CN100449274C - Inside-hiding throttler - Google Patents
Inside-hiding throttler Download PDFInfo
- Publication number
- CN100449274C CN100449274C CNB031342736A CN03134273A CN100449274C CN 100449274 C CN100449274 C CN 100449274C CN B031342736 A CNB031342736 A CN B031342736A CN 03134273 A CN03134273 A CN 03134273A CN 100449274 C CN100449274 C CN 100449274C
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- tube
- pipe
- wing plate
- throat
- venturi tubes
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Abstract
The present invention relates to a fluid measuring apparatus, particularly to a built-in throttling gear, which comprises venturi tubes and a total static pressure exploring tube that are in a sleeve joint to form the built-in throttling gear, wherein the venturi tubes comprise a front straight pipe, a front conical tube, a throat straight pipe, a back conical tube, a pressure sampling pipe, a wing plate and an outer ring casing. The present invention is characterized in that one of the venturi tubes is arranged in and connected with the total static pressure exploring tube, the throat straight tube of the venturi tubes is a round tube, the ingress of the front conical tube is in the shape of a bell mouth, the cone angle of the front conical tube is between 20 DEG to 42 DEG, the cone angle of the back conical tube is between 7 DEG to 15 DEG, the contraction ratio of the front conical tube is larger than the contraction ratio of the back conical tube, the venturi tubes are in sleeve joint in the total static pressure exploring tube through the wing plate, the wing plate is evenly distributed into four parts and both ends of the wing plate are respectively fixed in the total static pressure exploring tube and on the venturi tubes. The built-in throttling gears can provide higher pressure difference, which makes the measuring range broader and the measuring accuracy higher. The built-in throttling gears has simple structure and long service life.
Description
Technical field:
The invention belongs to fluid measurement instrument, particularly about a kind of hidden throttling device.
Background technology:
Known built-in dual-venturi fluid measurement instrument, it is applicable to the big caliber of low speed, the flow measurement of clean gas medium, a kind of built-in dual-venturi fluid measurement instrument is disclosed as the patent No.: ZL01213038.9, because it is to adopt the double-venturi tube socket to constitute, outside Venturi tube and inner Venturi tube are contracted in throat's gas for twice easy generation eddy current when mixing especially reaches 15m/s when above testing the speed, throat's differential pressure progressively strengthens, and the stability when high velocity stream progressively descends.Secondly, throat easily stops up when measuring media is dirtier, influences normal pressure.
Summary of the invention:
The objective of the invention is: a kind of hidden throttling device is provided, and it can overcome above-mentioned shortcoming, and higher pressure difference is provided, and makes measurement range wider, and measuring accuracy is higher, and it is simple in structure, long service life.
Technical scheme of the present invention is: design a kind of hidden throttling device, it comprises Venturi tube, total, static pressure sound-pipe formation, Venturi tube comprises preceding straight tube, preceding Taper Pipe, throat's straight tube, back Taper Pipe, pressure pipe, wing plate, outer circular chamber composition, it is characterized in that: be connected with a Venturi tube in total, the static pressure sound-pipe, throat's straight tube of Venturi tube is the pipe section, inner cone tube inlet place is the hydraucone shape, and the shrinkage ratio of preceding Taper Pipe is greater than the shrinkage ratio of back Taper Pipe.
Described Taper Pipe, the cone angle of preceding Taper Pipe are chosen in 20 °～42 °, and the cone angle of back Taper Pipe is chosen in 7 °～15 °.
Described Venturi tube by wing plate always be socketed in, in the static pressure sound-pipe; Wing plate is that quarter evenly distributes, two ends be separately fixed in the combined Pitot static probe and Venturi tube on.
Described pressure pipe total, the static pressure sound-pipe is communicated with respectively on the pressure port at preceding straight tube and throat straight tube center.
Described straight tube inside surface has antistick layer.
Principal feature of the present invention is:
1, pressure reduction is big: the present invention adopts a Venturi tube, and it is simple in structure, has improved mobility status, reduces flow losses, and the flow that flows into Venturi tube is increased, and contraction section adopts big angle of throat, and institute is so that throat's gas velocity increases, and static pressure reduces.At the stagnation pressure of preceding supporting collection air-flow, the difference of the two just increases very big.
2, the present invention adopts one section straight pipe section in Venturi tube throat, and the mobile of its throat improved, and flows relatively steadily, so static pressure fluctuation is very little, has improved measuring stability.
3, the present invention adopts symmetrical isobaric wing plate to link to each other with total, static pressure sound-pipe, has avoided the asymmetric caused additional aerodynamic force of wing plate to structure and bubble-tight destruction, thereby has improved the reliability of system.
4, because differential pressure of the present invention is big, thus differential flow improve than resolution, thereby make measurement more accurate, measurement range increasing.
5, quarter wing plate symmetry connects the destruction of having avoided stress distribution to cause.
6, because straight tube inside surface of the present invention has antistick layer, make long product lifecycle, improved precision.
Description of drawings:
The present invention will be further described below in conjunction with the embodiment accompanying drawing.
Accompanying drawing 1 is embodiment 1 structural representation.
Accompanying drawing 2 is embodiment 2 structural representations.
Among the figure: 1, flange; 2, pressure pipe; 3, outer circular chamber; 4, total, static pressure sound-pipe; 5, antistick layer; 6, wing plate; 7, preceding straight tube; 8, preceding Taper Pipe; 9, throat's straight tube; 10, back Taper Pipe; 11, blowdown mouth; 12, pressure mouth.
Embodiment:
Embodiment 1 is as shown in Figure 1: it is made of hidden throttling device total, static pressure sound-pipe 4 and Venturi tube socket, always, there is flange 1 at static pressure sound-pipe 4 two ends, so that install, Venturi tube is in turn connected into one and is formed by preceding straight tube 7, preceding Taper Pipe 8, throat's straight tube 9, back Taper Pipe 10, before one end of pressure pipe 2 is connected on the pressure port of the pressure port of straight tube 7 and throat's straight tube 9, the other end of pressure pipe 2 is communicated with outer circular chamber 3, the outer circular chamber 3 on pressure pipe 2 tops is communicated with pressure mouth 12, and the outer circular chamber 3 of pressure pipe 2 bottoms is communicated with blowdown mouth 11.Venturi tube by wing plate 6 always be socketed in, on the static pressure sound-pipe 4.Wing plate 6 is that quarter evenly distributes.Preceding Taper Pipe 8 is gone into bore dia 300mm, and cone angle is 21 °, and throat's straight tube 9 is straight pipe segment length 129mm, and it is that the 260mm cone angle is 10 ° that back Taper Pipe 10 draws bore dia.The inside surface of throat's straight tube 9 is coated with antistick layer, has improved product serviceable life, precision is improved one grade.
Claims (2)
1, hidden throttling device, it comprises Venturi tube, combined Pitot static probe (4), Venturi tube comprises preceding straight tube (7), preceding Taper Pipe (8), throat's straight tube (9), Taper Pipe (10), pressure pipe (2), the wing plate (6) that is used for the socket Venturi tube, outer circular chamber (3), straight tube (7) before described, preceding Taper Pipe (8), throat's straight tube (9) is connected successively with back Taper Pipe (10), it is characterized in that: described Venturi tube is connected in the combined Pitot static probe (4), throat's straight tube (9) of Venturi tube is the pipe section, preceding Taper Pipe (8) porch is the hydraucone shape, the exit of back Taper Pipe (10) is the hydraucone shape, before the cone angle of Taper Pipe (8)--42 °, the cone angle of back Taper Pipe (10) is chosen in 7 °--15 ° that be chosen in 20 °
2, hidden throttling device according to claim 1 is characterized in that: described Venturi tube is socketed in the combined Pitot static probe (4) by wing plate (6); Wing plate (6) is that quarter evenly distributes, two ends be separately fixed in the combined Pitot static probe (4) and Venturi tube on; Pressure pipe (2) is communicated with respectively on the pressure port at preceding straight tube (7) and throat's straight tube (9) center.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031342736A CN100449274C (en) | 2003-06-03 | 2003-06-03 | Inside-hiding throttler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031342736A CN100449274C (en) | 2003-06-03 | 2003-06-03 | Inside-hiding throttler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1553150A CN1553150A (en) | 2004-12-08 |
| CN100449274C true CN100449274C (en) | 2009-01-07 |
Family
ID=34323147
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031342736A Expired - Fee Related CN100449274C (en) | 2003-06-03 | 2003-06-03 | Inside-hiding throttler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100449274C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101893462A (en) * | 2010-06-28 | 2010-11-24 | 江阴市节流装置厂有限公司 | Extension-type Venturi tube and processing method and application method thereof |
| CN102042853B (en) * | 2010-11-17 | 2012-07-11 | 西安中望流量仪表有限公司 | Internal-mounted combined type Venturi nozzle throttle mechanism |
| CN104501884A (en) * | 2014-12-08 | 2015-04-08 | 上海科洋科技股份有限公司 | Rectangular flowmeter |
| CN107764344A (en) * | 2016-08-16 | 2018-03-06 | 王子平 | For measuring the rectangle flowmeter of gas flow |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3686946A (en) * | 1970-06-22 | 1972-08-29 | Gen Signal Corp | Flow metering devices of the pressure differential producing type |
| CN1309284A (en) * | 2000-09-09 | 2001-08-22 | 党晓民 | Design method and equipment of built-in dual-venturi fluid measurer |
| US6314821B1 (en) * | 1996-09-03 | 2001-11-13 | Expro North Sea Limited | Annular flow monitoring apparatus |
| CN2480813Y (en) * | 2001-02-26 | 2002-03-06 | 西安中望流量仪表有限公司 | Built-in double-venturi fluid measurer |
| CN2574013Y (en) * | 2002-10-26 | 2003-09-17 | 西安中望流量仪表有限公司 | Built-in throttle device |
-
2003
- 2003-06-03 CN CNB031342736A patent/CN100449274C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3686946A (en) * | 1970-06-22 | 1972-08-29 | Gen Signal Corp | Flow metering devices of the pressure differential producing type |
| US6314821B1 (en) * | 1996-09-03 | 2001-11-13 | Expro North Sea Limited | Annular flow monitoring apparatus |
| CN1309284A (en) * | 2000-09-09 | 2001-08-22 | 党晓民 | Design method and equipment of built-in dual-venturi fluid measurer |
| CN2480813Y (en) * | 2001-02-26 | 2002-03-06 | 西安中望流量仪表有限公司 | Built-in double-venturi fluid measurer |
| CN2574013Y (en) * | 2002-10-26 | 2003-09-17 | 西安中望流量仪表有限公司 | Built-in throttle device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1553150A (en) | 2004-12-08 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| 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: 20090107 Termination date: 20170603 |
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| CF01 | Termination of patent right due to non-payment of annual fee |