CN117090836A - Flow regulating assembly for complex pipeline - Google Patents
Flow regulating assembly for complex pipeline Download PDFInfo
- Publication number
- CN117090836A CN117090836A CN202310871340.0A CN202310871340A CN117090836A CN 117090836 A CN117090836 A CN 117090836A CN 202310871340 A CN202310871340 A CN 202310871340A CN 117090836 A CN117090836 A CN 117090836A
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- Prior art keywords
- cyclone
- rectifier
- pipe
- straight pipe
- flow
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- 230000001105 regulatory effect Effects 0.000 title claims abstract description 12
- 239000012530 fluid Substances 0.000 claims abstract description 42
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 14
- 230000003750 conditioning effect Effects 0.000 claims 7
- 238000005259 measurement Methods 0.000 abstract description 9
- 230000003068 static effect Effects 0.000 description 11
- 238000004364 calculation method Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/18—Supports or connecting means for meters
- G01F15/185—Connecting means, e.g. bypass conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15C—FLUID-CIRCUIT ELEMENTS PREDOMINANTLY USED FOR COMPUTING OR CONTROL PURPOSES
- F15C3/00—Circuit elements having moving parts
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cyclones (AREA)
Abstract
The invention discloses a flow regulating assembly for a complex pipeline, which comprises an elbow pipe connected to the upstream of a circular straight pipe and a branch pipe positioned at the upstream of the elbow pipe, wherein the flow regulating assembly comprises a cyclone and a rectifier, the cyclone and the rectifier are arranged in the circular pipe, fluid flows into the circular pipe after passing through the elbow, and the fluid in the circular pipe flows through the rectifier after passing through the cyclone to generate cyclone to finish rectification; the cyclone is provided with a plurality of cyclone separators. The invention can realize rapid rectification in the upstream straight pipe section with the complex pipeline, thereby improving the measurement accuracy of the flowmeter under the condition of insufficient length of the straight pipe section. The invention has the advantages of few parts, simple matching relationship and easy realization.
Description
Technical Field
The present invention relates to the field of fluid delivery technology, and more particularly, to a flow regulating assembly for complex piping.
Background
When the flow measurement is carried out on the fluid conveying pipeline, the fluid passing through the flowmeter is required to keep flowing stable as much as possible, if other measures are not taken, the fluid usually needs a longer straight pipe section to carry out steady flow, but the following situations can occur under the influence of actual conditions: 1. the length of the straight pipe section is insufficient; 2. the upstream of the straight pipe section is in a complex pipeline form with a plurality of elbows or converging branches; 3. the fluid velocity distribution is uneven across the cross-section. The above-mentioned circumstances often happen at the same time, fluid can lead to the intraductal fluid to produce the vortex when the fluid passes through the elbow or from the branch road to gather through the tee bend, the production of vortex can lead to the speed distribution of pipeline cross-section not enough especially to appear great deviation along the speed distribution of pipeline circumference, must lead to the measurement accuracy of flowmeter to receive the influence when the straight tube section of insufficient length again. In ISO5167, various flow regulators are recommended, but these flow regulators have a better effect on straight pipe sections, but for the case of complex pipes upstream and short straight pipe sections, the rectifying effect cannot meet the measurement requirements of the flowmeter.
Disclosure of Invention
In the prior art, vortex flow is generated in complex pipelines of multiple elbows, multiple branches and short straight pipes, the generation of the vortex flow can lead to uneven speed distribution of the section of the pipeline, particularly larger deviation appears in the speed distribution along the circumferential direction of the pipeline, and the measurement precision of the flowmeter is influenced.
The technical scheme of the invention is as follows: the flow regulating assembly comprises a cyclone and a rectifier, wherein the cyclone and the rectifier are arranged inside the circular straight pipe, fluid flows into the circular straight pipe after passing through the elbow, and the fluid flows through the rectifier to finish rectification after passing through the cyclone in the circular straight pipe; the cyclone is provided with a plurality of cyclone separators. The flow velocity distribution of the fluid on the pipeline section is uneven when the fluid flows in the upstream complex pipeline, so that the unit flow flowing through the pipeline section is not the same, the upstream fluid is fully rotated by the rotational flow of the cyclone, the velocity of the fluid on the pipeline section is kept the same in the circumferential direction, the velocity direction of the fluid is changed into the axial direction along the pipeline by the rectification of the rectifier, the fluid with any radius on the pipeline section after the rectifier has similar axial velocity, and the static pressure measured at the circumferential measuring point position of the flowmeter by the downstream flowmeter is basically consistent, so that the accuracy of the flowmeter measurement is ensured.
Preferably, the diameter of the circular straight pipe is D, and the extension length of the cyclone separator along the axial direction of the circular straight pipe is 0.3D-1D. The given rotational flow baffle has a shorter axial dimension, and can meet the purpose of realizing rapid speed adjustment of the fluid velocity in a shorter pipeline.
Preferably, the included angle between the rotational flow baffle plate and the axis of the circular straight pipe is 45-55 degrees. Within this angular range, it is already possible to achieve a sufficient rotational mixing of the fluid at most speeds.
Preferably, the distance between the cyclone and the outlet end of the bent pipe is smaller than 0.5D. In order to meet the requirement that rapid adjustment can be achieved in the shorter pipeline, the closer the cyclone is arranged at the outlet position of the elbow, the better.
Preferably, the axial distance between the cyclone and the rectifier is 2D-2.5D. The fluid is mixed again in the pipeline after flowing out of the cyclone in the length of 2D-2.5D, so that the fluid speed under each radius in the section of the pipeline is kept basically consistent.
Preferably, the rectifier is a tube bundle rectifier or a grid rectifier. The tube bundle rectifier or the grid rectifier divides the flow area in the pipeline into small flow areas with the same area, and can rapidly disperse the fully-rotationally mixed fluid into small strands for rectification, so that the rectification efficiency is improved, and the uniform separation of the cross sections of the pipeline can not cause the re-confusion of the speed distribution in the circumferential direction.
Preferably, the extending length of the rectifier along the axial direction of the circular straight pipe is 1.5D-2D. The rectifier needs a certain length to realize rectification, so that the fluid can ensure axial flow as much as possible, and the rectifier in the range can rectify the fluid, so that a longer rectifier is not needed. The rectifier achieves the purpose of mixing and rectifying the fluid in a short pipeline length, and provides a good measuring environment for downstream flowmeter measurement.
Preferably, the cyclone is provided with a central sleeve, and the cyclone separator is fixedly connected with the central sleeve and circumferentially and uniformly distributed on the outer surface of the central sleeve. After the central sleeve is arranged, the cyclone can be uniformly arranged in the pipeline, and the central sleeve can rectify the central fluid of the pipeline.
Alternatively, the cyclone is provided with a central ring, the front edge and the rear edge of the cyclone separator are respectively provided with a mounting groove, the central ring is embedded in the mounting grooves and fixedly connected with the cyclone separator, and the cyclone separator is uniformly distributed circumferentially relative to the central ring. The center ring plays a role in fixing the cyclone separator, so that the cyclone separator is convenient to weld and install in the pipeline.
Preferably, the cross section of the cyclone separator is in a straight plate shape or a streamline shape.
The beneficial effects of the invention are as follows:
and the measuring precision of the flowmeter is improved. The invention can realize rapid rectification in the upstream straight pipe section with the complex pipeline, thereby improving the measurement accuracy of the flowmeter under the condition of insufficient length of the straight pipe section.
The structure is simple. The invention has the advantages of few parts, simple matching relationship and easy realization.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a side view of the present invention;
FIG. 3 is a top view of the present invention;
FIG. 4 is a schematic view of a cyclone according to the present invention;
FIG. 5 is a schematic view of another embodiment of the cyclone of the present invention;
FIG. 6 is a schematic diagram of a cross-sectional fluid velocity profile of a measured conduit after an elbow in the present invention before addition of a cyclone, rectifier;
FIG. 7 is a schematic diagram showing the measured cross-sectional fluid velocity profile of the pipe after the addition of a cyclone, rectifier, and elbow in accordance with the present invention;
FIG. 8 is a graph of measured static pressure difference at points before and after the orifice plate of the flowmeter before the swirler is added and before the rectifier;
FIG. 9 is a graph showing measured static pressure differences at points before and after the addition of a cyclone and a rectifier to a flow meter orifice plate according to the present invention;
FIG. 10 is a flow chart of CFD calculation in a front tube of a mounted cyclone and rectifier;
FIG. 11 is a flow chart of CFD calculation in the post-installation cyclone, rectifier tube.
In the figure, 1-elbow, 2-round straight pipe, 3-cyclone, 4-rectifier, 5-cyclone baffle, 6-center ring, 7-flowmeter orifice plate, 8-first branch, 9-second branch, 10-center sleeve.
Detailed Description
The invention will be further described with reference to specific embodiments in the drawings.
Example 1:
as shown in fig. 1 to 11, a flow regulating assembly for a complex pipeline including a bent pipe 1 connected upstream of a circular straight pipe 2 and a branch pipe located upstream of the bent pipe, the circular straight pipe 2 having an inner diameter d=388 mm. The flow regulating assembly comprises a cyclone 3 and a rectifier 4, wherein the cyclone 3 and the rectifier 4 are arranged inside a circular straight pipe 2, fluid flows into the circular straight pipe 2 after passing through an elbow 1, and the fluid in the circular straight pipe 2 flows through the rectifier 4 after generating cyclone through the cyclone 3 to finish rectification. The cyclone 3 comprises two center rings 6 and eight cyclone separators 5 which are uniformly arranged in the circumferential direction, the two center rings 6 are respectively embedded into mounting grooves at the front edge and the rear edge of the cyclone separators 5, and the center rings 6 combine all the cyclone separators 5 into a whole which is uniformly distributed in the circumferential direction, so that the cyclone separators 5 can conveniently extend into the circular straight pipes 2 to be welded and positioned. The cross section of the cyclone separator 5 is in a straight plate shape or a streamline shape. The axial extension length of the cyclone separator 5 along the circular straight pipe 2 is 1D, the radial depth of the cyclone separator 5 is 0.25D, and the included angle between the cyclone separator 5 and the axis of the circular straight pipe 2 is 48 degrees. The distance of the cyclone 3 from the outlet end of the elbow 1 is 0.2D. The rectifier 4 is a tube bundle rectifier, the distance between the inlet of the rectifier 4 and the outlet of the cyclone 3 is 2D, and the axial extension length of the rectifier 4 along the circular straight tube 2 is 1.5D.
The flow meter is arranged at the downstream of the rectifier 4 in the circular straight pipe 2, the flow measurement principle is that the static pressure difference before and after the flow meter orifice plate 7 is measured, and then the static pressure difference is calculated according to a theoretical formula, and the theoretical formula is as follows:
in the formula, parameters such as the outflow coefficient C, the expansion coefficient epsilon and the like are calibrated by manufacturers to obtain accurate values, so that the accuracy of the measured flow can be evaluated by measuring the front-rear pressure difference delta p, wherein delta p is obtained by taking the average value of static pressures measured by three or six measuring points circumferentially arranged on the front and rear sides of a flowmeter orifice plate and then making a difference value, and if the difference of the static pressure measured values between the measuring points is large, the average value in the later calculation is inaccurate, thereby influencing the result of delta p.
The flow meter is 8D from the outlet of the elbow 1 upstream and the fluid medium is air. The two branches are respectively a first branch 8 and a second branch 9, the first branch 8 enters the elbow 1 from top to bottom in the vertical direction, the second branch 9 is inserted into the first branch 8 from the horizontal direction, the second branch 9 forms jet impact relative to the flow direction of the first branch 8, the velocity section of fluid before the flowmeter after passing through the elbow before the flow regulating assembly is not installed is shown in fig. 6, the fluid velocity on one side of the pipeline is obviously higher than that on the other side, the flow path line is calculated through the fluid CFD, the fluid in the pipeline after passing through the elbow 1 always spirally advances until the front 7 of the flowmeter orifice plate when the swirler 3 and the rectifier 4 are not installed, at this time, the static pressure deviation measured by each measuring point circumferentially arranged before the flowmeter orifice plate 7 is larger as shown in fig. 6, the flow error calculated through the formula is larger, if only an axial rectifying device is adopted, although the velocity of the fluid on the same section is actually different, the axial velocity of the fluid on one side of the pipeline is obviously higher than that on the other side, thus the static pressure difference between the measuring point on the front and the measuring point on the same side of the same part can still appear, and the static pressure difference is still larger before the measuring point on the other measuring point is obtained. The cyclone 3 and the rectifier 4 are arranged in the circular straight pipe 2 at the outlet of the elbow 1, the cyclone 3 is arranged at the upstream of the rectifier 4, so that fluid is fully stirred through the cyclone 3 after passing through the elbow 1 and then is rectified through the rectifier 4, the velocity screenshot before the fluid passes through the cyclone 3 and the rectifier 4 is shown in fig. 7, the flow line in the pipe is shown in fig. 11, and the circumferential uniformity of the velocity distribution is obviously improved compared with the prior velocity. The three-dimensional CFD calculation is used for respectively calculating the calculation examples without a cyclone and a rectifier and the calculation examples with the cyclone and the rectifier, and comparing the calculation examples with straight pipe reference calculation examples with the same flow rate, the calculation examples are found that: the static pressure difference of 6 monitoring points before and after the flow meter is arranged behind the cyclone and the rectifier is more similar to that of 6 monitoring points before and after the flow meter in the straight pipe reference calculation example, so that the measured flow through the flow meter is more accurate.
Example 2:
the cyclone 3 consists of a central sleeve 10 and eight cyclone separators 5 which are uniformly arranged in the circumferential direction, wherein the cyclone separators 5 are fixedly connected with the central sleeve 10 and are uniformly distributed on the outer surface of the central sleeve 10 in the circumferential direction. The length of the cyclone separator 5 along the axial direction of the circular straight pipe 2 is 0.5D. The included angle between the rotational flow baffle plate and the axis of the circular straight pipe is 45 degrees. The distance between the cyclone 3 and the outlet end of the elbow 1 is less than 0.3D. The axial distance between the swirler 3 and the rectifier 4 is 2.3D. The rectifier 4 is a grid rectifier, and the axial extension length of the rectifier 4 along the circular straight pipe 2 is 1.8D. The procedure is as in example 1.
Example 3:
the cross section of the cyclone separator 5 is streamline. The length of the cyclone separator 5 along the axial direction of the circular straight pipe 2 is 0.3D. The included angle between the rotational flow baffle plate 5 and the axis of the circular straight pipe 2 is 55 degrees. The distance of the cyclone 3 from the outlet end of the elbow 1 is 0.4D. The axial distance between the swirler 3 and the rectifier 4 is 2.5D. The length of the rectifier 4 extending along the axial direction of the straight tube 2 is 2D. The procedure is as in example 1.
Claims (10)
1. The flow regulating assembly for the complex pipeline comprises an elbow pipe connected to the upstream of the circular straight pipe and a branch pipe positioned on the upstream of the elbow pipe, and is characterized by comprising a cyclone and a rectifier, wherein the cyclone and the rectifier are arranged in the circular straight pipe, fluid flows into the circular straight pipe after passing through the elbow pipe, and the fluid in the circular straight pipe flows through the rectifier after generating cyclone in the cyclone to finish rectification;
the cyclone is provided with a plurality of cyclone separators.
2. The flow regulating assembly for complex piping according to claim 1, wherein the diameter of the circular straight pipe is D, and the length of extension of the swirl baffles in the axial direction of the circular straight pipe is 0.3D-1D.
3. The flow conditioning assembly for complex piping of claim 1, wherein the swirl baffles are angled in the range of 45-55 degrees from the axis of the circular straight tube.
4. The flow conditioning assembly for complex piping of claim 2, wherein the cyclone is less than 0.5D from the elbow outlet end.
5. The flow conditioning assembly for complex piping of claim 2, wherein the axial distance between the swirler and the rectifier is 2D-2.5D.
6. The flow conditioning assembly for complex piping of claim 2, wherein the rectifier is a tube bundle rectifier or a grid rectifier.
7. The flow conditioning assembly for complex piping of claim 2, wherein the rectifier has an extension length of 1.5D-2D along the axial direction of the straight tube.
8. The flow conditioning assembly for complex piping as claimed in any of claims 1 to 7, wherein a central sleeve is provided on said cyclone, said cyclone separator being fixedly connected to said central sleeve and circumferentially evenly distributed on the outer surface of said central sleeve.
9. The flow regulating assembly for complex piping according to any of claims 1 to 7, wherein a center ring is provided on said cyclone, the front and rear edges of said cyclone separator are respectively provided with a mounting groove, said center ring is embedded in said mounting groove and fixedly connected with said cyclone separator, and said cyclone separator is uniformly distributed circumferentially with respect to said center ring.
10. A flow conditioning assembly for complex piping as claimed in any of claims 1 to 7, wherein said swirl baffles are straight or streamlined in cross-section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310871340.0A CN117090836A (en) | 2023-07-14 | 2023-07-14 | Flow regulating assembly for complex pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310871340.0A CN117090836A (en) | 2023-07-14 | 2023-07-14 | Flow regulating assembly for complex pipeline |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117090836A true CN117090836A (en) | 2023-11-21 |
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ID=88776287
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310871340.0A Pending CN117090836A (en) | 2023-07-14 | 2023-07-14 | Flow regulating assembly for complex pipeline |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117090836A (en) |
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2023
- 2023-07-14 CN CN202310871340.0A patent/CN117090836A/en active Pending
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