CN103674130B - A kind of Venturi tube - Google Patents
A kind of Venturi tube Download PDFInfo
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- CN103674130B CN103674130B CN201310548324.4A CN201310548324A CN103674130B CN 103674130 B CN103674130 B CN 103674130B CN 201310548324 A CN201310548324 A CN 201310548324A CN 103674130 B CN103674130 B CN 103674130B
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Abstract
The invention discloses a kind of Venturi tube, including Venturi tube body, described Venturi tube body includes the inlet cylinders section being arranged in order, circular cone contraction section, cylinder trunnion section and circular cone diffuser, described inlet cylinders section is radially provided with positive pressure pipe along Venturi tube, described cylinder trunnion section is radially provided with negative pressure pipe along Venturi tube, the leading section of venturi body connects pre-test pipe, thereafter end connection measures pipe after having, the leading section of pre-test pipe connects rectifier, the leading section of rectifier connects has rectifier to measure pipe, the leading section connection of pipe measured by rectifier process flange, by arrange before and after traditional Venturi tube through accurately processing pre-test pipe and after measure pipe, on this external pre-test pipe, rectifier is set, improve certainty of measurement, reach use standard.
Description
Technical field
The present invention relates to a kind of Venturi tube.
Background technology
CAP1000 nuclear power technology, it is that China assimilates advanced foreign technologies and further refine them and autonomous innovation, it it is the new three generations+nuclear power technology uniquely obtaining U.S.'s core pipe meeting final design approval, China takes the lead in having grasped the five big core key technologies of generation Ⅲ nuclear power CAP1000 in the world, for advancing the overall leap of Chinese Nuclear Power level of industrial technology, for realizing China's autonomy-oriented of generation Ⅲ nuclear power AP1000, mass construction lays a solid foundation.This technology is business nuclear power technology the safest, state-of-the-art in the most global nuclear power market, and it is one of its key technology feature that the nuclear power plant of this technology runs easier, and this is necessary for being equipped with state-of-the-art instrument and control system in industry.Flow measurement for main feedwater is the most even more important, and the performance of main feedwater flow measurement apparatus directly influences safety and the Effec-tive Function of nuclear power plant, so this is necessary for exploitation is suitable for main feedwater high security, big flow, high-precision flow measurement device.
The most main shorter to Venturi tube, front and back it is and measurement pipe is set, if measuring pipe is only user's autogamy, owing to line size precision reason makes certainty of measurement decline, and due to the flow-disturbing reason of anterior choked flow piece, make a fluid stream can not be fully turbulent, so that certainty of measurement is substantially reduced.
Summary of the invention
It is an object of the invention to overcome defect present in prior art, it is provided that the Venturi tube that a kind of certainty of measurement is high.
For achieving the above object, the technical scheme is that and provide a kind of Venturi tube, including Venturi tube body, described Venturi tube body includes the inlet cylinders section being arranged in order, circular cone contraction section, cylinder trunnion section and circular cone diffuser, described inlet cylinders section is radially provided with positive pressure pipe along Venturi tube, described cylinder trunnion section is radially provided with negative pressure pipe along Venturi tube, the leading section of described venturi body connects pre-test pipe, thereafter end connection measures pipe after having, the leading section of described pre-test pipe connects rectifier, the leading section of described rectifier connects has rectifier to measure pipe, the leading section connection of pipe measured by described rectifier process flange.
As preferably, 18 times of its caliber a length of of described pre-test pipe.
As preferably, described pre-test pipe, described rear measurement pipe are connected by flange with described venturi body respectively, pipe measured by described rectifier, described pre-test pipe is connected by flange with described rectifier respectively, install, dismantle the most more convenient.
As preferably, described process flange and described rectifier are measured between pipe, described rectifier and described rectifier are measured between pipe and described pre-test pipe, between described pre-test pipe and described venturi body, it is respectively arranged with sealing gasket between described venturi body and described rear measurement pipe, is used for improving sealing effectiveness.
As preferably, described circular cone contraction section is provided with peephole device.
As preferably, described peephole device includes being arranged at described circular cone contraction section excircle and coupled logical peep-hole flange, being provided with the peep-hole plug being matched therewith in described peep-hole flange, described peep-hole plug is positioned by alignment pin mutually with described peep-hole flange.
As preferably, the lower surface of described peep-hole plug is suitable with the outer surface of described circular cone contraction section.
As preferably, described alignment pin has two, is respectively arranged at the both sides of described peep-hole plug, and the described alignment pin of both sides is obliquely installed, completely the same with original position to ensure the position installed next time.
As preferably, the angle between the described alignment pin of both sides is 135 °.
Advantages of the present invention and having the beneficial effects that: by arrange before and after traditional Venturi tube through accurately processing pre-test pipe and after measure pipe, this external pre-test pipe arranges rectifier, improves certainty of measurement, reach use standard.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the present invention.
Wherein: 1, Venturi tube body；2, positive pressure pipe；3, negative pressure pipe；4, pre-test pipe；5, pipe is measured afterwards；6, rectifier；7, pipe measured by rectifier；8, process flange；9, peep-hole flange；10, peep-hole plug.
Detailed description of the invention
Below in conjunction with the accompanying drawings and embodiment, the detailed description of the invention of the present invention is further described.Following example are only used for clearly illustrating technical scheme, and can not limit the scope of the invention with this.
As shown in Figure 1, a kind of Venturi tube, including Venturi tube body 1, described Venturi tube body 1 includes the inlet cylinders section being arranged in order, circular cone contraction section, cylinder trunnion section and circular cone diffuser, described inlet cylinders section is radially provided with positive pressure pipe 2 along Venturi tube, described cylinder trunnion section is radially provided with negative pressure pipe 3 along Venturi tube, the leading section of venturi body connects pre-test pipe 4, thereafter end connection measures pipe 5 after having, the leading section of pre-test pipe 4 connects rectifier 6, the leading section of rectifier 6 connects has rectifier to measure pipe 7, the leading section connection of pipe 7 measured by rectifier process flange 8, 18 times of its caliber a length of of pre-test pipe 4.
As it is shown in figure 1, pre-test pipe 4, rear pipe 5 of measuring are connected by flange with venturi body respectively, pipe 7 measured by rectifier, pre-test pipe 4 is connected by flange with rectifier 6 respectively.
As it is shown in figure 1, process flange 8 and rectifier are measured between pipe 7, rectifier 6 and rectifier are measured between pipe 7 and pre-test pipe 4, and between pre-test pipe 4 and venturi body, venturi body and rear measurement are respectively arranged with sealing gasket between pipe 5.
As shown in Figure 1, it is provided with peephole device on circular cone contraction section, peephole device includes being arranged at circular cone contraction section excircle and coupled logical peep-hole flange 9, the peep-hole plug 10 being matched therewith it is provided with in peep-hole flange 9, peep-hole plug 10 is positioned by alignment pin mutually with peep-hole flange 9, the lower surface of peep-hole plug 10 is suitable with the outer surface of circular cone contraction section, alignment pin has two, it is respectively arranged at the both sides of peep-hole plug 10, the alignment pin of both sides is obliquely installed, and the angle between the alignment pin of both sides is 135 °.
This device is made to have a techniques below feature:
High security: Venturi tube body 1 uses integral die Forging Technology in high precision, it is ensured that rough forging is substantially close to finished form, thus ensure that the mechanical performance of material itself and institutional framework meet the needs of the characteristic of high pressure；
Big flow: owing to the Peak Flow Rate of the design of CAP1000 technology nuclear power station owner feedwater reaches 10m/s, so flowmeter must be able to be applicable to big flow, the design had selected and had crossed manifold shape is best, the pressure loss is little Venturi tube body 1 as crucial measurement apparatus, so that range of flow fully meets to meet uses requirement；
In high precision: owing to CAP1000 technology nuclear power station owner feedwater requires that certainty of measurement is ± 0.25%, so using following design to ensure flow measurement precision.
First ensuring that the machining accuracy of Venturi tube body 1 fully meets design requirement, dimensional tolerance controls in the range of ± 0.05%；
4 pairs of positive and negative pressure ports use the processing of special frock, it is ensured that pressure port position is less than 0.1mm；
The edge machining accuracy of pressure port has a strong impact on certainty of measurement, so the mode that the edge of pressure port uses craft+Hard maple carries out hand grinding, it is ensured that pressure precision；
Equipping the measurement pipeline section of sufficiently long accurate processing before and after Venturi tube body 1, pipeline processing precision controlling is in the range of ± 0.1%, thus ensures the flow regime that a fluid stream is the most smooth in pipeline；
It is provided with rectifier 6, so that fluid keeps fully turbulent flow before arriving measuring section, to guarantee flow measurement precision at first 18 times of Venturi tube body 1.
The above is only the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, on the premise of without departing from the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (4)
- null1. a Venturi tube，Including Venturi tube body，Described Venturi tube body includes the inlet cylinders section being arranged in order、Circular cone contraction section、Cylinder trunnion section and circular cone diffuser，Described inlet cylinders section is radially provided with positive pressure pipe along Venturi tube，Described cylinder trunnion section is radially provided with negative pressure pipe along Venturi tube，It is characterized in that: the leading section of described venturi body connects pre-test pipe，Thereafter end connection measures pipe after having，The leading section of described pre-test pipe connects rectifier，The leading section of described rectifier connects has rectifier to measure pipe，The leading section connection of pipe measured by described rectifier process flange，The pipeline processing precision controlling of described pre-test pipe is in the range of ± 0.1%，18 times of its caliber a length of of described pre-test pipe，It is provided with peephole device on described circular cone contraction section，Described peephole device includes being arranged at described circular cone contraction section excircle and coupled logical peep-hole flange，The peep-hole plug being matched therewith it is provided with in described peep-hole flange，Described peep-hole plug is positioned by alignment pin mutually with described peep-hole flange，The lower surface of described peep-hole plug is suitable with the outer surface of described circular cone contraction section，Described alignment pin has two，It is respectively arranged at the both sides of described peep-hole plug，The described alignment pin of both sides is obliquely installed.
- 2. Venturi tube as claimed in claim 1, it is characterized in that: described pre-test pipe, described rear measurement pipe are connected by flange with described venturi body respectively, pipe measured by described rectifier, described pre-test pipe is connected by flange with described rectifier respectively.
- 3. Venturi tube as claimed in claim 2, it is characterised in that: described process flange and described rectifier are measured between pipe, described rectifier and described rectifier are measured between pipe and described pre-test pipe, between described pre-test pipe and described venturi body, are respectively arranged with sealing gasket between described venturi body and described rear measurement pipe.
- 4. Venturi tube as claimed in claim 1, it is characterised in that: the angle between the described alignment pin of both sides is 135 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310548324.4A CN103674130B (en) | 2013-11-06 | 2013-11-06 | A kind of Venturi tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310548324.4A CN103674130B (en) | 2013-11-06 | 2013-11-06 | A kind of Venturi tube |
Publications (2)
| Publication Number | Publication Date |
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| CN103674130A CN103674130A (en) | 2014-03-26 |
| CN103674130B true CN103674130B (en) | 2016-09-07 |
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| CN201310548324.4A Active CN103674130B (en) | 2013-11-06 | 2013-11-06 | A kind of Venturi tube |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108844673A (en) * | 2018-06-27 | 2018-11-20 | 天津浩天自动化仪表制造有限公司 | A kind of rectification type Venturi tube pressure difference measuring device |
| CN109704450B (en) * | 2019-03-05 | 2023-10-20 | 苏州方舟环保科技有限公司 | High-efficient waste water dissolves gas processing apparatus |
| CN111141342B (en) * | 2020-04-07 | 2020-07-28 | 潍柴动力股份有限公司 | Venturi flow meter |
| CN111157063B (en) * | 2020-04-07 | 2020-08-21 | 潍柴动力股份有限公司 | Venturi flow meter |
| 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 |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002081976A (en) * | 2000-09-06 | 2002-03-22 | Yamatake Corp | Constriction structure of differential pressure type flowmeter |
| JP2008281976A (en) * | 2007-04-09 | 2008-11-20 | M & S Fine Tec Kk | Backlight for liquid crystal display device |
| CN201697647U (en) * | 2010-06-28 | 2011-01-05 | 江阴市节流装置厂有限公司 | Extension-type Venturi tube |
| CN202869560U (en) * | 2012-10-27 | 2013-04-10 | 江阴市神州测控设备有限公司 | Integrated venturi nozzle |
| CN102928030A (en) * | 2012-11-27 | 2013-02-13 | 银川融神威自动化仪表厂(有限公司) | Matrix Venturi type cross section flowmeter |
| CN203642969U (en) * | 2013-11-06 | 2014-06-11 | 江阴市节流装置厂有限公司 | Venturi tube |
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| CN103674130A (en) | 2014-03-26 |
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Denomination of invention: Wind-powered machine rotor with venturi tube effect Effective date of registration: 20180703 Granted publication date: 20160907 Pledgee: Bank of Communications Ltd Wuxi branch Pledgor: JIANGYIN THROTTLING DEVICE MANUFACTURER CO., LTD. Registration number: 2018320010026 |
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