CN204330032U - A kind of double diameter-changeable measuring tube of vortex shedding flow meter - Google Patents
A kind of double diameter-changeable measuring tube of vortex shedding flow meter Download PDFInfo
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- CN204330032U CN204330032U CN201420691020.3U CN201420691020U CN204330032U CN 204330032 U CN204330032 U CN 204330032U CN 201420691020 U CN201420691020 U CN 201420691020U CN 204330032 U CN204330032 U CN 204330032U
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- flow meter
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Abstract
The utility model relates to a kind of double diameter-changeable measuring tube of vortex shedding flow meter.Comprise flange, measuring tube, it is characterized in that: also comprise two contracting reducer pipe, sounding body, one end of two two contracting reducer pipes is inserted in a flange hole fixing respectively; The other end of two two contracting reducer pipes inserts the two ends mouth of pipe internal fixtion of measuring tube respectively; Shedder is inserted in triangle through hole that measuring tube upper and lower tube wall is arranged with, shedder two ends respectively with measuring tube upper and lower tube wall fix.Effect is: pipe design twice contraction, special fluid passage can make the stable separation of whirlpool, the hydraucone of inlet end shrinks steady flow condition, the ellipticity of endpiece is shunk, and the fluid passage of circle is shrunk to circle of contact path, and designs the long limit of shedder perpendicular to circle of contact Measure Channel, compared with circular path, the flow field in space, shedder both sides evenly, the interference of tube wall stream field is less, improves the stability that whirlpool is separated.
Description
Technical field
The utility model relates to a kind of double diameter-changeable measuring tube of vortex shedding flow meter.
Background technology
Flux of vortex street is the flow instrument of a kind of test fluid concussion that meter is made according to " Karman vortex street " principle.When an insertion section is the cylinder of blunt form in the fluid flowed, the staggered whirlpool of two row can be produced in both sides, cylinder rear portion; The cross frequence f of whirlpool is directly proportional to post effluent speed V, is inversely proportional to cylinder width d.Just flow velocity and the instantaneous delivery of fluid can be measured by the cross frequence measuring whirlpool, therefore vortex shedding flow meter is as a kind of velocity-type instrument, be current one of main flow instrument product in the world, be widely used in industrial sector, urban construction and the environment-friendly engineerings such as oil, chemical industry, metallurgy.
Current domestic and international well-known flowmeter manufacturer mainly concentrates on the vortex shedding flow meter producing DN15 ~ 250 bore, caliber is less, instrument manufacture difficulty strengthens, the contradiction of the structure of instrument, the volume of detecting element and sensitivity shows especially, and the technology such as measuring accuracy, repeatability of instrument is difficult to reach requirement.In the process pipe of many enterprises, the actual flow or the flow velocity that there is fluid are in a large number on the low side, or pipe diameter is too small, and (pipe diameter is as DN15, DN10, DN8, even less) phenomenon, as industries such as fine chemistry industry, bio-pharmaceuticals, automobiles air flowmeter, along with science and technology and the development produced, market gets more and more to the detection demand of tiny flow quantity.
Problem less than normal for pipe diameter or pipe flow speed is on the low side, necked vortex-shedding meter effectively can solve actual flow measurement problem; While client provides suited instrumentation, can measuring accuracy be ensured again, expand the usable range of vortex shedding flow meter.
Summary of the invention
In view of the deficiency that prior art exists, the utility model provides a kind of double diameter-changeable measuring tube of vortex shedding flow meter, can be used for measuring the flow of small pipeline, low flow velocity, in the accuracy ensureing to measure and repeatability basis, improve the shock resistance of vortex shedding flow meter and enlarge measurement range.
Utility model for achieving the above object, the technical scheme taked is: a kind of double diameter-changeable measuring tube of vortex shedding flow meter, comprise flange, measuring tube, it is characterized in that: also comprise two contracting reducer pipe, shedder, one end of two described pair of contracting reducer pipes is inserted in a flange hole fixing respectively; The other end of two two contracting reducer pipes inserts the two ends mouth of pipe internal fixtion of measuring tube respectively; Described shedder is inserted in triangle through hole that the upper and lower tube wall of measuring tube is arranged with, shedder two ends respectively with measuring tube upper and lower tube wall fix.
The beneficial effects of the utility model are: this use is novel for the cylinder measuring tube of prior art, pipe design twice contraction, special fluid passage can make the stable separation of whirlpool, the hydraucone of inlet end shrinks steady flow condition, the ellipticity of endpiece is shunk, the fluid passage of circle is shrunk to circle of contact path, and design the long limit of shedder perpendicular to circle of contact Measure Channel, compared with circular path, the flow field in space, shedder both sides evenly, the interference of tube wall stream field is less, improves the stability that whirlpool is separated.
According to the flow parameter that client provides, provide necked vortex-shedding meter directly to client, a difficult problem for client's Small flowrate measurement can be solved, the prestige of enterprise can be improved again.So necking down type vortex shedding flow meter is that a kind of doulbe-sides' victory of the best is selected.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the structural representation of of the present utility model pair of contracting reducer pipe;
Fig. 3 is the side view of of the present utility model pair of contracting reducer pipe;
Fig. 4 is the structural representation of measuring tube of the present utility model;
Fig. 5 is the vertical view of measuring tube of the present utility model;
Fig. 6 is the side view of measuring tube of the present utility model;
Fig. 7 is the stereographic map of shedder of the present utility model.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail:
See shown in Fig. 1 to Fig. 7, a kind of double diameter-changeable measuring tube of vortex shedding flow meter, comprises flange 1, measuring tube 4, also comprises two contracting reducer pipe 2, shedder 3.
Two contracting reducer pipe 2 outer wall two ends are male half coupling 2-1, are conical surface 2-2 between two male half coupling 2-1, and the entrance of two contracting reducer pipe 2 is hydraucone 2-3 shape, exports as ellipticity 2-4, for the taper circle of contact shrinks between entrance and exit.
The entrance of two contracting reducer pipe 2 is hydraucone 2-3 shape, exports as ellipticity 2-4, and the design of shrinking for the taper circle of contact between entrance and exit can reduce flow field resistance; The conical surface 2-5 of two contracting reducer pipe 2 outer wall designs, and while guarantee carrying pipe pressure, can reduce table body weight, be convenient to welding.
Measuring tube 4 two-port is recessed seam 4-1, and the pore in two recessed seam 4-1 is elliptical aperture 4-4, and the tube wall of measuring tube 4 is respectively equipped with probe hole 4-2 and the triangle through hole 4-3 communicated with corresponding tube wall.Measuring tube 4 two-port is the design of recessed seam 4-1, can ensure that connection is fastening.The two contracting reducer pipe 2 ellipticity 2-4 of elliptical aperture 4-4 of measuring tube 4 is corresponding.
The cross section of shedder 3, one end is trigone 3-1, and the other end is cambered surface 3-2, is plane 3-3 between trigone 3-1 and cambered surface 3-2.The concrete shape of triangle through hole 4-3 is identical with the cross sectional shape of trigone 3-1.
The male half coupling 2-1 of two two contracting reducer pipe 2 one end is inserted in flange 1 hole respectively and is welded and fixed,
The male half coupling 2-1 of two two contracting reducer pipe 2 other ends is inserted respectively in the recessed seam 4-1 in the mouth of pipe of measuring tube 4 two ends and be welded and fixed, shedder 3 inserted in triangle through hole 4-3 that measuring tube about 4 tube wall is arranged with, shedder 3 two ends are welded and fixed with measuring tube about 4 tube wall respectively.
During use, the fluid of pipeline is through the loudspeaker face of two contracting reducer pipe 2 inlet horn 2-3 shape constricted arc for the first time, steady flow condition, taper circle of contact contraction front second time taper between two contracting reducer pipe 2 entrance and exit is shunk, prepare for exciting stronger energy, enter measuring tube 4 finally by ellipticity 2-4 outlet, elliptical aperture 4-4 fully develops two row staggered strong and stable whirlpools flowers, guarantees the shock resistance of vortex shedding flow meter in small-bore pipeline field and measuring accuracy.
Claims (4)
1. the double diameter-changeable measuring tube of a vortex shedding flow meter, comprise flange (1), measuring tube (4), it is characterized in that: also comprise two contracting reducer pipe (2), shedder (3), one end of two described pair contracting reducer pipe (2) is inserted in flange (1) hole fixing respectively; The other end of two two contracting reducer pipes (2) inserts the two ends mouth of pipe internal fixtion of measuring tube (4) respectively; Described shedder (3) is inserted in the triangle through hole (4-3) that measuring tube (4) up and down tube wall is arranged with, shedder (3) two ends respectively with measuring tube (4) up and down tube wall fix.
2. the double diameter-changeable measuring tube of a kind of vortex shedding flow meter according to claim 1, it is characterized in that: described pair of contracting reducer pipe (2) outer wall two ends are male half coupling (2-1), be the conical surface (2-2) between two male half couplings (2-1), the entrance of two contracting reducer pipe (2) is hydraucone (2-3) shape, outlet is ellipticity (2-4), for the taper circle of contact shrinks between entrance and exit.
3. the double diameter-changeable measuring tube of a kind of vortex shedding flow meter according to claim 1, it is characterized in that: described measuring tube (4) two-port is recessed seam (4-1), pore in two recessed seams (4-1) is elliptical aperture (4-4), and the tube wall of measuring tube (4) is respectively equipped with a through hole (4-2) and a triangle through hole communicated with corresponding tube wall (4-3).
4. the double diameter-changeable measuring tube of a kind of vortex shedding flow meter according to claim 1, it is characterized in that: the cross section of described shedder (3), one end is trigone (3-1), and the other end is cambered surface (3-2), is plane (3-3) between trigone (3-1) and cambered surface (3-2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420691020.3U CN204330032U (en) | 2014-11-18 | 2014-11-18 | A kind of double diameter-changeable measuring tube of vortex shedding flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420691020.3U CN204330032U (en) | 2014-11-18 | 2014-11-18 | A kind of double diameter-changeable measuring tube of vortex shedding flow meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204330032U true CN204330032U (en) | 2015-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420691020.3U Active CN204330032U (en) | 2014-11-18 | 2014-11-18 | A kind of double diameter-changeable measuring tube of vortex shedding flow meter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022268330A1 (en) * | 2021-06-24 | 2022-12-29 | SIKA Dr. Siebert & Kühn GmbH & Co. KG | Flowmeter |
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2014
- 2014-11-18 CN CN201420691020.3U patent/CN204330032U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022268330A1 (en) * | 2021-06-24 | 2022-12-29 | SIKA Dr. Siebert & Kühn GmbH & Co. KG | Flowmeter |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |