CN111735508A - Radiation type slot type orifice plate - Google Patents
Radiation type slot type orifice plate Download PDFInfo
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- CN111735508A CN111735508A CN202010678238.5A CN202010678238A CN111735508A CN 111735508 A CN111735508 A CN 111735508A CN 202010678238 A CN202010678238 A CN 202010678238A CN 111735508 A CN111735508 A CN 111735508A
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- 230000005855 radiation Effects 0.000 title claims abstract description 10
- 230000002093 peripheral effect Effects 0.000 claims abstract description 22
- 238000005259 measurement Methods 0.000 abstract description 12
- 238000013461 design Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 5
- 238000011144 upstream manufacturing Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000000386 athletic effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
- G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
- G01F1/40—Details of construction of the flow constriction devices
- G01F1/42—Orifices or nozzles
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention discloses a radiation type slot type orifice plate. The invention relates to a plate capable of being installed in a pipeline, wherein the plate is provided with a central through hole and a plurality of peripheral through holes, the peripheral through holes are distributed around the central through hole in a radial type relation, the central through hole is a circular hole or a regular polygon through hole, the peripheral through holes are groove-shaped through holes, the number of the peripheral through holes is 1-3 circles, the number of the peripheral through holes in the first circle is n, the number of the peripheral through holes in the second circle is 3n, the number of the peripheral through holes in the third layer is 5n, and the value range of n is 3-6. According to the invention, by controlling the layout of the groove-type holes or the circular holes, the area of the holes and the structural design of the holes, an optimal measurement effect can be achieved, the generation of eddy current is reduced, and the accuracy and the stability of measurement are improved.
Description
Technical Field
The invention belongs to the technical field of flow measurement, and particularly relates to a radiation type groove type orifice plate.
Background
In the industrial production process, process parameters such as temperature, pressure, flow and the like need to be measured, the flow signal measurement mode has many principles, and a flowmeter is usually arranged on a pipeline to measure the flow. The differential pressure type flowmeter has long history and wide application, and generally comprises a standard orifice plate, a venturi, a nozzle and the like, wherein a throttling element is arranged in a pipeline, a differential pressure signal is generated when fluid flows through the throttling element, and the flow rate of the fluid flowing through the pipeline is estimated through the differential pressure signal.
The differential pressure type flowmeter has a large share in the flow measurement market due to the maturity of the measurement principle and the wide application for many years, but the traditional differential pressure type flowmeter generally has the defects of high price, large volume, high pressure loss, long required straight pipe section and the like. The standard orifice plate flowmeter adopts a single-orifice throttling mode, although the standard orifice plate flowmeter is simple in structure, the problems of irregular vortex, vibration, noise and the like can be generated when fluid passes through the orifice plate throttling hole, and the accuracy and the stability of measurement are influenced. Meanwhile, the standard orifice plate is too sensitive to the upstream flow velocity distribution, the required upstream and downstream straight pipe sections are very long, the upstream and downstream pipeline cost is increased, or equipment such as a rectifier and a flow straightener needs to be additionally arranged, the standard orifice plate is not suitable for occasions with narrow field space and compact structure, and the generated pressure loss also greatly increases the operation cost. For the standard orifice plate, some have also proposed the technical schemes of porous orifice plate, slot type orifice plate, etc., but the design of aperture, aperture ratio, resistance coefficient, etc. has not reached the optimal scheme.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a radiation type slot type orifice plate.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention relates to a plate capable of being installed in a pipeline, wherein the plate is provided with a central through hole and a plurality of peripheral through holes, the peripheral through holes are distributed around the central through hole in a radial type relation, the central through hole is a circular hole or a regular polygon through hole, the peripheral through holes are groove-shaped through holes, the number of the peripheral through holes is 1-3 circles, the number of the peripheral through holes in the first circle is n, the number of the peripheral through holes in the second circle is 3n, the number of the peripheral through holes in the third layer is 5n, and the value range of n is 3-6.
Further, the surrounding vias in each turn are the same size.
Further, if the length of the rectangle in the groove-shaped through hole is l, the width of the rectangle is m, the radius of the semicircle in the groove-shaped through hole is r2, and the equivalent radius of the central through hole is r1, r1=2 × r2, and l = 0-8 m.
Further, assuming that the center-to-center distance of the through holes of the first layer is R1, the center-to-center distance of the through holes of the second layer is R2, the center-to-center distance of the through holes of the third layer is R3, and the radius of the pipe is R, the following relationships are satisfied:
if there is only one layer of vias, R1= R/2;
if two layers of through holes exist, R1= R/3, R2= 2R/3;
if three layers of through holes exist, R1= R/4, R2= R/2, and R3= 3R/4.
Furthermore, the through hole is a straight through hole, and an arc chamfer, an oblique chamfer or a semicircular chamfer can be arranged on the straight through hole.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, by controlling the layout of the groove-type holes or the round holes and the structural design of the holes, an optimal measurement effect can be achieved, the generation of eddy current is reduced, and the accuracy and the stability of measurement are improved. Meanwhile, the flow field can be adjusted, the flow pattern distribution is improved, the flow velocity distribution is uniform, and the purposes of reducing the lengths of the upstream and downstream straight pipe sections and reducing the investment of field pipelines are achieved. In addition, the present invention can reduce noise by reducing the generation of eddy current.
Drawings
Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention.
Fig. 2 is a side perspective view of fig. 1.
Fig. 3 is a schematic structural diagram of embodiment 2 of the present invention.
Fig. 4 is a schematic structural diagram of embodiment 3 of the present invention.
Fig. 5 is a schematic diagram of a chamfer structure of a through hole.
Fig. 6 is a diagram of the rectification effect of the present invention.
FIG. 7 is a velocity cloud of the present invention.
FIG. 8 is a velocity cloud for a prior art orifice plate.
FIG. 9 is a graph comparing the outflow coefficients of three examples with a conventional orifice plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 and 2, the present invention includes a plate, which can be installed in a pipe to be tested, and has a plurality of through holes, including a central through hole, and the peripheral through holes are arranged in a radial relationship with the central through hole.
The central through hole is generally a circular hole, and the optional central through hole can be a regular polygonal through hole.
The peripheral through holes are groove-shaped through holes, namely, two ends of a rectangle are provided with semicircles to form the shape of an athletic field, and on the basis, when the radius of the semicircle is 0, the semicircle is deformed into the rectangle, as shown in figure 3; when the length of the rectangle becomes 0, it becomes a circular through hole, see fig. 4.
The number of the peripheral through holes is 1-3, the number of the through holes in the first layer is n, the number of the through holes in the second layer is 3n, the number of the through holes in the third layer is 5n, and the size of each circle of through holes is the same.
In the invention, if the radius of the central hole is r1, the width of the peripheral groove-shaped through hole is m, the length of the groove-shaped through hole is l, and the radius of the peripheral circular through hole is r2, the following design relations are satisfied:
r1= m =2r 2, L is 0-8 times of m, it is easy to know that the peripheral groove-shaped through hole is a round through hole when L =0, the relation between L and m is determined by the flow velocity of the on-site pipeline and the flow field condition, the longer the length of L is, the higher the sensitivity degree to the low flow velocity is, so that the larger the multiple of L and m is selected under the condition of the low flow velocity, the closer the round hole is, the higher the performance of measuring the high flow velocity is, and the better the flow velocity measured by using the round hole can even approach the sonic velocity.
In the invention, the center distance of the through holes of the first layer is R1, the center distance of the through holes of the second layer is R2, the center distance of the through holes of the third layer is R3, and the radius of the pipeline is R, the following design relations exist:
if there is only one layer of vias, R1= R/2;
if two layers of through holes exist, R1= R/3, R2= 2R/3;
if three layers of through holes exist, R1= R/4, R2= R/2, R3= 3R/4;
the layout ensures that the centers of the circular holes are distributed on the equal division points, on one hand, the impact resistance of the plate is improved due to uniform stress, on the other hand, the flow field is adjusted to reduce eddy current, the permanent pressure loss is reduced, the flow field is stable, and the stability and the accuracy of measurement are improved.
In the invention, the structure of the central through hole and the peripheral through holes is generally a straight through hole, optionally, the holes can be provided with arc chamfers, optionally, the holes can be provided with oblique chamfers, optionally, the holes can be semicircular chamfers, and see fig. 6.
To verify the specific effectiveness of the design of the present invention, fig. 6, 7, 8 and 9 are presented, and the asymmetric flow in the pipe as shown in fig. 6 can be changed into a fully developed symmetric flow by the rectification of the present invention. The length of the front and rear straight pipe sections can be greatly reduced. As shown in fig. 7 and 8, comparing the velocity clouds of the two flowmeters reveals that a large number of vortices are generated downstream of the orifice plate in the prior art, resulting in a large pressure loss and measurement uncertainty; in the groove type speed cloud chart, the eddy current is reduced after rectification, the permanent pressure loss is reduced, the flow field is stable, and the stability and the accuracy of measurement are improved. As shown in fig. 9, the outflow coefficients of the three designs of the present embodiment are larger than that of the orifice plate, the outflow coefficient of the circular slot is the largest, the linearity of the rectangular slot and the slot is better under the condition of small reynolds number, and the linearity of the outflow coefficient of the circular slot is better under the condition of large reynolds number.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (5)
1. The radiation type slot type orifice plate is a plate which can be installed in a pipeline, and the plate is provided with a central through hole and a plurality of peripheral through holes, and is characterized in that:
the through holes around are distributed in a radial relation around the central through hole, the central through hole is a round hole or a regular polygon through hole, the through holes around are groove-shaped through holes, the number of the through holes around is 1-3 circles, the number of the through holes around the first circle is n, the number of the through holes around the second circle is 3n, the number of the through holes around the third layer is 5n, and the value range of n is 3-6.
2. The radiation slot-type aperture plate of claim 1, wherein: the surrounding vias in each turn are the same size.
3. The radiation slot-type aperture plate of claim 1, wherein: and if the length of the rectangle in the groove-shaped through hole is l, the width of the rectangle is m, the radius of the semicircle in the groove-shaped through hole is r2, and the equivalent radius of the central through hole is r1, then r1=2 × r2, and l = 0-8 m.
4. The radiation trough aperture plate of any one of claims 1 to 3, wherein: assuming that the center distance of the through holes of the first layer is R1, the center distance of the through holes of the second layer is R2, the center distance of the through holes of the third layer is R3, and the radius of the pipeline is R, the following relations are satisfied:
if there is only one layer of vias, R1= R/2;
if two layers of through holes exist, R1= R/3, R2= 2R/3;
if three layers of through holes exist, R1= R/4, R2= R/2, and R3= 3R/4.
5. The radiation trough aperture plate of any one of claims 1 to 3, wherein: the through hole is a straight through hole, and an arc chamfer, an oblique chamfer or a semicircular chamfer can be arranged on the straight through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010678238.5A CN111735508A (en) | 2020-07-15 | 2020-07-15 | Radiation type slot type orifice plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010678238.5A CN111735508A (en) | 2020-07-15 | 2020-07-15 | Radiation type slot type orifice plate |
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| CN111735508A true CN111735508A (en) | 2020-10-02 |
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| CN202010678238.5A Pending CN111735508A (en) | 2020-07-15 | 2020-07-15 | Radiation type slot type orifice plate |
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Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5295397A (en) * | 1991-07-15 | 1994-03-22 | The Texas A & M University System | Slotted orifice flowmeter |
| US5341848A (en) * | 1989-07-20 | 1994-08-30 | Salford University Business Services Limited | Flow conditioner |
| CN2935097Y (en) * | 2006-07-18 | 2007-08-15 | 中国石油天然气集团公司 | Slotted orifice plate for multiphase metering device |
| CN201104248Y (en) * | 2007-06-01 | 2008-08-20 | 上海科洋科技发展有限公司 | Aperture plate |
| CN101413626A (en) * | 2007-10-15 | 2009-04-22 | 上海科洋科技发展有限公司 | Balance hole plate |
| US7621670B1 (en) * | 2009-02-25 | 2009-11-24 | The United States of America as represented by the National Aeronautica and Space Administration | Unbalanced-flow, fluid-mixing plug with metering capabilities |
| CN201527286U (en) * | 2009-11-23 | 2010-07-14 | 天津市润泰自动化仪表有限公司 | Porous rectifier type throttling component |
| JP2015165202A (en) * | 2014-03-03 | 2015-09-17 | 株式会社オーバル | Perforated plate for flow straightener, flow straightener and flow rate measurement device |
| CN107429871A (en) * | 2015-04-01 | 2017-12-01 | 恩德斯+豪斯流量技术股份有限公司 | Flow regulator |
| CN207717158U (en) * | 2017-12-29 | 2018-08-10 | 石家庄高新区中正仪器仪表有限公司 | The orifice-plate flowmeter that two-way can be used |
| CN110715700A (en) * | 2019-11-21 | 2020-01-21 | 西南石油大学 | Novel flow adjuster and metering device integration device |
| CN111022813A (en) * | 2019-12-03 | 2020-04-17 | 四川大学 | Porous current-limiting noise-reducing pore plate and current-limiting noise reducer formed by same |
| CN212363311U (en) * | 2020-07-15 | 2021-01-15 | 艾加流体控制(上海)有限公司 | Radiation type slot type orifice plate |
-
2020
- 2020-07-15 CN CN202010678238.5A patent/CN111735508A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5341848A (en) * | 1989-07-20 | 1994-08-30 | Salford University Business Services Limited | Flow conditioner |
| US5295397A (en) * | 1991-07-15 | 1994-03-22 | The Texas A & M University System | Slotted orifice flowmeter |
| CN2935097Y (en) * | 2006-07-18 | 2007-08-15 | 中国石油天然气集团公司 | Slotted orifice plate for multiphase metering device |
| CN201104248Y (en) * | 2007-06-01 | 2008-08-20 | 上海科洋科技发展有限公司 | Aperture plate |
| CN101413626A (en) * | 2007-10-15 | 2009-04-22 | 上海科洋科技发展有限公司 | Balance hole plate |
| US7621670B1 (en) * | 2009-02-25 | 2009-11-24 | The United States of America as represented by the National Aeronautica and Space Administration | Unbalanced-flow, fluid-mixing plug with metering capabilities |
| CN201527286U (en) * | 2009-11-23 | 2010-07-14 | 天津市润泰自动化仪表有限公司 | Porous rectifier type throttling component |
| JP2015165202A (en) * | 2014-03-03 | 2015-09-17 | 株式会社オーバル | Perforated plate for flow straightener, flow straightener and flow rate measurement device |
| CN107429871A (en) * | 2015-04-01 | 2017-12-01 | 恩德斯+豪斯流量技术股份有限公司 | Flow regulator |
| CN207717158U (en) * | 2017-12-29 | 2018-08-10 | 石家庄高新区中正仪器仪表有限公司 | The orifice-plate flowmeter that two-way can be used |
| CN110715700A (en) * | 2019-11-21 | 2020-01-21 | 西南石油大学 | Novel flow adjuster and metering device integration device |
| CN111022813A (en) * | 2019-12-03 | 2020-04-17 | 四川大学 | Porous current-limiting noise-reducing pore plate and current-limiting noise reducer formed by same |
| CN212363311U (en) * | 2020-07-15 | 2021-01-15 | 艾加流体控制(上海)有限公司 | Radiation type slot type orifice plate |
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