Measuring device and measuring method for measuring flow velocity of fluid in pipeline

Abstract

The present invention discloses a measuring device and a measuring method for measuring the flow rate of a fluid in a pipeline. The pipeline includes a variable diameter section and a non-variable diameter section. The measuring device includes a first pressure source that delivers a fluid medium to the non-variable diameter section of the pipeline according to a first preset pressure P0; a first sensor that measures the pressure difference δP1 between the inlet and outlet ends of the first pipeline or is used to measure the flow rate V0 of the fluid medium in the first pipeline to obtain a first detection value; a second pressure source that delivers a fluid medium to the variable diameter section of the pipeline according to a second preset pressure P0'; a second sensor that measures the pressure difference δP1' between the inlet and outlet ends of the second pipeline or measures the flow rate V0' of the fluid medium in the second pipeline to obtain a second detection value; and a data processing module that 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 according to the embodiment of the present invention can increase the scope of application, extend the service life, and improve the measurement reliability.

Description

Technical Field

[0001] The invention relates to the field of flow velocity measurement, and in particular to a measuring device and a measuring method for measuring the flow velocity of a fluid in a pipeline. Background Art

[0002] In the related art, the measurement of gas or liquid flow rate in a pipeline usually requires that the gas or liquid in the pipeline to be measured flow directly through the measuring device, which requires the measuring device to be in direct contact with the gas or liquid to be measured. However, in the related art, the gas or liquid to be measured in the pipeline is partially exposed to high temperature, high humidity, corrosion, dust and other characteristics, which can easily cause damage to the measuring device during long-term measurement, reduce the reliability of the measuring device and shorten its service life. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a measuring device for measuring the flow rate of a fluid in a pipeline. The measuring device adopts non-contact measurement, which can effectively avoid direct contact with the fluid to be measured, thereby expanding the scope of application, extending the service life and improving the measurement reliability.

[0004] The present invention also proposes a method for measuring the flow rate of a fluid in a pipeline using the above-mentioned measuring device for measuring the flow rate of a fluid in a pipeline.

[0005] According to a measuring device for measuring the flow rate of a fluid in a pipeline, the pipeline includes a variable diameter section and a non-variable diameter section, and is characterized in that it includes: a first pressure source, used to transport a fluid medium to the non-variable diameter section of the pipeline according to a first preset pressure P0, wherein the first preset pressure P0 is greater than the pressure in the non-variable diameter section of the pipeline; a first pipeline, wherein the inlet end of the first pipeline is connected to the first pressure source and the outlet end of the first pipeline is connected to the non-variable diameter section of the pipeline; a first sensor, the first sensor is arranged in the first pipeline, and is used to measure the pressure difference δP1 between the inlet end and the outlet end of the first pipeline or to measure the flow rate V0 of the fluid medium in the first pipeline to obtain a first detection value; a second pressure source, used to transport a fluid medium to the variable diameter section of the pipeline according to a second preset pressure P0'. a second pipeline, wherein the inlet end of the second pipeline is connected to the second pressure source and the outlet end of the second pipeline is connected to the reducing section of the pipeline; a second sensor, the second sensor is arranged in the second pipeline, and is used to measure the pressure difference δP1' between the inlet end and the outlet end of the second pipeline or to measure the flow rate V0' of the fluid medium in the second pipeline to obtain a second detection value; a data processing module, the data processing module communicates with the first pressure source, the second pressure source, the first sensor and the second sensor respectively to calculate 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.

[0006] According to the measuring device for measuring the flow rate of a fluid in a pipeline according to an embodiment of the present invention, a first pressure source and a second pressure source are set, and the first pressure source and the second pressure source are used to respectively introduce a fluid medium into the non-variable diameter section and the variable diameter section of the pipeline to be measured according to a first preset pressure and a second preset pressure, and the pressure difference or the flow rate of the fluid medium 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 calculated by a data processing module according to the Bernoulli equation. Compared with the solution in the related art that requires the fluid in the pipeline to be measured to pass through the measuring device to achieve detection, non-contact detection of the measuring device is achieved, which can effectively prevent the fluid in the pipeline from damaging the measuring device, thereby extending the service life and reliability of the measuring device.

[0007] According to some embodiments of the present invention, the pressure difference between the first pressure source and the non-variable section of the pipeline is δP1, and the pressure difference between the second pressure source and the variable section of the pipeline is δP1', wherein 30Pa≤δP1≤30000Pa, 30Pa≤δP1'≤30000Pa.

[0008] According to some embodiments of the present 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.

[0009] According to some embodiments of the present invention, the first pipeline and the second pipeline are respectively provided with a pressure stabilizing device, and the pressure stabilizing device is respectively arranged between the first sensor and the non-reducing diameter section of the pipeline and between the second sensor and the reducing diameter section of the pipeline, or the pressure stabilizing device is respectively arranged between the first sensor and the first pressure source and between the second sensor and the second pressure source.

[0010] According to some embodiments of the present invention, the pressure stabilizing device is a flow resistor, an air resistor, or a spiral tube.

[0011] According to some embodiments of the present invention, the first sensor and the second sensor are both pressure sensors, the first sensor is used to measure the pressure difference δP1 between the inlet and outlet of the first pipeline, and the second sensor is used to measure the pressure difference δP1' between the inlet and outlet of the second pipeline. , where P0 is the first preset pressure, δP1 is the pressure difference between the inlet and outlet of the first pipeline, ρ is the fluid density in the pipeline, A1 is the cross-sectional area of ​​the non-variable section of the pipeline, v1 is the fluid flow rate in the non-variable section of the pipeline, P0' is the second preset pressure, δP1' is the pressure difference between the inlet and outlet of the second pipeline, and A2 is the cross-sectional area of ​​the variable section of the pipeline.

[0012] According to some embodiments of the present invention, the first sensor and the second sensor are both flow sensors, the first sensor is used to measure the flow velocity V0 of the fluid medium in the first pipeline, and the second sensor is used to measure the flow velocity V0' of the fluid medium in the second pipeline. Among them, P0 is the first preset pressure, P1 is the pressure at the outlet end of the first pipeline, ρ0 is the density of the fluid medium in the first pipeline and the second pipeline, ρ is the fluid density in the pipeline, A1 is the cross-sectional area of ​​the non-variable section of the pipeline, v1 is the fluid flow rate in the non-variable section of the pipeline, P0' is the second preset pressure, P1' is the pressure at the outlet end of the second pipeline, A2 is the cross-sectional area of ​​the variable section of the pipeline, H1 is the flow resistance in the first pipeline, and H2 is the flow resistance in the second pipeline.

[0013] According to some embodiments of the present invention, the measuring device for measuring the flow rate of a fluid in a pipeline further includes a pretreatment component, which is respectively arranged upstream of the first pressure source and the second pressure source, and the pretreatment component includes at least one of a temperature control component, a humidity control component, a filter component and a pressure control component.

[0014] According to a method for measuring the flow rate of a fluid in a pipeline in an embodiment of the second aspect of the present invention, the measuring method adopts the above-mentioned measuring device for measuring the flow rate of a fluid in a pipeline and includes the following steps: S1, conveying a fluid medium to a non-variable diameter section of the pipeline according to a first preset pressure P0, and conveying a fluid medium to a variable diameter section of the pipeline according to a second preset pressure P0'; S2, measuring the pressure difference δP1 between the inlet and outlet ends of the first pipeline or measuring the flow rate V0 of the fluid medium in the first pipeline to obtain a first detection value, measuring the pressure difference δP1' between the inlet and outlet ends of the second pipeline or measuring the flow rate V0' of the fluid medium in the second pipeline to obtain a second detection value; S3, calculating 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.

[0015] According to the method for measuring the flow rate of the fluid in the pipeline according to the embodiment of the present invention, by conveying the fluid medium to the non-variable diameter section of the pipeline according to the first preset pressure P0, conveying the fluid medium to the variable diameter section of the pipeline according to the second preset pressure P0', measuring the pressure difference between the inlet end and the outlet end of the first pipeline and the second pipeline or measuring the flow rate of the fluid medium in the first pipeline, thereby 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. Compared with the solution in the related art that requires the fluid in the pipeline to be tested to pass through the measuring device to realize the detection, non-contact detection of the measuring device is realized, which can effectively prevent the fluid in the pipeline from damaging the measuring device, thereby extending the service life and reliability of the measuring device.

[0016] According to some embodiments of the present invention, step S3 includes: S31: if the pressure difference δP1 and the pressure difference δP1' detected in step S2 are, the fluid flow rate V1 in the non-variable section of the pipeline is calculated by the formula Calculated; S32: 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 fluid flow rate V1 in the non-variable section of the pipeline is calculated by the formula: Calculated; wherein, P0 is the first preset pressure, P1 is the pressure at the outlet end of the first pipeline, ρ0 is the density of the fluid medium in the first pipeline and the second pipeline, ρ is the fluid density in the pipeline, A1 is the cross-sectional area of ​​the non-variable section of the pipeline, v1 is the fluid flow rate in the non-variable section of the pipeline, P0' is the second preset pressure, P1' is the pressure at the outlet end of the second pipeline, A2 is the cross-sectional area of ​​the variable section of the pipeline, H1 is the flow resistance in the first pipeline, H2 is the flow resistance in the second pipeline, δP1 is the pressure difference between the inlet and outlet ends of the first pipeline, and δP1' is the pressure difference between the inlet and outlet ends of the second pipeline.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is a schematic diagram of a measuring device for measuring the flow rate of a fluid in a pipeline according to an embodiment of the present invention;

[0020] Figure 2 4 is a step diagram of a method for measuring the flow velocity of a fluid in a pipeline according to an embodiment of the present invention.

[0021] Reference numerals:

[0022] Measuring device 100;

[0023] A first pressure source 11; a second pressure source 12; a controller 13;

[0024] A first sensor 21; a second sensor 22;

[0025] A first voltage stabilizing device 31, a second voltage stabilizing device 32, and a data processing module 40;

[0026] Pipeline 200 ; reduced diameter section 210 , non-reduced diameter section 220 . DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0028] A measuring device 100 for measuring the flow rate of a fluid in a pipeline according to an embodiment of the first aspect of the present invention will be described below with reference to the accompanying drawings.

[0029] like Figure 1 As shown, the measuring device 100 for measuring the flow rate of a fluid in a pipeline according to an embodiment of the present invention comprises a first pressure source 11, a second pressure source 12, a first sensor 21, a second sensor 22, a first pipeline and a second pipeline. The pipeline 200 to be measured comprises a variable diameter section 210 and a non-variable diameter section 220. It can be understood that the variable diameter section 210 can be a preset variable diameter section 210 of the pipeline 200 or a variable diameter section 210 added later for measuring the flow rate in the pipeline 200. The gas to be measured can be clean gas at normal temperature, dusty gas, high temperature and high humidity gas, highly corrosive fluid transportation and other industrial occasions.

[0030] The first pressure source 11 is connected to the non-diameter-reducing section 220 of the pipeline 200 to be tested through the first pipeline, that is, the inlet end of the first pipeline is connected to the first pressure source 11, and the outlet end is connected to the non-diameter-reducing section 220 of the pipeline 200. The first pressure source 11 is configured to transport the fluid medium into the non-diameter-reducing section 220 of the pipeline 200 according to the first preset pressure P0;

[0031] Similarly, the second pressure source 12 is connected to the reduced diameter section 210 of the pipeline 200 to be tested through the second pipeline, that is, the inlet end of the second pipeline is connected to the second pressure source 12, and the outlet end is connected to the reduced diameter section 210 of the pipeline 200. The second pressure source 12 is configured to transport the fluid medium into the non-reduced diameter section 220 of the pipeline 200 according to the second preset pressure P0', wherein the first preset pressure P0 is greater than the pressure in the non-reduced diameter section 220 of the pipeline 200, and the second preset pressure P0' is greater than the pressure in the reduced diameter section 210. It can be understood that the fluid medium can be a gas, such as compressed air, compressed inert gas, etc., or a liquid, such as water, etc. Those skilled in the art can make an adaptive selection according to the fluid in the pipeline 200 to be tested.

[0032] The first sensor 21 is arranged in the first pipeline, and the second sensor 22 is arranged in the second pipeline. The first sensor 21 and the second sensor 22 are respectively used to measure the pressure difference δP1 between the inlet and outlet ends of the first pipeline or to measure the fluid medium flow rate V0 in the first pipeline to obtain a first detection value and to measure the pressure difference δP1' between the inlet and outlet ends of the second pipeline or to measure the fluid medium flow rate V0' in the second pipeline to obtain a second detection value.

[0033] Furthermore, 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 the first preset pressure P0 and the second preset pressure P0' of the first pressure source 11 and the second pressure source 12, as well as the first detection value of the first sensor 21 and the second detection value of the second sensor 22, and then according to the Bernoulli equation, the fluid flow rate in the non-variable diameter section 220 in the pipeline 200 to be tested can be calculated.

[0034] Therefore, according to the measuring device 100 for measuring the flow rate of the fluid in the pipeline 200 according to the embodiment of the present invention, by setting the first pressure source 11 and the second pressure source 12, the first pressure source 11 and the second pressure source 12 are used to respectively introduce the fluid medium into the non-variable section 220 and the variable section 210 of the pipeline 200 to be measured according to the first preset pressure and the second preset pressure, and the pressure difference or the flow rate of the fluid medium in the first pipeline and the second pipeline is detected, and then the data processing module 40 calculates the flow rate of the fluid in the pipeline 200 to be measured according to the Bernoulli equation. Compared with the solution in the related art that requires the fluid in the pipeline 200 to be measured to pass through the measuring device 100 to achieve detection, non-contact detection of the measuring device 100 is achieved, which can effectively prevent the fluid in the pipeline 200 from damaging the measuring device 100, thereby extending the service life and reliability of the measuring device 100.

[0035] like Figure 1 In some embodiments of the present invention, in order to ensure that the pressures in the first pipeline, the second pipeline and the pipeline to be measured 200 are within a safe range and at the same time ensure the measurement accuracy of the sensor, the pressure difference δP1 between the first pressure source 11 and the non-reducing section 220 of the pipeline 200 is between 30Pa and 30000Pa. For example, δP1 can be 30Pa, 300Pa, 3000Pa or 30000Pa, and the pressure difference δP1' between the second pressure source 12 and the reducing section 210 of the pipeline 200 is also between 30Pa and 3 0000Pa, for example, δP1' can be 30Pa, 300Pa, 3000Pa or 30000Pa. It can be understood that when the pressure difference δP1 or δP1' is less than 30Pa, the measurement accuracy requirements for the first sensor 21 and the second sensor 22 are relatively high and the detection error is easily increased. When the pressure difference δP1 or δP1' is greater than 30000Pa, the pressure in the first pipeline and the second pipeline increases. At the same time, the pressure in the pipeline 200 to be tested also increases significantly, resulting in certain safety hazards.

[0036] like Figure 1 In some embodiments, in order to simplify the structure, reduce the number of components of the measuring device 100, and simplify the calculation process, the first pressure source 11 and the second pressure source 12 can be the same pressure source, and the first preset pressure P0 can be equal to the second preset pressure P0'. For example, the first pressure source 11 and the second pressure source 12 can be constant pressure boxes, and the constant pressure box can also be provided with a controller 13 to control the preset pressure output by the constant pressure box. The constant pressure box is respectively connected to the non-variable section 220 and the variable section 210 of the pipeline 200, and the fluid medium is introduced into the non-variable section 220 and the variable section 210 of the pipeline 200 according to the preset pressure.

[0037] like Figure 1In some examples of the present invention, in order to ensure the stability of the measurement results, a voltage stabilizing device is provided on the first pipeline and the second pipeline respectively, for example, Figure 1 In the figure, the first pressure stabilizing device 31 is arranged between the first sensor 21 and the non-reducing section 220 of the pipeline 200, and the second pressure stabilizing device 32 is arranged between the second sensor 22 and the reducing section 210 of the pipeline 200. Of course, the pressure stabilizing devices can also be arranged between the first sensor 21 and the first pressure source 11, and between the second sensor 22 and the second pressure source 12, respectively.

[0038] Optionally, the pressure stabilizing device may be an air resistor, a flow resistor or a spiral tube, for example, Figure 1 In the example shown, the pressure stabilizing device is a high-precision jewel air resistor, thereby ensuring stable pressure in the first pipeline and the second pipeline.

[0039] In some embodiments of the present invention, the first sensor 21 and the second sensor 22 are both pressure sensors. The first sensor 21 is used to measure the pressure difference δP1 between the inlet and outlet of the first pipeline, and the second sensor 22 is used to measure the pressure difference δP1' between the inlet and outlet of the second pipeline. Thus, the outlet of the first pipeline and the connection between the non-reducing section 220 ( Figure 1 The fluid pressure at point C is approximately equal to (P0-δP1), and the outlet of the second pipeline and the connection between the reducing section 210 ( Figure 1 The fluid pressure at point D in the middle is roughly equal to (P0'-δP1'), and then according to the Bernoulli equation and the flow equation ( ), we can get , wherein P0 is the first preset pressure, δP1 is the pressure difference between the inlet and outlet of the first pipeline, ρ is the fluid density in the pipeline 200, A1 is the cross-sectional area of ​​the non-variable section 220 of the pipeline 200, v1 is the fluid flow rate in the non-variable section 220 of the pipeline 200, P0' is the second preset pressure, δP1' is the pressure difference between the inlet and outlet of the second pipeline, A2 is the cross-sectional area of ​​the variable section 210 of the pipeline 200, thereby calculating the flow rate V1 of the fluid in the non-variable section 220 of the pipeline 200.

[0040] In other embodiments of the present invention, the first sensor 21 and the second sensor 22 are both flow sensors. The first sensor 21 is used to measure the flow velocity V0 of the fluid medium in the first pipeline, and the second sensor 22 is used to measure the flow velocity V0' of the fluid medium in the second pipeline. Therefore, according to the Bernoulli equation, .

[0041] Thus, the outlet end of the first pipeline and the connection between the non-diameter-reducing section 220 ( Figure 1 The fluid pressure P1 at the pressure at point C in the middle, the outlet end of the second pipeline and the connection between the reducing section 210 ( Figure 1 The fluid pressure P1' is the pressure at point D in the middle.

[0042] Then, in the pipeline 200 to be tested, according to the Bernoulli equation and the flow equation ( ), we can get the equation

[0043] By combining equations (1), (2) and (3), the fluid flow rate V1 in the non-variable diameter section 220 of the pipeline 200 to be tested can be calculated.

[0044] According to an embodiment of the present invention, in order to reduce the influence of high temperature, high humidity, high pressure and impurities in the fluid medium on the detection results of the first sensor 21 and the second sensor 22, the measuring device 100 also includes at least one of a temperature control component, a humidity control component, a filter component and a pressure control component. The temperature control component, the humidity control component, the filter component and the pressure control component can be arranged upstream of the first pressure source 11 and the second pressure source 12, or 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 pre-treated before entering the first sensor 21 and the second sensor 22, thereby ensuring the detection reliability.

[0045] Please refer to the following Figure 1 and 2 The method for measuring the flow rate of a fluid in a pipeline according to the second embodiment of the present invention is described. The method can be applied to the measurement of the flow rate of fluids in industrial occasions such as the transportation of clean room temperature gas, dusty gas, high temperature and high humidity gas, and highly corrosive fluid.

[0046] According to a second aspect of the present invention, a method for measuring the flow rate of a fluid in a pipeline is provided. The method adopts a measuring device for measuring the flow rate of a fluid in a pipeline according to the above embodiment of the present invention. The method specifically comprises the following steps:

[0047] S1, delivering the fluid medium to the non-diameter-changing section of the pipeline according to a first preset pressure P0, and delivering the fluid medium to the diameter-changing section of the pipeline according to a second preset pressure P0';

[0048] S2, measuring the pressure difference δP1 between the inlet and outlet of the first pipeline or measuring the flow rate V0 of the fluid medium in the first pipeline to obtain a first detection value, measuring the pressure difference δP1' between the inlet and outlet of the second pipeline or measuring the flow rate V0' of the fluid medium in the second pipeline to obtain a second detection value;

[0049] 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.

[0050] Among them, in step S3, if the pressure difference δP1 and the pressure difference δP1' detected in step S2, the fluid flow rate in the pipeline to be tested can be calculated by formula (1): Calculated, wherein P0 is the first preset pressure, δP1 is the pressure difference between the inlet and outlet of the first pipeline, ρ is the fluid density in the pipeline, A1 is the cross-sectional area of ​​the non-variable section of the pipeline, v1 is the fluid flow rate in the non-variable section of the pipeline, P0' is the second preset pressure, δP1' is the pressure difference between the inlet and outlet of the second pipeline, A2 is the cross-sectional area of ​​the variable section of the pipeline, thereby calculating the flow rate V1 of the fluid in the non-variable section of the pipeline;

[0051] 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 obtained by formulas (2)-(4): Calculated. Wherein, P0 is the first preset pressure, P1 is the pressure at the outlet of the first pipeline, ρ0 is the density of the fluid medium in the first pipeline and the second pipeline, ρ is the fluid density in the pipeline, A1 is the cross-sectional area of ​​the non-variable section of the pipeline, v1 is the fluid flow rate in the non-variable section of the pipeline, P0' is the second preset pressure, P1' is the pressure at the outlet of the second pipeline, A2 is the cross-sectional area of ​​the variable section of the pipeline, H1 is the flow resistance in the first pipeline, and H2 is the flow resistance in the second pipeline.

[0052] Therefore, according to the method for measuring the flow rate of the fluid in the pipeline according to the embodiment of the present invention, by conveying the fluid medium to the non-variable diameter section of the pipeline according to the first preset pressure P0, conveying the fluid medium to the variable diameter section of the pipeline according to the second preset pressure P0', measuring the pressure difference between the inlet end and the outlet end of the first pipeline and the second pipeline or measuring the flow rate of the fluid medium in the first pipeline, thereby 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. Compared with the solution in the related art that requires the fluid in the pipeline to be tested to pass through the measuring device to realize the detection, non-contact detection of the measuring device is realized, which can effectively prevent the fluid in the pipeline from damaging the measuring device, thereby extending the service life and reliability of the measuring device.

[0053] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0054] In the description of the present invention, "plurality" means two or more.

[0055] In the description of the present invention, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0056] In the description of the present invention, “on”, “over” and “above” a first feature from a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0057] Other configuration examples and operations of the measuring device and the measuring method for measuring the flow rate of a fluid in a pipeline according to the embodiments of the present invention are well known to those skilled in the art and will not be described in detail here.

[0058] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0059] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A measuring device for measuring the flow rate of a fluid in a pipeline, wherein the pipeline comprises a variable diameter section and a non-variable diameter section, characterized in that: include: a first pressure source, used for conveying a fluid medium into the non-diameter-variable section of the pipeline at a first preset pressure P0, wherein the first preset pressure P0 is greater than the pressure in the non-diameter-variable section of the pipeline; a first pipeline, wherein an inlet end of the first pipeline is connected to the first pressure source and an outlet end of the first pipeline is connected to a non-reducing diameter section of the pipeline; A first sensor, which is disposed in the first pipeline and is used to measure a pressure difference δP1 between an inlet end and an outlet end of the first pipeline or to measure a flow rate V0 of a fluid medium in the first pipeline to obtain a first detection value; A second pressure source, used for conveying a fluid medium into the variable diameter section of the pipeline at a second preset pressure P0', wherein the second preset pressure P0' is greater than the pressure in the variable diameter section of the pipeline; a second pipeline, wherein an inlet end of the second pipeline is connected to the second pressure source and an outlet end of the second pipeline is connected to the reducing section of the pipeline; A second sensor, which is disposed in the second pipeline and is used to measure the pressure difference δP1' between the inlet and outlet of the second pipeline or to measure the flow rate V0' of the fluid medium in the second pipeline to obtain a second detection value; a data processing module, wherein the data processing module communicates with the first pressure source, the second pressure source, the first sensor, and the second sensor respectively to calculate 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, wherein the first sensor and the second sensor are both pressure sensors, the first sensor is used to measure the pressure difference δP1 between the inlet end and the outlet end of the first pipeline, and the second sensor is used to measure the pressure difference δP1' between the inlet end and the outlet end of the second pipeline, , Wherein, P0 is the first preset pressure, δP1 is the pressure difference between the inlet and outlet of the first pipeline, ρ is the fluid density in the pipeline, A1 is the cross-sectional area of ​​the non-variable section of the pipeline, v1 is the fluid flow rate in the non-variable section of the pipeline, P0' is the second preset pressure, δP1' is the pressure difference between the inlet and outlet of the second pipeline, A2 is the cross-sectional area of ​​the variable section of the pipeline, 30Pa≤δP1≤30000Pa, the first preset pressure is equal to the second preset pressure, or, The first sensor and the second sensor are both flow sensors. The first sensor is used to measure the flow velocity V0 of the fluid medium in the first pipeline, and the second sensor is used to measure the flow velocity V0' of the fluid medium in the second pipeline. Among them, P0 is the first preset pressure, P1 is the pressure at the outlet end of the first pipeline, ρ0 is the density of the fluid medium in the first pipeline and the second pipeline, ρ is the fluid density in the pipeline, A1 is the cross-sectional area of ​​the non-variable section of the pipeline, v1 is the fluid flow rate in the non-variable section of the pipeline, P0' is the second preset pressure, P1' is the pressure at the outlet end of the second pipeline, A2 is the cross-sectional area of ​​the variable section of the pipeline, H1 is the flow resistance in the first pipeline, H2 is the flow resistance in the second pipeline, and the first preset pressure is equal to the second preset pressure.

2. The measuring device for measuring the flow rate of a fluid in a pipeline according to claim 1, characterized in that: in, 30Pa≤δP1'≤30000Pa.

3. The measuring device for measuring the flow rate of a fluid in a pipeline according to claim 1, characterized in that: The first pressure source and the second pressure source are the same pressure source.

4. The measuring device for measuring the flow rate of a fluid in a pipeline according to claim 1, characterized in that: The first pipeline and the second pipeline are respectively provided with a pressure stabilizing device, and the pressure stabilizing device is respectively arranged between the first sensor and the non-diameter-reducing section of the pipeline and between the second sensor and the diameter-reducing section of the pipeline, or the pressure stabilizing device is respectively arranged between the first sensor and the first pressure source and between the second sensor and the second pressure source.

5. The measuring device for measuring the flow rate of a fluid in a pipeline according to claim 4, characterized in that: The voltage stabilizing device is a spiral tube.

6. The measuring device for measuring the flow rate of a fluid in a pipeline according to any one of claims 1 to 5, characterized in that: It also includes a pre-treatment component, which is respectively arranged upstream of the first pressure source and the second pressure source, and the pre-treatment component includes at least one of a temperature control component, a humidity control component, a filter component and a pressure control component.

7. A method for measuring the flow rate of a fluid in a pipeline, the method using the measuring device for measuring the flow rate of a fluid in a pipeline according to any one of claims 1 to 6, characterized in that: The measuring method comprises the following steps: S1, delivering the fluid medium to the non-diameter-changing section of the pipeline according to a first preset pressure P0, and delivering the fluid medium to the diameter-changing section of the pipeline according to a second preset pressure P0'; S2, measuring the pressure difference δP1 between the inlet and outlet of the first pipeline or measuring the flow rate V0 of the fluid medium in the first pipeline to obtain a first detection value, measuring the pressure difference δP1' between the inlet and outlet of the second pipeline or measuring the flow rate 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.

8. The method for measuring the flow velocity of a fluid in a pipeline according to claim 7, characterized in that: Step S3 includes: S31: If the pressure difference δP1 and the pressure difference δP1' detected in step S2, the fluid flow rate V1 in the non-variable section of the pipeline is calculated by the formula Calculated; 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 step S2, the flow velocity V1 of the fluid in the non-variable section of the pipeline is calculated by the formula: Calculated; Among them, P0 is the first preset pressure, P1 is the pressure at the outlet end of the first pipeline, ρ0 is the density of the fluid medium in the first pipeline and the second pipeline, ρ is the fluid density in the pipeline, A1 is the cross-sectional area of ​​the non-variable section of the pipeline, v1 is the fluid flow rate in the non-variable section of the pipeline, P0' is the second preset pressure, P1' is the pressure at the outlet end of the second pipeline, A2 is the cross-sectional area of ​​the variable section of the pipeline, H1 is the flow resistance in the first pipeline, H2 is the flow resistance in the second pipeline, δP1 is the pressure difference between the inlet and outlet ends of the first pipeline, and δP1' is the pressure difference between the inlet and outlet ends of the second pipeline.

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