Dustproof flow measuring device

Abstract

The utility model relates to the field of flow measurement, in particular to a dustproof flow measuring device. Comprising an isolation plate, a high-pressure pressure taking pipe, a low-pressure pressure taking pipe, a low-pressure outer cover and a tail wing, and the isolation plate is used for separating airflow to form a high-pressure area and a low-pressure area which are located on the two sides of the isolation plate; the high-pressure pressure taking pipe is connected to the isolation plate and is arranged in the high-pressure area, the low-pressure pressure taking pipe is connected to the isolation plate and is arranged in the low-pressure area, the low-pressure outer cover is connected to the isolation plate and is arranged in the low-pressure area, the low-pressure pressure taking pipe is located in the low-pressure outer cover, and the tail wing is connected to the outermost side of the low-pressure outer cover. Dustproof can be effectively achieved, and the stable pressure difference in airflow is obtained.

Description

Technical Field

[0001] The utility model relates to the technical field of flow measurement, in particular to a dust-proof flow measurement device. Background Art

[0002] Industrial production involves the measurement of numerous relatively dirty gases, such as blast furnace, converter, and coke oven gases from smelting processes, as well as their mixtures, and flue gas after desulfurization and denitrification. These gases are typically transported through large pipelines (DN400 and above), resulting in slow flow rates and uneven and unstable flow patterns, making it difficult for flow measurement devices to generate flow signals with a high signal-to-noise ratio. Furthermore, the gases are laden with impurities such as particulate matter, industrial oil mist, and water vapor, which can easily contaminate and clog flow measurement devices, further complicating accurate measurement. Large pipeline diameters also make flow meter maintenance and cleaning cumbersome, time-consuming, and labor-intensive.

[0003] Prior Art: CN201220384358.5 provides a solution based on the principle of an averaging tube. This solution utilizes the flow separation and resulting pressure drop caused by fluid flowing through a cylindrical measuring element to generate a differential pressure signal relative to the total pressure within the pipeline. This differential pressure is then converted into flow using a common calculation formula. To accommodate contaminated gases, this solution utilizes a larger pressure tapping port to prevent accumulation of contaminants. Furthermore, the wedge-shaped design of the tapping port enhances the stability of the pressure signal. CN201220146722.4, CN201820100522.2, and CN202020977769 X further provide design solutions for large-scale flue gas emission ducts. These devices are arranged back-to-back with circular tubes with wedge-shaped openings, one opening facing the airflow to measure high pressure, and the other opening facing away from the airflow to measure low pressure, forming individual differential pressure measurement units. These measurement units are then connected via pipes, resulting in a uniform and symmetrical distribution of the units, similar to a matrix structure. The purpose of this design is to measure the pressure distribution at several evenly distributed locations within a large pipe (each measuring cell), average the pressure (connecting the pipes), and obtain the differential pressure across the entire pipe, which is then converted into flow. To further prevent dirt accumulation, a small metal rod is placed within the wedge-shaped measuring cell to prevent airflow disturbances. However, this design reduces the stability of the pressure signal. Utility Model Content

[0004] The purpose of the utility model is to provide a flexible nozzle for adaptive narrow-space gas shielded welding to solve the above-mentioned problems existing in the prior art.

[0005] Technical solution: Dust-proof flow measurement device, including:

[0006] An isolation plate is used to separate the airflow to form a high-pressure area and a low-pressure area on both sides of the isolation plate;

[0007] A high-pressure pressure pipe is connected to the isolation plate and is arranged in the high-pressure area;

[0008] A low-pressure tapping pipe, connected to the isolation plate and disposed in the low-pressure area;

[0009] A low-pressure outer cover is connected to the isolation plate and is disposed in the low-pressure area; the low-pressure pressure pipe is located in the low-pressure outer cover;

[0010] The tail wing is connected to the outermost side of the low-pressure outer cover.

[0011] In a further embodiment, both sides of the connection between the tail wing and the low-pressure curved outer cover are rounded.

[0012] In a further embodiment, an extension length of the tail wing along the airflow direction is greater than or equal to a width of the isolation plate.

[0013] In a further embodiment, a high-pressure outer cover is further included, which is installed in the high-pressure area and wrapped around the high-pressure pressure pipe; both ends of the high-pressure outer cover are designed to be wedge-shaped.

[0014] In a further embodiment, a partition plate is installed between the low-pressure pressure taking pipe and the low-pressure outer cover.

[0015] In a further embodiment, the high-pressure pressure taking pipe is provided with a plurality of high-pressure pressure taking holes, and the directions of the high-pressure pressure taking holes are perpendicular to the length direction of the isolation plate;

[0016] A plurality of low-pressure holes are respectively provided on both sides of the high-pressure pipe, and the directions of the low-pressure holes are parallel to the length direction of the isolation plate.

[0017] In a further embodiment, the high-pressure outer cover is evenly provided with high-pressure notches along its length, so that a preset number of high-pressure pressure holes are exposed to the airflow; the low-pressure outer cover is evenly provided with low-pressure notches along its length, so that a preset number of low-pressure pressure holes are exposed to the airflow.

[0018] In a further embodiment, a plurality of the isolation panels are connected end to end to form a linear structure.

[0019] In a further embodiment, a plurality of connecting rods are included, and the ends of the pressure-taking pipes in the pressure zone on the same side are simultaneously connected to the connecting rods to form a planar structure combination; the connecting rods are pipeline structures, and the connecting rods are provided with at least one output end.

[0020] Beneficial effects:

[0021] 1. This application uses a low-pressure outer cover in combination with a tail wing to effectively eliminate the Karman vortex, thereby stabilizing the pressure signal in the low-pressure area and thus stabilizing the pressure difference obtained in fluid detection.

[0022] 2. This application effectively isolates most of the particulate matter in the airflow through the high-pressure outer cover and the low-pressure outer cover, thereby extending the service life of the pressure collection tube and stabilizing the pressure.

[0023] 2. This application improves the series and parallel structures of the structural dustproof flow measurement device to obtain the pressure difference signal, input it into the pressure difference sensor, and the output result is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of this application.

[0025] Figure 2 It is a schematic diagram of the structural principle of this application.

[0026] Figure 3 It is a schematic diagram of the high-pressure pressure pipe of this application.

[0027] Figure 4 It is a schematic diagram of the low-pressure pressure-taking pipe of this application.

[0028] Figure 5 It is a schematic diagram of the high-voltage outer cover of this application.

[0029] Figure 6 It is a schematic diagram of the low-pressure outer cover of this application.

[0030] Figure 7 It is a schematic diagram of the serial scheme structure of this application.

[0031] Figure 8 This is a schematic diagram of the parallel scheme structure of this application.

[0032] The reference numerals in the figure are: airflow 1, isolation plate 2, high-pressure area 3, low-pressure area 4, high-pressure pressure taking pipe 5, low-pressure pressure taking pipe 6, high-pressure pressure taking hole 7, low-pressure pressure taking hole 8, high-pressure outer cover 9, low-pressure outer cover 10, tail wing 11, partition plate 12, connecting rod 13, differential pressure sensor 14. DETAILED DESCRIPTION

[0033] In the following description, numerous specific details are provided to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features known in the art are not described to avoid confusion with the present invention.

[0034] Example 1

[0035] Based on the problems mentioned in the background technology, compared with the above-mentioned existing technologies, the purpose of the improved solution of this application is to prevent dust, thereby obtaining a stable signal difference, and further effectively eliminate the Karman vortex generated by the isolation plate 2. Furthermore, the device is compatible with the traditional array structure, and can collect stable pressure difference signals, thereby accurately obtaining the corresponding gas flow data.

[0036] like Figure 1 As shown, the solution of this technology is that an isolation plate 2 is used to obtain a pressure difference on both sides, and the gas flows through the isolation plate 2 to form a high-pressure area 3 and a low-pressure area 4. A high-pressure pressure-taking pipe 5 is installed in the high-pressure area 3, and a low-pressure pressure-taking pipe 6 is installed in the low-pressure area 4. A low-pressure outer cover 10 is installed on the outside of the low-pressure pressure-taking pipe 6. The two ends of the low-pressure outer cover 10 adopt a wedge-shaped design, and a tail 11 is installed on the outermost side of the low-pressure outer cover 10. Then the airflow 1 flows through both sides of the isolation plate 2 to generate two low-pressure airflows, which flow through both sides of the low-pressure outer cover 10 respectively, and then flow through the tail 11. Then the low-pressure airflow 1 or vortex generated on both sides of the isolation plate 2 to the end of the tail wing 11 is relatively symmetrical, which effectively solves the alternating interference phenomenon in the Karman vortex, thereby making the low-pressure signal collected by the low-pressure pressure-taking pipe 6 relatively stable, so that the signal collected by the differential pressure sensor 14 is more accurate and stable.

[0037] A partition plate 12 is installed between the low-pressure taking pipe 6 and the low-pressure outer cover 10 to isolate the airflow 1 and form two low-pressure areas 4, which are collected by the low-pressure taking holes 8 on both sides of the low-pressure taking pipe 6 respectively.

[0038] In a further optimization solution, the extension length of the tail wing 11 along the direction of the airflow 1 is greater than or equal to the width of the isolation plate 2 .

[0039] As a further optimization solution, both sides of the connection between the tail wing 11 and the low-pressure curved outer cover are rounded.

[0040] like Figures 2 to 3 As shown, the high-pressure pressure taking pipe 5 is provided with a plurality of high-pressure pressure taking holes 7, and the direction of the high-pressure pressure taking holes 7 is perpendicular to the length direction of the isolation plate 2. A plurality of low-pressure pressure taking holes 8 are respectively provided on both sides of the high-pressure pressure taking pipe 5, and the direction of the low-pressure pressure taking holes 8 is parallel to the length direction of the isolation plate 2.

[0041] Example 2

[0042] Since there are many particles to be measured, based on the technical solution of Example 1, this application installs a high-pressure outer cover 9 in the high-pressure area 3 to form a wrapping structure for isolating most of the particles. The high-pressure pressure pipe 5 is located in the high-pressure outer cover 9, and the two ends of the high-pressure outer cover 9 are designed to be wedge-shaped, such as Figure 4 shown.

[0043] Furthermore, when used in combination with the low-pressure outer cover 10, the particulate matter in the low-pressure area 4 is further reduced, and the two ends of the low-pressure outer cover 4 are also wedge-shaped, such as Figure 5 As shown, the partition plates 12 are installed corresponding to the recessed portions of the wedge-shaped area, forming two wedge-shaped structures corresponding to the two low-pressure areas 4 .

[0044] Example 3

[0045] This solution is the first expansion solution based on implementation 1 and embodiment 2, which is a series solution. Figure 8 As shown, the program includes:

[0046] 1. A high-pressure outer cover 9 and a low-pressure outer cover 10 are respectively installed on an isolation plate 2. The high-pressure outer cover 9 is uniformly provided with high-pressure notches along its length, and the low-pressure outer cover 10 is uniformly provided with low-pressure notches along its length. This allows more sampling areas of the high-pressure pressure taking pipe 5 and the low-pressure pressure taking pipe 8 located in the middle of the high-pressure outer cover 9 and the low-pressure outer cover 10 to be exposed to the airflow 1. This scheme makes the pressure differential sampling more accurate.

[0047] 2. Connect the isolation plates 2 end to end to extend the length of the sampling end. This solution is similar to the above solution.

[0048] In this solution, the final sampling signal difference is less affected by the pressure at the sampling end, and gas is very sensitive to pressure conduction.

[0049] Example 4

[0050] This solution is a second expansion solution based on Implementation 1 and Implementation 2. It is a parallel solution and includes:

[0051] A plurality of connecting rods 13 are used to connect various sampling ends. Such connecting rods 13 are pipeline structures and are provided with an output end. Figure 8 As shown, the two connecting rods 13 respectively sample the high pressure and low pressure in a centralized manner, and input the high pressure and low pressure signals into the differential pressure sensor 14. A plurality of such sampling structures are combined horizontally on the plane to increase the sampling plane area and form a large-scale sampling to adapt to the pressure differential sampling of large-diameter pipelines.

[0052] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be interpreted as limiting the present invention itself. Various changes may be made to it in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. A dustproof flow measuring device, characterized in that: include: An isolation plate is used to separate the airflow to form a high-pressure area and a low-pressure area on both sides of the isolation plate; A high-pressure pressure pipe is connected to the isolation plate and is arranged in the high-pressure area; A low-pressure tapping pipe, connected to the isolation plate and disposed in the low-pressure area; A low-pressure outer cover is connected to the isolation plate and is disposed in the low-pressure area; the low-pressure pressure pipe is located in the low-pressure outer cover; The tail wing is connected to the outermost side of the low-pressure outer cover.

2. The dust-proof flow measurement device according to claim 1, characterized in that: Both sides of the connection between the tail wing and the low-pressure curved outer cover are rounded.

3. The dust-proof flow measurement device according to claim 1, wherein: The extension length of the tail wing along the airflow direction is greater than or equal to the width of the isolation plate.

4. The dust-proof flow measurement device according to claim 1, wherein: It also includes a high-pressure outer cover, which is installed in the high-pressure area and wrapped around the high-pressure pressure pipe; both ends of the high-pressure outer cover are designed to be wedge-shaped.

5. The dust-proof flow measurement device according to claim 1, wherein: A partition plate is installed between the low-pressure pressure taking pipe and the low-pressure outer cover.

6. The dust-proof flow measurement device according to claim 1, wherein: The high-pressure pressure taking pipe is provided with a plurality of high-pressure pressure taking holes, and the directions of the high-pressure pressure taking holes are perpendicular to the length direction of the isolation plate; A plurality of low-pressure holes are respectively provided on both sides of the high-pressure pipe, and the directions of the low-pressure holes are parallel to the length direction of the isolation plate.

7. The dust-proof flow measurement device according to claim 4, wherein: The high-pressure outer cover is evenly provided with high-pressure notches along its length, so that a preset number of high-pressure pressure holes are exposed to the airflow; the low-pressure outer cover is evenly provided with low-pressure notches along its length, so that a preset number of low-pressure pressure holes are exposed to the airflow.

8. The dust-proof flow measurement device according to claim 4, wherein: The plurality of isolation plates are connected end to end to form a linear structure.

9. The dust-proof flow measurement device according to claim 4, wherein: It also includes multiple connecting rods, and the ends of the pressure-taking pipes in the pressure zone on the same side are simultaneously connected to the connecting rods to form a planar structural combination; the connecting rods are pipeline structures, and the connecting rods are provided with at least one output end.

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