CN2821533Y - Flow saving stable flow type vortex street flowmeter - Google Patents
Flow saving stable flow type vortex street flowmeter Download PDFInfo
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- CN2821533Y CN2821533Y CN 200520107291 CN200520107291U CN2821533Y CN 2821533 Y CN2821533 Y CN 2821533Y CN 200520107291 CN200520107291 CN 200520107291 CN 200520107291 U CN200520107291 U CN 200520107291U CN 2821533 Y CN2821533 Y CN 2821533Y
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Abstract
The utility model elates to a flow-saving flow-stabilizing type vortex street flowmeter for measuring fluid flow in a large-diameter pipeline and capable of changing measuring range. The utility model comprises a vortex street signal generating body (1) and a signal transducer (6); the central position of a flowmeter cavity is provided with a throttling element (3) which is of a cylinder shape, and the stream attacking surface of the throttling element is of a streamline structure; an annular space between the throttling element (3) and the flowmeter cavity is provided with partition boards (2, 8) or a choking partition board (9) for choking flow; the partition boards form a measurement cavity and a circulation cavity with same circulation surfaces; the inner part of the measurement cavity is provided with a vortex street signal generating body (1) and a signal transducer (6); the central line of the measurement cavity on the circumference of the annular space and the central line of the choking partition board are arranged in the angles with the same center of circle. The flowmeter has the characteristics of convenience for installation, regulation and use, small pressure loss, energy saving and exact measuring, and is suitable for measuring the flow in the large-diameter fluid pipeline.
Description
Technical field
The utility model relates to a kind of flow measurement instrument that is used to measure liquid, gas or steam flow in the closed conduct, more particularly, relates to a kind of heavy caliber variable measurement scope throttling stable flow type vortex shedding flow meter.
Background technology
Vortex shedding flow meter is a kind of velocity survey formula flow measurement instrument.Its basic functional principle is as follows: the bluff body of placing (or many) fluoran stream surface blunt form in the pipeline of flow media, then the separation that can replace in the bluff body both sides during media flow discharges the whirlpool signal of the rule that two strings alternately produce, in certain flow range the whirlpool cross frequence become than with the mean flow rate of pipeline internal medium.The frequency (or count signal pulse) of measuring the whirlpool signal just can record the flow of medium in the pipeline.Because this flowmeter has suitable type of fluid many (suitable gas, liquid, steam etc.), simple in structure, non mechanical movable, good reliability, degree of accuracy is higher, rangeability is wide, crushing is little, the pulse signal that output is directly proportional with flow, the drift of signal inferred-zero, and output signal is not subjected to the advantages such as influence of medium physical parameter (density, viscosity etc.) in certain reynolds number range, therefore this flowmeter more and more is subjected to user's welcome, and the use field is also in continuous expansion.
The use the very important point of vortex shedding flow meter is correctly selected corresponding measurement range instrument for use according to pipeline actual flow scope exactly, to realize the normal measurement of flow.Because the uncertainty of technological parameter, for example, the uncertainty of new equipment parameter, the uncertainty of capacity loading and to the uncertainty of following load prediction etc., this sometimes selection is very difficult.Inappropriate selection tends to bring the undesired of instrument operation, and the measurement of rate-of flow can't normally be carried out.Run into this situation under the normal condition and generally will reselect Instrumentation Requirement (bore), install again to satisfy measurement requirement.And the work of this replacing instrument has implemented many difficulties, and the pipeline that will quite grow the instrument front and back simultaneously contracts, hole enlargement is installed and handled because reinstall.The patent No. is that the Chinese utility model patent of ZL02242863.1 discloses a kind of throttling stable flow type vortex shedding flow meter, is used for addressing the above problem.But this patent structure is applicable to that mainly osculum is through instrument.On instrument, realize relatively difficulty at big mouthful, because it needs enough table body lengths.
In addition, in general the signal frequency of vortex shedding flow meter is proportional to velocity of medium, is inversely proportional to the width of vortex signal generation body.Through a large amount of tests, separate in order to stablize vortex signal, the general in the world vortex signal generation body fluoran stream surface width that adopts is generally the 20-30% of instrument bore.Like this, large caliber vortex shedding flowmeter has just had distinct issues, is exactly that signal frequency is lower, and coefficient of flow is smaller.The problem of bringing is that Measurement Resolution is lower.Therefore it is generally acknowledged to be not suitable for making and use large caliber vortex shedding flowmeter (generally not making the above vortex shedding flow meter of 300mm bore in the world), the use of large caliber vortex shedding flowmeter is restricted.
Summary of the invention
The utility model is at the problems referred to above, a kind of variable restrictor area formula throttling stable flow type vortex shedding flow meter of complete new structure is provided, solved not malleable and at present the large caliber vortex shedding flowmeter signal frequency is low, the problem that the Measurement Resolution that coefficient of flow brings for a short time is lower of above-mentioned instrument scope.
In order to address the above problem, the utility model is constructed a kind of throttling stable flow type vortex shedding flow meter, comprises vortex signal generation body 1 and signal transducer 6; Be provided with throttling element 3 in the center of flowmeter cavity; Described throttling element 3 is a streamlined structure for cylindrical and fluoran stream surface; Annular space between described throttling element 3 and the described flowmeter cavity is provided with dividing plate 2,8 or is used for the restricted baffle 9 of choked flow, has formed between the described dividing plate to measure cavity and the identical circulation cavity of circulating face; In described measurement cavity, be provided with described vortex signal generation body 1 and described signal transducer 6; The above measures center of circle angles settings such as the center line of cavity and the center line of described restricted baffle the circumference of described annular space.
This throttling stable flow type vortex shedding flow meter, it further improves and is that the streamlined fluoran stream surface of throttling element 3 is sphere or ellipsoid or conical surface transition structure.
This throttling stable flow type vortex shedding flow meter, it further improves and is that throttling element is the cavity structure that the rear end is provided with end cap; Described end cap is provided with equalizing port 4.
By technique scheme, throttling stable flow type vortex shedding flow meter of the present utility model is applicable in the heavy caliber instrument, compares with this type of vortex shedding flow meter of tradition to have following characteristics:
(1) can recently change the suitable range of instrument by changing throttling.Can make things convenient for the user to select for use, use instead.Even might realize selecting corresponding instrument by caliber.This installation to instrument, use and to bring greats convenience (need not contract, expander handle), especially the installation of instrument by the road brings great convenience to big mouth, and can save a large amount of erected costs.
(2) signal frequency of instrument increases, and signal resolution will be significantly improved.The throttle type vortex shedding flow meter 200mm bore of design is a lowest calibre.200mm bore vortex shedding flow meter is had under the condition of identical useful area than (the useful area ratio of general vortex shedding flow meter is approximately 64%) with the traditional structure vortex shedding flow meter, signal resolution will improve 3 times at least, and more bigbore vortex shedding flow meter resolution will have bigger raising.This improvement to the large caliber vortex shedding flowmeter signal resolution is significant, also can bring fundamental change through promoting the use of of vortex shedding flow meter to big mouthful.
(3) built-in streamlined throttling element convection cell has rectified action, simultaneously by the method for dual sensor or multisensor measurement, can solve the accurate measurement of the fluid flow of velocity flow profile inequality fortune in the pipeline.The realization of this measure can reduce the length requirement of the preceding straight length of table, and is great to the application value of some special occasions.
(4) because throttling element has adopted streamlined structure, therefore under the condition of same throttling ratio, the pressure loss is littler than the traditional structure, has energy-saving significance.
(5) the verification scaling method does not change, and dispatching from the factory, it is easy to demarcate.
(6), bring convenience making debugging because signal amplifies the specification unanimity (the vortex shedder basic width of the vortex shedding flow meter of different size bore is the same) of plate.
Description of drawings
Fig. 1 is the structural representation of a kind of embodiment of the utility model throttling stable flow type vortex shedding flow meter;
Fig. 2 is that the A-A of throttling stable flow type vortex shedding flow meter among Fig. 1 is to cut-open view;
Fig. 3 is the structural representation of second kind of embodiment of the utility model throttling stable flow type vortex shedding flow meter;
Fig. 4 is the cut-open view of throttling stable flow type vortex shedding flow meter among Fig. 3;
Fig. 5 is the structural representation of the third embodiment of the utility model throttling stable flow type vortex shedding flow meter;
Fig. 6 is the structural representation of the 4th kind of embodiment of the utility model throttling stable flow type vortex shedding flow meter;
Fig. 7 is the structural representation of the 5th kind of embodiment of the utility model throttling stable flow type vortex shedding flow meter;
Fig. 8 is the structural representation of the 4th kind of embodiment of the utility model throttling stable flow type vortex shedding flow meter;
Fig. 9 is a kind of example structure synoptic diagram of this throttling stable flow type vortex shedding flow meter throttling element fluoran stream surface;
Figure 10 is second kind of example structure synoptic diagram of this throttling stable flow type vortex shedding flow meter throttling element fluoran stream surface;
Figure 11 is the third example structure synoptic diagram of this throttling stable flow type vortex shedding flow meter throttling element fluoran stream surface.
Embodiment
The utility model throttling stable flow type vortex shedding flow meter is provided with the cylindrical throttling element 3 that fluoran stream surface is a streamlined structure in measurement inside cavity center; Throttling element 3 forms annular space with flowmeter instrument inner chamber.Annular space is separated into the circulation cavity and measures cavity with dividing plate 2,8 or restricted baffle 9.In measuring cavity, be provided with vortex signal generation body 1 and signal transducer 6.The effect that aforementioned barriers plays rectification, current stabilization simultaneously and supports throttling element; Form between the wherein adjacent dividing plate 2 and measure the chamber; Dividing plate 8 is used to form the circulation cavity; And the thickness of dividing plate 9 is different with dividing plate 8 with dividing plate 2, and the corresponding vortex signal generation of its purposes body 1 plays the effect of choked flow.In addition, the circulating face shape of each circulation cavity is identical; And center line center of circle angle intervals setting to equate on the circumference of annular space of measuring the center line and the restricted baffle 9 of cavity, the number of above-mentioned measurement cavity is provided with as required.
Because the structure of flowing lumen is equivalent to small-bore vortex shedding flow meter, therefore the width of the vortex signal generation body of placing 1 is than with little many of the vortex signal generation body width of bore vortex shedding flow meter, and do not destroy the stability of Signal Separation; By the measurement flow rate of fluid, and then the measurement of realization fluid flow.
In addition, throttling element is the cavity structure that the rear end is provided with end cap; End cap is provided with equalizing port 4, is used for equilibrium temperature and pressure, and promptly when fluid passed through throttling element 3, fluid can enter in the cavity of throttling element by equalizing port 4, makes the external and internal pressure temperature balance.
As shown in Figure 1, be divided into two flowing lumens up and down by dividing plate 8 in instrument 5 bodies; The measurement cavity that in the cavity on top, utilizes dividing plate 2 to form; In measuring cavity, vortex signal generation body and signal transducer are set; Dividing plate 9 plays the effect of choked flow corresponding to the vortex signal generation body in the measurement cavity.Fig. 2 has provided the AA of Fig. 1 to cut-open view.The throttling bodies surface is a sphere among the figure, also can adopt other forms of streamlined structure, for example bullet shape or the like.
And Fig. 3 has provided another kind of example structure, is different from Fig. 1 part and is, two circulations up and down of formation are provided with vortex signal generation body and signal transducer respectively in the cavitys in measuring chamber.Cut-open view among Fig. 4, also corresponding tables shows the position of vortex signal generation body and signal transducer, and the setting of balance port is also slightly different with Fig. 2 in addition.The form of balance port is provided with as required and gets final product.
Fig. 5 has provided a kind of three circulation cavitys that have, and the structural representation that vortex signal generation body and signal transducer are set in three measurement cavitys.Fig. 6 has provided four circulation cavitys, and the structural representation that vortex signal generation body and signal transducer are set in the four measuring cavity.Fig. 7 embodiment median septum 8 both had been used to form the circulation cavity, played the effect of restricted baffle again.And among Fig. 8 embodiment, dividing plate 2 is used to form the measurement cavity; Dividing plate 8 is used to form the circulation cavity; Dividing plate 9 plays the effect of restricted baffle.
The quantity of flowing lumen can be above-mentioned two, three or four, also can be six or more.Because several flowing lumens are made into symmetrical structure fully, therefore at the flow velocity of medium under the full-blown condition of flow velocity and in the whole pipeline of representative that can be correct in certain pipeline reynolds number range, and then the accurate flow of medium in the measuring channel.The velocity of medium of promptly measuring some flowing lumens wherein is the accurate rate of flow of fluid of measuring channel just, and then accurate measuring channel rate-of flow.
But equally with other velocity flowmeters need to guarantee essential flow development length before and after the instrument.Under the uncertain condition of the uniformity coefficient of velocity flow profile, for example flow development length long enough not before the flowmeter does not satisfy requirement, at this moment the multiple spot fluid-velocity survey can be set, and get its average signal, and then guarantee the accurate measurement of whole pipeline rate-of flow.
Change the diameter of throttling element in the table or the fluoran stream surface long-pending (this moment, the dividing plate fluoran stream surface was fairshaped) of change dividing plate in addition, can change the useful area ratio of flowmeter, and then change flow measurement range.The streamlined fluoran stream surface of throttling element 3 can adopt sphere or ellipsoid or conical surface transition structure; The spherical fluoran stream surface structure of semicircle as shown in Figure 9, bullet-shaped fluoran stream surface structure shown in Figure 10, and cone shape fluoran stream surface structure shown in Figure 11.
And the width of the vortex signal generation body that is provided with in the flowing lumen is less than the width of the vortex signal generation body of the same bore vortex shedding flow meter of traditional structure.Promptly, be provided with in the flowing lumen generation body narrower than the vortex signal generation body of standard vortex shedding flow meter (with the vortex signal generation body of suitable bore standard vortex shedding flow meter relatively), thereby obviously improve with traditional structure vortex shedding flow meter ratioing signal resolution with bore.
The above; it only is the preferable embodiment of the utility model; but protection domain of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; be equal to replacement or change according to the technical solution of the utility model and inventive concept thereof, all should be encompassed within the protection domain of the present utility model.
Claims (3)
1, a kind of throttling stable flow type vortex shedding flow meter comprises vortex signal generation body (1) and signal transducer (6); It is characterized in that, be provided with throttling element (3) in the center of described flowmeter cavity; Described throttling element (3) is a streamlined structure for cylindrical and fluoran stream surface; Annular space between described throttling element (3) and the described flowmeter cavity is provided with dividing plate (2,8) or is used for the restricted baffle (9) of choked flow, has formed between the described dividing plate to measure cavity and the identical circulation cavity of circulating face; In described measurement cavity, be provided with described vortex signal generation body (1) and described signal transducer (6); The above measures center of circle angles settings such as the center line of cavity and the center line of described restricted baffle the circumference of described annular space.
According to the described throttling stable flow type of claim 1 vortex shedding flow meter, it is characterized in that 2, the streamlined fluoran stream surface of described throttling element (3) is sphere or ellipsoid or conical surface transition structure.
According to the described throttling stable flow type of claim 1 vortex shedding flow meter, it is characterized in that 3, described throttling element is the cavity structure that the rear end is provided with end cap; Described end cap is provided with equalizing port (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520107291 CN2821533Y (en) | 2005-09-23 | 2005-09-23 | Flow saving stable flow type vortex street flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520107291 CN2821533Y (en) | 2005-09-23 | 2005-09-23 | Flow saving stable flow type vortex street flowmeter |
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| CN2821533Y true CN2821533Y (en) | 2006-09-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520107291 Expired - Fee Related CN2821533Y (en) | 2005-09-23 | 2005-09-23 | Flow saving stable flow type vortex street flowmeter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102445243A (en) * | 2011-11-08 | 2012-05-09 | 云南大学 | Flow-measuring device with flow stabilizing function |
| CN102928028A (en) * | 2012-10-31 | 2013-02-13 | 浙江省计量科学研究院 | Full-symmetry double-cone flowmeter |
| CN102928027A (en) * | 2012-10-27 | 2013-02-13 | 江阴市神州测控设备有限公司 | Adjustable flow meter |
| CN108709593A (en) * | 2018-05-18 | 2018-10-26 | 金卡智能集团股份有限公司 | A kind of annular flux of vortex street metering device, flowmeter and its flow-measuring method |
-
2005
- 2005-09-23 CN CN 200520107291 patent/CN2821533Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102445243A (en) * | 2011-11-08 | 2012-05-09 | 云南大学 | Flow-measuring device with flow stabilizing function |
| CN102445243B (en) * | 2011-11-08 | 2012-11-21 | 云南大学 | Flow-measuring device with flow stabilizing function |
| CN102928027A (en) * | 2012-10-27 | 2013-02-13 | 江阴市神州测控设备有限公司 | Adjustable flow meter |
| CN102928028A (en) * | 2012-10-31 | 2013-02-13 | 浙江省计量科学研究院 | Full-symmetry double-cone flowmeter |
| CN108709593A (en) * | 2018-05-18 | 2018-10-26 | 金卡智能集团股份有限公司 | A kind of annular flux of vortex street metering device, flowmeter and its flow-measuring method |
| CN108709593B (en) * | 2018-05-18 | 2024-04-12 | 金卡智能集团股份有限公司 | Annular vortex street flow metering device, flowmeter and flow measuring method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |