CN103791953B - High-precision integrative core level Venturi tube - Google Patents
High-precision integrative core level Venturi tube Download PDFInfo
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- CN103791953B CN103791953B CN201310205081.4A CN201310205081A CN103791953B CN 103791953 B CN103791953 B CN 103791953B CN 201310205081 A CN201310205081 A CN 201310205081A CN 103791953 B CN103791953 B CN 103791953B
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Abstract
The invention discloses a kind of high-precision integrative core level Venturi tube, belong to field of fluid measurement.At least include：Upstream straight length, Venturi tube body, downstream straight length, grading ring, ozzle, each section of integrated forging of the Venturi tube body, thus being integrally formed Venturi tube body.By by the inlet cylinders section of Venturi tube body, circular cone contraction section, throat, circular cone diffuser is using integrated forging and is finished, eliminate impulse flexible pipe, simultaneously at the position easy to wear caused by impact, that is circular cone contraction section and throat's junction built-up welding hard wear-resistant material, so as to overcome prior art Venturi tube rolled using steel plate sectional and welded the welding deformation for existing, welding dislocation, Welding Safety hidden danger, postwelding do not process, each section of defect such as coaxially, caused by impact easy to wear and service life is not short；The reliability and stability for improve venturi tube structure intensity, each section of axiality and security performance, using.
Description
Technical field
The present invention relates to field of fluid measurement, more particularly to a kind of high-precision integrative core level Venturi tube.
Background technology
Venturi tube is a kind of measurement pipeline flow instrument, plays a part of to measure fluid flow.
Third generation advanced Nuclear Power technology main feed system to the certainty of measurement of flow measurement Venturi tube, security performance,
Service life requirement more and more higher, heavy caliber venturi apparatus of the overall length more than ten meters, uncertainty of measurement requirement be equal to or
Better than ± 0.25%, higher than 6 times of standard ± 1.5% precision of requirement, safe operating life requirement is reached 60 years.The nineties, I
State GNPS from the main feed system pipeline flow measurement Venturi tube of French import, because of its design structure and
, after a period of time of coming into operation, there are the phenomenons such as concussion, the deviation of throat's serious wear, measurement result in reasons, its
The requirement of safe service life and nuclear power station the visual plant service life of 40 to 60 years differs greatly.Therefore, manufacture and design a set of
Meet third generation nuclear power station technical requirements and safety requirements, the Venturi tube of specifying measurement precision and service life can be reached
It is the task of top priority of China's nuclear power industry.
The main feed system be used for control Turbine Safety to run, be characterized in heavy caliber, high temperature, high pressure, high flow rate,
Operation free of discontinuities, the long-term safety performance of the Venturi tube used the system, stability in use, certainty of measurement have very high
It is required that.Thus to its accuracy of manufacture, all proposed including physical dimension error, axiality, inside surface roughness, wear-resistant degree etc.
Requirement very high.Therefore, main feedwater Venturi tube so high accuracy, large scale, requirement of long life, design requirement ten
Divide harshness, difficulty of processing is very big, the state of puzzlement always for a long time inner venturi tube manufacturing.
Traditional Venturi tube is as shown in figure 1, mainly include that inlet cylinders section 1, circular cone contraction section 2, throat 3, circular cone expand
Section 4 is dissipated, when Venturi tube nominal diameter is more than 200mm, is generally connected by the way of steel plate rolls welding between each section, institute
State circular cone contraction section 2 and circular cone diffuser 4 to be formed by steel plate is coiling welded, cylindrical section pressure port 1.1 offered in inlet cylinders section 1,
Throat's pressure port 3.1 is offered in throat 3, for pressure.This structure there may be welding deformation, welding dislocation, Welding Safety
Hidden danger, postwelding are not processed, each section of not coaxial, defect such as dimensional discrepancy is larger, certainty of measurement is not high, security reliability is poor, typically
For pressure to be low, normal temperature and the less demanding fluid measurement of certainty of measurement, such as standard GB/T2624 requires the structure Venturi tube
Uncertainty of measurement is equal to 1.5%.
The Venturi tube that existing nuclear power plant uses its structure is substantially with reference to external design, as shown in Fig. 2 mainly including
Outer tube 5, Venturi tube main body 6, the Venturi tube main body 6 it is main by inner tube circular cone contraction section 6.1, inner tube throat 6.2, it is interior
Pipe throat pressure port 6.2.1, inner tube circular cone diffuser 6.3 are constituted, and upstream end pressure port 5.1 is offered on outer tube 5, including
Pipe throat 6.2 offers inner tube throat pressure port 6.2.1, by upstream grading ring 7, throat's grading ring 8, upstream impulse ozzle 9,
Throat stainless steel impulse flexible pipe 10 and the impulse of throat impulse ozzle 11.This structure is due to inner tube circular cone contraction section 6.1, inner tube circular cone
Diffuser 6.3 is rolled and welded using steel plate, and inner surface is not processed, and can also be existed and be deformed caused by welding, because of inner surface
Do not process and cause scale error larger, and because pressure is also easy to produce interior leakage using flexible pipe.Inner tube throat 6.2 and inner tube circular cone are received simultaneously
Abrasion is caused in the junction of contracting section 6.1 by fluid impact for a long time, and not high so as to there is certainty of measurement, service life is not long, safety
The defects such as poor reliability.In sum, divide after traditional and prior art Venturi tube is rolled due to each section using steel plate
Section welding, and corresponding measure is not taken at position easy to wear, thus so harsh design requirement cannot have been met.
The content of the invention
In order to solve problem of the prior art, a kind of high-precision integrative core level venturi is the embodiment of the invention provides
Pipe.Bulk strength is high, and each section of axiality is high, and machining accuracy is high, and certainty of measurement is high, wear-resistant, long service life, security performance
It is good.The technical scheme is as follows：
A kind of high-precision integrative core level Venturi tube, at least includes：Upstream straight length, Venturi tube body, downstream are straight
Pipeline section, grading ring, ozzle, each section of integrated forging of the Venturi tube body, thus being integrally formed Venturi tube body.
Specifically, the integrated Venturi tube body upstream end and the second positioning W.N flange welding, downstream and institute
State downstream straight length welding；Described upstream straight length one end and the first positioning W.N flange welding.
Specifically, the first positioning W.N flange is provided with convex-concave and determines with the opposite face of the described second positioning W.N flange
Plane, gasket seal is provided between two flanges, is positioned the described first positioning W.N flange and described second by fastener
W.N flange is connected.
Specifically, the integrated Venturi tube body at least includes：Inlet cylinders section, circular cone contraction section, Venturi tube
Throat, circular cone diffuser, the circular cone contraction section and built-up welding hard, wear-resistant material in the venturi throat excessively groove at place
Material.
Specifically, the integrated Venturi tube body exterior is provided with Venturi tube grading ring, and the Venturi tube is equal
Ozzle is provided with pressure ring.
Specifically, the Venturi tube grading ring at least includes：Cylindrical section grading ring, throat's grading ring；The ozzle is extremely
Include less：Cylindrical section exhaust nozzle, cylindrical section blowdown ozzle, cylindrical section impulse ozzle, throat's exhaust nozzle, throat's blow-off pipe
Mouth, throat's impulse ozzle.
Further, the upper position of the cylindrical section grading ring is provided with the cylindrical section exhaust nozzle, and lower orientation is set
There are the cylindrical section blowdown ozzle and the cylindrical section impulse ozzle.
Further, the upper position of throat's grading ring is provided with throat's exhaust nozzle, and lower orientation is provided with institute
State throat's blowdown ozzle and throat's impulse ozzle.
Further, at least provided with four through holes on the inlet cylinders section tube wall of the integrated Venturi tube body,
Communicated with the cylindrical section grading ring, and communicated with the ozzle on the cylindrical section grading ring.
Further, it is logical at least provided with four on the venturi throat tube wall of the integrated Venturi tube body
Hole, communicates with throat's grading ring, and is communicated with the ozzle on throat's grading ring.
The beneficial effect that technical scheme provided in an embodiment of the present invention is brought is：
The embodiment of the present invention optimizes prior art Venturi tube general structure, by by the inlet cylinders of Venturi tube
Section, circular cone contraction section, throat, circular cone diffuser are eliminated Venturi tube steel plate and are rolled and welded using integrated forging process
Operation, eliminates impulse flexible pipe, and position easy to wear is that circular cone contraction section and throat junction process groove and built-up welding hard
High-abrasive material, overcomes each section of prior art Venturi tube and uses the welding deformation for being segmented welding and existing, welding to misplace, welds and let out
The defect such as leak source, postwelding are not processed and each section is not coaxial；Improve venturi tube structure intensity, each section of axiality and security
Can, the reliability and stability for using make each section of axiality of Venturi tube of the overall length more than ten meters reach or better than 500 μm, text
Venturi section surface machining roughness reaches or better than Ra1.6, greatly improves the certainty of measurement of Venturi tube, makes measurement
Uncertainty is better than ± 0.25%.
Brief description of the drawings
Technical scheme in order to illustrate more clearly the embodiments of the present invention, will make to required described in embodiment below
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing.
Fig. 1 is traditional venturi tube structure schematic diagram；
Fig. 2 is the venturi tube structure schematic diagram that existing nuclear power plant uses；
Fig. 3 is high-precision integrative core level venturi tube structure schematic diagram provided in an embodiment of the present invention；
Fig. 4 is A-A sectional views in Fig. 3 provided in an embodiment of the present invention；
Fig. 5 is B-B sectional views in Fig. 3 provided in an embodiment of the present invention；
Fig. 6 is I portions schematic enlarged-scale view in Fig. 3 provided in an embodiment of the present invention.
Each symbol represents that implication is as follows in figure：
1 inlet cylinders section, 1.1 cylindrical section pressure ports；
2 circular cone contraction sections；
3 throats, 3.1 throat's pressure ports；
4 circular cone diffusers；
5 outer tubes, 5.1 upstream end pressure ports；
6 Venturi tube main bodys, 6.1 inner tube circular cone contraction sections, 6.2 inner tube throats, 6.2.1 inner tubes throat pressure port, in 6.3
Pipe circular cone diffuser；
7 upstream grading rings；
8 throat's grading rings；
9 upstream impulse ozzles；
10 throat's stainless steel impulse flexible pipes；
11 throat's impulse ozzles；
12 upstream straight lengths；
13 first positioning W.N flanges；
14 second positioning W.N flanges；
15 Venturi tube bodies,
15.1 inlet cylinders section, 15.1.1 through holes；
15.2 circular cone contraction sections, 15.2.1 hard wear-resistant materials；
15.3 venturi throats, 15.3.1 through holes；
15.4 circular cone diffusers；
16 downstream straight lengths；
17 gasket seals；
18 fasteners；
19 Venturi tube grading rings, 19a cylindrical section grading rings, 19b throats grading ring；
20 ozzles, 20a cylindrical section exhaust nozzles, 20b cylindrical section blowdown ozzles, 20c cylindrical section impulse ozzles, 20d throats
Exhaust nozzle, 20e throats blowdown ozzle, 20f throats impulse ozzle.
The direction of arrow is media flow direction in figure.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to embodiment party of the present invention
Formula is described in further detail.
It is shown in Figure 3, a kind of high-precision integrative core level Venturi tube is the embodiment of the invention provides, specifically, make
For preferred, at least include：The positioning positioning of W.N flange 13, second of upstream straight length 12, first W.N flange 14, Venturi tube sheet
The parts such as body 15, downstream straight length 16, gasket seal 17, fastener 18, Venturi tube grading ring 19, ozzle 20；The text
The upstream end of venturi body 15 is welded with the second positioning W.N flange 14, and downstream is welded with downstream straight length 16；The upstream
Welded with the first positioning W.N flange 13 one end of straight length 12；The first positioning W.N flange 13 and second positioning W.N flange
14 opposite face is provided with convex-concave locating surface, for being accurately positioned, gasket seal 17 is provided between two flanges, by fastener
18 are connected the first positioning W.N flange 13 with the second positioning W.N flange 14；Text is provided with outside the Venturi tube body 15
Ozzle 20 is provided with venturi grading ring 19, Venturi tube grading ring 19.
Referring also to shown in Fig. 4, Fig. 5, Fig. 6, specifically, preferably, the Venturi tube body 15 at least includes：Enter
Mouth cylindrical section 15.1, circular cone contraction section 15.2, venturi throat 15.3, circular cone diffuser 15.4, each section is forged using integration
Part is processed, thus being integrally formed Venturi tube body 15；The circular cone contraction section 15.2 and venturi throat 15.3
Excessively place's inner surface processes groove, and the built-up welding hard wear-resistant material 15.2.1 in groove.
Specifically, the Venturi tube grading ring 19 at least includes：Cylindrical section grading ring 19a, throat grading ring 19b；Institute
Stating pressure pipe mouth 20 at least includes：Cylindrical section exhaust nozzle 20a, cylindrical section blowdown ozzle 20b, cylindrical section impulse ozzle 20c, throat
Exhaust nozzle 20d, throat blowdown ozzle 20e, throat impulse ozzle 20f.
Further, the upper position of the cylindrical section grading ring 19a is provided with cylindrical section exhaust nozzle 20a, and lower orientation is set
There is cylindrical section blowdown ozzle 20b and at least two cylindrical section impulse ozzle 20c.
Further, the upper position of throat's grading ring 19b is provided with throat exhaust nozzle 20d, and lower orientation is provided with larynx
Portion's blowdown ozzle 20e and at least two throat impulse ozzle 20f.
Specifically, it is logical at least provided with four on inlet cylinders 15.1 tube walls of section of the integrated Venturi tube body 15
Hole 15.1.1, upper through-hole be used for be vented, lower through-hole be used for blowdown, and with the cylindrical section of cylindrical section grading ring 19a upper positions
Exhaust nozzle 20a, the cylindrical section blowdown ozzle 20b in lower orientation and with horizontal plane angle for 30-60 degree impulse ozzle 20c
Communicate.
Specifically, at least provided with four on the tube wall of venturi throat 15.3 of the integrated Venturi tube body 15
Through hole 15.3.1, upper through-hole is used to be vented, and lower through-hole is used for blowdown, and is arranged with the throat of throat grading ring 19b upper positions
Tracheae mouth 20d, the throat blowdown ozzle 20e in lower orientation and with horizontal plane angle for 30-60 degree impulse ozzle 20f phases
It is logical.
The preparation method of the embodiment of the present invention：
1）Finished inner surface after the positioning welding of W.N flange 13 of upstream straight length 12 and first, reaches the chi of engine request
Very little precision, circularity and surface roughness；
2）The first roughing inner surface of integrated Venturi tube body 15, in circular cone contraction section 15.2 and venturi throat
15.3 excessive places process groove, and the built-up welding hard wear-resistant material 15.2.1 in groove, then with the second positioning W.N flange
14 welding, after the completion of overall finished inner surface, reach the dimensional accuracy of engine request, circularity, surface roughness and each section same
Axle degree；
3）The end face of the first positioning positioning W.N flange 14 of W.N flange 13, second processes concave and convex surface respectively, and
Determine size by fit tolerance grade, reach the purpose of precise match；
4）Whether downstream straight length 16 determine length and wear according to requirement of engineering, and in postwelding finished inner surface.
Above processing method can ensure each section of dimensional accuracy, surface roughness, each section of axiality, it is ensured that Venturi tube
Certainty of measurement, make Venturi tube uncertainty of measurement reach or better than 0.25%, far above standard requirement.Due to integration
Each section of Venturi tube body 15 is using overall forging and circular cone contraction section 15.2 with the excessively place of venturi throat 15.3 using hard
The built-up welding treatment of matter high-abrasive material, greatly improves its security reliability and anti-wear performance, extends service life, it is ensured that
The high accuracy and stability of measurement.
In sum, the embodiment of the present invention is directed to traditional Venturi tube and the existing weldering with nuclear power plant's Venturi tube presence
Connect deformation, scale error is larger for manufacture, leakage in pressure flexible pipe, certainty of measurement be not high, the not high defect of security performance, for many years with
Come, inventor set about around nuclear power station main feed system pipeline flow measurement carried out with Venturi tube deep investigation, analysis,
Dimensioned precision and fit tolerance, each section of axiality of research, strict control Venturi tube body and upstream and downstream straight length, it is excellent
Venturi tube general structure is changed, in addition to foregoing beneficial effect, has also had the following advantages that：
1. upstream straight length uses positioning W.N flange Special tooling clamp with integrated Venturi tube body section, it is ensured that
The axiality of upstream straight length and integrated Venturi tube body, while dress when facilitating site technique pipeline section to overhaul and safeguard
Unload.
2. circular cone contraction section excessively locates built-up welding hard wear-resistant material with throat, and circular cone contraction section is literary mound with excessively place of throat
In tube body by fluid scouring most serious position, prior art do not do specially treated herein, and work can after a period of time
There is different degrees of abrasion, influence certainty of measurement, or even cause potential safety hazard；After through built-up welding hard wear-resistant material, improve
The hardness of material, increased rub proofness, improve measurement stability, extend service life.
3. cancel stainless steel flexible hose pressure, using directly drilling and grading ring pressure, it is to avoid interior leakage hidden danger, improve and take
Laminated structure.
4., with processed upstream straight length and downstream straight length is carried, more meet standard and upstream and downstream straight length is wanted
Ask.
5. overall inner surface is finished, particularly to circular cone contraction section, the circular cone of integrated Venturi tube body
The inner surface finishing of diffuser, so as to improve geometric accuracy, axiality, the conicity of integrated Venturi tube body
And inside surface roughness, so as to improve certainty of measurement.
6. easy for installation, leakage point is few, it is adaptable on nuclear power station main feed system, for measuring fluids within pipes
Flow.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all it is of the invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (3)
1. a kind of high-precision integrative core level Venturi tube, at least includes：Upstream straight length (12), Venturi tube body (15),
Downstream straight length (16), grading ring (19), ozzle (20), are provided with Venturi tube and press outside the Venturi tube body (15)
Ring (19), is provided with ozzle (20), it is characterised in that the Venturi tube grading ring on the Venturi tube grading ring (19)
(19) at least include：Cylindrical section grading ring (19a), throat's grading ring (19b)；
The ozzle (20) at least includes：Cylindrical section exhaust nozzle (20a), cylindrical section blowdown ozzle (20b), cylindrical section pressure guiding pipe
Mouth (20c), throat's exhaust nozzle (20d), throat's blowdown ozzle (20e), throat's impulse ozzle (20f)；
The upper position of the cylindrical section grading ring (19a) is provided with the cylindrical section exhaust nozzle (20a), and lower orientation is provided with institute
State cylindrical section blowdown ozzle (20b) and the cylindrical section impulse ozzle (20c)；
The upper position of throat's grading ring (19b) is provided with throat's exhaust nozzle (20d), and lower orientation is provided with the larynx
Portion's blowdown ozzle (20e) and throat's impulse ozzle (20f)；
The integrated Venturi tube body (15) at least includes：Inlet cylinders section (15.1), circular cone contraction section (15.2), literary mound
Li Guan throats (15.3), circular cone diffuser (15.4)；
At least provided with four through holes on inlet cylinders section (15.1) tube wall of the integrated Venturi tube body (15)
(15.1.1), and cylindrical section exhaust nozzle (20a), the cylindrical section in lower orientation with cylindrical section grading ring (19a) upper position
Blowdown ozzle (20b) and with horizontal plane angle for the impulse ozzle (20c) of 30-60 degree is communicated；
At least provided with four through holes on venturi throat (15.3) tube wall of the integrated Venturi tube body (15)
(15.3.1), and throat's exhaust nozzle (20d), throat's blow-off pipe in lower orientation with throat's grading ring (19b) upper position
Mouth (20e) and with horizontal plane angle for the impulse ozzle (20f) of 30-60 degree is communicated；
Integrated Venturi tube body (15) upstream end with second positioning W.N flange (14) welding, downstream with it is described under
Trip straight length (16) welding；Described upstream straight length (12) one end and the first positioning W.N flange (13) welding；
First positioning W.N flange (13) is provided with convex-concave and positions with the opposite face of the described second positioning W.N flange (14)
Face.
2. high-precision integrative core according to claim 1 level Venturi tube, it is characterised in that the integrated venturi
Each section of tube body (15) is simultaneously finished using integrated forging, the circular cone contraction section (15.2) and the Venturi tube larynx
Portion (15.3) transition position inner surface processes groove and built-up welding hard wear-resistant material (15.2.1) in groove.
3. high-precision integrative core according to claim 1 level Venturi tube, it is characterised in that the first positioning butt welding
Gasket seal (17) is provided between flange (13) and the described second positioning W.N flange (14), will be described by fastener (18)
First positioning W.N flange (13) is connected with the described second positioning W.N flange (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310205081.4A CN103791953B (en) | 2013-05-28 | 2013-05-28 | High-precision integrative core level Venturi tube |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310205081.4A CN103791953B (en) | 2013-05-28 | 2013-05-28 | High-precision integrative core level Venturi tube |
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| CN103791953A CN103791953A (en) | 2014-05-14 |
| CN103791953B true CN103791953B (en) | 2017-06-09 |
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ID=50667835
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108593020A (en) * | 2018-04-08 | 2018-09-28 | 江阴市节流装置厂有限公司 | A kind of Venturi tube flow rate-measuring device and installation method |
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| CN105043466A (en) * | 2015-08-12 | 2015-11-11 | 银川融神威自动化仪表厂(有限公司) | High-online diffusing pipe double rectangular flowmeter |
| CN106643924A (en) * | 2016-12-28 | 2017-05-10 | 中国科学院上海应用物理研究所 | High-temperature conducting liquid flow quantity measurement device and method based on Venturi tube |
| CN109141548A (en) * | 2018-09-14 | 2019-01-04 | 杭州成套节流装置有限公司 | A kind of Venturi nozzle and processing technology |
| CN111750938B (en) * | 2020-06-17 | 2022-03-18 | 江阴市节流装置厂有限公司 | Large-scale high accuracy owner feedwater venturi subassembly |
| CN111982214A (en) * | 2020-08-28 | 2020-11-24 | 中国人民解放军63919部队 | Micro-differential pressure ventilation flow sensor venturi tube |
| CN114005556B (en) * | 2021-10-25 | 2023-03-21 | 山东核电设备制造有限公司 | Combined type current-limiting Venturi tube suitable for CVS and machining method thereof |
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| CN102359800A (en) * | 2011-10-10 | 2012-02-22 | 苍南自动化仪表厂 | Locally-integrated butt-welding venturi tube |
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| US4651572A (en) * | 1985-02-20 | 1987-03-24 | Krupp-Koppers Gmbh | Venturi tube |
| CN201173794Y (en) * | 2008-03-11 | 2008-12-31 | 杭州华达诺自动化设备有限公司 | Integral concealed Venturi |
| CN201795816U (en) * | 2010-08-25 | 2011-04-13 | 中冶东方工程技术有限公司 | Hot-dirty generator gas flow detection device |
| CN102359800A (en) * | 2011-10-10 | 2012-02-22 | 苍南自动化仪表厂 | Locally-integrated butt-welding venturi tube |
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| CN108593020A (en) * | 2018-04-08 | 2018-09-28 | 江阴市节流装置厂有限公司 | A kind of Venturi tube flow rate-measuring device and installation method |
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| Publication number | Publication date |
|---|---|
| CN103791953A (en) | 2014-05-14 |
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