Gas flow measuring device suitable for circular pipeline

Abstract

The invention discloses a gas flow measuring device suitable for a circular pipeline, which comprises a plurality of differential pressure measuring units, the differential pressure measuring units are arranged in the circular pipeline and are annular, the center lines of the plurality of differential pressure measuring units coincide, and the center lines of the plurality of differential pressure measuring units coincide with the center lines of the plurality of differential pressure measuring units. On a projection plane perpendicular to the axial direction of the differential pressure measuring units, the plurality of differential pressure measuring units are spaced apart, the plurality of differential pressure measuring units are spaced apart in the axial direction of the differential pressure measuring units, and each differential pressure measuring unit is provided with a pressure tapping point; and the control system is used for acquiring the differential pressure signals acquired by the plurality of pressure measuring points. According to the gas flow measurement device suitable for the circular pipeline, the representativeness of the total cross-section flow measurement of the circular pipeline can be improved, the flow interference of the differential pressure measurement unit on the gas in the circular pipeline is reduced, the uniformity of a flow field area is favorably realized, and the local dust accumulation risk of the differential pressure measurement unit is reduced.

Description

Technical Field

[0001] This invention relates to the field of flue gas measurement technology, and in particular to a gas flow measurement device suitable for circular pipes. Background Technology

[0002] In carbon emission monitoring and industrial gas flow detection, the airflow distribution inside circular pipes is complex. Currently, the mainstream technologies used for gas flow measurement in circular pipes include thermal flow meters and Pitot tube flow meters. However, thermal flow meters and Pitot tube flow meters mostly adopt single-point measurement methods. When the flow field distribution is uneven or the operating conditions fluctuate greatly, they are prone to insufficient representativeness and cannot truly reflect the average flow velocity of the entire circular pipe cross-section. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a gas flow measurement device suitable for circular pipes, which can improve the representativeness of the full cross-sectional flow measurement of circular pipes.

[0004] A gas flow measurement device for circular pipes according to an embodiment of the present invention includes: a plurality of differential pressure measuring units, wherein the differential pressure measuring units are disposed inside the circular pipe and are annular, the center lines of the plurality of differential pressure measuring units coincide, the plurality of differential pressure measuring units are spaced apart on a projection plane perpendicular to the axial direction of the differential pressure measuring units, and each differential pressure measuring unit is provided with a pressure tapping point; and a control system, wherein the control system is used to acquire differential pressure signals collected by the plurality of pressure tapping points.

[0005] According to an embodiment of the present invention, a gas flow measurement device suitable for circular pipes includes multiple differential pressure measurement units and a control system. The centerlines of the multiple annular differential pressure measurement units coincide, and each differential pressure measurement unit is provided with a pressure tapping point. On a projection plane perpendicular to the axial direction of the differential pressure measurement units, the multiple differential pressure measurement units are spaced apart. The multiple differential pressure measurement units are also spaced apart in the axial direction of the differential pressure measurement units, so that the multiple differential pressure measurement units are staggered. Firstly, it can realize the simultaneous acquisition of radial and axial flow velocity information of the circular pipe, reduce the measurement blind zone, and improve the representativeness of the full cross-section flow measurement of the circular pipe. Secondly, it can reduce the obstruction effect of the gas flow measurement device in the same cross-section of the circular pipe, thereby reducing the interference of the differential pressure measurement units on the gas flow in the circular pipe, reducing the probability of turbulence formation in the circular pipe, and ensuring normal operating conditions. Thirdly, it is beneficial to achieve uniform flow field area and reduce the risk of local dust accumulation in the differential pressure measurement units.

[0006] In addition, the gas flow measuring device for circular pipes according to the present invention may also have the following additional technical features:

[0007] In some embodiments, the inner diameter of the plurality of differential pressure measuring units gradually decreases along the axial direction of the differential pressure measuring unit.

[0008] In some embodiments, multiple differential pressure measuring units are evenly spaced on a projection plane perpendicular to the axial direction of the differential pressure measuring unit.

[0009] In some embodiments, the plurality of differential pressure measuring units are evenly spaced in the axial direction of the differential pressure measuring unit.

[0010] In some embodiments, the gas flow measurement device for circular pipes further includes: a structural support fixed inside the circular pipe and extending along the axial direction of the differential pressure measuring unit, the structural support being connected to a plurality of the differential pressure measuring units.

[0011] In some embodiments, there are multiple structural supports, and the multiple structural supports are evenly spaced in the circumferential direction of the differential pressure measuring unit.

[0012] In some embodiments, the structural support and the plurality of differential pressure measurement units are integrated into one piece.

[0013] In some embodiments, each differential pressure measuring unit is provided with a plurality of pressure tapping points, and the plurality of pressure tapping points on the same differential pressure measuring unit are evenly spaced in the circumferential direction of the differential pressure measuring unit.

[0014] In some embodiments, along the radial direction of the differential pressure measuring unit, a plurality of pressure taps on two adjacent differential pressure measuring units are arranged opposite each other.

[0015] In some embodiments, the control system includes: a control component disposed outside the circular pipe; and a pressure tapping tube, one end of which is connected to the control component and the other end of which is connected to the differential pressure measuring unit, wherein the pressure tapping tube is one of a plurality of differential pressure measuring units corresponding to one of the plurality of differential pressure measuring units.

[0016] 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. Attached Figure Description

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1This is a front view schematic diagram of a gas flow measuring device and a circular pipe according to an embodiment of the present invention;

[0019] Figure 2 This is a cross-sectional schematic diagram of a gas flow measuring device and a circular pipe according to an embodiment of the present invention.

[0020] Figure label:

[0021] 100. Gas flow measurement device;

[0022] 1. Differential pressure measurement unit; 11. Pressure tapping points;

[0023] 2. Control system; 21. Control components; 211. Controller; 212. Differential pressure transmitter; 22. Pressure tap;

[0024] 3. Structural support;

[0025] 200. Circular pipe. Detailed Implementation

[0026] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0027] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0030] A gas flow measuring device 100 suitable for a circular pipe 200 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0031] like Figure 1 and Figure 2 As shown, the gas flow measurement device 100 for a circular pipe 200 according to an embodiment of the present invention includes a plurality of differential pressure measurement units 1 and a control system 2.

[0032] Specifically, see the attached document. Figure 1 As shown, the differential pressure measuring unit 1 is located inside the circular pipe 200 and is ring-shaped. The center lines of multiple differential pressure measuring units 1 coincide, and each differential pressure measuring unit 1 is provided with a pressure tap 11. The multiple differential pressure measuring units 1 are arranged in concentric circles, which is a regular design and simple structure. It has relatively little interference with the gas flow inside the circular pipe 200, and can reduce the probability of eddies or changes in gas flow direction being formed inside the circular pipe 200 due to the presence of the differential pressure measuring units 1, thereby ensuring the accuracy of the measurement results. For example, the number of differential pressure measuring units 1 in the gas flow measuring device 100 can be two, three, four, five, or six.

[0033] Further, see attached document. Figure 1 As shown, in the axial direction perpendicular to the differential pressure measuring unit 1 (refer to the attached diagram) Figure 2 On the projection plane (direction a) shown, multiple differential pressure measuring units 1 are spaced apart. Firstly, this allows for coverage measurement of different radius areas of the circular pipe 200, reducing measurement blind spots and improving the representativeness of the full-section flow measurement of the circular pipe 200. Secondly, compared to the overlapping area of ​​multiple differential pressure measuring units on the projection plane perpendicular to the axial direction, spacing the multiple differential pressure measuring units 1 on the projection plane perpendicular to the axial direction reduces the obstruction effect of the differential pressure measuring units 1 on gas flow, further reducing the interference of the differential pressure measuring units 1 on the gas flow within the circular pipe 200. Thirdly, this facilitates the production and processing of the differential pressure measuring units 1, reduces the production difficulty of the gas flow measuring device 100, and lowers the production cost of the gas flow measuring device 100.

[0034] Furthermore, see the attached document. Figure 2As shown, multiple differential pressure measuring units 1 are spaced apart in the axial direction of the differential pressure measuring unit 1. It can be understood that in the prior art, the measuring device structure is concentrated and planar, which easily forms turbulence in the circular pipe, increases gas flow resistance, and affects normal operating conditions. However, by having multiple differential pressure measuring units 1 spaced apart in the axial direction of the differential pressure measuring unit 1, the present invention can, on the one hand, lengthen the gas flow measuring device 100 in the axial direction of the circular pipe 200 (see attached figure). Figure 2 The length in direction a) shown can achieve coverage measurement of different axial positions of the circular pipe 200, reduce measurement blind spots, and improve the representativeness of the full cross-section flow measurement of the circular pipe 200. On the other hand, it can reduce the obstruction effect of the gas flow measuring device 100 in the same cross-section of the circular pipe 200, thereby reducing the interference of the differential pressure measuring unit 1 on the flow of gas in the circular pipe 200, reducing the probability of turbulence formation in the circular pipe 200, and ensuring normal operating conditions.

[0035] In the prior art, the measuring device inside the circular pipe may block the airflow or cause eddies, which makes it easy for dust to accumulate in the measuring device in the part where the airflow velocity is relatively low. However, the present invention has multiple annular differential pressure measuring units 1 with their center lines overlapping. On the projection plane perpendicular to the axial direction of the differential pressure measuring unit 1, the multiple differential pressure measuring units 1 are spaced apart. The multiple differential pressure measuring units 1 are spaced apart in the axial direction of the differential pressure measuring unit 1, which can make the multiple differential pressure measuring units 1 staggered, which is conducive to achieving a uniform flow field area and reducing the risk of local dust accumulation in the differential pressure measuring unit 1.

[0036] Furthermore, see the attached document. Figure 1 As shown, the control system 2 is used to acquire differential pressure signals collected from multiple pressure tapping points 11. It can collect differential pressure signals from multiple pressure tapping points 11 in a preset order, perform rolling average calculation in real time, and output the steady-state flow value of the entire cross-section of the circular pipe 200.

[0037] According to an embodiment of the present invention, a gas flow measurement device 100 suitable for a circular pipe 200 includes multiple differential pressure measurement units 1 and a control system 2. The center lines of the multiple annular differential pressure measurement units 1 coincide, and each differential pressure measurement unit 1 is provided with a pressure tapping point 11. On a projection plane perpendicular to the axial direction of the differential pressure measurement unit 1, the multiple differential pressure measurement units 1 are spaced apart. The multiple differential pressure measurement units 1 are spaced apart in the axial direction of the differential pressure measurement unit 1, so that the multiple differential pressure measurement units 1 are staggered. Firstly, it can realize the simultaneous acquisition of radial and axial flow velocity information of the circular pipe 200, reduce the measurement blind zone, and improve the representativeness of the flow measurement of the entire cross section of the circular pipe 200. Secondly, it can reduce the obstruction effect of the gas flow measurement device 100 in the same cross section of the circular pipe 200, thereby reducing the interference of the differential pressure measurement units 1 on the flow of gas in the circular pipe 200, reducing the probability of turbulence formation in the circular pipe 200, and ensuring normal operating conditions. Thirdly, it is beneficial to achieve uniform flow field area and reduce the risk of local dust accumulation in the differential pressure measurement units 1.

[0038] In some embodiments of the present invention, reference is made to the appendix. Figure 1 and attached Figure 2 As shown, along the axial direction of the differential pressure measuring unit 1, the inner diameter of the multiple differential pressure measuring units 1 gradually decreases, so that the multiple differential pressure measuring units 1 form a "pagoda-shaped" gas flow measuring device 100. This can reduce the structural complexity of the gas flow measuring device 100, facilitate the production and processing of the gas flow measuring device 100, and make it easier to place the gas flow measuring device 100 into the circular pipe 200, thus reducing the assembly difficulty of the gas flow measuring device 100.

[0039] In a further embodiment of the invention, reference is made to the appendix. Figure 1 As shown, multiple differential pressure measuring units 1 are evenly spaced on the projection plane perpendicular to the axial direction of the differential pressure measuring unit 1. It can be understood that when gas flows in the circular pipe 200, the gas velocity is usually not uniform on the cross-section perpendicular to the axial direction of the differential pressure measuring unit 1. The velocity in the central region is relatively fast, and the velocity in the region near the inner circumference of the pipe is relatively slow. The evenly spaced multiple differential pressure measuring units 1 can comprehensively capture the velocity distribution. By analyzing the data of each pressure tapping point 11, the average velocity and flow rate can be calculated more accurately. Compared with the method of non-uniformly distributed measuring points, the measurement error can be significantly reduced.

[0040] In a further embodiment of the invention, reference is made to the appendix. Figure 2As shown, multiple differential pressure measurement units 1 are evenly spaced in the axial direction of the differential pressure measurement unit 1, which is conducive to comprehensively capturing the flow velocity distribution. By analyzing the data of each pressure tapping point 11, the average flow velocity and flow rate can be calculated more accurately. Compared with the method of non-uniformly distributed measurement points, the measurement error can be significantly reduced.

[0041] In some embodiments of the present invention, reference is made to the appendix. Figure 1 and attached Figure 2 As shown, the gas flow measurement device 100 suitable for the circular pipe 200 also includes a structural support 3. The structural support 3 is fixed inside the circular pipe 200 and extends along the axial direction of the differential pressure measurement unit 1. The structural support 3 is connected to multiple differential pressure measurement units 1. The structural support 3 is used to connect multiple differential pressure measurement units 1, so that multiple differential pressure measurement units 1 are formed into a whole through the structural support 3. This makes it easy to install multiple differential pressure measurement units 1 into the circular pipe 200, and it is not necessary to fix each differential pressure measurement unit 1 separately inside the circular pipe 200, which facilitates the fixation of multiple differential pressure measurement units 1.

[0042] It is understandable that before assembling the gas flow measuring device 100 into the circular pipe 200, the spacing of multiple differential pressure measuring units 1 in the radial and axial directions is controlled. Then, the multiple differential pressure measuring units 1 are connected into a whole by the structural support 3 to achieve relative fixation between the multiple differential pressure measuring units 1 and the structural support 3. Finally, the whole formed by the multiple differential pressure measuring units 1 and the structural support 3 is installed into the circular pipe 200.

[0043] In a further embodiment of the invention, reference is made to the appendix. Figure 1 and attached Figure 2 As shown, there are multiple structural supports 3, which are evenly spaced in the circumferential direction of the differential pressure measuring unit 1. These supports can indirectly connect the multiple differential pressure measuring units 1 at multiple points in the circumferential direction, thereby ensuring the reliability of the connection between the multiple differential pressure measuring units 1, improving the overall rigidity of the gas measuring device, ensuring the relative positions of the multiple differential pressure measuring units 1 in the axial and radial directions, ensuring the position of the multiple pressure taps 11, and thus ensuring the accuracy of the measurement. For example, there can be two, three, four, five, or six structural supports 3 evenly spaced in the circumferential direction of the differential pressure measuring unit 1.

[0044] In a specific example, see Appendix Figure 1 and attached Figure 2As shown, the gas flow measurement device 100 includes five differential pressure measurement units 1 and four structural supports 3. Along the axial direction of the differential pressure measurement units 1, the inner diameter of the five differential pressure measurement units 1 gradually decreases. On the projection plane perpendicular to the axial direction of the differential pressure measurement units 1, the five differential pressure measurement units 1 are evenly spaced. The five differential pressure measurement units 1 are evenly spaced in the axial direction of the differential pressure measurement units 1, and the four structural supports 3 are evenly spaced in the circumferential direction of the differential pressure measurement units 1. One end of each structural support 3 is fixed to the inner wall of the circular pipe 200, and the other end extends toward the center line of the differential pressure measurement unit 1, so that each structural support 3 is simultaneously installed in multiple differential pressure measurement units 1, thereby minimizing the resistance effect of the structural supports 3 on the airflow.

[0045] In a further embodiment of the invention, reference is made to the appendix. Figure 1 and attached Figure 2 As shown, the structural support 3 and multiple differential pressure measuring units 1 are integrated into one piece, which can simplify the assembly process of the gas flow measuring device 100, reduce the difficulty of installation, calibration and maintenance of the gas flow measuring device 100, eliminate the need to connect the structural support 3 to the multiple differential pressure measuring units 1 separately, and improve the structural strength of the structural support 3 and the multiple differential pressure measuring units 1, thus ensuring the reliability and stability of the gas flow measuring device 100.

[0046] It should be noted that the multiple differential pressure measuring units 1 are connected by the structural support 3 and are not directly connected to the inner wall of the circular pipe 200. The structural support 3 is spot-welded to the inner wall of the circular pipe 200, which can ensure the reliability of the connection between the structural support 3 and the inner wall of the circular pipe 200, improve the overall structural strength, simplify the installation process of the structural support 3, and improve the assembly efficiency of the gas flow measuring device 100.

[0047] In some embodiments of the present invention, reference is made to the appendix. Figure 1 As shown, each differential pressure measuring unit 1 is provided with multiple pressure taps 11. The multiple pressure taps 11 on the same differential pressure measuring unit 1 are evenly spaced in the circumferential direction of the differential pressure measuring unit 1, thereby increasing the number of pressure taps 11 of the gas flow measuring device 100, improving the measurement accuracy of the gas flow measuring device 100, and eliminating the need to increase the number of differential pressure measuring units 1, thus relatively reducing the manufacturing cost of the gas flow measuring device 100.

[0048] It is understandable that when there are local eddies or interference from the structural support 3 inside the circular pipe 200, the differential pressure signals collected by some pressure taps 11 may be abnormal. However, by setting multiple pressure taps 11 on each differential pressure measurement unit 1, multiple measurements can be taken at the same location in the radial and axial directions of the circular pipe 200. This allows the control system 2 to filter out abnormal data and rely only on normal data for calculation while increasing the number of pressure taps 11, ensuring the accuracy of the gas flow measurement device 100 and enabling the adjustment of the sampling frequency and filtering intensity.

[0049] In a specific example, see Appendix Figure 1 and attached Figure 2 As shown, the gas flow measurement device 100 includes five differential pressure measurement units 1, each of which has four pressure taps 11. The gas flow measurement device 100 has a total of twenty pressure taps 11. The control system 2 can only acquire the differential pressure signals of the four pressure taps 11 on the same differential pressure measurement unit 1 at any given time. By sequentially acquiring the differential pressure signals of the pressure taps 11 on the five differential pressure measurement units 1, a database can be formed, abnormal data can be filtered out, and only normal data can be used in the calculation, thereby adjusting the sampling frequency and filtering intensity.

[0050] In a further embodiment of the invention, reference is made to the appendix. Figure 1 and attached Figure 2 As shown, along the radial direction of the differential pressure measuring unit 1, multiple pressure taps 11 on two adjacent differential pressure measuring units 1 are arranged opposite each other, so that the multiple pressure taps 11 arranged radially opposite each other can verify the rationality of the data, identify abnormal data and filter them, ensure the reliability of the measurement data and improve the measurement accuracy.

[0051] In some embodiments of the present invention, reference is made to the appendix. Figure 1 and attached Figure 2 As shown, the control system 2 includes a control component 21 and a pressure tapping pipe 22. The control component 21 is located outside the circular pipe 200. One end of the pressure tapping pipe 22 is connected to the control component 21, and the other end is connected to the differential pressure measuring unit 1. The pressure tapping pipe 22 is a plurality of units corresponding to a plurality of differential pressure measuring units 1.

[0052] Understandably, see attached document. Figure 1As shown, the control component 21 includes a controller 211, a differential pressure transmitter 212, and a signal transmitter. The controller 211 is used to accurately measure and control the gas flow rate. The differential pressure transmitter 212 is connected to one end of the pressure tapping tube 22 away from the differential pressure measuring unit 1. The other end of the differential pressure transmitter 212 away from the pressure tapping tube 22 is connected to the signal transmitter. The pressure tapping tube 22 is used to transmit the differential pressure signals acquired by multiple pressure tapping points 11 on the corresponding differential pressure measuring unit 1 to the outside. The differential pressure transmitter 212 converts the acquired pressure signals into electrical signals and sends them out by the signal transmitter. Through the cooperation of the pressure tapping tube 22 and the control component 21, the number of replacements can be reduced, the measurement accuracy can be improved, the method of use is simple, and a simple testing environment can be provided.

[0053] It should be noted that the control system 2 supports parameterized settings for the polling sequence and rolling average window. The sampling frequency and filtering intensity can be flexibly adjusted according to the on-site working conditions to adapt to the high-precision measurement requirements under different flow velocity fluctuation characteristics. It can effectively suppress transient fluctuations and improve dynamic response speed and measurement accuracy.

[0054] Other configurations and operations of the gas flow measurement device 100 for a circular pipe 200 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0055] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0056] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A gas flow measurement device suitable for circular pipes, characterized in that, include: Multiple differential pressure measuring units are arranged inside a circular pipe in a ring shape. The center lines of the multiple differential pressure measuring units coincide. On a projection plane perpendicular to the axial direction of the differential pressure measuring units, the multiple differential pressure measuring units are spaced apart. The multiple differential pressure measuring units are spaced apart in the axial direction of the differential pressure measuring units. Each differential pressure measuring unit is provided with a pressure tapping point. A control system is used to acquire differential pressure signals collected from multiple pressure tapping points.

2. The gas flow measuring device for circular pipes according to claim 1, characterized in that, Along the axial direction of the differential pressure measuring unit, the inner diameter of the plurality of differential pressure measuring units gradually decreases.

3. The gas flow measuring device suitable for circular pipes according to claim 2, characterized in that, On a projection plane perpendicular to the axial direction of the differential pressure measuring unit, multiple differential pressure measuring units are evenly spaced.

4. The gas flow measuring device suitable for circular pipes according to claim 2, characterized in that, The plurality of differential pressure measuring units are evenly spaced in the axial direction of the differential pressure measuring unit.

5. The gas flow measuring device suitable for circular pipes according to claim 1, characterized in that, The gas flow measurement device suitable for circular pipes also includes: A structural support is fixed inside the circular pipe and extends along the axial direction of the differential pressure measuring unit. The structural support is connected to multiple differential pressure measuring units.

6. The gas flow measuring device for circular pipes according to claim 5, characterized in that, There are multiple structural supports, and the multiple structural supports are evenly spaced in the circumferential direction of the differential pressure measuring unit.

7. The gas flow measuring device for circular pipes according to claim 5, characterized in that, The structural support and the multiple differential pressure measurement units are integrated into one piece.

8. The gas flow measuring device for circular pipes according to claim 1, characterized in that, Each differential pressure measuring unit is provided with multiple pressure taps, and the multiple pressure taps on the same differential pressure measuring unit are evenly spaced in the circumferential direction of the differential pressure measuring unit.

9. The gas flow measuring device for circular pipes according to claim 8, characterized in that, Along the radial direction of the differential pressure measuring unit, multiple pressure taps on two adjacent differential pressure measuring units are arranged opposite each other.

10. The gas flow measuring device for circular pipes according to claim 1, characterized in that, The control system includes: A control component, wherein the control component is disposed outside the circular pipe; A pressure tapping tube, one end of which is connected to the control component and the other end of which is connected to the differential pressure measuring unit. There are multiple pressure tapping tubes, each corresponding to one of the multiple differential pressure measuring units.

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