CN222104804U - An ultra-wide range, high-precision, long-life Venturi flow measurement device - Google Patents
An ultra-wide range, high-precision, long-life Venturi flow measurement device Download PDFInfo
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- CN222104804U CN222104804U CN202420908889.2U CN202420908889U CN222104804U CN 222104804 U CN222104804 U CN 222104804U CN 202420908889 U CN202420908889 U CN 202420908889U CN 222104804 U CN222104804 U CN 222104804U
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- 238000005259 measurement Methods 0.000 title claims abstract description 27
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 21
- 238000001514 detection method Methods 0.000 claims abstract description 15
- 238000005070 sampling Methods 0.000 claims 2
- 238000010079 rubber tapping Methods 0.000 claims 1
- 239000012530 fluid Substances 0.000 description 14
- 238000010586 diagram Methods 0.000 description 5
- 238000009530 blood pressure measurement Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
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- 238000005265 energy consumption Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
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Abstract
The utility model provides an ultra-wide-range high-precision long-life venturi flow measurement device, which belongs to the technical field of flow measurement devices and comprises a detection pipeline and a differential pressure transmitter, wherein the detection pipeline comprises an upstream pipeline, a venturi pipeline and a downstream pipeline, the venturi pipeline comprises a constriction part, a throat part and an expansion part which are sequentially arranged, the constriction part is gradually contracted to the throat part from the upstream pipeline, the expansion part is gradually expanded to the downstream pipeline from the throat part, the throat part is provided with at least three first pressure taking openings, the upstream pipeline is provided with a second pressure taking opening corresponding to the first pressure taking opening, and the corresponding first pressure taking opening and second pressure taking opening are connected to the same differential pressure transmitter. According to the utility model, the pressure taking ports are arranged at the throats of the upstream pipeline and the Venturi pipeline, so that the vortex area is adapted, the range is widened, the full-range real-flow calibration is carried out section by section, the pressure taking ports at different positions are adopted for determining different flow ranges, and the high-precision measurement performance is realized.
Description
Technical Field
The utility model relates to the technical field of flow measuring devices, in particular to an ultra-wide-range high-precision long-life Venturi flow measuring device.
Background
In the field of hydrodynamics and flow measurement, a venturi is a widely used flow measurement device, where a fluid flows through the venturi, and the flow stream forms a local constriction at the throat of the venturi, thereby increasing the flow rate and decreasing the static pressure, thus creating a static pressure differential between the upstream side of the venturi and the throat. Based on the differential pressure and the fluid characteristics, the fluid flow within the conduit can be measured. Although venturi tubes are widely used because of their simple structure, good stability, low energy consumption, etc., there is a significant limitation in that the range is narrow, conventionally it is generally considered that high measurement accuracy can be maintained in the range of 1:3 to 1:4 (minimum flow measurement: maximum flow measurement), due to the change in the vortex region as the fluid flows through the converging section of the venturi tube to the throat.
Specifically, in the converging section of the venturi, the fluid velocity increases and the pressure decreases, creating a vortex region as the fluid passes through the throat. In the conventional venturi flow measurement device, the pressure measurement point of the venturi tube is usually set at a fixed position, and the vortex region of the fluid in the throat portion changes with the change of the flow rate, which results in that the pressure measurement value cannot accurately reflect the dynamic state of the actual fluid in a wide flow range, thereby limiting the measuring range of the venturi flow measurement device.
Disclosure of utility model
The utility model aims to overcome the defects and shortcomings in the prior art and provide an ultra-wide-range high-precision long-life Venturi flow measurement device.
The ultra-wide range high-precision long-life venturi flow measuring device comprises a detection pipeline and a differential pressure transmitter, wherein the detection pipeline comprises an upstream pipeline, a venturi pipeline and a downstream pipeline, the venturi pipeline comprises a constriction part, a throat part and an expansion part which are sequentially arranged, the constriction part is gradually contracted to the throat part from the upstream pipeline, the expansion part is gradually expanded to the downstream pipeline from the throat part, the throat part is provided with at least three first pressure taking openings, the upstream pipeline is provided with a second pressure taking opening corresponding to the first pressure taking opening, and the corresponding first pressure taking opening and second pressure taking opening are connected to the same differential pressure transmitter.
The second pressure taking openings are one, and the second pressure taking openings are divided into sub pressure taking openings, the number of the sub pressure taking openings corresponds to that of the first pressure taking openings.
The second pressure taking openings are arranged in one-to-one correspondence with the first pressure taking openings, and the second pressure taking openings are positioned on the same cross section.
The first pressure taking ports are uniformly arranged along the axial direction of the throat part.
Each first pressure taking opening is positioned on the same cross section.
The number of the first pressure taking openings is three, and the first pressure taking openings are respectively positioned at a position which is 45 degrees away from the lowest point of the detection pipeline left, a position which is 30 degrees away from the right and a position which is 60 degrees away from the right.
The distance between the second pressure taking port and the maximum cross section of the constriction part is not more than one half of the inner diameter of the upstream pipeline.
And spraying or overlaying hard alloy at least at the joint of the contraction part and the throat part.
The length of the constriction is smaller than the length of the expansion.
The expansion part comprises a first expansion section and a second expansion section, the first expansion section and the second expansion section are sequentially arranged along the direction from the throat part to the downstream pipeline, and the taper of the inner wall of the first expansion section is smaller than that of the inner wall of the second expansion section.
The utility model has the beneficial effects that the pressure distribution in the vortex area which is changed along with the change of the fluid flow speed can be captured by arranging the pairs of pressure taking ports at the throats of the upstream pipeline and the Venturi pipeline, so that the vortex area is adapted, the range is widened, the full-range real-flow calibration is carried out section by section, the pressure taking ports at different positions are adopted for determining different flow ranges, and the high-precision measurement performance is realized.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are required in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that it is within the scope of the utility model to one skilled in the art to obtain other drawings from these drawings without inventive faculty.
FIG. 1 is a schematic diagram of a first embodiment;
FIG. 2 is a second schematic diagram of the first embodiment;
FIG. 3 is a schematic diagram of a first embodiment of a detection pipeline;
FIG. 4 is a second schematic diagram of the detection pipeline according to the first embodiment;
FIG. 5 is a cross-sectional view of a test tube in accordance with the first embodiment;
fig. 6 is a schematic diagram of a detection pipeline in the second embodiment.
Detailed Description
The utility model will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic representations which merely illustrate the basic structure of the utility model and therefore show only the structures which are relevant to the utility model.
In the description of the present application, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intermediate medium, or in communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
In the description of the present utility model, it should be noted that, in the embodiments of the present utility model, all the expressions "first" and "second" are used for distinguishing two entities with the same name and non-same parameters, and it is noted that the "first" and "second" are merely for convenience of description, and should not be construed as limiting the embodiments of the present utility model, and the following embodiments are not described in any way.
Embodiment one:
As shown in fig. 1 to 5, an ultra-wide range high-precision long-life venturi flow measurement device comprises a detection pipeline 1 and a differential pressure transmitter 2, wherein the differential pressure transmitter 2 adopts an intelligent differential pressure transmitter in the prior art, and a flow calculation formula can be set according to a calibration result.
The detection pipeline 1 comprises an upstream pipeline 3, a venturi pipeline 4 and a downstream pipeline 5, the venturi pipeline 4 comprises a constriction part 41, a throat part 42 and an expansion part 43 which are sequentially arranged, the constriction part 41 is gradually contracted to the throat part 42 from the upstream pipeline 3, the expansion part 43 is gradually expanded to the downstream pipeline 5 from the throat part 42, the throat part 42 is provided with at least three first pressure taking ports 6, the upstream pipeline 3 is provided with second pressure taking ports 7 corresponding to the first pressure taking ports 6, the corresponding arrangement can be that the second pressure taking ports 7 are one, and one second pressure taking port 7 is provided with sub pressure taking ports of which the number corresponds to the first pressure taking ports 6. Through adopting the structure of branch, reduced the opening to upstream pipeline 3, promoted the integrality of pipeline, reduced the risk that gets the pressure mouth and the upstream pipeline 3 hookup location leakage.
The second pressure taking openings 7 are arranged in one-to-one correspondence with the first pressure taking openings 6, and the second pressure taking openings 7 are positioned on the same cross section, and the cross section is the radial section of the pipeline. By this arrangement, measurement errors caused by maldistribution of pressure in the pipe when fluid is flowing in the pipe can be minimized.
The corresponding first pressure taking port 6 and the second pressure taking port 7 are connected to the same differential pressure transmitter 2. When the device is in use, each differential pressure transmitter 2 and the corresponding pressure taking port can be used for detecting the differential pressure under different flow rates respectively.
Through the structure, the plurality of pairs of pressure taking ports are arranged at the throats 42 of the upstream pipeline 3 and the Venturi pipeline 4, and the pressure distribution in the vortex area changed along with the change of the fluid flow velocity can be captured, so that the vortex area is adapted, the range is widened, the range can be generally widened to 1:20 or more, the full-range real-flow calibration is carried out section by section, the pressure taking ports at different positions are adopted for determining the different flow ranges, and the high-precision measurement performance is realized.
There are various arrangements for the first pressure taking port 6 on the throat 42:
For example, each of the first pressure taking openings 6 is uniformly arranged along the axial direction of the throat 42, and specifically, when the number of the first pressure taking openings 6 is three, the positions 1/4, 1/2 and 3/4 along the axial length direction of the throat 42 are respectively arranged, and each of the first pressure taking openings 6 is not located on the same cross section, which is generally suitable for the detection pipeline 1 with smaller specification.
For another example, each of the first pressure-taking ports 6 is located on the same cross section, which is a radial cross section of the throat 42, and by this arrangement, measurement synchronism can be ensured, simplifying data processing.
In this embodiment, as shown in fig. 4 and 5, the number of the first pressure taking ports 6 is three, and the first pressure taking ports are respectively located at a position of 45 ° left, a position of 30 ° right, and a position of 60 ° right with respect to the lowest point of the detection pipe 1, and the pressure taking ports C are located at a 1/4 length position of the throat 42, the pressure taking ports B are located at a 1/2 length position of the throat 42, and the pressure taking ports a are located at a 3/4 length position of the throat 42. The pressure taking port A, the pressure taking port B and the pressure taking port C are respectively corresponding to detection under three different flow states of high, medium and low. In addition, the number of the second pressure taking openings 7 is three, the three second pressure taking openings 7 are arranged in one-to-one correspondence with the three first pressure taking openings 6, the deflection angles are the same, but the three second pressure taking openings 7 are positioned in the same cross section. According to the structure, a preferable scheme with better detection precision is obtained for the practice of the inventor. Of course, it is not limited to this structure.
Further, the distance between the second pressure taking port 7 and the maximum cross section of the constriction 41 is not more than one half of the inner diameter of the upstream pipeline 3.
With this arrangement, the accuracy and reliability of the measurement is optimized.
Further, cemented carbide is sprayed or deposited at least at the junction of the constriction 41 and the throat 42, or cemented carbide may be sprayed or deposited at both the constriction 41 and the throat 42.
Through this setting, compare in ordinary material and easily wash away for a long time by the fluid, influence device life, after spraying or build-up welding carbide layer, grind the surface after processing then, can improve measurement accuracy, measurement stability to extension device life.
Further, the length of the constriction 41 is smaller than the length of the expansion 43, and the length of the expansion 43 is generally 1.2-1.5 times the length of the constriction 41.
With this arrangement, the constriction 41 is prevented from becoming too long, reducing the pressure loss, while the expansion 43 is long to allow the fluid to have sufficient length to recover pressure, and to reduce turbulence and flow separation due to flow velocity variation.
Embodiment two:
as shown in fig. 6, the venturi tube 4 is modified on the basis of the first embodiment, specifically, the expansion portion 43 includes a first expansion section 431 and a second expansion section 432, the first expansion section 431 and the second expansion section 432 are sequentially disposed along the direction from the throat 42 to the downstream tube 5, and the taper of the inner wall of the first expansion section 431 is smaller than the taper of the inner wall of the second expansion section 432.
By this arrangement, progressive pressure recovery is achieved, reducing the risk of flow separation due to abrupt speed changes, while optimizing the dynamic characteristics of the fluid, thereby reducing turbulence intensity and energy loss.
The foregoing disclosure is illustrative of the present utility model and is not to be construed as limiting the scope of the utility model, which is defined by the appended claims.
Claims (10)
1. The utility model provides an ultra wide range high accuracy long-life venturi flow measurement device, its characterized in that, including detecting pipeline (1) and differential pressure transmitter (2), detect pipeline (1) including upstream pipeline (3), venturi pipeline (4) and downstream pipeline (5), venturi pipeline (4) are including constriction part (41), throat (42) and expansion portion (43) that set gradually, constriction part (41) are contracted to throat (42) by upstream pipeline (3) gradually, expansion portion (43) are expanded to downstream pipeline (5) by throat (42) gradually, throat (42) are provided with at least three first pressure mouth (6) of getting, corresponding first pressure mouth (6) are provided with second pressure mouth (7) of getting on upstream pipeline (3), and corresponding first pressure mouth (6) and second pressure mouth (7) of getting are connected to same differential pressure transmitter (2).
2. The ultra-wide-range high-precision long-life venturi flow measurement device according to claim 1, wherein the number of the second pressure taking openings (7) is one, and the number of the sub pressure taking openings corresponding to the number of the first pressure taking openings (6) is divided by one second pressure taking opening (7).
3. The ultra-wide-range high-precision long-life venturi flow measurement device according to claim 1, wherein the second pressure taking openings (7) are arranged in one-to-one correspondence with the first pressure taking openings (6), and the second pressure taking openings (7) are positioned on the same cross section.
4. An ultra wide range high precision long life venturi flow meter according to claim 1, wherein each said first pressure tapping port (6) is uniformly disposed axially along the throat (42).
5. An ultra wide range high precision long life venturi flow meter according to claim 1, wherein each said first pressure tap (6) is located on the same cross section.
6. The ultra-wide range high-precision long-life venturi flow measurement device according to claim 4 or 5, wherein the number of the first pressure sampling ports (6) is three, and the first pressure sampling ports are respectively positioned at a position which is 45 degrees left and a position which is 30 degrees right and a position which is 60 degrees right relative to the lowest point of the detection pipeline (1).
7. The ultra-wide-range high-precision long-life venturi flow measurement device according to claim 1, wherein the distance between the second pressure taking port (7) and the maximum cross section of the constriction (41) is not more than one half of the inner diameter of the upstream pipeline (3).
8. An ultra wide range high precision long life venturi flow meter according to claim 1, wherein cemented carbide is sprayed or deposited at least at the junction of said constriction (41) and throat (42).
9. The ultra-wide-range high-precision long-life venturi flow-rate measuring device according to claim 1, wherein the length of said constriction (41) is smaller than the length of the expansion (43).
10. The ultra-wide-range high-precision long-life venturi flow measurement device according to claim 1, wherein the expansion part (43) comprises a first expansion section (431) and a second expansion section (432), the first expansion section (431) and the second expansion section (432) are sequentially arranged along the direction from the throat (42) to the downstream pipeline (5), and the taper of the inner wall of the first expansion section (431) is smaller than that of the inner wall of the second expansion section (432).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420908889.2U CN222104804U (en) | 2024-04-28 | 2024-04-28 | An ultra-wide range, high-precision, long-life Venturi flow measurement device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420908889.2U CN222104804U (en) | 2024-04-28 | 2024-04-28 | An ultra-wide range, high-precision, long-life Venturi flow measurement device |
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| CN222104804U true CN222104804U (en) | 2024-12-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202420908889.2U Active CN222104804U (en) | 2024-04-28 | 2024-04-28 | An ultra-wide range, high-precision, long-life Venturi flow measurement device |
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| CN (1) | CN222104804U (en) |
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