CN105910660B - Momentum type flow sensor and detection method thereof - Google Patents
Momentum type flow sensor and detection method thereof Download PDFInfo
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- CN105910660B CN105910660B CN201610367306.XA CN201610367306A CN105910660B CN 105910660 B CN105910660 B CN 105910660B CN 201610367306 A CN201610367306 A CN 201610367306A CN 105910660 B CN105910660 B CN 105910660B
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- 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
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- 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
- G01F1/38—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 the pressure or differential pressure being measured by means of a movable element, e.g. diaphragm, piston, Bourdon tube or flexible capsule
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- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention provides a momentum type flow sensor and a detection method thereof, the momentum type flow sensor comprises a sensor probe and a signal processor, the sensor probe comprises a differential pressure sensor probe, a detection box and an air source, the differential pressure sensor probe is provided with two pressure detection cavities, each pressure detection cavity is correspondingly provided with a pressure detection end, the pressure detection ends are connected with the signal processor, the detection box is provided with a fluid inlet and a fluid outlet so that fluid flows through the interior of the detection box, the detection box and the two pressure detection cavities are respectively communicated through a fluid passage, the air source is arranged in the middle position of the two fluid passages, the air supply direction of the air source also points to the middle position of the two fluid passages, and the fluid passage and the air source are respectively arranged on two opposite sides of the fluid in the flow passage in the detection box. The flow sensor solves the problems that the traditional power measurement mode is adopted in most of the existing flow sensors, the limitations of low measurement precision, large energy consumption and the like exist, and the flow sensor cannot be well qualified in many occasions. The invention belongs to the field of flow detection.
Description
Technical Field
The invention relates to a flow sensor, and belongs to the technical field of flow sensing monitoring.
Background
In modern industrial processes, especially automated processes, various sensors are often used to monitor and control various parameters of the process, to operate the equipment in a normal or optimal state, and to maximize the quality of the product. Sensors have also long penetrated extremely widespread fields such as industrial production, space development, marine exploration, environmental protection, resource investigation, medical diagnostics, biotechnology, and even cultural relic protection. The present invention is one of many classes of sensors-flow sensors. With the development of sensor technology, various flow sensors have appeared, and the most common ones are of a vane type, a vortex street type, a karman vortex type, a hot wire type, etc. However, sensors such as vane type, vortex street type, karman vortex type, hot wire type and the like mostly adopt the traditional dynamic measurement mode, have the limitations of low measurement precision, large energy consumption and the like, and cannot be well performed in many occasions.
Disclosure of Invention
The invention aims to: the momentum type flow sensor and the detection method thereof are provided to solve the problems that the traditional dynamic measurement mode is mostly adopted in the existing flow sensor, the limitations of low measurement precision, large energy consumption and the like are possessed, and the existing flow sensor cannot be well qualified in many occasions.
The scheme of the invention is as follows: the utility model provides a momentum formula flow sensor, including sensor probe and signal processor, sensor probe includes the differential pressure sensor probe, detection case and air supply, the differential pressure sensor probe has two pressure detection chambeies, every pressure detection intracavity all corresponds and is provided with the pressure detection end, the pressure detection end links to each other with signal processor, have fluid entry and fluid outlet on the detection case so that the inside of fluid flow through the detection case, the detection case is linked together through a fluid passage respectively with two pressure detection chambeies, the directional intermediate position of two fluid passages of air supply direction of air supply, and fluid passage and air supply set up respectively in the relative both sides of fluid at the inside circulation path of detection case.
The pressure difference sensor probe is an optical fiber pressure difference sensor probe, the pressure detection end is an optical fiber detection end, an optical fiber bundle of the pressure detection end is formed by assembling and armoring an incident optical fiber and an emergent optical fiber, the other end of the incident optical fiber is butted with a light source and is used for coupling incident light, the emergent ends of the emergent optical fibers are respectively connected with a signal processor after passing through a photoelectric conversion unit, an output light intensity signal is converted into an electric signal and then input into the signal processor, and the signal processor carries out ratio operation on the two paths of signals to calculate the pressure difference in the two pressure detection cavities;
the optical fiber is characterized by further comprising a light source, a Y-shaped coupler and an optical fiber, wherein the light source is arranged at one end of the optical fiber and used for generating an optical fiber signal, the optical signal emitted by the light source is coupled into the optical fiber, the other end of the optical fiber is divided into two paths of light source incidence optical fibers after passing through the Y-shaped coupler, and the two paths of light source incidence optical fibers are respectively correspondingly connected to two pressure detection ends in the sensor probe and serve as incidence optical fibers of the pressure detection ends.
The flow direction of the fluid in the detection box is vertical to the air supply direction of the air source;
the detection box is arranged on one side of the differential pressure sensor probe, the detection box and the differential pressure sensor probe are of an integrated structure, and a filter screen is arranged on a fluid passage.
A momentum-based flow sensing detection method comprises the following steps:
the sensor probe comprises a differential pressure sensor probe, a detection box with a fluid circulation passage and an air source;
the pressure difference sensor probe is provided with two pressure detection cavities, the detection box is communicated with the two pressure detection cavities through a fluid passage respectively, the air source is used for injecting air towards the middle position of the two fluid passages, the fluid passage and the air source are arranged on two opposite sides of the fluid passage in the detection box respectively, if no detected fluid flows in the detection box, the pressure in the pressure detection cavities is the same, and the pressure detection end detects that the pressure difference between the two cavities is zero; if a measured fluid flows in the detection box, the air source is started to blow air to form air flow, the measured fluid and the air flow interact in the detection box, so that the initial momentum of the measured fluid and the air flow is changed, the mixed fluid deviates in the detection box, the mixed fluid entering the two pressure detection cavities forms pressure difference in the two pressure detection cavities, the fluid pressures in the two pressure detection cavities are detected through the pressure detection ends respectively, signals are transmitted to the signal processor to carry out ratio operation on the fluid pressures in the two pressure detection cavities, the pressure difference of the fluid in the two pressure detection cavities is obtained, then a momentum difference mathematical model is established, and the fluid momentum is obtained through calculation.
The air injection direction of the air source is vertical to the flow direction of the fluid in the detection box.
The momentum pressure difference mathematical model is as follows: analyzing the relationship between the transmission quantity and the pressure difference, and setting the speed of the air flow as VsThe velocity of the measured fluid is V, wherein VsThe air flow speed emitted from the air source is a known quantity, and a pressure difference and momentum M of two fluids are formed in the two pressure detection cavitiessRelated to/M, where M is the momentum of the fluid being measured, MsMomentum of air flow, respectively
And V2Is in direct proportion.
M＝kV2
Namely:
then:
wherein k is1For known quantities, and thus the value of V can be found after Δ P is known, in tests we take VsEqual to 5m/s, take k1V varies from 1m/s to 2m/s, the curve of which is shown in fig. 4.
Compared with the prior art, the invention has the following main advantages: the sensor has the advantages that the sensor is small in structure, high in accuracy and reliability, good in adaptability and interchangeability and the like, can be suitable for a plurality of fluid flow detection occasions, the photoelectric sensing principle is applied to the flow detection field, output values of output signals are multiplied after photoelectric conversion and signal processing calculation, accordingly, the detection sensitivity is improved, the sensor has very important practical application values, and the reliability, the adaptability and the interchangeability of the sensor are greatly improved and are suitable for measuring the fluid flow; the intensity compensation principle of the sensor is simpler, the practicability is stronger, and the novel flow sensor has a great promoting effect on the design and popularization of the novel flow sensor.
Drawings
FIG. 1 is a system schematic of the sensor;
FIG. 2 is a cross-sectional view of the sensor probe structure;
FIG. 3 is a detection schematic;
FIG. 4 is a graph of fluid momentum versus pressure differential across the piston.
Detailed Description
In order that the objects, aspects and advantages of the present invention will become more apparent, the present invention will be described in further detail with reference to the accompanying drawings,
example (b):
referring to fig. 1 to 3, the embodiment provides a momentum flow sensor, which includes a sensor probe 1 and a signal processor 2, where the sensor probe 1 includes a differential pressure sensor probe 11, a detection box 12 and an air source 13, the differential pressure sensor probe 11 has two pressure detection cavities 14, a pressure detection end 15 is correspondingly disposed in each pressure detection cavity 14, the pressure detection end 15 is connected to the signal processor 2, the detection box 12 has a fluid inlet 16 and a fluid outlet 17 so that a fluid flows through the inside of the detection box 12, the detection box 12 and the two pressure detection cavities 14 are respectively communicated through a fluid passage 18, an air supply direction of the air source 13 points to a middle position of the two fluid passages 18, the fluid passages 18 and the air source 13 are respectively disposed on opposite sides of a fluid flow passage inside the detection box 12, a flow direction of the fluid inside the detection box 12 is perpendicular to an air supply direction of the air source 13, the detection box 12 is arranged at one side of the differential pressure sensor probe 11, the two are of an integrated structure, and the fluid passage 18 is provided with a filter screen 4.
The pressure difference sensor probe 11 is an optical fiber pressure difference sensor probe, the pressure detection end 15 is an optical fiber detection end, an optical fiber bundle of the pressure detection end 15 is formed by assembling and armoring an incident optical fiber 151 and an emergent optical fiber 152, the other end of the incident optical fiber 151 is butted with a light source for coupling incident light, and the emergent ends of the emergent optical fibers 152 are respectively connected with the signal processor 2 after passing through the photoelectric conversion unit 3;
the optical fiber pressure sensor is characterized by further comprising a light source 5, a Y-shaped coupler 6 and an optical fiber 7, wherein the light source 5 is arranged at one end of the optical fiber 7 and used for generating an optical fiber signal, the optical signal emitted by the light source 5 is coupled into the optical fiber 7, the other end of the optical fiber 7 passes through the Y-shaped coupler 6 and then is divided into two paths of light source incident optical fibers, and the two paths of light source incident optical fibers are correspondingly connected to two pressure detection ends 15 in the sensor probe 1 and serve as incident optical fibers 151 of the pressure detection ends 15;
as shown in fig. 3, the test fluid (i.e., the air flow) entering from the air source 13 is coupled with and interacts with the fluid to be tested, and the flow field of the test fluid is shifted from a uniform distribution to one side (right side) by the fluid to be tested. When the flow field of the testing fluid is uniformly distributed (namely, the tested fluid does not flow), the flow rates of the fluid entering the two pressure detection cavities 14 are the same, and the pressures of the fluid in the two pressure detection cavities 14 are the same; when the test fluid flow field is shifted to the right (the measured fluid flows to the right), the flow rate of the fluid entering the two pressure detection chambers 14 is increased, and the flow rate of the fluid entering the left pressure detection chamber 14 is relatively small, so that a pressure difference is generated between the two pressure detection chambers 14.
A momentum type flow sensing detection method comprises the following steps:
the air source 13 is used for injecting air towards the middle position of the two fluid passages 18, if no measured fluid flows in the detection box 12, the pressure in the pressure detection cavity 14 is the same, and the pressure detection end 15 detects that the pressure difference between the two cavities is zero; if a fluid to be detected flows in the detection box 12, the air source 13 is started to blow air to form air flow, the fluid to be detected and the air flow interact in the detection box 12, so that the initial momentum of the fluid to be detected and the air flow changes, the mixed fluid deflects in the detection box 12, the mixed fluid entering the two pressure detection cavities 14 forms pressure difference in the two pressure detection cavities 14, the fluid pressures in the two pressure detection cavities 14 are respectively detected through the pressure detection ends 15, signals are transmitted to the signal processor 2 to carry out ratio operation on the fluid pressures in the two pressure detection cavities 14, the pressure difference of the fluid in the two pressure detection cavities 14 is obtained, a momentum pressure difference mathematical model is established, and the fluid momentum is obtained through calculation.
The structure of the differential pressure sensor probe 11 can be in various forms, such as: the probe structure of the double-piston double-optical-fiber-beam differential pressure sensor, the probe structure of the single-optical-fiber-beam double-piston-rod differential pressure sensor, the probe structure of the free double-probe differential pressure sensor and the probe structure of the single-piston double-optical-fiber-beam differential pressure sensor in the figure 2 are patent technologies which have been applied by the applicant before and are public technologies.
Claims (2)
1. A momentum-based flow sensing detection method is characterized by comprising the following steps:
the sensor probe (1) comprises a differential pressure sensor probe (11), a detection box (12) with a fluid circulation passage and an air source (13);
the differential pressure sensor probe (11) is provided with two pressure detection cavities (14), the detection box (12) and the two pressure detection cavities (14) are respectively communicated through a fluid passage (18), the air source (13) is used for injecting air towards the middle position of the two fluid passages (18), and the fluid passage (18) and the air source (13)The pressure detection end (15) detects that the pressure difference between the two chambers is zero; if a fluid to be detected flows in the detection box (12), the air source (13) is started to blow air to form air flow, the fluid to be detected and the air flow interact in the detection box (12), so that the initial momentum of the fluid to be detected and the air flow is changed, the mixed fluid deviates in the detection box (12), so that the mixed fluid entering the two pressure detection cavities (14) forms pressure difference in the two pressure detection cavities (14), the fluid pressures in the two pressure detection cavities (14) are respectively detected through the pressure detection ends (15), signals are transmitted to the signal processor (2) to carry out ratio operation on the fluid pressures in the two pressure detection cavities (14), the pressure difference of the fluid in the two pressure detection cavities (14) is obtained, a pressure difference mathematical model is established, and the fluid momentum is obtained through calculation; the momentum pressure difference mathematical model is as follows: analyzing the relationship between the transmission quantity and the pressure difference, and setting the speed of the air flow as VsThe velocity of the measured fluid is V, wherein VsThe air flow speed emitted by the air source (13) is a known quantity, and a pressure difference and the momentum M of two fluids are formed in the two pressure detection cavities (14)sRelated to/M, where M is the momentum of the fluid being measured, MsMomentum of air flow, respectively
And V2Is in direct proportion;
M＝kV2；
namely:
then:
wherein k is1The value of V can be determined after knowing Δ P by knowing the quantity.
2. The momentum flow sensing detection method according to claim 1, wherein: the air injection direction of the air source (13) is vertical to the flow direction of the fluid in the detection box (12).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610367306.XA CN105910660B (en) | 2016-05-30 | 2016-05-30 | Momentum type flow sensor and detection method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610367306.XA CN105910660B (en) | 2016-05-30 | 2016-05-30 | Momentum type flow sensor and detection method thereof |
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| CN105910660B true CN105910660B (en) | 2020-03-24 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104389581A (en) * | 2014-09-17 | 2015-03-04 | 中国石油大学(北京) | Underground fluid induction device and fluid flow velocity measuring system using same |
| CN105021343A (en) * | 2015-07-10 | 2015-11-04 | 贵州大学 | Single fiber bundle probe differential pressure sensor |
| CN105043649A (en) * | 2015-07-10 | 2015-11-11 | 贵州大学 | Probe structure of single fiber bundle differential pressure sensor |
| CN205679275U (en) * | 2016-05-30 | 2016-11-09 | 贵州大学 | A kind of momentum-type flow sensor |
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2016
- 2016-05-30 CN CN201610367306.XA patent/CN105910660B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104389581A (en) * | 2014-09-17 | 2015-03-04 | 中国石油大学(北京) | Underground fluid induction device and fluid flow velocity measuring system using same |
| CN105021343A (en) * | 2015-07-10 | 2015-11-04 | 贵州大学 | Single fiber bundle probe differential pressure sensor |
| CN105043649A (en) * | 2015-07-10 | 2015-11-11 | 贵州大学 | Probe structure of single fiber bundle differential pressure sensor |
| CN205679275U (en) * | 2016-05-30 | 2016-11-09 | 贵州大学 | A kind of momentum-type flow sensor |
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