CN203642969U - Venturi tube - Google Patents
Venturi tube Download PDFInfo
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- CN203642969U CN203642969U CN201320699077.3U CN201320699077U CN203642969U CN 203642969 U CN203642969 U CN 203642969U CN 201320699077 U CN201320699077 U CN 201320699077U CN 203642969 U CN203642969 U CN 203642969U
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- venturi tube
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Abstract
The utility model discloses a venturi tube. The venturi tube comprises a venturi tube main body, wherein the venturi tube main body includes an inlet cylinder section, a cone shrinkage section, a cylinder choke section and a cone dispersion section arranged in sequence, wherein a positive pressure tube is arranged on the inlet cylinder section in the radial direction of the venturei tube; a negative pressure tube is arranged on the cylinder choke section in the radial direction of the venturei tube; the front end of the venturi tube main body is connected with a front measurement tube, and the back end of the venturi tube main body is connected with a back measurement tube; the front end of the front measurement tube is connected with a rectifier; the front end of the rectifier is connected with a rectifier measurement tube; the front end of the rectifier measurement tube is connected with a technological flange. As the precisely processed front and back measurement tubes are arranged at the front and back ends of the traditional venturi tubes, and the rectifier is arranged on the front measurement tube, the measurement precision is improved to achieve the use standard.
Description
Technical field
The utility model relates to a kind of Venturi tube.
Background technology
CAP1000 nuclear power technology, that China assimilates advanced foreign technologies and further refine them and autonomous innovation, it is unique new three generations+nuclear power technology that obtains U.S.'s core pipe meeting final design approval, China has taken the lead in grasping the five large core key technologies of generation Ⅲ nuclear power CAP1000 in the world, for the entirety that advances Chinese Nuclear Power level of industrial technology is crossed over, for the autonomy-oriented, the mass construction that realize Chinese generation Ⅲ nuclear power AP1000 lay a solid foundation.This technology is the safest, state-of-the-art business nuclear power technology in current global nuclear power market, and it is one of its gordian technique feature that the nuclear power plant of this technology moves easier, and this just must be equipped with state-of-the-art Instrumentation and Control system in industry.Flow measurement for main feedwater is just even more important, and the performance of main feedwater flow measurement mechanism directly has influence on the safety and efficiently operation of nuclear power plant, so this just must exploitation be applicable to main feedwater high security, large flow, high-precision flow measurement device.
Main shorter to Venturi tube at present, front and back are measuring tube are set, if measuring tube is only user's autogamy, because making measuring accuracy, line size precision reason declines, and due to the flow-disturbing reason of anterior choked flow piece, make fully turbulent flow of a fluid stream, thereby measuring accuracy is reduced greatly.
Utility model content
The purpose of this utility model is to overcome the defect existing in prior art, and the Venturi tube that a kind of measuring accuracy is high is provided.
For achieving the above object, the technical solution of the utility model has been to provide a kind of Venturi tube, comprise Venturi tube body, described Venturi tube body comprises the entrance cylindrical section being arranged in order, circular cone contraction section, cylinder trunnion section and circular cone diffuser, radially be provided with positive pressure pipe along Venturi tube on described entrance cylindrical section, radially be provided with negative pressure pipe along Venturi tube in described cylinder trunnion section, the leading section of described venturi body is connected with before measurement buret, thereafter end is connected with rear measuring tube, the leading section of described before measurement buret is connected with rectifier, the leading section of described rectifier is connected with rectifier measuring tube, the leading section of described rectifier measuring tube is connected with process flange.
As preferably, the length of described before measurement buret is its caliber 18 times.
As preferably, described before measurement buret, described rear measuring tube are connected by flange with described venturi body respectively, described rectifier measuring tube, described before measurement buret are connected by flange with described rectifier respectively, install, dismantle all more convenient.
As preferably, between described process flange and described rectifier measuring tube, between described rectifier and described rectifier measuring tube and described before measurement buret, between described before measurement buret and described venturi body, between described venturi body and described rear measuring tube, be respectively arranged with sealing gasket, for improving sealing effectiveness.
As preferably, on described circular cone contraction section, be provided with peephole device.
As preferably, described peephole device comprises circular cone contraction section excircle and the coupled logical peep-hole flange described in being arranged at, in described peep-hole flange, be provided with the peep-hole plug matching with it, described peep-hole plug is located by register pin mutually with described peep-hole flange.
As preferably, the outside surface of the lower surface of described peep-hole plug and described circular cone contraction section is suitable.
As preferably, described register pin has two, is arranged at respectively the both sides of described peep-hole plug, and the described register pin of both sides is obliquely installed, in full accord to ensure position and the original position installed next time.
As preferably, the angle between the described register pin of both sides is 135 °.
Advantage of the present utility model and beneficial effect are: by the front and back of the Venturi tube traditional arrange through the before measurement buret of accurate processing and after measuring tube, on this external pre-test pipe, rectifier is set, improve measuring accuracy, reach use standard.
Brief description of the drawings
Fig. 1 is schematic diagram of the present utility model.
Wherein: 1, Venturi tube body; 2, positive pressure pipe; 3, negative pressure pipe; 4, before measurement buret; 5, rear measuring tube; 6, rectifier; 7, rectifier measuring tube; 8, process flange; 9, peep-hole flange; 10, peep-hole plug.
Embodiment
Below in conjunction with drawings and Examples, embodiment of the present utility model is further described.Following examples are only for the technical solution of the utility model is more clearly described, and can not limit protection domain of the present utility model with this.
As shown in Figure 1, a kind of Venturi tube, comprise Venturi tube body 1, described Venturi tube body 1 comprises the entrance cylindrical section being arranged in order, circular cone contraction section, cylinder trunnion section and circular cone diffuser, on described entrance cylindrical section along the positive pressure pipe 2 of being radially provided with of Venturi tube, in described cylinder trunnion section, bear pressure pipe 3 along being radially provided with of Venturi tube, the leading section of venturi body is connected with before measurement buret 4, thereafter end is connected with rear measuring tube 5, the leading section of before measurement buret 4 is connected with rectifier 6, the leading section of rectifier 6 is connected with rectifier measuring tube 7, the leading section of rectifier measuring tube 7 is connected with process flange 8, the length of before measurement buret 4 is 18 times of its caliber.
As shown in Figure 1, before measurement buret 4, rear measuring tube 5 are connected by flange with venturi body respectively, and rectifier measuring tube 7, before measurement buret 4 are connected by flange with rectifier 6 respectively.
As shown in Figure 1, between process flange 8 and rectifier measuring tube 7, between rectifier 6 and rectifier measuring tube 7 and before measurement buret 4, between before measurement buret 4 and venturi body, between venturi body and rear measuring tube 5, be respectively arranged with sealing gasket.
As shown in Figure 1, on circular cone contraction section, be provided with peephole device, peephole device comprises and is arranged at circular cone contraction section excircle and coupled logical peep-hole flange 9, in peep-hole flange 9, be provided with the peep-hole plug 10 matching with it, peep-hole plug 10 is located by register pin mutually with peep-hole flange 9, the outside surface of the lower surface of peep-hole plug 10 and circular cone contraction section is suitable, register pin has two, be arranged at respectively the both sides of peep-hole plug 10, the register pin of both sides is obliquely installed, and the angle between the register pin of both sides is 135 °.
Make this device there is following technical characterstic:
High security: high precision Venturi tube body 1 adopts integral die Forging Technology, guarantees that rough forging approaches finished form substantially, thereby has ensured that the mechanical property of material itself and institutional framework meet the needs of the characteristic of high pressure;
Large flow: because the Peak Flow Rate of the design of CAP1000 technology nuclear power station owner feedwater reaches 10m/s, so flowmeter must can be applicable to large flow, the design has selected overcurrent shape is best, the pressure loss is little Venturi tube body 1 as crucial measurement mechanism, thereby makes flow range meet request for utilization completely;
High precision: be ± 0.25% because CAP1000 technology nuclear power station owner feedwater requires measuring accuracy, so adopt following design proposal to ensure flow measurement precision.
First the machining precision of guaranteeing Venturi tube body 1 meets design requirement completely, in be controlled at ± 0.05% scope of dimensional tolerence;
4 pairs of positive and negative pressure ports adopt special frock processing, ensure that pressure port position is no more than 0.1mm;
The edge machining precision of pressure port has a strong impact on measuring accuracy, so the edge of pressure port adopts the mode of craft+Hard maple to carry out hand grinding, guarantees pressure precision;
The measurement pipeline section of the sufficiently long accurate processing of Venturi tube body 1 front and back equipment, in be controlled at ± 0.1% scope of pipeline processing precision, thereby ensures a fluid stream steady smooth flow state in pipeline;
Locate to be provided with rectifier 6 first 18 times of Venturi tube body 1, thereby make fluid keep fully turbulent flow before arriving measuring section, to guarantee flow measurement precision.
The above is only preferred implementation of the present utility model; should be understood that; for those skilled in the art; do not departing under the prerequisite of the utility model know-why; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (9)
1. a Venturi tube, comprise Venturi tube body, described Venturi tube body comprises the entrance cylindrical section being arranged in order, circular cone contraction section, cylinder trunnion section and circular cone diffuser, radially be provided with positive pressure pipe along Venturi tube on described entrance cylindrical section, radially be provided with negative pressure pipe along Venturi tube in described cylinder trunnion section, it is characterized in that: the leading section of described venturi body is connected with before measurement buret, thereafter end is connected with rear measuring tube, the leading section of described before measurement buret is connected with rectifier, the leading section of described rectifier is connected with rectifier measuring tube, the leading section of described rectifier measuring tube is connected with process flange.
2. Venturi tube as claimed in claim 1, is characterized in that: the length of described before measurement buret is its caliber 18 times.
3. Venturi tube as claimed in claim 1, it is characterized in that: described before measurement buret, described rear measuring tube are connected by flange with described venturi body respectively, described rectifier measuring tube, described before measurement buret are connected by flange with described rectifier respectively.
4. Venturi tube as claimed in claim 3, is characterized in that: between described process flange and described rectifier measuring tube, between described rectifier and described rectifier measuring tube and described before measurement buret, between described before measurement buret and described venturi body, be respectively arranged with sealing gasket between described venturi body and described rear measuring tube.
5. Venturi tube as claimed in claim 1, is characterized in that: on described circular cone contraction section, be provided with peephole device.
6. Venturi tube as claimed in claim 5, it is characterized in that: described peephole device comprises circular cone contraction section excircle and the coupled logical peep-hole flange described in being arranged at, in described peep-hole flange, be provided with the peep-hole plug matching with it, described peep-hole plug is located by register pin mutually with described peep-hole flange.
7. Venturi tube as claimed in claim 6, is characterized in that: the outside surface of the lower surface of described peep-hole plug and described circular cone contraction section is suitable.
8. Venturi tube as claimed in claim 7, is characterized in that: described register pin has two, is arranged at respectively the both sides of described peep-hole plug, and the described register pin of both sides is obliquely installed.
9. Venturi tube as claimed in claim 8, is characterized in that: the angle between the described register pin of both sides is 135 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320699077.3U CN203642969U (en) | 2013-11-06 | 2013-11-06 | Venturi tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320699077.3U CN203642969U (en) | 2013-11-06 | 2013-11-06 | Venturi tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203642969U true CN203642969U (en) | 2014-06-11 |
Family
ID=50874204
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320699077.3U Expired - Fee Related CN203642969U (en) | 2013-11-06 | 2013-11-06 | Venturi tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203642969U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103674130A (en) * | 2013-11-06 | 2014-03-26 | 江阴市节流装置厂有限公司 | Venturi tube |
| 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 |
| CN109695748A (en) * | 2018-07-23 | 2019-04-30 | 陕西汇丰悦石油科技开发有限公司 | A kind of duplex valving |
-
2013
- 2013-11-06 CN CN201320699077.3U patent/CN203642969U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103674130A (en) * | 2013-11-06 | 2014-03-26 | 江阴市节流装置厂有限公司 | Venturi tube |
| 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 |
| CN109695748A (en) * | 2018-07-23 | 2019-04-30 | 陕西汇丰悦石油科技开发有限公司 | A kind of duplex valving |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140611 Termination date: 20181106 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |