阅读说明：本技术 用于测量管道内流体流速的测量装置及测量方法 (Measuring device and measuring method for measuring flow velocity of fluid in pipeline ) 是由 卓宇轩 张智博 于 2019-12-24 设计创作，主要内容包括：本发明公开了一种用于测量管道内流体流速的测量装置及测量方法,管道包括变径段以及非变径段,测量装置包括第一压力源按照第一预设压力P0向管道的非变径段内输送流体介质；第一传感器测量第一管路的进口端与出口端的压差δP1或者用于测量第一管路内的流体介质流速V0以得到第一检测值；第二压力源按照第二预设压力P0’向管道的变径段内输送流体介质；第二传感器测量第二管路的进口端与出口端的压差δP1’或者测量第二管路内的流体介质流速V0’以得到第二检测值；数据处理模块根据第一预设压力P0、第二预设压力P0’、第一检测值以及第二检测值计算管道内的流体流速。根据本发明实施例的测量装置可以增大适用范围、延长使用寿命及提高测量可靠性。(The invention discloses a measuring device and a measuring method for measuring the flow velocity of fluid in a pipeline, wherein the pipeline comprises a reducing section and a non-reducing section, and the measuring device comprises a first pressure source, a second pressure source and a third pressure source, wherein the first pressure source conveys fluid media into the non-reducing section of the pipeline according to a first preset pressure P0; the first sensor measures the pressure difference deltaP 1 between the inlet end and the outlet end of the first pipeline or measures the flow velocity V0 of the fluid medium in the first pipeline to obtain a first detection value; the second pressure source 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 or measures the flow velocity V0' of the fluid medium in the second pipeline to obtain a second detection value; the data processing module calculates the flow rate of the fluid in the pipeline according to the first preset pressure P0, the second preset pressure P0', the first detection value and the second detection value. The measuring device provided by the embodiment of the invention can enlarge the application range, prolong the service life and improve the measurement reliability.)

1. A measuring device for measuring the flow rate of a fluid in a pipe, the pipe comprising a tapered section and a non-tapered section, comprising:

a first pressure source for delivering fluid medium into the non-tapered section of the conduit at a first preset pressure P0, wherein the first preset pressure P0 is greater than the pressure in the non-tapered section of the conduit;

a first conduit having an inlet end connected to the first pressure source and an outlet end connected to the non-reducer section of the pipe;

the first sensor is arranged on the first pipeline and used for measuring the pressure difference deltaP 1 between the inlet end and the outlet end of the first pipeline or measuring the flow velocity V0 of the fluid medium in the first pipeline to obtain a first detection value;

a second pressure source for delivering fluid medium into the reducer section of the pipe at a second predetermined pressure P0 ', wherein the second predetermined pressures P0' are each greater than the pressure in the reducer section of the pipe;

a second pipeline, an inlet end of the second pipeline being connected to the second pressure source and an outlet end of the second pipeline being connected to the reducer section of the pipeline;

the second sensor is arranged on the second pipeline and is used for measuring the pressure difference deltaP 1 'between the inlet end and the outlet end of the second pipeline or measuring the flow velocity V0' of the fluid medium in the second pipeline to obtain a second detection value;

a data processing module in communication with the first pressure source, the second pressure source, the first sensor, and the second sensor, respectively, to calculate a fluid flow rate within the conduit based on the first preset pressure P0, the second preset pressure P0', the first sensed value, and the second sensed value.

2. A measuring device for measuring the flow rate of a fluid in a conduit according to claim 1, wherein the pressure difference between the first pressure source and the non-tapered section of the conduit is δ P1 and the pressure difference between the second pressure source and the tapered section of the conduit is δ P1', wherein 30Pa δ P1 30000Pa and 30Pa δ P1' 30000 Pa.

3. The apparatus of claim 1, wherein the first pressure source and the second pressure source are the same pressure source, and the first predetermined pressure is equal to the second predetermined pressure.

4. The apparatus according to claim 1, wherein the first and second pipes are provided with pressure-stabilizing means respectively between the first sensor and the non-variable-diameter section of the pipe and between the second sensor and the variable-diameter section of the pipe or between the first sensor and the first pressure source and between the second sensor and the second pressure source.

5. A measuring device for measuring the flow rate of a fluid in a conduit according to claim 4, wherein the pressure stabilizing means is a flow or air resistance or a coil.

6. The apparatus of claim 4, wherein the first sensor and the second sensor are pressure sensors, the first sensor is used for measuring a pressure difference δ P1 between the inlet end and the outlet end of the first pipeline, and the second sensor is used for measuring a pressure difference δ P1' between the inlet end and the outlet end of the second pipeline,

wherein P0 is a first preset pressure, δ P1 is a pressure difference between an inlet end and an outlet end of the first pipeline, ρ is a density of the fluid in the pipeline, A₁Is the cross-sectional area of the non-tapered section of the pipe, v1 is the fluid flow rate within the non-tapered section of the pipe, P0 'is the second predetermined pressure, δ P1' is the pressure differential between the inlet and outlet ends of the second pipeline, a₂Is the cross-sectional area of the reducer section of the pipe.

7. The apparatus as claimed in claim 4, wherein the first sensor and the second sensor are flow sensors, the first sensor is used for measuring the flow velocity V0 of the fluid medium in the first pipeline, the second sensor is used for measuring the flow velocity V0' of the fluid medium in the second pipeline,

wherein P0 is a first preset pressure, P1 is the pressure at the outlet end of the first pipeline, ρ₀The density of the fluid medium in the first pipeline and the second pipeline is shown, rho is the density of the fluid in the pipeline, A₁Is the cross-sectional area of the non-tapered section of the pipe, v1 is the fluid flow rate in the non-tapered section of the pipe, P0 'is the second predetermined pressure, P1' is the pressure at the outlet end of the second line, a₂H1 is the cross-sectional area of the variable diameter section of the pipeline, and H2 is the flow resistance in the first pipeline.

8. The measurement device of any one of claims 1 to 7, further comprising a pre-processing assembly disposed upstream of the first and second pressure sources, respectively, the pre-processing assembly comprising at least one of a temperature control assembly, a humidity control assembly, a filtration assembly and a pressure control assembly.

9. A method of measuring the flow rate of a fluid in a pipe, using a measuring device according to any one of claims 1 to 8 for measuring the flow rate of a fluid in a pipe, comprising the steps of:

s1, delivering fluid medium into the non-reducing section of the pipeline according to a first preset pressure P0, and delivering fluid medium into the reducing section of the pipeline according to a second preset pressure P0';

s2, measuring the pressure difference delta P1 between the inlet end and the outlet end of the first pipeline or measuring the flow velocity V0 of the fluid medium in 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 or measuring the flow velocity V0' of the fluid medium in the second pipeline to obtain a second detection value;

s3, calculating the fluid flow rate in the pipeline according to the first preset pressure P0, the second preset pressure P0', the first detection value and the second detection value.

10. The method for measuring the flow rate of fluid in a pipe according to claim 9, wherein the step S3 includes:

s31, if the pressure difference delta P1 and the pressure difference delta P1' are detected in the step S2, the flow speed V1 of the fluid in the non-reducing section of the pipeline passes through the formula

s32, if the flow velocity V0 of the fluid medium in the first pipeline and the flow velocity V0' of the fluid medium in the second pipeline are detected in the step S2, the flow velocity V1 in the non-reducing section of the pipeline is determined according to the following formula:

wherein P0 is a first preset pressure, P1 is the pressure at the outlet end of the first pipeline, ρ₀The density of the fluid medium in the first pipeline and the second pipeline is shown, rho is the density of the fluid in the pipeline, A₁Is the cross-sectional area of the non-tapered section of the pipe, v1 is the fluid flow rate in the non-tapered section of the pipe, P0 'is the second predetermined pressure, P1' is the pressure at the outlet end of the second line, a₂H1 is the flow resistance in the first pipeline, H2 is the flow resistance in the second pipeline, deltaP 1 is the pressure difference between the inlet end and the outlet end of the first pipeline, and deltaP 1' is the pressure difference between the inlet end and the outlet end of the second pipeline.

Technical Field

The invention relates to the field of flow velocity measurement, in particular to a measuring device and a measuring method for measuring the flow velocity of fluid in a pipeline.

Background

Disclosure of Invention

The present invention is directed to solving at least one of the problems of 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. The measuring device adopts non-contact measurement, and can effectively avoid direct contact with the fluid to be measured, thereby enlarging the application range, prolonging the service life and improving the measurement reliability.

The invention also provides a method for measuring the flow velocity of the fluid in the pipeline by adopting the device for measuring the flow velocity of the fluid in the pipeline.

According to a first aspect of the present invention, a measuring device for measuring a flow rate of a fluid in a pipe, the pipe including a variable diameter section and a non-variable diameter section, the measuring device includes: a first pressure source for delivering fluid medium into the non-tapered section of the conduit at a first preset pressure P0, wherein the first preset pressure P0 is greater than the pressure in the non-tapered section of the conduit; a first conduit having an inlet end connected to the first pressure source and an outlet end connected to the non-reducer section of the pipe; the first sensor is arranged on the first pipeline and used for measuring the pressure difference deltaP 1 between the inlet end and the outlet end of the first pipeline or measuring the flow velocity V0 of the fluid medium in the first pipeline to obtain a first detection value; a second pressure source for delivering fluid medium into the reducer section of the pipe at a second predetermined pressure P0 ', wherein the second predetermined pressures P0' are each greater than the pressure in the reducer section of the pipe; a second pipeline, an inlet end of the second pipeline being connected to the second pressure source and an outlet end of the second pipeline being connected to the reducer section of the pipeline; the second sensor is arranged on the second pipeline and is used for measuring the pressure difference deltaP 1 'between the inlet end and the outlet end of the second pipeline or measuring the flow velocity V0' of the fluid medium in the second pipeline to obtain a second detection value; a data processing module in communication with the first pressure source, the second pressure source, the first sensor, and the second sensor, respectively, to calculate a fluid flow rate within the conduit based on the first preset pressure P0, the second preset pressure P0', the first sensed value, and the second sensed value.

According to the measuring device for measuring the flow velocity of the fluid in the pipeline, by arranging the first pressure source and the second pressure source, the fluid medium is respectively introduced into the non-reducing section and the reducing section of the pipeline to be measured by utilizing the first pressure source and the second pressure source according to the first preset pressure and the second preset pressure, the pressure difference or the flow velocity of the fluid medium in the first pipeline and the second pipeline is detected, and then the flow velocity of the fluid in the pipeline to be measured is calculated by the data processing module according to the Bernoulli equation.

According to some embodiments of the invention, the pressure differential between the first pressure source and the non-reducer section of the conduit is δ P1, and the pressure differential between the second pressure source and the reducer section of the conduit is δ P1', wherein 30Pa ≦ δ P1 ≦ 30000Pa, and 30Pa ≦ δ P1' ≦ 30000 Pa.

According to some embodiments of the invention, the first pressure source and the second pressure source are the same pressure source, and the first preset pressure is equal to the second preset pressure.

According to some embodiments of the invention, the first and second pipes are provided with pressure stabilizing means respectively between the first sensor and the non-variable diameter section of the pipe and between the second sensor and the variable diameter section of the pipe or between the first sensor and the first pressure source and between the second sensor and the second pressure source.

According to some embodiments of the invention, the pressure stabilizing device is a flow or air resistance or a solenoid.

Some according to the inventionIn an embodiment, the first sensor and the second sensor are pressure sensors, the first sensor is used for measuring a pressure difference deltaP 1 between the inlet end and the outlet end of the first pipeline and the second sensor is used for measuring a pressure difference deltaP 1' between the inlet end and the outlet end of the second pipeline,

wherein P0 is a first preset pressure, δ P1 is a pressure difference between an inlet end and an outlet end of the first pipeline, ρ is a density of the fluid in the pipeline, A₁Is the cross-sectional area of the non-tapered section of the pipe, v1 is the fluid flow rate within the non-tapered section of the pipe, P0 'is the second predetermined pressure, δ P1' is the pressure differential between the inlet and outlet ends of the second pipeline, a₂Is the cross-sectional area of the reducer section of the pipe.

According to some embodiments of the invention, the first sensor for measuring the flow velocity V0 of the fluid medium in the first line and the second sensor for measuring the flow velocity V0' of the fluid medium in the second line are both flow sensors,

wherein P0 is a first preset pressure, P1 is the pressure at the outlet end of the first pipeline, ρ₀The density of the fluid medium in the first pipeline and the second pipeline is shown, rho is the density of the fluid in the pipeline, A₁Is the cross-sectional area of the non-tapered section of the pipe, v1 is the fluid flow rate in the non-tapered section of the pipe, P0 'is the second predetermined pressure, P1' is the pressure at the outlet end of the second line, a₂H1 is the cross-sectional area of the variable diameter section of the pipeline, and H2 is the flow resistance in the first pipeline.

According to some embodiments of the invention, the measuring device for measuring a flow rate of a fluid in a pipe further comprises a pre-processing assembly disposed upstream of the first pressure source and the second pressure source, respectively, the pre-processing assembly comprising at least one of a temperature control assembly, a humidity control assembly, a filter assembly, and a pressure control assembly.

According to the measuring method of the fluid flow rate in the pipeline in the embodiment of the second aspect of the invention, the measuring method adopting the measuring device for measuring the fluid flow rate in the pipeline comprises the following steps: s1, delivering fluid medium into the non-reducing section of the pipeline according to a first preset pressure P0, and delivering fluid medium into the reducing section of the pipeline according to a second preset pressure P0'; s2, measuring the pressure difference delta P1 between the inlet end and the outlet end of the first pipeline or measuring the flow velocity V0 of the fluid medium in the first pipeline to obtain a first detection value, measuring the pressure difference delta P1' between the inlet end and the outlet end of the second pipeline or measuring the flow velocity V0 ' of the fluid medium in the second pipeline to obtain a second detection value, and S3, calculating the flow velocity of the fluid in the pipeline according to the first preset pressure P0, the second preset pressure P0 ', the first detection value and the second detection value.

According to the method for measuring the flow rate of the fluid in the pipeline, the fluid medium is conveyed into the non-reducing section of the pipeline according to the first preset pressure P0, the fluid medium is conveyed into the reducing section of the pipeline according to the second preset pressure P0 ', and the pressure difference between the inlet end and the outlet end of the first pipeline and the second pipeline or the flow rate of the fluid medium in the first pipeline is measured, so that the flow rate of the fluid in the pipeline is calculated according to the first preset pressure P0, the second preset pressure P0', the first detection value and the second detection value.

According to some embodiments of the invention, step S3 includes: s31, if the pressure difference delta P1 and the pressure difference delta P1' are detected in the step S2, the flow speed V1 of the fluid in the non-reducing section of the pipeline passes through the formula

Calculated, S32, if the flow speed V0 of the fluid medium in the first pipeline is detected in the step S2And the flow velocity V0' of the fluid medium in the second pipeline, the flow velocity V1 of the fluid in the non-reducing section of the pipeline is determined by the formula:

calculating to obtain the pressure P0, P1 and P₀The density of the fluid medium in the first pipeline and the second pipeline is shown, rho is the density of the fluid in the pipeline, A₁Is the cross-sectional area of the non-tapered section of the pipe, v1 is the fluid flow rate in the non-tapered section of the pipe, P0 'is the second predetermined pressure, P1' is the pressure at the outlet end of the second line, a₂H1 is the flow resistance in the first pipeline, H2 is the flow resistance in the second pipeline, deltaP 1 is the pressure difference between the inlet end and the outlet end of the first pipeline, and deltaP 1' is the pressure difference between the inlet end and the outlet end of the second pipeline.

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 above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic view of a measurement device for measuring the flow rate of a fluid in a conduit according to an embodiment of the present invention;

FIG. 2 is a step diagram of a method of measuring fluid flow rate in a pipe according to an embodiment of the invention.

Reference numerals:

a measuring device 100;

a first pressure source 11; a second pressure source 12; a controller 13;

a first sensor 21; a second sensor 22;

a first voltage stabilizer 31, a second voltage stabilizer 32, a data processing module 40;

a pipe 200; a variable diameter section 210 and a non-variable diameter section 220.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

A measuring device 100 for measuring the flow rate of a fluid in a pipe according to an embodiment of the first aspect of the invention is described below with reference to the drawings.

As shown in fig. 1, a measuring apparatus 100 for measuring a flow rate of fluid in a pipe according to an embodiment of the present invention includes a first pressure source 11, a second pressure source 12, a first sensor 21, a second sensor 22, and first and second lines. The pipe 200 to be tested comprises a variable-diameter section 210 and a non-variable-diameter section 220, and it can be understood that the variable-diameter section 210 can be a variable-diameter section 210 preset for the pipe 200, or a variable-diameter section 210 additionally arranged at a later stage for measuring the flow rate in the pipe 200, and industrial occasions such as clean normal-temperature gas, dusty gas, high-temperature high-humidity gas, high-corrosion fluid transportation and the like can be used for testing.

The first pressure source 11 is communicated with the non-variable-diameter section 220 of the pipe 200 to be tested through a first pipeline, namely, the inlet end of the first pipeline is connected with the first pressure source 11, the outlet end of the first pipeline is connected with the non-variable-diameter section 220 of the pipe 200, and the first pressure source 11 is configured to convey fluid media into the non-variable-diameter section 220 of the pipe 200 according to a first preset pressure P0;

similarly, the second pressure source 12 is connected to the variable-diameter section 210 of the pipe 200 to be tested through a second pipeline, that is, the inlet end of the second pipeline is connected to the second pressure source 12, the outlet end of the second pipeline is connected to the variable-diameter section 210 of the pipe 200, and the second pressure source 12 is configured to deliver 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. One skilled in the art can make an adaptive selection based on the fluid in 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 deltaP 1 between the inlet end and the outlet end of the first pipeline or measuring the flow velocity V0 of the fluid medium in the first pipeline to obtain a first detection value and measuring the pressure difference deltaP 1 'between the inlet end and the outlet end of the second pipeline or measuring the flow velocity V0' of the fluid medium in the second pipeline to obtain a second detection value.

Further, the data processing module 40 is connected to the first pressure source 11, the second pressure source 12, the first sensor 21 and the second sensor 22 respectively, so as to obtain a first preset pressure P0 and a second preset pressure P0' of the first pressure source 11 and the second pressure source 12, and a first detection value of the first sensor 21 and a second detection value of the second sensor 22, and further, according to the bernoulli equation, the flow rate of the fluid in the non-variable diameter section 220 of the pipe 200 to be measured can be calculated and obtained.

Thus, the measuring apparatus 100 for measuring the flow rate of fluid in the pipe 200 according to the embodiment of the present invention, by arranging the first pressure source 11 and the second pressure source 12, respectively introducing fluid media into the non-reducing section 220 and the reducing section 210 of the pipeline 200 to be tested according to a first preset pressure and a second preset pressure by using the first pressure source 11 and the second pressure source 12, and detecting the pressure difference or the flow rate of the fluid media in the first pipeline and the second pipeline, and then the data processing module 40 calculates the flow velocity of the fluid in the pipe 200 to be detected according to the bernoulli equation, so that compared with the scheme in the related art that the fluid in the pipe 200 to be detected needs to pass through the measuring device 100 to realize detection, the non-contact detection of the measuring device 100 is realized, the fluid in the pipeline 200 can be effectively prevented from damaging the measuring device 100, and the service life and the reliability of the measuring device 100 are prolonged.

In some embodiments of the present invention, as shown in fig. 1, to ensure that the pressure in the first pipeline, the second pipeline and the pipeline 200 to be measured is in a safe range, and the measurement accuracy of the sensor is ensured, the pressure difference δ P1 between the first pressure source 11 and the non-reducing section 220 of the pipeline 200 is between 30Pa and 30000Pa, for example, δ P1 may be 30Pa, 300Pa, 3000Pa or 30000Pa, and the pressure difference δ P1 'between the second pressure source 12 and the reducing section 210 of the pipeline 200 is also between 30Pa and 30000Pa, for example, δ P1' may be 30Pa, 300Pa, 3000Pa or 30000Pa, it is understood that when the pressure difference δ P1 or δ P1 'is less than 30Pa, the measurement accuracy requirements for the first sensor 21 and the second sensor 22 are high and the detection error is likely to increase, and when the pressure difference δ P1 or δ P1' is greater than 30000Pa, the pressure in the first pipeline and the second pipeline is likely to increase, meanwhile, the pressure in the pipeline 200 to be measured is increased more, and certain potential safety hazards are generated.

As shown in fig. 1, in some embodiments, in order to simplify the structure, reduce the number of components of the measuring apparatus 100, and simplify the calculation process, the first pressure source 11 and the second pressure source 12 may be the same pressure source, and the first preset pressure P0 may be equal to the second preset pressure P0', for example, the first pressure source 11 and the second pressure source 12 may be constant pressure tanks, and the constant pressure tanks may be further provided with a controller 13 to control the preset pressures output by the constant pressure tanks, and the constant pressure tanks are respectively connected to the non-variable diameter section 220 and the variable diameter section 210 of the pipeline 200, and introduce the fluid medium into the non-variable diameter section 220 and the variable diameter section 210 of the pipeline 200 according to the preset pressures.

In some examples of the invention, as shown in fig. 1, in order to ensure a stable measurement result, pressure-stabilizing devices are respectively provided on the first and second pipelines, for example, in fig. 1, the first pressure-stabilizing device 31 is provided between the first sensor 21 and the non-variable diameter section 220 of the pipeline 200, and the second pressure-stabilizing device 32 is provided between the second sensor 22 and the variable diameter section 210 of the pipeline 200, although pressure-stabilizing devices may be provided between the first sensor 21 and the first pressure source 11, and between the second sensor 22 and the second pressure source 12.

Alternatively, the pressure stabilizer may be an air resistor, a flow resistor, a spiral tube, or the like, for example, in the example shown in fig. 1, the pressure stabilizer is a high-precision jewel air resistor, thereby ensuring stable pressure in the first and second pipelines.

In some embodiments of the present invention, the first sensor 21 and the second sensor 22 are pressure sensors, the first sensor 21 is used for measuring a pressure difference δ P1 between the inlet end and the outlet end of the first pipeline, and the second sensor 22 is used for measuring a pressure difference δ P1' between the inlet end and the outlet end of the second pipeline, so that the fluid pressure at the junction of the outlet end of the first pipeline and the non-variable-diameter section 220 (the pressure at point C in fig. 1) is substantially equal to (P0- δ P1), and the fluid pressure at the junction of the outlet end of the second pipeline and the variable-diameter section 210 (the pressure at point D in fig. 1) is substantially equal to (P0 ' - δ P1 '), and further according to bernoulli equation and flow equation (b-r equation)

) Can obtain

Wherein P0 is a first preset pressure, δ P1 is a pressure difference between an inlet end and an outlet end of the first pipeline, ρ is a density of the fluid in the pipeline 200, a₁Is the cross-sectional area of the non-tapered section 220 of the conduit 200, v1 is the fluid flow rate in the non-tapered section 220 of the conduit 200, P0 'is the second predetermined pressure, δ P1' is the pressure difference between the inlet and outlet ends of the second conduit, a₂The cross-sectional area of the reducer section 210 of the pipe 200 is calculated to obtain the flow velocity V1 of the fluid in the non-reducer section 220 of the pipe 200.

In other embodiments of the invention, the first sensor 21 and the second sensor 22 are both flow sensors, the first sensor 21 being arranged to measure the flow velocity V0 of the fluid medium in the first line, and the second sensor 22 being arranged to measure the flow velocity V0' of the fluid medium in the second line, whereby, according to the bernoulli equation,

。

thereby calculating a fluid pressure P1 at the junction of the outlet end of the first line and the non-variable-diameter section 220 (pressure at point C in fig. 1) and a fluid pressure P1' at the junction of the outlet end of the second line and the variable-diameter section 210 (pressure at point D in fig. 1).

Further, in the pipe 200 to be measured, the Bernoulli equation and the flow equation (b) are calculated

) An equation can be obtained

The fluid flow velocity V1 in the non-reducer section 220 of the pipe 200 to be tested can be obtained by combining the equations (1), (2) and (3).

According to the 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 device 100 further includes at least one of a temperature control component, a humidity control component, a filter component, and a pressure control component, and the temperature control component, the humidity control component, the filter component, and the pressure control component may be disposed upstream of the first pressure source 11 and the second pressure source 12, or disposed between the first pressure source 11 and the first sensor 21, and between the second pressure source 12 and the second sensor 22, so as to ensure that the fluid medium is pretreated before entering the first sensor 21 and the second sensor 22, and further ensure the detection reliability.

A method of measuring the flow rate of a fluid in a pipe according to an embodiment of the second aspect of the invention is described below with reference to figures 1 and 2. The measuring method can be applied to the measurement of the flow rate of the fluid in the industrial occasions of clean normal-temperature gas, dusty gas, high-temperature high-humidity gas, high-corrosion fluid delivery and the like.

According to the method for measuring the flow rate of the fluid in the pipeline in the embodiment of the second aspect of the invention, the measuring method adopts the measuring device for measuring the flow rate of the fluid in the pipeline in the embodiment of the invention, and the method specifically comprises the following steps:

s1, delivering fluid medium into the non-reducing section of the pipeline according to a first preset pressure P0, and delivering fluid medium into the reducing section of the pipeline according to a second preset pressure P0';

s2, measuring the pressure difference delta P1 between the inlet end and the outlet end of the first pipeline or measuring the flow velocity V0 of the fluid medium in 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 or measuring the flow velocity V0' of the fluid medium in the second pipeline to obtain a second detection value;

s3, calculating the fluid flow rate in the pipeline according to the first preset pressure P0, the second preset pressure P0', the first detection value and the second detection value.

In step S3, if the pressure difference δ P1 and the pressure difference δ P1' are detected in step S2, the flow rate of the fluid in the pipe to be measured can be determined according to the formula (1)

Calculating, wherein P0 is a first preset pressure, δ P1 is a pressure difference between an inlet end and an outlet end of the first pipeline, ρ is a density of the fluid in the pipeline, and A₁Is the cross-sectional area of the non-tapered section of the pipe, v1 is the fluid flow rate within the non-tapered section of the pipe, P0 'is the second predetermined pressure, δ P1' is the pressure differential between the inlet and outlet ends of the second pipeline, a₂Calculating the sectional area of the variable-diameter section of the pipeline to obtain the flow velocity V1 of fluid in the non-variable-diameter section of the pipeline;

if the flow rate V0 of the fluid medium in the first pipeline and the flow rate V0' of the fluid medium in the second pipeline are detected in step S2, the flow rate of the fluid in the pipeline to be tested can be determined by the following equations (2) to (4):

and (4) calculating. Wherein P0 is a first preset pressure, P1 is the pressure at the outlet end of the first pipeline, ρ₀The density of the fluid medium in the first pipeline and the second pipeline is shown, rho is the density of the fluid in the pipeline, A₁Is the cross-sectional area of the non-tapered section of the pipe, v1 is the fluid flow rate in the non-tapered section of the pipe, P0 'is the second predetermined pressure, P1' is the pressure at the outlet end of the second line, a₂The cross-sectional area of the variable diameter section of the pipeline is H1, the flow resistance in the first pipeline is H2, the flow resistance in the second pipeline is HAnd (4) blocking.

Therefore, according to the method for measuring the flow rate of the fluid in the pipeline provided by the embodiment of the invention, the fluid medium is conveyed into the non-reducing section of the pipeline according to the first preset pressure P0, the fluid medium is conveyed into the reducing section of the pipeline according to the second preset pressure P0 ', and the pressure difference between the inlet end and the outlet end of the first pipeline and the second pipeline or the flow rate of the fluid medium in the first pipeline is measured, so that the flow rate of the fluid in the pipeline is calculated according to the first preset pressure P0, the second preset pressure P0', the first detection value and the second detection value.

In the description of the present invention, "the first feature" and "the second feature" may include one or more of the features.

In the description of the present invention, "a plurality" means two or more.

In the description of the present invention, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, and may also include the first and second features being in contact with each other not directly but through another feature therebetween.

In the description of the invention, "above", "over" and "above" a first feature in a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.

Other configurations and operations of the measuring apparatus and the measuring method for measuring the flow rate of the fluid in the pipe according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail herein.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean 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, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. 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 invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.