CN117452020A - Measuring device for on-line measuring fluid flow velocity in pipeline - Google Patents
Measuring device for on-line measuring fluid flow velocity in pipeline Download PDFInfo
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- CN117452020A CN117452020A CN202311166687.1A CN202311166687A CN117452020A CN 117452020 A CN117452020 A CN 117452020A CN 202311166687 A CN202311166687 A CN 202311166687A CN 117452020 A CN117452020 A CN 117452020A
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- 239000012530 fluid Substances 0.000 title claims abstract description 56
- 238000005259 measurement Methods 0.000 claims description 18
- 230000000087 stabilizing effect Effects 0.000 claims description 11
- 238000001514 detection method Methods 0.000 abstract description 17
- 238000000034 method Methods 0.000 description 7
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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- 239000010437 gem Substances 0.000 description 1
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- 239000012535 impurity Substances 0.000 description 1
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- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/14—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring differences of pressure in the fluid
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Abstract
The invention discloses a measuring device for measuring the flow rate of fluid in a pipeline on line, wherein the pipeline comprises a variable-diameter section and a non-variable-diameter section, and the measuring device comprises a constant pressure box for conveying fluid medium into the non-variable-diameter section and the variable-diameter section of the pipeline according to preset pressure P0; the first sensor measures the pressure difference delta P1 between the inlet end and the outlet end of the first pipeline to obtain a first detection value; the constant pressure box conveys fluid medium into the reducing section of the pipeline according to a second preset pressure P0'; the second sensor measures the pressure difference delta P1' between the inlet end and the outlet end of the second pipeline to obtain a second detection value; the data processing module is used for processing the preset pressure P0, the first detection value and the second detection value according to a formulaThe fluid flow rate within the conduit is calculated. The measuring device provided by the embodiment of the invention can be used for enlarging the application range, prolonging the service life and improving the measuring reliability.
Description
Technical Field
The invention relates to the field of flow velocity measurement, in particular to a measuring device for measuring the flow velocity of fluid in a pipeline on line.
Background
In the related art, the flow rate of the gas or the liquid in the pipeline is usually required to directly flow through the measuring device, which leads to the fact that the measuring device needs to be in direct contact with the gas or the liquid to be measured, while the part of the gas or the liquid to be measured in the pipeline in the related art is in the characteristics of high temperature, high humidity, corrosion, dust and the like, which easily causes the damage of the measuring device in the long-term measuring process, reduces the reliability of the measuring device and shortens the service life.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, an object of the present invention is to propose a measuring device for measuring the flow rate of a fluid in a pipe on line. The measuring device adopts non-contact measurement, and can effectively avoid direct contact with fluid to be measured, thereby enlarging the application range, prolonging the service life and improving the measurement reliability.
According to the measuring device for measuring the flow rate of the fluid in the pipeline on line, the constant pressure box is used for conveying the fluid medium into the non-reducing section and the reducing section of the pipeline according to the preset pressure P0; the inlet end of the first pipeline is connected with the constant pressure box, and the outlet end of the first pipeline is connected with the non-reducing section of the pipeline; the inlet end of the second pipeline is connected with the constant pressure box, and the outlet end of the second pipeline is connected with the reducing section of the pipeline; the first sensor is arranged on the first pipeline, the second sensor is arranged on the second pipeline, and the first sensor and the second sensor are respectively used for measuring the pressure difference delta P1 between the inlet end and the outlet end of the first pipeline and the pressure difference delta P1' between the inlet end and the outlet end of the second pipeline; the temperature and humidity sensor is connected with the pipeline to detect the temperature and humidity in the pipeline; the data processing module is used for pre-storing a preset formula in the data processing module and is respectively communicated with the constant pressure box, the first sensor and the second sensor to calculate the fluid flow velocity in the pipeline according to the preset formula, wherein the preset formula is that。
According to the measuring device for measuring the flow rate of the fluid in the pipeline on line, the constant pressure box and the constant pressure box are arranged, the constant pressure box is used for respectively leading the fluid medium into the non-reducing section and the reducing section of the pipeline to be measured according to the preset pressure, the differential pressure in the first pipeline and the second pipeline is detected, and then the flow rate of the fluid in the pipeline to be measured is obtained through the data processing module according to the Bernoulli equation.
According to some embodiments of the invention, the fluid flow is。
According to some embodiments of the invention, the pressure difference between the constant pressure tank and the non-diameter-variable section of the pipe is δp1, and the pressure difference between the constant pressure tank and the diameter-variable section of the pipe is δp1', where 100 pa+.δp1+.15000 Pa,100 pa+.δp1' +.15000 Pa.
According to some embodiments of the invention, the pressure stabilizing device is a flow resistance or air resistance or a spiral tube.
According to some embodiments of the invention, the first sensor and the second sensor are respectively micro pressure difference sensors, and the measurement accuracy of the micro pressure difference sensors is between 0.01pa and 0.1 pa.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of a measurement device for online measurement of fluid flow rate in a pipe according to an embodiment of the invention;
reference numerals:
a measuring device 100;
a constant pressure tank 11; a constant pressure tank 12; a controller 13;
a first sensor 21; a second sensor 22;
a first voltage stabilizing device 31, a second voltage stabilizing device 32, a data processing module 40; a temperature and humidity sensor 50;
a conduit 200; reducing section 210, non-reducing section 220.
Description of the embodiments
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
A measuring device 100 for measuring the flow rate of a fluid in a pipe on-line according to an embodiment of the first aspect of the invention is described below with reference to the accompanying drawings.
As shown in fig. 1, a measuring device 100 for measuring a flow rate of a fluid in a pipe on line according to an embodiment of the present invention includes a constant pressure tank 11, a first sensor 21, a second sensor 22, and first and second pipes. The pipe 200 to be measured includes a reducing section 210 and a non-reducing section 220, and it is understood that the reducing section 210 may be a reducing section 210 preset for the pipe 200, or a reducing section 210 added at a later stage for measuring the flow rate in the pipe 200, and the pipe may be to be measured in industrial fields such as clean room temperature gas, dust-containing gas, high temperature and high humidity gas, and high corrosion fluid transportation.
The constant pressure tank 11 is communicated with the non-reducing section 220 of the pipeline 200 to be tested through a first pipeline, namely, the inlet end of the first pipeline is connected with the constant pressure tank 11, the outlet end of the first pipeline is connected with the non-reducing section 220 of the pipeline 200, and the constant pressure tank 11 is configured to convey fluid medium into the non-reducing section 220 of the pipeline 200 according to a first preset pressure P0;
also, the constant pressure tank 12 is communicated with the variable diameter section 210 of the pipe 200 to be measured through a second pipe, that is, an inlet end of the second pipe is connected with the constant pressure tank 12, and an outlet end is connected with the variable diameter section 210 of the pipe 200, and the constant pressure tank 12 is configured to convey the fluid medium into the non-variable diameter section 220 of the pipe 200 according to a second preset pressure P0', wherein the first preset pressure P0 is greater than the pressure in the non-variable diameter section 220 of the pipe 200, and the second preset pressure P0' is greater than the pressure in the variable diameter section 210. Those skilled in the art can make an adaptive selection based on the fluid within the pipe 200 to be tested;
the first sensor 21 is arranged on the first pipeline, the second sensor 22 is arranged on the second pipeline, and the first sensor 21 and the second sensor 22 are respectively used for measuring the pressure difference delta P1 between the inlet end and the outlet end of the first pipeline and the pressure difference delta P1' between the inlet end and the outlet end of the second pipeline;
the temperature and humidity sensor is connected with the pipeline to detect the temperature and humidity in the pipeline;
the data processing module is pre-stored with a preset formula which is calculated by the following formula
Measured pipe flow q=v1a1=v2a2 (1)
A1 and A2 are the cross-sectional areas of C, D, and V1 and V2 are C, D cross-sectional fluid speeds.
=/> （2）
Obtained by combining the formulas (1) and (2), wherein the preset formula is(3) Wherein P0 is a preset pressure, P1 is the pressure of the outlet end of the first pipeline, ρ is the fluid density in the pipeline, A 1 P2 is the pressure of the outlet end of the second pipeline, A 2 For the cross-sectional area of the variable diameter section of the pipe, p1=p0- δp1, p2=p0- δp1'.
Further, the method comprises the steps of,
the data processing module 40 is respectively connected with the constant pressure tank 11, the first sensor 21 and the second sensor 22, so as to obtain a preset pressure P0 of the constant pressure tank 11, a first detection value of the first sensor 21, a second detection value of the second sensor 22, and a temperature and humidity condition, and according to a preset formula (3), a fluid flow rate in the non-reducing section 220 of the pipe 200 to be measured can be calculated and obtained.
Therefore, according to the measuring device 100 for measuring the fluid flow rate in the pipeline 200 according to the embodiment of the invention, by arranging the constant pressure tank 11 and the constant pressure tank 12, the constant pressure tank 11 is utilized to introduce the fluid medium into the non-reducing section 220 and the reducing section 210 of the pipeline 200 to be measured according to the first preset pressure and the second preset pressure, and detect the differential pressure or the fluid medium flow rate in the first pipeline and the second pipeline, and further calculate the fluid flow rate in the pipeline 200 to be measured according to the bernoulli equation through the data processing module 40, compared with the scheme that the fluid in the pipeline 200 to be measured needs to pass through the measuring device 100 to realize detection in the related art, the non-contact detection of the measuring device 100 is realized, the damage of the fluid in the pipeline 200 to the measuring device 100 can be effectively avoided, and the service life and reliability of the measuring device 100 are prolonged.
As shown in fig. 1, in some embodiments of the present invention, in order to ensure that the pressures in the first pipe, the second pipe, and the pipe 200 to be measured are both within a safe range, and at the same time, the measurement accuracy of the sensors may be ensured, the differential pressure δp1 between the constant pressure tank 11 and the non-diameter-variable section 220 of the pipe 200 is between 100Pa and 15000Pa, for example, δp1 may be 100Pa, 300Pa, 3000Pa, or 15000Pa, the differential pressure between the constant pressure tank 12 and the diameter-variable section 210 of the pipe 200 may be δp1 'between 100Pa and 15000Pa, for example, δp1' may be 100Pa, 300Pa, 3000Pa, or 30000Pa, and it may be understood that the measurement accuracy requirements for the first sensor 21 and the second sensor 22 may be higher and may easily cause an increase in detection error when the differential pressure δp1 'is greater than 15000Pa, and that the differential pressure in the first pipe and the second pipe may also cause a certain potential safety hazard when the differential pressure δp1' is greater than 15000Pa.
In some examples of the present invention, in order to ensure stable measurement results, pressure stabilizing devices are respectively disposed on the first pipeline and the second pipeline, for example, in fig. 1, the first pressure stabilizing device 31 is disposed between the first sensor 21 and the non-reducing section 220 of the pipeline 200, and the second pressure stabilizing device 32 is disposed between the second sensor 22 and the reducing section 210 of the pipeline 200, however, the pressure stabilizing devices may also be disposed between the first sensor 21 and the constant pressure tank 11, and between the second sensor 22 and the constant pressure tank 11, respectively.
Alternatively, the pressure stabilizing device may be an air resistor, a flow resistor, a spiral pipe, or the like, for example, in the example shown in fig. 1, the pressure stabilizing device is a high-precision jewel air resistor, so as to ensure that the pressures in the first pipeline and the second pipeline are stable.
According to an embodiment of the present invention, in order to reduce the influence of high temperature, high humidity, high pressure, impurities, etc. in the fluid medium on the detection results of the first sensor 21 and the second sensor 22, the measuring apparatus 100 further includes at least one of a temperature control assembly, a humidity control assembly, a filter assembly, and a pressure control assembly, which may be disposed upstream of the constant pressure tank 11 and the constant pressure tank 12, or between the constant pressure tank 11 and the first sensor 21 and between the constant pressure tank 12 and the second sensor 22, thereby ensuring that the fluid medium is pretreated before entering the first sensor 21 and the second sensor 22, thereby ensuring the detection reliability.
A method of measuring the flow rate of a fluid in a conduit according to an embodiment of the second aspect of the invention is described below with reference to figure 1. The measuring method can be applied to fluid flow rate measurement in industrial occasions such as clean normal temperature gas, dust-containing gas, high temperature and high humidity gas, high corrosion fluid transportation and the like.
According to a second aspect of the present invention, a method for measuring a fluid flow rate in a pipeline according to the above embodiment of the present invention includes the steps of:
s1, conveying fluid medium into a non-reducing section and a reducing section of a pipeline according to preset pressure P0;
s2, measuring the pressure difference delta P1 between the inlet end and the outlet end of the first pipeline to obtain a first detection value, and measuring the pressure difference delta P1 between the inlet end and the outlet end of the second pipeline to obtain a second detection value;
and S3, calculating the fluid flow rate in the pipeline according to the preset pressure P0, the first detection value and the second detection value.
In step S3, if the differential pressure δp1 and the differential pressure δp1' are detected in step S2, the flow rate of the fluid in the pipe to be measured may be represented by the formulaCalculating, wherein P0 is preset pressure, P1 is pressure of an outlet end of the first pipeline, ρ is fluid density in the pipeline, A 1 P2 is the pressure of the outlet end of the second pipeline, A 2 For the cross-sectional area of the variable diameter section of the pipe, p1=p0- δp1, p2=p0- δp1'.
According to the method for measuring the flow rate of the fluid in the pipeline, the pressure difference between the inlet end and the outlet end of the first pipeline and the second pipeline is measured by conveying the fluid medium into the pipeline according to the preset pressure P0, so that the flow rate of the fluid in the pipeline is calculated according to the preset pressure P0, the first detection value and the second detection value.
In the description of the invention, a "first feature" or "second feature" may include one or more of such features.
In the description of the present invention, "plurality" means two or more.
In the description of the invention, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by another feature therebetween.
In the description of the invention, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature.
Other construction examples and the like and operations of the measuring device and the measuring method for measuring the flow rate of the fluid in the pipe on line according to the embodiment of the present invention are known to those skilled in the art, and will not be described in detail herein.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (6)
1. A measurement device for on-line measuring a fluid flow rate in a conduit, the conduit comprising a variable diameter section and a non-variable diameter section, comprising:
the constant pressure box is used for conveying fluid media into the non-reducing section and the reducing section of the pipeline according to preset pressure P0;
the inlet end of the first pipeline is connected with the constant pressure box, and the outlet end of the first pipeline is connected with the non-reducing section of the pipeline;
the inlet end of the second pipeline is connected with the constant pressure box, and the outlet end of the second pipeline is connected with the reducing section of the pipeline;
the first sensor is arranged on the first pipeline, the second sensor is arranged on the second pipeline, and the first sensor and the second sensor are respectively used for measuring the pressure difference delta P1 between the inlet end and the outlet end of the first pipeline and the pressure difference delta P1' between the inlet end and the outlet end of the second pipeline;
the temperature and humidity sensor is connected with the pipeline to detect the temperature and humidity in the pipeline;
the data processing module is used for pre-storing a preset formula in the data processing module and is respectively communicated with the constant pressure box, the first sensor and the second sensor to calculate the fluid flow velocity in the pipeline according to the preset formula, wherein the preset formula is thatWherein P0 is a preset pressure, P1 is the pressure of the outlet end of the first pipeline, ρ is the fluid density in the pipeline, A 1 P2 is the pressure of the outlet end of the second pipeline, A 2 Is the cross-sectional area of the reducing section of the conduit.
2. The apparatus for on-line measurement of fluid flow rate in a conduit according to claim 1, wherein the fluid flow is。
3. The measurement device for online measurement of a flow rate of a fluid in a pipe according to claim 2, wherein a pressure difference between the constant pressure tank and a non-diameter-variable section of the pipe is δp1, and a pressure difference between the constant pressure tank and the diameter-variable section of the pipe is δp1', wherein 100 pa+.δp1+.ltoreq.15000 Pa,100 pa+.ltoreq.δp1' +.ltoreq.15000 Pa.
4. The device for on-line measurement of the flow rate of a fluid in a pipe according to claim 1, wherein the first and second pipes are provided with pressure stabilizing devices, respectively, which are provided between the first sensor and the non-diameter-changing section of the pipe and between the second sensor and the diameter-changing section of the pipe or between the first sensor and the constant pressure tank and between the second sensor and the constant pressure tank, respectively.
5. The device for on-line measurement of the flow rate of a fluid in a conduit according to claim 4, wherein the pressure stabilizing means is a flow resistance or an air resistance or a spiral tube.
6. The device for on-line measurement of fluid flow rate in a conduit according to any one of claims 1-5, wherein the first sensor and the second sensor are each a differential pressure sensor having a measurement accuracy of between 0.01pa and 0.1 pa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311166687.1A CN117452020A (en) | 2023-09-12 | 2023-09-12 | Measuring device for on-line measuring fluid flow velocity in pipeline |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311166687.1A CN117452020A (en) | 2023-09-12 | 2023-09-12 | Measuring device for on-line measuring fluid flow velocity in pipeline |
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| CN117452020A true CN117452020A (en) | 2024-01-26 |
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| CN202311166687.1A Pending CN117452020A (en) | 2023-09-12 | 2023-09-12 | Measuring device for on-line measuring fluid flow velocity in pipeline |
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