CN201653459U - Vortex flowmeter - Google Patents
Vortex flowmeter Download PDFInfo
- Publication number
- CN201653459U CN201653459U CN2009202982447U CN200920298244U CN201653459U CN 201653459 U CN201653459 U CN 201653459U CN 2009202982447 U CN2009202982447 U CN 2009202982447U CN 200920298244 U CN200920298244 U CN 200920298244U CN 201653459 U CN201653459 U CN 201653459U
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- vortex
- axis
- flow meter
- vortex shedding
- platinum filament
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Abstract
The utility model relates to a vortex flowmeter, which comprises a medium circulating pipeline. A vertex generator is arranged on the axis of the medium circulating pipeline, the pipeline wall of the medium circulating pipeline corresponding to the vortex generator is provided with a pair of pressure tapping holes symmetric to the axis of the medium circulating pipeline, the two pressure tapping holes are connected via a detection passage with a symmetric structure, a detecting element is arranged at the center of the detection passage, and the detecting element adopts a thermo-sensitive element. The vortex flowmeter has high detection sensitivity and fine vibration resistance and pollution resistibility.
Description
Technical field
The utility model relates to a kind of vortex shedding flow meter.
Background technology
Vortex shedding flow meter utilizes the Karman vortex street principle to carry out flow measurement.A non-streamline bluff body is vertically inserted in the pipeline, walk around bluff body and flow along with fluid, produce the vortex segregation phenomenon, form well-regulated vortex row, the sense of rotation of left and right sides vortex is opposite, and as Fig. 1, this vortex is called Karman vortex street.Research according to toll bar, these vortex row majorities are unsettled, the two row whirlpools of having only the inward turning that formation replaces mutually, and when the ratio of the spacing L of two vortexs that vortex row width H is adjacent with same column satisfies H/L=0.281 (to cylindrical vortex generation body), such vortex row is only stable, claims Karman vortex street.The bluff body that produces the vortex separation is called vortex generation body.Vortex shedding flow meter is to break away from the frequency of vortex generation body and the instrument that the relation between the flow is measured flow according to vortex.
Detecting the vortex shedding frequency around the vortex generation body of vortex shedding flow meter with the temperature-sensitive detection technique, is the detection vortex method that grows up the earliest, and it has the advantage of firm, highly sensitive and good anti-vibration simple in structure.Its major defect is that durability against pollution is poor, and can only be used to detect the fluid of lower temperature.Just because of these problems, the vortex shedding flow meter of practical application mostly adopts pressure-sensitive detection technique.Yet pressure-sensitive method also has sensitivity lower, shock sensive problem.So the former strong point just is the latter's a weakness, the latter's strong point is the former weakness again.Desirable method is that both are organically combined, and makes it simple in structure firm, has higher sensitivity that good resistance to shock and durability against pollution are arranged again.
The utility model content
The purpose of this utility model provides a kind of vortex shedding flow meter, to realize taking into account of detection sensitivity, vibration resistance ability and durability against pollution.
For achieving the above object, the technical scheme that adopts is: a kind of vortex shedding flow meter, comprise that MEDIA FLOW is threaded a pipe, MEDIA FLOW is threaded a pipe, and axis is provided with eddy generator, offer a pair of on the duct wall that the MEDIA FLOW corresponding with eddy generator threaded a pipe about the thread a pipe pressure port of axis symmetry of MEDIA FLOW, two pressure ports link to each other by the sense channel of a structural symmetry, centre at sense channel is provided with detecting element, and described detecting element is a thermal sensing element.
Offer the aperture of at least one anti-resonance on the described sense channel.
Described thermal sensing element is a platinum filament.
Described platinum filament is crossed the axis that detects pipeline, and with the axis normal that detects pipeline.
Described platinum filament is on the plane of the axis normal of measuring tube axis and two pressure ports.
The utility model is provided with thermal sensing element in the centre of sense channel, flow through at fluid and to have gettering effect when the both sides of vortex generation body replace isolated vortex through pressure tappings, so the pressure fluctuation that forms is conducted in conduit with the form of compressional wave, the hot type detecting element is in the effect of recommending down, there is gas to shake back and forth perpendicular to the hot type detecting element, the resistance generation alternate of the hot type detecting element that is heated, and then hot type detecting element resistance variations frequency equals vortex shedding frequency in the vortex shedding flow meter, thereby realized detection sensitivity, taking into account of resistance to shock and durability against pollution; Offer the aperture of at least one anti-resonance on the sense channel, avoided forming in the testing process interference that resonance causes; Platinum filament is crossed the axis that detects pipeline, and with the axis normal that detects pipeline, help more that gas promotes the hot type detecting element in the conduit; Platinum filament has increased the accuracy that detects on the plane of the axis normal of measuring tube axis and two pressure ports.
Description of drawings
Fig. 1 is the Karman vortex street synoptic diagram;
Fig. 2 is the utility model structural representation.
Embodiment
As shown in Figure 2, present embodiment comprises the measuring tube 1 of threading a pipe as MEDIA FLOW, eddy generator 2 and signal processing circuit 6, offer a pair of pressure port 3 on the tube wall of the measuring tube 1 of eddy generator 2 correspondences about measuring tube conduit axis symmetry, two pressure ports 3 link to each other by the conduit 4 as sense channel of a structural symmetry, conduit 4 is about the planar structure symmetry of the axis normal of measuring tube axis and two pressure ports, be provided with platinum filament 5 in the conduit 4 as the hot type detecting element, the signal output of platinum filament 5 is connected with signal processing circuit 6, platinum filament 5 is perpendicular to the axis setting of conduit, and on the plane of the axis normal of the axis of measuring tube 1 and two pressure ports 3, conduit 4 is provided with an aperture.
In the back, both sides of vortex generation body, can alternately isolate vortex and promptly form vortex street when fluid is flowed through the measuring tube of flowmeter.The vortex core is a low-pressure area, has gettering effect during its process conduit mouth, so form pressure fluctuation, pressure fluctuation is conducted in conduit with the compressional wave form, and its essence is exactly the propagation of sound wave in pipe.If detected in the contradiction that then can be absorbed in resistance to shock and sensitivity with acoustic sensor.The platinum filament 5 that adopts a heating in the present embodiment is as in the conduit, and platinum filament 5 is in the effect of recommending down, has gas to vibrate back and forth perpendicular to platinum filament 5, the resistance generation alternate of the platinum filament 5 that is heated.Platinum filament resistance variations frequency equals vortex shedding frequency in the vortex shedding flow meter, has realized coming the detected pressures pulsation with thermal sensing element agency pressure-sensitive (or sound is quick) element.
In the communication process, the rapid variation that runs into acoustic impedance can produce reflection to sound wave in conduit, and the back reflective that comes in conduit promptly is resonance.The resonance signal amplitude greatly to the vortex signal amplitude near the time will have a strong impact on the detection of vortex signal.If the structure of conduit is strict symmetry, and owing to have identical interference at two duct entry places, the undesired signal that then resonates can be offset at platinum filament 5 places, obtains normal vortex signal.Therefore but the complete symmetry of structure is not allow facilely, will manage not form resonance, and present embodiment adopts to be offered an aperture ground method and realize on conduit.Certainly in the product of reality, the conduit path itself has leakage sometimes, so also can prevent the generation of resonating, but principle is with to offer aperture the same.
Vortex generation body in the present embodiment is a prismatoid, also can make other shapes certainly, and as triangle body etc., why shape and utility model point of the present utility model are irrelevant for it, and selection herein is only for better saying something.
Claims (5)
1. vortex shedding flow meter, comprise that MEDIA FLOW is threaded a pipe, MEDIA FLOW is threaded a pipe, and axis is provided with eddy generator, offer a pair of on the duct wall that the MEDIA FLOW corresponding with eddy generator threaded a pipe about the thread a pipe pressure port of axis symmetry of MEDIA FLOW, two pressure ports link to each other by the sense channel of a structural symmetry, centre at sense channel is provided with detecting element, it is characterized in that described detecting element is a thermal sensing element.
2. vortex shedding flow meter as claimed in claim 1 is characterized in that, offers the aperture of at least one anti-resonance on the described sense channel.
3. vortex shedding flow meter as claimed in claim 1 or 2 is characterized in that, described thermal sensing element is a platinum filament.
4. vortex shedding flow meter as claimed in claim 3 is characterized in that, described platinum filament is crossed the axis that detects pipeline, and with the axis normal that detects pipeline.
5. vortex shedding flow meter as claimed in claim 4 is characterized in that, described platinum filament is on the plane of the axis normal of measuring tube axis and two pressure ports.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202982447U CN201653459U (en) | 2009-12-30 | 2009-12-30 | Vortex flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202982447U CN201653459U (en) | 2009-12-30 | 2009-12-30 | Vortex flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201653459U true CN201653459U (en) | 2010-11-24 |
Family
ID=43118701
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202982447U Expired - Lifetime CN201653459U (en) | 2009-12-30 | 2009-12-30 | Vortex flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201653459U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111649790A (en) * | 2020-06-13 | 2020-09-11 | 江苏华海测控技术有限公司 | Antidetonation type digit vortex flowmeter |
-
2009
- 2009-12-30 CN CN2009202982447U patent/CN201653459U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111649790A (en) * | 2020-06-13 | 2020-09-11 | 江苏华海测控技术有限公司 | Antidetonation type digit vortex flowmeter |
| CN111649790B (en) * | 2020-06-13 | 2022-01-21 | 江苏华海测控技术有限公司 | Antidetonation type digit vortex flowmeter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: ZHEZHOU GUANGLI SCIENCE + TECHNOLOGY CO., LTD. Free format text: FORMER NAME: GUANGLI SCIENCE + TECHNOLOGY DEVELOPMENT CO., LTD., ZHENGZHOU |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 450001 No. 58, Ruida Road, hi tech Industrial Development Zone, Henan, Zhengzhou Patentee after: Zhengzhou GL Tech Company Address before: 450001 No. 58, Ruida Road, hi tech Industrial Development Zone, Henan, Zhengzhou Patentee before: Guangli Science & Technology Development Co., Ltd., Zhengzhou |
|
| C56 | Change in the name or address of the patentee | ||
| CP02 | Change in the address of a patent holder |
Address after: 450001 Henan city of Zhengzhou province high tech Industrial Development Zone Long Chun Road No. 10 Patentee after: Zhengzhou GL Tech Company Address before: 450001 No. 58, Ruida Road, hi tech Industrial Development Zone, Henan, Zhengzhou Patentee before: Zhengzhou GL Tech Company |
|
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 450001 Henan city of Zhengzhou province high tech Industrial Development Zone Long Chun Road No. 10 Patentee after: Power Polytron Technologies Inc Address before: 450001 Henan city of Zhengzhou province high tech Industrial Development Zone Long Chun Road No. 10 Patentee before: Zhengzhou GL Tech Company |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20101124 |