp | Vortex flowmeter |
| WO2000066979A1 (en) * | 1999-05-05 | 2000-11-09 | Venture Measurement Company, Llc | Force-sensing mass flow meter |
| CN2837795Y (en) * | 2005-09-28 | 2006-11-15 | 宋涛 | Translation and target type flowmeter |
| CN101629836A (en) * | 2009-08-17 | 2010-01-20 | 昆明理工大学 | Target type fiber grating liquid flowmeter |
| CN204831390U (en) * | 2015-05-13 | 2015-12-02 | 厦门均溪自控有限公司 | High temperature resistant target flowmeter |
| FR3025602A1 (en) * | 2014-09-08 | 2016-03-11 | Turbomeca | HYDRAULIC COUPLER |
| CN106872094A (en) * | 2015-12-11 | 2017-06-20 | 辉固科技有限公司 | Pressure sensor and the sensing system including one or more pressure sensors |
| CN107588813A (en) * | 2017-08-26 | 2018-01-16 | 上海曼斐电器贸易有限公司 | A kind of target type meter |
| CN208140195U (en) * | 2018-05-04 | 2018-11-23 | 湖南菲尔斯特传感器有限公司 | A kind of differential pressure flowmeter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170108361A1 (en) * | 2015-10-18 | 2017-04-20 | Cdi Meters, Inc. | Target Flowmeter |
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2018
- 2018-05-04 CN CN201810420864.7A patent/CN108548573B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU445835A1 (en) * | 1972-09-06 | 1974-10-05 | Предприятие П/Я Г-4725 | Flow sensor |
| JPS5447673A (en) * | 1977-08-30 | 1979-04-14 | Siemens Ag | Device of measuring minute displacement |
| CN2103121U (en) * | 1990-12-24 | 1992-04-29 | 徐孟飚 | Equalizing speed flowmeter |
| CN1078305A (en) * | 1992-12-12 | 1993-11-10 | 通辽发电总厂 | Twin fulcrum target type flow sensor |
| JPH10142018A (en) * | 1996-11-08 | 1998-05-29 | Yokogawa Electric Corp | Vortex flowmeter |
| WO2000066979A1 (en) * | 1999-05-05 | 2000-11-09 | Venture Measurement Company, Llc | Force-sensing mass flow meter |
| CN2837795Y (en) * | 2005-09-28 | 2006-11-15 | 宋涛 | Translation and target type flowmeter |
| CN101629836A (en) * | 2009-08-17 | 2010-01-20 | 昆明理工大学 | Target type fiber grating liquid flowmeter |
| FR3025602A1 (en) * | 2014-09-08 | 2016-03-11 | Turbomeca | HYDRAULIC COUPLER |
| CN204831390U (en) * | 2015-05-13 | 2015-12-02 | 厦门均溪自控有限公司 | High temperature resistant target flowmeter |
| CN106872094A (en) * | 2015-12-11 | 2017-06-20 | 辉固科技有限公司 | Pressure sensor and the sensing system including one or more pressure sensors |
| CN107588813A (en) * | 2017-08-26 | 2018-01-16 | 上海曼斐电器贸易有限公司 | A kind of target type meter |
| CN208140195U (en) * | 2018-05-04 | 2018-11-23 | 湖南菲尔斯特传感器有限公司 | A kind of differential pressure flowmeter |
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| CN108548573A (en) | 2018-09-18 |
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Address after: 410011 floor 4, building 1, zhiyuanyuan, Zhenhua Road, Yuhua District, Changsha City, Hunan Province Applicant after: FIRSTRATE SENSOR CO.,LTD. Address before: 410000 F building, 18 Electrolux Avenue, Changsha, Hunan, China. Applicant before: FIRSTRATE SENSOR CO.,LTD. |
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