Square throat runoff measuring device

Abstract

The utility model provides a square throat runoff measuring device. The square throat runoff measuring device is characterized in that a first measuring tube and a second measuring tube are respectively arranged at the center of a mounting flange; a plurality of static pressure measuring mechanisms and / or dynamic pressure measuring mechanisms are uniformly arranged on the first measuring tube or the second measuring tube, pressure guiding tubes are connected between the static pressure measuring mechanisms and the first measuring tube or the second measuring tube, and the dynamic pressure measuring mechanisms are sequentially arranged on the first measuring tube or the second measuring tube in a sleeving mode. Pressure tapping holes are formed in the positions, provided with the dynamic pressure measuring mechanisms, of the first measuring pipe or the second measuring pipe respectively. According to the utility model, a plurality of the dynamic pressure measuring mechanisms and the static pressure measuring mechanisms can be respectively arranged on the first measuring pipe and the second measuring pipe in a mixed manner, so that data measured by the dynamic pressure measuring mechanisms and the static pressure measuring mechanisms can be obtained at the same time, and corresponding setting can be carried out according to the actual condition of the pipeline; the defect that the device cannot be used in a low-flow-speed pipeline is overcome.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline flow measurement, in particular to a square throat diameter flow measurement device. Background Art

[0002] At present, in the power, metallurgy, petrochemical and other industries, due to equipment operation and process requirements, there are a large number of gas pipelines, and the flow of gas in the pipelines needs to be measured; however, there are many problems in the actual flow measurement process:

[0003] 1. Conventional flow measurement devices have high requirements for straight pipe sections, requiring 5 to 8D (D represents the nominal diameter of the pipe), but the straight pipe section of the on-site pipeline is very short and cannot meet the requirements of the measurement specifications, resulting in inaccurate measurement;

[0004] 2. The number of points of traditional measuring devices in the pipeline is limited, and the average flow velocity of the pipeline cannot be obtained, which affects the measurement accuracy;

[0005] 3. The traditional matrix flow measurement device has a very small output differential pressure due to its compact structure, and cannot be used, especially in low-flow pipelines;

[0006] 4. The medium in the pipeline is mostly dusty gas. Due to the structural problems of conventional dynamic pressure flow measurement devices, all of its dynamic pressure holes are facing the direction of gas flow, so that the granular substances in the gas directly enter the measuring tube, and the dynamic pressure tube is often blocked, affecting the normal use of the measuring device; and the dynamic pressure hole opening of the conventional flow measurement device is small, which is easily directly blocked by the larger particles in the dusty gas, resulting in inaccurate measurement results. Therefore, the utility model proposes a square throat diameter flow measurement device to improve the above problems. Utility Model Content

[0007] Therefore, the technical problem to be solved by the utility model is to overcome the defect that the square throat flow measurement device in the prior art has a very small output differential pressure and cannot be used in low flow rate pipelines, thereby providing a square throat flow measurement device.

[0008] In order to solve the above problems, the utility model provides a square throat flow measurement device, which is arranged in a measured pipeline, wherein a fixed flange is arranged in the measured pipeline, and the square throat flow measurement device is detachably connected to the fixed flange, comprising:

[0009] A mounting flange, wherein the mounting flange is detachably connected to the fixing flange, and a first measuring tube and a second measuring tube are respectively arranged at the center of the mounting flange;

[0010] A plurality of static pressure measuring mechanisms and / or dynamic pressure measuring mechanisms are evenly arranged on the first measuring tube or the second measuring tube, respectively. A pressure-guiding tube is connected between the static pressure measuring mechanism and the first measuring tube or the second measuring tube, respectively, to achieve the connection between the static pressure measuring mechanism and the first measuring tube or the second measuring tube. The dynamic pressure measuring mechanisms are respectively sleeved on the first measuring tube or the second measuring tube in sequence, and pressure holes are respectively arranged on the first measuring tube or the second measuring tube where the dynamic pressure measuring mechanisms are respectively arranged.

[0011] Preferably, the static pressure measuring mechanism includes a first square tube, and an inner plate 1 and an inner plate 2 are respectively arranged at the top and bottom of the first square tube, and the inner plate 1 and the inner plate 2 both include a first bevel, a horizontal edge and a second bevel, and the first bevel, the horizontal edge and the second bevel of the inner plate 1 and the inner plate 2 are sequentially arranged from one end to the other end of the first square tube; a pressure taking cylinder is arranged at the center of the horizontal edge of the inner plate 1, and the two ends of the pressure taking cylinder are respectively connected to the top of the first square tube and the center of the horizontal edge of the inner plate 1, and one end of the pressure-taking tube is arranged above the pressure-taking cylinder and is connected to one end of the pressure-taking tube.

[0012] Preferably, the angles between the first beveled edge and the second beveled edge of the inner plate 1 and the inner plate 2 and the top and bottom of the first square tube are in the range of 10° to 40°.

[0013] Preferably, the dynamic pressure measuring mechanism includes a second square tube, the opening direction of the second square tube is on the same straight line as the direction of the pressure taking hole, the top and bottom of the second square tube respectively penetrate the first measuring tube or the second measuring tube, the pressure taking holes are respectively located in the second square tube, and a baffle is provided at one end of the second square tube opposite to the opening of the pressure taking hole, and the two ends of the baffle are respectively set with a gap between the inner wall of the second square tube.

[0014] Preferably, the baffle is a V-shaped plate, both ends of the V-shaped plate are respectively provided with gaps with the inner wall of the second square tube, and the sharp end of the V-shaped plate faces the pressure taking hole.

[0015] Preferably, the first measuring tube and the second measuring tube are respectively provided with a first joint and a second joint at one end close to the mounting flange, and the first measuring tube and the second measuring tube are closed at one end away from the mounting flange.

[0016] Preferably, a plurality of symmetrically arranged static pressure measuring mechanisms are respectively arranged on the first measuring tubes, one end of the pressure-guiding tubes of the static pressure measuring mechanisms are respectively connected to the first measuring tubes, and the other end of the pressure-guiding tubes are respectively connected to the first square tubes above the pressure-taking cylinders, so as to connect the pressure-guiding tubes and the pressure-taking cylinders;

[0017] The second measuring tube is provided with a plurality of dynamic pressure measuring mechanisms corresponding to the static pressure measuring mechanisms. The second square tubes of the dynamic pressure measuring mechanisms penetrate the second measuring tube respectively. The orientation of the second square tubes is the same as that of the first square tubes.

[0018] Preferably, a plurality of dynamic pressure measuring mechanisms are respectively arranged on the first measuring tube, the second square tubes of the dynamic pressure measuring mechanisms respectively penetrate the first measuring tube, and one end of the second measuring tube away from the mounting flange is connected to the first measuring tube.

[0019] Preferably, a plurality of symmetrically arranged static pressure measuring mechanisms are respectively arranged on the first measuring tube, one end of the pressure-guiding tube of the static pressure measuring mechanism is respectively connected with the first measuring tube, the other end of the pressure-guiding tube is respectively connected with the first square tube above the pressure-taking cylinder to connect the pressure-guiding tube and the pressure-taking cylinder, and the end of the second measuring tube away from the mounting flange is connected with the first measuring tube.

[0020] The square throat flow measurement device provided by the utility model has the following beneficial effects:

[0021] 1. The utility model can also mix and set multiple dynamic pressure measuring mechanisms and static pressure measuring mechanisms in the first measuring tube and the second measuring tube respectively, so as to obtain data measured by multiple dynamic pressure measuring mechanisms and static pressure measuring mechanisms at the same time, so that corresponding settings can be made according to the actual situation of the pipeline, so as to overcome the defect that it cannot be used in low flow rate pipelines;

[0022] 2. The utility model also introduces the gas passing through the pressure-taking tube into the pressure-leading tube through the pressure-taking tube at the center of the horizontal side of the inner plate 1, and connects the gas to the first measuring tube or the second measuring tube through the pressure-leading tube for pressure mixing, so as to realize the sampling measurement of the measured pipeline by the static pressure measuring mechanism, reduce the negative pressure value, improve the overall differential pressure output value of the measuring device, and reduce the influence of the straight pipe section and low flow rate on the measurement result;

[0023] 3. The utility model also sets a gap between the two ends of the baffle and the inner wall of the second square tube respectively, so that the gas or impurities can pass through the gap, and part of the gas enters the first measuring tube or the second measuring tube through the pressure holes arranged opposite to the baffle, and is mixed with pressure therein to realize the sampling measurement of the measured pipeline by the dynamic pressure measuring mechanism. The setting of the pressure holes and the baffle avoids the pressure holes from being opposite to the flow direction of the gas, and avoids the larger particles in the gas from directly clogging the pressure holes. Through this design, it is ensured that the dynamic pressure measuring mechanism is not blocked. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1It is a schematic diagram of the first three-dimensional structure of the utility model;

[0025] Figure 2 This is a schematic diagram of the installation of the pressure-guiding pipe structure of the utility model;

[0026] Figure 3 This is a schematic diagram of the installation of the pressure-taking cylinder structure of the utility model;

[0027] Figure 4 This is a schematic diagram of the installation of the pressure-taking hole structure of the utility model;

[0028] Figure 5 It is a three-dimensional schematic diagram of the first structure of the utility model;

[0029] Figure 6 It is a side view of the first structure of the utility model;

[0030] Figure 7 It is a three-dimensional schematic diagram of the second structure of the utility model;

[0031] Figure 8 It is a side view of the second structure of the utility model.

[0032] The reference numerals are:

[0033] 1. Fixed flange; 2. Mounting flange; 3. First measuring tube; 4. Second measuring tube; 5. Pressure-guiding tube; 6. Pressure-taking hole; 7. First square tube; 8. Inner plate one; 9. Inner plate two; 10. First bevel; 11. Horizontal edge; 12. Second bevel; 13. Pressure-taking cylinder; 14. Second square tube; 15. Baffle; 16. First joint; 17. Second joint. DETAILED DESCRIPTION

[0034] like Figure 1-8 As shown, the utility model provides a square throat flow measurement device, which includes:

[0035] A square throat flow measurement device is provided in a measured pipeline, wherein a fixed flange 1 is provided in the measured pipeline, and the square throat flow measurement device is detachably connected to the fixed flange 1, comprising:

[0036] A mounting flange 2, wherein the mounting flange 2 is detachably connected to the fixing flange 1, and a first measuring tube 3 and a second measuring tube 4 are respectively arranged at the center of the mounting flange 2;

[0037] Static pressure measuring mechanisms and / or dynamic pressure measuring mechanisms are evenly arranged on the first measuring tube 3 or the second measuring tube 4, respectively. A pressure-guiding pipe 5 is connected between the static pressure measuring mechanism and the first measuring tube 3 or the second measuring tube 4 to achieve the connection between the static pressure measuring mechanism and the first measuring tube 3 or the second measuring tube 4. The dynamic pressure measuring mechanism is respectively sleeved on the first measuring tube 3 or the second measuring tube 4 in sequence. The first measuring tube 3 or the second measuring tube 4 is respectively provided with a pressure-taking hole 6 at the location where the dynamic pressure measuring mechanism is provided. Figure 1-8 As shown, a square-throat flow measurement device is used to measure the flow of gas in a measured pipeline, wherein a fixed flange 1 is arranged in the measured pipeline, and the square-throat flow measurement device and the fixed flange 1 are detachably connected to provide an installation position thereof; wherein the square-throat flow measurement device includes a mounting flange 2, and the mounting flange 2 and the fixed flange 1 can be bolted or flanged, and the shapes of the mounting flange 2 and the fixed flange 1 can be square or circular, and a first measuring tube 3 and a second measuring tube 4 arranged at the center of the mounting flange are used for taking gas during measurement; wherein, a plurality of static pressure measurement mechanisms and / or dynamic pressure measurement mechanisms that are combined or separately arranged can be arranged according to actual conditions, wherein the gas of a plurality of static pressure measurement mechanisms is introduced into the first measuring tube 3 or the second measuring tube 4 through a pressure-leading tube 5 between the static pressure measurement mechanism and the first measuring tube 3 or the second measuring tube 4 to realize the control of the plurality of static pressure measurement mechanisms. Mixed pressure, and finally signal processing and calculation are carried out through the differential pressure transmitter connected to the first measuring tube 3 or the second measuring tube 4; the dynamic pressure measuring mechanisms are respectively and sequentially sleeved on the first measuring tube 3 or the second measuring tube 4, and the dynamic pressure measuring mechanisms are connected to the first measuring tube 3 or the second measuring tube 4 through the corresponding pressure taking holes 6 arranged on the first measuring tube 3 or the second measuring tube 4, so as to introduce the gases of multiple dynamic pressure measuring mechanisms into the first measuring tube 3 or the second measuring tube 4 to achieve mixed pressure of multiple dynamic pressure measuring mechanisms, and finally signal processing and calculation are carried out through the differential pressure transmitter connected to the first measuring tube 3 or the second measuring tube 4; the dynamic pressure measuring mechanisms and the static pressure measuring mechanisms can also be mixedly arranged in multiple in the first measuring tube 3 and the second measuring tube 4, so as to obtain the data measured by multiple dynamic pressure measuring mechanisms and static pressure measuring mechanisms at the same time, so that corresponding settings can be made according to the actual situation of the pipeline to overcome the defect that it cannot be used in low flow rate pipelines.

[0038] In some embodiments, the static pressure measuring mechanism includes a first square tube 7, and an inner plate 1 8 and an inner plate 2 9 are respectively arranged at the top and bottom of the first square tube 7, and the inner plate 1 8 and the inner plate 2 9 both include a first bevel 10, a horizontal edge 11 and a second bevel 12. The inner plate 1 8 and the first bevel 10, the horizontal edge 11 and the second bevel 12 of the inner plate 1 8 are arranged in sequence from one end to the other end of the first square tube 7; a pressure-taking tube 13 is arranged at the center of the horizontal edge 11 of the inner plate 1 8, and the two ends of the pressure-taking tube 13 are respectively connected to the top of the first square tube 7 and the center of the horizontal edge 11 of the inner plate 1 8, and one end of the pressure-taking tube 5 is arranged above the pressure-taking tube 13 and is connected to one end of the pressure-taking tube 5. Figure 1-8 As shown, the first square tube 7 in the static pressure measuring mechanism samples the gas in the measured pipeline, wherein the area between the inner plate 1 8 and the inner plate 2 9 at the top and bottom of the first square tube 7 is used for gas circulation, which avoids the problem of blockage in static pressure measurement sampling, wherein the inner plate 1 8 and the inner plate 2 9 are both composed of a first bevel 10, a horizontal edge 11 and a second bevel 12, and the angles between the first bevel 10 and the second bevel 12 and the first square tube 7 can be adjusted to meet the circulation of the gas and the attachment of impurities in the gas, and the pressure-taking tube 13 at the center of the horizontal edge 11 of the inner plate 1 8 introduces the gas passing through into the pressure-taking tube 5 through the pressure-taking tube 13, and is respectively connected to the first measuring tube 3 or the second measuring tube 4 through the pressure-taking tube 5 for mixed pressure, so as to realize the static pressure measuring mechanism for sampling and measuring the measured pipeline, and reduce the negative pressure value, improve the overall differential pressure output value of the measuring device, and reduce the influence of the straight pipe section and low flow rate on the measurement result.

[0039] In some embodiments, the angles between the first bevel 10 and the second bevel 12 of the inner plate 1 8 and the top and bottom of the first square tube 7 are in the range of 10° to 40°. Figure 1-8 As shown, the angles between the first bevel 10 and the second bevel 12 located on the inner plate 1 8 and the inner plate 2 9 and the top and bottom of the first square tube 7 are in the range of 10° to 40°, within which the gas can flow smoothly to avoid blockage. At the same time, impurities can be attached to the first bevel 10 and the second bevel 12 to avoid further entering the pressure-inducing pipe 5 with the flow of gas.

[0040] In some embodiments, the dynamic pressure measuring mechanism includes a second square tube 14, the opening direction of the second square tube 14 is in the same straight line as the direction of the pressure taking hole 6, the top and bottom of the second square tube 14 respectively penetrate the first measuring tube 3 or the second measuring tube 4, the pressure taking hole 6 is respectively located in the second square tube 14, and a baffle 15 is provided at one end of the second square tube 14 opposite to the opening of the pressure taking hole 6, and the two ends of the baffle 15 are respectively set with a gap between the inner wall of the second square tube 14. Figure 1-8 As shown, the dynamic pressure measuring mechanism samples the gas in the measured pipeline through the second square tube 14, wherein the opening direction of the second square tube 14 and the direction of the pressure taking hole 6 are in a straight line, and a baffle 15 is provided at one end of the second square tube 14 opposite to the opening of the pressure taking hole 6, and the two ends of the baffle 15 are respectively provided with gaps with the inner wall of the second square tube 14, and the gaps allow the gas or impurities to pass through, and part of the gas enters the first measuring tube 3 or the second measuring tube 4 through the pressure taking hole 6 opposite to the baffle 15, and is mixed with pressure therein to realize the sampling measurement of the measured pipeline by the dynamic pressure measuring mechanism, wherein the setting of the pressure taking hole 6 and the baffle 15 avoids the pressure taking hole 6 from being opposite to the flow direction of the gas, and avoids the larger particles in the gas from directly blocking the pressure taking hole 6, and through this design, it is ensured that the dynamic pressure measuring mechanism is not blocked.

[0041] In some embodiments, the baffle 15 is a V-shaped plate, and both ends of the V-shaped plate are respectively provided with a gap with the inner wall of the second square tube 14, and the sharp end of the V-shaped plate faces the pressure-taking hole 6. Figure 1-8 As shown, the baffle 15 is a V-shaped plate, and a gap is formed between the two ends of the V-shaped plate and the inner wall of the second square tube 14, wherein the sharp end of the V-shaped plate faces the pressure-taking hole 6. When located in the measured pipeline, after the dynamic pressure measuring mechanism takes pressure, the second square tube 14 is arranged so that the side with the baffle 15 faces away from the flow direction of the gas in the measured pipeline, so that the gas passing through the second square tube 14 passes through the outside of the first measuring tube 3 or the second measuring tube 4, and continues to flow along the gaps on both sides of the sharp end of the V-shaped plate, wherein larger dust particles in the gas are blown out of the second square tube 14 through the gaps on both sides, and part of the gas enters the first measuring tube 3 or the second measuring tube 4 through the pressure-taking hole 6 arranged opposite to the baffle 15, and is mixed with pressure therein, so as to realize the sampling measurement of the measured pipeline by the dynamic pressure measuring mechanism, which can effectively improve the measured dynamic pressure value, improve the overall differential pressure output value of the device, and reduce the influence of the straight pipe section and low flow rate on the measurement result.

[0042] In some embodiments, the first measuring tube 3 and the second measuring tube 4 are respectively provided with a first joint 16 and a second joint 17 at one end close to the mounting flange 2, and the first measuring tube 3 and the second measuring tube 4 are closed at one end away from the mounting flange 2. Figure 1-8As shown, when the first measuring tube 3 and the second measuring tube 4 are measuring, the first joint 16 and the second joint 17 of the first measuring tube 3 and the second measuring tube 4 are conveniently connected to the measuring tube of the differential pressure transmitter, wherein the first joint 16 and the second joint 17 are commercially available, and the first measuring tube 3 and the second measuring tube 4 are closed at one end away from the mounting flange 2, so that after the first measuring tube 3 and the second measuring tube 4 obtain the gas of the dynamic pressure measuring mechanism and the static pressure measuring mechanism, the gas flows toward the end with the first joint 16 and the second joint 17, and finally flows to the differential pressure transmitter for subsequent processing and measurement.

[0043] In some embodiments, a plurality of symmetrically arranged static pressure measuring mechanisms are respectively arranged on the first measuring tube 3, one end of the pressure-guiding tube 5 of the static pressure measuring mechanism is respectively connected to the first measuring tube 3, and the other end of the pressure-guiding tube 5 is respectively connected to the first square tube 7 above the pressure-taking cylinder 13, so as to connect the pressure-guiding tube 5 and the pressure-taking cylinder 13;

[0044] The second measuring tube 4 is provided with a plurality of dynamic pressure measuring mechanisms corresponding to the static pressure measuring mechanisms, and the second square tubes of the dynamic pressure measuring mechanisms respectively penetrate the second measuring tube 4, and the orientation of the second square tubes is the same as that of the first square tubes. Figure 1-2 As shown, when the dynamic pressure measuring mechanism and the static pressure measuring mechanism are arranged in multiple groups in the form of a combination, the dynamic pressure and the static pressure can be measured simultaneously, wherein the first measuring tube 3 is respectively provided with multiple groups of static pressure mechanisms which are arranged symmetrically along the first measuring tube 3, and the static pressure mechanisms are respectively connected with the first measuring tube 3 through the pressure-leading tube 5, and the other ends of the pressure-leading tubes 5 are respectively connected with the first square tube 7 above the pressure-taking cylinder 13 to connect the pressure-leading tube 5 and the pressure-taking cylinder 13, so as to measure the gas in the measured pipeline by the static pressure mechanism; the dynamic pressure measuring mechanism is arranged on the second measuring tube 4 corresponding to the static pressure measuring mechanism, and the second square tubes of the dynamic pressure measuring mechanism respectively penetrate the second measuring mechanism, and the orientation of the second square tube is the same as that of the first square tube, so that the dynamic pressure in the measured pipeline is measured through the second square tube.

[0045] In some embodiments, a plurality of dynamic pressure measuring mechanisms are respectively arranged on the first measuring tube 3, the second square tubes of the dynamic pressure measuring mechanisms respectively penetrate the first measuring tube 3, and the end of the second measuring tube 4 away from the mounting flange 2 is connected to the first measuring tube 3. Figure 7-8As shown, when only the dynamic pressure measuring mechanism is provided, a plurality of dynamic pressure measuring mechanisms are installed on the first measuring tube 3 along equidistant intervals, wherein the second square tube 14 of the dynamic pressure measuring mechanism is installed on the first measuring tube 3 at equidistant intervals, and the end of the second measuring hanging device away from the mounting flange 2 is connected to the first measuring tube 3 to form a bypass pipeline of the first measuring tube 3, wherein the position where the second measuring tube 4 is connected to the first measuring tube 3 can be the middle, upper middle or lower middle position of the first measuring tube 3. In this mechanism, the first measuring tube 3 is the outlet of the dynamic pressure measuring mechanism and is connected to the differential pressure transmitter pipeline, the second measuring tube 4 is not connected and is blocked, and at the same time, the second measuring tube 4 can be connected to an external purge device, and the purge device is used to back-purge the entire device to prevent blockage inside the entire device after cleaning.

[0046] In some embodiments, the first measuring tube 3 is provided with multiple groups of symmetrically arranged static pressure measuring mechanisms, one end of the pressure-inducing tube 5 of the static pressure measuring mechanism is connected to the first measuring tube 3, and the other end of the pressure-inducing tube 5 is connected to the first square tube 7 above the pressure-taking cylinder 13 to connect the pressure-inducing tube 5 and the pressure-taking cylinder 13, and the end of the second measuring tube 4 away from the mounting flange 2 is connected to the first measuring tube 3. Figure 5-6 As shown, when only the static pressure measuring mechanism is provided, a plurality of groups of static pressure measuring mechanisms are respectively installed on the first measuring tube 3 which are symmetrical along the left and right sides of the first measuring tube 3, and the pressure-leading tubes 5 of the static pressure measuring mechanism are respectively connected to the first square tube 7 above the pressure-taking cylinder 13 to connect the pressure-leading tube 5 and the pressure-taking cylinder 13, so as to measure the gas in the measured pipeline by the static pressure mechanism; the position where the second measuring tube 4 is connected to the first measuring tube 3 can be the middle, upper middle or lower middle position of the first measuring tube 3. In this mechanism, the first measuring tube 3 is the outlet of the static pressure measuring mechanism and is connected to the differential pressure transmitter pipeline, the second measuring tube 4 is not connected and is blocked, and at the same time, the second measuring tube 4 can be connected to an external purge device, and the purge device is used to back-purge the entire device to prevent blockage inside the entire device after cleaning.

[0047] The above is only a preferred embodiment of the utility model, and is not intended to limit the utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the utility model should be included in the protection scope of the utility model. The above is only a preferred implementation of the utility model. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the utility model, and these improvements and variations should also be regarded as the protection scope of the utility model.

Claims

1. A square throat flow measurement device, arranged in a measured pipeline, wherein a fixed flange is arranged in the measured pipeline, and the square throat flow measurement device is detachably connected to the fixed flange, characterized in that: include: A mounting flange, wherein the mounting flange is detachably connected to the fixing flange, and a first measuring tube and a second measuring tube are respectively arranged at the center of the mounting flange; A plurality of static pressure measuring mechanisms and / or dynamic pressure measuring mechanisms are evenly arranged on the first measuring tube or the second measuring tube, respectively. A pressure-guiding tube is connected between the static pressure measuring mechanism and the first measuring tube or the second measuring tube, respectively, to achieve the connection between the static pressure measuring mechanism and the first measuring tube or the second measuring tube. The dynamic pressure measuring mechanisms are respectively sleeved on the first measuring tube or the second measuring tube in sequence, and pressure holes are respectively arranged on the first measuring tube or the second measuring tube where the dynamic pressure measuring mechanisms are respectively arranged.

2. The square throat flow measurement device according to claim 1, characterized in that: The static pressure measuring mechanism includes a first square tube, and an inner plate 1 and an inner plate 2 are respectively arranged at the top and bottom of the first square tube, and the inner plate 1 and the inner plate 2 both include a first oblique edge, a horizontal edge and a second oblique edge, and the first oblique edge, the horizontal edge and the second oblique edge of the inner plate 1 and the inner plate 2 are arranged in sequence from one end to the other end of the first square tube; a pressure taking cylinder is arranged at the center of the horizontal edge of the inner plate 1, and the two ends of the pressure taking cylinder are respectively connected to the top of the first square tube and the center of the horizontal edge of the inner plate 1, and one end of the pressure-taking tube is arranged above the pressure-taking cylinder and is connected to one end of the pressure-taking tube.

3. The square throat flow measurement device according to claim 2, characterized in that: The included angles between the first beveled edge and the second beveled edge of the inner plate 1 and the inner plate 2 and the top and bottom of the first square tube are in the range of 10° to 40°.

4. The square throat flow measurement device according to claim 2, characterized in that: The dynamic pressure measuring mechanism includes a second square tube, the opening direction of the second square tube is on the same straight line as the direction of the pressure taking hole, the top and bottom of the second square tube respectively penetrate the first measuring tube or the second measuring tube, the pressure taking holes are respectively located in the second square tube, and a baffle is provided at one end of the second square tube opposite to the opening of the pressure taking hole, and the two ends of the baffle are respectively set with a gap between them and the inner wall of the second square tube.

5. The square throat flow measurement device according to claim 4, characterized in that: The baffle is a V-shaped plate, both ends of which are respectively provided with gaps with the inner wall of the second square tube, and the sharp end of the V-shaped plate faces the pressure taking hole.

6. The square throat flow measurement device according to claim 1, characterized in that: The first measuring tube and the second measuring tube are respectively provided with a first joint and a second joint at one end close to the mounting flange, and the first measuring tube and the second measuring tube are closed at one end away from the mounting flange.

7. The square throat flow measurement device according to claim 4, characterized in that: A plurality of symmetrically arranged static pressure measuring mechanisms are respectively arranged on the first measuring tubes, one end of the pressure-inducing tubes of the static pressure measuring mechanisms are respectively connected to the first measuring tubes, and the other end of the pressure-inducing tubes are respectively connected to the first square tubes above the pressure-taking cylinders, so as to connect the pressure-inducing tubes and the pressure-taking cylinders; The second measuring tube is provided with a plurality of dynamic pressure measuring mechanisms corresponding to the static pressure measuring mechanisms. The second square tubes of the dynamic pressure measuring mechanisms penetrate the second measuring tube respectively. The orientation of the second square tubes is the same as that of the first square tubes.

8. The square throat flow measurement device according to claim 4, characterized in that: A plurality of dynamic pressure measuring mechanisms are respectively arranged on the first measuring tubes. The second square tubes of the dynamic pressure measuring mechanisms respectively penetrate the first measuring tubes. One end of the second measuring tube away from the mounting flange is communicated with the first measuring tube.

9. The square throat flow measurement device according to claim 4, characterized in that: A plurality of symmetrically arranged static pressure measuring mechanisms are respectively arranged on the first measuring tube, one end of the pressure-guiding tube of the static pressure measuring mechanism is respectively connected with the first measuring tube, the other end of the pressure-guiding tube is respectively connected with the first square tube above the pressure-taking cylinder to connect the pressure-guiding tube and the pressure-taking cylinder, and one end of the second measuring tube away from the mounting flange is connected with the first measuring tube.

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